1 /*
2  * Core routines and tables shareable across OS platforms.
3  *
4  * Copyright (c) 1994-2002 Justin T. Gibbs.
5  * Copyright (c) 2000-2002 Adaptec Inc.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions, and the following disclaimer,
13  *    without modification.
14  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
15  *    substantially similar to the "NO WARRANTY" disclaimer below
16  *    ("Disclaimer") and any redistribution must be conditioned upon
17  *    including a substantially similar Disclaimer requirement for further
18  *    binary redistribution.
19  * 3. Neither the names of the above-listed copyright holders nor the names
20  *    of any contributors may be used to endorse or promote products derived
21  *    from this software without specific prior written permission.
22  *
23  * Alternatively, this software may be distributed under the terms of the
24  * GNU General Public License ("GPL") version 2 as published by the Free
25  * Software Foundation.
26  *
27  * NO WARRANTY
28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
36  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
37  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38  * POSSIBILITY OF SUCH DAMAGES.
39  *
40  * $Id: //depot/aic7xxx/aic7xxx/aic7xxx.c#155 $
41  */
42 
43 #include "aic7xxx_osm.h"
44 #include "aic7xxx_inline.h"
45 #include "aicasm/aicasm_insformat.h"
46 
47 /***************************** Lookup Tables **********************************/
48 static const char *const ahc_chip_names[] = {
49 	"NONE",
50 	"aic7770",
51 	"aic7850",
52 	"aic7855",
53 	"aic7859",
54 	"aic7860",
55 	"aic7870",
56 	"aic7880",
57 	"aic7895",
58 	"aic7895C",
59 	"aic7890/91",
60 	"aic7896/97",
61 	"aic7892",
62 	"aic7899"
63 };
64 
65 /*
66  * Hardware error codes.
67  */
68 struct ahc_hard_error_entry {
69 	uint8_t errno;
70 	const char *errmesg;
71 };
72 
73 static const struct ahc_hard_error_entry ahc_hard_errors[] = {
74 	{ ILLHADDR,	"Illegal Host Access" },
75 	{ ILLSADDR,	"Illegal Sequencer Address referenced" },
76 	{ ILLOPCODE,	"Illegal Opcode in sequencer program" },
77 	{ SQPARERR,	"Sequencer Parity Error" },
78 	{ DPARERR,	"Data-path Parity Error" },
79 	{ MPARERR,	"Scratch or SCB Memory Parity Error" },
80 	{ PCIERRSTAT,	"PCI Error detected" },
81 	{ CIOPARERR,	"CIOBUS Parity Error" },
82 };
83 static const u_int num_errors = ARRAY_SIZE(ahc_hard_errors);
84 
85 static const struct ahc_phase_table_entry ahc_phase_table[] =
86 {
87 	{ P_DATAOUT,	NOP,			"in Data-out phase"	},
88 	{ P_DATAIN,	INITIATOR_ERROR,	"in Data-in phase"	},
89 	{ P_DATAOUT_DT,	NOP,			"in DT Data-out phase"	},
90 	{ P_DATAIN_DT,	INITIATOR_ERROR,	"in DT Data-in phase"	},
91 	{ P_COMMAND,	NOP,			"in Command phase"	},
92 	{ P_MESGOUT,	NOP,			"in Message-out phase"	},
93 	{ P_STATUS,	INITIATOR_ERROR,	"in Status phase"	},
94 	{ P_MESGIN,	MSG_PARITY_ERROR,	"in Message-in phase"	},
95 	{ P_BUSFREE,	NOP,			"while idle"		},
96 	{ 0,		NOP,			"in unknown phase"	}
97 };
98 
99 /*
100  * In most cases we only wish to itterate over real phases, so
101  * exclude the last element from the count.
102  */
103 static const u_int num_phases = ARRAY_SIZE(ahc_phase_table) - 1;
104 
105 /*
106  * Valid SCSIRATE values.  (p. 3-17)
107  * Provides a mapping of tranfer periods in ns to the proper value to
108  * stick in the scsixfer reg.
109  */
110 static const struct ahc_syncrate ahc_syncrates[] =
111 {
112       /* ultra2    fast/ultra  period     rate */
113 	{ 0x42,      0x000,      9,      "80.0" },
114 	{ 0x03,      0x000,     10,      "40.0" },
115 	{ 0x04,      0x000,     11,      "33.0" },
116 	{ 0x05,      0x100,     12,      "20.0" },
117 	{ 0x06,      0x110,     15,      "16.0" },
118 	{ 0x07,      0x120,     18,      "13.4" },
119 	{ 0x08,      0x000,     25,      "10.0" },
120 	{ 0x19,      0x010,     31,      "8.0"  },
121 	{ 0x1a,      0x020,     37,      "6.67" },
122 	{ 0x1b,      0x030,     43,      "5.7"  },
123 	{ 0x1c,      0x040,     50,      "5.0"  },
124 	{ 0x00,      0x050,     56,      "4.4"  },
125 	{ 0x00,      0x060,     62,      "4.0"  },
126 	{ 0x00,      0x070,     68,      "3.6"  },
127 	{ 0x00,      0x000,      0,      NULL   }
128 };
129 
130 /* Our Sequencer Program */
131 #include "aic7xxx_seq.h"
132 
133 /**************************** Function Declarations ***************************/
134 static void		ahc_force_renegotiation(struct ahc_softc *ahc,
135 						struct ahc_devinfo *devinfo);
136 static struct ahc_tmode_tstate*
137 			ahc_alloc_tstate(struct ahc_softc *ahc,
138 					 u_int scsi_id, char channel);
139 #ifdef AHC_TARGET_MODE
140 static void		ahc_free_tstate(struct ahc_softc *ahc,
141 					u_int scsi_id, char channel, int force);
142 #endif
143 static const struct ahc_syncrate*
144 			ahc_devlimited_syncrate(struct ahc_softc *ahc,
145 						struct ahc_initiator_tinfo *,
146 						u_int *period,
147 						u_int *ppr_options,
148 						role_t role);
149 static void		ahc_update_pending_scbs(struct ahc_softc *ahc);
150 static void		ahc_fetch_devinfo(struct ahc_softc *ahc,
151 					  struct ahc_devinfo *devinfo);
152 static void		ahc_scb_devinfo(struct ahc_softc *ahc,
153 					struct ahc_devinfo *devinfo,
154 					struct scb *scb);
155 static void		ahc_assert_atn(struct ahc_softc *ahc);
156 static void		ahc_setup_initiator_msgout(struct ahc_softc *ahc,
157 						   struct ahc_devinfo *devinfo,
158 						   struct scb *scb);
159 static void		ahc_build_transfer_msg(struct ahc_softc *ahc,
160 					       struct ahc_devinfo *devinfo);
161 static void		ahc_construct_sdtr(struct ahc_softc *ahc,
162 					   struct ahc_devinfo *devinfo,
163 					   u_int period, u_int offset);
164 static void		ahc_construct_wdtr(struct ahc_softc *ahc,
165 					   struct ahc_devinfo *devinfo,
166 					   u_int bus_width);
167 static void		ahc_construct_ppr(struct ahc_softc *ahc,
168 					  struct ahc_devinfo *devinfo,
169 					  u_int period, u_int offset,
170 					  u_int bus_width, u_int ppr_options);
171 static void		ahc_clear_msg_state(struct ahc_softc *ahc);
172 static void		ahc_handle_proto_violation(struct ahc_softc *ahc);
173 static void		ahc_handle_message_phase(struct ahc_softc *ahc);
174 typedef enum {
175 	AHCMSG_1B,
176 	AHCMSG_2B,
177 	AHCMSG_EXT
178 } ahc_msgtype;
179 static int		ahc_sent_msg(struct ahc_softc *ahc, ahc_msgtype type,
180 				     u_int msgval, int full);
181 static int		ahc_parse_msg(struct ahc_softc *ahc,
182 				      struct ahc_devinfo *devinfo);
183 static int		ahc_handle_msg_reject(struct ahc_softc *ahc,
184 					      struct ahc_devinfo *devinfo);
185 static void		ahc_handle_ign_wide_residue(struct ahc_softc *ahc,
186 						struct ahc_devinfo *devinfo);
187 static void		ahc_reinitialize_dataptrs(struct ahc_softc *ahc);
188 static void		ahc_handle_devreset(struct ahc_softc *ahc,
189 					    struct ahc_devinfo *devinfo,
190 					    cam_status status, char *message,
191 					    int verbose_level);
192 #ifdef AHC_TARGET_MODE
193 static void		ahc_setup_target_msgin(struct ahc_softc *ahc,
194 					       struct ahc_devinfo *devinfo,
195 					       struct scb *scb);
196 #endif
197 
198 static bus_dmamap_callback_t	ahc_dmamap_cb;
199 static void		ahc_build_free_scb_list(struct ahc_softc *ahc);
200 static int		ahc_init_scbdata(struct ahc_softc *ahc);
201 static void		ahc_fini_scbdata(struct ahc_softc *ahc);
202 static void		ahc_qinfifo_requeue(struct ahc_softc *ahc,
203 					    struct scb *prev_scb,
204 					    struct scb *scb);
205 static int		ahc_qinfifo_count(struct ahc_softc *ahc);
206 static u_int		ahc_rem_scb_from_disc_list(struct ahc_softc *ahc,
207 						   u_int prev, u_int scbptr);
208 static void		ahc_add_curscb_to_free_list(struct ahc_softc *ahc);
209 static u_int		ahc_rem_wscb(struct ahc_softc *ahc,
210 				     u_int scbpos, u_int prev);
211 static void		ahc_reset_current_bus(struct ahc_softc *ahc);
212 #ifdef AHC_DUMP_SEQ
213 static void		ahc_dumpseq(struct ahc_softc *ahc);
214 #endif
215 static int		ahc_loadseq(struct ahc_softc *ahc);
216 static int		ahc_check_patch(struct ahc_softc *ahc,
217 					const struct patch **start_patch,
218 					u_int start_instr, u_int *skip_addr);
219 static void		ahc_download_instr(struct ahc_softc *ahc,
220 					   u_int instrptr, uint8_t *dconsts);
221 #ifdef AHC_TARGET_MODE
222 static void		ahc_queue_lstate_event(struct ahc_softc *ahc,
223 					       struct ahc_tmode_lstate *lstate,
224 					       u_int initiator_id,
225 					       u_int event_type,
226 					       u_int event_arg);
227 static void		ahc_update_scsiid(struct ahc_softc *ahc,
228 					  u_int targid_mask);
229 static int		ahc_handle_target_cmd(struct ahc_softc *ahc,
230 					      struct target_cmd *cmd);
231 #endif
232 
233 static u_int		ahc_index_busy_tcl(struct ahc_softc *ahc, u_int tcl);
234 static void		ahc_unbusy_tcl(struct ahc_softc *ahc, u_int tcl);
235 static void		ahc_busy_tcl(struct ahc_softc *ahc,
236 				     u_int tcl, u_int busyid);
237 
238 /************************** SCB and SCB queue management **********************/
239 static void		ahc_run_untagged_queues(struct ahc_softc *ahc);
240 static void		ahc_run_untagged_queue(struct ahc_softc *ahc,
241 					       struct scb_tailq *queue);
242 
243 /****************************** Initialization ********************************/
244 static void		 ahc_alloc_scbs(struct ahc_softc *ahc);
245 static void		 ahc_shutdown(void *arg);
246 
247 /*************************** Interrupt Services *******************************/
248 static void		ahc_clear_intstat(struct ahc_softc *ahc);
249 static void		ahc_run_qoutfifo(struct ahc_softc *ahc);
250 #ifdef AHC_TARGET_MODE
251 static void		ahc_run_tqinfifo(struct ahc_softc *ahc, int paused);
252 #endif
253 static void		ahc_handle_brkadrint(struct ahc_softc *ahc);
254 static void		ahc_handle_seqint(struct ahc_softc *ahc, u_int intstat);
255 static void		ahc_handle_scsiint(struct ahc_softc *ahc,
256 					   u_int intstat);
257 static void		ahc_clear_critical_section(struct ahc_softc *ahc);
258 
259 /***************************** Error Recovery *********************************/
260 static void		ahc_freeze_devq(struct ahc_softc *ahc, struct scb *scb);
261 static int		ahc_abort_scbs(struct ahc_softc *ahc, int target,
262 				       char channel, int lun, u_int tag,
263 				       role_t role, uint32_t status);
264 static void		ahc_calc_residual(struct ahc_softc *ahc,
265 					  struct scb *scb);
266 
267 /*********************** Untagged Transaction Routines ************************/
268 static inline void	ahc_freeze_untagged_queues(struct ahc_softc *ahc);
269 static inline void	ahc_release_untagged_queues(struct ahc_softc *ahc);
270 
271 /*
272  * Block our completion routine from starting the next untagged
273  * transaction for this target or target lun.
274  */
275 static inline void
276 ahc_freeze_untagged_queues(struct ahc_softc *ahc)
277 {
278 	if ((ahc->flags & AHC_SCB_BTT) == 0)
279 		ahc->untagged_queue_lock++;
280 }
281 
282 /*
283  * Allow the next untagged transaction for this target or target lun
284  * to be executed.  We use a counting semaphore to allow the lock
285  * to be acquired recursively.  Once the count drops to zero, the
286  * transaction queues will be run.
287  */
288 static inline void
289 ahc_release_untagged_queues(struct ahc_softc *ahc)
290 {
291 	if ((ahc->flags & AHC_SCB_BTT) == 0) {
292 		ahc->untagged_queue_lock--;
293 		if (ahc->untagged_queue_lock == 0)
294 			ahc_run_untagged_queues(ahc);
295 	}
296 }
297 
298 /************************* Sequencer Execution Control ************************/
299 /*
300  * Work around any chip bugs related to halting sequencer execution.
301  * On Ultra2 controllers, we must clear the CIOBUS stretch signal by
302  * reading a register that will set this signal and deassert it.
303  * Without this workaround, if the chip is paused, by an interrupt or
304  * manual pause while accessing scb ram, accesses to certain registers
305  * will hang the system (infinite pci retries).
306  */
307 static void
308 ahc_pause_bug_fix(struct ahc_softc *ahc)
309 {
310 	if ((ahc->features & AHC_ULTRA2) != 0)
311 		(void)ahc_inb(ahc, CCSCBCTL);
312 }
313 
314 /*
315  * Determine whether the sequencer has halted code execution.
316  * Returns non-zero status if the sequencer is stopped.
317  */
318 int
319 ahc_is_paused(struct ahc_softc *ahc)
320 {
321 	return ((ahc_inb(ahc, HCNTRL) & PAUSE) != 0);
322 }
323 
324 /*
325  * Request that the sequencer stop and wait, indefinitely, for it
326  * to stop.  The sequencer will only acknowledge that it is paused
327  * once it has reached an instruction boundary and PAUSEDIS is
328  * cleared in the SEQCTL register.  The sequencer may use PAUSEDIS
329  * for critical sections.
330  */
331 void
332 ahc_pause(struct ahc_softc *ahc)
333 {
334 	ahc_outb(ahc, HCNTRL, ahc->pause);
335 
336 	/*
337 	 * Since the sequencer can disable pausing in a critical section, we
338 	 * must loop until it actually stops.
339 	 */
340 	while (ahc_is_paused(ahc) == 0)
341 		;
342 
343 	ahc_pause_bug_fix(ahc);
344 }
345 
346 /*
347  * Allow the sequencer to continue program execution.
348  * We check here to ensure that no additional interrupt
349  * sources that would cause the sequencer to halt have been
350  * asserted.  If, for example, a SCSI bus reset is detected
351  * while we are fielding a different, pausing, interrupt type,
352  * we don't want to release the sequencer before going back
353  * into our interrupt handler and dealing with this new
354  * condition.
355  */
356 void
357 ahc_unpause(struct ahc_softc *ahc)
358 {
359 	if ((ahc_inb(ahc, INTSTAT) & (SCSIINT | SEQINT | BRKADRINT)) == 0)
360 		ahc_outb(ahc, HCNTRL, ahc->unpause);
361 }
362 
363 /************************** Memory mapping routines ***************************/
364 static struct ahc_dma_seg *
365 ahc_sg_bus_to_virt(struct scb *scb, uint32_t sg_busaddr)
366 {
367 	int sg_index;
368 
369 	sg_index = (sg_busaddr - scb->sg_list_phys)/sizeof(struct ahc_dma_seg);
370 	/* sg_list_phys points to entry 1, not 0 */
371 	sg_index++;
372 
373 	return (&scb->sg_list[sg_index]);
374 }
375 
376 static uint32_t
377 ahc_sg_virt_to_bus(struct scb *scb, struct ahc_dma_seg *sg)
378 {
379 	int sg_index;
380 
381 	/* sg_list_phys points to entry 1, not 0 */
382 	sg_index = sg - &scb->sg_list[1];
383 
384 	return (scb->sg_list_phys + (sg_index * sizeof(*scb->sg_list)));
385 }
386 
387 static uint32_t
388 ahc_hscb_busaddr(struct ahc_softc *ahc, u_int index)
389 {
390 	return (ahc->scb_data->hscb_busaddr
391 		+ (sizeof(struct hardware_scb) * index));
392 }
393 
394 static void
395 ahc_sync_scb(struct ahc_softc *ahc, struct scb *scb, int op)
396 {
397 	ahc_dmamap_sync(ahc, ahc->scb_data->hscb_dmat,
398 			ahc->scb_data->hscb_dmamap,
399 			/*offset*/(scb->hscb - ahc->hscbs) * sizeof(*scb->hscb),
400 			/*len*/sizeof(*scb->hscb), op);
401 }
402 
403 void
404 ahc_sync_sglist(struct ahc_softc *ahc, struct scb *scb, int op)
405 {
406 	if (scb->sg_count == 0)
407 		return;
408 
409 	ahc_dmamap_sync(ahc, ahc->scb_data->sg_dmat, scb->sg_map->sg_dmamap,
410 			/*offset*/(scb->sg_list - scb->sg_map->sg_vaddr)
411 				* sizeof(struct ahc_dma_seg),
412 			/*len*/sizeof(struct ahc_dma_seg) * scb->sg_count, op);
413 }
414 
415 #ifdef AHC_TARGET_MODE
416 static uint32_t
417 ahc_targetcmd_offset(struct ahc_softc *ahc, u_int index)
418 {
419 	return (((uint8_t *)&ahc->targetcmds[index]) - ahc->qoutfifo);
420 }
421 #endif
422 
423 /*********************** Miscellaneous Support Functions ***********************/
424 /*
425  * Determine whether the sequencer reported a residual
426  * for this SCB/transaction.
427  */
428 static void
429 ahc_update_residual(struct ahc_softc *ahc, struct scb *scb)
430 {
431 	uint32_t sgptr;
432 
433 	sgptr = ahc_le32toh(scb->hscb->sgptr);
434 	if ((sgptr & SG_RESID_VALID) != 0)
435 		ahc_calc_residual(ahc, scb);
436 }
437 
438 /*
439  * Return pointers to the transfer negotiation information
440  * for the specified our_id/remote_id pair.
441  */
442 struct ahc_initiator_tinfo *
443 ahc_fetch_transinfo(struct ahc_softc *ahc, char channel, u_int our_id,
444 		    u_int remote_id, struct ahc_tmode_tstate **tstate)
445 {
446 	/*
447 	 * Transfer data structures are stored from the perspective
448 	 * of the target role.  Since the parameters for a connection
449 	 * in the initiator role to a given target are the same as
450 	 * when the roles are reversed, we pretend we are the target.
451 	 */
452 	if (channel == 'B')
453 		our_id += 8;
454 	*tstate = ahc->enabled_targets[our_id];
455 	return (&(*tstate)->transinfo[remote_id]);
456 }
457 
458 uint16_t
459 ahc_inw(struct ahc_softc *ahc, u_int port)
460 {
461 	uint16_t r = ahc_inb(ahc, port+1) << 8;
462 	return r | ahc_inb(ahc, port);
463 }
464 
465 void
466 ahc_outw(struct ahc_softc *ahc, u_int port, u_int value)
467 {
468 	ahc_outb(ahc, port, value & 0xFF);
469 	ahc_outb(ahc, port+1, (value >> 8) & 0xFF);
470 }
471 
472 uint32_t
473 ahc_inl(struct ahc_softc *ahc, u_int port)
474 {
475 	return ((ahc_inb(ahc, port))
476 	      | (ahc_inb(ahc, port+1) << 8)
477 	      | (ahc_inb(ahc, port+2) << 16)
478 	      | (ahc_inb(ahc, port+3) << 24));
479 }
480 
481 void
482 ahc_outl(struct ahc_softc *ahc, u_int port, uint32_t value)
483 {
484 	ahc_outb(ahc, port, (value) & 0xFF);
485 	ahc_outb(ahc, port+1, ((value) >> 8) & 0xFF);
486 	ahc_outb(ahc, port+2, ((value) >> 16) & 0xFF);
487 	ahc_outb(ahc, port+3, ((value) >> 24) & 0xFF);
488 }
489 
490 uint64_t
491 ahc_inq(struct ahc_softc *ahc, u_int port)
492 {
493 	return ((ahc_inb(ahc, port))
494 	      | (ahc_inb(ahc, port+1) << 8)
495 	      | (ahc_inb(ahc, port+2) << 16)
496 	      | (((uint64_t)ahc_inb(ahc, port+3)) << 24)
497 	      | (((uint64_t)ahc_inb(ahc, port+4)) << 32)
498 	      | (((uint64_t)ahc_inb(ahc, port+5)) << 40)
499 	      | (((uint64_t)ahc_inb(ahc, port+6)) << 48)
500 	      | (((uint64_t)ahc_inb(ahc, port+7)) << 56));
501 }
502 
503 void
504 ahc_outq(struct ahc_softc *ahc, u_int port, uint64_t value)
505 {
506 	ahc_outb(ahc, port, value & 0xFF);
507 	ahc_outb(ahc, port+1, (value >> 8) & 0xFF);
508 	ahc_outb(ahc, port+2, (value >> 16) & 0xFF);
509 	ahc_outb(ahc, port+3, (value >> 24) & 0xFF);
510 	ahc_outb(ahc, port+4, (value >> 32) & 0xFF);
511 	ahc_outb(ahc, port+5, (value >> 40) & 0xFF);
512 	ahc_outb(ahc, port+6, (value >> 48) & 0xFF);
513 	ahc_outb(ahc, port+7, (value >> 56) & 0xFF);
514 }
515 
516 /*
517  * Get a free scb. If there are none, see if we can allocate a new SCB.
518  */
519 struct scb *
520 ahc_get_scb(struct ahc_softc *ahc)
521 {
522 	struct scb *scb;
523 
524 	if ((scb = SLIST_FIRST(&ahc->scb_data->free_scbs)) == NULL) {
525 		ahc_alloc_scbs(ahc);
526 		scb = SLIST_FIRST(&ahc->scb_data->free_scbs);
527 		if (scb == NULL)
528 			return (NULL);
529 	}
530 	SLIST_REMOVE_HEAD(&ahc->scb_data->free_scbs, links.sle);
531 	return (scb);
532 }
533 
534 /*
535  * Return an SCB resource to the free list.
536  */
537 void
538 ahc_free_scb(struct ahc_softc *ahc, struct scb *scb)
539 {
540 	struct hardware_scb *hscb;
541 
542 	hscb = scb->hscb;
543 	/* Clean up for the next user */
544 	ahc->scb_data->scbindex[hscb->tag] = NULL;
545 	scb->flags = SCB_FREE;
546 	hscb->control = 0;
547 
548 	SLIST_INSERT_HEAD(&ahc->scb_data->free_scbs, scb, links.sle);
549 
550 	/* Notify the OSM that a resource is now available. */
551 	ahc_platform_scb_free(ahc, scb);
552 }
553 
554 struct scb *
555 ahc_lookup_scb(struct ahc_softc *ahc, u_int tag)
556 {
557 	struct scb* scb;
558 
559 	scb = ahc->scb_data->scbindex[tag];
560 	if (scb != NULL)
561 		ahc_sync_scb(ahc, scb,
562 			     BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
563 	return (scb);
564 }
565 
566 static void
567 ahc_swap_with_next_hscb(struct ahc_softc *ahc, struct scb *scb)
568 {
569 	struct hardware_scb *q_hscb;
570 	u_int  saved_tag;
571 
572 	/*
573 	 * Our queuing method is a bit tricky.  The card
574 	 * knows in advance which HSCB to download, and we
575 	 * can't disappoint it.  To achieve this, the next
576 	 * SCB to download is saved off in ahc->next_queued_scb.
577 	 * When we are called to queue "an arbitrary scb",
578 	 * we copy the contents of the incoming HSCB to the one
579 	 * the sequencer knows about, swap HSCB pointers and
580 	 * finally assign the SCB to the tag indexed location
581 	 * in the scb_array.  This makes sure that we can still
582 	 * locate the correct SCB by SCB_TAG.
583 	 */
584 	q_hscb = ahc->next_queued_scb->hscb;
585 	saved_tag = q_hscb->tag;
586 	memcpy(q_hscb, scb->hscb, sizeof(*scb->hscb));
587 	if ((scb->flags & SCB_CDB32_PTR) != 0) {
588 		q_hscb->shared_data.cdb_ptr =
589 		    ahc_htole32(ahc_hscb_busaddr(ahc, q_hscb->tag)
590 			      + offsetof(struct hardware_scb, cdb32));
591 	}
592 	q_hscb->tag = saved_tag;
593 	q_hscb->next = scb->hscb->tag;
594 
595 	/* Now swap HSCB pointers. */
596 	ahc->next_queued_scb->hscb = scb->hscb;
597 	scb->hscb = q_hscb;
598 
599 	/* Now define the mapping from tag to SCB in the scbindex */
600 	ahc->scb_data->scbindex[scb->hscb->tag] = scb;
601 }
602 
603 /*
604  * Tell the sequencer about a new transaction to execute.
605  */
606 void
607 ahc_queue_scb(struct ahc_softc *ahc, struct scb *scb)
608 {
609 	ahc_swap_with_next_hscb(ahc, scb);
610 
611 	if (scb->hscb->tag == SCB_LIST_NULL
612 	 || scb->hscb->next == SCB_LIST_NULL)
613 		panic("Attempt to queue invalid SCB tag %x:%x\n",
614 		      scb->hscb->tag, scb->hscb->next);
615 
616 	/*
617 	 * Setup data "oddness".
618 	 */
619 	scb->hscb->lun &= LID;
620 	if (ahc_get_transfer_length(scb) & 0x1)
621 		scb->hscb->lun |= SCB_XFERLEN_ODD;
622 
623 	/*
624 	 * Keep a history of SCBs we've downloaded in the qinfifo.
625 	 */
626 	ahc->qinfifo[ahc->qinfifonext++] = scb->hscb->tag;
627 
628 	/*
629 	 * Make sure our data is consistent from the
630 	 * perspective of the adapter.
631 	 */
632 	ahc_sync_scb(ahc, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
633 
634 	/* Tell the adapter about the newly queued SCB */
635 	if ((ahc->features & AHC_QUEUE_REGS) != 0) {
636 		ahc_outb(ahc, HNSCB_QOFF, ahc->qinfifonext);
637 	} else {
638 		if ((ahc->features & AHC_AUTOPAUSE) == 0)
639 			ahc_pause(ahc);
640 		ahc_outb(ahc, KERNEL_QINPOS, ahc->qinfifonext);
641 		if ((ahc->features & AHC_AUTOPAUSE) == 0)
642 			ahc_unpause(ahc);
643 	}
644 }
645 
646 struct scsi_sense_data *
647 ahc_get_sense_buf(struct ahc_softc *ahc, struct scb *scb)
648 {
649 	int offset;
650 
651 	offset = scb - ahc->scb_data->scbarray;
652 	return (&ahc->scb_data->sense[offset]);
653 }
654 
655 static uint32_t
656 ahc_get_sense_bufaddr(struct ahc_softc *ahc, struct scb *scb)
657 {
658 	int offset;
659 
660 	offset = scb - ahc->scb_data->scbarray;
661 	return (ahc->scb_data->sense_busaddr
662 	      + (offset * sizeof(struct scsi_sense_data)));
663 }
664 
665 /************************** Interrupt Processing ******************************/
666 static void
667 ahc_sync_qoutfifo(struct ahc_softc *ahc, int op)
668 {
669 	ahc_dmamap_sync(ahc, ahc->shared_data_dmat, ahc->shared_data_dmamap,
670 			/*offset*/0, /*len*/256, op);
671 }
672 
673 static void
674 ahc_sync_tqinfifo(struct ahc_softc *ahc, int op)
675 {
676 #ifdef AHC_TARGET_MODE
677 	if ((ahc->flags & AHC_TARGETROLE) != 0) {
678 		ahc_dmamap_sync(ahc, ahc->shared_data_dmat,
679 				ahc->shared_data_dmamap,
680 				ahc_targetcmd_offset(ahc, 0),
681 				sizeof(struct target_cmd) * AHC_TMODE_CMDS,
682 				op);
683 	}
684 #endif
685 }
686 
687 /*
688  * See if the firmware has posted any completed commands
689  * into our in-core command complete fifos.
690  */
691 #define AHC_RUN_QOUTFIFO 0x1
692 #define AHC_RUN_TQINFIFO 0x2
693 static u_int
694 ahc_check_cmdcmpltqueues(struct ahc_softc *ahc)
695 {
696 	u_int retval;
697 
698 	retval = 0;
699 	ahc_dmamap_sync(ahc, ahc->shared_data_dmat, ahc->shared_data_dmamap,
700 			/*offset*/ahc->qoutfifonext, /*len*/1,
701 			BUS_DMASYNC_POSTREAD);
702 	if (ahc->qoutfifo[ahc->qoutfifonext] != SCB_LIST_NULL)
703 		retval |= AHC_RUN_QOUTFIFO;
704 #ifdef AHC_TARGET_MODE
705 	if ((ahc->flags & AHC_TARGETROLE) != 0
706 	 && (ahc->flags & AHC_TQINFIFO_BLOCKED) == 0) {
707 		ahc_dmamap_sync(ahc, ahc->shared_data_dmat,
708 				ahc->shared_data_dmamap,
709 				ahc_targetcmd_offset(ahc, ahc->tqinfifofnext),
710 				/*len*/sizeof(struct target_cmd),
711 				BUS_DMASYNC_POSTREAD);
712 		if (ahc->targetcmds[ahc->tqinfifonext].cmd_valid != 0)
713 			retval |= AHC_RUN_TQINFIFO;
714 	}
715 #endif
716 	return (retval);
717 }
718 
719 /*
720  * Catch an interrupt from the adapter
721  */
722 int
723 ahc_intr(struct ahc_softc *ahc)
724 {
725 	u_int	intstat;
726 
727 	if ((ahc->pause & INTEN) == 0) {
728 		/*
729 		 * Our interrupt is not enabled on the chip
730 		 * and may be disabled for re-entrancy reasons,
731 		 * so just return.  This is likely just a shared
732 		 * interrupt.
733 		 */
734 		return (0);
735 	}
736 	/*
737 	 * Instead of directly reading the interrupt status register,
738 	 * infer the cause of the interrupt by checking our in-core
739 	 * completion queues.  This avoids a costly PCI bus read in
740 	 * most cases.
741 	 */
742 	if ((ahc->flags & (AHC_ALL_INTERRUPTS|AHC_EDGE_INTERRUPT)) == 0
743 	 && (ahc_check_cmdcmpltqueues(ahc) != 0))
744 		intstat = CMDCMPLT;
745 	else {
746 		intstat = ahc_inb(ahc, INTSTAT);
747 	}
748 
749 	if ((intstat & INT_PEND) == 0) {
750 #if AHC_PCI_CONFIG > 0
751 		if (ahc->unsolicited_ints > 500) {
752 			ahc->unsolicited_ints = 0;
753 			if ((ahc->chip & AHC_PCI) != 0
754 			 && (ahc_inb(ahc, ERROR) & PCIERRSTAT) != 0)
755 				ahc->bus_intr(ahc);
756 		}
757 #endif
758 		ahc->unsolicited_ints++;
759 		return (0);
760 	}
761 	ahc->unsolicited_ints = 0;
762 
763 	if (intstat & CMDCMPLT) {
764 		ahc_outb(ahc, CLRINT, CLRCMDINT);
765 
766 		/*
767 		 * Ensure that the chip sees that we've cleared
768 		 * this interrupt before we walk the output fifo.
769 		 * Otherwise, we may, due to posted bus writes,
770 		 * clear the interrupt after we finish the scan,
771 		 * and after the sequencer has added new entries
772 		 * and asserted the interrupt again.
773 		 */
774 		ahc_flush_device_writes(ahc);
775 		ahc_run_qoutfifo(ahc);
776 #ifdef AHC_TARGET_MODE
777 		if ((ahc->flags & AHC_TARGETROLE) != 0)
778 			ahc_run_tqinfifo(ahc, /*paused*/FALSE);
779 #endif
780 	}
781 
782 	/*
783 	 * Handle statuses that may invalidate our cached
784 	 * copy of INTSTAT separately.
785 	 */
786 	if (intstat == 0xFF && (ahc->features & AHC_REMOVABLE) != 0) {
787 		/* Hot eject.  Do nothing */
788 	} else if (intstat & BRKADRINT) {
789 		ahc_handle_brkadrint(ahc);
790 	} else if ((intstat & (SEQINT|SCSIINT)) != 0) {
791 
792 		ahc_pause_bug_fix(ahc);
793 
794 		if ((intstat & SEQINT) != 0)
795 			ahc_handle_seqint(ahc, intstat);
796 
797 		if ((intstat & SCSIINT) != 0)
798 			ahc_handle_scsiint(ahc, intstat);
799 	}
800 	return (1);
801 }
802 
803 /************************* Sequencer Execution Control ************************/
804 /*
805  * Restart the sequencer program from address zero
806  */
807 static void
808 ahc_restart(struct ahc_softc *ahc)
809 {
810 	uint8_t	sblkctl;
811 
812 	ahc_pause(ahc);
813 
814 	/* No more pending messages. */
815 	ahc_clear_msg_state(ahc);
816 
817 	ahc_outb(ahc, SCSISIGO, 0);		/* De-assert BSY */
818 	ahc_outb(ahc, MSG_OUT, NOP);	/* No message to send */
819 	ahc_outb(ahc, SXFRCTL1, ahc_inb(ahc, SXFRCTL1) & ~BITBUCKET);
820 	ahc_outb(ahc, LASTPHASE, P_BUSFREE);
821 	ahc_outb(ahc, SAVED_SCSIID, 0xFF);
822 	ahc_outb(ahc, SAVED_LUN, 0xFF);
823 
824 	/*
825 	 * Ensure that the sequencer's idea of TQINPOS
826 	 * matches our own.  The sequencer increments TQINPOS
827 	 * only after it sees a DMA complete and a reset could
828 	 * occur before the increment leaving the kernel to believe
829 	 * the command arrived but the sequencer to not.
830 	 */
831 	ahc_outb(ahc, TQINPOS, ahc->tqinfifonext);
832 
833 	/* Always allow reselection */
834 	ahc_outb(ahc, SCSISEQ,
835 		 ahc_inb(ahc, SCSISEQ_TEMPLATE) & (ENSELI|ENRSELI|ENAUTOATNP));
836 	if ((ahc->features & AHC_CMD_CHAN) != 0) {
837 		/* Ensure that no DMA operations are in progress */
838 		ahc_outb(ahc, CCSCBCNT, 0);
839 		ahc_outb(ahc, CCSGCTL, 0);
840 		ahc_outb(ahc, CCSCBCTL, 0);
841 	}
842 	/*
843 	 * If we were in the process of DMA'ing SCB data into
844 	 * an SCB, replace that SCB on the free list.  This prevents
845 	 * an SCB leak.
846 	 */
847 	if ((ahc_inb(ahc, SEQ_FLAGS2) & SCB_DMA) != 0) {
848 		ahc_add_curscb_to_free_list(ahc);
849 		ahc_outb(ahc, SEQ_FLAGS2,
850 			 ahc_inb(ahc, SEQ_FLAGS2) & ~SCB_DMA);
851 	}
852 
853 	/*
854 	 * Clear any pending sequencer interrupt.  It is no
855 	 * longer relevant since we're resetting the Program
856 	 * Counter.
857 	 */
858 	ahc_outb(ahc, CLRINT, CLRSEQINT);
859 
860 	ahc_outb(ahc, MWI_RESIDUAL, 0);
861 	ahc_outb(ahc, SEQCTL, ahc->seqctl);
862 	ahc_outb(ahc, SEQADDR0, 0);
863 	ahc_outb(ahc, SEQADDR1, 0);
864 
865 	/*
866 	 * Take the LED out of diagnostic mode on PM resume, too
867 	 */
868 	sblkctl = ahc_inb(ahc, SBLKCTL);
869 	ahc_outb(ahc, SBLKCTL, (sblkctl & ~(DIAGLEDEN|DIAGLEDON)));
870 
871 	ahc_unpause(ahc);
872 }
873 
874 /************************* Input/Output Queues ********************************/
875 static void
876 ahc_run_qoutfifo(struct ahc_softc *ahc)
877 {
878 	struct scb *scb;
879 	u_int  scb_index;
880 
881 	ahc_sync_qoutfifo(ahc, BUS_DMASYNC_POSTREAD);
882 	while (ahc->qoutfifo[ahc->qoutfifonext] != SCB_LIST_NULL) {
883 
884 		scb_index = ahc->qoutfifo[ahc->qoutfifonext];
885 		if ((ahc->qoutfifonext & 0x03) == 0x03) {
886 			u_int modnext;
887 
888 			/*
889 			 * Clear 32bits of QOUTFIFO at a time
890 			 * so that we don't clobber an incoming
891 			 * byte DMA to the array on architectures
892 			 * that only support 32bit load and store
893 			 * operations.
894 			 */
895 			modnext = ahc->qoutfifonext & ~0x3;
896 			*((uint32_t *)(&ahc->qoutfifo[modnext])) = 0xFFFFFFFFUL;
897 			ahc_dmamap_sync(ahc, ahc->shared_data_dmat,
898 					ahc->shared_data_dmamap,
899 					/*offset*/modnext, /*len*/4,
900 					BUS_DMASYNC_PREREAD);
901 		}
902 		ahc->qoutfifonext++;
903 
904 		scb = ahc_lookup_scb(ahc, scb_index);
905 		if (scb == NULL) {
906 			printk("%s: WARNING no command for scb %d "
907 			       "(cmdcmplt)\nQOUTPOS = %d\n",
908 			       ahc_name(ahc), scb_index,
909 			       (ahc->qoutfifonext - 1) & 0xFF);
910 			continue;
911 		}
912 
913 		/*
914 		 * Save off the residual
915 		 * if there is one.
916 		 */
917 		ahc_update_residual(ahc, scb);
918 		ahc_done(ahc, scb);
919 	}
920 }
921 
922 static void
923 ahc_run_untagged_queues(struct ahc_softc *ahc)
924 {
925 	int i;
926 
927 	for (i = 0; i < 16; i++)
928 		ahc_run_untagged_queue(ahc, &ahc->untagged_queues[i]);
929 }
930 
931 static void
932 ahc_run_untagged_queue(struct ahc_softc *ahc, struct scb_tailq *queue)
933 {
934 	struct scb *scb;
935 
936 	if (ahc->untagged_queue_lock != 0)
937 		return;
938 
939 	if ((scb = TAILQ_FIRST(queue)) != NULL
940 	 && (scb->flags & SCB_ACTIVE) == 0) {
941 		scb->flags |= SCB_ACTIVE;
942 		ahc_queue_scb(ahc, scb);
943 	}
944 }
945 
946 /************************* Interrupt Handling *********************************/
947 static void
948 ahc_handle_brkadrint(struct ahc_softc *ahc)
949 {
950 	/*
951 	 * We upset the sequencer :-(
952 	 * Lookup the error message
953 	 */
954 	int i;
955 	int error;
956 
957 	error = ahc_inb(ahc, ERROR);
958 	for (i = 0; error != 1 && i < num_errors; i++)
959 		error >>= 1;
960 	printk("%s: brkadrint, %s at seqaddr = 0x%x\n",
961 	       ahc_name(ahc), ahc_hard_errors[i].errmesg,
962 	       ahc_inb(ahc, SEQADDR0) |
963 	       (ahc_inb(ahc, SEQADDR1) << 8));
964 
965 	ahc_dump_card_state(ahc);
966 
967 	/* Tell everyone that this HBA is no longer available */
968 	ahc_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
969 		       CAM_LUN_WILDCARD, SCB_LIST_NULL, ROLE_UNKNOWN,
970 		       CAM_NO_HBA);
971 
972 	/* Disable all interrupt sources by resetting the controller */
973 	ahc_shutdown(ahc);
974 }
975 
976 static void
977 ahc_handle_seqint(struct ahc_softc *ahc, u_int intstat)
978 {
979 	struct scb *scb;
980 	struct ahc_devinfo devinfo;
981 
982 	ahc_fetch_devinfo(ahc, &devinfo);
983 
984 	/*
985 	 * Clear the upper byte that holds SEQINT status
986 	 * codes and clear the SEQINT bit. We will unpause
987 	 * the sequencer, if appropriate, after servicing
988 	 * the request.
989 	 */
990 	ahc_outb(ahc, CLRINT, CLRSEQINT);
991 	switch (intstat & SEQINT_MASK) {
992 	case BAD_STATUS:
993 	{
994 		u_int  scb_index;
995 		struct hardware_scb *hscb;
996 
997 		/*
998 		 * Set the default return value to 0 (don't
999 		 * send sense).  The sense code will change
1000 		 * this if needed.
1001 		 */
1002 		ahc_outb(ahc, RETURN_1, 0);
1003 
1004 		/*
1005 		 * The sequencer will notify us when a command
1006 		 * has an error that would be of interest to
1007 		 * the kernel.  This allows us to leave the sequencer
1008 		 * running in the common case of command completes
1009 		 * without error.  The sequencer will already have
1010 		 * dma'd the SCB back up to us, so we can reference
1011 		 * the in kernel copy directly.
1012 		 */
1013 		scb_index = ahc_inb(ahc, SCB_TAG);
1014 		scb = ahc_lookup_scb(ahc, scb_index);
1015 		if (scb == NULL) {
1016 			ahc_print_devinfo(ahc, &devinfo);
1017 			printk("ahc_intr - referenced scb "
1018 			       "not valid during seqint 0x%x scb(%d)\n",
1019 			       intstat, scb_index);
1020 			ahc_dump_card_state(ahc);
1021 			panic("for safety");
1022 			goto unpause;
1023 		}
1024 
1025 		hscb = scb->hscb;
1026 
1027 		/* Don't want to clobber the original sense code */
1028 		if ((scb->flags & SCB_SENSE) != 0) {
1029 			/*
1030 			 * Clear the SCB_SENSE Flag and have
1031 			 * the sequencer do a normal command
1032 			 * complete.
1033 			 */
1034 			scb->flags &= ~SCB_SENSE;
1035 			ahc_set_transaction_status(scb, CAM_AUTOSENSE_FAIL);
1036 			break;
1037 		}
1038 		ahc_set_transaction_status(scb, CAM_SCSI_STATUS_ERROR);
1039 		/* Freeze the queue until the client sees the error. */
1040 		ahc_freeze_devq(ahc, scb);
1041 		ahc_freeze_scb(scb);
1042 		ahc_set_scsi_status(scb, hscb->shared_data.status.scsi_status);
1043 		switch (hscb->shared_data.status.scsi_status) {
1044 		case SAM_STAT_GOOD:
1045 			printk("%s: Interrupted for status of 0???\n",
1046 			       ahc_name(ahc));
1047 			break;
1048 		case SAM_STAT_COMMAND_TERMINATED:
1049 		case SAM_STAT_CHECK_CONDITION:
1050 		{
1051 			struct ahc_dma_seg *sg;
1052 			struct scsi_sense *sc;
1053 			struct ahc_initiator_tinfo *targ_info;
1054 			struct ahc_tmode_tstate *tstate;
1055 			struct ahc_transinfo *tinfo;
1056 #ifdef AHC_DEBUG
1057 			if (ahc_debug & AHC_SHOW_SENSE) {
1058 				ahc_print_path(ahc, scb);
1059 				printk("SCB %d: requests Check Status\n",
1060 				       scb->hscb->tag);
1061 			}
1062 #endif
1063 
1064 			if (ahc_perform_autosense(scb) == 0)
1065 				break;
1066 
1067 			targ_info = ahc_fetch_transinfo(ahc,
1068 							devinfo.channel,
1069 							devinfo.our_scsiid,
1070 							devinfo.target,
1071 							&tstate);
1072 			tinfo = &targ_info->curr;
1073 			sg = scb->sg_list;
1074 			sc = (struct scsi_sense *)(&hscb->shared_data.cdb);
1075 			/*
1076 			 * Save off the residual if there is one.
1077 			 */
1078 			ahc_update_residual(ahc, scb);
1079 #ifdef AHC_DEBUG
1080 			if (ahc_debug & AHC_SHOW_SENSE) {
1081 				ahc_print_path(ahc, scb);
1082 				printk("Sending Sense\n");
1083 			}
1084 #endif
1085 			sg->addr = ahc_get_sense_bufaddr(ahc, scb);
1086 			sg->len = ahc_get_sense_bufsize(ahc, scb);
1087 			sg->len |= AHC_DMA_LAST_SEG;
1088 
1089 			/* Fixup byte order */
1090 			sg->addr = ahc_htole32(sg->addr);
1091 			sg->len = ahc_htole32(sg->len);
1092 
1093 			sc->opcode = REQUEST_SENSE;
1094 			sc->byte2 = 0;
1095 			if (tinfo->protocol_version <= SCSI_REV_2
1096 			 && SCB_GET_LUN(scb) < 8)
1097 				sc->byte2 = SCB_GET_LUN(scb) << 5;
1098 			sc->unused[0] = 0;
1099 			sc->unused[1] = 0;
1100 			sc->length = sg->len;
1101 			sc->control = 0;
1102 
1103 			/*
1104 			 * We can't allow the target to disconnect.
1105 			 * This will be an untagged transaction and
1106 			 * having the target disconnect will make this
1107 			 * transaction indestinguishable from outstanding
1108 			 * tagged transactions.
1109 			 */
1110 			hscb->control = 0;
1111 
1112 			/*
1113 			 * This request sense could be because the
1114 			 * the device lost power or in some other
1115 			 * way has lost our transfer negotiations.
1116 			 * Renegotiate if appropriate.  Unit attention
1117 			 * errors will be reported before any data
1118 			 * phases occur.
1119 			 */
1120 			if (ahc_get_residual(scb)
1121 			    == ahc_get_transfer_length(scb)) {
1122 				ahc_update_neg_request(ahc, &devinfo,
1123 						       tstate, targ_info,
1124 						       AHC_NEG_IF_NON_ASYNC);
1125 			}
1126 			if (tstate->auto_negotiate & devinfo.target_mask) {
1127 				hscb->control |= MK_MESSAGE;
1128 				scb->flags &= ~SCB_NEGOTIATE;
1129 				scb->flags |= SCB_AUTO_NEGOTIATE;
1130 			}
1131 			hscb->cdb_len = sizeof(*sc);
1132 			hscb->dataptr = sg->addr;
1133 			hscb->datacnt = sg->len;
1134 			hscb->sgptr = scb->sg_list_phys | SG_FULL_RESID;
1135 			hscb->sgptr = ahc_htole32(hscb->sgptr);
1136 			scb->sg_count = 1;
1137 			scb->flags |= SCB_SENSE;
1138 			ahc_qinfifo_requeue_tail(ahc, scb);
1139 			ahc_outb(ahc, RETURN_1, SEND_SENSE);
1140 			/*
1141 			 * Ensure we have enough time to actually
1142 			 * retrieve the sense.
1143 			 */
1144 			ahc_scb_timer_reset(scb, 5 * 1000000);
1145 			break;
1146 		}
1147 		default:
1148 			break;
1149 		}
1150 		break;
1151 	}
1152 	case NO_MATCH:
1153 	{
1154 		/* Ensure we don't leave the selection hardware on */
1155 		ahc_outb(ahc, SCSISEQ,
1156 			 ahc_inb(ahc, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP));
1157 
1158 		printk("%s:%c:%d: no active SCB for reconnecting "
1159 		       "target - issuing BUS DEVICE RESET\n",
1160 		       ahc_name(ahc), devinfo.channel, devinfo.target);
1161 		printk("SAVED_SCSIID == 0x%x, SAVED_LUN == 0x%x, "
1162 		       "ARG_1 == 0x%x ACCUM = 0x%x\n",
1163 		       ahc_inb(ahc, SAVED_SCSIID), ahc_inb(ahc, SAVED_LUN),
1164 		       ahc_inb(ahc, ARG_1), ahc_inb(ahc, ACCUM));
1165 		printk("SEQ_FLAGS == 0x%x, SCBPTR == 0x%x, BTT == 0x%x, "
1166 		       "SINDEX == 0x%x\n",
1167 		       ahc_inb(ahc, SEQ_FLAGS), ahc_inb(ahc, SCBPTR),
1168 		       ahc_index_busy_tcl(ahc,
1169 			    BUILD_TCL(ahc_inb(ahc, SAVED_SCSIID),
1170 				      ahc_inb(ahc, SAVED_LUN))),
1171 		       ahc_inb(ahc, SINDEX));
1172 		printk("SCSIID == 0x%x, SCB_SCSIID == 0x%x, SCB_LUN == 0x%x, "
1173 		       "SCB_TAG == 0x%x, SCB_CONTROL == 0x%x\n",
1174 		       ahc_inb(ahc, SCSIID), ahc_inb(ahc, SCB_SCSIID),
1175 		       ahc_inb(ahc, SCB_LUN), ahc_inb(ahc, SCB_TAG),
1176 		       ahc_inb(ahc, SCB_CONTROL));
1177 		printk("SCSIBUSL == 0x%x, SCSISIGI == 0x%x\n",
1178 		       ahc_inb(ahc, SCSIBUSL), ahc_inb(ahc, SCSISIGI));
1179 		printk("SXFRCTL0 == 0x%x\n", ahc_inb(ahc, SXFRCTL0));
1180 		printk("SEQCTL == 0x%x\n", ahc_inb(ahc, SEQCTL));
1181 		ahc_dump_card_state(ahc);
1182 		ahc->msgout_buf[0] = TARGET_RESET;
1183 		ahc->msgout_len = 1;
1184 		ahc->msgout_index = 0;
1185 		ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
1186 		ahc_outb(ahc, MSG_OUT, HOST_MSG);
1187 		ahc_assert_atn(ahc);
1188 		break;
1189 	}
1190 	case SEND_REJECT:
1191 	{
1192 		u_int rejbyte = ahc_inb(ahc, ACCUM);
1193 		printk("%s:%c:%d: Warning - unknown message received from "
1194 		       "target (0x%x).  Rejecting\n",
1195 		       ahc_name(ahc), devinfo.channel, devinfo.target, rejbyte);
1196 		break;
1197 	}
1198 	case PROTO_VIOLATION:
1199 	{
1200 		ahc_handle_proto_violation(ahc);
1201 		break;
1202 	}
1203 	case IGN_WIDE_RES:
1204 		ahc_handle_ign_wide_residue(ahc, &devinfo);
1205 		break;
1206 	case PDATA_REINIT:
1207 		ahc_reinitialize_dataptrs(ahc);
1208 		break;
1209 	case BAD_PHASE:
1210 	{
1211 		u_int lastphase;
1212 
1213 		lastphase = ahc_inb(ahc, LASTPHASE);
1214 		printk("%s:%c:%d: unknown scsi bus phase %x, "
1215 		       "lastphase = 0x%x.  Attempting to continue\n",
1216 		       ahc_name(ahc), devinfo.channel, devinfo.target,
1217 		       lastphase, ahc_inb(ahc, SCSISIGI));
1218 		break;
1219 	}
1220 	case MISSED_BUSFREE:
1221 	{
1222 		u_int lastphase;
1223 
1224 		lastphase = ahc_inb(ahc, LASTPHASE);
1225 		printk("%s:%c:%d: Missed busfree. "
1226 		       "Lastphase = 0x%x, Curphase = 0x%x\n",
1227 		       ahc_name(ahc), devinfo.channel, devinfo.target,
1228 		       lastphase, ahc_inb(ahc, SCSISIGI));
1229 		ahc_restart(ahc);
1230 		return;
1231 	}
1232 	case HOST_MSG_LOOP:
1233 	{
1234 		/*
1235 		 * The sequencer has encountered a message phase
1236 		 * that requires host assistance for completion.
1237 		 * While handling the message phase(s), we will be
1238 		 * notified by the sequencer after each byte is
1239 		 * transferred so we can track bus phase changes.
1240 		 *
1241 		 * If this is the first time we've seen a HOST_MSG_LOOP
1242 		 * interrupt, initialize the state of the host message
1243 		 * loop.
1244 		 */
1245 		if (ahc->msg_type == MSG_TYPE_NONE) {
1246 			struct scb *scb;
1247 			u_int scb_index;
1248 			u_int bus_phase;
1249 
1250 			bus_phase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
1251 			if (bus_phase != P_MESGIN
1252 			 && bus_phase != P_MESGOUT) {
1253 				printk("ahc_intr: HOST_MSG_LOOP bad "
1254 				       "phase 0x%x\n",
1255 				      bus_phase);
1256 				/*
1257 				 * Probably transitioned to bus free before
1258 				 * we got here.  Just punt the message.
1259 				 */
1260 				ahc_clear_intstat(ahc);
1261 				ahc_restart(ahc);
1262 				return;
1263 			}
1264 
1265 			scb_index = ahc_inb(ahc, SCB_TAG);
1266 			scb = ahc_lookup_scb(ahc, scb_index);
1267 			if (devinfo.role == ROLE_INITIATOR) {
1268 				if (bus_phase == P_MESGOUT) {
1269 					if (scb == NULL)
1270 						panic("HOST_MSG_LOOP with "
1271 						      "invalid SCB %x\n",
1272 						      scb_index);
1273 
1274 					ahc_setup_initiator_msgout(ahc,
1275 								   &devinfo,
1276 								   scb);
1277 				} else {
1278 					ahc->msg_type =
1279 					    MSG_TYPE_INITIATOR_MSGIN;
1280 					ahc->msgin_index = 0;
1281 				}
1282 			}
1283 #ifdef AHC_TARGET_MODE
1284 			else {
1285 				if (bus_phase == P_MESGOUT) {
1286 					ahc->msg_type =
1287 					    MSG_TYPE_TARGET_MSGOUT;
1288 					ahc->msgin_index = 0;
1289 				} else
1290 					ahc_setup_target_msgin(ahc,
1291 							       &devinfo,
1292 							       scb);
1293 			}
1294 #endif
1295 		}
1296 
1297 		ahc_handle_message_phase(ahc);
1298 		break;
1299 	}
1300 	case PERR_DETECTED:
1301 	{
1302 		/*
1303 		 * If we've cleared the parity error interrupt
1304 		 * but the sequencer still believes that SCSIPERR
1305 		 * is true, it must be that the parity error is
1306 		 * for the currently presented byte on the bus,
1307 		 * and we are not in a phase (data-in) where we will
1308 		 * eventually ack this byte.  Ack the byte and
1309 		 * throw it away in the hope that the target will
1310 		 * take us to message out to deliver the appropriate
1311 		 * error message.
1312 		 */
1313 		if ((intstat & SCSIINT) == 0
1314 		 && (ahc_inb(ahc, SSTAT1) & SCSIPERR) != 0) {
1315 
1316 			if ((ahc->features & AHC_DT) == 0) {
1317 				u_int curphase;
1318 
1319 				/*
1320 				 * The hardware will only let you ack bytes
1321 				 * if the expected phase in SCSISIGO matches
1322 				 * the current phase.  Make sure this is
1323 				 * currently the case.
1324 				 */
1325 				curphase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
1326 				ahc_outb(ahc, LASTPHASE, curphase);
1327 				ahc_outb(ahc, SCSISIGO, curphase);
1328 			}
1329 			if ((ahc_inb(ahc, SCSISIGI) & (CDI|MSGI)) == 0) {
1330 				int wait;
1331 
1332 				/*
1333 				 * In a data phase.  Faster to bitbucket
1334 				 * the data than to individually ack each
1335 				 * byte.  This is also the only strategy
1336 				 * that will work with AUTOACK enabled.
1337 				 */
1338 				ahc_outb(ahc, SXFRCTL1,
1339 					 ahc_inb(ahc, SXFRCTL1) | BITBUCKET);
1340 				wait = 5000;
1341 				while (--wait != 0) {
1342 					if ((ahc_inb(ahc, SCSISIGI)
1343 					  & (CDI|MSGI)) != 0)
1344 						break;
1345 					ahc_delay(100);
1346 				}
1347 				ahc_outb(ahc, SXFRCTL1,
1348 					 ahc_inb(ahc, SXFRCTL1) & ~BITBUCKET);
1349 				if (wait == 0) {
1350 					struct	scb *scb;
1351 					u_int	scb_index;
1352 
1353 					ahc_print_devinfo(ahc, &devinfo);
1354 					printk("Unable to clear parity error.  "
1355 					       "Resetting bus.\n");
1356 					scb_index = ahc_inb(ahc, SCB_TAG);
1357 					scb = ahc_lookup_scb(ahc, scb_index);
1358 					if (scb != NULL)
1359 						ahc_set_transaction_status(scb,
1360 						    CAM_UNCOR_PARITY);
1361 					ahc_reset_channel(ahc, devinfo.channel,
1362 							  /*init reset*/TRUE);
1363 				}
1364 			} else {
1365 				ahc_inb(ahc, SCSIDATL);
1366 			}
1367 		}
1368 		break;
1369 	}
1370 	case DATA_OVERRUN:
1371 	{
1372 		/*
1373 		 * When the sequencer detects an overrun, it
1374 		 * places the controller in "BITBUCKET" mode
1375 		 * and allows the target to complete its transfer.
1376 		 * Unfortunately, none of the counters get updated
1377 		 * when the controller is in this mode, so we have
1378 		 * no way of knowing how large the overrun was.
1379 		 */
1380 		u_int scbindex = ahc_inb(ahc, SCB_TAG);
1381 		u_int lastphase = ahc_inb(ahc, LASTPHASE);
1382 		u_int i;
1383 
1384 		scb = ahc_lookup_scb(ahc, scbindex);
1385 		for (i = 0; i < num_phases; i++) {
1386 			if (lastphase == ahc_phase_table[i].phase)
1387 				break;
1388 		}
1389 		ahc_print_path(ahc, scb);
1390 		printk("data overrun detected %s."
1391 		       "  Tag == 0x%x.\n",
1392 		       ahc_phase_table[i].phasemsg,
1393 		       scb->hscb->tag);
1394 		ahc_print_path(ahc, scb);
1395 		printk("%s seen Data Phase.  Length = %ld.  NumSGs = %d.\n",
1396 		       ahc_inb(ahc, SEQ_FLAGS) & DPHASE ? "Have" : "Haven't",
1397 		       ahc_get_transfer_length(scb), scb->sg_count);
1398 		if (scb->sg_count > 0) {
1399 			for (i = 0; i < scb->sg_count; i++) {
1400 
1401 				printk("sg[%d] - Addr 0x%x%x : Length %d\n",
1402 				       i,
1403 				       (ahc_le32toh(scb->sg_list[i].len) >> 24
1404 					& SG_HIGH_ADDR_BITS),
1405 				       ahc_le32toh(scb->sg_list[i].addr),
1406 				       ahc_le32toh(scb->sg_list[i].len)
1407 				       & AHC_SG_LEN_MASK);
1408 			}
1409 		}
1410 		/*
1411 		 * Set this and it will take effect when the
1412 		 * target does a command complete.
1413 		 */
1414 		ahc_freeze_devq(ahc, scb);
1415 		if ((scb->flags & SCB_SENSE) == 0) {
1416 			ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1417 		} else {
1418 			scb->flags &= ~SCB_SENSE;
1419 			ahc_set_transaction_status(scb, CAM_AUTOSENSE_FAIL);
1420 		}
1421 		ahc_freeze_scb(scb);
1422 
1423 		if ((ahc->features & AHC_ULTRA2) != 0) {
1424 			/*
1425 			 * Clear the channel in case we return
1426 			 * to data phase later.
1427 			 */
1428 			ahc_outb(ahc, SXFRCTL0,
1429 				 ahc_inb(ahc, SXFRCTL0) | CLRSTCNT|CLRCHN);
1430 			ahc_outb(ahc, SXFRCTL0,
1431 				 ahc_inb(ahc, SXFRCTL0) | CLRSTCNT|CLRCHN);
1432 		}
1433 		if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
1434 			u_int dscommand1;
1435 
1436 			/* Ensure HHADDR is 0 for future DMA operations. */
1437 			dscommand1 = ahc_inb(ahc, DSCOMMAND1);
1438 			ahc_outb(ahc, DSCOMMAND1, dscommand1 | HADDLDSEL0);
1439 			ahc_outb(ahc, HADDR, 0);
1440 			ahc_outb(ahc, DSCOMMAND1, dscommand1);
1441 		}
1442 		break;
1443 	}
1444 	case MKMSG_FAILED:
1445 	{
1446 		u_int scbindex;
1447 
1448 		printk("%s:%c:%d:%d: Attempt to issue message failed\n",
1449 		       ahc_name(ahc), devinfo.channel, devinfo.target,
1450 		       devinfo.lun);
1451 		scbindex = ahc_inb(ahc, SCB_TAG);
1452 		scb = ahc_lookup_scb(ahc, scbindex);
1453 		if (scb != NULL
1454 		 && (scb->flags & SCB_RECOVERY_SCB) != 0)
1455 			/*
1456 			 * Ensure that we didn't put a second instance of this
1457 			 * SCB into the QINFIFO.
1458 			 */
1459 			ahc_search_qinfifo(ahc, SCB_GET_TARGET(ahc, scb),
1460 					   SCB_GET_CHANNEL(ahc, scb),
1461 					   SCB_GET_LUN(scb), scb->hscb->tag,
1462 					   ROLE_INITIATOR, /*status*/0,
1463 					   SEARCH_REMOVE);
1464 		break;
1465 	}
1466 	case NO_FREE_SCB:
1467 	{
1468 		printk("%s: No free or disconnected SCBs\n", ahc_name(ahc));
1469 		ahc_dump_card_state(ahc);
1470 		panic("for safety");
1471 		break;
1472 	}
1473 	case SCB_MISMATCH:
1474 	{
1475 		u_int scbptr;
1476 
1477 		scbptr = ahc_inb(ahc, SCBPTR);
1478 		printk("Bogus TAG after DMA.  SCBPTR %d, tag %d, our tag %d\n",
1479 		       scbptr, ahc_inb(ahc, ARG_1),
1480 		       ahc->scb_data->hscbs[scbptr].tag);
1481 		ahc_dump_card_state(ahc);
1482 		panic("for safety");
1483 		break;
1484 	}
1485 	case OUT_OF_RANGE:
1486 	{
1487 		printk("%s: BTT calculation out of range\n", ahc_name(ahc));
1488 		printk("SAVED_SCSIID == 0x%x, SAVED_LUN == 0x%x, "
1489 		       "ARG_1 == 0x%x ACCUM = 0x%x\n",
1490 		       ahc_inb(ahc, SAVED_SCSIID), ahc_inb(ahc, SAVED_LUN),
1491 		       ahc_inb(ahc, ARG_1), ahc_inb(ahc, ACCUM));
1492 		printk("SEQ_FLAGS == 0x%x, SCBPTR == 0x%x, BTT == 0x%x, "
1493 		       "SINDEX == 0x%x\n, A == 0x%x\n",
1494 		       ahc_inb(ahc, SEQ_FLAGS), ahc_inb(ahc, SCBPTR),
1495 		       ahc_index_busy_tcl(ahc,
1496 			    BUILD_TCL(ahc_inb(ahc, SAVED_SCSIID),
1497 				      ahc_inb(ahc, SAVED_LUN))),
1498 		       ahc_inb(ahc, SINDEX),
1499 		       ahc_inb(ahc, ACCUM));
1500 		printk("SCSIID == 0x%x, SCB_SCSIID == 0x%x, SCB_LUN == 0x%x, "
1501 		       "SCB_TAG == 0x%x, SCB_CONTROL == 0x%x\n",
1502 		       ahc_inb(ahc, SCSIID), ahc_inb(ahc, SCB_SCSIID),
1503 		       ahc_inb(ahc, SCB_LUN), ahc_inb(ahc, SCB_TAG),
1504 		       ahc_inb(ahc, SCB_CONTROL));
1505 		printk("SCSIBUSL == 0x%x, SCSISIGI == 0x%x\n",
1506 		       ahc_inb(ahc, SCSIBUSL), ahc_inb(ahc, SCSISIGI));
1507 		ahc_dump_card_state(ahc);
1508 		panic("for safety");
1509 		break;
1510 	}
1511 	default:
1512 		printk("ahc_intr: seqint, "
1513 		       "intstat == 0x%x, scsisigi = 0x%x\n",
1514 		       intstat, ahc_inb(ahc, SCSISIGI));
1515 		break;
1516 	}
1517 unpause:
1518 	/*
1519 	 *  The sequencer is paused immediately on
1520 	 *  a SEQINT, so we should restart it when
1521 	 *  we're done.
1522 	 */
1523 	ahc_unpause(ahc);
1524 }
1525 
1526 static void
1527 ahc_handle_scsiint(struct ahc_softc *ahc, u_int intstat)
1528 {
1529 	u_int	scb_index;
1530 	u_int	status0;
1531 	u_int	status;
1532 	struct	scb *scb;
1533 	char	cur_channel;
1534 	char	intr_channel;
1535 
1536 	if ((ahc->features & AHC_TWIN) != 0
1537 	 && ((ahc_inb(ahc, SBLKCTL) & SELBUSB) != 0))
1538 		cur_channel = 'B';
1539 	else
1540 		cur_channel = 'A';
1541 	intr_channel = cur_channel;
1542 
1543 	if ((ahc->features & AHC_ULTRA2) != 0)
1544 		status0 = ahc_inb(ahc, SSTAT0) & IOERR;
1545 	else
1546 		status0 = 0;
1547 	status = ahc_inb(ahc, SSTAT1) & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
1548 	if (status == 0 && status0 == 0) {
1549 		if ((ahc->features & AHC_TWIN) != 0) {
1550 			/* Try the other channel */
1551 			ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) ^ SELBUSB);
1552 			status = ahc_inb(ahc, SSTAT1)
1553 			       & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
1554 			intr_channel = (cur_channel == 'A') ? 'B' : 'A';
1555 		}
1556 		if (status == 0) {
1557 			printk("%s: Spurious SCSI interrupt\n", ahc_name(ahc));
1558 			ahc_outb(ahc, CLRINT, CLRSCSIINT);
1559 			ahc_unpause(ahc);
1560 			return;
1561 		}
1562 	}
1563 
1564 	/* Make sure the sequencer is in a safe location. */
1565 	ahc_clear_critical_section(ahc);
1566 
1567 	scb_index = ahc_inb(ahc, SCB_TAG);
1568 	scb = ahc_lookup_scb(ahc, scb_index);
1569 	if (scb != NULL
1570 	 && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
1571 		scb = NULL;
1572 
1573 	if ((ahc->features & AHC_ULTRA2) != 0
1574 	 && (status0 & IOERR) != 0) {
1575 		int now_lvd;
1576 
1577 		now_lvd = ahc_inb(ahc, SBLKCTL) & ENAB40;
1578 		printk("%s: Transceiver State Has Changed to %s mode\n",
1579 		       ahc_name(ahc), now_lvd ? "LVD" : "SE");
1580 		ahc_outb(ahc, CLRSINT0, CLRIOERR);
1581 		/*
1582 		 * When transitioning to SE mode, the reset line
1583 		 * glitches, triggering an arbitration bug in some
1584 		 * Ultra2 controllers.  This bug is cleared when we
1585 		 * assert the reset line.  Since a reset glitch has
1586 		 * already occurred with this transition and a
1587 		 * transceiver state change is handled just like
1588 		 * a bus reset anyway, asserting the reset line
1589 		 * ourselves is safe.
1590 		 */
1591 		ahc_reset_channel(ahc, intr_channel,
1592 				 /*Initiate Reset*/now_lvd == 0);
1593 	} else if ((status & SCSIRSTI) != 0) {
1594 		printk("%s: Someone reset channel %c\n",
1595 			ahc_name(ahc), intr_channel);
1596 		if (intr_channel != cur_channel)
1597 			ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) ^ SELBUSB);
1598 		ahc_reset_channel(ahc, intr_channel, /*Initiate Reset*/FALSE);
1599 	} else if ((status & SCSIPERR) != 0) {
1600 		/*
1601 		 * Determine the bus phase and queue an appropriate message.
1602 		 * SCSIPERR is latched true as soon as a parity error
1603 		 * occurs.  If the sequencer acked the transfer that
1604 		 * caused the parity error and the currently presented
1605 		 * transfer on the bus has correct parity, SCSIPERR will
1606 		 * be cleared by CLRSCSIPERR.  Use this to determine if
1607 		 * we should look at the last phase the sequencer recorded,
1608 		 * or the current phase presented on the bus.
1609 		 */
1610 		struct	ahc_devinfo devinfo;
1611 		u_int	mesg_out;
1612 		u_int	curphase;
1613 		u_int	errorphase;
1614 		u_int	lastphase;
1615 		u_int	scsirate;
1616 		u_int	i;
1617 		u_int	sstat2;
1618 		int	silent;
1619 
1620 		lastphase = ahc_inb(ahc, LASTPHASE);
1621 		curphase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
1622 		sstat2 = ahc_inb(ahc, SSTAT2);
1623 		ahc_outb(ahc, CLRSINT1, CLRSCSIPERR);
1624 		/*
1625 		 * For all phases save DATA, the sequencer won't
1626 		 * automatically ack a byte that has a parity error
1627 		 * in it.  So the only way that the current phase
1628 		 * could be 'data-in' is if the parity error is for
1629 		 * an already acked byte in the data phase.  During
1630 		 * synchronous data-in transfers, we may actually
1631 		 * ack bytes before latching the current phase in
1632 		 * LASTPHASE, leading to the discrepancy between
1633 		 * curphase and lastphase.
1634 		 */
1635 		if ((ahc_inb(ahc, SSTAT1) & SCSIPERR) != 0
1636 		 || curphase == P_DATAIN || curphase == P_DATAIN_DT)
1637 			errorphase = curphase;
1638 		else
1639 			errorphase = lastphase;
1640 
1641 		for (i = 0; i < num_phases; i++) {
1642 			if (errorphase == ahc_phase_table[i].phase)
1643 				break;
1644 		}
1645 		mesg_out = ahc_phase_table[i].mesg_out;
1646 		silent = FALSE;
1647 		if (scb != NULL) {
1648 			if (SCB_IS_SILENT(scb))
1649 				silent = TRUE;
1650 			else
1651 				ahc_print_path(ahc, scb);
1652 			scb->flags |= SCB_TRANSMISSION_ERROR;
1653 		} else
1654 			printk("%s:%c:%d: ", ahc_name(ahc), intr_channel,
1655 			       SCSIID_TARGET(ahc, ahc_inb(ahc, SAVED_SCSIID)));
1656 		scsirate = ahc_inb(ahc, SCSIRATE);
1657 		if (silent == FALSE) {
1658 			printk("parity error detected %s. "
1659 			       "SEQADDR(0x%x) SCSIRATE(0x%x)\n",
1660 			       ahc_phase_table[i].phasemsg,
1661 			       ahc_inw(ahc, SEQADDR0),
1662 			       scsirate);
1663 			if ((ahc->features & AHC_DT) != 0) {
1664 				if ((sstat2 & CRCVALERR) != 0)
1665 					printk("\tCRC Value Mismatch\n");
1666 				if ((sstat2 & CRCENDERR) != 0)
1667 					printk("\tNo terminal CRC packet "
1668 					       "received\n");
1669 				if ((sstat2 & CRCREQERR) != 0)
1670 					printk("\tIllegal CRC packet "
1671 					       "request\n");
1672 				if ((sstat2 & DUAL_EDGE_ERR) != 0)
1673 					printk("\tUnexpected %sDT Data Phase\n",
1674 					       (scsirate & SINGLE_EDGE)
1675 					     ? "" : "non-");
1676 			}
1677 		}
1678 
1679 		if ((ahc->features & AHC_DT) != 0
1680 		 && (sstat2 & DUAL_EDGE_ERR) != 0) {
1681 			/*
1682 			 * This error applies regardless of
1683 			 * data direction, so ignore the value
1684 			 * in the phase table.
1685 			 */
1686 			mesg_out = INITIATOR_ERROR;
1687 		}
1688 
1689 		/*
1690 		 * We've set the hardware to assert ATN if we
1691 		 * get a parity error on "in" phases, so all we
1692 		 * need to do is stuff the message buffer with
1693 		 * the appropriate message.  "In" phases have set
1694 		 * mesg_out to something other than MSG_NOP.
1695 		 */
1696 		if (mesg_out != NOP) {
1697 			if (ahc->msg_type != MSG_TYPE_NONE)
1698 				ahc->send_msg_perror = TRUE;
1699 			else
1700 				ahc_outb(ahc, MSG_OUT, mesg_out);
1701 		}
1702 		/*
1703 		 * Force a renegotiation with this target just in
1704 		 * case we are out of sync for some external reason
1705 		 * unknown (or unreported) by the target.
1706 		 */
1707 		ahc_fetch_devinfo(ahc, &devinfo);
1708 		ahc_force_renegotiation(ahc, &devinfo);
1709 
1710 		ahc_outb(ahc, CLRINT, CLRSCSIINT);
1711 		ahc_unpause(ahc);
1712 	} else if ((status & SELTO) != 0) {
1713 		u_int	scbptr;
1714 
1715 		/* Stop the selection */
1716 		ahc_outb(ahc, SCSISEQ, 0);
1717 
1718 		/* No more pending messages */
1719 		ahc_clear_msg_state(ahc);
1720 
1721 		/* Clear interrupt state */
1722 		ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) & ~ENBUSFREE);
1723 		ahc_outb(ahc, CLRSINT1, CLRSELTIMEO|CLRBUSFREE|CLRSCSIPERR);
1724 
1725 		/*
1726 		 * Although the driver does not care about the
1727 		 * 'Selection in Progress' status bit, the busy
1728 		 * LED does.  SELINGO is only cleared by a successful
1729 		 * selection, so we must manually clear it to insure
1730 		 * the LED turns off just incase no future successful
1731 		 * selections occur (e.g. no devices on the bus).
1732 		 */
1733 		ahc_outb(ahc, CLRSINT0, CLRSELINGO);
1734 
1735 		scbptr = ahc_inb(ahc, WAITING_SCBH);
1736 		ahc_outb(ahc, SCBPTR, scbptr);
1737 		scb_index = ahc_inb(ahc, SCB_TAG);
1738 
1739 		scb = ahc_lookup_scb(ahc, scb_index);
1740 		if (scb == NULL) {
1741 			printk("%s: ahc_intr - referenced scb not "
1742 			       "valid during SELTO scb(%d, %d)\n",
1743 			       ahc_name(ahc), scbptr, scb_index);
1744 			ahc_dump_card_state(ahc);
1745 		} else {
1746 			struct ahc_devinfo devinfo;
1747 #ifdef AHC_DEBUG
1748 			if ((ahc_debug & AHC_SHOW_SELTO) != 0) {
1749 				ahc_print_path(ahc, scb);
1750 				printk("Saw Selection Timeout for SCB 0x%x\n",
1751 				       scb_index);
1752 			}
1753 #endif
1754 			ahc_scb_devinfo(ahc, &devinfo, scb);
1755 			ahc_set_transaction_status(scb, CAM_SEL_TIMEOUT);
1756 			ahc_freeze_devq(ahc, scb);
1757 
1758 			/*
1759 			 * Cancel any pending transactions on the device
1760 			 * now that it seems to be missing.  This will
1761 			 * also revert us to async/narrow transfers until
1762 			 * we can renegotiate with the device.
1763 			 */
1764 			ahc_handle_devreset(ahc, &devinfo,
1765 					    CAM_SEL_TIMEOUT,
1766 					    "Selection Timeout",
1767 					    /*verbose_level*/1);
1768 		}
1769 		ahc_outb(ahc, CLRINT, CLRSCSIINT);
1770 		ahc_restart(ahc);
1771 	} else if ((status & BUSFREE) != 0
1772 		&& (ahc_inb(ahc, SIMODE1) & ENBUSFREE) != 0) {
1773 		struct	ahc_devinfo devinfo;
1774 		u_int	lastphase;
1775 		u_int	saved_scsiid;
1776 		u_int	saved_lun;
1777 		u_int	target;
1778 		u_int	initiator_role_id;
1779 		char	channel;
1780 		int	printerror;
1781 
1782 		/*
1783 		 * Clear our selection hardware as soon as possible.
1784 		 * We may have an entry in the waiting Q for this target,
1785 		 * that is affected by this busfree and we don't want to
1786 		 * go about selecting the target while we handle the event.
1787 		 */
1788 		ahc_outb(ahc, SCSISEQ,
1789 			 ahc_inb(ahc, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP));
1790 
1791 		/*
1792 		 * Disable busfree interrupts and clear the busfree
1793 		 * interrupt status.  We do this here so that several
1794 		 * bus transactions occur prior to clearing the SCSIINT
1795 		 * latch.  It can take a bit for the clearing to take effect.
1796 		 */
1797 		ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) & ~ENBUSFREE);
1798 		ahc_outb(ahc, CLRSINT1, CLRBUSFREE|CLRSCSIPERR);
1799 
1800 		/*
1801 		 * Look at what phase we were last in.
1802 		 * If its message out, chances are pretty good
1803 		 * that the busfree was in response to one of
1804 		 * our abort requests.
1805 		 */
1806 		lastphase = ahc_inb(ahc, LASTPHASE);
1807 		saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
1808 		saved_lun = ahc_inb(ahc, SAVED_LUN);
1809 		target = SCSIID_TARGET(ahc, saved_scsiid);
1810 		initiator_role_id = SCSIID_OUR_ID(saved_scsiid);
1811 		channel = SCSIID_CHANNEL(ahc, saved_scsiid);
1812 		ahc_compile_devinfo(&devinfo, initiator_role_id,
1813 				    target, saved_lun, channel, ROLE_INITIATOR);
1814 		printerror = 1;
1815 
1816 		if (lastphase == P_MESGOUT) {
1817 			u_int tag;
1818 
1819 			tag = SCB_LIST_NULL;
1820 			if (ahc_sent_msg(ahc, AHCMSG_1B, ABORT_TASK, TRUE)
1821 			 || ahc_sent_msg(ahc, AHCMSG_1B, ABORT_TASK_SET, TRUE)) {
1822 				if (ahc->msgout_buf[ahc->msgout_index - 1]
1823 				 == ABORT_TASK)
1824 					tag = scb->hscb->tag;
1825 				ahc_print_path(ahc, scb);
1826 				printk("SCB %d - Abort%s Completed.\n",
1827 				       scb->hscb->tag, tag == SCB_LIST_NULL ?
1828 				       "" : " Tag");
1829 				ahc_abort_scbs(ahc, target, channel,
1830 					       saved_lun, tag,
1831 					       ROLE_INITIATOR,
1832 					       CAM_REQ_ABORTED);
1833 				printerror = 0;
1834 			} else if (ahc_sent_msg(ahc, AHCMSG_1B,
1835 						TARGET_RESET, TRUE)) {
1836 				ahc_compile_devinfo(&devinfo,
1837 						    initiator_role_id,
1838 						    target,
1839 						    CAM_LUN_WILDCARD,
1840 						    channel,
1841 						    ROLE_INITIATOR);
1842 				ahc_handle_devreset(ahc, &devinfo,
1843 						    CAM_BDR_SENT,
1844 						    "Bus Device Reset",
1845 						    /*verbose_level*/0);
1846 				printerror = 0;
1847 			} else if (ahc_sent_msg(ahc, AHCMSG_EXT,
1848 						EXTENDED_PPR, FALSE)) {
1849 				struct ahc_initiator_tinfo *tinfo;
1850 				struct ahc_tmode_tstate *tstate;
1851 
1852 				/*
1853 				 * PPR Rejected.  Try non-ppr negotiation
1854 				 * and retry command.
1855 				 */
1856 				tinfo = ahc_fetch_transinfo(ahc,
1857 							    devinfo.channel,
1858 							    devinfo.our_scsiid,
1859 							    devinfo.target,
1860 							    &tstate);
1861 				tinfo->curr.transport_version = 2;
1862 				tinfo->goal.transport_version = 2;
1863 				tinfo->goal.ppr_options = 0;
1864 				ahc_qinfifo_requeue_tail(ahc, scb);
1865 				printerror = 0;
1866 			} else if (ahc_sent_msg(ahc, AHCMSG_EXT,
1867 						EXTENDED_WDTR, FALSE)) {
1868 				/*
1869 				 * Negotiation Rejected.  Go-narrow and
1870 				 * retry command.
1871 				 */
1872 				ahc_set_width(ahc, &devinfo,
1873 					      MSG_EXT_WDTR_BUS_8_BIT,
1874 					      AHC_TRANS_CUR|AHC_TRANS_GOAL,
1875 					      /*paused*/TRUE);
1876 				ahc_qinfifo_requeue_tail(ahc, scb);
1877 				printerror = 0;
1878 			} else if (ahc_sent_msg(ahc, AHCMSG_EXT,
1879 						EXTENDED_SDTR, FALSE)) {
1880 				/*
1881 				 * Negotiation Rejected.  Go-async and
1882 				 * retry command.
1883 				 */
1884 				ahc_set_syncrate(ahc, &devinfo,
1885 						/*syncrate*/NULL,
1886 						/*period*/0, /*offset*/0,
1887 						/*ppr_options*/0,
1888 						AHC_TRANS_CUR|AHC_TRANS_GOAL,
1889 						/*paused*/TRUE);
1890 				ahc_qinfifo_requeue_tail(ahc, scb);
1891 				printerror = 0;
1892 			}
1893 		}
1894 		if (printerror != 0) {
1895 			u_int i;
1896 
1897 			if (scb != NULL) {
1898 				u_int tag;
1899 
1900 				if ((scb->hscb->control & TAG_ENB) != 0)
1901 					tag = scb->hscb->tag;
1902 				else
1903 					tag = SCB_LIST_NULL;
1904 				ahc_print_path(ahc, scb);
1905 				ahc_abort_scbs(ahc, target, channel,
1906 					       SCB_GET_LUN(scb), tag,
1907 					       ROLE_INITIATOR,
1908 					       CAM_UNEXP_BUSFREE);
1909 			} else {
1910 				/*
1911 				 * We had not fully identified this connection,
1912 				 * so we cannot abort anything.
1913 				 */
1914 				printk("%s: ", ahc_name(ahc));
1915 			}
1916 			for (i = 0; i < num_phases; i++) {
1917 				if (lastphase == ahc_phase_table[i].phase)
1918 					break;
1919 			}
1920 			if (lastphase != P_BUSFREE) {
1921 				/*
1922 				 * Renegotiate with this device at the
1923 				 * next opportunity just in case this busfree
1924 				 * is due to a negotiation mismatch with the
1925 				 * device.
1926 				 */
1927 				ahc_force_renegotiation(ahc, &devinfo);
1928 			}
1929 			printk("Unexpected busfree %s\n"
1930 			       "SEQADDR == 0x%x\n",
1931 			       ahc_phase_table[i].phasemsg,
1932 			       ahc_inb(ahc, SEQADDR0)
1933 				| (ahc_inb(ahc, SEQADDR1) << 8));
1934 		}
1935 		ahc_outb(ahc, CLRINT, CLRSCSIINT);
1936 		ahc_restart(ahc);
1937 	} else {
1938 		printk("%s: Missing case in ahc_handle_scsiint. status = %x\n",
1939 		       ahc_name(ahc), status);
1940 		ahc_outb(ahc, CLRINT, CLRSCSIINT);
1941 	}
1942 }
1943 
1944 /*
1945  * Force renegotiation to occur the next time we initiate
1946  * a command to the current device.
1947  */
1948 static void
1949 ahc_force_renegotiation(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1950 {
1951 	struct	ahc_initiator_tinfo *targ_info;
1952 	struct	ahc_tmode_tstate *tstate;
1953 
1954 	targ_info = ahc_fetch_transinfo(ahc,
1955 					devinfo->channel,
1956 					devinfo->our_scsiid,
1957 					devinfo->target,
1958 					&tstate);
1959 	ahc_update_neg_request(ahc, devinfo, tstate,
1960 			       targ_info, AHC_NEG_IF_NON_ASYNC);
1961 }
1962 
1963 #define AHC_MAX_STEPS 2000
1964 static void
1965 ahc_clear_critical_section(struct ahc_softc *ahc)
1966 {
1967 	int	stepping;
1968 	int	steps;
1969 	u_int	simode0;
1970 	u_int	simode1;
1971 
1972 	if (ahc->num_critical_sections == 0)
1973 		return;
1974 
1975 	stepping = FALSE;
1976 	steps = 0;
1977 	simode0 = 0;
1978 	simode1 = 0;
1979 	for (;;) {
1980 		struct	cs *cs;
1981 		u_int	seqaddr;
1982 		u_int	i;
1983 
1984 		seqaddr = ahc_inb(ahc, SEQADDR0)
1985 			| (ahc_inb(ahc, SEQADDR1) << 8);
1986 
1987 		/*
1988 		 * Seqaddr represents the next instruction to execute,
1989 		 * so we are really executing the instruction just
1990 		 * before it.
1991 		 */
1992 		if (seqaddr != 0)
1993 			seqaddr -= 1;
1994 		cs = ahc->critical_sections;
1995 		for (i = 0; i < ahc->num_critical_sections; i++, cs++) {
1996 			if (cs->begin < seqaddr && cs->end >= seqaddr)
1997 				break;
1998 		}
1999 
2000 		if (i == ahc->num_critical_sections)
2001 			break;
2002 
2003 		if (steps > AHC_MAX_STEPS) {
2004 			printk("%s: Infinite loop in critical section\n",
2005 			       ahc_name(ahc));
2006 			ahc_dump_card_state(ahc);
2007 			panic("critical section loop");
2008 		}
2009 
2010 		steps++;
2011 		if (stepping == FALSE) {
2012 
2013 			/*
2014 			 * Disable all interrupt sources so that the
2015 			 * sequencer will not be stuck by a pausing
2016 			 * interrupt condition while we attempt to
2017 			 * leave a critical section.
2018 			 */
2019 			simode0 = ahc_inb(ahc, SIMODE0);
2020 			ahc_outb(ahc, SIMODE0, 0);
2021 			simode1 = ahc_inb(ahc, SIMODE1);
2022 			if ((ahc->features & AHC_DT) != 0)
2023 				/*
2024 				 * On DT class controllers, we
2025 				 * use the enhanced busfree logic.
2026 				 * Unfortunately we cannot re-enable
2027 				 * busfree detection within the
2028 				 * current connection, so we must
2029 				 * leave it on while single stepping.
2030 				 */
2031 				ahc_outb(ahc, SIMODE1, simode1 & ENBUSFREE);
2032 			else
2033 				ahc_outb(ahc, SIMODE1, 0);
2034 			ahc_outb(ahc, CLRINT, CLRSCSIINT);
2035 			ahc_outb(ahc, SEQCTL, ahc->seqctl | STEP);
2036 			stepping = TRUE;
2037 		}
2038 		if ((ahc->features & AHC_DT) != 0) {
2039 			ahc_outb(ahc, CLRSINT1, CLRBUSFREE);
2040 			ahc_outb(ahc, CLRINT, CLRSCSIINT);
2041 		}
2042 		ahc_outb(ahc, HCNTRL, ahc->unpause);
2043 		while (!ahc_is_paused(ahc))
2044 			ahc_delay(200);
2045 	}
2046 	if (stepping) {
2047 		ahc_outb(ahc, SIMODE0, simode0);
2048 		ahc_outb(ahc, SIMODE1, simode1);
2049 		ahc_outb(ahc, SEQCTL, ahc->seqctl);
2050 	}
2051 }
2052 
2053 /*
2054  * Clear any pending interrupt status.
2055  */
2056 static void
2057 ahc_clear_intstat(struct ahc_softc *ahc)
2058 {
2059 	/* Clear any interrupt conditions this may have caused */
2060 	ahc_outb(ahc, CLRSINT1, CLRSELTIMEO|CLRATNO|CLRSCSIRSTI
2061 				|CLRBUSFREE|CLRSCSIPERR|CLRPHASECHG|
2062 				CLRREQINIT);
2063 	ahc_flush_device_writes(ahc);
2064 	ahc_outb(ahc, CLRSINT0, CLRSELDO|CLRSELDI|CLRSELINGO);
2065 	ahc_flush_device_writes(ahc);
2066 	ahc_outb(ahc, CLRINT, CLRSCSIINT);
2067 	ahc_flush_device_writes(ahc);
2068 }
2069 
2070 /**************************** Debugging Routines ******************************/
2071 #ifdef AHC_DEBUG
2072 uint32_t ahc_debug = AHC_DEBUG_OPTS;
2073 #endif
2074 
2075 #if 0 /* unused */
2076 static void
2077 ahc_print_scb(struct scb *scb)
2078 {
2079 	int i;
2080 
2081 	struct hardware_scb *hscb = scb->hscb;
2082 
2083 	printk("scb:%p control:0x%x scsiid:0x%x lun:%d cdb_len:%d\n",
2084 	       (void *)scb,
2085 	       hscb->control,
2086 	       hscb->scsiid,
2087 	       hscb->lun,
2088 	       hscb->cdb_len);
2089 	printk("Shared Data: ");
2090 	for (i = 0; i < sizeof(hscb->shared_data.cdb); i++)
2091 		printk("%#02x", hscb->shared_data.cdb[i]);
2092 	printk("        dataptr:%#x datacnt:%#x sgptr:%#x tag:%#x\n",
2093 		ahc_le32toh(hscb->dataptr),
2094 		ahc_le32toh(hscb->datacnt),
2095 		ahc_le32toh(hscb->sgptr),
2096 		hscb->tag);
2097 	if (scb->sg_count > 0) {
2098 		for (i = 0; i < scb->sg_count; i++) {
2099 			printk("sg[%d] - Addr 0x%x%x : Length %d\n",
2100 			       i,
2101 			       (ahc_le32toh(scb->sg_list[i].len) >> 24
2102 				& SG_HIGH_ADDR_BITS),
2103 			       ahc_le32toh(scb->sg_list[i].addr),
2104 			       ahc_le32toh(scb->sg_list[i].len));
2105 		}
2106 	}
2107 }
2108 #endif
2109 
2110 /************************* Transfer Negotiation *******************************/
2111 /*
2112  * Allocate per target mode instance (ID we respond to as a target)
2113  * transfer negotiation data structures.
2114  */
2115 static struct ahc_tmode_tstate *
2116 ahc_alloc_tstate(struct ahc_softc *ahc, u_int scsi_id, char channel)
2117 {
2118 	struct ahc_tmode_tstate *master_tstate;
2119 	struct ahc_tmode_tstate *tstate;
2120 	int i;
2121 
2122 	master_tstate = ahc->enabled_targets[ahc->our_id];
2123 	if (channel == 'B') {
2124 		scsi_id += 8;
2125 		master_tstate = ahc->enabled_targets[ahc->our_id_b + 8];
2126 	}
2127 	if (ahc->enabled_targets[scsi_id] != NULL
2128 	 && ahc->enabled_targets[scsi_id] != master_tstate)
2129 		panic("%s: ahc_alloc_tstate - Target already allocated",
2130 		      ahc_name(ahc));
2131 	tstate = kmalloc(sizeof(*tstate), GFP_ATOMIC);
2132 	if (tstate == NULL)
2133 		return (NULL);
2134 
2135 	/*
2136 	 * If we have allocated a master tstate, copy user settings from
2137 	 * the master tstate (taken from SRAM or the EEPROM) for this
2138 	 * channel, but reset our current and goal settings to async/narrow
2139 	 * until an initiator talks to us.
2140 	 */
2141 	if (master_tstate != NULL) {
2142 		memcpy(tstate, master_tstate, sizeof(*tstate));
2143 		memset(tstate->enabled_luns, 0, sizeof(tstate->enabled_luns));
2144 		tstate->ultraenb = 0;
2145 		for (i = 0; i < AHC_NUM_TARGETS; i++) {
2146 			memset(&tstate->transinfo[i].curr, 0,
2147 			      sizeof(tstate->transinfo[i].curr));
2148 			memset(&tstate->transinfo[i].goal, 0,
2149 			      sizeof(tstate->transinfo[i].goal));
2150 		}
2151 	} else
2152 		memset(tstate, 0, sizeof(*tstate));
2153 	ahc->enabled_targets[scsi_id] = tstate;
2154 	return (tstate);
2155 }
2156 
2157 #ifdef AHC_TARGET_MODE
2158 /*
2159  * Free per target mode instance (ID we respond to as a target)
2160  * transfer negotiation data structures.
2161  */
2162 static void
2163 ahc_free_tstate(struct ahc_softc *ahc, u_int scsi_id, char channel, int force)
2164 {
2165 	struct ahc_tmode_tstate *tstate;
2166 
2167 	/*
2168 	 * Don't clean up our "master" tstate.
2169 	 * It has our default user settings.
2170 	 */
2171 	if (((channel == 'B' && scsi_id == ahc->our_id_b)
2172 	  || (channel == 'A' && scsi_id == ahc->our_id))
2173 	 && force == FALSE)
2174 		return;
2175 
2176 	if (channel == 'B')
2177 		scsi_id += 8;
2178 	tstate = ahc->enabled_targets[scsi_id];
2179 	kfree(tstate);
2180 	ahc->enabled_targets[scsi_id] = NULL;
2181 }
2182 #endif
2183 
2184 /*
2185  * Called when we have an active connection to a target on the bus,
2186  * this function finds the nearest syncrate to the input period limited
2187  * by the capabilities of the bus connectivity of and sync settings for
2188  * the target.
2189  */
2190 static const struct ahc_syncrate *
2191 ahc_devlimited_syncrate(struct ahc_softc *ahc,
2192 			struct ahc_initiator_tinfo *tinfo,
2193 			u_int *period, u_int *ppr_options, role_t role)
2194 {
2195 	struct	ahc_transinfo *transinfo;
2196 	u_int	maxsync;
2197 
2198 	if ((ahc->features & AHC_ULTRA2) != 0) {
2199 		if ((ahc_inb(ahc, SBLKCTL) & ENAB40) != 0
2200 		 && (ahc_inb(ahc, SSTAT2) & EXP_ACTIVE) == 0) {
2201 			maxsync = AHC_SYNCRATE_DT;
2202 		} else {
2203 			maxsync = AHC_SYNCRATE_ULTRA;
2204 			/* Can't do DT on an SE bus */
2205 			*ppr_options &= ~MSG_EXT_PPR_DT_REQ;
2206 		}
2207 	} else if ((ahc->features & AHC_ULTRA) != 0) {
2208 		maxsync = AHC_SYNCRATE_ULTRA;
2209 	} else {
2210 		maxsync = AHC_SYNCRATE_FAST;
2211 	}
2212 	/*
2213 	 * Never allow a value higher than our current goal
2214 	 * period otherwise we may allow a target initiated
2215 	 * negotiation to go above the limit as set by the
2216 	 * user.  In the case of an initiator initiated
2217 	 * sync negotiation, we limit based on the user
2218 	 * setting.  This allows the system to still accept
2219 	 * incoming negotiations even if target initiated
2220 	 * negotiation is not performed.
2221 	 */
2222 	if (role == ROLE_TARGET)
2223 		transinfo = &tinfo->user;
2224 	else
2225 		transinfo = &tinfo->goal;
2226 	*ppr_options &= transinfo->ppr_options;
2227 	if (transinfo->width == MSG_EXT_WDTR_BUS_8_BIT) {
2228 		maxsync = max(maxsync, (u_int)AHC_SYNCRATE_ULTRA2);
2229 		*ppr_options &= ~MSG_EXT_PPR_DT_REQ;
2230 	}
2231 	if (transinfo->period == 0) {
2232 		*period = 0;
2233 		*ppr_options = 0;
2234 		return (NULL);
2235 	}
2236 	*period = max(*period, (u_int)transinfo->period);
2237 	return (ahc_find_syncrate(ahc, period, ppr_options, maxsync));
2238 }
2239 
2240 /*
2241  * Look up the valid period to SCSIRATE conversion in our table.
2242  * Return the period and offset that should be sent to the target
2243  * if this was the beginning of an SDTR.
2244  */
2245 const struct ahc_syncrate *
2246 ahc_find_syncrate(struct ahc_softc *ahc, u_int *period,
2247 		  u_int *ppr_options, u_int maxsync)
2248 {
2249 	const struct ahc_syncrate *syncrate;
2250 
2251 	if ((ahc->features & AHC_DT) == 0)
2252 		*ppr_options &= ~MSG_EXT_PPR_DT_REQ;
2253 
2254 	/* Skip all DT only entries if DT is not available */
2255 	if ((*ppr_options & MSG_EXT_PPR_DT_REQ) == 0
2256 	 && maxsync < AHC_SYNCRATE_ULTRA2)
2257 		maxsync = AHC_SYNCRATE_ULTRA2;
2258 
2259 	/* Now set the maxsync based on the card capabilities
2260 	 * DT is already done above */
2261 	if ((ahc->features & (AHC_DT | AHC_ULTRA2)) == 0
2262 	    && maxsync < AHC_SYNCRATE_ULTRA)
2263 		maxsync = AHC_SYNCRATE_ULTRA;
2264 	if ((ahc->features & (AHC_DT | AHC_ULTRA2 | AHC_ULTRA)) == 0
2265 	    && maxsync < AHC_SYNCRATE_FAST)
2266 		maxsync = AHC_SYNCRATE_FAST;
2267 
2268 	for (syncrate = &ahc_syncrates[maxsync];
2269 	     syncrate->rate != NULL;
2270 	     syncrate++) {
2271 
2272 		/*
2273 		 * The Ultra2 table doesn't go as low
2274 		 * as for the Fast/Ultra cards.
2275 		 */
2276 		if ((ahc->features & AHC_ULTRA2) != 0
2277 		 && (syncrate->sxfr_u2 == 0))
2278 			break;
2279 
2280 		if (*period <= syncrate->period) {
2281 			/*
2282 			 * When responding to a target that requests
2283 			 * sync, the requested rate may fall between
2284 			 * two rates that we can output, but still be
2285 			 * a rate that we can receive.  Because of this,
2286 			 * we want to respond to the target with
2287 			 * the same rate that it sent to us even
2288 			 * if the period we use to send data to it
2289 			 * is lower.  Only lower the response period
2290 			 * if we must.
2291 			 */
2292 			if (syncrate == &ahc_syncrates[maxsync])
2293 				*period = syncrate->period;
2294 
2295 			/*
2296 			 * At some speeds, we only support
2297 			 * ST transfers.
2298 			 */
2299 			if ((syncrate->sxfr_u2 & ST_SXFR) != 0)
2300 				*ppr_options &= ~MSG_EXT_PPR_DT_REQ;
2301 			break;
2302 		}
2303 	}
2304 
2305 	if ((*period == 0)
2306 	 || (syncrate->rate == NULL)
2307 	 || ((ahc->features & AHC_ULTRA2) != 0
2308 	  && (syncrate->sxfr_u2 == 0))) {
2309 		/* Use asynchronous transfers. */
2310 		*period = 0;
2311 		syncrate = NULL;
2312 		*ppr_options &= ~MSG_EXT_PPR_DT_REQ;
2313 	}
2314 	return (syncrate);
2315 }
2316 
2317 /*
2318  * Convert from an entry in our syncrate table to the SCSI equivalent
2319  * sync "period" factor.
2320  */
2321 u_int
2322 ahc_find_period(struct ahc_softc *ahc, u_int scsirate, u_int maxsync)
2323 {
2324 	const struct ahc_syncrate *syncrate;
2325 
2326 	if ((ahc->features & AHC_ULTRA2) != 0)
2327 		scsirate &= SXFR_ULTRA2;
2328 	else
2329 		scsirate &= SXFR;
2330 
2331 	/* now set maxsync based on card capabilities */
2332 	if ((ahc->features & AHC_DT) == 0 && maxsync < AHC_SYNCRATE_ULTRA2)
2333 		maxsync = AHC_SYNCRATE_ULTRA2;
2334 	if ((ahc->features & (AHC_DT | AHC_ULTRA2)) == 0
2335 	    && maxsync < AHC_SYNCRATE_ULTRA)
2336 		maxsync = AHC_SYNCRATE_ULTRA;
2337 	if ((ahc->features & (AHC_DT | AHC_ULTRA2 | AHC_ULTRA)) == 0
2338 	    && maxsync < AHC_SYNCRATE_FAST)
2339 		maxsync = AHC_SYNCRATE_FAST;
2340 
2341 
2342 	syncrate = &ahc_syncrates[maxsync];
2343 	while (syncrate->rate != NULL) {
2344 
2345 		if ((ahc->features & AHC_ULTRA2) != 0) {
2346 			if (syncrate->sxfr_u2 == 0)
2347 				break;
2348 			else if (scsirate == (syncrate->sxfr_u2 & SXFR_ULTRA2))
2349 				return (syncrate->period);
2350 		} else if (scsirate == (syncrate->sxfr & SXFR)) {
2351 				return (syncrate->period);
2352 		}
2353 		syncrate++;
2354 	}
2355 	return (0); /* async */
2356 }
2357 
2358 /*
2359  * Truncate the given synchronous offset to a value the
2360  * current adapter type and syncrate are capable of.
2361  */
2362 static void
2363 ahc_validate_offset(struct ahc_softc *ahc,
2364 		    struct ahc_initiator_tinfo *tinfo,
2365 		    const struct ahc_syncrate *syncrate,
2366 		    u_int *offset, int wide, role_t role)
2367 {
2368 	u_int maxoffset;
2369 
2370 	/* Limit offset to what we can do */
2371 	if (syncrate == NULL) {
2372 		maxoffset = 0;
2373 	} else if ((ahc->features & AHC_ULTRA2) != 0) {
2374 		maxoffset = MAX_OFFSET_ULTRA2;
2375 	} else {
2376 		if (wide)
2377 			maxoffset = MAX_OFFSET_16BIT;
2378 		else
2379 			maxoffset = MAX_OFFSET_8BIT;
2380 	}
2381 	*offset = min(*offset, maxoffset);
2382 	if (tinfo != NULL) {
2383 		if (role == ROLE_TARGET)
2384 			*offset = min(*offset, (u_int)tinfo->user.offset);
2385 		else
2386 			*offset = min(*offset, (u_int)tinfo->goal.offset);
2387 	}
2388 }
2389 
2390 /*
2391  * Truncate the given transfer width parameter to a value the
2392  * current adapter type is capable of.
2393  */
2394 static void
2395 ahc_validate_width(struct ahc_softc *ahc, struct ahc_initiator_tinfo *tinfo,
2396 		   u_int *bus_width, role_t role)
2397 {
2398 	switch (*bus_width) {
2399 	default:
2400 		if (ahc->features & AHC_WIDE) {
2401 			/* Respond Wide */
2402 			*bus_width = MSG_EXT_WDTR_BUS_16_BIT;
2403 			break;
2404 		}
2405 		fallthrough;
2406 	case MSG_EXT_WDTR_BUS_8_BIT:
2407 		*bus_width = MSG_EXT_WDTR_BUS_8_BIT;
2408 		break;
2409 	}
2410 	if (tinfo != NULL) {
2411 		if (role == ROLE_TARGET)
2412 			*bus_width = min((u_int)tinfo->user.width, *bus_width);
2413 		else
2414 			*bus_width = min((u_int)tinfo->goal.width, *bus_width);
2415 	}
2416 }
2417 
2418 /*
2419  * Update the bitmask of targets for which the controller should
2420  * negotiate with at the next convenient opportunity.  This currently
2421  * means the next time we send the initial identify messages for
2422  * a new transaction.
2423  */
2424 int
2425 ahc_update_neg_request(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2426 		       struct ahc_tmode_tstate *tstate,
2427 		       struct ahc_initiator_tinfo *tinfo, ahc_neg_type neg_type)
2428 {
2429 	u_int auto_negotiate_orig;
2430 
2431 	auto_negotiate_orig = tstate->auto_negotiate;
2432 	if (neg_type == AHC_NEG_ALWAYS) {
2433 		/*
2434 		 * Force our "current" settings to be
2435 		 * unknown so that unless a bus reset
2436 		 * occurs the need to renegotiate is
2437 		 * recorded persistently.
2438 		 */
2439 		if ((ahc->features & AHC_WIDE) != 0)
2440 			tinfo->curr.width = AHC_WIDTH_UNKNOWN;
2441 		tinfo->curr.period = AHC_PERIOD_UNKNOWN;
2442 		tinfo->curr.offset = AHC_OFFSET_UNKNOWN;
2443 	}
2444 	if (tinfo->curr.period != tinfo->goal.period
2445 	 || tinfo->curr.width != tinfo->goal.width
2446 	 || tinfo->curr.offset != tinfo->goal.offset
2447 	 || tinfo->curr.ppr_options != tinfo->goal.ppr_options
2448 	 || (neg_type == AHC_NEG_IF_NON_ASYNC
2449 	  && (tinfo->goal.offset != 0
2450 	   || tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT
2451 	   || tinfo->goal.ppr_options != 0)))
2452 		tstate->auto_negotiate |= devinfo->target_mask;
2453 	else
2454 		tstate->auto_negotiate &= ~devinfo->target_mask;
2455 
2456 	return (auto_negotiate_orig != tstate->auto_negotiate);
2457 }
2458 
2459 /*
2460  * Update the user/goal/curr tables of synchronous negotiation
2461  * parameters as well as, in the case of a current or active update,
2462  * any data structures on the host controller.  In the case of an
2463  * active update, the specified target is currently talking to us on
2464  * the bus, so the transfer parameter update must take effect
2465  * immediately.
2466  */
2467 void
2468 ahc_set_syncrate(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2469 		 const struct ahc_syncrate *syncrate, u_int period,
2470 		 u_int offset, u_int ppr_options, u_int type, int paused)
2471 {
2472 	struct	ahc_initiator_tinfo *tinfo;
2473 	struct	ahc_tmode_tstate *tstate;
2474 	u_int	old_period;
2475 	u_int	old_offset;
2476 	u_int	old_ppr;
2477 	int	active;
2478 	int	update_needed;
2479 
2480 	active = (type & AHC_TRANS_ACTIVE) == AHC_TRANS_ACTIVE;
2481 	update_needed = 0;
2482 
2483 	if (syncrate == NULL) {
2484 		period = 0;
2485 		offset = 0;
2486 	}
2487 
2488 	tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
2489 				    devinfo->target, &tstate);
2490 
2491 	if ((type & AHC_TRANS_USER) != 0) {
2492 		tinfo->user.period = period;
2493 		tinfo->user.offset = offset;
2494 		tinfo->user.ppr_options = ppr_options;
2495 	}
2496 
2497 	if ((type & AHC_TRANS_GOAL) != 0) {
2498 		tinfo->goal.period = period;
2499 		tinfo->goal.offset = offset;
2500 		tinfo->goal.ppr_options = ppr_options;
2501 	}
2502 
2503 	old_period = tinfo->curr.period;
2504 	old_offset = tinfo->curr.offset;
2505 	old_ppr	   = tinfo->curr.ppr_options;
2506 
2507 	if ((type & AHC_TRANS_CUR) != 0
2508 	 && (old_period != period
2509 	  || old_offset != offset
2510 	  || old_ppr != ppr_options)) {
2511 		u_int	scsirate;
2512 
2513 		update_needed++;
2514 		scsirate = tinfo->scsirate;
2515 		if ((ahc->features & AHC_ULTRA2) != 0) {
2516 
2517 			scsirate &= ~(SXFR_ULTRA2|SINGLE_EDGE|ENABLE_CRC);
2518 			if (syncrate != NULL) {
2519 				scsirate |= syncrate->sxfr_u2;
2520 				if ((ppr_options & MSG_EXT_PPR_DT_REQ) != 0)
2521 					scsirate |= ENABLE_CRC;
2522 				else
2523 					scsirate |= SINGLE_EDGE;
2524 			}
2525 		} else {
2526 
2527 			scsirate &= ~(SXFR|SOFS);
2528 			/*
2529 			 * Ensure Ultra mode is set properly for
2530 			 * this target.
2531 			 */
2532 			tstate->ultraenb &= ~devinfo->target_mask;
2533 			if (syncrate != NULL) {
2534 				if (syncrate->sxfr & ULTRA_SXFR) {
2535 					tstate->ultraenb |=
2536 						devinfo->target_mask;
2537 				}
2538 				scsirate |= syncrate->sxfr & SXFR;
2539 				scsirate |= offset & SOFS;
2540 			}
2541 			if (active) {
2542 				u_int sxfrctl0;
2543 
2544 				sxfrctl0 = ahc_inb(ahc, SXFRCTL0);
2545 				sxfrctl0 &= ~FAST20;
2546 				if (tstate->ultraenb & devinfo->target_mask)
2547 					sxfrctl0 |= FAST20;
2548 				ahc_outb(ahc, SXFRCTL0, sxfrctl0);
2549 			}
2550 		}
2551 		if (active) {
2552 			ahc_outb(ahc, SCSIRATE, scsirate);
2553 			if ((ahc->features & AHC_ULTRA2) != 0)
2554 				ahc_outb(ahc, SCSIOFFSET, offset);
2555 		}
2556 
2557 		tinfo->scsirate = scsirate;
2558 		tinfo->curr.period = period;
2559 		tinfo->curr.offset = offset;
2560 		tinfo->curr.ppr_options = ppr_options;
2561 
2562 		ahc_send_async(ahc, devinfo->channel, devinfo->target,
2563 			       CAM_LUN_WILDCARD, AC_TRANSFER_NEG);
2564 		if (bootverbose) {
2565 			if (offset != 0) {
2566 				printk("%s: target %d synchronous at %sMHz%s, "
2567 				       "offset = 0x%x\n", ahc_name(ahc),
2568 				       devinfo->target, syncrate->rate,
2569 				       (ppr_options & MSG_EXT_PPR_DT_REQ)
2570 				       ? " DT" : "", offset);
2571 			} else {
2572 				printk("%s: target %d using "
2573 				       "asynchronous transfers\n",
2574 				       ahc_name(ahc), devinfo->target);
2575 			}
2576 		}
2577 	}
2578 
2579 	update_needed += ahc_update_neg_request(ahc, devinfo, tstate,
2580 						tinfo, AHC_NEG_TO_GOAL);
2581 
2582 	if (update_needed)
2583 		ahc_update_pending_scbs(ahc);
2584 }
2585 
2586 /*
2587  * Update the user/goal/curr tables of wide negotiation
2588  * parameters as well as, in the case of a current or active update,
2589  * any data structures on the host controller.  In the case of an
2590  * active update, the specified target is currently talking to us on
2591  * the bus, so the transfer parameter update must take effect
2592  * immediately.
2593  */
2594 void
2595 ahc_set_width(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2596 	      u_int width, u_int type, int paused)
2597 {
2598 	struct	ahc_initiator_tinfo *tinfo;
2599 	struct	ahc_tmode_tstate *tstate;
2600 	u_int	oldwidth;
2601 	int	active;
2602 	int	update_needed;
2603 
2604 	active = (type & AHC_TRANS_ACTIVE) == AHC_TRANS_ACTIVE;
2605 	update_needed = 0;
2606 	tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
2607 				    devinfo->target, &tstate);
2608 
2609 	if ((type & AHC_TRANS_USER) != 0)
2610 		tinfo->user.width = width;
2611 
2612 	if ((type & AHC_TRANS_GOAL) != 0)
2613 		tinfo->goal.width = width;
2614 
2615 	oldwidth = tinfo->curr.width;
2616 	if ((type & AHC_TRANS_CUR) != 0 && oldwidth != width) {
2617 		u_int	scsirate;
2618 
2619 		update_needed++;
2620 		scsirate =  tinfo->scsirate;
2621 		scsirate &= ~WIDEXFER;
2622 		if (width == MSG_EXT_WDTR_BUS_16_BIT)
2623 			scsirate |= WIDEXFER;
2624 
2625 		tinfo->scsirate = scsirate;
2626 
2627 		if (active)
2628 			ahc_outb(ahc, SCSIRATE, scsirate);
2629 
2630 		tinfo->curr.width = width;
2631 
2632 		ahc_send_async(ahc, devinfo->channel, devinfo->target,
2633 			       CAM_LUN_WILDCARD, AC_TRANSFER_NEG);
2634 		if (bootverbose) {
2635 			printk("%s: target %d using %dbit transfers\n",
2636 			       ahc_name(ahc), devinfo->target,
2637 			       8 * (0x01 << width));
2638 		}
2639 	}
2640 
2641 	update_needed += ahc_update_neg_request(ahc, devinfo, tstate,
2642 						tinfo, AHC_NEG_TO_GOAL);
2643 	if (update_needed)
2644 		ahc_update_pending_scbs(ahc);
2645 }
2646 
2647 /*
2648  * Update the current state of tagged queuing for a given target.
2649  */
2650 static void
2651 ahc_set_tags(struct ahc_softc *ahc, struct scsi_cmnd *cmd,
2652 	     struct ahc_devinfo *devinfo, ahc_queue_alg alg)
2653 {
2654 	struct scsi_device *sdev = cmd->device;
2655 
2656 	ahc_platform_set_tags(ahc, sdev, devinfo, alg);
2657 	ahc_send_async(ahc, devinfo->channel, devinfo->target,
2658 		       devinfo->lun, AC_TRANSFER_NEG);
2659 }
2660 
2661 /*
2662  * When the transfer settings for a connection change, update any
2663  * in-transit SCBs to contain the new data so the hardware will
2664  * be set correctly during future (re)selections.
2665  */
2666 static void
2667 ahc_update_pending_scbs(struct ahc_softc *ahc)
2668 {
2669 	struct	scb *pending_scb;
2670 	int	pending_scb_count;
2671 	int	i;
2672 	int	paused;
2673 	u_int	saved_scbptr;
2674 
2675 	/*
2676 	 * Traverse the pending SCB list and ensure that all of the
2677 	 * SCBs there have the proper settings.
2678 	 */
2679 	pending_scb_count = 0;
2680 	LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2681 		struct ahc_devinfo devinfo;
2682 		struct hardware_scb *pending_hscb;
2683 		struct ahc_initiator_tinfo *tinfo;
2684 		struct ahc_tmode_tstate *tstate;
2685 
2686 		ahc_scb_devinfo(ahc, &devinfo, pending_scb);
2687 		tinfo = ahc_fetch_transinfo(ahc, devinfo.channel,
2688 					    devinfo.our_scsiid,
2689 					    devinfo.target, &tstate);
2690 		pending_hscb = pending_scb->hscb;
2691 		pending_hscb->control &= ~ULTRAENB;
2692 		if ((tstate->ultraenb & devinfo.target_mask) != 0)
2693 			pending_hscb->control |= ULTRAENB;
2694 		pending_hscb->scsirate = tinfo->scsirate;
2695 		pending_hscb->scsioffset = tinfo->curr.offset;
2696 		if ((tstate->auto_negotiate & devinfo.target_mask) == 0
2697 		 && (pending_scb->flags & SCB_AUTO_NEGOTIATE) != 0) {
2698 			pending_scb->flags &= ~SCB_AUTO_NEGOTIATE;
2699 			pending_hscb->control &= ~MK_MESSAGE;
2700 		}
2701 		ahc_sync_scb(ahc, pending_scb,
2702 			     BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
2703 		pending_scb_count++;
2704 	}
2705 
2706 	if (pending_scb_count == 0)
2707 		return;
2708 
2709 	if (ahc_is_paused(ahc)) {
2710 		paused = 1;
2711 	} else {
2712 		paused = 0;
2713 		ahc_pause(ahc);
2714 	}
2715 
2716 	saved_scbptr = ahc_inb(ahc, SCBPTR);
2717 	/* Ensure that the hscbs down on the card match the new information */
2718 	for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
2719 		struct	hardware_scb *pending_hscb;
2720 		u_int	control;
2721 		u_int	scb_tag;
2722 
2723 		ahc_outb(ahc, SCBPTR, i);
2724 		scb_tag = ahc_inb(ahc, SCB_TAG);
2725 		pending_scb = ahc_lookup_scb(ahc, scb_tag);
2726 		if (pending_scb == NULL)
2727 			continue;
2728 
2729 		pending_hscb = pending_scb->hscb;
2730 		control = ahc_inb(ahc, SCB_CONTROL);
2731 		control &= ~(ULTRAENB|MK_MESSAGE);
2732 		control |= pending_hscb->control & (ULTRAENB|MK_MESSAGE);
2733 		ahc_outb(ahc, SCB_CONTROL, control);
2734 		ahc_outb(ahc, SCB_SCSIRATE, pending_hscb->scsirate);
2735 		ahc_outb(ahc, SCB_SCSIOFFSET, pending_hscb->scsioffset);
2736 	}
2737 	ahc_outb(ahc, SCBPTR, saved_scbptr);
2738 
2739 	if (paused == 0)
2740 		ahc_unpause(ahc);
2741 }
2742 
2743 /**************************** Pathing Information *****************************/
2744 static void
2745 ahc_fetch_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
2746 {
2747 	u_int	saved_scsiid;
2748 	role_t	role;
2749 	int	our_id;
2750 
2751 	if (ahc_inb(ahc, SSTAT0) & TARGET)
2752 		role = ROLE_TARGET;
2753 	else
2754 		role = ROLE_INITIATOR;
2755 
2756 	if (role == ROLE_TARGET
2757 	    && (ahc->features & AHC_MULTI_TID) != 0
2758 	    && (ahc_inb(ahc, SEQ_FLAGS)
2759 	     & (CMDPHASE_PENDING|TARG_CMD_PENDING|NO_DISCONNECT)) != 0) {
2760 		/* We were selected, so pull our id from TARGIDIN */
2761 		our_id = ahc_inb(ahc, TARGIDIN) & OID;
2762 	} else if ((ahc->features & AHC_ULTRA2) != 0)
2763 		our_id = ahc_inb(ahc, SCSIID_ULTRA2) & OID;
2764 	else
2765 		our_id = ahc_inb(ahc, SCSIID) & OID;
2766 
2767 	saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2768 	ahc_compile_devinfo(devinfo,
2769 			    our_id,
2770 			    SCSIID_TARGET(ahc, saved_scsiid),
2771 			    ahc_inb(ahc, SAVED_LUN),
2772 			    SCSIID_CHANNEL(ahc, saved_scsiid),
2773 			    role);
2774 }
2775 
2776 static const struct ahc_phase_table_entry*
2777 ahc_lookup_phase_entry(int phase)
2778 {
2779 	const struct ahc_phase_table_entry *entry;
2780 	const struct ahc_phase_table_entry *last_entry;
2781 
2782 	/*
2783 	 * num_phases doesn't include the default entry which
2784 	 * will be returned if the phase doesn't match.
2785 	 */
2786 	last_entry = &ahc_phase_table[num_phases];
2787 	for (entry = ahc_phase_table; entry < last_entry; entry++) {
2788 		if (phase == entry->phase)
2789 			break;
2790 	}
2791 	return (entry);
2792 }
2793 
2794 void
2795 ahc_compile_devinfo(struct ahc_devinfo *devinfo, u_int our_id, u_int target,
2796 		    u_int lun, char channel, role_t role)
2797 {
2798 	devinfo->our_scsiid = our_id;
2799 	devinfo->target = target;
2800 	devinfo->lun = lun;
2801 	devinfo->target_offset = target;
2802 	devinfo->channel = channel;
2803 	devinfo->role = role;
2804 	if (channel == 'B')
2805 		devinfo->target_offset += 8;
2806 	devinfo->target_mask = (0x01 << devinfo->target_offset);
2807 }
2808 
2809 void
2810 ahc_print_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
2811 {
2812 	printk("%s:%c:%d:%d: ", ahc_name(ahc), devinfo->channel,
2813 	       devinfo->target, devinfo->lun);
2814 }
2815 
2816 static void
2817 ahc_scb_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2818 		struct scb *scb)
2819 {
2820 	role_t	role;
2821 	int	our_id;
2822 
2823 	our_id = SCSIID_OUR_ID(scb->hscb->scsiid);
2824 	role = ROLE_INITIATOR;
2825 	if ((scb->flags & SCB_TARGET_SCB) != 0)
2826 		role = ROLE_TARGET;
2827 	ahc_compile_devinfo(devinfo, our_id, SCB_GET_TARGET(ahc, scb),
2828 			    SCB_GET_LUN(scb), SCB_GET_CHANNEL(ahc, scb), role);
2829 }
2830 
2831 
2832 /************************ Message Phase Processing ****************************/
2833 static void
2834 ahc_assert_atn(struct ahc_softc *ahc)
2835 {
2836 	u_int scsisigo;
2837 
2838 	scsisigo = ATNO;
2839 	if ((ahc->features & AHC_DT) == 0)
2840 		scsisigo |= ahc_inb(ahc, SCSISIGI);
2841 	ahc_outb(ahc, SCSISIGO, scsisigo);
2842 }
2843 
2844 /*
2845  * When an initiator transaction with the MK_MESSAGE flag either reconnects
2846  * or enters the initial message out phase, we are interrupted.  Fill our
2847  * outgoing message buffer with the appropriate message and beging handing
2848  * the message phase(s) manually.
2849  */
2850 static void
2851 ahc_setup_initiator_msgout(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2852 			   struct scb *scb)
2853 {
2854 	/*
2855 	 * To facilitate adding multiple messages together,
2856 	 * each routine should increment the index and len
2857 	 * variables instead of setting them explicitly.
2858 	 */
2859 	ahc->msgout_index = 0;
2860 	ahc->msgout_len = 0;
2861 
2862 	if ((scb->flags & SCB_DEVICE_RESET) == 0
2863 	 && ahc_inb(ahc, MSG_OUT) == MSG_IDENTIFYFLAG) {
2864 		u_int identify_msg;
2865 
2866 		identify_msg = MSG_IDENTIFYFLAG | SCB_GET_LUN(scb);
2867 		if ((scb->hscb->control & DISCENB) != 0)
2868 			identify_msg |= MSG_IDENTIFY_DISCFLAG;
2869 		ahc->msgout_buf[ahc->msgout_index++] = identify_msg;
2870 		ahc->msgout_len++;
2871 
2872 		if ((scb->hscb->control & TAG_ENB) != 0) {
2873 			ahc->msgout_buf[ahc->msgout_index++] =
2874 			    scb->hscb->control & (TAG_ENB|SCB_TAG_TYPE);
2875 			ahc->msgout_buf[ahc->msgout_index++] = scb->hscb->tag;
2876 			ahc->msgout_len += 2;
2877 		}
2878 	}
2879 
2880 	if (scb->flags & SCB_DEVICE_RESET) {
2881 		ahc->msgout_buf[ahc->msgout_index++] = TARGET_RESET;
2882 		ahc->msgout_len++;
2883 		ahc_print_path(ahc, scb);
2884 		printk("Bus Device Reset Message Sent\n");
2885 		/*
2886 		 * Clear our selection hardware in advance of
2887 		 * the busfree.  We may have an entry in the waiting
2888 		 * Q for this target, and we don't want to go about
2889 		 * selecting while we handle the busfree and blow it
2890 		 * away.
2891 		 */
2892 		ahc_outb(ahc, SCSISEQ, (ahc_inb(ahc, SCSISEQ) & ~ENSELO));
2893 	} else if ((scb->flags & SCB_ABORT) != 0) {
2894 		if ((scb->hscb->control & TAG_ENB) != 0)
2895 			ahc->msgout_buf[ahc->msgout_index++] = ABORT_TASK;
2896 		else
2897 			ahc->msgout_buf[ahc->msgout_index++] = ABORT_TASK_SET;
2898 		ahc->msgout_len++;
2899 		ahc_print_path(ahc, scb);
2900 		printk("Abort%s Message Sent\n",
2901 		       (scb->hscb->control & TAG_ENB) != 0 ? " Tag" : "");
2902 		/*
2903 		 * Clear our selection hardware in advance of
2904 		 * the busfree.  We may have an entry in the waiting
2905 		 * Q for this target, and we don't want to go about
2906 		 * selecting while we handle the busfree and blow it
2907 		 * away.
2908 		 */
2909 		ahc_outb(ahc, SCSISEQ, (ahc_inb(ahc, SCSISEQ) & ~ENSELO));
2910 	} else if ((scb->flags & (SCB_AUTO_NEGOTIATE|SCB_NEGOTIATE)) != 0) {
2911 		ahc_build_transfer_msg(ahc, devinfo);
2912 	} else {
2913 		printk("ahc_intr: AWAITING_MSG for an SCB that "
2914 		       "does not have a waiting message\n");
2915 		printk("SCSIID = %x, target_mask = %x\n", scb->hscb->scsiid,
2916 		       devinfo->target_mask);
2917 		panic("SCB = %d, SCB Control = %x, MSG_OUT = %x "
2918 		      "SCB flags = %x", scb->hscb->tag, scb->hscb->control,
2919 		      ahc_inb(ahc, MSG_OUT), scb->flags);
2920 	}
2921 
2922 	/*
2923 	 * Clear the MK_MESSAGE flag from the SCB so we aren't
2924 	 * asked to send this message again.
2925 	 */
2926 	ahc_outb(ahc, SCB_CONTROL, ahc_inb(ahc, SCB_CONTROL) & ~MK_MESSAGE);
2927 	scb->hscb->control &= ~MK_MESSAGE;
2928 	ahc->msgout_index = 0;
2929 	ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
2930 }
2931 
2932 /*
2933  * Build an appropriate transfer negotiation message for the
2934  * currently active target.
2935  */
2936 static void
2937 ahc_build_transfer_msg(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
2938 {
2939 	/*
2940 	 * We need to initiate transfer negotiations.
2941 	 * If our current and goal settings are identical,
2942 	 * we want to renegotiate due to a check condition.
2943 	 */
2944 	struct	ahc_initiator_tinfo *tinfo;
2945 	struct	ahc_tmode_tstate *tstate;
2946 	const struct ahc_syncrate *rate;
2947 	int	dowide;
2948 	int	dosync;
2949 	int	doppr;
2950 	u_int	period;
2951 	u_int	ppr_options;
2952 	u_int	offset;
2953 
2954 	tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
2955 				    devinfo->target, &tstate);
2956 	/*
2957 	 * Filter our period based on the current connection.
2958 	 * If we can't perform DT transfers on this segment (not in LVD
2959 	 * mode for instance), then our decision to issue a PPR message
2960 	 * may change.
2961 	 */
2962 	period = tinfo->goal.period;
2963 	offset = tinfo->goal.offset;
2964 	ppr_options = tinfo->goal.ppr_options;
2965 	/* Target initiated PPR is not allowed in the SCSI spec */
2966 	if (devinfo->role == ROLE_TARGET)
2967 		ppr_options = 0;
2968 	rate = ahc_devlimited_syncrate(ahc, tinfo, &period,
2969 				       &ppr_options, devinfo->role);
2970 	dowide = tinfo->curr.width != tinfo->goal.width;
2971 	dosync = tinfo->curr.offset != offset || tinfo->curr.period != period;
2972 	/*
2973 	 * Only use PPR if we have options that need it, even if the device
2974 	 * claims to support it.  There might be an expander in the way
2975 	 * that doesn't.
2976 	 */
2977 	doppr = ppr_options != 0;
2978 
2979 	if (!dowide && !dosync && !doppr) {
2980 		dowide = tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT;
2981 		dosync = tinfo->goal.offset != 0;
2982 	}
2983 
2984 	if (!dowide && !dosync && !doppr) {
2985 		/*
2986 		 * Force async with a WDTR message if we have a wide bus,
2987 		 * or just issue an SDTR with a 0 offset.
2988 		 */
2989 		if ((ahc->features & AHC_WIDE) != 0)
2990 			dowide = 1;
2991 		else
2992 			dosync = 1;
2993 
2994 		if (bootverbose) {
2995 			ahc_print_devinfo(ahc, devinfo);
2996 			printk("Ensuring async\n");
2997 		}
2998 	}
2999 
3000 	/* Target initiated PPR is not allowed in the SCSI spec */
3001 	if (devinfo->role == ROLE_TARGET)
3002 		doppr = 0;
3003 
3004 	/*
3005 	 * Both the PPR message and SDTR message require the
3006 	 * goal syncrate to be limited to what the target device
3007 	 * is capable of handling (based on whether an LVD->SE
3008 	 * expander is on the bus), so combine these two cases.
3009 	 * Regardless, guarantee that if we are using WDTR and SDTR
3010 	 * messages that WDTR comes first.
3011 	 */
3012 	if (doppr || (dosync && !dowide)) {
3013 
3014 		offset = tinfo->goal.offset;
3015 		ahc_validate_offset(ahc, tinfo, rate, &offset,
3016 				    doppr ? tinfo->goal.width
3017 					  : tinfo->curr.width,
3018 				    devinfo->role);
3019 		if (doppr) {
3020 			ahc_construct_ppr(ahc, devinfo, period, offset,
3021 					  tinfo->goal.width, ppr_options);
3022 		} else {
3023 			ahc_construct_sdtr(ahc, devinfo, period, offset);
3024 		}
3025 	} else {
3026 		ahc_construct_wdtr(ahc, devinfo, tinfo->goal.width);
3027 	}
3028 }
3029 
3030 /*
3031  * Build a synchronous negotiation message in our message
3032  * buffer based on the input parameters.
3033  */
3034 static void
3035 ahc_construct_sdtr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
3036 		   u_int period, u_int offset)
3037 {
3038 	if (offset == 0)
3039 		period = AHC_ASYNC_XFER_PERIOD;
3040 	ahc->msgout_index += spi_populate_sync_msg(
3041 			ahc->msgout_buf + ahc->msgout_index, period, offset);
3042 	ahc->msgout_len += 5;
3043 	if (bootverbose) {
3044 		printk("(%s:%c:%d:%d): Sending SDTR period %x, offset %x\n",
3045 		       ahc_name(ahc), devinfo->channel, devinfo->target,
3046 		       devinfo->lun, period, offset);
3047 	}
3048 }
3049 
3050 /*
3051  * Build a wide negotiation message in our message
3052  * buffer based on the input parameters.
3053  */
3054 static void
3055 ahc_construct_wdtr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
3056 		   u_int bus_width)
3057 {
3058 	ahc->msgout_index += spi_populate_width_msg(
3059 			ahc->msgout_buf + ahc->msgout_index, bus_width);
3060 	ahc->msgout_len += 4;
3061 	if (bootverbose) {
3062 		printk("(%s:%c:%d:%d): Sending WDTR %x\n",
3063 		       ahc_name(ahc), devinfo->channel, devinfo->target,
3064 		       devinfo->lun, bus_width);
3065 	}
3066 }
3067 
3068 /*
3069  * Build a parallel protocol request message in our message
3070  * buffer based on the input parameters.
3071  */
3072 static void
3073 ahc_construct_ppr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
3074 		  u_int period, u_int offset, u_int bus_width,
3075 		  u_int ppr_options)
3076 {
3077 	if (offset == 0)
3078 		period = AHC_ASYNC_XFER_PERIOD;
3079 	ahc->msgout_index += spi_populate_ppr_msg(
3080 			ahc->msgout_buf + ahc->msgout_index, period, offset,
3081 			bus_width, ppr_options);
3082 	ahc->msgout_len += 8;
3083 	if (bootverbose) {
3084 		printk("(%s:%c:%d:%d): Sending PPR bus_width %x, period %x, "
3085 		       "offset %x, ppr_options %x\n", ahc_name(ahc),
3086 		       devinfo->channel, devinfo->target, devinfo->lun,
3087 		       bus_width, period, offset, ppr_options);
3088 	}
3089 }
3090 
3091 /*
3092  * Clear any active message state.
3093  */
3094 static void
3095 ahc_clear_msg_state(struct ahc_softc *ahc)
3096 {
3097 	ahc->msgout_len = 0;
3098 	ahc->msgin_index = 0;
3099 	ahc->msg_type = MSG_TYPE_NONE;
3100 	if ((ahc_inb(ahc, SCSISIGI) & ATNI) != 0) {
3101 		/*
3102 		 * The target didn't care to respond to our
3103 		 * message request, so clear ATN.
3104 		 */
3105 		ahc_outb(ahc, CLRSINT1, CLRATNO);
3106 	}
3107 	ahc_outb(ahc, MSG_OUT, NOP);
3108 	ahc_outb(ahc, SEQ_FLAGS2,
3109 		 ahc_inb(ahc, SEQ_FLAGS2) & ~TARGET_MSG_PENDING);
3110 }
3111 
3112 static void
3113 ahc_handle_proto_violation(struct ahc_softc *ahc)
3114 {
3115 	struct	ahc_devinfo devinfo;
3116 	struct	scb *scb;
3117 	u_int	scbid;
3118 	u_int	seq_flags;
3119 	u_int	curphase;
3120 	u_int	lastphase;
3121 	int	found;
3122 
3123 	ahc_fetch_devinfo(ahc, &devinfo);
3124 	scbid = ahc_inb(ahc, SCB_TAG);
3125 	scb = ahc_lookup_scb(ahc, scbid);
3126 	seq_flags = ahc_inb(ahc, SEQ_FLAGS);
3127 	curphase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
3128 	lastphase = ahc_inb(ahc, LASTPHASE);
3129 	if ((seq_flags & NOT_IDENTIFIED) != 0) {
3130 
3131 		/*
3132 		 * The reconnecting target either did not send an
3133 		 * identify message, or did, but we didn't find an SCB
3134 		 * to match.
3135 		 */
3136 		ahc_print_devinfo(ahc, &devinfo);
3137 		printk("Target did not send an IDENTIFY message. "
3138 		       "LASTPHASE = 0x%x.\n", lastphase);
3139 		scb = NULL;
3140 	} else if (scb == NULL) {
3141 		/*
3142 		 * We don't seem to have an SCB active for this
3143 		 * transaction.  Print an error and reset the bus.
3144 		 */
3145 		ahc_print_devinfo(ahc, &devinfo);
3146 		printk("No SCB found during protocol violation\n");
3147 		goto proto_violation_reset;
3148 	} else {
3149 		ahc_set_transaction_status(scb, CAM_SEQUENCE_FAIL);
3150 		if ((seq_flags & NO_CDB_SENT) != 0) {
3151 			ahc_print_path(ahc, scb);
3152 			printk("No or incomplete CDB sent to device.\n");
3153 		} else if ((ahc_inb(ahc, SCB_CONTROL) & STATUS_RCVD) == 0) {
3154 			/*
3155 			 * The target never bothered to provide status to
3156 			 * us prior to completing the command.  Since we don't
3157 			 * know the disposition of this command, we must attempt
3158 			 * to abort it.  Assert ATN and prepare to send an abort
3159 			 * message.
3160 			 */
3161 			ahc_print_path(ahc, scb);
3162 			printk("Completed command without status.\n");
3163 		} else {
3164 			ahc_print_path(ahc, scb);
3165 			printk("Unknown protocol violation.\n");
3166 			ahc_dump_card_state(ahc);
3167 		}
3168 	}
3169 	if ((lastphase & ~P_DATAIN_DT) == 0
3170 	 || lastphase == P_COMMAND) {
3171 proto_violation_reset:
3172 		/*
3173 		 * Target either went directly to data/command
3174 		 * phase or didn't respond to our ATN.
3175 		 * The only safe thing to do is to blow
3176 		 * it away with a bus reset.
3177 		 */
3178 		found = ahc_reset_channel(ahc, 'A', TRUE);
3179 		printk("%s: Issued Channel %c Bus Reset. "
3180 		       "%d SCBs aborted\n", ahc_name(ahc), 'A', found);
3181 	} else {
3182 		/*
3183 		 * Leave the selection hardware off in case
3184 		 * this abort attempt will affect yet to
3185 		 * be sent commands.
3186 		 */
3187 		ahc_outb(ahc, SCSISEQ,
3188 			 ahc_inb(ahc, SCSISEQ) & ~ENSELO);
3189 		ahc_assert_atn(ahc);
3190 		ahc_outb(ahc, MSG_OUT, HOST_MSG);
3191 		if (scb == NULL) {
3192 			ahc_print_devinfo(ahc, &devinfo);
3193 			ahc->msgout_buf[0] = ABORT_TASK;
3194 			ahc->msgout_len = 1;
3195 			ahc->msgout_index = 0;
3196 			ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
3197 		} else {
3198 			ahc_print_path(ahc, scb);
3199 			scb->flags |= SCB_ABORT;
3200 		}
3201 		printk("Protocol violation %s.  Attempting to abort.\n",
3202 		       ahc_lookup_phase_entry(curphase)->phasemsg);
3203 	}
3204 }
3205 
3206 /*
3207  * Manual message loop handler.
3208  */
3209 static void
3210 ahc_handle_message_phase(struct ahc_softc *ahc)
3211 {
3212 	struct	ahc_devinfo devinfo;
3213 	u_int	bus_phase;
3214 	int	end_session;
3215 
3216 	ahc_fetch_devinfo(ahc, &devinfo);
3217 	end_session = FALSE;
3218 	bus_phase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
3219 
3220 reswitch:
3221 	switch (ahc->msg_type) {
3222 	case MSG_TYPE_INITIATOR_MSGOUT:
3223 	{
3224 		int lastbyte;
3225 		int phasemis;
3226 		int msgdone;
3227 
3228 		if (ahc->msgout_len == 0)
3229 			panic("HOST_MSG_LOOP interrupt with no active message");
3230 
3231 #ifdef AHC_DEBUG
3232 		if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
3233 			ahc_print_devinfo(ahc, &devinfo);
3234 			printk("INITIATOR_MSG_OUT");
3235 		}
3236 #endif
3237 		phasemis = bus_phase != P_MESGOUT;
3238 		if (phasemis) {
3239 #ifdef AHC_DEBUG
3240 			if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
3241 				printk(" PHASEMIS %s\n",
3242 				       ahc_lookup_phase_entry(bus_phase)
3243 							     ->phasemsg);
3244 			}
3245 #endif
3246 			if (bus_phase == P_MESGIN) {
3247 				/*
3248 				 * Change gears and see if
3249 				 * this messages is of interest to
3250 				 * us or should be passed back to
3251 				 * the sequencer.
3252 				 */
3253 				ahc_outb(ahc, CLRSINT1, CLRATNO);
3254 				ahc->send_msg_perror = FALSE;
3255 				ahc->msg_type = MSG_TYPE_INITIATOR_MSGIN;
3256 				ahc->msgin_index = 0;
3257 				goto reswitch;
3258 			}
3259 			end_session = TRUE;
3260 			break;
3261 		}
3262 
3263 		if (ahc->send_msg_perror) {
3264 			ahc_outb(ahc, CLRSINT1, CLRATNO);
3265 			ahc_outb(ahc, CLRSINT1, CLRREQINIT);
3266 #ifdef AHC_DEBUG
3267 			if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
3268 				printk(" byte 0x%x\n", ahc->send_msg_perror);
3269 #endif
3270 			ahc_outb(ahc, SCSIDATL, MSG_PARITY_ERROR);
3271 			break;
3272 		}
3273 
3274 		msgdone	= ahc->msgout_index == ahc->msgout_len;
3275 		if (msgdone) {
3276 			/*
3277 			 * The target has requested a retry.
3278 			 * Re-assert ATN, reset our message index to
3279 			 * 0, and try again.
3280 			 */
3281 			ahc->msgout_index = 0;
3282 			ahc_assert_atn(ahc);
3283 		}
3284 
3285 		lastbyte = ahc->msgout_index == (ahc->msgout_len - 1);
3286 		if (lastbyte) {
3287 			/* Last byte is signified by dropping ATN */
3288 			ahc_outb(ahc, CLRSINT1, CLRATNO);
3289 		}
3290 
3291 		/*
3292 		 * Clear our interrupt status and present
3293 		 * the next byte on the bus.
3294 		 */
3295 		ahc_outb(ahc, CLRSINT1, CLRREQINIT);
3296 #ifdef AHC_DEBUG
3297 		if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
3298 			printk(" byte 0x%x\n",
3299 			       ahc->msgout_buf[ahc->msgout_index]);
3300 #endif
3301 		ahc_outb(ahc, SCSIDATL, ahc->msgout_buf[ahc->msgout_index++]);
3302 		break;
3303 	}
3304 	case MSG_TYPE_INITIATOR_MSGIN:
3305 	{
3306 		int phasemis;
3307 		int message_done;
3308 
3309 #ifdef AHC_DEBUG
3310 		if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
3311 			ahc_print_devinfo(ahc, &devinfo);
3312 			printk("INITIATOR_MSG_IN");
3313 		}
3314 #endif
3315 		phasemis = bus_phase != P_MESGIN;
3316 		if (phasemis) {
3317 #ifdef AHC_DEBUG
3318 			if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
3319 				printk(" PHASEMIS %s\n",
3320 				       ahc_lookup_phase_entry(bus_phase)
3321 							     ->phasemsg);
3322 			}
3323 #endif
3324 			ahc->msgin_index = 0;
3325 			if (bus_phase == P_MESGOUT
3326 			 && (ahc->send_msg_perror == TRUE
3327 			  || (ahc->msgout_len != 0
3328 			   && ahc->msgout_index == 0))) {
3329 				ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
3330 				goto reswitch;
3331 			}
3332 			end_session = TRUE;
3333 			break;
3334 		}
3335 
3336 		/* Pull the byte in without acking it */
3337 		ahc->msgin_buf[ahc->msgin_index] = ahc_inb(ahc, SCSIBUSL);
3338 #ifdef AHC_DEBUG
3339 		if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
3340 			printk(" byte 0x%x\n",
3341 			       ahc->msgin_buf[ahc->msgin_index]);
3342 #endif
3343 
3344 		message_done = ahc_parse_msg(ahc, &devinfo);
3345 
3346 		if (message_done) {
3347 			/*
3348 			 * Clear our incoming message buffer in case there
3349 			 * is another message following this one.
3350 			 */
3351 			ahc->msgin_index = 0;
3352 
3353 			/*
3354 			 * If this message illicited a response,
3355 			 * assert ATN so the target takes us to the
3356 			 * message out phase.
3357 			 */
3358 			if (ahc->msgout_len != 0) {
3359 #ifdef AHC_DEBUG
3360 				if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
3361 					ahc_print_devinfo(ahc, &devinfo);
3362 					printk("Asserting ATN for response\n");
3363 				}
3364 #endif
3365 				ahc_assert_atn(ahc);
3366 			}
3367 		} else
3368 			ahc->msgin_index++;
3369 
3370 		if (message_done == MSGLOOP_TERMINATED) {
3371 			end_session = TRUE;
3372 		} else {
3373 			/* Ack the byte */
3374 			ahc_outb(ahc, CLRSINT1, CLRREQINIT);
3375 			ahc_inb(ahc, SCSIDATL);
3376 		}
3377 		break;
3378 	}
3379 	case MSG_TYPE_TARGET_MSGIN:
3380 	{
3381 		int msgdone;
3382 		int msgout_request;
3383 
3384 		if (ahc->msgout_len == 0)
3385 			panic("Target MSGIN with no active message");
3386 
3387 		/*
3388 		 * If we interrupted a mesgout session, the initiator
3389 		 * will not know this until our first REQ.  So, we
3390 		 * only honor mesgout requests after we've sent our
3391 		 * first byte.
3392 		 */
3393 		if ((ahc_inb(ahc, SCSISIGI) & ATNI) != 0
3394 		 && ahc->msgout_index > 0)
3395 			msgout_request = TRUE;
3396 		else
3397 			msgout_request = FALSE;
3398 
3399 		if (msgout_request) {
3400 
3401 			/*
3402 			 * Change gears and see if
3403 			 * this messages is of interest to
3404 			 * us or should be passed back to
3405 			 * the sequencer.
3406 			 */
3407 			ahc->msg_type = MSG_TYPE_TARGET_MSGOUT;
3408 			ahc_outb(ahc, SCSISIGO, P_MESGOUT | BSYO);
3409 			ahc->msgin_index = 0;
3410 			/* Dummy read to REQ for first byte */
3411 			ahc_inb(ahc, SCSIDATL);
3412 			ahc_outb(ahc, SXFRCTL0,
3413 				 ahc_inb(ahc, SXFRCTL0) | SPIOEN);
3414 			break;
3415 		}
3416 
3417 		msgdone = ahc->msgout_index == ahc->msgout_len;
3418 		if (msgdone) {
3419 			ahc_outb(ahc, SXFRCTL0,
3420 				 ahc_inb(ahc, SXFRCTL0) & ~SPIOEN);
3421 			end_session = TRUE;
3422 			break;
3423 		}
3424 
3425 		/*
3426 		 * Present the next byte on the bus.
3427 		 */
3428 		ahc_outb(ahc, SXFRCTL0, ahc_inb(ahc, SXFRCTL0) | SPIOEN);
3429 		ahc_outb(ahc, SCSIDATL, ahc->msgout_buf[ahc->msgout_index++]);
3430 		break;
3431 	}
3432 	case MSG_TYPE_TARGET_MSGOUT:
3433 	{
3434 		int lastbyte;
3435 		int msgdone;
3436 
3437 		/*
3438 		 * The initiator signals that this is
3439 		 * the last byte by dropping ATN.
3440 		 */
3441 		lastbyte = (ahc_inb(ahc, SCSISIGI) & ATNI) == 0;
3442 
3443 		/*
3444 		 * Read the latched byte, but turn off SPIOEN first
3445 		 * so that we don't inadvertently cause a REQ for the
3446 		 * next byte.
3447 		 */
3448 		ahc_outb(ahc, SXFRCTL0, ahc_inb(ahc, SXFRCTL0) & ~SPIOEN);
3449 		ahc->msgin_buf[ahc->msgin_index] = ahc_inb(ahc, SCSIDATL);
3450 		msgdone = ahc_parse_msg(ahc, &devinfo);
3451 		if (msgdone == MSGLOOP_TERMINATED) {
3452 			/*
3453 			 * The message is *really* done in that it caused
3454 			 * us to go to bus free.  The sequencer has already
3455 			 * been reset at this point, so pull the ejection
3456 			 * handle.
3457 			 */
3458 			return;
3459 		}
3460 
3461 		ahc->msgin_index++;
3462 
3463 		/*
3464 		 * XXX Read spec about initiator dropping ATN too soon
3465 		 *     and use msgdone to detect it.
3466 		 */
3467 		if (msgdone == MSGLOOP_MSGCOMPLETE) {
3468 			ahc->msgin_index = 0;
3469 
3470 			/*
3471 			 * If this message illicited a response, transition
3472 			 * to the Message in phase and send it.
3473 			 */
3474 			if (ahc->msgout_len != 0) {
3475 				ahc_outb(ahc, SCSISIGO, P_MESGIN | BSYO);
3476 				ahc_outb(ahc, SXFRCTL0,
3477 					 ahc_inb(ahc, SXFRCTL0) | SPIOEN);
3478 				ahc->msg_type = MSG_TYPE_TARGET_MSGIN;
3479 				ahc->msgin_index = 0;
3480 				break;
3481 			}
3482 		}
3483 
3484 		if (lastbyte)
3485 			end_session = TRUE;
3486 		else {
3487 			/* Ask for the next byte. */
3488 			ahc_outb(ahc, SXFRCTL0,
3489 				 ahc_inb(ahc, SXFRCTL0) | SPIOEN);
3490 		}
3491 
3492 		break;
3493 	}
3494 	default:
3495 		panic("Unknown REQINIT message type");
3496 	}
3497 
3498 	if (end_session) {
3499 		ahc_clear_msg_state(ahc);
3500 		ahc_outb(ahc, RETURN_1, EXIT_MSG_LOOP);
3501 	} else
3502 		ahc_outb(ahc, RETURN_1, CONT_MSG_LOOP);
3503 }
3504 
3505 /*
3506  * See if we sent a particular extended message to the target.
3507  * If "full" is true, return true only if the target saw the full
3508  * message.  If "full" is false, return true if the target saw at
3509  * least the first byte of the message.
3510  */
3511 static int
3512 ahc_sent_msg(struct ahc_softc *ahc, ahc_msgtype type, u_int msgval, int full)
3513 {
3514 	int found;
3515 	u_int index;
3516 
3517 	found = FALSE;
3518 	index = 0;
3519 
3520 	while (index < ahc->msgout_len) {
3521 		if (ahc->msgout_buf[index] == EXTENDED_MESSAGE) {
3522 			u_int end_index;
3523 
3524 			end_index = index + 1 + ahc->msgout_buf[index + 1];
3525 			if (ahc->msgout_buf[index+2] == msgval
3526 			 && type == AHCMSG_EXT) {
3527 
3528 				if (full) {
3529 					if (ahc->msgout_index > end_index)
3530 						found = TRUE;
3531 				} else if (ahc->msgout_index > index)
3532 					found = TRUE;
3533 			}
3534 			index = end_index;
3535 		} else if (ahc->msgout_buf[index] >= SIMPLE_QUEUE_TAG
3536 			&& ahc->msgout_buf[index] <= IGNORE_WIDE_RESIDUE) {
3537 
3538 			/* Skip tag type and tag id or residue param*/
3539 			index += 2;
3540 		} else {
3541 			/* Single byte message */
3542 			if (type == AHCMSG_1B
3543 			 && ahc->msgout_buf[index] == msgval
3544 			 && ahc->msgout_index > index)
3545 				found = TRUE;
3546 			index++;
3547 		}
3548 
3549 		if (found)
3550 			break;
3551 	}
3552 	return (found);
3553 }
3554 
3555 /*
3556  * Wait for a complete incoming message, parse it, and respond accordingly.
3557  */
3558 static int
3559 ahc_parse_msg(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
3560 {
3561 	struct	ahc_initiator_tinfo *tinfo;
3562 	struct	ahc_tmode_tstate *tstate;
3563 	int	reject;
3564 	int	done;
3565 	int	response;
3566 	u_int	targ_scsirate;
3567 
3568 	done = MSGLOOP_IN_PROG;
3569 	response = FALSE;
3570 	reject = FALSE;
3571 	tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
3572 				    devinfo->target, &tstate);
3573 	targ_scsirate = tinfo->scsirate;
3574 
3575 	/*
3576 	 * Parse as much of the message as is available,
3577 	 * rejecting it if we don't support it.  When
3578 	 * the entire message is available and has been
3579 	 * handled, return MSGLOOP_MSGCOMPLETE, indicating
3580 	 * that we have parsed an entire message.
3581 	 *
3582 	 * In the case of extended messages, we accept the length
3583 	 * byte outright and perform more checking once we know the
3584 	 * extended message type.
3585 	 */
3586 	switch (ahc->msgin_buf[0]) {
3587 	case DISCONNECT:
3588 	case SAVE_POINTERS:
3589 	case COMMAND_COMPLETE:
3590 	case RESTORE_POINTERS:
3591 	case IGNORE_WIDE_RESIDUE:
3592 		/*
3593 		 * End our message loop as these are messages
3594 		 * the sequencer handles on its own.
3595 		 */
3596 		done = MSGLOOP_TERMINATED;
3597 		break;
3598 	case MESSAGE_REJECT:
3599 		response = ahc_handle_msg_reject(ahc, devinfo);
3600 		fallthrough;
3601 	case NOP:
3602 		done = MSGLOOP_MSGCOMPLETE;
3603 		break;
3604 	case EXTENDED_MESSAGE:
3605 	{
3606 		/* Wait for enough of the message to begin validation */
3607 		if (ahc->msgin_index < 2)
3608 			break;
3609 		switch (ahc->msgin_buf[2]) {
3610 		case EXTENDED_SDTR:
3611 		{
3612 			const struct ahc_syncrate *syncrate;
3613 			u_int	 period;
3614 			u_int	 ppr_options;
3615 			u_int	 offset;
3616 			u_int	 saved_offset;
3617 
3618 			if (ahc->msgin_buf[1] != MSG_EXT_SDTR_LEN) {
3619 				reject = TRUE;
3620 				break;
3621 			}
3622 
3623 			/*
3624 			 * Wait until we have both args before validating
3625 			 * and acting on this message.
3626 			 *
3627 			 * Add one to MSG_EXT_SDTR_LEN to account for
3628 			 * the extended message preamble.
3629 			 */
3630 			if (ahc->msgin_index < (MSG_EXT_SDTR_LEN + 1))
3631 				break;
3632 
3633 			period = ahc->msgin_buf[3];
3634 			ppr_options = 0;
3635 			saved_offset = offset = ahc->msgin_buf[4];
3636 			syncrate = ahc_devlimited_syncrate(ahc, tinfo, &period,
3637 							   &ppr_options,
3638 							   devinfo->role);
3639 			ahc_validate_offset(ahc, tinfo, syncrate, &offset,
3640 					    targ_scsirate & WIDEXFER,
3641 					    devinfo->role);
3642 			if (bootverbose) {
3643 				printk("(%s:%c:%d:%d): Received "
3644 				       "SDTR period %x, offset %x\n\t"
3645 				       "Filtered to period %x, offset %x\n",
3646 				       ahc_name(ahc), devinfo->channel,
3647 				       devinfo->target, devinfo->lun,
3648 				       ahc->msgin_buf[3], saved_offset,
3649 				       period, offset);
3650 			}
3651 			ahc_set_syncrate(ahc, devinfo,
3652 					 syncrate, period,
3653 					 offset, ppr_options,
3654 					 AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3655 					 /*paused*/TRUE);
3656 
3657 			/*
3658 			 * See if we initiated Sync Negotiation
3659 			 * and didn't have to fall down to async
3660 			 * transfers.
3661 			 */
3662 			if (ahc_sent_msg(ahc, AHCMSG_EXT, EXTENDED_SDTR, TRUE)) {
3663 				/* We started it */
3664 				if (saved_offset != offset) {
3665 					/* Went too low - force async */
3666 					reject = TRUE;
3667 				}
3668 			} else {
3669 				/*
3670 				 * Send our own SDTR in reply
3671 				 */
3672 				if (bootverbose
3673 				 && devinfo->role == ROLE_INITIATOR) {
3674 					printk("(%s:%c:%d:%d): Target "
3675 					       "Initiated SDTR\n",
3676 					       ahc_name(ahc), devinfo->channel,
3677 					       devinfo->target, devinfo->lun);
3678 				}
3679 				ahc->msgout_index = 0;
3680 				ahc->msgout_len = 0;
3681 				ahc_construct_sdtr(ahc, devinfo,
3682 						   period, offset);
3683 				ahc->msgout_index = 0;
3684 				response = TRUE;
3685 			}
3686 			done = MSGLOOP_MSGCOMPLETE;
3687 			break;
3688 		}
3689 		case EXTENDED_WDTR:
3690 		{
3691 			u_int bus_width;
3692 			u_int saved_width;
3693 			u_int sending_reply;
3694 
3695 			sending_reply = FALSE;
3696 			if (ahc->msgin_buf[1] != MSG_EXT_WDTR_LEN) {
3697 				reject = TRUE;
3698 				break;
3699 			}
3700 
3701 			/*
3702 			 * Wait until we have our arg before validating
3703 			 * and acting on this message.
3704 			 *
3705 			 * Add one to MSG_EXT_WDTR_LEN to account for
3706 			 * the extended message preamble.
3707 			 */
3708 			if (ahc->msgin_index < (MSG_EXT_WDTR_LEN + 1))
3709 				break;
3710 
3711 			bus_width = ahc->msgin_buf[3];
3712 			saved_width = bus_width;
3713 			ahc_validate_width(ahc, tinfo, &bus_width,
3714 					   devinfo->role);
3715 			if (bootverbose) {
3716 				printk("(%s:%c:%d:%d): Received WDTR "
3717 				       "%x filtered to %x\n",
3718 				       ahc_name(ahc), devinfo->channel,
3719 				       devinfo->target, devinfo->lun,
3720 				       saved_width, bus_width);
3721 			}
3722 
3723 			if (ahc_sent_msg(ahc, AHCMSG_EXT, EXTENDED_WDTR, TRUE)) {
3724 				/*
3725 				 * Don't send a WDTR back to the
3726 				 * target, since we asked first.
3727 				 * If the width went higher than our
3728 				 * request, reject it.
3729 				 */
3730 				if (saved_width > bus_width) {
3731 					reject = TRUE;
3732 					printk("(%s:%c:%d:%d): requested %dBit "
3733 					       "transfers.  Rejecting...\n",
3734 					       ahc_name(ahc), devinfo->channel,
3735 					       devinfo->target, devinfo->lun,
3736 					       8 * (0x01 << bus_width));
3737 					bus_width = 0;
3738 				}
3739 			} else {
3740 				/*
3741 				 * Send our own WDTR in reply
3742 				 */
3743 				if (bootverbose
3744 				 && devinfo->role == ROLE_INITIATOR) {
3745 					printk("(%s:%c:%d:%d): Target "
3746 					       "Initiated WDTR\n",
3747 					       ahc_name(ahc), devinfo->channel,
3748 					       devinfo->target, devinfo->lun);
3749 				}
3750 				ahc->msgout_index = 0;
3751 				ahc->msgout_len = 0;
3752 				ahc_construct_wdtr(ahc, devinfo, bus_width);
3753 				ahc->msgout_index = 0;
3754 				response = TRUE;
3755 				sending_reply = TRUE;
3756 			}
3757 			/*
3758 			 * After a wide message, we are async, but
3759 			 * some devices don't seem to honor this portion
3760 			 * of the spec.  Force a renegotiation of the
3761 			 * sync component of our transfer agreement even
3762 			 * if our goal is async.  By updating our width
3763 			 * after forcing the negotiation, we avoid
3764 			 * renegotiating for width.
3765 			 */
3766 			ahc_update_neg_request(ahc, devinfo, tstate,
3767 					       tinfo, AHC_NEG_ALWAYS);
3768 			ahc_set_width(ahc, devinfo, bus_width,
3769 				      AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3770 				      /*paused*/TRUE);
3771 			if (sending_reply == FALSE && reject == FALSE) {
3772 
3773 				/*
3774 				 * We will always have an SDTR to send.
3775 				 */
3776 				ahc->msgout_index = 0;
3777 				ahc->msgout_len = 0;
3778 				ahc_build_transfer_msg(ahc, devinfo);
3779 				ahc->msgout_index = 0;
3780 				response = TRUE;
3781 			}
3782 			done = MSGLOOP_MSGCOMPLETE;
3783 			break;
3784 		}
3785 		case EXTENDED_PPR:
3786 		{
3787 			const struct ahc_syncrate *syncrate;
3788 			u_int	period;
3789 			u_int	offset;
3790 			u_int	bus_width;
3791 			u_int	ppr_options;
3792 			u_int	saved_width;
3793 			u_int	saved_offset;
3794 			u_int	saved_ppr_options;
3795 
3796 			if (ahc->msgin_buf[1] != MSG_EXT_PPR_LEN) {
3797 				reject = TRUE;
3798 				break;
3799 			}
3800 
3801 			/*
3802 			 * Wait until we have all args before validating
3803 			 * and acting on this message.
3804 			 *
3805 			 * Add one to MSG_EXT_PPR_LEN to account for
3806 			 * the extended message preamble.
3807 			 */
3808 			if (ahc->msgin_index < (MSG_EXT_PPR_LEN + 1))
3809 				break;
3810 
3811 			period = ahc->msgin_buf[3];
3812 			offset = ahc->msgin_buf[5];
3813 			bus_width = ahc->msgin_buf[6];
3814 			saved_width = bus_width;
3815 			ppr_options = ahc->msgin_buf[7];
3816 			/*
3817 			 * According to the spec, a DT only
3818 			 * period factor with no DT option
3819 			 * set implies async.
3820 			 */
3821 			if ((ppr_options & MSG_EXT_PPR_DT_REQ) == 0
3822 			 && period == 9)
3823 				offset = 0;
3824 			saved_ppr_options = ppr_options;
3825 			saved_offset = offset;
3826 
3827 			/*
3828 			 * Mask out any options we don't support
3829 			 * on any controller.  Transfer options are
3830 			 * only available if we are negotiating wide.
3831 			 */
3832 			ppr_options &= MSG_EXT_PPR_DT_REQ;
3833 			if (bus_width == 0)
3834 				ppr_options = 0;
3835 
3836 			ahc_validate_width(ahc, tinfo, &bus_width,
3837 					   devinfo->role);
3838 			syncrate = ahc_devlimited_syncrate(ahc, tinfo, &period,
3839 							   &ppr_options,
3840 							   devinfo->role);
3841 			ahc_validate_offset(ahc, tinfo, syncrate,
3842 					    &offset, bus_width,
3843 					    devinfo->role);
3844 
3845 			if (ahc_sent_msg(ahc, AHCMSG_EXT, EXTENDED_PPR, TRUE)) {
3846 				/*
3847 				 * If we are unable to do any of the
3848 				 * requested options (we went too low),
3849 				 * then we'll have to reject the message.
3850 				 */
3851 				if (saved_width > bus_width
3852 				 || saved_offset != offset
3853 				 || saved_ppr_options != ppr_options) {
3854 					reject = TRUE;
3855 					period = 0;
3856 					offset = 0;
3857 					bus_width = 0;
3858 					ppr_options = 0;
3859 					syncrate = NULL;
3860 				}
3861 			} else {
3862 				if (devinfo->role != ROLE_TARGET)
3863 					printk("(%s:%c:%d:%d): Target "
3864 					       "Initiated PPR\n",
3865 					       ahc_name(ahc), devinfo->channel,
3866 					       devinfo->target, devinfo->lun);
3867 				else
3868 					printk("(%s:%c:%d:%d): Initiator "
3869 					       "Initiated PPR\n",
3870 					       ahc_name(ahc), devinfo->channel,
3871 					       devinfo->target, devinfo->lun);
3872 				ahc->msgout_index = 0;
3873 				ahc->msgout_len = 0;
3874 				ahc_construct_ppr(ahc, devinfo, period, offset,
3875 						  bus_width, ppr_options);
3876 				ahc->msgout_index = 0;
3877 				response = TRUE;
3878 			}
3879 			if (bootverbose) {
3880 				printk("(%s:%c:%d:%d): Received PPR width %x, "
3881 				       "period %x, offset %x,options %x\n"
3882 				       "\tFiltered to width %x, period %x, "
3883 				       "offset %x, options %x\n",
3884 				       ahc_name(ahc), devinfo->channel,
3885 				       devinfo->target, devinfo->lun,
3886 				       saved_width, ahc->msgin_buf[3],
3887 				       saved_offset, saved_ppr_options,
3888 				       bus_width, period, offset, ppr_options);
3889 			}
3890 			ahc_set_width(ahc, devinfo, bus_width,
3891 				      AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3892 				      /*paused*/TRUE);
3893 			ahc_set_syncrate(ahc, devinfo,
3894 					 syncrate, period,
3895 					 offset, ppr_options,
3896 					 AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3897 					 /*paused*/TRUE);
3898 			done = MSGLOOP_MSGCOMPLETE;
3899 			break;
3900 		}
3901 		default:
3902 			/* Unknown extended message.  Reject it. */
3903 			reject = TRUE;
3904 			break;
3905 		}
3906 		break;
3907 	}
3908 #ifdef AHC_TARGET_MODE
3909 	case TARGET_RESET:
3910 		ahc_handle_devreset(ahc, devinfo,
3911 				    CAM_BDR_SENT,
3912 				    "Bus Device Reset Received",
3913 				    /*verbose_level*/0);
3914 		ahc_restart(ahc);
3915 		done = MSGLOOP_TERMINATED;
3916 		break;
3917 	case ABORT_TASK:
3918 	case ABORT_TASK_SET:
3919 	case CLEAR_QUEUE_TASK_SET:
3920 	{
3921 		int tag;
3922 
3923 		/* Target mode messages */
3924 		if (devinfo->role != ROLE_TARGET) {
3925 			reject = TRUE;
3926 			break;
3927 		}
3928 		tag = SCB_LIST_NULL;
3929 		if (ahc->msgin_buf[0] == ABORT_TASK)
3930 			tag = ahc_inb(ahc, INITIATOR_TAG);
3931 		ahc_abort_scbs(ahc, devinfo->target, devinfo->channel,
3932 			       devinfo->lun, tag, ROLE_TARGET,
3933 			       CAM_REQ_ABORTED);
3934 
3935 		tstate = ahc->enabled_targets[devinfo->our_scsiid];
3936 		if (tstate != NULL) {
3937 			struct ahc_tmode_lstate* lstate;
3938 
3939 			lstate = tstate->enabled_luns[devinfo->lun];
3940 			if (lstate != NULL) {
3941 				ahc_queue_lstate_event(ahc, lstate,
3942 						       devinfo->our_scsiid,
3943 						       ahc->msgin_buf[0],
3944 						       /*arg*/tag);
3945 				ahc_send_lstate_events(ahc, lstate);
3946 			}
3947 		}
3948 		ahc_restart(ahc);
3949 		done = MSGLOOP_TERMINATED;
3950 		break;
3951 	}
3952 #endif
3953 	case TERMINATE_IO_PROC:
3954 	default:
3955 		reject = TRUE;
3956 		break;
3957 	}
3958 
3959 	if (reject) {
3960 		/*
3961 		 * Setup to reject the message.
3962 		 */
3963 		ahc->msgout_index = 0;
3964 		ahc->msgout_len = 1;
3965 		ahc->msgout_buf[0] = MESSAGE_REJECT;
3966 		done = MSGLOOP_MSGCOMPLETE;
3967 		response = TRUE;
3968 	}
3969 
3970 	if (done != MSGLOOP_IN_PROG && !response)
3971 		/* Clear the outgoing message buffer */
3972 		ahc->msgout_len = 0;
3973 
3974 	return (done);
3975 }
3976 
3977 /*
3978  * Process a message reject message.
3979  */
3980 static int
3981 ahc_handle_msg_reject(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
3982 {
3983 	/*
3984 	 * What we care about here is if we had an
3985 	 * outstanding SDTR or WDTR message for this
3986 	 * target.  If we did, this is a signal that
3987 	 * the target is refusing negotiation.
3988 	 */
3989 	struct scb *scb;
3990 	struct ahc_initiator_tinfo *tinfo;
3991 	struct ahc_tmode_tstate *tstate;
3992 	u_int scb_index;
3993 	u_int last_msg;
3994 	int   response = 0;
3995 
3996 	scb_index = ahc_inb(ahc, SCB_TAG);
3997 	scb = ahc_lookup_scb(ahc, scb_index);
3998 	tinfo = ahc_fetch_transinfo(ahc, devinfo->channel,
3999 				    devinfo->our_scsiid,
4000 				    devinfo->target, &tstate);
4001 	/* Might be necessary */
4002 	last_msg = ahc_inb(ahc, LAST_MSG);
4003 
4004 	if (ahc_sent_msg(ahc, AHCMSG_EXT, EXTENDED_PPR, /*full*/FALSE)) {
4005 		/*
4006 		 * Target does not support the PPR message.
4007 		 * Attempt to negotiate SPI-2 style.
4008 		 */
4009 		if (bootverbose) {
4010 			printk("(%s:%c:%d:%d): PPR Rejected. "
4011 			       "Trying WDTR/SDTR\n",
4012 			       ahc_name(ahc), devinfo->channel,
4013 			       devinfo->target, devinfo->lun);
4014 		}
4015 		tinfo->goal.ppr_options = 0;
4016 		tinfo->curr.transport_version = 2;
4017 		tinfo->goal.transport_version = 2;
4018 		ahc->msgout_index = 0;
4019 		ahc->msgout_len = 0;
4020 		ahc_build_transfer_msg(ahc, devinfo);
4021 		ahc->msgout_index = 0;
4022 		response = 1;
4023 	} else if (ahc_sent_msg(ahc, AHCMSG_EXT, EXTENDED_WDTR, /*full*/FALSE)) {
4024 
4025 		/* note 8bit xfers */
4026 		printk("(%s:%c:%d:%d): refuses WIDE negotiation.  Using "
4027 		       "8bit transfers\n", ahc_name(ahc),
4028 		       devinfo->channel, devinfo->target, devinfo->lun);
4029 		ahc_set_width(ahc, devinfo, MSG_EXT_WDTR_BUS_8_BIT,
4030 			      AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
4031 			      /*paused*/TRUE);
4032 		/*
4033 		 * No need to clear the sync rate.  If the target
4034 		 * did not accept the command, our syncrate is
4035 		 * unaffected.  If the target started the negotiation,
4036 		 * but rejected our response, we already cleared the
4037 		 * sync rate before sending our WDTR.
4038 		 */
4039 		if (tinfo->goal.offset != tinfo->curr.offset) {
4040 
4041 			/* Start the sync negotiation */
4042 			ahc->msgout_index = 0;
4043 			ahc->msgout_len = 0;
4044 			ahc_build_transfer_msg(ahc, devinfo);
4045 			ahc->msgout_index = 0;
4046 			response = 1;
4047 		}
4048 	} else if (ahc_sent_msg(ahc, AHCMSG_EXT, EXTENDED_SDTR, /*full*/FALSE)) {
4049 		/* note asynch xfers and clear flag */
4050 		ahc_set_syncrate(ahc, devinfo, /*syncrate*/NULL, /*period*/0,
4051 				 /*offset*/0, /*ppr_options*/0,
4052 				 AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
4053 				 /*paused*/TRUE);
4054 		printk("(%s:%c:%d:%d): refuses synchronous negotiation. "
4055 		       "Using asynchronous transfers\n",
4056 		       ahc_name(ahc), devinfo->channel,
4057 		       devinfo->target, devinfo->lun);
4058 	} else if ((scb->hscb->control & SIMPLE_QUEUE_TAG) != 0) {
4059 		int tag_type;
4060 		int mask;
4061 
4062 		tag_type = (scb->hscb->control & SIMPLE_QUEUE_TAG);
4063 
4064 		if (tag_type == SIMPLE_QUEUE_TAG) {
4065 			printk("(%s:%c:%d:%d): refuses tagged commands.  "
4066 			       "Performing non-tagged I/O\n", ahc_name(ahc),
4067 			       devinfo->channel, devinfo->target, devinfo->lun);
4068 			ahc_set_tags(ahc, scb->io_ctx, devinfo, AHC_QUEUE_NONE);
4069 			mask = ~0x23;
4070 		} else {
4071 			printk("(%s:%c:%d:%d): refuses %s tagged commands.  "
4072 			       "Performing simple queue tagged I/O only\n",
4073 			       ahc_name(ahc), devinfo->channel, devinfo->target,
4074 			       devinfo->lun, tag_type == ORDERED_QUEUE_TAG
4075 			       ? "ordered" : "head of queue");
4076 			ahc_set_tags(ahc, scb->io_ctx, devinfo, AHC_QUEUE_BASIC);
4077 			mask = ~0x03;
4078 		}
4079 
4080 		/*
4081 		 * Resend the identify for this CCB as the target
4082 		 * may believe that the selection is invalid otherwise.
4083 		 */
4084 		ahc_outb(ahc, SCB_CONTROL,
4085 			 ahc_inb(ahc, SCB_CONTROL) & mask);
4086 		scb->hscb->control &= mask;
4087 		ahc_set_transaction_tag(scb, /*enabled*/FALSE,
4088 					/*type*/SIMPLE_QUEUE_TAG);
4089 		ahc_outb(ahc, MSG_OUT, MSG_IDENTIFYFLAG);
4090 		ahc_assert_atn(ahc);
4091 
4092 		/*
4093 		 * This transaction is now at the head of
4094 		 * the untagged queue for this target.
4095 		 */
4096 		if ((ahc->flags & AHC_SCB_BTT) == 0) {
4097 			struct scb_tailq *untagged_q;
4098 
4099 			untagged_q =
4100 			    &(ahc->untagged_queues[devinfo->target_offset]);
4101 			TAILQ_INSERT_HEAD(untagged_q, scb, links.tqe);
4102 			scb->flags |= SCB_UNTAGGEDQ;
4103 		}
4104 		ahc_busy_tcl(ahc, BUILD_TCL(scb->hscb->scsiid, devinfo->lun),
4105 			     scb->hscb->tag);
4106 
4107 		/*
4108 		 * Requeue all tagged commands for this target
4109 		 * currently in our possession so they can be
4110 		 * converted to untagged commands.
4111 		 */
4112 		ahc_search_qinfifo(ahc, SCB_GET_TARGET(ahc, scb),
4113 				   SCB_GET_CHANNEL(ahc, scb),
4114 				   SCB_GET_LUN(scb), /*tag*/SCB_LIST_NULL,
4115 				   ROLE_INITIATOR, CAM_REQUEUE_REQ,
4116 				   SEARCH_COMPLETE);
4117 	} else {
4118 		/*
4119 		 * Otherwise, we ignore it.
4120 		 */
4121 		printk("%s:%c:%d: Message reject for %x -- ignored\n",
4122 		       ahc_name(ahc), devinfo->channel, devinfo->target,
4123 		       last_msg);
4124 	}
4125 	return (response);
4126 }
4127 
4128 /*
4129  * Process an ingnore wide residue message.
4130  */
4131 static void
4132 ahc_handle_ign_wide_residue(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
4133 {
4134 	u_int scb_index;
4135 	struct scb *scb;
4136 
4137 	scb_index = ahc_inb(ahc, SCB_TAG);
4138 	scb = ahc_lookup_scb(ahc, scb_index);
4139 	/*
4140 	 * XXX Actually check data direction in the sequencer?
4141 	 * Perhaps add datadir to some spare bits in the hscb?
4142 	 */
4143 	if ((ahc_inb(ahc, SEQ_FLAGS) & DPHASE) == 0
4144 	 || ahc_get_transfer_dir(scb) != CAM_DIR_IN) {
4145 		/*
4146 		 * Ignore the message if we haven't
4147 		 * seen an appropriate data phase yet.
4148 		 */
4149 	} else {
4150 		/*
4151 		 * If the residual occurred on the last
4152 		 * transfer and the transfer request was
4153 		 * expected to end on an odd count, do
4154 		 * nothing.  Otherwise, subtract a byte
4155 		 * and update the residual count accordingly.
4156 		 */
4157 		uint32_t sgptr;
4158 
4159 		sgptr = ahc_inb(ahc, SCB_RESIDUAL_SGPTR);
4160 		if ((sgptr & SG_LIST_NULL) != 0
4161 		 && (ahc_inb(ahc, SCB_LUN) & SCB_XFERLEN_ODD) != 0) {
4162 			/*
4163 			 * If the residual occurred on the last
4164 			 * transfer and the transfer request was
4165 			 * expected to end on an odd count, do
4166 			 * nothing.
4167 			 */
4168 		} else {
4169 			struct ahc_dma_seg *sg;
4170 			uint32_t data_cnt;
4171 			uint32_t data_addr;
4172 			uint32_t sglen;
4173 
4174 			/* Pull in all of the sgptr */
4175 			sgptr = ahc_inl(ahc, SCB_RESIDUAL_SGPTR);
4176 			data_cnt = ahc_inl(ahc, SCB_RESIDUAL_DATACNT);
4177 
4178 			if ((sgptr & SG_LIST_NULL) != 0) {
4179 				/*
4180 				 * The residual data count is not updated
4181 				 * for the command run to completion case.
4182 				 * Explicitly zero the count.
4183 				 */
4184 				data_cnt &= ~AHC_SG_LEN_MASK;
4185 			}
4186 
4187 			data_addr = ahc_inl(ahc, SHADDR);
4188 
4189 			data_cnt += 1;
4190 			data_addr -= 1;
4191 			sgptr &= SG_PTR_MASK;
4192 
4193 			sg = ahc_sg_bus_to_virt(scb, sgptr);
4194 
4195 			/*
4196 			 * The residual sg ptr points to the next S/G
4197 			 * to load so we must go back one.
4198 			 */
4199 			sg--;
4200 			sglen = ahc_le32toh(sg->len) & AHC_SG_LEN_MASK;
4201 			if (sg != scb->sg_list
4202 			 && sglen < (data_cnt & AHC_SG_LEN_MASK)) {
4203 
4204 				sg--;
4205 				sglen = ahc_le32toh(sg->len);
4206 				/*
4207 				 * Preserve High Address and SG_LIST bits
4208 				 * while setting the count to 1.
4209 				 */
4210 				data_cnt = 1 | (sglen & (~AHC_SG_LEN_MASK));
4211 				data_addr = ahc_le32toh(sg->addr)
4212 					  + (sglen & AHC_SG_LEN_MASK) - 1;
4213 
4214 				/*
4215 				 * Increment sg so it points to the
4216 				 * "next" sg.
4217 				 */
4218 				sg++;
4219 				sgptr = ahc_sg_virt_to_bus(scb, sg);
4220 			}
4221 			ahc_outl(ahc, SCB_RESIDUAL_SGPTR, sgptr);
4222 			ahc_outl(ahc, SCB_RESIDUAL_DATACNT, data_cnt);
4223 			/*
4224 			 * Toggle the "oddness" of the transfer length
4225 			 * to handle this mid-transfer ignore wide
4226 			 * residue.  This ensures that the oddness is
4227 			 * correct for subsequent data transfers.
4228 			 */
4229 			ahc_outb(ahc, SCB_LUN,
4230 				 ahc_inb(ahc, SCB_LUN) ^ SCB_XFERLEN_ODD);
4231 		}
4232 	}
4233 }
4234 
4235 
4236 /*
4237  * Reinitialize the data pointers for the active transfer
4238  * based on its current residual.
4239  */
4240 static void
4241 ahc_reinitialize_dataptrs(struct ahc_softc *ahc)
4242 {
4243 	struct	 scb *scb;
4244 	struct	 ahc_dma_seg *sg;
4245 	u_int	 scb_index;
4246 	uint32_t sgptr;
4247 	uint32_t resid;
4248 	uint32_t dataptr;
4249 
4250 	scb_index = ahc_inb(ahc, SCB_TAG);
4251 	scb = ahc_lookup_scb(ahc, scb_index);
4252 	sgptr = (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 3) << 24)
4253 	      | (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 2) << 16)
4254 	      | (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 1) << 8)
4255 	      |	ahc_inb(ahc, SCB_RESIDUAL_SGPTR);
4256 
4257 	sgptr &= SG_PTR_MASK;
4258 	sg = ahc_sg_bus_to_virt(scb, sgptr);
4259 
4260 	/* The residual sg_ptr always points to the next sg */
4261 	sg--;
4262 
4263 	resid = (ahc_inb(ahc, SCB_RESIDUAL_DATACNT + 2) << 16)
4264 	      | (ahc_inb(ahc, SCB_RESIDUAL_DATACNT + 1) << 8)
4265 	      | ahc_inb(ahc, SCB_RESIDUAL_DATACNT);
4266 
4267 	dataptr = ahc_le32toh(sg->addr)
4268 		+ (ahc_le32toh(sg->len) & AHC_SG_LEN_MASK)
4269 		- resid;
4270 	if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
4271 		u_int dscommand1;
4272 
4273 		dscommand1 = ahc_inb(ahc, DSCOMMAND1);
4274 		ahc_outb(ahc, DSCOMMAND1, dscommand1 | HADDLDSEL0);
4275 		ahc_outb(ahc, HADDR,
4276 			 (ahc_le32toh(sg->len) >> 24) & SG_HIGH_ADDR_BITS);
4277 		ahc_outb(ahc, DSCOMMAND1, dscommand1);
4278 	}
4279 	ahc_outb(ahc, HADDR + 3, dataptr >> 24);
4280 	ahc_outb(ahc, HADDR + 2, dataptr >> 16);
4281 	ahc_outb(ahc, HADDR + 1, dataptr >> 8);
4282 	ahc_outb(ahc, HADDR, dataptr);
4283 	ahc_outb(ahc, HCNT + 2, resid >> 16);
4284 	ahc_outb(ahc, HCNT + 1, resid >> 8);
4285 	ahc_outb(ahc, HCNT, resid);
4286 	if ((ahc->features & AHC_ULTRA2) == 0) {
4287 		ahc_outb(ahc, STCNT + 2, resid >> 16);
4288 		ahc_outb(ahc, STCNT + 1, resid >> 8);
4289 		ahc_outb(ahc, STCNT, resid);
4290 	}
4291 }
4292 
4293 /*
4294  * Handle the effects of issuing a bus device reset message.
4295  */
4296 static void
4297 ahc_handle_devreset(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
4298 		    cam_status status, char *message, int verbose_level)
4299 {
4300 #ifdef AHC_TARGET_MODE
4301 	struct ahc_tmode_tstate* tstate;
4302 	u_int lun;
4303 #endif
4304 	int found;
4305 
4306 	found = ahc_abort_scbs(ahc, devinfo->target, devinfo->channel,
4307 			       CAM_LUN_WILDCARD, SCB_LIST_NULL, devinfo->role,
4308 			       status);
4309 
4310 #ifdef AHC_TARGET_MODE
4311 	/*
4312 	 * Send an immediate notify ccb to all target mord peripheral
4313 	 * drivers affected by this action.
4314 	 */
4315 	tstate = ahc->enabled_targets[devinfo->our_scsiid];
4316 	if (tstate != NULL) {
4317 		for (lun = 0; lun < AHC_NUM_LUNS; lun++) {
4318 			struct ahc_tmode_lstate* lstate;
4319 
4320 			lstate = tstate->enabled_luns[lun];
4321 			if (lstate == NULL)
4322 				continue;
4323 
4324 			ahc_queue_lstate_event(ahc, lstate, devinfo->our_scsiid,
4325 					       TARGET_RESET, /*arg*/0);
4326 			ahc_send_lstate_events(ahc, lstate);
4327 		}
4328 	}
4329 #endif
4330 
4331 	/*
4332 	 * Go back to async/narrow transfers and renegotiate.
4333 	 */
4334 	ahc_set_width(ahc, devinfo, MSG_EXT_WDTR_BUS_8_BIT,
4335 		      AHC_TRANS_CUR, /*paused*/TRUE);
4336 	ahc_set_syncrate(ahc, devinfo, /*syncrate*/NULL,
4337 			 /*period*/0, /*offset*/0, /*ppr_options*/0,
4338 			 AHC_TRANS_CUR, /*paused*/TRUE);
4339 
4340 	if (status != CAM_SEL_TIMEOUT)
4341 		ahc_send_async(ahc, devinfo->channel, devinfo->target,
4342 			       CAM_LUN_WILDCARD, AC_SENT_BDR);
4343 
4344 	if (message != NULL
4345 	 && (verbose_level <= bootverbose))
4346 		printk("%s: %s on %c:%d. %d SCBs aborted\n", ahc_name(ahc),
4347 		       message, devinfo->channel, devinfo->target, found);
4348 }
4349 
4350 #ifdef AHC_TARGET_MODE
4351 static void
4352 ahc_setup_target_msgin(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
4353 		       struct scb *scb)
4354 {
4355 
4356 	/*
4357 	 * To facilitate adding multiple messages together,
4358 	 * each routine should increment the index and len
4359 	 * variables instead of setting them explicitly.
4360 	 */
4361 	ahc->msgout_index = 0;
4362 	ahc->msgout_len = 0;
4363 
4364 	if (scb != NULL && (scb->flags & SCB_AUTO_NEGOTIATE) != 0)
4365 		ahc_build_transfer_msg(ahc, devinfo);
4366 	else
4367 		panic("ahc_intr: AWAITING target message with no message");
4368 
4369 	ahc->msgout_index = 0;
4370 	ahc->msg_type = MSG_TYPE_TARGET_MSGIN;
4371 }
4372 #endif
4373 /**************************** Initialization **********************************/
4374 /*
4375  * Allocate a controller structure for a new device
4376  * and perform initial initializion.
4377  */
4378 struct ahc_softc *
4379 ahc_alloc(void *platform_arg, char *name)
4380 {
4381 	struct  ahc_softc *ahc;
4382 	int	i;
4383 
4384 	ahc = kzalloc(sizeof(*ahc), GFP_ATOMIC);
4385 	if (!ahc) {
4386 		printk("aic7xxx: cannot malloc softc!\n");
4387 		kfree(name);
4388 		return NULL;
4389 	}
4390 
4391 	ahc->seep_config = kmalloc(sizeof(*ahc->seep_config), GFP_ATOMIC);
4392 	if (ahc->seep_config == NULL) {
4393 		kfree(ahc);
4394 		kfree(name);
4395 		return (NULL);
4396 	}
4397 	LIST_INIT(&ahc->pending_scbs);
4398 	/* We don't know our unit number until the OSM sets it */
4399 	ahc->name = name;
4400 	ahc->unit = -1;
4401 	ahc->description = NULL;
4402 	ahc->channel = 'A';
4403 	ahc->channel_b = 'B';
4404 	ahc->chip = AHC_NONE;
4405 	ahc->features = AHC_FENONE;
4406 	ahc->bugs = AHC_BUGNONE;
4407 	ahc->flags = AHC_FNONE;
4408 	/*
4409 	 * Default to all error reporting enabled with the
4410 	 * sequencer operating at its fastest speed.
4411 	 * The bus attach code may modify this.
4412 	 */
4413 	ahc->seqctl = FASTMODE;
4414 
4415 	for (i = 0; i < AHC_NUM_TARGETS; i++)
4416 		TAILQ_INIT(&ahc->untagged_queues[i]);
4417 	if (ahc_platform_alloc(ahc, platform_arg) != 0) {
4418 		ahc_free(ahc);
4419 		ahc = NULL;
4420 	}
4421 	return (ahc);
4422 }
4423 
4424 int
4425 ahc_softc_init(struct ahc_softc *ahc)
4426 {
4427 
4428 	/* The IRQMS bit is only valid on VL and EISA chips */
4429 	if ((ahc->chip & AHC_PCI) == 0)
4430 		ahc->unpause = ahc_inb(ahc, HCNTRL) & IRQMS;
4431 	else
4432 		ahc->unpause = 0;
4433 	ahc->pause = ahc->unpause | PAUSE;
4434 	/* XXX The shared scb data stuff should be deprecated */
4435 	if (ahc->scb_data == NULL) {
4436 		ahc->scb_data = kzalloc(sizeof(*ahc->scb_data), GFP_ATOMIC);
4437 		if (ahc->scb_data == NULL)
4438 			return (ENOMEM);
4439 	}
4440 
4441 	return (0);
4442 }
4443 
4444 void
4445 ahc_set_unit(struct ahc_softc *ahc, int unit)
4446 {
4447 	ahc->unit = unit;
4448 }
4449 
4450 void
4451 ahc_set_name(struct ahc_softc *ahc, char *name)
4452 {
4453 	kfree(ahc->name);
4454 	ahc->name = name;
4455 }
4456 
4457 void
4458 ahc_free(struct ahc_softc *ahc)
4459 {
4460 	int i;
4461 
4462 	switch (ahc->init_level) {
4463 	default:
4464 	case 5:
4465 		ahc_shutdown(ahc);
4466 		fallthrough;
4467 	case 4:
4468 		ahc_dmamap_unload(ahc, ahc->shared_data_dmat,
4469 				  ahc->shared_data_dmamap);
4470 		fallthrough;
4471 	case 3:
4472 		ahc_dmamem_free(ahc, ahc->shared_data_dmat, ahc->qoutfifo,
4473 				ahc->shared_data_dmamap);
4474 		ahc_dmamap_destroy(ahc, ahc->shared_data_dmat,
4475 				   ahc->shared_data_dmamap);
4476 		fallthrough;
4477 	case 2:
4478 		ahc_dma_tag_destroy(ahc, ahc->shared_data_dmat);
4479 		fallthrough;
4480 	case 1:
4481 		break;
4482 	case 0:
4483 		break;
4484 	}
4485 
4486 	ahc_platform_free(ahc);
4487 	ahc_fini_scbdata(ahc);
4488 	for (i = 0; i < AHC_NUM_TARGETS; i++) {
4489 		struct ahc_tmode_tstate *tstate;
4490 
4491 		tstate = ahc->enabled_targets[i];
4492 		if (tstate != NULL) {
4493 #ifdef AHC_TARGET_MODE
4494 			int j;
4495 
4496 			for (j = 0; j < AHC_NUM_LUNS; j++) {
4497 				struct ahc_tmode_lstate *lstate;
4498 
4499 				lstate = tstate->enabled_luns[j];
4500 				if (lstate != NULL) {
4501 					xpt_free_path(lstate->path);
4502 					kfree(lstate);
4503 				}
4504 			}
4505 #endif
4506 			kfree(tstate);
4507 		}
4508 	}
4509 #ifdef AHC_TARGET_MODE
4510 	if (ahc->black_hole != NULL) {
4511 		xpt_free_path(ahc->black_hole->path);
4512 		kfree(ahc->black_hole);
4513 	}
4514 #endif
4515 	kfree(ahc->name);
4516 	kfree(ahc->seep_config);
4517 	kfree(ahc);
4518 	return;
4519 }
4520 
4521 static void
4522 ahc_shutdown(void *arg)
4523 {
4524 	struct	ahc_softc *ahc;
4525 	int	i;
4526 
4527 	ahc = (struct ahc_softc *)arg;
4528 
4529 	/* This will reset most registers to 0, but not all */
4530 	ahc_reset(ahc, /*reinit*/FALSE);
4531 	ahc_outb(ahc, SCSISEQ, 0);
4532 	ahc_outb(ahc, SXFRCTL0, 0);
4533 	ahc_outb(ahc, DSPCISTATUS, 0);
4534 
4535 	for (i = TARG_SCSIRATE; i < SCSICONF; i++)
4536 		ahc_outb(ahc, i, 0);
4537 }
4538 
4539 /*
4540  * Reset the controller and record some information about it
4541  * that is only available just after a reset.  If "reinit" is
4542  * non-zero, this reset occurred after initial configuration
4543  * and the caller requests that the chip be fully reinitialized
4544  * to a runable state.  Chip interrupts are *not* enabled after
4545  * a reinitialization.  The caller must enable interrupts via
4546  * ahc_intr_enable().
4547  */
4548 int
4549 ahc_reset(struct ahc_softc *ahc, int reinit)
4550 {
4551 	u_int	sblkctl;
4552 	u_int	sxfrctl1_a, sxfrctl1_b;
4553 	int	error;
4554 	int	wait;
4555 
4556 	/*
4557 	 * Preserve the value of the SXFRCTL1 register for all channels.
4558 	 * It contains settings that affect termination and we don't want
4559 	 * to disturb the integrity of the bus.
4560 	 */
4561 	ahc_pause(ahc);
4562 	sxfrctl1_b = 0;
4563 	if ((ahc->chip & AHC_CHIPID_MASK) == AHC_AIC7770) {
4564 		u_int sblkctl;
4565 
4566 		/*
4567 		 * Save channel B's settings in case this chip
4568 		 * is setup for TWIN channel operation.
4569 		 */
4570 		sblkctl = ahc_inb(ahc, SBLKCTL);
4571 		ahc_outb(ahc, SBLKCTL, sblkctl | SELBUSB);
4572 		sxfrctl1_b = ahc_inb(ahc, SXFRCTL1);
4573 		ahc_outb(ahc, SBLKCTL, sblkctl & ~SELBUSB);
4574 	}
4575 	sxfrctl1_a = ahc_inb(ahc, SXFRCTL1);
4576 
4577 	ahc_outb(ahc, HCNTRL, CHIPRST | ahc->pause);
4578 
4579 	/*
4580 	 * Ensure that the reset has finished.  We delay 1000us
4581 	 * prior to reading the register to make sure the chip
4582 	 * has sufficiently completed its reset to handle register
4583 	 * accesses.
4584 	 */
4585 	wait = 1000;
4586 	do {
4587 		ahc_delay(1000);
4588 	} while (--wait && !(ahc_inb(ahc, HCNTRL) & CHIPRSTACK));
4589 
4590 	if (wait == 0) {
4591 		printk("%s: WARNING - Failed chip reset!  "
4592 		       "Trying to initialize anyway.\n", ahc_name(ahc));
4593 	}
4594 	ahc_outb(ahc, HCNTRL, ahc->pause);
4595 
4596 	/* Determine channel configuration */
4597 	sblkctl = ahc_inb(ahc, SBLKCTL) & (SELBUSB|SELWIDE);
4598 	/* No Twin Channel PCI cards */
4599 	if ((ahc->chip & AHC_PCI) != 0)
4600 		sblkctl &= ~SELBUSB;
4601 	switch (sblkctl) {
4602 	case 0:
4603 		/* Single Narrow Channel */
4604 		break;
4605 	case 2:
4606 		/* Wide Channel */
4607 		ahc->features |= AHC_WIDE;
4608 		break;
4609 	case 8:
4610 		/* Twin Channel */
4611 		ahc->features |= AHC_TWIN;
4612 		break;
4613 	default:
4614 		printk(" Unsupported adapter type.  Ignoring\n");
4615 		return(-1);
4616 	}
4617 
4618 	/*
4619 	 * Reload sxfrctl1.
4620 	 *
4621 	 * We must always initialize STPWEN to 1 before we
4622 	 * restore the saved values.  STPWEN is initialized
4623 	 * to a tri-state condition which can only be cleared
4624 	 * by turning it on.
4625 	 */
4626 	if ((ahc->features & AHC_TWIN) != 0) {
4627 		u_int sblkctl;
4628 
4629 		sblkctl = ahc_inb(ahc, SBLKCTL);
4630 		ahc_outb(ahc, SBLKCTL, sblkctl | SELBUSB);
4631 		ahc_outb(ahc, SXFRCTL1, sxfrctl1_b);
4632 		ahc_outb(ahc, SBLKCTL, sblkctl & ~SELBUSB);
4633 	}
4634 	ahc_outb(ahc, SXFRCTL1, sxfrctl1_a);
4635 
4636 	error = 0;
4637 	if (reinit != 0)
4638 		/*
4639 		 * If a recovery action has forced a chip reset,
4640 		 * re-initialize the chip to our liking.
4641 		 */
4642 		error = ahc->bus_chip_init(ahc);
4643 #ifdef AHC_DUMP_SEQ
4644 	else
4645 		ahc_dumpseq(ahc);
4646 #endif
4647 
4648 	return (error);
4649 }
4650 
4651 /*
4652  * Determine the number of SCBs available on the controller
4653  */
4654 int
4655 ahc_probe_scbs(struct ahc_softc *ahc) {
4656 	int i;
4657 
4658 	for (i = 0; i < AHC_SCB_MAX; i++) {
4659 
4660 		ahc_outb(ahc, SCBPTR, i);
4661 		ahc_outb(ahc, SCB_BASE, i);
4662 		if (ahc_inb(ahc, SCB_BASE) != i)
4663 			break;
4664 		ahc_outb(ahc, SCBPTR, 0);
4665 		if (ahc_inb(ahc, SCB_BASE) != 0)
4666 			break;
4667 	}
4668 	return (i);
4669 }
4670 
4671 static void
4672 ahc_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
4673 {
4674 	dma_addr_t *baddr;
4675 
4676 	baddr = (dma_addr_t *)arg;
4677 	*baddr = segs->ds_addr;
4678 }
4679 
4680 static void
4681 ahc_build_free_scb_list(struct ahc_softc *ahc)
4682 {
4683 	int scbsize;
4684 	int i;
4685 
4686 	scbsize = 32;
4687 	if ((ahc->flags & AHC_LSCBS_ENABLED) != 0)
4688 		scbsize = 64;
4689 
4690 	for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
4691 		int j;
4692 
4693 		ahc_outb(ahc, SCBPTR, i);
4694 
4695 		/*
4696 		 * Touch all SCB bytes to avoid parity errors
4697 		 * should one of our debugging routines read
4698 		 * an otherwise uninitiatlized byte.
4699 		 */
4700 		for (j = 0; j < scbsize; j++)
4701 			ahc_outb(ahc, SCB_BASE+j, 0xFF);
4702 
4703 		/* Clear the control byte. */
4704 		ahc_outb(ahc, SCB_CONTROL, 0);
4705 
4706 		/* Set the next pointer */
4707 		if ((ahc->flags & AHC_PAGESCBS) != 0)
4708 			ahc_outb(ahc, SCB_NEXT, i+1);
4709 		else
4710 			ahc_outb(ahc, SCB_NEXT, SCB_LIST_NULL);
4711 
4712 		/* Make the tag number, SCSIID, and lun invalid */
4713 		ahc_outb(ahc, SCB_TAG, SCB_LIST_NULL);
4714 		ahc_outb(ahc, SCB_SCSIID, 0xFF);
4715 		ahc_outb(ahc, SCB_LUN, 0xFF);
4716 	}
4717 
4718 	if ((ahc->flags & AHC_PAGESCBS) != 0) {
4719 		/* SCB 0 heads the free list. */
4720 		ahc_outb(ahc, FREE_SCBH, 0);
4721 	} else {
4722 		/* No free list. */
4723 		ahc_outb(ahc, FREE_SCBH, SCB_LIST_NULL);
4724 	}
4725 
4726 	/* Make sure that the last SCB terminates the free list */
4727 	ahc_outb(ahc, SCBPTR, i-1);
4728 	ahc_outb(ahc, SCB_NEXT, SCB_LIST_NULL);
4729 }
4730 
4731 static int
4732 ahc_init_scbdata(struct ahc_softc *ahc)
4733 {
4734 	struct scb_data *scb_data;
4735 
4736 	scb_data = ahc->scb_data;
4737 	SLIST_INIT(&scb_data->free_scbs);
4738 	SLIST_INIT(&scb_data->sg_maps);
4739 
4740 	/* Allocate SCB resources */
4741 	scb_data->scbarray = kcalloc(AHC_SCB_MAX_ALLOC, sizeof(struct scb),
4742 				     GFP_ATOMIC);
4743 	if (scb_data->scbarray == NULL)
4744 		return (ENOMEM);
4745 
4746 	/* Determine the number of hardware SCBs and initialize them */
4747 
4748 	scb_data->maxhscbs = ahc_probe_scbs(ahc);
4749 	if (ahc->scb_data->maxhscbs == 0) {
4750 		printk("%s: No SCB space found\n", ahc_name(ahc));
4751 		return (ENXIO);
4752 	}
4753 
4754 	/*
4755 	 * Create our DMA tags.  These tags define the kinds of device
4756 	 * accessible memory allocations and memory mappings we will
4757 	 * need to perform during normal operation.
4758 	 *
4759 	 * Unless we need to further restrict the allocation, we rely
4760 	 * on the restrictions of the parent dmat, hence the common
4761 	 * use of MAXADDR and MAXSIZE.
4762 	 */
4763 
4764 	/* DMA tag for our hardware scb structures */
4765 	if (ahc_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/1,
4766 			       /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
4767 			       /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
4768 			       /*highaddr*/BUS_SPACE_MAXADDR,
4769 			       /*filter*/NULL, /*filterarg*/NULL,
4770 			       AHC_SCB_MAX_ALLOC * sizeof(struct hardware_scb),
4771 			       /*nsegments*/1,
4772 			       /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
4773 			       /*flags*/0, &scb_data->hscb_dmat) != 0) {
4774 		goto error_exit;
4775 	}
4776 
4777 	scb_data->init_level++;
4778 
4779 	/* Allocation for our hscbs */
4780 	if (ahc_dmamem_alloc(ahc, scb_data->hscb_dmat,
4781 			     (void **)&scb_data->hscbs,
4782 			     BUS_DMA_NOWAIT, &scb_data->hscb_dmamap) != 0) {
4783 		goto error_exit;
4784 	}
4785 
4786 	scb_data->init_level++;
4787 
4788 	/* And permanently map them */
4789 	ahc_dmamap_load(ahc, scb_data->hscb_dmat, scb_data->hscb_dmamap,
4790 			scb_data->hscbs,
4791 			AHC_SCB_MAX_ALLOC * sizeof(struct hardware_scb),
4792 			ahc_dmamap_cb, &scb_data->hscb_busaddr, /*flags*/0);
4793 
4794 	scb_data->init_level++;
4795 
4796 	/* DMA tag for our sense buffers */
4797 	if (ahc_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/1,
4798 			       /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
4799 			       /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
4800 			       /*highaddr*/BUS_SPACE_MAXADDR,
4801 			       /*filter*/NULL, /*filterarg*/NULL,
4802 			       AHC_SCB_MAX_ALLOC * sizeof(struct scsi_sense_data),
4803 			       /*nsegments*/1,
4804 			       /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
4805 			       /*flags*/0, &scb_data->sense_dmat) != 0) {
4806 		goto error_exit;
4807 	}
4808 
4809 	scb_data->init_level++;
4810 
4811 	/* Allocate them */
4812 	if (ahc_dmamem_alloc(ahc, scb_data->sense_dmat,
4813 			     (void **)&scb_data->sense,
4814 			     BUS_DMA_NOWAIT, &scb_data->sense_dmamap) != 0) {
4815 		goto error_exit;
4816 	}
4817 
4818 	scb_data->init_level++;
4819 
4820 	/* And permanently map them */
4821 	ahc_dmamap_load(ahc, scb_data->sense_dmat, scb_data->sense_dmamap,
4822 			scb_data->sense,
4823 			AHC_SCB_MAX_ALLOC * sizeof(struct scsi_sense_data),
4824 			ahc_dmamap_cb, &scb_data->sense_busaddr, /*flags*/0);
4825 
4826 	scb_data->init_level++;
4827 
4828 	/* DMA tag for our S/G structures.  We allocate in page sized chunks */
4829 	if (ahc_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/8,
4830 			       /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
4831 			       /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
4832 			       /*highaddr*/BUS_SPACE_MAXADDR,
4833 			       /*filter*/NULL, /*filterarg*/NULL,
4834 			       PAGE_SIZE, /*nsegments*/1,
4835 			       /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
4836 			       /*flags*/0, &scb_data->sg_dmat) != 0) {
4837 		goto error_exit;
4838 	}
4839 
4840 	scb_data->init_level++;
4841 
4842 	/* Perform initial CCB allocation */
4843 	memset(scb_data->hscbs, 0,
4844 	       AHC_SCB_MAX_ALLOC * sizeof(struct hardware_scb));
4845 	ahc_alloc_scbs(ahc);
4846 
4847 	if (scb_data->numscbs == 0) {
4848 		printk("%s: ahc_init_scbdata - "
4849 		       "Unable to allocate initial scbs\n",
4850 		       ahc_name(ahc));
4851 		goto error_exit;
4852 	}
4853 
4854 	/*
4855 	 * Reserve the next queued SCB.
4856 	 */
4857 	ahc->next_queued_scb = ahc_get_scb(ahc);
4858 
4859 	/*
4860 	 * Note that we were successful
4861 	 */
4862 	return (0);
4863 
4864 error_exit:
4865 
4866 	return (ENOMEM);
4867 }
4868 
4869 static void
4870 ahc_fini_scbdata(struct ahc_softc *ahc)
4871 {
4872 	struct scb_data *scb_data;
4873 
4874 	scb_data = ahc->scb_data;
4875 	if (scb_data == NULL)
4876 		return;
4877 
4878 	switch (scb_data->init_level) {
4879 	default:
4880 	case 7:
4881 	{
4882 		struct sg_map_node *sg_map;
4883 
4884 		while ((sg_map = SLIST_FIRST(&scb_data->sg_maps))!= NULL) {
4885 			SLIST_REMOVE_HEAD(&scb_data->sg_maps, links);
4886 			ahc_dmamap_unload(ahc, scb_data->sg_dmat,
4887 					  sg_map->sg_dmamap);
4888 			ahc_dmamem_free(ahc, scb_data->sg_dmat,
4889 					sg_map->sg_vaddr,
4890 					sg_map->sg_dmamap);
4891 			kfree(sg_map);
4892 		}
4893 		ahc_dma_tag_destroy(ahc, scb_data->sg_dmat);
4894 	}
4895 		fallthrough;
4896 	case 6:
4897 		ahc_dmamap_unload(ahc, scb_data->sense_dmat,
4898 				  scb_data->sense_dmamap);
4899 		fallthrough;
4900 	case 5:
4901 		ahc_dmamem_free(ahc, scb_data->sense_dmat, scb_data->sense,
4902 				scb_data->sense_dmamap);
4903 		ahc_dmamap_destroy(ahc, scb_data->sense_dmat,
4904 				   scb_data->sense_dmamap);
4905 		fallthrough;
4906 	case 4:
4907 		ahc_dma_tag_destroy(ahc, scb_data->sense_dmat);
4908 		fallthrough;
4909 	case 3:
4910 		ahc_dmamap_unload(ahc, scb_data->hscb_dmat,
4911 				  scb_data->hscb_dmamap);
4912 		fallthrough;
4913 	case 2:
4914 		ahc_dmamem_free(ahc, scb_data->hscb_dmat, scb_data->hscbs,
4915 				scb_data->hscb_dmamap);
4916 		ahc_dmamap_destroy(ahc, scb_data->hscb_dmat,
4917 				   scb_data->hscb_dmamap);
4918 		fallthrough;
4919 	case 1:
4920 		ahc_dma_tag_destroy(ahc, scb_data->hscb_dmat);
4921 		break;
4922 	case 0:
4923 		break;
4924 	}
4925 	kfree(scb_data->scbarray);
4926 }
4927 
4928 static void
4929 ahc_alloc_scbs(struct ahc_softc *ahc)
4930 {
4931 	struct scb_data *scb_data;
4932 	struct scb *next_scb;
4933 	struct sg_map_node *sg_map;
4934 	dma_addr_t physaddr;
4935 	struct ahc_dma_seg *segs;
4936 	int newcount;
4937 	int i;
4938 
4939 	scb_data = ahc->scb_data;
4940 	if (scb_data->numscbs >= AHC_SCB_MAX_ALLOC)
4941 		/* Can't allocate any more */
4942 		return;
4943 
4944 	next_scb = &scb_data->scbarray[scb_data->numscbs];
4945 
4946 	sg_map = kmalloc(sizeof(*sg_map), GFP_ATOMIC);
4947 
4948 	if (sg_map == NULL)
4949 		return;
4950 
4951 	/* Allocate S/G space for the next batch of SCBS */
4952 	if (ahc_dmamem_alloc(ahc, scb_data->sg_dmat,
4953 			     (void **)&sg_map->sg_vaddr,
4954 			     BUS_DMA_NOWAIT, &sg_map->sg_dmamap) != 0) {
4955 		kfree(sg_map);
4956 		return;
4957 	}
4958 
4959 	SLIST_INSERT_HEAD(&scb_data->sg_maps, sg_map, links);
4960 
4961 	ahc_dmamap_load(ahc, scb_data->sg_dmat, sg_map->sg_dmamap,
4962 			sg_map->sg_vaddr, PAGE_SIZE, ahc_dmamap_cb,
4963 			&sg_map->sg_physaddr, /*flags*/0);
4964 
4965 	segs = sg_map->sg_vaddr;
4966 	physaddr = sg_map->sg_physaddr;
4967 
4968 	newcount = (PAGE_SIZE / (AHC_NSEG * sizeof(struct ahc_dma_seg)));
4969 	newcount = min(newcount, (AHC_SCB_MAX_ALLOC - scb_data->numscbs));
4970 	for (i = 0; i < newcount; i++) {
4971 		struct scb_platform_data *pdata;
4972 
4973 		pdata = kmalloc(sizeof(*pdata), GFP_ATOMIC);
4974 		if (pdata == NULL)
4975 			break;
4976 		next_scb->platform_data = pdata;
4977 		next_scb->sg_map = sg_map;
4978 		next_scb->sg_list = segs;
4979 		/*
4980 		 * The sequencer always starts with the second entry.
4981 		 * The first entry is embedded in the scb.
4982 		 */
4983 		next_scb->sg_list_phys = physaddr + sizeof(struct ahc_dma_seg);
4984 		next_scb->ahc_softc = ahc;
4985 		next_scb->flags = SCB_FREE;
4986 		next_scb->hscb = &scb_data->hscbs[scb_data->numscbs];
4987 		next_scb->hscb->tag = ahc->scb_data->numscbs;
4988 		SLIST_INSERT_HEAD(&ahc->scb_data->free_scbs,
4989 				  next_scb, links.sle);
4990 		segs += AHC_NSEG;
4991 		physaddr += (AHC_NSEG * sizeof(struct ahc_dma_seg));
4992 		next_scb++;
4993 		ahc->scb_data->numscbs++;
4994 	}
4995 }
4996 
4997 void
4998 ahc_controller_info(struct ahc_softc *ahc, char *buf)
4999 {
5000 	int len;
5001 
5002 	len = sprintf(buf, "%s: ", ahc_chip_names[ahc->chip & AHC_CHIPID_MASK]);
5003 	buf += len;
5004 	if ((ahc->features & AHC_TWIN) != 0)
5005 		len = sprintf(buf, "Twin Channel, A SCSI Id=%d, "
5006 			      "B SCSI Id=%d, primary %c, ",
5007 			      ahc->our_id, ahc->our_id_b,
5008 			      (ahc->flags & AHC_PRIMARY_CHANNEL) + 'A');
5009 	else {
5010 		const char *speed;
5011 		const char *type;
5012 
5013 		speed = "";
5014 		if ((ahc->features & AHC_ULTRA) != 0) {
5015 			speed = "Ultra ";
5016 		} else if ((ahc->features & AHC_DT) != 0) {
5017 			speed = "Ultra160 ";
5018 		} else if ((ahc->features & AHC_ULTRA2) != 0) {
5019 			speed = "Ultra2 ";
5020 		}
5021 		if ((ahc->features & AHC_WIDE) != 0) {
5022 			type = "Wide";
5023 		} else {
5024 			type = "Single";
5025 		}
5026 		len = sprintf(buf, "%s%s Channel %c, SCSI Id=%d, ",
5027 			      speed, type, ahc->channel, ahc->our_id);
5028 	}
5029 	buf += len;
5030 
5031 	if ((ahc->flags & AHC_PAGESCBS) != 0)
5032 		sprintf(buf, "%d/%d SCBs",
5033 			ahc->scb_data->maxhscbs, AHC_MAX_QUEUE);
5034 	else
5035 		sprintf(buf, "%d SCBs", ahc->scb_data->maxhscbs);
5036 }
5037 
5038 int
5039 ahc_chip_init(struct ahc_softc *ahc)
5040 {
5041 	int	 term;
5042 	int	 error;
5043 	u_int	 i;
5044 	u_int	 scsi_conf;
5045 	u_int	 scsiseq_template;
5046 	uint32_t physaddr;
5047 
5048 	ahc_outb(ahc, SEQ_FLAGS, 0);
5049 	ahc_outb(ahc, SEQ_FLAGS2, 0);
5050 
5051 	/* Set the SCSI Id, SXFRCTL0, SXFRCTL1, and SIMODE1, for both channels*/
5052 	if (ahc->features & AHC_TWIN) {
5053 
5054 		/*
5055 		 * Setup Channel B first.
5056 		 */
5057 		ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) | SELBUSB);
5058 		term = (ahc->flags & AHC_TERM_ENB_B) != 0 ? STPWEN : 0;
5059 		ahc_outb(ahc, SCSIID, ahc->our_id_b);
5060 		scsi_conf = ahc_inb(ahc, SCSICONF + 1);
5061 		ahc_outb(ahc, SXFRCTL1, (scsi_conf & (ENSPCHK|STIMESEL))
5062 					|term|ahc->seltime_b|ENSTIMER|ACTNEGEN);
5063 		if ((ahc->features & AHC_ULTRA2) != 0)
5064 			ahc_outb(ahc, SIMODE0, ahc_inb(ahc, SIMODE0)|ENIOERR);
5065 		ahc_outb(ahc, SIMODE1, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
5066 		ahc_outb(ahc, SXFRCTL0, DFON|SPIOEN);
5067 
5068 		/* Select Channel A */
5069 		ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) & ~SELBUSB);
5070 	}
5071 	term = (ahc->flags & AHC_TERM_ENB_A) != 0 ? STPWEN : 0;
5072 	if ((ahc->features & AHC_ULTRA2) != 0)
5073 		ahc_outb(ahc, SCSIID_ULTRA2, ahc->our_id);
5074 	else
5075 		ahc_outb(ahc, SCSIID, ahc->our_id);
5076 	scsi_conf = ahc_inb(ahc, SCSICONF);
5077 	ahc_outb(ahc, SXFRCTL1, (scsi_conf & (ENSPCHK|STIMESEL))
5078 				|term|ahc->seltime
5079 				|ENSTIMER|ACTNEGEN);
5080 	if ((ahc->features & AHC_ULTRA2) != 0)
5081 		ahc_outb(ahc, SIMODE0, ahc_inb(ahc, SIMODE0)|ENIOERR);
5082 	ahc_outb(ahc, SIMODE1, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
5083 	ahc_outb(ahc, SXFRCTL0, DFON|SPIOEN);
5084 
5085 	/* There are no untagged SCBs active yet. */
5086 	for (i = 0; i < 16; i++) {
5087 		ahc_unbusy_tcl(ahc, BUILD_TCL(i << 4, 0));
5088 		if ((ahc->flags & AHC_SCB_BTT) != 0) {
5089 			int lun;
5090 
5091 			/*
5092 			 * The SCB based BTT allows an entry per
5093 			 * target and lun pair.
5094 			 */
5095 			for (lun = 1; lun < AHC_NUM_LUNS; lun++)
5096 				ahc_unbusy_tcl(ahc, BUILD_TCL(i << 4, lun));
5097 		}
5098 	}
5099 
5100 	/* All of our queues are empty */
5101 	for (i = 0; i < 256; i++)
5102 		ahc->qoutfifo[i] = SCB_LIST_NULL;
5103 	ahc_sync_qoutfifo(ahc, BUS_DMASYNC_PREREAD);
5104 
5105 	for (i = 0; i < 256; i++)
5106 		ahc->qinfifo[i] = SCB_LIST_NULL;
5107 
5108 	if ((ahc->features & AHC_MULTI_TID) != 0) {
5109 		ahc_outb(ahc, TARGID, 0);
5110 		ahc_outb(ahc, TARGID + 1, 0);
5111 	}
5112 
5113 	/*
5114 	 * Tell the sequencer where it can find our arrays in memory.
5115 	 */
5116 	physaddr = ahc->scb_data->hscb_busaddr;
5117 	ahc_outb(ahc, HSCB_ADDR, physaddr & 0xFF);
5118 	ahc_outb(ahc, HSCB_ADDR + 1, (physaddr >> 8) & 0xFF);
5119 	ahc_outb(ahc, HSCB_ADDR + 2, (physaddr >> 16) & 0xFF);
5120 	ahc_outb(ahc, HSCB_ADDR + 3, (physaddr >> 24) & 0xFF);
5121 
5122 	physaddr = ahc->shared_data_busaddr;
5123 	ahc_outb(ahc, SHARED_DATA_ADDR, physaddr & 0xFF);
5124 	ahc_outb(ahc, SHARED_DATA_ADDR + 1, (physaddr >> 8) & 0xFF);
5125 	ahc_outb(ahc, SHARED_DATA_ADDR + 2, (physaddr >> 16) & 0xFF);
5126 	ahc_outb(ahc, SHARED_DATA_ADDR + 3, (physaddr >> 24) & 0xFF);
5127 
5128 	/*
5129 	 * Initialize the group code to command length table.
5130 	 * This overrides the values in TARG_SCSIRATE, so only
5131 	 * setup the table after we have processed that information.
5132 	 */
5133 	ahc_outb(ahc, CMDSIZE_TABLE, 5);
5134 	ahc_outb(ahc, CMDSIZE_TABLE + 1, 9);
5135 	ahc_outb(ahc, CMDSIZE_TABLE + 2, 9);
5136 	ahc_outb(ahc, CMDSIZE_TABLE + 3, 0);
5137 	ahc_outb(ahc, CMDSIZE_TABLE + 4, 15);
5138 	ahc_outb(ahc, CMDSIZE_TABLE + 5, 11);
5139 	ahc_outb(ahc, CMDSIZE_TABLE + 6, 0);
5140 	ahc_outb(ahc, CMDSIZE_TABLE + 7, 0);
5141 
5142 	if ((ahc->features & AHC_HS_MAILBOX) != 0)
5143 		ahc_outb(ahc, HS_MAILBOX, 0);
5144 
5145 	/* Tell the sequencer of our initial queue positions */
5146 	if ((ahc->features & AHC_TARGETMODE) != 0) {
5147 		ahc->tqinfifonext = 1;
5148 		ahc_outb(ahc, KERNEL_TQINPOS, ahc->tqinfifonext - 1);
5149 		ahc_outb(ahc, TQINPOS, ahc->tqinfifonext);
5150 	}
5151 	ahc->qinfifonext = 0;
5152 	ahc->qoutfifonext = 0;
5153 	if ((ahc->features & AHC_QUEUE_REGS) != 0) {
5154 		ahc_outb(ahc, QOFF_CTLSTA, SCB_QSIZE_256);
5155 		ahc_outb(ahc, HNSCB_QOFF, ahc->qinfifonext);
5156 		ahc_outb(ahc, SNSCB_QOFF, ahc->qinfifonext);
5157 		ahc_outb(ahc, SDSCB_QOFF, 0);
5158 	} else {
5159 		ahc_outb(ahc, KERNEL_QINPOS, ahc->qinfifonext);
5160 		ahc_outb(ahc, QINPOS, ahc->qinfifonext);
5161 		ahc_outb(ahc, QOUTPOS, ahc->qoutfifonext);
5162 	}
5163 
5164 	/* We don't have any waiting selections */
5165 	ahc_outb(ahc, WAITING_SCBH, SCB_LIST_NULL);
5166 
5167 	/* Our disconnection list is empty too */
5168 	ahc_outb(ahc, DISCONNECTED_SCBH, SCB_LIST_NULL);
5169 
5170 	/* Message out buffer starts empty */
5171 	ahc_outb(ahc, MSG_OUT, NOP);
5172 
5173 	/*
5174 	 * Setup the allowed SCSI Sequences based on operational mode.
5175 	 * If we are a target, we'll enable select in operations once
5176 	 * we've had a lun enabled.
5177 	 */
5178 	scsiseq_template = ENSELO|ENAUTOATNO|ENAUTOATNP;
5179 	if ((ahc->flags & AHC_INITIATORROLE) != 0)
5180 		scsiseq_template |= ENRSELI;
5181 	ahc_outb(ahc, SCSISEQ_TEMPLATE, scsiseq_template);
5182 
5183 	/* Initialize our list of free SCBs. */
5184 	ahc_build_free_scb_list(ahc);
5185 
5186 	/*
5187 	 * Tell the sequencer which SCB will be the next one it receives.
5188 	 */
5189 	ahc_outb(ahc, NEXT_QUEUED_SCB, ahc->next_queued_scb->hscb->tag);
5190 
5191 	/*
5192 	 * Load the Sequencer program and Enable the adapter
5193 	 * in "fast" mode.
5194 	 */
5195 	if (bootverbose)
5196 		printk("%s: Downloading Sequencer Program...",
5197 		       ahc_name(ahc));
5198 
5199 	error = ahc_loadseq(ahc);
5200 	if (error != 0)
5201 		return (error);
5202 
5203 	if ((ahc->features & AHC_ULTRA2) != 0) {
5204 		int wait;
5205 
5206 		/*
5207 		 * Wait for up to 500ms for our transceivers
5208 		 * to settle.  If the adapter does not have
5209 		 * a cable attached, the transceivers may
5210 		 * never settle, so don't complain if we
5211 		 * fail here.
5212 		 */
5213 		for (wait = 5000;
5214 		     (ahc_inb(ahc, SBLKCTL) & (ENAB40|ENAB20)) == 0 && wait;
5215 		     wait--)
5216 			ahc_delay(100);
5217 	}
5218 	ahc_restart(ahc);
5219 	return (0);
5220 }
5221 
5222 /*
5223  * Start the board, ready for normal operation
5224  */
5225 int
5226 ahc_init(struct ahc_softc *ahc)
5227 {
5228 	int	 max_targ;
5229 	u_int	 i;
5230 	u_int	 scsi_conf;
5231 	u_int	 ultraenb;
5232 	u_int	 discenable;
5233 	u_int	 tagenable;
5234 	size_t	 driver_data_size;
5235 
5236 #ifdef AHC_DEBUG
5237 	if ((ahc_debug & AHC_DEBUG_SEQUENCER) != 0)
5238 		ahc->flags |= AHC_SEQUENCER_DEBUG;
5239 #endif
5240 
5241 #ifdef AHC_PRINT_SRAM
5242 	printk("Scratch Ram:");
5243 	for (i = 0x20; i < 0x5f; i++) {
5244 		if (((i % 8) == 0) && (i != 0)) {
5245 			printk ("\n              ");
5246 		}
5247 		printk (" 0x%x", ahc_inb(ahc, i));
5248 	}
5249 	if ((ahc->features & AHC_MORE_SRAM) != 0) {
5250 		for (i = 0x70; i < 0x7f; i++) {
5251 			if (((i % 8) == 0) && (i != 0)) {
5252 				printk ("\n              ");
5253 			}
5254 			printk (" 0x%x", ahc_inb(ahc, i));
5255 		}
5256 	}
5257 	printk ("\n");
5258 	/*
5259 	 * Reading uninitialized scratch ram may
5260 	 * generate parity errors.
5261 	 */
5262 	ahc_outb(ahc, CLRINT, CLRPARERR);
5263 	ahc_outb(ahc, CLRINT, CLRBRKADRINT);
5264 #endif
5265 	max_targ = 15;
5266 
5267 	/*
5268 	 * Assume we have a board at this stage and it has been reset.
5269 	 */
5270 	if ((ahc->flags & AHC_USEDEFAULTS) != 0)
5271 		ahc->our_id = ahc->our_id_b = 7;
5272 
5273 	/*
5274 	 * Default to allowing initiator operations.
5275 	 */
5276 	ahc->flags |= AHC_INITIATORROLE;
5277 
5278 	/*
5279 	 * Only allow target mode features if this unit has them enabled.
5280 	 */
5281 	if ((AHC_TMODE_ENABLE & (0x1 << ahc->unit)) == 0)
5282 		ahc->features &= ~AHC_TARGETMODE;
5283 
5284 	ahc->init_level++;
5285 
5286 	/*
5287 	 * DMA tag for our command fifos and other data in system memory
5288 	 * the card's sequencer must be able to access.  For initiator
5289 	 * roles, we need to allocate space for the qinfifo and qoutfifo.
5290 	 * The qinfifo and qoutfifo are composed of 256 1 byte elements.
5291 	 * When providing for the target mode role, we must additionally
5292 	 * provide space for the incoming target command fifo and an extra
5293 	 * byte to deal with a dma bug in some chip versions.
5294 	 */
5295 	driver_data_size = 2 * 256 * sizeof(uint8_t);
5296 	if ((ahc->features & AHC_TARGETMODE) != 0)
5297 		driver_data_size += AHC_TMODE_CMDS * sizeof(struct target_cmd)
5298 				 + /*DMA WideOdd Bug Buffer*/1;
5299 	if (ahc_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/1,
5300 			       /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
5301 			       /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
5302 			       /*highaddr*/BUS_SPACE_MAXADDR,
5303 			       /*filter*/NULL, /*filterarg*/NULL,
5304 			       driver_data_size,
5305 			       /*nsegments*/1,
5306 			       /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
5307 			       /*flags*/0, &ahc->shared_data_dmat) != 0) {
5308 		return (ENOMEM);
5309 	}
5310 
5311 	ahc->init_level++;
5312 
5313 	/* Allocation of driver data */
5314 	if (ahc_dmamem_alloc(ahc, ahc->shared_data_dmat,
5315 			     (void **)&ahc->qoutfifo,
5316 			     BUS_DMA_NOWAIT, &ahc->shared_data_dmamap) != 0) {
5317 		return (ENOMEM);
5318 	}
5319 
5320 	ahc->init_level++;
5321 
5322 	/* And permanently map it in */
5323 	ahc_dmamap_load(ahc, ahc->shared_data_dmat, ahc->shared_data_dmamap,
5324 			ahc->qoutfifo, driver_data_size, ahc_dmamap_cb,
5325 			&ahc->shared_data_busaddr, /*flags*/0);
5326 
5327 	if ((ahc->features & AHC_TARGETMODE) != 0) {
5328 		ahc->targetcmds = (struct target_cmd *)ahc->qoutfifo;
5329 		ahc->qoutfifo = (uint8_t *)&ahc->targetcmds[AHC_TMODE_CMDS];
5330 		ahc->dma_bug_buf = ahc->shared_data_busaddr
5331 				 + driver_data_size - 1;
5332 		/* All target command blocks start out invalid. */
5333 		for (i = 0; i < AHC_TMODE_CMDS; i++)
5334 			ahc->targetcmds[i].cmd_valid = 0;
5335 		ahc_sync_tqinfifo(ahc, BUS_DMASYNC_PREREAD);
5336 		ahc->qoutfifo = (uint8_t *)&ahc->targetcmds[256];
5337 	}
5338 	ahc->qinfifo = &ahc->qoutfifo[256];
5339 
5340 	ahc->init_level++;
5341 
5342 	/* Allocate SCB data now that buffer_dmat is initialized */
5343 	if (ahc->scb_data->maxhscbs == 0)
5344 		if (ahc_init_scbdata(ahc) != 0)
5345 			return (ENOMEM);
5346 
5347 	/*
5348 	 * Allocate a tstate to house information for our
5349 	 * initiator presence on the bus as well as the user
5350 	 * data for any target mode initiator.
5351 	 */
5352 	if (ahc_alloc_tstate(ahc, ahc->our_id, 'A') == NULL) {
5353 		printk("%s: unable to allocate ahc_tmode_tstate.  "
5354 		       "Failing attach\n", ahc_name(ahc));
5355 		return (ENOMEM);
5356 	}
5357 
5358 	if ((ahc->features & AHC_TWIN) != 0) {
5359 		if (ahc_alloc_tstate(ahc, ahc->our_id_b, 'B') == NULL) {
5360 			printk("%s: unable to allocate ahc_tmode_tstate.  "
5361 			       "Failing attach\n", ahc_name(ahc));
5362 			return (ENOMEM);
5363 		}
5364 	}
5365 
5366 	if (ahc->scb_data->maxhscbs < AHC_SCB_MAX_ALLOC) {
5367 		ahc->flags |= AHC_PAGESCBS;
5368 	} else {
5369 		ahc->flags &= ~AHC_PAGESCBS;
5370 	}
5371 
5372 #ifdef AHC_DEBUG
5373 	if (ahc_debug & AHC_SHOW_MISC) {
5374 		printk("%s: hardware scb %u bytes; kernel scb %u bytes; "
5375 		       "ahc_dma %u bytes\n",
5376 			ahc_name(ahc),
5377 			(u_int)sizeof(struct hardware_scb),
5378 			(u_int)sizeof(struct scb),
5379 			(u_int)sizeof(struct ahc_dma_seg));
5380 	}
5381 #endif /* AHC_DEBUG */
5382 
5383 	/*
5384 	 * Look at the information that board initialization or
5385 	 * the board bios has left us.
5386 	 */
5387 	if (ahc->features & AHC_TWIN) {
5388 		scsi_conf = ahc_inb(ahc, SCSICONF + 1);
5389 		if ((scsi_conf & RESET_SCSI) != 0
5390 		 && (ahc->flags & AHC_INITIATORROLE) != 0)
5391 			ahc->flags |= AHC_RESET_BUS_B;
5392 	}
5393 
5394 	scsi_conf = ahc_inb(ahc, SCSICONF);
5395 	if ((scsi_conf & RESET_SCSI) != 0
5396 	 && (ahc->flags & AHC_INITIATORROLE) != 0)
5397 		ahc->flags |= AHC_RESET_BUS_A;
5398 
5399 	ultraenb = 0;
5400 	tagenable = ALL_TARGETS_MASK;
5401 
5402 	/* Grab the disconnection disable table and invert it for our needs */
5403 	if ((ahc->flags & AHC_USEDEFAULTS) != 0) {
5404 		printk("%s: Host Adapter Bios disabled.  Using default SCSI "
5405 			"device parameters\n", ahc_name(ahc));
5406 		ahc->flags |= AHC_EXTENDED_TRANS_A|AHC_EXTENDED_TRANS_B|
5407 			      AHC_TERM_ENB_A|AHC_TERM_ENB_B;
5408 		discenable = ALL_TARGETS_MASK;
5409 		if ((ahc->features & AHC_ULTRA) != 0)
5410 			ultraenb = ALL_TARGETS_MASK;
5411 	} else {
5412 		discenable = ~((ahc_inb(ahc, DISC_DSB + 1) << 8)
5413 			   | ahc_inb(ahc, DISC_DSB));
5414 		if ((ahc->features & (AHC_ULTRA|AHC_ULTRA2)) != 0)
5415 			ultraenb = (ahc_inb(ahc, ULTRA_ENB + 1) << 8)
5416 				      | ahc_inb(ahc, ULTRA_ENB);
5417 	}
5418 
5419 	if ((ahc->features & (AHC_WIDE|AHC_TWIN)) == 0)
5420 		max_targ = 7;
5421 
5422 	for (i = 0; i <= max_targ; i++) {
5423 		struct ahc_initiator_tinfo *tinfo;
5424 		struct ahc_tmode_tstate *tstate;
5425 		u_int our_id;
5426 		u_int target_id;
5427 		char channel;
5428 
5429 		channel = 'A';
5430 		our_id = ahc->our_id;
5431 		target_id = i;
5432 		if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
5433 			channel = 'B';
5434 			our_id = ahc->our_id_b;
5435 			target_id = i % 8;
5436 		}
5437 		tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
5438 					    target_id, &tstate);
5439 		/* Default to async narrow across the board */
5440 		memset(tinfo, 0, sizeof(*tinfo));
5441 		if (ahc->flags & AHC_USEDEFAULTS) {
5442 			if ((ahc->features & AHC_WIDE) != 0)
5443 				tinfo->user.width = MSG_EXT_WDTR_BUS_16_BIT;
5444 
5445 			/*
5446 			 * These will be truncated when we determine the
5447 			 * connection type we have with the target.
5448 			 */
5449 			tinfo->user.period = ahc_syncrates->period;
5450 			tinfo->user.offset = MAX_OFFSET;
5451 		} else {
5452 			u_int scsirate;
5453 			uint16_t mask;
5454 
5455 			/* Take the settings leftover in scratch RAM. */
5456 			scsirate = ahc_inb(ahc, TARG_SCSIRATE + i);
5457 			mask = (0x01 << i);
5458 			if ((ahc->features & AHC_ULTRA2) != 0) {
5459 				u_int offset;
5460 				u_int maxsync;
5461 
5462 				if ((scsirate & SOFS) == 0x0F) {
5463 					/*
5464 					 * Haven't negotiated yet,
5465 					 * so the format is different.
5466 					 */
5467 					scsirate = (scsirate & SXFR) >> 4
5468 						 | (ultraenb & mask)
5469 						  ? 0x08 : 0x0
5470 						 | (scsirate & WIDEXFER);
5471 					offset = MAX_OFFSET_ULTRA2;
5472 				} else
5473 					offset = ahc_inb(ahc, TARG_OFFSET + i);
5474 				if ((scsirate & ~WIDEXFER) == 0 && offset != 0)
5475 					/* Set to the lowest sync rate, 5MHz */
5476 					scsirate |= 0x1c;
5477 				maxsync = AHC_SYNCRATE_ULTRA2;
5478 				if ((ahc->features & AHC_DT) != 0)
5479 					maxsync = AHC_SYNCRATE_DT;
5480 				tinfo->user.period =
5481 				    ahc_find_period(ahc, scsirate, maxsync);
5482 				if (offset == 0)
5483 					tinfo->user.period = 0;
5484 				else
5485 					tinfo->user.offset = MAX_OFFSET;
5486 				if ((scsirate & SXFR_ULTRA2) <= 8/*10MHz*/
5487 				 && (ahc->features & AHC_DT) != 0)
5488 					tinfo->user.ppr_options =
5489 					    MSG_EXT_PPR_DT_REQ;
5490 			} else if ((scsirate & SOFS) != 0) {
5491 				if ((scsirate & SXFR) == 0x40
5492 				 && (ultraenb & mask) != 0) {
5493 					/* Treat 10MHz as a non-ultra speed */
5494 					scsirate &= ~SXFR;
5495 					ultraenb &= ~mask;
5496 				}
5497 				tinfo->user.period =
5498 				    ahc_find_period(ahc, scsirate,
5499 						    (ultraenb & mask)
5500 						   ? AHC_SYNCRATE_ULTRA
5501 						   : AHC_SYNCRATE_FAST);
5502 				if (tinfo->user.period != 0)
5503 					tinfo->user.offset = MAX_OFFSET;
5504 			}
5505 			if (tinfo->user.period == 0)
5506 				tinfo->user.offset = 0;
5507 			if ((scsirate & WIDEXFER) != 0
5508 			 && (ahc->features & AHC_WIDE) != 0)
5509 				tinfo->user.width = MSG_EXT_WDTR_BUS_16_BIT;
5510 			tinfo->user.protocol_version = 4;
5511 			if ((ahc->features & AHC_DT) != 0)
5512 				tinfo->user.transport_version = 3;
5513 			else
5514 				tinfo->user.transport_version = 2;
5515 			tinfo->goal.protocol_version = 2;
5516 			tinfo->goal.transport_version = 2;
5517 			tinfo->curr.protocol_version = 2;
5518 			tinfo->curr.transport_version = 2;
5519 		}
5520 		tstate->ultraenb = 0;
5521 	}
5522 	ahc->user_discenable = discenable;
5523 	ahc->user_tagenable = tagenable;
5524 
5525 	return (ahc->bus_chip_init(ahc));
5526 }
5527 
5528 void
5529 ahc_intr_enable(struct ahc_softc *ahc, int enable)
5530 {
5531 	u_int hcntrl;
5532 
5533 	hcntrl = ahc_inb(ahc, HCNTRL);
5534 	hcntrl &= ~INTEN;
5535 	ahc->pause &= ~INTEN;
5536 	ahc->unpause &= ~INTEN;
5537 	if (enable) {
5538 		hcntrl |= INTEN;
5539 		ahc->pause |= INTEN;
5540 		ahc->unpause |= INTEN;
5541 	}
5542 	ahc_outb(ahc, HCNTRL, hcntrl);
5543 }
5544 
5545 /*
5546  * Ensure that the card is paused in a location
5547  * outside of all critical sections and that all
5548  * pending work is completed prior to returning.
5549  * This routine should only be called from outside
5550  * an interrupt context.
5551  */
5552 void
5553 ahc_pause_and_flushwork(struct ahc_softc *ahc)
5554 {
5555 	int intstat;
5556 	int maxloops;
5557 	int paused;
5558 
5559 	maxloops = 1000;
5560 	ahc->flags |= AHC_ALL_INTERRUPTS;
5561 	paused = FALSE;
5562 	do {
5563 		if (paused) {
5564 			ahc_unpause(ahc);
5565 			/*
5566 			 * Give the sequencer some time to service
5567 			 * any active selections.
5568 			 */
5569 			ahc_delay(500);
5570 		}
5571 		ahc_intr(ahc);
5572 		ahc_pause(ahc);
5573 		paused = TRUE;
5574 		ahc_outb(ahc, SCSISEQ, ahc_inb(ahc, SCSISEQ) & ~ENSELO);
5575 		intstat = ahc_inb(ahc, INTSTAT);
5576 		if ((intstat & INT_PEND) == 0) {
5577 			ahc_clear_critical_section(ahc);
5578 			intstat = ahc_inb(ahc, INTSTAT);
5579 		}
5580 	} while (--maxloops
5581 	      && (intstat != 0xFF || (ahc->features & AHC_REMOVABLE) == 0)
5582 	      && ((intstat & INT_PEND) != 0
5583 	       || (ahc_inb(ahc, SSTAT0) & (SELDO|SELINGO)) != 0));
5584 	if (maxloops == 0) {
5585 		printk("Infinite interrupt loop, INTSTAT = %x",
5586 		       ahc_inb(ahc, INTSTAT));
5587 	}
5588 	ahc_platform_flushwork(ahc);
5589 	ahc->flags &= ~AHC_ALL_INTERRUPTS;
5590 }
5591 
5592 int __maybe_unused
5593 ahc_suspend(struct ahc_softc *ahc)
5594 {
5595 
5596 	ahc_pause_and_flushwork(ahc);
5597 
5598 	if (LIST_FIRST(&ahc->pending_scbs) != NULL) {
5599 		ahc_unpause(ahc);
5600 		return (EBUSY);
5601 	}
5602 
5603 #ifdef AHC_TARGET_MODE
5604 	/*
5605 	 * XXX What about ATIOs that have not yet been serviced?
5606 	 * Perhaps we should just refuse to be suspended if we
5607 	 * are acting in a target role.
5608 	 */
5609 	if (ahc->pending_device != NULL) {
5610 		ahc_unpause(ahc);
5611 		return (EBUSY);
5612 	}
5613 #endif
5614 	ahc_shutdown(ahc);
5615 	return (0);
5616 }
5617 
5618 int __maybe_unused
5619 ahc_resume(struct ahc_softc *ahc)
5620 {
5621 
5622 	ahc_reset(ahc, /*reinit*/TRUE);
5623 	ahc_intr_enable(ahc, TRUE);
5624 	ahc_restart(ahc);
5625 	return (0);
5626 }
5627 /************************** Busy Target Table *********************************/
5628 /*
5629  * Return the untagged transaction id for a given target/channel lun.
5630  * Optionally, clear the entry.
5631  */
5632 static u_int
5633 ahc_index_busy_tcl(struct ahc_softc *ahc, u_int tcl)
5634 {
5635 	u_int scbid;
5636 	u_int target_offset;
5637 
5638 	if ((ahc->flags & AHC_SCB_BTT) != 0) {
5639 		u_int saved_scbptr;
5640 
5641 		saved_scbptr = ahc_inb(ahc, SCBPTR);
5642 		ahc_outb(ahc, SCBPTR, TCL_LUN(tcl));
5643 		scbid = ahc_inb(ahc, SCB_64_BTT + TCL_TARGET_OFFSET(tcl));
5644 		ahc_outb(ahc, SCBPTR, saved_scbptr);
5645 	} else {
5646 		target_offset = TCL_TARGET_OFFSET(tcl);
5647 		scbid = ahc_inb(ahc, BUSY_TARGETS + target_offset);
5648 	}
5649 
5650 	return (scbid);
5651 }
5652 
5653 static void
5654 ahc_unbusy_tcl(struct ahc_softc *ahc, u_int tcl)
5655 {
5656 	u_int target_offset;
5657 
5658 	if ((ahc->flags & AHC_SCB_BTT) != 0) {
5659 		u_int saved_scbptr;
5660 
5661 		saved_scbptr = ahc_inb(ahc, SCBPTR);
5662 		ahc_outb(ahc, SCBPTR, TCL_LUN(tcl));
5663 		ahc_outb(ahc, SCB_64_BTT+TCL_TARGET_OFFSET(tcl), SCB_LIST_NULL);
5664 		ahc_outb(ahc, SCBPTR, saved_scbptr);
5665 	} else {
5666 		target_offset = TCL_TARGET_OFFSET(tcl);
5667 		ahc_outb(ahc, BUSY_TARGETS + target_offset, SCB_LIST_NULL);
5668 	}
5669 }
5670 
5671 static void
5672 ahc_busy_tcl(struct ahc_softc *ahc, u_int tcl, u_int scbid)
5673 {
5674 	u_int target_offset;
5675 
5676 	if ((ahc->flags & AHC_SCB_BTT) != 0) {
5677 		u_int saved_scbptr;
5678 
5679 		saved_scbptr = ahc_inb(ahc, SCBPTR);
5680 		ahc_outb(ahc, SCBPTR, TCL_LUN(tcl));
5681 		ahc_outb(ahc, SCB_64_BTT + TCL_TARGET_OFFSET(tcl), scbid);
5682 		ahc_outb(ahc, SCBPTR, saved_scbptr);
5683 	} else {
5684 		target_offset = TCL_TARGET_OFFSET(tcl);
5685 		ahc_outb(ahc, BUSY_TARGETS + target_offset, scbid);
5686 	}
5687 }
5688 
5689 /************************** SCB and SCB queue management **********************/
5690 int
5691 ahc_match_scb(struct ahc_softc *ahc, struct scb *scb, int target,
5692 	      char channel, int lun, u_int tag, role_t role)
5693 {
5694 	int targ = SCB_GET_TARGET(ahc, scb);
5695 	char chan = SCB_GET_CHANNEL(ahc, scb);
5696 	int slun = SCB_GET_LUN(scb);
5697 	int match;
5698 
5699 	match = ((chan == channel) || (channel == ALL_CHANNELS));
5700 	if (match != 0)
5701 		match = ((targ == target) || (target == CAM_TARGET_WILDCARD));
5702 	if (match != 0)
5703 		match = ((lun == slun) || (lun == CAM_LUN_WILDCARD));
5704 	if (match != 0) {
5705 #ifdef AHC_TARGET_MODE
5706 		int group;
5707 
5708 		group = XPT_FC_GROUP(scb->io_ctx->ccb_h.func_code);
5709 		if (role == ROLE_INITIATOR) {
5710 			match = (group != XPT_FC_GROUP_TMODE)
5711 			      && ((tag == scb->hscb->tag)
5712 			       || (tag == SCB_LIST_NULL));
5713 		} else if (role == ROLE_TARGET) {
5714 			match = (group == XPT_FC_GROUP_TMODE)
5715 			      && ((tag == scb->io_ctx->csio.tag_id)
5716 			       || (tag == SCB_LIST_NULL));
5717 		}
5718 #else /* !AHC_TARGET_MODE */
5719 		match = ((tag == scb->hscb->tag) || (tag == SCB_LIST_NULL));
5720 #endif /* AHC_TARGET_MODE */
5721 	}
5722 
5723 	return match;
5724 }
5725 
5726 static void
5727 ahc_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
5728 {
5729 	int	target;
5730 	char	channel;
5731 	int	lun;
5732 
5733 	target = SCB_GET_TARGET(ahc, scb);
5734 	lun = SCB_GET_LUN(scb);
5735 	channel = SCB_GET_CHANNEL(ahc, scb);
5736 
5737 	ahc_search_qinfifo(ahc, target, channel, lun,
5738 			   /*tag*/SCB_LIST_NULL, ROLE_UNKNOWN,
5739 			   CAM_REQUEUE_REQ, SEARCH_COMPLETE);
5740 
5741 	ahc_platform_freeze_devq(ahc, scb);
5742 }
5743 
5744 void
5745 ahc_qinfifo_requeue_tail(struct ahc_softc *ahc, struct scb *scb)
5746 {
5747 	struct scb *prev_scb;
5748 
5749 	prev_scb = NULL;
5750 	if (ahc_qinfifo_count(ahc) != 0) {
5751 		u_int prev_tag;
5752 		uint8_t prev_pos;
5753 
5754 		prev_pos = ahc->qinfifonext - 1;
5755 		prev_tag = ahc->qinfifo[prev_pos];
5756 		prev_scb = ahc_lookup_scb(ahc, prev_tag);
5757 	}
5758 	ahc_qinfifo_requeue(ahc, prev_scb, scb);
5759 	if ((ahc->features & AHC_QUEUE_REGS) != 0) {
5760 		ahc_outb(ahc, HNSCB_QOFF, ahc->qinfifonext);
5761 	} else {
5762 		ahc_outb(ahc, KERNEL_QINPOS, ahc->qinfifonext);
5763 	}
5764 }
5765 
5766 static void
5767 ahc_qinfifo_requeue(struct ahc_softc *ahc, struct scb *prev_scb,
5768 		    struct scb *scb)
5769 {
5770 	if (prev_scb == NULL) {
5771 		ahc_outb(ahc, NEXT_QUEUED_SCB, scb->hscb->tag);
5772 	} else {
5773 		prev_scb->hscb->next = scb->hscb->tag;
5774 		ahc_sync_scb(ahc, prev_scb,
5775 			     BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
5776 	}
5777 	ahc->qinfifo[ahc->qinfifonext++] = scb->hscb->tag;
5778 	scb->hscb->next = ahc->next_queued_scb->hscb->tag;
5779 	ahc_sync_scb(ahc, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
5780 }
5781 
5782 static int
5783 ahc_qinfifo_count(struct ahc_softc *ahc)
5784 {
5785 	uint8_t qinpos;
5786 	uint8_t diff;
5787 
5788 	if ((ahc->features & AHC_QUEUE_REGS) != 0) {
5789 		qinpos = ahc_inb(ahc, SNSCB_QOFF);
5790 		ahc_outb(ahc, SNSCB_QOFF, qinpos);
5791 	} else
5792 		qinpos = ahc_inb(ahc, QINPOS);
5793 	diff = ahc->qinfifonext - qinpos;
5794 	return (diff);
5795 }
5796 
5797 int
5798 ahc_search_qinfifo(struct ahc_softc *ahc, int target, char channel,
5799 		   int lun, u_int tag, role_t role, uint32_t status,
5800 		   ahc_search_action action)
5801 {
5802 	struct	scb *scb;
5803 	struct	scb *prev_scb;
5804 	uint8_t qinstart;
5805 	uint8_t qinpos;
5806 	uint8_t qintail;
5807 	uint8_t next;
5808 	uint8_t prev;
5809 	uint8_t curscbptr;
5810 	int	found;
5811 	int	have_qregs;
5812 
5813 	qintail = ahc->qinfifonext;
5814 	have_qregs = (ahc->features & AHC_QUEUE_REGS) != 0;
5815 	if (have_qregs) {
5816 		qinstart = ahc_inb(ahc, SNSCB_QOFF);
5817 		ahc_outb(ahc, SNSCB_QOFF, qinstart);
5818 	} else
5819 		qinstart = ahc_inb(ahc, QINPOS);
5820 	qinpos = qinstart;
5821 	found = 0;
5822 	prev_scb = NULL;
5823 
5824 	if (action == SEARCH_COMPLETE) {
5825 		/*
5826 		 * Don't attempt to run any queued untagged transactions
5827 		 * until we are done with the abort process.
5828 		 */
5829 		ahc_freeze_untagged_queues(ahc);
5830 	}
5831 
5832 	/*
5833 	 * Start with an empty queue.  Entries that are not chosen
5834 	 * for removal will be re-added to the queue as we go.
5835 	 */
5836 	ahc->qinfifonext = qinpos;
5837 	ahc_outb(ahc, NEXT_QUEUED_SCB, ahc->next_queued_scb->hscb->tag);
5838 
5839 	while (qinpos != qintail) {
5840 		scb = ahc_lookup_scb(ahc, ahc->qinfifo[qinpos]);
5841 		if (scb == NULL) {
5842 			printk("qinpos = %d, SCB index = %d\n",
5843 				qinpos, ahc->qinfifo[qinpos]);
5844 			panic("Loop 1\n");
5845 		}
5846 
5847 		if (ahc_match_scb(ahc, scb, target, channel, lun, tag, role)) {
5848 			/*
5849 			 * We found an scb that needs to be acted on.
5850 			 */
5851 			found++;
5852 			switch (action) {
5853 			case SEARCH_COMPLETE:
5854 			{
5855 				cam_status ostat;
5856 				cam_status cstat;
5857 
5858 				ostat = ahc_get_transaction_status(scb);
5859 				if (ostat == CAM_REQ_INPROG)
5860 					ahc_set_transaction_status(scb, status);
5861 				cstat = ahc_get_transaction_status(scb);
5862 				if (cstat != CAM_REQ_CMP)
5863 					ahc_freeze_scb(scb);
5864 				if ((scb->flags & SCB_ACTIVE) == 0)
5865 					printk("Inactive SCB in qinfifo\n");
5866 				ahc_done(ahc, scb);
5867 			}
5868 				fallthrough;
5869 			case SEARCH_REMOVE:
5870 				break;
5871 			case SEARCH_COUNT:
5872 				ahc_qinfifo_requeue(ahc, prev_scb, scb);
5873 				prev_scb = scb;
5874 				break;
5875 			}
5876 		} else {
5877 			ahc_qinfifo_requeue(ahc, prev_scb, scb);
5878 			prev_scb = scb;
5879 		}
5880 		qinpos++;
5881 	}
5882 
5883 	if ((ahc->features & AHC_QUEUE_REGS) != 0) {
5884 		ahc_outb(ahc, HNSCB_QOFF, ahc->qinfifonext);
5885 	} else {
5886 		ahc_outb(ahc, KERNEL_QINPOS, ahc->qinfifonext);
5887 	}
5888 
5889 	if (action != SEARCH_COUNT
5890 	 && (found != 0)
5891 	 && (qinstart != ahc->qinfifonext)) {
5892 		/*
5893 		 * The sequencer may be in the process of dmaing
5894 		 * down the SCB at the beginning of the queue.
5895 		 * This could be problematic if either the first,
5896 		 * or the second SCB is removed from the queue
5897 		 * (the first SCB includes a pointer to the "next"
5898 		 * SCB to dma). If we have removed any entries, swap
5899 		 * the first element in the queue with the next HSCB
5900 		 * so the sequencer will notice that NEXT_QUEUED_SCB
5901 		 * has changed during its dma attempt and will retry
5902 		 * the DMA.
5903 		 */
5904 		scb = ahc_lookup_scb(ahc, ahc->qinfifo[qinstart]);
5905 
5906 		if (scb == NULL) {
5907 			printk("found = %d, qinstart = %d, qinfifionext = %d\n",
5908 				found, qinstart, ahc->qinfifonext);
5909 			panic("First/Second Qinfifo fixup\n");
5910 		}
5911 		/*
5912 		 * ahc_swap_with_next_hscb forces our next pointer to
5913 		 * point to the reserved SCB for future commands.  Save
5914 		 * and restore our original next pointer to maintain
5915 		 * queue integrity.
5916 		 */
5917 		next = scb->hscb->next;
5918 		ahc->scb_data->scbindex[scb->hscb->tag] = NULL;
5919 		ahc_swap_with_next_hscb(ahc, scb);
5920 		scb->hscb->next = next;
5921 		ahc->qinfifo[qinstart] = scb->hscb->tag;
5922 
5923 		/* Tell the card about the new head of the qinfifo. */
5924 		ahc_outb(ahc, NEXT_QUEUED_SCB, scb->hscb->tag);
5925 
5926 		/* Fixup the tail "next" pointer. */
5927 		qintail = ahc->qinfifonext - 1;
5928 		scb = ahc_lookup_scb(ahc, ahc->qinfifo[qintail]);
5929 		scb->hscb->next = ahc->next_queued_scb->hscb->tag;
5930 	}
5931 
5932 	/*
5933 	 * Search waiting for selection list.
5934 	 */
5935 	curscbptr = ahc_inb(ahc, SCBPTR);
5936 	next = ahc_inb(ahc, WAITING_SCBH);  /* Start at head of list. */
5937 	prev = SCB_LIST_NULL;
5938 
5939 	while (next != SCB_LIST_NULL) {
5940 		uint8_t scb_index;
5941 
5942 		ahc_outb(ahc, SCBPTR, next);
5943 		scb_index = ahc_inb(ahc, SCB_TAG);
5944 		if (scb_index >= ahc->scb_data->numscbs) {
5945 			printk("Waiting List inconsistency. "
5946 			       "SCB index == %d, yet numscbs == %d.",
5947 			       scb_index, ahc->scb_data->numscbs);
5948 			ahc_dump_card_state(ahc);
5949 			panic("for safety");
5950 		}
5951 		scb = ahc_lookup_scb(ahc, scb_index);
5952 		if (scb == NULL) {
5953 			printk("scb_index = %d, next = %d\n",
5954 				scb_index, next);
5955 			panic("Waiting List traversal\n");
5956 		}
5957 		if (ahc_match_scb(ahc, scb, target, channel,
5958 				  lun, SCB_LIST_NULL, role)) {
5959 			/*
5960 			 * We found an scb that needs to be acted on.
5961 			 */
5962 			found++;
5963 			switch (action) {
5964 			case SEARCH_COMPLETE:
5965 			{
5966 				cam_status ostat;
5967 				cam_status cstat;
5968 
5969 				ostat = ahc_get_transaction_status(scb);
5970 				if (ostat == CAM_REQ_INPROG)
5971 					ahc_set_transaction_status(scb,
5972 								   status);
5973 				cstat = ahc_get_transaction_status(scb);
5974 				if (cstat != CAM_REQ_CMP)
5975 					ahc_freeze_scb(scb);
5976 				if ((scb->flags & SCB_ACTIVE) == 0)
5977 					printk("Inactive SCB in Waiting List\n");
5978 				ahc_done(ahc, scb);
5979 			}
5980 				fallthrough;
5981 			case SEARCH_REMOVE:
5982 				next = ahc_rem_wscb(ahc, next, prev);
5983 				break;
5984 			case SEARCH_COUNT:
5985 				prev = next;
5986 				next = ahc_inb(ahc, SCB_NEXT);
5987 				break;
5988 			}
5989 		} else {
5990 			prev = next;
5991 			next = ahc_inb(ahc, SCB_NEXT);
5992 		}
5993 	}
5994 	ahc_outb(ahc, SCBPTR, curscbptr);
5995 
5996 	found += ahc_search_untagged_queues(ahc, /*ahc_io_ctx_t*/NULL, target,
5997 					    channel, lun, status, action);
5998 
5999 	if (action == SEARCH_COMPLETE)
6000 		ahc_release_untagged_queues(ahc);
6001 	return (found);
6002 }
6003 
6004 int
6005 ahc_search_untagged_queues(struct ahc_softc *ahc, ahc_io_ctx_t ctx,
6006 			   int target, char channel, int lun, uint32_t status,
6007 			   ahc_search_action action)
6008 {
6009 	struct	scb *scb;
6010 	int	maxtarget;
6011 	int	found;
6012 	int	i;
6013 
6014 	if (action == SEARCH_COMPLETE) {
6015 		/*
6016 		 * Don't attempt to run any queued untagged transactions
6017 		 * until we are done with the abort process.
6018 		 */
6019 		ahc_freeze_untagged_queues(ahc);
6020 	}
6021 
6022 	found = 0;
6023 	i = 0;
6024 	if ((ahc->flags & AHC_SCB_BTT) == 0) {
6025 
6026 		maxtarget = 16;
6027 		if (target != CAM_TARGET_WILDCARD) {
6028 
6029 			i = target;
6030 			if (channel == 'B')
6031 				i += 8;
6032 			maxtarget = i + 1;
6033 		}
6034 	} else {
6035 		maxtarget = 0;
6036 	}
6037 
6038 	for (; i < maxtarget; i++) {
6039 		struct scb_tailq *untagged_q;
6040 		struct scb *next_scb;
6041 
6042 		untagged_q = &(ahc->untagged_queues[i]);
6043 		next_scb = TAILQ_FIRST(untagged_q);
6044 		while (next_scb != NULL) {
6045 
6046 			scb = next_scb;
6047 			next_scb = TAILQ_NEXT(scb, links.tqe);
6048 
6049 			/*
6050 			 * The head of the list may be the currently
6051 			 * active untagged command for a device.
6052 			 * We're only searching for commands that
6053 			 * have not been started.  A transaction
6054 			 * marked active but still in the qinfifo
6055 			 * is removed by the qinfifo scanning code
6056 			 * above.
6057 			 */
6058 			if ((scb->flags & SCB_ACTIVE) != 0)
6059 				continue;
6060 
6061 			if (ahc_match_scb(ahc, scb, target, channel, lun,
6062 					  SCB_LIST_NULL, ROLE_INITIATOR) == 0
6063 			 || (ctx != NULL && ctx != scb->io_ctx))
6064 				continue;
6065 
6066 			/*
6067 			 * We found an scb that needs to be acted on.
6068 			 */
6069 			found++;
6070 			switch (action) {
6071 			case SEARCH_COMPLETE:
6072 			{
6073 				cam_status ostat;
6074 				cam_status cstat;
6075 
6076 				ostat = ahc_get_transaction_status(scb);
6077 				if (ostat == CAM_REQ_INPROG)
6078 					ahc_set_transaction_status(scb, status);
6079 				cstat = ahc_get_transaction_status(scb);
6080 				if (cstat != CAM_REQ_CMP)
6081 					ahc_freeze_scb(scb);
6082 				if ((scb->flags & SCB_ACTIVE) == 0)
6083 					printk("Inactive SCB in untaggedQ\n");
6084 				ahc_done(ahc, scb);
6085 				break;
6086 			}
6087 			case SEARCH_REMOVE:
6088 				scb->flags &= ~SCB_UNTAGGEDQ;
6089 				TAILQ_REMOVE(untagged_q, scb, links.tqe);
6090 				break;
6091 			case SEARCH_COUNT:
6092 				break;
6093 			}
6094 		}
6095 	}
6096 
6097 	if (action == SEARCH_COMPLETE)
6098 		ahc_release_untagged_queues(ahc);
6099 	return (found);
6100 }
6101 
6102 int
6103 ahc_search_disc_list(struct ahc_softc *ahc, int target, char channel,
6104 		     int lun, u_int tag, int stop_on_first, int remove,
6105 		     int save_state)
6106 {
6107 	struct	scb *scbp;
6108 	u_int	next;
6109 	u_int	prev;
6110 	u_int	count;
6111 	u_int	active_scb;
6112 
6113 	count = 0;
6114 	next = ahc_inb(ahc, DISCONNECTED_SCBH);
6115 	prev = SCB_LIST_NULL;
6116 
6117 	if (save_state) {
6118 		/* restore this when we're done */
6119 		active_scb = ahc_inb(ahc, SCBPTR);
6120 	} else
6121 		/* Silence compiler */
6122 		active_scb = SCB_LIST_NULL;
6123 
6124 	while (next != SCB_LIST_NULL) {
6125 		u_int scb_index;
6126 
6127 		ahc_outb(ahc, SCBPTR, next);
6128 		scb_index = ahc_inb(ahc, SCB_TAG);
6129 		if (scb_index >= ahc->scb_data->numscbs) {
6130 			printk("Disconnected List inconsistency. "
6131 			       "SCB index == %d, yet numscbs == %d.",
6132 			       scb_index, ahc->scb_data->numscbs);
6133 			ahc_dump_card_state(ahc);
6134 			panic("for safety");
6135 		}
6136 
6137 		if (next == prev) {
6138 			panic("Disconnected List Loop. "
6139 			      "cur SCBPTR == %x, prev SCBPTR == %x.",
6140 			      next, prev);
6141 		}
6142 		scbp = ahc_lookup_scb(ahc, scb_index);
6143 		if (ahc_match_scb(ahc, scbp, target, channel, lun,
6144 				  tag, ROLE_INITIATOR)) {
6145 			count++;
6146 			if (remove) {
6147 				next =
6148 				    ahc_rem_scb_from_disc_list(ahc, prev, next);
6149 			} else {
6150 				prev = next;
6151 				next = ahc_inb(ahc, SCB_NEXT);
6152 			}
6153 			if (stop_on_first)
6154 				break;
6155 		} else {
6156 			prev = next;
6157 			next = ahc_inb(ahc, SCB_NEXT);
6158 		}
6159 	}
6160 	if (save_state)
6161 		ahc_outb(ahc, SCBPTR, active_scb);
6162 	return (count);
6163 }
6164 
6165 /*
6166  * Remove an SCB from the on chip list of disconnected transactions.
6167  * This is empty/unused if we are not performing SCB paging.
6168  */
6169 static u_int
6170 ahc_rem_scb_from_disc_list(struct ahc_softc *ahc, u_int prev, u_int scbptr)
6171 {
6172 	u_int next;
6173 
6174 	ahc_outb(ahc, SCBPTR, scbptr);
6175 	next = ahc_inb(ahc, SCB_NEXT);
6176 
6177 	ahc_outb(ahc, SCB_CONTROL, 0);
6178 
6179 	ahc_add_curscb_to_free_list(ahc);
6180 
6181 	if (prev != SCB_LIST_NULL) {
6182 		ahc_outb(ahc, SCBPTR, prev);
6183 		ahc_outb(ahc, SCB_NEXT, next);
6184 	} else
6185 		ahc_outb(ahc, DISCONNECTED_SCBH, next);
6186 
6187 	return (next);
6188 }
6189 
6190 /*
6191  * Add the SCB as selected by SCBPTR onto the on chip list of
6192  * free hardware SCBs.  This list is empty/unused if we are not
6193  * performing SCB paging.
6194  */
6195 static void
6196 ahc_add_curscb_to_free_list(struct ahc_softc *ahc)
6197 {
6198 	/*
6199 	 * Invalidate the tag so that our abort
6200 	 * routines don't think it's active.
6201 	 */
6202 	ahc_outb(ahc, SCB_TAG, SCB_LIST_NULL);
6203 
6204 	if ((ahc->flags & AHC_PAGESCBS) != 0) {
6205 		ahc_outb(ahc, SCB_NEXT, ahc_inb(ahc, FREE_SCBH));
6206 		ahc_outb(ahc, FREE_SCBH, ahc_inb(ahc, SCBPTR));
6207 	}
6208 }
6209 
6210 /*
6211  * Manipulate the waiting for selection list and return the
6212  * scb that follows the one that we remove.
6213  */
6214 static u_int
6215 ahc_rem_wscb(struct ahc_softc *ahc, u_int scbpos, u_int prev)
6216 {
6217 	u_int curscb, next;
6218 
6219 	/*
6220 	 * Select the SCB we want to abort and
6221 	 * pull the next pointer out of it.
6222 	 */
6223 	curscb = ahc_inb(ahc, SCBPTR);
6224 	ahc_outb(ahc, SCBPTR, scbpos);
6225 	next = ahc_inb(ahc, SCB_NEXT);
6226 
6227 	/* Clear the necessary fields */
6228 	ahc_outb(ahc, SCB_CONTROL, 0);
6229 
6230 	ahc_add_curscb_to_free_list(ahc);
6231 
6232 	/* update the waiting list */
6233 	if (prev == SCB_LIST_NULL) {
6234 		/* First in the list */
6235 		ahc_outb(ahc, WAITING_SCBH, next);
6236 
6237 		/*
6238 		 * Ensure we aren't attempting to perform
6239 		 * selection for this entry.
6240 		 */
6241 		ahc_outb(ahc, SCSISEQ, (ahc_inb(ahc, SCSISEQ) & ~ENSELO));
6242 	} else {
6243 		/*
6244 		 * Select the scb that pointed to us
6245 		 * and update its next pointer.
6246 		 */
6247 		ahc_outb(ahc, SCBPTR, prev);
6248 		ahc_outb(ahc, SCB_NEXT, next);
6249 	}
6250 
6251 	/*
6252 	 * Point us back at the original scb position.
6253 	 */
6254 	ahc_outb(ahc, SCBPTR, curscb);
6255 	return next;
6256 }
6257 
6258 /******************************** Error Handling ******************************/
6259 /*
6260  * Abort all SCBs that match the given description (target/channel/lun/tag),
6261  * setting their status to the passed in status if the status has not already
6262  * been modified from CAM_REQ_INPROG.  This routine assumes that the sequencer
6263  * is paused before it is called.
6264  */
6265 static int
6266 ahc_abort_scbs(struct ahc_softc *ahc, int target, char channel,
6267 	       int lun, u_int tag, role_t role, uint32_t status)
6268 {
6269 	struct	scb *scbp;
6270 	struct	scb *scbp_next;
6271 	u_int	active_scb;
6272 	int	i, j;
6273 	int	maxtarget;
6274 	int	minlun;
6275 	int	maxlun;
6276 
6277 	int	found;
6278 
6279 	/*
6280 	 * Don't attempt to run any queued untagged transactions
6281 	 * until we are done with the abort process.
6282 	 */
6283 	ahc_freeze_untagged_queues(ahc);
6284 
6285 	/* restore this when we're done */
6286 	active_scb = ahc_inb(ahc, SCBPTR);
6287 
6288 	found = ahc_search_qinfifo(ahc, target, channel, lun, SCB_LIST_NULL,
6289 				   role, CAM_REQUEUE_REQ, SEARCH_COMPLETE);
6290 
6291 	/*
6292 	 * Clean out the busy target table for any untagged commands.
6293 	 */
6294 	i = 0;
6295 	maxtarget = 16;
6296 	if (target != CAM_TARGET_WILDCARD) {
6297 		i = target;
6298 		if (channel == 'B')
6299 			i += 8;
6300 		maxtarget = i + 1;
6301 	}
6302 
6303 	if (lun == CAM_LUN_WILDCARD) {
6304 
6305 		/*
6306 		 * Unless we are using an SCB based
6307 		 * busy targets table, there is only
6308 		 * one table entry for all luns of
6309 		 * a target.
6310 		 */
6311 		minlun = 0;
6312 		maxlun = 1;
6313 		if ((ahc->flags & AHC_SCB_BTT) != 0)
6314 			maxlun = AHC_NUM_LUNS;
6315 	} else {
6316 		minlun = lun;
6317 		maxlun = lun + 1;
6318 	}
6319 
6320 	if (role != ROLE_TARGET) {
6321 		for (;i < maxtarget; i++) {
6322 			for (j = minlun;j < maxlun; j++) {
6323 				u_int scbid;
6324 				u_int tcl;
6325 
6326 				tcl = BUILD_TCL(i << 4, j);
6327 				scbid = ahc_index_busy_tcl(ahc, tcl);
6328 				scbp = ahc_lookup_scb(ahc, scbid);
6329 				if (scbp == NULL
6330 				 || ahc_match_scb(ahc, scbp, target, channel,
6331 						  lun, tag, role) == 0)
6332 					continue;
6333 				ahc_unbusy_tcl(ahc, BUILD_TCL(i << 4, j));
6334 			}
6335 		}
6336 
6337 		/*
6338 		 * Go through the disconnected list and remove any entries we
6339 		 * have queued for completion, 0'ing their control byte too.
6340 		 * We save the active SCB and restore it ourselves, so there
6341 		 * is no reason for this search to restore it too.
6342 		 */
6343 		ahc_search_disc_list(ahc, target, channel, lun, tag,
6344 				     /*stop_on_first*/FALSE, /*remove*/TRUE,
6345 				     /*save_state*/FALSE);
6346 	}
6347 
6348 	/*
6349 	 * Go through the hardware SCB array looking for commands that
6350 	 * were active but not on any list.  In some cases, these remnants
6351 	 * might not still have mappings in the scbindex array (e.g. unexpected
6352 	 * bus free with the same scb queued for an abort).  Don't hold this
6353 	 * against them.
6354 	 */
6355 	for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
6356 		u_int scbid;
6357 
6358 		ahc_outb(ahc, SCBPTR, i);
6359 		scbid = ahc_inb(ahc, SCB_TAG);
6360 		scbp = ahc_lookup_scb(ahc, scbid);
6361 		if ((scbp == NULL && scbid != SCB_LIST_NULL)
6362 		 || (scbp != NULL
6363 		  && ahc_match_scb(ahc, scbp, target, channel, lun, tag, role)))
6364 			ahc_add_curscb_to_free_list(ahc);
6365 	}
6366 
6367 	/*
6368 	 * Go through the pending CCB list and look for
6369 	 * commands for this target that are still active.
6370 	 * These are other tagged commands that were
6371 	 * disconnected when the reset occurred.
6372 	 */
6373 	scbp_next = LIST_FIRST(&ahc->pending_scbs);
6374 	while (scbp_next != NULL) {
6375 		scbp = scbp_next;
6376 		scbp_next = LIST_NEXT(scbp, pending_links);
6377 		if (ahc_match_scb(ahc, scbp, target, channel, lun, tag, role)) {
6378 			cam_status ostat;
6379 
6380 			ostat = ahc_get_transaction_status(scbp);
6381 			if (ostat == CAM_REQ_INPROG)
6382 				ahc_set_transaction_status(scbp, status);
6383 			if (ahc_get_transaction_status(scbp) != CAM_REQ_CMP)
6384 				ahc_freeze_scb(scbp);
6385 			if ((scbp->flags & SCB_ACTIVE) == 0)
6386 				printk("Inactive SCB on pending list\n");
6387 			ahc_done(ahc, scbp);
6388 			found++;
6389 		}
6390 	}
6391 	ahc_outb(ahc, SCBPTR, active_scb);
6392 	ahc_platform_abort_scbs(ahc, target, channel, lun, tag, role, status);
6393 	ahc_release_untagged_queues(ahc);
6394 	return found;
6395 }
6396 
6397 static void
6398 ahc_reset_current_bus(struct ahc_softc *ahc)
6399 {
6400 	uint8_t scsiseq;
6401 
6402 	ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) & ~ENSCSIRST);
6403 	scsiseq = ahc_inb(ahc, SCSISEQ);
6404 	ahc_outb(ahc, SCSISEQ, scsiseq | SCSIRSTO);
6405 	ahc_flush_device_writes(ahc);
6406 	ahc_delay(AHC_BUSRESET_DELAY);
6407 	/* Turn off the bus reset */
6408 	ahc_outb(ahc, SCSISEQ, scsiseq & ~SCSIRSTO);
6409 
6410 	ahc_clear_intstat(ahc);
6411 
6412 	/* Re-enable reset interrupts */
6413 	ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) | ENSCSIRST);
6414 }
6415 
6416 int
6417 ahc_reset_channel(struct ahc_softc *ahc, char channel, int initiate_reset)
6418 {
6419 	struct	ahc_devinfo devinfo;
6420 	u_int	initiator, target, max_scsiid;
6421 	u_int	sblkctl;
6422 	u_int	scsiseq;
6423 	u_int	simode1;
6424 	int	found;
6425 	int	restart_needed;
6426 	char	cur_channel;
6427 
6428 	ahc->pending_device = NULL;
6429 
6430 	ahc_compile_devinfo(&devinfo,
6431 			    CAM_TARGET_WILDCARD,
6432 			    CAM_TARGET_WILDCARD,
6433 			    CAM_LUN_WILDCARD,
6434 			    channel, ROLE_UNKNOWN);
6435 	ahc_pause(ahc);
6436 
6437 	/* Make sure the sequencer is in a safe location. */
6438 	ahc_clear_critical_section(ahc);
6439 
6440 	/*
6441 	 * Run our command complete fifos to ensure that we perform
6442 	 * completion processing on any commands that 'completed'
6443 	 * before the reset occurred.
6444 	 */
6445 	ahc_run_qoutfifo(ahc);
6446 #ifdef AHC_TARGET_MODE
6447 	/*
6448 	 * XXX - In Twin mode, the tqinfifo may have commands
6449 	 *	 for an unaffected channel in it.  However, if
6450 	 *	 we have run out of ATIO resources to drain that
6451 	 *	 queue, we may not get them all out here.  Further,
6452 	 *	 the blocked transactions for the reset channel
6453 	 *	 should just be killed off, irrespecitve of whether
6454 	 *	 we are blocked on ATIO resources.  Write a routine
6455 	 *	 to compact the tqinfifo appropriately.
6456 	 */
6457 	if ((ahc->flags & AHC_TARGETROLE) != 0) {
6458 		ahc_run_tqinfifo(ahc, /*paused*/TRUE);
6459 	}
6460 #endif
6461 
6462 	/*
6463 	 * Reset the bus if we are initiating this reset
6464 	 */
6465 	sblkctl = ahc_inb(ahc, SBLKCTL);
6466 	cur_channel = 'A';
6467 	if ((ahc->features & AHC_TWIN) != 0
6468 	 && ((sblkctl & SELBUSB) != 0))
6469 	    cur_channel = 'B';
6470 	scsiseq = ahc_inb(ahc, SCSISEQ_TEMPLATE);
6471 	if (cur_channel != channel) {
6472 		/* Case 1: Command for another bus is active
6473 		 * Stealthily reset the other bus without
6474 		 * upsetting the current bus.
6475 		 */
6476 		ahc_outb(ahc, SBLKCTL, sblkctl ^ SELBUSB);
6477 		simode1 = ahc_inb(ahc, SIMODE1) & ~(ENBUSFREE|ENSCSIRST);
6478 #ifdef AHC_TARGET_MODE
6479 		/*
6480 		 * Bus resets clear ENSELI, so we cannot
6481 		 * defer re-enabling bus reset interrupts
6482 		 * if we are in target mode.
6483 		 */
6484 		if ((ahc->flags & AHC_TARGETROLE) != 0)
6485 			simode1 |= ENSCSIRST;
6486 #endif
6487 		ahc_outb(ahc, SIMODE1, simode1);
6488 		if (initiate_reset)
6489 			ahc_reset_current_bus(ahc);
6490 		ahc_clear_intstat(ahc);
6491 		ahc_outb(ahc, SCSISEQ, scsiseq & (ENSELI|ENRSELI|ENAUTOATNP));
6492 		ahc_outb(ahc, SBLKCTL, sblkctl);
6493 		restart_needed = FALSE;
6494 	} else {
6495 		/* Case 2: A command from this bus is active or we're idle */
6496 		simode1 = ahc_inb(ahc, SIMODE1) & ~(ENBUSFREE|ENSCSIRST);
6497 #ifdef AHC_TARGET_MODE
6498 		/*
6499 		 * Bus resets clear ENSELI, so we cannot
6500 		 * defer re-enabling bus reset interrupts
6501 		 * if we are in target mode.
6502 		 */
6503 		if ((ahc->flags & AHC_TARGETROLE) != 0)
6504 			simode1 |= ENSCSIRST;
6505 #endif
6506 		ahc_outb(ahc, SIMODE1, simode1);
6507 		if (initiate_reset)
6508 			ahc_reset_current_bus(ahc);
6509 		ahc_clear_intstat(ahc);
6510 		ahc_outb(ahc, SCSISEQ, scsiseq & (ENSELI|ENRSELI|ENAUTOATNP));
6511 		restart_needed = TRUE;
6512 	}
6513 
6514 	/*
6515 	 * Clean up all the state information for the
6516 	 * pending transactions on this bus.
6517 	 */
6518 	found = ahc_abort_scbs(ahc, CAM_TARGET_WILDCARD, channel,
6519 			       CAM_LUN_WILDCARD, SCB_LIST_NULL,
6520 			       ROLE_UNKNOWN, CAM_SCSI_BUS_RESET);
6521 
6522 	max_scsiid = (ahc->features & AHC_WIDE) ? 15 : 7;
6523 
6524 #ifdef AHC_TARGET_MODE
6525 	/*
6526 	 * Send an immediate notify ccb to all target more peripheral
6527 	 * drivers affected by this action.
6528 	 */
6529 	for (target = 0; target <= max_scsiid; target++) {
6530 		struct ahc_tmode_tstate* tstate;
6531 		u_int lun;
6532 
6533 		tstate = ahc->enabled_targets[target];
6534 		if (tstate == NULL)
6535 			continue;
6536 		for (lun = 0; lun < AHC_NUM_LUNS; lun++) {
6537 			struct ahc_tmode_lstate* lstate;
6538 
6539 			lstate = tstate->enabled_luns[lun];
6540 			if (lstate == NULL)
6541 				continue;
6542 
6543 			ahc_queue_lstate_event(ahc, lstate, CAM_TARGET_WILDCARD,
6544 					       EVENT_TYPE_BUS_RESET, /*arg*/0);
6545 			ahc_send_lstate_events(ahc, lstate);
6546 		}
6547 	}
6548 #endif
6549 	/* Notify the XPT that a bus reset occurred */
6550 	ahc_send_async(ahc, devinfo.channel, CAM_TARGET_WILDCARD,
6551 		       CAM_LUN_WILDCARD, AC_BUS_RESET);
6552 
6553 	/*
6554 	 * Revert to async/narrow transfers until we renegotiate.
6555 	 */
6556 	for (target = 0; target <= max_scsiid; target++) {
6557 
6558 		if (ahc->enabled_targets[target] == NULL)
6559 			continue;
6560 		for (initiator = 0; initiator <= max_scsiid; initiator++) {
6561 			struct ahc_devinfo devinfo;
6562 
6563 			ahc_compile_devinfo(&devinfo, target, initiator,
6564 					    CAM_LUN_WILDCARD,
6565 					    channel, ROLE_UNKNOWN);
6566 			ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
6567 				      AHC_TRANS_CUR, /*paused*/TRUE);
6568 			ahc_set_syncrate(ahc, &devinfo, /*syncrate*/NULL,
6569 					 /*period*/0, /*offset*/0,
6570 					 /*ppr_options*/0, AHC_TRANS_CUR,
6571 					 /*paused*/TRUE);
6572 		}
6573 	}
6574 
6575 	if (restart_needed)
6576 		ahc_restart(ahc);
6577 	else
6578 		ahc_unpause(ahc);
6579 	return found;
6580 }
6581 
6582 
6583 /***************************** Residual Processing ****************************/
6584 /*
6585  * Calculate the residual for a just completed SCB.
6586  */
6587 static void
6588 ahc_calc_residual(struct ahc_softc *ahc, struct scb *scb)
6589 {
6590 	struct hardware_scb *hscb;
6591 	struct status_pkt *spkt;
6592 	uint32_t sgptr;
6593 	uint32_t resid_sgptr;
6594 	uint32_t resid;
6595 
6596 	/*
6597 	 * 5 cases.
6598 	 * 1) No residual.
6599 	 *    SG_RESID_VALID clear in sgptr.
6600 	 * 2) Transferless command
6601 	 * 3) Never performed any transfers.
6602 	 *    sgptr has SG_FULL_RESID set.
6603 	 * 4) No residual but target did not
6604 	 *    save data pointers after the
6605 	 *    last transfer, so sgptr was
6606 	 *    never updated.
6607 	 * 5) We have a partial residual.
6608 	 *    Use residual_sgptr to determine
6609 	 *    where we are.
6610 	 */
6611 
6612 	hscb = scb->hscb;
6613 	sgptr = ahc_le32toh(hscb->sgptr);
6614 	if ((sgptr & SG_RESID_VALID) == 0)
6615 		/* Case 1 */
6616 		return;
6617 	sgptr &= ~SG_RESID_VALID;
6618 
6619 	if ((sgptr & SG_LIST_NULL) != 0)
6620 		/* Case 2 */
6621 		return;
6622 
6623 	spkt = &hscb->shared_data.status;
6624 	resid_sgptr = ahc_le32toh(spkt->residual_sg_ptr);
6625 	if ((sgptr & SG_FULL_RESID) != 0) {
6626 		/* Case 3 */
6627 		resid = ahc_get_transfer_length(scb);
6628 	} else if ((resid_sgptr & SG_LIST_NULL) != 0) {
6629 		/* Case 4 */
6630 		return;
6631 	} else if ((resid_sgptr & ~SG_PTR_MASK) != 0) {
6632 		panic("Bogus resid sgptr value 0x%x\n", resid_sgptr);
6633 	} else {
6634 		struct ahc_dma_seg *sg;
6635 
6636 		/*
6637 		 * Remainder of the SG where the transfer
6638 		 * stopped.
6639 		 */
6640 		resid = ahc_le32toh(spkt->residual_datacnt) & AHC_SG_LEN_MASK;
6641 		sg = ahc_sg_bus_to_virt(scb, resid_sgptr & SG_PTR_MASK);
6642 
6643 		/* The residual sg_ptr always points to the next sg */
6644 		sg--;
6645 
6646 		/*
6647 		 * Add up the contents of all residual
6648 		 * SG segments that are after the SG where
6649 		 * the transfer stopped.
6650 		 */
6651 		while ((ahc_le32toh(sg->len) & AHC_DMA_LAST_SEG) == 0) {
6652 			sg++;
6653 			resid += ahc_le32toh(sg->len) & AHC_SG_LEN_MASK;
6654 		}
6655 	}
6656 	if ((scb->flags & SCB_SENSE) == 0)
6657 		ahc_set_residual(scb, resid);
6658 	else
6659 		ahc_set_sense_residual(scb, resid);
6660 
6661 #ifdef AHC_DEBUG
6662 	if ((ahc_debug & AHC_SHOW_MISC) != 0) {
6663 		ahc_print_path(ahc, scb);
6664 		printk("Handled %sResidual of %d bytes\n",
6665 		       (scb->flags & SCB_SENSE) ? "Sense " : "", resid);
6666 	}
6667 #endif
6668 }
6669 
6670 /******************************* Target Mode **********************************/
6671 #ifdef AHC_TARGET_MODE
6672 /*
6673  * Add a target mode event to this lun's queue
6674  */
6675 static void
6676 ahc_queue_lstate_event(struct ahc_softc *ahc, struct ahc_tmode_lstate *lstate,
6677 		       u_int initiator_id, u_int event_type, u_int event_arg)
6678 {
6679 	struct ahc_tmode_event *event;
6680 	int pending;
6681 
6682 	xpt_freeze_devq(lstate->path, /*count*/1);
6683 	if (lstate->event_w_idx >= lstate->event_r_idx)
6684 		pending = lstate->event_w_idx - lstate->event_r_idx;
6685 	else
6686 		pending = AHC_TMODE_EVENT_BUFFER_SIZE + 1
6687 			- (lstate->event_r_idx - lstate->event_w_idx);
6688 
6689 	if (event_type == EVENT_TYPE_BUS_RESET
6690 	 || event_type == TARGET_RESET) {
6691 		/*
6692 		 * Any earlier events are irrelevant, so reset our buffer.
6693 		 * This has the effect of allowing us to deal with reset
6694 		 * floods (an external device holding down the reset line)
6695 		 * without losing the event that is really interesting.
6696 		 */
6697 		lstate->event_r_idx = 0;
6698 		lstate->event_w_idx = 0;
6699 		xpt_release_devq(lstate->path, pending, /*runqueue*/FALSE);
6700 	}
6701 
6702 	if (pending == AHC_TMODE_EVENT_BUFFER_SIZE) {
6703 		xpt_print_path(lstate->path);
6704 		printk("immediate event %x:%x lost\n",
6705 		       lstate->event_buffer[lstate->event_r_idx].event_type,
6706 		       lstate->event_buffer[lstate->event_r_idx].event_arg);
6707 		lstate->event_r_idx++;
6708 		if (lstate->event_r_idx == AHC_TMODE_EVENT_BUFFER_SIZE)
6709 			lstate->event_r_idx = 0;
6710 		xpt_release_devq(lstate->path, /*count*/1, /*runqueue*/FALSE);
6711 	}
6712 
6713 	event = &lstate->event_buffer[lstate->event_w_idx];
6714 	event->initiator_id = initiator_id;
6715 	event->event_type = event_type;
6716 	event->event_arg = event_arg;
6717 	lstate->event_w_idx++;
6718 	if (lstate->event_w_idx == AHC_TMODE_EVENT_BUFFER_SIZE)
6719 		lstate->event_w_idx = 0;
6720 }
6721 
6722 /*
6723  * Send any target mode events queued up waiting
6724  * for immediate notify resources.
6725  */
6726 void
6727 ahc_send_lstate_events(struct ahc_softc *ahc, struct ahc_tmode_lstate *lstate)
6728 {
6729 	struct ccb_hdr *ccbh;
6730 	struct ccb_immed_notify *inot;
6731 
6732 	while (lstate->event_r_idx != lstate->event_w_idx
6733 	    && (ccbh = SLIST_FIRST(&lstate->immed_notifies)) != NULL) {
6734 		struct ahc_tmode_event *event;
6735 
6736 		event = &lstate->event_buffer[lstate->event_r_idx];
6737 		SLIST_REMOVE_HEAD(&lstate->immed_notifies, sim_links.sle);
6738 		inot = (struct ccb_immed_notify *)ccbh;
6739 		switch (event->event_type) {
6740 		case EVENT_TYPE_BUS_RESET:
6741 			ccbh->status = CAM_SCSI_BUS_RESET|CAM_DEV_QFRZN;
6742 			break;
6743 		default:
6744 			ccbh->status = CAM_MESSAGE_RECV|CAM_DEV_QFRZN;
6745 			inot->message_args[0] = event->event_type;
6746 			inot->message_args[1] = event->event_arg;
6747 			break;
6748 		}
6749 		inot->initiator_id = event->initiator_id;
6750 		inot->sense_len = 0;
6751 		xpt_done((union ccb *)inot);
6752 		lstate->event_r_idx++;
6753 		if (lstate->event_r_idx == AHC_TMODE_EVENT_BUFFER_SIZE)
6754 			lstate->event_r_idx = 0;
6755 	}
6756 }
6757 #endif
6758 
6759 /******************** Sequencer Program Patching/Download *********************/
6760 
6761 #ifdef AHC_DUMP_SEQ
6762 void
6763 ahc_dumpseq(struct ahc_softc* ahc)
6764 {
6765 	int i;
6766 
6767 	ahc_outb(ahc, SEQCTL, PERRORDIS|FAILDIS|FASTMODE|LOADRAM);
6768 	ahc_outb(ahc, SEQADDR0, 0);
6769 	ahc_outb(ahc, SEQADDR1, 0);
6770 	for (i = 0; i < ahc->instruction_ram_size; i++) {
6771 		uint8_t ins_bytes[4];
6772 
6773 		ahc_insb(ahc, SEQRAM, ins_bytes, 4);
6774 		printk("0x%08x\n", ins_bytes[0] << 24
6775 				 | ins_bytes[1] << 16
6776 				 | ins_bytes[2] << 8
6777 				 | ins_bytes[3]);
6778 	}
6779 }
6780 #endif
6781 
6782 static int
6783 ahc_loadseq(struct ahc_softc *ahc)
6784 {
6785 	struct	cs cs_table[NUM_CRITICAL_SECTIONS];
6786 	u_int	begin_set[NUM_CRITICAL_SECTIONS];
6787 	u_int	end_set[NUM_CRITICAL_SECTIONS];
6788 	const struct patch *cur_patch;
6789 	u_int	cs_count;
6790 	u_int	cur_cs;
6791 	u_int	i;
6792 	u_int	skip_addr;
6793 	u_int	sg_prefetch_cnt;
6794 	int	downloaded;
6795 	uint8_t	download_consts[7];
6796 
6797 	/*
6798 	 * Start out with 0 critical sections
6799 	 * that apply to this firmware load.
6800 	 */
6801 	cs_count = 0;
6802 	cur_cs = 0;
6803 	memset(begin_set, 0, sizeof(begin_set));
6804 	memset(end_set, 0, sizeof(end_set));
6805 
6806 	/* Setup downloadable constant table */
6807 	download_consts[QOUTFIFO_OFFSET] = 0;
6808 	if (ahc->targetcmds != NULL)
6809 		download_consts[QOUTFIFO_OFFSET] += 32;
6810 	download_consts[QINFIFO_OFFSET] = download_consts[QOUTFIFO_OFFSET] + 1;
6811 	download_consts[CACHESIZE_MASK] = ahc->pci_cachesize - 1;
6812 	download_consts[INVERTED_CACHESIZE_MASK] = ~(ahc->pci_cachesize - 1);
6813 	sg_prefetch_cnt = ahc->pci_cachesize;
6814 	if (sg_prefetch_cnt < (2 * sizeof(struct ahc_dma_seg)))
6815 		sg_prefetch_cnt = 2 * sizeof(struct ahc_dma_seg);
6816 	download_consts[SG_PREFETCH_CNT] = sg_prefetch_cnt;
6817 	download_consts[SG_PREFETCH_ALIGN_MASK] = ~(sg_prefetch_cnt - 1);
6818 	download_consts[SG_PREFETCH_ADDR_MASK] = (sg_prefetch_cnt - 1);
6819 
6820 	cur_patch = patches;
6821 	downloaded = 0;
6822 	skip_addr = 0;
6823 	ahc_outb(ahc, SEQCTL, PERRORDIS|FAILDIS|FASTMODE|LOADRAM);
6824 	ahc_outb(ahc, SEQADDR0, 0);
6825 	ahc_outb(ahc, SEQADDR1, 0);
6826 
6827 	for (i = 0; i < sizeof(seqprog)/4; i++) {
6828 		if (ahc_check_patch(ahc, &cur_patch, i, &skip_addr) == 0) {
6829 			/*
6830 			 * Don't download this instruction as it
6831 			 * is in a patch that was removed.
6832 			 */
6833 			continue;
6834 		}
6835 
6836 		if (downloaded == ahc->instruction_ram_size) {
6837 			/*
6838 			 * We're about to exceed the instruction
6839 			 * storage capacity for this chip.  Fail
6840 			 * the load.
6841 			 */
6842 			printk("\n%s: Program too large for instruction memory "
6843 			       "size of %d!\n", ahc_name(ahc),
6844 			       ahc->instruction_ram_size);
6845 			return (ENOMEM);
6846 		}
6847 
6848 		/*
6849 		 * Move through the CS table until we find a CS
6850 		 * that might apply to this instruction.
6851 		 */
6852 		for (; cur_cs < NUM_CRITICAL_SECTIONS; cur_cs++) {
6853 			if (critical_sections[cur_cs].end <= i) {
6854 				if (begin_set[cs_count] == TRUE
6855 				 && end_set[cs_count] == FALSE) {
6856 					cs_table[cs_count].end = downloaded;
6857 					end_set[cs_count] = TRUE;
6858 					cs_count++;
6859 				}
6860 				continue;
6861 			}
6862 			if (critical_sections[cur_cs].begin <= i
6863 			 && begin_set[cs_count] == FALSE) {
6864 				cs_table[cs_count].begin = downloaded;
6865 				begin_set[cs_count] = TRUE;
6866 			}
6867 			break;
6868 		}
6869 		ahc_download_instr(ahc, i, download_consts);
6870 		downloaded++;
6871 	}
6872 
6873 	ahc->num_critical_sections = cs_count;
6874 	if (cs_count != 0) {
6875 
6876 		cs_count *= sizeof(struct cs);
6877 		ahc->critical_sections = kmemdup(cs_table, cs_count, GFP_ATOMIC);
6878 		if (ahc->critical_sections == NULL)
6879 			panic("ahc_loadseq: Could not malloc");
6880 	}
6881 	ahc_outb(ahc, SEQCTL, PERRORDIS|FAILDIS|FASTMODE);
6882 
6883 	if (bootverbose) {
6884 		printk(" %d instructions downloaded\n", downloaded);
6885 		printk("%s: Features 0x%x, Bugs 0x%x, Flags 0x%x\n",
6886 		       ahc_name(ahc), ahc->features, ahc->bugs, ahc->flags);
6887 	}
6888 	return (0);
6889 }
6890 
6891 static int
6892 ahc_check_patch(struct ahc_softc *ahc, const struct patch **start_patch,
6893 		u_int start_instr, u_int *skip_addr)
6894 {
6895 	const struct patch *cur_patch;
6896 	const struct patch *last_patch;
6897 	u_int	num_patches;
6898 
6899 	num_patches = ARRAY_SIZE(patches);
6900 	last_patch = &patches[num_patches];
6901 	cur_patch = *start_patch;
6902 
6903 	while (cur_patch < last_patch && start_instr == cur_patch->begin) {
6904 
6905 		if (cur_patch->patch_func(ahc) == 0) {
6906 
6907 			/* Start rejecting code */
6908 			*skip_addr = start_instr + cur_patch->skip_instr;
6909 			cur_patch += cur_patch->skip_patch;
6910 		} else {
6911 			/* Accepted this patch.  Advance to the next
6912 			 * one and wait for our intruction pointer to
6913 			 * hit this point.
6914 			 */
6915 			cur_patch++;
6916 		}
6917 	}
6918 
6919 	*start_patch = cur_patch;
6920 	if (start_instr < *skip_addr)
6921 		/* Still skipping */
6922 		return (0);
6923 
6924 	return (1);
6925 }
6926 
6927 static void
6928 ahc_download_instr(struct ahc_softc *ahc, u_int instrptr, uint8_t *dconsts)
6929 {
6930 	union	ins_formats instr;
6931 	struct	ins_format1 *fmt1_ins;
6932 	struct	ins_format3 *fmt3_ins;
6933 	u_int	opcode;
6934 
6935 	/*
6936 	 * The firmware is always compiled into a little endian format.
6937 	 */
6938 	instr.integer = ahc_le32toh(*(uint32_t*)&seqprog[instrptr * 4]);
6939 
6940 	fmt1_ins = &instr.format1;
6941 	fmt3_ins = NULL;
6942 
6943 	/* Pull the opcode */
6944 	opcode = instr.format1.opcode;
6945 	switch (opcode) {
6946 	case AIC_OP_JMP:
6947 	case AIC_OP_JC:
6948 	case AIC_OP_JNC:
6949 	case AIC_OP_CALL:
6950 	case AIC_OP_JNE:
6951 	case AIC_OP_JNZ:
6952 	case AIC_OP_JE:
6953 	case AIC_OP_JZ:
6954 	{
6955 		const struct patch *cur_patch;
6956 		int address_offset;
6957 		u_int address;
6958 		u_int skip_addr;
6959 		u_int i;
6960 
6961 		fmt3_ins = &instr.format3;
6962 		address_offset = 0;
6963 		address = fmt3_ins->address;
6964 		cur_patch = patches;
6965 		skip_addr = 0;
6966 
6967 		for (i = 0; i < address;) {
6968 
6969 			ahc_check_patch(ahc, &cur_patch, i, &skip_addr);
6970 
6971 			if (skip_addr > i) {
6972 				int end_addr;
6973 
6974 				end_addr = min(address, skip_addr);
6975 				address_offset += end_addr - i;
6976 				i = skip_addr;
6977 			} else {
6978 				i++;
6979 			}
6980 		}
6981 		address -= address_offset;
6982 		fmt3_ins->address = address;
6983 	}
6984 		fallthrough;
6985 	case AIC_OP_OR:
6986 	case AIC_OP_AND:
6987 	case AIC_OP_XOR:
6988 	case AIC_OP_ADD:
6989 	case AIC_OP_ADC:
6990 	case AIC_OP_BMOV:
6991 		if (fmt1_ins->parity != 0) {
6992 			fmt1_ins->immediate = dconsts[fmt1_ins->immediate];
6993 		}
6994 		fmt1_ins->parity = 0;
6995 		if ((ahc->features & AHC_CMD_CHAN) == 0
6996 		 && opcode == AIC_OP_BMOV) {
6997 			/*
6998 			 * Block move was added at the same time
6999 			 * as the command channel.  Verify that
7000 			 * this is only a move of a single element
7001 			 * and convert the BMOV to a MOV
7002 			 * (AND with an immediate of FF).
7003 			 */
7004 			if (fmt1_ins->immediate != 1)
7005 				panic("%s: BMOV not supported\n",
7006 				      ahc_name(ahc));
7007 			fmt1_ins->opcode = AIC_OP_AND;
7008 			fmt1_ins->immediate = 0xff;
7009 		}
7010 		fallthrough;
7011 	case AIC_OP_ROL:
7012 		if ((ahc->features & AHC_ULTRA2) != 0) {
7013 			int i, count;
7014 
7015 			/* Calculate odd parity for the instruction */
7016 			for (i = 0, count = 0; i < 31; i++) {
7017 				uint32_t mask;
7018 
7019 				mask = 0x01 << i;
7020 				if ((instr.integer & mask) != 0)
7021 					count++;
7022 			}
7023 			if ((count & 0x01) == 0)
7024 				instr.format1.parity = 1;
7025 		} else {
7026 			/* Compress the instruction for older sequencers */
7027 			if (fmt3_ins != NULL) {
7028 				instr.integer =
7029 					fmt3_ins->immediate
7030 				      | (fmt3_ins->source << 8)
7031 				      | (fmt3_ins->address << 16)
7032 				      |	(fmt3_ins->opcode << 25);
7033 			} else {
7034 				instr.integer =
7035 					fmt1_ins->immediate
7036 				      | (fmt1_ins->source << 8)
7037 				      | (fmt1_ins->destination << 16)
7038 				      |	(fmt1_ins->ret << 24)
7039 				      |	(fmt1_ins->opcode << 25);
7040 			}
7041 		}
7042 		/* The sequencer is a little endian cpu */
7043 		instr.integer = ahc_htole32(instr.integer);
7044 		ahc_outsb(ahc, SEQRAM, instr.bytes, 4);
7045 		break;
7046 	default:
7047 		panic("Unknown opcode encountered in seq program");
7048 		break;
7049 	}
7050 }
7051 
7052 int
7053 ahc_print_register(const ahc_reg_parse_entry_t *table, u_int num_entries,
7054 		   const char *name, u_int address, u_int value,
7055 		   u_int *cur_column, u_int wrap_point)
7056 {
7057 	int	printed;
7058 	u_int	printed_mask;
7059 
7060 	if (cur_column != NULL && *cur_column >= wrap_point) {
7061 		printk("\n");
7062 		*cur_column = 0;
7063 	}
7064 	printed  = printk("%s[0x%x]", name, value);
7065 	if (table == NULL) {
7066 		printed += printk(" ");
7067 		*cur_column += printed;
7068 		return (printed);
7069 	}
7070 	printed_mask = 0;
7071 	while (printed_mask != 0xFF) {
7072 		int entry;
7073 
7074 		for (entry = 0; entry < num_entries; entry++) {
7075 			if (((value & table[entry].mask)
7076 			  != table[entry].value)
7077 			 || ((printed_mask & table[entry].mask)
7078 			  == table[entry].mask))
7079 				continue;
7080 
7081 			printed += printk("%s%s",
7082 					  printed_mask == 0 ? ":(" : "|",
7083 					  table[entry].name);
7084 			printed_mask |= table[entry].mask;
7085 			break;
7086 		}
7087 		if (entry >= num_entries)
7088 			break;
7089 	}
7090 	if (printed_mask != 0)
7091 		printed += printk(") ");
7092 	else
7093 		printed += printk(" ");
7094 	if (cur_column != NULL)
7095 		*cur_column += printed;
7096 	return (printed);
7097 }
7098 
7099 void
7100 ahc_dump_card_state(struct ahc_softc *ahc)
7101 {
7102 	struct	scb *scb;
7103 	struct	scb_tailq *untagged_q;
7104 	u_int	cur_col;
7105 	int	paused;
7106 	int	target;
7107 	int	maxtarget;
7108 	int	i;
7109 	uint8_t last_phase;
7110 	uint8_t qinpos;
7111 	uint8_t qintail;
7112 	uint8_t qoutpos;
7113 	uint8_t scb_index;
7114 	uint8_t saved_scbptr;
7115 
7116 	if (ahc_is_paused(ahc)) {
7117 		paused = 1;
7118 	} else {
7119 		paused = 0;
7120 		ahc_pause(ahc);
7121 	}
7122 
7123 	saved_scbptr = ahc_inb(ahc, SCBPTR);
7124 	last_phase = ahc_inb(ahc, LASTPHASE);
7125 	printk(">>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<\n"
7126 	       "%s: Dumping Card State %s, at SEQADDR 0x%x\n",
7127 	       ahc_name(ahc), ahc_lookup_phase_entry(last_phase)->phasemsg,
7128 	       ahc_inb(ahc, SEQADDR0) | (ahc_inb(ahc, SEQADDR1) << 8));
7129 	if (paused)
7130 		printk("Card was paused\n");
7131 	printk("ACCUM = 0x%x, SINDEX = 0x%x, DINDEX = 0x%x, ARG_2 = 0x%x\n",
7132 	       ahc_inb(ahc, ACCUM), ahc_inb(ahc, SINDEX), ahc_inb(ahc, DINDEX),
7133 	       ahc_inb(ahc, ARG_2));
7134 	printk("HCNT = 0x%x SCBPTR = 0x%x\n", ahc_inb(ahc, HCNT),
7135 	       ahc_inb(ahc, SCBPTR));
7136 	cur_col = 0;
7137 	if ((ahc->features & AHC_DT) != 0)
7138 		ahc_scsiphase_print(ahc_inb(ahc, SCSIPHASE), &cur_col, 50);
7139 	ahc_scsisigi_print(ahc_inb(ahc, SCSISIGI), &cur_col, 50);
7140 	ahc_error_print(ahc_inb(ahc, ERROR), &cur_col, 50);
7141 	ahc_scsibusl_print(ahc_inb(ahc, SCSIBUSL), &cur_col, 50);
7142 	ahc_lastphase_print(ahc_inb(ahc, LASTPHASE), &cur_col, 50);
7143 	ahc_scsiseq_print(ahc_inb(ahc, SCSISEQ), &cur_col, 50);
7144 	ahc_sblkctl_print(ahc_inb(ahc, SBLKCTL), &cur_col, 50);
7145 	ahc_scsirate_print(ahc_inb(ahc, SCSIRATE), &cur_col, 50);
7146 	ahc_seqctl_print(ahc_inb(ahc, SEQCTL), &cur_col, 50);
7147 	ahc_seq_flags_print(ahc_inb(ahc, SEQ_FLAGS), &cur_col, 50);
7148 	ahc_sstat0_print(ahc_inb(ahc, SSTAT0), &cur_col, 50);
7149 	ahc_sstat1_print(ahc_inb(ahc, SSTAT1), &cur_col, 50);
7150 	ahc_sstat2_print(ahc_inb(ahc, SSTAT2), &cur_col, 50);
7151 	ahc_sstat3_print(ahc_inb(ahc, SSTAT3), &cur_col, 50);
7152 	ahc_simode0_print(ahc_inb(ahc, SIMODE0), &cur_col, 50);
7153 	ahc_simode1_print(ahc_inb(ahc, SIMODE1), &cur_col, 50);
7154 	ahc_sxfrctl0_print(ahc_inb(ahc, SXFRCTL0), &cur_col, 50);
7155 	ahc_dfcntrl_print(ahc_inb(ahc, DFCNTRL), &cur_col, 50);
7156 	ahc_dfstatus_print(ahc_inb(ahc, DFSTATUS), &cur_col, 50);
7157 	if (cur_col != 0)
7158 		printk("\n");
7159 	printk("STACK:");
7160 	for (i = 0; i < STACK_SIZE; i++)
7161 		printk(" 0x%x", ahc_inb(ahc, STACK)|(ahc_inb(ahc, STACK) << 8));
7162 	printk("\nSCB count = %d\n", ahc->scb_data->numscbs);
7163 	printk("Kernel NEXTQSCB = %d\n", ahc->next_queued_scb->hscb->tag);
7164 	printk("Card NEXTQSCB = %d\n", ahc_inb(ahc, NEXT_QUEUED_SCB));
7165 	/* QINFIFO */
7166 	printk("QINFIFO entries: ");
7167 	if ((ahc->features & AHC_QUEUE_REGS) != 0) {
7168 		qinpos = ahc_inb(ahc, SNSCB_QOFF);
7169 		ahc_outb(ahc, SNSCB_QOFF, qinpos);
7170 	} else
7171 		qinpos = ahc_inb(ahc, QINPOS);
7172 	qintail = ahc->qinfifonext;
7173 	while (qinpos != qintail) {
7174 		printk("%d ", ahc->qinfifo[qinpos]);
7175 		qinpos++;
7176 	}
7177 	printk("\n");
7178 
7179 	printk("Waiting Queue entries: ");
7180 	scb_index = ahc_inb(ahc, WAITING_SCBH);
7181 	i = 0;
7182 	while (scb_index != SCB_LIST_NULL && i++ < 256) {
7183 		ahc_outb(ahc, SCBPTR, scb_index);
7184 		printk("%d:%d ", scb_index, ahc_inb(ahc, SCB_TAG));
7185 		scb_index = ahc_inb(ahc, SCB_NEXT);
7186 	}
7187 	printk("\n");
7188 
7189 	printk("Disconnected Queue entries: ");
7190 	scb_index = ahc_inb(ahc, DISCONNECTED_SCBH);
7191 	i = 0;
7192 	while (scb_index != SCB_LIST_NULL && i++ < 256) {
7193 		ahc_outb(ahc, SCBPTR, scb_index);
7194 		printk("%d:%d ", scb_index, ahc_inb(ahc, SCB_TAG));
7195 		scb_index = ahc_inb(ahc, SCB_NEXT);
7196 	}
7197 	printk("\n");
7198 
7199 	ahc_sync_qoutfifo(ahc, BUS_DMASYNC_POSTREAD);
7200 	printk("QOUTFIFO entries: ");
7201 	qoutpos = ahc->qoutfifonext;
7202 	i = 0;
7203 	while (ahc->qoutfifo[qoutpos] != SCB_LIST_NULL && i++ < 256) {
7204 		printk("%d ", ahc->qoutfifo[qoutpos]);
7205 		qoutpos++;
7206 	}
7207 	printk("\n");
7208 
7209 	printk("Sequencer Free SCB List: ");
7210 	scb_index = ahc_inb(ahc, FREE_SCBH);
7211 	i = 0;
7212 	while (scb_index != SCB_LIST_NULL && i++ < 256) {
7213 		ahc_outb(ahc, SCBPTR, scb_index);
7214 		printk("%d ", scb_index);
7215 		scb_index = ahc_inb(ahc, SCB_NEXT);
7216 	}
7217 	printk("\n");
7218 
7219 	printk("Sequencer SCB Info: ");
7220 	for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
7221 		ahc_outb(ahc, SCBPTR, i);
7222 		cur_col  = printk("\n%3d ", i);
7223 
7224 		ahc_scb_control_print(ahc_inb(ahc, SCB_CONTROL), &cur_col, 60);
7225 		ahc_scb_scsiid_print(ahc_inb(ahc, SCB_SCSIID), &cur_col, 60);
7226 		ahc_scb_lun_print(ahc_inb(ahc, SCB_LUN), &cur_col, 60);
7227 		ahc_scb_tag_print(ahc_inb(ahc, SCB_TAG), &cur_col, 60);
7228 	}
7229 	printk("\n");
7230 
7231 	printk("Pending list: ");
7232 	i = 0;
7233 	LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) {
7234 		if (i++ > 256)
7235 			break;
7236 		cur_col  = printk("\n%3d ", scb->hscb->tag);
7237 		ahc_scb_control_print(scb->hscb->control, &cur_col, 60);
7238 		ahc_scb_scsiid_print(scb->hscb->scsiid, &cur_col, 60);
7239 		ahc_scb_lun_print(scb->hscb->lun, &cur_col, 60);
7240 		if ((ahc->flags & AHC_PAGESCBS) == 0) {
7241 			ahc_outb(ahc, SCBPTR, scb->hscb->tag);
7242 			printk("(");
7243 			ahc_scb_control_print(ahc_inb(ahc, SCB_CONTROL),
7244 					      &cur_col, 60);
7245 			ahc_scb_tag_print(ahc_inb(ahc, SCB_TAG), &cur_col, 60);
7246 			printk(")");
7247 		}
7248 	}
7249 	printk("\n");
7250 
7251 	printk("Kernel Free SCB list: ");
7252 	i = 0;
7253 	SLIST_FOREACH(scb, &ahc->scb_data->free_scbs, links.sle) {
7254 		if (i++ > 256)
7255 			break;
7256 		printk("%d ", scb->hscb->tag);
7257 	}
7258 	printk("\n");
7259 
7260 	maxtarget = (ahc->features & (AHC_WIDE|AHC_TWIN)) ? 15 : 7;
7261 	for (target = 0; target <= maxtarget; target++) {
7262 		untagged_q = &ahc->untagged_queues[target];
7263 		if (TAILQ_FIRST(untagged_q) == NULL)
7264 			continue;
7265 		printk("Untagged Q(%d): ", target);
7266 		i = 0;
7267 		TAILQ_FOREACH(scb, untagged_q, links.tqe) {
7268 			if (i++ > 256)
7269 				break;
7270 			printk("%d ", scb->hscb->tag);
7271 		}
7272 		printk("\n");
7273 	}
7274 
7275 	printk("\n<<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>>\n");
7276 	ahc_outb(ahc, SCBPTR, saved_scbptr);
7277 	if (paused == 0)
7278 		ahc_unpause(ahc);
7279 }
7280 
7281 /************************* Target Mode ****************************************/
7282 #ifdef AHC_TARGET_MODE
7283 cam_status
7284 ahc_find_tmode_devs(struct ahc_softc *ahc, struct cam_sim *sim, union ccb *ccb,
7285 		    struct ahc_tmode_tstate **tstate,
7286 		    struct ahc_tmode_lstate **lstate,
7287 		    int notfound_failure)
7288 {
7289 
7290 	if ((ahc->features & AHC_TARGETMODE) == 0)
7291 		return (CAM_REQ_INVALID);
7292 
7293 	/*
7294 	 * Handle the 'black hole' device that sucks up
7295 	 * requests to unattached luns on enabled targets.
7296 	 */
7297 	if (ccb->ccb_h.target_id == CAM_TARGET_WILDCARD
7298 	 && ccb->ccb_h.target_lun == CAM_LUN_WILDCARD) {
7299 		*tstate = NULL;
7300 		*lstate = ahc->black_hole;
7301 	} else {
7302 		u_int max_id;
7303 
7304 		max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
7305 		if (ccb->ccb_h.target_id >= max_id)
7306 			return (CAM_TID_INVALID);
7307 
7308 		if (ccb->ccb_h.target_lun >= AHC_NUM_LUNS)
7309 			return (CAM_LUN_INVALID);
7310 
7311 		*tstate = ahc->enabled_targets[ccb->ccb_h.target_id];
7312 		*lstate = NULL;
7313 		if (*tstate != NULL)
7314 			*lstate =
7315 			    (*tstate)->enabled_luns[ccb->ccb_h.target_lun];
7316 	}
7317 
7318 	if (notfound_failure != 0 && *lstate == NULL)
7319 		return (CAM_PATH_INVALID);
7320 
7321 	return (CAM_REQ_CMP);
7322 }
7323 
7324 void
7325 ahc_handle_en_lun(struct ahc_softc *ahc, struct cam_sim *sim, union ccb *ccb)
7326 {
7327 	struct	   ahc_tmode_tstate *tstate;
7328 	struct	   ahc_tmode_lstate *lstate;
7329 	struct	   ccb_en_lun *cel;
7330 	cam_status status;
7331 	u_long	   s;
7332 	u_int	   target;
7333 	u_int	   lun;
7334 	u_int	   target_mask;
7335 	u_int	   our_id;
7336 	int	   error;
7337 	char	   channel;
7338 
7339 	status = ahc_find_tmode_devs(ahc, sim, ccb, &tstate, &lstate,
7340 				     /*notfound_failure*/FALSE);
7341 
7342 	if (status != CAM_REQ_CMP) {
7343 		ccb->ccb_h.status = status;
7344 		return;
7345 	}
7346 
7347 	if (cam_sim_bus(sim) == 0)
7348 		our_id = ahc->our_id;
7349 	else
7350 		our_id = ahc->our_id_b;
7351 
7352 	if (ccb->ccb_h.target_id != our_id) {
7353 		/*
7354 		 * our_id represents our initiator ID, or
7355 		 * the ID of the first target to have an
7356 		 * enabled lun in target mode.  There are
7357 		 * two cases that may preclude enabling a
7358 		 * target id other than our_id.
7359 		 *
7360 		 *   o our_id is for an active initiator role.
7361 		 *     Since the hardware does not support
7362 		 *     reselections to the initiator role at
7363 		 *     anything other than our_id, and our_id
7364 		 *     is used by the hardware to indicate the
7365 		 *     ID to use for both select-out and
7366 		 *     reselect-out operations, the only target
7367 		 *     ID we can support in this mode is our_id.
7368 		 *
7369 		 *   o The MULTARGID feature is not available and
7370 		 *     a previous target mode ID has been enabled.
7371 		 */
7372 		if ((ahc->features & AHC_MULTIROLE) != 0) {
7373 
7374 			if ((ahc->features & AHC_MULTI_TID) != 0
7375 			 && (ahc->flags & AHC_INITIATORROLE) != 0) {
7376 				/*
7377 				 * Only allow additional targets if
7378 				 * the initiator role is disabled.
7379 				 * The hardware cannot handle a re-select-in
7380 				 * on the initiator id during a re-select-out
7381 				 * on a different target id.
7382 				 */
7383 				status = CAM_TID_INVALID;
7384 			} else if ((ahc->flags & AHC_INITIATORROLE) != 0
7385 				|| ahc->enabled_luns > 0) {
7386 				/*
7387 				 * Only allow our target id to change
7388 				 * if the initiator role is not configured
7389 				 * and there are no enabled luns which
7390 				 * are attached to the currently registered
7391 				 * scsi id.
7392 				 */
7393 				status = CAM_TID_INVALID;
7394 			}
7395 		} else if ((ahc->features & AHC_MULTI_TID) == 0
7396 			&& ahc->enabled_luns > 0) {
7397 
7398 			status = CAM_TID_INVALID;
7399 		}
7400 	}
7401 
7402 	if (status != CAM_REQ_CMP) {
7403 		ccb->ccb_h.status = status;
7404 		return;
7405 	}
7406 
7407 	/*
7408 	 * We now have an id that is valid.
7409 	 * If we aren't in target mode, switch modes.
7410 	 */
7411 	if ((ahc->flags & AHC_TARGETROLE) == 0
7412 	 && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) {
7413 		u_long	 s;
7414 		ahc_flag saved_flags;
7415 
7416 		printk("Configuring Target Mode\n");
7417 		ahc_lock(ahc, &s);
7418 		if (LIST_FIRST(&ahc->pending_scbs) != NULL) {
7419 			ccb->ccb_h.status = CAM_BUSY;
7420 			ahc_unlock(ahc, &s);
7421 			return;
7422 		}
7423 		saved_flags = ahc->flags;
7424 		ahc->flags |= AHC_TARGETROLE;
7425 		if ((ahc->features & AHC_MULTIROLE) == 0)
7426 			ahc->flags &= ~AHC_INITIATORROLE;
7427 		ahc_pause(ahc);
7428 		error = ahc_loadseq(ahc);
7429 		if (error != 0) {
7430 			/*
7431 			 * Restore original configuration and notify
7432 			 * the caller that we cannot support target mode.
7433 			 * Since the adapter started out in this
7434 			 * configuration, the firmware load will succeed,
7435 			 * so there is no point in checking ahc_loadseq's
7436 			 * return value.
7437 			 */
7438 			ahc->flags = saved_flags;
7439 			(void)ahc_loadseq(ahc);
7440 			ahc_restart(ahc);
7441 			ahc_unlock(ahc, &s);
7442 			ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
7443 			return;
7444 		}
7445 		ahc_restart(ahc);
7446 		ahc_unlock(ahc, &s);
7447 	}
7448 	cel = &ccb->cel;
7449 	target = ccb->ccb_h.target_id;
7450 	lun = ccb->ccb_h.target_lun;
7451 	channel = SIM_CHANNEL(ahc, sim);
7452 	target_mask = 0x01 << target;
7453 	if (channel == 'B')
7454 		target_mask <<= 8;
7455 
7456 	if (cel->enable != 0) {
7457 		u_int scsiseq;
7458 
7459 		/* Are we already enabled?? */
7460 		if (lstate != NULL) {
7461 			xpt_print_path(ccb->ccb_h.path);
7462 			printk("Lun already enabled\n");
7463 			ccb->ccb_h.status = CAM_LUN_ALRDY_ENA;
7464 			return;
7465 		}
7466 
7467 		if (cel->grp6_len != 0
7468 		 || cel->grp7_len != 0) {
7469 			/*
7470 			 * Don't (yet?) support vendor
7471 			 * specific commands.
7472 			 */
7473 			ccb->ccb_h.status = CAM_REQ_INVALID;
7474 			printk("Non-zero Group Codes\n");
7475 			return;
7476 		}
7477 
7478 		/*
7479 		 * Seems to be okay.
7480 		 * Setup our data structures.
7481 		 */
7482 		if (target != CAM_TARGET_WILDCARD && tstate == NULL) {
7483 			tstate = ahc_alloc_tstate(ahc, target, channel);
7484 			if (tstate == NULL) {
7485 				xpt_print_path(ccb->ccb_h.path);
7486 				printk("Couldn't allocate tstate\n");
7487 				ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
7488 				return;
7489 			}
7490 		}
7491 		lstate = kzalloc(sizeof(*lstate), GFP_ATOMIC);
7492 		if (lstate == NULL) {
7493 			xpt_print_path(ccb->ccb_h.path);
7494 			printk("Couldn't allocate lstate\n");
7495 			ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
7496 			return;
7497 		}
7498 		status = xpt_create_path(&lstate->path, /*periph*/NULL,
7499 					 xpt_path_path_id(ccb->ccb_h.path),
7500 					 xpt_path_target_id(ccb->ccb_h.path),
7501 					 xpt_path_lun_id(ccb->ccb_h.path));
7502 		if (status != CAM_REQ_CMP) {
7503 			kfree(lstate);
7504 			xpt_print_path(ccb->ccb_h.path);
7505 			printk("Couldn't allocate path\n");
7506 			ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
7507 			return;
7508 		}
7509 		SLIST_INIT(&lstate->accept_tios);
7510 		SLIST_INIT(&lstate->immed_notifies);
7511 		ahc_lock(ahc, &s);
7512 		ahc_pause(ahc);
7513 		if (target != CAM_TARGET_WILDCARD) {
7514 			tstate->enabled_luns[lun] = lstate;
7515 			ahc->enabled_luns++;
7516 
7517 			if ((ahc->features & AHC_MULTI_TID) != 0) {
7518 				u_int targid_mask;
7519 
7520 				targid_mask = ahc_inb(ahc, TARGID)
7521 					    | (ahc_inb(ahc, TARGID + 1) << 8);
7522 
7523 				targid_mask |= target_mask;
7524 				ahc_outb(ahc, TARGID, targid_mask);
7525 				ahc_outb(ahc, TARGID+1, (targid_mask >> 8));
7526 				ahc_update_scsiid(ahc, targid_mask);
7527 			} else {
7528 				u_int our_id;
7529 				char  channel;
7530 
7531 				channel = SIM_CHANNEL(ahc, sim);
7532 				our_id = SIM_SCSI_ID(ahc, sim);
7533 
7534 				/*
7535 				 * This can only happen if selections
7536 				 * are not enabled
7537 				 */
7538 				if (target != our_id) {
7539 					u_int sblkctl;
7540 					char  cur_channel;
7541 					int   swap;
7542 
7543 					sblkctl = ahc_inb(ahc, SBLKCTL);
7544 					cur_channel = (sblkctl & SELBUSB)
7545 						    ? 'B' : 'A';
7546 					if ((ahc->features & AHC_TWIN) == 0)
7547 						cur_channel = 'A';
7548 					swap = cur_channel != channel;
7549 					if (channel == 'A')
7550 						ahc->our_id = target;
7551 					else
7552 						ahc->our_id_b = target;
7553 
7554 					if (swap)
7555 						ahc_outb(ahc, SBLKCTL,
7556 							 sblkctl ^ SELBUSB);
7557 
7558 					ahc_outb(ahc, SCSIID, target);
7559 
7560 					if (swap)
7561 						ahc_outb(ahc, SBLKCTL, sblkctl);
7562 				}
7563 			}
7564 		} else
7565 			ahc->black_hole = lstate;
7566 		/* Allow select-in operations */
7567 		if (ahc->black_hole != NULL && ahc->enabled_luns > 0) {
7568 			scsiseq = ahc_inb(ahc, SCSISEQ_TEMPLATE);
7569 			scsiseq |= ENSELI;
7570 			ahc_outb(ahc, SCSISEQ_TEMPLATE, scsiseq);
7571 			scsiseq = ahc_inb(ahc, SCSISEQ);
7572 			scsiseq |= ENSELI;
7573 			ahc_outb(ahc, SCSISEQ, scsiseq);
7574 		}
7575 		ahc_unpause(ahc);
7576 		ahc_unlock(ahc, &s);
7577 		ccb->ccb_h.status = CAM_REQ_CMP;
7578 		xpt_print_path(ccb->ccb_h.path);
7579 		printk("Lun now enabled for target mode\n");
7580 	} else {
7581 		struct scb *scb;
7582 		int i, empty;
7583 
7584 		if (lstate == NULL) {
7585 			ccb->ccb_h.status = CAM_LUN_INVALID;
7586 			return;
7587 		}
7588 
7589 		ahc_lock(ahc, &s);
7590 
7591 		ccb->ccb_h.status = CAM_REQ_CMP;
7592 		LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) {
7593 			struct ccb_hdr *ccbh;
7594 
7595 			ccbh = &scb->io_ctx->ccb_h;
7596 			if (ccbh->func_code == XPT_CONT_TARGET_IO
7597 			 && !xpt_path_comp(ccbh->path, ccb->ccb_h.path)){
7598 				printk("CTIO pending\n");
7599 				ccb->ccb_h.status = CAM_REQ_INVALID;
7600 				ahc_unlock(ahc, &s);
7601 				return;
7602 			}
7603 		}
7604 
7605 		if (SLIST_FIRST(&lstate->accept_tios) != NULL) {
7606 			printk("ATIOs pending\n");
7607 			ccb->ccb_h.status = CAM_REQ_INVALID;
7608 		}
7609 
7610 		if (SLIST_FIRST(&lstate->immed_notifies) != NULL) {
7611 			printk("INOTs pending\n");
7612 			ccb->ccb_h.status = CAM_REQ_INVALID;
7613 		}
7614 
7615 		if (ccb->ccb_h.status != CAM_REQ_CMP) {
7616 			ahc_unlock(ahc, &s);
7617 			return;
7618 		}
7619 
7620 		xpt_print_path(ccb->ccb_h.path);
7621 		printk("Target mode disabled\n");
7622 		xpt_free_path(lstate->path);
7623 		kfree(lstate);
7624 
7625 		ahc_pause(ahc);
7626 		/* Can we clean up the target too? */
7627 		if (target != CAM_TARGET_WILDCARD) {
7628 			tstate->enabled_luns[lun] = NULL;
7629 			ahc->enabled_luns--;
7630 			for (empty = 1, i = 0; i < 8; i++)
7631 				if (tstate->enabled_luns[i] != NULL) {
7632 					empty = 0;
7633 					break;
7634 				}
7635 
7636 			if (empty) {
7637 				ahc_free_tstate(ahc, target, channel,
7638 						/*force*/FALSE);
7639 				if (ahc->features & AHC_MULTI_TID) {
7640 					u_int targid_mask;
7641 
7642 					targid_mask = ahc_inb(ahc, TARGID)
7643 						    | (ahc_inb(ahc, TARGID + 1)
7644 						       << 8);
7645 
7646 					targid_mask &= ~target_mask;
7647 					ahc_outb(ahc, TARGID, targid_mask);
7648 					ahc_outb(ahc, TARGID+1,
7649 						 (targid_mask >> 8));
7650 					ahc_update_scsiid(ahc, targid_mask);
7651 				}
7652 			}
7653 		} else {
7654 
7655 			ahc->black_hole = NULL;
7656 
7657 			/*
7658 			 * We can't allow selections without
7659 			 * our black hole device.
7660 			 */
7661 			empty = TRUE;
7662 		}
7663 		if (ahc->enabled_luns == 0) {
7664 			/* Disallow select-in */
7665 			u_int scsiseq;
7666 
7667 			scsiseq = ahc_inb(ahc, SCSISEQ_TEMPLATE);
7668 			scsiseq &= ~ENSELI;
7669 			ahc_outb(ahc, SCSISEQ_TEMPLATE, scsiseq);
7670 			scsiseq = ahc_inb(ahc, SCSISEQ);
7671 			scsiseq &= ~ENSELI;
7672 			ahc_outb(ahc, SCSISEQ, scsiseq);
7673 
7674 			if ((ahc->features & AHC_MULTIROLE) == 0) {
7675 				printk("Configuring Initiator Mode\n");
7676 				ahc->flags &= ~AHC_TARGETROLE;
7677 				ahc->flags |= AHC_INITIATORROLE;
7678 				/*
7679 				 * Returning to a configuration that
7680 				 * fit previously will always succeed.
7681 				 */
7682 				(void)ahc_loadseq(ahc);
7683 				ahc_restart(ahc);
7684 				/*
7685 				 * Unpaused.  The extra unpause
7686 				 * that follows is harmless.
7687 				 */
7688 			}
7689 		}
7690 		ahc_unpause(ahc);
7691 		ahc_unlock(ahc, &s);
7692 	}
7693 }
7694 
7695 static void
7696 ahc_update_scsiid(struct ahc_softc *ahc, u_int targid_mask)
7697 {
7698 	u_int scsiid_mask;
7699 	u_int scsiid;
7700 
7701 	if ((ahc->features & AHC_MULTI_TID) == 0)
7702 		panic("ahc_update_scsiid called on non-multitid unit\n");
7703 
7704 	/*
7705 	 * Since we will rely on the TARGID mask
7706 	 * for selection enables, ensure that OID
7707 	 * in SCSIID is not set to some other ID
7708 	 * that we don't want to allow selections on.
7709 	 */
7710 	if ((ahc->features & AHC_ULTRA2) != 0)
7711 		scsiid = ahc_inb(ahc, SCSIID_ULTRA2);
7712 	else
7713 		scsiid = ahc_inb(ahc, SCSIID);
7714 	scsiid_mask = 0x1 << (scsiid & OID);
7715 	if ((targid_mask & scsiid_mask) == 0) {
7716 		u_int our_id;
7717 
7718 		/* ffs counts from 1 */
7719 		our_id = ffs(targid_mask);
7720 		if (our_id == 0)
7721 			our_id = ahc->our_id;
7722 		else
7723 			our_id--;
7724 		scsiid &= TID;
7725 		scsiid |= our_id;
7726 	}
7727 	if ((ahc->features & AHC_ULTRA2) != 0)
7728 		ahc_outb(ahc, SCSIID_ULTRA2, scsiid);
7729 	else
7730 		ahc_outb(ahc, SCSIID, scsiid);
7731 }
7732 
7733 static void
7734 ahc_run_tqinfifo(struct ahc_softc *ahc, int paused)
7735 {
7736 	struct target_cmd *cmd;
7737 
7738 	/*
7739 	 * If the card supports auto-access pause,
7740 	 * we can access the card directly regardless
7741 	 * of whether it is paused or not.
7742 	 */
7743 	if ((ahc->features & AHC_AUTOPAUSE) != 0)
7744 		paused = TRUE;
7745 
7746 	ahc_sync_tqinfifo(ahc, BUS_DMASYNC_POSTREAD);
7747 	while ((cmd = &ahc->targetcmds[ahc->tqinfifonext])->cmd_valid != 0) {
7748 
7749 		/*
7750 		 * Only advance through the queue if we
7751 		 * have the resources to process the command.
7752 		 */
7753 		if (ahc_handle_target_cmd(ahc, cmd) != 0)
7754 			break;
7755 
7756 		cmd->cmd_valid = 0;
7757 		ahc_dmamap_sync(ahc, ahc->shared_data_dmat,
7758 				ahc->shared_data_dmamap,
7759 				ahc_targetcmd_offset(ahc, ahc->tqinfifonext),
7760 				sizeof(struct target_cmd),
7761 				BUS_DMASYNC_PREREAD);
7762 		ahc->tqinfifonext++;
7763 
7764 		/*
7765 		 * Lazily update our position in the target mode incoming
7766 		 * command queue as seen by the sequencer.
7767 		 */
7768 		if ((ahc->tqinfifonext & (HOST_TQINPOS - 1)) == 1) {
7769 			if ((ahc->features & AHC_HS_MAILBOX) != 0) {
7770 				u_int hs_mailbox;
7771 
7772 				hs_mailbox = ahc_inb(ahc, HS_MAILBOX);
7773 				hs_mailbox &= ~HOST_TQINPOS;
7774 				hs_mailbox |= ahc->tqinfifonext & HOST_TQINPOS;
7775 				ahc_outb(ahc, HS_MAILBOX, hs_mailbox);
7776 			} else {
7777 				if (!paused)
7778 					ahc_pause(ahc);
7779 				ahc_outb(ahc, KERNEL_TQINPOS,
7780 					 ahc->tqinfifonext & HOST_TQINPOS);
7781 				if (!paused)
7782 					ahc_unpause(ahc);
7783 			}
7784 		}
7785 	}
7786 }
7787 
7788 static int
7789 ahc_handle_target_cmd(struct ahc_softc *ahc, struct target_cmd *cmd)
7790 {
7791 	struct	  ahc_tmode_tstate *tstate;
7792 	struct	  ahc_tmode_lstate *lstate;
7793 	struct	  ccb_accept_tio *atio;
7794 	uint8_t *byte;
7795 	int	  initiator;
7796 	int	  target;
7797 	int	  lun;
7798 
7799 	initiator = SCSIID_TARGET(ahc, cmd->scsiid);
7800 	target = SCSIID_OUR_ID(cmd->scsiid);
7801 	lun    = (cmd->identify & MSG_IDENTIFY_LUNMASK);
7802 
7803 	byte = cmd->bytes;
7804 	tstate = ahc->enabled_targets[target];
7805 	lstate = NULL;
7806 	if (tstate != NULL)
7807 		lstate = tstate->enabled_luns[lun];
7808 
7809 	/*
7810 	 * Commands for disabled luns go to the black hole driver.
7811 	 */
7812 	if (lstate == NULL)
7813 		lstate = ahc->black_hole;
7814 
7815 	atio = (struct ccb_accept_tio*)SLIST_FIRST(&lstate->accept_tios);
7816 	if (atio == NULL) {
7817 		ahc->flags |= AHC_TQINFIFO_BLOCKED;
7818 		/*
7819 		 * Wait for more ATIOs from the peripheral driver for this lun.
7820 		 */
7821 		if (bootverbose)
7822 			printk("%s: ATIOs exhausted\n", ahc_name(ahc));
7823 		return (1);
7824 	} else
7825 		ahc->flags &= ~AHC_TQINFIFO_BLOCKED;
7826 #if 0
7827 	printk("Incoming command from %d for %d:%d%s\n",
7828 	       initiator, target, lun,
7829 	       lstate == ahc->black_hole ? "(Black Holed)" : "");
7830 #endif
7831 	SLIST_REMOVE_HEAD(&lstate->accept_tios, sim_links.sle);
7832 
7833 	if (lstate == ahc->black_hole) {
7834 		/* Fill in the wildcards */
7835 		atio->ccb_h.target_id = target;
7836 		atio->ccb_h.target_lun = lun;
7837 	}
7838 
7839 	/*
7840 	 * Package it up and send it off to
7841 	 * whomever has this lun enabled.
7842 	 */
7843 	atio->sense_len = 0;
7844 	atio->init_id = initiator;
7845 	if (byte[0] != 0xFF) {
7846 		/* Tag was included */
7847 		atio->tag_action = *byte++;
7848 		atio->tag_id = *byte++;
7849 		atio->ccb_h.flags = CAM_TAG_ACTION_VALID;
7850 	} else {
7851 		atio->ccb_h.flags = 0;
7852 	}
7853 	byte++;
7854 
7855 	/* Okay.  Now determine the cdb size based on the command code */
7856 	switch (*byte >> CMD_GROUP_CODE_SHIFT) {
7857 	case 0:
7858 		atio->cdb_len = 6;
7859 		break;
7860 	case 1:
7861 	case 2:
7862 		atio->cdb_len = 10;
7863 		break;
7864 	case 4:
7865 		atio->cdb_len = 16;
7866 		break;
7867 	case 5:
7868 		atio->cdb_len = 12;
7869 		break;
7870 	case 3:
7871 	default:
7872 		/* Only copy the opcode. */
7873 		atio->cdb_len = 1;
7874 		printk("Reserved or VU command code type encountered\n");
7875 		break;
7876 	}
7877 
7878 	memcpy(atio->cdb_io.cdb_bytes, byte, atio->cdb_len);
7879 
7880 	atio->ccb_h.status |= CAM_CDB_RECVD;
7881 
7882 	if ((cmd->identify & MSG_IDENTIFY_DISCFLAG) == 0) {
7883 		/*
7884 		 * We weren't allowed to disconnect.
7885 		 * We're hanging on the bus until a
7886 		 * continue target I/O comes in response
7887 		 * to this accept tio.
7888 		 */
7889 #if 0
7890 		printk("Received Immediate Command %d:%d:%d - %p\n",
7891 		       initiator, target, lun, ahc->pending_device);
7892 #endif
7893 		ahc->pending_device = lstate;
7894 		ahc_freeze_ccb((union ccb *)atio);
7895 		atio->ccb_h.flags |= CAM_DIS_DISCONNECT;
7896 	}
7897 	xpt_done((union ccb*)atio);
7898 	return (0);
7899 }
7900 
7901 #endif
7902