1 
2 /*
3  * Adaptec AIC7xxx device driver for Linux.
4  *
5  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
6  *
7  * Copyright (c) 1994 John Aycock
8  *   The University of Calgary Department of Computer Science.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2, or (at your option)
13  * any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; see the file COPYING.  If not, write to
22  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23  *
24  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
25  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
26  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
27  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
28  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
29  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
30  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
31  * ANSI SCSI-2 specification (draft 10c), ...
32  *
33  * --------------------------------------------------------------------------
34  *
35  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
36  *
37  *  Substantially modified to include support for wide and twin bus
38  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
39  *  SCB paging, and other rework of the code.
40  *
41  * --------------------------------------------------------------------------
42  * Copyright (c) 1994-2000 Justin T. Gibbs.
43  * Copyright (c) 2000-2001 Adaptec Inc.
44  * All rights reserved.
45  *
46  * Redistribution and use in source and binary forms, with or without
47  * modification, are permitted provided that the following conditions
48  * are met:
49  * 1. Redistributions of source code must retain the above copyright
50  *    notice, this list of conditions, and the following disclaimer,
51  *    without modification.
52  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
53  *    substantially similar to the "NO WARRANTY" disclaimer below
54  *    ("Disclaimer") and any redistribution must be conditioned upon
55  *    including a substantially similar Disclaimer requirement for further
56  *    binary redistribution.
57  * 3. Neither the names of the above-listed copyright holders nor the names
58  *    of any contributors may be used to endorse or promote products derived
59  *    from this software without specific prior written permission.
60  *
61  * Alternatively, this software may be distributed under the terms of the
62  * GNU General Public License ("GPL") version 2 as published by the Free
63  * Software Foundation.
64  *
65  * NO WARRANTY
66  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
67  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
68  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
69  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
70  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
71  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
72  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
73  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
74  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
75  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
76  * POSSIBILITY OF SUCH DAMAGES.
77  *
78  *---------------------------------------------------------------------------
79  *
80  *  Thanks also go to (in alphabetical order) the following:
81  *
82  *    Rory Bolt     - Sequencer bug fixes
83  *    Jay Estabrook - Initial DEC Alpha support
84  *    Doug Ledford  - Much needed abort/reset bug fixes
85  *    Kai Makisara  - DMAing of SCBs
86  *
87  *  A Boot time option was also added for not resetting the scsi bus.
88  *
89  *    Form:  aic7xxx=extended
90  *           aic7xxx=no_reset
91  *           aic7xxx=verbose
92  *
93  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
94  *
95  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
96  */
97 
98 /*
99  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
100  *
101  * Copyright (c) 1997-1999 Doug Ledford
102  *
103  * These changes are released under the same licensing terms as the FreeBSD
104  * driver written by Justin Gibbs.  Please see his Copyright notice above
105  * for the exact terms and conditions covering my changes as well as the
106  * warranty statement.
107  *
108  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
109  * but are not limited to:
110  *
111  *  1: Import of the latest FreeBSD sequencer code for this driver
112  *  2: Modification of kernel code to accommodate different sequencer semantics
113  *  3: Extensive changes throughout kernel portion of driver to improve
114  *     abort/reset processing and error hanndling
115  *  4: Other work contributed by various people on the Internet
116  *  5: Changes to printk information and verbosity selection code
117  *  6: General reliability related changes, especially in IRQ management
118  *  7: Modifications to the default probe/attach order for supported cards
119  *  8: SMP friendliness has been improved
120  *
121  */
122 
123 #include "aic7xxx_osm.h"
124 #include "aic7xxx_inline.h"
125 #include <scsi/scsicam.h>
126 
127 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
128 
129 #include <linux/init.h>		/* __setup */
130 #include <linux/mm.h>		/* For fetching system memory size */
131 #include <linux/blkdev.h>		/* For block_size() */
132 #include <linux/delay.h>	/* For ssleep/msleep */
133 #include <linux/slab.h>
134 
135 
136 /*
137  * Set this to the delay in seconds after SCSI bus reset.
138  * Note, we honor this only for the initial bus reset.
139  * The scsi error recovery code performs its own bus settle
140  * delay handling for error recovery actions.
141  */
142 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
143 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
144 #else
145 #define AIC7XXX_RESET_DELAY 5000
146 #endif
147 
148 /*
149  * To change the default number of tagged transactions allowed per-device,
150  * add a line to the lilo.conf file like:
151  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
152  * which will result in the first four devices on the first two
153  * controllers being set to a tagged queue depth of 32.
154  *
155  * The tag_commands is an array of 16 to allow for wide and twin adapters.
156  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
157  * for channel 1.
158  */
159 typedef struct {
160 	uint8_t tag_commands[16];	/* Allow for wide/twin adapters. */
161 } adapter_tag_info_t;
162 
163 /*
164  * Modify this as you see fit for your system.
165  *
166  * 0			tagged queuing disabled
167  * 1 <= n <= 253	n == max tags ever dispatched.
168  *
169  * The driver will throttle the number of commands dispatched to a
170  * device if it returns queue full.  For devices with a fixed maximum
171  * queue depth, the driver will eventually determine this depth and
172  * lock it in (a console message is printed to indicate that a lock
173  * has occurred).  On some devices, queue full is returned for a temporary
174  * resource shortage.  These devices will return queue full at varying
175  * depths.  The driver will throttle back when the queue fulls occur and
176  * attempt to slowly increase the depth over time as the device recovers
177  * from the resource shortage.
178  *
179  * In this example, the first line will disable tagged queueing for all
180  * the devices on the first probed aic7xxx adapter.
181  *
182  * The second line enables tagged queueing with 4 commands/LUN for IDs
183  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
184  * driver to attempt to use up to 64 tags for ID 1.
185  *
186  * The third line is the same as the first line.
187  *
188  * The fourth line disables tagged queueing for devices 0 and 3.  It
189  * enables tagged queueing for the other IDs, with 16 commands/LUN
190  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
191  * IDs 2, 5-7, and 9-15.
192  */
193 
194 /*
195  * NOTE: The below structure is for reference only, the actual structure
196  *       to modify in order to change things is just below this comment block.
197 adapter_tag_info_t aic7xxx_tag_info[] =
198 {
199 	{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
200 	{{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
201 	{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
202 	{{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
203 };
204 */
205 
206 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
207 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
208 #else
209 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
210 #endif
211 
212 #define AIC7XXX_CONFIGED_TAG_COMMANDS {					\
213 	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
214 	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
215 	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
216 	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
217 	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
218 	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
219 	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
220 	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE		\
221 }
222 
223 /*
224  * By default, use the number of commands specified by
225  * the users kernel configuration.
226  */
227 static adapter_tag_info_t aic7xxx_tag_info[] =
228 {
229 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
230 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
231 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
232 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
233 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
234 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
235 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
236 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
237 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
238 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
239 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
240 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
241 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
242 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
243 	{AIC7XXX_CONFIGED_TAG_COMMANDS},
244 	{AIC7XXX_CONFIGED_TAG_COMMANDS}
245 };
246 
247 /*
248  * There should be a specific return value for this in scsi.h, but
249  * it seems that most drivers ignore it.
250  */
251 #define DID_UNDERFLOW   DID_ERROR
252 
253 void
254 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
255 {
256 	printk("(scsi%d:%c:%d:%d): ",
257 	       ahc->platform_data->host->host_no,
258 	       scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
259 	       scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
260 	       scb != NULL ? SCB_GET_LUN(scb) : -1);
261 }
262 
263 /*
264  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
265  *       cards in the system.  This should be fixed.  Exceptions to this
266  *       rule are noted in the comments.
267  */
268 
269 /*
270  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
271  * has no effect on any later resets that might occur due to things like
272  * SCSI bus timeouts.
273  */
274 static uint32_t aic7xxx_no_reset;
275 
276 /*
277  * Should we force EXTENDED translation on a controller.
278  *     0 == Use whatever is in the SEEPROM or default to off
279  *     1 == Use whatever is in the SEEPROM or default to on
280  */
281 static uint32_t aic7xxx_extended;
282 
283 /*
284  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
285  * dubious at best.  To my knowledge, this option has never actually
286  * solved a PCI parity problem, but on certain machines with broken PCI
287  * chipset configurations where stray PCI transactions with bad parity are
288  * the norm rather than the exception, the error messages can be overwhelming.
289  * It's included in the driver for completeness.
290  *   0	   = Shut off PCI parity check
291  *   non-0 = reverse polarity pci parity checking
292  */
293 static uint32_t aic7xxx_pci_parity = ~0;
294 
295 /*
296  * There are lots of broken chipsets in the world.  Some of them will
297  * violate the PCI spec when we issue byte sized memory writes to our
298  * controller.  I/O mapped register access, if allowed by the given
299  * platform, will work in almost all cases.
300  */
301 uint32_t aic7xxx_allow_memio = ~0;
302 
303 /*
304  * So that we can set how long each device is given as a selection timeout.
305  * The table of values goes like this:
306  *   0 - 256ms
307  *   1 - 128ms
308  *   2 - 64ms
309  *   3 - 32ms
310  * We default to 256ms because some older devices need a longer time
311  * to respond to initial selection.
312  */
313 static uint32_t aic7xxx_seltime;
314 
315 /*
316  * Certain devices do not perform any aging on commands.  Should the
317  * device be saturated by commands in one portion of the disk, it is
318  * possible for transactions on far away sectors to never be serviced.
319  * To handle these devices, we can periodically send an ordered tag to
320  * force all outstanding transactions to be serviced prior to a new
321  * transaction.
322  */
323 static uint32_t aic7xxx_periodic_otag;
324 
325 /*
326  * Module information and settable options.
327  */
328 static char *aic7xxx = NULL;
329 
330 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
331 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
332 MODULE_LICENSE("Dual BSD/GPL");
333 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
334 module_param(aic7xxx, charp, 0444);
335 MODULE_PARM_DESC(aic7xxx,
336 "period-delimited options string:\n"
337 "	verbose			Enable verbose/diagnostic logging\n"
338 "	allow_memio		Allow device registers to be memory mapped\n"
339 "	debug			Bitmask of debug values to enable\n"
340 "	no_probe		Toggle EISA/VLB controller probing\n"
341 "	probe_eisa_vl		Toggle EISA/VLB controller probing\n"
342 "	no_reset		Suppress initial bus resets\n"
343 "	extended		Enable extended geometry on all controllers\n"
344 "	periodic_otag		Send an ordered tagged transaction\n"
345 "				periodically to prevent tag starvation.\n"
346 "				This may be required by some older disk\n"
347 "				drives or RAID arrays.\n"
348 "	tag_info:<tag_str>	Set per-target tag depth\n"
349 "	global_tag_depth:<int>	Global tag depth for every target\n"
350 "				on every bus\n"
351 "	seltime:<int>		Selection Timeout\n"
352 "				(0/256ms,1/128ms,2/64ms,3/32ms)\n"
353 "\n"
354 "	Sample modprobe configuration file:\n"
355 "	#	Toggle EISA/VLB probing\n"
356 "	#	Set tag depth on Controller 1/Target 1 to 10 tags\n"
357 "	#	Shorten the selection timeout to 128ms\n"
358 "\n"
359 "	options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
360 );
361 
362 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
363 					 struct scsi_device *,
364 					 struct scb *);
365 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
366 					 struct scsi_cmnd *cmd);
367 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
368 static void ahc_linux_release_simq(struct ahc_softc *ahc);
369 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
370 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
371 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
372 				     struct ahc_devinfo *devinfo);
373 static void ahc_linux_device_queue_depth(struct scsi_device *);
374 static int ahc_linux_run_command(struct ahc_softc*,
375 				 struct ahc_linux_device *,
376 				 struct scsi_cmnd *);
377 static void ahc_linux_setup_tag_info_global(char *p);
378 static int  aic7xxx_setup(char *s);
379 
380 static int ahc_linux_unit;
381 
382 
383 /************************** OS Utility Wrappers *******************************/
384 void
385 ahc_delay(long usec)
386 {
387 	/*
388 	 * udelay on Linux can have problems for
389 	 * multi-millisecond waits.  Wait at most
390 	 * 1024us per call.
391 	 */
392 	while (usec > 0) {
393 		udelay(usec % 1024);
394 		usec -= 1024;
395 	}
396 }
397 
398 /***************************** Low Level I/O **********************************/
399 uint8_t
400 ahc_inb(struct ahc_softc * ahc, long port)
401 {
402 	uint8_t x;
403 
404 	if (ahc->tag == BUS_SPACE_MEMIO) {
405 		x = readb(ahc->bsh.maddr + port);
406 	} else {
407 		x = inb(ahc->bsh.ioport + port);
408 	}
409 	mb();
410 	return (x);
411 }
412 
413 void
414 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
415 {
416 	if (ahc->tag == BUS_SPACE_MEMIO) {
417 		writeb(val, ahc->bsh.maddr + port);
418 	} else {
419 		outb(val, ahc->bsh.ioport + port);
420 	}
421 	mb();
422 }
423 
424 void
425 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
426 {
427 	int i;
428 
429 	/*
430 	 * There is probably a more efficient way to do this on Linux
431 	 * but we don't use this for anything speed critical and this
432 	 * should work.
433 	 */
434 	for (i = 0; i < count; i++)
435 		ahc_outb(ahc, port, *array++);
436 }
437 
438 void
439 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
440 {
441 	int i;
442 
443 	/*
444 	 * There is probably a more efficient way to do this on Linux
445 	 * but we don't use this for anything speed critical and this
446 	 * should work.
447 	 */
448 	for (i = 0; i < count; i++)
449 		*array++ = ahc_inb(ahc, port);
450 }
451 
452 /********************************* Inlines ************************************/
453 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
454 
455 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
456 				      struct ahc_dma_seg *sg,
457 				      dma_addr_t addr, bus_size_t len);
458 
459 static void
460 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
461 {
462 	struct scsi_cmnd *cmd;
463 
464 	cmd = scb->io_ctx;
465 	ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
466 
467 	scsi_dma_unmap(cmd);
468 }
469 
470 static int
471 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
472 		  struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
473 {
474 	int	 consumed;
475 
476 	if ((scb->sg_count + 1) > AHC_NSEG)
477 		panic("Too few segs for dma mapping.  "
478 		      "Increase AHC_NSEG\n");
479 
480 	consumed = 1;
481 	sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
482 	scb->platform_data->xfer_len += len;
483 
484 	if (sizeof(dma_addr_t) > 4
485 	 && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
486 		len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
487 
488 	sg->len = ahc_htole32(len);
489 	return (consumed);
490 }
491 
492 /*
493  * Return a string describing the driver.
494  */
495 static const char *
496 ahc_linux_info(struct Scsi_Host *host)
497 {
498 	static char buffer[512];
499 	char	ahc_info[256];
500 	char   *bp;
501 	struct ahc_softc *ahc;
502 
503 	bp = &buffer[0];
504 	ahc = *(struct ahc_softc **)host->hostdata;
505 	memset(bp, 0, sizeof(buffer));
506 	strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
507 			"        <");
508 	strcat(bp, ahc->description);
509 	strcat(bp, ">\n"
510 			"        ");
511 	ahc_controller_info(ahc, ahc_info);
512 	strcat(bp, ahc_info);
513 	strcat(bp, "\n");
514 
515 	return (bp);
516 }
517 
518 /*
519  * Queue an SCB to the controller.
520  */
521 static int
522 ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
523 {
524 	struct	 ahc_softc *ahc;
525 	struct	 ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
526 	int rtn = SCSI_MLQUEUE_HOST_BUSY;
527 	unsigned long flags;
528 
529 	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
530 
531 	ahc_lock(ahc, &flags);
532 	if (ahc->platform_data->qfrozen == 0) {
533 		cmd->scsi_done = scsi_done;
534 		cmd->result = CAM_REQ_INPROG << 16;
535 		rtn = ahc_linux_run_command(ahc, dev, cmd);
536 	}
537 	ahc_unlock(ahc, &flags);
538 
539 	return rtn;
540 }
541 
542 static DEF_SCSI_QCMD(ahc_linux_queue)
543 
544 static inline struct scsi_target **
545 ahc_linux_target_in_softc(struct scsi_target *starget)
546 {
547 	struct	ahc_softc *ahc =
548 		*((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
549 	unsigned int target_offset;
550 
551 	target_offset = starget->id;
552 	if (starget->channel != 0)
553 		target_offset += 8;
554 
555 	return &ahc->platform_data->starget[target_offset];
556 }
557 
558 static int
559 ahc_linux_target_alloc(struct scsi_target *starget)
560 {
561 	struct	ahc_softc *ahc =
562 		*((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
563 	struct seeprom_config *sc = ahc->seep_config;
564 	unsigned long flags;
565 	struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
566 	unsigned short scsirate;
567 	struct ahc_devinfo devinfo;
568 	char channel = starget->channel + 'A';
569 	unsigned int our_id = ahc->our_id;
570 	unsigned int target_offset;
571 
572 	target_offset = starget->id;
573 	if (starget->channel != 0)
574 		target_offset += 8;
575 
576 	if (starget->channel)
577 		our_id = ahc->our_id_b;
578 
579 	ahc_lock(ahc, &flags);
580 
581 	BUG_ON(*ahc_targp != NULL);
582 
583 	*ahc_targp = starget;
584 
585 	if (sc) {
586 		int maxsync = AHC_SYNCRATE_DT;
587 		int ultra = 0;
588 		int flags = sc->device_flags[target_offset];
589 
590 		if (ahc->flags & AHC_NEWEEPROM_FMT) {
591 		    if (flags & CFSYNCHISULTRA)
592 			ultra = 1;
593 		} else if (flags & CFULTRAEN)
594 			ultra = 1;
595 		/* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
596 		 * change it to ultra=0, CFXFER = 0 */
597 		if(ultra && (flags & CFXFER) == 0x04) {
598 			ultra = 0;
599 			flags &= ~CFXFER;
600 		}
601 
602 		if ((ahc->features & AHC_ULTRA2) != 0) {
603 			scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
604 		} else {
605 			scsirate = (flags & CFXFER) << 4;
606 			maxsync = ultra ? AHC_SYNCRATE_ULTRA :
607 				AHC_SYNCRATE_FAST;
608 		}
609 		spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
610 		if (!(flags & CFSYNCH))
611 			spi_max_offset(starget) = 0;
612 		spi_min_period(starget) =
613 			ahc_find_period(ahc, scsirate, maxsync);
614 	}
615 	ahc_compile_devinfo(&devinfo, our_id, starget->id,
616 			    CAM_LUN_WILDCARD, channel,
617 			    ROLE_INITIATOR);
618 	ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
619 			 AHC_TRANS_GOAL, /*paused*/FALSE);
620 	ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
621 		      AHC_TRANS_GOAL, /*paused*/FALSE);
622 	ahc_unlock(ahc, &flags);
623 
624 	return 0;
625 }
626 
627 static void
628 ahc_linux_target_destroy(struct scsi_target *starget)
629 {
630 	struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
631 
632 	*ahc_targp = NULL;
633 }
634 
635 static int
636 ahc_linux_slave_alloc(struct scsi_device *sdev)
637 {
638 	struct	ahc_softc *ahc =
639 		*((struct ahc_softc **)sdev->host->hostdata);
640 	struct scsi_target *starget = sdev->sdev_target;
641 	struct ahc_linux_device *dev;
642 
643 	if (bootverbose)
644 		printk("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
645 
646 	dev = scsi_transport_device_data(sdev);
647 	memset(dev, 0, sizeof(*dev));
648 
649 	/*
650 	 * We start out life using untagged
651 	 * transactions of which we allow one.
652 	 */
653 	dev->openings = 1;
654 
655 	/*
656 	 * Set maxtags to 0.  This will be changed if we
657 	 * later determine that we are dealing with
658 	 * a tagged queuing capable device.
659 	 */
660 	dev->maxtags = 0;
661 
662 	spi_period(starget) = 0;
663 
664 	return 0;
665 }
666 
667 static int
668 ahc_linux_slave_configure(struct scsi_device *sdev)
669 {
670 	if (bootverbose)
671 		sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
672 
673 	ahc_linux_device_queue_depth(sdev);
674 
675 	/* Initial Domain Validation */
676 	if (!spi_initial_dv(sdev->sdev_target))
677 		spi_dv_device(sdev);
678 
679 	return 0;
680 }
681 
682 #if defined(__i386__)
683 /*
684  * Return the disk geometry for the given SCSI device.
685  */
686 static int
687 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
688 		    sector_t capacity, int geom[])
689 {
690 	int	 heads;
691 	int	 sectors;
692 	int	 cylinders;
693 	int	 extended;
694 	struct	 ahc_softc *ahc;
695 	u_int	 channel;
696 
697 	ahc = *((struct ahc_softc **)sdev->host->hostdata);
698 	channel = sdev_channel(sdev);
699 
700 	if (scsi_partsize(bdev, capacity, geom))
701 		return 0;
702 
703 	heads = 64;
704 	sectors = 32;
705 	cylinders = aic_sector_div(capacity, heads, sectors);
706 
707 	if (aic7xxx_extended != 0)
708 		extended = 1;
709 	else if (channel == 0)
710 		extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
711 	else
712 		extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
713 	if (extended && cylinders >= 1024) {
714 		heads = 255;
715 		sectors = 63;
716 		cylinders = aic_sector_div(capacity, heads, sectors);
717 	}
718 	geom[0] = heads;
719 	geom[1] = sectors;
720 	geom[2] = cylinders;
721 	return (0);
722 }
723 #endif
724 
725 /*
726  * Abort the current SCSI command(s).
727  */
728 static int
729 ahc_linux_abort(struct scsi_cmnd *cmd)
730 {
731 	int error;
732 
733 	error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
734 	if (error != SUCCESS)
735 		printk("aic7xxx_abort returns 0x%x\n", error);
736 	return (error);
737 }
738 
739 /*
740  * Attempt to send a target reset message to the device that timed out.
741  */
742 static int
743 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
744 {
745 	int error;
746 
747 	error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
748 	if (error != SUCCESS)
749 		printk("aic7xxx_dev_reset returns 0x%x\n", error);
750 	return (error);
751 }
752 
753 /*
754  * Reset the SCSI bus.
755  */
756 static int
757 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
758 {
759 	struct ahc_softc *ahc;
760 	int    found;
761 	unsigned long flags;
762 
763 	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
764 
765 	ahc_lock(ahc, &flags);
766 	found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
767 				  /*initiate reset*/TRUE);
768 	ahc_unlock(ahc, &flags);
769 
770 	if (bootverbose)
771 		printk("%s: SCSI bus reset delivered. "
772 		       "%d SCBs aborted.\n", ahc_name(ahc), found);
773 
774 	return SUCCESS;
775 }
776 
777 struct scsi_host_template aic7xxx_driver_template = {
778 	.module			= THIS_MODULE,
779 	.name			= "aic7xxx",
780 	.proc_name		= "aic7xxx",
781 	.show_info		= ahc_linux_show_info,
782 	.write_info		= ahc_proc_write_seeprom,
783 	.info			= ahc_linux_info,
784 	.queuecommand		= ahc_linux_queue,
785 	.eh_abort_handler	= ahc_linux_abort,
786 	.eh_device_reset_handler = ahc_linux_dev_reset,
787 	.eh_bus_reset_handler	= ahc_linux_bus_reset,
788 #if defined(__i386__)
789 	.bios_param		= ahc_linux_biosparam,
790 #endif
791 	.can_queue		= AHC_MAX_QUEUE,
792 	.this_id		= -1,
793 	.max_sectors		= 8192,
794 	.cmd_per_lun		= 2,
795 	.slave_alloc		= ahc_linux_slave_alloc,
796 	.slave_configure	= ahc_linux_slave_configure,
797 	.target_alloc		= ahc_linux_target_alloc,
798 	.target_destroy		= ahc_linux_target_destroy,
799 };
800 
801 /**************************** Tasklet Handler *********************************/
802 
803 /******************************** Macros **************************************/
804 #define BUILD_SCSIID(ahc, cmd)						    \
805 	((((cmd)->device->id << TID_SHIFT) & TID)			    \
806 	| (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
807 	| (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
808 
809 /******************************** Bus DMA *************************************/
810 int
811 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
812 		   bus_size_t alignment, bus_size_t boundary,
813 		   dma_addr_t lowaddr, dma_addr_t highaddr,
814 		   bus_dma_filter_t *filter, void *filterarg,
815 		   bus_size_t maxsize, int nsegments,
816 		   bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
817 {
818 	bus_dma_tag_t dmat;
819 
820 	dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
821 	if (dmat == NULL)
822 		return (ENOMEM);
823 
824 	/*
825 	 * Linux is very simplistic about DMA memory.  For now don't
826 	 * maintain all specification information.  Once Linux supplies
827 	 * better facilities for doing these operations, or the
828 	 * needs of this particular driver change, we might need to do
829 	 * more here.
830 	 */
831 	dmat->alignment = alignment;
832 	dmat->boundary = boundary;
833 	dmat->maxsize = maxsize;
834 	*ret_tag = dmat;
835 	return (0);
836 }
837 
838 void
839 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
840 {
841 	kfree(dmat);
842 }
843 
844 int
845 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
846 		 int flags, bus_dmamap_t *mapp)
847 {
848 	/* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
849 	*vaddr = dma_alloc_coherent(ahc->dev, dmat->maxsize, mapp, GFP_ATOMIC);
850 	if (*vaddr == NULL)
851 		return ENOMEM;
852 	return 0;
853 }
854 
855 void
856 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
857 		void* vaddr, bus_dmamap_t map)
858 {
859 	dma_free_coherent(ahc->dev, dmat->maxsize, vaddr, map);
860 }
861 
862 int
863 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
864 		void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
865 		void *cb_arg, int flags)
866 {
867 	/*
868 	 * Assume for now that this will only be used during
869 	 * initialization and not for per-transaction buffer mapping.
870 	 */
871 	bus_dma_segment_t stack_sg;
872 
873 	stack_sg.ds_addr = map;
874 	stack_sg.ds_len = dmat->maxsize;
875 	cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
876 	return (0);
877 }
878 
879 void
880 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
881 {
882 }
883 
884 int
885 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
886 {
887 	/* Nothing to do */
888 	return (0);
889 }
890 
891 static void
892 ahc_linux_setup_tag_info_global(char *p)
893 {
894 	int tags, i, j;
895 
896 	tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
897 	printk("Setting Global Tags= %d\n", tags);
898 
899 	for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
900 		for (j = 0; j < AHC_NUM_TARGETS; j++) {
901 			aic7xxx_tag_info[i].tag_commands[j] = tags;
902 		}
903 	}
904 }
905 
906 static void
907 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
908 {
909 
910 	if ((instance >= 0) && (targ >= 0)
911 	 && (instance < ARRAY_SIZE(aic7xxx_tag_info))
912 	 && (targ < AHC_NUM_TARGETS)) {
913 		aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
914 		if (bootverbose)
915 			printk("tag_info[%d:%d] = %d\n", instance, targ, value);
916 	}
917 }
918 
919 static char *
920 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
921 		       void (*callback)(u_long, int, int, int32_t),
922 		       u_long callback_arg)
923 {
924 	char	*tok_end;
925 	char	*tok_end2;
926 	int      i;
927 	int      instance;
928 	int	 targ;
929 	int	 done;
930 	char	 tok_list[] = {'.', ',', '{', '}', '\0'};
931 
932 	/* All options use a ':' name/arg separator */
933 	if (*opt_arg != ':')
934 		return (opt_arg);
935 	opt_arg++;
936 	instance = -1;
937 	targ = -1;
938 	done = FALSE;
939 	/*
940 	 * Restore separator that may be in
941 	 * the middle of our option argument.
942 	 */
943 	tok_end = strchr(opt_arg, '\0');
944 	if (tok_end < end)
945 		*tok_end = ',';
946 	while (!done) {
947 		switch (*opt_arg) {
948 		case '{':
949 			if (instance == -1) {
950 				instance = 0;
951 			} else {
952 				if (depth > 1) {
953 					if (targ == -1)
954 						targ = 0;
955 				} else {
956 					printk("Malformed Option %s\n",
957 					       opt_name);
958 					done = TRUE;
959 				}
960 			}
961 			opt_arg++;
962 			break;
963 		case '}':
964 			if (targ != -1)
965 				targ = -1;
966 			else if (instance != -1)
967 				instance = -1;
968 			opt_arg++;
969 			break;
970 		case ',':
971 		case '.':
972 			if (instance == -1)
973 				done = TRUE;
974 			else if (targ >= 0)
975 				targ++;
976 			else if (instance >= 0)
977 				instance++;
978 			opt_arg++;
979 			break;
980 		case '\0':
981 			done = TRUE;
982 			break;
983 		default:
984 			tok_end = end;
985 			for (i = 0; tok_list[i]; i++) {
986 				tok_end2 = strchr(opt_arg, tok_list[i]);
987 				if ((tok_end2) && (tok_end2 < tok_end))
988 					tok_end = tok_end2;
989 			}
990 			callback(callback_arg, instance, targ,
991 				 simple_strtol(opt_arg, NULL, 0));
992 			opt_arg = tok_end;
993 			break;
994 		}
995 	}
996 	return (opt_arg);
997 }
998 
999 /*
1000  * Handle Linux boot parameters. This routine allows for assigning a value
1001  * to a parameter with a ':' between the parameter and the value.
1002  * ie. aic7xxx=stpwlev:1,extended
1003  */
1004 static int
1005 aic7xxx_setup(char *s)
1006 {
1007 	int	i, n;
1008 	char   *p;
1009 	char   *end;
1010 
1011 	static const struct {
1012 		const char *name;
1013 		uint32_t *flag;
1014 	} options[] = {
1015 		{ "extended", &aic7xxx_extended },
1016 		{ "no_reset", &aic7xxx_no_reset },
1017 		{ "verbose", &aic7xxx_verbose },
1018 		{ "allow_memio", &aic7xxx_allow_memio},
1019 #ifdef AHC_DEBUG
1020 		{ "debug", &ahc_debug },
1021 #endif
1022 		{ "periodic_otag", &aic7xxx_periodic_otag },
1023 		{ "pci_parity", &aic7xxx_pci_parity },
1024 		{ "seltime", &aic7xxx_seltime },
1025 		{ "tag_info", NULL },
1026 		{ "global_tag_depth", NULL },
1027 		{ "dv", NULL }
1028 	};
1029 
1030 	end = strchr(s, '\0');
1031 
1032 	/*
1033 	 * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1034 	 * will never be 0 in this case.
1035 	 */
1036 	n = 0;
1037 
1038 	while ((p = strsep(&s, ",.")) != NULL) {
1039 		if (*p == '\0')
1040 			continue;
1041 		for (i = 0; i < ARRAY_SIZE(options); i++) {
1042 
1043 			n = strlen(options[i].name);
1044 			if (strncmp(options[i].name, p, n) == 0)
1045 				break;
1046 		}
1047 		if (i == ARRAY_SIZE(options))
1048 			continue;
1049 
1050 		if (strncmp(p, "global_tag_depth", n) == 0) {
1051 			ahc_linux_setup_tag_info_global(p + n);
1052 		} else if (strncmp(p, "tag_info", n) == 0) {
1053 			s = ahc_parse_brace_option("tag_info", p + n, end,
1054 			    2, ahc_linux_setup_tag_info, 0);
1055 		} else if (p[n] == ':') {
1056 			*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1057 		} else if (strncmp(p, "verbose", n) == 0) {
1058 			*(options[i].flag) = 1;
1059 		} else {
1060 			*(options[i].flag) ^= 0xFFFFFFFF;
1061 		}
1062 	}
1063 	return 1;
1064 }
1065 
1066 __setup("aic7xxx=", aic7xxx_setup);
1067 
1068 uint32_t aic7xxx_verbose;
1069 
1070 int
1071 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1072 {
1073 	char	buf[80];
1074 	struct	Scsi_Host *host;
1075 	char	*new_name;
1076 	u_long	s;
1077 	int	retval;
1078 
1079 	template->name = ahc->description;
1080 	host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1081 	if (host == NULL)
1082 		return (ENOMEM);
1083 
1084 	*((struct ahc_softc **)host->hostdata) = ahc;
1085 	ahc->platform_data->host = host;
1086 	host->can_queue = AHC_MAX_QUEUE;
1087 	host->cmd_per_lun = 2;
1088 	/* XXX No way to communicate the ID for multiple channels */
1089 	host->this_id = ahc->our_id;
1090 	host->irq = ahc->platform_data->irq;
1091 	host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1092 	host->max_lun = AHC_NUM_LUNS;
1093 	host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1094 	host->sg_tablesize = AHC_NSEG;
1095 	ahc_lock(ahc, &s);
1096 	ahc_set_unit(ahc, ahc_linux_unit++);
1097 	ahc_unlock(ahc, &s);
1098 	sprintf(buf, "scsi%d", host->host_no);
1099 	new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1100 	if (new_name != NULL) {
1101 		strcpy(new_name, buf);
1102 		ahc_set_name(ahc, new_name);
1103 	}
1104 	host->unique_id = ahc->unit;
1105 	ahc_linux_initialize_scsi_bus(ahc);
1106 	ahc_intr_enable(ahc, TRUE);
1107 
1108 	host->transportt = ahc_linux_transport_template;
1109 
1110 	retval = scsi_add_host(host, ahc->dev);
1111 	if (retval) {
1112 		printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1113 		scsi_host_put(host);
1114 		return retval;
1115 	}
1116 
1117 	scsi_scan_host(host);
1118 	return 0;
1119 }
1120 
1121 /*
1122  * Place the SCSI bus into a known state by either resetting it,
1123  * or forcing transfer negotiations on the next command to any
1124  * target.
1125  */
1126 static void
1127 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1128 {
1129 	int i;
1130 	int numtarg;
1131 	unsigned long s;
1132 
1133 	i = 0;
1134 	numtarg = 0;
1135 
1136 	ahc_lock(ahc, &s);
1137 
1138 	if (aic7xxx_no_reset != 0)
1139 		ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1140 
1141 	if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1142 		ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1143 	else
1144 		numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1145 
1146 	if ((ahc->features & AHC_TWIN) != 0) {
1147 
1148 		if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1149 			ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1150 		} else {
1151 			if (numtarg == 0)
1152 				i = 8;
1153 			numtarg += 8;
1154 		}
1155 	}
1156 
1157 	/*
1158 	 * Force negotiation to async for all targets that
1159 	 * will not see an initial bus reset.
1160 	 */
1161 	for (; i < numtarg; i++) {
1162 		struct ahc_devinfo devinfo;
1163 		struct ahc_initiator_tinfo *tinfo;
1164 		struct ahc_tmode_tstate *tstate;
1165 		u_int our_id;
1166 		u_int target_id;
1167 		char channel;
1168 
1169 		channel = 'A';
1170 		our_id = ahc->our_id;
1171 		target_id = i;
1172 		if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1173 			channel = 'B';
1174 			our_id = ahc->our_id_b;
1175 			target_id = i % 8;
1176 		}
1177 		tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1178 					    target_id, &tstate);
1179 		ahc_compile_devinfo(&devinfo, our_id, target_id,
1180 				    CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1181 		ahc_update_neg_request(ahc, &devinfo, tstate,
1182 				       tinfo, AHC_NEG_ALWAYS);
1183 	}
1184 	ahc_unlock(ahc, &s);
1185 	/* Give the bus some time to recover */
1186 	if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1187 		ahc_linux_freeze_simq(ahc);
1188 		msleep(AIC7XXX_RESET_DELAY);
1189 		ahc_linux_release_simq(ahc);
1190 	}
1191 }
1192 
1193 int
1194 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1195 {
1196 
1197 	ahc->platform_data =
1198 	    kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
1199 	if (ahc->platform_data == NULL)
1200 		return (ENOMEM);
1201 	ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1202 	ahc_lockinit(ahc);
1203 	ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1204 	ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1205 	if (aic7xxx_pci_parity == 0)
1206 		ahc->flags |= AHC_DISABLE_PCI_PERR;
1207 
1208 	return (0);
1209 }
1210 
1211 void
1212 ahc_platform_free(struct ahc_softc *ahc)
1213 {
1214 	struct scsi_target *starget;
1215 	int i;
1216 
1217 	if (ahc->platform_data != NULL) {
1218 		/* destroy all of the device and target objects */
1219 		for (i = 0; i < AHC_NUM_TARGETS; i++) {
1220 			starget = ahc->platform_data->starget[i];
1221 			if (starget != NULL) {
1222 				ahc->platform_data->starget[i] = NULL;
1223 			}
1224 		}
1225 
1226 		if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1227 			free_irq(ahc->platform_data->irq, ahc);
1228 		if (ahc->tag == BUS_SPACE_PIO
1229 		 && ahc->bsh.ioport != 0)
1230 			release_region(ahc->bsh.ioport, 256);
1231 		if (ahc->tag == BUS_SPACE_MEMIO
1232 		 && ahc->bsh.maddr != NULL) {
1233 			iounmap(ahc->bsh.maddr);
1234 			release_mem_region(ahc->platform_data->mem_busaddr,
1235 					   0x1000);
1236 		}
1237 
1238 		if (ahc->platform_data->host)
1239 			scsi_host_put(ahc->platform_data->host);
1240 
1241 		kfree(ahc->platform_data);
1242 	}
1243 }
1244 
1245 void
1246 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1247 {
1248 	ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1249 				SCB_GET_CHANNEL(ahc, scb),
1250 				SCB_GET_LUN(scb), SCB_LIST_NULL,
1251 				ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1252 }
1253 
1254 void
1255 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1256 		      struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1257 {
1258 	struct ahc_linux_device *dev;
1259 	int was_queuing;
1260 	int now_queuing;
1261 
1262 	if (sdev == NULL)
1263 		return;
1264 	dev = scsi_transport_device_data(sdev);
1265 
1266 	was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1267 	switch (alg) {
1268 	default:
1269 	case AHC_QUEUE_NONE:
1270 		now_queuing = 0;
1271 		break;
1272 	case AHC_QUEUE_BASIC:
1273 		now_queuing = AHC_DEV_Q_BASIC;
1274 		break;
1275 	case AHC_QUEUE_TAGGED:
1276 		now_queuing = AHC_DEV_Q_TAGGED;
1277 		break;
1278 	}
1279 	if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1280 	 && (was_queuing != now_queuing)
1281 	 && (dev->active != 0)) {
1282 		dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1283 		dev->qfrozen++;
1284 	}
1285 
1286 	dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1287 	if (now_queuing) {
1288 		u_int usertags;
1289 
1290 		usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1291 		if (!was_queuing) {
1292 			/*
1293 			 * Start out aggressively and allow our
1294 			 * dynamic queue depth algorithm to take
1295 			 * care of the rest.
1296 			 */
1297 			dev->maxtags = usertags;
1298 			dev->openings = dev->maxtags - dev->active;
1299 		}
1300 		if (dev->maxtags == 0) {
1301 			/*
1302 			 * Queueing is disabled by the user.
1303 			 */
1304 			dev->openings = 1;
1305 		} else if (alg == AHC_QUEUE_TAGGED) {
1306 			dev->flags |= AHC_DEV_Q_TAGGED;
1307 			if (aic7xxx_periodic_otag != 0)
1308 				dev->flags |= AHC_DEV_PERIODIC_OTAG;
1309 		} else
1310 			dev->flags |= AHC_DEV_Q_BASIC;
1311 	} else {
1312 		/* We can only have one opening. */
1313 		dev->maxtags = 0;
1314 		dev->openings =  1 - dev->active;
1315 	}
1316 	switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1317 	case AHC_DEV_Q_BASIC:
1318 	case AHC_DEV_Q_TAGGED:
1319 		scsi_change_queue_depth(sdev,
1320 				dev->openings + dev->active);
1321 		break;
1322 	default:
1323 		/*
1324 		 * We allow the OS to queue 2 untagged transactions to
1325 		 * us at any time even though we can only execute them
1326 		 * serially on the controller/device.  This should
1327 		 * remove some latency.
1328 		 */
1329 		scsi_change_queue_depth(sdev, 2);
1330 		break;
1331 	}
1332 }
1333 
1334 int
1335 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1336 			int lun, u_int tag, role_t role, uint32_t status)
1337 {
1338 	return 0;
1339 }
1340 
1341 static u_int
1342 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1343 {
1344 	static int warned_user;
1345 	u_int tags;
1346 
1347 	tags = 0;
1348 	if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1349 		if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1350 			if (warned_user == 0) {
1351 
1352 				printk(KERN_WARNING
1353 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1354 "aic7xxx: for installed controllers. Using defaults\n"
1355 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1356 "aic7xxx: the aic7xxx_osm..c source file.\n");
1357 				warned_user++;
1358 			}
1359 			tags = AHC_MAX_QUEUE;
1360 		} else {
1361 			adapter_tag_info_t *tag_info;
1362 
1363 			tag_info = &aic7xxx_tag_info[ahc->unit];
1364 			tags = tag_info->tag_commands[devinfo->target_offset];
1365 			if (tags > AHC_MAX_QUEUE)
1366 				tags = AHC_MAX_QUEUE;
1367 		}
1368 	}
1369 	return (tags);
1370 }
1371 
1372 /*
1373  * Determines the queue depth for a given device.
1374  */
1375 static void
1376 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1377 {
1378 	struct	ahc_devinfo devinfo;
1379 	u_int	tags;
1380 	struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1381 
1382 	ahc_compile_devinfo(&devinfo,
1383 			    sdev->sdev_target->channel == 0
1384 			  ? ahc->our_id : ahc->our_id_b,
1385 			    sdev->sdev_target->id, sdev->lun,
1386 			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
1387 			    ROLE_INITIATOR);
1388 	tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1389 	if (tags != 0 && sdev->tagged_supported != 0) {
1390 
1391 		ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1392 		ahc_send_async(ahc, devinfo.channel, devinfo.target,
1393 			       devinfo.lun, AC_TRANSFER_NEG);
1394 		ahc_print_devinfo(ahc, &devinfo);
1395 		printk("Tagged Queuing enabled.  Depth %d\n", tags);
1396 	} else {
1397 		ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1398 		ahc_send_async(ahc, devinfo.channel, devinfo.target,
1399 			       devinfo.lun, AC_TRANSFER_NEG);
1400 	}
1401 }
1402 
1403 static int
1404 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1405 		      struct scsi_cmnd *cmd)
1406 {
1407 	struct	 scb *scb;
1408 	struct	 hardware_scb *hscb;
1409 	struct	 ahc_initiator_tinfo *tinfo;
1410 	struct	 ahc_tmode_tstate *tstate;
1411 	uint16_t mask;
1412 	struct scb_tailq *untagged_q = NULL;
1413 	int nseg;
1414 
1415 	/*
1416 	 * Schedule us to run later.  The only reason we are not
1417 	 * running is because the whole controller Q is frozen.
1418 	 */
1419 	if (ahc->platform_data->qfrozen != 0)
1420 		return SCSI_MLQUEUE_HOST_BUSY;
1421 
1422 	/*
1423 	 * We only allow one untagged transaction
1424 	 * per target in the initiator role unless
1425 	 * we are storing a full busy target *lun*
1426 	 * table in SCB space.
1427 	 */
1428 	if (!(cmd->flags & SCMD_TAGGED)
1429 	    && (ahc->features & AHC_SCB_BTT) == 0) {
1430 		int target_offset;
1431 
1432 		target_offset = cmd->device->id + cmd->device->channel * 8;
1433 		untagged_q = &(ahc->untagged_queues[target_offset]);
1434 		if (!TAILQ_EMPTY(untagged_q))
1435 			/* if we're already executing an untagged command
1436 			 * we're busy to another */
1437 			return SCSI_MLQUEUE_DEVICE_BUSY;
1438 	}
1439 
1440 	nseg = scsi_dma_map(cmd);
1441 	if (nseg < 0)
1442 		return SCSI_MLQUEUE_HOST_BUSY;
1443 
1444 	/*
1445 	 * Get an scb to use.
1446 	 */
1447 	scb = ahc_get_scb(ahc);
1448 	if (!scb) {
1449 		scsi_dma_unmap(cmd);
1450 		return SCSI_MLQUEUE_HOST_BUSY;
1451 	}
1452 
1453 	scb->io_ctx = cmd;
1454 	scb->platform_data->dev = dev;
1455 	hscb = scb->hscb;
1456 	cmd->host_scribble = (char *)scb;
1457 
1458 	/*
1459 	 * Fill out basics of the HSCB.
1460 	 */
1461 	hscb->control = 0;
1462 	hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1463 	hscb->lun = cmd->device->lun;
1464 	mask = SCB_GET_TARGET_MASK(ahc, scb);
1465 	tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1466 				    SCB_GET_OUR_ID(scb),
1467 				    SCB_GET_TARGET(ahc, scb), &tstate);
1468 	hscb->scsirate = tinfo->scsirate;
1469 	hscb->scsioffset = tinfo->curr.offset;
1470 	if ((tstate->ultraenb & mask) != 0)
1471 		hscb->control |= ULTRAENB;
1472 
1473 	if ((ahc->user_discenable & mask) != 0)
1474 		hscb->control |= DISCENB;
1475 
1476 	if ((tstate->auto_negotiate & mask) != 0) {
1477 		scb->flags |= SCB_AUTO_NEGOTIATE;
1478 		scb->hscb->control |= MK_MESSAGE;
1479 	}
1480 
1481 	if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1482 		if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1483 				&& (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1484 			hscb->control |= ORDERED_QUEUE_TAG;
1485 			dev->commands_since_idle_or_otag = 0;
1486 		} else {
1487 			hscb->control |= SIMPLE_QUEUE_TAG;
1488 		}
1489 	}
1490 
1491 	hscb->cdb_len = cmd->cmd_len;
1492 	if (hscb->cdb_len <= 12) {
1493 		memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1494 	} else {
1495 		memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1496 		scb->flags |= SCB_CDB32_PTR;
1497 	}
1498 
1499 	scb->platform_data->xfer_len = 0;
1500 	ahc_set_residual(scb, 0);
1501 	ahc_set_sense_residual(scb, 0);
1502 	scb->sg_count = 0;
1503 
1504 	if (nseg > 0) {
1505 		struct	ahc_dma_seg *sg;
1506 		struct	scatterlist *cur_seg;
1507 		int i;
1508 
1509 		/* Copy the segments into the SG list. */
1510 		sg = scb->sg_list;
1511 		/*
1512 		 * The sg_count may be larger than nseg if
1513 		 * a transfer crosses a 32bit page.
1514 		 */
1515 		scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1516 			dma_addr_t addr;
1517 			bus_size_t len;
1518 			int consumed;
1519 
1520 			addr = sg_dma_address(cur_seg);
1521 			len = sg_dma_len(cur_seg);
1522 			consumed = ahc_linux_map_seg(ahc, scb,
1523 						     sg, addr, len);
1524 			sg += consumed;
1525 			scb->sg_count += consumed;
1526 		}
1527 		sg--;
1528 		sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1529 
1530 		/*
1531 		 * Reset the sg list pointer.
1532 		 */
1533 		scb->hscb->sgptr =
1534 			ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1535 
1536 		/*
1537 		 * Copy the first SG into the "current"
1538 		 * data pointer area.
1539 		 */
1540 		scb->hscb->dataptr = scb->sg_list->addr;
1541 		scb->hscb->datacnt = scb->sg_list->len;
1542 	} else {
1543 		scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1544 		scb->hscb->dataptr = 0;
1545 		scb->hscb->datacnt = 0;
1546 		scb->sg_count = 0;
1547 	}
1548 
1549 	LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1550 	dev->openings--;
1551 	dev->active++;
1552 	dev->commands_issued++;
1553 	if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1554 		dev->commands_since_idle_or_otag++;
1555 
1556 	scb->flags |= SCB_ACTIVE;
1557 	if (untagged_q) {
1558 		TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1559 		scb->flags |= SCB_UNTAGGEDQ;
1560 	}
1561 	ahc_queue_scb(ahc, scb);
1562 	return 0;
1563 }
1564 
1565 /*
1566  * SCSI controller interrupt handler.
1567  */
1568 irqreturn_t
1569 ahc_linux_isr(int irq, void *dev_id)
1570 {
1571 	struct	ahc_softc *ahc;
1572 	u_long	flags;
1573 	int	ours;
1574 
1575 	ahc = (struct ahc_softc *) dev_id;
1576 	ahc_lock(ahc, &flags);
1577 	ours = ahc_intr(ahc);
1578 	ahc_unlock(ahc, &flags);
1579 	return IRQ_RETVAL(ours);
1580 }
1581 
1582 void
1583 ahc_platform_flushwork(struct ahc_softc *ahc)
1584 {
1585 
1586 }
1587 
1588 void
1589 ahc_send_async(struct ahc_softc *ahc, char channel,
1590 	       u_int target, u_int lun, ac_code code)
1591 {
1592 	switch (code) {
1593 	case AC_TRANSFER_NEG:
1594 	{
1595 		struct	scsi_target *starget;
1596 		struct	ahc_initiator_tinfo *tinfo;
1597 		struct	ahc_tmode_tstate *tstate;
1598 		int	target_offset;
1599 		unsigned int target_ppr_options;
1600 
1601 		BUG_ON(target == CAM_TARGET_WILDCARD);
1602 
1603 		tinfo = ahc_fetch_transinfo(ahc, channel,
1604 						channel == 'A' ? ahc->our_id
1605 							       : ahc->our_id_b,
1606 						target, &tstate);
1607 
1608 		/*
1609 		 * Don't bother reporting results while
1610 		 * negotiations are still pending.
1611 		 */
1612 		if (tinfo->curr.period != tinfo->goal.period
1613 		 || tinfo->curr.width != tinfo->goal.width
1614 		 || tinfo->curr.offset != tinfo->goal.offset
1615 		 || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1616 			if (bootverbose == 0)
1617 				break;
1618 
1619 		/*
1620 		 * Don't bother reporting results that
1621 		 * are identical to those last reported.
1622 		 */
1623 		target_offset = target;
1624 		if (channel == 'B')
1625 			target_offset += 8;
1626 		starget = ahc->platform_data->starget[target_offset];
1627 		if (starget == NULL)
1628 			break;
1629 
1630 		target_ppr_options =
1631 			(spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1632 			+ (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1633 			+ (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1634 
1635 		if (tinfo->curr.period == spi_period(starget)
1636 		    && tinfo->curr.width == spi_width(starget)
1637 		    && tinfo->curr.offset == spi_offset(starget)
1638 		 && tinfo->curr.ppr_options == target_ppr_options)
1639 			if (bootverbose == 0)
1640 				break;
1641 
1642 		spi_period(starget) = tinfo->curr.period;
1643 		spi_width(starget) = tinfo->curr.width;
1644 		spi_offset(starget) = tinfo->curr.offset;
1645 		spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1646 		spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1647 		spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1648 		spi_display_xfer_agreement(starget);
1649 		break;
1650 	}
1651 	case AC_SENT_BDR:
1652 	{
1653 		WARN_ON(lun != CAM_LUN_WILDCARD);
1654 		scsi_report_device_reset(ahc->platform_data->host,
1655 					 channel - 'A', target);
1656 		break;
1657 	}
1658 	case AC_BUS_RESET:
1659 		if (ahc->platform_data->host != NULL) {
1660 			scsi_report_bus_reset(ahc->platform_data->host,
1661 					      channel - 'A');
1662 		}
1663 		break;
1664 	default:
1665 		panic("ahc_send_async: Unexpected async event");
1666 	}
1667 }
1668 
1669 /*
1670  * Calls the higher level scsi done function and frees the scb.
1671  */
1672 void
1673 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1674 {
1675 	struct scsi_cmnd *cmd;
1676 	struct	   ahc_linux_device *dev;
1677 
1678 	LIST_REMOVE(scb, pending_links);
1679 	if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1680 		struct scb_tailq *untagged_q;
1681 		int target_offset;
1682 
1683 		target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1684 		untagged_q = &(ahc->untagged_queues[target_offset]);
1685 		TAILQ_REMOVE(untagged_q, scb, links.tqe);
1686 		BUG_ON(!TAILQ_EMPTY(untagged_q));
1687 	} else if ((scb->flags & SCB_ACTIVE) == 0) {
1688 		/*
1689 		 * Transactions aborted from the untagged queue may
1690 		 * not have been dispatched to the controller, so
1691 		 * only check the SCB_ACTIVE flag for tagged transactions.
1692 		 */
1693 		printk("SCB %d done'd twice\n", scb->hscb->tag);
1694 		ahc_dump_card_state(ahc);
1695 		panic("Stopping for safety");
1696 	}
1697 	cmd = scb->io_ctx;
1698 	dev = scb->platform_data->dev;
1699 	dev->active--;
1700 	dev->openings++;
1701 	if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1702 		cmd->result &= ~(CAM_DEV_QFRZN << 16);
1703 		dev->qfrozen--;
1704 	}
1705 	ahc_linux_unmap_scb(ahc, scb);
1706 
1707 	/*
1708 	 * Guard against stale sense data.
1709 	 * The Linux mid-layer assumes that sense
1710 	 * was retrieved anytime the first byte of
1711 	 * the sense buffer looks "sane".
1712 	 */
1713 	cmd->sense_buffer[0] = 0;
1714 	if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1715 #ifdef AHC_REPORT_UNDERFLOWS
1716 		uint32_t amount_xferred;
1717 
1718 		amount_xferred =
1719 		    ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1720 #endif
1721 		if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1722 #ifdef AHC_DEBUG
1723 			if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1724 				ahc_print_path(ahc, scb);
1725 				printk("Set CAM_UNCOR_PARITY\n");
1726 			}
1727 #endif
1728 			ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1729 #ifdef AHC_REPORT_UNDERFLOWS
1730 		/*
1731 		 * This code is disabled by default as some
1732 		 * clients of the SCSI system do not properly
1733 		 * initialize the underflow parameter.  This
1734 		 * results in spurious termination of commands
1735 		 * that complete as expected (e.g. underflow is
1736 		 * allowed as command can return variable amounts
1737 		 * of data.
1738 		 */
1739 		} else if (amount_xferred < scb->io_ctx->underflow) {
1740 			u_int i;
1741 
1742 			ahc_print_path(ahc, scb);
1743 			printk("CDB:");
1744 			for (i = 0; i < scb->io_ctx->cmd_len; i++)
1745 				printk(" 0x%x", scb->io_ctx->cmnd[i]);
1746 			printk("\n");
1747 			ahc_print_path(ahc, scb);
1748 			printk("Saw underflow (%ld of %ld bytes). "
1749 			       "Treated as error\n",
1750 				ahc_get_residual(scb),
1751 				ahc_get_transfer_length(scb));
1752 			ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1753 #endif
1754 		} else {
1755 			ahc_set_transaction_status(scb, CAM_REQ_CMP);
1756 		}
1757 	} else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1758 		ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1759 	}
1760 
1761 	if (dev->openings == 1
1762 	 && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1763 	 && ahc_get_scsi_status(scb) != SAM_STAT_TASK_SET_FULL)
1764 		dev->tag_success_count++;
1765 	/*
1766 	 * Some devices deal with temporary internal resource
1767 	 * shortages by returning queue full.  When the queue
1768 	 * full occurrs, we throttle back.  Slowly try to get
1769 	 * back to our previous queue depth.
1770 	 */
1771 	if ((dev->openings + dev->active) < dev->maxtags
1772 	 && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1773 		dev->tag_success_count = 0;
1774 		dev->openings++;
1775 	}
1776 
1777 	if (dev->active == 0)
1778 		dev->commands_since_idle_or_otag = 0;
1779 
1780 	if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1781 		printk("Recovery SCB completes\n");
1782 		if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1783 		 || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1784 			ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1785 
1786 		if (ahc->platform_data->eh_done)
1787 			complete(ahc->platform_data->eh_done);
1788 	}
1789 
1790 	ahc_free_scb(ahc, scb);
1791 	ahc_linux_queue_cmd_complete(ahc, cmd);
1792 }
1793 
1794 static void
1795 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1796 			     struct scsi_device *sdev, struct scb *scb)
1797 {
1798 	struct	ahc_devinfo devinfo;
1799 	struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1800 
1801 	ahc_compile_devinfo(&devinfo,
1802 			    ahc->our_id,
1803 			    sdev->sdev_target->id, sdev->lun,
1804 			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
1805 			    ROLE_INITIATOR);
1806 
1807 	/*
1808 	 * We don't currently trust the mid-layer to
1809 	 * properly deal with queue full or busy.  So,
1810 	 * when one occurs, we tell the mid-layer to
1811 	 * unconditionally requeue the command to us
1812 	 * so that we can retry it ourselves.  We also
1813 	 * implement our own throttling mechanism so
1814 	 * we don't clobber the device with too many
1815 	 * commands.
1816 	 */
1817 	switch (ahc_get_scsi_status(scb)) {
1818 	default:
1819 		break;
1820 	case SAM_STAT_CHECK_CONDITION:
1821 	case SAM_STAT_COMMAND_TERMINATED:
1822 	{
1823 		struct scsi_cmnd *cmd;
1824 
1825 		/*
1826 		 * Copy sense information to the OS's cmd
1827 		 * structure if it is available.
1828 		 */
1829 		cmd = scb->io_ctx;
1830 		if (scb->flags & SCB_SENSE) {
1831 			u_int sense_size;
1832 
1833 			sense_size = min(sizeof(struct scsi_sense_data)
1834 				       - ahc_get_sense_residual(scb),
1835 					 (u_long)SCSI_SENSE_BUFFERSIZE);
1836 			memcpy(cmd->sense_buffer,
1837 			       ahc_get_sense_buf(ahc, scb), sense_size);
1838 			if (sense_size < SCSI_SENSE_BUFFERSIZE)
1839 				memset(&cmd->sense_buffer[sense_size], 0,
1840 				       SCSI_SENSE_BUFFERSIZE - sense_size);
1841 			cmd->result |= (DRIVER_SENSE << 24);
1842 #ifdef AHC_DEBUG
1843 			if (ahc_debug & AHC_SHOW_SENSE) {
1844 				int i;
1845 
1846 				printk("Copied %d bytes of sense data:",
1847 				       sense_size);
1848 				for (i = 0; i < sense_size; i++) {
1849 					if ((i & 0xF) == 0)
1850 						printk("\n");
1851 					printk("0x%x ", cmd->sense_buffer[i]);
1852 				}
1853 				printk("\n");
1854 			}
1855 #endif
1856 		}
1857 		break;
1858 	}
1859 	case SAM_STAT_TASK_SET_FULL:
1860 	{
1861 		/*
1862 		 * By the time the core driver has returned this
1863 		 * command, all other commands that were queued
1864 		 * to us but not the device have been returned.
1865 		 * This ensures that dev->active is equal to
1866 		 * the number of commands actually queued to
1867 		 * the device.
1868 		 */
1869 		dev->tag_success_count = 0;
1870 		if (dev->active != 0) {
1871 			/*
1872 			 * Drop our opening count to the number
1873 			 * of commands currently outstanding.
1874 			 */
1875 			dev->openings = 0;
1876 /*
1877 			ahc_print_path(ahc, scb);
1878 			printk("Dropping tag count to %d\n", dev->active);
1879  */
1880 			if (dev->active == dev->tags_on_last_queuefull) {
1881 
1882 				dev->last_queuefull_same_count++;
1883 				/*
1884 				 * If we repeatedly see a queue full
1885 				 * at the same queue depth, this
1886 				 * device has a fixed number of tag
1887 				 * slots.  Lock in this tag depth
1888 				 * so we stop seeing queue fulls from
1889 				 * this device.
1890 				 */
1891 				if (dev->last_queuefull_same_count
1892 				 == AHC_LOCK_TAGS_COUNT) {
1893 					dev->maxtags = dev->active;
1894 					ahc_print_path(ahc, scb);
1895 					printk("Locking max tag count at %d\n",
1896 					       dev->active);
1897 				}
1898 			} else {
1899 				dev->tags_on_last_queuefull = dev->active;
1900 				dev->last_queuefull_same_count = 0;
1901 			}
1902 			ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1903 			ahc_set_scsi_status(scb, SAM_STAT_GOOD);
1904 			ahc_platform_set_tags(ahc, sdev, &devinfo,
1905 				     (dev->flags & AHC_DEV_Q_BASIC)
1906 				   ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1907 			break;
1908 		}
1909 		/*
1910 		 * Drop down to a single opening, and treat this
1911 		 * as if the target returned BUSY SCSI status.
1912 		 */
1913 		dev->openings = 1;
1914 		ahc_set_scsi_status(scb, SAM_STAT_BUSY);
1915 		ahc_platform_set_tags(ahc, sdev, &devinfo,
1916 			     (dev->flags & AHC_DEV_Q_BASIC)
1917 			   ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1918 		break;
1919 	}
1920 	}
1921 }
1922 
1923 static void
1924 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1925 {
1926 	/*
1927 	 * Map CAM error codes into Linux Error codes.  We
1928 	 * avoid the conversion so that the DV code has the
1929 	 * full error information available when making
1930 	 * state change decisions.
1931 	 */
1932 	{
1933 		u_int new_status;
1934 
1935 		switch (ahc_cmd_get_transaction_status(cmd)) {
1936 		case CAM_REQ_INPROG:
1937 		case CAM_REQ_CMP:
1938 		case CAM_SCSI_STATUS_ERROR:
1939 			new_status = DID_OK;
1940 			break;
1941 		case CAM_REQ_ABORTED:
1942 			new_status = DID_ABORT;
1943 			break;
1944 		case CAM_BUSY:
1945 			new_status = DID_BUS_BUSY;
1946 			break;
1947 		case CAM_REQ_INVALID:
1948 		case CAM_PATH_INVALID:
1949 			new_status = DID_BAD_TARGET;
1950 			break;
1951 		case CAM_SEL_TIMEOUT:
1952 			new_status = DID_NO_CONNECT;
1953 			break;
1954 		case CAM_SCSI_BUS_RESET:
1955 		case CAM_BDR_SENT:
1956 			new_status = DID_RESET;
1957 			break;
1958 		case CAM_UNCOR_PARITY:
1959 			new_status = DID_PARITY;
1960 			break;
1961 		case CAM_CMD_TIMEOUT:
1962 			new_status = DID_TIME_OUT;
1963 			break;
1964 		case CAM_UA_ABORT:
1965 		case CAM_REQ_CMP_ERR:
1966 		case CAM_AUTOSENSE_FAIL:
1967 		case CAM_NO_HBA:
1968 		case CAM_DATA_RUN_ERR:
1969 		case CAM_UNEXP_BUSFREE:
1970 		case CAM_SEQUENCE_FAIL:
1971 		case CAM_CCB_LEN_ERR:
1972 		case CAM_PROVIDE_FAIL:
1973 		case CAM_REQ_TERMIO:
1974 		case CAM_UNREC_HBA_ERROR:
1975 		case CAM_REQ_TOO_BIG:
1976 			new_status = DID_ERROR;
1977 			break;
1978 		case CAM_REQUEUE_REQ:
1979 			new_status = DID_REQUEUE;
1980 			break;
1981 		default:
1982 			/* We should never get here */
1983 			new_status = DID_ERROR;
1984 			break;
1985 		}
1986 
1987 		ahc_cmd_set_transaction_status(cmd, new_status);
1988 	}
1989 
1990 	cmd->scsi_done(cmd);
1991 }
1992 
1993 static void
1994 ahc_linux_freeze_simq(struct ahc_softc *ahc)
1995 {
1996 	unsigned long s;
1997 
1998 	ahc_lock(ahc, &s);
1999 	ahc->platform_data->qfrozen++;
2000 	if (ahc->platform_data->qfrozen == 1) {
2001 		scsi_block_requests(ahc->platform_data->host);
2002 
2003 		/* XXX What about Twin channels? */
2004 		ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2005 					CAM_LUN_WILDCARD, SCB_LIST_NULL,
2006 					ROLE_INITIATOR, CAM_REQUEUE_REQ);
2007 	}
2008 	ahc_unlock(ahc, &s);
2009 }
2010 
2011 static void
2012 ahc_linux_release_simq(struct ahc_softc *ahc)
2013 {
2014 	u_long s;
2015 	int    unblock_reqs;
2016 
2017 	unblock_reqs = 0;
2018 	ahc_lock(ahc, &s);
2019 	if (ahc->platform_data->qfrozen > 0)
2020 		ahc->platform_data->qfrozen--;
2021 	if (ahc->platform_data->qfrozen == 0)
2022 		unblock_reqs = 1;
2023 	ahc_unlock(ahc, &s);
2024 	/*
2025 	 * There is still a race here.  The mid-layer
2026 	 * should keep its own freeze count and use
2027 	 * a bottom half handler to run the queues
2028 	 * so we can unblock with our own lock held.
2029 	 */
2030 	if (unblock_reqs)
2031 		scsi_unblock_requests(ahc->platform_data->host);
2032 }
2033 
2034 static int
2035 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2036 {
2037 	struct ahc_softc *ahc;
2038 	struct ahc_linux_device *dev;
2039 	struct scb *pending_scb;
2040 	u_int  saved_scbptr;
2041 	u_int  active_scb_index;
2042 	u_int  last_phase;
2043 	u_int  saved_scsiid;
2044 	u_int  cdb_byte;
2045 	int    retval;
2046 	int    was_paused;
2047 	int    paused;
2048 	int    wait;
2049 	int    disconnected;
2050 	unsigned long flags;
2051 
2052 	pending_scb = NULL;
2053 	paused = FALSE;
2054 	wait = FALSE;
2055 	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2056 
2057 	scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2058 	       flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2059 
2060 	printk("CDB:");
2061 	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2062 		printk(" 0x%x", cmd->cmnd[cdb_byte]);
2063 	printk("\n");
2064 
2065 	ahc_lock(ahc, &flags);
2066 
2067 	/*
2068 	 * First determine if we currently own this command.
2069 	 * Start by searching the device queue.  If not found
2070 	 * there, check the pending_scb list.  If not found
2071 	 * at all, and the system wanted us to just abort the
2072 	 * command, return success.
2073 	 */
2074 	dev = scsi_transport_device_data(cmd->device);
2075 
2076 	if (dev == NULL) {
2077 		/*
2078 		 * No target device for this command exists,
2079 		 * so we must not still own the command.
2080 		 */
2081 		printk("%s:%d:%d:%d: Is not an active device\n",
2082 		       ahc_name(ahc), cmd->device->channel, cmd->device->id,
2083 		       (u8)cmd->device->lun);
2084 		retval = SUCCESS;
2085 		goto no_cmd;
2086 	}
2087 
2088 	if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2089 	 && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2090 				       cmd->device->channel + 'A',
2091 				       (u8)cmd->device->lun,
2092 				       CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2093 		printk("%s:%d:%d:%d: Command found on untagged queue\n",
2094 		       ahc_name(ahc), cmd->device->channel, cmd->device->id,
2095 		       (u8)cmd->device->lun);
2096 		retval = SUCCESS;
2097 		goto done;
2098 	}
2099 
2100 	/*
2101 	 * See if we can find a matching cmd in the pending list.
2102 	 */
2103 	LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2104 		if (pending_scb->io_ctx == cmd)
2105 			break;
2106 	}
2107 
2108 	if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2109 
2110 		/* Any SCB for this device will do for a target reset */
2111 		LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2112 			if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2113 					  scmd_channel(cmd) + 'A',
2114 					  CAM_LUN_WILDCARD,
2115 					  SCB_LIST_NULL, ROLE_INITIATOR))
2116 				break;
2117 		}
2118 	}
2119 
2120 	if (pending_scb == NULL) {
2121 		scmd_printk(KERN_INFO, cmd, "Command not found\n");
2122 		goto no_cmd;
2123 	}
2124 
2125 	if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2126 		/*
2127 		 * We can't queue two recovery actions using the same SCB
2128 		 */
2129 		retval = FAILED;
2130 		goto  done;
2131 	}
2132 
2133 	/*
2134 	 * Ensure that the card doesn't do anything
2135 	 * behind our back and that we didn't "just" miss
2136 	 * an interrupt that would affect this cmd.
2137 	 */
2138 	was_paused = ahc_is_paused(ahc);
2139 	ahc_pause_and_flushwork(ahc);
2140 	paused = TRUE;
2141 
2142 	if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2143 		scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2144 		goto no_cmd;
2145 	}
2146 
2147 	printk("%s: At time of recovery, card was %spaused\n",
2148 	       ahc_name(ahc), was_paused ? "" : "not ");
2149 	ahc_dump_card_state(ahc);
2150 
2151 	disconnected = TRUE;
2152 	if (flag == SCB_ABORT) {
2153 		if (ahc_search_qinfifo(ahc, cmd->device->id,
2154 				       cmd->device->channel + 'A',
2155 				       cmd->device->lun,
2156 				       pending_scb->hscb->tag,
2157 				       ROLE_INITIATOR, CAM_REQ_ABORTED,
2158 				       SEARCH_COMPLETE) > 0) {
2159 			printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2160 			       ahc_name(ahc), cmd->device->channel,
2161 			       cmd->device->id, (u8)cmd->device->lun);
2162 			retval = SUCCESS;
2163 			goto done;
2164 		}
2165 	} else if (ahc_search_qinfifo(ahc, cmd->device->id,
2166 				      cmd->device->channel + 'A',
2167 				      cmd->device->lun,
2168 				      pending_scb->hscb->tag,
2169 				      ROLE_INITIATOR, /*status*/0,
2170 				      SEARCH_COUNT) > 0) {
2171 		disconnected = FALSE;
2172 	}
2173 
2174 	if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2175 		struct scb *bus_scb;
2176 
2177 		bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2178 		if (bus_scb == pending_scb)
2179 			disconnected = FALSE;
2180 		else if (flag != SCB_ABORT
2181 		      && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2182 		      && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2183 			disconnected = FALSE;
2184 	}
2185 
2186 	/*
2187 	 * At this point, pending_scb is the scb associated with the
2188 	 * passed in command.  That command is currently active on the
2189 	 * bus, is in the disconnected state, or we're hoping to find
2190 	 * a command for the same target active on the bus to abuse to
2191 	 * send a BDR.  Queue the appropriate message based on which of
2192 	 * these states we are in.
2193 	 */
2194 	last_phase = ahc_inb(ahc, LASTPHASE);
2195 	saved_scbptr = ahc_inb(ahc, SCBPTR);
2196 	active_scb_index = ahc_inb(ahc, SCB_TAG);
2197 	saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2198 	if (last_phase != P_BUSFREE
2199 	 && (pending_scb->hscb->tag == active_scb_index
2200 	  || (flag == SCB_DEVICE_RESET
2201 	   && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2202 
2203 		/*
2204 		 * We're active on the bus, so assert ATN
2205 		 * and hope that the target responds.
2206 		 */
2207 		pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2208 		pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2209 		ahc_outb(ahc, MSG_OUT, HOST_MSG);
2210 		ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2211 		scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2212 		wait = TRUE;
2213 	} else if (disconnected) {
2214 
2215 		/*
2216 		 * Actually re-queue this SCB in an attempt
2217 		 * to select the device before it reconnects.
2218 		 * In either case (selection or reselection),
2219 		 * we will now issue the approprate message
2220 		 * to the timed-out device.
2221 		 *
2222 		 * Set the MK_MESSAGE control bit indicating
2223 		 * that we desire to send a message.  We
2224 		 * also set the disconnected flag since
2225 		 * in the paging case there is no guarantee
2226 		 * that our SCB control byte matches the
2227 		 * version on the card.  We don't want the
2228 		 * sequencer to abort the command thinking
2229 		 * an unsolicited reselection occurred.
2230 		 */
2231 		pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2232 		pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2233 
2234 		/*
2235 		 * Remove any cached copy of this SCB in the
2236 		 * disconnected list in preparation for the
2237 		 * queuing of our abort SCB.  We use the
2238 		 * same element in the SCB, SCB_NEXT, for
2239 		 * both the qinfifo and the disconnected list.
2240 		 */
2241 		ahc_search_disc_list(ahc, cmd->device->id,
2242 				     cmd->device->channel + 'A',
2243 				     cmd->device->lun, pending_scb->hscb->tag,
2244 				     /*stop_on_first*/TRUE,
2245 				     /*remove*/TRUE,
2246 				     /*save_state*/FALSE);
2247 
2248 		/*
2249 		 * In the non-paging case, the sequencer will
2250 		 * never re-reference the in-core SCB.
2251 		 * To make sure we are notified during
2252 		 * reselection, set the MK_MESSAGE flag in
2253 		 * the card's copy of the SCB.
2254 		 */
2255 		if ((ahc->flags & AHC_PAGESCBS) == 0) {
2256 			ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2257 			ahc_outb(ahc, SCB_CONTROL,
2258 				 ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2259 		}
2260 
2261 		/*
2262 		 * Clear out any entries in the QINFIFO first
2263 		 * so we are the next SCB for this target
2264 		 * to run.
2265 		 */
2266 		ahc_search_qinfifo(ahc, cmd->device->id,
2267 				   cmd->device->channel + 'A',
2268 				   cmd->device->lun, SCB_LIST_NULL,
2269 				   ROLE_INITIATOR, CAM_REQUEUE_REQ,
2270 				   SEARCH_COMPLETE);
2271 		ahc_qinfifo_requeue_tail(ahc, pending_scb);
2272 		ahc_outb(ahc, SCBPTR, saved_scbptr);
2273 		ahc_print_path(ahc, pending_scb);
2274 		printk("Device is disconnected, re-queuing SCB\n");
2275 		wait = TRUE;
2276 	} else {
2277 		scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2278 		retval = FAILED;
2279 		goto done;
2280 	}
2281 
2282 no_cmd:
2283 	/*
2284 	 * Our assumption is that if we don't have the command, no
2285 	 * recovery action was required, so we return success.  Again,
2286 	 * the semantics of the mid-layer recovery engine are not
2287 	 * well defined, so this may change in time.
2288 	 */
2289 	retval = SUCCESS;
2290 done:
2291 	if (paused)
2292 		ahc_unpause(ahc);
2293 	if (wait) {
2294 		DECLARE_COMPLETION_ONSTACK(done);
2295 
2296 		ahc->platform_data->eh_done = &done;
2297 		ahc_unlock(ahc, &flags);
2298 
2299 		printk("Recovery code sleeping\n");
2300 		if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2301 			ahc_lock(ahc, &flags);
2302 			ahc->platform_data->eh_done = NULL;
2303 			ahc_unlock(ahc, &flags);
2304 
2305 			printk("Timer Expired\n");
2306 			retval = FAILED;
2307 		}
2308 		printk("Recovery code awake\n");
2309 	} else
2310 		ahc_unlock(ahc, &flags);
2311 	return (retval);
2312 }
2313 
2314 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2315 {
2316 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2317 	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2318 	struct ahc_devinfo devinfo;
2319 	unsigned long flags;
2320 
2321 	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2322 			    starget->channel + 'A', ROLE_INITIATOR);
2323 	ahc_lock(ahc, &flags);
2324 	ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2325 	ahc_unlock(ahc, &flags);
2326 }
2327 
2328 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2329 {
2330 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2331 	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2332 	struct ahc_tmode_tstate *tstate;
2333 	struct ahc_initiator_tinfo *tinfo
2334 		= ahc_fetch_transinfo(ahc,
2335 				      starget->channel + 'A',
2336 				      shost->this_id, starget->id, &tstate);
2337 	struct ahc_devinfo devinfo;
2338 	unsigned int ppr_options = tinfo->goal.ppr_options;
2339 	unsigned long flags;
2340 	unsigned long offset = tinfo->goal.offset;
2341 	const struct ahc_syncrate *syncrate;
2342 
2343 	if (offset == 0)
2344 		offset = MAX_OFFSET;
2345 
2346 	if (period < 9)
2347 		period = 9;	/* 12.5ns is our minimum */
2348 	if (period == 9) {
2349 		if (spi_max_width(starget))
2350 			ppr_options |= MSG_EXT_PPR_DT_REQ;
2351 		else
2352 			/* need wide for DT and need DT for 12.5 ns */
2353 			period = 10;
2354 	}
2355 
2356 	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2357 			    starget->channel + 'A', ROLE_INITIATOR);
2358 
2359 	/* all PPR requests apart from QAS require wide transfers */
2360 	if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2361 		if (spi_width(starget) == 0)
2362 			ppr_options &= MSG_EXT_PPR_QAS_REQ;
2363 	}
2364 
2365 	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2366 				     AHC_SYNCRATE_DT);
2367 	ahc_lock(ahc, &flags);
2368 	ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2369 			 ppr_options, AHC_TRANS_GOAL, FALSE);
2370 	ahc_unlock(ahc, &flags);
2371 }
2372 
2373 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2374 {
2375 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2376 	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2377 	struct ahc_tmode_tstate *tstate;
2378 	struct ahc_initiator_tinfo *tinfo
2379 		= ahc_fetch_transinfo(ahc,
2380 				      starget->channel + 'A',
2381 				      shost->this_id, starget->id, &tstate);
2382 	struct ahc_devinfo devinfo;
2383 	unsigned int ppr_options = 0;
2384 	unsigned int period = 0;
2385 	unsigned long flags;
2386 	const struct ahc_syncrate *syncrate = NULL;
2387 
2388 	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2389 			    starget->channel + 'A', ROLE_INITIATOR);
2390 	if (offset != 0) {
2391 		syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2392 					     AHC_SYNCRATE_DT);
2393 		period = tinfo->goal.period;
2394 		ppr_options = tinfo->goal.ppr_options;
2395 	}
2396 	ahc_lock(ahc, &flags);
2397 	ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2398 			 ppr_options, AHC_TRANS_GOAL, FALSE);
2399 	ahc_unlock(ahc, &flags);
2400 }
2401 
2402 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2403 {
2404 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2405 	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2406 	struct ahc_tmode_tstate *tstate;
2407 	struct ahc_initiator_tinfo *tinfo
2408 		= ahc_fetch_transinfo(ahc,
2409 				      starget->channel + 'A',
2410 				      shost->this_id, starget->id, &tstate);
2411 	struct ahc_devinfo devinfo;
2412 	unsigned int ppr_options = tinfo->goal.ppr_options
2413 		& ~MSG_EXT_PPR_DT_REQ;
2414 	unsigned int period = tinfo->goal.period;
2415 	unsigned int width = tinfo->goal.width;
2416 	unsigned long flags;
2417 	const struct ahc_syncrate *syncrate;
2418 
2419 	if (dt && spi_max_width(starget)) {
2420 		ppr_options |= MSG_EXT_PPR_DT_REQ;
2421 		if (!width)
2422 			ahc_linux_set_width(starget, 1);
2423 	} else if (period == 9)
2424 		period = 10;	/* if resetting DT, period must be >= 25ns */
2425 
2426 	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2427 			    starget->channel + 'A', ROLE_INITIATOR);
2428 	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2429 				     AHC_SYNCRATE_DT);
2430 	ahc_lock(ahc, &flags);
2431 	ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2432 			 ppr_options, AHC_TRANS_GOAL, FALSE);
2433 	ahc_unlock(ahc, &flags);
2434 }
2435 
2436 #if 0
2437 /* FIXME: This code claims to support IU and QAS.  However, the actual
2438  * sequencer code and aic7xxx_core have no support for these parameters and
2439  * will get into a bad state if they're negotiated.  Do not enable this
2440  * unless you know what you're doing */
2441 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2442 {
2443 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2444 	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2445 	struct ahc_tmode_tstate *tstate;
2446 	struct ahc_initiator_tinfo *tinfo
2447 		= ahc_fetch_transinfo(ahc,
2448 				      starget->channel + 'A',
2449 				      shost->this_id, starget->id, &tstate);
2450 	struct ahc_devinfo devinfo;
2451 	unsigned int ppr_options = tinfo->goal.ppr_options
2452 		& ~MSG_EXT_PPR_QAS_REQ;
2453 	unsigned int period = tinfo->goal.period;
2454 	unsigned long flags;
2455 	struct ahc_syncrate *syncrate;
2456 
2457 	if (qas)
2458 		ppr_options |= MSG_EXT_PPR_QAS_REQ;
2459 
2460 	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2461 			    starget->channel + 'A', ROLE_INITIATOR);
2462 	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2463 				     AHC_SYNCRATE_DT);
2464 	ahc_lock(ahc, &flags);
2465 	ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2466 			 ppr_options, AHC_TRANS_GOAL, FALSE);
2467 	ahc_unlock(ahc, &flags);
2468 }
2469 
2470 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2471 {
2472 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2473 	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2474 	struct ahc_tmode_tstate *tstate;
2475 	struct ahc_initiator_tinfo *tinfo
2476 		= ahc_fetch_transinfo(ahc,
2477 				      starget->channel + 'A',
2478 				      shost->this_id, starget->id, &tstate);
2479 	struct ahc_devinfo devinfo;
2480 	unsigned int ppr_options = tinfo->goal.ppr_options
2481 		& ~MSG_EXT_PPR_IU_REQ;
2482 	unsigned int period = tinfo->goal.period;
2483 	unsigned long flags;
2484 	struct ahc_syncrate *syncrate;
2485 
2486 	if (iu)
2487 		ppr_options |= MSG_EXT_PPR_IU_REQ;
2488 
2489 	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2490 			    starget->channel + 'A', ROLE_INITIATOR);
2491 	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2492 				     AHC_SYNCRATE_DT);
2493 	ahc_lock(ahc, &flags);
2494 	ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2495 			 ppr_options, AHC_TRANS_GOAL, FALSE);
2496 	ahc_unlock(ahc, &flags);
2497 }
2498 #endif
2499 
2500 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2501 {
2502 	struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2503 	unsigned long flags;
2504 	u8 mode;
2505 
2506 	if (!(ahc->features & AHC_ULTRA2)) {
2507 		/* non-LVD chipset, may not have SBLKCTL reg */
2508 		spi_signalling(shost) =
2509 			ahc->features & AHC_HVD ?
2510 			SPI_SIGNAL_HVD :
2511 			SPI_SIGNAL_SE;
2512 		return;
2513 	}
2514 
2515 	ahc_lock(ahc, &flags);
2516 	ahc_pause(ahc);
2517 	mode = ahc_inb(ahc, SBLKCTL);
2518 	ahc_unpause(ahc);
2519 	ahc_unlock(ahc, &flags);
2520 
2521 	if (mode & ENAB40)
2522 		spi_signalling(shost) = SPI_SIGNAL_LVD;
2523 	else if (mode & ENAB20)
2524 		spi_signalling(shost) = SPI_SIGNAL_SE;
2525 	else
2526 		spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2527 }
2528 
2529 static struct spi_function_template ahc_linux_transport_functions = {
2530 	.set_offset	= ahc_linux_set_offset,
2531 	.show_offset	= 1,
2532 	.set_period	= ahc_linux_set_period,
2533 	.show_period	= 1,
2534 	.set_width	= ahc_linux_set_width,
2535 	.show_width	= 1,
2536 	.set_dt		= ahc_linux_set_dt,
2537 	.show_dt	= 1,
2538 #if 0
2539 	.set_iu		= ahc_linux_set_iu,
2540 	.show_iu	= 1,
2541 	.set_qas	= ahc_linux_set_qas,
2542 	.show_qas	= 1,
2543 #endif
2544 	.get_signalling	= ahc_linux_get_signalling,
2545 };
2546 
2547 
2548 
2549 static int __init
2550 ahc_linux_init(void)
2551 {
2552 	/*
2553 	 * If we've been passed any parameters, process them now.
2554 	 */
2555 	if (aic7xxx)
2556 		aic7xxx_setup(aic7xxx);
2557 
2558 	ahc_linux_transport_template =
2559 		spi_attach_transport(&ahc_linux_transport_functions);
2560 	if (!ahc_linux_transport_template)
2561 		return -ENODEV;
2562 
2563 	scsi_transport_reserve_device(ahc_linux_transport_template,
2564 				      sizeof(struct ahc_linux_device));
2565 
2566 	ahc_linux_pci_init();
2567 	ahc_linux_eisa_init();
2568 	return 0;
2569 }
2570 
2571 static void
2572 ahc_linux_exit(void)
2573 {
2574 	ahc_linux_pci_exit();
2575 	ahc_linux_eisa_exit();
2576 	spi_release_transport(ahc_linux_transport_template);
2577 }
2578 
2579 module_init(ahc_linux_init);
2580 module_exit(ahc_linux_exit);
2581