1 /*
2  * Adaptec AIC79xx device driver for Linux.
3  *
4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm.c#171 $
5  *
6  * --------------------------------------------------------------------------
7  * Copyright (c) 1994-2000 Justin T. Gibbs.
8  * Copyright (c) 1997-1999 Doug Ledford
9  * Copyright (c) 2000-2003 Adaptec Inc.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44 
45 #include "aic79xx_osm.h"
46 #include "aic79xx_inline.h"
47 #include <scsi/scsicam.h>
48 
49 static struct scsi_transport_template *ahd_linux_transport_template = NULL;
50 
51 #include <linux/init.h>		/* __setup */
52 #include <linux/mm.h>		/* For fetching system memory size */
53 #include <linux/blkdev.h>		/* For block_size() */
54 #include <linux/delay.h>	/* For ssleep/msleep */
55 #include <linux/device.h>
56 #include <linux/slab.h>
57 
58 /*
59  * Bucket size for counting good commands in between bad ones.
60  */
61 #define AHD_LINUX_ERR_THRESH	1000
62 
63 /*
64  * Set this to the delay in seconds after SCSI bus reset.
65  * Note, we honor this only for the initial bus reset.
66  * The scsi error recovery code performs its own bus settle
67  * delay handling for error recovery actions.
68  */
69 #ifdef CONFIG_AIC79XX_RESET_DELAY_MS
70 #define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
71 #else
72 #define AIC79XX_RESET_DELAY 5000
73 #endif
74 
75 /*
76  * To change the default number of tagged transactions allowed per-device,
77  * add a line to the lilo.conf file like:
78  * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
79  * which will result in the first four devices on the first two
80  * controllers being set to a tagged queue depth of 32.
81  *
82  * The tag_commands is an array of 16 to allow for wide and twin adapters.
83  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
84  * for channel 1.
85  */
86 typedef struct {
87 	uint16_t tag_commands[16];	/* Allow for wide/twin adapters. */
88 } adapter_tag_info_t;
89 
90 /*
91  * Modify this as you see fit for your system.
92  *
93  * 0			tagged queuing disabled
94  * 1 <= n <= 253	n == max tags ever dispatched.
95  *
96  * The driver will throttle the number of commands dispatched to a
97  * device if it returns queue full.  For devices with a fixed maximum
98  * queue depth, the driver will eventually determine this depth and
99  * lock it in (a console message is printed to indicate that a lock
100  * has occurred).  On some devices, queue full is returned for a temporary
101  * resource shortage.  These devices will return queue full at varying
102  * depths.  The driver will throttle back when the queue fulls occur and
103  * attempt to slowly increase the depth over time as the device recovers
104  * from the resource shortage.
105  *
106  * In this example, the first line will disable tagged queueing for all
107  * the devices on the first probed aic79xx adapter.
108  *
109  * The second line enables tagged queueing with 4 commands/LUN for IDs
110  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
111  * driver to attempt to use up to 64 tags for ID 1.
112  *
113  * The third line is the same as the first line.
114  *
115  * The fourth line disables tagged queueing for devices 0 and 3.  It
116  * enables tagged queueing for the other IDs, with 16 commands/LUN
117  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
118  * IDs 2, 5-7, and 9-15.
119  */
120 
121 /*
122  * NOTE: The below structure is for reference only, the actual structure
123  *       to modify in order to change things is just below this comment block.
124 adapter_tag_info_t aic79xx_tag_info[] =
125 {
126 	{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
127 	{{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
128 	{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
129 	{{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
130 };
131 */
132 
133 #ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
134 #define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
135 #else
136 #define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
137 #endif
138 
139 #define AIC79XX_CONFIGED_TAG_COMMANDS {					\
140 	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
141 	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
142 	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
143 	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
144 	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
145 	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
146 	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
147 	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE		\
148 }
149 
150 /*
151  * By default, use the number of commands specified by
152  * the users kernel configuration.
153  */
154 static adapter_tag_info_t aic79xx_tag_info[] =
155 {
156 	{AIC79XX_CONFIGED_TAG_COMMANDS},
157 	{AIC79XX_CONFIGED_TAG_COMMANDS},
158 	{AIC79XX_CONFIGED_TAG_COMMANDS},
159 	{AIC79XX_CONFIGED_TAG_COMMANDS},
160 	{AIC79XX_CONFIGED_TAG_COMMANDS},
161 	{AIC79XX_CONFIGED_TAG_COMMANDS},
162 	{AIC79XX_CONFIGED_TAG_COMMANDS},
163 	{AIC79XX_CONFIGED_TAG_COMMANDS},
164 	{AIC79XX_CONFIGED_TAG_COMMANDS},
165 	{AIC79XX_CONFIGED_TAG_COMMANDS},
166 	{AIC79XX_CONFIGED_TAG_COMMANDS},
167 	{AIC79XX_CONFIGED_TAG_COMMANDS},
168 	{AIC79XX_CONFIGED_TAG_COMMANDS},
169 	{AIC79XX_CONFIGED_TAG_COMMANDS},
170 	{AIC79XX_CONFIGED_TAG_COMMANDS},
171 	{AIC79XX_CONFIGED_TAG_COMMANDS}
172 };
173 
174 /*
175  * The I/O cell on the chip is very configurable in respect to its analog
176  * characteristics.  Set the defaults here; they can be overriden with
177  * the proper insmod parameters.
178  */
179 struct ahd_linux_iocell_opts
180 {
181 	uint8_t	precomp;
182 	uint8_t	slewrate;
183 	uint8_t amplitude;
184 };
185 #define AIC79XX_DEFAULT_PRECOMP		0xFF
186 #define AIC79XX_DEFAULT_SLEWRATE	0xFF
187 #define AIC79XX_DEFAULT_AMPLITUDE	0xFF
188 #define AIC79XX_DEFAULT_IOOPTS			\
189 {						\
190 	AIC79XX_DEFAULT_PRECOMP,		\
191 	AIC79XX_DEFAULT_SLEWRATE,		\
192 	AIC79XX_DEFAULT_AMPLITUDE		\
193 }
194 #define AIC79XX_PRECOMP_INDEX	0
195 #define AIC79XX_SLEWRATE_INDEX	1
196 #define AIC79XX_AMPLITUDE_INDEX	2
197 static const struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
198 {
199 	AIC79XX_DEFAULT_IOOPTS,
200 	AIC79XX_DEFAULT_IOOPTS,
201 	AIC79XX_DEFAULT_IOOPTS,
202 	AIC79XX_DEFAULT_IOOPTS,
203 	AIC79XX_DEFAULT_IOOPTS,
204 	AIC79XX_DEFAULT_IOOPTS,
205 	AIC79XX_DEFAULT_IOOPTS,
206 	AIC79XX_DEFAULT_IOOPTS,
207 	AIC79XX_DEFAULT_IOOPTS,
208 	AIC79XX_DEFAULT_IOOPTS,
209 	AIC79XX_DEFAULT_IOOPTS,
210 	AIC79XX_DEFAULT_IOOPTS,
211 	AIC79XX_DEFAULT_IOOPTS,
212 	AIC79XX_DEFAULT_IOOPTS,
213 	AIC79XX_DEFAULT_IOOPTS,
214 	AIC79XX_DEFAULT_IOOPTS
215 };
216 
217 /*
218  * There should be a specific return value for this in scsi.h, but
219  * it seems that most drivers ignore it.
220  */
221 #define DID_UNDERFLOW   DID_ERROR
222 
223 void
224 ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
225 {
226 	printk("(scsi%d:%c:%d:%d): ",
227 	       ahd->platform_data->host->host_no,
228 	       scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
229 	       scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
230 	       scb != NULL ? SCB_GET_LUN(scb) : -1);
231 }
232 
233 /*
234  * XXX - these options apply unilaterally to _all_ adapters
235  *       cards in the system.  This should be fixed.  Exceptions to this
236  *       rule are noted in the comments.
237  */
238 
239 /*
240  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
241  * has no effect on any later resets that might occur due to things like
242  * SCSI bus timeouts.
243  */
244 static uint32_t aic79xx_no_reset;
245 
246 /*
247  * Should we force EXTENDED translation on a controller.
248  *     0 == Use whatever is in the SEEPROM or default to off
249  *     1 == Use whatever is in the SEEPROM or default to on
250  */
251 static uint32_t aic79xx_extended;
252 
253 /*
254  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
255  * dubious at best.  To my knowledge, this option has never actually
256  * solved a PCI parity problem, but on certain machines with broken PCI
257  * chipset configurations, it can generate tons of false error messages.
258  * It's included in the driver for completeness.
259  *   0	   = Shut off PCI parity check
260  *   non-0 = Enable PCI parity check
261  *
262  * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
263  * variable to -1 you would actually want to simply pass the variable
264  * name without a number.  That will invert the 0 which will result in
265  * -1.
266  */
267 static uint32_t aic79xx_pci_parity = ~0;
268 
269 /*
270  * There are lots of broken chipsets in the world.  Some of them will
271  * violate the PCI spec when we issue byte sized memory writes to our
272  * controller.  I/O mapped register access, if allowed by the given
273  * platform, will work in almost all cases.
274  */
275 uint32_t aic79xx_allow_memio = ~0;
276 
277 /*
278  * So that we can set how long each device is given as a selection timeout.
279  * The table of values goes like this:
280  *   0 - 256ms
281  *   1 - 128ms
282  *   2 - 64ms
283  *   3 - 32ms
284  * We default to 256ms because some older devices need a longer time
285  * to respond to initial selection.
286  */
287 static uint32_t aic79xx_seltime;
288 
289 /*
290  * Certain devices do not perform any aging on commands.  Should the
291  * device be saturated by commands in one portion of the disk, it is
292  * possible for transactions on far away sectors to never be serviced.
293  * To handle these devices, we can periodically send an ordered tag to
294  * force all outstanding transactions to be serviced prior to a new
295  * transaction.
296  */
297 static uint32_t aic79xx_periodic_otag;
298 
299 /* Some storage boxes are using an LSI chip which has a bug making it
300  * impossible to use aic79xx Rev B chip in 320 speeds.  The following
301  * storage boxes have been reported to be buggy:
302  * EonStor 3U 16-Bay: U16U-G3A3
303  * EonStor 2U 12-Bay: U12U-G3A3
304  * SentinelRAID: 2500F R5 / R6
305  * SentinelRAID: 2500F R1
306  * SentinelRAID: 2500F/1500F
307  * SentinelRAID: 150F
308  *
309  * To get around this LSI bug, you can set your board to 160 mode
310  * or you can enable the SLOWCRC bit.
311  */
312 uint32_t aic79xx_slowcrc;
313 
314 /*
315  * Module information and settable options.
316  */
317 static char *aic79xx = NULL;
318 
319 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
320 MODULE_DESCRIPTION("Adaptec AIC790X U320 SCSI Host Bus Adapter driver");
321 MODULE_LICENSE("Dual BSD/GPL");
322 MODULE_VERSION(AIC79XX_DRIVER_VERSION);
323 module_param(aic79xx, charp, 0444);
324 MODULE_PARM_DESC(aic79xx,
325 "period-delimited options string:\n"
326 "	verbose			Enable verbose/diagnostic logging\n"
327 "	allow_memio		Allow device registers to be memory mapped\n"
328 "	debug			Bitmask of debug values to enable\n"
329 "	no_reset		Suppress initial bus resets\n"
330 "	extended		Enable extended geometry on all controllers\n"
331 "	periodic_otag		Send an ordered tagged transaction\n"
332 "				periodically to prevent tag starvation.\n"
333 "				This may be required by some older disk\n"
334 "				or drives/RAID arrays.\n"
335 "	tag_info:<tag_str>	Set per-target tag depth\n"
336 "	global_tag_depth:<int>	Global tag depth for all targets on all buses\n"
337 "	slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
338 "	precomp:<pcomp_list>	Set the signal precompensation (0-7).\n"
339 "	amplitude:<int>		Set the signal amplitude (0-7).\n"
340 "	seltime:<int>		Selection Timeout:\n"
341 "				(0/256ms,1/128ms,2/64ms,3/32ms)\n"
342 "	slowcrc			Turn on the SLOWCRC bit (Rev B only)\n"
343 "\n"
344 "	Sample modprobe configuration file:\n"
345 "	#	Enable verbose logging\n"
346 "	#	Set tag depth on Controller 2/Target 2 to 10 tags\n"
347 "	#	Shorten the selection timeout to 128ms\n"
348 "\n"
349 "	options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
350 );
351 
352 static void ahd_linux_handle_scsi_status(struct ahd_softc *,
353 					 struct scsi_device *,
354 					 struct scb *);
355 static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
356 					 struct scsi_cmnd *cmd);
357 static int ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd);
358 static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
359 static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
360 				     struct ahd_devinfo *devinfo);
361 static void ahd_linux_device_queue_depth(struct scsi_device *);
362 static int ahd_linux_run_command(struct ahd_softc*,
363 				 struct ahd_linux_device *,
364 				 struct scsi_cmnd *);
365 static void ahd_linux_setup_tag_info_global(char *p);
366 static int  aic79xx_setup(char *c);
367 static void ahd_freeze_simq(struct ahd_softc *ahd);
368 static void ahd_release_simq(struct ahd_softc *ahd);
369 
370 static int ahd_linux_unit;
371 
372 
373 /************************** OS Utility Wrappers *******************************/
374 void ahd_delay(long);
375 void
376 ahd_delay(long usec)
377 {
378 	/*
379 	 * udelay on Linux can have problems for
380 	 * multi-millisecond waits.  Wait at most
381 	 * 1024us per call.
382 	 */
383 	while (usec > 0) {
384 		udelay(usec % 1024);
385 		usec -= 1024;
386 	}
387 }
388 
389 
390 /***************************** Low Level I/O **********************************/
391 uint8_t ahd_inb(struct ahd_softc * ahd, long port);
392 void ahd_outb(struct ahd_softc * ahd, long port, uint8_t val);
393 void ahd_outw_atomic(struct ahd_softc * ahd,
394 				     long port, uint16_t val);
395 void ahd_outsb(struct ahd_softc * ahd, long port,
396 			       uint8_t *, int count);
397 void ahd_insb(struct ahd_softc * ahd, long port,
398 			       uint8_t *, int count);
399 
400 uint8_t
401 ahd_inb(struct ahd_softc * ahd, long port)
402 {
403 	uint8_t x;
404 
405 	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
406 		x = readb(ahd->bshs[0].maddr + port);
407 	} else {
408 		x = inb(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
409 	}
410 	mb();
411 	return (x);
412 }
413 
414 #if 0 /* unused */
415 static uint16_t
416 ahd_inw_atomic(struct ahd_softc * ahd, long port)
417 {
418 	uint8_t x;
419 
420 	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
421 		x = readw(ahd->bshs[0].maddr + port);
422 	} else {
423 		x = inw(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
424 	}
425 	mb();
426 	return (x);
427 }
428 #endif
429 
430 void
431 ahd_outb(struct ahd_softc * ahd, long port, uint8_t val)
432 {
433 	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
434 		writeb(val, ahd->bshs[0].maddr + port);
435 	} else {
436 		outb(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
437 	}
438 	mb();
439 }
440 
441 void
442 ahd_outw_atomic(struct ahd_softc * ahd, long port, uint16_t val)
443 {
444 	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
445 		writew(val, ahd->bshs[0].maddr + port);
446 	} else {
447 		outw(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
448 	}
449 	mb();
450 }
451 
452 void
453 ahd_outsb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
454 {
455 	int i;
456 
457 	/*
458 	 * There is probably a more efficient way to do this on Linux
459 	 * but we don't use this for anything speed critical and this
460 	 * should work.
461 	 */
462 	for (i = 0; i < count; i++)
463 		ahd_outb(ahd, port, *array++);
464 }
465 
466 void
467 ahd_insb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
468 {
469 	int i;
470 
471 	/*
472 	 * There is probably a more efficient way to do this on Linux
473 	 * but we don't use this for anything speed critical and this
474 	 * should work.
475 	 */
476 	for (i = 0; i < count; i++)
477 		*array++ = ahd_inb(ahd, port);
478 }
479 
480 /******************************* PCI Routines *********************************/
481 uint32_t
482 ahd_pci_read_config(ahd_dev_softc_t pci, int reg, int width)
483 {
484 	switch (width) {
485 	case 1:
486 	{
487 		uint8_t retval;
488 
489 		pci_read_config_byte(pci, reg, &retval);
490 		return (retval);
491 	}
492 	case 2:
493 	{
494 		uint16_t retval;
495 		pci_read_config_word(pci, reg, &retval);
496 		return (retval);
497 	}
498 	case 4:
499 	{
500 		uint32_t retval;
501 		pci_read_config_dword(pci, reg, &retval);
502 		return (retval);
503 	}
504 	default:
505 		panic("ahd_pci_read_config: Read size too big");
506 		/* NOTREACHED */
507 		return (0);
508 	}
509 }
510 
511 void
512 ahd_pci_write_config(ahd_dev_softc_t pci, int reg, uint32_t value, int width)
513 {
514 	switch (width) {
515 	case 1:
516 		pci_write_config_byte(pci, reg, value);
517 		break;
518 	case 2:
519 		pci_write_config_word(pci, reg, value);
520 		break;
521 	case 4:
522 		pci_write_config_dword(pci, reg, value);
523 		break;
524 	default:
525 		panic("ahd_pci_write_config: Write size too big");
526 		/* NOTREACHED */
527 	}
528 }
529 
530 /****************************** Inlines ***************************************/
531 static void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
532 
533 static void
534 ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
535 {
536 	struct scsi_cmnd *cmd;
537 
538 	cmd = scb->io_ctx;
539 	ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
540 	scsi_dma_unmap(cmd);
541 }
542 
543 /******************************** Macros **************************************/
544 #define BUILD_SCSIID(ahd, cmd)						\
545 	(((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)
546 
547 /*
548  * Return a string describing the driver.
549  */
550 static const char *
551 ahd_linux_info(struct Scsi_Host *host)
552 {
553 	static char buffer[512];
554 	char	ahd_info[256];
555 	char   *bp;
556 	struct ahd_softc *ahd;
557 
558 	bp = &buffer[0];
559 	ahd = *(struct ahd_softc **)host->hostdata;
560 	memset(bp, 0, sizeof(buffer));
561 	strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev " AIC79XX_DRIVER_VERSION "\n"
562 			"        <");
563 	strcat(bp, ahd->description);
564 	strcat(bp, ">\n"
565 			"        ");
566 	ahd_controller_info(ahd, ahd_info);
567 	strcat(bp, ahd_info);
568 
569 	return (bp);
570 }
571 
572 /*
573  * Queue an SCB to the controller.
574  */
575 static int ahd_linux_queue_lck(struct scsi_cmnd *cmd)
576 {
577 	struct	 ahd_softc *ahd;
578 	struct	 ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
579 	int rtn = SCSI_MLQUEUE_HOST_BUSY;
580 
581 	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
582 
583 	cmd->result = CAM_REQ_INPROG << 16;
584 	rtn = ahd_linux_run_command(ahd, dev, cmd);
585 
586 	return rtn;
587 }
588 
589 static DEF_SCSI_QCMD(ahd_linux_queue)
590 
591 static struct scsi_target **
592 ahd_linux_target_in_softc(struct scsi_target *starget)
593 {
594 	struct	ahd_softc *ahd =
595 		*((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
596 	unsigned int target_offset;
597 
598 	target_offset = starget->id;
599 	if (starget->channel != 0)
600 		target_offset += 8;
601 
602 	return &ahd->platform_data->starget[target_offset];
603 }
604 
605 static int
606 ahd_linux_target_alloc(struct scsi_target *starget)
607 {
608 	struct	ahd_softc *ahd =
609 		*((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
610 	struct seeprom_config *sc = ahd->seep_config;
611 	unsigned long flags;
612 	struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
613 	struct ahd_devinfo devinfo;
614 	struct ahd_initiator_tinfo *tinfo;
615 	struct ahd_tmode_tstate *tstate;
616 	char channel = starget->channel + 'A';
617 
618 	ahd_lock(ahd, &flags);
619 
620 	BUG_ON(*ahd_targp != NULL);
621 
622 	*ahd_targp = starget;
623 
624 	if (sc) {
625 		int flags = sc->device_flags[starget->id];
626 
627 		tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
628 					    starget->id, &tstate);
629 
630 		if ((flags  & CFPACKETIZED) == 0) {
631 			/* don't negotiate packetized (IU) transfers */
632 			spi_max_iu(starget) = 0;
633 		} else {
634 			if ((ahd->features & AHD_RTI) == 0)
635 				spi_rti(starget) = 0;
636 		}
637 
638 		if ((flags & CFQAS) == 0)
639 			spi_max_qas(starget) = 0;
640 
641 		/* Transinfo values have been set to BIOS settings */
642 		spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
643 		spi_min_period(starget) = tinfo->user.period;
644 		spi_max_offset(starget) = tinfo->user.offset;
645 	}
646 
647 	tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
648 				    starget->id, &tstate);
649 	ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
650 			    CAM_LUN_WILDCARD, channel,
651 			    ROLE_INITIATOR);
652 	ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
653 			 AHD_TRANS_GOAL, /*paused*/FALSE);
654 	ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
655 		      AHD_TRANS_GOAL, /*paused*/FALSE);
656 	ahd_unlock(ahd, &flags);
657 
658 	return 0;
659 }
660 
661 static void
662 ahd_linux_target_destroy(struct scsi_target *starget)
663 {
664 	struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
665 
666 	*ahd_targp = NULL;
667 }
668 
669 static int
670 ahd_linux_slave_alloc(struct scsi_device *sdev)
671 {
672 	struct	ahd_softc *ahd =
673 		*((struct ahd_softc **)sdev->host->hostdata);
674 	struct ahd_linux_device *dev;
675 
676 	if (bootverbose)
677 		printk("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
678 
679 	dev = scsi_transport_device_data(sdev);
680 	memset(dev, 0, sizeof(*dev));
681 
682 	/*
683 	 * We start out life using untagged
684 	 * transactions of which we allow one.
685 	 */
686 	dev->openings = 1;
687 
688 	/*
689 	 * Set maxtags to 0.  This will be changed if we
690 	 * later determine that we are dealing with
691 	 * a tagged queuing capable device.
692 	 */
693 	dev->maxtags = 0;
694 
695 	return (0);
696 }
697 
698 static int
699 ahd_linux_slave_configure(struct scsi_device *sdev)
700 {
701 	if (bootverbose)
702 		sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
703 
704 	ahd_linux_device_queue_depth(sdev);
705 
706 	/* Initial Domain Validation */
707 	if (!spi_initial_dv(sdev->sdev_target))
708 		spi_dv_device(sdev);
709 
710 	return 0;
711 }
712 
713 #if defined(__i386__)
714 /*
715  * Return the disk geometry for the given SCSI device.
716  */
717 static int
718 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
719 		    sector_t capacity, int geom[])
720 {
721 	int	 heads;
722 	int	 sectors;
723 	int	 cylinders;
724 	int	 extended;
725 	struct	 ahd_softc *ahd;
726 
727 	ahd = *((struct ahd_softc **)sdev->host->hostdata);
728 
729 	if (scsi_partsize(bdev, capacity, geom))
730 		return 0;
731 
732 	heads = 64;
733 	sectors = 32;
734 	cylinders = aic_sector_div(capacity, heads, sectors);
735 
736 	if (aic79xx_extended != 0)
737 		extended = 1;
738 	else
739 		extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
740 	if (extended && cylinders >= 1024) {
741 		heads = 255;
742 		sectors = 63;
743 		cylinders = aic_sector_div(capacity, heads, sectors);
744 	}
745 	geom[0] = heads;
746 	geom[1] = sectors;
747 	geom[2] = cylinders;
748 	return (0);
749 }
750 #endif
751 
752 /*
753  * Abort the current SCSI command(s).
754  */
755 static int
756 ahd_linux_abort(struct scsi_cmnd *cmd)
757 {
758 	return ahd_linux_queue_abort_cmd(cmd);
759 }
760 
761 /*
762  * Attempt to send a target reset message to the device that timed out.
763  */
764 static int
765 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
766 {
767 	struct ahd_softc *ahd;
768 	struct ahd_linux_device *dev;
769 	struct scb *reset_scb;
770 	u_int  cdb_byte;
771 	int    retval = SUCCESS;
772 	struct	ahd_initiator_tinfo *tinfo;
773 	struct	ahd_tmode_tstate *tstate;
774 	unsigned long flags;
775 	DECLARE_COMPLETION_ONSTACK(done);
776 
777 	reset_scb = NULL;
778 
779 	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
780 
781 	scmd_printk(KERN_INFO, cmd,
782 		    "Attempting to queue a TARGET RESET message:");
783 
784 	printk("CDB:");
785 	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
786 		printk(" 0x%x", cmd->cmnd[cdb_byte]);
787 	printk("\n");
788 
789 	/*
790 	 * Determine if we currently own this command.
791 	 */
792 	dev = scsi_transport_device_data(cmd->device);
793 
794 	if (dev == NULL) {
795 		/*
796 		 * No target device for this command exists,
797 		 * so we must not still own the command.
798 		 */
799 		scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
800 		return SUCCESS;
801 	}
802 
803 	/*
804 	 * Generate us a new SCB
805 	 */
806 	reset_scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX);
807 	if (!reset_scb) {
808 		scmd_printk(KERN_INFO, cmd, "No SCB available\n");
809 		return FAILED;
810 	}
811 
812 	tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
813 				    cmd->device->id, &tstate);
814 	reset_scb->io_ctx = cmd;
815 	reset_scb->platform_data->dev = dev;
816 	reset_scb->sg_count = 0;
817 	ahd_set_residual(reset_scb, 0);
818 	ahd_set_sense_residual(reset_scb, 0);
819 	reset_scb->platform_data->xfer_len = 0;
820 	reset_scb->hscb->control = 0;
821 	reset_scb->hscb->scsiid = BUILD_SCSIID(ahd,cmd);
822 	reset_scb->hscb->lun = cmd->device->lun;
823 	reset_scb->hscb->cdb_len = 0;
824 	reset_scb->hscb->task_management = SIU_TASKMGMT_LUN_RESET;
825 	reset_scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
826 	if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
827 		reset_scb->flags |= SCB_PACKETIZED;
828 	} else {
829 		reset_scb->hscb->control |= MK_MESSAGE;
830 	}
831 	dev->openings--;
832 	dev->active++;
833 	dev->commands_issued++;
834 
835 	ahd_lock(ahd, &flags);
836 
837 	LIST_INSERT_HEAD(&ahd->pending_scbs, reset_scb, pending_links);
838 	ahd_queue_scb(ahd, reset_scb);
839 
840 	ahd->platform_data->eh_done = &done;
841 	ahd_unlock(ahd, &flags);
842 
843 	printk("%s: Device reset code sleeping\n", ahd_name(ahd));
844 	if (!wait_for_completion_timeout(&done, 5 * HZ)) {
845 		ahd_lock(ahd, &flags);
846 		ahd->platform_data->eh_done = NULL;
847 		ahd_unlock(ahd, &flags);
848 		printk("%s: Device reset timer expired (active %d)\n",
849 		       ahd_name(ahd), dev->active);
850 		retval = FAILED;
851 	}
852 	printk("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
853 
854 	return (retval);
855 }
856 
857 /*
858  * Reset the SCSI bus.
859  */
860 static int
861 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
862 {
863 	struct ahd_softc *ahd;
864 	int    found;
865 	unsigned long flags;
866 
867 	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
868 #ifdef AHD_DEBUG
869 	if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
870 		printk("%s: Bus reset called for cmd %p\n",
871 		       ahd_name(ahd), cmd);
872 #endif
873 	ahd_lock(ahd, &flags);
874 
875 	found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
876 				  /*initiate reset*/TRUE);
877 	ahd_unlock(ahd, &flags);
878 
879 	if (bootverbose)
880 		printk("%s: SCSI bus reset delivered. "
881 		       "%d SCBs aborted.\n", ahd_name(ahd), found);
882 
883 	return (SUCCESS);
884 }
885 
886 struct scsi_host_template aic79xx_driver_template = {
887 	.module			= THIS_MODULE,
888 	.name			= "aic79xx",
889 	.proc_name		= "aic79xx",
890 	.show_info		= ahd_linux_show_info,
891 	.write_info	 	= ahd_proc_write_seeprom,
892 	.info			= ahd_linux_info,
893 	.queuecommand		= ahd_linux_queue,
894 	.eh_abort_handler	= ahd_linux_abort,
895 	.eh_device_reset_handler = ahd_linux_dev_reset,
896 	.eh_bus_reset_handler	= ahd_linux_bus_reset,
897 #if defined(__i386__)
898 	.bios_param		= ahd_linux_biosparam,
899 #endif
900 	.can_queue		= AHD_MAX_QUEUE,
901 	.this_id		= -1,
902 	.max_sectors		= 8192,
903 	.cmd_per_lun		= 2,
904 	.slave_alloc		= ahd_linux_slave_alloc,
905 	.slave_configure	= ahd_linux_slave_configure,
906 	.target_alloc		= ahd_linux_target_alloc,
907 	.target_destroy		= ahd_linux_target_destroy,
908 };
909 
910 /******************************** Bus DMA *************************************/
911 int
912 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
913 		   bus_size_t alignment, bus_size_t boundary,
914 		   dma_addr_t lowaddr, dma_addr_t highaddr,
915 		   bus_dma_filter_t *filter, void *filterarg,
916 		   bus_size_t maxsize, int nsegments,
917 		   bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
918 {
919 	bus_dma_tag_t dmat;
920 
921 	dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
922 	if (dmat == NULL)
923 		return (ENOMEM);
924 
925 	/*
926 	 * Linux is very simplistic about DMA memory.  For now don't
927 	 * maintain all specification information.  Once Linux supplies
928 	 * better facilities for doing these operations, or the
929 	 * needs of this particular driver change, we might need to do
930 	 * more here.
931 	 */
932 	dmat->alignment = alignment;
933 	dmat->boundary = boundary;
934 	dmat->maxsize = maxsize;
935 	*ret_tag = dmat;
936 	return (0);
937 }
938 
939 void
940 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
941 {
942 	kfree(dmat);
943 }
944 
945 int
946 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
947 		 int flags, bus_dmamap_t *mapp)
948 {
949 	*vaddr = dma_alloc_coherent(&ahd->dev_softc->dev, dmat->maxsize, mapp,
950 				    GFP_ATOMIC);
951 	if (*vaddr == NULL)
952 		return (ENOMEM);
953 	return(0);
954 }
955 
956 void
957 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
958 		void* vaddr, bus_dmamap_t map)
959 {
960 	dma_free_coherent(&ahd->dev_softc->dev, dmat->maxsize, vaddr, map);
961 }
962 
963 int
964 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
965 		void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
966 		void *cb_arg, int flags)
967 {
968 	/*
969 	 * Assume for now that this will only be used during
970 	 * initialization and not for per-transaction buffer mapping.
971 	 */
972 	bus_dma_segment_t stack_sg;
973 
974 	stack_sg.ds_addr = map;
975 	stack_sg.ds_len = dmat->maxsize;
976 	cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
977 	return (0);
978 }
979 
980 void
981 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
982 {
983 }
984 
985 int
986 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
987 {
988 	/* Nothing to do */
989 	return (0);
990 }
991 
992 /********************* Platform Dependent Functions ***************************/
993 static void
994 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
995 {
996 
997 	if ((instance >= 0)
998 	 && (instance < ARRAY_SIZE(aic79xx_iocell_info))) {
999 		uint8_t *iocell_info;
1000 
1001 		iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
1002 		iocell_info[index] = value & 0xFFFF;
1003 		if (bootverbose)
1004 			printk("iocell[%d:%ld] = %d\n", instance, index, value);
1005 	}
1006 }
1007 
1008 static void
1009 ahd_linux_setup_tag_info_global(char *p)
1010 {
1011 	int tags, i, j;
1012 
1013 	tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1014 	printk("Setting Global Tags= %d\n", tags);
1015 
1016 	for (i = 0; i < ARRAY_SIZE(aic79xx_tag_info); i++) {
1017 		for (j = 0; j < AHD_NUM_TARGETS; j++) {
1018 			aic79xx_tag_info[i].tag_commands[j] = tags;
1019 		}
1020 	}
1021 }
1022 
1023 static void
1024 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1025 {
1026 
1027 	if ((instance >= 0) && (targ >= 0)
1028 	 && (instance < ARRAY_SIZE(aic79xx_tag_info))
1029 	 && (targ < AHD_NUM_TARGETS)) {
1030 		aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
1031 		if (bootverbose)
1032 			printk("tag_info[%d:%d] = %d\n", instance, targ, value);
1033 	}
1034 }
1035 
1036 static char *
1037 ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
1038 		       void (*callback)(u_long, int, int, int32_t),
1039 		       u_long callback_arg)
1040 {
1041 	char	*tok_end;
1042 	char	*tok_end2;
1043 	int      i;
1044 	int      instance;
1045 	int	 targ;
1046 	int	 done;
1047 	char	 tok_list[] = {'.', ',', '{', '}', '\0'};
1048 
1049 	/* All options use a ':' name/arg separator */
1050 	if (*opt_arg != ':')
1051 		return (opt_arg);
1052 	opt_arg++;
1053 	instance = -1;
1054 	targ = -1;
1055 	done = FALSE;
1056 	/*
1057 	 * Restore separator that may be in
1058 	 * the middle of our option argument.
1059 	 */
1060 	tok_end = strchr(opt_arg, '\0');
1061 	if (tok_end < end)
1062 		*tok_end = ',';
1063 	while (!done) {
1064 		switch (*opt_arg) {
1065 		case '{':
1066 			if (instance == -1) {
1067 				instance = 0;
1068 			} else {
1069 				if (depth > 1) {
1070 					if (targ == -1)
1071 						targ = 0;
1072 				} else {
1073 					printk("Malformed Option %s\n",
1074 					       opt_name);
1075 					done = TRUE;
1076 				}
1077 			}
1078 			opt_arg++;
1079 			break;
1080 		case '}':
1081 			if (targ != -1)
1082 				targ = -1;
1083 			else if (instance != -1)
1084 				instance = -1;
1085 			opt_arg++;
1086 			break;
1087 		case ',':
1088 		case '.':
1089 			if (instance == -1)
1090 				done = TRUE;
1091 			else if (targ >= 0)
1092 				targ++;
1093 			else if (instance >= 0)
1094 				instance++;
1095 			opt_arg++;
1096 			break;
1097 		case '\0':
1098 			done = TRUE;
1099 			break;
1100 		default:
1101 			tok_end = end;
1102 			for (i = 0; tok_list[i]; i++) {
1103 				tok_end2 = strchr(opt_arg, tok_list[i]);
1104 				if ((tok_end2) && (tok_end2 < tok_end))
1105 					tok_end = tok_end2;
1106 			}
1107 			callback(callback_arg, instance, targ,
1108 				 simple_strtol(opt_arg, NULL, 0));
1109 			opt_arg = tok_end;
1110 			break;
1111 		}
1112 	}
1113 	return (opt_arg);
1114 }
1115 
1116 /*
1117  * Handle Linux boot parameters. This routine allows for assigning a value
1118  * to a parameter with a ':' between the parameter and the value.
1119  * ie. aic79xx=stpwlev:1,extended
1120  */
1121 static int
1122 aic79xx_setup(char *s)
1123 {
1124 	int	i, n;
1125 	char   *p;
1126 	char   *end;
1127 
1128 	static const struct {
1129 		const char *name;
1130 		uint32_t *flag;
1131 	} options[] = {
1132 		{ "extended", &aic79xx_extended },
1133 		{ "no_reset", &aic79xx_no_reset },
1134 		{ "verbose", &aic79xx_verbose },
1135 		{ "allow_memio", &aic79xx_allow_memio},
1136 #ifdef AHD_DEBUG
1137 		{ "debug", &ahd_debug },
1138 #endif
1139 		{ "periodic_otag", &aic79xx_periodic_otag },
1140 		{ "pci_parity", &aic79xx_pci_parity },
1141 		{ "seltime", &aic79xx_seltime },
1142 		{ "tag_info", NULL },
1143 		{ "global_tag_depth", NULL},
1144 		{ "slewrate", NULL },
1145 		{ "precomp", NULL },
1146 		{ "amplitude", NULL },
1147 		{ "slowcrc", &aic79xx_slowcrc },
1148 	};
1149 
1150 	end = strchr(s, '\0');
1151 
1152 	/*
1153 	 * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1154 	 * will never be 0 in this case.
1155 	 */
1156 	n = 0;
1157 
1158 	while ((p = strsep(&s, ",.")) != NULL) {
1159 		if (*p == '\0')
1160 			continue;
1161 		for (i = 0; i < ARRAY_SIZE(options); i++) {
1162 
1163 			n = strlen(options[i].name);
1164 			if (strncmp(options[i].name, p, n) == 0)
1165 				break;
1166 		}
1167 		if (i == ARRAY_SIZE(options))
1168 			continue;
1169 
1170 		if (strncmp(p, "global_tag_depth", n) == 0) {
1171 			ahd_linux_setup_tag_info_global(p + n);
1172 		} else if (strncmp(p, "tag_info", n) == 0) {
1173 			s = ahd_parse_brace_option("tag_info", p + n, end,
1174 			    2, ahd_linux_setup_tag_info, 0);
1175 		} else if (strncmp(p, "slewrate", n) == 0) {
1176 			s = ahd_parse_brace_option("slewrate",
1177 			    p + n, end, 1, ahd_linux_setup_iocell_info,
1178 			    AIC79XX_SLEWRATE_INDEX);
1179 		} else if (strncmp(p, "precomp", n) == 0) {
1180 			s = ahd_parse_brace_option("precomp",
1181 			    p + n, end, 1, ahd_linux_setup_iocell_info,
1182 			    AIC79XX_PRECOMP_INDEX);
1183 		} else if (strncmp(p, "amplitude", n) == 0) {
1184 			s = ahd_parse_brace_option("amplitude",
1185 			    p + n, end, 1, ahd_linux_setup_iocell_info,
1186 			    AIC79XX_AMPLITUDE_INDEX);
1187 		} else if (p[n] == ':') {
1188 			*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1189 		} else if (!strncmp(p, "verbose", n)) {
1190 			*(options[i].flag) = 1;
1191 		} else {
1192 			*(options[i].flag) ^= 0xFFFFFFFF;
1193 		}
1194 	}
1195 	return 1;
1196 }
1197 
1198 __setup("aic79xx=", aic79xx_setup);
1199 
1200 uint32_t aic79xx_verbose;
1201 
1202 int
1203 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
1204 {
1205 	char	buf[80];
1206 	struct	Scsi_Host *host;
1207 	char	*new_name;
1208 	u_long	s;
1209 	int	retval;
1210 
1211 	template->name = ahd->description;
1212 	host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1213 	if (host == NULL)
1214 		return (ENOMEM);
1215 
1216 	*((struct ahd_softc **)host->hostdata) = ahd;
1217 	ahd->platform_data->host = host;
1218 	host->can_queue = AHD_MAX_QUEUE;
1219 	host->cmd_per_lun = 2;
1220 	host->sg_tablesize = AHD_NSEG;
1221 	host->this_id = ahd->our_id;
1222 	host->irq = ahd->platform_data->irq;
1223 	host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1224 	host->max_lun = AHD_NUM_LUNS;
1225 	host->max_channel = 0;
1226 	host->sg_tablesize = AHD_NSEG;
1227 	ahd_lock(ahd, &s);
1228 	ahd_set_unit(ahd, ahd_linux_unit++);
1229 	ahd_unlock(ahd, &s);
1230 	sprintf(buf, "scsi%d", host->host_no);
1231 	new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1232 	if (new_name != NULL) {
1233 		strcpy(new_name, buf);
1234 		ahd_set_name(ahd, new_name);
1235 	}
1236 	host->unique_id = ahd->unit;
1237 	ahd_linux_initialize_scsi_bus(ahd);
1238 	ahd_intr_enable(ahd, TRUE);
1239 
1240 	host->transportt = ahd_linux_transport_template;
1241 
1242 	retval = scsi_add_host(host, &ahd->dev_softc->dev);
1243 	if (retval) {
1244 		printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
1245 		scsi_host_put(host);
1246 		return retval;
1247 	}
1248 
1249 	scsi_scan_host(host);
1250 	return 0;
1251 }
1252 
1253 /*
1254  * Place the SCSI bus into a known state by either resetting it,
1255  * or forcing transfer negotiations on the next command to any
1256  * target.
1257  */
1258 static void
1259 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1260 {
1261 	u_int target_id;
1262 	u_int numtarg;
1263 	unsigned long s;
1264 
1265 	target_id = 0;
1266 	numtarg = 0;
1267 
1268 	if (aic79xx_no_reset != 0)
1269 		ahd->flags &= ~AHD_RESET_BUS_A;
1270 
1271 	if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1272 		ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1273 	else
1274 		numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1275 
1276 	ahd_lock(ahd, &s);
1277 
1278 	/*
1279 	 * Force negotiation to async for all targets that
1280 	 * will not see an initial bus reset.
1281 	 */
1282 	for (; target_id < numtarg; target_id++) {
1283 		struct ahd_devinfo devinfo;
1284 		struct ahd_initiator_tinfo *tinfo;
1285 		struct ahd_tmode_tstate *tstate;
1286 
1287 		tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1288 					    target_id, &tstate);
1289 		ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1290 				    CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1291 		ahd_update_neg_request(ahd, &devinfo, tstate,
1292 				       tinfo, AHD_NEG_ALWAYS);
1293 	}
1294 	ahd_unlock(ahd, &s);
1295 	/* Give the bus some time to recover */
1296 	if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1297 		ahd_freeze_simq(ahd);
1298 		msleep(AIC79XX_RESET_DELAY);
1299 		ahd_release_simq(ahd);
1300 	}
1301 }
1302 
1303 int
1304 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1305 {
1306 	ahd->platform_data =
1307 	    kzalloc(sizeof(struct ahd_platform_data), GFP_ATOMIC);
1308 	if (ahd->platform_data == NULL)
1309 		return (ENOMEM);
1310 	ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1311 	ahd_lockinit(ahd);
1312 	ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1313 	return (0);
1314 }
1315 
1316 void
1317 ahd_platform_free(struct ahd_softc *ahd)
1318 {
1319 	struct scsi_target *starget;
1320 	int i;
1321 
1322 	if (ahd->platform_data != NULL) {
1323 		/* destroy all of the device and target objects */
1324 		for (i = 0; i < AHD_NUM_TARGETS; i++) {
1325 			starget = ahd->platform_data->starget[i];
1326 			if (starget != NULL) {
1327 				ahd->platform_data->starget[i] = NULL;
1328 			}
1329 		}
1330 
1331 		if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1332 			free_irq(ahd->platform_data->irq, ahd);
1333 		if (ahd->tags[0] == BUS_SPACE_PIO
1334 		 && ahd->bshs[0].ioport != 0)
1335 			release_region(ahd->bshs[0].ioport, 256);
1336 		if (ahd->tags[1] == BUS_SPACE_PIO
1337 		 && ahd->bshs[1].ioport != 0)
1338 			release_region(ahd->bshs[1].ioport, 256);
1339 		if (ahd->tags[0] == BUS_SPACE_MEMIO
1340 		 && ahd->bshs[0].maddr != NULL) {
1341 			iounmap(ahd->bshs[0].maddr);
1342 			release_mem_region(ahd->platform_data->mem_busaddr,
1343 					   0x1000);
1344 		}
1345 		if (ahd->platform_data->host)
1346 			scsi_host_put(ahd->platform_data->host);
1347 
1348 		kfree(ahd->platform_data);
1349 	}
1350 }
1351 
1352 void
1353 ahd_platform_init(struct ahd_softc *ahd)
1354 {
1355 	/*
1356 	 * Lookup and commit any modified IO Cell options.
1357 	 */
1358 	if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
1359 		const struct ahd_linux_iocell_opts *iocell_opts;
1360 
1361 		iocell_opts = &aic79xx_iocell_info[ahd->unit];
1362 		if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1363 			AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1364 		if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1365 			AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1366 		if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1367 			AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1368 	}
1369 
1370 }
1371 
1372 void
1373 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1374 {
1375 	ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1376 				SCB_GET_CHANNEL(ahd, scb),
1377 				SCB_GET_LUN(scb), SCB_LIST_NULL,
1378 				ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1379 }
1380 
1381 void
1382 ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
1383 		      struct ahd_devinfo *devinfo, ahd_queue_alg alg)
1384 {
1385 	struct ahd_linux_device *dev;
1386 	int was_queuing;
1387 	int now_queuing;
1388 
1389 	if (sdev == NULL)
1390 		return;
1391 
1392 	dev = scsi_transport_device_data(sdev);
1393 
1394 	if (dev == NULL)
1395 		return;
1396 	was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1397 	switch (alg) {
1398 	default:
1399 	case AHD_QUEUE_NONE:
1400 		now_queuing = 0;
1401 		break;
1402 	case AHD_QUEUE_BASIC:
1403 		now_queuing = AHD_DEV_Q_BASIC;
1404 		break;
1405 	case AHD_QUEUE_TAGGED:
1406 		now_queuing = AHD_DEV_Q_TAGGED;
1407 		break;
1408 	}
1409 	if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1410 	 && (was_queuing != now_queuing)
1411 	 && (dev->active != 0)) {
1412 		dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1413 		dev->qfrozen++;
1414 	}
1415 
1416 	dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1417 	if (now_queuing) {
1418 		u_int usertags;
1419 
1420 		usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1421 		if (!was_queuing) {
1422 			/*
1423 			 * Start out aggressively and allow our
1424 			 * dynamic queue depth algorithm to take
1425 			 * care of the rest.
1426 			 */
1427 			dev->maxtags = usertags;
1428 			dev->openings = dev->maxtags - dev->active;
1429 		}
1430 		if (dev->maxtags == 0) {
1431 			/*
1432 			 * Queueing is disabled by the user.
1433 			 */
1434 			dev->openings = 1;
1435 		} else if (alg == AHD_QUEUE_TAGGED) {
1436 			dev->flags |= AHD_DEV_Q_TAGGED;
1437 			if (aic79xx_periodic_otag != 0)
1438 				dev->flags |= AHD_DEV_PERIODIC_OTAG;
1439 		} else
1440 			dev->flags |= AHD_DEV_Q_BASIC;
1441 	} else {
1442 		/* We can only have one opening. */
1443 		dev->maxtags = 0;
1444 		dev->openings =  1 - dev->active;
1445 	}
1446 
1447 	switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1448 	case AHD_DEV_Q_BASIC:
1449 	case AHD_DEV_Q_TAGGED:
1450 		scsi_change_queue_depth(sdev,
1451 				dev->openings + dev->active);
1452 		break;
1453 	default:
1454 		/*
1455 		 * We allow the OS to queue 2 untagged transactions to
1456 		 * us at any time even though we can only execute them
1457 		 * serially on the controller/device.  This should
1458 		 * remove some latency.
1459 		 */
1460 		scsi_change_queue_depth(sdev, 1);
1461 		break;
1462 	}
1463 }
1464 
1465 int
1466 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1467 			int lun, u_int tag, role_t role, uint32_t status)
1468 {
1469 	return 0;
1470 }
1471 
1472 static u_int
1473 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1474 {
1475 	static int warned_user;
1476 	u_int tags;
1477 
1478 	tags = 0;
1479 	if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1480 		if (ahd->unit >= ARRAY_SIZE(aic79xx_tag_info)) {
1481 
1482 			if (warned_user == 0) {
1483 				printk(KERN_WARNING
1484 "aic79xx: WARNING: Insufficient tag_info instances\n"
1485 "aic79xx: for installed controllers.  Using defaults\n"
1486 "aic79xx: Please update the aic79xx_tag_info array in\n"
1487 "aic79xx: the aic79xx_osm.c source file.\n");
1488 				warned_user++;
1489 			}
1490 			tags = AHD_MAX_QUEUE;
1491 		} else {
1492 			adapter_tag_info_t *tag_info;
1493 
1494 			tag_info = &aic79xx_tag_info[ahd->unit];
1495 			tags = tag_info->tag_commands[devinfo->target_offset];
1496 			if (tags > AHD_MAX_QUEUE)
1497 				tags = AHD_MAX_QUEUE;
1498 		}
1499 	}
1500 	return (tags);
1501 }
1502 
1503 /*
1504  * Determines the queue depth for a given device.
1505  */
1506 static void
1507 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1508 {
1509 	struct	ahd_devinfo devinfo;
1510 	u_int	tags;
1511 	struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1512 
1513 	ahd_compile_devinfo(&devinfo,
1514 			    ahd->our_id,
1515 			    sdev->sdev_target->id, sdev->lun,
1516 			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
1517 			    ROLE_INITIATOR);
1518 	tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1519 	if (tags != 0 && sdev->tagged_supported != 0) {
1520 
1521 		ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_TAGGED);
1522 		ahd_send_async(ahd, devinfo.channel, devinfo.target,
1523 			       devinfo.lun, AC_TRANSFER_NEG);
1524 		ahd_print_devinfo(ahd, &devinfo);
1525 		printk("Tagged Queuing enabled.  Depth %d\n", tags);
1526 	} else {
1527 		ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_NONE);
1528 		ahd_send_async(ahd, devinfo.channel, devinfo.target,
1529 			       devinfo.lun, AC_TRANSFER_NEG);
1530 	}
1531 }
1532 
1533 static int
1534 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1535 		      struct scsi_cmnd *cmd)
1536 {
1537 	struct	 scb *scb;
1538 	struct	 hardware_scb *hscb;
1539 	struct	 ahd_initiator_tinfo *tinfo;
1540 	struct	 ahd_tmode_tstate *tstate;
1541 	u_int	 col_idx;
1542 	uint16_t mask;
1543 	unsigned long flags;
1544 	int nseg;
1545 
1546 	nseg = scsi_dma_map(cmd);
1547 	if (nseg < 0)
1548 		return SCSI_MLQUEUE_HOST_BUSY;
1549 
1550 	ahd_lock(ahd, &flags);
1551 
1552 	/*
1553 	 * Get an scb to use.
1554 	 */
1555 	tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1556 				    cmd->device->id, &tstate);
1557 	if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1558 	 || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1559 		col_idx = AHD_NEVER_COL_IDX;
1560 	} else {
1561 		col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1562 					    cmd->device->lun);
1563 	}
1564 	if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1565 		ahd->flags |= AHD_RESOURCE_SHORTAGE;
1566 		ahd_unlock(ahd, &flags);
1567 		scsi_dma_unmap(cmd);
1568 		return SCSI_MLQUEUE_HOST_BUSY;
1569 	}
1570 
1571 	scb->io_ctx = cmd;
1572 	scb->platform_data->dev = dev;
1573 	hscb = scb->hscb;
1574 	cmd->host_scribble = (char *)scb;
1575 
1576 	/*
1577 	 * Fill out basics of the HSCB.
1578 	 */
1579 	hscb->control = 0;
1580 	hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1581 	hscb->lun = cmd->device->lun;
1582 	scb->hscb->task_management = 0;
1583 	mask = SCB_GET_TARGET_MASK(ahd, scb);
1584 
1585 	if ((ahd->user_discenable & mask) != 0)
1586 		hscb->control |= DISCENB;
1587 
1588 	if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1589 		scb->flags |= SCB_PACKETIZED;
1590 
1591 	if ((tstate->auto_negotiate & mask) != 0) {
1592 		scb->flags |= SCB_AUTO_NEGOTIATE;
1593 		scb->hscb->control |= MK_MESSAGE;
1594 	}
1595 
1596 	if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1597 		if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1598 		 && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1599 			hscb->control |= ORDERED_QUEUE_TAG;
1600 			dev->commands_since_idle_or_otag = 0;
1601 		} else {
1602 			hscb->control |= SIMPLE_QUEUE_TAG;
1603 		}
1604 	}
1605 
1606 	hscb->cdb_len = cmd->cmd_len;
1607 	memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1608 
1609 	scb->platform_data->xfer_len = 0;
1610 	ahd_set_residual(scb, 0);
1611 	ahd_set_sense_residual(scb, 0);
1612 	scb->sg_count = 0;
1613 
1614 	if (nseg > 0) {
1615 		void *sg = scb->sg_list;
1616 		struct scatterlist *cur_seg;
1617 		int i;
1618 
1619 		scb->platform_data->xfer_len = 0;
1620 
1621 		scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1622 			dma_addr_t addr;
1623 			bus_size_t len;
1624 
1625 			addr = sg_dma_address(cur_seg);
1626 			len = sg_dma_len(cur_seg);
1627 			scb->platform_data->xfer_len += len;
1628 			sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1629 					  i == (nseg - 1));
1630 		}
1631 	}
1632 
1633 	LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1634 	dev->openings--;
1635 	dev->active++;
1636 	dev->commands_issued++;
1637 
1638 	if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1639 		dev->commands_since_idle_or_otag++;
1640 	scb->flags |= SCB_ACTIVE;
1641 	ahd_queue_scb(ahd, scb);
1642 
1643 	ahd_unlock(ahd, &flags);
1644 
1645 	return 0;
1646 }
1647 
1648 /*
1649  * SCSI controller interrupt handler.
1650  */
1651 irqreturn_t
1652 ahd_linux_isr(int irq, void *dev_id)
1653 {
1654 	struct	ahd_softc *ahd;
1655 	u_long	flags;
1656 	int	ours;
1657 
1658 	ahd = (struct ahd_softc *) dev_id;
1659 	ahd_lock(ahd, &flags);
1660 	ours = ahd_intr(ahd);
1661 	ahd_unlock(ahd, &flags);
1662 	return IRQ_RETVAL(ours);
1663 }
1664 
1665 void
1666 ahd_send_async(struct ahd_softc *ahd, char channel,
1667 	       u_int target, u_int lun, ac_code code)
1668 {
1669 	switch (code) {
1670 	case AC_TRANSFER_NEG:
1671 	{
1672 		struct  scsi_target *starget;
1673 		struct	ahd_initiator_tinfo *tinfo;
1674 		struct	ahd_tmode_tstate *tstate;
1675 		unsigned int target_ppr_options;
1676 
1677 		BUG_ON(target == CAM_TARGET_WILDCARD);
1678 
1679 		tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1680 					    target, &tstate);
1681 
1682 		/*
1683 		 * Don't bother reporting results while
1684 		 * negotiations are still pending.
1685 		 */
1686 		if (tinfo->curr.period != tinfo->goal.period
1687 		 || tinfo->curr.width != tinfo->goal.width
1688 		 || tinfo->curr.offset != tinfo->goal.offset
1689 		 || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1690 			if (bootverbose == 0)
1691 				break;
1692 
1693 		/*
1694 		 * Don't bother reporting results that
1695 		 * are identical to those last reported.
1696 		 */
1697 		starget = ahd->platform_data->starget[target];
1698 		if (starget == NULL)
1699 			break;
1700 
1701 		target_ppr_options =
1702 			(spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1703 			+ (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1704 			+ (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1705 			+ (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1706 			+ (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1707 			+ (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1708 			+ (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1709 			+ (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1710 
1711 		if (tinfo->curr.period == spi_period(starget)
1712 		    && tinfo->curr.width == spi_width(starget)
1713 		    && tinfo->curr.offset == spi_offset(starget)
1714 		 && tinfo->curr.ppr_options == target_ppr_options)
1715 			if (bootverbose == 0)
1716 				break;
1717 
1718 		spi_period(starget) = tinfo->curr.period;
1719 		spi_width(starget) = tinfo->curr.width;
1720 		spi_offset(starget) = tinfo->curr.offset;
1721 		spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1722 		spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1723 		spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1724 		spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1725 		spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1726 		spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1727 		spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1728 		spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1729 		spi_display_xfer_agreement(starget);
1730 		break;
1731 	}
1732         case AC_SENT_BDR:
1733 	{
1734 		WARN_ON(lun != CAM_LUN_WILDCARD);
1735 		scsi_report_device_reset(ahd->platform_data->host,
1736 					 channel - 'A', target);
1737 		break;
1738 	}
1739         case AC_BUS_RESET:
1740 		if (ahd->platform_data->host != NULL) {
1741 			scsi_report_bus_reset(ahd->platform_data->host,
1742 					      channel - 'A');
1743 		}
1744                 break;
1745         default:
1746                 panic("ahd_send_async: Unexpected async event");
1747         }
1748 }
1749 
1750 /*
1751  * Calls the higher level scsi done function and frees the scb.
1752  */
1753 void
1754 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1755 {
1756 	struct scsi_cmnd *cmd;
1757 	struct	  ahd_linux_device *dev;
1758 
1759 	if ((scb->flags & SCB_ACTIVE) == 0) {
1760 		printk("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1761 		ahd_dump_card_state(ahd);
1762 		panic("Stopping for safety");
1763 	}
1764 	LIST_REMOVE(scb, pending_links);
1765 	cmd = scb->io_ctx;
1766 	dev = scb->platform_data->dev;
1767 	dev->active--;
1768 	dev->openings++;
1769 	if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1770 		cmd->result &= ~(CAM_DEV_QFRZN << 16);
1771 		dev->qfrozen--;
1772 	}
1773 	ahd_linux_unmap_scb(ahd, scb);
1774 
1775 	/*
1776 	 * Guard against stale sense data.
1777 	 * The Linux mid-layer assumes that sense
1778 	 * was retrieved anytime the first byte of
1779 	 * the sense buffer looks "sane".
1780 	 */
1781 	cmd->sense_buffer[0] = 0;
1782 	if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1783 #ifdef AHD_REPORT_UNDERFLOWS
1784 		uint32_t amount_xferred;
1785 
1786 		amount_xferred =
1787 		    ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1788 #endif
1789 		if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1790 #ifdef AHD_DEBUG
1791 			if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1792 				ahd_print_path(ahd, scb);
1793 				printk("Set CAM_UNCOR_PARITY\n");
1794 			}
1795 #endif
1796 			ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1797 #ifdef AHD_REPORT_UNDERFLOWS
1798 		/*
1799 		 * This code is disabled by default as some
1800 		 * clients of the SCSI system do not properly
1801 		 * initialize the underflow parameter.  This
1802 		 * results in spurious termination of commands
1803 		 * that complete as expected (e.g. underflow is
1804 		 * allowed as command can return variable amounts
1805 		 * of data.
1806 		 */
1807 		} else if (amount_xferred < scb->io_ctx->underflow) {
1808 			u_int i;
1809 
1810 			ahd_print_path(ahd, scb);
1811 			printk("CDB:");
1812 			for (i = 0; i < scb->io_ctx->cmd_len; i++)
1813 				printk(" 0x%x", scb->io_ctx->cmnd[i]);
1814 			printk("\n");
1815 			ahd_print_path(ahd, scb);
1816 			printk("Saw underflow (%ld of %ld bytes). "
1817 			       "Treated as error\n",
1818 				ahd_get_residual(scb),
1819 				ahd_get_transfer_length(scb));
1820 			ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1821 #endif
1822 		} else {
1823 			ahd_set_transaction_status(scb, CAM_REQ_CMP);
1824 		}
1825 	} else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1826 		ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1827 	}
1828 
1829 	if (dev->openings == 1
1830 	 && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1831 	 && ahd_get_scsi_status(scb) != SAM_STAT_TASK_SET_FULL)
1832 		dev->tag_success_count++;
1833 	/*
1834 	 * Some devices deal with temporary internal resource
1835 	 * shortages by returning queue full.  When the queue
1836 	 * full occurrs, we throttle back.  Slowly try to get
1837 	 * back to our previous queue depth.
1838 	 */
1839 	if ((dev->openings + dev->active) < dev->maxtags
1840 	 && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1841 		dev->tag_success_count = 0;
1842 		dev->openings++;
1843 	}
1844 
1845 	if (dev->active == 0)
1846 		dev->commands_since_idle_or_otag = 0;
1847 
1848 	if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1849 		printk("Recovery SCB completes\n");
1850 		if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1851 		 || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1852 			ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1853 
1854 		if (ahd->platform_data->eh_done)
1855 			complete(ahd->platform_data->eh_done);
1856 	}
1857 
1858 	ahd_free_scb(ahd, scb);
1859 	ahd_linux_queue_cmd_complete(ahd, cmd);
1860 }
1861 
1862 static void
1863 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1864 			     struct scsi_device *sdev, struct scb *scb)
1865 {
1866 	struct	ahd_devinfo devinfo;
1867 	struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1868 
1869 	ahd_compile_devinfo(&devinfo,
1870 			    ahd->our_id,
1871 			    sdev->sdev_target->id, sdev->lun,
1872 			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
1873 			    ROLE_INITIATOR);
1874 
1875 	/*
1876 	 * We don't currently trust the mid-layer to
1877 	 * properly deal with queue full or busy.  So,
1878 	 * when one occurs, we tell the mid-layer to
1879 	 * unconditionally requeue the command to us
1880 	 * so that we can retry it ourselves.  We also
1881 	 * implement our own throttling mechanism so
1882 	 * we don't clobber the device with too many
1883 	 * commands.
1884 	 */
1885 	switch (ahd_get_scsi_status(scb)) {
1886 	default:
1887 		break;
1888 	case SAM_STAT_CHECK_CONDITION:
1889 	case SAM_STAT_COMMAND_TERMINATED:
1890 	{
1891 		struct scsi_cmnd *cmd;
1892 
1893 		/*
1894 		 * Copy sense information to the OS's cmd
1895 		 * structure if it is available.
1896 		 */
1897 		cmd = scb->io_ctx;
1898 		if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1899 			struct scsi_status_iu_header *siu;
1900 			u_int sense_size;
1901 			u_int sense_offset;
1902 
1903 			if (scb->flags & SCB_SENSE) {
1904 				sense_size = min(sizeof(struct scsi_sense_data)
1905 					       - ahd_get_sense_residual(scb),
1906 						 (u_long)SCSI_SENSE_BUFFERSIZE);
1907 				sense_offset = 0;
1908 			} else {
1909 				/*
1910 				 * Copy only the sense data into the provided
1911 				 * buffer.
1912 				 */
1913 				siu = (struct scsi_status_iu_header *)
1914 				    scb->sense_data;
1915 				sense_size = min_t(size_t,
1916 						scsi_4btoul(siu->sense_length),
1917 						SCSI_SENSE_BUFFERSIZE);
1918 				sense_offset = SIU_SENSE_OFFSET(siu);
1919 			}
1920 
1921 			memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1922 			memcpy(cmd->sense_buffer,
1923 			       ahd_get_sense_buf(ahd, scb)
1924 			       + sense_offset, sense_size);
1925 			set_status_byte(cmd, SAM_STAT_CHECK_CONDITION);
1926 
1927 #ifdef AHD_DEBUG
1928 			if (ahd_debug & AHD_SHOW_SENSE) {
1929 				int i;
1930 
1931 				printk("Copied %d bytes of sense data at %d:",
1932 				       sense_size, sense_offset);
1933 				for (i = 0; i < sense_size; i++) {
1934 					if ((i & 0xF) == 0)
1935 						printk("\n");
1936 					printk("0x%x ", cmd->sense_buffer[i]);
1937 				}
1938 				printk("\n");
1939 			}
1940 #endif
1941 		}
1942 		break;
1943 	}
1944 	case SAM_STAT_TASK_SET_FULL:
1945 		/*
1946 		 * By the time the core driver has returned this
1947 		 * command, all other commands that were queued
1948 		 * to us but not the device have been returned.
1949 		 * This ensures that dev->active is equal to
1950 		 * the number of commands actually queued to
1951 		 * the device.
1952 		 */
1953 		dev->tag_success_count = 0;
1954 		if (dev->active != 0) {
1955 			/*
1956 			 * Drop our opening count to the number
1957 			 * of commands currently outstanding.
1958 			 */
1959 			dev->openings = 0;
1960 #ifdef AHD_DEBUG
1961 			if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1962 				ahd_print_path(ahd, scb);
1963 				printk("Dropping tag count to %d\n",
1964 				       dev->active);
1965 			}
1966 #endif
1967 			if (dev->active == dev->tags_on_last_queuefull) {
1968 
1969 				dev->last_queuefull_same_count++;
1970 				/*
1971 				 * If we repeatedly see a queue full
1972 				 * at the same queue depth, this
1973 				 * device has a fixed number of tag
1974 				 * slots.  Lock in this tag depth
1975 				 * so we stop seeing queue fulls from
1976 				 * this device.
1977 				 */
1978 				if (dev->last_queuefull_same_count
1979 				 == AHD_LOCK_TAGS_COUNT) {
1980 					dev->maxtags = dev->active;
1981 					ahd_print_path(ahd, scb);
1982 					printk("Locking max tag count at %d\n",
1983 					       dev->active);
1984 				}
1985 			} else {
1986 				dev->tags_on_last_queuefull = dev->active;
1987 				dev->last_queuefull_same_count = 0;
1988 			}
1989 			ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
1990 			ahd_set_scsi_status(scb, SAM_STAT_GOOD);
1991 			ahd_platform_set_tags(ahd, sdev, &devinfo,
1992 				     (dev->flags & AHD_DEV_Q_BASIC)
1993 				   ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1994 			break;
1995 		}
1996 		/*
1997 		 * Drop down to a single opening, and treat this
1998 		 * as if the target returned BUSY SCSI status.
1999 		 */
2000 		dev->openings = 1;
2001 		ahd_platform_set_tags(ahd, sdev, &devinfo,
2002 			     (dev->flags & AHD_DEV_Q_BASIC)
2003 			   ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
2004 		ahd_set_scsi_status(scb, SAM_STAT_BUSY);
2005 	}
2006 }
2007 
2008 static void
2009 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
2010 {
2011 	int status;
2012 	int new_status = DID_OK;
2013 	int do_fallback = 0;
2014 	int scsi_status;
2015 	struct scsi_sense_data *sense;
2016 
2017 	/*
2018 	 * Map CAM error codes into Linux Error codes.  We
2019 	 * avoid the conversion so that the DV code has the
2020 	 * full error information available when making
2021 	 * state change decisions.
2022 	 */
2023 
2024 	status = ahd_cmd_get_transaction_status(cmd);
2025 	switch (status) {
2026 	case CAM_REQ_INPROG:
2027 	case CAM_REQ_CMP:
2028 		new_status = DID_OK;
2029 		break;
2030 	case CAM_AUTOSENSE_FAIL:
2031 		new_status = DID_ERROR;
2032 		fallthrough;
2033 	case CAM_SCSI_STATUS_ERROR:
2034 		scsi_status = ahd_cmd_get_scsi_status(cmd);
2035 
2036 		switch(scsi_status) {
2037 		case SAM_STAT_COMMAND_TERMINATED:
2038 		case SAM_STAT_CHECK_CONDITION:
2039 			sense = (struct scsi_sense_data *)
2040 				cmd->sense_buffer;
2041 			if (sense->extra_len >= 5 &&
2042 			    (sense->add_sense_code == 0x47
2043 			     || sense->add_sense_code == 0x48))
2044 				do_fallback = 1;
2045 			break;
2046 		default:
2047 			break;
2048 		}
2049 		break;
2050 	case CAM_REQ_ABORTED:
2051 		new_status = DID_ABORT;
2052 		break;
2053 	case CAM_BUSY:
2054 		new_status = DID_BUS_BUSY;
2055 		break;
2056 	case CAM_REQ_INVALID:
2057 	case CAM_PATH_INVALID:
2058 		new_status = DID_BAD_TARGET;
2059 		break;
2060 	case CAM_SEL_TIMEOUT:
2061 		new_status = DID_NO_CONNECT;
2062 		break;
2063 	case CAM_SCSI_BUS_RESET:
2064 	case CAM_BDR_SENT:
2065 		new_status = DID_RESET;
2066 		break;
2067 	case CAM_UNCOR_PARITY:
2068 		new_status = DID_PARITY;
2069 		do_fallback = 1;
2070 		break;
2071 	case CAM_CMD_TIMEOUT:
2072 		new_status = DID_TIME_OUT;
2073 		do_fallback = 1;
2074 		break;
2075 	case CAM_REQ_CMP_ERR:
2076 	case CAM_UNEXP_BUSFREE:
2077 	case CAM_DATA_RUN_ERR:
2078 		new_status = DID_ERROR;
2079 		do_fallback = 1;
2080 		break;
2081 	case CAM_UA_ABORT:
2082 	case CAM_NO_HBA:
2083 	case CAM_SEQUENCE_FAIL:
2084 	case CAM_CCB_LEN_ERR:
2085 	case CAM_PROVIDE_FAIL:
2086 	case CAM_REQ_TERMIO:
2087 	case CAM_UNREC_HBA_ERROR:
2088 	case CAM_REQ_TOO_BIG:
2089 		new_status = DID_ERROR;
2090 		break;
2091 	case CAM_REQUEUE_REQ:
2092 		new_status = DID_REQUEUE;
2093 		break;
2094 	default:
2095 		/* We should never get here */
2096 		new_status = DID_ERROR;
2097 		break;
2098 	}
2099 
2100 	if (do_fallback) {
2101 		printk("%s: device overrun (status %x) on %d:%d:%d\n",
2102 		       ahd_name(ahd), status, cmd->device->channel,
2103 		       cmd->device->id, (u8)cmd->device->lun);
2104 	}
2105 
2106 	ahd_cmd_set_transaction_status(cmd, new_status);
2107 
2108 	scsi_done(cmd);
2109 }
2110 
2111 static void
2112 ahd_freeze_simq(struct ahd_softc *ahd)
2113 {
2114 	scsi_block_requests(ahd->platform_data->host);
2115 }
2116 
2117 static void
2118 ahd_release_simq(struct ahd_softc *ahd)
2119 {
2120 	scsi_unblock_requests(ahd->platform_data->host);
2121 }
2122 
2123 static int
2124 ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd)
2125 {
2126 	struct ahd_softc *ahd;
2127 	struct ahd_linux_device *dev;
2128 	struct scb *pending_scb;
2129 	u_int  saved_scbptr;
2130 	u_int  active_scbptr;
2131 	u_int  last_phase;
2132 	u_int  cdb_byte;
2133 	int    retval = SUCCESS;
2134 	int    was_paused;
2135 	int    paused;
2136 	int    wait;
2137 	int    disconnected;
2138 	ahd_mode_state saved_modes;
2139 	unsigned long flags;
2140 
2141 	pending_scb = NULL;
2142 	paused = FALSE;
2143 	wait = FALSE;
2144 	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
2145 
2146 	scmd_printk(KERN_INFO, cmd,
2147 		    "Attempting to queue an ABORT message:");
2148 
2149 	printk("CDB:");
2150 	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2151 		printk(" 0x%x", cmd->cmnd[cdb_byte]);
2152 	printk("\n");
2153 
2154 	ahd_lock(ahd, &flags);
2155 
2156 	/*
2157 	 * First determine if we currently own this command.
2158 	 * Start by searching the device queue.  If not found
2159 	 * there, check the pending_scb list.  If not found
2160 	 * at all, and the system wanted us to just abort the
2161 	 * command, return success.
2162 	 */
2163 	dev = scsi_transport_device_data(cmd->device);
2164 
2165 	if (dev == NULL) {
2166 		/*
2167 		 * No target device for this command exists,
2168 		 * so we must not still own the command.
2169 		 */
2170 		scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
2171 		goto done;
2172 	}
2173 
2174 	/*
2175 	 * See if we can find a matching cmd in the pending list.
2176 	 */
2177 	LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2178 		if (pending_scb->io_ctx == cmd)
2179 			break;
2180 	}
2181 
2182 	if (pending_scb == NULL) {
2183 		scmd_printk(KERN_INFO, cmd, "Command not found\n");
2184 		goto done;
2185 	}
2186 
2187 	if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2188 		/*
2189 		 * We can't queue two recovery actions using the same SCB
2190 		 */
2191 		retval = FAILED;
2192 		goto done;
2193 	}
2194 
2195 	/*
2196 	 * Ensure that the card doesn't do anything
2197 	 * behind our back.  Also make sure that we
2198 	 * didn't "just" miss an interrupt that would
2199 	 * affect this cmd.
2200 	 */
2201 	was_paused = ahd_is_paused(ahd);
2202 	ahd_pause_and_flushwork(ahd);
2203 	paused = TRUE;
2204 
2205 	if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2206 		scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2207 		goto done;
2208 	}
2209 
2210 	printk("%s: At time of recovery, card was %spaused\n",
2211 	       ahd_name(ahd), was_paused ? "" : "not ");
2212 	ahd_dump_card_state(ahd);
2213 
2214 	disconnected = TRUE;
2215 	if (ahd_search_qinfifo(ahd, cmd->device->id,
2216 			       cmd->device->channel + 'A',
2217 			       cmd->device->lun,
2218 			       pending_scb->hscb->tag,
2219 			       ROLE_INITIATOR, CAM_REQ_ABORTED,
2220 			       SEARCH_COMPLETE) > 0) {
2221 		printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2222 		       ahd_name(ahd), cmd->device->channel,
2223 		       cmd->device->id, (u8)cmd->device->lun);
2224 		goto done;
2225 	}
2226 
2227 	saved_modes = ahd_save_modes(ahd);
2228 	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2229 	last_phase = ahd_inb(ahd, LASTPHASE);
2230 	saved_scbptr = ahd_get_scbptr(ahd);
2231 	active_scbptr = saved_scbptr;
2232 	if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2233 		struct scb *bus_scb;
2234 
2235 		bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2236 		if (bus_scb == pending_scb)
2237 			disconnected = FALSE;
2238 	}
2239 
2240 	/*
2241 	 * At this point, pending_scb is the scb associated with the
2242 	 * passed in command.  That command is currently active on the
2243 	 * bus or is in the disconnected state.
2244 	 */
2245 	ahd_inb(ahd, SAVED_SCSIID);
2246 	if (last_phase != P_BUSFREE
2247 	    && SCB_GET_TAG(pending_scb) == active_scbptr) {
2248 
2249 		/*
2250 		 * We're active on the bus, so assert ATN
2251 		 * and hope that the target responds.
2252 		 */
2253 		pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2254 		pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2255 		ahd_outb(ahd, MSG_OUT, HOST_MSG);
2256 		ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2257 		scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2258 		wait = TRUE;
2259 	} else if (disconnected) {
2260 
2261 		/*
2262 		 * Actually re-queue this SCB in an attempt
2263 		 * to select the device before it reconnects.
2264 		 */
2265 		pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2266 		ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2267 		pending_scb->hscb->cdb_len = 0;
2268 		pending_scb->hscb->task_attribute = 0;
2269 		pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2270 
2271 		if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2272 			/*
2273 			 * Mark the SCB has having an outstanding
2274 			 * task management function.  Should the command
2275 			 * complete normally before the task management
2276 			 * function can be sent, the host will be notified
2277 			 * to abort our requeued SCB.
2278 			 */
2279 			ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2280 				 pending_scb->hscb->task_management);
2281 		} else {
2282 			/*
2283 			 * If non-packetized, set the MK_MESSAGE control
2284 			 * bit indicating that we desire to send a message.
2285 			 * We also set the disconnected flag since there is
2286 			 * no guarantee that our SCB control byte matches
2287 			 * the version on the card.  We don't want the
2288 			 * sequencer to abort the command thinking an
2289 			 * unsolicited reselection occurred.
2290 			 */
2291 			pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2292 
2293 			/*
2294 			 * The sequencer will never re-reference the
2295 			 * in-core SCB.  To make sure we are notified
2296 			 * during reselection, set the MK_MESSAGE flag in
2297 			 * the card's copy of the SCB.
2298 			 */
2299 			ahd_outb(ahd, SCB_CONTROL,
2300 				 ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2301 		}
2302 
2303 		/*
2304 		 * Clear out any entries in the QINFIFO first
2305 		 * so we are the next SCB for this target
2306 		 * to run.
2307 		 */
2308 		ahd_search_qinfifo(ahd, cmd->device->id,
2309 				   cmd->device->channel + 'A', cmd->device->lun,
2310 				   SCB_LIST_NULL, ROLE_INITIATOR,
2311 				   CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2312 		ahd_qinfifo_requeue_tail(ahd, pending_scb);
2313 		ahd_set_scbptr(ahd, saved_scbptr);
2314 		ahd_print_path(ahd, pending_scb);
2315 		printk("Device is disconnected, re-queuing SCB\n");
2316 		wait = TRUE;
2317 	} else {
2318 		scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2319 		retval = FAILED;
2320 	}
2321 
2322 
2323 	ahd_restore_modes(ahd, saved_modes);
2324 done:
2325 	if (paused)
2326 		ahd_unpause(ahd);
2327 	if (wait) {
2328 		DECLARE_COMPLETION_ONSTACK(done);
2329 
2330 		ahd->platform_data->eh_done = &done;
2331 		ahd_unlock(ahd, &flags);
2332 
2333 		printk("%s: Recovery code sleeping\n", ahd_name(ahd));
2334 		if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2335 			ahd_lock(ahd, &flags);
2336 			ahd->platform_data->eh_done = NULL;
2337 			ahd_unlock(ahd, &flags);
2338 			printk("%s: Timer Expired (active %d)\n",
2339 			       ahd_name(ahd), dev->active);
2340 			retval = FAILED;
2341 		}
2342 		printk("Recovery code awake\n");
2343 	} else
2344 		ahd_unlock(ahd, &flags);
2345 
2346 	if (retval != SUCCESS)
2347 		printk("%s: Command abort returning 0x%x\n",
2348 		       ahd_name(ahd), retval);
2349 
2350 	return retval;
2351 }
2352 
2353 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2354 {
2355 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2356 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2357 	struct ahd_devinfo devinfo;
2358 	unsigned long flags;
2359 
2360 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2361 			    starget->channel + 'A', ROLE_INITIATOR);
2362 	ahd_lock(ahd, &flags);
2363 	ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2364 	ahd_unlock(ahd, &flags);
2365 }
2366 
2367 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2368 {
2369 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2370 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2371 	struct ahd_tmode_tstate *tstate;
2372 	struct ahd_initiator_tinfo *tinfo
2373 		= ahd_fetch_transinfo(ahd,
2374 				      starget->channel + 'A',
2375 				      shost->this_id, starget->id, &tstate);
2376 	struct ahd_devinfo devinfo;
2377 	unsigned int ppr_options = tinfo->goal.ppr_options;
2378 	unsigned int dt;
2379 	unsigned long flags;
2380 	unsigned long offset = tinfo->goal.offset;
2381 
2382 #ifdef AHD_DEBUG
2383 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2384 		printk("%s: set period to %d\n", ahd_name(ahd), period);
2385 #endif
2386 	if (offset == 0)
2387 		offset = MAX_OFFSET;
2388 
2389 	if (period < 8)
2390 		period = 8;
2391 	if (period < 10) {
2392 		if (spi_max_width(starget)) {
2393 			ppr_options |= MSG_EXT_PPR_DT_REQ;
2394 			if (period == 8)
2395 				ppr_options |= MSG_EXT_PPR_IU_REQ;
2396 		} else
2397 			period = 10;
2398 	}
2399 
2400 	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2401 
2402 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2403 			    starget->channel + 'A', ROLE_INITIATOR);
2404 
2405 	/* all PPR requests apart from QAS require wide transfers */
2406 	if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2407 		if (spi_width(starget) == 0)
2408 			ppr_options &= MSG_EXT_PPR_QAS_REQ;
2409 	}
2410 
2411 	ahd_find_syncrate(ahd, &period, &ppr_options,
2412 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2413 
2414 	ahd_lock(ahd, &flags);
2415 	ahd_set_syncrate(ahd, &devinfo, period, offset,
2416 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2417 	ahd_unlock(ahd, &flags);
2418 }
2419 
2420 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2421 {
2422 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2423 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2424 	struct ahd_tmode_tstate *tstate;
2425 	struct ahd_initiator_tinfo *tinfo
2426 		= ahd_fetch_transinfo(ahd,
2427 				      starget->channel + 'A',
2428 				      shost->this_id, starget->id, &tstate);
2429 	struct ahd_devinfo devinfo;
2430 	unsigned int ppr_options = 0;
2431 	unsigned int period = 0;
2432 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2433 	unsigned long flags;
2434 
2435 #ifdef AHD_DEBUG
2436 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2437 		printk("%s: set offset to %d\n", ahd_name(ahd), offset);
2438 #endif
2439 
2440 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2441 			    starget->channel + 'A', ROLE_INITIATOR);
2442 	if (offset != 0) {
2443 		period = tinfo->goal.period;
2444 		ppr_options = tinfo->goal.ppr_options;
2445 		ahd_find_syncrate(ahd, &period, &ppr_options,
2446 				  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2447 	}
2448 
2449 	ahd_lock(ahd, &flags);
2450 	ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2451 			 AHD_TRANS_GOAL, FALSE);
2452 	ahd_unlock(ahd, &flags);
2453 }
2454 
2455 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
2456 {
2457 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2458 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2459 	struct ahd_tmode_tstate *tstate;
2460 	struct ahd_initiator_tinfo *tinfo
2461 		= ahd_fetch_transinfo(ahd,
2462 				      starget->channel + 'A',
2463 				      shost->this_id, starget->id, &tstate);
2464 	struct ahd_devinfo devinfo;
2465 	unsigned int ppr_options = tinfo->goal.ppr_options
2466 		& ~MSG_EXT_PPR_DT_REQ;
2467 	unsigned int period = tinfo->goal.period;
2468 	unsigned int width = tinfo->goal.width;
2469 	unsigned long flags;
2470 
2471 #ifdef AHD_DEBUG
2472 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2473 		printk("%s: %s DT\n", ahd_name(ahd),
2474 		       dt ? "enabling" : "disabling");
2475 #endif
2476 	if (dt && spi_max_width(starget)) {
2477 		ppr_options |= MSG_EXT_PPR_DT_REQ;
2478 		if (!width)
2479 			ahd_linux_set_width(starget, 1);
2480 	} else {
2481 		if (period <= 9)
2482 			period = 10; /* If resetting DT, period must be >= 25ns */
2483 		/* IU is invalid without DT set */
2484 		ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2485 	}
2486 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2487 			    starget->channel + 'A', ROLE_INITIATOR);
2488 	ahd_find_syncrate(ahd, &period, &ppr_options,
2489 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2490 
2491 	ahd_lock(ahd, &flags);
2492 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2493 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2494 	ahd_unlock(ahd, &flags);
2495 }
2496 
2497 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2498 {
2499 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2500 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2501 	struct ahd_tmode_tstate *tstate;
2502 	struct ahd_initiator_tinfo *tinfo
2503 		= ahd_fetch_transinfo(ahd,
2504 				      starget->channel + 'A',
2505 				      shost->this_id, starget->id, &tstate);
2506 	struct ahd_devinfo devinfo;
2507 	unsigned int ppr_options = tinfo->goal.ppr_options
2508 		& ~MSG_EXT_PPR_QAS_REQ;
2509 	unsigned int period = tinfo->goal.period;
2510 	unsigned int dt;
2511 	unsigned long flags;
2512 
2513 #ifdef AHD_DEBUG
2514 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2515 		printk("%s: %s QAS\n", ahd_name(ahd),
2516 		       qas ? "enabling" : "disabling");
2517 #endif
2518 
2519 	if (qas) {
2520 		ppr_options |= MSG_EXT_PPR_QAS_REQ;
2521 	}
2522 
2523 	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2524 
2525 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2526 			    starget->channel + 'A', ROLE_INITIATOR);
2527 	ahd_find_syncrate(ahd, &period, &ppr_options,
2528 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2529 
2530 	ahd_lock(ahd, &flags);
2531 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2532 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2533 	ahd_unlock(ahd, &flags);
2534 }
2535 
2536 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2537 {
2538 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2539 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2540 	struct ahd_tmode_tstate *tstate;
2541 	struct ahd_initiator_tinfo *tinfo
2542 		= ahd_fetch_transinfo(ahd,
2543 				      starget->channel + 'A',
2544 				      shost->this_id, starget->id, &tstate);
2545 	struct ahd_devinfo devinfo;
2546 	unsigned int ppr_options = tinfo->goal.ppr_options
2547 		& ~MSG_EXT_PPR_IU_REQ;
2548 	unsigned int period = tinfo->goal.period;
2549 	unsigned int dt;
2550 	unsigned long flags;
2551 
2552 #ifdef AHD_DEBUG
2553 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2554 		printk("%s: %s IU\n", ahd_name(ahd),
2555 		       iu ? "enabling" : "disabling");
2556 #endif
2557 
2558 	if (iu && spi_max_width(starget)) {
2559 		ppr_options |= MSG_EXT_PPR_IU_REQ;
2560 		ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2561 	}
2562 
2563 	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2564 
2565 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2566 			    starget->channel + 'A', ROLE_INITIATOR);
2567 	ahd_find_syncrate(ahd, &period, &ppr_options,
2568 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2569 
2570 	ahd_lock(ahd, &flags);
2571 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2572 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2573 	ahd_unlock(ahd, &flags);
2574 }
2575 
2576 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2577 {
2578 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2579 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2580 	struct ahd_tmode_tstate *tstate;
2581 	struct ahd_initiator_tinfo *tinfo
2582 		= ahd_fetch_transinfo(ahd,
2583 				      starget->channel + 'A',
2584 				      shost->this_id, starget->id, &tstate);
2585 	struct ahd_devinfo devinfo;
2586 	unsigned int ppr_options = tinfo->goal.ppr_options
2587 		& ~MSG_EXT_PPR_RD_STRM;
2588 	unsigned int period = tinfo->goal.period;
2589 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2590 	unsigned long flags;
2591 
2592 #ifdef AHD_DEBUG
2593 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2594 		printk("%s: %s Read Streaming\n", ahd_name(ahd),
2595 		       rdstrm  ? "enabling" : "disabling");
2596 #endif
2597 
2598 	if (rdstrm && spi_max_width(starget))
2599 		ppr_options |= MSG_EXT_PPR_RD_STRM;
2600 
2601 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2602 			    starget->channel + 'A', ROLE_INITIATOR);
2603 	ahd_find_syncrate(ahd, &period, &ppr_options,
2604 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2605 
2606 	ahd_lock(ahd, &flags);
2607 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2608 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2609 	ahd_unlock(ahd, &flags);
2610 }
2611 
2612 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2613 {
2614 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2615 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2616 	struct ahd_tmode_tstate *tstate;
2617 	struct ahd_initiator_tinfo *tinfo
2618 		= ahd_fetch_transinfo(ahd,
2619 				      starget->channel + 'A',
2620 				      shost->this_id, starget->id, &tstate);
2621 	struct ahd_devinfo devinfo;
2622 	unsigned int ppr_options = tinfo->goal.ppr_options
2623 		& ~MSG_EXT_PPR_WR_FLOW;
2624 	unsigned int period = tinfo->goal.period;
2625 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2626 	unsigned long flags;
2627 
2628 #ifdef AHD_DEBUG
2629 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2630 		printk("%s: %s Write Flow Control\n", ahd_name(ahd),
2631 		       wrflow ? "enabling" : "disabling");
2632 #endif
2633 
2634 	if (wrflow && spi_max_width(starget))
2635 		ppr_options |= MSG_EXT_PPR_WR_FLOW;
2636 
2637 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2638 			    starget->channel + 'A', ROLE_INITIATOR);
2639 	ahd_find_syncrate(ahd, &period, &ppr_options,
2640 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2641 
2642 	ahd_lock(ahd, &flags);
2643 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2644 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2645 	ahd_unlock(ahd, &flags);
2646 }
2647 
2648 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2649 {
2650 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2651 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2652 	struct ahd_tmode_tstate *tstate;
2653 	struct ahd_initiator_tinfo *tinfo
2654 		= ahd_fetch_transinfo(ahd,
2655 				      starget->channel + 'A',
2656 				      shost->this_id, starget->id, &tstate);
2657 	struct ahd_devinfo devinfo;
2658 	unsigned int ppr_options = tinfo->goal.ppr_options
2659 		& ~MSG_EXT_PPR_RTI;
2660 	unsigned int period = tinfo->goal.period;
2661 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2662 	unsigned long flags;
2663 
2664 	if ((ahd->features & AHD_RTI) == 0) {
2665 #ifdef AHD_DEBUG
2666 		if ((ahd_debug & AHD_SHOW_DV) != 0)
2667 			printk("%s: RTI not available\n", ahd_name(ahd));
2668 #endif
2669 		return;
2670 	}
2671 
2672 #ifdef AHD_DEBUG
2673 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2674 		printk("%s: %s RTI\n", ahd_name(ahd),
2675 		       rti ? "enabling" : "disabling");
2676 #endif
2677 
2678 	if (rti && spi_max_width(starget))
2679 		ppr_options |= MSG_EXT_PPR_RTI;
2680 
2681 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2682 			    starget->channel + 'A', ROLE_INITIATOR);
2683 	ahd_find_syncrate(ahd, &period, &ppr_options,
2684 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2685 
2686 	ahd_lock(ahd, &flags);
2687 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2688 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2689 	ahd_unlock(ahd, &flags);
2690 }
2691 
2692 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2693 {
2694 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2695 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2696 	struct ahd_tmode_tstate *tstate;
2697 	struct ahd_initiator_tinfo *tinfo
2698 		= ahd_fetch_transinfo(ahd,
2699 				      starget->channel + 'A',
2700 				      shost->this_id, starget->id, &tstate);
2701 	struct ahd_devinfo devinfo;
2702 	unsigned int ppr_options = tinfo->goal.ppr_options
2703 		& ~MSG_EXT_PPR_PCOMP_EN;
2704 	unsigned int period = tinfo->goal.period;
2705 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2706 	unsigned long flags;
2707 
2708 #ifdef AHD_DEBUG
2709 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2710 		printk("%s: %s Precompensation\n", ahd_name(ahd),
2711 		       pcomp ? "Enable" : "Disable");
2712 #endif
2713 
2714 	if (pcomp && spi_max_width(starget)) {
2715 		uint8_t precomp;
2716 
2717 		if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
2718 			const struct ahd_linux_iocell_opts *iocell_opts;
2719 
2720 			iocell_opts = &aic79xx_iocell_info[ahd->unit];
2721 			precomp = iocell_opts->precomp;
2722 		} else {
2723 			precomp = AIC79XX_DEFAULT_PRECOMP;
2724 		}
2725 		ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2726 		AHD_SET_PRECOMP(ahd, precomp);
2727 	} else {
2728 		AHD_SET_PRECOMP(ahd, 0);
2729 	}
2730 
2731 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2732 			    starget->channel + 'A', ROLE_INITIATOR);
2733 	ahd_find_syncrate(ahd, &period, &ppr_options,
2734 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2735 
2736 	ahd_lock(ahd, &flags);
2737 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2738 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2739 	ahd_unlock(ahd, &flags);
2740 }
2741 
2742 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2743 {
2744 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2745 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2746 	struct ahd_tmode_tstate *tstate;
2747 	struct ahd_initiator_tinfo *tinfo
2748 		= ahd_fetch_transinfo(ahd,
2749 				      starget->channel + 'A',
2750 				      shost->this_id, starget->id, &tstate);
2751 	struct ahd_devinfo devinfo;
2752 	unsigned int ppr_options = tinfo->goal.ppr_options
2753 		& ~MSG_EXT_PPR_HOLD_MCS;
2754 	unsigned int period = tinfo->goal.period;
2755 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2756 	unsigned long flags;
2757 
2758 	if (hold && spi_max_width(starget))
2759 		ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2760 
2761 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2762 			    starget->channel + 'A', ROLE_INITIATOR);
2763 	ahd_find_syncrate(ahd, &period, &ppr_options,
2764 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2765 
2766 	ahd_lock(ahd, &flags);
2767 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2768 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2769 	ahd_unlock(ahd, &flags);
2770 }
2771 
2772 static void ahd_linux_get_signalling(struct Scsi_Host *shost)
2773 {
2774 	struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
2775 	unsigned long flags;
2776 	u8 mode;
2777 
2778 	ahd_lock(ahd, &flags);
2779 	ahd_pause(ahd);
2780 	mode = ahd_inb(ahd, SBLKCTL);
2781 	ahd_unpause(ahd);
2782 	ahd_unlock(ahd, &flags);
2783 
2784 	if (mode & ENAB40)
2785 		spi_signalling(shost) = SPI_SIGNAL_LVD;
2786 	else if (mode & ENAB20)
2787 		spi_signalling(shost) = SPI_SIGNAL_SE;
2788 	else
2789 		spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2790 }
2791 
2792 static struct spi_function_template ahd_linux_transport_functions = {
2793 	.set_offset	= ahd_linux_set_offset,
2794 	.show_offset	= 1,
2795 	.set_period	= ahd_linux_set_period,
2796 	.show_period	= 1,
2797 	.set_width	= ahd_linux_set_width,
2798 	.show_width	= 1,
2799 	.set_dt		= ahd_linux_set_dt,
2800 	.show_dt	= 1,
2801 	.set_iu		= ahd_linux_set_iu,
2802 	.show_iu	= 1,
2803 	.set_qas	= ahd_linux_set_qas,
2804 	.show_qas	= 1,
2805 	.set_rd_strm	= ahd_linux_set_rd_strm,
2806 	.show_rd_strm	= 1,
2807 	.set_wr_flow	= ahd_linux_set_wr_flow,
2808 	.show_wr_flow	= 1,
2809 	.set_rti	= ahd_linux_set_rti,
2810 	.show_rti	= 1,
2811 	.set_pcomp_en	= ahd_linux_set_pcomp_en,
2812 	.show_pcomp_en	= 1,
2813 	.set_hold_mcs	= ahd_linux_set_hold_mcs,
2814 	.show_hold_mcs	= 1,
2815 	.get_signalling = ahd_linux_get_signalling,
2816 };
2817 
2818 static int __init
2819 ahd_linux_init(void)
2820 {
2821 	int	error = 0;
2822 
2823 	/*
2824 	 * If we've been passed any parameters, process them now.
2825 	 */
2826 	if (aic79xx)
2827 		aic79xx_setup(aic79xx);
2828 
2829 	ahd_linux_transport_template =
2830 		spi_attach_transport(&ahd_linux_transport_functions);
2831 	if (!ahd_linux_transport_template)
2832 		return -ENODEV;
2833 
2834 	scsi_transport_reserve_device(ahd_linux_transport_template,
2835 				      sizeof(struct ahd_linux_device));
2836 
2837 	error = ahd_linux_pci_init();
2838 	if (error)
2839 		spi_release_transport(ahd_linux_transport_template);
2840 	return error;
2841 }
2842 
2843 static void __exit
2844 ahd_linux_exit(void)
2845 {
2846 	ahd_linux_pci_exit();
2847 	spi_release_transport(ahd_linux_transport_template);
2848 }
2849 
2850 module_init(ahd_linux_init);
2851 module_exit(ahd_linux_exit);
2852