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
576 ahd_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
577 {
578 	struct	 ahd_softc *ahd;
579 	struct	 ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
580 	int rtn = SCSI_MLQUEUE_HOST_BUSY;
581 
582 	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
583 
584 	cmd->scsi_done = scsi_done;
585 	cmd->result = CAM_REQ_INPROG << 16;
586 	rtn = ahd_linux_run_command(ahd, dev, cmd);
587 
588 	return rtn;
589 }
590 
591 static DEF_SCSI_QCMD(ahd_linux_queue)
592 
593 static struct scsi_target **
594 ahd_linux_target_in_softc(struct scsi_target *starget)
595 {
596 	struct	ahd_softc *ahd =
597 		*((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
598 	unsigned int target_offset;
599 
600 	target_offset = starget->id;
601 	if (starget->channel != 0)
602 		target_offset += 8;
603 
604 	return &ahd->platform_data->starget[target_offset];
605 }
606 
607 static int
608 ahd_linux_target_alloc(struct scsi_target *starget)
609 {
610 	struct	ahd_softc *ahd =
611 		*((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
612 	struct seeprom_config *sc = ahd->seep_config;
613 	unsigned long flags;
614 	struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
615 	struct ahd_devinfo devinfo;
616 	struct ahd_initiator_tinfo *tinfo;
617 	struct ahd_tmode_tstate *tstate;
618 	char channel = starget->channel + 'A';
619 
620 	ahd_lock(ahd, &flags);
621 
622 	BUG_ON(*ahd_targp != NULL);
623 
624 	*ahd_targp = starget;
625 
626 	if (sc) {
627 		int flags = sc->device_flags[starget->id];
628 
629 		tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
630 					    starget->id, &tstate);
631 
632 		if ((flags  & CFPACKETIZED) == 0) {
633 			/* don't negotiate packetized (IU) transfers */
634 			spi_max_iu(starget) = 0;
635 		} else {
636 			if ((ahd->features & AHD_RTI) == 0)
637 				spi_rti(starget) = 0;
638 		}
639 
640 		if ((flags & CFQAS) == 0)
641 			spi_max_qas(starget) = 0;
642 
643 		/* Transinfo values have been set to BIOS settings */
644 		spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
645 		spi_min_period(starget) = tinfo->user.period;
646 		spi_max_offset(starget) = tinfo->user.offset;
647 	}
648 
649 	tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
650 				    starget->id, &tstate);
651 	ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
652 			    CAM_LUN_WILDCARD, channel,
653 			    ROLE_INITIATOR);
654 	ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
655 			 AHD_TRANS_GOAL, /*paused*/FALSE);
656 	ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
657 		      AHD_TRANS_GOAL, /*paused*/FALSE);
658 	ahd_unlock(ahd, &flags);
659 
660 	return 0;
661 }
662 
663 static void
664 ahd_linux_target_destroy(struct scsi_target *starget)
665 {
666 	struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
667 
668 	*ahd_targp = NULL;
669 }
670 
671 static int
672 ahd_linux_slave_alloc(struct scsi_device *sdev)
673 {
674 	struct	ahd_softc *ahd =
675 		*((struct ahd_softc **)sdev->host->hostdata);
676 	struct ahd_linux_device *dev;
677 
678 	if (bootverbose)
679 		printk("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
680 
681 	dev = scsi_transport_device_data(sdev);
682 	memset(dev, 0, sizeof(*dev));
683 
684 	/*
685 	 * We start out life using untagged
686 	 * transactions of which we allow one.
687 	 */
688 	dev->openings = 1;
689 
690 	/*
691 	 * Set maxtags to 0.  This will be changed if we
692 	 * later determine that we are dealing with
693 	 * a tagged queuing capable device.
694 	 */
695 	dev->maxtags = 0;
696 
697 	return (0);
698 }
699 
700 static int
701 ahd_linux_slave_configure(struct scsi_device *sdev)
702 {
703 	struct	ahd_softc *ahd;
704 
705 	ahd = *((struct ahd_softc **)sdev->host->hostdata);
706 	if (bootverbose)
707 		sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
708 
709 	ahd_linux_device_queue_depth(sdev);
710 
711 	/* Initial Domain Validation */
712 	if (!spi_initial_dv(sdev->sdev_target))
713 		spi_dv_device(sdev);
714 
715 	return 0;
716 }
717 
718 #if defined(__i386__)
719 /*
720  * Return the disk geometry for the given SCSI device.
721  */
722 static int
723 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
724 		    sector_t capacity, int geom[])
725 {
726 	uint8_t *bh;
727 	int	 heads;
728 	int	 sectors;
729 	int	 cylinders;
730 	int	 ret;
731 	int	 extended;
732 	struct	 ahd_softc *ahd;
733 
734 	ahd = *((struct ahd_softc **)sdev->host->hostdata);
735 
736 	bh = scsi_bios_ptable(bdev);
737 	if (bh) {
738 		ret = scsi_partsize(bh, capacity,
739 				    &geom[2], &geom[0], &geom[1]);
740 		kfree(bh);
741 		if (ret != -1)
742 			return (ret);
743 	}
744 	heads = 64;
745 	sectors = 32;
746 	cylinders = aic_sector_div(capacity, heads, sectors);
747 
748 	if (aic79xx_extended != 0)
749 		extended = 1;
750 	else
751 		extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
752 	if (extended && cylinders >= 1024) {
753 		heads = 255;
754 		sectors = 63;
755 		cylinders = aic_sector_div(capacity, heads, sectors);
756 	}
757 	geom[0] = heads;
758 	geom[1] = sectors;
759 	geom[2] = cylinders;
760 	return (0);
761 }
762 #endif
763 
764 /*
765  * Abort the current SCSI command(s).
766  */
767 static int
768 ahd_linux_abort(struct scsi_cmnd *cmd)
769 {
770 	int error;
771 
772 	error = ahd_linux_queue_abort_cmd(cmd);
773 
774 	return error;
775 }
776 
777 /*
778  * Attempt to send a target reset message to the device that timed out.
779  */
780 static int
781 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
782 {
783 	struct ahd_softc *ahd;
784 	struct ahd_linux_device *dev;
785 	struct scb *reset_scb;
786 	u_int  cdb_byte;
787 	int    retval = SUCCESS;
788 	int    paused;
789 	int    wait;
790 	struct	ahd_initiator_tinfo *tinfo;
791 	struct	ahd_tmode_tstate *tstate;
792 	unsigned long flags;
793 	DECLARE_COMPLETION_ONSTACK(done);
794 
795 	reset_scb = NULL;
796 	paused = FALSE;
797 	wait = FALSE;
798 	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
799 
800 	scmd_printk(KERN_INFO, cmd,
801 		    "Attempting to queue a TARGET RESET message:");
802 
803 	printk("CDB:");
804 	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
805 		printk(" 0x%x", cmd->cmnd[cdb_byte]);
806 	printk("\n");
807 
808 	/*
809 	 * Determine if we currently own this command.
810 	 */
811 	dev = scsi_transport_device_data(cmd->device);
812 
813 	if (dev == NULL) {
814 		/*
815 		 * No target device for this command exists,
816 		 * so we must not still own the command.
817 		 */
818 		scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
819 		return SUCCESS;
820 	}
821 
822 	/*
823 	 * Generate us a new SCB
824 	 */
825 	reset_scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX);
826 	if (!reset_scb) {
827 		scmd_printk(KERN_INFO, cmd, "No SCB available\n");
828 		return FAILED;
829 	}
830 
831 	tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
832 				    cmd->device->id, &tstate);
833 	reset_scb->io_ctx = cmd;
834 	reset_scb->platform_data->dev = dev;
835 	reset_scb->sg_count = 0;
836 	ahd_set_residual(reset_scb, 0);
837 	ahd_set_sense_residual(reset_scb, 0);
838 	reset_scb->platform_data->xfer_len = 0;
839 	reset_scb->hscb->control = 0;
840 	reset_scb->hscb->scsiid = BUILD_SCSIID(ahd,cmd);
841 	reset_scb->hscb->lun = cmd->device->lun;
842 	reset_scb->hscb->cdb_len = 0;
843 	reset_scb->hscb->task_management = SIU_TASKMGMT_LUN_RESET;
844 	reset_scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
845 	if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
846 		reset_scb->flags |= SCB_PACKETIZED;
847 	} else {
848 		reset_scb->hscb->control |= MK_MESSAGE;
849 	}
850 	dev->openings--;
851 	dev->active++;
852 	dev->commands_issued++;
853 
854 	ahd_lock(ahd, &flags);
855 
856 	LIST_INSERT_HEAD(&ahd->pending_scbs, reset_scb, pending_links);
857 	ahd_queue_scb(ahd, reset_scb);
858 
859 	ahd->platform_data->eh_done = &done;
860 	ahd_unlock(ahd, &flags);
861 
862 	printk("%s: Device reset code sleeping\n", ahd_name(ahd));
863 	if (!wait_for_completion_timeout(&done, 5 * HZ)) {
864 		ahd_lock(ahd, &flags);
865 		ahd->platform_data->eh_done = NULL;
866 		ahd_unlock(ahd, &flags);
867 		printk("%s: Device reset timer expired (active %d)\n",
868 		       ahd_name(ahd), dev->active);
869 		retval = FAILED;
870 	}
871 	printk("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
872 
873 	return (retval);
874 }
875 
876 /*
877  * Reset the SCSI bus.
878  */
879 static int
880 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
881 {
882 	struct ahd_softc *ahd;
883 	int    found;
884 	unsigned long flags;
885 
886 	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
887 #ifdef AHD_DEBUG
888 	if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
889 		printk("%s: Bus reset called for cmd %p\n",
890 		       ahd_name(ahd), cmd);
891 #endif
892 	ahd_lock(ahd, &flags);
893 
894 	found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
895 				  /*initiate reset*/TRUE);
896 	ahd_unlock(ahd, &flags);
897 
898 	if (bootverbose)
899 		printk("%s: SCSI bus reset delivered. "
900 		       "%d SCBs aborted.\n", ahd_name(ahd), found);
901 
902 	return (SUCCESS);
903 }
904 
905 struct scsi_host_template aic79xx_driver_template = {
906 	.module			= THIS_MODULE,
907 	.name			= "aic79xx",
908 	.proc_name		= "aic79xx",
909 	.proc_info		= ahd_linux_proc_info,
910 	.info			= ahd_linux_info,
911 	.queuecommand		= ahd_linux_queue,
912 	.eh_abort_handler	= ahd_linux_abort,
913 	.eh_device_reset_handler = ahd_linux_dev_reset,
914 	.eh_bus_reset_handler	= ahd_linux_bus_reset,
915 #if defined(__i386__)
916 	.bios_param		= ahd_linux_biosparam,
917 #endif
918 	.can_queue		= AHD_MAX_QUEUE,
919 	.this_id		= -1,
920 	.max_sectors		= 8192,
921 	.cmd_per_lun		= 2,
922 	.use_clustering		= ENABLE_CLUSTERING,
923 	.slave_alloc		= ahd_linux_slave_alloc,
924 	.slave_configure	= ahd_linux_slave_configure,
925 	.target_alloc		= ahd_linux_target_alloc,
926 	.target_destroy		= ahd_linux_target_destroy,
927 };
928 
929 /******************************** Bus DMA *************************************/
930 int
931 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
932 		   bus_size_t alignment, bus_size_t boundary,
933 		   dma_addr_t lowaddr, dma_addr_t highaddr,
934 		   bus_dma_filter_t *filter, void *filterarg,
935 		   bus_size_t maxsize, int nsegments,
936 		   bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
937 {
938 	bus_dma_tag_t dmat;
939 
940 	dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
941 	if (dmat == NULL)
942 		return (ENOMEM);
943 
944 	/*
945 	 * Linux is very simplistic about DMA memory.  For now don't
946 	 * maintain all specification information.  Once Linux supplies
947 	 * better facilities for doing these operations, or the
948 	 * needs of this particular driver change, we might need to do
949 	 * more here.
950 	 */
951 	dmat->alignment = alignment;
952 	dmat->boundary = boundary;
953 	dmat->maxsize = maxsize;
954 	*ret_tag = dmat;
955 	return (0);
956 }
957 
958 void
959 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
960 {
961 	kfree(dmat);
962 }
963 
964 int
965 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
966 		 int flags, bus_dmamap_t *mapp)
967 {
968 	*vaddr = pci_alloc_consistent(ahd->dev_softc,
969 				      dmat->maxsize, mapp);
970 	if (*vaddr == NULL)
971 		return (ENOMEM);
972 	return(0);
973 }
974 
975 void
976 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
977 		void* vaddr, bus_dmamap_t map)
978 {
979 	pci_free_consistent(ahd->dev_softc, dmat->maxsize,
980 			    vaddr, map);
981 }
982 
983 int
984 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
985 		void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
986 		void *cb_arg, int flags)
987 {
988 	/*
989 	 * Assume for now that this will only be used during
990 	 * initialization and not for per-transaction buffer mapping.
991 	 */
992 	bus_dma_segment_t stack_sg;
993 
994 	stack_sg.ds_addr = map;
995 	stack_sg.ds_len = dmat->maxsize;
996 	cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
997 	return (0);
998 }
999 
1000 void
1001 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
1002 {
1003 }
1004 
1005 int
1006 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
1007 {
1008 	/* Nothing to do */
1009 	return (0);
1010 }
1011 
1012 /********************* Platform Dependent Functions ***************************/
1013 static void
1014 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
1015 {
1016 
1017 	if ((instance >= 0)
1018 	 && (instance < ARRAY_SIZE(aic79xx_iocell_info))) {
1019 		uint8_t *iocell_info;
1020 
1021 		iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
1022 		iocell_info[index] = value & 0xFFFF;
1023 		if (bootverbose)
1024 			printk("iocell[%d:%ld] = %d\n", instance, index, value);
1025 	}
1026 }
1027 
1028 static void
1029 ahd_linux_setup_tag_info_global(char *p)
1030 {
1031 	int tags, i, j;
1032 
1033 	tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1034 	printk("Setting Global Tags= %d\n", tags);
1035 
1036 	for (i = 0; i < ARRAY_SIZE(aic79xx_tag_info); i++) {
1037 		for (j = 0; j < AHD_NUM_TARGETS; j++) {
1038 			aic79xx_tag_info[i].tag_commands[j] = tags;
1039 		}
1040 	}
1041 }
1042 
1043 static void
1044 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1045 {
1046 
1047 	if ((instance >= 0) && (targ >= 0)
1048 	 && (instance < ARRAY_SIZE(aic79xx_tag_info))
1049 	 && (targ < AHD_NUM_TARGETS)) {
1050 		aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
1051 		if (bootverbose)
1052 			printk("tag_info[%d:%d] = %d\n", instance, targ, value);
1053 	}
1054 }
1055 
1056 static char *
1057 ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
1058 		       void (*callback)(u_long, int, int, int32_t),
1059 		       u_long callback_arg)
1060 {
1061 	char	*tok_end;
1062 	char	*tok_end2;
1063 	int      i;
1064 	int      instance;
1065 	int	 targ;
1066 	int	 done;
1067 	char	 tok_list[] = {'.', ',', '{', '}', '\0'};
1068 
1069 	/* All options use a ':' name/arg separator */
1070 	if (*opt_arg != ':')
1071 		return (opt_arg);
1072 	opt_arg++;
1073 	instance = -1;
1074 	targ = -1;
1075 	done = FALSE;
1076 	/*
1077 	 * Restore separator that may be in
1078 	 * the middle of our option argument.
1079 	 */
1080 	tok_end = strchr(opt_arg, '\0');
1081 	if (tok_end < end)
1082 		*tok_end = ',';
1083 	while (!done) {
1084 		switch (*opt_arg) {
1085 		case '{':
1086 			if (instance == -1) {
1087 				instance = 0;
1088 			} else {
1089 				if (depth > 1) {
1090 					if (targ == -1)
1091 						targ = 0;
1092 				} else {
1093 					printk("Malformed Option %s\n",
1094 					       opt_name);
1095 					done = TRUE;
1096 				}
1097 			}
1098 			opt_arg++;
1099 			break;
1100 		case '}':
1101 			if (targ != -1)
1102 				targ = -1;
1103 			else if (instance != -1)
1104 				instance = -1;
1105 			opt_arg++;
1106 			break;
1107 		case ',':
1108 		case '.':
1109 			if (instance == -1)
1110 				done = TRUE;
1111 			else if (targ >= 0)
1112 				targ++;
1113 			else if (instance >= 0)
1114 				instance++;
1115 			opt_arg++;
1116 			break;
1117 		case '\0':
1118 			done = TRUE;
1119 			break;
1120 		default:
1121 			tok_end = end;
1122 			for (i = 0; tok_list[i]; i++) {
1123 				tok_end2 = strchr(opt_arg, tok_list[i]);
1124 				if ((tok_end2) && (tok_end2 < tok_end))
1125 					tok_end = tok_end2;
1126 			}
1127 			callback(callback_arg, instance, targ,
1128 				 simple_strtol(opt_arg, NULL, 0));
1129 			opt_arg = tok_end;
1130 			break;
1131 		}
1132 	}
1133 	return (opt_arg);
1134 }
1135 
1136 /*
1137  * Handle Linux boot parameters. This routine allows for assigning a value
1138  * to a parameter with a ':' between the parameter and the value.
1139  * ie. aic79xx=stpwlev:1,extended
1140  */
1141 static int
1142 aic79xx_setup(char *s)
1143 {
1144 	int	i, n;
1145 	char   *p;
1146 	char   *end;
1147 
1148 	static const struct {
1149 		const char *name;
1150 		uint32_t *flag;
1151 	} options[] = {
1152 		{ "extended", &aic79xx_extended },
1153 		{ "no_reset", &aic79xx_no_reset },
1154 		{ "verbose", &aic79xx_verbose },
1155 		{ "allow_memio", &aic79xx_allow_memio},
1156 #ifdef AHD_DEBUG
1157 		{ "debug", &ahd_debug },
1158 #endif
1159 		{ "periodic_otag", &aic79xx_periodic_otag },
1160 		{ "pci_parity", &aic79xx_pci_parity },
1161 		{ "seltime", &aic79xx_seltime },
1162 		{ "tag_info", NULL },
1163 		{ "global_tag_depth", NULL},
1164 		{ "slewrate", NULL },
1165 		{ "precomp", NULL },
1166 		{ "amplitude", NULL },
1167 		{ "slowcrc", &aic79xx_slowcrc },
1168 	};
1169 
1170 	end = strchr(s, '\0');
1171 
1172 	/*
1173 	 * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1174 	 * will never be 0 in this case.
1175 	 */
1176 	n = 0;
1177 
1178 	while ((p = strsep(&s, ",.")) != NULL) {
1179 		if (*p == '\0')
1180 			continue;
1181 		for (i = 0; i < ARRAY_SIZE(options); i++) {
1182 
1183 			n = strlen(options[i].name);
1184 			if (strncmp(options[i].name, p, n) == 0)
1185 				break;
1186 		}
1187 		if (i == ARRAY_SIZE(options))
1188 			continue;
1189 
1190 		if (strncmp(p, "global_tag_depth", n) == 0) {
1191 			ahd_linux_setup_tag_info_global(p + n);
1192 		} else if (strncmp(p, "tag_info", n) == 0) {
1193 			s = ahd_parse_brace_option("tag_info", p + n, end,
1194 			    2, ahd_linux_setup_tag_info, 0);
1195 		} else if (strncmp(p, "slewrate", n) == 0) {
1196 			s = ahd_parse_brace_option("slewrate",
1197 			    p + n, end, 1, ahd_linux_setup_iocell_info,
1198 			    AIC79XX_SLEWRATE_INDEX);
1199 		} else if (strncmp(p, "precomp", n) == 0) {
1200 			s = ahd_parse_brace_option("precomp",
1201 			    p + n, end, 1, ahd_linux_setup_iocell_info,
1202 			    AIC79XX_PRECOMP_INDEX);
1203 		} else if (strncmp(p, "amplitude", n) == 0) {
1204 			s = ahd_parse_brace_option("amplitude",
1205 			    p + n, end, 1, ahd_linux_setup_iocell_info,
1206 			    AIC79XX_AMPLITUDE_INDEX);
1207 		} else if (p[n] == ':') {
1208 			*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1209 		} else if (!strncmp(p, "verbose", n)) {
1210 			*(options[i].flag) = 1;
1211 		} else {
1212 			*(options[i].flag) ^= 0xFFFFFFFF;
1213 		}
1214 	}
1215 	return 1;
1216 }
1217 
1218 __setup("aic79xx=", aic79xx_setup);
1219 
1220 uint32_t aic79xx_verbose;
1221 
1222 int
1223 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
1224 {
1225 	char	buf[80];
1226 	struct	Scsi_Host *host;
1227 	char	*new_name;
1228 	u_long	s;
1229 	int	retval;
1230 
1231 	template->name = ahd->description;
1232 	host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1233 	if (host == NULL)
1234 		return (ENOMEM);
1235 
1236 	*((struct ahd_softc **)host->hostdata) = ahd;
1237 	ahd->platform_data->host = host;
1238 	host->can_queue = AHD_MAX_QUEUE;
1239 	host->cmd_per_lun = 2;
1240 	host->sg_tablesize = AHD_NSEG;
1241 	host->this_id = ahd->our_id;
1242 	host->irq = ahd->platform_data->irq;
1243 	host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1244 	host->max_lun = AHD_NUM_LUNS;
1245 	host->max_channel = 0;
1246 	host->sg_tablesize = AHD_NSEG;
1247 	ahd_lock(ahd, &s);
1248 	ahd_set_unit(ahd, ahd_linux_unit++);
1249 	ahd_unlock(ahd, &s);
1250 	sprintf(buf, "scsi%d", host->host_no);
1251 	new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1252 	if (new_name != NULL) {
1253 		strcpy(new_name, buf);
1254 		ahd_set_name(ahd, new_name);
1255 	}
1256 	host->unique_id = ahd->unit;
1257 	ahd_linux_initialize_scsi_bus(ahd);
1258 	ahd_intr_enable(ahd, TRUE);
1259 
1260 	host->transportt = ahd_linux_transport_template;
1261 
1262 	retval = scsi_add_host(host, &ahd->dev_softc->dev);
1263 	if (retval) {
1264 		printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
1265 		scsi_host_put(host);
1266 		return retval;
1267 	}
1268 
1269 	scsi_scan_host(host);
1270 	return 0;
1271 }
1272 
1273 /*
1274  * Place the SCSI bus into a known state by either resetting it,
1275  * or forcing transfer negotiations on the next command to any
1276  * target.
1277  */
1278 static void
1279 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1280 {
1281 	u_int target_id;
1282 	u_int numtarg;
1283 	unsigned long s;
1284 
1285 	target_id = 0;
1286 	numtarg = 0;
1287 
1288 	if (aic79xx_no_reset != 0)
1289 		ahd->flags &= ~AHD_RESET_BUS_A;
1290 
1291 	if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1292 		ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1293 	else
1294 		numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1295 
1296 	ahd_lock(ahd, &s);
1297 
1298 	/*
1299 	 * Force negotiation to async for all targets that
1300 	 * will not see an initial bus reset.
1301 	 */
1302 	for (; target_id < numtarg; target_id++) {
1303 		struct ahd_devinfo devinfo;
1304 		struct ahd_initiator_tinfo *tinfo;
1305 		struct ahd_tmode_tstate *tstate;
1306 
1307 		tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1308 					    target_id, &tstate);
1309 		ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1310 				    CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1311 		ahd_update_neg_request(ahd, &devinfo, tstate,
1312 				       tinfo, AHD_NEG_ALWAYS);
1313 	}
1314 	ahd_unlock(ahd, &s);
1315 	/* Give the bus some time to recover */
1316 	if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1317 		ahd_freeze_simq(ahd);
1318 		msleep(AIC79XX_RESET_DELAY);
1319 		ahd_release_simq(ahd);
1320 	}
1321 }
1322 
1323 int
1324 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1325 {
1326 	ahd->platform_data =
1327 	    kmalloc(sizeof(struct ahd_platform_data), GFP_ATOMIC);
1328 	if (ahd->platform_data == NULL)
1329 		return (ENOMEM);
1330 	memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
1331 	ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1332 	ahd_lockinit(ahd);
1333 	ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1334 	return (0);
1335 }
1336 
1337 void
1338 ahd_platform_free(struct ahd_softc *ahd)
1339 {
1340 	struct scsi_target *starget;
1341 	int i;
1342 
1343 	if (ahd->platform_data != NULL) {
1344 		/* destroy all of the device and target objects */
1345 		for (i = 0; i < AHD_NUM_TARGETS; i++) {
1346 			starget = ahd->platform_data->starget[i];
1347 			if (starget != NULL) {
1348 				ahd->platform_data->starget[i] = NULL;
1349 			}
1350 		}
1351 
1352 		if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1353 			free_irq(ahd->platform_data->irq, ahd);
1354 		if (ahd->tags[0] == BUS_SPACE_PIO
1355 		 && ahd->bshs[0].ioport != 0)
1356 			release_region(ahd->bshs[0].ioport, 256);
1357 		if (ahd->tags[1] == BUS_SPACE_PIO
1358 		 && ahd->bshs[1].ioport != 0)
1359 			release_region(ahd->bshs[1].ioport, 256);
1360 		if (ahd->tags[0] == BUS_SPACE_MEMIO
1361 		 && ahd->bshs[0].maddr != NULL) {
1362 			iounmap(ahd->bshs[0].maddr);
1363 			release_mem_region(ahd->platform_data->mem_busaddr,
1364 					   0x1000);
1365 		}
1366 		if (ahd->platform_data->host)
1367 			scsi_host_put(ahd->platform_data->host);
1368 
1369 		kfree(ahd->platform_data);
1370 	}
1371 }
1372 
1373 void
1374 ahd_platform_init(struct ahd_softc *ahd)
1375 {
1376 	/*
1377 	 * Lookup and commit any modified IO Cell options.
1378 	 */
1379 	if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
1380 		const struct ahd_linux_iocell_opts *iocell_opts;
1381 
1382 		iocell_opts = &aic79xx_iocell_info[ahd->unit];
1383 		if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1384 			AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1385 		if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1386 			AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1387 		if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1388 			AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1389 	}
1390 
1391 }
1392 
1393 void
1394 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1395 {
1396 	ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1397 				SCB_GET_CHANNEL(ahd, scb),
1398 				SCB_GET_LUN(scb), SCB_LIST_NULL,
1399 				ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1400 }
1401 
1402 void
1403 ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
1404 		      struct ahd_devinfo *devinfo, ahd_queue_alg alg)
1405 {
1406 	struct ahd_linux_device *dev;
1407 	int was_queuing;
1408 	int now_queuing;
1409 
1410 	if (sdev == NULL)
1411 		return;
1412 
1413 	dev = scsi_transport_device_data(sdev);
1414 
1415 	if (dev == NULL)
1416 		return;
1417 	was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1418 	switch (alg) {
1419 	default:
1420 	case AHD_QUEUE_NONE:
1421 		now_queuing = 0;
1422 		break;
1423 	case AHD_QUEUE_BASIC:
1424 		now_queuing = AHD_DEV_Q_BASIC;
1425 		break;
1426 	case AHD_QUEUE_TAGGED:
1427 		now_queuing = AHD_DEV_Q_TAGGED;
1428 		break;
1429 	}
1430 	if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1431 	 && (was_queuing != now_queuing)
1432 	 && (dev->active != 0)) {
1433 		dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1434 		dev->qfrozen++;
1435 	}
1436 
1437 	dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1438 	if (now_queuing) {
1439 		u_int usertags;
1440 
1441 		usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1442 		if (!was_queuing) {
1443 			/*
1444 			 * Start out aggressively and allow our
1445 			 * dynamic queue depth algorithm to take
1446 			 * care of the rest.
1447 			 */
1448 			dev->maxtags = usertags;
1449 			dev->openings = dev->maxtags - dev->active;
1450 		}
1451 		if (dev->maxtags == 0) {
1452 			/*
1453 			 * Queueing is disabled by the user.
1454 			 */
1455 			dev->openings = 1;
1456 		} else if (alg == AHD_QUEUE_TAGGED) {
1457 			dev->flags |= AHD_DEV_Q_TAGGED;
1458 			if (aic79xx_periodic_otag != 0)
1459 				dev->flags |= AHD_DEV_PERIODIC_OTAG;
1460 		} else
1461 			dev->flags |= AHD_DEV_Q_BASIC;
1462 	} else {
1463 		/* We can only have one opening. */
1464 		dev->maxtags = 0;
1465 		dev->openings =  1 - dev->active;
1466 	}
1467 
1468 	switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1469 	case AHD_DEV_Q_BASIC:
1470 		scsi_set_tag_type(sdev, MSG_SIMPLE_TASK);
1471 		scsi_activate_tcq(sdev, dev->openings + dev->active);
1472 		break;
1473 	case AHD_DEV_Q_TAGGED:
1474 		scsi_set_tag_type(sdev, MSG_ORDERED_TASK);
1475 		scsi_activate_tcq(sdev, dev->openings + dev->active);
1476 		break;
1477 	default:
1478 		/*
1479 		 * We allow the OS to queue 2 untagged transactions to
1480 		 * us at any time even though we can only execute them
1481 		 * serially on the controller/device.  This should
1482 		 * remove some latency.
1483 		 */
1484 		scsi_deactivate_tcq(sdev, 1);
1485 		break;
1486 	}
1487 }
1488 
1489 int
1490 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1491 			int lun, u_int tag, role_t role, uint32_t status)
1492 {
1493 	return 0;
1494 }
1495 
1496 static u_int
1497 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1498 {
1499 	static int warned_user;
1500 	u_int tags;
1501 
1502 	tags = 0;
1503 	if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1504 		if (ahd->unit >= ARRAY_SIZE(aic79xx_tag_info)) {
1505 
1506 			if (warned_user == 0) {
1507 				printk(KERN_WARNING
1508 "aic79xx: WARNING: Insufficient tag_info instances\n"
1509 "aic79xx: for installed controllers.  Using defaults\n"
1510 "aic79xx: Please update the aic79xx_tag_info array in\n"
1511 "aic79xx: the aic79xx_osm.c source file.\n");
1512 				warned_user++;
1513 			}
1514 			tags = AHD_MAX_QUEUE;
1515 		} else {
1516 			adapter_tag_info_t *tag_info;
1517 
1518 			tag_info = &aic79xx_tag_info[ahd->unit];
1519 			tags = tag_info->tag_commands[devinfo->target_offset];
1520 			if (tags > AHD_MAX_QUEUE)
1521 				tags = AHD_MAX_QUEUE;
1522 		}
1523 	}
1524 	return (tags);
1525 }
1526 
1527 /*
1528  * Determines the queue depth for a given device.
1529  */
1530 static void
1531 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1532 {
1533 	struct	ahd_devinfo devinfo;
1534 	u_int	tags;
1535 	struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1536 
1537 	ahd_compile_devinfo(&devinfo,
1538 			    ahd->our_id,
1539 			    sdev->sdev_target->id, sdev->lun,
1540 			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
1541 			    ROLE_INITIATOR);
1542 	tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1543 	if (tags != 0 && sdev->tagged_supported != 0) {
1544 
1545 		ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_TAGGED);
1546 		ahd_send_async(ahd, devinfo.channel, devinfo.target,
1547 			       devinfo.lun, AC_TRANSFER_NEG);
1548 		ahd_print_devinfo(ahd, &devinfo);
1549 		printk("Tagged Queuing enabled.  Depth %d\n", tags);
1550 	} else {
1551 		ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_NONE);
1552 		ahd_send_async(ahd, devinfo.channel, devinfo.target,
1553 			       devinfo.lun, AC_TRANSFER_NEG);
1554 	}
1555 }
1556 
1557 static int
1558 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1559 		      struct scsi_cmnd *cmd)
1560 {
1561 	struct	 scb *scb;
1562 	struct	 hardware_scb *hscb;
1563 	struct	 ahd_initiator_tinfo *tinfo;
1564 	struct	 ahd_tmode_tstate *tstate;
1565 	u_int	 col_idx;
1566 	uint16_t mask;
1567 	unsigned long flags;
1568 	int nseg;
1569 
1570 	nseg = scsi_dma_map(cmd);
1571 	if (nseg < 0)
1572 		return SCSI_MLQUEUE_HOST_BUSY;
1573 
1574 	ahd_lock(ahd, &flags);
1575 
1576 	/*
1577 	 * Get an scb to use.
1578 	 */
1579 	tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1580 				    cmd->device->id, &tstate);
1581 	if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1582 	 || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1583 		col_idx = AHD_NEVER_COL_IDX;
1584 	} else {
1585 		col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1586 					    cmd->device->lun);
1587 	}
1588 	if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1589 		ahd->flags |= AHD_RESOURCE_SHORTAGE;
1590 		ahd_unlock(ahd, &flags);
1591 		scsi_dma_unmap(cmd);
1592 		return SCSI_MLQUEUE_HOST_BUSY;
1593 	}
1594 
1595 	scb->io_ctx = cmd;
1596 	scb->platform_data->dev = dev;
1597 	hscb = scb->hscb;
1598 	cmd->host_scribble = (char *)scb;
1599 
1600 	/*
1601 	 * Fill out basics of the HSCB.
1602 	 */
1603 	hscb->control = 0;
1604 	hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1605 	hscb->lun = cmd->device->lun;
1606 	scb->hscb->task_management = 0;
1607 	mask = SCB_GET_TARGET_MASK(ahd, scb);
1608 
1609 	if ((ahd->user_discenable & mask) != 0)
1610 		hscb->control |= DISCENB;
1611 
1612 	if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1613 		scb->flags |= SCB_PACKETIZED;
1614 
1615 	if ((tstate->auto_negotiate & mask) != 0) {
1616 		scb->flags |= SCB_AUTO_NEGOTIATE;
1617 		scb->hscb->control |= MK_MESSAGE;
1618 	}
1619 
1620 	if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1621 		int	msg_bytes;
1622 		uint8_t tag_msgs[2];
1623 
1624 		msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1625 		if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1626 			hscb->control |= tag_msgs[0];
1627 			if (tag_msgs[0] == MSG_ORDERED_TASK)
1628 				dev->commands_since_idle_or_otag = 0;
1629 		} else
1630 		if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1631 		 && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1632 			hscb->control |= MSG_ORDERED_TASK;
1633 			dev->commands_since_idle_or_otag = 0;
1634 		} else {
1635 			hscb->control |= MSG_SIMPLE_TASK;
1636 		}
1637 	}
1638 
1639 	hscb->cdb_len = cmd->cmd_len;
1640 	memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1641 
1642 	scb->platform_data->xfer_len = 0;
1643 	ahd_set_residual(scb, 0);
1644 	ahd_set_sense_residual(scb, 0);
1645 	scb->sg_count = 0;
1646 
1647 	if (nseg > 0) {
1648 		void *sg = scb->sg_list;
1649 		struct scatterlist *cur_seg;
1650 		int i;
1651 
1652 		scb->platform_data->xfer_len = 0;
1653 
1654 		scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1655 			dma_addr_t addr;
1656 			bus_size_t len;
1657 
1658 			addr = sg_dma_address(cur_seg);
1659 			len = sg_dma_len(cur_seg);
1660 			scb->platform_data->xfer_len += len;
1661 			sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1662 					  i == (nseg - 1));
1663 		}
1664 	}
1665 
1666 	LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1667 	dev->openings--;
1668 	dev->active++;
1669 	dev->commands_issued++;
1670 
1671 	if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1672 		dev->commands_since_idle_or_otag++;
1673 	scb->flags |= SCB_ACTIVE;
1674 	ahd_queue_scb(ahd, scb);
1675 
1676 	ahd_unlock(ahd, &flags);
1677 
1678 	return 0;
1679 }
1680 
1681 /*
1682  * SCSI controller interrupt handler.
1683  */
1684 irqreturn_t
1685 ahd_linux_isr(int irq, void *dev_id)
1686 {
1687 	struct	ahd_softc *ahd;
1688 	u_long	flags;
1689 	int	ours;
1690 
1691 	ahd = (struct ahd_softc *) dev_id;
1692 	ahd_lock(ahd, &flags);
1693 	ours = ahd_intr(ahd);
1694 	ahd_unlock(ahd, &flags);
1695 	return IRQ_RETVAL(ours);
1696 }
1697 
1698 void
1699 ahd_send_async(struct ahd_softc *ahd, char channel,
1700 	       u_int target, u_int lun, ac_code code)
1701 {
1702 	switch (code) {
1703 	case AC_TRANSFER_NEG:
1704 	{
1705 		char	buf[80];
1706 		struct  scsi_target *starget;
1707 		struct	info_str info;
1708 		struct	ahd_initiator_tinfo *tinfo;
1709 		struct	ahd_tmode_tstate *tstate;
1710 		unsigned int target_ppr_options;
1711 
1712 		BUG_ON(target == CAM_TARGET_WILDCARD);
1713 
1714 		info.buffer = buf;
1715 		info.length = sizeof(buf);
1716 		info.offset = 0;
1717 		info.pos = 0;
1718 		tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1719 					    target, &tstate);
1720 
1721 		/*
1722 		 * Don't bother reporting results while
1723 		 * negotiations are still pending.
1724 		 */
1725 		if (tinfo->curr.period != tinfo->goal.period
1726 		 || tinfo->curr.width != tinfo->goal.width
1727 		 || tinfo->curr.offset != tinfo->goal.offset
1728 		 || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1729 			if (bootverbose == 0)
1730 				break;
1731 
1732 		/*
1733 		 * Don't bother reporting results that
1734 		 * are identical to those last reported.
1735 		 */
1736 		starget = ahd->platform_data->starget[target];
1737 		if (starget == NULL)
1738 			break;
1739 
1740 		target_ppr_options =
1741 			(spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1742 			+ (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1743 			+ (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1744 			+ (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1745 			+ (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1746 			+ (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1747 			+ (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1748 			+ (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1749 
1750 		if (tinfo->curr.period == spi_period(starget)
1751 		    && tinfo->curr.width == spi_width(starget)
1752 		    && tinfo->curr.offset == spi_offset(starget)
1753 		 && tinfo->curr.ppr_options == target_ppr_options)
1754 			if (bootverbose == 0)
1755 				break;
1756 
1757 		spi_period(starget) = tinfo->curr.period;
1758 		spi_width(starget) = tinfo->curr.width;
1759 		spi_offset(starget) = tinfo->curr.offset;
1760 		spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1761 		spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1762 		spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1763 		spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1764 		spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1765 		spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1766 		spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1767 		spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1768 		spi_display_xfer_agreement(starget);
1769 		break;
1770 	}
1771         case AC_SENT_BDR:
1772 	{
1773 		WARN_ON(lun != CAM_LUN_WILDCARD);
1774 		scsi_report_device_reset(ahd->platform_data->host,
1775 					 channel - 'A', target);
1776 		break;
1777 	}
1778         case AC_BUS_RESET:
1779 		if (ahd->platform_data->host != NULL) {
1780 			scsi_report_bus_reset(ahd->platform_data->host,
1781 					      channel - 'A');
1782 		}
1783                 break;
1784         default:
1785                 panic("ahd_send_async: Unexpected async event");
1786         }
1787 }
1788 
1789 /*
1790  * Calls the higher level scsi done function and frees the scb.
1791  */
1792 void
1793 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1794 {
1795 	struct scsi_cmnd *cmd;
1796 	struct	  ahd_linux_device *dev;
1797 
1798 	if ((scb->flags & SCB_ACTIVE) == 0) {
1799 		printk("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1800 		ahd_dump_card_state(ahd);
1801 		panic("Stopping for safety");
1802 	}
1803 	LIST_REMOVE(scb, pending_links);
1804 	cmd = scb->io_ctx;
1805 	dev = scb->platform_data->dev;
1806 	dev->active--;
1807 	dev->openings++;
1808 	if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1809 		cmd->result &= ~(CAM_DEV_QFRZN << 16);
1810 		dev->qfrozen--;
1811 	}
1812 	ahd_linux_unmap_scb(ahd, scb);
1813 
1814 	/*
1815 	 * Guard against stale sense data.
1816 	 * The Linux mid-layer assumes that sense
1817 	 * was retrieved anytime the first byte of
1818 	 * the sense buffer looks "sane".
1819 	 */
1820 	cmd->sense_buffer[0] = 0;
1821 	if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1822 		uint32_t amount_xferred;
1823 
1824 		amount_xferred =
1825 		    ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1826 		if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1827 #ifdef AHD_DEBUG
1828 			if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1829 				ahd_print_path(ahd, scb);
1830 				printk("Set CAM_UNCOR_PARITY\n");
1831 			}
1832 #endif
1833 			ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1834 #ifdef AHD_REPORT_UNDERFLOWS
1835 		/*
1836 		 * This code is disabled by default as some
1837 		 * clients of the SCSI system do not properly
1838 		 * initialize the underflow parameter.  This
1839 		 * results in spurious termination of commands
1840 		 * that complete as expected (e.g. underflow is
1841 		 * allowed as command can return variable amounts
1842 		 * of data.
1843 		 */
1844 		} else if (amount_xferred < scb->io_ctx->underflow) {
1845 			u_int i;
1846 
1847 			ahd_print_path(ahd, scb);
1848 			printk("CDB:");
1849 			for (i = 0; i < scb->io_ctx->cmd_len; i++)
1850 				printk(" 0x%x", scb->io_ctx->cmnd[i]);
1851 			printk("\n");
1852 			ahd_print_path(ahd, scb);
1853 			printk("Saw underflow (%ld of %ld bytes). "
1854 			       "Treated as error\n",
1855 				ahd_get_residual(scb),
1856 				ahd_get_transfer_length(scb));
1857 			ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1858 #endif
1859 		} else {
1860 			ahd_set_transaction_status(scb, CAM_REQ_CMP);
1861 		}
1862 	} else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1863 		ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1864 	}
1865 
1866 	if (dev->openings == 1
1867 	 && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1868 	 && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1869 		dev->tag_success_count++;
1870 	/*
1871 	 * Some devices deal with temporary internal resource
1872 	 * shortages by returning queue full.  When the queue
1873 	 * full occurrs, we throttle back.  Slowly try to get
1874 	 * back to our previous queue depth.
1875 	 */
1876 	if ((dev->openings + dev->active) < dev->maxtags
1877 	 && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1878 		dev->tag_success_count = 0;
1879 		dev->openings++;
1880 	}
1881 
1882 	if (dev->active == 0)
1883 		dev->commands_since_idle_or_otag = 0;
1884 
1885 	if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1886 		printk("Recovery SCB completes\n");
1887 		if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1888 		 || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1889 			ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1890 
1891 		if (ahd->platform_data->eh_done)
1892 			complete(ahd->platform_data->eh_done);
1893 	}
1894 
1895 	ahd_free_scb(ahd, scb);
1896 	ahd_linux_queue_cmd_complete(ahd, cmd);
1897 }
1898 
1899 static void
1900 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1901 			     struct scsi_device *sdev, struct scb *scb)
1902 {
1903 	struct	ahd_devinfo devinfo;
1904 	struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1905 
1906 	ahd_compile_devinfo(&devinfo,
1907 			    ahd->our_id,
1908 			    sdev->sdev_target->id, sdev->lun,
1909 			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
1910 			    ROLE_INITIATOR);
1911 
1912 	/*
1913 	 * We don't currently trust the mid-layer to
1914 	 * properly deal with queue full or busy.  So,
1915 	 * when one occurs, we tell the mid-layer to
1916 	 * unconditionally requeue the command to us
1917 	 * so that we can retry it ourselves.  We also
1918 	 * implement our own throttling mechanism so
1919 	 * we don't clobber the device with too many
1920 	 * commands.
1921 	 */
1922 	switch (ahd_get_scsi_status(scb)) {
1923 	default:
1924 		break;
1925 	case SCSI_STATUS_CHECK_COND:
1926 	case SCSI_STATUS_CMD_TERMINATED:
1927 	{
1928 		struct scsi_cmnd *cmd;
1929 
1930 		/*
1931 		 * Copy sense information to the OS's cmd
1932 		 * structure if it is available.
1933 		 */
1934 		cmd = scb->io_ctx;
1935 		if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1936 			struct scsi_status_iu_header *siu;
1937 			u_int sense_size;
1938 			u_int sense_offset;
1939 
1940 			if (scb->flags & SCB_SENSE) {
1941 				sense_size = min(sizeof(struct scsi_sense_data)
1942 					       - ahd_get_sense_residual(scb),
1943 						 (u_long)SCSI_SENSE_BUFFERSIZE);
1944 				sense_offset = 0;
1945 			} else {
1946 				/*
1947 				 * Copy only the sense data into the provided
1948 				 * buffer.
1949 				 */
1950 				siu = (struct scsi_status_iu_header *)
1951 				    scb->sense_data;
1952 				sense_size = min_t(size_t,
1953 						scsi_4btoul(siu->sense_length),
1954 						SCSI_SENSE_BUFFERSIZE);
1955 				sense_offset = SIU_SENSE_OFFSET(siu);
1956 			}
1957 
1958 			memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1959 			memcpy(cmd->sense_buffer,
1960 			       ahd_get_sense_buf(ahd, scb)
1961 			       + sense_offset, sense_size);
1962 			cmd->result |= (DRIVER_SENSE << 24);
1963 
1964 #ifdef AHD_DEBUG
1965 			if (ahd_debug & AHD_SHOW_SENSE) {
1966 				int i;
1967 
1968 				printk("Copied %d bytes of sense data at %d:",
1969 				       sense_size, sense_offset);
1970 				for (i = 0; i < sense_size; i++) {
1971 					if ((i & 0xF) == 0)
1972 						printk("\n");
1973 					printk("0x%x ", cmd->sense_buffer[i]);
1974 				}
1975 				printk("\n");
1976 			}
1977 #endif
1978 		}
1979 		break;
1980 	}
1981 	case SCSI_STATUS_QUEUE_FULL:
1982 		/*
1983 		 * By the time the core driver has returned this
1984 		 * command, all other commands that were queued
1985 		 * to us but not the device have been returned.
1986 		 * This ensures that dev->active is equal to
1987 		 * the number of commands actually queued to
1988 		 * the device.
1989 		 */
1990 		dev->tag_success_count = 0;
1991 		if (dev->active != 0) {
1992 			/*
1993 			 * Drop our opening count to the number
1994 			 * of commands currently outstanding.
1995 			 */
1996 			dev->openings = 0;
1997 #ifdef AHD_DEBUG
1998 			if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1999 				ahd_print_path(ahd, scb);
2000 				printk("Dropping tag count to %d\n",
2001 				       dev->active);
2002 			}
2003 #endif
2004 			if (dev->active == dev->tags_on_last_queuefull) {
2005 
2006 				dev->last_queuefull_same_count++;
2007 				/*
2008 				 * If we repeatedly see a queue full
2009 				 * at the same queue depth, this
2010 				 * device has a fixed number of tag
2011 				 * slots.  Lock in this tag depth
2012 				 * so we stop seeing queue fulls from
2013 				 * this device.
2014 				 */
2015 				if (dev->last_queuefull_same_count
2016 				 == AHD_LOCK_TAGS_COUNT) {
2017 					dev->maxtags = dev->active;
2018 					ahd_print_path(ahd, scb);
2019 					printk("Locking max tag count at %d\n",
2020 					       dev->active);
2021 				}
2022 			} else {
2023 				dev->tags_on_last_queuefull = dev->active;
2024 				dev->last_queuefull_same_count = 0;
2025 			}
2026 			ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
2027 			ahd_set_scsi_status(scb, SCSI_STATUS_OK);
2028 			ahd_platform_set_tags(ahd, sdev, &devinfo,
2029 				     (dev->flags & AHD_DEV_Q_BASIC)
2030 				   ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
2031 			break;
2032 		}
2033 		/*
2034 		 * Drop down to a single opening, and treat this
2035 		 * as if the target returned BUSY SCSI status.
2036 		 */
2037 		dev->openings = 1;
2038 		ahd_platform_set_tags(ahd, sdev, &devinfo,
2039 			     (dev->flags & AHD_DEV_Q_BASIC)
2040 			   ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
2041 		ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
2042 	}
2043 }
2044 
2045 static void
2046 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
2047 {
2048 	int status;
2049 	int new_status = DID_OK;
2050 	int do_fallback = 0;
2051 	int scsi_status;
2052 
2053 	/*
2054 	 * Map CAM error codes into Linux Error codes.  We
2055 	 * avoid the conversion so that the DV code has the
2056 	 * full error information available when making
2057 	 * state change decisions.
2058 	 */
2059 
2060 	status = ahd_cmd_get_transaction_status(cmd);
2061 	switch (status) {
2062 	case CAM_REQ_INPROG:
2063 	case CAM_REQ_CMP:
2064 		new_status = DID_OK;
2065 		break;
2066 	case CAM_AUTOSENSE_FAIL:
2067 		new_status = DID_ERROR;
2068 		/* Fallthrough */
2069 	case CAM_SCSI_STATUS_ERROR:
2070 		scsi_status = ahd_cmd_get_scsi_status(cmd);
2071 
2072 		switch(scsi_status) {
2073 		case SCSI_STATUS_CMD_TERMINATED:
2074 		case SCSI_STATUS_CHECK_COND:
2075 			if ((cmd->result >> 24) != DRIVER_SENSE) {
2076 				do_fallback = 1;
2077 			} else {
2078 				struct scsi_sense_data *sense;
2079 
2080 				sense = (struct scsi_sense_data *)
2081 					cmd->sense_buffer;
2082 				if (sense->extra_len >= 5 &&
2083 				    (sense->add_sense_code == 0x47
2084 				     || sense->add_sense_code == 0x48))
2085 					do_fallback = 1;
2086 			}
2087 			break;
2088 		default:
2089 			break;
2090 		}
2091 		break;
2092 	case CAM_REQ_ABORTED:
2093 		new_status = DID_ABORT;
2094 		break;
2095 	case CAM_BUSY:
2096 		new_status = DID_BUS_BUSY;
2097 		break;
2098 	case CAM_REQ_INVALID:
2099 	case CAM_PATH_INVALID:
2100 		new_status = DID_BAD_TARGET;
2101 		break;
2102 	case CAM_SEL_TIMEOUT:
2103 		new_status = DID_NO_CONNECT;
2104 		break;
2105 	case CAM_SCSI_BUS_RESET:
2106 	case CAM_BDR_SENT:
2107 		new_status = DID_RESET;
2108 		break;
2109 	case CAM_UNCOR_PARITY:
2110 		new_status = DID_PARITY;
2111 		do_fallback = 1;
2112 		break;
2113 	case CAM_CMD_TIMEOUT:
2114 		new_status = DID_TIME_OUT;
2115 		do_fallback = 1;
2116 		break;
2117 	case CAM_REQ_CMP_ERR:
2118 	case CAM_UNEXP_BUSFREE:
2119 	case CAM_DATA_RUN_ERR:
2120 		new_status = DID_ERROR;
2121 		do_fallback = 1;
2122 		break;
2123 	case CAM_UA_ABORT:
2124 	case CAM_NO_HBA:
2125 	case CAM_SEQUENCE_FAIL:
2126 	case CAM_CCB_LEN_ERR:
2127 	case CAM_PROVIDE_FAIL:
2128 	case CAM_REQ_TERMIO:
2129 	case CAM_UNREC_HBA_ERROR:
2130 	case CAM_REQ_TOO_BIG:
2131 		new_status = DID_ERROR;
2132 		break;
2133 	case CAM_REQUEUE_REQ:
2134 		new_status = DID_REQUEUE;
2135 		break;
2136 	default:
2137 		/* We should never get here */
2138 		new_status = DID_ERROR;
2139 		break;
2140 	}
2141 
2142 	if (do_fallback) {
2143 		printk("%s: device overrun (status %x) on %d:%d:%d\n",
2144 		       ahd_name(ahd), status, cmd->device->channel,
2145 		       cmd->device->id, cmd->device->lun);
2146 	}
2147 
2148 	ahd_cmd_set_transaction_status(cmd, new_status);
2149 
2150 	cmd->scsi_done(cmd);
2151 }
2152 
2153 static void
2154 ahd_freeze_simq(struct ahd_softc *ahd)
2155 {
2156 	scsi_block_requests(ahd->platform_data->host);
2157 }
2158 
2159 static void
2160 ahd_release_simq(struct ahd_softc *ahd)
2161 {
2162 	scsi_unblock_requests(ahd->platform_data->host);
2163 }
2164 
2165 static int
2166 ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd)
2167 {
2168 	struct ahd_softc *ahd;
2169 	struct ahd_linux_device *dev;
2170 	struct scb *pending_scb;
2171 	u_int  saved_scbptr;
2172 	u_int  active_scbptr;
2173 	u_int  last_phase;
2174 	u_int  saved_scsiid;
2175 	u_int  cdb_byte;
2176 	int    retval;
2177 	int    was_paused;
2178 	int    paused;
2179 	int    wait;
2180 	int    disconnected;
2181 	ahd_mode_state saved_modes;
2182 	unsigned long flags;
2183 
2184 	pending_scb = NULL;
2185 	paused = FALSE;
2186 	wait = FALSE;
2187 	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
2188 
2189 	scmd_printk(KERN_INFO, cmd,
2190 		    "Attempting to queue an ABORT message:");
2191 
2192 	printk("CDB:");
2193 	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2194 		printk(" 0x%x", cmd->cmnd[cdb_byte]);
2195 	printk("\n");
2196 
2197 	ahd_lock(ahd, &flags);
2198 
2199 	/*
2200 	 * First determine if we currently own this command.
2201 	 * Start by searching the device queue.  If not found
2202 	 * there, check the pending_scb list.  If not found
2203 	 * at all, and the system wanted us to just abort the
2204 	 * command, return success.
2205 	 */
2206 	dev = scsi_transport_device_data(cmd->device);
2207 
2208 	if (dev == NULL) {
2209 		/*
2210 		 * No target device for this command exists,
2211 		 * so we must not still own the command.
2212 		 */
2213 		scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
2214 		retval = SUCCESS;
2215 		goto no_cmd;
2216 	}
2217 
2218 	/*
2219 	 * See if we can find a matching cmd in the pending list.
2220 	 */
2221 	LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2222 		if (pending_scb->io_ctx == cmd)
2223 			break;
2224 	}
2225 
2226 	if (pending_scb == NULL) {
2227 		scmd_printk(KERN_INFO, cmd, "Command not found\n");
2228 		goto no_cmd;
2229 	}
2230 
2231 	if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2232 		/*
2233 		 * We can't queue two recovery actions using the same SCB
2234 		 */
2235 		retval = FAILED;
2236 		goto  done;
2237 	}
2238 
2239 	/*
2240 	 * Ensure that the card doesn't do anything
2241 	 * behind our back.  Also make sure that we
2242 	 * didn't "just" miss an interrupt that would
2243 	 * affect this cmd.
2244 	 */
2245 	was_paused = ahd_is_paused(ahd);
2246 	ahd_pause_and_flushwork(ahd);
2247 	paused = TRUE;
2248 
2249 	if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2250 		scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2251 		goto no_cmd;
2252 	}
2253 
2254 	printk("%s: At time of recovery, card was %spaused\n",
2255 	       ahd_name(ahd), was_paused ? "" : "not ");
2256 	ahd_dump_card_state(ahd);
2257 
2258 	disconnected = TRUE;
2259 	if (ahd_search_qinfifo(ahd, cmd->device->id,
2260 			       cmd->device->channel + 'A',
2261 			       cmd->device->lun,
2262 			       pending_scb->hscb->tag,
2263 			       ROLE_INITIATOR, CAM_REQ_ABORTED,
2264 			       SEARCH_COMPLETE) > 0) {
2265 		printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2266 		       ahd_name(ahd), cmd->device->channel,
2267 		       cmd->device->id, cmd->device->lun);
2268 		retval = SUCCESS;
2269 		goto done;
2270 	}
2271 
2272 	saved_modes = ahd_save_modes(ahd);
2273 	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2274 	last_phase = ahd_inb(ahd, LASTPHASE);
2275 	saved_scbptr = ahd_get_scbptr(ahd);
2276 	active_scbptr = saved_scbptr;
2277 	if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2278 		struct scb *bus_scb;
2279 
2280 		bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2281 		if (bus_scb == pending_scb)
2282 			disconnected = FALSE;
2283 	}
2284 
2285 	/*
2286 	 * At this point, pending_scb is the scb associated with the
2287 	 * passed in command.  That command is currently active on the
2288 	 * bus or is in the disconnected state.
2289 	 */
2290 	saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
2291 	if (last_phase != P_BUSFREE
2292 	    && SCB_GET_TAG(pending_scb) == active_scbptr) {
2293 
2294 		/*
2295 		 * We're active on the bus, so assert ATN
2296 		 * and hope that the target responds.
2297 		 */
2298 		pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2299 		pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2300 		ahd_outb(ahd, MSG_OUT, HOST_MSG);
2301 		ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2302 		scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2303 		wait = TRUE;
2304 	} else if (disconnected) {
2305 
2306 		/*
2307 		 * Actually re-queue this SCB in an attempt
2308 		 * to select the device before it reconnects.
2309 		 */
2310 		pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2311 		ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2312 		pending_scb->hscb->cdb_len = 0;
2313 		pending_scb->hscb->task_attribute = 0;
2314 		pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2315 
2316 		if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2317 			/*
2318 			 * Mark the SCB has having an outstanding
2319 			 * task management function.  Should the command
2320 			 * complete normally before the task management
2321 			 * function can be sent, the host will be notified
2322 			 * to abort our requeued SCB.
2323 			 */
2324 			ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2325 				 pending_scb->hscb->task_management);
2326 		} else {
2327 			/*
2328 			 * If non-packetized, set the MK_MESSAGE control
2329 			 * bit indicating that we desire to send a message.
2330 			 * We also set the disconnected flag since there is
2331 			 * no guarantee that our SCB control byte matches
2332 			 * the version on the card.  We don't want the
2333 			 * sequencer to abort the command thinking an
2334 			 * unsolicited reselection occurred.
2335 			 */
2336 			pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2337 
2338 			/*
2339 			 * The sequencer will never re-reference the
2340 			 * in-core SCB.  To make sure we are notified
2341 			 * during reselection, set the MK_MESSAGE flag in
2342 			 * the card's copy of the SCB.
2343 			 */
2344 			ahd_outb(ahd, SCB_CONTROL,
2345 				 ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2346 		}
2347 
2348 		/*
2349 		 * Clear out any entries in the QINFIFO first
2350 		 * so we are the next SCB for this target
2351 		 * to run.
2352 		 */
2353 		ahd_search_qinfifo(ahd, cmd->device->id,
2354 				   cmd->device->channel + 'A', cmd->device->lun,
2355 				   SCB_LIST_NULL, ROLE_INITIATOR,
2356 				   CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2357 		ahd_qinfifo_requeue_tail(ahd, pending_scb);
2358 		ahd_set_scbptr(ahd, saved_scbptr);
2359 		ahd_print_path(ahd, pending_scb);
2360 		printk("Device is disconnected, re-queuing SCB\n");
2361 		wait = TRUE;
2362 	} else {
2363 		scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2364 		retval = FAILED;
2365 		goto done;
2366 	}
2367 
2368 no_cmd:
2369 	/*
2370 	 * Our assumption is that if we don't have the command, no
2371 	 * recovery action was required, so we return success.  Again,
2372 	 * the semantics of the mid-layer recovery engine are not
2373 	 * well defined, so this may change in time.
2374 	 */
2375 	retval = SUCCESS;
2376 done:
2377 	if (paused)
2378 		ahd_unpause(ahd);
2379 	if (wait) {
2380 		DECLARE_COMPLETION_ONSTACK(done);
2381 
2382 		ahd->platform_data->eh_done = &done;
2383 		ahd_unlock(ahd, &flags);
2384 
2385 		printk("%s: Recovery code sleeping\n", ahd_name(ahd));
2386 		if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2387 			ahd_lock(ahd, &flags);
2388 			ahd->platform_data->eh_done = NULL;
2389 			ahd_unlock(ahd, &flags);
2390 			printk("%s: Timer Expired (active %d)\n",
2391 			       ahd_name(ahd), dev->active);
2392 			retval = FAILED;
2393 		}
2394 		printk("Recovery code awake\n");
2395 	} else
2396 		ahd_unlock(ahd, &flags);
2397 
2398 	if (retval != SUCCESS)
2399 		printk("%s: Command abort returning 0x%x\n",
2400 		       ahd_name(ahd), retval);
2401 
2402 	return retval;
2403 }
2404 
2405 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2406 {
2407 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2408 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2409 	struct ahd_devinfo devinfo;
2410 	unsigned long flags;
2411 
2412 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2413 			    starget->channel + 'A', ROLE_INITIATOR);
2414 	ahd_lock(ahd, &flags);
2415 	ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2416 	ahd_unlock(ahd, &flags);
2417 }
2418 
2419 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2420 {
2421 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2422 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2423 	struct ahd_tmode_tstate *tstate;
2424 	struct ahd_initiator_tinfo *tinfo
2425 		= ahd_fetch_transinfo(ahd,
2426 				      starget->channel + 'A',
2427 				      shost->this_id, starget->id, &tstate);
2428 	struct ahd_devinfo devinfo;
2429 	unsigned int ppr_options = tinfo->goal.ppr_options;
2430 	unsigned int dt;
2431 	unsigned long flags;
2432 	unsigned long offset = tinfo->goal.offset;
2433 
2434 #ifdef AHD_DEBUG
2435 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2436 		printk("%s: set period to %d\n", ahd_name(ahd), period);
2437 #endif
2438 	if (offset == 0)
2439 		offset = MAX_OFFSET;
2440 
2441 	if (period < 8)
2442 		period = 8;
2443 	if (period < 10) {
2444 		if (spi_max_width(starget)) {
2445 			ppr_options |= MSG_EXT_PPR_DT_REQ;
2446 			if (period == 8)
2447 				ppr_options |= MSG_EXT_PPR_IU_REQ;
2448 		} else
2449 			period = 10;
2450 	}
2451 
2452 	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2453 
2454 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2455 			    starget->channel + 'A', ROLE_INITIATOR);
2456 
2457 	/* all PPR requests apart from QAS require wide transfers */
2458 	if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2459 		if (spi_width(starget) == 0)
2460 			ppr_options &= MSG_EXT_PPR_QAS_REQ;
2461 	}
2462 
2463 	ahd_find_syncrate(ahd, &period, &ppr_options,
2464 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2465 
2466 	ahd_lock(ahd, &flags);
2467 	ahd_set_syncrate(ahd, &devinfo, period, offset,
2468 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2469 	ahd_unlock(ahd, &flags);
2470 }
2471 
2472 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2473 {
2474 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2475 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2476 	struct ahd_tmode_tstate *tstate;
2477 	struct ahd_initiator_tinfo *tinfo
2478 		= ahd_fetch_transinfo(ahd,
2479 				      starget->channel + 'A',
2480 				      shost->this_id, starget->id, &tstate);
2481 	struct ahd_devinfo devinfo;
2482 	unsigned int ppr_options = 0;
2483 	unsigned int period = 0;
2484 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2485 	unsigned long flags;
2486 
2487 #ifdef AHD_DEBUG
2488 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2489 		printk("%s: set offset to %d\n", ahd_name(ahd), offset);
2490 #endif
2491 
2492 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2493 			    starget->channel + 'A', ROLE_INITIATOR);
2494 	if (offset != 0) {
2495 		period = tinfo->goal.period;
2496 		ppr_options = tinfo->goal.ppr_options;
2497 		ahd_find_syncrate(ahd, &period, &ppr_options,
2498 				  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2499 	}
2500 
2501 	ahd_lock(ahd, &flags);
2502 	ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2503 			 AHD_TRANS_GOAL, FALSE);
2504 	ahd_unlock(ahd, &flags);
2505 }
2506 
2507 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
2508 {
2509 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2510 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2511 	struct ahd_tmode_tstate *tstate;
2512 	struct ahd_initiator_tinfo *tinfo
2513 		= ahd_fetch_transinfo(ahd,
2514 				      starget->channel + 'A',
2515 				      shost->this_id, starget->id, &tstate);
2516 	struct ahd_devinfo devinfo;
2517 	unsigned int ppr_options = tinfo->goal.ppr_options
2518 		& ~MSG_EXT_PPR_DT_REQ;
2519 	unsigned int period = tinfo->goal.period;
2520 	unsigned int width = tinfo->goal.width;
2521 	unsigned long flags;
2522 
2523 #ifdef AHD_DEBUG
2524 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2525 		printk("%s: %s DT\n", ahd_name(ahd),
2526 		       dt ? "enabling" : "disabling");
2527 #endif
2528 	if (dt && spi_max_width(starget)) {
2529 		ppr_options |= MSG_EXT_PPR_DT_REQ;
2530 		if (!width)
2531 			ahd_linux_set_width(starget, 1);
2532 	} else {
2533 		if (period <= 9)
2534 			period = 10; /* If resetting DT, period must be >= 25ns */
2535 		/* IU is invalid without DT set */
2536 		ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2537 	}
2538 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2539 			    starget->channel + 'A', ROLE_INITIATOR);
2540 	ahd_find_syncrate(ahd, &period, &ppr_options,
2541 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2542 
2543 	ahd_lock(ahd, &flags);
2544 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2545 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2546 	ahd_unlock(ahd, &flags);
2547 }
2548 
2549 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2550 {
2551 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2552 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2553 	struct ahd_tmode_tstate *tstate;
2554 	struct ahd_initiator_tinfo *tinfo
2555 		= ahd_fetch_transinfo(ahd,
2556 				      starget->channel + 'A',
2557 				      shost->this_id, starget->id, &tstate);
2558 	struct ahd_devinfo devinfo;
2559 	unsigned int ppr_options = tinfo->goal.ppr_options
2560 		& ~MSG_EXT_PPR_QAS_REQ;
2561 	unsigned int period = tinfo->goal.period;
2562 	unsigned int dt;
2563 	unsigned long flags;
2564 
2565 #ifdef AHD_DEBUG
2566 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2567 		printk("%s: %s QAS\n", ahd_name(ahd),
2568 		       qas ? "enabling" : "disabling");
2569 #endif
2570 
2571 	if (qas) {
2572 		ppr_options |= MSG_EXT_PPR_QAS_REQ;
2573 	}
2574 
2575 	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2576 
2577 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2578 			    starget->channel + 'A', ROLE_INITIATOR);
2579 	ahd_find_syncrate(ahd, &period, &ppr_options,
2580 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2581 
2582 	ahd_lock(ahd, &flags);
2583 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2584 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2585 	ahd_unlock(ahd, &flags);
2586 }
2587 
2588 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2589 {
2590 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2591 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2592 	struct ahd_tmode_tstate *tstate;
2593 	struct ahd_initiator_tinfo *tinfo
2594 		= ahd_fetch_transinfo(ahd,
2595 				      starget->channel + 'A',
2596 				      shost->this_id, starget->id, &tstate);
2597 	struct ahd_devinfo devinfo;
2598 	unsigned int ppr_options = tinfo->goal.ppr_options
2599 		& ~MSG_EXT_PPR_IU_REQ;
2600 	unsigned int period = tinfo->goal.period;
2601 	unsigned int dt;
2602 	unsigned long flags;
2603 
2604 #ifdef AHD_DEBUG
2605 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2606 		printk("%s: %s IU\n", ahd_name(ahd),
2607 		       iu ? "enabling" : "disabling");
2608 #endif
2609 
2610 	if (iu && spi_max_width(starget)) {
2611 		ppr_options |= MSG_EXT_PPR_IU_REQ;
2612 		ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2613 	}
2614 
2615 	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2616 
2617 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2618 			    starget->channel + 'A', ROLE_INITIATOR);
2619 	ahd_find_syncrate(ahd, &period, &ppr_options,
2620 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2621 
2622 	ahd_lock(ahd, &flags);
2623 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2624 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2625 	ahd_unlock(ahd, &flags);
2626 }
2627 
2628 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2629 {
2630 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2631 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2632 	struct ahd_tmode_tstate *tstate;
2633 	struct ahd_initiator_tinfo *tinfo
2634 		= ahd_fetch_transinfo(ahd,
2635 				      starget->channel + 'A',
2636 				      shost->this_id, starget->id, &tstate);
2637 	struct ahd_devinfo devinfo;
2638 	unsigned int ppr_options = tinfo->goal.ppr_options
2639 		& ~MSG_EXT_PPR_RD_STRM;
2640 	unsigned int period = tinfo->goal.period;
2641 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2642 	unsigned long flags;
2643 
2644 #ifdef AHD_DEBUG
2645 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2646 		printk("%s: %s Read Streaming\n", ahd_name(ahd),
2647 		       rdstrm  ? "enabling" : "disabling");
2648 #endif
2649 
2650 	if (rdstrm && spi_max_width(starget))
2651 		ppr_options |= MSG_EXT_PPR_RD_STRM;
2652 
2653 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2654 			    starget->channel + 'A', ROLE_INITIATOR);
2655 	ahd_find_syncrate(ahd, &period, &ppr_options,
2656 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2657 
2658 	ahd_lock(ahd, &flags);
2659 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2660 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2661 	ahd_unlock(ahd, &flags);
2662 }
2663 
2664 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2665 {
2666 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2667 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2668 	struct ahd_tmode_tstate *tstate;
2669 	struct ahd_initiator_tinfo *tinfo
2670 		= ahd_fetch_transinfo(ahd,
2671 				      starget->channel + 'A',
2672 				      shost->this_id, starget->id, &tstate);
2673 	struct ahd_devinfo devinfo;
2674 	unsigned int ppr_options = tinfo->goal.ppr_options
2675 		& ~MSG_EXT_PPR_WR_FLOW;
2676 	unsigned int period = tinfo->goal.period;
2677 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2678 	unsigned long flags;
2679 
2680 #ifdef AHD_DEBUG
2681 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2682 		printk("%s: %s Write Flow Control\n", ahd_name(ahd),
2683 		       wrflow ? "enabling" : "disabling");
2684 #endif
2685 
2686 	if (wrflow && spi_max_width(starget))
2687 		ppr_options |= MSG_EXT_PPR_WR_FLOW;
2688 
2689 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2690 			    starget->channel + 'A', ROLE_INITIATOR);
2691 	ahd_find_syncrate(ahd, &period, &ppr_options,
2692 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2693 
2694 	ahd_lock(ahd, &flags);
2695 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2696 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2697 	ahd_unlock(ahd, &flags);
2698 }
2699 
2700 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2701 {
2702 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2703 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2704 	struct ahd_tmode_tstate *tstate;
2705 	struct ahd_initiator_tinfo *tinfo
2706 		= ahd_fetch_transinfo(ahd,
2707 				      starget->channel + 'A',
2708 				      shost->this_id, starget->id, &tstate);
2709 	struct ahd_devinfo devinfo;
2710 	unsigned int ppr_options = tinfo->goal.ppr_options
2711 		& ~MSG_EXT_PPR_RTI;
2712 	unsigned int period = tinfo->goal.period;
2713 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2714 	unsigned long flags;
2715 
2716 	if ((ahd->features & AHD_RTI) == 0) {
2717 #ifdef AHD_DEBUG
2718 		if ((ahd_debug & AHD_SHOW_DV) != 0)
2719 			printk("%s: RTI not available\n", ahd_name(ahd));
2720 #endif
2721 		return;
2722 	}
2723 
2724 #ifdef AHD_DEBUG
2725 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2726 		printk("%s: %s RTI\n", ahd_name(ahd),
2727 		       rti ? "enabling" : "disabling");
2728 #endif
2729 
2730 	if (rti && spi_max_width(starget))
2731 		ppr_options |= MSG_EXT_PPR_RTI;
2732 
2733 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2734 			    starget->channel + 'A', ROLE_INITIATOR);
2735 	ahd_find_syncrate(ahd, &period, &ppr_options,
2736 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2737 
2738 	ahd_lock(ahd, &flags);
2739 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2740 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2741 	ahd_unlock(ahd, &flags);
2742 }
2743 
2744 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2745 {
2746 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2747 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2748 	struct ahd_tmode_tstate *tstate;
2749 	struct ahd_initiator_tinfo *tinfo
2750 		= ahd_fetch_transinfo(ahd,
2751 				      starget->channel + 'A',
2752 				      shost->this_id, starget->id, &tstate);
2753 	struct ahd_devinfo devinfo;
2754 	unsigned int ppr_options = tinfo->goal.ppr_options
2755 		& ~MSG_EXT_PPR_PCOMP_EN;
2756 	unsigned int period = tinfo->goal.period;
2757 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2758 	unsigned long flags;
2759 
2760 #ifdef AHD_DEBUG
2761 	if ((ahd_debug & AHD_SHOW_DV) != 0)
2762 		printk("%s: %s Precompensation\n", ahd_name(ahd),
2763 		       pcomp ? "Enable" : "Disable");
2764 #endif
2765 
2766 	if (pcomp && spi_max_width(starget)) {
2767 		uint8_t precomp;
2768 
2769 		if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
2770 			const struct ahd_linux_iocell_opts *iocell_opts;
2771 
2772 			iocell_opts = &aic79xx_iocell_info[ahd->unit];
2773 			precomp = iocell_opts->precomp;
2774 		} else {
2775 			precomp = AIC79XX_DEFAULT_PRECOMP;
2776 		}
2777 		ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2778 		AHD_SET_PRECOMP(ahd, precomp);
2779 	} else {
2780 		AHD_SET_PRECOMP(ahd, 0);
2781 	}
2782 
2783 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2784 			    starget->channel + 'A', ROLE_INITIATOR);
2785 	ahd_find_syncrate(ahd, &period, &ppr_options,
2786 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2787 
2788 	ahd_lock(ahd, &flags);
2789 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2790 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2791 	ahd_unlock(ahd, &flags);
2792 }
2793 
2794 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2795 {
2796 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2797 	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2798 	struct ahd_tmode_tstate *tstate;
2799 	struct ahd_initiator_tinfo *tinfo
2800 		= ahd_fetch_transinfo(ahd,
2801 				      starget->channel + 'A',
2802 				      shost->this_id, starget->id, &tstate);
2803 	struct ahd_devinfo devinfo;
2804 	unsigned int ppr_options = tinfo->goal.ppr_options
2805 		& ~MSG_EXT_PPR_HOLD_MCS;
2806 	unsigned int period = tinfo->goal.period;
2807 	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2808 	unsigned long flags;
2809 
2810 	if (hold && spi_max_width(starget))
2811 		ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2812 
2813 	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2814 			    starget->channel + 'A', ROLE_INITIATOR);
2815 	ahd_find_syncrate(ahd, &period, &ppr_options,
2816 			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2817 
2818 	ahd_lock(ahd, &flags);
2819 	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2820 			 ppr_options, AHD_TRANS_GOAL, FALSE);
2821 	ahd_unlock(ahd, &flags);
2822 }
2823 
2824 static void ahd_linux_get_signalling(struct Scsi_Host *shost)
2825 {
2826 	struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
2827 	unsigned long flags;
2828 	u8 mode;
2829 
2830 	ahd_lock(ahd, &flags);
2831 	ahd_pause(ahd);
2832 	mode = ahd_inb(ahd, SBLKCTL);
2833 	ahd_unpause(ahd);
2834 	ahd_unlock(ahd, &flags);
2835 
2836 	if (mode & ENAB40)
2837 		spi_signalling(shost) = SPI_SIGNAL_LVD;
2838 	else if (mode & ENAB20)
2839 		spi_signalling(shost) = SPI_SIGNAL_SE;
2840 	else
2841 		spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2842 }
2843 
2844 static struct spi_function_template ahd_linux_transport_functions = {
2845 	.set_offset	= ahd_linux_set_offset,
2846 	.show_offset	= 1,
2847 	.set_period	= ahd_linux_set_period,
2848 	.show_period	= 1,
2849 	.set_width	= ahd_linux_set_width,
2850 	.show_width	= 1,
2851 	.set_dt		= ahd_linux_set_dt,
2852 	.show_dt	= 1,
2853 	.set_iu		= ahd_linux_set_iu,
2854 	.show_iu	= 1,
2855 	.set_qas	= ahd_linux_set_qas,
2856 	.show_qas	= 1,
2857 	.set_rd_strm	= ahd_linux_set_rd_strm,
2858 	.show_rd_strm	= 1,
2859 	.set_wr_flow	= ahd_linux_set_wr_flow,
2860 	.show_wr_flow	= 1,
2861 	.set_rti	= ahd_linux_set_rti,
2862 	.show_rti	= 1,
2863 	.set_pcomp_en	= ahd_linux_set_pcomp_en,
2864 	.show_pcomp_en	= 1,
2865 	.set_hold_mcs	= ahd_linux_set_hold_mcs,
2866 	.show_hold_mcs	= 1,
2867 	.get_signalling = ahd_linux_get_signalling,
2868 };
2869 
2870 static int __init
2871 ahd_linux_init(void)
2872 {
2873 	int	error = 0;
2874 
2875 	/*
2876 	 * If we've been passed any parameters, process them now.
2877 	 */
2878 	if (aic79xx)
2879 		aic79xx_setup(aic79xx);
2880 
2881 	ahd_linux_transport_template =
2882 		spi_attach_transport(&ahd_linux_transport_functions);
2883 	if (!ahd_linux_transport_template)
2884 		return -ENODEV;
2885 
2886 	scsi_transport_reserve_device(ahd_linux_transport_template,
2887 				      sizeof(struct ahd_linux_device));
2888 
2889 	error = ahd_linux_pci_init();
2890 	if (error)
2891 		spi_release_transport(ahd_linux_transport_template);
2892 	return error;
2893 }
2894 
2895 static void __exit
2896 ahd_linux_exit(void)
2897 {
2898 	ahd_linux_pci_exit();
2899 	spi_release_transport(ahd_linux_transport_template);
2900 }
2901 
2902 module_init(ahd_linux_init);
2903 module_exit(ahd_linux_exit);
2904