[SCSI] aic79xx: sane pci probing
[linux-2.6] / drivers / scsi / aic7xxx / aic79xx_osm.c
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 /*
52  * Include aiclib.c as part of our
53  * "module dependencies are hard" work around.
54  */
55 #include "aiclib.c"
56
57 #include <linux/init.h>         /* __setup */
58 #include <linux/mm.h>           /* For fetching system memory size */
59 #include <linux/blkdev.h>               /* For block_size() */
60 #include <linux/delay.h>        /* For ssleep/msleep */
61
62 /*
63  * Bucket size for counting good commands in between bad ones.
64  */
65 #define AHD_LINUX_ERR_THRESH    1000
66
67 /*
68  * Set this to the delay in seconds after SCSI bus reset.
69  * Note, we honor this only for the initial bus reset.
70  * The scsi error recovery code performs its own bus settle
71  * delay handling for error recovery actions.
72  */
73 #ifdef CONFIG_AIC79XX_RESET_DELAY_MS
74 #define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
75 #else
76 #define AIC79XX_RESET_DELAY 5000
77 #endif
78
79 /*
80  * To change the default number of tagged transactions allowed per-device,
81  * add a line to the lilo.conf file like:
82  * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
83  * which will result in the first four devices on the first two
84  * controllers being set to a tagged queue depth of 32.
85  *
86  * The tag_commands is an array of 16 to allow for wide and twin adapters.
87  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
88  * for channel 1.
89  */
90 typedef struct {
91         uint16_t tag_commands[16];      /* Allow for wide/twin adapters. */
92 } adapter_tag_info_t;
93
94 /*
95  * Modify this as you see fit for your system.
96  *
97  * 0                    tagged queuing disabled
98  * 1 <= n <= 253        n == max tags ever dispatched.
99  *
100  * The driver will throttle the number of commands dispatched to a
101  * device if it returns queue full.  For devices with a fixed maximum
102  * queue depth, the driver will eventually determine this depth and
103  * lock it in (a console message is printed to indicate that a lock
104  * has occurred).  On some devices, queue full is returned for a temporary
105  * resource shortage.  These devices will return queue full at varying
106  * depths.  The driver will throttle back when the queue fulls occur and
107  * attempt to slowly increase the depth over time as the device recovers
108  * from the resource shortage.
109  *
110  * In this example, the first line will disable tagged queueing for all
111  * the devices on the first probed aic79xx adapter.
112  *
113  * The second line enables tagged queueing with 4 commands/LUN for IDs
114  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
115  * driver to attempt to use up to 64 tags for ID 1.
116  *
117  * The third line is the same as the first line.
118  *
119  * The fourth line disables tagged queueing for devices 0 and 3.  It
120  * enables tagged queueing for the other IDs, with 16 commands/LUN
121  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
122  * IDs 2, 5-7, and 9-15.
123  */
124
125 /*
126  * NOTE: The below structure is for reference only, the actual structure
127  *       to modify in order to change things is just below this comment block.
128 adapter_tag_info_t aic79xx_tag_info[] =
129 {
130         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
131         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
132         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
133         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
134 };
135 */
136
137 #ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
138 #define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
139 #else
140 #define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
141 #endif
142
143 #define AIC79XX_CONFIGED_TAG_COMMANDS {                                 \
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         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
149         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
150         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
151         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE                \
152 }
153
154 /*
155  * By default, use the number of commands specified by
156  * the users kernel configuration.
157  */
158 static adapter_tag_info_t aic79xx_tag_info[] =
159 {
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         {AIC79XX_CONFIGED_TAG_COMMANDS},
173         {AIC79XX_CONFIGED_TAG_COMMANDS},
174         {AIC79XX_CONFIGED_TAG_COMMANDS},
175         {AIC79XX_CONFIGED_TAG_COMMANDS}
176 };
177
178 /*
179  * The I/O cell on the chip is very configurable in respect to its analog
180  * characteristics.  Set the defaults here; they can be overriden with
181  * the proper insmod parameters.
182  */
183 struct ahd_linux_iocell_opts
184 {
185         uint8_t precomp;
186         uint8_t slewrate;
187         uint8_t amplitude;
188 };
189 #define AIC79XX_DEFAULT_PRECOMP         0xFF
190 #define AIC79XX_DEFAULT_SLEWRATE        0xFF
191 #define AIC79XX_DEFAULT_AMPLITUDE       0xFF
192 #define AIC79XX_DEFAULT_IOOPTS                  \
193 {                                               \
194         AIC79XX_DEFAULT_PRECOMP,                \
195         AIC79XX_DEFAULT_SLEWRATE,               \
196         AIC79XX_DEFAULT_AMPLITUDE               \
197 }
198 #define AIC79XX_PRECOMP_INDEX   0
199 #define AIC79XX_SLEWRATE_INDEX  1
200 #define AIC79XX_AMPLITUDE_INDEX 2
201 static struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
202 {
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         AIC79XX_DEFAULT_IOOPTS,
216         AIC79XX_DEFAULT_IOOPTS,
217         AIC79XX_DEFAULT_IOOPTS,
218         AIC79XX_DEFAULT_IOOPTS
219 };
220
221 /*
222  * There should be a specific return value for this in scsi.h, but
223  * it seems that most drivers ignore it.
224  */
225 #define DID_UNDERFLOW   DID_ERROR
226
227 void
228 ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
229 {
230         printk("(scsi%d:%c:%d:%d): ",
231                ahd->platform_data->host->host_no,
232                scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
233                scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
234                scb != NULL ? SCB_GET_LUN(scb) : -1);
235 }
236
237 /*
238  * XXX - these options apply unilaterally to _all_ adapters
239  *       cards in the system.  This should be fixed.  Exceptions to this
240  *       rule are noted in the comments.
241  */
242
243 /*
244  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
245  * has no effect on any later resets that might occur due to things like
246  * SCSI bus timeouts.
247  */
248 static uint32_t aic79xx_no_reset;
249
250 /*
251  * Certain PCI motherboards will scan PCI devices from highest to lowest,
252  * others scan from lowest to highest, and they tend to do all kinds of
253  * strange things when they come into contact with PCI bridge chips.  The
254  * net result of all this is that the PCI card that is actually used to boot
255  * the machine is very hard to detect.  Most motherboards go from lowest
256  * PCI slot number to highest, and the first SCSI controller found is the
257  * one you boot from.  The only exceptions to this are when a controller
258  * has its BIOS disabled.  So, we by default sort all of our SCSI controllers
259  * from lowest PCI slot number to highest PCI slot number.  We also force
260  * all controllers with their BIOS disabled to the end of the list.  This
261  * works on *almost* all computers.  Where it doesn't work, we have this
262  * option.  Setting this option to non-0 will reverse the order of the sort
263  * to highest first, then lowest, but will still leave cards with their BIOS
264  * disabled at the very end.  That should fix everyone up unless there are
265  * really strange cirumstances.
266  */
267 static uint32_t aic79xx_reverse_scan;
268
269 /*
270  * Should we force EXTENDED translation on a controller.
271  *     0 == Use whatever is in the SEEPROM or default to off
272  *     1 == Use whatever is in the SEEPROM or default to on
273  */
274 static uint32_t aic79xx_extended;
275
276 /*
277  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
278  * dubious at best.  To my knowledge, this option has never actually
279  * solved a PCI parity problem, but on certain machines with broken PCI
280  * chipset configurations, it can generate tons of false error messages.
281  * It's included in the driver for completeness.
282  *   0     = Shut off PCI parity check
283  *   non-0 = Enable PCI parity check
284  *
285  * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
286  * variable to -1 you would actually want to simply pass the variable
287  * name without a number.  That will invert the 0 which will result in
288  * -1.
289  */
290 static uint32_t aic79xx_pci_parity = ~0;
291
292 /*
293  * There are lots of broken chipsets in the world.  Some of them will
294  * violate the PCI spec when we issue byte sized memory writes to our
295  * controller.  I/O mapped register access, if allowed by the given
296  * platform, will work in almost all cases.
297  */
298 uint32_t aic79xx_allow_memio = ~0;
299
300 /*
301  * So that we can set how long each device is given as a selection timeout.
302  * The table of values goes like this:
303  *   0 - 256ms
304  *   1 - 128ms
305  *   2 - 64ms
306  *   3 - 32ms
307  * We default to 256ms because some older devices need a longer time
308  * to respond to initial selection.
309  */
310 static uint32_t aic79xx_seltime;
311
312 /*
313  * Certain devices do not perform any aging on commands.  Should the
314  * device be saturated by commands in one portion of the disk, it is
315  * possible for transactions on far away sectors to never be serviced.
316  * To handle these devices, we can periodically send an ordered tag to
317  * force all outstanding transactions to be serviced prior to a new
318  * transaction.
319  */
320 uint32_t aic79xx_periodic_otag;
321
322 /*
323  * Module information and settable options.
324  */
325 static char *aic79xx = NULL;
326
327 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
328 MODULE_DESCRIPTION("Adaptec Aic790X U320 SCSI Host Bus Adapter driver");
329 MODULE_LICENSE("Dual BSD/GPL");
330 MODULE_VERSION(AIC79XX_DRIVER_VERSION);
331 module_param(aic79xx, charp, 0444);
332 MODULE_PARM_DESC(aic79xx,
333 "period delimited, options string.\n"
334 "       verbose                 Enable verbose/diagnostic logging\n"
335 "       allow_memio             Allow device registers to be memory mapped\n"
336 "       debug                   Bitmask of debug values to enable\n"
337 "       no_reset                Supress initial bus resets\n"
338 "       extended                Enable extended geometry on all controllers\n"
339 "       periodic_otag           Send an ordered tagged transaction\n"
340 "                               periodically to prevent tag starvation.\n"
341 "                               This may be required by some older disk\n"
342 "                               or drives/RAID arrays.\n"
343 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
344 "       tag_info:<tag_str>      Set per-target tag depth\n"
345 "       global_tag_depth:<int>  Global tag depth for all targets on all buses\n"
346 "       slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
347 "       precomp:<pcomp_list>    Set the signal precompensation (0-7).\n"
348 "       amplitude:<int>         Set the signal amplitude (0-7).\n"
349 "       seltime:<int>           Selection Timeout:\n"
350 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
351 "\n"
352 "       Sample /etc/modprobe.conf line:\n"
353 "               Enable verbose logging\n"
354 "               Set tag depth on Controller 2/Target 2 to 10 tags\n"
355 "               Shorten the selection timeout to 128ms\n"
356 "\n"
357 "       options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
358 "\n");
359
360 static void ahd_linux_handle_scsi_status(struct ahd_softc *,
361                                          struct scsi_device *,
362                                          struct scb *);
363 static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
364                                          struct scsi_cmnd *cmd);
365 static void ahd_linux_sem_timeout(u_long arg);
366 static int  ahd_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
367 static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
368 static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
369                                      struct ahd_devinfo *devinfo);
370 static void ahd_linux_device_queue_depth(struct scsi_device *);
371 static int ahd_linux_run_command(struct ahd_softc*,
372                                  struct ahd_linux_device *,
373                                  struct scsi_cmnd *);
374 static void ahd_linux_setup_tag_info_global(char *p);
375 static aic_option_callback_t ahd_linux_setup_tag_info;
376 static aic_option_callback_t ahd_linux_setup_iocell_info;
377 static int  aic79xx_setup(char *c);
378
379 static int ahd_linux_unit;
380
381
382 /****************************** Inlines ***************************************/
383 static __inline void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
384
385 static __inline void
386 ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
387 {
388         struct scsi_cmnd *cmd;
389         int direction;
390
391         cmd = scb->io_ctx;
392         direction = cmd->sc_data_direction;
393         ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
394         if (cmd->use_sg != 0) {
395                 struct scatterlist *sg;
396
397                 sg = (struct scatterlist *)cmd->request_buffer;
398                 pci_unmap_sg(ahd->dev_softc, sg, cmd->use_sg, direction);
399         } else if (cmd->request_bufflen != 0) {
400                 pci_unmap_single(ahd->dev_softc,
401                                  scb->platform_data->buf_busaddr,
402                                  cmd->request_bufflen, direction);
403         }
404 }
405
406 /******************************** Macros **************************************/
407 #define BUILD_SCSIID(ahd, cmd)                                          \
408         ((((cmd)->device->id << TID_SHIFT) & TID) | (ahd)->our_id)
409
410 /*
411  * Return a string describing the driver.
412  */
413 static const char *
414 ahd_linux_info(struct Scsi_Host *host)
415 {
416         static char buffer[512];
417         char    ahd_info[256];
418         char   *bp;
419         struct ahd_softc *ahd;
420
421         bp = &buffer[0];
422         ahd = *(struct ahd_softc **)host->hostdata;
423         memset(bp, 0, sizeof(buffer));
424         strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev ");
425         strcat(bp, AIC79XX_DRIVER_VERSION);
426         strcat(bp, "\n");
427         strcat(bp, "        <");
428         strcat(bp, ahd->description);
429         strcat(bp, ">\n");
430         strcat(bp, "        ");
431         ahd_controller_info(ahd, ahd_info);
432         strcat(bp, ahd_info);
433         strcat(bp, "\n");
434
435         return (bp);
436 }
437
438 /*
439  * Queue an SCB to the controller.
440  */
441 static int
442 ahd_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
443 {
444         struct   ahd_softc *ahd;
445         struct   ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
446
447         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
448
449         /*
450          * Close the race of a command that was in the process of
451          * being queued to us just as our simq was frozen.  Let
452          * DV commands through so long as we are only frozen to
453          * perform DV.
454          */
455         if (ahd->platform_data->qfrozen != 0) {
456                 printf("%s: queue frozen\n", ahd_name(ahd));
457
458                 return SCSI_MLQUEUE_HOST_BUSY;
459         }
460
461         /*
462          * Save the callback on completion function.
463          */
464         cmd->scsi_done = scsi_done;
465
466         cmd->result = CAM_REQ_INPROG << 16;
467
468         return ahd_linux_run_command(ahd, dev, cmd);
469 }
470
471 static inline struct scsi_target **
472 ahd_linux_target_in_softc(struct scsi_target *starget)
473 {
474         struct  ahd_softc *ahd =
475                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
476         unsigned int target_offset;
477
478         target_offset = starget->id;
479         if (starget->channel != 0)
480                 target_offset += 8;
481
482         return &ahd->platform_data->starget[target_offset];
483 }
484
485 static int
486 ahd_linux_target_alloc(struct scsi_target *starget)
487 {
488         struct  ahd_softc *ahd =
489                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
490         unsigned long flags;
491         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
492         struct ahd_linux_target *targ = scsi_transport_target_data(starget);
493         struct ahd_devinfo devinfo;
494         struct ahd_initiator_tinfo *tinfo;
495         struct ahd_tmode_tstate *tstate;
496         char channel = starget->channel + 'A';
497
498         ahd_lock(ahd, &flags);
499
500         BUG_ON(*ahd_targp != NULL);
501
502         *ahd_targp = starget;
503         memset(targ, 0, sizeof(*targ));
504
505         tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
506                                     starget->id, &tstate);
507         ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
508                             CAM_LUN_WILDCARD, channel,
509                             ROLE_INITIATOR);
510         spi_min_period(starget) = AHD_SYNCRATE_MAX; /* We can do U320 */
511         if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0)
512                 spi_max_offset(starget) = MAX_OFFSET_PACED_BUG;
513         else
514                 spi_max_offset(starget) = MAX_OFFSET_PACED;
515         spi_max_width(starget) = ahd->features & AHD_WIDE;
516
517         ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
518                          AHD_TRANS_GOAL, /*paused*/FALSE);
519         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
520                       AHD_TRANS_GOAL, /*paused*/FALSE);
521         ahd_unlock(ahd, &flags);
522
523         return 0;
524 }
525
526 static void
527 ahd_linux_target_destroy(struct scsi_target *starget)
528 {
529         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
530
531         *ahd_targp = NULL;
532 }
533
534 static int
535 ahd_linux_slave_alloc(struct scsi_device *sdev)
536 {
537         struct  ahd_softc *ahd =
538                 *((struct ahd_softc **)sdev->host->hostdata);
539         struct scsi_target *starget = sdev->sdev_target;
540         struct ahd_linux_target *targ = scsi_transport_target_data(starget);
541         struct ahd_linux_device *dev;
542
543         if (bootverbose)
544                 printf("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
545
546         BUG_ON(targ->sdev[sdev->lun] != NULL);
547
548         dev = scsi_transport_device_data(sdev);
549         memset(dev, 0, sizeof(*dev));
550
551         /*
552          * We start out life using untagged
553          * transactions of which we allow one.
554          */
555         dev->openings = 1;
556
557         /*
558          * Set maxtags to 0.  This will be changed if we
559          * later determine that we are dealing with
560          * a tagged queuing capable device.
561          */
562         dev->maxtags = 0;
563         
564         targ->sdev[sdev->lun] = sdev;
565
566         return (0);
567 }
568
569 static int
570 ahd_linux_slave_configure(struct scsi_device *sdev)
571 {
572         struct  ahd_softc *ahd;
573
574         ahd = *((struct ahd_softc **)sdev->host->hostdata);
575         if (bootverbose)
576                 printf("%s: Slave Configure %d\n", ahd_name(ahd), sdev->id);
577
578         ahd_linux_device_queue_depth(sdev);
579
580         /* Initial Domain Validation */
581         if (!spi_initial_dv(sdev->sdev_target))
582                 spi_dv_device(sdev);
583
584         return 0;
585 }
586
587 static void
588 ahd_linux_slave_destroy(struct scsi_device *sdev)
589 {
590         struct  ahd_softc *ahd;
591         struct  ahd_linux_device *dev = scsi_transport_device_data(sdev);
592         struct  ahd_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
593
594         ahd = *((struct ahd_softc **)sdev->host->hostdata);
595         if (bootverbose)
596                 printf("%s: Slave Destroy %d\n", ahd_name(ahd), sdev->id);
597
598         BUG_ON(dev->active);
599
600         targ->sdev[sdev->lun] = NULL;
601
602 }
603
604 #if defined(__i386__)
605 /*
606  * Return the disk geometry for the given SCSI device.
607  */
608 static int
609 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
610                     sector_t capacity, int geom[])
611 {
612         uint8_t *bh;
613         int      heads;
614         int      sectors;
615         int      cylinders;
616         int      ret;
617         int      extended;
618         struct   ahd_softc *ahd;
619
620         ahd = *((struct ahd_softc **)sdev->host->hostdata);
621
622         bh = scsi_bios_ptable(bdev);
623         if (bh) {
624                 ret = scsi_partsize(bh, capacity,
625                                     &geom[2], &geom[0], &geom[1]);
626                 kfree(bh);
627                 if (ret != -1)
628                         return (ret);
629         }
630         heads = 64;
631         sectors = 32;
632         cylinders = aic_sector_div(capacity, heads, sectors);
633
634         if (aic79xx_extended != 0)
635                 extended = 1;
636         else
637                 extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
638         if (extended && cylinders >= 1024) {
639                 heads = 255;
640                 sectors = 63;
641                 cylinders = aic_sector_div(capacity, heads, sectors);
642         }
643         geom[0] = heads;
644         geom[1] = sectors;
645         geom[2] = cylinders;
646         return (0);
647 }
648 #endif
649
650 /*
651  * Abort the current SCSI command(s).
652  */
653 static int
654 ahd_linux_abort(struct scsi_cmnd *cmd)
655 {
656         int error;
657
658         error = ahd_linux_queue_recovery_cmd(cmd, SCB_ABORT);
659         if (error != 0)
660                 printf("aic79xx_abort returns 0x%x\n", error);
661         return error;
662 }
663
664 /*
665  * Attempt to send a target reset message to the device that timed out.
666  */
667 static int
668 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
669 {
670         int error;
671
672         error = ahd_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
673         if (error != 0)
674                 printf("aic79xx_dev_reset returns 0x%x\n", error);
675         return error;
676 }
677
678 /*
679  * Reset the SCSI bus.
680  */
681 static int
682 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
683 {
684         struct ahd_softc *ahd;
685         u_long s;
686         int    found;
687
688         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
689 #ifdef AHD_DEBUG
690         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
691                 printf("%s: Bus reset called for cmd %p\n",
692                        ahd_name(ahd), cmd);
693 #endif
694         ahd_lock(ahd, &s);
695         found = ahd_reset_channel(ahd, cmd->device->channel + 'A',
696                                   /*initiate reset*/TRUE);
697         ahd_unlock(ahd, &s);
698
699         if (bootverbose)
700                 printf("%s: SCSI bus reset delivered. "
701                        "%d SCBs aborted.\n", ahd_name(ahd), found);
702
703         return (SUCCESS);
704 }
705
706 struct scsi_host_template aic79xx_driver_template = {
707         .module                 = THIS_MODULE,
708         .name                   = "aic79xx",
709         .proc_name              = "aic79xx",
710         .proc_info              = ahd_linux_proc_info,
711         .info                   = ahd_linux_info,
712         .queuecommand           = ahd_linux_queue,
713         .eh_abort_handler       = ahd_linux_abort,
714         .eh_device_reset_handler = ahd_linux_dev_reset,
715         .eh_bus_reset_handler   = ahd_linux_bus_reset,
716 #if defined(__i386__)
717         .bios_param             = ahd_linux_biosparam,
718 #endif
719         .can_queue              = AHD_MAX_QUEUE,
720         .this_id                = -1,
721         .cmd_per_lun            = 2,
722         .use_clustering         = ENABLE_CLUSTERING,
723         .slave_alloc            = ahd_linux_slave_alloc,
724         .slave_configure        = ahd_linux_slave_configure,
725         .slave_destroy          = ahd_linux_slave_destroy,
726         .target_alloc           = ahd_linux_target_alloc,
727         .target_destroy         = ahd_linux_target_destroy,
728 };
729
730 /******************************** Bus DMA *************************************/
731 int
732 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
733                    bus_size_t alignment, bus_size_t boundary,
734                    dma_addr_t lowaddr, dma_addr_t highaddr,
735                    bus_dma_filter_t *filter, void *filterarg,
736                    bus_size_t maxsize, int nsegments,
737                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
738 {
739         bus_dma_tag_t dmat;
740
741         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
742         if (dmat == NULL)
743                 return (ENOMEM);
744
745         /*
746          * Linux is very simplistic about DMA memory.  For now don't
747          * maintain all specification information.  Once Linux supplies
748          * better facilities for doing these operations, or the
749          * needs of this particular driver change, we might need to do
750          * more here.
751          */
752         dmat->alignment = alignment;
753         dmat->boundary = boundary;
754         dmat->maxsize = maxsize;
755         *ret_tag = dmat;
756         return (0);
757 }
758
759 void
760 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
761 {
762         free(dmat, M_DEVBUF);
763 }
764
765 int
766 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
767                  int flags, bus_dmamap_t *mapp)
768 {
769         *vaddr = pci_alloc_consistent(ahd->dev_softc,
770                                       dmat->maxsize, mapp);
771         if (*vaddr == NULL)
772                 return (ENOMEM);
773         return(0);
774 }
775
776 void
777 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
778                 void* vaddr, bus_dmamap_t map)
779 {
780         pci_free_consistent(ahd->dev_softc, dmat->maxsize,
781                             vaddr, map);
782 }
783
784 int
785 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
786                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
787                 void *cb_arg, int flags)
788 {
789         /*
790          * Assume for now that this will only be used during
791          * initialization and not for per-transaction buffer mapping.
792          */
793         bus_dma_segment_t stack_sg;
794
795         stack_sg.ds_addr = map;
796         stack_sg.ds_len = dmat->maxsize;
797         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
798         return (0);
799 }
800
801 void
802 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
803 {
804 }
805
806 int
807 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
808 {
809         /* Nothing to do */
810         return (0);
811 }
812
813 /********************* Platform Dependent Functions ***************************/
814 /*
815  * Compare "left hand" softc with "right hand" softc, returning:
816  * < 0 - lahd has a lower priority than rahd
817  *   0 - Softcs are equal
818  * > 0 - lahd has a higher priority than rahd
819  */
820 int
821 ahd_softc_comp(struct ahd_softc *lahd, struct ahd_softc *rahd)
822 {
823         int     value;
824
825         /*
826          * Under Linux, cards are ordered as follows:
827          *      1) PCI devices that are marked as the boot controller.
828          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
829          *      3) All remaining PCI devices sorted by bus/slot/func.
830          */
831 #if 0
832         value = (lahd->flags & AHD_BOOT_CHANNEL)
833               - (rahd->flags & AHD_BOOT_CHANNEL);
834         if (value != 0)
835                 /* Controllers set for boot have a *higher* priority */
836                 return (value);
837 #endif
838
839         value = (lahd->flags & AHD_BIOS_ENABLED)
840               - (rahd->flags & AHD_BIOS_ENABLED);
841         if (value != 0)
842                 /* Controllers with BIOS enabled have a *higher* priority */
843                 return (value);
844
845         /* Still equal.  Sort by bus/slot/func. */
846         if (aic79xx_reverse_scan != 0)
847                 value = ahd_get_pci_bus(lahd->dev_softc)
848                       - ahd_get_pci_bus(rahd->dev_softc);
849         else
850                 value = ahd_get_pci_bus(rahd->dev_softc)
851                       - ahd_get_pci_bus(lahd->dev_softc);
852         if (value != 0)
853                 return (value);
854         if (aic79xx_reverse_scan != 0)
855                 value = ahd_get_pci_slot(lahd->dev_softc)
856                       - ahd_get_pci_slot(rahd->dev_softc);
857         else
858                 value = ahd_get_pci_slot(rahd->dev_softc)
859                       - ahd_get_pci_slot(lahd->dev_softc);
860         if (value != 0)
861                 return (value);
862
863         value = rahd->channel - lahd->channel;
864         return (value);
865 }
866
867 static void
868 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
869 {
870
871         if ((instance >= 0)
872          && (instance < NUM_ELEMENTS(aic79xx_iocell_info))) {
873                 uint8_t *iocell_info;
874
875                 iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
876                 iocell_info[index] = value & 0xFFFF;
877                 if (bootverbose)
878                         printf("iocell[%d:%ld] = %d\n", instance, index, value);
879         }
880 }
881
882 static void
883 ahd_linux_setup_tag_info_global(char *p)
884 {
885         int tags, i, j;
886
887         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
888         printf("Setting Global Tags= %d\n", tags);
889
890         for (i = 0; i < NUM_ELEMENTS(aic79xx_tag_info); i++) {
891                 for (j = 0; j < AHD_NUM_TARGETS; j++) {
892                         aic79xx_tag_info[i].tag_commands[j] = tags;
893                 }
894         }
895 }
896
897 static void
898 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
899 {
900
901         if ((instance >= 0) && (targ >= 0)
902          && (instance < NUM_ELEMENTS(aic79xx_tag_info))
903          && (targ < AHD_NUM_TARGETS)) {
904                 aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
905                 if (bootverbose)
906                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
907         }
908 }
909
910 /*
911  * Handle Linux boot parameters. This routine allows for assigning a value
912  * to a parameter with a ':' between the parameter and the value.
913  * ie. aic79xx=stpwlev:1,extended
914  */
915 static int
916 aic79xx_setup(char *s)
917 {
918         int     i, n;
919         char   *p;
920         char   *end;
921
922         static struct {
923                 const char *name;
924                 uint32_t *flag;
925         } options[] = {
926                 { "extended", &aic79xx_extended },
927                 { "no_reset", &aic79xx_no_reset },
928                 { "verbose", &aic79xx_verbose },
929                 { "allow_memio", &aic79xx_allow_memio},
930 #ifdef AHD_DEBUG
931                 { "debug", &ahd_debug },
932 #endif
933                 { "reverse_scan", &aic79xx_reverse_scan },
934                 { "periodic_otag", &aic79xx_periodic_otag },
935                 { "pci_parity", &aic79xx_pci_parity },
936                 { "seltime", &aic79xx_seltime },
937                 { "tag_info", NULL },
938                 { "global_tag_depth", NULL},
939                 { "slewrate", NULL },
940                 { "precomp", NULL },
941                 { "amplitude", NULL },
942         };
943
944         end = strchr(s, '\0');
945
946         /*
947          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
948          * will never be 0 in this case.
949          */      
950         n = 0;  
951
952         while ((p = strsep(&s, ",.")) != NULL) {
953                 if (*p == '\0')
954                         continue;
955                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
956
957                         n = strlen(options[i].name);
958                         if (strncmp(options[i].name, p, n) == 0)
959                                 break;
960                 }
961                 if (i == NUM_ELEMENTS(options))
962                         continue;
963
964                 if (strncmp(p, "global_tag_depth", n) == 0) {
965                         ahd_linux_setup_tag_info_global(p + n);
966                 } else if (strncmp(p, "tag_info", n) == 0) {
967                         s = aic_parse_brace_option("tag_info", p + n, end,
968                             2, ahd_linux_setup_tag_info, 0);
969                 } else if (strncmp(p, "slewrate", n) == 0) {
970                         s = aic_parse_brace_option("slewrate",
971                             p + n, end, 1, ahd_linux_setup_iocell_info,
972                             AIC79XX_SLEWRATE_INDEX);
973                 } else if (strncmp(p, "precomp", n) == 0) {
974                         s = aic_parse_brace_option("precomp",
975                             p + n, end, 1, ahd_linux_setup_iocell_info,
976                             AIC79XX_PRECOMP_INDEX);
977                 } else if (strncmp(p, "amplitude", n) == 0) {
978                         s = aic_parse_brace_option("amplitude",
979                             p + n, end, 1, ahd_linux_setup_iocell_info,
980                             AIC79XX_AMPLITUDE_INDEX);
981                 } else if (p[n] == ':') {
982                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
983                 } else if (!strncmp(p, "verbose", n)) {
984                         *(options[i].flag) = 1;
985                 } else {
986                         *(options[i].flag) ^= 0xFFFFFFFF;
987                 }
988         }
989         return 1;
990 }
991
992 __setup("aic79xx=", aic79xx_setup);
993
994 uint32_t aic79xx_verbose;
995
996 int
997 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
998 {
999         char    buf[80];
1000         struct  Scsi_Host *host;
1001         char    *new_name;
1002         u_long  s;
1003
1004         template->name = ahd->description;
1005         host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1006         if (host == NULL)
1007                 return (ENOMEM);
1008
1009         *((struct ahd_softc **)host->hostdata) = ahd;
1010         ahd_lock(ahd, &s);
1011         scsi_assign_lock(host, &ahd->platform_data->spin_lock);
1012         ahd->platform_data->host = host;
1013         host->can_queue = AHD_MAX_QUEUE;
1014         host->cmd_per_lun = 2;
1015         host->sg_tablesize = AHD_NSEG;
1016         host->this_id = ahd->our_id;
1017         host->irq = ahd->platform_data->irq;
1018         host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1019         host->max_lun = AHD_NUM_LUNS;
1020         host->max_channel = 0;
1021         host->sg_tablesize = AHD_NSEG;
1022         ahd_set_unit(ahd, ahd_linux_unit++);
1023         sprintf(buf, "scsi%d", host->host_no);
1024         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1025         if (new_name != NULL) {
1026                 strcpy(new_name, buf);
1027                 ahd_set_name(ahd, new_name);
1028         }
1029         host->unique_id = ahd->unit;
1030         ahd_linux_initialize_scsi_bus(ahd);
1031         ahd_intr_enable(ahd, TRUE);
1032         ahd_unlock(ahd, &s);
1033
1034         host->transportt = ahd_linux_transport_template;
1035
1036         scsi_add_host(host, &ahd->dev_softc->dev); /* XXX handle failure */
1037         scsi_scan_host(host);
1038         return (0);
1039 }
1040
1041 uint64_t
1042 ahd_linux_get_memsize(void)
1043 {
1044         struct sysinfo si;
1045
1046         si_meminfo(&si);
1047         return ((uint64_t)si.totalram << PAGE_SHIFT);
1048 }
1049
1050 /*
1051  * Place the SCSI bus into a known state by either resetting it,
1052  * or forcing transfer negotiations on the next command to any
1053  * target.
1054  */
1055 static void
1056 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1057 {
1058         u_int target_id;
1059         u_int numtarg;
1060
1061         target_id = 0;
1062         numtarg = 0;
1063
1064         if (aic79xx_no_reset != 0)
1065                 ahd->flags &= ~AHD_RESET_BUS_A;
1066
1067         if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1068                 ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1069         else
1070                 numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1071
1072         /*
1073          * Force negotiation to async for all targets that
1074          * will not see an initial bus reset.
1075          */
1076         for (; target_id < numtarg; target_id++) {
1077                 struct ahd_devinfo devinfo;
1078                 struct ahd_initiator_tinfo *tinfo;
1079                 struct ahd_tmode_tstate *tstate;
1080
1081                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1082                                             target_id, &tstate);
1083                 ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1084                                     CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1085                 ahd_update_neg_request(ahd, &devinfo, tstate,
1086                                        tinfo, AHD_NEG_ALWAYS);
1087         }
1088         /* Give the bus some time to recover */
1089         if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1090                 ahd_freeze_simq(ahd);
1091                 init_timer(&ahd->platform_data->reset_timer);
1092                 ahd->platform_data->reset_timer.data = (u_long)ahd;
1093                 ahd->platform_data->reset_timer.expires =
1094                     jiffies + (AIC79XX_RESET_DELAY * HZ)/1000;
1095                 ahd->platform_data->reset_timer.function =
1096                     (ahd_linux_callback_t *)ahd_release_simq;
1097                 add_timer(&ahd->platform_data->reset_timer);
1098         }
1099 }
1100
1101 int
1102 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1103 {
1104         ahd->platform_data =
1105             malloc(sizeof(struct ahd_platform_data), M_DEVBUF, M_NOWAIT);
1106         if (ahd->platform_data == NULL)
1107                 return (ENOMEM);
1108         memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
1109         ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1110         ahd_lockinit(ahd);
1111         init_MUTEX_LOCKED(&ahd->platform_data->eh_sem);
1112         ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1113         return (0);
1114 }
1115
1116 void
1117 ahd_platform_free(struct ahd_softc *ahd)
1118 {
1119         struct scsi_target *starget;
1120         int i, j;
1121
1122         if (ahd->platform_data != NULL) {
1123                 if (ahd->platform_data->host != NULL) {
1124                         scsi_remove_host(ahd->platform_data->host);
1125                         scsi_host_put(ahd->platform_data->host);
1126                 }
1127
1128                 /* destroy all of the device and target objects */
1129                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
1130                         starget = ahd->platform_data->starget[i];
1131                         if (starget != NULL) {
1132                                 for (j = 0; j < AHD_NUM_LUNS; j++) {
1133                                         struct ahd_linux_target *targ =
1134                                                 scsi_transport_target_data(starget);
1135                                         if (targ->sdev[j] == NULL)
1136                                                 continue;
1137                                         targ->sdev[j] = NULL;
1138                                 }
1139                                 ahd->platform_data->starget[i] = NULL;
1140                         }
1141                 }
1142
1143                 if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1144                         free_irq(ahd->platform_data->irq, ahd);
1145                 if (ahd->tags[0] == BUS_SPACE_PIO
1146                  && ahd->bshs[0].ioport != 0)
1147                         release_region(ahd->bshs[0].ioport, 256);
1148                 if (ahd->tags[1] == BUS_SPACE_PIO
1149                  && ahd->bshs[1].ioport != 0)
1150                         release_region(ahd->bshs[1].ioport, 256);
1151                 if (ahd->tags[0] == BUS_SPACE_MEMIO
1152                  && ahd->bshs[0].maddr != NULL) {
1153                         iounmap(ahd->bshs[0].maddr);
1154                         release_mem_region(ahd->platform_data->mem_busaddr,
1155                                            0x1000);
1156                 }
1157                 free(ahd->platform_data, M_DEVBUF);
1158         }
1159 }
1160
1161 void
1162 ahd_platform_init(struct ahd_softc *ahd)
1163 {
1164         /*
1165          * Lookup and commit any modified IO Cell options.
1166          */
1167         if (ahd->unit < NUM_ELEMENTS(aic79xx_iocell_info)) {
1168                 struct ahd_linux_iocell_opts *iocell_opts;
1169
1170                 iocell_opts = &aic79xx_iocell_info[ahd->unit];
1171                 if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1172                         AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1173                 if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1174                         AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1175                 if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1176                         AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1177         }
1178
1179 }
1180
1181 void
1182 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1183 {
1184         ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1185                                 SCB_GET_CHANNEL(ahd, scb),
1186                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1187                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1188 }
1189
1190 void
1191 ahd_platform_set_tags(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
1192                       ahd_queue_alg alg)
1193 {
1194         struct scsi_target *starget;
1195         struct ahd_linux_target *targ;
1196         struct ahd_linux_device *dev;
1197         struct scsi_device *sdev;
1198         int was_queuing;
1199         int now_queuing;
1200
1201         starget = ahd->platform_data->starget[devinfo->target];
1202         targ = scsi_transport_target_data(starget);
1203         BUG_ON(targ == NULL);
1204         sdev = targ->sdev[devinfo->lun];
1205         if (sdev == NULL)
1206                 return;
1207
1208         dev = scsi_transport_device_data(sdev);
1209
1210         if (dev == NULL)
1211                 return;
1212         was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1213         switch (alg) {
1214         default:
1215         case AHD_QUEUE_NONE:
1216                 now_queuing = 0;
1217                 break; 
1218         case AHD_QUEUE_BASIC:
1219                 now_queuing = AHD_DEV_Q_BASIC;
1220                 break;
1221         case AHD_QUEUE_TAGGED:
1222                 now_queuing = AHD_DEV_Q_TAGGED;
1223                 break;
1224         }
1225         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1226          && (was_queuing != now_queuing)
1227          && (dev->active != 0)) {
1228                 dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1229                 dev->qfrozen++;
1230         }
1231
1232         dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1233         if (now_queuing) {
1234                 u_int usertags;
1235
1236                 usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1237                 if (!was_queuing) {
1238                         /*
1239                          * Start out agressively and allow our
1240                          * dynamic queue depth algorithm to take
1241                          * care of the rest.
1242                          */
1243                         dev->maxtags = usertags;
1244                         dev->openings = dev->maxtags - dev->active;
1245                 }
1246                 if (dev->maxtags == 0) {
1247                         /*
1248                          * Queueing is disabled by the user.
1249                          */
1250                         dev->openings = 1;
1251                 } else if (alg == AHD_QUEUE_TAGGED) {
1252                         dev->flags |= AHD_DEV_Q_TAGGED;
1253                         if (aic79xx_periodic_otag != 0)
1254                                 dev->flags |= AHD_DEV_PERIODIC_OTAG;
1255                 } else
1256                         dev->flags |= AHD_DEV_Q_BASIC;
1257         } else {
1258                 /* We can only have one opening. */
1259                 dev->maxtags = 0;
1260                 dev->openings =  1 - dev->active;
1261         }
1262
1263         switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1264         case AHD_DEV_Q_BASIC:
1265                 scsi_adjust_queue_depth(sdev,
1266                                         MSG_SIMPLE_TASK,
1267                                         dev->openings + dev->active);
1268                 break;
1269         case AHD_DEV_Q_TAGGED:
1270                 scsi_adjust_queue_depth(sdev,
1271                                         MSG_ORDERED_TASK,
1272                                         dev->openings + dev->active);
1273                 break;
1274         default:
1275                 /*
1276                  * We allow the OS to queue 2 untagged transactions to
1277                  * us at any time even though we can only execute them
1278                  * serially on the controller/device.  This should
1279                  * remove some latency.
1280                  */
1281                 scsi_adjust_queue_depth(sdev,
1282                                         /*NON-TAGGED*/0,
1283                                         /*queue depth*/2);
1284                 break;
1285         }
1286 }
1287
1288 int
1289 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1290                         int lun, u_int tag, role_t role, uint32_t status)
1291 {
1292         return 0;
1293 }
1294
1295 static u_int
1296 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1297 {
1298         static int warned_user;
1299         u_int tags;
1300
1301         tags = 0;
1302         if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1303                 if (ahd->unit >= NUM_ELEMENTS(aic79xx_tag_info)) {
1304
1305                         if (warned_user == 0) {
1306                                 printf(KERN_WARNING
1307 "aic79xx: WARNING: Insufficient tag_info instances\n"
1308 "aic79xx: for installed controllers.  Using defaults\n"
1309 "aic79xx: Please update the aic79xx_tag_info array in\n"
1310 "aic79xx: the aic79xx_osm.c source file.\n");
1311                                 warned_user++;
1312                         }
1313                         tags = AHD_MAX_QUEUE;
1314                 } else {
1315                         adapter_tag_info_t *tag_info;
1316
1317                         tag_info = &aic79xx_tag_info[ahd->unit];
1318                         tags = tag_info->tag_commands[devinfo->target_offset];
1319                         if (tags > AHD_MAX_QUEUE)
1320                                 tags = AHD_MAX_QUEUE;
1321                 }
1322         }
1323         return (tags);
1324 }
1325
1326 /*
1327  * Determines the queue depth for a given device.
1328  */
1329 static void
1330 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1331 {
1332         struct  ahd_devinfo devinfo;
1333         u_int   tags;
1334         struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1335
1336         ahd_compile_devinfo(&devinfo,
1337                             ahd->our_id,
1338                             sdev->sdev_target->id, sdev->lun,
1339                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1340                             ROLE_INITIATOR);
1341         tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1342         if (tags != 0 && sdev->tagged_supported != 0) {
1343
1344                 ahd_set_tags(ahd, &devinfo, AHD_QUEUE_TAGGED);
1345                 ahd_print_devinfo(ahd, &devinfo);
1346                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1347         } else {
1348                 ahd_set_tags(ahd, &devinfo, AHD_QUEUE_NONE);
1349         }
1350 }
1351
1352 static int
1353 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1354                       struct scsi_cmnd *cmd)
1355 {
1356         struct   scb *scb;
1357         struct   hardware_scb *hscb;
1358         struct   ahd_initiator_tinfo *tinfo;
1359         struct   ahd_tmode_tstate *tstate;
1360         u_int    col_idx;
1361         uint16_t mask;
1362
1363         /*
1364          * Get an scb to use.
1365          */
1366         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1367                                     cmd->device->id, &tstate);
1368         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1369          || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1370                 col_idx = AHD_NEVER_COL_IDX;
1371         } else {
1372                 col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1373                                             cmd->device->lun);
1374         }
1375         if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1376                 ahd->flags |= AHD_RESOURCE_SHORTAGE;
1377                 return SCSI_MLQUEUE_HOST_BUSY;
1378         }
1379
1380         scb->io_ctx = cmd;
1381         scb->platform_data->dev = dev;
1382         hscb = scb->hscb;
1383         cmd->host_scribble = (char *)scb;
1384
1385         /*
1386          * Fill out basics of the HSCB.
1387          */
1388         hscb->control = 0;
1389         hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1390         hscb->lun = cmd->device->lun;
1391         scb->hscb->task_management = 0;
1392         mask = SCB_GET_TARGET_MASK(ahd, scb);
1393
1394         if ((ahd->user_discenable & mask) != 0)
1395                 hscb->control |= DISCENB;
1396
1397         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1398                 scb->flags |= SCB_PACKETIZED;
1399
1400         if ((tstate->auto_negotiate & mask) != 0) {
1401                 scb->flags |= SCB_AUTO_NEGOTIATE;
1402                 scb->hscb->control |= MK_MESSAGE;
1403         }
1404
1405         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1406                 int     msg_bytes;
1407                 uint8_t tag_msgs[2];
1408
1409                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1410                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1411                         hscb->control |= tag_msgs[0];
1412                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1413                                 dev->commands_since_idle_or_otag = 0;
1414                 } else
1415                 if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1416                  && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1417                         hscb->control |= MSG_ORDERED_TASK;
1418                         dev->commands_since_idle_or_otag = 0;
1419                 } else {
1420                         hscb->control |= MSG_SIMPLE_TASK;
1421                 }
1422         }
1423
1424         hscb->cdb_len = cmd->cmd_len;
1425         memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1426
1427         scb->platform_data->xfer_len = 0;
1428         ahd_set_residual(scb, 0);
1429         ahd_set_sense_residual(scb, 0);
1430         scb->sg_count = 0;
1431         if (cmd->use_sg != 0) {
1432                 void    *sg;
1433                 struct   scatterlist *cur_seg;
1434                 u_int    nseg;
1435                 int      dir;
1436
1437                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1438                 dir = cmd->sc_data_direction;
1439                 nseg = pci_map_sg(ahd->dev_softc, cur_seg,
1440                                   cmd->use_sg, dir);
1441                 scb->platform_data->xfer_len = 0;
1442                 for (sg = scb->sg_list; nseg > 0; nseg--, cur_seg++) {
1443                         dma_addr_t addr;
1444                         bus_size_t len;
1445
1446                         addr = sg_dma_address(cur_seg);
1447                         len = sg_dma_len(cur_seg);
1448                         scb->platform_data->xfer_len += len;
1449                         sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1450                                           /*last*/nseg == 1);
1451                 }
1452         } else if (cmd->request_bufflen != 0) {
1453                 void *sg;
1454                 dma_addr_t addr;
1455                 int dir;
1456
1457                 sg = scb->sg_list;
1458                 dir = cmd->sc_data_direction;
1459                 addr = pci_map_single(ahd->dev_softc,
1460                                       cmd->request_buffer,
1461                                       cmd->request_bufflen, dir);
1462                 scb->platform_data->xfer_len = cmd->request_bufflen;
1463                 scb->platform_data->buf_busaddr = addr;
1464                 sg = ahd_sg_setup(ahd, scb, sg, addr,
1465                                   cmd->request_bufflen, /*last*/TRUE);
1466         }
1467
1468         LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1469         dev->openings--;
1470         dev->active++;
1471         dev->commands_issued++;
1472
1473         if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1474                 dev->commands_since_idle_or_otag++;
1475         scb->flags |= SCB_ACTIVE;
1476         ahd_queue_scb(ahd, scb);
1477
1478         return 0;
1479 }
1480
1481 /*
1482  * SCSI controller interrupt handler.
1483  */
1484 irqreturn_t
1485 ahd_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1486 {
1487         struct  ahd_softc *ahd;
1488         u_long  flags;
1489         int     ours;
1490
1491         ahd = (struct ahd_softc *) dev_id;
1492         ahd_lock(ahd, &flags); 
1493         ours = ahd_intr(ahd);
1494         ahd_unlock(ahd, &flags);
1495         return IRQ_RETVAL(ours);
1496 }
1497
1498 void
1499 ahd_platform_flushwork(struct ahd_softc *ahd)
1500 {
1501
1502 }
1503
1504 void
1505 ahd_send_async(struct ahd_softc *ahd, char channel,
1506                u_int target, u_int lun, ac_code code, void *arg)
1507 {
1508         switch (code) {
1509         case AC_TRANSFER_NEG:
1510         {
1511                 char    buf[80];
1512                 struct  scsi_target *starget;
1513                 struct  ahd_linux_target *targ;
1514                 struct  info_str info;
1515                 struct  ahd_initiator_tinfo *tinfo;
1516                 struct  ahd_tmode_tstate *tstate;
1517                 unsigned int target_ppr_options;
1518
1519                 BUG_ON(target == CAM_TARGET_WILDCARD);
1520
1521                 info.buffer = buf;
1522                 info.length = sizeof(buf);
1523                 info.offset = 0;
1524                 info.pos = 0;
1525                 tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1526                                             target, &tstate);
1527
1528                 /*
1529                  * Don't bother reporting results while
1530                  * negotiations are still pending.
1531                  */
1532                 if (tinfo->curr.period != tinfo->goal.period
1533                  || tinfo->curr.width != tinfo->goal.width
1534                  || tinfo->curr.offset != tinfo->goal.offset
1535                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1536                         if (bootverbose == 0)
1537                                 break;
1538
1539                 /*
1540                  * Don't bother reporting results that
1541                  * are identical to those last reported.
1542                  */
1543                 starget = ahd->platform_data->starget[target];
1544                 if (starget == NULL)
1545                         break;
1546                 targ = scsi_transport_target_data(starget);
1547
1548                 target_ppr_options =
1549                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1550                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1551                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1552                         + (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1553                         + (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1554                         + (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1555                         + (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1556                         + (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1557
1558                 if (tinfo->curr.period == spi_period(starget)
1559                     && tinfo->curr.width == spi_width(starget)
1560                     && tinfo->curr.offset == spi_offset(starget)
1561                  && tinfo->curr.ppr_options == target_ppr_options)
1562                         if (bootverbose == 0)
1563                                 break;
1564
1565                 spi_period(starget) = tinfo->curr.period;
1566                 spi_width(starget) = tinfo->curr.width;
1567                 spi_offset(starget) = tinfo->curr.offset;
1568                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1569                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1570                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1571                 spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1572                 spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1573                 spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1574                 spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1575                 spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1576                 spi_display_xfer_agreement(starget);
1577                 break;
1578         }
1579         case AC_SENT_BDR:
1580         {
1581                 WARN_ON(lun != CAM_LUN_WILDCARD);
1582                 scsi_report_device_reset(ahd->platform_data->host,
1583                                          channel - 'A', target);
1584                 break;
1585         }
1586         case AC_BUS_RESET:
1587                 if (ahd->platform_data->host != NULL) {
1588                         scsi_report_bus_reset(ahd->platform_data->host,
1589                                               channel - 'A');
1590                 }
1591                 break;
1592         default:
1593                 panic("ahd_send_async: Unexpected async event");
1594         }
1595 }
1596
1597 /*
1598  * Calls the higher level scsi done function and frees the scb.
1599  */
1600 void
1601 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1602 {
1603         struct scsi_cmnd *cmd;
1604         struct    ahd_linux_device *dev;
1605
1606         if ((scb->flags & SCB_ACTIVE) == 0) {
1607                 printf("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1608                 ahd_dump_card_state(ahd);
1609                 panic("Stopping for safety");
1610         }
1611         LIST_REMOVE(scb, pending_links);
1612         cmd = scb->io_ctx;
1613         dev = scb->platform_data->dev;
1614         dev->active--;
1615         dev->openings++;
1616         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1617                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1618                 dev->qfrozen--;
1619         }
1620         ahd_linux_unmap_scb(ahd, scb);
1621
1622         /*
1623          * Guard against stale sense data.
1624          * The Linux mid-layer assumes that sense
1625          * was retrieved anytime the first byte of
1626          * the sense buffer looks "sane".
1627          */
1628         cmd->sense_buffer[0] = 0;
1629         if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1630                 uint32_t amount_xferred;
1631
1632                 amount_xferred =
1633                     ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1634                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1635 #ifdef AHD_DEBUG
1636                         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1637                                 ahd_print_path(ahd, scb);
1638                                 printf("Set CAM_UNCOR_PARITY\n");
1639                         }
1640 #endif
1641                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1642 #ifdef AHD_REPORT_UNDERFLOWS
1643                 /*
1644                  * This code is disabled by default as some
1645                  * clients of the SCSI system do not properly
1646                  * initialize the underflow parameter.  This
1647                  * results in spurious termination of commands
1648                  * that complete as expected (e.g. underflow is
1649                  * allowed as command can return variable amounts
1650                  * of data.
1651                  */
1652                 } else if (amount_xferred < scb->io_ctx->underflow) {
1653                         u_int i;
1654
1655                         ahd_print_path(ahd, scb);
1656                         printf("CDB:");
1657                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1658                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1659                         printf("\n");
1660                         ahd_print_path(ahd, scb);
1661                         printf("Saw underflow (%ld of %ld bytes). "
1662                                "Treated as error\n",
1663                                 ahd_get_residual(scb),
1664                                 ahd_get_transfer_length(scb));
1665                         ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1666 #endif
1667                 } else {
1668                         ahd_set_transaction_status(scb, CAM_REQ_CMP);
1669                 }
1670         } else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1671                 ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1672         }
1673
1674         if (dev->openings == 1
1675          && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1676          && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1677                 dev->tag_success_count++;
1678         /*
1679          * Some devices deal with temporary internal resource
1680          * shortages by returning queue full.  When the queue
1681          * full occurrs, we throttle back.  Slowly try to get
1682          * back to our previous queue depth.
1683          */
1684         if ((dev->openings + dev->active) < dev->maxtags
1685          && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1686                 dev->tag_success_count = 0;
1687                 dev->openings++;
1688         }
1689
1690         if (dev->active == 0)
1691                 dev->commands_since_idle_or_otag = 0;
1692
1693         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1694                 printf("Recovery SCB completes\n");
1695                 if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1696                  || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1697                         ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1698                 if ((ahd->platform_data->flags & AHD_SCB_UP_EH_SEM) != 0) {
1699                         ahd->platform_data->flags &= ~AHD_SCB_UP_EH_SEM;
1700                         up(&ahd->platform_data->eh_sem);
1701                 }
1702         }
1703
1704         ahd_free_scb(ahd, scb);
1705         ahd_linux_queue_cmd_complete(ahd, cmd);
1706 }
1707
1708 static void
1709 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1710                              struct scsi_device *sdev, struct scb *scb)
1711 {
1712         struct  ahd_devinfo devinfo;
1713         struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1714
1715         ahd_compile_devinfo(&devinfo,
1716                             ahd->our_id,
1717                             sdev->sdev_target->id, sdev->lun,
1718                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1719                             ROLE_INITIATOR);
1720         
1721         /*
1722          * We don't currently trust the mid-layer to
1723          * properly deal with queue full or busy.  So,
1724          * when one occurs, we tell the mid-layer to
1725          * unconditionally requeue the command to us
1726          * so that we can retry it ourselves.  We also
1727          * implement our own throttling mechanism so
1728          * we don't clobber the device with too many
1729          * commands.
1730          */
1731         switch (ahd_get_scsi_status(scb)) {
1732         default:
1733                 break;
1734         case SCSI_STATUS_CHECK_COND:
1735         case SCSI_STATUS_CMD_TERMINATED:
1736         {
1737                 struct scsi_cmnd *cmd;
1738
1739                 /*
1740                  * Copy sense information to the OS's cmd
1741                  * structure if it is available.
1742                  */
1743                 cmd = scb->io_ctx;
1744                 if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1745                         struct scsi_status_iu_header *siu;
1746                         u_int sense_size;
1747                         u_int sense_offset;
1748
1749                         if (scb->flags & SCB_SENSE) {
1750                                 sense_size = MIN(sizeof(struct scsi_sense_data)
1751                                                - ahd_get_sense_residual(scb),
1752                                                  sizeof(cmd->sense_buffer));
1753                                 sense_offset = 0;
1754                         } else {
1755                                 /*
1756                                  * Copy only the sense data into the provided
1757                                  * buffer.
1758                                  */
1759                                 siu = (struct scsi_status_iu_header *)
1760                                     scb->sense_data;
1761                                 sense_size = MIN(scsi_4btoul(siu->sense_length),
1762                                                 sizeof(cmd->sense_buffer));
1763                                 sense_offset = SIU_SENSE_OFFSET(siu);
1764                         }
1765
1766                         memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
1767                         memcpy(cmd->sense_buffer,
1768                                ahd_get_sense_buf(ahd, scb)
1769                                + sense_offset, sense_size);
1770                         cmd->result |= (DRIVER_SENSE << 24);
1771
1772 #ifdef AHD_DEBUG
1773                         if (ahd_debug & AHD_SHOW_SENSE) {
1774                                 int i;
1775
1776                                 printf("Copied %d bytes of sense data at %d:",
1777                                        sense_size, sense_offset);
1778                                 for (i = 0; i < sense_size; i++) {
1779                                         if ((i & 0xF) == 0)
1780                                                 printf("\n");
1781                                         printf("0x%x ", cmd->sense_buffer[i]);
1782                                 }
1783                                 printf("\n");
1784                         }
1785 #endif
1786                 }
1787                 break;
1788         }
1789         case SCSI_STATUS_QUEUE_FULL:
1790                 /*
1791                  * By the time the core driver has returned this
1792                  * command, all other commands that were queued
1793                  * to us but not the device have been returned.
1794                  * This ensures that dev->active is equal to
1795                  * the number of commands actually queued to
1796                  * the device.
1797                  */
1798                 dev->tag_success_count = 0;
1799                 if (dev->active != 0) {
1800                         /*
1801                          * Drop our opening count to the number
1802                          * of commands currently outstanding.
1803                          */
1804                         dev->openings = 0;
1805 #ifdef AHD_DEBUG
1806                         if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1807                                 ahd_print_path(ahd, scb);
1808                                 printf("Dropping tag count to %d\n",
1809                                        dev->active);
1810                         }
1811 #endif
1812                         if (dev->active == dev->tags_on_last_queuefull) {
1813
1814                                 dev->last_queuefull_same_count++;
1815                                 /*
1816                                  * If we repeatedly see a queue full
1817                                  * at the same queue depth, this
1818                                  * device has a fixed number of tag
1819                                  * slots.  Lock in this tag depth
1820                                  * so we stop seeing queue fulls from
1821                                  * this device.
1822                                  */
1823                                 if (dev->last_queuefull_same_count
1824                                  == AHD_LOCK_TAGS_COUNT) {
1825                                         dev->maxtags = dev->active;
1826                                         ahd_print_path(ahd, scb);
1827                                         printf("Locking max tag count at %d\n",
1828                                                dev->active);
1829                                 }
1830                         } else {
1831                                 dev->tags_on_last_queuefull = dev->active;
1832                                 dev->last_queuefull_same_count = 0;
1833                         }
1834                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
1835                         ahd_set_scsi_status(scb, SCSI_STATUS_OK);
1836                         ahd_platform_set_tags(ahd, &devinfo,
1837                                      (dev->flags & AHD_DEV_Q_BASIC)
1838                                    ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1839                         break;
1840                 }
1841                 /*
1842                  * Drop down to a single opening, and treat this
1843                  * as if the target returned BUSY SCSI status.
1844                  */
1845                 dev->openings = 1;
1846                 ahd_platform_set_tags(ahd, &devinfo,
1847                              (dev->flags & AHD_DEV_Q_BASIC)
1848                            ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1849                 ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
1850         }
1851 }
1852
1853 static void
1854 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
1855 {
1856         /*
1857          * Map CAM error codes into Linux Error codes.  We
1858          * avoid the conversion so that the DV code has the
1859          * full error information available when making
1860          * state change decisions.
1861          */
1862         {
1863                 uint32_t status;
1864                 u_int new_status;
1865
1866                 status = ahd_cmd_get_transaction_status(cmd);
1867                 switch (status) {
1868                 case CAM_REQ_INPROG:
1869                 case CAM_REQ_CMP:
1870                 case CAM_SCSI_STATUS_ERROR:
1871                         new_status = DID_OK;
1872                         break;
1873                 case CAM_REQ_ABORTED:
1874                         new_status = DID_ABORT;
1875                         break;
1876                 case CAM_BUSY:
1877                         new_status = DID_BUS_BUSY;
1878                         break;
1879                 case CAM_REQ_INVALID:
1880                 case CAM_PATH_INVALID:
1881                         new_status = DID_BAD_TARGET;
1882                         break;
1883                 case CAM_SEL_TIMEOUT:
1884                         new_status = DID_NO_CONNECT;
1885                         break;
1886                 case CAM_SCSI_BUS_RESET:
1887                 case CAM_BDR_SENT:
1888                         new_status = DID_RESET;
1889                         break;
1890                 case CAM_UNCOR_PARITY:
1891                         new_status = DID_PARITY;
1892                         break;
1893                 case CAM_CMD_TIMEOUT:
1894                         new_status = DID_TIME_OUT;
1895                         break;
1896                 case CAM_UA_ABORT:
1897                 case CAM_REQ_CMP_ERR:
1898                 case CAM_AUTOSENSE_FAIL:
1899                 case CAM_NO_HBA:
1900                 case CAM_DATA_RUN_ERR:
1901                 case CAM_UNEXP_BUSFREE:
1902                 case CAM_SEQUENCE_FAIL:
1903                 case CAM_CCB_LEN_ERR:
1904                 case CAM_PROVIDE_FAIL:
1905                 case CAM_REQ_TERMIO:
1906                 case CAM_UNREC_HBA_ERROR:
1907                 case CAM_REQ_TOO_BIG:
1908                         new_status = DID_ERROR;
1909                         break;
1910                 case CAM_REQUEUE_REQ:
1911                         new_status = DID_REQUEUE;
1912                         break;
1913                 default:
1914                         /* We should never get here */
1915                         new_status = DID_ERROR;
1916                         break;
1917                 }
1918
1919                 ahd_cmd_set_transaction_status(cmd, new_status);
1920         }
1921
1922         cmd->scsi_done(cmd);
1923 }
1924
1925 static void
1926 ahd_linux_sem_timeout(u_long arg)
1927 {
1928         struct  ahd_softc *ahd;
1929         u_long  s;
1930
1931         ahd = (struct ahd_softc *)arg;
1932
1933         ahd_lock(ahd, &s);
1934         if ((ahd->platform_data->flags & AHD_SCB_UP_EH_SEM) != 0) {
1935                 ahd->platform_data->flags &= ~AHD_SCB_UP_EH_SEM;
1936                 up(&ahd->platform_data->eh_sem);
1937         }
1938         ahd_unlock(ahd, &s);
1939 }
1940
1941 void
1942 ahd_freeze_simq(struct ahd_softc *ahd)
1943 {
1944         ahd->platform_data->qfrozen++;
1945         if (ahd->platform_data->qfrozen == 1) {
1946                 scsi_block_requests(ahd->platform_data->host);
1947                 ahd_platform_abort_scbs(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
1948                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
1949                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
1950         }
1951 }
1952
1953 void
1954 ahd_release_simq(struct ahd_softc *ahd)
1955 {
1956         u_long s;
1957         int    unblock_reqs;
1958
1959         unblock_reqs = 0;
1960         ahd_lock(ahd, &s);
1961         if (ahd->platform_data->qfrozen > 0)
1962                 ahd->platform_data->qfrozen--;
1963         if (ahd->platform_data->qfrozen == 0) {
1964                 unblock_reqs = 1;
1965         }
1966         ahd_unlock(ahd, &s);
1967         /*
1968          * There is still a race here.  The mid-layer
1969          * should keep its own freeze count and use
1970          * a bottom half handler to run the queues
1971          * so we can unblock with our own lock held.
1972          */
1973         if (unblock_reqs)
1974                 scsi_unblock_requests(ahd->platform_data->host);
1975 }
1976
1977 static int
1978 ahd_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
1979 {
1980         struct ahd_softc *ahd;
1981         struct ahd_linux_device *dev;
1982         struct scb *pending_scb;
1983         u_int  saved_scbptr;
1984         u_int  active_scbptr;
1985         u_int  last_phase;
1986         u_int  saved_scsiid;
1987         u_int  cdb_byte;
1988         int    retval;
1989         int    was_paused;
1990         int    paused;
1991         int    wait;
1992         int    disconnected;
1993         ahd_mode_state saved_modes;
1994
1995         pending_scb = NULL;
1996         paused = FALSE;
1997         wait = FALSE;
1998         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
1999
2000         printf("%s:%d:%d:%d: Attempting to queue a%s message:",
2001                ahd_name(ahd), cmd->device->channel,
2002                cmd->device->id, cmd->device->lun,
2003                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2004
2005         printf("CDB:");
2006         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2007                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2008         printf("\n");
2009
2010         spin_lock_irq(&ahd->platform_data->spin_lock);
2011
2012         /*
2013          * First determine if we currently own this command.
2014          * Start by searching the device queue.  If not found
2015          * there, check the pending_scb list.  If not found
2016          * at all, and the system wanted us to just abort the
2017          * command, return success.
2018          */
2019         dev = scsi_transport_device_data(cmd->device);
2020
2021         if (dev == NULL) {
2022                 /*
2023                  * No target device for this command exists,
2024                  * so we must not still own the command.
2025                  */
2026                 printf("%s:%d:%d:%d: Is not an active device\n",
2027                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
2028                        cmd->device->lun);
2029                 retval = SUCCESS;
2030                 goto no_cmd;
2031         }
2032
2033         /*
2034          * See if we can find a matching cmd in the pending list.
2035          */
2036         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2037                 if (pending_scb->io_ctx == cmd)
2038                         break;
2039         }
2040
2041         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2042
2043                 /* Any SCB for this device will do for a target reset */
2044                 LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2045                         if (ahd_match_scb(ahd, pending_scb, cmd->device->id,
2046                                           cmd->device->channel + 'A',
2047                                           CAM_LUN_WILDCARD,
2048                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2049                                 break;
2050                 }
2051         }
2052
2053         if (pending_scb == NULL) {
2054                 printf("%s:%d:%d:%d: Command not found\n",
2055                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
2056                        cmd->device->lun);
2057                 goto no_cmd;
2058         }
2059
2060         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2061                 /*
2062                  * We can't queue two recovery actions using the same SCB
2063                  */
2064                 retval = FAILED;
2065                 goto  done;
2066         }
2067
2068         /*
2069          * Ensure that the card doesn't do anything
2070          * behind our back.  Also make sure that we
2071          * didn't "just" miss an interrupt that would
2072          * affect this cmd.
2073          */
2074         was_paused = ahd_is_paused(ahd);
2075         ahd_pause_and_flushwork(ahd);
2076         paused = TRUE;
2077
2078         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2079                 printf("%s:%d:%d:%d: Command already completed\n",
2080                        ahd_name(ahd), cmd->device->channel, cmd->device->id,
2081                        cmd->device->lun);
2082                 goto no_cmd;
2083         }
2084
2085         printf("%s: At time of recovery, card was %spaused\n",
2086                ahd_name(ahd), was_paused ? "" : "not ");
2087         ahd_dump_card_state(ahd);
2088
2089         disconnected = TRUE;
2090         if (flag == SCB_ABORT) {
2091                 if (ahd_search_qinfifo(ahd, cmd->device->id, 
2092                                        cmd->device->channel + 'A',
2093                                        cmd->device->lun, 
2094                                        pending_scb->hscb->tag,
2095                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2096                                        SEARCH_COMPLETE) > 0) {
2097                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2098                                ahd_name(ahd), cmd->device->channel, 
2099                                cmd->device->id, cmd->device->lun);
2100                         retval = SUCCESS;
2101                         goto done;
2102                 }
2103         } else if (ahd_search_qinfifo(ahd, cmd->device->id,
2104                                       cmd->device->channel + 'A',
2105                                       cmd->device->lun, pending_scb->hscb->tag,
2106                                       ROLE_INITIATOR, /*status*/0,
2107                                       SEARCH_COUNT) > 0) {
2108                 disconnected = FALSE;
2109         }
2110
2111         saved_modes = ahd_save_modes(ahd);
2112         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2113         last_phase = ahd_inb(ahd, LASTPHASE);
2114         saved_scbptr = ahd_get_scbptr(ahd);
2115         active_scbptr = saved_scbptr;
2116         if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2117                 struct scb *bus_scb;
2118
2119                 bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2120                 if (bus_scb == pending_scb)
2121                         disconnected = FALSE;
2122                 else if (flag != SCB_ABORT
2123                          && ahd_inb(ahd, SAVED_SCSIID) == pending_scb->hscb->scsiid
2124                          && ahd_inb(ahd, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2125                         disconnected = FALSE;
2126         }
2127
2128         /*
2129          * At this point, pending_scb is the scb associated with the
2130          * passed in command.  That command is currently active on the
2131          * bus or is in the disconnected state.
2132          */
2133         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
2134         if (last_phase != P_BUSFREE
2135          && (SCB_GET_TAG(pending_scb) == active_scbptr
2136              || (flag == SCB_DEVICE_RESET
2137                  && SCSIID_TARGET(ahd, saved_scsiid) == cmd->device->id))) {
2138
2139                 /*
2140                  * We're active on the bus, so assert ATN
2141                  * and hope that the target responds.
2142                  */
2143                 pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2144                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2145                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
2146                 ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2147                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
2148                        ahd_name(ahd), cmd->device->channel,
2149                        cmd->device->id, cmd->device->lun);
2150                 wait = TRUE;
2151         } else if (disconnected) {
2152
2153                 /*
2154                  * Actually re-queue this SCB in an attempt
2155                  * to select the device before it reconnects.
2156                  */
2157                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2158                 ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2159                 pending_scb->hscb->cdb_len = 0;
2160                 pending_scb->hscb->task_attribute = 0;
2161                 pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2162
2163                 if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2164                         /*
2165                          * Mark the SCB has having an outstanding
2166                          * task management function.  Should the command
2167                          * complete normally before the task management
2168                          * function can be sent, the host will be notified
2169                          * to abort our requeued SCB.
2170                          */
2171                         ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2172                                  pending_scb->hscb->task_management);
2173                 } else {
2174                         /*
2175                          * If non-packetized, set the MK_MESSAGE control
2176                          * bit indicating that we desire to send a message.
2177                          * We also set the disconnected flag since there is
2178                          * no guarantee that our SCB control byte matches
2179                          * the version on the card.  We don't want the
2180                          * sequencer to abort the command thinking an
2181                          * unsolicited reselection occurred.
2182                          */
2183                         pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2184
2185                         /*
2186                          * The sequencer will never re-reference the
2187                          * in-core SCB.  To make sure we are notified
2188                          * during reslection, set the MK_MESSAGE flag in
2189                          * the card's copy of the SCB.
2190                          */
2191                         ahd_outb(ahd, SCB_CONTROL,
2192                                  ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2193                 }
2194
2195                 /*
2196                  * Clear out any entries in the QINFIFO first
2197                  * so we are the next SCB for this target
2198                  * to run.
2199                  */
2200                 ahd_search_qinfifo(ahd, cmd->device->id,
2201                                    cmd->device->channel + 'A', cmd->device->lun,
2202                                    SCB_LIST_NULL, ROLE_INITIATOR,
2203                                    CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2204                 ahd_qinfifo_requeue_tail(ahd, pending_scb);
2205                 ahd_set_scbptr(ahd, saved_scbptr);
2206                 ahd_print_path(ahd, pending_scb);
2207                 printf("Device is disconnected, re-queuing SCB\n");
2208                 wait = TRUE;
2209         } else {
2210                 printf("%s:%d:%d:%d: Unable to deliver message\n",
2211                        ahd_name(ahd), cmd->device->channel,
2212                        cmd->device->id, cmd->device->lun);
2213                 retval = FAILED;
2214                 goto done;
2215         }
2216
2217 no_cmd:
2218         /*
2219          * Our assumption is that if we don't have the command, no
2220          * recovery action was required, so we return success.  Again,
2221          * the semantics of the mid-layer recovery engine are not
2222          * well defined, so this may change in time.
2223          */
2224         retval = SUCCESS;
2225 done:
2226         if (paused)
2227                 ahd_unpause(ahd);
2228         if (wait) {
2229                 struct timer_list timer;
2230                 int ret;
2231
2232                 ahd->platform_data->flags |= AHD_SCB_UP_EH_SEM;
2233                 spin_unlock_irq(&ahd->platform_data->spin_lock);
2234                 init_timer(&timer);
2235                 timer.data = (u_long)ahd;
2236                 timer.expires = jiffies + (5 * HZ);
2237                 timer.function = ahd_linux_sem_timeout;
2238                 add_timer(&timer);
2239                 printf("Recovery code sleeping\n");
2240                 down(&ahd->platform_data->eh_sem);
2241                 printf("Recovery code awake\n");
2242                 ret = del_timer_sync(&timer);
2243                 if (ret == 0) {
2244                         printf("Timer Expired\n");
2245                         retval = FAILED;
2246                 }
2247                 spin_lock_irq(&ahd->platform_data->spin_lock);
2248         }
2249         spin_unlock_irq(&ahd->platform_data->spin_lock);
2250         return (retval);
2251 }
2252
2253 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2254 {
2255         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2256         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2257         struct ahd_devinfo devinfo;
2258         unsigned long flags;
2259
2260         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2261                             starget->channel + 'A', ROLE_INITIATOR);
2262         ahd_lock(ahd, &flags);
2263         ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2264         ahd_unlock(ahd, &flags);
2265 }
2266
2267 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2268 {
2269         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2270         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2271         struct ahd_tmode_tstate *tstate;
2272         struct ahd_initiator_tinfo *tinfo 
2273                 = ahd_fetch_transinfo(ahd,
2274                                       starget->channel + 'A',
2275                                       shost->this_id, starget->id, &tstate);
2276         struct ahd_devinfo devinfo;
2277         unsigned int ppr_options = tinfo->goal.ppr_options;
2278         unsigned int dt;
2279         unsigned long flags;
2280         unsigned long offset = tinfo->goal.offset;
2281
2282 #ifdef AHD_DEBUG
2283         if ((ahd_debug & AHD_SHOW_DV) != 0)
2284                 printf("%s: set period to %d\n", ahd_name(ahd), period);
2285 #endif
2286         if (offset == 0)
2287                 offset = MAX_OFFSET;
2288
2289         if (period < 8)
2290                 period = 8;
2291         if (period < 10) {
2292                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2293                 if (period == 8)
2294                         ppr_options |= MSG_EXT_PPR_IU_REQ;
2295         }
2296
2297         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2298
2299         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2300                             starget->channel + 'A', ROLE_INITIATOR);
2301
2302         /* all PPR requests apart from QAS require wide transfers */
2303         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2304                 if (spi_width(starget) == 0)
2305                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2306         }
2307
2308         ahd_find_syncrate(ahd, &period, &ppr_options,
2309                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2310
2311         ahd_lock(ahd, &flags);
2312         ahd_set_syncrate(ahd, &devinfo, period, offset,
2313                          ppr_options, AHD_TRANS_GOAL, FALSE);
2314         ahd_unlock(ahd, &flags);
2315 }
2316
2317 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2318 {
2319         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2320         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2321         struct ahd_tmode_tstate *tstate;
2322         struct ahd_initiator_tinfo *tinfo 
2323                 = ahd_fetch_transinfo(ahd,
2324                                       starget->channel + 'A',
2325                                       shost->this_id, starget->id, &tstate);
2326         struct ahd_devinfo devinfo;
2327         unsigned int ppr_options = 0;
2328         unsigned int period = 0;
2329         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2330         unsigned long flags;
2331
2332 #ifdef AHD_DEBUG
2333         if ((ahd_debug & AHD_SHOW_DV) != 0)
2334                 printf("%s: set offset to %d\n", ahd_name(ahd), offset);
2335 #endif
2336
2337         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2338                             starget->channel + 'A', ROLE_INITIATOR);
2339         if (offset != 0) {
2340                 period = tinfo->goal.period;
2341                 ppr_options = tinfo->goal.ppr_options;
2342                 ahd_find_syncrate(ahd, &period, &ppr_options, 
2343                                   dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2344         }
2345
2346         ahd_lock(ahd, &flags);
2347         ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2348                          AHD_TRANS_GOAL, FALSE);
2349         ahd_unlock(ahd, &flags);
2350 }
2351
2352 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
2353 {
2354         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2355         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2356         struct ahd_tmode_tstate *tstate;
2357         struct ahd_initiator_tinfo *tinfo 
2358                 = ahd_fetch_transinfo(ahd,
2359                                       starget->channel + 'A',
2360                                       shost->this_id, starget->id, &tstate);
2361         struct ahd_devinfo devinfo;
2362         unsigned int ppr_options = tinfo->goal.ppr_options
2363                 & ~MSG_EXT_PPR_DT_REQ;
2364         unsigned int period = tinfo->goal.period;
2365         unsigned int width = tinfo->goal.width;
2366         unsigned long flags;
2367
2368 #ifdef AHD_DEBUG
2369         if ((ahd_debug & AHD_SHOW_DV) != 0)
2370                 printf("%s: %s DT\n", ahd_name(ahd), 
2371                        dt ? "enabling" : "disabling");
2372 #endif
2373         if (dt) {
2374                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2375                 if (!width)
2376                         ahd_linux_set_width(starget, 1);
2377         } else {
2378                 if (period <= 9)
2379                         period = 10; /* If resetting DT, period must be >= 25ns */
2380                 /* IU is invalid without DT set */
2381                 ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2382         }
2383         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2384                             starget->channel + 'A', ROLE_INITIATOR);
2385         ahd_find_syncrate(ahd, &period, &ppr_options,
2386                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2387
2388         ahd_lock(ahd, &flags);
2389         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2390                          ppr_options, AHD_TRANS_GOAL, FALSE);
2391         ahd_unlock(ahd, &flags);
2392 }
2393
2394 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2395 {
2396         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2397         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2398         struct ahd_tmode_tstate *tstate;
2399         struct ahd_initiator_tinfo *tinfo 
2400                 = ahd_fetch_transinfo(ahd,
2401                                       starget->channel + 'A',
2402                                       shost->this_id, starget->id, &tstate);
2403         struct ahd_devinfo devinfo;
2404         unsigned int ppr_options = tinfo->goal.ppr_options
2405                 & ~MSG_EXT_PPR_QAS_REQ;
2406         unsigned int period = tinfo->goal.period;
2407         unsigned int dt;
2408         unsigned long flags;
2409
2410 #ifdef AHD_DEBUG
2411         if ((ahd_debug & AHD_SHOW_DV) != 0)
2412                 printf("%s: %s QAS\n", ahd_name(ahd), 
2413                        qas ? "enabling" : "disabling");
2414 #endif
2415
2416         if (qas) {
2417                 ppr_options |= MSG_EXT_PPR_QAS_REQ; 
2418         }
2419
2420         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2421
2422         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2423                             starget->channel + 'A', ROLE_INITIATOR);
2424         ahd_find_syncrate(ahd, &period, &ppr_options,
2425                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2426
2427         ahd_lock(ahd, &flags);
2428         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2429                          ppr_options, AHD_TRANS_GOAL, FALSE);
2430         ahd_unlock(ahd, &flags);
2431 }
2432
2433 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2434 {
2435         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2436         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2437         struct ahd_tmode_tstate *tstate;
2438         struct ahd_initiator_tinfo *tinfo 
2439                 = ahd_fetch_transinfo(ahd,
2440                                       starget->channel + 'A',
2441                                       shost->this_id, starget->id, &tstate);
2442         struct ahd_devinfo devinfo;
2443         unsigned int ppr_options = tinfo->goal.ppr_options
2444                 & ~MSG_EXT_PPR_IU_REQ;
2445         unsigned int period = tinfo->goal.period;
2446         unsigned int dt;
2447         unsigned long flags;
2448
2449 #ifdef AHD_DEBUG
2450         if ((ahd_debug & AHD_SHOW_DV) != 0)
2451                 printf("%s: %s IU\n", ahd_name(ahd),
2452                        iu ? "enabling" : "disabling");
2453 #endif
2454
2455         if (iu) {
2456                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2457                 ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2458         }
2459
2460         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2461
2462         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2463                             starget->channel + 'A', ROLE_INITIATOR);
2464         ahd_find_syncrate(ahd, &period, &ppr_options,
2465                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2466
2467         ahd_lock(ahd, &flags);
2468         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2469                          ppr_options, AHD_TRANS_GOAL, FALSE);
2470         ahd_unlock(ahd, &flags);
2471 }
2472
2473 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2474 {
2475         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2476         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2477         struct ahd_tmode_tstate *tstate;
2478         struct ahd_initiator_tinfo *tinfo 
2479                 = ahd_fetch_transinfo(ahd,
2480                                       starget->channel + 'A',
2481                                       shost->this_id, starget->id, &tstate);
2482         struct ahd_devinfo devinfo;
2483         unsigned int ppr_options = tinfo->goal.ppr_options
2484                 & ~MSG_EXT_PPR_RD_STRM;
2485         unsigned int period = tinfo->goal.period;
2486         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2487         unsigned long flags;
2488
2489 #ifdef AHD_DEBUG
2490         if ((ahd_debug & AHD_SHOW_DV) != 0)
2491                 printf("%s: %s Read Streaming\n", ahd_name(ahd), 
2492                        rdstrm  ? "enabling" : "disabling");
2493 #endif
2494
2495         if (rdstrm)
2496                 ppr_options |= MSG_EXT_PPR_RD_STRM;
2497
2498         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2499                             starget->channel + 'A', ROLE_INITIATOR);
2500         ahd_find_syncrate(ahd, &period, &ppr_options,
2501                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2502
2503         ahd_lock(ahd, &flags);
2504         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2505                          ppr_options, AHD_TRANS_GOAL, FALSE);
2506         ahd_unlock(ahd, &flags);
2507 }
2508
2509 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2510 {
2511         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2512         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2513         struct ahd_tmode_tstate *tstate;
2514         struct ahd_initiator_tinfo *tinfo 
2515                 = ahd_fetch_transinfo(ahd,
2516                                       starget->channel + 'A',
2517                                       shost->this_id, starget->id, &tstate);
2518         struct ahd_devinfo devinfo;
2519         unsigned int ppr_options = tinfo->goal.ppr_options
2520                 & ~MSG_EXT_PPR_WR_FLOW;
2521         unsigned int period = tinfo->goal.period;
2522         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2523         unsigned long flags;
2524
2525 #ifdef AHD_DEBUG
2526         if ((ahd_debug & AHD_SHOW_DV) != 0)
2527                 printf("%s: %s Write Flow Control\n", ahd_name(ahd),
2528                        wrflow ? "enabling" : "disabling");
2529 #endif
2530
2531         if (wrflow)
2532                 ppr_options |= MSG_EXT_PPR_WR_FLOW;
2533
2534         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2535                             starget->channel + 'A', ROLE_INITIATOR);
2536         ahd_find_syncrate(ahd, &period, &ppr_options,
2537                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2538
2539         ahd_lock(ahd, &flags);
2540         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2541                          ppr_options, AHD_TRANS_GOAL, FALSE);
2542         ahd_unlock(ahd, &flags);
2543 }
2544
2545 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2546 {
2547         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2548         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2549         struct ahd_tmode_tstate *tstate;
2550         struct ahd_initiator_tinfo *tinfo 
2551                 = ahd_fetch_transinfo(ahd,
2552                                       starget->channel + 'A',
2553                                       shost->this_id, starget->id, &tstate);
2554         struct ahd_devinfo devinfo;
2555         unsigned int ppr_options = tinfo->goal.ppr_options
2556                 & ~MSG_EXT_PPR_RTI;
2557         unsigned int period = tinfo->goal.period;
2558         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2559         unsigned long flags;
2560
2561         if ((ahd->features & AHD_RTI) == 0) {
2562 #ifdef AHD_DEBUG
2563                 if ((ahd_debug & AHD_SHOW_DV) != 0)
2564                         printf("%s: RTI not available\n", ahd_name(ahd));
2565 #endif
2566                 return;
2567         }
2568
2569 #ifdef AHD_DEBUG
2570         if ((ahd_debug & AHD_SHOW_DV) != 0)
2571                 printf("%s: %s RTI\n", ahd_name(ahd),
2572                        rti ? "enabling" : "disabling");
2573 #endif
2574
2575         if (rti)
2576                 ppr_options |= MSG_EXT_PPR_RTI;
2577
2578         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2579                             starget->channel + 'A', ROLE_INITIATOR);
2580         ahd_find_syncrate(ahd, &period, &ppr_options,
2581                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2582
2583         ahd_lock(ahd, &flags);
2584         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2585                          ppr_options, AHD_TRANS_GOAL, FALSE);
2586         ahd_unlock(ahd, &flags);
2587 }
2588
2589 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2590 {
2591         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2592         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2593         struct ahd_tmode_tstate *tstate;
2594         struct ahd_initiator_tinfo *tinfo 
2595                 = ahd_fetch_transinfo(ahd,
2596                                       starget->channel + 'A',
2597                                       shost->this_id, starget->id, &tstate);
2598         struct ahd_devinfo devinfo;
2599         unsigned int ppr_options = tinfo->goal.ppr_options
2600                 & ~MSG_EXT_PPR_PCOMP_EN;
2601         unsigned int period = tinfo->goal.period;
2602         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2603         unsigned long flags;
2604
2605 #ifdef AHD_DEBUG
2606         if ((ahd_debug & AHD_SHOW_DV) != 0)
2607                 printf("%s: %s Precompensation\n", ahd_name(ahd), 
2608                        pcomp ? "Enable" : "Disable");
2609 #endif
2610
2611         if (pcomp)
2612                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2613
2614         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2615                             starget->channel + 'A', ROLE_INITIATOR);
2616         ahd_find_syncrate(ahd, &period, &ppr_options,
2617                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2618
2619         ahd_lock(ahd, &flags);
2620         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2621                          ppr_options, AHD_TRANS_GOAL, FALSE);
2622         ahd_unlock(ahd, &flags);
2623 }
2624
2625 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2626 {
2627         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2628         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2629         struct ahd_tmode_tstate *tstate;
2630         struct ahd_initiator_tinfo *tinfo 
2631                 = ahd_fetch_transinfo(ahd,
2632                                       starget->channel + 'A',
2633                                       shost->this_id, starget->id, &tstate);
2634         struct ahd_devinfo devinfo;
2635         unsigned int ppr_options = tinfo->goal.ppr_options
2636                 & ~MSG_EXT_PPR_HOLD_MCS;
2637         unsigned int period = tinfo->goal.period;
2638         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2639         unsigned long flags;
2640
2641         if (hold)
2642                 ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2643
2644         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2645                             starget->channel + 'A', ROLE_INITIATOR);
2646         ahd_find_syncrate(ahd, &period, &ppr_options,
2647                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2648
2649         ahd_lock(ahd, &flags);
2650         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2651                          ppr_options, AHD_TRANS_GOAL, FALSE);
2652         ahd_unlock(ahd, &flags);
2653 }
2654
2655
2656
2657 static struct spi_function_template ahd_linux_transport_functions = {
2658         .set_offset     = ahd_linux_set_offset,
2659         .show_offset    = 1,
2660         .set_period     = ahd_linux_set_period,
2661         .show_period    = 1,
2662         .set_width      = ahd_linux_set_width,
2663         .show_width     = 1,
2664         .set_dt         = ahd_linux_set_dt,
2665         .show_dt        = 1,
2666         .set_iu         = ahd_linux_set_iu,
2667         .show_iu        = 1,
2668         .set_qas        = ahd_linux_set_qas,
2669         .show_qas       = 1,
2670         .set_rd_strm    = ahd_linux_set_rd_strm,
2671         .show_rd_strm   = 1,
2672         .set_wr_flow    = ahd_linux_set_wr_flow,
2673         .show_wr_flow   = 1,
2674         .set_rti        = ahd_linux_set_rti,
2675         .show_rti       = 1,
2676         .set_pcomp_en   = ahd_linux_set_pcomp_en,
2677         .show_pcomp_en  = 1,
2678         .set_hold_mcs   = ahd_linux_set_hold_mcs,
2679         .show_hold_mcs  = 1,
2680 };
2681
2682 static int __init
2683 ahd_linux_init(void)
2684 {
2685         int     error = 0;
2686
2687         /*
2688          * If we've been passed any parameters, process them now.
2689          */
2690         if (aic79xx)
2691                 aic79xx_setup(aic79xx);
2692
2693         ahd_linux_transport_template =
2694                 spi_attach_transport(&ahd_linux_transport_functions);
2695         if (!ahd_linux_transport_template)
2696                 return -ENODEV;
2697
2698         scsi_transport_reserve_target(ahd_linux_transport_template,
2699                                       sizeof(struct ahd_linux_target));
2700         scsi_transport_reserve_device(ahd_linux_transport_template,
2701                                       sizeof(struct ahd_linux_device));
2702
2703         error = ahd_linux_pci_init();
2704         if (error)
2705                 spi_release_transport(ahd_linux_transport_template);
2706         return error;
2707 }
2708
2709 static void __exit
2710 ahd_linux_exit(void)
2711 {
2712         ahd_linux_pci_exit();
2713         spi_release_transport(ahd_linux_transport_template);
2714 }
2715
2716 module_init(ahd_linux_init);
2717 module_exit(ahd_linux_exit);