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