9328121804bbdf34b660cb6ecbb78db00fa41e77
[linux-2.6.git] / 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 #include <linux/slab.h>
57
58 /*
59  * Bucket size for counting good commands in between bad ones.
60  */
61 #define AHD_LINUX_ERR_THRESH    1000
62
63 /*
64  * Set this to the delay in seconds after SCSI bus reset.
65  * Note, we honor this only for the initial bus reset.
66  * The scsi error recovery code performs its own bus settle
67  * delay handling for error recovery actions.
68  */
69 #ifdef CONFIG_AIC79XX_RESET_DELAY_MS
70 #define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
71 #else
72 #define AIC79XX_RESET_DELAY 5000
73 #endif
74
75 /*
76  * To change the default number of tagged transactions allowed per-device,
77  * add a line to the lilo.conf file like:
78  * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
79  * which will result in the first four devices on the first two
80  * controllers being set to a tagged queue depth of 32.
81  *
82  * The tag_commands is an array of 16 to allow for wide and twin adapters.
83  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
84  * for channel 1.
85  */
86 typedef struct {
87         uint16_t tag_commands[16];      /* Allow for wide/twin adapters. */
88 } adapter_tag_info_t;
89
90 /*
91  * Modify this as you see fit for your system.
92  *
93  * 0                    tagged queuing disabled
94  * 1 <= n <= 253        n == max tags ever dispatched.
95  *
96  * The driver will throttle the number of commands dispatched to a
97  * device if it returns queue full.  For devices with a fixed maximum
98  * queue depth, the driver will eventually determine this depth and
99  * lock it in (a console message is printed to indicate that a lock
100  * has occurred).  On some devices, queue full is returned for a temporary
101  * resource shortage.  These devices will return queue full at varying
102  * depths.  The driver will throttle back when the queue fulls occur and
103  * attempt to slowly increase the depth over time as the device recovers
104  * from the resource shortage.
105  *
106  * In this example, the first line will disable tagged queueing for all
107  * the devices on the first probed aic79xx adapter.
108  *
109  * The second line enables tagged queueing with 4 commands/LUN for IDs
110  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
111  * driver to attempt to use up to 64 tags for ID 1.
112  *
113  * The third line is the same as the first line.
114  *
115  * The fourth line disables tagged queueing for devices 0 and 3.  It
116  * enables tagged queueing for the other IDs, with 16 commands/LUN
117  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
118  * IDs 2, 5-7, and 9-15.
119  */
120
121 /*
122  * NOTE: The below structure is for reference only, the actual structure
123  *       to modify in order to change things is just below this comment block.
124 adapter_tag_info_t aic79xx_tag_info[] =
125 {
126         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
127         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
128         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
129         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
130 };
131 */
132
133 #ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
134 #define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
135 #else
136 #define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
137 #endif
138
139 #define AIC79XX_CONFIGED_TAG_COMMANDS {                                 \
140         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
141         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
142         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
143         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
144         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
145         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
146         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
147         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE                \
148 }
149
150 /*
151  * By default, use the number of commands specified by
152  * the users kernel configuration.
153  */
154 static adapter_tag_info_t aic79xx_tag_info[] =
155 {
156         {AIC79XX_CONFIGED_TAG_COMMANDS},
157         {AIC79XX_CONFIGED_TAG_COMMANDS},
158         {AIC79XX_CONFIGED_TAG_COMMANDS},
159         {AIC79XX_CONFIGED_TAG_COMMANDS},
160         {AIC79XX_CONFIGED_TAG_COMMANDS},
161         {AIC79XX_CONFIGED_TAG_COMMANDS},
162         {AIC79XX_CONFIGED_TAG_COMMANDS},
163         {AIC79XX_CONFIGED_TAG_COMMANDS},
164         {AIC79XX_CONFIGED_TAG_COMMANDS},
165         {AIC79XX_CONFIGED_TAG_COMMANDS},
166         {AIC79XX_CONFIGED_TAG_COMMANDS},
167         {AIC79XX_CONFIGED_TAG_COMMANDS},
168         {AIC79XX_CONFIGED_TAG_COMMANDS},
169         {AIC79XX_CONFIGED_TAG_COMMANDS},
170         {AIC79XX_CONFIGED_TAG_COMMANDS},
171         {AIC79XX_CONFIGED_TAG_COMMANDS}
172 };
173
174 /*
175  * The I/O cell on the chip is very configurable in respect to its analog
176  * characteristics.  Set the defaults here; they can be overriden with
177  * the proper insmod parameters.
178  */
179 struct ahd_linux_iocell_opts
180 {
181         uint8_t precomp;
182         uint8_t slewrate;
183         uint8_t amplitude;
184 };
185 #define AIC79XX_DEFAULT_PRECOMP         0xFF
186 #define AIC79XX_DEFAULT_SLEWRATE        0xFF
187 #define AIC79XX_DEFAULT_AMPLITUDE       0xFF
188 #define AIC79XX_DEFAULT_IOOPTS                  \
189 {                                               \
190         AIC79XX_DEFAULT_PRECOMP,                \
191         AIC79XX_DEFAULT_SLEWRATE,               \
192         AIC79XX_DEFAULT_AMPLITUDE               \
193 }
194 #define AIC79XX_PRECOMP_INDEX   0
195 #define AIC79XX_SLEWRATE_INDEX  1
196 #define AIC79XX_AMPLITUDE_INDEX 2
197 static const struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
198 {
199         AIC79XX_DEFAULT_IOOPTS,
200         AIC79XX_DEFAULT_IOOPTS,
201         AIC79XX_DEFAULT_IOOPTS,
202         AIC79XX_DEFAULT_IOOPTS,
203         AIC79XX_DEFAULT_IOOPTS,
204         AIC79XX_DEFAULT_IOOPTS,
205         AIC79XX_DEFAULT_IOOPTS,
206         AIC79XX_DEFAULT_IOOPTS,
207         AIC79XX_DEFAULT_IOOPTS,
208         AIC79XX_DEFAULT_IOOPTS,
209         AIC79XX_DEFAULT_IOOPTS,
210         AIC79XX_DEFAULT_IOOPTS,
211         AIC79XX_DEFAULT_IOOPTS,
212         AIC79XX_DEFAULT_IOOPTS,
213         AIC79XX_DEFAULT_IOOPTS,
214         AIC79XX_DEFAULT_IOOPTS
215 };
216
217 /*
218  * There should be a specific return value for this in scsi.h, but
219  * it seems that most drivers ignore it.
220  */
221 #define DID_UNDERFLOW   DID_ERROR
222
223 void
224 ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
225 {
226         printk("(scsi%d:%c:%d:%d): ",
227                ahd->platform_data->host->host_no,
228                scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
229                scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
230                scb != NULL ? SCB_GET_LUN(scb) : -1);
231 }
232
233 /*
234  * XXX - these options apply unilaterally to _all_ adapters
235  *       cards in the system.  This should be fixed.  Exceptions to this
236  *       rule are noted in the comments.
237  */
238
239 /*
240  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
241  * has no effect on any later resets that might occur due to things like
242  * SCSI bus timeouts.
243  */
244 static uint32_t aic79xx_no_reset;
245
246 /*
247  * Should we force EXTENDED translation on a controller.
248  *     0 == Use whatever is in the SEEPROM or default to off
249  *     1 == Use whatever is in the SEEPROM or default to on
250  */
251 static uint32_t aic79xx_extended;
252
253 /*
254  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
255  * dubious at best.  To my knowledge, this option has never actually
256  * solved a PCI parity problem, but on certain machines with broken PCI
257  * chipset configurations, it can generate tons of false error messages.
258  * It's included in the driver for completeness.
259  *   0     = Shut off PCI parity check
260  *   non-0 = Enable PCI parity check
261  *
262  * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
263  * variable to -1 you would actually want to simply pass the variable
264  * name without a number.  That will invert the 0 which will result in
265  * -1.
266  */
267 static uint32_t aic79xx_pci_parity = ~0;
268
269 /*
270  * There are lots of broken chipsets in the world.  Some of them will
271  * violate the PCI spec when we issue byte sized memory writes to our
272  * controller.  I/O mapped register access, if allowed by the given
273  * platform, will work in almost all cases.
274  */
275 uint32_t aic79xx_allow_memio = ~0;
276
277 /*
278  * So that we can set how long each device is given as a selection timeout.
279  * The table of values goes like this:
280  *   0 - 256ms
281  *   1 - 128ms
282  *   2 - 64ms
283  *   3 - 32ms
284  * We default to 256ms because some older devices need a longer time
285  * to respond to initial selection.
286  */
287 static uint32_t aic79xx_seltime;
288
289 /*
290  * Certain devices do not perform any aging on commands.  Should the
291  * device be saturated by commands in one portion of the disk, it is
292  * possible for transactions on far away sectors to never be serviced.
293  * To handle these devices, we can periodically send an ordered tag to
294  * force all outstanding transactions to be serviced prior to a new
295  * transaction.
296  */
297 static uint32_t aic79xx_periodic_otag;
298
299 /* Some storage boxes are using an LSI chip which has a bug making it
300  * impossible to use aic79xx Rev B chip in 320 speeds.  The following
301  * storage boxes have been reported to be buggy:
302  * EonStor 3U 16-Bay: U16U-G3A3
303  * EonStor 2U 12-Bay: U12U-G3A3
304  * SentinelRAID: 2500F R5 / R6
305  * SentinelRAID: 2500F R1
306  * SentinelRAID: 2500F/1500F
307  * SentinelRAID: 150F
308  * 
309  * To get around this LSI bug, you can set your board to 160 mode
310  * or you can enable the SLOWCRC bit.
311  */
312 uint32_t aic79xx_slowcrc;
313
314 /*
315  * Module information and settable options.
316  */
317 static char *aic79xx = NULL;
318
319 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
320 MODULE_DESCRIPTION("Adaptec AIC790X U320 SCSI Host Bus Adapter driver");
321 MODULE_LICENSE("Dual BSD/GPL");
322 MODULE_VERSION(AIC79XX_DRIVER_VERSION);
323 module_param(aic79xx, charp, 0444);
324 MODULE_PARM_DESC(aic79xx,
325 "period-delimited options string:\n"
326 "       verbose                 Enable verbose/diagnostic logging\n"
327 "       allow_memio             Allow device registers to be memory mapped\n"
328 "       debug                   Bitmask of debug values to enable\n"
329 "       no_reset                Suppress initial bus resets\n"
330 "       extended                Enable extended geometry on all controllers\n"
331 "       periodic_otag           Send an ordered tagged transaction\n"
332 "                               periodically to prevent tag starvation.\n"
333 "                               This may be required by some older disk\n"
334 "                               or drives/RAID arrays.\n"
335 "       tag_info:<tag_str>      Set per-target tag depth\n"
336 "       global_tag_depth:<int>  Global tag depth for all targets on all buses\n"
337 "       slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
338 "       precomp:<pcomp_list>    Set the signal precompensation (0-7).\n"
339 "       amplitude:<int>         Set the signal amplitude (0-7).\n"
340 "       seltime:<int>           Selection Timeout:\n"
341 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
342 "       slowcrc                 Turn on the SLOWCRC bit (Rev B only)\n"          
343 "\n"
344 "       Sample modprobe configuration file:\n"
345 "       #       Enable verbose logging\n"
346 "       #       Set tag depth on Controller 2/Target 2 to 10 tags\n"
347 "       #       Shorten the selection timeout to 128ms\n"
348 "\n"
349 "       options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
350 );
351
352 static void ahd_linux_handle_scsi_status(struct ahd_softc *,
353                                          struct scsi_device *,
354                                          struct scb *);
355 static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
356                                          struct scsi_cmnd *cmd);
357 static int ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd);
358 static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
359 static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
360                                      struct ahd_devinfo *devinfo);
361 static void ahd_linux_device_queue_depth(struct scsi_device *);
362 static int ahd_linux_run_command(struct ahd_softc*,
363                                  struct ahd_linux_device *,
364                                  struct scsi_cmnd *);
365 static void ahd_linux_setup_tag_info_global(char *p);
366 static int  aic79xx_setup(char *c);
367 static void ahd_freeze_simq(struct ahd_softc *ahd);
368 static void ahd_release_simq(struct ahd_softc *ahd);
369
370 static int ahd_linux_unit;
371
372
373 /************************** OS Utility Wrappers *******************************/
374 void ahd_delay(long);
375 void
376 ahd_delay(long usec)
377 {
378         /*
379          * udelay on Linux can have problems for
380          * multi-millisecond waits.  Wait at most
381          * 1024us per call.
382          */
383         while (usec > 0) {
384                 udelay(usec % 1024);
385                 usec -= 1024;
386         }
387 }
388
389
390 /***************************** Low Level I/O **********************************/
391 uint8_t ahd_inb(struct ahd_softc * ahd, long port);
392 void ahd_outb(struct ahd_softc * ahd, long port, uint8_t val);
393 void ahd_outw_atomic(struct ahd_softc * ahd,
394                                      long port, uint16_t val);
395 void ahd_outsb(struct ahd_softc * ahd, long port,
396                                uint8_t *, int count);
397 void ahd_insb(struct ahd_softc * ahd, long port,
398                                uint8_t *, int count);
399
400 uint8_t
401 ahd_inb(struct ahd_softc * ahd, long port)
402 {
403         uint8_t x;
404
405         if (ahd->tags[0] == BUS_SPACE_MEMIO) {
406                 x = readb(ahd->bshs[0].maddr + port);
407         } else {
408                 x = inb(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
409         }
410         mb();
411         return (x);
412 }
413
414 #if 0 /* unused */
415 static uint16_t
416 ahd_inw_atomic(struct ahd_softc * ahd, long port)
417 {
418         uint8_t x;
419
420         if (ahd->tags[0] == BUS_SPACE_MEMIO) {
421                 x = readw(ahd->bshs[0].maddr + port);
422         } else {
423                 x = inw(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
424         }
425         mb();
426         return (x);
427 }
428 #endif
429
430 void
431 ahd_outb(struct ahd_softc * ahd, long port, uint8_t val)
432 {
433         if (ahd->tags[0] == BUS_SPACE_MEMIO) {
434                 writeb(val, ahd->bshs[0].maddr + port);
435         } else {
436                 outb(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
437         }
438         mb();
439 }
440
441 void
442 ahd_outw_atomic(struct ahd_softc * ahd, long port, uint16_t val)
443 {
444         if (ahd->tags[0] == BUS_SPACE_MEMIO) {
445                 writew(val, ahd->bshs[0].maddr + port);
446         } else {
447                 outw(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
448         }
449         mb();
450 }
451
452 void
453 ahd_outsb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
454 {
455         int i;
456
457         /*
458          * There is probably a more efficient way to do this on Linux
459          * but we don't use this for anything speed critical and this
460          * should work.
461          */
462         for (i = 0; i < count; i++)
463                 ahd_outb(ahd, port, *array++);
464 }
465
466 void
467 ahd_insb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
468 {
469         int i;
470
471         /*
472          * There is probably a more efficient way to do this on Linux
473          * but we don't use this for anything speed critical and this
474          * should work.
475          */
476         for (i = 0; i < count; i++)
477                 *array++ = ahd_inb(ahd, port);
478 }
479
480 /******************************* PCI Routines *********************************/
481 uint32_t
482 ahd_pci_read_config(ahd_dev_softc_t pci, int reg, int width)
483 {
484         switch (width) {
485         case 1:
486         {
487                 uint8_t retval;
488
489                 pci_read_config_byte(pci, reg, &retval);
490                 return (retval);
491         }
492         case 2:
493         {
494                 uint16_t retval;
495                 pci_read_config_word(pci, reg, &retval);
496                 return (retval);
497         }
498         case 4:
499         {
500                 uint32_t retval;
501                 pci_read_config_dword(pci, reg, &retval);
502                 return (retval);
503         }
504         default:
505                 panic("ahd_pci_read_config: Read size too big");
506                 /* NOTREACHED */
507                 return (0);
508         }
509 }
510
511 void
512 ahd_pci_write_config(ahd_dev_softc_t pci, int reg, uint32_t value, int width)
513 {
514         switch (width) {
515         case 1:
516                 pci_write_config_byte(pci, reg, value);
517                 break;
518         case 2:
519                 pci_write_config_word(pci, reg, value);
520                 break;
521         case 4:
522                 pci_write_config_dword(pci, reg, value);
523                 break;
524         default:
525                 panic("ahd_pci_write_config: Write size too big");
526                 /* NOTREACHED */
527         }
528 }
529
530 /****************************** Inlines ***************************************/
531 static void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
532
533 static void
534 ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
535 {
536         struct scsi_cmnd *cmd;
537
538         cmd = scb->io_ctx;
539         ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
540         scsi_dma_unmap(cmd);
541 }
542
543 /******************************** Macros **************************************/
544 #define BUILD_SCSIID(ahd, cmd)                                          \
545         (((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)
546
547 /*
548  * Return a string describing the driver.
549  */
550 static const char *
551 ahd_linux_info(struct Scsi_Host *host)
552 {
553         static char buffer[512];
554         char    ahd_info[256];
555         char   *bp;
556         struct ahd_softc *ahd;
557
558         bp = &buffer[0];
559         ahd = *(struct ahd_softc **)host->hostdata;
560         memset(bp, 0, sizeof(buffer));
561         strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev " AIC79XX_DRIVER_VERSION "\n"
562                         "        <");
563         strcat(bp, ahd->description);
564         strcat(bp, ">\n"
565                         "        ");
566         ahd_controller_info(ahd, ahd_info);
567         strcat(bp, ahd_info);
568
569         return (bp);
570 }
571
572 /*
573  * Queue an SCB to the controller.
574  */
575 static int
576 ahd_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
577 {
578         struct   ahd_softc *ahd;
579         struct   ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
580         int rtn = SCSI_MLQUEUE_HOST_BUSY;
581
582         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
583
584         cmd->scsi_done = scsi_done;
585         cmd->result = CAM_REQ_INPROG << 16;
586         rtn = ahd_linux_run_command(ahd, dev, cmd);
587
588         return rtn;
589 }
590
591 static DEF_SCSI_QCMD(ahd_linux_queue)
592
593 static struct scsi_target **
594 ahd_linux_target_in_softc(struct scsi_target *starget)
595 {
596         struct  ahd_softc *ahd =
597                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
598         unsigned int target_offset;
599
600         target_offset = starget->id;
601         if (starget->channel != 0)
602                 target_offset += 8;
603
604         return &ahd->platform_data->starget[target_offset];
605 }
606
607 static int
608 ahd_linux_target_alloc(struct scsi_target *starget)
609 {
610         struct  ahd_softc *ahd =
611                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
612         struct seeprom_config *sc = ahd->seep_config;
613         unsigned long flags;
614         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
615         struct ahd_devinfo devinfo;
616         struct ahd_initiator_tinfo *tinfo;
617         struct ahd_tmode_tstate *tstate;
618         char channel = starget->channel + 'A';
619
620         ahd_lock(ahd, &flags);
621
622         BUG_ON(*ahd_targp != NULL);
623
624         *ahd_targp = starget;
625
626         if (sc) {
627                 int flags = sc->device_flags[starget->id];
628
629                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
630                                             starget->id, &tstate);
631
632                 if ((flags  & CFPACKETIZED) == 0) {
633                         /* don't negotiate packetized (IU) transfers */
634                         spi_max_iu(starget) = 0;
635                 } else {
636                         if ((ahd->features & AHD_RTI) == 0)
637                                 spi_rti(starget) = 0;
638                 }
639
640                 if ((flags & CFQAS) == 0)
641                         spi_max_qas(starget) = 0;
642
643                 /* Transinfo values have been set to BIOS settings */
644                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
645                 spi_min_period(starget) = tinfo->user.period;
646                 spi_max_offset(starget) = tinfo->user.offset;
647         }
648
649         tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
650                                     starget->id, &tstate);
651         ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
652                             CAM_LUN_WILDCARD, channel,
653                             ROLE_INITIATOR);
654         ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
655                          AHD_TRANS_GOAL, /*paused*/FALSE);
656         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
657                       AHD_TRANS_GOAL, /*paused*/FALSE);
658         ahd_unlock(ahd, &flags);
659
660         return 0;
661 }
662
663 static void
664 ahd_linux_target_destroy(struct scsi_target *starget)
665 {
666         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
667
668         *ahd_targp = NULL;
669 }
670
671 static int
672 ahd_linux_slave_alloc(struct scsi_device *sdev)
673 {
674         struct  ahd_softc *ahd =
675                 *((struct ahd_softc **)sdev->host->hostdata);
676         struct ahd_linux_device *dev;
677
678         if (bootverbose)
679                 printk("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
680
681         dev = scsi_transport_device_data(sdev);
682         memset(dev, 0, sizeof(*dev));
683
684         /*
685          * We start out life using untagged
686          * transactions of which we allow one.
687          */
688         dev->openings = 1;
689
690         /*
691          * Set maxtags to 0.  This will be changed if we
692          * later determine that we are dealing with
693          * a tagged queuing capable device.
694          */
695         dev->maxtags = 0;
696         
697         return (0);
698 }
699
700 static int
701 ahd_linux_slave_configure(struct scsi_device *sdev)
702 {
703         struct  ahd_softc *ahd;
704
705         ahd = *((struct ahd_softc **)sdev->host->hostdata);
706         if (bootverbose)
707                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
708
709         ahd_linux_device_queue_depth(sdev);
710
711         /* Initial Domain Validation */
712         if (!spi_initial_dv(sdev->sdev_target))
713                 spi_dv_device(sdev);
714
715         return 0;
716 }
717
718 #if defined(__i386__)
719 /*
720  * Return the disk geometry for the given SCSI device.
721  */
722 static int
723 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
724                     sector_t capacity, int geom[])
725 {
726         uint8_t *bh;
727         int      heads;
728         int      sectors;
729         int      cylinders;
730         int      ret;
731         int      extended;
732         struct   ahd_softc *ahd;
733
734         ahd = *((struct ahd_softc **)sdev->host->hostdata);
735
736         bh = scsi_bios_ptable(bdev);
737         if (bh) {
738                 ret = scsi_partsize(bh, capacity,
739                                     &geom[2], &geom[0], &geom[1]);
740                 kfree(bh);
741                 if (ret != -1)
742                         return (ret);
743         }
744         heads = 64;
745         sectors = 32;
746         cylinders = aic_sector_div(capacity, heads, sectors);
747
748         if (aic79xx_extended != 0)
749                 extended = 1;
750         else
751                 extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
752         if (extended && cylinders >= 1024) {
753                 heads = 255;
754                 sectors = 63;
755                 cylinders = aic_sector_div(capacity, heads, sectors);
756         }
757         geom[0] = heads;
758         geom[1] = sectors;
759         geom[2] = cylinders;
760         return (0);
761 }
762 #endif
763
764 /*
765  * Abort the current SCSI command(s).
766  */
767 static int
768 ahd_linux_abort(struct scsi_cmnd *cmd)
769 {
770         int error;
771         
772         error = ahd_linux_queue_abort_cmd(cmd);
773
774         return error;
775 }
776
777 /*
778  * Attempt to send a target reset message to the device that timed out.
779  */
780 static int
781 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
782 {
783         struct ahd_softc *ahd;
784         struct ahd_linux_device *dev;
785         struct scb *reset_scb;
786         u_int  cdb_byte;
787         int    retval = SUCCESS;
788         int    paused;
789         int    wait;
790         struct  ahd_initiator_tinfo *tinfo;
791         struct  ahd_tmode_tstate *tstate;
792         unsigned long flags;
793         DECLARE_COMPLETION_ONSTACK(done);
794
795         reset_scb = NULL;
796         paused = FALSE;
797         wait = FALSE;
798         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
799
800         scmd_printk(KERN_INFO, cmd,
801                     "Attempting to queue a TARGET RESET message:");
802
803         printk("CDB:");
804         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
805                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
806         printk("\n");
807
808         /*
809          * Determine if we currently own this command.
810          */
811         dev = scsi_transport_device_data(cmd->device);
812
813         if (dev == NULL) {
814                 /*
815                  * No target device for this command exists,
816                  * so we must not still own the command.
817                  */
818                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
819                 return SUCCESS;
820         }
821
822         /*
823          * Generate us a new SCB
824          */
825         reset_scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX);
826         if (!reset_scb) {
827                 scmd_printk(KERN_INFO, cmd, "No SCB available\n");
828                 return FAILED;
829         }
830
831         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
832                                     cmd->device->id, &tstate);
833         reset_scb->io_ctx = cmd;
834         reset_scb->platform_data->dev = dev;
835         reset_scb->sg_count = 0;
836         ahd_set_residual(reset_scb, 0);
837         ahd_set_sense_residual(reset_scb, 0);
838         reset_scb->platform_data->xfer_len = 0;
839         reset_scb->hscb->control = 0;
840         reset_scb->hscb->scsiid = BUILD_SCSIID(ahd,cmd);
841         reset_scb->hscb->lun = cmd->device->lun;
842         reset_scb->hscb->cdb_len = 0;
843         reset_scb->hscb->task_management = SIU_TASKMGMT_LUN_RESET;
844         reset_scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
845         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
846                 reset_scb->flags |= SCB_PACKETIZED;
847         } else {
848                 reset_scb->hscb->control |= MK_MESSAGE;
849         }
850         dev->openings--;
851         dev->active++;
852         dev->commands_issued++;
853
854         ahd_lock(ahd, &flags);
855
856         LIST_INSERT_HEAD(&ahd->pending_scbs, reset_scb, pending_links);
857         ahd_queue_scb(ahd, reset_scb);
858
859         ahd->platform_data->eh_done = &done;
860         ahd_unlock(ahd, &flags);
861
862         printk("%s: Device reset code sleeping\n", ahd_name(ahd));
863         if (!wait_for_completion_timeout(&done, 5 * HZ)) {
864                 ahd_lock(ahd, &flags);
865                 ahd->platform_data->eh_done = NULL;
866                 ahd_unlock(ahd, &flags);
867                 printk("%s: Device reset timer expired (active %d)\n",
868                        ahd_name(ahd), dev->active);
869                 retval = FAILED;
870         }
871         printk("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
872
873         return (retval);
874 }
875
876 /*
877  * Reset the SCSI bus.
878  */
879 static int
880 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
881 {
882         struct ahd_softc *ahd;
883         int    found;
884         unsigned long flags;
885
886         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
887 #ifdef AHD_DEBUG
888         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
889                 printk("%s: Bus reset called for cmd %p\n",
890                        ahd_name(ahd), cmd);
891 #endif
892         ahd_lock(ahd, &flags);
893
894         found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
895                                   /*initiate reset*/TRUE);
896         ahd_unlock(ahd, &flags);
897
898         if (bootverbose)
899                 printk("%s: SCSI bus reset delivered. "
900                        "%d SCBs aborted.\n", ahd_name(ahd), found);
901
902         return (SUCCESS);
903 }
904
905 struct scsi_host_template aic79xx_driver_template = {
906         .module                 = THIS_MODULE,
907         .name                   = "aic79xx",
908         .proc_name              = "aic79xx",
909         .proc_info              = ahd_linux_proc_info,
910         .info                   = ahd_linux_info,
911         .queuecommand           = ahd_linux_queue,
912         .eh_abort_handler       = ahd_linux_abort,
913         .eh_device_reset_handler = ahd_linux_dev_reset,
914         .eh_bus_reset_handler   = ahd_linux_bus_reset,
915 #if defined(__i386__)
916         .bios_param             = ahd_linux_biosparam,
917 #endif
918         .can_queue              = AHD_MAX_QUEUE,
919         .this_id                = -1,
920         .max_sectors            = 8192,
921         .cmd_per_lun            = 2,
922         .use_clustering         = ENABLE_CLUSTERING,
923         .slave_alloc            = ahd_linux_slave_alloc,
924         .slave_configure        = ahd_linux_slave_configure,
925         .target_alloc           = ahd_linux_target_alloc,
926         .target_destroy         = ahd_linux_target_destroy,
927 };
928
929 /******************************** Bus DMA *************************************/
930 int
931 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
932                    bus_size_t alignment, bus_size_t boundary,
933                    dma_addr_t lowaddr, dma_addr_t highaddr,
934                    bus_dma_filter_t *filter, void *filterarg,
935                    bus_size_t maxsize, int nsegments,
936                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
937 {
938         bus_dma_tag_t dmat;
939
940         dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
941         if (dmat == NULL)
942                 return (ENOMEM);
943
944         /*
945          * Linux is very simplistic about DMA memory.  For now don't
946          * maintain all specification information.  Once Linux supplies
947          * better facilities for doing these operations, or the
948          * needs of this particular driver change, we might need to do
949          * more here.
950          */
951         dmat->alignment = alignment;
952         dmat->boundary = boundary;
953         dmat->maxsize = maxsize;
954         *ret_tag = dmat;
955         return (0);
956 }
957
958 void
959 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
960 {
961         kfree(dmat);
962 }
963
964 int
965 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
966                  int flags, bus_dmamap_t *mapp)
967 {
968         *vaddr = pci_alloc_consistent(ahd->dev_softc,
969                                       dmat->maxsize, mapp);
970         if (*vaddr == NULL)
971                 return (ENOMEM);
972         return(0);
973 }
974
975 void
976 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
977                 void* vaddr, bus_dmamap_t map)
978 {
979         pci_free_consistent(ahd->dev_softc, dmat->maxsize,
980                             vaddr, map);
981 }
982
983 int
984 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
985                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
986                 void *cb_arg, int flags)
987 {
988         /*
989          * Assume for now that this will only be used during
990          * initialization and not for per-transaction buffer mapping.
991          */
992         bus_dma_segment_t stack_sg;
993
994         stack_sg.ds_addr = map;
995         stack_sg.ds_len = dmat->maxsize;
996         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
997         return (0);
998 }
999
1000 void
1001 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
1002 {
1003 }
1004
1005 int
1006 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
1007 {
1008         /* Nothing to do */
1009         return (0);
1010 }
1011
1012 /********************* Platform Dependent Functions ***************************/
1013 static void
1014 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
1015 {
1016
1017         if ((instance >= 0)
1018          && (instance < ARRAY_SIZE(aic79xx_iocell_info))) {
1019                 uint8_t *iocell_info;
1020
1021                 iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
1022                 iocell_info[index] = value & 0xFFFF;
1023                 if (bootverbose)
1024                         printk("iocell[%d:%ld] = %d\n", instance, index, value);
1025         }
1026 }
1027
1028 static void
1029 ahd_linux_setup_tag_info_global(char *p)
1030 {
1031         int tags, i, j;
1032
1033         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1034         printk("Setting Global Tags= %d\n", tags);
1035
1036         for (i = 0; i < ARRAY_SIZE(aic79xx_tag_info); i++) {
1037                 for (j = 0; j < AHD_NUM_TARGETS; j++) {
1038                         aic79xx_tag_info[i].tag_commands[j] = tags;
1039                 }
1040         }
1041 }
1042
1043 static void
1044 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1045 {
1046
1047         if ((instance >= 0) && (targ >= 0)
1048          && (instance < ARRAY_SIZE(aic79xx_tag_info))
1049          && (targ < AHD_NUM_TARGETS)) {
1050                 aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
1051                 if (bootverbose)
1052                         printk("tag_info[%d:%d] = %d\n", instance, targ, value);
1053         }
1054 }
1055
1056 static char *
1057 ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
1058                        void (*callback)(u_long, int, int, int32_t),
1059                        u_long callback_arg)
1060 {
1061         char    *tok_end;
1062         char    *tok_end2;
1063         int      i;
1064         int      instance;
1065         int      targ;
1066         int      done;
1067         char     tok_list[] = {'.', ',', '{', '}', '\0'};
1068
1069         /* All options use a ':' name/arg separator */
1070         if (*opt_arg != ':')
1071                 return (opt_arg);
1072         opt_arg++;
1073         instance = -1;
1074         targ = -1;
1075         done = FALSE;
1076         /*
1077          * Restore separator that may be in
1078          * the middle of our option argument.
1079          */
1080         tok_end = strchr(opt_arg, '\0');
1081         if (tok_end < end)
1082                 *tok_end = ',';
1083         while (!done) {
1084                 switch (*opt_arg) {
1085                 case '{':
1086                         if (instance == -1) {
1087                                 instance = 0;
1088                         } else {
1089                                 if (depth > 1) {
1090                                         if (targ == -1)
1091                                                 targ = 0;
1092                                 } else {
1093                                         printk("Malformed Option %s\n",
1094                                                opt_name);
1095                                         done = TRUE;
1096                                 }
1097                         }
1098                         opt_arg++;
1099                         break;
1100                 case '}':
1101                         if (targ != -1)
1102                                 targ = -1;
1103                         else if (instance != -1)
1104                                 instance = -1;
1105                         opt_arg++;
1106                         break;
1107                 case ',':
1108                 case '.':
1109                         if (instance == -1)
1110                                 done = TRUE;
1111                         else if (targ >= 0)
1112                                 targ++;
1113                         else if (instance >= 0)
1114                                 instance++;
1115                         opt_arg++;
1116                         break;
1117                 case '\0':
1118                         done = TRUE;
1119                         break;
1120                 default:
1121                         tok_end = end;
1122                         for (i = 0; tok_list[i]; i++) {
1123                                 tok_end2 = strchr(opt_arg, tok_list[i]);
1124                                 if ((tok_end2) && (tok_end2 < tok_end))
1125                                         tok_end = tok_end2;
1126                         }
1127                         callback(callback_arg, instance, targ,
1128                                  simple_strtol(opt_arg, NULL, 0));
1129                         opt_arg = tok_end;
1130                         break;
1131                 }
1132         }
1133         return (opt_arg);
1134 }
1135
1136 /*
1137  * Handle Linux boot parameters. This routine allows for assigning a value
1138  * to a parameter with a ':' between the parameter and the value.
1139  * ie. aic79xx=stpwlev:1,extended
1140  */
1141 static int
1142 aic79xx_setup(char *s)
1143 {
1144         int     i, n;
1145         char   *p;
1146         char   *end;
1147
1148         static const struct {
1149                 const char *name;
1150                 uint32_t *flag;
1151         } options[] = {
1152                 { "extended", &aic79xx_extended },
1153                 { "no_reset", &aic79xx_no_reset },
1154                 { "verbose", &aic79xx_verbose },
1155                 { "allow_memio", &aic79xx_allow_memio},
1156 #ifdef AHD_DEBUG
1157                 { "debug", &ahd_debug },
1158 #endif
1159                 { "periodic_otag", &aic79xx_periodic_otag },
1160                 { "pci_parity", &aic79xx_pci_parity },
1161                 { "seltime", &aic79xx_seltime },
1162                 { "tag_info", NULL },
1163                 { "global_tag_depth", NULL},
1164                 { "slewrate", NULL },
1165                 { "precomp", NULL },
1166                 { "amplitude", NULL },
1167                 { "slowcrc", &aic79xx_slowcrc },
1168         };
1169
1170         end = strchr(s, '\0');
1171
1172         /*
1173          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1174          * will never be 0 in this case.
1175          */
1176         n = 0;
1177
1178         while ((p = strsep(&s, ",.")) != NULL) {
1179                 if (*p == '\0')
1180                         continue;
1181                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1182
1183                         n = strlen(options[i].name);
1184                         if (strncmp(options[i].name, p, n) == 0)
1185                                 break;
1186                 }
1187                 if (i == ARRAY_SIZE(options))
1188                         continue;
1189
1190                 if (strncmp(p, "global_tag_depth", n) == 0) {
1191                         ahd_linux_setup_tag_info_global(p + n);
1192                 } else if (strncmp(p, "tag_info", n) == 0) {
1193                         s = ahd_parse_brace_option("tag_info", p + n, end,
1194                             2, ahd_linux_setup_tag_info, 0);
1195                 } else if (strncmp(p, "slewrate", n) == 0) {
1196                         s = ahd_parse_brace_option("slewrate",
1197                             p + n, end, 1, ahd_linux_setup_iocell_info,
1198                             AIC79XX_SLEWRATE_INDEX);
1199                 } else if (strncmp(p, "precomp", n) == 0) {
1200                         s = ahd_parse_brace_option("precomp",
1201                             p + n, end, 1, ahd_linux_setup_iocell_info,
1202                             AIC79XX_PRECOMP_INDEX);
1203                 } else if (strncmp(p, "amplitude", n) == 0) {
1204                         s = ahd_parse_brace_option("amplitude",
1205                             p + n, end, 1, ahd_linux_setup_iocell_info,
1206                             AIC79XX_AMPLITUDE_INDEX);
1207                 } else if (p[n] == ':') {
1208                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1209                 } else if (!strncmp(p, "verbose", n)) {
1210                         *(options[i].flag) = 1;
1211                 } else {
1212                         *(options[i].flag) ^= 0xFFFFFFFF;
1213                 }
1214         }
1215         return 1;
1216 }
1217
1218 __setup("aic79xx=", aic79xx_setup);
1219
1220 uint32_t aic79xx_verbose;
1221
1222 int
1223 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
1224 {
1225         char    buf[80];
1226         struct  Scsi_Host *host;
1227         char    *new_name;
1228         u_long  s;
1229         int     retval;
1230
1231         template->name = ahd->description;
1232         host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1233         if (host == NULL)
1234                 return (ENOMEM);
1235
1236         *((struct ahd_softc **)host->hostdata) = ahd;
1237         ahd->platform_data->host = host;
1238         host->can_queue = AHD_MAX_QUEUE;
1239         host->cmd_per_lun = 2;
1240         host->sg_tablesize = AHD_NSEG;
1241         host->this_id = ahd->our_id;
1242         host->irq = ahd->platform_data->irq;
1243         host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1244         host->max_lun = AHD_NUM_LUNS;
1245         host->max_channel = 0;
1246         host->sg_tablesize = AHD_NSEG;
1247         ahd_lock(ahd, &s);
1248         ahd_set_unit(ahd, ahd_linux_unit++);
1249         ahd_unlock(ahd, &s);
1250         sprintf(buf, "scsi%d", host->host_no);
1251         new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1252         if (new_name != NULL) {
1253                 strcpy(new_name, buf);
1254                 ahd_set_name(ahd, new_name);
1255         }
1256         host->unique_id = ahd->unit;
1257         ahd_linux_initialize_scsi_bus(ahd);
1258         ahd_intr_enable(ahd, TRUE);
1259
1260         host->transportt = ahd_linux_transport_template;
1261
1262         retval = scsi_add_host(host, &ahd->dev_softc->dev);
1263         if (retval) {
1264                 printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
1265                 scsi_host_put(host);
1266                 return retval;
1267         }
1268
1269         scsi_scan_host(host);
1270         return 0;
1271 }
1272
1273 /*
1274  * Place the SCSI bus into a known state by either resetting it,
1275  * or forcing transfer negotiations on the next command to any
1276  * target.
1277  */
1278 static void
1279 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1280 {
1281         u_int target_id;
1282         u_int numtarg;
1283         unsigned long s;
1284
1285         target_id = 0;
1286         numtarg = 0;
1287
1288         if (aic79xx_no_reset != 0)
1289                 ahd->flags &= ~AHD_RESET_BUS_A;
1290
1291         if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1292                 ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1293         else
1294                 numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1295
1296         ahd_lock(ahd, &s);
1297
1298         /*
1299          * Force negotiation to async for all targets that
1300          * will not see an initial bus reset.
1301          */
1302         for (; target_id < numtarg; target_id++) {
1303                 struct ahd_devinfo devinfo;
1304                 struct ahd_initiator_tinfo *tinfo;
1305                 struct ahd_tmode_tstate *tstate;
1306
1307                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1308                                             target_id, &tstate);
1309                 ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1310                                     CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1311                 ahd_update_neg_request(ahd, &devinfo, tstate,
1312                                        tinfo, AHD_NEG_ALWAYS);
1313         }
1314         ahd_unlock(ahd, &s);
1315         /* Give the bus some time to recover */
1316         if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1317                 ahd_freeze_simq(ahd);
1318                 msleep(AIC79XX_RESET_DELAY);
1319                 ahd_release_simq(ahd);
1320         }
1321 }
1322
1323 int
1324 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1325 {
1326         ahd->platform_data =
1327             kmalloc(sizeof(struct ahd_platform_data), GFP_ATOMIC);
1328         if (ahd->platform_data == NULL)
1329                 return (ENOMEM);
1330         memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
1331         ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1332         ahd_lockinit(ahd);
1333         ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1334         return (0);
1335 }
1336
1337 void
1338 ahd_platform_free(struct ahd_softc *ahd)
1339 {
1340         struct scsi_target *starget;
1341         int i;
1342
1343         if (ahd->platform_data != NULL) {
1344                 /* destroy all of the device and target objects */
1345                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
1346                         starget = ahd->platform_data->starget[i];
1347                         if (starget != NULL) {
1348                                 ahd->platform_data->starget[i] = NULL;
1349                         }
1350                 }
1351
1352                 if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1353                         free_irq(ahd->platform_data->irq, ahd);
1354                 if (ahd->tags[0] == BUS_SPACE_PIO
1355                  && ahd->bshs[0].ioport != 0)
1356                         release_region(ahd->bshs[0].ioport, 256);
1357                 if (ahd->tags[1] == BUS_SPACE_PIO
1358                  && ahd->bshs[1].ioport != 0)
1359                         release_region(ahd->bshs[1].ioport, 256);
1360                 if (ahd->tags[0] == BUS_SPACE_MEMIO
1361                  && ahd->bshs[0].maddr != NULL) {
1362                         iounmap(ahd->bshs[0].maddr);
1363                         release_mem_region(ahd->platform_data->mem_busaddr,
1364                                            0x1000);
1365                 }
1366                 if (ahd->platform_data->host)
1367                         scsi_host_put(ahd->platform_data->host);
1368
1369                 kfree(ahd->platform_data);
1370         }
1371 }
1372
1373 void
1374 ahd_platform_init(struct ahd_softc *ahd)
1375 {
1376         /*
1377          * Lookup and commit any modified IO Cell options.
1378          */
1379         if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
1380                 const struct ahd_linux_iocell_opts *iocell_opts;
1381
1382                 iocell_opts = &aic79xx_iocell_info[ahd->unit];
1383                 if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1384                         AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1385                 if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1386                         AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1387                 if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1388                         AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1389         }
1390
1391 }
1392
1393 void
1394 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1395 {
1396         ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1397                                 SCB_GET_CHANNEL(ahd, scb),
1398                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1399                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1400 }
1401
1402 void
1403 ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
1404                       struct ahd_devinfo *devinfo, ahd_queue_alg alg)
1405 {
1406         struct ahd_linux_device *dev;
1407         int was_queuing;
1408         int now_queuing;
1409
1410         if (sdev == NULL)
1411                 return;
1412
1413         dev = scsi_transport_device_data(sdev);
1414
1415         if (dev == NULL)
1416                 return;
1417         was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1418         switch (alg) {
1419         default:
1420         case AHD_QUEUE_NONE:
1421                 now_queuing = 0;
1422                 break; 
1423         case AHD_QUEUE_BASIC:
1424                 now_queuing = AHD_DEV_Q_BASIC;
1425                 break;
1426         case AHD_QUEUE_TAGGED:
1427                 now_queuing = AHD_DEV_Q_TAGGED;
1428                 break;
1429         }
1430         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1431          && (was_queuing != now_queuing)
1432          && (dev->active != 0)) {
1433                 dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1434                 dev->qfrozen++;
1435         }
1436
1437         dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1438         if (now_queuing) {
1439                 u_int usertags;
1440
1441                 usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1442                 if (!was_queuing) {
1443                         /*
1444                          * Start out aggressively and allow our
1445                          * dynamic queue depth algorithm to take
1446                          * care of the rest.
1447                          */
1448                         dev->maxtags = usertags;
1449                         dev->openings = dev->maxtags - dev->active;
1450                 }
1451                 if (dev->maxtags == 0) {
1452                         /*
1453                          * Queueing is disabled by the user.
1454                          */
1455                         dev->openings = 1;
1456                 } else if (alg == AHD_QUEUE_TAGGED) {
1457                         dev->flags |= AHD_DEV_Q_TAGGED;
1458                         if (aic79xx_periodic_otag != 0)
1459                                 dev->flags |= AHD_DEV_PERIODIC_OTAG;
1460                 } else
1461                         dev->flags |= AHD_DEV_Q_BASIC;
1462         } else {
1463                 /* We can only have one opening. */
1464                 dev->maxtags = 0;
1465                 dev->openings =  1 - dev->active;
1466         }
1467
1468         switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1469         case AHD_DEV_Q_BASIC:
1470                 scsi_set_tag_type(sdev, MSG_SIMPLE_TASK);
1471                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1472                 break;
1473         case AHD_DEV_Q_TAGGED:
1474                 scsi_set_tag_type(sdev, MSG_ORDERED_TASK);
1475                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1476                 break;
1477         default:
1478                 /*
1479                  * We allow the OS to queue 2 untagged transactions to
1480                  * us at any time even though we can only execute them
1481                  * serially on the controller/device.  This should
1482                  * remove some latency.
1483                  */
1484                 scsi_deactivate_tcq(sdev, 1);
1485                 break;
1486         }
1487 }
1488
1489 int
1490 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1491                         int lun, u_int tag, role_t role, uint32_t status)
1492 {
1493         return 0;
1494 }
1495
1496 static u_int
1497 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1498 {
1499         static int warned_user;
1500         u_int tags;
1501
1502         tags = 0;
1503         if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1504                 if (ahd->unit >= ARRAY_SIZE(aic79xx_tag_info)) {
1505
1506                         if (warned_user == 0) {
1507                                 printk(KERN_WARNING
1508 "aic79xx: WARNING: Insufficient tag_info instances\n"
1509 "aic79xx: for installed controllers.  Using defaults\n"
1510 "aic79xx: Please update the aic79xx_tag_info array in\n"
1511 "aic79xx: the aic79xx_osm.c source file.\n");
1512                                 warned_user++;
1513                         }
1514                         tags = AHD_MAX_QUEUE;
1515                 } else {
1516                         adapter_tag_info_t *tag_info;
1517
1518                         tag_info = &aic79xx_tag_info[ahd->unit];
1519                         tags = tag_info->tag_commands[devinfo->target_offset];
1520                         if (tags > AHD_MAX_QUEUE)
1521                                 tags = AHD_MAX_QUEUE;
1522                 }
1523         }
1524         return (tags);
1525 }
1526
1527 /*
1528  * Determines the queue depth for a given device.
1529  */
1530 static void
1531 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1532 {
1533         struct  ahd_devinfo devinfo;
1534         u_int   tags;
1535         struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1536
1537         ahd_compile_devinfo(&devinfo,
1538                             ahd->our_id,
1539                             sdev->sdev_target->id, sdev->lun,
1540                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1541                             ROLE_INITIATOR);
1542         tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1543         if (tags != 0 && sdev->tagged_supported != 0) {
1544
1545                 ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_TAGGED);
1546                 ahd_send_async(ahd, devinfo.channel, devinfo.target,
1547                                devinfo.lun, AC_TRANSFER_NEG);
1548                 ahd_print_devinfo(ahd, &devinfo);
1549                 printk("Tagged Queuing enabled.  Depth %d\n", tags);
1550         } else {
1551                 ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_NONE);
1552                 ahd_send_async(ahd, devinfo.channel, devinfo.target,
1553                                devinfo.lun, AC_TRANSFER_NEG);
1554         }
1555 }
1556
1557 static int
1558 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1559                       struct scsi_cmnd *cmd)
1560 {
1561         struct   scb *scb;
1562         struct   hardware_scb *hscb;
1563         struct   ahd_initiator_tinfo *tinfo;
1564         struct   ahd_tmode_tstate *tstate;
1565         u_int    col_idx;
1566         uint16_t mask;
1567         unsigned long flags;
1568         int nseg;
1569
1570         nseg = scsi_dma_map(cmd);
1571         if (nseg < 0)
1572                 return SCSI_MLQUEUE_HOST_BUSY;
1573
1574         ahd_lock(ahd, &flags);
1575
1576         /*
1577          * Get an scb to use.
1578          */
1579         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1580                                     cmd->device->id, &tstate);
1581         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1582          || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1583                 col_idx = AHD_NEVER_COL_IDX;
1584         } else {
1585                 col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1586                                             cmd->device->lun);
1587         }
1588         if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1589                 ahd->flags |= AHD_RESOURCE_SHORTAGE;
1590                 ahd_unlock(ahd, &flags);
1591                 scsi_dma_unmap(cmd);
1592                 return SCSI_MLQUEUE_HOST_BUSY;
1593         }
1594
1595         scb->io_ctx = cmd;
1596         scb->platform_data->dev = dev;
1597         hscb = scb->hscb;
1598         cmd->host_scribble = (char *)scb;
1599
1600         /*
1601          * Fill out basics of the HSCB.
1602          */
1603         hscb->control = 0;
1604         hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1605         hscb->lun = cmd->device->lun;
1606         scb->hscb->task_management = 0;
1607         mask = SCB_GET_TARGET_MASK(ahd, scb);
1608
1609         if ((ahd->user_discenable & mask) != 0)
1610                 hscb->control |= DISCENB;
1611
1612         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1613                 scb->flags |= SCB_PACKETIZED;
1614
1615         if ((tstate->auto_negotiate & mask) != 0) {
1616                 scb->flags |= SCB_AUTO_NEGOTIATE;
1617                 scb->hscb->control |= MK_MESSAGE;
1618         }
1619
1620         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1621                 int     msg_bytes;
1622                 uint8_t tag_msgs[2];
1623
1624                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1625                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1626                         hscb->control |= tag_msgs[0];
1627                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1628                                 dev->commands_since_idle_or_otag = 0;
1629                 } else
1630                 if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1631                  && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1632                         hscb->control |= MSG_ORDERED_TASK;
1633                         dev->commands_since_idle_or_otag = 0;
1634                 } else {
1635                         hscb->control |= MSG_SIMPLE_TASK;
1636                 }
1637         }
1638
1639         hscb->cdb_len = cmd->cmd_len;
1640         memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1641
1642         scb->platform_data->xfer_len = 0;
1643         ahd_set_residual(scb, 0);
1644         ahd_set_sense_residual(scb, 0);
1645         scb->sg_count = 0;
1646
1647         if (nseg > 0) {
1648                 void *sg = scb->sg_list;
1649                 struct scatterlist *cur_seg;
1650                 int i;
1651
1652                 scb->platform_data->xfer_len = 0;
1653
1654                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1655                         dma_addr_t addr;
1656                         bus_size_t len;
1657
1658                         addr = sg_dma_address(cur_seg);
1659                         len = sg_dma_len(cur_seg);
1660                         scb->platform_data->xfer_len += len;
1661                         sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1662                                           i == (nseg - 1));
1663                 }
1664         }
1665
1666         LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1667         dev->openings--;
1668         dev->active++;
1669         dev->commands_issued++;
1670
1671         if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1672                 dev->commands_since_idle_or_otag++;
1673         scb->flags |= SCB_ACTIVE;
1674         ahd_queue_scb(ahd, scb);
1675
1676         ahd_unlock(ahd, &flags);
1677
1678         return 0;
1679 }
1680
1681 /*
1682  * SCSI controller interrupt handler.
1683  */
1684 irqreturn_t
1685 ahd_linux_isr(int irq, void *dev_id)
1686 {
1687         struct  ahd_softc *ahd;
1688         u_long  flags;
1689         int     ours;
1690
1691         ahd = (struct ahd_softc *) dev_id;
1692         ahd_lock(ahd, &flags); 
1693         ours = ahd_intr(ahd);
1694         ahd_unlock(ahd, &flags);
1695         return IRQ_RETVAL(ours);
1696 }
1697
1698 void
1699 ahd_send_async(struct ahd_softc *ahd, char channel,
1700                u_int target, u_int lun, ac_code code)
1701 {
1702         switch (code) {
1703         case AC_TRANSFER_NEG:
1704         {
1705                 char    buf[80];
1706                 struct  scsi_target *starget;
1707                 struct  info_str info;
1708                 struct  ahd_initiator_tinfo *tinfo;
1709                 struct  ahd_tmode_tstate *tstate;
1710                 unsigned int target_ppr_options;
1711
1712                 BUG_ON(target == CAM_TARGET_WILDCARD);
1713
1714                 info.buffer = buf;
1715                 info.length = sizeof(buf);
1716                 info.offset = 0;
1717                 info.pos = 0;
1718                 tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1719                                             target, &tstate);
1720
1721                 /*
1722                  * Don't bother reporting results while
1723                  * negotiations are still pending.
1724                  */
1725                 if (tinfo->curr.period != tinfo->goal.period
1726                  || tinfo->curr.width != tinfo->goal.width
1727                  || tinfo->curr.offset != tinfo->goal.offset
1728                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1729                         if (bootverbose == 0)
1730                                 break;
1731
1732                 /*
1733                  * Don't bother reporting results that
1734                  * are identical to those last reported.
1735                  */
1736                 starget = ahd->platform_data->starget[target];
1737                 if (starget == NULL)
1738                         break;
1739
1740                 target_ppr_options =
1741                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1742                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1743                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1744                         + (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1745                         + (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1746                         + (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1747                         + (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1748                         + (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1749
1750                 if (tinfo->curr.period == spi_period(starget)
1751                     && tinfo->curr.width == spi_width(starget)
1752                     && tinfo->curr.offset == spi_offset(starget)
1753                  && tinfo->curr.ppr_options == target_ppr_options)
1754                         if (bootverbose == 0)
1755                                 break;
1756
1757                 spi_period(starget) = tinfo->curr.period;
1758                 spi_width(starget) = tinfo->curr.width;
1759                 spi_offset(starget) = tinfo->curr.offset;
1760                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1761                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1762                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1763                 spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1764                 spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1765                 spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1766                 spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1767                 spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1768                 spi_display_xfer_agreement(starget);
1769                 break;
1770         }
1771         case AC_SENT_BDR:
1772         {
1773                 WARN_ON(lun != CAM_LUN_WILDCARD);
1774                 scsi_report_device_reset(ahd->platform_data->host,
1775                                          channel - 'A', target);
1776                 break;
1777         }
1778         case AC_BUS_RESET:
1779                 if (ahd->platform_data->host != NULL) {
1780                         scsi_report_bus_reset(ahd->platform_data->host,
1781                                               channel - 'A');
1782                 }
1783                 break;
1784         default:
1785                 panic("ahd_send_async: Unexpected async event");
1786         }
1787 }
1788
1789 /*
1790  * Calls the higher level scsi done function and frees the scb.
1791  */
1792 void
1793 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1794 {
1795         struct scsi_cmnd *cmd;
1796         struct    ahd_linux_device *dev;
1797
1798         if ((scb->flags & SCB_ACTIVE) == 0) {
1799                 printk("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1800                 ahd_dump_card_state(ahd);
1801                 panic("Stopping for safety");
1802         }
1803         LIST_REMOVE(scb, pending_links);
1804         cmd = scb->io_ctx;
1805         dev = scb->platform_data->dev;
1806         dev->active--;
1807         dev->openings++;
1808         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1809                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1810                 dev->qfrozen--;
1811         }
1812         ahd_linux_unmap_scb(ahd, scb);
1813
1814         /*
1815          * Guard against stale sense data.
1816          * The Linux mid-layer assumes that sense
1817          * was retrieved anytime the first byte of
1818          * the sense buffer looks "sane".
1819          */
1820         cmd->sense_buffer[0] = 0;
1821         if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1822                 uint32_t amount_xferred;
1823
1824                 amount_xferred =
1825                     ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1826                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1827 #ifdef AHD_DEBUG
1828                         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1829                                 ahd_print_path(ahd, scb);
1830                                 printk("Set CAM_UNCOR_PARITY\n");
1831                         }
1832 #endif
1833                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1834 #ifdef AHD_REPORT_UNDERFLOWS
1835                 /*
1836                  * This code is disabled by default as some
1837                  * clients of the SCSI system do not properly
1838                  * initialize the underflow parameter.  This
1839                  * results in spurious termination of commands
1840                  * that complete as expected (e.g. underflow is
1841                  * allowed as command can return variable amounts
1842                  * of data.
1843                  */
1844                 } else if (amount_xferred < scb->io_ctx->underflow) {
1845                         u_int i;
1846
1847                         ahd_print_path(ahd, scb);
1848                         printk("CDB:");
1849                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1850                                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
1851                         printk("\n");
1852                         ahd_print_path(ahd, scb);
1853                         printk("Saw underflow (%ld of %ld bytes). "
1854                                "Treated as error\n",
1855                                 ahd_get_residual(scb),
1856                                 ahd_get_transfer_length(scb));
1857                         ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1858 #endif
1859                 } else {
1860                         ahd_set_transaction_status(scb, CAM_REQ_CMP);
1861                 }
1862         } else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1863                 ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1864         }
1865
1866         if (dev->openings == 1
1867          && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1868          && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1869                 dev->tag_success_count++;
1870         /*
1871          * Some devices deal with temporary internal resource
1872          * shortages by returning queue full.  When the queue
1873          * full occurrs, we throttle back.  Slowly try to get
1874          * back to our previous queue depth.
1875          */
1876         if ((dev->openings + dev->active) < dev->maxtags
1877          && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1878                 dev->tag_success_count = 0;
1879                 dev->openings++;
1880         }
1881
1882         if (dev->active == 0)
1883                 dev->commands_since_idle_or_otag = 0;
1884
1885         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1886                 printk("Recovery SCB completes\n");
1887                 if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1888                  || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1889                         ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1890
1891                 if (ahd->platform_data->eh_done)
1892                         complete(ahd->platform_data->eh_done);
1893         }
1894
1895         ahd_free_scb(ahd, scb);
1896         ahd_linux_queue_cmd_complete(ahd, cmd);
1897 }
1898
1899 static void
1900 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1901                              struct scsi_device *sdev, struct scb *scb)
1902 {
1903         struct  ahd_devinfo devinfo;
1904         struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1905
1906         ahd_compile_devinfo(&devinfo,
1907                             ahd->our_id,
1908                             sdev->sdev_target->id, sdev->lun,
1909                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1910                             ROLE_INITIATOR);
1911         
1912         /*
1913          * We don't currently trust the mid-layer to
1914          * properly deal with queue full or busy.  So,
1915          * when one occurs, we tell the mid-layer to
1916          * unconditionally requeue the command to us
1917          * so that we can retry it ourselves.  We also
1918          * implement our own throttling mechanism so
1919          * we don't clobber the device with too many
1920          * commands.
1921          */
1922         switch (ahd_get_scsi_status(scb)) {
1923         default:
1924                 break;
1925         case SCSI_STATUS_CHECK_COND:
1926         case SCSI_STATUS_CMD_TERMINATED:
1927         {
1928                 struct scsi_cmnd *cmd;
1929
1930                 /*
1931                  * Copy sense information to the OS's cmd
1932                  * structure if it is available.
1933                  */
1934                 cmd = scb->io_ctx;
1935                 if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1936                         struct scsi_status_iu_header *siu;
1937                         u_int sense_size;
1938                         u_int sense_offset;
1939
1940                         if (scb->flags & SCB_SENSE) {
1941                                 sense_size = min(sizeof(struct scsi_sense_data)
1942                                                - ahd_get_sense_residual(scb),
1943                                                  (u_long)SCSI_SENSE_BUFFERSIZE);
1944                                 sense_offset = 0;
1945                         } else {
1946                                 /*
1947                                  * Copy only the sense data into the provided
1948                                  * buffer.
1949                                  */
1950                                 siu = (struct scsi_status_iu_header *)
1951                                     scb->sense_data;
1952                                 sense_size = min_t(size_t,
1953                                                 scsi_4btoul(siu->sense_length),
1954                                                 SCSI_SENSE_BUFFERSIZE);
1955                                 sense_offset = SIU_SENSE_OFFSET(siu);
1956                         }
1957
1958                         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1959                         memcpy(cmd->sense_buffer,
1960                                ahd_get_sense_buf(ahd, scb)
1961                                + sense_offset, sense_size);
1962                         cmd->result |= (DRIVER_SENSE << 24);
1963
1964 #ifdef AHD_DEBUG
1965                         if (ahd_debug & AHD_SHOW_SENSE) {
1966                                 int i;
1967
1968                                 printk("Copied %d bytes of sense data at %d:",
1969                                        sense_size, sense_offset);
1970                                 for (i = 0; i < sense_size; i++) {
1971                                         if ((i & 0xF) == 0)
1972                                                 printk("\n");
1973                                         printk("0x%x ", cmd->sense_buffer[i]);
1974                                 }
1975                                 printk("\n");
1976                         }
1977 #endif
1978                 }
1979                 break;
1980         }
1981         case SCSI_STATUS_QUEUE_FULL:
1982                 /*
1983                  * By the time the core driver has returned this
1984                  * command, all other commands that were queued
1985                  * to us but not the device have been returned.
1986                  * This ensures that dev->active is equal to
1987                  * the number of commands actually queued to
1988                  * the device.
1989                  */
1990                 dev->tag_success_count = 0;
1991                 if (dev->active != 0) {
1992                         /*
1993                          * Drop our opening count to the number
1994                          * of commands currently outstanding.
1995                          */
1996                         dev->openings = 0;
1997 #ifdef AHD_DEBUG
1998                         if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1999                                 ahd_print_path(ahd, scb);
2000                                 printk("Dropping tag count to %d\n",
2001                                        dev->active);
2002                         }
2003 #endif
2004                         if (dev->active == dev->tags_on_last_queuefull) {
2005
2006                                 dev->last_queuefull_same_count++;
2007                                 /*
2008                                  * If we repeatedly see a queue full
2009                                  * at the same queue depth, this
2010                                  * device has a fixed number of tag
2011                                  * slots.  Lock in this tag depth
2012                                  * so we stop seeing queue fulls from
2013                                  * this device.
2014                                  */
2015                                 if (dev->last_queuefull_same_count
2016                                  == AHD_LOCK_TAGS_COUNT) {
2017                                         dev->maxtags = dev->active;
2018                                         ahd_print_path(ahd, scb);
2019                                         printk("Locking max tag count at %d\n",
2020                                                dev->active);
2021                                 }
2022                         } else {
2023                                 dev->tags_on_last_queuefull = dev->active;
2024                                 dev->last_queuefull_same_count = 0;
2025                         }
2026                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
2027                         ahd_set_scsi_status(scb, SCSI_STATUS_OK);
2028                         ahd_platform_set_tags(ahd, sdev, &devinfo,
2029                                      (dev->flags & AHD_DEV_Q_BASIC)
2030                                    ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
2031                         break;
2032                 }
2033                 /*
2034                  * Drop down to a single opening, and treat this
2035                  * as if the target returned BUSY SCSI status.
2036                  */
2037                 dev->openings = 1;
2038                 ahd_platform_set_tags(ahd, sdev, &devinfo,
2039                              (dev->flags & AHD_DEV_Q_BASIC)
2040                            ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
2041                 ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
2042         }
2043 }
2044
2045 static void
2046 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
2047 {
2048         int status;
2049         int new_status = DID_OK;
2050         int do_fallback = 0;
2051         int scsi_status;
2052
2053         /*
2054          * Map CAM error codes into Linux Error codes.  We
2055          * avoid the conversion so that the DV code has the
2056          * full error information available when making
2057          * state change decisions.
2058          */
2059
2060         status = ahd_cmd_get_transaction_status(cmd);
2061         switch (status) {
2062         case CAM_REQ_INPROG:
2063         case CAM_REQ_CMP:
2064                 new_status = DID_OK;
2065                 break;
2066         case CAM_AUTOSENSE_FAIL:
2067                 new_status = DID_ERROR;
2068                 /* Fallthrough */
2069         case CAM_SCSI_STATUS_ERROR:
2070                 scsi_status = ahd_cmd_get_scsi_status(cmd);
2071
2072                 switch(scsi_status) {
2073                 case SCSI_STATUS_CMD_TERMINATED:
2074                 case SCSI_STATUS_CHECK_COND:
2075                         if ((cmd->result >> 24) != DRIVER_SENSE) {
2076                                 do_fallback = 1;
2077                         } else {
2078                                 struct scsi_sense_data *sense;
2079                                 
2080                                 sense = (struct scsi_sense_data *)
2081                                         cmd->sense_buffer;
2082                                 if (sense->extra_len >= 5 &&
2083                                     (sense->add_sense_code == 0x47
2084                                      || sense->add_sense_code == 0x48))
2085                                         do_fallback = 1;
2086                         }
2087                         break;
2088                 default:
2089                         break;
2090                 }
2091                 break;
2092         case CAM_REQ_ABORTED:
2093                 new_status = DID_ABORT;
2094                 break;
2095         case CAM_BUSY:
2096                 new_status = DID_BUS_BUSY;
2097                 break;
2098         case CAM_REQ_INVALID:
2099         case CAM_PATH_INVALID:
2100                 new_status = DID_BAD_TARGET;
2101                 break;
2102         case CAM_SEL_TIMEOUT:
2103                 new_status = DID_NO_CONNECT;
2104                 break;
2105         case CAM_SCSI_BUS_RESET:
2106         case CAM_BDR_SENT:
2107                 new_status = DID_RESET;
2108                 break;
2109         case CAM_UNCOR_PARITY:
2110                 new_status = DID_PARITY;
2111                 do_fallback = 1;
2112                 break;
2113         case CAM_CMD_TIMEOUT:
2114                 new_status = DID_TIME_OUT;
2115                 do_fallback = 1;
2116                 break;
2117         case CAM_REQ_CMP_ERR:
2118         case CAM_UNEXP_BUSFREE:
2119         case CAM_DATA_RUN_ERR:
2120                 new_status = DID_ERROR;
2121                 do_fallback = 1;
2122                 break;
2123         case CAM_UA_ABORT:
2124         case CAM_NO_HBA:
2125         case CAM_SEQUENCE_FAIL:
2126         case CAM_CCB_LEN_ERR:
2127         case CAM_PROVIDE_FAIL:
2128         case CAM_REQ_TERMIO:
2129         case CAM_UNREC_HBA_ERROR:
2130         case CAM_REQ_TOO_BIG:
2131                 new_status = DID_ERROR;
2132                 break;
2133         case CAM_REQUEUE_REQ:
2134                 new_status = DID_REQUEUE;
2135                 break;
2136         default:
2137                 /* We should never get here */
2138                 new_status = DID_ERROR;
2139                 break;
2140         }
2141
2142         if (do_fallback) {
2143                 printk("%s: device overrun (status %x) on %d:%d:%d\n",
2144                        ahd_name(ahd), status, cmd->device->channel,
2145                        cmd->device->id, cmd->device->lun);
2146         }
2147
2148         ahd_cmd_set_transaction_status(cmd, new_status);
2149
2150         cmd->scsi_done(cmd);
2151 }
2152
2153 static void
2154 ahd_freeze_simq(struct ahd_softc *ahd)
2155 {
2156         scsi_block_requests(ahd->platform_data->host);
2157 }
2158
2159 static void
2160 ahd_release_simq(struct ahd_softc *ahd)
2161 {
2162         scsi_unblock_requests(ahd->platform_data->host);
2163 }
2164
2165 static int
2166 ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd)
2167 {
2168         struct ahd_softc *ahd;
2169         struct ahd_linux_device *dev;
2170         struct scb *pending_scb;
2171         u_int  saved_scbptr;
2172         u_int  active_scbptr;
2173         u_int  last_phase;
2174         u_int  saved_scsiid;
2175         u_int  cdb_byte;
2176         int    retval;
2177         int    was_paused;
2178         int    paused;
2179         int    wait;
2180         int    disconnected;
2181         ahd_mode_state saved_modes;
2182         unsigned long flags;
2183
2184         pending_scb = NULL;
2185         paused = FALSE;
2186         wait = FALSE;
2187         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
2188
2189         scmd_printk(KERN_INFO, cmd,
2190                     "Attempting to queue an ABORT message:");
2191
2192         printk("CDB:");
2193         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2194                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
2195         printk("\n");
2196
2197         ahd_lock(ahd, &flags);
2198
2199         /*
2200          * First determine if we currently own this command.
2201          * Start by searching the device queue.  If not found
2202          * there, check the pending_scb list.  If not found
2203          * at all, and the system wanted us to just abort the
2204          * command, return success.
2205          */
2206         dev = scsi_transport_device_data(cmd->device);
2207
2208         if (dev == NULL) {
2209                 /*
2210                  * No target device for this command exists,
2211                  * so we must not still own the command.
2212                  */
2213                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
2214                 retval = SUCCESS;
2215                 goto no_cmd;
2216         }
2217
2218         /*
2219          * See if we can find a matching cmd in the pending list.
2220          */
2221         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2222                 if (pending_scb->io_ctx == cmd)
2223                         break;
2224         }
2225
2226         if (pending_scb == NULL) {
2227                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2228                 goto no_cmd;
2229         }
2230
2231         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2232                 /*
2233                  * We can't queue two recovery actions using the same SCB
2234                  */
2235                 retval = FAILED;
2236                 goto  done;
2237         }
2238
2239         /*
2240          * Ensure that the card doesn't do anything
2241          * behind our back.  Also make sure that we
2242          * didn't "just" miss an interrupt that would
2243          * affect this cmd.
2244          */
2245         was_paused = ahd_is_paused(ahd);
2246         ahd_pause_and_flushwork(ahd);
2247         paused = TRUE;
2248
2249         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2250                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2251                 goto no_cmd;
2252         }
2253
2254         printk("%s: At time of recovery, card was %spaused\n",
2255                ahd_name(ahd), was_paused ? "" : "not ");
2256         ahd_dump_card_state(ahd);
2257
2258         disconnected = TRUE;
2259         if (ahd_search_qinfifo(ahd, cmd->device->id, 
2260                                cmd->device->channel + 'A',
2261                                cmd->device->lun, 
2262                                pending_scb->hscb->tag,
2263                                ROLE_INITIATOR, CAM_REQ_ABORTED,
2264                                SEARCH_COMPLETE) > 0) {
2265                 printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2266                        ahd_name(ahd), cmd->device->channel, 
2267                        cmd->device->id, cmd->device->lun);
2268                 retval = SUCCESS;
2269                 goto done;
2270         }
2271
2272         saved_modes = ahd_save_modes(ahd);
2273         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2274         last_phase = ahd_inb(ahd, LASTPHASE);
2275         saved_scbptr = ahd_get_scbptr(ahd);
2276         active_scbptr = saved_scbptr;
2277         if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2278                 struct scb *bus_scb;
2279
2280                 bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2281                 if (bus_scb == pending_scb)
2282                         disconnected = FALSE;
2283         }
2284
2285         /*
2286          * At this point, pending_scb is the scb associated with the
2287          * passed in command.  That command is currently active on the
2288          * bus or is in the disconnected state.
2289          */
2290         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
2291         if (last_phase != P_BUSFREE
2292             && SCB_GET_TAG(pending_scb) == active_scbptr) {
2293
2294                 /*
2295                  * We're active on the bus, so assert ATN
2296                  * and hope that the target responds.
2297                  */
2298                 pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2299                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2300                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
2301                 ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2302                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2303                 wait = TRUE;
2304         } else if (disconnected) {
2305
2306                 /*
2307                  * Actually re-queue this SCB in an attempt
2308                  * to select the device before it reconnects.
2309                  */
2310                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2311                 ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2312                 pending_scb->hscb->cdb_len = 0;
2313                 pending_scb->hscb->task_attribute = 0;
2314                 pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2315
2316                 if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2317                         /*
2318                          * Mark the SCB has having an outstanding
2319                          * task management function.  Should the command
2320                          * complete normally before the task management
2321                          * function can be sent, the host will be notified
2322                          * to abort our requeued SCB.
2323                          */
2324                         ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2325                                  pending_scb->hscb->task_management);
2326                 } else {
2327                         /*
2328                          * If non-packetized, set the MK_MESSAGE control
2329                          * bit indicating that we desire to send a message.
2330                          * We also set the disconnected flag since there is
2331                          * no guarantee that our SCB control byte matches
2332                          * the version on the card.  We don't want the
2333                          * sequencer to abort the command thinking an
2334                          * unsolicited reselection occurred.
2335                          */
2336                         pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2337
2338                         /*
2339                          * The sequencer will never re-reference the
2340                          * in-core SCB.  To make sure we are notified
2341                          * during reselection, set the MK_MESSAGE flag in
2342                          * the card's copy of the SCB.
2343                          */
2344                         ahd_outb(ahd, SCB_CONTROL,
2345                                  ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2346                 }
2347
2348                 /*
2349                  * Clear out any entries in the QINFIFO first
2350                  * so we are the next SCB for this target
2351                  * to run.
2352                  */
2353                 ahd_search_qinfifo(ahd, cmd->device->id,
2354                                    cmd->device->channel + 'A', cmd->device->lun,
2355                                    SCB_LIST_NULL, ROLE_INITIATOR,
2356                                    CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2357                 ahd_qinfifo_requeue_tail(ahd, pending_scb);
2358                 ahd_set_scbptr(ahd, saved_scbptr);
2359                 ahd_print_path(ahd, pending_scb);
2360                 printk("Device is disconnected, re-queuing SCB\n");
2361                 wait = TRUE;
2362         } else {
2363                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2364                 retval = FAILED;
2365                 goto done;
2366         }
2367
2368 no_cmd:
2369         /*
2370          * Our assumption is that if we don't have the command, no
2371          * recovery action was required, so we return success.  Again,
2372          * the semantics of the mid-layer recovery engine are not
2373          * well defined, so this may change in time.
2374          */
2375         retval = SUCCESS;
2376 done:
2377         if (paused)
2378                 ahd_unpause(ahd);
2379         if (wait) {
2380                 DECLARE_COMPLETION_ONSTACK(done);
2381
2382                 ahd->platform_data->eh_done = &done;
2383                 ahd_unlock(ahd, &flags);
2384
2385                 printk("%s: Recovery code sleeping\n", ahd_name(ahd));
2386                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2387                         ahd_lock(ahd, &flags);
2388                         ahd->platform_data->eh_done = NULL;
2389                         ahd_unlock(ahd, &flags);
2390                         printk("%s: Timer Expired (active %d)\n",
2391                                ahd_name(ahd), dev->active);
2392                         retval = FAILED;
2393                 }
2394                 printk("Recovery code awake\n");
2395         } else
2396                 ahd_unlock(ahd, &flags);
2397
2398         if (retval != SUCCESS)
2399                 printk("%s: Command abort returning 0x%x\n",
2400                        ahd_name(ahd), retval);
2401
2402         return retval;
2403 }
2404
2405 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2406 {
2407         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2408         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2409         struct ahd_devinfo devinfo;
2410         unsigned long flags;
2411
2412         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2413                             starget->channel + 'A', ROLE_INITIATOR);
2414         ahd_lock(ahd, &flags);
2415         ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2416         ahd_unlock(ahd, &flags);
2417 }
2418
2419 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2420 {
2421         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2422         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2423         struct ahd_tmode_tstate *tstate;
2424         struct ahd_initiator_tinfo *tinfo 
2425                 = ahd_fetch_transinfo(ahd,
2426                                       starget->channel + 'A',
2427                                       shost->this_id, starget->id, &tstate);
2428         struct ahd_devinfo devinfo;
2429         unsigned int ppr_options = tinfo->goal.ppr_options;
2430         unsigned int dt;
2431         unsigned long flags;
2432         unsigned long offset = tinfo->goal.offset;
2433
2434 #ifdef AHD_DEBUG
2435         if ((ahd_debug & AHD_SHOW_DV) != 0)
2436                 printk("%s: set period to %d\n", ahd_name(ahd), period);
2437 #endif
2438         if (offset == 0)
2439                 offset = MAX_OFFSET;
2440
2441         if (period < 8)
2442                 period = 8;
2443         if (period < 10) {
2444                 if (spi_max_width(starget)) {
2445                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2446                         if (period == 8)
2447                                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2448                 } else
2449                         period = 10;
2450         }
2451
2452         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2453
2454         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2455                             starget->channel + 'A', ROLE_INITIATOR);
2456
2457         /* all PPR requests apart from QAS require wide transfers */
2458         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2459                 if (spi_width(starget) == 0)
2460                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2461         }
2462
2463         ahd_find_syncrate(ahd, &period, &ppr_options,
2464                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2465
2466         ahd_lock(ahd, &flags);
2467         ahd_set_syncrate(ahd, &devinfo, period, offset,
2468                          ppr_options, AHD_TRANS_GOAL, FALSE);
2469         ahd_unlock(ahd, &flags);
2470 }
2471
2472 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2473 {
2474         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2475         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2476         struct ahd_tmode_tstate *tstate;
2477         struct ahd_initiator_tinfo *tinfo 
2478                 = ahd_fetch_transinfo(ahd,
2479                                       starget->channel + 'A',
2480                                       shost->this_id, starget->id, &tstate);
2481         struct ahd_devinfo devinfo;
2482         unsigned int ppr_options = 0;
2483         unsigned int period = 0;
2484         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2485         unsigned long flags;
2486
2487 #ifdef AHD_DEBUG
2488         if ((ahd_debug & AHD_SHOW_DV) != 0)
2489                 printk("%s: set offset to %d\n", ahd_name(ahd), offset);
2490 #endif
2491
2492         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2493                             starget->channel + 'A', ROLE_INITIATOR);
2494         if (offset != 0) {
2495                 period = tinfo->goal.period;
2496                 ppr_options = tinfo->goal.ppr_options;
2497                 ahd_find_syncrate(ahd, &period, &ppr_options, 
2498                                   dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2499         }
2500
2501         ahd_lock(ahd, &flags);
2502         ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2503                          AHD_TRANS_GOAL, FALSE);
2504         ahd_unlock(ahd, &flags);
2505 }
2506
2507 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
2508 {
2509         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2510         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2511         struct ahd_tmode_tstate *tstate;
2512         struct ahd_initiator_tinfo *tinfo 
2513                 = ahd_fetch_transinfo(ahd,
2514                                       starget->channel + 'A',
2515                                       shost->this_id, starget->id, &tstate);
2516         struct ahd_devinfo devinfo;
2517         unsigned int ppr_options = tinfo->goal.ppr_options
2518                 & ~MSG_EXT_PPR_DT_REQ;
2519         unsigned int period = tinfo->goal.period;
2520         unsigned int width = tinfo->goal.width;
2521         unsigned long flags;
2522
2523 #ifdef AHD_DEBUG
2524         if ((ahd_debug & AHD_SHOW_DV) != 0)
2525                 printk("%s: %s DT\n", ahd_name(ahd),
2526                        dt ? "enabling" : "disabling");
2527 #endif
2528         if (dt && spi_max_width(starget)) {
2529                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2530                 if (!width)
2531                         ahd_linux_set_width(starget, 1);
2532         } else {
2533                 if (period <= 9)
2534                         period = 10; /* If resetting DT, period must be >= 25ns */
2535                 /* IU is invalid without DT set */
2536                 ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2537         }
2538         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2539                             starget->channel + 'A', ROLE_INITIATOR);
2540         ahd_find_syncrate(ahd, &period, &ppr_options,
2541                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2542
2543         ahd_lock(ahd, &flags);
2544         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2545                          ppr_options, AHD_TRANS_GOAL, FALSE);
2546         ahd_unlock(ahd, &flags);
2547 }
2548
2549 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2550 {
2551         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2552         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2553         struct ahd_tmode_tstate *tstate;
2554         struct ahd_initiator_tinfo *tinfo 
2555                 = ahd_fetch_transinfo(ahd,
2556                                       starget->channel + 'A',
2557                                       shost->this_id, starget->id, &tstate);
2558         struct ahd_devinfo devinfo;
2559         unsigned int ppr_options = tinfo->goal.ppr_options
2560                 & ~MSG_EXT_PPR_QAS_REQ;
2561         unsigned int period = tinfo->goal.period;
2562         unsigned int dt;
2563         unsigned long flags;
2564
2565 #ifdef AHD_DEBUG
2566         if ((ahd_debug & AHD_SHOW_DV) != 0)
2567                 printk("%s: %s QAS\n", ahd_name(ahd),
2568                        qas ? "enabling" : "disabling");
2569 #endif
2570
2571         if (qas) {
2572                 ppr_options |= MSG_EXT_PPR_QAS_REQ; 
2573         }
2574
2575         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2576
2577         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2578                             starget->channel + 'A', ROLE_INITIATOR);
2579         ahd_find_syncrate(ahd, &period, &ppr_options,
2580                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2581
2582         ahd_lock(ahd, &flags);
2583         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2584                          ppr_options, AHD_TRANS_GOAL, FALSE);
2585         ahd_unlock(ahd, &flags);
2586 }
2587
2588 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2589 {
2590         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2591         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2592         struct ahd_tmode_tstate *tstate;
2593         struct ahd_initiator_tinfo *tinfo 
2594                 = ahd_fetch_transinfo(ahd,
2595                                       starget->channel + 'A',
2596                                       shost->this_id, starget->id, &tstate);
2597         struct ahd_devinfo devinfo;
2598         unsigned int ppr_options = tinfo->goal.ppr_options
2599                 & ~MSG_EXT_PPR_IU_REQ;
2600         unsigned int period = tinfo->goal.period;
2601         unsigned int dt;
2602         unsigned long flags;
2603
2604 #ifdef AHD_DEBUG
2605         if ((ahd_debug & AHD_SHOW_DV) != 0)
2606                 printk("%s: %s IU\n", ahd_name(ahd),
2607                        iu ? "enabling" : "disabling");
2608 #endif
2609
2610         if (iu && spi_max_width(starget)) {
2611                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2612                 ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2613         }
2614
2615         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2616
2617         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2618                             starget->channel + 'A', ROLE_INITIATOR);
2619         ahd_find_syncrate(ahd, &period, &ppr_options,
2620                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2621
2622         ahd_lock(ahd, &flags);
2623         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2624                          ppr_options, AHD_TRANS_GOAL, FALSE);
2625         ahd_unlock(ahd, &flags);
2626 }
2627
2628 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2629 {
2630         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2631         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2632         struct ahd_tmode_tstate *tstate;
2633         struct ahd_initiator_tinfo *tinfo 
2634                 = ahd_fetch_transinfo(ahd,
2635                                       starget->channel + 'A',
2636                                       shost->this_id, starget->id, &tstate);
2637         struct ahd_devinfo devinfo;
2638         unsigned int ppr_options = tinfo->goal.ppr_options
2639                 & ~MSG_EXT_PPR_RD_STRM;
2640         unsigned int period = tinfo->goal.period;
2641         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2642         unsigned long flags;
2643
2644 #ifdef AHD_DEBUG
2645         if ((ahd_debug & AHD_SHOW_DV) != 0)
2646                 printk("%s: %s Read Streaming\n", ahd_name(ahd),
2647                        rdstrm  ? "enabling" : "disabling");
2648 #endif
2649
2650         if (rdstrm && spi_max_width(starget))
2651                 ppr_options |= MSG_EXT_PPR_RD_STRM;
2652
2653         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2654                             starget->channel + 'A', ROLE_INITIATOR);
2655         ahd_find_syncrate(ahd, &period, &ppr_options,
2656                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2657
2658         ahd_lock(ahd, &flags);
2659         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2660                          ppr_options, AHD_TRANS_GOAL, FALSE);
2661         ahd_unlock(ahd, &flags);
2662 }
2663
2664 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2665 {
2666         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2667         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2668         struct ahd_tmode_tstate *tstate;
2669         struct ahd_initiator_tinfo *tinfo 
2670                 = ahd_fetch_transinfo(ahd,
2671                                       starget->channel + 'A',
2672                                       shost->this_id, starget->id, &tstate);
2673         struct ahd_devinfo devinfo;
2674         unsigned int ppr_options = tinfo->goal.ppr_options
2675                 & ~MSG_EXT_PPR_WR_FLOW;
2676         unsigned int period = tinfo->goal.period;
2677         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2678         unsigned long flags;
2679
2680 #ifdef AHD_DEBUG
2681         if ((ahd_debug & AHD_SHOW_DV) != 0)
2682                 printk("%s: %s Write Flow Control\n", ahd_name(ahd),
2683                        wrflow ? "enabling" : "disabling");
2684 #endif
2685
2686         if (wrflow && spi_max_width(starget))
2687                 ppr_options |= MSG_EXT_PPR_WR_FLOW;
2688
2689         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2690                             starget->channel + 'A', ROLE_INITIATOR);
2691         ahd_find_syncrate(ahd, &period, &ppr_options,
2692                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2693
2694         ahd_lock(ahd, &flags);
2695         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2696                          ppr_options, AHD_TRANS_GOAL, FALSE);
2697         ahd_unlock(ahd, &flags);
2698 }
2699
2700 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2701 {
2702         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2703         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2704         struct ahd_tmode_tstate *tstate;
2705         struct ahd_initiator_tinfo *tinfo 
2706                 = ahd_fetch_transinfo(ahd,
2707                                       starget->channel + 'A',
2708                                       shost->this_id, starget->id, &tstate);
2709         struct ahd_devinfo devinfo;
2710         unsigned int ppr_options = tinfo->goal.ppr_options
2711                 & ~MSG_EXT_PPR_RTI;
2712         unsigned int period = tinfo->goal.period;
2713         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2714         unsigned long flags;
2715
2716         if ((ahd->features & AHD_RTI) == 0) {
2717 #ifdef AHD_DEBUG
2718                 if ((ahd_debug & AHD_SHOW_DV) != 0)
2719                         printk("%s: RTI not available\n", ahd_name(ahd));
2720 #endif
2721                 return;
2722         }
2723
2724 #ifdef AHD_DEBUG
2725         if ((ahd_debug & AHD_SHOW_DV) != 0)
2726                 printk("%s: %s RTI\n", ahd_name(ahd),
2727                        rti ? "enabling" : "disabling");
2728 #endif
2729
2730         if (rti && spi_max_width(starget))
2731                 ppr_options |= MSG_EXT_PPR_RTI;
2732
2733         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2734                             starget->channel + 'A', ROLE_INITIATOR);
2735         ahd_find_syncrate(ahd, &period, &ppr_options,
2736                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2737
2738         ahd_lock(ahd, &flags);
2739         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2740                          ppr_options, AHD_TRANS_GOAL, FALSE);
2741         ahd_unlock(ahd, &flags);
2742 }
2743
2744 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2745 {
2746         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2747         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2748         struct ahd_tmode_tstate *tstate;
2749         struct ahd_initiator_tinfo *tinfo 
2750                 = ahd_fetch_transinfo(ahd,
2751                                       starget->channel + 'A',
2752                                       shost->this_id, starget->id, &tstate);
2753         struct ahd_devinfo devinfo;
2754         unsigned int ppr_options = tinfo->goal.ppr_options
2755                 & ~MSG_EXT_PPR_PCOMP_EN;
2756         unsigned int period = tinfo->goal.period;
2757         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2758         unsigned long flags;
2759
2760 #ifdef AHD_DEBUG
2761         if ((ahd_debug & AHD_SHOW_DV) != 0)
2762                 printk("%s: %s Precompensation\n", ahd_name(ahd),
2763                        pcomp ? "Enable" : "Disable");
2764 #endif
2765
2766         if (pcomp && spi_max_width(starget)) {
2767                 uint8_t precomp;
2768
2769                 if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
2770                         const struct ahd_linux_iocell_opts *iocell_opts;
2771
2772                         iocell_opts = &aic79xx_iocell_info[ahd->unit];
2773                         precomp = iocell_opts->precomp;
2774                 } else {
2775                         precomp = AIC79XX_DEFAULT_PRECOMP;
2776                 }
2777                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2778                 AHD_SET_PRECOMP(ahd, precomp);
2779         } else {
2780                 AHD_SET_PRECOMP(ahd, 0);
2781         }
2782
2783         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2784                             starget->channel + 'A', ROLE_INITIATOR);
2785         ahd_find_syncrate(ahd, &period, &ppr_options,
2786                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2787
2788         ahd_lock(ahd, &flags);
2789         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2790                          ppr_options, AHD_TRANS_GOAL, FALSE);
2791         ahd_unlock(ahd, &flags);
2792 }
2793
2794 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2795 {
2796         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2797         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2798         struct ahd_tmode_tstate *tstate;
2799         struct ahd_initiator_tinfo *tinfo 
2800                 = ahd_fetch_transinfo(ahd,
2801                                       starget->channel + 'A',
2802                                       shost->this_id, starget->id, &tstate);
2803         struct ahd_devinfo devinfo;
2804         unsigned int ppr_options = tinfo->goal.ppr_options
2805                 & ~MSG_EXT_PPR_HOLD_MCS;
2806         unsigned int period = tinfo->goal.period;
2807         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2808         unsigned long flags;
2809
2810         if (hold && spi_max_width(starget))
2811                 ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2812
2813         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2814                             starget->channel + 'A', ROLE_INITIATOR);
2815         ahd_find_syncrate(ahd, &period, &ppr_options,
2816                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2817
2818         ahd_lock(ahd, &flags);
2819         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2820                          ppr_options, AHD_TRANS_GOAL, FALSE);
2821         ahd_unlock(ahd, &flags);
2822 }
2823
2824 static void ahd_linux_get_signalling(struct Scsi_Host *shost)
2825 {
2826         struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
2827         unsigned long flags;
2828         u8 mode;
2829
2830         ahd_lock(ahd, &flags);
2831         ahd_pause(ahd);
2832         mode = ahd_inb(ahd, SBLKCTL);
2833         ahd_unpause(ahd);
2834         ahd_unlock(ahd, &flags);
2835
2836         if (mode & ENAB40)
2837                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2838         else if (mode & ENAB20)
2839                 spi_signalling(shost) = SPI_SIGNAL_SE;
2840         else
2841                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2842 }
2843
2844 static struct spi_function_template ahd_linux_transport_functions = {
2845         .set_offset     = ahd_linux_set_offset,
2846         .show_offset    = 1,
2847         .set_period     = ahd_linux_set_period,
2848         .show_period    = 1,
2849         .set_width      = ahd_linux_set_width,
2850         .show_width     = 1,
2851         .set_dt         = ahd_linux_set_dt,
2852         .show_dt        = 1,
2853         .set_iu         = ahd_linux_set_iu,
2854         .show_iu        = 1,
2855         .set_qas        = ahd_linux_set_qas,
2856         .show_qas       = 1,
2857         .set_rd_strm    = ahd_linux_set_rd_strm,
2858         .show_rd_strm   = 1,
2859         .set_wr_flow    = ahd_linux_set_wr_flow,
2860         .show_wr_flow   = 1,
2861         .set_rti        = ahd_linux_set_rti,
2862         .show_rti       = 1,
2863         .set_pcomp_en   = ahd_linux_set_pcomp_en,
2864         .show_pcomp_en  = 1,
2865         .set_hold_mcs   = ahd_linux_set_hold_mcs,
2866         .show_hold_mcs  = 1,
2867         .get_signalling = ahd_linux_get_signalling,
2868 };
2869
2870 static int __init
2871 ahd_linux_init(void)
2872 {
2873         int     error = 0;
2874
2875         /*
2876          * If we've been passed any parameters, process them now.
2877          */
2878         if (aic79xx)
2879                 aic79xx_setup(aic79xx);
2880
2881         ahd_linux_transport_template =
2882                 spi_attach_transport(&ahd_linux_transport_functions);
2883         if (!ahd_linux_transport_template)
2884                 return -ENODEV;
2885
2886         scsi_transport_reserve_device(ahd_linux_transport_template,
2887                                       sizeof(struct ahd_linux_device));
2888
2889         error = ahd_linux_pci_init();
2890         if (error)
2891                 spi_release_transport(ahd_linux_transport_template);
2892         return error;
2893 }
2894
2895 static void __exit
2896 ahd_linux_exit(void)
2897 {
2898         ahd_linux_pci_exit();
2899         spi_release_transport(ahd_linux_transport_template);
2900 }
2901
2902 module_init(ahd_linux_init);
2903 module_exit(ahd_linux_exit);