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1 /*
2  * Adaptec AIC7xxx device driver for Linux.
3  *
4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
5  *
6  * Copyright (c) 1994 John Aycock
7  *   The University of Calgary Department of Computer Science.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2, or (at your option)
12  * any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; see the file COPYING.  If not, write to
21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
22  *
23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
30  * ANSI SCSI-2 specification (draft 10c), ...
31  *
32  * --------------------------------------------------------------------------
33  *
34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
35  *
36  *  Substantially modified to include support for wide and twin bus
37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
38  *  SCB paging, and other rework of the code.
39  *
40  * --------------------------------------------------------------------------
41  * Copyright (c) 1994-2000 Justin T. Gibbs.
42  * Copyright (c) 2000-2001 Adaptec Inc.
43  * All rights reserved.
44  *
45  * Redistribution and use in source and binary forms, with or without
46  * modification, are permitted provided that the following conditions
47  * are met:
48  * 1. Redistributions of source code must retain the above copyright
49  *    notice, this list of conditions, and the following disclaimer,
50  *    without modification.
51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
52  *    substantially similar to the "NO WARRANTY" disclaimer below
53  *    ("Disclaimer") and any redistribution must be conditioned upon
54  *    including a substantially similar Disclaimer requirement for further
55  *    binary redistribution.
56  * 3. Neither the names of the above-listed copyright holders nor the names
57  *    of any contributors may be used to endorse or promote products derived
58  *    from this software without specific prior written permission.
59  *
60  * Alternatively, this software may be distributed under the terms of the
61  * GNU General Public License ("GPL") version 2 as published by the Free
62  * Software Foundation.
63  *
64  * NO WARRANTY
65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
75  * POSSIBILITY OF SUCH DAMAGES.
76  *
77  *---------------------------------------------------------------------------
78  *
79  *  Thanks also go to (in alphabetical order) the following:
80  *
81  *    Rory Bolt     - Sequencer bug fixes
82  *    Jay Estabrook - Initial DEC Alpha support
83  *    Doug Ledford  - Much needed abort/reset bug fixes
84  *    Kai Makisara  - DMAing of SCBs
85  *
86  *  A Boot time option was also added for not resetting the scsi bus.
87  *
88  *    Form:  aic7xxx=extended
89  *           aic7xxx=no_reset
90  *           aic7xxx=verbose
91  *
92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
93  *
94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
95  */
96
97 /*
98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
99  *
100  * Copyright (c) 1997-1999 Doug Ledford
101  *
102  * These changes are released under the same licensing terms as the FreeBSD
103  * driver written by Justin Gibbs.  Please see his Copyright notice above
104  * for the exact terms and conditions covering my changes as well as the
105  * warranty statement.
106  *
107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
108  * but are not limited to:
109  *
110  *  1: Import of the latest FreeBSD sequencer code for this driver
111  *  2: Modification of kernel code to accommodate different sequencer semantics
112  *  3: Extensive changes throughout kernel portion of driver to improve
113  *     abort/reset processing and error hanndling
114  *  4: Other work contributed by various people on the Internet
115  *  5: Changes to printk information and verbosity selection code
116  *  6: General reliability related changes, especially in IRQ management
117  *  7: Modifications to the default probe/attach order for supported cards
118  *  8: SMP friendliness has been improved
119  *
120  */
121
122 #include "aic7xxx_osm.h"
123 #include "aic7xxx_inline.h"
124 #include <scsi/scsicam.h>
125 #include <scsi/scsi_transport.h>
126 #include <scsi/scsi_transport_spi.h>
127
128 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
129
130 /*
131  * Include aiclib.c as part of our
132  * "module dependencies are hard" work around.
133  */
134 #include "aiclib.c"
135
136 #include <linux/init.h>         /* __setup */
137 #include <linux/mm.h>           /* For fetching system memory size */
138 #include <linux/blkdev.h>               /* For block_size() */
139 #include <linux/delay.h>        /* For ssleep/msleep */
140
141 /*
142  * Lock protecting manipulation of the ahc softc list.
143  */
144 spinlock_t ahc_list_spinlock;
145
146 /*
147  * Set this to the delay in seconds after SCSI bus reset.
148  * Note, we honor this only for the initial bus reset.
149  * The scsi error recovery code performs its own bus settle
150  * delay handling for error recovery actions.
151  */
152 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
153 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
154 #else
155 #define AIC7XXX_RESET_DELAY 5000
156 #endif
157
158 /*
159  * Control collection of SCSI transfer statistics for the /proc filesystem.
160  *
161  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
162  * NOTE: This does affect performance since it has to maintain statistics.
163  */
164 #ifdef CONFIG_AIC7XXX_PROC_STATS
165 #define AIC7XXX_PROC_STATS
166 #endif
167
168 /*
169  * To change the default number of tagged transactions allowed per-device,
170  * add a line to the lilo.conf file like:
171  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
172  * which will result in the first four devices on the first two
173  * controllers being set to a tagged queue depth of 32.
174  *
175  * The tag_commands is an array of 16 to allow for wide and twin adapters.
176  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
177  * for channel 1.
178  */
179 typedef struct {
180         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
181 } adapter_tag_info_t;
182
183 /*
184  * Modify this as you see fit for your system.
185  *
186  * 0                    tagged queuing disabled
187  * 1 <= n <= 253        n == max tags ever dispatched.
188  *
189  * The driver will throttle the number of commands dispatched to a
190  * device if it returns queue full.  For devices with a fixed maximum
191  * queue depth, the driver will eventually determine this depth and
192  * lock it in (a console message is printed to indicate that a lock
193  * has occurred).  On some devices, queue full is returned for a temporary
194  * resource shortage.  These devices will return queue full at varying
195  * depths.  The driver will throttle back when the queue fulls occur and
196  * attempt to slowly increase the depth over time as the device recovers
197  * from the resource shortage.
198  *
199  * In this example, the first line will disable tagged queueing for all
200  * the devices on the first probed aic7xxx adapter.
201  *
202  * The second line enables tagged queueing with 4 commands/LUN for IDs
203  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
204  * driver to attempt to use up to 64 tags for ID 1.
205  *
206  * The third line is the same as the first line.
207  *
208  * The fourth line disables tagged queueing for devices 0 and 3.  It
209  * enables tagged queueing for the other IDs, with 16 commands/LUN
210  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
211  * IDs 2, 5-7, and 9-15.
212  */
213
214 /*
215  * NOTE: The below structure is for reference only, the actual structure
216  *       to modify in order to change things is just below this comment block.
217 adapter_tag_info_t aic7xxx_tag_info[] =
218 {
219         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
220         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
221         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
222         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
223 };
224 */
225
226 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
227 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
228 #else
229 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
230 #endif
231
232 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
233         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
234         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
235         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
236         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
237         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
238         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
239         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
240         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
241 }
242
243 /*
244  * By default, use the number of commands specified by
245  * the users kernel configuration.
246  */
247 static adapter_tag_info_t aic7xxx_tag_info[] =
248 {
249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
252         {AIC7XXX_CONFIGED_TAG_COMMANDS},
253         {AIC7XXX_CONFIGED_TAG_COMMANDS},
254         {AIC7XXX_CONFIGED_TAG_COMMANDS},
255         {AIC7XXX_CONFIGED_TAG_COMMANDS},
256         {AIC7XXX_CONFIGED_TAG_COMMANDS},
257         {AIC7XXX_CONFIGED_TAG_COMMANDS},
258         {AIC7XXX_CONFIGED_TAG_COMMANDS},
259         {AIC7XXX_CONFIGED_TAG_COMMANDS},
260         {AIC7XXX_CONFIGED_TAG_COMMANDS},
261         {AIC7XXX_CONFIGED_TAG_COMMANDS},
262         {AIC7XXX_CONFIGED_TAG_COMMANDS},
263         {AIC7XXX_CONFIGED_TAG_COMMANDS},
264         {AIC7XXX_CONFIGED_TAG_COMMANDS}
265 };
266
267 /*
268  * There should be a specific return value for this in scsi.h, but
269  * it seems that most drivers ignore it.
270  */
271 #define DID_UNDERFLOW   DID_ERROR
272
273 void
274 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
275 {
276         printk("(scsi%d:%c:%d:%d): ",
277                ahc->platform_data->host->host_no,
278                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
279                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
280                scb != NULL ? SCB_GET_LUN(scb) : -1);
281 }
282
283 /*
284  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
285  *       cards in the system.  This should be fixed.  Exceptions to this
286  *       rule are noted in the comments.
287  */
288
289 /*
290  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
291  * has no effect on any later resets that might occur due to things like
292  * SCSI bus timeouts.
293  */
294 static uint32_t aic7xxx_no_reset;
295
296 /*
297  * Certain PCI motherboards will scan PCI devices from highest to lowest,
298  * others scan from lowest to highest, and they tend to do all kinds of
299  * strange things when they come into contact with PCI bridge chips.  The
300  * net result of all this is that the PCI card that is actually used to boot
301  * the machine is very hard to detect.  Most motherboards go from lowest
302  * PCI slot number to highest, and the first SCSI controller found is the
303  * one you boot from.  The only exceptions to this are when a controller
304  * has its BIOS disabled.  So, we by default sort all of our SCSI controllers
305  * from lowest PCI slot number to highest PCI slot number.  We also force
306  * all controllers with their BIOS disabled to the end of the list.  This
307  * works on *almost* all computers.  Where it doesn't work, we have this
308  * option.  Setting this option to non-0 will reverse the order of the sort
309  * to highest first, then lowest, but will still leave cards with their BIOS
310  * disabled at the very end.  That should fix everyone up unless there are
311  * really strange cirumstances.
312  */
313 static uint32_t aic7xxx_reverse_scan;
314
315 /*
316  * Should we force EXTENDED translation on a controller.
317  *     0 == Use whatever is in the SEEPROM or default to off
318  *     1 == Use whatever is in the SEEPROM or default to on
319  */
320 static uint32_t aic7xxx_extended;
321
322 /*
323  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
324  * dubious at best.  To my knowledge, this option has never actually
325  * solved a PCI parity problem, but on certain machines with broken PCI
326  * chipset configurations where stray PCI transactions with bad parity are
327  * the norm rather than the exception, the error messages can be overwelming.
328  * It's included in the driver for completeness.
329  *   0     = Shut off PCI parity check
330  *   non-0 = reverse polarity pci parity checking
331  */
332 static uint32_t aic7xxx_pci_parity = ~0;
333
334 /*
335  * Certain newer motherboards have put new PCI based devices into the
336  * IO spaces that used to typically be occupied by VLB or EISA cards.
337  * This overlap can cause these newer motherboards to lock up when scanned
338  * for older EISA and VLB devices.  Setting this option to non-0 will
339  * cause the driver to skip scanning for any VLB or EISA controllers and
340  * only support the PCI controllers.  NOTE: this means that if the kernel
341  * os compiled with PCI support disabled, then setting this to non-0
342  * would result in never finding any devices :)
343  */
344 #ifndef CONFIG_AIC7XXX_PROBE_EISA_VL
345 uint32_t aic7xxx_probe_eisa_vl;
346 #else
347 uint32_t aic7xxx_probe_eisa_vl = ~0;
348 #endif
349
350 /*
351  * There are lots of broken chipsets in the world.  Some of them will
352  * violate the PCI spec when we issue byte sized memory writes to our
353  * controller.  I/O mapped register access, if allowed by the given
354  * platform, will work in almost all cases.
355  */
356 uint32_t aic7xxx_allow_memio = ~0;
357
358 /*
359  * aic7xxx_detect() has been run, so register all device arrivals
360  * immediately with the system rather than deferring to the sorted
361  * attachment performed by aic7xxx_detect().
362  */
363 int aic7xxx_detect_complete;
364
365 /*
366  * So that we can set how long each device is given as a selection timeout.
367  * The table of values goes like this:
368  *   0 - 256ms
369  *   1 - 128ms
370  *   2 - 64ms
371  *   3 - 32ms
372  * We default to 256ms because some older devices need a longer time
373  * to respond to initial selection.
374  */
375 static uint32_t aic7xxx_seltime;
376
377 /*
378  * Certain devices do not perform any aging on commands.  Should the
379  * device be saturated by commands in one portion of the disk, it is
380  * possible for transactions on far away sectors to never be serviced.
381  * To handle these devices, we can periodically send an ordered tag to
382  * force all outstanding transactions to be serviced prior to a new
383  * transaction.
384  */
385 uint32_t aic7xxx_periodic_otag;
386
387 /*
388  * Module information and settable options.
389  */
390 static char *aic7xxx = NULL;
391
392 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
393 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
394 MODULE_LICENSE("Dual BSD/GPL");
395 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
396 module_param(aic7xxx, charp, 0444);
397 MODULE_PARM_DESC(aic7xxx,
398 "period delimited, options string.\n"
399 "       verbose                 Enable verbose/diagnostic logging\n"
400 "       allow_memio             Allow device registers to be memory mapped\n"
401 "       debug                   Bitmask of debug values to enable\n"
402 "       no_probe                Toggle EISA/VLB controller probing\n"
403 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
404 "       no_reset                Supress initial bus resets\n"
405 "       extended                Enable extended geometry on all controllers\n"
406 "       periodic_otag           Send an ordered tagged transaction\n"
407 "                               periodically to prevent tag starvation.\n"
408 "                               This may be required by some older disk\n"
409 "                               drives or RAID arrays.\n"
410 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
411 "       tag_info:<tag_str>      Set per-target tag depth\n"
412 "       global_tag_depth:<int>  Global tag depth for every target\n"
413 "                               on every bus\n"
414 "       seltime:<int>           Selection Timeout\n"
415 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
416 "\n"
417 "       Sample /etc/modprobe.conf line:\n"
418 "               Toggle EISA/VLB probing\n"
419 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
420 "               Shorten the selection timeout to 128ms\n"
421 "\n"
422 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
423 );
424
425 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
426                                          struct ahc_linux_device *,
427                                          struct scb *);
428 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
429                                          Scsi_Cmnd *cmd);
430 static void ahc_linux_sem_timeout(u_long arg);
431 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
432 static void ahc_linux_release_simq(u_long arg);
433 static void ahc_linux_dev_timed_unfreeze(u_long arg);
434 static int  ahc_linux_queue_recovery_cmd(Scsi_Cmnd *cmd, scb_flag flag);
435 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
436 static void ahc_linux_thread_run_complete_queue(struct ahc_softc *ahc);
437 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
438                                      struct ahc_devinfo *devinfo);
439 static void ahc_linux_device_queue_depth(struct ahc_softc *ahc,
440                                          struct ahc_linux_device *dev);
441 static struct ahc_linux_target* ahc_linux_alloc_target(struct ahc_softc*,
442                                                        u_int, u_int);
443 static void                     ahc_linux_free_target(struct ahc_softc*,
444                                                       struct ahc_linux_target*);
445 static struct ahc_linux_device* ahc_linux_alloc_device(struct ahc_softc*,
446                                                        struct ahc_linux_target*,
447                                                        u_int);
448 static void                     ahc_linux_free_device(struct ahc_softc*,
449                                                       struct ahc_linux_device*);
450 static int ahc_linux_run_command(struct ahc_softc*,
451                                  struct ahc_linux_device *,
452                                  struct scsi_cmnd *);
453 static void ahc_linux_setup_tag_info_global(char *p);
454 static aic_option_callback_t ahc_linux_setup_tag_info;
455 static int  aic7xxx_setup(char *s);
456 static int  ahc_linux_next_unit(void);
457 static struct ahc_cmd *ahc_linux_run_complete_queue(struct ahc_softc *ahc);
458
459 /********************************* Inlines ************************************/
460 static __inline struct ahc_linux_device*
461                      ahc_linux_get_device(struct ahc_softc *ahc, u_int channel,
462                                           u_int target, u_int lun, int alloc);
463 static __inline void ahc_schedule_completeq(struct ahc_softc *ahc);
464 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
465
466 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
467                                       struct ahc_dma_seg *sg,
468                                       dma_addr_t addr, bus_size_t len);
469
470 static __inline void
471 ahc_schedule_completeq(struct ahc_softc *ahc)
472 {
473         if ((ahc->platform_data->flags & AHC_RUN_CMPLT_Q_TIMER) == 0) {
474                 ahc->platform_data->flags |= AHC_RUN_CMPLT_Q_TIMER;
475                 ahc->platform_data->completeq_timer.expires = jiffies;
476                 add_timer(&ahc->platform_data->completeq_timer);
477         }
478 }
479
480 static __inline struct ahc_linux_device*
481 ahc_linux_get_device(struct ahc_softc *ahc, u_int channel, u_int target,
482                      u_int lun, int alloc)
483 {
484         struct ahc_linux_target *targ;
485         struct ahc_linux_device *dev;
486         u_int target_offset;
487
488         target_offset = target;
489         if (channel != 0)
490                 target_offset += 8;
491         targ = ahc->platform_data->targets[target_offset];
492         if (targ == NULL) {
493                 if (alloc != 0) {
494                         targ = ahc_linux_alloc_target(ahc, channel, target);
495                         if (targ == NULL)
496                                 return (NULL);
497                 } else
498                         return (NULL);
499         }
500         dev = targ->devices[lun];
501         if (dev == NULL && alloc != 0)
502                 dev = ahc_linux_alloc_device(ahc, targ, lun);
503         return (dev);
504 }
505
506 #define AHC_LINUX_MAX_RETURNED_ERRORS 4
507 static struct ahc_cmd *
508 ahc_linux_run_complete_queue(struct ahc_softc *ahc)
509 {
510         struct  ahc_cmd *acmd;
511         int     with_errors;
512
513         with_errors = 0;
514         while ((acmd = TAILQ_FIRST(&ahc->platform_data->completeq)) != NULL) {
515                 Scsi_Cmnd *cmd;
516
517                 if (with_errors > AHC_LINUX_MAX_RETURNED_ERRORS) {
518                         /*
519                          * Linux uses stack recursion to requeue
520                          * commands that need to be retried.  Avoid
521                          * blowing out the stack by "spoon feeding"
522                          * commands that completed with error back
523                          * the operating system in case they are going
524                          * to be retried. "ick"
525                          */
526                         ahc_schedule_completeq(ahc);
527                         break;
528                 }
529                 TAILQ_REMOVE(&ahc->platform_data->completeq,
530                              acmd, acmd_links.tqe);
531                 cmd = &acmd_scsi_cmd(acmd);
532                 cmd->host_scribble = NULL;
533                 if (ahc_cmd_get_transaction_status(cmd) != DID_OK
534                  || (cmd->result & 0xFF) != SCSI_STATUS_OK)
535                         with_errors++;
536
537                 cmd->scsi_done(cmd);
538         }
539         return (acmd);
540 }
541
542 static __inline void
543 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
544 {
545         Scsi_Cmnd *cmd;
546
547         cmd = scb->io_ctx;
548         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
549         if (cmd->use_sg != 0) {
550                 struct scatterlist *sg;
551
552                 sg = (struct scatterlist *)cmd->request_buffer;
553                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
554                              cmd->sc_data_direction);
555         } else if (cmd->request_bufflen != 0) {
556                 pci_unmap_single(ahc->dev_softc,
557                                  scb->platform_data->buf_busaddr,
558                                  cmd->request_bufflen,
559                                  cmd->sc_data_direction);
560         }
561 }
562
563 static __inline int
564 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
565                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
566 {
567         int      consumed;
568
569         if ((scb->sg_count + 1) > AHC_NSEG)
570                 panic("Too few segs for dma mapping.  "
571                       "Increase AHC_NSEG\n");
572
573         consumed = 1;
574         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
575         scb->platform_data->xfer_len += len;
576
577         if (sizeof(dma_addr_t) > 4
578          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
579                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
580
581         sg->len = ahc_htole32(len);
582         return (consumed);
583 }
584
585 /************************  Host template entry points *************************/
586 static int         ahc_linux_detect(Scsi_Host_Template *);
587 static int         ahc_linux_queue(Scsi_Cmnd *, void (*)(Scsi_Cmnd *));
588 static const char *ahc_linux_info(struct Scsi_Host *);
589 static int         ahc_linux_slave_alloc(Scsi_Device *);
590 static int         ahc_linux_slave_configure(Scsi_Device *);
591 static void        ahc_linux_slave_destroy(Scsi_Device *);
592 #if defined(__i386__)
593 static int         ahc_linux_biosparam(struct scsi_device*,
594                                        struct block_device*,
595                                        sector_t, int[]);
596 #endif
597 static int         ahc_linux_bus_reset(Scsi_Cmnd *);
598 static int         ahc_linux_dev_reset(Scsi_Cmnd *);
599 static int         ahc_linux_abort(Scsi_Cmnd *);
600
601 /*
602  * Try to detect an Adaptec 7XXX controller.
603  */
604 static int
605 ahc_linux_detect(Scsi_Host_Template *template)
606 {
607         struct  ahc_softc *ahc;
608         int     found = 0;
609
610         /*
611          * Sanity checking of Linux SCSI data structures so
612          * that some of our hacks^H^H^H^H^Hassumptions aren't
613          * violated.
614          */
615         if (offsetof(struct ahc_cmd_internal, end)
616           > offsetof(struct scsi_cmnd, host_scribble)) {
617                 printf("ahc_linux_detect: SCSI data structures changed.\n");
618                 printf("ahc_linux_detect: Unable to attach\n");
619                 return (0);
620         }
621         /*
622          * If we've been passed any parameters, process them now.
623          */
624         if (aic7xxx)
625                 aic7xxx_setup(aic7xxx);
626
627         template->proc_name = "aic7xxx";
628
629         /*
630          * Initialize our softc list lock prior to
631          * probing for any adapters.
632          */
633         ahc_list_lockinit();
634
635         found = ahc_linux_pci_init();
636         if (!ahc_linux_eisa_init())
637                 found++;
638         
639         /*
640          * Register with the SCSI layer all
641          * controllers we've found.
642          */
643         TAILQ_FOREACH(ahc, &ahc_tailq, links) {
644
645                 if (ahc_linux_register_host(ahc, template) == 0)
646                         found++;
647         }
648
649         aic7xxx_detect_complete++;
650
651         return (found);
652 }
653
654 /*
655  * Return a string describing the driver.
656  */
657 static const char *
658 ahc_linux_info(struct Scsi_Host *host)
659 {
660         static char buffer[512];
661         char    ahc_info[256];
662         char   *bp;
663         struct ahc_softc *ahc;
664
665         bp = &buffer[0];
666         ahc = *(struct ahc_softc **)host->hostdata;
667         memset(bp, 0, sizeof(buffer));
668         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
669         strcat(bp, AIC7XXX_DRIVER_VERSION);
670         strcat(bp, "\n");
671         strcat(bp, "        <");
672         strcat(bp, ahc->description);
673         strcat(bp, ">\n");
674         strcat(bp, "        ");
675         ahc_controller_info(ahc, ahc_info);
676         strcat(bp, ahc_info);
677         strcat(bp, "\n");
678
679         return (bp);
680 }
681
682 /*
683  * Queue an SCB to the controller.
684  */
685 static int
686 ahc_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *))
687 {
688         struct   ahc_softc *ahc;
689         struct   ahc_linux_device *dev;
690
691         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
692
693         /*
694          * Save the callback on completion function.
695          */
696         cmd->scsi_done = scsi_done;
697
698         /*
699          * Close the race of a command that was in the process of
700          * being queued to us just as our simq was frozen.  Let
701          * DV commands through so long as we are only frozen to
702          * perform DV.
703          */
704         if (ahc->platform_data->qfrozen != 0)
705                 return SCSI_MLQUEUE_HOST_BUSY;
706
707         dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id,
708                                    cmd->device->lun, /*alloc*/TRUE);
709         BUG_ON(dev == NULL);
710
711         cmd->result = CAM_REQ_INPROG << 16;
712
713         return ahc_linux_run_command(ahc, dev, cmd);
714 }
715
716 static int
717 ahc_linux_slave_alloc(Scsi_Device *device)
718 {
719         struct  ahc_softc *ahc;
720
721         ahc = *((struct ahc_softc **)device->host->hostdata);
722         if (bootverbose)
723                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), device->id);
724         return (0);
725 }
726
727 static int
728 ahc_linux_slave_configure(Scsi_Device *device)
729 {
730         struct  ahc_softc *ahc;
731         struct  ahc_linux_device *dev;
732
733         ahc = *((struct ahc_softc **)device->host->hostdata);
734         if (bootverbose)
735                 printf("%s: Slave Configure %d\n", ahc_name(ahc), device->id);
736         /*
737          * Since Linux has attached to the device, configure
738          * it so we don't free and allocate the device
739          * structure on every command.
740          */
741         dev = ahc_linux_get_device(ahc, device->channel,
742                                    device->id, device->lun,
743                                    /*alloc*/TRUE);
744         if (dev != NULL) {
745                 dev->flags &= ~AHC_DEV_UNCONFIGURED;
746                 dev->scsi_device = device;
747                 ahc_linux_device_queue_depth(ahc, dev);
748         }
749
750         /* Initial Domain Validation */
751         if (!spi_initial_dv(device->sdev_target))
752                 spi_dv_device(device);
753
754         return (0);
755 }
756
757 static void
758 ahc_linux_slave_destroy(Scsi_Device *device)
759 {
760         struct  ahc_softc *ahc;
761         struct  ahc_linux_device *dev;
762
763         ahc = *((struct ahc_softc **)device->host->hostdata);
764         if (bootverbose)
765                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), device->id);
766         dev = ahc_linux_get_device(ahc, device->channel,
767                                    device->id, device->lun,
768                                            /*alloc*/FALSE);
769         /*
770          * Filter out "silly" deletions of real devices by only
771          * deleting devices that have had slave_configure()
772          * called on them.  All other devices that have not
773          * been configured will automatically be deleted by
774          * the refcounting process.
775          */
776         if (dev != NULL
777          && (dev->flags & AHC_DEV_SLAVE_CONFIGURED) != 0) {
778                 dev->flags |= AHC_DEV_UNCONFIGURED;
779                 if (dev->active == 0
780                  && (dev->flags & AHC_DEV_TIMER_ACTIVE) == 0)
781                         ahc_linux_free_device(ahc, dev);
782         }
783 }
784
785 #if defined(__i386__)
786 /*
787  * Return the disk geometry for the given SCSI device.
788  */
789 static int
790 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
791                     sector_t capacity, int geom[])
792 {
793         uint8_t *bh;
794         int      heads;
795         int      sectors;
796         int      cylinders;
797         int      ret;
798         int      extended;
799         struct   ahc_softc *ahc;
800         u_int    channel;
801
802         ahc = *((struct ahc_softc **)sdev->host->hostdata);
803         channel = sdev->channel;
804
805         bh = scsi_bios_ptable(bdev);
806         if (bh) {
807                 ret = scsi_partsize(bh, capacity,
808                                     &geom[2], &geom[0], &geom[1]);
809                 kfree(bh);
810                 if (ret != -1)
811                         return (ret);
812         }
813         heads = 64;
814         sectors = 32;
815         cylinders = aic_sector_div(capacity, heads, sectors);
816
817         if (aic7xxx_extended != 0)
818                 extended = 1;
819         else if (channel == 0)
820                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
821         else
822                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
823         if (extended && cylinders >= 1024) {
824                 heads = 255;
825                 sectors = 63;
826                 cylinders = aic_sector_div(capacity, heads, sectors);
827         }
828         geom[0] = heads;
829         geom[1] = sectors;
830         geom[2] = cylinders;
831         return (0);
832 }
833 #endif
834
835 /*
836  * Abort the current SCSI command(s).
837  */
838 static int
839 ahc_linux_abort(Scsi_Cmnd *cmd)
840 {
841         int error;
842
843         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
844         if (error != 0)
845                 printf("aic7xxx_abort returns 0x%x\n", error);
846         return (error);
847 }
848
849 /*
850  * Attempt to send a target reset message to the device that timed out.
851  */
852 static int
853 ahc_linux_dev_reset(Scsi_Cmnd *cmd)
854 {
855         int error;
856
857         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
858         if (error != 0)
859                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
860         return (error);
861 }
862
863 /*
864  * Reset the SCSI bus.
865  */
866 static int
867 ahc_linux_bus_reset(Scsi_Cmnd *cmd)
868 {
869         struct ahc_softc *ahc;
870         int    found;
871
872         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
873         found = ahc_reset_channel(ahc, cmd->device->channel + 'A',
874                                   /*initiate reset*/TRUE);
875         ahc_linux_run_complete_queue(ahc);
876
877         if (bootverbose)
878                 printf("%s: SCSI bus reset delivered. "
879                        "%d SCBs aborted.\n", ahc_name(ahc), found);
880
881         return SUCCESS;
882 }
883
884 Scsi_Host_Template aic7xxx_driver_template = {
885         .module                 = THIS_MODULE,
886         .name                   = "aic7xxx",
887         .proc_info              = ahc_linux_proc_info,
888         .info                   = ahc_linux_info,
889         .queuecommand           = ahc_linux_queue,
890         .eh_abort_handler       = ahc_linux_abort,
891         .eh_device_reset_handler = ahc_linux_dev_reset,
892         .eh_bus_reset_handler   = ahc_linux_bus_reset,
893 #if defined(__i386__)
894         .bios_param             = ahc_linux_biosparam,
895 #endif
896         .can_queue              = AHC_MAX_QUEUE,
897         .this_id                = -1,
898         .cmd_per_lun            = 2,
899         .use_clustering         = ENABLE_CLUSTERING,
900         .slave_alloc            = ahc_linux_slave_alloc,
901         .slave_configure        = ahc_linux_slave_configure,
902         .slave_destroy          = ahc_linux_slave_destroy,
903 };
904
905 /**************************** Tasklet Handler *********************************/
906
907 /******************************** Macros **************************************/
908 #define BUILD_SCSIID(ahc, cmd)                                              \
909         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
910         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
911         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
912
913 /******************************** Bus DMA *************************************/
914 int
915 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
916                    bus_size_t alignment, bus_size_t boundary,
917                    dma_addr_t lowaddr, dma_addr_t highaddr,
918                    bus_dma_filter_t *filter, void *filterarg,
919                    bus_size_t maxsize, int nsegments,
920                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
921 {
922         bus_dma_tag_t dmat;
923
924         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
925         if (dmat == NULL)
926                 return (ENOMEM);
927
928         /*
929          * Linux is very simplistic about DMA memory.  For now don't
930          * maintain all specification information.  Once Linux supplies
931          * better facilities for doing these operations, or the
932          * needs of this particular driver change, we might need to do
933          * more here.
934          */
935         dmat->alignment = alignment;
936         dmat->boundary = boundary;
937         dmat->maxsize = maxsize;
938         *ret_tag = dmat;
939         return (0);
940 }
941
942 void
943 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
944 {
945         free(dmat, M_DEVBUF);
946 }
947
948 int
949 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
950                  int flags, bus_dmamap_t *mapp)
951 {
952         bus_dmamap_t map;
953
954         map = malloc(sizeof(*map), M_DEVBUF, M_NOWAIT);
955         if (map == NULL)
956                 return (ENOMEM);
957         /*
958          * Although we can dma data above 4GB, our
959          * "consistent" memory is below 4GB for
960          * space efficiency reasons (only need a 4byte
961          * address).  For this reason, we have to reset
962          * our dma mask when doing allocations.
963          */
964         if (ahc->dev_softc != NULL)
965                 if (pci_set_dma_mask(ahc->dev_softc, 0xFFFFFFFF)) {
966                         printk(KERN_WARNING "aic7xxx: No suitable DMA available.\n");
967                         kfree(map);
968                         return (ENODEV);
969                 }
970         *vaddr = pci_alloc_consistent(ahc->dev_softc,
971                                       dmat->maxsize, &map->bus_addr);
972         if (ahc->dev_softc != NULL)
973                 if (pci_set_dma_mask(ahc->dev_softc,
974                                      ahc->platform_data->hw_dma_mask)) {
975                         printk(KERN_WARNING "aic7xxx: No suitable DMA available.\n");
976                         kfree(map);
977                         return (ENODEV);
978                 }
979         if (*vaddr == NULL)
980                 return (ENOMEM);
981         *mapp = map;
982         return(0);
983 }
984
985 void
986 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
987                 void* vaddr, bus_dmamap_t map)
988 {
989         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
990                             vaddr, map->bus_addr);
991 }
992
993 int
994 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
995                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
996                 void *cb_arg, int flags)
997 {
998         /*
999          * Assume for now that this will only be used during
1000          * initialization and not for per-transaction buffer mapping.
1001          */
1002         bus_dma_segment_t stack_sg;
1003
1004         stack_sg.ds_addr = map->bus_addr;
1005         stack_sg.ds_len = dmat->maxsize;
1006         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
1007         return (0);
1008 }
1009
1010 void
1011 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
1012 {
1013         /*
1014          * The map may is NULL in our < 2.3.X implementation.
1015          * Now it's 2.6.5, but just in case...
1016          */
1017         BUG_ON(map == NULL);
1018         free(map, M_DEVBUF);
1019 }
1020
1021 int
1022 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
1023 {
1024         /* Nothing to do */
1025         return (0);
1026 }
1027
1028 /********************* Platform Dependent Functions ***************************/
1029 /*
1030  * Compare "left hand" softc with "right hand" softc, returning:
1031  * < 0 - lahc has a lower priority than rahc
1032  *   0 - Softcs are equal
1033  * > 0 - lahc has a higher priority than rahc
1034  */
1035 int
1036 ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc)
1037 {
1038         int     value;
1039         int     rvalue;
1040         int     lvalue;
1041
1042         /*
1043          * Under Linux, cards are ordered as follows:
1044          *      1) VLB/EISA BIOS enabled devices sorted by BIOS address.
1045          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
1046          *      3) All remaining VLB/EISA devices sorted by ioport.
1047          *      4) All remaining PCI devices sorted by bus/slot/func.
1048          */
1049         value = (lahc->flags & AHC_BIOS_ENABLED)
1050               - (rahc->flags & AHC_BIOS_ENABLED);
1051         if (value != 0)
1052                 /* Controllers with BIOS enabled have a *higher* priority */
1053                 return (value);
1054
1055         /*
1056          * Same BIOS setting, now sort based on bus type.
1057          * EISA and VL controllers sort together.  EISA/VL
1058          * have higher priority than PCI.
1059          */
1060         rvalue = (rahc->chip & AHC_BUS_MASK);
1061         if (rvalue == AHC_VL)
1062                 rvalue = AHC_EISA;
1063         lvalue = (lahc->chip & AHC_BUS_MASK);
1064         if (lvalue == AHC_VL)
1065                 lvalue = AHC_EISA;
1066         value = rvalue - lvalue;
1067         if (value != 0)
1068                 return (value);
1069
1070         /* Still equal.  Sort by BIOS address, ioport, or bus/slot/func. */
1071         switch (rvalue) {
1072 #ifdef CONFIG_PCI
1073         case AHC_PCI:
1074         {
1075                 char primary_channel;
1076
1077                 if (aic7xxx_reverse_scan != 0)
1078                         value = ahc_get_pci_bus(lahc->dev_softc)
1079                               - ahc_get_pci_bus(rahc->dev_softc);
1080                 else
1081                         value = ahc_get_pci_bus(rahc->dev_softc)
1082                               - ahc_get_pci_bus(lahc->dev_softc);
1083                 if (value != 0)
1084                         break;
1085                 if (aic7xxx_reverse_scan != 0)
1086                         value = ahc_get_pci_slot(lahc->dev_softc)
1087                               - ahc_get_pci_slot(rahc->dev_softc);
1088                 else
1089                         value = ahc_get_pci_slot(rahc->dev_softc)
1090                               - ahc_get_pci_slot(lahc->dev_softc);
1091                 if (value != 0)
1092                         break;
1093                 /*
1094                  * On multi-function devices, the user can choose
1095                  * to have function 1 probed before function 0.
1096                  * Give whichever channel is the primary channel
1097                  * the highest priority.
1098                  */
1099                 primary_channel = (lahc->flags & AHC_PRIMARY_CHANNEL) + 'A';
1100                 value = -1;
1101                 if (lahc->channel == primary_channel)
1102                         value = 1;
1103                 break;
1104         }
1105 #endif
1106         case AHC_EISA:
1107                 if ((rahc->flags & AHC_BIOS_ENABLED) != 0) {
1108                         value = rahc->platform_data->bios_address
1109                               - lahc->platform_data->bios_address; 
1110                 } else {
1111                         value = rahc->bsh.ioport
1112                               - lahc->bsh.ioport; 
1113                 }
1114                 break;
1115         default:
1116                 panic("ahc_softc_sort: invalid bus type");
1117         }
1118         return (value);
1119 }
1120
1121 static void
1122 ahc_linux_setup_tag_info_global(char *p)
1123 {
1124         int tags, i, j;
1125
1126         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1127         printf("Setting Global Tags= %d\n", tags);
1128
1129         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
1130                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
1131                         aic7xxx_tag_info[i].tag_commands[j] = tags;
1132                 }
1133         }
1134 }
1135
1136 static void
1137 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1138 {
1139
1140         if ((instance >= 0) && (targ >= 0)
1141          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
1142          && (targ < AHC_NUM_TARGETS)) {
1143                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
1144                 if (bootverbose)
1145                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
1146         }
1147 }
1148
1149 /*
1150  * Handle Linux boot parameters. This routine allows for assigning a value
1151  * to a parameter with a ':' between the parameter and the value.
1152  * ie. aic7xxx=stpwlev:1,extended
1153  */
1154 static int
1155 aic7xxx_setup(char *s)
1156 {
1157         int     i, n;
1158         char   *p;
1159         char   *end;
1160
1161         static struct {
1162                 const char *name;
1163                 uint32_t *flag;
1164         } options[] = {
1165                 { "extended", &aic7xxx_extended },
1166                 { "no_reset", &aic7xxx_no_reset },
1167                 { "verbose", &aic7xxx_verbose },
1168                 { "allow_memio", &aic7xxx_allow_memio},
1169 #ifdef AHC_DEBUG
1170                 { "debug", &ahc_debug },
1171 #endif
1172                 { "reverse_scan", &aic7xxx_reverse_scan },
1173                 { "no_probe", &aic7xxx_probe_eisa_vl },
1174                 { "probe_eisa_vl", &aic7xxx_probe_eisa_vl },
1175                 { "periodic_otag", &aic7xxx_periodic_otag },
1176                 { "pci_parity", &aic7xxx_pci_parity },
1177                 { "seltime", &aic7xxx_seltime },
1178                 { "tag_info", NULL },
1179                 { "global_tag_depth", NULL },
1180                 { "dv", NULL }
1181         };
1182
1183         end = strchr(s, '\0');
1184
1185         /*
1186          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1187          * will never be 0 in this case.
1188          */
1189         n = 0;
1190
1191         while ((p = strsep(&s, ",.")) != NULL) {
1192                 if (*p == '\0')
1193                         continue;
1194                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1195
1196                         n = strlen(options[i].name);
1197                         if (strncmp(options[i].name, p, n) == 0)
1198                                 break;
1199                 }
1200                 if (i == NUM_ELEMENTS(options))
1201                         continue;
1202
1203                 if (strncmp(p, "global_tag_depth", n) == 0) {
1204                         ahc_linux_setup_tag_info_global(p + n);
1205                 } else if (strncmp(p, "tag_info", n) == 0) {
1206                         s = aic_parse_brace_option("tag_info", p + n, end,
1207                             2, ahc_linux_setup_tag_info, 0);
1208                 } else if (p[n] == ':') {
1209                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1210                 } else if (strncmp(p, "verbose", n) == 0) {
1211                         *(options[i].flag) = 1;
1212                 } else {
1213                         *(options[i].flag) ^= 0xFFFFFFFF;
1214                 }
1215         }
1216         return 1;
1217 }
1218
1219 __setup("aic7xxx=", aic7xxx_setup);
1220
1221 uint32_t aic7xxx_verbose;
1222
1223 int
1224 ahc_linux_register_host(struct ahc_softc *ahc, Scsi_Host_Template *template)
1225 {
1226         char     buf[80];
1227         struct   Scsi_Host *host;
1228         char    *new_name;
1229         u_long   s;
1230
1231         template->name = ahc->description;
1232         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1233         if (host == NULL)
1234                 return (ENOMEM);
1235
1236         *((struct ahc_softc **)host->hostdata) = ahc;
1237         ahc_lock(ahc, &s);
1238         scsi_assign_lock(host, &ahc->platform_data->spin_lock);
1239         ahc->platform_data->host = host;
1240         host->can_queue = AHC_MAX_QUEUE;
1241         host->cmd_per_lun = 2;
1242         /* XXX No way to communicate the ID for multiple channels */
1243         host->this_id = ahc->our_id;
1244         host->irq = ahc->platform_data->irq;
1245         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1246         host->max_lun = AHC_NUM_LUNS;
1247         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1248         host->sg_tablesize = AHC_NSEG;
1249         ahc_set_unit(ahc, ahc_linux_next_unit());
1250         sprintf(buf, "scsi%d", host->host_no);
1251         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1252         if (new_name != NULL) {
1253                 strcpy(new_name, buf);
1254                 ahc_set_name(ahc, new_name);
1255         }
1256         host->unique_id = ahc->unit;
1257         ahc_linux_initialize_scsi_bus(ahc);
1258         ahc_intr_enable(ahc, TRUE);
1259         ahc_unlock(ahc, &s);
1260
1261         host->transportt = ahc_linux_transport_template;
1262
1263         scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
1264         scsi_scan_host(host);
1265         return (0);
1266 }
1267
1268 uint64_t
1269 ahc_linux_get_memsize(void)
1270 {
1271         struct sysinfo si;
1272
1273         si_meminfo(&si);
1274         return ((uint64_t)si.totalram << PAGE_SHIFT);
1275 }
1276
1277 /*
1278  * Find the smallest available unit number to use
1279  * for a new device.  We don't just use a static
1280  * count to handle the "repeated hot-(un)plug"
1281  * scenario.
1282  */
1283 static int
1284 ahc_linux_next_unit(void)
1285 {
1286         struct ahc_softc *ahc;
1287         int unit;
1288
1289         unit = 0;
1290 retry:
1291         TAILQ_FOREACH(ahc, &ahc_tailq, links) {
1292                 if (ahc->unit == unit) {
1293                         unit++;
1294                         goto retry;
1295                 }
1296         }
1297         return (unit);
1298 }
1299
1300 /*
1301  * Place the SCSI bus into a known state by either resetting it,
1302  * or forcing transfer negotiations on the next command to any
1303  * target.
1304  */
1305 void
1306 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1307 {
1308         int i;
1309         int numtarg;
1310
1311         i = 0;
1312         numtarg = 0;
1313
1314         if (aic7xxx_no_reset != 0)
1315                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1316
1317         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1318                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1319         else
1320                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1321
1322         if ((ahc->features & AHC_TWIN) != 0) {
1323
1324                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1325                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1326                 } else {
1327                         if (numtarg == 0)
1328                                 i = 8;
1329                         numtarg += 8;
1330                 }
1331         }
1332
1333         /*
1334          * Force negotiation to async for all targets that
1335          * will not see an initial bus reset.
1336          */
1337         for (; i < numtarg; i++) {
1338                 struct ahc_devinfo devinfo;
1339                 struct ahc_initiator_tinfo *tinfo;
1340                 struct ahc_tmode_tstate *tstate;
1341                 u_int our_id;
1342                 u_int target_id;
1343                 char channel;
1344
1345                 channel = 'A';
1346                 our_id = ahc->our_id;
1347                 target_id = i;
1348                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1349                         channel = 'B';
1350                         our_id = ahc->our_id_b;
1351                         target_id = i % 8;
1352                 }
1353                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1354                                             target_id, &tstate);
1355                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1356                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1357                 ahc_update_neg_request(ahc, &devinfo, tstate,
1358                                        tinfo, AHC_NEG_ALWAYS);
1359         }
1360         /* Give the bus some time to recover */
1361         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1362                 ahc_linux_freeze_simq(ahc);
1363                 init_timer(&ahc->platform_data->reset_timer);
1364                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1365                 ahc->platform_data->reset_timer.expires =
1366                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1367                 ahc->platform_data->reset_timer.function =
1368                     ahc_linux_release_simq;
1369                 add_timer(&ahc->platform_data->reset_timer);
1370         }
1371 }
1372
1373 int
1374 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1375 {
1376
1377         ahc->platform_data =
1378             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1379         if (ahc->platform_data == NULL)
1380                 return (ENOMEM);
1381         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1382         TAILQ_INIT(&ahc->platform_data->completeq);
1383         TAILQ_INIT(&ahc->platform_data->device_runq);
1384         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1385         ahc->platform_data->hw_dma_mask = 0xFFFFFFFF;
1386         ahc_lockinit(ahc);
1387         init_timer(&ahc->platform_data->completeq_timer);
1388         ahc->platform_data->completeq_timer.data = (u_long)ahc;
1389         ahc->platform_data->completeq_timer.function =
1390             (ahc_linux_callback_t *)ahc_linux_thread_run_complete_queue;
1391         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1392         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1393         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1394         if (aic7xxx_pci_parity == 0)
1395                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1396
1397         return (0);
1398 }
1399
1400 void
1401 ahc_platform_free(struct ahc_softc *ahc)
1402 {
1403         struct ahc_linux_target *targ;
1404         struct ahc_linux_device *dev;
1405         int i, j;
1406
1407         if (ahc->platform_data != NULL) {
1408                 del_timer_sync(&ahc->platform_data->completeq_timer);
1409                 if (ahc->platform_data->host != NULL) {
1410                         scsi_remove_host(ahc->platform_data->host);
1411                         scsi_host_put(ahc->platform_data->host);
1412                 }
1413
1414                 /* destroy all of the device and target objects */
1415                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1416                         targ = ahc->platform_data->targets[i];
1417                         if (targ != NULL) {
1418                                 /* Keep target around through the loop. */
1419                                 targ->refcount++;
1420                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1421
1422                                         if (targ->devices[j] == NULL)
1423                                                 continue;
1424                                         dev = targ->devices[j];
1425                                         ahc_linux_free_device(ahc, dev);
1426                                 }
1427                                 /*
1428                                  * Forcibly free the target now that
1429                                  * all devices are gone.
1430                                  */
1431                                 ahc_linux_free_target(ahc, targ);
1432                         }
1433                 }
1434
1435                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1436                         free_irq(ahc->platform_data->irq, ahc);
1437                 if (ahc->tag == BUS_SPACE_PIO
1438                  && ahc->bsh.ioport != 0)
1439                         release_region(ahc->bsh.ioport, 256);
1440                 if (ahc->tag == BUS_SPACE_MEMIO
1441                  && ahc->bsh.maddr != NULL) {
1442                         iounmap(ahc->bsh.maddr);
1443                         release_mem_region(ahc->platform_data->mem_busaddr,
1444                                            0x1000);
1445                 }
1446
1447                 free(ahc->platform_data, M_DEVBUF);
1448         }
1449 }
1450
1451 void
1452 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1453 {
1454         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1455                                 SCB_GET_CHANNEL(ahc, scb),
1456                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1457                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1458 }
1459
1460 void
1461 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1462                       ahc_queue_alg alg)
1463 {
1464         struct ahc_linux_device *dev;
1465         int was_queuing;
1466         int now_queuing;
1467
1468         dev = ahc_linux_get_device(ahc, devinfo->channel - 'A',
1469                                    devinfo->target,
1470                                    devinfo->lun, /*alloc*/FALSE);
1471         if (dev == NULL)
1472                 return;
1473         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1474         switch (alg) {
1475         default:
1476         case AHC_QUEUE_NONE:
1477                 now_queuing = 0;
1478                 break; 
1479         case AHC_QUEUE_BASIC:
1480                 now_queuing = AHC_DEV_Q_BASIC;
1481                 break;
1482         case AHC_QUEUE_TAGGED:
1483                 now_queuing = AHC_DEV_Q_TAGGED;
1484                 break;
1485         }
1486         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1487          && (was_queuing != now_queuing)
1488          && (dev->active != 0)) {
1489                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1490                 dev->qfrozen++;
1491         }
1492
1493         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1494         if (now_queuing) {
1495                 u_int usertags;
1496
1497                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1498                 if (!was_queuing) {
1499                         /*
1500                          * Start out agressively and allow our
1501                          * dynamic queue depth algorithm to take
1502                          * care of the rest.
1503                          */
1504                         dev->maxtags = usertags;
1505                         dev->openings = dev->maxtags - dev->active;
1506                 }
1507                 if (dev->maxtags == 0) {
1508                         /*
1509                          * Queueing is disabled by the user.
1510                          */
1511                         dev->openings = 1;
1512                 } else if (alg == AHC_QUEUE_TAGGED) {
1513                         dev->flags |= AHC_DEV_Q_TAGGED;
1514                         if (aic7xxx_periodic_otag != 0)
1515                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1516                 } else
1517                         dev->flags |= AHC_DEV_Q_BASIC;
1518         } else {
1519                 /* We can only have one opening. */
1520                 dev->maxtags = 0;
1521                 dev->openings =  1 - dev->active;
1522         }
1523         if (dev->scsi_device != NULL) {
1524                 switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1525                 case AHC_DEV_Q_BASIC:
1526                         scsi_adjust_queue_depth(dev->scsi_device,
1527                                                 MSG_SIMPLE_TASK,
1528                                                 dev->openings + dev->active);
1529                         break;
1530                 case AHC_DEV_Q_TAGGED:
1531                         scsi_adjust_queue_depth(dev->scsi_device,
1532                                                 MSG_ORDERED_TASK,
1533                                                 dev->openings + dev->active);
1534                         break;
1535                 default:
1536                         /*
1537                          * We allow the OS to queue 2 untagged transactions to
1538                          * us at any time even though we can only execute them
1539                          * serially on the controller/device.  This should
1540                          * remove some latency.
1541                          */
1542                         scsi_adjust_queue_depth(dev->scsi_device,
1543                                                 /*NON-TAGGED*/0,
1544                                                 /*queue depth*/2);
1545                         break;
1546                 }
1547         }
1548 }
1549
1550 int
1551 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1552                         int lun, u_int tag, role_t role, uint32_t status)
1553 {
1554         return 0;
1555 }
1556
1557 static void
1558 ahc_linux_thread_run_complete_queue(struct ahc_softc *ahc)
1559 {
1560         u_long flags;
1561
1562         ahc_lock(ahc, &flags);
1563         del_timer(&ahc->platform_data->completeq_timer);
1564         ahc->platform_data->flags &= ~AHC_RUN_CMPLT_Q_TIMER;
1565         ahc_linux_run_complete_queue(ahc);
1566         ahc_unlock(ahc, &flags);
1567 }
1568
1569 static u_int
1570 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1571 {
1572         static int warned_user;
1573         u_int tags;
1574
1575         tags = 0;
1576         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1577                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1578                         if (warned_user == 0) {
1579
1580                                 printf(KERN_WARNING
1581 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1582 "aic7xxx: for installed controllers. Using defaults\n"
1583 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1584 "aic7xxx: the aic7xxx_osm..c source file.\n");
1585                                 warned_user++;
1586                         }
1587                         tags = AHC_MAX_QUEUE;
1588                 } else {
1589                         adapter_tag_info_t *tag_info;
1590
1591                         tag_info = &aic7xxx_tag_info[ahc->unit];
1592                         tags = tag_info->tag_commands[devinfo->target_offset];
1593                         if (tags > AHC_MAX_QUEUE)
1594                                 tags = AHC_MAX_QUEUE;
1595                 }
1596         }
1597         return (tags);
1598 }
1599
1600 /*
1601  * Determines the queue depth for a given device.
1602  */
1603 static void
1604 ahc_linux_device_queue_depth(struct ahc_softc *ahc,
1605                              struct ahc_linux_device *dev)
1606 {
1607         struct  ahc_devinfo devinfo;
1608         u_int   tags;
1609
1610         ahc_compile_devinfo(&devinfo,
1611                             dev->target->channel == 0
1612                           ? ahc->our_id : ahc->our_id_b,
1613                             dev->target->target, dev->lun,
1614                             dev->target->channel == 0 ? 'A' : 'B',
1615                             ROLE_INITIATOR);
1616         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1617         if (tags != 0
1618          && dev->scsi_device != NULL
1619          && dev->scsi_device->tagged_supported != 0) {
1620
1621                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1622                 ahc_print_devinfo(ahc, &devinfo);
1623                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1624         } else {
1625                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1626         }
1627 }
1628
1629 static int
1630 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1631                       struct scsi_cmnd *cmd)
1632 {
1633         struct   scb *scb;
1634         struct   hardware_scb *hscb;
1635         struct   ahc_initiator_tinfo *tinfo;
1636         struct   ahc_tmode_tstate *tstate;
1637         uint16_t mask;
1638         struct scb_tailq *untagged_q = NULL;
1639
1640         /*
1641          * Schedule us to run later.  The only reason we are not
1642          * running is because the whole controller Q is frozen.
1643          */
1644         if (ahc->platform_data->qfrozen != 0)
1645                 return SCSI_MLQUEUE_HOST_BUSY;
1646
1647         /*
1648          * We only allow one untagged transaction
1649          * per target in the initiator role unless
1650          * we are storing a full busy target *lun*
1651          * table in SCB space.
1652          */
1653         if (!blk_rq_tagged(cmd->request)
1654             && (ahc->features & AHC_SCB_BTT) == 0) {
1655                 int target_offset;
1656
1657                 target_offset = cmd->device->id + cmd->device->channel * 8;
1658                 untagged_q = &(ahc->untagged_queues[target_offset]);
1659                 if (!TAILQ_EMPTY(untagged_q))
1660                         /* if we're already executing an untagged command
1661                          * we're busy to another */
1662                         return SCSI_MLQUEUE_DEVICE_BUSY;
1663         }
1664
1665         /*
1666          * Get an scb to use.
1667          */
1668         if ((scb = ahc_get_scb(ahc)) == NULL) {
1669                         ahc->flags |= AHC_RESOURCE_SHORTAGE;
1670                         return SCSI_MLQUEUE_HOST_BUSY;
1671         }
1672
1673         scb->io_ctx = cmd;
1674         scb->platform_data->dev = dev;
1675         hscb = scb->hscb;
1676         cmd->host_scribble = (char *)scb;
1677
1678         /*
1679          * Fill out basics of the HSCB.
1680          */
1681         hscb->control = 0;
1682         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1683         hscb->lun = cmd->device->lun;
1684         mask = SCB_GET_TARGET_MASK(ahc, scb);
1685         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1686                                     SCB_GET_OUR_ID(scb),
1687                                     SCB_GET_TARGET(ahc, scb), &tstate);
1688         hscb->scsirate = tinfo->scsirate;
1689         hscb->scsioffset = tinfo->curr.offset;
1690         if ((tstate->ultraenb & mask) != 0)
1691                 hscb->control |= ULTRAENB;
1692         
1693         if ((ahc->user_discenable & mask) != 0)
1694                 hscb->control |= DISCENB;
1695         
1696         if ((tstate->auto_negotiate & mask) != 0) {
1697                 scb->flags |= SCB_AUTO_NEGOTIATE;
1698                 scb->hscb->control |= MK_MESSAGE;
1699         }
1700
1701         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1702                 int     msg_bytes;
1703                 uint8_t tag_msgs[2];
1704                 
1705                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1706                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1707                         hscb->control |= tag_msgs[0];
1708                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1709                                 dev->commands_since_idle_or_otag = 0;
1710                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1711                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1712                         hscb->control |= MSG_ORDERED_TASK;
1713                         dev->commands_since_idle_or_otag = 0;
1714                 } else {
1715                         hscb->control |= MSG_SIMPLE_TASK;
1716                 }
1717         }
1718
1719         hscb->cdb_len = cmd->cmd_len;
1720         if (hscb->cdb_len <= 12) {
1721                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1722         } else {
1723                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1724                 scb->flags |= SCB_CDB32_PTR;
1725         }
1726
1727         scb->platform_data->xfer_len = 0;
1728         ahc_set_residual(scb, 0);
1729         ahc_set_sense_residual(scb, 0);
1730         scb->sg_count = 0;
1731         if (cmd->use_sg != 0) {
1732                 struct  ahc_dma_seg *sg;
1733                 struct  scatterlist *cur_seg;
1734                 struct  scatterlist *end_seg;
1735                 int     nseg;
1736
1737                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1738                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1739                                   cmd->sc_data_direction);
1740                 end_seg = cur_seg + nseg;
1741                 /* Copy the segments into the SG list. */
1742                 sg = scb->sg_list;
1743                 /*
1744                  * The sg_count may be larger than nseg if
1745                  * a transfer crosses a 32bit page.
1746                  */ 
1747                 while (cur_seg < end_seg) {
1748                         dma_addr_t addr;
1749                         bus_size_t len;
1750                         int consumed;
1751
1752                         addr = sg_dma_address(cur_seg);
1753                         len = sg_dma_len(cur_seg);
1754                         consumed = ahc_linux_map_seg(ahc, scb,
1755                                                      sg, addr, len);
1756                         sg += consumed;
1757                         scb->sg_count += consumed;
1758                         cur_seg++;
1759                 }
1760                 sg--;
1761                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1762
1763                 /*
1764                  * Reset the sg list pointer.
1765                  */
1766                 scb->hscb->sgptr =
1767                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1768                 
1769                 /*
1770                  * Copy the first SG into the "current"
1771                  * data pointer area.
1772                  */
1773                 scb->hscb->dataptr = scb->sg_list->addr;
1774                 scb->hscb->datacnt = scb->sg_list->len;
1775         } else if (cmd->request_bufflen != 0) {
1776                 struct   ahc_dma_seg *sg;
1777                 dma_addr_t addr;
1778
1779                 sg = scb->sg_list;
1780                 addr = pci_map_single(ahc->dev_softc,
1781                                       cmd->request_buffer,
1782                                       cmd->request_bufflen,
1783                                       cmd->sc_data_direction);
1784                 scb->platform_data->buf_busaddr = addr;
1785                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1786                                                   sg, addr,
1787                                                   cmd->request_bufflen);
1788                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1789
1790                 /*
1791                  * Reset the sg list pointer.
1792                  */
1793                 scb->hscb->sgptr =
1794                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1795
1796                 /*
1797                  * Copy the first SG into the "current"
1798                  * data pointer area.
1799                  */
1800                 scb->hscb->dataptr = sg->addr;
1801                 scb->hscb->datacnt = sg->len;
1802         } else {
1803                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1804                 scb->hscb->dataptr = 0;
1805                 scb->hscb->datacnt = 0;
1806                 scb->sg_count = 0;
1807         }
1808
1809         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1810         dev->openings--;
1811         dev->active++;
1812         dev->commands_issued++;
1813         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1814                 dev->commands_since_idle_or_otag++;
1815         
1816         scb->flags |= SCB_ACTIVE;
1817         if (untagged_q) {
1818                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1819                 scb->flags |= SCB_UNTAGGEDQ;
1820         }
1821         ahc_queue_scb(ahc, scb);
1822         return 0;
1823 }
1824
1825 /*
1826  * SCSI controller interrupt handler.
1827  */
1828 irqreturn_t
1829 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1830 {
1831         struct  ahc_softc *ahc;
1832         u_long  flags;
1833         int     ours;
1834
1835         ahc = (struct ahc_softc *) dev_id;
1836         ahc_lock(ahc, &flags); 
1837         ours = ahc_intr(ahc);
1838         ahc_linux_run_complete_queue(ahc);
1839         ahc_unlock(ahc, &flags);
1840         return IRQ_RETVAL(ours);
1841 }
1842
1843 void
1844 ahc_platform_flushwork(struct ahc_softc *ahc)
1845 {
1846
1847         while (ahc_linux_run_complete_queue(ahc) != NULL)
1848                 ;
1849 }
1850
1851 static struct ahc_linux_target*
1852 ahc_linux_alloc_target(struct ahc_softc *ahc, u_int channel, u_int target)
1853 {
1854         struct ahc_linux_target *targ;
1855         u_int target_offset;
1856
1857         target_offset = target;
1858         if (channel != 0)
1859                 target_offset += 8;
1860
1861         targ = malloc(sizeof(*targ), M_DEVBUG, M_NOWAIT);
1862         if (targ == NULL)
1863                 return (NULL);
1864         memset(targ, 0, sizeof(*targ));
1865         targ->channel = channel;
1866         targ->target = target;
1867         targ->ahc = ahc;
1868         ahc->platform_data->targets[target_offset] = targ;
1869         return (targ);
1870 }
1871
1872 static void
1873 ahc_linux_free_target(struct ahc_softc *ahc, struct ahc_linux_target *targ)
1874 {
1875         struct ahc_devinfo devinfo;
1876         struct ahc_initiator_tinfo *tinfo;
1877         struct ahc_tmode_tstate *tstate;
1878         u_int our_id;
1879         u_int target_offset;
1880         char channel;
1881
1882         /*
1883          * Force a negotiation to async/narrow on any
1884          * future command to this device unless a bus
1885          * reset occurs between now and that command.
1886          */
1887         channel = 'A' + targ->channel;
1888         our_id = ahc->our_id;
1889         target_offset = targ->target;
1890         if (targ->channel != 0) {
1891                 target_offset += 8;
1892                 our_id = ahc->our_id_b;
1893         }
1894         tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1895                                     targ->target, &tstate);
1896         ahc_compile_devinfo(&devinfo, our_id, targ->target, CAM_LUN_WILDCARD,
1897                             channel, ROLE_INITIATOR);
1898         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
1899                          AHC_TRANS_GOAL, /*paused*/FALSE);
1900         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
1901                       AHC_TRANS_GOAL, /*paused*/FALSE);
1902         ahc_update_neg_request(ahc, &devinfo, tstate, tinfo, AHC_NEG_ALWAYS);
1903         ahc->platform_data->targets[target_offset] = NULL;
1904         free(targ, M_DEVBUF);
1905 }
1906
1907 static struct ahc_linux_device*
1908 ahc_linux_alloc_device(struct ahc_softc *ahc,
1909                  struct ahc_linux_target *targ, u_int lun)
1910 {
1911         struct ahc_linux_device *dev;
1912
1913         dev = malloc(sizeof(*dev), M_DEVBUG, M_NOWAIT);
1914         if (dev == NULL)
1915                 return (NULL);
1916         memset(dev, 0, sizeof(*dev));
1917         init_timer(&dev->timer);
1918         dev->flags = AHC_DEV_UNCONFIGURED;
1919         dev->lun = lun;
1920         dev->target = targ;
1921
1922         /*
1923          * We start out life using untagged
1924          * transactions of which we allow one.
1925          */
1926         dev->openings = 1;
1927
1928         /*
1929          * Set maxtags to 0.  This will be changed if we
1930          * later determine that we are dealing with
1931          * a tagged queuing capable device.
1932          */
1933         dev->maxtags = 0;
1934         
1935         targ->refcount++;
1936         targ->devices[lun] = dev;
1937         return (dev);
1938 }
1939
1940 static void
1941 __ahc_linux_free_device(struct ahc_softc *ahc, struct ahc_linux_device *dev)
1942 {
1943         struct ahc_linux_target *targ;
1944
1945         targ = dev->target;
1946         targ->devices[dev->lun] = NULL;
1947         free(dev, M_DEVBUF);
1948         targ->refcount--;
1949         if (targ->refcount == 0)
1950                 ahc_linux_free_target(ahc, targ);
1951 }
1952
1953 static void
1954 ahc_linux_free_device(struct ahc_softc *ahc, struct ahc_linux_device *dev)
1955 {
1956         del_timer_sync(&dev->timer);
1957         __ahc_linux_free_device(ahc, dev);
1958 }
1959
1960 void
1961 ahc_send_async(struct ahc_softc *ahc, char channel,
1962                u_int target, u_int lun, ac_code code, void *arg)
1963 {
1964         switch (code) {
1965         case AC_TRANSFER_NEG:
1966         {
1967                 char    buf[80];
1968                 struct  ahc_linux_target *targ;
1969                 struct  info_str info;
1970                 struct  ahc_initiator_tinfo *tinfo;
1971                 struct  ahc_tmode_tstate *tstate;
1972                 int     target_offset;
1973
1974                 info.buffer = buf;
1975                 info.length = sizeof(buf);
1976                 info.offset = 0;
1977                 info.pos = 0;
1978                 tinfo = ahc_fetch_transinfo(ahc, channel,
1979                                                 channel == 'A' ? ahc->our_id
1980                                                                : ahc->our_id_b,
1981                                                 target, &tstate);
1982
1983                 /*
1984                  * Don't bother reporting results while
1985                  * negotiations are still pending.
1986                  */
1987                 if (tinfo->curr.period != tinfo->goal.period
1988                  || tinfo->curr.width != tinfo->goal.width
1989                  || tinfo->curr.offset != tinfo->goal.offset
1990                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1991                         if (bootverbose == 0)
1992                                 break;
1993
1994                 /*
1995                  * Don't bother reporting results that
1996                  * are identical to those last reported.
1997                  */
1998                 target_offset = target;
1999                 if (channel == 'B')
2000                         target_offset += 8;
2001                 targ = ahc->platform_data->targets[target_offset];
2002                 if (targ == NULL)
2003                         break;
2004                 if (tinfo->curr.period == targ->last_tinfo.period
2005                  && tinfo->curr.width == targ->last_tinfo.width
2006                  && tinfo->curr.offset == targ->last_tinfo.offset
2007                  && tinfo->curr.ppr_options == targ->last_tinfo.ppr_options)
2008                         if (bootverbose == 0)
2009                                 break;
2010
2011                 targ->last_tinfo.period = tinfo->curr.period;
2012                 targ->last_tinfo.width = tinfo->curr.width;
2013                 targ->last_tinfo.offset = tinfo->curr.offset;
2014                 targ->last_tinfo.ppr_options = tinfo->curr.ppr_options;
2015
2016                 printf("(%s:%c:", ahc_name(ahc), channel);
2017                 if (target == CAM_TARGET_WILDCARD)
2018                         printf("*): ");
2019                 else
2020                         printf("%d): ", target);
2021                 ahc_format_transinfo(&info, &tinfo->curr);
2022                 if (info.pos < info.length)
2023                         *info.buffer = '\0';
2024                 else
2025                         buf[info.length - 1] = '\0';
2026                 printf("%s", buf);
2027                 break;
2028         }
2029         case AC_SENT_BDR:
2030         {
2031                 WARN_ON(lun != CAM_LUN_WILDCARD);
2032                 scsi_report_device_reset(ahc->platform_data->host,
2033                                          channel - 'A', target);
2034                 break;
2035         }
2036         case AC_BUS_RESET:
2037                 if (ahc->platform_data->host != NULL) {
2038                         scsi_report_bus_reset(ahc->platform_data->host,
2039                                               channel - 'A');
2040                 }
2041                 break;
2042         default:
2043                 panic("ahc_send_async: Unexpected async event");
2044         }
2045 }
2046
2047 /*
2048  * Calls the higher level scsi done function and frees the scb.
2049  */
2050 void
2051 ahc_done(struct ahc_softc *ahc, struct scb *scb)
2052 {
2053         Scsi_Cmnd *cmd;
2054         struct     ahc_linux_device *dev;
2055
2056         LIST_REMOVE(scb, pending_links);
2057         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
2058                 struct scb_tailq *untagged_q;
2059                 int target_offset;
2060
2061                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
2062                 untagged_q = &(ahc->untagged_queues[target_offset]);
2063                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
2064                 BUG_ON(!TAILQ_EMPTY(untagged_q));
2065         }
2066
2067         if ((scb->flags & SCB_ACTIVE) == 0) {
2068                 printf("SCB %d done'd twice\n", scb->hscb->tag);
2069                 ahc_dump_card_state(ahc);
2070                 panic("Stopping for safety");
2071         }
2072         cmd = scb->io_ctx;
2073         dev = scb->platform_data->dev;
2074         dev->active--;
2075         dev->openings++;
2076         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
2077                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
2078                 dev->qfrozen--;
2079         }
2080         ahc_linux_unmap_scb(ahc, scb);
2081
2082         /*
2083          * Guard against stale sense data.
2084          * The Linux mid-layer assumes that sense
2085          * was retrieved anytime the first byte of
2086          * the sense buffer looks "sane".
2087          */
2088         cmd->sense_buffer[0] = 0;
2089         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
2090                 uint32_t amount_xferred;
2091
2092                 amount_xferred =
2093                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
2094                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
2095 #ifdef AHC_DEBUG
2096                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
2097                                 ahc_print_path(ahc, scb);
2098                                 printf("Set CAM_UNCOR_PARITY\n");
2099                         }
2100 #endif
2101                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
2102 #ifdef AHC_REPORT_UNDERFLOWS
2103                 /*
2104                  * This code is disabled by default as some
2105                  * clients of the SCSI system do not properly
2106                  * initialize the underflow parameter.  This
2107                  * results in spurious termination of commands
2108                  * that complete as expected (e.g. underflow is
2109                  * allowed as command can return variable amounts
2110                  * of data.
2111                  */
2112                 } else if (amount_xferred < scb->io_ctx->underflow) {
2113                         u_int i;
2114
2115                         ahc_print_path(ahc, scb);
2116                         printf("CDB:");
2117                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
2118                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
2119                         printf("\n");
2120                         ahc_print_path(ahc, scb);
2121                         printf("Saw underflow (%ld of %ld bytes). "
2122                                "Treated as error\n",
2123                                 ahc_get_residual(scb),
2124                                 ahc_get_transfer_length(scb));
2125                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
2126 #endif
2127                 } else {
2128                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
2129                 }
2130         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
2131                 ahc_linux_handle_scsi_status(ahc, dev, scb);
2132         } else if (ahc_get_transaction_status(scb) == CAM_SEL_TIMEOUT) {
2133                 dev->flags |= AHC_DEV_UNCONFIGURED;
2134         }
2135
2136         if (dev->openings == 1
2137          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
2138          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
2139                 dev->tag_success_count++;
2140         /*
2141          * Some devices deal with temporary internal resource
2142          * shortages by returning queue full.  When the queue
2143          * full occurrs, we throttle back.  Slowly try to get
2144          * back to our previous queue depth.
2145          */
2146         if ((dev->openings + dev->active) < dev->maxtags
2147          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
2148                 dev->tag_success_count = 0;
2149                 dev->openings++;
2150         }
2151
2152         if (dev->active == 0)
2153                 dev->commands_since_idle_or_otag = 0;
2154
2155         if ((dev->flags & AHC_DEV_UNCONFIGURED) != 0
2156             && dev->active == 0
2157             && (dev->flags & AHC_DEV_TIMER_ACTIVE) == 0)
2158                 ahc_linux_free_device(ahc, dev);
2159         else if ((dev->flags & AHC_DEV_ON_RUN_LIST) == 0) {
2160                 TAILQ_INSERT_TAIL(&ahc->platform_data->device_runq, dev, links);
2161                 dev->flags |= AHC_DEV_ON_RUN_LIST;
2162         }
2163
2164         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
2165                 printf("Recovery SCB completes\n");
2166                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
2167                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
2168                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
2169                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2170                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2171                         up(&ahc->platform_data->eh_sem);
2172                 }
2173         }
2174
2175         ahc_free_scb(ahc, scb);
2176         ahc_linux_queue_cmd_complete(ahc, cmd);
2177 }
2178
2179 static void
2180 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
2181                              struct ahc_linux_device *dev, struct scb *scb)
2182 {
2183         struct  ahc_devinfo devinfo;
2184
2185         ahc_compile_devinfo(&devinfo,
2186                             ahc->our_id,
2187                             dev->target->target, dev->lun,
2188                             dev->target->channel == 0 ? 'A' : 'B',
2189                             ROLE_INITIATOR);
2190         
2191         /*
2192          * We don't currently trust the mid-layer to
2193          * properly deal with queue full or busy.  So,
2194          * when one occurs, we tell the mid-layer to
2195          * unconditionally requeue the command to us
2196          * so that we can retry it ourselves.  We also
2197          * implement our own throttling mechanism so
2198          * we don't clobber the device with too many
2199          * commands.
2200          */
2201         switch (ahc_get_scsi_status(scb)) {
2202         default:
2203                 break;
2204         case SCSI_STATUS_CHECK_COND:
2205         case SCSI_STATUS_CMD_TERMINATED:
2206         {
2207                 Scsi_Cmnd *cmd;
2208
2209                 /*
2210                  * Copy sense information to the OS's cmd
2211                  * structure if it is available.
2212                  */
2213                 cmd = scb->io_ctx;
2214                 if (scb->flags & SCB_SENSE) {
2215                         u_int sense_size;
2216
2217                         sense_size = MIN(sizeof(struct scsi_sense_data)
2218                                        - ahc_get_sense_residual(scb),
2219                                          sizeof(cmd->sense_buffer));
2220                         memcpy(cmd->sense_buffer,
2221                                ahc_get_sense_buf(ahc, scb), sense_size);
2222                         if (sense_size < sizeof(cmd->sense_buffer))
2223                                 memset(&cmd->sense_buffer[sense_size], 0,
2224                                        sizeof(cmd->sense_buffer) - sense_size);
2225                         cmd->result |= (DRIVER_SENSE << 24);
2226 #ifdef AHC_DEBUG
2227                         if (ahc_debug & AHC_SHOW_SENSE) {
2228                                 int i;
2229
2230                                 printf("Copied %d bytes of sense data:",
2231                                        sense_size);
2232                                 for (i = 0; i < sense_size; i++) {
2233                                         if ((i & 0xF) == 0)
2234                                                 printf("\n");
2235                                         printf("0x%x ", cmd->sense_buffer[i]);
2236                                 }
2237                                 printf("\n");
2238                         }
2239 #endif
2240                 }
2241                 break;
2242         }
2243         case SCSI_STATUS_QUEUE_FULL:
2244         {
2245                 /*
2246                  * By the time the core driver has returned this
2247                  * command, all other commands that were queued
2248                  * to us but not the device have been returned.
2249                  * This ensures that dev->active is equal to
2250                  * the number of commands actually queued to
2251                  * the device.
2252                  */
2253                 dev->tag_success_count = 0;
2254                 if (dev->active != 0) {
2255                         /*
2256                          * Drop our opening count to the number
2257                          * of commands currently outstanding.
2258                          */
2259                         dev->openings = 0;
2260 /*
2261                         ahc_print_path(ahc, scb);
2262                         printf("Dropping tag count to %d\n", dev->active);
2263  */
2264                         if (dev->active == dev->tags_on_last_queuefull) {
2265
2266                                 dev->last_queuefull_same_count++;
2267                                 /*
2268                                  * If we repeatedly see a queue full
2269                                  * at the same queue depth, this
2270                                  * device has a fixed number of tag
2271                                  * slots.  Lock in this tag depth
2272                                  * so we stop seeing queue fulls from
2273                                  * this device.
2274                                  */
2275                                 if (dev->last_queuefull_same_count
2276                                  == AHC_LOCK_TAGS_COUNT) {
2277                                         dev->maxtags = dev->active;
2278                                         ahc_print_path(ahc, scb);
2279                                         printf("Locking max tag count at %d\n",
2280                                                dev->active);
2281                                 }
2282                         } else {
2283                                 dev->tags_on_last_queuefull = dev->active;
2284                                 dev->last_queuefull_same_count = 0;
2285                         }
2286                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
2287                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
2288                         ahc_platform_set_tags(ahc, &devinfo,
2289                                      (dev->flags & AHC_DEV_Q_BASIC)
2290                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2291                         break;
2292                 }
2293                 /*
2294                  * Drop down to a single opening, and treat this
2295                  * as if the target returned BUSY SCSI status.
2296                  */
2297                 dev->openings = 1;
2298                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
2299                 ahc_platform_set_tags(ahc, &devinfo,
2300                              (dev->flags & AHC_DEV_Q_BASIC)
2301                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2302                 /* FALLTHROUGH */
2303         }
2304         case SCSI_STATUS_BUSY:
2305         {
2306                 /*
2307                  * Set a short timer to defer sending commands for
2308                  * a bit since Linux will not delay in this case.
2309                  */
2310                 if ((dev->flags & AHC_DEV_TIMER_ACTIVE) != 0) {
2311                         printf("%s:%c:%d: Device Timer still active during "
2312                                "busy processing\n", ahc_name(ahc),
2313                                 dev->target->channel, dev->target->target);
2314                         break;
2315                 }
2316                 dev->flags |= AHC_DEV_TIMER_ACTIVE;
2317                 dev->qfrozen++;
2318                 init_timer(&dev->timer);
2319                 dev->timer.data = (u_long)dev;
2320                 dev->timer.expires = jiffies + (HZ/2);
2321                 dev->timer.function = ahc_linux_dev_timed_unfreeze;
2322                 add_timer(&dev->timer);
2323                 break;
2324         }
2325         }
2326 }
2327
2328 static void
2329 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, Scsi_Cmnd *cmd)
2330 {
2331         /*
2332          * Typically, the complete queue has very few entries
2333          * queued to it before the queue is emptied by
2334          * ahc_linux_run_complete_queue, so sorting the entries
2335          * by generation number should be inexpensive.
2336          * We perform the sort so that commands that complete
2337          * with an error are retuned in the order origionally
2338          * queued to the controller so that any subsequent retries
2339          * are performed in order.  The underlying ahc routines do
2340          * not guarantee the order that aborted commands will be
2341          * returned to us.
2342          */
2343         struct ahc_completeq *completeq;
2344         struct ahc_cmd *list_cmd;
2345         struct ahc_cmd *acmd;
2346
2347         /*
2348          * Map CAM error codes into Linux Error codes.  We
2349          * avoid the conversion so that the DV code has the
2350          * full error information available when making
2351          * state change decisions.
2352          */
2353         {
2354                 u_int new_status;
2355
2356                 switch (ahc_cmd_get_transaction_status(cmd)) {
2357                 case CAM_REQ_INPROG:
2358                 case CAM_REQ_CMP:
2359                 case CAM_SCSI_STATUS_ERROR:
2360                         new_status = DID_OK;
2361                         break;
2362                 case CAM_REQ_ABORTED:
2363                         new_status = DID_ABORT;
2364                         break;
2365                 case CAM_BUSY:
2366                         new_status = DID_BUS_BUSY;
2367                         break;
2368                 case CAM_REQ_INVALID:
2369                 case CAM_PATH_INVALID:
2370                         new_status = DID_BAD_TARGET;
2371                         break;
2372                 case CAM_SEL_TIMEOUT:
2373                         new_status = DID_NO_CONNECT;
2374                         break;
2375                 case CAM_SCSI_BUS_RESET:
2376                 case CAM_BDR_SENT:
2377                         new_status = DID_RESET;
2378                         break;
2379                 case CAM_UNCOR_PARITY:
2380                         new_status = DID_PARITY;
2381                         break;
2382                 case CAM_CMD_TIMEOUT:
2383                         new_status = DID_TIME_OUT;
2384                         break;
2385                 case CAM_UA_ABORT:
2386                 case CAM_REQ_CMP_ERR:
2387                 case CAM_AUTOSENSE_FAIL:
2388                 case CAM_NO_HBA:
2389                 case CAM_DATA_RUN_ERR:
2390                 case CAM_UNEXP_BUSFREE:
2391                 case CAM_SEQUENCE_FAIL:
2392                 case CAM_CCB_LEN_ERR:
2393                 case CAM_PROVIDE_FAIL:
2394                 case CAM_REQ_TERMIO:
2395                 case CAM_UNREC_HBA_ERROR:
2396                 case CAM_REQ_TOO_BIG:
2397                         new_status = DID_ERROR;
2398                         break;
2399                 case CAM_REQUEUE_REQ:
2400                         /*
2401                          * If we want the request requeued, make sure there
2402                          * are sufficent retries.  In the old scsi error code,
2403                          * we used to be able to specify a result code that
2404                          * bypassed the retry count.  Now we must use this
2405                          * hack.  We also "fake" a check condition with
2406                          * a sense code of ABORTED COMMAND.  This seems to
2407                          * evoke a retry even if this command is being sent
2408                          * via the eh thread.  Ick!  Ick!  Ick!
2409                          */
2410                         if (cmd->retries > 0)
2411                                 cmd->retries--;
2412                         new_status = DID_OK;
2413                         ahc_cmd_set_scsi_status(cmd, SCSI_STATUS_CHECK_COND);
2414                         cmd->result |= (DRIVER_SENSE << 24);
2415                         memset(cmd->sense_buffer, 0,
2416                                sizeof(cmd->sense_buffer));
2417                         cmd->sense_buffer[0] = SSD_ERRCODE_VALID
2418                                              | SSD_CURRENT_ERROR;
2419                         cmd->sense_buffer[2] = SSD_KEY_ABORTED_COMMAND;
2420                         break;
2421                 default:
2422                         /* We should never get here */
2423                         new_status = DID_ERROR;
2424                         break;
2425                 }
2426
2427                 ahc_cmd_set_transaction_status(cmd, new_status);
2428         }
2429
2430         completeq = &ahc->platform_data->completeq;
2431         list_cmd = TAILQ_FIRST(completeq);
2432         acmd = (struct ahc_cmd *)cmd;
2433         while (list_cmd != NULL
2434             && acmd_scsi_cmd(list_cmd).serial_number
2435              < acmd_scsi_cmd(acmd).serial_number)
2436                 list_cmd = TAILQ_NEXT(list_cmd, acmd_links.tqe);
2437         if (list_cmd != NULL)
2438                 TAILQ_INSERT_BEFORE(list_cmd, acmd, acmd_links.tqe);
2439         else
2440                 TAILQ_INSERT_TAIL(completeq, acmd, acmd_links.tqe);
2441 }
2442
2443 static void
2444 ahc_linux_sem_timeout(u_long arg)
2445 {
2446         struct  ahc_softc *ahc;
2447         u_long  s;
2448
2449         ahc = (struct ahc_softc *)arg;
2450
2451         ahc_lock(ahc, &s);
2452         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2453                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2454                 up(&ahc->platform_data->eh_sem);
2455         }
2456         ahc_unlock(ahc, &s);
2457 }
2458
2459 static void
2460 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2461 {
2462         ahc->platform_data->qfrozen++;
2463         if (ahc->platform_data->qfrozen == 1) {
2464                 scsi_block_requests(ahc->platform_data->host);
2465
2466                 /* XXX What about Twin channels? */
2467                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2468                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2469                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2470         }
2471 }
2472
2473 static void
2474 ahc_linux_release_simq(u_long arg)
2475 {
2476         struct ahc_softc *ahc;
2477         u_long s;
2478         int    unblock_reqs;
2479
2480         ahc = (struct ahc_softc *)arg;
2481
2482         unblock_reqs = 0;
2483         ahc_lock(ahc, &s);
2484         if (ahc->platform_data->qfrozen > 0)
2485                 ahc->platform_data->qfrozen--;
2486         if (ahc->platform_data->qfrozen == 0)
2487                 unblock_reqs = 1;
2488         ahc_unlock(ahc, &s);
2489         /*
2490          * There is still a race here.  The mid-layer
2491          * should keep its own freeze count and use
2492          * a bottom half handler to run the queues
2493          * so we can unblock with our own lock held.
2494          */
2495         if (unblock_reqs)
2496                 scsi_unblock_requests(ahc->platform_data->host);
2497 }
2498
2499 static void
2500 ahc_linux_dev_timed_unfreeze(u_long arg)
2501 {
2502         struct ahc_linux_device *dev;
2503         struct ahc_softc *ahc;
2504         u_long s;
2505
2506         dev = (struct ahc_linux_device *)arg;
2507         ahc = dev->target->ahc;
2508         ahc_lock(ahc, &s);
2509         dev->flags &= ~AHC_DEV_TIMER_ACTIVE;
2510         if (dev->qfrozen > 0)
2511                 dev->qfrozen--;
2512         if (dev->active == 0)
2513                 __ahc_linux_free_device(ahc, dev);
2514         ahc_unlock(ahc, &s);
2515 }
2516
2517 static int
2518 ahc_linux_queue_recovery_cmd(Scsi_Cmnd *cmd, scb_flag flag)
2519 {
2520         struct ahc_softc *ahc;
2521         struct ahc_linux_device *dev;
2522         struct scb *pending_scb;
2523         u_int  saved_scbptr;
2524         u_int  active_scb_index;
2525         u_int  last_phase;
2526         u_int  saved_scsiid;
2527         u_int  cdb_byte;
2528         int    retval;
2529         int    was_paused;
2530         int    paused;
2531         int    wait;
2532         int    disconnected;
2533
2534         pending_scb = NULL;
2535         paused = FALSE;
2536         wait = FALSE;
2537         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2538
2539         printf("%s:%d:%d:%d: Attempting to queue a%s message\n",
2540                ahc_name(ahc), cmd->device->channel,
2541                cmd->device->id, cmd->device->lun,
2542                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2543
2544         printf("CDB:");
2545         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2546                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2547         printf("\n");
2548
2549         /*
2550          * First determine if we currently own this command.
2551          * Start by searching the device queue.  If not found
2552          * there, check the pending_scb list.  If not found
2553          * at all, and the system wanted us to just abort the
2554          * command, return success.
2555          */
2556         dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id,
2557                                    cmd->device->lun, /*alloc*/FALSE);
2558
2559         if (dev == NULL) {
2560                 /*
2561                  * No target device for this command exists,
2562                  * so we must not still own the command.
2563                  */
2564                 printf("%s:%d:%d:%d: Is not an active device\n",
2565                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2566                        cmd->device->lun);
2567                 retval = SUCCESS;
2568                 goto no_cmd;
2569         }
2570
2571         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2572          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2573                                        cmd->device->channel + 'A',
2574                                        cmd->device->lun,
2575                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2576                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2577                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2578                        cmd->device->lun);
2579                 retval = SUCCESS;
2580                 goto done;
2581         }
2582
2583         /*
2584          * See if we can find a matching cmd in the pending list.
2585          */
2586         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2587                 if (pending_scb->io_ctx == cmd)
2588                         break;
2589         }
2590
2591         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2592
2593                 /* Any SCB for this device will do for a target reset */
2594                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2595                         if (ahc_match_scb(ahc, pending_scb, cmd->device->id,
2596                                           cmd->device->channel + 'A',
2597                                           CAM_LUN_WILDCARD,
2598                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2599                                 break;
2600                 }
2601         }
2602
2603         if (pending_scb == NULL) {
2604                 printf("%s:%d:%d:%d: Command not found\n",
2605                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2606                        cmd->device->lun);
2607                 goto no_cmd;
2608         }
2609
2610         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2611                 /*
2612                  * We can't queue two recovery actions using the same SCB
2613                  */
2614                 retval = FAILED;
2615                 goto  done;
2616         }
2617
2618         /*
2619          * Ensure that the card doesn't do anything
2620          * behind our back and that we didn't "just" miss
2621          * an interrupt that would affect this cmd.
2622          */
2623         was_paused = ahc_is_paused(ahc);
2624         ahc_pause_and_flushwork(ahc);
2625         paused = TRUE;
2626
2627         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2628                 printf("%s:%d:%d:%d: Command already completed\n",
2629                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2630                        cmd->device->lun);
2631                 goto no_cmd;
2632         }
2633
2634         printf("%s: At time of recovery, card was %spaused\n",
2635                ahc_name(ahc), was_paused ? "" : "not ");
2636         ahc_dump_card_state(ahc);
2637
2638         disconnected = TRUE;
2639         if (flag == SCB_ABORT) {
2640                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2641                                        cmd->device->channel + 'A',
2642                                        cmd->device->lun,
2643                                        pending_scb->hscb->tag,
2644                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2645                                        SEARCH_COMPLETE) > 0) {
2646                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2647                                ahc_name(ahc), cmd->device->channel,
2648                                         cmd->device->id, cmd->device->lun);
2649                         retval = SUCCESS;
2650                         goto done;
2651                 }
2652         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2653                                       cmd->device->channel + 'A',
2654                                       cmd->device->lun, pending_scb->hscb->tag,
2655                                       ROLE_INITIATOR, /*status*/0,
2656                                       SEARCH_COUNT) > 0) {
2657                 disconnected = FALSE;
2658         }
2659
2660         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2661                 struct scb *bus_scb;
2662
2663                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2664                 if (bus_scb == pending_scb)
2665                         disconnected = FALSE;
2666                 else if (flag != SCB_ABORT
2667                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2668                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2669                         disconnected = FALSE;
2670         }
2671
2672         /*
2673          * At this point, pending_scb is the scb associated with the
2674          * passed in command.  That command is currently active on the
2675          * bus, is in the disconnected state, or we're hoping to find
2676          * a command for the same target active on the bus to abuse to
2677          * send a BDR.  Queue the appropriate message based on which of
2678          * these states we are in.
2679          */
2680         last_phase = ahc_inb(ahc, LASTPHASE);
2681         saved_scbptr = ahc_inb(ahc, SCBPTR);
2682         active_scb_index = ahc_inb(ahc, SCB_TAG);
2683         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2684         if (last_phase != P_BUSFREE
2685          && (pending_scb->hscb->tag == active_scb_index
2686           || (flag == SCB_DEVICE_RESET
2687            && SCSIID_TARGET(ahc, saved_scsiid) == cmd->device->id))) {
2688
2689                 /*
2690                  * We're active on the bus, so assert ATN
2691                  * and hope that the target responds.
2692                  */
2693                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2694                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2695                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2696                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2697                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
2698                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2699                        cmd->device->lun);
2700                 wait = TRUE;
2701         } else if (disconnected) {
2702
2703                 /*
2704                  * Actually re-queue this SCB in an attempt
2705                  * to select the device before it reconnects.
2706                  * In either case (selection or reselection),
2707                  * we will now issue the approprate message
2708                  * to the timed-out device.
2709                  *
2710                  * Set the MK_MESSAGE control bit indicating
2711                  * that we desire to send a message.  We
2712                  * also set the disconnected flag since
2713                  * in the paging case there is no guarantee
2714                  * that our SCB control byte matches the
2715                  * version on the card.  We don't want the
2716                  * sequencer to abort the command thinking
2717                  * an unsolicited reselection occurred.
2718                  */
2719                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2720                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2721
2722                 /*
2723                  * Remove any cached copy of this SCB in the
2724                  * disconnected list in preparation for the
2725                  * queuing of our abort SCB.  We use the
2726                  * same element in the SCB, SCB_NEXT, for
2727                  * both the qinfifo and the disconnected list.
2728                  */
2729                 ahc_search_disc_list(ahc, cmd->device->id,
2730                                      cmd->device->channel + 'A',
2731                                      cmd->device->lun, pending_scb->hscb->tag,
2732                                      /*stop_on_first*/TRUE,
2733                                      /*remove*/TRUE,
2734                                      /*save_state*/FALSE);
2735
2736                 /*
2737                  * In the non-paging case, the sequencer will
2738                  * never re-reference the in-core SCB.
2739                  * To make sure we are notified during
2740                  * reslection, set the MK_MESSAGE flag in
2741                  * the card's copy of the SCB.
2742                  */
2743                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2744                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2745                         ahc_outb(ahc, SCB_CONTROL,
2746                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2747                 }
2748
2749                 /*
2750                  * Clear out any entries in the QINFIFO first
2751                  * so we are the next SCB for this target
2752                  * to run.
2753                  */
2754                 ahc_search_qinfifo(ahc, cmd->device->id,
2755                                    cmd->device->channel + 'A',
2756                                    cmd->device->lun, SCB_LIST_NULL,
2757                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2758                                    SEARCH_COMPLETE);
2759                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2760                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2761                 ahc_print_path(ahc, pending_scb);
2762                 printf("Device is disconnected, re-queuing SCB\n");
2763                 wait = TRUE;
2764         } else {
2765                 printf("%s:%d:%d:%d: Unable to deliver message\n",
2766                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2767                        cmd->device->lun);
2768                 retval = FAILED;
2769                 goto done;
2770         }
2771
2772 no_cmd:
2773         /*
2774          * Our assumption is that if we don't have the command, no
2775          * recovery action was required, so we return success.  Again,
2776          * the semantics of the mid-layer recovery engine are not
2777          * well defined, so this may change in time.
2778          */
2779         retval = SUCCESS;
2780 done:
2781         if (paused)
2782                 ahc_unpause(ahc);
2783         if (wait) {
2784                 struct timer_list timer;
2785                 int ret;
2786
2787                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2788                 spin_unlock_irq(&ahc->platform_data->spin_lock);
2789                 init_timer(&timer);
2790                 timer.data = (u_long)ahc;
2791                 timer.expires = jiffies + (5 * HZ);
2792                 timer.function = ahc_linux_sem_timeout;
2793                 add_timer(&timer);
2794                 printf("Recovery code sleeping\n");
2795                 down(&ahc->platform_data->eh_sem);
2796                 printf("Recovery code awake\n");
2797                 ret = del_timer_sync(&timer);
2798                 if (ret == 0) {
2799                         printf("Timer Expired\n");
2800                         retval = FAILED;
2801                 }
2802                 spin_lock_irq(&ahc->platform_data->spin_lock);
2803         }
2804         ahc_linux_run_complete_queue(ahc);
2805         return (retval);
2806 }
2807
2808 void
2809 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2810 {
2811 }
2812
2813 static void ahc_linux_exit(void);
2814
2815 static void ahc_linux_get_width(struct scsi_target *starget)
2816 {
2817         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2818         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2819         struct ahc_tmode_tstate *tstate;
2820         struct ahc_initiator_tinfo *tinfo 
2821                 = ahc_fetch_transinfo(ahc,
2822                                       starget->channel + 'A',
2823                                       shost->this_id, starget->id, &tstate);
2824         spi_width(starget) = tinfo->curr.width;
2825 }
2826
2827 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2828 {
2829         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2830         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2831         struct ahc_devinfo devinfo;
2832         unsigned long flags;
2833
2834         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2835                             starget->channel + 'A', ROLE_INITIATOR);
2836         ahc_lock(ahc, &flags);
2837         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2838         ahc_unlock(ahc, &flags);
2839 }
2840
2841 static void ahc_linux_get_period(struct scsi_target *starget)
2842 {
2843         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2844         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2845         struct ahc_tmode_tstate *tstate;
2846         struct ahc_initiator_tinfo *tinfo 
2847                 = ahc_fetch_transinfo(ahc,
2848                                       starget->channel + 'A',
2849                                       shost->this_id, starget->id, &tstate);
2850         spi_period(starget) = tinfo->curr.period;
2851 }
2852
2853 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2854 {
2855         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2856         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2857         struct ahc_tmode_tstate *tstate;
2858         struct ahc_initiator_tinfo *tinfo 
2859                 = ahc_fetch_transinfo(ahc,
2860                                       starget->channel + 'A',
2861                                       shost->this_id, starget->id, &tstate);
2862         struct ahc_devinfo devinfo;
2863         unsigned int ppr_options = tinfo->curr.ppr_options;
2864         unsigned long flags;
2865         unsigned long offset = tinfo->curr.offset;
2866         struct ahc_syncrate *syncrate;
2867
2868         if (offset == 0)
2869                 offset = MAX_OFFSET;
2870
2871         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2872                             starget->channel + 'A', ROLE_INITIATOR);
2873
2874         /* all PPR requests apart from QAS require wide transfers */
2875         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2876                 ahc_linux_get_width(starget);
2877                 if (spi_width(starget) == 0)
2878                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2879         }
2880
2881         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2882         ahc_lock(ahc, &flags);
2883         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2884                          ppr_options, AHC_TRANS_GOAL, FALSE);
2885         ahc_unlock(ahc, &flags);
2886 }
2887
2888 static void ahc_linux_get_offset(struct scsi_target *starget)
2889 {
2890         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2891         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2892         struct ahc_tmode_tstate *tstate;
2893         struct ahc_initiator_tinfo *tinfo 
2894                 = ahc_fetch_transinfo(ahc,
2895                                       starget->channel + 'A',
2896                                       shost->this_id, starget->id, &tstate);
2897         spi_offset(starget) = tinfo->curr.offset;
2898 }
2899
2900 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2901 {
2902         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2903         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2904         struct ahc_tmode_tstate *tstate;
2905         struct ahc_initiator_tinfo *tinfo 
2906                 = ahc_fetch_transinfo(ahc,
2907                                       starget->channel + 'A',
2908                                       shost->this_id, starget->id, &tstate);
2909         struct ahc_devinfo devinfo;
2910         unsigned int ppr_options = 0;
2911         unsigned int period = 0;
2912         unsigned long flags;
2913         struct ahc_syncrate *syncrate = NULL;
2914
2915         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2916                             starget->channel + 'A', ROLE_INITIATOR);
2917         if (offset != 0) {
2918                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2919                 period = tinfo->curr.period;
2920                 ppr_options = tinfo->curr.ppr_options;
2921         }
2922         ahc_lock(ahc, &flags);
2923         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2924                          ppr_options, AHC_TRANS_GOAL, FALSE);
2925         ahc_unlock(ahc, &flags);
2926 }
2927
2928 static void ahc_linux_get_dt(struct scsi_target *starget)
2929 {
2930         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2931         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2932         struct ahc_tmode_tstate *tstate;
2933         struct ahc_initiator_tinfo *tinfo 
2934                 = ahc_fetch_transinfo(ahc,
2935                                       starget->channel + 'A',
2936                                       shost->this_id, starget->id, &tstate);
2937         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ;
2938 }
2939
2940 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2941 {
2942         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2943         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2944         struct ahc_tmode_tstate *tstate;
2945         struct ahc_initiator_tinfo *tinfo 
2946                 = ahc_fetch_transinfo(ahc,
2947                                       starget->channel + 'A',
2948                                       shost->this_id, starget->id, &tstate);
2949         struct ahc_devinfo devinfo;
2950         unsigned int ppr_options = tinfo->curr.ppr_options
2951                 & ~MSG_EXT_PPR_DT_REQ;
2952         unsigned int period = tinfo->curr.period;
2953         unsigned long flags;
2954         struct ahc_syncrate *syncrate;
2955
2956         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2957                             starget->channel + 'A', ROLE_INITIATOR);
2958         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2959         ahc_lock(ahc, &flags);
2960         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
2961                          ppr_options, AHC_TRANS_GOAL, FALSE);
2962         ahc_unlock(ahc, &flags);
2963 }
2964
2965 static void ahc_linux_get_qas(struct scsi_target *starget)
2966 {
2967         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2968         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2969         struct ahc_tmode_tstate *tstate;
2970         struct ahc_initiator_tinfo *tinfo 
2971                 = ahc_fetch_transinfo(ahc,
2972                                       starget->channel + 'A',
2973                                       shost->this_id, starget->id, &tstate);
2974         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ;
2975 }
2976
2977 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2978 {
2979         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2980         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2981         struct ahc_tmode_tstate *tstate;
2982         struct ahc_initiator_tinfo *tinfo 
2983                 = ahc_fetch_transinfo(ahc,
2984                                       starget->channel + 'A',
2985                                       shost->this_id, starget->id, &tstate);
2986         struct ahc_devinfo devinfo;
2987         unsigned int ppr_options = tinfo->curr.ppr_options
2988                 & ~MSG_EXT_PPR_QAS_REQ;
2989         unsigned int period = tinfo->curr.period;
2990         unsigned long flags;
2991         struct ahc_syncrate *syncrate;
2992
2993         if (qas)
2994                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2995
2996         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2997                             starget->channel + 'A', ROLE_INITIATOR);
2998         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2999         ahc_lock(ahc, &flags);
3000         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
3001                          ppr_options, AHC_TRANS_GOAL, FALSE);
3002         ahc_unlock(ahc, &flags);
3003 }
3004
3005 static void ahc_linux_get_iu(struct scsi_target *starget)
3006 {
3007         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3008         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
3009         struct ahc_tmode_tstate *tstate;
3010         struct ahc_initiator_tinfo *tinfo 
3011                 = ahc_fetch_transinfo(ahc,
3012                                       starget->channel + 'A',
3013                                       shost->this_id, starget->id, &tstate);
3014         spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ;
3015 }
3016
3017 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
3018 {
3019         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3020         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
3021         struct ahc_tmode_tstate *tstate;
3022         struct ahc_initiator_tinfo *tinfo 
3023                 = ahc_fetch_transinfo(ahc,
3024                                       starget->channel + 'A',
3025                                       shost->this_id, starget->id, &tstate);
3026         struct ahc_devinfo devinfo;
3027         unsigned int ppr_options = tinfo->curr.ppr_options
3028                 & ~MSG_EXT_PPR_IU_REQ;
3029         unsigned int period = tinfo->curr.period;
3030         unsigned long flags;
3031         struct ahc_syncrate *syncrate;
3032
3033         if (iu)
3034                 ppr_options |= MSG_EXT_PPR_IU_REQ;
3035
3036         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
3037                             starget->channel + 'A', ROLE_INITIATOR);
3038         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
3039         ahc_lock(ahc, &flags);
3040         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->curr.offset,
3041                          ppr_options, AHC_TRANS_GOAL, FALSE);
3042         ahc_unlock(ahc, &flags);
3043 }
3044
3045 static struct spi_function_template ahc_linux_transport_functions = {
3046         .get_offset     = ahc_linux_get_offset,
3047         .set_offset     = ahc_linux_set_offset,
3048         .show_offset    = 1,
3049         .get_period     = ahc_linux_get_period,
3050         .set_period     = ahc_linux_set_period,
3051         .show_period    = 1,
3052         .get_width      = ahc_linux_get_width,
3053         .set_width      = ahc_linux_set_width,
3054         .show_width     = 1,
3055         .get_dt         = ahc_linux_get_dt,
3056         .set_dt         = ahc_linux_set_dt,
3057         .show_dt        = 1,
3058         .get_iu         = ahc_linux_get_iu,
3059         .set_iu         = ahc_linux_set_iu,
3060         .show_iu        = 1,
3061         .get_qas        = ahc_linux_get_qas,
3062         .set_qas        = ahc_linux_set_qas,
3063         .show_qas       = 1,
3064 };
3065
3066
3067
3068 static int __init
3069 ahc_linux_init(void)
3070 {
3071         ahc_linux_transport_template = spi_attach_transport(&ahc_linux_transport_functions);
3072         if (!ahc_linux_transport_template)
3073                 return -ENODEV;
3074         if (ahc_linux_detect(&aic7xxx_driver_template))
3075                 return 0;
3076         spi_release_transport(ahc_linux_transport_template);
3077         ahc_linux_exit();
3078         return -ENODEV;
3079 }
3080
3081 static void
3082 ahc_linux_exit(void)
3083 {
3084         ahc_linux_pci_exit();
3085         ahc_linux_eisa_exit();
3086         spi_release_transport(ahc_linux_transport_template);
3087 }
3088
3089 module_init(ahc_linux_init);
3090 module_exit(ahc_linux_exit);