Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[linux-2.6] / drivers / scsi / aic7xxx / aic7xxx_osm.c
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
126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
127
128 /*
129  * Include aiclib.c as part of our
130  * "module dependencies are hard" work around.
131  */
132 #include "aiclib.c"
133
134 #include <linux/init.h>         /* __setup */
135 #include <linux/mm.h>           /* For fetching system memory size */
136 #include <linux/blkdev.h>               /* For block_size() */
137 #include <linux/delay.h>        /* For ssleep/msleep */
138
139 /*
140  * Lock protecting manipulation of the ahc softc list.
141  */
142 spinlock_t ahc_list_spinlock;
143
144 /*
145  * Set this to the delay in seconds after SCSI bus reset.
146  * Note, we honor this only for the initial bus reset.
147  * The scsi error recovery code performs its own bus settle
148  * delay handling for error recovery actions.
149  */
150 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
151 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
152 #else
153 #define AIC7XXX_RESET_DELAY 5000
154 #endif
155
156 /*
157  * Control collection of SCSI transfer statistics for the /proc filesystem.
158  *
159  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
160  * NOTE: This does affect performance since it has to maintain statistics.
161  */
162 #ifdef CONFIG_AIC7XXX_PROC_STATS
163 #define AIC7XXX_PROC_STATS
164 #endif
165
166 /*
167  * To change the default number of tagged transactions allowed per-device,
168  * add a line to the lilo.conf file like:
169  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
170  * which will result in the first four devices on the first two
171  * controllers being set to a tagged queue depth of 32.
172  *
173  * The tag_commands is an array of 16 to allow for wide and twin adapters.
174  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
175  * for channel 1.
176  */
177 typedef struct {
178         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
179 } adapter_tag_info_t;
180
181 /*
182  * Modify this as you see fit for your system.
183  *
184  * 0                    tagged queuing disabled
185  * 1 <= n <= 253        n == max tags ever dispatched.
186  *
187  * The driver will throttle the number of commands dispatched to a
188  * device if it returns queue full.  For devices with a fixed maximum
189  * queue depth, the driver will eventually determine this depth and
190  * lock it in (a console message is printed to indicate that a lock
191  * has occurred).  On some devices, queue full is returned for a temporary
192  * resource shortage.  These devices will return queue full at varying
193  * depths.  The driver will throttle back when the queue fulls occur and
194  * attempt to slowly increase the depth over time as the device recovers
195  * from the resource shortage.
196  *
197  * In this example, the first line will disable tagged queueing for all
198  * the devices on the first probed aic7xxx adapter.
199  *
200  * The second line enables tagged queueing with 4 commands/LUN for IDs
201  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
202  * driver to attempt to use up to 64 tags for ID 1.
203  *
204  * The third line is the same as the first line.
205  *
206  * The fourth line disables tagged queueing for devices 0 and 3.  It
207  * enables tagged queueing for the other IDs, with 16 commands/LUN
208  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
209  * IDs 2, 5-7, and 9-15.
210  */
211
212 /*
213  * NOTE: The below structure is for reference only, the actual structure
214  *       to modify in order to change things is just below this comment block.
215 adapter_tag_info_t aic7xxx_tag_info[] =
216 {
217         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
218         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
219         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
220         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
221 };
222 */
223
224 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
225 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
226 #else
227 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
228 #endif
229
230 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
231         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
232         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
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 }
240
241 /*
242  * By default, use the number of commands specified by
243  * the users kernel configuration.
244  */
245 static adapter_tag_info_t aic7xxx_tag_info[] =
246 {
247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
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 };
264
265 /*
266  * There should be a specific return value for this in scsi.h, but
267  * it seems that most drivers ignore it.
268  */
269 #define DID_UNDERFLOW   DID_ERROR
270
271 void
272 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
273 {
274         printk("(scsi%d:%c:%d:%d): ",
275                ahc->platform_data->host->host_no,
276                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
277                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
278                scb != NULL ? SCB_GET_LUN(scb) : -1);
279 }
280
281 /*
282  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
283  *       cards in the system.  This should be fixed.  Exceptions to this
284  *       rule are noted in the comments.
285  */
286
287 /*
288  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
289  * has no effect on any later resets that might occur due to things like
290  * SCSI bus timeouts.
291  */
292 static uint32_t aic7xxx_no_reset;
293
294 /*
295  * Certain PCI motherboards will scan PCI devices from highest to lowest,
296  * others scan from lowest to highest, and they tend to do all kinds of
297  * strange things when they come into contact with PCI bridge chips.  The
298  * net result of all this is that the PCI card that is actually used to boot
299  * the machine is very hard to detect.  Most motherboards go from lowest
300  * PCI slot number to highest, and the first SCSI controller found is the
301  * one you boot from.  The only exceptions to this are when a controller
302  * has its BIOS disabled.  So, we by default sort all of our SCSI controllers
303  * from lowest PCI slot number to highest PCI slot number.  We also force
304  * all controllers with their BIOS disabled to the end of the list.  This
305  * works on *almost* all computers.  Where it doesn't work, we have this
306  * option.  Setting this option to non-0 will reverse the order of the sort
307  * to highest first, then lowest, but will still leave cards with their BIOS
308  * disabled at the very end.  That should fix everyone up unless there are
309  * really strange cirumstances.
310  */
311 static uint32_t aic7xxx_reverse_scan;
312
313 /*
314  * Should we force EXTENDED translation on a controller.
315  *     0 == Use whatever is in the SEEPROM or default to off
316  *     1 == Use whatever is in the SEEPROM or default to on
317  */
318 static uint32_t aic7xxx_extended;
319
320 /*
321  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
322  * dubious at best.  To my knowledge, this option has never actually
323  * solved a PCI parity problem, but on certain machines with broken PCI
324  * chipset configurations where stray PCI transactions with bad parity are
325  * the norm rather than the exception, the error messages can be overwelming.
326  * It's included in the driver for completeness.
327  *   0     = Shut off PCI parity check
328  *   non-0 = reverse polarity pci parity checking
329  */
330 static uint32_t aic7xxx_pci_parity = ~0;
331
332 /*
333  * There are lots of broken chipsets in the world.  Some of them will
334  * violate the PCI spec when we issue byte sized memory writes to our
335  * controller.  I/O mapped register access, if allowed by the given
336  * platform, will work in almost all cases.
337  */
338 uint32_t aic7xxx_allow_memio = ~0;
339
340 /*
341  * aic7xxx_detect() has been run, so register all device arrivals
342  * immediately with the system rather than deferring to the sorted
343  * attachment performed by aic7xxx_detect().
344  */
345 int aic7xxx_detect_complete;
346
347 /*
348  * So that we can set how long each device is given as a selection timeout.
349  * The table of values goes like this:
350  *   0 - 256ms
351  *   1 - 128ms
352  *   2 - 64ms
353  *   3 - 32ms
354  * We default to 256ms because some older devices need a longer time
355  * to respond to initial selection.
356  */
357 static uint32_t aic7xxx_seltime;
358
359 /*
360  * Certain devices do not perform any aging on commands.  Should the
361  * device be saturated by commands in one portion of the disk, it is
362  * possible for transactions on far away sectors to never be serviced.
363  * To handle these devices, we can periodically send an ordered tag to
364  * force all outstanding transactions to be serviced prior to a new
365  * transaction.
366  */
367 uint32_t aic7xxx_periodic_otag;
368
369 /*
370  * Module information and settable options.
371  */
372 static char *aic7xxx = NULL;
373
374 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
375 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
376 MODULE_LICENSE("Dual BSD/GPL");
377 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
378 module_param(aic7xxx, charp, 0444);
379 MODULE_PARM_DESC(aic7xxx,
380 "period delimited, options string.\n"
381 "       verbose                 Enable verbose/diagnostic logging\n"
382 "       allow_memio             Allow device registers to be memory mapped\n"
383 "       debug                   Bitmask of debug values to enable\n"
384 "       no_probe                Toggle EISA/VLB controller probing\n"
385 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
386 "       no_reset                Supress initial bus resets\n"
387 "       extended                Enable extended geometry on all controllers\n"
388 "       periodic_otag           Send an ordered tagged transaction\n"
389 "                               periodically to prevent tag starvation.\n"
390 "                               This may be required by some older disk\n"
391 "                               drives or RAID arrays.\n"
392 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
393 "       tag_info:<tag_str>      Set per-target tag depth\n"
394 "       global_tag_depth:<int>  Global tag depth for every target\n"
395 "                               on every bus\n"
396 "       seltime:<int>           Selection Timeout\n"
397 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
398 "\n"
399 "       Sample /etc/modprobe.conf line:\n"
400 "               Toggle EISA/VLB probing\n"
401 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
402 "               Shorten the selection timeout to 128ms\n"
403 "\n"
404 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
405 );
406
407 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
408                                          struct scsi_device *,
409                                          struct scb *);
410 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
411                                          struct scsi_cmnd *cmd);
412 static void ahc_linux_sem_timeout(u_long arg);
413 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
414 static void ahc_linux_release_simq(u_long arg);
415 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
416 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
417 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
418                                      struct ahc_devinfo *devinfo);
419 static void ahc_linux_device_queue_depth(struct scsi_device *);
420 static int ahc_linux_run_command(struct ahc_softc*,
421                                  struct ahc_linux_device *,
422                                  struct scsi_cmnd *);
423 static void ahc_linux_setup_tag_info_global(char *p);
424 static aic_option_callback_t ahc_linux_setup_tag_info;
425 static int  aic7xxx_setup(char *s);
426 static int  ahc_linux_next_unit(void);
427
428 /********************************* Inlines ************************************/
429 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
430
431 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
432                                       struct ahc_dma_seg *sg,
433                                       dma_addr_t addr, bus_size_t len);
434
435 static __inline void
436 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
437 {
438         struct scsi_cmnd *cmd;
439
440         cmd = scb->io_ctx;
441         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
442         if (cmd->use_sg != 0) {
443                 struct scatterlist *sg;
444
445                 sg = (struct scatterlist *)cmd->request_buffer;
446                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
447                              cmd->sc_data_direction);
448         } else if (cmd->request_bufflen != 0) {
449                 pci_unmap_single(ahc->dev_softc,
450                                  scb->platform_data->buf_busaddr,
451                                  cmd->request_bufflen,
452                                  cmd->sc_data_direction);
453         }
454 }
455
456 static __inline int
457 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
458                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
459 {
460         int      consumed;
461
462         if ((scb->sg_count + 1) > AHC_NSEG)
463                 panic("Too few segs for dma mapping.  "
464                       "Increase AHC_NSEG\n");
465
466         consumed = 1;
467         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
468         scb->platform_data->xfer_len += len;
469
470         if (sizeof(dma_addr_t) > 4
471          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
472                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
473
474         sg->len = ahc_htole32(len);
475         return (consumed);
476 }
477
478 /*
479  * Try to detect an Adaptec 7XXX controller.
480  */
481 static int
482 ahc_linux_detect(struct scsi_host_template *template)
483 {
484         struct  ahc_softc *ahc;
485         int     found = 0;
486
487         /*
488          * If we've been passed any parameters, process them now.
489          */
490         if (aic7xxx)
491                 aic7xxx_setup(aic7xxx);
492
493         template->proc_name = "aic7xxx";
494
495         /*
496          * Initialize our softc list lock prior to
497          * probing for any adapters.
498          */
499         ahc_list_lockinit();
500
501         found = ahc_linux_pci_init();
502         if (!ahc_linux_eisa_init())
503                 found++;
504         
505         /*
506          * Register with the SCSI layer all
507          * controllers we've found.
508          */
509         TAILQ_FOREACH(ahc, &ahc_tailq, links) {
510
511                 if (ahc_linux_register_host(ahc, template) == 0)
512                         found++;
513         }
514
515         aic7xxx_detect_complete++;
516
517         return (found);
518 }
519
520 /*
521  * Return a string describing the driver.
522  */
523 static const char *
524 ahc_linux_info(struct Scsi_Host *host)
525 {
526         static char buffer[512];
527         char    ahc_info[256];
528         char   *bp;
529         struct ahc_softc *ahc;
530
531         bp = &buffer[0];
532         ahc = *(struct ahc_softc **)host->hostdata;
533         memset(bp, 0, sizeof(buffer));
534         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
535         strcat(bp, AIC7XXX_DRIVER_VERSION);
536         strcat(bp, "\n");
537         strcat(bp, "        <");
538         strcat(bp, ahc->description);
539         strcat(bp, ">\n");
540         strcat(bp, "        ");
541         ahc_controller_info(ahc, ahc_info);
542         strcat(bp, ahc_info);
543         strcat(bp, "\n");
544
545         return (bp);
546 }
547
548 /*
549  * Queue an SCB to the controller.
550  */
551 static int
552 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
553 {
554         struct   ahc_softc *ahc;
555         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
556
557         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
558
559         /*
560          * Save the callback on completion function.
561          */
562         cmd->scsi_done = scsi_done;
563
564         /*
565          * Close the race of a command that was in the process of
566          * being queued to us just as our simq was frozen.  Let
567          * DV commands through so long as we are only frozen to
568          * perform DV.
569          */
570         if (ahc->platform_data->qfrozen != 0)
571                 return SCSI_MLQUEUE_HOST_BUSY;
572
573         cmd->result = CAM_REQ_INPROG << 16;
574
575         return ahc_linux_run_command(ahc, dev, cmd);
576 }
577
578 static inline struct scsi_target **
579 ahc_linux_target_in_softc(struct scsi_target *starget)
580 {
581         struct  ahc_softc *ahc =
582                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
583         unsigned int target_offset;
584
585         target_offset = starget->id;
586         if (starget->channel != 0)
587                 target_offset += 8;
588
589         return &ahc->platform_data->starget[target_offset];
590 }
591
592 static int
593 ahc_linux_target_alloc(struct scsi_target *starget)
594 {
595         struct  ahc_softc *ahc =
596                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
597         struct seeprom_config *sc = ahc->seep_config;
598         unsigned long flags;
599         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
600         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
601         unsigned short scsirate;
602         struct ahc_devinfo devinfo;
603         struct ahc_initiator_tinfo *tinfo;
604         struct ahc_tmode_tstate *tstate;
605         char channel = starget->channel + 'A';
606         unsigned int our_id = ahc->our_id;
607         unsigned int target_offset;
608
609         target_offset = starget->id;
610         if (starget->channel != 0)
611                 target_offset += 8;
612           
613         if (starget->channel)
614                 our_id = ahc->our_id_b;
615
616         ahc_lock(ahc, &flags);
617
618         BUG_ON(*ahc_targp != NULL);
619
620         *ahc_targp = starget;
621         memset(targ, 0, sizeof(*targ));
622
623         if (sc) {
624                 int maxsync = AHC_SYNCRATE_DT;
625                 int ultra = 0;
626                 int flags = sc->device_flags[target_offset];
627
628                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
629                     if (flags & CFSYNCHISULTRA)
630                         ultra = 1;
631                 } else if (flags & CFULTRAEN)
632                         ultra = 1;
633                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
634                  * change it to ultra=0, CFXFER = 0 */
635                 if(ultra && (flags & CFXFER) == 0x04) {
636                         ultra = 0;
637                         flags &= ~CFXFER;
638                 }
639             
640                 if ((ahc->features & AHC_ULTRA2) != 0) {
641                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
642                 } else {
643                         scsirate = (flags & CFXFER) << 4;
644                         maxsync = ultra ? AHC_SYNCRATE_ULTRA : 
645                                 AHC_SYNCRATE_FAST;
646                 }
647                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
648                 if (!(flags & CFSYNCH))
649                         spi_max_offset(starget) = 0;
650                 spi_min_period(starget) = 
651                         ahc_find_period(ahc, scsirate, maxsync);
652
653                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
654                                             starget->id, &tstate);
655         }
656         ahc_compile_devinfo(&devinfo, our_id, starget->id,
657                             CAM_LUN_WILDCARD, channel,
658                             ROLE_INITIATOR);
659         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
660                          AHC_TRANS_GOAL, /*paused*/FALSE);
661         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
662                       AHC_TRANS_GOAL, /*paused*/FALSE);
663         ahc_unlock(ahc, &flags);
664
665         return 0;
666 }
667
668 static void
669 ahc_linux_target_destroy(struct scsi_target *starget)
670 {
671         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
672
673         *ahc_targp = NULL;
674 }
675
676 static int
677 ahc_linux_slave_alloc(struct scsi_device *sdev)
678 {
679         struct  ahc_softc *ahc =
680                 *((struct ahc_softc **)sdev->host->hostdata);
681         struct scsi_target *starget = sdev->sdev_target;
682         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
683         struct ahc_linux_device *dev;
684
685         if (bootverbose)
686                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
687
688         BUG_ON(targ->sdev[sdev->lun] != NULL);
689
690         dev = scsi_transport_device_data(sdev);
691         memset(dev, 0, sizeof(*dev));
692
693         /*
694          * We start out life using untagged
695          * transactions of which we allow one.
696          */
697         dev->openings = 1;
698
699         /*
700          * Set maxtags to 0.  This will be changed if we
701          * later determine that we are dealing with
702          * a tagged queuing capable device.
703          */
704         dev->maxtags = 0;
705         
706         targ->sdev[sdev->lun] = sdev;
707
708         return 0;
709 }
710
711 static int
712 ahc_linux_slave_configure(struct scsi_device *sdev)
713 {
714         struct  ahc_softc *ahc;
715
716         ahc = *((struct ahc_softc **)sdev->host->hostdata);
717
718         if (bootverbose)
719                 printf("%s: Slave Configure %d\n", ahc_name(ahc), sdev->id);
720
721         ahc_linux_device_queue_depth(sdev);
722
723         /* Initial Domain Validation */
724         if (!spi_initial_dv(sdev->sdev_target))
725                 spi_dv_device(sdev);
726
727         return 0;
728 }
729
730 static void
731 ahc_linux_slave_destroy(struct scsi_device *sdev)
732 {
733         struct  ahc_softc *ahc;
734         struct  ahc_linux_device *dev = scsi_transport_device_data(sdev);
735         struct  ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
736
737         ahc = *((struct ahc_softc **)sdev->host->hostdata);
738         if (bootverbose)
739                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);
740
741         BUG_ON(dev->active);
742
743         targ->sdev[sdev->lun] = NULL;
744 }
745
746 #if defined(__i386__)
747 /*
748  * Return the disk geometry for the given SCSI device.
749  */
750 static int
751 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
752                     sector_t capacity, int geom[])
753 {
754         uint8_t *bh;
755         int      heads;
756         int      sectors;
757         int      cylinders;
758         int      ret;
759         int      extended;
760         struct   ahc_softc *ahc;
761         u_int    channel;
762
763         ahc = *((struct ahc_softc **)sdev->host->hostdata);
764         channel = sdev->channel;
765
766         bh = scsi_bios_ptable(bdev);
767         if (bh) {
768                 ret = scsi_partsize(bh, capacity,
769                                     &geom[2], &geom[0], &geom[1]);
770                 kfree(bh);
771                 if (ret != -1)
772                         return (ret);
773         }
774         heads = 64;
775         sectors = 32;
776         cylinders = aic_sector_div(capacity, heads, sectors);
777
778         if (aic7xxx_extended != 0)
779                 extended = 1;
780         else if (channel == 0)
781                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
782         else
783                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
784         if (extended && cylinders >= 1024) {
785                 heads = 255;
786                 sectors = 63;
787                 cylinders = aic_sector_div(capacity, heads, sectors);
788         }
789         geom[0] = heads;
790         geom[1] = sectors;
791         geom[2] = cylinders;
792         return (0);
793 }
794 #endif
795
796 /*
797  * Abort the current SCSI command(s).
798  */
799 static int
800 ahc_linux_abort(struct scsi_cmnd *cmd)
801 {
802         int error;
803
804         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
805         if (error != 0)
806                 printf("aic7xxx_abort returns 0x%x\n", error);
807         return (error);
808 }
809
810 /*
811  * Attempt to send a target reset message to the device that timed out.
812  */
813 static int
814 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
815 {
816         int error;
817
818         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
819         if (error != 0)
820                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
821         return (error);
822 }
823
824 /*
825  * Reset the SCSI bus.
826  */
827 static int
828 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
829 {
830         struct ahc_softc *ahc;
831         int    found;
832         unsigned long flags;
833
834         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
835
836         ahc_lock(ahc, &flags);
837         found = ahc_reset_channel(ahc, cmd->device->channel + 'A',
838                                   /*initiate reset*/TRUE);
839         ahc_unlock(ahc, &flags);
840
841         if (bootverbose)
842                 printf("%s: SCSI bus reset delivered. "
843                        "%d SCBs aborted.\n", ahc_name(ahc), found);
844
845         return SUCCESS;
846 }
847
848 struct scsi_host_template aic7xxx_driver_template = {
849         .module                 = THIS_MODULE,
850         .name                   = "aic7xxx",
851         .proc_info              = ahc_linux_proc_info,
852         .info                   = ahc_linux_info,
853         .queuecommand           = ahc_linux_queue,
854         .eh_abort_handler       = ahc_linux_abort,
855         .eh_device_reset_handler = ahc_linux_dev_reset,
856         .eh_bus_reset_handler   = ahc_linux_bus_reset,
857 #if defined(__i386__)
858         .bios_param             = ahc_linux_biosparam,
859 #endif
860         .can_queue              = AHC_MAX_QUEUE,
861         .this_id                = -1,
862         .cmd_per_lun            = 2,
863         .use_clustering         = ENABLE_CLUSTERING,
864         .slave_alloc            = ahc_linux_slave_alloc,
865         .slave_configure        = ahc_linux_slave_configure,
866         .slave_destroy          = ahc_linux_slave_destroy,
867         .target_alloc           = ahc_linux_target_alloc,
868         .target_destroy         = ahc_linux_target_destroy,
869 };
870
871 /**************************** Tasklet Handler *********************************/
872
873 /******************************** Macros **************************************/
874 #define BUILD_SCSIID(ahc, cmd)                                              \
875         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
876         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
877         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
878
879 /******************************** Bus DMA *************************************/
880 int
881 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
882                    bus_size_t alignment, bus_size_t boundary,
883                    dma_addr_t lowaddr, dma_addr_t highaddr,
884                    bus_dma_filter_t *filter, void *filterarg,
885                    bus_size_t maxsize, int nsegments,
886                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
887 {
888         bus_dma_tag_t dmat;
889
890         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
891         if (dmat == NULL)
892                 return (ENOMEM);
893
894         /*
895          * Linux is very simplistic about DMA memory.  For now don't
896          * maintain all specification information.  Once Linux supplies
897          * better facilities for doing these operations, or the
898          * needs of this particular driver change, we might need to do
899          * more here.
900          */
901         dmat->alignment = alignment;
902         dmat->boundary = boundary;
903         dmat->maxsize = maxsize;
904         *ret_tag = dmat;
905         return (0);
906 }
907
908 void
909 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
910 {
911         free(dmat, M_DEVBUF);
912 }
913
914 int
915 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
916                  int flags, bus_dmamap_t *mapp)
917 {
918         *vaddr = pci_alloc_consistent(ahc->dev_softc,
919                                       dmat->maxsize, mapp);
920         if (*vaddr == NULL)
921                 return ENOMEM;
922         return 0;
923 }
924
925 void
926 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
927                 void* vaddr, bus_dmamap_t map)
928 {
929         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
930                             vaddr, map);
931 }
932
933 int
934 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
935                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
936                 void *cb_arg, int flags)
937 {
938         /*
939          * Assume for now that this will only be used during
940          * initialization and not for per-transaction buffer mapping.
941          */
942         bus_dma_segment_t stack_sg;
943
944         stack_sg.ds_addr = map;
945         stack_sg.ds_len = dmat->maxsize;
946         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
947         return (0);
948 }
949
950 void
951 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
952 {
953 }
954
955 int
956 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
957 {
958         /* Nothing to do */
959         return (0);
960 }
961
962 /********************* Platform Dependent Functions ***************************/
963 /*
964  * Compare "left hand" softc with "right hand" softc, returning:
965  * < 0 - lahc has a lower priority than rahc
966  *   0 - Softcs are equal
967  * > 0 - lahc has a higher priority than rahc
968  */
969 int
970 ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc)
971 {
972         int     value;
973         int     rvalue;
974         int     lvalue;
975
976         /*
977          * Under Linux, cards are ordered as follows:
978          *      1) VLB/EISA BIOS enabled devices sorted by BIOS address.
979          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
980          *      3) All remaining VLB/EISA devices sorted by ioport.
981          *      4) All remaining PCI devices sorted by bus/slot/func.
982          */
983         value = (lahc->flags & AHC_BIOS_ENABLED)
984               - (rahc->flags & AHC_BIOS_ENABLED);
985         if (value != 0)
986                 /* Controllers with BIOS enabled have a *higher* priority */
987                 return (value);
988
989         /*
990          * Same BIOS setting, now sort based on bus type.
991          * EISA and VL controllers sort together.  EISA/VL
992          * have higher priority than PCI.
993          */
994         rvalue = (rahc->chip & AHC_BUS_MASK);
995         if (rvalue == AHC_VL)
996                 rvalue = AHC_EISA;
997         lvalue = (lahc->chip & AHC_BUS_MASK);
998         if (lvalue == AHC_VL)
999                 lvalue = AHC_EISA;
1000         value = rvalue - lvalue;
1001         if (value != 0)
1002                 return (value);
1003
1004         /* Still equal.  Sort by BIOS address, ioport, or bus/slot/func. */
1005         switch (rvalue) {
1006 #ifdef CONFIG_PCI
1007         case AHC_PCI:
1008         {
1009                 char primary_channel;
1010
1011                 if (aic7xxx_reverse_scan != 0)
1012                         value = ahc_get_pci_bus(lahc->dev_softc)
1013                               - ahc_get_pci_bus(rahc->dev_softc);
1014                 else
1015                         value = ahc_get_pci_bus(rahc->dev_softc)
1016                               - ahc_get_pci_bus(lahc->dev_softc);
1017                 if (value != 0)
1018                         break;
1019                 if (aic7xxx_reverse_scan != 0)
1020                         value = ahc_get_pci_slot(lahc->dev_softc)
1021                               - ahc_get_pci_slot(rahc->dev_softc);
1022                 else
1023                         value = ahc_get_pci_slot(rahc->dev_softc)
1024                               - ahc_get_pci_slot(lahc->dev_softc);
1025                 if (value != 0)
1026                         break;
1027                 /*
1028                  * On multi-function devices, the user can choose
1029                  * to have function 1 probed before function 0.
1030                  * Give whichever channel is the primary channel
1031                  * the highest priority.
1032                  */
1033                 primary_channel = (lahc->flags & AHC_PRIMARY_CHANNEL) + 'A';
1034                 value = -1;
1035                 if (lahc->channel == primary_channel)
1036                         value = 1;
1037                 break;
1038         }
1039 #endif
1040         case AHC_EISA:
1041                 if ((rahc->flags & AHC_BIOS_ENABLED) != 0) {
1042                         value = rahc->platform_data->bios_address
1043                               - lahc->platform_data->bios_address; 
1044                 } else {
1045                         value = rahc->bsh.ioport
1046                               - lahc->bsh.ioport; 
1047                 }
1048                 break;
1049         default:
1050                 panic("ahc_softc_sort: invalid bus type");
1051         }
1052         return (value);
1053 }
1054
1055 static void
1056 ahc_linux_setup_tag_info_global(char *p)
1057 {
1058         int tags, i, j;
1059
1060         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1061         printf("Setting Global Tags= %d\n", tags);
1062
1063         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
1064                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
1065                         aic7xxx_tag_info[i].tag_commands[j] = tags;
1066                 }
1067         }
1068 }
1069
1070 static void
1071 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1072 {
1073
1074         if ((instance >= 0) && (targ >= 0)
1075          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
1076          && (targ < AHC_NUM_TARGETS)) {
1077                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
1078                 if (bootverbose)
1079                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
1080         }
1081 }
1082
1083 /*
1084  * Handle Linux boot parameters. This routine allows for assigning a value
1085  * to a parameter with a ':' between the parameter and the value.
1086  * ie. aic7xxx=stpwlev:1,extended
1087  */
1088 static int
1089 aic7xxx_setup(char *s)
1090 {
1091         int     i, n;
1092         char   *p;
1093         char   *end;
1094
1095         static struct {
1096                 const char *name;
1097                 uint32_t *flag;
1098         } options[] = {
1099                 { "extended", &aic7xxx_extended },
1100                 { "no_reset", &aic7xxx_no_reset },
1101                 { "verbose", &aic7xxx_verbose },
1102                 { "allow_memio", &aic7xxx_allow_memio},
1103 #ifdef AHC_DEBUG
1104                 { "debug", &ahc_debug },
1105 #endif
1106                 { "reverse_scan", &aic7xxx_reverse_scan },
1107                 { "periodic_otag", &aic7xxx_periodic_otag },
1108                 { "pci_parity", &aic7xxx_pci_parity },
1109                 { "seltime", &aic7xxx_seltime },
1110                 { "tag_info", NULL },
1111                 { "global_tag_depth", NULL },
1112                 { "dv", NULL }
1113         };
1114
1115         end = strchr(s, '\0');
1116
1117         /*
1118          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1119          * will never be 0 in this case.
1120          */
1121         n = 0;
1122
1123         while ((p = strsep(&s, ",.")) != NULL) {
1124                 if (*p == '\0')
1125                         continue;
1126                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1127
1128                         n = strlen(options[i].name);
1129                         if (strncmp(options[i].name, p, n) == 0)
1130                                 break;
1131                 }
1132                 if (i == NUM_ELEMENTS(options))
1133                         continue;
1134
1135                 if (strncmp(p, "global_tag_depth", n) == 0) {
1136                         ahc_linux_setup_tag_info_global(p + n);
1137                 } else if (strncmp(p, "tag_info", n) == 0) {
1138                         s = aic_parse_brace_option("tag_info", p + n, end,
1139                             2, ahc_linux_setup_tag_info, 0);
1140                 } else if (p[n] == ':') {
1141                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1142                 } else if (strncmp(p, "verbose", n) == 0) {
1143                         *(options[i].flag) = 1;
1144                 } else {
1145                         *(options[i].flag) ^= 0xFFFFFFFF;
1146                 }
1147         }
1148         return 1;
1149 }
1150
1151 __setup("aic7xxx=", aic7xxx_setup);
1152
1153 uint32_t aic7xxx_verbose;
1154
1155 int
1156 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1157 {
1158         char     buf[80];
1159         struct   Scsi_Host *host;
1160         char    *new_name;
1161         u_long   s;
1162
1163         template->name = ahc->description;
1164         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1165         if (host == NULL)
1166                 return (ENOMEM);
1167
1168         *((struct ahc_softc **)host->hostdata) = ahc;
1169         ahc_lock(ahc, &s);
1170         scsi_assign_lock(host, &ahc->platform_data->spin_lock);
1171         ahc->platform_data->host = host;
1172         host->can_queue = AHC_MAX_QUEUE;
1173         host->cmd_per_lun = 2;
1174         /* XXX No way to communicate the ID for multiple channels */
1175         host->this_id = ahc->our_id;
1176         host->irq = ahc->platform_data->irq;
1177         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1178         host->max_lun = AHC_NUM_LUNS;
1179         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1180         host->sg_tablesize = AHC_NSEG;
1181         ahc_set_unit(ahc, ahc_linux_next_unit());
1182         sprintf(buf, "scsi%d", host->host_no);
1183         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1184         if (new_name != NULL) {
1185                 strcpy(new_name, buf);
1186                 ahc_set_name(ahc, new_name);
1187         }
1188         host->unique_id = ahc->unit;
1189         ahc_linux_initialize_scsi_bus(ahc);
1190         ahc_intr_enable(ahc, TRUE);
1191         ahc_unlock(ahc, &s);
1192
1193         host->transportt = ahc_linux_transport_template;
1194
1195         scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
1196         scsi_scan_host(host);
1197         return (0);
1198 }
1199
1200 uint64_t
1201 ahc_linux_get_memsize(void)
1202 {
1203         struct sysinfo si;
1204
1205         si_meminfo(&si);
1206         return ((uint64_t)si.totalram << PAGE_SHIFT);
1207 }
1208
1209 /*
1210  * Find the smallest available unit number to use
1211  * for a new device.  We don't just use a static
1212  * count to handle the "repeated hot-(un)plug"
1213  * scenario.
1214  */
1215 static int
1216 ahc_linux_next_unit(void)
1217 {
1218         struct ahc_softc *ahc;
1219         int unit;
1220
1221         unit = 0;
1222 retry:
1223         TAILQ_FOREACH(ahc, &ahc_tailq, links) {
1224                 if (ahc->unit == unit) {
1225                         unit++;
1226                         goto retry;
1227                 }
1228         }
1229         return (unit);
1230 }
1231
1232 /*
1233  * Place the SCSI bus into a known state by either resetting it,
1234  * or forcing transfer negotiations on the next command to any
1235  * target.
1236  */
1237 void
1238 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1239 {
1240         int i;
1241         int numtarg;
1242
1243         i = 0;
1244         numtarg = 0;
1245
1246         if (aic7xxx_no_reset != 0)
1247                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1248
1249         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1250                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1251         else
1252                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1253
1254         if ((ahc->features & AHC_TWIN) != 0) {
1255
1256                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1257                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1258                 } else {
1259                         if (numtarg == 0)
1260                                 i = 8;
1261                         numtarg += 8;
1262                 }
1263         }
1264
1265         /*
1266          * Force negotiation to async for all targets that
1267          * will not see an initial bus reset.
1268          */
1269         for (; i < numtarg; i++) {
1270                 struct ahc_devinfo devinfo;
1271                 struct ahc_initiator_tinfo *tinfo;
1272                 struct ahc_tmode_tstate *tstate;
1273                 u_int our_id;
1274                 u_int target_id;
1275                 char channel;
1276
1277                 channel = 'A';
1278                 our_id = ahc->our_id;
1279                 target_id = i;
1280                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1281                         channel = 'B';
1282                         our_id = ahc->our_id_b;
1283                         target_id = i % 8;
1284                 }
1285                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1286                                             target_id, &tstate);
1287                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1288                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1289                 ahc_update_neg_request(ahc, &devinfo, tstate,
1290                                        tinfo, AHC_NEG_ALWAYS);
1291         }
1292         /* Give the bus some time to recover */
1293         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1294                 ahc_linux_freeze_simq(ahc);
1295                 init_timer(&ahc->platform_data->reset_timer);
1296                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1297                 ahc->platform_data->reset_timer.expires =
1298                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1299                 ahc->platform_data->reset_timer.function =
1300                     ahc_linux_release_simq;
1301                 add_timer(&ahc->platform_data->reset_timer);
1302         }
1303 }
1304
1305 int
1306 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1307 {
1308
1309         ahc->platform_data =
1310             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1311         if (ahc->platform_data == NULL)
1312                 return (ENOMEM);
1313         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1314         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1315         ahc_lockinit(ahc);
1316         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1317         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1318         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1319         if (aic7xxx_pci_parity == 0)
1320                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1321
1322         return (0);
1323 }
1324
1325 void
1326 ahc_platform_free(struct ahc_softc *ahc)
1327 {
1328         struct scsi_target *starget;
1329         int i, j;
1330
1331         if (ahc->platform_data != NULL) {
1332                 if (ahc->platform_data->host != NULL) {
1333                         scsi_remove_host(ahc->platform_data->host);
1334                         scsi_host_put(ahc->platform_data->host);
1335                 }
1336
1337                 /* destroy all of the device and target objects */
1338                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1339                         starget = ahc->platform_data->starget[i];
1340                         if (starget != NULL) {
1341                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1342                                         struct ahc_linux_target *targ =
1343                                                 scsi_transport_target_data(starget);
1344
1345                                         if (targ->sdev[j] == NULL)
1346                                                 continue;
1347                                         targ->sdev[j] = NULL;
1348                                 }
1349                                 ahc->platform_data->starget[i] = NULL;
1350                         }
1351                 }
1352
1353                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1354                         free_irq(ahc->platform_data->irq, ahc);
1355                 if (ahc->tag == BUS_SPACE_PIO
1356                  && ahc->bsh.ioport != 0)
1357                         release_region(ahc->bsh.ioport, 256);
1358                 if (ahc->tag == BUS_SPACE_MEMIO
1359                  && ahc->bsh.maddr != NULL) {
1360                         iounmap(ahc->bsh.maddr);
1361                         release_mem_region(ahc->platform_data->mem_busaddr,
1362                                            0x1000);
1363                 }
1364
1365                 free(ahc->platform_data, M_DEVBUF);
1366         }
1367 }
1368
1369 void
1370 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1371 {
1372         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1373                                 SCB_GET_CHANNEL(ahc, scb),
1374                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1375                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1376 }
1377
1378 void
1379 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1380                       ahc_queue_alg alg)
1381 {
1382         struct scsi_target *starget;
1383         struct ahc_linux_target *targ;
1384         struct ahc_linux_device *dev;
1385         struct scsi_device *sdev;
1386         u_int target_offset;
1387         int was_queuing;
1388         int now_queuing;
1389
1390         target_offset = devinfo->target;
1391         if (devinfo->channel != 'A')
1392                 target_offset += 8;
1393         starget = ahc->platform_data->starget[target_offset];
1394         targ = scsi_transport_target_data(starget);
1395         BUG_ON(targ == NULL);
1396         sdev = targ->sdev[devinfo->lun];
1397         if (sdev == NULL)
1398                 return;
1399         dev = scsi_transport_device_data(sdev);
1400
1401         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1402         switch (alg) {
1403         default:
1404         case AHC_QUEUE_NONE:
1405                 now_queuing = 0;
1406                 break; 
1407         case AHC_QUEUE_BASIC:
1408                 now_queuing = AHC_DEV_Q_BASIC;
1409                 break;
1410         case AHC_QUEUE_TAGGED:
1411                 now_queuing = AHC_DEV_Q_TAGGED;
1412                 break;
1413         }
1414         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1415          && (was_queuing != now_queuing)
1416          && (dev->active != 0)) {
1417                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1418                 dev->qfrozen++;
1419         }
1420
1421         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1422         if (now_queuing) {
1423                 u_int usertags;
1424
1425                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1426                 if (!was_queuing) {
1427                         /*
1428                          * Start out agressively and allow our
1429                          * dynamic queue depth algorithm to take
1430                          * care of the rest.
1431                          */
1432                         dev->maxtags = usertags;
1433                         dev->openings = dev->maxtags - dev->active;
1434                 }
1435                 if (dev->maxtags == 0) {
1436                         /*
1437                          * Queueing is disabled by the user.
1438                          */
1439                         dev->openings = 1;
1440                 } else if (alg == AHC_QUEUE_TAGGED) {
1441                         dev->flags |= AHC_DEV_Q_TAGGED;
1442                         if (aic7xxx_periodic_otag != 0)
1443                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1444                 } else
1445                         dev->flags |= AHC_DEV_Q_BASIC;
1446         } else {
1447                 /* We can only have one opening. */
1448                 dev->maxtags = 0;
1449                 dev->openings =  1 - dev->active;
1450         }
1451         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1452         case AHC_DEV_Q_BASIC:
1453                 scsi_adjust_queue_depth(sdev,
1454                                         MSG_SIMPLE_TASK,
1455                                         dev->openings + dev->active);
1456                 break;
1457         case AHC_DEV_Q_TAGGED:
1458                 scsi_adjust_queue_depth(sdev,
1459                                         MSG_ORDERED_TASK,
1460                                         dev->openings + dev->active);
1461                 break;
1462         default:
1463                 /*
1464                  * We allow the OS to queue 2 untagged transactions to
1465                  * us at any time even though we can only execute them
1466                  * serially on the controller/device.  This should
1467                  * remove some latency.
1468                  */
1469                 scsi_adjust_queue_depth(sdev,
1470                                         /*NON-TAGGED*/0,
1471                                         /*queue depth*/2);
1472                 break;
1473         }
1474 }
1475
1476 int
1477 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1478                         int lun, u_int tag, role_t role, uint32_t status)
1479 {
1480         return 0;
1481 }
1482
1483 static u_int
1484 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1485 {
1486         static int warned_user;
1487         u_int tags;
1488
1489         tags = 0;
1490         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1491                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1492                         if (warned_user == 0) {
1493
1494                                 printf(KERN_WARNING
1495 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1496 "aic7xxx: for installed controllers. Using defaults\n"
1497 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1498 "aic7xxx: the aic7xxx_osm..c source file.\n");
1499                                 warned_user++;
1500                         }
1501                         tags = AHC_MAX_QUEUE;
1502                 } else {
1503                         adapter_tag_info_t *tag_info;
1504
1505                         tag_info = &aic7xxx_tag_info[ahc->unit];
1506                         tags = tag_info->tag_commands[devinfo->target_offset];
1507                         if (tags > AHC_MAX_QUEUE)
1508                                 tags = AHC_MAX_QUEUE;
1509                 }
1510         }
1511         return (tags);
1512 }
1513
1514 /*
1515  * Determines the queue depth for a given device.
1516  */
1517 static void
1518 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1519 {
1520         struct  ahc_devinfo devinfo;
1521         u_int   tags;
1522         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1523
1524         ahc_compile_devinfo(&devinfo,
1525                             sdev->sdev_target->channel == 0
1526                           ? ahc->our_id : ahc->our_id_b,
1527                             sdev->sdev_target->id, sdev->lun,
1528                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1529                             ROLE_INITIATOR);
1530         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1531         if (tags != 0 && sdev->tagged_supported != 0) {
1532
1533                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1534                 ahc_print_devinfo(ahc, &devinfo);
1535                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1536         } else {
1537                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1538         }
1539 }
1540
1541 static int
1542 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1543                       struct scsi_cmnd *cmd)
1544 {
1545         struct   scb *scb;
1546         struct   hardware_scb *hscb;
1547         struct   ahc_initiator_tinfo *tinfo;
1548         struct   ahc_tmode_tstate *tstate;
1549         uint16_t mask;
1550         struct scb_tailq *untagged_q = NULL;
1551
1552         /*
1553          * Schedule us to run later.  The only reason we are not
1554          * running is because the whole controller Q is frozen.
1555          */
1556         if (ahc->platform_data->qfrozen != 0)
1557                 return SCSI_MLQUEUE_HOST_BUSY;
1558
1559         /*
1560          * We only allow one untagged transaction
1561          * per target in the initiator role unless
1562          * we are storing a full busy target *lun*
1563          * table in SCB space.
1564          */
1565         if (!blk_rq_tagged(cmd->request)
1566             && (ahc->features & AHC_SCB_BTT) == 0) {
1567                 int target_offset;
1568
1569                 target_offset = cmd->device->id + cmd->device->channel * 8;
1570                 untagged_q = &(ahc->untagged_queues[target_offset]);
1571                 if (!TAILQ_EMPTY(untagged_q))
1572                         /* if we're already executing an untagged command
1573                          * we're busy to another */
1574                         return SCSI_MLQUEUE_DEVICE_BUSY;
1575         }
1576
1577         /*
1578          * Get an scb to use.
1579          */
1580         scb = ahc_get_scb(ahc);
1581         if (!scb)
1582                 return SCSI_MLQUEUE_HOST_BUSY;
1583
1584         scb->io_ctx = cmd;
1585         scb->platform_data->dev = dev;
1586         hscb = scb->hscb;
1587         cmd->host_scribble = (char *)scb;
1588
1589         /*
1590          * Fill out basics of the HSCB.
1591          */
1592         hscb->control = 0;
1593         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1594         hscb->lun = cmd->device->lun;
1595         mask = SCB_GET_TARGET_MASK(ahc, scb);
1596         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1597                                     SCB_GET_OUR_ID(scb),
1598                                     SCB_GET_TARGET(ahc, scb), &tstate);
1599         hscb->scsirate = tinfo->scsirate;
1600         hscb->scsioffset = tinfo->curr.offset;
1601         if ((tstate->ultraenb & mask) != 0)
1602                 hscb->control |= ULTRAENB;
1603         
1604         if ((ahc->user_discenable & mask) != 0)
1605                 hscb->control |= DISCENB;
1606         
1607         if ((tstate->auto_negotiate & mask) != 0) {
1608                 scb->flags |= SCB_AUTO_NEGOTIATE;
1609                 scb->hscb->control |= MK_MESSAGE;
1610         }
1611
1612         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1613                 int     msg_bytes;
1614                 uint8_t tag_msgs[2];
1615                 
1616                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1617                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1618                         hscb->control |= tag_msgs[0];
1619                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1620                                 dev->commands_since_idle_or_otag = 0;
1621                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1622                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1623                         hscb->control |= MSG_ORDERED_TASK;
1624                         dev->commands_since_idle_or_otag = 0;
1625                 } else {
1626                         hscb->control |= MSG_SIMPLE_TASK;
1627                 }
1628         }
1629
1630         hscb->cdb_len = cmd->cmd_len;
1631         if (hscb->cdb_len <= 12) {
1632                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1633         } else {
1634                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1635                 scb->flags |= SCB_CDB32_PTR;
1636         }
1637
1638         scb->platform_data->xfer_len = 0;
1639         ahc_set_residual(scb, 0);
1640         ahc_set_sense_residual(scb, 0);
1641         scb->sg_count = 0;
1642         if (cmd->use_sg != 0) {
1643                 struct  ahc_dma_seg *sg;
1644                 struct  scatterlist *cur_seg;
1645                 struct  scatterlist *end_seg;
1646                 int     nseg;
1647
1648                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1649                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1650                                   cmd->sc_data_direction);
1651                 end_seg = cur_seg + nseg;
1652                 /* Copy the segments into the SG list. */
1653                 sg = scb->sg_list;
1654                 /*
1655                  * The sg_count may be larger than nseg if
1656                  * a transfer crosses a 32bit page.
1657                  */ 
1658                 while (cur_seg < end_seg) {
1659                         dma_addr_t addr;
1660                         bus_size_t len;
1661                         int consumed;
1662
1663                         addr = sg_dma_address(cur_seg);
1664                         len = sg_dma_len(cur_seg);
1665                         consumed = ahc_linux_map_seg(ahc, scb,
1666                                                      sg, addr, len);
1667                         sg += consumed;
1668                         scb->sg_count += consumed;
1669                         cur_seg++;
1670                 }
1671                 sg--;
1672                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1673
1674                 /*
1675                  * Reset the sg list pointer.
1676                  */
1677                 scb->hscb->sgptr =
1678                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1679                 
1680                 /*
1681                  * Copy the first SG into the "current"
1682                  * data pointer area.
1683                  */
1684                 scb->hscb->dataptr = scb->sg_list->addr;
1685                 scb->hscb->datacnt = scb->sg_list->len;
1686         } else if (cmd->request_bufflen != 0) {
1687                 struct   ahc_dma_seg *sg;
1688                 dma_addr_t addr;
1689
1690                 sg = scb->sg_list;
1691                 addr = pci_map_single(ahc->dev_softc,
1692                                       cmd->request_buffer,
1693                                       cmd->request_bufflen,
1694                                       cmd->sc_data_direction);
1695                 scb->platform_data->buf_busaddr = addr;
1696                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1697                                                   sg, addr,
1698                                                   cmd->request_bufflen);
1699                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1700
1701                 /*
1702                  * Reset the sg list pointer.
1703                  */
1704                 scb->hscb->sgptr =
1705                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1706
1707                 /*
1708                  * Copy the first SG into the "current"
1709                  * data pointer area.
1710                  */
1711                 scb->hscb->dataptr = sg->addr;
1712                 scb->hscb->datacnt = sg->len;
1713         } else {
1714                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1715                 scb->hscb->dataptr = 0;
1716                 scb->hscb->datacnt = 0;
1717                 scb->sg_count = 0;
1718         }
1719
1720         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1721         dev->openings--;
1722         dev->active++;
1723         dev->commands_issued++;
1724         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1725                 dev->commands_since_idle_or_otag++;
1726         
1727         scb->flags |= SCB_ACTIVE;
1728         if (untagged_q) {
1729                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1730                 scb->flags |= SCB_UNTAGGEDQ;
1731         }
1732         ahc_queue_scb(ahc, scb);
1733         return 0;
1734 }
1735
1736 /*
1737  * SCSI controller interrupt handler.
1738  */
1739 irqreturn_t
1740 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1741 {
1742         struct  ahc_softc *ahc;
1743         u_long  flags;
1744         int     ours;
1745
1746         ahc = (struct ahc_softc *) dev_id;
1747         ahc_lock(ahc, &flags); 
1748         ours = ahc_intr(ahc);
1749         ahc_unlock(ahc, &flags);
1750         return IRQ_RETVAL(ours);
1751 }
1752
1753 void
1754 ahc_platform_flushwork(struct ahc_softc *ahc)
1755 {
1756
1757 }
1758
1759 void
1760 ahc_send_async(struct ahc_softc *ahc, char channel,
1761                u_int target, u_int lun, ac_code code, void *arg)
1762 {
1763         switch (code) {
1764         case AC_TRANSFER_NEG:
1765         {
1766                 char    buf[80];
1767                 struct  scsi_target *starget;
1768                 struct  ahc_linux_target *targ;
1769                 struct  info_str info;
1770                 struct  ahc_initiator_tinfo *tinfo;
1771                 struct  ahc_tmode_tstate *tstate;
1772                 int     target_offset;
1773                 unsigned int target_ppr_options;
1774
1775                 BUG_ON(target == CAM_TARGET_WILDCARD);
1776
1777                 info.buffer = buf;
1778                 info.length = sizeof(buf);
1779                 info.offset = 0;
1780                 info.pos = 0;
1781                 tinfo = ahc_fetch_transinfo(ahc, channel,
1782                                                 channel == 'A' ? ahc->our_id
1783                                                                : ahc->our_id_b,
1784                                                 target, &tstate);
1785
1786                 /*
1787                  * Don't bother reporting results while
1788                  * negotiations are still pending.
1789                  */
1790                 if (tinfo->curr.period != tinfo->goal.period
1791                  || tinfo->curr.width != tinfo->goal.width
1792                  || tinfo->curr.offset != tinfo->goal.offset
1793                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1794                         if (bootverbose == 0)
1795                                 break;
1796
1797                 /*
1798                  * Don't bother reporting results that
1799                  * are identical to those last reported.
1800                  */
1801                 target_offset = target;
1802                 if (channel == 'B')
1803                         target_offset += 8;
1804                 starget = ahc->platform_data->starget[target_offset];
1805                 targ = scsi_transport_target_data(starget);
1806                 if (targ == NULL)
1807                         break;
1808
1809                 target_ppr_options =
1810                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1811                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1812                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1813
1814                 if (tinfo->curr.period == spi_period(starget)
1815                     && tinfo->curr.width == spi_width(starget)
1816                     && tinfo->curr.offset == spi_offset(starget)
1817                  && tinfo->curr.ppr_options == target_ppr_options)
1818                         if (bootverbose == 0)
1819                                 break;
1820
1821                 spi_period(starget) = tinfo->curr.period;
1822                 spi_width(starget) = tinfo->curr.width;
1823                 spi_offset(starget) = tinfo->curr.offset;
1824                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ;
1825                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ;
1826                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ;
1827                 spi_display_xfer_agreement(starget);
1828                 break;
1829         }
1830         case AC_SENT_BDR:
1831         {
1832                 WARN_ON(lun != CAM_LUN_WILDCARD);
1833                 scsi_report_device_reset(ahc->platform_data->host,
1834                                          channel - 'A', target);
1835                 break;
1836         }
1837         case AC_BUS_RESET:
1838                 if (ahc->platform_data->host != NULL) {
1839                         scsi_report_bus_reset(ahc->platform_data->host,
1840                                               channel - 'A');
1841                 }
1842                 break;
1843         default:
1844                 panic("ahc_send_async: Unexpected async event");
1845         }
1846 }
1847
1848 /*
1849  * Calls the higher level scsi done function and frees the scb.
1850  */
1851 void
1852 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1853 {
1854         struct scsi_cmnd *cmd;
1855         struct     ahc_linux_device *dev;
1856
1857         LIST_REMOVE(scb, pending_links);
1858         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1859                 struct scb_tailq *untagged_q;
1860                 int target_offset;
1861
1862                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1863                 untagged_q = &(ahc->untagged_queues[target_offset]);
1864                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1865                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1866         }
1867
1868         if ((scb->flags & SCB_ACTIVE) == 0) {
1869                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1870                 ahc_dump_card_state(ahc);
1871                 panic("Stopping for safety");
1872         }
1873         cmd = scb->io_ctx;
1874         dev = scb->platform_data->dev;
1875         dev->active--;
1876         dev->openings++;
1877         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1878                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1879                 dev->qfrozen--;
1880         }
1881         ahc_linux_unmap_scb(ahc, scb);
1882
1883         /*
1884          * Guard against stale sense data.
1885          * The Linux mid-layer assumes that sense
1886          * was retrieved anytime the first byte of
1887          * the sense buffer looks "sane".
1888          */
1889         cmd->sense_buffer[0] = 0;
1890         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1891                 uint32_t amount_xferred;
1892
1893                 amount_xferred =
1894                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1895                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1896 #ifdef AHC_DEBUG
1897                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1898                                 ahc_print_path(ahc, scb);
1899                                 printf("Set CAM_UNCOR_PARITY\n");
1900                         }
1901 #endif
1902                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1903 #ifdef AHC_REPORT_UNDERFLOWS
1904                 /*
1905                  * This code is disabled by default as some
1906                  * clients of the SCSI system do not properly
1907                  * initialize the underflow parameter.  This
1908                  * results in spurious termination of commands
1909                  * that complete as expected (e.g. underflow is
1910                  * allowed as command can return variable amounts
1911                  * of data.
1912                  */
1913                 } else if (amount_xferred < scb->io_ctx->underflow) {
1914                         u_int i;
1915
1916                         ahc_print_path(ahc, scb);
1917                         printf("CDB:");
1918                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1919                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1920                         printf("\n");
1921                         ahc_print_path(ahc, scb);
1922                         printf("Saw underflow (%ld of %ld bytes). "
1923                                "Treated as error\n",
1924                                 ahc_get_residual(scb),
1925                                 ahc_get_transfer_length(scb));
1926                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1927 #endif
1928                 } else {
1929                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1930                 }
1931         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1932                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1933         }
1934
1935         if (dev->openings == 1
1936          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1937          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1938                 dev->tag_success_count++;
1939         /*
1940          * Some devices deal with temporary internal resource
1941          * shortages by returning queue full.  When the queue
1942          * full occurrs, we throttle back.  Slowly try to get
1943          * back to our previous queue depth.
1944          */
1945         if ((dev->openings + dev->active) < dev->maxtags
1946          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1947                 dev->tag_success_count = 0;
1948                 dev->openings++;
1949         }
1950
1951         if (dev->active == 0)
1952                 dev->commands_since_idle_or_otag = 0;
1953
1954         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1955                 printf("Recovery SCB completes\n");
1956                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1957                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1958                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1959                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
1960                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
1961                         up(&ahc->platform_data->eh_sem);
1962                 }
1963         }
1964
1965         ahc_free_scb(ahc, scb);
1966         ahc_linux_queue_cmd_complete(ahc, cmd);
1967 }
1968
1969 static void
1970 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1971                              struct scsi_device *sdev, struct scb *scb)
1972 {
1973         struct  ahc_devinfo devinfo;
1974         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1975
1976         ahc_compile_devinfo(&devinfo,
1977                             ahc->our_id,
1978                             sdev->sdev_target->id, sdev->lun,
1979                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1980                             ROLE_INITIATOR);
1981         
1982         /*
1983          * We don't currently trust the mid-layer to
1984          * properly deal with queue full or busy.  So,
1985          * when one occurs, we tell the mid-layer to
1986          * unconditionally requeue the command to us
1987          * so that we can retry it ourselves.  We also
1988          * implement our own throttling mechanism so
1989          * we don't clobber the device with too many
1990          * commands.
1991          */
1992         switch (ahc_get_scsi_status(scb)) {
1993         default:
1994                 break;
1995         case SCSI_STATUS_CHECK_COND:
1996         case SCSI_STATUS_CMD_TERMINATED:
1997         {
1998                 struct scsi_cmnd *cmd;
1999
2000                 /*
2001                  * Copy sense information to the OS's cmd
2002                  * structure if it is available.
2003                  */
2004                 cmd = scb->io_ctx;
2005                 if (scb->flags & SCB_SENSE) {
2006                         u_int sense_size;
2007
2008                         sense_size = MIN(sizeof(struct scsi_sense_data)
2009                                        - ahc_get_sense_residual(scb),
2010                                          sizeof(cmd->sense_buffer));
2011                         memcpy(cmd->sense_buffer,
2012                                ahc_get_sense_buf(ahc, scb), sense_size);
2013                         if (sense_size < sizeof(cmd->sense_buffer))
2014                                 memset(&cmd->sense_buffer[sense_size], 0,
2015                                        sizeof(cmd->sense_buffer) - sense_size);
2016                         cmd->result |= (DRIVER_SENSE << 24);
2017 #ifdef AHC_DEBUG
2018                         if (ahc_debug & AHC_SHOW_SENSE) {
2019                                 int i;
2020
2021                                 printf("Copied %d bytes of sense data:",
2022                                        sense_size);
2023                                 for (i = 0; i < sense_size; i++) {
2024                                         if ((i & 0xF) == 0)
2025                                                 printf("\n");
2026                                         printf("0x%x ", cmd->sense_buffer[i]);
2027                                 }
2028                                 printf("\n");
2029                         }
2030 #endif
2031                 }
2032                 break;
2033         }
2034         case SCSI_STATUS_QUEUE_FULL:
2035         {
2036                 /*
2037                  * By the time the core driver has returned this
2038                  * command, all other commands that were queued
2039                  * to us but not the device have been returned.
2040                  * This ensures that dev->active is equal to
2041                  * the number of commands actually queued to
2042                  * the device.
2043                  */
2044                 dev->tag_success_count = 0;
2045                 if (dev->active != 0) {
2046                         /*
2047                          * Drop our opening count to the number
2048                          * of commands currently outstanding.
2049                          */
2050                         dev->openings = 0;
2051 /*
2052                         ahc_print_path(ahc, scb);
2053                         printf("Dropping tag count to %d\n", dev->active);
2054  */
2055                         if (dev->active == dev->tags_on_last_queuefull) {
2056
2057                                 dev->last_queuefull_same_count++;
2058                                 /*
2059                                  * If we repeatedly see a queue full
2060                                  * at the same queue depth, this
2061                                  * device has a fixed number of tag
2062                                  * slots.  Lock in this tag depth
2063                                  * so we stop seeing queue fulls from
2064                                  * this device.
2065                                  */
2066                                 if (dev->last_queuefull_same_count
2067                                  == AHC_LOCK_TAGS_COUNT) {
2068                                         dev->maxtags = dev->active;
2069                                         ahc_print_path(ahc, scb);
2070                                         printf("Locking max tag count at %d\n",
2071                                                dev->active);
2072                                 }
2073                         } else {
2074                                 dev->tags_on_last_queuefull = dev->active;
2075                                 dev->last_queuefull_same_count = 0;
2076                         }
2077                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
2078                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
2079                         ahc_platform_set_tags(ahc, &devinfo,
2080                                      (dev->flags & AHC_DEV_Q_BASIC)
2081                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2082                         break;
2083                 }
2084                 /*
2085                  * Drop down to a single opening, and treat this
2086                  * as if the target returned BUSY SCSI status.
2087                  */
2088                 dev->openings = 1;
2089                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
2090                 ahc_platform_set_tags(ahc, &devinfo,
2091                              (dev->flags & AHC_DEV_Q_BASIC)
2092                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2093                 break;
2094         }
2095         }
2096 }
2097
2098 static void
2099 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
2100 {
2101         /*
2102          * Map CAM error codes into Linux Error codes.  We
2103          * avoid the conversion so that the DV code has the
2104          * full error information available when making
2105          * state change decisions.
2106          */
2107         {
2108                 u_int new_status;
2109
2110                 switch (ahc_cmd_get_transaction_status(cmd)) {
2111                 case CAM_REQ_INPROG:
2112                 case CAM_REQ_CMP:
2113                 case CAM_SCSI_STATUS_ERROR:
2114                         new_status = DID_OK;
2115                         break;
2116                 case CAM_REQ_ABORTED:
2117                         new_status = DID_ABORT;
2118                         break;
2119                 case CAM_BUSY:
2120                         new_status = DID_BUS_BUSY;
2121                         break;
2122                 case CAM_REQ_INVALID:
2123                 case CAM_PATH_INVALID:
2124                         new_status = DID_BAD_TARGET;
2125                         break;
2126                 case CAM_SEL_TIMEOUT:
2127                         new_status = DID_NO_CONNECT;
2128                         break;
2129                 case CAM_SCSI_BUS_RESET:
2130                 case CAM_BDR_SENT:
2131                         new_status = DID_RESET;
2132                         break;
2133                 case CAM_UNCOR_PARITY:
2134                         new_status = DID_PARITY;
2135                         break;
2136                 case CAM_CMD_TIMEOUT:
2137                         new_status = DID_TIME_OUT;
2138                         break;
2139                 case CAM_UA_ABORT:
2140                 case CAM_REQ_CMP_ERR:
2141                 case CAM_AUTOSENSE_FAIL:
2142                 case CAM_NO_HBA:
2143                 case CAM_DATA_RUN_ERR:
2144                 case CAM_UNEXP_BUSFREE:
2145                 case CAM_SEQUENCE_FAIL:
2146                 case CAM_CCB_LEN_ERR:
2147                 case CAM_PROVIDE_FAIL:
2148                 case CAM_REQ_TERMIO:
2149                 case CAM_UNREC_HBA_ERROR:
2150                 case CAM_REQ_TOO_BIG:
2151                         new_status = DID_ERROR;
2152                         break;
2153                 case CAM_REQUEUE_REQ:
2154                         new_status = DID_REQUEUE;
2155                         break;
2156                 default:
2157                         /* We should never get here */
2158                         new_status = DID_ERROR;
2159                         break;
2160                 }
2161
2162                 ahc_cmd_set_transaction_status(cmd, new_status);
2163         }
2164
2165         cmd->scsi_done(cmd);
2166 }
2167
2168 static void
2169 ahc_linux_sem_timeout(u_long arg)
2170 {
2171         struct  ahc_softc *ahc;
2172         u_long  s;
2173
2174         ahc = (struct ahc_softc *)arg;
2175
2176         ahc_lock(ahc, &s);
2177         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2178                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2179                 up(&ahc->platform_data->eh_sem);
2180         }
2181         ahc_unlock(ahc, &s);
2182 }
2183
2184 static void
2185 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2186 {
2187         ahc->platform_data->qfrozen++;
2188         if (ahc->platform_data->qfrozen == 1) {
2189                 scsi_block_requests(ahc->platform_data->host);
2190
2191                 /* XXX What about Twin channels? */
2192                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2193                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2194                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2195         }
2196 }
2197
2198 static void
2199 ahc_linux_release_simq(u_long arg)
2200 {
2201         struct ahc_softc *ahc;
2202         u_long s;
2203         int    unblock_reqs;
2204
2205         ahc = (struct ahc_softc *)arg;
2206
2207         unblock_reqs = 0;
2208         ahc_lock(ahc, &s);
2209         if (ahc->platform_data->qfrozen > 0)
2210                 ahc->platform_data->qfrozen--;
2211         if (ahc->platform_data->qfrozen == 0)
2212                 unblock_reqs = 1;
2213         ahc_unlock(ahc, &s);
2214         /*
2215          * There is still a race here.  The mid-layer
2216          * should keep its own freeze count and use
2217          * a bottom half handler to run the queues
2218          * so we can unblock with our own lock held.
2219          */
2220         if (unblock_reqs)
2221                 scsi_unblock_requests(ahc->platform_data->host);
2222 }
2223
2224 static int
2225 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2226 {
2227         struct ahc_softc *ahc;
2228         struct ahc_linux_device *dev;
2229         struct scb *pending_scb;
2230         u_int  saved_scbptr;
2231         u_int  active_scb_index;
2232         u_int  last_phase;
2233         u_int  saved_scsiid;
2234         u_int  cdb_byte;
2235         int    retval;
2236         int    was_paused;
2237         int    paused;
2238         int    wait;
2239         int    disconnected;
2240
2241         pending_scb = NULL;
2242         paused = FALSE;
2243         wait = FALSE;
2244         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2245
2246         printf("%s:%d:%d:%d: Attempting to queue a%s message\n",
2247                ahc_name(ahc), cmd->device->channel,
2248                cmd->device->id, cmd->device->lun,
2249                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2250
2251         printf("CDB:");
2252         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2253                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2254         printf("\n");
2255
2256         spin_lock_irq(&ahc->platform_data->spin_lock);
2257
2258         /*
2259          * First determine if we currently own this command.
2260          * Start by searching the device queue.  If not found
2261          * there, check the pending_scb list.  If not found
2262          * at all, and the system wanted us to just abort the
2263          * command, return success.
2264          */
2265         dev = scsi_transport_device_data(cmd->device);
2266
2267         if (dev == NULL) {
2268                 /*
2269                  * No target device for this command exists,
2270                  * so we must not still own the command.
2271                  */
2272                 printf("%s:%d:%d:%d: Is not an active device\n",
2273                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2274                        cmd->device->lun);
2275                 retval = SUCCESS;
2276                 goto no_cmd;
2277         }
2278
2279         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2280          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2281                                        cmd->device->channel + 'A',
2282                                        cmd->device->lun,
2283                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2284                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2285                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2286                        cmd->device->lun);
2287                 retval = SUCCESS;
2288                 goto done;
2289         }
2290
2291         /*
2292          * See if we can find a matching cmd in the pending list.
2293          */
2294         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2295                 if (pending_scb->io_ctx == cmd)
2296                         break;
2297         }
2298
2299         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2300
2301                 /* Any SCB for this device will do for a target reset */
2302                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2303                         if (ahc_match_scb(ahc, pending_scb, cmd->device->id,
2304                                           cmd->device->channel + 'A',
2305                                           CAM_LUN_WILDCARD,
2306                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2307                                 break;
2308                 }
2309         }
2310
2311         if (pending_scb == NULL) {
2312                 printf("%s:%d:%d:%d: Command not found\n",
2313                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2314                        cmd->device->lun);
2315                 goto no_cmd;
2316         }
2317
2318         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2319                 /*
2320                  * We can't queue two recovery actions using the same SCB
2321                  */
2322                 retval = FAILED;
2323                 goto  done;
2324         }
2325
2326         /*
2327          * Ensure that the card doesn't do anything
2328          * behind our back and that we didn't "just" miss
2329          * an interrupt that would affect this cmd.
2330          */
2331         was_paused = ahc_is_paused(ahc);
2332         ahc_pause_and_flushwork(ahc);
2333         paused = TRUE;
2334
2335         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2336                 printf("%s:%d:%d:%d: Command already completed\n",
2337                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2338                        cmd->device->lun);
2339                 goto no_cmd;
2340         }
2341
2342         printf("%s: At time of recovery, card was %spaused\n",
2343                ahc_name(ahc), was_paused ? "" : "not ");
2344         ahc_dump_card_state(ahc);
2345
2346         disconnected = TRUE;
2347         if (flag == SCB_ABORT) {
2348                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2349                                        cmd->device->channel + 'A',
2350                                        cmd->device->lun,
2351                                        pending_scb->hscb->tag,
2352                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2353                                        SEARCH_COMPLETE) > 0) {
2354                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2355                                ahc_name(ahc), cmd->device->channel,
2356                                         cmd->device->id, cmd->device->lun);
2357                         retval = SUCCESS;
2358                         goto done;
2359                 }
2360         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2361                                       cmd->device->channel + 'A',
2362                                       cmd->device->lun, pending_scb->hscb->tag,
2363                                       ROLE_INITIATOR, /*status*/0,
2364                                       SEARCH_COUNT) > 0) {
2365                 disconnected = FALSE;
2366         }
2367
2368         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2369                 struct scb *bus_scb;
2370
2371                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2372                 if (bus_scb == pending_scb)
2373                         disconnected = FALSE;
2374                 else if (flag != SCB_ABORT
2375                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2376                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2377                         disconnected = FALSE;
2378         }
2379
2380         /*
2381          * At this point, pending_scb is the scb associated with the
2382          * passed in command.  That command is currently active on the
2383          * bus, is in the disconnected state, or we're hoping to find
2384          * a command for the same target active on the bus to abuse to
2385          * send a BDR.  Queue the appropriate message based on which of
2386          * these states we are in.
2387          */
2388         last_phase = ahc_inb(ahc, LASTPHASE);
2389         saved_scbptr = ahc_inb(ahc, SCBPTR);
2390         active_scb_index = ahc_inb(ahc, SCB_TAG);
2391         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2392         if (last_phase != P_BUSFREE
2393          && (pending_scb->hscb->tag == active_scb_index
2394           || (flag == SCB_DEVICE_RESET
2395            && SCSIID_TARGET(ahc, saved_scsiid) == cmd->device->id))) {
2396
2397                 /*
2398                  * We're active on the bus, so assert ATN
2399                  * and hope that the target responds.
2400                  */
2401                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2402                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2403                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2404                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2405                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
2406                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2407                        cmd->device->lun);
2408                 wait = TRUE;
2409         } else if (disconnected) {
2410
2411                 /*
2412                  * Actually re-queue this SCB in an attempt
2413                  * to select the device before it reconnects.
2414                  * In either case (selection or reselection),
2415                  * we will now issue the approprate message
2416                  * to the timed-out device.
2417                  *
2418                  * Set the MK_MESSAGE control bit indicating
2419                  * that we desire to send a message.  We
2420                  * also set the disconnected flag since
2421                  * in the paging case there is no guarantee
2422                  * that our SCB control byte matches the
2423                  * version on the card.  We don't want the
2424                  * sequencer to abort the command thinking
2425                  * an unsolicited reselection occurred.
2426                  */
2427                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2428                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2429
2430                 /*
2431                  * Remove any cached copy of this SCB in the
2432                  * disconnected list in preparation for the
2433                  * queuing of our abort SCB.  We use the
2434                  * same element in the SCB, SCB_NEXT, for
2435                  * both the qinfifo and the disconnected list.
2436                  */
2437                 ahc_search_disc_list(ahc, cmd->device->id,
2438                                      cmd->device->channel + 'A',
2439                                      cmd->device->lun, pending_scb->hscb->tag,
2440                                      /*stop_on_first*/TRUE,
2441                                      /*remove*/TRUE,
2442                                      /*save_state*/FALSE);
2443
2444                 /*
2445                  * In the non-paging case, the sequencer will
2446                  * never re-reference the in-core SCB.
2447                  * To make sure we are notified during
2448                  * reslection, set the MK_MESSAGE flag in
2449                  * the card's copy of the SCB.
2450                  */
2451                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2452                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2453                         ahc_outb(ahc, SCB_CONTROL,
2454                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2455                 }
2456
2457                 /*
2458                  * Clear out any entries in the QINFIFO first
2459                  * so we are the next SCB for this target
2460                  * to run.
2461                  */
2462                 ahc_search_qinfifo(ahc, cmd->device->id,
2463                                    cmd->device->channel + 'A',
2464                                    cmd->device->lun, SCB_LIST_NULL,
2465                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2466                                    SEARCH_COMPLETE);
2467                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2468                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2469                 ahc_print_path(ahc, pending_scb);
2470                 printf("Device is disconnected, re-queuing SCB\n");
2471                 wait = TRUE;
2472         } else {
2473                 printf("%s:%d:%d:%d: Unable to deliver message\n",
2474                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2475                        cmd->device->lun);
2476                 retval = FAILED;
2477                 goto done;
2478         }
2479
2480 no_cmd:
2481         /*
2482          * Our assumption is that if we don't have the command, no
2483          * recovery action was required, so we return success.  Again,
2484          * the semantics of the mid-layer recovery engine are not
2485          * well defined, so this may change in time.
2486          */
2487         retval = SUCCESS;
2488 done:
2489         if (paused)
2490                 ahc_unpause(ahc);
2491         if (wait) {
2492                 struct timer_list timer;
2493                 int ret;
2494
2495                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2496                 spin_unlock_irq(&ahc->platform_data->spin_lock);
2497                 init_timer(&timer);
2498                 timer.data = (u_long)ahc;
2499                 timer.expires = jiffies + (5 * HZ);
2500                 timer.function = ahc_linux_sem_timeout;
2501                 add_timer(&timer);
2502                 printf("Recovery code sleeping\n");
2503                 down(&ahc->platform_data->eh_sem);
2504                 printf("Recovery code awake\n");
2505                 ret = del_timer_sync(&timer);
2506                 if (ret == 0) {
2507                         printf("Timer Expired\n");
2508                         retval = FAILED;
2509                 }
2510                 spin_lock_irq(&ahc->platform_data->spin_lock);
2511         }
2512
2513         spin_unlock_irq(&ahc->platform_data->spin_lock);
2514         return (retval);
2515 }
2516
2517 void
2518 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2519 {
2520 }
2521
2522 static void ahc_linux_exit(void);
2523
2524 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2525 {
2526         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2527         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2528         struct ahc_devinfo devinfo;
2529         unsigned long flags;
2530
2531         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2532                             starget->channel + 'A', ROLE_INITIATOR);
2533         ahc_lock(ahc, &flags);
2534         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2535         ahc_unlock(ahc, &flags);
2536 }
2537
2538 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2539 {
2540         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2541         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2542         struct ahc_tmode_tstate *tstate;
2543         struct ahc_initiator_tinfo *tinfo 
2544                 = ahc_fetch_transinfo(ahc,
2545                                       starget->channel + 'A',
2546                                       shost->this_id, starget->id, &tstate);
2547         struct ahc_devinfo devinfo;
2548         unsigned int ppr_options = tinfo->goal.ppr_options;
2549         unsigned long flags;
2550         unsigned long offset = tinfo->goal.offset;
2551         struct ahc_syncrate *syncrate;
2552
2553         if (offset == 0)
2554                 offset = MAX_OFFSET;
2555
2556         if (period < 9)
2557                 period = 9;     /* 12.5ns is our minimum */
2558         if (period == 9)
2559                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2560
2561         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2562                             starget->channel + 'A', ROLE_INITIATOR);
2563
2564         /* all PPR requests apart from QAS require wide transfers */
2565         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2566                 if (spi_width(starget) == 0)
2567                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2568         }
2569
2570         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2571         ahc_lock(ahc, &flags);
2572         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2573                          ppr_options, AHC_TRANS_GOAL, FALSE);
2574         ahc_unlock(ahc, &flags);
2575 }
2576
2577 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2578 {
2579         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2580         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2581         struct ahc_tmode_tstate *tstate;
2582         struct ahc_initiator_tinfo *tinfo 
2583                 = ahc_fetch_transinfo(ahc,
2584                                       starget->channel + 'A',
2585                                       shost->this_id, starget->id, &tstate);
2586         struct ahc_devinfo devinfo;
2587         unsigned int ppr_options = 0;
2588         unsigned int period = 0;
2589         unsigned long flags;
2590         struct ahc_syncrate *syncrate = NULL;
2591
2592         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2593                             starget->channel + 'A', ROLE_INITIATOR);
2594         if (offset != 0) {
2595                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2596                 period = tinfo->goal.period;
2597                 ppr_options = tinfo->goal.ppr_options;
2598         }
2599         ahc_lock(ahc, &flags);
2600         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2601                          ppr_options, AHC_TRANS_GOAL, FALSE);
2602         ahc_unlock(ahc, &flags);
2603 }
2604
2605 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2606 {
2607         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2608         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2609         struct ahc_tmode_tstate *tstate;
2610         struct ahc_initiator_tinfo *tinfo 
2611                 = ahc_fetch_transinfo(ahc,
2612                                       starget->channel + 'A',
2613                                       shost->this_id, starget->id, &tstate);
2614         struct ahc_devinfo devinfo;
2615         unsigned int ppr_options = tinfo->goal.ppr_options
2616                 & ~MSG_EXT_PPR_DT_REQ;
2617         unsigned int period = tinfo->goal.period;
2618         unsigned long flags;
2619         struct ahc_syncrate *syncrate;
2620
2621         if (dt) {
2622                 period = 9;     /* 12.5ns is the only period valid for DT */
2623                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2624         } else if (period == 9)
2625                 period = 10;    /* if resetting DT, period must be >= 25ns */
2626
2627         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2628                             starget->channel + 'A', ROLE_INITIATOR);
2629         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2630         ahc_lock(ahc, &flags);
2631         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2632                          ppr_options, AHC_TRANS_GOAL, FALSE);
2633         ahc_unlock(ahc, &flags);
2634 }
2635
2636 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2637 {
2638         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2639         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2640         struct ahc_tmode_tstate *tstate;
2641         struct ahc_initiator_tinfo *tinfo 
2642                 = ahc_fetch_transinfo(ahc,
2643                                       starget->channel + 'A',
2644                                       shost->this_id, starget->id, &tstate);
2645         struct ahc_devinfo devinfo;
2646         unsigned int ppr_options = tinfo->goal.ppr_options
2647                 & ~MSG_EXT_PPR_QAS_REQ;
2648         unsigned int period = tinfo->goal.period;
2649         unsigned long flags;
2650         struct ahc_syncrate *syncrate;
2651
2652         if (qas)
2653                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2654
2655         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2656                             starget->channel + 'A', ROLE_INITIATOR);
2657         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2658         ahc_lock(ahc, &flags);
2659         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2660                          ppr_options, AHC_TRANS_GOAL, FALSE);
2661         ahc_unlock(ahc, &flags);
2662 }
2663
2664 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2665 {
2666         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2667         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2668         struct ahc_tmode_tstate *tstate;
2669         struct ahc_initiator_tinfo *tinfo 
2670                 = ahc_fetch_transinfo(ahc,
2671                                       starget->channel + 'A',
2672                                       shost->this_id, starget->id, &tstate);
2673         struct ahc_devinfo devinfo;
2674         unsigned int ppr_options = tinfo->goal.ppr_options
2675                 & ~MSG_EXT_PPR_IU_REQ;
2676         unsigned int period = tinfo->goal.period;
2677         unsigned long flags;
2678         struct ahc_syncrate *syncrate;
2679
2680         if (iu)
2681                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2682
2683         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2684                             starget->channel + 'A', ROLE_INITIATOR);
2685         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2686         ahc_lock(ahc, &flags);
2687         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2688                          ppr_options, AHC_TRANS_GOAL, FALSE);
2689         ahc_unlock(ahc, &flags);
2690 }
2691
2692 static struct spi_function_template ahc_linux_transport_functions = {
2693         .set_offset     = ahc_linux_set_offset,
2694         .show_offset    = 1,
2695         .set_period     = ahc_linux_set_period,
2696         .show_period    = 1,
2697         .set_width      = ahc_linux_set_width,
2698         .show_width     = 1,
2699         .set_dt         = ahc_linux_set_dt,
2700         .show_dt        = 1,
2701         .set_iu         = ahc_linux_set_iu,
2702         .show_iu        = 1,
2703         .set_qas        = ahc_linux_set_qas,
2704         .show_qas       = 1,
2705 };
2706
2707
2708
2709 static int __init
2710 ahc_linux_init(void)
2711 {
2712         ahc_linux_transport_template = spi_attach_transport(&ahc_linux_transport_functions);
2713         if (!ahc_linux_transport_template)
2714                 return -ENODEV;
2715         scsi_transport_reserve_target(ahc_linux_transport_template,
2716                                       sizeof(struct ahc_linux_target));
2717         scsi_transport_reserve_device(ahc_linux_transport_template,
2718                                       sizeof(struct ahc_linux_device));
2719         if (ahc_linux_detect(&aic7xxx_driver_template))
2720                 return 0;
2721         spi_release_transport(ahc_linux_transport_template);
2722         ahc_linux_exit();
2723         return -ENODEV;
2724 }
2725
2726 static void
2727 ahc_linux_exit(void)
2728 {
2729         ahc_linux_pci_exit();
2730         ahc_linux_eisa_exit();
2731         spi_release_transport(ahc_linux_transport_template);
2732 }
2733
2734 module_init(ahc_linux_init);
2735 module_exit(ahc_linux_exit);