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aic7xxx_osm.c
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1 /*
2  * Adaptec AIC7xxx device driver for Linux.
3  *
4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
5  *
6  * Copyright (c) 1994 John Aycock
7  * The University of Calgary Department of Computer Science.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2, or (at your option)
12  * any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; see the file COPYING. If not, write to
21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
22  *
23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
30  * ANSI SCSI-2 specification (draft 10c), ...
31  *
32  * --------------------------------------------------------------------------
33  *
34  * Modifications by Daniel M. Eischen ([email protected]):
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, [email protected], 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 <[email protected]>
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 #include <linux/init.h> /* __setup */
129 #include <linux/mm.h> /* For fetching system memory size */
130 #include <linux/blkdev.h> /* For block_size() */
131 #include <linux/delay.h> /* For ssleep/msleep */
132 #include <linux/slab.h>
133 
134 
135 /*
136  * Set this to the delay in seconds after SCSI bus reset.
137  * Note, we honor this only for the initial bus reset.
138  * The scsi error recovery code performs its own bus settle
139  * delay handling for error recovery actions.
140  */
141 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
142 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
143 #else
144 #define AIC7XXX_RESET_DELAY 5000
145 #endif
146 
147 /*
148  * Control collection of SCSI transfer statistics for the /proc filesystem.
149  *
150  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
151  * NOTE: This does affect performance since it has to maintain statistics.
152  */
153 #ifdef CONFIG_AIC7XXX_PROC_STATS
154 #define AIC7XXX_PROC_STATS
155 #endif
156 
157 /*
158  * To change the default number of tagged transactions allowed per-device,
159  * add a line to the lilo.conf file like:
160  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
161  * which will result in the first four devices on the first two
162  * controllers being set to a tagged queue depth of 32.
163  *
164  * The tag_commands is an array of 16 to allow for wide and twin adapters.
165  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
166  * for channel 1.
167  */
168 typedef struct {
169  uint8_t tag_commands[16]; /* Allow for wide/twin adapters. */
170 } adapter_tag_info_t;
171 
172 /*
173  * Modify this as you see fit for your system.
174  *
175  * 0 tagged queuing disabled
176  * 1 <= n <= 253 n == max tags ever dispatched.
177  *
178  * The driver will throttle the number of commands dispatched to a
179  * device if it returns queue full. For devices with a fixed maximum
180  * queue depth, the driver will eventually determine this depth and
181  * lock it in (a console message is printed to indicate that a lock
182  * has occurred). On some devices, queue full is returned for a temporary
183  * resource shortage. These devices will return queue full at varying
184  * depths. The driver will throttle back when the queue fulls occur and
185  * attempt to slowly increase the depth over time as the device recovers
186  * from the resource shortage.
187  *
188  * In this example, the first line will disable tagged queueing for all
189  * the devices on the first probed aic7xxx adapter.
190  *
191  * The second line enables tagged queueing with 4 commands/LUN for IDs
192  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
193  * driver to attempt to use up to 64 tags for ID 1.
194  *
195  * The third line is the same as the first line.
196  *
197  * The fourth line disables tagged queueing for devices 0 and 3. It
198  * enables tagged queueing for the other IDs, with 16 commands/LUN
199  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
200  * IDs 2, 5-7, and 9-15.
201  */
202 
203 /*
204  * NOTE: The below structure is for reference only, the actual structure
205  * to modify in order to change things is just below this comment block.
206 adapter_tag_info_t aic7xxx_tag_info[] =
207 {
208  {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
209  {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
210  {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
211  {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
212 };
213 */
214 
215 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
216 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
217 #else
218 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
219 #endif
220 
221 #define AIC7XXX_CONFIGED_TAG_COMMANDS { \
222  AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
223  AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
224  AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
225  AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
226  AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
227  AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
228  AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
229  AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE \
230 }
231 
232 /*
233  * By default, use the number of commands specified by
234  * the users kernel configuration.
235  */
236 static adapter_tag_info_t aic7xxx_tag_info[] =
237 {
238  {AIC7XXX_CONFIGED_TAG_COMMANDS},
239  {AIC7XXX_CONFIGED_TAG_COMMANDS},
240  {AIC7XXX_CONFIGED_TAG_COMMANDS},
241  {AIC7XXX_CONFIGED_TAG_COMMANDS},
242  {AIC7XXX_CONFIGED_TAG_COMMANDS},
243  {AIC7XXX_CONFIGED_TAG_COMMANDS},
244  {AIC7XXX_CONFIGED_TAG_COMMANDS},
245  {AIC7XXX_CONFIGED_TAG_COMMANDS},
246  {AIC7XXX_CONFIGED_TAG_COMMANDS},
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 };
255 
256 /*
257  * There should be a specific return value for this in scsi.h, but
258  * it seems that most drivers ignore it.
259  */
260 #define DID_UNDERFLOW DID_ERROR
261 
262 void
263 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
264 {
265  printk("(scsi%d:%c:%d:%d): ",
266  ahc->platform_data->host->host_no,
267  scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
268  scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
269  scb != NULL ? SCB_GET_LUN(scb) : -1);
270 }
271 
272 /*
273  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
274  * cards in the system. This should be fixed. Exceptions to this
275  * rule are noted in the comments.
276  */
277 
278 /*
279  * Skip the scsi bus reset. Non 0 make us skip the reset at startup. This
280  * has no effect on any later resets that might occur due to things like
281  * SCSI bus timeouts.
282  */
283 static uint32_t aic7xxx_no_reset;
284 
285 /*
286  * Should we force EXTENDED translation on a controller.
287  * 0 == Use whatever is in the SEEPROM or default to off
288  * 1 == Use whatever is in the SEEPROM or default to on
289  */
290 static uint32_t aic7xxx_extended;
291 
292 /*
293  * PCI bus parity checking of the Adaptec controllers. This is somewhat
294  * dubious at best. To my knowledge, this option has never actually
295  * solved a PCI parity problem, but on certain machines with broken PCI
296  * chipset configurations where stray PCI transactions with bad parity are
297  * the norm rather than the exception, the error messages can be overwhelming.
298  * It's included in the driver for completeness.
299  * 0 = Shut off PCI parity check
300  * non-0 = reverse polarity pci parity checking
301  */
302 static uint32_t aic7xxx_pci_parity = ~0;
303 
304 /*
305  * There are lots of broken chipsets in the world. Some of them will
306  * violate the PCI spec when we issue byte sized memory writes to our
307  * controller. I/O mapped register access, if allowed by the given
308  * platform, will work in almost all cases.
309  */
310 uint32_t aic7xxx_allow_memio = ~0;
311 
312 /*
313  * So that we can set how long each device is given as a selection timeout.
314  * The table of values goes like this:
315  * 0 - 256ms
316  * 1 - 128ms
317  * 2 - 64ms
318  * 3 - 32ms
319  * We default to 256ms because some older devices need a longer time
320  * to respond to initial selection.
321  */
322 static uint32_t aic7xxx_seltime;
323 
324 /*
325  * Certain devices do not perform any aging on commands. Should the
326  * device be saturated by commands in one portion of the disk, it is
327  * possible for transactions on far away sectors to never be serviced.
328  * To handle these devices, we can periodically send an ordered tag to
329  * force all outstanding transactions to be serviced prior to a new
330  * transaction.
331  */
332 static uint32_t aic7xxx_periodic_otag;
333 
334 /*
335  * Module information and settable options.
336  */
337 static char *aic7xxx = NULL;
338 
339 MODULE_AUTHOR("Maintainer: Hannes Reinecke <[email protected]>");
340 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
341 MODULE_LICENSE("Dual BSD/GPL");
342 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
343 module_param(aic7xxx, charp, 0444);
344 MODULE_PARM_DESC(aic7xxx,
345 "period-delimited options string:\n"
346 " verbose Enable verbose/diagnostic logging\n"
347 " allow_memio Allow device registers to be memory mapped\n"
348 " debug Bitmask of debug values to enable\n"
349 " no_probe Toggle EISA/VLB controller probing\n"
350 " probe_eisa_vl Toggle EISA/VLB controller probing\n"
351 " no_reset Suppress initial bus resets\n"
352 " extended Enable extended geometry on all controllers\n"
353 " periodic_otag Send an ordered tagged transaction\n"
354 " periodically to prevent tag starvation.\n"
355 " This may be required by some older disk\n"
356 " drives or RAID arrays.\n"
357 " tag_info:<tag_str> Set per-target tag depth\n"
358 " global_tag_depth:<int> Global tag depth for every target\n"
359 " on every bus\n"
360 " seltime:<int> Selection Timeout\n"
361 " (0/256ms,1/128ms,2/64ms,3/32ms)\n"
362 "\n"
363 " Sample modprobe configuration file:\n"
364 " # Toggle EISA/VLB probing\n"
365 " # Set tag depth on Controller 1/Target 1 to 10 tags\n"
366 " # Shorten the selection timeout to 128ms\n"
367 "\n"
368 " options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
369 );
370 
371 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
372  struct scsi_device *,
373  struct scb *);
374 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
375  struct scsi_cmnd *cmd);
376 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
377 static void ahc_linux_release_simq(struct ahc_softc *ahc);
378 static int ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
379 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
380 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
381  struct ahc_devinfo *devinfo);
382 static void ahc_linux_device_queue_depth(struct scsi_device *);
383 static int ahc_linux_run_command(struct ahc_softc*,
384  struct ahc_linux_device *,
385  struct scsi_cmnd *);
386 static void ahc_linux_setup_tag_info_global(char *p);
387 static int aic7xxx_setup(char *s);
388 
389 static int ahc_linux_unit;
390 
391 
392 /************************** OS Utility Wrappers *******************************/
393 void
394 ahc_delay(long usec)
395 {
396  /*
397  * udelay on Linux can have problems for
398  * multi-millisecond waits. Wait at most
399  * 1024us per call.
400  */
401  while (usec > 0) {
402  udelay(usec % 1024);
403  usec -= 1024;
404  }
405 }
406 
407 /***************************** Low Level I/O **********************************/
408 uint8_t
409 ahc_inb(struct ahc_softc * ahc, long port)
410 {
411  uint8_t x;
412 
413  if (ahc->tag == BUS_SPACE_MEMIO) {
414  x = readb(ahc->bsh.maddr + port);
415  } else {
416  x = inb(ahc->bsh.ioport + port);
417  }
418  mb();
419  return (x);
420 }
421 
422 void
423 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
424 {
425  if (ahc->tag == BUS_SPACE_MEMIO) {
426  writeb(val, ahc->bsh.maddr + port);
427  } else {
428  outb(val, ahc->bsh.ioport + port);
429  }
430  mb();
431 }
432 
433 void
434 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
435 {
436  int i;
437 
438  /*
439  * There is probably a more efficient way to do this on Linux
440  * but we don't use this for anything speed critical and this
441  * should work.
442  */
443  for (i = 0; i < count; i++)
444  ahc_outb(ahc, port, *array++);
445 }
446 
447 void
448 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
449 {
450  int i;
451 
452  /*
453  * There is probably a more efficient way to do this on Linux
454  * but we don't use this for anything speed critical and this
455  * should work.
456  */
457  for (i = 0; i < count; i++)
458  *array++ = ahc_inb(ahc, port);
459 }
460 
461 /********************************* Inlines ************************************/
462 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
463 
464 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
465  struct ahc_dma_seg *sg,
466  dma_addr_t addr, bus_size_t len);
467 
468 static void
469 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
470 {
471  struct scsi_cmnd *cmd;
472 
473  cmd = scb->io_ctx;
474  ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
475 
476  scsi_dma_unmap(cmd);
477 }
478 
479 static int
480 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
481  struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
482 {
483  int consumed;
484 
485  if ((scb->sg_count + 1) > AHC_NSEG)
486  panic("Too few segs for dma mapping. "
487  "Increase AHC_NSEG\n");
488 
489  consumed = 1;
490  sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
491  scb->platform_data->xfer_len += len;
492 
493  if (sizeof(dma_addr_t) > 4
494  && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
495  len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
496 
497  sg->len = ahc_htole32(len);
498  return (consumed);
499 }
500 
501 /*
502  * Return a string describing the driver.
503  */
504 static const char *
505 ahc_linux_info(struct Scsi_Host *host)
506 {
507  static char buffer[512];
508  char ahc_info[256];
509  char *bp;
510  struct ahc_softc *ahc;
511 
512  bp = &buffer[0];
513  ahc = *(struct ahc_softc **)host->hostdata;
514  memset(bp, 0, sizeof(buffer));
515  strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
516  " <");
517  strcat(bp, ahc->description);
518  strcat(bp, ">\n"
519  " ");
520  ahc_controller_info(ahc, ahc_info);
521  strcat(bp, ahc_info);
522  strcat(bp, "\n");
523 
524  return (bp);
525 }
526 
527 /*
528  * Queue an SCB to the controller.
529  */
530 static int
531 ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
532 {
533  struct ahc_softc *ahc;
534  struct ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
535  int rtn = SCSI_MLQUEUE_HOST_BUSY;
536  unsigned long flags;
537 
538  ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
539 
540  ahc_lock(ahc, &flags);
541  if (ahc->platform_data->qfrozen == 0) {
542  cmd->scsi_done = scsi_done;
543  cmd->result = CAM_REQ_INPROG << 16;
544  rtn = ahc_linux_run_command(ahc, dev, cmd);
545  }
546  ahc_unlock(ahc, &flags);
547 
548  return rtn;
549 }
550 
551 static DEF_SCSI_QCMD(ahc_linux_queue)
552 
553 static inline struct scsi_target **
554 ahc_linux_target_in_softc(struct scsi_target *starget)
555 {
556  struct ahc_softc *ahc =
557  *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
558  unsigned int target_offset;
559 
560  target_offset = starget->id;
561  if (starget->channel != 0)
562  target_offset += 8;
563 
564  return &ahc->platform_data->starget[target_offset];
565 }
566 
567 static int
568 ahc_linux_target_alloc(struct scsi_target *starget)
569 {
570  struct ahc_softc *ahc =
571  *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
572  struct seeprom_config *sc = ahc->seep_config;
573  unsigned long flags;
574  struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
575  unsigned short scsirate;
576  struct ahc_devinfo devinfo;
577  struct ahc_initiator_tinfo *tinfo;
578  struct ahc_tmode_tstate *tstate;
579  char channel = starget->channel + 'A';
580  unsigned int our_id = ahc->our_id;
581  unsigned int target_offset;
582 
583  target_offset = starget->id;
584  if (starget->channel != 0)
585  target_offset += 8;
586 
587  if (starget->channel)
588  our_id = ahc->our_id_b;
589 
590  ahc_lock(ahc, &flags);
591 
592  BUG_ON(*ahc_targp != NULL);
593 
594  *ahc_targp = starget;
595 
596  if (sc) {
597  int maxsync = AHC_SYNCRATE_DT;
598  int ultra = 0;
599  int flags = sc->device_flags[target_offset];
600 
601  if (ahc->flags & AHC_NEWEEPROM_FMT) {
602  if (flags & CFSYNCHISULTRA)
603  ultra = 1;
604  } else if (flags & CFULTRAEN)
605  ultra = 1;
606  /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
607  * change it to ultra=0, CFXFER = 0 */
608  if(ultra && (flags & CFXFER) == 0x04) {
609  ultra = 0;
610  flags &= ~CFXFER;
611  }
612 
613  if ((ahc->features & AHC_ULTRA2) != 0) {
614  scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
615  } else {
616  scsirate = (flags & CFXFER) << 4;
617  maxsync = ultra ? AHC_SYNCRATE_ULTRA :
618  AHC_SYNCRATE_FAST;
619  }
620  spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
621  if (!(flags & CFSYNCH))
622  spi_max_offset(starget) = 0;
623  spi_min_period(starget) =
624  ahc_find_period(ahc, scsirate, maxsync);
625 
626  tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
627  starget->id, &tstate);
628  }
629  ahc_compile_devinfo(&devinfo, our_id, starget->id,
630  CAM_LUN_WILDCARD, channel,
631  ROLE_INITIATOR);
632  ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
633  AHC_TRANS_GOAL, /*paused*/FALSE);
634  ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
635  AHC_TRANS_GOAL, /*paused*/FALSE);
636  ahc_unlock(ahc, &flags);
637 
638  return 0;
639 }
640 
641 static void
642 ahc_linux_target_destroy(struct scsi_target *starget)
643 {
644  struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
645 
646  *ahc_targp = NULL;
647 }
648 
649 static int
650 ahc_linux_slave_alloc(struct scsi_device *sdev)
651 {
652  struct ahc_softc *ahc =
653  *((struct ahc_softc **)sdev->host->hostdata);
654  struct scsi_target *starget = sdev->sdev_target;
655  struct ahc_linux_device *dev;
656 
657  if (bootverbose)
658  printk("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
659 
660  dev = scsi_transport_device_data(sdev);
661  memset(dev, 0, sizeof(*dev));
662 
663  /*
664  * We start out life using untagged
665  * transactions of which we allow one.
666  */
667  dev->openings = 1;
668 
669  /*
670  * Set maxtags to 0. This will be changed if we
671  * later determine that we are dealing with
672  * a tagged queuing capable device.
673  */
674  dev->maxtags = 0;
675 
676  spi_period(starget) = 0;
677 
678  return 0;
679 }
680 
681 static int
682 ahc_linux_slave_configure(struct scsi_device *sdev)
683 {
684  struct ahc_softc *ahc;
685 
686  ahc = *((struct ahc_softc **)sdev->host->hostdata);
687 
688  if (bootverbose)
689  sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
690 
691  ahc_linux_device_queue_depth(sdev);
692 
693  /* Initial Domain Validation */
694  if (!spi_initial_dv(sdev->sdev_target))
695  spi_dv_device(sdev);
696 
697  return 0;
698 }
699 
700 #if defined(__i386__)
701 /*
702  * Return the disk geometry for the given SCSI device.
703  */
704 static int
705 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
706  sector_t capacity, int geom[])
707 {
708  uint8_t *bh;
709  int heads;
710  int sectors;
711  int cylinders;
712  int ret;
713  int extended;
714  struct ahc_softc *ahc;
715  u_int channel;
716 
717  ahc = *((struct ahc_softc **)sdev->host->hostdata);
718  channel = sdev_channel(sdev);
719 
720  bh = scsi_bios_ptable(bdev);
721  if (bh) {
722  ret = scsi_partsize(bh, capacity,
723  &geom[2], &geom[0], &geom[1]);
724  kfree(bh);
725  if (ret != -1)
726  return (ret);
727  }
728  heads = 64;
729  sectors = 32;
730  cylinders = aic_sector_div(capacity, heads, sectors);
731 
732  if (aic7xxx_extended != 0)
733  extended = 1;
734  else if (channel == 0)
735  extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
736  else
737  extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
738  if (extended && cylinders >= 1024) {
739  heads = 255;
740  sectors = 63;
741  cylinders = aic_sector_div(capacity, heads, sectors);
742  }
743  geom[0] = heads;
744  geom[1] = sectors;
745  geom[2] = cylinders;
746  return (0);
747 }
748 #endif
749 
750 /*
751  * Abort the current SCSI command(s).
752  */
753 static int
754 ahc_linux_abort(struct scsi_cmnd *cmd)
755 {
756  int error;
757 
758  error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
759  if (error != 0)
760  printk("aic7xxx_abort returns 0x%x\n", error);
761  return (error);
762 }
763 
764 /*
765  * Attempt to send a target reset message to the device that timed out.
766  */
767 static int
768 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
769 {
770  int error;
771 
772  error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
773  if (error != 0)
774  printk("aic7xxx_dev_reset returns 0x%x\n", error);
775  return (error);
776 }
777 
778 /*
779  * Reset the SCSI bus.
780  */
781 static int
782 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
783 {
784  struct ahc_softc *ahc;
785  int found;
786  unsigned long flags;
787 
788  ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
789 
790  ahc_lock(ahc, &flags);
791  found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
792  /*initiate reset*/TRUE);
793  ahc_unlock(ahc, &flags);
794 
795  if (bootverbose)
796  printk("%s: SCSI bus reset delivered. "
797  "%d SCBs aborted.\n", ahc_name(ahc), found);
798 
799  return SUCCESS;
800 }
801 
802 struct scsi_host_template aic7xxx_driver_template = {
803  .module = THIS_MODULE,
804  .name = "aic7xxx",
805  .proc_name = "aic7xxx",
806  .proc_info = ahc_linux_proc_info,
807  .info = ahc_linux_info,
808  .queuecommand = ahc_linux_queue,
809  .eh_abort_handler = ahc_linux_abort,
810  .eh_device_reset_handler = ahc_linux_dev_reset,
811  .eh_bus_reset_handler = ahc_linux_bus_reset,
812 #if defined(__i386__)
813  .bios_param = ahc_linux_biosparam,
814 #endif
815  .can_queue = AHC_MAX_QUEUE,
816  .this_id = -1,
817  .max_sectors = 8192,
818  .cmd_per_lun = 2,
819  .use_clustering = ENABLE_CLUSTERING,
820  .slave_alloc = ahc_linux_slave_alloc,
821  .slave_configure = ahc_linux_slave_configure,
822  .target_alloc = ahc_linux_target_alloc,
823  .target_destroy = ahc_linux_target_destroy,
824 };
825 
826 /**************************** Tasklet Handler *********************************/
827 
828 /******************************** Macros **************************************/
829 #define BUILD_SCSIID(ahc, cmd) \
830  ((((cmd)->device->id << TID_SHIFT) & TID) \
831  | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
832  | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
833 
834 /******************************** Bus DMA *************************************/
835 int
836 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
837  bus_size_t alignment, bus_size_t boundary,
838  dma_addr_t lowaddr, dma_addr_t highaddr,
839  bus_dma_filter_t *filter, void *filterarg,
840  bus_size_t maxsize, int nsegments,
841  bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
842 {
843  bus_dma_tag_t dmat;
844 
845  dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
846  if (dmat == NULL)
847  return (ENOMEM);
848 
849  /*
850  * Linux is very simplistic about DMA memory. For now don't
851  * maintain all specification information. Once Linux supplies
852  * better facilities for doing these operations, or the
853  * needs of this particular driver change, we might need to do
854  * more here.
855  */
856  dmat->alignment = alignment;
857  dmat->boundary = boundary;
858  dmat->maxsize = maxsize;
859  *ret_tag = dmat;
860  return (0);
861 }
862 
863 void
864 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
865 {
866  kfree(dmat);
867 }
868 
869 int
870 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
871  int flags, bus_dmamap_t *mapp)
872 {
873  *vaddr = pci_alloc_consistent(ahc->dev_softc,
874  dmat->maxsize, mapp);
875  if (*vaddr == NULL)
876  return ENOMEM;
877  return 0;
878 }
879 
880 void
881 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
882  void* vaddr, bus_dmamap_t map)
883 {
884  pci_free_consistent(ahc->dev_softc, dmat->maxsize,
885  vaddr, map);
886 }
887 
888 int
889 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
890  void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
891  void *cb_arg, int flags)
892 {
893  /*
894  * Assume for now that this will only be used during
895  * initialization and not for per-transaction buffer mapping.
896  */
897  bus_dma_segment_t stack_sg;
898 
899  stack_sg.ds_addr = map;
900  stack_sg.ds_len = dmat->maxsize;
901  cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
902  return (0);
903 }
904 
905 void
906 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
907 {
908 }
909 
910 int
911 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
912 {
913  /* Nothing to do */
914  return (0);
915 }
916 
917 static void
918 ahc_linux_setup_tag_info_global(char *p)
919 {
920  int tags, i, j;
921 
922  tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
923  printk("Setting Global Tags= %d\n", tags);
924 
925  for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
926  for (j = 0; j < AHC_NUM_TARGETS; j++) {
927  aic7xxx_tag_info[i].tag_commands[j] = tags;
928  }
929  }
930 }
931 
932 static void
933 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
934 {
935 
936  if ((instance >= 0) && (targ >= 0)
937  && (instance < ARRAY_SIZE(aic7xxx_tag_info))
938  && (targ < AHC_NUM_TARGETS)) {
939  aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
940  if (bootverbose)
941  printk("tag_info[%d:%d] = %d\n", instance, targ, value);
942  }
943 }
944 
945 static char *
946 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
947  void (*callback)(u_long, int, int, int32_t),
948  u_long callback_arg)
949 {
950  char *tok_end;
951  char *tok_end2;
952  int i;
953  int instance;
954  int targ;
955  int done;
956  char tok_list[] = {'.', ',', '{', '}', '\0'};
957 
958  /* All options use a ':' name/arg separator */
959  if (*opt_arg != ':')
960  return (opt_arg);
961  opt_arg++;
962  instance = -1;
963  targ = -1;
964  done = FALSE;
965  /*
966  * Restore separator that may be in
967  * the middle of our option argument.
968  */
969  tok_end = strchr(opt_arg, '\0');
970  if (tok_end < end)
971  *tok_end = ',';
972  while (!done) {
973  switch (*opt_arg) {
974  case '{':
975  if (instance == -1) {
976  instance = 0;
977  } else {
978  if (depth > 1) {
979  if (targ == -1)
980  targ = 0;
981  } else {
982  printk("Malformed Option %s\n",
983  opt_name);
984  done = TRUE;
985  }
986  }
987  opt_arg++;
988  break;
989  case '}':
990  if (targ != -1)
991  targ = -1;
992  else if (instance != -1)
993  instance = -1;
994  opt_arg++;
995  break;
996  case ',':
997  case '.':
998  if (instance == -1)
999  done = TRUE;
1000  else if (targ >= 0)
1001  targ++;
1002  else if (instance >= 0)
1003  instance++;
1004  opt_arg++;
1005  break;
1006  case '\0':
1007  done = TRUE;
1008  break;
1009  default:
1010  tok_end = end;
1011  for (i = 0; tok_list[i]; i++) {
1012  tok_end2 = strchr(opt_arg, tok_list[i]);
1013  if ((tok_end2) && (tok_end2 < tok_end))
1014  tok_end = tok_end2;
1015  }
1016  callback(callback_arg, instance, targ,
1017  simple_strtol(opt_arg, NULL, 0));
1018  opt_arg = tok_end;
1019  break;
1020  }
1021  }
1022  return (opt_arg);
1023 }
1024 
1025 /*
1026  * Handle Linux boot parameters. This routine allows for assigning a value
1027  * to a parameter with a ':' between the parameter and the value.
1028  * ie. aic7xxx=stpwlev:1,extended
1029  */
1030 static int
1031 aic7xxx_setup(char *s)
1032 {
1033  int i, n;
1034  char *p;
1035  char *end;
1036 
1037  static const struct {
1038  const char *name;
1039  uint32_t *flag;
1040  } options[] = {
1041  { "extended", &aic7xxx_extended },
1042  { "no_reset", &aic7xxx_no_reset },
1043  { "verbose", &aic7xxx_verbose },
1044  { "allow_memio", &aic7xxx_allow_memio},
1045 #ifdef AHC_DEBUG
1046  { "debug", &ahc_debug },
1047 #endif
1048  { "periodic_otag", &aic7xxx_periodic_otag },
1049  { "pci_parity", &aic7xxx_pci_parity },
1050  { "seltime", &aic7xxx_seltime },
1051  { "tag_info", NULL },
1052  { "global_tag_depth", NULL },
1053  { "dv", NULL }
1054  };
1055 
1056  end = strchr(s, '\0');
1057 
1058  /*
1059  * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1060  * will never be 0 in this case.
1061  */
1062  n = 0;
1063 
1064  while ((p = strsep(&s, ",.")) != NULL) {
1065  if (*p == '\0')
1066  continue;
1067  for (i = 0; i < ARRAY_SIZE(options); i++) {
1068 
1069  n = strlen(options[i].name);
1070  if (strncmp(options[i].name, p, n) == 0)
1071  break;
1072  }
1073  if (i == ARRAY_SIZE(options))
1074  continue;
1075 
1076  if (strncmp(p, "global_tag_depth", n) == 0) {
1077  ahc_linux_setup_tag_info_global(p + n);
1078  } else if (strncmp(p, "tag_info", n) == 0) {
1079  s = ahc_parse_brace_option("tag_info", p + n, end,
1080  2, ahc_linux_setup_tag_info, 0);
1081  } else if (p[n] == ':') {
1082  *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1083  } else if (strncmp(p, "verbose", n) == 0) {
1084  *(options[i].flag) = 1;
1085  } else {
1086  *(options[i].flag) ^= 0xFFFFFFFF;
1087  }
1088  }
1089  return 1;
1090 }
1091 
1092 __setup("aic7xxx=", aic7xxx_setup);
1093 
1094 uint32_t aic7xxx_verbose;
1095 
1096 int
1097 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1098 {
1099  char buf[80];
1100  struct Scsi_Host *host;
1101  char *new_name;
1102  u_long s;
1103  int retval;
1104 
1105  template->name = ahc->description;
1106  host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1107  if (host == NULL)
1108  return (ENOMEM);
1109 
1110  *((struct ahc_softc **)host->hostdata) = ahc;
1111  ahc->platform_data->host = host;
1112  host->can_queue = AHC_MAX_QUEUE;
1113  host->cmd_per_lun = 2;
1114  /* XXX No way to communicate the ID for multiple channels */
1115  host->this_id = ahc->our_id;
1116  host->irq = ahc->platform_data->irq;
1117  host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1118  host->max_lun = AHC_NUM_LUNS;
1119  host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1120  host->sg_tablesize = AHC_NSEG;
1121  ahc_lock(ahc, &s);
1122  ahc_set_unit(ahc, ahc_linux_unit++);
1123  ahc_unlock(ahc, &s);
1124  sprintf(buf, "scsi%d", host->host_no);
1125  new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1126  if (new_name != NULL) {
1127  strcpy(new_name, buf);
1128  ahc_set_name(ahc, new_name);
1129  }
1130  host->unique_id = ahc->unit;
1131  ahc_linux_initialize_scsi_bus(ahc);
1132  ahc_intr_enable(ahc, TRUE);
1133 
1134  host->transportt = ahc_linux_transport_template;
1135 
1136  retval = scsi_add_host(host,
1137  (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
1138  if (retval) {
1139  printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1140  scsi_host_put(host);
1141  return retval;
1142  }
1143 
1144  scsi_scan_host(host);
1145  return 0;
1146 }
1147 
1148 /*
1149  * Place the SCSI bus into a known state by either resetting it,
1150  * or forcing transfer negotiations on the next command to any
1151  * target.
1152  */
1153 void
1154 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1155 {
1156  int i;
1157  int numtarg;
1158  unsigned long s;
1159 
1160  i = 0;
1161  numtarg = 0;
1162 
1163  ahc_lock(ahc, &s);
1164 
1165  if (aic7xxx_no_reset != 0)
1166  ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1167 
1168  if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1169  ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1170  else
1171  numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1172 
1173  if ((ahc->features & AHC_TWIN) != 0) {
1174 
1175  if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1176  ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1177  } else {
1178  if (numtarg == 0)
1179  i = 8;
1180  numtarg += 8;
1181  }
1182  }
1183 
1184  /*
1185  * Force negotiation to async for all targets that
1186  * will not see an initial bus reset.
1187  */
1188  for (; i < numtarg; i++) {
1189  struct ahc_devinfo devinfo;
1190  struct ahc_initiator_tinfo *tinfo;
1191  struct ahc_tmode_tstate *tstate;
1192  u_int our_id;
1193  u_int target_id;
1194  char channel;
1195 
1196  channel = 'A';
1197  our_id = ahc->our_id;
1198  target_id = i;
1199  if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1200  channel = 'B';
1201  our_id = ahc->our_id_b;
1202  target_id = i % 8;
1203  }
1204  tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1205  target_id, &tstate);
1206  ahc_compile_devinfo(&devinfo, our_id, target_id,
1207  CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1208  ahc_update_neg_request(ahc, &devinfo, tstate,
1209  tinfo, AHC_NEG_ALWAYS);
1210  }
1211  ahc_unlock(ahc, &s);
1212  /* Give the bus some time to recover */
1213  if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1214  ahc_linux_freeze_simq(ahc);
1215  msleep(AIC7XXX_RESET_DELAY);
1216  ahc_linux_release_simq(ahc);
1217  }
1218 }
1219 
1220 int
1221 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1222 {
1223 
1224  ahc->platform_data =
1225  kmalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
1226  if (ahc->platform_data == NULL)
1227  return (ENOMEM);
1228  memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1229  ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1230  ahc_lockinit(ahc);
1231  ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1232  ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1233  if (aic7xxx_pci_parity == 0)
1234  ahc->flags |= AHC_DISABLE_PCI_PERR;
1235 
1236  return (0);
1237 }
1238 
1239 void
1240 ahc_platform_free(struct ahc_softc *ahc)
1241 {
1242  struct scsi_target *starget;
1243  int i;
1244 
1245  if (ahc->platform_data != NULL) {
1246  /* destroy all of the device and target objects */
1247  for (i = 0; i < AHC_NUM_TARGETS; i++) {
1248  starget = ahc->platform_data->starget[i];
1249  if (starget != NULL) {
1250  ahc->platform_data->starget[i] = NULL;
1251  }
1252  }
1253 
1254  if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1255  free_irq(ahc->platform_data->irq, ahc);
1256  if (ahc->tag == BUS_SPACE_PIO
1257  && ahc->bsh.ioport != 0)
1258  release_region(ahc->bsh.ioport, 256);
1259  if (ahc->tag == BUS_SPACE_MEMIO
1260  && ahc->bsh.maddr != NULL) {
1261  iounmap(ahc->bsh.maddr);
1262  release_mem_region(ahc->platform_data->mem_busaddr,
1263  0x1000);
1264  }
1265 
1266  if (ahc->platform_data->host)
1267  scsi_host_put(ahc->platform_data->host);
1268 
1269  kfree(ahc->platform_data);
1270  }
1271 }
1272 
1273 void
1274 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1275 {
1276  ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1277  SCB_GET_CHANNEL(ahc, scb),
1278  SCB_GET_LUN(scb), SCB_LIST_NULL,
1279  ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1280 }
1281 
1282 void
1283 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1284  struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1285 {
1286  struct ahc_linux_device *dev;
1287  int was_queuing;
1288  int now_queuing;
1289 
1290  if (sdev == NULL)
1291  return;
1292  dev = scsi_transport_device_data(sdev);
1293 
1294  was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1295  switch (alg) {
1296  default:
1297  case AHC_QUEUE_NONE:
1298  now_queuing = 0;
1299  break;
1300  case AHC_QUEUE_BASIC:
1301  now_queuing = AHC_DEV_Q_BASIC;
1302  break;
1303  case AHC_QUEUE_TAGGED:
1304  now_queuing = AHC_DEV_Q_TAGGED;
1305  break;
1306  }
1307  if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1308  && (was_queuing != now_queuing)
1309  && (dev->active != 0)) {
1310  dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1311  dev->qfrozen++;
1312  }
1313 
1314  dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1315  if (now_queuing) {
1316  u_int usertags;
1317 
1318  usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1319  if (!was_queuing) {
1320  /*
1321  * Start out aggressively and allow our
1322  * dynamic queue depth algorithm to take
1323  * care of the rest.
1324  */
1325  dev->maxtags = usertags;
1326  dev->openings = dev->maxtags - dev->active;
1327  }
1328  if (dev->maxtags == 0) {
1329  /*
1330  * Queueing is disabled by the user.
1331  */
1332  dev->openings = 1;
1333  } else if (alg == AHC_QUEUE_TAGGED) {
1334  dev->flags |= AHC_DEV_Q_TAGGED;
1335  if (aic7xxx_periodic_otag != 0)
1336  dev->flags |= AHC_DEV_PERIODIC_OTAG;
1337  } else
1338  dev->flags |= AHC_DEV_Q_BASIC;
1339  } else {
1340  /* We can only have one opening. */
1341  dev->maxtags = 0;
1342  dev->openings = 1 - dev->active;
1343  }
1344  switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1345  case AHC_DEV_Q_BASIC:
1346  scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1347  scsi_activate_tcq(sdev, dev->openings + dev->active);
1348  break;
1349  case AHC_DEV_Q_TAGGED:
1350  scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1351  scsi_activate_tcq(sdev, dev->openings + dev->active);
1352  break;
1353  default:
1354  /*
1355  * We allow the OS to queue 2 untagged transactions to
1356  * us at any time even though we can only execute them
1357  * serially on the controller/device. This should
1358  * remove some latency.
1359  */
1360  scsi_deactivate_tcq(sdev, 2);
1361  break;
1362  }
1363 }
1364 
1365 int
1366 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1367  int lun, u_int tag, role_t role, uint32_t status)
1368 {
1369  return 0;
1370 }
1371 
1372 static u_int
1373 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1374 {
1375  static int warned_user;
1376  u_int tags;
1377 
1378  tags = 0;
1379  if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1380  if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1381  if (warned_user == 0) {
1382 
1383  printk(KERN_WARNING
1384 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1385 "aic7xxx: for installed controllers. Using defaults\n"
1386 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1387 "aic7xxx: the aic7xxx_osm..c source file.\n");
1388  warned_user++;
1389  }
1390  tags = AHC_MAX_QUEUE;
1391  } else {
1392  adapter_tag_info_t *tag_info;
1393 
1394  tag_info = &aic7xxx_tag_info[ahc->unit];
1395  tags = tag_info->tag_commands[devinfo->target_offset];
1396  if (tags > AHC_MAX_QUEUE)
1397  tags = AHC_MAX_QUEUE;
1398  }
1399  }
1400  return (tags);
1401 }
1402 
1403 /*
1404  * Determines the queue depth for a given device.
1405  */
1406 static void
1407 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1408 {
1409  struct ahc_devinfo devinfo;
1410  u_int tags;
1411  struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1412 
1413  ahc_compile_devinfo(&devinfo,
1414  sdev->sdev_target->channel == 0
1415  ? ahc->our_id : ahc->our_id_b,
1416  sdev->sdev_target->id, sdev->lun,
1417  sdev->sdev_target->channel == 0 ? 'A' : 'B',
1418  ROLE_INITIATOR);
1419  tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1420  if (tags != 0 && sdev->tagged_supported != 0) {
1421 
1422  ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1423  ahc_send_async(ahc, devinfo.channel, devinfo.target,
1424  devinfo.lun, AC_TRANSFER_NEG);
1425  ahc_print_devinfo(ahc, &devinfo);
1426  printk("Tagged Queuing enabled. Depth %d\n", tags);
1427  } else {
1428  ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1429  ahc_send_async(ahc, devinfo.channel, devinfo.target,
1430  devinfo.lun, AC_TRANSFER_NEG);
1431  }
1432 }
1433 
1434 static int
1435 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1436  struct scsi_cmnd *cmd)
1437 {
1438  struct scb *scb;
1439  struct hardware_scb *hscb;
1440  struct ahc_initiator_tinfo *tinfo;
1441  struct ahc_tmode_tstate *tstate;
1442  uint16_t mask;
1443  struct scb_tailq *untagged_q = NULL;
1444  int nseg;
1445 
1446  /*
1447  * Schedule us to run later. The only reason we are not
1448  * running is because the whole controller Q is frozen.
1449  */
1450  if (ahc->platform_data->qfrozen != 0)
1451  return SCSI_MLQUEUE_HOST_BUSY;
1452 
1453  /*
1454  * We only allow one untagged transaction
1455  * per target in the initiator role unless
1456  * we are storing a full busy target *lun*
1457  * table in SCB space.
1458  */
1459  if (!blk_rq_tagged(cmd->request)
1460  && (ahc->features & AHC_SCB_BTT) == 0) {
1461  int target_offset;
1462 
1463  target_offset = cmd->device->id + cmd->device->channel * 8;
1464  untagged_q = &(ahc->untagged_queues[target_offset]);
1465  if (!TAILQ_EMPTY(untagged_q))
1466  /* if we're already executing an untagged command
1467  * we're busy to another */
1468  return SCSI_MLQUEUE_DEVICE_BUSY;
1469  }
1470 
1471  nseg = scsi_dma_map(cmd);
1472  if (nseg < 0)
1473  return SCSI_MLQUEUE_HOST_BUSY;
1474 
1475  /*
1476  * Get an scb to use.
1477  */
1478  scb = ahc_get_scb(ahc);
1479  if (!scb) {
1480  scsi_dma_unmap(cmd);
1481  return SCSI_MLQUEUE_HOST_BUSY;
1482  }
1483 
1484  scb->io_ctx = cmd;
1485  scb->platform_data->dev = dev;
1486  hscb = scb->hscb;
1487  cmd->host_scribble = (char *)scb;
1488 
1489  /*
1490  * Fill out basics of the HSCB.
1491  */
1492  hscb->control = 0;
1493  hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1494  hscb->lun = cmd->device->lun;
1495  mask = SCB_GET_TARGET_MASK(ahc, scb);
1496  tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1497  SCB_GET_OUR_ID(scb),
1498  SCB_GET_TARGET(ahc, scb), &tstate);
1499  hscb->scsirate = tinfo->scsirate;
1500  hscb->scsioffset = tinfo->curr.offset;
1501  if ((tstate->ultraenb & mask) != 0)
1502  hscb->control |= ULTRAENB;
1503 
1504  if ((ahc->user_discenable & mask) != 0)
1505  hscb->control |= DISCENB;
1506 
1507  if ((tstate->auto_negotiate & mask) != 0) {
1508  scb->flags |= SCB_AUTO_NEGOTIATE;
1509  scb->hscb->control |= MK_MESSAGE;
1510  }
1511 
1512  if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1513  int msg_bytes;
1514  uint8_t tag_msgs[2];
1515 
1516  msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1517  if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1518  hscb->control |= tag_msgs[0];
1519  if (tag_msgs[0] == MSG_ORDERED_TASK)
1520  dev->commands_since_idle_or_otag = 0;
1521  } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1522  && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1523  hscb->control |= MSG_ORDERED_TASK;
1524  dev->commands_since_idle_or_otag = 0;
1525  } else {
1526  hscb->control |= MSG_SIMPLE_TASK;
1527  }
1528  }
1529 
1530  hscb->cdb_len = cmd->cmd_len;
1531  if (hscb->cdb_len <= 12) {
1532  memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1533  } else {
1534  memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1535  scb->flags |= SCB_CDB32_PTR;
1536  }
1537 
1538  scb->platform_data->xfer_len = 0;
1539  ahc_set_residual(scb, 0);
1540  ahc_set_sense_residual(scb, 0);
1541  scb->sg_count = 0;
1542 
1543  if (nseg > 0) {
1544  struct ahc_dma_seg *sg;
1545  struct scatterlist *cur_seg;
1546  int i;
1547 
1548  /* Copy the segments into the SG list. */
1549  sg = scb->sg_list;
1550  /*
1551  * The sg_count may be larger than nseg if
1552  * a transfer crosses a 32bit page.
1553  */
1554  scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1555  dma_addr_t addr;
1556  bus_size_t len;
1557  int consumed;
1558 
1559  addr = sg_dma_address(cur_seg);
1560  len = sg_dma_len(cur_seg);
1561  consumed = ahc_linux_map_seg(ahc, scb,
1562  sg, addr, len);
1563  sg += consumed;
1564  scb->sg_count += consumed;
1565  }
1566  sg--;
1567  sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1568 
1569  /*
1570  * Reset the sg list pointer.
1571  */
1572  scb->hscb->sgptr =
1573  ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1574 
1575  /*
1576  * Copy the first SG into the "current"
1577  * data pointer area.
1578  */
1579  scb->hscb->dataptr = scb->sg_list->addr;
1580  scb->hscb->datacnt = scb->sg_list->len;
1581  } else {
1582  scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1583  scb->hscb->dataptr = 0;
1584  scb->hscb->datacnt = 0;
1585  scb->sg_count = 0;
1586  }
1587 
1588  LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1589  dev->openings--;
1590  dev->active++;
1591  dev->commands_issued++;
1592  if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1593  dev->commands_since_idle_or_otag++;
1594 
1595  scb->flags |= SCB_ACTIVE;
1596  if (untagged_q) {
1597  TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1598  scb->flags |= SCB_UNTAGGEDQ;
1599  }
1600  ahc_queue_scb(ahc, scb);
1601  return 0;
1602 }
1603 
1604 /*
1605  * SCSI controller interrupt handler.
1606  */
1607 irqreturn_t
1608 ahc_linux_isr(int irq, void *dev_id)
1609 {
1610  struct ahc_softc *ahc;
1611  u_long flags;
1612  int ours;
1613 
1614  ahc = (struct ahc_softc *) dev_id;
1615  ahc_lock(ahc, &flags);
1616  ours = ahc_intr(ahc);
1617  ahc_unlock(ahc, &flags);
1618  return IRQ_RETVAL(ours);
1619 }
1620 
1621 void
1622 ahc_platform_flushwork(struct ahc_softc *ahc)
1623 {
1624 
1625 }
1626 
1627 void
1628 ahc_send_async(struct ahc_softc *ahc, char channel,
1629  u_int target, u_int lun, ac_code code)
1630 {
1631  switch (code) {
1632  case AC_TRANSFER_NEG:
1633  {
1634  char buf[80];
1635  struct scsi_target *starget;
1636  struct ahc_linux_target *targ;
1637  struct info_str info;
1638  struct ahc_initiator_tinfo *tinfo;
1639  struct ahc_tmode_tstate *tstate;
1640  int target_offset;
1641  unsigned int target_ppr_options;
1642 
1643  BUG_ON(target == CAM_TARGET_WILDCARD);
1644 
1645  info.buffer = buf;
1646  info.length = sizeof(buf);
1647  info.offset = 0;
1648  info.pos = 0;
1649  tinfo = ahc_fetch_transinfo(ahc, channel,
1650  channel == 'A' ? ahc->our_id
1651  : ahc->our_id_b,
1652  target, &tstate);
1653 
1654  /*
1655  * Don't bother reporting results while
1656  * negotiations are still pending.
1657  */
1658  if (tinfo->curr.period != tinfo->goal.period
1659  || tinfo->curr.width != tinfo->goal.width
1660  || tinfo->curr.offset != tinfo->goal.offset
1661  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1662  if (bootverbose == 0)
1663  break;
1664 
1665  /*
1666  * Don't bother reporting results that
1667  * are identical to those last reported.
1668  */
1669  target_offset = target;
1670  if (channel == 'B')
1671  target_offset += 8;
1672  starget = ahc->platform_data->starget[target_offset];
1673  if (starget == NULL)
1674  break;
1675  targ = scsi_transport_target_data(starget);
1676 
1677  target_ppr_options =
1678  (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1679  + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1680  + (spi_iu(starget) ? MSG_EXT_PPR_IU_REQ : 0);
1681 
1682  if (tinfo->curr.period == spi_period(starget)
1683  && tinfo->curr.width == spi_width(starget)
1684  && tinfo->curr.offset == spi_offset(starget)
1685  && tinfo->curr.ppr_options == target_ppr_options)
1686  if (bootverbose == 0)
1687  break;
1688 
1689  spi_period(starget) = tinfo->curr.period;
1690  spi_width(starget) = tinfo->curr.width;
1691  spi_offset(starget) = tinfo->curr.offset;
1692  spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1693  spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1694  spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1695  spi_display_xfer_agreement(starget);
1696  break;
1697  }
1698  case AC_SENT_BDR:
1699  {
1700  WARN_ON(lun != CAM_LUN_WILDCARD);
1701  scsi_report_device_reset(ahc->platform_data->host,
1702  channel - 'A', target);
1703  break;
1704  }
1705  case AC_BUS_RESET:
1706  if (ahc->platform_data->host != NULL) {
1707  scsi_report_bus_reset(ahc->platform_data->host,
1708  channel - 'A');
1709  }
1710  break;
1711  default:
1712  panic("ahc_send_async: Unexpected async event");
1713  }
1714 }
1715 
1716 /*
1717  * Calls the higher level scsi done function and frees the scb.
1718  */
1719 void
1720 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1721 {
1722  struct scsi_cmnd *cmd;
1723  struct ahc_linux_device *dev;
1724 
1725  LIST_REMOVE(scb, pending_links);
1726  if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1727  struct scb_tailq *untagged_q;
1728  int target_offset;
1729 
1730  target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1731  untagged_q = &(ahc->untagged_queues[target_offset]);
1732  TAILQ_REMOVE(untagged_q, scb, links.tqe);
1733  BUG_ON(!TAILQ_EMPTY(untagged_q));
1734  } else if ((scb->flags & SCB_ACTIVE) == 0) {
1735  /*
1736  * Transactions aborted from the untagged queue may
1737  * not have been dispatched to the controller, so
1738  * only check the SCB_ACTIVE flag for tagged transactions.
1739  */
1740  printk("SCB %d done'd twice\n", scb->hscb->tag);
1741  ahc_dump_card_state(ahc);
1742  panic("Stopping for safety");
1743  }
1744  cmd = scb->io_ctx;
1745  dev = scb->platform_data->dev;
1746  dev->active--;
1747  dev->openings++;
1748  if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1749  cmd->result &= ~(CAM_DEV_QFRZN << 16);
1750  dev->qfrozen--;
1751  }
1752  ahc_linux_unmap_scb(ahc, scb);
1753 
1754  /*
1755  * Guard against stale sense data.
1756  * The Linux mid-layer assumes that sense
1757  * was retrieved anytime the first byte of
1758  * the sense buffer looks "sane".
1759  */
1760  cmd->sense_buffer[0] = 0;
1761  if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1762  uint32_t amount_xferred;
1763 
1764  amount_xferred =
1765  ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1766  if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1767 #ifdef AHC_DEBUG
1768  if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1769  ahc_print_path(ahc, scb);
1770  printk("Set CAM_UNCOR_PARITY\n");
1771  }
1772 #endif
1773  ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1774 #ifdef AHC_REPORT_UNDERFLOWS
1775  /*
1776  * This code is disabled by default as some
1777  * clients of the SCSI system do not properly
1778  * initialize the underflow parameter. This
1779  * results in spurious termination of commands
1780  * that complete as expected (e.g. underflow is
1781  * allowed as command can return variable amounts
1782  * of data.
1783  */
1784  } else if (amount_xferred < scb->io_ctx->underflow) {
1785  u_int i;
1786 
1787  ahc_print_path(ahc, scb);
1788  printk("CDB:");
1789  for (i = 0; i < scb->io_ctx->cmd_len; i++)
1790  printk(" 0x%x", scb->io_ctx->cmnd[i]);
1791  printk("\n");
1792  ahc_print_path(ahc, scb);
1793  printk("Saw underflow (%ld of %ld bytes). "
1794  "Treated as error\n",
1795  ahc_get_residual(scb),
1796  ahc_get_transfer_length(scb));
1797  ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1798 #endif
1799  } else {
1800  ahc_set_transaction_status(scb, CAM_REQ_CMP);
1801  }
1802  } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1803  ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1804  }
1805 
1806  if (dev->openings == 1
1807  && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1808  && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1809  dev->tag_success_count++;
1810  /*
1811  * Some devices deal with temporary internal resource
1812  * shortages by returning queue full. When the queue
1813  * full occurrs, we throttle back. Slowly try to get
1814  * back to our previous queue depth.
1815  */
1816  if ((dev->openings + dev->active) < dev->maxtags
1817  && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1818  dev->tag_success_count = 0;
1819  dev->openings++;
1820  }
1821 
1822  if (dev->active == 0)
1823  dev->commands_since_idle_or_otag = 0;
1824 
1825  if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1826  printk("Recovery SCB completes\n");
1827  if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1828  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1829  ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1830 
1831  if (ahc->platform_data->eh_done)
1832  complete(ahc->platform_data->eh_done);
1833  }
1834 
1835  ahc_free_scb(ahc, scb);
1836  ahc_linux_queue_cmd_complete(ahc, cmd);
1837 }
1838 
1839 static void
1840 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1841  struct scsi_device *sdev, struct scb *scb)
1842 {
1843  struct ahc_devinfo devinfo;
1844  struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1845 
1846  ahc_compile_devinfo(&devinfo,
1847  ahc->our_id,
1848  sdev->sdev_target->id, sdev->lun,
1849  sdev->sdev_target->channel == 0 ? 'A' : 'B',
1850  ROLE_INITIATOR);
1851 
1852  /*
1853  * We don't currently trust the mid-layer to
1854  * properly deal with queue full or busy. So,
1855  * when one occurs, we tell the mid-layer to
1856  * unconditionally requeue the command to us
1857  * so that we can retry it ourselves. We also
1858  * implement our own throttling mechanism so
1859  * we don't clobber the device with too many
1860  * commands.
1861  */
1862  switch (ahc_get_scsi_status(scb)) {
1863  default:
1864  break;
1865  case SCSI_STATUS_CHECK_COND:
1866  case SCSI_STATUS_CMD_TERMINATED:
1867  {
1868  struct scsi_cmnd *cmd;
1869 
1870  /*
1871  * Copy sense information to the OS's cmd
1872  * structure if it is available.
1873  */
1874  cmd = scb->io_ctx;
1875  if (scb->flags & SCB_SENSE) {
1876  u_int sense_size;
1877 
1878  sense_size = min(sizeof(struct scsi_sense_data)
1879  - ahc_get_sense_residual(scb),
1880  (u_long)SCSI_SENSE_BUFFERSIZE);
1881  memcpy(cmd->sense_buffer,
1882  ahc_get_sense_buf(ahc, scb), sense_size);
1883  if (sense_size < SCSI_SENSE_BUFFERSIZE)
1884  memset(&cmd->sense_buffer[sense_size], 0,
1885  SCSI_SENSE_BUFFERSIZE - sense_size);
1886  cmd->result |= (DRIVER_SENSE << 24);
1887 #ifdef AHC_DEBUG
1888  if (ahc_debug & AHC_SHOW_SENSE) {
1889  int i;
1890 
1891  printk("Copied %d bytes of sense data:",
1892  sense_size);
1893  for (i = 0; i < sense_size; i++) {
1894  if ((i & 0xF) == 0)
1895  printk("\n");
1896  printk("0x%x ", cmd->sense_buffer[i]);
1897  }
1898  printk("\n");
1899  }
1900 #endif
1901  }
1902  break;
1903  }
1904  case SCSI_STATUS_QUEUE_FULL:
1905  {
1906  /*
1907  * By the time the core driver has returned this
1908  * command, all other commands that were queued
1909  * to us but not the device have been returned.
1910  * This ensures that dev->active is equal to
1911  * the number of commands actually queued to
1912  * the device.
1913  */
1914  dev->tag_success_count = 0;
1915  if (dev->active != 0) {
1916  /*
1917  * Drop our opening count to the number
1918  * of commands currently outstanding.
1919  */
1920  dev->openings = 0;
1921 /*
1922  ahc_print_path(ahc, scb);
1923  printk("Dropping tag count to %d\n", dev->active);
1924  */
1925  if (dev->active == dev->tags_on_last_queuefull) {
1926 
1927  dev->last_queuefull_same_count++;
1928  /*
1929  * If we repeatedly see a queue full
1930  * at the same queue depth, this
1931  * device has a fixed number of tag
1932  * slots. Lock in this tag depth
1933  * so we stop seeing queue fulls from
1934  * this device.
1935  */
1936  if (dev->last_queuefull_same_count
1937  == AHC_LOCK_TAGS_COUNT) {
1938  dev->maxtags = dev->active;
1939  ahc_print_path(ahc, scb);
1940  printk("Locking max tag count at %d\n",
1941  dev->active);
1942  }
1943  } else {
1944  dev->tags_on_last_queuefull = dev->active;
1945  dev->last_queuefull_same_count = 0;
1946  }
1947  ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1948  ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1949  ahc_platform_set_tags(ahc, sdev, &devinfo,
1950  (dev->flags & AHC_DEV_Q_BASIC)
1951  ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1952  break;
1953  }
1954  /*
1955  * Drop down to a single opening, and treat this
1956  * as if the target returned BUSY SCSI status.
1957  */
1958  dev->openings = 1;
1959  ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1960  ahc_platform_set_tags(ahc, sdev, &devinfo,
1961  (dev->flags & AHC_DEV_Q_BASIC)
1962  ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1963  break;
1964  }
1965  }
1966 }
1967 
1968 static void
1969 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1970 {
1971  /*
1972  * Map CAM error codes into Linux Error codes. We
1973  * avoid the conversion so that the DV code has the
1974  * full error information available when making
1975  * state change decisions.
1976  */
1977  {
1978  u_int new_status;
1979 
1980  switch (ahc_cmd_get_transaction_status(cmd)) {
1981  case CAM_REQ_INPROG:
1982  case CAM_REQ_CMP:
1983  case CAM_SCSI_STATUS_ERROR:
1984  new_status = DID_OK;
1985  break;
1986  case CAM_REQ_ABORTED:
1987  new_status = DID_ABORT;
1988  break;
1989  case CAM_BUSY:
1990  new_status = DID_BUS_BUSY;
1991  break;
1992  case CAM_REQ_INVALID:
1993  case CAM_PATH_INVALID:
1994  new_status = DID_BAD_TARGET;
1995  break;
1996  case CAM_SEL_TIMEOUT:
1997  new_status = DID_NO_CONNECT;
1998  break;
1999  case CAM_SCSI_BUS_RESET:
2000  case CAM_BDR_SENT:
2001  new_status = DID_RESET;
2002  break;
2003  case CAM_UNCOR_PARITY:
2004  new_status = DID_PARITY;
2005  break;
2006  case CAM_CMD_TIMEOUT:
2007  new_status = DID_TIME_OUT;
2008  break;
2009  case CAM_UA_ABORT:
2010  case CAM_REQ_CMP_ERR:
2011  case CAM_AUTOSENSE_FAIL:
2012  case CAM_NO_HBA:
2013  case CAM_DATA_RUN_ERR:
2014  case CAM_UNEXP_BUSFREE:
2015  case CAM_SEQUENCE_FAIL:
2016  case CAM_CCB_LEN_ERR:
2017  case CAM_PROVIDE_FAIL:
2018  case CAM_REQ_TERMIO:
2019  case CAM_UNREC_HBA_ERROR:
2020  case CAM_REQ_TOO_BIG:
2021  new_status = DID_ERROR;
2022  break;
2023  case CAM_REQUEUE_REQ:
2024  new_status = DID_REQUEUE;
2025  break;
2026  default:
2027  /* We should never get here */
2028  new_status = DID_ERROR;
2029  break;
2030  }
2031 
2032  ahc_cmd_set_transaction_status(cmd, new_status);
2033  }
2034 
2035  cmd->scsi_done(cmd);
2036 }
2037 
2038 static void
2039 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2040 {
2041  unsigned long s;
2042 
2043  ahc_lock(ahc, &s);
2044  ahc->platform_data->qfrozen++;
2045  if (ahc->platform_data->qfrozen == 1) {
2046  scsi_block_requests(ahc->platform_data->host);
2047 
2048  /* XXX What about Twin channels? */
2049  ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2050  CAM_LUN_WILDCARD, SCB_LIST_NULL,
2051  ROLE_INITIATOR, CAM_REQUEUE_REQ);
2052  }
2053  ahc_unlock(ahc, &s);
2054 }
2055 
2056 static void
2057 ahc_linux_release_simq(struct ahc_softc *ahc)
2058 {
2059  u_long s;
2060  int unblock_reqs;
2061 
2062  unblock_reqs = 0;
2063  ahc_lock(ahc, &s);
2064  if (ahc->platform_data->qfrozen > 0)
2065  ahc->platform_data->qfrozen--;
2066  if (ahc->platform_data->qfrozen == 0)
2067  unblock_reqs = 1;
2068  ahc_unlock(ahc, &s);
2069  /*
2070  * There is still a race here. The mid-layer
2071  * should keep its own freeze count and use
2072  * a bottom half handler to run the queues
2073  * so we can unblock with our own lock held.
2074  */
2075  if (unblock_reqs)
2076  scsi_unblock_requests(ahc->platform_data->host);
2077 }
2078 
2079 static int
2080 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2081 {
2082  struct ahc_softc *ahc;
2083  struct ahc_linux_device *dev;
2084  struct scb *pending_scb;
2085  u_int saved_scbptr;
2086  u_int active_scb_index;
2087  u_int last_phase;
2088  u_int saved_scsiid;
2089  u_int cdb_byte;
2090  int retval;
2091  int was_paused;
2092  int paused;
2093  int wait;
2094  int disconnected;
2095  unsigned long flags;
2096 
2097  pending_scb = NULL;
2098  paused = FALSE;
2099  wait = FALSE;
2100  ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2101 
2102  scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2103  flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2104 
2105  printk("CDB:");
2106  for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2107  printk(" 0x%x", cmd->cmnd[cdb_byte]);
2108  printk("\n");
2109 
2110  ahc_lock(ahc, &flags);
2111 
2112  /*
2113  * First determine if we currently own this command.
2114  * Start by searching the device queue. If not found
2115  * there, check the pending_scb list. If not found
2116  * at all, and the system wanted us to just abort the
2117  * command, return success.
2118  */
2119  dev = scsi_transport_device_data(cmd->device);
2120 
2121  if (dev == NULL) {
2122  /*
2123  * No target device for this command exists,
2124  * so we must not still own the command.
2125  */
2126  printk("%s:%d:%d:%d: Is not an active device\n",
2127  ahc_name(ahc), cmd->device->channel, cmd->device->id,
2128  cmd->device->lun);
2129  retval = SUCCESS;
2130  goto no_cmd;
2131  }
2132 
2133  if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2134  && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2135  cmd->device->channel + 'A',
2136  cmd->device->lun,
2137  CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2138  printk("%s:%d:%d:%d: Command found on untagged queue\n",
2139  ahc_name(ahc), cmd->device->channel, cmd->device->id,
2140  cmd->device->lun);
2141  retval = SUCCESS;
2142  goto done;
2143  }
2144 
2145  /*
2146  * See if we can find a matching cmd in the pending list.
2147  */
2148  LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2149  if (pending_scb->io_ctx == cmd)
2150  break;
2151  }
2152 
2153  if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2154 
2155  /* Any SCB for this device will do for a target reset */
2156  LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2157  if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2158  scmd_channel(cmd) + 'A',
2159  CAM_LUN_WILDCARD,
2160  SCB_LIST_NULL, ROLE_INITIATOR))
2161  break;
2162  }
2163  }
2164 
2165  if (pending_scb == NULL) {
2166  scmd_printk(KERN_INFO, cmd, "Command not found\n");
2167  goto no_cmd;
2168  }
2169 
2170  if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2171  /*
2172  * We can't queue two recovery actions using the same SCB
2173  */
2174  retval = FAILED;
2175  goto done;
2176  }
2177 
2178  /*
2179  * Ensure that the card doesn't do anything
2180  * behind our back and that we didn't "just" miss
2181  * an interrupt that would affect this cmd.
2182  */
2183  was_paused = ahc_is_paused(ahc);
2184  ahc_pause_and_flushwork(ahc);
2185  paused = TRUE;
2186 
2187  if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2188  scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2189  goto no_cmd;
2190  }
2191 
2192  printk("%s: At time of recovery, card was %spaused\n",
2193  ahc_name(ahc), was_paused ? "" : "not ");
2194  ahc_dump_card_state(ahc);
2195 
2196  disconnected = TRUE;
2197  if (flag == SCB_ABORT) {
2198  if (ahc_search_qinfifo(ahc, cmd->device->id,
2199  cmd->device->channel + 'A',
2200  cmd->device->lun,
2201  pending_scb->hscb->tag,
2202  ROLE_INITIATOR, CAM_REQ_ABORTED,
2203  SEARCH_COMPLETE) > 0) {
2204  printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2205  ahc_name(ahc), cmd->device->channel,
2206  cmd->device->id, cmd->device->lun);
2207  retval = SUCCESS;
2208  goto done;
2209  }
2210  } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2211  cmd->device->channel + 'A',
2212  cmd->device->lun, pending_scb->hscb->tag,
2213  ROLE_INITIATOR, /*status*/0,
2214  SEARCH_COUNT) > 0) {
2215  disconnected = FALSE;
2216  }
2217 
2218  if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2219  struct scb *bus_scb;
2220 
2221  bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2222  if (bus_scb == pending_scb)
2223  disconnected = FALSE;
2224  else if (flag != SCB_ABORT
2225  && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2226  && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2227  disconnected = FALSE;
2228  }
2229 
2230  /*
2231  * At this point, pending_scb is the scb associated with the
2232  * passed in command. That command is currently active on the
2233  * bus, is in the disconnected state, or we're hoping to find
2234  * a command for the same target active on the bus to abuse to
2235  * send a BDR. Queue the appropriate message based on which of
2236  * these states we are in.
2237  */
2238  last_phase = ahc_inb(ahc, LASTPHASE);
2239  saved_scbptr = ahc_inb(ahc, SCBPTR);
2240  active_scb_index = ahc_inb(ahc, SCB_TAG);
2241  saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2242  if (last_phase != P_BUSFREE
2243  && (pending_scb->hscb->tag == active_scb_index
2244  || (flag == SCB_DEVICE_RESET
2245  && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2246 
2247  /*
2248  * We're active on the bus, so assert ATN
2249  * and hope that the target responds.
2250  */
2251  pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2252  pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2253  ahc_outb(ahc, MSG_OUT, HOST_MSG);
2254  ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2255  scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2256  wait = TRUE;
2257  } else if (disconnected) {
2258 
2259  /*
2260  * Actually re-queue this SCB in an attempt
2261  * to select the device before it reconnects.
2262  * In either case (selection or reselection),
2263  * we will now issue the approprate message
2264  * to the timed-out device.
2265  *
2266  * Set the MK_MESSAGE control bit indicating
2267  * that we desire to send a message. We
2268  * also set the disconnected flag since
2269  * in the paging case there is no guarantee
2270  * that our SCB control byte matches the
2271  * version on the card. We don't want the
2272  * sequencer to abort the command thinking
2273  * an unsolicited reselection occurred.
2274  */
2275  pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2276  pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2277 
2278  /*
2279  * Remove any cached copy of this SCB in the
2280  * disconnected list in preparation for the
2281  * queuing of our abort SCB. We use the
2282  * same element in the SCB, SCB_NEXT, for
2283  * both the qinfifo and the disconnected list.
2284  */
2285  ahc_search_disc_list(ahc, cmd->device->id,
2286  cmd->device->channel + 'A',
2287  cmd->device->lun, pending_scb->hscb->tag,
2288  /*stop_on_first*/TRUE,
2289  /*remove*/TRUE,
2290  /*save_state*/FALSE);
2291 
2292  /*
2293  * In the non-paging case, the sequencer will
2294  * never re-reference the in-core SCB.
2295  * To make sure we are notified during
2296  * reselection, set the MK_MESSAGE flag in
2297  * the card's copy of the SCB.
2298  */
2299  if ((ahc->flags & AHC_PAGESCBS) == 0) {
2300  ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2301  ahc_outb(ahc, SCB_CONTROL,
2302  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2303  }
2304 
2305  /*
2306  * Clear out any entries in the QINFIFO first
2307  * so we are the next SCB for this target
2308  * to run.
2309  */
2310  ahc_search_qinfifo(ahc, cmd->device->id,
2311  cmd->device->channel + 'A',
2312  cmd->device->lun, SCB_LIST_NULL,
2313  ROLE_INITIATOR, CAM_REQUEUE_REQ,
2314  SEARCH_COMPLETE);
2315  ahc_qinfifo_requeue_tail(ahc, pending_scb);
2316  ahc_outb(ahc, SCBPTR, saved_scbptr);
2317  ahc_print_path(ahc, pending_scb);
2318  printk("Device is disconnected, re-queuing SCB\n");
2319  wait = TRUE;
2320  } else {
2321  scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2322  retval = FAILED;
2323  goto done;
2324  }
2325 
2326 no_cmd:
2327  /*
2328  * Our assumption is that if we don't have the command, no
2329  * recovery action was required, so we return success. Again,
2330  * the semantics of the mid-layer recovery engine are not
2331  * well defined, so this may change in time.
2332  */
2333  retval = SUCCESS;
2334 done:
2335  if (paused)
2336  ahc_unpause(ahc);
2337  if (wait) {
2338  DECLARE_COMPLETION_ONSTACK(done);
2339 
2340  ahc->platform_data->eh_done = &done;
2341  ahc_unlock(ahc, &flags);
2342 
2343  printk("Recovery code sleeping\n");
2344  if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2345  ahc_lock(ahc, &flags);
2346  ahc->platform_data->eh_done = NULL;
2347  ahc_unlock(ahc, &flags);
2348 
2349  printk("Timer Expired\n");
2350  retval = FAILED;
2351  }
2352  printk("Recovery code awake\n");
2353  } else
2354  ahc_unlock(ahc, &flags);
2355  return (retval);
2356 }
2357 
2358 void
2359 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2360 {
2361 }
2362 
2363 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2364 {
2365  struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2366  struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2367  struct ahc_devinfo devinfo;
2368  unsigned long flags;
2369 
2370  ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2371  starget->channel + 'A', ROLE_INITIATOR);
2372  ahc_lock(ahc, &flags);
2373  ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2374  ahc_unlock(ahc, &flags);
2375 }
2376 
2377 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2378 {
2379  struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2380  struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2381  struct ahc_tmode_tstate *tstate;
2382  struct ahc_initiator_tinfo *tinfo
2383  = ahc_fetch_transinfo(ahc,
2384  starget->channel + 'A',
2385  shost->this_id, starget->id, &tstate);
2386  struct ahc_devinfo devinfo;
2387  unsigned int ppr_options = tinfo->goal.ppr_options;
2388  unsigned long flags;
2389  unsigned long offset = tinfo->goal.offset;
2390  const struct ahc_syncrate *syncrate;
2391 
2392  if (offset == 0)
2393  offset = MAX_OFFSET;
2394 
2395  if (period < 9)
2396  period = 9; /* 12.5ns is our minimum */
2397  if (period == 9) {
2398  if (spi_max_width(starget))
2399  ppr_options |= MSG_EXT_PPR_DT_REQ;
2400  else
2401  /* need wide for DT and need DT for 12.5 ns */
2402  period = 10;
2403  }
2404 
2405  ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2406  starget->channel + 'A', ROLE_INITIATOR);
2407 
2408  /* all PPR requests apart from QAS require wide transfers */
2409  if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2410  if (spi_width(starget) == 0)
2411  ppr_options &= MSG_EXT_PPR_QAS_REQ;
2412  }
2413 
2414  syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2415  ahc_lock(ahc, &flags);
2416  ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2417  ppr_options, AHC_TRANS_GOAL, FALSE);
2418  ahc_unlock(ahc, &flags);
2419 }
2420 
2421 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2422 {
2423  struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2424  struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2425  struct ahc_tmode_tstate *tstate;
2426  struct ahc_initiator_tinfo *tinfo
2427  = ahc_fetch_transinfo(ahc,
2428  starget->channel + 'A',
2429  shost->this_id, starget->id, &tstate);
2430  struct ahc_devinfo devinfo;
2431  unsigned int ppr_options = 0;
2432  unsigned int period = 0;
2433  unsigned long flags;
2434  const struct ahc_syncrate *syncrate = NULL;
2435 
2436  ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2437  starget->channel + 'A', ROLE_INITIATOR);
2438  if (offset != 0) {
2439  syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2440  period = tinfo->goal.period;
2441  ppr_options = tinfo->goal.ppr_options;
2442  }
2443  ahc_lock(ahc, &flags);
2444  ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2445  ppr_options, AHC_TRANS_GOAL, FALSE);
2446  ahc_unlock(ahc, &flags);
2447 }
2448 
2449 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2450 {
2451  struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2452  struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2453  struct ahc_tmode_tstate *tstate;
2454  struct ahc_initiator_tinfo *tinfo
2455  = ahc_fetch_transinfo(ahc,
2456  starget->channel + 'A',
2457  shost->this_id, starget->id, &tstate);
2458  struct ahc_devinfo devinfo;
2459  unsigned int ppr_options = tinfo->goal.ppr_options
2460  & ~MSG_EXT_PPR_DT_REQ;
2461  unsigned int period = tinfo->goal.period;
2462  unsigned int width = tinfo->goal.width;
2463  unsigned long flags;
2464  const struct ahc_syncrate *syncrate;
2465 
2466  if (dt && spi_max_width(starget)) {
2467  ppr_options |= MSG_EXT_PPR_DT_REQ;
2468  if (!width)
2469  ahc_linux_set_width(starget, 1);
2470  } else if (period == 9)
2471  period = 10; /* if resetting DT, period must be >= 25ns */
2472 
2473  ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2474  starget->channel + 'A', ROLE_INITIATOR);
2475  syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2476  ahc_lock(ahc, &flags);
2477  ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2478  ppr_options, AHC_TRANS_GOAL, FALSE);
2479  ahc_unlock(ahc, &flags);
2480 }
2481 
2482 #if 0
2483 /* FIXME: This code claims to support IU and QAS. However, the actual
2484  * sequencer code and aic7xxx_core have no support for these parameters and
2485  * will get into a bad state if they're negotiated. Do not enable this
2486  * unless you know what you're doing */
2487 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2488 {
2489  struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2490  struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2491  struct ahc_tmode_tstate *tstate;
2492  struct ahc_initiator_tinfo *tinfo
2493  = ahc_fetch_transinfo(ahc,
2494  starget->channel + 'A',
2495  shost->this_id, starget->id, &tstate);
2496  struct ahc_devinfo devinfo;
2497  unsigned int ppr_options = tinfo->goal.ppr_options
2498  & ~MSG_EXT_PPR_QAS_REQ;
2499  unsigned int period = tinfo->goal.period;
2500  unsigned long flags;
2501  struct ahc_syncrate *syncrate;
2502 
2503  if (qas)
2504  ppr_options |= MSG_EXT_PPR_QAS_REQ;
2505 
2506  ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2507  starget->channel + 'A', ROLE_INITIATOR);
2508  syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2509  ahc_lock(ahc, &flags);
2510  ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2511  ppr_options, AHC_TRANS_GOAL, FALSE);
2512  ahc_unlock(ahc, &flags);
2513 }
2514 
2515 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2516 {
2517  struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2518  struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2519  struct ahc_tmode_tstate *tstate;
2520  struct ahc_initiator_tinfo *tinfo
2521  = ahc_fetch_transinfo(ahc,
2522  starget->channel + 'A',
2523  shost->this_id, starget->id, &tstate);
2524  struct ahc_devinfo devinfo;
2525  unsigned int ppr_options = tinfo->goal.ppr_options
2526  & ~MSG_EXT_PPR_IU_REQ;
2527  unsigned int period = tinfo->goal.period;
2528  unsigned long flags;
2529  struct ahc_syncrate *syncrate;
2530 
2531  if (iu)
2532  ppr_options |= MSG_EXT_PPR_IU_REQ;
2533 
2534  ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2535  starget->channel + 'A', ROLE_INITIATOR);
2536  syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2537  ahc_lock(ahc, &flags);
2538  ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2539  ppr_options, AHC_TRANS_GOAL, FALSE);
2540  ahc_unlock(ahc, &flags);
2541 }
2542 #endif
2543 
2544 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2545 {
2546  struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2547  unsigned long flags;
2548  u8 mode;
2549 
2550  if (!(ahc->features & AHC_ULTRA2)) {
2551  /* non-LVD chipset, may not have SBLKCTL reg */
2552  spi_signalling(shost) =
2553  ahc->features & AHC_HVD ?
2554  SPI_SIGNAL_HVD :
2555  SPI_SIGNAL_SE;
2556  return;
2557  }
2558 
2559  ahc_lock(ahc, &flags);
2560  ahc_pause(ahc);
2561  mode = ahc_inb(ahc, SBLKCTL);
2562  ahc_unpause(ahc);
2563  ahc_unlock(ahc, &flags);
2564 
2565  if (mode & ENAB40)
2566  spi_signalling(shost) = SPI_SIGNAL_LVD;
2567  else if (mode & ENAB20)
2568  spi_signalling(shost) = SPI_SIGNAL_SE;
2569  else
2570  spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2571 }
2572 
2573 static struct spi_function_template ahc_linux_transport_functions = {
2574  .set_offset = ahc_linux_set_offset,
2575  .show_offset = 1,
2576  .set_period = ahc_linux_set_period,
2577  .show_period = 1,
2578  .set_width = ahc_linux_set_width,
2579  .show_width = 1,
2580  .set_dt = ahc_linux_set_dt,
2581  .show_dt = 1,
2582 #if 0
2583  .set_iu = ahc_linux_set_iu,
2584  .show_iu = 1,
2585  .set_qas = ahc_linux_set_qas,
2586  .show_qas = 1,
2587 #endif
2588  .get_signalling = ahc_linux_get_signalling,
2589 };
2590 
2591 
2592 
2593 static int __init
2594 ahc_linux_init(void)
2595 {
2596  /*
2597  * If we've been passed any parameters, process them now.
2598  */
2599  if (aic7xxx)
2600  aic7xxx_setup(aic7xxx);
2601 
2602  ahc_linux_transport_template =
2603  spi_attach_transport(&ahc_linux_transport_functions);
2604  if (!ahc_linux_transport_template)
2605  return -ENODEV;
2606 
2607  scsi_transport_reserve_device(ahc_linux_transport_template,
2608  sizeof(struct ahc_linux_device));
2609 
2610  ahc_linux_pci_init();
2611  ahc_linux_eisa_init();
2612  return 0;
2613 }
2614 
2615 static void
2616 ahc_linux_exit(void)
2617 {
2618  ahc_linux_pci_exit();
2619  ahc_linux_eisa_exit();
2620  spi_release_transport(ahc_linux_transport_template);
2621 }
2622 
2623 module_init(ahc_linux_init);
2624 module_exit(ahc_linux_exit);
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