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 #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
 133
 134 /*
 135  * Set this to the delay in seconds after SCSI bus reset.
 136  * Note, we honor this only for the initial bus reset.
 137  * The scsi error recovery code performs its own bus settle
 138  * delay handling for error recovery actions.
 139  */
 140 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 141 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #else
 143 #define AIC7XXX_RESET_DELAY 5000
 144 #endif
 145
 146 /*
 147  * Control collection of SCSI transfer statistics for the /proc filesystem.
 148  *
 149  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 150  * NOTE: This does affect performance since it has to maintain statistics.
 151  */
 152 #ifdef CONFIG_AIC7XXX_PROC_STATS
 153 #define AIC7XXX_PROC_STATS
 154 #endif
 155
 156 /*
 157  * To change the default number of tagged transactions allowed per-device,
 158  * add a line to the lilo.conf file like:
 159  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 160  * which will result in the first four devices on the first two
 161  * controllers being set to a tagged queue depth of 32.
 162  *
 163  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 164  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 165  * for channel 1.
 166  */
 167 typedef struct {
 168         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 169 } adapter_tag_info_t;
 170
 171 /*
 172  * Modify this as you see fit for your system.
 173  *
 174  * 0                    tagged queuing disabled
 175  * 1 <= n <= 253        n == max tags ever dispatched.
 176  *
 177  * The driver will throttle the number of commands dispatched to a
 178  * device if it returns queue full.  For devices with a fixed maximum
 179  * queue depth, the driver will eventually determine this depth and
 180  * lock it in (a console message is printed to indicate that a lock
 181  * has occurred).  On some devices, queue full is returned for a temporary
 182  * resource shortage.  These devices will return queue full at varying
 183  * depths.  The driver will throttle back when the queue fulls occur and
 184  * attempt to slowly increase the depth over time as the device recovers
 185  * from the resource shortage.
 186  *
 187  * In this example, the first line will disable tagged queueing for all
 188  * the devices on the first probed aic7xxx adapter.
 189  *
 190  * The second line enables tagged queueing with 4 commands/LUN for IDs
 191  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 192  * driver to attempt to use up to 64 tags for ID 1.
 193  *
 194  * The third line is the same as the first line.
 195  *
 196  * The fourth line disables tagged queueing for devices 0 and 3.  It
 197  * enables tagged queueing for the other IDs, with 16 commands/LUN
 198  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 199  * IDs 2, 5-7, and 9-15.
 200  */
 201
 202 /*
 203  * NOTE: The below structure is for reference only, the actual structure
 204  *       to modify in order to change things is just below this comment block.
 205 adapter_tag_info_t aic7xxx_tag_info[] =
 206 {
 207         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 208         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 209         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 210         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 211 };
 212 */
 213
 214 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 215 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 216 #else
 217 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 218 #endif
 219
 220 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 221         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 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 }
 230
 231 /*
 232  * By default, use the number of commands specified by
 233  * the users kernel configuration.
 234  */
 235 static adapter_tag_info_t aic7xxx_tag_info[] =
 236 {
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 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 };
 254
 255 /*
 256  * There should be a specific return value for this in scsi.h, but
 257  * it seems that most drivers ignore it.
 258  */
 259 #define DID_UNDERFLOW   DID_ERROR
 260
 261 void
 262 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 263 {
 264         printk("(scsi%d:%c:%d:%d): ",
 265                ahc->platform_data->host->host_no,
 266                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 267                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 268                scb != NULL ? SCB_GET_LUN(scb) : -1);
 269 }
 270
 271 /*
 272  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 273  *       cards in the system.  This should be fixed.  Exceptions to this
 274  *       rule are noted in the comments.
 275  */
 276
 277 /*
 278  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 279  * has no effect on any later resets that might occur due to things like
 280  * SCSI bus timeouts.
 281  */
 282 static uint32_t aic7xxx_no_reset;
 283
 284 /*
 285  * Should we force EXTENDED translation on a controller.
 286  *     0 == Use whatever is in the SEEPROM or default to off
 287  *     1 == Use whatever is in the SEEPROM or default to on
 288  */
 289 static uint32_t aic7xxx_extended;
 290
 291 /*
 292  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 293  * dubious at best.  To my knowledge, this option has never actually
 294  * solved a PCI parity problem, but on certain machines with broken PCI
 295  * chipset configurations where stray PCI transactions with bad parity are
 296  * the norm rather than the exception, the error messages can be overwelming.
 297  * It's included in the driver for completeness.
 298  *   0     = Shut off PCI parity check
 299  *   non-0 = reverse polarity pci parity checking
 300  */
 301 static uint32_t aic7xxx_pci_parity = ~0;
 302
 303 /*
 304  * There are lots of broken chipsets in the world.  Some of them will
 305  * violate the PCI spec when we issue byte sized memory writes to our
 306  * controller.  I/O mapped register access, if allowed by the given
 307  * platform, will work in almost all cases.
 308  */
 309 uint32_t aic7xxx_allow_memio = ~0;
 310
 311 /*
 312  * So that we can set how long each device is given as a selection timeout.
 313  * The table of values goes like this:
 314  *   0 - 256ms
 315  *   1 - 128ms
 316  *   2 - 64ms
 317  *   3 - 32ms
 318  * We default to 256ms because some older devices need a longer time
 319  * to respond to initial selection.
 320  */
 321 static uint32_t aic7xxx_seltime;
 322
 323 /*
 324  * Certain devices do not perform any aging on commands.  Should the
 325  * device be saturated by commands in one portion of the disk, it is
 326  * possible for transactions on far away sectors to never be serviced.
 327  * To handle these devices, we can periodically send an ordered tag to
 328  * force all outstanding transactions to be serviced prior to a new
 329  * transaction.
 330  */
 331 static uint32_t aic7xxx_periodic_otag;
 332
 333 /*
 334  * Module information and settable options.
 335  */
 336 static char *aic7xxx = NULL;
 337
 338 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 339 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
 340 MODULE_LICENSE("Dual BSD/GPL");
 341 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 342 module_param(aic7xxx, charp, 0444);
 343 MODULE_PARM_DESC(aic7xxx,
 344 "period-delimited options string:\n"
 345 "       verbose                 Enable verbose/diagnostic logging\n"
 346 "       allow_memio             Allow device registers to be memory mapped\n"
 347 "       debug                   Bitmask of debug values to enable\n"
 348 "       no_probe                Toggle EISA/VLB controller probing\n"
 349 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 350 "       no_reset                Supress initial bus resets\n"
 351 "       extended                Enable extended geometry on all controllers\n"
 352 "       periodic_otag           Send an ordered tagged transaction\n"
 353 "                               periodically to prevent tag starvation.\n"
 354 "                               This may be required by some older disk\n"
 355 "                               drives or RAID arrays.\n"
 356 "       tag_info:<tag_str>      Set per-target tag depth\n"
 357 "       global_tag_depth:<int>  Global tag depth for every target\n"
 358 "                               on every bus\n"
 359 "       seltime:<int>           Selection Timeout\n"
 360 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 361 "\n"
 362 "       Sample /etc/modprobe.conf line:\n"
 363 "               Toggle EISA/VLB probing\n"
 364 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 365 "               Shorten the selection timeout to 128ms\n"
 366 "\n"
 367 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 368 );
 369
 370 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 371                                          struct scsi_device *,
 372                                          struct scb *);
 373 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 374                                          struct scsi_cmnd *cmd);
 375 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 376 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 377 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 378 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 379 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 380                                      struct ahc_devinfo *devinfo);
 381 static void ahc_linux_device_queue_depth(struct scsi_device *);
 382 static int ahc_linux_run_command(struct ahc_softc*,
 383                                  struct ahc_linux_device *,
 384                                  struct scsi_cmnd *);
 385 static void ahc_linux_setup_tag_info_global(char *p);
 386 static int  aic7xxx_setup(char *s);
 387
 388 static int ahc_linux_unit;
 389
 390
 391 /********************************* Inlines ************************************/
 392 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 393
 394 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 395                                       struct ahc_dma_seg *sg,
 396                                       dma_addr_t addr, bus_size_t len);
 397
 398 static __inline void
 399 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 400 {
 401         struct scsi_cmnd *cmd;
 402
 403         cmd = scb->io_ctx;
 404         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 405
 406         scsi_dma_unmap(cmd);
 407 }
 408
 409 static __inline int
 410 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 411                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 412 {
 413         int      consumed;
 414
 415         if ((scb->sg_count + 1) > AHC_NSEG)
 416                 panic("Too few segs for dma mapping.  "
 417                       "Increase AHC_NSEG\n");
 418
 419         consumed = 1;
 420         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 421         scb->platform_data->xfer_len += len;
 422
 423         if (sizeof(dma_addr_t) > 4
 424          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 425                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 426
 427         sg->len = ahc_htole32(len);
 428         return (consumed);
 429 }
 430
 431 /*
 432  * Return a string describing the driver.
 433  */
 434 static const char *
 435 ahc_linux_info(struct Scsi_Host *host)
 436 {
 437         static char buffer[512];
 438         char    ahc_info[256];
 439         char   *bp;
 440         struct ahc_softc *ahc;
 441
 442         bp = &buffer[0];
 443         ahc = *(struct ahc_softc **)host->hostdata;
 444         memset(bp, 0, sizeof(buffer));
 445         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 446         strcat(bp, AIC7XXX_DRIVER_VERSION);
 447         strcat(bp, "\n");
 448         strcat(bp, "        <");
 449         strcat(bp, ahc->description);
 450         strcat(bp, ">\n");
 451         strcat(bp, "        ");
 452         ahc_controller_info(ahc, ahc_info);
 453         strcat(bp, ahc_info);
 454         strcat(bp, "\n");
 455
 456         return (bp);
 457 }
 458
 459 /*
 460  * Queue an SCB to the controller.
 461  */
 462 static int
 463 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 464 {
 465         struct   ahc_softc *ahc;
 466         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 467         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 468         unsigned long flags;
 469
 470         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 471
 472         ahc_lock(ahc, &flags);
 473         if (ahc->platform_data->qfrozen == 0) {
 474                 cmd->scsi_done = scsi_done;
 475                 cmd->result = CAM_REQ_INPROG << 16;
 476                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 477         }
 478         ahc_unlock(ahc, &flags);
 479
 480         return rtn;
 481 }
 482
 483 static inline struct scsi_target **
 484 ahc_linux_target_in_softc(struct scsi_target *starget)
 485 {
 486         struct  ahc_softc *ahc =
 487                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 488         unsigned int target_offset;
 489
 490         target_offset = starget->id;
 491         if (starget->channel != 0)
 492                 target_offset += 8;
 493
 494         return &ahc->platform_data->starget[target_offset];
 495 }
 496
 497 static int
 498 ahc_linux_target_alloc(struct scsi_target *starget)
 499 {
 500         struct  ahc_softc *ahc =
 501                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 502         struct seeprom_config *sc = ahc->seep_config;
 503         unsigned long flags;
 504         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 505         unsigned short scsirate;
 506         struct ahc_devinfo devinfo;
 507         struct ahc_initiator_tinfo *tinfo;
 508         struct ahc_tmode_tstate *tstate;
 509         char channel = starget->channel + 'A';
 510         unsigned int our_id = ahc->our_id;
 511         unsigned int target_offset;
 512
 513         target_offset = starget->id;
 514         if (starget->channel != 0)
 515                 target_offset += 8;
 516
 517         if (starget->channel)
 518                 our_id = ahc->our_id_b;
 519
 520         ahc_lock(ahc, &flags);
 521
 522         BUG_ON(*ahc_targp != NULL);
 523
 524         *ahc_targp = starget;
 525
 526         if (sc) {
 527                 int maxsync = AHC_SYNCRATE_DT;
 528                 int ultra = 0;
 529                 int flags = sc->device_flags[target_offset];
 530
 531                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 532                     if (flags & CFSYNCHISULTRA)
 533                         ultra = 1;
 534                 } else if (flags & CFULTRAEN)
 535                         ultra = 1;
 536                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 537                  * change it to ultra=0, CFXFER = 0 */
 538                 if(ultra && (flags & CFXFER) == 0x04) {
 539                         ultra = 0;
 540                         flags &= ~CFXFER;
 541                 }
 542
 543                 if ((ahc->features & AHC_ULTRA2) != 0) {
 544                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 545                 } else {
 546                         scsirate = (flags & CFXFER) << 4;
 547                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 548                                 AHC_SYNCRATE_FAST;
 549                 }
 550                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 551                 if (!(flags & CFSYNCH))
 552                         spi_max_offset(starget) = 0;
 553                 spi_min_period(starget) =
 554                         ahc_find_period(ahc, scsirate, maxsync);
 555
 556                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 557                                             starget->id, &tstate);
 558         }
 559         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 560                             CAM_LUN_WILDCARD, channel,
 561                             ROLE_INITIATOR);
 562         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 563                          AHC_TRANS_GOAL, /*paused*/FALSE);
 564         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 565                       AHC_TRANS_GOAL, /*paused*/FALSE);
 566         ahc_unlock(ahc, &flags);
 567
 568         return 0;
 569 }
 570
 571 static void
 572 ahc_linux_target_destroy(struct scsi_target *starget)
 573 {
 574         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 575
 576         *ahc_targp = NULL;
 577 }
 578
 579 static int
 580 ahc_linux_slave_alloc(struct scsi_device *sdev)
 581 {
 582         struct  ahc_softc *ahc =
 583                 *((struct ahc_softc **)sdev->host->hostdata);
 584         struct scsi_target *starget = sdev->sdev_target;
 585         struct ahc_linux_device *dev;
 586
 587         if (bootverbose)
 588                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 589
 590         dev = scsi_transport_device_data(sdev);
 591         memset(dev, 0, sizeof(*dev));
 592
 593         /*
 594          * We start out life using untagged
 595          * transactions of which we allow one.
 596          */
 597         dev->openings = 1;
 598
 599         /*
 600          * Set maxtags to 0.  This will be changed if we
 601          * later determine that we are dealing with
 602          * a tagged queuing capable device.
 603          */
 604         dev->maxtags = 0;
 605
 606         spi_period(starget) = 0;
 607
 608         return 0;
 609 }
 610
 611 static int
 612 ahc_linux_slave_configure(struct scsi_device *sdev)
 613 {
 614         struct  ahc_softc *ahc;
 615
 616         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 617
 618         if (bootverbose)
 619                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 620
 621         ahc_linux_device_queue_depth(sdev);
 622
 623         /* Initial Domain Validation */
 624         if (!spi_initial_dv(sdev->sdev_target))
 625                 spi_dv_device(sdev);
 626
 627         return 0;
 628 }
 629
 630 #if defined(__i386__)
 631 /*
 632  * Return the disk geometry for the given SCSI device.
 633  */
 634 static int
 635 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 636                     sector_t capacity, int geom[])
 637 {
 638         uint8_t *bh;
 639         int      heads;
 640         int      sectors;
 641         int      cylinders;
 642         int      ret;
 643         int      extended;
 644         struct   ahc_softc *ahc;
 645         u_int    channel;
 646
 647         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 648         channel = sdev_channel(sdev);
 649
 650         bh = scsi_bios_ptable(bdev);
 651         if (bh) {
 652                 ret = scsi_partsize(bh, capacity,
 653                                     &geom[2], &geom[0], &geom[1]);
 654                 kfree(bh);
 655                 if (ret != -1)
 656                         return (ret);
 657         }
 658         heads = 64;
 659         sectors = 32;
 660         cylinders = aic_sector_div(capacity, heads, sectors);
 661
 662         if (aic7xxx_extended != 0)
 663                 extended = 1;
 664         else if (channel == 0)
 665                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 666         else
 667                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 668         if (extended && cylinders >= 1024) {
 669                 heads = 255;
 670                 sectors = 63;
 671                 cylinders = aic_sector_div(capacity, heads, sectors);
 672         }
 673         geom[0] = heads;
 674         geom[1] = sectors;
 675         geom[2] = cylinders;
 676         return (0);
 677 }
 678 #endif
 679
 680 /*
 681  * Abort the current SCSI command(s).
 682  */
 683 static int
 684 ahc_linux_abort(struct scsi_cmnd *cmd)
 685 {
 686         int error;
 687
 688         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 689         if (error != 0)
 690                 printf("aic7xxx_abort returns 0x%x\n", error);
 691         return (error);
 692 }
 693
 694 /*
 695  * Attempt to send a target reset message to the device that timed out.
 696  */
 697 static int
 698 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 699 {
 700         int error;
 701
 702         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 703         if (error != 0)
 704                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 705         return (error);
 706 }
 707
 708 /*
 709  * Reset the SCSI bus.
 710  */
 711 static int
 712 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 713 {
 714         struct ahc_softc *ahc;
 715         int    found;
 716         unsigned long flags;
 717
 718         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 719
 720         ahc_lock(ahc, &flags);
 721         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 722                                   /*initiate reset*/TRUE);
 723         ahc_unlock(ahc, &flags);
 724
 725         if (bootverbose)
 726                 printf("%s: SCSI bus reset delivered. "
 727                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 728
 729         return SUCCESS;
 730 }
 731
 732 struct scsi_host_template aic7xxx_driver_template = {
 733         .module                 = THIS_MODULE,
 734         .name                   = "aic7xxx",
 735         .proc_name              = "aic7xxx",
 736         .proc_info              = ahc_linux_proc_info,
 737         .info                   = ahc_linux_info,
 738         .queuecommand           = ahc_linux_queue,
 739         .eh_abort_handler       = ahc_linux_abort,
 740         .eh_device_reset_handler = ahc_linux_dev_reset,
 741         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 742 #if defined(__i386__)
 743         .bios_param             = ahc_linux_biosparam,
 744 #endif
 745         .can_queue              = AHC_MAX_QUEUE,
 746         .this_id                = -1,
 747         .max_sectors            = 8192,
 748         .cmd_per_lun            = 2,
 749         .use_clustering         = ENABLE_CLUSTERING,
 750         .use_sg_chaining        = ENABLE_SG_CHAINING,
 751         .slave_alloc            = ahc_linux_slave_alloc,
 752         .slave_configure        = ahc_linux_slave_configure,
 753         .target_alloc           = ahc_linux_target_alloc,
 754         .target_destroy         = ahc_linux_target_destroy,
 755 };
 756
 757 /**************************** Tasklet Handler *********************************/
 758
 759 /******************************** Macros **************************************/
 760 #define BUILD_SCSIID(ahc, cmd)                                              \
 761         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 762         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 763         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 764
 765 /******************************** Bus DMA *************************************/
 766 int
 767 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 768                    bus_size_t alignment, bus_size_t boundary,
 769                    dma_addr_t lowaddr, dma_addr_t highaddr,
 770                    bus_dma_filter_t *filter, void *filterarg,
 771                    bus_size_t maxsize, int nsegments,
 772                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 773 {
 774         bus_dma_tag_t dmat;
 775
 776         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 777         if (dmat == NULL)
 778                 return (ENOMEM);
 779
 780         /*
 781          * Linux is very simplistic about DMA memory.  For now don't
 782          * maintain all specification information.  Once Linux supplies
 783          * better facilities for doing these operations, or the
 784          * needs of this particular driver change, we might need to do
 785          * more here.
 786          */
 787         dmat->alignment = alignment;
 788         dmat->boundary = boundary;
 789         dmat->maxsize = maxsize;
 790         *ret_tag = dmat;
 791         return (0);
 792 }
 793
 794 void
 795 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 796 {
 797         free(dmat, M_DEVBUF);
 798 }
 799
 800 int
 801 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 802                  int flags, bus_dmamap_t *mapp)
 803 {
 804         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 805                                       dmat->maxsize, mapp);
 806         if (*vaddr == NULL)
 807                 return ENOMEM;
 808         return 0;
 809 }
 810
 811 void
 812 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 813                 void* vaddr, bus_dmamap_t map)
 814 {
 815         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 816                             vaddr, map);
 817 }
 818
 819 int
 820 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 821                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 822                 void *cb_arg, int flags)
 823 {
 824         /*
 825          * Assume for now that this will only be used during
 826          * initialization and not for per-transaction buffer mapping.
 827          */
 828         bus_dma_segment_t stack_sg;
 829
 830         stack_sg.ds_addr = map;
 831         stack_sg.ds_len = dmat->maxsize;
 832         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 833         return (0);
 834 }
 835
 836 void
 837 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 838 {
 839 }
 840
 841 int
 842 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 843 {
 844         /* Nothing to do */
 845         return (0);
 846 }
 847
 848 static void
 849 ahc_linux_setup_tag_info_global(char *p)
 850 {
 851         int tags, i, j;
 852
 853         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 854         printf("Setting Global Tags= %d\n", tags);
 855
 856         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 857                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 858                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 859                 }
 860         }
 861 }
 862
 863 static void
 864 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 865 {
 866
 867         if ((instance >= 0) && (targ >= 0)
 868          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 869          && (targ < AHC_NUM_TARGETS)) {
 870                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 871                 if (bootverbose)
 872                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 873         }
 874 }
 875
 876 static char *
 877 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 878                        void (*callback)(u_long, int, int, int32_t),
 879                        u_long callback_arg)
 880 {
 881         char    *tok_end;
 882         char    *tok_end2;
 883         int      i;
 884         int      instance;
 885         int      targ;
 886         int      done;
 887         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 888
 889         /* All options use a ':' name/arg separator */
 890         if (*opt_arg != ':')
 891                 return (opt_arg);
 892         opt_arg++;
 893         instance = -1;
 894         targ = -1;
 895         done = FALSE;
 896         /*
 897          * Restore separator that may be in
 898          * the middle of our option argument.
 899          */
 900         tok_end = strchr(opt_arg, '\0');
 901         if (tok_end < end)
 902                 *tok_end = ',';
 903         while (!done) {
 904                 switch (*opt_arg) {
 905                 case '{':
 906                         if (instance == -1) {
 907                                 instance = 0;
 908                         } else {
 909                                 if (depth > 1) {
 910                                         if (targ == -1)
 911                                                 targ = 0;
 912                                 } else {
 913                                         printf("Malformed Option %s\n",
 914                                                opt_name);
 915                                         done = TRUE;
 916                                 }
 917                         }
 918                         opt_arg++;
 919                         break;
 920                 case '}':
 921                         if (targ != -1)
 922                                 targ = -1;
 923                         else if (instance != -1)
 924                                 instance = -1;
 925                         opt_arg++;
 926                         break;
 927                 case ',':
 928                 case '.':
 929                         if (instance == -1)
 930                                 done = TRUE;
 931                         else if (targ >= 0)
 932                                 targ++;
 933                         else if (instance >= 0)
 934                                 instance++;
 935                         opt_arg++;
 936                         break;
 937                 case '\0':
 938                         done = TRUE;
 939                         break;
 940                 default:
 941                         tok_end = end;
 942                         for (i = 0; tok_list[i]; i++) {
 943                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 944                                 if ((tok_end2) && (tok_end2 < tok_end))
 945                                         tok_end = tok_end2;
 946                         }
 947                         callback(callback_arg, instance, targ,
 948                                  simple_strtol(opt_arg, NULL, 0));
 949                         opt_arg = tok_end;
 950                         break;
 951                 }
 952         }
 953         return (opt_arg);
 954 }
 955
 956 /*
 957  * Handle Linux boot parameters. This routine allows for assigning a value
 958  * to a parameter with a ':' between the parameter and the value.
 959  * ie. aic7xxx=stpwlev:1,extended
 960  */
 961 static int
 962 aic7xxx_setup(char *s)
 963 {
 964         int     i, n;
 965         char   *p;
 966         char   *end;
 967
 968         static struct {
 969                 const char *name;
 970                 uint32_t *flag;
 971         } options[] = {
 972                 { "extended", &aic7xxx_extended },
 973                 { "no_reset", &aic7xxx_no_reset },
 974                 { "verbose", &aic7xxx_verbose },
 975                 { "allow_memio", &aic7xxx_allow_memio},
 976 #ifdef AHC_DEBUG
 977                 { "debug", &ahc_debug },
 978 #endif
 979                 { "periodic_otag", &aic7xxx_periodic_otag },
 980                 { "pci_parity", &aic7xxx_pci_parity },
 981                 { "seltime", &aic7xxx_seltime },
 982                 { "tag_info", NULL },
 983                 { "global_tag_depth", NULL },
 984                 { "dv", NULL }
 985         };
 986
 987         end = strchr(s, '\0');
 988
 989         /*
 990          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
 991          * will never be 0 in this case.
 992          */
 993         n = 0;
 994
 995         while ((p = strsep(&s, ",.")) != NULL) {
 996                 if (*p == '\0')
 997                         continue;
 998                 for (i = 0; i < ARRAY_SIZE(options); i++) {
 999
1000                         n = strlen(options[i].name);
1001                         if (strncmp(options[i].name, p, n) == 0)
1002                                 break;
1003                 }
1004                 if (i == ARRAY_SIZE(options))
1005                         continue;
1006
1007                 if (strncmp(p, "global_tag_depth", n) == 0) {
1008                         ahc_linux_setup_tag_info_global(p + n);
1009                 } else if (strncmp(p, "tag_info", n) == 0) {
1010                         s = ahc_parse_brace_option("tag_info", p + n, end,
1011                             2, ahc_linux_setup_tag_info, 0);
1012                 } else if (p[n] == ':') {
1013                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1014                 } else if (strncmp(p, "verbose", n) == 0) {
1015                         *(options[i].flag) = 1;
1016                 } else {
1017                         *(options[i].flag) ^= 0xFFFFFFFF;
1018                 }
1019         }
1020         return 1;
1021 }
1022
1023 __setup("aic7xxx=", aic7xxx_setup);
1024
1025 uint32_t aic7xxx_verbose;
1026
1027 int
1028 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1029 {
1030         char    buf[80];
1031         struct  Scsi_Host *host;
1032         char    *new_name;
1033         u_long  s;
1034         int     retval;
1035
1036         template->name = ahc->description;
1037         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1038         if (host == NULL)
1039                 return (ENOMEM);
1040
1041         *((struct ahc_softc **)host->hostdata) = ahc;
1042         ahc->platform_data->host = host;
1043         host->can_queue = AHC_MAX_QUEUE;
1044         host->cmd_per_lun = 2;
1045         /* XXX No way to communicate the ID for multiple channels */
1046         host->this_id = ahc->our_id;
1047         host->irq = ahc->platform_data->irq;
1048         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1049         host->max_lun = AHC_NUM_LUNS;
1050         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1051         host->sg_tablesize = AHC_NSEG;
1052         ahc_lock(ahc, &s);
1053         ahc_set_unit(ahc, ahc_linux_unit++);
1054         ahc_unlock(ahc, &s);
1055         sprintf(buf, "scsi%d", host->host_no);
1056         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1057         if (new_name != NULL) {
1058                 strcpy(new_name, buf);
1059                 ahc_set_name(ahc, new_name);
1060         }
1061         host->unique_id = ahc->unit;
1062         ahc_linux_initialize_scsi_bus(ahc);
1063         ahc_intr_enable(ahc, TRUE);
1064
1065         host->transportt = ahc_linux_transport_template;
1066
1067         retval = scsi_add_host(host,
1068                         (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
1069         if (retval) {
1070                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1071                 scsi_host_put(host);
1072                 return retval;
1073         }
1074
1075         scsi_scan_host(host);
1076         return 0;
1077 }
1078
1079 /*
1080  * Place the SCSI bus into a known state by either resetting it,
1081  * or forcing transfer negotiations on the next command to any
1082  * target.
1083  */
1084 void
1085 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1086 {
1087         int i;
1088         int numtarg;
1089         unsigned long s;
1090
1091         i = 0;
1092         numtarg = 0;
1093
1094         ahc_lock(ahc, &s);
1095
1096         if (aic7xxx_no_reset != 0)
1097                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1098
1099         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1100                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1101         else
1102                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1103
1104         if ((ahc->features & AHC_TWIN) != 0) {
1105
1106                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1107                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1108                 } else {
1109                         if (numtarg == 0)
1110                                 i = 8;
1111                         numtarg += 8;
1112                 }
1113         }
1114
1115         /*
1116          * Force negotiation to async for all targets that
1117          * will not see an initial bus reset.
1118          */
1119         for (; i < numtarg; i++) {
1120                 struct ahc_devinfo devinfo;
1121                 struct ahc_initiator_tinfo *tinfo;
1122                 struct ahc_tmode_tstate *tstate;
1123                 u_int our_id;
1124                 u_int target_id;
1125                 char channel;
1126
1127                 channel = 'A';
1128                 our_id = ahc->our_id;
1129                 target_id = i;
1130                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1131                         channel = 'B';
1132                         our_id = ahc->our_id_b;
1133                         target_id = i % 8;
1134                 }
1135                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1136                                             target_id, &tstate);
1137                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1138                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1139                 ahc_update_neg_request(ahc, &devinfo, tstate,
1140                                        tinfo, AHC_NEG_ALWAYS);
1141         }
1142         ahc_unlock(ahc, &s);
1143         /* Give the bus some time to recover */
1144         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1145                 ahc_linux_freeze_simq(ahc);
1146                 msleep(AIC7XXX_RESET_DELAY);
1147                 ahc_linux_release_simq(ahc);
1148         }
1149 }
1150
1151 int
1152 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1153 {
1154
1155         ahc->platform_data =
1156             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1157         if (ahc->platform_data == NULL)
1158                 return (ENOMEM);
1159         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1160         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1161         ahc_lockinit(ahc);
1162         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1163         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1164         if (aic7xxx_pci_parity == 0)
1165                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1166
1167         return (0);
1168 }
1169
1170 void
1171 ahc_platform_free(struct ahc_softc *ahc)
1172 {
1173         struct scsi_target *starget;
1174         int i;
1175
1176         if (ahc->platform_data != NULL) {
1177                 /* destroy all of the device and target objects */
1178                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1179                         starget = ahc->platform_data->starget[i];
1180                         if (starget != NULL) {
1181                                 ahc->platform_data->starget[i] = NULL;
1182                         }
1183                 }
1184
1185                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1186                         free_irq(ahc->platform_data->irq, ahc);
1187                 if (ahc->tag == BUS_SPACE_PIO
1188                  && ahc->bsh.ioport != 0)
1189                         release_region(ahc->bsh.ioport, 256);
1190                 if (ahc->tag == BUS_SPACE_MEMIO
1191                  && ahc->bsh.maddr != NULL) {
1192                         iounmap(ahc->bsh.maddr);
1193                         release_mem_region(ahc->platform_data->mem_busaddr,
1194                                            0x1000);
1195                 }
1196
1197                 if (ahc->platform_data->host)
1198                         scsi_host_put(ahc->platform_data->host);
1199
1200                 free(ahc->platform_data, M_DEVBUF);
1201         }
1202 }
1203
1204 void
1205 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1206 {
1207         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1208                                 SCB_GET_CHANNEL(ahc, scb),
1209                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1210                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1211 }
1212
1213 void
1214 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1215                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1216 {
1217         struct ahc_linux_device *dev;
1218         int was_queuing;
1219         int now_queuing;
1220
1221         if (sdev == NULL)
1222                 return;
1223         dev = scsi_transport_device_data(sdev);
1224
1225         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1226         switch (alg) {
1227         default:
1228         case AHC_QUEUE_NONE:
1229                 now_queuing = 0;
1230                 break;
1231         case AHC_QUEUE_BASIC:
1232                 now_queuing = AHC_DEV_Q_BASIC;
1233                 break;
1234         case AHC_QUEUE_TAGGED:
1235                 now_queuing = AHC_DEV_Q_TAGGED;
1236                 break;
1237         }
1238         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1239          && (was_queuing != now_queuing)
1240          && (dev->active != 0)) {
1241                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1242                 dev->qfrozen++;
1243         }
1244
1245         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1246         if (now_queuing) {
1247                 u_int usertags;
1248
1249                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1250                 if (!was_queuing) {
1251                         /*
1252                          * Start out agressively and allow our
1253                          * dynamic queue depth algorithm to take
1254                          * care of the rest.
1255                          */
1256                         dev->maxtags = usertags;
1257                         dev->openings = dev->maxtags - dev->active;
1258                 }
1259                 if (dev->maxtags == 0) {
1260                         /*
1261                          * Queueing is disabled by the user.
1262                          */
1263                         dev->openings = 1;
1264                 } else if (alg == AHC_QUEUE_TAGGED) {
1265                         dev->flags |= AHC_DEV_Q_TAGGED;
1266                         if (aic7xxx_periodic_otag != 0)
1267                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1268                 } else
1269                         dev->flags |= AHC_DEV_Q_BASIC;
1270         } else {
1271                 /* We can only have one opening. */
1272                 dev->maxtags = 0;
1273                 dev->openings =  1 - dev->active;
1274         }
1275         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1276         case AHC_DEV_Q_BASIC:
1277                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1278                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1279                 break;
1280         case AHC_DEV_Q_TAGGED:
1281                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1282                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1283                 break;
1284         default:
1285                 /*
1286                  * We allow the OS to queue 2 untagged transactions to
1287                  * us at any time even though we can only execute them
1288                  * serially on the controller/device.  This should
1289                  * remove some latency.
1290                  */
1291                 scsi_deactivate_tcq(sdev, 2);
1292                 break;
1293         }
1294 }
1295
1296 int
1297 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1298                         int lun, u_int tag, role_t role, uint32_t status)
1299 {
1300         return 0;
1301 }
1302
1303 static u_int
1304 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1305 {
1306         static int warned_user;
1307         u_int tags;
1308
1309         tags = 0;
1310         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1311                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1312                         if (warned_user == 0) {
1313
1314                                 printf(KERN_WARNING
1315 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1316 "aic7xxx: for installed controllers. Using defaults\n"
1317 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1318 "aic7xxx: the aic7xxx_osm..c source file.\n");
1319                                 warned_user++;
1320                         }
1321                         tags = AHC_MAX_QUEUE;
1322                 } else {
1323                         adapter_tag_info_t *tag_info;
1324
1325                         tag_info = &aic7xxx_tag_info[ahc->unit];
1326                         tags = tag_info->tag_commands[devinfo->target_offset];
1327                         if (tags > AHC_MAX_QUEUE)
1328                                 tags = AHC_MAX_QUEUE;
1329                 }
1330         }
1331         return (tags);
1332 }
1333
1334 /*
1335  * Determines the queue depth for a given device.
1336  */
1337 static void
1338 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1339 {
1340         struct  ahc_devinfo devinfo;
1341         u_int   tags;
1342         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1343
1344         ahc_compile_devinfo(&devinfo,
1345                             sdev->sdev_target->channel == 0
1346                           ? ahc->our_id : ahc->our_id_b,
1347                             sdev->sdev_target->id, sdev->lun,
1348                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1349                             ROLE_INITIATOR);
1350         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1351         if (tags != 0 && sdev->tagged_supported != 0) {
1352
1353                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1354                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1355                                devinfo.lun, AC_TRANSFER_NEG);
1356                 ahc_print_devinfo(ahc, &devinfo);
1357                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1358         } else {
1359                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1360                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1361                                devinfo.lun, AC_TRANSFER_NEG);
1362         }
1363 }
1364
1365 static int
1366 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1367                       struct scsi_cmnd *cmd)
1368 {
1369         struct   scb *scb;
1370         struct   hardware_scb *hscb;
1371         struct   ahc_initiator_tinfo *tinfo;
1372         struct   ahc_tmode_tstate *tstate;
1373         uint16_t mask;
1374         struct scb_tailq *untagged_q = NULL;
1375         int nseg;
1376
1377         /*
1378          * Schedule us to run later.  The only reason we are not
1379          * running is because the whole controller Q is frozen.
1380          */
1381         if (ahc->platform_data->qfrozen != 0)
1382                 return SCSI_MLQUEUE_HOST_BUSY;
1383
1384         /*
1385          * We only allow one untagged transaction
1386          * per target in the initiator role unless
1387          * we are storing a full busy target *lun*
1388          * table in SCB space.
1389          */
1390         if (!blk_rq_tagged(cmd->request)
1391             && (ahc->features & AHC_SCB_BTT) == 0) {
1392                 int target_offset;
1393
1394                 target_offset = cmd->device->id + cmd->device->channel * 8;
1395                 untagged_q = &(ahc->untagged_queues[target_offset]);
1396                 if (!TAILQ_EMPTY(untagged_q))
1397                         /* if we're already executing an untagged command
1398                          * we're busy to another */
1399                         return SCSI_MLQUEUE_DEVICE_BUSY;
1400         }
1401
1402         /*
1403          * Get an scb to use.
1404          */
1405         scb = ahc_get_scb(ahc);
1406         if (!scb)
1407                 return SCSI_MLQUEUE_HOST_BUSY;
1408
1409         scb->io_ctx = cmd;
1410         scb->platform_data->dev = dev;
1411         hscb = scb->hscb;
1412         cmd->host_scribble = (char *)scb;
1413
1414         /*
1415          * Fill out basics of the HSCB.
1416          */
1417         hscb->control = 0;
1418         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1419         hscb->lun = cmd->device->lun;
1420         mask = SCB_GET_TARGET_MASK(ahc, scb);
1421         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1422                                     SCB_GET_OUR_ID(scb),
1423                                     SCB_GET_TARGET(ahc, scb), &tstate);
1424         hscb->scsirate = tinfo->scsirate;
1425         hscb->scsioffset = tinfo->curr.offset;
1426         if ((tstate->ultraenb & mask) != 0)
1427                 hscb->control |= ULTRAENB;
1428
1429         if ((ahc->user_discenable & mask) != 0)
1430                 hscb->control |= DISCENB;
1431
1432         if ((tstate->auto_negotiate & mask) != 0) {
1433                 scb->flags |= SCB_AUTO_NEGOTIATE;
1434                 scb->hscb->control |= MK_MESSAGE;
1435         }
1436
1437         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1438                 int     msg_bytes;
1439                 uint8_t tag_msgs[2];
1440
1441                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1442                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1443                         hscb->control |= tag_msgs[0];
1444                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1445                                 dev->commands_since_idle_or_otag = 0;
1446                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1447                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1448                         hscb->control |= MSG_ORDERED_TASK;
1449                         dev->commands_since_idle_or_otag = 0;
1450                 } else {
1451                         hscb->control |= MSG_SIMPLE_TASK;
1452                 }
1453         }
1454
1455         hscb->cdb_len = cmd->cmd_len;
1456         if (hscb->cdb_len <= 12) {
1457                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1458         } else {
1459                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1460                 scb->flags |= SCB_CDB32_PTR;
1461         }
1462
1463         scb->platform_data->xfer_len = 0;
1464         ahc_set_residual(scb, 0);
1465         ahc_set_sense_residual(scb, 0);
1466         scb->sg_count = 0;
1467
1468         nseg = scsi_dma_map(cmd);
1469         BUG_ON(nseg < 0);
1470         if (nseg > 0) {
1471                 struct  ahc_dma_seg *sg;
1472                 struct  scatterlist *cur_seg;
1473                 int i;
1474
1475                 /* Copy the segments into the SG list. */
1476                 sg = scb->sg_list;
1477                 /*
1478                  * The sg_count may be larger than nseg if
1479                  * a transfer crosses a 32bit page.
1480                  */
1481                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1482                         dma_addr_t addr;
1483                         bus_size_t len;
1484                         int consumed;
1485
1486                         addr = sg_dma_address(cur_seg);
1487                         len = sg_dma_len(cur_seg);
1488                         consumed = ahc_linux_map_seg(ahc, scb,
1489                                                      sg, addr, len);
1490                         sg += consumed;
1491                         scb->sg_count += consumed;
1492                 }
1493                 sg--;
1494                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1495
1496                 /*
1497                  * Reset the sg list pointer.
1498                  */
1499                 scb->hscb->sgptr =
1500                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1501
1502                 /*
1503                  * Copy the first SG into the "current"
1504                  * data pointer area.
1505                  */
1506                 scb->hscb->dataptr = scb->sg_list->addr;
1507                 scb->hscb->datacnt = scb->sg_list->len;
1508         } else {
1509                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1510                 scb->hscb->dataptr = 0;
1511                 scb->hscb->datacnt = 0;
1512                 scb->sg_count = 0;
1513         }
1514
1515         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1516         dev->openings--;
1517         dev->active++;
1518         dev->commands_issued++;
1519         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1520                 dev->commands_since_idle_or_otag++;
1521
1522         scb->flags |= SCB_ACTIVE;
1523         if (untagged_q) {
1524                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1525                 scb->flags |= SCB_UNTAGGEDQ;
1526         }
1527         ahc_queue_scb(ahc, scb);
1528         return 0;
1529 }
1530
1531 /*
1532  * SCSI controller interrupt handler.
1533  */
1534 irqreturn_t
1535 ahc_linux_isr(int irq, void *dev_id)
1536 {
1537         struct  ahc_softc *ahc;
1538         u_long  flags;
1539         int     ours;
1540
1541         ahc = (struct ahc_softc *) dev_id;
1542         ahc_lock(ahc, &flags);
1543         ours = ahc_intr(ahc);
1544         ahc_unlock(ahc, &flags);
1545         return IRQ_RETVAL(ours);
1546 }
1547
1548 void
1549 ahc_platform_flushwork(struct ahc_softc *ahc)
1550 {
1551
1552 }
1553
1554 void
1555 ahc_send_async(struct ahc_softc *ahc, char channel,
1556                u_int target, u_int lun, ac_code code)
1557 {
1558         switch (code) {
1559         case AC_TRANSFER_NEG:
1560         {
1561                 char    buf[80];
1562                 struct  scsi_target *starget;
1563                 struct  ahc_linux_target *targ;
1564                 struct  info_str info;
1565                 struct  ahc_initiator_tinfo *tinfo;
1566                 struct  ahc_tmode_tstate *tstate;
1567                 int     target_offset;
1568                 unsigned int target_ppr_options;
1569
1570                 BUG_ON(target == CAM_TARGET_WILDCARD);
1571
1572                 info.buffer = buf;
1573                 info.length = sizeof(buf);
1574                 info.offset = 0;
1575                 info.pos = 0;
1576                 tinfo = ahc_fetch_transinfo(ahc, channel,
1577                                                 channel == 'A' ? ahc->our_id
1578                                                                : ahc->our_id_b,
1579                                                 target, &tstate);
1580
1581                 /*
1582                  * Don't bother reporting results while
1583                  * negotiations are still pending.
1584                  */
1585                 if (tinfo->curr.period != tinfo->goal.period
1586                  || tinfo->curr.width != tinfo->goal.width
1587                  || tinfo->curr.offset != tinfo->goal.offset
1588                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1589                         if (bootverbose == 0)
1590                                 break;
1591
1592                 /*
1593                  * Don't bother reporting results that
1594                  * are identical to those last reported.
1595                  */
1596                 target_offset = target;
1597                 if (channel == 'B')
1598                         target_offset += 8;
1599                 starget = ahc->platform_data->starget[target_offset];
1600                 if (starget == NULL)
1601                         break;
1602                 targ = scsi_transport_target_data(starget);
1603
1604                 target_ppr_options =
1605                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1606                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1607                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1608
1609                 if (tinfo->curr.period == spi_period(starget)
1610                     && tinfo->curr.width == spi_width(starget)
1611                     && tinfo->curr.offset == spi_offset(starget)
1612                  && tinfo->curr.ppr_options == target_ppr_options)
1613                         if (bootverbose == 0)
1614                                 break;
1615
1616                 spi_period(starget) = tinfo->curr.period;
1617                 spi_width(starget) = tinfo->curr.width;
1618                 spi_offset(starget) = tinfo->curr.offset;
1619                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1620                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1621                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1622                 spi_display_xfer_agreement(starget);
1623                 break;
1624         }
1625         case AC_SENT_BDR:
1626         {
1627                 WARN_ON(lun != CAM_LUN_WILDCARD);
1628                 scsi_report_device_reset(ahc->platform_data->host,
1629                                          channel - 'A', target);
1630                 break;
1631         }
1632         case AC_BUS_RESET:
1633                 if (ahc->platform_data->host != NULL) {
1634                         scsi_report_bus_reset(ahc->platform_data->host,
1635                                               channel - 'A');
1636                 }
1637                 break;
1638         default:
1639                 panic("ahc_send_async: Unexpected async event");
1640         }
1641 }
1642
1643 /*
1644  * Calls the higher level scsi done function and frees the scb.
1645  */
1646 void
1647 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1648 {
1649         struct scsi_cmnd *cmd;
1650         struct     ahc_linux_device *dev;
1651
1652         LIST_REMOVE(scb, pending_links);
1653         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1654                 struct scb_tailq *untagged_q;
1655                 int target_offset;
1656
1657                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1658                 untagged_q = &(ahc->untagged_queues[target_offset]);
1659                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1660                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1661         }
1662
1663         if ((scb->flags & SCB_ACTIVE) == 0) {
1664                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1665                 ahc_dump_card_state(ahc);
1666                 panic("Stopping for safety");
1667         }
1668         cmd = scb->io_ctx;
1669         dev = scb->platform_data->dev;
1670         dev->active--;
1671         dev->openings++;
1672         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1673                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1674                 dev->qfrozen--;
1675         }
1676         ahc_linux_unmap_scb(ahc, scb);
1677
1678         /*
1679          * Guard against stale sense data.
1680          * The Linux mid-layer assumes that sense
1681          * was retrieved anytime the first byte of
1682          * the sense buffer looks "sane".
1683          */
1684         cmd->sense_buffer[0] = 0;
1685         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1686                 uint32_t amount_xferred;
1687
1688                 amount_xferred =
1689                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1690                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1691 #ifdef AHC_DEBUG
1692                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1693                                 ahc_print_path(ahc, scb);
1694                                 printf("Set CAM_UNCOR_PARITY\n");
1695                         }
1696 #endif
1697                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1698 #ifdef AHC_REPORT_UNDERFLOWS
1699                 /*
1700                  * This code is disabled by default as some
1701                  * clients of the SCSI system do not properly
1702                  * initialize the underflow parameter.  This
1703                  * results in spurious termination of commands
1704                  * that complete as expected (e.g. underflow is
1705                  * allowed as command can return variable amounts
1706                  * of data.
1707                  */
1708                 } else if (amount_xferred < scb->io_ctx->underflow) {
1709                         u_int i;
1710
1711                         ahc_print_path(ahc, scb);
1712                         printf("CDB:");
1713                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1714                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1715                         printf("\n");
1716                         ahc_print_path(ahc, scb);
1717                         printf("Saw underflow (%ld of %ld bytes). "
1718                                "Treated as error\n",
1719                                 ahc_get_residual(scb),
1720                                 ahc_get_transfer_length(scb));
1721                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1722 #endif
1723                 } else {
1724                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1725                 }
1726         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1727                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1728         }
1729
1730         if (dev->openings == 1
1731          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1732          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1733                 dev->tag_success_count++;
1734         /*
1735          * Some devices deal with temporary internal resource
1736          * shortages by returning queue full.  When the queue
1737          * full occurrs, we throttle back.  Slowly try to get
1738          * back to our previous queue depth.
1739          */
1740         if ((dev->openings + dev->active) < dev->maxtags
1741          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1742                 dev->tag_success_count = 0;
1743                 dev->openings++;
1744         }
1745
1746         if (dev->active == 0)
1747                 dev->commands_since_idle_or_otag = 0;
1748
1749         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1750                 printf("Recovery SCB completes\n");
1751                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1752                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1753                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1754
1755                 if (ahc->platform_data->eh_done)
1756                         complete(ahc->platform_data->eh_done);
1757         }
1758
1759         ahc_free_scb(ahc, scb);
1760         ahc_linux_queue_cmd_complete(ahc, cmd);
1761 }
1762
1763 static void
1764 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1765                              struct scsi_device *sdev, struct scb *scb)
1766 {
1767         struct  ahc_devinfo devinfo;
1768         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1769
1770         ahc_compile_devinfo(&devinfo,
1771                             ahc->our_id,
1772                             sdev->sdev_target->id, sdev->lun,
1773                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1774                             ROLE_INITIATOR);
1775
1776         /*
1777          * We don't currently trust the mid-layer to
1778          * properly deal with queue full or busy.  So,
1779          * when one occurs, we tell the mid-layer to
1780          * unconditionally requeue the command to us
1781          * so that we can retry it ourselves.  We also
1782          * implement our own throttling mechanism so
1783          * we don't clobber the device with too many
1784          * commands.
1785          */
1786         switch (ahc_get_scsi_status(scb)) {
1787         default:
1788                 break;
1789         case SCSI_STATUS_CHECK_COND:
1790         case SCSI_STATUS_CMD_TERMINATED:
1791         {
1792                 struct scsi_cmnd *cmd;
1793
1794                 /*
1795                  * Copy sense information to the OS's cmd
1796                  * structure if it is available.
1797                  */
1798                 cmd = scb->io_ctx;
1799                 if (scb->flags & SCB_SENSE) {
1800                         u_int sense_size;
1801
1802                         sense_size = min(sizeof(struct scsi_sense_data)
1803                                        - ahc_get_sense_residual(scb),
1804                                          (u_long)sizeof(cmd->sense_buffer));
1805                         memcpy(cmd->sense_buffer,
1806                                ahc_get_sense_buf(ahc, scb), sense_size);
1807                         if (sense_size < sizeof(cmd->sense_buffer))
1808                                 memset(&cmd->sense_buffer[sense_size], 0,
1809                                        sizeof(cmd->sense_buffer) - sense_size);
1810                         cmd->result |= (DRIVER_SENSE << 24);
1811 #ifdef AHC_DEBUG
1812                         if (ahc_debug & AHC_SHOW_SENSE) {
1813                                 int i;
1814
1815                                 printf("Copied %d bytes of sense data:",
1816                                        sense_size);
1817                                 for (i = 0; i < sense_size; i++) {
1818                                         if ((i & 0xF) == 0)
1819                                                 printf("\n");
1820                                         printf("0x%x ", cmd->sense_buffer[i]);
1821                                 }
1822                                 printf("\n");
1823                         }
1824 #endif
1825                 }
1826                 break;
1827         }
1828         case SCSI_STATUS_QUEUE_FULL:
1829         {
1830                 /*
1831                  * By the time the core driver has returned this
1832                  * command, all other commands that were queued
1833                  * to us but not the device have been returned.
1834                  * This ensures that dev->active is equal to
1835                  * the number of commands actually queued to
1836                  * the device.
1837                  */
1838                 dev->tag_success_count = 0;
1839                 if (dev->active != 0) {
1840                         /*
1841                          * Drop our opening count to the number
1842                          * of commands currently outstanding.
1843                          */
1844                         dev->openings = 0;
1845 /*
1846                         ahc_print_path(ahc, scb);
1847                         printf("Dropping tag count to %d\n", dev->active);
1848  */
1849                         if (dev->active == dev->tags_on_last_queuefull) {
1850
1851                                 dev->last_queuefull_same_count++;
1852                                 /*
1853                                  * If we repeatedly see a queue full
1854                                  * at the same queue depth, this
1855                                  * device has a fixed number of tag
1856                                  * slots.  Lock in this tag depth
1857                                  * so we stop seeing queue fulls from
1858                                  * this device.
1859                                  */
1860                                 if (dev->last_queuefull_same_count
1861                                  == AHC_LOCK_TAGS_COUNT) {
1862                                         dev->maxtags = dev->active;
1863                                         ahc_print_path(ahc, scb);
1864                                         printf("Locking max tag count at %d\n",
1865                                                dev->active);
1866                                 }
1867                         } else {
1868                                 dev->tags_on_last_queuefull = dev->active;
1869                                 dev->last_queuefull_same_count = 0;
1870                         }
1871                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1872                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1873                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1874                                      (dev->flags & AHC_DEV_Q_BASIC)
1875                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1876                         break;
1877                 }
1878                 /*
1879                  * Drop down to a single opening, and treat this
1880                  * as if the target returned BUSY SCSI status.
1881                  */
1882                 dev->openings = 1;
1883                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1884                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1885                              (dev->flags & AHC_DEV_Q_BASIC)
1886                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1887                 break;
1888         }
1889         }
1890 }
1891
1892 static void
1893 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1894 {
1895         /*
1896          * Map CAM error codes into Linux Error codes.  We
1897          * avoid the conversion so that the DV code has the
1898          * full error information available when making
1899          * state change decisions.
1900          */
1901         {
1902                 u_int new_status;
1903
1904                 switch (ahc_cmd_get_transaction_status(cmd)) {
1905                 case CAM_REQ_INPROG:
1906                 case CAM_REQ_CMP:
1907                 case CAM_SCSI_STATUS_ERROR:
1908                         new_status = DID_OK;
1909                         break;
1910                 case CAM_REQ_ABORTED:
1911                         new_status = DID_ABORT;
1912                         break;
1913                 case CAM_BUSY:
1914                         new_status = DID_BUS_BUSY;
1915                         break;
1916                 case CAM_REQ_INVALID:
1917                 case CAM_PATH_INVALID:
1918                         new_status = DID_BAD_TARGET;
1919                         break;
1920                 case CAM_SEL_TIMEOUT:
1921                         new_status = DID_NO_CONNECT;
1922                         break;
1923                 case CAM_SCSI_BUS_RESET:
1924                 case CAM_BDR_SENT:
1925                         new_status = DID_RESET;
1926                         break;
1927                 case CAM_UNCOR_PARITY:
1928                         new_status = DID_PARITY;
1929                         break;
1930                 case CAM_CMD_TIMEOUT:
1931                         new_status = DID_TIME_OUT;
1932                         break;
1933                 case CAM_UA_ABORT:
1934                 case CAM_REQ_CMP_ERR:
1935                 case CAM_AUTOSENSE_FAIL:
1936                 case CAM_NO_HBA:
1937                 case CAM_DATA_RUN_ERR:
1938                 case CAM_UNEXP_BUSFREE:
1939                 case CAM_SEQUENCE_FAIL:
1940                 case CAM_CCB_LEN_ERR:
1941                 case CAM_PROVIDE_FAIL:
1942                 case CAM_REQ_TERMIO:
1943                 case CAM_UNREC_HBA_ERROR:
1944                 case CAM_REQ_TOO_BIG:
1945                         new_status = DID_ERROR;
1946                         break;
1947                 case CAM_REQUEUE_REQ:
1948                         new_status = DID_REQUEUE;
1949                         break;
1950                 default:
1951                         /* We should never get here */
1952                         new_status = DID_ERROR;
1953                         break;
1954                 }
1955
1956                 ahc_cmd_set_transaction_status(cmd, new_status);
1957         }
1958
1959         cmd->scsi_done(cmd);
1960 }
1961
1962 static void
1963 ahc_linux_freeze_simq(struct ahc_softc *ahc)
1964 {
1965         unsigned long s;
1966
1967         ahc_lock(ahc, &s);
1968         ahc->platform_data->qfrozen++;
1969         if (ahc->platform_data->qfrozen == 1) {
1970                 scsi_block_requests(ahc->platform_data->host);
1971
1972                 /* XXX What about Twin channels? */
1973                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
1974                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
1975                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
1976         }
1977         ahc_unlock(ahc, &s);
1978 }
1979
1980 static void
1981 ahc_linux_release_simq(struct ahc_softc *ahc)
1982 {
1983         u_long s;
1984         int    unblock_reqs;
1985
1986         unblock_reqs = 0;
1987         ahc_lock(ahc, &s);
1988         if (ahc->platform_data->qfrozen > 0)
1989                 ahc->platform_data->qfrozen--;
1990         if (ahc->platform_data->qfrozen == 0)
1991                 unblock_reqs = 1;
1992         ahc_unlock(ahc, &s);
1993         /*
1994          * There is still a race here.  The mid-layer
1995          * should keep its own freeze count and use
1996          * a bottom half handler to run the queues
1997          * so we can unblock with our own lock held.
1998          */
1999         if (unblock_reqs)
2000                 scsi_unblock_requests(ahc->platform_data->host);
2001 }
2002
2003 static int
2004 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2005 {
2006         struct ahc_softc *ahc;
2007         struct ahc_linux_device *dev;
2008         struct scb *pending_scb;
2009         u_int  saved_scbptr;
2010         u_int  active_scb_index;
2011         u_int  last_phase;
2012         u_int  saved_scsiid;
2013         u_int  cdb_byte;
2014         int    retval;
2015         int    was_paused;
2016         int    paused;
2017         int    wait;
2018         int    disconnected;
2019         unsigned long flags;
2020
2021         pending_scb = NULL;
2022         paused = FALSE;
2023         wait = FALSE;
2024         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2025
2026         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2027                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2028
2029         printf("CDB:");
2030         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2031                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2032         printf("\n");
2033
2034         ahc_lock(ahc, &flags);
2035
2036         /*
2037          * First determine if we currently own this command.
2038          * Start by searching the device queue.  If not found
2039          * there, check the pending_scb list.  If not found
2040          * at all, and the system wanted us to just abort the
2041          * command, return success.
2042          */
2043         dev = scsi_transport_device_data(cmd->device);
2044
2045         if (dev == NULL) {
2046                 /*
2047                  * No target device for this command exists,
2048                  * so we must not still own the command.
2049                  */
2050                 printf("%s:%d:%d:%d: Is not an active device\n",
2051                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2052                        cmd->device->lun);
2053                 retval = SUCCESS;
2054                 goto no_cmd;
2055         }
2056
2057         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2058          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2059                                        cmd->device->channel + 'A',
2060                                        cmd->device->lun,
2061                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2062                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2063                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2064                        cmd->device->lun);
2065                 retval = SUCCESS;
2066                 goto done;
2067         }
2068
2069         /*
2070          * See if we can find a matching cmd in the pending list.
2071          */
2072         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2073                 if (pending_scb->io_ctx == cmd)
2074                         break;
2075         }
2076
2077         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2078
2079                 /* Any SCB for this device will do for a target reset */
2080                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2081                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2082                                           scmd_channel(cmd) + 'A',
2083                                           CAM_LUN_WILDCARD,
2084                                           SCB_LIST_NULL, ROLE_INITIATOR))
2085                                 break;
2086                 }
2087         }
2088
2089         if (pending_scb == NULL) {
2090                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2091                 goto no_cmd;
2092         }
2093
2094         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2095                 /*
2096                  * We can't queue two recovery actions using the same SCB
2097                  */
2098                 retval = FAILED;
2099                 goto  done;
2100         }
2101
2102         /*
2103          * Ensure that the card doesn't do anything
2104          * behind our back and that we didn't "just" miss
2105          * an interrupt that would affect this cmd.
2106          */
2107         was_paused = ahc_is_paused(ahc);
2108         ahc_pause_and_flushwork(ahc);
2109         paused = TRUE;
2110
2111         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2112                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2113                 goto no_cmd;
2114         }
2115
2116         printf("%s: At time of recovery, card was %spaused\n",
2117                ahc_name(ahc), was_paused ? "" : "not ");
2118         ahc_dump_card_state(ahc);
2119
2120         disconnected = TRUE;
2121         if (flag == SCB_ABORT) {
2122                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2123                                        cmd->device->channel + 'A',
2124                                        cmd->device->lun,
2125                                        pending_scb->hscb->tag,
2126                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2127                                        SEARCH_COMPLETE) > 0) {
2128                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2129                                ahc_name(ahc), cmd->device->channel,
2130                                         cmd->device->id, cmd->device->lun);
2131                         retval = SUCCESS;
2132                         goto done;
2133                 }
2134         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2135                                       cmd->device->channel + 'A',
2136                                       cmd->device->lun, pending_scb->hscb->tag,
2137                                       ROLE_INITIATOR, /*status*/0,
2138                                       SEARCH_COUNT) > 0) {
2139                 disconnected = FALSE;
2140         }
2141
2142         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2143                 struct scb *bus_scb;
2144
2145                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2146                 if (bus_scb == pending_scb)
2147                         disconnected = FALSE;
2148                 else if (flag != SCB_ABORT
2149                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2150                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2151                         disconnected = FALSE;
2152         }
2153
2154         /*
2155          * At this point, pending_scb is the scb associated with the
2156          * passed in command.  That command is currently active on the
2157          * bus, is in the disconnected state, or we're hoping to find
2158          * a command for the same target active on the bus to abuse to
2159          * send a BDR.  Queue the appropriate message based on which of
2160          * these states we are in.
2161          */
2162         last_phase = ahc_inb(ahc, LASTPHASE);
2163         saved_scbptr = ahc_inb(ahc, SCBPTR);
2164         active_scb_index = ahc_inb(ahc, SCB_TAG);
2165         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2166         if (last_phase != P_BUSFREE
2167          && (pending_scb->hscb->tag == active_scb_index
2168           || (flag == SCB_DEVICE_RESET
2169            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2170
2171                 /*
2172                  * We're active on the bus, so assert ATN
2173                  * and hope that the target responds.
2174                  */
2175                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2176                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2177                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2178                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2179                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2180                 wait = TRUE;
2181         } else if (disconnected) {
2182
2183                 /*
2184                  * Actually re-queue this SCB in an attempt
2185                  * to select the device before it reconnects.
2186                  * In either case (selection or reselection),
2187                  * we will now issue the approprate message
2188                  * to the timed-out device.
2189                  *
2190                  * Set the MK_MESSAGE control bit indicating
2191                  * that we desire to send a message.  We
2192                  * also set the disconnected flag since
2193                  * in the paging case there is no guarantee
2194                  * that our SCB control byte matches the
2195                  * version on the card.  We don't want the
2196                  * sequencer to abort the command thinking
2197                  * an unsolicited reselection occurred.
2198                  */
2199                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2200                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2201
2202                 /*
2203                  * Remove any cached copy of this SCB in the
2204                  * disconnected list in preparation for the
2205                  * queuing of our abort SCB.  We use the
2206                  * same element in the SCB, SCB_NEXT, for
2207                  * both the qinfifo and the disconnected list.
2208                  */
2209                 ahc_search_disc_list(ahc, cmd->device->id,
2210                                      cmd->device->channel + 'A',
2211                                      cmd->device->lun, pending_scb->hscb->tag,
2212                                      /*stop_on_first*/TRUE,
2213                                      /*remove*/TRUE,
2214                                      /*save_state*/FALSE);
2215
2216                 /*
2217                  * In the non-paging case, the sequencer will
2218                  * never re-reference the in-core SCB.
2219                  * To make sure we are notified during
2220                  * reslection, set the MK_MESSAGE flag in
2221                  * the card's copy of the SCB.
2222                  */
2223                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2224                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2225                         ahc_outb(ahc, SCB_CONTROL,
2226                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2227                 }
2228
2229                 /*
2230                  * Clear out any entries in the QINFIFO first
2231                  * so we are the next SCB for this target
2232                  * to run.
2233                  */
2234                 ahc_search_qinfifo(ahc, cmd->device->id,
2235                                    cmd->device->channel + 'A',
2236                                    cmd->device->lun, SCB_LIST_NULL,
2237                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2238                                    SEARCH_COMPLETE);
2239                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2240                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2241                 ahc_print_path(ahc, pending_scb);
2242                 printf("Device is disconnected, re-queuing SCB\n");
2243                 wait = TRUE;
2244         } else {
2245                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2246                 retval = FAILED;
2247                 goto done;
2248         }
2249
2250 no_cmd:
2251         /*
2252          * Our assumption is that if we don't have the command, no
2253          * recovery action was required, so we return success.  Again,
2254          * the semantics of the mid-layer recovery engine are not
2255          * well defined, so this may change in time.
2256          */
2257         retval = SUCCESS;
2258 done:
2259         if (paused)
2260                 ahc_unpause(ahc);
2261         if (wait) {
2262                 DECLARE_COMPLETION_ONSTACK(done);
2263
2264                 ahc->platform_data->eh_done = &done;
2265                 ahc_unlock(ahc, &flags);
2266
2267                 printf("Recovery code sleeping\n");
2268                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2269                         ahc_lock(ahc, &flags);
2270                         ahc->platform_data->eh_done = NULL;
2271                         ahc_unlock(ahc, &flags);
2272
2273                         printf("Timer Expired\n");
2274                         retval = FAILED;
2275                 }
2276                 printf("Recovery code awake\n");
2277         } else
2278                 ahc_unlock(ahc, &flags);
2279         return (retval);
2280 }
2281
2282 void
2283 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2284 {
2285 }
2286
2287 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2288 {
2289         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2290         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2291         struct ahc_devinfo devinfo;
2292         unsigned long flags;
2293
2294         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2295                             starget->channel + 'A', ROLE_INITIATOR);
2296         ahc_lock(ahc, &flags);
2297         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2298         ahc_unlock(ahc, &flags);
2299 }
2300
2301 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2302 {
2303         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2304         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2305         struct ahc_tmode_tstate *tstate;
2306         struct ahc_initiator_tinfo *tinfo
2307                 = ahc_fetch_transinfo(ahc,
2308                                       starget->channel + 'A',
2309                                       shost->this_id, starget->id, &tstate);
2310         struct ahc_devinfo devinfo;
2311         unsigned int ppr_options = tinfo->goal.ppr_options;
2312         unsigned long flags;
2313         unsigned long offset = tinfo->goal.offset;
2314         struct ahc_syncrate *syncrate;
2315
2316         if (offset == 0)
2317                 offset = MAX_OFFSET;
2318
2319         if (period < 9)
2320                 period = 9;     /* 12.5ns is our minimum */
2321         if (period == 9) {
2322                 if (spi_max_width(starget))
2323                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2324                 else
2325                         /* need wide for DT and need DT for 12.5 ns */
2326                         period = 10;
2327         }
2328
2329         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2330                             starget->channel + 'A', ROLE_INITIATOR);
2331
2332         /* all PPR requests apart from QAS require wide transfers */
2333         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2334                 if (spi_width(starget) == 0)
2335                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2336         }
2337
2338         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2339         ahc_lock(ahc, &flags);
2340         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2341                          ppr_options, AHC_TRANS_GOAL, FALSE);
2342         ahc_unlock(ahc, &flags);
2343 }
2344
2345 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2346 {
2347         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2348         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2349         struct ahc_tmode_tstate *tstate;
2350         struct ahc_initiator_tinfo *tinfo
2351                 = ahc_fetch_transinfo(ahc,
2352                                       starget->channel + 'A',
2353                                       shost->this_id, starget->id, &tstate);
2354         struct ahc_devinfo devinfo;
2355         unsigned int ppr_options = 0;
2356         unsigned int period = 0;
2357         unsigned long flags;
2358         struct ahc_syncrate *syncrate = NULL;
2359
2360         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2361                             starget->channel + 'A', ROLE_INITIATOR);
2362         if (offset != 0) {
2363                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2364                 period = tinfo->goal.period;
2365                 ppr_options = tinfo->goal.ppr_options;
2366         }
2367         ahc_lock(ahc, &flags);
2368         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2369                          ppr_options, AHC_TRANS_GOAL, FALSE);
2370         ahc_unlock(ahc, &flags);
2371 }
2372
2373 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2374 {
2375         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2376         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2377         struct ahc_tmode_tstate *tstate;
2378         struct ahc_initiator_tinfo *tinfo
2379                 = ahc_fetch_transinfo(ahc,
2380                                       starget->channel + 'A',
2381                                       shost->this_id, starget->id, &tstate);
2382         struct ahc_devinfo devinfo;
2383         unsigned int ppr_options = tinfo->goal.ppr_options
2384                 & ~MSG_EXT_PPR_DT_REQ;
2385         unsigned int period = tinfo->goal.period;
2386         unsigned int width = tinfo->goal.width;
2387         unsigned long flags;
2388         struct ahc_syncrate *syncrate;
2389
2390         if (dt && spi_max_width(starget)) {
2391                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2392                 if (!width)
2393                         ahc_linux_set_width(starget, 1);
2394         } else if (period == 9)
2395                 period = 10;    /* if resetting DT, period must be >= 25ns */
2396
2397         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2398                             starget->channel + 'A', ROLE_INITIATOR);
2399         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2400         ahc_lock(ahc, &flags);
2401         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2402                          ppr_options, AHC_TRANS_GOAL, FALSE);
2403         ahc_unlock(ahc, &flags);
2404 }
2405
2406 #if 0
2407 /* FIXME: This code claims to support IU and QAS.  However, the actual
2408  * sequencer code and aic7xxx_core have no support for these parameters and
2409  * will get into a bad state if they're negotiated.  Do not enable this
2410  * unless you know what you're doing */
2411 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2412 {
2413         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2414         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2415         struct ahc_tmode_tstate *tstate;
2416         struct ahc_initiator_tinfo *tinfo
2417                 = ahc_fetch_transinfo(ahc,
2418                                       starget->channel + 'A',
2419                                       shost->this_id, starget->id, &tstate);
2420         struct ahc_devinfo devinfo;
2421         unsigned int ppr_options = tinfo->goal.ppr_options
2422                 & ~MSG_EXT_PPR_QAS_REQ;
2423         unsigned int period = tinfo->goal.period;
2424         unsigned long flags;
2425         struct ahc_syncrate *syncrate;
2426
2427         if (qas)
2428                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2429
2430         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2431                             starget->channel + 'A', ROLE_INITIATOR);
2432         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2433         ahc_lock(ahc, &flags);
2434         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2435                          ppr_options, AHC_TRANS_GOAL, FALSE);
2436         ahc_unlock(ahc, &flags);
2437 }
2438
2439 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2440 {
2441         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2442         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2443         struct ahc_tmode_tstate *tstate;
2444         struct ahc_initiator_tinfo *tinfo
2445                 = ahc_fetch_transinfo(ahc,
2446                                       starget->channel + 'A',
2447                                       shost->this_id, starget->id, &tstate);
2448         struct ahc_devinfo devinfo;
2449         unsigned int ppr_options = tinfo->goal.ppr_options
2450                 & ~MSG_EXT_PPR_IU_REQ;
2451         unsigned int period = tinfo->goal.period;
2452         unsigned long flags;
2453         struct ahc_syncrate *syncrate;
2454
2455         if (iu)
2456                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2457
2458         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2459                             starget->channel + 'A', ROLE_INITIATOR);
2460         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2461         ahc_lock(ahc, &flags);
2462         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2463                          ppr_options, AHC_TRANS_GOAL, FALSE);
2464         ahc_unlock(ahc, &flags);
2465 }
2466 #endif
2467
2468 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2469 {
2470         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2471         unsigned long flags;
2472         u8 mode;
2473
2474         if (!(ahc->features & AHC_ULTRA2)) {
2475                 /* non-LVD chipset, may not have SBLKCTL reg */
2476                 spi_signalling(shost) =
2477                         ahc->features & AHC_HVD ?
2478                         SPI_SIGNAL_HVD :
2479                         SPI_SIGNAL_SE;
2480                 return;
2481         }
2482
2483         ahc_lock(ahc, &flags);
2484         ahc_pause(ahc);
2485         mode = ahc_inb(ahc, SBLKCTL);
2486         ahc_unpause(ahc);
2487         ahc_unlock(ahc, &flags);
2488
2489         if (mode & ENAB40)
2490                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2491         else if (mode & ENAB20)
2492                 spi_signalling(shost) = SPI_SIGNAL_SE;
2493         else
2494                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2495 }
2496
2497 static struct spi_function_template ahc_linux_transport_functions = {
2498         .set_offset     = ahc_linux_set_offset,
2499         .show_offset    = 1,
2500         .set_period     = ahc_linux_set_period,
2501         .show_period    = 1,
2502         .set_width      = ahc_linux_set_width,
2503         .show_width     = 1,
2504         .set_dt         = ahc_linux_set_dt,
2505         .show_dt        = 1,
2506 #if 0
2507         .set_iu         = ahc_linux_set_iu,
2508         .show_iu        = 1,
2509         .set_qas        = ahc_linux_set_qas,
2510         .show_qas       = 1,
2511 #endif
2512         .get_signalling = ahc_linux_get_signalling,
2513 };
2514
2515
2516
2517 static int __init
2518 ahc_linux_init(void)
2519 {
2520         /*
2521          * If we've been passed any parameters, process them now.
2522          */
2523         if (aic7xxx)
2524                 aic7xxx_setup(aic7xxx);
2525
2526         ahc_linux_transport_template =
2527                 spi_attach_transport(&ahc_linux_transport_functions);
2528         if (!ahc_linux_transport_template)
2529                 return -ENODEV;
2530
2531         scsi_transport_reserve_device(ahc_linux_transport_template,
2532                                       sizeof(struct ahc_linux_device));
2533
2534         ahc_linux_pci_init();
2535         ahc_linux_eisa_init();
2536         return 0;
2537 }
2538
2539 static void
2540 ahc_linux_exit(void)
2541 {
2542         ahc_linux_pci_exit();
2543         ahc_linux_eisa_exit();
2544         spi_release_transport(ahc_linux_transport_template);
2545 }
2546
2547 module_init(ahc_linux_init);
2548 module_exit(ahc_linux_exit);