Pileus Git - ~andy/linux/blob - 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 #include <linux/slab.h>
 133
 134
 135 /*
 136  * Set this to the delay in seconds after SCSI bus reset.
 137  * Note, we honor this only for the initial bus reset.
 138  * The scsi error recovery code performs its own bus settle
 139  * delay handling for error recovery actions.
 140  */
 141 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 143 #else
 144 #define AIC7XXX_RESET_DELAY 5000
 145 #endif
 146
 147 /*
 148  * Control collection of SCSI transfer statistics for the /proc filesystem.
 149  *
 150  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 151  * NOTE: This does affect performance since it has to maintain statistics.
 152  */
 153 #ifdef CONFIG_AIC7XXX_PROC_STATS
 154 #define AIC7XXX_PROC_STATS
 155 #endif
 156
 157 /*
 158  * To change the default number of tagged transactions allowed per-device,
 159  * add a line to the lilo.conf file like:
 160  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 161  * which will result in the first four devices on the first two
 162  * controllers being set to a tagged queue depth of 32.
 163  *
 164  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 165  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 166  * for channel 1.
 167  */
 168 typedef struct {
 169         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 170 } adapter_tag_info_t;
 171
 172 /*
 173  * Modify this as you see fit for your system.
 174  *
 175  * 0                    tagged queuing disabled
 176  * 1 <= n <= 253        n == max tags ever dispatched.
 177  *
 178  * The driver will throttle the number of commands dispatched to a
 179  * device if it returns queue full.  For devices with a fixed maximum
 180  * queue depth, the driver will eventually determine this depth and
 181  * lock it in (a console message is printed to indicate that a lock
 182  * has occurred).  On some devices, queue full is returned for a temporary
 183  * resource shortage.  These devices will return queue full at varying
 184  * depths.  The driver will throttle back when the queue fulls occur and
 185  * attempt to slowly increase the depth over time as the device recovers
 186  * from the resource shortage.
 187  *
 188  * In this example, the first line will disable tagged queueing for all
 189  * the devices on the first probed aic7xxx adapter.
 190  *
 191  * The second line enables tagged queueing with 4 commands/LUN for IDs
 192  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 193  * driver to attempt to use up to 64 tags for ID 1.
 194  *
 195  * The third line is the same as the first line.
 196  *
 197  * The fourth line disables tagged queueing for devices 0 and 3.  It
 198  * enables tagged queueing for the other IDs, with 16 commands/LUN
 199  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 200  * IDs 2, 5-7, and 9-15.
 201  */
 202
 203 /*
 204  * NOTE: The below structure is for reference only, the actual structure
 205  *       to modify in order to change things is just below this comment block.
 206 adapter_tag_info_t aic7xxx_tag_info[] =
 207 {
 208         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 209         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 210         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 211         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 212 };
 213 */
 214
 215 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 216 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 217 #else
 218 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 219 #endif
 220
 221 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 222         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 223         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 224         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 225         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 226         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 227         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 228         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 229         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 230 }
 231
 232 /*
 233  * By default, use the number of commands specified by
 234  * the users kernel configuration.
 235  */
 236 static adapter_tag_info_t aic7xxx_tag_info[] =
 237 {
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 245         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 246         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 252         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 253         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 254 };
 255
 256 /*
 257  * There should be a specific return value for this in scsi.h, but
 258  * it seems that most drivers ignore it.
 259  */
 260 #define DID_UNDERFLOW   DID_ERROR
 261
 262 void
 263 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 264 {
 265         printk("(scsi%d:%c:%d:%d): ",
 266                ahc->platform_data->host->host_no,
 267                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 268                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 269                scb != NULL ? SCB_GET_LUN(scb) : -1);
 270 }
 271
 272 /*
 273  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 274  *       cards in the system.  This should be fixed.  Exceptions to this
 275  *       rule are noted in the comments.
 276  */
 277
 278 /*
 279  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 280  * has no effect on any later resets that might occur due to things like
 281  * SCSI bus timeouts.
 282  */
 283 static uint32_t aic7xxx_no_reset;
 284
 285 /*
 286  * Should we force EXTENDED translation on a controller.
 287  *     0 == Use whatever is in the SEEPROM or default to off
 288  *     1 == Use whatever is in the SEEPROM or default to on
 289  */
 290 static uint32_t aic7xxx_extended;
 291
 292 /*
 293  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 294  * dubious at best.  To my knowledge, this option has never actually
 295  * solved a PCI parity problem, but on certain machines with broken PCI
 296  * chipset configurations where stray PCI transactions with bad parity are
 297  * the norm rather than the exception, the error messages can be overwhelming.
 298  * It's included in the driver for completeness.
 299  *   0     = Shut off PCI parity check
 300  *   non-0 = reverse polarity pci parity checking
 301  */
 302 static uint32_t aic7xxx_pci_parity = ~0;
 303
 304 /*
 305  * There are lots of broken chipsets in the world.  Some of them will
 306  * violate the PCI spec when we issue byte sized memory writes to our
 307  * controller.  I/O mapped register access, if allowed by the given
 308  * platform, will work in almost all cases.
 309  */
 310 uint32_t aic7xxx_allow_memio = ~0;
 311
 312 /*
 313  * So that we can set how long each device is given as a selection timeout.
 314  * The table of values goes like this:
 315  *   0 - 256ms
 316  *   1 - 128ms
 317  *   2 - 64ms
 318  *   3 - 32ms
 319  * We default to 256ms because some older devices need a longer time
 320  * to respond to initial selection.
 321  */
 322 static uint32_t aic7xxx_seltime;
 323
 324 /*
 325  * Certain devices do not perform any aging on commands.  Should the
 326  * device be saturated by commands in one portion of the disk, it is
 327  * possible for transactions on far away sectors to never be serviced.
 328  * To handle these devices, we can periodically send an ordered tag to
 329  * force all outstanding transactions to be serviced prior to a new
 330  * transaction.
 331  */
 332 static uint32_t aic7xxx_periodic_otag;
 333
 334 /*
 335  * Module information and settable options.
 336  */
 337 static char *aic7xxx = NULL;
 338
 339 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 340 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
 341 MODULE_LICENSE("Dual BSD/GPL");
 342 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 343 module_param(aic7xxx, charp, 0444);
 344 MODULE_PARM_DESC(aic7xxx,
 345 "period-delimited options string:\n"
 346 "       verbose                 Enable verbose/diagnostic logging\n"
 347 "       allow_memio             Allow device registers to be memory mapped\n"
 348 "       debug                   Bitmask of debug values to enable\n"
 349 "       no_probe                Toggle EISA/VLB controller probing\n"
 350 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 351 "       no_reset                Suppress initial bus resets\n"
 352 "       extended                Enable extended geometry on all controllers\n"
 353 "       periodic_otag           Send an ordered tagged transaction\n"
 354 "                               periodically to prevent tag starvation.\n"
 355 "                               This may be required by some older disk\n"
 356 "                               drives or RAID arrays.\n"
 357 "       tag_info:<tag_str>      Set per-target tag depth\n"
 358 "       global_tag_depth:<int>  Global tag depth for every target\n"
 359 "                               on every bus\n"
 360 "       seltime:<int>           Selection Timeout\n"
 361 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 362 "\n"
 363 "       Sample modprobe configuration file:\n"
 364 "       #       Toggle EISA/VLB probing\n"
 365 "       #       Set tag depth on Controller 1/Target 1 to 10 tags\n"
 366 "       #       Shorten the selection timeout to 128ms\n"
 367 "\n"
 368 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 369 );
 370
 371 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 372                                          struct scsi_device *,
 373                                          struct scb *);
 374 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 375                                          struct scsi_cmnd *cmd);
 376 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 377 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 378 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 379 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 380 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 381                                      struct ahc_devinfo *devinfo);
 382 static void ahc_linux_device_queue_depth(struct scsi_device *);
 383 static int ahc_linux_run_command(struct ahc_softc*,
 384                                  struct ahc_linux_device *,
 385                                  struct scsi_cmnd *);
 386 static void ahc_linux_setup_tag_info_global(char *p);
 387 static int  aic7xxx_setup(char *s);
 388
 389 static int ahc_linux_unit;
 390
 391
 392 /************************** OS Utility Wrappers *******************************/
 393 void
 394 ahc_delay(long usec)
 395 {
 396         /*
 397          * udelay on Linux can have problems for
 398          * multi-millisecond waits.  Wait at most
 399          * 1024us per call.
 400          */
 401         while (usec > 0) {
 402                 udelay(usec % 1024);
 403                 usec -= 1024;
 404         }
 405 }
 406
 407 /***************************** Low Level I/O **********************************/
 408 uint8_t
 409 ahc_inb(struct ahc_softc * ahc, long port)
 410 {
 411         uint8_t x;
 412
 413         if (ahc->tag == BUS_SPACE_MEMIO) {
 414                 x = readb(ahc->bsh.maddr + port);
 415         } else {
 416                 x = inb(ahc->bsh.ioport + port);
 417         }
 418         mb();
 419         return (x);
 420 }
 421
 422 void
 423 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
 424 {
 425         if (ahc->tag == BUS_SPACE_MEMIO) {
 426                 writeb(val, ahc->bsh.maddr + port);
 427         } else {
 428                 outb(val, ahc->bsh.ioport + port);
 429         }
 430         mb();
 431 }
 432
 433 void
 434 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 435 {
 436         int i;
 437
 438         /*
 439          * There is probably a more efficient way to do this on Linux
 440          * but we don't use this for anything speed critical and this
 441          * should work.
 442          */
 443         for (i = 0; i < count; i++)
 444                 ahc_outb(ahc, port, *array++);
 445 }
 446
 447 void
 448 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 449 {
 450         int i;
 451
 452         /*
 453          * There is probably a more efficient way to do this on Linux
 454          * but we don't use this for anything speed critical and this
 455          * should work.
 456          */
 457         for (i = 0; i < count; i++)
 458                 *array++ = ahc_inb(ahc, port);
 459 }
 460
 461 /********************************* Inlines ************************************/
 462 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 463
 464 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 465                                       struct ahc_dma_seg *sg,
 466                                       dma_addr_t addr, bus_size_t len);
 467
 468 static void
 469 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 470 {
 471         struct scsi_cmnd *cmd;
 472
 473         cmd = scb->io_ctx;
 474         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 475
 476         scsi_dma_unmap(cmd);
 477 }
 478
 479 static int
 480 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 481                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 482 {
 483         int      consumed;
 484
 485         if ((scb->sg_count + 1) > AHC_NSEG)
 486                 panic("Too few segs for dma mapping.  "
 487                       "Increase AHC_NSEG\n");
 488
 489         consumed = 1;
 490         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 491         scb->platform_data->xfer_len += len;
 492
 493         if (sizeof(dma_addr_t) > 4
 494          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 495                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 496
 497         sg->len = ahc_htole32(len);
 498         return (consumed);
 499 }
 500
 501 /*
 502  * Return a string describing the driver.
 503  */
 504 static const char *
 505 ahc_linux_info(struct Scsi_Host *host)
 506 {
 507         static char buffer[512];
 508         char    ahc_info[256];
 509         char   *bp;
 510         struct ahc_softc *ahc;
 511
 512         bp = &buffer[0];
 513         ahc = *(struct ahc_softc **)host->hostdata;
 514         memset(bp, 0, sizeof(buffer));
 515         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
 516                         "        <");
 517         strcat(bp, ahc->description);
 518         strcat(bp, ">\n"
 519                         "        ");
 520         ahc_controller_info(ahc, ahc_info);
 521         strcat(bp, ahc_info);
 522         strcat(bp, "\n");
 523
 524         return (bp);
 525 }
 526
 527 /*
 528  * Queue an SCB to the controller.
 529  */
 530 static int
 531 ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 532 {
 533         struct   ahc_softc *ahc;
 534         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 535         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 536         unsigned long flags;
 537
 538         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 539
 540         ahc_lock(ahc, &flags);
 541         if (ahc->platform_data->qfrozen == 0) {
 542                 cmd->scsi_done = scsi_done;
 543                 cmd->result = CAM_REQ_INPROG << 16;
 544                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 545         }
 546         ahc_unlock(ahc, &flags);
 547
 548         return rtn;
 549 }
 550
 551 static DEF_SCSI_QCMD(ahc_linux_queue)
 552
 553 static inline struct scsi_target **
 554 ahc_linux_target_in_softc(struct scsi_target *starget)
 555 {
 556         struct  ahc_softc *ahc =
 557                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 558         unsigned int target_offset;
 559
 560         target_offset = starget->id;
 561         if (starget->channel != 0)
 562                 target_offset += 8;
 563
 564         return &ahc->platform_data->starget[target_offset];
 565 }
 566
 567 static int
 568 ahc_linux_target_alloc(struct scsi_target *starget)
 569 {
 570         struct  ahc_softc *ahc =
 571                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 572         struct seeprom_config *sc = ahc->seep_config;
 573         unsigned long flags;
 574         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 575         unsigned short scsirate;
 576         struct ahc_devinfo devinfo;
 577         struct ahc_initiator_tinfo *tinfo;
 578         struct ahc_tmode_tstate *tstate;
 579         char channel = starget->channel + 'A';
 580         unsigned int our_id = ahc->our_id;
 581         unsigned int target_offset;
 582
 583         target_offset = starget->id;
 584         if (starget->channel != 0)
 585                 target_offset += 8;
 586
 587         if (starget->channel)
 588                 our_id = ahc->our_id_b;
 589
 590         ahc_lock(ahc, &flags);
 591
 592         BUG_ON(*ahc_targp != NULL);
 593
 594         *ahc_targp = starget;
 595
 596         if (sc) {
 597                 int maxsync = AHC_SYNCRATE_DT;
 598                 int ultra = 0;
 599                 int flags = sc->device_flags[target_offset];
 600
 601                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 602                     if (flags & CFSYNCHISULTRA)
 603                         ultra = 1;
 604                 } else if (flags & CFULTRAEN)
 605                         ultra = 1;
 606                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 607                  * change it to ultra=0, CFXFER = 0 */
 608                 if(ultra && (flags & CFXFER) == 0x04) {
 609                         ultra = 0;
 610                         flags &= ~CFXFER;
 611                 }
 612
 613                 if ((ahc->features & AHC_ULTRA2) != 0) {
 614                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 615                 } else {
 616                         scsirate = (flags & CFXFER) << 4;
 617                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 618                                 AHC_SYNCRATE_FAST;
 619                 }
 620                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 621                 if (!(flags & CFSYNCH))
 622                         spi_max_offset(starget) = 0;
 623                 spi_min_period(starget) =
 624                         ahc_find_period(ahc, scsirate, maxsync);
 625
 626                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 627                                             starget->id, &tstate);
 628         }
 629         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 630                             CAM_LUN_WILDCARD, channel,
 631                             ROLE_INITIATOR);
 632         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 633                          AHC_TRANS_GOAL, /*paused*/FALSE);
 634         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 635                       AHC_TRANS_GOAL, /*paused*/FALSE);
 636         ahc_unlock(ahc, &flags);
 637
 638         return 0;
 639 }
 640
 641 static void
 642 ahc_linux_target_destroy(struct scsi_target *starget)
 643 {
 644         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 645
 646         *ahc_targp = NULL;
 647 }
 648
 649 static int
 650 ahc_linux_slave_alloc(struct scsi_device *sdev)
 651 {
 652         struct  ahc_softc *ahc =
 653                 *((struct ahc_softc **)sdev->host->hostdata);
 654         struct scsi_target *starget = sdev->sdev_target;
 655         struct ahc_linux_device *dev;
 656
 657         if (bootverbose)
 658                 printk("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 659
 660         dev = scsi_transport_device_data(sdev);
 661         memset(dev, 0, sizeof(*dev));
 662
 663         /*
 664          * We start out life using untagged
 665          * transactions of which we allow one.
 666          */
 667         dev->openings = 1;
 668
 669         /*
 670          * Set maxtags to 0.  This will be changed if we
 671          * later determine that we are dealing with
 672          * a tagged queuing capable device.
 673          */
 674         dev->maxtags = 0;
 675
 676         spi_period(starget) = 0;
 677
 678         return 0;
 679 }
 680
 681 static int
 682 ahc_linux_slave_configure(struct scsi_device *sdev)
 683 {
 684         struct  ahc_softc *ahc;
 685
 686         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 687
 688         if (bootverbose)
 689                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 690
 691         ahc_linux_device_queue_depth(sdev);
 692
 693         /* Initial Domain Validation */
 694         if (!spi_initial_dv(sdev->sdev_target))
 695                 spi_dv_device(sdev);
 696
 697         return 0;
 698 }
 699
 700 #if defined(__i386__)
 701 /*
 702  * Return the disk geometry for the given SCSI device.
 703  */
 704 static int
 705 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 706                     sector_t capacity, int geom[])
 707 {
 708         uint8_t *bh;
 709         int      heads;
 710         int      sectors;
 711         int      cylinders;
 712         int      ret;
 713         int      extended;
 714         struct   ahc_softc *ahc;
 715         u_int    channel;
 716
 717         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 718         channel = sdev_channel(sdev);
 719
 720         bh = scsi_bios_ptable(bdev);
 721         if (bh) {
 722                 ret = scsi_partsize(bh, capacity,
 723                                     &geom[2], &geom[0], &geom[1]);
 724                 kfree(bh);
 725                 if (ret != -1)
 726                         return (ret);
 727         }
 728         heads = 64;
 729         sectors = 32;
 730         cylinders = aic_sector_div(capacity, heads, sectors);
 731
 732         if (aic7xxx_extended != 0)
 733                 extended = 1;
 734         else if (channel == 0)
 735                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 736         else
 737                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 738         if (extended && cylinders >= 1024) {
 739                 heads = 255;
 740                 sectors = 63;
 741                 cylinders = aic_sector_div(capacity, heads, sectors);
 742         }
 743         geom[0] = heads;
 744         geom[1] = sectors;
 745         geom[2] = cylinders;
 746         return (0);
 747 }
 748 #endif
 749
 750 /*
 751  * Abort the current SCSI command(s).
 752  */
 753 static int
 754 ahc_linux_abort(struct scsi_cmnd *cmd)
 755 {
 756         int error;
 757
 758         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 759         if (error != 0)
 760                 printk("aic7xxx_abort returns 0x%x\n", error);
 761         return (error);
 762 }
 763
 764 /*
 765  * Attempt to send a target reset message to the device that timed out.
 766  */
 767 static int
 768 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 769 {
 770         int error;
 771
 772         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 773         if (error != 0)
 774                 printk("aic7xxx_dev_reset returns 0x%x\n", error);
 775         return (error);
 776 }
 777
 778 /*
 779  * Reset the SCSI bus.
 780  */
 781 static int
 782 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 783 {
 784         struct ahc_softc *ahc;
 785         int    found;
 786         unsigned long flags;
 787
 788         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 789
 790         ahc_lock(ahc, &flags);
 791         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 792                                   /*initiate reset*/TRUE);
 793         ahc_unlock(ahc, &flags);
 794
 795         if (bootverbose)
 796                 printk("%s: SCSI bus reset delivered. "
 797                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 798
 799         return SUCCESS;
 800 }
 801
 802 struct scsi_host_template aic7xxx_driver_template = {
 803         .module                 = THIS_MODULE,
 804         .name                   = "aic7xxx",
 805         .proc_name              = "aic7xxx",
 806         .show_info              = ahc_linux_show_info,
 807         .write_info             = ahc_proc_write_seeprom,
 808         .info                   = ahc_linux_info,
 809         .queuecommand           = ahc_linux_queue,
 810         .eh_abort_handler       = ahc_linux_abort,
 811         .eh_device_reset_handler = ahc_linux_dev_reset,
 812         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 813 #if defined(__i386__)
 814         .bios_param             = ahc_linux_biosparam,
 815 #endif
 816         .can_queue              = AHC_MAX_QUEUE,
 817         .this_id                = -1,
 818         .max_sectors            = 8192,
 819         .cmd_per_lun            = 2,
 820         .use_clustering         = ENABLE_CLUSTERING,
 821         .slave_alloc            = ahc_linux_slave_alloc,
 822         .slave_configure        = ahc_linux_slave_configure,
 823         .target_alloc           = ahc_linux_target_alloc,
 824         .target_destroy         = ahc_linux_target_destroy,
 825 };
 826
 827 /**************************** Tasklet Handler *********************************/
 828
 829 /******************************** Macros **************************************/
 830 #define BUILD_SCSIID(ahc, cmd)                                              \
 831         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 832         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 833         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 834
 835 /******************************** Bus DMA *************************************/
 836 int
 837 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 838                    bus_size_t alignment, bus_size_t boundary,
 839                    dma_addr_t lowaddr, dma_addr_t highaddr,
 840                    bus_dma_filter_t *filter, void *filterarg,
 841                    bus_size_t maxsize, int nsegments,
 842                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 843 {
 844         bus_dma_tag_t dmat;
 845
 846         dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
 847         if (dmat == NULL)
 848                 return (ENOMEM);
 849
 850         /*
 851          * Linux is very simplistic about DMA memory.  For now don't
 852          * maintain all specification information.  Once Linux supplies
 853          * better facilities for doing these operations, or the
 854          * needs of this particular driver change, we might need to do
 855          * more here.
 856          */
 857         dmat->alignment = alignment;
 858         dmat->boundary = boundary;
 859         dmat->maxsize = maxsize;
 860         *ret_tag = dmat;
 861         return (0);
 862 }
 863
 864 void
 865 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 866 {
 867         kfree(dmat);
 868 }
 869
 870 int
 871 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 872                  int flags, bus_dmamap_t *mapp)
 873 {
 874         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 875                                       dmat->maxsize, mapp);
 876         if (*vaddr == NULL)
 877                 return ENOMEM;
 878         return 0;
 879 }
 880
 881 void
 882 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 883                 void* vaddr, bus_dmamap_t map)
 884 {
 885         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 886                             vaddr, map);
 887 }
 888
 889 int
 890 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 891                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 892                 void *cb_arg, int flags)
 893 {
 894         /*
 895          * Assume for now that this will only be used during
 896          * initialization and not for per-transaction buffer mapping.
 897          */
 898         bus_dma_segment_t stack_sg;
 899
 900         stack_sg.ds_addr = map;
 901         stack_sg.ds_len = dmat->maxsize;
 902         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 903         return (0);
 904 }
 905
 906 void
 907 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 908 {
 909 }
 910
 911 int
 912 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 913 {
 914         /* Nothing to do */
 915         return (0);
 916 }
 917
 918 static void
 919 ahc_linux_setup_tag_info_global(char *p)
 920 {
 921         int tags, i, j;
 922
 923         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 924         printk("Setting Global Tags= %d\n", tags);
 925
 926         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 927                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 928                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 929                 }
 930         }
 931 }
 932
 933 static void
 934 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 935 {
 936
 937         if ((instance >= 0) && (targ >= 0)
 938          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 939          && (targ < AHC_NUM_TARGETS)) {
 940                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 941                 if (bootverbose)
 942                         printk("tag_info[%d:%d] = %d\n", instance, targ, value);
 943         }
 944 }
 945
 946 static char *
 947 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 948                        void (*callback)(u_long, int, int, int32_t),
 949                        u_long callback_arg)
 950 {
 951         char    *tok_end;
 952         char    *tok_end2;
 953         int      i;
 954         int      instance;
 955         int      targ;
 956         int      done;
 957         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 958
 959         /* All options use a ':' name/arg separator */
 960         if (*opt_arg != ':')
 961                 return (opt_arg);
 962         opt_arg++;
 963         instance = -1;
 964         targ = -1;
 965         done = FALSE;
 966         /*
 967          * Restore separator that may be in
 968          * the middle of our option argument.
 969          */
 970         tok_end = strchr(opt_arg, '\0');
 971         if (tok_end < end)
 972                 *tok_end = ',';
 973         while (!done) {
 974                 switch (*opt_arg) {
 975                 case '{':
 976                         if (instance == -1) {
 977                                 instance = 0;
 978                         } else {
 979                                 if (depth > 1) {
 980                                         if (targ == -1)
 981                                                 targ = 0;
 982                                 } else {
 983                                         printk("Malformed Option %s\n",
 984                                                opt_name);
 985                                         done = TRUE;
 986                                 }
 987                         }
 988                         opt_arg++;
 989                         break;
 990                 case '}':
 991                         if (targ != -1)
 992                                 targ = -1;
 993                         else if (instance != -1)
 994                                 instance = -1;
 995                         opt_arg++;
 996                         break;
 997                 case ',':
 998                 case '.':
 999                         if (instance == -1)
1000                                 done = TRUE;
1001                         else if (targ >= 0)
1002                                 targ++;
1003                         else if (instance >= 0)
1004                                 instance++;
1005                         opt_arg++;
1006                         break;
1007                 case '\0':
1008                         done = TRUE;
1009                         break;
1010                 default:
1011                         tok_end = end;
1012                         for (i = 0; tok_list[i]; i++) {
1013                                 tok_end2 = strchr(opt_arg, tok_list[i]);
1014                                 if ((tok_end2) && (tok_end2 < tok_end))
1015                                         tok_end = tok_end2;
1016                         }
1017                         callback(callback_arg, instance, targ,
1018                                  simple_strtol(opt_arg, NULL, 0));
1019                         opt_arg = tok_end;
1020                         break;
1021                 }
1022         }
1023         return (opt_arg);
1024 }
1025
1026 /*
1027  * Handle Linux boot parameters. This routine allows for assigning a value
1028  * to a parameter with a ':' between the parameter and the value.
1029  * ie. aic7xxx=stpwlev:1,extended
1030  */
1031 static int
1032 aic7xxx_setup(char *s)
1033 {
1034         int     i, n;
1035         char   *p;
1036         char   *end;
1037
1038         static const struct {
1039                 const char *name;
1040                 uint32_t *flag;
1041         } options[] = {
1042                 { "extended", &aic7xxx_extended },
1043                 { "no_reset", &aic7xxx_no_reset },
1044                 { "verbose", &aic7xxx_verbose },
1045                 { "allow_memio", &aic7xxx_allow_memio},
1046 #ifdef AHC_DEBUG
1047                 { "debug", &ahc_debug },
1048 #endif
1049                 { "periodic_otag", &aic7xxx_periodic_otag },
1050                 { "pci_parity", &aic7xxx_pci_parity },
1051                 { "seltime", &aic7xxx_seltime },
1052                 { "tag_info", NULL },
1053                 { "global_tag_depth", NULL },
1054                 { "dv", NULL }
1055         };
1056
1057         end = strchr(s, '\0');
1058
1059         /*
1060          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1061          * will never be 0 in this case.
1062          */
1063         n = 0;
1064
1065         while ((p = strsep(&s, ",.")) != NULL) {
1066                 if (*p == '\0')
1067                         continue;
1068                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1069
1070                         n = strlen(options[i].name);
1071                         if (strncmp(options[i].name, p, n) == 0)
1072                                 break;
1073                 }
1074                 if (i == ARRAY_SIZE(options))
1075                         continue;
1076
1077                 if (strncmp(p, "global_tag_depth", n) == 0) {
1078                         ahc_linux_setup_tag_info_global(p + n);
1079                 } else if (strncmp(p, "tag_info", n) == 0) {
1080                         s = ahc_parse_brace_option("tag_info", p + n, end,
1081                             2, ahc_linux_setup_tag_info, 0);
1082                 } else if (p[n] == ':') {
1083                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1084                 } else if (strncmp(p, "verbose", n) == 0) {
1085                         *(options[i].flag) = 1;
1086                 } else {
1087                         *(options[i].flag) ^= 0xFFFFFFFF;
1088                 }
1089         }
1090         return 1;
1091 }
1092
1093 __setup("aic7xxx=", aic7xxx_setup);
1094
1095 uint32_t aic7xxx_verbose;
1096
1097 int
1098 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1099 {
1100         char    buf[80];
1101         struct  Scsi_Host *host;
1102         char    *new_name;
1103         u_long  s;
1104         int     retval;
1105
1106         template->name = ahc->description;
1107         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1108         if (host == NULL)
1109                 return (ENOMEM);
1110
1111         *((struct ahc_softc **)host->hostdata) = ahc;
1112         ahc->platform_data->host = host;
1113         host->can_queue = AHC_MAX_QUEUE;
1114         host->cmd_per_lun = 2;
1115         /* XXX No way to communicate the ID for multiple channels */
1116         host->this_id = ahc->our_id;
1117         host->irq = ahc->platform_data->irq;
1118         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1119         host->max_lun = AHC_NUM_LUNS;
1120         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1121         host->sg_tablesize = AHC_NSEG;
1122         ahc_lock(ahc, &s);
1123         ahc_set_unit(ahc, ahc_linux_unit++);
1124         ahc_unlock(ahc, &s);
1125         sprintf(buf, "scsi%d", host->host_no);
1126         new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1127         if (new_name != NULL) {
1128                 strcpy(new_name, buf);
1129                 ahc_set_name(ahc, new_name);
1130         }
1131         host->unique_id = ahc->unit;
1132         ahc_linux_initialize_scsi_bus(ahc);
1133         ahc_intr_enable(ahc, TRUE);
1134
1135         host->transportt = ahc_linux_transport_template;
1136
1137         retval = scsi_add_host(host,
1138                         (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
1139         if (retval) {
1140                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1141                 scsi_host_put(host);
1142                 return retval;
1143         }
1144
1145         scsi_scan_host(host);
1146         return 0;
1147 }
1148
1149 /*
1150  * Place the SCSI bus into a known state by either resetting it,
1151  * or forcing transfer negotiations on the next command to any
1152  * target.
1153  */
1154 void
1155 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1156 {
1157         int i;
1158         int numtarg;
1159         unsigned long s;
1160
1161         i = 0;
1162         numtarg = 0;
1163
1164         ahc_lock(ahc, &s);
1165
1166         if (aic7xxx_no_reset != 0)
1167                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1168
1169         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1170                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1171         else
1172                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1173
1174         if ((ahc->features & AHC_TWIN) != 0) {
1175
1176                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1177                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1178                 } else {
1179                         if (numtarg == 0)
1180                                 i = 8;
1181                         numtarg += 8;
1182                 }
1183         }
1184
1185         /*
1186          * Force negotiation to async for all targets that
1187          * will not see an initial bus reset.
1188          */
1189         for (; i < numtarg; i++) {
1190                 struct ahc_devinfo devinfo;
1191                 struct ahc_initiator_tinfo *tinfo;
1192                 struct ahc_tmode_tstate *tstate;
1193                 u_int our_id;
1194                 u_int target_id;
1195                 char channel;
1196
1197                 channel = 'A';
1198                 our_id = ahc->our_id;
1199                 target_id = i;
1200                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1201                         channel = 'B';
1202                         our_id = ahc->our_id_b;
1203                         target_id = i % 8;
1204                 }
1205                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1206                                             target_id, &tstate);
1207                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1208                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1209                 ahc_update_neg_request(ahc, &devinfo, tstate,
1210                                        tinfo, AHC_NEG_ALWAYS);
1211         }
1212         ahc_unlock(ahc, &s);
1213         /* Give the bus some time to recover */
1214         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1215                 ahc_linux_freeze_simq(ahc);
1216                 msleep(AIC7XXX_RESET_DELAY);
1217                 ahc_linux_release_simq(ahc);
1218         }
1219 }
1220
1221 int
1222 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1223 {
1224
1225         ahc->platform_data =
1226             kmalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
1227         if (ahc->platform_data == NULL)
1228                 return (ENOMEM);
1229         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1230         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1231         ahc_lockinit(ahc);
1232         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1233         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1234         if (aic7xxx_pci_parity == 0)
1235                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1236
1237         return (0);
1238 }
1239
1240 void
1241 ahc_platform_free(struct ahc_softc *ahc)
1242 {
1243         struct scsi_target *starget;
1244         int i;
1245
1246         if (ahc->platform_data != NULL) {
1247                 /* destroy all of the device and target objects */
1248                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1249                         starget = ahc->platform_data->starget[i];
1250                         if (starget != NULL) {
1251                                 ahc->platform_data->starget[i] = NULL;
1252                         }
1253                 }
1254
1255                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1256                         free_irq(ahc->platform_data->irq, ahc);
1257                 if (ahc->tag == BUS_SPACE_PIO
1258                  && ahc->bsh.ioport != 0)
1259                         release_region(ahc->bsh.ioport, 256);
1260                 if (ahc->tag == BUS_SPACE_MEMIO
1261                  && ahc->bsh.maddr != NULL) {
1262                         iounmap(ahc->bsh.maddr);
1263                         release_mem_region(ahc->platform_data->mem_busaddr,
1264                                            0x1000);
1265                 }
1266
1267                 if (ahc->platform_data->host)
1268                         scsi_host_put(ahc->platform_data->host);
1269
1270                 kfree(ahc->platform_data);
1271         }
1272 }
1273
1274 void
1275 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1276 {
1277         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1278                                 SCB_GET_CHANNEL(ahc, scb),
1279                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1280                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1281 }
1282
1283 void
1284 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1285                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1286 {
1287         struct ahc_linux_device *dev;
1288         int was_queuing;
1289         int now_queuing;
1290
1291         if (sdev == NULL)
1292                 return;
1293         dev = scsi_transport_device_data(sdev);
1294
1295         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1296         switch (alg) {
1297         default:
1298         case AHC_QUEUE_NONE:
1299                 now_queuing = 0;
1300                 break;
1301         case AHC_QUEUE_BASIC:
1302                 now_queuing = AHC_DEV_Q_BASIC;
1303                 break;
1304         case AHC_QUEUE_TAGGED:
1305                 now_queuing = AHC_DEV_Q_TAGGED;
1306                 break;
1307         }
1308         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1309          && (was_queuing != now_queuing)
1310          && (dev->active != 0)) {
1311                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1312                 dev->qfrozen++;
1313         }
1314
1315         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1316         if (now_queuing) {
1317                 u_int usertags;
1318
1319                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1320                 if (!was_queuing) {
1321                         /*
1322                          * Start out aggressively and allow our
1323                          * dynamic queue depth algorithm to take
1324                          * care of the rest.
1325                          */
1326                         dev->maxtags = usertags;
1327                         dev->openings = dev->maxtags - dev->active;
1328                 }
1329                 if (dev->maxtags == 0) {
1330                         /*
1331                          * Queueing is disabled by the user.
1332                          */
1333                         dev->openings = 1;
1334                 } else if (alg == AHC_QUEUE_TAGGED) {
1335                         dev->flags |= AHC_DEV_Q_TAGGED;
1336                         if (aic7xxx_periodic_otag != 0)
1337                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1338                 } else
1339                         dev->flags |= AHC_DEV_Q_BASIC;
1340         } else {
1341                 /* We can only have one opening. */
1342                 dev->maxtags = 0;
1343                 dev->openings =  1 - dev->active;
1344         }
1345         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1346         case AHC_DEV_Q_BASIC:
1347                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1348                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1349                 break;
1350         case AHC_DEV_Q_TAGGED:
1351                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1352                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1353                 break;
1354         default:
1355                 /*
1356                  * We allow the OS to queue 2 untagged transactions to
1357                  * us at any time even though we can only execute them
1358                  * serially on the controller/device.  This should
1359                  * remove some latency.
1360                  */
1361                 scsi_deactivate_tcq(sdev, 2);
1362                 break;
1363         }
1364 }
1365
1366 int
1367 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1368                         int lun, u_int tag, role_t role, uint32_t status)
1369 {
1370         return 0;
1371 }
1372
1373 static u_int
1374 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1375 {
1376         static int warned_user;
1377         u_int tags;
1378
1379         tags = 0;
1380         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1381                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1382                         if (warned_user == 0) {
1383
1384                                 printk(KERN_WARNING
1385 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1386 "aic7xxx: for installed controllers. Using defaults\n"
1387 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1388 "aic7xxx: the aic7xxx_osm..c source file.\n");
1389                                 warned_user++;
1390                         }
1391                         tags = AHC_MAX_QUEUE;
1392                 } else {
1393                         adapter_tag_info_t *tag_info;
1394
1395                         tag_info = &aic7xxx_tag_info[ahc->unit];
1396                         tags = tag_info->tag_commands[devinfo->target_offset];
1397                         if (tags > AHC_MAX_QUEUE)
1398                                 tags = AHC_MAX_QUEUE;
1399                 }
1400         }
1401         return (tags);
1402 }
1403
1404 /*
1405  * Determines the queue depth for a given device.
1406  */
1407 static void
1408 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1409 {
1410         struct  ahc_devinfo devinfo;
1411         u_int   tags;
1412         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1413
1414         ahc_compile_devinfo(&devinfo,
1415                             sdev->sdev_target->channel == 0
1416                           ? ahc->our_id : ahc->our_id_b,
1417                             sdev->sdev_target->id, sdev->lun,
1418                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1419                             ROLE_INITIATOR);
1420         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1421         if (tags != 0 && sdev->tagged_supported != 0) {
1422
1423                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1424                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1425                                devinfo.lun, AC_TRANSFER_NEG);
1426                 ahc_print_devinfo(ahc, &devinfo);
1427                 printk("Tagged Queuing enabled.  Depth %d\n", tags);
1428         } else {
1429                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1430                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1431                                devinfo.lun, AC_TRANSFER_NEG);
1432         }
1433 }
1434
1435 static int
1436 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1437                       struct scsi_cmnd *cmd)
1438 {
1439         struct   scb *scb;
1440         struct   hardware_scb *hscb;
1441         struct   ahc_initiator_tinfo *tinfo;
1442         struct   ahc_tmode_tstate *tstate;
1443         uint16_t mask;
1444         struct scb_tailq *untagged_q = NULL;
1445         int nseg;
1446
1447         /*
1448          * Schedule us to run later.  The only reason we are not
1449          * running is because the whole controller Q is frozen.
1450          */
1451         if (ahc->platform_data->qfrozen != 0)
1452                 return SCSI_MLQUEUE_HOST_BUSY;
1453
1454         /*
1455          * We only allow one untagged transaction
1456          * per target in the initiator role unless
1457          * we are storing a full busy target *lun*
1458          * table in SCB space.
1459          */
1460         if (!blk_rq_tagged(cmd->request)
1461             && (ahc->features & AHC_SCB_BTT) == 0) {
1462                 int target_offset;
1463
1464                 target_offset = cmd->device->id + cmd->device->channel * 8;
1465                 untagged_q = &(ahc->untagged_queues[target_offset]);
1466                 if (!TAILQ_EMPTY(untagged_q))
1467                         /* if we're already executing an untagged command
1468                          * we're busy to another */
1469                         return SCSI_MLQUEUE_DEVICE_BUSY;
1470         }
1471
1472         nseg = scsi_dma_map(cmd);
1473         if (nseg < 0)
1474                 return SCSI_MLQUEUE_HOST_BUSY;
1475
1476         /*
1477          * Get an scb to use.
1478          */
1479         scb = ahc_get_scb(ahc);
1480         if (!scb) {
1481                 scsi_dma_unmap(cmd);
1482                 return SCSI_MLQUEUE_HOST_BUSY;
1483         }
1484
1485         scb->io_ctx = cmd;
1486         scb->platform_data->dev = dev;
1487         hscb = scb->hscb;
1488         cmd->host_scribble = (char *)scb;
1489
1490         /*
1491          * Fill out basics of the HSCB.
1492          */
1493         hscb->control = 0;
1494         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1495         hscb->lun = cmd->device->lun;
1496         mask = SCB_GET_TARGET_MASK(ahc, scb);
1497         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1498                                     SCB_GET_OUR_ID(scb),
1499                                     SCB_GET_TARGET(ahc, scb), &tstate);
1500         hscb->scsirate = tinfo->scsirate;
1501         hscb->scsioffset = tinfo->curr.offset;
1502         if ((tstate->ultraenb & mask) != 0)
1503                 hscb->control |= ULTRAENB;
1504
1505         if ((ahc->user_discenable & mask) != 0)
1506                 hscb->control |= DISCENB;
1507
1508         if ((tstate->auto_negotiate & mask) != 0) {
1509                 scb->flags |= SCB_AUTO_NEGOTIATE;
1510                 scb->hscb->control |= MK_MESSAGE;
1511         }
1512
1513         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1514                 int     msg_bytes;
1515                 uint8_t tag_msgs[2];
1516
1517                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1518                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1519                         hscb->control |= tag_msgs[0];
1520                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1521                                 dev->commands_since_idle_or_otag = 0;
1522                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1523                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1524                         hscb->control |= MSG_ORDERED_TASK;
1525                         dev->commands_since_idle_or_otag = 0;
1526                 } else {
1527                         hscb->control |= MSG_SIMPLE_TASK;
1528                 }
1529         }
1530
1531         hscb->cdb_len = cmd->cmd_len;
1532         if (hscb->cdb_len <= 12) {
1533                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1534         } else {
1535                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1536                 scb->flags |= SCB_CDB32_PTR;
1537         }
1538
1539         scb->platform_data->xfer_len = 0;
1540         ahc_set_residual(scb, 0);
1541         ahc_set_sense_residual(scb, 0);
1542         scb->sg_count = 0;
1543
1544         if (nseg > 0) {
1545                 struct  ahc_dma_seg *sg;
1546                 struct  scatterlist *cur_seg;
1547                 int i;
1548
1549                 /* Copy the segments into the SG list. */
1550                 sg = scb->sg_list;
1551                 /*
1552                  * The sg_count may be larger than nseg if
1553                  * a transfer crosses a 32bit page.
1554                  */
1555                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1556                         dma_addr_t addr;
1557                         bus_size_t len;
1558                         int consumed;
1559
1560                         addr = sg_dma_address(cur_seg);
1561                         len = sg_dma_len(cur_seg);
1562                         consumed = ahc_linux_map_seg(ahc, scb,
1563                                                      sg, addr, len);
1564                         sg += consumed;
1565                         scb->sg_count += consumed;
1566                 }
1567                 sg--;
1568                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1569
1570                 /*
1571                  * Reset the sg list pointer.
1572                  */
1573                 scb->hscb->sgptr =
1574                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1575
1576                 /*
1577                  * Copy the first SG into the "current"
1578                  * data pointer area.
1579                  */
1580                 scb->hscb->dataptr = scb->sg_list->addr;
1581                 scb->hscb->datacnt = scb->sg_list->len;
1582         } else {
1583                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1584                 scb->hscb->dataptr = 0;
1585                 scb->hscb->datacnt = 0;
1586                 scb->sg_count = 0;
1587         }
1588
1589         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1590         dev->openings--;
1591         dev->active++;
1592         dev->commands_issued++;
1593         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1594                 dev->commands_since_idle_or_otag++;
1595
1596         scb->flags |= SCB_ACTIVE;
1597         if (untagged_q) {
1598                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1599                 scb->flags |= SCB_UNTAGGEDQ;
1600         }
1601         ahc_queue_scb(ahc, scb);
1602         return 0;
1603 }
1604
1605 /*
1606  * SCSI controller interrupt handler.
1607  */
1608 irqreturn_t
1609 ahc_linux_isr(int irq, void *dev_id)
1610 {
1611         struct  ahc_softc *ahc;
1612         u_long  flags;
1613         int     ours;
1614
1615         ahc = (struct ahc_softc *) dev_id;
1616         ahc_lock(ahc, &flags);
1617         ours = ahc_intr(ahc);
1618         ahc_unlock(ahc, &flags);
1619         return IRQ_RETVAL(ours);
1620 }
1621
1622 void
1623 ahc_platform_flushwork(struct ahc_softc *ahc)
1624 {
1625
1626 }
1627
1628 void
1629 ahc_send_async(struct ahc_softc *ahc, char channel,
1630                u_int target, u_int lun, ac_code code)
1631 {
1632         switch (code) {
1633         case AC_TRANSFER_NEG:
1634         {
1635                 struct  scsi_target *starget;
1636                 struct  ahc_linux_target *targ;
1637                 struct  ahc_initiator_tinfo *tinfo;
1638                 struct  ahc_tmode_tstate *tstate;
1639                 int     target_offset;
1640                 unsigned int target_ppr_options;
1641
1642                 BUG_ON(target == CAM_TARGET_WILDCARD);
1643
1644                 tinfo = ahc_fetch_transinfo(ahc, channel,
1645                                                 channel == 'A' ? ahc->our_id
1646                                                                : ahc->our_id_b,
1647                                                 target, &tstate);
1648
1649                 /*
1650                  * Don't bother reporting results while
1651                  * negotiations are still pending.
1652                  */
1653                 if (tinfo->curr.period != tinfo->goal.period
1654                  || tinfo->curr.width != tinfo->goal.width
1655                  || tinfo->curr.offset != tinfo->goal.offset
1656                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1657                         if (bootverbose == 0)
1658                                 break;
1659
1660                 /*
1661                  * Don't bother reporting results that
1662                  * are identical to those last reported.
1663                  */
1664                 target_offset = target;
1665                 if (channel == 'B')
1666                         target_offset += 8;
1667                 starget = ahc->platform_data->starget[target_offset];
1668                 if (starget == NULL)
1669                         break;
1670                 targ = scsi_transport_target_data(starget);
1671
1672                 target_ppr_options =
1673                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1674                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1675                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1676
1677                 if (tinfo->curr.period == spi_period(starget)
1678                     && tinfo->curr.width == spi_width(starget)
1679                     && tinfo->curr.offset == spi_offset(starget)
1680                  && tinfo->curr.ppr_options == target_ppr_options)
1681                         if (bootverbose == 0)
1682                                 break;
1683
1684                 spi_period(starget) = tinfo->curr.period;
1685                 spi_width(starget) = tinfo->curr.width;
1686                 spi_offset(starget) = tinfo->curr.offset;
1687                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1688                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1689                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1690                 spi_display_xfer_agreement(starget);
1691                 break;
1692         }
1693         case AC_SENT_BDR:
1694         {
1695                 WARN_ON(lun != CAM_LUN_WILDCARD);
1696                 scsi_report_device_reset(ahc->platform_data->host,
1697                                          channel - 'A', target);
1698                 break;
1699         }
1700         case AC_BUS_RESET:
1701                 if (ahc->platform_data->host != NULL) {
1702                         scsi_report_bus_reset(ahc->platform_data->host,
1703                                               channel - 'A');
1704                 }
1705                 break;
1706         default:
1707                 panic("ahc_send_async: Unexpected async event");
1708         }
1709 }
1710
1711 /*
1712  * Calls the higher level scsi done function and frees the scb.
1713  */
1714 void
1715 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1716 {
1717         struct scsi_cmnd *cmd;
1718         struct     ahc_linux_device *dev;
1719
1720         LIST_REMOVE(scb, pending_links);
1721         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1722                 struct scb_tailq *untagged_q;
1723                 int target_offset;
1724
1725                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1726                 untagged_q = &(ahc->untagged_queues[target_offset]);
1727                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1728                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1729         } else if ((scb->flags & SCB_ACTIVE) == 0) {
1730                 /*
1731                  * Transactions aborted from the untagged queue may
1732                  * not have been dispatched to the controller, so
1733                  * only check the SCB_ACTIVE flag for tagged transactions.
1734                  */
1735                 printk("SCB %d done'd twice\n", scb->hscb->tag);
1736                 ahc_dump_card_state(ahc);
1737                 panic("Stopping for safety");
1738         }
1739         cmd = scb->io_ctx;
1740         dev = scb->platform_data->dev;
1741         dev->active--;
1742         dev->openings++;
1743         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1744                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1745                 dev->qfrozen--;
1746         }
1747         ahc_linux_unmap_scb(ahc, scb);
1748
1749         /*
1750          * Guard against stale sense data.
1751          * The Linux mid-layer assumes that sense
1752          * was retrieved anytime the first byte of
1753          * the sense buffer looks "sane".
1754          */
1755         cmd->sense_buffer[0] = 0;
1756         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1757                 uint32_t amount_xferred;
1758
1759                 amount_xferred =
1760                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1761                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1762 #ifdef AHC_DEBUG
1763                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1764                                 ahc_print_path(ahc, scb);
1765                                 printk("Set CAM_UNCOR_PARITY\n");
1766                         }
1767 #endif
1768                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1769 #ifdef AHC_REPORT_UNDERFLOWS
1770                 /*
1771                  * This code is disabled by default as some
1772                  * clients of the SCSI system do not properly
1773                  * initialize the underflow parameter.  This
1774                  * results in spurious termination of commands
1775                  * that complete as expected (e.g. underflow is
1776                  * allowed as command can return variable amounts
1777                  * of data.
1778                  */
1779                 } else if (amount_xferred < scb->io_ctx->underflow) {
1780                         u_int i;
1781
1782                         ahc_print_path(ahc, scb);
1783                         printk("CDB:");
1784                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1785                                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
1786                         printk("\n");
1787                         ahc_print_path(ahc, scb);
1788                         printk("Saw underflow (%ld of %ld bytes). "
1789                                "Treated as error\n",
1790                                 ahc_get_residual(scb),
1791                                 ahc_get_transfer_length(scb));
1792                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1793 #endif
1794                 } else {
1795                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1796                 }
1797         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1798                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1799         }
1800
1801         if (dev->openings == 1
1802          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1803          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1804                 dev->tag_success_count++;
1805         /*
1806          * Some devices deal with temporary internal resource
1807          * shortages by returning queue full.  When the queue
1808          * full occurrs, we throttle back.  Slowly try to get
1809          * back to our previous queue depth.
1810          */
1811         if ((dev->openings + dev->active) < dev->maxtags
1812          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1813                 dev->tag_success_count = 0;
1814                 dev->openings++;
1815         }
1816
1817         if (dev->active == 0)
1818                 dev->commands_since_idle_or_otag = 0;
1819
1820         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1821                 printk("Recovery SCB completes\n");
1822                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1823                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1824                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1825
1826                 if (ahc->platform_data->eh_done)
1827                         complete(ahc->platform_data->eh_done);
1828         }
1829
1830         ahc_free_scb(ahc, scb);
1831         ahc_linux_queue_cmd_complete(ahc, cmd);
1832 }
1833
1834 static void
1835 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1836                              struct scsi_device *sdev, struct scb *scb)
1837 {
1838         struct  ahc_devinfo devinfo;
1839         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1840
1841         ahc_compile_devinfo(&devinfo,
1842                             ahc->our_id,
1843                             sdev->sdev_target->id, sdev->lun,
1844                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1845                             ROLE_INITIATOR);
1846
1847         /*
1848          * We don't currently trust the mid-layer to
1849          * properly deal with queue full or busy.  So,
1850          * when one occurs, we tell the mid-layer to
1851          * unconditionally requeue the command to us
1852          * so that we can retry it ourselves.  We also
1853          * implement our own throttling mechanism so
1854          * we don't clobber the device with too many
1855          * commands.
1856          */
1857         switch (ahc_get_scsi_status(scb)) {
1858         default:
1859                 break;
1860         case SCSI_STATUS_CHECK_COND:
1861         case SCSI_STATUS_CMD_TERMINATED:
1862         {
1863                 struct scsi_cmnd *cmd;
1864
1865                 /*
1866                  * Copy sense information to the OS's cmd
1867                  * structure if it is available.
1868                  */
1869                 cmd = scb->io_ctx;
1870                 if (scb->flags & SCB_SENSE) {
1871                         u_int sense_size;
1872
1873                         sense_size = min(sizeof(struct scsi_sense_data)
1874                                        - ahc_get_sense_residual(scb),
1875                                          (u_long)SCSI_SENSE_BUFFERSIZE);
1876                         memcpy(cmd->sense_buffer,
1877                                ahc_get_sense_buf(ahc, scb), sense_size);
1878                         if (sense_size < SCSI_SENSE_BUFFERSIZE)
1879                                 memset(&cmd->sense_buffer[sense_size], 0,
1880                                        SCSI_SENSE_BUFFERSIZE - sense_size);
1881                         cmd->result |= (DRIVER_SENSE << 24);
1882 #ifdef AHC_DEBUG
1883                         if (ahc_debug & AHC_SHOW_SENSE) {
1884                                 int i;
1885
1886                                 printk("Copied %d bytes of sense data:",
1887                                        sense_size);
1888                                 for (i = 0; i < sense_size; i++) {
1889                                         if ((i & 0xF) == 0)
1890                                                 printk("\n");
1891                                         printk("0x%x ", cmd->sense_buffer[i]);
1892                                 }
1893                                 printk("\n");
1894                         }
1895 #endif
1896                 }
1897                 break;
1898         }
1899         case SCSI_STATUS_QUEUE_FULL:
1900         {
1901                 /*
1902                  * By the time the core driver has returned this
1903                  * command, all other commands that were queued
1904                  * to us but not the device have been returned.
1905                  * This ensures that dev->active is equal to
1906                  * the number of commands actually queued to
1907                  * the device.
1908                  */
1909                 dev->tag_success_count = 0;
1910                 if (dev->active != 0) {
1911                         /*
1912                          * Drop our opening count to the number
1913                          * of commands currently outstanding.
1914                          */
1915                         dev->openings = 0;
1916 /*
1917                         ahc_print_path(ahc, scb);
1918                         printk("Dropping tag count to %d\n", dev->active);
1919  */
1920                         if (dev->active == dev->tags_on_last_queuefull) {
1921
1922                                 dev->last_queuefull_same_count++;
1923                                 /*
1924                                  * If we repeatedly see a queue full
1925                                  * at the same queue depth, this
1926                                  * device has a fixed number of tag
1927                                  * slots.  Lock in this tag depth
1928                                  * so we stop seeing queue fulls from
1929                                  * this device.
1930                                  */
1931                                 if (dev->last_queuefull_same_count
1932                                  == AHC_LOCK_TAGS_COUNT) {
1933                                         dev->maxtags = dev->active;
1934                                         ahc_print_path(ahc, scb);
1935                                         printk("Locking max tag count at %d\n",
1936                                                dev->active);
1937                                 }
1938                         } else {
1939                                 dev->tags_on_last_queuefull = dev->active;
1940                                 dev->last_queuefull_same_count = 0;
1941                         }
1942                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1943                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1944                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1945                                      (dev->flags & AHC_DEV_Q_BASIC)
1946                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1947                         break;
1948                 }
1949                 /*
1950                  * Drop down to a single opening, and treat this
1951                  * as if the target returned BUSY SCSI status.
1952                  */
1953                 dev->openings = 1;
1954                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1955                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1956                              (dev->flags & AHC_DEV_Q_BASIC)
1957                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1958                 break;
1959         }
1960         }
1961 }
1962
1963 static void
1964 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1965 {
1966         /*
1967          * Map CAM error codes into Linux Error codes.  We
1968          * avoid the conversion so that the DV code has the
1969          * full error information available when making
1970          * state change decisions.
1971          */
1972         {
1973                 u_int new_status;
1974
1975                 switch (ahc_cmd_get_transaction_status(cmd)) {
1976                 case CAM_REQ_INPROG:
1977                 case CAM_REQ_CMP:
1978                 case CAM_SCSI_STATUS_ERROR:
1979                         new_status = DID_OK;
1980                         break;
1981                 case CAM_REQ_ABORTED:
1982                         new_status = DID_ABORT;
1983                         break;
1984                 case CAM_BUSY:
1985                         new_status = DID_BUS_BUSY;
1986                         break;
1987                 case CAM_REQ_INVALID:
1988                 case CAM_PATH_INVALID:
1989                         new_status = DID_BAD_TARGET;
1990                         break;
1991                 case CAM_SEL_TIMEOUT:
1992                         new_status = DID_NO_CONNECT;
1993                         break;
1994                 case CAM_SCSI_BUS_RESET:
1995                 case CAM_BDR_SENT:
1996                         new_status = DID_RESET;
1997                         break;
1998                 case CAM_UNCOR_PARITY:
1999                         new_status = DID_PARITY;
2000                         break;
2001                 case CAM_CMD_TIMEOUT:
2002                         new_status = DID_TIME_OUT;
2003                         break;
2004                 case CAM_UA_ABORT:
2005                 case CAM_REQ_CMP_ERR:
2006                 case CAM_AUTOSENSE_FAIL:
2007                 case CAM_NO_HBA:
2008                 case CAM_DATA_RUN_ERR:
2009                 case CAM_UNEXP_BUSFREE:
2010                 case CAM_SEQUENCE_FAIL:
2011                 case CAM_CCB_LEN_ERR:
2012                 case CAM_PROVIDE_FAIL:
2013                 case CAM_REQ_TERMIO:
2014                 case CAM_UNREC_HBA_ERROR:
2015                 case CAM_REQ_TOO_BIG:
2016                         new_status = DID_ERROR;
2017                         break;
2018                 case CAM_REQUEUE_REQ:
2019                         new_status = DID_REQUEUE;
2020                         break;
2021                 default:
2022                         /* We should never get here */
2023                         new_status = DID_ERROR;
2024                         break;
2025                 }
2026
2027                 ahc_cmd_set_transaction_status(cmd, new_status);
2028         }
2029
2030         cmd->scsi_done(cmd);
2031 }
2032
2033 static void
2034 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2035 {
2036         unsigned long s;
2037
2038         ahc_lock(ahc, &s);
2039         ahc->platform_data->qfrozen++;
2040         if (ahc->platform_data->qfrozen == 1) {
2041                 scsi_block_requests(ahc->platform_data->host);
2042
2043                 /* XXX What about Twin channels? */
2044                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2045                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2046                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2047         }
2048         ahc_unlock(ahc, &s);
2049 }
2050
2051 static void
2052 ahc_linux_release_simq(struct ahc_softc *ahc)
2053 {
2054         u_long s;
2055         int    unblock_reqs;
2056
2057         unblock_reqs = 0;
2058         ahc_lock(ahc, &s);
2059         if (ahc->platform_data->qfrozen > 0)
2060                 ahc->platform_data->qfrozen--;
2061         if (ahc->platform_data->qfrozen == 0)
2062                 unblock_reqs = 1;
2063         ahc_unlock(ahc, &s);
2064         /*
2065          * There is still a race here.  The mid-layer
2066          * should keep its own freeze count and use
2067          * a bottom half handler to run the queues
2068          * so we can unblock with our own lock held.
2069          */
2070         if (unblock_reqs)
2071                 scsi_unblock_requests(ahc->platform_data->host);
2072 }
2073
2074 static int
2075 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2076 {
2077         struct ahc_softc *ahc;
2078         struct ahc_linux_device *dev;
2079         struct scb *pending_scb;
2080         u_int  saved_scbptr;
2081         u_int  active_scb_index;
2082         u_int  last_phase;
2083         u_int  saved_scsiid;
2084         u_int  cdb_byte;
2085         int    retval;
2086         int    was_paused;
2087         int    paused;
2088         int    wait;
2089         int    disconnected;
2090         unsigned long flags;
2091
2092         pending_scb = NULL;
2093         paused = FALSE;
2094         wait = FALSE;
2095         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2096
2097         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2098                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2099
2100         printk("CDB:");
2101         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2102                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
2103         printk("\n");
2104
2105         ahc_lock(ahc, &flags);
2106
2107         /*
2108          * First determine if we currently own this command.
2109          * Start by searching the device queue.  If not found
2110          * there, check the pending_scb list.  If not found
2111          * at all, and the system wanted us to just abort the
2112          * command, return success.
2113          */
2114         dev = scsi_transport_device_data(cmd->device);
2115
2116         if (dev == NULL) {
2117                 /*
2118                  * No target device for this command exists,
2119                  * so we must not still own the command.
2120                  */
2121                 printk("%s:%d:%d:%d: Is not an active device\n",
2122                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2123                        cmd->device->lun);
2124                 retval = SUCCESS;
2125                 goto no_cmd;
2126         }
2127
2128         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2129          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2130                                        cmd->device->channel + 'A',
2131                                        cmd->device->lun,
2132                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2133                 printk("%s:%d:%d:%d: Command found on untagged queue\n",
2134                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2135                        cmd->device->lun);
2136                 retval = SUCCESS;
2137                 goto done;
2138         }
2139
2140         /*
2141          * See if we can find a matching cmd in the pending list.
2142          */
2143         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2144                 if (pending_scb->io_ctx == cmd)
2145                         break;
2146         }
2147
2148         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2149
2150                 /* Any SCB for this device will do for a target reset */
2151                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2152                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2153                                           scmd_channel(cmd) + 'A',
2154                                           CAM_LUN_WILDCARD,
2155                                           SCB_LIST_NULL, ROLE_INITIATOR))
2156                                 break;
2157                 }
2158         }
2159
2160         if (pending_scb == NULL) {
2161                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2162                 goto no_cmd;
2163         }
2164
2165         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2166                 /*
2167                  * We can't queue two recovery actions using the same SCB
2168                  */
2169                 retval = FAILED;
2170                 goto  done;
2171         }
2172
2173         /*
2174          * Ensure that the card doesn't do anything
2175          * behind our back and that we didn't "just" miss
2176          * an interrupt that would affect this cmd.
2177          */
2178         was_paused = ahc_is_paused(ahc);
2179         ahc_pause_and_flushwork(ahc);
2180         paused = TRUE;
2181
2182         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2183                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2184                 goto no_cmd;
2185         }
2186
2187         printk("%s: At time of recovery, card was %spaused\n",
2188                ahc_name(ahc), was_paused ? "" : "not ");
2189         ahc_dump_card_state(ahc);
2190
2191         disconnected = TRUE;
2192         if (flag == SCB_ABORT) {
2193                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2194                                        cmd->device->channel + 'A',
2195                                        cmd->device->lun,
2196                                        pending_scb->hscb->tag,
2197                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2198                                        SEARCH_COMPLETE) > 0) {
2199                         printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2200                                ahc_name(ahc), cmd->device->channel,
2201                                         cmd->device->id, cmd->device->lun);
2202                         retval = SUCCESS;
2203                         goto done;
2204                 }
2205         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2206                                       cmd->device->channel + 'A',
2207                                       cmd->device->lun, pending_scb->hscb->tag,
2208                                       ROLE_INITIATOR, /*status*/0,
2209                                       SEARCH_COUNT) > 0) {
2210                 disconnected = FALSE;
2211         }
2212
2213         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2214                 struct scb *bus_scb;
2215
2216                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2217                 if (bus_scb == pending_scb)
2218                         disconnected = FALSE;
2219                 else if (flag != SCB_ABORT
2220                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2221                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2222                         disconnected = FALSE;
2223         }
2224
2225         /*
2226          * At this point, pending_scb is the scb associated with the
2227          * passed in command.  That command is currently active on the
2228          * bus, is in the disconnected state, or we're hoping to find
2229          * a command for the same target active on the bus to abuse to
2230          * send a BDR.  Queue the appropriate message based on which of
2231          * these states we are in.
2232          */
2233         last_phase = ahc_inb(ahc, LASTPHASE);
2234         saved_scbptr = ahc_inb(ahc, SCBPTR);
2235         active_scb_index = ahc_inb(ahc, SCB_TAG);
2236         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2237         if (last_phase != P_BUSFREE
2238          && (pending_scb->hscb->tag == active_scb_index
2239           || (flag == SCB_DEVICE_RESET
2240            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2241
2242                 /*
2243                  * We're active on the bus, so assert ATN
2244                  * and hope that the target responds.
2245                  */
2246                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2247                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2248                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2249                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2250                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2251                 wait = TRUE;
2252         } else if (disconnected) {
2253
2254                 /*
2255                  * Actually re-queue this SCB in an attempt
2256                  * to select the device before it reconnects.
2257                  * In either case (selection or reselection),
2258                  * we will now issue the approprate message
2259                  * to the timed-out device.
2260                  *
2261                  * Set the MK_MESSAGE control bit indicating
2262                  * that we desire to send a message.  We
2263                  * also set the disconnected flag since
2264                  * in the paging case there is no guarantee
2265                  * that our SCB control byte matches the
2266                  * version on the card.  We don't want the
2267                  * sequencer to abort the command thinking
2268                  * an unsolicited reselection occurred.
2269                  */
2270                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2271                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2272
2273                 /*
2274                  * Remove any cached copy of this SCB in the
2275                  * disconnected list in preparation for the
2276                  * queuing of our abort SCB.  We use the
2277                  * same element in the SCB, SCB_NEXT, for
2278                  * both the qinfifo and the disconnected list.
2279                  */
2280                 ahc_search_disc_list(ahc, cmd->device->id,
2281                                      cmd->device->channel + 'A',
2282                                      cmd->device->lun, pending_scb->hscb->tag,
2283                                      /*stop_on_first*/TRUE,
2284                                      /*remove*/TRUE,
2285                                      /*save_state*/FALSE);
2286
2287                 /*
2288                  * In the non-paging case, the sequencer will
2289                  * never re-reference the in-core SCB.
2290                  * To make sure we are notified during
2291                  * reselection, set the MK_MESSAGE flag in
2292                  * the card's copy of the SCB.
2293                  */
2294                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2295                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2296                         ahc_outb(ahc, SCB_CONTROL,
2297                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2298                 }
2299
2300                 /*
2301                  * Clear out any entries in the QINFIFO first
2302                  * so we are the next SCB for this target
2303                  * to run.
2304                  */
2305                 ahc_search_qinfifo(ahc, cmd->device->id,
2306                                    cmd->device->channel + 'A',
2307                                    cmd->device->lun, SCB_LIST_NULL,
2308                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2309                                    SEARCH_COMPLETE);
2310                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2311                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2312                 ahc_print_path(ahc, pending_scb);
2313                 printk("Device is disconnected, re-queuing SCB\n");
2314                 wait = TRUE;
2315         } else {
2316                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2317                 retval = FAILED;
2318                 goto done;
2319         }
2320
2321 no_cmd:
2322         /*
2323          * Our assumption is that if we don't have the command, no
2324          * recovery action was required, so we return success.  Again,
2325          * the semantics of the mid-layer recovery engine are not
2326          * well defined, so this may change in time.
2327          */
2328         retval = SUCCESS;
2329 done:
2330         if (paused)
2331                 ahc_unpause(ahc);
2332         if (wait) {
2333                 DECLARE_COMPLETION_ONSTACK(done);
2334
2335                 ahc->platform_data->eh_done = &done;
2336                 ahc_unlock(ahc, &flags);
2337
2338                 printk("Recovery code sleeping\n");
2339                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2340                         ahc_lock(ahc, &flags);
2341                         ahc->platform_data->eh_done = NULL;
2342                         ahc_unlock(ahc, &flags);
2343
2344                         printk("Timer Expired\n");
2345                         retval = FAILED;
2346                 }
2347                 printk("Recovery code awake\n");
2348         } else
2349                 ahc_unlock(ahc, &flags);
2350         return (retval);
2351 }
2352
2353 void
2354 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2355 {
2356 }
2357
2358 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2359 {
2360         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2361         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2362         struct ahc_devinfo devinfo;
2363         unsigned long flags;
2364
2365         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2366                             starget->channel + 'A', ROLE_INITIATOR);
2367         ahc_lock(ahc, &flags);
2368         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2369         ahc_unlock(ahc, &flags);
2370 }
2371
2372 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2373 {
2374         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2375         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2376         struct ahc_tmode_tstate *tstate;
2377         struct ahc_initiator_tinfo *tinfo
2378                 = ahc_fetch_transinfo(ahc,
2379                                       starget->channel + 'A',
2380                                       shost->this_id, starget->id, &tstate);
2381         struct ahc_devinfo devinfo;
2382         unsigned int ppr_options = tinfo->goal.ppr_options;
2383         unsigned long flags;
2384         unsigned long offset = tinfo->goal.offset;
2385         const struct ahc_syncrate *syncrate;
2386
2387         if (offset == 0)
2388                 offset = MAX_OFFSET;
2389
2390         if (period < 9)
2391                 period = 9;     /* 12.5ns is our minimum */
2392         if (period == 9) {
2393                 if (spi_max_width(starget))
2394                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2395                 else
2396                         /* need wide for DT and need DT for 12.5 ns */
2397                         period = 10;
2398         }
2399
2400         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2401                             starget->channel + 'A', ROLE_INITIATOR);
2402
2403         /* all PPR requests apart from QAS require wide transfers */
2404         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2405                 if (spi_width(starget) == 0)
2406                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2407         }
2408
2409         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2410         ahc_lock(ahc, &flags);
2411         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2412                          ppr_options, AHC_TRANS_GOAL, FALSE);
2413         ahc_unlock(ahc, &flags);
2414 }
2415
2416 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2417 {
2418         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2419         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2420         struct ahc_tmode_tstate *tstate;
2421         struct ahc_initiator_tinfo *tinfo
2422                 = ahc_fetch_transinfo(ahc,
2423                                       starget->channel + 'A',
2424                                       shost->this_id, starget->id, &tstate);
2425         struct ahc_devinfo devinfo;
2426         unsigned int ppr_options = 0;
2427         unsigned int period = 0;
2428         unsigned long flags;
2429         const struct ahc_syncrate *syncrate = NULL;
2430
2431         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2432                             starget->channel + 'A', ROLE_INITIATOR);
2433         if (offset != 0) {
2434                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2435                 period = tinfo->goal.period;
2436                 ppr_options = tinfo->goal.ppr_options;
2437         }
2438         ahc_lock(ahc, &flags);
2439         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2440                          ppr_options, AHC_TRANS_GOAL, FALSE);
2441         ahc_unlock(ahc, &flags);
2442 }
2443
2444 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2445 {
2446         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2447         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2448         struct ahc_tmode_tstate *tstate;
2449         struct ahc_initiator_tinfo *tinfo
2450                 = ahc_fetch_transinfo(ahc,
2451                                       starget->channel + 'A',
2452                                       shost->this_id, starget->id, &tstate);
2453         struct ahc_devinfo devinfo;
2454         unsigned int ppr_options = tinfo->goal.ppr_options
2455                 & ~MSG_EXT_PPR_DT_REQ;
2456         unsigned int period = tinfo->goal.period;
2457         unsigned int width = tinfo->goal.width;
2458         unsigned long flags;
2459         const struct ahc_syncrate *syncrate;
2460
2461         if (dt && spi_max_width(starget)) {
2462                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2463                 if (!width)
2464                         ahc_linux_set_width(starget, 1);
2465         } else if (period == 9)
2466                 period = 10;    /* if resetting DT, period must be >= 25ns */
2467
2468         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2469                             starget->channel + 'A', ROLE_INITIATOR);
2470         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2471         ahc_lock(ahc, &flags);
2472         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2473                          ppr_options, AHC_TRANS_GOAL, FALSE);
2474         ahc_unlock(ahc, &flags);
2475 }
2476
2477 #if 0
2478 /* FIXME: This code claims to support IU and QAS.  However, the actual
2479  * sequencer code and aic7xxx_core have no support for these parameters and
2480  * will get into a bad state if they're negotiated.  Do not enable this
2481  * unless you know what you're doing */
2482 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2483 {
2484         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2485         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2486         struct ahc_tmode_tstate *tstate;
2487         struct ahc_initiator_tinfo *tinfo
2488                 = ahc_fetch_transinfo(ahc,
2489                                       starget->channel + 'A',
2490                                       shost->this_id, starget->id, &tstate);
2491         struct ahc_devinfo devinfo;
2492         unsigned int ppr_options = tinfo->goal.ppr_options
2493                 & ~MSG_EXT_PPR_QAS_REQ;
2494         unsigned int period = tinfo->goal.period;
2495         unsigned long flags;
2496         struct ahc_syncrate *syncrate;
2497
2498         if (qas)
2499                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2500
2501         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2502                             starget->channel + 'A', ROLE_INITIATOR);
2503         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2504         ahc_lock(ahc, &flags);
2505         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2506                          ppr_options, AHC_TRANS_GOAL, FALSE);
2507         ahc_unlock(ahc, &flags);
2508 }
2509
2510 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2511 {
2512         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2513         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2514         struct ahc_tmode_tstate *tstate;
2515         struct ahc_initiator_tinfo *tinfo
2516                 = ahc_fetch_transinfo(ahc,
2517                                       starget->channel + 'A',
2518                                       shost->this_id, starget->id, &tstate);
2519         struct ahc_devinfo devinfo;
2520         unsigned int ppr_options = tinfo->goal.ppr_options
2521                 & ~MSG_EXT_PPR_IU_REQ;
2522         unsigned int period = tinfo->goal.period;
2523         unsigned long flags;
2524         struct ahc_syncrate *syncrate;
2525
2526         if (iu)
2527                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2528
2529         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2530                             starget->channel + 'A', ROLE_INITIATOR);
2531         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2532         ahc_lock(ahc, &flags);
2533         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2534                          ppr_options, AHC_TRANS_GOAL, FALSE);
2535         ahc_unlock(ahc, &flags);
2536 }
2537 #endif
2538
2539 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2540 {
2541         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2542         unsigned long flags;
2543         u8 mode;
2544
2545         if (!(ahc->features & AHC_ULTRA2)) {
2546                 /* non-LVD chipset, may not have SBLKCTL reg */
2547                 spi_signalling(shost) =
2548                         ahc->features & AHC_HVD ?
2549                         SPI_SIGNAL_HVD :
2550                         SPI_SIGNAL_SE;
2551                 return;
2552         }
2553
2554         ahc_lock(ahc, &flags);
2555         ahc_pause(ahc);
2556         mode = ahc_inb(ahc, SBLKCTL);
2557         ahc_unpause(ahc);
2558         ahc_unlock(ahc, &flags);
2559
2560         if (mode & ENAB40)
2561                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2562         else if (mode & ENAB20)
2563                 spi_signalling(shost) = SPI_SIGNAL_SE;
2564         else
2565                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2566 }
2567
2568 static struct spi_function_template ahc_linux_transport_functions = {
2569         .set_offset     = ahc_linux_set_offset,
2570         .show_offset    = 1,
2571         .set_period     = ahc_linux_set_period,
2572         .show_period    = 1,
2573         .set_width      = ahc_linux_set_width,
2574         .show_width     = 1,
2575         .set_dt         = ahc_linux_set_dt,
2576         .show_dt        = 1,
2577 #if 0
2578         .set_iu         = ahc_linux_set_iu,
2579         .show_iu        = 1,
2580         .set_qas        = ahc_linux_set_qas,
2581         .show_qas       = 1,
2582 #endif
2583         .get_signalling = ahc_linux_get_signalling,
2584 };
2585
2586
2587
2588 static int __init
2589 ahc_linux_init(void)
2590 {
2591         /*
2592          * If we've been passed any parameters, process them now.
2593          */
2594         if (aic7xxx)
2595                 aic7xxx_setup(aic7xxx);
2596
2597         ahc_linux_transport_template =
2598                 spi_attach_transport(&ahc_linux_transport_functions);
2599         if (!ahc_linux_transport_template)
2600                 return -ENODEV;
2601
2602         scsi_transport_reserve_device(ahc_linux_transport_template,
2603                                       sizeof(struct ahc_linux_device));
2604
2605         ahc_linux_pci_init();
2606         ahc_linux_eisa_init();
2607         return 0;
2608 }
2609
2610 static void
2611 ahc_linux_exit(void)
2612 {
2613         ahc_linux_pci_exit();
2614         ahc_linux_eisa_exit();
2615         spi_release_transport(ahc_linux_transport_template);
2616 }
2617
2618 module_init(ahc_linux_init);
2619 module_exit(ahc_linux_exit);