drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132
 133
 134 /*
 135  * Set this to the delay in seconds after SCSI bus reset.
 136  * Note, we honor this only for the initial bus reset.
 137  * The scsi error recovery code performs its own bus settle
 138  * delay handling for error recovery actions.
 139  */
 140 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 141 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #else
 143 #define AIC7XXX_RESET_DELAY 5000
 144 #endif
 145
 146 /*
 147  * Control collection of SCSI transfer statistics for the /proc filesystem.
 148  *
 149  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 150  * NOTE: This does affect performance since it has to maintain statistics.
 151  */
 152 #ifdef CONFIG_AIC7XXX_PROC_STATS
 153 #define AIC7XXX_PROC_STATS
 154 #endif
 155
 156 /*
 157  * To change the default number of tagged transactions allowed per-device,
 158  * add a line to the lilo.conf file like:
 159  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 160  * which will result in the first four devices on the first two
 161  * controllers being set to a tagged queue depth of 32.
 162  *
 163  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 164  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 165  * for channel 1.
 166  */
 167 typedef struct {
 168         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 169 } adapter_tag_info_t;
 170
 171 /*
 172  * Modify this as you see fit for your system.
 173  *
 174  * 0                    tagged queuing disabled
 175  * 1 <= n <= 253        n == max tags ever dispatched.
 176  *
 177  * The driver will throttle the number of commands dispatched to a
 178  * device if it returns queue full.  For devices with a fixed maximum
 179  * queue depth, the driver will eventually determine this depth and
 180  * lock it in (a console message is printed to indicate that a lock
 181  * has occurred).  On some devices, queue full is returned for a temporary
 182  * resource shortage.  These devices will return queue full at varying
 183  * depths.  The driver will throttle back when the queue fulls occur and
 184  * attempt to slowly increase the depth over time as the device recovers
 185  * from the resource shortage.
 186  *
 187  * In this example, the first line will disable tagged queueing for all
 188  * the devices on the first probed aic7xxx adapter.
 189  *
 190  * The second line enables tagged queueing with 4 commands/LUN for IDs
 191  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 192  * driver to attempt to use up to 64 tags for ID 1.
 193  *
 194  * The third line is the same as the first line.
 195  *
 196  * The fourth line disables tagged queueing for devices 0 and 3.  It
 197  * enables tagged queueing for the other IDs, with 16 commands/LUN
 198  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 199  * IDs 2, 5-7, and 9-15.
 200  */
 201
 202 /*
 203  * NOTE: The below structure is for reference only, the actual structure
 204  *       to modify in order to change things is just below this comment block.
 205 adapter_tag_info_t aic7xxx_tag_info[] =
 206 {
 207         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 208         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 209         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 210         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 211 };
 212 */
 213
 214 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 215 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 216 #else
 217 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 218 #endif
 219
 220 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 221         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 222         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 223         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 224         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 225         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 226         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 227         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 228         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 229 }
 230
 231 /*
 232  * By default, use the number of commands specified by
 233  * the users kernel configuration.
 234  */
 235 static adapter_tag_info_t aic7xxx_tag_info[] =
 236 {
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 245         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 246         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 252         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 253 };
 254
 255 /*
 256  * There should be a specific return value for this in scsi.h, but
 257  * it seems that most drivers ignore it.
 258  */
 259 #define DID_UNDERFLOW   DID_ERROR
 260
 261 void
 262 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 263 {
 264         printk("(scsi%d:%c:%d:%d): ",
 265                ahc->platform_data->host->host_no,
 266                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 267                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 268                scb != NULL ? SCB_GET_LUN(scb) : -1);
 269 }
 270
 271 /*
 272  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 273  *       cards in the system.  This should be fixed.  Exceptions to this
 274  *       rule are noted in the comments.
 275  */
 276
 277 /*
 278  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 279  * has no effect on any later resets that might occur due to things like
 280  * SCSI bus timeouts.
 281  */
 282 static uint32_t aic7xxx_no_reset;
 283
 284 /*
 285  * Should we force EXTENDED translation on a controller.
 286  *     0 == Use whatever is in the SEEPROM or default to off
 287  *     1 == Use whatever is in the SEEPROM or default to on
 288  */
 289 static uint32_t aic7xxx_extended;
 290
 291 /*
 292  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 293  * dubious at best.  To my knowledge, this option has never actually
 294  * solved a PCI parity problem, but on certain machines with broken PCI
 295  * chipset configurations where stray PCI transactions with bad parity are
 296  * the norm rather than the exception, the error messages can be overwelming.
 297  * It's included in the driver for completeness.
 298  *   0     = Shut off PCI parity check
 299  *   non-0 = reverse polarity pci parity checking
 300  */
 301 static uint32_t aic7xxx_pci_parity = ~0;
 302
 303 /*
 304  * There are lots of broken chipsets in the world.  Some of them will
 305  * violate the PCI spec when we issue byte sized memory writes to our
 306  * controller.  I/O mapped register access, if allowed by the given
 307  * platform, will work in almost all cases.
 308  */
 309 uint32_t aic7xxx_allow_memio = ~0;
 310
 311 /*
 312  * So that we can set how long each device is given as a selection timeout.
 313  * The table of values goes like this:
 314  *   0 - 256ms
 315  *   1 - 128ms
 316  *   2 - 64ms
 317  *   3 - 32ms
 318  * We default to 256ms because some older devices need a longer time
 319  * to respond to initial selection.
 320  */
 321 static uint32_t aic7xxx_seltime;
 322
 323 /*
 324  * Certain devices do not perform any aging on commands.  Should the
 325  * device be saturated by commands in one portion of the disk, it is
 326  * possible for transactions on far away sectors to never be serviced.
 327  * To handle these devices, we can periodically send an ordered tag to
 328  * force all outstanding transactions to be serviced prior to a new
 329  * transaction.
 330  */
 331 static uint32_t aic7xxx_periodic_otag;
 332
 333 /*
 334  * Module information and settable options.
 335  */
 336 static char *aic7xxx = NULL;
 337
 338 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 339 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
 340 MODULE_LICENSE("Dual BSD/GPL");
 341 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 342 module_param(aic7xxx, charp, 0444);
 343 MODULE_PARM_DESC(aic7xxx,
 344 "period-delimited options string:\n"
 345 "       verbose                 Enable verbose/diagnostic logging\n"
 346 "       allow_memio             Allow device registers to be memory mapped\n"
 347 "       debug                   Bitmask of debug values to enable\n"
 348 "       no_probe                Toggle EISA/VLB controller probing\n"
 349 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 350 "       no_reset                Suppress initial bus resets\n"
 351 "       extended                Enable extended geometry on all controllers\n"
 352 "       periodic_otag           Send an ordered tagged transaction\n"
 353 "                               periodically to prevent tag starvation.\n"
 354 "                               This may be required by some older disk\n"
 355 "                               drives or RAID arrays.\n"
 356 "       tag_info:<tag_str>      Set per-target tag depth\n"
 357 "       global_tag_depth:<int>  Global tag depth for every target\n"
 358 "                               on every bus\n"
 359 "       seltime:<int>           Selection Timeout\n"
 360 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 361 "\n"
 362 "       Sample /etc/modprobe.conf line:\n"
 363 "               Toggle EISA/VLB probing\n"
 364 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 365 "               Shorten the selection timeout to 128ms\n"
 366 "\n"
 367 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 368 );
 369
 370 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 371                                          struct scsi_device *,
 372                                          struct scb *);
 373 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 374                                          struct scsi_cmnd *cmd);
 375 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 376 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 377 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 378 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 379 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 380                                      struct ahc_devinfo *devinfo);
 381 static void ahc_linux_device_queue_depth(struct scsi_device *);
 382 static int ahc_linux_run_command(struct ahc_softc*,
 383                                  struct ahc_linux_device *,
 384                                  struct scsi_cmnd *);
 385 static void ahc_linux_setup_tag_info_global(char *p);
 386 static int  aic7xxx_setup(char *s);
 387
 388 static int ahc_linux_unit;
 389
 390
 391 /************************** OS Utility Wrappers *******************************/
 392 void
 393 ahc_delay(long usec)
 394 {
 395         /*
 396          * udelay on Linux can have problems for
 397          * multi-millisecond waits.  Wait at most
 398          * 1024us per call.
 399          */
 400         while (usec > 0) {
 401                 udelay(usec % 1024);
 402                 usec -= 1024;
 403         }
 404 }
 405
 406 /***************************** Low Level I/O **********************************/
 407 uint8_t
 408 ahc_inb(struct ahc_softc * ahc, long port)
 409 {
 410         uint8_t x;
 411
 412         if (ahc->tag == BUS_SPACE_MEMIO) {
 413                 x = readb(ahc->bsh.maddr + port);
 414         } else {
 415                 x = inb(ahc->bsh.ioport + port);
 416         }
 417         mb();
 418         return (x);
 419 }
 420
 421 void
 422 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
 423 {
 424         if (ahc->tag == BUS_SPACE_MEMIO) {
 425                 writeb(val, ahc->bsh.maddr + port);
 426         } else {
 427                 outb(val, ahc->bsh.ioport + port);
 428         }
 429         mb();
 430 }
 431
 432 void
 433 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 434 {
 435         int i;
 436
 437         /*
 438          * There is probably a more efficient way to do this on Linux
 439          * but we don't use this for anything speed critical and this
 440          * should work.
 441          */
 442         for (i = 0; i < count; i++)
 443                 ahc_outb(ahc, port, *array++);
 444 }
 445
 446 void
 447 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 448 {
 449         int i;
 450
 451         /*
 452          * There is probably a more efficient way to do this on Linux
 453          * but we don't use this for anything speed critical and this
 454          * should work.
 455          */
 456         for (i = 0; i < count; i++)
 457                 *array++ = ahc_inb(ahc, port);
 458 }
 459
 460 /********************************* Inlines ************************************/
 461 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 462
 463 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 464                                       struct ahc_dma_seg *sg,
 465                                       dma_addr_t addr, bus_size_t len);
 466
 467 static void
 468 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 469 {
 470         struct scsi_cmnd *cmd;
 471
 472         cmd = scb->io_ctx;
 473         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 474
 475         scsi_dma_unmap(cmd);
 476 }
 477
 478 static int
 479 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 480                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 481 {
 482         int      consumed;
 483
 484         if ((scb->sg_count + 1) > AHC_NSEG)
 485                 panic("Too few segs for dma mapping.  "
 486                       "Increase AHC_NSEG\n");
 487
 488         consumed = 1;
 489         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 490         scb->platform_data->xfer_len += len;
 491
 492         if (sizeof(dma_addr_t) > 4
 493          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 494                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 495
 496         sg->len = ahc_htole32(len);
 497         return (consumed);
 498 }
 499
 500 /*
 501  * Return a string describing the driver.
 502  */
 503 static const char *
 504 ahc_linux_info(struct Scsi_Host *host)
 505 {
 506         static char buffer[512];
 507         char    ahc_info[256];
 508         char   *bp;
 509         struct ahc_softc *ahc;
 510
 511         bp = &buffer[0];
 512         ahc = *(struct ahc_softc **)host->hostdata;
 513         memset(bp, 0, sizeof(buffer));
 514         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 515         strcat(bp, AIC7XXX_DRIVER_VERSION);
 516         strcat(bp, "\n");
 517         strcat(bp, "        <");
 518         strcat(bp, ahc->description);
 519         strcat(bp, ">\n");
 520         strcat(bp, "        ");
 521         ahc_controller_info(ahc, ahc_info);
 522         strcat(bp, ahc_info);
 523         strcat(bp, "\n");
 524
 525         return (bp);
 526 }
 527
 528 /*
 529  * Queue an SCB to the controller.
 530  */
 531 static int
 532 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 533 {
 534         struct   ahc_softc *ahc;
 535         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 536         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 537         unsigned long flags;
 538
 539         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 540
 541         ahc_lock(ahc, &flags);
 542         if (ahc->platform_data->qfrozen == 0) {
 543                 cmd->scsi_done = scsi_done;
 544                 cmd->result = CAM_REQ_INPROG << 16;
 545                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 546         }
 547         ahc_unlock(ahc, &flags);
 548
 549         return rtn;
 550 }
 551
 552 static inline struct scsi_target **
 553 ahc_linux_target_in_softc(struct scsi_target *starget)
 554 {
 555         struct  ahc_softc *ahc =
 556                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 557         unsigned int target_offset;
 558
 559         target_offset = starget->id;
 560         if (starget->channel != 0)
 561                 target_offset += 8;
 562
 563         return &ahc->platform_data->starget[target_offset];
 564 }
 565
 566 static int
 567 ahc_linux_target_alloc(struct scsi_target *starget)
 568 {
 569         struct  ahc_softc *ahc =
 570                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 571         struct seeprom_config *sc = ahc->seep_config;
 572         unsigned long flags;
 573         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 574         unsigned short scsirate;
 575         struct ahc_devinfo devinfo;
 576         struct ahc_initiator_tinfo *tinfo;
 577         struct ahc_tmode_tstate *tstate;
 578         char channel = starget->channel + 'A';
 579         unsigned int our_id = ahc->our_id;
 580         unsigned int target_offset;
 581
 582         target_offset = starget->id;
 583         if (starget->channel != 0)
 584                 target_offset += 8;
 585
 586         if (starget->channel)
 587                 our_id = ahc->our_id_b;
 588
 589         ahc_lock(ahc, &flags);
 590
 591         BUG_ON(*ahc_targp != NULL);
 592
 593         *ahc_targp = starget;
 594
 595         if (sc) {
 596                 int maxsync = AHC_SYNCRATE_DT;
 597                 int ultra = 0;
 598                 int flags = sc->device_flags[target_offset];
 599
 600                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 601                     if (flags & CFSYNCHISULTRA)
 602                         ultra = 1;
 603                 } else if (flags & CFULTRAEN)
 604                         ultra = 1;
 605                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 606                  * change it to ultra=0, CFXFER = 0 */
 607                 if(ultra && (flags & CFXFER) == 0x04) {
 608                         ultra = 0;
 609                         flags &= ~CFXFER;
 610                 }
 611
 612                 if ((ahc->features & AHC_ULTRA2) != 0) {
 613                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 614                 } else {
 615                         scsirate = (flags & CFXFER) << 4;
 616                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 617                                 AHC_SYNCRATE_FAST;
 618                 }
 619                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 620                 if (!(flags & CFSYNCH))
 621                         spi_max_offset(starget) = 0;
 622                 spi_min_period(starget) =
 623                         ahc_find_period(ahc, scsirate, maxsync);
 624
 625                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 626                                             starget->id, &tstate);
 627         }
 628         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 629                             CAM_LUN_WILDCARD, channel,
 630                             ROLE_INITIATOR);
 631         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 632                          AHC_TRANS_GOAL, /*paused*/FALSE);
 633         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 634                       AHC_TRANS_GOAL, /*paused*/FALSE);
 635         ahc_unlock(ahc, &flags);
 636
 637         return 0;
 638 }
 639
 640 static void
 641 ahc_linux_target_destroy(struct scsi_target *starget)
 642 {
 643         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 644
 645         *ahc_targp = NULL;
 646 }
 647
 648 static int
 649 ahc_linux_slave_alloc(struct scsi_device *sdev)
 650 {
 651         struct  ahc_softc *ahc =
 652                 *((struct ahc_softc **)sdev->host->hostdata);
 653         struct scsi_target *starget = sdev->sdev_target;
 654         struct ahc_linux_device *dev;
 655
 656         if (bootverbose)
 657                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 658
 659         dev = scsi_transport_device_data(sdev);
 660         memset(dev, 0, sizeof(*dev));
 661
 662         /*
 663          * We start out life using untagged
 664          * transactions of which we allow one.
 665          */
 666         dev->openings = 1;
 667
 668         /*
 669          * Set maxtags to 0.  This will be changed if we
 670          * later determine that we are dealing with
 671          * a tagged queuing capable device.
 672          */
 673         dev->maxtags = 0;
 674
 675         spi_period(starget) = 0;
 676
 677         return 0;
 678 }
 679
 680 static int
 681 ahc_linux_slave_configure(struct scsi_device *sdev)
 682 {
 683         struct  ahc_softc *ahc;
 684
 685         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 686
 687         if (bootverbose)
 688                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 689
 690         ahc_linux_device_queue_depth(sdev);
 691
 692         /* Initial Domain Validation */
 693         if (!spi_initial_dv(sdev->sdev_target))
 694                 spi_dv_device(sdev);
 695
 696         return 0;
 697 }
 698
 699 #if defined(__i386__)
 700 /*
 701  * Return the disk geometry for the given SCSI device.
 702  */
 703 static int
 704 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 705                     sector_t capacity, int geom[])
 706 {
 707         uint8_t *bh;
 708         int      heads;
 709         int      sectors;
 710         int      cylinders;
 711         int      ret;
 712         int      extended;
 713         struct   ahc_softc *ahc;
 714         u_int    channel;
 715
 716         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 717         channel = sdev_channel(sdev);
 718
 719         bh = scsi_bios_ptable(bdev);
 720         if (bh) {
 721                 ret = scsi_partsize(bh, capacity,
 722                                     &geom[2], &geom[0], &geom[1]);
 723                 kfree(bh);
 724                 if (ret != -1)
 725                         return (ret);
 726         }
 727         heads = 64;
 728         sectors = 32;
 729         cylinders = aic_sector_div(capacity, heads, sectors);
 730
 731         if (aic7xxx_extended != 0)
 732                 extended = 1;
 733         else if (channel == 0)
 734                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 735         else
 736                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 737         if (extended && cylinders >= 1024) {
 738                 heads = 255;
 739                 sectors = 63;
 740                 cylinders = aic_sector_div(capacity, heads, sectors);
 741         }
 742         geom[0] = heads;
 743         geom[1] = sectors;
 744         geom[2] = cylinders;
 745         return (0);
 746 }
 747 #endif
 748
 749 /*
 750  * Abort the current SCSI command(s).
 751  */
 752 static int
 753 ahc_linux_abort(struct scsi_cmnd *cmd)
 754 {
 755         int error;
 756
 757         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 758         if (error != 0)
 759                 printf("aic7xxx_abort returns 0x%x\n", error);
 760         return (error);
 761 }
 762
 763 /*
 764  * Attempt to send a target reset message to the device that timed out.
 765  */
 766 static int
 767 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 768 {
 769         int error;
 770
 771         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 772         if (error != 0)
 773                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 774         return (error);
 775 }
 776
 777 /*
 778  * Reset the SCSI bus.
 779  */
 780 static int
 781 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 782 {
 783         struct ahc_softc *ahc;
 784         int    found;
 785         unsigned long flags;
 786
 787         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 788
 789         ahc_lock(ahc, &flags);
 790         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 791                                   /*initiate reset*/TRUE);
 792         ahc_unlock(ahc, &flags);
 793
 794         if (bootverbose)
 795                 printf("%s: SCSI bus reset delivered. "
 796                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 797
 798         return SUCCESS;
 799 }
 800
 801 struct scsi_host_template aic7xxx_driver_template = {
 802         .module                 = THIS_MODULE,
 803         .name                   = "aic7xxx",
 804         .proc_name              = "aic7xxx",
 805         .proc_info              = ahc_linux_proc_info,
 806         .info                   = ahc_linux_info,
 807         .queuecommand           = ahc_linux_queue,
 808         .eh_abort_handler       = ahc_linux_abort,
 809         .eh_device_reset_handler = ahc_linux_dev_reset,
 810         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 811 #if defined(__i386__)
 812         .bios_param             = ahc_linux_biosparam,
 813 #endif
 814         .can_queue              = AHC_MAX_QUEUE,
 815         .this_id                = -1,
 816         .max_sectors            = 8192,
 817         .cmd_per_lun            = 2,
 818         .use_clustering         = ENABLE_CLUSTERING,
 819         .slave_alloc            = ahc_linux_slave_alloc,
 820         .slave_configure        = ahc_linux_slave_configure,
 821         .target_alloc           = ahc_linux_target_alloc,
 822         .target_destroy         = ahc_linux_target_destroy,
 823 };
 824
 825 /**************************** Tasklet Handler *********************************/
 826
 827 /******************************** Macros **************************************/
 828 #define BUILD_SCSIID(ahc, cmd)                                              \
 829         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 830         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 831         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 832
 833 /******************************** Bus DMA *************************************/
 834 int
 835 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 836                    bus_size_t alignment, bus_size_t boundary,
 837                    dma_addr_t lowaddr, dma_addr_t highaddr,
 838                    bus_dma_filter_t *filter, void *filterarg,
 839                    bus_size_t maxsize, int nsegments,
 840                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 841 {
 842         bus_dma_tag_t dmat;
 843
 844         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 845         if (dmat == NULL)
 846                 return (ENOMEM);
 847
 848         /*
 849          * Linux is very simplistic about DMA memory.  For now don't
 850          * maintain all specification information.  Once Linux supplies
 851          * better facilities for doing these operations, or the
 852          * needs of this particular driver change, we might need to do
 853          * more here.
 854          */
 855         dmat->alignment = alignment;
 856         dmat->boundary = boundary;
 857         dmat->maxsize = maxsize;
 858         *ret_tag = dmat;
 859         return (0);
 860 }
 861
 862 void
 863 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 864 {
 865         free(dmat, M_DEVBUF);
 866 }
 867
 868 int
 869 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 870                  int flags, bus_dmamap_t *mapp)
 871 {
 872         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 873                                       dmat->maxsize, mapp);
 874         if (*vaddr == NULL)
 875                 return ENOMEM;
 876         return 0;
 877 }
 878
 879 void
 880 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 881                 void* vaddr, bus_dmamap_t map)
 882 {
 883         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 884                             vaddr, map);
 885 }
 886
 887 int
 888 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 889                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 890                 void *cb_arg, int flags)
 891 {
 892         /*
 893          * Assume for now that this will only be used during
 894          * initialization and not for per-transaction buffer mapping.
 895          */
 896         bus_dma_segment_t stack_sg;
 897
 898         stack_sg.ds_addr = map;
 899         stack_sg.ds_len = dmat->maxsize;
 900         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 901         return (0);
 902 }
 903
 904 void
 905 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 906 {
 907 }
 908
 909 int
 910 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 911 {
 912         /* Nothing to do */
 913         return (0);
 914 }
 915
 916 static void
 917 ahc_linux_setup_tag_info_global(char *p)
 918 {
 919         int tags, i, j;
 920
 921         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 922         printf("Setting Global Tags= %d\n", tags);
 923
 924         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 925                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 926                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 927                 }
 928         }
 929 }
 930
 931 static void
 932 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 933 {
 934
 935         if ((instance >= 0) && (targ >= 0)
 936          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 937          && (targ < AHC_NUM_TARGETS)) {
 938                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 939                 if (bootverbose)
 940                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 941         }
 942 }
 943
 944 static char *
 945 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 946                        void (*callback)(u_long, int, int, int32_t),
 947                        u_long callback_arg)
 948 {
 949         char    *tok_end;
 950         char    *tok_end2;
 951         int      i;
 952         int      instance;
 953         int      targ;
 954         int      done;
 955         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 956
 957         /* All options use a ':' name/arg separator */
 958         if (*opt_arg != ':')
 959                 return (opt_arg);
 960         opt_arg++;
 961         instance = -1;
 962         targ = -1;
 963         done = FALSE;
 964         /*
 965          * Restore separator that may be in
 966          * the middle of our option argument.
 967          */
 968         tok_end = strchr(opt_arg, '\0');
 969         if (tok_end < end)
 970                 *tok_end = ',';
 971         while (!done) {
 972                 switch (*opt_arg) {
 973                 case '{':
 974                         if (instance == -1) {
 975                                 instance = 0;
 976                         } else {
 977                                 if (depth > 1) {
 978                                         if (targ == -1)
 979                                                 targ = 0;
 980                                 } else {
 981                                         printf("Malformed Option %s\n",
 982                                                opt_name);
 983                                         done = TRUE;
 984                                 }
 985                         }
 986                         opt_arg++;
 987                         break;
 988                 case '}':
 989                         if (targ != -1)
 990                                 targ = -1;
 991                         else if (instance != -1)
 992                                 instance = -1;
 993                         opt_arg++;
 994                         break;
 995                 case ',':
 996                 case '.':
 997                         if (instance == -1)
 998                                 done = TRUE;
 999                         else if (targ >= 0)
1000                                 targ++;
1001                         else if (instance >= 0)
1002                                 instance++;
1003                         opt_arg++;
1004                         break;
1005                 case '\0':
1006                         done = TRUE;
1007                         break;
1008                 default:
1009                         tok_end = end;
1010                         for (i = 0; tok_list[i]; i++) {
1011                                 tok_end2 = strchr(opt_arg, tok_list[i]);
1012                                 if ((tok_end2) && (tok_end2 < tok_end))
1013                                         tok_end = tok_end2;
1014                         }
1015                         callback(callback_arg, instance, targ,
1016                                  simple_strtol(opt_arg, NULL, 0));
1017                         opt_arg = tok_end;
1018                         break;
1019                 }
1020         }
1021         return (opt_arg);
1022 }
1023
1024 /*
1025  * Handle Linux boot parameters. This routine allows for assigning a value
1026  * to a parameter with a ':' between the parameter and the value.
1027  * ie. aic7xxx=stpwlev:1,extended
1028  */
1029 static int
1030 aic7xxx_setup(char *s)
1031 {
1032         int     i, n;
1033         char   *p;
1034         char   *end;
1035
1036         static struct {
1037                 const char *name;
1038                 uint32_t *flag;
1039         } options[] = {
1040                 { "extended", &aic7xxx_extended },
1041                 { "no_reset", &aic7xxx_no_reset },
1042                 { "verbose", &aic7xxx_verbose },
1043                 { "allow_memio", &aic7xxx_allow_memio},
1044 #ifdef AHC_DEBUG
1045                 { "debug", &ahc_debug },
1046 #endif
1047                 { "periodic_otag", &aic7xxx_periodic_otag },
1048                 { "pci_parity", &aic7xxx_pci_parity },
1049                 { "seltime", &aic7xxx_seltime },
1050                 { "tag_info", NULL },
1051                 { "global_tag_depth", NULL },
1052                 { "dv", NULL }
1053         };
1054
1055         end = strchr(s, '\0');
1056
1057         /*
1058          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1059          * will never be 0 in this case.
1060          */
1061         n = 0;
1062
1063         while ((p = strsep(&s, ",.")) != NULL) {
1064                 if (*p == '\0')
1065                         continue;
1066                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1067
1068                         n = strlen(options[i].name);
1069                         if (strncmp(options[i].name, p, n) == 0)
1070                                 break;
1071                 }
1072                 if (i == ARRAY_SIZE(options))
1073                         continue;
1074
1075                 if (strncmp(p, "global_tag_depth", n) == 0) {
1076                         ahc_linux_setup_tag_info_global(p + n);
1077                 } else if (strncmp(p, "tag_info", n) == 0) {
1078                         s = ahc_parse_brace_option("tag_info", p + n, end,
1079                             2, ahc_linux_setup_tag_info, 0);
1080                 } else if (p[n] == ':') {
1081                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1082                 } else if (strncmp(p, "verbose", n) == 0) {
1083                         *(options[i].flag) = 1;
1084                 } else {
1085                         *(options[i].flag) ^= 0xFFFFFFFF;
1086                 }
1087         }
1088         return 1;
1089 }
1090
1091 __setup("aic7xxx=", aic7xxx_setup);
1092
1093 uint32_t aic7xxx_verbose;
1094
1095 int
1096 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1097 {
1098         char    buf[80];
1099         struct  Scsi_Host *host;
1100         char    *new_name;
1101         u_long  s;
1102         int     retval;
1103
1104         template->name = ahc->description;
1105         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1106         if (host == NULL)
1107                 return (ENOMEM);
1108
1109         *((struct ahc_softc **)host->hostdata) = ahc;
1110         ahc->platform_data->host = host;
1111         host->can_queue = AHC_MAX_QUEUE;
1112         host->cmd_per_lun = 2;
1113         /* XXX No way to communicate the ID for multiple channels */
1114         host->this_id = ahc->our_id;
1115         host->irq = ahc->platform_data->irq;
1116         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1117         host->max_lun = AHC_NUM_LUNS;
1118         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1119         host->sg_tablesize = AHC_NSEG;
1120         ahc_lock(ahc, &s);
1121         ahc_set_unit(ahc, ahc_linux_unit++);
1122         ahc_unlock(ahc, &s);
1123         sprintf(buf, "scsi%d", host->host_no);
1124         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1125         if (new_name != NULL) {
1126                 strcpy(new_name, buf);
1127                 ahc_set_name(ahc, new_name);
1128         }
1129         host->unique_id = ahc->unit;
1130         ahc_linux_initialize_scsi_bus(ahc);
1131         ahc_intr_enable(ahc, TRUE);
1132
1133         host->transportt = ahc_linux_transport_template;
1134
1135         retval = scsi_add_host(host,
1136                         (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
1137         if (retval) {
1138                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1139                 scsi_host_put(host);
1140                 return retval;
1141         }
1142
1143         scsi_scan_host(host);
1144         return 0;
1145 }
1146
1147 /*
1148  * Place the SCSI bus into a known state by either resetting it,
1149  * or forcing transfer negotiations on the next command to any
1150  * target.
1151  */
1152 void
1153 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1154 {
1155         int i;
1156         int numtarg;
1157         unsigned long s;
1158
1159         i = 0;
1160         numtarg = 0;
1161
1162         ahc_lock(ahc, &s);
1163
1164         if (aic7xxx_no_reset != 0)
1165                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1166
1167         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1168                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1169         else
1170                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1171
1172         if ((ahc->features & AHC_TWIN) != 0) {
1173
1174                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1175                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1176                 } else {
1177                         if (numtarg == 0)
1178                                 i = 8;
1179                         numtarg += 8;
1180                 }
1181         }
1182
1183         /*
1184          * Force negotiation to async for all targets that
1185          * will not see an initial bus reset.
1186          */
1187         for (; i < numtarg; i++) {
1188                 struct ahc_devinfo devinfo;
1189                 struct ahc_initiator_tinfo *tinfo;
1190                 struct ahc_tmode_tstate *tstate;
1191                 u_int our_id;
1192                 u_int target_id;
1193                 char channel;
1194
1195                 channel = 'A';
1196                 our_id = ahc->our_id;
1197                 target_id = i;
1198                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1199                         channel = 'B';
1200                         our_id = ahc->our_id_b;
1201                         target_id = i % 8;
1202                 }
1203                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1204                                             target_id, &tstate);
1205                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1206                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1207                 ahc_update_neg_request(ahc, &devinfo, tstate,
1208                                        tinfo, AHC_NEG_ALWAYS);
1209         }
1210         ahc_unlock(ahc, &s);
1211         /* Give the bus some time to recover */
1212         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1213                 ahc_linux_freeze_simq(ahc);
1214                 msleep(AIC7XXX_RESET_DELAY);
1215                 ahc_linux_release_simq(ahc);
1216         }
1217 }
1218
1219 int
1220 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1221 {
1222
1223         ahc->platform_data =
1224             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1225         if (ahc->platform_data == NULL)
1226                 return (ENOMEM);
1227         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1228         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1229         ahc_lockinit(ahc);
1230         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1231         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1232         if (aic7xxx_pci_parity == 0)
1233                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1234
1235         return (0);
1236 }
1237
1238 void
1239 ahc_platform_free(struct ahc_softc *ahc)
1240 {
1241         struct scsi_target *starget;
1242         int i;
1243
1244         if (ahc->platform_data != NULL) {
1245                 /* destroy all of the device and target objects */
1246                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1247                         starget = ahc->platform_data->starget[i];
1248                         if (starget != NULL) {
1249                                 ahc->platform_data->starget[i] = NULL;
1250                         }
1251                 }
1252
1253                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1254                         free_irq(ahc->platform_data->irq, ahc);
1255                 if (ahc->tag == BUS_SPACE_PIO
1256                  && ahc->bsh.ioport != 0)
1257                         release_region(ahc->bsh.ioport, 256);
1258                 if (ahc->tag == BUS_SPACE_MEMIO
1259                  && ahc->bsh.maddr != NULL) {
1260                         iounmap(ahc->bsh.maddr);
1261                         release_mem_region(ahc->platform_data->mem_busaddr,
1262                                            0x1000);
1263                 }
1264
1265                 if (ahc->platform_data->host)
1266                         scsi_host_put(ahc->platform_data->host);
1267
1268                 free(ahc->platform_data, M_DEVBUF);
1269         }
1270 }
1271
1272 void
1273 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1274 {
1275         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1276                                 SCB_GET_CHANNEL(ahc, scb),
1277                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1278                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1279 }
1280
1281 void
1282 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1283                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1284 {
1285         struct ahc_linux_device *dev;
1286         int was_queuing;
1287         int now_queuing;
1288
1289         if (sdev == NULL)
1290                 return;
1291         dev = scsi_transport_device_data(sdev);
1292
1293         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1294         switch (alg) {
1295         default:
1296         case AHC_QUEUE_NONE:
1297                 now_queuing = 0;
1298                 break;
1299         case AHC_QUEUE_BASIC:
1300                 now_queuing = AHC_DEV_Q_BASIC;
1301                 break;
1302         case AHC_QUEUE_TAGGED:
1303                 now_queuing = AHC_DEV_Q_TAGGED;
1304                 break;
1305         }
1306         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1307          && (was_queuing != now_queuing)
1308          && (dev->active != 0)) {
1309                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1310                 dev->qfrozen++;
1311         }
1312
1313         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1314         if (now_queuing) {
1315                 u_int usertags;
1316
1317                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1318                 if (!was_queuing) {
1319                         /*
1320                          * Start out agressively and allow our
1321                          * dynamic queue depth algorithm to take
1322                          * care of the rest.
1323                          */
1324                         dev->maxtags = usertags;
1325                         dev->openings = dev->maxtags - dev->active;
1326                 }
1327                 if (dev->maxtags == 0) {
1328                         /*
1329                          * Queueing is disabled by the user.
1330                          */
1331                         dev->openings = 1;
1332                 } else if (alg == AHC_QUEUE_TAGGED) {
1333                         dev->flags |= AHC_DEV_Q_TAGGED;
1334                         if (aic7xxx_periodic_otag != 0)
1335                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1336                 } else
1337                         dev->flags |= AHC_DEV_Q_BASIC;
1338         } else {
1339                 /* We can only have one opening. */
1340                 dev->maxtags = 0;
1341                 dev->openings =  1 - dev->active;
1342         }
1343         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1344         case AHC_DEV_Q_BASIC:
1345                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1346                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1347                 break;
1348         case AHC_DEV_Q_TAGGED:
1349                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1350                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1351                 break;
1352         default:
1353                 /*
1354                  * We allow the OS to queue 2 untagged transactions to
1355                  * us at any time even though we can only execute them
1356                  * serially on the controller/device.  This should
1357                  * remove some latency.
1358                  */
1359                 scsi_deactivate_tcq(sdev, 2);
1360                 break;
1361         }
1362 }
1363
1364 int
1365 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1366                         int lun, u_int tag, role_t role, uint32_t status)
1367 {
1368         return 0;
1369 }
1370
1371 static u_int
1372 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1373 {
1374         static int warned_user;
1375         u_int tags;
1376
1377         tags = 0;
1378         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1379                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1380                         if (warned_user == 0) {
1381
1382                                 printf(KERN_WARNING
1383 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1384 "aic7xxx: for installed controllers. Using defaults\n"
1385 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1386 "aic7xxx: the aic7xxx_osm..c source file.\n");
1387                                 warned_user++;
1388                         }
1389                         tags = AHC_MAX_QUEUE;
1390                 } else {
1391                         adapter_tag_info_t *tag_info;
1392
1393                         tag_info = &aic7xxx_tag_info[ahc->unit];
1394                         tags = tag_info->tag_commands[devinfo->target_offset];
1395                         if (tags > AHC_MAX_QUEUE)
1396                                 tags = AHC_MAX_QUEUE;
1397                 }
1398         }
1399         return (tags);
1400 }
1401
1402 /*
1403  * Determines the queue depth for a given device.
1404  */
1405 static void
1406 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1407 {
1408         struct  ahc_devinfo devinfo;
1409         u_int   tags;
1410         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1411
1412         ahc_compile_devinfo(&devinfo,
1413                             sdev->sdev_target->channel == 0
1414                           ? ahc->our_id : ahc->our_id_b,
1415                             sdev->sdev_target->id, sdev->lun,
1416                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1417                             ROLE_INITIATOR);
1418         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1419         if (tags != 0 && sdev->tagged_supported != 0) {
1420
1421                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1422                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1423                                devinfo.lun, AC_TRANSFER_NEG);
1424                 ahc_print_devinfo(ahc, &devinfo);
1425                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1426         } else {
1427                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1428                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1429                                devinfo.lun, AC_TRANSFER_NEG);
1430         }
1431 }
1432
1433 static int
1434 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1435                       struct scsi_cmnd *cmd)
1436 {
1437         struct   scb *scb;
1438         struct   hardware_scb *hscb;
1439         struct   ahc_initiator_tinfo *tinfo;
1440         struct   ahc_tmode_tstate *tstate;
1441         uint16_t mask;
1442         struct scb_tailq *untagged_q = NULL;
1443         int nseg;
1444
1445         /*
1446          * Schedule us to run later.  The only reason we are not
1447          * running is because the whole controller Q is frozen.
1448          */
1449         if (ahc->platform_data->qfrozen != 0)
1450                 return SCSI_MLQUEUE_HOST_BUSY;
1451
1452         /*
1453          * We only allow one untagged transaction
1454          * per target in the initiator role unless
1455          * we are storing a full busy target *lun*
1456          * table in SCB space.
1457          */
1458         if (!blk_rq_tagged(cmd->request)
1459             && (ahc->features & AHC_SCB_BTT) == 0) {
1460                 int target_offset;
1461
1462                 target_offset = cmd->device->id + cmd->device->channel * 8;
1463                 untagged_q = &(ahc->untagged_queues[target_offset]);
1464                 if (!TAILQ_EMPTY(untagged_q))
1465                         /* if we're already executing an untagged command
1466                          * we're busy to another */
1467                         return SCSI_MLQUEUE_DEVICE_BUSY;
1468         }
1469
1470         nseg = scsi_dma_map(cmd);
1471         if (nseg < 0)
1472                 return SCSI_MLQUEUE_HOST_BUSY;
1473
1474         /*
1475          * Get an scb to use.
1476          */
1477         scb = ahc_get_scb(ahc);
1478         if (!scb) {
1479                 scsi_dma_unmap(cmd);
1480                 return SCSI_MLQUEUE_HOST_BUSY;
1481         }
1482
1483         scb->io_ctx = cmd;
1484         scb->platform_data->dev = dev;
1485         hscb = scb->hscb;
1486         cmd->host_scribble = (char *)scb;
1487
1488         /*
1489          * Fill out basics of the HSCB.
1490          */
1491         hscb->control = 0;
1492         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1493         hscb->lun = cmd->device->lun;
1494         mask = SCB_GET_TARGET_MASK(ahc, scb);
1495         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1496                                     SCB_GET_OUR_ID(scb),
1497                                     SCB_GET_TARGET(ahc, scb), &tstate);
1498         hscb->scsirate = tinfo->scsirate;
1499         hscb->scsioffset = tinfo->curr.offset;
1500         if ((tstate->ultraenb & mask) != 0)
1501                 hscb->control |= ULTRAENB;
1502
1503         if ((ahc->user_discenable & mask) != 0)
1504                 hscb->control |= DISCENB;
1505
1506         if ((tstate->auto_negotiate & mask) != 0) {
1507                 scb->flags |= SCB_AUTO_NEGOTIATE;
1508                 scb->hscb->control |= MK_MESSAGE;
1509         }
1510
1511         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1512                 int     msg_bytes;
1513                 uint8_t tag_msgs[2];
1514
1515                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1516                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1517                         hscb->control |= tag_msgs[0];
1518                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1519                                 dev->commands_since_idle_or_otag = 0;
1520                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1521                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1522                         hscb->control |= MSG_ORDERED_TASK;
1523                         dev->commands_since_idle_or_otag = 0;
1524                 } else {
1525                         hscb->control |= MSG_SIMPLE_TASK;
1526                 }
1527         }
1528
1529         hscb->cdb_len = cmd->cmd_len;
1530         if (hscb->cdb_len <= 12) {
1531                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1532         } else {
1533                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1534                 scb->flags |= SCB_CDB32_PTR;
1535         }
1536
1537         scb->platform_data->xfer_len = 0;
1538         ahc_set_residual(scb, 0);
1539         ahc_set_sense_residual(scb, 0);
1540         scb->sg_count = 0;
1541
1542         if (nseg > 0) {
1543                 struct  ahc_dma_seg *sg;
1544                 struct  scatterlist *cur_seg;
1545                 int i;
1546
1547                 /* Copy the segments into the SG list. */
1548                 sg = scb->sg_list;
1549                 /*
1550                  * The sg_count may be larger than nseg if
1551                  * a transfer crosses a 32bit page.
1552                  */
1553                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1554                         dma_addr_t addr;
1555                         bus_size_t len;
1556                         int consumed;
1557
1558                         addr = sg_dma_address(cur_seg);
1559                         len = sg_dma_len(cur_seg);
1560                         consumed = ahc_linux_map_seg(ahc, scb,
1561                                                      sg, addr, len);
1562                         sg += consumed;
1563                         scb->sg_count += consumed;
1564                 }
1565                 sg--;
1566                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1567
1568                 /*
1569                  * Reset the sg list pointer.
1570                  */
1571                 scb->hscb->sgptr =
1572                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1573
1574                 /*
1575                  * Copy the first SG into the "current"
1576                  * data pointer area.
1577                  */
1578                 scb->hscb->dataptr = scb->sg_list->addr;
1579                 scb->hscb->datacnt = scb->sg_list->len;
1580         } else {
1581                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1582                 scb->hscb->dataptr = 0;
1583                 scb->hscb->datacnt = 0;
1584                 scb->sg_count = 0;
1585         }
1586
1587         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1588         dev->openings--;
1589         dev->active++;
1590         dev->commands_issued++;
1591         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1592                 dev->commands_since_idle_or_otag++;
1593
1594         scb->flags |= SCB_ACTIVE;
1595         if (untagged_q) {
1596                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1597                 scb->flags |= SCB_UNTAGGEDQ;
1598         }
1599         ahc_queue_scb(ahc, scb);
1600         return 0;
1601 }
1602
1603 /*
1604  * SCSI controller interrupt handler.
1605  */
1606 irqreturn_t
1607 ahc_linux_isr(int irq, void *dev_id)
1608 {
1609         struct  ahc_softc *ahc;
1610         u_long  flags;
1611         int     ours;
1612
1613         ahc = (struct ahc_softc *) dev_id;
1614         ahc_lock(ahc, &flags);
1615         ours = ahc_intr(ahc);
1616         ahc_unlock(ahc, &flags);
1617         return IRQ_RETVAL(ours);
1618 }
1619
1620 void
1621 ahc_platform_flushwork(struct ahc_softc *ahc)
1622 {
1623
1624 }
1625
1626 void
1627 ahc_send_async(struct ahc_softc *ahc, char channel,
1628                u_int target, u_int lun, ac_code code)
1629 {
1630         switch (code) {
1631         case AC_TRANSFER_NEG:
1632         {
1633                 char    buf[80];
1634                 struct  scsi_target *starget;
1635                 struct  ahc_linux_target *targ;
1636                 struct  info_str info;
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                 info.buffer = buf;
1645                 info.length = sizeof(buf);
1646                 info.offset = 0;
1647                 info.pos = 0;
1648                 tinfo = ahc_fetch_transinfo(ahc, channel,
1649                                                 channel == 'A' ? ahc->our_id
1650                                                                : ahc->our_id_b,
1651                                                 target, &tstate);
1652
1653                 /*
1654                  * Don't bother reporting results while
1655                  * negotiations are still pending.
1656                  */
1657                 if (tinfo->curr.period != tinfo->goal.period
1658                  || tinfo->curr.width != tinfo->goal.width
1659                  || tinfo->curr.offset != tinfo->goal.offset
1660                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1661                         if (bootverbose == 0)
1662                                 break;
1663
1664                 /*
1665                  * Don't bother reporting results that
1666                  * are identical to those last reported.
1667                  */
1668                 target_offset = target;
1669                 if (channel == 'B')
1670                         target_offset += 8;
1671                 starget = ahc->platform_data->starget[target_offset];
1672                 if (starget == NULL)
1673                         break;
1674                 targ = scsi_transport_target_data(starget);
1675
1676                 target_ppr_options =
1677                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1678                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1679                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1680
1681                 if (tinfo->curr.period == spi_period(starget)
1682                     && tinfo->curr.width == spi_width(starget)
1683                     && tinfo->curr.offset == spi_offset(starget)
1684                  && tinfo->curr.ppr_options == target_ppr_options)
1685                         if (bootverbose == 0)
1686                                 break;
1687
1688                 spi_period(starget) = tinfo->curr.period;
1689                 spi_width(starget) = tinfo->curr.width;
1690                 spi_offset(starget) = tinfo->curr.offset;
1691                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1692                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1693                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1694                 spi_display_xfer_agreement(starget);
1695                 break;
1696         }
1697         case AC_SENT_BDR:
1698         {
1699                 WARN_ON(lun != CAM_LUN_WILDCARD);
1700                 scsi_report_device_reset(ahc->platform_data->host,
1701                                          channel - 'A', target);
1702                 break;
1703         }
1704         case AC_BUS_RESET:
1705                 if (ahc->platform_data->host != NULL) {
1706                         scsi_report_bus_reset(ahc->platform_data->host,
1707                                               channel - 'A');
1708                 }
1709                 break;
1710         default:
1711                 panic("ahc_send_async: Unexpected async event");
1712         }
1713 }
1714
1715 /*
1716  * Calls the higher level scsi done function and frees the scb.
1717  */
1718 void
1719 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1720 {
1721         struct scsi_cmnd *cmd;
1722         struct     ahc_linux_device *dev;
1723
1724         LIST_REMOVE(scb, pending_links);
1725         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1726                 struct scb_tailq *untagged_q;
1727                 int target_offset;
1728
1729                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1730                 untagged_q = &(ahc->untagged_queues[target_offset]);
1731                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1732                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1733         } else if ((scb->flags & SCB_ACTIVE) == 0) {
1734                 /*
1735                  * Transactions aborted from the untagged queue may
1736                  * not have been dispatched to the controller, so
1737                  * only check the SCB_ACTIVE flag for tagged transactions.
1738                  */
1739                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1740                 ahc_dump_card_state(ahc);
1741                 panic("Stopping for safety");
1742         }
1743         cmd = scb->io_ctx;
1744         dev = scb->platform_data->dev;
1745         dev->active--;
1746         dev->openings++;
1747         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1748                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1749                 dev->qfrozen--;
1750         }
1751         ahc_linux_unmap_scb(ahc, scb);
1752
1753         /*
1754          * Guard against stale sense data.
1755          * The Linux mid-layer assumes that sense
1756          * was retrieved anytime the first byte of
1757          * the sense buffer looks "sane".
1758          */
1759         cmd->sense_buffer[0] = 0;
1760         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1761                 uint32_t amount_xferred;
1762
1763                 amount_xferred =
1764                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1765                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1766 #ifdef AHC_DEBUG
1767                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1768                                 ahc_print_path(ahc, scb);
1769                                 printf("Set CAM_UNCOR_PARITY\n");
1770                         }
1771 #endif
1772                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1773 #ifdef AHC_REPORT_UNDERFLOWS
1774                 /*
1775                  * This code is disabled by default as some
1776                  * clients of the SCSI system do not properly
1777                  * initialize the underflow parameter.  This
1778                  * results in spurious termination of commands
1779                  * that complete as expected (e.g. underflow is
1780                  * allowed as command can return variable amounts
1781                  * of data.
1782                  */
1783                 } else if (amount_xferred < scb->io_ctx->underflow) {
1784                         u_int i;
1785
1786                         ahc_print_path(ahc, scb);
1787                         printf("CDB:");
1788                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1789                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1790                         printf("\n");
1791                         ahc_print_path(ahc, scb);
1792                         printf("Saw underflow (%ld of %ld bytes). "
1793                                "Treated as error\n",
1794                                 ahc_get_residual(scb),
1795                                 ahc_get_transfer_length(scb));
1796                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1797 #endif
1798                 } else {
1799                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1800                 }
1801         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1802                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1803         }
1804
1805         if (dev->openings == 1
1806          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1807          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1808                 dev->tag_success_count++;
1809         /*
1810          * Some devices deal with temporary internal resource
1811          * shortages by returning queue full.  When the queue
1812          * full occurrs, we throttle back.  Slowly try to get
1813          * back to our previous queue depth.
1814          */
1815         if ((dev->openings + dev->active) < dev->maxtags
1816          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1817                 dev->tag_success_count = 0;
1818                 dev->openings++;
1819         }
1820
1821         if (dev->active == 0)
1822                 dev->commands_since_idle_or_otag = 0;
1823
1824         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1825                 printf("Recovery SCB completes\n");
1826                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1827                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1828                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1829
1830                 if (ahc->platform_data->eh_done)
1831                         complete(ahc->platform_data->eh_done);
1832         }
1833
1834         ahc_free_scb(ahc, scb);
1835         ahc_linux_queue_cmd_complete(ahc, cmd);
1836 }
1837
1838 static void
1839 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1840                              struct scsi_device *sdev, struct scb *scb)
1841 {
1842         struct  ahc_devinfo devinfo;
1843         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1844
1845         ahc_compile_devinfo(&devinfo,
1846                             ahc->our_id,
1847                             sdev->sdev_target->id, sdev->lun,
1848                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1849                             ROLE_INITIATOR);
1850
1851         /*
1852          * We don't currently trust the mid-layer to
1853          * properly deal with queue full or busy.  So,
1854          * when one occurs, we tell the mid-layer to
1855          * unconditionally requeue the command to us
1856          * so that we can retry it ourselves.  We also
1857          * implement our own throttling mechanism so
1858          * we don't clobber the device with too many
1859          * commands.
1860          */
1861         switch (ahc_get_scsi_status(scb)) {
1862         default:
1863                 break;
1864         case SCSI_STATUS_CHECK_COND:
1865         case SCSI_STATUS_CMD_TERMINATED:
1866         {
1867                 struct scsi_cmnd *cmd;
1868
1869                 /*
1870                  * Copy sense information to the OS's cmd
1871                  * structure if it is available.
1872                  */
1873                 cmd = scb->io_ctx;
1874                 if (scb->flags & SCB_SENSE) {
1875                         u_int sense_size;
1876
1877                         sense_size = min(sizeof(struct scsi_sense_data)
1878                                        - ahc_get_sense_residual(scb),
1879                                          (u_long)SCSI_SENSE_BUFFERSIZE);
1880                         memcpy(cmd->sense_buffer,
1881                                ahc_get_sense_buf(ahc, scb), sense_size);
1882                         if (sense_size < SCSI_SENSE_BUFFERSIZE)
1883                                 memset(&cmd->sense_buffer[sense_size], 0,
1884                                        SCSI_SENSE_BUFFERSIZE - sense_size);
1885                         cmd->result |= (DRIVER_SENSE << 24);
1886 #ifdef AHC_DEBUG
1887                         if (ahc_debug & AHC_SHOW_SENSE) {
1888                                 int i;
1889
1890                                 printf("Copied %d bytes of sense data:",
1891                                        sense_size);
1892                                 for (i = 0; i < sense_size; i++) {
1893                                         if ((i & 0xF) == 0)
1894                                                 printf("\n");
1895                                         printf("0x%x ", cmd->sense_buffer[i]);
1896                                 }
1897                                 printf("\n");
1898                         }
1899 #endif
1900                 }
1901                 break;
1902         }
1903         case SCSI_STATUS_QUEUE_FULL:
1904         {
1905                 /*
1906                  * By the time the core driver has returned this
1907                  * command, all other commands that were queued
1908                  * to us but not the device have been returned.
1909                  * This ensures that dev->active is equal to
1910                  * the number of commands actually queued to
1911                  * the device.
1912                  */
1913                 dev->tag_success_count = 0;
1914                 if (dev->active != 0) {
1915                         /*
1916                          * Drop our opening count to the number
1917                          * of commands currently outstanding.
1918                          */
1919                         dev->openings = 0;
1920 /*
1921                         ahc_print_path(ahc, scb);
1922                         printf("Dropping tag count to %d\n", dev->active);
1923  */
1924                         if (dev->active == dev->tags_on_last_queuefull) {
1925
1926                                 dev->last_queuefull_same_count++;
1927                                 /*
1928                                  * If we repeatedly see a queue full
1929                                  * at the same queue depth, this
1930                                  * device has a fixed number of tag
1931                                  * slots.  Lock in this tag depth
1932                                  * so we stop seeing queue fulls from
1933                                  * this device.
1934                                  */
1935                                 if (dev->last_queuefull_same_count
1936                                  == AHC_LOCK_TAGS_COUNT) {
1937                                         dev->maxtags = dev->active;
1938                                         ahc_print_path(ahc, scb);
1939                                         printf("Locking max tag count at %d\n",
1940                                                dev->active);
1941                                 }
1942                         } else {
1943                                 dev->tags_on_last_queuefull = dev->active;
1944                                 dev->last_queuefull_same_count = 0;
1945                         }
1946                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1947                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1948                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1949                                      (dev->flags & AHC_DEV_Q_BASIC)
1950                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1951                         break;
1952                 }
1953                 /*
1954                  * Drop down to a single opening, and treat this
1955                  * as if the target returned BUSY SCSI status.
1956                  */
1957                 dev->openings = 1;
1958                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1959                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1960                              (dev->flags & AHC_DEV_Q_BASIC)
1961                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1962                 break;
1963         }
1964         }
1965 }
1966
1967 static void
1968 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1969 {
1970         /*
1971          * Map CAM error codes into Linux Error codes.  We
1972          * avoid the conversion so that the DV code has the
1973          * full error information available when making
1974          * state change decisions.
1975          */
1976         {
1977                 u_int new_status;
1978
1979                 switch (ahc_cmd_get_transaction_status(cmd)) {
1980                 case CAM_REQ_INPROG:
1981                 case CAM_REQ_CMP:
1982                 case CAM_SCSI_STATUS_ERROR:
1983                         new_status = DID_OK;
1984                         break;
1985                 case CAM_REQ_ABORTED:
1986                         new_status = DID_ABORT;
1987                         break;
1988                 case CAM_BUSY:
1989                         new_status = DID_BUS_BUSY;
1990                         break;
1991                 case CAM_REQ_INVALID:
1992                 case CAM_PATH_INVALID:
1993                         new_status = DID_BAD_TARGET;
1994                         break;
1995                 case CAM_SEL_TIMEOUT:
1996                         new_status = DID_NO_CONNECT;
1997                         break;
1998                 case CAM_SCSI_BUS_RESET:
1999                 case CAM_BDR_SENT:
2000                         new_status = DID_RESET;
2001                         break;
2002                 case CAM_UNCOR_PARITY:
2003                         new_status = DID_PARITY;
2004                         break;
2005                 case CAM_CMD_TIMEOUT:
2006                         new_status = DID_TIME_OUT;
2007                         break;
2008                 case CAM_UA_ABORT:
2009                 case CAM_REQ_CMP_ERR:
2010                 case CAM_AUTOSENSE_FAIL:
2011                 case CAM_NO_HBA:
2012                 case CAM_DATA_RUN_ERR:
2013                 case CAM_UNEXP_BUSFREE:
2014                 case CAM_SEQUENCE_FAIL:
2015                 case CAM_CCB_LEN_ERR:
2016                 case CAM_PROVIDE_FAIL:
2017                 case CAM_REQ_TERMIO:
2018                 case CAM_UNREC_HBA_ERROR:
2019                 case CAM_REQ_TOO_BIG:
2020                         new_status = DID_ERROR;
2021                         break;
2022                 case CAM_REQUEUE_REQ:
2023                         new_status = DID_REQUEUE;
2024                         break;
2025                 default:
2026                         /* We should never get here */
2027                         new_status = DID_ERROR;
2028                         break;
2029                 }
2030
2031                 ahc_cmd_set_transaction_status(cmd, new_status);
2032         }
2033
2034         cmd->scsi_done(cmd);
2035 }
2036
2037 static void
2038 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2039 {
2040         unsigned long s;
2041
2042         ahc_lock(ahc, &s);
2043         ahc->platform_data->qfrozen++;
2044         if (ahc->platform_data->qfrozen == 1) {
2045                 scsi_block_requests(ahc->platform_data->host);
2046
2047                 /* XXX What about Twin channels? */
2048                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2049                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2050                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2051         }
2052         ahc_unlock(ahc, &s);
2053 }
2054
2055 static void
2056 ahc_linux_release_simq(struct ahc_softc *ahc)
2057 {
2058         u_long s;
2059         int    unblock_reqs;
2060
2061         unblock_reqs = 0;
2062         ahc_lock(ahc, &s);
2063         if (ahc->platform_data->qfrozen > 0)
2064                 ahc->platform_data->qfrozen--;
2065         if (ahc->platform_data->qfrozen == 0)
2066                 unblock_reqs = 1;
2067         ahc_unlock(ahc, &s);
2068         /*
2069          * There is still a race here.  The mid-layer
2070          * should keep its own freeze count and use
2071          * a bottom half handler to run the queues
2072          * so we can unblock with our own lock held.
2073          */
2074         if (unblock_reqs)
2075                 scsi_unblock_requests(ahc->platform_data->host);
2076 }
2077
2078 static int
2079 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2080 {
2081         struct ahc_softc *ahc;
2082         struct ahc_linux_device *dev;
2083         struct scb *pending_scb;
2084         u_int  saved_scbptr;
2085         u_int  active_scb_index;
2086         u_int  last_phase;
2087         u_int  saved_scsiid;
2088         u_int  cdb_byte;
2089         int    retval;
2090         int    was_paused;
2091         int    paused;
2092         int    wait;
2093         int    disconnected;
2094         unsigned long flags;
2095
2096         pending_scb = NULL;
2097         paused = FALSE;
2098         wait = FALSE;
2099         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2100
2101         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2102                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2103
2104         printf("CDB:");
2105         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2106                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2107         printf("\n");
2108
2109         ahc_lock(ahc, &flags);
2110
2111         /*
2112          * First determine if we currently own this command.
2113          * Start by searching the device queue.  If not found
2114          * there, check the pending_scb list.  If not found
2115          * at all, and the system wanted us to just abort the
2116          * command, return success.
2117          */
2118         dev = scsi_transport_device_data(cmd->device);
2119
2120         if (dev == NULL) {
2121                 /*
2122                  * No target device for this command exists,
2123                  * so we must not still own the command.
2124                  */
2125                 printf("%s:%d:%d:%d: Is not an active device\n",
2126                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2127                        cmd->device->lun);
2128                 retval = SUCCESS;
2129                 goto no_cmd;
2130         }
2131
2132         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2133          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2134                                        cmd->device->channel + 'A',
2135                                        cmd->device->lun,
2136                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2137                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2138                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2139                        cmd->device->lun);
2140                 retval = SUCCESS;
2141                 goto done;
2142         }
2143
2144         /*
2145          * See if we can find a matching cmd in the pending list.
2146          */
2147         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2148                 if (pending_scb->io_ctx == cmd)
2149                         break;
2150         }
2151
2152         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2153
2154                 /* Any SCB for this device will do for a target reset */
2155                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2156                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2157                                           scmd_channel(cmd) + 'A',
2158                                           CAM_LUN_WILDCARD,
2159                                           SCB_LIST_NULL, ROLE_INITIATOR))
2160                                 break;
2161                 }
2162         }
2163
2164         if (pending_scb == NULL) {
2165                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2166                 goto no_cmd;
2167         }
2168
2169         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2170                 /*
2171                  * We can't queue two recovery actions using the same SCB
2172                  */
2173                 retval = FAILED;
2174                 goto  done;
2175         }
2176
2177         /*
2178          * Ensure that the card doesn't do anything
2179          * behind our back and that we didn't "just" miss
2180          * an interrupt that would affect this cmd.
2181          */
2182         was_paused = ahc_is_paused(ahc);
2183         ahc_pause_and_flushwork(ahc);
2184         paused = TRUE;
2185
2186         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2187                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2188                 goto no_cmd;
2189         }
2190
2191         printf("%s: At time of recovery, card was %spaused\n",
2192                ahc_name(ahc), was_paused ? "" : "not ");
2193         ahc_dump_card_state(ahc);
2194
2195         disconnected = TRUE;
2196         if (flag == SCB_ABORT) {
2197                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2198                                        cmd->device->channel + 'A',
2199                                        cmd->device->lun,
2200                                        pending_scb->hscb->tag,
2201                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2202                                        SEARCH_COMPLETE) > 0) {
2203                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2204                                ahc_name(ahc), cmd->device->channel,
2205                                         cmd->device->id, cmd->device->lun);
2206                         retval = SUCCESS;
2207                         goto done;
2208                 }
2209         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2210                                       cmd->device->channel + 'A',
2211                                       cmd->device->lun, pending_scb->hscb->tag,
2212                                       ROLE_INITIATOR, /*status*/0,
2213                                       SEARCH_COUNT) > 0) {
2214                 disconnected = FALSE;
2215         }
2216
2217         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2218                 struct scb *bus_scb;
2219
2220                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2221                 if (bus_scb == pending_scb)
2222                         disconnected = FALSE;
2223                 else if (flag != SCB_ABORT
2224                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2225                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2226                         disconnected = FALSE;
2227         }
2228
2229         /*
2230          * At this point, pending_scb is the scb associated with the
2231          * passed in command.  That command is currently active on the
2232          * bus, is in the disconnected state, or we're hoping to find
2233          * a command for the same target active on the bus to abuse to
2234          * send a BDR.  Queue the appropriate message based on which of
2235          * these states we are in.
2236          */
2237         last_phase = ahc_inb(ahc, LASTPHASE);
2238         saved_scbptr = ahc_inb(ahc, SCBPTR);
2239         active_scb_index = ahc_inb(ahc, SCB_TAG);
2240         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2241         if (last_phase != P_BUSFREE
2242          && (pending_scb->hscb->tag == active_scb_index
2243           || (flag == SCB_DEVICE_RESET
2244            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2245
2246                 /*
2247                  * We're active on the bus, so assert ATN
2248                  * and hope that the target responds.
2249                  */
2250                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2251                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2252                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2253                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2254                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2255                 wait = TRUE;
2256         } else if (disconnected) {
2257
2258                 /*
2259                  * Actually re-queue this SCB in an attempt
2260                  * to select the device before it reconnects.
2261                  * In either case (selection or reselection),
2262                  * we will now issue the approprate message
2263                  * to the timed-out device.
2264                  *
2265                  * Set the MK_MESSAGE control bit indicating
2266                  * that we desire to send a message.  We
2267                  * also set the disconnected flag since
2268                  * in the paging case there is no guarantee
2269                  * that our SCB control byte matches the
2270                  * version on the card.  We don't want the
2271                  * sequencer to abort the command thinking
2272                  * an unsolicited reselection occurred.
2273                  */
2274                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2275                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2276
2277                 /*
2278                  * Remove any cached copy of this SCB in the
2279                  * disconnected list in preparation for the
2280                  * queuing of our abort SCB.  We use the
2281                  * same element in the SCB, SCB_NEXT, for
2282                  * both the qinfifo and the disconnected list.
2283                  */
2284                 ahc_search_disc_list(ahc, cmd->device->id,
2285                                      cmd->device->channel + 'A',
2286                                      cmd->device->lun, pending_scb->hscb->tag,
2287                                      /*stop_on_first*/TRUE,
2288                                      /*remove*/TRUE,
2289                                      /*save_state*/FALSE);
2290
2291                 /*
2292                  * In the non-paging case, the sequencer will
2293                  * never re-reference the in-core SCB.
2294                  * To make sure we are notified during
2295                  * reslection, set the MK_MESSAGE flag in
2296                  * the card's copy of the SCB.
2297                  */
2298                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2299                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2300                         ahc_outb(ahc, SCB_CONTROL,
2301                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2302                 }
2303
2304                 /*
2305                  * Clear out any entries in the QINFIFO first
2306                  * so we are the next SCB for this target
2307                  * to run.
2308                  */
2309                 ahc_search_qinfifo(ahc, cmd->device->id,
2310                                    cmd->device->channel + 'A',
2311                                    cmd->device->lun, SCB_LIST_NULL,
2312                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2313                                    SEARCH_COMPLETE);
2314                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2315                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2316                 ahc_print_path(ahc, pending_scb);
2317                 printf("Device is disconnected, re-queuing SCB\n");
2318                 wait = TRUE;
2319         } else {
2320                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2321                 retval = FAILED;
2322                 goto done;
2323         }
2324
2325 no_cmd:
2326         /*
2327          * Our assumption is that if we don't have the command, no
2328          * recovery action was required, so we return success.  Again,
2329          * the semantics of the mid-layer recovery engine are not
2330          * well defined, so this may change in time.
2331          */
2332         retval = SUCCESS;
2333 done:
2334         if (paused)
2335                 ahc_unpause(ahc);
2336         if (wait) {
2337                 DECLARE_COMPLETION_ONSTACK(done);
2338
2339                 ahc->platform_data->eh_done = &done;
2340                 ahc_unlock(ahc, &flags);
2341
2342                 printf("Recovery code sleeping\n");
2343                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2344                         ahc_lock(ahc, &flags);
2345                         ahc->platform_data->eh_done = NULL;
2346                         ahc_unlock(ahc, &flags);
2347
2348                         printf("Timer Expired\n");
2349                         retval = FAILED;
2350                 }
2351                 printf("Recovery code awake\n");
2352         } else
2353                 ahc_unlock(ahc, &flags);
2354         return (retval);
2355 }
2356
2357 void
2358 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2359 {
2360 }
2361
2362 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2363 {
2364         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2365         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2366         struct ahc_devinfo devinfo;
2367         unsigned long flags;
2368
2369         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2370                             starget->channel + 'A', ROLE_INITIATOR);
2371         ahc_lock(ahc, &flags);
2372         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2373         ahc_unlock(ahc, &flags);
2374 }
2375
2376 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2377 {
2378         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2379         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2380         struct ahc_tmode_tstate *tstate;
2381         struct ahc_initiator_tinfo *tinfo
2382                 = ahc_fetch_transinfo(ahc,
2383                                       starget->channel + 'A',
2384                                       shost->this_id, starget->id, &tstate);
2385         struct ahc_devinfo devinfo;
2386         unsigned int ppr_options = tinfo->goal.ppr_options;
2387         unsigned long flags;
2388         unsigned long offset = tinfo->goal.offset;
2389         struct ahc_syncrate *syncrate;
2390
2391         if (offset == 0)
2392                 offset = MAX_OFFSET;
2393
2394         if (period < 9)
2395                 period = 9;     /* 12.5ns is our minimum */
2396         if (period == 9) {
2397                 if (spi_max_width(starget))
2398                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2399                 else
2400                         /* need wide for DT and need DT for 12.5 ns */
2401                         period = 10;
2402         }
2403
2404         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2405                             starget->channel + 'A', ROLE_INITIATOR);
2406
2407         /* all PPR requests apart from QAS require wide transfers */
2408         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2409                 if (spi_width(starget) == 0)
2410                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2411         }
2412
2413         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2414         ahc_lock(ahc, &flags);
2415         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2416                          ppr_options, AHC_TRANS_GOAL, FALSE);
2417         ahc_unlock(ahc, &flags);
2418 }
2419
2420 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2421 {
2422         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2423         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2424         struct ahc_tmode_tstate *tstate;
2425         struct ahc_initiator_tinfo *tinfo
2426                 = ahc_fetch_transinfo(ahc,
2427                                       starget->channel + 'A',
2428                                       shost->this_id, starget->id, &tstate);
2429         struct ahc_devinfo devinfo;
2430         unsigned int ppr_options = 0;
2431         unsigned int period = 0;
2432         unsigned long flags;
2433         struct ahc_syncrate *syncrate = NULL;
2434
2435         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2436                             starget->channel + 'A', ROLE_INITIATOR);
2437         if (offset != 0) {
2438                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2439                 period = tinfo->goal.period;
2440                 ppr_options = tinfo->goal.ppr_options;
2441         }
2442         ahc_lock(ahc, &flags);
2443         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2444                          ppr_options, AHC_TRANS_GOAL, FALSE);
2445         ahc_unlock(ahc, &flags);
2446 }
2447
2448 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2449 {
2450         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2451         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2452         struct ahc_tmode_tstate *tstate;
2453         struct ahc_initiator_tinfo *tinfo
2454                 = ahc_fetch_transinfo(ahc,
2455                                       starget->channel + 'A',
2456                                       shost->this_id, starget->id, &tstate);
2457         struct ahc_devinfo devinfo;
2458         unsigned int ppr_options = tinfo->goal.ppr_options
2459                 & ~MSG_EXT_PPR_DT_REQ;
2460         unsigned int period = tinfo->goal.period;
2461         unsigned int width = tinfo->goal.width;
2462         unsigned long flags;
2463         struct ahc_syncrate *syncrate;
2464
2465         if (dt && spi_max_width(starget)) {
2466                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2467                 if (!width)
2468                         ahc_linux_set_width(starget, 1);
2469         } else if (period == 9)
2470                 period = 10;    /* if resetting DT, period must be >= 25ns */
2471
2472         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2473                             starget->channel + 'A', ROLE_INITIATOR);
2474         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2475         ahc_lock(ahc, &flags);
2476         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2477                          ppr_options, AHC_TRANS_GOAL, FALSE);
2478         ahc_unlock(ahc, &flags);
2479 }
2480
2481 #if 0
2482 /* FIXME: This code claims to support IU and QAS.  However, the actual
2483  * sequencer code and aic7xxx_core have no support for these parameters and
2484  * will get into a bad state if they're negotiated.  Do not enable this
2485  * unless you know what you're doing */
2486 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2487 {
2488         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2489         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2490         struct ahc_tmode_tstate *tstate;
2491         struct ahc_initiator_tinfo *tinfo
2492                 = ahc_fetch_transinfo(ahc,
2493                                       starget->channel + 'A',
2494                                       shost->this_id, starget->id, &tstate);
2495         struct ahc_devinfo devinfo;
2496         unsigned int ppr_options = tinfo->goal.ppr_options
2497                 & ~MSG_EXT_PPR_QAS_REQ;
2498         unsigned int period = tinfo->goal.period;
2499         unsigned long flags;
2500         struct ahc_syncrate *syncrate;
2501
2502         if (qas)
2503                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2504
2505         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2506                             starget->channel + 'A', ROLE_INITIATOR);
2507         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2508         ahc_lock(ahc, &flags);
2509         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2510                          ppr_options, AHC_TRANS_GOAL, FALSE);
2511         ahc_unlock(ahc, &flags);
2512 }
2513
2514 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2515 {
2516         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2517         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2518         struct ahc_tmode_tstate *tstate;
2519         struct ahc_initiator_tinfo *tinfo
2520                 = ahc_fetch_transinfo(ahc,
2521                                       starget->channel + 'A',
2522                                       shost->this_id, starget->id, &tstate);
2523         struct ahc_devinfo devinfo;
2524         unsigned int ppr_options = tinfo->goal.ppr_options
2525                 & ~MSG_EXT_PPR_IU_REQ;
2526         unsigned int period = tinfo->goal.period;
2527         unsigned long flags;
2528         struct ahc_syncrate *syncrate;
2529
2530         if (iu)
2531                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2532
2533         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2534                             starget->channel + 'A', ROLE_INITIATOR);
2535         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2536         ahc_lock(ahc, &flags);
2537         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2538                          ppr_options, AHC_TRANS_GOAL, FALSE);
2539         ahc_unlock(ahc, &flags);
2540 }
2541 #endif
2542
2543 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2544 {
2545         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2546         unsigned long flags;
2547         u8 mode;
2548
2549         if (!(ahc->features & AHC_ULTRA2)) {
2550                 /* non-LVD chipset, may not have SBLKCTL reg */
2551                 spi_signalling(shost) =
2552                         ahc->features & AHC_HVD ?
2553                         SPI_SIGNAL_HVD :
2554                         SPI_SIGNAL_SE;
2555                 return;
2556         }
2557
2558         ahc_lock(ahc, &flags);
2559         ahc_pause(ahc);
2560         mode = ahc_inb(ahc, SBLKCTL);
2561         ahc_unpause(ahc);
2562         ahc_unlock(ahc, &flags);
2563
2564         if (mode & ENAB40)
2565                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2566         else if (mode & ENAB20)
2567                 spi_signalling(shost) = SPI_SIGNAL_SE;
2568         else
2569                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2570 }
2571
2572 static struct spi_function_template ahc_linux_transport_functions = {
2573         .set_offset     = ahc_linux_set_offset,
2574         .show_offset    = 1,
2575         .set_period     = ahc_linux_set_period,
2576         .show_period    = 1,
2577         .set_width      = ahc_linux_set_width,
2578         .show_width     = 1,
2579         .set_dt         = ahc_linux_set_dt,
2580         .show_dt        = 1,
2581 #if 0
2582         .set_iu         = ahc_linux_set_iu,
2583         .show_iu        = 1,
2584         .set_qas        = ahc_linux_set_qas,
2585         .show_qas       = 1,
2586 #endif
2587         .get_signalling = ahc_linux_get_signalling,
2588 };
2589
2590
2591
2592 static int __init
2593 ahc_linux_init(void)
2594 {
2595         /*
2596          * If we've been passed any parameters, process them now.
2597          */
2598         if (aic7xxx)
2599                 aic7xxx_setup(aic7xxx);
2600
2601         ahc_linux_transport_template =
2602                 spi_attach_transport(&ahc_linux_transport_functions);
2603         if (!ahc_linux_transport_template)
2604                 return -ENODEV;
2605
2606         scsi_transport_reserve_device(ahc_linux_transport_template,
2607                                       sizeof(struct ahc_linux_device));
2608
2609         ahc_linux_pci_init();
2610         ahc_linux_eisa_init();
2611         return 0;
2612 }
2613
2614 static void
2615 ahc_linux_exit(void)
2616 {
2617         ahc_linux_pci_exit();
2618         ahc_linux_eisa_exit();
2619         spi_release_transport(ahc_linux_transport_template);
2620 }
2621
2622 module_init(ahc_linux_init);
2623 module_exit(ahc_linux_exit);