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