drivers/scsi/aic7xxx/aic7xxx_osm.c

   1
   2 /*
   3  * Adaptec AIC7xxx device driver for Linux.
   4  *
   5  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   6  *
   7  * Copyright (c) 1994 John Aycock
   8  *   The University of Calgary Department of Computer Science.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  25  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  26  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  27  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  28  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  29  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  30  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  31  * ANSI SCSI-2 specification (draft 10c), ...
  32  *
  33  * --------------------------------------------------------------------------
  34  *
  35  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  36  *
  37  *  Substantially modified to include support for wide and twin bus
  38  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  39  *  SCB paging, and other rework of the code.
  40  *
  41  * --------------------------------------------------------------------------
  42  * Copyright (c) 1994-2000 Justin T. Gibbs.
  43  * Copyright (c) 2000-2001 Adaptec Inc.
  44  * All rights reserved.
  45  *
  46  * Redistribution and use in source and binary forms, with or without
  47  * modification, are permitted provided that the following conditions
  48  * are met:
  49  * 1. Redistributions of source code must retain the above copyright
  50  *    notice, this list of conditions, and the following disclaimer,
  51  *    without modification.
  52  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  53  *    substantially similar to the "NO WARRANTY" disclaimer below
  54  *    ("Disclaimer") and any redistribution must be conditioned upon
  55  *    including a substantially similar Disclaimer requirement for further
  56  *    binary redistribution.
  57  * 3. Neither the names of the above-listed copyright holders nor the names
  58  *    of any contributors may be used to endorse or promote products derived
  59  *    from this software without specific prior written permission.
  60  *
  61  * Alternatively, this software may be distributed under the terms of the
  62  * GNU General Public License ("GPL") version 2 as published by the Free
  63  * Software Foundation.
  64  *
  65  * NO WARRANTY
  66  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  67  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  68  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  69  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  70  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  71  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  72  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  73  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  74  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  75  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  76  * POSSIBILITY OF SUCH DAMAGES.
  77  *
  78  *---------------------------------------------------------------------------
  79  *
  80  *  Thanks also go to (in alphabetical order) the following:
  81  *
  82  *    Rory Bolt     - Sequencer bug fixes
  83  *    Jay Estabrook - Initial DEC Alpha support
  84  *    Doug Ledford  - Much needed abort/reset bug fixes
  85  *    Kai Makisara  - DMAing of SCBs
  86  *
  87  *  A Boot time option was also added for not resetting the scsi bus.
  88  *
  89  *    Form:  aic7xxx=extended
  90  *           aic7xxx=no_reset
  91  *           aic7xxx=verbose
  92  *
  93  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  94  *
  95  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  96  */
  97
  98 /*
  99  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
 100  *
 101  * Copyright (c) 1997-1999 Doug Ledford
 102  *
 103  * These changes are released under the same licensing terms as the FreeBSD
 104  * driver written by Justin Gibbs.  Please see his Copyright notice above
 105  * for the exact terms and conditions covering my changes as well as the
 106  * warranty statement.
 107  *
 108  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 109  * but are not limited to:
 110  *
 111  *  1: Import of the latest FreeBSD sequencer code for this driver
 112  *  2: Modification of kernel code to accommodate different sequencer semantics
 113  *  3: Extensive changes throughout kernel portion of driver to improve
 114  *     abort/reset processing and error hanndling
 115  *  4: Other work contributed by various people on the Internet
 116  *  5: Changes to printk information and verbosity selection code
 117  *  6: General reliability related changes, especially in IRQ management
 118  *  7: Modifications to the default probe/attach order for supported cards
 119  *  8: SMP friendliness has been improved
 120  *
 121  */
 122
 123 #include "aic7xxx_osm.h"
 124 #include "aic7xxx_inline.h"
 125 #include <scsi/scsicam.h>
 126
 127 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 128
 129 #include <linux/init.h>         /* __setup */
 130 #include <linux/mm.h>           /* For fetching system memory size */
 131 #include <linux/blkdev.h>               /* For block_size() */
 132 #include <linux/delay.h>        /* For ssleep/msleep */
 133 #include <linux/slab.h>
 134
 135
 136 /*
 137  * Set this to the delay in seconds after SCSI bus reset.
 138  * Note, we honor this only for the initial bus reset.
 139  * The scsi error recovery code performs its own bus settle
 140  * delay handling for error recovery actions.
 141  */
 142 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 143 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 144 #else
 145 #define AIC7XXX_RESET_DELAY 5000
 146 #endif
 147
 148 /*
 149  * To change the default number of tagged transactions allowed per-device,
 150  * add a line to the lilo.conf file like:
 151  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 152  * which will result in the first four devices on the first two
 153  * controllers being set to a tagged queue depth of 32.
 154  *
 155  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 156  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 157  * for channel 1.
 158  */
 159 typedef struct {
 160         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 161 } adapter_tag_info_t;
 162
 163 /*
 164  * Modify this as you see fit for your system.
 165  *
 166  * 0                    tagged queuing disabled
 167  * 1 <= n <= 253        n == max tags ever dispatched.
 168  *
 169  * The driver will throttle the number of commands dispatched to a
 170  * device if it returns queue full.  For devices with a fixed maximum
 171  * queue depth, the driver will eventually determine this depth and
 172  * lock it in (a console message is printed to indicate that a lock
 173  * has occurred).  On some devices, queue full is returned for a temporary
 174  * resource shortage.  These devices will return queue full at varying
 175  * depths.  The driver will throttle back when the queue fulls occur and
 176  * attempt to slowly increase the depth over time as the device recovers
 177  * from the resource shortage.
 178  *
 179  * In this example, the first line will disable tagged queueing for all
 180  * the devices on the first probed aic7xxx adapter.
 181  *
 182  * The second line enables tagged queueing with 4 commands/LUN for IDs
 183  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 184  * driver to attempt to use up to 64 tags for ID 1.
 185  *
 186  * The third line is the same as the first line.
 187  *
 188  * The fourth line disables tagged queueing for devices 0 and 3.  It
 189  * enables tagged queueing for the other IDs, with 16 commands/LUN
 190  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 191  * IDs 2, 5-7, and 9-15.
 192  */
 193
 194 /*
 195  * NOTE: The below structure is for reference only, the actual structure
 196  *       to modify in order to change things is just below this comment block.
 197 adapter_tag_info_t aic7xxx_tag_info[] =
 198 {
 199         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 200         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 201         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 202         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 203 };
 204 */
 205
 206 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 207 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 208 #else
 209 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 210 #endif
 211
 212 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 213         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 214         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 215         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 216         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 217         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 218         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 219         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 220         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 221 }
 222
 223 /*
 224  * By default, use the number of commands specified by
 225  * the users kernel configuration.
 226  */
 227 static adapter_tag_info_t aic7xxx_tag_info[] =
 228 {
 229         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 230         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 231         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 232         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 233         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 234         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 235         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 236         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 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 };
 246
 247 /*
 248  * There should be a specific return value for this in scsi.h, but
 249  * it seems that most drivers ignore it.
 250  */
 251 #define DID_UNDERFLOW   DID_ERROR
 252
 253 void
 254 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 255 {
 256         printk("(scsi%d:%c:%d:%d): ",
 257                ahc->platform_data->host->host_no,
 258                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 259                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 260                scb != NULL ? SCB_GET_LUN(scb) : -1);
 261 }
 262
 263 /*
 264  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 265  *       cards in the system.  This should be fixed.  Exceptions to this
 266  *       rule are noted in the comments.
 267  */
 268
 269 /*
 270  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 271  * has no effect on any later resets that might occur due to things like
 272  * SCSI bus timeouts.
 273  */
 274 static uint32_t aic7xxx_no_reset;
 275
 276 /*
 277  * Should we force EXTENDED translation on a controller.
 278  *     0 == Use whatever is in the SEEPROM or default to off
 279  *     1 == Use whatever is in the SEEPROM or default to on
 280  */
 281 static uint32_t aic7xxx_extended;
 282
 283 /*
 284  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 285  * dubious at best.  To my knowledge, this option has never actually
 286  * solved a PCI parity problem, but on certain machines with broken PCI
 287  * chipset configurations where stray PCI transactions with bad parity are
 288  * the norm rather than the exception, the error messages can be overwhelming.
 289  * It's included in the driver for completeness.
 290  *   0     = Shut off PCI parity check
 291  *   non-0 = reverse polarity pci parity checking
 292  */
 293 static uint32_t aic7xxx_pci_parity = ~0;
 294
 295 /*
 296  * There are lots of broken chipsets in the world.  Some of them will
 297  * violate the PCI spec when we issue byte sized memory writes to our
 298  * controller.  I/O mapped register access, if allowed by the given
 299  * platform, will work in almost all cases.
 300  */
 301 uint32_t aic7xxx_allow_memio = ~0;
 302
 303 /*
 304  * So that we can set how long each device is given as a selection timeout.
 305  * The table of values goes like this:
 306  *   0 - 256ms
 307  *   1 - 128ms
 308  *   2 - 64ms
 309  *   3 - 32ms
 310  * We default to 256ms because some older devices need a longer time
 311  * to respond to initial selection.
 312  */
 313 static uint32_t aic7xxx_seltime;
 314
 315 /*
 316  * Certain devices do not perform any aging on commands.  Should the
 317  * device be saturated by commands in one portion of the disk, it is
 318  * possible for transactions on far away sectors to never be serviced.
 319  * To handle these devices, we can periodically send an ordered tag to
 320  * force all outstanding transactions to be serviced prior to a new
 321  * transaction.
 322  */
 323 static uint32_t aic7xxx_periodic_otag;
 324
 325 /*
 326  * Module information and settable options.
 327  */
 328 static char *aic7xxx = NULL;
 329
 330 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 331 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
 332 MODULE_LICENSE("Dual BSD/GPL");
 333 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 334 module_param(aic7xxx, charp, 0444);
 335 MODULE_PARM_DESC(aic7xxx,
 336 "period-delimited options string:\n"
 337 "       verbose                 Enable verbose/diagnostic logging\n"
 338 "       allow_memio             Allow device registers to be memory mapped\n"
 339 "       debug                   Bitmask of debug values to enable\n"
 340 "       no_probe                Toggle EISA/VLB controller probing\n"
 341 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 342 "       no_reset                Suppress initial bus resets\n"
 343 "       extended                Enable extended geometry on all controllers\n"
 344 "       periodic_otag           Send an ordered tagged transaction\n"
 345 "                               periodically to prevent tag starvation.\n"
 346 "                               This may be required by some older disk\n"
 347 "                               drives or RAID arrays.\n"
 348 "       tag_info:<tag_str>      Set per-target tag depth\n"
 349 "       global_tag_depth:<int>  Global tag depth for every target\n"
 350 "                               on every bus\n"
 351 "       seltime:<int>           Selection Timeout\n"
 352 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 353 "\n"
 354 "       Sample modprobe configuration file:\n"
 355 "       #       Toggle EISA/VLB probing\n"
 356 "       #       Set tag depth on Controller 1/Target 1 to 10 tags\n"
 357 "       #       Shorten the selection timeout to 128ms\n"
 358 "\n"
 359 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 360 );
 361
 362 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 363                                          struct scsi_device *,
 364                                          struct scb *);
 365 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 366                                          struct scsi_cmnd *cmd);
 367 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 368 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 369 static int  ahc_linux_queue_recovery_cmd(struct scsi_device *sdev,
 370                                          struct scsi_cmnd *cmd);
 371 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 372 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 373                                      struct ahc_devinfo *devinfo);
 374 static void ahc_linux_device_queue_depth(struct scsi_device *);
 375 static int ahc_linux_run_command(struct ahc_softc*,
 376                                  struct ahc_linux_device *,
 377                                  struct scsi_cmnd *);
 378 static void ahc_linux_setup_tag_info_global(char *p);
 379 static int  aic7xxx_setup(char *s);
 380
 381 static int ahc_linux_unit;
 382
 383
 384 /************************** OS Utility Wrappers *******************************/
 385 void
 386 ahc_delay(long usec)
 387 {
 388         /*
 389          * udelay on Linux can have problems for
 390          * multi-millisecond waits.  Wait at most
 391          * 1024us per call.
 392          */
 393         while (usec > 0) {
 394                 udelay(usec % 1024);
 395                 usec -= 1024;
 396         }
 397 }
 398
 399 /***************************** Low Level I/O **********************************/
 400 uint8_t
 401 ahc_inb(struct ahc_softc * ahc, long port)
 402 {
 403         uint8_t x;
 404
 405         if (ahc->tag == BUS_SPACE_MEMIO) {
 406                 x = readb(ahc->bsh.maddr + port);
 407         } else {
 408                 x = inb(ahc->bsh.ioport + port);
 409         }
 410         mb();
 411         return (x);
 412 }
 413
 414 void
 415 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
 416 {
 417         if (ahc->tag == BUS_SPACE_MEMIO) {
 418                 writeb(val, ahc->bsh.maddr + port);
 419         } else {
 420                 outb(val, ahc->bsh.ioport + port);
 421         }
 422         mb();
 423 }
 424
 425 void
 426 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 427 {
 428         int i;
 429
 430         /*
 431          * There is probably a more efficient way to do this on Linux
 432          * but we don't use this for anything speed critical and this
 433          * should work.
 434          */
 435         for (i = 0; i < count; i++)
 436                 ahc_outb(ahc, port, *array++);
 437 }
 438
 439 void
 440 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 441 {
 442         int i;
 443
 444         /*
 445          * There is probably a more efficient way to do this on Linux
 446          * but we don't use this for anything speed critical and this
 447          * should work.
 448          */
 449         for (i = 0; i < count; i++)
 450                 *array++ = ahc_inb(ahc, port);
 451 }
 452
 453 /********************************* Inlines ************************************/
 454 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 455
 456 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 457                                       struct ahc_dma_seg *sg,
 458                                       dma_addr_t addr, bus_size_t len);
 459
 460 static void
 461 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 462 {
 463         struct scsi_cmnd *cmd;
 464
 465         cmd = scb->io_ctx;
 466         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 467
 468         scsi_dma_unmap(cmd);
 469 }
 470
 471 static int
 472 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 473                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 474 {
 475         int      consumed;
 476
 477         if ((scb->sg_count + 1) > AHC_NSEG)
 478                 panic("Too few segs for dma mapping.  "
 479                       "Increase AHC_NSEG\n");
 480
 481         consumed = 1;
 482         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 483         scb->platform_data->xfer_len += len;
 484
 485         if (sizeof(dma_addr_t) > 4
 486          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 487                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 488
 489         sg->len = ahc_htole32(len);
 490         return (consumed);
 491 }
 492
 493 /*
 494  * Return a string describing the driver.
 495  */
 496 static const char *
 497 ahc_linux_info(struct Scsi_Host *host)
 498 {
 499         static char buffer[512];
 500         char    ahc_info[256];
 501         char   *bp;
 502         struct ahc_softc *ahc;
 503
 504         bp = &buffer[0];
 505         ahc = *(struct ahc_softc **)host->hostdata;
 506         memset(bp, 0, sizeof(buffer));
 507         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
 508                         "        <");
 509         strcat(bp, ahc->description);
 510         strcat(bp, ">\n"
 511                         "        ");
 512         ahc_controller_info(ahc, ahc_info);
 513         strcat(bp, ahc_info);
 514         strcat(bp, "\n");
 515
 516         return (bp);
 517 }
 518
 519 /*
 520  * Queue an SCB to the controller.
 521  */
 522 static int ahc_linux_queue_lck(struct scsi_cmnd *cmd)
 523 {
 524         struct   ahc_softc *ahc;
 525         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 526         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 527         unsigned long flags;
 528
 529         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 530
 531         ahc_lock(ahc, &flags);
 532         if (ahc->platform_data->qfrozen == 0) {
 533                 cmd->result = CAM_REQ_INPROG << 16;
 534                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 535         }
 536         ahc_unlock(ahc, &flags);
 537
 538         return rtn;
 539 }
 540
 541 static DEF_SCSI_QCMD(ahc_linux_queue)
 542
 543 static inline struct scsi_target **
 544 ahc_linux_target_in_softc(struct scsi_target *starget)
 545 {
 546         struct  ahc_softc *ahc =
 547                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 548         unsigned int target_offset;
 549
 550         target_offset = starget->id;
 551         if (starget->channel != 0)
 552                 target_offset += 8;
 553
 554         return &ahc->platform_data->starget[target_offset];
 555 }
 556
 557 static int
 558 ahc_linux_target_alloc(struct scsi_target *starget)
 559 {
 560         struct  ahc_softc *ahc =
 561                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 562         struct seeprom_config *sc = ahc->seep_config;
 563         unsigned long flags;
 564         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 565         unsigned short scsirate;
 566         struct ahc_devinfo devinfo;
 567         char channel = starget->channel + 'A';
 568         unsigned int our_id = ahc->our_id;
 569         unsigned int target_offset;
 570
 571         target_offset = starget->id;
 572         if (starget->channel != 0)
 573                 target_offset += 8;
 574
 575         if (starget->channel)
 576                 our_id = ahc->our_id_b;
 577
 578         ahc_lock(ahc, &flags);
 579
 580         BUG_ON(*ahc_targp != NULL);
 581
 582         *ahc_targp = starget;
 583
 584         if (sc) {
 585                 int maxsync = AHC_SYNCRATE_DT;
 586                 int ultra = 0;
 587                 int flags = sc->device_flags[target_offset];
 588
 589                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 590                     if (flags & CFSYNCHISULTRA)
 591                         ultra = 1;
 592                 } else if (flags & CFULTRAEN)
 593                         ultra = 1;
 594                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 595                  * change it to ultra=0, CFXFER = 0 */
 596                 if(ultra && (flags & CFXFER) == 0x04) {
 597                         ultra = 0;
 598                         flags &= ~CFXFER;
 599                 }
 600
 601                 if ((ahc->features & AHC_ULTRA2) != 0) {
 602                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 603                 } else {
 604                         scsirate = (flags & CFXFER) << 4;
 605                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 606                                 AHC_SYNCRATE_FAST;
 607                 }
 608                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 609                 if (!(flags & CFSYNCH))
 610                         spi_max_offset(starget) = 0;
 611                 spi_min_period(starget) =
 612                         ahc_find_period(ahc, scsirate, maxsync);
 613         }
 614         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 615                             CAM_LUN_WILDCARD, channel,
 616                             ROLE_INITIATOR);
 617         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 618                          AHC_TRANS_GOAL, /*paused*/FALSE);
 619         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 620                       AHC_TRANS_GOAL, /*paused*/FALSE);
 621         ahc_unlock(ahc, &flags);
 622
 623         return 0;
 624 }
 625
 626 static void
 627 ahc_linux_target_destroy(struct scsi_target *starget)
 628 {
 629         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 630
 631         *ahc_targp = NULL;
 632 }
 633
 634 static int
 635 ahc_linux_slave_alloc(struct scsi_device *sdev)
 636 {
 637         struct  ahc_softc *ahc =
 638                 *((struct ahc_softc **)sdev->host->hostdata);
 639         struct scsi_target *starget = sdev->sdev_target;
 640         struct ahc_linux_device *dev;
 641
 642         if (bootverbose)
 643                 printk("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 644
 645         dev = scsi_transport_device_data(sdev);
 646         memset(dev, 0, sizeof(*dev));
 647
 648         /*
 649          * We start out life using untagged
 650          * transactions of which we allow one.
 651          */
 652         dev->openings = 1;
 653
 654         /*
 655          * Set maxtags to 0.  This will be changed if we
 656          * later determine that we are dealing with
 657          * a tagged queuing capable device.
 658          */
 659         dev->maxtags = 0;
 660
 661         spi_period(starget) = 0;
 662
 663         return 0;
 664 }
 665
 666 static int
 667 ahc_linux_slave_configure(struct scsi_device *sdev)
 668 {
 669         if (bootverbose)
 670                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 671
 672         ahc_linux_device_queue_depth(sdev);
 673
 674         /* Initial Domain Validation */
 675         if (!spi_initial_dv(sdev->sdev_target))
 676                 spi_dv_device(sdev);
 677
 678         return 0;
 679 }
 680
 681 #if defined(__i386__)
 682 /*
 683  * Return the disk geometry for the given SCSI device.
 684  */
 685 static int
 686 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 687                     sector_t capacity, int geom[])
 688 {
 689         int      heads;
 690         int      sectors;
 691         int      cylinders;
 692         int      extended;
 693         struct   ahc_softc *ahc;
 694         u_int    channel;
 695
 696         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 697         channel = sdev_channel(sdev);
 698
 699         if (scsi_partsize(bdev, capacity, geom))
 700                 return 0;
 701
 702         heads = 64;
 703         sectors = 32;
 704         cylinders = aic_sector_div(capacity, heads, sectors);
 705
 706         if (aic7xxx_extended != 0)
 707                 extended = 1;
 708         else if (channel == 0)
 709                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 710         else
 711                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 712         if (extended && cylinders >= 1024) {
 713                 heads = 255;
 714                 sectors = 63;
 715                 cylinders = aic_sector_div(capacity, heads, sectors);
 716         }
 717         geom[0] = heads;
 718         geom[1] = sectors;
 719         geom[2] = cylinders;
 720         return (0);
 721 }
 722 #endif
 723
 724 /*
 725  * Abort the current SCSI command(s).
 726  */
 727 static int
 728 ahc_linux_abort(struct scsi_cmnd *cmd)
 729 {
 730         int error;
 731
 732         error = ahc_linux_queue_recovery_cmd(cmd->device, cmd);
 733         if (error != SUCCESS)
 734                 printk("aic7xxx_abort returns 0x%x\n", error);
 735         return (error);
 736 }
 737
 738 /*
 739  * Attempt to send a target reset message to the device that timed out.
 740  */
 741 static int
 742 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 743 {
 744         int error;
 745
 746         error = ahc_linux_queue_recovery_cmd(cmd->device, NULL);
 747         if (error != SUCCESS)
 748                 printk("aic7xxx_dev_reset returns 0x%x\n", error);
 749         return (error);
 750 }
 751
 752 /*
 753  * Reset the SCSI bus.
 754  */
 755 static int
 756 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 757 {
 758         struct ahc_softc *ahc;
 759         int    found;
 760         unsigned long flags;
 761
 762         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 763
 764         ahc_lock(ahc, &flags);
 765         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 766                                   /*initiate reset*/TRUE);
 767         ahc_unlock(ahc, &flags);
 768
 769         if (bootverbose)
 770                 printk("%s: SCSI bus reset delivered. "
 771                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 772
 773         return SUCCESS;
 774 }
 775
 776 struct scsi_host_template aic7xxx_driver_template = {
 777         .module                 = THIS_MODULE,
 778         .name                   = "aic7xxx",
 779         .proc_name              = "aic7xxx",
 780         .show_info              = ahc_linux_show_info,
 781         .write_info             = ahc_proc_write_seeprom,
 782         .info                   = ahc_linux_info,
 783         .queuecommand           = ahc_linux_queue,
 784         .eh_abort_handler       = ahc_linux_abort,
 785         .eh_device_reset_handler = ahc_linux_dev_reset,
 786         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 787 #if defined(__i386__)
 788         .bios_param             = ahc_linux_biosparam,
 789 #endif
 790         .can_queue              = AHC_MAX_QUEUE,
 791         .this_id                = -1,
 792         .max_sectors            = 8192,
 793         .cmd_per_lun            = 2,
 794         .slave_alloc            = ahc_linux_slave_alloc,
 795         .slave_configure        = ahc_linux_slave_configure,
 796         .target_alloc           = ahc_linux_target_alloc,
 797         .target_destroy         = ahc_linux_target_destroy,
 798 };
 799
 800 /**************************** Tasklet Handler *********************************/
 801
 802
 803 static inline unsigned int ahc_build_scsiid(struct ahc_softc *ahc,
 804                                             struct scsi_device *sdev)
 805 {
 806         unsigned int scsiid = (sdev->id << TID_SHIFT) & TID;
 807
 808         if (sdev->channel == 0)
 809                 scsiid |= ahc->our_id;
 810         else
 811                 scsiid |= ahc->our_id_b | TWIN_CHNLB;
 812         return scsiid;
 813 }
 814
 815 /******************************** Bus DMA *************************************/
 816 int
 817 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 818                    bus_size_t alignment, bus_size_t boundary,
 819                    dma_addr_t lowaddr, dma_addr_t highaddr,
 820                    bus_dma_filter_t *filter, void *filterarg,
 821                    bus_size_t maxsize, int nsegments,
 822                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 823 {
 824         bus_dma_tag_t dmat;
 825
 826         dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
 827         if (dmat == NULL)
 828                 return (ENOMEM);
 829
 830         /*
 831          * Linux is very simplistic about DMA memory.  For now don't
 832          * maintain all specification information.  Once Linux supplies
 833          * better facilities for doing these operations, or the
 834          * needs of this particular driver change, we might need to do
 835          * more here.
 836          */
 837         dmat->alignment = alignment;
 838         dmat->boundary = boundary;
 839         dmat->maxsize = maxsize;
 840         *ret_tag = dmat;
 841         return (0);
 842 }
 843
 844 void
 845 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 846 {
 847         kfree(dmat);
 848 }
 849
 850 int
 851 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 852                  int flags, bus_dmamap_t *mapp)
 853 {
 854         /* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
 855         *vaddr = dma_alloc_coherent(ahc->dev, dmat->maxsize, mapp, GFP_ATOMIC);
 856         if (*vaddr == NULL)
 857                 return ENOMEM;
 858         return 0;
 859 }
 860
 861 void
 862 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 863                 void* vaddr, bus_dmamap_t map)
 864 {
 865         dma_free_coherent(ahc->dev, dmat->maxsize, vaddr, map);
 866 }
 867
 868 int
 869 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 870                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 871                 void *cb_arg, int flags)
 872 {
 873         /*
 874          * Assume for now that this will only be used during
 875          * initialization and not for per-transaction buffer mapping.
 876          */
 877         bus_dma_segment_t stack_sg;
 878
 879         stack_sg.ds_addr = map;
 880         stack_sg.ds_len = dmat->maxsize;
 881         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 882         return (0);
 883 }
 884
 885 void
 886 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 887 {
 888 }
 889
 890 int
 891 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 892 {
 893         /* Nothing to do */
 894         return (0);
 895 }
 896
 897 static void
 898 ahc_linux_setup_tag_info_global(char *p)
 899 {
 900         int tags, i, j;
 901
 902         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 903         printk("Setting Global Tags= %d\n", tags);
 904
 905         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 906                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 907                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 908                 }
 909         }
 910 }
 911
 912 static void
 913 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 914 {
 915
 916         if ((instance >= 0) && (targ >= 0)
 917          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 918          && (targ < AHC_NUM_TARGETS)) {
 919                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 920                 if (bootverbose)
 921                         printk("tag_info[%d:%d] = %d\n", instance, targ, value);
 922         }
 923 }
 924
 925 static char *
 926 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 927                        void (*callback)(u_long, int, int, int32_t),
 928                        u_long callback_arg)
 929 {
 930         char    *tok_end;
 931         char    *tok_end2;
 932         int      i;
 933         int      instance;
 934         int      targ;
 935         int      done;
 936         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 937
 938         /* All options use a ':' name/arg separator */
 939         if (*opt_arg != ':')
 940                 return (opt_arg);
 941         opt_arg++;
 942         instance = -1;
 943         targ = -1;
 944         done = FALSE;
 945         /*
 946          * Restore separator that may be in
 947          * the middle of our option argument.
 948          */
 949         tok_end = strchr(opt_arg, '\0');
 950         if (tok_end < end)
 951                 *tok_end = ',';
 952         while (!done) {
 953                 switch (*opt_arg) {
 954                 case '{':
 955                         if (instance == -1) {
 956                                 instance = 0;
 957                         } else {
 958                                 if (depth > 1) {
 959                                         if (targ == -1)
 960                                                 targ = 0;
 961                                 } else {
 962                                         printk("Malformed Option %s\n",
 963                                                opt_name);
 964                                         done = TRUE;
 965                                 }
 966                         }
 967                         opt_arg++;
 968                         break;
 969                 case '}':
 970                         if (targ != -1)
 971                                 targ = -1;
 972                         else if (instance != -1)
 973                                 instance = -1;
 974                         opt_arg++;
 975                         break;
 976                 case ',':
 977                 case '.':
 978                         if (instance == -1)
 979                                 done = TRUE;
 980                         else if (targ >= 0)
 981                                 targ++;
 982                         else if (instance >= 0)
 983                                 instance++;
 984                         opt_arg++;
 985                         break;
 986                 case '\0':
 987                         done = TRUE;
 988                         break;
 989                 default:
 990                         tok_end = end;
 991                         for (i = 0; tok_list[i]; i++) {
 992                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 993                                 if ((tok_end2) && (tok_end2 < tok_end))
 994                                         tok_end = tok_end2;
 995                         }
 996                         callback(callback_arg, instance, targ,
 997                                  simple_strtol(opt_arg, NULL, 0));
 998                         opt_arg = tok_end;
 999                         break;
1000                 }
1001         }
1002         return (opt_arg);
1003 }
1004
1005 /*
1006  * Handle Linux boot parameters. This routine allows for assigning a value
1007  * to a parameter with a ':' between the parameter and the value.
1008  * ie. aic7xxx=stpwlev:1,extended
1009  */
1010 static int
1011 aic7xxx_setup(char *s)
1012 {
1013         int     i, n;
1014         char   *p;
1015         char   *end;
1016
1017         static const struct {
1018                 const char *name;
1019                 uint32_t *flag;
1020         } options[] = {
1021                 { "extended", &aic7xxx_extended },
1022                 { "no_reset", &aic7xxx_no_reset },
1023                 { "verbose", &aic7xxx_verbose },
1024                 { "allow_memio", &aic7xxx_allow_memio},
1025 #ifdef AHC_DEBUG
1026                 { "debug", &ahc_debug },
1027 #endif
1028                 { "periodic_otag", &aic7xxx_periodic_otag },
1029                 { "pci_parity", &aic7xxx_pci_parity },
1030                 { "seltime", &aic7xxx_seltime },
1031                 { "tag_info", NULL },
1032                 { "global_tag_depth", NULL },
1033                 { "dv", NULL }
1034         };
1035
1036         end = strchr(s, '\0');
1037
1038         /*
1039          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1040          * will never be 0 in this case.
1041          */
1042         n = 0;
1043
1044         while ((p = strsep(&s, ",.")) != NULL) {
1045                 if (*p == '\0')
1046                         continue;
1047                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1048
1049                         n = strlen(options[i].name);
1050                         if (strncmp(options[i].name, p, n) == 0)
1051                                 break;
1052                 }
1053                 if (i == ARRAY_SIZE(options))
1054                         continue;
1055
1056                 if (strncmp(p, "global_tag_depth", n) == 0) {
1057                         ahc_linux_setup_tag_info_global(p + n);
1058                 } else if (strncmp(p, "tag_info", n) == 0) {
1059                         s = ahc_parse_brace_option("tag_info", p + n, end,
1060                             2, ahc_linux_setup_tag_info, 0);
1061                 } else if (p[n] == ':') {
1062                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1063                 } else if (strncmp(p, "verbose", n) == 0) {
1064                         *(options[i].flag) = 1;
1065                 } else {
1066                         *(options[i].flag) ^= 0xFFFFFFFF;
1067                 }
1068         }
1069         return 1;
1070 }
1071
1072 __setup("aic7xxx=", aic7xxx_setup);
1073
1074 uint32_t aic7xxx_verbose;
1075
1076 int
1077 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1078 {
1079         char    buf[80];
1080         struct  Scsi_Host *host;
1081         char    *new_name;
1082         u_long  s;
1083         int     retval;
1084
1085         template->name = ahc->description;
1086         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1087         if (host == NULL)
1088                 return -ENOMEM;
1089
1090         *((struct ahc_softc **)host->hostdata) = ahc;
1091         ahc->platform_data->host = host;
1092         host->can_queue = AHC_MAX_QUEUE;
1093         host->cmd_per_lun = 2;
1094         /* XXX No way to communicate the ID for multiple channels */
1095         host->this_id = ahc->our_id;
1096         host->irq = ahc->platform_data->irq;
1097         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1098         host->max_lun = AHC_NUM_LUNS;
1099         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1100         host->sg_tablesize = AHC_NSEG;
1101         ahc_lock(ahc, &s);
1102         ahc_set_unit(ahc, ahc_linux_unit++);
1103         ahc_unlock(ahc, &s);
1104         sprintf(buf, "scsi%d", host->host_no);
1105         new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1106         if (new_name != NULL) {
1107                 strcpy(new_name, buf);
1108                 ahc_set_name(ahc, new_name);
1109         }
1110         host->unique_id = ahc->unit;
1111         ahc_linux_initialize_scsi_bus(ahc);
1112         ahc_intr_enable(ahc, TRUE);
1113
1114         host->transportt = ahc_linux_transport_template;
1115
1116         retval = scsi_add_host(host, ahc->dev);
1117         if (retval) {
1118                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1119                 scsi_host_put(host);
1120                 return retval;
1121         }
1122
1123         scsi_scan_host(host);
1124         return 0;
1125 }
1126
1127 /*
1128  * Place the SCSI bus into a known state by either resetting it,
1129  * or forcing transfer negotiations on the next command to any
1130  * target.
1131  */
1132 static void
1133 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1134 {
1135         int i;
1136         int numtarg;
1137         unsigned long s;
1138
1139         i = 0;
1140         numtarg = 0;
1141
1142         ahc_lock(ahc, &s);
1143
1144         if (aic7xxx_no_reset != 0)
1145                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1146
1147         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1148                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1149         else
1150                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1151
1152         if ((ahc->features & AHC_TWIN) != 0) {
1153
1154                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1155                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1156                 } else {
1157                         if (numtarg == 0)
1158                                 i = 8;
1159                         numtarg += 8;
1160                 }
1161         }
1162
1163         /*
1164          * Force negotiation to async for all targets that
1165          * will not see an initial bus reset.
1166          */
1167         for (; i < numtarg; i++) {
1168                 struct ahc_devinfo devinfo;
1169                 struct ahc_initiator_tinfo *tinfo;
1170                 struct ahc_tmode_tstate *tstate;
1171                 u_int our_id;
1172                 u_int target_id;
1173                 char channel;
1174
1175                 channel = 'A';
1176                 our_id = ahc->our_id;
1177                 target_id = i;
1178                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1179                         channel = 'B';
1180                         our_id = ahc->our_id_b;
1181                         target_id = i % 8;
1182                 }
1183                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1184                                             target_id, &tstate);
1185                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1186                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1187                 ahc_update_neg_request(ahc, &devinfo, tstate,
1188                                        tinfo, AHC_NEG_ALWAYS);
1189         }
1190         ahc_unlock(ahc, &s);
1191         /* Give the bus some time to recover */
1192         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1193                 ahc_linux_freeze_simq(ahc);
1194                 msleep(AIC7XXX_RESET_DELAY);
1195                 ahc_linux_release_simq(ahc);
1196         }
1197 }
1198
1199 int
1200 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1201 {
1202
1203         ahc->platform_data =
1204             kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
1205         if (ahc->platform_data == NULL)
1206                 return (ENOMEM);
1207         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1208         ahc_lockinit(ahc);
1209         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1210         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1211         if (aic7xxx_pci_parity == 0)
1212                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1213
1214         return (0);
1215 }
1216
1217 void
1218 ahc_platform_free(struct ahc_softc *ahc)
1219 {
1220         struct scsi_target *starget;
1221         int i;
1222
1223         if (ahc->platform_data != NULL) {
1224                 /* destroy all of the device and target objects */
1225                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1226                         starget = ahc->platform_data->starget[i];
1227                         if (starget != NULL) {
1228                                 ahc->platform_data->starget[i] = NULL;
1229                         }
1230                 }
1231
1232                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1233                         free_irq(ahc->platform_data->irq, ahc);
1234                 if (ahc->tag == BUS_SPACE_PIO
1235                  && ahc->bsh.ioport != 0)
1236                         release_region(ahc->bsh.ioport, 256);
1237                 if (ahc->tag == BUS_SPACE_MEMIO
1238                  && ahc->bsh.maddr != NULL) {
1239                         iounmap(ahc->bsh.maddr);
1240                         release_mem_region(ahc->platform_data->mem_busaddr,
1241                                            0x1000);
1242                 }
1243
1244                 if (ahc->platform_data->host)
1245                         scsi_host_put(ahc->platform_data->host);
1246
1247                 kfree(ahc->platform_data);
1248         }
1249 }
1250
1251 void
1252 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1253 {
1254         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1255                                 SCB_GET_CHANNEL(ahc, scb),
1256                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1257                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1258 }
1259
1260 void
1261 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1262                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1263 {
1264         struct ahc_linux_device *dev;
1265         int was_queuing;
1266         int now_queuing;
1267
1268         if (sdev == NULL)
1269                 return;
1270         dev = scsi_transport_device_data(sdev);
1271
1272         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1273         switch (alg) {
1274         default:
1275         case AHC_QUEUE_NONE:
1276                 now_queuing = 0;
1277                 break;
1278         case AHC_QUEUE_BASIC:
1279                 now_queuing = AHC_DEV_Q_BASIC;
1280                 break;
1281         case AHC_QUEUE_TAGGED:
1282                 now_queuing = AHC_DEV_Q_TAGGED;
1283                 break;
1284         }
1285         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1286          && (was_queuing != now_queuing)
1287          && (dev->active != 0)) {
1288                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1289                 dev->qfrozen++;
1290         }
1291
1292         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1293         if (now_queuing) {
1294                 u_int usertags;
1295
1296                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1297                 if (!was_queuing) {
1298                         /*
1299                          * Start out aggressively and allow our
1300                          * dynamic queue depth algorithm to take
1301                          * care of the rest.
1302                          */
1303                         dev->maxtags = usertags;
1304                         dev->openings = dev->maxtags - dev->active;
1305                 }
1306                 if (dev->maxtags == 0) {
1307                         /*
1308                          * Queueing is disabled by the user.
1309                          */
1310                         dev->openings = 1;
1311                 } else if (alg == AHC_QUEUE_TAGGED) {
1312                         dev->flags |= AHC_DEV_Q_TAGGED;
1313                         if (aic7xxx_periodic_otag != 0)
1314                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1315                 } else
1316                         dev->flags |= AHC_DEV_Q_BASIC;
1317         } else {
1318                 /* We can only have one opening. */
1319                 dev->maxtags = 0;
1320                 dev->openings =  1 - dev->active;
1321         }
1322         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1323         case AHC_DEV_Q_BASIC:
1324         case AHC_DEV_Q_TAGGED:
1325                 scsi_change_queue_depth(sdev,
1326                                 dev->openings + dev->active);
1327                 break;
1328         default:
1329                 /*
1330                  * We allow the OS to queue 2 untagged transactions to
1331                  * us at any time even though we can only execute them
1332                  * serially on the controller/device.  This should
1333                  * remove some latency.
1334                  */
1335                 scsi_change_queue_depth(sdev, 2);
1336                 break;
1337         }
1338 }
1339
1340 int
1341 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1342                         int lun, u_int tag, role_t role, uint32_t status)
1343 {
1344         return 0;
1345 }
1346
1347 static u_int
1348 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1349 {
1350         static int warned_user;
1351         u_int tags;
1352
1353         tags = 0;
1354         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1355                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1356                         if (warned_user == 0) {
1357
1358                                 printk(KERN_WARNING
1359 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1360 "aic7xxx: for installed controllers. Using defaults\n"
1361 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1362 "aic7xxx: the aic7xxx_osm..c source file.\n");
1363                                 warned_user++;
1364                         }
1365                         tags = AHC_MAX_QUEUE;
1366                 } else {
1367                         adapter_tag_info_t *tag_info;
1368
1369                         tag_info = &aic7xxx_tag_info[ahc->unit];
1370                         tags = tag_info->tag_commands[devinfo->target_offset];
1371                         if (tags > AHC_MAX_QUEUE)
1372                                 tags = AHC_MAX_QUEUE;
1373                 }
1374         }
1375         return (tags);
1376 }
1377
1378 /*
1379  * Determines the queue depth for a given device.
1380  */
1381 static void
1382 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1383 {
1384         struct  ahc_devinfo devinfo;
1385         u_int   tags;
1386         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1387
1388         ahc_compile_devinfo(&devinfo,
1389                             sdev->sdev_target->channel == 0
1390                           ? ahc->our_id : ahc->our_id_b,
1391                             sdev->sdev_target->id, sdev->lun,
1392                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1393                             ROLE_INITIATOR);
1394         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1395         if (tags != 0 && sdev->tagged_supported != 0) {
1396
1397                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1398                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1399                                devinfo.lun, AC_TRANSFER_NEG);
1400                 ahc_print_devinfo(ahc, &devinfo);
1401                 printk("Tagged Queuing enabled.  Depth %d\n", tags);
1402         } else {
1403                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1404                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1405                                devinfo.lun, AC_TRANSFER_NEG);
1406         }
1407 }
1408
1409 static int
1410 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1411                       struct scsi_cmnd *cmd)
1412 {
1413         struct   scb *scb;
1414         struct   hardware_scb *hscb;
1415         struct   ahc_initiator_tinfo *tinfo;
1416         struct   ahc_tmode_tstate *tstate;
1417         uint16_t mask;
1418         struct scb_tailq *untagged_q = NULL;
1419         int nseg;
1420
1421         /*
1422          * Schedule us to run later.  The only reason we are not
1423          * running is because the whole controller Q is frozen.
1424          */
1425         if (ahc->platform_data->qfrozen != 0)
1426                 return SCSI_MLQUEUE_HOST_BUSY;
1427
1428         /*
1429          * We only allow one untagged transaction
1430          * per target in the initiator role unless
1431          * we are storing a full busy target *lun*
1432          * table in SCB space.
1433          */
1434         if (!(cmd->flags & SCMD_TAGGED)
1435             && (ahc->features & AHC_SCB_BTT) == 0) {
1436                 int target_offset;
1437
1438                 target_offset = cmd->device->id + cmd->device->channel * 8;
1439                 untagged_q = &(ahc->untagged_queues[target_offset]);
1440                 if (!TAILQ_EMPTY(untagged_q))
1441                         /* if we're already executing an untagged command
1442                          * we're busy to another */
1443                         return SCSI_MLQUEUE_DEVICE_BUSY;
1444         }
1445
1446         nseg = scsi_dma_map(cmd);
1447         if (nseg < 0)
1448                 return SCSI_MLQUEUE_HOST_BUSY;
1449
1450         /*
1451          * Get an scb to use.
1452          */
1453         scb = ahc_get_scb(ahc);
1454         if (!scb) {
1455                 scsi_dma_unmap(cmd);
1456                 return SCSI_MLQUEUE_HOST_BUSY;
1457         }
1458
1459         scb->io_ctx = cmd;
1460         scb->platform_data->dev = dev;
1461         hscb = scb->hscb;
1462         cmd->host_scribble = (char *)scb;
1463
1464         /*
1465          * Fill out basics of the HSCB.
1466          */
1467         hscb->control = 0;
1468         hscb->scsiid = ahc_build_scsiid(ahc, cmd->device);
1469         hscb->lun = cmd->device->lun;
1470         mask = SCB_GET_TARGET_MASK(ahc, scb);
1471         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1472                                     SCB_GET_OUR_ID(scb),
1473                                     SCB_GET_TARGET(ahc, scb), &tstate);
1474         hscb->scsirate = tinfo->scsirate;
1475         hscb->scsioffset = tinfo->curr.offset;
1476         if ((tstate->ultraenb & mask) != 0)
1477                 hscb->control |= ULTRAENB;
1478
1479         if ((ahc->user_discenable & mask) != 0)
1480                 hscb->control |= DISCENB;
1481
1482         if ((tstate->auto_negotiate & mask) != 0) {
1483                 scb->flags |= SCB_AUTO_NEGOTIATE;
1484                 scb->hscb->control |= MK_MESSAGE;
1485         }
1486
1487         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1488                 if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1489                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1490                         hscb->control |= ORDERED_QUEUE_TAG;
1491                         dev->commands_since_idle_or_otag = 0;
1492                 } else {
1493                         hscb->control |= SIMPLE_QUEUE_TAG;
1494                 }
1495         }
1496
1497         hscb->cdb_len = cmd->cmd_len;
1498         if (hscb->cdb_len <= 12) {
1499                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1500         } else {
1501                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1502                 scb->flags |= SCB_CDB32_PTR;
1503         }
1504
1505         scb->platform_data->xfer_len = 0;
1506         ahc_set_residual(scb, 0);
1507         ahc_set_sense_residual(scb, 0);
1508         scb->sg_count = 0;
1509
1510         if (nseg > 0) {
1511                 struct  ahc_dma_seg *sg;
1512                 struct  scatterlist *cur_seg;
1513                 int i;
1514
1515                 /* Copy the segments into the SG list. */
1516                 sg = scb->sg_list;
1517                 /*
1518                  * The sg_count may be larger than nseg if
1519                  * a transfer crosses a 32bit page.
1520                  */
1521                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1522                         dma_addr_t addr;
1523                         bus_size_t len;
1524                         int consumed;
1525
1526                         addr = sg_dma_address(cur_seg);
1527                         len = sg_dma_len(cur_seg);
1528                         consumed = ahc_linux_map_seg(ahc, scb,
1529                                                      sg, addr, len);
1530                         sg += consumed;
1531                         scb->sg_count += consumed;
1532                 }
1533                 sg--;
1534                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1535
1536                 /*
1537                  * Reset the sg list pointer.
1538                  */
1539                 scb->hscb->sgptr =
1540                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1541
1542                 /*
1543                  * Copy the first SG into the "current"
1544                  * data pointer area.
1545                  */
1546                 scb->hscb->dataptr = scb->sg_list->addr;
1547                 scb->hscb->datacnt = scb->sg_list->len;
1548         } else {
1549                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1550                 scb->hscb->dataptr = 0;
1551                 scb->hscb->datacnt = 0;
1552                 scb->sg_count = 0;
1553         }
1554
1555         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1556         dev->openings--;
1557         dev->active++;
1558         dev->commands_issued++;
1559         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1560                 dev->commands_since_idle_or_otag++;
1561
1562         scb->flags |= SCB_ACTIVE;
1563         if (untagged_q) {
1564                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1565                 scb->flags |= SCB_UNTAGGEDQ;
1566         }
1567         ahc_queue_scb(ahc, scb);
1568         return 0;
1569 }
1570
1571 /*
1572  * SCSI controller interrupt handler.
1573  */
1574 irqreturn_t
1575 ahc_linux_isr(int irq, void *dev_id)
1576 {
1577         struct  ahc_softc *ahc;
1578         u_long  flags;
1579         int     ours;
1580
1581         ahc = (struct ahc_softc *) dev_id;
1582         ahc_lock(ahc, &flags);
1583         ours = ahc_intr(ahc);
1584         ahc_unlock(ahc, &flags);
1585         return IRQ_RETVAL(ours);
1586 }
1587
1588 void
1589 ahc_platform_flushwork(struct ahc_softc *ahc)
1590 {
1591
1592 }
1593
1594 void
1595 ahc_send_async(struct ahc_softc *ahc, char channel,
1596                u_int target, u_int lun, ac_code code)
1597 {
1598         switch (code) {
1599         case AC_TRANSFER_NEG:
1600         {
1601                 struct  scsi_target *starget;
1602                 struct  ahc_initiator_tinfo *tinfo;
1603                 struct  ahc_tmode_tstate *tstate;
1604                 int     target_offset;
1605                 unsigned int target_ppr_options;
1606
1607                 BUG_ON(target == CAM_TARGET_WILDCARD);
1608
1609                 tinfo = ahc_fetch_transinfo(ahc, channel,
1610                                                 channel == 'A' ? ahc->our_id
1611                                                                : ahc->our_id_b,
1612                                                 target, &tstate);
1613
1614                 /*
1615                  * Don't bother reporting results while
1616                  * negotiations are still pending.
1617                  */
1618                 if (tinfo->curr.period != tinfo->goal.period
1619                  || tinfo->curr.width != tinfo->goal.width
1620                  || tinfo->curr.offset != tinfo->goal.offset
1621                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1622                         if (bootverbose == 0)
1623                                 break;
1624
1625                 /*
1626                  * Don't bother reporting results that
1627                  * are identical to those last reported.
1628                  */
1629                 target_offset = target;
1630                 if (channel == 'B')
1631                         target_offset += 8;
1632                 starget = ahc->platform_data->starget[target_offset];
1633                 if (starget == NULL)
1634                         break;
1635
1636                 target_ppr_options =
1637                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1638                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1639                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1640
1641                 if (tinfo->curr.period == spi_period(starget)
1642                     && tinfo->curr.width == spi_width(starget)
1643                     && tinfo->curr.offset == spi_offset(starget)
1644                  && tinfo->curr.ppr_options == target_ppr_options)
1645                         if (bootverbose == 0)
1646                                 break;
1647
1648                 spi_period(starget) = tinfo->curr.period;
1649                 spi_width(starget) = tinfo->curr.width;
1650                 spi_offset(starget) = tinfo->curr.offset;
1651                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1652                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1653                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1654                 spi_display_xfer_agreement(starget);
1655                 break;
1656         }
1657         case AC_SENT_BDR:
1658         {
1659                 WARN_ON(lun != CAM_LUN_WILDCARD);
1660                 scsi_report_device_reset(ahc->platform_data->host,
1661                                          channel - 'A', target);
1662                 break;
1663         }
1664         case AC_BUS_RESET:
1665                 if (ahc->platform_data->host != NULL) {
1666                         scsi_report_bus_reset(ahc->platform_data->host,
1667                                               channel - 'A');
1668                 }
1669                 break;
1670         default:
1671                 panic("ahc_send_async: Unexpected async event");
1672         }
1673 }
1674
1675 /*
1676  * Calls the higher level scsi done function and frees the scb.
1677  */
1678 void
1679 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1680 {
1681         struct scsi_cmnd *cmd;
1682         struct     ahc_linux_device *dev;
1683
1684         LIST_REMOVE(scb, pending_links);
1685         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1686                 struct scb_tailq *untagged_q;
1687                 int target_offset;
1688
1689                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1690                 untagged_q = &(ahc->untagged_queues[target_offset]);
1691                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1692                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1693         } else if ((scb->flags & SCB_ACTIVE) == 0) {
1694                 /*
1695                  * Transactions aborted from the untagged queue may
1696                  * not have been dispatched to the controller, so
1697                  * only check the SCB_ACTIVE flag for tagged transactions.
1698                  */
1699                 printk("SCB %d done'd twice\n", scb->hscb->tag);
1700                 ahc_dump_card_state(ahc);
1701                 panic("Stopping for safety");
1702         }
1703         cmd = scb->io_ctx;
1704         dev = scb->platform_data->dev;
1705         dev->active--;
1706         dev->openings++;
1707         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1708                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1709                 dev->qfrozen--;
1710         }
1711         ahc_linux_unmap_scb(ahc, scb);
1712
1713         /*
1714          * Guard against stale sense data.
1715          * The Linux mid-layer assumes that sense
1716          * was retrieved anytime the first byte of
1717          * the sense buffer looks "sane".
1718          */
1719         cmd->sense_buffer[0] = 0;
1720         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1721 #ifdef AHC_REPORT_UNDERFLOWS
1722                 uint32_t amount_xferred;
1723
1724                 amount_xferred =
1725                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1726 #endif
1727                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1728 #ifdef AHC_DEBUG
1729                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1730                                 ahc_print_path(ahc, scb);
1731                                 printk("Set CAM_UNCOR_PARITY\n");
1732                         }
1733 #endif
1734                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1735 #ifdef AHC_REPORT_UNDERFLOWS
1736                 /*
1737                  * This code is disabled by default as some
1738                  * clients of the SCSI system do not properly
1739                  * initialize the underflow parameter.  This
1740                  * results in spurious termination of commands
1741                  * that complete as expected (e.g. underflow is
1742                  * allowed as command can return variable amounts
1743                  * of data.
1744                  */
1745                 } else if (amount_xferred < scb->io_ctx->underflow) {
1746                         u_int i;
1747
1748                         ahc_print_path(ahc, scb);
1749                         printk("CDB:");
1750                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1751                                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
1752                         printk("\n");
1753                         ahc_print_path(ahc, scb);
1754                         printk("Saw underflow (%ld of %ld bytes). "
1755                                "Treated as error\n",
1756                                 ahc_get_residual(scb),
1757                                 ahc_get_transfer_length(scb));
1758                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1759 #endif
1760                 } else {
1761                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1762                 }
1763         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1764                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1765         }
1766
1767         if (dev->openings == 1
1768          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1769          && ahc_get_scsi_status(scb) != SAM_STAT_TASK_SET_FULL)
1770                 dev->tag_success_count++;
1771         /*
1772          * Some devices deal with temporary internal resource
1773          * shortages by returning queue full.  When the queue
1774          * full occurrs, we throttle back.  Slowly try to get
1775          * back to our previous queue depth.
1776          */
1777         if ((dev->openings + dev->active) < dev->maxtags
1778          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1779                 dev->tag_success_count = 0;
1780                 dev->openings++;
1781         }
1782
1783         if (dev->active == 0)
1784                 dev->commands_since_idle_or_otag = 0;
1785
1786         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1787                 printk("Recovery SCB completes\n");
1788                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1789                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1790                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1791
1792                 if (ahc->platform_data->eh_done)
1793                         complete(ahc->platform_data->eh_done);
1794         }
1795
1796         ahc_free_scb(ahc, scb);
1797         ahc_linux_queue_cmd_complete(ahc, cmd);
1798 }
1799
1800 static void
1801 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1802                              struct scsi_device *sdev, struct scb *scb)
1803 {
1804         struct  ahc_devinfo devinfo;
1805         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1806
1807         ahc_compile_devinfo(&devinfo,
1808                             ahc->our_id,
1809                             sdev->sdev_target->id, sdev->lun,
1810                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1811                             ROLE_INITIATOR);
1812
1813         /*
1814          * We don't currently trust the mid-layer to
1815          * properly deal with queue full or busy.  So,
1816          * when one occurs, we tell the mid-layer to
1817          * unconditionally requeue the command to us
1818          * so that we can retry it ourselves.  We also
1819          * implement our own throttling mechanism so
1820          * we don't clobber the device with too many
1821          * commands.
1822          */
1823         switch (ahc_get_scsi_status(scb)) {
1824         default:
1825                 break;
1826         case SAM_STAT_CHECK_CONDITION:
1827         case SAM_STAT_COMMAND_TERMINATED:
1828         {
1829                 struct scsi_cmnd *cmd;
1830
1831                 /*
1832                  * Copy sense information to the OS's cmd
1833                  * structure if it is available.
1834                  */
1835                 cmd = scb->io_ctx;
1836                 if (scb->flags & SCB_SENSE) {
1837                         u_int sense_size;
1838
1839                         sense_size = min(sizeof(struct scsi_sense_data)
1840                                        - ahc_get_sense_residual(scb),
1841                                          (u_long)SCSI_SENSE_BUFFERSIZE);
1842                         memcpy(cmd->sense_buffer,
1843                                ahc_get_sense_buf(ahc, scb), sense_size);
1844                         if (sense_size < SCSI_SENSE_BUFFERSIZE)
1845                                 memset(&cmd->sense_buffer[sense_size], 0,
1846                                        SCSI_SENSE_BUFFERSIZE - sense_size);
1847 #ifdef AHC_DEBUG
1848                         if (ahc_debug & AHC_SHOW_SENSE) {
1849                                 int i;
1850
1851                                 printk("Copied %d bytes of sense data:",
1852                                        sense_size);
1853                                 for (i = 0; i < sense_size; i++) {
1854                                         if ((i & 0xF) == 0)
1855                                                 printk("\n");
1856                                         printk("0x%x ", cmd->sense_buffer[i]);
1857                                 }
1858                                 printk("\n");
1859                         }
1860 #endif
1861                 }
1862                 break;
1863         }
1864         case SAM_STAT_TASK_SET_FULL:
1865         {
1866                 /*
1867                  * By the time the core driver has returned this
1868                  * command, all other commands that were queued
1869                  * to us but not the device have been returned.
1870                  * This ensures that dev->active is equal to
1871                  * the number of commands actually queued to
1872                  * the device.
1873                  */
1874                 dev->tag_success_count = 0;
1875                 if (dev->active != 0) {
1876                         /*
1877                          * Drop our opening count to the number
1878                          * of commands currently outstanding.
1879                          */
1880                         dev->openings = 0;
1881 /*
1882                         ahc_print_path(ahc, scb);
1883                         printk("Dropping tag count to %d\n", dev->active);
1884  */
1885                         if (dev->active == dev->tags_on_last_queuefull) {
1886
1887                                 dev->last_queuefull_same_count++;
1888                                 /*
1889                                  * If we repeatedly see a queue full
1890                                  * at the same queue depth, this
1891                                  * device has a fixed number of tag
1892                                  * slots.  Lock in this tag depth
1893                                  * so we stop seeing queue fulls from
1894                                  * this device.
1895                                  */
1896                                 if (dev->last_queuefull_same_count
1897                                  == AHC_LOCK_TAGS_COUNT) {
1898                                         dev->maxtags = dev->active;
1899                                         ahc_print_path(ahc, scb);
1900                                         printk("Locking max tag count at %d\n",
1901                                                dev->active);
1902                                 }
1903                         } else {
1904                                 dev->tags_on_last_queuefull = dev->active;
1905                                 dev->last_queuefull_same_count = 0;
1906                         }
1907                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1908                         ahc_set_scsi_status(scb, SAM_STAT_GOOD);
1909                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1910                                      (dev->flags & AHC_DEV_Q_BASIC)
1911                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1912                         break;
1913                 }
1914                 /*
1915                  * Drop down to a single opening, and treat this
1916                  * as if the target returned BUSY SCSI status.
1917                  */
1918                 dev->openings = 1;
1919                 ahc_set_scsi_status(scb, SAM_STAT_BUSY);
1920                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1921                              (dev->flags & AHC_DEV_Q_BASIC)
1922                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1923                 break;
1924         }
1925         }
1926 }
1927
1928 static void
1929 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1930 {
1931         /*
1932          * Map CAM error codes into Linux Error codes.  We
1933          * avoid the conversion so that the DV code has the
1934          * full error information available when making
1935          * state change decisions.
1936          */
1937         {
1938                 u_int new_status;
1939
1940                 switch (ahc_cmd_get_transaction_status(cmd)) {
1941                 case CAM_REQ_INPROG:
1942                 case CAM_REQ_CMP:
1943                 case CAM_SCSI_STATUS_ERROR:
1944                         new_status = DID_OK;
1945                         break;
1946                 case CAM_REQ_ABORTED:
1947                         new_status = DID_ABORT;
1948                         break;
1949                 case CAM_BUSY:
1950                         new_status = DID_BUS_BUSY;
1951                         break;
1952                 case CAM_REQ_INVALID:
1953                 case CAM_PATH_INVALID:
1954                         new_status = DID_BAD_TARGET;
1955                         break;
1956                 case CAM_SEL_TIMEOUT:
1957                         new_status = DID_NO_CONNECT;
1958                         break;
1959                 case CAM_SCSI_BUS_RESET:
1960                 case CAM_BDR_SENT:
1961                         new_status = DID_RESET;
1962                         break;
1963                 case CAM_UNCOR_PARITY:
1964                         new_status = DID_PARITY;
1965                         break;
1966                 case CAM_CMD_TIMEOUT:
1967                         new_status = DID_TIME_OUT;
1968                         break;
1969                 case CAM_UA_ABORT:
1970                 case CAM_REQ_CMP_ERR:
1971                 case CAM_AUTOSENSE_FAIL:
1972                 case CAM_NO_HBA:
1973                 case CAM_DATA_RUN_ERR:
1974                 case CAM_UNEXP_BUSFREE:
1975                 case CAM_SEQUENCE_FAIL:
1976                 case CAM_CCB_LEN_ERR:
1977                 case CAM_PROVIDE_FAIL:
1978                 case CAM_REQ_TERMIO:
1979                 case CAM_UNREC_HBA_ERROR:
1980                 case CAM_REQ_TOO_BIG:
1981                         new_status = DID_ERROR;
1982                         break;
1983                 case CAM_REQUEUE_REQ:
1984                         new_status = DID_REQUEUE;
1985                         break;
1986                 default:
1987                         /* We should never get here */
1988                         new_status = DID_ERROR;
1989                         break;
1990                 }
1991
1992                 ahc_cmd_set_transaction_status(cmd, new_status);
1993         }
1994
1995         scsi_done(cmd);
1996 }
1997
1998 static void
1999 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2000 {
2001         unsigned long s;
2002
2003         ahc_lock(ahc, &s);
2004         ahc->platform_data->qfrozen++;
2005         if (ahc->platform_data->qfrozen == 1) {
2006                 scsi_block_requests(ahc->platform_data->host);
2007
2008                 /* XXX What about Twin channels? */
2009                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2010                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2011                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2012         }
2013         ahc_unlock(ahc, &s);
2014 }
2015
2016 static void
2017 ahc_linux_release_simq(struct ahc_softc *ahc)
2018 {
2019         u_long s;
2020         int    unblock_reqs;
2021
2022         unblock_reqs = 0;
2023         ahc_lock(ahc, &s);
2024         if (ahc->platform_data->qfrozen > 0)
2025                 ahc->platform_data->qfrozen--;
2026         if (ahc->platform_data->qfrozen == 0)
2027                 unblock_reqs = 1;
2028         ahc_unlock(ahc, &s);
2029         /*
2030          * There is still a race here.  The mid-layer
2031          * should keep its own freeze count and use
2032          * a bottom half handler to run the queues
2033          * so we can unblock with our own lock held.
2034          */
2035         if (unblock_reqs)
2036                 scsi_unblock_requests(ahc->platform_data->host);
2037 }
2038
2039 static int
2040 ahc_linux_queue_recovery_cmd(struct scsi_device *sdev,
2041                              struct scsi_cmnd *cmd)
2042 {
2043         struct ahc_softc *ahc;
2044         struct ahc_linux_device *dev;
2045         struct scb *pending_scb = NULL, *scb;
2046         u_int  saved_scbptr;
2047         u_int  active_scb_index;
2048         u_int  last_phase;
2049         u_int  saved_scsiid;
2050         u_int  cdb_byte;
2051         int    retval;
2052         int    was_paused;
2053         int    paused;
2054         int    wait;
2055         int    disconnected;
2056         unsigned long flags;
2057
2058         paused = FALSE;
2059         wait = FALSE;
2060         ahc = *(struct ahc_softc **)sdev->host->hostdata;
2061
2062         sdev_printk(KERN_INFO, sdev, "Attempting to queue a%s message\n",
2063                cmd ? "n ABORT" : " TARGET RESET");
2064
2065         if (cmd) {
2066                 printk("CDB:");
2067                 for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2068                         printk(" 0x%x", cmd->cmnd[cdb_byte]);
2069                 printk("\n");
2070         }
2071
2072         ahc_lock(ahc, &flags);
2073
2074         /*
2075          * First determine if we currently own this command.
2076          * Start by searching the device queue.  If not found
2077          * there, check the pending_scb list.  If not found
2078          * at all, and the system wanted us to just abort the
2079          * command, return success.
2080          */
2081         dev = scsi_transport_device_data(sdev);
2082
2083         if (dev == NULL) {
2084                 /*
2085                  * No target device for this command exists,
2086                  * so we must not still own the command.
2087                  */
2088                 printk("%s:%d:%d:%d: Is not an active device\n",
2089                        ahc_name(ahc), sdev->channel, sdev->id, (u8)sdev->lun);
2090                 retval = SUCCESS;
2091                 goto no_cmd;
2092         }
2093
2094         if (cmd && (dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2095          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2096                                        cmd->device->channel + 'A',
2097                                        (u8)cmd->device->lun,
2098                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2099                 printk("%s:%d:%d:%d: Command found on untagged queue\n",
2100                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2101                        (u8)cmd->device->lun);
2102                 retval = SUCCESS;
2103                 goto done;
2104         }
2105
2106         /*
2107          * See if we can find a matching cmd in the pending list.
2108          */
2109         if (cmd) {
2110                 LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) {
2111                         if (scb->io_ctx == cmd) {
2112                                 pending_scb = scb;
2113                                 break;
2114                         }
2115                 }
2116         } else {
2117                 /* Any SCB for this device will do for a target reset */
2118                 LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) {
2119                         if (ahc_match_scb(ahc, scb, sdev->id,
2120                                           sdev->channel + 'A',
2121                                           CAM_LUN_WILDCARD,
2122                                           SCB_LIST_NULL, ROLE_INITIATOR)) {
2123                                 pending_scb = scb;
2124                                 break;
2125                         }
2126                 }
2127         }
2128
2129         if (pending_scb == NULL) {
2130                 sdev_printk(KERN_INFO, sdev, "Command not found\n");
2131                 goto no_cmd;
2132         }
2133
2134         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2135                 /*
2136                  * We can't queue two recovery actions using the same SCB
2137                  */
2138                 retval = FAILED;
2139                 goto  done;
2140         }
2141
2142         /*
2143          * Ensure that the card doesn't do anything
2144          * behind our back and that we didn't "just" miss
2145          * an interrupt that would affect this cmd.
2146          */
2147         was_paused = ahc_is_paused(ahc);
2148         ahc_pause_and_flushwork(ahc);
2149         paused = TRUE;
2150
2151         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2152                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2153                 goto no_cmd;
2154         }
2155
2156         printk("%s: At time of recovery, card was %spaused\n",
2157                ahc_name(ahc), was_paused ? "" : "not ");
2158         ahc_dump_card_state(ahc);
2159
2160         disconnected = TRUE;
2161         if (cmd) {
2162                 if (ahc_search_qinfifo(ahc, sdev->id,
2163                                        sdev->channel + 'A',
2164                                        sdev->lun,
2165                                        pending_scb->hscb->tag,
2166                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2167                                        SEARCH_COMPLETE) > 0) {
2168                         printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2169                                ahc_name(ahc), sdev->channel,
2170                                sdev->id, (u8)sdev->lun);
2171                         retval = SUCCESS;
2172                         goto done;
2173                 }
2174         } else if (ahc_search_qinfifo(ahc, sdev->id,
2175                                       sdev->channel + 'A',
2176                                       sdev->lun,
2177                                       pending_scb->hscb->tag,
2178                                       ROLE_INITIATOR, /*status*/0,
2179                                       SEARCH_COUNT) > 0) {
2180                 disconnected = FALSE;
2181         }
2182
2183         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2184                 struct scb *bus_scb;
2185
2186                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2187                 if (bus_scb == pending_scb)
2188                         disconnected = FALSE;
2189                 else if (!cmd
2190                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2191                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2192                         disconnected = FALSE;
2193         }
2194
2195         /*
2196          * At this point, pending_scb is the scb associated with the
2197          * passed in command.  That command is currently active on the
2198          * bus, is in the disconnected state, or we're hoping to find
2199          * a command for the same target active on the bus to abuse to
2200          * send a BDR.  Queue the appropriate message based on which of
2201          * these states we are in.
2202          */
2203         last_phase = ahc_inb(ahc, LASTPHASE);
2204         saved_scbptr = ahc_inb(ahc, SCBPTR);
2205         active_scb_index = ahc_inb(ahc, SCB_TAG);
2206         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2207         if (last_phase != P_BUSFREE
2208          && (pending_scb->hscb->tag == active_scb_index
2209           || (!cmd && SCSIID_TARGET(ahc, saved_scsiid) == sdev->id))) {
2210
2211                 /*
2212                  * We're active on the bus, so assert ATN
2213                  * and hope that the target responds.
2214                  */
2215                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2216                 pending_scb->flags |= SCB_RECOVERY_SCB;
2217                 pending_scb->flags |= cmd ? SCB_ABORT : SCB_DEVICE_RESET;
2218                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2219                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2220                 sdev_printk(KERN_INFO, sdev, "Device is active, asserting ATN\n");
2221                 wait = TRUE;
2222         } else if (disconnected) {
2223
2224                 /*
2225                  * Actually re-queue this SCB in an attempt
2226                  * to select the device before it reconnects.
2227                  * In either case (selection or reselection),
2228                  * we will now issue the approprate message
2229                  * to the timed-out device.
2230                  *
2231                  * Set the MK_MESSAGE control bit indicating
2232                  * that we desire to send a message.  We
2233                  * also set the disconnected flag since
2234                  * in the paging case there is no guarantee
2235                  * that our SCB control byte matches the
2236                  * version on the card.  We don't want the
2237                  * sequencer to abort the command thinking
2238                  * an unsolicited reselection occurred.
2239                  */
2240                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2241                 pending_scb->flags |= SCB_RECOVERY_SCB;
2242                 pending_scb->flags |= cmd ? SCB_ABORT : SCB_DEVICE_RESET;
2243
2244                 /*
2245                  * Remove any cached copy of this SCB in the
2246                  * disconnected list in preparation for the
2247                  * queuing of our abort SCB.  We use the
2248                  * same element in the SCB, SCB_NEXT, for
2249                  * both the qinfifo and the disconnected list.
2250                  */
2251                 ahc_search_disc_list(ahc, sdev->id,
2252                                      sdev->channel + 'A',
2253                                      sdev->lun, pending_scb->hscb->tag,
2254                                      /*stop_on_first*/TRUE,
2255                                      /*remove*/TRUE,
2256                                      /*save_state*/FALSE);
2257
2258                 /*
2259                  * In the non-paging case, the sequencer will
2260                  * never re-reference the in-core SCB.
2261                  * To make sure we are notified during
2262                  * reselection, set the MK_MESSAGE flag in
2263                  * the card's copy of the SCB.
2264                  */
2265                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2266                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2267                         ahc_outb(ahc, SCB_CONTROL,
2268                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2269                 }
2270
2271                 /*
2272                  * Clear out any entries in the QINFIFO first
2273                  * so we are the next SCB for this target
2274                  * to run.
2275                  */
2276                 ahc_search_qinfifo(ahc, sdev->id,
2277                                    sdev->channel + 'A',
2278                                    (u8)sdev->lun, SCB_LIST_NULL,
2279                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2280                                    SEARCH_COMPLETE);
2281                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2282                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2283                 ahc_print_path(ahc, pending_scb);
2284                 printk("Device is disconnected, re-queuing SCB\n");
2285                 wait = TRUE;
2286         } else {
2287                 sdev_printk(KERN_INFO, sdev, "Unable to deliver message\n");
2288                 retval = FAILED;
2289                 goto done;
2290         }
2291
2292 no_cmd:
2293         /*
2294          * Our assumption is that if we don't have the command, no
2295          * recovery action was required, so we return success.  Again,
2296          * the semantics of the mid-layer recovery engine are not
2297          * well defined, so this may change in time.
2298          */
2299         retval = SUCCESS;
2300 done:
2301         if (paused)
2302                 ahc_unpause(ahc);
2303         if (wait) {
2304                 DECLARE_COMPLETION_ONSTACK(done);
2305
2306                 ahc->platform_data->eh_done = &done;
2307                 ahc_unlock(ahc, &flags);
2308
2309                 printk("Recovery code sleeping\n");
2310                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2311                         ahc_lock(ahc, &flags);
2312                         ahc->platform_data->eh_done = NULL;
2313                         ahc_unlock(ahc, &flags);
2314
2315                         printk("Timer Expired\n");
2316                         retval = FAILED;
2317                 }
2318                 printk("Recovery code awake\n");
2319         } else
2320                 ahc_unlock(ahc, &flags);
2321         return (retval);
2322 }
2323
2324 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2325 {
2326         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2327         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2328         struct ahc_devinfo devinfo;
2329         unsigned long flags;
2330
2331         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2332                             starget->channel + 'A', ROLE_INITIATOR);
2333         ahc_lock(ahc, &flags);
2334         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2335         ahc_unlock(ahc, &flags);
2336 }
2337
2338 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2339 {
2340         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2341         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2342         struct ahc_tmode_tstate *tstate;
2343         struct ahc_initiator_tinfo *tinfo
2344                 = ahc_fetch_transinfo(ahc,
2345                                       starget->channel + 'A',
2346                                       shost->this_id, starget->id, &tstate);
2347         struct ahc_devinfo devinfo;
2348         unsigned int ppr_options = tinfo->goal.ppr_options;
2349         unsigned long flags;
2350         unsigned long offset = tinfo->goal.offset;
2351         const struct ahc_syncrate *syncrate;
2352
2353         if (offset == 0)
2354                 offset = MAX_OFFSET;
2355
2356         if (period < 9)
2357                 period = 9;     /* 12.5ns is our minimum */
2358         if (period == 9) {
2359                 if (spi_max_width(starget))
2360                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2361                 else
2362                         /* need wide for DT and need DT for 12.5 ns */
2363                         period = 10;
2364         }
2365
2366         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2367                             starget->channel + 'A', ROLE_INITIATOR);
2368
2369         /* all PPR requests apart from QAS require wide transfers */
2370         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2371                 if (spi_width(starget) == 0)
2372                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2373         }
2374
2375         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2376                                      AHC_SYNCRATE_DT);
2377         ahc_lock(ahc, &flags);
2378         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2379                          ppr_options, AHC_TRANS_GOAL, FALSE);
2380         ahc_unlock(ahc, &flags);
2381 }
2382
2383 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2384 {
2385         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2386         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2387         struct ahc_tmode_tstate *tstate;
2388         struct ahc_initiator_tinfo *tinfo
2389                 = ahc_fetch_transinfo(ahc,
2390                                       starget->channel + 'A',
2391                                       shost->this_id, starget->id, &tstate);
2392         struct ahc_devinfo devinfo;
2393         unsigned int ppr_options = 0;
2394         unsigned int period = 0;
2395         unsigned long flags;
2396         const struct ahc_syncrate *syncrate = NULL;
2397
2398         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2399                             starget->channel + 'A', ROLE_INITIATOR);
2400         if (offset != 0) {
2401                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2402                                              AHC_SYNCRATE_DT);
2403                 period = tinfo->goal.period;
2404                 ppr_options = tinfo->goal.ppr_options;
2405         }
2406         ahc_lock(ahc, &flags);
2407         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2408                          ppr_options, AHC_TRANS_GOAL, FALSE);
2409         ahc_unlock(ahc, &flags);
2410 }
2411
2412 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2413 {
2414         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2415         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2416         struct ahc_tmode_tstate *tstate;
2417         struct ahc_initiator_tinfo *tinfo
2418                 = ahc_fetch_transinfo(ahc,
2419                                       starget->channel + 'A',
2420                                       shost->this_id, starget->id, &tstate);
2421         struct ahc_devinfo devinfo;
2422         unsigned int ppr_options = tinfo->goal.ppr_options
2423                 & ~MSG_EXT_PPR_DT_REQ;
2424         unsigned int period = tinfo->goal.period;
2425         unsigned int width = tinfo->goal.width;
2426         unsigned long flags;
2427         const struct ahc_syncrate *syncrate;
2428
2429         if (dt && spi_max_width(starget)) {
2430                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2431                 if (!width)
2432                         ahc_linux_set_width(starget, 1);
2433         } else if (period == 9)
2434                 period = 10;    /* if resetting DT, period must be >= 25ns */
2435
2436         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2437                             starget->channel + 'A', ROLE_INITIATOR);
2438         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2439                                      AHC_SYNCRATE_DT);
2440         ahc_lock(ahc, &flags);
2441         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2442                          ppr_options, AHC_TRANS_GOAL, FALSE);
2443         ahc_unlock(ahc, &flags);
2444 }
2445
2446 #if 0
2447 /* FIXME: This code claims to support IU and QAS.  However, the actual
2448  * sequencer code and aic7xxx_core have no support for these parameters and
2449  * will get into a bad state if they're negotiated.  Do not enable this
2450  * unless you know what you're doing */
2451 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2452 {
2453         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2454         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2455         struct ahc_tmode_tstate *tstate;
2456         struct ahc_initiator_tinfo *tinfo
2457                 = ahc_fetch_transinfo(ahc,
2458                                       starget->channel + 'A',
2459                                       shost->this_id, starget->id, &tstate);
2460         struct ahc_devinfo devinfo;
2461         unsigned int ppr_options = tinfo->goal.ppr_options
2462                 & ~MSG_EXT_PPR_QAS_REQ;
2463         unsigned int period = tinfo->goal.period;
2464         unsigned long flags;
2465         struct ahc_syncrate *syncrate;
2466
2467         if (qas)
2468                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
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,
2473                                      AHC_SYNCRATE_DT);
2474         ahc_lock(ahc, &flags);
2475         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2476                          ppr_options, AHC_TRANS_GOAL, FALSE);
2477         ahc_unlock(ahc, &flags);
2478 }
2479
2480 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2481 {
2482         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2483         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2484         struct ahc_tmode_tstate *tstate;
2485         struct ahc_initiator_tinfo *tinfo
2486                 = ahc_fetch_transinfo(ahc,
2487                                       starget->channel + 'A',
2488                                       shost->this_id, starget->id, &tstate);
2489         struct ahc_devinfo devinfo;
2490         unsigned int ppr_options = tinfo->goal.ppr_options
2491                 & ~MSG_EXT_PPR_IU_REQ;
2492         unsigned int period = tinfo->goal.period;
2493         unsigned long flags;
2494         struct ahc_syncrate *syncrate;
2495
2496         if (iu)
2497                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2498
2499         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2500                             starget->channel + 'A', ROLE_INITIATOR);
2501         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2502                                      AHC_SYNCRATE_DT);
2503         ahc_lock(ahc, &flags);
2504         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2505                          ppr_options, AHC_TRANS_GOAL, FALSE);
2506         ahc_unlock(ahc, &flags);
2507 }
2508 #endif
2509
2510 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2511 {
2512         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2513         unsigned long flags;
2514         u8 mode;
2515
2516         if (!(ahc->features & AHC_ULTRA2)) {
2517                 /* non-LVD chipset, may not have SBLKCTL reg */
2518                 spi_signalling(shost) =
2519                         ahc->features & AHC_HVD ?
2520                         SPI_SIGNAL_HVD :
2521                         SPI_SIGNAL_SE;
2522                 return;
2523         }
2524
2525         ahc_lock(ahc, &flags);
2526         ahc_pause(ahc);
2527         mode = ahc_inb(ahc, SBLKCTL);
2528         ahc_unpause(ahc);
2529         ahc_unlock(ahc, &flags);
2530
2531         if (mode & ENAB40)
2532                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2533         else if (mode & ENAB20)
2534                 spi_signalling(shost) = SPI_SIGNAL_SE;
2535         else
2536                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2537 }
2538
2539 static struct spi_function_template ahc_linux_transport_functions = {
2540         .set_offset     = ahc_linux_set_offset,
2541         .show_offset    = 1,
2542         .set_period     = ahc_linux_set_period,
2543         .show_period    = 1,
2544         .set_width      = ahc_linux_set_width,
2545         .show_width     = 1,
2546         .set_dt         = ahc_linux_set_dt,
2547         .show_dt        = 1,
2548 #if 0
2549         .set_iu         = ahc_linux_set_iu,
2550         .show_iu        = 1,
2551         .set_qas        = ahc_linux_set_qas,
2552         .show_qas       = 1,
2553 #endif
2554         .get_signalling = ahc_linux_get_signalling,
2555 };
2556
2557
2558
2559 static int __init
2560 ahc_linux_init(void)
2561 {
2562         /*
2563          * If we've been passed any parameters, process them now.
2564          */
2565         if (aic7xxx)
2566                 aic7xxx_setup(aic7xxx);
2567
2568         ahc_linux_transport_template =
2569                 spi_attach_transport(&ahc_linux_transport_functions);
2570         if (!ahc_linux_transport_template)
2571                 return -ENODEV;
2572
2573         scsi_transport_reserve_device(ahc_linux_transport_template,
2574                                       sizeof(struct ahc_linux_device));
2575
2576         ahc_linux_pci_init();
2577         ahc_linux_eisa_init();
2578         return 0;
2579 }
2580
2581 static void
2582 ahc_linux_exit(void)
2583 {
2584         ahc_linux_pci_exit();
2585         ahc_linux_eisa_exit();
2586         spi_release_transport(ahc_linux_transport_template);
2587 }
2588
2589 module_init(ahc_linux_init);
2590 module_exit(ahc_linux_exit);