drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132 #include <linux/slab.h>
 133
 134
 135 /*
 136  * Set this to the delay in seconds after SCSI bus reset.
 137  * Note, we honor this only for the initial bus reset.
 138  * The scsi error recovery code performs its own bus settle
 139  * delay handling for error recovery actions.
 140  */
 141 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 143 #else
 144 #define AIC7XXX_RESET_DELAY 5000
 145 #endif
 146
 147 /*
 148  * To change the default number of tagged transactions allowed per-device,
 149  * add a line to the lilo.conf file like:
 150  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 151  * which will result in the first four devices on the first two
 152  * controllers being set to a tagged queue depth of 32.
 153  *
 154  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 155  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 156  * for channel 1.
 157  */
 158 typedef struct {
 159         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 160 } adapter_tag_info_t;
 161
 162 /*
 163  * Modify this as you see fit for your system.
 164  *
 165  * 0                    tagged queuing disabled
 166  * 1 <= n <= 253        n == max tags ever dispatched.
 167  *
 168  * The driver will throttle the number of commands dispatched to a
 169  * device if it returns queue full.  For devices with a fixed maximum
 170  * queue depth, the driver will eventually determine this depth and
 171  * lock it in (a console message is printed to indicate that a lock
 172  * has occurred).  On some devices, queue full is returned for a temporary
 173  * resource shortage.  These devices will return queue full at varying
 174  * depths.  The driver will throttle back when the queue fulls occur and
 175  * attempt to slowly increase the depth over time as the device recovers
 176  * from the resource shortage.
 177  *
 178  * In this example, the first line will disable tagged queueing for all
 179  * the devices on the first probed aic7xxx adapter.
 180  *
 181  * The second line enables tagged queueing with 4 commands/LUN for IDs
 182  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 183  * driver to attempt to use up to 64 tags for ID 1.
 184  *
 185  * The third line is the same as the first line.
 186  *
 187  * The fourth line disables tagged queueing for devices 0 and 3.  It
 188  * enables tagged queueing for the other IDs, with 16 commands/LUN
 189  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 190  * IDs 2, 5-7, and 9-15.
 191  */
 192
 193 /*
 194  * NOTE: The below structure is for reference only, the actual structure
 195  *       to modify in order to change things is just below this comment block.
 196 adapter_tag_info_t aic7xxx_tag_info[] =
 197 {
 198         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 199         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 200         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 201         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 202 };
 203 */
 204
 205 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 206 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 207 #else
 208 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 209 #endif
 210
 211 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 212         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 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 }
 221
 222 /*
 223  * By default, use the number of commands specified by
 224  * the users kernel configuration.
 225  */
 226 static adapter_tag_info_t aic7xxx_tag_info[] =
 227 {
 228         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 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 };
 245
 246 /*
 247  * There should be a specific return value for this in scsi.h, but
 248  * it seems that most drivers ignore it.
 249  */
 250 #define DID_UNDERFLOW   DID_ERROR
 251
 252 void
 253 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 254 {
 255         printk("(scsi%d:%c:%d:%d): ",
 256                ahc->platform_data->host->host_no,
 257                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 258                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 259                scb != NULL ? SCB_GET_LUN(scb) : -1);
 260 }
 261
 262 /*
 263  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 264  *       cards in the system.  This should be fixed.  Exceptions to this
 265  *       rule are noted in the comments.
 266  */
 267
 268 /*
 269  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 270  * has no effect on any later resets that might occur due to things like
 271  * SCSI bus timeouts.
 272  */
 273 static uint32_t aic7xxx_no_reset;
 274
 275 /*
 276  * Should we force EXTENDED translation on a controller.
 277  *     0 == Use whatever is in the SEEPROM or default to off
 278  *     1 == Use whatever is in the SEEPROM or default to on
 279  */
 280 static uint32_t aic7xxx_extended;
 281
 282 /*
 283  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 284  * dubious at best.  To my knowledge, this option has never actually
 285  * solved a PCI parity problem, but on certain machines with broken PCI
 286  * chipset configurations where stray PCI transactions with bad parity are
 287  * the norm rather than the exception, the error messages can be overwhelming.
 288  * It's included in the driver for completeness.
 289  *   0     = Shut off PCI parity check
 290  *   non-0 = reverse polarity pci parity checking
 291  */
 292 static uint32_t aic7xxx_pci_parity = ~0;
 293
 294 /*
 295  * There are lots of broken chipsets in the world.  Some of them will
 296  * violate the PCI spec when we issue byte sized memory writes to our
 297  * controller.  I/O mapped register access, if allowed by the given
 298  * platform, will work in almost all cases.
 299  */
 300 uint32_t aic7xxx_allow_memio = ~0;
 301
 302 /*
 303  * So that we can set how long each device is given as a selection timeout.
 304  * The table of values goes like this:
 305  *   0 - 256ms
 306  *   1 - 128ms
 307  *   2 - 64ms
 308  *   3 - 32ms
 309  * We default to 256ms because some older devices need a longer time
 310  * to respond to initial selection.
 311  */
 312 static uint32_t aic7xxx_seltime;
 313
 314 /*
 315  * Certain devices do not perform any aging on commands.  Should the
 316  * device be saturated by commands in one portion of the disk, it is
 317  * possible for transactions on far away sectors to never be serviced.
 318  * To handle these devices, we can periodically send an ordered tag to
 319  * force all outstanding transactions to be serviced prior to a new
 320  * transaction.
 321  */
 322 static uint32_t aic7xxx_periodic_otag;
 323
 324 /*
 325  * Module information and settable options.
 326  */
 327 static char *aic7xxx = NULL;
 328
 329 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 330 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
 331 MODULE_LICENSE("Dual BSD/GPL");
 332 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 333 module_param(aic7xxx, charp, 0444);
 334 MODULE_PARM_DESC(aic7xxx,
 335 "period-delimited options string:\n"
 336 "       verbose                 Enable verbose/diagnostic logging\n"
 337 "       allow_memio             Allow device registers to be memory mapped\n"
 338 "       debug                   Bitmask of debug values to enable\n"
 339 "       no_probe                Toggle EISA/VLB controller probing\n"
 340 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 341 "       no_reset                Suppress initial bus resets\n"
 342 "       extended                Enable extended geometry on all controllers\n"
 343 "       periodic_otag           Send an ordered tagged transaction\n"
 344 "                               periodically to prevent tag starvation.\n"
 345 "                               This may be required by some older disk\n"
 346 "                               drives or RAID arrays.\n"
 347 "       tag_info:<tag_str>      Set per-target tag depth\n"
 348 "       global_tag_depth:<int>  Global tag depth for every target\n"
 349 "                               on every bus\n"
 350 "       seltime:<int>           Selection Timeout\n"
 351 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 352 "\n"
 353 "       Sample modprobe configuration file:\n"
 354 "       #       Toggle EISA/VLB probing\n"
 355 "       #       Set tag depth on Controller 1/Target 1 to 10 tags\n"
 356 "       #       Shorten the selection timeout to 128ms\n"
 357 "\n"
 358 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 359 );
 360
 361 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 362                                          struct scsi_device *,
 363                                          struct scb *);
 364 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 365                                          struct scsi_cmnd *cmd);
 366 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 367 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 368 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 369 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 370 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 371                                      struct ahc_devinfo *devinfo);
 372 static void ahc_linux_device_queue_depth(struct scsi_device *);
 373 static int ahc_linux_run_command(struct ahc_softc*,
 374                                  struct ahc_linux_device *,
 375                                  struct scsi_cmnd *);
 376 static void ahc_linux_setup_tag_info_global(char *p);
 377 static int  aic7xxx_setup(char *s);
 378
 379 static int ahc_linux_unit;
 380
 381
 382 /************************** OS Utility Wrappers *******************************/
 383 void
 384 ahc_delay(long usec)
 385 {
 386         /*
 387          * udelay on Linux can have problems for
 388          * multi-millisecond waits.  Wait at most
 389          * 1024us per call.
 390          */
 391         while (usec > 0) {
 392                 udelay(usec % 1024);
 393                 usec -= 1024;
 394         }
 395 }
 396
 397 /***************************** Low Level I/O **********************************/
 398 uint8_t
 399 ahc_inb(struct ahc_softc * ahc, long port)
 400 {
 401         uint8_t x;
 402
 403         if (ahc->tag == BUS_SPACE_MEMIO) {
 404                 x = readb(ahc->bsh.maddr + port);
 405         } else {
 406                 x = inb(ahc->bsh.ioport + port);
 407         }
 408         mb();
 409         return (x);
 410 }
 411
 412 void
 413 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
 414 {
 415         if (ahc->tag == BUS_SPACE_MEMIO) {
 416                 writeb(val, ahc->bsh.maddr + port);
 417         } else {
 418                 outb(val, ahc->bsh.ioport + port);
 419         }
 420         mb();
 421 }
 422
 423 void
 424 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 425 {
 426         int i;
 427
 428         /*
 429          * There is probably a more efficient way to do this on Linux
 430          * but we don't use this for anything speed critical and this
 431          * should work.
 432          */
 433         for (i = 0; i < count; i++)
 434                 ahc_outb(ahc, port, *array++);
 435 }
 436
 437 void
 438 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 439 {
 440         int i;
 441
 442         /*
 443          * There is probably a more efficient way to do this on Linux
 444          * but we don't use this for anything speed critical and this
 445          * should work.
 446          */
 447         for (i = 0; i < count; i++)
 448                 *array++ = ahc_inb(ahc, port);
 449 }
 450
 451 /********************************* Inlines ************************************/
 452 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 453
 454 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 455                                       struct ahc_dma_seg *sg,
 456                                       dma_addr_t addr, bus_size_t len);
 457
 458 static void
 459 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 460 {
 461         struct scsi_cmnd *cmd;
 462
 463         cmd = scb->io_ctx;
 464         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 465
 466         scsi_dma_unmap(cmd);
 467 }
 468
 469 static int
 470 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 471                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 472 {
 473         int      consumed;
 474
 475         if ((scb->sg_count + 1) > AHC_NSEG)
 476                 panic("Too few segs for dma mapping.  "
 477                       "Increase AHC_NSEG\n");
 478
 479         consumed = 1;
 480         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 481         scb->platform_data->xfer_len += len;
 482
 483         if (sizeof(dma_addr_t) > 4
 484          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 485                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 486
 487         sg->len = ahc_htole32(len);
 488         return (consumed);
 489 }
 490
 491 /*
 492  * Return a string describing the driver.
 493  */
 494 static const char *
 495 ahc_linux_info(struct Scsi_Host *host)
 496 {
 497         static char buffer[512];
 498         char    ahc_info[256];
 499         char   *bp;
 500         struct ahc_softc *ahc;
 501
 502         bp = &buffer[0];
 503         ahc = *(struct ahc_softc **)host->hostdata;
 504         memset(bp, 0, sizeof(buffer));
 505         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
 506                         "        <");
 507         strcat(bp, ahc->description);
 508         strcat(bp, ">\n"
 509                         "        ");
 510         ahc_controller_info(ahc, ahc_info);
 511         strcat(bp, ahc_info);
 512         strcat(bp, "\n");
 513
 514         return (bp);
 515 }
 516
 517 /*
 518  * Queue an SCB to the controller.
 519  */
 520 static int
 521 ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 522 {
 523         struct   ahc_softc *ahc;
 524         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 525         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 526         unsigned long flags;
 527
 528         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 529
 530         ahc_lock(ahc, &flags);
 531         if (ahc->platform_data->qfrozen == 0) {
 532                 cmd->scsi_done = scsi_done;
 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, SCB_ABORT);
 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, SCB_DEVICE_RESET);
 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 /******************************** Macros **************************************/
 803 #define BUILD_SCSIID(ahc, cmd)                                              \
 804         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 805         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 806         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 807
 808 /******************************** Bus DMA *************************************/
 809 int
 810 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 811                    bus_size_t alignment, bus_size_t boundary,
 812                    dma_addr_t lowaddr, dma_addr_t highaddr,
 813                    bus_dma_filter_t *filter, void *filterarg,
 814                    bus_size_t maxsize, int nsegments,
 815                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 816 {
 817         bus_dma_tag_t dmat;
 818
 819         dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
 820         if (dmat == NULL)
 821                 return (ENOMEM);
 822
 823         /*
 824          * Linux is very simplistic about DMA memory.  For now don't
 825          * maintain all specification information.  Once Linux supplies
 826          * better facilities for doing these operations, or the
 827          * needs of this particular driver change, we might need to do
 828          * more here.
 829          */
 830         dmat->alignment = alignment;
 831         dmat->boundary = boundary;
 832         dmat->maxsize = maxsize;
 833         *ret_tag = dmat;
 834         return (0);
 835 }
 836
 837 void
 838 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 839 {
 840         kfree(dmat);
 841 }
 842
 843 int
 844 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 845                  int flags, bus_dmamap_t *mapp)
 846 {
 847         /* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
 848         *vaddr = dma_alloc_coherent(ahc->dev, dmat->maxsize, mapp, GFP_ATOMIC);
 849         if (*vaddr == NULL)
 850                 return ENOMEM;
 851         return 0;
 852 }
 853
 854 void
 855 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 856                 void* vaddr, bus_dmamap_t map)
 857 {
 858         dma_free_coherent(ahc->dev, dmat->maxsize, vaddr, map);
 859 }
 860
 861 int
 862 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 863                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 864                 void *cb_arg, int flags)
 865 {
 866         /*
 867          * Assume for now that this will only be used during
 868          * initialization and not for per-transaction buffer mapping.
 869          */
 870         bus_dma_segment_t stack_sg;
 871
 872         stack_sg.ds_addr = map;
 873         stack_sg.ds_len = dmat->maxsize;
 874         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 875         return (0);
 876 }
 877
 878 void
 879 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 880 {
 881 }
 882
 883 int
 884 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 885 {
 886         /* Nothing to do */
 887         return (0);
 888 }
 889
 890 static void
 891 ahc_linux_setup_tag_info_global(char *p)
 892 {
 893         int tags, i, j;
 894
 895         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 896         printk("Setting Global Tags= %d\n", tags);
 897
 898         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 899                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 900                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 901                 }
 902         }
 903 }
 904
 905 static void
 906 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 907 {
 908
 909         if ((instance >= 0) && (targ >= 0)
 910          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 911          && (targ < AHC_NUM_TARGETS)) {
 912                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 913                 if (bootverbose)
 914                         printk("tag_info[%d:%d] = %d\n", instance, targ, value);
 915         }
 916 }
 917
 918 static char *
 919 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 920                        void (*callback)(u_long, int, int, int32_t),
 921                        u_long callback_arg)
 922 {
 923         char    *tok_end;
 924         char    *tok_end2;
 925         int      i;
 926         int      instance;
 927         int      targ;
 928         int      done;
 929         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 930
 931         /* All options use a ':' name/arg separator */
 932         if (*opt_arg != ':')
 933                 return (opt_arg);
 934         opt_arg++;
 935         instance = -1;
 936         targ = -1;
 937         done = FALSE;
 938         /*
 939          * Restore separator that may be in
 940          * the middle of our option argument.
 941          */
 942         tok_end = strchr(opt_arg, '\0');
 943         if (tok_end < end)
 944                 *tok_end = ',';
 945         while (!done) {
 946                 switch (*opt_arg) {
 947                 case '{':
 948                         if (instance == -1) {
 949                                 instance = 0;
 950                         } else {
 951                                 if (depth > 1) {
 952                                         if (targ == -1)
 953                                                 targ = 0;
 954                                 } else {
 955                                         printk("Malformed Option %s\n",
 956                                                opt_name);
 957                                         done = TRUE;
 958                                 }
 959                         }
 960                         opt_arg++;
 961                         break;
 962                 case '}':
 963                         if (targ != -1)
 964                                 targ = -1;
 965                         else if (instance != -1)
 966                                 instance = -1;
 967                         opt_arg++;
 968                         break;
 969                 case ',':
 970                 case '.':
 971                         if (instance == -1)
 972                                 done = TRUE;
 973                         else if (targ >= 0)
 974                                 targ++;
 975                         else if (instance >= 0)
 976                                 instance++;
 977                         opt_arg++;
 978                         break;
 979                 case '\0':
 980                         done = TRUE;
 981                         break;
 982                 default:
 983                         tok_end = end;
 984                         for (i = 0; tok_list[i]; i++) {
 985                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 986                                 if ((tok_end2) && (tok_end2 < tok_end))
 987                                         tok_end = tok_end2;
 988                         }
 989                         callback(callback_arg, instance, targ,
 990                                  simple_strtol(opt_arg, NULL, 0));
 991                         opt_arg = tok_end;
 992                         break;
 993                 }
 994         }
 995         return (opt_arg);
 996 }
 997
 998 /*
 999  * Handle Linux boot parameters. This routine allows for assigning a value
1000  * to a parameter with a ':' between the parameter and the value.
1001  * ie. aic7xxx=stpwlev:1,extended
1002  */
1003 static int
1004 aic7xxx_setup(char *s)
1005 {
1006         int     i, n;
1007         char   *p;
1008         char   *end;
1009
1010         static const struct {
1011                 const char *name;
1012                 uint32_t *flag;
1013         } options[] = {
1014                 { "extended", &aic7xxx_extended },
1015                 { "no_reset", &aic7xxx_no_reset },
1016                 { "verbose", &aic7xxx_verbose },
1017                 { "allow_memio", &aic7xxx_allow_memio},
1018 #ifdef AHC_DEBUG
1019                 { "debug", &ahc_debug },
1020 #endif
1021                 { "periodic_otag", &aic7xxx_periodic_otag },
1022                 { "pci_parity", &aic7xxx_pci_parity },
1023                 { "seltime", &aic7xxx_seltime },
1024                 { "tag_info", NULL },
1025                 { "global_tag_depth", NULL },
1026                 { "dv", NULL }
1027         };
1028
1029         end = strchr(s, '\0');
1030
1031         /*
1032          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1033          * will never be 0 in this case.
1034          */
1035         n = 0;
1036
1037         while ((p = strsep(&s, ",.")) != NULL) {
1038                 if (*p == '\0')
1039                         continue;
1040                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1041
1042                         n = strlen(options[i].name);
1043                         if (strncmp(options[i].name, p, n) == 0)
1044                                 break;
1045                 }
1046                 if (i == ARRAY_SIZE(options))
1047                         continue;
1048
1049                 if (strncmp(p, "global_tag_depth", n) == 0) {
1050                         ahc_linux_setup_tag_info_global(p + n);
1051                 } else if (strncmp(p, "tag_info", n) == 0) {
1052                         s = ahc_parse_brace_option("tag_info", p + n, end,
1053                             2, ahc_linux_setup_tag_info, 0);
1054                 } else if (p[n] == ':') {
1055                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1056                 } else if (strncmp(p, "verbose", n) == 0) {
1057                         *(options[i].flag) = 1;
1058                 } else {
1059                         *(options[i].flag) ^= 0xFFFFFFFF;
1060                 }
1061         }
1062         return 1;
1063 }
1064
1065 __setup("aic7xxx=", aic7xxx_setup);
1066
1067 uint32_t aic7xxx_verbose;
1068
1069 int
1070 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1071 {
1072         char    buf[80];
1073         struct  Scsi_Host *host;
1074         char    *new_name;
1075         u_long  s;
1076         int     retval;
1077
1078         template->name = ahc->description;
1079         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1080         if (host == NULL)
1081                 return (ENOMEM);
1082
1083         *((struct ahc_softc **)host->hostdata) = ahc;
1084         ahc->platform_data->host = host;
1085         host->can_queue = AHC_MAX_QUEUE;
1086         host->cmd_per_lun = 2;
1087         /* XXX No way to communicate the ID for multiple channels */
1088         host->this_id = ahc->our_id;
1089         host->irq = ahc->platform_data->irq;
1090         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1091         host->max_lun = AHC_NUM_LUNS;
1092         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1093         host->sg_tablesize = AHC_NSEG;
1094         ahc_lock(ahc, &s);
1095         ahc_set_unit(ahc, ahc_linux_unit++);
1096         ahc_unlock(ahc, &s);
1097         sprintf(buf, "scsi%d", host->host_no);
1098         new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1099         if (new_name != NULL) {
1100                 strcpy(new_name, buf);
1101                 ahc_set_name(ahc, new_name);
1102         }
1103         host->unique_id = ahc->unit;
1104         ahc_linux_initialize_scsi_bus(ahc);
1105         ahc_intr_enable(ahc, TRUE);
1106
1107         host->transportt = ahc_linux_transport_template;
1108
1109         retval = scsi_add_host(host, ahc->dev);
1110         if (retval) {
1111                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1112                 scsi_host_put(host);
1113                 return retval;
1114         }
1115
1116         scsi_scan_host(host);
1117         return 0;
1118 }
1119
1120 /*
1121  * Place the SCSI bus into a known state by either resetting it,
1122  * or forcing transfer negotiations on the next command to any
1123  * target.
1124  */
1125 static void
1126 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1127 {
1128         int i;
1129         int numtarg;
1130         unsigned long s;
1131
1132         i = 0;
1133         numtarg = 0;
1134
1135         ahc_lock(ahc, &s);
1136
1137         if (aic7xxx_no_reset != 0)
1138                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1139
1140         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1141                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1142         else
1143                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1144
1145         if ((ahc->features & AHC_TWIN) != 0) {
1146
1147                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1148                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1149                 } else {
1150                         if (numtarg == 0)
1151                                 i = 8;
1152                         numtarg += 8;
1153                 }
1154         }
1155
1156         /*
1157          * Force negotiation to async for all targets that
1158          * will not see an initial bus reset.
1159          */
1160         for (; i < numtarg; i++) {
1161                 struct ahc_devinfo devinfo;
1162                 struct ahc_initiator_tinfo *tinfo;
1163                 struct ahc_tmode_tstate *tstate;
1164                 u_int our_id;
1165                 u_int target_id;
1166                 char channel;
1167
1168                 channel = 'A';
1169                 our_id = ahc->our_id;
1170                 target_id = i;
1171                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1172                         channel = 'B';
1173                         our_id = ahc->our_id_b;
1174                         target_id = i % 8;
1175                 }
1176                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1177                                             target_id, &tstate);
1178                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1179                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1180                 ahc_update_neg_request(ahc, &devinfo, tstate,
1181                                        tinfo, AHC_NEG_ALWAYS);
1182         }
1183         ahc_unlock(ahc, &s);
1184         /* Give the bus some time to recover */
1185         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1186                 ahc_linux_freeze_simq(ahc);
1187                 msleep(AIC7XXX_RESET_DELAY);
1188                 ahc_linux_release_simq(ahc);
1189         }
1190 }
1191
1192 int
1193 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1194 {
1195
1196         ahc->platform_data =
1197             kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
1198         if (ahc->platform_data == NULL)
1199                 return (ENOMEM);
1200         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1201         ahc_lockinit(ahc);
1202         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1203         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1204         if (aic7xxx_pci_parity == 0)
1205                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1206
1207         return (0);
1208 }
1209
1210 void
1211 ahc_platform_free(struct ahc_softc *ahc)
1212 {
1213         struct scsi_target *starget;
1214         int i;
1215
1216         if (ahc->platform_data != NULL) {
1217                 /* destroy all of the device and target objects */
1218                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1219                         starget = ahc->platform_data->starget[i];
1220                         if (starget != NULL) {
1221                                 ahc->platform_data->starget[i] = NULL;
1222                         }
1223                 }
1224
1225                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1226                         free_irq(ahc->platform_data->irq, ahc);
1227                 if (ahc->tag == BUS_SPACE_PIO
1228                  && ahc->bsh.ioport != 0)
1229                         release_region(ahc->bsh.ioport, 256);
1230                 if (ahc->tag == BUS_SPACE_MEMIO
1231                  && ahc->bsh.maddr != NULL) {
1232                         iounmap(ahc->bsh.maddr);
1233                         release_mem_region(ahc->platform_data->mem_busaddr,
1234                                            0x1000);
1235                 }
1236
1237                 if (ahc->platform_data->host)
1238                         scsi_host_put(ahc->platform_data->host);
1239
1240                 kfree(ahc->platform_data);
1241         }
1242 }
1243
1244 void
1245 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1246 {
1247         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1248                                 SCB_GET_CHANNEL(ahc, scb),
1249                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1250                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1251 }
1252
1253 void
1254 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1255                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1256 {
1257         struct ahc_linux_device *dev;
1258         int was_queuing;
1259         int now_queuing;
1260
1261         if (sdev == NULL)
1262                 return;
1263         dev = scsi_transport_device_data(sdev);
1264
1265         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1266         switch (alg) {
1267         default:
1268         case AHC_QUEUE_NONE:
1269                 now_queuing = 0;
1270                 break;
1271         case AHC_QUEUE_BASIC:
1272                 now_queuing = AHC_DEV_Q_BASIC;
1273                 break;
1274         case AHC_QUEUE_TAGGED:
1275                 now_queuing = AHC_DEV_Q_TAGGED;
1276                 break;
1277         }
1278         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1279          && (was_queuing != now_queuing)
1280          && (dev->active != 0)) {
1281                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1282                 dev->qfrozen++;
1283         }
1284
1285         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1286         if (now_queuing) {
1287                 u_int usertags;
1288
1289                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1290                 if (!was_queuing) {
1291                         /*
1292                          * Start out aggressively and allow our
1293                          * dynamic queue depth algorithm to take
1294                          * care of the rest.
1295                          */
1296                         dev->maxtags = usertags;
1297                         dev->openings = dev->maxtags - dev->active;
1298                 }
1299                 if (dev->maxtags == 0) {
1300                         /*
1301                          * Queueing is disabled by the user.
1302                          */
1303                         dev->openings = 1;
1304                 } else if (alg == AHC_QUEUE_TAGGED) {
1305                         dev->flags |= AHC_DEV_Q_TAGGED;
1306                         if (aic7xxx_periodic_otag != 0)
1307                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1308                 } else
1309                         dev->flags |= AHC_DEV_Q_BASIC;
1310         } else {
1311                 /* We can only have one opening. */
1312                 dev->maxtags = 0;
1313                 dev->openings =  1 - dev->active;
1314         }
1315         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1316         case AHC_DEV_Q_BASIC:
1317         case AHC_DEV_Q_TAGGED:
1318                 scsi_change_queue_depth(sdev,
1319                                 dev->openings + dev->active);
1320                 break;
1321         default:
1322                 /*
1323                  * We allow the OS to queue 2 untagged transactions to
1324                  * us at any time even though we can only execute them
1325                  * serially on the controller/device.  This should
1326                  * remove some latency.
1327                  */
1328                 scsi_change_queue_depth(sdev, 2);
1329                 break;
1330         }
1331 }
1332
1333 int
1334 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1335                         int lun, u_int tag, role_t role, uint32_t status)
1336 {
1337         return 0;
1338 }
1339
1340 static u_int
1341 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1342 {
1343         static int warned_user;
1344         u_int tags;
1345
1346         tags = 0;
1347         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1348                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1349                         if (warned_user == 0) {
1350
1351                                 printk(KERN_WARNING
1352 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1353 "aic7xxx: for installed controllers. Using defaults\n"
1354 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1355 "aic7xxx: the aic7xxx_osm..c source file.\n");
1356                                 warned_user++;
1357                         }
1358                         tags = AHC_MAX_QUEUE;
1359                 } else {
1360                         adapter_tag_info_t *tag_info;
1361
1362                         tag_info = &aic7xxx_tag_info[ahc->unit];
1363                         tags = tag_info->tag_commands[devinfo->target_offset];
1364                         if (tags > AHC_MAX_QUEUE)
1365                                 tags = AHC_MAX_QUEUE;
1366                 }
1367         }
1368         return (tags);
1369 }
1370
1371 /*
1372  * Determines the queue depth for a given device.
1373  */
1374 static void
1375 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1376 {
1377         struct  ahc_devinfo devinfo;
1378         u_int   tags;
1379         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1380
1381         ahc_compile_devinfo(&devinfo,
1382                             sdev->sdev_target->channel == 0
1383                           ? ahc->our_id : ahc->our_id_b,
1384                             sdev->sdev_target->id, sdev->lun,
1385                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1386                             ROLE_INITIATOR);
1387         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1388         if (tags != 0 && sdev->tagged_supported != 0) {
1389
1390                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1391                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1392                                devinfo.lun, AC_TRANSFER_NEG);
1393                 ahc_print_devinfo(ahc, &devinfo);
1394                 printk("Tagged Queuing enabled.  Depth %d\n", tags);
1395         } else {
1396                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1397                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1398                                devinfo.lun, AC_TRANSFER_NEG);
1399         }
1400 }
1401
1402 static int
1403 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1404                       struct scsi_cmnd *cmd)
1405 {
1406         struct   scb *scb;
1407         struct   hardware_scb *hscb;
1408         struct   ahc_initiator_tinfo *tinfo;
1409         struct   ahc_tmode_tstate *tstate;
1410         uint16_t mask;
1411         struct scb_tailq *untagged_q = NULL;
1412         int nseg;
1413
1414         /*
1415          * Schedule us to run later.  The only reason we are not
1416          * running is because the whole controller Q is frozen.
1417          */
1418         if (ahc->platform_data->qfrozen != 0)
1419                 return SCSI_MLQUEUE_HOST_BUSY;
1420
1421         /*
1422          * We only allow one untagged transaction
1423          * per target in the initiator role unless
1424          * we are storing a full busy target *lun*
1425          * table in SCB space.
1426          */
1427         if (!(cmd->flags & SCMD_TAGGED)
1428             && (ahc->features & AHC_SCB_BTT) == 0) {
1429                 int target_offset;
1430
1431                 target_offset = cmd->device->id + cmd->device->channel * 8;
1432                 untagged_q = &(ahc->untagged_queues[target_offset]);
1433                 if (!TAILQ_EMPTY(untagged_q))
1434                         /* if we're already executing an untagged command
1435                          * we're busy to another */
1436                         return SCSI_MLQUEUE_DEVICE_BUSY;
1437         }
1438
1439         nseg = scsi_dma_map(cmd);
1440         if (nseg < 0)
1441                 return SCSI_MLQUEUE_HOST_BUSY;
1442
1443         /*
1444          * Get an scb to use.
1445          */
1446         scb = ahc_get_scb(ahc);
1447         if (!scb) {
1448                 scsi_dma_unmap(cmd);
1449                 return SCSI_MLQUEUE_HOST_BUSY;
1450         }
1451
1452         scb->io_ctx = cmd;
1453         scb->platform_data->dev = dev;
1454         hscb = scb->hscb;
1455         cmd->host_scribble = (char *)scb;
1456
1457         /*
1458          * Fill out basics of the HSCB.
1459          */
1460         hscb->control = 0;
1461         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1462         hscb->lun = cmd->device->lun;
1463         mask = SCB_GET_TARGET_MASK(ahc, scb);
1464         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1465                                     SCB_GET_OUR_ID(scb),
1466                                     SCB_GET_TARGET(ahc, scb), &tstate);
1467         hscb->scsirate = tinfo->scsirate;
1468         hscb->scsioffset = tinfo->curr.offset;
1469         if ((tstate->ultraenb & mask) != 0)
1470                 hscb->control |= ULTRAENB;
1471
1472         if ((ahc->user_discenable & mask) != 0)
1473                 hscb->control |= DISCENB;
1474
1475         if ((tstate->auto_negotiate & mask) != 0) {
1476                 scb->flags |= SCB_AUTO_NEGOTIATE;
1477                 scb->hscb->control |= MK_MESSAGE;
1478         }
1479
1480         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1481                 if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1482                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1483                         hscb->control |= MSG_ORDERED_TASK;
1484                         dev->commands_since_idle_or_otag = 0;
1485                 } else {
1486                         hscb->control |= MSG_SIMPLE_TASK;
1487                 }
1488         }
1489
1490         hscb->cdb_len = cmd->cmd_len;
1491         if (hscb->cdb_len <= 12) {
1492                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1493         } else {
1494                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1495                 scb->flags |= SCB_CDB32_PTR;
1496         }
1497
1498         scb->platform_data->xfer_len = 0;
1499         ahc_set_residual(scb, 0);
1500         ahc_set_sense_residual(scb, 0);
1501         scb->sg_count = 0;
1502
1503         if (nseg > 0) {
1504                 struct  ahc_dma_seg *sg;
1505                 struct  scatterlist *cur_seg;
1506                 int i;
1507
1508                 /* Copy the segments into the SG list. */
1509                 sg = scb->sg_list;
1510                 /*
1511                  * The sg_count may be larger than nseg if
1512                  * a transfer crosses a 32bit page.
1513                  */
1514                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1515                         dma_addr_t addr;
1516                         bus_size_t len;
1517                         int consumed;
1518
1519                         addr = sg_dma_address(cur_seg);
1520                         len = sg_dma_len(cur_seg);
1521                         consumed = ahc_linux_map_seg(ahc, scb,
1522                                                      sg, addr, len);
1523                         sg += consumed;
1524                         scb->sg_count += consumed;
1525                 }
1526                 sg--;
1527                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1528
1529                 /*
1530                  * Reset the sg list pointer.
1531                  */
1532                 scb->hscb->sgptr =
1533                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1534
1535                 /*
1536                  * Copy the first SG into the "current"
1537                  * data pointer area.
1538                  */
1539                 scb->hscb->dataptr = scb->sg_list->addr;
1540                 scb->hscb->datacnt = scb->sg_list->len;
1541         } else {
1542                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1543                 scb->hscb->dataptr = 0;
1544                 scb->hscb->datacnt = 0;
1545                 scb->sg_count = 0;
1546         }
1547
1548         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1549         dev->openings--;
1550         dev->active++;
1551         dev->commands_issued++;
1552         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1553                 dev->commands_since_idle_or_otag++;
1554
1555         scb->flags |= SCB_ACTIVE;
1556         if (untagged_q) {
1557                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1558                 scb->flags |= SCB_UNTAGGEDQ;
1559         }
1560         ahc_queue_scb(ahc, scb);
1561         return 0;
1562 }
1563
1564 /*
1565  * SCSI controller interrupt handler.
1566  */
1567 irqreturn_t
1568 ahc_linux_isr(int irq, void *dev_id)
1569 {
1570         struct  ahc_softc *ahc;
1571         u_long  flags;
1572         int     ours;
1573
1574         ahc = (struct ahc_softc *) dev_id;
1575         ahc_lock(ahc, &flags);
1576         ours = ahc_intr(ahc);
1577         ahc_unlock(ahc, &flags);
1578         return IRQ_RETVAL(ours);
1579 }
1580
1581 void
1582 ahc_platform_flushwork(struct ahc_softc *ahc)
1583 {
1584
1585 }
1586
1587 void
1588 ahc_send_async(struct ahc_softc *ahc, char channel,
1589                u_int target, u_int lun, ac_code code)
1590 {
1591         switch (code) {
1592         case AC_TRANSFER_NEG:
1593         {
1594                 struct  scsi_target *starget;
1595                 struct  ahc_initiator_tinfo *tinfo;
1596                 struct  ahc_tmode_tstate *tstate;
1597                 int     target_offset;
1598                 unsigned int target_ppr_options;
1599
1600                 BUG_ON(target == CAM_TARGET_WILDCARD);
1601
1602                 tinfo = ahc_fetch_transinfo(ahc, channel,
1603                                                 channel == 'A' ? ahc->our_id
1604                                                                : ahc->our_id_b,
1605                                                 target, &tstate);
1606
1607                 /*
1608                  * Don't bother reporting results while
1609                  * negotiations are still pending.
1610                  */
1611                 if (tinfo->curr.period != tinfo->goal.period
1612                  || tinfo->curr.width != tinfo->goal.width
1613                  || tinfo->curr.offset != tinfo->goal.offset
1614                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1615                         if (bootverbose == 0)
1616                                 break;
1617
1618                 /*
1619                  * Don't bother reporting results that
1620                  * are identical to those last reported.
1621                  */
1622                 target_offset = target;
1623                 if (channel == 'B')
1624                         target_offset += 8;
1625                 starget = ahc->platform_data->starget[target_offset];
1626                 if (starget == NULL)
1627                         break;
1628
1629                 target_ppr_options =
1630                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1631                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1632                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1633
1634                 if (tinfo->curr.period == spi_period(starget)
1635                     && tinfo->curr.width == spi_width(starget)
1636                     && tinfo->curr.offset == spi_offset(starget)
1637                  && tinfo->curr.ppr_options == target_ppr_options)
1638                         if (bootverbose == 0)
1639                                 break;
1640
1641                 spi_period(starget) = tinfo->curr.period;
1642                 spi_width(starget) = tinfo->curr.width;
1643                 spi_offset(starget) = tinfo->curr.offset;
1644                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1645                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1646                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1647                 spi_display_xfer_agreement(starget);
1648                 break;
1649         }
1650         case AC_SENT_BDR:
1651         {
1652                 WARN_ON(lun != CAM_LUN_WILDCARD);
1653                 scsi_report_device_reset(ahc->platform_data->host,
1654                                          channel - 'A', target);
1655                 break;
1656         }
1657         case AC_BUS_RESET:
1658                 if (ahc->platform_data->host != NULL) {
1659                         scsi_report_bus_reset(ahc->platform_data->host,
1660                                               channel - 'A');
1661                 }
1662                 break;
1663         default:
1664                 panic("ahc_send_async: Unexpected async event");
1665         }
1666 }
1667
1668 /*
1669  * Calls the higher level scsi done function and frees the scb.
1670  */
1671 void
1672 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1673 {
1674         struct scsi_cmnd *cmd;
1675         struct     ahc_linux_device *dev;
1676
1677         LIST_REMOVE(scb, pending_links);
1678         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1679                 struct scb_tailq *untagged_q;
1680                 int target_offset;
1681
1682                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1683                 untagged_q = &(ahc->untagged_queues[target_offset]);
1684                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1685                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1686         } else if ((scb->flags & SCB_ACTIVE) == 0) {
1687                 /*
1688                  * Transactions aborted from the untagged queue may
1689                  * not have been dispatched to the controller, so
1690                  * only check the SCB_ACTIVE flag for tagged transactions.
1691                  */
1692                 printk("SCB %d done'd twice\n", scb->hscb->tag);
1693                 ahc_dump_card_state(ahc);
1694                 panic("Stopping for safety");
1695         }
1696         cmd = scb->io_ctx;
1697         dev = scb->platform_data->dev;
1698         dev->active--;
1699         dev->openings++;
1700         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1701                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1702                 dev->qfrozen--;
1703         }
1704         ahc_linux_unmap_scb(ahc, scb);
1705
1706         /*
1707          * Guard against stale sense data.
1708          * The Linux mid-layer assumes that sense
1709          * was retrieved anytime the first byte of
1710          * the sense buffer looks "sane".
1711          */
1712         cmd->sense_buffer[0] = 0;
1713         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1714 #ifdef AHC_REPORT_UNDERFLOWS
1715                 uint32_t amount_xferred;
1716
1717                 amount_xferred =
1718                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1719 #endif
1720                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1721 #ifdef AHC_DEBUG
1722                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1723                                 ahc_print_path(ahc, scb);
1724                                 printk("Set CAM_UNCOR_PARITY\n");
1725                         }
1726 #endif
1727                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1728 #ifdef AHC_REPORT_UNDERFLOWS
1729                 /*
1730                  * This code is disabled by default as some
1731                  * clients of the SCSI system do not properly
1732                  * initialize the underflow parameter.  This
1733                  * results in spurious termination of commands
1734                  * that complete as expected (e.g. underflow is
1735                  * allowed as command can return variable amounts
1736                  * of data.
1737                  */
1738                 } else if (amount_xferred < scb->io_ctx->underflow) {
1739                         u_int i;
1740
1741                         ahc_print_path(ahc, scb);
1742                         printk("CDB:");
1743                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1744                                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
1745                         printk("\n");
1746                         ahc_print_path(ahc, scb);
1747                         printk("Saw underflow (%ld of %ld bytes). "
1748                                "Treated as error\n",
1749                                 ahc_get_residual(scb),
1750                                 ahc_get_transfer_length(scb));
1751                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1752 #endif
1753                 } else {
1754                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1755                 }
1756         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1757                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1758         }
1759
1760         if (dev->openings == 1
1761          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1762          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1763                 dev->tag_success_count++;
1764         /*
1765          * Some devices deal with temporary internal resource
1766          * shortages by returning queue full.  When the queue
1767          * full occurrs, we throttle back.  Slowly try to get
1768          * back to our previous queue depth.
1769          */
1770         if ((dev->openings + dev->active) < dev->maxtags
1771          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1772                 dev->tag_success_count = 0;
1773                 dev->openings++;
1774         }
1775
1776         if (dev->active == 0)
1777                 dev->commands_since_idle_or_otag = 0;
1778
1779         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1780                 printk("Recovery SCB completes\n");
1781                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1782                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1783                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1784
1785                 if (ahc->platform_data->eh_done)
1786                         complete(ahc->platform_data->eh_done);
1787         }
1788
1789         ahc_free_scb(ahc, scb);
1790         ahc_linux_queue_cmd_complete(ahc, cmd);
1791 }
1792
1793 static void
1794 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1795                              struct scsi_device *sdev, struct scb *scb)
1796 {
1797         struct  ahc_devinfo devinfo;
1798         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1799
1800         ahc_compile_devinfo(&devinfo,
1801                             ahc->our_id,
1802                             sdev->sdev_target->id, sdev->lun,
1803                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1804                             ROLE_INITIATOR);
1805
1806         /*
1807          * We don't currently trust the mid-layer to
1808          * properly deal with queue full or busy.  So,
1809          * when one occurs, we tell the mid-layer to
1810          * unconditionally requeue the command to us
1811          * so that we can retry it ourselves.  We also
1812          * implement our own throttling mechanism so
1813          * we don't clobber the device with too many
1814          * commands.
1815          */
1816         switch (ahc_get_scsi_status(scb)) {
1817         default:
1818                 break;
1819         case SCSI_STATUS_CHECK_COND:
1820         case SCSI_STATUS_CMD_TERMINATED:
1821         {
1822                 struct scsi_cmnd *cmd;
1823
1824                 /*
1825                  * Copy sense information to the OS's cmd
1826                  * structure if it is available.
1827                  */
1828                 cmd = scb->io_ctx;
1829                 if (scb->flags & SCB_SENSE) {
1830                         u_int sense_size;
1831
1832                         sense_size = min(sizeof(struct scsi_sense_data)
1833                                        - ahc_get_sense_residual(scb),
1834                                          (u_long)SCSI_SENSE_BUFFERSIZE);
1835                         memcpy(cmd->sense_buffer,
1836                                ahc_get_sense_buf(ahc, scb), sense_size);
1837                         if (sense_size < SCSI_SENSE_BUFFERSIZE)
1838                                 memset(&cmd->sense_buffer[sense_size], 0,
1839                                        SCSI_SENSE_BUFFERSIZE - sense_size);
1840                         cmd->result |= (DRIVER_SENSE << 24);
1841 #ifdef AHC_DEBUG
1842                         if (ahc_debug & AHC_SHOW_SENSE) {
1843                                 int i;
1844
1845                                 printk("Copied %d bytes of sense data:",
1846                                        sense_size);
1847                                 for (i = 0; i < sense_size; i++) {
1848                                         if ((i & 0xF) == 0)
1849                                                 printk("\n");
1850                                         printk("0x%x ", cmd->sense_buffer[i]);
1851                                 }
1852                                 printk("\n");
1853                         }
1854 #endif
1855                 }
1856                 break;
1857         }
1858         case SCSI_STATUS_QUEUE_FULL:
1859         {
1860                 /*
1861                  * By the time the core driver has returned this
1862                  * command, all other commands that were queued
1863                  * to us but not the device have been returned.
1864                  * This ensures that dev->active is equal to
1865                  * the number of commands actually queued to
1866                  * the device.
1867                  */
1868                 dev->tag_success_count = 0;
1869                 if (dev->active != 0) {
1870                         /*
1871                          * Drop our opening count to the number
1872                          * of commands currently outstanding.
1873                          */
1874                         dev->openings = 0;
1875 /*
1876                         ahc_print_path(ahc, scb);
1877                         printk("Dropping tag count to %d\n", dev->active);
1878  */
1879                         if (dev->active == dev->tags_on_last_queuefull) {
1880
1881                                 dev->last_queuefull_same_count++;
1882                                 /*
1883                                  * If we repeatedly see a queue full
1884                                  * at the same queue depth, this
1885                                  * device has a fixed number of tag
1886                                  * slots.  Lock in this tag depth
1887                                  * so we stop seeing queue fulls from
1888                                  * this device.
1889                                  */
1890                                 if (dev->last_queuefull_same_count
1891                                  == AHC_LOCK_TAGS_COUNT) {
1892                                         dev->maxtags = dev->active;
1893                                         ahc_print_path(ahc, scb);
1894                                         printk("Locking max tag count at %d\n",
1895                                                dev->active);
1896                                 }
1897                         } else {
1898                                 dev->tags_on_last_queuefull = dev->active;
1899                                 dev->last_queuefull_same_count = 0;
1900                         }
1901                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1902                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1903                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1904                                      (dev->flags & AHC_DEV_Q_BASIC)
1905                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1906                         break;
1907                 }
1908                 /*
1909                  * Drop down to a single opening, and treat this
1910                  * as if the target returned BUSY SCSI status.
1911                  */
1912                 dev->openings = 1;
1913                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1914                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1915                              (dev->flags & AHC_DEV_Q_BASIC)
1916                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1917                 break;
1918         }
1919         }
1920 }
1921
1922 static void
1923 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1924 {
1925         /*
1926          * Map CAM error codes into Linux Error codes.  We
1927          * avoid the conversion so that the DV code has the
1928          * full error information available when making
1929          * state change decisions.
1930          */
1931         {
1932                 u_int new_status;
1933
1934                 switch (ahc_cmd_get_transaction_status(cmd)) {
1935                 case CAM_REQ_INPROG:
1936                 case CAM_REQ_CMP:
1937                 case CAM_SCSI_STATUS_ERROR:
1938                         new_status = DID_OK;
1939                         break;
1940                 case CAM_REQ_ABORTED:
1941                         new_status = DID_ABORT;
1942                         break;
1943                 case CAM_BUSY:
1944                         new_status = DID_BUS_BUSY;
1945                         break;
1946                 case CAM_REQ_INVALID:
1947                 case CAM_PATH_INVALID:
1948                         new_status = DID_BAD_TARGET;
1949                         break;
1950                 case CAM_SEL_TIMEOUT:
1951                         new_status = DID_NO_CONNECT;
1952                         break;
1953                 case CAM_SCSI_BUS_RESET:
1954                 case CAM_BDR_SENT:
1955                         new_status = DID_RESET;
1956                         break;
1957                 case CAM_UNCOR_PARITY:
1958                         new_status = DID_PARITY;
1959                         break;
1960                 case CAM_CMD_TIMEOUT:
1961                         new_status = DID_TIME_OUT;
1962                         break;
1963                 case CAM_UA_ABORT:
1964                 case CAM_REQ_CMP_ERR:
1965                 case CAM_AUTOSENSE_FAIL:
1966                 case CAM_NO_HBA:
1967                 case CAM_DATA_RUN_ERR:
1968                 case CAM_UNEXP_BUSFREE:
1969                 case CAM_SEQUENCE_FAIL:
1970                 case CAM_CCB_LEN_ERR:
1971                 case CAM_PROVIDE_FAIL:
1972                 case CAM_REQ_TERMIO:
1973                 case CAM_UNREC_HBA_ERROR:
1974                 case CAM_REQ_TOO_BIG:
1975                         new_status = DID_ERROR;
1976                         break;
1977                 case CAM_REQUEUE_REQ:
1978                         new_status = DID_REQUEUE;
1979                         break;
1980                 default:
1981                         /* We should never get here */
1982                         new_status = DID_ERROR;
1983                         break;
1984                 }
1985
1986                 ahc_cmd_set_transaction_status(cmd, new_status);
1987         }
1988
1989         cmd->scsi_done(cmd);
1990 }
1991
1992 static void
1993 ahc_linux_freeze_simq(struct ahc_softc *ahc)
1994 {
1995         unsigned long s;
1996
1997         ahc_lock(ahc, &s);
1998         ahc->platform_data->qfrozen++;
1999         if (ahc->platform_data->qfrozen == 1) {
2000                 scsi_block_requests(ahc->platform_data->host);
2001
2002                 /* XXX What about Twin channels? */
2003                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2004                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2005                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2006         }
2007         ahc_unlock(ahc, &s);
2008 }
2009
2010 static void
2011 ahc_linux_release_simq(struct ahc_softc *ahc)
2012 {
2013         u_long s;
2014         int    unblock_reqs;
2015
2016         unblock_reqs = 0;
2017         ahc_lock(ahc, &s);
2018         if (ahc->platform_data->qfrozen > 0)
2019                 ahc->platform_data->qfrozen--;
2020         if (ahc->platform_data->qfrozen == 0)
2021                 unblock_reqs = 1;
2022         ahc_unlock(ahc, &s);
2023         /*
2024          * There is still a race here.  The mid-layer
2025          * should keep its own freeze count and use
2026          * a bottom half handler to run the queues
2027          * so we can unblock with our own lock held.
2028          */
2029         if (unblock_reqs)
2030                 scsi_unblock_requests(ahc->platform_data->host);
2031 }
2032
2033 static int
2034 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2035 {
2036         struct ahc_softc *ahc;
2037         struct ahc_linux_device *dev;
2038         struct scb *pending_scb;
2039         u_int  saved_scbptr;
2040         u_int  active_scb_index;
2041         u_int  last_phase;
2042         u_int  saved_scsiid;
2043         u_int  cdb_byte;
2044         int    retval;
2045         int    was_paused;
2046         int    paused;
2047         int    wait;
2048         int    disconnected;
2049         unsigned long flags;
2050
2051         pending_scb = NULL;
2052         paused = FALSE;
2053         wait = FALSE;
2054         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2055
2056         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2057                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2058
2059         printk("CDB:");
2060         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2061                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
2062         printk("\n");
2063
2064         ahc_lock(ahc, &flags);
2065
2066         /*
2067          * First determine if we currently own this command.
2068          * Start by searching the device queue.  If not found
2069          * there, check the pending_scb list.  If not found
2070          * at all, and the system wanted us to just abort the
2071          * command, return success.
2072          */
2073         dev = scsi_transport_device_data(cmd->device);
2074
2075         if (dev == NULL) {
2076                 /*
2077                  * No target device for this command exists,
2078                  * so we must not still own the command.
2079                  */
2080                 printk("%s:%d:%d:%d: Is not an active device\n",
2081                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2082                        (u8)cmd->device->lun);
2083                 retval = SUCCESS;
2084                 goto no_cmd;
2085         }
2086
2087         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2088          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2089                                        cmd->device->channel + 'A',
2090                                        (u8)cmd->device->lun,
2091                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2092                 printk("%s:%d:%d:%d: Command found on untagged queue\n",
2093                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2094                        (u8)cmd->device->lun);
2095                 retval = SUCCESS;
2096                 goto done;
2097         }
2098
2099         /*
2100          * See if we can find a matching cmd in the pending list.
2101          */
2102         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2103                 if (pending_scb->io_ctx == cmd)
2104                         break;
2105         }
2106
2107         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2108
2109                 /* Any SCB for this device will do for a target reset */
2110                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2111                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2112                                           scmd_channel(cmd) + 'A',
2113                                           CAM_LUN_WILDCARD,
2114                                           SCB_LIST_NULL, ROLE_INITIATOR))
2115                                 break;
2116                 }
2117         }
2118
2119         if (pending_scb == NULL) {
2120                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2121                 goto no_cmd;
2122         }
2123
2124         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2125                 /*
2126                  * We can't queue two recovery actions using the same SCB
2127                  */
2128                 retval = FAILED;
2129                 goto  done;
2130         }
2131
2132         /*
2133          * Ensure that the card doesn't do anything
2134          * behind our back and that we didn't "just" miss
2135          * an interrupt that would affect this cmd.
2136          */
2137         was_paused = ahc_is_paused(ahc);
2138         ahc_pause_and_flushwork(ahc);
2139         paused = TRUE;
2140
2141         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2142                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2143                 goto no_cmd;
2144         }
2145
2146         printk("%s: At time of recovery, card was %spaused\n",
2147                ahc_name(ahc), was_paused ? "" : "not ");
2148         ahc_dump_card_state(ahc);
2149
2150         disconnected = TRUE;
2151         if (flag == SCB_ABORT) {
2152                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2153                                        cmd->device->channel + 'A',
2154                                        cmd->device->lun,
2155                                        pending_scb->hscb->tag,
2156                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2157                                        SEARCH_COMPLETE) > 0) {
2158                         printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2159                                ahc_name(ahc), cmd->device->channel,
2160                                cmd->device->id, (u8)cmd->device->lun);
2161                         retval = SUCCESS;
2162                         goto done;
2163                 }
2164         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2165                                       cmd->device->channel + 'A',
2166                                       cmd->device->lun,
2167                                       pending_scb->hscb->tag,
2168                                       ROLE_INITIATOR, /*status*/0,
2169                                       SEARCH_COUNT) > 0) {
2170                 disconnected = FALSE;
2171         }
2172
2173         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2174                 struct scb *bus_scb;
2175
2176                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2177                 if (bus_scb == pending_scb)
2178                         disconnected = FALSE;
2179                 else if (flag != SCB_ABORT
2180                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2181                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2182                         disconnected = FALSE;
2183         }
2184
2185         /*
2186          * At this point, pending_scb is the scb associated with the
2187          * passed in command.  That command is currently active on the
2188          * bus, is in the disconnected state, or we're hoping to find
2189          * a command for the same target active on the bus to abuse to
2190          * send a BDR.  Queue the appropriate message based on which of
2191          * these states we are in.
2192          */
2193         last_phase = ahc_inb(ahc, LASTPHASE);
2194         saved_scbptr = ahc_inb(ahc, SCBPTR);
2195         active_scb_index = ahc_inb(ahc, SCB_TAG);
2196         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2197         if (last_phase != P_BUSFREE
2198          && (pending_scb->hscb->tag == active_scb_index
2199           || (flag == SCB_DEVICE_RESET
2200            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2201
2202                 /*
2203                  * We're active on the bus, so assert ATN
2204                  * and hope that the target responds.
2205                  */
2206                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2207                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2208                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2209                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2210                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2211                 wait = TRUE;
2212         } else if (disconnected) {
2213
2214                 /*
2215                  * Actually re-queue this SCB in an attempt
2216                  * to select the device before it reconnects.
2217                  * In either case (selection or reselection),
2218                  * we will now issue the approprate message
2219                  * to the timed-out device.
2220                  *
2221                  * Set the MK_MESSAGE control bit indicating
2222                  * that we desire to send a message.  We
2223                  * also set the disconnected flag since
2224                  * in the paging case there is no guarantee
2225                  * that our SCB control byte matches the
2226                  * version on the card.  We don't want the
2227                  * sequencer to abort the command thinking
2228                  * an unsolicited reselection occurred.
2229                  */
2230                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2231                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2232
2233                 /*
2234                  * Remove any cached copy of this SCB in the
2235                  * disconnected list in preparation for the
2236                  * queuing of our abort SCB.  We use the
2237                  * same element in the SCB, SCB_NEXT, for
2238                  * both the qinfifo and the disconnected list.
2239                  */
2240                 ahc_search_disc_list(ahc, cmd->device->id,
2241                                      cmd->device->channel + 'A',
2242                                      cmd->device->lun, pending_scb->hscb->tag,
2243                                      /*stop_on_first*/TRUE,
2244                                      /*remove*/TRUE,
2245                                      /*save_state*/FALSE);
2246
2247                 /*
2248                  * In the non-paging case, the sequencer will
2249                  * never re-reference the in-core SCB.
2250                  * To make sure we are notified during
2251                  * reselection, set the MK_MESSAGE flag in
2252                  * the card's copy of the SCB.
2253                  */
2254                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2255                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2256                         ahc_outb(ahc, SCB_CONTROL,
2257                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2258                 }
2259
2260                 /*
2261                  * Clear out any entries in the QINFIFO first
2262                  * so we are the next SCB for this target
2263                  * to run.
2264                  */
2265                 ahc_search_qinfifo(ahc, cmd->device->id,
2266                                    cmd->device->channel + 'A',
2267                                    cmd->device->lun, SCB_LIST_NULL,
2268                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2269                                    SEARCH_COMPLETE);
2270                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2271                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2272                 ahc_print_path(ahc, pending_scb);
2273                 printk("Device is disconnected, re-queuing SCB\n");
2274                 wait = TRUE;
2275         } else {
2276                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2277                 retval = FAILED;
2278                 goto done;
2279         }
2280
2281 no_cmd:
2282         /*
2283          * Our assumption is that if we don't have the command, no
2284          * recovery action was required, so we return success.  Again,
2285          * the semantics of the mid-layer recovery engine are not
2286          * well defined, so this may change in time.
2287          */
2288         retval = SUCCESS;
2289 done:
2290         if (paused)
2291                 ahc_unpause(ahc);
2292         if (wait) {
2293                 DECLARE_COMPLETION_ONSTACK(done);
2294
2295                 ahc->platform_data->eh_done = &done;
2296                 ahc_unlock(ahc, &flags);
2297
2298                 printk("Recovery code sleeping\n");
2299                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2300                         ahc_lock(ahc, &flags);
2301                         ahc->platform_data->eh_done = NULL;
2302                         ahc_unlock(ahc, &flags);
2303
2304                         printk("Timer Expired\n");
2305                         retval = FAILED;
2306                 }
2307                 printk("Recovery code awake\n");
2308         } else
2309                 ahc_unlock(ahc, &flags);
2310         return (retval);
2311 }
2312
2313 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2314 {
2315         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2316         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2317         struct ahc_devinfo devinfo;
2318         unsigned long flags;
2319
2320         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2321                             starget->channel + 'A', ROLE_INITIATOR);
2322         ahc_lock(ahc, &flags);
2323         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2324         ahc_unlock(ahc, &flags);
2325 }
2326
2327 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2328 {
2329         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2330         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2331         struct ahc_tmode_tstate *tstate;
2332         struct ahc_initiator_tinfo *tinfo
2333                 = ahc_fetch_transinfo(ahc,
2334                                       starget->channel + 'A',
2335                                       shost->this_id, starget->id, &tstate);
2336         struct ahc_devinfo devinfo;
2337         unsigned int ppr_options = tinfo->goal.ppr_options;
2338         unsigned long flags;
2339         unsigned long offset = tinfo->goal.offset;
2340         const struct ahc_syncrate *syncrate;
2341
2342         if (offset == 0)
2343                 offset = MAX_OFFSET;
2344
2345         if (period < 9)
2346                 period = 9;     /* 12.5ns is our minimum */
2347         if (period == 9) {
2348                 if (spi_max_width(starget))
2349                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2350                 else
2351                         /* need wide for DT and need DT for 12.5 ns */
2352                         period = 10;
2353         }
2354
2355         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2356                             starget->channel + 'A', ROLE_INITIATOR);
2357
2358         /* all PPR requests apart from QAS require wide transfers */
2359         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2360                 if (spi_width(starget) == 0)
2361                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2362         }
2363
2364         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2365         ahc_lock(ahc, &flags);
2366         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2367                          ppr_options, AHC_TRANS_GOAL, FALSE);
2368         ahc_unlock(ahc, &flags);
2369 }
2370
2371 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2372 {
2373         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2374         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2375         struct ahc_tmode_tstate *tstate;
2376         struct ahc_initiator_tinfo *tinfo
2377                 = ahc_fetch_transinfo(ahc,
2378                                       starget->channel + 'A',
2379                                       shost->this_id, starget->id, &tstate);
2380         struct ahc_devinfo devinfo;
2381         unsigned int ppr_options = 0;
2382         unsigned int period = 0;
2383         unsigned long flags;
2384         const struct ahc_syncrate *syncrate = NULL;
2385
2386         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2387                             starget->channel + 'A', ROLE_INITIATOR);
2388         if (offset != 0) {
2389                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2390                 period = tinfo->goal.period;
2391                 ppr_options = tinfo->goal.ppr_options;
2392         }
2393         ahc_lock(ahc, &flags);
2394         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2395                          ppr_options, AHC_TRANS_GOAL, FALSE);
2396         ahc_unlock(ahc, &flags);
2397 }
2398
2399 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2400 {
2401         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2402         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2403         struct ahc_tmode_tstate *tstate;
2404         struct ahc_initiator_tinfo *tinfo
2405                 = ahc_fetch_transinfo(ahc,
2406                                       starget->channel + 'A',
2407                                       shost->this_id, starget->id, &tstate);
2408         struct ahc_devinfo devinfo;
2409         unsigned int ppr_options = tinfo->goal.ppr_options
2410                 & ~MSG_EXT_PPR_DT_REQ;
2411         unsigned int period = tinfo->goal.period;
2412         unsigned int width = tinfo->goal.width;
2413         unsigned long flags;
2414         const struct ahc_syncrate *syncrate;
2415
2416         if (dt && spi_max_width(starget)) {
2417                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2418                 if (!width)
2419                         ahc_linux_set_width(starget, 1);
2420         } else if (period == 9)
2421                 period = 10;    /* if resetting DT, period must be >= 25ns */
2422
2423         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2424                             starget->channel + 'A', ROLE_INITIATOR);
2425         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2426         ahc_lock(ahc, &flags);
2427         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2428                          ppr_options, AHC_TRANS_GOAL, FALSE);
2429         ahc_unlock(ahc, &flags);
2430 }
2431
2432 #if 0
2433 /* FIXME: This code claims to support IU and QAS.  However, the actual
2434  * sequencer code and aic7xxx_core have no support for these parameters and
2435  * will get into a bad state if they're negotiated.  Do not enable this
2436  * unless you know what you're doing */
2437 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2438 {
2439         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2440         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2441         struct ahc_tmode_tstate *tstate;
2442         struct ahc_initiator_tinfo *tinfo
2443                 = ahc_fetch_transinfo(ahc,
2444                                       starget->channel + 'A',
2445                                       shost->this_id, starget->id, &tstate);
2446         struct ahc_devinfo devinfo;
2447         unsigned int ppr_options = tinfo->goal.ppr_options
2448                 & ~MSG_EXT_PPR_QAS_REQ;
2449         unsigned int period = tinfo->goal.period;
2450         unsigned long flags;
2451         struct ahc_syncrate *syncrate;
2452
2453         if (qas)
2454                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2455
2456         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2457                             starget->channel + 'A', ROLE_INITIATOR);
2458         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2459         ahc_lock(ahc, &flags);
2460         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2461                          ppr_options, AHC_TRANS_GOAL, FALSE);
2462         ahc_unlock(ahc, &flags);
2463 }
2464
2465 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2466 {
2467         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2468         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2469         struct ahc_tmode_tstate *tstate;
2470         struct ahc_initiator_tinfo *tinfo
2471                 = ahc_fetch_transinfo(ahc,
2472                                       starget->channel + 'A',
2473                                       shost->this_id, starget->id, &tstate);
2474         struct ahc_devinfo devinfo;
2475         unsigned int ppr_options = tinfo->goal.ppr_options
2476                 & ~MSG_EXT_PPR_IU_REQ;
2477         unsigned int period = tinfo->goal.period;
2478         unsigned long flags;
2479         struct ahc_syncrate *syncrate;
2480
2481         if (iu)
2482                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2483
2484         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2485                             starget->channel + 'A', ROLE_INITIATOR);
2486         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2487         ahc_lock(ahc, &flags);
2488         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2489                          ppr_options, AHC_TRANS_GOAL, FALSE);
2490         ahc_unlock(ahc, &flags);
2491 }
2492 #endif
2493
2494 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2495 {
2496         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2497         unsigned long flags;
2498         u8 mode;
2499
2500         if (!(ahc->features & AHC_ULTRA2)) {
2501                 /* non-LVD chipset, may not have SBLKCTL reg */
2502                 spi_signalling(shost) =
2503                         ahc->features & AHC_HVD ?
2504                         SPI_SIGNAL_HVD :
2505                         SPI_SIGNAL_SE;
2506                 return;
2507         }
2508
2509         ahc_lock(ahc, &flags);
2510         ahc_pause(ahc);
2511         mode = ahc_inb(ahc, SBLKCTL);
2512         ahc_unpause(ahc);
2513         ahc_unlock(ahc, &flags);
2514
2515         if (mode & ENAB40)
2516                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2517         else if (mode & ENAB20)
2518                 spi_signalling(shost) = SPI_SIGNAL_SE;
2519         else
2520                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2521 }
2522
2523 static struct spi_function_template ahc_linux_transport_functions = {
2524         .set_offset     = ahc_linux_set_offset,
2525         .show_offset    = 1,
2526         .set_period     = ahc_linux_set_period,
2527         .show_period    = 1,
2528         .set_width      = ahc_linux_set_width,
2529         .show_width     = 1,
2530         .set_dt         = ahc_linux_set_dt,
2531         .show_dt        = 1,
2532 #if 0
2533         .set_iu         = ahc_linux_set_iu,
2534         .show_iu        = 1,
2535         .set_qas        = ahc_linux_set_qas,
2536         .show_qas       = 1,
2537 #endif
2538         .get_signalling = ahc_linux_get_signalling,
2539 };
2540
2541
2542
2543 static int __init
2544 ahc_linux_init(void)
2545 {
2546         /*
2547          * If we've been passed any parameters, process them now.
2548          */
2549         if (aic7xxx)
2550                 aic7xxx_setup(aic7xxx);
2551
2552         ahc_linux_transport_template =
2553                 spi_attach_transport(&ahc_linux_transport_functions);
2554         if (!ahc_linux_transport_template)
2555                 return -ENODEV;
2556
2557         scsi_transport_reserve_device(ahc_linux_transport_template,
2558                                       sizeof(struct ahc_linux_device));
2559
2560         ahc_linux_pci_init();
2561         ahc_linux_eisa_init();
2562         return 0;
2563 }
2564
2565 static void
2566 ahc_linux_exit(void)
2567 {
2568         ahc_linux_pci_exit();
2569         ahc_linux_eisa_exit();
2570         spi_release_transport(ahc_linux_transport_template);
2571 }
2572
2573 module_init(ahc_linux_init);
2574 module_exit(ahc_linux_exit);