drivers/scsi/aic7xxx/aic7xxx_osm.c

   1
   2 /*
   3  * Adaptec AIC7xxx device driver for Linux.
   4  *
   5  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   6  *
   7  * Copyright (c) 1994 John Aycock
   8  *   The University of Calgary Department of Computer Science.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  25  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  26  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  27  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  28  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  29  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  30  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  31  * ANSI SCSI-2 specification (draft 10c), ...
  32  *
  33  * --------------------------------------------------------------------------
  34  *
  35  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  36  *
  37  *  Substantially modified to include support for wide and twin bus
  38  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  39  *  SCB paging, and other rework of the code.
  40  *
  41  * --------------------------------------------------------------------------
  42  * Copyright (c) 1994-2000 Justin T. Gibbs.
  43  * Copyright (c) 2000-2001 Adaptec Inc.
  44  * All rights reserved.
  45  *
  46  * Redistribution and use in source and binary forms, with or without
  47  * modification, are permitted provided that the following conditions
  48  * are met:
  49  * 1. Redistributions of source code must retain the above copyright
  50  *    notice, this list of conditions, and the following disclaimer,
  51  *    without modification.
  52  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  53  *    substantially similar to the "NO WARRANTY" disclaimer below
  54  *    ("Disclaimer") and any redistribution must be conditioned upon
  55  *    including a substantially similar Disclaimer requirement for further
  56  *    binary redistribution.
  57  * 3. Neither the names of the above-listed copyright holders nor the names
  58  *    of any contributors may be used to endorse or promote products derived
  59  *    from this software without specific prior written permission.
  60  *
  61  * Alternatively, this software may be distributed under the terms of the
  62  * GNU General Public License ("GPL") version 2 as published by the Free
  63  * Software Foundation.
  64  *
  65  * NO WARRANTY
  66  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  67  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  68  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  69  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  70  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  71  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  72  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  73  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  74  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  75  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  76  * POSSIBILITY OF SUCH DAMAGES.
  77  *
  78  *---------------------------------------------------------------------------
  79  *
  80  *  Thanks also go to (in alphabetical order) the following:
  81  *
  82  *    Rory Bolt     - Sequencer bug fixes
  83  *    Jay Estabrook - Initial DEC Alpha support
  84  *    Doug Ledford  - Much needed abort/reset bug fixes
  85  *    Kai Makisara  - DMAing of SCBs
  86  *
  87  *  A Boot time option was also added for not resetting the scsi bus.
  88  *
  89  *    Form:  aic7xxx=extended
  90  *           aic7xxx=no_reset
  91  *           aic7xxx=verbose
  92  *
  93  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  94  *
  95  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  96  */
  97
  98 /*
  99  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
 100  *
 101  * Copyright (c) 1997-1999 Doug Ledford
 102  *
 103  * These changes are released under the same licensing terms as the FreeBSD
 104  * driver written by Justin Gibbs.  Please see his Copyright notice above
 105  * for the exact terms and conditions covering my changes as well as the
 106  * warranty statement.
 107  *
 108  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 109  * but are not limited to:
 110  *
 111  *  1: Import of the latest FreeBSD sequencer code for this driver
 112  *  2: Modification of kernel code to accommodate different sequencer semantics
 113  *  3: Extensive changes throughout kernel portion of driver to improve
 114  *     abort/reset processing and error hanndling
 115  *  4: Other work contributed by various people on the Internet
 116  *  5: Changes to printk information and verbosity selection code
 117  *  6: General reliability related changes, especially in IRQ management
 118  *  7: Modifications to the default probe/attach order for supported cards
 119  *  8: SMP friendliness has been improved
 120  *
 121  */
 122
 123 #include "aic7xxx_osm.h"
 124 #include "aic7xxx_inline.h"
 125 #include <scsi/scsicam.h>
 126
 127 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 128
 129 #include <linux/init.h>         /* __setup */
 130 #include <linux/mm.h>           /* For fetching system memory size */
 131 #include <linux/blkdev.h>               /* For block_size() */
 132 #include <linux/delay.h>        /* For ssleep/msleep */
 133 #include <linux/slab.h>
 134
 135
 136 /*
 137  * Set this to the delay in seconds after SCSI bus reset.
 138  * Note, we honor this only for the initial bus reset.
 139  * The scsi error recovery code performs its own bus settle
 140  * delay handling for error recovery actions.
 141  */
 142 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 143 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 144 #else
 145 #define AIC7XXX_RESET_DELAY 5000
 146 #endif
 147
 148 /*
 149  * To change the default number of tagged transactions allowed per-device,
 150  * add a line to the lilo.conf file like:
 151  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 152  * which will result in the first four devices on the first two
 153  * controllers being set to a tagged queue depth of 32.
 154  *
 155  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 156  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 157  * for channel 1.
 158  */
 159 typedef struct {
 160         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 161 } adapter_tag_info_t;
 162
 163 /*
 164  * Modify this as you see fit for your system.
 165  *
 166  * 0                    tagged queuing disabled
 167  * 1 <= n <= 253        n == max tags ever dispatched.
 168  *
 169  * The driver will throttle the number of commands dispatched to a
 170  * device if it returns queue full.  For devices with a fixed maximum
 171  * queue depth, the driver will eventually determine this depth and
 172  * lock it in (a console message is printed to indicate that a lock
 173  * has occurred).  On some devices, queue full is returned for a temporary
 174  * resource shortage.  These devices will return queue full at varying
 175  * depths.  The driver will throttle back when the queue fulls occur and
 176  * attempt to slowly increase the depth over time as the device recovers
 177  * from the resource shortage.
 178  *
 179  * In this example, the first line will disable tagged queueing for all
 180  * the devices on the first probed aic7xxx adapter.
 181  *
 182  * The second line enables tagged queueing with 4 commands/LUN for IDs
 183  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 184  * driver to attempt to use up to 64 tags for ID 1.
 185  *
 186  * The third line is the same as the first line.
 187  *
 188  * The fourth line disables tagged queueing for devices 0 and 3.  It
 189  * enables tagged queueing for the other IDs, with 16 commands/LUN
 190  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 191  * IDs 2, 5-7, and 9-15.
 192  */
 193
 194 /*
 195  * NOTE: The below structure is for reference only, the actual structure
 196  *       to modify in order to change things is just below this comment block.
 197 adapter_tag_info_t aic7xxx_tag_info[] =
 198 {
 199         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 200         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 201         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 202         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 203 };
 204 */
 205
 206 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 207 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 208 #else
 209 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 210 #endif
 211
 212 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 213         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 214         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 215         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 216         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 217         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 218         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 219         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 220         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 221 }
 222
 223 /*
 224  * By default, use the number of commands specified by
 225  * the users kernel configuration.
 226  */
 227 static adapter_tag_info_t aic7xxx_tag_info[] =
 228 {
 229         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 230         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 231         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 232         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 233         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 234         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 235         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 236         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 245 };
 246
 247 /*
 248  * There should be a specific return value for this in scsi.h, but
 249  * it seems that most drivers ignore it.
 250  */
 251 #define DID_UNDERFLOW   DID_ERROR
 252
 253 void
 254 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 255 {
 256         printk("(scsi%d:%c:%d:%d): ",
 257                ahc->platform_data->host->host_no,
 258                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 259                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 260                scb != NULL ? SCB_GET_LUN(scb) : -1);
 261 }
 262
 263 /*
 264  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 265  *       cards in the system.  This should be fixed.  Exceptions to this
 266  *       rule are noted in the comments.
 267  */
 268
 269 /*
 270  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 271  * has no effect on any later resets that might occur due to things like
 272  * SCSI bus timeouts.
 273  */
 274 static uint32_t aic7xxx_no_reset;
 275
 276 /*
 277  * Should we force EXTENDED translation on a controller.
 278  *     0 == Use whatever is in the SEEPROM or default to off
 279  *     1 == Use whatever is in the SEEPROM or default to on
 280  */
 281 static uint32_t aic7xxx_extended;
 282
 283 /*
 284  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 285  * dubious at best.  To my knowledge, this option has never actually
 286  * solved a PCI parity problem, but on certain machines with broken PCI
 287  * chipset configurations where stray PCI transactions with bad parity are
 288  * the norm rather than the exception, the error messages can be overwhelming.
 289  * It's included in the driver for completeness.
 290  *   0     = Shut off PCI parity check
 291  *   non-0 = reverse polarity pci parity checking
 292  */
 293 static uint32_t aic7xxx_pci_parity = ~0;
 294
 295 /*
 296  * There are lots of broken chipsets in the world.  Some of them will
 297  * violate the PCI spec when we issue byte sized memory writes to our
 298  * controller.  I/O mapped register access, if allowed by the given
 299  * platform, will work in almost all cases.
 300  */
 301 uint32_t aic7xxx_allow_memio = ~0;
 302
 303 /*
 304  * So that we can set how long each device is given as a selection timeout.
 305  * The table of values goes like this:
 306  *   0 - 256ms
 307  *   1 - 128ms
 308  *   2 - 64ms
 309  *   3 - 32ms
 310  * We default to 256ms because some older devices need a longer time
 311  * to respond to initial selection.
 312  */
 313 static uint32_t aic7xxx_seltime;
 314
 315 /*
 316  * Certain devices do not perform any aging on commands.  Should the
 317  * device be saturated by commands in one portion of the disk, it is
 318  * possible for transactions on far away sectors to never be serviced.
 319  * To handle these devices, we can periodically send an ordered tag to
 320  * force all outstanding transactions to be serviced prior to a new
 321  * transaction.
 322  */
 323 static uint32_t aic7xxx_periodic_otag;
 324
 325 /*
 326  * Module information and settable options.
 327  */
 328 static char *aic7xxx = NULL;
 329
 330 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 331 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
 332 MODULE_LICENSE("Dual BSD/GPL");
 333 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 334 module_param(aic7xxx, charp, 0444);
 335 MODULE_PARM_DESC(aic7xxx,
 336 "period-delimited options string:\n"
 337 "       verbose                 Enable verbose/diagnostic logging\n"
 338 "       allow_memio             Allow device registers to be memory mapped\n"
 339 "       debug                   Bitmask of debug values to enable\n"
 340 "       no_probe                Toggle EISA/VLB controller probing\n"
 341 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 342 "       no_reset                Suppress initial bus resets\n"
 343 "       extended                Enable extended geometry on all controllers\n"
 344 "       periodic_otag           Send an ordered tagged transaction\n"
 345 "                               periodically to prevent tag starvation.\n"
 346 "                               This may be required by some older disk\n"
 347 "                               drives or RAID arrays.\n"
 348 "       tag_info:<tag_str>      Set per-target tag depth\n"
 349 "       global_tag_depth:<int>  Global tag depth for every target\n"
 350 "                               on every bus\n"
 351 "       seltime:<int>           Selection Timeout\n"
 352 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 353 "\n"
 354 "       Sample modprobe configuration file:\n"
 355 "       #       Toggle EISA/VLB probing\n"
 356 "       #       Set tag depth on Controller 1/Target 1 to 10 tags\n"
 357 "       #       Shorten the selection timeout to 128ms\n"
 358 "\n"
 359 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 360 );
 361
 362 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 363                                          struct scsi_device *,
 364                                          struct scb *);
 365 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 366                                          struct scsi_cmnd *cmd);
 367 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 368 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 369 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 370 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 371 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 372                                      struct ahc_devinfo *devinfo);
 373 static void ahc_linux_device_queue_depth(struct scsi_device *);
 374 static int ahc_linux_run_command(struct ahc_softc*,
 375                                  struct ahc_linux_device *,
 376                                  struct scsi_cmnd *);
 377 static void ahc_linux_setup_tag_info_global(char *p);
 378 static int  aic7xxx_setup(char *s);
 379
 380 static int ahc_linux_unit;
 381
 382
 383 /************************** OS Utility Wrappers *******************************/
 384 void
 385 ahc_delay(long usec)
 386 {
 387         /*
 388          * udelay on Linux can have problems for
 389          * multi-millisecond waits.  Wait at most
 390          * 1024us per call.
 391          */
 392         while (usec > 0) {
 393                 udelay(usec % 1024);
 394                 usec -= 1024;
 395         }
 396 }
 397
 398 /***************************** Low Level I/O **********************************/
 399 uint8_t
 400 ahc_inb(struct ahc_softc * ahc, long port)
 401 {
 402         uint8_t x;
 403
 404         if (ahc->tag == BUS_SPACE_MEMIO) {
 405                 x = readb(ahc->bsh.maddr + port);
 406         } else {
 407                 x = inb(ahc->bsh.ioport + port);
 408         }
 409         mb();
 410         return (x);
 411 }
 412
 413 void
 414 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
 415 {
 416         if (ahc->tag == BUS_SPACE_MEMIO) {
 417                 writeb(val, ahc->bsh.maddr + port);
 418         } else {
 419                 outb(val, ahc->bsh.ioport + port);
 420         }
 421         mb();
 422 }
 423
 424 void
 425 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 426 {
 427         int i;
 428
 429         /*
 430          * There is probably a more efficient way to do this on Linux
 431          * but we don't use this for anything speed critical and this
 432          * should work.
 433          */
 434         for (i = 0; i < count; i++)
 435                 ahc_outb(ahc, port, *array++);
 436 }
 437
 438 void
 439 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 440 {
 441         int i;
 442
 443         /*
 444          * There is probably a more efficient way to do this on Linux
 445          * but we don't use this for anything speed critical and this
 446          * should work.
 447          */
 448         for (i = 0; i < count; i++)
 449                 *array++ = ahc_inb(ahc, port);
 450 }
 451
 452 /********************************* Inlines ************************************/
 453 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 454
 455 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 456                                       struct ahc_dma_seg *sg,
 457                                       dma_addr_t addr, bus_size_t len);
 458
 459 static void
 460 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 461 {
 462         struct scsi_cmnd *cmd;
 463
 464         cmd = scb->io_ctx;
 465         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 466
 467         scsi_dma_unmap(cmd);
 468 }
 469
 470 static int
 471 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 472                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 473 {
 474         int      consumed;
 475
 476         if ((scb->sg_count + 1) > AHC_NSEG)
 477                 panic("Too few segs for dma mapping.  "
 478                       "Increase AHC_NSEG\n");
 479
 480         consumed = 1;
 481         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 482         scb->platform_data->xfer_len += len;
 483
 484         if (sizeof(dma_addr_t) > 4
 485          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 486                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 487
 488         sg->len = ahc_htole32(len);
 489         return (consumed);
 490 }
 491
 492 /*
 493  * Return a string describing the driver.
 494  */
 495 static const char *
 496 ahc_linux_info(struct Scsi_Host *host)
 497 {
 498         static char buffer[512];
 499         char    ahc_info[256];
 500         char   *bp;
 501         struct ahc_softc *ahc;
 502
 503         bp = &buffer[0];
 504         ahc = *(struct ahc_softc **)host->hostdata;
 505         memset(bp, 0, sizeof(buffer));
 506         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
 507                         "        <");
 508         strcat(bp, ahc->description);
 509         strcat(bp, ">\n"
 510                         "        ");
 511         ahc_controller_info(ahc, ahc_info);
 512         strcat(bp, ahc_info);
 513         strcat(bp, "\n");
 514
 515         return (bp);
 516 }
 517
 518 /*
 519  * Queue an SCB to the controller.
 520  */
 521 static int ahc_linux_queue_lck(struct scsi_cmnd *cmd)
 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->result = CAM_REQ_INPROG << 16;
 533                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 534         }
 535         ahc_unlock(ahc, &flags);
 536
 537         return rtn;
 538 }
 539
 540 static DEF_SCSI_QCMD(ahc_linux_queue)
 541
 542 static inline struct scsi_target **
 543 ahc_linux_target_in_softc(struct scsi_target *starget)
 544 {
 545         struct  ahc_softc *ahc =
 546                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 547         unsigned int target_offset;
 548
 549         target_offset = starget->id;
 550         if (starget->channel != 0)
 551                 target_offset += 8;
 552
 553         return &ahc->platform_data->starget[target_offset];
 554 }
 555
 556 static int
 557 ahc_linux_target_alloc(struct scsi_target *starget)
 558 {
 559         struct  ahc_softc *ahc =
 560                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 561         struct seeprom_config *sc = ahc->seep_config;
 562         unsigned long flags;
 563         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 564         unsigned short scsirate;
 565         struct ahc_devinfo devinfo;
 566         char channel = starget->channel + 'A';
 567         unsigned int our_id = ahc->our_id;
 568         unsigned int target_offset;
 569
 570         target_offset = starget->id;
 571         if (starget->channel != 0)
 572                 target_offset += 8;
 573
 574         if (starget->channel)
 575                 our_id = ahc->our_id_b;
 576
 577         ahc_lock(ahc, &flags);
 578
 579         BUG_ON(*ahc_targp != NULL);
 580
 581         *ahc_targp = starget;
 582
 583         if (sc) {
 584                 int maxsync = AHC_SYNCRATE_DT;
 585                 int ultra = 0;
 586                 int flags = sc->device_flags[target_offset];
 587
 588                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 589                     if (flags & CFSYNCHISULTRA)
 590                         ultra = 1;
 591                 } else if (flags & CFULTRAEN)
 592                         ultra = 1;
 593                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 594                  * change it to ultra=0, CFXFER = 0 */
 595                 if(ultra && (flags & CFXFER) == 0x04) {
 596                         ultra = 0;
 597                         flags &= ~CFXFER;
 598                 }
 599
 600                 if ((ahc->features & AHC_ULTRA2) != 0) {
 601                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 602                 } else {
 603                         scsirate = (flags & CFXFER) << 4;
 604                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 605                                 AHC_SYNCRATE_FAST;
 606                 }
 607                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 608                 if (!(flags & CFSYNCH))
 609                         spi_max_offset(starget) = 0;
 610                 spi_min_period(starget) =
 611                         ahc_find_period(ahc, scsirate, maxsync);
 612         }
 613         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 614                             CAM_LUN_WILDCARD, channel,
 615                             ROLE_INITIATOR);
 616         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 617                          AHC_TRANS_GOAL, /*paused*/FALSE);
 618         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 619                       AHC_TRANS_GOAL, /*paused*/FALSE);
 620         ahc_unlock(ahc, &flags);
 621
 622         return 0;
 623 }
 624
 625 static void
 626 ahc_linux_target_destroy(struct scsi_target *starget)
 627 {
 628         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 629
 630         *ahc_targp = NULL;
 631 }
 632
 633 static int
 634 ahc_linux_slave_alloc(struct scsi_device *sdev)
 635 {
 636         struct  ahc_softc *ahc =
 637                 *((struct ahc_softc **)sdev->host->hostdata);
 638         struct scsi_target *starget = sdev->sdev_target;
 639         struct ahc_linux_device *dev;
 640
 641         if (bootverbose)
 642                 printk("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 643
 644         dev = scsi_transport_device_data(sdev);
 645         memset(dev, 0, sizeof(*dev));
 646
 647         /*
 648          * We start out life using untagged
 649          * transactions of which we allow one.
 650          */
 651         dev->openings = 1;
 652
 653         /*
 654          * Set maxtags to 0.  This will be changed if we
 655          * later determine that we are dealing with
 656          * a tagged queuing capable device.
 657          */
 658         dev->maxtags = 0;
 659
 660         spi_period(starget) = 0;
 661
 662         return 0;
 663 }
 664
 665 static int
 666 ahc_linux_slave_configure(struct scsi_device *sdev)
 667 {
 668         if (bootverbose)
 669                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 670
 671         ahc_linux_device_queue_depth(sdev);
 672
 673         /* Initial Domain Validation */
 674         if (!spi_initial_dv(sdev->sdev_target))
 675                 spi_dv_device(sdev);
 676
 677         return 0;
 678 }
 679
 680 #if defined(__i386__)
 681 /*
 682  * Return the disk geometry for the given SCSI device.
 683  */
 684 static int
 685 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 686                     sector_t capacity, int geom[])
 687 {
 688         int      heads;
 689         int      sectors;
 690         int      cylinders;
 691         int      extended;
 692         struct   ahc_softc *ahc;
 693         u_int    channel;
 694
 695         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 696         channel = sdev_channel(sdev);
 697
 698         if (scsi_partsize(bdev, capacity, geom))
 699                 return 0;
 700
 701         heads = 64;
 702         sectors = 32;
 703         cylinders = aic_sector_div(capacity, heads, sectors);
 704
 705         if (aic7xxx_extended != 0)
 706                 extended = 1;
 707         else if (channel == 0)
 708                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 709         else
 710                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 711         if (extended && cylinders >= 1024) {
 712                 heads = 255;
 713                 sectors = 63;
 714                 cylinders = aic_sector_div(capacity, heads, sectors);
 715         }
 716         geom[0] = heads;
 717         geom[1] = sectors;
 718         geom[2] = cylinders;
 719         return (0);
 720 }
 721 #endif
 722
 723 /*
 724  * Abort the current SCSI command(s).
 725  */
 726 static int
 727 ahc_linux_abort(struct scsi_cmnd *cmd)
 728 {
 729         int error;
 730
 731         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 732         if (error != SUCCESS)
 733                 printk("aic7xxx_abort returns 0x%x\n", error);
 734         return (error);
 735 }
 736
 737 /*
 738  * Attempt to send a target reset message to the device that timed out.
 739  */
 740 static int
 741 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 742 {
 743         int error;
 744
 745         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 746         if (error != SUCCESS)
 747                 printk("aic7xxx_dev_reset returns 0x%x\n", error);
 748         return (error);
 749 }
 750
 751 /*
 752  * Reset the SCSI bus.
 753  */
 754 static int
 755 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 756 {
 757         struct ahc_softc *ahc;
 758         int    found;
 759         unsigned long flags;
 760
 761         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 762
 763         ahc_lock(ahc, &flags);
 764         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 765                                   /*initiate reset*/TRUE);
 766         ahc_unlock(ahc, &flags);
 767
 768         if (bootverbose)
 769                 printk("%s: SCSI bus reset delivered. "
 770                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 771
 772         return SUCCESS;
 773 }
 774
 775 struct scsi_host_template aic7xxx_driver_template = {
 776         .module                 = THIS_MODULE,
 777         .name                   = "aic7xxx",
 778         .proc_name              = "aic7xxx",
 779         .show_info              = ahc_linux_show_info,
 780         .write_info             = ahc_proc_write_seeprom,
 781         .info                   = ahc_linux_info,
 782         .queuecommand           = ahc_linux_queue,
 783         .eh_abort_handler       = ahc_linux_abort,
 784         .eh_device_reset_handler = ahc_linux_dev_reset,
 785         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 786 #if defined(__i386__)
 787         .bios_param             = ahc_linux_biosparam,
 788 #endif
 789         .can_queue              = AHC_MAX_QUEUE,
 790         .this_id                = -1,
 791         .max_sectors            = 8192,
 792         .cmd_per_lun            = 2,
 793         .slave_alloc            = ahc_linux_slave_alloc,
 794         .slave_configure        = ahc_linux_slave_configure,
 795         .target_alloc           = ahc_linux_target_alloc,
 796         .target_destroy         = ahc_linux_target_destroy,
 797 };
 798
 799 /**************************** Tasklet Handler *********************************/
 800
 801 /******************************** Macros **************************************/
 802 #define BUILD_SCSIID(ahc, cmd)                                              \
 803         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 804         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 805         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 806
 807 /******************************** Bus DMA *************************************/
 808 int
 809 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 810                    bus_size_t alignment, bus_size_t boundary,
 811                    dma_addr_t lowaddr, dma_addr_t highaddr,
 812                    bus_dma_filter_t *filter, void *filterarg,
 813                    bus_size_t maxsize, int nsegments,
 814                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 815 {
 816         bus_dma_tag_t dmat;
 817
 818         dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
 819         if (dmat == NULL)
 820                 return (ENOMEM);
 821
 822         /*
 823          * Linux is very simplistic about DMA memory.  For now don't
 824          * maintain all specification information.  Once Linux supplies
 825          * better facilities for doing these operations, or the
 826          * needs of this particular driver change, we might need to do
 827          * more here.
 828          */
 829         dmat->alignment = alignment;
 830         dmat->boundary = boundary;
 831         dmat->maxsize = maxsize;
 832         *ret_tag = dmat;
 833         return (0);
 834 }
 835
 836 void
 837 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 838 {
 839         kfree(dmat);
 840 }
 841
 842 int
 843 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 844                  int flags, bus_dmamap_t *mapp)
 845 {
 846         /* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
 847         *vaddr = dma_alloc_coherent(ahc->dev, dmat->maxsize, mapp, GFP_ATOMIC);
 848         if (*vaddr == NULL)
 849                 return ENOMEM;
 850         return 0;
 851 }
 852
 853 void
 854 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 855                 void* vaddr, bus_dmamap_t map)
 856 {
 857         dma_free_coherent(ahc->dev, dmat->maxsize, vaddr, map);
 858 }
 859
 860 int
 861 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 862                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 863                 void *cb_arg, int flags)
 864 {
 865         /*
 866          * Assume for now that this will only be used during
 867          * initialization and not for per-transaction buffer mapping.
 868          */
 869         bus_dma_segment_t stack_sg;
 870
 871         stack_sg.ds_addr = map;
 872         stack_sg.ds_len = dmat->maxsize;
 873         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 874         return (0);
 875 }
 876
 877 void
 878 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 879 {
 880 }
 881
 882 int
 883 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 884 {
 885         /* Nothing to do */
 886         return (0);
 887 }
 888
 889 static void
 890 ahc_linux_setup_tag_info_global(char *p)
 891 {
 892         int tags, i, j;
 893
 894         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 895         printk("Setting Global Tags= %d\n", tags);
 896
 897         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 898                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 899                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 900                 }
 901         }
 902 }
 903
 904 static void
 905 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 906 {
 907
 908         if ((instance >= 0) && (targ >= 0)
 909          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 910          && (targ < AHC_NUM_TARGETS)) {
 911                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 912                 if (bootverbose)
 913                         printk("tag_info[%d:%d] = %d\n", instance, targ, value);
 914         }
 915 }
 916
 917 static char *
 918 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 919                        void (*callback)(u_long, int, int, int32_t),
 920                        u_long callback_arg)
 921 {
 922         char    *tok_end;
 923         char    *tok_end2;
 924         int      i;
 925         int      instance;
 926         int      targ;
 927         int      done;
 928         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 929
 930         /* All options use a ':' name/arg separator */
 931         if (*opt_arg != ':')
 932                 return (opt_arg);
 933         opt_arg++;
 934         instance = -1;
 935         targ = -1;
 936         done = FALSE;
 937         /*
 938          * Restore separator that may be in
 939          * the middle of our option argument.
 940          */
 941         tok_end = strchr(opt_arg, '\0');
 942         if (tok_end < end)
 943                 *tok_end = ',';
 944         while (!done) {
 945                 switch (*opt_arg) {
 946                 case '{':
 947                         if (instance == -1) {
 948                                 instance = 0;
 949                         } else {
 950                                 if (depth > 1) {
 951                                         if (targ == -1)
 952                                                 targ = 0;
 953                                 } else {
 954                                         printk("Malformed Option %s\n",
 955                                                opt_name);
 956                                         done = TRUE;
 957                                 }
 958                         }
 959                         opt_arg++;
 960                         break;
 961                 case '}':
 962                         if (targ != -1)
 963                                 targ = -1;
 964                         else if (instance != -1)
 965                                 instance = -1;
 966                         opt_arg++;
 967                         break;
 968                 case ',':
 969                 case '.':
 970                         if (instance == -1)
 971                                 done = TRUE;
 972                         else if (targ >= 0)
 973                                 targ++;
 974                         else if (instance >= 0)
 975                                 instance++;
 976                         opt_arg++;
 977                         break;
 978                 case '\0':
 979                         done = TRUE;
 980                         break;
 981                 default:
 982                         tok_end = end;
 983                         for (i = 0; tok_list[i]; i++) {
 984                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 985                                 if ((tok_end2) && (tok_end2 < tok_end))
 986                                         tok_end = tok_end2;
 987                         }
 988                         callback(callback_arg, instance, targ,
 989                                  simple_strtol(opt_arg, NULL, 0));
 990                         opt_arg = tok_end;
 991                         break;
 992                 }
 993         }
 994         return (opt_arg);
 995 }
 996
 997 /*
 998  * Handle Linux boot parameters. This routine allows for assigning a value
 999  * to a parameter with a ':' between the parameter and the value.
1000  * ie. aic7xxx=stpwlev:1,extended
1001  */
1002 static int
1003 aic7xxx_setup(char *s)
1004 {
1005         int     i, n;
1006         char   *p;
1007         char   *end;
1008
1009         static const struct {
1010                 const char *name;
1011                 uint32_t *flag;
1012         } options[] = {
1013                 { "extended", &aic7xxx_extended },
1014                 { "no_reset", &aic7xxx_no_reset },
1015                 { "verbose", &aic7xxx_verbose },
1016                 { "allow_memio", &aic7xxx_allow_memio},
1017 #ifdef AHC_DEBUG
1018                 { "debug", &ahc_debug },
1019 #endif
1020                 { "periodic_otag", &aic7xxx_periodic_otag },
1021                 { "pci_parity", &aic7xxx_pci_parity },
1022                 { "seltime", &aic7xxx_seltime },
1023                 { "tag_info", NULL },
1024                 { "global_tag_depth", NULL },
1025                 { "dv", NULL }
1026         };
1027
1028         end = strchr(s, '\0');
1029
1030         /*
1031          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1032          * will never be 0 in this case.
1033          */
1034         n = 0;
1035
1036         while ((p = strsep(&s, ",.")) != NULL) {
1037                 if (*p == '\0')
1038                         continue;
1039                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1040
1041                         n = strlen(options[i].name);
1042                         if (strncmp(options[i].name, p, n) == 0)
1043                                 break;
1044                 }
1045                 if (i == ARRAY_SIZE(options))
1046                         continue;
1047
1048                 if (strncmp(p, "global_tag_depth", n) == 0) {
1049                         ahc_linux_setup_tag_info_global(p + n);
1050                 } else if (strncmp(p, "tag_info", n) == 0) {
1051                         s = ahc_parse_brace_option("tag_info", p + n, end,
1052                             2, ahc_linux_setup_tag_info, 0);
1053                 } else if (p[n] == ':') {
1054                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1055                 } else if (strncmp(p, "verbose", n) == 0) {
1056                         *(options[i].flag) = 1;
1057                 } else {
1058                         *(options[i].flag) ^= 0xFFFFFFFF;
1059                 }
1060         }
1061         return 1;
1062 }
1063
1064 __setup("aic7xxx=", aic7xxx_setup);
1065
1066 uint32_t aic7xxx_verbose;
1067
1068 int
1069 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1070 {
1071         char    buf[80];
1072         struct  Scsi_Host *host;
1073         char    *new_name;
1074         u_long  s;
1075         int     retval;
1076
1077         template->name = ahc->description;
1078         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1079         if (host == NULL)
1080                 return (ENOMEM);
1081
1082         *((struct ahc_softc **)host->hostdata) = ahc;
1083         ahc->platform_data->host = host;
1084         host->can_queue = AHC_MAX_QUEUE;
1085         host->cmd_per_lun = 2;
1086         /* XXX No way to communicate the ID for multiple channels */
1087         host->this_id = ahc->our_id;
1088         host->irq = ahc->platform_data->irq;
1089         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1090         host->max_lun = AHC_NUM_LUNS;
1091         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1092         host->sg_tablesize = AHC_NSEG;
1093         ahc_lock(ahc, &s);
1094         ahc_set_unit(ahc, ahc_linux_unit++);
1095         ahc_unlock(ahc, &s);
1096         sprintf(buf, "scsi%d", host->host_no);
1097         new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1098         if (new_name != NULL) {
1099                 strcpy(new_name, buf);
1100                 ahc_set_name(ahc, new_name);
1101         }
1102         host->unique_id = ahc->unit;
1103         ahc_linux_initialize_scsi_bus(ahc);
1104         ahc_intr_enable(ahc, TRUE);
1105
1106         host->transportt = ahc_linux_transport_template;
1107
1108         retval = scsi_add_host(host, ahc->dev);
1109         if (retval) {
1110                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1111                 scsi_host_put(host);
1112                 return retval;
1113         }
1114
1115         scsi_scan_host(host);
1116         return 0;
1117 }
1118
1119 /*
1120  * Place the SCSI bus into a known state by either resetting it,
1121  * or forcing transfer negotiations on the next command to any
1122  * target.
1123  */
1124 static void
1125 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1126 {
1127         int i;
1128         int numtarg;
1129         unsigned long s;
1130
1131         i = 0;
1132         numtarg = 0;
1133
1134         ahc_lock(ahc, &s);
1135
1136         if (aic7xxx_no_reset != 0)
1137                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1138
1139         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1140                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1141         else
1142                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1143
1144         if ((ahc->features & AHC_TWIN) != 0) {
1145
1146                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1147                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1148                 } else {
1149                         if (numtarg == 0)
1150                                 i = 8;
1151                         numtarg += 8;
1152                 }
1153         }
1154
1155         /*
1156          * Force negotiation to async for all targets that
1157          * will not see an initial bus reset.
1158          */
1159         for (; i < numtarg; i++) {
1160                 struct ahc_devinfo devinfo;
1161                 struct ahc_initiator_tinfo *tinfo;
1162                 struct ahc_tmode_tstate *tstate;
1163                 u_int our_id;
1164                 u_int target_id;
1165                 char channel;
1166
1167                 channel = 'A';
1168                 our_id = ahc->our_id;
1169                 target_id = i;
1170                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1171                         channel = 'B';
1172                         our_id = ahc->our_id_b;
1173                         target_id = i % 8;
1174                 }
1175                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1176                                             target_id, &tstate);
1177                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1178                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1179                 ahc_update_neg_request(ahc, &devinfo, tstate,
1180                                        tinfo, AHC_NEG_ALWAYS);
1181         }
1182         ahc_unlock(ahc, &s);
1183         /* Give the bus some time to recover */
1184         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1185                 ahc_linux_freeze_simq(ahc);
1186                 msleep(AIC7XXX_RESET_DELAY);
1187                 ahc_linux_release_simq(ahc);
1188         }
1189 }
1190
1191 int
1192 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1193 {
1194
1195         ahc->platform_data =
1196             kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
1197         if (ahc->platform_data == NULL)
1198                 return (ENOMEM);
1199         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1200         ahc_lockinit(ahc);
1201         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1202         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1203         if (aic7xxx_pci_parity == 0)
1204                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1205
1206         return (0);
1207 }
1208
1209 void
1210 ahc_platform_free(struct ahc_softc *ahc)
1211 {
1212         struct scsi_target *starget;
1213         int i;
1214
1215         if (ahc->platform_data != NULL) {
1216                 /* destroy all of the device and target objects */
1217                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1218                         starget = ahc->platform_data->starget[i];
1219                         if (starget != NULL) {
1220                                 ahc->platform_data->starget[i] = NULL;
1221                         }
1222                 }
1223
1224                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1225                         free_irq(ahc->platform_data->irq, ahc);
1226                 if (ahc->tag == BUS_SPACE_PIO
1227                  && ahc->bsh.ioport != 0)
1228                         release_region(ahc->bsh.ioport, 256);
1229                 if (ahc->tag == BUS_SPACE_MEMIO
1230                  && ahc->bsh.maddr != NULL) {
1231                         iounmap(ahc->bsh.maddr);
1232                         release_mem_region(ahc->platform_data->mem_busaddr,
1233                                            0x1000);
1234                 }
1235
1236                 if (ahc->platform_data->host)
1237                         scsi_host_put(ahc->platform_data->host);
1238
1239                 kfree(ahc->platform_data);
1240         }
1241 }
1242
1243 void
1244 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1245 {
1246         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1247                                 SCB_GET_CHANNEL(ahc, scb),
1248                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1249                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1250 }
1251
1252 void
1253 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1254                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1255 {
1256         struct ahc_linux_device *dev;
1257         int was_queuing;
1258         int now_queuing;
1259
1260         if (sdev == NULL)
1261                 return;
1262         dev = scsi_transport_device_data(sdev);
1263
1264         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1265         switch (alg) {
1266         default:
1267         case AHC_QUEUE_NONE:
1268                 now_queuing = 0;
1269                 break;
1270         case AHC_QUEUE_BASIC:
1271                 now_queuing = AHC_DEV_Q_BASIC;
1272                 break;
1273         case AHC_QUEUE_TAGGED:
1274                 now_queuing = AHC_DEV_Q_TAGGED;
1275                 break;
1276         }
1277         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1278          && (was_queuing != now_queuing)
1279          && (dev->active != 0)) {
1280                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1281                 dev->qfrozen++;
1282         }
1283
1284         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1285         if (now_queuing) {
1286                 u_int usertags;
1287
1288                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1289                 if (!was_queuing) {
1290                         /*
1291                          * Start out aggressively and allow our
1292                          * dynamic queue depth algorithm to take
1293                          * care of the rest.
1294                          */
1295                         dev->maxtags = usertags;
1296                         dev->openings = dev->maxtags - dev->active;
1297                 }
1298                 if (dev->maxtags == 0) {
1299                         /*
1300                          * Queueing is disabled by the user.
1301                          */
1302                         dev->openings = 1;
1303                 } else if (alg == AHC_QUEUE_TAGGED) {
1304                         dev->flags |= AHC_DEV_Q_TAGGED;
1305                         if (aic7xxx_periodic_otag != 0)
1306                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1307                 } else
1308                         dev->flags |= AHC_DEV_Q_BASIC;
1309         } else {
1310                 /* We can only have one opening. */
1311                 dev->maxtags = 0;
1312                 dev->openings =  1 - dev->active;
1313         }
1314         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1315         case AHC_DEV_Q_BASIC:
1316         case AHC_DEV_Q_TAGGED:
1317                 scsi_change_queue_depth(sdev,
1318                                 dev->openings + dev->active);
1319                 break;
1320         default:
1321                 /*
1322                  * We allow the OS to queue 2 untagged transactions to
1323                  * us at any time even though we can only execute them
1324                  * serially on the controller/device.  This should
1325                  * remove some latency.
1326                  */
1327                 scsi_change_queue_depth(sdev, 2);
1328                 break;
1329         }
1330 }
1331
1332 int
1333 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1334                         int lun, u_int tag, role_t role, uint32_t status)
1335 {
1336         return 0;
1337 }
1338
1339 static u_int
1340 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1341 {
1342         static int warned_user;
1343         u_int tags;
1344
1345         tags = 0;
1346         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1347                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1348                         if (warned_user == 0) {
1349
1350                                 printk(KERN_WARNING
1351 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1352 "aic7xxx: for installed controllers. Using defaults\n"
1353 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1354 "aic7xxx: the aic7xxx_osm..c source file.\n");
1355                                 warned_user++;
1356                         }
1357                         tags = AHC_MAX_QUEUE;
1358                 } else {
1359                         adapter_tag_info_t *tag_info;
1360
1361                         tag_info = &aic7xxx_tag_info[ahc->unit];
1362                         tags = tag_info->tag_commands[devinfo->target_offset];
1363                         if (tags > AHC_MAX_QUEUE)
1364                                 tags = AHC_MAX_QUEUE;
1365                 }
1366         }
1367         return (tags);
1368 }
1369
1370 /*
1371  * Determines the queue depth for a given device.
1372  */
1373 static void
1374 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1375 {
1376         struct  ahc_devinfo devinfo;
1377         u_int   tags;
1378         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1379
1380         ahc_compile_devinfo(&devinfo,
1381                             sdev->sdev_target->channel == 0
1382                           ? ahc->our_id : ahc->our_id_b,
1383                             sdev->sdev_target->id, sdev->lun,
1384                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1385                             ROLE_INITIATOR);
1386         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1387         if (tags != 0 && sdev->tagged_supported != 0) {
1388
1389                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1390                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1391                                devinfo.lun, AC_TRANSFER_NEG);
1392                 ahc_print_devinfo(ahc, &devinfo);
1393                 printk("Tagged Queuing enabled.  Depth %d\n", tags);
1394         } else {
1395                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1396                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1397                                devinfo.lun, AC_TRANSFER_NEG);
1398         }
1399 }
1400
1401 static int
1402 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1403                       struct scsi_cmnd *cmd)
1404 {
1405         struct   scb *scb;
1406         struct   hardware_scb *hscb;
1407         struct   ahc_initiator_tinfo *tinfo;
1408         struct   ahc_tmode_tstate *tstate;
1409         uint16_t mask;
1410         struct scb_tailq *untagged_q = NULL;
1411         int nseg;
1412
1413         /*
1414          * Schedule us to run later.  The only reason we are not
1415          * running is because the whole controller Q is frozen.
1416          */
1417         if (ahc->platform_data->qfrozen != 0)
1418                 return SCSI_MLQUEUE_HOST_BUSY;
1419
1420         /*
1421          * We only allow one untagged transaction
1422          * per target in the initiator role unless
1423          * we are storing a full busy target *lun*
1424          * table in SCB space.
1425          */
1426         if (!(cmd->flags & SCMD_TAGGED)
1427             && (ahc->features & AHC_SCB_BTT) == 0) {
1428                 int target_offset;
1429
1430                 target_offset = cmd->device->id + cmd->device->channel * 8;
1431                 untagged_q = &(ahc->untagged_queues[target_offset]);
1432                 if (!TAILQ_EMPTY(untagged_q))
1433                         /* if we're already executing an untagged command
1434                          * we're busy to another */
1435                         return SCSI_MLQUEUE_DEVICE_BUSY;
1436         }
1437
1438         nseg = scsi_dma_map(cmd);
1439         if (nseg < 0)
1440                 return SCSI_MLQUEUE_HOST_BUSY;
1441
1442         /*
1443          * Get an scb to use.
1444          */
1445         scb = ahc_get_scb(ahc);
1446         if (!scb) {
1447                 scsi_dma_unmap(cmd);
1448                 return SCSI_MLQUEUE_HOST_BUSY;
1449         }
1450
1451         scb->io_ctx = cmd;
1452         scb->platform_data->dev = dev;
1453         hscb = scb->hscb;
1454         cmd->host_scribble = (char *)scb;
1455
1456         /*
1457          * Fill out basics of the HSCB.
1458          */
1459         hscb->control = 0;
1460         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1461         hscb->lun = cmd->device->lun;
1462         mask = SCB_GET_TARGET_MASK(ahc, scb);
1463         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1464                                     SCB_GET_OUR_ID(scb),
1465                                     SCB_GET_TARGET(ahc, scb), &tstate);
1466         hscb->scsirate = tinfo->scsirate;
1467         hscb->scsioffset = tinfo->curr.offset;
1468         if ((tstate->ultraenb & mask) != 0)
1469                 hscb->control |= ULTRAENB;
1470
1471         if ((ahc->user_discenable & mask) != 0)
1472                 hscb->control |= DISCENB;
1473
1474         if ((tstate->auto_negotiate & mask) != 0) {
1475                 scb->flags |= SCB_AUTO_NEGOTIATE;
1476                 scb->hscb->control |= MK_MESSAGE;
1477         }
1478
1479         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1480                 if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1481                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1482                         hscb->control |= ORDERED_QUEUE_TAG;
1483                         dev->commands_since_idle_or_otag = 0;
1484                 } else {
1485                         hscb->control |= SIMPLE_QUEUE_TAG;
1486                 }
1487         }
1488
1489         hscb->cdb_len = cmd->cmd_len;
1490         if (hscb->cdb_len <= 12) {
1491                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1492         } else {
1493                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1494                 scb->flags |= SCB_CDB32_PTR;
1495         }
1496
1497         scb->platform_data->xfer_len = 0;
1498         ahc_set_residual(scb, 0);
1499         ahc_set_sense_residual(scb, 0);
1500         scb->sg_count = 0;
1501
1502         if (nseg > 0) {
1503                 struct  ahc_dma_seg *sg;
1504                 struct  scatterlist *cur_seg;
1505                 int i;
1506
1507                 /* Copy the segments into the SG list. */
1508                 sg = scb->sg_list;
1509                 /*
1510                  * The sg_count may be larger than nseg if
1511                  * a transfer crosses a 32bit page.
1512                  */
1513                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1514                         dma_addr_t addr;
1515                         bus_size_t len;
1516                         int consumed;
1517
1518                         addr = sg_dma_address(cur_seg);
1519                         len = sg_dma_len(cur_seg);
1520                         consumed = ahc_linux_map_seg(ahc, scb,
1521                                                      sg, addr, len);
1522                         sg += consumed;
1523                         scb->sg_count += consumed;
1524                 }
1525                 sg--;
1526                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1527
1528                 /*
1529                  * Reset the sg list pointer.
1530                  */
1531                 scb->hscb->sgptr =
1532                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1533
1534                 /*
1535                  * Copy the first SG into the "current"
1536                  * data pointer area.
1537                  */
1538                 scb->hscb->dataptr = scb->sg_list->addr;
1539                 scb->hscb->datacnt = scb->sg_list->len;
1540         } else {
1541                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1542                 scb->hscb->dataptr = 0;
1543                 scb->hscb->datacnt = 0;
1544                 scb->sg_count = 0;
1545         }
1546
1547         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1548         dev->openings--;
1549         dev->active++;
1550         dev->commands_issued++;
1551         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1552                 dev->commands_since_idle_or_otag++;
1553
1554         scb->flags |= SCB_ACTIVE;
1555         if (untagged_q) {
1556                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1557                 scb->flags |= SCB_UNTAGGEDQ;
1558         }
1559         ahc_queue_scb(ahc, scb);
1560         return 0;
1561 }
1562
1563 /*
1564  * SCSI controller interrupt handler.
1565  */
1566 irqreturn_t
1567 ahc_linux_isr(int irq, void *dev_id)
1568 {
1569         struct  ahc_softc *ahc;
1570         u_long  flags;
1571         int     ours;
1572
1573         ahc = (struct ahc_softc *) dev_id;
1574         ahc_lock(ahc, &flags);
1575         ours = ahc_intr(ahc);
1576         ahc_unlock(ahc, &flags);
1577         return IRQ_RETVAL(ours);
1578 }
1579
1580 void
1581 ahc_platform_flushwork(struct ahc_softc *ahc)
1582 {
1583
1584 }
1585
1586 void
1587 ahc_send_async(struct ahc_softc *ahc, char channel,
1588                u_int target, u_int lun, ac_code code)
1589 {
1590         switch (code) {
1591         case AC_TRANSFER_NEG:
1592         {
1593                 struct  scsi_target *starget;
1594                 struct  ahc_initiator_tinfo *tinfo;
1595                 struct  ahc_tmode_tstate *tstate;
1596                 int     target_offset;
1597                 unsigned int target_ppr_options;
1598
1599                 BUG_ON(target == CAM_TARGET_WILDCARD);
1600
1601                 tinfo = ahc_fetch_transinfo(ahc, channel,
1602                                                 channel == 'A' ? ahc->our_id
1603                                                                : ahc->our_id_b,
1604                                                 target, &tstate);
1605
1606                 /*
1607                  * Don't bother reporting results while
1608                  * negotiations are still pending.
1609                  */
1610                 if (tinfo->curr.period != tinfo->goal.period
1611                  || tinfo->curr.width != tinfo->goal.width
1612                  || tinfo->curr.offset != tinfo->goal.offset
1613                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1614                         if (bootverbose == 0)
1615                                 break;
1616
1617                 /*
1618                  * Don't bother reporting results that
1619                  * are identical to those last reported.
1620                  */
1621                 target_offset = target;
1622                 if (channel == 'B')
1623                         target_offset += 8;
1624                 starget = ahc->platform_data->starget[target_offset];
1625                 if (starget == NULL)
1626                         break;
1627
1628                 target_ppr_options =
1629                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1630                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1631                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1632
1633                 if (tinfo->curr.period == spi_period(starget)
1634                     && tinfo->curr.width == spi_width(starget)
1635                     && tinfo->curr.offset == spi_offset(starget)
1636                  && tinfo->curr.ppr_options == target_ppr_options)
1637                         if (bootverbose == 0)
1638                                 break;
1639
1640                 spi_period(starget) = tinfo->curr.period;
1641                 spi_width(starget) = tinfo->curr.width;
1642                 spi_offset(starget) = tinfo->curr.offset;
1643                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1644                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1645                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1646                 spi_display_xfer_agreement(starget);
1647                 break;
1648         }
1649         case AC_SENT_BDR:
1650         {
1651                 WARN_ON(lun != CAM_LUN_WILDCARD);
1652                 scsi_report_device_reset(ahc->platform_data->host,
1653                                          channel - 'A', target);
1654                 break;
1655         }
1656         case AC_BUS_RESET:
1657                 if (ahc->platform_data->host != NULL) {
1658                         scsi_report_bus_reset(ahc->platform_data->host,
1659                                               channel - 'A');
1660                 }
1661                 break;
1662         default:
1663                 panic("ahc_send_async: Unexpected async event");
1664         }
1665 }
1666
1667 /*
1668  * Calls the higher level scsi done function and frees the scb.
1669  */
1670 void
1671 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1672 {
1673         struct scsi_cmnd *cmd;
1674         struct     ahc_linux_device *dev;
1675
1676         LIST_REMOVE(scb, pending_links);
1677         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1678                 struct scb_tailq *untagged_q;
1679                 int target_offset;
1680
1681                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1682                 untagged_q = &(ahc->untagged_queues[target_offset]);
1683                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1684                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1685         } else if ((scb->flags & SCB_ACTIVE) == 0) {
1686                 /*
1687                  * Transactions aborted from the untagged queue may
1688                  * not have been dispatched to the controller, so
1689                  * only check the SCB_ACTIVE flag for tagged transactions.
1690                  */
1691                 printk("SCB %d done'd twice\n", scb->hscb->tag);
1692                 ahc_dump_card_state(ahc);
1693                 panic("Stopping for safety");
1694         }
1695         cmd = scb->io_ctx;
1696         dev = scb->platform_data->dev;
1697         dev->active--;
1698         dev->openings++;
1699         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1700                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1701                 dev->qfrozen--;
1702         }
1703         ahc_linux_unmap_scb(ahc, scb);
1704
1705         /*
1706          * Guard against stale sense data.
1707          * The Linux mid-layer assumes that sense
1708          * was retrieved anytime the first byte of
1709          * the sense buffer looks "sane".
1710          */
1711         cmd->sense_buffer[0] = 0;
1712         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1713 #ifdef AHC_REPORT_UNDERFLOWS
1714                 uint32_t amount_xferred;
1715
1716                 amount_xferred =
1717                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1718 #endif
1719                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1720 #ifdef AHC_DEBUG
1721                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1722                                 ahc_print_path(ahc, scb);
1723                                 printk("Set CAM_UNCOR_PARITY\n");
1724                         }
1725 #endif
1726                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1727 #ifdef AHC_REPORT_UNDERFLOWS
1728                 /*
1729                  * This code is disabled by default as some
1730                  * clients of the SCSI system do not properly
1731                  * initialize the underflow parameter.  This
1732                  * results in spurious termination of commands
1733                  * that complete as expected (e.g. underflow is
1734                  * allowed as command can return variable amounts
1735                  * of data.
1736                  */
1737                 } else if (amount_xferred < scb->io_ctx->underflow) {
1738                         u_int i;
1739
1740                         ahc_print_path(ahc, scb);
1741                         printk("CDB:");
1742                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1743                                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
1744                         printk("\n");
1745                         ahc_print_path(ahc, scb);
1746                         printk("Saw underflow (%ld of %ld bytes). "
1747                                "Treated as error\n",
1748                                 ahc_get_residual(scb),
1749                                 ahc_get_transfer_length(scb));
1750                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1751 #endif
1752                 } else {
1753                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1754                 }
1755         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1756                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1757         }
1758
1759         if (dev->openings == 1
1760          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1761          && ahc_get_scsi_status(scb) != SAM_STAT_TASK_SET_FULL)
1762                 dev->tag_success_count++;
1763         /*
1764          * Some devices deal with temporary internal resource
1765          * shortages by returning queue full.  When the queue
1766          * full occurrs, we throttle back.  Slowly try to get
1767          * back to our previous queue depth.
1768          */
1769         if ((dev->openings + dev->active) < dev->maxtags
1770          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1771                 dev->tag_success_count = 0;
1772                 dev->openings++;
1773         }
1774
1775         if (dev->active == 0)
1776                 dev->commands_since_idle_or_otag = 0;
1777
1778         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1779                 printk("Recovery SCB completes\n");
1780                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1781                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1782                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1783
1784                 if (ahc->platform_data->eh_done)
1785                         complete(ahc->platform_data->eh_done);
1786         }
1787
1788         ahc_free_scb(ahc, scb);
1789         ahc_linux_queue_cmd_complete(ahc, cmd);
1790 }
1791
1792 static void
1793 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1794                              struct scsi_device *sdev, struct scb *scb)
1795 {
1796         struct  ahc_devinfo devinfo;
1797         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1798
1799         ahc_compile_devinfo(&devinfo,
1800                             ahc->our_id,
1801                             sdev->sdev_target->id, sdev->lun,
1802                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1803                             ROLE_INITIATOR);
1804
1805         /*
1806          * We don't currently trust the mid-layer to
1807          * properly deal with queue full or busy.  So,
1808          * when one occurs, we tell the mid-layer to
1809          * unconditionally requeue the command to us
1810          * so that we can retry it ourselves.  We also
1811          * implement our own throttling mechanism so
1812          * we don't clobber the device with too many
1813          * commands.
1814          */
1815         switch (ahc_get_scsi_status(scb)) {
1816         default:
1817                 break;
1818         case SAM_STAT_CHECK_CONDITION:
1819         case SAM_STAT_COMMAND_TERMINATED:
1820         {
1821                 struct scsi_cmnd *cmd;
1822
1823                 /*
1824                  * Copy sense information to the OS's cmd
1825                  * structure if it is available.
1826                  */
1827                 cmd = scb->io_ctx;
1828                 if (scb->flags & SCB_SENSE) {
1829                         u_int sense_size;
1830
1831                         sense_size = min(sizeof(struct scsi_sense_data)
1832                                        - ahc_get_sense_residual(scb),
1833                                          (u_long)SCSI_SENSE_BUFFERSIZE);
1834                         memcpy(cmd->sense_buffer,
1835                                ahc_get_sense_buf(ahc, scb), sense_size);
1836                         if (sense_size < SCSI_SENSE_BUFFERSIZE)
1837                                 memset(&cmd->sense_buffer[sense_size], 0,
1838                                        SCSI_SENSE_BUFFERSIZE - sense_size);
1839 #ifdef AHC_DEBUG
1840                         if (ahc_debug & AHC_SHOW_SENSE) {
1841                                 int i;
1842
1843                                 printk("Copied %d bytes of sense data:",
1844                                        sense_size);
1845                                 for (i = 0; i < sense_size; i++) {
1846                                         if ((i & 0xF) == 0)
1847                                                 printk("\n");
1848                                         printk("0x%x ", cmd->sense_buffer[i]);
1849                                 }
1850                                 printk("\n");
1851                         }
1852 #endif
1853                 }
1854                 break;
1855         }
1856         case SAM_STAT_TASK_SET_FULL:
1857         {
1858                 /*
1859                  * By the time the core driver has returned this
1860                  * command, all other commands that were queued
1861                  * to us but not the device have been returned.
1862                  * This ensures that dev->active is equal to
1863                  * the number of commands actually queued to
1864                  * the device.
1865                  */
1866                 dev->tag_success_count = 0;
1867                 if (dev->active != 0) {
1868                         /*
1869                          * Drop our opening count to the number
1870                          * of commands currently outstanding.
1871                          */
1872                         dev->openings = 0;
1873 /*
1874                         ahc_print_path(ahc, scb);
1875                         printk("Dropping tag count to %d\n", dev->active);
1876  */
1877                         if (dev->active == dev->tags_on_last_queuefull) {
1878
1879                                 dev->last_queuefull_same_count++;
1880                                 /*
1881                                  * If we repeatedly see a queue full
1882                                  * at the same queue depth, this
1883                                  * device has a fixed number of tag
1884                                  * slots.  Lock in this tag depth
1885                                  * so we stop seeing queue fulls from
1886                                  * this device.
1887                                  */
1888                                 if (dev->last_queuefull_same_count
1889                                  == AHC_LOCK_TAGS_COUNT) {
1890                                         dev->maxtags = dev->active;
1891                                         ahc_print_path(ahc, scb);
1892                                         printk("Locking max tag count at %d\n",
1893                                                dev->active);
1894                                 }
1895                         } else {
1896                                 dev->tags_on_last_queuefull = dev->active;
1897                                 dev->last_queuefull_same_count = 0;
1898                         }
1899                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1900                         ahc_set_scsi_status(scb, SAM_STAT_GOOD);
1901                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1902                                      (dev->flags & AHC_DEV_Q_BASIC)
1903                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1904                         break;
1905                 }
1906                 /*
1907                  * Drop down to a single opening, and treat this
1908                  * as if the target returned BUSY SCSI status.
1909                  */
1910                 dev->openings = 1;
1911                 ahc_set_scsi_status(scb, SAM_STAT_BUSY);
1912                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1913                              (dev->flags & AHC_DEV_Q_BASIC)
1914                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1915                 break;
1916         }
1917         }
1918 }
1919
1920 static void
1921 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1922 {
1923         /*
1924          * Map CAM error codes into Linux Error codes.  We
1925          * avoid the conversion so that the DV code has the
1926          * full error information available when making
1927          * state change decisions.
1928          */
1929         {
1930                 u_int new_status;
1931
1932                 switch (ahc_cmd_get_transaction_status(cmd)) {
1933                 case CAM_REQ_INPROG:
1934                 case CAM_REQ_CMP:
1935                 case CAM_SCSI_STATUS_ERROR:
1936                         new_status = DID_OK;
1937                         break;
1938                 case CAM_REQ_ABORTED:
1939                         new_status = DID_ABORT;
1940                         break;
1941                 case CAM_BUSY:
1942                         new_status = DID_BUS_BUSY;
1943                         break;
1944                 case CAM_REQ_INVALID:
1945                 case CAM_PATH_INVALID:
1946                         new_status = DID_BAD_TARGET;
1947                         break;
1948                 case CAM_SEL_TIMEOUT:
1949                         new_status = DID_NO_CONNECT;
1950                         break;
1951                 case CAM_SCSI_BUS_RESET:
1952                 case CAM_BDR_SENT:
1953                         new_status = DID_RESET;
1954                         break;
1955                 case CAM_UNCOR_PARITY:
1956                         new_status = DID_PARITY;
1957                         break;
1958                 case CAM_CMD_TIMEOUT:
1959                         new_status = DID_TIME_OUT;
1960                         break;
1961                 case CAM_UA_ABORT:
1962                 case CAM_REQ_CMP_ERR:
1963                 case CAM_AUTOSENSE_FAIL:
1964                 case CAM_NO_HBA:
1965                 case CAM_DATA_RUN_ERR:
1966                 case CAM_UNEXP_BUSFREE:
1967                 case CAM_SEQUENCE_FAIL:
1968                 case CAM_CCB_LEN_ERR:
1969                 case CAM_PROVIDE_FAIL:
1970                 case CAM_REQ_TERMIO:
1971                 case CAM_UNREC_HBA_ERROR:
1972                 case CAM_REQ_TOO_BIG:
1973                         new_status = DID_ERROR;
1974                         break;
1975                 case CAM_REQUEUE_REQ:
1976                         new_status = DID_REQUEUE;
1977                         break;
1978                 default:
1979                         /* We should never get here */
1980                         new_status = DID_ERROR;
1981                         break;
1982                 }
1983
1984                 ahc_cmd_set_transaction_status(cmd, new_status);
1985         }
1986
1987         scsi_done(cmd);
1988 }
1989
1990 static void
1991 ahc_linux_freeze_simq(struct ahc_softc *ahc)
1992 {
1993         unsigned long s;
1994
1995         ahc_lock(ahc, &s);
1996         ahc->platform_data->qfrozen++;
1997         if (ahc->platform_data->qfrozen == 1) {
1998                 scsi_block_requests(ahc->platform_data->host);
1999
2000                 /* XXX What about Twin channels? */
2001                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2002                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2003                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2004         }
2005         ahc_unlock(ahc, &s);
2006 }
2007
2008 static void
2009 ahc_linux_release_simq(struct ahc_softc *ahc)
2010 {
2011         u_long s;
2012         int    unblock_reqs;
2013
2014         unblock_reqs = 0;
2015         ahc_lock(ahc, &s);
2016         if (ahc->platform_data->qfrozen > 0)
2017                 ahc->platform_data->qfrozen--;
2018         if (ahc->platform_data->qfrozen == 0)
2019                 unblock_reqs = 1;
2020         ahc_unlock(ahc, &s);
2021         /*
2022          * There is still a race here.  The mid-layer
2023          * should keep its own freeze count and use
2024          * a bottom half handler to run the queues
2025          * so we can unblock with our own lock held.
2026          */
2027         if (unblock_reqs)
2028                 scsi_unblock_requests(ahc->platform_data->host);
2029 }
2030
2031 static int
2032 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2033 {
2034         struct ahc_softc *ahc;
2035         struct ahc_linux_device *dev;
2036         struct scb *pending_scb;
2037         u_int  saved_scbptr;
2038         u_int  active_scb_index;
2039         u_int  last_phase;
2040         u_int  saved_scsiid;
2041         u_int  cdb_byte;
2042         int    retval;
2043         int    was_paused;
2044         int    paused;
2045         int    wait;
2046         int    disconnected;
2047         unsigned long flags;
2048
2049         pending_scb = NULL;
2050         paused = FALSE;
2051         wait = FALSE;
2052         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2053
2054         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2055                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2056
2057         printk("CDB:");
2058         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2059                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
2060         printk("\n");
2061
2062         ahc_lock(ahc, &flags);
2063
2064         /*
2065          * First determine if we currently own this command.
2066          * Start by searching the device queue.  If not found
2067          * there, check the pending_scb list.  If not found
2068          * at all, and the system wanted us to just abort the
2069          * command, return success.
2070          */
2071         dev = scsi_transport_device_data(cmd->device);
2072
2073         if (dev == NULL) {
2074                 /*
2075                  * No target device for this command exists,
2076                  * so we must not still own the command.
2077                  */
2078                 printk("%s:%d:%d:%d: Is not an active device\n",
2079                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2080                        (u8)cmd->device->lun);
2081                 retval = SUCCESS;
2082                 goto no_cmd;
2083         }
2084
2085         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2086          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2087                                        cmd->device->channel + 'A',
2088                                        (u8)cmd->device->lun,
2089                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2090                 printk("%s:%d:%d:%d: Command found on untagged queue\n",
2091                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2092                        (u8)cmd->device->lun);
2093                 retval = SUCCESS;
2094                 goto done;
2095         }
2096
2097         /*
2098          * See if we can find a matching cmd in the pending list.
2099          */
2100         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2101                 if (pending_scb->io_ctx == cmd)
2102                         break;
2103         }
2104
2105         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2106
2107                 /* Any SCB for this device will do for a target reset */
2108                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2109                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2110                                           scmd_channel(cmd) + 'A',
2111                                           CAM_LUN_WILDCARD,
2112                                           SCB_LIST_NULL, ROLE_INITIATOR))
2113                                 break;
2114                 }
2115         }
2116
2117         if (pending_scb == NULL) {
2118                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2119                 goto no_cmd;
2120         }
2121
2122         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2123                 /*
2124                  * We can't queue two recovery actions using the same SCB
2125                  */
2126                 retval = FAILED;
2127                 goto  done;
2128         }
2129
2130         /*
2131          * Ensure that the card doesn't do anything
2132          * behind our back and that we didn't "just" miss
2133          * an interrupt that would affect this cmd.
2134          */
2135         was_paused = ahc_is_paused(ahc);
2136         ahc_pause_and_flushwork(ahc);
2137         paused = TRUE;
2138
2139         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2140                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2141                 goto no_cmd;
2142         }
2143
2144         printk("%s: At time of recovery, card was %spaused\n",
2145                ahc_name(ahc), was_paused ? "" : "not ");
2146         ahc_dump_card_state(ahc);
2147
2148         disconnected = TRUE;
2149         if (flag == SCB_ABORT) {
2150                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2151                                        cmd->device->channel + 'A',
2152                                        cmd->device->lun,
2153                                        pending_scb->hscb->tag,
2154                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2155                                        SEARCH_COMPLETE) > 0) {
2156                         printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2157                                ahc_name(ahc), cmd->device->channel,
2158                                cmd->device->id, (u8)cmd->device->lun);
2159                         retval = SUCCESS;
2160                         goto done;
2161                 }
2162         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2163                                       cmd->device->channel + 'A',
2164                                       cmd->device->lun,
2165                                       pending_scb->hscb->tag,
2166                                       ROLE_INITIATOR, /*status*/0,
2167                                       SEARCH_COUNT) > 0) {
2168                 disconnected = FALSE;
2169         }
2170
2171         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2172                 struct scb *bus_scb;
2173
2174                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2175                 if (bus_scb == pending_scb)
2176                         disconnected = FALSE;
2177                 else if (flag != SCB_ABORT
2178                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2179                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2180                         disconnected = FALSE;
2181         }
2182
2183         /*
2184          * At this point, pending_scb is the scb associated with the
2185          * passed in command.  That command is currently active on the
2186          * bus, is in the disconnected state, or we're hoping to find
2187          * a command for the same target active on the bus to abuse to
2188          * send a BDR.  Queue the appropriate message based on which of
2189          * these states we are in.
2190          */
2191         last_phase = ahc_inb(ahc, LASTPHASE);
2192         saved_scbptr = ahc_inb(ahc, SCBPTR);
2193         active_scb_index = ahc_inb(ahc, SCB_TAG);
2194         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2195         if (last_phase != P_BUSFREE
2196          && (pending_scb->hscb->tag == active_scb_index
2197           || (flag == SCB_DEVICE_RESET
2198            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2199
2200                 /*
2201                  * We're active on the bus, so assert ATN
2202                  * and hope that the target responds.
2203                  */
2204                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2205                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2206                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2207                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2208                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2209                 wait = TRUE;
2210         } else if (disconnected) {
2211
2212                 /*
2213                  * Actually re-queue this SCB in an attempt
2214                  * to select the device before it reconnects.
2215                  * In either case (selection or reselection),
2216                  * we will now issue the approprate message
2217                  * to the timed-out device.
2218                  *
2219                  * Set the MK_MESSAGE control bit indicating
2220                  * that we desire to send a message.  We
2221                  * also set the disconnected flag since
2222                  * in the paging case there is no guarantee
2223                  * that our SCB control byte matches the
2224                  * version on the card.  We don't want the
2225                  * sequencer to abort the command thinking
2226                  * an unsolicited reselection occurred.
2227                  */
2228                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2229                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2230
2231                 /*
2232                  * Remove any cached copy of this SCB in the
2233                  * disconnected list in preparation for the
2234                  * queuing of our abort SCB.  We use the
2235                  * same element in the SCB, SCB_NEXT, for
2236                  * both the qinfifo and the disconnected list.
2237                  */
2238                 ahc_search_disc_list(ahc, cmd->device->id,
2239                                      cmd->device->channel + 'A',
2240                                      cmd->device->lun, pending_scb->hscb->tag,
2241                                      /*stop_on_first*/TRUE,
2242                                      /*remove*/TRUE,
2243                                      /*save_state*/FALSE);
2244
2245                 /*
2246                  * In the non-paging case, the sequencer will
2247                  * never re-reference the in-core SCB.
2248                  * To make sure we are notified during
2249                  * reselection, set the MK_MESSAGE flag in
2250                  * the card's copy of the SCB.
2251                  */
2252                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2253                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2254                         ahc_outb(ahc, SCB_CONTROL,
2255                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2256                 }
2257
2258                 /*
2259                  * Clear out any entries in the QINFIFO first
2260                  * so we are the next SCB for this target
2261                  * to run.
2262                  */
2263                 ahc_search_qinfifo(ahc, cmd->device->id,
2264                                    cmd->device->channel + 'A',
2265                                    cmd->device->lun, SCB_LIST_NULL,
2266                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2267                                    SEARCH_COMPLETE);
2268                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2269                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2270                 ahc_print_path(ahc, pending_scb);
2271                 printk("Device is disconnected, re-queuing SCB\n");
2272                 wait = TRUE;
2273         } else {
2274                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2275                 retval = FAILED;
2276                 goto done;
2277         }
2278
2279 no_cmd:
2280         /*
2281          * Our assumption is that if we don't have the command, no
2282          * recovery action was required, so we return success.  Again,
2283          * the semantics of the mid-layer recovery engine are not
2284          * well defined, so this may change in time.
2285          */
2286         retval = SUCCESS;
2287 done:
2288         if (paused)
2289                 ahc_unpause(ahc);
2290         if (wait) {
2291                 DECLARE_COMPLETION_ONSTACK(done);
2292
2293                 ahc->platform_data->eh_done = &done;
2294                 ahc_unlock(ahc, &flags);
2295
2296                 printk("Recovery code sleeping\n");
2297                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2298                         ahc_lock(ahc, &flags);
2299                         ahc->platform_data->eh_done = NULL;
2300                         ahc_unlock(ahc, &flags);
2301
2302                         printk("Timer Expired\n");
2303                         retval = FAILED;
2304                 }
2305                 printk("Recovery code awake\n");
2306         } else
2307                 ahc_unlock(ahc, &flags);
2308         return (retval);
2309 }
2310
2311 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2312 {
2313         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2314         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2315         struct ahc_devinfo devinfo;
2316         unsigned long flags;
2317
2318         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2319                             starget->channel + 'A', ROLE_INITIATOR);
2320         ahc_lock(ahc, &flags);
2321         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2322         ahc_unlock(ahc, &flags);
2323 }
2324
2325 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2326 {
2327         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2328         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2329         struct ahc_tmode_tstate *tstate;
2330         struct ahc_initiator_tinfo *tinfo
2331                 = ahc_fetch_transinfo(ahc,
2332                                       starget->channel + 'A',
2333                                       shost->this_id, starget->id, &tstate);
2334         struct ahc_devinfo devinfo;
2335         unsigned int ppr_options = tinfo->goal.ppr_options;
2336         unsigned long flags;
2337         unsigned long offset = tinfo->goal.offset;
2338         const struct ahc_syncrate *syncrate;
2339
2340         if (offset == 0)
2341                 offset = MAX_OFFSET;
2342
2343         if (period < 9)
2344                 period = 9;     /* 12.5ns is our minimum */
2345         if (period == 9) {
2346                 if (spi_max_width(starget))
2347                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2348                 else
2349                         /* need wide for DT and need DT for 12.5 ns */
2350                         period = 10;
2351         }
2352
2353         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2354                             starget->channel + 'A', ROLE_INITIATOR);
2355
2356         /* all PPR requests apart from QAS require wide transfers */
2357         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2358                 if (spi_width(starget) == 0)
2359                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2360         }
2361
2362         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2363                                      AHC_SYNCRATE_DT);
2364         ahc_lock(ahc, &flags);
2365         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2366                          ppr_options, AHC_TRANS_GOAL, FALSE);
2367         ahc_unlock(ahc, &flags);
2368 }
2369
2370 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2371 {
2372         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2373         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2374         struct ahc_tmode_tstate *tstate;
2375         struct ahc_initiator_tinfo *tinfo
2376                 = ahc_fetch_transinfo(ahc,
2377                                       starget->channel + 'A',
2378                                       shost->this_id, starget->id, &tstate);
2379         struct ahc_devinfo devinfo;
2380         unsigned int ppr_options = 0;
2381         unsigned int period = 0;
2382         unsigned long flags;
2383         const struct ahc_syncrate *syncrate = NULL;
2384
2385         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2386                             starget->channel + 'A', ROLE_INITIATOR);
2387         if (offset != 0) {
2388                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2389                                              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,
2426                                      AHC_SYNCRATE_DT);
2427         ahc_lock(ahc, &flags);
2428         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2429                          ppr_options, AHC_TRANS_GOAL, FALSE);
2430         ahc_unlock(ahc, &flags);
2431 }
2432
2433 #if 0
2434 /* FIXME: This code claims to support IU and QAS.  However, the actual
2435  * sequencer code and aic7xxx_core have no support for these parameters and
2436  * will get into a bad state if they're negotiated.  Do not enable this
2437  * unless you know what you're doing */
2438 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2439 {
2440         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2441         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2442         struct ahc_tmode_tstate *tstate;
2443         struct ahc_initiator_tinfo *tinfo
2444                 = ahc_fetch_transinfo(ahc,
2445                                       starget->channel + 'A',
2446                                       shost->this_id, starget->id, &tstate);
2447         struct ahc_devinfo devinfo;
2448         unsigned int ppr_options = tinfo->goal.ppr_options
2449                 & ~MSG_EXT_PPR_QAS_REQ;
2450         unsigned int period = tinfo->goal.period;
2451         unsigned long flags;
2452         struct ahc_syncrate *syncrate;
2453
2454         if (qas)
2455                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2456
2457         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2458                             starget->channel + 'A', ROLE_INITIATOR);
2459         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2460                                      AHC_SYNCRATE_DT);
2461         ahc_lock(ahc, &flags);
2462         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2463                          ppr_options, AHC_TRANS_GOAL, FALSE);
2464         ahc_unlock(ahc, &flags);
2465 }
2466
2467 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2468 {
2469         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2470         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2471         struct ahc_tmode_tstate *tstate;
2472         struct ahc_initiator_tinfo *tinfo
2473                 = ahc_fetch_transinfo(ahc,
2474                                       starget->channel + 'A',
2475                                       shost->this_id, starget->id, &tstate);
2476         struct ahc_devinfo devinfo;
2477         unsigned int ppr_options = tinfo->goal.ppr_options
2478                 & ~MSG_EXT_PPR_IU_REQ;
2479         unsigned int period = tinfo->goal.period;
2480         unsigned long flags;
2481         struct ahc_syncrate *syncrate;
2482
2483         if (iu)
2484                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2485
2486         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2487                             starget->channel + 'A', ROLE_INITIATOR);
2488         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2489                                      AHC_SYNCRATE_DT);
2490         ahc_lock(ahc, &flags);
2491         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2492                          ppr_options, AHC_TRANS_GOAL, FALSE);
2493         ahc_unlock(ahc, &flags);
2494 }
2495 #endif
2496
2497 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2498 {
2499         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2500         unsigned long flags;
2501         u8 mode;
2502
2503         if (!(ahc->features & AHC_ULTRA2)) {
2504                 /* non-LVD chipset, may not have SBLKCTL reg */
2505                 spi_signalling(shost) =
2506                         ahc->features & AHC_HVD ?
2507                         SPI_SIGNAL_HVD :
2508                         SPI_SIGNAL_SE;
2509                 return;
2510         }
2511
2512         ahc_lock(ahc, &flags);
2513         ahc_pause(ahc);
2514         mode = ahc_inb(ahc, SBLKCTL);
2515         ahc_unpause(ahc);
2516         ahc_unlock(ahc, &flags);
2517
2518         if (mode & ENAB40)
2519                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2520         else if (mode & ENAB20)
2521                 spi_signalling(shost) = SPI_SIGNAL_SE;
2522         else
2523                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2524 }
2525
2526 static struct spi_function_template ahc_linux_transport_functions = {
2527         .set_offset     = ahc_linux_set_offset,
2528         .show_offset    = 1,
2529         .set_period     = ahc_linux_set_period,
2530         .show_period    = 1,
2531         .set_width      = ahc_linux_set_width,
2532         .show_width     = 1,
2533         .set_dt         = ahc_linux_set_dt,
2534         .show_dt        = 1,
2535 #if 0
2536         .set_iu         = ahc_linux_set_iu,
2537         .show_iu        = 1,
2538         .set_qas        = ahc_linux_set_qas,
2539         .show_qas       = 1,
2540 #endif
2541         .get_signalling = ahc_linux_get_signalling,
2542 };
2543
2544
2545
2546 static int __init
2547 ahc_linux_init(void)
2548 {
2549         /*
2550          * If we've been passed any parameters, process them now.
2551          */
2552         if (aic7xxx)
2553                 aic7xxx_setup(aic7xxx);
2554
2555         ahc_linux_transport_template =
2556                 spi_attach_transport(&ahc_linux_transport_functions);
2557         if (!ahc_linux_transport_template)
2558                 return -ENODEV;
2559
2560         scsi_transport_reserve_device(ahc_linux_transport_template,
2561                                       sizeof(struct ahc_linux_device));
2562
2563         ahc_linux_pci_init();
2564         ahc_linux_eisa_init();
2565         return 0;
2566 }
2567
2568 static void
2569 ahc_linux_exit(void)
2570 {
2571         ahc_linux_pci_exit();
2572         ahc_linux_eisa_exit();
2573         spi_release_transport(ahc_linux_transport_template);
2574 }
2575
2576 module_init(ahc_linux_init);
2577 module_exit(ahc_linux_exit);