drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132 #include <linux/slab.h>
 133
 134
 135 /*
 136  * Set this to the delay in seconds after SCSI bus reset.
 137  * Note, we honor this only for the initial bus reset.
 138  * The scsi error recovery code performs its own bus settle
 139  * delay handling for error recovery actions.
 140  */
 141 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 143 #else
 144 #define AIC7XXX_RESET_DELAY 5000
 145 #endif
 146
 147 /*
 148  * To change the default number of tagged transactions allowed per-device,
 149  * add a line to the lilo.conf file like:
 150  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 151  * which will result in the first four devices on the first two
 152  * controllers being set to a tagged queue depth of 32.
 153  *
 154  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 155  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 156  * for channel 1.
 157  */
 158 typedef struct {
 159         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 160 } adapter_tag_info_t;
 161
 162 /*
 163  * Modify this as you see fit for your system.
 164  *
 165  * 0                    tagged queuing disabled
 166  * 1 <= n <= 253        n == max tags ever dispatched.
 167  *
 168  * The driver will throttle the number of commands dispatched to a
 169  * device if it returns queue full.  For devices with a fixed maximum
 170  * queue depth, the driver will eventually determine this depth and
 171  * lock it in (a console message is printed to indicate that a lock
 172  * has occurred).  On some devices, queue full is returned for a temporary
 173  * resource shortage.  These devices will return queue full at varying
 174  * depths.  The driver will throttle back when the queue fulls occur and
 175  * attempt to slowly increase the depth over time as the device recovers
 176  * from the resource shortage.
 177  *
 178  * In this example, the first line will disable tagged queueing for all
 179  * the devices on the first probed aic7xxx adapter.
 180  *
 181  * The second line enables tagged queueing with 4 commands/LUN for IDs
 182  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 183  * driver to attempt to use up to 64 tags for ID 1.
 184  *
 185  * The third line is the same as the first line.
 186  *
 187  * The fourth line disables tagged queueing for devices 0 and 3.  It
 188  * enables tagged queueing for the other IDs, with 16 commands/LUN
 189  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 190  * IDs 2, 5-7, and 9-15.
 191  */
 192
 193 /*
 194  * NOTE: The below structure is for reference only, the actual structure
 195  *       to modify in order to change things is just below this comment block.
 196 adapter_tag_info_t aic7xxx_tag_info[] =
 197 {
 198         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 199         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 200         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 201         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 202 };
 203 */
 204
 205 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 206 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 207 #else
 208 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 209 #endif
 210
 211 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 212         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 213         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 214         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 215         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 216         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 217         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 218         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 219         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 220 }
 221
 222 /*
 223  * By default, use the number of commands specified by
 224  * the users kernel configuration.
 225  */
 226 static adapter_tag_info_t aic7xxx_tag_info[] =
 227 {
 228         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 229         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 230         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 231         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 232         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 233         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 234         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 235         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 236         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 244 };
 245
 246 /*
 247  * There should be a specific return value for this in scsi.h, but
 248  * it seems that most drivers ignore it.
 249  */
 250 #define DID_UNDERFLOW   DID_ERROR
 251
 252 void
 253 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 254 {
 255         printk("(scsi%d:%c:%d:%d): ",
 256                ahc->platform_data->host->host_no,
 257                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 258                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 259                scb != NULL ? SCB_GET_LUN(scb) : -1);
 260 }
 261
 262 /*
 263  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 264  *       cards in the system.  This should be fixed.  Exceptions to this
 265  *       rule are noted in the comments.
 266  */
 267
 268 /*
 269  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 270  * has no effect on any later resets that might occur due to things like
 271  * SCSI bus timeouts.
 272  */
 273 static uint32_t aic7xxx_no_reset;
 274
 275 /*
 276  * Should we force EXTENDED translation on a controller.
 277  *     0 == Use whatever is in the SEEPROM or default to off
 278  *     1 == Use whatever is in the SEEPROM or default to on
 279  */
 280 static uint32_t aic7xxx_extended;
 281
 282 /*
 283  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 284  * dubious at best.  To my knowledge, this option has never actually
 285  * solved a PCI parity problem, but on certain machines with broken PCI
 286  * chipset configurations where stray PCI transactions with bad parity are
 287  * the norm rather than the exception, the error messages can be overwhelming.
 288  * It's included in the driver for completeness.
 289  *   0     = Shut off PCI parity check
 290  *   non-0 = reverse polarity pci parity checking
 291  */
 292 static uint32_t aic7xxx_pci_parity = ~0;
 293
 294 /*
 295  * There are lots of broken chipsets in the world.  Some of them will
 296  * violate the PCI spec when we issue byte sized memory writes to our
 297  * controller.  I/O mapped register access, if allowed by the given
 298  * platform, will work in almost all cases.
 299  */
 300 uint32_t aic7xxx_allow_memio = ~0;
 301
 302 /*
 303  * So that we can set how long each device is given as a selection timeout.
 304  * The table of values goes like this:
 305  *   0 - 256ms
 306  *   1 - 128ms
 307  *   2 - 64ms
 308  *   3 - 32ms
 309  * We default to 256ms because some older devices need a longer time
 310  * to respond to initial selection.
 311  */
 312 static uint32_t aic7xxx_seltime;
 313
 314 /*
 315  * Certain devices do not perform any aging on commands.  Should the
 316  * device be saturated by commands in one portion of the disk, it is
 317  * possible for transactions on far away sectors to never be serviced.
 318  * To handle these devices, we can periodically send an ordered tag to
 319  * force all outstanding transactions to be serviced prior to a new
 320  * transaction.
 321  */
 322 static uint32_t aic7xxx_periodic_otag;
 323
 324 /*
 325  * Module information and settable options.
 326  */
 327 static char *aic7xxx = NULL;
 328
 329 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 330 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
 331 MODULE_LICENSE("Dual BSD/GPL");
 332 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 333 module_param(aic7xxx, charp, 0444);
 334 MODULE_PARM_DESC(aic7xxx,
 335 "period-delimited options string:\n"
 336 "       verbose                 Enable verbose/diagnostic logging\n"
 337 "       allow_memio             Allow device registers to be memory mapped\n"
 338 "       debug                   Bitmask of debug values to enable\n"
 339 "       no_probe                Toggle EISA/VLB controller probing\n"
 340 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 341 "       no_reset                Suppress initial bus resets\n"
 342 "       extended                Enable extended geometry on all controllers\n"
 343 "       periodic_otag           Send an ordered tagged transaction\n"
 344 "                               periodically to prevent tag starvation.\n"
 345 "                               This may be required by some older disk\n"
 346 "                               drives or RAID arrays.\n"
 347 "       tag_info:<tag_str>      Set per-target tag depth\n"
 348 "       global_tag_depth:<int>  Global tag depth for every target\n"
 349 "                               on every bus\n"
 350 "       seltime:<int>           Selection Timeout\n"
 351 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 352 "\n"
 353 "       Sample modprobe configuration file:\n"
 354 "       #       Toggle EISA/VLB probing\n"
 355 "       #       Set tag depth on Controller 1/Target 1 to 10 tags\n"
 356 "       #       Shorten the selection timeout to 128ms\n"
 357 "\n"
 358 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 359 );
 360
 361 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 362                                          struct scsi_device *,
 363                                          struct scb *);
 364 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 365                                          struct scsi_cmnd *cmd);
 366 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 367 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 368 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 369 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 370 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 371                                      struct ahc_devinfo *devinfo);
 372 static void ahc_linux_device_queue_depth(struct scsi_device *);
 373 static int ahc_linux_run_command(struct ahc_softc*,
 374                                  struct ahc_linux_device *,
 375                                  struct scsi_cmnd *);
 376 static void ahc_linux_setup_tag_info_global(char *p);
 377 static int  aic7xxx_setup(char *s);
 378
 379 static int ahc_linux_unit;
 380
 381
 382 /************************** OS Utility Wrappers *******************************/
 383 void
 384 ahc_delay(long usec)
 385 {
 386         /*
 387          * udelay on Linux can have problems for
 388          * multi-millisecond waits.  Wait at most
 389          * 1024us per call.
 390          */
 391         while (usec > 0) {
 392                 udelay(usec % 1024);
 393                 usec -= 1024;
 394         }
 395 }
 396
 397 /***************************** Low Level I/O **********************************/
 398 uint8_t
 399 ahc_inb(struct ahc_softc * ahc, long port)
 400 {
 401         uint8_t x;
 402
 403         if (ahc->tag == BUS_SPACE_MEMIO) {
 404                 x = readb(ahc->bsh.maddr + port);
 405         } else {
 406                 x = inb(ahc->bsh.ioport + port);
 407         }
 408         mb();
 409         return (x);
 410 }
 411
 412 void
 413 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
 414 {
 415         if (ahc->tag == BUS_SPACE_MEMIO) {
 416                 writeb(val, ahc->bsh.maddr + port);
 417         } else {
 418                 outb(val, ahc->bsh.ioport + port);
 419         }
 420         mb();
 421 }
 422
 423 void
 424 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 425 {
 426         int i;
 427
 428         /*
 429          * There is probably a more efficient way to do this on Linux
 430          * but we don't use this for anything speed critical and this
 431          * should work.
 432          */
 433         for (i = 0; i < count; i++)
 434                 ahc_outb(ahc, port, *array++);
 435 }
 436
 437 void
 438 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 439 {
 440         int i;
 441
 442         /*
 443          * There is probably a more efficient way to do this on Linux
 444          * but we don't use this for anything speed critical and this
 445          * should work.
 446          */
 447         for (i = 0; i < count; i++)
 448                 *array++ = ahc_inb(ahc, port);
 449 }
 450
 451 /********************************* Inlines ************************************/
 452 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 453
 454 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 455                                       struct ahc_dma_seg *sg,
 456                                       dma_addr_t addr, bus_size_t len);
 457
 458 static void
 459 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 460 {
 461         struct scsi_cmnd *cmd;
 462
 463         cmd = scb->io_ctx;
 464         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 465
 466         scsi_dma_unmap(cmd);
 467 }
 468
 469 static int
 470 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 471                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 472 {
 473         int      consumed;
 474
 475         if ((scb->sg_count + 1) > AHC_NSEG)
 476                 panic("Too few segs for dma mapping.  "
 477                       "Increase AHC_NSEG\n");
 478
 479         consumed = 1;
 480         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 481         scb->platform_data->xfer_len += len;
 482
 483         if (sizeof(dma_addr_t) > 4
 484          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 485                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 486
 487         sg->len = ahc_htole32(len);
 488         return (consumed);
 489 }
 490
 491 /*
 492  * Return a string describing the driver.
 493  */
 494 static const char *
 495 ahc_linux_info(struct Scsi_Host *host)
 496 {
 497         static char buffer[512];
 498         char    ahc_info[256];
 499         char   *bp;
 500         struct ahc_softc *ahc;
 501
 502         bp = &buffer[0];
 503         ahc = *(struct ahc_softc **)host->hostdata;
 504         memset(bp, 0, sizeof(buffer));
 505         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
 506                         "        <");
 507         strcat(bp, ahc->description);
 508         strcat(bp, ">\n"
 509                         "        ");
 510         ahc_controller_info(ahc, ahc_info);
 511         strcat(bp, ahc_info);
 512         strcat(bp, "\n");
 513
 514         return (bp);
 515 }
 516
 517 /*
 518  * Queue an SCB to the controller.
 519  */
 520 static int
 521 ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 522 {
 523         struct   ahc_softc *ahc;
 524         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 525         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 526         unsigned long flags;
 527
 528         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 529
 530         ahc_lock(ahc, &flags);
 531         if (ahc->platform_data->qfrozen == 0) {
 532                 cmd->scsi_done = scsi_done;
 533                 cmd->result = CAM_REQ_INPROG << 16;
 534                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 535         }
 536         ahc_unlock(ahc, &flags);
 537
 538         return rtn;
 539 }
 540
 541 static DEF_SCSI_QCMD(ahc_linux_queue)
 542
 543 static inline struct scsi_target **
 544 ahc_linux_target_in_softc(struct scsi_target *starget)
 545 {
 546         struct  ahc_softc *ahc =
 547                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 548         unsigned int target_offset;
 549
 550         target_offset = starget->id;
 551         if (starget->channel != 0)
 552                 target_offset += 8;
 553
 554         return &ahc->platform_data->starget[target_offset];
 555 }
 556
 557 static int
 558 ahc_linux_target_alloc(struct scsi_target *starget)
 559 {
 560         struct  ahc_softc *ahc =
 561                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 562         struct seeprom_config *sc = ahc->seep_config;
 563         unsigned long flags;
 564         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 565         unsigned short scsirate;
 566         struct ahc_devinfo devinfo;
 567         struct ahc_initiator_tinfo *tinfo;
 568         struct ahc_tmode_tstate *tstate;
 569         char channel = starget->channel + 'A';
 570         unsigned int our_id = ahc->our_id;
 571         unsigned int target_offset;
 572
 573         target_offset = starget->id;
 574         if (starget->channel != 0)
 575                 target_offset += 8;
 576
 577         if (starget->channel)
 578                 our_id = ahc->our_id_b;
 579
 580         ahc_lock(ahc, &flags);
 581
 582         BUG_ON(*ahc_targp != NULL);
 583
 584         *ahc_targp = starget;
 585
 586         if (sc) {
 587                 int maxsync = AHC_SYNCRATE_DT;
 588                 int ultra = 0;
 589                 int flags = sc->device_flags[target_offset];
 590
 591                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 592                     if (flags & CFSYNCHISULTRA)
 593                         ultra = 1;
 594                 } else if (flags & CFULTRAEN)
 595                         ultra = 1;
 596                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 597                  * change it to ultra=0, CFXFER = 0 */
 598                 if(ultra && (flags & CFXFER) == 0x04) {
 599                         ultra = 0;
 600                         flags &= ~CFXFER;
 601                 }
 602
 603                 if ((ahc->features & AHC_ULTRA2) != 0) {
 604                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 605                 } else {
 606                         scsirate = (flags & CFXFER) << 4;
 607                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 608                                 AHC_SYNCRATE_FAST;
 609                 }
 610                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 611                 if (!(flags & CFSYNCH))
 612                         spi_max_offset(starget) = 0;
 613                 spi_min_period(starget) =
 614                         ahc_find_period(ahc, scsirate, maxsync);
 615
 616                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 617                                             starget->id, &tstate);
 618         }
 619         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 620                             CAM_LUN_WILDCARD, channel,
 621                             ROLE_INITIATOR);
 622         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 623                          AHC_TRANS_GOAL, /*paused*/FALSE);
 624         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 625                       AHC_TRANS_GOAL, /*paused*/FALSE);
 626         ahc_unlock(ahc, &flags);
 627
 628         return 0;
 629 }
 630
 631 static void
 632 ahc_linux_target_destroy(struct scsi_target *starget)
 633 {
 634         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 635
 636         *ahc_targp = NULL;
 637 }
 638
 639 static int
 640 ahc_linux_slave_alloc(struct scsi_device *sdev)
 641 {
 642         struct  ahc_softc *ahc =
 643                 *((struct ahc_softc **)sdev->host->hostdata);
 644         struct scsi_target *starget = sdev->sdev_target;
 645         struct ahc_linux_device *dev;
 646
 647         if (bootverbose)
 648                 printk("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 649
 650         dev = scsi_transport_device_data(sdev);
 651         memset(dev, 0, sizeof(*dev));
 652
 653         /*
 654          * We start out life using untagged
 655          * transactions of which we allow one.
 656          */
 657         dev->openings = 1;
 658
 659         /*
 660          * Set maxtags to 0.  This will be changed if we
 661          * later determine that we are dealing with
 662          * a tagged queuing capable device.
 663          */
 664         dev->maxtags = 0;
 665
 666         spi_period(starget) = 0;
 667
 668         return 0;
 669 }
 670
 671 static int
 672 ahc_linux_slave_configure(struct scsi_device *sdev)
 673 {
 674         struct  ahc_softc *ahc;
 675
 676         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 677
 678         if (bootverbose)
 679                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 680
 681         ahc_linux_device_queue_depth(sdev);
 682
 683         /* Initial Domain Validation */
 684         if (!spi_initial_dv(sdev->sdev_target))
 685                 spi_dv_device(sdev);
 686
 687         return 0;
 688 }
 689
 690 #if defined(__i386__)
 691 /*
 692  * Return the disk geometry for the given SCSI device.
 693  */
 694 static int
 695 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 696                     sector_t capacity, int geom[])
 697 {
 698         uint8_t *bh;
 699         int      heads;
 700         int      sectors;
 701         int      cylinders;
 702         int      ret;
 703         int      extended;
 704         struct   ahc_softc *ahc;
 705         u_int    channel;
 706
 707         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 708         channel = sdev_channel(sdev);
 709
 710         bh = scsi_bios_ptable(bdev);
 711         if (bh) {
 712                 ret = scsi_partsize(bh, capacity,
 713                                     &geom[2], &geom[0], &geom[1]);
 714                 kfree(bh);
 715                 if (ret != -1)
 716                         return (ret);
 717         }
 718         heads = 64;
 719         sectors = 32;
 720         cylinders = aic_sector_div(capacity, heads, sectors);
 721
 722         if (aic7xxx_extended != 0)
 723                 extended = 1;
 724         else if (channel == 0)
 725                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 726         else
 727                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 728         if (extended && cylinders >= 1024) {
 729                 heads = 255;
 730                 sectors = 63;
 731                 cylinders = aic_sector_div(capacity, heads, sectors);
 732         }
 733         geom[0] = heads;
 734         geom[1] = sectors;
 735         geom[2] = cylinders;
 736         return (0);
 737 }
 738 #endif
 739
 740 /*
 741  * Abort the current SCSI command(s).
 742  */
 743 static int
 744 ahc_linux_abort(struct scsi_cmnd *cmd)
 745 {
 746         int error;
 747
 748         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 749         if (error != 0)
 750                 printk("aic7xxx_abort returns 0x%x\n", error);
 751         return (error);
 752 }
 753
 754 /*
 755  * Attempt to send a target reset message to the device that timed out.
 756  */
 757 static int
 758 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 759 {
 760         int error;
 761
 762         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 763         if (error != 0)
 764                 printk("aic7xxx_dev_reset returns 0x%x\n", error);
 765         return (error);
 766 }
 767
 768 /*
 769  * Reset the SCSI bus.
 770  */
 771 static int
 772 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 773 {
 774         struct ahc_softc *ahc;
 775         int    found;
 776         unsigned long flags;
 777
 778         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 779
 780         ahc_lock(ahc, &flags);
 781         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 782                                   /*initiate reset*/TRUE);
 783         ahc_unlock(ahc, &flags);
 784
 785         if (bootverbose)
 786                 printk("%s: SCSI bus reset delivered. "
 787                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 788
 789         return SUCCESS;
 790 }
 791
 792 struct scsi_host_template aic7xxx_driver_template = {
 793         .module                 = THIS_MODULE,
 794         .name                   = "aic7xxx",
 795         .proc_name              = "aic7xxx",
 796         .show_info              = ahc_linux_show_info,
 797         .write_info             = ahc_proc_write_seeprom,
 798         .info                   = ahc_linux_info,
 799         .queuecommand           = ahc_linux_queue,
 800         .eh_abort_handler       = ahc_linux_abort,
 801         .eh_device_reset_handler = ahc_linux_dev_reset,
 802         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 803 #if defined(__i386__)
 804         .bios_param             = ahc_linux_biosparam,
 805 #endif
 806         .can_queue              = AHC_MAX_QUEUE,
 807         .this_id                = -1,
 808         .max_sectors            = 8192,
 809         .cmd_per_lun            = 2,
 810         .slave_alloc            = ahc_linux_slave_alloc,
 811         .slave_configure        = ahc_linux_slave_configure,
 812         .target_alloc           = ahc_linux_target_alloc,
 813         .target_destroy         = ahc_linux_target_destroy,
 814 };
 815
 816 /**************************** Tasklet Handler *********************************/
 817
 818 /******************************** Macros **************************************/
 819 #define BUILD_SCSIID(ahc, cmd)                                              \
 820         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 821         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 822         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 823
 824 /******************************** Bus DMA *************************************/
 825 int
 826 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 827                    bus_size_t alignment, bus_size_t boundary,
 828                    dma_addr_t lowaddr, dma_addr_t highaddr,
 829                    bus_dma_filter_t *filter, void *filterarg,
 830                    bus_size_t maxsize, int nsegments,
 831                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 832 {
 833         bus_dma_tag_t dmat;
 834
 835         dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
 836         if (dmat == NULL)
 837                 return (ENOMEM);
 838
 839         /*
 840          * Linux is very simplistic about DMA memory.  For now don't
 841          * maintain all specification information.  Once Linux supplies
 842          * better facilities for doing these operations, or the
 843          * needs of this particular driver change, we might need to do
 844          * more here.
 845          */
 846         dmat->alignment = alignment;
 847         dmat->boundary = boundary;
 848         dmat->maxsize = maxsize;
 849         *ret_tag = dmat;
 850         return (0);
 851 }
 852
 853 void
 854 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 855 {
 856         kfree(dmat);
 857 }
 858
 859 int
 860 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 861                  int flags, bus_dmamap_t *mapp)
 862 {
 863         /* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
 864         *vaddr = dma_alloc_coherent(ahc->dev, dmat->maxsize, mapp, GFP_ATOMIC);
 865         if (*vaddr == NULL)
 866                 return ENOMEM;
 867         return 0;
 868 }
 869
 870 void
 871 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 872                 void* vaddr, bus_dmamap_t map)
 873 {
 874         dma_free_coherent(ahc->dev, dmat->maxsize, vaddr, map);
 875 }
 876
 877 int
 878 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 879                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 880                 void *cb_arg, int flags)
 881 {
 882         /*
 883          * Assume for now that this will only be used during
 884          * initialization and not for per-transaction buffer mapping.
 885          */
 886         bus_dma_segment_t stack_sg;
 887
 888         stack_sg.ds_addr = map;
 889         stack_sg.ds_len = dmat->maxsize;
 890         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 891         return (0);
 892 }
 893
 894 void
 895 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 896 {
 897 }
 898
 899 int
 900 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 901 {
 902         /* Nothing to do */
 903         return (0);
 904 }
 905
 906 static void
 907 ahc_linux_setup_tag_info_global(char *p)
 908 {
 909         int tags, i, j;
 910
 911         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 912         printk("Setting Global Tags= %d\n", tags);
 913
 914         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 915                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 916                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 917                 }
 918         }
 919 }
 920
 921 static void
 922 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 923 {
 924
 925         if ((instance >= 0) && (targ >= 0)
 926          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 927          && (targ < AHC_NUM_TARGETS)) {
 928                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 929                 if (bootverbose)
 930                         printk("tag_info[%d:%d] = %d\n", instance, targ, value);
 931         }
 932 }
 933
 934 static char *
 935 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 936                        void (*callback)(u_long, int, int, int32_t),
 937                        u_long callback_arg)
 938 {
 939         char    *tok_end;
 940         char    *tok_end2;
 941         int      i;
 942         int      instance;
 943         int      targ;
 944         int      done;
 945         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 946
 947         /* All options use a ':' name/arg separator */
 948         if (*opt_arg != ':')
 949                 return (opt_arg);
 950         opt_arg++;
 951         instance = -1;
 952         targ = -1;
 953         done = FALSE;
 954         /*
 955          * Restore separator that may be in
 956          * the middle of our option argument.
 957          */
 958         tok_end = strchr(opt_arg, '\0');
 959         if (tok_end < end)
 960                 *tok_end = ',';
 961         while (!done) {
 962                 switch (*opt_arg) {
 963                 case '{':
 964                         if (instance == -1) {
 965                                 instance = 0;
 966                         } else {
 967                                 if (depth > 1) {
 968                                         if (targ == -1)
 969                                                 targ = 0;
 970                                 } else {
 971                                         printk("Malformed Option %s\n",
 972                                                opt_name);
 973                                         done = TRUE;
 974                                 }
 975                         }
 976                         opt_arg++;
 977                         break;
 978                 case '}':
 979                         if (targ != -1)
 980                                 targ = -1;
 981                         else if (instance != -1)
 982                                 instance = -1;
 983                         opt_arg++;
 984                         break;
 985                 case ',':
 986                 case '.':
 987                         if (instance == -1)
 988                                 done = TRUE;
 989                         else if (targ >= 0)
 990                                 targ++;
 991                         else if (instance >= 0)
 992                                 instance++;
 993                         opt_arg++;
 994                         break;
 995                 case '\0':
 996                         done = TRUE;
 997                         break;
 998                 default:
 999                         tok_end = end;
1000                         for (i = 0; tok_list[i]; i++) {
1001                                 tok_end2 = strchr(opt_arg, tok_list[i]);
1002                                 if ((tok_end2) && (tok_end2 < tok_end))
1003                                         tok_end = tok_end2;
1004                         }
1005                         callback(callback_arg, instance, targ,
1006                                  simple_strtol(opt_arg, NULL, 0));
1007                         opt_arg = tok_end;
1008                         break;
1009                 }
1010         }
1011         return (opt_arg);
1012 }
1013
1014 /*
1015  * Handle Linux boot parameters. This routine allows for assigning a value
1016  * to a parameter with a ':' between the parameter and the value.
1017  * ie. aic7xxx=stpwlev:1,extended
1018  */
1019 static int
1020 aic7xxx_setup(char *s)
1021 {
1022         int     i, n;
1023         char   *p;
1024         char   *end;
1025
1026         static const struct {
1027                 const char *name;
1028                 uint32_t *flag;
1029         } options[] = {
1030                 { "extended", &aic7xxx_extended },
1031                 { "no_reset", &aic7xxx_no_reset },
1032                 { "verbose", &aic7xxx_verbose },
1033                 { "allow_memio", &aic7xxx_allow_memio},
1034 #ifdef AHC_DEBUG
1035                 { "debug", &ahc_debug },
1036 #endif
1037                 { "periodic_otag", &aic7xxx_periodic_otag },
1038                 { "pci_parity", &aic7xxx_pci_parity },
1039                 { "seltime", &aic7xxx_seltime },
1040                 { "tag_info", NULL },
1041                 { "global_tag_depth", NULL },
1042                 { "dv", NULL }
1043         };
1044
1045         end = strchr(s, '\0');
1046
1047         /*
1048          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1049          * will never be 0 in this case.
1050          */
1051         n = 0;
1052
1053         while ((p = strsep(&s, ",.")) != NULL) {
1054                 if (*p == '\0')
1055                         continue;
1056                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1057
1058                         n = strlen(options[i].name);
1059                         if (strncmp(options[i].name, p, n) == 0)
1060                                 break;
1061                 }
1062                 if (i == ARRAY_SIZE(options))
1063                         continue;
1064
1065                 if (strncmp(p, "global_tag_depth", n) == 0) {
1066                         ahc_linux_setup_tag_info_global(p + n);
1067                 } else if (strncmp(p, "tag_info", n) == 0) {
1068                         s = ahc_parse_brace_option("tag_info", p + n, end,
1069                             2, ahc_linux_setup_tag_info, 0);
1070                 } else if (p[n] == ':') {
1071                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1072                 } else if (strncmp(p, "verbose", n) == 0) {
1073                         *(options[i].flag) = 1;
1074                 } else {
1075                         *(options[i].flag) ^= 0xFFFFFFFF;
1076                 }
1077         }
1078         return 1;
1079 }
1080
1081 __setup("aic7xxx=", aic7xxx_setup);
1082
1083 uint32_t aic7xxx_verbose;
1084
1085 int
1086 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1087 {
1088         char    buf[80];
1089         struct  Scsi_Host *host;
1090         char    *new_name;
1091         u_long  s;
1092         int     retval;
1093
1094         template->name = ahc->description;
1095         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1096         if (host == NULL)
1097                 return (ENOMEM);
1098
1099         *((struct ahc_softc **)host->hostdata) = ahc;
1100         ahc->platform_data->host = host;
1101         host->can_queue = AHC_MAX_QUEUE;
1102         host->cmd_per_lun = 2;
1103         /* XXX No way to communicate the ID for multiple channels */
1104         host->this_id = ahc->our_id;
1105         host->irq = ahc->platform_data->irq;
1106         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1107         host->max_lun = AHC_NUM_LUNS;
1108         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1109         host->sg_tablesize = AHC_NSEG;
1110         ahc_lock(ahc, &s);
1111         ahc_set_unit(ahc, ahc_linux_unit++);
1112         ahc_unlock(ahc, &s);
1113         sprintf(buf, "scsi%d", host->host_no);
1114         new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1115         if (new_name != NULL) {
1116                 strcpy(new_name, buf);
1117                 ahc_set_name(ahc, new_name);
1118         }
1119         host->unique_id = ahc->unit;
1120         ahc_linux_initialize_scsi_bus(ahc);
1121         ahc_intr_enable(ahc, TRUE);
1122
1123         host->transportt = ahc_linux_transport_template;
1124
1125         retval = scsi_add_host(host, ahc->dev);
1126         if (retval) {
1127                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1128                 scsi_host_put(host);
1129                 return retval;
1130         }
1131
1132         scsi_scan_host(host);
1133         return 0;
1134 }
1135
1136 /*
1137  * Place the SCSI bus into a known state by either resetting it,
1138  * or forcing transfer negotiations on the next command to any
1139  * target.
1140  */
1141 static void
1142 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1143 {
1144         int i;
1145         int numtarg;
1146         unsigned long s;
1147
1148         i = 0;
1149         numtarg = 0;
1150
1151         ahc_lock(ahc, &s);
1152
1153         if (aic7xxx_no_reset != 0)
1154                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1155
1156         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1157                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1158         else
1159                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1160
1161         if ((ahc->features & AHC_TWIN) != 0) {
1162
1163                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1164                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1165                 } else {
1166                         if (numtarg == 0)
1167                                 i = 8;
1168                         numtarg += 8;
1169                 }
1170         }
1171
1172         /*
1173          * Force negotiation to async for all targets that
1174          * will not see an initial bus reset.
1175          */
1176         for (; i < numtarg; i++) {
1177                 struct ahc_devinfo devinfo;
1178                 struct ahc_initiator_tinfo *tinfo;
1179                 struct ahc_tmode_tstate *tstate;
1180                 u_int our_id;
1181                 u_int target_id;
1182                 char channel;
1183
1184                 channel = 'A';
1185                 our_id = ahc->our_id;
1186                 target_id = i;
1187                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1188                         channel = 'B';
1189                         our_id = ahc->our_id_b;
1190                         target_id = i % 8;
1191                 }
1192                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1193                                             target_id, &tstate);
1194                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1195                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1196                 ahc_update_neg_request(ahc, &devinfo, tstate,
1197                                        tinfo, AHC_NEG_ALWAYS);
1198         }
1199         ahc_unlock(ahc, &s);
1200         /* Give the bus some time to recover */
1201         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1202                 ahc_linux_freeze_simq(ahc);
1203                 msleep(AIC7XXX_RESET_DELAY);
1204                 ahc_linux_release_simq(ahc);
1205         }
1206 }
1207
1208 int
1209 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1210 {
1211
1212         ahc->platform_data =
1213             kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
1214         if (ahc->platform_data == NULL)
1215                 return (ENOMEM);
1216         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1217         ahc_lockinit(ahc);
1218         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1219         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1220         if (aic7xxx_pci_parity == 0)
1221                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1222
1223         return (0);
1224 }
1225
1226 void
1227 ahc_platform_free(struct ahc_softc *ahc)
1228 {
1229         struct scsi_target *starget;
1230         int i;
1231
1232         if (ahc->platform_data != NULL) {
1233                 /* destroy all of the device and target objects */
1234                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1235                         starget = ahc->platform_data->starget[i];
1236                         if (starget != NULL) {
1237                                 ahc->platform_data->starget[i] = NULL;
1238                         }
1239                 }
1240
1241                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1242                         free_irq(ahc->platform_data->irq, ahc);
1243                 if (ahc->tag == BUS_SPACE_PIO
1244                  && ahc->bsh.ioport != 0)
1245                         release_region(ahc->bsh.ioport, 256);
1246                 if (ahc->tag == BUS_SPACE_MEMIO
1247                  && ahc->bsh.maddr != NULL) {
1248                         iounmap(ahc->bsh.maddr);
1249                         release_mem_region(ahc->platform_data->mem_busaddr,
1250                                            0x1000);
1251                 }
1252
1253                 if (ahc->platform_data->host)
1254                         scsi_host_put(ahc->platform_data->host);
1255
1256                 kfree(ahc->platform_data);
1257         }
1258 }
1259
1260 void
1261 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1262 {
1263         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1264                                 SCB_GET_CHANNEL(ahc, scb),
1265                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1266                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1267 }
1268
1269 void
1270 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1271                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1272 {
1273         struct ahc_linux_device *dev;
1274         int was_queuing;
1275         int now_queuing;
1276
1277         if (sdev == NULL)
1278                 return;
1279         dev = scsi_transport_device_data(sdev);
1280
1281         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1282         switch (alg) {
1283         default:
1284         case AHC_QUEUE_NONE:
1285                 now_queuing = 0;
1286                 break;
1287         case AHC_QUEUE_BASIC:
1288                 now_queuing = AHC_DEV_Q_BASIC;
1289                 break;
1290         case AHC_QUEUE_TAGGED:
1291                 now_queuing = AHC_DEV_Q_TAGGED;
1292                 break;
1293         }
1294         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1295          && (was_queuing != now_queuing)
1296          && (dev->active != 0)) {
1297                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1298                 dev->qfrozen++;
1299         }
1300
1301         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1302         if (now_queuing) {
1303                 u_int usertags;
1304
1305                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1306                 if (!was_queuing) {
1307                         /*
1308                          * Start out aggressively and allow our
1309                          * dynamic queue depth algorithm to take
1310                          * care of the rest.
1311                          */
1312                         dev->maxtags = usertags;
1313                         dev->openings = dev->maxtags - dev->active;
1314                 }
1315                 if (dev->maxtags == 0) {
1316                         /*
1317                          * Queueing is disabled by the user.
1318                          */
1319                         dev->openings = 1;
1320                 } else if (alg == AHC_QUEUE_TAGGED) {
1321                         dev->flags |= AHC_DEV_Q_TAGGED;
1322                         if (aic7xxx_periodic_otag != 0)
1323                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1324                 } else
1325                         dev->flags |= AHC_DEV_Q_BASIC;
1326         } else {
1327                 /* We can only have one opening. */
1328                 dev->maxtags = 0;
1329                 dev->openings =  1 - dev->active;
1330         }
1331         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1332         case AHC_DEV_Q_BASIC:
1333         case AHC_DEV_Q_TAGGED:
1334                 scsi_change_queue_depth(sdev,
1335                                 dev->openings + dev->active);
1336                 break;
1337         default:
1338                 /*
1339                  * We allow the OS to queue 2 untagged transactions to
1340                  * us at any time even though we can only execute them
1341                  * serially on the controller/device.  This should
1342                  * remove some latency.
1343                  */
1344                 scsi_change_queue_depth(sdev, 2);
1345                 break;
1346         }
1347 }
1348
1349 int
1350 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1351                         int lun, u_int tag, role_t role, uint32_t status)
1352 {
1353         return 0;
1354 }
1355
1356 static u_int
1357 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1358 {
1359         static int warned_user;
1360         u_int tags;
1361
1362         tags = 0;
1363         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1364                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1365                         if (warned_user == 0) {
1366
1367                                 printk(KERN_WARNING
1368 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1369 "aic7xxx: for installed controllers. Using defaults\n"
1370 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1371 "aic7xxx: the aic7xxx_osm..c source file.\n");
1372                                 warned_user++;
1373                         }
1374                         tags = AHC_MAX_QUEUE;
1375                 } else {
1376                         adapter_tag_info_t *tag_info;
1377
1378                         tag_info = &aic7xxx_tag_info[ahc->unit];
1379                         tags = tag_info->tag_commands[devinfo->target_offset];
1380                         if (tags > AHC_MAX_QUEUE)
1381                                 tags = AHC_MAX_QUEUE;
1382                 }
1383         }
1384         return (tags);
1385 }
1386
1387 /*
1388  * Determines the queue depth for a given device.
1389  */
1390 static void
1391 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1392 {
1393         struct  ahc_devinfo devinfo;
1394         u_int   tags;
1395         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1396
1397         ahc_compile_devinfo(&devinfo,
1398                             sdev->sdev_target->channel == 0
1399                           ? ahc->our_id : ahc->our_id_b,
1400                             sdev->sdev_target->id, sdev->lun,
1401                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1402                             ROLE_INITIATOR);
1403         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1404         if (tags != 0 && sdev->tagged_supported != 0) {
1405
1406                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1407                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1408                                devinfo.lun, AC_TRANSFER_NEG);
1409                 ahc_print_devinfo(ahc, &devinfo);
1410                 printk("Tagged Queuing enabled.  Depth %d\n", tags);
1411         } else {
1412                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1413                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1414                                devinfo.lun, AC_TRANSFER_NEG);
1415         }
1416 }
1417
1418 static int
1419 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1420                       struct scsi_cmnd *cmd)
1421 {
1422         struct   scb *scb;
1423         struct   hardware_scb *hscb;
1424         struct   ahc_initiator_tinfo *tinfo;
1425         struct   ahc_tmode_tstate *tstate;
1426         uint16_t mask;
1427         struct scb_tailq *untagged_q = NULL;
1428         int nseg;
1429
1430         /*
1431          * Schedule us to run later.  The only reason we are not
1432          * running is because the whole controller Q is frozen.
1433          */
1434         if (ahc->platform_data->qfrozen != 0)
1435                 return SCSI_MLQUEUE_HOST_BUSY;
1436
1437         /*
1438          * We only allow one untagged transaction
1439          * per target in the initiator role unless
1440          * we are storing a full busy target *lun*
1441          * table in SCB space.
1442          */
1443         if (!(cmd->flags & SCMD_TAGGED)
1444             && (ahc->features & AHC_SCB_BTT) == 0) {
1445                 int target_offset;
1446
1447                 target_offset = cmd->device->id + cmd->device->channel * 8;
1448                 untagged_q = &(ahc->untagged_queues[target_offset]);
1449                 if (!TAILQ_EMPTY(untagged_q))
1450                         /* if we're already executing an untagged command
1451                          * we're busy to another */
1452                         return SCSI_MLQUEUE_DEVICE_BUSY;
1453         }
1454
1455         nseg = scsi_dma_map(cmd);
1456         if (nseg < 0)
1457                 return SCSI_MLQUEUE_HOST_BUSY;
1458
1459         /*
1460          * Get an scb to use.
1461          */
1462         scb = ahc_get_scb(ahc);
1463         if (!scb) {
1464                 scsi_dma_unmap(cmd);
1465                 return SCSI_MLQUEUE_HOST_BUSY;
1466         }
1467
1468         scb->io_ctx = cmd;
1469         scb->platform_data->dev = dev;
1470         hscb = scb->hscb;
1471         cmd->host_scribble = (char *)scb;
1472
1473         /*
1474          * Fill out basics of the HSCB.
1475          */
1476         hscb->control = 0;
1477         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1478         hscb->lun = cmd->device->lun;
1479         mask = SCB_GET_TARGET_MASK(ahc, scb);
1480         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1481                                     SCB_GET_OUR_ID(scb),
1482                                     SCB_GET_TARGET(ahc, scb), &tstate);
1483         hscb->scsirate = tinfo->scsirate;
1484         hscb->scsioffset = tinfo->curr.offset;
1485         if ((tstate->ultraenb & mask) != 0)
1486                 hscb->control |= ULTRAENB;
1487
1488         if ((ahc->user_discenable & mask) != 0)
1489                 hscb->control |= DISCENB;
1490
1491         if ((tstate->auto_negotiate & mask) != 0) {
1492                 scb->flags |= SCB_AUTO_NEGOTIATE;
1493                 scb->hscb->control |= MK_MESSAGE;
1494         }
1495
1496         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1497                 if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1498                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1499                         hscb->control |= MSG_ORDERED_TASK;
1500                         dev->commands_since_idle_or_otag = 0;
1501                 } else {
1502                         hscb->control |= MSG_SIMPLE_TASK;
1503                 }
1504         }
1505
1506         hscb->cdb_len = cmd->cmd_len;
1507         if (hscb->cdb_len <= 12) {
1508                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1509         } else {
1510                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1511                 scb->flags |= SCB_CDB32_PTR;
1512         }
1513
1514         scb->platform_data->xfer_len = 0;
1515         ahc_set_residual(scb, 0);
1516         ahc_set_sense_residual(scb, 0);
1517         scb->sg_count = 0;
1518
1519         if (nseg > 0) {
1520                 struct  ahc_dma_seg *sg;
1521                 struct  scatterlist *cur_seg;
1522                 int i;
1523
1524                 /* Copy the segments into the SG list. */
1525                 sg = scb->sg_list;
1526                 /*
1527                  * The sg_count may be larger than nseg if
1528                  * a transfer crosses a 32bit page.
1529                  */
1530                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1531                         dma_addr_t addr;
1532                         bus_size_t len;
1533                         int consumed;
1534
1535                         addr = sg_dma_address(cur_seg);
1536                         len = sg_dma_len(cur_seg);
1537                         consumed = ahc_linux_map_seg(ahc, scb,
1538                                                      sg, addr, len);
1539                         sg += consumed;
1540                         scb->sg_count += consumed;
1541                 }
1542                 sg--;
1543                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1544
1545                 /*
1546                  * Reset the sg list pointer.
1547                  */
1548                 scb->hscb->sgptr =
1549                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1550
1551                 /*
1552                  * Copy the first SG into the "current"
1553                  * data pointer area.
1554                  */
1555                 scb->hscb->dataptr = scb->sg_list->addr;
1556                 scb->hscb->datacnt = scb->sg_list->len;
1557         } else {
1558                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1559                 scb->hscb->dataptr = 0;
1560                 scb->hscb->datacnt = 0;
1561                 scb->sg_count = 0;
1562         }
1563
1564         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1565         dev->openings--;
1566         dev->active++;
1567         dev->commands_issued++;
1568         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1569                 dev->commands_since_idle_or_otag++;
1570
1571         scb->flags |= SCB_ACTIVE;
1572         if (untagged_q) {
1573                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1574                 scb->flags |= SCB_UNTAGGEDQ;
1575         }
1576         ahc_queue_scb(ahc, scb);
1577         return 0;
1578 }
1579
1580 /*
1581  * SCSI controller interrupt handler.
1582  */
1583 irqreturn_t
1584 ahc_linux_isr(int irq, void *dev_id)
1585 {
1586         struct  ahc_softc *ahc;
1587         u_long  flags;
1588         int     ours;
1589
1590         ahc = (struct ahc_softc *) dev_id;
1591         ahc_lock(ahc, &flags);
1592         ours = ahc_intr(ahc);
1593         ahc_unlock(ahc, &flags);
1594         return IRQ_RETVAL(ours);
1595 }
1596
1597 void
1598 ahc_platform_flushwork(struct ahc_softc *ahc)
1599 {
1600
1601 }
1602
1603 void
1604 ahc_send_async(struct ahc_softc *ahc, char channel,
1605                u_int target, u_int lun, ac_code code)
1606 {
1607         switch (code) {
1608         case AC_TRANSFER_NEG:
1609         {
1610                 struct  scsi_target *starget;
1611                 struct  ahc_linux_target *targ;
1612                 struct  ahc_initiator_tinfo *tinfo;
1613                 struct  ahc_tmode_tstate *tstate;
1614                 int     target_offset;
1615                 unsigned int target_ppr_options;
1616
1617                 BUG_ON(target == CAM_TARGET_WILDCARD);
1618
1619                 tinfo = ahc_fetch_transinfo(ahc, channel,
1620                                                 channel == 'A' ? ahc->our_id
1621                                                                : ahc->our_id_b,
1622                                                 target, &tstate);
1623
1624                 /*
1625                  * Don't bother reporting results while
1626                  * negotiations are still pending.
1627                  */
1628                 if (tinfo->curr.period != tinfo->goal.period
1629                  || tinfo->curr.width != tinfo->goal.width
1630                  || tinfo->curr.offset != tinfo->goal.offset
1631                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1632                         if (bootverbose == 0)
1633                                 break;
1634
1635                 /*
1636                  * Don't bother reporting results that
1637                  * are identical to those last reported.
1638                  */
1639                 target_offset = target;
1640                 if (channel == 'B')
1641                         target_offset += 8;
1642                 starget = ahc->platform_data->starget[target_offset];
1643                 if (starget == NULL)
1644                         break;
1645                 targ = scsi_transport_target_data(starget);
1646
1647                 target_ppr_options =
1648                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1649                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1650                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1651
1652                 if (tinfo->curr.period == spi_period(starget)
1653                     && tinfo->curr.width == spi_width(starget)
1654                     && tinfo->curr.offset == spi_offset(starget)
1655                  && tinfo->curr.ppr_options == target_ppr_options)
1656                         if (bootverbose == 0)
1657                                 break;
1658
1659                 spi_period(starget) = tinfo->curr.period;
1660                 spi_width(starget) = tinfo->curr.width;
1661                 spi_offset(starget) = tinfo->curr.offset;
1662                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1663                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1664                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1665                 spi_display_xfer_agreement(starget);
1666                 break;
1667         }
1668         case AC_SENT_BDR:
1669         {
1670                 WARN_ON(lun != CAM_LUN_WILDCARD);
1671                 scsi_report_device_reset(ahc->platform_data->host,
1672                                          channel - 'A', target);
1673                 break;
1674         }
1675         case AC_BUS_RESET:
1676                 if (ahc->platform_data->host != NULL) {
1677                         scsi_report_bus_reset(ahc->platform_data->host,
1678                                               channel - 'A');
1679                 }
1680                 break;
1681         default:
1682                 panic("ahc_send_async: Unexpected async event");
1683         }
1684 }
1685
1686 /*
1687  * Calls the higher level scsi done function and frees the scb.
1688  */
1689 void
1690 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1691 {
1692         struct scsi_cmnd *cmd;
1693         struct     ahc_linux_device *dev;
1694
1695         LIST_REMOVE(scb, pending_links);
1696         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1697                 struct scb_tailq *untagged_q;
1698                 int target_offset;
1699
1700                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1701                 untagged_q = &(ahc->untagged_queues[target_offset]);
1702                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1703                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1704         } else if ((scb->flags & SCB_ACTIVE) == 0) {
1705                 /*
1706                  * Transactions aborted from the untagged queue may
1707                  * not have been dispatched to the controller, so
1708                  * only check the SCB_ACTIVE flag for tagged transactions.
1709                  */
1710                 printk("SCB %d done'd twice\n", scb->hscb->tag);
1711                 ahc_dump_card_state(ahc);
1712                 panic("Stopping for safety");
1713         }
1714         cmd = scb->io_ctx;
1715         dev = scb->platform_data->dev;
1716         dev->active--;
1717         dev->openings++;
1718         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1719                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1720                 dev->qfrozen--;
1721         }
1722         ahc_linux_unmap_scb(ahc, scb);
1723
1724         /*
1725          * Guard against stale sense data.
1726          * The Linux mid-layer assumes that sense
1727          * was retrieved anytime the first byte of
1728          * the sense buffer looks "sane".
1729          */
1730         cmd->sense_buffer[0] = 0;
1731         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1732                 uint32_t amount_xferred;
1733
1734                 amount_xferred =
1735                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1736                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1737 #ifdef AHC_DEBUG
1738                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1739                                 ahc_print_path(ahc, scb);
1740                                 printk("Set CAM_UNCOR_PARITY\n");
1741                         }
1742 #endif
1743                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1744 #ifdef AHC_REPORT_UNDERFLOWS
1745                 /*
1746                  * This code is disabled by default as some
1747                  * clients of the SCSI system do not properly
1748                  * initialize the underflow parameter.  This
1749                  * results in spurious termination of commands
1750                  * that complete as expected (e.g. underflow is
1751                  * allowed as command can return variable amounts
1752                  * of data.
1753                  */
1754                 } else if (amount_xferred < scb->io_ctx->underflow) {
1755                         u_int i;
1756
1757                         ahc_print_path(ahc, scb);
1758                         printk("CDB:");
1759                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1760                                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
1761                         printk("\n");
1762                         ahc_print_path(ahc, scb);
1763                         printk("Saw underflow (%ld of %ld bytes). "
1764                                "Treated as error\n",
1765                                 ahc_get_residual(scb),
1766                                 ahc_get_transfer_length(scb));
1767                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1768 #endif
1769                 } else {
1770                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1771                 }
1772         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1773                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1774         }
1775
1776         if (dev->openings == 1
1777          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1778          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1779                 dev->tag_success_count++;
1780         /*
1781          * Some devices deal with temporary internal resource
1782          * shortages by returning queue full.  When the queue
1783          * full occurrs, we throttle back.  Slowly try to get
1784          * back to our previous queue depth.
1785          */
1786         if ((dev->openings + dev->active) < dev->maxtags
1787          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1788                 dev->tag_success_count = 0;
1789                 dev->openings++;
1790         }
1791
1792         if (dev->active == 0)
1793                 dev->commands_since_idle_or_otag = 0;
1794
1795         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1796                 printk("Recovery SCB completes\n");
1797                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1798                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1799                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1800
1801                 if (ahc->platform_data->eh_done)
1802                         complete(ahc->platform_data->eh_done);
1803         }
1804
1805         ahc_free_scb(ahc, scb);
1806         ahc_linux_queue_cmd_complete(ahc, cmd);
1807 }
1808
1809 static void
1810 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1811                              struct scsi_device *sdev, struct scb *scb)
1812 {
1813         struct  ahc_devinfo devinfo;
1814         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1815
1816         ahc_compile_devinfo(&devinfo,
1817                             ahc->our_id,
1818                             sdev->sdev_target->id, sdev->lun,
1819                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1820                             ROLE_INITIATOR);
1821
1822         /*
1823          * We don't currently trust the mid-layer to
1824          * properly deal with queue full or busy.  So,
1825          * when one occurs, we tell the mid-layer to
1826          * unconditionally requeue the command to us
1827          * so that we can retry it ourselves.  We also
1828          * implement our own throttling mechanism so
1829          * we don't clobber the device with too many
1830          * commands.
1831          */
1832         switch (ahc_get_scsi_status(scb)) {
1833         default:
1834                 break;
1835         case SCSI_STATUS_CHECK_COND:
1836         case SCSI_STATUS_CMD_TERMINATED:
1837         {
1838                 struct scsi_cmnd *cmd;
1839
1840                 /*
1841                  * Copy sense information to the OS's cmd
1842                  * structure if it is available.
1843                  */
1844                 cmd = scb->io_ctx;
1845                 if (scb->flags & SCB_SENSE) {
1846                         u_int sense_size;
1847
1848                         sense_size = min(sizeof(struct scsi_sense_data)
1849                                        - ahc_get_sense_residual(scb),
1850                                          (u_long)SCSI_SENSE_BUFFERSIZE);
1851                         memcpy(cmd->sense_buffer,
1852                                ahc_get_sense_buf(ahc, scb), sense_size);
1853                         if (sense_size < SCSI_SENSE_BUFFERSIZE)
1854                                 memset(&cmd->sense_buffer[sense_size], 0,
1855                                        SCSI_SENSE_BUFFERSIZE - sense_size);
1856                         cmd->result |= (DRIVER_SENSE << 24);
1857 #ifdef AHC_DEBUG
1858                         if (ahc_debug & AHC_SHOW_SENSE) {
1859                                 int i;
1860
1861                                 printk("Copied %d bytes of sense data:",
1862                                        sense_size);
1863                                 for (i = 0; i < sense_size; i++) {
1864                                         if ((i & 0xF) == 0)
1865                                                 printk("\n");
1866                                         printk("0x%x ", cmd->sense_buffer[i]);
1867                                 }
1868                                 printk("\n");
1869                         }
1870 #endif
1871                 }
1872                 break;
1873         }
1874         case SCSI_STATUS_QUEUE_FULL:
1875         {
1876                 /*
1877                  * By the time the core driver has returned this
1878                  * command, all other commands that were queued
1879                  * to us but not the device have been returned.
1880                  * This ensures that dev->active is equal to
1881                  * the number of commands actually queued to
1882                  * the device.
1883                  */
1884                 dev->tag_success_count = 0;
1885                 if (dev->active != 0) {
1886                         /*
1887                          * Drop our opening count to the number
1888                          * of commands currently outstanding.
1889                          */
1890                         dev->openings = 0;
1891 /*
1892                         ahc_print_path(ahc, scb);
1893                         printk("Dropping tag count to %d\n", dev->active);
1894  */
1895                         if (dev->active == dev->tags_on_last_queuefull) {
1896
1897                                 dev->last_queuefull_same_count++;
1898                                 /*
1899                                  * If we repeatedly see a queue full
1900                                  * at the same queue depth, this
1901                                  * device has a fixed number of tag
1902                                  * slots.  Lock in this tag depth
1903                                  * so we stop seeing queue fulls from
1904                                  * this device.
1905                                  */
1906                                 if (dev->last_queuefull_same_count
1907                                  == AHC_LOCK_TAGS_COUNT) {
1908                                         dev->maxtags = dev->active;
1909                                         ahc_print_path(ahc, scb);
1910                                         printk("Locking max tag count at %d\n",
1911                                                dev->active);
1912                                 }
1913                         } else {
1914                                 dev->tags_on_last_queuefull = dev->active;
1915                                 dev->last_queuefull_same_count = 0;
1916                         }
1917                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1918                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1919                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1920                                      (dev->flags & AHC_DEV_Q_BASIC)
1921                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1922                         break;
1923                 }
1924                 /*
1925                  * Drop down to a single opening, and treat this
1926                  * as if the target returned BUSY SCSI status.
1927                  */
1928                 dev->openings = 1;
1929                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1930                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1931                              (dev->flags & AHC_DEV_Q_BASIC)
1932                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1933                 break;
1934         }
1935         }
1936 }
1937
1938 static void
1939 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1940 {
1941         /*
1942          * Map CAM error codes into Linux Error codes.  We
1943          * avoid the conversion so that the DV code has the
1944          * full error information available when making
1945          * state change decisions.
1946          */
1947         {
1948                 u_int new_status;
1949
1950                 switch (ahc_cmd_get_transaction_status(cmd)) {
1951                 case CAM_REQ_INPROG:
1952                 case CAM_REQ_CMP:
1953                 case CAM_SCSI_STATUS_ERROR:
1954                         new_status = DID_OK;
1955                         break;
1956                 case CAM_REQ_ABORTED:
1957                         new_status = DID_ABORT;
1958                         break;
1959                 case CAM_BUSY:
1960                         new_status = DID_BUS_BUSY;
1961                         break;
1962                 case CAM_REQ_INVALID:
1963                 case CAM_PATH_INVALID:
1964                         new_status = DID_BAD_TARGET;
1965                         break;
1966                 case CAM_SEL_TIMEOUT:
1967                         new_status = DID_NO_CONNECT;
1968                         break;
1969                 case CAM_SCSI_BUS_RESET:
1970                 case CAM_BDR_SENT:
1971                         new_status = DID_RESET;
1972                         break;
1973                 case CAM_UNCOR_PARITY:
1974                         new_status = DID_PARITY;
1975                         break;
1976                 case CAM_CMD_TIMEOUT:
1977                         new_status = DID_TIME_OUT;
1978                         break;
1979                 case CAM_UA_ABORT:
1980                 case CAM_REQ_CMP_ERR:
1981                 case CAM_AUTOSENSE_FAIL:
1982                 case CAM_NO_HBA:
1983                 case CAM_DATA_RUN_ERR:
1984                 case CAM_UNEXP_BUSFREE:
1985                 case CAM_SEQUENCE_FAIL:
1986                 case CAM_CCB_LEN_ERR:
1987                 case CAM_PROVIDE_FAIL:
1988                 case CAM_REQ_TERMIO:
1989                 case CAM_UNREC_HBA_ERROR:
1990                 case CAM_REQ_TOO_BIG:
1991                         new_status = DID_ERROR;
1992                         break;
1993                 case CAM_REQUEUE_REQ:
1994                         new_status = DID_REQUEUE;
1995                         break;
1996                 default:
1997                         /* We should never get here */
1998                         new_status = DID_ERROR;
1999                         break;
2000                 }
2001
2002                 ahc_cmd_set_transaction_status(cmd, new_status);
2003         }
2004
2005         cmd->scsi_done(cmd);
2006 }
2007
2008 static void
2009 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2010 {
2011         unsigned long s;
2012
2013         ahc_lock(ahc, &s);
2014         ahc->platform_data->qfrozen++;
2015         if (ahc->platform_data->qfrozen == 1) {
2016                 scsi_block_requests(ahc->platform_data->host);
2017
2018                 /* XXX What about Twin channels? */
2019                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2020                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2021                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2022         }
2023         ahc_unlock(ahc, &s);
2024 }
2025
2026 static void
2027 ahc_linux_release_simq(struct ahc_softc *ahc)
2028 {
2029         u_long s;
2030         int    unblock_reqs;
2031
2032         unblock_reqs = 0;
2033         ahc_lock(ahc, &s);
2034         if (ahc->platform_data->qfrozen > 0)
2035                 ahc->platform_data->qfrozen--;
2036         if (ahc->platform_data->qfrozen == 0)
2037                 unblock_reqs = 1;
2038         ahc_unlock(ahc, &s);
2039         /*
2040          * There is still a race here.  The mid-layer
2041          * should keep its own freeze count and use
2042          * a bottom half handler to run the queues
2043          * so we can unblock with our own lock held.
2044          */
2045         if (unblock_reqs)
2046                 scsi_unblock_requests(ahc->platform_data->host);
2047 }
2048
2049 static int
2050 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2051 {
2052         struct ahc_softc *ahc;
2053         struct ahc_linux_device *dev;
2054         struct scb *pending_scb;
2055         u_int  saved_scbptr;
2056         u_int  active_scb_index;
2057         u_int  last_phase;
2058         u_int  saved_scsiid;
2059         u_int  cdb_byte;
2060         int    retval;
2061         int    was_paused;
2062         int    paused;
2063         int    wait;
2064         int    disconnected;
2065         unsigned long flags;
2066
2067         pending_scb = NULL;
2068         paused = FALSE;
2069         wait = FALSE;
2070         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2071
2072         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2073                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2074
2075         printk("CDB:");
2076         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2077                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
2078         printk("\n");
2079
2080         ahc_lock(ahc, &flags);
2081
2082         /*
2083          * First determine if we currently own this command.
2084          * Start by searching the device queue.  If not found
2085          * there, check the pending_scb list.  If not found
2086          * at all, and the system wanted us to just abort the
2087          * command, return success.
2088          */
2089         dev = scsi_transport_device_data(cmd->device);
2090
2091         if (dev == NULL) {
2092                 /*
2093                  * No target device for this command exists,
2094                  * so we must not still own the command.
2095                  */
2096                 printk("%s:%d:%d:%d: Is not an active device\n",
2097                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2098                        (u8)cmd->device->lun);
2099                 retval = SUCCESS;
2100                 goto no_cmd;
2101         }
2102
2103         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2104          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2105                                        cmd->device->channel + 'A',
2106                                        (u8)cmd->device->lun,
2107                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2108                 printk("%s:%d:%d:%d: Command found on untagged queue\n",
2109                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2110                        (u8)cmd->device->lun);
2111                 retval = SUCCESS;
2112                 goto done;
2113         }
2114
2115         /*
2116          * See if we can find a matching cmd in the pending list.
2117          */
2118         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2119                 if (pending_scb->io_ctx == cmd)
2120                         break;
2121         }
2122
2123         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2124
2125                 /* Any SCB for this device will do for a target reset */
2126                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2127                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2128                                           scmd_channel(cmd) + 'A',
2129                                           CAM_LUN_WILDCARD,
2130                                           SCB_LIST_NULL, ROLE_INITIATOR))
2131                                 break;
2132                 }
2133         }
2134
2135         if (pending_scb == NULL) {
2136                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2137                 goto no_cmd;
2138         }
2139
2140         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2141                 /*
2142                  * We can't queue two recovery actions using the same SCB
2143                  */
2144                 retval = FAILED;
2145                 goto  done;
2146         }
2147
2148         /*
2149          * Ensure that the card doesn't do anything
2150          * behind our back and that we didn't "just" miss
2151          * an interrupt that would affect this cmd.
2152          */
2153         was_paused = ahc_is_paused(ahc);
2154         ahc_pause_and_flushwork(ahc);
2155         paused = TRUE;
2156
2157         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2158                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2159                 goto no_cmd;
2160         }
2161
2162         printk("%s: At time of recovery, card was %spaused\n",
2163                ahc_name(ahc), was_paused ? "" : "not ");
2164         ahc_dump_card_state(ahc);
2165
2166         disconnected = TRUE;
2167         if (flag == SCB_ABORT) {
2168                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2169                                        cmd->device->channel + 'A',
2170                                        cmd->device->lun,
2171                                        pending_scb->hscb->tag,
2172                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2173                                        SEARCH_COMPLETE) > 0) {
2174                         printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2175                                ahc_name(ahc), cmd->device->channel,
2176                                cmd->device->id, (u8)cmd->device->lun);
2177                         retval = SUCCESS;
2178                         goto done;
2179                 }
2180         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2181                                       cmd->device->channel + 'A',
2182                                       cmd->device->lun,
2183                                       pending_scb->hscb->tag,
2184                                       ROLE_INITIATOR, /*status*/0,
2185                                       SEARCH_COUNT) > 0) {
2186                 disconnected = FALSE;
2187         }
2188
2189         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2190                 struct scb *bus_scb;
2191
2192                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2193                 if (bus_scb == pending_scb)
2194                         disconnected = FALSE;
2195                 else if (flag != SCB_ABORT
2196                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2197                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2198                         disconnected = FALSE;
2199         }
2200
2201         /*
2202          * At this point, pending_scb is the scb associated with the
2203          * passed in command.  That command is currently active on the
2204          * bus, is in the disconnected state, or we're hoping to find
2205          * a command for the same target active on the bus to abuse to
2206          * send a BDR.  Queue the appropriate message based on which of
2207          * these states we are in.
2208          */
2209         last_phase = ahc_inb(ahc, LASTPHASE);
2210         saved_scbptr = ahc_inb(ahc, SCBPTR);
2211         active_scb_index = ahc_inb(ahc, SCB_TAG);
2212         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2213         if (last_phase != P_BUSFREE
2214          && (pending_scb->hscb->tag == active_scb_index
2215           || (flag == SCB_DEVICE_RESET
2216            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2217
2218                 /*
2219                  * We're active on the bus, so assert ATN
2220                  * and hope that the target responds.
2221                  */
2222                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2223                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2224                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2225                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2226                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2227                 wait = TRUE;
2228         } else if (disconnected) {
2229
2230                 /*
2231                  * Actually re-queue this SCB in an attempt
2232                  * to select the device before it reconnects.
2233                  * In either case (selection or reselection),
2234                  * we will now issue the approprate message
2235                  * to the timed-out device.
2236                  *
2237                  * Set the MK_MESSAGE control bit indicating
2238                  * that we desire to send a message.  We
2239                  * also set the disconnected flag since
2240                  * in the paging case there is no guarantee
2241                  * that our SCB control byte matches the
2242                  * version on the card.  We don't want the
2243                  * sequencer to abort the command thinking
2244                  * an unsolicited reselection occurred.
2245                  */
2246                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2247                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2248
2249                 /*
2250                  * Remove any cached copy of this SCB in the
2251                  * disconnected list in preparation for the
2252                  * queuing of our abort SCB.  We use the
2253                  * same element in the SCB, SCB_NEXT, for
2254                  * both the qinfifo and the disconnected list.
2255                  */
2256                 ahc_search_disc_list(ahc, cmd->device->id,
2257                                      cmd->device->channel + 'A',
2258                                      cmd->device->lun, pending_scb->hscb->tag,
2259                                      /*stop_on_first*/TRUE,
2260                                      /*remove*/TRUE,
2261                                      /*save_state*/FALSE);
2262
2263                 /*
2264                  * In the non-paging case, the sequencer will
2265                  * never re-reference the in-core SCB.
2266                  * To make sure we are notified during
2267                  * reselection, set the MK_MESSAGE flag in
2268                  * the card's copy of the SCB.
2269                  */
2270                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2271                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2272                         ahc_outb(ahc, SCB_CONTROL,
2273                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2274                 }
2275
2276                 /*
2277                  * Clear out any entries in the QINFIFO first
2278                  * so we are the next SCB for this target
2279                  * to run.
2280                  */
2281                 ahc_search_qinfifo(ahc, cmd->device->id,
2282                                    cmd->device->channel + 'A',
2283                                    cmd->device->lun, SCB_LIST_NULL,
2284                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2285                                    SEARCH_COMPLETE);
2286                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2287                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2288                 ahc_print_path(ahc, pending_scb);
2289                 printk("Device is disconnected, re-queuing SCB\n");
2290                 wait = TRUE;
2291         } else {
2292                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2293                 retval = FAILED;
2294                 goto done;
2295         }
2296
2297 no_cmd:
2298         /*
2299          * Our assumption is that if we don't have the command, no
2300          * recovery action was required, so we return success.  Again,
2301          * the semantics of the mid-layer recovery engine are not
2302          * well defined, so this may change in time.
2303          */
2304         retval = SUCCESS;
2305 done:
2306         if (paused)
2307                 ahc_unpause(ahc);
2308         if (wait) {
2309                 DECLARE_COMPLETION_ONSTACK(done);
2310
2311                 ahc->platform_data->eh_done = &done;
2312                 ahc_unlock(ahc, &flags);
2313
2314                 printk("Recovery code sleeping\n");
2315                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2316                         ahc_lock(ahc, &flags);
2317                         ahc->platform_data->eh_done = NULL;
2318                         ahc_unlock(ahc, &flags);
2319
2320                         printk("Timer Expired\n");
2321                         retval = FAILED;
2322                 }
2323                 printk("Recovery code awake\n");
2324         } else
2325                 ahc_unlock(ahc, &flags);
2326         return (retval);
2327 }
2328
2329 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2330 {
2331         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2332         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2333         struct ahc_devinfo devinfo;
2334         unsigned long flags;
2335
2336         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2337                             starget->channel + 'A', ROLE_INITIATOR);
2338         ahc_lock(ahc, &flags);
2339         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2340         ahc_unlock(ahc, &flags);
2341 }
2342
2343 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2344 {
2345         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2346         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2347         struct ahc_tmode_tstate *tstate;
2348         struct ahc_initiator_tinfo *tinfo
2349                 = ahc_fetch_transinfo(ahc,
2350                                       starget->channel + 'A',
2351                                       shost->this_id, starget->id, &tstate);
2352         struct ahc_devinfo devinfo;
2353         unsigned int ppr_options = tinfo->goal.ppr_options;
2354         unsigned long flags;
2355         unsigned long offset = tinfo->goal.offset;
2356         const struct ahc_syncrate *syncrate;
2357
2358         if (offset == 0)
2359                 offset = MAX_OFFSET;
2360
2361         if (period < 9)
2362                 period = 9;     /* 12.5ns is our minimum */
2363         if (period == 9) {
2364                 if (spi_max_width(starget))
2365                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2366                 else
2367                         /* need wide for DT and need DT for 12.5 ns */
2368                         period = 10;
2369         }
2370
2371         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2372                             starget->channel + 'A', ROLE_INITIATOR);
2373
2374         /* all PPR requests apart from QAS require wide transfers */
2375         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2376                 if (spi_width(starget) == 0)
2377                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2378         }
2379
2380         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2381         ahc_lock(ahc, &flags);
2382         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2383                          ppr_options, AHC_TRANS_GOAL, FALSE);
2384         ahc_unlock(ahc, &flags);
2385 }
2386
2387 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2388 {
2389         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2390         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2391         struct ahc_tmode_tstate *tstate;
2392         struct ahc_initiator_tinfo *tinfo
2393                 = ahc_fetch_transinfo(ahc,
2394                                       starget->channel + 'A',
2395                                       shost->this_id, starget->id, &tstate);
2396         struct ahc_devinfo devinfo;
2397         unsigned int ppr_options = 0;
2398         unsigned int period = 0;
2399         unsigned long flags;
2400         const struct ahc_syncrate *syncrate = NULL;
2401
2402         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2403                             starget->channel + 'A', ROLE_INITIATOR);
2404         if (offset != 0) {
2405                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2406                 period = tinfo->goal.period;
2407                 ppr_options = tinfo->goal.ppr_options;
2408         }
2409         ahc_lock(ahc, &flags);
2410         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2411                          ppr_options, AHC_TRANS_GOAL, FALSE);
2412         ahc_unlock(ahc, &flags);
2413 }
2414
2415 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2416 {
2417         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2418         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2419         struct ahc_tmode_tstate *tstate;
2420         struct ahc_initiator_tinfo *tinfo
2421                 = ahc_fetch_transinfo(ahc,
2422                                       starget->channel + 'A',
2423                                       shost->this_id, starget->id, &tstate);
2424         struct ahc_devinfo devinfo;
2425         unsigned int ppr_options = tinfo->goal.ppr_options
2426                 & ~MSG_EXT_PPR_DT_REQ;
2427         unsigned int period = tinfo->goal.period;
2428         unsigned int width = tinfo->goal.width;
2429         unsigned long flags;
2430         const struct ahc_syncrate *syncrate;
2431
2432         if (dt && spi_max_width(starget)) {
2433                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2434                 if (!width)
2435                         ahc_linux_set_width(starget, 1);
2436         } else if (period == 9)
2437                 period = 10;    /* if resetting DT, period must be >= 25ns */
2438
2439         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2440                             starget->channel + 'A', ROLE_INITIATOR);
2441         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2442         ahc_lock(ahc, &flags);
2443         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2444                          ppr_options, AHC_TRANS_GOAL, FALSE);
2445         ahc_unlock(ahc, &flags);
2446 }
2447
2448 #if 0
2449 /* FIXME: This code claims to support IU and QAS.  However, the actual
2450  * sequencer code and aic7xxx_core have no support for these parameters and
2451  * will get into a bad state if they're negotiated.  Do not enable this
2452  * unless you know what you're doing */
2453 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2454 {
2455         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2456         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2457         struct ahc_tmode_tstate *tstate;
2458         struct ahc_initiator_tinfo *tinfo
2459                 = ahc_fetch_transinfo(ahc,
2460                                       starget->channel + 'A',
2461                                       shost->this_id, starget->id, &tstate);
2462         struct ahc_devinfo devinfo;
2463         unsigned int ppr_options = tinfo->goal.ppr_options
2464                 & ~MSG_EXT_PPR_QAS_REQ;
2465         unsigned int period = tinfo->goal.period;
2466         unsigned long flags;
2467         struct ahc_syncrate *syncrate;
2468
2469         if (qas)
2470                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2471
2472         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2473                             starget->channel + 'A', ROLE_INITIATOR);
2474         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2475         ahc_lock(ahc, &flags);
2476         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2477                          ppr_options, AHC_TRANS_GOAL, FALSE);
2478         ahc_unlock(ahc, &flags);
2479 }
2480
2481 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2482 {
2483         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2484         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2485         struct ahc_tmode_tstate *tstate;
2486         struct ahc_initiator_tinfo *tinfo
2487                 = ahc_fetch_transinfo(ahc,
2488                                       starget->channel + 'A',
2489                                       shost->this_id, starget->id, &tstate);
2490         struct ahc_devinfo devinfo;
2491         unsigned int ppr_options = tinfo->goal.ppr_options
2492                 & ~MSG_EXT_PPR_IU_REQ;
2493         unsigned int period = tinfo->goal.period;
2494         unsigned long flags;
2495         struct ahc_syncrate *syncrate;
2496
2497         if (iu)
2498                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2499
2500         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2501                             starget->channel + 'A', ROLE_INITIATOR);
2502         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2503         ahc_lock(ahc, &flags);
2504         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2505                          ppr_options, AHC_TRANS_GOAL, FALSE);
2506         ahc_unlock(ahc, &flags);
2507 }
2508 #endif
2509
2510 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2511 {
2512         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2513         unsigned long flags;
2514         u8 mode;
2515
2516         if (!(ahc->features & AHC_ULTRA2)) {
2517                 /* non-LVD chipset, may not have SBLKCTL reg */
2518                 spi_signalling(shost) =
2519                         ahc->features & AHC_HVD ?
2520                         SPI_SIGNAL_HVD :
2521                         SPI_SIGNAL_SE;
2522                 return;
2523         }
2524
2525         ahc_lock(ahc, &flags);
2526         ahc_pause(ahc);
2527         mode = ahc_inb(ahc, SBLKCTL);
2528         ahc_unpause(ahc);
2529         ahc_unlock(ahc, &flags);
2530
2531         if (mode & ENAB40)
2532                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2533         else if (mode & ENAB20)
2534                 spi_signalling(shost) = SPI_SIGNAL_SE;
2535         else
2536                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2537 }
2538
2539 static struct spi_function_template ahc_linux_transport_functions = {
2540         .set_offset     = ahc_linux_set_offset,
2541         .show_offset    = 1,
2542         .set_period     = ahc_linux_set_period,
2543         .show_period    = 1,
2544         .set_width      = ahc_linux_set_width,
2545         .show_width     = 1,
2546         .set_dt         = ahc_linux_set_dt,
2547         .show_dt        = 1,
2548 #if 0
2549         .set_iu         = ahc_linux_set_iu,
2550         .show_iu        = 1,
2551         .set_qas        = ahc_linux_set_qas,
2552         .show_qas       = 1,
2553 #endif
2554         .get_signalling = ahc_linux_get_signalling,
2555 };
2556
2557
2558
2559 static int __init
2560 ahc_linux_init(void)
2561 {
2562         /*
2563          * If we've been passed any parameters, process them now.
2564          */
2565         if (aic7xxx)
2566                 aic7xxx_setup(aic7xxx);
2567
2568         ahc_linux_transport_template =
2569                 spi_attach_transport(&ahc_linux_transport_functions);
2570         if (!ahc_linux_transport_template)
2571                 return -ENODEV;
2572
2573         scsi_transport_reserve_device(ahc_linux_transport_template,
2574                                       sizeof(struct ahc_linux_device));
2575
2576         ahc_linux_pci_init();
2577         ahc_linux_eisa_init();
2578         return 0;
2579 }
2580
2581 static void
2582 ahc_linux_exit(void)
2583 {
2584         ahc_linux_pci_exit();
2585         ahc_linux_eisa_exit();
2586         spi_release_transport(ahc_linux_transport_template);
2587 }
2588
2589 module_init(ahc_linux_init);
2590 module_exit(ahc_linux_exit);