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 /*
 129  * Include aiclib.c as part of our
 130  * "module dependencies are hard" work around.
 131  */
 132 #include "aiclib.c"
 133
 134 #include <linux/init.h>         /* __setup */
 135 #include <linux/mm.h>           /* For fetching system memory size */
 136 #include <linux/blkdev.h>               /* For block_size() */
 137 #include <linux/delay.h>        /* For ssleep/msleep */
 138
 139
 140 /*
 141  * Set this to the delay in seconds after SCSI bus reset.
 142  * Note, we honor this only for the initial bus reset.
 143  * The scsi error recovery code performs its own bus settle
 144  * delay handling for error recovery actions.
 145  */
 146 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 147 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 148 #else
 149 #define AIC7XXX_RESET_DELAY 5000
 150 #endif
 151
 152 /*
 153  * Control collection of SCSI transfer statistics for the /proc filesystem.
 154  *
 155  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 156  * NOTE: This does affect performance since it has to maintain statistics.
 157  */
 158 #ifdef CONFIG_AIC7XXX_PROC_STATS
 159 #define AIC7XXX_PROC_STATS
 160 #endif
 161
 162 /*
 163  * To change the default number of tagged transactions allowed per-device,
 164  * add a line to the lilo.conf file like:
 165  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 166  * which will result in the first four devices on the first two
 167  * controllers being set to a tagged queue depth of 32.
 168  *
 169  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 170  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 171  * for channel 1.
 172  */
 173 typedef struct {
 174         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 175 } adapter_tag_info_t;
 176
 177 /*
 178  * Modify this as you see fit for your system.
 179  *
 180  * 0                    tagged queuing disabled
 181  * 1 <= n <= 253        n == max tags ever dispatched.
 182  *
 183  * The driver will throttle the number of commands dispatched to a
 184  * device if it returns queue full.  For devices with a fixed maximum
 185  * queue depth, the driver will eventually determine this depth and
 186  * lock it in (a console message is printed to indicate that a lock
 187  * has occurred).  On some devices, queue full is returned for a temporary
 188  * resource shortage.  These devices will return queue full at varying
 189  * depths.  The driver will throttle back when the queue fulls occur and
 190  * attempt to slowly increase the depth over time as the device recovers
 191  * from the resource shortage.
 192  *
 193  * In this example, the first line will disable tagged queueing for all
 194  * the devices on the first probed aic7xxx adapter.
 195  *
 196  * The second line enables tagged queueing with 4 commands/LUN for IDs
 197  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 198  * driver to attempt to use up to 64 tags for ID 1.
 199  *
 200  * The third line is the same as the first line.
 201  *
 202  * The fourth line disables tagged queueing for devices 0 and 3.  It
 203  * enables tagged queueing for the other IDs, with 16 commands/LUN
 204  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 205  * IDs 2, 5-7, and 9-15.
 206  */
 207
 208 /*
 209  * NOTE: The below structure is for reference only, the actual structure
 210  *       to modify in order to change things is just below this comment block.
 211 adapter_tag_info_t aic7xxx_tag_info[] =
 212 {
 213         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 214         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 215         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 216         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 217 };
 218 */
 219
 220 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 221 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 222 #else
 223 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 224 #endif
 225
 226 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 227         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 228         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 229         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 230         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 231         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 232         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 233         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 234         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 235 }
 236
 237 /*
 238  * By default, use the number of commands specified by
 239  * the users kernel configuration.
 240  */
 241 static adapter_tag_info_t aic7xxx_tag_info[] =
 242 {
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 245         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 246         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 252         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 253         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 254         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 255         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 256         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 257         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 258         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 259 };
 260
 261 /*
 262  * There should be a specific return value for this in scsi.h, but
 263  * it seems that most drivers ignore it.
 264  */
 265 #define DID_UNDERFLOW   DID_ERROR
 266
 267 void
 268 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 269 {
 270         printk("(scsi%d:%c:%d:%d): ",
 271                ahc->platform_data->host->host_no,
 272                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 273                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 274                scb != NULL ? SCB_GET_LUN(scb) : -1);
 275 }
 276
 277 /*
 278  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 279  *       cards in the system.  This should be fixed.  Exceptions to this
 280  *       rule are noted in the comments.
 281  */
 282
 283 /*
 284  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 285  * has no effect on any later resets that might occur due to things like
 286  * SCSI bus timeouts.
 287  */
 288 static uint32_t aic7xxx_no_reset;
 289
 290 /*
 291  * Should we force EXTENDED translation on a controller.
 292  *     0 == Use whatever is in the SEEPROM or default to off
 293  *     1 == Use whatever is in the SEEPROM or default to on
 294  */
 295 static uint32_t aic7xxx_extended;
 296
 297 /*
 298  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 299  * dubious at best.  To my knowledge, this option has never actually
 300  * solved a PCI parity problem, but on certain machines with broken PCI
 301  * chipset configurations where stray PCI transactions with bad parity are
 302  * the norm rather than the exception, the error messages can be overwelming.
 303  * It's included in the driver for completeness.
 304  *   0     = Shut off PCI parity check
 305  *   non-0 = reverse polarity pci parity checking
 306  */
 307 static uint32_t aic7xxx_pci_parity = ~0;
 308
 309 /*
 310  * There are lots of broken chipsets in the world.  Some of them will
 311  * violate the PCI spec when we issue byte sized memory writes to our
 312  * controller.  I/O mapped register access, if allowed by the given
 313  * platform, will work in almost all cases.
 314  */
 315 uint32_t aic7xxx_allow_memio = ~0;
 316
 317 /*
 318  * So that we can set how long each device is given as a selection timeout.
 319  * The table of values goes like this:
 320  *   0 - 256ms
 321  *   1 - 128ms
 322  *   2 - 64ms
 323  *   3 - 32ms
 324  * We default to 256ms because some older devices need a longer time
 325  * to respond to initial selection.
 326  */
 327 static uint32_t aic7xxx_seltime;
 328
 329 /*
 330  * Certain devices do not perform any aging on commands.  Should the
 331  * device be saturated by commands in one portion of the disk, it is
 332  * possible for transactions on far away sectors to never be serviced.
 333  * To handle these devices, we can periodically send an ordered tag to
 334  * force all outstanding transactions to be serviced prior to a new
 335  * transaction.
 336  */
 337 uint32_t aic7xxx_periodic_otag;
 338
 339 /*
 340  * Module information and settable options.
 341  */
 342 static char *aic7xxx = NULL;
 343
 344 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 345 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
 346 MODULE_LICENSE("Dual BSD/GPL");
 347 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 348 module_param(aic7xxx, charp, 0444);
 349 MODULE_PARM_DESC(aic7xxx,
 350 "period delimited, options string.\n"
 351 "       verbose                 Enable verbose/diagnostic logging\n"
 352 "       allow_memio             Allow device registers to be memory mapped\n"
 353 "       debug                   Bitmask of debug values to enable\n"
 354 "       no_probe                Toggle EISA/VLB controller probing\n"
 355 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 356 "       no_reset                Supress initial bus resets\n"
 357 "       extended                Enable extended geometry on all controllers\n"
 358 "       periodic_otag           Send an ordered tagged transaction\n"
 359 "                               periodically to prevent tag starvation.\n"
 360 "                               This may be required by some older disk\n"
 361 "                               drives or RAID arrays.\n"
 362 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
 363 "       tag_info:<tag_str>      Set per-target tag depth\n"
 364 "       global_tag_depth:<int>  Global tag depth for every target\n"
 365 "                               on every bus\n"
 366 "       seltime:<int>           Selection Timeout\n"
 367 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 368 "\n"
 369 "       Sample /etc/modprobe.conf line:\n"
 370 "               Toggle EISA/VLB probing\n"
 371 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 372 "               Shorten the selection timeout to 128ms\n"
 373 "\n"
 374 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 375 );
 376
 377 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 378                                          struct scsi_device *,
 379                                          struct scb *);
 380 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 381                                          struct scsi_cmnd *cmd);
 382 static void ahc_linux_sem_timeout(u_long arg);
 383 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 384 static void ahc_linux_release_simq(u_long arg);
 385 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 386 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 387 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 388                                      struct ahc_devinfo *devinfo);
 389 static void ahc_linux_device_queue_depth(struct scsi_device *);
 390 static int ahc_linux_run_command(struct ahc_softc*,
 391                                  struct ahc_linux_device *,
 392                                  struct scsi_cmnd *);
 393 static void ahc_linux_setup_tag_info_global(char *p);
 394 static aic_option_callback_t ahc_linux_setup_tag_info;
 395 static int  aic7xxx_setup(char *s);
 396
 397 static int ahc_linux_unit;
 398
 399
 400 /********************************* Inlines ************************************/
 401 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 402
 403 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 404                                       struct ahc_dma_seg *sg,
 405                                       dma_addr_t addr, bus_size_t len);
 406
 407 static __inline void
 408 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 409 {
 410         struct scsi_cmnd *cmd;
 411
 412         cmd = scb->io_ctx;
 413         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 414         if (cmd->use_sg != 0) {
 415                 struct scatterlist *sg;
 416
 417                 sg = (struct scatterlist *)cmd->request_buffer;
 418                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
 419                              cmd->sc_data_direction);
 420         } else if (cmd->request_bufflen != 0) {
 421                 pci_unmap_single(ahc->dev_softc,
 422                                  scb->platform_data->buf_busaddr,
 423                                  cmd->request_bufflen,
 424                                  cmd->sc_data_direction);
 425         }
 426 }
 427
 428 static __inline int
 429 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 430                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 431 {
 432         int      consumed;
 433
 434         if ((scb->sg_count + 1) > AHC_NSEG)
 435                 panic("Too few segs for dma mapping.  "
 436                       "Increase AHC_NSEG\n");
 437
 438         consumed = 1;
 439         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 440         scb->platform_data->xfer_len += len;
 441
 442         if (sizeof(dma_addr_t) > 4
 443          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 444                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 445
 446         sg->len = ahc_htole32(len);
 447         return (consumed);
 448 }
 449
 450 /*
 451  * Return a string describing the driver.
 452  */
 453 static const char *
 454 ahc_linux_info(struct Scsi_Host *host)
 455 {
 456         static char buffer[512];
 457         char    ahc_info[256];
 458         char   *bp;
 459         struct ahc_softc *ahc;
 460
 461         bp = &buffer[0];
 462         ahc = *(struct ahc_softc **)host->hostdata;
 463         memset(bp, 0, sizeof(buffer));
 464         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 465         strcat(bp, AIC7XXX_DRIVER_VERSION);
 466         strcat(bp, "\n");
 467         strcat(bp, "        <");
 468         strcat(bp, ahc->description);
 469         strcat(bp, ">\n");
 470         strcat(bp, "        ");
 471         ahc_controller_info(ahc, ahc_info);
 472         strcat(bp, ahc_info);
 473         strcat(bp, "\n");
 474
 475         return (bp);
 476 }
 477
 478 /*
 479  * Queue an SCB to the controller.
 480  */
 481 static int
 482 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 483 {
 484         struct   ahc_softc *ahc;
 485         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 486
 487         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 488
 489         /*
 490          * Save the callback on completion function.
 491          */
 492         cmd->scsi_done = scsi_done;
 493
 494         /*
 495          * Close the race of a command that was in the process of
 496          * being queued to us just as our simq was frozen.  Let
 497          * DV commands through so long as we are only frozen to
 498          * perform DV.
 499          */
 500         if (ahc->platform_data->qfrozen != 0)
 501                 return SCSI_MLQUEUE_HOST_BUSY;
 502
 503         cmd->result = CAM_REQ_INPROG << 16;
 504
 505         return ahc_linux_run_command(ahc, dev, cmd);
 506 }
 507
 508 static inline struct scsi_target **
 509 ahc_linux_target_in_softc(struct scsi_target *starget)
 510 {
 511         struct  ahc_softc *ahc =
 512                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 513         unsigned int target_offset;
 514
 515         target_offset = starget->id;
 516         if (starget->channel != 0)
 517                 target_offset += 8;
 518
 519         return &ahc->platform_data->starget[target_offset];
 520 }
 521
 522 static int
 523 ahc_linux_target_alloc(struct scsi_target *starget)
 524 {
 525         struct  ahc_softc *ahc =
 526                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 527         struct seeprom_config *sc = ahc->seep_config;
 528         unsigned long flags;
 529         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 530         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 531         unsigned short scsirate;
 532         struct ahc_devinfo devinfo;
 533         struct ahc_initiator_tinfo *tinfo;
 534         struct ahc_tmode_tstate *tstate;
 535         char channel = starget->channel + 'A';
 536         unsigned int our_id = ahc->our_id;
 537         unsigned int target_offset;
 538
 539         target_offset = starget->id;
 540         if (starget->channel != 0)
 541                 target_offset += 8;
 542
 543         if (starget->channel)
 544                 our_id = ahc->our_id_b;
 545
 546         ahc_lock(ahc, &flags);
 547
 548         BUG_ON(*ahc_targp != NULL);
 549
 550         *ahc_targp = starget;
 551         memset(targ, 0, sizeof(*targ));
 552
 553         if (sc) {
 554                 int maxsync = AHC_SYNCRATE_DT;
 555                 int ultra = 0;
 556                 int flags = sc->device_flags[target_offset];
 557
 558                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 559                     if (flags & CFSYNCHISULTRA)
 560                         ultra = 1;
 561                 } else if (flags & CFULTRAEN)
 562                         ultra = 1;
 563                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 564                  * change it to ultra=0, CFXFER = 0 */
 565                 if(ultra && (flags & CFXFER) == 0x04) {
 566                         ultra = 0;
 567                         flags &= ~CFXFER;
 568                 }
 569
 570                 if ((ahc->features & AHC_ULTRA2) != 0) {
 571                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 572                 } else {
 573                         scsirate = (flags & CFXFER) << 4;
 574                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 575                                 AHC_SYNCRATE_FAST;
 576                 }
 577                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 578                 if (!(flags & CFSYNCH))
 579                         spi_max_offset(starget) = 0;
 580                 spi_min_period(starget) =
 581                         ahc_find_period(ahc, scsirate, maxsync);
 582
 583                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 584                                             starget->id, &tstate);
 585         }
 586         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 587                             CAM_LUN_WILDCARD, channel,
 588                             ROLE_INITIATOR);
 589         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 590                          AHC_TRANS_GOAL, /*paused*/FALSE);
 591         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 592                       AHC_TRANS_GOAL, /*paused*/FALSE);
 593         ahc_unlock(ahc, &flags);
 594
 595         return 0;
 596 }
 597
 598 static void
 599 ahc_linux_target_destroy(struct scsi_target *starget)
 600 {
 601         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 602
 603         *ahc_targp = NULL;
 604 }
 605
 606 static int
 607 ahc_linux_slave_alloc(struct scsi_device *sdev)
 608 {
 609         struct  ahc_softc *ahc =
 610                 *((struct ahc_softc **)sdev->host->hostdata);
 611         struct scsi_target *starget = sdev->sdev_target;
 612         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 613         struct ahc_linux_device *dev;
 614
 615         if (bootverbose)
 616                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 617
 618         BUG_ON(targ->sdev[sdev->lun] != NULL);
 619
 620         dev = scsi_transport_device_data(sdev);
 621         memset(dev, 0, sizeof(*dev));
 622
 623         /*
 624          * We start out life using untagged
 625          * transactions of which we allow one.
 626          */
 627         dev->openings = 1;
 628
 629         /*
 630          * Set maxtags to 0.  This will be changed if we
 631          * later determine that we are dealing with
 632          * a tagged queuing capable device.
 633          */
 634         dev->maxtags = 0;
 635
 636         targ->sdev[sdev->lun] = sdev;
 637
 638         return 0;
 639 }
 640
 641 static int
 642 ahc_linux_slave_configure(struct scsi_device *sdev)
 643 {
 644         struct  ahc_softc *ahc;
 645
 646         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 647
 648         if (bootverbose)
 649                 printf("%s: Slave Configure %d\n", ahc_name(ahc), sdev->id);
 650
 651         ahc_linux_device_queue_depth(sdev);
 652
 653         /* Initial Domain Validation */
 654         if (!spi_initial_dv(sdev->sdev_target))
 655                 spi_dv_device(sdev);
 656
 657         return 0;
 658 }
 659
 660 static void
 661 ahc_linux_slave_destroy(struct scsi_device *sdev)
 662 {
 663         struct  ahc_softc *ahc;
 664         struct  ahc_linux_device *dev = scsi_transport_device_data(sdev);
 665         struct  ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 666
 667         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 668         if (bootverbose)
 669                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);
 670
 671         BUG_ON(dev->active);
 672
 673         targ->sdev[sdev->lun] = NULL;
 674 }
 675
 676 #if defined(__i386__)
 677 /*
 678  * Return the disk geometry for the given SCSI device.
 679  */
 680 static int
 681 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 682                     sector_t capacity, int geom[])
 683 {
 684         uint8_t *bh;
 685         int      heads;
 686         int      sectors;
 687         int      cylinders;
 688         int      ret;
 689         int      extended;
 690         struct   ahc_softc *ahc;
 691         u_int    channel;
 692
 693         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 694         channel = sdev->channel;
 695
 696         bh = scsi_bios_ptable(bdev);
 697         if (bh) {
 698                 ret = scsi_partsize(bh, capacity,
 699                                     &geom[2], &geom[0], &geom[1]);
 700                 kfree(bh);
 701                 if (ret != -1)
 702                         return (ret);
 703         }
 704         heads = 64;
 705         sectors = 32;
 706         cylinders = aic_sector_div(capacity, heads, sectors);
 707
 708         if (aic7xxx_extended != 0)
 709                 extended = 1;
 710         else if (channel == 0)
 711                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 712         else
 713                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 714         if (extended && cylinders >= 1024) {
 715                 heads = 255;
 716                 sectors = 63;
 717                 cylinders = aic_sector_div(capacity, heads, sectors);
 718         }
 719         geom[0] = heads;
 720         geom[1] = sectors;
 721         geom[2] = cylinders;
 722         return (0);
 723 }
 724 #endif
 725
 726 /*
 727  * Abort the current SCSI command(s).
 728  */
 729 static int
 730 ahc_linux_abort(struct scsi_cmnd *cmd)
 731 {
 732         int error;
 733
 734         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 735         if (error != 0)
 736                 printf("aic7xxx_abort returns 0x%x\n", error);
 737         return (error);
 738 }
 739
 740 /*
 741  * Attempt to send a target reset message to the device that timed out.
 742  */
 743 static int
 744 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 745 {
 746         int error;
 747
 748         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 749         if (error != 0)
 750                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 751         return (error);
 752 }
 753
 754 /*
 755  * Reset the SCSI bus.
 756  */
 757 static int
 758 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 759 {
 760         struct ahc_softc *ahc;
 761         int    found;
 762         unsigned long flags;
 763
 764         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 765
 766         ahc_lock(ahc, &flags);
 767         found = ahc_reset_channel(ahc, cmd->device->channel + 'A',
 768                                   /*initiate reset*/TRUE);
 769         ahc_unlock(ahc, &flags);
 770
 771         if (bootverbose)
 772                 printf("%s: SCSI bus reset delivered. "
 773                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 774
 775         return SUCCESS;
 776 }
 777
 778 struct scsi_host_template aic7xxx_driver_template = {
 779         .module                 = THIS_MODULE,
 780         .name                   = "aic7xxx",
 781         .proc_name              = "aic7xxx",
 782         .proc_info              = ahc_linux_proc_info,
 783         .info                   = ahc_linux_info,
 784         .queuecommand           = ahc_linux_queue,
 785         .eh_abort_handler       = ahc_linux_abort,
 786         .eh_device_reset_handler = ahc_linux_dev_reset,
 787         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 788 #if defined(__i386__)
 789         .bios_param             = ahc_linux_biosparam,
 790 #endif
 791         .can_queue              = AHC_MAX_QUEUE,
 792         .this_id                = -1,
 793         .cmd_per_lun            = 2,
 794         .use_clustering         = ENABLE_CLUSTERING,
 795         .slave_alloc            = ahc_linux_slave_alloc,
 796         .slave_configure        = ahc_linux_slave_configure,
 797         .slave_destroy          = ahc_linux_slave_destroy,
 798         .target_alloc           = ahc_linux_target_alloc,
 799         .target_destroy         = ahc_linux_target_destroy,
 800 };
 801
 802 /**************************** Tasklet Handler *********************************/
 803
 804 /******************************** Macros **************************************/
 805 #define BUILD_SCSIID(ahc, cmd)                                              \
 806         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 807         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 808         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 809
 810 /******************************** Bus DMA *************************************/
 811 int
 812 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 813                    bus_size_t alignment, bus_size_t boundary,
 814                    dma_addr_t lowaddr, dma_addr_t highaddr,
 815                    bus_dma_filter_t *filter, void *filterarg,
 816                    bus_size_t maxsize, int nsegments,
 817                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 818 {
 819         bus_dma_tag_t dmat;
 820
 821         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 822         if (dmat == NULL)
 823                 return (ENOMEM);
 824
 825         /*
 826          * Linux is very simplistic about DMA memory.  For now don't
 827          * maintain all specification information.  Once Linux supplies
 828          * better facilities for doing these operations, or the
 829          * needs of this particular driver change, we might need to do
 830          * more here.
 831          */
 832         dmat->alignment = alignment;
 833         dmat->boundary = boundary;
 834         dmat->maxsize = maxsize;
 835         *ret_tag = dmat;
 836         return (0);
 837 }
 838
 839 void
 840 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 841 {
 842         free(dmat, M_DEVBUF);
 843 }
 844
 845 int
 846 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 847                  int flags, bus_dmamap_t *mapp)
 848 {
 849         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 850                                       dmat->maxsize, mapp);
 851         if (*vaddr == NULL)
 852                 return ENOMEM;
 853         return 0;
 854 }
 855
 856 void
 857 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 858                 void* vaddr, bus_dmamap_t map)
 859 {
 860         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 861                             vaddr, map);
 862 }
 863
 864 int
 865 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 866                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 867                 void *cb_arg, int flags)
 868 {
 869         /*
 870          * Assume for now that this will only be used during
 871          * initialization and not for per-transaction buffer mapping.
 872          */
 873         bus_dma_segment_t stack_sg;
 874
 875         stack_sg.ds_addr = map;
 876         stack_sg.ds_len = dmat->maxsize;
 877         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 878         return (0);
 879 }
 880
 881 void
 882 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 883 {
 884 }
 885
 886 int
 887 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 888 {
 889         /* Nothing to do */
 890         return (0);
 891 }
 892
 893 static void
 894 ahc_linux_setup_tag_info_global(char *p)
 895 {
 896         int tags, i, j;
 897
 898         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 899         printf("Setting Global Tags= %d\n", tags);
 900
 901         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
 902                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 903                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 904                 }
 905         }
 906 }
 907
 908 static void
 909 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 910 {
 911
 912         if ((instance >= 0) && (targ >= 0)
 913          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
 914          && (targ < AHC_NUM_TARGETS)) {
 915                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 916                 if (bootverbose)
 917                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 918         }
 919 }
 920
 921 /*
 922  * Handle Linux boot parameters. This routine allows for assigning a value
 923  * to a parameter with a ':' between the parameter and the value.
 924  * ie. aic7xxx=stpwlev:1,extended
 925  */
 926 static int
 927 aic7xxx_setup(char *s)
 928 {
 929         int     i, n;
 930         char   *p;
 931         char   *end;
 932
 933         static struct {
 934                 const char *name;
 935                 uint32_t *flag;
 936         } options[] = {
 937                 { "extended", &aic7xxx_extended },
 938                 { "no_reset", &aic7xxx_no_reset },
 939                 { "verbose", &aic7xxx_verbose },
 940                 { "allow_memio", &aic7xxx_allow_memio},
 941 #ifdef AHC_DEBUG
 942                 { "debug", &ahc_debug },
 943 #endif
 944                 { "periodic_otag", &aic7xxx_periodic_otag },
 945                 { "pci_parity", &aic7xxx_pci_parity },
 946                 { "seltime", &aic7xxx_seltime },
 947                 { "tag_info", NULL },
 948                 { "global_tag_depth", NULL },
 949                 { "dv", NULL }
 950         };
 951
 952         end = strchr(s, '\0');
 953
 954         /*
 955          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
 956          * will never be 0 in this case.
 957          */
 958         n = 0;
 959
 960         while ((p = strsep(&s, ",.")) != NULL) {
 961                 if (*p == '\0')
 962                         continue;
 963                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
 964
 965                         n = strlen(options[i].name);
 966                         if (strncmp(options[i].name, p, n) == 0)
 967                                 break;
 968                 }
 969                 if (i == NUM_ELEMENTS(options))
 970                         continue;
 971
 972                 if (strncmp(p, "global_tag_depth", n) == 0) {
 973                         ahc_linux_setup_tag_info_global(p + n);
 974                 } else if (strncmp(p, "tag_info", n) == 0) {
 975                         s = aic_parse_brace_option("tag_info", p + n, end,
 976                             2, ahc_linux_setup_tag_info, 0);
 977                 } else if (p[n] == ':') {
 978                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
 979                 } else if (strncmp(p, "verbose", n) == 0) {
 980                         *(options[i].flag) = 1;
 981                 } else {
 982                         *(options[i].flag) ^= 0xFFFFFFFF;
 983                 }
 984         }
 985         return 1;
 986 }
 987
 988 __setup("aic7xxx=", aic7xxx_setup);
 989
 990 uint32_t aic7xxx_verbose;
 991
 992 int
 993 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
 994 {
 995         char     buf[80];
 996         struct   Scsi_Host *host;
 997         char    *new_name;
 998         u_long   s;
 999
1000         template->name = ahc->description;
1001         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1002         if (host == NULL)
1003                 return (ENOMEM);
1004
1005         *((struct ahc_softc **)host->hostdata) = ahc;
1006         ahc_lock(ahc, &s);
1007         scsi_assign_lock(host, &ahc->platform_data->spin_lock);
1008         ahc->platform_data->host = host;
1009         host->can_queue = AHC_MAX_QUEUE;
1010         host->cmd_per_lun = 2;
1011         /* XXX No way to communicate the ID for multiple channels */
1012         host->this_id = ahc->our_id;
1013         host->irq = ahc->platform_data->irq;
1014         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1015         host->max_lun = AHC_NUM_LUNS;
1016         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1017         host->sg_tablesize = AHC_NSEG;
1018         ahc_set_unit(ahc, ahc_linux_unit++);
1019         sprintf(buf, "scsi%d", host->host_no);
1020         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1021         if (new_name != NULL) {
1022                 strcpy(new_name, buf);
1023                 ahc_set_name(ahc, new_name);
1024         }
1025         host->unique_id = ahc->unit;
1026         ahc_linux_initialize_scsi_bus(ahc);
1027         ahc_intr_enable(ahc, TRUE);
1028         ahc_unlock(ahc, &s);
1029
1030         host->transportt = ahc_linux_transport_template;
1031
1032         scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
1033         scsi_scan_host(host);
1034         return (0);
1035 }
1036
1037 uint64_t
1038 ahc_linux_get_memsize(void)
1039 {
1040         struct sysinfo si;
1041
1042         si_meminfo(&si);
1043         return ((uint64_t)si.totalram << PAGE_SHIFT);
1044 }
1045
1046 /*
1047  * Place the SCSI bus into a known state by either resetting it,
1048  * or forcing transfer negotiations on the next command to any
1049  * target.
1050  */
1051 void
1052 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1053 {
1054         int i;
1055         int numtarg;
1056
1057         i = 0;
1058         numtarg = 0;
1059
1060         if (aic7xxx_no_reset != 0)
1061                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1062
1063         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1064                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1065         else
1066                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1067
1068         if ((ahc->features & AHC_TWIN) != 0) {
1069
1070                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1071                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1072                 } else {
1073                         if (numtarg == 0)
1074                                 i = 8;
1075                         numtarg += 8;
1076                 }
1077         }
1078
1079         /*
1080          * Force negotiation to async for all targets that
1081          * will not see an initial bus reset.
1082          */
1083         for (; i < numtarg; i++) {
1084                 struct ahc_devinfo devinfo;
1085                 struct ahc_initiator_tinfo *tinfo;
1086                 struct ahc_tmode_tstate *tstate;
1087                 u_int our_id;
1088                 u_int target_id;
1089                 char channel;
1090
1091                 channel = 'A';
1092                 our_id = ahc->our_id;
1093                 target_id = i;
1094                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1095                         channel = 'B';
1096                         our_id = ahc->our_id_b;
1097                         target_id = i % 8;
1098                 }
1099                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1100                                             target_id, &tstate);
1101                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1102                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1103                 ahc_update_neg_request(ahc, &devinfo, tstate,
1104                                        tinfo, AHC_NEG_ALWAYS);
1105         }
1106         /* Give the bus some time to recover */
1107         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1108                 ahc_linux_freeze_simq(ahc);
1109                 init_timer(&ahc->platform_data->reset_timer);
1110                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1111                 ahc->platform_data->reset_timer.expires =
1112                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1113                 ahc->platform_data->reset_timer.function =
1114                     ahc_linux_release_simq;
1115                 add_timer(&ahc->platform_data->reset_timer);
1116         }
1117 }
1118
1119 int
1120 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1121 {
1122
1123         ahc->platform_data =
1124             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1125         if (ahc->platform_data == NULL)
1126                 return (ENOMEM);
1127         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1128         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1129         ahc_lockinit(ahc);
1130         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1131         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1132         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1133         if (aic7xxx_pci_parity == 0)
1134                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1135
1136         return (0);
1137 }
1138
1139 void
1140 ahc_platform_free(struct ahc_softc *ahc)
1141 {
1142         struct scsi_target *starget;
1143         int i, j;
1144
1145         if (ahc->platform_data != NULL) {
1146                 if (ahc->platform_data->host != NULL) {
1147                         scsi_remove_host(ahc->platform_data->host);
1148                         scsi_host_put(ahc->platform_data->host);
1149                 }
1150
1151                 /* destroy all of the device and target objects */
1152                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1153                         starget = ahc->platform_data->starget[i];
1154                         if (starget != NULL) {
1155                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1156                                         struct ahc_linux_target *targ =
1157                                                 scsi_transport_target_data(starget);
1158
1159                                         if (targ->sdev[j] == NULL)
1160                                                 continue;
1161                                         targ->sdev[j] = NULL;
1162                                 }
1163                                 ahc->platform_data->starget[i] = NULL;
1164                         }
1165                 }
1166
1167                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1168                         free_irq(ahc->platform_data->irq, ahc);
1169                 if (ahc->tag == BUS_SPACE_PIO
1170                  && ahc->bsh.ioport != 0)
1171                         release_region(ahc->bsh.ioport, 256);
1172                 if (ahc->tag == BUS_SPACE_MEMIO
1173                  && ahc->bsh.maddr != NULL) {
1174                         iounmap(ahc->bsh.maddr);
1175                         release_mem_region(ahc->platform_data->mem_busaddr,
1176                                            0x1000);
1177                 }
1178
1179                 free(ahc->platform_data, M_DEVBUF);
1180         }
1181 }
1182
1183 void
1184 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1185 {
1186         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1187                                 SCB_GET_CHANNEL(ahc, scb),
1188                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1189                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1190 }
1191
1192 void
1193 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1194                       ahc_queue_alg alg)
1195 {
1196         struct scsi_target *starget;
1197         struct ahc_linux_target *targ;
1198         struct ahc_linux_device *dev;
1199         struct scsi_device *sdev;
1200         u_int target_offset;
1201         int was_queuing;
1202         int now_queuing;
1203
1204         target_offset = devinfo->target;
1205         if (devinfo->channel != 'A')
1206                 target_offset += 8;
1207         starget = ahc->platform_data->starget[target_offset];
1208         targ = scsi_transport_target_data(starget);
1209         BUG_ON(targ == NULL);
1210         sdev = targ->sdev[devinfo->lun];
1211         if (sdev == NULL)
1212                 return;
1213         dev = scsi_transport_device_data(sdev);
1214
1215         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1216         switch (alg) {
1217         default:
1218         case AHC_QUEUE_NONE:
1219                 now_queuing = 0;
1220                 break;
1221         case AHC_QUEUE_BASIC:
1222                 now_queuing = AHC_DEV_Q_BASIC;
1223                 break;
1224         case AHC_QUEUE_TAGGED:
1225                 now_queuing = AHC_DEV_Q_TAGGED;
1226                 break;
1227         }
1228         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1229          && (was_queuing != now_queuing)
1230          && (dev->active != 0)) {
1231                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1232                 dev->qfrozen++;
1233         }
1234
1235         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1236         if (now_queuing) {
1237                 u_int usertags;
1238
1239                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1240                 if (!was_queuing) {
1241                         /*
1242                          * Start out agressively and allow our
1243                          * dynamic queue depth algorithm to take
1244                          * care of the rest.
1245                          */
1246                         dev->maxtags = usertags;
1247                         dev->openings = dev->maxtags - dev->active;
1248                 }
1249                 if (dev->maxtags == 0) {
1250                         /*
1251                          * Queueing is disabled by the user.
1252                          */
1253                         dev->openings = 1;
1254                 } else if (alg == AHC_QUEUE_TAGGED) {
1255                         dev->flags |= AHC_DEV_Q_TAGGED;
1256                         if (aic7xxx_periodic_otag != 0)
1257                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1258                 } else
1259                         dev->flags |= AHC_DEV_Q_BASIC;
1260         } else {
1261                 /* We can only have one opening. */
1262                 dev->maxtags = 0;
1263                 dev->openings =  1 - dev->active;
1264         }
1265         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1266         case AHC_DEV_Q_BASIC:
1267                 scsi_adjust_queue_depth(sdev,
1268                                         MSG_SIMPLE_TASK,
1269                                         dev->openings + dev->active);
1270                 break;
1271         case AHC_DEV_Q_TAGGED:
1272                 scsi_adjust_queue_depth(sdev,
1273                                         MSG_ORDERED_TASK,
1274                                         dev->openings + dev->active);
1275                 break;
1276         default:
1277                 /*
1278                  * We allow the OS to queue 2 untagged transactions to
1279                  * us at any time even though we can only execute them
1280                  * serially on the controller/device.  This should
1281                  * remove some latency.
1282                  */
1283                 scsi_adjust_queue_depth(sdev,
1284                                         /*NON-TAGGED*/0,
1285                                         /*queue depth*/2);
1286                 break;
1287         }
1288 }
1289
1290 int
1291 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1292                         int lun, u_int tag, role_t role, uint32_t status)
1293 {
1294         return 0;
1295 }
1296
1297 static u_int
1298 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1299 {
1300         static int warned_user;
1301         u_int tags;
1302
1303         tags = 0;
1304         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1305                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1306                         if (warned_user == 0) {
1307
1308                                 printf(KERN_WARNING
1309 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1310 "aic7xxx: for installed controllers. Using defaults\n"
1311 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1312 "aic7xxx: the aic7xxx_osm..c source file.\n");
1313                                 warned_user++;
1314                         }
1315                         tags = AHC_MAX_QUEUE;
1316                 } else {
1317                         adapter_tag_info_t *tag_info;
1318
1319                         tag_info = &aic7xxx_tag_info[ahc->unit];
1320                         tags = tag_info->tag_commands[devinfo->target_offset];
1321                         if (tags > AHC_MAX_QUEUE)
1322                                 tags = AHC_MAX_QUEUE;
1323                 }
1324         }
1325         return (tags);
1326 }
1327
1328 /*
1329  * Determines the queue depth for a given device.
1330  */
1331 static void
1332 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1333 {
1334         struct  ahc_devinfo devinfo;
1335         u_int   tags;
1336         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1337
1338         ahc_compile_devinfo(&devinfo,
1339                             sdev->sdev_target->channel == 0
1340                           ? ahc->our_id : ahc->our_id_b,
1341                             sdev->sdev_target->id, sdev->lun,
1342                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1343                             ROLE_INITIATOR);
1344         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1345         if (tags != 0 && sdev->tagged_supported != 0) {
1346
1347                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1348                 ahc_print_devinfo(ahc, &devinfo);
1349                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1350         } else {
1351                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1352         }
1353 }
1354
1355 static int
1356 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1357                       struct scsi_cmnd *cmd)
1358 {
1359         struct   scb *scb;
1360         struct   hardware_scb *hscb;
1361         struct   ahc_initiator_tinfo *tinfo;
1362         struct   ahc_tmode_tstate *tstate;
1363         uint16_t mask;
1364         struct scb_tailq *untagged_q = NULL;
1365
1366         /*
1367          * Schedule us to run later.  The only reason we are not
1368          * running is because the whole controller Q is frozen.
1369          */
1370         if (ahc->platform_data->qfrozen != 0)
1371                 return SCSI_MLQUEUE_HOST_BUSY;
1372
1373         /*
1374          * We only allow one untagged transaction
1375          * per target in the initiator role unless
1376          * we are storing a full busy target *lun*
1377          * table in SCB space.
1378          */
1379         if (!blk_rq_tagged(cmd->request)
1380             && (ahc->features & AHC_SCB_BTT) == 0) {
1381                 int target_offset;
1382
1383                 target_offset = cmd->device->id + cmd->device->channel * 8;
1384                 untagged_q = &(ahc->untagged_queues[target_offset]);
1385                 if (!TAILQ_EMPTY(untagged_q))
1386                         /* if we're already executing an untagged command
1387                          * we're busy to another */
1388                         return SCSI_MLQUEUE_DEVICE_BUSY;
1389         }
1390
1391         /*
1392          * Get an scb to use.
1393          */
1394         scb = ahc_get_scb(ahc);
1395         if (!scb)
1396                 return SCSI_MLQUEUE_HOST_BUSY;
1397
1398         scb->io_ctx = cmd;
1399         scb->platform_data->dev = dev;
1400         hscb = scb->hscb;
1401         cmd->host_scribble = (char *)scb;
1402
1403         /*
1404          * Fill out basics of the HSCB.
1405          */
1406         hscb->control = 0;
1407         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1408         hscb->lun = cmd->device->lun;
1409         mask = SCB_GET_TARGET_MASK(ahc, scb);
1410         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1411                                     SCB_GET_OUR_ID(scb),
1412                                     SCB_GET_TARGET(ahc, scb), &tstate);
1413         hscb->scsirate = tinfo->scsirate;
1414         hscb->scsioffset = tinfo->curr.offset;
1415         if ((tstate->ultraenb & mask) != 0)
1416                 hscb->control |= ULTRAENB;
1417
1418         if ((ahc->user_discenable & mask) != 0)
1419                 hscb->control |= DISCENB;
1420
1421         if ((tstate->auto_negotiate & mask) != 0) {
1422                 scb->flags |= SCB_AUTO_NEGOTIATE;
1423                 scb->hscb->control |= MK_MESSAGE;
1424         }
1425
1426         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1427                 int     msg_bytes;
1428                 uint8_t tag_msgs[2];
1429
1430                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1431                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1432                         hscb->control |= tag_msgs[0];
1433                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1434                                 dev->commands_since_idle_or_otag = 0;
1435                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1436                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1437                         hscb->control |= MSG_ORDERED_TASK;
1438                         dev->commands_since_idle_or_otag = 0;
1439                 } else {
1440                         hscb->control |= MSG_SIMPLE_TASK;
1441                 }
1442         }
1443
1444         hscb->cdb_len = cmd->cmd_len;
1445         if (hscb->cdb_len <= 12) {
1446                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1447         } else {
1448                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1449                 scb->flags |= SCB_CDB32_PTR;
1450         }
1451
1452         scb->platform_data->xfer_len = 0;
1453         ahc_set_residual(scb, 0);
1454         ahc_set_sense_residual(scb, 0);
1455         scb->sg_count = 0;
1456         if (cmd->use_sg != 0) {
1457                 struct  ahc_dma_seg *sg;
1458                 struct  scatterlist *cur_seg;
1459                 struct  scatterlist *end_seg;
1460                 int     nseg;
1461
1462                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1463                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1464                                   cmd->sc_data_direction);
1465                 end_seg = cur_seg + nseg;
1466                 /* Copy the segments into the SG list. */
1467                 sg = scb->sg_list;
1468                 /*
1469                  * The sg_count may be larger than nseg if
1470                  * a transfer crosses a 32bit page.
1471                  */
1472                 while (cur_seg < end_seg) {
1473                         dma_addr_t addr;
1474                         bus_size_t len;
1475                         int consumed;
1476
1477                         addr = sg_dma_address(cur_seg);
1478                         len = sg_dma_len(cur_seg);
1479                         consumed = ahc_linux_map_seg(ahc, scb,
1480                                                      sg, addr, len);
1481                         sg += consumed;
1482                         scb->sg_count += consumed;
1483                         cur_seg++;
1484                 }
1485                 sg--;
1486                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1487
1488                 /*
1489                  * Reset the sg list pointer.
1490                  */
1491                 scb->hscb->sgptr =
1492                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1493
1494                 /*
1495                  * Copy the first SG into the "current"
1496                  * data pointer area.
1497                  */
1498                 scb->hscb->dataptr = scb->sg_list->addr;
1499                 scb->hscb->datacnt = scb->sg_list->len;
1500         } else if (cmd->request_bufflen != 0) {
1501                 struct   ahc_dma_seg *sg;
1502                 dma_addr_t addr;
1503
1504                 sg = scb->sg_list;
1505                 addr = pci_map_single(ahc->dev_softc,
1506                                       cmd->request_buffer,
1507                                       cmd->request_bufflen,
1508                                       cmd->sc_data_direction);
1509                 scb->platform_data->buf_busaddr = addr;
1510                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1511                                                   sg, addr,
1512                                                   cmd->request_bufflen);
1513                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1514
1515                 /*
1516                  * Reset the sg list pointer.
1517                  */
1518                 scb->hscb->sgptr =
1519                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1520
1521                 /*
1522                  * Copy the first SG into the "current"
1523                  * data pointer area.
1524                  */
1525                 scb->hscb->dataptr = sg->addr;
1526                 scb->hscb->datacnt = sg->len;
1527         } else {
1528                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1529                 scb->hscb->dataptr = 0;
1530                 scb->hscb->datacnt = 0;
1531                 scb->sg_count = 0;
1532         }
1533
1534         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1535         dev->openings--;
1536         dev->active++;
1537         dev->commands_issued++;
1538         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1539                 dev->commands_since_idle_or_otag++;
1540
1541         scb->flags |= SCB_ACTIVE;
1542         if (untagged_q) {
1543                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1544                 scb->flags |= SCB_UNTAGGEDQ;
1545         }
1546         ahc_queue_scb(ahc, scb);
1547         return 0;
1548 }
1549
1550 /*
1551  * SCSI controller interrupt handler.
1552  */
1553 irqreturn_t
1554 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1555 {
1556         struct  ahc_softc *ahc;
1557         u_long  flags;
1558         int     ours;
1559
1560         ahc = (struct ahc_softc *) dev_id;
1561         ahc_lock(ahc, &flags);
1562         ours = ahc_intr(ahc);
1563         ahc_unlock(ahc, &flags);
1564         return IRQ_RETVAL(ours);
1565 }
1566
1567 void
1568 ahc_platform_flushwork(struct ahc_softc *ahc)
1569 {
1570
1571 }
1572
1573 void
1574 ahc_send_async(struct ahc_softc *ahc, char channel,
1575                u_int target, u_int lun, ac_code code, void *arg)
1576 {
1577         switch (code) {
1578         case AC_TRANSFER_NEG:
1579         {
1580                 char    buf[80];
1581                 struct  scsi_target *starget;
1582                 struct  ahc_linux_target *targ;
1583                 struct  info_str info;
1584                 struct  ahc_initiator_tinfo *tinfo;
1585                 struct  ahc_tmode_tstate *tstate;
1586                 int     target_offset;
1587                 unsigned int target_ppr_options;
1588
1589                 BUG_ON(target == CAM_TARGET_WILDCARD);
1590
1591                 info.buffer = buf;
1592                 info.length = sizeof(buf);
1593                 info.offset = 0;
1594                 info.pos = 0;
1595                 tinfo = ahc_fetch_transinfo(ahc, channel,
1596                                                 channel == 'A' ? ahc->our_id
1597                                                                : ahc->our_id_b,
1598                                                 target, &tstate);
1599
1600                 /*
1601                  * Don't bother reporting results while
1602                  * negotiations are still pending.
1603                  */
1604                 if (tinfo->curr.period != tinfo->goal.period
1605                  || tinfo->curr.width != tinfo->goal.width
1606                  || tinfo->curr.offset != tinfo->goal.offset
1607                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1608                         if (bootverbose == 0)
1609                                 break;
1610
1611                 /*
1612                  * Don't bother reporting results that
1613                  * are identical to those last reported.
1614                  */
1615                 target_offset = target;
1616                 if (channel == 'B')
1617                         target_offset += 8;
1618                 starget = ahc->platform_data->starget[target_offset];
1619                 targ = scsi_transport_target_data(starget);
1620                 if (targ == NULL)
1621                         break;
1622
1623                 target_ppr_options =
1624                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1625                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1626                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1627
1628                 if (tinfo->curr.period == spi_period(starget)
1629                     && tinfo->curr.width == spi_width(starget)
1630                     && tinfo->curr.offset == spi_offset(starget)
1631                  && tinfo->curr.ppr_options == target_ppr_options)
1632                         if (bootverbose == 0)
1633                                 break;
1634
1635                 spi_period(starget) = tinfo->curr.period;
1636                 spi_width(starget) = tinfo->curr.width;
1637                 spi_offset(starget) = tinfo->curr.offset;
1638                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ;
1639                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ;
1640                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ;
1641                 spi_display_xfer_agreement(starget);
1642                 break;
1643         }
1644         case AC_SENT_BDR:
1645         {
1646                 WARN_ON(lun != CAM_LUN_WILDCARD);
1647                 scsi_report_device_reset(ahc->platform_data->host,
1648                                          channel - 'A', target);
1649                 break;
1650         }
1651         case AC_BUS_RESET:
1652                 if (ahc->platform_data->host != NULL) {
1653                         scsi_report_bus_reset(ahc->platform_data->host,
1654                                               channel - 'A');
1655                 }
1656                 break;
1657         default:
1658                 panic("ahc_send_async: Unexpected async event");
1659         }
1660 }
1661
1662 /*
1663  * Calls the higher level scsi done function and frees the scb.
1664  */
1665 void
1666 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1667 {
1668         struct scsi_cmnd *cmd;
1669         struct     ahc_linux_device *dev;
1670
1671         LIST_REMOVE(scb, pending_links);
1672         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1673                 struct scb_tailq *untagged_q;
1674                 int target_offset;
1675
1676                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1677                 untagged_q = &(ahc->untagged_queues[target_offset]);
1678                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1679                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1680         }
1681
1682         if ((scb->flags & SCB_ACTIVE) == 0) {
1683                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1684                 ahc_dump_card_state(ahc);
1685                 panic("Stopping for safety");
1686         }
1687         cmd = scb->io_ctx;
1688         dev = scb->platform_data->dev;
1689         dev->active--;
1690         dev->openings++;
1691         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1692                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1693                 dev->qfrozen--;
1694         }
1695         ahc_linux_unmap_scb(ahc, scb);
1696
1697         /*
1698          * Guard against stale sense data.
1699          * The Linux mid-layer assumes that sense
1700          * was retrieved anytime the first byte of
1701          * the sense buffer looks "sane".
1702          */
1703         cmd->sense_buffer[0] = 0;
1704         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1705                 uint32_t amount_xferred;
1706
1707                 amount_xferred =
1708                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1709                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1710 #ifdef AHC_DEBUG
1711                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1712                                 ahc_print_path(ahc, scb);
1713                                 printf("Set CAM_UNCOR_PARITY\n");
1714                         }
1715 #endif
1716                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1717 #ifdef AHC_REPORT_UNDERFLOWS
1718                 /*
1719                  * This code is disabled by default as some
1720                  * clients of the SCSI system do not properly
1721                  * initialize the underflow parameter.  This
1722                  * results in spurious termination of commands
1723                  * that complete as expected (e.g. underflow is
1724                  * allowed as command can return variable amounts
1725                  * of data.
1726                  */
1727                 } else if (amount_xferred < scb->io_ctx->underflow) {
1728                         u_int i;
1729
1730                         ahc_print_path(ahc, scb);
1731                         printf("CDB:");
1732                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1733                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1734                         printf("\n");
1735                         ahc_print_path(ahc, scb);
1736                         printf("Saw underflow (%ld of %ld bytes). "
1737                                "Treated as error\n",
1738                                 ahc_get_residual(scb),
1739                                 ahc_get_transfer_length(scb));
1740                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1741 #endif
1742                 } else {
1743                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1744                 }
1745         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1746                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1747         }
1748
1749         if (dev->openings == 1
1750          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1751          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1752                 dev->tag_success_count++;
1753         /*
1754          * Some devices deal with temporary internal resource
1755          * shortages by returning queue full.  When the queue
1756          * full occurrs, we throttle back.  Slowly try to get
1757          * back to our previous queue depth.
1758          */
1759         if ((dev->openings + dev->active) < dev->maxtags
1760          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1761                 dev->tag_success_count = 0;
1762                 dev->openings++;
1763         }
1764
1765         if (dev->active == 0)
1766                 dev->commands_since_idle_or_otag = 0;
1767
1768         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1769                 printf("Recovery SCB completes\n");
1770                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1771                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1772                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1773                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
1774                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
1775                         up(&ahc->platform_data->eh_sem);
1776                 }
1777         }
1778
1779         ahc_free_scb(ahc, scb);
1780         ahc_linux_queue_cmd_complete(ahc, cmd);
1781 }
1782
1783 static void
1784 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1785                              struct scsi_device *sdev, struct scb *scb)
1786 {
1787         struct  ahc_devinfo devinfo;
1788         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1789
1790         ahc_compile_devinfo(&devinfo,
1791                             ahc->our_id,
1792                             sdev->sdev_target->id, sdev->lun,
1793                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1794                             ROLE_INITIATOR);
1795
1796         /*
1797          * We don't currently trust the mid-layer to
1798          * properly deal with queue full or busy.  So,
1799          * when one occurs, we tell the mid-layer to
1800          * unconditionally requeue the command to us
1801          * so that we can retry it ourselves.  We also
1802          * implement our own throttling mechanism so
1803          * we don't clobber the device with too many
1804          * commands.
1805          */
1806         switch (ahc_get_scsi_status(scb)) {
1807         default:
1808                 break;
1809         case SCSI_STATUS_CHECK_COND:
1810         case SCSI_STATUS_CMD_TERMINATED:
1811         {
1812                 struct scsi_cmnd *cmd;
1813
1814                 /*
1815                  * Copy sense information to the OS's cmd
1816                  * structure if it is available.
1817                  */
1818                 cmd = scb->io_ctx;
1819                 if (scb->flags & SCB_SENSE) {
1820                         u_int sense_size;
1821
1822                         sense_size = MIN(sizeof(struct scsi_sense_data)
1823                                        - ahc_get_sense_residual(scb),
1824                                          sizeof(cmd->sense_buffer));
1825                         memcpy(cmd->sense_buffer,
1826                                ahc_get_sense_buf(ahc, scb), sense_size);
1827                         if (sense_size < sizeof(cmd->sense_buffer))
1828                                 memset(&cmd->sense_buffer[sense_size], 0,
1829                                        sizeof(cmd->sense_buffer) - sense_size);
1830                         cmd->result |= (DRIVER_SENSE << 24);
1831 #ifdef AHC_DEBUG
1832                         if (ahc_debug & AHC_SHOW_SENSE) {
1833                                 int i;
1834
1835                                 printf("Copied %d bytes of sense data:",
1836                                        sense_size);
1837                                 for (i = 0; i < sense_size; i++) {
1838                                         if ((i & 0xF) == 0)
1839                                                 printf("\n");
1840                                         printf("0x%x ", cmd->sense_buffer[i]);
1841                                 }
1842                                 printf("\n");
1843                         }
1844 #endif
1845                 }
1846                 break;
1847         }
1848         case SCSI_STATUS_QUEUE_FULL:
1849         {
1850                 /*
1851                  * By the time the core driver has returned this
1852                  * command, all other commands that were queued
1853                  * to us but not the device have been returned.
1854                  * This ensures that dev->active is equal to
1855                  * the number of commands actually queued to
1856                  * the device.
1857                  */
1858                 dev->tag_success_count = 0;
1859                 if (dev->active != 0) {
1860                         /*
1861                          * Drop our opening count to the number
1862                          * of commands currently outstanding.
1863                          */
1864                         dev->openings = 0;
1865 /*
1866                         ahc_print_path(ahc, scb);
1867                         printf("Dropping tag count to %d\n", dev->active);
1868  */
1869                         if (dev->active == dev->tags_on_last_queuefull) {
1870
1871                                 dev->last_queuefull_same_count++;
1872                                 /*
1873                                  * If we repeatedly see a queue full
1874                                  * at the same queue depth, this
1875                                  * device has a fixed number of tag
1876                                  * slots.  Lock in this tag depth
1877                                  * so we stop seeing queue fulls from
1878                                  * this device.
1879                                  */
1880                                 if (dev->last_queuefull_same_count
1881                                  == AHC_LOCK_TAGS_COUNT) {
1882                                         dev->maxtags = dev->active;
1883                                         ahc_print_path(ahc, scb);
1884                                         printf("Locking max tag count at %d\n",
1885                                                dev->active);
1886                                 }
1887                         } else {
1888                                 dev->tags_on_last_queuefull = dev->active;
1889                                 dev->last_queuefull_same_count = 0;
1890                         }
1891                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1892                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1893                         ahc_platform_set_tags(ahc, &devinfo,
1894                                      (dev->flags & AHC_DEV_Q_BASIC)
1895                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1896                         break;
1897                 }
1898                 /*
1899                  * Drop down to a single opening, and treat this
1900                  * as if the target returned BUSY SCSI status.
1901                  */
1902                 dev->openings = 1;
1903                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1904                 ahc_platform_set_tags(ahc, &devinfo,
1905                              (dev->flags & AHC_DEV_Q_BASIC)
1906                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1907                 break;
1908         }
1909         }
1910 }
1911
1912 static void
1913 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1914 {
1915         /*
1916          * Map CAM error codes into Linux Error codes.  We
1917          * avoid the conversion so that the DV code has the
1918          * full error information available when making
1919          * state change decisions.
1920          */
1921         {
1922                 u_int new_status;
1923
1924                 switch (ahc_cmd_get_transaction_status(cmd)) {
1925                 case CAM_REQ_INPROG:
1926                 case CAM_REQ_CMP:
1927                 case CAM_SCSI_STATUS_ERROR:
1928                         new_status = DID_OK;
1929                         break;
1930                 case CAM_REQ_ABORTED:
1931                         new_status = DID_ABORT;
1932                         break;
1933                 case CAM_BUSY:
1934                         new_status = DID_BUS_BUSY;
1935                         break;
1936                 case CAM_REQ_INVALID:
1937                 case CAM_PATH_INVALID:
1938                         new_status = DID_BAD_TARGET;
1939                         break;
1940                 case CAM_SEL_TIMEOUT:
1941                         new_status = DID_NO_CONNECT;
1942                         break;
1943                 case CAM_SCSI_BUS_RESET:
1944                 case CAM_BDR_SENT:
1945                         new_status = DID_RESET;
1946                         break;
1947                 case CAM_UNCOR_PARITY:
1948                         new_status = DID_PARITY;
1949                         break;
1950                 case CAM_CMD_TIMEOUT:
1951                         new_status = DID_TIME_OUT;
1952                         break;
1953                 case CAM_UA_ABORT:
1954                 case CAM_REQ_CMP_ERR:
1955                 case CAM_AUTOSENSE_FAIL:
1956                 case CAM_NO_HBA:
1957                 case CAM_DATA_RUN_ERR:
1958                 case CAM_UNEXP_BUSFREE:
1959                 case CAM_SEQUENCE_FAIL:
1960                 case CAM_CCB_LEN_ERR:
1961                 case CAM_PROVIDE_FAIL:
1962                 case CAM_REQ_TERMIO:
1963                 case CAM_UNREC_HBA_ERROR:
1964                 case CAM_REQ_TOO_BIG:
1965                         new_status = DID_ERROR;
1966                         break;
1967                 case CAM_REQUEUE_REQ:
1968                         new_status = DID_REQUEUE;
1969                         break;
1970                 default:
1971                         /* We should never get here */
1972                         new_status = DID_ERROR;
1973                         break;
1974                 }
1975
1976                 ahc_cmd_set_transaction_status(cmd, new_status);
1977         }
1978
1979         cmd->scsi_done(cmd);
1980 }
1981
1982 static void
1983 ahc_linux_sem_timeout(u_long arg)
1984 {
1985         struct  ahc_softc *ahc;
1986         u_long  s;
1987
1988         ahc = (struct ahc_softc *)arg;
1989
1990         ahc_lock(ahc, &s);
1991         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
1992                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
1993                 up(&ahc->platform_data->eh_sem);
1994         }
1995         ahc_unlock(ahc, &s);
1996 }
1997
1998 static void
1999 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2000 {
2001         ahc->platform_data->qfrozen++;
2002         if (ahc->platform_data->qfrozen == 1) {
2003                 scsi_block_requests(ahc->platform_data->host);
2004
2005                 /* XXX What about Twin channels? */
2006                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2007                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2008                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2009         }
2010 }
2011
2012 static void
2013 ahc_linux_release_simq(u_long arg)
2014 {
2015         struct ahc_softc *ahc;
2016         u_long s;
2017         int    unblock_reqs;
2018
2019         ahc = (struct ahc_softc *)arg;
2020
2021         unblock_reqs = 0;
2022         ahc_lock(ahc, &s);
2023         if (ahc->platform_data->qfrozen > 0)
2024                 ahc->platform_data->qfrozen--;
2025         if (ahc->platform_data->qfrozen == 0)
2026                 unblock_reqs = 1;
2027         ahc_unlock(ahc, &s);
2028         /*
2029          * There is still a race here.  The mid-layer
2030          * should keep its own freeze count and use
2031          * a bottom half handler to run the queues
2032          * so we can unblock with our own lock held.
2033          */
2034         if (unblock_reqs)
2035                 scsi_unblock_requests(ahc->platform_data->host);
2036 }
2037
2038 static int
2039 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2040 {
2041         struct ahc_softc *ahc;
2042         struct ahc_linux_device *dev;
2043         struct scb *pending_scb;
2044         u_int  saved_scbptr;
2045         u_int  active_scb_index;
2046         u_int  last_phase;
2047         u_int  saved_scsiid;
2048         u_int  cdb_byte;
2049         int    retval;
2050         int    was_paused;
2051         int    paused;
2052         int    wait;
2053         int    disconnected;
2054
2055         pending_scb = NULL;
2056         paused = FALSE;
2057         wait = FALSE;
2058         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2059
2060         printf("%s:%d:%d:%d: Attempting to queue a%s message\n",
2061                ahc_name(ahc), cmd->device->channel,
2062                cmd->device->id, cmd->device->lun,
2063                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2064
2065         printf("CDB:");
2066         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2067                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2068         printf("\n");
2069
2070         spin_lock_irq(&ahc->platform_data->spin_lock);
2071
2072         /*
2073          * First determine if we currently own this command.
2074          * Start by searching the device queue.  If not found
2075          * there, check the pending_scb list.  If not found
2076          * at all, and the system wanted us to just abort the
2077          * command, return success.
2078          */
2079         dev = scsi_transport_device_data(cmd->device);
2080
2081         if (dev == NULL) {
2082                 /*
2083                  * No target device for this command exists,
2084                  * so we must not still own the command.
2085                  */
2086                 printf("%s:%d:%d:%d: Is not an active device\n",
2087                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2088                        cmd->device->lun);
2089                 retval = SUCCESS;
2090                 goto no_cmd;
2091         }
2092
2093         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2094          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2095                                        cmd->device->channel + 'A',
2096                                        cmd->device->lun,
2097                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2098                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2099                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2100                        cmd->device->lun);
2101                 retval = SUCCESS;
2102                 goto done;
2103         }
2104
2105         /*
2106          * See if we can find a matching cmd in the pending list.
2107          */
2108         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2109                 if (pending_scb->io_ctx == cmd)
2110                         break;
2111         }
2112
2113         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2114
2115                 /* Any SCB for this device will do for a target reset */
2116                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2117                         if (ahc_match_scb(ahc, pending_scb, cmd->device->id,
2118                                           cmd->device->channel + 'A',
2119                                           CAM_LUN_WILDCARD,
2120                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2121                                 break;
2122                 }
2123         }
2124
2125         if (pending_scb == NULL) {
2126                 printf("%s:%d:%d:%d: Command not found\n",
2127                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2128                        cmd->device->lun);
2129                 goto no_cmd;
2130         }
2131
2132         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2133                 /*
2134                  * We can't queue two recovery actions using the same SCB
2135                  */
2136                 retval = FAILED;
2137                 goto  done;
2138         }
2139
2140         /*
2141          * Ensure that the card doesn't do anything
2142          * behind our back and that we didn't "just" miss
2143          * an interrupt that would affect this cmd.
2144          */
2145         was_paused = ahc_is_paused(ahc);
2146         ahc_pause_and_flushwork(ahc);
2147         paused = TRUE;
2148
2149         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2150                 printf("%s:%d:%d:%d: Command already completed\n",
2151                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2152                        cmd->device->lun);
2153                 goto no_cmd;
2154         }
2155
2156         printf("%s: At time of recovery, card was %spaused\n",
2157                ahc_name(ahc), was_paused ? "" : "not ");
2158         ahc_dump_card_state(ahc);
2159
2160         disconnected = TRUE;
2161         if (flag == SCB_ABORT) {
2162                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2163                                        cmd->device->channel + 'A',
2164                                        cmd->device->lun,
2165                                        pending_scb->hscb->tag,
2166                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2167                                        SEARCH_COMPLETE) > 0) {
2168                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2169                                ahc_name(ahc), cmd->device->channel,
2170                                         cmd->device->id, cmd->device->lun);
2171                         retval = SUCCESS;
2172                         goto done;
2173                 }
2174         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2175                                       cmd->device->channel + 'A',
2176                                       cmd->device->lun, pending_scb->hscb->tag,
2177                                       ROLE_INITIATOR, /*status*/0,
2178                                       SEARCH_COUNT) > 0) {
2179                 disconnected = FALSE;
2180         }
2181
2182         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2183                 struct scb *bus_scb;
2184
2185                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2186                 if (bus_scb == pending_scb)
2187                         disconnected = FALSE;
2188                 else if (flag != SCB_ABORT
2189                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2190                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2191                         disconnected = FALSE;
2192         }
2193
2194         /*
2195          * At this point, pending_scb is the scb associated with the
2196          * passed in command.  That command is currently active on the
2197          * bus, is in the disconnected state, or we're hoping to find
2198          * a command for the same target active on the bus to abuse to
2199          * send a BDR.  Queue the appropriate message based on which of
2200          * these states we are in.
2201          */
2202         last_phase = ahc_inb(ahc, LASTPHASE);
2203         saved_scbptr = ahc_inb(ahc, SCBPTR);
2204         active_scb_index = ahc_inb(ahc, SCB_TAG);
2205         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2206         if (last_phase != P_BUSFREE
2207          && (pending_scb->hscb->tag == active_scb_index
2208           || (flag == SCB_DEVICE_RESET
2209            && SCSIID_TARGET(ahc, saved_scsiid) == cmd->device->id))) {
2210
2211                 /*
2212                  * We're active on the bus, so assert ATN
2213                  * and hope that the target responds.
2214                  */
2215                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2216                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2217                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2218                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2219                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
2220                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2221                        cmd->device->lun);
2222                 wait = TRUE;
2223         } else if (disconnected) {
2224
2225                 /*
2226                  * Actually re-queue this SCB in an attempt
2227                  * to select the device before it reconnects.
2228                  * In either case (selection or reselection),
2229                  * we will now issue the approprate message
2230                  * to the timed-out device.
2231                  *
2232                  * Set the MK_MESSAGE control bit indicating
2233                  * that we desire to send a message.  We
2234                  * also set the disconnected flag since
2235                  * in the paging case there is no guarantee
2236                  * that our SCB control byte matches the
2237                  * version on the card.  We don't want the
2238                  * sequencer to abort the command thinking
2239                  * an unsolicited reselection occurred.
2240                  */
2241                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2242                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2243
2244                 /*
2245                  * Remove any cached copy of this SCB in the
2246                  * disconnected list in preparation for the
2247                  * queuing of our abort SCB.  We use the
2248                  * same element in the SCB, SCB_NEXT, for
2249                  * both the qinfifo and the disconnected list.
2250                  */
2251                 ahc_search_disc_list(ahc, cmd->device->id,
2252                                      cmd->device->channel + 'A',
2253                                      cmd->device->lun, pending_scb->hscb->tag,
2254                                      /*stop_on_first*/TRUE,
2255                                      /*remove*/TRUE,
2256                                      /*save_state*/FALSE);
2257
2258                 /*
2259                  * In the non-paging case, the sequencer will
2260                  * never re-reference the in-core SCB.
2261                  * To make sure we are notified during
2262                  * reslection, set the MK_MESSAGE flag in
2263                  * the card's copy of the SCB.
2264                  */
2265                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2266                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2267                         ahc_outb(ahc, SCB_CONTROL,
2268                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2269                 }
2270
2271                 /*
2272                  * Clear out any entries in the QINFIFO first
2273                  * so we are the next SCB for this target
2274                  * to run.
2275                  */
2276                 ahc_search_qinfifo(ahc, cmd->device->id,
2277                                    cmd->device->channel + 'A',
2278                                    cmd->device->lun, SCB_LIST_NULL,
2279                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2280                                    SEARCH_COMPLETE);
2281                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2282                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2283                 ahc_print_path(ahc, pending_scb);
2284                 printf("Device is disconnected, re-queuing SCB\n");
2285                 wait = TRUE;
2286         } else {
2287                 printf("%s:%d:%d:%d: Unable to deliver message\n",
2288                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2289                        cmd->device->lun);
2290                 retval = FAILED;
2291                 goto done;
2292         }
2293
2294 no_cmd:
2295         /*
2296          * Our assumption is that if we don't have the command, no
2297          * recovery action was required, so we return success.  Again,
2298          * the semantics of the mid-layer recovery engine are not
2299          * well defined, so this may change in time.
2300          */
2301         retval = SUCCESS;
2302 done:
2303         if (paused)
2304                 ahc_unpause(ahc);
2305         if (wait) {
2306                 struct timer_list timer;
2307                 int ret;
2308
2309                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2310                 spin_unlock_irq(&ahc->platform_data->spin_lock);
2311                 init_timer(&timer);
2312                 timer.data = (u_long)ahc;
2313                 timer.expires = jiffies + (5 * HZ);
2314                 timer.function = ahc_linux_sem_timeout;
2315                 add_timer(&timer);
2316                 printf("Recovery code sleeping\n");
2317                 down(&ahc->platform_data->eh_sem);
2318                 printf("Recovery code awake\n");
2319                 ret = del_timer_sync(&timer);
2320                 if (ret == 0) {
2321                         printf("Timer Expired\n");
2322                         retval = FAILED;
2323                 }
2324                 spin_lock_irq(&ahc->platform_data->spin_lock);
2325         }
2326
2327         spin_unlock_irq(&ahc->platform_data->spin_lock);
2328         return (retval);
2329 }
2330
2331 void
2332 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2333 {
2334 }
2335
2336 static void ahc_linux_exit(void);
2337
2338 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2339 {
2340         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2341         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2342         struct ahc_devinfo devinfo;
2343         unsigned long flags;
2344
2345         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2346                             starget->channel + 'A', ROLE_INITIATOR);
2347         ahc_lock(ahc, &flags);
2348         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2349         ahc_unlock(ahc, &flags);
2350 }
2351
2352 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2353 {
2354         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2355         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2356         struct ahc_tmode_tstate *tstate;
2357         struct ahc_initiator_tinfo *tinfo
2358                 = ahc_fetch_transinfo(ahc,
2359                                       starget->channel + 'A',
2360                                       shost->this_id, starget->id, &tstate);
2361         struct ahc_devinfo devinfo;
2362         unsigned int ppr_options = tinfo->goal.ppr_options;
2363         unsigned long flags;
2364         unsigned long offset = tinfo->goal.offset;
2365         struct ahc_syncrate *syncrate;
2366
2367         if (offset == 0)
2368                 offset = MAX_OFFSET;
2369
2370         if (period < 9)
2371                 period = 9;     /* 12.5ns is our minimum */
2372         if (period == 9)
2373                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2374
2375         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2376                             starget->channel + 'A', ROLE_INITIATOR);
2377
2378         /* all PPR requests apart from QAS require wide transfers */
2379         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2380                 if (spi_width(starget) == 0)
2381                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2382         }
2383
2384         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2385         ahc_lock(ahc, &flags);
2386         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2387                          ppr_options, AHC_TRANS_GOAL, FALSE);
2388         ahc_unlock(ahc, &flags);
2389 }
2390
2391 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2392 {
2393         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2394         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2395         struct ahc_tmode_tstate *tstate;
2396         struct ahc_initiator_tinfo *tinfo
2397                 = ahc_fetch_transinfo(ahc,
2398                                       starget->channel + 'A',
2399                                       shost->this_id, starget->id, &tstate);
2400         struct ahc_devinfo devinfo;
2401         unsigned int ppr_options = 0;
2402         unsigned int period = 0;
2403         unsigned long flags;
2404         struct ahc_syncrate *syncrate = NULL;
2405
2406         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2407                             starget->channel + 'A', ROLE_INITIATOR);
2408         if (offset != 0) {
2409                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2410                 period = tinfo->goal.period;
2411                 ppr_options = tinfo->goal.ppr_options;
2412         }
2413         ahc_lock(ahc, &flags);
2414         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2415                          ppr_options, AHC_TRANS_GOAL, FALSE);
2416         ahc_unlock(ahc, &flags);
2417 }
2418
2419 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2420 {
2421         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2422         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2423         struct ahc_tmode_tstate *tstate;
2424         struct ahc_initiator_tinfo *tinfo
2425                 = ahc_fetch_transinfo(ahc,
2426                                       starget->channel + 'A',
2427                                       shost->this_id, starget->id, &tstate);
2428         struct ahc_devinfo devinfo;
2429         unsigned int ppr_options = tinfo->goal.ppr_options
2430                 & ~MSG_EXT_PPR_DT_REQ;
2431         unsigned int period = tinfo->goal.period;
2432         unsigned long flags;
2433         struct ahc_syncrate *syncrate;
2434
2435         if (dt) {
2436                 period = 9;     /* 12.5ns is the only period valid for DT */
2437                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2438         } else if (period == 9)
2439                 period = 10;    /* if resetting DT, period must be >= 25ns */
2440
2441         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2442                             starget->channel + 'A', ROLE_INITIATOR);
2443         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2444         ahc_lock(ahc, &flags);
2445         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2446                          ppr_options, AHC_TRANS_GOAL, FALSE);
2447         ahc_unlock(ahc, &flags);
2448 }
2449
2450 #if 0
2451 /* FIXME: This code claims to support IU and QAS.  However, the actual
2452  * sequencer code and aic7xxx_core have no support for these parameters and
2453  * will get into a bad state if they're negotiated.  Do not enable this
2454  * unless you know what you're doing */
2455 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2456 {
2457         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2458         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2459         struct ahc_tmode_tstate *tstate;
2460         struct ahc_initiator_tinfo *tinfo
2461                 = ahc_fetch_transinfo(ahc,
2462                                       starget->channel + 'A',
2463                                       shost->this_id, starget->id, &tstate);
2464         struct ahc_devinfo devinfo;
2465         unsigned int ppr_options = tinfo->goal.ppr_options
2466                 & ~MSG_EXT_PPR_QAS_REQ;
2467         unsigned int period = tinfo->goal.period;
2468         unsigned long flags;
2469         struct ahc_syncrate *syncrate;
2470
2471         if (qas)
2472                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2473
2474         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2475                             starget->channel + 'A', ROLE_INITIATOR);
2476         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2477         ahc_lock(ahc, &flags);
2478         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2479                          ppr_options, AHC_TRANS_GOAL, FALSE);
2480         ahc_unlock(ahc, &flags);
2481 }
2482
2483 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2484 {
2485         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2486         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2487         struct ahc_tmode_tstate *tstate;
2488         struct ahc_initiator_tinfo *tinfo
2489                 = ahc_fetch_transinfo(ahc,
2490                                       starget->channel + 'A',
2491                                       shost->this_id, starget->id, &tstate);
2492         struct ahc_devinfo devinfo;
2493         unsigned int ppr_options = tinfo->goal.ppr_options
2494                 & ~MSG_EXT_PPR_IU_REQ;
2495         unsigned int period = tinfo->goal.period;
2496         unsigned long flags;
2497         struct ahc_syncrate *syncrate;
2498
2499         if (iu)
2500                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2501
2502         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2503                             starget->channel + 'A', ROLE_INITIATOR);
2504         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2505         ahc_lock(ahc, &flags);
2506         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2507                          ppr_options, AHC_TRANS_GOAL, FALSE);
2508         ahc_unlock(ahc, &flags);
2509 }
2510 #endif
2511
2512 static struct spi_function_template ahc_linux_transport_functions = {
2513         .set_offset     = ahc_linux_set_offset,
2514         .show_offset    = 1,
2515         .set_period     = ahc_linux_set_period,
2516         .show_period    = 1,
2517         .set_width      = ahc_linux_set_width,
2518         .show_width     = 1,
2519         .set_dt         = ahc_linux_set_dt,
2520         .show_dt        = 1,
2521 #if 0
2522         .set_iu         = ahc_linux_set_iu,
2523         .show_iu        = 1,
2524         .set_qas        = ahc_linux_set_qas,
2525         .show_qas       = 1,
2526 #endif
2527 };
2528
2529
2530
2531 static int __init
2532 ahc_linux_init(void)
2533 {
2534         /*
2535          * If we've been passed any parameters, process them now.
2536          */
2537         if (aic7xxx)
2538                 aic7xxx_setup(aic7xxx);
2539
2540         ahc_linux_transport_template =
2541                 spi_attach_transport(&ahc_linux_transport_functions);
2542         if (!ahc_linux_transport_template)
2543                 return -ENODEV;
2544
2545         scsi_transport_reserve_target(ahc_linux_transport_template,
2546                                       sizeof(struct ahc_linux_target));
2547         scsi_transport_reserve_device(ahc_linux_transport_template,
2548                                       sizeof(struct ahc_linux_device));
2549
2550         ahc_linux_pci_init();
2551         ahc_linux_eisa_init();
2552         return 0;
2553 }
2554
2555 static void
2556 ahc_linux_exit(void)
2557 {
2558         ahc_linux_pci_exit();
2559         ahc_linux_eisa_exit();
2560         spi_release_transport(ahc_linux_transport_template);
2561 }
2562
2563 module_init(ahc_linux_init);
2564 module_exit(ahc_linux_exit);