git.oblomov.eu Git - linux-2.6/blob - drivers/firewire/fw-sbp2.c

   1 /*
   2  * SBP2 driver (SCSI over IEEE1394)
   3  *
   4  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22  * The basic structure of this driver is based on the old storage driver,
  23  * drivers/ieee1394/sbp2.c, originally written by
  24  *     James Goodwin <jamesg@filanet.com>
  25  * with later contributions and ongoing maintenance from
  26  *     Ben Collins <bcollins@debian.org>,
  27  *     Stefan Richter <stefanr@s5r6.in-berlin.de>
  28  * and many others.
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/mod_devicetable.h>
  35 #include <linux/device.h>
  36 #include <linux/scatterlist.h>
  37 #include <linux/dma-mapping.h>
  38 #include <linux/blkdev.h>
  39 #include <linux/string.h>
  40 #include <linux/timer.h>
  41
  42 #include <scsi/scsi.h>
  43 #include <scsi/scsi_cmnd.h>
  44 #include <scsi/scsi_dbg.h>
  45 #include <scsi/scsi_device.h>
  46 #include <scsi/scsi_host.h>
  47
  48 #include "fw-transaction.h"
  49 #include "fw-topology.h"
  50 #include "fw-device.h"
  51
  52 /*
  53  * So far only bridges from Oxford Semiconductor are known to support
  54  * concurrent logins. Depending on firmware, four or two concurrent logins
  55  * are possible on OXFW911 and newer Oxsemi bridges.
  56  *
  57  * Concurrent logins are useful together with cluster filesystems.
  58  */
  59 static int sbp2_param_exclusive_login = 1;
  60 module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
  61 MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
  62                  "(default = Y, use N for concurrent initiators)");
  63
  64 /* I don't know why the SCSI stack doesn't define something like this... */
  65 typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
  66
  67 static const char sbp2_driver_name[] = "sbp2";
  68
  69 struct sbp2_device {
  70         struct kref kref;
  71         struct fw_unit *unit;
  72         struct fw_address_handler address_handler;
  73         struct list_head orb_list;
  74         u64 management_agent_address;
  75         u64 command_block_agent_address;
  76         u32 workarounds;
  77         int login_id;
  78
  79         /*
  80          * We cache these addresses and only update them once we've
  81          * logged in or reconnected to the sbp2 device.  That way, any
  82          * IO to the device will automatically fail and get retried if
  83          * it happens in a window where the device is not ready to
  84          * handle it (e.g. after a bus reset but before we reconnect).
  85          */
  86         int node_id;
  87         int address_high;
  88         int generation;
  89
  90         int retries;
  91         struct delayed_work work;
  92 };
  93
  94 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
  95 #define SBP2_MAX_SECTORS                255     /* Max sectors supported */
  96 #define SBP2_ORB_TIMEOUT                2000    /* Timeout in ms */
  97
  98 #define SBP2_ORB_NULL                   0x80000000
  99
 100 #define SBP2_DIRECTION_TO_MEDIA         0x0
 101 #define SBP2_DIRECTION_FROM_MEDIA       0x1
 102
 103 /* Unit directory keys */
 104 #define SBP2_COMMAND_SET_SPECIFIER      0x38
 105 #define SBP2_COMMAND_SET                0x39
 106 #define SBP2_COMMAND_SET_REVISION       0x3b
 107 #define SBP2_FIRMWARE_REVISION          0x3c
 108
 109 /* Flags for detected oddities and brokeness */
 110 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
 111 #define SBP2_WORKAROUND_INQUIRY_36      0x2
 112 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
 113 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
 114 #define SBP2_WORKAROUND_OVERRIDE        0x100
 115
 116 /* Management orb opcodes */
 117 #define SBP2_LOGIN_REQUEST              0x0
 118 #define SBP2_QUERY_LOGINS_REQUEST       0x1
 119 #define SBP2_RECONNECT_REQUEST          0x3
 120 #define SBP2_SET_PASSWORD_REQUEST       0x4
 121 #define SBP2_LOGOUT_REQUEST             0x7
 122 #define SBP2_ABORT_TASK_REQUEST         0xb
 123 #define SBP2_ABORT_TASK_SET             0xc
 124 #define SBP2_LOGICAL_UNIT_RESET         0xe
 125 #define SBP2_TARGET_RESET_REQUEST       0xf
 126
 127 /* Offsets for command block agent registers */
 128 #define SBP2_AGENT_STATE                0x00
 129 #define SBP2_AGENT_RESET                0x04
 130 #define SBP2_ORB_POINTER                0x08
 131 #define SBP2_DOORBELL                   0x10
 132 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 133
 134 /* Status write response codes */
 135 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 136 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 137 #define SBP2_STATUS_ILLEGAL_REQUEST     0x2
 138 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 139
 140 #define STATUS_GET_ORB_HIGH(v)          ((v).status & 0xffff)
 141 #define STATUS_GET_SBP_STATUS(v)        (((v).status >> 16) & 0xff)
 142 #define STATUS_GET_LEN(v)               (((v).status >> 24) & 0x07)
 143 #define STATUS_GET_DEAD(v)              (((v).status >> 27) & 0x01)
 144 #define STATUS_GET_RESPONSE(v)          (((v).status >> 28) & 0x03)
 145 #define STATUS_GET_SOURCE(v)            (((v).status >> 30) & 0x03)
 146 #define STATUS_GET_ORB_LOW(v)           ((v).orb_low)
 147 #define STATUS_GET_DATA(v)              ((v).data)
 148
 149 struct sbp2_status {
 150         u32 status;
 151         u32 orb_low;
 152         u8 data[24];
 153 };
 154
 155 struct sbp2_pointer {
 156         u32 high;
 157         u32 low;
 158 };
 159
 160 struct sbp2_orb {
 161         struct fw_transaction t;
 162         struct kref kref;
 163         dma_addr_t request_bus;
 164         int rcode;
 165         struct sbp2_pointer pointer;
 166         void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
 167         struct list_head link;
 168 };
 169
 170 #define MANAGEMENT_ORB_LUN(v)                   ((v))
 171 #define MANAGEMENT_ORB_FUNCTION(v)              ((v) << 16)
 172 #define MANAGEMENT_ORB_RECONNECT(v)             ((v) << 20)
 173 #define MANAGEMENT_ORB_EXCLUSIVE(v)             ((v) ? 1 << 28 : 0)
 174 #define MANAGEMENT_ORB_REQUEST_FORMAT(v)        ((v) << 29)
 175 #define MANAGEMENT_ORB_NOTIFY                   ((1) << 31)
 176
 177 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v)       ((v))
 178 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v)       ((v) << 16)
 179
 180 struct sbp2_management_orb {
 181         struct sbp2_orb base;
 182         struct {
 183                 struct sbp2_pointer password;
 184                 struct sbp2_pointer response;
 185                 u32 misc;
 186                 u32 length;
 187                 struct sbp2_pointer status_fifo;
 188         } request;
 189         __be32 response[4];
 190         dma_addr_t response_bus;
 191         struct completion done;
 192         struct sbp2_status status;
 193 };
 194
 195 #define LOGIN_RESPONSE_GET_LOGIN_ID(v)  ((v).misc & 0xffff)
 196 #define LOGIN_RESPONSE_GET_LENGTH(v)    (((v).misc >> 16) & 0xffff)
 197
 198 struct sbp2_login_response {
 199         u32 misc;
 200         struct sbp2_pointer command_block_agent;
 201         u32 reconnect_hold;
 202 };
 203 #define COMMAND_ORB_DATA_SIZE(v)        ((v))
 204 #define COMMAND_ORB_PAGE_SIZE(v)        ((v) << 16)
 205 #define COMMAND_ORB_PAGE_TABLE_PRESENT  ((1) << 19)
 206 #define COMMAND_ORB_MAX_PAYLOAD(v)      ((v) << 20)
 207 #define COMMAND_ORB_SPEED(v)            ((v) << 24)
 208 #define COMMAND_ORB_DIRECTION(v)        ((v) << 27)
 209 #define COMMAND_ORB_REQUEST_FORMAT(v)   ((v) << 29)
 210 #define COMMAND_ORB_NOTIFY              ((1) << 31)
 211
 212 struct sbp2_command_orb {
 213         struct sbp2_orb base;
 214         struct {
 215                 struct sbp2_pointer next;
 216                 struct sbp2_pointer data_descriptor;
 217                 u32 misc;
 218                 u8 command_block[12];
 219         } request;
 220         struct scsi_cmnd *cmd;
 221         scsi_done_fn_t done;
 222         struct fw_unit *unit;
 223
 224         struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
 225         dma_addr_t page_table_bus;
 226 };
 227
 228 /*
 229  * List of devices with known bugs.
 230  *
 231  * The firmware_revision field, masked with 0xffff00, is the best
 232  * indicator for the type of bridge chip of a device.  It yields a few
 233  * false positives but this did not break correctly behaving devices
 234  * so far.  We use ~0 as a wildcard, since the 24 bit values we get
 235  * from the config rom can never match that.
 236  */
 237 static const struct {
 238         u32 firmware_revision;
 239         u32 model;
 240         unsigned workarounds;
 241 } sbp2_workarounds_table[] = {
 242         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
 243                 .firmware_revision      = 0x002800,
 244                 .model                  = 0x001010,
 245                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
 246                                           SBP2_WORKAROUND_MODE_SENSE_8,
 247         },
 248         /* Initio bridges, actually only needed for some older ones */ {
 249                 .firmware_revision      = 0x000200,
 250                 .model                  = ~0,
 251                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36,
 252         },
 253         /* Symbios bridge */ {
 254                 .firmware_revision      = 0xa0b800,
 255                 .model                  = ~0,
 256                 .workarounds            = SBP2_WORKAROUND_128K_MAX_TRANS,
 257         },
 258
 259         /*
 260          * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
 261          * these iPods do not feature the read_capacity bug according
 262          * to one report.  Read_capacity behaviour as well as model_id
 263          * could change due to Apple-supplied firmware updates though.
 264          */
 265
 266         /* iPod 4th generation. */ {
 267                 .firmware_revision      = 0x0a2700,
 268                 .model                  = 0x000021,
 269                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 270         },
 271         /* iPod mini */ {
 272                 .firmware_revision      = 0x0a2700,
 273                 .model                  = 0x000023,
 274                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 275         },
 276         /* iPod Photo */ {
 277                 .firmware_revision      = 0x0a2700,
 278                 .model                  = 0x00007e,
 279                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 280         }
 281 };
 282
 283 static void
 284 free_orb(struct kref *kref)
 285 {
 286         struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
 287
 288         kfree(orb);
 289 }
 290
 291 static void
 292 sbp2_status_write(struct fw_card *card, struct fw_request *request,
 293                   int tcode, int destination, int source,
 294                   int generation, int speed,
 295                   unsigned long long offset,
 296                   void *payload, size_t length, void *callback_data)
 297 {
 298         struct sbp2_device *sd = callback_data;
 299         struct sbp2_orb *orb;
 300         struct sbp2_status status;
 301         size_t header_size;
 302         unsigned long flags;
 303
 304         if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
 305             length == 0 || length > sizeof(status)) {
 306                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 307                 return;
 308         }
 309
 310         header_size = min(length, 2 * sizeof(u32));
 311         fw_memcpy_from_be32(&status, payload, header_size);
 312         if (length > header_size)
 313                 memcpy(status.data, payload + 8, length - header_size);
 314         if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
 315                 fw_notify("non-orb related status write, not handled\n");
 316                 fw_send_response(card, request, RCODE_COMPLETE);
 317                 return;
 318         }
 319
 320         /* Lookup the orb corresponding to this status write. */
 321         spin_lock_irqsave(&card->lock, flags);
 322         list_for_each_entry(orb, &sd->orb_list, link) {
 323                 if (STATUS_GET_ORB_HIGH(status) == 0 &&
 324                     STATUS_GET_ORB_LOW(status) == orb->request_bus) {
 325                         orb->rcode = RCODE_COMPLETE;
 326                         list_del(&orb->link);
 327                         break;
 328                 }
 329         }
 330         spin_unlock_irqrestore(&card->lock, flags);
 331
 332         if (&orb->link != &sd->orb_list)
 333                 orb->callback(orb, &status);
 334         else
 335                 fw_error("status write for unknown orb\n");
 336
 337         kref_put(&orb->kref, free_orb);
 338
 339         fw_send_response(card, request, RCODE_COMPLETE);
 340 }
 341
 342 static void
 343 complete_transaction(struct fw_card *card, int rcode,
 344                      void *payload, size_t length, void *data)
 345 {
 346         struct sbp2_orb *orb = data;
 347         unsigned long flags;
 348
 349         /*
 350          * This is a little tricky.  We can get the status write for
 351          * the orb before we get this callback.  The status write
 352          * handler above will assume the orb pointer transaction was
 353          * successful and set the rcode to RCODE_COMPLETE for the orb.
 354          * So this callback only sets the rcode if it hasn't already
 355          * been set and only does the cleanup if the transaction
 356          * failed and we didn't already get a status write.
 357          */
 358         spin_lock_irqsave(&card->lock, flags);
 359
 360         if (orb->rcode == -1)
 361                 orb->rcode = rcode;
 362         if (orb->rcode != RCODE_COMPLETE) {
 363                 list_del(&orb->link);
 364                 orb->callback(orb, NULL);
 365         }
 366
 367         spin_unlock_irqrestore(&card->lock, flags);
 368
 369         kref_put(&orb->kref, free_orb);
 370 }
 371
 372 static void
 373 sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit,
 374               int node_id, int generation, u64 offset)
 375 {
 376         struct fw_device *device = fw_device(unit->device.parent);
 377         struct sbp2_device *sd = unit->device.driver_data;
 378         unsigned long flags;
 379
 380         orb->pointer.high = 0;
 381         orb->pointer.low = orb->request_bus;
 382         fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer));
 383
 384         spin_lock_irqsave(&device->card->lock, flags);
 385         list_add_tail(&orb->link, &sd->orb_list);
 386         spin_unlock_irqrestore(&device->card->lock, flags);
 387
 388         /* Take a ref for the orb list and for the transaction callback. */
 389         kref_get(&orb->kref);
 390         kref_get(&orb->kref);
 391
 392         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
 393                         node_id, generation, device->max_speed, offset,
 394                         &orb->pointer, sizeof(orb->pointer),
 395                         complete_transaction, orb);
 396 }
 397
 398 static int sbp2_cancel_orbs(struct fw_unit *unit)
 399 {
 400         struct fw_device *device = fw_device(unit->device.parent);
 401         struct sbp2_device *sd = unit->device.driver_data;
 402         struct sbp2_orb *orb, *next;
 403         struct list_head list;
 404         unsigned long flags;
 405         int retval = -ENOENT;
 406
 407         INIT_LIST_HEAD(&list);
 408         spin_lock_irqsave(&device->card->lock, flags);
 409         list_splice_init(&sd->orb_list, &list);
 410         spin_unlock_irqrestore(&device->card->lock, flags);
 411
 412         list_for_each_entry_safe(orb, next, &list, link) {
 413                 retval = 0;
 414                 if (fw_cancel_transaction(device->card, &orb->t) == 0)
 415                         continue;
 416
 417                 orb->rcode = RCODE_CANCELLED;
 418                 orb->callback(orb, NULL);
 419         }
 420
 421         return retval;
 422 }
 423
 424 static void
 425 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 426 {
 427         struct sbp2_management_orb *orb =
 428                 container_of(base_orb, struct sbp2_management_orb, base);
 429
 430         if (status)
 431                 memcpy(&orb->status, status, sizeof(*status));
 432         complete(&orb->done);
 433 }
 434
 435 static int
 436 sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
 437                          int function, int lun, void *response)
 438 {
 439         struct fw_device *device = fw_device(unit->device.parent);
 440         struct sbp2_device *sd = unit->device.driver_data;
 441         struct sbp2_management_orb *orb;
 442         int retval = -ENOMEM;
 443
 444         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 445         if (orb == NULL)
 446                 return -ENOMEM;
 447
 448         kref_init(&orb->base.kref);
 449         orb->response_bus =
 450                 dma_map_single(device->card->device, &orb->response,
 451                                sizeof(orb->response), DMA_FROM_DEVICE);
 452         if (dma_mapping_error(orb->response_bus))
 453                 goto fail_mapping_response;
 454
 455         orb->request.response.high    = 0;
 456         orb->request.response.low     = orb->response_bus;
 457
 458         orb->request.misc =
 459                 MANAGEMENT_ORB_NOTIFY |
 460                 MANAGEMENT_ORB_FUNCTION(function) |
 461                 MANAGEMENT_ORB_LUN(lun);
 462         orb->request.length =
 463                 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response));
 464
 465         orb->request.status_fifo.high = sd->address_handler.offset >> 32;
 466         orb->request.status_fifo.low  = sd->address_handler.offset;
 467
 468         if (function == SBP2_LOGIN_REQUEST) {
 469                 orb->request.misc |=
 470                         MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login) |
 471                         MANAGEMENT_ORB_RECONNECT(0);
 472         }
 473
 474         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
 475
 476         init_completion(&orb->done);
 477         orb->base.callback = complete_management_orb;
 478
 479         orb->base.request_bus =
 480                 dma_map_single(device->card->device, &orb->request,
 481                                sizeof(orb->request), DMA_TO_DEVICE);
 482         if (dma_mapping_error(orb->base.request_bus))
 483                 goto fail_mapping_request;
 484
 485         sbp2_send_orb(&orb->base, unit,
 486                       node_id, generation, sd->management_agent_address);
 487
 488         wait_for_completion_timeout(&orb->done,
 489                                     msecs_to_jiffies(SBP2_ORB_TIMEOUT));
 490
 491         retval = -EIO;
 492         if (sbp2_cancel_orbs(unit) == 0) {
 493                 fw_error("orb reply timed out, rcode=0x%02x\n",
 494                          orb->base.rcode);
 495                 goto out;
 496         }
 497
 498         if (orb->base.rcode != RCODE_COMPLETE) {
 499                 fw_error("management write failed, rcode 0x%02x\n",
 500                          orb->base.rcode);
 501                 goto out;
 502         }
 503
 504         if (STATUS_GET_RESPONSE(orb->status) != 0 ||
 505             STATUS_GET_SBP_STATUS(orb->status) != 0) {
 506                 fw_error("error status: %d:%d\n",
 507                          STATUS_GET_RESPONSE(orb->status),
 508                          STATUS_GET_SBP_STATUS(orb->status));
 509                 goto out;
 510         }
 511
 512         retval = 0;
 513  out:
 514         dma_unmap_single(device->card->device, orb->base.request_bus,
 515                          sizeof(orb->request), DMA_TO_DEVICE);
 516  fail_mapping_request:
 517         dma_unmap_single(device->card->device, orb->response_bus,
 518                          sizeof(orb->response), DMA_FROM_DEVICE);
 519  fail_mapping_response:
 520         if (response)
 521                 fw_memcpy_from_be32(response,
 522                                     orb->response, sizeof(orb->response));
 523         kref_put(&orb->base.kref, free_orb);
 524
 525         return retval;
 526 }
 527
 528 static void
 529 complete_agent_reset_write(struct fw_card *card, int rcode,
 530                            void *payload, size_t length, void *data)
 531 {
 532         struct fw_transaction *t = data;
 533
 534         kfree(t);
 535 }
 536
 537 static int sbp2_agent_reset(struct fw_unit *unit)
 538 {
 539         struct fw_device *device = fw_device(unit->device.parent);
 540         struct sbp2_device *sd = unit->device.driver_data;
 541         struct fw_transaction *t;
 542         static u32 zero;
 543
 544         t = kzalloc(sizeof(*t), GFP_ATOMIC);
 545         if (t == NULL)
 546                 return -ENOMEM;
 547
 548         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 549                         sd->node_id, sd->generation, device->max_speed,
 550                         sd->command_block_agent_address + SBP2_AGENT_RESET,
 551                         &zero, sizeof(zero), complete_agent_reset_write, t);
 552
 553         return 0;
 554 }
 555
 556 static void sbp2_reconnect(struct work_struct *work);
 557 static struct scsi_host_template scsi_driver_template;
 558
 559 static void release_sbp2_device(struct kref *kref)
 560 {
 561         struct sbp2_device *sd = container_of(kref, struct sbp2_device, kref);
 562         struct Scsi_Host *host =
 563                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 564
 565         scsi_remove_host(host);
 566         sbp2_send_management_orb(sd->unit, sd->node_id, sd->generation,
 567                                  SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
 568         fw_core_remove_address_handler(&sd->address_handler);
 569         fw_notify("removed sbp2 unit %s\n", sd->unit->device.bus_id);
 570         put_device(&sd->unit->device);
 571         scsi_host_put(host);
 572 }
 573
 574 static void sbp2_login(struct work_struct *work)
 575 {
 576         struct sbp2_device *sd =
 577                 container_of(work, struct sbp2_device, work.work);
 578         struct Scsi_Host *host =
 579                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 580         struct fw_unit *unit = sd->unit;
 581         struct fw_device *device = fw_device(unit->device.parent);
 582         struct sbp2_login_response response;
 583         int generation, node_id, local_node_id, lun, retval;
 584
 585         /* FIXME: Make this work for multi-lun devices. */
 586         lun = 0;
 587
 588         generation    = device->card->generation;
 589         node_id       = device->node->node_id;
 590         local_node_id = device->card->local_node->node_id;
 591
 592         if (sbp2_send_management_orb(unit, node_id, generation,
 593                                      SBP2_LOGIN_REQUEST, lun, &response) < 0) {
 594                 if (sd->retries++ < 5) {
 595                         schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 596                 } else {
 597                         fw_error("failed to login to %s\n",
 598                                  unit->device.bus_id);
 599                         kref_put(&sd->kref, release_sbp2_device);
 600                 }
 601                 return;
 602         }
 603
 604         sd->generation   = generation;
 605         sd->node_id      = node_id;
 606         sd->address_high = local_node_id << 16;
 607
 608         /* Get command block agent offset and login id. */
 609         sd->command_block_agent_address =
 610                 ((u64) (response.command_block_agent.high & 0xffff) << 32) |
 611                 response.command_block_agent.low;
 612         sd->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
 613
 614         fw_notify("logged in to sbp2 unit %s (%d retries)\n",
 615                   unit->device.bus_id, sd->retries);
 616         fw_notify(" - management_agent_address:    0x%012llx\n",
 617                   (unsigned long long) sd->management_agent_address);
 618         fw_notify(" - command_block_agent_address: 0x%012llx\n",
 619                   (unsigned long long) sd->command_block_agent_address);
 620         fw_notify(" - status write address:        0x%012llx\n",
 621                   (unsigned long long) sd->address_handler.offset);
 622
 623 #if 0
 624         /* FIXME: The linux1394 sbp2 does this last step. */
 625         sbp2_set_busy_timeout(scsi_id);
 626 #endif
 627
 628         PREPARE_DELAYED_WORK(&sd->work, sbp2_reconnect);
 629         sbp2_agent_reset(unit);
 630
 631         /* FIXME: Loop over luns here. */
 632         lun = 0;
 633         retval = scsi_add_device(host, 0, 0, lun);
 634         if (retval < 0) {
 635                 sbp2_send_management_orb(unit, sd->node_id, sd->generation,
 636                                          SBP2_LOGOUT_REQUEST, sd->login_id,
 637                                          NULL);
 638                 /*
 639                  * Set this back to sbp2_login so we fall back and
 640                  * retry login on bus reset.
 641                  */
 642                 PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 643         }
 644         kref_put(&sd->kref, release_sbp2_device);
 645 }
 646
 647 static int sbp2_probe(struct device *dev)
 648 {
 649         struct fw_unit *unit = fw_unit(dev);
 650         struct fw_device *device = fw_device(unit->device.parent);
 651         struct sbp2_device *sd;
 652         struct fw_csr_iterator ci;
 653         struct Scsi_Host *host;
 654         int i, key, value, err;
 655         u32 model, firmware_revision;
 656
 657         err = -ENOMEM;
 658         host = scsi_host_alloc(&scsi_driver_template, sizeof(*sd));
 659         if (host == NULL)
 660                 goto fail;
 661
 662         sd = (struct sbp2_device *) host->hostdata;
 663         unit->device.driver_data = sd;
 664         sd->unit = unit;
 665         INIT_LIST_HEAD(&sd->orb_list);
 666         kref_init(&sd->kref);
 667
 668         sd->address_handler.length = 0x100;
 669         sd->address_handler.address_callback = sbp2_status_write;
 670         sd->address_handler.callback_data = sd;
 671
 672         err = fw_core_add_address_handler(&sd->address_handler,
 673                                           &fw_high_memory_region);
 674         if (err < 0)
 675                 goto fail_host;
 676
 677         err = fw_device_enable_phys_dma(device);
 678         if (err < 0)
 679                 goto fail_address_handler;
 680
 681         err = scsi_add_host(host, &unit->device);
 682         if (err < 0)
 683                 goto fail_address_handler;
 684
 685         /*
 686          * Scan unit directory to get management agent address,
 687          * firmware revison and model.  Initialize firmware_revision
 688          * and model to values that wont match anything in our table.
 689          */
 690         firmware_revision = 0xff000000;
 691         model = 0xff000000;
 692         fw_csr_iterator_init(&ci, unit->directory);
 693         while (fw_csr_iterator_next(&ci, &key, &value)) {
 694                 switch (key) {
 695                 case CSR_DEPENDENT_INFO | CSR_OFFSET:
 696                         sd->management_agent_address =
 697                                 0xfffff0000000ULL + 4 * value;
 698                         break;
 699                 case SBP2_FIRMWARE_REVISION:
 700                         firmware_revision = value;
 701                         break;
 702                 case CSR_MODEL:
 703                         model = value;
 704                         break;
 705                 }
 706         }
 707
 708         for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 709                 if (sbp2_workarounds_table[i].firmware_revision !=
 710                     (firmware_revision & 0xffffff00))
 711                         continue;
 712                 if (sbp2_workarounds_table[i].model != model &&
 713                     sbp2_workarounds_table[i].model != ~0)
 714                         continue;
 715                 sd->workarounds |= sbp2_workarounds_table[i].workarounds;
 716                 break;
 717         }
 718
 719         if (sd->workarounds)
 720                 fw_notify("Workarounds for node %s: 0x%x "
 721                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
 722                           unit->device.bus_id,
 723                           sd->workarounds, firmware_revision, model);
 724
 725         get_device(&unit->device);
 726
 727         /*
 728          * We schedule work to do the login so we can easily
 729          * reschedule retries. Always get the ref before scheduling
 730          * work.
 731          */
 732         INIT_DELAYED_WORK(&sd->work, sbp2_login);
 733         if (schedule_delayed_work(&sd->work, 0))
 734                 kref_get(&sd->kref);
 735
 736         return 0;
 737
 738  fail_address_handler:
 739         fw_core_remove_address_handler(&sd->address_handler);
 740  fail_host:
 741         scsi_host_put(host);
 742  fail:
 743         return err;
 744 }
 745
 746 static int sbp2_remove(struct device *dev)
 747 {
 748         struct fw_unit *unit = fw_unit(dev);
 749         struct sbp2_device *sd = unit->device.driver_data;
 750
 751         kref_put(&sd->kref, release_sbp2_device);
 752
 753         return 0;
 754 }
 755
 756 static void sbp2_reconnect(struct work_struct *work)
 757 {
 758         struct sbp2_device *sd =
 759                 container_of(work, struct sbp2_device, work.work);
 760         struct fw_unit *unit = sd->unit;
 761         struct fw_device *device = fw_device(unit->device.parent);
 762         int generation, node_id, local_node_id;
 763
 764         generation    = device->card->generation;
 765         node_id       = device->node->node_id;
 766         local_node_id = device->card->local_node->node_id;
 767
 768         if (sbp2_send_management_orb(unit, node_id, generation,
 769                                      SBP2_RECONNECT_REQUEST,
 770                                      sd->login_id, NULL) < 0) {
 771                 if (sd->retries++ >= 5) {
 772                         fw_error("failed to reconnect to %s\n",
 773                                  unit->device.bus_id);
 774                         /* Fall back and try to log in again. */
 775                         sd->retries = 0;
 776                         PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 777                 }
 778                 schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 779                 return;
 780         }
 781
 782         sd->generation   = generation;
 783         sd->node_id      = node_id;
 784         sd->address_high = local_node_id << 16;
 785
 786         fw_notify("reconnected to unit %s (%d retries)\n",
 787                   unit->device.bus_id, sd->retries);
 788         sbp2_agent_reset(unit);
 789         sbp2_cancel_orbs(unit);
 790         kref_put(&sd->kref, release_sbp2_device);
 791 }
 792
 793 static void sbp2_update(struct fw_unit *unit)
 794 {
 795         struct fw_device *device = fw_device(unit->device.parent);
 796         struct sbp2_device *sd = unit->device.driver_data;
 797
 798         sd->retries = 0;
 799         fw_device_enable_phys_dma(device);
 800         if (schedule_delayed_work(&sd->work, 0))
 801                 kref_get(&sd->kref);
 802 }
 803
 804 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 805 #define SBP2_SW_VERSION_ENTRY   0x00010483
 806
 807 static const struct fw_device_id sbp2_id_table[] = {
 808         {
 809                 .match_flags  = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
 810                 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
 811                 .version      = SBP2_SW_VERSION_ENTRY,
 812         },
 813         { }
 814 };
 815
 816 static struct fw_driver sbp2_driver = {
 817         .driver   = {
 818                 .owner  = THIS_MODULE,
 819                 .name   = sbp2_driver_name,
 820                 .bus    = &fw_bus_type,
 821                 .probe  = sbp2_probe,
 822                 .remove = sbp2_remove,
 823         },
 824         .update   = sbp2_update,
 825         .id_table = sbp2_id_table,
 826 };
 827
 828 static unsigned int
 829 sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
 830 {
 831         int sam_status;
 832
 833         sense_data[0] = 0x70;
 834         sense_data[1] = 0x0;
 835         sense_data[2] = sbp2_status[1];
 836         sense_data[3] = sbp2_status[4];
 837         sense_data[4] = sbp2_status[5];
 838         sense_data[5] = sbp2_status[6];
 839         sense_data[6] = sbp2_status[7];
 840         sense_data[7] = 10;
 841         sense_data[8] = sbp2_status[8];
 842         sense_data[9] = sbp2_status[9];
 843         sense_data[10] = sbp2_status[10];
 844         sense_data[11] = sbp2_status[11];
 845         sense_data[12] = sbp2_status[2];
 846         sense_data[13] = sbp2_status[3];
 847         sense_data[14] = sbp2_status[12];
 848         sense_data[15] = sbp2_status[13];
 849
 850         sam_status = sbp2_status[0] & 0x3f;
 851
 852         switch (sam_status) {
 853         case SAM_STAT_GOOD:
 854         case SAM_STAT_CHECK_CONDITION:
 855         case SAM_STAT_CONDITION_MET:
 856         case SAM_STAT_BUSY:
 857         case SAM_STAT_RESERVATION_CONFLICT:
 858         case SAM_STAT_COMMAND_TERMINATED:
 859                 return DID_OK << 16 | sam_status;
 860
 861         default:
 862                 return DID_ERROR << 16;
 863         }
 864 }
 865
 866 static void
 867 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 868 {
 869         struct sbp2_command_orb *orb =
 870                 container_of(base_orb, struct sbp2_command_orb, base);
 871         struct fw_unit *unit = orb->unit;
 872         struct fw_device *device = fw_device(unit->device.parent);
 873         int result;
 874
 875         if (status != NULL) {
 876                 if (STATUS_GET_DEAD(*status))
 877                         sbp2_agent_reset(unit);
 878
 879                 switch (STATUS_GET_RESPONSE(*status)) {
 880                 case SBP2_STATUS_REQUEST_COMPLETE:
 881                         result = DID_OK << 16;
 882                         break;
 883                 case SBP2_STATUS_TRANSPORT_FAILURE:
 884                         result = DID_BUS_BUSY << 16;
 885                         break;
 886                 case SBP2_STATUS_ILLEGAL_REQUEST:
 887                 case SBP2_STATUS_VENDOR_DEPENDENT:
 888                 default:
 889                         result = DID_ERROR << 16;
 890                         break;
 891                 }
 892
 893                 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
 894                         result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
 895                                                            orb->cmd->sense_buffer);
 896         } else {
 897                 /*
 898                  * If the orb completes with status == NULL, something
 899                  * went wrong, typically a bus reset happened mid-orb
 900                  * or when sending the write (less likely).
 901                  */
 902                 result = DID_BUS_BUSY << 16;
 903         }
 904
 905         dma_unmap_single(device->card->device, orb->base.request_bus,
 906                          sizeof(orb->request), DMA_TO_DEVICE);
 907
 908         if (scsi_sg_count(orb->cmd) > 0)
 909                 dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
 910                              scsi_sg_count(orb->cmd),
 911                              orb->cmd->sc_data_direction);
 912
 913         if (orb->page_table_bus != 0)
 914                 dma_unmap_single(device->card->device, orb->page_table_bus,
 915                                  sizeof(orb->page_table), DMA_TO_DEVICE);
 916
 917         orb->cmd->result = result;
 918         orb->done(orb->cmd);
 919 }
 920
 921 static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
 922 {
 923         struct sbp2_device *sd =
 924                 (struct sbp2_device *)orb->cmd->device->host->hostdata;
 925         struct fw_unit *unit = sd->unit;
 926         struct fw_device *device = fw_device(unit->device.parent);
 927         struct scatterlist *sg;
 928         int sg_len, l, i, j, count;
 929         dma_addr_t sg_addr;
 930
 931         sg = scsi_sglist(orb->cmd);
 932         count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
 933                            orb->cmd->sc_data_direction);
 934         if (count == 0)
 935                 goto fail;
 936
 937         /*
 938          * Handle the special case where there is only one element in
 939          * the scatter list by converting it to an immediate block
 940          * request. This is also a workaround for broken devices such
 941          * as the second generation iPod which doesn't support page
 942          * tables.
 943          */
 944         if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
 945                 orb->request.data_descriptor.high = sd->address_high;
 946                 orb->request.data_descriptor.low  = sg_dma_address(sg);
 947                 orb->request.misc |=
 948                         COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
 949                 return 0;
 950         }
 951
 952         /*
 953          * Convert the scatterlist to an sbp2 page table.  If any
 954          * scatterlist entries are too big for sbp2, we split them as we
 955          * go.  Even if we ask the block I/O layer to not give us sg
 956          * elements larger than 65535 bytes, some IOMMUs may merge sg elements
 957          * during DMA mapping, and Linux currently doesn't prevent this.
 958          */
 959         for (i = 0, j = 0; i < count; i++) {
 960                 sg_len = sg_dma_len(sg + i);
 961                 sg_addr = sg_dma_address(sg + i);
 962                 while (sg_len) {
 963                         /* FIXME: This won't get us out of the pinch. */
 964                         if (unlikely(j >= ARRAY_SIZE(orb->page_table))) {
 965                                 fw_error("page table overflow\n");
 966                                 goto fail_page_table;
 967                         }
 968                         l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
 969                         orb->page_table[j].low = sg_addr;
 970                         orb->page_table[j].high = (l << 16);
 971                         sg_addr += l;
 972                         sg_len -= l;
 973                         j++;
 974                 }
 975         }
 976
 977         fw_memcpy_to_be32(orb->page_table, orb->page_table,
 978                           sizeof(orb->page_table[0]) * j);
 979         orb->page_table_bus =
 980                 dma_map_single(device->card->device, orb->page_table,
 981                                sizeof(orb->page_table), DMA_TO_DEVICE);
 982         if (dma_mapping_error(orb->page_table_bus))
 983                 goto fail_page_table;
 984
 985         /*
 986          * The data_descriptor pointer is the one case where we need
 987          * to fill in the node ID part of the address.  All other
 988          * pointers assume that the data referenced reside on the
 989          * initiator (i.e. us), but data_descriptor can refer to data
 990          * on other nodes so we need to put our ID in descriptor.high.
 991          */
 992         orb->request.data_descriptor.high = sd->address_high;
 993         orb->request.data_descriptor.low  = orb->page_table_bus;
 994         orb->request.misc |=
 995                 COMMAND_ORB_PAGE_TABLE_PRESENT |
 996                 COMMAND_ORB_DATA_SIZE(j);
 997
 998         return 0;
 999
1000  fail_page_table:
1001         dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
1002                      orb->cmd->sc_data_direction);
1003  fail:
1004         return -ENOMEM;
1005 }
1006
1007 /* SCSI stack integration */
1008
1009 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
1010 {
1011         struct sbp2_device *sd =
1012                 (struct sbp2_device *)cmd->device->host->hostdata;
1013         struct fw_unit *unit = sd->unit;
1014         struct fw_device *device = fw_device(unit->device.parent);
1015         struct sbp2_command_orb *orb;
1016         unsigned max_payload;
1017
1018         /*
1019          * Bidirectional commands are not yet implemented, and unknown
1020          * transfer direction not handled.
1021          */
1022         if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
1023                 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
1024                 cmd->result = DID_ERROR << 16;
1025                 done(cmd);
1026                 return 0;
1027         }
1028
1029         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
1030         if (orb == NULL) {
1031                 fw_notify("failed to alloc orb\n");
1032                 goto fail_alloc;
1033         }
1034
1035         /* Initialize rcode to something not RCODE_COMPLETE. */
1036         orb->base.rcode = -1;
1037         kref_init(&orb->base.kref);
1038
1039         orb->unit = unit;
1040         orb->done = done;
1041         orb->cmd  = cmd;
1042
1043         orb->request.next.high   = SBP2_ORB_NULL;
1044         orb->request.next.low    = 0x0;
1045         /*
1046          * At speed 100 we can do 512 bytes per packet, at speed 200,
1047          * 1024 bytes per packet etc.  The SBP-2 max_payload field
1048          * specifies the max payload size as 2 ^ (max_payload + 2), so
1049          * if we set this to max_speed + 7, we get the right value.
1050          */
1051         max_payload = min(device->max_speed + 7,
1052                           device->card->max_receive - 1);
1053         orb->request.misc =
1054                 COMMAND_ORB_MAX_PAYLOAD(max_payload) |
1055                 COMMAND_ORB_SPEED(device->max_speed) |
1056                 COMMAND_ORB_NOTIFY;
1057
1058         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1059                 orb->request.misc |=
1060                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA);
1061         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
1062                 orb->request.misc |=
1063                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
1064
1065         if (scsi_sg_count(cmd) && sbp2_command_orb_map_scatterlist(orb) < 0)
1066                 goto fail_mapping;
1067
1068         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
1069
1070         memset(orb->request.command_block,
1071                0, sizeof(orb->request.command_block));
1072         memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
1073
1074         orb->base.callback = complete_command_orb;
1075         orb->base.request_bus =
1076                 dma_map_single(device->card->device, &orb->request,
1077                                sizeof(orb->request), DMA_TO_DEVICE);
1078         if (dma_mapping_error(orb->base.request_bus))
1079                 goto fail_mapping;
1080
1081         sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation,
1082                       sd->command_block_agent_address + SBP2_ORB_POINTER);
1083
1084         kref_put(&orb->base.kref, free_orb);
1085         return 0;
1086
1087  fail_mapping:
1088         kref_put(&orb->base.kref, free_orb);
1089  fail_alloc:
1090         return SCSI_MLQUEUE_HOST_BUSY;
1091 }
1092
1093 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1094 {
1095         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1096
1097         sdev->allow_restart = 1;
1098
1099         if (sd->workarounds & SBP2_WORKAROUND_INQUIRY_36)
1100                 sdev->inquiry_len = 36;
1101         return 0;
1102 }
1103
1104 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1105 {
1106         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1107         struct fw_unit *unit = sd->unit;
1108
1109         sdev->use_10_for_rw = 1;
1110
1111         if (sdev->type == TYPE_ROM)
1112                 sdev->use_10_for_ms = 1;
1113         if (sdev->type == TYPE_DISK &&
1114             sd->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
1115                 sdev->skip_ms_page_8 = 1;
1116         if (sd->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) {
1117                 fw_notify("setting fix_capacity for %s\n", unit->device.bus_id);
1118                 sdev->fix_capacity = 1;
1119         }
1120         if (sd->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
1121                 blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
1122         return 0;
1123 }
1124
1125 /*
1126  * Called by scsi stack when something has really gone wrong.  Usually
1127  * called when a command has timed-out for some reason.
1128  */
1129 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1130 {
1131         struct sbp2_device *sd =
1132                 (struct sbp2_device *)cmd->device->host->hostdata;
1133         struct fw_unit *unit = sd->unit;
1134
1135         fw_notify("sbp2_scsi_abort\n");
1136         sbp2_agent_reset(unit);
1137         sbp2_cancel_orbs(unit);
1138
1139         return SUCCESS;
1140 }
1141
1142 /*
1143  * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1144  * u64 EUI-64 : u24 directory_ID : u16 LUN  (all printed in hexadecimal)
1145  *
1146  * This is the concatenation of target port identifier and logical unit
1147  * identifier as per SAM-2...SAM-4 annex A.
1148  */
1149 static ssize_t
1150 sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1151                             char *buf)
1152 {
1153         struct scsi_device *sdev = to_scsi_device(dev);
1154         struct sbp2_device *sd;
1155         struct fw_unit *unit;
1156         struct fw_device *device;
1157         u32 directory_id;
1158         struct fw_csr_iterator ci;
1159         int key, value, lun;
1160
1161         if (!sdev)
1162                 return 0;
1163         sd = (struct sbp2_device *)sdev->host->hostdata;
1164         unit = sd->unit;
1165         device = fw_device(unit->device.parent);
1166
1167         /* implicit directory ID */
1168         directory_id = ((unit->directory - device->config_rom) * 4
1169                         + CSR_CONFIG_ROM) & 0xffffff;
1170
1171         /* explicit directory ID, overrides implicit ID if present */
1172         fw_csr_iterator_init(&ci, unit->directory);
1173         while (fw_csr_iterator_next(&ci, &key, &value))
1174                 if (key == CSR_DIRECTORY_ID) {
1175                         directory_id = value;
1176                         break;
1177                 }
1178
1179         /* FIXME: Make this work for multi-lun devices. */
1180         lun = 0;
1181
1182         return sprintf(buf, "%08x%08x:%06x:%04x\n",
1183                         device->config_rom[3], device->config_rom[4],
1184                         directory_id, lun);
1185 }
1186
1187 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1188
1189 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1190         &dev_attr_ieee1394_id,
1191         NULL
1192 };
1193
1194 static struct scsi_host_template scsi_driver_template = {
1195         .module                 = THIS_MODULE,
1196         .name                   = "SBP-2 IEEE-1394",
1197         .proc_name              = sbp2_driver_name,
1198         .queuecommand           = sbp2_scsi_queuecommand,
1199         .slave_alloc            = sbp2_scsi_slave_alloc,
1200         .slave_configure        = sbp2_scsi_slave_configure,
1201         .eh_abort_handler       = sbp2_scsi_abort,
1202         .this_id                = -1,
1203         .sg_tablesize           = SG_ALL,
1204         .use_clustering         = ENABLE_CLUSTERING,
1205         .cmd_per_lun            = 1,
1206         .can_queue              = 1,
1207         .sdev_attrs             = sbp2_scsi_sysfs_attrs,
1208 };
1209
1210 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1211 MODULE_DESCRIPTION("SCSI over IEEE1394");
1212 MODULE_LICENSE("GPL");
1213 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1214
1215 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1216 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1217 MODULE_ALIAS("sbp2");
1218 #endif
1219
1220 static int __init sbp2_init(void)
1221 {
1222         return driver_register(&sbp2_driver.driver);
1223 }
1224
1225 static void __exit sbp2_cleanup(void)
1226 {
1227         driver_unregister(&sbp2_driver.driver);
1228 }
1229
1230 module_init(sbp2_init);
1231 module_exit(sbp2_cleanup);