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