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/timer.h>
  40
  41 #include <scsi/scsi.h>
  42 #include <scsi/scsi_cmnd.h>
  43 #include <scsi/scsi_dbg.h>
  44 #include <scsi/scsi_device.h>
  45 #include <scsi/scsi_host.h>
  46
  47 #include "fw-transaction.h"
  48 #include "fw-topology.h"
  49 #include "fw-device.h"
  50
  51 /*
  52  * So far only bridges from Oxford Semiconductor are known to support
  53  * concurrent logins. Depending on firmware, four or two concurrent logins
  54  * are possible on OXFW911 and newer Oxsemi bridges.
  55  *
  56  * Concurrent logins are useful together with cluster filesystems.
  57  */
  58 static int sbp2_param_exclusive_login = 1;
  59 module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
  60 MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
  61                  "(default = Y, use N for concurrent initiators)");
  62
  63 /* I don't know why the SCSI stack doesn't define something like this... */
  64 typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
  65
  66 static const char sbp2_driver_name[] = "sbp2";
  67
  68 struct sbp2_device {
  69         struct kref kref;
  70         struct fw_unit *unit;
  71         struct fw_address_handler address_handler;
  72         struct list_head orb_list;
  73         u64 management_agent_address;
  74         u64 command_block_agent_address;
  75         u32 workarounds;
  76         int login_id;
  77
  78         /*
  79          * We cache these addresses and only update them once we've
  80          * logged in or reconnected to the sbp2 device.  That way, any
  81          * IO to the device will automatically fail and get retried if
  82          * it happens in a window where the device is not ready to
  83          * handle it (e.g. after a bus reset but before we reconnect).
  84          */
  85         int node_id;
  86         int address_high;
  87         int generation;
  88
  89         int retries;
  90         struct delayed_work work;
  91 };
  92
  93 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
  94 #define SBP2_MAX_SECTORS                255     /* Max sectors supported */
  95 #define SBP2_ORB_TIMEOUT                2000    /* Timeout in ms */
  96
  97 #define SBP2_ORB_NULL                   0x80000000
  98
  99 #define SBP2_DIRECTION_TO_MEDIA         0x0
 100 #define SBP2_DIRECTION_FROM_MEDIA       0x1
 101
 102 /* Unit directory keys */
 103 #define SBP2_COMMAND_SET_SPECIFIER      0x38
 104 #define SBP2_COMMAND_SET                0x39
 105 #define SBP2_COMMAND_SET_REVISION       0x3b
 106 #define SBP2_FIRMWARE_REVISION          0x3c
 107
 108 /* Flags for detected oddities and brokeness */
 109 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
 110 #define SBP2_WORKAROUND_INQUIRY_36      0x2
 111 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
 112 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
 113 #define SBP2_WORKAROUND_OVERRIDE        0x100
 114
 115 /* Management orb opcodes */
 116 #define SBP2_LOGIN_REQUEST              0x0
 117 #define SBP2_QUERY_LOGINS_REQUEST       0x1
 118 #define SBP2_RECONNECT_REQUEST          0x3
 119 #define SBP2_SET_PASSWORD_REQUEST       0x4
 120 #define SBP2_LOGOUT_REQUEST             0x7
 121 #define SBP2_ABORT_TASK_REQUEST         0xb
 122 #define SBP2_ABORT_TASK_SET             0xc
 123 #define SBP2_LOGICAL_UNIT_RESET         0xe
 124 #define SBP2_TARGET_RESET_REQUEST       0xf
 125
 126 /* Offsets for command block agent registers */
 127 #define SBP2_AGENT_STATE                0x00
 128 #define SBP2_AGENT_RESET                0x04
 129 #define SBP2_ORB_POINTER                0x08
 130 #define SBP2_DOORBELL                   0x10
 131 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 132
 133 /* Status write response codes */
 134 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 135 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 136 #define SBP2_STATUS_ILLEGAL_REQUEST     0x2
 137 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 138
 139 #define STATUS_GET_ORB_HIGH(v)          ((v).status & 0xffff)
 140 #define STATUS_GET_SBP_STATUS(v)        (((v).status >> 16) & 0xff)
 141 #define STATUS_GET_LEN(v)               (((v).status >> 24) & 0x07)
 142 #define STATUS_GET_DEAD(v)              (((v).status >> 27) & 0x01)
 143 #define STATUS_GET_RESPONSE(v)          (((v).status >> 28) & 0x03)
 144 #define STATUS_GET_SOURCE(v)            (((v).status >> 30) & 0x03)
 145 #define STATUS_GET_ORB_LOW(v)           ((v).orb_low)
 146 #define STATUS_GET_DATA(v)              ((v).data)
 147
 148 struct sbp2_status {
 149         u32 status;
 150         u32 orb_low;
 151         u8 data[24];
 152 };
 153
 154 struct sbp2_pointer {
 155         u32 high;
 156         u32 low;
 157 };
 158
 159 struct sbp2_orb {
 160         struct fw_transaction t;
 161         dma_addr_t request_bus;
 162         int rcode;
 163         struct sbp2_pointer pointer;
 164         void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
 165         struct list_head link;
 166 };
 167
 168 #define MANAGEMENT_ORB_LUN(v)                   ((v))
 169 #define MANAGEMENT_ORB_FUNCTION(v)              ((v) << 16)
 170 #define MANAGEMENT_ORB_RECONNECT(v)             ((v) << 20)
 171 #define MANAGEMENT_ORB_EXCLUSIVE(v)             ((v) ? 1 << 28 : 0)
 172 #define MANAGEMENT_ORB_REQUEST_FORMAT(v)        ((v) << 29)
 173 #define MANAGEMENT_ORB_NOTIFY                   ((1) << 31)
 174
 175 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v)       ((v))
 176 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v)       ((v) << 16)
 177
 178 struct sbp2_management_orb {
 179         struct sbp2_orb base;
 180         struct {
 181                 struct sbp2_pointer password;
 182                 struct sbp2_pointer response;
 183                 u32 misc;
 184                 u32 length;
 185                 struct sbp2_pointer status_fifo;
 186         } request;
 187         __be32 response[4];
 188         dma_addr_t response_bus;
 189         struct completion done;
 190         struct sbp2_status status;
 191 };
 192
 193 #define LOGIN_RESPONSE_GET_LOGIN_ID(v)  ((v).misc & 0xffff)
 194 #define LOGIN_RESPONSE_GET_LENGTH(v)    (((v).misc >> 16) & 0xffff)
 195
 196 struct sbp2_login_response {
 197         u32 misc;
 198         struct sbp2_pointer command_block_agent;
 199         u32 reconnect_hold;
 200 };
 201 #define COMMAND_ORB_DATA_SIZE(v)        ((v))
 202 #define COMMAND_ORB_PAGE_SIZE(v)        ((v) << 16)
 203 #define COMMAND_ORB_PAGE_TABLE_PRESENT  ((1) << 19)
 204 #define COMMAND_ORB_MAX_PAYLOAD(v)      ((v) << 20)
 205 #define COMMAND_ORB_SPEED(v)            ((v) << 24)
 206 #define COMMAND_ORB_DIRECTION(v)        ((v) << 27)
 207 #define COMMAND_ORB_REQUEST_FORMAT(v)   ((v) << 29)
 208 #define COMMAND_ORB_NOTIFY              ((1) << 31)
 209
 210 struct sbp2_command_orb {
 211         struct sbp2_orb base;
 212         struct {
 213                 struct sbp2_pointer next;
 214                 struct sbp2_pointer data_descriptor;
 215                 u32 misc;
 216                 u8 command_block[12];
 217         } request;
 218         struct scsi_cmnd *cmd;
 219         scsi_done_fn_t done;
 220         struct fw_unit *unit;
 221
 222         struct sbp2_pointer page_table[SG_ALL];
 223         dma_addr_t page_table_bus;
 224 };
 225
 226 /*
 227  * List of devices with known bugs.
 228  *
 229  * The firmware_revision field, masked with 0xffff00, is the best
 230  * indicator for the type of bridge chip of a device.  It yields a few
 231  * false positives but this did not break correctly behaving devices
 232  * so far.  We use ~0 as a wildcard, since the 24 bit values we get
 233  * from the config rom can never match that.
 234  */
 235 static const struct {
 236         u32 firmware_revision;
 237         u32 model;
 238         unsigned workarounds;
 239 } sbp2_workarounds_table[] = {
 240         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
 241                 .firmware_revision      = 0x002800,
 242                 .model                  = 0x001010,
 243                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
 244                                           SBP2_WORKAROUND_MODE_SENSE_8,
 245         },
 246         /* Initio bridges, actually only needed for some older ones */ {
 247                 .firmware_revision      = 0x000200,
 248                 .model                  = ~0,
 249                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36,
 250         },
 251         /* Symbios bridge */ {
 252                 .firmware_revision      = 0xa0b800,
 253                 .model                  = ~0,
 254                 .workarounds            = SBP2_WORKAROUND_128K_MAX_TRANS,
 255         },
 256
 257         /*
 258          * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
 259          * these iPods do not feature the read_capacity bug according
 260          * to one report.  Read_capacity behaviour as well as model_id
 261          * could change due to Apple-supplied firmware updates though.
 262          */
 263
 264         /* iPod 4th generation. */ {
 265                 .firmware_revision      = 0x0a2700,
 266                 .model                  = 0x000021,
 267                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 268         },
 269         /* iPod mini */ {
 270                 .firmware_revision      = 0x0a2700,
 271                 .model                  = 0x000023,
 272                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 273         },
 274         /* iPod Photo */ {
 275                 .firmware_revision      = 0x0a2700,
 276                 .model                  = 0x00007e,
 277                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 278         }
 279 };
 280
 281 static void
 282 sbp2_status_write(struct fw_card *card, struct fw_request *request,
 283                   int tcode, int destination, int source,
 284                   int generation, int speed,
 285                   unsigned long long offset,
 286                   void *payload, size_t length, void *callback_data)
 287 {
 288         struct sbp2_device *sd = callback_data;
 289         struct sbp2_orb *orb;
 290         struct sbp2_status status;
 291         size_t header_size;
 292         unsigned long flags;
 293
 294         if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
 295             length == 0 || length > sizeof(status)) {
 296                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 297                 return;
 298         }
 299
 300         header_size = min(length, 2 * sizeof(u32));
 301         fw_memcpy_from_be32(&status, payload, header_size);
 302         if (length > header_size)
 303                 memcpy(status.data, payload + 8, length - header_size);
 304         if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
 305                 fw_notify("non-orb related status write, not handled\n");
 306                 fw_send_response(card, request, RCODE_COMPLETE);
 307                 return;
 308         }
 309
 310         /* Lookup the orb corresponding to this status write. */
 311         spin_lock_irqsave(&card->lock, flags);
 312         list_for_each_entry(orb, &sd->orb_list, link) {
 313                 if (STATUS_GET_ORB_HIGH(status) == 0 &&
 314                     STATUS_GET_ORB_LOW(status) == orb->request_bus &&
 315                     orb->rcode == RCODE_COMPLETE) {
 316                         list_del(&orb->link);
 317                         break;
 318                 }
 319         }
 320         spin_unlock_irqrestore(&card->lock, flags);
 321
 322         if (&orb->link != &sd->orb_list)
 323                 orb->callback(orb, &status);
 324         else
 325                 fw_error("status write for unknown orb\n");
 326
 327         fw_send_response(card, request, RCODE_COMPLETE);
 328 }
 329
 330 static void
 331 complete_transaction(struct fw_card *card, int rcode,
 332                      void *payload, size_t length, void *data)
 333 {
 334         struct sbp2_orb *orb = data;
 335         unsigned long flags;
 336
 337         orb->rcode = rcode;
 338         if (rcode != RCODE_COMPLETE) {
 339                 spin_lock_irqsave(&card->lock, flags);
 340                 list_del(&orb->link);
 341                 spin_unlock_irqrestore(&card->lock, flags);
 342                 orb->callback(orb, NULL);
 343         }
 344 }
 345
 346 static void
 347 sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit,
 348               int node_id, int generation, u64 offset)
 349 {
 350         struct fw_device *device = fw_device(unit->device.parent);
 351         struct sbp2_device *sd = unit->device.driver_data;
 352         unsigned long flags;
 353
 354         orb->pointer.high = 0;
 355         orb->pointer.low = orb->request_bus;
 356         fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer));
 357
 358         spin_lock_irqsave(&device->card->lock, flags);
 359         list_add_tail(&orb->link, &sd->orb_list);
 360         spin_unlock_irqrestore(&device->card->lock, flags);
 361
 362         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
 363                         node_id, generation, device->max_speed, offset,
 364                         &orb->pointer, sizeof(orb->pointer),
 365                         complete_transaction, orb);
 366 }
 367
 368 static int sbp2_cancel_orbs(struct fw_unit *unit)
 369 {
 370         struct fw_device *device = fw_device(unit->device.parent);
 371         struct sbp2_device *sd = unit->device.driver_data;
 372         struct sbp2_orb *orb, *next;
 373         struct list_head list;
 374         unsigned long flags;
 375         int retval = -ENOENT;
 376
 377         INIT_LIST_HEAD(&list);
 378         spin_lock_irqsave(&device->card->lock, flags);
 379         list_splice_init(&sd->orb_list, &list);
 380         spin_unlock_irqrestore(&device->card->lock, flags);
 381
 382         list_for_each_entry_safe(orb, next, &list, link) {
 383                 retval = 0;
 384                 if (fw_cancel_transaction(device->card, &orb->t) == 0)
 385                         continue;
 386
 387                 orb->rcode = RCODE_CANCELLED;
 388                 orb->callback(orb, NULL);
 389         }
 390
 391         return retval;
 392 }
 393
 394 static void
 395 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 396 {
 397         struct sbp2_management_orb *orb =
 398                 container_of(base_orb, struct sbp2_management_orb, base);
 399
 400         if (status)
 401                 memcpy(&orb->status, status, sizeof(*status));
 402         complete(&orb->done);
 403 }
 404
 405 static int
 406 sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
 407                          int function, int lun, void *response)
 408 {
 409         struct fw_device *device = fw_device(unit->device.parent);
 410         struct sbp2_device *sd = unit->device.driver_data;
 411         struct sbp2_management_orb *orb;
 412         int retval = -ENOMEM;
 413
 414         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 415         if (orb == NULL)
 416                 return -ENOMEM;
 417
 418         /*
 419          * The sbp2 device is going to send a block read request to
 420          * read out the request from host memory, so map it for dma.
 421          */
 422         orb->base.request_bus =
 423                 dma_map_single(device->card->device, &orb->request,
 424                                sizeof(orb->request), DMA_TO_DEVICE);
 425         if (dma_mapping_error(orb->base.request_bus))
 426                 goto out;
 427
 428         orb->response_bus =
 429                 dma_map_single(device->card->device, &orb->response,
 430                                sizeof(orb->response), DMA_FROM_DEVICE);
 431         if (dma_mapping_error(orb->response_bus))
 432                 goto out;
 433
 434         orb->request.response.high    = 0;
 435         orb->request.response.low     = orb->response_bus;
 436
 437         orb->request.misc =
 438                 MANAGEMENT_ORB_NOTIFY |
 439                 MANAGEMENT_ORB_FUNCTION(function) |
 440                 MANAGEMENT_ORB_LUN(lun);
 441         orb->request.length =
 442                 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response));
 443
 444         orb->request.status_fifo.high = sd->address_handler.offset >> 32;
 445         orb->request.status_fifo.low  = sd->address_handler.offset;
 446
 447         if (function == SBP2_LOGIN_REQUEST) {
 448                 orb->request.misc |=
 449                         MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login) |
 450                         MANAGEMENT_ORB_RECONNECT(0);
 451         }
 452
 453         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
 454
 455         init_completion(&orb->done);
 456         orb->base.callback = complete_management_orb;
 457
 458         sbp2_send_orb(&orb->base, unit,
 459                       node_id, generation, sd->management_agent_address);
 460
 461         wait_for_completion_timeout(&orb->done,
 462                                     msecs_to_jiffies(SBP2_ORB_TIMEOUT));
 463
 464         retval = -EIO;
 465         if (sbp2_cancel_orbs(unit) == 0) {
 466                 fw_error("orb reply timed out, rcode=0x%02x\n",
 467                          orb->base.rcode);
 468                 goto out;
 469         }
 470
 471         if (orb->base.rcode != RCODE_COMPLETE) {
 472                 fw_error("management write failed, rcode 0x%02x\n",
 473                          orb->base.rcode);
 474                 goto out;
 475         }
 476
 477         if (STATUS_GET_RESPONSE(orb->status) != 0 ||
 478             STATUS_GET_SBP_STATUS(orb->status) != 0) {
 479                 fw_error("error status: %d:%d\n",
 480                          STATUS_GET_RESPONSE(orb->status),
 481                          STATUS_GET_SBP_STATUS(orb->status));
 482                 goto out;
 483         }
 484
 485         retval = 0;
 486  out:
 487         dma_unmap_single(device->card->device, orb->base.request_bus,
 488                          sizeof(orb->request), DMA_TO_DEVICE);
 489         dma_unmap_single(device->card->device, orb->response_bus,
 490                          sizeof(orb->response), DMA_FROM_DEVICE);
 491
 492         if (response)
 493                 fw_memcpy_from_be32(response,
 494                                     orb->response, sizeof(orb->response));
 495         kfree(orb);
 496
 497         return retval;
 498 }
 499
 500 static void
 501 complete_agent_reset_write(struct fw_card *card, int rcode,
 502                            void *payload, size_t length, void *data)
 503 {
 504         struct fw_transaction *t = data;
 505
 506         kfree(t);
 507 }
 508
 509 static int sbp2_agent_reset(struct fw_unit *unit)
 510 {
 511         struct fw_device *device = fw_device(unit->device.parent);
 512         struct sbp2_device *sd = unit->device.driver_data;
 513         struct fw_transaction *t;
 514         static u32 zero;
 515
 516         t = kzalloc(sizeof(*t), GFP_ATOMIC);
 517         if (t == NULL)
 518                 return -ENOMEM;
 519
 520         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 521                         sd->node_id, sd->generation, SCODE_400,
 522                         sd->command_block_agent_address + SBP2_AGENT_RESET,
 523                         &zero, sizeof(zero), complete_agent_reset_write, t);
 524
 525         return 0;
 526 }
 527
 528 static void sbp2_reconnect(struct work_struct *work);
 529 static struct scsi_host_template scsi_driver_template;
 530
 531 static void release_sbp2_device(struct kref *kref)
 532 {
 533         struct sbp2_device *sd = container_of(kref, struct sbp2_device, kref);
 534         struct Scsi_Host *host =
 535                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 536
 537         scsi_remove_host(host);
 538         sbp2_send_management_orb(sd->unit, sd->node_id, sd->generation,
 539                                  SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
 540         fw_core_remove_address_handler(&sd->address_handler);
 541         fw_notify("removed sbp2 unit %s\n", sd->unit->device.bus_id);
 542         put_device(&sd->unit->device);
 543         scsi_host_put(host);
 544 }
 545
 546 static void sbp2_login(struct work_struct *work)
 547 {
 548         struct sbp2_device *sd =
 549                 container_of(work, struct sbp2_device, work.work);
 550         struct Scsi_Host *host =
 551                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 552         struct fw_unit *unit = sd->unit;
 553         struct fw_device *device = fw_device(unit->device.parent);
 554         struct sbp2_login_response response;
 555         int generation, node_id, local_node_id, lun, retval;
 556
 557         /* FIXME: Make this work for multi-lun devices. */
 558         lun = 0;
 559
 560         generation    = device->card->generation;
 561         node_id       = device->node->node_id;
 562         local_node_id = device->card->local_node->node_id;
 563
 564         if (sbp2_send_management_orb(unit, node_id, generation,
 565                                      SBP2_LOGIN_REQUEST, lun, &response) < 0) {
 566                 if (sd->retries++ < 5) {
 567                         schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 568                 } else {
 569                         fw_error("failed to login to %s\n",
 570                                  unit->device.bus_id);
 571                         kref_put(&sd->kref, release_sbp2_device);
 572                 }
 573                 return;
 574         }
 575
 576         sd->generation   = generation;
 577         sd->node_id      = node_id;
 578         sd->address_high = local_node_id << 16;
 579
 580         /* Get command block agent offset and login id. */
 581         sd->command_block_agent_address =
 582                 ((u64) (response.command_block_agent.high & 0xffff) << 32) |
 583                 response.command_block_agent.low;
 584         sd->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
 585
 586         fw_notify("logged in to sbp2 unit %s (%d retries)\n",
 587                   unit->device.bus_id, sd->retries);
 588         fw_notify(" - management_agent_address:    0x%012llx\n",
 589                   (unsigned long long) sd->management_agent_address);
 590         fw_notify(" - command_block_agent_address: 0x%012llx\n",
 591                   (unsigned long long) sd->command_block_agent_address);
 592         fw_notify(" - status write address:        0x%012llx\n",
 593                   (unsigned long long) sd->address_handler.offset);
 594
 595 #if 0
 596         /* FIXME: The linux1394 sbp2 does this last step. */
 597         sbp2_set_busy_timeout(scsi_id);
 598 #endif
 599
 600         PREPARE_DELAYED_WORK(&sd->work, sbp2_reconnect);
 601         sbp2_agent_reset(unit);
 602
 603         /* FIXME: Loop over luns here. */
 604         lun = 0;
 605         retval = scsi_add_device(host, 0, 0, lun);
 606         if (retval < 0) {
 607                 sbp2_send_management_orb(unit, sd->node_id, sd->generation,
 608                                          SBP2_LOGOUT_REQUEST, sd->login_id,
 609                                          NULL);
 610                 /*
 611                  * Set this back to sbp2_login so we fall back and
 612                  * retry login on bus reset.
 613                  */
 614                 PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 615         }
 616         kref_put(&sd->kref, release_sbp2_device);
 617 }
 618
 619 static int sbp2_probe(struct device *dev)
 620 {
 621         struct fw_unit *unit = fw_unit(dev);
 622         struct fw_device *device = fw_device(unit->device.parent);
 623         struct sbp2_device *sd;
 624         struct fw_csr_iterator ci;
 625         struct Scsi_Host *host;
 626         int i, key, value, err;
 627         u32 model, firmware_revision;
 628
 629         err = -ENOMEM;
 630         host = scsi_host_alloc(&scsi_driver_template, sizeof(*sd));
 631         if (host == NULL)
 632                 goto fail;
 633
 634         sd = (struct sbp2_device *) host->hostdata;
 635         unit->device.driver_data = sd;
 636         sd->unit = unit;
 637         INIT_LIST_HEAD(&sd->orb_list);
 638         kref_init(&sd->kref);
 639
 640         sd->address_handler.length = 0x100;
 641         sd->address_handler.address_callback = sbp2_status_write;
 642         sd->address_handler.callback_data = sd;
 643
 644         err = fw_core_add_address_handler(&sd->address_handler,
 645                                           &fw_high_memory_region);
 646         if (err < 0)
 647                 goto fail_host;
 648
 649         err = fw_device_enable_phys_dma(device);
 650         if (err < 0)
 651                 goto fail_address_handler;
 652
 653         err = scsi_add_host(host, &unit->device);
 654         if (err < 0)
 655                 goto fail_address_handler;
 656
 657         /*
 658          * Scan unit directory to get management agent address,
 659          * firmware revison and model.  Initialize firmware_revision
 660          * and model to values that wont match anything in our table.
 661          */
 662         firmware_revision = 0xff000000;
 663         model = 0xff000000;
 664         fw_csr_iterator_init(&ci, unit->directory);
 665         while (fw_csr_iterator_next(&ci, &key, &value)) {
 666                 switch (key) {
 667                 case CSR_DEPENDENT_INFO | CSR_OFFSET:
 668                         sd->management_agent_address =
 669                                 0xfffff0000000ULL + 4 * value;
 670                         break;
 671                 case SBP2_FIRMWARE_REVISION:
 672                         firmware_revision = value;
 673                         break;
 674                 case CSR_MODEL:
 675                         model = value;
 676                         break;
 677                 }
 678         }
 679
 680         for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 681                 if (sbp2_workarounds_table[i].firmware_revision !=
 682                     (firmware_revision & 0xffffff00))
 683                         continue;
 684                 if (sbp2_workarounds_table[i].model != model &&
 685                     sbp2_workarounds_table[i].model != ~0)
 686                         continue;
 687                 sd->workarounds |= sbp2_workarounds_table[i].workarounds;
 688                 break;
 689         }
 690
 691         if (sd->workarounds)
 692                 fw_notify("Workarounds for node %s: 0x%x "
 693                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
 694                           unit->device.bus_id,
 695                           sd->workarounds, firmware_revision, model);
 696
 697         get_device(&unit->device);
 698
 699         /*
 700          * We schedule work to do the login so we can easily
 701          * reschedule retries. Always get the ref before scheduling
 702          * work.
 703          */
 704         INIT_DELAYED_WORK(&sd->work, sbp2_login);
 705         if (schedule_delayed_work(&sd->work, 0))
 706                 kref_get(&sd->kref);
 707
 708         return 0;
 709
 710  fail_address_handler:
 711         fw_core_remove_address_handler(&sd->address_handler);
 712  fail_host:
 713         scsi_host_put(host);
 714  fail:
 715         return err;
 716 }
 717
 718 static int sbp2_remove(struct device *dev)
 719 {
 720         struct fw_unit *unit = fw_unit(dev);
 721         struct sbp2_device *sd = unit->device.driver_data;
 722
 723         kref_put(&sd->kref, release_sbp2_device);
 724
 725         return 0;
 726 }
 727
 728 static void sbp2_reconnect(struct work_struct *work)
 729 {
 730         struct sbp2_device *sd =
 731                 container_of(work, struct sbp2_device, work.work);
 732         struct fw_unit *unit = sd->unit;
 733         struct fw_device *device = fw_device(unit->device.parent);
 734         int generation, node_id, local_node_id;
 735
 736         generation    = device->card->generation;
 737         node_id       = device->node->node_id;
 738         local_node_id = device->card->local_node->node_id;
 739
 740         if (sbp2_send_management_orb(unit, node_id, generation,
 741                                      SBP2_RECONNECT_REQUEST,
 742                                      sd->login_id, NULL) < 0) {
 743                 if (sd->retries++ >= 5) {
 744                         fw_error("failed to reconnect to %s\n",
 745                                  unit->device.bus_id);
 746                         /* Fall back and try to log in again. */
 747                         sd->retries = 0;
 748                         PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 749                 }
 750                 schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 751                 return;
 752         }
 753
 754         sd->generation   = generation;
 755         sd->node_id      = node_id;
 756         sd->address_high = local_node_id << 16;
 757
 758         fw_notify("reconnected to unit %s (%d retries)\n",
 759                   unit->device.bus_id, sd->retries);
 760         sbp2_agent_reset(unit);
 761         sbp2_cancel_orbs(unit);
 762         kref_put(&sd->kref, release_sbp2_device);
 763 }
 764
 765 static void sbp2_update(struct fw_unit *unit)
 766 {
 767         struct fw_device *device = fw_device(unit->device.parent);
 768         struct sbp2_device *sd = unit->device.driver_data;
 769
 770         sd->retries = 0;
 771         fw_device_enable_phys_dma(device);
 772         if (schedule_delayed_work(&sd->work, 0))
 773                 kref_get(&sd->kref);
 774 }
 775
 776 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 777 #define SBP2_SW_VERSION_ENTRY   0x00010483
 778
 779 static const struct fw_device_id sbp2_id_table[] = {
 780         {
 781                 .match_flags  = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
 782                 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
 783                 .version      = SBP2_SW_VERSION_ENTRY,
 784         },
 785         { }
 786 };
 787
 788 static struct fw_driver sbp2_driver = {
 789         .driver   = {
 790                 .owner  = THIS_MODULE,
 791                 .name   = sbp2_driver_name,
 792                 .bus    = &fw_bus_type,
 793                 .probe  = sbp2_probe,
 794                 .remove = sbp2_remove,
 795         },
 796         .update   = sbp2_update,
 797         .id_table = sbp2_id_table,
 798 };
 799
 800 static unsigned int
 801 sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
 802 {
 803         int sam_status;
 804
 805         sense_data[0] = 0x70;
 806         sense_data[1] = 0x0;
 807         sense_data[2] = sbp2_status[1];
 808         sense_data[3] = sbp2_status[4];
 809         sense_data[4] = sbp2_status[5];
 810         sense_data[5] = sbp2_status[6];
 811         sense_data[6] = sbp2_status[7];
 812         sense_data[7] = 10;
 813         sense_data[8] = sbp2_status[8];
 814         sense_data[9] = sbp2_status[9];
 815         sense_data[10] = sbp2_status[10];
 816         sense_data[11] = sbp2_status[11];
 817         sense_data[12] = sbp2_status[2];
 818         sense_data[13] = sbp2_status[3];
 819         sense_data[14] = sbp2_status[12];
 820         sense_data[15] = sbp2_status[13];
 821
 822         sam_status = sbp2_status[0] & 0x3f;
 823
 824         switch (sam_status) {
 825         case SAM_STAT_GOOD:
 826         case SAM_STAT_CHECK_CONDITION:
 827         case SAM_STAT_CONDITION_MET:
 828         case SAM_STAT_BUSY:
 829         case SAM_STAT_RESERVATION_CONFLICT:
 830         case SAM_STAT_COMMAND_TERMINATED:
 831                 return DID_OK << 16 | sam_status;
 832
 833         default:
 834                 return DID_ERROR << 16;
 835         }
 836 }
 837
 838 static void
 839 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 840 {
 841         struct sbp2_command_orb *orb =
 842                 container_of(base_orb, struct sbp2_command_orb, base);
 843         struct fw_unit *unit = orb->unit;
 844         struct fw_device *device = fw_device(unit->device.parent);
 845         struct scatterlist *sg;
 846         int result;
 847
 848         if (status != NULL) {
 849                 if (STATUS_GET_DEAD(*status))
 850                         sbp2_agent_reset(unit);
 851
 852                 switch (STATUS_GET_RESPONSE(*status)) {
 853                 case SBP2_STATUS_REQUEST_COMPLETE:
 854                         result = DID_OK << 16;
 855                         break;
 856                 case SBP2_STATUS_TRANSPORT_FAILURE:
 857                         result = DID_BUS_BUSY << 16;
 858                         break;
 859                 case SBP2_STATUS_ILLEGAL_REQUEST:
 860                 case SBP2_STATUS_VENDOR_DEPENDENT:
 861                 default:
 862                         result = DID_ERROR << 16;
 863                         break;
 864                 }
 865
 866                 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
 867                         result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
 868                                                            orb->cmd->sense_buffer);
 869         } else {
 870                 /*
 871                  * If the orb completes with status == NULL, something
 872                  * went wrong, typically a bus reset happened mid-orb
 873                  * or when sending the write (less likely).
 874                  */
 875                 result = DID_BUS_BUSY << 16;
 876         }
 877
 878         dma_unmap_single(device->card->device, orb->base.request_bus,
 879                          sizeof(orb->request), DMA_TO_DEVICE);
 880
 881         if (orb->cmd->use_sg > 0) {
 882                 sg = (struct scatterlist *)orb->cmd->request_buffer;
 883                 dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 884                              orb->cmd->sc_data_direction);
 885         }
 886
 887         if (orb->page_table_bus != 0)
 888                 dma_unmap_single(device->card->device, orb->page_table_bus,
 889                                  sizeof(orb->page_table_bus), DMA_TO_DEVICE);
 890
 891         orb->cmd->result = result;
 892         orb->done(orb->cmd);
 893         kfree(orb);
 894 }
 895
 896 static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
 897 {
 898         struct sbp2_device *sd =
 899                 (struct sbp2_device *)orb->cmd->device->host->hostdata;
 900         struct fw_unit *unit = sd->unit;
 901         struct fw_device *device = fw_device(unit->device.parent);
 902         struct scatterlist *sg;
 903         int sg_len, l, i, j, count;
 904         size_t size;
 905         dma_addr_t sg_addr;
 906
 907         sg = (struct scatterlist *)orb->cmd->request_buffer;
 908         count = dma_map_sg(device->card->device, sg, orb->cmd->use_sg,
 909                            orb->cmd->sc_data_direction);
 910         if (count == 0)
 911                 goto fail;
 912
 913         /*
 914          * Handle the special case where there is only one element in
 915          * the scatter list by converting it to an immediate block
 916          * request. This is also a workaround for broken devices such
 917          * as the second generation iPod which doesn't support page
 918          * tables.
 919          */
 920         if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
 921                 orb->request.data_descriptor.high = sd->address_high;
 922                 orb->request.data_descriptor.low  = sg_dma_address(sg);
 923                 orb->request.misc |=
 924                         COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
 925                 return 0;
 926         }
 927
 928         /*
 929          * Convert the scatterlist to an sbp2 page table.  If any
 930          * scatterlist entries are too big for sbp2, we split them as we
 931          * go.  Even if we ask the block I/O layer to not give us sg
 932          * elements larger than 65535 bytes, some IOMMUs may merge sg elements
 933          * during DMA mapping, and Linux currently doesn't prevent this.
 934          */
 935         for (i = 0, j = 0; i < count; i++) {
 936                 sg_len = sg_dma_len(sg + i);
 937                 sg_addr = sg_dma_address(sg + i);
 938                 while (sg_len) {
 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         size = sizeof(orb->page_table[0]) * j;
 949
 950         /*
 951          * The data_descriptor pointer is the one case where we need
 952          * to fill in the node ID part of the address.  All other
 953          * pointers assume that the data referenced reside on the
 954          * initiator (i.e. us), but data_descriptor can refer to data
 955          * on other nodes so we need to put our ID in descriptor.high.
 956          */
 957
 958         orb->page_table_bus =
 959                 dma_map_single(device->card->device, orb->page_table,
 960                                size, DMA_TO_DEVICE);
 961         if (dma_mapping_error(orb->page_table_bus))
 962                 goto fail_page_table;
 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         fw_memcpy_to_be32(orb->page_table, orb->page_table, size);
 970
 971         return 0;
 972
 973  fail_page_table:
 974         dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 975                      orb->cmd->sc_data_direction);
 976  fail:
 977         return -ENOMEM;
 978 }
 979
 980 /* SCSI stack integration */
 981
 982 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 983 {
 984         struct sbp2_device *sd =
 985                 (struct sbp2_device *)cmd->device->host->hostdata;
 986         struct fw_unit *unit = sd->unit;
 987         struct fw_device *device = fw_device(unit->device.parent);
 988         struct sbp2_command_orb *orb;
 989
 990         /*
 991          * Bidirectional commands are not yet implemented, and unknown
 992          * transfer direction not handled.
 993          */
 994         if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
 995                 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
 996                 cmd->result = DID_ERROR << 16;
 997                 done(cmd);
 998                 return 0;
 999         }
1000
1001         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
1002         if (orb == NULL) {
1003                 fw_notify("failed to alloc orb\n");
1004                 goto fail_alloc;
1005         }
1006
1007         /* Initialize rcode to something not RCODE_COMPLETE. */
1008         orb->base.rcode = -1;
1009         orb->base.request_bus =
1010                 dma_map_single(device->card->device, &orb->request,
1011                                sizeof(orb->request), DMA_TO_DEVICE);
1012         if (dma_mapping_error(orb->base.request_bus))
1013                 goto fail_mapping;
1014
1015         orb->unit = unit;
1016         orb->done = done;
1017         orb->cmd  = cmd;
1018
1019         orb->request.next.high   = SBP2_ORB_NULL;
1020         orb->request.next.low    = 0x0;
1021         /*
1022          * At speed 100 we can do 512 bytes per packet, at speed 200,
1023          * 1024 bytes per packet etc.  The SBP-2 max_payload field
1024          * specifies the max payload size as 2 ^ (max_payload + 2), so
1025          * if we set this to max_speed + 7, we get the right value.
1026          */
1027         orb->request.misc =
1028                 COMMAND_ORB_MAX_PAYLOAD(device->max_speed + 7) |
1029                 COMMAND_ORB_SPEED(device->max_speed) |
1030                 COMMAND_ORB_NOTIFY;
1031
1032         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1033                 orb->request.misc |=
1034                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA);
1035         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
1036                 orb->request.misc |=
1037                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
1038
1039         if (cmd->use_sg && sbp2_command_orb_map_scatterlist(orb) < 0)
1040                 goto fail_map_payload;
1041
1042         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
1043
1044         memset(orb->request.command_block,
1045                0, sizeof(orb->request.command_block));
1046         memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
1047
1048         orb->base.callback = complete_command_orb;
1049
1050         sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation,
1051                       sd->command_block_agent_address + SBP2_ORB_POINTER);
1052
1053         return 0;
1054
1055  fail_map_payload:
1056         dma_unmap_single(device->card->device, orb->base.request_bus,
1057                          sizeof(orb->request), DMA_TO_DEVICE);
1058  fail_mapping:
1059         kfree(orb);
1060  fail_alloc:
1061         return SCSI_MLQUEUE_HOST_BUSY;
1062 }
1063
1064 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1065 {
1066         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1067
1068         sdev->allow_restart = 1;
1069
1070         if (sd->workarounds & SBP2_WORKAROUND_INQUIRY_36)
1071                 sdev->inquiry_len = 36;
1072         return 0;
1073 }
1074
1075 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1076 {
1077         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1078         struct fw_unit *unit = sd->unit;
1079
1080         sdev->use_10_for_rw = 1;
1081
1082         if (sdev->type == TYPE_ROM)
1083                 sdev->use_10_for_ms = 1;
1084         if (sdev->type == TYPE_DISK &&
1085             sd->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
1086                 sdev->skip_ms_page_8 = 1;
1087         if (sd->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) {
1088                 fw_notify("setting fix_capacity for %s\n", unit->device.bus_id);
1089                 sdev->fix_capacity = 1;
1090         }
1091         if (sd->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
1092                 blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
1093         return 0;
1094 }
1095
1096 /*
1097  * Called by scsi stack when something has really gone wrong.  Usually
1098  * called when a command has timed-out for some reason.
1099  */
1100 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1101 {
1102         struct sbp2_device *sd =
1103                 (struct sbp2_device *)cmd->device->host->hostdata;
1104         struct fw_unit *unit = sd->unit;
1105
1106         fw_notify("sbp2_scsi_abort\n");
1107         sbp2_agent_reset(unit);
1108         sbp2_cancel_orbs(unit);
1109
1110         return SUCCESS;
1111 }
1112
1113 /*
1114  * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1115  * u64 EUI-64 : u24 directory_ID : u16 LUN  (all printed in hexadecimal)
1116  *
1117  * This is the concatenation of target port identifier and logical unit
1118  * identifier as per SAM-2...SAM-4 annex A.
1119  */
1120 static ssize_t
1121 sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1122                             char *buf)
1123 {
1124         struct scsi_device *sdev = to_scsi_device(dev);
1125         struct sbp2_device *sd;
1126         struct fw_unit *unit;
1127         struct fw_device *device;
1128         u32 directory_id;
1129         struct fw_csr_iterator ci;
1130         int key, value, lun;
1131
1132         if (!sdev)
1133                 return 0;
1134         sd = (struct sbp2_device *)sdev->host->hostdata;
1135         unit = sd->unit;
1136         device = fw_device(unit->device.parent);
1137
1138         /* implicit directory ID */
1139         directory_id = ((unit->directory - device->config_rom) * 4
1140                         + CSR_CONFIG_ROM) & 0xffffff;
1141
1142         /* explicit directory ID, overrides implicit ID if present */
1143         fw_csr_iterator_init(&ci, unit->directory);
1144         while (fw_csr_iterator_next(&ci, &key, &value))
1145                 if (key == CSR_DIRECTORY_ID) {
1146                         directory_id = value;
1147                         break;
1148                 }
1149
1150         /* FIXME: Make this work for multi-lun devices. */
1151         lun = 0;
1152
1153         return sprintf(buf, "%08x%08x:%06x:%04x\n",
1154                         device->config_rom[3], device->config_rom[4],
1155                         directory_id, lun);
1156 }
1157
1158 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1159
1160 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1161         &dev_attr_ieee1394_id,
1162         NULL
1163 };
1164
1165 static struct scsi_host_template scsi_driver_template = {
1166         .module                 = THIS_MODULE,
1167         .name                   = "SBP-2 IEEE-1394",
1168         .proc_name              = (char *)sbp2_driver_name,
1169         .queuecommand           = sbp2_scsi_queuecommand,
1170         .slave_alloc            = sbp2_scsi_slave_alloc,
1171         .slave_configure        = sbp2_scsi_slave_configure,
1172         .eh_abort_handler       = sbp2_scsi_abort,
1173         .this_id                = -1,
1174         .sg_tablesize           = SG_ALL,
1175         .use_clustering         = ENABLE_CLUSTERING,
1176         .cmd_per_lun            = 1,
1177         .can_queue              = 1,
1178         .sdev_attrs             = sbp2_scsi_sysfs_attrs,
1179 };
1180
1181 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1182 MODULE_DESCRIPTION("SCSI over IEEE1394");
1183 MODULE_LICENSE("GPL");
1184 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1185
1186 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1187 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1188 MODULE_ALIAS("sbp2");
1189 #endif
1190
1191 static int __init sbp2_init(void)
1192 {
1193         return driver_register(&sbp2_driver.driver);
1194 }
1195
1196 static void __exit sbp2_cleanup(void)
1197 {
1198         driver_unregister(&sbp2_driver.driver);
1199 }
1200
1201 module_init(sbp2_init);
1202 module_exit(sbp2_cleanup);