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   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/mod_devicetable.h>
  34 #include <linux/device.h>
  35 #include <linux/scatterlist.h>
  36 #include <linux/dma-mapping.h>
  37 #include <linux/blkdev.h>
  38 #include <linux/timer.h>
  39
  40 #include <scsi/scsi.h>
  41 #include <scsi/scsi_cmnd.h>
  42 #include <scsi/scsi_dbg.h>
  43 #include <scsi/scsi_device.h>
  44 #include <scsi/scsi_host.h>
  45
  46 #include "fw-transaction.h"
  47 #include "fw-topology.h"
  48 #include "fw-device.h"
  49
  50 /* I don't know why the SCSI stack doesn't define something like this... */
  51 typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
  52
  53 static const char sbp2_driver_name[] = "sbp2";
  54
  55 struct sbp2_device {
  56         struct kref kref;
  57         struct fw_unit *unit;
  58         struct fw_address_handler address_handler;
  59         struct list_head orb_list;
  60         u64 management_agent_address;
  61         u64 command_block_agent_address;
  62         u32 workarounds;
  63         int login_id;
  64
  65         /*
  66          * We cache these addresses and only update them once we've
  67          * logged in or reconnected to the sbp2 device.  That way, any
  68          * IO to the device will automatically fail and get retried if
  69          * it happens in a window where the device is not ready to
  70          * handle it (e.g. after a bus reset but before we reconnect).
  71          */
  72         int node_id;
  73         int address_high;
  74         int generation;
  75
  76         int retries;
  77         struct delayed_work work;
  78 };
  79
  80 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
  81 #define SBP2_MAX_SECTORS                255     /* Max sectors supported */
  82 #define SBP2_ORB_TIMEOUT                2000    /* Timeout in ms */
  83
  84 #define SBP2_ORB_NULL                   0x80000000
  85
  86 #define SBP2_DIRECTION_TO_MEDIA         0x0
  87 #define SBP2_DIRECTION_FROM_MEDIA       0x1
  88
  89 /* Unit directory keys */
  90 #define SBP2_COMMAND_SET_SPECIFIER      0x38
  91 #define SBP2_COMMAND_SET                0x39
  92 #define SBP2_COMMAND_SET_REVISION       0x3b
  93 #define SBP2_FIRMWARE_REVISION          0x3c
  94
  95 /* Flags for detected oddities and brokeness */
  96 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
  97 #define SBP2_WORKAROUND_INQUIRY_36      0x2
  98 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
  99 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
 100 #define SBP2_WORKAROUND_OVERRIDE        0x100
 101
 102 /* Management orb opcodes */
 103 #define SBP2_LOGIN_REQUEST              0x0
 104 #define SBP2_QUERY_LOGINS_REQUEST       0x1
 105 #define SBP2_RECONNECT_REQUEST          0x3
 106 #define SBP2_SET_PASSWORD_REQUEST       0x4
 107 #define SBP2_LOGOUT_REQUEST             0x7
 108 #define SBP2_ABORT_TASK_REQUEST         0xb
 109 #define SBP2_ABORT_TASK_SET             0xc
 110 #define SBP2_LOGICAL_UNIT_RESET         0xe
 111 #define SBP2_TARGET_RESET_REQUEST       0xf
 112
 113 /* Offsets for command block agent registers */
 114 #define SBP2_AGENT_STATE                0x00
 115 #define SBP2_AGENT_RESET                0x04
 116 #define SBP2_ORB_POINTER                0x08
 117 #define SBP2_DOORBELL                   0x10
 118 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 119
 120 /* Status write response codes */
 121 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 122 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 123 #define SBP2_STATUS_ILLEGAL_REQUEST     0x2
 124 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 125
 126 #define STATUS_GET_ORB_HIGH(v)          ((v).status & 0xffff)
 127 #define STATUS_GET_SBP_STATUS(v)        (((v).status >> 16) & 0xff)
 128 #define STATUS_GET_LEN(v)               (((v).status >> 24) & 0x07)
 129 #define STATUS_GET_DEAD(v)              (((v).status >> 27) & 0x01)
 130 #define STATUS_GET_RESPONSE(v)          (((v).status >> 28) & 0x03)
 131 #define STATUS_GET_SOURCE(v)            (((v).status >> 30) & 0x03)
 132 #define STATUS_GET_ORB_LOW(v)           ((v).orb_low)
 133 #define STATUS_GET_DATA(v)              ((v).data)
 134
 135 struct sbp2_status {
 136         u32 status;
 137         u32 orb_low;
 138         u8 data[24];
 139 };
 140
 141 struct sbp2_pointer {
 142         u32 high;
 143         u32 low;
 144 };
 145
 146 struct sbp2_orb {
 147         struct fw_transaction t;
 148         dma_addr_t request_bus;
 149         int rcode;
 150         struct sbp2_pointer pointer;
 151         void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
 152         struct list_head link;
 153 };
 154
 155 #define MANAGEMENT_ORB_LUN(v)                   ((v))
 156 #define MANAGEMENT_ORB_FUNCTION(v)              ((v) << 16)
 157 #define MANAGEMENT_ORB_RECONNECT(v)             ((v) << 20)
 158 #define MANAGEMENT_ORB_EXCLUSIVE                ((1) << 28)
 159 #define MANAGEMENT_ORB_REQUEST_FORMAT(v)        ((v) << 29)
 160 #define MANAGEMENT_ORB_NOTIFY                   ((1) << 31)
 161
 162 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v)       ((v))
 163 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v)       ((v) << 16)
 164
 165 struct sbp2_management_orb {
 166         struct sbp2_orb base;
 167         struct {
 168                 struct sbp2_pointer password;
 169                 struct sbp2_pointer response;
 170                 u32 misc;
 171                 u32 length;
 172                 struct sbp2_pointer status_fifo;
 173         } request;
 174         __be32 response[4];
 175         dma_addr_t response_bus;
 176         struct completion done;
 177         struct sbp2_status status;
 178 };
 179
 180 #define LOGIN_RESPONSE_GET_LOGIN_ID(v)  ((v).misc & 0xffff)
 181 #define LOGIN_RESPONSE_GET_LENGTH(v)    (((v).misc >> 16) & 0xffff)
 182
 183 struct sbp2_login_response {
 184         u32 misc;
 185         struct sbp2_pointer command_block_agent;
 186         u32 reconnect_hold;
 187 };
 188 #define COMMAND_ORB_DATA_SIZE(v)        ((v))
 189 #define COMMAND_ORB_PAGE_SIZE(v)        ((v) << 16)
 190 #define COMMAND_ORB_PAGE_TABLE_PRESENT  ((1) << 19)
 191 #define COMMAND_ORB_MAX_PAYLOAD(v)      ((v) << 20)
 192 #define COMMAND_ORB_SPEED(v)            ((v) << 24)
 193 #define COMMAND_ORB_DIRECTION(v)        ((v) << 27)
 194 #define COMMAND_ORB_REQUEST_FORMAT(v)   ((v) << 29)
 195 #define COMMAND_ORB_NOTIFY              ((1) << 31)
 196
 197 struct sbp2_command_orb {
 198         struct sbp2_orb base;
 199         struct {
 200                 struct sbp2_pointer next;
 201                 struct sbp2_pointer data_descriptor;
 202                 u32 misc;
 203                 u8 command_block[12];
 204         } request;
 205         struct scsi_cmnd *cmd;
 206         scsi_done_fn_t done;
 207         struct fw_unit *unit;
 208
 209         struct sbp2_pointer page_table[SG_ALL];
 210         dma_addr_t page_table_bus;
 211 };
 212
 213 /*
 214  * List of devices with known bugs.
 215  *
 216  * The firmware_revision field, masked with 0xffff00, is the best
 217  * indicator for the type of bridge chip of a device.  It yields a few
 218  * false positives but this did not break correctly behaving devices
 219  * so far.  We use ~0 as a wildcard, since the 24 bit values we get
 220  * from the config rom can never match that.
 221  */
 222 static const struct {
 223         u32 firmware_revision;
 224         u32 model;
 225         unsigned workarounds;
 226 } sbp2_workarounds_table[] = {
 227         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
 228                 .firmware_revision      = 0x002800,
 229                 .model                  = 0x001010,
 230                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
 231                                           SBP2_WORKAROUND_MODE_SENSE_8,
 232         },
 233         /* Initio bridges, actually only needed for some older ones */ {
 234                 .firmware_revision      = 0x000200,
 235                 .model                  = ~0,
 236                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36,
 237         },
 238         /* Symbios bridge */ {
 239                 .firmware_revision      = 0xa0b800,
 240                 .model                  = ~0,
 241                 .workarounds            = SBP2_WORKAROUND_128K_MAX_TRANS,
 242         },
 243
 244         /*
 245          * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
 246          * these iPods do not feature the read_capacity bug according
 247          * to one report.  Read_capacity behaviour as well as model_id
 248          * could change due to Apple-supplied firmware updates though.
 249          */
 250
 251         /* iPod 4th generation. */ {
 252                 .firmware_revision      = 0x0a2700,
 253                 .model                  = 0x000021,
 254                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 255         },
 256         /* iPod mini */ {
 257                 .firmware_revision      = 0x0a2700,
 258                 .model                  = 0x000023,
 259                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 260         },
 261         /* iPod Photo */ {
 262                 .firmware_revision      = 0x0a2700,
 263                 .model                  = 0x00007e,
 264                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 265         }
 266 };
 267
 268 static void
 269 sbp2_status_write(struct fw_card *card, struct fw_request *request,
 270                   int tcode, int destination, int source,
 271                   int generation, int speed,
 272                   unsigned long long offset,
 273                   void *payload, size_t length, void *callback_data)
 274 {
 275         struct sbp2_device *sd = callback_data;
 276         struct sbp2_orb *orb;
 277         struct sbp2_status status;
 278         size_t header_size;
 279         unsigned long flags;
 280
 281         if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
 282             length == 0 || length > sizeof(status)) {
 283                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 284                 return;
 285         }
 286
 287         header_size = min(length, 2 * sizeof(u32));
 288         fw_memcpy_from_be32(&status, payload, header_size);
 289         if (length > header_size)
 290                 memcpy(status.data, payload + 8, length - header_size);
 291         if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
 292                 fw_notify("non-orb related status write, not handled\n");
 293                 fw_send_response(card, request, RCODE_COMPLETE);
 294                 return;
 295         }
 296
 297         /* Lookup the orb corresponding to this status write. */
 298         spin_lock_irqsave(&card->lock, flags);
 299         list_for_each_entry(orb, &sd->orb_list, link) {
 300                 if (STATUS_GET_ORB_HIGH(status) == 0 &&
 301                     STATUS_GET_ORB_LOW(status) == orb->request_bus &&
 302                     orb->rcode == RCODE_COMPLETE) {
 303                         list_del(&orb->link);
 304                         break;
 305                 }
 306         }
 307         spin_unlock_irqrestore(&card->lock, flags);
 308
 309         if (&orb->link != &sd->orb_list)
 310                 orb->callback(orb, &status);
 311         else
 312                 fw_error("status write for unknown orb\n");
 313
 314         fw_send_response(card, request, RCODE_COMPLETE);
 315 }
 316
 317 static void
 318 complete_transaction(struct fw_card *card, int rcode,
 319                      void *payload, size_t length, void *data)
 320 {
 321         struct sbp2_orb *orb = data;
 322         unsigned long flags;
 323
 324         orb->rcode = rcode;
 325         if (rcode != RCODE_COMPLETE) {
 326                 spin_lock_irqsave(&card->lock, flags);
 327                 list_del(&orb->link);
 328                 spin_unlock_irqrestore(&card->lock, flags);
 329                 orb->callback(orb, NULL);
 330         }
 331 }
 332
 333 static void
 334 sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit,
 335               int node_id, int generation, u64 offset)
 336 {
 337         struct fw_device *device = fw_device(unit->device.parent);
 338         struct sbp2_device *sd = unit->device.driver_data;
 339         unsigned long flags;
 340
 341         orb->pointer.high = 0;
 342         orb->pointer.low = orb->request_bus;
 343         fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer));
 344
 345         spin_lock_irqsave(&device->card->lock, flags);
 346         list_add_tail(&orb->link, &sd->orb_list);
 347         spin_unlock_irqrestore(&device->card->lock, flags);
 348
 349         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
 350                         node_id, generation, device->max_speed, offset,
 351                         &orb->pointer, sizeof(orb->pointer),
 352                         complete_transaction, orb);
 353 }
 354
 355 static int sbp2_cancel_orbs(struct fw_unit *unit)
 356 {
 357         struct fw_device *device = fw_device(unit->device.parent);
 358         struct sbp2_device *sd = unit->device.driver_data;
 359         struct sbp2_orb *orb, *next;
 360         struct list_head list;
 361         unsigned long flags;
 362         int retval = -ENOENT;
 363
 364         INIT_LIST_HEAD(&list);
 365         spin_lock_irqsave(&device->card->lock, flags);
 366         list_splice_init(&sd->orb_list, &list);
 367         spin_unlock_irqrestore(&device->card->lock, flags);
 368
 369         list_for_each_entry_safe(orb, next, &list, link) {
 370                 retval = 0;
 371                 if (fw_cancel_transaction(device->card, &orb->t) == 0)
 372                         continue;
 373
 374                 orb->rcode = RCODE_CANCELLED;
 375                 orb->callback(orb, NULL);
 376         }
 377
 378         return retval;
 379 }
 380
 381 static void
 382 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 383 {
 384         struct sbp2_management_orb *orb =
 385             (struct sbp2_management_orb *)base_orb;
 386
 387         if (status)
 388                 memcpy(&orb->status, status, sizeof(*status));
 389         complete(&orb->done);
 390 }
 391
 392 static int
 393 sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
 394                          int function, int lun, void *response)
 395 {
 396         struct fw_device *device = fw_device(unit->device.parent);
 397         struct sbp2_device *sd = unit->device.driver_data;
 398         struct sbp2_management_orb *orb;
 399         int retval = -ENOMEM;
 400
 401         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 402         if (orb == NULL)
 403                 return -ENOMEM;
 404
 405         /*
 406          * The sbp2 device is going to send a block read request to
 407          * read out the request from host memory, so map it for dma.
 408          */
 409         orb->base.request_bus =
 410                 dma_map_single(device->card->device, &orb->request,
 411                                sizeof(orb->request), DMA_TO_DEVICE);
 412         if (dma_mapping_error(orb->base.request_bus))
 413                 goto out;
 414
 415         orb->response_bus =
 416                 dma_map_single(device->card->device, &orb->response,
 417                                sizeof(orb->response), DMA_FROM_DEVICE);
 418         if (dma_mapping_error(orb->response_bus))
 419                 goto out;
 420
 421         orb->request.response.high    = 0;
 422         orb->request.response.low     = orb->response_bus;
 423
 424         orb->request.misc =
 425                 MANAGEMENT_ORB_NOTIFY |
 426                 MANAGEMENT_ORB_FUNCTION(function) |
 427                 MANAGEMENT_ORB_LUN(lun);
 428         orb->request.length =
 429                 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response));
 430
 431         orb->request.status_fifo.high = sd->address_handler.offset >> 32;
 432         orb->request.status_fifo.low  = sd->address_handler.offset;
 433
 434         /*
 435          * FIXME: Yeah, ok this isn't elegant, we hardwire exclusive
 436          * login and 1 second reconnect time.  The reconnect setting
 437          * is probably fine, but the exclusive login should be an option.
 438          */
 439         if (function == SBP2_LOGIN_REQUEST) {
 440                 orb->request.misc |=
 441                         MANAGEMENT_ORB_EXCLUSIVE |
 442                         MANAGEMENT_ORB_RECONNECT(0);
 443         }
 444
 445         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
 446
 447         init_completion(&orb->done);
 448         orb->base.callback = complete_management_orb;
 449
 450         sbp2_send_orb(&orb->base, unit,
 451                       node_id, generation, sd->management_agent_address);
 452
 453         wait_for_completion_timeout(&orb->done,
 454                                     msecs_to_jiffies(SBP2_ORB_TIMEOUT));
 455
 456         retval = -EIO;
 457         if (sbp2_cancel_orbs(unit) == 0) {
 458                 fw_error("orb reply timed out, rcode=0x%02x\n",
 459                          orb->base.rcode);
 460                 goto out;
 461         }
 462
 463         if (orb->base.rcode != RCODE_COMPLETE) {
 464                 fw_error("management write failed, rcode 0x%02x\n",
 465                          orb->base.rcode);
 466                 goto out;
 467         }
 468
 469         if (STATUS_GET_RESPONSE(orb->status) != 0 ||
 470             STATUS_GET_SBP_STATUS(orb->status) != 0) {
 471                 fw_error("error status: %d:%d\n",
 472                          STATUS_GET_RESPONSE(orb->status),
 473                          STATUS_GET_SBP_STATUS(orb->status));
 474                 goto out;
 475         }
 476
 477         retval = 0;
 478  out:
 479         dma_unmap_single(device->card->device, orb->base.request_bus,
 480                          sizeof(orb->request), DMA_TO_DEVICE);
 481         dma_unmap_single(device->card->device, orb->response_bus,
 482                          sizeof(orb->response), DMA_FROM_DEVICE);
 483
 484         if (response)
 485                 fw_memcpy_from_be32(response,
 486                                     orb->response, sizeof(orb->response));
 487         kfree(orb);
 488
 489         return retval;
 490 }
 491
 492 static void
 493 complete_agent_reset_write(struct fw_card *card, int rcode,
 494                            void *payload, size_t length, void *data)
 495 {
 496         struct fw_transaction *t = data;
 497
 498         kfree(t);
 499 }
 500
 501 static int sbp2_agent_reset(struct fw_unit *unit)
 502 {
 503         struct fw_device *device = fw_device(unit->device.parent);
 504         struct sbp2_device *sd = unit->device.driver_data;
 505         struct fw_transaction *t;
 506         static u32 zero;
 507
 508         t = kzalloc(sizeof(*t), GFP_ATOMIC);
 509         if (t == NULL)
 510                 return -ENOMEM;
 511
 512         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 513                         sd->node_id, sd->generation, SCODE_400,
 514                         sd->command_block_agent_address + SBP2_AGENT_RESET,
 515                         &zero, sizeof(zero), complete_agent_reset_write, t);
 516
 517         return 0;
 518 }
 519
 520 static void sbp2_reconnect(struct work_struct *work);
 521 static struct scsi_host_template scsi_driver_template;
 522
 523 static void release_sbp2_device(struct kref *kref)
 524 {
 525         struct sbp2_device *sd = container_of(kref, struct sbp2_device, kref);
 526         struct Scsi_Host *host =
 527                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 528
 529         scsi_remove_host(host);
 530         sbp2_send_management_orb(sd->unit, sd->node_id, sd->generation,
 531                                  SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
 532         fw_core_remove_address_handler(&sd->address_handler);
 533         fw_notify("removed sbp2 unit %s\n", sd->unit->device.bus_id);
 534         put_device(&sd->unit->device);
 535         scsi_host_put(host);
 536 }
 537
 538 static void sbp2_login(struct work_struct *work)
 539 {
 540         struct sbp2_device *sd =
 541                 container_of(work, struct sbp2_device, work.work);
 542         struct Scsi_Host *host =
 543                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 544         struct fw_unit *unit = sd->unit;
 545         struct fw_device *device = fw_device(unit->device.parent);
 546         struct sbp2_login_response response;
 547         int generation, node_id, local_node_id, lun, retval;
 548
 549         /* FIXME: Make this work for multi-lun devices. */
 550         lun = 0;
 551
 552         generation    = device->card->generation;
 553         node_id       = device->node->node_id;
 554         local_node_id = device->card->local_node->node_id;
 555
 556         if (sbp2_send_management_orb(unit, node_id, generation,
 557                                      SBP2_LOGIN_REQUEST, lun, &response) < 0) {
 558                 if (sd->retries++ < 5) {
 559                         schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 560                 } else {
 561                         fw_error("failed to login to %s\n",
 562                                  unit->device.bus_id);
 563                         kref_put(&sd->kref, release_sbp2_device);
 564                 }
 565                 return;
 566         }
 567
 568         sd->generation   = generation;
 569         sd->node_id      = node_id;
 570         sd->address_high = local_node_id << 16;
 571
 572         /* Get command block agent offset and login id. */
 573         sd->command_block_agent_address =
 574                 ((u64) (response.command_block_agent.high & 0xffff) << 32) |
 575                 response.command_block_agent.low;
 576         sd->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
 577
 578         fw_notify("logged in to sbp2 unit %s (%d retries)\n",
 579                   unit->device.bus_id, sd->retries);
 580         fw_notify(" - management_agent_address:    0x%012llx\n",
 581                   (unsigned long long) sd->management_agent_address);
 582         fw_notify(" - command_block_agent_address: 0x%012llx\n",
 583                   (unsigned long long) sd->command_block_agent_address);
 584         fw_notify(" - status write address:        0x%012llx\n",
 585                   (unsigned long long) sd->address_handler.offset);
 586
 587 #if 0
 588         /* FIXME: The linux1394 sbp2 does this last step. */
 589         sbp2_set_busy_timeout(scsi_id);
 590 #endif
 591
 592         PREPARE_DELAYED_WORK(&sd->work, sbp2_reconnect);
 593         sbp2_agent_reset(unit);
 594
 595         /* FIXME: Loop over luns here. */
 596         lun = 0;
 597         retval = scsi_add_device(host, 0, 0, lun);
 598         if (retval < 0) {
 599                 sbp2_send_management_orb(unit, sd->node_id, sd->generation,
 600                                          SBP2_LOGOUT_REQUEST, sd->login_id,
 601                                          NULL);
 602                 /*
 603                  * Set this back to sbp2_login so we fall back and
 604                  * retry login on bus reset.
 605                  */
 606                 PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 607         }
 608         kref_put(&sd->kref, release_sbp2_device);
 609 }
 610
 611 static int sbp2_probe(struct device *dev)
 612 {
 613         struct fw_unit *unit = fw_unit(dev);
 614         struct fw_device *device = fw_device(unit->device.parent);
 615         struct sbp2_device *sd;
 616         struct fw_csr_iterator ci;
 617         struct Scsi_Host *host;
 618         int i, key, value, err;
 619         u32 model, firmware_revision;
 620
 621         err = -ENOMEM;
 622         host = scsi_host_alloc(&scsi_driver_template, sizeof(*sd));
 623         if (host == NULL)
 624                 goto fail;
 625
 626         sd = (struct sbp2_device *) host->hostdata;
 627         unit->device.driver_data = sd;
 628         sd->unit = unit;
 629         INIT_LIST_HEAD(&sd->orb_list);
 630         kref_init(&sd->kref);
 631
 632         sd->address_handler.length = 0x100;
 633         sd->address_handler.address_callback = sbp2_status_write;
 634         sd->address_handler.callback_data = sd;
 635
 636         err = fw_core_add_address_handler(&sd->address_handler,
 637                                           &fw_high_memory_region);
 638         if (err < 0)
 639                 goto fail_host;
 640
 641         err = fw_device_enable_phys_dma(device);
 642         if (err < 0)
 643                 goto fail_address_handler;
 644
 645         err = scsi_add_host(host, &unit->device);
 646         if (err < 0)
 647                 goto fail_address_handler;
 648
 649         /*
 650          * Scan unit directory to get management agent address,
 651          * firmware revison and model.  Initialize firmware_revision
 652          * and model to values that wont match anything in our table.
 653          */
 654         firmware_revision = 0xff000000;
 655         model = 0xff000000;
 656         fw_csr_iterator_init(&ci, unit->directory);
 657         while (fw_csr_iterator_next(&ci, &key, &value)) {
 658                 switch (key) {
 659                 case CSR_DEPENDENT_INFO | CSR_OFFSET:
 660                         sd->management_agent_address =
 661                                 0xfffff0000000ULL + 4 * value;
 662                         break;
 663                 case SBP2_FIRMWARE_REVISION:
 664                         firmware_revision = value;
 665                         break;
 666                 case CSR_MODEL:
 667                         model = value;
 668                         break;
 669                 }
 670         }
 671
 672         for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 673                 if (sbp2_workarounds_table[i].firmware_revision !=
 674                     (firmware_revision & 0xffffff00))
 675                         continue;
 676                 if (sbp2_workarounds_table[i].model != model &&
 677                     sbp2_workarounds_table[i].model != ~0)
 678                         continue;
 679                 sd->workarounds |= sbp2_workarounds_table[i].workarounds;
 680                 break;
 681         }
 682
 683         if (sd->workarounds)
 684                 fw_notify("Workarounds for node %s: 0x%x "
 685                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
 686                           unit->device.bus_id,
 687                           sd->workarounds, firmware_revision, model);
 688
 689         get_device(&unit->device);
 690
 691         /*
 692          * We schedule work to do the login so we can easily
 693          * reschedule retries. Always get the ref before scheduling
 694          * work.
 695          */
 696         INIT_DELAYED_WORK(&sd->work, sbp2_login);
 697         if (schedule_delayed_work(&sd->work, 0))
 698                 kref_get(&sd->kref);
 699
 700         return 0;
 701
 702  fail_address_handler:
 703         fw_core_remove_address_handler(&sd->address_handler);
 704  fail_host:
 705         scsi_host_put(host);
 706  fail:
 707         return err;
 708 }
 709
 710 static int sbp2_remove(struct device *dev)
 711 {
 712         struct fw_unit *unit = fw_unit(dev);
 713         struct sbp2_device *sd = unit->device.driver_data;
 714
 715         kref_put(&sd->kref, release_sbp2_device);
 716
 717         return 0;
 718 }
 719
 720 static void sbp2_reconnect(struct work_struct *work)
 721 {
 722         struct sbp2_device *sd =
 723                 container_of(work, struct sbp2_device, work.work);
 724         struct fw_unit *unit = sd->unit;
 725         struct fw_device *device = fw_device(unit->device.parent);
 726         int generation, node_id, local_node_id;
 727
 728         generation    = device->card->generation;
 729         node_id       = device->node->node_id;
 730         local_node_id = device->card->local_node->node_id;
 731
 732         if (sbp2_send_management_orb(unit, node_id, generation,
 733                                      SBP2_RECONNECT_REQUEST,
 734                                      sd->login_id, NULL) < 0) {
 735                 if (sd->retries++ >= 5) {
 736                         fw_error("failed to reconnect to %s\n",
 737                                  unit->device.bus_id);
 738                         /* Fall back and try to log in again. */
 739                         sd->retries = 0;
 740                         PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 741                 }
 742                 schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 743                 return;
 744         }
 745
 746         sd->generation   = generation;
 747         sd->node_id      = node_id;
 748         sd->address_high = local_node_id << 16;
 749
 750         fw_notify("reconnected to unit %s (%d retries)\n",
 751                   unit->device.bus_id, sd->retries);
 752         sbp2_agent_reset(unit);
 753         sbp2_cancel_orbs(unit);
 754         kref_put(&sd->kref, release_sbp2_device);
 755 }
 756
 757 static void sbp2_update(struct fw_unit *unit)
 758 {
 759         struct fw_device *device = fw_device(unit->device.parent);
 760         struct sbp2_device *sd = unit->device.driver_data;
 761
 762         sd->retries = 0;
 763         fw_device_enable_phys_dma(device);
 764         if (schedule_delayed_work(&sd->work, 0))
 765                 kref_get(&sd->kref);
 766 }
 767
 768 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 769 #define SBP2_SW_VERSION_ENTRY   0x00010483
 770
 771 static const struct fw_device_id sbp2_id_table[] = {
 772         {
 773                 .match_flags  = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
 774                 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
 775                 .version      = SBP2_SW_VERSION_ENTRY,
 776         },
 777         { }
 778 };
 779
 780 static struct fw_driver sbp2_driver = {
 781         .driver   = {
 782                 .owner  = THIS_MODULE,
 783                 .name   = sbp2_driver_name,
 784                 .bus    = &fw_bus_type,
 785                 .probe  = sbp2_probe,
 786                 .remove = sbp2_remove,
 787         },
 788         .update   = sbp2_update,
 789         .id_table = sbp2_id_table,
 790 };
 791
 792 static unsigned int
 793 sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
 794 {
 795         int sam_status;
 796
 797         sense_data[0] = 0x70;
 798         sense_data[1] = 0x0;
 799         sense_data[2] = sbp2_status[1];
 800         sense_data[3] = sbp2_status[4];
 801         sense_data[4] = sbp2_status[5];
 802         sense_data[5] = sbp2_status[6];
 803         sense_data[6] = sbp2_status[7];
 804         sense_data[7] = 10;
 805         sense_data[8] = sbp2_status[8];
 806         sense_data[9] = sbp2_status[9];
 807         sense_data[10] = sbp2_status[10];
 808         sense_data[11] = sbp2_status[11];
 809         sense_data[12] = sbp2_status[2];
 810         sense_data[13] = sbp2_status[3];
 811         sense_data[14] = sbp2_status[12];
 812         sense_data[15] = sbp2_status[13];
 813
 814         sam_status = sbp2_status[0] & 0x3f;
 815
 816         switch (sam_status) {
 817         case SAM_STAT_GOOD:
 818         case SAM_STAT_CHECK_CONDITION:
 819         case SAM_STAT_CONDITION_MET:
 820         case SAM_STAT_BUSY:
 821         case SAM_STAT_RESERVATION_CONFLICT:
 822         case SAM_STAT_COMMAND_TERMINATED:
 823                 return DID_OK << 16 | sam_status;
 824
 825         default:
 826                 return DID_ERROR << 16;
 827         }
 828 }
 829
 830 static void
 831 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 832 {
 833         struct sbp2_command_orb *orb = (struct sbp2_command_orb *)base_orb;
 834         struct fw_unit *unit = orb->unit;
 835         struct fw_device *device = fw_device(unit->device.parent);
 836         struct scatterlist *sg;
 837         int result;
 838
 839         if (status != NULL) {
 840                 if (STATUS_GET_DEAD(*status))
 841                         sbp2_agent_reset(unit);
 842
 843                 switch (STATUS_GET_RESPONSE(*status)) {
 844                 case SBP2_STATUS_REQUEST_COMPLETE:
 845                         result = DID_OK << 16;
 846                         break;
 847                 case SBP2_STATUS_TRANSPORT_FAILURE:
 848                         result = DID_BUS_BUSY << 16;
 849                         break;
 850                 case SBP2_STATUS_ILLEGAL_REQUEST:
 851                 case SBP2_STATUS_VENDOR_DEPENDENT:
 852                 default:
 853                         result = DID_ERROR << 16;
 854                         break;
 855                 }
 856
 857                 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
 858                         result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
 859                                                            orb->cmd->sense_buffer);
 860         } else {
 861                 /*
 862                  * If the orb completes with status == NULL, something
 863                  * went wrong, typically a bus reset happened mid-orb
 864                  * or when sending the write (less likely).
 865                  */
 866                 result = DID_BUS_BUSY << 16;
 867         }
 868
 869         dma_unmap_single(device->card->device, orb->base.request_bus,
 870                          sizeof(orb->request), DMA_TO_DEVICE);
 871
 872         if (orb->cmd->use_sg > 0) {
 873                 sg = (struct scatterlist *)orb->cmd->request_buffer;
 874                 dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 875                              orb->cmd->sc_data_direction);
 876         }
 877
 878         if (orb->page_table_bus != 0)
 879                 dma_unmap_single(device->card->device, orb->page_table_bus,
 880                                  sizeof(orb->page_table_bus), DMA_TO_DEVICE);
 881
 882         orb->cmd->result = result;
 883         orb->done(orb->cmd);
 884         kfree(orb);
 885 }
 886
 887 static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
 888 {
 889         struct sbp2_device *sd =
 890                 (struct sbp2_device *)orb->cmd->device->host->hostdata;
 891         struct fw_unit *unit = sd->unit;
 892         struct fw_device *device = fw_device(unit->device.parent);
 893         struct scatterlist *sg;
 894         int sg_len, l, i, j, count;
 895         size_t size;
 896         dma_addr_t sg_addr;
 897
 898         sg = (struct scatterlist *)orb->cmd->request_buffer;
 899         count = dma_map_sg(device->card->device, sg, orb->cmd->use_sg,
 900                            orb->cmd->sc_data_direction);
 901         if (count == 0)
 902                 goto fail;
 903
 904         /*
 905          * Handle the special case where there is only one element in
 906          * the scatter list by converting it to an immediate block
 907          * request. This is also a workaround for broken devices such
 908          * as the second generation iPod which doesn't support page
 909          * tables.
 910          */
 911         if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
 912                 orb->request.data_descriptor.high = sd->address_high;
 913                 orb->request.data_descriptor.low  = sg_dma_address(sg);
 914                 orb->request.misc |=
 915                         COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
 916                 return 0;
 917         }
 918
 919         /*
 920          * Convert the scatterlist to an sbp2 page table.  If any
 921          * scatterlist entries are too big for sbp2, we split them as we
 922          * go.  Even if we ask the block I/O layer to not give us sg
 923          * elements larger than 65535 bytes, some IOMMUs may merge sg elements
 924          * during DMA mapping, and Linux currently doesn't prevent this.
 925          */
 926         for (i = 0, j = 0; i < count; i++) {
 927                 sg_len = sg_dma_len(sg + i);
 928                 sg_addr = sg_dma_address(sg + i);
 929                 while (sg_len) {
 930                         l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
 931                         orb->page_table[j].low = sg_addr;
 932                         orb->page_table[j].high = (l << 16);
 933                         sg_addr += l;
 934                         sg_len -= l;
 935                         j++;
 936                 }
 937         }
 938
 939         size = sizeof(orb->page_table[0]) * j;
 940
 941         /*
 942          * The data_descriptor pointer is the one case where we need
 943          * to fill in the node ID part of the address.  All other
 944          * pointers assume that the data referenced reside on the
 945          * initiator (i.e. us), but data_descriptor can refer to data
 946          * on other nodes so we need to put our ID in descriptor.high.
 947          */
 948
 949         orb->page_table_bus =
 950                 dma_map_single(device->card->device, orb->page_table,
 951                                size, DMA_TO_DEVICE);
 952         if (dma_mapping_error(orb->page_table_bus))
 953                 goto fail_page_table;
 954         orb->request.data_descriptor.high = sd->address_high;
 955         orb->request.data_descriptor.low  = orb->page_table_bus;
 956         orb->request.misc |=
 957                 COMMAND_ORB_PAGE_TABLE_PRESENT |
 958                 COMMAND_ORB_DATA_SIZE(j);
 959
 960         fw_memcpy_to_be32(orb->page_table, orb->page_table, size);
 961
 962         return 0;
 963
 964  fail_page_table:
 965         dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 966                      orb->cmd->sc_data_direction);
 967  fail:
 968         return -ENOMEM;
 969 }
 970
 971 /* SCSI stack integration */
 972
 973 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 974 {
 975         struct sbp2_device *sd =
 976                 (struct sbp2_device *)cmd->device->host->hostdata;
 977         struct fw_unit *unit = sd->unit;
 978         struct fw_device *device = fw_device(unit->device.parent);
 979         struct sbp2_command_orb *orb;
 980
 981         /*
 982          * Bidirectional commands are not yet implemented, and unknown
 983          * transfer direction not handled.
 984          */
 985         if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
 986                 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
 987                 cmd->result = DID_ERROR << 16;
 988                 done(cmd);
 989                 return 0;
 990         }
 991
 992         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 993         if (orb == NULL) {
 994                 fw_notify("failed to alloc orb\n");
 995                 goto fail_alloc;
 996         }
 997
 998         /* Initialize rcode to something not RCODE_COMPLETE. */
 999         orb->base.rcode = -1;
1000         orb->base.request_bus =
1001                 dma_map_single(device->card->device, &orb->request,
1002                                sizeof(orb->request), DMA_TO_DEVICE);
1003         if (dma_mapping_error(orb->base.request_bus))
1004                 goto fail_mapping;
1005
1006         orb->unit = unit;
1007         orb->done = done;
1008         orb->cmd  = cmd;
1009
1010         orb->request.next.high   = SBP2_ORB_NULL;
1011         orb->request.next.low    = 0x0;
1012         /*
1013          * At speed 100 we can do 512 bytes per packet, at speed 200,
1014          * 1024 bytes per packet etc.  The SBP-2 max_payload field
1015          * specifies the max payload size as 2 ^ (max_payload + 2), so
1016          * if we set this to max_speed + 7, we get the right value.
1017          */
1018         orb->request.misc =
1019                 COMMAND_ORB_MAX_PAYLOAD(device->max_speed + 7) |
1020                 COMMAND_ORB_SPEED(device->max_speed) |
1021                 COMMAND_ORB_NOTIFY;
1022
1023         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1024                 orb->request.misc |=
1025                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA);
1026         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
1027                 orb->request.misc |=
1028                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
1029
1030         if (cmd->use_sg && sbp2_command_orb_map_scatterlist(orb) < 0)
1031                 goto fail_map_payload;
1032
1033         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
1034
1035         memset(orb->request.command_block,
1036                0, sizeof(orb->request.command_block));
1037         memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
1038
1039         orb->base.callback = complete_command_orb;
1040
1041         sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation,
1042                       sd->command_block_agent_address + SBP2_ORB_POINTER);
1043
1044         return 0;
1045
1046  fail_map_payload:
1047         dma_unmap_single(device->card->device, orb->base.request_bus,
1048                          sizeof(orb->request), DMA_TO_DEVICE);
1049  fail_mapping:
1050         kfree(orb);
1051  fail_alloc:
1052         return SCSI_MLQUEUE_HOST_BUSY;
1053 }
1054
1055 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1056 {
1057         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1058
1059         sdev->allow_restart = 1;
1060
1061         if (sd->workarounds & SBP2_WORKAROUND_INQUIRY_36)
1062                 sdev->inquiry_len = 36;
1063         return 0;
1064 }
1065
1066 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1067 {
1068         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1069         struct fw_unit *unit = sd->unit;
1070
1071         sdev->use_10_for_rw = 1;
1072
1073         if (sdev->type == TYPE_ROM)
1074                 sdev->use_10_for_ms = 1;
1075         if (sdev->type == TYPE_DISK &&
1076             sd->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
1077                 sdev->skip_ms_page_8 = 1;
1078         if (sd->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) {
1079                 fw_notify("setting fix_capacity for %s\n", unit->device.bus_id);
1080                 sdev->fix_capacity = 1;
1081         }
1082         if (sd->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
1083                 blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
1084         return 0;
1085 }
1086
1087 /*
1088  * Called by scsi stack when something has really gone wrong.  Usually
1089  * called when a command has timed-out for some reason.
1090  */
1091 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1092 {
1093         struct sbp2_device *sd =
1094                 (struct sbp2_device *)cmd->device->host->hostdata;
1095         struct fw_unit *unit = sd->unit;
1096
1097         fw_notify("sbp2_scsi_abort\n");
1098         sbp2_agent_reset(unit);
1099         sbp2_cancel_orbs(unit);
1100
1101         return SUCCESS;
1102 }
1103
1104 /*
1105  * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1106  * u64 EUI-64 : u24 directory_ID : u16 LUN  (all printed in hexadecimal)
1107  *
1108  * This is the concatenation of target port identifier and logical unit
1109  * identifier as per SAM-2...SAM-4 annex A.
1110  */
1111 static ssize_t
1112 sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1113                             char *buf)
1114 {
1115         struct scsi_device *sdev = to_scsi_device(dev);
1116         struct sbp2_device *sd;
1117         struct fw_unit *unit;
1118         struct fw_device *device;
1119         u32 directory_id;
1120         struct fw_csr_iterator ci;
1121         int key, value, lun;
1122
1123         if (!sdev)
1124                 return 0;
1125         sd = (struct sbp2_device *)sdev->host->hostdata;
1126         unit = sd->unit;
1127         device = fw_device(unit->device.parent);
1128
1129         /* implicit directory ID */
1130         directory_id = ((unit->directory - device->config_rom) * 4
1131                         + CSR_CONFIG_ROM) & 0xffffff;
1132
1133         /* explicit directory ID, overrides implicit ID if present */
1134         fw_csr_iterator_init(&ci, unit->directory);
1135         while (fw_csr_iterator_next(&ci, &key, &value))
1136                 if (key == CSR_DIRECTORY_ID) {
1137                         directory_id = value;
1138                         break;
1139                 }
1140
1141         /* FIXME: Make this work for multi-lun devices. */
1142         lun = 0;
1143
1144         return sprintf(buf, "%08x%08x:%06x:%04x\n",
1145                         device->config_rom[3], device->config_rom[4],
1146                         directory_id, lun);
1147 }
1148
1149 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1150
1151 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1152         &dev_attr_ieee1394_id,
1153         NULL
1154 };
1155
1156 static struct scsi_host_template scsi_driver_template = {
1157         .module                 = THIS_MODULE,
1158         .name                   = "SBP-2 IEEE-1394",
1159         .proc_name              = (char *)sbp2_driver_name,
1160         .queuecommand           = sbp2_scsi_queuecommand,
1161         .slave_alloc            = sbp2_scsi_slave_alloc,
1162         .slave_configure        = sbp2_scsi_slave_configure,
1163         .eh_abort_handler       = sbp2_scsi_abort,
1164         .this_id                = -1,
1165         .sg_tablesize           = SG_ALL,
1166         .use_clustering         = ENABLE_CLUSTERING,
1167         .cmd_per_lun            = 1,
1168         .can_queue              = 1,
1169         .sdev_attrs             = sbp2_scsi_sysfs_attrs,
1170 };
1171
1172 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1173 MODULE_DESCRIPTION("SCSI over IEEE1394");
1174 MODULE_LICENSE("GPL");
1175 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1176
1177 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1178 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1179 MODULE_ALIAS("sbp2");
1180 #endif
1181
1182 static int __init sbp2_init(void)
1183 {
1184         return driver_register(&sbp2_driver.driver);
1185 }
1186
1187 static void __exit sbp2_cleanup(void)
1188 {
1189         driver_unregister(&sbp2_driver.driver);
1190 }
1191
1192 module_init(sbp2_init);
1193 module_exit(sbp2_cleanup);