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   1 /*                                              -*- c-basic-offset: 8 -*-
   2  * fw-sbp2.c -- SBP2 driver (SCSI over IEEE1394)
   3  *
   4  * Copyright (C) 2005-2006  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 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/mod_devicetable.h>
  24 #include <linux/device.h>
  25 #include <linux/scatterlist.h>
  26 #include <linux/dma-mapping.h>
  27
  28 #include <scsi/scsi.h>
  29 #include <scsi/scsi_cmnd.h>
  30 #include <scsi/scsi_dbg.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_host.h>
  33
  34 #include "fw-transaction.h"
  35 #include "fw-topology.h"
  36 #include "fw-device.h"
  37
  38 /* I don't know why the SCSI stack doesn't define something like this... */
  39 typedef void (*scsi_done_fn_t) (struct scsi_cmnd *);
  40
  41 static const char sbp2_driver_name[] = "sbp2";
  42
  43 struct sbp2_device {
  44         struct fw_unit *unit;
  45         struct fw_address_handler address_handler;
  46         struct list_head orb_list;
  47         u64 management_agent_address;
  48         u64 command_block_agent_address;
  49         u32 workarounds;
  50         int login_id;
  51
  52         /* We cache these addresses and only update them once we've
  53          * logged in or reconnected to the sbp2 device.  That way, any
  54          * IO to the device will automatically fail and get retried if
  55          * it happens in a window where the device is not ready to
  56          * handle it (e.g. after a bus reset but before we reconnect). */
  57         int node_id;
  58         int address_high;
  59         int generation;
  60
  61         struct work_struct work;
  62         struct Scsi_Host *scsi_host;
  63 };
  64
  65 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
  66 #define SBP2_MAX_SECTORS                255     /* Max sectors supported */
  67
  68 #define SBP2_ORB_NULL                   0x80000000
  69
  70 #define SBP2_DIRECTION_TO_MEDIA         0x0
  71 #define SBP2_DIRECTION_FROM_MEDIA       0x1
  72
  73 /* Unit directory keys */
  74 #define SBP2_COMMAND_SET_SPECIFIER      0x38
  75 #define SBP2_COMMAND_SET                0x39
  76 #define SBP2_COMMAND_SET_REVISION       0x3b
  77 #define SBP2_FIRMWARE_REVISION          0x3c
  78
  79 /* Flags for detected oddities and brokeness */
  80 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
  81 #define SBP2_WORKAROUND_INQUIRY_36      0x2
  82 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
  83 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
  84 #define SBP2_WORKAROUND_OVERRIDE        0x100
  85
  86 /* Management orb opcodes */
  87 #define SBP2_LOGIN_REQUEST              0x0
  88 #define SBP2_QUERY_LOGINS_REQUEST       0x1
  89 #define SBP2_RECONNECT_REQUEST          0x3
  90 #define SBP2_SET_PASSWORD_REQUEST       0x4
  91 #define SBP2_LOGOUT_REQUEST             0x7
  92 #define SBP2_ABORT_TASK_REQUEST         0xb
  93 #define SBP2_ABORT_TASK_SET             0xc
  94 #define SBP2_LOGICAL_UNIT_RESET         0xe
  95 #define SBP2_TARGET_RESET_REQUEST       0xf
  96
  97 /* Offsets for command block agent registers */
  98 #define SBP2_AGENT_STATE                0x00
  99 #define SBP2_AGENT_RESET                0x04
 100 #define SBP2_ORB_POINTER                0x08
 101 #define SBP2_DOORBELL                   0x10
 102 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 103
 104 /* Status write response codes */
 105 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 106 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 107 #define SBP2_STATUS_ILLEGAL_REQUEST     0x2
 108 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 109
 110 #define status_get_orb_high(v)          ((v).status & 0xffff)
 111 #define status_get_sbp_status(v)        (((v).status >> 16) & 0xff)
 112 #define status_get_len(v)               (((v).status >> 24) & 0x07)
 113 #define status_get_dead(v)              (((v).status >> 27) & 0x01)
 114 #define status_get_response(v)          (((v).status >> 28) & 0x03)
 115 #define status_get_source(v)            (((v).status >> 30) & 0x03)
 116 #define status_get_orb_low(v)           ((v).orb_low)
 117 #define status_get_data(v)              ((v).data)
 118
 119 struct sbp2_status {
 120         u32 status;
 121         u32 orb_low;
 122         u8 data[24];
 123 };
 124
 125 struct sbp2_pointer {
 126         u32 high;
 127         u32 low;
 128 };
 129
 130 struct sbp2_orb {
 131         struct fw_transaction t;
 132         dma_addr_t request_bus;
 133         int rcode;
 134         struct sbp2_pointer pointer;
 135         void (*callback) (struct sbp2_orb * orb, struct sbp2_status * status);
 136         struct list_head link;
 137 };
 138
 139 #define management_orb_lun(v)                   ((v))
 140 #define management_orb_function(v)              ((v) << 16)
 141 #define management_orb_reconnect(v)             ((v) << 20)
 142 #define management_orb_exclusive                ((1) << 28)
 143 #define management_orb_request_format(v)        ((v) << 29)
 144 #define management_orb_notify                   ((1) << 31)
 145
 146 #define management_orb_response_length(v)       ((v))
 147 #define management_orb_password_length(v)       ((v) << 16)
 148
 149 struct sbp2_management_orb {
 150         struct sbp2_orb base;
 151         struct {
 152                 struct sbp2_pointer password;
 153                 struct sbp2_pointer response;
 154                 u32 misc;
 155                 u32 length;
 156                 struct sbp2_pointer status_fifo;
 157         } request;
 158         __be32 response[4];
 159         dma_addr_t response_bus;
 160         struct completion done;
 161         struct sbp2_status status;
 162 };
 163
 164 #define login_response_get_login_id(v)  ((v).misc & 0xffff)
 165 #define login_response_get_length(v)    (((v).misc >> 16) & 0xffff)
 166
 167 struct sbp2_login_response {
 168         u32 misc;
 169         struct sbp2_pointer command_block_agent;
 170         u32 reconnect_hold;
 171 };
 172
 173 #define command_orb_data_size(v)        ((v))
 174 #define command_orb_page_size(v)        ((v) << 16)
 175 #define command_orb_page_table_present  ((1) << 19)
 176 #define command_orb_max_payload(v)      ((v) << 20)
 177 #define command_orb_speed(v)            ((v) << 24)
 178 #define command_orb_direction(v)        ((v) << 27)
 179 #define command_orb_request_format(v)   ((v) << 29)
 180 #define command_orb_notify              ((1) << 31)
 181
 182 struct sbp2_command_orb {
 183         struct sbp2_orb base;
 184         struct {
 185                 struct sbp2_pointer next;
 186                 struct sbp2_pointer data_descriptor;
 187                 u32 misc;
 188                 u8 command_block[12];
 189         } request;
 190         struct scsi_cmnd *cmd;
 191         scsi_done_fn_t done;
 192         struct fw_unit *unit;
 193
 194         struct sbp2_pointer page_table[SG_ALL];
 195         dma_addr_t page_table_bus;
 196         dma_addr_t request_buffer_bus;
 197 };
 198
 199 /*
 200  * List of devices with known bugs.
 201  *
 202  * The firmware_revision field, masked with 0xffff00, is the best
 203  * indicator for the type of bridge chip of a device.  It yields a few
 204  * false positives but this did not break correctly behaving devices
 205  * so far.  We use ~0 as a wildcard, since the 24 bit values we get
 206  * from the config rom can never match that.
 207  */
 208 static const struct {
 209         u32 firmware_revision;
 210         u32 model;
 211         unsigned workarounds;
 212 } sbp2_workarounds_table[] = {
 213         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
 214                 .firmware_revision      = 0x002800,
 215                 .model                  = 0x001010,
 216                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
 217                                           SBP2_WORKAROUND_MODE_SENSE_8,
 218         },
 219         /* Initio bridges, actually only needed for some older ones */ {
 220                 .firmware_revision      = 0x000200,
 221                 .model                  = ~0,
 222                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36,
 223         },
 224         /* Symbios bridge */ {
 225                 .firmware_revision      = 0xa0b800,
 226                 .model                  = ~0,
 227                 .workarounds            = SBP2_WORKAROUND_128K_MAX_TRANS,
 228         },
 229         /* There are iPods (2nd gen, 3rd gen) with model_id == 0, but
 230          * these iPods do not feature the read_capacity bug according
 231          * to one report.  Read_capacity behaviour as well as model_id
 232          * could change due to Apple-supplied firmware updates though. */
 233         /* iPod 4th generation. */ {
 234                 .firmware_revision      = 0x0a2700,
 235                 .model                  = 0x000021,
 236                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 237         },
 238         /* iPod mini */ {
 239                 .firmware_revision      = 0x0a2700,
 240                 .model                  = 0x000023,
 241                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 242         },
 243         /* iPod Photo */ {
 244                 .firmware_revision      = 0x0a2700,
 245                 .model                  = 0x00007e,
 246                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 247         }
 248 };
 249
 250 static void
 251 sbp2_status_write(struct fw_card *card, struct fw_request *request,
 252                   int tcode, int destination, int source,
 253                   int generation, int speed,
 254                   unsigned long long offset,
 255                   void *payload, size_t length, void *callback_data)
 256 {
 257         struct sbp2_device *sd = callback_data;
 258         struct sbp2_orb *orb;
 259         struct sbp2_status status;
 260         size_t header_size;
 261         unsigned long flags;
 262
 263         if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
 264             length == 0 || length > sizeof status) {
 265                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 266                 return;
 267         }
 268
 269         header_size = min(length, 2 * sizeof(u32));
 270         fw_memcpy_from_be32(&status, payload, header_size);
 271         if (length > header_size)
 272                 memcpy(status.data, payload + 8, length - header_size);
 273         if (status_get_source(status) == 2 || status_get_source(status) == 3) {
 274                 fw_notify("non-orb related status write, not handled\n");
 275                 fw_send_response(card, request, RCODE_COMPLETE);
 276                 return;
 277         }
 278
 279         /* Lookup the orb corresponding to this status write. */
 280         spin_lock_irqsave(&card->lock, flags);
 281         list_for_each_entry(orb, &sd->orb_list, link) {
 282                 if (status_get_orb_high(status) == 0 &&
 283                     status_get_orb_low(status) == orb->request_bus) {
 284                         list_del(&orb->link);
 285                         break;
 286                 }
 287         }
 288         spin_unlock_irqrestore(&card->lock, flags);
 289
 290         if (&orb->link != &sd->orb_list)
 291                 orb->callback(orb, &status);
 292         else
 293                 fw_error("status write for unknown orb\n");
 294
 295         fw_send_response(card, request, RCODE_COMPLETE);
 296 }
 297
 298 static void
 299 complete_transaction(struct fw_card *card, int rcode,
 300                      void *payload, size_t length, void *data)
 301 {
 302         struct sbp2_orb *orb = data;
 303         unsigned long flags;
 304
 305         orb->rcode = rcode;
 306         if (rcode != RCODE_COMPLETE) {
 307                 spin_lock_irqsave(&card->lock, flags);
 308                 list_del(&orb->link);
 309                 spin_unlock_irqrestore(&card->lock, flags);
 310                 orb->callback(orb, NULL);
 311         }
 312 }
 313
 314 static void
 315 sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit,
 316               int node_id, int generation, u64 offset)
 317 {
 318         struct fw_device *device = fw_device(unit->device.parent);
 319         struct sbp2_device *sd = unit->device.driver_data;
 320         unsigned long flags;
 321
 322         orb->pointer.high = 0;
 323         orb->pointer.low = orb->request_bus;
 324         fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof orb->pointer);
 325
 326         spin_lock_irqsave(&device->card->lock, flags);
 327         list_add_tail(&orb->link, &sd->orb_list);
 328         spin_unlock_irqrestore(&device->card->lock, flags);
 329
 330         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
 331                         node_id, generation,
 332                         device->node->max_speed, offset,
 333                         &orb->pointer, sizeof orb->pointer,
 334                         complete_transaction, orb);
 335 }
 336
 337 static void sbp2_cancel_orbs(struct fw_unit *unit)
 338 {
 339         struct fw_device *device = fw_device(unit->device.parent);
 340         struct sbp2_device *sd = unit->device.driver_data;
 341         struct sbp2_orb *orb, *next;
 342         struct list_head list;
 343         unsigned long flags;
 344
 345         INIT_LIST_HEAD(&list);
 346         spin_lock_irqsave(&device->card->lock, flags);
 347         list_splice_init(&sd->orb_list, &list);
 348         spin_unlock_irqrestore(&device->card->lock, flags);
 349
 350         list_for_each_entry_safe(orb, next, &list, link) {
 351                 orb->rcode = RCODE_CANCELLED;
 352                 orb->callback(orb, NULL);
 353         }
 354 }
 355
 356 static void
 357 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 358 {
 359         struct sbp2_management_orb *orb =
 360             (struct sbp2_management_orb *)base_orb;
 361
 362         if (status)
 363                 memcpy(&orb->status, status, sizeof *status);
 364         complete(&orb->done);
 365 }
 366
 367 static int
 368 sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
 369                          int function, int lun, void *response)
 370 {
 371         struct fw_device *device = fw_device(unit->device.parent);
 372         struct sbp2_device *sd = unit->device.driver_data;
 373         struct sbp2_management_orb *orb;
 374         unsigned long timeout;
 375         int retval = -ENOMEM;
 376
 377         orb = kzalloc(sizeof *orb, GFP_ATOMIC);
 378         if (orb == NULL)
 379                 return -ENOMEM;
 380
 381         /* The sbp2 device is going to send a block read request to
 382          * read out the request from host memory, so map it for
 383          * dma. */
 384         orb->base.request_bus =
 385                 dma_map_single(device->card->device, &orb->request,
 386                                sizeof orb->request, DMA_TO_DEVICE);
 387         if (orb->base.request_bus == 0)
 388                 goto out;
 389
 390         orb->response_bus =
 391                 dma_map_single(device->card->device, &orb->response,
 392                                sizeof orb->response, DMA_FROM_DEVICE);
 393         if (orb->response_bus == 0)
 394                 goto out;
 395
 396         orb->request.response.high    = 0;
 397         orb->request.response.low     = orb->response_bus;
 398
 399         orb->request.misc =
 400                 management_orb_notify |
 401                 management_orb_function(function) |
 402                 management_orb_lun(lun);
 403         orb->request.length =
 404                 management_orb_response_length(sizeof orb->response);
 405
 406         orb->request.status_fifo.high = sd->address_handler.offset >> 32;
 407         orb->request.status_fifo.low  = sd->address_handler.offset;
 408
 409         /* FIXME: Yeah, ok this isn't elegant, we hardwire exclusive
 410          * login and 1 second reconnect time.  The reconnect setting
 411          * is probably fine, but the exclusive login should be an
 412          * option. */
 413         if (function == SBP2_LOGIN_REQUEST) {
 414                 orb->request.misc |=
 415                         management_orb_exclusive |
 416                         management_orb_reconnect(0);
 417         }
 418
 419         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof orb->request);
 420
 421         init_completion(&orb->done);
 422         orb->base.callback = complete_management_orb;
 423         sbp2_send_orb(&orb->base, unit,
 424                       node_id, generation, sd->management_agent_address);
 425
 426         timeout = wait_for_completion_timeout(&orb->done, 10 * HZ);
 427
 428         /* FIXME: Handle bus reset race here. */
 429
 430         retval = -EIO;
 431         if (orb->base.rcode != RCODE_COMPLETE) {
 432                 fw_error("management write failed, rcode 0x%02x\n",
 433                          orb->base.rcode);
 434                 goto out;
 435         }
 436
 437         if (timeout == 0) {
 438                 fw_error("orb reply timed out, rcode=0x%02x\n",
 439                          orb->base.rcode);
 440                 goto out;
 441         }
 442
 443         if (status_get_response(orb->status) != 0 ||
 444             status_get_sbp_status(orb->status) != 0) {
 445                 fw_error("error status: %d:%d\n",
 446                          status_get_response(orb->status),
 447                          status_get_sbp_status(orb->status));
 448                 goto out;
 449         }
 450
 451         retval = 0;
 452  out:
 453         dma_unmap_single(device->card->device, orb->base.request_bus,
 454                          sizeof orb->request, DMA_TO_DEVICE);
 455         dma_unmap_single(device->card->device, orb->response_bus,
 456                          sizeof orb->response, DMA_FROM_DEVICE);
 457
 458         if (response)
 459                 fw_memcpy_from_be32(response,
 460                                     orb->response, sizeof orb->response);
 461         kfree(orb);
 462
 463         return retval;
 464 }
 465
 466 static void
 467 complete_agent_reset_write(struct fw_card *card, int rcode,
 468                            void *payload, size_t length, void *data)
 469 {
 470         struct fw_transaction *t = data;
 471
 472         fw_notify("agent reset write rcode=%d\n", rcode);
 473         kfree(t);
 474 }
 475
 476 static int sbp2_agent_reset(struct fw_unit *unit)
 477 {
 478         struct fw_device *device = fw_device(unit->device.parent);
 479         struct sbp2_device *sd = unit->device.driver_data;
 480         struct fw_transaction *t;
 481         static u32 zero;
 482
 483         t = kzalloc(sizeof *t, GFP_ATOMIC);
 484         if (t == NULL)
 485                 return -ENOMEM;
 486
 487         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 488                         sd->node_id, sd->generation, SCODE_400,
 489                         sd->command_block_agent_address + SBP2_AGENT_RESET,
 490                         &zero, sizeof zero, complete_agent_reset_write, t);
 491
 492         return 0;
 493 }
 494
 495 static int add_scsi_devices(struct fw_unit *unit);
 496 static void remove_scsi_devices(struct fw_unit *unit);
 497
 498 static int sbp2_probe(struct device *dev)
 499 {
 500         struct fw_unit *unit = fw_unit(dev);
 501         struct fw_device *device = fw_device(unit->device.parent);
 502         struct sbp2_device *sd;
 503         struct fw_csr_iterator ci;
 504         int i, key, value, lun, retval;
 505         int node_id, generation, local_node_id;
 506         struct sbp2_login_response response;
 507         u32 model, firmware_revision;
 508
 509         sd = kzalloc(sizeof *sd, GFP_KERNEL);
 510         if (sd == NULL)
 511                 return -ENOMEM;
 512
 513         unit->device.driver_data = sd;
 514         sd->unit = unit;
 515         INIT_LIST_HEAD(&sd->orb_list);
 516
 517         sd->address_handler.length = 0x100;
 518         sd->address_handler.address_callback = sbp2_status_write;
 519         sd->address_handler.callback_data = sd;
 520
 521         if (fw_core_add_address_handler(&sd->address_handler,
 522                                         &fw_high_memory_region) < 0) {
 523                 kfree(sd);
 524                 return -EBUSY;
 525         }
 526
 527         if (fw_device_enable_phys_dma(device) < 0) {
 528                 fw_core_remove_address_handler(&sd->address_handler);
 529                 kfree(sd);
 530                 return -EBUSY;
 531         }
 532
 533         /* Scan unit directory to get management agent address,
 534          * firmware revison and model.  Initialize firmware_revision
 535          * and model to values that wont match anything in our table. */
 536         firmware_revision = 0xff000000;
 537         model = 0xff000000;
 538         fw_csr_iterator_init(&ci, unit->directory);
 539         while (fw_csr_iterator_next(&ci, &key, &value)) {
 540                 switch (key) {
 541                 case CSR_DEPENDENT_INFO | CSR_OFFSET:
 542                         sd->management_agent_address =
 543                                 0xfffff0000000ULL + 4 * value;
 544                         break;
 545                 case SBP2_FIRMWARE_REVISION:
 546                         firmware_revision = value;
 547                         break;
 548                 case CSR_MODEL:
 549                         model = value;
 550                         break;
 551                 }
 552         }
 553
 554         for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 555                 if (sbp2_workarounds_table[i].firmware_revision !=
 556                     (firmware_revision & 0xffffff00))
 557                         continue;
 558                 if (sbp2_workarounds_table[i].model != model &&
 559                     sbp2_workarounds_table[i].model != ~0)
 560                         continue;
 561                 sd->workarounds |= sbp2_workarounds_table[i].workarounds;
 562                 break;
 563         }
 564
 565         if (sd->workarounds)
 566                 fw_notify("Workarounds for node %s: 0x%x "
 567                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
 568                           unit->device.bus_id,
 569                           sd->workarounds, firmware_revision, model);
 570
 571         /* FIXME: Make this work for multi-lun devices. */
 572         lun = 0;
 573
 574         generation    = device->card->generation;
 575         node_id       = device->node->node_id;
 576         local_node_id = device->card->local_node->node_id;
 577
 578         /* FIXME: We should probably do this from a keventd callback
 579          * and handle retries by rescheduling the work. */
 580         if (sbp2_send_management_orb(unit, node_id, generation,
 581                                      SBP2_LOGIN_REQUEST, lun, &response) < 0) {
 582                 fw_core_remove_address_handler(&sd->address_handler);
 583                 kfree(sd);
 584                 return -EBUSY;
 585         }
 586
 587         sd->generation   = generation;
 588         sd->node_id      = node_id;
 589         sd->address_high = local_node_id << 16;
 590
 591         /* Get command block agent offset and login id. */
 592         sd->command_block_agent_address =
 593                 ((u64) response.command_block_agent.high << 32) |
 594                 response.command_block_agent.low;
 595         sd->login_id = login_response_get_login_id(response);
 596
 597         fw_notify("logged in to sbp2 unit %s\n", unit->device.bus_id);
 598         fw_notify(" - management_agent_address: 0x%012llx\n",
 599                   (unsigned long long) sd->management_agent_address);
 600         fw_notify(" - command_block_agent_address: 0x%012llx\n",
 601                   (unsigned long long) sd->command_block_agent_address);
 602         fw_notify(" - status write address: 0x%012llx\n",
 603                   (unsigned long long) sd->address_handler.offset);
 604
 605 #if 0
 606         /* FIXME: The linux1394 sbp2 does this last step. */
 607         sbp2_set_busy_timeout(scsi_id);
 608 #endif
 609
 610         sbp2_agent_reset(unit);
 611
 612         retval = add_scsi_devices(unit);
 613         if (retval < 0) {
 614                 sbp2_send_management_orb(unit, sd->node_id, sd->generation,
 615                                          SBP2_LOGOUT_REQUEST, sd->login_id,
 616                                          NULL);
 617                 fw_core_remove_address_handler(&sd->address_handler);
 618                 kfree(sd);
 619                 return retval;
 620         }
 621
 622         return 0;
 623 }
 624
 625 static int sbp2_remove(struct device *dev)
 626 {
 627         struct fw_unit *unit = fw_unit(dev);
 628         struct sbp2_device *sd = unit->device.driver_data;
 629
 630         sbp2_send_management_orb(unit, sd->node_id, sd->generation,
 631                                  SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
 632
 633         remove_scsi_devices(unit);
 634
 635         fw_core_remove_address_handler(&sd->address_handler);
 636         kfree(sd);
 637
 638         fw_notify("removed sbp2 unit %s\n", dev->bus_id);
 639
 640         return 0;
 641 }
 642
 643 static void sbp2_reconnect(struct work_struct *work)
 644 {
 645         struct sbp2_device *sd = container_of(work, struct sbp2_device, work);
 646         struct fw_unit *unit = sd->unit;
 647         struct fw_device *device = fw_device(unit->device.parent);
 648         int generation, node_id, local_node_id;
 649
 650         fw_notify("in sbp2_reconnect, reconnecting to unit %s\n",
 651                   unit->device.bus_id);
 652
 653         generation    = device->card->generation;
 654         node_id       = device->node->node_id;
 655         local_node_id = device->card->local_node->node_id;
 656
 657         sbp2_send_management_orb(unit, node_id, generation,
 658                                  SBP2_RECONNECT_REQUEST, sd->login_id, NULL);
 659
 660         /* FIXME: handle reconnect failures. */
 661
 662         sbp2_cancel_orbs(unit);
 663
 664         sd->generation   = generation;
 665         sd->node_id      = node_id;
 666         sd->address_high = local_node_id << 16;
 667 }
 668
 669 static void sbp2_update(struct fw_unit *unit)
 670 {
 671         struct fw_device *device = fw_device(unit->device.parent);
 672         struct sbp2_device *sd = unit->device.driver_data;
 673
 674         fw_device_enable_phys_dma(device);
 675
 676         INIT_WORK(&sd->work, sbp2_reconnect);
 677         schedule_work(&sd->work);
 678 }
 679
 680 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 681 #define SBP2_SW_VERSION_ENTRY   0x00010483
 682
 683 static const struct fw_device_id sbp2_id_table[] = {
 684         {
 685                 .match_flags  = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
 686                 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
 687                 .version      = SBP2_SW_VERSION_ENTRY,
 688         },
 689         { }
 690 };
 691
 692 static struct fw_driver sbp2_driver = {
 693         .driver   = {
 694                 .owner  = THIS_MODULE,
 695                 .name   = sbp2_driver_name,
 696                 .bus    = &fw_bus_type,
 697                 .probe  = sbp2_probe,
 698                 .remove = sbp2_remove,
 699         },
 700         .update   = sbp2_update,
 701         .id_table = sbp2_id_table,
 702 };
 703
 704 static unsigned int sbp2_status_to_sense_data(u8 * sbp2_status, u8 * sense_data)
 705 {
 706         sense_data[0] = 0x70;
 707         sense_data[1] = 0x0;
 708         sense_data[2] = sbp2_status[1];
 709         sense_data[3] = sbp2_status[4];
 710         sense_data[4] = sbp2_status[5];
 711         sense_data[5] = sbp2_status[6];
 712         sense_data[6] = sbp2_status[7];
 713         sense_data[7] = 10;
 714         sense_data[8] = sbp2_status[8];
 715         sense_data[9] = sbp2_status[9];
 716         sense_data[10] = sbp2_status[10];
 717         sense_data[11] = sbp2_status[11];
 718         sense_data[12] = sbp2_status[2];
 719         sense_data[13] = sbp2_status[3];
 720         sense_data[14] = sbp2_status[12];
 721         sense_data[15] = sbp2_status[13];
 722
 723         switch (sbp2_status[0] & 0x3f) {
 724         case SAM_STAT_GOOD:
 725                 return DID_OK;
 726
 727         case SAM_STAT_CHECK_CONDITION:
 728                 /* return CHECK_CONDITION << 1 | DID_OK << 16; */
 729                 return DID_OK;
 730
 731         case SAM_STAT_BUSY:
 732                 return DID_BUS_BUSY;
 733
 734         case SAM_STAT_CONDITION_MET:
 735         case SAM_STAT_RESERVATION_CONFLICT:
 736         case SAM_STAT_COMMAND_TERMINATED:
 737         default:
 738                 return DID_ERROR;
 739         }
 740 }
 741
 742 static void
 743 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 744 {
 745         struct sbp2_command_orb *orb = (struct sbp2_command_orb *)base_orb;
 746         struct fw_unit *unit = orb->unit;
 747         struct fw_device *device = fw_device(unit->device.parent);
 748         struct scatterlist *sg;
 749         int result;
 750
 751         if (status != NULL) {
 752                 if (status_get_dead(*status)) {
 753                         fw_notify("agent died, issuing agent reset\n");
 754                         sbp2_agent_reset(unit);
 755                 }
 756
 757                 switch (status_get_response(*status)) {
 758                 case SBP2_STATUS_REQUEST_COMPLETE:
 759                         result = DID_OK;
 760                         break;
 761                 case SBP2_STATUS_TRANSPORT_FAILURE:
 762                         result = DID_BUS_BUSY;
 763                         break;
 764                 case SBP2_STATUS_ILLEGAL_REQUEST:
 765                 case SBP2_STATUS_VENDOR_DEPENDENT:
 766                 default:
 767                         result = DID_ERROR;
 768                         break;
 769                 }
 770
 771                 if (result == DID_OK && status_get_len(*status) > 1)
 772                         result = sbp2_status_to_sense_data(status_get_data(*status),
 773                                                            orb->cmd->sense_buffer);
 774         } else {
 775                 /* If the orb completes with status == NULL, something
 776                  * went wrong, typically a bus reset happened mid-orb
 777                  * or when sending the write (less likely). */
 778                 fw_notify("no command orb status, rcode=%d\n",
 779                           orb->base.rcode);
 780                 result = DID_ERROR;
 781         }
 782
 783         dma_unmap_single(device->card->device, orb->base.request_bus,
 784                          sizeof orb->request, DMA_TO_DEVICE);
 785
 786         if (orb->cmd->use_sg > 0) {
 787                 sg = (struct scatterlist *)orb->cmd->request_buffer;
 788                 dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 789                              orb->cmd->sc_data_direction);
 790         }
 791
 792         if (orb->page_table_bus != 0)
 793                 dma_unmap_single(device->card->device, orb->page_table_bus,
 794                                  sizeof orb->page_table_bus, DMA_TO_DEVICE);
 795
 796         if (orb->request_buffer_bus != 0)
 797                 dma_unmap_single(device->card->device, orb->request_buffer_bus,
 798                                  sizeof orb->request_buffer_bus,
 799                                  DMA_FROM_DEVICE);
 800
 801         orb->cmd->result = result << 16;
 802         orb->done(orb->cmd);
 803
 804         kfree(orb);
 805 }
 806
 807 static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
 808 {
 809         struct fw_unit *unit =
 810                 (struct fw_unit *)orb->cmd->device->host->hostdata[0];
 811         struct fw_device *device = fw_device(unit->device.parent);
 812         struct sbp2_device *sd = unit->device.driver_data;
 813         struct scatterlist *sg;
 814         int sg_len, l, i, j, count;
 815         size_t size;
 816         dma_addr_t sg_addr;
 817
 818         sg = (struct scatterlist *)orb->cmd->request_buffer;
 819         count = dma_map_sg(device->card->device, sg, orb->cmd->use_sg,
 820                            orb->cmd->sc_data_direction);
 821
 822         /* Handle the special case where there is only one element in
 823          * the scatter list by converting it to an immediate block
 824          * request. This is also a workaround for broken devices such
 825          * as the second generation iPod which doesn't support page
 826          * tables. */
 827         if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
 828                 orb->request.data_descriptor.high = sd->address_high;
 829                 orb->request.data_descriptor.low  = sg_dma_address(sg);
 830                 orb->request.misc |=
 831                         command_orb_data_size(sg_dma_len(sg));
 832                 return;
 833         }
 834
 835         /* Convert the scatterlist to an sbp2 page table.  If any
 836          * scatterlist entries are too big for sbp2 we split the as we go. */
 837         for (i = 0, j = 0; i < count; i++) {
 838                 sg_len = sg_dma_len(sg + i);
 839                 sg_addr = sg_dma_address(sg + i);
 840                 while (sg_len) {
 841                         l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
 842                         orb->page_table[j].low = sg_addr;
 843                         orb->page_table[j].high = (l << 16);
 844                         sg_addr += l;
 845                         sg_len -= l;
 846                         j++;
 847                 }
 848         }
 849
 850         size = sizeof orb->page_table[0] * j;
 851
 852         /* The data_descriptor pointer is the one case where we need
 853          * to fill in the node ID part of the address.  All other
 854          * pointers assume that the data referenced reside on the
 855          * initiator (i.e. us), but data_descriptor can refer to data
 856          * on other nodes so we need to put our ID in descriptor.high. */
 857
 858         orb->page_table_bus =
 859                 dma_map_single(device->card->device, orb->page_table,
 860                                size, DMA_TO_DEVICE);
 861         orb->request.data_descriptor.high = sd->address_high;
 862         orb->request.data_descriptor.low  = orb->page_table_bus;
 863         orb->request.misc |=
 864                 command_orb_page_table_present |
 865                 command_orb_data_size(j);
 866
 867         fw_memcpy_to_be32(orb->page_table, orb->page_table, size);
 868 }
 869
 870 static void sbp2_command_orb_map_buffer(struct sbp2_command_orb *orb)
 871 {
 872         struct fw_unit *unit =
 873                 (struct fw_unit *)orb->cmd->device->host->hostdata[0];
 874         struct fw_device *device = fw_device(unit->device.parent);
 875         struct sbp2_device *sd = unit->device.driver_data;
 876
 877         /* As for map_scatterlist, we need to fill in the high bits of
 878          * the data_descriptor pointer. */
 879
 880         orb->request_buffer_bus =
 881                 dma_map_single(device->card->device,
 882                                orb->cmd->request_buffer,
 883                                orb->cmd->request_bufflen,
 884                                orb->cmd->sc_data_direction);
 885         orb->request.data_descriptor.high = sd->address_high;
 886         orb->request.data_descriptor.low  = orb->request_buffer_bus;
 887         orb->request.misc |=
 888                 command_orb_data_size(orb->cmd->request_bufflen);
 889 }
 890
 891 /* SCSI stack integration */
 892
 893 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 894 {
 895         struct fw_unit *unit = (struct fw_unit *)cmd->device->host->hostdata[0];
 896         struct fw_device *device = fw_device(unit->device.parent);
 897         struct sbp2_device *sd = unit->device.driver_data;
 898         struct sbp2_command_orb *orb;
 899
 900         /* Bidirectional commands are not yet implemented, and unknown
 901          * transfer direction not handled. */
 902         if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
 903                 fw_error("Cannot handle DMA_BIDIRECTIONAL - rejecting command");
 904                 cmd->result = DID_ERROR << 16;
 905                 done(cmd);
 906                 return 0;
 907         }
 908
 909         orb = kzalloc(sizeof *orb, GFP_ATOMIC);
 910         if (orb == NULL) {
 911                 fw_notify("failed to alloc orb\n");
 912                 cmd->result = DID_NO_CONNECT << 16;
 913                 done(cmd);
 914                 return 0;
 915         }
 916
 917         orb->base.request_bus =
 918                 dma_map_single(device->card->device, &orb->request,
 919                                sizeof orb->request, DMA_TO_DEVICE);
 920
 921         orb->unit = unit;
 922         orb->done = done;
 923         orb->cmd  = cmd;
 924
 925         orb->request.next.high   = SBP2_ORB_NULL;
 926         orb->request.next.low    = 0x0;
 927         /* At speed 100 we can do 512 bytes per packet, at speed 200,
 928          * 1024 bytes per packet etc.  The SBP-2 max_payload field
 929          * specifies the max payload size as 2 ^ (max_payload + 2), so
 930          * if we set this to max_speed + 7, we get the right value. */
 931         orb->request.misc =
 932                 command_orb_max_payload(device->node->max_speed + 7) |
 933                 command_orb_speed(device->node->max_speed) |
 934                 command_orb_notify;
 935
 936         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 937                 orb->request.misc |=
 938                         command_orb_direction(SBP2_DIRECTION_FROM_MEDIA);
 939         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
 940                 orb->request.misc |=
 941                         command_orb_direction(SBP2_DIRECTION_TO_MEDIA);
 942
 943         if (cmd->use_sg) {
 944                 sbp2_command_orb_map_scatterlist(orb);
 945         } else if (cmd->request_bufflen > SBP2_MAX_SG_ELEMENT_LENGTH) {
 946                 /* FIXME: Need to split this into a sg list... but
 947                  * could we get the scsi or blk layer to do that by
 948                  * reporting our max supported block size? */
 949                 fw_error("command > 64k\n");
 950                 cmd->result = DID_ERROR << 16;
 951                 done(cmd);
 952                 return 0;
 953         } else if (cmd->request_bufflen > 0) {
 954                 sbp2_command_orb_map_buffer(orb);
 955         }
 956
 957         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof orb->request);
 958
 959         memset(orb->request.command_block,
 960                0, sizeof orb->request.command_block);
 961         memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
 962
 963         orb->base.callback = complete_command_orb;
 964
 965         sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation,
 966                       sd->command_block_agent_address + SBP2_ORB_POINTER);
 967
 968         return 0;
 969 }
 970
 971 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
 972 {
 973         struct fw_unit *unit = (struct fw_unit *)sdev->host->hostdata[0];
 974         struct sbp2_device *sd = unit->device.driver_data;
 975
 976         sdev->allow_restart = 1;
 977
 978         if (sd->workarounds & SBP2_WORKAROUND_INQUIRY_36)
 979                 sdev->inquiry_len = 36;
 980         return 0;
 981 }
 982
 983 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
 984 {
 985         struct fw_unit *unit = (struct fw_unit *)sdev->host->hostdata[0];
 986         struct sbp2_device *sd = unit->device.driver_data;
 987
 988         sdev->use_10_for_rw = 1;
 989
 990         if (sdev->type == TYPE_ROM)
 991                 sdev->use_10_for_ms = 1;
 992         if (sdev->type == TYPE_DISK &&
 993             sd->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
 994                 sdev->skip_ms_page_8 = 1;
 995         if (sd->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) {
 996                 fw_notify("setting fix_capacity for %s\n", unit->device.bus_id);
 997                 sdev->fix_capacity = 1;
 998         }
 999
1000         return 0;
1001 }
1002
1003 /*
1004  * Called by scsi stack when something has really gone wrong.  Usually
1005  * called when a command has timed-out for some reason.
1006  */
1007 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1008 {
1009         struct fw_unit *unit = (struct fw_unit *)cmd->device->host->hostdata[0];
1010
1011         fw_notify("sbp2_scsi_abort\n");
1012
1013         sbp2_cancel_orbs(unit);
1014
1015         return SUCCESS;
1016 }
1017
1018 static struct scsi_host_template scsi_driver_template = {
1019         .module                 = THIS_MODULE,
1020         .name                   = "SBP-2 IEEE-1394",
1021         .proc_name              = (char *)sbp2_driver_name,
1022         .queuecommand           = sbp2_scsi_queuecommand,
1023         .slave_alloc            = sbp2_scsi_slave_alloc,
1024         .slave_configure        = sbp2_scsi_slave_configure,
1025         .eh_abort_handler       = sbp2_scsi_abort,
1026         .this_id                = -1,
1027         .sg_tablesize           = SG_ALL,
1028         .use_clustering         = ENABLE_CLUSTERING,
1029         .cmd_per_lun            = 1,
1030         .can_queue              = 1,
1031 };
1032
1033 static int add_scsi_devices(struct fw_unit *unit)
1034 {
1035         struct sbp2_device *sd = unit->device.driver_data;
1036         int retval, lun;
1037
1038         sd->scsi_host = scsi_host_alloc(&scsi_driver_template,
1039                                         sizeof(unsigned long));
1040         if (sd->scsi_host == NULL) {
1041                 fw_error("failed to register scsi host\n");
1042                 return -1;
1043         }
1044
1045         sd->scsi_host->hostdata[0] = (unsigned long)unit;
1046         retval = scsi_add_host(sd->scsi_host, &unit->device);
1047         if (retval < 0) {
1048                 fw_error("failed to add scsi host\n");
1049                 scsi_host_put(sd->scsi_host);
1050                 return retval;
1051         }
1052
1053         /* FIXME: Loop over luns here. */
1054         lun = 0;
1055         retval = scsi_add_device(sd->scsi_host, 0, 0, lun);
1056         if (retval < 0) {
1057                 fw_error("failed to add scsi device\n");
1058                 scsi_remove_host(sd->scsi_host);
1059                 scsi_host_put(sd->scsi_host);
1060                 return retval;
1061         }
1062
1063         return 0;
1064 }
1065
1066 static void remove_scsi_devices(struct fw_unit *unit)
1067 {
1068         struct sbp2_device *sd = unit->device.driver_data;
1069
1070         scsi_remove_host(sd->scsi_host);
1071         scsi_host_put(sd->scsi_host);
1072 }
1073
1074 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1075 MODULE_DESCRIPTION("SCSI over IEEE1394");
1076 MODULE_LICENSE("GPL");
1077 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1078
1079 static int __init sbp2_init(void)
1080 {
1081         return driver_register(&sbp2_driver.driver);
1082 }
1083
1084 static void __exit sbp2_cleanup(void)
1085 {
1086         driver_unregister(&sbp2_driver.driver);
1087 }
1088
1089 module_init(sbp2_init);
1090 module_exit(sbp2_cleanup);