err.no Git - linux-2.6/blob - drivers/firewire/fw-transaction.c

   1 /*                                              -*- c-basic-offset: 8 -*-
   2  *
   3  * fw-transaction.c - core IEEE1394 transaction logic
   4  *
   5  * Copyright (C) 2004-2006 Kristian Hoegsberg <krh@bitplanet.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software Foundation,
  19  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/pci.h>
  27 #include <linux/delay.h>
  28 #include <linux/poll.h>
  29 #include <linux/list.h>
  30 #include <linux/kthread.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/semaphore.h>
  33
  34 #include "fw-transaction.h"
  35 #include "fw-topology.h"
  36 #include "fw-device.h"
  37
  38 #define header_pri(pri)                 ((pri) << 0)
  39 #define header_tcode(tcode)             ((tcode) << 4)
  40 #define header_retry(retry)             ((retry) << 8)
  41 #define header_tlabel(tlabel)           ((tlabel) << 10)
  42 #define header_destination(destination) ((destination) << 16)
  43 #define header_source(source)           ((source) << 16)
  44 #define header_rcode(rcode)             ((rcode) << 12)
  45 #define header_offset_high(offset_high) ((offset_high) << 0)
  46 #define header_data_length(length)      ((length) << 16)
  47 #define header_extended_tcode(tcode)    ((tcode) << 0)
  48
  49 #define header_get_tcode(q)             (((q) >> 4) & 0x0f)
  50 #define header_get_tlabel(q)            (((q) >> 10) & 0x3f)
  51 #define header_get_rcode(q)             (((q) >> 12) & 0x0f)
  52 #define header_get_destination(q)       (((q) >> 16) & 0xffff)
  53 #define header_get_source(q)            (((q) >> 16) & 0xffff)
  54 #define header_get_offset_high(q)       (((q) >> 0) & 0xffff)
  55 #define header_get_data_length(q)       (((q) >> 16) & 0xffff)
  56 #define header_get_extended_tcode(q)    (((q) >> 0) & 0xffff)
  57
  58 #define phy_config_gap_count(gap_count) (((gap_count) << 16) | (1 << 22))
  59 #define phy_config_root_id(node_id)     ((((node_id) & 0x3f) << 24) | (1 << 23))
  60 #define phy_identifier(id)              ((id) << 30)
  61
  62 static int
  63 close_transaction(struct fw_transaction *transaction,
  64                   struct fw_card *card, int rcode,
  65                   u32 *payload, size_t length)
  66 {
  67         struct fw_transaction *t;
  68         unsigned long flags;
  69
  70         spin_lock_irqsave(&card->lock, flags);
  71         list_for_each_entry(t, &card->transaction_list, link) {
  72                 if (t == transaction) {
  73                         list_del(&t->link);
  74                         card->tlabel_mask &= ~(1 << t->tlabel);
  75                         break;
  76                 }
  77         }
  78         spin_unlock_irqrestore(&card->lock, flags);
  79
  80         if (&t->link != &card->transaction_list) {
  81                 t->callback(card, rcode, payload, length, t->callback_data);
  82                 return 0;
  83         }
  84
  85         return -ENOENT;
  86 }
  87
  88 /* Only valid for transactions that are potentially pending (ie have
  89  * been sent). */
  90 int
  91 fw_cancel_transaction(struct fw_card *card,
  92                       struct fw_transaction *transaction)
  93 {
  94         /* Cancel the packet transmission if it's still queued.  That
  95          * will call the packet transmission callback which cancels
  96          * the transaction. */
  97
  98         if (card->driver->cancel_packet(card, &transaction->packet) == 0)
  99                 return 0;
 100
 101         /* If the request packet has already been sent, we need to see
 102          * if the transaction is still pending and remove it in that case. */
 103
 104         return close_transaction(transaction, card, RCODE_CANCELLED, NULL, 0);
 105 }
 106 EXPORT_SYMBOL(fw_cancel_transaction);
 107
 108 static void
 109 transmit_complete_callback(struct fw_packet *packet,
 110                            struct fw_card *card, int status)
 111 {
 112         struct fw_transaction *t =
 113             container_of(packet, struct fw_transaction, packet);
 114
 115         switch (status) {
 116         case ACK_COMPLETE:
 117                 close_transaction(t, card, RCODE_COMPLETE, NULL, 0);
 118                 break;
 119         case ACK_PENDING:
 120                 t->timestamp = packet->timestamp;
 121                 break;
 122         case ACK_BUSY_X:
 123         case ACK_BUSY_A:
 124         case ACK_BUSY_B:
 125                 close_transaction(t, card, RCODE_BUSY, NULL, 0);
 126                 break;
 127         case ACK_DATA_ERROR:
 128                 close_transaction(t, card, RCODE_DATA_ERROR, NULL, 0);
 129                 break;
 130         case ACK_TYPE_ERROR:
 131                 close_transaction(t, card, RCODE_TYPE_ERROR, NULL, 0);
 132                 break;
 133         default:
 134                 /* In this case the ack is really a juju specific
 135                  * rcode, so just forward that to the callback. */
 136                 close_transaction(t, card, status, NULL, 0);
 137                 break;
 138         }
 139 }
 140
 141 static void
 142 fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
 143                 int node_id, int generation, int speed,
 144                 unsigned long long offset, void *payload, size_t length)
 145 {
 146         int ext_tcode;
 147
 148         if (tcode > 0x10) {
 149                 ext_tcode = tcode - 0x10;
 150                 tcode = TCODE_LOCK_REQUEST;
 151         } else
 152                 ext_tcode = 0;
 153
 154         packet->header[0] =
 155                 header_retry(RETRY_X) |
 156                 header_tlabel(tlabel) |
 157                 header_tcode(tcode) |
 158                 header_destination(node_id);
 159         packet->header[1] =
 160                 header_offset_high(offset >> 32) | header_source(0);
 161         packet->header[2] =
 162                 offset;
 163
 164         switch (tcode) {
 165         case TCODE_WRITE_QUADLET_REQUEST:
 166                 packet->header[3] = *(u32 *)payload;
 167                 packet->header_length = 16;
 168                 packet->payload_length = 0;
 169                 break;
 170
 171         case TCODE_LOCK_REQUEST:
 172         case TCODE_WRITE_BLOCK_REQUEST:
 173                 packet->header[3] =
 174                         header_data_length(length) |
 175                         header_extended_tcode(ext_tcode);
 176                 packet->header_length = 16;
 177                 packet->payload = payload;
 178                 packet->payload_length = length;
 179                 break;
 180
 181         case TCODE_READ_QUADLET_REQUEST:
 182                 packet->header_length = 12;
 183                 packet->payload_length = 0;
 184                 break;
 185
 186         case TCODE_READ_BLOCK_REQUEST:
 187                 packet->header[3] =
 188                         header_data_length(length) |
 189                         header_extended_tcode(ext_tcode);
 190                 packet->header_length = 16;
 191                 packet->payload_length = 0;
 192                 break;
 193         }
 194
 195         packet->speed = speed;
 196         packet->generation = generation;
 197         packet->ack = 0;
 198 }
 199
 200 /**
 201  * This function provides low-level access to the IEEE1394 transaction
 202  * logic.  Most C programs would use either fw_read(), fw_write() or
 203  * fw_lock() instead - those function are convenience wrappers for
 204  * this function.  The fw_send_request() function is primarily
 205  * provided as a flexible, one-stop entry point for languages bindings
 206  * and protocol bindings.
 207  *
 208  * FIXME: Document this function further, in particular the possible
 209  * values for rcode in the callback.  In short, we map ACK_COMPLETE to
 210  * RCODE_COMPLETE, internal errors set errno and set rcode to
 211  * RCODE_SEND_ERROR (which is out of range for standard ieee1394
 212  * rcodes).  All other rcodes are forwarded unchanged.  For all
 213  * errors, payload is NULL, length is 0.
 214  *
 215  * Can not expect the callback to be called before the function
 216  * returns, though this does happen in some cases (ACK_COMPLETE and
 217  * errors).
 218  *
 219  * The payload is only used for write requests and must not be freed
 220  * until the callback has been called.
 221  *
 222  * @param card the card from which to send the request
 223  * @param tcode the tcode for this transaction.  Do not use
 224  *   TCODE_LOCK_REQUEST directly, insted use TCODE_LOCK_MASK_SWAP
 225  *   etc. to specify tcode and ext_tcode.
 226  * @param node_id the destination node ID (bus ID and PHY ID concatenated)
 227  * @param generation the generation for which node_id is valid
 228  * @param speed the speed to use for sending the request
 229  * @param offset the 48 bit offset on the destination node
 230  * @param payload the data payload for the request subaction
 231  * @param length the length in bytes of the data to read
 232  * @param callback function to be called when the transaction is completed
 233  * @param callback_data pointer to arbitrary data, which will be
 234  *   passed to the callback
 235  */
 236 void
 237 fw_send_request(struct fw_card *card, struct fw_transaction *t,
 238                 int tcode, int node_id, int generation, int speed,
 239                 unsigned long long offset,
 240                 void *payload, size_t length,
 241                 fw_transaction_callback_t callback, void *callback_data)
 242 {
 243         unsigned long flags;
 244         int tlabel;
 245
 246         /* Bump the flush timer up 100ms first of all so we
 247          * don't race with a flush timer callback. */
 248
 249         mod_timer(&card->flush_timer, jiffies + DIV_ROUND_UP(HZ, 10));
 250
 251         /* Allocate tlabel from the bitmap and put the transaction on
 252          * the list while holding the card spinlock. */
 253
 254         spin_lock_irqsave(&card->lock, flags);
 255
 256         tlabel = card->current_tlabel;
 257         if (card->tlabel_mask & (1 << tlabel)) {
 258                 spin_unlock_irqrestore(&card->lock, flags);
 259                 callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
 260                 return;
 261         }
 262
 263         card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
 264         card->tlabel_mask |= (1 << tlabel);
 265
 266         list_add_tail(&t->link, &card->transaction_list);
 267
 268         spin_unlock_irqrestore(&card->lock, flags);
 269
 270         /* Initialize rest of transaction, fill out packet and send it. */
 271         t->node_id = node_id;
 272         t->tlabel = tlabel;
 273         t->callback = callback;
 274         t->callback_data = callback_data;
 275
 276         fw_fill_request(&t->packet, tcode, t->tlabel,
 277                         node_id, generation, speed, offset, payload, length);
 278         t->packet.callback = transmit_complete_callback;
 279
 280         card->driver->send_request(card, &t->packet);
 281 }
 282 EXPORT_SYMBOL(fw_send_request);
 283
 284 static void
 285 transmit_phy_packet_callback(struct fw_packet *packet,
 286                              struct fw_card *card, int status)
 287 {
 288         kfree(packet);
 289 }
 290
 291 static void send_phy_packet(struct fw_card *card, u32 data, int generation)
 292 {
 293         struct fw_packet *packet;
 294
 295         packet = kzalloc(sizeof *packet, GFP_ATOMIC);
 296         if (packet == NULL)
 297                 return;
 298
 299         packet->header[0] = data;
 300         packet->header[1] = ~data;
 301         packet->header_length = 8;
 302         packet->payload_length = 0;
 303         packet->speed = SCODE_100;
 304         packet->generation = generation;
 305         packet->callback = transmit_phy_packet_callback;
 306
 307         card->driver->send_request(card, packet);
 308 }
 309
 310 void fw_send_phy_config(struct fw_card *card,
 311                         int node_id, int generation, int gap_count)
 312 {
 313         u32 q;
 314
 315         q = phy_identifier(PHY_PACKET_CONFIG) |
 316                 phy_config_root_id(node_id) |
 317                 phy_config_gap_count(gap_count);
 318
 319         send_phy_packet(card, q, generation);
 320 }
 321
 322 void fw_flush_transactions(struct fw_card *card)
 323 {
 324         struct fw_transaction *t, *next;
 325         struct list_head list;
 326         unsigned long flags;
 327
 328         INIT_LIST_HEAD(&list);
 329         spin_lock_irqsave(&card->lock, flags);
 330         list_splice_init(&card->transaction_list, &list);
 331         card->tlabel_mask = 0;
 332         spin_unlock_irqrestore(&card->lock, flags);
 333
 334         list_for_each_entry_safe(t, next, &list, link) {
 335                 card->driver->cancel_packet(card, &t->packet);
 336
 337                 /* At this point cancel_packet will never call the
 338                  * transaction callback, since we just took all the
 339                  * transactions out of the list.  So do it here.*/
 340                 t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
 341         }
 342 }
 343
 344 static struct fw_address_handler *
 345 lookup_overlapping_address_handler(struct list_head *list,
 346                                    unsigned long long offset, size_t length)
 347 {
 348         struct fw_address_handler *handler;
 349
 350         list_for_each_entry(handler, list, link) {
 351                 if (handler->offset < offset + length &&
 352                     offset < handler->offset + handler->length)
 353                         return handler;
 354         }
 355
 356         return NULL;
 357 }
 358
 359 static struct fw_address_handler *
 360 lookup_enclosing_address_handler(struct list_head *list,
 361                                  unsigned long long offset, size_t length)
 362 {
 363         struct fw_address_handler *handler;
 364
 365         list_for_each_entry(handler, list, link) {
 366                 if (handler->offset <= offset &&
 367                     offset + length <= handler->offset + handler->length)
 368                         return handler;
 369         }
 370
 371         return NULL;
 372 }
 373
 374 static DEFINE_SPINLOCK(address_handler_lock);
 375 static LIST_HEAD(address_handler_list);
 376
 377 const struct fw_address_region fw_low_memory_region =
 378         { .start = 0x000000000000ULL, .end = 0x000100000000ULL,  };
 379 const struct fw_address_region fw_high_memory_region =
 380         { .start = 0x000100000000ULL, .end = 0xffffe0000000ULL,  };
 381 const struct fw_address_region fw_private_region =
 382         { .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL,  };
 383 const struct fw_address_region fw_csr_region =
 384         { .start = 0xfffff0000000ULL, .end = 0xfffff0000800ULL,  };
 385 const struct fw_address_region fw_unit_space_region =
 386         { .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
 387 EXPORT_SYMBOL(fw_low_memory_region);
 388 EXPORT_SYMBOL(fw_high_memory_region);
 389 EXPORT_SYMBOL(fw_private_region);
 390 EXPORT_SYMBOL(fw_csr_region);
 391 EXPORT_SYMBOL(fw_unit_space_region);
 392
 393 /**
 394  * Allocate a range of addresses in the node space of the OHCI
 395  * controller.  When a request is received that falls within the
 396  * specified address range, the specified callback is invoked.  The
 397  * parameters passed to the callback give the details of the
 398  * particular request
 399  */
 400 int
 401 fw_core_add_address_handler(struct fw_address_handler *handler,
 402                             const struct fw_address_region *region)
 403 {
 404         struct fw_address_handler *other;
 405         unsigned long flags;
 406         int ret = -EBUSY;
 407
 408         spin_lock_irqsave(&address_handler_lock, flags);
 409
 410         handler->offset = region->start;
 411         while (handler->offset + handler->length <= region->end) {
 412                 other =
 413                     lookup_overlapping_address_handler(&address_handler_list,
 414                                                        handler->offset,
 415                                                        handler->length);
 416                 if (other != NULL) {
 417                         handler->offset += other->length;
 418                 } else {
 419                         list_add_tail(&handler->link, &address_handler_list);
 420                         ret = 0;
 421                         break;
 422                 }
 423         }
 424
 425         spin_unlock_irqrestore(&address_handler_lock, flags);
 426
 427         return ret;
 428 }
 429 EXPORT_SYMBOL(fw_core_add_address_handler);
 430
 431 /**
 432  * Deallocate a range of addresses allocated with fw_allocate.  This
 433  * will call the associated callback one last time with a the special
 434  * tcode TCODE_DEALLOCATE, to let the client destroy the registered
 435  * callback data.  For convenience, the callback parameters offset and
 436  * length are set to the start and the length respectively for the
 437  * deallocated region, payload is set to NULL.
 438  */
 439 void fw_core_remove_address_handler(struct fw_address_handler *handler)
 440 {
 441         unsigned long flags;
 442
 443         spin_lock_irqsave(&address_handler_lock, flags);
 444         list_del(&handler->link);
 445         spin_unlock_irqrestore(&address_handler_lock, flags);
 446 }
 447 EXPORT_SYMBOL(fw_core_remove_address_handler);
 448
 449 struct fw_request {
 450         struct fw_packet response;
 451         u32 request_header[4];
 452         int ack;
 453         u32 length;
 454         u32 data[0];
 455 };
 456
 457 static void
 458 free_response_callback(struct fw_packet *packet,
 459                        struct fw_card *card, int status)
 460 {
 461         struct fw_request *request;
 462
 463         request = container_of(packet, struct fw_request, response);
 464         kfree(request);
 465 }
 466
 467 void
 468 fw_fill_response(struct fw_packet *response, u32 *request_header,
 469                  int rcode, void *payload, size_t length)
 470 {
 471         int tcode, tlabel, extended_tcode, source, destination;
 472
 473         tcode          = header_get_tcode(request_header[0]);
 474         tlabel         = header_get_tlabel(request_header[0]);
 475         source         = header_get_destination(request_header[0]);
 476         destination    = header_get_source(request_header[1]);
 477         extended_tcode = header_get_extended_tcode(request_header[3]);
 478
 479         response->header[0] =
 480                 header_retry(RETRY_1) |
 481                 header_tlabel(tlabel) |
 482                 header_destination(destination);
 483         response->header[1] =
 484                 header_source(source) |
 485                 header_rcode(rcode);
 486         response->header[2] = 0;
 487
 488         switch (tcode) {
 489         case TCODE_WRITE_QUADLET_REQUEST:
 490         case TCODE_WRITE_BLOCK_REQUEST:
 491                 response->header[0] |= header_tcode(TCODE_WRITE_RESPONSE);
 492                 response->header_length = 12;
 493                 response->payload_length = 0;
 494                 break;
 495
 496         case TCODE_READ_QUADLET_REQUEST:
 497                 response->header[0] |=
 498                         header_tcode(TCODE_READ_QUADLET_RESPONSE);
 499                 if (payload != NULL)
 500                         response->header[3] = *(u32 *)payload;
 501                 else
 502                         response->header[3] = 0;
 503                 response->header_length = 16;
 504                 response->payload_length = 0;
 505                 break;
 506
 507         case TCODE_READ_BLOCK_REQUEST:
 508         case TCODE_LOCK_REQUEST:
 509                 response->header[0] |= header_tcode(tcode + 2);
 510                 response->header[3] =
 511                         header_data_length(length) |
 512                         header_extended_tcode(extended_tcode);
 513                 response->header_length = 16;
 514                 response->payload = payload;
 515                 response->payload_length = length;
 516                 break;
 517
 518         default:
 519                 BUG();
 520                 return;
 521         }
 522 }
 523 EXPORT_SYMBOL(fw_fill_response);
 524
 525 static struct fw_request *
 526 allocate_request(struct fw_packet *p)
 527 {
 528         struct fw_request *request;
 529         u32 *data, length;
 530         int request_tcode, t;
 531
 532         request_tcode = header_get_tcode(p->header[0]);
 533         switch (request_tcode) {
 534         case TCODE_WRITE_QUADLET_REQUEST:
 535                 data = &p->header[3];
 536                 length = 4;
 537                 break;
 538
 539         case TCODE_WRITE_BLOCK_REQUEST:
 540         case TCODE_LOCK_REQUEST:
 541                 data = p->payload;
 542                 length = header_get_data_length(p->header[3]);
 543                 break;
 544
 545         case TCODE_READ_QUADLET_REQUEST:
 546                 data = NULL;
 547                 length = 4;
 548                 break;
 549
 550         case TCODE_READ_BLOCK_REQUEST:
 551                 data = NULL;
 552                 length = header_get_data_length(p->header[3]);
 553                 break;
 554
 555         default:
 556                 BUG();
 557                 return NULL;
 558         }
 559
 560         request = kmalloc(sizeof *request + length, GFP_ATOMIC);
 561         if (request == NULL)
 562                 return NULL;
 563
 564         t = (p->timestamp & 0x1fff) + 4000;
 565         if (t >= 8000)
 566                 t = (p->timestamp & ~0x1fff) + 0x2000 + t - 8000;
 567         else
 568                 t = (p->timestamp & ~0x1fff) + t;
 569
 570         request->response.speed = p->speed;
 571         request->response.timestamp = t;
 572         request->response.generation = p->generation;
 573         request->response.ack = 0;
 574         request->response.callback = free_response_callback;
 575         request->ack = p->ack;
 576         request->length = length;
 577         if (data)
 578                 memcpy(request->data, p->payload, length);
 579
 580         memcpy(request->request_header, p->header, sizeof p->header);
 581
 582         return request;
 583 }
 584
 585 void
 586 fw_send_response(struct fw_card *card, struct fw_request *request, int rcode)
 587 {
 588         /* Broadcast packets are reported as ACK_COMPLETE, so this
 589          * check is sufficient to ensure we don't send response to
 590          * broadcast packets or posted writes. */
 591         if (request->ack != ACK_PENDING)
 592                 return;
 593
 594         if (rcode == RCODE_COMPLETE)
 595                 fw_fill_response(&request->response, request->request_header,
 596                                  rcode, request->data, request->length);
 597         else
 598                 fw_fill_response(&request->response, request->request_header,
 599                                  rcode, NULL, 0);
 600
 601         card->driver->send_response(card, &request->response);
 602 }
 603 EXPORT_SYMBOL(fw_send_response);
 604
 605 void
 606 fw_core_handle_request(struct fw_card *card, struct fw_packet *p)
 607 {
 608         struct fw_address_handler *handler;
 609         struct fw_request *request;
 610         unsigned long long offset;
 611         unsigned long flags;
 612         int tcode, destination, source;
 613
 614         if (p->payload_length > 2048) {
 615                 /* FIXME: send error response. */
 616                 return;
 617         }
 618
 619         if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE)
 620                 return;
 621
 622         request = allocate_request(p);
 623         if (request == NULL) {
 624                 /* FIXME: send statically allocated busy packet. */
 625                 return;
 626         }
 627
 628         offset      =
 629                 ((unsigned long long)
 630                  header_get_offset_high(p->header[1]) << 32) | p->header[2];
 631         tcode       = header_get_tcode(p->header[0]);
 632         destination = header_get_destination(p->header[0]);
 633         source      = header_get_source(p->header[0]);
 634
 635         spin_lock_irqsave(&address_handler_lock, flags);
 636         handler = lookup_enclosing_address_handler(&address_handler_list,
 637                                                    offset, request->length);
 638         spin_unlock_irqrestore(&address_handler_lock, flags);
 639
 640         /* FIXME: lookup the fw_node corresponding to the sender of
 641          * this request and pass that to the address handler instead
 642          * of the node ID.  We may also want to move the address
 643          * allocations to fw_node so we only do this callback if the
 644          * upper layers registered it for this node. */
 645
 646         if (handler == NULL)
 647                 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
 648         else
 649                 handler->address_callback(card, request,
 650                                           tcode, destination, source,
 651                                           p->generation, p->speed, offset,
 652                                           request->data, request->length,
 653                                           handler->callback_data);
 654 }
 655 EXPORT_SYMBOL(fw_core_handle_request);
 656
 657 void
 658 fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
 659 {
 660         struct fw_transaction *t;
 661         unsigned long flags;
 662         u32 *data;
 663         size_t data_length;
 664         int tcode, tlabel, destination, source, rcode;
 665
 666         tcode       = header_get_tcode(p->header[0]);
 667         tlabel      = header_get_tlabel(p->header[0]);
 668         destination = header_get_destination(p->header[0]);
 669         source      = header_get_source(p->header[1]);
 670         rcode       = header_get_rcode(p->header[1]);
 671
 672         spin_lock_irqsave(&card->lock, flags);
 673         list_for_each_entry(t, &card->transaction_list, link) {
 674                 if (t->node_id == source && t->tlabel == tlabel) {
 675                         list_del(&t->link);
 676                         card->tlabel_mask &= ~(1 << t->tlabel);
 677                         break;
 678                 }
 679         }
 680         spin_unlock_irqrestore(&card->lock, flags);
 681
 682         if (&t->link == &card->transaction_list) {
 683                 fw_notify("Unsolicited response (source %x, tlabel %x)\n",
 684                           source, tlabel);
 685                 return;
 686         }
 687
 688         /* FIXME: sanity check packet, is length correct, does tcodes
 689          * and addresses match. */
 690
 691         switch (tcode) {
 692         case TCODE_READ_QUADLET_RESPONSE:
 693                 data = (u32 *) &p->header[3];
 694                 data_length = 4;
 695                 break;
 696
 697         case TCODE_WRITE_RESPONSE:
 698                 data = NULL;
 699                 data_length = 0;
 700                 break;
 701
 702         case TCODE_READ_BLOCK_RESPONSE:
 703         case TCODE_LOCK_RESPONSE:
 704                 data = p->payload;
 705                 data_length = header_get_data_length(p->header[3]);
 706                 break;
 707
 708         default:
 709                 /* Should never happen, this is just to shut up gcc. */
 710                 data = NULL;
 711                 data_length = 0;
 712                 break;
 713         }
 714
 715         t->callback(card, rcode, data, data_length, t->callback_data);
 716 }
 717 EXPORT_SYMBOL(fw_core_handle_response);
 718
 719 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
 720 MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
 721 MODULE_LICENSE("GPL");
 722
 723 static const u32 vendor_textual_descriptor_data[] = {
 724         /* textual descriptor leaf () */
 725         0x00080000,
 726         0x00000000,
 727         0x00000000,
 728         0x4c696e75,             /* L i n u */
 729         0x78204669,             /* x   F i */
 730         0x72657769,             /* r e w i */
 731         0x72652028,             /* r e   ( */
 732         0x4a554a55,             /* J U J U */
 733         0x29000000,             /* )       */
 734 };
 735
 736 static struct fw_descriptor vendor_textual_descriptor = {
 737         .length = ARRAY_SIZE(vendor_textual_descriptor_data),
 738         .key = 0x81000000,
 739         .data = vendor_textual_descriptor_data,
 740 };
 741
 742 static int __init fw_core_init(void)
 743 {
 744         int retval;
 745
 746         retval = bus_register(&fw_bus_type);
 747         if (retval < 0)
 748                 return retval;
 749
 750         /* Add the vendor textual descriptor. */
 751         retval = fw_core_add_descriptor(&vendor_textual_descriptor);
 752         BUG_ON(retval < 0);
 753
 754         return 0;
 755 }
 756
 757 static void __exit fw_core_cleanup(void)
 758 {
 759         bus_unregister(&fw_bus_type);
 760 }
 761
 762 module_init(fw_core_init);
 763 module_exit(fw_core_cleanup);