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 source_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(source_id);
 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, source;
 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         source = card->node_id;
 257         tlabel = card->current_tlabel;
 258         if (card->tlabel_mask & (1 << tlabel)) {
 259                 spin_unlock_irqrestore(&card->lock, flags);
 260                 callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
 261                 return;
 262         }
 263
 264         card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
 265         card->tlabel_mask |= (1 << tlabel);
 266
 267         list_add_tail(&t->link, &card->transaction_list);
 268
 269         spin_unlock_irqrestore(&card->lock, flags);
 270
 271         /* Initialize rest of transaction, fill out packet and send it. */
 272         t->node_id = node_id;
 273         t->tlabel = tlabel;
 274         t->callback = callback;
 275         t->callback_data = callback_data;
 276
 277         fw_fill_request(&t->packet, tcode, t->tlabel,
 278                         node_id, source, generation,
 279                         speed, offset, payload, length);
 280         t->packet.callback = transmit_complete_callback;
 281
 282         card->driver->send_request(card, &t->packet);
 283 }
 284 EXPORT_SYMBOL(fw_send_request);
 285
 286 static void
 287 transmit_phy_packet_callback(struct fw_packet *packet,
 288                              struct fw_card *card, int status)
 289 {
 290         kfree(packet);
 291 }
 292
 293 static void send_phy_packet(struct fw_card *card, u32 data, int generation)
 294 {
 295         struct fw_packet *packet;
 296
 297         packet = kzalloc(sizeof *packet, GFP_ATOMIC);
 298         if (packet == NULL)
 299                 return;
 300
 301         packet->header[0] = data;
 302         packet->header[1] = ~data;
 303         packet->header_length = 8;
 304         packet->payload_length = 0;
 305         packet->speed = SCODE_100;
 306         packet->generation = generation;
 307         packet->callback = transmit_phy_packet_callback;
 308
 309         card->driver->send_request(card, packet);
 310 }
 311
 312 void fw_send_phy_config(struct fw_card *card,
 313                         int node_id, int generation, int gap_count)
 314 {
 315         u32 q;
 316
 317         q = phy_identifier(PHY_PACKET_CONFIG) |
 318                 phy_config_root_id(node_id) |
 319                 phy_config_gap_count(gap_count);
 320
 321         send_phy_packet(card, q, generation);
 322 }
 323
 324 void fw_flush_transactions(struct fw_card *card)
 325 {
 326         struct fw_transaction *t, *next;
 327         struct list_head list;
 328         unsigned long flags;
 329
 330         INIT_LIST_HEAD(&list);
 331         spin_lock_irqsave(&card->lock, flags);
 332         list_splice_init(&card->transaction_list, &list);
 333         card->tlabel_mask = 0;
 334         spin_unlock_irqrestore(&card->lock, flags);
 335
 336         list_for_each_entry_safe(t, next, &list, link) {
 337                 card->driver->cancel_packet(card, &t->packet);
 338
 339                 /* At this point cancel_packet will never call the
 340                  * transaction callback, since we just took all the
 341                  * transactions out of the list.  So do it here.*/
 342                 t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
 343         }
 344 }
 345
 346 static struct fw_address_handler *
 347 lookup_overlapping_address_handler(struct list_head *list,
 348                                    unsigned long long offset, size_t length)
 349 {
 350         struct fw_address_handler *handler;
 351
 352         list_for_each_entry(handler, list, link) {
 353                 if (handler->offset < offset + length &&
 354                     offset < handler->offset + handler->length)
 355                         return handler;
 356         }
 357
 358         return NULL;
 359 }
 360
 361 static struct fw_address_handler *
 362 lookup_enclosing_address_handler(struct list_head *list,
 363                                  unsigned long long offset, size_t length)
 364 {
 365         struct fw_address_handler *handler;
 366
 367         list_for_each_entry(handler, list, link) {
 368                 if (handler->offset <= offset &&
 369                     offset + length <= handler->offset + handler->length)
 370                         return handler;
 371         }
 372
 373         return NULL;
 374 }
 375
 376 static DEFINE_SPINLOCK(address_handler_lock);
 377 static LIST_HEAD(address_handler_list);
 378
 379 const struct fw_address_region fw_low_memory_region =
 380         { .start = 0x000000000000ULL, .end = 0x000100000000ULL,  };
 381 const struct fw_address_region fw_high_memory_region =
 382         { .start = 0x000100000000ULL, .end = 0xffffe0000000ULL,  };
 383 const struct fw_address_region fw_private_region =
 384         { .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL,  };
 385 const struct fw_address_region fw_csr_region =
 386         { .start = 0xfffff0000000ULL, .end = 0xfffff0000800ULL,  };
 387 const struct fw_address_region fw_unit_space_region =
 388         { .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
 389 EXPORT_SYMBOL(fw_low_memory_region);
 390 EXPORT_SYMBOL(fw_high_memory_region);
 391 EXPORT_SYMBOL(fw_private_region);
 392 EXPORT_SYMBOL(fw_csr_region);
 393 EXPORT_SYMBOL(fw_unit_space_region);
 394
 395 /**
 396  * Allocate a range of addresses in the node space of the OHCI
 397  * controller.  When a request is received that falls within the
 398  * specified address range, the specified callback is invoked.  The
 399  * parameters passed to the callback give the details of the
 400  * particular request
 401  */
 402 int
 403 fw_core_add_address_handler(struct fw_address_handler *handler,
 404                             const struct fw_address_region *region)
 405 {
 406         struct fw_address_handler *other;
 407         unsigned long flags;
 408         int ret = -EBUSY;
 409
 410         spin_lock_irqsave(&address_handler_lock, flags);
 411
 412         handler->offset = region->start;
 413         while (handler->offset + handler->length <= region->end) {
 414                 other =
 415                     lookup_overlapping_address_handler(&address_handler_list,
 416                                                        handler->offset,
 417                                                        handler->length);
 418                 if (other != NULL) {
 419                         handler->offset += other->length;
 420                 } else {
 421                         list_add_tail(&handler->link, &address_handler_list);
 422                         ret = 0;
 423                         break;
 424                 }
 425         }
 426
 427         spin_unlock_irqrestore(&address_handler_lock, flags);
 428
 429         return ret;
 430 }
 431 EXPORT_SYMBOL(fw_core_add_address_handler);
 432
 433 /**
 434  * Deallocate a range of addresses allocated with fw_allocate.  This
 435  * will call the associated callback one last time with a the special
 436  * tcode TCODE_DEALLOCATE, to let the client destroy the registered
 437  * callback data.  For convenience, the callback parameters offset and
 438  * length are set to the start and the length respectively for the
 439  * deallocated region, payload is set to NULL.
 440  */
 441 void fw_core_remove_address_handler(struct fw_address_handler *handler)
 442 {
 443         unsigned long flags;
 444
 445         spin_lock_irqsave(&address_handler_lock, flags);
 446         list_del(&handler->link);
 447         spin_unlock_irqrestore(&address_handler_lock, flags);
 448 }
 449 EXPORT_SYMBOL(fw_core_remove_address_handler);
 450
 451 struct fw_request {
 452         struct fw_packet response;
 453         u32 request_header[4];
 454         int ack;
 455         u32 length;
 456         u32 data[0];
 457 };
 458
 459 static void
 460 free_response_callback(struct fw_packet *packet,
 461                        struct fw_card *card, int status)
 462 {
 463         struct fw_request *request;
 464
 465         request = container_of(packet, struct fw_request, response);
 466         kfree(request);
 467 }
 468
 469 void
 470 fw_fill_response(struct fw_packet *response, u32 *request_header,
 471                  int rcode, void *payload, size_t length)
 472 {
 473         int tcode, tlabel, extended_tcode, source, destination;
 474
 475         tcode          = header_get_tcode(request_header[0]);
 476         tlabel         = header_get_tlabel(request_header[0]);
 477         source         = header_get_destination(request_header[0]);
 478         destination    = header_get_source(request_header[1]);
 479         extended_tcode = header_get_extended_tcode(request_header[3]);
 480
 481         response->header[0] =
 482                 header_retry(RETRY_1) |
 483                 header_tlabel(tlabel) |
 484                 header_destination(destination);
 485         response->header[1] =
 486                 header_source(source) |
 487                 header_rcode(rcode);
 488         response->header[2] = 0;
 489
 490         switch (tcode) {
 491         case TCODE_WRITE_QUADLET_REQUEST:
 492         case TCODE_WRITE_BLOCK_REQUEST:
 493                 response->header[0] |= header_tcode(TCODE_WRITE_RESPONSE);
 494                 response->header_length = 12;
 495                 response->payload_length = 0;
 496                 break;
 497
 498         case TCODE_READ_QUADLET_REQUEST:
 499                 response->header[0] |=
 500                         header_tcode(TCODE_READ_QUADLET_RESPONSE);
 501                 if (payload != NULL)
 502                         response->header[3] = *(u32 *)payload;
 503                 else
 504                         response->header[3] = 0;
 505                 response->header_length = 16;
 506                 response->payload_length = 0;
 507                 break;
 508
 509         case TCODE_READ_BLOCK_REQUEST:
 510         case TCODE_LOCK_REQUEST:
 511                 response->header[0] |= header_tcode(tcode + 2);
 512                 response->header[3] =
 513                         header_data_length(length) |
 514                         header_extended_tcode(extended_tcode);
 515                 response->header_length = 16;
 516                 response->payload = payload;
 517                 response->payload_length = length;
 518                 break;
 519
 520         default:
 521                 BUG();
 522                 return;
 523         }
 524 }
 525 EXPORT_SYMBOL(fw_fill_response);
 526
 527 static struct fw_request *
 528 allocate_request(struct fw_packet *p)
 529 {
 530         struct fw_request *request;
 531         u32 *data, length;
 532         int request_tcode, t;
 533
 534         request_tcode = header_get_tcode(p->header[0]);
 535         switch (request_tcode) {
 536         case TCODE_WRITE_QUADLET_REQUEST:
 537                 data = &p->header[3];
 538                 length = 4;
 539                 break;
 540
 541         case TCODE_WRITE_BLOCK_REQUEST:
 542         case TCODE_LOCK_REQUEST:
 543                 data = p->payload;
 544                 length = header_get_data_length(p->header[3]);
 545                 break;
 546
 547         case TCODE_READ_QUADLET_REQUEST:
 548                 data = NULL;
 549                 length = 4;
 550                 break;
 551
 552         case TCODE_READ_BLOCK_REQUEST:
 553                 data = NULL;
 554                 length = header_get_data_length(p->header[3]);
 555                 break;
 556
 557         default:
 558                 BUG();
 559                 return NULL;
 560         }
 561
 562         request = kmalloc(sizeof *request + length, GFP_ATOMIC);
 563         if (request == NULL)
 564                 return NULL;
 565
 566         t = (p->timestamp & 0x1fff) + 4000;
 567         if (t >= 8000)
 568                 t = (p->timestamp & ~0x1fff) + 0x2000 + t - 8000;
 569         else
 570                 t = (p->timestamp & ~0x1fff) + t;
 571
 572         request->response.speed = p->speed;
 573         request->response.timestamp = t;
 574         request->response.generation = p->generation;
 575         request->response.ack = 0;
 576         request->response.callback = free_response_callback;
 577         request->ack = p->ack;
 578         request->length = length;
 579         if (data)
 580                 memcpy(request->data, data, length);
 581
 582         memcpy(request->request_header, p->header, sizeof p->header);
 583
 584         return request;
 585 }
 586
 587 void
 588 fw_send_response(struct fw_card *card, struct fw_request *request, int rcode)
 589 {
 590         /* Broadcast packets are reported as ACK_COMPLETE, so this
 591          * check is sufficient to ensure we don't send response to
 592          * broadcast packets or posted writes. */
 593         if (request->ack != ACK_PENDING)
 594                 return;
 595
 596         if (rcode == RCODE_COMPLETE)
 597                 fw_fill_response(&request->response, request->request_header,
 598                                  rcode, request->data, request->length);
 599         else
 600                 fw_fill_response(&request->response, request->request_header,
 601                                  rcode, NULL, 0);
 602
 603         card->driver->send_response(card, &request->response);
 604 }
 605 EXPORT_SYMBOL(fw_send_response);
 606
 607 void
 608 fw_core_handle_request(struct fw_card *card, struct fw_packet *p)
 609 {
 610         struct fw_address_handler *handler;
 611         struct fw_request *request;
 612         unsigned long long offset;
 613         unsigned long flags;
 614         int tcode, destination, source;
 615
 616         if (p->payload_length > 2048) {
 617                 /* FIXME: send error response. */
 618                 return;
 619         }
 620
 621         if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE)
 622                 return;
 623
 624         request = allocate_request(p);
 625         if (request == NULL) {
 626                 /* FIXME: send statically allocated busy packet. */
 627                 return;
 628         }
 629
 630         offset      =
 631                 ((unsigned long long)
 632                  header_get_offset_high(p->header[1]) << 32) | p->header[2];
 633         tcode       = header_get_tcode(p->header[0]);
 634         destination = header_get_destination(p->header[0]);
 635         source      = header_get_source(p->header[0]);
 636
 637         spin_lock_irqsave(&address_handler_lock, flags);
 638         handler = lookup_enclosing_address_handler(&address_handler_list,
 639                                                    offset, request->length);
 640         spin_unlock_irqrestore(&address_handler_lock, flags);
 641
 642         /* FIXME: lookup the fw_node corresponding to the sender of
 643          * this request and pass that to the address handler instead
 644          * of the node ID.  We may also want to move the address
 645          * allocations to fw_node so we only do this callback if the
 646          * upper layers registered it for this node. */
 647
 648         if (handler == NULL)
 649                 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
 650         else
 651                 handler->address_callback(card, request,
 652                                           tcode, destination, source,
 653                                           p->generation, p->speed, offset,
 654                                           request->data, request->length,
 655                                           handler->callback_data);
 656 }
 657 EXPORT_SYMBOL(fw_core_handle_request);
 658
 659 void
 660 fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
 661 {
 662         struct fw_transaction *t;
 663         unsigned long flags;
 664         u32 *data;
 665         size_t data_length;
 666         int tcode, tlabel, destination, source, rcode;
 667
 668         tcode       = header_get_tcode(p->header[0]);
 669         tlabel      = header_get_tlabel(p->header[0]);
 670         destination = header_get_destination(p->header[0]);
 671         source      = header_get_source(p->header[1]);
 672         rcode       = header_get_rcode(p->header[1]);
 673
 674         spin_lock_irqsave(&card->lock, flags);
 675         list_for_each_entry(t, &card->transaction_list, link) {
 676                 if (t->node_id == source && t->tlabel == tlabel) {
 677                         list_del(&t->link);
 678                         card->tlabel_mask &= ~(1 << t->tlabel);
 679                         break;
 680                 }
 681         }
 682         spin_unlock_irqrestore(&card->lock, flags);
 683
 684         if (&t->link == &card->transaction_list) {
 685                 fw_notify("Unsolicited response (source %x, tlabel %x)\n",
 686                           source, tlabel);
 687                 return;
 688         }
 689
 690         /* FIXME: sanity check packet, is length correct, does tcodes
 691          * and addresses match. */
 692
 693         switch (tcode) {
 694         case TCODE_READ_QUADLET_RESPONSE:
 695                 data = (u32 *) &p->header[3];
 696                 data_length = 4;
 697                 break;
 698
 699         case TCODE_WRITE_RESPONSE:
 700                 data = NULL;
 701                 data_length = 0;
 702                 break;
 703
 704         case TCODE_READ_BLOCK_RESPONSE:
 705         case TCODE_LOCK_RESPONSE:
 706                 data = p->payload;
 707                 data_length = header_get_data_length(p->header[3]);
 708                 break;
 709
 710         default:
 711                 /* Should never happen, this is just to shut up gcc. */
 712                 data = NULL;
 713                 data_length = 0;
 714                 break;
 715         }
 716
 717         t->callback(card, rcode, data, data_length, t->callback_data);
 718 }
 719 EXPORT_SYMBOL(fw_core_handle_response);
 720
 721 const struct fw_address_region topology_map_region =
 722         { .start = 0xfffff0001000ull, .end = 0xfffff0001400ull, };
 723
 724 static void
 725 handle_topology_map(struct fw_card *card, struct fw_request *request,
 726                     int tcode, int destination, int source,
 727                     int generation, int speed,
 728                     unsigned long long offset,
 729                     void *payload, size_t length, void *callback_data)
 730 {
 731         int i, start, end;
 732         u32 *map;
 733
 734         if (!TCODE_IS_READ_REQUEST(tcode)) {
 735                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 736                 return;
 737         }
 738
 739         if ((offset & 3) > 0 || (length & 3) > 0) {
 740                 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
 741                 return;
 742         }
 743
 744         start = (offset - topology_map_region.start) / 4;
 745         end = start + length / 4;
 746         map = payload;
 747
 748         for (i = 0; i < length / 4; i++)
 749                 map[i] = cpu_to_be32(card->topology_map[start + i]);
 750
 751         fw_send_response(card, request, RCODE_COMPLETE);
 752 }
 753
 754 static struct fw_address_handler topology_map = {
 755         .length                 = 0x200,
 756         .address_callback       = handle_topology_map,
 757 };
 758
 759 const struct fw_address_region registers_region =
 760         { .start = 0xfffff0000000ull, .end = 0xfffff0000400ull, };
 761
 762 static void
 763 handle_registers(struct fw_card *card, struct fw_request *request,
 764                  int tcode, int destination, int source,
 765                  int generation, int speed,
 766                  unsigned long long offset,
 767                  void *payload, size_t length, void *callback_data)
 768 {
 769         int reg = offset - CSR_REGISTER_BASE;
 770         unsigned long long bus_time;
 771         __be32 *data = payload;
 772
 773         switch (reg) {
 774         case CSR_CYCLE_TIME:
 775         case CSR_BUS_TIME:
 776                 if (!TCODE_IS_READ_REQUEST(tcode) || length != 4) {
 777                         fw_send_response(card, request, RCODE_TYPE_ERROR);
 778                         break;
 779                 }
 780
 781                 bus_time = card->driver->get_bus_time(card);
 782                 if (reg == CSR_CYCLE_TIME)
 783                         *data = cpu_to_be32(bus_time);
 784                 else
 785                         *data = cpu_to_be32(bus_time >> 25);
 786                 fw_send_response(card, request, RCODE_COMPLETE);
 787                 break;
 788
 789         case CSR_BUS_MANAGER_ID:
 790         case CSR_BANDWIDTH_AVAILABLE:
 791         case CSR_CHANNELS_AVAILABLE_HI:
 792         case CSR_CHANNELS_AVAILABLE_LO:
 793                 /* FIXME: these are handled by the OHCI hardware and
 794                  * the stack never sees these request. If we add
 795                  * support for a new type of controller that doesn't
 796                  * handle this in hardware we need to deal with these
 797                  * transactions. */
 798                 BUG();
 799                 break;
 800
 801         case CSR_BUSY_TIMEOUT:
 802                 /* FIXME: Implement this. */
 803         default:
 804                 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
 805                 break;
 806         }
 807 }
 808
 809 static struct fw_address_handler registers = {
 810         .length                 = 0x400,
 811         .address_callback       = handle_registers,
 812 };
 813
 814 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
 815 MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
 816 MODULE_LICENSE("GPL");
 817
 818 static const u32 vendor_textual_descriptor[] = {
 819         /* textual descriptor leaf () */
 820         0x00060000,
 821         0x00000000,
 822         0x00000000,
 823         0x4c696e75,             /* L i n u */
 824         0x78204669,             /* x   F i */
 825         0x72657769,             /* r e w i */
 826         0x72650000,             /* r e     */
 827 };
 828
 829 static const u32 model_textual_descriptor[] = {
 830         /* model descriptor leaf () */
 831         0x00030000,
 832         0x00000000,
 833         0x00000000,
 834         0x4a756a75,             /* J u j u */
 835 };
 836
 837 static struct fw_descriptor vendor_id_descriptor = {
 838         .length = ARRAY_SIZE(vendor_textual_descriptor),
 839         .immediate = 0x03d00d1e,
 840         .key = 0x81000000,
 841         .data = vendor_textual_descriptor,
 842 };
 843
 844 static struct fw_descriptor model_id_descriptor = {
 845         .length = ARRAY_SIZE(model_textual_descriptor),
 846         .immediate = 0x17000001,
 847         .key = 0x81000000,
 848         .data = model_textual_descriptor,
 849 };
 850
 851 static int __init fw_core_init(void)
 852 {
 853         int retval;
 854
 855         retval = bus_register(&fw_bus_type);
 856         if (retval < 0)
 857                 return retval;
 858
 859         fw_cdev_major = register_chrdev(0, "firewire", &fw_device_ops);
 860         if (fw_cdev_major < 0) {
 861                 bus_unregister(&fw_bus_type);
 862                 return fw_cdev_major;
 863         }
 864
 865         retval = fw_core_add_address_handler(&topology_map,
 866                                              &topology_map_region);
 867         BUG_ON(retval < 0);
 868
 869         retval = fw_core_add_address_handler(&registers,
 870                                              &registers_region);
 871         BUG_ON(retval < 0);
 872
 873         /* Add the vendor textual descriptor. */
 874         retval = fw_core_add_descriptor(&vendor_id_descriptor);
 875         BUG_ON(retval < 0);
 876         retval = fw_core_add_descriptor(&model_id_descriptor);
 877         BUG_ON(retval < 0);
 878
 879         return 0;
 880 }
 881
 882 static void __exit fw_core_cleanup(void)
 883 {
 884         unregister_chrdev(fw_cdev_major, "firewire");
 885         bus_unregister(&fw_bus_type);
 886 }
 887
 888 module_init(fw_core_init);
 889 module_exit(fw_core_cleanup);