drivers/firewire/core-card.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
fw_compute_block_crc
generate_config_rom
update_config_roms
required_space
fw_core_add_descriptor
fw_core_remove_descriptor
reset_bus
fw_schedule_bus_reset
br_work
allocate_broadcast_channel
fw_schedule_bm_work
bm_work
fw_card_initialize
fw_card_add
dummy_read_phy_reg
dummy_update_phy_reg
dummy_send_request
dummy_send_response
dummy_cancel_packet
dummy_enable_phys_dma
dummy_allocate_iso_context
dummy_start_iso
dummy_set_iso_channels
dummy_queue_iso
dummy_flush_queue_iso
dummy_flush_iso_completions
fw_card_release
fw_core_remove_card
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
   4  */
   5 
   6 #include <linux/bug.h>
   7 #include <linux/completion.h>
   8 #include <linux/crc-itu-t.h>
   9 #include <linux/device.h>
  10 #include <linux/errno.h>
  11 #include <linux/firewire.h>
  12 #include <linux/firewire-constants.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/kernel.h>
  15 #include <linux/kref.h>
  16 #include <linux/list.h>
  17 #include <linux/module.h>
  18 #include <linux/mutex.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/workqueue.h>
  21 
  22 #include <linux/atomic.h>
  23 #include <asm/byteorder.h>
  24 
  25 #include "core.h"
  26 
  27 #define define_fw_printk_level(func, kern_level)                \
  28 void func(const struct fw_card *card, const char *fmt, ...)     \
  29 {                                                               \
  30         struct va_format vaf;                                   \
  31         va_list args;                                           \
  32                                                                 \
  33         va_start(args, fmt);                                    \
  34         vaf.fmt = fmt;                                          \
  35         vaf.va = &args;                                         \
  36         printk(kern_level KBUILD_MODNAME " %s: %pV",            \
  37                dev_name(card->device), &vaf);                   \
  38         va_end(args);                                           \
  39 }
  40 define_fw_printk_level(fw_err, KERN_ERR);
  41 define_fw_printk_level(fw_notice, KERN_NOTICE);
  42 
  43 int fw_compute_block_crc(__be32 *block)
  44 {
  45         int length;
  46         u16 crc;
  47 
  48         length = (be32_to_cpu(block[0]) >> 16) & 0xff;
  49         crc = crc_itu_t(0, (u8 *)&block[1], length * 4);
  50         *block |= cpu_to_be32(crc);
  51 
  52         return length;
  53 }
  54 
  55 static DEFINE_MUTEX(card_mutex);
  56 static LIST_HEAD(card_list);
  57 
  58 static LIST_HEAD(descriptor_list);
  59 static int descriptor_count;
  60 
  61 static __be32 tmp_config_rom[256];
  62 /* ROM header, bus info block, root dir header, capabilities = 7 quadlets */
  63 static size_t config_rom_length = 1 + 4 + 1 + 1;
  64 
  65 #define BIB_CRC(v)              ((v) <<  0)
  66 #define BIB_CRC_LENGTH(v)       ((v) << 16)
  67 #define BIB_INFO_LENGTH(v)      ((v) << 24)
  68 #define BIB_BUS_NAME            0x31333934 /* "1394" */
  69 #define BIB_LINK_SPEED(v)       ((v) <<  0)
  70 #define BIB_GENERATION(v)       ((v) <<  4)
  71 #define BIB_MAX_ROM(v)          ((v) <<  8)
  72 #define BIB_MAX_RECEIVE(v)      ((v) << 12)
  73 #define BIB_CYC_CLK_ACC(v)      ((v) << 16)
  74 #define BIB_PMC                 ((1) << 27)
  75 #define BIB_BMC                 ((1) << 28)
  76 #define BIB_ISC                 ((1) << 29)
  77 #define BIB_CMC                 ((1) << 30)
  78 #define BIB_IRMC                ((1) << 31)
  79 #define NODE_CAPABILITIES       0x0c0083c0 /* per IEEE 1394 clause 8.3.2.6.5.2 */
  80 
  81 /*
  82  * IEEE-1394 specifies a default SPLIT_TIMEOUT value of 800 cycles (100 ms),
  83  * but we have to make it longer because there are many devices whose firmware
  84  * is just too slow for that.
  85  */
  86 #define DEFAULT_SPLIT_TIMEOUT   (2 * 8000)
  87 
  88 #define CANON_OUI               0x000085
  89 
  90 static void generate_config_rom(struct fw_card *card, __be32 *config_rom)
  91 {
  92         struct fw_descriptor *desc;
  93         int i, j, k, length;
  94 
  95         /*
  96          * Initialize contents of config rom buffer.  On the OHCI
  97          * controller, block reads to the config rom accesses the host
  98          * memory, but quadlet read access the hardware bus info block
  99          * registers.  That's just crack, but it means we should make
 100          * sure the contents of bus info block in host memory matches
 101          * the version stored in the OHCI registers.
 102          */
 103 
 104         config_rom[0] = cpu_to_be32(
 105                 BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0));
 106         config_rom[1] = cpu_to_be32(BIB_BUS_NAME);
 107         config_rom[2] = cpu_to_be32(
 108                 BIB_LINK_SPEED(card->link_speed) |
 109                 BIB_GENERATION(card->config_rom_generation++ % 14 + 2) |
 110                 BIB_MAX_ROM(2) |
 111                 BIB_MAX_RECEIVE(card->max_receive) |
 112                 BIB_BMC | BIB_ISC | BIB_CMC | BIB_IRMC);
 113         config_rom[3] = cpu_to_be32(card->guid >> 32);
 114         config_rom[4] = cpu_to_be32(card->guid);
 115 
 116         /* Generate root directory. */
 117         config_rom[6] = cpu_to_be32(NODE_CAPABILITIES);
 118         i = 7;
 119         j = 7 + descriptor_count;
 120 
 121         /* Generate root directory entries for descriptors. */
 122         list_for_each_entry (desc, &descriptor_list, link) {
 123                 if (desc->immediate > 0)
 124                         config_rom[i++] = cpu_to_be32(desc->immediate);
 125                 config_rom[i] = cpu_to_be32(desc->key | (j - i));
 126                 i++;
 127                 j += desc->length;
 128         }
 129 
 130         /* Update root directory length. */
 131         config_rom[5] = cpu_to_be32((i - 5 - 1) << 16);
 132 
 133         /* End of root directory, now copy in descriptors. */
 134         list_for_each_entry (desc, &descriptor_list, link) {
 135                 for (k = 0; k < desc->length; k++)
 136                         config_rom[i + k] = cpu_to_be32(desc->data[k]);
 137                 i += desc->length;
 138         }
 139 
 140         /* Calculate CRCs for all blocks in the config rom.  This
 141          * assumes that CRC length and info length are identical for
 142          * the bus info block, which is always the case for this
 143          * implementation. */
 144         for (i = 0; i < j; i += length + 1)
 145                 length = fw_compute_block_crc(config_rom + i);
 146 
 147         WARN_ON(j != config_rom_length);
 148 }
 149 
 150 static void update_config_roms(void)
 151 {
 152         struct fw_card *card;
 153 
 154         list_for_each_entry (card, &card_list, link) {
 155                 generate_config_rom(card, tmp_config_rom);
 156                 card->driver->set_config_rom(card, tmp_config_rom,
 157                                              config_rom_length);
 158         }
 159 }
 160 
 161 static size_t required_space(struct fw_descriptor *desc)
 162 {
 163         /* descriptor + entry into root dir + optional immediate entry */
 164         return desc->length + 1 + (desc->immediate > 0 ? 1 : 0);
 165 }
 166 
 167 int fw_core_add_descriptor(struct fw_descriptor *desc)
 168 {
 169         size_t i;
 170         int ret;
 171 
 172         /*
 173          * Check descriptor is valid; the length of all blocks in the
 174          * descriptor has to add up to exactly the length of the
 175          * block.
 176          */
 177         i = 0;
 178         while (i < desc->length)
 179                 i += (desc->data[i] >> 16) + 1;
 180 
 181         if (i != desc->length)
 182                 return -EINVAL;
 183 
 184         mutex_lock(&card_mutex);
 185 
 186         if (config_rom_length + required_space(desc) > 256) {
 187                 ret = -EBUSY;
 188         } else {
 189                 list_add_tail(&desc->link, &descriptor_list);
 190                 config_rom_length += required_space(desc);
 191                 descriptor_count++;
 192                 if (desc->immediate > 0)
 193                         descriptor_count++;
 194                 update_config_roms();
 195                 ret = 0;
 196         }
 197 
 198         mutex_unlock(&card_mutex);
 199 
 200         return ret;
 201 }
 202 EXPORT_SYMBOL(fw_core_add_descriptor);
 203 
 204 void fw_core_remove_descriptor(struct fw_descriptor *desc)
 205 {
 206         mutex_lock(&card_mutex);
 207 
 208         list_del(&desc->link);
 209         config_rom_length -= required_space(desc);
 210         descriptor_count--;
 211         if (desc->immediate > 0)
 212                 descriptor_count--;
 213         update_config_roms();
 214 
 215         mutex_unlock(&card_mutex);
 216 }
 217 EXPORT_SYMBOL(fw_core_remove_descriptor);
 218 
 219 static int reset_bus(struct fw_card *card, bool short_reset)
 220 {
 221         int reg = short_reset ? 5 : 1;
 222         int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET;
 223 
 224         return card->driver->update_phy_reg(card, reg, 0, bit);
 225 }
 226 
 227 void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset)
 228 {
 229         /* We don't try hard to sort out requests of long vs. short resets. */
 230         card->br_short = short_reset;
 231 
 232         /* Use an arbitrary short delay to combine multiple reset requests. */
 233         fw_card_get(card);
 234         if (!queue_delayed_work(fw_workqueue, &card->br_work,
 235                                 delayed ? DIV_ROUND_UP(HZ, 100) : 0))
 236                 fw_card_put(card);
 237 }
 238 EXPORT_SYMBOL(fw_schedule_bus_reset);
 239 
 240 static void br_work(struct work_struct *work)
 241 {
 242         struct fw_card *card = container_of(work, struct fw_card, br_work.work);
 243 
 244         /* Delay for 2s after last reset per IEEE 1394 clause 8.2.1. */
 245         if (card->reset_jiffies != 0 &&
 246             time_before64(get_jiffies_64(), card->reset_jiffies + 2 * HZ)) {
 247                 if (!queue_delayed_work(fw_workqueue, &card->br_work, 2 * HZ))
 248                         fw_card_put(card);
 249                 return;
 250         }
 251 
 252         fw_send_phy_config(card, FW_PHY_CONFIG_NO_NODE_ID, card->generation,
 253                            FW_PHY_CONFIG_CURRENT_GAP_COUNT);
 254         reset_bus(card, card->br_short);
 255         fw_card_put(card);
 256 }
 257 
 258 static void allocate_broadcast_channel(struct fw_card *card, int generation)
 259 {
 260         int channel, bandwidth = 0;
 261 
 262         if (!card->broadcast_channel_allocated) {
 263                 fw_iso_resource_manage(card, generation, 1ULL << 31,
 264                                        &channel, &bandwidth, true);
 265                 if (channel != 31) {
 266                         fw_notice(card, "failed to allocate broadcast channel\n");
 267                         return;
 268                 }
 269                 card->broadcast_channel_allocated = true;
 270         }
 271 
 272         device_for_each_child(card->device, (void *)(long)generation,
 273                               fw_device_set_broadcast_channel);
 274 }
 275 
 276 static const char gap_count_table[] = {
 277         63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
 278 };
 279 
 280 void fw_schedule_bm_work(struct fw_card *card, unsigned long delay)
 281 {
 282         fw_card_get(card);
 283         if (!schedule_delayed_work(&card->bm_work, delay))
 284                 fw_card_put(card);
 285 }
 286 
 287 static void bm_work(struct work_struct *work)
 288 {
 289         struct fw_card *card = container_of(work, struct fw_card, bm_work.work);
 290         struct fw_device *root_device, *irm_device;
 291         struct fw_node *root_node;
 292         int root_id, new_root_id, irm_id, bm_id, local_id;
 293         int gap_count, generation, grace, rcode;
 294         bool do_reset = false;
 295         bool root_device_is_running;
 296         bool root_device_is_cmc;
 297         bool irm_is_1394_1995_only;
 298         bool keep_this_irm;
 299         __be32 transaction_data[2];
 300 
 301         spin_lock_irq(&card->lock);
 302 
 303         if (card->local_node == NULL) {
 304                 spin_unlock_irq(&card->lock);
 305                 goto out_put_card;
 306         }
 307 
 308         generation = card->generation;
 309 
 310         root_node = card->root_node;
 311         fw_node_get(root_node);
 312         root_device = root_node->data;
 313         root_device_is_running = root_device &&
 314                         atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
 315         root_device_is_cmc = root_device && root_device->cmc;
 316 
 317         irm_device = card->irm_node->data;
 318         irm_is_1394_1995_only = irm_device && irm_device->config_rom &&
 319                         (irm_device->config_rom[2] & 0x000000f0) == 0;
 320 
 321         /* Canon MV5i works unreliably if it is not root node. */
 322         keep_this_irm = irm_device && irm_device->config_rom &&
 323                         irm_device->config_rom[3] >> 8 == CANON_OUI;
 324 
 325         root_id  = root_node->node_id;
 326         irm_id   = card->irm_node->node_id;
 327         local_id = card->local_node->node_id;
 328 
 329         grace = time_after64(get_jiffies_64(),
 330                              card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
 331 
 332         if ((is_next_generation(generation, card->bm_generation) &&
 333              !card->bm_abdicate) ||
 334             (card->bm_generation != generation && grace)) {
 335                 /*
 336                  * This first step is to figure out who is IRM and
 337                  * then try to become bus manager.  If the IRM is not
 338                  * well defined (e.g. does not have an active link
 339                  * layer or does not responds to our lock request, we
 340                  * will have to do a little vigilante bus management.
 341                  * In that case, we do a goto into the gap count logic
 342                  * so that when we do the reset, we still optimize the
 343                  * gap count.  That could well save a reset in the
 344                  * next generation.
 345                  */
 346 
 347                 if (!card->irm_node->link_on) {
 348                         new_root_id = local_id;
 349                         fw_notice(card, "%s, making local node (%02x) root\n",
 350                                   "IRM has link off", new_root_id);
 351                         goto pick_me;
 352                 }
 353 
 354                 if (irm_is_1394_1995_only && !keep_this_irm) {
 355                         new_root_id = local_id;
 356                         fw_notice(card, "%s, making local node (%02x) root\n",
 357                                   "IRM is not 1394a compliant", new_root_id);
 358                         goto pick_me;
 359                 }
 360 
 361                 transaction_data[0] = cpu_to_be32(0x3f);
 362                 transaction_data[1] = cpu_to_be32(local_id);
 363 
 364                 spin_unlock_irq(&card->lock);
 365 
 366                 rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
 367                                 irm_id, generation, SCODE_100,
 368                                 CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
 369                                 transaction_data, 8);
 370 
 371                 if (rcode == RCODE_GENERATION)
 372                         /* Another bus reset, BM work has been rescheduled. */
 373                         goto out;
 374 
 375                 bm_id = be32_to_cpu(transaction_data[0]);
 376 
 377                 spin_lock_irq(&card->lock);
 378                 if (rcode == RCODE_COMPLETE && generation == card->generation)
 379                         card->bm_node_id =
 380                             bm_id == 0x3f ? local_id : 0xffc0 | bm_id;
 381                 spin_unlock_irq(&card->lock);
 382 
 383                 if (rcode == RCODE_COMPLETE && bm_id != 0x3f) {
 384                         /* Somebody else is BM.  Only act as IRM. */
 385                         if (local_id == irm_id)
 386                                 allocate_broadcast_channel(card, generation);
 387 
 388                         goto out;
 389                 }
 390 
 391                 if (rcode == RCODE_SEND_ERROR) {
 392                         /*
 393                          * We have been unable to send the lock request due to
 394                          * some local problem.  Let's try again later and hope
 395                          * that the problem has gone away by then.
 396                          */
 397                         fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
 398                         goto out;
 399                 }
 400 
 401                 spin_lock_irq(&card->lock);
 402 
 403                 if (rcode != RCODE_COMPLETE && !keep_this_irm) {
 404                         /*
 405                          * The lock request failed, maybe the IRM
 406                          * isn't really IRM capable after all. Let's
 407                          * do a bus reset and pick the local node as
 408                          * root, and thus, IRM.
 409                          */
 410                         new_root_id = local_id;
 411                         fw_notice(card, "BM lock failed (%s), making local node (%02x) root\n",
 412                                   fw_rcode_string(rcode), new_root_id);
 413                         goto pick_me;
 414                 }
 415         } else if (card->bm_generation != generation) {
 416                 /*
 417                  * We weren't BM in the last generation, and the last
 418                  * bus reset is less than 125ms ago.  Reschedule this job.
 419                  */
 420                 spin_unlock_irq(&card->lock);
 421                 fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
 422                 goto out;
 423         }
 424 
 425         /*
 426          * We're bus manager for this generation, so next step is to
 427          * make sure we have an active cycle master and do gap count
 428          * optimization.
 429          */
 430         card->bm_generation = generation;
 431 
 432         if (root_device == NULL) {
 433                 /*
 434                  * Either link_on is false, or we failed to read the
 435                  * config rom.  In either case, pick another root.
 436                  */
 437                 new_root_id = local_id;
 438         } else if (!root_device_is_running) {
 439                 /*
 440                  * If we haven't probed this device yet, bail out now
 441                  * and let's try again once that's done.
 442                  */
 443                 spin_unlock_irq(&card->lock);
 444                 goto out;
 445         } else if (root_device_is_cmc) {
 446                 /*
 447                  * We will send out a force root packet for this
 448                  * node as part of the gap count optimization.
 449                  */
 450                 new_root_id = root_id;
 451         } else {
 452                 /*
 453                  * Current root has an active link layer and we
 454                  * successfully read the config rom, but it's not
 455                  * cycle master capable.
 456                  */
 457                 new_root_id = local_id;
 458         }
 459 
 460  pick_me:
 461         /*
 462          * Pick a gap count from 1394a table E-1.  The table doesn't cover
 463          * the typically much larger 1394b beta repeater delays though.
 464          */
 465         if (!card->beta_repeaters_present &&
 466             root_node->max_hops < ARRAY_SIZE(gap_count_table))
 467                 gap_count = gap_count_table[root_node->max_hops];
 468         else
 469                 gap_count = 63;
 470 
 471         /*
 472          * Finally, figure out if we should do a reset or not.  If we have
 473          * done less than 5 resets with the same physical topology and we
 474          * have either a new root or a new gap count setting, let's do it.
 475          */
 476 
 477         if (card->bm_retries++ < 5 &&
 478             (card->gap_count != gap_count || new_root_id != root_id))
 479                 do_reset = true;
 480 
 481         spin_unlock_irq(&card->lock);
 482 
 483         if (do_reset) {
 484                 fw_notice(card, "phy config: new root=%x, gap_count=%d\n",
 485                           new_root_id, gap_count);
 486                 fw_send_phy_config(card, new_root_id, generation, gap_count);
 487                 reset_bus(card, true);
 488                 /* Will allocate broadcast channel after the reset. */
 489                 goto out;
 490         }
 491 
 492         if (root_device_is_cmc) {
 493                 /*
 494                  * Make sure that the cycle master sends cycle start packets.
 495                  */
 496                 transaction_data[0] = cpu_to_be32(CSR_STATE_BIT_CMSTR);
 497                 rcode = fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
 498                                 root_id, generation, SCODE_100,
 499                                 CSR_REGISTER_BASE + CSR_STATE_SET,
 500                                 transaction_data, 4);
 501                 if (rcode == RCODE_GENERATION)
 502                         goto out;
 503         }
 504 
 505         if (local_id == irm_id)
 506                 allocate_broadcast_channel(card, generation);
 507 
 508  out:
 509         fw_node_put(root_node);
 510  out_put_card:
 511         fw_card_put(card);
 512 }
 513 
 514 void fw_card_initialize(struct fw_card *card,
 515                         const struct fw_card_driver *driver,
 516                         struct device *device)
 517 {
 518         static atomic_t index = ATOMIC_INIT(-1);
 519 
 520         card->index = atomic_inc_return(&index);
 521         card->driver = driver;
 522         card->device = device;
 523         card->current_tlabel = 0;
 524         card->tlabel_mask = 0;
 525         card->split_timeout_hi = DEFAULT_SPLIT_TIMEOUT / 8000;
 526         card->split_timeout_lo = (DEFAULT_SPLIT_TIMEOUT % 8000) << 19;
 527         card->split_timeout_cycles = DEFAULT_SPLIT_TIMEOUT;
 528         card->split_timeout_jiffies =
 529                         DIV_ROUND_UP(DEFAULT_SPLIT_TIMEOUT * HZ, 8000);
 530         card->color = 0;
 531         card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
 532 
 533         kref_init(&card->kref);
 534         init_completion(&card->done);
 535         INIT_LIST_HEAD(&card->transaction_list);
 536         INIT_LIST_HEAD(&card->phy_receiver_list);
 537         spin_lock_init(&card->lock);
 538 
 539         card->local_node = NULL;
 540 
 541         INIT_DELAYED_WORK(&card->br_work, br_work);
 542         INIT_DELAYED_WORK(&card->bm_work, bm_work);
 543 }
 544 EXPORT_SYMBOL(fw_card_initialize);
 545 
 546 int fw_card_add(struct fw_card *card,
 547                 u32 max_receive, u32 link_speed, u64 guid)
 548 {
 549         int ret;
 550 
 551         card->max_receive = max_receive;
 552         card->link_speed = link_speed;
 553         card->guid = guid;
 554 
 555         mutex_lock(&card_mutex);
 556 
 557         generate_config_rom(card, tmp_config_rom);
 558         ret = card->driver->enable(card, tmp_config_rom, config_rom_length);
 559         if (ret == 0)
 560                 list_add_tail(&card->link, &card_list);
 561 
 562         mutex_unlock(&card_mutex);
 563 
 564         return ret;
 565 }
 566 EXPORT_SYMBOL(fw_card_add);
 567 
 568 /*
 569  * The next few functions implement a dummy driver that is used once a card
 570  * driver shuts down an fw_card.  This allows the driver to cleanly unload,
 571  * as all IO to the card will be handled (and failed) by the dummy driver
 572  * instead of calling into the module.  Only functions for iso context
 573  * shutdown still need to be provided by the card driver.
 574  *
 575  * .read/write_csr() should never be called anymore after the dummy driver
 576  * was bound since they are only used within request handler context.
 577  * .set_config_rom() is never called since the card is taken out of card_list
 578  * before switching to the dummy driver.
 579  */
 580 
 581 static int dummy_read_phy_reg(struct fw_card *card, int address)
 582 {
 583         return -ENODEV;
 584 }
 585 
 586 static int dummy_update_phy_reg(struct fw_card *card, int address,
 587                                 int clear_bits, int set_bits)
 588 {
 589         return -ENODEV;
 590 }
 591 
 592 static void dummy_send_request(struct fw_card *card, struct fw_packet *packet)
 593 {
 594         packet->callback(packet, card, RCODE_CANCELLED);
 595 }
 596 
 597 static void dummy_send_response(struct fw_card *card, struct fw_packet *packet)
 598 {
 599         packet->callback(packet, card, RCODE_CANCELLED);
 600 }
 601 
 602 static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
 603 {
 604         return -ENOENT;
 605 }
 606 
 607 static int dummy_enable_phys_dma(struct fw_card *card,
 608                                  int node_id, int generation)
 609 {
 610         return -ENODEV;
 611 }
 612 
 613 static struct fw_iso_context *dummy_allocate_iso_context(struct fw_card *card,
 614                                 int type, int channel, size_t header_size)
 615 {
 616         return ERR_PTR(-ENODEV);
 617 }
 618 
 619 static int dummy_start_iso(struct fw_iso_context *ctx,
 620                            s32 cycle, u32 sync, u32 tags)
 621 {
 622         return -ENODEV;
 623 }
 624 
 625 static int dummy_set_iso_channels(struct fw_iso_context *ctx, u64 *channels)
 626 {
 627         return -ENODEV;
 628 }
 629 
 630 static int dummy_queue_iso(struct fw_iso_context *ctx, struct fw_iso_packet *p,
 631                            struct fw_iso_buffer *buffer, unsigned long payload)
 632 {
 633         return -ENODEV;
 634 }
 635 
 636 static void dummy_flush_queue_iso(struct fw_iso_context *ctx)
 637 {
 638 }
 639 
 640 static int dummy_flush_iso_completions(struct fw_iso_context *ctx)
 641 {
 642         return -ENODEV;
 643 }
 644 
 645 static const struct fw_card_driver dummy_driver_template = {
 646         .read_phy_reg           = dummy_read_phy_reg,
 647         .update_phy_reg         = dummy_update_phy_reg,
 648         .send_request           = dummy_send_request,
 649         .send_response          = dummy_send_response,
 650         .cancel_packet          = dummy_cancel_packet,
 651         .enable_phys_dma        = dummy_enable_phys_dma,
 652         .allocate_iso_context   = dummy_allocate_iso_context,
 653         .start_iso              = dummy_start_iso,
 654         .set_iso_channels       = dummy_set_iso_channels,
 655         .queue_iso              = dummy_queue_iso,
 656         .flush_queue_iso        = dummy_flush_queue_iso,
 657         .flush_iso_completions  = dummy_flush_iso_completions,
 658 };
 659 
 660 void fw_card_release(struct kref *kref)
 661 {
 662         struct fw_card *card = container_of(kref, struct fw_card, kref);
 663 
 664         complete(&card->done);
 665 }
 666 EXPORT_SYMBOL_GPL(fw_card_release);
 667 
 668 void fw_core_remove_card(struct fw_card *card)
 669 {
 670         struct fw_card_driver dummy_driver = dummy_driver_template;
 671 
 672         card->driver->update_phy_reg(card, 4,
 673                                      PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
 674         fw_schedule_bus_reset(card, false, true);
 675 
 676         mutex_lock(&card_mutex);
 677         list_del_init(&card->link);
 678         mutex_unlock(&card_mutex);
 679 
 680         /* Switch off most of the card driver interface. */
 681         dummy_driver.free_iso_context   = card->driver->free_iso_context;
 682         dummy_driver.stop_iso           = card->driver->stop_iso;
 683         card->driver = &dummy_driver;
 684 
 685         fw_destroy_nodes(card);
 686 
 687         /* Wait for all users, especially device workqueue jobs, to finish. */
 688         fw_card_put(card);
 689         wait_for_completion(&card->done);
 690 
 691         WARN_ON(!list_empty(&card->transaction_list));
 692 }
 693 EXPORT_SYMBOL(fw_core_remove_card);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/firewire/core-card.c

DEFINITIONS
