1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_FIREWIRE_H 3 #define _LINUX_FIREWIRE_H 4 5 #include <linux/completion.h> 6 #include <linux/device.h> 7 #include <linux/dma-mapping.h> 8 #include <linux/kernel.h> 9 #include <linux/kref.h> 10 #include <linux/list.h> 11 #include <linux/mutex.h> 12 #include <linux/spinlock.h> 13 #include <linux/sysfs.h> 14 #include <linux/timer.h> 15 #include <linux/types.h> 16 #include <linux/workqueue.h> 17 #include <linux/device-id/ieee1394.h> 18 19 #include <linux/atomic.h> 20 #include <asm/byteorder.h> 21 22 #define CSR_REGISTER_BASE 0xfffff0000000ULL 23 24 /* register offsets are relative to CSR_REGISTER_BASE */ 25 #define CSR_STATE_CLEAR 0x0 26 #define CSR_STATE_SET 0x4 27 #define CSR_NODE_IDS 0x8 28 #define CSR_RESET_START 0xc 29 #define CSR_SPLIT_TIMEOUT_HI 0x18 30 #define CSR_SPLIT_TIMEOUT_LO 0x1c 31 #define CSR_CYCLE_TIME 0x200 32 #define CSR_BUS_TIME 0x204 33 #define CSR_BUSY_TIMEOUT 0x210 34 #define CSR_PRIORITY_BUDGET 0x218 35 #define CSR_BUS_MANAGER_ID 0x21c 36 #define CSR_BANDWIDTH_AVAILABLE 0x220 37 #define CSR_CHANNELS_AVAILABLE 0x224 38 #define CSR_CHANNELS_AVAILABLE_HI 0x224 39 #define CSR_CHANNELS_AVAILABLE_LO 0x228 40 #define CSR_MAINT_UTILITY 0x230 41 #define CSR_BROADCAST_CHANNEL 0x234 42 #define CSR_CONFIG_ROM 0x400 43 #define CSR_CONFIG_ROM_END 0x800 44 #define CSR_OMPR 0x900 45 #define CSR_OPCR(i) (0x904 + (i) * 4) 46 #define CSR_IMPR 0x980 47 #define CSR_IPCR(i) (0x984 + (i) * 4) 48 #define CSR_FCP_COMMAND 0xB00 49 #define CSR_FCP_RESPONSE 0xD00 50 #define CSR_FCP_END 0xF00 51 #define CSR_TOPOLOGY_MAP 0x1000 52 #define CSR_TOPOLOGY_MAP_END 0x1400 53 #define CSR_SPEED_MAP 0x2000 54 #define CSR_SPEED_MAP_END 0x3000 55 56 #define CSR_OFFSET 0x40 57 #define CSR_LEAF 0x80 58 #define CSR_DIRECTORY 0xc0 59 60 #define CSR_DESCRIPTOR 0x01 61 #define CSR_VENDOR 0x03 62 #define CSR_HARDWARE_VERSION 0x04 63 #define CSR_UNIT 0x11 64 #define CSR_SPECIFIER_ID 0x12 65 #define CSR_VERSION 0x13 66 #define CSR_DEPENDENT_INFO 0x14 67 #define CSR_MODEL 0x17 68 #define CSR_DIRECTORY_ID 0x20 69 70 struct fw_csr_iterator { 71 const u32 *p; 72 const u32 *end; 73 }; 74 75 void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p); 76 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value); 77 int fw_csr_string(const u32 *directory, int key, char *buf, size_t size); 78 79 extern const struct bus_type fw_bus_type; 80 81 struct fw_card_driver; 82 struct fw_node; 83 84 struct fw_card { 85 const struct fw_card_driver *driver; 86 struct device *device; 87 struct kref kref; 88 struct completion done; 89 90 int node_id; 91 int generation; 92 u64 reset_jiffies; 93 94 struct { 95 int current_tlabel __guarded_by(&lock); 96 u64 tlabel_mask __guarded_by(&lock); 97 struct list_head list __guarded_by(&lock); 98 spinlock_t lock; 99 } transactions; 100 101 struct { 102 u32 hi __guarded_by(&lock); 103 u32 lo __guarded_by(&lock); 104 unsigned int cycles __guarded_by(&lock); 105 unsigned int jiffies __guarded_by(&lock); 106 spinlock_t lock; 107 } split_timeout; 108 109 unsigned long long guid; 110 unsigned max_receive; 111 int link_speed; 112 int config_rom_generation; 113 114 spinlock_t lock; 115 116 struct fw_node *local_node; 117 struct fw_node *root_node; 118 struct fw_node *irm_node; 119 u8 color; /* must be u8 to match the definition in struct fw_node */ 120 int gap_count; 121 bool beta_repeaters_present; 122 123 int index; 124 struct list_head link; 125 126 struct delayed_work br_work; /* bus reset job */ 127 bool br_short; 128 129 struct delayed_work bm_work; /* bus manager job */ 130 int bm_retries; 131 int bm_generation; 132 int bm_node_id; 133 bool bm_abdicate; 134 135 bool priority_budget_implemented; /* controller feature */ 136 bool broadcast_channel_auto_allocated; /* controller feature */ 137 138 bool broadcast_channel_allocated; 139 u32 broadcast_channel; 140 141 struct { 142 __be32 buffer[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4] __guarded_by(&lock); 143 spinlock_t lock; 144 } topology_map; 145 146 __be32 maint_utility_register; 147 148 struct workqueue_struct *isoc_wq; 149 struct workqueue_struct *async_wq; 150 }; 151 152 static inline struct fw_card *fw_card_get(struct fw_card *card) 153 { 154 kref_get(&card->kref); 155 156 return card; 157 } 158 159 void fw_card_release(struct kref *kref); 160 161 static inline void fw_card_put(struct fw_card *card) 162 { 163 kref_put(&card->kref, fw_card_release); 164 } 165 166 int fw_card_read_cycle_time(struct fw_card *card, u32 *cycle_time); 167 168 struct fw_attribute_group { 169 struct attribute_group *groups[2]; 170 struct attribute_group group; 171 struct attribute *attrs[13]; 172 }; 173 174 enum fw_device_quirk { 175 // See 10389536742c ("firewire: core: check for 1394a compliant IRM, fix inaccessibility of Sony camcorder"). 176 FW_DEVICE_QUIRK_IRM_IS_1394_1995_ONLY = BIT(0), 177 178 // See 6044565af458 ("firewire: core: fix unstable I/O with Canon camcorder"). 179 FW_DEVICE_QUIRK_IRM_IGNORES_BUS_MANAGER = BIT(1), 180 181 // MOTU Audio Express transfers acknowledge packet with 0x10 for pending state. 182 FW_DEVICE_QUIRK_ACK_PACKET_WITH_INVALID_PENDING_CODE = BIT(2), 183 184 // TASCAM FW-1082/FW-1804/FW-1884 often freezes when receiving S400 packets. 185 FW_DEVICE_QUIRK_UNSTABLE_AT_S400 = BIT(3), 186 }; 187 188 enum fw_device_state { 189 FW_DEVICE_INITIALIZING, 190 FW_DEVICE_RUNNING, 191 FW_DEVICE_GONE, 192 FW_DEVICE_SHUTDOWN, 193 }; 194 195 /* 196 * Note, fw_device.generation always has to be read before fw_device.node_id. 197 * Use SMP memory barriers to ensure this. Otherwise requests will be sent 198 * to an outdated node_id if the generation was updated in the meantime due 199 * to a bus reset. 200 * 201 * Likewise, fw-core will take care to update .node_id before .generation so 202 * that whenever fw_device.generation is current WRT the actual bus generation, 203 * fw_device.node_id is guaranteed to be current too. 204 * 205 * The same applies to fw_device.card->node_id vs. fw_device.generation. 206 * 207 * fw_device.config_rom and fw_device.config_rom_length may be accessed during 208 * the lifetime of any fw_unit belonging to the fw_device, before device_del() 209 * was called on the last fw_unit. Alternatively, they may be accessed while 210 * holding fw_device_rwsem. 211 */ 212 struct fw_device { 213 atomic_t state; 214 struct fw_node *node; 215 int node_id; 216 int generation; 217 unsigned max_speed; 218 struct fw_card *card; 219 struct device device; 220 221 // A set of enum fw_device_quirk. 222 int quirks; 223 224 struct mutex client_list_mutex; 225 struct list_head client_list; 226 227 const u32 *config_rom __counted_by_ptr(config_rom_length); 228 size_t config_rom_length; 229 int config_rom_retries; 230 unsigned is_local:1; 231 unsigned max_rec:4; 232 unsigned cmc:1; 233 unsigned irmc:1; 234 unsigned bc_implemented:2; 235 236 work_func_t workfn; 237 struct delayed_work work; 238 struct fw_attribute_group attribute_group; 239 }; 240 241 #define fw_device(dev) container_of_const(dev, struct fw_device, device) 242 243 static inline int fw_device_is_shutdown(struct fw_device *device) 244 { 245 return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN; 246 } 247 248 int fw_device_enable_phys_dma(struct fw_device *device); 249 250 /* 251 * fw_unit.directory must not be accessed after device_del(&fw_unit.device). 252 */ 253 struct fw_unit { 254 struct device device; 255 const u32 *directory; 256 struct fw_attribute_group attribute_group; 257 }; 258 259 #define fw_unit(dev) container_of_const(dev, struct fw_unit, device) 260 261 static inline struct fw_unit *fw_unit_get(struct fw_unit *unit) 262 { 263 get_device(&unit->device); 264 265 return unit; 266 } 267 268 static inline void fw_unit_put(struct fw_unit *unit) 269 { 270 put_device(&unit->device); 271 } 272 273 #define fw_parent_device(unit) fw_device(unit->device.parent) 274 275 struct fw_driver { 276 struct device_driver driver; 277 int (*probe)(struct fw_unit *unit, const struct ieee1394_device_id *id); 278 /* Called when the parent device sits through a bus reset. */ 279 void (*update)(struct fw_unit *unit); 280 void (*remove)(struct fw_unit *unit); 281 const struct ieee1394_device_id *id_table; 282 }; 283 284 struct fw_packet; 285 struct fw_request; 286 287 typedef void (*fw_packet_callback_t)(struct fw_packet *packet, 288 struct fw_card *card, int status); 289 290 /** 291 * typedef fw_transaction_callback_t - Function to handle the result of outgoing transaction. 292 * @card: the interface to send the request at 293 * @rcode: the response code 294 * @data: the data for the response subaction 295 * @length: the length of data 296 * @callback_data: the data registered with this callback 297 * 298 * This callback is called from a workqueue in process context after the outgoing transaction is 299 * completed successfully or unsuccessfully. 300 * 301 * Among its parameters is the response code which is either one of the rcodes per IEEE 1394 or, in 302 * case of internal errors, the firewire-core specific %RCODE_SEND_ERROR. The other firewire-core 303 * specific rcodes (%RCODE_CANCELLED, %RCODE_BUSY, %RCODE_GENERATION, %RCODE_NO_ACK) denote 304 * transaction timeout, busy responder, stale request generation, or missing ACK respectively. 305 * 306 * Context: Process context. 307 */ 308 typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode, 309 void *data, size_t length, 310 void *callback_data); 311 312 /** 313 * typedef fw_transaction_callback_with_tstamp_t - Function to handle the result of outgoing 314 * transaction with hardware time stamps. 315 * @card: the interface to send the request at 316 * @rcode: the response code 317 * @request_tstamp: the time stamp at which the request subaction finished 318 * @response_tstamp: the time stamp at which the response subaction finished 319 * @data: the data for the response subaction 320 * @length: the length of data 321 * @callback_data: the data registered with this callback 322 * 323 * This callback is called from a workqueue in process context after the outgoing transaction is 324 * completed successfully or unsuccessfully. 325 * 326 * Among its parameters is the response code which is either one of the rcodes per IEEE 1394 or, in 327 * case of internal errors, the firewire-core specific %RCODE_SEND_ERROR. The other firewire-core 328 * specific rcodes (%RCODE_CANCELLED, %RCODE_BUSY, %RCODE_GENERATION, %RCODE_NO_ACK) denote 329 * transaction timeout, busy responder, stale request generation, or missing ACK respectively. 330 * 331 * The timestamp consists of the low order 3 bits of second field and the full 13 bits of count 332 * field of isochronous cycle time register. 333 * 334 * Context: Process context. 335 */ 336 typedef void (*fw_transaction_callback_with_tstamp_t)(struct fw_card *card, int rcode, 337 u32 request_tstamp, u32 response_tstamp, void *data, 338 size_t length, void *callback_data); 339 340 /** 341 * union fw_transaction_callback - A union to store the outgoing transaction callback. 342 * @without_tstamp: Callback without hardware timestamps. 343 * @with_tstamp: Callback with hardware timestamps. 344 */ 345 union fw_transaction_callback { 346 fw_transaction_callback_t without_tstamp; 347 fw_transaction_callback_with_tstamp_t with_tstamp; 348 }; 349 350 /** 351 * typedef fw_address_callback_t - Function to handle the request of the incoming transaction. 352 * @card: the card instance which receives the request 353 * @request: the request instance. 354 * @tcode: the transaction code 355 * @destination: the destination node ID 356 * @source: the source node ID 357 * @generation: the bus generation in which the request was sent 358 * @offset: the destination offset in source node. 359 * @data: the request content if available. 360 * @length: the length of data. 361 * @callback_data: the data registered with this function. 362 * 363 * This callback handles an inbound request subaction. 364 * 365 * The contents of @request are opaque to the callback. The callback is responsible for calling 366 * fw_send_response() for @request, except for FCP registers, for which the core handles the 367 * response. 368 * 369 * Context: Process context. 370 */ 371 typedef void (*fw_address_callback_t)(struct fw_card *card, 372 struct fw_request *request, 373 int tcode, int destination, int source, 374 int generation, 375 unsigned long long offset, 376 void *data, size_t length, 377 void *callback_data); 378 379 struct fw_packet { 380 int speed; 381 int generation; 382 u32 header[4]; 383 size_t header_length; 384 void *payload __counted_by_ptr(payload_length); 385 size_t payload_length; 386 dma_addr_t payload_bus; 387 bool payload_mapped; 388 u32 timestamp; 389 390 // Used to handle the local-to-local packets in the AT request/response contexts. 391 struct list_head link_for_local; 392 393 /* 394 * This callback is called when the packet transmission has completed. 395 * For successful transmission, the status code is the ack received 396 * from the destination. Otherwise it is one of the juju-specific 397 * rcodes: RCODE_SEND_ERROR, _CANCELLED, _BUSY, _GENERATION, _NO_ACK. 398 * The callback is called from a workqueue. It is not preferable to block it so long. 399 */ 400 fw_packet_callback_t callback; 401 int ack; 402 void *driver_data; 403 }; 404 405 /** 406 * struct fw_transaction - A structure to hold outgoing transaction state. 407 * 408 * All structure members are for internal use only. Once passed to __fw_send_request(), this 409 * structure holds the state of an outgoing transaction. It must not be freed until the callback 410 * reports the transaction result. 411 */ 412 struct fw_transaction { 413 /* private: */ 414 int node_id; /* The generation is implied; it is always the current. */ 415 int tlabel; 416 struct list_head link; 417 struct fw_card *card; 418 bool is_split_transaction; 419 struct timer_list split_timeout_timer; 420 u32 split_timeout_cycle; 421 422 struct fw_packet packet; 423 424 /* 425 * The data passed to the callback is valid only during the 426 * callback. 427 */ 428 union fw_transaction_callback callback; 429 bool with_tstamp; 430 void *callback_data; 431 432 // For some error cases. 433 struct work_struct error_work; 434 int rcode; 435 u32 response_timestamp; 436 }; 437 438 /** 439 * struct fw_address_handler - A handler for incoming transaction requests to a registered address 440 * region. 441 * @offset: The registered offset, available after successful registration. 442 * @length: The length of the address region in bytes, a multiple of a quadlet. 443 * @address_callback: Callback invoked when a transaction request is received for the registered 444 * address region. 445 * @callback_data: Data passed to @address_callback. 446 * 447 * This structure represents a handler registered to receive incoming asynchronous requests to a 448 * specific region of the address space on the local node. 449 */ 450 struct fw_address_handler { 451 u64 offset; 452 u64 length; 453 fw_address_callback_t address_callback; 454 void *callback_data; 455 456 /* private: */ 457 struct list_head link; 458 struct kref kref; 459 struct completion done; 460 }; 461 462 /** 463 * struct fw_address_region - An address range. 464 * @start: The starting offset in bytes, a multiple of a quadlet. 465 * @end: The ending offset in bytes, a multiple of a quadlet. 466 * 467 * Represents a range of addresses in the local node's address space. 468 */ 469 struct fw_address_region { 470 u64 start; 471 u64 end; 472 }; 473 474 extern const struct fw_address_region fw_high_memory_region; 475 476 int fw_core_add_address_handler(struct fw_address_handler *handler, 477 const struct fw_address_region *region); 478 void fw_core_remove_address_handler(struct fw_address_handler *handler); 479 void fw_send_response(struct fw_card *card, 480 struct fw_request *request, int rcode); 481 int fw_get_request_speed(struct fw_request *request); 482 u32 fw_request_get_timestamp(const struct fw_request *request); 483 484 void __fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode, 485 int destination_id, int generation, int speed, unsigned long long offset, 486 void *payload, size_t length, union fw_transaction_callback callback, 487 bool with_tstamp, void *callback_data); 488 489 /** 490 * fw_send_request() - submit a request packet for transmission to generate callback for response 491 * subaction without time stamp. 492 * @card: interface to send the request at 493 * @t: transaction instance to which the request belongs 494 * @tcode: transaction code 495 * @destination_id: destination node ID, consisting of bus_ID and phy_ID 496 * @generation: bus generation in which request and response are valid 497 * @speed: transmission speed 498 * @offset: 48bit wide offset into destination's address space 499 * @payload: data payload for the request subaction 500 * @length: length of the payload, in bytes 501 * @callback: function to be called when the transaction is completed 502 * @callback_data: data to be passed to the transaction completion callback 503 * 504 * A variation of __fw_send_request() to generate callback for response subaction without time 505 * stamp. 506 * 507 * After the transaction is completed successfully or unsuccessfully, the @callback will be called 508 * in process context. 509 * 510 * Context: Any context. 511 */ 512 static inline void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode, 513 int destination_id, int generation, int speed, 514 unsigned long long offset, void *payload, size_t length, 515 fw_transaction_callback_t callback, void *callback_data) 516 { 517 union fw_transaction_callback cb = { 518 .without_tstamp = callback, 519 }; 520 __fw_send_request(card, t, tcode, destination_id, generation, speed, offset, payload, 521 length, cb, false, callback_data); 522 } 523 524 /** 525 * fw_send_request_with_tstamp() - submit a request packet for transmission to generate callback for 526 * response with time stamp. 527 * @card: interface to send the request at 528 * @t: transaction instance to which the request belongs 529 * @tcode: transaction code 530 * @destination_id: destination node ID, consisting of bus_ID and phy_ID 531 * @generation: bus generation in which request and response are valid 532 * @speed: transmission speed 533 * @offset: 48bit wide offset into destination's address space 534 * @payload: data payload for the request subaction 535 * @length: length of the payload, in bytes 536 * @callback: function to be called when the transaction is completed 537 * @callback_data: data to be passed to the transaction completion callback 538 * 539 * A variation of __fw_send_request() to generate callback for response subaction with time stamp. 540 * 541 * After the transaction is completed successfully or unsuccessfully, the @callback will be called 542 * in process context. 543 * 544 * Context: Any context. 545 */ 546 static inline void fw_send_request_with_tstamp(struct fw_card *card, struct fw_transaction *t, 547 int tcode, int destination_id, int generation, int speed, unsigned long long offset, 548 void *payload, size_t length, fw_transaction_callback_with_tstamp_t callback, 549 void *callback_data) 550 { 551 union fw_transaction_callback cb = { 552 .with_tstamp = callback, 553 }; 554 __fw_send_request(card, t, tcode, destination_id, generation, speed, offset, payload, 555 length, cb, true, callback_data); 556 } 557 558 int fw_cancel_transaction(struct fw_card *card, 559 struct fw_transaction *transaction); 560 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id, 561 int generation, int speed, unsigned long long offset, 562 void *payload, size_t length); 563 const char *fw_rcode_string(int rcode); 564 565 static inline int fw_stream_packet_destination_id(int tag, int channel, int sy) 566 { 567 return tag << 14 | channel << 8 | sy; 568 } 569 570 void fw_schedule_bus_reset(struct fw_card *card, bool delayed, 571 bool short_reset); 572 573 struct fw_descriptor { 574 struct list_head link; 575 size_t length; 576 u32 immediate; 577 u32 key; 578 const u32 *data; 579 }; 580 581 int fw_core_add_descriptor(struct fw_descriptor *desc); 582 void fw_core_remove_descriptor(struct fw_descriptor *desc); 583 584 /* 585 * The iso packet format allows for an immediate header/payload part 586 * stored in 'header' immediately after the packet info plus an 587 * indirect payload part that is pointer to by the 'payload' field. 588 * Applications can use one or the other or both to implement simple 589 * low-bandwidth streaming (e.g. audio) or more advanced 590 * scatter-gather streaming (e.g. assembling video frame automatically). 591 */ 592 struct fw_iso_packet { 593 u16 payload_length; /* Length of indirect payload */ 594 u32 interrupt:1; /* Generate interrupt on this packet */ 595 u32 skip:1; /* tx: Set to not send packet at all */ 596 /* rx: Sync bit, wait for matching sy */ 597 u32 tag:2; /* tx: Tag in packet header */ 598 u32 sy:4; /* tx: Sy in packet header */ 599 u32 header_length:8; /* Size of immediate header */ 600 u32 header[]; /* tx: Top of 1394 isoch. data_block */ 601 }; 602 603 #define FW_ISO_CONTEXT_TRANSMIT 0 604 #define FW_ISO_CONTEXT_RECEIVE 1 605 #define FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL 2 606 607 #define FW_ISO_CONTEXT_MATCH_TAG0 1 608 #define FW_ISO_CONTEXT_MATCH_TAG1 2 609 #define FW_ISO_CONTEXT_MATCH_TAG2 4 610 #define FW_ISO_CONTEXT_MATCH_TAG3 8 611 #define FW_ISO_CONTEXT_MATCH_ALL_TAGS 15 612 613 /* 614 * An iso buffer is just a set of pages mapped for DMA in the 615 * specified direction. Since the pages are to be used for DMA, they 616 * are not mapped into the kernel virtual address space. We store the 617 * DMA address in the page private. The helper function 618 * fw_iso_buffer_map() will map the pages into a given vma. 619 */ 620 struct fw_iso_buffer { 621 enum dma_data_direction direction; 622 struct page **pages; 623 dma_addr_t *dma_addrs; 624 int page_count; 625 }; 626 627 int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card, 628 int page_count, enum dma_data_direction direction); 629 void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card); 630 631 struct fw_iso_context; 632 typedef void (*fw_iso_callback_t)(struct fw_iso_context *context, 633 u32 cycle, size_t header_length, 634 void *header, void *data); 635 typedef void (*fw_iso_mc_callback_t)(struct fw_iso_context *context, 636 dma_addr_t completed, void *data); 637 638 union fw_iso_callback { 639 fw_iso_callback_t sc; 640 fw_iso_mc_callback_t mc; 641 }; 642 643 enum fw_iso_context_flag { 644 FW_ISO_CONTEXT_FLAG_DROP_OVERFLOW_HEADERS = BIT(0), 645 }; 646 647 struct fw_iso_context { 648 struct fw_card *card; 649 struct work_struct work; 650 int type; 651 int channel; 652 int speed; 653 int flags; 654 size_t header_size; 655 size_t header_storage_size; 656 union fw_iso_callback callback; 657 void *callback_data; 658 }; 659 660 struct fw_iso_context *__fw_iso_context_create(struct fw_card *card, int type, int channel, 661 int speed, size_t header_size, size_t header_storage_size, 662 union fw_iso_callback callback, void *callback_data); 663 int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels); 664 int fw_iso_context_queue(struct fw_iso_context *ctx, 665 struct fw_iso_packet *packet, 666 struct fw_iso_buffer *buffer, 667 unsigned long payload); 668 void fw_iso_context_queue_flush(struct fw_iso_context *ctx); 669 int fw_iso_context_flush_completions(struct fw_iso_context *ctx); 670 671 static inline struct fw_iso_context *fw_iso_context_create(struct fw_card *card, int type, 672 int channel, int speed, size_t header_size, fw_iso_callback_t callback, 673 void *callback_data) 674 { 675 union fw_iso_callback cb = { .sc = callback }; 676 677 return __fw_iso_context_create(card, type, channel, speed, header_size, PAGE_SIZE, cb, 678 callback_data); 679 } 680 681 static inline struct fw_iso_context *fw_iso_context_create_with_header_storage_size( 682 struct fw_card *card, int type, int channel, int speed, size_t header_size, 683 size_t header_storage_size, fw_iso_callback_t callback, void *callback_data) 684 { 685 union fw_iso_callback cb = { .sc = callback }; 686 687 return __fw_iso_context_create(card, type, channel, speed, header_size, header_storage_size, 688 cb, callback_data); 689 } 690 691 /** 692 * fw_iso_context_schedule_flush_completions() - schedule work item to process isochronous context. 693 * @ctx: the isochronous context 694 * 695 * Schedule a work item on workqueue to process the isochronous context. The registered callback 696 * function is called by the worker when a queued packet buffer with the interrupt flag is 697 * completed, either after transmission in the IT context or after being filled in the IR context. 698 * The callback function is also called when the header buffer in the context becomes full, If it 699 * is required to process the context in the current context, fw_iso_context_flush_completions() is 700 * available instead. 701 * 702 * Context: Any context. 703 */ 704 static inline void fw_iso_context_schedule_flush_completions(struct fw_iso_context *ctx) 705 { 706 queue_work(ctx->card->isoc_wq, &ctx->work); 707 } 708 709 int fw_iso_context_start(struct fw_iso_context *ctx, 710 int cycle, int sync, int tags); 711 int fw_iso_context_stop(struct fw_iso_context *ctx); 712 void fw_iso_context_destroy(struct fw_iso_context *ctx); 713 void fw_iso_resource_manage(struct fw_card *card, int generation, 714 u64 channels_mask, int *channel, int *bandwidth, 715 bool allocate); 716 717 extern struct workqueue_struct *fw_workqueue; 718 719 #endif /* _LINUX_FIREWIRE_H */ 720