include/linux/firewire.h

   1 #ifndef _LINUX_FIREWIRE_H
   2 #define _LINUX_FIREWIRE_H
   3
   4 #include <linux/completion.h>
   5 #include <linux/dma-mapping.h>
   6 #include <linux/kernel.h>
   7 #include <linux/kref.h>
   8 #include <linux/list.h>
   9 #include <linux/mutex.h>
  10 #include <linux/spinlock.h>
  11 #include <linux/sysfs.h>
  12 #include <linux/timer.h>
  13 #include <linux/types.h>
  14 #include <linux/workqueue.h>
  15
  16 #include <linux/atomic.h>
  17 #include <asm/byteorder.h>
  18
  19 #define CSR_REGISTER_BASE               0xfffff0000000ULL
  20
  21 /* register offsets are relative to CSR_REGISTER_BASE */
  22 #define CSR_STATE_CLEAR                 0x0
  23 #define CSR_STATE_SET                   0x4
  24 #define CSR_NODE_IDS                    0x8
  25 #define CSR_RESET_START                 0xc
  26 #define CSR_SPLIT_TIMEOUT_HI            0x18
  27 #define CSR_SPLIT_TIMEOUT_LO            0x1c
  28 #define CSR_CYCLE_TIME                  0x200
  29 #define CSR_BUS_TIME                    0x204
  30 #define CSR_BUSY_TIMEOUT                0x210
  31 #define CSR_PRIORITY_BUDGET             0x218
  32 #define CSR_BUS_MANAGER_ID              0x21c
  33 #define CSR_BANDWIDTH_AVAILABLE         0x220
  34 #define CSR_CHANNELS_AVAILABLE          0x224
  35 #define CSR_CHANNELS_AVAILABLE_HI       0x224
  36 #define CSR_CHANNELS_AVAILABLE_LO       0x228
  37 #define CSR_MAINT_UTILITY               0x230
  38 #define CSR_BROADCAST_CHANNEL           0x234
  39 #define CSR_CONFIG_ROM                  0x400
  40 #define CSR_CONFIG_ROM_END              0x800
  41 #define CSR_OMPR                        0x900
  42 #define CSR_OPCR(i)                     (0x904 + (i) * 4)
  43 #define CSR_IMPR                        0x980
  44 #define CSR_IPCR(i)                     (0x984 + (i) * 4)
  45 #define CSR_FCP_COMMAND                 0xB00
  46 #define CSR_FCP_RESPONSE                0xD00
  47 #define CSR_FCP_END                     0xF00
  48 #define CSR_TOPOLOGY_MAP                0x1000
  49 #define CSR_TOPOLOGY_MAP_END            0x1400
  50 #define CSR_SPEED_MAP                   0x2000
  51 #define CSR_SPEED_MAP_END               0x3000
  52
  53 #define CSR_OFFSET              0x40
  54 #define CSR_LEAF                0x80
  55 #define CSR_DIRECTORY           0xc0
  56
  57 #define CSR_DESCRIPTOR          0x01
  58 #define CSR_VENDOR              0x03
  59 #define CSR_HARDWARE_VERSION    0x04
  60 #define CSR_UNIT                0x11
  61 #define CSR_SPECIFIER_ID        0x12
  62 #define CSR_VERSION             0x13
  63 #define CSR_DEPENDENT_INFO      0x14
  64 #define CSR_MODEL               0x17
  65 #define CSR_DIRECTORY_ID        0x20
  66
  67 struct device;
  68
  69 struct fw_csr_iterator {
  70         const u32 *p;
  71         const u32 *end;
  72 };
  73
  74 void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p);
  75 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value);
  76 int fw_csr_string(const u32 *directory, int key, char *buf, size_t size);
  77
  78 extern struct bus_type fw_bus_type;
  79
  80 struct fw_card_driver;
  81 struct fw_node;
  82
  83 struct fw_card {
  84         const struct fw_card_driver *driver;
  85         struct device *device;
  86         struct kref kref;
  87         struct completion done;
  88
  89         int node_id;
  90         int generation;
  91         int current_tlabel;
  92         u64 tlabel_mask;
  93         struct list_head transaction_list;
  94         u64 reset_jiffies;
  95
  96         u32 split_timeout_hi;
  97         u32 split_timeout_lo;
  98         unsigned int split_timeout_cycles;
  99         unsigned int split_timeout_jiffies;
 100
 101         unsigned long long guid;
 102         unsigned max_receive;
 103         int link_speed;
 104         int config_rom_generation;
 105
 106         spinlock_t lock; /* Take this lock when handling the lists in
 107                           * this struct. */
 108         struct fw_node *local_node;
 109         struct fw_node *root_node;
 110         struct fw_node *irm_node;
 111         u8 color; /* must be u8 to match the definition in struct fw_node */
 112         int gap_count;
 113         bool beta_repeaters_present;
 114
 115         int index;
 116         struct list_head link;
 117
 118         struct list_head phy_receiver_list;
 119
 120         struct delayed_work br_work; /* bus reset job */
 121         bool br_short;
 122
 123         struct delayed_work bm_work; /* bus manager job */
 124         int bm_retries;
 125         int bm_generation;
 126         int bm_node_id;
 127         bool bm_abdicate;
 128
 129         bool priority_budget_implemented;       /* controller feature */
 130         bool broadcast_channel_auto_allocated;  /* controller feature */
 131
 132         bool broadcast_channel_allocated;
 133         u32 broadcast_channel;
 134         __be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];
 135
 136         __be32 maint_utility_register;
 137 };
 138
 139 struct fw_attribute_group {
 140         struct attribute_group *groups[2];
 141         struct attribute_group group;
 142         struct attribute *attrs[12];
 143 };
 144
 145 enum fw_device_state {
 146         FW_DEVICE_INITIALIZING,
 147         FW_DEVICE_RUNNING,
 148         FW_DEVICE_GONE,
 149         FW_DEVICE_SHUTDOWN,
 150 };
 151
 152 /*
 153  * Note, fw_device.generation always has to be read before fw_device.node_id.
 154  * Use SMP memory barriers to ensure this.  Otherwise requests will be sent
 155  * to an outdated node_id if the generation was updated in the meantime due
 156  * to a bus reset.
 157  *
 158  * Likewise, fw-core will take care to update .node_id before .generation so
 159  * that whenever fw_device.generation is current WRT the actual bus generation,
 160  * fw_device.node_id is guaranteed to be current too.
 161  *
 162  * The same applies to fw_device.card->node_id vs. fw_device.generation.
 163  *
 164  * fw_device.config_rom and fw_device.config_rom_length may be accessed during
 165  * the lifetime of any fw_unit belonging to the fw_device, before device_del()
 166  * was called on the last fw_unit.  Alternatively, they may be accessed while
 167  * holding fw_device_rwsem.
 168  */
 169 struct fw_device {
 170         atomic_t state;
 171         struct fw_node *node;
 172         int node_id;
 173         int generation;
 174         unsigned max_speed;
 175         struct fw_card *card;
 176         struct device device;
 177
 178         struct mutex client_list_mutex;
 179         struct list_head client_list;
 180
 181         const u32 *config_rom;
 182         size_t config_rom_length;
 183         int config_rom_retries;
 184         unsigned is_local:1;
 185         unsigned max_rec:4;
 186         unsigned cmc:1;
 187         unsigned irmc:1;
 188         unsigned bc_implemented:2;
 189
 190         struct delayed_work work;
 191         struct fw_attribute_group attribute_group;
 192 };
 193
 194 static inline struct fw_device *fw_device(struct device *dev)
 195 {
 196         return container_of(dev, struct fw_device, device);
 197 }
 198
 199 static inline int fw_device_is_shutdown(struct fw_device *device)
 200 {
 201         return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
 202 }
 203
 204 int fw_device_enable_phys_dma(struct fw_device *device);
 205
 206 /*
 207  * fw_unit.directory must not be accessed after device_del(&fw_unit.device).
 208  */
 209 struct fw_unit {
 210         struct device device;
 211         const u32 *directory;
 212         struct fw_attribute_group attribute_group;
 213 };
 214
 215 static inline struct fw_unit *fw_unit(struct device *dev)
 216 {
 217         return container_of(dev, struct fw_unit, device);
 218 }
 219
 220 static inline struct fw_unit *fw_unit_get(struct fw_unit *unit)
 221 {
 222         get_device(&unit->device);
 223
 224         return unit;
 225 }
 226
 227 static inline void fw_unit_put(struct fw_unit *unit)
 228 {
 229         put_device(&unit->device);
 230 }
 231
 232 static inline struct fw_device *fw_parent_device(struct fw_unit *unit)
 233 {
 234         return fw_device(unit->device.parent);
 235 }
 236
 237 struct ieee1394_device_id;
 238
 239 struct fw_driver {
 240         struct device_driver driver;
 241         /* Called when the parent device sits through a bus reset. */
 242         void (*update)(struct fw_unit *unit);
 243         const struct ieee1394_device_id *id_table;
 244 };
 245
 246 struct fw_packet;
 247 struct fw_request;
 248
 249 typedef void (*fw_packet_callback_t)(struct fw_packet *packet,
 250                                      struct fw_card *card, int status);
 251 typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
 252                                           void *data, size_t length,
 253                                           void *callback_data);
 254 /*
 255  * Important note:  Except for the FCP registers, the callback must guarantee
 256  * that either fw_send_response() or kfree() is called on the @request.
 257  */
 258 typedef void (*fw_address_callback_t)(struct fw_card *card,
 259                                       struct fw_request *request,
 260                                       int tcode, int destination, int source,
 261                                       int generation,
 262                                       unsigned long long offset,
 263                                       void *data, size_t length,
 264                                       void *callback_data);
 265
 266 struct fw_packet {
 267         int speed;
 268         int generation;
 269         u32 header[4];
 270         size_t header_length;
 271         void *payload;
 272         size_t payload_length;
 273         dma_addr_t payload_bus;
 274         bool payload_mapped;
 275         u32 timestamp;
 276
 277         /*
 278          * This callback is called when the packet transmission has completed.
 279          * For successful transmission, the status code is the ack received
 280          * from the destination.  Otherwise it is one of the juju-specific
 281          * rcodes:  RCODE_SEND_ERROR, _CANCELLED, _BUSY, _GENERATION, _NO_ACK.
 282          * The callback can be called from tasklet context and thus
 283          * must never block.
 284          */
 285         fw_packet_callback_t callback;
 286         int ack;
 287         struct list_head link;
 288         void *driver_data;
 289 };
 290
 291 struct fw_transaction {
 292         int node_id; /* The generation is implied; it is always the current. */
 293         int tlabel;
 294         struct list_head link;
 295         struct fw_card *card;
 296         bool is_split_transaction;
 297         struct timer_list split_timeout_timer;
 298
 299         struct fw_packet packet;
 300
 301         /*
 302          * The data passed to the callback is valid only during the
 303          * callback.
 304          */
 305         fw_transaction_callback_t callback;
 306         void *callback_data;
 307 };
 308
 309 struct fw_address_handler {
 310         u64 offset;
 311         size_t length;
 312         fw_address_callback_t address_callback;
 313         void *callback_data;
 314         struct list_head link;
 315 };
 316
 317 struct fw_address_region {
 318         u64 start;
 319         u64 end;
 320 };
 321
 322 extern const struct fw_address_region fw_high_memory_region;
 323
 324 int fw_core_add_address_handler(struct fw_address_handler *handler,
 325                                 const struct fw_address_region *region);
 326 void fw_core_remove_address_handler(struct fw_address_handler *handler);
 327 void fw_send_response(struct fw_card *card,
 328                       struct fw_request *request, int rcode);
 329 void fw_send_request(struct fw_card *card, struct fw_transaction *t,
 330                      int tcode, int destination_id, int generation, int speed,
 331                      unsigned long long offset, void *payload, size_t length,
 332                      fw_transaction_callback_t callback, void *callback_data);
 333 int fw_cancel_transaction(struct fw_card *card,
 334                           struct fw_transaction *transaction);
 335 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
 336                        int generation, int speed, unsigned long long offset,
 337                        void *payload, size_t length);
 338
 339 static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
 340 {
 341         return tag << 14 | channel << 8 | sy;
 342 }
 343
 344 struct fw_descriptor {
 345         struct list_head link;
 346         size_t length;
 347         u32 immediate;
 348         u32 key;
 349         const u32 *data;
 350 };
 351
 352 int fw_core_add_descriptor(struct fw_descriptor *desc);
 353 void fw_core_remove_descriptor(struct fw_descriptor *desc);
 354
 355 /*
 356  * The iso packet format allows for an immediate header/payload part
 357  * stored in 'header' immediately after the packet info plus an
 358  * indirect payload part that is pointer to by the 'payload' field.
 359  * Applications can use one or the other or both to implement simple
 360  * low-bandwidth streaming (e.g. audio) or more advanced
 361  * scatter-gather streaming (e.g. assembling video frame automatically).
 362  */
 363 struct fw_iso_packet {
 364         u16 payload_length;     /* Length of indirect payload           */
 365         u32 interrupt:1;        /* Generate interrupt on this packet    */
 366         u32 skip:1;             /* tx: Set to not send packet at all    */
 367                                 /* rx: Sync bit, wait for matching sy   */
 368         u32 tag:2;              /* tx: Tag in packet header             */
 369         u32 sy:4;               /* tx: Sy in packet header              */
 370         u32 header_length:8;    /* Length of immediate header           */
 371         u32 header[0];          /* tx: Top of 1394 isoch. data_block    */
 372 };
 373
 374 #define FW_ISO_CONTEXT_TRANSMIT                 0
 375 #define FW_ISO_CONTEXT_RECEIVE                  1
 376 #define FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL     2
 377
 378 #define FW_ISO_CONTEXT_MATCH_TAG0        1
 379 #define FW_ISO_CONTEXT_MATCH_TAG1        2
 380 #define FW_ISO_CONTEXT_MATCH_TAG2        4
 381 #define FW_ISO_CONTEXT_MATCH_TAG3        8
 382 #define FW_ISO_CONTEXT_MATCH_ALL_TAGS   15
 383
 384 /*
 385  * An iso buffer is just a set of pages mapped for DMA in the
 386  * specified direction.  Since the pages are to be used for DMA, they
 387  * are not mapped into the kernel virtual address space.  We store the
 388  * DMA address in the page private. The helper function
 389  * fw_iso_buffer_map() will map the pages into a given vma.
 390  */
 391 struct fw_iso_buffer {
 392         enum dma_data_direction direction;
 393         struct page **pages;
 394         int page_count;
 395 };
 396
 397 int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
 398                        int page_count, enum dma_data_direction direction);
 399 void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
 400 size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed);
 401
 402 struct fw_iso_context;
 403 typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
 404                                   u32 cycle, size_t header_length,
 405                                   void *header, void *data);
 406 typedef void (*fw_iso_mc_callback_t)(struct fw_iso_context *context,
 407                                      dma_addr_t completed, void *data);
 408 struct fw_iso_context {
 409         struct fw_card *card;
 410         int type;
 411         int channel;
 412         int speed;
 413         size_t header_size;
 414         union {
 415                 fw_iso_callback_t sc;
 416                 fw_iso_mc_callback_t mc;
 417         } callback;
 418         void *callback_data;
 419 };
 420
 421 struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
 422                 int type, int channel, int speed, size_t header_size,
 423                 fw_iso_callback_t callback, void *callback_data);
 424 int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels);
 425 int fw_iso_context_queue(struct fw_iso_context *ctx,
 426                          struct fw_iso_packet *packet,
 427                          struct fw_iso_buffer *buffer,
 428                          unsigned long payload);
 429 void fw_iso_context_queue_flush(struct fw_iso_context *ctx);
 430 int fw_iso_context_flush_completions(struct fw_iso_context *ctx);
 431 int fw_iso_context_start(struct fw_iso_context *ctx,
 432                          int cycle, int sync, int tags);
 433 int fw_iso_context_stop(struct fw_iso_context *ctx);
 434 void fw_iso_context_destroy(struct fw_iso_context *ctx);
 435 void fw_iso_resource_manage(struct fw_card *card, int generation,
 436                             u64 channels_mask, int *channel, int *bandwidth,
 437                             bool allocate);
 438
 439 extern struct workqueue_struct *fw_workqueue;
 440
 441 #endif /* _LINUX_FIREWIRE_H */