include/linux/firewire.h

   1 #ifndef _LINUX_FIREWIRE_H
   2 #define _LINUX_FIREWIRE_H
   3
   4 #include <linux/completion.h>
   5 #include <linux/device.h>
   6 #include <linux/dma-mapping.h>
   7 #include <linux/kernel.h>
   8 #include <linux/kref.h>
   9 #include <linux/list.h>
  10 #include <linux/mutex.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/sysfs.h>
  13 #include <linux/timer.h>
  14 #include <linux/types.h>
  15 #include <linux/workqueue.h>
  16
  17 #include <linux/atomic.h>
  18 #include <asm/byteorder.h>
  19
  20 #define CSR_REGISTER_BASE               0xfffff0000000ULL
  21
  22 /* register offsets are relative to CSR_REGISTER_BASE */
  23 #define CSR_STATE_CLEAR                 0x0
  24 #define CSR_STATE_SET                   0x4
  25 #define CSR_NODE_IDS                    0x8
  26 #define CSR_RESET_START                 0xc
  27 #define CSR_SPLIT_TIMEOUT_HI            0x18
  28 #define CSR_SPLIT_TIMEOUT_LO            0x1c
  29 #define CSR_CYCLE_TIME                  0x200
  30 #define CSR_BUS_TIME                    0x204
  31 #define CSR_BUSY_TIMEOUT                0x210
  32 #define CSR_PRIORITY_BUDGET             0x218
  33 #define CSR_BUS_MANAGER_ID              0x21c
  34 #define CSR_BANDWIDTH_AVAILABLE         0x220
  35 #define CSR_CHANNELS_AVAILABLE          0x224
  36 #define CSR_CHANNELS_AVAILABLE_HI       0x224
  37 #define CSR_CHANNELS_AVAILABLE_LO       0x228
  38 #define CSR_MAINT_UTILITY               0x230
  39 #define CSR_BROADCAST_CHANNEL           0x234
  40 #define CSR_CONFIG_ROM                  0x400
  41 #define CSR_CONFIG_ROM_END              0x800
  42 #define CSR_OMPR                        0x900
  43 #define CSR_OPCR(i)                     (0x904 + (i) * 4)
  44 #define CSR_IMPR                        0x980
  45 #define CSR_IPCR(i)                     (0x984 + (i) * 4)
  46 #define CSR_FCP_COMMAND                 0xB00
  47 #define CSR_FCP_RESPONSE                0xD00
  48 #define CSR_FCP_END                     0xF00
  49 #define CSR_TOPOLOGY_MAP                0x1000
  50 #define CSR_TOPOLOGY_MAP_END            0x1400
  51 #define CSR_SPEED_MAP                   0x2000
  52 #define CSR_SPEED_MAP_END               0x3000
  53
  54 #define CSR_OFFSET              0x40
  55 #define CSR_LEAF                0x80
  56 #define CSR_DIRECTORY           0xc0
  57
  58 #define CSR_DESCRIPTOR          0x01
  59 #define CSR_VENDOR              0x03
  60 #define CSR_HARDWARE_VERSION    0x04
  61 #define CSR_UNIT                0x11
  62 #define CSR_SPECIFIER_ID        0x12
  63 #define CSR_VERSION             0x13
  64 #define CSR_DEPENDENT_INFO      0x14
  65 #define CSR_MODEL               0x17
  66 #define CSR_DIRECTORY_ID        0x20
  67
  68 struct fw_csr_iterator {
  69         const u32 *p;
  70         const u32 *end;
  71 };
  72
  73 void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p);
  74 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value);
  75 int fw_csr_string(const u32 *directory, int key, char *buf, size_t size);
  76
  77 extern struct bus_type fw_bus_type;
  78
  79 struct fw_card_driver;
  80 struct fw_node;
  81
  82 struct fw_card {
  83         const struct fw_card_driver *driver;
  84         struct device *device;
  85         struct kref kref;
  86         struct completion done;
  87
  88         int node_id;
  89         int generation;
  90         int current_tlabel;
  91         u64 tlabel_mask;
  92         struct list_head transaction_list;
  93         u64 reset_jiffies;
  94
  95         u32 split_timeout_hi;
  96         u32 split_timeout_lo;
  97         unsigned int split_timeout_cycles;
  98         unsigned int split_timeout_jiffies;
  99
 100         unsigned long long guid;
 101         unsigned max_receive;
 102         int link_speed;
 103         int config_rom_generation;
 104
 105         spinlock_t lock; /* Take this lock when handling the lists in
 106                           * this struct. */
 107         struct fw_node *local_node;
 108         struct fw_node *root_node;
 109         struct fw_node *irm_node;
 110         u8 color; /* must be u8 to match the definition in struct fw_node */
 111         int gap_count;
 112         bool beta_repeaters_present;
 113
 114         int index;
 115         struct list_head link;
 116
 117         struct list_head phy_receiver_list;
 118
 119         struct delayed_work br_work; /* bus reset job */
 120         bool br_short;
 121
 122         struct delayed_work bm_work; /* bus manager job */
 123         int bm_retries;
 124         int bm_generation;
 125         int bm_node_id;
 126         bool bm_abdicate;
 127
 128         bool priority_budget_implemented;       /* controller feature */
 129         bool broadcast_channel_auto_allocated;  /* controller feature */
 130
 131         bool broadcast_channel_allocated;
 132         u32 broadcast_channel;
 133         __be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];
 134
 135         __be32 maint_utility_register;
 136 };
 137
 138 static inline struct fw_card *fw_card_get(struct fw_card *card)
 139 {
 140         kref_get(&card->kref);
 141
 142         return card;
 143 }
 144
 145 void fw_card_release(struct kref *kref);
 146
 147 static inline void fw_card_put(struct fw_card *card)
 148 {
 149         kref_put(&card->kref, fw_card_release);
 150 }
 151
 152 struct fw_attribute_group {
 153         struct attribute_group *groups[2];
 154         struct attribute_group group;
 155         struct attribute *attrs[13];
 156 };
 157
 158 enum fw_device_state {
 159         FW_DEVICE_INITIALIZING,
 160         FW_DEVICE_RUNNING,
 161         FW_DEVICE_GONE,
 162         FW_DEVICE_SHUTDOWN,
 163 };
 164
 165 /*
 166  * Note, fw_device.generation always has to be read before fw_device.node_id.
 167  * Use SMP memory barriers to ensure this.  Otherwise requests will be sent
 168  * to an outdated node_id if the generation was updated in the meantime due
 169  * to a bus reset.
 170  *
 171  * Likewise, fw-core will take care to update .node_id before .generation so
 172  * that whenever fw_device.generation is current WRT the actual bus generation,
 173  * fw_device.node_id is guaranteed to be current too.
 174  *
 175  * The same applies to fw_device.card->node_id vs. fw_device.generation.
 176  *
 177  * fw_device.config_rom and fw_device.config_rom_length may be accessed during
 178  * the lifetime of any fw_unit belonging to the fw_device, before device_del()
 179  * was called on the last fw_unit.  Alternatively, they may be accessed while
 180  * holding fw_device_rwsem.
 181  */
 182 struct fw_device {
 183         atomic_t state;
 184         struct fw_node *node;
 185         int node_id;
 186         int generation;
 187         unsigned max_speed;
 188         struct fw_card *card;
 189         struct device device;
 190
 191         struct mutex client_list_mutex;
 192         struct list_head client_list;
 193
 194         const u32 *config_rom;
 195         size_t config_rom_length;
 196         int config_rom_retries;
 197         unsigned is_local:1;
 198         unsigned max_rec:4;
 199         unsigned cmc:1;
 200         unsigned irmc:1;
 201         unsigned bc_implemented:2;
 202
 203         struct delayed_work work;
 204         struct fw_attribute_group attribute_group;
 205 };
 206
 207 static inline struct fw_device *fw_device(struct device *dev)
 208 {
 209         return container_of(dev, struct fw_device, device);
 210 }
 211
 212 static inline int fw_device_is_shutdown(struct fw_device *device)
 213 {
 214         return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
 215 }
 216
 217 int fw_device_enable_phys_dma(struct fw_device *device);
 218
 219 /*
 220  * fw_unit.directory must not be accessed after device_del(&fw_unit.device).
 221  */
 222 struct fw_unit {
 223         struct device device;
 224         const u32 *directory;
 225         struct fw_attribute_group attribute_group;
 226 };
 227
 228 static inline struct fw_unit *fw_unit(struct device *dev)
 229 {
 230         return container_of(dev, struct fw_unit, device);
 231 }
 232
 233 static inline struct fw_unit *fw_unit_get(struct fw_unit *unit)
 234 {
 235         get_device(&unit->device);
 236
 237         return unit;
 238 }
 239
 240 static inline void fw_unit_put(struct fw_unit *unit)
 241 {
 242         put_device(&unit->device);
 243 }
 244
 245 static inline struct fw_device *fw_parent_device(struct fw_unit *unit)
 246 {
 247         return fw_device(unit->device.parent);
 248 }
 249
 250 struct ieee1394_device_id;
 251
 252 struct fw_driver {
 253         struct device_driver driver;
 254         int (*probe)(struct fw_unit *unit, const struct ieee1394_device_id *id);
 255         /* Called when the parent device sits through a bus reset. */
 256         void (*update)(struct fw_unit *unit);
 257         void (*remove)(struct fw_unit *unit);
 258         const struct ieee1394_device_id *id_table;
 259 };
 260
 261 struct fw_packet;
 262 struct fw_request;
 263
 264 typedef void (*fw_packet_callback_t)(struct fw_packet *packet,
 265                                      struct fw_card *card, int status);
 266 typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
 267                                           void *data, size_t length,
 268                                           void *callback_data);
 269 /*
 270  * This callback handles an inbound request subaction.  It is called in
 271  * RCU read-side context, therefore must not sleep.
 272  *
 273  * The callback should not initiate outbound request subactions directly.
 274  * Otherwise there is a danger of recursion of inbound and outbound
 275  * transactions from and to the local node.
 276  *
 277  * The callback is responsible that either fw_send_response() or kfree()
 278  * is called on the @request, except for FCP registers for which the core
 279  * takes care of that.
 280  */
 281 typedef void (*fw_address_callback_t)(struct fw_card *card,
 282                                       struct fw_request *request,
 283                                       int tcode, int destination, int source,
 284                                       int generation,
 285                                       unsigned long long offset,
 286                                       void *data, size_t length,
 287                                       void *callback_data);
 288
 289 struct fw_packet {
 290         int speed;
 291         int generation;
 292         u32 header[4];
 293         size_t header_length;
 294         void *payload;
 295         size_t payload_length;
 296         dma_addr_t payload_bus;
 297         bool payload_mapped;
 298         u32 timestamp;
 299
 300         /*
 301          * This callback is called when the packet transmission has completed.
 302          * For successful transmission, the status code is the ack received
 303          * from the destination.  Otherwise it is one of the juju-specific
 304          * rcodes:  RCODE_SEND_ERROR, _CANCELLED, _BUSY, _GENERATION, _NO_ACK.
 305          * The callback can be called from tasklet context and thus
 306          * must never block.
 307          */
 308         fw_packet_callback_t callback;
 309         int ack;
 310         struct list_head link;
 311         void *driver_data;
 312 };
 313
 314 struct fw_transaction {
 315         int node_id; /* The generation is implied; it is always the current. */
 316         int tlabel;
 317         struct list_head link;
 318         struct fw_card *card;
 319         bool is_split_transaction;
 320         struct timer_list split_timeout_timer;
 321
 322         struct fw_packet packet;
 323
 324         /*
 325          * The data passed to the callback is valid only during the
 326          * callback.
 327          */
 328         fw_transaction_callback_t callback;
 329         void *callback_data;
 330 };
 331
 332 struct fw_address_handler {
 333         u64 offset;
 334         u64 length;
 335         fw_address_callback_t address_callback;
 336         void *callback_data;
 337         struct list_head link;
 338 };
 339
 340 struct fw_address_region {
 341         u64 start;
 342         u64 end;
 343 };
 344
 345 extern const struct fw_address_region fw_high_memory_region;
 346
 347 int fw_core_add_address_handler(struct fw_address_handler *handler,
 348                                 const struct fw_address_region *region);
 349 void fw_core_remove_address_handler(struct fw_address_handler *handler);
 350 void fw_send_response(struct fw_card *card,
 351                       struct fw_request *request, int rcode);
 352 int fw_get_request_speed(struct fw_request *request);
 353 void fw_send_request(struct fw_card *card, struct fw_transaction *t,
 354                      int tcode, int destination_id, int generation, int speed,
 355                      unsigned long long offset, void *payload, size_t length,
 356                      fw_transaction_callback_t callback, void *callback_data);
 357 int fw_cancel_transaction(struct fw_card *card,
 358                           struct fw_transaction *transaction);
 359 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
 360                        int generation, int speed, unsigned long long offset,
 361                        void *payload, size_t length);
 362 const char *fw_rcode_string(int rcode);
 363
 364 static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
 365 {
 366         return tag << 14 | channel << 8 | sy;
 367 }
 368
 369 struct fw_descriptor {
 370         struct list_head link;
 371         size_t length;
 372         u32 immediate;
 373         u32 key;
 374         const u32 *data;
 375 };
 376
 377 int fw_core_add_descriptor(struct fw_descriptor *desc);
 378 void fw_core_remove_descriptor(struct fw_descriptor *desc);
 379
 380 /*
 381  * The iso packet format allows for an immediate header/payload part
 382  * stored in 'header' immediately after the packet info plus an
 383  * indirect payload part that is pointer to by the 'payload' field.
 384  * Applications can use one or the other or both to implement simple
 385  * low-bandwidth streaming (e.g. audio) or more advanced
 386  * scatter-gather streaming (e.g. assembling video frame automatically).
 387  */
 388 struct fw_iso_packet {
 389         u16 payload_length;     /* Length of indirect payload           */
 390         u32 interrupt:1;        /* Generate interrupt on this packet    */
 391         u32 skip:1;             /* tx: Set to not send packet at all    */
 392                                 /* rx: Sync bit, wait for matching sy   */
 393         u32 tag:2;              /* tx: Tag in packet header             */
 394         u32 sy:4;               /* tx: Sy in packet header              */
 395         u32 header_length:8;    /* Length of immediate header           */
 396         u32 header[0];          /* tx: Top of 1394 isoch. data_block    */
 397 };
 398
 399 #define FW_ISO_CONTEXT_TRANSMIT                 0
 400 #define FW_ISO_CONTEXT_RECEIVE                  1
 401 #define FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL     2
 402
 403 #define FW_ISO_CONTEXT_MATCH_TAG0        1
 404 #define FW_ISO_CONTEXT_MATCH_TAG1        2
 405 #define FW_ISO_CONTEXT_MATCH_TAG2        4
 406 #define FW_ISO_CONTEXT_MATCH_TAG3        8
 407 #define FW_ISO_CONTEXT_MATCH_ALL_TAGS   15
 408
 409 /*
 410  * An iso buffer is just a set of pages mapped for DMA in the
 411  * specified direction.  Since the pages are to be used for DMA, they
 412  * are not mapped into the kernel virtual address space.  We store the
 413  * DMA address in the page private. The helper function
 414  * fw_iso_buffer_map() will map the pages into a given vma.
 415  */
 416 struct fw_iso_buffer {
 417         enum dma_data_direction direction;
 418         struct page **pages;
 419         int page_count;
 420         int page_count_mapped;
 421 };
 422
 423 int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
 424                        int page_count, enum dma_data_direction direction);
 425 void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
 426 size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed);
 427
 428 struct fw_iso_context;
 429 typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
 430                                   u32 cycle, size_t header_length,
 431                                   void *header, void *data);
 432 typedef void (*fw_iso_mc_callback_t)(struct fw_iso_context *context,
 433                                      dma_addr_t completed, void *data);
 434 struct fw_iso_context {
 435         struct fw_card *card;
 436         int type;
 437         int channel;
 438         int speed;
 439         bool drop_overflow_headers;
 440         size_t header_size;
 441         union {
 442                 fw_iso_callback_t sc;
 443                 fw_iso_mc_callback_t mc;
 444         } callback;
 445         void *callback_data;
 446 };
 447
 448 struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
 449                 int type, int channel, int speed, size_t header_size,
 450                 fw_iso_callback_t callback, void *callback_data);
 451 int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels);
 452 int fw_iso_context_queue(struct fw_iso_context *ctx,
 453                          struct fw_iso_packet *packet,
 454                          struct fw_iso_buffer *buffer,
 455                          unsigned long payload);
 456 void fw_iso_context_queue_flush(struct fw_iso_context *ctx);
 457 int fw_iso_context_flush_completions(struct fw_iso_context *ctx);
 458 int fw_iso_context_start(struct fw_iso_context *ctx,
 459                          int cycle, int sync, int tags);
 460 int fw_iso_context_stop(struct fw_iso_context *ctx);
 461 void fw_iso_context_destroy(struct fw_iso_context *ctx);
 462 void fw_iso_resource_manage(struct fw_card *card, int generation,
 463                             u64 channels_mask, int *channel, int *bandwidth,
 464                             bool allocate);
 465
 466 extern struct workqueue_struct *fw_workqueue;
 467
 468 #endif /* _LINUX_FIREWIRE_H */