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