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 static inline void fw_memcpy_from_be32(void *_dst, void *_src, size_t size)
  24 {
  25         u32    *dst = _dst;
  26         __be32 *src = _src;
  27         int i;
  28
  29         for (i = 0; i < size / 4; i++)
  30                 dst[i] = be32_to_cpu(src[i]);
  31 }
  32
  33 static inline void fw_memcpy_to_be32(void *_dst, void *_src, size_t size)
  34 {
  35         fw_memcpy_from_be32(_dst, _src, size);
  36 }
  37 #define CSR_REGISTER_BASE               0xfffff0000000ULL
  38
  39 /* register offsets are relative to CSR_REGISTER_BASE */
  40 #define CSR_STATE_CLEAR                 0x0
  41 #define CSR_STATE_SET                   0x4
  42 #define CSR_NODE_IDS                    0x8
  43 #define CSR_RESET_START                 0xc
  44 #define CSR_SPLIT_TIMEOUT_HI            0x18
  45 #define CSR_SPLIT_TIMEOUT_LO            0x1c
  46 #define CSR_CYCLE_TIME                  0x200
  47 #define CSR_BUS_TIME                    0x204
  48 #define CSR_BUSY_TIMEOUT                0x210
  49 #define CSR_BUS_MANAGER_ID              0x21c
  50 #define CSR_BANDWIDTH_AVAILABLE         0x220
  51 #define CSR_CHANNELS_AVAILABLE          0x224
  52 #define CSR_CHANNELS_AVAILABLE_HI       0x224
  53 #define CSR_CHANNELS_AVAILABLE_LO       0x228
  54 #define CSR_BROADCAST_CHANNEL           0x234
  55 #define CSR_CONFIG_ROM                  0x400
  56 #define CSR_CONFIG_ROM_END              0x800
  57 #define CSR_FCP_COMMAND                 0xB00
  58 #define CSR_FCP_RESPONSE                0xD00
  59 #define CSR_FCP_END                     0xF00
  60 #define CSR_TOPOLOGY_MAP                0x1000
  61 #define CSR_TOPOLOGY_MAP_END            0x1400
  62 #define CSR_SPEED_MAP                   0x2000
  63 #define CSR_SPEED_MAP_END               0x3000
  64
  65 #define CSR_OFFSET              0x40
  66 #define CSR_LEAF                0x80
  67 #define CSR_DIRECTORY           0xc0
  68
  69 #define CSR_DESCRIPTOR          0x01
  70 #define CSR_VENDOR              0x03
  71 #define CSR_HARDWARE_VERSION    0x04
  72 #define CSR_NODE_CAPABILITIES   0x0c
  73 #define CSR_UNIT                0x11
  74 #define CSR_SPECIFIER_ID        0x12
  75 #define CSR_VERSION             0x13
  76 #define CSR_DEPENDENT_INFO      0x14
  77 #define CSR_MODEL               0x17
  78 #define CSR_INSTANCE            0x18
  79 #define CSR_DIRECTORY_ID        0x20
  80
  81 struct fw_csr_iterator {
  82         u32 *p;
  83         u32 *end;
  84 };
  85
  86 void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 *p);
  87 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value);
  88
  89 extern struct bus_type fw_bus_type;
  90
  91 struct fw_card_driver;
  92 struct fw_node;
  93
  94 struct fw_card {
  95         const struct fw_card_driver *driver;
  96         struct device *device;
  97         struct kref kref;
  98         struct completion done;
  99
 100         int node_id;
 101         int generation;
 102         int current_tlabel;
 103         u64 tlabel_mask;
 104         struct list_head transaction_list;
 105         struct timer_list flush_timer;
 106         unsigned long reset_jiffies;
 107
 108         unsigned long long guid;
 109         unsigned max_receive;
 110         int link_speed;
 111         int config_rom_generation;
 112
 113         spinlock_t lock; /* Take this lock when handling the lists in
 114                           * this struct. */
 115         struct fw_node *local_node;
 116         struct fw_node *root_node;
 117         struct fw_node *irm_node;
 118         u8 color; /* must be u8 to match the definition in struct fw_node */
 119         int gap_count;
 120         bool beta_repeaters_present;
 121
 122         int index;
 123
 124         struct list_head link;
 125
 126         /* Work struct for BM duties. */
 127         struct delayed_work work;
 128         int bm_retries;
 129         int bm_generation;
 130
 131         bool broadcast_channel_allocated;
 132         u32 broadcast_channel;
 133         u32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];
 134 };
 135
 136 static inline struct fw_card *fw_card_get(struct fw_card *card)
 137 {
 138         kref_get(&card->kref);
 139
 140         return card;
 141 }
 142
 143 void fw_card_release(struct kref *kref);
 144
 145 static inline void fw_card_put(struct fw_card *card)
 146 {
 147         kref_put(&card->kref, fw_card_release);
 148 }
 149
 150 struct fw_attribute_group {
 151         struct attribute_group *groups[2];
 152         struct attribute_group group;
 153         struct attribute *attrs[12];
 154 };
 155
 156 enum fw_device_state {
 157         FW_DEVICE_INITIALIZING,
 158         FW_DEVICE_RUNNING,
 159         FW_DEVICE_GONE,
 160         FW_DEVICE_SHUTDOWN,
 161 };
 162
 163 /*
 164  * Note, fw_device.generation always has to be read before fw_device.node_id.
 165  * Use SMP memory barriers to ensure this.  Otherwise requests will be sent
 166  * to an outdated node_id if the generation was updated in the meantime due
 167  * to a bus reset.
 168  *
 169  * Likewise, fw-core will take care to update .node_id before .generation so
 170  * that whenever fw_device.generation is current WRT the actual bus generation,
 171  * fw_device.node_id is guaranteed to be current too.
 172  *
 173  * The same applies to fw_device.card->node_id vs. fw_device.generation.
 174  *
 175  * fw_device.config_rom and fw_device.config_rom_length may be accessed during
 176  * the lifetime of any fw_unit belonging to the fw_device, before device_del()
 177  * was called on the last fw_unit.  Alternatively, they may be accessed while
 178  * holding fw_device_rwsem.
 179  */
 180 struct fw_device {
 181         atomic_t state;
 182         struct fw_node *node;
 183         int node_id;
 184         int generation;
 185         unsigned max_speed;
 186         struct fw_card *card;
 187         struct device device;
 188
 189         struct mutex client_list_mutex;
 190         struct list_head client_list;
 191
 192         u32 *config_rom;
 193         size_t config_rom_length;
 194         int config_rom_retries;
 195         unsigned is_local:1;
 196         unsigned max_rec:4;
 197         unsigned cmc:1;
 198         unsigned irmc:1;
 199         unsigned bc_implemented:2;
 200
 201         struct delayed_work work;
 202         struct fw_attribute_group attribute_group;
 203 };
 204
 205 static inline struct fw_device *fw_device(struct device *dev)
 206 {
 207         return container_of(dev, struct fw_device, device);
 208 }
 209
 210 static inline int fw_device_is_shutdown(struct fw_device *device)
 211 {
 212         return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
 213 }
 214
 215 static inline struct fw_device *fw_device_get(struct fw_device *device)
 216 {
 217         get_device(&device->device);
 218
 219         return device;
 220 }
 221
 222 static inline void fw_device_put(struct fw_device *device)
 223 {
 224         put_device(&device->device);
 225 }
 226
 227 int fw_device_enable_phys_dma(struct fw_device *device);
 228
 229 /*
 230  * fw_unit.directory must not be accessed after device_del(&fw_unit.device).
 231  */
 232 struct fw_unit {
 233         struct device device;
 234         u32 *directory;
 235         struct fw_attribute_group attribute_group;
 236 };
 237
 238 static inline struct fw_unit *fw_unit(struct device *dev)
 239 {
 240         return container_of(dev, struct fw_unit, device);
 241 }
 242
 243 static inline struct fw_unit *fw_unit_get(struct fw_unit *unit)
 244 {
 245         get_device(&unit->device);
 246
 247         return unit;
 248 }
 249
 250 static inline void fw_unit_put(struct fw_unit *unit)
 251 {
 252         put_device(&unit->device);
 253 }
 254
 255 static inline struct fw_device *fw_parent_device(struct fw_unit *unit)
 256 {
 257         return fw_device(unit->device.parent);
 258 }
 259
 260 struct ieee1394_device_id;
 261
 262 struct fw_driver {
 263         struct device_driver driver;
 264         /* Called when the parent device sits through a bus reset. */
 265         void (*update)(struct fw_unit *unit);
 266         const struct ieee1394_device_id *id_table;
 267 };
 268
 269 struct fw_packet;
 270 struct fw_request;
 271
 272 typedef void (*fw_packet_callback_t)(struct fw_packet *packet,
 273                                      struct fw_card *card, int status);
 274 typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
 275                                           void *data, size_t length,
 276                                           void *callback_data);
 277 /*
 278  * Important note:  The callback must guarantee that either fw_send_response()
 279  * or kfree() is called on the @request.
 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, int speed,
 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         u32 timestamp;
 298
 299         /*
 300          * This callback is called when the packet transmission has
 301          * completed; for successful transmission, the status code is
 302          * the ack received from the destination, otherwise it's a
 303          * negative errno: ENOMEM, ESTALE, ETIMEDOUT, ENODEV, EIO.
 304          * The callback can be called from tasklet context and thus
 305          * must never block.
 306          */
 307         fw_packet_callback_t callback;
 308         int ack;
 309         struct list_head link;
 310         void *driver_data;
 311 };
 312
 313 struct fw_transaction {
 314         int node_id; /* The generation is implied; it is always the current. */
 315         int tlabel;
 316         int timestamp;
 317         struct list_head link;
 318
 319         struct fw_packet packet;
 320
 321         /*
 322          * The data passed to the callback is valid only during the
 323          * callback.
 324          */
 325         fw_transaction_callback_t callback;
 326         void *callback_data;
 327 };
 328
 329 struct fw_address_handler {
 330         u64 offset;
 331         size_t length;
 332         fw_address_callback_t address_callback;
 333         void *callback_data;
 334         struct list_head link;
 335 };
 336
 337 struct fw_address_region {
 338         u64 start;
 339         u64 end;
 340 };
 341
 342 extern const struct fw_address_region fw_high_memory_region;
 343
 344 int fw_core_add_address_handler(struct fw_address_handler *handler,
 345                                 const struct fw_address_region *region);
 346 void fw_core_remove_address_handler(struct fw_address_handler *handler);
 347 void fw_send_response(struct fw_card *card,
 348                       struct fw_request *request, int rcode);
 349 void fw_send_request(struct fw_card *card, struct fw_transaction *t,
 350                      int tcode, int destination_id, int generation, int speed,
 351                      unsigned long long offset, void *payload, size_t length,
 352                      fw_transaction_callback_t callback, void *callback_data);
 353 int fw_cancel_transaction(struct fw_card *card,
 354                           struct fw_transaction *transaction);
 355 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
 356                        int generation, int speed, unsigned long long offset,
 357                        void *payload, size_t length);
 358
 359 static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
 360 {
 361         return tag << 14 | channel << 8 | sy;
 362 }
 363
 364 struct fw_descriptor {
 365         struct list_head link;
 366         size_t length;
 367         u32 immediate;
 368         u32 key;
 369         const u32 *data;
 370 };
 371
 372 int fw_core_add_descriptor(struct fw_descriptor *desc);
 373 void fw_core_remove_descriptor(struct fw_descriptor *desc);
 374
 375 /*
 376  * The iso packet format allows for an immediate header/payload part
 377  * stored in 'header' immediately after the packet info plus an
 378  * indirect payload part that is pointer to by the 'payload' field.
 379  * Applications can use one or the other or both to implement simple
 380  * low-bandwidth streaming (e.g. audio) or more advanced
 381  * scatter-gather streaming (e.g. assembling video frame automatically).
 382  */
 383 struct fw_iso_packet {
 384         u16 payload_length;     /* Length of indirect payload. */
 385         u32 interrupt:1;        /* Generate interrupt on this packet */
 386         u32 skip:1;             /* Set to not send packet at all. */
 387         u32 tag:2;
 388         u32 sy:4;
 389         u32 header_length:8;    /* Length of immediate header. */
 390         u32 header[0];
 391 };
 392
 393 #define FW_ISO_CONTEXT_TRANSMIT 0
 394 #define FW_ISO_CONTEXT_RECEIVE  1
 395
 396 #define FW_ISO_CONTEXT_MATCH_TAG0        1
 397 #define FW_ISO_CONTEXT_MATCH_TAG1        2
 398 #define FW_ISO_CONTEXT_MATCH_TAG2        4
 399 #define FW_ISO_CONTEXT_MATCH_TAG3        8
 400 #define FW_ISO_CONTEXT_MATCH_ALL_TAGS   15
 401
 402 /*
 403  * An iso buffer is just a set of pages mapped for DMA in the
 404  * specified direction.  Since the pages are to be used for DMA, they
 405  * are not mapped into the kernel virtual address space.  We store the
 406  * DMA address in the page private. The helper function
 407  * fw_iso_buffer_map() will map the pages into a given vma.
 408  */
 409 struct fw_iso_buffer {
 410         enum dma_data_direction direction;
 411         struct page **pages;
 412         int page_count;
 413 };
 414
 415 int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
 416                        int page_count, enum dma_data_direction direction);
 417 void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
 418
 419 struct fw_iso_context;
 420 typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
 421                                   u32 cycle, size_t header_length,
 422                                   void *header, void *data);
 423 struct fw_iso_context {
 424         struct fw_card *card;
 425         int type;
 426         int channel;
 427         int speed;
 428         size_t header_size;
 429         fw_iso_callback_t callback;
 430         void *callback_data;
 431 };
 432
 433 struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
 434                 int type, int channel, int speed, size_t header_size,
 435                 fw_iso_callback_t callback, void *callback_data);
 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 */