drivers/firewire/fw-transaction.h

   1 /*
   2  * Copyright (C) 2003-2006 Kristian Hoegsberg <krh@bitplanet.net>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #ifndef __fw_transaction_h
  20 #define __fw_transaction_h
  21
  22 #include <linux/completion.h>
  23 #include <linux/device.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/firewire-constants.h>
  26 #include <linux/kref.h>
  27 #include <linux/list.h>
  28 #include <linux/spinlock_types.h>
  29 #include <linux/timer.h>
  30 #include <linux/workqueue.h>
  31
  32 #define TCODE_IS_READ_REQUEST(tcode)    (((tcode) & ~1) == 4)
  33 #define TCODE_IS_BLOCK_PACKET(tcode)    (((tcode) &  1) != 0)
  34 #define TCODE_IS_REQUEST(tcode)         (((tcode) &  2) == 0)
  35 #define TCODE_IS_RESPONSE(tcode)        (((tcode) &  2) != 0)
  36 #define TCODE_HAS_REQUEST_DATA(tcode)   (((tcode) & 12) != 4)
  37 #define TCODE_HAS_RESPONSE_DATA(tcode)  (((tcode) & 12) != 0)
  38
  39 #define LOCAL_BUS 0xffc0
  40
  41 #define SELFID_PORT_CHILD       0x3
  42 #define SELFID_PORT_PARENT      0x2
  43 #define SELFID_PORT_NCONN       0x1
  44 #define SELFID_PORT_NONE        0x0
  45
  46 #define PHY_PACKET_CONFIG       0x0
  47 #define PHY_PACKET_LINK_ON      0x1
  48 #define PHY_PACKET_SELF_ID      0x2
  49
  50 /* Bit fields _within_ the PHY registers. */
  51 #define PHY_LINK_ACTIVE         0x80
  52 #define PHY_CONTENDER           0x40
  53 #define PHY_BUS_RESET           0x40
  54 #define PHY_BUS_SHORT_RESET     0x40
  55
  56 #define CSR_REGISTER_BASE               0xfffff0000000ULL
  57
  58 /* register offsets relative to CSR_REGISTER_BASE */
  59 #define CSR_STATE_CLEAR                 0x0
  60 #define CSR_STATE_SET                   0x4
  61 #define CSR_NODE_IDS                    0x8
  62 #define CSR_RESET_START                 0xc
  63 #define CSR_SPLIT_TIMEOUT_HI            0x18
  64 #define CSR_SPLIT_TIMEOUT_LO            0x1c
  65 #define CSR_CYCLE_TIME                  0x200
  66 #define CSR_BUS_TIME                    0x204
  67 #define CSR_BUSY_TIMEOUT                0x210
  68 #define CSR_BUS_MANAGER_ID              0x21c
  69 #define CSR_BANDWIDTH_AVAILABLE         0x220
  70 #define CSR_CHANNELS_AVAILABLE          0x224
  71 #define CSR_CHANNELS_AVAILABLE_HI       0x224
  72 #define CSR_CHANNELS_AVAILABLE_LO       0x228
  73 #define CSR_BROADCAST_CHANNEL           0x234
  74 #define CSR_CONFIG_ROM                  0x400
  75 #define CSR_CONFIG_ROM_END              0x800
  76 #define CSR_FCP_COMMAND                 0xB00
  77 #define CSR_FCP_RESPONSE                0xD00
  78 #define CSR_FCP_END                     0xF00
  79 #define CSR_TOPOLOGY_MAP                0x1000
  80 #define CSR_TOPOLOGY_MAP_END            0x1400
  81 #define CSR_SPEED_MAP                   0x2000
  82 #define CSR_SPEED_MAP_END               0x3000
  83
  84 #define BROADCAST_CHANNEL_INITIAL       (1 << 31 | 31)
  85 #define BROADCAST_CHANNEL_VALID         (1 << 30)
  86
  87 #define fw_notify(s, args...) printk(KERN_NOTICE KBUILD_MODNAME ": " s, ## args)
  88 #define fw_error(s, args...) printk(KERN_ERR KBUILD_MODNAME ": " s, ## args)
  89
  90 static inline void
  91 fw_memcpy_from_be32(void *_dst, void *_src, size_t size)
  92 {
  93         u32    *dst = _dst;
  94         __be32 *src = _src;
  95         int i;
  96
  97         for (i = 0; i < size / 4; i++)
  98                 dst[i] = be32_to_cpu(src[i]);
  99 }
 100
 101 static inline void
 102 fw_memcpy_to_be32(void *_dst, void *_src, size_t size)
 103 {
 104         fw_memcpy_from_be32(_dst, _src, size);
 105 }
 106
 107 struct fw_card;
 108 struct fw_packet;
 109 struct fw_node;
 110 struct fw_request;
 111
 112 struct fw_descriptor {
 113         struct list_head link;
 114         size_t length;
 115         u32 immediate;
 116         u32 key;
 117         const u32 *data;
 118 };
 119
 120 int fw_core_add_descriptor(struct fw_descriptor *desc);
 121 void fw_core_remove_descriptor(struct fw_descriptor *desc);
 122
 123 typedef void (*fw_packet_callback_t)(struct fw_packet *packet,
 124                                      struct fw_card *card, int status);
 125
 126 typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
 127                                           void *data,
 128                                           size_t length,
 129                                           void *callback_data);
 130
 131 /*
 132  * Important note:  The callback must guarantee that either fw_send_response()
 133  * or kfree() is called on the @request.
 134  */
 135 typedef void (*fw_address_callback_t)(struct fw_card *card,
 136                                       struct fw_request *request,
 137                                       int tcode, int destination, int source,
 138                                       int generation, int speed,
 139                                       unsigned long long offset,
 140                                       void *data, size_t length,
 141                                       void *callback_data);
 142
 143 typedef void (*fw_bus_reset_callback_t)(struct fw_card *handle,
 144                                         int node_id, int generation,
 145                                         u32 *self_ids,
 146                                         int self_id_count,
 147                                         void *callback_data);
 148
 149 struct fw_packet {
 150         int speed;
 151         int generation;
 152         u32 header[4];
 153         size_t header_length;
 154         void *payload;
 155         size_t payload_length;
 156         u32 timestamp;
 157
 158         /*
 159          * This callback is called when the packet transmission has
 160          * completed; for successful transmission, the status code is
 161          * the ack received from the destination, otherwise it's a
 162          * negative errno: ENOMEM, ESTALE, ETIMEDOUT, ENODEV, EIO.
 163          * The callback can be called from tasklet context and thus
 164          * must never block.
 165          */
 166         fw_packet_callback_t callback;
 167         int ack;
 168         struct list_head link;
 169         void *driver_data;
 170 };
 171
 172 struct fw_transaction {
 173         int node_id; /* The generation is implied; it is always the current. */
 174         int tlabel;
 175         int timestamp;
 176         struct list_head link;
 177
 178         struct fw_packet packet;
 179
 180         /*
 181          * The data passed to the callback is valid only during the
 182          * callback.
 183          */
 184         fw_transaction_callback_t callback;
 185         void *callback_data;
 186 };
 187
 188 static inline struct fw_packet *
 189 fw_packet(struct list_head *l)
 190 {
 191         return list_entry(l, struct fw_packet, link);
 192 }
 193
 194 struct fw_address_handler {
 195         u64 offset;
 196         size_t length;
 197         fw_address_callback_t address_callback;
 198         void *callback_data;
 199         struct list_head link;
 200 };
 201
 202
 203 struct fw_address_region {
 204         u64 start;
 205         u64 end;
 206 };
 207
 208 extern const struct fw_address_region fw_high_memory_region;
 209
 210 int fw_core_add_address_handler(struct fw_address_handler *handler,
 211                                 const struct fw_address_region *region);
 212 void fw_core_remove_address_handler(struct fw_address_handler *handler);
 213 void fw_fill_response(struct fw_packet *response, u32 *request_header,
 214                       int rcode, void *payload, size_t length);
 215 void fw_send_response(struct fw_card *card,
 216                       struct fw_request *request, int rcode);
 217
 218 extern struct bus_type fw_bus_type;
 219
 220 struct fw_card {
 221         const struct fw_card_driver *driver;
 222         struct device *device;
 223         struct kref kref;
 224         struct completion done;
 225
 226         int node_id;
 227         int generation;
 228         int current_tlabel, tlabel_mask;
 229         struct list_head transaction_list;
 230         struct timer_list flush_timer;
 231         unsigned long reset_jiffies;
 232
 233         unsigned long long guid;
 234         unsigned max_receive;
 235         int link_speed;
 236         int config_rom_generation;
 237
 238         /*
 239          * We need to store up to 4 self ID for a maximum of 63
 240          * devices plus 3 words for the topology map header.
 241          */
 242         int self_id_count;
 243         u32 topology_map[252 + 3];
 244         u32 broadcast_channel;
 245
 246         spinlock_t lock; /* Take this lock when handling the lists in
 247                           * this struct. */
 248         struct fw_node *local_node;
 249         struct fw_node *root_node;
 250         struct fw_node *irm_node;
 251         int color;
 252         int gap_count;
 253         bool beta_repeaters_present;
 254
 255         int index;
 256
 257         struct list_head link;
 258
 259         /* Work struct for BM duties. */
 260         struct delayed_work work;
 261         int bm_retries;
 262         int bm_generation;
 263 };
 264
 265 static inline struct fw_card *fw_card_get(struct fw_card *card)
 266 {
 267         kref_get(&card->kref);
 268
 269         return card;
 270 }
 271
 272 void fw_card_release(struct kref *kref);
 273
 274 static inline void fw_card_put(struct fw_card *card)
 275 {
 276         kref_put(&card->kref, fw_card_release);
 277 }
 278
 279 /*
 280  * The iso packet format allows for an immediate header/payload part
 281  * stored in 'header' immediately after the packet info plus an
 282  * indirect payload part that is pointer to by the 'payload' field.
 283  * Applications can use one or the other or both to implement simple
 284  * low-bandwidth streaming (e.g. audio) or more advanced
 285  * scatter-gather streaming (e.g. assembling video frame automatically).
 286  */
 287
 288 struct fw_iso_packet {
 289         u16 payload_length;     /* Length of indirect payload. */
 290         u32 interrupt : 1;      /* Generate interrupt on this packet */
 291         u32 skip : 1;           /* Set to not send packet at all. */
 292         u32 tag : 2;
 293         u32 sy : 4;
 294         u32 header_length : 8;  /* Length of immediate header. */
 295         u32 header[0];
 296 };
 297
 298 #define FW_ISO_CONTEXT_TRANSMIT 0
 299 #define FW_ISO_CONTEXT_RECEIVE  1
 300
 301 #define FW_ISO_CONTEXT_MATCH_TAG0        1
 302 #define FW_ISO_CONTEXT_MATCH_TAG1        2
 303 #define FW_ISO_CONTEXT_MATCH_TAG2        4
 304 #define FW_ISO_CONTEXT_MATCH_TAG3        8
 305 #define FW_ISO_CONTEXT_MATCH_ALL_TAGS   15
 306
 307 struct fw_iso_context;
 308
 309 typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
 310                                   u32 cycle,
 311                                   size_t header_length,
 312                                   void *header,
 313                                   void *data);
 314
 315 /*
 316  * An iso buffer is just a set of pages mapped for DMA in the
 317  * specified direction.  Since the pages are to be used for DMA, they
 318  * are not mapped into the kernel virtual address space.  We store the
 319  * DMA address in the page private. The helper function
 320  * fw_iso_buffer_map() will map the pages into a given vma.
 321  */
 322
 323 struct fw_iso_buffer {
 324         enum dma_data_direction direction;
 325         struct page **pages;
 326         int page_count;
 327 };
 328
 329 struct fw_iso_context {
 330         struct fw_card *card;
 331         int type;
 332         int channel;
 333         int speed;
 334         size_t header_size;
 335         fw_iso_callback_t callback;
 336         void *callback_data;
 337 };
 338
 339 int
 340 fw_iso_buffer_init(struct fw_iso_buffer *buffer,
 341                    struct fw_card *card,
 342                    int page_count,
 343                    enum dma_data_direction direction);
 344 int
 345 fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
 346 void
 347 fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
 348
 349 struct fw_iso_context *
 350 fw_iso_context_create(struct fw_card *card, int type,
 351                       int channel, int speed, size_t header_size,
 352                       fw_iso_callback_t callback, void *callback_data);
 353
 354 void
 355 fw_iso_context_destroy(struct fw_iso_context *ctx);
 356
 357 int
 358 fw_iso_context_queue(struct fw_iso_context *ctx,
 359                      struct fw_iso_packet *packet,
 360                      struct fw_iso_buffer *buffer,
 361                      unsigned long payload);
 362
 363 int
 364 fw_iso_context_start(struct fw_iso_context *ctx,
 365                      int cycle, int sync, int tags);
 366
 367 int
 368 fw_iso_context_stop(struct fw_iso_context *ctx);
 369
 370 struct fw_card_driver {
 371         /*
 372          * Enable the given card with the given initial config rom.
 373          * This function is expected to activate the card, and either
 374          * enable the PHY or set the link_on bit and initiate a bus
 375          * reset.
 376          */
 377         int (*enable)(struct fw_card *card, u32 *config_rom, size_t length);
 378
 379         int (*update_phy_reg)(struct fw_card *card, int address,
 380                               int clear_bits, int set_bits);
 381
 382         /*
 383          * Update the config rom for an enabled card.  This function
 384          * should change the config rom that is presented on the bus
 385          * an initiate a bus reset.
 386          */
 387         int (*set_config_rom)(struct fw_card *card,
 388                               u32 *config_rom, size_t length);
 389
 390         void (*send_request)(struct fw_card *card, struct fw_packet *packet);
 391         void (*send_response)(struct fw_card *card, struct fw_packet *packet);
 392         /* Calling cancel is valid once a packet has been submitted. */
 393         int (*cancel_packet)(struct fw_card *card, struct fw_packet *packet);
 394
 395         /*
 396          * Allow the specified node ID to do direct DMA out and in of
 397          * host memory.  The card will disable this for all node when
 398          * a bus reset happens, so driver need to reenable this after
 399          * bus reset.  Returns 0 on success, -ENODEV if the card
 400          * doesn't support this, -ESTALE if the generation doesn't
 401          * match.
 402          */
 403         int (*enable_phys_dma)(struct fw_card *card,
 404                                int node_id, int generation);
 405
 406         u64 (*get_bus_time)(struct fw_card *card);
 407
 408         struct fw_iso_context *
 409         (*allocate_iso_context)(struct fw_card *card,
 410                                 int type, size_t header_size);
 411         void (*free_iso_context)(struct fw_iso_context *ctx);
 412
 413         int (*start_iso)(struct fw_iso_context *ctx,
 414                          s32 cycle, u32 sync, u32 tags);
 415
 416         int (*queue_iso)(struct fw_iso_context *ctx,
 417                          struct fw_iso_packet *packet,
 418                          struct fw_iso_buffer *buffer,
 419                          unsigned long payload);
 420
 421         int (*stop_iso)(struct fw_iso_context *ctx);
 422 };
 423
 424 int
 425 fw_core_initiate_bus_reset(struct fw_card *card, int short_reset);
 426
 427 void
 428 fw_send_request(struct fw_card *card, struct fw_transaction *t,
 429                 int tcode, int node_id, int generation, int speed,
 430                 unsigned long long offset,
 431                 void *data, size_t length,
 432                 fw_transaction_callback_t callback, void *callback_data);
 433
 434 int fw_cancel_transaction(struct fw_card *card,
 435                           struct fw_transaction *transaction);
 436
 437 void fw_flush_transactions(struct fw_card *card);
 438
 439 void fw_send_phy_config(struct fw_card *card,
 440                         int node_id, int generation, int gap_count);
 441
 442 /*
 443  * Called by the topology code to inform the device code of node
 444  * activity; found, lost, or updated nodes.
 445  */
 446 void
 447 fw_node_event(struct fw_card *card, struct fw_node *node, int event);
 448
 449 /* API used by card level drivers */
 450
 451 void
 452 fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver,
 453                    struct device *device);
 454 int
 455 fw_card_add(struct fw_card *card,
 456             u32 max_receive, u32 link_speed, u64 guid);
 457
 458 void
 459 fw_core_remove_card(struct fw_card *card);
 460
 461 void
 462 fw_core_handle_bus_reset(struct fw_card *card,
 463                          int node_id, int generation,
 464                          int self_id_count, u32 *self_ids);
 465 void
 466 fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
 467
 468 void
 469 fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);
 470
 471 #endif /* __fw_transaction_h */