drivers/mmc/card/queue.h

   1 #ifndef MMC_QUEUE_H
   2 #define MMC_QUEUE_H
   3
   4 #define MMC_REQ_SPECIAL_MASK    (REQ_DISCARD | REQ_FLUSH)
   5
   6 struct request;
   7 struct task_struct;
   8
   9 struct mmc_blk_request {
  10         struct mmc_request      mrq;
  11         struct mmc_command      sbc;
  12         struct mmc_command      cmd;
  13         struct mmc_command      stop;
  14         struct mmc_data         data;
  15 };
  16
  17 enum mmc_packed_type {
  18         MMC_PACKED_NONE = 0,
  19         MMC_PACKED_WRITE,
  20 };
  21
  22 #define mmc_packed_cmd(type)    ((type) != MMC_PACKED_NONE)
  23 #define mmc_packed_wr(type)     ((type) == MMC_PACKED_WRITE)
  24
  25 struct mmc_packed {
  26         struct list_head        list;
  27         u32                     cmd_hdr[1024];
  28         unsigned int            blocks;
  29         u8                      nr_entries;
  30         u8                      retries;
  31         s16                     idx_failure;
  32 };
  33
  34 struct mmc_queue_req {
  35         struct request          *req;
  36         struct mmc_blk_request  brq;
  37         struct scatterlist      *sg;
  38         char                    *bounce_buf;
  39         struct scatterlist      *bounce_sg;
  40         unsigned int            bounce_sg_len;
  41         struct mmc_async_req    mmc_active;
  42         enum mmc_packed_type    cmd_type;
  43         struct mmc_packed       *packed;
  44 };
  45
  46 struct mmc_queue {
  47         struct mmc_card         *card;
  48         struct task_struct      *thread;
  49         struct semaphore        thread_sem;
  50         unsigned int            flags;
  51 #define MMC_QUEUE_SUSPENDED     (1 << 0)
  52 #define MMC_QUEUE_NEW_REQUEST   (1 << 1)
  53
  54         int                     (*issue_fn)(struct mmc_queue *, struct request *);
  55         void                    *data;
  56         struct request_queue    *queue;
  57         struct mmc_queue_req    mqrq[2];
  58         struct mmc_queue_req    *mqrq_cur;
  59         struct mmc_queue_req    *mqrq_prev;
  60 };
  61
  62 extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *,
  63                           const char *);
  64 extern void mmc_cleanup_queue(struct mmc_queue *);
  65 extern void mmc_queue_suspend(struct mmc_queue *);
  66 extern void mmc_queue_resume(struct mmc_queue *);
  67
  68 extern unsigned int mmc_queue_map_sg(struct mmc_queue *,
  69                                      struct mmc_queue_req *);
  70 extern void mmc_queue_bounce_pre(struct mmc_queue_req *);
  71 extern void mmc_queue_bounce_post(struct mmc_queue_req *);
  72
  73 extern int mmc_packed_init(struct mmc_queue *, struct mmc_card *);
  74 extern void mmc_packed_clean(struct mmc_queue *);
  75
  76 #endif