include/linux/mmc/mmc.h

   1 /*
   2  *  linux/include/linux/mmc/mmc.h
   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 version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef MMC_H
   9 #define MMC_H
  10
  11 #include <linux/list.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/device.h>
  14
  15 struct request;
  16 struct mmc_data;
  17 struct mmc_request;
  18
  19 struct mmc_command {
  20         u32                     opcode;
  21         u32                     arg;
  22         u32                     resp[4];
  23         unsigned int            flags;          /* expected response type */
  24 #define MMC_RSP_NONE    (0 << 0)
  25 #define MMC_RSP_SHORT   (1 << 0)
  26 #define MMC_RSP_LONG    (2 << 0)
  27 #define MMC_RSP_MASK    (3 << 0)
  28 #define MMC_RSP_CRC     (1 << 3)                /* expect valid crc */
  29 #define MMC_RSP_BUSY    (1 << 4)                /* card may send busy */
  30
  31 /*
  32  * These are the response types, and correspond to valid bit
  33  * patterns of the above flags.  One additional valid pattern
  34  * is all zeros, which means we don't expect a response.
  35  */
  36 #define MMC_RSP_R1      (MMC_RSP_SHORT|MMC_RSP_CRC)
  37 #define MMC_RSP_R1B     (MMC_RSP_SHORT|MMC_RSP_CRC|MMC_RSP_BUSY)
  38 #define MMC_RSP_R2      (MMC_RSP_LONG|MMC_RSP_CRC)
  39 #define MMC_RSP_R3      (MMC_RSP_SHORT)
  40 #define MMC_RSP_R6      (MMC_RSP_SHORT|MMC_RSP_CRC)
  41
  42         unsigned int            retries;        /* max number of retries */
  43         unsigned int            error;          /* command error */
  44
  45 #define MMC_ERR_NONE    0
  46 #define MMC_ERR_TIMEOUT 1
  47 #define MMC_ERR_BADCRC  2
  48 #define MMC_ERR_FIFO    3
  49 #define MMC_ERR_FAILED  4
  50 #define MMC_ERR_INVALID 5
  51
  52         struct mmc_data         *data;          /* data segment associated with cmd */
  53         struct mmc_request      *mrq;           /* assoicated request */
  54 };
  55
  56 struct mmc_data {
  57         unsigned int            timeout_ns;     /* data timeout (in ns, max 80ms) */
  58         unsigned int            timeout_clks;   /* data timeout (in clocks) */
  59         unsigned int            blksz_bits;     /* data block size */
  60         unsigned int            blocks;         /* number of blocks */
  61         unsigned int            error;          /* data error */
  62         unsigned int            flags;
  63
  64 #define MMC_DATA_WRITE  (1 << 8)
  65 #define MMC_DATA_READ   (1 << 9)
  66 #define MMC_DATA_STREAM (1 << 10)
  67
  68         unsigned int            bytes_xfered;
  69
  70         struct mmc_command      *stop;          /* stop command */
  71         struct mmc_request      *mrq;           /* assoicated request */
  72
  73         unsigned int            sg_len;         /* size of scatter list */
  74         struct scatterlist      *sg;            /* I/O scatter list */
  75 };
  76
  77 struct mmc_request {
  78         struct mmc_command      *cmd;
  79         struct mmc_data         *data;
  80         struct mmc_command      *stop;
  81
  82         void                    *done_data;     /* completion data */
  83         void                    (*done)(struct mmc_request *);/* completion function */
  84 };
  85
  86 struct mmc_host;
  87 struct mmc_card;
  88
  89 extern int mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
  90 extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
  91
  92 extern int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card);
  93
  94 static inline void mmc_claim_host(struct mmc_host *host)
  95 {
  96         __mmc_claim_host(host, (struct mmc_card *)-1);
  97 }
  98
  99 extern void mmc_release_host(struct mmc_host *host);
 100
 101 #endif