include/linux/mmc/core.h

   1 /*
   2  *  linux/include/linux/mmc/core.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 LINUX_MMC_CORE_H
   9 #define LINUX_MMC_CORE_H
  10
  11 #include <linux/completion.h>
  12 #include <linux/types.h>
  13
  14 struct mmc_data;
  15 struct mmc_request;
  16
  17 enum mmc_blk_status {
  18         MMC_BLK_SUCCESS = 0,
  19         MMC_BLK_PARTIAL,
  20         MMC_BLK_CMD_ERR,
  21         MMC_BLK_RETRY,
  22         MMC_BLK_ABORT,
  23         MMC_BLK_DATA_ERR,
  24         MMC_BLK_ECC_ERR,
  25         MMC_BLK_NOMEDIUM,
  26         MMC_BLK_NEW_REQUEST,
  27 };
  28
  29 struct mmc_command {
  30         u32                     opcode;
  31         u32                     arg;
  32 #define MMC_CMD23_ARG_REL_WR    (1 << 31)
  33 #define MMC_CMD23_ARG_PACKED    ((0 << 31) | (1 << 30))
  34 #define MMC_CMD23_ARG_TAG_REQ   (1 << 29)
  35         u32                     resp[4];
  36         unsigned int            flags;          /* expected response type */
  37 #define MMC_RSP_PRESENT (1 << 0)
  38 #define MMC_RSP_136     (1 << 1)                /* 136 bit response */
  39 #define MMC_RSP_CRC     (1 << 2)                /* expect valid crc */
  40 #define MMC_RSP_BUSY    (1 << 3)                /* card may send busy */
  41 #define MMC_RSP_OPCODE  (1 << 4)                /* response contains opcode */
  42
  43 #define MMC_CMD_MASK    (3 << 5)                /* non-SPI command type */
  44 #define MMC_CMD_AC      (0 << 5)
  45 #define MMC_CMD_ADTC    (1 << 5)
  46 #define MMC_CMD_BC      (2 << 5)
  47 #define MMC_CMD_BCR     (3 << 5)
  48
  49 #define MMC_RSP_SPI_S1  (1 << 7)                /* one status byte */
  50 #define MMC_RSP_SPI_S2  (1 << 8)                /* second byte */
  51 #define MMC_RSP_SPI_B4  (1 << 9)                /* four data bytes */
  52 #define MMC_RSP_SPI_BUSY (1 << 10)              /* card may send busy */
  53
  54 /*
  55  * These are the native response types, and correspond to valid bit
  56  * patterns of the above flags.  One additional valid pattern
  57  * is all zeros, which means we don't expect a response.
  58  */
  59 #define MMC_RSP_NONE    (0)
  60 #define MMC_RSP_R1      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  61 #define MMC_RSP_R1B     (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
  62 #define MMC_RSP_R2      (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
  63 #define MMC_RSP_R3      (MMC_RSP_PRESENT)
  64 #define MMC_RSP_R4      (MMC_RSP_PRESENT)
  65 #define MMC_RSP_R5      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  66 #define MMC_RSP_R6      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  67 #define MMC_RSP_R7      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  68
  69 /* Can be used by core to poll after switch to MMC HS mode */
  70 #define MMC_RSP_R1_NO_CRC       (MMC_RSP_PRESENT|MMC_RSP_OPCODE)
  71
  72 #define mmc_resp_type(cmd)      ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
  73
  74 /*
  75  * These are the SPI response types for MMC, SD, and SDIO cards.
  76  * Commands return R1, with maybe more info.  Zero is an error type;
  77  * callers must always provide the appropriate MMC_RSP_SPI_Rx flags.
  78  */
  79 #define MMC_RSP_SPI_R1  (MMC_RSP_SPI_S1)
  80 #define MMC_RSP_SPI_R1B (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY)
  81 #define MMC_RSP_SPI_R2  (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
  82 #define MMC_RSP_SPI_R3  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  83 #define MMC_RSP_SPI_R4  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  84 #define MMC_RSP_SPI_R5  (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
  85 #define MMC_RSP_SPI_R7  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  86
  87 #define mmc_spi_resp_type(cmd)  ((cmd)->flags & \
  88                 (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY|MMC_RSP_SPI_S2|MMC_RSP_SPI_B4))
  89
  90 /*
  91  * These are the command types.
  92  */
  93 #define mmc_cmd_type(cmd)       ((cmd)->flags & MMC_CMD_MASK)
  94
  95         unsigned int            retries;        /* max number of retries */
  96         int                     error;          /* command error */
  97
  98 /*
  99  * Standard errno values are used for errors, but some have specific
 100  * meaning in the MMC layer:
 101  *
 102  * ETIMEDOUT    Card took too long to respond
 103  * EILSEQ       Basic format problem with the received or sent data
 104  *              (e.g. CRC check failed, incorrect opcode in response
 105  *              or bad end bit)
 106  * EINVAL       Request cannot be performed because of restrictions
 107  *              in hardware and/or the driver
 108  * ENOMEDIUM    Host can determine that the slot is empty and is
 109  *              actively failing requests
 110  */
 111
 112         unsigned int            busy_timeout;   /* busy detect timeout in ms */
 113         /* Set this flag only for blocking sanitize request */
 114         bool                    sanitize_busy;
 115
 116         struct mmc_data         *data;          /* data segment associated with cmd */
 117         struct mmc_request      *mrq;           /* associated request */
 118 };
 119
 120 struct mmc_data {
 121         unsigned int            timeout_ns;     /* data timeout (in ns, max 80ms) */
 122         unsigned int            timeout_clks;   /* data timeout (in clocks) */
 123         unsigned int            blksz;          /* data block size */
 124         unsigned int            blocks;         /* number of blocks */
 125         int                     error;          /* data error */
 126         unsigned int            flags;
 127
 128 #define MMC_DATA_WRITE  (1 << 8)
 129 #define MMC_DATA_READ   (1 << 9)
 130
 131         unsigned int            bytes_xfered;
 132
 133         struct mmc_command      *stop;          /* stop command */
 134         struct mmc_request      *mrq;           /* associated request */
 135
 136         unsigned int            sg_len;         /* size of scatter list */
 137         int                     sg_count;       /* mapped sg entries */
 138         struct scatterlist      *sg;            /* I/O scatter list */
 139         s32                     host_cookie;    /* host private data */
 140 };
 141
 142 struct mmc_host;
 143 struct mmc_request {
 144         struct mmc_command      *sbc;           /* SET_BLOCK_COUNT for multiblock */
 145         struct mmc_command      *cmd;
 146         struct mmc_data         *data;
 147         struct mmc_command      *stop;
 148
 149         struct completion       completion;
 150         struct completion       cmd_completion;
 151         void                    (*done)(struct mmc_request *);/* completion function */
 152         struct mmc_host         *host;
 153
 154         /* Allow other commands during this ongoing data transfer or busy wait */
 155         bool                    cap_cmd_during_tfr;
 156 };
 157
 158 struct mmc_card;
 159 struct mmc_async_req;
 160
 161 struct mmc_async_req *mmc_start_areq(struct mmc_host *host,
 162                                 struct mmc_async_req *areq,
 163                                 enum mmc_blk_status *ret_stat);
 164 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq);
 165 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd,
 166                 int retries);
 167
 168 int mmc_hw_reset(struct mmc_host *host);
 169 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card);
 170
 171 #endif /* LINUX_MMC_CORE_H */