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/interrupt.h>
  12 #include <linux/device.h>
  13
  14 struct request;
  15 struct mmc_data;
  16 struct mmc_request;
  17
  18 struct mmc_command {
  19         u32                     opcode;
  20         u32                     arg;
  21         u32                     resp[4];
  22         unsigned int            flags;          /* expected response type */
  23 #define MMC_RSP_PRESENT (1 << 0)
  24 #define MMC_RSP_136     (1 << 1)                /* 136 bit response */
  25 #define MMC_RSP_CRC     (1 << 2)                /* expect valid crc */
  26 #define MMC_RSP_BUSY    (1 << 3)                /* card may send busy */
  27 #define MMC_RSP_OPCODE  (1 << 4)                /* response contains opcode */
  28
  29 #define MMC_CMD_MASK    (3 << 5)                /* non-SPI command type */
  30 #define MMC_CMD_AC      (0 << 5)
  31 #define MMC_CMD_ADTC    (1 << 5)
  32 #define MMC_CMD_BC      (2 << 5)
  33 #define MMC_CMD_BCR     (3 << 5)
  34
  35 #define MMC_RSP_SPI_S1  (1 << 7)                /* one status byte */
  36 #define MMC_RSP_SPI_S2  (1 << 8)                /* second byte */
  37 #define MMC_RSP_SPI_B4  (1 << 9)                /* four data bytes */
  38 #define MMC_RSP_SPI_BUSY (1 << 10)              /* card may send busy */
  39
  40 /*
  41  * These are the native response types, and correspond to valid bit
  42  * patterns of the above flags.  One additional valid pattern
  43  * is all zeros, which means we don't expect a response.
  44  */
  45 #define MMC_RSP_NONE    (0)
  46 #define MMC_RSP_R1      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  47 #define MMC_RSP_R1B     (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
  48 #define MMC_RSP_R2      (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
  49 #define MMC_RSP_R3      (MMC_RSP_PRESENT)
  50 #define MMC_RSP_R4      (MMC_RSP_PRESENT)
  51 #define MMC_RSP_R5      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  52 #define MMC_RSP_R6      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  53 #define MMC_RSP_R7      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  54
  55 #define mmc_resp_type(cmd)      ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
  56
  57 /*
  58  * These are the SPI response types for MMC, SD, and SDIO cards.
  59  * Commands return R1, with maybe more info.  Zero is an error type;
  60  * callers must always provide the appropriate MMC_RSP_SPI_Rx flags.
  61  */
  62 #define MMC_RSP_SPI_R1  (MMC_RSP_SPI_S1)
  63 #define MMC_RSP_SPI_R1B (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY)
  64 #define MMC_RSP_SPI_R2  (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
  65 #define MMC_RSP_SPI_R3  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  66 #define MMC_RSP_SPI_R4  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  67 #define MMC_RSP_SPI_R5  (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
  68 #define MMC_RSP_SPI_R7  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  69
  70 #define mmc_spi_resp_type(cmd)  ((cmd)->flags & \
  71                 (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY|MMC_RSP_SPI_S2|MMC_RSP_SPI_B4))
  72
  73 /*
  74  * These are the command types.
  75  */
  76 #define mmc_cmd_type(cmd)       ((cmd)->flags & MMC_CMD_MASK)
  77
  78         unsigned int            retries;        /* max number of retries */
  79         unsigned int            error;          /* command error */
  80
  81 /*
  82  * Standard errno values are used for errors, but some have specific
  83  * meaning in the MMC layer:
  84  *
  85  * ETIMEDOUT    Card took too long to respond
  86  * EILSEQ       Basic format problem with the received or sent data
  87  *              (e.g. CRC check failed, incorrect opcode in response
  88  *              or bad end bit)
  89  * EINVAL       Request cannot be performed because of restrictions
  90  *              in hardware and/or the driver
  91  * ENOMEDIUM    Host can determine that the slot is empty and is
  92  *              actively failing requests
  93  */
  94
  95         struct mmc_data         *data;          /* data segment associated with cmd */
  96         struct mmc_request      *mrq;           /* associated request */
  97 };
  98
  99 struct mmc_data {
 100         unsigned int            timeout_ns;     /* data timeout (in ns, max 80ms) */
 101         unsigned int            timeout_clks;   /* data timeout (in clocks) */
 102         unsigned int            blksz;          /* data block size */
 103         unsigned int            blocks;         /* number of blocks */
 104         unsigned int            error;          /* data error */
 105         unsigned int            flags;
 106
 107 #define MMC_DATA_WRITE  (1 << 8)
 108 #define MMC_DATA_READ   (1 << 9)
 109 #define MMC_DATA_STREAM (1 << 10)
 110
 111         unsigned int            bytes_xfered;
 112
 113         struct mmc_command      *stop;          /* stop command */
 114         struct mmc_request      *mrq;           /* associated request */
 115
 116         unsigned int            sg_len;         /* size of scatter list */
 117         struct scatterlist      *sg;            /* I/O scatter list */
 118 };
 119
 120 struct mmc_request {
 121         struct mmc_command      *cmd;
 122         struct mmc_data         *data;
 123         struct mmc_command      *stop;
 124
 125         void                    *done_data;     /* completion data */
 126         void                    (*done)(struct mmc_request *);/* completion function */
 127 };
 128
 129 struct mmc_host;
 130 struct mmc_card;
 131
 132 extern void mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
 133 extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
 134 extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
 135         struct mmc_command *, int);
 136
 137 extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *);
 138
 139 extern int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
 140 extern void mmc_release_host(struct mmc_host *host);
 141
 142 /**
 143  *      mmc_claim_host - exclusively claim a host
 144  *      @host: mmc host to claim
 145  *
 146  *      Claim a host for a set of operations.
 147  */
 148 static inline void mmc_claim_host(struct mmc_host *host)
 149 {
 150         __mmc_claim_host(host, NULL);
 151 }
 152
 153 #endif