root/include/linux/mmc/core.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  linux/include/linux/mmc/core.h
   4  */
   5 #ifndef LINUX_MMC_CORE_H
   6 #define LINUX_MMC_CORE_H
   7 
   8 #include <linux/completion.h>
   9 #include <linux/types.h>
  10 
  11 struct mmc_data;
  12 struct mmc_request;
  13 
  14 enum mmc_blk_status {
  15         MMC_BLK_SUCCESS = 0,
  16         MMC_BLK_PARTIAL,
  17         MMC_BLK_CMD_ERR,
  18         MMC_BLK_RETRY,
  19         MMC_BLK_ABORT,
  20         MMC_BLK_DATA_ERR,
  21         MMC_BLK_ECC_ERR,
  22         MMC_BLK_NOMEDIUM,
  23         MMC_BLK_NEW_REQUEST,
  24 };
  25 
  26 struct mmc_command {
  27         u32                     opcode;
  28         u32                     arg;
  29 #define MMC_CMD23_ARG_REL_WR    (1 << 31)
  30 #define MMC_CMD23_ARG_PACKED    ((0 << 31) | (1 << 30))
  31 #define MMC_CMD23_ARG_TAG_REQ   (1 << 29)
  32         u32                     resp[4];
  33         unsigned int            flags;          /* expected response type */
  34 #define MMC_RSP_PRESENT (1 << 0)
  35 #define MMC_RSP_136     (1 << 1)                /* 136 bit response */
  36 #define MMC_RSP_CRC     (1 << 2)                /* expect valid crc */
  37 #define MMC_RSP_BUSY    (1 << 3)                /* card may send busy */
  38 #define MMC_RSP_OPCODE  (1 << 4)                /* response contains opcode */
  39 
  40 #define MMC_CMD_MASK    (3 << 5)                /* non-SPI command type */
  41 #define MMC_CMD_AC      (0 << 5)
  42 #define MMC_CMD_ADTC    (1 << 5)
  43 #define MMC_CMD_BC      (2 << 5)
  44 #define MMC_CMD_BCR     (3 << 5)
  45 
  46 #define MMC_RSP_SPI_S1  (1 << 7)                /* one status byte */
  47 #define MMC_RSP_SPI_S2  (1 << 8)                /* second byte */
  48 #define MMC_RSP_SPI_B4  (1 << 9)                /* four data bytes */
  49 #define MMC_RSP_SPI_BUSY (1 << 10)              /* card may send busy */
  50 
  51 /*
  52  * These are the native response types, and correspond to valid bit
  53  * patterns of the above flags.  One additional valid pattern
  54  * is all zeros, which means we don't expect a response.
  55  */
  56 #define MMC_RSP_NONE    (0)
  57 #define MMC_RSP_R1      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  58 #define MMC_RSP_R1B     (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
  59 #define MMC_RSP_R2      (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
  60 #define MMC_RSP_R3      (MMC_RSP_PRESENT)
  61 #define MMC_RSP_R4      (MMC_RSP_PRESENT)
  62 #define MMC_RSP_R5      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  63 #define MMC_RSP_R6      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  64 #define MMC_RSP_R7      (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  65 
  66 /* Can be used by core to poll after switch to MMC HS mode */
  67 #define MMC_RSP_R1_NO_CRC       (MMC_RSP_PRESENT|MMC_RSP_OPCODE)
  68 
  69 #define mmc_resp_type(cmd)      ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
  70 
  71 /*
  72  * These are the SPI response types for MMC, SD, and SDIO cards.
  73  * Commands return R1, with maybe more info.  Zero is an error type;
  74  * callers must always provide the appropriate MMC_RSP_SPI_Rx flags.
  75  */
  76 #define MMC_RSP_SPI_R1  (MMC_RSP_SPI_S1)
  77 #define MMC_RSP_SPI_R1B (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY)
  78 #define MMC_RSP_SPI_R2  (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
  79 #define MMC_RSP_SPI_R3  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  80 #define MMC_RSP_SPI_R4  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  81 #define MMC_RSP_SPI_R5  (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
  82 #define MMC_RSP_SPI_R7  (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
  83 
  84 #define mmc_spi_resp_type(cmd)  ((cmd)->flags & \
  85                 (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY|MMC_RSP_SPI_S2|MMC_RSP_SPI_B4))
  86 
  87 /*
  88  * These are the command types.
  89  */
  90 #define mmc_cmd_type(cmd)       ((cmd)->flags & MMC_CMD_MASK)
  91 
  92         unsigned int            retries;        /* max number of retries */
  93         int                     error;          /* command error */
  94 
  95 /*
  96  * Standard errno values are used for errors, but some have specific
  97  * meaning in the MMC layer:
  98  *
  99  * ETIMEDOUT    Card took too long to respond
 100  * EILSEQ       Basic format problem with the received or sent data
 101  *              (e.g. CRC check failed, incorrect opcode in response
 102  *              or bad end bit)
 103  * EINVAL       Request cannot be performed because of restrictions
 104  *              in hardware and/or the driver
 105  * ENOMEDIUM    Host can determine that the slot is empty and is
 106  *              actively failing requests
 107  */
 108 
 109         unsigned int            busy_timeout;   /* busy detect timeout in ms */
 110         /* Set this flag only for blocking sanitize request */
 111         bool                    sanitize_busy;
 112 
 113         struct mmc_data         *data;          /* data segment associated with cmd */
 114         struct mmc_request      *mrq;           /* associated request */
 115 };
 116 
 117 struct mmc_data {
 118         unsigned int            timeout_ns;     /* data timeout (in ns, max 80ms) */
 119         unsigned int            timeout_clks;   /* data timeout (in clocks) */
 120         unsigned int            blksz;          /* data block size */
 121         unsigned int            blocks;         /* number of blocks */
 122         unsigned int            blk_addr;       /* block address */
 123         int                     error;          /* data error */
 124         unsigned int            flags;
 125 
 126 #define MMC_DATA_WRITE          BIT(8)
 127 #define MMC_DATA_READ           BIT(9)
 128 /* Extra flags used by CQE */
 129 #define MMC_DATA_QBR            BIT(10)         /* CQE queue barrier*/
 130 #define MMC_DATA_PRIO           BIT(11)         /* CQE high priority */
 131 #define MMC_DATA_REL_WR         BIT(12)         /* Reliable write */
 132 #define MMC_DATA_DAT_TAG        BIT(13)         /* Tag request */
 133 #define MMC_DATA_FORCED_PRG     BIT(14)         /* Forced programming */
 134 
 135         unsigned int            bytes_xfered;
 136 
 137         struct mmc_command      *stop;          /* stop command */
 138         struct mmc_request      *mrq;           /* associated request */
 139 
 140         unsigned int            sg_len;         /* size of scatter list */
 141         int                     sg_count;       /* mapped sg entries */
 142         struct scatterlist      *sg;            /* I/O scatter list */
 143         s32                     host_cookie;    /* host private data */
 144 };
 145 
 146 struct mmc_host;
 147 struct mmc_request {
 148         struct mmc_command      *sbc;           /* SET_BLOCK_COUNT for multiblock */
 149         struct mmc_command      *cmd;
 150         struct mmc_data         *data;
 151         struct mmc_command      *stop;
 152 
 153         struct completion       completion;
 154         struct completion       cmd_completion;
 155         void                    (*done)(struct mmc_request *);/* completion function */
 156         /*
 157          * Notify uppers layers (e.g. mmc block driver) that recovery is needed
 158          * due to an error associated with the mmc_request. Currently used only
 159          * by CQE.
 160          */
 161         void                    (*recovery_notifier)(struct mmc_request *);
 162         struct mmc_host         *host;
 163 
 164         /* Allow other commands during this ongoing data transfer or busy wait */
 165         bool                    cap_cmd_during_tfr;
 166 
 167         int                     tag;
 168 };
 169 
 170 struct mmc_card;
 171 
 172 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq);
 173 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd,
 174                 int retries);
 175 
 176 int mmc_hw_reset(struct mmc_host *host);
 177 int mmc_sw_reset(struct mmc_host *host);
 178 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card);
 179 
 180 #endif /* LINUX_MMC_CORE_H */