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Diffstat (limited to 'include/linux/mmc/core.h')
| -rw-r--r-- | include/linux/mmc/core.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h new file mode 100644 index 0000000..7f0e786 --- /dev/null +++ b/include/linux/mmc/core.h @@ -0,0 +1,132 @@ +/* + * (C) Copyright 2008-2009 Freescale Semiconductor, Inc. + * + * linux/include/linux/mmc/core.h + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef MMC_CORE_H +#define MMC_CORE_H + +#include <asm/arch/sdhc.h> + +struct request; +struct mmc_data; +struct mmc_request; + +struct mmc_command { + esdhc_cmd_t cmd; + esdhc_resp_t resp; +#define MMC_RSP_PRESENT (1 << 0) +#define MMC_RSP_136 (1 << 1) /* 136 bit response */ +#define MMC_RSP_CRC (1 << 2) /* expect valid crc */ +#define MMC_RSP_BUSY (1 << 3) /* card may send busy */ +#define MMC_RSP_OPCODE (1 << 4) /* response contains opcode */ + +#define MMC_CMD_MASK (3 << 5) /* non-SPI command type */ +#define MMC_CMD_AC (0 << 5) +#define MMC_CMD_ADTC (1 << 5) +#define MMC_CMD_BC (2 << 5) +#define MMC_CMD_BCR (3 << 5) + +#define MMC_RSP_SPI_S1 (1 << 7) /* one status byte */ +#define MMC_RSP_SPI_S2 (1 << 8) /* second byte */ +#define MMC_RSP_SPI_B4 (1 << 9) /* four data bytes */ +#define MMC_RSP_SPI_BUSY (1 << 10) /* card may send busy */ + +/* + * These are the native response types, and correspond to valid bit + * patterns of the above flags. One additional valid pattern + * is all zeros, which means we don't expect a response. + */ +#define MMC_RSP_NONE (0) +#define MMC_RSP_R1 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE) +#define MMC_RSP_R1B (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY) +#define MMC_RSP_R2 (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC) +#define MMC_RSP_R3 (MMC_RSP_PRESENT) +#define MMC_RSP_R4 (MMC_RSP_PRESENT) +#define MMC_RSP_R5 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE) +#define MMC_RSP_R6 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE) +#define MMC_RSP_R7 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE) + +#define mmc_resp_type(cmd) ((cmd)->flags & \ + (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC| \ + MMC_RSP_BUSY|MMC_RSP_OPCODE)) + +#define MMC_KEEP_CLK_RUN (1 << 31) /* Keep card clock on after request */ + +/* + * These are the SPI response types for MMC, SD, and SDIO cards. + * Commands return R1, with maybe more info. Zero is an error type; + * callers must always provide the appropriate MMC_RSP_SPI_Rx flags. + */ +#define MMC_RSP_SPI_R1 (MMC_RSP_SPI_S1) +#define MMC_RSP_SPI_R1B (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY) +#define MMC_RSP_SPI_R2 (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2) +#define MMC_RSP_SPI_R3 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4) +#define MMC_RSP_SPI_R4 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4) +#define MMC_RSP_SPI_R5 (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2) +#define MMC_RSP_SPI_R7 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4) + +#define mmc_spi_resp_type(cmd) ((cmd)->flags & \ + (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY|MMC_RSP_SPI_S2|MMC_RSP_SPI_B4)) + +/* + * These are the command types. + */ +#define mmc_cmd_type(cmd) ((cmd)->flags & MMC_CMD_MASK) + + unsigned int retries; /* max number of retries */ + unsigned int error; /* command error */ + +/* + * Standard errno values are used for errors, but some have specific + * meaning in the MMC layer: + * + * ETIMEDOUT Card took too long to respond + * EILSEQ Basic format problem with the received or sent data + * (e.g. CRC check failed, incorrect opcode in response + * or bad end bit) + * EINVAL Request cannot be performed because of restrictions + * in hardware and/or the driver + * ENOMEDIUM Host can determine that the slot is empty and is + * actively failing requests + */ + + struct mmc_data *data; /* data segment associated with cmd */ + struct mmc_request *mrq; /* associated request */ +}; + +struct mmc_data { + unsigned int timeout_ns; /* data timeout (in ns, max 80ms) */ + unsigned int timeout_clks; /* data timeout (in clocks) */ + unsigned int blksz; /* data block size */ + unsigned int blocks; /* number of blocks */ + unsigned int error; /* data error */ + unsigned int flags; + +#define MMC_DATA_WRITE (1 << 8) +#define MMC_DATA_READ (1 << 9) +#define MMC_DATA_STREAM (1 << 10) + + unsigned int bytes_xfered; + + struct mmc_command *stop; /* stop command */ + struct mmc_request *mrq; /* associated request */ + + unsigned int sg_len; /* size of scatter list */ + struct scatterlist *sg; /* I/O scatter list */ +}; + +struct mmc_request { + struct mmc_command *cmd; + struct mmc_data *data; + struct mmc_command *stop; + + void *done_data; /* completion data */ + void (*done)(struct mmc_request *); /* completion function */ +}; + +#endif |