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 extern unsigned int mmc_align_data_size(struct mmc_card *, unsigned int); 139 140 extern int __mmc_claim_host(struct mmc_host *host, atomic_t *abort); 141 extern void mmc_release_host(struct mmc_host *host); 142 extern int mmc_try_claim_host(struct mmc_host *host); 143 144 /** 145 * mmc_claim_host - exclusively claim a host 146 * @host: mmc host to claim 147 * 148 * Claim a host for a set of operations. 149 */ 150 static inline void mmc_claim_host(struct mmc_host *host) 151 { 152 __mmc_claim_host(host, NULL); 153 } 154 155 extern u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max); 156 157 #endif 158