sdio.h

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#pragma once
 
#include <stdint.h>
#include <stddef.h>
 
// Implementation based on https://wiibrew.org/wiki//dev/sdio.

typedef enum {
    SD_CMD0_GO_IDLE_STATE         = 0,
    SD_CMD2_ALL_SEND_CID          = 2,
    SD_CMD3_SEND_RELATIVE_ADDR    = 3,
    SD_CMD7_SELECT_CARD           = 7,
    SD_CMD8_SEND_IF_COND          = 8,
    SD_CMD9_SEND_CSD              = 9,
    SD_CMD12_STOP_TRANSMISSION    = 12,
    SD_CMD16_SET_BLOCKLEN         = 16,
    SD_CMD17_READ_SINGLE_BLOCK    = 17,
    SD_CMD18_READ_MULTIPLE_BLOCK  = 18,
    SD_CMD24_WRITE_BLOCK          = 24,
    SD_CMD25_WRITE_MULTIPLE_BLOCK = 25,
    SD_CMD55_APP_CMD              = 55,
    SD_CMD56_GEN_CMD              = 56,
 
    SDIO_CMD5_IO_SEND_OP_COND     = 5,
    SDIO_CMD52_IO_RW_DIRECT       = 52,
    SDIO_CMD53_IO_RW_EXTENDED     = 53,
 
    SDIO_ACMD6_SET_BUS_WIDTH      = 6
} sdio_cmd_t;

typedef enum {
    SD_CMDTYPE_BC   = 1,  // Broadcast
    SD_CMDTYPE_BCR  = 2,  // Broadcast with response
    SD_CMDTYPE_AC   = 3,  // Addressed, no data
    SD_CMDTYPE_ADTC = 4   // Addressed, data transfer
} sdio_cmdtype_t;

typedef enum {
    SD_RESP_NONE = 0,  // No response
    SD_RESP_R1,        // Normal command response
    SD_RESP_R1b,       // With busy signal
    SD_RESP_R2,        // CID/CSD response
    SD_RESP_R3,        // OCR response
    SD_RESP_R4,        // IO_SEND_OP_COND response
    SD_RESP_R5,        // IO_RW_DIRECT response
    SD_RESP_R6,        // Published RCA response
    SD_RESP_R7         // Interface condition
} sdio_resptype_t;
 
#define SDIO_DEVICE_STATUS_CARD_INSERTED        (1<<0)
#define SDIO_DEVICE_STATUS_NOT_INSERTED         (1<<1)
#define SDIO_DEVICE_STATUS_WRITE_PROTECT_SWITCH (1<<2)
#define SDIO_DEVICE_STATUS_SD_INITIALIZED       (1<<16)
#define SDIO_DEVICE_STATUS_IS_SDHC              (1<<20)

extern int sdio_initialize(const char* device);

extern void sdio_close();

extern int sdio_get_device_status(uint32_t *state);

extern int sdio_reset_device(uint32_t* response);

extern int sdio_set_clock(uint32_t divider);

extern int sdio_read_oc_register(uint32_t* oc);

extern int sdio_read_hc_register(uint32_t offset, uint32_t* value);
 

extern int sdio_set_hc_register(uint32_t offset, uint32_t value);

extern int sdio_send_cmd(sdio_cmd_t cmd, sdio_cmdtype_t type, sdio_resptype_t resptype, uint32_t arg, void* data, uint32_t block_count, uint32_t sector_size, void* response, size_t response_length);