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first bits of SD/MMC protocol definition;
still more work to do

/*
 * $Id: sdmmcvar.h,v 1.1 2007/12/18 14:01:21 nbrk Exp $
 */
#ifndef _DEV_SDMMC_SDMMCVAR_H
#define _DEV_SDMMC_SDMMCVAR_H

/*
 * SD/MMC simplified commands set.
 */
#define CMD0_GO_IDLE_STATE 			0
#define CMD1_SEND_OP_COND 			1
#define CMD8_SEND_IF_COND 			8
#define CMD9_SEND_CSD 				9
#define CMD10_SEND_CID 				10
#define CMD12_STOP_TRANSMISSION 	12
#define CMD16_SET_BLOCKLEN 			16
#define CMD17_READ_SINGLE_BLOCK 	17
#define CMD18_READ_MULTIPLE_BLOCK 	18
#define CMD23_SET_BLOCK_COUNT 		23
#define CMD24_WRITE_BLOCK 			24
#define CMD25_WRITE_MULTIPLE_BLOCK 	25
#define CMD41_APP_SEND_OP_COND 		41
#define CMD55_APP_CMD 				55
#define CMD58_READ_OCR 				58

/*
 * Command frame.
 */
struct sdmmc_cmdframe {
	uint8_t 	sc_cmd;
	uint32_t 	sc_arg;
	uint8_t 	sc_crc;

} __attribute__((packed));

/*
 * Macross to construct frame header and footer.
 */
#define CMDFRAME_CMD(c) ((c & 0x3f) | 0x40)
#define CMDFRAME_CRC(c) (c << 1 | 0x01)

/*
 * Responses bitfields.
 */
#define R1_IN_IDLE_STATE 		0x01
#define R1_ERASE_RESET 			0x02
#define R1_ILLEGAL_COMMAND 		0x04
#define R1_COMMAND_CRC_ERROR 	0x08
#define R1_ERASE_SEQUENSE_ERROR 0x10
#define R1_ADDRESS_ERROR 		0x20
#define R1_PARAMETER_ERROR 		0x40

/*
 * R1 response frame.
 */
struct sdmmc_r1resp {
	uint8_t 	sr_eflags;

};

/*
 * R3 response frame.
 */
struct sdmmc_r3resp {
	uint8_t 	sr_eflags;
	uint32_t 	sr_ocr;

} __attribute__((packed));


#endif /* !_DEV_SDMMC_SDMMCVAR_H */