sys-sdcard.c File Reference

#include <barrier.h>
#include <io.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <types.h>
#include <log.h>
#include <timer.h>
#include <sys-clk.h>
#include <sys-gpio.h>
#include <mmc/sys-sdcard.h>

Include dependency graph for sys-sdcard.c:

Functions
int	sdmmc_init (sdmmc_pdata_t *data, sunxi_sdhci_t *hci)
	Initialize the SD/MMC interface.
uint32_t	sdmmc_blk_read (sdmmc_pdata_t *data, uint8_t *buf, uint32_t blkno, uint32_t blkcnt)
	Read blocks from the SD/MMC device.
uint32_t	sdmmc_blk_write (sdmmc_pdata_t *data, uint8_t *buf, uint32_t blkno, uint32_t blkcnt)
	Writes blocks of data to the SD/MMC device using the specified SDHCI instance.

Variables
sdmmc_pdata_t	card0
	External declaration of the 'card0' SDMMC platform data structure.

Function Documentation

sdmmc_blk_read()

uint32_t sdmmc_blk_read	(	sdmmc_pdata_t *	data,
		uint8_t *	buf,
		uint32_t	blkno,
		uint32_t	blkcnt
	)

Read blocks from the SD/MMC device.

Reads a specified number of blocks from the SD/MMC device using the provided platform data structure, destination buffer, block number, and block count. It calls the underlying function for reading blocks from the Sunxi MMC block device and returns the result.

Parameters

data	Pointer to the SD/MMC platform data structure
buf	Pointer to the destination buffer where the read data will be stored
blkno	The starting block number to read from
blkcnt	The number of blocks to read

Returns

Returns 0 on success, or an error code if the operation fails

sdmmc_blk_write()

uint32_t sdmmc_blk_write	(	sdmmc_pdata_t *	data,
		uint8_t *	buf,
		uint32_t	blkno,
		uint32_t	blkcnt
	)

Writes blocks of data to the SD/MMC device using the specified SDHCI instance.

This function writes a specified number of blocks to the SD/MMC (Secure Digital/MultiMediaCard) device associated with the given SDHCI (SD Host Controller Interface) instance. It serves as a wrapper around the sunxi_mmc_blk_write function, providing a simplified interface for block data write operations.

Parameters

[in]	data	A pointer to the SD/MMC platform data structure.
[in]	buf	A pointer to the source buffer from which data will be written to the SD/MMC device.
[in]	blkno	The starting block number where the data writing begins.
[in]	blkcnt	The number of blocks to write.

Returns

The number of blocks successfully written, or 0 if writing failed.

sdmmc_init()

int sdmmc_init	(	sdmmc_pdata_t *	data,
		sunxi_sdhci_t *	hci
	)

Initialize the SD/MMC interface.

Initializes the SD/MMC interface using the provided data structure and SD Host Controller instance. It sets the SD Host Controller instance and the online status in the data structure, and then initializes the MMC device. If the initialization is successful, it prints a message indicating the type of card detected and returns 0; otherwise, it returns -1.

Parameters

data	Pointer to the SD/MMC platform data structure
hci	Pointer to the Sunxi SD Host Controller instance

Returns

Returns 0 on success, or -1 if the initialization fails

Variable Documentation

card0

sdmmc_pdata_t card0

External declaration of the 'card0' SDMMC platform data structure.