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/*
* Copyright 2011 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <mmc.h>
#include <malloc.h>
/*
* The environment variables are written to just after the u-boot image
* on SDCard, so we must read the MBR to get the start address and code
* length of the u-boot image, then calculate the address of the env.
*/
#define ESDHC_BOOT_IMAGE_SIZE 0x48
#define ESDHC_BOOT_IMAGE_ADDR 0x50
#define ESDHC_DEFAULT_ENVADDR 0x400
int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
{
u8 *tmp_buf;
u32 blklen, code_offset, code_len, n;
blklen = mmc->read_bl_len;
tmp_buf = malloc(blklen);
if (!tmp_buf)
return 1;
/* read out the first block, get the config data information */
n = mmc->block_dev.block_read(&mmc->block_dev, 0, 1, tmp_buf);
if (!n) {
free(tmp_buf);
return 1;
}
/* Get the Source Address, from offset 0x50 */
code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR);
/* Get the code size from offset 0x48 */
code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE);
#ifdef CONFIG_ESDHC_HC_BLK_ADDR
/*
* On soc BSC9131, BSC9132:
* In High Capacity SD Cards (> 2 GBytes), the 32-bit source address and
* code length of these soc specify the memory address in block address
* format. Block length is fixed to 512 bytes as per the SD High
* Capacity specification.
*/
u64 tmp;
if (mmc->high_capacity) {
tmp = (u64)code_offset * blklen;
tmp += code_len * blklen;
} else
tmp = code_offset + code_len;
if ((tmp + CONFIG_ENV_SIZE > mmc->capacity) ||
(tmp > 0xFFFFFFFFU))
*env_addr = ESDHC_DEFAULT_ENVADDR;
else
*env_addr = tmp;
free(tmp_buf);
return 0;
#endif
*env_addr = code_offset + code_len;
free(tmp_buf);
return 0;
}
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