1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright 2011 Freescale Semiconductor, Inc. 4 */ 5 6#include <common.h> 7#include <mmc.h> 8#include <malloc.h> 9 10/* 11 * The environment variables are written to just after the u-boot image 12 * on SDCard, so we must read the MBR to get the start address and code 13 * length of the u-boot image, then calculate the address of the env. 14 */ 15#define ESDHC_BOOT_IMAGE_SIZE 0x48 16#define ESDHC_BOOT_IMAGE_ADDR 0x50 17 18#define ESDHC_DEFAULT_ENVADDR 0x400 19 20int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr) 21{ 22 u8 *tmp_buf; 23 u32 blklen, code_offset, code_len, n; 24 25 blklen = mmc->read_bl_len; 26 tmp_buf = malloc(blklen); 27 if (!tmp_buf) 28 return 1; 29 30 /* read out the first block, get the config data information */ 31#ifdef CONFIG_BLK 32 n = blk_dread(mmc_get_blk_desc(mmc), 0, 1, tmp_buf); 33#else 34 n = mmc->block_dev.block_read(&mmc->block_dev, 0, 1, tmp_buf); 35#endif 36 if (!n) { 37 free(tmp_buf); 38 return 1; 39 } 40 41 /* Get the Source Address, from offset 0x50 */ 42 code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR); 43 44 /* Get the code size from offset 0x48 */ 45 code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE); 46 47#ifdef CONFIG_ESDHC_HC_BLK_ADDR 48 /* 49 * On soc BSC9131, BSC9132: 50 * In High Capacity SD Cards (> 2 GBytes), the 32-bit source address and 51 * code length of these soc specify the memory address in block address 52 * format. Block length is fixed to 512 bytes as per the SD High 53 * Capacity specification. 54 */ 55 u64 tmp; 56 57 if (mmc->high_capacity) { 58 tmp = (u64)code_offset * blklen; 59 tmp += code_len * blklen; 60 } else 61 tmp = code_offset + code_len; 62 63 if ((tmp + CONFIG_ENV_SIZE > mmc->capacity) || 64 (tmp > 0xFFFFFFFFU)) 65 *env_addr = ESDHC_DEFAULT_ENVADDR; 66 else 67 *env_addr = tmp; 68 69 free(tmp_buf); 70 71 return 0; 72#endif 73 74 *env_addr = code_offset + code_len; 75 76 free(tmp_buf); 77 78 return 0; 79} 80