LXR uboot/board/freescale/common/sdhc

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