LXR uboot/drivers/mmc/fsl_esdhc

   1/*
   2 * Copyright 2013 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#define MBRDBR_BOOT_SIG_55      0x1fe
  19#define MBRDBR_BOOT_SIG_AA      0x1ff
  20#define CONFIG_CFG_DATA_SECTOR  0
  21
  22
  23void mmc_spl_load_image(uint32_t offs, unsigned int size, void *vdst)
  24{
  25        uint blk_start, blk_cnt, err;
  26
  27        struct mmc *mmc = find_mmc_device(0);
  28        if (!mmc) {
  29                puts("spl: mmc device not found!!\n");
  30                hang();
  31        }
  32
  33        if (mmc_init(mmc)) {
  34                puts("MMC init failed\n");
  35                return;
  36        }
  37
  38        blk_start = ALIGN(offs, mmc->read_bl_len) / mmc->read_bl_len;
  39        blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
  40
  41        err = mmc->block_dev.block_read(0, blk_start, blk_cnt, vdst);
  42        if (err != blk_cnt) {
  43                puts("spl: mmc read failed!!\n");
  44                hang();
  45        }
  46}
  47
  48/*
  49 * The main entry for mmc booting. It's necessary that SDRAM is already
  50 * configured and available since this code loads the main U-Boot image
  51 * from mmc into SDRAM and starts it from there.
  52 */
  53
  54void __noreturn mmc_boot(void)
  55{
  56        __attribute__((noreturn)) void (*uboot)(void);
  57        uint blk_start, blk_cnt, err;
  58#ifndef CONFIG_FSL_CORENET
  59        uchar *tmp_buf;
  60        u32 blklen;
  61        uchar val;
  62        uint i, byte_num;
  63#endif
  64        u32 offset, code_len;
  65        struct mmc *mmc;
  66
  67        mmc = find_mmc_device(0);
  68        if (!mmc) {
  69                puts("spl: mmc device not found!!\n");
  70                hang();
  71        }
  72
  73#ifdef CONFIG_FSL_CORENET
  74        offset = CONFIG_SYS_MMC_U_BOOT_OFFS;
  75        code_len = CONFIG_SYS_MMC_U_BOOT_SIZE;
  76#else
  77        blklen = mmc->read_bl_len;
  78        tmp_buf = malloc(blklen);
  79        if (!tmp_buf) {
  80                puts("spl: malloc memory failed!!\n");
  81                hang();
  82        }
  83        memset(tmp_buf, 0, blklen);
  84
  85        /*
  86        * Read source addr from sd card
  87        */
  88        err = mmc->block_dev.block_read(0, CONFIG_CFG_DATA_SECTOR, 1, tmp_buf);
  89        if (err != 1) {
  90                puts("spl: mmc read failed!!\n");
  91                free(tmp_buf);
  92                hang();
  93        }
  94
  95        val = *(tmp_buf + MBRDBR_BOOT_SIG_55);
  96        if (0x55 != val) {
  97                puts("spl: mmc signature is not valid!!\n");
  98                free(tmp_buf);
  99                hang();
 100        }
 101        val = *(tmp_buf + MBRDBR_BOOT_SIG_AA);
 102        if (0xAA != val) {
 103                puts("spl: mmc signature is not valid!!\n");
 104                free(tmp_buf);
 105                hang();
 106        }
 107
 108        byte_num = 4;
 109        offset = 0;
 110        for (i = 0; i < byte_num; i++) {
 111                val = *(tmp_buf + ESDHC_BOOT_IMAGE_ADDR + i);
 112                offset = (offset << 8) + val;
 113        }
 114        offset += CONFIG_SYS_MMC_U_BOOT_OFFS;
 115        /* Get the code size from offset 0x48 */
 116        byte_num = 4;
 117        code_len = 0;
 118        for (i = 0; i < byte_num; i++) {
 119                val = *(tmp_buf + ESDHC_BOOT_IMAGE_SIZE + i);
 120                code_len = (code_len << 8) + val;
 121        }
 122        code_len -= CONFIG_SYS_MMC_U_BOOT_OFFS;
 123        /*
 124        * Load U-Boot image from mmc into RAM
 125        */
 126#endif
 127        blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 128        blk_cnt = ALIGN(code_len, mmc->read_bl_len) / mmc->read_bl_len;
 129        err = mmc->block_dev.block_read(0, blk_start, blk_cnt,
 130                                        (uchar *)CONFIG_SYS_MMC_U_BOOT_DST);
 131        if (err != blk_cnt) {
 132                puts("spl: mmc read failed!!\n");
 133#ifndef CONFIG_FSL_CORENET
 134                free(tmp_buf);
 135#endif
 136                hang();
 137        }
 138
 139        /*
 140        * Clean d-cache and invalidate i-cache, to
 141        * make sure that no stale data is executed.
 142        */
 143        flush_cache(CONFIG_SYS_MMC_U_BOOT_DST, CONFIG_SYS_MMC_U_BOOT_SIZE);
 144
 145        /*
 146        * Jump to U-Boot image
 147        */
 148        uboot = (void *)CONFIG_SYS_MMC_U_BOOT_START;
 149        (*uboot)();
 150}
 151