/*
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* Copyright 2013 Freescale Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <mmc.h>
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#include <malloc.h>
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/*
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* The environment variables are written to just after the u-boot image
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* on SDCard, so we must read the MBR to get the start address and code
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* length of the u-boot image, then calculate the address of the env.
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*/
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#define ESDHC_BOOT_IMAGE_SIZE 0x48
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#define ESDHC_BOOT_IMAGE_ADDR 0x50
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#define MBRDBR_BOOT_SIG_55 0x1fe
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#define MBRDBR_BOOT_SIG_AA 0x1ff
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#define CONFIG_CFG_DATA_SECTOR 0
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void mmc_spl_load_image(uint32_t offs, unsigned int size, void *vdst)
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{
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uint blk_start, blk_cnt, err;
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struct mmc *mmc = find_mmc_device(0);
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if (!mmc) {
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puts("spl: mmc device not found!!\n");
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hang();
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}
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if (mmc_init(mmc)) {
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puts("MMC init failed\n");
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return;
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}
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blk_start = ALIGN(offs, mmc->read_bl_len) / mmc->read_bl_len;
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blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
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err = mmc->block_dev.block_read(&mmc->block_dev, blk_start, blk_cnt,
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vdst);
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if (err != blk_cnt) {
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puts("spl: mmc read failed!!\n");
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hang();
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}
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}
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/*
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* The main entry for mmc booting. It's necessary that SDRAM is already
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* configured and available since this code loads the main U-Boot image
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* from mmc into SDRAM and starts it from there.
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*/
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void __noreturn mmc_boot(void)
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{
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__attribute__((noreturn)) void (*uboot)(void);
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uint blk_start, blk_cnt, err;
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#ifndef CONFIG_FSL_CORENET
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uchar *tmp_buf;
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u32 blklen;
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uchar val;
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uint i, byte_num;
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#endif
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u32 offset, code_len;
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struct mmc *mmc;
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mmc = find_mmc_device(0);
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if (!mmc) {
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puts("spl: mmc device not found!!\n");
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hang();
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}
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#ifdef CONFIG_FSL_CORENET
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offset = CONFIG_SYS_MMC_U_BOOT_OFFS;
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code_len = CONFIG_SYS_MMC_U_BOOT_SIZE;
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#else
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blklen = mmc->read_bl_len;
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tmp_buf = malloc(blklen);
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if (!tmp_buf) {
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puts("spl: malloc memory failed!!\n");
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hang();
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}
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memset(tmp_buf, 0, blklen);
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/*
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* Read source addr from sd card
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*/
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err = mmc->block_dev.block_read(&mmc->block_dev,
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CONFIG_CFG_DATA_SECTOR, 1, tmp_buf);
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if (err != 1) {
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puts("spl: mmc read failed!!\n");
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free(tmp_buf);
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hang();
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}
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val = *(tmp_buf + MBRDBR_BOOT_SIG_55);
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if (0x55 != val) {
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puts("spl: mmc signature is not valid!!\n");
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free(tmp_buf);
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hang();
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}
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val = *(tmp_buf + MBRDBR_BOOT_SIG_AA);
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if (0xAA != val) {
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puts("spl: mmc signature is not valid!!\n");
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free(tmp_buf);
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hang();
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}
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byte_num = 4;
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offset = 0;
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for (i = 0; i < byte_num; i++) {
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val = *(tmp_buf + ESDHC_BOOT_IMAGE_ADDR + i);
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offset = (offset << 8) + val;
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}
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offset += CONFIG_SYS_MMC_U_BOOT_OFFS;
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/* Get the code size from offset 0x48 */
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byte_num = 4;
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code_len = 0;
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for (i = 0; i < byte_num; i++) {
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val = *(tmp_buf + ESDHC_BOOT_IMAGE_SIZE + i);
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code_len = (code_len << 8) + val;
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}
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code_len -= CONFIG_SYS_MMC_U_BOOT_OFFS;
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/*
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* Load U-Boot image from mmc into RAM
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*/
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#endif
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blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
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blk_cnt = ALIGN(code_len, mmc->read_bl_len) / mmc->read_bl_len;
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err = mmc->block_dev.block_read(&mmc->block_dev, blk_start, blk_cnt,
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(uchar *)CONFIG_SYS_MMC_U_BOOT_DST);
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if (err != blk_cnt) {
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puts("spl: mmc read failed!!\n");
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#ifndef CONFIG_FSL_CORENET
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free(tmp_buf);
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#endif
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hang();
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}
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/*
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* Clean d-cache and invalidate i-cache, to
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* make sure that no stale data is executed.
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*/
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flush_cache(CONFIG_SYS_MMC_U_BOOT_DST, CONFIG_SYS_MMC_U_BOOT_SIZE);
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/*
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* Jump to U-Boot image
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*/
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uboot = (void *)CONFIG_SYS_MMC_U_BOOT_START;
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(*uboot)();
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}
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