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https://github.com/brain-hackers/u-boot-brain
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![Amar](/assets/img/avatar_default.png)
This patch adds support for EMMC booting on SMDK5250. Signed-off-by: Amar <amarendra.xt@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/*
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* Copyright (C) 2012 Samsung Electronics
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include<common.h>
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#include<config.h>
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#include <asm/arch-exynos/dmc.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/clk.h>
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#include "clock_init.h"
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/* Index into irom ptr table */
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enum index {
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MMC_INDEX,
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EMMC44_INDEX,
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EMMC44_END_INDEX,
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SPI_INDEX,
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USB_INDEX,
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};
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/* IROM Function Pointers Table */
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u32 irom_ptr_table[] = {
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[MMC_INDEX] = 0x02020030, /* iROM Function Pointer-SDMMC boot */
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[EMMC44_INDEX] = 0x02020044, /* iROM Function Pointer-EMMC4.4 boot*/
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[EMMC44_END_INDEX] = 0x02020048,/* iROM Function Pointer
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-EMMC4.4 end boot operation */
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[SPI_INDEX] = 0x02020058, /* iROM Function Pointer-SPI boot */
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[USB_INDEX] = 0x02020070, /* iROM Function Pointer-USB boot*/
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};
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enum boot_mode {
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BOOT_MODE_MMC = 4,
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BOOT_MODE_SERIAL = 20,
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BOOT_MODE_EMMC = 8, /* EMMC4.4 */
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/* Boot based on Operating Mode pin settings */
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BOOT_MODE_OM = 32,
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BOOT_MODE_USB, /* Boot using USB download */
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};
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void *get_irom_func(int index)
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{
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return (void *)*(u32 *)irom_ptr_table[index];
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}
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/*
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* Set/clear program flow prediction and return the previous state.
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*/
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static int config_branch_prediction(int set_cr_z)
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{
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unsigned int cr;
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/* System Control Register: 11th bit Z Branch prediction enable */
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cr = get_cr();
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set_cr(set_cr_z ? cr | CR_Z : cr & ~CR_Z);
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return cr & CR_Z;
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}
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/*
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* Copy U-boot from mmc to RAM:
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* COPY_BL2_FNPTR_ADDR: Address in iRAM, which Contains
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* Pointer to API (Data transfer from mmc to ram)
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*/
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void copy_uboot_to_ram(void)
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{
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int is_cr_z_set;
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unsigned int sec_boot_check;
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enum boot_mode bootmode = BOOT_MODE_OM;
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u32 (*spi_copy)(u32 offset, u32 nblock, u32 dst);
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u32 (*copy_bl2)(u32 offset, u32 nblock, u32 dst);
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u32 (*copy_bl2_from_emmc)(u32 nblock, u32 dst);
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void (*end_bootop_from_emmc)(void);
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u32 (*usb_copy)(void);
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/* Read iRAM location to check for secondary USB boot mode */
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sec_boot_check = readl(EXYNOS_IRAM_SECONDARY_BASE);
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if (sec_boot_check == EXYNOS_USB_SECONDARY_BOOT)
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bootmode = BOOT_MODE_USB;
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if (bootmode == BOOT_MODE_OM)
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bootmode = readl(EXYNOS5_POWER_BASE) & OM_STAT;
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switch (bootmode) {
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case BOOT_MODE_SERIAL:
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spi_copy = get_irom_func(SPI_INDEX);
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spi_copy(SPI_FLASH_UBOOT_POS, CONFIG_BL2_SIZE,
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CONFIG_SYS_TEXT_BASE);
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break;
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case BOOT_MODE_MMC:
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copy_bl2 = get_irom_func(MMC_INDEX);
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copy_bl2(BL2_START_OFFSET, BL2_SIZE_BLOC_COUNT,
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CONFIG_SYS_TEXT_BASE);
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break;
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case BOOT_MODE_EMMC:
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/* Set the FSYS1 clock divisor value for EMMC boot */
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emmc_boot_clk_div_set();
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copy_bl2_from_emmc = get_irom_func(EMMC44_INDEX);
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end_bootop_from_emmc = get_irom_func(EMMC44_END_INDEX);
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copy_bl2_from_emmc(BL2_SIZE_BLOC_COUNT, CONFIG_SYS_TEXT_BASE);
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end_bootop_from_emmc();
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break;
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case BOOT_MODE_USB:
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/*
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* iROM needs program flow prediction to be disabled
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* before copy from USB device to RAM
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*/
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is_cr_z_set = config_branch_prediction(0);
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usb_copy = get_irom_func(USB_INDEX);
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usb_copy();
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config_branch_prediction(is_cr_z_set);
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break;
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default:
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break;
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}
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}
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void board_init_f(unsigned long bootflag)
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{
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__attribute__((noreturn)) void (*uboot)(void);
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copy_uboot_to_ram();
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/* Jump to U-Boot image */
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uboot = (void *)CONFIG_SYS_TEXT_BASE;
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(*uboot)();
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/* Never returns Here */
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}
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/* Place Holders */
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void board_init_r(gd_t *id, ulong dest_addr)
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{
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/* Function attribute is no-return */
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/* This Function never executes */
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while (1)
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;
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}
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void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3) {}
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