[U-Boot] [PATCH 8/9] SMDK5250: Enable eMMC booting

[Amar]

This patch adds support for eMMC booting on SMDK5250

Signed-off-by: Amar <amarendra...@samsung.com>
---
 board/samsung/smdk5250/spl_boot.c |   38 ++++++++++++++++++++++++++++++++++++-
 1 files changed, 37 insertions(+), 1 deletions(-)

diff --git a/board/samsung/smdk5250/spl_boot.c 
b/board/samsung/smdk5250/spl_boot.c
index d8f3c1e..2648b4e 100644
--- a/board/samsung/smdk5250/spl_boot.c
+++ b/board/samsung/smdk5250/spl_boot.c
@@ -23,15 +23,40 @@
 #include<common.h>
 #include<config.h>
 
+#include <asm/arch/clock.h>
+#include <asm/arch/clk.h>
+
+#define FSYS1_MMC0_DIV_VAL      0x0701
+
 enum boot_mode {
        BOOT_MODE_MMC = 4,
+       BOOT_MODE_eMMC = 8, /* eMMC44 */
        BOOT_MODE_SERIAL = 20,
        /* Boot based on Operating Mode pin settings */
        BOOT_MODE_OM = 32,
        BOOT_MODE_USB,  /* Boot using USB download */
 };
 
-       typedef u32 (*spi_copy_func_t)(u32 offset, u32 nblock, u32 dst);
+typedef u32 (*spi_copy_func_t)(u32 offset, u32 nblock, u32 dst);
+static void set_emmc_clk(void);
+
+/*
+* Set MMC0 clock divisor value.
+* So that the mmc0 device operating freq is 50MHz.
+*/
+static void set_emmc_clk(void)
+{
+       struct exynos5_clock *clk = (struct exynos5_clock *)EXYNOS5_CLOCK_BASE;
+       unsigned int addr;
+       unsigned int div_mmc;
+
+       addr = (unsigned int) &clk->div_fsys1;
+
+       div_mmc = readl(addr) & ~FSYS1_MMC0_DIV_MASK;
+       div_mmc |= FSYS1_MMC0_DIV_VAL;
+       writel(div_mmc, addr);
+}
+
 
 /*
 * Copy U-boot from mmc to RAM:
@@ -43,6 +68,8 @@ void copy_uboot_to_ram(void)
        spi_copy_func_t spi_copy;
        enum boot_mode bootmode;
        u32 (*copy_bl2)(u32, u32, u32);
+       u32 (*copy_bl2_emmc)(u32, u32);
+       void (*end_bootop_emmc)(void);
 
        bootmode = readl(EXYNOS5_POWER_BASE) & OM_STAT;
 
@@ -57,6 +84,15 @@ void copy_uboot_to_ram(void)
                copy_bl2(BL2_START_OFFSET, BL2_SIZE_BLOC_COUNT,
                                                CONFIG_SYS_TEXT_BASE);
                break;
+       case BOOT_MODE_eMMC:
+               set_emmc_clk();
+               end_bootop_emmc = (void *) *(u32 *)EMMC44_END_BOOTOP_FNPTR_ADDR;
+               copy_bl2_emmc = (void *) *(u32 *)EMMC44_COPY_BL2_FNPTR_ADDR;
+
+               copy_bl2_emmc(BL2_SIZE_BLOC_COUNT, CONFIG_SYS_TEXT_BASE);
+               end_bootop_emmc();
+               break;
+
        default:
                break;
        }
-- 
1.7.0.4

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