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

[Amar]

This patch adds support for eMMC booting on SMDK5250

Signed-off-by: Amar <amarendra.xt at 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