[U-Boot] [PATCH V4 8/9] SMDK5250: Enable EMMC booting

[Amar]

This patch adds support for EMMC booting on SMDK5250.

Changes from V1:
	1)Updated spl_boot.c file to maintain irom pointer table
	instead of using the #define values defined in header file.

Changes from V2:
	1)Updation of commit message and resubmition of proper patch set.

Changes from V3:
        No change.

Signed-off-by: Amar <amarendra.xt at samsung.com>
---
 board/samsung/smdk5250/clock_init.c | 15 +++++++++++
 board/samsung/smdk5250/clock_init.h |  5 ++++
 board/samsung/smdk5250/spl_boot.c   | 52 ++++++++++++++++++++++++++++++++-----
 3 files changed, 65 insertions(+), 7 deletions(-)

diff --git a/board/samsung/smdk5250/clock_init.c b/board/samsung/smdk5250/clock_init.c
index c009ae5..154993c 100644
--- a/board/samsung/smdk5250/clock_init.c
+++ b/board/samsung/smdk5250/clock_init.c
@@ -28,6 +28,7 @@
 #include <asm/arch/clk.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/spl.h>
+#include <asm/arch/dwmmc.h>
 
 #include "clock_init.h"
 #include "setup.h"
@@ -664,3 +665,17 @@ void clock_init_dp_clock(void)
 	/* We run DP at 267 Mhz */
 	setbits_le32(&clk->div_disp1_0, CLK_DIV_DISP1_0_FIMD1);
 }
+
+/*
+ * Set clock divisor value for booting from EMMC.
+ * Set DWMMC channel-0 clk div to operate mmc0 device at 50MHz.
+ */
+void emmc_boot_clk_div_set(void)
+{
+	struct exynos5_clock *clk = (struct exynos5_clock *)EXYNOS5_CLOCK_BASE;
+	unsigned int div_mmc;
+
+	div_mmc = readl((unsigned int) &clk->div_fsys1) & ~FSYS1_MMC0_DIV_MASK;
+	div_mmc |= FSYS1_MMC0_DIV_VAL;
+	writel(div_mmc, (unsigned int) &clk->div_fsys1);
+}
diff --git a/board/samsung/smdk5250/clock_init.h b/board/samsung/smdk5250/clock_init.h
index f751bcb..20a1d47 100644
--- a/board/samsung/smdk5250/clock_init.h
+++ b/board/samsung/smdk5250/clock_init.h
@@ -146,4 +146,9 @@ struct mem_timings *clock_get_mem_timings(void);
  * Initialize clock for the device
  */
 void system_clock_init(void);
+
+/*
+ * Set clock divisor value for booting from EMMC.
+ */
+void emmc_boot_clk_div_set(void);
 #endif
diff --git a/board/samsung/smdk5250/spl_boot.c b/board/samsung/smdk5250/spl_boot.c
index d8f3c1e..906e197 100644
--- a/board/samsung/smdk5250/spl_boot.c
+++ b/board/samsung/smdk5250/spl_boot.c
@@ -23,16 +23,38 @@
 #include<common.h>
 #include<config.h>
 
+#include <asm/arch-exynos/dmc.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/clk.h>
+
+#include "clock_init.h"
+
+/* Index into irom ptr table */
+enum index {
+	MMC_INDEX,
+	EMMC44_INDEX,
+	EMMC44_END_INDEX,
+	SPI_INDEX,
+};
+
+/* IROM Function Pointers Table */
+u32 irom_ptr_table[] = {
+	[MMC_INDEX] = 0x02020030,	/* iROM Function Pointer-SDMMC boot */
+	[EMMC44_INDEX] = 0x02020044,	/* iROM Function Pointer-EMMC4.4 boot*/
+	[EMMC44_END_INDEX] = 0x02020048,/* iROM Function Pointer
+						-EMMC4.4 end boot operation */
+	[SPI_INDEX] = 0x02020058,	/* iROM Function Pointer-SPI boot */
+	};
+
 enum boot_mode {
 	BOOT_MODE_MMC = 4,
 	BOOT_MODE_SERIAL = 20,
+	BOOT_MODE_EMMC = 8,	/* EMMC4.4 */
 	/* 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);
-
 /*
 * Copy U-boot from mmc to RAM:
 * COPY_BL2_FNPTR_ADDR: Address in iRAM, which Contains
@@ -40,23 +62,39 @@ enum boot_mode {
 */
 void copy_uboot_to_ram(void)
 {
-	spi_copy_func_t spi_copy;
 	enum boot_mode bootmode;
-	u32 (*copy_bl2)(u32, u32, u32);
-
+	u32 (*spi_copy)(u32 offset, u32 nblock, u32 dst);
+	u32 (*copy_bl2)(u32 offset, u32 nblock, u32 dst);
+	u32 (*copy_bl2_from_emmc)(u32 nblock, u32 dst);
+	void (*end_bootop_from_emmc)(void);
+	/* read Operation Mode ststus register to find the bootmode */
 	bootmode = readl(EXYNOS5_POWER_BASE) & OM_STAT;
 
 	switch (bootmode) {
 	case BOOT_MODE_SERIAL:
-		spi_copy = *(spi_copy_func_t *)EXYNOS_COPY_SPI_FNPTR_ADDR;
+		spi_copy = (void *) *(u32 *)irom_ptr_table[SPI_INDEX];
 		spi_copy(SPI_FLASH_UBOOT_POS, CONFIG_BL2_SIZE,
 						CONFIG_SYS_TEXT_BASE);
 		break;
 	case BOOT_MODE_MMC:
-		copy_bl2 = (void *) *(u32 *)COPY_BL2_FNPTR_ADDR;
+		copy_bl2 = (void *) *(u32 *)irom_ptr_table[MMC_INDEX];
 		copy_bl2(BL2_START_OFFSET, BL2_SIZE_BLOC_COUNT,
 						CONFIG_SYS_TEXT_BASE);
 		break;
+	case BOOT_MODE_EMMC:
+		/* Set the FSYS1 clock divisor value for EMMC boot */
+		emmc_boot_clk_div_set();
+
+		copy_bl2_from_emmc =
+			(void *) *(u32 *)irom_ptr_table[EMMC44_INDEX];
+		end_bootop_from_emmc =
+			(void *) *(u32 *)irom_ptr_table[EMMC44_END_INDEX];
+
+		copy_bl2_from_emmc(BL2_SIZE_BLOC_COUNT, CONFIG_SYS_TEXT_BASE);
+		end_bootop_from_emmc();
+
+		break;
+
 	default:
 		break;
 	}
-- 
1.8.0