da850/omap-l138: Add support to read u-boot image from MMC/SD

DA850/OMAP-L138 does not support strict MMC/SD boot mode. SPL will
be in SPI flash and U-Boot image will be in MMC/SD card. SPL will
do the low level initialization and then loads the u-boot image
from MMC/SD card.

Define CONFIG_SPL_MMC_LOAD macro in the DA850/OMAP-L138
configuration file to enable this feature.

Tested-by: Christian Riesch <christian.riesch@omicron.at>
Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: Rajashekhara, Sudhakar <sudhakar.raj@ti.com>
Signed-off-by: Hadli, Manjunath <manjunath.hadli@ti.com>

arch/arm/cpu/arm926ejs/davinci/spl.c

@@ -28,6 +28,7 @@
 #include <ns16550.h>
 #include <malloc.h>
 #include <spi_flash.h>
+#include <mmc.h>
 
 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 
@@ -96,4 +97,8 @@ void board_init_r(gd_t *id, ulong dummy)
 	puts("SPI boot...\n");
 	spi_boot();
 #endif
+#ifdef CONFIG_SPL_MMC_LOAD
+	puts("MMC boot...\n");
+	spl_mmc_load();
+#endif
 }

drivers/mmc/Makefile

@@ -25,6 +25,10 @@ include $(TOPDIR)/config.mk
 
 LIB	:= $(obj)libmmc.o
 
+ifdef CONFIG_SPL_MMC_LOAD
+COBJS-$(CONFIG_SPL_MMC_LOAD)	+= spl_mmc_load.o
+endif
+
 COBJS-$(CONFIG_BFIN_SDH) += bfin_sdh.o
 COBJS-$(CONFIG_DAVINCI_MMC) += davinci_mmc.o
 COBJS-$(CONFIG_FSL_ESDHC) += fsl_esdhc.o

drivers/mmc/spl_mmc_load.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <common.h>
+#include <mmc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static void mmc_load_image(struct mmc *mmc)
+{
+	s32 err;
+	void (*uboot)(void) __noreturn;
+
+	err = mmc->block_dev.block_read(0, CONFIG_SYS_MMC_U_BOOT_OFFS,
+			CONFIG_SYS_MMC_U_BOOT_SIZE/512,
+			(u32 *)CONFIG_SYS_TEXT_BASE);
+
+	if (err <= 0) {
+		printf("spl: error reading image %s, err - %d\n",
+			"u-boot.img", err);
+		hang();
+	}
+	uboot = (void *) CONFIG_SYS_TEXT_BASE;
+	(*uboot)();
+}
+
+void spl_mmc_load(void)
+{
+	struct mmc *mmc;
+	int err;
+	void (mmc_load_image)(struct mmc *mmc) __noreturn;
+
+	mmc_initialize(gd->bd);
+	mmc = find_mmc_device(0);
+	if (!mmc) {
+		puts("spl: mmc device not found!!\n");
+		hang();
+	} else {
+		puts("spl: mmc device found\n");
+	}
+	err = mmc_init(mmc);
+	if (err) {
+		printf("spl: mmc init failed: err - %d\n", err);
+		hang();
+	}
+	mmc_load_image(mmc);
+}

include/configs/da850evm.h

@@ -350,6 +350,17 @@
 #define CONFIG_SPL_TEXT_BASE	0x80000000
 #define CONFIG_SPL_MAX_SIZE	32768
 
+
+/* Load U-Boot Image From MMC */
+#ifdef CONFIG_SPL_MMC_LOAD
+#define CONFIG_SPL_MMC_SUPPORT
+#define CONFIG_SPL_FAT_SUPPORT
+#define CONFIG_SPL_LIBDISK_SUPPORT
+#define CONFIG_SYS_MMC_U_BOOT_OFFS	0x75
+#define CONFIG_SYS_MMC_U_BOOT_SIZE	0x30000
+#undef CONFIG_SPL_SPI_LOAD
+#endif
+
 /* additions for new relocation code, must added to all boards */
 #define CONFIG_SYS_SDRAM_BASE		0xc0000000
 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_SDRAM_BASE + 0x1000 - /* Fix this */ \

include/mmc.h

@@ -27,6 +27,7 @@
 #define _MMC_H_
 
 #include <linux/list.h>
+#include <linux/compiler.h>
 
 #define SD_VERSION_SD	0x20000
 #define SD_VERSION_2	(SD_VERSION_SD | 0x20)
@@ -273,6 +274,7 @@ int get_mmc_num(void);
 int board_mmc_getcd(struct mmc *mmc);
 int mmc_switch_part(int dev_num, unsigned int part_num);
 int mmc_getcd(struct mmc *mmc);
+void spl_mmc_load(void) __noreturn;
 
 #ifdef CONFIG_GENERIC_MMC
 #define mmc_host_is_spi(mmc)	((mmc)->host_caps & MMC_MODE_SPI)