[U-Boot] [PATCH v3 4/4] EXYNOS: SMDK5250: Add MMC SPL support

[Chander Kashyap]

This patch adds support for mmc spl booting.

Signed-off-by: Chander Kashyap <chander.kashyap at linaro.org>
---
Changes for v2:
	- None
Changes for v3:
	- None

 board/samsung/smdk5250/Makefile               |   16 ++++
 board/samsung/smdk5250/mmc_boot.c             |   58 ++++++++++++
 board/samsung/smdk5250/tools/mkexynos_image.c |  117 +++++++++++++++++++++++++
 include/configs/smdk5250.h                    |    3 +
 4 files changed, 194 insertions(+), 0 deletions(-)
 create mode 100644 board/samsung/smdk5250/mmc_boot.c
 create mode 100644 board/samsung/smdk5250/tools/mkexynos_image.c

diff --git a/board/samsung/smdk5250/Makefile b/board/samsung/smdk5250/Makefile
index a26f896..0e8c05a 100644
--- a/board/samsung/smdk5250/Makefile
+++ b/board/samsung/smdk5250/Makefile
@@ -26,18 +26,34 @@ LIB	= $(obj)lib$(BOARD).o
 
 SOBJS	:= lowlevel_init.o
 SOBJS	+= mem_setup.o
+
+ifndef CONFIG_SPL_BUILD
 COBJS	+= smdk5250.o
+endif
+
+ifdef CONFIG_SPL_BUILD
+COBJS	+= mmc_boot.o
+endif
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
 
 ALL	:=	 $(obj).depend $(LIB)
 
+ifdef CONFIG_SPL_BUILD
+ALL	+= $(OBJTREE)/tools/mk$(BOARD)spl
+endif
+
 all:	$(ALL)
 
 $(LIB):	$(OBJS)
 	$(call cmd_link_o_target, $(OBJS))
 
+ifdef CONFIG_SPL_BUILD
+$(OBJTREE)/tools/mk$(BOARD)spl:	tools/mkexynos_image.c
+	$(HOSTCC) tools/mkexynos_image.c -o $(OBJTREE)/tools/mk$(BOARD)spl
+endif
+
 #########################################################################
 
 # defines $(obj).depend target
diff --git a/board/samsung/smdk5250/mmc_boot.c b/board/samsung/smdk5250/mmc_boot.c
new file mode 100644
index 0000000..669c1a3
--- /dev/null
+++ b/board/samsung/smdk5250/mmc_boot.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include<common.h>
+#include<config.h>
+
+/*
+* Copy U-boot from mmc to RAM:
+* COPY_BL2_FNPTR_ADDR: Address in iRAM, which Contains
+* Pointer to API (Data transfer from mmc to ram)
+*/
+void copy_uboot_to_ram(void)
+{
+	u32 (*copy_bl2)(u32, u32, u32) = (void *) *(u32 *)COPY_BL2_FNPTR_ADDR;
+
+	copy_bl2(BL2_START_OFFSET, BL2_SIZE_BLOC_COUNT, CONFIG_SYS_TEXT_BASE);
+}
+
+void board_init_f(unsigned long bootflag)
+{
+	__attribute__((noreturn)) void (*uboot)(void);
+	copy_uboot_to_ram();
+
+	/* Jump to U-Boot image */
+	uboot = (void *)CONFIG_SYS_TEXT_BASE;
+	(*uboot)();
+	/* Never returns Here */
+}
+
+/* Place Holders */
+void board_init_r(gd_t *id, ulong dest_addr)
+{
+	/* Function attribute is no-return */
+	/* This Function never executes */
+	while (1)
+		;
+}
+
+void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3) {}
diff --git a/board/samsung/smdk5250/tools/mkexynos_image.c b/board/samsung/smdk5250/tools/mkexynos_image.c
new file mode 100644
index 0000000..e2b7805
--- /dev/null
+++ b/board/samsung/smdk5250/tools/mkexynos_image.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#define CHECKSUM_OFFSET		(14*1024-4)
+#define BUFSIZE			(16*1024)
+#define FILE_PERM		(S_IRUSR | S_IWUSR | S_IRGRP \
+				| S_IWGRP | S_IROTH | S_IWOTH)
+/*
+* Requirement:
+* IROM code reads first 14K bytes from boot device.
+* It then calculates the checksum of 14K-4 bytes and compare with data at
+* 14K-4 offset.
+*
+* This function takes two filenames:
+* IN  "u-boot-spl.bin" and
+* OUT "$(BOARD)-spl.bin as filenames.
+* It reads the "u-boot-spl.bin" in 16K buffer.
+* It calculates checksum of 14K-4 Bytes and stores at 14K-4 offset in buffer.
+* It writes the buffer to "$(BOARD)-spl.bin" file.
+*/
+
+int main(int argc, char **argv)
+{
+	int i, len;
+	unsigned char buffer[BUFSIZE] = {0};
+	int ifd, ofd;
+	unsigned long checksum = 0, count;
+
+	if (argc != 3) {
+		printf(" %d Wrong number of arguments\n", argc);
+		exit(EXIT_FAILURE);
+	}
+
+	ifd = open(argv[1], O_RDONLY);
+	if (ifd < 0) {
+		fprintf(stderr, "%s: Can't open %s: %s\n",
+			argv[0], argv[1], strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	ofd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, FILE_PERM);
+	if (ifd < 0) {
+		fprintf(stderr, "%s: Can't open %s: %s\n",
+			argv[0], argv[2], strerror(errno));
+		if (ifd)
+			close(ifd);
+		exit(EXIT_FAILURE);
+	}
+
+	len = lseek(ifd, 0, SEEK_END);
+	lseek(ifd, 0, SEEK_SET);
+
+	count = (len < CHECKSUM_OFFSET) ? len : CHECKSUM_OFFSET;
+
+	if (read(ifd, buffer, count) != count) {
+		fprintf(stderr, "%s: Can't read %s: %s\n",
+			argv[0], argv[1], strerror(errno));
+
+		if (ifd)
+			close(ifd);
+		if (ofd)
+			close(ofd);
+
+		exit(EXIT_FAILURE);
+	}
+
+	for (i = 0, checksum = 0; i < CHECKSUM_OFFSET; i++)
+		checksum += buffer[i];
+
+	memcpy(&buffer[CHECKSUM_OFFSET], &checksum, sizeof(checksum));
+
+	if (write(ofd, buffer, BUFSIZE) != BUFSIZE) {
+		fprintf(stderr, "%s: Can't write %s: %s\n",
+			argv[0], argv[2], strerror(errno));
+
+		if (ifd)
+			close(ifd);
+		if (ofd)
+			close(ofd);
+
+		exit(EXIT_FAILURE);
+	}
+
+	if (ifd)
+		close(ifd);
+	if (ofd)
+		close(ofd);
+
+	return EXIT_SUCCESS;
+}
diff --git a/include/configs/smdk5250.h b/include/configs/smdk5250.h
index 9962c14..31f56fd 100644
--- a/include/configs/smdk5250.h
+++ b/include/configs/smdk5250.h
@@ -95,6 +95,9 @@
 
 #define CONFIG_BOOTDELAY		3
 #define CONFIG_ZERO_BOOTDELAY_CHECK
+/* MMC SPL */
+#define CONFIG_SPL
+#define COPY_BL2_FNPTR_ADDR	0x02020030
 
 #define CONFIG_BOOTCOMMAND	"fatload mmc 0 40007000 uImage; bootm 40007000"
 
-- 
1.7.5.4