[U-Boot] [PATCH V9 4/4] omap-common/spl: Add linux boot to SPL

[Simon Schwarz]

From: Simon Schwarz <simonschwarzcor at googlemail.com>

This adds Linux booting to the SPL

This depends on CONFIG_MACH_TYPE patch by Igor Grinberg
(http://article.gmane.org/gmane.comp.boot-loaders.u-boot/105809)

Related CONFIGs:
CONFIG_SPL_OS_BOOT
	Activates/Deactivates the OS booting feature
CONFIG_SPL_OS_BOOT_KEY
	defines the IO-pin number u-boot switch - if pressed u-boot is booted
CONFIG_SYS_NAND_SPL_KERNEL_OFFS
	Offset in NAND of direct boot kernel image to use in SPL
CONFIG_SYS_SPL_ARGS_ADDR
	Address where the kernel boot arguments are expected - this is normaly
	RAM-begin + 0x100

Signed-off-by: Simon Schwarz <simonschwarzcor at gmail.com>
---
V2 changes:
nothing

V3 changes:
nothing

V4 changes:
CHG Using CONFIG_MACH_TYPE now.
DEL CONFIG_SYS_SPL_MACHID
CHG Use CONFIG_MACH_TYPE for machine id config - This makes the patch
	depending on the patch linked above

V5 changes:
FIX compile errors for OMAP4
REBASE u-boot-ti adapted new general gpio interface

V6 changes:
nothing

V7 changes:
FIX multiline comment style
	(http://article.gmane.org/gmane.comp.boot-loaders.u-boot/113501)

V8 changes:
REBASE on u-boot
---
 arch/arm/cpu/armv7/omap-common/spl.c |   51 ++++++++++++++++++++++++++++++++-
 include/configs/devkit8000.h         |    6 +++-
 2 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/arch/arm/cpu/armv7/omap-common/spl.c b/arch/arm/cpu/armv7/omap-common/spl.c
index d6d7d65..a739ba7 100644
--- a/arch/arm/cpu/armv7/omap-common/spl.c
+++ b/arch/arm/cpu/armv7/omap-common/spl.c
@@ -35,6 +35,7 @@
 #include <i2c.h>
 #include <image.h>
 #include <malloc.h>
+#include <asm/gpio.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -64,6 +65,26 @@ void board_init_f(ulong dummy)
 	relocate_code(CONFIG_SPL_STACK, &gdata, CONFIG_SPL_TEXT_BASE);
 }
 
+/*
+ * Return the value of the U-boot key
+ *
+ * RETURN
+ * 0 if not pressed
+ * positiv if pressed
+ */
+#ifdef CONFIG_SPL_OS_BOOT
+int spl_uboot_key(void)
+{
+	int val = 0;
+	if (!gpio_request(CONFIG_SPL_OS_BOOT_KEY, "U-Boot key")) {
+		gpio_direction_input(CONFIG_SPL_OS_BOOT_KEY);
+		val = gpio_get_value(CONFIG_SPL_OS_BOOT_KEY);
+		gpio_free(CONFIG_SPL_OS_BOOT_KEY);
+	}
+	return !val;
+}
+#endif
+
 void spl_parse_image_header(const struct image_header *header)
 {
 	u32 header_size = sizeof(struct image_header);
@@ -91,7 +112,26 @@ void spl_parse_image_header(const struct image_header *header)
 	}
 }
 
-static void jump_to_image_no_args(void)
+/*
+ * This function jumps to an image with argument. Normally an FDT or ATAGS
+ * image.
+ * arg: Pointer to paramter image in RAM
+ */
+#ifdef CONFIG_SPL_OS_BOOT
+void jump_to_image_linux(void *arg)
+{
+	debug("Entering kernel arg pointer: 0x%X\n", arg);
+	typedef void (*image_entry_arg_t)(int, int, void *)
+		__attribute__ ((noreturn));
+	image_entry_arg_t image_entry =
+		(image_entry_arg_t) spl_image.entry_point;
+	/* cleanup_before_linux(); */ /*write SPL function for that*/
+	image_entry(0, CONFIG_MACH_TYPE, arg);
+}
+void jump_to_image_linux(void *) __attribute__ ((noreturn));
+#endif
+
+void jump_to_image_no_args(void)
 {
 	typedef void (*image_entry_noargs_t)(u32 *)__attribute__ ((noreturn));
 	image_entry_noargs_t image_entry =
@@ -104,8 +144,8 @@ static void jump_to_image_no_args(void)
 #endif
 	image_entry((u32 *)&boot_params_ptr);
 }
-
 void jump_to_image_no_args(void) __attribute__ ((noreturn));
+
 void board_init_r(gd_t *id, ulong dummy)
 {
 	u32 boot_device;
@@ -142,6 +182,13 @@ void board_init_r(gd_t *id, ulong dummy)
 		debug("Jumping to U-Boot\n");
 		jump_to_image_no_args();
 		break;
+#ifdef CONFIG_SPL_OS_BOOT
+	case IH_OS_LINUX:
+		debug("Jumping to Linux\n");
+		spl_board_prepare_for_linux();
+		jump_to_image_linux((void *)CONFIG_SYS_SPL_ARGS_ADDR);
+		break;
+#endif
 	default:
 		puts("Unsupported OS image.. Jumping nevertheless..\n");
 		jump_to_image_no_args();
diff --git a/include/configs/devkit8000.h b/include/configs/devkit8000.h
index bb7509b..668253f 100644
--- a/include/configs/devkit8000.h
+++ b/include/configs/devkit8000.h
@@ -36,6 +36,7 @@
 #define CONFIG_OMAP34XX		1	/* which is a 34XX */
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_DEVKIT8000	1	/* working with DevKit8000 */
+#define CONFIG_MACH_TYPE		MACH_TYPE_DEVKIT8000
 
 /*
  * 1MB into the SDRAM to allow for SPL's bss at the beginning of SDRAM
@@ -339,7 +340,7 @@
 #define CONFIG_SPL_MAX_SIZE		0xB400  /* 45 K */
 #define CONFIG_SPL_STACK		LOW_LEVEL_SRAM_STACK
 
-#define CONFIG_SPL_BSS_START_ADDR	0x80000000 /*CONFIG_SYS_SDRAM_BASE*/
+#define CONFIG_SPL_BSS_START_ADDR	0x80000500 /* leave space for bootargs*/
 #define CONFIG_SPL_BSS_MAX_SIZE		0x80000
 
 /* NAND boot config */
@@ -373,6 +374,9 @@
 #define CONFIG_CMD_SPL_WRITE_SIZE	0x400 /* 1024 byte */
 #define CONFIG_CMD_SPL_NAND_OFS	(CONFIG_SYS_NAND_SPL_KERNEL_OFFS+\
 						0x400000)
+#define CONFIG_SPL_OS_BOOT
+#define CONFIG_SPL_OS_BOOT_KEY	26
+
 #define CONFIG_SYS_NAND_SPL_KERNEL_OFFS	0x280000
 #define CONFIG_SYS_SPL_ARGS_ADDR	(PHYS_SDRAM_1 + 0x100)
 #endif /* __CONFIG_H */
-- 
1.7.4.1