ARM: Add support for ATAG_BOARD

Adds support for board specific tag ATAG_BOARD.
Signed-off-by: Juha Yrjola <juha.yrjola@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/kernel/arch.c

@@ -6,6 +6,7 @@
 #include <linux/config.h>
 #include <linux/init.h>
 #include <linux/types.h>
+#include <linux/string.h>
 
 #include <asm/elf.h>
 #include <asm/page.h>
@@ -44,3 +45,26 @@ static int __init parse_tag_acorn(const struct tag *tag)
 __tagtable(ATAG_ACORN, parse_tag_acorn);
 
 #endif
+
+#ifdef CONFIG_OMAP_BOOT_TAG
+
+unsigned char omap_bootloader_tag[512];
+int omap_bootloader_tag_len = 0;
+
+static int __init parse_tag_omap(const struct tag *tag)
+{
+	u32 size = tag->hdr.size - (sizeof(tag->hdr) >> 2);
+
+        size <<= 2;
+	if (size > sizeof(omap_bootloader_tag))
+		return -1;
+
+	memcpy(omap_bootloader_tag, tag->u.omap.data, size);
+	omap_bootloader_tag_len = size;
+
+        return 0;
+}
+
+__tagtable(ATAG_BOARD, parse_tag_omap);
+
+#endif

arch/arm/mach-omap/Kconfig

@@ -34,6 +34,14 @@ config OMAP_RESET_CLOCKS
 	  probably do not want this option enabled until your
 	  device drivers work properly.
 
+config OMAP_BOOT_TAG
+	bool "OMAP bootloader information passing"
+        depends on ARCH_OMAP
+        default n
+        help
+          Say Y, if you have a bootloader which passes information
+          about your board and its peripheral configuration.
+
 config OMAP_MUX
 	bool "OMAP multiplexing support"
         depends on ARCH_OMAP

include/asm-arm/setup.h

@@ -134,6 +134,13 @@ struct tag_acorn {
 	u8 adfsdrives;
 };
 
+/* TI OMAP specific information */
+#define ATAG_BOARD       0x414f4d50
+
+struct tag_omap {
+	u8 data[0];
+};
+
 /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
 #define ATAG_MEMCLK	0x41000402
 
@@ -159,6 +166,11 @@ struct tag {
 		 */
 		struct tag_acorn	acorn;
 
+		/*
+		 * OMAP specific
+                 */
+                struct tag_omap         omap;
+
 		/*
 		 * DC21285 specific
 		 */