[ARM] 3581/1: AT91RM9200 Internal SRAM

Patch from Andrew Victor

This patch maps the AT91RM9200's internal SRAM into the virtual memory
address space - just below the internal peripheral registers.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-at91rm9200/common.c

@@ -17,6 +17,7 @@
 #include <asm/mach/map.h>
 
 #include <asm/arch/hardware.h>
+#include "generic.h"
 
 static struct map_desc at91rm9200_io_desc[] __initdata = {
 	{
@@ -94,6 +95,11 @@ static struct map_desc at91rm9200_io_desc[] __initdata = {
 		.pfn		= __phys_to_pfn(AT91_BASE_TCB0),
 		.length		= SZ_16K,
 		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_SRAM_VIRT_BASE,
+		.pfn		= __phys_to_pfn(AT91_SRAM_BASE),
+		.length		= AT91_SRAM_SIZE,
+		.type		= MT_DEVICE,
 	},
 };
 

include/asm-arm/arch-at91rm9200/hardware.h

@@ -50,9 +50,12 @@
 #define AT91_VA_BASE_TCB0	AT91_IO_P2V(AT91_BASE_TCB0)
 
 /* Internal SRAM */
-#define AT91_BASE_SRAM		0x00200000	/* Internal SRAM base address */
+#define AT91_SRAM_BASE		0x00200000	/* Internal SRAM base address */
 #define AT91_SRAM_SIZE		0x00004000	/* Internal SRAM SIZE (16Kb) */
 
+ /* Internal SRAM is mapped below the IO devices */
+#define AT91_SRAM_VIRT_BASE	(AT91_IO_VIRT_BASE - AT91_SRAM_SIZE)
+
 /* Serial ports */
 #define AT91_NR_UART		5		/* 4 USART3's and one DBGU port */
 

include/asm-arm/arch-at91rm9200/vmalloc.h

@@ -21,6 +21,6 @@
 #ifndef __ASM_ARCH_VMALLOC_H
 #define __ASM_ARCH_VMALLOC_H
 
-#define VMALLOC_END		(AT91_IO_VIRT_BASE & PGDIR_MASK)
+#define VMALLOC_END		(AT91_SRAM_VIRT_BASE & PGDIR_MASK)
 
 #endif