[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>

3 files changed, 11 insertions, 2 deletions

diff --git a/arch/arm/mach-at91rm9200/common.c b/arch/arm/mach-at91rm9200/common.c
index 3848fd2d5596..40d29a73b5c5 100644
--- a/arch/arm/mach-at91rm9200/common.c
+++ b/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,
         },
 };
 
diff --git a/include/asm-arm/arch-at91rm9200/hardware.h b/include/asm-arm/arch-at91rm9200/hardware.h
index 59e6f44d3a0d..87f40df57140 100644
--- a/include/asm-arm/arch-at91rm9200/hardware.h
+++ b/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 */
 
diff --git a/include/asm-arm/arch-at91rm9200/vmalloc.h b/include/asm-arm/arch-at91rm9200/vmalloc.h
index 34d9718feb90..4c367eb57f47 100644
--- a/include/asm-arm/arch-at91rm9200/vmalloc.h
+++ b/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