at91: add arch specific ioremap support

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>

2 files changed, 29 insertions, 1 deletions

diff --git a/arch/arm/mach-at91/include/mach/io.h b/arch/arm/mach-at91/include/mach/io.h
index 0b0cccc46e68..4298e7806c76 100644
--- a/arch/arm/mach-at91/include/mach/io.h
+++ b/arch/arm/mach-at91/include/mach/io.h
@@ -21,14 +21,23 @@
 #ifndef __ASM_ARCH_IO_H
 #define __ASM_ARCH_IO_H
 
+#include <mach/hardware.h>
+
 #define IO_SPACE_LIMIT          0xFFFFFFFF
 
 #define __io(a)         __typesafe_io(a)
 #define __mem_pci(a)    (a)
 
-
 #ifndef __ASSEMBLY__
 
+#ifndef CONFIG_ARCH_AT91X40
+#define __arch_ioremap  at91_ioremap
+#define __arch_iounmap  at91_iounmap
+#endif
+
+void __iomem *at91_ioremap(unsigned long phys, size_t size, unsigned int type);
+void at91_iounmap(volatile void __iomem *addr);
+
 static inline unsigned int at91_sys_read(unsigned int reg_offset)
 {
         void __iomem *addr = (void __iomem *)AT91_VA_BASE_SYS;
diff --git a/arch/arm/mach-at91/setup.c b/arch/arm/mach-at91/setup.c
index 816599fce55b..aa64294c7db3 100644
--- a/arch/arm/mach-at91/setup.c
+++ b/arch/arm/mach-at91/setup.c
@@ -7,6 +7,7 @@
 
 #include <linux/module.h>
 #include <linux/io.h>
+#include <linux/mm.h>
 
 #include <asm/mach/map.h>
 
@@ -72,6 +73,24 @@ static struct map_desc at91_io_desc __initdata = {
         .type           = MT_DEVICE,
 };
 
+void __iomem *at91_ioremap(unsigned long p, size_t size, unsigned int type)
+{
+        if (p >= AT91_BASE_SYS && p <= (AT91_BASE_SYS + SZ_16K - 1))
+                return (void __iomem *)AT91_IO_P2V(p);
+
+        return __arm_ioremap_caller(p, size, type, __builtin_return_address(0));
+}
+EXPORT_SYMBOL(at91_ioremap);
+
+void at91_iounmap(volatile void __iomem *addr)
+{
+        unsigned long virt = (unsigned long)addr;
+
+        if (virt >= VMALLOC_START && virt < VMALLOC_END)
+                __iounmap(addr);
+}
+EXPORT_SYMBOL(at91_iounmap);
+
 #define AT91_DBGU0      0xfffff200
 #define AT91_DBGU1      0xffffee00