sh: Add support of map_physmem() and unmap_physmem() to SuperH

This patch add the support of map_physmem() and unmap_physmem()
used with Common Flash Interface(CFI) driver.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

include/asm-sh/io.h

@@ -227,5 +227,32 @@ out:
 static inline void sync(void)
 {
 }
+
+/*
+ * Given a physical address and a length, return a virtual address
+ * that can be used to access the memory range with the caching
+ * properties specified by "flags".
+ */
+typedef unsigned long phys_addr_t;
+
+#define MAP_NOCACHE     (0)
+#define MAP_WRCOMBINE   (0)
+#define MAP_WRBACK      (0)
+#define MAP_WRTHROUGH   (0)
+
+static inline void *
+map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
+{
+	return (void *)paddr;
+}
+
+/*
+ * Take down a mapping set up by map_physmem().
+ */
+static inline void unmap_physmem(void *vaddr, unsigned long flags)
+{
+
+}
+
 #endif	/* __KERNEL__ */
 #endif	/* __ASM_SH_IO_H */