sh: Use asm-generic/io.h

Convert the sh architecture to make use of the new asm-generic/io.h to
provide address mapping functions. As the generic implementations are
suitable for sh this is primarily a matter of moving code.

Feedback from architecture maintainers is welcome.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

arch/sh/include/asm/io.h

@@ -231,34 +231,7 @@ static inline void sync(void)
 #define setbits_8(addr, set) setbits(8, addr, set)
 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
 
-/*
- * 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".
- */
-#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)
-{
-
-}
-
-static inline phys_addr_t virt_to_phys(void *vaddr)
-{
-	return (phys_addr_t)(vaddr);
-}
+#include <asm-generic/io.h>
 
 #endif	/* __KERNEL__ */
 #endif	/* __ASM_SH_IO_H */