powerpc: Use asm-generic/io.h

Convert the powerpc architecture to make use of the new asm-generic/io.h
to provide address mapping functions. As powerpc can actually perform
non-identity mapping between physical & virtual addresses we can't
simply make use of the generic phys_to_virt() & virt_to_phys()
functions. However since map_physmem() already effectively implemented
the same thing as virt_to_phys() we can simply implement virt_to_phys()
instead of map_physmem() & use the generic map_physmem(). We also drop
the no-op unmap_physmem().

This has only been build-tested, feedback from architecture maintainers
is welcome.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Wolfgang Denk <wd@denx.de>

arch/powerpc/include/asm/io.h

@@ -282,18 +282,7 @@ static inline void out_be32(volatile unsigned __iomem *addr, u32 val)
 #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)
+static inline void *phys_to_virt(phys_addr_t paddr)
 {
 #ifdef CONFIG_ADDR_MAP
 	return addrmap_phys_to_virt(paddr);
@@ -301,14 +290,7 @@ map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
 	return (void *)((unsigned long)paddr);
 #endif
 }
-
-/*
- * Take down a mapping set up by map_physmem().
- */
-static inline void unmap_physmem(void *vaddr, unsigned long flags)
-{
-
-}
+#define phys_to_virt phys_to_virt
 
 static inline phys_addr_t virt_to_phys(void * vaddr)
 {
@@ -318,5 +300,8 @@ static inline phys_addr_t virt_to_phys(void * vaddr)
 	return (phys_addr_t)((unsigned long)vaddr);
 #endif
 }
+#define virt_to_phys virt_to_phys
+
+#include <asm-generic/io.h>
 
 #endif