ARM: reduce visibility of dmac_* functions

The dmac_* functions are private to the ARM DMA API implementation, and
should not be used by drivers. In order to discourage their use, remove
their prototypes and macros from asm/*.h.

We have to leave dmac_flush_range() behind as Exynos and MSM IOMMU code
use these; once these sites are fixed, this can be moved also.

Signed-off-by: Russell King <[e-mail]>

arch/arm/include/asm/cacheflush.h

···
  * is visible to DMA, or data written by DMA to system memory is
  * visible to the CPU.
  */
-#define dmac_map_area			cpu_cache.dma_map_area
-#define dmac_unmap_area			cpu_cache.dma_unmap_area
 #define dmac_flush_range		cpu_cache.dma_flush_range
 
 #else
···
  * is visible to DMA, or data written by DMA to system memory is
  * visible to the CPU.
  */
-extern void dmac_map_area(const void *, size_t, int);
-extern void dmac_unmap_area(const void *, size_t, int);
 extern void dmac_flush_range(const void *, const void *);
 
 #endif

arch/arm/include/asm/glue-cache.h

···
 #define __cpuc_coherent_user_range	__glue(_CACHE,_coherent_user_range)
 #define __cpuc_flush_dcache_area	__glue(_CACHE,_flush_kern_dcache_area)
 
-#define dmac_map_area			__glue(_CACHE,_dma_map_area)
-#define dmac_unmap_area			__glue(_CACHE,_dma_unmap_area)
 #define dmac_flush_range		__glue(_CACHE,_dma_flush_range)
 #endif
 

arch/arm/mm/dma-mapping.c

···
 #include <asm/system_info.h>
 #include <asm/dma-contiguous.h>
 
+#include "dma.h"
 #include "mm.h"
 
 /*

arch/arm/mm/dma.h

···
+#ifndef DMA_H
+#define DMA_H
+
+#include <asm/glue-cache.h>
+
+#ifndef MULTI_CACHE
+#define dmac_map_area			__glue(_CACHE,_dma_map_area)
+#define dmac_unmap_area 		__glue(_CACHE,_dma_unmap_area)
+
+/*
+ * These are private to the dma-mapping API.  Do not use directly.
+ * Their sole purpose is to ensure that data held in the cache
+ * is visible to DMA, or data written by DMA to system memory is
+ * visible to the CPU.
+ */
+extern void dmac_map_area(const void *, size_t, int);
+extern void dmac_unmap_area(const void *, size_t, int);
+
+#else
+
+/*
+ * These are private to the dma-mapping API.  Do not use directly.
+ * Their sole purpose is to ensure that data held in the cache
+ * is visible to DMA, or data written by DMA to system memory is
+ * visible to the CPU.
+ */
+#define dmac_map_area			cpu_cache.dma_map_area
+#define dmac_unmap_area 		cpu_cache.dma_unmap_area
+
+#endif
+
+#endif