root/arch/arm/mm/dma.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef DMA_H
   3 #define DMA_H
   4 
   5 #include <asm/glue-cache.h>
   6 
   7 #ifndef MULTI_CACHE
   8 #define dmac_map_area                   __glue(_CACHE,_dma_map_area)
   9 #define dmac_unmap_area                 __glue(_CACHE,_dma_unmap_area)
  10 
  11 /*
  12  * These are private to the dma-mapping API.  Do not use directly.
  13  * Their sole purpose is to ensure that data held in the cache
  14  * is visible to DMA, or data written by DMA to system memory is
  15  * visible to the CPU.
  16  */
  17 extern void dmac_map_area(const void *, size_t, int);
  18 extern void dmac_unmap_area(const void *, size_t, int);
  19 
  20 #else
  21 
  22 /*
  23  * These are private to the dma-mapping API.  Do not use directly.
  24  * Their sole purpose is to ensure that data held in the cache
  25  * is visible to DMA, or data written by DMA to system memory is
  26  * visible to the CPU.
  27  */
  28 #define dmac_map_area                   cpu_cache.dma_map_area
  29 #define dmac_unmap_area                 cpu_cache.dma_unmap_area
  30 
  31 #endif
  32 
  33 #endif