arch/avr32/include/asm/dma-mapping.h

   1 /*
   2  * Copyright (C) 2006 Atmel Corporation
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6 #ifndef __ASM_AVR32_DMA_MAPPING_H
   7 #define __ASM_AVR32_DMA_MAPPING_H
   8
   9 #include <asm/io.h>
  10 #include <asm/arch/cacheflush.h>
  11
  12 enum dma_data_direction {
  13         DMA_BIDIRECTIONAL       = 0,
  14         DMA_TO_DEVICE           = 1,
  15         DMA_FROM_DEVICE         = 2,
  16 };
  17 extern void *dma_alloc_coherent(size_t len, unsigned long *handle);
  18
  19 static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
  20                                            enum dma_data_direction dir)
  21 {
  22         extern void __bad_dma_data_direction(void);
  23
  24         switch (dir) {
  25         case DMA_BIDIRECTIONAL:
  26                 dcache_flush_range(vaddr, len);
  27                 break;
  28         case DMA_TO_DEVICE:
  29                 dcache_clean_range(vaddr, len);
  30                 break;
  31         case DMA_FROM_DEVICE:
  32                 dcache_invalidate_range(vaddr, len);
  33                 break;
  34         default:
  35                 /* This will cause a linker error */
  36                 __bad_dma_data_direction();
  37         }
  38
  39         return virt_to_phys(vaddr);
  40 }
  41
  42 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  43                                     unsigned long paddr)
  44 {
  45
  46 }
  47
  48 #endif /* __ASM_AVR32_DMA_MAPPING_H */