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                 flush_dcache_range((unsigned long)vaddr,
  27                                    (unsigned long)vaddr + len);
  28                 break;
  29         case DMA_TO_DEVICE:
  30                 dcache_clean_range(vaddr, len);
  31                 break;
  32         case DMA_FROM_DEVICE:
  33                 invalidate_dcache_range((unsigned long)vaddr,
  34                                         (unsigned long)vaddr + len);
  35                 break;
  36         default:
  37                 /* This will cause a linker error */
  38                 __bad_dma_data_direction();
  39         }
  40
  41         return virt_to_phys(vaddr);
  42 }
  43
  44 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  45                                     unsigned long paddr)
  46 {
  47
  48 }
  49
  50 #endif /* __ASM_AVR32_DMA_MAPPING_H */