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
  18 static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
  19 {
  20         *handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
  21         return (void *)*handle;
  22 }
  23
  24 static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
  25                                            enum dma_data_direction dir)
  26 {
  27         extern void __bad_dma_data_direction(void);
  28
  29         switch (dir) {
  30         case DMA_BIDIRECTIONAL:
  31                 flush_dcache_range((unsigned long)vaddr,
  32                                    (unsigned long)vaddr + len);
  33                 break;
  34         case DMA_TO_DEVICE:
  35                 dcache_clean_range(vaddr, len);
  36                 break;
  37         case DMA_FROM_DEVICE:
  38                 invalidate_dcache_range((unsigned long)vaddr,
  39                                         (unsigned long)vaddr + len);
  40                 break;
  41         default:
  42                 /* This will cause a linker error */
  43                 __bad_dma_data_direction();
  44         }
  45
  46         return virt_to_phys(vaddr);
  47 }
  48
  49 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  50                                     unsigned long paddr)
  51 {
  52
  53 }
  54
  55 #endif /* __ASM_AVR32_DMA_MAPPING_H */