arch/nds32/include/asm/dma-mapping.h

   1 /*
   2  * Copyright (C) 2013 Andes Technology Corporation
   3  * Ken Kuo, Andes Technology Corporation <ken_kuo@andestech.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #ifndef __ASM_NDS_DMA_MAPPING_H
   8 #define __ASM_NDS_DMA_MAPPING_H
   9
  10 enum dma_data_direction {
  11         DMA_BIDIRECTIONAL       = 0,
  12         DMA_TO_DEVICE           = 1,
  13         DMA_FROM_DEVICE         = 2,
  14 };
  15
  16 static void *dma_alloc_coherent(size_t len, unsigned long *handle)
  17 {
  18         *handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
  19         return (void *)*handle;
  20 }
  21
  22 static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
  23                                            enum dma_data_direction dir)
  24 {
  25         return (unsigned long)vaddr;
  26 }
  27
  28 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  29                                     unsigned long paddr)
  30 {
  31 }
  32
  33 #endif /* __ASM_NDS_DMA_MAPPING_H */