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

   1 /*
   2  * (C) Copyright 2007
   3  * Stelian Pop <stelian@popies.net>
   4  * Lead Tech Design <www.leadtechdesign.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8 #ifndef __ASM_ARM_DMA_MAPPING_H
   9 #define __ASM_ARM_DMA_MAPPING_H
  10
  11 enum dma_data_direction {
  12         DMA_BIDIRECTIONAL       = 0,
  13         DMA_TO_DEVICE           = 1,
  14         DMA_FROM_DEVICE         = 2,
  15 };
  16
  17 static void *dma_alloc_coherent(size_t len, unsigned long *handle)
  18 {
  19         *handle = (unsigned long)malloc(len);
  20         return (void *)*handle;
  21 }
  22
  23 static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
  24                                            enum dma_data_direction dir)
  25 {
  26         return (unsigned long)vaddr;
  27 }
  28
  29 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  30                                     unsigned long paddr)
  31 {
  32 }
  33
  34 #endif /* __ASM_ARM_DMA_MAPPING_H */