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 #define dma_mapping_error(x, y) 0
  12
  13 enum dma_data_direction {
  14         DMA_BIDIRECTIONAL       = 0,
  15         DMA_TO_DEVICE           = 1,
  16         DMA_FROM_DEVICE         = 2,
  17 };
  18
  19 static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
  20 {
  21         *handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
  22         return (void *)*handle;
  23 }
  24
  25 static inline void dma_free_coherent(void *addr)
  26 {
  27         free(addr);
  28 }
  29
  30 static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
  31                                            enum dma_data_direction dir)
  32 {
  33         return (unsigned long)vaddr;
  34 }
  35
  36 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  37                                     unsigned long paddr)
  38 {
  39 }
  40
  41 #endif /* __ASM_ARM_DMA_MAPPING_H */