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 #include <linux/dma-direction.h>
  12
  13 #define dma_mapping_error(x, y) 0
  14
  15 static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
  16 {
  17         *handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
  18         return (void *)*handle;
  19 }
  20
  21 static inline void dma_free_coherent(void *addr)
  22 {
  23         free(addr);
  24 }
  25
  26 static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
  27                                            enum dma_data_direction dir)
  28 {
  29         return (unsigned long)vaddr;
  30 }
  31
  32 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  33                                     unsigned long paddr)
  34 {
  35 }
  36
  37 #endif /* __ASM_ARM_DMA_MAPPING_H */