linux/include/asm-generic/dma-coherent.h
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   1#ifndef DMA_COHERENT_H
   2#define DMA_COHERENT_H
   3
   4#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
   5/*
   6 * These three functions are only for dma allocator.
   7 * Don't use them in device drivers.
   8 */
   9int dma_alloc_from_coherent(struct device *dev, ssize_t size,
  10                                       dma_addr_t *dma_handle, void **ret);
  11int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
  12
  13int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
  14                            void *cpu_addr, size_t size, int *ret);
  15/*
  16 * Standard interface
  17 */
  18#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  19extern int
  20dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  21                            dma_addr_t device_addr, size_t size, int flags);
  22
  23extern void
  24dma_release_declared_memory(struct device *dev);
  25
  26extern void *
  27dma_mark_declared_memory_occupied(struct device *dev,
  28                                  dma_addr_t device_addr, size_t size);
  29#else
  30#define dma_alloc_from_coherent(dev, size, handle, ret) (0)
  31#define dma_release_from_coherent(dev, order, vaddr) (0)
  32#define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
  33#endif
  34
  35#endif
  36
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