LXR linux/include/asm-generic/dma-coherent.h

   1#ifndef DMA_COHERENT_H
   2#define DMA_COHERENT_H
   3
   4#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
   5/*
   6 * These two 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
  13/*
  14 * Standard interface
  15 */
  16#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  17extern int
  18dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  19                            dma_addr_t device_addr, size_t size, int flags);
  20
  21extern void
  22dma_release_declared_memory(struct device *dev);
  23
  24extern void *
  25dma_mark_declared_memory_occupied(struct device *dev,
  26                                  dma_addr_t device_addr, size_t size);
  27#else
  28#define dma_alloc_from_coherent(dev, size, handle, ret) (0)
  29#define dma_release_from_coherent(dev, order, vaddr) (0)
  30#endif
  31
  32#endif
  33