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  */
   9 int dma_alloc_from_coherent(struct device *dev, ssize_t size,
  10                                        dma_addr_t *dma_handle, void **ret);
  11 int 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
  17 extern int
  18 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  19                             dma_addr_t device_addr, size_t size, int flags);
  20
  21 extern void
  22 dma_release_declared_memory(struct device *dev);
  23
  24 extern void *
  25 dma_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