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 three 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 int 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
  19 extern int
  20 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  21                             dma_addr_t device_addr, size_t size, int flags);
  22
  23 extern void
  24 dma_release_declared_memory(struct device *dev);
  25
  26 extern void *
  27 dma_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