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 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
20 				dma_addr_t device_addr, size_t size, int flags);
21 
22 void dma_release_declared_memory(struct device *dev);
23 
24 void *dma_mark_declared_memory_occupied(struct device *dev,
25 					dma_addr_t device_addr, size_t size);
26 #else
27 #define dma_alloc_from_coherent(dev, size, handle, ret) (0)
28 #define dma_release_from_coherent(dev, order, vaddr) (0)
29 #define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
30 #endif
31 
32 #endif
33