Root/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

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