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-rw-r--r--arch/blackfin/include/asm/dma-mapping.h83
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diff --git a/arch/blackfin/include/asm/dma-mapping.h b/arch/blackfin/include/asm/dma-mapping.h
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1#ifndef _BLACKFIN_DMA_MAPPING_H
2#define _BLACKFIN_DMA_MAPPING_H
3
4#include <asm/scatterlist.h>
5
6void dma_alloc_init(unsigned long start, unsigned long end);
7void *dma_alloc_coherent(struct device *dev, size_t size,
8 dma_addr_t *dma_handle, gfp_t gfp);
9void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
10 dma_addr_t dma_handle);
11
12/*
13 * Now for the API extensions over the pci_ one
14 */
15#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
16#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
17
18#define dma_mapping_error
19
20/*
21 * Map a single buffer of the indicated size for DMA in streaming mode.
22 * The 32-bit bus address to use is returned.
23 *
24 * Once the device is given the dma address, the device owns this memory
25 * until either pci_unmap_single or pci_dma_sync_single is performed.
26 */
27extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
28 enum dma_data_direction direction);
29
30static inline dma_addr_t
31dma_map_page(struct device *dev, struct page *page,
32 unsigned long offset, size_t size,
33 enum dma_data_direction dir)
34{
35 return dma_map_single(dev, page_address(page) + offset, size, dir);
36}
37
38/*
39 * Unmap a single streaming mode DMA translation. The dma_addr and size
40 * must match what was provided for in a previous pci_map_single call. All
41 * other usages are undefined.
42 *
43 * After this call, reads by the cpu to the buffer are guarenteed to see
44 * whatever the device wrote there.
45 */
46extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
47 enum dma_data_direction direction);
48
49static inline void
50dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
51 enum dma_data_direction dir)
52{
53 dma_unmap_single(dev, dma_addr, size, dir);
54}
55
56/*
57 * Map a set of buffers described by scatterlist in streaming
58 * mode for DMA. This is the scather-gather version of the
59 * above pci_map_single interface. Here the scatter gather list
60 * elements are each tagged with the appropriate dma address
61 * and length. They are obtained via sg_dma_{address,length}(SG).
62 *
63 * NOTE: An implementation may be able to use a smaller number of
64 * DMA address/length pairs than there are SG table elements.
65 * (for example via virtual mapping capabilities)
66 * The routine returns the number of addr/length pairs actually
67 * used, at most nents.
68 *
69 * Device ownership issues as mentioned above for pci_map_single are
70 * the same here.
71 */
72extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
73 enum dma_data_direction direction);
74
75/*
76 * Unmap a set of streaming mode DMA translations.
77 * Again, cpu read rules concerning calls here are the same as for
78 * pci_unmap_single() above.
79 */
80extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
81 int nhwentries, enum dma_data_direction direction);
82
83#endif /* _BLACKFIN_DMA_MAPPING_H */