fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-blackfin / dma-mapping.h
blob282fabccf6a6204b64b9caff45de5bcd2ee3da8c
1 #ifndef _BLACKFIN_DMA_MAPPING_H
2 #define _BLACKFIN_DMA_MAPPING_H
4 #include <asm/scatterlist.h>
6 void dma_alloc_init(unsigned long start, unsigned long end);
7 void *dma_alloc_coherent(struct device *dev, size_t size,
8 dma_addr_t *dma_handle, gfp_t gfp);
9 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
10 dma_addr_t dma_handle);
13 * Now for the API extensions over the pci_ one
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)
18 #define dma_mapping_error
21 * Map a single buffer of the indicated size for DMA in streaming mode.
22 * The 32-bit bus address to use is returned.
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.
27 extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
28 enum dma_data_direction direction);
31 * Unmap a single streaming mode DMA translation. The dma_addr and size
32 * must match what was provided for in a previous pci_map_single call. All
33 * other usages are undefined.
35 * After this call, reads by the cpu to the buffer are guarenteed to see
36 * whatever the device wrote there.
38 extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
39 enum dma_data_direction direction);
42 * Map a set of buffers described by scatterlist in streaming
43 * mode for DMA. This is the scather-gather version of the
44 * above pci_map_single interface. Here the scatter gather list
45 * elements are each tagged with the appropriate dma address
46 * and length. They are obtained via sg_dma_{address,length}(SG).
48 * NOTE: An implementation may be able to use a smaller number of
49 * DMA address/length pairs than there are SG table elements.
50 * (for example via virtual mapping capabilities)
51 * The routine returns the number of addr/length pairs actually
52 * used, at most nents.
54 * Device ownership issues as mentioned above for pci_map_single are
55 * the same here.
57 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
58 enum dma_data_direction direction);
61 * Unmap a set of streaming mode DMA translations.
62 * Again, cpu read rules concerning calls here are the same as for
63 * pci_unmap_single() above.
65 extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
66 int nhwentries, enum dma_data_direction direction);
68 #endif /* _BLACKFIN_DMA_MAPPING_H */