2 * Copyright 2004-2009 Analog Devices Inc.
4 * Licensed under the GPL-2 or later.
7 #ifndef _BLACKFIN_DMA_MAPPING_H
8 #define _BLACKFIN_DMA_MAPPING_H
10 #include <asm/cacheflush.h>
13 void *dma_alloc_coherent(struct device *dev, size_t size,
14 dma_addr_t *dma_handle, gfp_t gfp);
15 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
16 dma_addr_t dma_handle);
19 * Now for the API extensions over the pci_ one
21 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
22 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
23 #define dma_supported(d, m) (1)
24 #define dma_get_cache_alignment() (32)
25 #define dma_is_consistent(d, h) (1)
28 dma_set_mask(struct device *dev, u64 dma_mask)
30 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
33 *dev->dma_mask = dma_mask;
39 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
45 __dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
47 _dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
49 if (!__builtin_constant_p(dir)) {
50 __dma_sync(addr, size, dir);
57 case DMA_TO_DEVICE: /* writeback only */
58 flush_dcache_range(addr, addr + size);
60 case DMA_FROM_DEVICE: /* invalidate only */
61 case DMA_BIDIRECTIONAL: /* flush and invalidate */
62 /* Blackfin has no dedicated invalidate (it includes a flush) */
63 invalidate_dcache_range(addr, addr + size);
69 * Map a single buffer of the indicated size for DMA in streaming mode.
70 * The 32-bit bus address to use is returned.
72 * Once the device is given the dma address, the device owns this memory
73 * until either pci_unmap_single or pci_dma_sync_single is performed.
75 static inline dma_addr_t
76 dma_map_single(struct device *dev, void *ptr, size_t size,
77 enum dma_data_direction dir)
79 _dma_sync((dma_addr_t)ptr, size, dir);
80 return (dma_addr_t) ptr;
83 static inline dma_addr_t
84 dma_map_page(struct device *dev, struct page *page,
85 unsigned long offset, size_t size,
86 enum dma_data_direction dir)
88 return dma_map_single(dev, page_address(page) + offset, size, dir);
92 * Unmap a single streaming mode DMA translation. The dma_addr and size
93 * must match what was provided for in a previous pci_map_single call. All
94 * other usages are undefined.
96 * After this call, reads by the cpu to the buffer are guarenteed to see
97 * whatever the device wrote there.
100 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
101 enum dma_data_direction dir)
103 BUG_ON(!valid_dma_direction(dir));
107 dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
108 enum dma_data_direction dir)
110 dma_unmap_single(dev, dma_addr, size, dir);
114 * Map a set of buffers described by scatterlist in streaming
115 * mode for DMA. This is the scather-gather version of the
116 * above pci_map_single interface. Here the scatter gather list
117 * elements are each tagged with the appropriate dma address
118 * and length. They are obtained via sg_dma_{address,length}(SG).
120 * NOTE: An implementation may be able to use a smaller number of
121 * DMA address/length pairs than there are SG table elements.
122 * (for example via virtual mapping capabilities)
123 * The routine returns the number of addr/length pairs actually
124 * used, at most nents.
126 * Device ownership issues as mentioned above for pci_map_single are
129 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
130 enum dma_data_direction dir);
133 * Unmap a set of streaming mode DMA translations.
134 * Again, cpu read rules concerning calls here are the same as for
135 * pci_unmap_single() above.
138 dma_unmap_sg(struct device *dev, struct scatterlist *sg,
139 int nhwentries, enum dma_data_direction dir)
141 BUG_ON(!valid_dma_direction(dir));
145 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
146 unsigned long offset, size_t size,
147 enum dma_data_direction dir)
149 BUG_ON(!valid_dma_direction(dir));
153 dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
154 unsigned long offset, size_t size,
155 enum dma_data_direction dir)
157 _dma_sync(handle + offset, size, dir);
161 dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
162 enum dma_data_direction dir)
164 dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
168 dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
169 enum dma_data_direction dir)
171 dma_sync_single_range_for_device(dev, handle, 0, size, dir);
175 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
176 enum dma_data_direction dir)
178 BUG_ON(!valid_dma_direction(dir));
182 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
183 int nents, enum dma_data_direction dir);
186 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
187 enum dma_data_direction dir)
189 _dma_sync((dma_addr_t)vaddr, size, dir);
192 #endif /* _BLACKFIN_DMA_MAPPING_H */