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_inline(dma_addr_t addr, size_t size, enum dma_data_direction dir)
52 case DMA_TO_DEVICE: /* writeback only */
53 flush_dcache_range(addr, addr + size);
55 case DMA_FROM_DEVICE: /* invalidate only */
56 case DMA_BIDIRECTIONAL: /* flush and invalidate */
57 /* Blackfin has no dedicated invalidate (it includes a flush) */
58 invalidate_dcache_range(addr, addr + size);
63 _dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
65 if (__builtin_constant_p(dir))
66 __dma_sync_inline(addr, size, dir);
68 __dma_sync(addr, size, dir);
72 * Map a single buffer of the indicated size for DMA in streaming mode.
73 * The 32-bit bus address to use is returned.
75 * Once the device is given the dma address, the device owns this memory
76 * until either pci_unmap_single or pci_dma_sync_single is performed.
78 static inline dma_addr_t
79 dma_map_single(struct device *dev, void *ptr, size_t size,
80 enum dma_data_direction dir)
82 _dma_sync((dma_addr_t)ptr, size, dir);
83 return (dma_addr_t) ptr;
86 static inline dma_addr_t
87 dma_map_page(struct device *dev, struct page *page,
88 unsigned long offset, size_t size,
89 enum dma_data_direction dir)
91 return dma_map_single(dev, page_address(page) + offset, size, dir);
95 * Unmap a single streaming mode DMA translation. The dma_addr and size
96 * must match what was provided for in a previous pci_map_single call. All
97 * other usages are undefined.
99 * After this call, reads by the cpu to the buffer are guarenteed to see
100 * whatever the device wrote there.
103 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
104 enum dma_data_direction dir)
106 BUG_ON(!valid_dma_direction(dir));
110 dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
111 enum dma_data_direction dir)
113 dma_unmap_single(dev, dma_addr, size, dir);
117 * Map a set of buffers described by scatterlist in streaming
118 * mode for DMA. This is the scather-gather version of the
119 * above pci_map_single interface. Here the scatter gather list
120 * elements are each tagged with the appropriate dma address
121 * and length. They are obtained via sg_dma_{address,length}(SG).
123 * NOTE: An implementation may be able to use a smaller number of
124 * DMA address/length pairs than there are SG table elements.
125 * (for example via virtual mapping capabilities)
126 * The routine returns the number of addr/length pairs actually
127 * used, at most nents.
129 * Device ownership issues as mentioned above for pci_map_single are
132 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
133 enum dma_data_direction dir);
136 * Unmap a set of streaming mode DMA translations.
137 * Again, cpu read rules concerning calls here are the same as for
138 * pci_unmap_single() above.
141 dma_unmap_sg(struct device *dev, struct scatterlist *sg,
142 int nhwentries, enum dma_data_direction dir)
144 BUG_ON(!valid_dma_direction(dir));
148 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
149 unsigned long offset, size_t size,
150 enum dma_data_direction dir)
152 BUG_ON(!valid_dma_direction(dir));
156 dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
157 unsigned long offset, size_t size,
158 enum dma_data_direction dir)
160 _dma_sync(handle + offset, size, dir);
164 dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
165 enum dma_data_direction dir)
167 dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
171 dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
172 enum dma_data_direction dir)
174 dma_sync_single_range_for_device(dev, handle, 0, size, dir);
178 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
179 enum dma_data_direction dir)
181 BUG_ON(!valid_dma_direction(dir));
185 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
186 int nents, enum dma_data_direction dir);
189 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
190 enum dma_data_direction dir)
192 _dma_sync((dma_addr_t)vaddr, size, dir);
195 #endif /* _BLACKFIN_DMA_MAPPING_H */