Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame^] | 1 | #ifndef __ASM_AVR32_DMA_MAPPING_H |
| 2 | #define __ASM_AVR32_DMA_MAPPING_H |
| 3 | |
| 4 | #include <linux/mm.h> |
| 5 | #include <linux/device.h> |
| 6 | #include <asm/scatterlist.h> |
| 7 | #include <asm/processor.h> |
| 8 | #include <asm/cacheflush.h> |
| 9 | #include <asm/io.h> |
| 10 | |
| 11 | extern void dma_cache_sync(void *vaddr, size_t size, int direction); |
| 12 | |
| 13 | /* |
| 14 | * Return whether the given device DMA address mask can be supported |
| 15 | * properly. For example, if your device can only drive the low 24-bits |
| 16 | * during bus mastering, then you would pass 0x00ffffff as the mask |
| 17 | * to this function. |
| 18 | */ |
| 19 | static inline int dma_supported(struct device *dev, u64 mask) |
| 20 | { |
| 21 | /* Fix when needed. I really don't know of any limitations */ |
| 22 | return 1; |
| 23 | } |
| 24 | |
| 25 | static inline int dma_set_mask(struct device *dev, u64 dma_mask) |
| 26 | { |
| 27 | if (!dev->dma_mask || !dma_supported(dev, dma_mask)) |
| 28 | return -EIO; |
| 29 | |
| 30 | *dev->dma_mask = dma_mask; |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * dma_alloc_coherent - allocate consistent memory for DMA |
| 36 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 37 | * @size: required memory size |
| 38 | * @handle: bus-specific DMA address |
| 39 | * |
| 40 | * Allocate some uncached, unbuffered memory for a device for |
| 41 | * performing DMA. This function allocates pages, and will |
| 42 | * return the CPU-viewed address, and sets @handle to be the |
| 43 | * device-viewed address. |
| 44 | */ |
| 45 | extern void *dma_alloc_coherent(struct device *dev, size_t size, |
| 46 | dma_addr_t *handle, gfp_t gfp); |
| 47 | |
| 48 | /** |
| 49 | * dma_free_coherent - free memory allocated by dma_alloc_coherent |
| 50 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 51 | * @size: size of memory originally requested in dma_alloc_coherent |
| 52 | * @cpu_addr: CPU-view address returned from dma_alloc_coherent |
| 53 | * @handle: device-view address returned from dma_alloc_coherent |
| 54 | * |
| 55 | * Free (and unmap) a DMA buffer previously allocated by |
| 56 | * dma_alloc_coherent(). |
| 57 | * |
| 58 | * References to memory and mappings associated with cpu_addr/handle |
| 59 | * during and after this call executing are illegal. |
| 60 | */ |
| 61 | extern void dma_free_coherent(struct device *dev, size_t size, |
| 62 | void *cpu_addr, dma_addr_t handle); |
| 63 | |
| 64 | /** |
| 65 | * dma_alloc_writecombine - allocate write-combining memory for DMA |
| 66 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 67 | * @size: required memory size |
| 68 | * @handle: bus-specific DMA address |
| 69 | * |
| 70 | * Allocate some uncached, buffered memory for a device for |
| 71 | * performing DMA. This function allocates pages, and will |
| 72 | * return the CPU-viewed address, and sets @handle to be the |
| 73 | * device-viewed address. |
| 74 | */ |
| 75 | extern void *dma_alloc_writecombine(struct device *dev, size_t size, |
| 76 | dma_addr_t *handle, gfp_t gfp); |
| 77 | |
| 78 | /** |
| 79 | * dma_free_coherent - free memory allocated by dma_alloc_writecombine |
| 80 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 81 | * @size: size of memory originally requested in dma_alloc_writecombine |
| 82 | * @cpu_addr: CPU-view address returned from dma_alloc_writecombine |
| 83 | * @handle: device-view address returned from dma_alloc_writecombine |
| 84 | * |
| 85 | * Free (and unmap) a DMA buffer previously allocated by |
| 86 | * dma_alloc_writecombine(). |
| 87 | * |
| 88 | * References to memory and mappings associated with cpu_addr/handle |
| 89 | * during and after this call executing are illegal. |
| 90 | */ |
| 91 | extern void dma_free_writecombine(struct device *dev, size_t size, |
| 92 | void *cpu_addr, dma_addr_t handle); |
| 93 | |
| 94 | /** |
| 95 | * dma_map_single - map a single buffer for streaming DMA |
| 96 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 97 | * @cpu_addr: CPU direct mapped address of buffer |
| 98 | * @size: size of buffer to map |
| 99 | * @dir: DMA transfer direction |
| 100 | * |
| 101 | * Ensure that any data held in the cache is appropriately discarded |
| 102 | * or written back. |
| 103 | * |
| 104 | * The device owns this memory once this call has completed. The CPU |
| 105 | * can regain ownership by calling dma_unmap_single() or dma_sync_single(). |
| 106 | */ |
| 107 | static inline dma_addr_t |
| 108 | dma_map_single(struct device *dev, void *cpu_addr, size_t size, |
| 109 | enum dma_data_direction direction) |
| 110 | { |
| 111 | dma_cache_sync(cpu_addr, size, direction); |
| 112 | return virt_to_bus(cpu_addr); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * dma_unmap_single - unmap a single buffer previously mapped |
| 117 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 118 | * @handle: DMA address of buffer |
| 119 | * @size: size of buffer to map |
| 120 | * @dir: DMA transfer direction |
| 121 | * |
| 122 | * Unmap a single streaming mode DMA translation. The handle and size |
| 123 | * must match what was provided in the previous dma_map_single() call. |
| 124 | * All other usages are undefined. |
| 125 | * |
| 126 | * After this call, reads by the CPU to the buffer are guaranteed to see |
| 127 | * whatever the device wrote there. |
| 128 | */ |
| 129 | static inline void |
| 130 | dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, |
| 131 | enum dma_data_direction direction) |
| 132 | { |
| 133 | |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * dma_map_page - map a portion of a page for streaming DMA |
| 138 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 139 | * @page: page that buffer resides in |
| 140 | * @offset: offset into page for start of buffer |
| 141 | * @size: size of buffer to map |
| 142 | * @dir: DMA transfer direction |
| 143 | * |
| 144 | * Ensure that any data held in the cache is appropriately discarded |
| 145 | * or written back. |
| 146 | * |
| 147 | * The device owns this memory once this call has completed. The CPU |
| 148 | * can regain ownership by calling dma_unmap_page() or dma_sync_single(). |
| 149 | */ |
| 150 | static inline dma_addr_t |
| 151 | dma_map_page(struct device *dev, struct page *page, |
| 152 | unsigned long offset, size_t size, |
| 153 | enum dma_data_direction direction) |
| 154 | { |
| 155 | return dma_map_single(dev, page_address(page) + offset, |
| 156 | size, direction); |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * dma_unmap_page - unmap a buffer previously mapped through dma_map_page() |
| 161 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 162 | * @handle: DMA address of buffer |
| 163 | * @size: size of buffer to map |
| 164 | * @dir: DMA transfer direction |
| 165 | * |
| 166 | * Unmap a single streaming mode DMA translation. The handle and size |
| 167 | * must match what was provided in the previous dma_map_single() call. |
| 168 | * All other usages are undefined. |
| 169 | * |
| 170 | * After this call, reads by the CPU to the buffer are guaranteed to see |
| 171 | * whatever the device wrote there. |
| 172 | */ |
| 173 | static inline void |
| 174 | dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, |
| 175 | enum dma_data_direction direction) |
| 176 | { |
| 177 | dma_unmap_single(dev, dma_address, size, direction); |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * dma_map_sg - map a set of SG buffers for streaming mode DMA |
| 182 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 183 | * @sg: list of buffers |
| 184 | * @nents: number of buffers to map |
| 185 | * @dir: DMA transfer direction |
| 186 | * |
| 187 | * Map a set of buffers described by scatterlist in streaming |
| 188 | * mode for DMA. This is the scatter-gather version of the |
| 189 | * above pci_map_single interface. Here the scatter gather list |
| 190 | * elements are each tagged with the appropriate dma address |
| 191 | * and length. They are obtained via sg_dma_{address,length}(SG). |
| 192 | * |
| 193 | * NOTE: An implementation may be able to use a smaller number of |
| 194 | * DMA address/length pairs than there are SG table elements. |
| 195 | * (for example via virtual mapping capabilities) |
| 196 | * The routine returns the number of addr/length pairs actually |
| 197 | * used, at most nents. |
| 198 | * |
| 199 | * Device ownership issues as mentioned above for pci_map_single are |
| 200 | * the same here. |
| 201 | */ |
| 202 | static inline int |
| 203 | dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 204 | enum dma_data_direction direction) |
| 205 | { |
| 206 | int i; |
| 207 | |
| 208 | for (i = 0; i < nents; i++) { |
| 209 | char *virt; |
| 210 | |
| 211 | sg[i].dma_address = page_to_bus(sg[i].page) + sg[i].offset; |
| 212 | virt = page_address(sg[i].page) + sg[i].offset; |
| 213 | dma_cache_sync(virt, sg[i].length, direction); |
| 214 | } |
| 215 | |
| 216 | return nents; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg |
| 221 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 222 | * @sg: list of buffers |
| 223 | * @nents: number of buffers to map |
| 224 | * @dir: DMA transfer direction |
| 225 | * |
| 226 | * Unmap a set of streaming mode DMA translations. |
| 227 | * Again, CPU read rules concerning calls here are the same as for |
| 228 | * pci_unmap_single() above. |
| 229 | */ |
| 230 | static inline void |
| 231 | dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, |
| 232 | enum dma_data_direction direction) |
| 233 | { |
| 234 | |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * dma_sync_single_for_cpu |
| 239 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 240 | * @handle: DMA address of buffer |
| 241 | * @size: size of buffer to map |
| 242 | * @dir: DMA transfer direction |
| 243 | * |
| 244 | * Make physical memory consistent for a single streaming mode DMA |
| 245 | * translation after a transfer. |
| 246 | * |
| 247 | * If you perform a dma_map_single() but wish to interrogate the |
| 248 | * buffer using the cpu, yet do not wish to teardown the DMA mapping, |
| 249 | * you must call this function before doing so. At the next point you |
| 250 | * give the DMA address back to the card, you must first perform a |
| 251 | * dma_sync_single_for_device, and then the device again owns the |
| 252 | * buffer. |
| 253 | */ |
| 254 | static inline void |
| 255 | dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| 256 | size_t size, enum dma_data_direction direction) |
| 257 | { |
| 258 | dma_cache_sync(bus_to_virt(dma_handle), size, direction); |
| 259 | } |
| 260 | |
| 261 | static inline void |
| 262 | dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, |
| 263 | size_t size, enum dma_data_direction direction) |
| 264 | { |
| 265 | dma_cache_sync(bus_to_virt(dma_handle), size, direction); |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * dma_sync_sg_for_cpu |
| 270 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 271 | * @sg: list of buffers |
| 272 | * @nents: number of buffers to map |
| 273 | * @dir: DMA transfer direction |
| 274 | * |
| 275 | * Make physical memory consistent for a set of streaming |
| 276 | * mode DMA translations after a transfer. |
| 277 | * |
| 278 | * The same as dma_sync_single_for_* but for a scatter-gather list, |
| 279 | * same rules and usage. |
| 280 | */ |
| 281 | static inline void |
| 282 | dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
| 283 | int nents, enum dma_data_direction direction) |
| 284 | { |
| 285 | int i; |
| 286 | |
| 287 | for (i = 0; i < nents; i++) { |
| 288 | dma_cache_sync(page_address(sg[i].page) + sg[i].offset, |
| 289 | sg[i].length, direction); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | static inline void |
| 294 | dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
| 295 | int nents, enum dma_data_direction direction) |
| 296 | { |
| 297 | int i; |
| 298 | |
| 299 | for (i = 0; i < nents; i++) { |
| 300 | dma_cache_sync(page_address(sg[i].page) + sg[i].offset, |
| 301 | sg[i].length, direction); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /* Now for the API extensions over the pci_ one */ |
| 306 | |
| 307 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) |
| 308 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) |
| 309 | |
| 310 | static inline int dma_is_consistent(dma_addr_t dma_addr) |
| 311 | { |
| 312 | return 1; |
| 313 | } |
| 314 | |
| 315 | static inline int dma_get_cache_alignment(void) |
| 316 | { |
| 317 | return boot_cpu_data.dcache.linesz; |
| 318 | } |
| 319 | |
| 320 | #endif /* __ASM_AVR32_DMA_MAPPING_H */ |