Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com> |
| 7 | * Copyright (C) 2000, 2001 Ralf Baechle <ralf@gnu.org> |
| 8 | * swiped from i386, and cloned for MIPS by Geert, polished by Ralf. |
| 9 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/types.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/dma-mapping.h> |
| 15 | |
| 16 | #include <asm/cache.h> |
| 17 | #include <asm/io.h> |
| 18 | |
| 19 | /* |
| 20 | * Warning on the terminology - Linux calls an uncached area coherent; |
| 21 | * MIPS terminology calls memory areas with hardware maintained coherency |
| 22 | * coherent. |
| 23 | */ |
| 24 | |
| 25 | void *dma_alloc_noncoherent(struct device *dev, size_t size, |
Al Viro | 185a8ff | 2005-10-21 03:21:23 -0400 | [diff] [blame] | 26 | dma_addr_t * dma_handle, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | { |
| 28 | void *ret; |
| 29 | /* ignore region specifiers */ |
| 30 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); |
| 31 | |
| 32 | if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff)) |
| 33 | gfp |= GFP_DMA; |
| 34 | ret = (void *) __get_free_pages(gfp, get_order(size)); |
| 35 | |
| 36 | if (ret != NULL) { |
| 37 | memset(ret, 0, size); |
| 38 | *dma_handle = virt_to_phys(ret); |
| 39 | } |
| 40 | |
| 41 | return ret; |
| 42 | } |
| 43 | |
| 44 | EXPORT_SYMBOL(dma_alloc_noncoherent); |
| 45 | |
| 46 | void *dma_alloc_coherent(struct device *dev, size_t size, |
Al Viro | 185a8ff | 2005-10-21 03:21:23 -0400 | [diff] [blame] | 47 | dma_addr_t * dma_handle, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | { |
| 49 | void *ret; |
| 50 | |
| 51 | ret = dma_alloc_noncoherent(dev, size, dma_handle, gfp); |
| 52 | if (ret) { |
| 53 | dma_cache_wback_inv((unsigned long) ret, size); |
| 54 | ret = UNCAC_ADDR(ret); |
| 55 | } |
| 56 | |
| 57 | return ret; |
| 58 | } |
| 59 | |
| 60 | EXPORT_SYMBOL(dma_alloc_coherent); |
| 61 | |
| 62 | void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, |
| 63 | dma_addr_t dma_handle) |
| 64 | { |
| 65 | free_pages((unsigned long) vaddr, get_order(size)); |
| 66 | } |
| 67 | |
| 68 | EXPORT_SYMBOL(dma_free_noncoherent); |
| 69 | |
| 70 | void dma_free_coherent(struct device *dev, size_t size, void *vaddr, |
| 71 | dma_addr_t dma_handle) |
| 72 | { |
| 73 | unsigned long addr = (unsigned long) vaddr; |
| 74 | |
| 75 | addr = CAC_ADDR(addr); |
| 76 | free_pages(addr, get_order(size)); |
| 77 | } |
| 78 | |
| 79 | EXPORT_SYMBOL(dma_free_coherent); |
| 80 | |
| 81 | static inline void __dma_sync(unsigned long addr, size_t size, |
| 82 | enum dma_data_direction direction) |
| 83 | { |
| 84 | switch (direction) { |
| 85 | case DMA_TO_DEVICE: |
| 86 | dma_cache_wback(addr, size); |
| 87 | break; |
| 88 | |
| 89 | case DMA_FROM_DEVICE: |
| 90 | dma_cache_inv(addr, size); |
| 91 | break; |
| 92 | |
| 93 | case DMA_BIDIRECTIONAL: |
| 94 | dma_cache_wback_inv(addr, size); |
| 95 | break; |
| 96 | |
| 97 | default: |
| 98 | BUG(); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, |
| 103 | enum dma_data_direction direction) |
| 104 | { |
| 105 | unsigned long addr = (unsigned long) ptr; |
| 106 | |
Thiemo Seufer | 424cada | 2005-09-09 17:09:18 +0000 | [diff] [blame] | 107 | __dma_sync(addr, size, direction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | return virt_to_phys(ptr); |
| 110 | } |
| 111 | |
| 112 | EXPORT_SYMBOL(dma_map_single); |
| 113 | |
| 114 | void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, |
| 115 | enum dma_data_direction direction) |
| 116 | { |
| 117 | unsigned long addr; |
| 118 | addr = dma_addr + PAGE_OFFSET; |
| 119 | |
Thiemo Seufer | 424cada | 2005-09-09 17:09:18 +0000 | [diff] [blame] | 120 | //__dma_sync(addr, size, direction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | EXPORT_SYMBOL(dma_unmap_single); |
| 124 | |
| 125 | int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 126 | enum dma_data_direction direction) |
| 127 | { |
| 128 | int i; |
| 129 | |
| 130 | BUG_ON(direction == DMA_NONE); |
| 131 | |
| 132 | for (i = 0; i < nents; i++, sg++) { |
| 133 | unsigned long addr; |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | addr = (unsigned long) page_address(sg->page); |
Thiemo Seufer | 424cada | 2005-09-09 17:09:18 +0000 | [diff] [blame] | 136 | if (addr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | __dma_sync(addr + sg->offset, sg->length, direction); |
Thiemo Seufer | 424cada | 2005-09-09 17:09:18 +0000 | [diff] [blame] | 138 | sg->dma_address = (dma_addr_t)page_to_phys(sg->page) |
| 139 | + sg->offset; |
| 140 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | return nents; |
| 144 | } |
| 145 | |
| 146 | EXPORT_SYMBOL(dma_map_sg); |
| 147 | |
| 148 | dma_addr_t dma_map_page(struct device *dev, struct page *page, |
| 149 | unsigned long offset, size_t size, enum dma_data_direction direction) |
| 150 | { |
| 151 | unsigned long addr; |
| 152 | |
| 153 | BUG_ON(direction == DMA_NONE); |
| 154 | |
| 155 | addr = (unsigned long) page_address(page) + offset; |
| 156 | dma_cache_wback_inv(addr, size); |
| 157 | |
| 158 | return page_to_phys(page) + offset; |
| 159 | } |
| 160 | |
| 161 | EXPORT_SYMBOL(dma_map_page); |
| 162 | |
| 163 | void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, |
| 164 | enum dma_data_direction direction) |
| 165 | { |
| 166 | BUG_ON(direction == DMA_NONE); |
| 167 | |
| 168 | if (direction != DMA_TO_DEVICE) { |
| 169 | unsigned long addr; |
| 170 | |
| 171 | addr = dma_address + PAGE_OFFSET; |
| 172 | dma_cache_wback_inv(addr, size); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | EXPORT_SYMBOL(dma_unmap_page); |
| 177 | |
| 178 | void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, |
| 179 | enum dma_data_direction direction) |
| 180 | { |
| 181 | unsigned long addr; |
| 182 | int i; |
| 183 | |
| 184 | BUG_ON(direction == DMA_NONE); |
| 185 | |
| 186 | if (direction == DMA_TO_DEVICE) |
| 187 | return; |
| 188 | |
| 189 | for (i = 0; i < nhwentries; i++, sg++) { |
| 190 | addr = (unsigned long) page_address(sg->page); |
Thiemo Seufer | 424cada | 2005-09-09 17:09:18 +0000 | [diff] [blame] | 191 | if (addr) |
| 192 | __dma_sync(addr + sg->offset, sg->length, direction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | } |
| 195 | |
| 196 | EXPORT_SYMBOL(dma_unmap_sg); |
| 197 | |
| 198 | void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| 199 | size_t size, enum dma_data_direction direction) |
| 200 | { |
| 201 | unsigned long addr; |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | BUG_ON(direction == DMA_NONE); |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | addr = dma_handle + PAGE_OFFSET; |
| 206 | __dma_sync(addr, size, direction); |
| 207 | } |
| 208 | |
| 209 | EXPORT_SYMBOL(dma_sync_single_for_cpu); |
| 210 | |
| 211 | void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, |
| 212 | size_t size, enum dma_data_direction direction) |
| 213 | { |
| 214 | unsigned long addr; |
| 215 | |
| 216 | BUG_ON(direction == DMA_NONE); |
| 217 | |
| 218 | addr = dma_handle + PAGE_OFFSET; |
| 219 | __dma_sync(addr, size, direction); |
| 220 | } |
| 221 | |
| 222 | EXPORT_SYMBOL(dma_sync_single_for_device); |
| 223 | |
| 224 | void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| 225 | unsigned long offset, size_t size, enum dma_data_direction direction) |
| 226 | { |
| 227 | unsigned long addr; |
| 228 | |
| 229 | BUG_ON(direction == DMA_NONE); |
| 230 | |
| 231 | addr = dma_handle + offset + PAGE_OFFSET; |
| 232 | __dma_sync(addr, size, direction); |
| 233 | } |
| 234 | |
| 235 | EXPORT_SYMBOL(dma_sync_single_range_for_cpu); |
| 236 | |
| 237 | void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, |
| 238 | unsigned long offset, size_t size, enum dma_data_direction direction) |
| 239 | { |
| 240 | unsigned long addr; |
| 241 | |
| 242 | BUG_ON(direction == DMA_NONE); |
| 243 | |
| 244 | addr = dma_handle + offset + PAGE_OFFSET; |
| 245 | __dma_sync(addr, size, direction); |
| 246 | } |
| 247 | |
| 248 | EXPORT_SYMBOL(dma_sync_single_range_for_device); |
| 249 | |
| 250 | void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, |
| 251 | enum dma_data_direction direction) |
| 252 | { |
| 253 | int i; |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | BUG_ON(direction == DMA_NONE); |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | /* Make sure that gcc doesn't leave the empty loop body. */ |
| 258 | for (i = 0; i < nelems; i++, sg++) |
| 259 | __dma_sync((unsigned long)page_address(sg->page), |
| 260 | sg->length, direction); |
| 261 | } |
| 262 | |
| 263 | EXPORT_SYMBOL(dma_sync_sg_for_cpu); |
| 264 | |
| 265 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, |
| 266 | enum dma_data_direction direction) |
| 267 | { |
| 268 | int i; |
| 269 | |
| 270 | BUG_ON(direction == DMA_NONE); |
| 271 | |
| 272 | /* Make sure that gcc doesn't leave the empty loop body. */ |
| 273 | for (i = 0; i < nelems; i++, sg++) |
| 274 | __dma_sync((unsigned long)page_address(sg->page), |
| 275 | sg->length, direction); |
| 276 | } |
| 277 | |
| 278 | EXPORT_SYMBOL(dma_sync_sg_for_device); |
| 279 | |
| 280 | int dma_mapping_error(dma_addr_t dma_addr) |
| 281 | { |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | EXPORT_SYMBOL(dma_mapping_error); |
| 286 | |
| 287 | int dma_supported(struct device *dev, u64 mask) |
| 288 | { |
| 289 | /* |
| 290 | * we fall back to GFP_DMA when the mask isn't all 1s, |
| 291 | * so we can't guarantee allocations that must be |
| 292 | * within a tighter range than GFP_DMA.. |
| 293 | */ |
| 294 | if (mask < 0x00ffffff) |
| 295 | return 0; |
| 296 | |
| 297 | return 1; |
| 298 | } |
| 299 | |
| 300 | EXPORT_SYMBOL(dma_supported); |
| 301 | |
Ralf Baechle | f67637e | 2006-12-06 20:38:54 -0800 | [diff] [blame^] | 302 | int dma_is_consistent(struct device *dev, dma_addr_t dma_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | { |
| 304 | return 1; |
| 305 | } |
| 306 | |
| 307 | EXPORT_SYMBOL(dma_is_consistent); |
| 308 | |
| 309 | void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction direction) |
| 310 | { |
| 311 | if (direction == DMA_NONE) |
| 312 | return; |
| 313 | |
| 314 | dma_cache_wback_inv((unsigned long)vaddr, size); |
| 315 | } |
| 316 | |
| 317 | EXPORT_SYMBOL(dma_cache_sync); |
| 318 | |
| 319 | /* The DAC routines are a PCIism.. */ |
| 320 | |
| 321 | #ifdef CONFIG_PCI |
| 322 | |
| 323 | #include <linux/pci.h> |
| 324 | |
| 325 | dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev, |
| 326 | struct page *page, unsigned long offset, int direction) |
| 327 | { |
| 328 | return (dma64_addr_t)page_to_phys(page) + offset; |
| 329 | } |
| 330 | |
| 331 | EXPORT_SYMBOL(pci_dac_page_to_dma); |
| 332 | |
| 333 | struct page *pci_dac_dma_to_page(struct pci_dev *pdev, |
| 334 | dma64_addr_t dma_addr) |
| 335 | { |
| 336 | return mem_map + (dma_addr >> PAGE_SHIFT); |
| 337 | } |
| 338 | |
| 339 | EXPORT_SYMBOL(pci_dac_dma_to_page); |
| 340 | |
| 341 | unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev, |
| 342 | dma64_addr_t dma_addr) |
| 343 | { |
| 344 | return dma_addr & ~PAGE_MASK; |
| 345 | } |
| 346 | |
| 347 | EXPORT_SYMBOL(pci_dac_dma_to_offset); |
| 348 | |
| 349 | void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, |
| 350 | dma64_addr_t dma_addr, size_t len, int direction) |
| 351 | { |
| 352 | BUG_ON(direction == PCI_DMA_NONE); |
| 353 | |
| 354 | dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len); |
| 355 | } |
| 356 | |
| 357 | EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu); |
| 358 | |
| 359 | void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, |
| 360 | dma64_addr_t dma_addr, size_t len, int direction) |
| 361 | { |
| 362 | BUG_ON(direction == PCI_DMA_NONE); |
| 363 | |
| 364 | dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len); |
| 365 | } |
| 366 | |
| 367 | EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device); |
| 368 | |
| 369 | #endif /* CONFIG_PCI */ |