arch/mips/mm/dma-noncoherent.c

   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  */
  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,
  26         dma_addr_t * dma_handle, gfp_t gfp)
  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,
  47         dma_addr_t * dma_handle, gfp_t gfp)
  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
 107         __dma_sync(addr, size, direction);
 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
 120         //__dma_sync(addr, size, direction);
 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;
 134
 135                 addr = (unsigned long) page_address(sg->page);
 136                 if (addr) {
 137                         __dma_sync(addr + sg->offset, sg->length, direction);
 138                         sg->dma_address = (dma_addr_t)page_to_phys(sg->page)
 139                                           + sg->offset;
 140                 }
 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);
 191                 if (addr)
 192                         __dma_sync(addr + sg->offset, sg->length, direction);
 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;
 202
 203         BUG_ON(direction == DMA_NONE);
 204
 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;
 254
 255         BUG_ON(direction == DMA_NONE);
 256
 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
 302 int dma_is_consistent(dma_addr_t dma_addr)
 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 */