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/config.h>
  11 #include <linux/types.h>
  12 #include <linux/mm.h>
  13 #include <linux/module.h>
  14 #include <linux/string.h>
  15 #include <linux/dma-mapping.h>
  16
  17 #include <asm/cache.h>
  18 #include <asm/io.h>
  19
  20 /*
  21  * Warning on the terminology - Linux calls an uncached area coherent;
  22  * MIPS terminology calls memory areas with hardware maintained coherency
  23  * coherent.
  24  */
  25
  26 void *dma_alloc_noncoherent(struct device *dev, size_t size,
  27         dma_addr_t * dma_handle, gfp_t gfp)
  28 {
  29         void *ret;
  30         /* ignore region specifiers */
  31         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
  32
  33         if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
  34                 gfp |= GFP_DMA;
  35         ret = (void *) __get_free_pages(gfp, get_order(size));
  36
  37         if (ret != NULL) {
  38                 memset(ret, 0, size);
  39                 *dma_handle = virt_to_phys(ret);
  40         }
  41
  42         return ret;
  43 }
  44
  45 EXPORT_SYMBOL(dma_alloc_noncoherent);
  46
  47 void *dma_alloc_coherent(struct device *dev, size_t size,
  48         dma_addr_t * dma_handle, gfp_t gfp)
  49 {
  50         void *ret;
  51
  52         ret = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
  53         if (ret) {
  54                 dma_cache_wback_inv((unsigned long) ret, size);
  55                 ret = UNCAC_ADDR(ret);
  56         }
  57
  58         return ret;
  59 }
  60
  61 EXPORT_SYMBOL(dma_alloc_coherent);
  62
  63 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
  64         dma_addr_t dma_handle)
  65 {
  66         free_pages((unsigned long) vaddr, get_order(size));
  67 }
  68
  69 EXPORT_SYMBOL(dma_free_noncoherent);
  70
  71 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  72         dma_addr_t dma_handle)
  73 {
  74         unsigned long addr = (unsigned long) vaddr;
  75
  76         addr = CAC_ADDR(addr);
  77         free_pages(addr, get_order(size));
  78 }
  79
  80 EXPORT_SYMBOL(dma_free_coherent);
  81
  82 static inline void __dma_sync(unsigned long addr, size_t size,
  83         enum dma_data_direction direction)
  84 {
  85         switch (direction) {
  86         case DMA_TO_DEVICE:
  87                 dma_cache_wback(addr, size);
  88                 break;
  89
  90         case DMA_FROM_DEVICE:
  91                 dma_cache_inv(addr, size);
  92                 break;
  93
  94         case DMA_BIDIRECTIONAL:
  95                 dma_cache_wback_inv(addr, size);
  96                 break;
  97
  98         default:
  99                 BUG();
 100         }
 101 }
 102
 103 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 104         enum dma_data_direction direction)
 105 {
 106         unsigned long addr = (unsigned long) ptr;
 107
 108         switch (direction) {
 109         case DMA_TO_DEVICE:
 110                 dma_cache_wback(addr, size);
 111                 break;
 112
 113         case DMA_FROM_DEVICE:
 114                 dma_cache_inv(addr, size);
 115                 break;
 116
 117         case DMA_BIDIRECTIONAL:
 118                 dma_cache_wback_inv(addr, size);
 119                 break;
 120
 121         default:
 122                 BUG();
 123         }
 124
 125         return virt_to_phys(ptr);
 126 }
 127
 128 EXPORT_SYMBOL(dma_map_single);
 129
 130 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 131         enum dma_data_direction direction)
 132 {
 133         unsigned long addr;
 134         addr = dma_addr + PAGE_OFFSET;
 135
 136         switch (direction) {
 137         case DMA_TO_DEVICE:
 138                 //dma_cache_wback(addr, size);
 139                 break;
 140
 141         case DMA_FROM_DEVICE:
 142                 //dma_cache_inv(addr, size);
 143                 break;
 144
 145         case DMA_BIDIRECTIONAL:
 146                 //dma_cache_wback_inv(addr, size);
 147                 break;
 148
 149         default:
 150                 BUG();
 151         }
 152 }
 153
 154 EXPORT_SYMBOL(dma_unmap_single);
 155
 156 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 157         enum dma_data_direction direction)
 158 {
 159         int i;
 160
 161         BUG_ON(direction == DMA_NONE);
 162
 163         for (i = 0; i < nents; i++, sg++) {
 164                 unsigned long addr;
 165
 166                 addr = (unsigned long) page_address(sg->page);
 167                 if (addr)
 168                         __dma_sync(addr + sg->offset, sg->length, direction);
 169                 sg->dma_address = (dma_addr_t)
 170                         (page_to_phys(sg->page) + sg->offset);
 171         }
 172
 173         return nents;
 174 }
 175
 176 EXPORT_SYMBOL(dma_map_sg);
 177
 178 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 179         unsigned long offset, size_t size, enum dma_data_direction direction)
 180 {
 181         unsigned long addr;
 182
 183         BUG_ON(direction == DMA_NONE);
 184
 185         addr = (unsigned long) page_address(page) + offset;
 186         dma_cache_wback_inv(addr, size);
 187
 188         return page_to_phys(page) + offset;
 189 }
 190
 191 EXPORT_SYMBOL(dma_map_page);
 192
 193 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 194         enum dma_data_direction direction)
 195 {
 196         BUG_ON(direction == DMA_NONE);
 197
 198         if (direction != DMA_TO_DEVICE) {
 199                 unsigned long addr;
 200
 201                 addr = dma_address + PAGE_OFFSET;
 202                 dma_cache_wback_inv(addr, size);
 203         }
 204 }
 205
 206 EXPORT_SYMBOL(dma_unmap_page);
 207
 208 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 209         enum dma_data_direction direction)
 210 {
 211         unsigned long addr;
 212         int i;
 213
 214         BUG_ON(direction == DMA_NONE);
 215
 216         if (direction == DMA_TO_DEVICE)
 217                 return;
 218
 219         for (i = 0; i < nhwentries; i++, sg++) {
 220                 addr = (unsigned long) page_address(sg->page);
 221                 if (!addr)
 222                         continue;
 223                 dma_cache_wback_inv(addr + sg->offset, sg->length);
 224         }
 225 }
 226
 227 EXPORT_SYMBOL(dma_unmap_sg);
 228
 229 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 230         size_t size, enum dma_data_direction direction)
 231 {
 232         unsigned long addr;
 233
 234         BUG_ON(direction == DMA_NONE);
 235
 236         addr = dma_handle + PAGE_OFFSET;
 237         __dma_sync(addr, size, direction);
 238 }
 239
 240 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 241
 242 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 243         size_t size, enum dma_data_direction direction)
 244 {
 245         unsigned long addr;
 246
 247         BUG_ON(direction == DMA_NONE);
 248
 249         addr = dma_handle + PAGE_OFFSET;
 250         __dma_sync(addr, size, direction);
 251 }
 252
 253 EXPORT_SYMBOL(dma_sync_single_for_device);
 254
 255 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 256         unsigned long offset, size_t size, enum dma_data_direction direction)
 257 {
 258         unsigned long addr;
 259
 260         BUG_ON(direction == DMA_NONE);
 261
 262         addr = dma_handle + offset + PAGE_OFFSET;
 263         __dma_sync(addr, size, direction);
 264 }
 265
 266 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 267
 268 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 269         unsigned long offset, size_t size, enum dma_data_direction direction)
 270 {
 271         unsigned long addr;
 272
 273         BUG_ON(direction == DMA_NONE);
 274
 275         addr = dma_handle + offset + PAGE_OFFSET;
 276         __dma_sync(addr, size, direction);
 277 }
 278
 279 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 280
 281 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 282         enum dma_data_direction direction)
 283 {
 284         int i;
 285
 286         BUG_ON(direction == DMA_NONE);
 287
 288         /* Make sure that gcc doesn't leave the empty loop body.  */
 289         for (i = 0; i < nelems; i++, sg++)
 290                 __dma_sync((unsigned long)page_address(sg->page),
 291                            sg->length, direction);
 292 }
 293
 294 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 295
 296 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 297         enum dma_data_direction direction)
 298 {
 299         int i;
 300
 301         BUG_ON(direction == DMA_NONE);
 302
 303         /* Make sure that gcc doesn't leave the empty loop body.  */
 304         for (i = 0; i < nelems; i++, sg++)
 305                 __dma_sync((unsigned long)page_address(sg->page),
 306                            sg->length, direction);
 307 }
 308
 309 EXPORT_SYMBOL(dma_sync_sg_for_device);
 310
 311 int dma_mapping_error(dma_addr_t dma_addr)
 312 {
 313         return 0;
 314 }
 315
 316 EXPORT_SYMBOL(dma_mapping_error);
 317
 318 int dma_supported(struct device *dev, u64 mask)
 319 {
 320         /*
 321          * we fall back to GFP_DMA when the mask isn't all 1s,
 322          * so we can't guarantee allocations that must be
 323          * within a tighter range than GFP_DMA..
 324          */
 325         if (mask < 0x00ffffff)
 326                 return 0;
 327
 328         return 1;
 329 }
 330
 331 EXPORT_SYMBOL(dma_supported);
 332
 333 int dma_is_consistent(dma_addr_t dma_addr)
 334 {
 335         return 1;
 336 }
 337
 338 EXPORT_SYMBOL(dma_is_consistent);
 339
 340 void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction direction)
 341 {
 342         if (direction == DMA_NONE)
 343                 return;
 344
 345         dma_cache_wback_inv((unsigned long)vaddr, size);
 346 }
 347
 348 EXPORT_SYMBOL(dma_cache_sync);
 349
 350 /* The DAC routines are a PCIism.. */
 351
 352 #ifdef CONFIG_PCI
 353
 354 #include <linux/pci.h>
 355
 356 dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
 357         struct page *page, unsigned long offset, int direction)
 358 {
 359         return (dma64_addr_t)page_to_phys(page) + offset;
 360 }
 361
 362 EXPORT_SYMBOL(pci_dac_page_to_dma);
 363
 364 struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
 365         dma64_addr_t dma_addr)
 366 {
 367         return mem_map + (dma_addr >> PAGE_SHIFT);
 368 }
 369
 370 EXPORT_SYMBOL(pci_dac_dma_to_page);
 371
 372 unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
 373         dma64_addr_t dma_addr)
 374 {
 375         return dma_addr & ~PAGE_MASK;
 376 }
 377
 378 EXPORT_SYMBOL(pci_dac_dma_to_offset);
 379
 380 void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
 381         dma64_addr_t dma_addr, size_t len, int direction)
 382 {
 383         BUG_ON(direction == PCI_DMA_NONE);
 384
 385         dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
 386 }
 387
 388 EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu);
 389
 390 void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
 391         dma64_addr_t dma_addr, size_t len, int direction)
 392 {
 393         BUG_ON(direction == PCI_DMA_NONE);
 394
 395         dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
 396 }
 397
 398 EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);
 399
 400 #endif /* CONFIG_PCI */