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   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, 06  Ralf Baechle <ralf@linux-mips.org>
   8  * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/mm.h>
  14 #include <linux/module.h>
  15 #include <linux/string.h>
  16
  17 #include <asm/cache.h>
  18 #include <asm/io.h>
  19
  20 #include <dma-coherence.h>
  21
  22 static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
  23 {
  24         unsigned long addr = plat_dma_addr_to_phys(dma_addr);
  25
  26         return (unsigned long)phys_to_virt(addr);
  27 }
  28
  29 /*
  30  * Warning on the terminology - Linux calls an uncached area coherent;
  31  * MIPS terminology calls memory areas with hardware maintained coherency
  32  * coherent.
  33  */
  34
  35 static inline int cpu_is_noncoherent_r10000(struct device *dev)
  36 {
  37         return !plat_device_is_coherent(dev) &&
  38                (current_cpu_data.cputype == CPU_R10000 &&
  39                current_cpu_data.cputype == CPU_R12000);
  40 }
  41
  42 void *dma_alloc_noncoherent(struct device *dev, size_t size,
  43         dma_addr_t * dma_handle, gfp_t gfp)
  44 {
  45         void *ret;
  46
  47         /* ignore region specifiers */
  48         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
  49
  50         if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
  51                 gfp |= GFP_DMA;
  52         ret = (void *) __get_free_pages(gfp, get_order(size));
  53
  54         if (ret != NULL) {
  55                 memset(ret, 0, size);
  56                 *dma_handle = plat_map_dma_mem(dev, ret, size);
  57         }
  58
  59         return ret;
  60 }
  61
  62 EXPORT_SYMBOL(dma_alloc_noncoherent);
  63
  64 void *dma_alloc_coherent(struct device *dev, size_t size,
  65         dma_addr_t * dma_handle, gfp_t gfp)
  66 {
  67         void *ret;
  68
  69         /* ignore region specifiers */
  70         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
  71
  72         if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
  73                 gfp |= GFP_DMA;
  74         ret = (void *) __get_free_pages(gfp, get_order(size));
  75
  76         if (ret) {
  77                 memset(ret, 0, size);
  78                 *dma_handle = plat_map_dma_mem(dev, ret, size);
  79
  80                 if (!plat_device_is_coherent(dev)) {
  81                         dma_cache_wback_inv((unsigned long) ret, size);
  82                         ret = UNCAC_ADDR(ret);
  83                 }
  84         }
  85
  86         return ret;
  87 }
  88
  89 EXPORT_SYMBOL(dma_alloc_coherent);
  90
  91 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
  92         dma_addr_t dma_handle)
  93 {
  94         free_pages((unsigned long) vaddr, get_order(size));
  95 }
  96
  97 EXPORT_SYMBOL(dma_free_noncoherent);
  98
  99 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 100         dma_addr_t dma_handle)
 101 {
 102         unsigned long addr = (unsigned long) vaddr;
 103
 104         if (!plat_device_is_coherent(dev))
 105                 addr = CAC_ADDR(addr);
 106
 107         free_pages(addr, get_order(size));
 108 }
 109
 110 EXPORT_SYMBOL(dma_free_coherent);
 111
 112 static inline void __dma_sync(unsigned long addr, size_t size,
 113         enum dma_data_direction direction)
 114 {
 115         switch (direction) {
 116         case DMA_TO_DEVICE:
 117                 dma_cache_wback(addr, size);
 118                 break;
 119
 120         case DMA_FROM_DEVICE:
 121                 dma_cache_inv(addr, size);
 122                 break;
 123
 124         case DMA_BIDIRECTIONAL:
 125                 dma_cache_wback_inv(addr, size);
 126                 break;
 127
 128         default:
 129                 BUG();
 130         }
 131 }
 132
 133 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 134         enum dma_data_direction direction)
 135 {
 136         unsigned long addr = (unsigned long) ptr;
 137
 138         if (!plat_device_is_coherent(dev))
 139                 __dma_sync(addr, size, direction);
 140
 141         return plat_map_dma_mem(dev, ptr, size);
 142 }
 143
 144 EXPORT_SYMBOL(dma_map_single);
 145
 146 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 147         enum dma_data_direction direction)
 148 {
 149         if (cpu_is_noncoherent_r10000(dev))
 150                 __dma_sync(dma_addr_to_virt(dma_addr), size,
 151                            direction);
 152
 153         plat_unmap_dma_mem(dma_addr);
 154 }
 155
 156 EXPORT_SYMBOL(dma_unmap_single);
 157
 158 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 159         enum dma_data_direction direction)
 160 {
 161         int i;
 162
 163         BUG_ON(direction == DMA_NONE);
 164
 165         for (i = 0; i < nents; i++, sg++) {
 166                 unsigned long addr;
 167
 168                 addr = (unsigned long) page_address(sg->page);
 169                 if (!plat_device_is_coherent(dev) && addr)
 170                         __dma_sync(addr + sg->offset, sg->length, direction);
 171                 sg->dma_address = plat_map_dma_mem(dev,
 172                                                    (void *)(addr + sg->offset),
 173                                                    sg->length);
 174         }
 175
 176         return nents;
 177 }
 178
 179 EXPORT_SYMBOL(dma_map_sg);
 180
 181 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 182         unsigned long offset, size_t size, enum dma_data_direction direction)
 183 {
 184         BUG_ON(direction == DMA_NONE);
 185
 186         if (!plat_device_is_coherent(dev)) {
 187                 unsigned long addr;
 188
 189                 addr = (unsigned long) page_address(page) + offset;
 190                 dma_cache_wback_inv(addr, size);
 191         }
 192
 193         return plat_map_dma_mem_page(dev, page) + offset;
 194 }
 195
 196 EXPORT_SYMBOL(dma_map_page);
 197
 198 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 199         enum dma_data_direction direction)
 200 {
 201         BUG_ON(direction == DMA_NONE);
 202
 203         if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
 204                 unsigned long addr;
 205
 206                 addr = plat_dma_addr_to_phys(dma_address);
 207                 dma_cache_wback_inv(addr, size);
 208         }
 209
 210         plat_unmap_dma_mem(dma_address);
 211 }
 212
 213 EXPORT_SYMBOL(dma_unmap_page);
 214
 215 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 216         enum dma_data_direction direction)
 217 {
 218         unsigned long addr;
 219         int i;
 220
 221         BUG_ON(direction == DMA_NONE);
 222
 223         for (i = 0; i < nhwentries; i++, sg++) {
 224                 if (!plat_device_is_coherent(dev) &&
 225                     direction != DMA_TO_DEVICE) {
 226                         addr = (unsigned long) page_address(sg->page);
 227                         if (addr)
 228                                 __dma_sync(addr + sg->offset, sg->length,
 229                                            direction);
 230                 }
 231                 plat_unmap_dma_mem(sg->dma_address);
 232         }
 233 }
 234
 235 EXPORT_SYMBOL(dma_unmap_sg);
 236
 237 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 238         size_t size, enum dma_data_direction direction)
 239 {
 240         BUG_ON(direction == DMA_NONE);
 241
 242         if (cpu_is_noncoherent_r10000(dev)) {
 243                 unsigned long addr;
 244
 245                 addr = dma_addr_to_virt(dma_handle);
 246                 __dma_sync(addr, size, direction);
 247         }
 248 }
 249
 250 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 251
 252 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 253         size_t size, enum dma_data_direction direction)
 254 {
 255         BUG_ON(direction == DMA_NONE);
 256
 257         if (!plat_device_is_coherent(dev)) {
 258                 unsigned long addr;
 259
 260                 addr = dma_addr_to_virt(dma_handle);
 261                 __dma_sync(addr, size, direction);
 262         }
 263 }
 264
 265 EXPORT_SYMBOL(dma_sync_single_for_device);
 266
 267 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 268         unsigned long offset, size_t size, enum dma_data_direction direction)
 269 {
 270         BUG_ON(direction == DMA_NONE);
 271
 272         if (cpu_is_noncoherent_r10000(dev)) {
 273                 unsigned long addr;
 274
 275                 addr = dma_addr_to_virt(dma_handle);
 276                 __dma_sync(addr + offset, size, direction);
 277         }
 278 }
 279
 280 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 281
 282 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 283         unsigned long offset, size_t size, enum dma_data_direction direction)
 284 {
 285         BUG_ON(direction == DMA_NONE);
 286
 287         if (!plat_device_is_coherent(dev)) {
 288                 unsigned long addr;
 289
 290                 addr = dma_addr_to_virt(dma_handle);
 291                 __dma_sync(addr + offset, size, direction);
 292         }
 293 }
 294
 295 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 296
 297 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 298         enum dma_data_direction direction)
 299 {
 300         int i;
 301
 302         BUG_ON(direction == DMA_NONE);
 303
 304         /* Make sure that gcc doesn't leave the empty loop body.  */
 305         for (i = 0; i < nelems; i++, sg++) {
 306                 if (cpu_is_noncoherent_r10000(dev))
 307                         __dma_sync((unsigned long)page_address(sg->page),
 308                                    sg->length, direction);
 309                 plat_unmap_dma_mem(sg->dma_address);
 310         }
 311 }
 312
 313 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 314
 315 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 316         enum dma_data_direction direction)
 317 {
 318         int i;
 319
 320         BUG_ON(direction == DMA_NONE);
 321
 322         /* Make sure that gcc doesn't leave the empty loop body.  */
 323         for (i = 0; i < nelems; i++, sg++) {
 324                 if (!plat_device_is_coherent(dev))
 325                         __dma_sync((unsigned long)page_address(sg->page),
 326                                    sg->length, direction);
 327                 plat_unmap_dma_mem(sg->dma_address);
 328         }
 329 }
 330
 331 EXPORT_SYMBOL(dma_sync_sg_for_device);
 332
 333 int dma_mapping_error(dma_addr_t dma_addr)
 334 {
 335         return 0;
 336 }
 337
 338 EXPORT_SYMBOL(dma_mapping_error);
 339
 340 int dma_supported(struct device *dev, u64 mask)
 341 {
 342         /*
 343          * we fall back to GFP_DMA when the mask isn't all 1s,
 344          * so we can't guarantee allocations that must be
 345          * within a tighter range than GFP_DMA..
 346          */
 347         if (mask < 0x00ffffff)
 348                 return 0;
 349
 350         return 1;
 351 }
 352
 353 EXPORT_SYMBOL(dma_supported);
 354
 355 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 356 {
 357         return plat_device_is_coherent(dev);
 358 }
 359
 360 EXPORT_SYMBOL(dma_is_consistent);
 361
 362 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 363                enum dma_data_direction direction)
 364 {
 365         BUG_ON(direction == DMA_NONE);
 366
 367         if (!plat_device_is_coherent(dev))
 368                 dma_cache_wback_inv((unsigned long)vaddr, size);
 369 }
 370
 371 EXPORT_SYMBOL(dma_cache_sync);