arch/mips/mm/dma-default.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, 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_page(dev, sg->page) +
 172                                   sg->offset;
 173         }
 174
 175         return nents;
 176 }
 177
 178 EXPORT_SYMBOL(dma_map_sg);
 179
 180 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 181         unsigned long offset, size_t size, enum dma_data_direction direction)
 182 {
 183         BUG_ON(direction == DMA_NONE);
 184
 185         if (!plat_device_is_coherent(dev)) {
 186                 unsigned long addr;
 187
 188                 addr = (unsigned long) page_address(page) + offset;
 189                 dma_cache_wback_inv(addr, size);
 190         }
 191
 192         return plat_map_dma_mem_page(dev, page) + offset;
 193 }
 194
 195 EXPORT_SYMBOL(dma_map_page);
 196
 197 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 198         enum dma_data_direction direction)
 199 {
 200         BUG_ON(direction == DMA_NONE);
 201
 202         if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
 203                 unsigned long addr;
 204
 205                 addr = plat_dma_addr_to_phys(dma_address);
 206                 dma_cache_wback_inv(addr, size);
 207         }
 208
 209         plat_unmap_dma_mem(dma_address);
 210 }
 211
 212 EXPORT_SYMBOL(dma_unmap_page);
 213
 214 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 215         enum dma_data_direction direction)
 216 {
 217         unsigned long addr;
 218         int i;
 219
 220         BUG_ON(direction == DMA_NONE);
 221
 222         for (i = 0; i < nhwentries; i++, sg++) {
 223                 if (!plat_device_is_coherent(dev) &&
 224                     direction != DMA_TO_DEVICE) {
 225                         addr = (unsigned long) page_address(sg->page);
 226                         if (addr)
 227                                 __dma_sync(addr + sg->offset, sg->length,
 228                                            direction);
 229                 }
 230                 plat_unmap_dma_mem(sg->dma_address);
 231         }
 232 }
 233
 234 EXPORT_SYMBOL(dma_unmap_sg);
 235
 236 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 237         size_t size, enum dma_data_direction direction)
 238 {
 239         BUG_ON(direction == DMA_NONE);
 240
 241         if (cpu_is_noncoherent_r10000(dev)) {
 242                 unsigned long addr;
 243
 244                 addr = dma_addr_to_virt(dma_handle);
 245                 __dma_sync(addr, size, direction);
 246         }
 247 }
 248
 249 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 250
 251 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 252         size_t size, enum dma_data_direction direction)
 253 {
 254         BUG_ON(direction == DMA_NONE);
 255
 256         if (!plat_device_is_coherent(dev)) {
 257                 unsigned long addr;
 258
 259                 addr = dma_addr_to_virt(dma_handle);
 260                 __dma_sync(addr, size, direction);
 261         }
 262 }
 263
 264 EXPORT_SYMBOL(dma_sync_single_for_device);
 265
 266 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 267         unsigned long offset, size_t size, enum dma_data_direction direction)
 268 {
 269         BUG_ON(direction == DMA_NONE);
 270
 271         if (cpu_is_noncoherent_r10000(dev)) {
 272                 unsigned long addr;
 273
 274                 addr = dma_addr_to_virt(dma_handle);
 275                 __dma_sync(addr + offset, size, direction);
 276         }
 277 }
 278
 279 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 280
 281 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 282         unsigned long offset, size_t size, enum dma_data_direction direction)
 283 {
 284         BUG_ON(direction == DMA_NONE);
 285
 286         if (!plat_device_is_coherent(dev)) {
 287                 unsigned long addr;
 288
 289                 addr = dma_addr_to_virt(dma_handle);
 290                 __dma_sync(addr + offset, size, direction);
 291         }
 292 }
 293
 294 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 295
 296 void dma_sync_sg_for_cpu(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                 if (cpu_is_noncoherent_r10000(dev))
 306                         __dma_sync((unsigned long)page_address(sg->page),
 307                                    sg->length, direction);
 308                 plat_unmap_dma_mem(sg->dma_address);
 309         }
 310 }
 311
 312 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 313
 314 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 315         enum dma_data_direction direction)
 316 {
 317         int i;
 318
 319         BUG_ON(direction == DMA_NONE);
 320
 321         /* Make sure that gcc doesn't leave the empty loop body.  */
 322         for (i = 0; i < nelems; i++, sg++) {
 323                 if (!plat_device_is_coherent(dev))
 324                         __dma_sync((unsigned long)page_address(sg->page),
 325                                    sg->length, direction);
 326                 plat_unmap_dma_mem(sg->dma_address);
 327         }
 328 }
 329
 330 EXPORT_SYMBOL(dma_sync_sg_for_device);
 331
 332 int dma_mapping_error(dma_addr_t dma_addr)
 333 {
 334         return 0;
 335 }
 336
 337 EXPORT_SYMBOL(dma_mapping_error);
 338
 339 int dma_supported(struct device *dev, u64 mask)
 340 {
 341         /*
 342          * we fall back to GFP_DMA when the mask isn't all 1s,
 343          * so we can't guarantee allocations that must be
 344          * within a tighter range than GFP_DMA..
 345          */
 346         if (mask < 0x00ffffff)
 347                 return 0;
 348
 349         return 1;
 350 }
 351
 352 EXPORT_SYMBOL(dma_supported);
 353
 354 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 355 {
 356         return plat_device_is_coherent(dev);
 357 }
 358
 359 EXPORT_SYMBOL(dma_is_consistent);
 360
 361 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 362                enum dma_data_direction direction)
 363 {
 364         BUG_ON(direction == DMA_NONE);
 365
 366         if (!plat_device_is_coherent(dev))
 367                 dma_cache_wback_inv((unsigned long)vaddr, size);
 368 }
 369
 370 EXPORT_SYMBOL(dma_cache_sync);