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