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/scatterlist.h>
  16 #include <linux/string.h>
  17 #include <linux/gfp.h>
  18
  19 #include <asm/cache.h>
  20 #include <asm/io.h>
  21
  22 #include <dma-coherence.h>
  23
  24 static inline unsigned long dma_addr_to_virt(struct device *dev,
  25         dma_addr_t dma_addr)
  26 {
  27         unsigned long addr = plat_dma_addr_to_phys(dev, dma_addr);
  28
  29         return (unsigned long)phys_to_virt(addr);
  30 }
  31
  32 /*
  33  * Warning on the terminology - Linux calls an uncached area coherent;
  34  * MIPS terminology calls memory areas with hardware maintained coherency
  35  * coherent.
  36  */
  37
  38 static inline int cpu_is_noncoherent_r10000(struct device *dev)
  39 {
  40         return !plat_device_is_coherent(dev) &&
  41                (current_cpu_type() == CPU_R10000 ||
  42                current_cpu_type() == CPU_R12000);
  43 }
  44
  45 static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
  46 {
  47         /* ignore region specifiers */
  48         gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  49
  50 #ifdef CONFIG_ZONE_DMA
  51         if (dev == NULL)
  52                 gfp |= __GFP_DMA;
  53         else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
  54                 gfp |= __GFP_DMA;
  55         else
  56 #endif
  57 #ifdef CONFIG_ZONE_DMA32
  58              if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
  59                 gfp |= __GFP_DMA32;
  60         else
  61 #endif
  62                 ;
  63
  64         /* Don't invoke OOM killer */
  65         gfp |= __GFP_NORETRY;
  66
  67         return gfp;
  68 }
  69
  70 void *dma_alloc_noncoherent(struct device *dev, size_t size,
  71         dma_addr_t * dma_handle, gfp_t gfp)
  72 {
  73         void *ret;
  74
  75         gfp = massage_gfp_flags(dev, gfp);
  76
  77         ret = (void *) __get_free_pages(gfp, get_order(size));
  78
  79         if (ret != NULL) {
  80                 memset(ret, 0, size);
  81                 *dma_handle = plat_map_dma_mem(dev, ret, size);
  82         }
  83
  84         return ret;
  85 }
  86
  87 EXPORT_SYMBOL(dma_alloc_noncoherent);
  88
  89 void *dma_alloc_coherent(struct device *dev, size_t size,
  90         dma_addr_t * dma_handle, gfp_t gfp)
  91 {
  92         void *ret;
  93
  94         if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
  95                 return ret;
  96
  97         gfp = massage_gfp_flags(dev, gfp);
  98
  99         ret = (void *) __get_free_pages(gfp, get_order(size));
 100
 101         if (ret) {
 102                 memset(ret, 0, size);
 103                 *dma_handle = plat_map_dma_mem(dev, ret, size);
 104
 105                 if (!plat_device_is_coherent(dev)) {
 106                         dma_cache_wback_inv((unsigned long) ret, size);
 107                         ret = UNCAC_ADDR(ret);
 108                 }
 109         }
 110
 111         return ret;
 112 }
 113
 114 EXPORT_SYMBOL(dma_alloc_coherent);
 115
 116 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 117         dma_addr_t dma_handle)
 118 {
 119         plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
 120         free_pages((unsigned long) vaddr, get_order(size));
 121 }
 122
 123 EXPORT_SYMBOL(dma_free_noncoherent);
 124
 125 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 126         dma_addr_t dma_handle)
 127 {
 128         unsigned long addr = (unsigned long) vaddr;
 129         int order = get_order(size);
 130
 131         if (dma_release_from_coherent(dev, order, vaddr))
 132                 return;
 133
 134         plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
 135
 136         if (!plat_device_is_coherent(dev))
 137                 addr = CAC_ADDR(addr);
 138
 139         free_pages(addr, get_order(size));
 140 }
 141
 142 EXPORT_SYMBOL(dma_free_coherent);
 143
 144 static inline void __dma_sync(unsigned long addr, size_t size,
 145         enum dma_data_direction direction)
 146 {
 147         switch (direction) {
 148         case DMA_TO_DEVICE:
 149                 dma_cache_wback(addr, size);
 150                 break;
 151
 152         case DMA_FROM_DEVICE:
 153                 dma_cache_inv(addr, size);
 154                 break;
 155
 156         case DMA_BIDIRECTIONAL:
 157                 dma_cache_wback_inv(addr, size);
 158                 break;
 159
 160         default:
 161                 BUG();
 162         }
 163 }
 164
 165 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 166         enum dma_data_direction direction)
 167 {
 168         unsigned long addr = (unsigned long) ptr;
 169
 170         if (!plat_device_is_coherent(dev))
 171                 __dma_sync(addr, size, direction);
 172
 173         return plat_map_dma_mem(dev, ptr, size);
 174 }
 175
 176 EXPORT_SYMBOL(dma_map_single);
 177
 178 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 179         enum dma_data_direction direction)
 180 {
 181         if (cpu_is_noncoherent_r10000(dev))
 182                 __dma_sync(dma_addr_to_virt(dev, dma_addr), size,
 183                            direction);
 184
 185         plat_unmap_dma_mem(dev, dma_addr, size, direction);
 186 }
 187
 188 EXPORT_SYMBOL(dma_unmap_single);
 189
 190 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 191         enum dma_data_direction direction)
 192 {
 193         int i;
 194
 195         BUG_ON(direction == DMA_NONE);
 196
 197         for (i = 0; i < nents; i++, sg++) {
 198                 unsigned long addr;
 199
 200                 addr = (unsigned long) sg_virt(sg);
 201                 if (!plat_device_is_coherent(dev) && addr)
 202                         __dma_sync(addr, sg->length, direction);
 203                 sg->dma_address = plat_map_dma_mem(dev,
 204                                                    (void *)addr, sg->length);
 205         }
 206
 207         return nents;
 208 }
 209
 210 EXPORT_SYMBOL(dma_map_sg);
 211
 212 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 213         unsigned long offset, size_t size, enum dma_data_direction direction)
 214 {
 215         BUG_ON(direction == DMA_NONE);
 216
 217         if (!plat_device_is_coherent(dev)) {
 218                 unsigned long addr;
 219
 220                 addr = (unsigned long) page_address(page) + offset;
 221                 __dma_sync(addr, size, direction);
 222         }
 223
 224         return plat_map_dma_mem_page(dev, page) + offset;
 225 }
 226
 227 EXPORT_SYMBOL(dma_map_page);
 228
 229 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 230         enum dma_data_direction direction)
 231 {
 232         unsigned long addr;
 233         int i;
 234
 235         BUG_ON(direction == DMA_NONE);
 236
 237         for (i = 0; i < nhwentries; i++, sg++) {
 238                 if (!plat_device_is_coherent(dev) &&
 239                     direction != DMA_TO_DEVICE) {
 240                         addr = (unsigned long) sg_virt(sg);
 241                         if (addr)
 242                                 __dma_sync(addr, sg->length, direction);
 243                 }
 244                 plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
 245         }
 246 }
 247
 248 EXPORT_SYMBOL(dma_unmap_sg);
 249
 250 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 251         size_t size, enum dma_data_direction direction)
 252 {
 253         BUG_ON(direction == DMA_NONE);
 254
 255         if (cpu_is_noncoherent_r10000(dev)) {
 256                 unsigned long addr;
 257
 258                 addr = dma_addr_to_virt(dev, dma_handle);
 259                 __dma_sync(addr, size, direction);
 260         }
 261 }
 262
 263 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 264
 265 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 266         size_t size, enum dma_data_direction direction)
 267 {
 268         BUG_ON(direction == DMA_NONE);
 269
 270         plat_extra_sync_for_device(dev);
 271         if (!plat_device_is_coherent(dev)) {
 272                 unsigned long addr;
 273
 274                 addr = dma_addr_to_virt(dev, dma_handle);
 275                 __dma_sync(addr, size, direction);
 276         }
 277 }
 278
 279 EXPORT_SYMBOL(dma_sync_single_for_device);
 280
 281 void dma_sync_single_range_for_cpu(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 (cpu_is_noncoherent_r10000(dev)) {
 287                 unsigned long addr;
 288
 289                 addr = dma_addr_to_virt(dev, dma_handle);
 290                 __dma_sync(addr + offset, size, direction);
 291         }
 292 }
 293
 294 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 295
 296 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 297         unsigned long offset, size_t size, enum dma_data_direction direction)
 298 {
 299         BUG_ON(direction == DMA_NONE);
 300
 301         plat_extra_sync_for_device(dev);
 302         if (!plat_device_is_coherent(dev)) {
 303                 unsigned long addr;
 304
 305                 addr = dma_addr_to_virt(dev, dma_handle);
 306                 __dma_sync(addr + offset, size, direction);
 307         }
 308 }
 309
 310 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 311
 312 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 313         enum dma_data_direction direction)
 314 {
 315         int i;
 316
 317         BUG_ON(direction == DMA_NONE);
 318
 319         /* Make sure that gcc doesn't leave the empty loop body.  */
 320         for (i = 0; i < nelems; i++, sg++) {
 321                 if (cpu_is_noncoherent_r10000(dev))
 322                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 323                                    sg->length, direction);
 324         }
 325 }
 326
 327 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 328
 329 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 330         enum dma_data_direction direction)
 331 {
 332         int i;
 333
 334         BUG_ON(direction == DMA_NONE);
 335
 336         /* Make sure that gcc doesn't leave the empty loop body.  */
 337         for (i = 0; i < nelems; i++, sg++) {
 338                 if (!plat_device_is_coherent(dev))
 339                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 340                                    sg->length, direction);
 341         }
 342 }
 343
 344 EXPORT_SYMBOL(dma_sync_sg_for_device);
 345
 346 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 347 {
 348         return plat_dma_mapping_error(dev, dma_addr);
 349 }
 350
 351 EXPORT_SYMBOL(dma_mapping_error);
 352
 353 int dma_supported(struct device *dev, u64 mask)
 354 {
 355         return plat_dma_supported(dev, mask);
 356 }
 357
 358 EXPORT_SYMBOL(dma_supported);
 359
 360 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 361 {
 362         return plat_device_is_coherent(dev);
 363 }
 364
 365 EXPORT_SYMBOL(dma_is_consistent);
 366
 367 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 368                enum dma_data_direction direction)
 369 {
 370         BUG_ON(direction == DMA_NONE);
 371
 372         plat_extra_sync_for_device(dev);
 373         if (!plat_device_is_coherent(dev))
 374                 __dma_sync((unsigned long)vaddr, size, direction);
 375 }
 376
 377 EXPORT_SYMBOL(dma_cache_sync);