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
  18 #include <asm/cache.h>
  19 #include <asm/io.h>
  20
  21 #include <dma-coherence.h>
  22
  23 static inline unsigned long dma_addr_to_virt(struct device *dev,
  24         dma_addr_t dma_addr)
  25 {
  26         unsigned long addr = plat_dma_addr_to_phys(dev, dma_addr);
  27
  28         return (unsigned long)phys_to_virt(addr);
  29 }
  30
  31 /*
  32  * Warning on the terminology - Linux calls an uncached area coherent;
  33  * MIPS terminology calls memory areas with hardware maintained coherency
  34  * coherent.
  35  */
  36
  37 static inline int cpu_is_noncoherent_r10000(struct device *dev)
  38 {
  39         return !plat_device_is_coherent(dev) &&
  40                (current_cpu_type() == CPU_R10000 ||
  41                current_cpu_type() == CPU_R12000);
  42 }
  43
  44 static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
  45 {
  46         /* ignore region specifiers */
  47         gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  48
  49 #ifdef CONFIG_ZONE_DMA
  50         if (dev == NULL)
  51                 gfp |= __GFP_DMA;
  52         else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
  53                 gfp |= __GFP_DMA;
  54         else
  55 #endif
  56 #ifdef CONFIG_ZONE_DMA32
  57              if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
  58                 gfp |= __GFP_DMA32;
  59         else
  60 #endif
  61                 ;
  62
  63         /* Don't invoke OOM killer */
  64         gfp |= __GFP_NORETRY;
  65
  66         return gfp;
  67 }
  68
  69 void *dma_alloc_noncoherent(struct device *dev, size_t size,
  70         dma_addr_t * dma_handle, gfp_t gfp)
  71 {
  72         void *ret;
  73
  74         gfp = massage_gfp_flags(dev, gfp);
  75
  76         ret = (void *) __get_free_pages(gfp, get_order(size));
  77
  78         if (ret != NULL) {
  79                 memset(ret, 0, size);
  80                 *dma_handle = plat_map_dma_mem(dev, ret, size);
  81         }
  82
  83         return ret;
  84 }
  85
  86 EXPORT_SYMBOL(dma_alloc_noncoherent);
  87
  88 void *dma_alloc_coherent(struct device *dev, size_t size,
  89         dma_addr_t * dma_handle, gfp_t gfp)
  90 {
  91         void *ret;
  92
  93         if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
  94                 return ret;
  95
  96         gfp = massage_gfp_flags(dev, gfp);
  97
  98         ret = (void *) __get_free_pages(gfp, get_order(size));
  99
 100         if (ret) {
 101                 memset(ret, 0, size);
 102                 *dma_handle = plat_map_dma_mem(dev, ret, size);
 103
 104                 if (!plat_device_is_coherent(dev)) {
 105                         dma_cache_wback_inv((unsigned long) ret, size);
 106                         ret = UNCAC_ADDR(ret);
 107                 }
 108         }
 109
 110         return ret;
 111 }
 112
 113 EXPORT_SYMBOL(dma_alloc_coherent);
 114
 115 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 116         dma_addr_t dma_handle)
 117 {
 118         plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
 119         free_pages((unsigned long) vaddr, get_order(size));
 120 }
 121
 122 EXPORT_SYMBOL(dma_free_noncoherent);
 123
 124 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 125         dma_addr_t dma_handle)
 126 {
 127         unsigned long addr = (unsigned long) vaddr;
 128         int order = get_order(size);
 129
 130         if (dma_release_from_coherent(dev, order, vaddr))
 131                 return;
 132
 133         plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
 134
 135         if (!plat_device_is_coherent(dev))
 136                 addr = CAC_ADDR(addr);
 137
 138         free_pages(addr, get_order(size));
 139 }
 140
 141 EXPORT_SYMBOL(dma_free_coherent);
 142
 143 static inline void __dma_sync(unsigned long addr, size_t size,
 144         enum dma_data_direction direction)
 145 {
 146         switch (direction) {
 147         case DMA_TO_DEVICE:
 148                 dma_cache_wback(addr, size);
 149                 break;
 150
 151         case DMA_FROM_DEVICE:
 152                 dma_cache_inv(addr, size);
 153                 break;
 154
 155         case DMA_BIDIRECTIONAL:
 156                 dma_cache_wback_inv(addr, size);
 157                 break;
 158
 159         default:
 160                 BUG();
 161         }
 162 }
 163
 164 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 165         enum dma_data_direction direction)
 166 {
 167         unsigned long addr = (unsigned long) ptr;
 168
 169         if (!plat_device_is_coherent(dev))
 170                 __dma_sync(addr, size, direction);
 171
 172         return plat_map_dma_mem(dev, ptr, size);
 173 }
 174
 175 EXPORT_SYMBOL(dma_map_single);
 176
 177 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 178         enum dma_data_direction direction)
 179 {
 180         if (cpu_is_noncoherent_r10000(dev))
 181                 __dma_sync(dma_addr_to_virt(dev, dma_addr), size,
 182                            direction);
 183
 184         plat_unmap_dma_mem(dev, dma_addr, size, direction);
 185 }
 186
 187 EXPORT_SYMBOL(dma_unmap_single);
 188
 189 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 190         enum dma_data_direction direction)
 191 {
 192         int i;
 193
 194         BUG_ON(direction == DMA_NONE);
 195
 196         for (i = 0; i < nents; i++, sg++) {
 197                 unsigned long addr;
 198
 199                 addr = (unsigned long) sg_virt(sg);
 200                 if (!plat_device_is_coherent(dev) && addr)
 201                         __dma_sync(addr, sg->length, direction);
 202                 sg->dma_address = plat_map_dma_mem(dev,
 203                                                    (void *)addr, sg->length);
 204         }
 205
 206         return nents;
 207 }
 208
 209 EXPORT_SYMBOL(dma_map_sg);
 210
 211 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 212         unsigned long offset, size_t size, enum dma_data_direction direction)
 213 {
 214         BUG_ON(direction == DMA_NONE);
 215
 216         if (!plat_device_is_coherent(dev)) {
 217                 unsigned long addr;
 218
 219                 addr = (unsigned long) page_address(page) + offset;
 220                 __dma_sync(addr, size, direction);
 221         }
 222
 223         return plat_map_dma_mem_page(dev, page) + offset;
 224 }
 225
 226 EXPORT_SYMBOL(dma_map_page);
 227
 228 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 229         enum dma_data_direction direction)
 230 {
 231         unsigned long addr;
 232         int i;
 233
 234         BUG_ON(direction == DMA_NONE);
 235
 236         for (i = 0; i < nhwentries; i++, sg++) {
 237                 if (!plat_device_is_coherent(dev) &&
 238                     direction != DMA_TO_DEVICE) {
 239                         addr = (unsigned long) sg_virt(sg);
 240                         if (addr)
 241                                 __dma_sync(addr, sg->length, direction);
 242                 }
 243                 plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
 244         }
 245 }
 246
 247 EXPORT_SYMBOL(dma_unmap_sg);
 248
 249 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 250         size_t size, enum dma_data_direction direction)
 251 {
 252         BUG_ON(direction == DMA_NONE);
 253
 254         if (cpu_is_noncoherent_r10000(dev)) {
 255                 unsigned long addr;
 256
 257                 addr = dma_addr_to_virt(dev, dma_handle);
 258                 __dma_sync(addr, size, direction);
 259         }
 260 }
 261
 262 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 263
 264 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 265         size_t size, enum dma_data_direction direction)
 266 {
 267         BUG_ON(direction == DMA_NONE);
 268
 269         plat_extra_sync_for_device(dev);
 270         if (!plat_device_is_coherent(dev)) {
 271                 unsigned long addr;
 272
 273                 addr = dma_addr_to_virt(dev, dma_handle);
 274                 __dma_sync(addr, size, direction);
 275         }
 276 }
 277
 278 EXPORT_SYMBOL(dma_sync_single_for_device);
 279
 280 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 281         unsigned long offset, size_t size, enum dma_data_direction direction)
 282 {
 283         BUG_ON(direction == DMA_NONE);
 284
 285         if (cpu_is_noncoherent_r10000(dev)) {
 286                 unsigned long addr;
 287
 288                 addr = dma_addr_to_virt(dev, dma_handle);
 289                 __dma_sync(addr + offset, size, direction);
 290         }
 291 }
 292
 293 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 294
 295 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 296         unsigned long offset, size_t size, enum dma_data_direction direction)
 297 {
 298         BUG_ON(direction == DMA_NONE);
 299
 300         plat_extra_sync_for_device(dev);
 301         if (!plat_device_is_coherent(dev)) {
 302                 unsigned long addr;
 303
 304                 addr = dma_addr_to_virt(dev, dma_handle);
 305                 __dma_sync(addr + offset, size, direction);
 306         }
 307 }
 308
 309 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 310
 311 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 312         enum dma_data_direction direction)
 313 {
 314         int i;
 315
 316         BUG_ON(direction == DMA_NONE);
 317
 318         /* Make sure that gcc doesn't leave the empty loop body.  */
 319         for (i = 0; i < nelems; i++, sg++) {
 320                 if (cpu_is_noncoherent_r10000(dev))
 321                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 322                                    sg->length, direction);
 323         }
 324 }
 325
 326 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 327
 328 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 329         enum dma_data_direction direction)
 330 {
 331         int i;
 332
 333         BUG_ON(direction == DMA_NONE);
 334
 335         /* Make sure that gcc doesn't leave the empty loop body.  */
 336         for (i = 0; i < nelems; i++, sg++) {
 337                 if (!plat_device_is_coherent(dev))
 338                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 339                                    sg->length, direction);
 340         }
 341 }
 342
 343 EXPORT_SYMBOL(dma_sync_sg_for_device);
 344
 345 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 346 {
 347         return plat_dma_mapping_error(dev, dma_addr);
 348 }
 349
 350 EXPORT_SYMBOL(dma_mapping_error);
 351
 352 int dma_supported(struct device *dev, u64 mask)
 353 {
 354         return plat_dma_supported(dev, mask);
 355 }
 356
 357 EXPORT_SYMBOL(dma_supported);
 358
 359 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 360 {
 361         return plat_device_is_coherent(dev);
 362 }
 363
 364 EXPORT_SYMBOL(dma_is_consistent);
 365
 366 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 367                enum dma_data_direction direction)
 368 {
 369         BUG_ON(direction == DMA_NONE);
 370
 371         plat_extra_sync_for_device(dev);
 372         if (!plat_device_is_coherent(dev))
 373                 __dma_sync((unsigned long)vaddr, size, direction);
 374 }
 375
 376 EXPORT_SYMBOL(dma_cache_sync);