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         gfp_t dma_flag;
  47
  48         /* ignore region specifiers */
  49         gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  50
  51 #ifdef CONFIG_ISA
  52         if (dev == NULL)
  53                 dma_flag = __GFP_DMA;
  54         else
  55 #endif
  56 #if defined(CONFIG_ZONE_DMA32) && defined(CONFIG_ZONE_DMA)
  57              if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
  58                         dma_flag = __GFP_DMA;
  59         else if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
  60                         dma_flag = __GFP_DMA32;
  61         else
  62 #endif
  63 #if defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_ZONE_DMA)
  64              if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
  65                 dma_flag = __GFP_DMA32;
  66         else
  67 #endif
  68 #if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32)
  69              if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
  70                 dma_flag = __GFP_DMA;
  71         else
  72 #endif
  73                 dma_flag = 0;
  74
  75         /* Don't invoke OOM killer */
  76         gfp |= __GFP_NORETRY;
  77
  78         return gfp | dma_flag;
  79 }
  80
  81 void *dma_alloc_noncoherent(struct device *dev, size_t size,
  82         dma_addr_t * dma_handle, gfp_t gfp)
  83 {
  84         void *ret;
  85
  86         gfp = massage_gfp_flags(dev, gfp);
  87
  88         ret = (void *) __get_free_pages(gfp, get_order(size));
  89
  90         if (ret != NULL) {
  91                 memset(ret, 0, size);
  92                 *dma_handle = plat_map_dma_mem(dev, ret, size);
  93         }
  94
  95         return ret;
  96 }
  97
  98 EXPORT_SYMBOL(dma_alloc_noncoherent);
  99
 100 void *dma_alloc_coherent(struct device *dev, size_t size,
 101         dma_addr_t * dma_handle, gfp_t gfp)
 102 {
 103         void *ret;
 104
 105         if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
 106                 return ret;
 107
 108         gfp = massage_gfp_flags(dev, gfp);
 109
 110         ret = (void *) __get_free_pages(gfp, get_order(size));
 111
 112         if (ret) {
 113                 memset(ret, 0, size);
 114                 *dma_handle = plat_map_dma_mem(dev, ret, size);
 115
 116                 if (!plat_device_is_coherent(dev)) {
 117                         dma_cache_wback_inv((unsigned long) ret, size);
 118                         ret = UNCAC_ADDR(ret);
 119                 }
 120         }
 121
 122         return ret;
 123 }
 124
 125 EXPORT_SYMBOL(dma_alloc_coherent);
 126
 127 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 128         dma_addr_t dma_handle)
 129 {
 130         plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
 131         free_pages((unsigned long) vaddr, get_order(size));
 132 }
 133
 134 EXPORT_SYMBOL(dma_free_noncoherent);
 135
 136 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 137         dma_addr_t dma_handle)
 138 {
 139         unsigned long addr = (unsigned long) vaddr;
 140         int order = get_order(size);
 141
 142         if (dma_release_from_coherent(dev, order, vaddr))
 143                 return;
 144
 145         plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
 146
 147         if (!plat_device_is_coherent(dev))
 148                 addr = CAC_ADDR(addr);
 149
 150         free_pages(addr, get_order(size));
 151 }
 152
 153 EXPORT_SYMBOL(dma_free_coherent);
 154
 155 static inline void __dma_sync(unsigned long addr, size_t size,
 156         enum dma_data_direction direction)
 157 {
 158         switch (direction) {
 159         case DMA_TO_DEVICE:
 160                 dma_cache_wback(addr, size);
 161                 break;
 162
 163         case DMA_FROM_DEVICE:
 164                 dma_cache_inv(addr, size);
 165                 break;
 166
 167         case DMA_BIDIRECTIONAL:
 168                 dma_cache_wback_inv(addr, size);
 169                 break;
 170
 171         default:
 172                 BUG();
 173         }
 174 }
 175
 176 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 177         enum dma_data_direction direction)
 178 {
 179         unsigned long addr = (unsigned long) ptr;
 180
 181         if (!plat_device_is_coherent(dev))
 182                 __dma_sync(addr, size, direction);
 183
 184         return plat_map_dma_mem(dev, ptr, size);
 185 }
 186
 187 EXPORT_SYMBOL(dma_map_single);
 188
 189 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 190         enum dma_data_direction direction)
 191 {
 192         if (cpu_is_noncoherent_r10000(dev))
 193                 __dma_sync(dma_addr_to_virt(dev, dma_addr), size,
 194                            direction);
 195
 196         plat_unmap_dma_mem(dev, dma_addr, size, direction);
 197 }
 198
 199 EXPORT_SYMBOL(dma_unmap_single);
 200
 201 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 202         enum dma_data_direction direction)
 203 {
 204         int i;
 205
 206         BUG_ON(direction == DMA_NONE);
 207
 208         for (i = 0; i < nents; i++, sg++) {
 209                 unsigned long addr;
 210
 211                 addr = (unsigned long) sg_virt(sg);
 212                 if (!plat_device_is_coherent(dev) && addr)
 213                         __dma_sync(addr, sg->length, direction);
 214                 sg->dma_address = plat_map_dma_mem(dev,
 215                                                    (void *)addr, sg->length);
 216         }
 217
 218         return nents;
 219 }
 220
 221 EXPORT_SYMBOL(dma_map_sg);
 222
 223 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 224         unsigned long offset, size_t size, enum dma_data_direction direction)
 225 {
 226         BUG_ON(direction == DMA_NONE);
 227
 228         if (!plat_device_is_coherent(dev)) {
 229                 unsigned long addr;
 230
 231                 addr = (unsigned long) page_address(page) + offset;
 232                 __dma_sync(addr, size, direction);
 233         }
 234
 235         return plat_map_dma_mem_page(dev, page) + offset;
 236 }
 237
 238 EXPORT_SYMBOL(dma_map_page);
 239
 240 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 241         enum dma_data_direction direction)
 242 {
 243         unsigned long addr;
 244         int i;
 245
 246         BUG_ON(direction == DMA_NONE);
 247
 248         for (i = 0; i < nhwentries; i++, sg++) {
 249                 if (!plat_device_is_coherent(dev) &&
 250                     direction != DMA_TO_DEVICE) {
 251                         addr = (unsigned long) sg_virt(sg);
 252                         if (addr)
 253                                 __dma_sync(addr, sg->length, direction);
 254                 }
 255                 plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
 256         }
 257 }
 258
 259 EXPORT_SYMBOL(dma_unmap_sg);
 260
 261 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 262         size_t size, enum dma_data_direction direction)
 263 {
 264         BUG_ON(direction == DMA_NONE);
 265
 266         if (cpu_is_noncoherent_r10000(dev)) {
 267                 unsigned long addr;
 268
 269                 addr = dma_addr_to_virt(dev, dma_handle);
 270                 __dma_sync(addr, size, direction);
 271         }
 272 }
 273
 274 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 275
 276 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 277         size_t size, enum dma_data_direction direction)
 278 {
 279         BUG_ON(direction == DMA_NONE);
 280
 281         plat_extra_sync_for_device(dev);
 282         if (!plat_device_is_coherent(dev)) {
 283                 unsigned long addr;
 284
 285                 addr = dma_addr_to_virt(dev, dma_handle);
 286                 __dma_sync(addr, size, direction);
 287         }
 288 }
 289
 290 EXPORT_SYMBOL(dma_sync_single_for_device);
 291
 292 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 293         unsigned long offset, size_t size, enum dma_data_direction direction)
 294 {
 295         BUG_ON(direction == DMA_NONE);
 296
 297         if (cpu_is_noncoherent_r10000(dev)) {
 298                 unsigned long addr;
 299
 300                 addr = dma_addr_to_virt(dev, dma_handle);
 301                 __dma_sync(addr + offset, size, direction);
 302         }
 303 }
 304
 305 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 306
 307 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 308         unsigned long offset, size_t size, enum dma_data_direction direction)
 309 {
 310         BUG_ON(direction == DMA_NONE);
 311
 312         plat_extra_sync_for_device(dev);
 313         if (!plat_device_is_coherent(dev)) {
 314                 unsigned long addr;
 315
 316                 addr = dma_addr_to_virt(dev, dma_handle);
 317                 __dma_sync(addr + offset, size, direction);
 318         }
 319 }
 320
 321 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 322
 323 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 324         enum dma_data_direction direction)
 325 {
 326         int i;
 327
 328         BUG_ON(direction == DMA_NONE);
 329
 330         /* Make sure that gcc doesn't leave the empty loop body.  */
 331         for (i = 0; i < nelems; i++, sg++) {
 332                 if (cpu_is_noncoherent_r10000(dev))
 333                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 334                                    sg->length, direction);
 335         }
 336 }
 337
 338 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 339
 340 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 341         enum dma_data_direction direction)
 342 {
 343         int i;
 344
 345         BUG_ON(direction == DMA_NONE);
 346
 347         /* Make sure that gcc doesn't leave the empty loop body.  */
 348         for (i = 0; i < nelems; i++, sg++) {
 349                 if (!plat_device_is_coherent(dev))
 350                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 351                                    sg->length, direction);
 352         }
 353 }
 354
 355 EXPORT_SYMBOL(dma_sync_sg_for_device);
 356
 357 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 358 {
 359         return plat_dma_mapping_error(dev, dma_addr);
 360 }
 361
 362 EXPORT_SYMBOL(dma_mapping_error);
 363
 364 int dma_supported(struct device *dev, u64 mask)
 365 {
 366         return plat_dma_supported(dev, mask);
 367 }
 368
 369 EXPORT_SYMBOL(dma_supported);
 370
 371 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 372 {
 373         return plat_device_is_coherent(dev);
 374 }
 375
 376 EXPORT_SYMBOL(dma_is_consistent);
 377
 378 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 379                enum dma_data_direction direction)
 380 {
 381         BUG_ON(direction == DMA_NONE);
 382
 383         plat_extra_sync_for_device(dev);
 384         if (!plat_device_is_coherent(dev))
 385                 __dma_sync((unsigned long)vaddr, size, direction);
 386 }
 387
 388 EXPORT_SYMBOL(dma_cache_sync);