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(dma_addr_t dma_addr)
  24 {
  25         unsigned long addr = plat_dma_addr_to_phys(dma_addr);
  26
  27         return (unsigned long)phys_to_virt(addr);
  28 }
  29
  30 /*
  31  * Warning on the terminology - Linux calls an uncached area coherent;
  32  * MIPS terminology calls memory areas with hardware maintained coherency
  33  * coherent.
  34  */
  35
  36 static inline int cpu_is_noncoherent_r10000(struct device *dev)
  37 {
  38         return !plat_device_is_coherent(dev) &&
  39                (current_cpu_type() == CPU_R10000 ||
  40                current_cpu_type() == CPU_R12000);
  41 }
  42
  43 static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
  44 {
  45         /* ignore region specifiers */
  46         gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
  47
  48 #ifdef CONFIG_ZONE_DMA32
  49         if (dev == NULL)
  50                 gfp |= __GFP_DMA;
  51         else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
  52                 gfp |= __GFP_DMA;
  53         else
  54 #endif
  55 #ifdef CONFIG_ZONE_DMA32
  56              if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
  57                 gfp |= __GFP_DMA32;
  58         else
  59 #endif
  60                 ;
  61
  62         /* Don't invoke OOM killer */
  63         gfp |= __GFP_NORETRY;
  64
  65         return gfp;
  66 }
  67
  68 void *dma_alloc_noncoherent(struct device *dev, size_t size,
  69         dma_addr_t * dma_handle, gfp_t gfp)
  70 {
  71         void *ret;
  72
  73         gfp = massage_gfp_flags(dev, gfp);
  74
  75         ret = (void *) __get_free_pages(gfp, get_order(size));
  76
  77         if (ret != NULL) {
  78                 memset(ret, 0, size);
  79                 *dma_handle = plat_map_dma_mem(dev, ret, size);
  80         }
  81
  82         return ret;
  83 }
  84
  85 EXPORT_SYMBOL(dma_alloc_noncoherent);
  86
  87 void *dma_alloc_coherent(struct device *dev, size_t size,
  88         dma_addr_t * dma_handle, gfp_t gfp)
  89 {
  90         void *ret;
  91
  92         gfp = massage_gfp_flags(dev, gfp);
  93
  94         ret = (void *) __get_free_pages(gfp, get_order(size));
  95
  96         if (ret) {
  97                 memset(ret, 0, size);
  98                 *dma_handle = plat_map_dma_mem(dev, ret, size);
  99
 100                 if (!plat_device_is_coherent(dev)) {
 101                         dma_cache_wback_inv((unsigned long) ret, size);
 102                         ret = UNCAC_ADDR(ret);
 103                 }
 104         }
 105
 106         return ret;
 107 }
 108
 109 EXPORT_SYMBOL(dma_alloc_coherent);
 110
 111 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 112         dma_addr_t dma_handle)
 113 {
 114         free_pages((unsigned long) vaddr, get_order(size));
 115 }
 116
 117 EXPORT_SYMBOL(dma_free_noncoherent);
 118
 119 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 120         dma_addr_t dma_handle)
 121 {
 122         unsigned long addr = (unsigned long) vaddr;
 123
 124         if (!plat_device_is_coherent(dev))
 125                 addr = CAC_ADDR(addr);
 126
 127         free_pages(addr, get_order(size));
 128 }
 129
 130 EXPORT_SYMBOL(dma_free_coherent);
 131
 132 static inline void __dma_sync(unsigned long addr, size_t size,
 133         enum dma_data_direction direction)
 134 {
 135         switch (direction) {
 136         case DMA_TO_DEVICE:
 137                 dma_cache_wback(addr, size);
 138                 break;
 139
 140         case DMA_FROM_DEVICE:
 141                 dma_cache_inv(addr, size);
 142                 break;
 143
 144         case DMA_BIDIRECTIONAL:
 145                 dma_cache_wback_inv(addr, size);
 146                 break;
 147
 148         default:
 149                 BUG();
 150         }
 151 }
 152
 153 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 154         enum dma_data_direction direction)
 155 {
 156         unsigned long addr = (unsigned long) ptr;
 157
 158         if (!plat_device_is_coherent(dev))
 159                 __dma_sync(addr, size, direction);
 160
 161         return plat_map_dma_mem(dev, ptr, size);
 162 }
 163
 164 EXPORT_SYMBOL(dma_map_single);
 165
 166 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 167         enum dma_data_direction direction)
 168 {
 169         if (cpu_is_noncoherent_r10000(dev))
 170                 __dma_sync(dma_addr_to_virt(dma_addr), size,
 171                            direction);
 172
 173         plat_unmap_dma_mem(dma_addr);
 174 }
 175
 176 EXPORT_SYMBOL(dma_unmap_single);
 177
 178 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 179         enum dma_data_direction direction)
 180 {
 181         int i;
 182
 183         BUG_ON(direction == DMA_NONE);
 184
 185         for (i = 0; i < nents; i++, sg++) {
 186                 unsigned long addr;
 187
 188                 addr = (unsigned long) sg_virt(sg);
 189                 if (!plat_device_is_coherent(dev) && addr)
 190                         __dma_sync(addr, sg->length, direction);
 191                 sg->dma_address = plat_map_dma_mem(dev,
 192                                                    (void *)addr, sg->length);
 193         }
 194
 195         return nents;
 196 }
 197
 198 EXPORT_SYMBOL(dma_map_sg);
 199
 200 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 201         unsigned long offset, size_t size, enum dma_data_direction direction)
 202 {
 203         BUG_ON(direction == DMA_NONE);
 204
 205         if (!plat_device_is_coherent(dev)) {
 206                 unsigned long addr;
 207
 208                 addr = (unsigned long) page_address(page) + offset;
 209                 dma_cache_wback_inv(addr, size);
 210         }
 211
 212         return plat_map_dma_mem_page(dev, page) + offset;
 213 }
 214
 215 EXPORT_SYMBOL(dma_map_page);
 216
 217 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 218         enum dma_data_direction direction)
 219 {
 220         BUG_ON(direction == DMA_NONE);
 221
 222         if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
 223                 unsigned long addr;
 224
 225                 addr = plat_dma_addr_to_phys(dma_address);
 226                 dma_cache_wback_inv(addr, size);
 227         }
 228
 229         plat_unmap_dma_mem(dma_address);
 230 }
 231
 232 EXPORT_SYMBOL(dma_unmap_page);
 233
 234 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 235         enum dma_data_direction direction)
 236 {
 237         unsigned long addr;
 238         int i;
 239
 240         BUG_ON(direction == DMA_NONE);
 241
 242         for (i = 0; i < nhwentries; i++, sg++) {
 243                 if (!plat_device_is_coherent(dev) &&
 244                     direction != DMA_TO_DEVICE) {
 245                         addr = (unsigned long) sg_virt(sg);
 246                         if (addr)
 247                                 __dma_sync(addr, sg->length, direction);
 248                 }
 249                 plat_unmap_dma_mem(sg->dma_address);
 250         }
 251 }
 252
 253 EXPORT_SYMBOL(dma_unmap_sg);
 254
 255 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 256         size_t size, enum dma_data_direction direction)
 257 {
 258         BUG_ON(direction == DMA_NONE);
 259
 260         if (cpu_is_noncoherent_r10000(dev)) {
 261                 unsigned long addr;
 262
 263                 addr = dma_addr_to_virt(dma_handle);
 264                 __dma_sync(addr, size, direction);
 265         }
 266 }
 267
 268 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 269
 270 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 271         size_t size, enum dma_data_direction direction)
 272 {
 273         BUG_ON(direction == DMA_NONE);
 274
 275         if (!plat_device_is_coherent(dev)) {
 276                 unsigned long addr;
 277
 278                 addr = dma_addr_to_virt(dma_handle);
 279                 __dma_sync(addr, size, direction);
 280         }
 281 }
 282
 283 EXPORT_SYMBOL(dma_sync_single_for_device);
 284
 285 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 286         unsigned long offset, size_t size, enum dma_data_direction direction)
 287 {
 288         BUG_ON(direction == DMA_NONE);
 289
 290         if (cpu_is_noncoherent_r10000(dev)) {
 291                 unsigned long addr;
 292
 293                 addr = dma_addr_to_virt(dma_handle);
 294                 __dma_sync(addr + offset, size, direction);
 295         }
 296 }
 297
 298 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 299
 300 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 301         unsigned long offset, size_t size, enum dma_data_direction direction)
 302 {
 303         BUG_ON(direction == DMA_NONE);
 304
 305         if (!plat_device_is_coherent(dev)) {
 306                 unsigned long addr;
 307
 308                 addr = dma_addr_to_virt(dma_handle);
 309                 __dma_sync(addr + offset, size, direction);
 310         }
 311 }
 312
 313 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 314
 315 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 316         enum dma_data_direction direction)
 317 {
 318         int i;
 319
 320         BUG_ON(direction == DMA_NONE);
 321
 322         /* Make sure that gcc doesn't leave the empty loop body.  */
 323         for (i = 0; i < nelems; i++, sg++) {
 324                 if (cpu_is_noncoherent_r10000(dev))
 325                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 326                                    sg->length, direction);
 327                 plat_unmap_dma_mem(sg->dma_address);
 328         }
 329 }
 330
 331 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 332
 333 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 334         enum dma_data_direction direction)
 335 {
 336         int i;
 337
 338         BUG_ON(direction == DMA_NONE);
 339
 340         /* Make sure that gcc doesn't leave the empty loop body.  */
 341         for (i = 0; i < nelems; i++, sg++) {
 342                 if (!plat_device_is_coherent(dev))
 343                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 344                                    sg->length, direction);
 345                 plat_unmap_dma_mem(sg->dma_address);
 346         }
 347 }
 348
 349 EXPORT_SYMBOL(dma_sync_sg_for_device);
 350
 351 int dma_mapping_error(dma_addr_t dma_addr)
 352 {
 353         return 0;
 354 }
 355
 356 EXPORT_SYMBOL(dma_mapping_error);
 357
 358 int dma_supported(struct device *dev, u64 mask)
 359 {
 360         /*
 361          * we fall back to GFP_DMA when the mask isn't all 1s,
 362          * so we can't guarantee allocations that must be
 363          * within a tighter range than GFP_DMA..
 364          */
 365         if (mask < DMA_BIT_MASK(24))
 366                 return 0;
 367
 368         return 1;
 369 }
 370
 371 EXPORT_SYMBOL(dma_supported);
 372
 373 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 374 {
 375         return plat_device_is_coherent(dev);
 376 }
 377
 378 EXPORT_SYMBOL(dma_is_consistent);
 379
 380 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 381                enum dma_data_direction direction)
 382 {
 383         BUG_ON(direction == DMA_NONE);
 384
 385         if (!plat_device_is_coherent(dev))
 386                 dma_cache_wback_inv((unsigned long)vaddr, size);
 387 }
 388
 389 EXPORT_SYMBOL(dma_cache_sync);