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_DMA
  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         plat_unmap_dma_mem(dma_handle);
 115         free_pages((unsigned long) vaddr, get_order(size));
 116 }
 117
 118 EXPORT_SYMBOL(dma_free_noncoherent);
 119
 120 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 121         dma_addr_t dma_handle)
 122 {
 123         unsigned long addr = (unsigned long) vaddr;
 124
 125         plat_unmap_dma_mem(dma_handle);
 126
 127         if (!plat_device_is_coherent(dev))
 128                 addr = CAC_ADDR(addr);
 129
 130         free_pages(addr, get_order(size));
 131 }
 132
 133 EXPORT_SYMBOL(dma_free_coherent);
 134
 135 static inline void __dma_sync(unsigned long addr, size_t size,
 136         enum dma_data_direction direction)
 137 {
 138         switch (direction) {
 139         case DMA_TO_DEVICE:
 140                 dma_cache_wback(addr, size);
 141                 break;
 142
 143         case DMA_FROM_DEVICE:
 144                 dma_cache_inv(addr, size);
 145                 break;
 146
 147         case DMA_BIDIRECTIONAL:
 148                 dma_cache_wback_inv(addr, size);
 149                 break;
 150
 151         default:
 152                 BUG();
 153         }
 154 }
 155
 156 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 157         enum dma_data_direction direction)
 158 {
 159         unsigned long addr = (unsigned long) ptr;
 160
 161         if (!plat_device_is_coherent(dev))
 162                 __dma_sync(addr, size, direction);
 163
 164         return plat_map_dma_mem(dev, ptr, size);
 165 }
 166
 167 EXPORT_SYMBOL(dma_map_single);
 168
 169 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 170         enum dma_data_direction direction)
 171 {
 172         if (cpu_is_noncoherent_r10000(dev))
 173                 __dma_sync(dma_addr_to_virt(dma_addr), size,
 174                            direction);
 175
 176         plat_unmap_dma_mem(dma_addr);
 177 }
 178
 179 EXPORT_SYMBOL(dma_unmap_single);
 180
 181 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 182         enum dma_data_direction direction)
 183 {
 184         int i;
 185
 186         BUG_ON(direction == DMA_NONE);
 187
 188         for (i = 0; i < nents; i++, sg++) {
 189                 unsigned long addr;
 190
 191                 addr = (unsigned long) sg_virt(sg);
 192                 if (!plat_device_is_coherent(dev) && addr)
 193                         __dma_sync(addr, sg->length, direction);
 194                 sg->dma_address = plat_map_dma_mem(dev,
 195                                                    (void *)addr, sg->length);
 196         }
 197
 198         return nents;
 199 }
 200
 201 EXPORT_SYMBOL(dma_map_sg);
 202
 203 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 204         unsigned long offset, size_t size, enum dma_data_direction direction)
 205 {
 206         BUG_ON(direction == DMA_NONE);
 207
 208         if (!plat_device_is_coherent(dev)) {
 209                 unsigned long addr;
 210
 211                 addr = (unsigned long) page_address(page) + offset;
 212                 dma_cache_wback_inv(addr, size);
 213         }
 214
 215         return plat_map_dma_mem_page(dev, page) + offset;
 216 }
 217
 218 EXPORT_SYMBOL(dma_map_page);
 219
 220 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 221         enum dma_data_direction direction)
 222 {
 223         BUG_ON(direction == DMA_NONE);
 224
 225         if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
 226                 unsigned long addr;
 227
 228                 addr = plat_dma_addr_to_phys(dma_address);
 229                 dma_cache_wback_inv(addr, size);
 230         }
 231
 232         plat_unmap_dma_mem(dma_address);
 233 }
 234
 235 EXPORT_SYMBOL(dma_unmap_page);
 236
 237 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 238         enum dma_data_direction direction)
 239 {
 240         unsigned long addr;
 241         int i;
 242
 243         BUG_ON(direction == DMA_NONE);
 244
 245         for (i = 0; i < nhwentries; i++, sg++) {
 246                 if (!plat_device_is_coherent(dev) &&
 247                     direction != DMA_TO_DEVICE) {
 248                         addr = (unsigned long) sg_virt(sg);
 249                         if (addr)
 250                                 __dma_sync(addr, sg->length, direction);
 251                 }
 252                 plat_unmap_dma_mem(sg->dma_address);
 253         }
 254 }
 255
 256 EXPORT_SYMBOL(dma_unmap_sg);
 257
 258 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 259         size_t size, enum dma_data_direction direction)
 260 {
 261         BUG_ON(direction == DMA_NONE);
 262
 263         if (cpu_is_noncoherent_r10000(dev)) {
 264                 unsigned long addr;
 265
 266                 addr = dma_addr_to_virt(dma_handle);
 267                 __dma_sync(addr, size, direction);
 268         }
 269 }
 270
 271 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 272
 273 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 274         size_t size, enum dma_data_direction direction)
 275 {
 276         BUG_ON(direction == DMA_NONE);
 277
 278         if (!plat_device_is_coherent(dev)) {
 279                 unsigned long addr;
 280
 281                 addr = dma_addr_to_virt(dma_handle);
 282                 __dma_sync(addr, size, direction);
 283         }
 284 }
 285
 286 EXPORT_SYMBOL(dma_sync_single_for_device);
 287
 288 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 289         unsigned long offset, size_t size, enum dma_data_direction direction)
 290 {
 291         BUG_ON(direction == DMA_NONE);
 292
 293         if (cpu_is_noncoherent_r10000(dev)) {
 294                 unsigned long addr;
 295
 296                 addr = dma_addr_to_virt(dma_handle);
 297                 __dma_sync(addr + offset, size, direction);
 298         }
 299 }
 300
 301 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 302
 303 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 304         unsigned long offset, size_t size, enum dma_data_direction direction)
 305 {
 306         BUG_ON(direction == DMA_NONE);
 307
 308         if (!plat_device_is_coherent(dev)) {
 309                 unsigned long addr;
 310
 311                 addr = dma_addr_to_virt(dma_handle);
 312                 __dma_sync(addr + offset, size, direction);
 313         }
 314 }
 315
 316 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 317
 318 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 319         enum dma_data_direction direction)
 320 {
 321         int i;
 322
 323         BUG_ON(direction == DMA_NONE);
 324
 325         /* Make sure that gcc doesn't leave the empty loop body.  */
 326         for (i = 0; i < nelems; i++, sg++) {
 327                 if (cpu_is_noncoherent_r10000(dev))
 328                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 329                                    sg->length, direction);
 330         }
 331 }
 332
 333 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 334
 335 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 336         enum dma_data_direction direction)
 337 {
 338         int i;
 339
 340         BUG_ON(direction == DMA_NONE);
 341
 342         /* Make sure that gcc doesn't leave the empty loop body.  */
 343         for (i = 0; i < nelems; i++, sg++) {
 344                 if (!plat_device_is_coherent(dev))
 345                         __dma_sync((unsigned long)page_address(sg_page(sg)),
 346                                    sg->length, direction);
 347         }
 348 }
 349
 350 EXPORT_SYMBOL(dma_sync_sg_for_device);
 351
 352 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 353 {
 354         return 0;
 355 }
 356
 357 EXPORT_SYMBOL(dma_mapping_error);
 358
 359 int dma_supported(struct device *dev, u64 mask)
 360 {
 361         /*
 362          * we fall back to GFP_DMA when the mask isn't all 1s,
 363          * so we can't guarantee allocations that must be
 364          * within a tighter range than GFP_DMA..
 365          */
 366         if (mask < DMA_BIT_MASK(24))
 367                 return 0;
 368
 369         return 1;
 370 }
 371
 372 EXPORT_SYMBOL(dma_supported);
 373
 374 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 375 {
 376         return plat_device_is_coherent(dev);
 377 }
 378
 379 EXPORT_SYMBOL(dma_is_consistent);
 380
 381 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 382                enum dma_data_direction direction)
 383 {
 384         BUG_ON(direction == DMA_NONE);
 385
 386         if (!plat_device_is_coherent(dev))
 387                 __dma_sync((unsigned long)vaddr, size, direction);
 388 }
 389
 390 EXPORT_SYMBOL(dma_cache_sync);