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