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