include/asm-powerpc/dma-mapping.h

   1 /*
   2  * Copyright (C) 2004 IBM
   3  *
   4  * Implements the generic device dma API for powerpc.
   5  * the pci and vio busses
   6  */
   7 #ifndef _ASM_DMA_MAPPING_H
   8 #define _ASM_DMA_MAPPING_H
   9 #ifdef __KERNEL__
  10
  11 #include <linux/types.h>
  12 #include <linux/cache.h>
  13 /* need struct page definitions */
  14 #include <linux/mm.h>
  15 #include <linux/scatterlist.h>
  16 #include <linux/dma-attrs.h>
  17 #include <asm/io.h>
  18
  19 #define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
  20
  21 #ifdef CONFIG_NOT_COHERENT_CACHE
  22 /*
  23  * DMA-consistent mapping functions for PowerPCs that don't support
  24  * cache snooping.  These allocate/free a region of uncached mapped
  25  * memory space for use with DMA devices.  Alternatively, you could
  26  * allocate the space "normally" and use the cache management functions
  27  * to ensure it is consistent.
  28  */
  29 extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
  30 extern void __dma_free_coherent(size_t size, void *vaddr);
  31 extern void __dma_sync(void *vaddr, size_t size, int direction);
  32 extern void __dma_sync_page(struct page *page, unsigned long offset,
  33                                  size_t size, int direction);
  34
  35 #else /* ! CONFIG_NOT_COHERENT_CACHE */
  36 /*
  37  * Cache coherent cores.
  38  */
  39
  40 #define __dma_alloc_coherent(gfp, size, handle) NULL
  41 #define __dma_free_coherent(size, addr)         ((void)0)
  42 #define __dma_sync(addr, size, rw)              ((void)0)
  43 #define __dma_sync_page(pg, off, sz, rw)        ((void)0)
  44
  45 #endif /* ! CONFIG_NOT_COHERENT_CACHE */
  46
  47 #ifdef CONFIG_PPC64
  48
  49 static inline unsigned long device_to_mask(struct device *dev)
  50 {
  51         if (dev->dma_mask && *dev->dma_mask)
  52                 return *dev->dma_mask;
  53         /* Assume devices without mask can take 32 bit addresses */
  54         return 0xfffffffful;
  55 }
  56
  57 /*
  58  * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
  59  */
  60 struct dma_mapping_ops {
  61         void *          (*alloc_coherent)(struct device *dev, size_t size,
  62                                 dma_addr_t *dma_handle, gfp_t flag);
  63         void            (*free_coherent)(struct device *dev, size_t size,
  64                                 void *vaddr, dma_addr_t dma_handle);
  65         dma_addr_t      (*map_single)(struct device *dev, void *ptr,
  66                                 size_t size, enum dma_data_direction direction,
  67                                 struct dma_attrs *attrs);
  68         void            (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
  69                                 size_t size, enum dma_data_direction direction,
  70                                 struct dma_attrs *attrs);
  71         int             (*map_sg)(struct device *dev, struct scatterlist *sg,
  72                                 int nents, enum dma_data_direction direction,
  73                                 struct dma_attrs *attrs);
  74         void            (*unmap_sg)(struct device *dev, struct scatterlist *sg,
  75                                 int nents, enum dma_data_direction direction,
  76                                 struct dma_attrs *attrs);
  77         int             (*dma_supported)(struct device *dev, u64 mask);
  78         int             (*set_dma_mask)(struct device *dev, u64 dma_mask);
  79 };
  80
  81 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
  82 {
  83         /* We don't handle the NULL dev case for ISA for now. We could
  84          * do it via an out of line call but it is not needed for now. The
  85          * only ISA DMA device we support is the floppy and we have a hack
  86          * in the floppy driver directly to get a device for us.
  87          */
  88         if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
  89                 return NULL;
  90         return dev->archdata.dma_ops;
  91 }
  92
  93 static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
  94 {
  95         dev->archdata.dma_ops = ops;
  96 }
  97
  98 static inline int dma_supported(struct device *dev, u64 mask)
  99 {
 100         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 101
 102         if (unlikely(dma_ops == NULL))
 103                 return 0;
 104         if (dma_ops->dma_supported == NULL)
 105                 return 1;
 106         return dma_ops->dma_supported(dev, mask);
 107 }
 108
 109 /* We have our own implementation of pci_set_dma_mask() */
 110 #define HAVE_ARCH_PCI_SET_DMA_MASK
 111
 112 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 113 {
 114         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 115
 116         if (unlikely(dma_ops == NULL))
 117                 return -EIO;
 118         if (dma_ops->set_dma_mask != NULL)
 119                 return dma_ops->set_dma_mask(dev, dma_mask);
 120         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 121                 return -EIO;
 122         *dev->dma_mask = dma_mask;
 123         return 0;
 124 }
 125
 126 static inline dma_addr_t dma_map_single_attrs(struct device *dev,
 127                                               void *cpu_addr,
 128                                               size_t size,
 129                                               enum dma_data_direction direction,
 130                                               struct dma_attrs *attrs)
 131 {
 132         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 133
 134         BUG_ON(!dma_ops);
 135         return dma_ops->map_single(dev, cpu_addr, size, direction, attrs);
 136 }
 137
 138 static inline void dma_unmap_single_attrs(struct device *dev,
 139                                           dma_addr_t dma_addr,
 140                                           size_t size,
 141                                           enum dma_data_direction direction,
 142                                           struct dma_attrs *attrs)
 143 {
 144         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 145
 146         BUG_ON(!dma_ops);
 147         dma_ops->unmap_single(dev, dma_addr, size, direction, attrs);
 148 }
 149
 150 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 151                                             struct page *page,
 152                                             unsigned long offset, size_t size,
 153                                             enum dma_data_direction direction,
 154                                             struct dma_attrs *attrs)
 155 {
 156         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 157
 158         BUG_ON(!dma_ops);
 159         return dma_ops->map_single(dev, page_address(page) + offset, size,
 160                         direction, attrs);
 161 }
 162
 163 static inline void dma_unmap_page_attrs(struct device *dev,
 164                                         dma_addr_t dma_address,
 165                                         size_t size,
 166                                         enum dma_data_direction direction,
 167                                         struct dma_attrs *attrs)
 168 {
 169         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 170
 171         BUG_ON(!dma_ops);
 172         dma_ops->unmap_single(dev, dma_address, size, direction, attrs);
 173 }
 174
 175 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 176                                    int nents, enum dma_data_direction direction,
 177                                    struct dma_attrs *attrs)
 178 {
 179         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 180
 181         BUG_ON(!dma_ops);
 182         return dma_ops->map_sg(dev, sg, nents, direction, attrs);
 183 }
 184
 185 static inline void dma_unmap_sg_attrs(struct device *dev,
 186                                       struct scatterlist *sg,
 187                                       int nhwentries,
 188                                       enum dma_data_direction direction,
 189                                       struct dma_attrs *attrs)
 190 {
 191         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 192
 193         BUG_ON(!dma_ops);
 194         dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
 195 }
 196
 197 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 198                                        dma_addr_t *dma_handle, gfp_t flag)
 199 {
 200         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 201
 202         BUG_ON(!dma_ops);
 203         return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
 204 }
 205
 206 static inline void dma_free_coherent(struct device *dev, size_t size,
 207                                      void *cpu_addr, dma_addr_t dma_handle)
 208 {
 209         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 210
 211         BUG_ON(!dma_ops);
 212         dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
 213 }
 214
 215 static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
 216                                         size_t size,
 217                                         enum dma_data_direction direction)
 218 {
 219         return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
 220 }
 221
 222 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 223                                     size_t size,
 224                                     enum dma_data_direction direction)
 225 {
 226         dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
 227 }
 228
 229 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 230                                       unsigned long offset, size_t size,
 231                                       enum dma_data_direction direction)
 232 {
 233         return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
 234 }
 235
 236 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 237                                   size_t size,
 238                                   enum dma_data_direction direction)
 239 {
 240         dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
 241 }
 242
 243 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
 244                              int nents, enum dma_data_direction direction)
 245 {
 246         return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
 247 }
 248
 249 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 250                                 int nhwentries,
 251                                 enum dma_data_direction direction)
 252 {
 253         dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
 254 }
 255
 256 /*
 257  * Available generic sets of operations
 258  */
 259 extern struct dma_mapping_ops dma_iommu_ops;
 260 extern struct dma_mapping_ops dma_direct_ops;
 261
 262 #else /* CONFIG_PPC64 */
 263
 264 #define dma_supported(dev, mask)        (1)
 265
 266 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 267 {
 268         if (!dev->dma_mask || !dma_supported(dev, mask))
 269                 return -EIO;
 270
 271         *dev->dma_mask = dma_mask;
 272
 273         return 0;
 274 }
 275
 276 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 277                                        dma_addr_t * dma_handle,
 278                                        gfp_t gfp)
 279 {
 280 #ifdef CONFIG_NOT_COHERENT_CACHE
 281         return __dma_alloc_coherent(size, dma_handle, gfp);
 282 #else
 283         void *ret;
 284         /* ignore region specifiers */
 285         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
 286
 287         if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
 288                 gfp |= GFP_DMA;
 289
 290         ret = (void *)__get_free_pages(gfp, get_order(size));
 291
 292         if (ret != NULL) {
 293                 memset(ret, 0, size);
 294                 *dma_handle = virt_to_bus(ret);
 295         }
 296
 297         return ret;
 298 #endif
 299 }
 300
 301 static inline void
 302 dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 303                   dma_addr_t dma_handle)
 304 {
 305 #ifdef CONFIG_NOT_COHERENT_CACHE
 306         __dma_free_coherent(size, vaddr);
 307 #else
 308         free_pages((unsigned long)vaddr, get_order(size));
 309 #endif
 310 }
 311
 312 static inline dma_addr_t
 313 dma_map_single(struct device *dev, void *ptr, size_t size,
 314                enum dma_data_direction direction)
 315 {
 316         BUG_ON(direction == DMA_NONE);
 317
 318         __dma_sync(ptr, size, direction);
 319
 320         return virt_to_bus(ptr);
 321 }
 322
 323 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 324                                     size_t size,
 325                                     enum dma_data_direction direction)
 326 {
 327         /* We do nothing. */
 328 }
 329
 330 static inline dma_addr_t
 331 dma_map_page(struct device *dev, struct page *page,
 332              unsigned long offset, size_t size,
 333              enum dma_data_direction direction)
 334 {
 335         BUG_ON(direction == DMA_NONE);
 336
 337         __dma_sync_page(page, offset, size, direction);
 338
 339         return page_to_bus(page) + offset;
 340 }
 341
 342 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 343                                   size_t size,
 344                                   enum dma_data_direction direction)
 345 {
 346         /* We do nothing. */
 347 }
 348
 349 static inline int
 350 dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
 351            enum dma_data_direction direction)
 352 {
 353         struct scatterlist *sg;
 354         int i;
 355
 356         BUG_ON(direction == DMA_NONE);
 357
 358         for_each_sg(sgl, sg, nents, i) {
 359                 BUG_ON(!sg_page(sg));
 360                 __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
 361                 sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
 362         }
 363
 364         return nents;
 365 }
 366
 367 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 368                                 int nhwentries,
 369                                 enum dma_data_direction direction)
 370 {
 371         /* We don't do anything here. */
 372 }
 373
 374 #endif /* CONFIG_PPC64 */
 375
 376 static inline void dma_sync_single_for_cpu(struct device *dev,
 377                 dma_addr_t dma_handle, size_t size,
 378                 enum dma_data_direction direction)
 379 {
 380         BUG_ON(direction == DMA_NONE);
 381         __dma_sync(bus_to_virt(dma_handle), size, direction);
 382 }
 383
 384 static inline void dma_sync_single_for_device(struct device *dev,
 385                 dma_addr_t dma_handle, size_t size,
 386                 enum dma_data_direction direction)
 387 {
 388         BUG_ON(direction == DMA_NONE);
 389         __dma_sync(bus_to_virt(dma_handle), size, direction);
 390 }
 391
 392 static inline void dma_sync_sg_for_cpu(struct device *dev,
 393                 struct scatterlist *sgl, int nents,
 394                 enum dma_data_direction direction)
 395 {
 396         struct scatterlist *sg;
 397         int i;
 398
 399         BUG_ON(direction == DMA_NONE);
 400
 401         for_each_sg(sgl, sg, nents, i)
 402                 __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
 403 }
 404
 405 static inline void dma_sync_sg_for_device(struct device *dev,
 406                 struct scatterlist *sgl, int nents,
 407                 enum dma_data_direction direction)
 408 {
 409         struct scatterlist *sg;
 410         int i;
 411
 412         BUG_ON(direction == DMA_NONE);
 413
 414         for_each_sg(sgl, sg, nents, i)
 415                 __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
 416 }
 417
 418 static inline int dma_mapping_error(dma_addr_t dma_addr)
 419 {
 420 #ifdef CONFIG_PPC64
 421         return (dma_addr == DMA_ERROR_CODE);
 422 #else
 423         return 0;
 424 #endif
 425 }
 426
 427 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 428 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 429 #ifdef CONFIG_NOT_COHERENT_CACHE
 430 #define dma_is_consistent(d, h) (0)
 431 #else
 432 #define dma_is_consistent(d, h) (1)
 433 #endif
 434
 435 static inline int dma_get_cache_alignment(void)
 436 {
 437 #ifdef CONFIG_PPC64
 438         /* no easy way to get cache size on all processors, so return
 439          * the maximum possible, to be safe */
 440         return (1 << INTERNODE_CACHE_SHIFT);
 441 #else
 442         /*
 443          * Each processor family will define its own L1_CACHE_SHIFT,
 444          * L1_CACHE_BYTES wraps to this, so this is always safe.
 445          */
 446         return L1_CACHE_BYTES;
 447 #endif
 448 }
 449
 450 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 451                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 452                 enum dma_data_direction direction)
 453 {
 454         /* just sync everything for now */
 455         dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
 456 }
 457
 458 static inline void dma_sync_single_range_for_device(struct device *dev,
 459                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 460                 enum dma_data_direction direction)
 461 {
 462         /* just sync everything for now */
 463         dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
 464 }
 465
 466 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 467                 enum dma_data_direction direction)
 468 {
 469         BUG_ON(direction == DMA_NONE);
 470         __dma_sync(vaddr, size, (int)direction);
 471 }
 472
 473 #endif /* __KERNEL__ */
 474 #endif  /* _ASM_DMA_MAPPING_H */