arch/powerpc/include/asm/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 #include <asm/swiotlb.h>
  19
  20 #define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
  21
  22 /* Some dma direct funcs must be visible for use in other dma_ops */
  23 extern void *dma_direct_alloc_coherent(struct device *dev, size_t size,
  24                                        dma_addr_t *dma_handle, gfp_t flag);
  25 extern void dma_direct_free_coherent(struct device *dev, size_t size,
  26                                      void *vaddr, dma_addr_t dma_handle);
  27
  28 extern unsigned long get_dma_direct_offset(struct device *dev);
  29
  30 #ifdef CONFIG_NOT_COHERENT_CACHE
  31 /*
  32  * DMA-consistent mapping functions for PowerPCs that don't support
  33  * cache snooping.  These allocate/free a region of uncached mapped
  34  * memory space for use with DMA devices.  Alternatively, you could
  35  * allocate the space "normally" and use the cache management functions
  36  * to ensure it is consistent.
  37  */
  38 struct device;
  39 extern void *__dma_alloc_coherent(struct device *dev, size_t size,
  40                                   dma_addr_t *handle, gfp_t gfp);
  41 extern void __dma_free_coherent(size_t size, void *vaddr);
  42 extern void __dma_sync(void *vaddr, size_t size, int direction);
  43 extern void __dma_sync_page(struct page *page, unsigned long offset,
  44                                  size_t size, int direction);
  45
  46 #else /* ! CONFIG_NOT_COHERENT_CACHE */
  47 /*
  48  * Cache coherent cores.
  49  */
  50
  51 #define __dma_alloc_coherent(dev, gfp, size, handle)    NULL
  52 #define __dma_free_coherent(size, addr)         ((void)0)
  53 #define __dma_sync(addr, size, rw)              ((void)0)
  54 #define __dma_sync_page(pg, off, sz, rw)        ((void)0)
  55
  56 #endif /* ! CONFIG_NOT_COHERENT_CACHE */
  57
  58 static inline unsigned long device_to_mask(struct device *dev)
  59 {
  60         if (dev->dma_mask && *dev->dma_mask)
  61                 return *dev->dma_mask;
  62         /* Assume devices without mask can take 32 bit addresses */
  63         return 0xfffffffful;
  64 }
  65
  66 /*
  67  * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
  68  */
  69 struct dma_mapping_ops {
  70         void *          (*alloc_coherent)(struct device *dev, size_t size,
  71                                 dma_addr_t *dma_handle, gfp_t flag);
  72         void            (*free_coherent)(struct device *dev, size_t size,
  73                                 void *vaddr, dma_addr_t dma_handle);
  74         int             (*map_sg)(struct device *dev, struct scatterlist *sg,
  75                                 int nents, enum dma_data_direction direction,
  76                                 struct dma_attrs *attrs);
  77         void            (*unmap_sg)(struct device *dev, struct scatterlist *sg,
  78                                 int nents, enum dma_data_direction direction,
  79                                 struct dma_attrs *attrs);
  80         int             (*dma_supported)(struct device *dev, u64 mask);
  81         int             (*set_dma_mask)(struct device *dev, u64 dma_mask);
  82         dma_addr_t      (*map_page)(struct device *dev, struct page *page,
  83                                 unsigned long offset, size_t size,
  84                                 enum dma_data_direction direction,
  85                                 struct dma_attrs *attrs);
  86         void            (*unmap_page)(struct device *dev,
  87                                 dma_addr_t dma_address, size_t size,
  88                                 enum dma_data_direction direction,
  89                                 struct dma_attrs *attrs);
  90 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
  91         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  92                                 dma_addr_t dma_handle, unsigned long offset,
  93                                 size_t size,
  94                                 enum dma_data_direction direction);
  95         void            (*sync_single_range_for_device)(struct device *hwdev,
  96                                 dma_addr_t dma_handle, unsigned long offset,
  97                                 size_t size,
  98                                 enum dma_data_direction direction);
  99         void            (*sync_sg_for_cpu)(struct device *hwdev,
 100                                 struct scatterlist *sg, int nelems,
 101                                 enum dma_data_direction direction);
 102         void            (*sync_sg_for_device)(struct device *hwdev,
 103                                 struct scatterlist *sg, int nelems,
 104                                 enum dma_data_direction direction);
 105 #endif
 106 };
 107
 108 /*
 109  * Available generic sets of operations
 110  */
 111 #ifdef CONFIG_PPC64
 112 extern struct dma_mapping_ops dma_iommu_ops;
 113 #endif
 114 extern struct dma_mapping_ops dma_direct_ops;
 115
 116 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
 117 {
 118         /* We don't handle the NULL dev case for ISA for now. We could
 119          * do it via an out of line call but it is not needed for now. The
 120          * only ISA DMA device we support is the floppy and we have a hack
 121          * in the floppy driver directly to get a device for us.
 122          */
 123         if (unlikely(dev == NULL))
 124                 return NULL;
 125
 126         return dev->archdata.dma_ops;
 127 }
 128
 129 static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
 130 {
 131         dev->archdata.dma_ops = ops;
 132 }
 133
 134 static inline int dma_supported(struct device *dev, u64 mask)
 135 {
 136         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 137
 138         if (unlikely(dma_ops == NULL))
 139                 return 0;
 140         if (dma_ops->dma_supported == NULL)
 141                 return 1;
 142         return dma_ops->dma_supported(dev, mask);
 143 }
 144
 145 /* We have our own implementation of pci_set_dma_mask() */
 146 #define HAVE_ARCH_PCI_SET_DMA_MASK
 147
 148 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 149 {
 150         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 151
 152         if (unlikely(dma_ops == NULL))
 153                 return -EIO;
 154         if (dma_ops->set_dma_mask != NULL)
 155                 return dma_ops->set_dma_mask(dev, dma_mask);
 156         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 157                 return -EIO;
 158         *dev->dma_mask = dma_mask;
 159         return 0;
 160 }
 161
 162 /*
 163  * map_/unmap_single actually call through to map/unmap_page now that all the
 164  * dma_mapping_ops have been converted over. We just have to get the page and
 165  * offset to pass through to map_page
 166  */
 167 static inline dma_addr_t dma_map_single_attrs(struct device *dev,
 168                                               void *cpu_addr,
 169                                               size_t size,
 170                                               enum dma_data_direction direction,
 171                                               struct dma_attrs *attrs)
 172 {
 173         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 174
 175         BUG_ON(!dma_ops);
 176
 177         return dma_ops->map_page(dev, virt_to_page(cpu_addr),
 178                                  (unsigned long)cpu_addr % PAGE_SIZE, size,
 179                                  direction, attrs);
 180 }
 181
 182 static inline void dma_unmap_single_attrs(struct device *dev,
 183                                           dma_addr_t dma_addr,
 184                                           size_t size,
 185                                           enum dma_data_direction direction,
 186                                           struct dma_attrs *attrs)
 187 {
 188         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 189
 190         BUG_ON(!dma_ops);
 191
 192         dma_ops->unmap_page(dev, dma_addr, size, direction, attrs);
 193 }
 194
 195 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 196                                             struct page *page,
 197                                             unsigned long offset, size_t size,
 198                                             enum dma_data_direction direction,
 199                                             struct dma_attrs *attrs)
 200 {
 201         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 202
 203         BUG_ON(!dma_ops);
 204
 205         return dma_ops->map_page(dev, page, offset, size, direction, attrs);
 206 }
 207
 208 static inline void dma_unmap_page_attrs(struct device *dev,
 209                                         dma_addr_t dma_address,
 210                                         size_t size,
 211                                         enum dma_data_direction direction,
 212                                         struct dma_attrs *attrs)
 213 {
 214         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 215
 216         BUG_ON(!dma_ops);
 217
 218         dma_ops->unmap_page(dev, dma_address, size, direction, attrs);
 219 }
 220
 221 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 222                                    int nents, enum dma_data_direction direction,
 223                                    struct dma_attrs *attrs)
 224 {
 225         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 226
 227         BUG_ON(!dma_ops);
 228         return dma_ops->map_sg(dev, sg, nents, direction, attrs);
 229 }
 230
 231 static inline void dma_unmap_sg_attrs(struct device *dev,
 232                                       struct scatterlist *sg,
 233                                       int nhwentries,
 234                                       enum dma_data_direction direction,
 235                                       struct dma_attrs *attrs)
 236 {
 237         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 238
 239         BUG_ON(!dma_ops);
 240         dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
 241 }
 242
 243 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 244                                        dma_addr_t *dma_handle, gfp_t flag)
 245 {
 246         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 247
 248         BUG_ON(!dma_ops);
 249         return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
 250 }
 251
 252 static inline void dma_free_coherent(struct device *dev, size_t size,
 253                                      void *cpu_addr, dma_addr_t dma_handle)
 254 {
 255         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 256
 257         BUG_ON(!dma_ops);
 258         dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
 259 }
 260
 261 static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
 262                                         size_t size,
 263                                         enum dma_data_direction direction)
 264 {
 265         return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
 266 }
 267
 268 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 269                                     size_t size,
 270                                     enum dma_data_direction direction)
 271 {
 272         dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
 273 }
 274
 275 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 276                                       unsigned long offset, size_t size,
 277                                       enum dma_data_direction direction)
 278 {
 279         return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
 280 }
 281
 282 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 283                                   size_t size,
 284                                   enum dma_data_direction direction)
 285 {
 286         dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
 287 }
 288
 289 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
 290                              int nents, enum dma_data_direction direction)
 291 {
 292         return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
 293 }
 294
 295 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 296                                 int nhwentries,
 297                                 enum dma_data_direction direction)
 298 {
 299         dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
 300 }
 301
 302 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
 303 static inline void dma_sync_single_for_cpu(struct device *dev,
 304                 dma_addr_t dma_handle, size_t size,
 305                 enum dma_data_direction direction)
 306 {
 307         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 308
 309         BUG_ON(!dma_ops);
 310
 311         if (dma_ops->sync_single_range_for_cpu)
 312                 dma_ops->sync_single_range_for_cpu(dev, dma_handle, 0,
 313                                            size, direction);
 314 }
 315
 316 static inline void dma_sync_single_for_device(struct device *dev,
 317                 dma_addr_t dma_handle, size_t size,
 318                 enum dma_data_direction direction)
 319 {
 320         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 321
 322         BUG_ON(!dma_ops);
 323
 324         if (dma_ops->sync_single_range_for_device)
 325                 dma_ops->sync_single_range_for_device(dev, dma_handle,
 326                                               0, size, direction);
 327 }
 328
 329 static inline void dma_sync_sg_for_cpu(struct device *dev,
 330                 struct scatterlist *sgl, int nents,
 331                 enum dma_data_direction direction)
 332 {
 333         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 334
 335         BUG_ON(!dma_ops);
 336
 337         if (dma_ops->sync_sg_for_cpu)
 338                 dma_ops->sync_sg_for_cpu(dev, sgl, nents, direction);
 339 }
 340
 341 static inline void dma_sync_sg_for_device(struct device *dev,
 342                 struct scatterlist *sgl, int nents,
 343                 enum dma_data_direction direction)
 344 {
 345         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 346
 347         BUG_ON(!dma_ops);
 348
 349         if (dma_ops->sync_sg_for_device)
 350                 dma_ops->sync_sg_for_device(dev, sgl, nents, direction);
 351 }
 352
 353 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 354                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 355                 enum dma_data_direction direction)
 356 {
 357         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 358
 359         BUG_ON(!dma_ops);
 360
 361         if (dma_ops->sync_single_range_for_cpu)
 362                 dma_ops->sync_single_range_for_cpu(dev, dma_handle,
 363                                            offset, size, direction);
 364 }
 365
 366 static inline void dma_sync_single_range_for_device(struct device *dev,
 367                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 368                 enum dma_data_direction direction)
 369 {
 370         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 371
 372         BUG_ON(!dma_ops);
 373
 374         if (dma_ops->sync_single_range_for_device)
 375                 dma_ops->sync_single_range_for_device(dev, dma_handle, offset,
 376                                               size, direction);
 377 }
 378 #else /* CONFIG_PPC_NEED_DMA_SYNC_OPS */
 379 static inline void dma_sync_single_for_cpu(struct device *dev,
 380                 dma_addr_t dma_handle, size_t size,
 381                 enum dma_data_direction direction)
 382 {
 383 }
 384
 385 static inline void dma_sync_single_for_device(struct device *dev,
 386                 dma_addr_t dma_handle, size_t size,
 387                 enum dma_data_direction direction)
 388 {
 389 }
 390
 391 static inline void dma_sync_sg_for_cpu(struct device *dev,
 392                 struct scatterlist *sgl, int nents,
 393                 enum dma_data_direction direction)
 394 {
 395 }
 396
 397 static inline void dma_sync_sg_for_device(struct device *dev,
 398                 struct scatterlist *sgl, int nents,
 399                 enum dma_data_direction direction)
 400 {
 401 }
 402
 403 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 404                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 405                 enum dma_data_direction direction)
 406 {
 407 }
 408
 409 static inline void dma_sync_single_range_for_device(struct device *dev,
 410                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 411                 enum dma_data_direction direction)
 412 {
 413 }
 414 #endif
 415
 416 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 417 {
 418 #ifdef CONFIG_PPC64
 419         return (dma_addr == DMA_ERROR_CODE);
 420 #else
 421         return 0;
 422 #endif
 423 }
 424
 425 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 426 {
 427 #ifdef CONFIG_SWIOTLB
 428         struct dev_archdata *sd = &dev->archdata;
 429
 430         if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
 431                 return 0;
 432 #endif
 433
 434         if (!dev->dma_mask)
 435                 return 0;
 436
 437         return addr + size <= *dev->dma_mask;
 438 }
 439
 440 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 441 {
 442         return paddr + get_dma_direct_offset(dev);
 443 }
 444
 445 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 446 {
 447         return daddr - get_dma_direct_offset(dev);
 448 }
 449
 450 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 451 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 452 #ifdef CONFIG_NOT_COHERENT_CACHE
 453 #define dma_is_consistent(d, h) (0)
 454 #else
 455 #define dma_is_consistent(d, h) (1)
 456 #endif
 457
 458 static inline int dma_get_cache_alignment(void)
 459 {
 460 #ifdef CONFIG_PPC64
 461         /* no easy way to get cache size on all processors, so return
 462          * the maximum possible, to be safe */
 463         return (1 << INTERNODE_CACHE_SHIFT);
 464 #else
 465         /*
 466          * Each processor family will define its own L1_CACHE_SHIFT,
 467          * L1_CACHE_BYTES wraps to this, so this is always safe.
 468          */
 469         return L1_CACHE_BYTES;
 470 #endif
 471 }
 472
 473 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 474                 enum dma_data_direction direction)
 475 {
 476         BUG_ON(direction == DMA_NONE);
 477         __dma_sync(vaddr, size, (int)direction);
 478 }
 479
 480 #endif /* __KERNEL__ */
 481 #endif  /* _ASM_DMA_MAPPING_H */