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         int             (*addr_needs_map)(struct device *dev, dma_addr_t addr,
  91                                 size_t size);
  92 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
  93         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  94                                 dma_addr_t dma_handle, unsigned long offset,
  95                                 size_t size,
  96                                 enum dma_data_direction direction);
  97         void            (*sync_single_range_for_device)(struct device *hwdev,
  98                                 dma_addr_t dma_handle, unsigned long offset,
  99                                 size_t size,
 100                                 enum dma_data_direction direction);
 101         void            (*sync_sg_for_cpu)(struct device *hwdev,
 102                                 struct scatterlist *sg, int nelems,
 103                                 enum dma_data_direction direction);
 104         void            (*sync_sg_for_device)(struct device *hwdev,
 105                                 struct scatterlist *sg, int nelems,
 106                                 enum dma_data_direction direction);
 107 #endif
 108 };
 109
 110 /*
 111  * Available generic sets of operations
 112  */
 113 #ifdef CONFIG_PPC64
 114 extern struct dma_mapping_ops dma_iommu_ops;
 115 #endif
 116 extern struct dma_mapping_ops dma_direct_ops;
 117
 118 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
 119 {
 120         /* We don't handle the NULL dev case for ISA for now. We could
 121          * do it via an out of line call but it is not needed for now. The
 122          * only ISA DMA device we support is the floppy and we have a hack
 123          * in the floppy driver directly to get a device for us.
 124          */
 125         if (unlikely(dev == NULL))
 126                 return NULL;
 127
 128         return dev->archdata.dma_ops;
 129 }
 130
 131 static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
 132 {
 133         dev->archdata.dma_ops = ops;
 134 }
 135
 136 static inline int dma_supported(struct device *dev, u64 mask)
 137 {
 138         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 139
 140         if (unlikely(dma_ops == NULL))
 141                 return 0;
 142         if (dma_ops->dma_supported == NULL)
 143                 return 1;
 144         return dma_ops->dma_supported(dev, mask);
 145 }
 146
 147 /* We have our own implementation of pci_set_dma_mask() */
 148 #define HAVE_ARCH_PCI_SET_DMA_MASK
 149
 150 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 151 {
 152         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 153
 154         if (unlikely(dma_ops == NULL))
 155                 return -EIO;
 156         if (dma_ops->set_dma_mask != NULL)
 157                 return dma_ops->set_dma_mask(dev, dma_mask);
 158         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 159                 return -EIO;
 160         *dev->dma_mask = dma_mask;
 161         return 0;
 162 }
 163
 164 /*
 165  * map_/unmap_single actually call through to map/unmap_page now that all the
 166  * dma_mapping_ops have been converted over. We just have to get the page and
 167  * offset to pass through to map_page
 168  */
 169 static inline dma_addr_t dma_map_single_attrs(struct device *dev,
 170                                               void *cpu_addr,
 171                                               size_t size,
 172                                               enum dma_data_direction direction,
 173                                               struct dma_attrs *attrs)
 174 {
 175         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 176
 177         BUG_ON(!dma_ops);
 178
 179         return dma_ops->map_page(dev, virt_to_page(cpu_addr),
 180                                  (unsigned long)cpu_addr % PAGE_SIZE, size,
 181                                  direction, attrs);
 182 }
 183
 184 static inline void dma_unmap_single_attrs(struct device *dev,
 185                                           dma_addr_t dma_addr,
 186                                           size_t size,
 187                                           enum dma_data_direction direction,
 188                                           struct dma_attrs *attrs)
 189 {
 190         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 191
 192         BUG_ON(!dma_ops);
 193
 194         dma_ops->unmap_page(dev, dma_addr, size, direction, attrs);
 195 }
 196
 197 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 198                                             struct page *page,
 199                                             unsigned long offset, size_t size,
 200                                             enum dma_data_direction direction,
 201                                             struct dma_attrs *attrs)
 202 {
 203         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 204
 205         BUG_ON(!dma_ops);
 206
 207         return dma_ops->map_page(dev, page, offset, size, direction, attrs);
 208 }
 209
 210 static inline void dma_unmap_page_attrs(struct device *dev,
 211                                         dma_addr_t dma_address,
 212                                         size_t size,
 213                                         enum dma_data_direction direction,
 214                                         struct dma_attrs *attrs)
 215 {
 216         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 217
 218         BUG_ON(!dma_ops);
 219
 220         dma_ops->unmap_page(dev, dma_address, size, direction, attrs);
 221 }
 222
 223 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 224                                    int nents, enum dma_data_direction direction,
 225                                    struct dma_attrs *attrs)
 226 {
 227         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 228
 229         BUG_ON(!dma_ops);
 230         return dma_ops->map_sg(dev, sg, nents, direction, attrs);
 231 }
 232
 233 static inline void dma_unmap_sg_attrs(struct device *dev,
 234                                       struct scatterlist *sg,
 235                                       int nhwentries,
 236                                       enum dma_data_direction direction,
 237                                       struct dma_attrs *attrs)
 238 {
 239         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 240
 241         BUG_ON(!dma_ops);
 242         dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
 243 }
 244
 245 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 246                                        dma_addr_t *dma_handle, gfp_t flag)
 247 {
 248         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 249
 250         BUG_ON(!dma_ops);
 251         return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
 252 }
 253
 254 static inline void dma_free_coherent(struct device *dev, size_t size,
 255                                      void *cpu_addr, dma_addr_t dma_handle)
 256 {
 257         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 258
 259         BUG_ON(!dma_ops);
 260         dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
 261 }
 262
 263 static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
 264                                         size_t size,
 265                                         enum dma_data_direction direction)
 266 {
 267         return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
 268 }
 269
 270 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 271                                     size_t size,
 272                                     enum dma_data_direction direction)
 273 {
 274         dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
 275 }
 276
 277 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 278                                       unsigned long offset, size_t size,
 279                                       enum dma_data_direction direction)
 280 {
 281         return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
 282 }
 283
 284 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 285                                   size_t size,
 286                                   enum dma_data_direction direction)
 287 {
 288         dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
 289 }
 290
 291 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
 292                              int nents, enum dma_data_direction direction)
 293 {
 294         return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
 295 }
 296
 297 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 298                                 int nhwentries,
 299                                 enum dma_data_direction direction)
 300 {
 301         dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
 302 }
 303
 304 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
 305 static inline void dma_sync_single_for_cpu(struct device *dev,
 306                 dma_addr_t dma_handle, size_t size,
 307                 enum dma_data_direction direction)
 308 {
 309         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 310
 311         BUG_ON(!dma_ops);
 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         dma_ops->sync_single_range_for_device(dev, dma_handle,
 324                                               0, size, direction);
 325 }
 326
 327 static inline void dma_sync_sg_for_cpu(struct device *dev,
 328                 struct scatterlist *sgl, int nents,
 329                 enum dma_data_direction direction)
 330 {
 331         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 332
 333         BUG_ON(!dma_ops);
 334         dma_ops->sync_sg_for_cpu(dev, sgl, nents, direction);
 335 }
 336
 337 static inline void dma_sync_sg_for_device(struct device *dev,
 338                 struct scatterlist *sgl, int nents,
 339                 enum dma_data_direction direction)
 340 {
 341         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 342
 343         BUG_ON(!dma_ops);
 344         dma_ops->sync_sg_for_device(dev, sgl, nents, direction);
 345 }
 346
 347 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 348                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 349                 enum dma_data_direction direction)
 350 {
 351         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 352
 353         BUG_ON(!dma_ops);
 354         dma_ops->sync_single_range_for_cpu(dev, dma_handle,
 355                                            offset, size, direction);
 356 }
 357
 358 static inline void dma_sync_single_range_for_device(struct device *dev,
 359                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 360                 enum dma_data_direction direction)
 361 {
 362         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 363
 364         BUG_ON(!dma_ops);
 365         dma_ops->sync_single_range_for_device(dev, dma_handle, offset,
 366                                               size, direction);
 367 }
 368 #else /* CONFIG_PPC_NEED_DMA_SYNC_OPS */
 369 static inline void dma_sync_single_for_cpu(struct device *dev,
 370                 dma_addr_t dma_handle, size_t size,
 371                 enum dma_data_direction direction)
 372 {
 373 }
 374
 375 static inline void dma_sync_single_for_device(struct device *dev,
 376                 dma_addr_t dma_handle, size_t size,
 377                 enum dma_data_direction direction)
 378 {
 379 }
 380
 381 static inline void dma_sync_sg_for_cpu(struct device *dev,
 382                 struct scatterlist *sgl, int nents,
 383                 enum dma_data_direction direction)
 384 {
 385 }
 386
 387 static inline void dma_sync_sg_for_device(struct device *dev,
 388                 struct scatterlist *sgl, int nents,
 389                 enum dma_data_direction direction)
 390 {
 391 }
 392
 393 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 394                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 395                 enum dma_data_direction direction)
 396 {
 397 }
 398
 399 static inline void dma_sync_single_range_for_device(struct device *dev,
 400                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 401                 enum dma_data_direction direction)
 402 {
 403 }
 404 #endif
 405
 406 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 407 {
 408 #ifdef CONFIG_PPC64
 409         return (dma_addr == DMA_ERROR_CODE);
 410 #else
 411         return 0;
 412 #endif
 413 }
 414
 415 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 416 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 417 #ifdef CONFIG_NOT_COHERENT_CACHE
 418 #define dma_is_consistent(d, h) (0)
 419 #else
 420 #define dma_is_consistent(d, h) (1)
 421 #endif
 422
 423 static inline int dma_get_cache_alignment(void)
 424 {
 425 #ifdef CONFIG_PPC64
 426         /* no easy way to get cache size on all processors, so return
 427          * the maximum possible, to be safe */
 428         return (1 << INTERNODE_CACHE_SHIFT);
 429 #else
 430         /*
 431          * Each processor family will define its own L1_CACHE_SHIFT,
 432          * L1_CACHE_BYTES wraps to this, so this is always safe.
 433          */
 434         return L1_CACHE_BYTES;
 435 #endif
 436 }
 437
 438 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 439                 enum dma_data_direction direction)
 440 {
 441         BUG_ON(direction == DMA_NONE);
 442         __dma_sync(vaddr, size, (int)direction);
 443 }
 444
 445 #endif /* __KERNEL__ */
 446 #endif  /* _ASM_DMA_MAPPING_H */