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
  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 static inline unsigned long device_to_mask(struct device *dev)
  48 {
  49         if (dev->dma_mask && *dev->dma_mask)
  50                 return *dev->dma_mask;
  51         /* Assume devices without mask can take 32 bit addresses */
  52         return 0xfffffffful;
  53 }
  54
  55 /*
  56  * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
  57  */
  58 struct dma_mapping_ops {
  59         void *          (*alloc_coherent)(struct device *dev, size_t size,
  60                                 dma_addr_t *dma_handle, gfp_t flag);
  61         void            (*free_coherent)(struct device *dev, size_t size,
  62                                 void *vaddr, dma_addr_t dma_handle);
  63         int             (*map_sg)(struct device *dev, struct scatterlist *sg,
  64                                 int nents, enum dma_data_direction direction,
  65                                 struct dma_attrs *attrs);
  66         void            (*unmap_sg)(struct device *dev, struct scatterlist *sg,
  67                                 int nents, enum dma_data_direction direction,
  68                                 struct dma_attrs *attrs);
  69         int             (*dma_supported)(struct device *dev, u64 mask);
  70         int             (*set_dma_mask)(struct device *dev, u64 dma_mask);
  71         dma_addr_t      (*map_page)(struct device *dev, struct page *page,
  72                                 unsigned long offset, size_t size,
  73                                 enum dma_data_direction direction,
  74                                 struct dma_attrs *attrs);
  75         void            (*unmap_page)(struct device *dev,
  76                                 dma_addr_t dma_address, size_t size,
  77                                 enum dma_data_direction direction,
  78                                 struct dma_attrs *attrs);
  79 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
  80         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  81                                 dma_addr_t dma_handle, unsigned long offset,
  82                                 size_t size,
  83                                 enum dma_data_direction direction);
  84         void            (*sync_single_range_for_device)(struct device *hwdev,
  85                                 dma_addr_t dma_handle, unsigned long offset,
  86                                 size_t size,
  87                                 enum dma_data_direction direction);
  88         void            (*sync_sg_for_cpu)(struct device *hwdev,
  89                                 struct scatterlist *sg, int nelems,
  90                                 enum dma_data_direction direction);
  91         void            (*sync_sg_for_device)(struct device *hwdev,
  92                                 struct scatterlist *sg, int nelems,
  93                                 enum dma_data_direction direction);
  94 #endif
  95 };
  96
  97 /*
  98  * Available generic sets of operations
  99  */
 100 #ifdef CONFIG_PPC64
 101 extern struct dma_mapping_ops dma_iommu_ops;
 102 #endif
 103 extern struct dma_mapping_ops dma_direct_ops;
 104
 105 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
 106 {
 107         /* We don't handle the NULL dev case for ISA for now. We could
 108          * do it via an out of line call but it is not needed for now. The
 109          * only ISA DMA device we support is the floppy and we have a hack
 110          * in the floppy driver directly to get a device for us.
 111          */
 112         if (unlikely(dev == NULL))
 113                 return NULL;
 114
 115         return dev->archdata.dma_ops;
 116 }
 117
 118 static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
 119 {
 120         dev->archdata.dma_ops = ops;
 121 }
 122
 123 static inline int dma_supported(struct device *dev, u64 mask)
 124 {
 125         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 126
 127         if (unlikely(dma_ops == NULL))
 128                 return 0;
 129         if (dma_ops->dma_supported == NULL)
 130                 return 1;
 131         return dma_ops->dma_supported(dev, mask);
 132 }
 133
 134 /* We have our own implementation of pci_set_dma_mask() */
 135 #define HAVE_ARCH_PCI_SET_DMA_MASK
 136
 137 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 138 {
 139         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 140
 141         if (unlikely(dma_ops == NULL))
 142                 return -EIO;
 143         if (dma_ops->set_dma_mask != NULL)
 144                 return dma_ops->set_dma_mask(dev, dma_mask);
 145         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 146                 return -EIO;
 147         *dev->dma_mask = dma_mask;
 148         return 0;
 149 }
 150
 151 /*
 152  * map_/unmap_single actually call through to map/unmap_page now that all the
 153  * dma_mapping_ops have been converted over. We just have to get the page and
 154  * offset to pass through to map_page
 155  */
 156 static inline dma_addr_t dma_map_single_attrs(struct device *dev,
 157                                               void *cpu_addr,
 158                                               size_t size,
 159                                               enum dma_data_direction direction,
 160                                               struct dma_attrs *attrs)
 161 {
 162         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 163
 164         BUG_ON(!dma_ops);
 165
 166         return dma_ops->map_page(dev, virt_to_page(cpu_addr),
 167                                  (unsigned long)cpu_addr % PAGE_SIZE, size,
 168                                  direction, attrs);
 169 }
 170
 171 static inline void dma_unmap_single_attrs(struct device *dev,
 172                                           dma_addr_t dma_addr,
 173                                           size_t size,
 174                                           enum dma_data_direction direction,
 175                                           struct dma_attrs *attrs)
 176 {
 177         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 178
 179         BUG_ON(!dma_ops);
 180
 181         dma_ops->unmap_page(dev, dma_addr, size, direction, attrs);
 182 }
 183
 184 static inline dma_addr_t dma_map_page_attrs(struct device *dev,
 185                                             struct page *page,
 186                                             unsigned long offset, 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         return dma_ops->map_page(dev, page, offset, size, direction, attrs);
 195 }
 196
 197 static inline void dma_unmap_page_attrs(struct device *dev,
 198                                         dma_addr_t dma_address,
 199                                         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         dma_ops->unmap_page(dev, dma_address, size, direction, attrs);
 208 }
 209
 210 static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 211                                    int nents, 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         return dma_ops->map_sg(dev, sg, nents, direction, attrs);
 218 }
 219
 220 static inline void dma_unmap_sg_attrs(struct device *dev,
 221                                       struct scatterlist *sg,
 222                                       int nhwentries,
 223                                       enum dma_data_direction direction,
 224                                       struct dma_attrs *attrs)
 225 {
 226         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 227
 228         BUG_ON(!dma_ops);
 229         dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
 230 }
 231
 232 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 233                                        dma_addr_t *dma_handle, gfp_t flag)
 234 {
 235         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 236
 237         BUG_ON(!dma_ops);
 238         return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
 239 }
 240
 241 static inline void dma_free_coherent(struct device *dev, size_t size,
 242                                      void *cpu_addr, dma_addr_t dma_handle)
 243 {
 244         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 245
 246         BUG_ON(!dma_ops);
 247         dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
 248 }
 249
 250 static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
 251                                         size_t size,
 252                                         enum dma_data_direction direction)
 253 {
 254         return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
 255 }
 256
 257 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 258                                     size_t size,
 259                                     enum dma_data_direction direction)
 260 {
 261         dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
 262 }
 263
 264 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 265                                       unsigned long offset, size_t size,
 266                                       enum dma_data_direction direction)
 267 {
 268         return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
 269 }
 270
 271 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 272                                   size_t size,
 273                                   enum dma_data_direction direction)
 274 {
 275         dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
 276 }
 277
 278 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
 279                              int nents, enum dma_data_direction direction)
 280 {
 281         return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
 282 }
 283
 284 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 285                                 int nhwentries,
 286                                 enum dma_data_direction direction)
 287 {
 288         dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
 289 }
 290
 291 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
 292 static inline void dma_sync_single_for_cpu(struct device *dev,
 293                 dma_addr_t dma_handle, size_t size,
 294                 enum dma_data_direction direction)
 295 {
 296         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 297
 298         BUG_ON(!dma_ops);
 299         dma_ops->sync_single_range_for_cpu(dev, dma_handle, 0,
 300                                            size, direction);
 301 }
 302
 303 static inline void dma_sync_single_for_device(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         dma_ops->sync_single_range_for_device(dev, dma_handle,
 311                                               0, size, direction);
 312 }
 313
 314 static inline void dma_sync_sg_for_cpu(struct device *dev,
 315                 struct scatterlist *sgl, int nents,
 316                 enum dma_data_direction direction)
 317 {
 318         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 319
 320         BUG_ON(!dma_ops);
 321         dma_ops->sync_sg_for_cpu(dev, sgl, nents, direction);
 322 }
 323
 324 static inline void dma_sync_sg_for_device(struct device *dev,
 325                 struct scatterlist *sgl, int nents,
 326                 enum dma_data_direction direction)
 327 {
 328         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 329
 330         BUG_ON(!dma_ops);
 331         dma_ops->sync_sg_for_device(dev, sgl, nents, direction);
 332 }
 333
 334 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 335                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 336                 enum dma_data_direction direction)
 337 {
 338         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 339
 340         BUG_ON(!dma_ops);
 341         dma_ops->sync_single_range_for_cpu(dev, dma_handle,
 342                                            offset, size, direction);
 343 }
 344
 345 static inline void dma_sync_single_range_for_device(struct device *dev,
 346                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 347                 enum dma_data_direction direction)
 348 {
 349         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 350
 351         BUG_ON(!dma_ops);
 352         dma_ops->sync_single_range_for_device(dev, dma_handle, offset,
 353                                               size, direction);
 354 }
 355 #else /* CONFIG_PPC_NEED_DMA_SYNC_OPS */
 356 static inline void dma_sync_single_for_cpu(struct device *dev,
 357                 dma_addr_t dma_handle, size_t size,
 358                 enum dma_data_direction direction)
 359 {
 360 }
 361
 362 static inline void dma_sync_single_for_device(struct device *dev,
 363                 dma_addr_t dma_handle, size_t size,
 364                 enum dma_data_direction direction)
 365 {
 366 }
 367
 368 static inline void dma_sync_sg_for_cpu(struct device *dev,
 369                 struct scatterlist *sgl, int nents,
 370                 enum dma_data_direction direction)
 371 {
 372 }
 373
 374 static inline void dma_sync_sg_for_device(struct device *dev,
 375                 struct scatterlist *sgl, int nents,
 376                 enum dma_data_direction direction)
 377 {
 378 }
 379
 380 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 381                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 382                 enum dma_data_direction direction)
 383 {
 384 }
 385
 386 static inline void dma_sync_single_range_for_device(struct device *dev,
 387                 dma_addr_t dma_handle, unsigned long offset, size_t size,
 388                 enum dma_data_direction direction)
 389 {
 390 }
 391 #endif
 392
 393 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 394 {
 395 #ifdef CONFIG_PPC64
 396         return (dma_addr == DMA_ERROR_CODE);
 397 #else
 398         return 0;
 399 #endif
 400 }
 401
 402 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 403 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 404 #ifdef CONFIG_NOT_COHERENT_CACHE
 405 #define dma_is_consistent(d, h) (0)
 406 #else
 407 #define dma_is_consistent(d, h) (1)
 408 #endif
 409
 410 static inline int dma_get_cache_alignment(void)
 411 {
 412 #ifdef CONFIG_PPC64
 413         /* no easy way to get cache size on all processors, so return
 414          * the maximum possible, to be safe */
 415         return (1 << INTERNODE_CACHE_SHIFT);
 416 #else
 417         /*
 418          * Each processor family will define its own L1_CACHE_SHIFT,
 419          * L1_CACHE_BYTES wraps to this, so this is always safe.
 420          */
 421         return L1_CACHE_BYTES;
 422 #endif
 423 }
 424
 425 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 426                 enum dma_data_direction direction)
 427 {
 428         BUG_ON(direction == DMA_NONE);
 429         __dma_sync(vaddr, size, (int)direction);
 430 }
 431
 432 #endif /* __KERNEL__ */
 433 #endif  /* _ASM_DMA_MAPPING_H */