arch/blackfin/include/asm/dma-mapping.h

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later.
   5  */
   6
   7 #ifndef _BLACKFIN_DMA_MAPPING_H
   8 #define _BLACKFIN_DMA_MAPPING_H
   9
  10 #include <asm/cacheflush.h>
  11
  12 extern void
  13 __dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
  14 static inline void
  15 __dma_sync_inline(dma_addr_t addr, size_t size, enum dma_data_direction dir)
  16 {
  17         switch (dir) {
  18         case DMA_NONE:
  19                 BUG();
  20         case DMA_TO_DEVICE:             /* writeback only */
  21                 flush_dcache_range(addr, addr + size);
  22                 break;
  23         case DMA_FROM_DEVICE: /* invalidate only */
  24         case DMA_BIDIRECTIONAL: /* flush and invalidate */
  25                 /* Blackfin has no dedicated invalidate (it includes a flush) */
  26                 invalidate_dcache_range(addr, addr + size);
  27                 break;
  28         }
  29 }
  30 static inline void
  31 _dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
  32 {
  33         if (__builtin_constant_p(dir))
  34                 __dma_sync_inline(addr, size, dir);
  35         else
  36                 __dma_sync(addr, size, dir);
  37 }
  38
  39 extern const struct dma_map_ops bfin_dma_ops;
  40
  41 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
  42 {
  43         return &bfin_dma_ops;
  44 }
  45
  46 #endif                          /* _BLACKFIN_DMA_MAPPING_H */