LXR linux/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
  12extern void
  13__dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
  14static 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}
  30static 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
  39extern const struct dma_map_ops bfin_dma_ops;
  40
  41static 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 */
  47