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dma-mapping.h

/*
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef _BLACKFIN_DMA_MAPPING_H
#define _BLACKFIN_DMA_MAPPING_H

#include <asm/cacheflush.h>
struct scatterlist;

void *dma_alloc_coherent(struct device *dev, size_t size,
                   dma_addr_t *dma_handle, gfp_t gfp);
void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
                   dma_addr_t dma_handle);

/*
 * Now for the API extensions over the pci_ one
 */
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
#define dma_supported(d, m)         (1)

static inline int
dma_set_mask(struct device *dev, u64 dma_mask)
{
      if (!dev->dma_mask || !dma_supported(dev, dma_mask))
            return -EIO;

      *dev->dma_mask = dma_mask;

      return 0;
}

static inline int
dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
      return 0;
}

extern void
__dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
static inline void
__dma_sync_inline(dma_addr_t addr, size_t size, enum dma_data_direction dir)
{
      switch (dir) {
      case DMA_NONE:
            BUG();
      case DMA_TO_DEVICE:           /* writeback only */
            flush_dcache_range(addr, addr + size);
            break;
      case DMA_FROM_DEVICE: /* invalidate only */
      case DMA_BIDIRECTIONAL: /* flush and invalidate */
            /* Blackfin has no dedicated invalidate (it includes a flush) */
            invalidate_dcache_range(addr, addr + size);
            break;
      }
}
static inline void
_dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
{
      if (__builtin_constant_p(dir))
            __dma_sync_inline(addr, size, dir);
      else
            __dma_sync(addr, size, dir);
}

static inline dma_addr_t
dma_map_single(struct device *dev, void *ptr, size_t size,
             enum dma_data_direction dir)
{
      _dma_sync((dma_addr_t)ptr, size, dir);
      return (dma_addr_t) ptr;
}

static inline dma_addr_t
dma_map_page(struct device *dev, struct page *page,
           unsigned long offset, size_t size,
           enum dma_data_direction dir)
{
      return dma_map_single(dev, page_address(page) + offset, size, dir);
}

static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
             enum dma_data_direction dir)
{
      BUG_ON(!valid_dma_direction(dir));
}

static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
             enum dma_data_direction dir)
{
      dma_unmap_single(dev, dma_addr, size, dir);
}

extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
                  enum dma_data_direction dir);

static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg,
           int nhwentries, enum dma_data_direction dir)
{
      BUG_ON(!valid_dma_direction(dir));
}

static inline void
dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
                        unsigned long offset, size_t size,
                        enum dma_data_direction dir)
{
      BUG_ON(!valid_dma_direction(dir));
}

static inline void
dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
                         unsigned long offset, size_t size,
                         enum dma_data_direction dir)
{
      _dma_sync(handle + offset, size, dir);
}

static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
                  enum dma_data_direction dir)
{
      dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
}

static inline void
dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
                     enum dma_data_direction dir)
{
      dma_sync_single_range_for_device(dev, handle, 0, size, dir);
}

static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
                enum dma_data_direction dir)
{
      BUG_ON(!valid_dma_direction(dir));
}

extern void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
                   int nents, enum dma_data_direction dir);

static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
             enum dma_data_direction dir)
{
      _dma_sync((dma_addr_t)vaddr, size, dir);
}

#endif                        /* _BLACKFIN_DMA_MAPPING_H */

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