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#ifndef _ASM_I386_DMA_MAPPING_H
#define _ASM_I386_DMA_MAPPING_H

#include <asm/cache.h>

#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)

void *dma_alloc_coherent(struct device *dev, size_t size,
                           dma_addr_t *dma_handle, int flag);

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

static inline dma_addr_t
dma_map_single(struct device *dev, void *ptr, size_t size,
               enum dma_data_direction direction)
{
        BUG_ON(direction == DMA_NONE);
        flush_write_buffers();
        return virt_to_phys(ptr);
}

static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
                 enum dma_data_direction direction)
{
        BUG_ON(direction == DMA_NONE);
}

static inline int
dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
           enum dma_data_direction direction)
{
        int i;

        BUG_ON(direction == DMA_NONE);

        for (i = 0; i < nents; i++ ) {
                BUG_ON(!sg[i].page);

                sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
        }

        flush_write_buffers();
        return nents;
}

static inline dma_addr_t
dma_map_page(struct device *dev, struct page *page, unsigned long offset,
             size_t size, enum dma_data_direction direction)
{
        BUG_ON(direction == DMA_NONE);
        return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
}

static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
               enum dma_data_direction direction)
{
        BUG_ON(direction == DMA_NONE);
}


static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
             enum dma_data_direction direction)
{
        BUG_ON(direction == DMA_NONE);
}

static inline void
dma_sync_single(struct device *dev, dma_addr_t dma_handle, size_t size,
                enum dma_data_direction direction)
{
        flush_write_buffers();
}

static inline void
dma_sync_single_range(struct device *dev, dma_addr_t dma_handle,
                      unsigned long offset, size_t size,
                      enum dma_data_direction direction)
{
        flush_write_buffers();
}


static inline void
dma_sync_sg(struct device *dev, struct scatterlist *sg, int nelems,
                 enum dma_data_direction direction)
{
        flush_write_buffers();
}

static inline int
dma_supported(struct device *dev, u64 mask)
{
        /*
         * we fall back to GFP_DMA when the mask isn't all 1s,
         * so we can't guarantee allocations that must be
         * within a tighter range than GFP_DMA..
         */
        if(mask < 0x00ffffff)
                return 0;

        return 1;
}

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

        *dev->dma_mask = mask;

        return 0;
}

static inline int
dma_get_cache_alignment(void)
{
        /* no easy way to get cache size on all x86, so return the
         * maximum possible, to be safe */
        return (1 << L1_CACHE_SHIFT_MAX);
}

#define dma_is_consistent(d)    (1)

static inline void
dma_cache_sync(void *vaddr, size_t size,
               enum dma_data_direction direction)
{
        flush_write_buffers();
}

#endif