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/* Copyright (C) 2002 by James.Bottomley@HansenPartnership.com
 *
 * Implements the generic device dma API via the existing pci_ one
 * for unconverted architectures
 */

#ifndef _ASM_GENERIC_DMA_MAPPING_H
#define _ASM_GENERIC_DMA_MAPPING_H

/* we implement the API below in terms of the existing PCI one,
 * so include it */
#include <linux/pci.h>
/* need struct page definitions */
#include <linux/mm.h>

static inline int
dma_supported(struct device *dev, u64 mask)
{
        BUG_ON(dev->bus != &pci_bus_type);

        return pci_dma_supported(to_pci_dev(dev), mask);
}

static inline int
dma_set_mask(struct device *dev, u64 dma_mask)
{
        BUG_ON(dev->bus != &pci_bus_type);

        return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
}

static inline void *
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
                   int flag)
{
        BUG_ON(dev->bus != &pci_bus_type);

        return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
}

static inline void
dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
                    dma_addr_t dma_handle)
{
        BUG_ON(dev->bus != &pci_bus_type);

        pci_free_consistent(to_pci_dev(dev), size, cpu_addr, dma_handle);
}

static inline dma_addr_t
dma_map_single(struct device *dev, void *cpu_addr, size_t size,
               enum dma_data_direction direction)
{
        BUG_ON(dev->bus != &pci_bus_type);

        return pci_map_single(to_pci_dev(dev), cpu_addr, size, (int)direction);
}

static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
                 enum dma_data_direction direction)
{
        BUG_ON(dev->bus != &pci_bus_type);

        pci_unmap_single(to_pci_dev(dev), dma_addr, size, (int)direction);
}

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(dev->bus != &pci_bus_type);

        return pci_map_page(to_pci_dev(dev), page, offset, size, (int)direction);
}

static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
               enum dma_data_direction direction)
{
        BUG_ON(dev->bus != &pci_bus_type);

        pci_unmap_page(to_pci_dev(dev), dma_address, size, (int)direction);
}

static inline int
dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
           enum dma_data_direction direction)
{
        BUG_ON(dev->bus != &pci_bus_type);

        return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
}

static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
             enum dma_data_direction direction)
{
        BUG_ON(dev->bus != &pci_bus_type);

        pci_unmap_sg(to_pci_dev(dev), sg, nhwentries, (int)direction);
}

static inline void
dma_sync_single(struct device *dev, dma_addr_t dma_handle, size_t size,
                enum dma_data_direction direction)
{
        BUG_ON(dev->bus != &pci_bus_type);

        pci_dma_sync_single(to_pci_dev(dev), dma_handle, size, (int)direction);
}

static inline void
dma_sync_sg(struct device *dev, struct scatterlist *sg, int nelems,
            enum dma_data_direction direction)
{
        BUG_ON(dev->bus != &pci_bus_type);

        pci_dma_sync_sg(to_pci_dev(dev), sg, nelems, (int)direction);
}

/* 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_is_consistent(d)    (1)

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

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)
{
        /* just sync everything, that's all the pci API can do */
        dma_sync_single(dev, dma_handle, offset+size, direction);
}

static inline void
dma_cache_sync(void *vaddr, size_t size,
               enum dma_data_direction direction)
{
        /* could define this in terms of the dma_cache ... operations,
         * but if you get this on a platform, you should convert the platform
         * to using the generic device DMA API */
        BUG();
}

#endif