dma-mapping.h

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#ifndef __ASM_SH_DMA_MAPPING_H
#define __ASM_SH_DMA_MAPPING_H

extern struct dma_map_ops *dma_ops;
extern void no_iommu_init(void);

static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
    return dma_ops;
}

#include <asm-generic/dma-coherent.h>
#include <asm-generic/dma-mapping-common.h>

static inline int dma_supported(struct device *dev, u64 mask)
{
    struct dma_map_ops *ops = get_dma_ops(dev);

    if (ops->dma_supported)
        return ops->dma_supported(dev, mask);

    return 1;
}

static inline int dma_set_mask(struct device *dev, u64 mask)
{
    struct dma_map_ops *ops = get_dma_ops(dev);

    if (!dev->dma_mask || !dma_supported(dev, mask))
        return -EIO;
    if (ops->set_dma_mask)
        return ops->set_dma_mask(dev, mask);

    *dev->dma_mask = mask;

    return 0;
}

void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
            enum dma_data_direction dir);

#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)

static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
    struct dma_map_ops *ops = get_dma_ops(dev);

    if (ops->mapping_error)
        return ops->mapping_error(dev, dma_addr);

    return dma_addr == 0;
}

#define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)

static inline void *dma_alloc_attrs(struct device *dev, size_t size,
                    dma_addr_t *dma_handle, gfp_t gfp,
                    struct dma_attrs *attrs)
{
    struct dma_map_ops *ops = get_dma_ops(dev);
    void *memory;

    if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
        return memory;
    if (!ops->alloc)
        return NULL;

    memory = ops->alloc(dev, size, dma_handle, gfp, attrs);
    debug_dma_alloc_coherent(dev, size, *dma_handle, memory);

    return memory;
}

#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)

static inline void dma_free_attrs(struct device *dev, size_t size,
                  void *vaddr, dma_addr_t dma_handle,
                  struct dma_attrs *attrs)
{
    struct dma_map_ops *ops = get_dma_ops(dev);

    if (dma_release_from_coherent(dev, get_order(size), vaddr))
        return;

    debug_dma_free_coherent(dev, size, vaddr, dma_handle);
    if (ops->free)
        ops->free(dev, size, vaddr, dma_handle, attrs);
}

/* arch/sh/mm/consistent.c */
extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
                    dma_addr_t *dma_addr, gfp_t flag,
                    struct dma_attrs *attrs);
extern void dma_generic_free_coherent(struct device *dev, size_t size,
                      void *vaddr, dma_addr_t dma_handle,
                      struct dma_attrs *attrs);

#endif /* __ASM_SH_DMA_MAPPING_H */