dma-mapping.h
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#ifndef _X8664_DMA_MAPPING_H
#define _X8664_DMA_MAPPING_H 1
/*
* IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
* documentation.
*/
#include <linux/config.h>
#include <asm/scatterlist.h>
#include <asm/io.h>
#include <asm/swiotlb.h>
extern dma_addr_t bad_dma_address;
#define dma_mapping_error(x) \
(swiotlb ? swiotlb_dma_mapping_error(x) : ((x) == bad_dma_address))
void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
unsigned gfp);
void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle);
#ifdef CONFIG_GART_IOMMU
extern dma_addr_t dma_map_single(struct device *hwdev, void *ptr, size_t size,
int direction);
extern void dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
int direction);
#else
/* No IOMMU */
static inline dma_addr_t dma_map_single(struct device *hwdev, void *ptr,
size_t size, int direction)
{
dma_addr_t addr;
if (direction == DMA_NONE)
out_of_line_bug();
addr = virt_to_bus(ptr);
if ((addr+size) & ~*hwdev->dma_mask)
out_of_line_bug();
return addr;
}
static inline void dma_unmap_single(struct device *hwdev, dma_addr_t dma_addr,
size_t size, int direction)
{
if (direction == DMA_NONE)
out_of_line_bug();
/* Nothing to do */
}
#endif
#define dma_map_page(dev,page,offset,size,dir) \
dma_map_single((dev), page_address(page)+(offset), (size), (dir))
static inline void dma_sync_single_for_cpu(struct device *hwdev,
dma_addr_t dma_handle,
size_t size, int direction)
{
if (direction == DMA_NONE)
out_of_line_bug();
if (swiotlb)
return swiotlb_sync_single_for_cpu(hwdev,dma_handle,size,direction);
flush_write_buffers();
}
static inline void dma_sync_single_for_device(struct device *hwdev,
dma_addr_t dma_handle,
size_t size, int direction)
{
if (direction == DMA_NONE)
out_of_line_bug();
if (swiotlb)
return swiotlb_sync_single_for_device(hwdev,dma_handle,size,direction);
flush_write_buffers();
}
static inline void dma_sync_sg_for_cpu(struct device *hwdev,
struct scatterlist *sg,
int nelems, int direction)
{
if (direction == DMA_NONE)
out_of_line_bug();
if (swiotlb)
return swiotlb_sync_sg_for_cpu(hwdev,sg,nelems,direction);
flush_write_buffers();
}
static inline void dma_sync_sg_for_device(struct device *hwdev,
struct scatterlist *sg,
int nelems, int direction)
{
if (direction == DMA_NONE)
out_of_line_bug();
if (swiotlb)
return swiotlb_sync_sg_for_device(hwdev,sg,nelems,direction);
flush_write_buffers();
}
extern int dma_map_sg(struct device *hwdev, struct scatterlist *sg,
int nents, int direction);
extern void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg,
int nents, int direction);
#define dma_unmap_page dma_unmap_single
extern int dma_supported(struct device *hwdev, u64 mask);
extern int dma_get_cache_alignment(void);
#define dma_is_consistent(h) 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 void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
{
flush_write_buffers();
}
#endif