forked from Minki/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
#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
|