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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 <asm/scatterlist.h>
#include <asm/io.h>
#include <asm/swiotlb.h>
struct dma_mapping_ops {
int (*mapping_error)(dma_addr_t dma_addr);
void* (*alloc_coherent)(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
void (*free_coherent)(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle);
dma_addr_t (*map_single)(struct device *hwdev, void *ptr,
size_t size, int direction);
/* like map_single, but doesn't check the device mask */
dma_addr_t (*map_simple)(struct device *hwdev, char *ptr,
size_t size, int direction);
void (*unmap_single)(struct device *dev, dma_addr_t addr,
size_t size, int direction);
void (*sync_single_for_cpu)(struct device *hwdev,
dma_addr_t dma_handle, size_t size,
int direction);
void (*sync_single_for_device)(struct device *hwdev,
dma_addr_t dma_handle, size_t size,
int direction);
void (*sync_single_range_for_cpu)(struct device *hwdev,
dma_addr_t dma_handle, unsigned long offset,
size_t size, int direction);
void (*sync_single_range_for_device)(struct device *hwdev,
dma_addr_t dma_handle, unsigned long offset,
size_t size, int direction);
void (*sync_sg_for_cpu)(struct device *hwdev,
struct scatterlist *sg, int nelems,
int direction);
void (*sync_sg_for_device)(struct device *hwdev,
struct scatterlist *sg, int nelems,
int direction);
int (*map_sg)(struct device *hwdev, struct scatterlist *sg,
int nents, int direction);
void (*unmap_sg)(struct device *hwdev,
struct scatterlist *sg, int nents,
int direction);
int (*dma_supported)(struct device *hwdev, u64 mask);
int is_phys;
};
extern dma_addr_t bad_dma_address;
extern struct dma_mapping_ops* dma_ops;
extern int iommu_merge;
static inline int valid_dma_direction(int dma_direction)
{
return ((dma_direction == DMA_BIDIRECTIONAL) ||
(dma_direction == DMA_TO_DEVICE) ||
(dma_direction == DMA_FROM_DEVICE));
}
static inline int dma_mapping_error(dma_addr_t dma_addr)
{
if (dma_ops->mapping_error)
return dma_ops->mapping_error(dma_addr);
return (dma_addr == bad_dma_address);
}
extern void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
extern 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 *hwdev, void *ptr, size_t size,
int direction)
{
BUG_ON(!valid_dma_direction(direction));
return dma_ops->map_single(hwdev, ptr, size, direction);
}
static inline void
dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
int direction)
{
BUG_ON(!valid_dma_direction(direction));
dma_ops->unmap_single(dev, addr, size, direction);
}
#define dma_map_page(dev,page,offset,size,dir) \
dma_map_single((dev), page_address(page)+(offset), (size), (dir))
#define dma_unmap_page dma_unmap_single
static inline void
dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
size_t size, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_single_for_cpu)
dma_ops->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)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_single_for_device)
dma_ops->sync_single_for_device(hwdev, dma_handle, size,
direction);
flush_write_buffers();
}
static inline void
dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
unsigned long offset, size_t size, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_single_range_for_cpu) {
dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
}
flush_write_buffers();
}
static inline void
dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
unsigned long offset, size_t size, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_single_range_for_device)
dma_ops->sync_single_range_for_device(hwdev, dma_handle,
offset, size, direction);
flush_write_buffers();
}
static inline void
dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
int nelems, int direction)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_sg_for_cpu)
dma_ops->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)
{
BUG_ON(!valid_dma_direction(direction));
if (dma_ops->sync_sg_for_device) {
dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
}
flush_write_buffers();
}
static inline int
dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
{
BUG_ON(!valid_dma_direction(direction));
return dma_ops->map_sg(hwdev, sg, nents, direction);
}
static inline void
dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
int direction)
{
BUG_ON(!valid_dma_direction(direction));
dma_ops->unmap_sg(hwdev, sg, nents, direction);
}
extern int dma_supported(struct device *hwdev, u64 mask);
/* same for gart, swiotlb, and nommu */
static inline int dma_get_cache_alignment(void)
{
return boot_cpu_data.x86_clflush_size;
}
#define dma_is_consistent(h) 1
extern int dma_set_mask(struct device *dev, u64 mask);
static inline void
dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
{
flush_write_buffers();
}
extern struct device fallback_dev;
extern int panic_on_overflow;
#endif /* _X8664_DMA_MAPPING_H */
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