diff options
Diffstat (limited to 'include/asm-x86_64/dma-mapping.h')
-rw-r--r-- | include/asm-x86_64/dma-mapping.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/include/asm-x86_64/dma-mapping.h b/include/asm-x86_64/dma-mapping.h new file mode 100644 index 0000000..a416dc3 --- /dev/null +++ b/include/asm-x86_64/dma-mapping.h @@ -0,0 +1,138 @@ +#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 |