139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
#ifndef _X8664_DMA_MAPPING_H
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#define _X8664_DMA_MAPPING_H 1
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/*
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* IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
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* documentation.
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*/
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#include <linux/config.h>
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#include <asm/scatterlist.h>
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#include <asm/io.h>
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#include <asm/swiotlb.h>
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extern dma_addr_t bad_dma_address;
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#define dma_mapping_error(x) \
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(swiotlb ? swiotlb_dma_mapping_error(x) : ((x) == bad_dma_address))
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void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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unsigned gfp);
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void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle);
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#ifdef CONFIG_GART_IOMMU
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extern dma_addr_t dma_map_single(struct device *hwdev, void *ptr, size_t size,
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int direction);
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extern void dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
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int direction);
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#else
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/* No IOMMU */
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static inline dma_addr_t dma_map_single(struct device *hwdev, void *ptr,
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size_t size, int direction)
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{
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dma_addr_t addr;
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if (direction == DMA_NONE)
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out_of_line_bug();
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addr = virt_to_bus(ptr);
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if ((addr+size) & ~*hwdev->dma_mask)
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out_of_line_bug();
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return addr;
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}
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static inline void dma_unmap_single(struct device *hwdev, dma_addr_t dma_addr,
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size_t size, int direction)
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{
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if (direction == DMA_NONE)
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out_of_line_bug();
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/* Nothing to do */
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}
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#endif
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#define dma_map_page(dev,page,offset,size,dir) \
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dma_map_single((dev), page_address(page)+(offset), (size), (dir))
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static inline void dma_sync_single_for_cpu(struct device *hwdev,
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dma_addr_t dma_handle,
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size_t size, int direction)
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{
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if (direction == DMA_NONE)
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out_of_line_bug();
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if (swiotlb)
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return swiotlb_sync_single_for_cpu(hwdev,dma_handle,size,direction);
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flush_write_buffers();
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}
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static inline void dma_sync_single_for_device(struct device *hwdev,
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dma_addr_t dma_handle,
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size_t size, int direction)
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{
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if (direction == DMA_NONE)
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out_of_line_bug();
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if (swiotlb)
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return swiotlb_sync_single_for_device(hwdev,dma_handle,size,direction);
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flush_write_buffers();
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}
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static inline void dma_sync_sg_for_cpu(struct device *hwdev,
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struct scatterlist *sg,
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int nelems, int direction)
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{
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if (direction == DMA_NONE)
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out_of_line_bug();
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if (swiotlb)
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return swiotlb_sync_sg_for_cpu(hwdev,sg,nelems,direction);
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flush_write_buffers();
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}
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static inline void dma_sync_sg_for_device(struct device *hwdev,
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struct scatterlist *sg,
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int nelems, int direction)
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{
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if (direction == DMA_NONE)
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out_of_line_bug();
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if (swiotlb)
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return swiotlb_sync_sg_for_device(hwdev,sg,nelems,direction);
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flush_write_buffers();
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}
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extern int dma_map_sg(struct device *hwdev, struct scatterlist *sg,
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int nents, int direction);
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extern void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg,
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int nents, int direction);
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#define dma_unmap_page dma_unmap_single
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extern int dma_supported(struct device *hwdev, u64 mask);
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extern int dma_get_cache_alignment(void);
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#define dma_is_consistent(h) 1
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static inline int dma_set_mask(struct device *dev, u64 mask)
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{
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if (!dev->dma_mask || !dma_supported(dev, mask))
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return -EIO;
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*dev->dma_mask = mask;
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return 0;
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}
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static inline void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
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{
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flush_write_buffers();
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}
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#endif
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