dma-mapping: blackfin: remove the obsolete and unnecessary DMA API comments
pci_dma_sync_single was obsoleted long ago. All the comments are generic, not architecture specific, simply describes some of the DMA-API (and the same comments are in other files). Documentation/DMA-API.txt have more detailed descriptions. This removes the above obsolete and unnecessary DMA API comments. Let's describe the DMA API in only Documentation/DMA-API.txt. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -65,13 +65,6 @@ _dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
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}
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}
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}
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}
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/*
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* Map a single buffer of the indicated size for DMA in streaming mode.
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* The 32-bit bus address to use is returned.
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*
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* Once the device is given the dma address, the device owns this memory
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* until either pci_unmap_single or pci_dma_sync_single is performed.
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*/
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static inline dma_addr_t
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static inline dma_addr_t
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dma_map_single(struct device *dev, void *ptr, size_t size,
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dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction dir)
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enum dma_data_direction dir)
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@ -88,14 +81,6 @@ dma_map_page(struct device *dev, struct page *page,
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return dma_map_single(dev, page_address(page) + offset, size, dir);
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return dma_map_single(dev, page_address(page) + offset, size, dir);
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}
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}
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/*
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* Unmap a single streaming mode DMA translation. The dma_addr and size
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* must match what was provided for in a previous pci_map_single call. All
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* other usages are undefined.
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*
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* After this call, reads by the cpu to the buffer are guarenteed to see
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* whatever the device wrote there.
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*/
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static inline void
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static inline void
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dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction dir)
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enum dma_data_direction dir)
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@ -110,30 +95,9 @@ dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
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dma_unmap_single(dev, dma_addr, size, dir);
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dma_unmap_single(dev, dma_addr, size, dir);
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}
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}
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/*
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* Map a set of buffers described by scatterlist in streaming
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* mode for DMA. This is the scather-gather version of the
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* above pci_map_single interface. Here the scatter gather list
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* elements are each tagged with the appropriate dma address
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* and length. They are obtained via sg_dma_{address,length}(SG).
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*
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* NOTE: An implementation may be able to use a smaller number of
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* DMA address/length pairs than there are SG table elements.
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* (for example via virtual mapping capabilities)
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* The routine returns the number of addr/length pairs actually
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* used, at most nents.
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*
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* Device ownership issues as mentioned above for pci_map_single are
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* the same here.
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*/
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extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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enum dma_data_direction dir);
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/*
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* Unmap a set of streaming mode DMA translations.
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* Again, cpu read rules concerning calls here are the same as for
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* pci_unmap_single() above.
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*/
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static inline void
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static inline void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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int nhwentries, enum dma_data_direction dir)
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int nhwentries, enum dma_data_direction dir)
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