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Commit 2b4f767a authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Linus Torvalds
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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: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 027491f4

arch/blackfin/include/asm/dma-mapping.h

+0 −36
Original line number Diff line number Diff line
@@ -65,13 +65,6 @@ _dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir) 
	}

}



/*

 * Map a single buffer of the indicated size for DMA in streaming mode.

 * The 32-bit bus address to use is returned.

 *

 * Once the device is given the dma address, the device owns this memory

 * until either pci_unmap_single or pci_dma_sync_single is performed.

 */

static inline dma_addr_t

dma_map_single(struct device *dev, void *ptr, size_t size,

	       enum dma_data_direction dir)
@@ -88,14 +81,6 @@ dma_map_page(struct device *dev, struct page *page, 
	return dma_map_single(dev, page_address(page) + offset, size, dir);

}



/*

 * Unmap a single streaming mode DMA translation.  The dma_addr and size

 * must match what was provided for in a previous pci_map_single call.  All

 * other usages are undefined.

 *

 * After this call, reads by the cpu to the buffer are guarenteed to see

 * whatever the device wrote there.

 */

static inline void

dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,

		 enum dma_data_direction dir)
@@ -110,30 +95,9 @@ dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, 
	dma_unmap_single(dev, dma_addr, size, dir);

}



/*

 * Map a set of buffers described by scatterlist in streaming

 * mode for DMA.  This is the scather-gather version of the

 * above pci_map_single interface.  Here the scatter gather list

 * elements are each tagged with the appropriate dma address

 * and length.  They are obtained via sg_dma_{address,length}(SG).

 *

 * NOTE: An implementation may be able to use a smaller number of

 *       DMA address/length pairs than there are SG table elements.

 *       (for example via virtual mapping capabilities)

 *       The routine returns the number of addr/length pairs actually

 *       used, at most nents.

 *

 * Device ownership issues as mentioned above for pci_map_single are

 * the same here.

 */

extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,

		      enum dma_data_direction dir);



/*

 * Unmap a set of streaming mode DMA translations.

 * Again, cpu read rules concerning calls here are the same as for

 * pci_unmap_single() above.

 */

static inline void

dma_unmap_sg(struct device *dev, struct scatterlist *sg,

	     int nhwentries, enum dma_data_direction dir)