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Message-Id: <20100212150027Y.fujita.tomonori@lab.ntt.co.jp>
Date: Fri, 12 Feb 2010 15:04:55 +0900
From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To: linux-kernel@...r.kernel.org
Cc: akpm@...ux-foundation.org, vapier@...too.org
Subject: [PATCH -mm] 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@....ntt.co.jp>
Cc: Mike Frysinger <vapier@...too.org>
---
arch/blackfin/include/asm/dma-mapping.h | 36 -------------------------------
1 files changed, 0 insertions(+), 36 deletions(-)
diff --git a/arch/blackfin/include/asm/dma-mapping.h b/arch/blackfin/include/asm/dma-mapping.h
index f9172ff..413a303 100644
--- a/arch/blackfin/include/asm/dma-mapping.h
+++ b/arch/blackfin/include/asm/dma-mapping.h
@@ -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)
--
1.5.6.5
--
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