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dma-mapping: mn10300: remove the obsolete and unnecessary DMA API comments

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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: David Howells <dhowells@redhat.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2010-03-10 15:23:33 -08:00 committed by Linus Torvalds
parent 2b4f767af7
commit 06db881b4f
1 changed files with 5 additions and 60 deletions
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65
arch/mn10300/include/asm/dma-mapping.h
View File

@ -17,6 +17,11 @@
#include <asm/cache.h>
#include <asm/io.h>
/*
* See Documentation/DMA-API.txt for the description of how the
* following DMA API should work.
*/
extern void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, int flag);
@ -26,13 +31,6 @@ extern void dma_free_coherent(struct device *dev, size_t size,
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent((d), (s), (h), (f))
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent((d), (s), (v), (h))
/*
* 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 direction)
@ -42,14 +40,6 @@ dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
return virt_to_bus(ptr);
}
/*
* 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 direction)
@ -57,20 +47,6 @@ void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
BUG_ON(direction == DMA_NONE);
}
/*
* 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.
*/
static inline
int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
enum dma_data_direction direction)
@ -91,11 +67,6 @@ int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
return nents;
}
/*
* 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 direction)
@ -103,10 +74,6 @@ void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
BUG_ON(!valid_dma_direction(direction));
}
/*
* pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
* to pci_map_single, but takes a struct page instead of a virtual address
*/
static inline
dma_addr_t dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
@ -123,15 +90,6 @@ void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
BUG_ON(direction == DMA_NONE);
}
/*
* Make physical memory consistent for a single streaming mode DMA translation
* after a transfer.
*
* If you perform a pci_map_single() but wish to interrogate the buffer using
* the cpu, yet do not wish to teardown the PCI dma mapping, you must call this
* function before doing so. At the next point you give the PCI dma address
* back to the card, the device again owns the buffer.
*/
static inline
void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction)
@ -161,13 +119,6 @@ dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
}
/*
* Make physical memory consistent for a set of streaming mode DMA translations
* after a transfer.
*
* The same as pci_dma_sync_single but for a scatter-gather list, same rules
* and usage.
*/
static inline
void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
int nelems, enum dma_data_direction direction)
@ -187,12 +138,6 @@ int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
return 0;
}
/*
* Return whether the given PCI device DMA address mask can be supported
* properly. For example, if your device can only drive the low 24-bits during
* PCI bus mastering, then you would pass 0x00ffffff as the mask to this
* function.
*/
static inline
int dma_supported(struct device *dev, u64 mask)
{