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[ARM] Update dma_map_sg()/dma_unmap_sg() API

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Update the ARM DMA scatter gather APIs for the scatterlist changes.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2008-09-25 16:30:57 +01:00
committed by Russell King
parent 0ddbccd118
commit afd1a321c4
3 changed files with 115 additions and 125 deletions
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115
arch/arm/include/asm/dma-mapping.h
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@ -281,75 +281,6 @@ dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
dma_unmap_single(dev, handle, size, dir);
}
/**
* dma_map_sg - map a set of SG buffers for streaming mode DMA
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @sg: list of buffers
* @nents: number of buffers to map
* @dir: DMA transfer direction
*
* Map a set of buffers described by scatterlist in streaming
* mode for DMA. This is the scatter-gather version of the
* above dma_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 dma_map_single are
* the same here.
*/
#ifndef CONFIG_DMABOUNCE
static inline int
dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
int i;
for (i = 0; i < nents; i++, sg++) {
char *virt;
sg->dma_address = page_to_dma(dev, sg_page(sg)) + sg->offset;
virt = sg_virt(sg);
if (!arch_is_coherent())
dma_cache_maint(virt, sg->length, dir);
}
return nents;
}
#else
extern int dma_map_sg(struct device *, struct scatterlist *, int, enum dma_data_direction);
#endif
/**
* dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @sg: list of buffers
* @nents: number of buffers to map
* @dir: DMA transfer direction
*
* Unmap a set of streaming mode DMA translations.
* Again, CPU read rules concerning calls here are the same as for
* dma_unmap_single() above.
*/
#ifndef CONFIG_DMABOUNCE
static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
/* nothing to do */
}
#else
extern void dma_unmap_sg(struct device *, struct scatterlist *, int, enum dma_data_direction);
#endif
/**
* dma_sync_single_range_for_cpu
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
@ -405,50 +336,14 @@ dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
dma_sync_single_range_for_device(dev, handle, 0, size, dir);
}
/**
* dma_sync_sg_for_cpu
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @sg: list of buffers
* @nents: number of buffers to map
* @dir: DMA transfer direction
*
* Make physical memory consistent for a set of streaming
* mode DMA translations after a transfer.
*
* The same as dma_sync_single_for_* but for a scatter-gather list,
* same rules and usage.
/*
* The scatter list versions of the above methods.
*/
#ifndef CONFIG_DMABOUNCE
static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
int i;
for (i = 0; i < nents; i++, sg++) {
char *virt = sg_virt(sg);
if (!arch_is_coherent())
dma_cache_maint(virt, sg->length, dir);
}
}
static inline void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
int i;
for (i = 0; i < nents; i++, sg++) {
char *virt = sg_virt(sg);
if (!arch_is_coherent())
dma_cache_maint(virt, sg->length, dir);
}
}
#else
extern int dma_map_sg(struct device *, struct scatterlist *, int, enum dma_data_direction);
extern void dma_unmap_sg(struct device *, struct scatterlist *, int, enum dma_data_direction);
extern void dma_sync_sg_for_cpu(struct device*, struct scatterlist*, int, enum dma_data_direction);
extern void dma_sync_sg_for_device(struct device*, struct scatterlist*, int, enum dma_data_direction);
#endif
#ifdef CONFIG_DMABOUNCE
/*