diff options
| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-09-25 22:05:02 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-09-26 00:39:24 +0200 |
| commit | 01135d92c1a540cd3370f7cf3d1c762320b85034 (patch) | |
| tree | a6344d942a4f63cba85290a93008ce211996d27d /arch/arm/mm | |
| parent | [ARM] dma: provide a better dma_map_page() implementation (diff) | |
| download | linux-01135d92c1a540cd3370f7cf3d1c762320b85034.tar.xz linux-01135d92c1a540cd3370f7cf3d1c762320b85034.zip | |
[ARM] dma: Reduce to one dma_map_sg()/dma_unmap_sg() implementation
No point having two of these; dma_map_page() can do all the work
for us.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 7bf3e6fdfb57..c9c1206e358c 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -513,7 +513,6 @@ void dma_cache_maint(const void *start, size_t size, int direction) } EXPORT_SYMBOL(dma_cache_maint); -#ifndef CONFIG_DMABOUNCE /** * 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 @@ -534,16 +533,20 @@ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir) { struct scatterlist *s; - int i; + int i, j; for_each_sg(sg, s, nents, i) { - s->dma_address = page_to_dma(dev, sg_page(s)) + s->offset; - - if (!arch_is_coherent()) - dma_cache_maint(sg_virt(s), s->length, dir); + s->dma_address = dma_map_page(dev, sg_page(s), s->offset, + s->length, dir); + if (dma_mapping_error(dev, s->dma_address)) + goto bad_mapping; } - return nents; + + bad_mapping: + for_each_sg(sg, s, i, j) + dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir); + return 0; } EXPORT_SYMBOL(dma_map_sg); @@ -560,10 +563,15 @@ EXPORT_SYMBOL(dma_map_sg); void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir) { - /* nothing to do */ + struct scatterlist *s; + int i; + + for_each_sg(sg, s, nents, i) + dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir); } EXPORT_SYMBOL(dma_unmap_sg); +#ifndef CONFIG_DMABOUNCE /** * dma_sync_sg_for_cpu * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |