diff options
| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-09-25 21:59:12 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-09-26 00:39:24 +0200 |
| commit | 56f55f8b58a02e95b401cb50df05086cabeaeeb5 (patch) | |
| tree | 3be7e3383157c731178ca447008c0e7c236bfbfc /arch/arm/common/dmabounce.c | |
| parent | [ARM] Update dma_map_sg()/dma_unmap_sg() API (diff) | |
| download | linux-56f55f8b58a02e95b401cb50df05086cabeaeeb5.tar.xz linux-56f55f8b58a02e95b401cb50df05086cabeaeeb5.zip | |
[ARM] dma: provide a better dma_map_page() implementation
We can translate a struct page directly to a DMA address using
page_to_dma(). No need to use page_address() followed by
virt_to_dma().
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/common/dmabounce.c')
| -rw-r--r-- | arch/arm/common/dmabounce.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c index 35c72bcf3d0b..c7f23ced0a36 100644 --- a/arch/arm/common/dmabounce.c +++ b/arch/arm/common/dmabounce.c @@ -412,6 +412,19 @@ dma_map_single(struct device *dev, void *ptr, size_t size, return dma_addr; } +dma_addr_t dma_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir) +{ + dev_dbg(dev, "%s(page=%p,off=%#lx,size=%zx,dir=%x)\n", + __func__, page, offset, size, dir); + + BUG_ON(dir == DMA_NONE); + + return map_single(dev, page_address(page) + offset, size, dir); +} +EXPORT_SYMBOL(dma_map_page); + /* * see if a mapped address was really a "safe" buffer and if so, copy * the data from the safe buffer back to the unsafe buffer and free up |