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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-07 12:35:33 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-07 12:35:33 +0100 |
commit | 06be5eefe1192eb8ce8d07497f67595b6bfe9741 (patch) | |
tree | 80f1987d4970f8079681f8be0c135cafc8d6329a /arch/h8300/kernel/dma.c | |
parent | ARM: fix lockdep unannotated irqs-off warning (diff) | |
parent | ARM: avoid unwanted GCC memset()/memcpy() optimisations for IO variants (diff) | |
download | linux-dev-06be5eefe1192eb8ce8d07497f67595b6bfe9741.tar.xz linux-dev-06be5eefe1192eb8ce8d07497f67595b6bfe9741.zip |
Merge branches 'fixes' and 'ioremap' into for-linus
Diffstat (limited to 'arch/h8300/kernel/dma.c')
-rw-r--r-- | arch/h8300/kernel/dma.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/h8300/kernel/dma.c b/arch/h8300/kernel/dma.c new file mode 100644 index 000000000000..eeb13d3f2424 --- /dev/null +++ b/arch/h8300/kernel/dma.c @@ -0,0 +1,69 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <linux/dma-mapping.h> +#include <linux/kernel.h> +#include <linux/scatterlist.h> +#include <linux/module.h> +#include <asm/pgalloc.h> + +static void *dma_alloc(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, + struct dma_attrs *attrs) +{ + void *ret; + + /* ignore region specifiers */ + gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); + + if (dev == NULL || (*dev->dma_mask < 0xffffffff)) + gfp |= GFP_DMA; + ret = (void *)__get_free_pages(gfp, get_order(size)); + + if (ret != NULL) { + memset(ret, 0, size); + *dma_handle = virt_to_phys(ret); + } + return ret; +} + +static void dma_free(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle, + struct dma_attrs *attrs) + +{ + free_pages((unsigned long)vaddr, get_order(size)); +} + +static dma_addr_t map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + return page_to_phys(page) + offset; +} + +static int map_sg(struct device *dev, struct scatterlist *sgl, + int nents, enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + struct scatterlist *sg; + int i; + + for_each_sg(sgl, sg, nents, i) { + sg->dma_address = sg_phys(sg); + } + + return nents; +} + +struct dma_map_ops h8300_dma_map_ops = { + .alloc = dma_alloc, + .free = dma_free, + .map_page = map_page, + .map_sg = map_sg, +}; +EXPORT_SYMBOL(h8300_dma_map_ops); |