forked from Minki/linux
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/scatterlist.h>
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#include <linux/module.h>
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#include <asm/pgalloc.h>
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static void *dma_alloc(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp,
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struct dma_attrs *attrs)
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{
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void *ret;
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/* ignore region specifiers */
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gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
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if (dev == NULL || (*dev->dma_mask < 0xffffffff))
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gfp |= GFP_DMA;
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ret = (void *)__get_free_pages(gfp, get_order(size));
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if (ret != NULL) {
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memset(ret, 0, size);
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*dma_handle = virt_to_phys(ret);
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}
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return ret;
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}
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static void dma_free(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle,
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struct dma_attrs *attrs)
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{
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free_pages((unsigned long)vaddr, get_order(size));
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}
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static dma_addr_t map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction direction,
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struct dma_attrs *attrs)
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{
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return page_to_phys(page) + offset;
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}
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static int map_sg(struct device *dev, struct scatterlist *sgl,
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int nents, enum dma_data_direction direction,
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struct dma_attrs *attrs)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sgl, sg, nents, i) {
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sg->dma_address = sg_phys(sg);
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}
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return nents;
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}
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struct dma_map_ops h8300_dma_map_ops = {
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.alloc = dma_alloc,
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.free = dma_free,
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.map_page = map_page,
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.map_sg = map_sg,
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};
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EXPORT_SYMBOL(h8300_dma_map_ops);
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