47 lines
1.0 KiB
C
47 lines
1.0 KiB
C
#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <asm/dma-mapping.h>
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static dma_addr_t pci32_map_single(struct device *dev, void *ptr,
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size_t size, int direction)
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{
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WARN_ON(size == 0);
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flush_write_buffers();
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return virt_to_phys(ptr);
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}
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static int pci32_dma_map_sg(struct device *dev, struct scatterlist *sglist,
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int nents, int direction)
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{
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struct scatterlist *sg;
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int i;
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WARN_ON(nents == 0 || sglist[0].length == 0);
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for_each_sg(sglist, sg, nents, i) {
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BUG_ON(!sg_page(sg));
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sg->dma_address = sg_phys(sg);
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}
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flush_write_buffers();
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return nents;
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}
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static const struct dma_mapping_ops pci32_dma_ops = {
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.map_single = pci32_map_single,
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.unmap_single = NULL,
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.map_sg = pci32_dma_map_sg,
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.unmap_sg = NULL,
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.sync_single_for_cpu = NULL,
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.sync_single_for_device = NULL,
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.sync_single_range_for_cpu = NULL,
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.sync_single_range_for_device = NULL,
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.sync_sg_for_cpu = NULL,
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};
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const struct dma_mapping_ops *dma_ops = &pci32_dma_ops;
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EXPORT_SYMBOL(dma_ops);
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