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