1/*
2 * Dynamic DMA mapping support.
3 *
4 * We never have any address translations to worry about, so this
5 * is just alloc/free.
6 */
7
8#include <linux/types.h>
9#include <linux/mm.h>
10#include <linux/string.h>
11#include <asm/io.h>
12
13void *dma_alloc_coherent(struct device *dev, size_t size,
14			   dma_addr_t *dma_handle, int gfp)
15{
16	void *ret;
17	/* ignore region specifiers */
18	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
19
20	if (dev == NULL || (*dev->dma_mask < 0xffffffff))
21		gfp |= GFP_DMA;
22	ret = (void *)__get_free_pages(gfp, get_order(size));
23
24	if (ret != NULL) {
25		memset(ret, 0, size);
26		*dma_handle = virt_to_phys(ret);
27	}
28	return ret;
29}
30
31void dma_free_coherent(struct device *dev, size_t size,
32			 void *vaddr, dma_addr_t dma_handle)
33{
34	free_pages((unsigned long)vaddr, get_order(size));
35}
36