RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / arch / m68knommu / kernel / dma.c
blob0a25874a2aaefb5c4a4821688086c075a2e00532
1 /*
2 * Dynamic DMA mapping support.
4 * We never have any address translations to worry about, so this
5 * is just alloc/free.
6 */
8 #include <linux/types.h>
9 #include <linux/mm.h>
10 #include <linux/string.h>
11 #include <asm/io.h>
13 void *dma_alloc_coherent(struct device *dev, size_t size,
14 dma_addr_t *dma_handle, int gfp)
16 void *ret;
17 /* ignore region specifiers */
18 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
20 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
21 gfp |= GFP_DMA;
22 ret = (void *)__get_free_pages(gfp, get_order(size));
24 if (ret != NULL) {
25 memset(ret, 0, size);
26 *dma_handle = virt_to_phys(ret);
28 return ret;
31 void dma_free_coherent(struct device *dev, size_t size,
32 void *vaddr, dma_addr_t dma_handle)
34 free_pages((unsigned long)vaddr, get_order(size));