2 * Dynamic DMA mapping support.
4 * We never have any address translations to worry about, so this
8 #include <linux/types.h>
11 #include <linux/device.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/export.h>
14 #include <asm/cacheflush.h>
16 void *dma_alloc_coherent(struct device *dev, size_t size,
17 dma_addr_t *dma_handle, gfp_t gfp)
20 /* ignore region specifiers */
21 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
23 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
25 ret = (void *)__get_free_pages(gfp, get_order(size));
29 *dma_handle = virt_to_phys(ret);
34 void dma_free_coherent(struct device *dev, size_t size,
35 void *vaddr, dma_addr_t dma_handle)
37 free_pages((unsigned long)vaddr, get_order(size));
40 void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
41 size_t size, enum dma_data_direction dir)
45 flush_dcache_range(handle, size);
48 /* Should be clear already */
51 if (printk_ratelimit())
52 printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
57 EXPORT_SYMBOL(dma_sync_single_for_device);
58 dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
59 enum dma_data_direction dir)
61 dma_addr_t handle = virt_to_phys(addr);
62 flush_dcache_range(handle, size);
65 EXPORT_SYMBOL(dma_map_single);
67 dma_addr_t dma_map_page(struct device *dev, struct page *page,
68 unsigned long offset, size_t size,
69 enum dma_data_direction dir)
71 dma_addr_t handle = page_to_phys(page) + offset;
72 dma_sync_single_for_device(dev, handle, size, dir);
75 EXPORT_SYMBOL(dma_map_page);