2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file COPYING in the main directory of this archive
9 #include <linux/dma-mapping.h>
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/scatterlist.h>
13 #include <linux/slab.h>
14 #include <linux/vmalloc.h>
15 #include <linux/export.h>
17 #include <asm/pgalloc.h>
21 void *dma_alloc_coherent(struct device *dev, size_t size,
22 dma_addr_t *handle, gfp_t flag)
24 struct page *page, **map;
29 pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
31 size = PAGE_ALIGN(size);
32 order = get_order(size);
34 page = alloc_pages(flag, order);
38 *handle = page_to_phys(page);
39 map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
41 __free_pages(page, order);
44 split_page(page, order);
49 for (i = 1; i < size; i++)
51 for (; i < order; i++)
52 __free_page(page + i);
53 pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
54 if (CPU_IS_040_OR_060)
55 pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
57 pgprot_val(pgprot) |= _PAGE_NOCACHE030;
58 addr = vmap(map, size, VM_MAP, pgprot);
64 void dma_free_coherent(struct device *dev, size_t size,
65 void *addr, dma_addr_t handle)
67 pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
73 #include <asm/cacheflush.h>
75 void *dma_alloc_coherent(struct device *dev, size_t size,
76 dma_addr_t *dma_handle, gfp_t gfp)
79 /* ignore region specifiers */
80 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
82 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
84 ret = (void *)__get_free_pages(gfp, get_order(size));
88 *dma_handle = virt_to_phys(ret);
93 void dma_free_coherent(struct device *dev, size_t size,
94 void *vaddr, dma_addr_t dma_handle)
96 free_pages((unsigned long)vaddr, get_order(size));
99 #endif /* CONFIG_MMU */
101 EXPORT_SYMBOL(dma_alloc_coherent);
102 EXPORT_SYMBOL(dma_free_coherent);
104 void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
105 size_t size, enum dma_data_direction dir)
109 cache_push(handle, size);
111 case DMA_FROM_DEVICE:
112 cache_clear(handle, size);
115 if (printk_ratelimit())
116 printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
120 EXPORT_SYMBOL(dma_sync_single_for_device);
122 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
123 enum dma_data_direction dir)
127 for (i = 0; i < nents; sg++, i++)
128 dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
130 EXPORT_SYMBOL(dma_sync_sg_for_device);
132 dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
133 enum dma_data_direction dir)
135 dma_addr_t handle = virt_to_bus(addr);
137 dma_sync_single_for_device(dev, handle, size, dir);
140 EXPORT_SYMBOL(dma_map_single);
142 dma_addr_t dma_map_page(struct device *dev, struct page *page,
143 unsigned long offset, size_t size,
144 enum dma_data_direction dir)
146 dma_addr_t handle = page_to_phys(page) + offset;
148 dma_sync_single_for_device(dev, handle, size, dir);
151 EXPORT_SYMBOL(dma_map_page);
153 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
154 enum dma_data_direction dir)
158 for (i = 0; i < nents; sg++, i++) {
159 sg->dma_address = sg_phys(sg);
160 dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
164 EXPORT_SYMBOL(dma_map_sg);