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>
19 void *dma_alloc_coherent(struct device *dev, size_t size,
20 dma_addr_t *handle, gfp_t flag)
22 struct page *page, **map;
27 pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
29 size = PAGE_ALIGN(size);
30 order = get_order(size);
32 page = alloc_pages(flag, order);
36 *handle = page_to_phys(page);
37 map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
39 __free_pages(page, order);
42 split_page(page, order);
47 for (i = 1; i < size; i++)
49 for (; i < order; i++)
50 __free_page(page + i);
51 pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
52 if (CPU_IS_040_OR_060)
53 pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
55 pgprot_val(pgprot) |= _PAGE_NOCACHE030;
56 addr = vmap(map, size, VM_MAP, pgprot);
61 EXPORT_SYMBOL(dma_alloc_coherent);
63 void dma_free_coherent(struct device *dev, size_t size,
64 void *addr, dma_addr_t handle)
66 pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
69 EXPORT_SYMBOL(dma_free_coherent);
71 void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
72 size_t size, enum dma_data_direction dir)
76 cache_push(handle, size);
79 cache_clear(handle, size);
82 if (printk_ratelimit())
83 printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
87 EXPORT_SYMBOL(dma_sync_single_for_device);
89 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
90 enum dma_data_direction dir)
94 for (i = 0; i < nents; sg++, i++)
95 dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
97 EXPORT_SYMBOL(dma_sync_sg_for_device);
99 dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
100 enum dma_data_direction dir)
102 dma_addr_t handle = virt_to_bus(addr);
104 dma_sync_single_for_device(dev, handle, size, dir);
107 EXPORT_SYMBOL(dma_map_single);
109 dma_addr_t dma_map_page(struct device *dev, struct page *page,
110 unsigned long offset, size_t size,
111 enum dma_data_direction dir)
113 dma_addr_t handle = page_to_phys(page) + offset;
115 dma_sync_single_for_device(dev, handle, size, dir);
118 EXPORT_SYMBOL(dma_map_page);
120 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
121 enum dma_data_direction dir)
125 for (i = 0; i < nents; sg++, i++) {
126 sg->dma_address = sg_phys(sg);
127 dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
131 EXPORT_SYMBOL(dma_map_sg);