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>
16 #include <asm/pgalloc.h>
18 void *dma_alloc_coherent(struct device *dev, size_t size,
19 dma_addr_t *handle, gfp_t flag)
21 struct page *page, **map;
26 pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
28 size = PAGE_ALIGN(size);
29 order = get_order(size);
31 page = alloc_pages(flag, order);
35 *handle = page_to_phys(page);
36 map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
38 __free_pages(page, order);
41 split_page(page, order);
46 for (i = 1; i < size; i++)
48 for (; i < order; i++)
49 __free_page(page + i);
50 pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
51 if (CPU_IS_040_OR_060)
52 pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
54 pgprot_val(pgprot) |= _PAGE_NOCACHE030;
55 addr = vmap(map, size, VM_MAP, pgprot);
60 EXPORT_SYMBOL(dma_alloc_coherent);
62 void dma_free_coherent(struct device *dev, size_t size,
63 void *addr, dma_addr_t handle)
65 pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
68 EXPORT_SYMBOL(dma_free_coherent);
70 void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
71 size_t size, enum dma_data_direction dir)
75 cache_push(handle, size);
78 cache_clear(handle, size);
81 if (printk_ratelimit())
82 printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
86 EXPORT_SYMBOL(dma_sync_single_for_device);
88 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
89 enum dma_data_direction dir)
93 for (i = 0; i < nents; sg++, i++)
94 dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
96 EXPORT_SYMBOL(dma_sync_sg_for_device);
98 dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
99 enum dma_data_direction dir)
101 dma_addr_t handle = virt_to_bus(addr);
103 dma_sync_single_for_device(dev, handle, size, dir);
106 EXPORT_SYMBOL(dma_map_single);
108 dma_addr_t dma_map_page(struct device *dev, struct page *page,
109 unsigned long offset, size_t size,
110 enum dma_data_direction dir)
112 dma_addr_t handle = page_to_phys(page) + offset;
114 dma_sync_single_for_device(dev, handle, size, dir);
117 EXPORT_SYMBOL(dma_map_page);
119 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
120 enum dma_data_direction dir)
124 for (i = 0; i < nents; sg++, i++) {
125 sg->dma_address = sg_phys(sg);
126 dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
130 EXPORT_SYMBOL(dma_map_sg);