Roman Zippel | b035c96 | 2006-06-25 05:46:56 -0700 | [diff] [blame] | 1 | /* |
| 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 |
| 4 | * for more details. |
| 5 | */ |
| 6 | |
| 7 | #undef DEBUG |
| 8 | |
| 9 | #include <linux/dma-mapping.h> |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/vmalloc.h> |
| 13 | |
| 14 | #include <asm/pgalloc.h> |
| 15 | #include <asm/scatterlist.h> |
| 16 | |
| 17 | void *dma_alloc_coherent(struct device *dev, size_t size, |
Al Viro | dc36670 | 2006-10-06 00:43:58 -0700 | [diff] [blame] | 18 | dma_addr_t *handle, gfp_t flag) |
Roman Zippel | b035c96 | 2006-06-25 05:46:56 -0700 | [diff] [blame] | 19 | { |
| 20 | struct page *page, **map; |
| 21 | pgprot_t pgprot; |
| 22 | void *addr; |
| 23 | int i, order; |
| 24 | |
| 25 | pr_debug("dma_alloc_coherent: %d,%x\n", size, flag); |
| 26 | |
| 27 | size = PAGE_ALIGN(size); |
| 28 | order = get_order(size); |
| 29 | |
| 30 | page = alloc_pages(flag, order); |
| 31 | if (!page) |
| 32 | return NULL; |
| 33 | |
| 34 | *handle = page_to_phys(page); |
| 35 | map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA); |
| 36 | if (!map) { |
| 37 | __free_pages(page, order); |
| 38 | return NULL; |
| 39 | } |
| 40 | split_page(page, order); |
| 41 | |
| 42 | order = 1 << order; |
| 43 | size >>= PAGE_SHIFT; |
| 44 | map[0] = page; |
| 45 | for (i = 1; i < size; i++) |
| 46 | map[i] = page + i; |
| 47 | for (; i < order; i++) |
| 48 | __free_page(page + i); |
| 49 | pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY); |
| 50 | if (CPU_IS_040_OR_060) |
| 51 | pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S; |
| 52 | else |
| 53 | pgprot_val(pgprot) |= _PAGE_NOCACHE030; |
Al Viro | dc36670 | 2006-10-06 00:43:58 -0700 | [diff] [blame] | 54 | addr = vmap(map, size, VM_MAP, pgprot); |
Roman Zippel | b035c96 | 2006-06-25 05:46:56 -0700 | [diff] [blame] | 55 | kfree(map); |
| 56 | |
| 57 | return addr; |
| 58 | } |
| 59 | EXPORT_SYMBOL(dma_alloc_coherent); |
| 60 | |
| 61 | void dma_free_coherent(struct device *dev, size_t size, |
| 62 | void *addr, dma_addr_t handle) |
| 63 | { |
| 64 | pr_debug("dma_free_coherent: %p, %x\n", addr, handle); |
| 65 | vfree(addr); |
| 66 | } |
| 67 | EXPORT_SYMBOL(dma_free_coherent); |
| 68 | |
| 69 | inline void dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size, |
| 70 | enum dma_data_direction dir) |
| 71 | { |
| 72 | switch (dir) { |
| 73 | case DMA_TO_DEVICE: |
| 74 | cache_push(handle, size); |
| 75 | break; |
| 76 | case DMA_FROM_DEVICE: |
| 77 | cache_clear(handle, size); |
| 78 | break; |
| 79 | default: |
| 80 | if (printk_ratelimit()) |
| 81 | printk("dma_sync_single_for_device: unsupported dir %u\n", dir); |
| 82 | break; |
| 83 | } |
| 84 | } |
| 85 | EXPORT_SYMBOL(dma_sync_single_for_device); |
| 86 | |
| 87 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents, |
| 88 | enum dma_data_direction dir) |
| 89 | { |
| 90 | int i; |
| 91 | |
| 92 | for (i = 0; i < nents; sg++, i++) |
| 93 | dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir); |
| 94 | } |
| 95 | EXPORT_SYMBOL(dma_sync_sg_for_device); |
| 96 | |
| 97 | dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size, |
| 98 | enum dma_data_direction dir) |
| 99 | { |
| 100 | dma_addr_t handle = virt_to_bus(addr); |
| 101 | |
| 102 | dma_sync_single_for_device(dev, handle, size, dir); |
| 103 | return handle; |
| 104 | } |
| 105 | EXPORT_SYMBOL(dma_map_single); |
| 106 | |
| 107 | dma_addr_t dma_map_page(struct device *dev, struct page *page, |
| 108 | unsigned long offset, size_t size, |
| 109 | enum dma_data_direction dir) |
| 110 | { |
| 111 | dma_addr_t handle = page_to_phys(page) + offset; |
| 112 | |
| 113 | dma_sync_single_for_device(dev, handle, size, dir); |
| 114 | return handle; |
| 115 | } |
| 116 | EXPORT_SYMBOL(dma_map_page); |
| 117 | |
| 118 | int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 119 | enum dma_data_direction dir) |
| 120 | { |
| 121 | int i; |
| 122 | |
| 123 | for (i = 0; i < nents; sg++, i++) { |
| 124 | sg->dma_address = page_to_phys(sg->page) + sg->offset; |
| 125 | dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir); |
| 126 | } |
| 127 | return nents; |
| 128 | } |
| 129 | EXPORT_SYMBOL(dma_map_sg); |