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5641686c GU |
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/scatterlist.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/vmalloc.h> | |
15 | #include <linux/export.h> | |
16 | ||
17 | #include <asm/pgalloc.h> | |
18 | ||
b60f187f | 19 | #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) |
5641686c GU |
20 | |
21 | void *dma_alloc_coherent(struct device *dev, size_t size, | |
22 | dma_addr_t *handle, gfp_t flag) | |
23 | { | |
24 | struct page *page, **map; | |
25 | pgprot_t pgprot; | |
26 | void *addr; | |
27 | int i, order; | |
28 | ||
29 | pr_debug("dma_alloc_coherent: %d,%x\n", size, flag); | |
30 | ||
31 | size = PAGE_ALIGN(size); | |
32 | order = get_order(size); | |
33 | ||
34 | page = alloc_pages(flag, order); | |
35 | if (!page) | |
36 | return NULL; | |
37 | ||
38 | *handle = page_to_phys(page); | |
39 | map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA); | |
40 | if (!map) { | |
41 | __free_pages(page, order); | |
42 | return NULL; | |
43 | } | |
44 | split_page(page, order); | |
45 | ||
46 | order = 1 << order; | |
47 | size >>= PAGE_SHIFT; | |
48 | map[0] = page; | |
49 | for (i = 1; i < size; i++) | |
50 | map[i] = page + 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; | |
56 | else | |
57 | pgprot_val(pgprot) |= _PAGE_NOCACHE030; | |
58 | addr = vmap(map, size, VM_MAP, pgprot); | |
59 | kfree(map); | |
60 | ||
61 | return addr; | |
62 | } | |
63 | ||
64 | void dma_free_coherent(struct device *dev, size_t size, | |
65 | void *addr, dma_addr_t handle) | |
66 | { | |
67 | pr_debug("dma_free_coherent: %p, %x\n", addr, handle); | |
68 | vfree(addr); | |
69 | } | |
70 | ||
66d857b0 | 71 | #else |
5641686c GU |
72 | |
73 | #include <asm/cacheflush.h> | |
74 | ||
75 | void *dma_alloc_coherent(struct device *dev, size_t size, | |
76 | dma_addr_t *dma_handle, gfp_t gfp) | |
77 | { | |
78 | void *ret; | |
79 | /* ignore region specifiers */ | |
80 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); | |
81 | ||
82 | if (dev == NULL || (*dev->dma_mask < 0xffffffff)) | |
83 | gfp |= GFP_DMA; | |
84 | ret = (void *)__get_free_pages(gfp, get_order(size)); | |
85 | ||
86 | if (ret != NULL) { | |
87 | memset(ret, 0, size); | |
88 | *dma_handle = virt_to_phys(ret); | |
89 | } | |
90 | return ret; | |
91 | } | |
92 | ||
93 | void dma_free_coherent(struct device *dev, size_t size, | |
94 | void *vaddr, dma_addr_t dma_handle) | |
95 | { | |
96 | free_pages((unsigned long)vaddr, get_order(size)); | |
97 | } | |
98 | ||
b60f187f | 99 | #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */ |
5641686c GU |
100 | |
101 | EXPORT_SYMBOL(dma_alloc_coherent); | |
102 | EXPORT_SYMBOL(dma_free_coherent); | |
103 | ||
104 | void dma_sync_single_for_device(struct device *dev, dma_addr_t handle, | |
105 | size_t size, enum dma_data_direction dir) | |
106 | { | |
107 | switch (dir) { | |
d2661c62 | 108 | case DMA_BIDIRECTIONAL: |
5641686c GU |
109 | case DMA_TO_DEVICE: |
110 | cache_push(handle, size); | |
111 | break; | |
112 | case DMA_FROM_DEVICE: | |
113 | cache_clear(handle, size); | |
114 | break; | |
115 | default: | |
116 | if (printk_ratelimit()) | |
117 | printk("dma_sync_single_for_device: unsupported dir %u\n", dir); | |
118 | break; | |
119 | } | |
120 | } | |
121 | EXPORT_SYMBOL(dma_sync_single_for_device); | |
122 | ||
123 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents, | |
124 | enum dma_data_direction dir) | |
125 | { | |
126 | int i; | |
127 | ||
128 | for (i = 0; i < nents; sg++, i++) | |
129 | dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir); | |
130 | } | |
131 | EXPORT_SYMBOL(dma_sync_sg_for_device); | |
132 | ||
133 | dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size, | |
134 | enum dma_data_direction dir) | |
135 | { | |
136 | dma_addr_t handle = virt_to_bus(addr); | |
137 | ||
138 | dma_sync_single_for_device(dev, handle, size, dir); | |
139 | return handle; | |
140 | } | |
141 | EXPORT_SYMBOL(dma_map_single); | |
142 | ||
143 | dma_addr_t dma_map_page(struct device *dev, struct page *page, | |
144 | unsigned long offset, size_t size, | |
145 | enum dma_data_direction dir) | |
146 | { | |
147 | dma_addr_t handle = page_to_phys(page) + offset; | |
148 | ||
149 | dma_sync_single_for_device(dev, handle, size, dir); | |
150 | return handle; | |
151 | } | |
152 | EXPORT_SYMBOL(dma_map_page); | |
153 | ||
154 | int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, | |
155 | enum dma_data_direction dir) | |
156 | { | |
157 | int i; | |
158 | ||
159 | for (i = 0; i < nents; sg++, i++) { | |
160 | sg->dma_address = sg_phys(sg); | |
161 | dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir); | |
162 | } | |
163 | return nents; | |
164 | } | |
165 | EXPORT_SYMBOL(dma_map_sg); |