NFSv4.1/flexfiles: Fix a protocol error in layoutreturn
[linux/fpc-iii.git] / arch / m68k / kernel / dma.c
blob564665f9af30c9e1da180b20f5176a2b1c0e9731
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 */
7 #undef DEBUG
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 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
21 void *dma_alloc_coherent(struct device *dev, size_t size,
22 dma_addr_t *handle, gfp_t flag)
24 struct page *page, **map;
25 pgprot_t pgprot;
26 void *addr;
27 int i, order;
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);
35 if (!page)
36 return NULL;
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;
44 split_page(page, order);
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);
61 return addr;
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);
68 vfree(addr);
71 #else
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)
78 void *ret;
79 /* ignore region specifiers */
80 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
82 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
83 gfp |= GFP_DMA;
84 ret = (void *)__get_free_pages(gfp, get_order(size));
86 if (ret != NULL) {
87 memset(ret, 0, size);
88 *dma_handle = virt_to_phys(ret);
90 return 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 && !CONFIG_COLDFIRE */
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)
107 switch (dir) {
108 case DMA_BIDIRECTIONAL:
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;
121 EXPORT_SYMBOL(dma_sync_single_for_device);
123 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
124 int nents, enum dma_data_direction dir)
126 int i;
127 struct scatterlist *sg;
129 for_each_sg(sglist, sg, nents, i) {
130 dma_sync_single_for_device(dev, sg->dma_address, sg->length,
131 dir);
134 EXPORT_SYMBOL(dma_sync_sg_for_device);
136 dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
137 enum dma_data_direction dir)
139 dma_addr_t handle = virt_to_bus(addr);
141 dma_sync_single_for_device(dev, handle, size, dir);
142 return handle;
144 EXPORT_SYMBOL(dma_map_single);
146 dma_addr_t dma_map_page(struct device *dev, struct page *page,
147 unsigned long offset, size_t size,
148 enum dma_data_direction dir)
150 dma_addr_t handle = page_to_phys(page) + offset;
152 dma_sync_single_for_device(dev, handle, size, dir);
153 return handle;
155 EXPORT_SYMBOL(dma_map_page);
157 int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
158 enum dma_data_direction dir)
160 int i;
161 struct scatterlist *sg;
163 for_each_sg(sglist, sg, nents, i) {
164 sg->dma_address = sg_phys(sg);
165 dma_sync_single_for_device(dev, sg->dma_address, sg->length,
166 dir);
168 return nents;
170 EXPORT_SYMBOL(dma_map_sg);