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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 David J. Mckay (david.mckay@st.com) | |
3 | * Copyright (C) 2003 Paul Mundt (lethal@linux-sh.org) | |
4 | * | |
5 | * May be copied or modified under the terms of the GNU General Public | |
6 | * License. See linux/COPYING for more information. | |
7 | * | |
8 | * Dynamic DMA mapping support. | |
9 | */ | |
10 | #include <linux/types.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/pci.h> | |
622a9edd | 14 | #include <linux/dma-mapping.h> |
749c8496 | 15 | #include <linux/module.h> |
1da177e4 LT |
16 | #include <asm/io.h> |
17 | ||
18 | void *consistent_alloc(struct pci_dev *hwdev, size_t size, | |
19 | dma_addr_t *dma_handle) | |
20 | { | |
21 | void *ret; | |
22 | int gfp = GFP_ATOMIC; | |
23 | void *vp; | |
24 | ||
25 | if (hwdev == NULL || hwdev->dma_mask != 0xffffffff) | |
26 | gfp |= GFP_DMA; | |
27 | ||
28 | ret = (void *)__get_free_pages(gfp, get_order(size)); | |
29 | ||
30 | /* now call our friend ioremap_nocache to give us an uncached area */ | |
31 | vp = ioremap_nocache(virt_to_phys(ret), size); | |
32 | ||
33 | if (vp != NULL) { | |
34 | memset(vp, 0, size); | |
75c46162 | 35 | *dma_handle = virt_to_phys(ret); |
622a9edd | 36 | dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL); |
1da177e4 LT |
37 | } |
38 | ||
39 | return vp; | |
40 | } | |
749c8496 | 41 | EXPORT_SYMBOL(consistent_alloc); |
1da177e4 LT |
42 | |
43 | void consistent_free(struct pci_dev *hwdev, size_t size, | |
44 | void *vaddr, dma_addr_t dma_handle) | |
45 | { | |
46 | void *alloc; | |
47 | ||
75c46162 | 48 | alloc = phys_to_virt((unsigned long)dma_handle); |
1da177e4 LT |
49 | free_pages((unsigned long)alloc, get_order(size)); |
50 | ||
51 | iounmap(vaddr); | |
52 | } | |
749c8496 | 53 | EXPORT_SYMBOL(consistent_free); |