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1da177e4 LT |
1 | /* |
2 | * arch/sh/mm/consistent.c | |
3 | * | |
4 | * Copyright (C) 2004 Paul Mundt | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | #include <linux/mm.h> | |
11 | #include <linux/dma-mapping.h> | |
26ff6c11 PM |
12 | #include <asm/cacheflush.h> |
13 | #include <asm/addrspace.h> | |
1da177e4 LT |
14 | #include <asm/io.h> |
15 | ||
6dae2c23 | 16 | void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle) |
1da177e4 LT |
17 | { |
18 | struct page *page, *end, *free; | |
19 | void *ret; | |
20 | int order; | |
21 | ||
22 | size = PAGE_ALIGN(size); | |
23 | order = get_order(size); | |
24 | ||
25 | page = alloc_pages(gfp, order); | |
26 | if (!page) | |
27 | return NULL; | |
8dfcc9ba | 28 | split_page(page, order); |
1da177e4 LT |
29 | |
30 | ret = page_address(page); | |
833abf7f | 31 | memset(ret, 0, size); |
1da177e4 LT |
32 | *handle = virt_to_phys(ret); |
33 | ||
34 | /* | |
35 | * We must flush the cache before we pass it on to the device | |
36 | */ | |
37 | dma_cache_wback_inv(ret, size); | |
38 | ||
39 | page = virt_to_page(ret); | |
40 | free = page + (size >> PAGE_SHIFT); | |
41 | end = page + (1 << order); | |
42 | ||
43 | while (++page < end) { | |
1da177e4 LT |
44 | /* Free any unused pages */ |
45 | if (page >= free) { | |
46 | __free_page(page); | |
47 | } | |
48 | } | |
49 | ||
50 | return P2SEGADDR(ret); | |
51 | } | |
52 | ||
53 | void consistent_free(void *vaddr, size_t size) | |
54 | { | |
55 | unsigned long addr = P1SEGADDR((unsigned long)vaddr); | |
56 | struct page *page=virt_to_page(addr); | |
57 | int num_pages=(size+PAGE_SIZE-1) >> PAGE_SHIFT; | |
58 | int i; | |
59 | ||
60 | for(i=0;i<num_pages;i++) { | |
61 | __free_page((page+i)); | |
62 | } | |
63 | } | |
64 | ||
65 | void consistent_sync(void *vaddr, size_t size, int direction) | |
66 | { | |
67 | void * p1addr = (void*) P1SEGADDR((unsigned long)vaddr); | |
68 | ||
69 | switch (direction) { | |
70 | case DMA_FROM_DEVICE: /* invalidate only */ | |
71 | dma_cache_inv(p1addr, size); | |
72 | break; | |
73 | case DMA_TO_DEVICE: /* writeback only */ | |
74 | dma_cache_wback(p1addr, size); | |
75 | break; | |
76 | case DMA_BIDIRECTIONAL: /* writeback and invalidate */ | |
77 | dma_cache_wback_inv(p1addr, size); | |
78 | break; | |
79 | default: | |
80 | BUG(); | |
81 | } | |
82 | } | |
83 | ||
84 | EXPORT_SYMBOL(consistent_alloc); | |
85 | EXPORT_SYMBOL(consistent_free); | |
86 | EXPORT_SYMBOL(consistent_sync); | |
87 |