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1da177e4 LT |
1 | /* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs |
2 | * | |
3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/types.h> | |
1da177e4 LT |
13 | #include <linux/dma-mapping.h> |
14 | #include <linux/list.h> | |
15 | #include <linux/pci.h> | |
16 | #include <linux/highmem.h> | |
9e6a76b8 | 17 | #include <linux/scatterlist.h> |
1da177e4 LT |
18 | #include <asm/io.h> |
19 | ||
a5da7d3c | 20 | void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp) |
1da177e4 LT |
21 | { |
22 | void *ret; | |
23 | ||
24 | ret = consistent_alloc(gfp, size, dma_handle); | |
25 | if (ret) | |
26 | memset(ret, 0, size); | |
27 | ||
28 | return ret; | |
29 | } | |
30 | ||
40234401 DH |
31 | EXPORT_SYMBOL(dma_alloc_coherent); |
32 | ||
1da177e4 LT |
33 | void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle) |
34 | { | |
35 | consistent_free(vaddr); | |
36 | } | |
37 | ||
40234401 DH |
38 | EXPORT_SYMBOL(dma_free_coherent); |
39 | ||
1da177e4 LT |
40 | dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, |
41 | enum dma_data_direction direction) | |
42 | { | |
db5c444e | 43 | BUG_ON(direction == DMA_NONE); |
1da177e4 LT |
44 | |
45 | frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size); | |
46 | ||
47 | return virt_to_bus(ptr); | |
48 | } | |
49 | ||
40234401 DH |
50 | EXPORT_SYMBOL(dma_map_single); |
51 | ||
1da177e4 LT |
52 | int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
53 | enum dma_data_direction direction) | |
54 | { | |
55 | unsigned long dampr2; | |
56 | void *vaddr; | |
57 | int i; | |
58 | ||
db5c444e | 59 | BUG_ON(direction == DMA_NONE); |
1da177e4 LT |
60 | |
61 | dampr2 = __get_DAMPR(2); | |
62 | ||
63 | for (i = 0; i < nents; i++) { | |
9e6a76b8 | 64 | vaddr = kmap_atomic(sg_page(&sg[i]), __KM_CACHE); |
1da177e4 LT |
65 | |
66 | frv_dcache_writeback((unsigned long) vaddr, | |
67 | (unsigned long) vaddr + PAGE_SIZE); | |
68 | ||
69 | } | |
70 | ||
71 | kunmap_atomic(vaddr, __KM_CACHE); | |
72 | if (dampr2) { | |
73 | __set_DAMPR(2, dampr2); | |
74 | __set_IAMPR(2, dampr2); | |
75 | } | |
76 | ||
77 | return nents; | |
78 | } | |
79 | ||
40234401 DH |
80 | EXPORT_SYMBOL(dma_map_sg); |
81 | ||
1da177e4 LT |
82 | dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, |
83 | size_t size, enum dma_data_direction direction) | |
84 | { | |
85 | BUG_ON(direction == DMA_NONE); | |
86 | flush_dcache_page(page); | |
87 | return (dma_addr_t) page_to_phys(page) + offset; | |
88 | } | |
40234401 DH |
89 | |
90 | EXPORT_SYMBOL(dma_map_page); |