Commit | Line | Data |
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1da177e4 | 1 | /* |
c1017a4c | 2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 | 3 | * |
e38e0cfa | 4 | * Misc memory accessors |
1da177e4 LT |
5 | * |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | */ | |
22 | ||
d81a6d71 | 23 | #include <linux/export.h> |
1da177e4 LT |
24 | #include <asm/io.h> |
25 | #include <asm/uaccess.h> | |
9004acc7 | 26 | #include <sound/core.h> |
1da177e4 | 27 | |
1da177e4 LT |
28 | /** |
29 | * copy_to_user_fromio - copy data from mmio-space to user-space | |
30 | * @dst: the destination pointer on user-space | |
31 | * @src: the source pointer on mmio | |
32 | * @count: the data size to copy in bytes | |
33 | * | |
34 | * Copies the data from mmio-space to user-space. | |
35 | * | |
eb7c06e8 | 36 | * Return: Zero if successful, or non-zero on failure. |
1da177e4 LT |
37 | */ |
38 | int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count) | |
39 | { | |
40 | #if defined(__i386__) || defined(CONFIG_SPARC32) | |
4d23359b | 41 | return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0; |
1da177e4 LT |
42 | #else |
43 | char buf[256]; | |
44 | while (count) { | |
45 | size_t c = count; | |
46 | if (c > sizeof(buf)) | |
47 | c = sizeof(buf); | |
48 | memcpy_fromio(buf, (void __iomem *)src, c); | |
49 | if (copy_to_user(dst, buf, c)) | |
50 | return -EFAULT; | |
51 | count -= c; | |
52 | dst += c; | |
53 | src += c; | |
54 | } | |
55 | return 0; | |
56 | #endif | |
57 | } | |
58 | ||
c0d3fb39 TI |
59 | EXPORT_SYMBOL(copy_to_user_fromio); |
60 | ||
1da177e4 LT |
61 | /** |
62 | * copy_from_user_toio - copy data from user-space to mmio-space | |
63 | * @dst: the destination pointer on mmio-space | |
64 | * @src: the source pointer on user-space | |
65 | * @count: the data size to copy in bytes | |
66 | * | |
67 | * Copies the data from user-space to mmio-space. | |
68 | * | |
eb7c06e8 | 69 | * Return: Zero if successful, or non-zero on failure. |
1da177e4 LT |
70 | */ |
71 | int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count) | |
72 | { | |
73 | #if defined(__i386__) || defined(CONFIG_SPARC32) | |
4d23359b | 74 | return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0; |
1da177e4 LT |
75 | #else |
76 | char buf[256]; | |
77 | while (count) { | |
78 | size_t c = count; | |
79 | if (c > sizeof(buf)) | |
80 | c = sizeof(buf); | |
81 | if (copy_from_user(buf, src, c)) | |
82 | return -EFAULT; | |
83 | memcpy_toio(dst, buf, c); | |
84 | count -= c; | |
85 | dst += c; | |
86 | src += c; | |
87 | } | |
88 | return 0; | |
89 | #endif | |
90 | } | |
c0d3fb39 TI |
91 | |
92 | EXPORT_SYMBOL(copy_from_user_toio); |