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Thomas Gleixner1a59d1b82019-05-27 08:55:05 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Takashi Iwaie38e0cf2005-10-10 11:59:52 +02005 * Misc memory accessors
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 */
7
Paul Gortmakerd81a6d72011-09-22 09:34:58 -04008#include <linux/export.h>
Takashi Iwai6cbbfe12015-01-28 16:49:33 +01009#include <linux/io.h>
Takashi Iwai976412f2015-01-28 17:24:43 +010010#include <linux/uaccess.h>
Takashi Iwai9004acc2008-01-08 18:13:27 +010011#include <sound/core.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
13/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * copy_to_user_fromio - copy data from mmio-space to user-space
15 * @dst: the destination pointer on user-space
16 * @src: the source pointer on mmio
17 * @count: the data size to copy in bytes
18 *
19 * Copies the data from mmio-space to user-space.
20 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +010021 * Return: Zero if successful, or non-zero on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 */
23int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
24{
25#if defined(__i386__) || defined(CONFIG_SPARC32)
Clemens Ladisch4d233592005-09-05 10:35:20 +020026 return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#else
28 char buf[256];
29 while (count) {
30 size_t c = count;
31 if (c > sizeof(buf))
32 c = sizeof(buf);
33 memcpy_fromio(buf, (void __iomem *)src, c);
34 if (copy_to_user(dst, buf, c))
35 return -EFAULT;
36 count -= c;
37 dst += c;
38 src += c;
39 }
40 return 0;
41#endif
42}
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020043EXPORT_SYMBOL(copy_to_user_fromio);
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045/**
46 * copy_from_user_toio - copy data from user-space to mmio-space
47 * @dst: the destination pointer on mmio-space
48 * @src: the source pointer on user-space
49 * @count: the data size to copy in bytes
50 *
51 * Copies the data from user-space to mmio-space.
52 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +010053 * Return: Zero if successful, or non-zero on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 */
55int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
56{
57#if defined(__i386__) || defined(CONFIG_SPARC32)
Clemens Ladisch4d233592005-09-05 10:35:20 +020058 return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#else
60 char buf[256];
61 while (count) {
62 size_t c = count;
63 if (c > sizeof(buf))
64 c = sizeof(buf);
65 if (copy_from_user(buf, src, c))
66 return -EFAULT;
67 memcpy_toio(dst, buf, c);
68 count -= c;
69 dst += c;
70 src += c;
71 }
72 return 0;
73#endif
74}
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020075EXPORT_SYMBOL(copy_from_user_toio);