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1/*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 *
4 * Misc memory accessors
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
23#include <linux/export.h>
24#include <linux/io.h>
25#include <linux/uaccess.h>
26#include <sound/core.h>
27
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 *
36 * Return: Zero if successful, or non-zero on failure.
37 */
38int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
39{
40#if defined(__i386__) || defined(CONFIG_SPARC32)
41 return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
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
59EXPORT_SYMBOL(copy_to_user_fromio);
60
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 *
69 * Return: Zero if successful, or non-zero on failure.
70 */
71int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
72{
73#if defined(__i386__) || defined(CONFIG_SPARC32)
74 return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
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}
91
92EXPORT_SYMBOL(copy_from_user_toio);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 * Misc memory accessors
6 */
7
8#include <linux/export.h>
9#include <linux/io.h>
10#include <linux/uaccess.h>
11#include <sound/core.h>
12#include <sound/pcm.h>
13
14/**
15 * copy_to_user_fromio - copy data from mmio-space to user-space
16 * @dst: the destination pointer on user-space
17 * @src: the source pointer on mmio
18 * @count: the data size to copy in bytes
19 *
20 * Copies the data from mmio-space to user-space.
21 *
22 * Return: Zero if successful, or non-zero on failure.
23 */
24int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
25{
26 struct iov_iter iter;
27
28 if (import_ubuf(ITER_DEST, dst, count, &iter))
29 return -EFAULT;
30 return copy_to_iter_fromio(&iter, (const void __iomem *)src, count);
31}
32EXPORT_SYMBOL(copy_to_user_fromio);
33
34/**
35 * copy_to_iter_fromio - copy data from mmio-space to iov_iter
36 * @dst: the destination iov_iter
37 * @src: the source pointer on mmio
38 * @count: the data size to copy in bytes
39 *
40 * Copies the data from mmio-space to iov_iter.
41 *
42 * Return: Zero if successful, or non-zero on failure.
43 */
44int copy_to_iter_fromio(struct iov_iter *dst, const void __iomem *src,
45 size_t count)
46{
47#if defined(__i386__) || defined(CONFIG_SPARC32)
48 return copy_to_iter((const void __force *)src, count, dst) == count ? 0 : -EFAULT;
49#else
50 char buf[256];
51 while (count) {
52 size_t c = count;
53 if (c > sizeof(buf))
54 c = sizeof(buf);
55 memcpy_fromio(buf, (void __iomem *)src, c);
56 if (copy_to_iter(buf, c, dst) != c)
57 return -EFAULT;
58 count -= c;
59 src += c;
60 }
61 return 0;
62#endif
63}
64EXPORT_SYMBOL(copy_to_iter_fromio);
65
66/**
67 * copy_from_user_toio - copy data from user-space to mmio-space
68 * @dst: the destination pointer on mmio-space
69 * @src: the source pointer on user-space
70 * @count: the data size to copy in bytes
71 *
72 * Copies the data from user-space to mmio-space.
73 *
74 * Return: Zero if successful, or non-zero on failure.
75 */
76int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
77{
78 struct iov_iter iter;
79
80 if (import_ubuf(ITER_SOURCE, (void __user *)src, count, &iter))
81 return -EFAULT;
82 return copy_from_iter_toio((void __iomem *)dst, &iter, count);
83}
84EXPORT_SYMBOL(copy_from_user_toio);
85
86/**
87 * copy_from_iter_toio - copy data from iov_iter to mmio-space
88 * @dst: the destination pointer on mmio-space
89 * @src: the source iov_iter
90 * @count: the data size to copy in bytes
91 *
92 * Copies the data from iov_iter to mmio-space.
93 *
94 * Return: Zero if successful, or non-zero on failure.
95 */
96int copy_from_iter_toio(void __iomem *dst, struct iov_iter *src, size_t count)
97{
98#if defined(__i386__) || defined(CONFIG_SPARC32)
99 return copy_from_iter((void __force *)dst, count, src) == count ? 0 : -EFAULT;
100#else
101 char buf[256];
102 while (count) {
103 size_t c = count;
104 if (c > sizeof(buf))
105 c = sizeof(buf);
106 if (copy_from_iter(buf, c, src) != c)
107 return -EFAULT;
108 memcpy_toio(dst, buf, c);
109 count -= c;
110 dst += c;
111 }
112 return 0;
113#endif
114}
115EXPORT_SYMBOL(copy_from_iter_toio);