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
13/**
14 * 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 *
21 * Return: Zero if successful, or non-zero on failure.
22 */
23int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
24{
25#if defined(__i386__) || defined(CONFIG_SPARC32)
26	return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
27#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}
43EXPORT_SYMBOL(copy_to_user_fromio);
44
45/**
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 *
53 * Return: Zero if successful, or non-zero on failure.
54 */
55int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
56{
57#if defined(__i386__) || defined(CONFIG_SPARC32)
58	return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
59#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}
75EXPORT_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
13/**
14 * 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 *
21 * Return: Zero if successful, or non-zero on failure.
22 */
23int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
24{
25#if defined(__i386__) || defined(CONFIG_SPARC32)
26	return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
27#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}
43EXPORT_SYMBOL(copy_to_user_fromio);
44
45/**
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 *
53 * Return: Zero if successful, or non-zero on failure.
54 */
55int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
56{
57#if defined(__i386__) || defined(CONFIG_SPARC32)
58	return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
59#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}
75EXPORT_SYMBOL(copy_from_user_toio);