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/*
 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 <asm/io.h>
25#include <asm/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);