76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
|
||
|
|
*
|
||
|
|
* Misc memory accessors
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/export.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/uaccess.h>
|
||
|
|
#include <sound/core.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* copy_to_user_fromio - copy data from mmio-space to user-space
|
||
|
|
* @dst: the destination pointer on user-space
|
||
|
|
* @src: the source pointer on mmio
|
||
|
|
* @count: the data size to copy in bytes
|
||
|
|
*
|
||
|
|
* Copies the data from mmio-space to user-space.
|
||
|
|
*
|
||
|
|
* Return: Zero if successful, or non-zero on failure.
|
||
|
|
*/
|
||
|
|
int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
|
||
|
|
{
|
||
|
|
#if defined(__i386__) || defined(CONFIG_SPARC32)
|
||
|
|
return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
|
||
|
|
#else
|
||
|
|
char buf[256];
|
||
|
|
while (count) {
|
||
|
|
size_t c = count;
|
||
|
|
if (c > sizeof(buf))
|
||
|
|
c = sizeof(buf);
|
||
|
|
memcpy_fromio(buf, (void __iomem *)src, c);
|
||
|
|
if (copy_to_user(dst, buf, c))
|
||
|
|
return -EFAULT;
|
||
|
|
count -= c;
|
||
|
|
dst += c;
|
||
|
|
src += c;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(copy_to_user_fromio);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* copy_from_user_toio - copy data from user-space to mmio-space
|
||
|
|
* @dst: the destination pointer on mmio-space
|
||
|
|
* @src: the source pointer on user-space
|
||
|
|
* @count: the data size to copy in bytes
|
||
|
|
*
|
||
|
|
* Copies the data from user-space to mmio-space.
|
||
|
|
*
|
||
|
|
* Return: Zero if successful, or non-zero on failure.
|
||
|
|
*/
|
||
|
|
int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
|
||
|
|
{
|
||
|
|
#if defined(__i386__) || defined(CONFIG_SPARC32)
|
||
|
|
return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
|
||
|
|
#else
|
||
|
|
char buf[256];
|
||
|
|
while (count) {
|
||
|
|
size_t c = count;
|
||
|
|
if (c > sizeof(buf))
|
||
|
|
c = sizeof(buf);
|
||
|
|
if (copy_from_user(buf, src, c))
|
||
|
|
return -EFAULT;
|
||
|
|
memcpy_toio(dst, buf, c);
|
||
|
|
count -= c;
|
||
|
|
dst += c;
|
||
|
|
src += c;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(copy_from_user_toio);
|