92 lines
1.5 KiB
C
92 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/types.h>
|
|
#include <linux/io.h>
|
|
|
|
/*
|
|
* Copy data from IO memory space to "real" memory space.
|
|
*/
|
|
void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
|
|
{
|
|
while (count && !IS_ALIGNED((unsigned long)from, 4)) {
|
|
*(u8 *)to = __raw_readb(from);
|
|
from++;
|
|
to++;
|
|
count--;
|
|
}
|
|
|
|
while (count >= 4) {
|
|
*(u32 *)to = __raw_readl(from);
|
|
from += 4;
|
|
to += 4;
|
|
count -= 4;
|
|
}
|
|
|
|
while (count) {
|
|
*(u8 *)to = __raw_readb(from);
|
|
from++;
|
|
to++;
|
|
count--;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(__memcpy_fromio);
|
|
|
|
/*
|
|
* Copy data from "real" memory space to IO memory space.
|
|
*/
|
|
void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
|
|
{
|
|
while (count && !IS_ALIGNED((unsigned long)to, 4)) {
|
|
__raw_writeb(*(u8 *)from, to);
|
|
from++;
|
|
to++;
|
|
count--;
|
|
}
|
|
|
|
while (count >= 4) {
|
|
__raw_writel(*(u32 *)from, to);
|
|
from += 4;
|
|
to += 4;
|
|
count -= 4;
|
|
}
|
|
|
|
while (count) {
|
|
__raw_writeb(*(u8 *)from, to);
|
|
from++;
|
|
to++;
|
|
count--;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(__memcpy_toio);
|
|
|
|
/*
|
|
* "memset" on IO memory space.
|
|
*/
|
|
void __memset_io(volatile void __iomem *dst, int c, size_t count)
|
|
{
|
|
u32 qc = (u8)c;
|
|
|
|
qc |= qc << 8;
|
|
qc |= qc << 16;
|
|
|
|
while (count && !IS_ALIGNED((unsigned long)dst, 4)) {
|
|
__raw_writeb(c, dst);
|
|
dst++;
|
|
count--;
|
|
}
|
|
|
|
while (count >= 4) {
|
|
__raw_writel(qc, dst);
|
|
dst += 4;
|
|
count -= 4;
|
|
}
|
|
|
|
while (count) {
|
|
__raw_writeb(c, dst);
|
|
dst++;
|
|
count--;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(__memset_io);
|