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// SPDX-License-Identifier: GPL-2.0-only
/*
* Based on arch/arm/kernel/io.c
*
* Copyright (C) 2012 ARM Ltd.
*/
#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, 8)) {
*(u8 *)to = __raw_readb(from);
from++;
to++;
count--;
}
while (count >= 8) {
*(u64 *)to = __raw_readq(from);
from += 8;
to += 8;
count -= 8;
}
while (count) {
*(u8 *)to = __raw_readb(from);
from++;
to++;
count--;
}
}
EXPORT_SYMBOL(__memcpy_fromio);
/*
* This generates a memcpy that works on a from/to address which is aligned to
* bits. Count is in terms of the number of bits sized quantities to copy. It
* optimizes to use the STR groupings when possible so that it is WC friendly.
*/
#define memcpy_toio_aligned(to, from, count, bits) \
({ \
volatile u##bits __iomem *_to = to; \
const u##bits *_from = from; \
size_t _count = count; \
const u##bits *_end_from = _from + ALIGN_DOWN(_count, 8); \
\
for (; _from < _end_from; _from += 8, _to += 8) \
__const_memcpy_toio_aligned##bits(_to, _from, 8); \
if ((_count % 8) >= 4) { \
__const_memcpy_toio_aligned##bits(_to, _from, 4); \
_from += 4; \
_to += 4; \
} \
if ((_count % 4) >= 2) { \
__const_memcpy_toio_aligned##bits(_to, _from, 2); \
_from += 2; \
_to += 2; \
} \
if (_count % 2) \
__const_memcpy_toio_aligned##bits(_to, _from, 1); \
})
void __iowrite64_copy_full(void __iomem *to, const void *from, size_t count)
{
memcpy_toio_aligned(to, from, count, 64);
dgh();
}
EXPORT_SYMBOL(__iowrite64_copy_full);
void __iowrite32_copy_full(void __iomem *to, const void *from, size_t count)
{
memcpy_toio_aligned(to, from, count, 32);
dgh();
}
EXPORT_SYMBOL(__iowrite32_copy_full);
/*
* 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, 8)) {
__raw_writeb(*(u8 *)from, to);
from++;
to++;
count--;
}
while (count >= 8) {
__raw_writeq(*(u64 *)from, to);
from += 8;
to += 8;
count -= 8;
}
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)
{
u64 qc = (u8)c;
qc |= qc << 8;
qc |= qc << 16;
qc |= qc << 32;
while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
__raw_writeb(c, dst);
dst++;
count--;
}
while (count >= 8) {
__raw_writeq(qc, dst);
dst += 8;
count -= 8;
}
while (count) {
__raw_writeb(c, dst);
dst++;
count--;
}
}
EXPORT_SYMBOL(__memset_io);
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