53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
// 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>
|
|
|
|
/*
|
|
* 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);
|