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/*
* Based on arch/arm/kernel/io.c
*
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/export.h>
#include <linux/types.h>
#include <linux/io.h>
#define IO_CHECK_ALIGN(v, a) ((((unsigned long)(v)) & ((a) - 1)) == 0)
/*
* 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 && (!IO_CHECK_ALIGN(from, 8) || !IO_CHECK_ALIGN(to, 8))) {
*(u8 *)to = readb_relaxed_no_log(from);
from++;
to++;
count--;
}
while (count >= 8) {
*(u64 *)to = readq_relaxed_no_log(from);
from += 8;
to += 8;
count -= 8;
}
while (count) {
*(u8 *)to = readb_relaxed_no_log(from);
from++;
to++;
count--;
}
__iormb();
}
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)
{
void *p = (void __force *)to;
__iowmb();
while (count && (!IO_CHECK_ALIGN(p, 8) || !IO_CHECK_ALIGN(from, 8))) {
writeb_relaxed_no_log(*(volatile u8 *)from, p);
from++;
p++;
count--;
}
while (count >= 8) {
writeq_relaxed_no_log(*(volatile u64 *)from, p);
from += 8;
p += 8;
count -= 8;
}
while (count) {
writeb_relaxed_no_log(*(volatile u8 *)from, p);
from++;
p++;
count--;
}
}
EXPORT_SYMBOL(__memcpy_toio);
/*
* "memset" on IO memory space.
*/
void __memset_io(volatile void __iomem *dst, int c, size_t count)
{
void *p = (void __force *)dst;
u64 qc = c;
qc |= qc << 8;
qc |= qc << 16;
qc |= qc << 32;
__iowmb();
while (count && !IO_CHECK_ALIGN(p, 8)) {
writeb_relaxed_no_log(c, p);
p++;
count--;
}
while (count >= 8) {
writeq_relaxed_no_log(qc, p);
p += 8;
count -= 8;
}
while (count) {
writeb_relaxed_no_log(c, p);
p++;
count--;
}
}
EXPORT_SYMBOL(__memset_io);
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