2 * Based on arch/arm/kernel/io.c
4 * Copyright (C) 2012 ARM Ltd.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #include <linux/export.h>
20 #include <linux/types.h>
24 * Copy data from IO memory space to "real" memory space.
26 void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
28 while (count && (!IS_ALIGNED((unsigned long)from, 8) ||
29 !IS_ALIGNED((unsigned long)to, 8))) {
30 *(u8 *)to = __raw_readb(from);
37 *(u64 *)to = __raw_readq(from);
44 *(u8 *)to = __raw_readb(from);
50 EXPORT_SYMBOL(__memcpy_fromio);
53 * Copy data from "real" memory space to IO memory space.
55 void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
57 while (count && (!IS_ALIGNED((unsigned long)to, 8) ||
58 !IS_ALIGNED((unsigned long)from, 8))) {
59 __raw_writeb(*(volatile u8 *)from, to);
66 __raw_writeq(*(volatile u64 *)from, to);
73 __raw_writeb(*(volatile u8 *)from, to);
79 EXPORT_SYMBOL(__memcpy_toio);
82 * "memset" on IO memory space.
84 void __memset_io(volatile void __iomem *dst, int c, size_t count)
92 while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
99 __raw_writeq(qc, dst);
105 __raw_writeb(c, dst);
110 EXPORT_SYMBOL(__memset_io);