1 // SPDX-License-Identifier: GPL-2.0-only
3 * Based on arch/arm/kernel/io.c
5 * Copyright (C) 2012 ARM Ltd.
8 #include <linux/export.h>
9 #include <linux/types.h>
13 * Copy data from IO memory space to "real" memory space.
15 void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
17 while (count && !IS_ALIGNED((unsigned long)from, 8)) {
18 *(u8 *)to = __raw_readb(from);
25 *(u64 *)to = __raw_readq(from);
32 *(u8 *)to = __raw_readb(from);
38 EXPORT_SYMBOL(__memcpy_fromio);
41 * Copy data from "real" memory space to IO memory space.
43 void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
45 while (count && !IS_ALIGNED((unsigned long)to, 8)) {
46 __raw_writeb(*(u8 *)from, to);
53 __raw_writeq(*(u64 *)from, to);
60 __raw_writeb(*(u8 *)from, to);
66 EXPORT_SYMBOL(__memcpy_toio);
69 * "memset" on IO memory space.
71 void __memset_io(volatile void __iomem *dst, int c, size_t count)
79 while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
86 __raw_writeq(qc, dst);
97 EXPORT_SYMBOL(__memset_io);