1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/module.h>
 3#include <linux/types.h>
 4
 5#include <asm/io.h>
 6
 7/*
 8 * Copy data from IO memory space to "real" memory space.
 9 * This needs to be optimized.
10 */
11void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
12{
13	char *dst = to;
14
15	while (count) {
16		count--;
17		*dst++ = readb(from++);
18	}
19}
20EXPORT_SYMBOL(memcpy_fromio);
21
22/*
23 * Copy data from "real" memory space to IO memory space.
24 * This needs to be optimized.
25 */
26void memcpy_toio(volatile void __iomem *to, const void *from, long count)
27{
28	const char *src = from;
29
30	while (count) {
31		count--;
32		writeb(*src++, to++);
33	}
34}
35EXPORT_SYMBOL(memcpy_toio);
36
37/*
38 * "memset" on IO memory space.
39 * This needs to be optimized.
40 */
41void memset_io(volatile void __iomem *dst, int c, long count)
42{
43	unsigned char ch = (char)(c & 0xff);
44
45	while (count) {
46		count--;
47		writeb(ch, dst);
48		dst++;
49	}
50}
51EXPORT_SYMBOL(memset_io);