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 */
memcpy_fromio(void * to,const volatile void __iomem * from,long count)11 void 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 }
20 EXPORT_SYMBOL(memcpy_fromio);
21
22 /*
23 * Copy data from "real" memory space to IO memory space.
24 * This needs to be optimized.
25 */
memcpy_toio(volatile void __iomem * to,const void * from,long count)26 void 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 }
35 EXPORT_SYMBOL(memcpy_toio);
36
37 /*
38 * "memset" on IO memory space.
39 * This needs to be optimized.
40 */
memset_io(volatile void __iomem * dst,int c,long count)41 void 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 }
51 EXPORT_SYMBOL(memset_io);
52