1/*
2 * Based on arch/arm/kernel/io.c
3 *
4 * Copyright (C) 2012 ARM Ltd.
5 *
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.
9 *
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.
14 *
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/>.
17 */
18
19#include <linux/export.h>
20#include <linux/types.h>
21#include <linux/io.h>
22
23/*
24 * Copy data from IO memory space to "real" memory space.
25 */
26void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
27{
28	while (count && (!IS_ALIGNED((unsigned long)from, 8) ||
29			 !IS_ALIGNED((unsigned long)to, 8))) {
30		*(u8 *)to = __raw_readb(from);
31		from++;
32		to++;
33		count--;
34	}
35
36	while (count >= 8) {
37		*(u64 *)to = __raw_readq(from);
38		from += 8;
39		to += 8;
40		count -= 8;
41	}
42
43	while (count) {
44		*(u8 *)to = __raw_readb(from);
45		from++;
46		to++;
47		count--;
48	}
49}
50EXPORT_SYMBOL(__memcpy_fromio);
51
52/*
53 * Copy data from "real" memory space to IO memory space.
54 */
55void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
56{
57	while (count && (!IS_ALIGNED((unsigned long)to, 8) ||
58			 !IS_ALIGNED((unsigned long)from, 8))) {
59		__raw_writeb(*(volatile u8 *)from, to);
60		from++;
61		to++;
62		count--;
63	}
64
65	while (count >= 8) {
66		__raw_writeq(*(volatile u64 *)from, to);
67		from += 8;
68		to += 8;
69		count -= 8;
70	}
71
72	while (count) {
73		__raw_writeb(*(volatile u8 *)from, to);
74		from++;
75		to++;
76		count--;
77	}
78}
79EXPORT_SYMBOL(__memcpy_toio);
80
81/*
82 * "memset" on IO memory space.
83 */
84void __memset_io(volatile void __iomem *dst, int c, size_t count)
85{
86	u64 qc = (u8)c;
87
88	qc |= qc << 8;
89	qc |= qc << 16;
90	qc |= qc << 32;
91
92	while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
93		__raw_writeb(c, dst);
94		dst++;
95		count--;
96	}
97
98	while (count >= 8) {
99		__raw_writeq(qc, dst);
100		dst += 8;
101		count -= 8;
102	}
103
104	while (count) {
105		__raw_writeb(c, dst);
106		dst++;
107		count--;
108	}
109}
110EXPORT_SYMBOL(__memset_io);
111