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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _IO_H
3#define _IO_H
4
5#include "types.h"
6
7/*
8 * Low-level I/O routines.
9 *
10 * Copied from <file:arch/powerpc/include/asm/io.h> (which has no copyright)
11 */
12static inline int in_8(const volatile unsigned char *addr)
13{
14 int ret;
15
16 __asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
17 : "=r" (ret) : "m" (*addr));
18 return ret;
19}
20
21static inline void out_8(volatile unsigned char *addr, int val)
22{
23 __asm__ __volatile__("stb%U0%X0 %1,%0; sync"
24 : "=m" (*addr) : "r" (val));
25}
26
27static inline unsigned in_le16(const volatile u16 *addr)
28{
29 unsigned ret;
30
31 __asm__ __volatile__("lhbrx %0,0,%1; twi 0,%0,0; isync"
32 : "=r" (ret) : "r" (addr), "m" (*addr));
33
34 return ret;
35}
36
37static inline unsigned in_be16(const volatile u16 *addr)
38{
39 unsigned ret;
40
41 __asm__ __volatile__("lhz%U1%X1 %0,%1; twi 0,%0,0; isync"
42 : "=r" (ret) : "m" (*addr));
43 return ret;
44}
45
46static inline void out_le16(volatile u16 *addr, int val)
47{
48 __asm__ __volatile__("sthbrx %1,0,%2; sync" : "=m" (*addr)
49 : "r" (val), "r" (addr));
50}
51
52static inline void out_be16(volatile u16 *addr, int val)
53{
54 __asm__ __volatile__("sth%U0%X0 %1,%0; sync"
55 : "=m" (*addr) : "r" (val));
56}
57
58static inline unsigned in_le32(const volatile unsigned *addr)
59{
60 unsigned ret;
61
62 __asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync"
63 : "=r" (ret) : "r" (addr), "m" (*addr));
64 return ret;
65}
66
67static inline unsigned in_be32(const volatile unsigned *addr)
68{
69 unsigned ret;
70
71 __asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
72 : "=r" (ret) : "m" (*addr));
73 return ret;
74}
75
76static inline void out_le32(volatile unsigned *addr, int val)
77{
78 __asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr)
79 : "r" (val), "r" (addr));
80}
81
82static inline void out_be32(volatile unsigned *addr, int val)
83{
84 __asm__ __volatile__("stw%U0%X0 %1,%0; sync"
85 : "=m" (*addr) : "r" (val));
86}
87
88static inline void sync(void)
89{
90 asm volatile("sync" : : : "memory");
91}
92
93static inline void eieio(void)
94{
95 asm volatile("eieio" : : : "memory");
96}
97
98static inline void barrier(void)
99{
100 asm volatile("" : : : "memory");
101}
102
103#endif /* _IO_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _IO_H
3#define _IO_H
4
5#include "types.h"
6
7/*
8 * Low-level I/O routines.
9 *
10 * Copied from <file:arch/powerpc/include/asm/io.h> (which has no copyright)
11 */
12static inline int in_8(const volatile unsigned char *addr)
13{
14 int ret;
15
16 __asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
17 : "=r" (ret) : "m" (*addr));
18 return ret;
19}
20
21static inline void out_8(volatile unsigned char *addr, int val)
22{
23 __asm__ __volatile__("stb%U0%X0 %1,%0; sync"
24 : "=m" (*addr) : "r" (val));
25}
26
27static inline unsigned in_le16(const volatile u16 *addr)
28{
29 unsigned ret;
30
31 __asm__ __volatile__("lhbrx %0,0,%1; twi 0,%0,0; isync"
32 : "=r" (ret) : "r" (addr), "m" (*addr));
33
34 return ret;
35}
36
37static inline unsigned in_be16(const volatile u16 *addr)
38{
39 unsigned ret;
40
41 __asm__ __volatile__("lhz%U1%X1 %0,%1; twi 0,%0,0; isync"
42 : "=r" (ret) : "m" (*addr));
43 return ret;
44}
45
46static inline void out_le16(volatile u16 *addr, int val)
47{
48 __asm__ __volatile__("sthbrx %1,0,%2; sync" : "=m" (*addr)
49 : "r" (val), "r" (addr));
50}
51
52static inline void out_be16(volatile u16 *addr, int val)
53{
54 __asm__ __volatile__("sth%U0%X0 %1,%0; sync"
55 : "=m" (*addr) : "r" (val));
56}
57
58static inline unsigned in_le32(const volatile unsigned *addr)
59{
60 unsigned ret;
61
62 __asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync"
63 : "=r" (ret) : "r" (addr), "m" (*addr));
64 return ret;
65}
66
67static inline unsigned in_be32(const volatile unsigned *addr)
68{
69 unsigned ret;
70
71 __asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
72 : "=r" (ret) : "m" (*addr));
73 return ret;
74}
75
76static inline void out_le32(volatile unsigned *addr, int val)
77{
78 __asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr)
79 : "r" (val), "r" (addr));
80}
81
82static inline void out_be32(volatile unsigned *addr, int val)
83{
84 __asm__ __volatile__("stw%U0%X0 %1,%0; sync"
85 : "=m" (*addr) : "r" (val));
86}
87
88static inline void sync(void)
89{
90 asm volatile("sync" : : : "memory");
91}
92
93static inline void eieio(void)
94{
95 asm volatile("eieio" : : : "memory");
96}
97
98static inline void barrier(void)
99{
100 asm volatile("" : : : "memory");
101}
102
103#endif /* _IO_H */