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 | */ |
12 | static 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 | |
21 | static 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 | |
27 | static 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 | |
37 | static 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 | |
46 | static 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 | |
52 | static 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 | |
58 | static 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 | |
67 | static 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 | |
76 | static 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 | |
82 | static 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 | |
88 | static inline void sync(void) |
89 | { |
90 | asm volatile("sync" : : : "memory" ); |
91 | } |
92 | |
93 | static inline void eieio(void) |
94 | { |
95 | asm volatile("eieio" : : : "memory" ); |
96 | } |
97 | |
98 | static inline void barrier(void) |
99 | { |
100 | asm volatile("" : : : "memory" ); |
101 | } |
102 | |
103 | #endif /* _IO_H */ |
104 | |