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