1 /*
2 * Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
3 *
4 * This file is licensed under the terms of the GNU General Public License
5 * version 2. This program is licensed "as is" without any warranty of any
6 * kind, whether express or implied.
7 */
8
9 #ifndef __ASM_OPENRISC_BITOPS_ATOMIC_H
10 #define __ASM_OPENRISC_BITOPS_ATOMIC_H
11
12 static inline void set_bit(int nr, volatile unsigned long *addr)
13 {
14 unsigned long mask = BIT_MASK(nr);
15 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
16 unsigned long tmp;
17
18 __asm__ __volatile__(
19 "1: l.lwa %0,0(%1) \n"
20 " l.or %0,%0,%2 \n"
21 " l.swa 0(%1),%0 \n"
22 " l.bnf 1b \n"
23 " l.nop \n"
24 : "=&r"(tmp)
25 : "r"(p), "r"(mask)
26 : "cc", "memory");
27 }
28
29 static inline void clear_bit(int nr, volatile unsigned long *addr)
30 {
31 unsigned long mask = BIT_MASK(nr);
32 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
33 unsigned long tmp;
34
35 __asm__ __volatile__(
36 "1: l.lwa %0,0(%1) \n"
37 " l.and %0,%0,%2 \n"
38 " l.swa 0(%1),%0 \n"
39 " l.bnf 1b \n"
40 " l.nop \n"
41 : "=&r"(tmp)
42 : "r"(p), "r"(~mask)
43 : "cc", "memory");
44 }
45
46 static inline void change_bit(int nr, volatile unsigned long *addr)
47 {
48 unsigned long mask = BIT_MASK(nr);
49 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
50 unsigned long tmp;
51
52 __asm__ __volatile__(
53 "1: l.lwa %0,0(%1) \n"
54 " l.xor %0,%0,%2 \n"
55 " l.swa 0(%1),%0 \n"
56 " l.bnf 1b \n"
57 " l.nop \n"
58 : "=&r"(tmp)
59 : "r"(p), "r"(mask)
60 : "cc", "memory");
61 }
62
63 static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
64 {
65 unsigned long mask = BIT_MASK(nr);
66 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
67 unsigned long old;
68 unsigned long tmp;
69
70 __asm__ __volatile__(
71 "1: l.lwa %0,0(%2) \n"
72 " l.or %1,%0,%3 \n"
73 " l.swa 0(%2),%1 \n"
74 " l.bnf 1b \n"
75 " l.nop \n"
76 : "=&r"(old), "=&r"(tmp)
77 : "r"(p), "r"(mask)
78 : "cc", "memory");
79
80 return (old & mask) != 0;
81 }
82
83 static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
84 {
85 unsigned long mask = BIT_MASK(nr);
86 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
87 unsigned long old;
88 unsigned long tmp;
89
90 __asm__ __volatile__(
91 "1: l.lwa %0,0(%2) \n"
92 " l.and %1,%0,%3 \n"
93 " l.swa 0(%2),%1 \n"
94 " l.bnf 1b \n"
95 " l.nop \n"
96 : "=&r"(old), "=&r"(tmp)
97 : "r"(p), "r"(~mask)
98 : "cc", "memory");
99
100 return (old & mask) != 0;
101 }
102
103 static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
104 {
105 unsigned long mask = BIT_MASK(nr);
106 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
107 unsigned long old;
108 unsigned long tmp;
109
110 __asm__ __volatile__(
111 "1: l.lwa %0,0(%2) \n"
112 " l.xor %1,%0,%3 \n"
113 " l.swa 0(%2),%1 \n"
114 " l.bnf 1b \n"
115 " l.nop \n"
116 : "=&r"(old), "=&r"(tmp)
117 : "r"(p), "r"(mask)
118 : "cc", "memory");
119
120 return (old & mask) != 0;
121 }
122
123 #endif /* __ASM_OPENRISC_BITOPS_ATOMIC_H */
124
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