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_ATOMIC_H
10 #define __ASM_OPENRISC_ATOMIC_H
11
12 #include <linux/types.h>
13
14 /* Atomically perform op with v->counter and i */
15 #define ATOMIC_OP(op) \
16 static inline void arch_atomic_##op(int i, atomic_t *v) \
17 { \
18 int tmp; \
19 \
20 __asm__ __volatile__( \
21 "1: l.lwa %0,0(%1) \n" \
22 " l." #op " %0,%0,%2 \n" \
23 " l.swa 0(%1),%0 \n" \
24 " l.bnf 1b \n" \
25 " l.nop \n" \
26 : "=&r"(tmp) \
27 : "r"(&v->counter), "r"(i) \
28 : "cc", "memory"); \
29 }
30
31 /* Atomically perform op with v->counter and i, return the result */
32 #define ATOMIC_OP_RETURN(op) \
33 static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
34 { \
35 int tmp; \
36 \
37 __asm__ __volatile__( \
38 "1: l.lwa %0,0(%1) \n" \
39 " l." #op " %0,%0,%2 \n" \
40 " l.swa 0(%1),%0 \n" \
41 " l.bnf 1b \n" \
42 " l.nop \n" \
43 : "=&r"(tmp) \
44 : "r"(&v->counter), "r"(i) \
45 : "cc", "memory"); \
46 \
47 return tmp; \
48 }
49
50 /* Atomically perform op with v->counter and i, return orig v->counter */
51 #define ATOMIC_FETCH_OP(op) \
52 static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
53 { \
54 int tmp, old; \
55 \
56 __asm__ __volatile__( \
57 "1: l.lwa %0,0(%2) \n" \
58 " l." #op " %1,%0,%3 \n" \
59 " l.swa 0(%2),%1 \n" \
60 " l.bnf 1b \n" \
61 " l.nop \n" \
62 : "=&r"(old), "=&r"(tmp) \
63 : "r"(&v->counter), "r"(i) \
64 : "cc", "memory"); \
65 \
66 return old; \
67 }
68
69 ATOMIC_OP_RETURN(add)
70 ATOMIC_OP_RETURN(sub)
71
72 ATOMIC_FETCH_OP(add)
73 ATOMIC_FETCH_OP(sub)
74 ATOMIC_FETCH_OP(and)
75 ATOMIC_FETCH_OP(or)
76 ATOMIC_FETCH_OP(xor)
77
78 ATOMIC_OP(add)
79 ATOMIC_OP(sub)
80 ATOMIC_OP(and)
81 ATOMIC_OP(or)
82 ATOMIC_OP(xor)
83
84 #undef ATOMIC_FETCH_OP
85 #undef ATOMIC_OP_RETURN
86 #undef ATOMIC_OP
87
88 #define arch_atomic_add_return arch_atomic_add_return
89 #define arch_atomic_sub_return arch_atomic_sub_return
90 #define arch_atomic_fetch_add arch_atomic_fetch_add
91 #define arch_atomic_fetch_sub arch_atomic_fetch_sub
92 #define arch_atomic_fetch_and arch_atomic_fetch_and
93 #define arch_atomic_fetch_or arch_atomic_fetch_or
94 #define arch_atomic_fetch_xor arch_atomic_fetch_xor
95 #define arch_atomic_add arch_atomic_add
96 #define arch_atomic_sub arch_atomic_sub
97 #define arch_atomic_and arch_atomic_and
98 #define arch_atomic_or arch_atomic_or
99 #define arch_atomic_xor arch_atomic_xor
100
101 /*
102 * Atomically add a to v->counter as long as v is not already u.
103 * Returns the original value at v->counter.
104 *
105 * This is often used through atomic_inc_not_zero()
106 */
107 static inline int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u)
108 {
109 int old, tmp;
110
111 __asm__ __volatile__(
112 "1: l.lwa %0, 0(%2) \n"
113 " l.sfeq %0, %4 \n"
114 " l.bf 2f \n"
115 " l.add %1, %0, %3 \n"
116 " l.swa 0(%2), %1 \n"
117 " l.bnf 1b \n"
118 " l.nop \n"
119 "2: \n"
120 : "=&r"(old), "=&r" (tmp)
121 : "r"(&v->counter), "r"(a), "r"(u)
122 : "cc", "memory");
123
124 return old;
125 }
126 #define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless
127
128 #define arch_atomic_read(v) READ_ONCE((v)->counter)
129 #define arch_atomic_set(v,i) WRITE_ONCE((v)->counter, (i))
130
131 #include <asm/cmpxchg.h>
132
133 #endif /* __ASM_OPENRISC_ATOMIC_H */
134
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