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1/* atomic.h: atomic operation emulation for FR-V
2 *
3 * For an explanation of how atomic ops work in this arch, see:
4 * Documentation/frv/atomic-ops.txt
5 *
6 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
7 * Written by David Howells (dhowells@redhat.com)
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14#ifndef _ASM_ATOMIC_H
15#define _ASM_ATOMIC_H
16
17#include <linux/types.h>
18#include <asm/cmpxchg.h>
19#include <asm/barrier.h>
20
21#ifdef CONFIG_SMP
22#error not SMP safe
23#endif
24
25#include <asm/atomic_defs.h>
26
27/*
28 * Atomic operations that C can't guarantee us. Useful for
29 * resource counting etc..
30 *
31 * We do not have SMP systems, so we don't have to deal with that.
32 */
33
34#define ATOMIC_INIT(i) { (i) }
35#define atomic_read(v) READ_ONCE((v)->counter)
36#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
37
38static inline int atomic_inc_return(atomic_t *v)
39{
40 return __atomic_add_return(1, &v->counter);
41}
42
43static inline int atomic_dec_return(atomic_t *v)
44{
45 return __atomic_sub_return(1, &v->counter);
46}
47
48static inline int atomic_add_return(int i, atomic_t *v)
49{
50 return __atomic_add_return(i, &v->counter);
51}
52
53static inline int atomic_sub_return(int i, atomic_t *v)
54{
55 return __atomic_sub_return(i, &v->counter);
56}
57
58static inline int atomic_add_negative(int i, atomic_t *v)
59{
60 return atomic_add_return(i, v) < 0;
61}
62
63static inline void atomic_add(int i, atomic_t *v)
64{
65 atomic_add_return(i, v);
66}
67
68static inline void atomic_sub(int i, atomic_t *v)
69{
70 atomic_sub_return(i, v);
71}
72
73static inline void atomic_inc(atomic_t *v)
74{
75 atomic_inc_return(v);
76}
77
78static inline void atomic_dec(atomic_t *v)
79{
80 atomic_dec_return(v);
81}
82
83#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
84#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
85#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
86
87/*
88 * 64-bit atomic ops
89 */
90typedef struct {
91 long long counter;
92} atomic64_t;
93
94#define ATOMIC64_INIT(i) { (i) }
95
96static inline long long atomic64_read(const atomic64_t *v)
97{
98 long long counter;
99
100 asm("ldd%I1 %M1,%0"
101 : "=e"(counter)
102 : "m"(v->counter));
103
104 return counter;
105}
106
107static inline void atomic64_set(atomic64_t *v, long long i)
108{
109 asm volatile("std%I0 %1,%M0"
110 : "=m"(v->counter)
111 : "e"(i));
112}
113
114static inline long long atomic64_inc_return(atomic64_t *v)
115{
116 return __atomic64_add_return(1, &v->counter);
117}
118
119static inline long long atomic64_dec_return(atomic64_t *v)
120{
121 return __atomic64_sub_return(1, &v->counter);
122}
123
124static inline long long atomic64_add_return(long long i, atomic64_t *v)
125{
126 return __atomic64_add_return(i, &v->counter);
127}
128
129static inline long long atomic64_sub_return(long long i, atomic64_t *v)
130{
131 return __atomic64_sub_return(i, &v->counter);
132}
133
134static inline long long atomic64_add_negative(long long i, atomic64_t *v)
135{
136 return atomic64_add_return(i, v) < 0;
137}
138
139static inline void atomic64_add(long long i, atomic64_t *v)
140{
141 atomic64_add_return(i, v);
142}
143
144static inline void atomic64_sub(long long i, atomic64_t *v)
145{
146 atomic64_sub_return(i, v);
147}
148
149static inline void atomic64_inc(atomic64_t *v)
150{
151 atomic64_inc_return(v);
152}
153
154static inline void atomic64_dec(atomic64_t *v)
155{
156 atomic64_dec_return(v);
157}
158
159#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
160#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
161#define atomic64_inc_and_test(v) (atomic64_inc_return((v)) == 0)
162
163
164#define atomic_cmpxchg(v, old, new) (cmpxchg(&(v)->counter, old, new))
165#define atomic_xchg(v, new) (xchg(&(v)->counter, new))
166#define atomic64_cmpxchg(v, old, new) (__cmpxchg_64(old, new, &(v)->counter))
167#define atomic64_xchg(v, new) (__xchg_64(new, &(v)->counter))
168
169static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
170{
171 int c, old;
172 c = atomic_read(v);
173 for (;;) {
174 if (unlikely(c == (u)))
175 break;
176 old = atomic_cmpxchg((v), c, c + (a));
177 if (likely(old == c))
178 break;
179 c = old;
180 }
181 return c;
182}
183
184#define ATOMIC_OP(op) \
185static inline void atomic_##op(int i, atomic_t *v) \
186{ \
187 (void)__atomic32_fetch_##op(i, &v->counter); \
188} \
189 \
190static inline void atomic64_##op(long long i, atomic64_t *v) \
191{ \
192 (void)__atomic64_fetch_##op(i, &v->counter); \
193}
194
195ATOMIC_OP(or)
196ATOMIC_OP(and)
197ATOMIC_OP(xor)
198
199#undef ATOMIC_OP
200
201#endif /* _ASM_ATOMIC_H */
1/* atomic.h: atomic operation emulation for FR-V
2 *
3 * For an explanation of how atomic ops work in this arch, see:
4 * Documentation/frv/atomic-ops.txt
5 *
6 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
7 * Written by David Howells (dhowells@redhat.com)
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14#ifndef _ASM_ATOMIC_H
15#define _ASM_ATOMIC_H
16
17#include <linux/types.h>
18#include <asm/spr-regs.h>
19#include <asm/cmpxchg.h>
20
21#ifdef CONFIG_SMP
22#error not SMP safe
23#endif
24
25/*
26 * Atomic operations that C can't guarantee us. Useful for
27 * resource counting etc..
28 *
29 * We do not have SMP systems, so we don't have to deal with that.
30 */
31
32/* Atomic operations are already serializing */
33#define smp_mb__before_atomic_dec() barrier()
34#define smp_mb__after_atomic_dec() barrier()
35#define smp_mb__before_atomic_inc() barrier()
36#define smp_mb__after_atomic_inc() barrier()
37
38#define ATOMIC_INIT(i) { (i) }
39#define atomic_read(v) (*(volatile int *)&(v)->counter)
40#define atomic_set(v, i) (((v)->counter) = (i))
41
42#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
43static inline int atomic_add_return(int i, atomic_t *v)
44{
45 unsigned long val;
46
47 asm("0: \n"
48 " orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
49 " ckeq icc3,cc7 \n"
50 " ld.p %M0,%1 \n" /* LD.P/ORCR must be atomic */
51 " orcr cc7,cc7,cc3 \n" /* set CC3 to true */
52 " add%I2 %1,%2,%1 \n"
53 " cst.p %1,%M0 ,cc3,#1 \n"
54 " corcc gr29,gr29,gr0 ,cc3,#1 \n" /* clear ICC3.Z if store happens */
55 " beq icc3,#0,0b \n"
56 : "+U"(v->counter), "=&r"(val)
57 : "NPr"(i)
58 : "memory", "cc7", "cc3", "icc3"
59 );
60
61 return val;
62}
63
64static inline int atomic_sub_return(int i, atomic_t *v)
65{
66 unsigned long val;
67
68 asm("0: \n"
69 " orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
70 " ckeq icc3,cc7 \n"
71 " ld.p %M0,%1 \n" /* LD.P/ORCR must be atomic */
72 " orcr cc7,cc7,cc3 \n" /* set CC3 to true */
73 " sub%I2 %1,%2,%1 \n"
74 " cst.p %1,%M0 ,cc3,#1 \n"
75 " corcc gr29,gr29,gr0 ,cc3,#1 \n" /* clear ICC3.Z if store happens */
76 " beq icc3,#0,0b \n"
77 : "+U"(v->counter), "=&r"(val)
78 : "NPr"(i)
79 : "memory", "cc7", "cc3", "icc3"
80 );
81
82 return val;
83}
84
85#else
86
87extern int atomic_add_return(int i, atomic_t *v);
88extern int atomic_sub_return(int i, atomic_t *v);
89
90#endif
91
92static inline int atomic_add_negative(int i, atomic_t *v)
93{
94 return atomic_add_return(i, v) < 0;
95}
96
97static inline void atomic_add(int i, atomic_t *v)
98{
99 atomic_add_return(i, v);
100}
101
102static inline void atomic_sub(int i, atomic_t *v)
103{
104 atomic_sub_return(i, v);
105}
106
107static inline void atomic_inc(atomic_t *v)
108{
109 atomic_add_return(1, v);
110}
111
112static inline void atomic_dec(atomic_t *v)
113{
114 atomic_sub_return(1, v);
115}
116
117#define atomic_dec_return(v) atomic_sub_return(1, (v))
118#define atomic_inc_return(v) atomic_add_return(1, (v))
119
120#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
121#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
122#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
123
124/*
125 * 64-bit atomic ops
126 */
127typedef struct {
128 volatile long long counter;
129} atomic64_t;
130
131#define ATOMIC64_INIT(i) { (i) }
132
133static inline long long atomic64_read(atomic64_t *v)
134{
135 long long counter;
136
137 asm("ldd%I1 %M1,%0"
138 : "=e"(counter)
139 : "m"(v->counter));
140 return counter;
141}
142
143static inline void atomic64_set(atomic64_t *v, long long i)
144{
145 asm volatile("std%I0 %1,%M0"
146 : "=m"(v->counter)
147 : "e"(i));
148}
149
150extern long long atomic64_inc_return(atomic64_t *v);
151extern long long atomic64_dec_return(atomic64_t *v);
152extern long long atomic64_add_return(long long i, atomic64_t *v);
153extern long long atomic64_sub_return(long long i, atomic64_t *v);
154
155static inline long long atomic64_add_negative(long long i, atomic64_t *v)
156{
157 return atomic64_add_return(i, v) < 0;
158}
159
160static inline void atomic64_add(long long i, atomic64_t *v)
161{
162 atomic64_add_return(i, v);
163}
164
165static inline void atomic64_sub(long long i, atomic64_t *v)
166{
167 atomic64_sub_return(i, v);
168}
169
170static inline void atomic64_inc(atomic64_t *v)
171{
172 atomic64_inc_return(v);
173}
174
175static inline void atomic64_dec(atomic64_t *v)
176{
177 atomic64_dec_return(v);
178}
179
180#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
181#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
182#define atomic64_inc_and_test(v) (atomic64_inc_return((v)) == 0)
183
184#define atomic_cmpxchg(v, old, new) (cmpxchg(&(v)->counter, old, new))
185#define atomic_xchg(v, new) (xchg(&(v)->counter, new))
186#define atomic64_cmpxchg(v, old, new) (__cmpxchg_64(old, new, &(v)->counter))
187#define atomic64_xchg(v, new) (__xchg_64(new, &(v)->counter))
188
189static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
190{
191 int c, old;
192 c = atomic_read(v);
193 for (;;) {
194 if (unlikely(c == (u)))
195 break;
196 old = atomic_cmpxchg((v), c, c + (a));
197 if (likely(old == c))
198 break;
199 c = old;
200 }
201 return c;
202}
203
204
205#endif /* _ASM_ATOMIC_H */