1 #ifndef __ARCH_H8300_ATOMIC__
2 #define __ARCH_H8300_ATOMIC__
3
4 #include <linux/types.h>
5 #include <asm/cmpxchg.h>
6
7 /*
8 * Atomic operations that C can't guarantee us. Useful for
9 * resource counting etc..
10 */
11
12 #define ATOMIC_INIT(i) { (i) }
13
14 #define atomic_read(v) READ_ONCE((v)->counter)
15 #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
16
17 #include <linux/kernel.h>
18
19 #define ATOMIC_OP_RETURN(op, c_op) \
20 static inline int atomic_##op##_return(int i, atomic_t *v) \
21 { \
22 h8300flags flags; \
23 int ret; \
24 \
25 flags = arch_local_irq_save(); \
26 ret = v->counter c_op i; \
27 arch_local_irq_restore(flags); \
28 return ret; \
29 }
30
31 #define ATOMIC_OP(op, c_op) \
32 static inline void atomic_##op(int i, atomic_t *v) \
33 { \
34 h8300flags flags; \
35 \
36 flags = arch_local_irq_save(); \
37 v->counter c_op i; \
38 arch_local_irq_restore(flags); \
39 }
40
41 ATOMIC_OP_RETURN(add, +=)
42 ATOMIC_OP_RETURN(sub, -=)
43
44 ATOMIC_OP(and, &=)
45 ATOMIC_OP(or, |=)
46 ATOMIC_OP(xor, ^=)
47
48 #undef ATOMIC_OP_RETURN
49 #undef ATOMIC_OP
50
51 #define atomic_add(i, v) (void)atomic_add_return(i, v)
52 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
53
54 #define atomic_sub(i, v) (void)atomic_sub_return(i, v)
55 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
56
57 #define atomic_inc_return(v) atomic_add_return(1, v)
58 #define atomic_dec_return(v) atomic_sub_return(1, v)
59
60 #define atomic_inc(v) (void)atomic_inc_return(v)
61 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
62
63 #define atomic_dec(v) (void)atomic_dec_return(v)
64 #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
65
atomic_cmpxchg(atomic_t * v,int old,int new)66 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
67 {
68 int ret;
69 h8300flags flags;
70
71 flags = arch_local_irq_save();
72 ret = v->counter;
73 if (likely(ret == old))
74 v->counter = new;
75 arch_local_irq_restore(flags);
76 return ret;
77 }
78
__atomic_add_unless(atomic_t * v,int a,int u)79 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
80 {
81 int ret;
82 h8300flags flags;
83
84 flags = arch_local_irq_save();
85 ret = v->counter;
86 if (ret != u)
87 v->counter += a;
88 arch_local_irq_restore(flags);
89 return ret;
90 }
91
92 #endif /* __ARCH_H8300_ATOMIC __ */
93