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)				\
20static 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)					\
32static 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
41ATOMIC_OP_RETURN(add, +=)
42ATOMIC_OP_RETURN(sub, -=)
43
44ATOMIC_OP(and, &=)
45ATOMIC_OP(or,  |=)
46ATOMIC_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
66static 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
79static 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