1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ARCH_H8300_ATOMIC__
3#define __ARCH_H8300_ATOMIC__
4
5#include <linux/compiler.h>
6#include <linux/types.h>
7#include <asm/cmpxchg.h>
8#include <asm/irqflags.h>
9
10/*
11 * Atomic operations that C can't guarantee us.  Useful for
12 * resource counting etc..
13 */
14
15#define atomic_read(v)		READ_ONCE((v)->counter)
16#define atomic_set(v, i)	WRITE_ONCE(((v)->counter), (i))
17
18#define ATOMIC_OP_RETURN(op, c_op)				\
19static inline int atomic_##op##_return(int i, atomic_t *v)	\
20{								\
21	h8300flags flags;					\
22	int ret;						\
23								\
24	flags = arch_local_irq_save();				\
25	ret = v->counter c_op i;				\
26	arch_local_irq_restore(flags);				\
27	return ret;						\
28}
29
30#define ATOMIC_FETCH_OP(op, c_op)				\
31static inline int atomic_fetch_##op(int i, atomic_t *v)		\
32{								\
33	h8300flags flags;					\
34	int ret;						\
35								\
36	flags = arch_local_irq_save();				\
37	ret = v->counter;					\
38	v->counter c_op i;					\
39	arch_local_irq_restore(flags);				\
40	return ret;						\
41}
42
43#define ATOMIC_OP(op, c_op)					\
44static inline void atomic_##op(int i, atomic_t *v)		\
45{								\
46	h8300flags flags;					\
47								\
48	flags = arch_local_irq_save();				\
49	v->counter c_op i;					\
50	arch_local_irq_restore(flags);				\
51}
52
53ATOMIC_OP_RETURN(add, +=)
54ATOMIC_OP_RETURN(sub, -=)
55
56#define ATOMIC_OPS(op, c_op)					\
57	ATOMIC_OP(op, c_op)					\
58	ATOMIC_FETCH_OP(op, c_op)
59
60ATOMIC_OPS(and, &=)
61ATOMIC_OPS(or,  |=)
62ATOMIC_OPS(xor, ^=)
63ATOMIC_OPS(add, +=)
64ATOMIC_OPS(sub, -=)
65
66#undef ATOMIC_OPS
67#undef ATOMIC_OP_RETURN
68#undef ATOMIC_OP
69
70static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
71{
72	int ret;
73	h8300flags flags;
74
75	flags = arch_local_irq_save();
76	ret = v->counter;
77	if (likely(ret == old))
78		v->counter = new;
79	arch_local_irq_restore(flags);
80	return ret;
81}
82
83static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
84{
85	int ret;
86	h8300flags flags;
87
88	flags = arch_local_irq_save();
89	ret = v->counter;
90	if (ret != u)
91		v->counter += a;
92	arch_local_irq_restore(flags);
93	return ret;
94}
95#define atomic_fetch_add_unless		atomic_fetch_add_unless
96
97#endif /* __ARCH_H8300_ATOMIC __ */
98