1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __ARCH_H8300_ATOMIC__
3*4882a593Smuzhiyun #define __ARCH_H8300_ATOMIC__
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/compiler.h>
6*4882a593Smuzhiyun #include <linux/types.h>
7*4882a593Smuzhiyun #include <asm/cmpxchg.h>
8*4882a593Smuzhiyun #include <asm/irqflags.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /*
11*4882a593Smuzhiyun * Atomic operations that C can't guarantee us. Useful for
12*4882a593Smuzhiyun * resource counting etc..
13*4882a593Smuzhiyun */
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define atomic_read(v) READ_ONCE((v)->counter)
16*4882a593Smuzhiyun #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define ATOMIC_OP_RETURN(op, c_op) \
19*4882a593Smuzhiyun static inline int atomic_##op##_return(int i, atomic_t *v) \
20*4882a593Smuzhiyun { \
21*4882a593Smuzhiyun h8300flags flags; \
22*4882a593Smuzhiyun int ret; \
23*4882a593Smuzhiyun \
24*4882a593Smuzhiyun flags = arch_local_irq_save(); \
25*4882a593Smuzhiyun ret = v->counter c_op i; \
26*4882a593Smuzhiyun arch_local_irq_restore(flags); \
27*4882a593Smuzhiyun return ret; \
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun #define ATOMIC_FETCH_OP(op, c_op) \
31*4882a593Smuzhiyun static inline int atomic_fetch_##op(int i, atomic_t *v) \
32*4882a593Smuzhiyun { \
33*4882a593Smuzhiyun h8300flags flags; \
34*4882a593Smuzhiyun int ret; \
35*4882a593Smuzhiyun \
36*4882a593Smuzhiyun flags = arch_local_irq_save(); \
37*4882a593Smuzhiyun ret = v->counter; \
38*4882a593Smuzhiyun v->counter c_op i; \
39*4882a593Smuzhiyun arch_local_irq_restore(flags); \
40*4882a593Smuzhiyun return ret; \
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun #define ATOMIC_OP(op, c_op) \
44*4882a593Smuzhiyun static inline void atomic_##op(int i, atomic_t *v) \
45*4882a593Smuzhiyun { \
46*4882a593Smuzhiyun h8300flags flags; \
47*4882a593Smuzhiyun \
48*4882a593Smuzhiyun flags = arch_local_irq_save(); \
49*4882a593Smuzhiyun v->counter c_op i; \
50*4882a593Smuzhiyun arch_local_irq_restore(flags); \
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun ATOMIC_OP_RETURN(add, +=)
54*4882a593Smuzhiyun ATOMIC_OP_RETURN(sub, -=)
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun #define ATOMIC_OPS(op, c_op) \
57*4882a593Smuzhiyun ATOMIC_OP(op, c_op) \
58*4882a593Smuzhiyun ATOMIC_FETCH_OP(op, c_op)
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun ATOMIC_OPS(and, &=)
61*4882a593Smuzhiyun ATOMIC_OPS(or, |=)
62*4882a593Smuzhiyun ATOMIC_OPS(xor, ^=)
63*4882a593Smuzhiyun ATOMIC_OPS(add, +=)
64*4882a593Smuzhiyun ATOMIC_OPS(sub, -=)
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun #undef ATOMIC_OPS
67*4882a593Smuzhiyun #undef ATOMIC_OP_RETURN
68*4882a593Smuzhiyun #undef ATOMIC_OP
69*4882a593Smuzhiyun
atomic_cmpxchg(atomic_t * v,int old,int new)70*4882a593Smuzhiyun static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun int ret;
73*4882a593Smuzhiyun h8300flags flags;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun flags = arch_local_irq_save();
76*4882a593Smuzhiyun ret = v->counter;
77*4882a593Smuzhiyun if (likely(ret == old))
78*4882a593Smuzhiyun v->counter = new;
79*4882a593Smuzhiyun arch_local_irq_restore(flags);
80*4882a593Smuzhiyun return ret;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
atomic_fetch_add_unless(atomic_t * v,int a,int u)83*4882a593Smuzhiyun static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
84*4882a593Smuzhiyun {
85*4882a593Smuzhiyun int ret;
86*4882a593Smuzhiyun h8300flags flags;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun flags = arch_local_irq_save();
89*4882a593Smuzhiyun ret = v->counter;
90*4882a593Smuzhiyun if (ret != u)
91*4882a593Smuzhiyun v->counter += a;
92*4882a593Smuzhiyun arch_local_irq_restore(flags);
93*4882a593Smuzhiyun return ret;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun #define atomic_fetch_add_unless atomic_fetch_add_unless
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun #endif /* __ARCH_H8300_ATOMIC __ */
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