1/*
2 * Copyright 2004-2009 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later.
5 */
6
7#ifndef __BFIN_SPINLOCK_H
8#define __BFIN_SPINLOCK_H
9
10#ifndef CONFIG_SMP
11# include <asm-generic/spinlock.h>
12#else
13
14#include <linux/atomic.h>
15
16asmlinkage int __raw_spin_is_locked_asm(volatile int *ptr);
17asmlinkage void __raw_spin_lock_asm(volatile int *ptr);
18asmlinkage int __raw_spin_trylock_asm(volatile int *ptr);
19asmlinkage void __raw_spin_unlock_asm(volatile int *ptr);
20asmlinkage void __raw_read_lock_asm(volatile int *ptr);
21asmlinkage int __raw_read_trylock_asm(volatile int *ptr);
22asmlinkage void __raw_read_unlock_asm(volatile int *ptr);
23asmlinkage void __raw_write_lock_asm(volatile int *ptr);
24asmlinkage int __raw_write_trylock_asm(volatile int *ptr);
25asmlinkage void __raw_write_unlock_asm(volatile int *ptr);
26
27static inline int arch_spin_is_locked(arch_spinlock_t *lock)
28{
29	return __raw_spin_is_locked_asm(&lock->lock);
30}
31
32static inline void arch_spin_lock(arch_spinlock_t *lock)
33{
34	__raw_spin_lock_asm(&lock->lock);
35}
36
37#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
38
39static inline int arch_spin_trylock(arch_spinlock_t *lock)
40{
41	return __raw_spin_trylock_asm(&lock->lock);
42}
43
44static inline void arch_spin_unlock(arch_spinlock_t *lock)
45{
46	__raw_spin_unlock_asm(&lock->lock);
47}
48
49static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
50{
51	while (arch_spin_is_locked(lock))
52		cpu_relax();
53}
54
55static inline int arch_read_can_lock(arch_rwlock_t *rw)
56{
57	return __raw_uncached_fetch_asm(&rw->lock) > 0;
58}
59
60static inline int arch_write_can_lock(arch_rwlock_t *rw)
61{
62	return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
63}
64
65static inline void arch_read_lock(arch_rwlock_t *rw)
66{
67	__raw_read_lock_asm(&rw->lock);
68}
69
70#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
71
72static inline int arch_read_trylock(arch_rwlock_t *rw)
73{
74	return __raw_read_trylock_asm(&rw->lock);
75}
76
77static inline void arch_read_unlock(arch_rwlock_t *rw)
78{
79	__raw_read_unlock_asm(&rw->lock);
80}
81
82static inline void arch_write_lock(arch_rwlock_t *rw)
83{
84	__raw_write_lock_asm(&rw->lock);
85}
86
87#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
88
89static inline int arch_write_trylock(arch_rwlock_t *rw)
90{
91	return __raw_write_trylock_asm(&rw->lock);
92}
93
94static inline void arch_write_unlock(arch_rwlock_t *rw)
95{
96	__raw_write_unlock_asm(&rw->lock);
97}
98
99#define arch_spin_relax(lock)  	cpu_relax()
100#define arch_read_relax(lock)	cpu_relax()
101#define arch_write_relax(lock)	cpu_relax()
102
103#endif
104
105#endif /*  !__BFIN_SPINLOCK_H */
106