Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / arch / blackfin / include / asm / spinlock.h
blob490c7caa02d9337b7b91ae8db6934320e0e91715
1 /*
2 * Copyright 2004-2009 Analog Devices Inc.
4 * Licensed under the GPL-2 or later.
5 */
7 #ifndef __BFIN_SPINLOCK_H
8 #define __BFIN_SPINLOCK_H
10 #ifndef CONFIG_SMP
11 # include <asm-generic/spinlock.h>
12 #else
14 #include <linux/atomic.h>
16 asmlinkage int __raw_spin_is_locked_asm(volatile int *ptr);
17 asmlinkage void __raw_spin_lock_asm(volatile int *ptr);
18 asmlinkage int __raw_spin_trylock_asm(volatile int *ptr);
19 asmlinkage void __raw_spin_unlock_asm(volatile int *ptr);
20 asmlinkage void __raw_read_lock_asm(volatile int *ptr);
21 asmlinkage int __raw_read_trylock_asm(volatile int *ptr);
22 asmlinkage void __raw_read_unlock_asm(volatile int *ptr);
23 asmlinkage void __raw_write_lock_asm(volatile int *ptr);
24 asmlinkage int __raw_write_trylock_asm(volatile int *ptr);
25 asmlinkage void __raw_write_unlock_asm(volatile int *ptr);
27 static inline int arch_spin_is_locked(arch_spinlock_t *lock)
29 return __raw_spin_is_locked_asm(&lock->lock);
32 static inline void arch_spin_lock(arch_spinlock_t *lock)
34 __raw_spin_lock_asm(&lock->lock);
37 #define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
39 static inline int arch_spin_trylock(arch_spinlock_t *lock)
41 return __raw_spin_trylock_asm(&lock->lock);
44 static inline void arch_spin_unlock(arch_spinlock_t *lock)
46 __raw_spin_unlock_asm(&lock->lock);
49 static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
51 while (arch_spin_is_locked(lock))
52 cpu_relax();
55 static inline int arch_read_can_lock(arch_rwlock_t *rw)
57 return __raw_uncached_fetch_asm(&rw->lock) > 0;
60 static inline int arch_write_can_lock(arch_rwlock_t *rw)
62 return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
65 static inline void arch_read_lock(arch_rwlock_t *rw)
67 __raw_read_lock_asm(&rw->lock);
70 #define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
72 static inline int arch_read_trylock(arch_rwlock_t *rw)
74 return __raw_read_trylock_asm(&rw->lock);
77 static inline void arch_read_unlock(arch_rwlock_t *rw)
79 __raw_read_unlock_asm(&rw->lock);
82 static inline void arch_write_lock(arch_rwlock_t *rw)
84 __raw_write_lock_asm(&rw->lock);
87 #define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
89 static inline int arch_write_trylock(arch_rwlock_t *rw)
91 return __raw_write_trylock_asm(&rw->lock);
94 static inline void arch_write_unlock(arch_rwlock_t *rw)
96 __raw_write_unlock_asm(&rw->lock);
99 #define arch_spin_relax(lock) cpu_relax()
100 #define arch_read_relax(lock) cpu_relax()
101 #define arch_write_relax(lock) cpu_relax()
103 #endif
105 #endif /* !__BFIN_SPINLOCK_H */