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 <asm/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 arch_read_lock_asm(volatile int *ptr); 21asmlinkage int arch_read_trylock_asm(volatile int *ptr); 22asmlinkage void arch_read_unlock_asm(volatile int *ptr); 23asmlinkage void arch_write_lock_asm(volatile int *ptr); 24asmlinkage int arch_write_trylock_asm(volatile int *ptr); 25asmlinkage void arch_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 arch_read_lock_asm(&rw->lock); 68} 69 70static inline int arch_read_trylock(arch_rwlock_t *rw) 71{ 72 return arch_read_trylock_asm(&rw->lock); 73} 74 75static inline void arch_read_unlock(arch_rwlock_t *rw) 76{ 77 arch_read_unlock_asm(&rw->lock); 78} 79 80static inline void arch_write_lock(arch_rwlock_t *rw) 81{ 82 arch_write_lock_asm(&rw->lock); 83} 84 85static inline int arch_write_trylock(arch_rwlock_t *rw) 86{ 87 return arch_write_trylock_asm(&rw->lock); 88} 89 90static inline void arch_write_unlock(arch_rwlock_t *rw) 91{ 92 arch_write_unlock_asm(&rw->lock); 93} 94 95#define arch_spin_relax(lock) cpu_relax() 96#define arch_read_relax(lock) cpu_relax() 97#define arch_write_relax(lock) cpu_relax() 98 99#endif 100 101#endif /* !__BFIN_SPINLOCK_H */ 102