kernel/2.6.29.6-aldebaran-rt/arch/blackfin/include/asm/spinlock.h

   1 #ifndef __BFIN_SPINLOCK_H
   2 #define __BFIN_SPINLOCK_H
   3
   4 #include <asm/atomic.h>
   5
   6 asmlinkage int __raw_spin_is_locked_asm(volatile int *ptr);
   7 asmlinkage void __raw_spin_lock_asm(volatile int *ptr);
   8 asmlinkage int __raw_spin_trylock_asm(volatile int *ptr);
   9 asmlinkage void __raw_spin_unlock_asm(volatile int *ptr);
  10 asmlinkage void __raw_read_lock_asm(volatile int *ptr);
  11 asmlinkage int __raw_read_trylock_asm(volatile int *ptr);
  12 asmlinkage void __raw_read_unlock_asm(volatile int *ptr);
  13 asmlinkage void __raw_write_lock_asm(volatile int *ptr);
  14 asmlinkage int __raw_write_trylock_asm(volatile int *ptr);
  15 asmlinkage void __raw_write_unlock_asm(volatile int *ptr);
  16
  17 static inline int __raw_spin_is_locked(raw_spinlock_t *lock)
  18 {
  19         return __raw_spin_is_locked_asm(&lock->lock);
  20 }
  21
  22 static inline void __raw_spin_lock(raw_spinlock_t *lock)
  23 {
  24         __raw_spin_lock_asm(&lock->lock);
  25 }
  26
  27 #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
  28
  29 static inline int __raw_spin_trylock(raw_spinlock_t *lock)
  30 {
  31         return __raw_spin_trylock_asm(&lock->lock);
  32 }
  33
  34 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
  35 {
  36         __raw_spin_unlock_asm(&lock->lock);
  37 }
  38
  39 static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)
  40 {
  41         while (__raw_spin_is_locked(lock))
  42                 cpu_relax();
  43 }
  44
  45 static inline int __raw_read_can_lock(raw_rwlock_t *rw)
  46 {
  47         return __raw_uncached_fetch_asm(&rw->lock) > 0;
  48 }
  49
  50 static inline int __raw_write_can_lock(raw_rwlock_t *rw)
  51 {
  52         return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
  53 }
  54
  55 static inline void __raw_read_lock(raw_rwlock_t *rw)
  56 {
  57         __raw_read_lock_asm(&rw->lock);
  58 }
  59
  60 static inline int __raw_read_trylock(raw_rwlock_t *rw)
  61 {
  62         return __raw_read_trylock_asm(&rw->lock);
  63 }
  64
  65 static inline void __raw_read_unlock(raw_rwlock_t *rw)
  66 {
  67         __raw_read_unlock_asm(&rw->lock);
  68 }
  69
  70 static inline void __raw_write_lock(raw_rwlock_t *rw)
  71 {
  72         __raw_write_lock_asm(&rw->lock);
  73 }
  74
  75 static inline int __raw_write_trylock(raw_rwlock_t *rw)
  76 {
  77         return __raw_write_trylock_asm(&rw->lock);
  78 }
  79
  80 static inline void __raw_write_unlock(raw_rwlock_t *rw)
  81 {
  82         __raw_write_unlock_asm(&rw->lock);
  83 }
  84
  85 #define _raw_spin_relax(lock)   cpu_relax()
  86 #define _raw_read_relax(lock)   cpu_relax()
  87 #define _raw_write_relax(lock)  cpu_relax()
  88
  89 #endif /*  !__BFIN_SPINLOCK_H */