arch/blackfin/include/asm/spinlock.h

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