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 <asm/atomic.h>
  15
  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 arch_read_lock_asm(volatile int *ptr);
  21 asmlinkage int arch_read_trylock_asm(volatile int *ptr);
  22 asmlinkage void arch_read_unlock_asm(volatile int *ptr);
  23 asmlinkage void arch_write_lock_asm(volatile int *ptr);
  24 asmlinkage int arch_write_trylock_asm(volatile int *ptr);
  25 asmlinkage void arch_write_unlock_asm(volatile int *ptr);
  26
  27 static inline int arch_spin_is_locked(arch_spinlock_t *lock)
  28 {
  29         return __raw_spin_is_locked_asm(&lock->lock);
  30 }
  31
  32 static 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
  39 static inline int arch_spin_trylock(arch_spinlock_t *lock)
  40 {
  41         return __raw_spin_trylock_asm(&lock->lock);
  42 }
  43
  44 static inline void arch_spin_unlock(arch_spinlock_t *lock)
  45 {
  46         __raw_spin_unlock_asm(&lock->lock);
  47 }
  48
  49 static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
  50 {
  51         while (arch_spin_is_locked(lock))
  52                 cpu_relax();
  53 }
  54
  55 static inline int arch_read_can_lock(arch_rwlock_t *rw)
  56 {
  57         return __raw_uncached_fetch_asm(&rw->lock) > 0;
  58 }
  59
  60 static inline int arch_write_can_lock(arch_rwlock_t *rw)
  61 {
  62         return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
  63 }
  64
  65 static inline void arch_read_lock(arch_rwlock_t *rw)
  66 {
  67         arch_read_lock_asm(&rw->lock);
  68 }
  69
  70 static inline int arch_read_trylock(arch_rwlock_t *rw)
  71 {
  72         return arch_read_trylock_asm(&rw->lock);
  73 }
  74
  75 static inline void arch_read_unlock(arch_rwlock_t *rw)
  76 {
  77         arch_read_unlock_asm(&rw->lock);
  78 }
  79
  80 static inline void arch_write_lock(arch_rwlock_t *rw)
  81 {
  82         arch_write_lock_asm(&rw->lock);
  83 }
  84
  85 static inline int arch_write_trylock(arch_rwlock_t *rw)
  86 {
  87         return arch_write_trylock_asm(&rw->lock);
  88 }
  89
  90 static 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 */