LXR linux/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
  18asmlinkage int __raw_spin_is_locked_asm(volatile int *ptr);
  19asmlinkage void __raw_spin_lock_asm(volatile int *ptr);
  20asmlinkage int __raw_spin_trylock_asm(volatile int *ptr);
  21asmlinkage void __raw_spin_unlock_asm(volatile int *ptr);
  22asmlinkage void __raw_read_lock_asm(volatile int *ptr);
  23asmlinkage int __raw_read_trylock_asm(volatile int *ptr);
  24asmlinkage void __raw_read_unlock_asm(volatile int *ptr);
  25asmlinkage void __raw_write_lock_asm(volatile int *ptr);
  26asmlinkage int __raw_write_trylock_asm(volatile int *ptr);
  27asmlinkage void __raw_write_unlock_asm(volatile int *ptr);
  28
  29static inline int arch_spin_is_locked(arch_spinlock_t *lock)
  30{
  31        return __raw_spin_is_locked_asm(&lock->lock);
  32}
  33
  34static 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
  41static inline int arch_spin_trylock(arch_spinlock_t *lock)
  42{
  43        return __raw_spin_trylock_asm(&lock->lock);
  44}
  45
  46static inline void arch_spin_unlock(arch_spinlock_t *lock)
  47{
  48        __raw_spin_unlock_asm(&lock->lock);
  49}
  50
  51static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
  52{
  53        smp_cond_load_acquire(&lock->lock, !VAL);
  54}
  55
  56static inline int arch_read_can_lock(arch_rwlock_t *rw)
  57{
  58        return __raw_uncached_fetch_asm(&rw->lock) > 0;
  59}
  60
  61static inline int arch_write_can_lock(arch_rwlock_t *rw)
  62{
  63        return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
  64}
  65
  66static 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
  73static inline int arch_read_trylock(arch_rwlock_t *rw)
  74{
  75        return __raw_read_trylock_asm(&rw->lock);
  76}
  77
  78static inline void arch_read_unlock(arch_rwlock_t *rw)
  79{
  80        __raw_read_unlock_asm(&rw->lock);
  81}
  82
  83static 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
  90static inline int arch_write_trylock(arch_rwlock_t *rw)
  91{
  92        return __raw_write_trylock_asm(&rw->lock);
  93}
  94
  95static 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 */
 107