Blackfin: mass clean up of copyright/licensing info

[safe/jmp/linux-2.6] / arch / blackfin / include / asm / spinlock.h

diff --git a/arch/blackfin/include/asm/spinlock.h b/arch/blackfin/include/asm/spinlock.h
index 64e908a..b0c7f0e 100644 (file)
--- a/arch/blackfin/include/asm/spinlock.h
+++ b/arch/blackfin/include/asm/spinlock.h
@@ -1,6 +1,101 @@
+/*
+ * Copyright 2004-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
 #ifndef __BFIN_SPINLOCK_H
 #define __BFIN_SPINLOCK_H
 
-#error blackfin architecture does not support SMP spin lock yet
+#ifndef CONFIG_SMP
+# include <asm-generic/spinlock.h>
+#else
+
+#include <asm/atomic.h>
+
+asmlinkage int __raw_spin_is_locked_asm(volatile int *ptr);
+asmlinkage void __raw_spin_lock_asm(volatile int *ptr);
+asmlinkage int __raw_spin_trylock_asm(volatile int *ptr);
+asmlinkage void __raw_spin_unlock_asm(volatile int *ptr);
+asmlinkage void __raw_read_lock_asm(volatile int *ptr);
+asmlinkage int __raw_read_trylock_asm(volatile int *ptr);
+asmlinkage void __raw_read_unlock_asm(volatile int *ptr);
+asmlinkage void __raw_write_lock_asm(volatile int *ptr);
+asmlinkage int __raw_write_trylock_asm(volatile int *ptr);
+asmlinkage void __raw_write_unlock_asm(volatile int *ptr);
+
+static inline int __raw_spin_is_locked(raw_spinlock_t *lock)
+{
+       return __raw_spin_is_locked_asm(&lock->lock);
+}
+
+static inline void __raw_spin_lock(raw_spinlock_t *lock)
+{
+       __raw_spin_lock_asm(&lock->lock);
+}
+
+#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
+
+static inline int __raw_spin_trylock(raw_spinlock_t *lock)
+{
+       return __raw_spin_trylock_asm(&lock->lock);
+}
+
+static inline void __raw_spin_unlock(raw_spinlock_t *lock)
+{
+       __raw_spin_unlock_asm(&lock->lock);
+}
+
+static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)
+{
+       while (__raw_spin_is_locked(lock))
+               cpu_relax();
+}
+
+static inline int __raw_read_can_lock(raw_rwlock_t *rw)
+{
+       return __raw_uncached_fetch_asm(&rw->lock) > 0;
+}
+
+static inline int __raw_write_can_lock(raw_rwlock_t *rw)
+{
+       return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
+}
+
+static inline void __raw_read_lock(raw_rwlock_t *rw)
+{
+       __raw_read_lock_asm(&rw->lock);
+}
+
+static inline int __raw_read_trylock(raw_rwlock_t *rw)
+{
+       return __raw_read_trylock_asm(&rw->lock);
+}
+
+static inline void __raw_read_unlock(raw_rwlock_t *rw)
+{
+       __raw_read_unlock_asm(&rw->lock);
+}
+
+static inline void __raw_write_lock(raw_rwlock_t *rw)
+{
+       __raw_write_lock_asm(&rw->lock);
+}
+
+static inline int __raw_write_trylock(raw_rwlock_t *rw)
+{
+       return __raw_write_trylock_asm(&rw->lock);
+}
+
+static inline void __raw_write_unlock(raw_rwlock_t *rw)
+{
+       __raw_write_unlock_asm(&rw->lock);
+}
+
+#define _raw_spin_relax(lock)          cpu_relax()
+#define _raw_read_relax(lock)  cpu_relax()
+#define _raw_write_relax(lock) cpu_relax()
 
 #endif
+
+#endif /*  !__BFIN_SPINLOCK_H */