Initial import

1 files changed, 105 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/spinlock.h b/arch/blackfin/include/asm/spinlock.h
new file mode 100644
index 000000000..490c7caa0
--- /dev/null
+++ b/arch/blackfin/include/asm/spinlock.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2004-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __BFIN_SPINLOCK_H
+#define __BFIN_SPINLOCK_H
+
+#ifndef CONFIG_SMP
+# include <asm-generic/spinlock.h>
+#else
+
+#include <linux/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 arch_spin_is_locked(arch_spinlock_t *lock)
+{
+	return __raw_spin_is_locked_asm(&lock->lock);
+}
+
+static inline void arch_spin_lock(arch_spinlock_t *lock)
+{
+	__raw_spin_lock_asm(&lock->lock);
+}
+
+#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
+
+static inline int arch_spin_trylock(arch_spinlock_t *lock)
+{
+	return __raw_spin_trylock_asm(&lock->lock);
+}
+
+static inline void arch_spin_unlock(arch_spinlock_t *lock)
+{
+	__raw_spin_unlock_asm(&lock->lock);
+}
+
+static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
+{
+	while (arch_spin_is_locked(lock))
+		cpu_relax();
+}
+
+static inline int arch_read_can_lock(arch_rwlock_t *rw)
+{
+	return __raw_uncached_fetch_asm(&rw->lock) > 0;
+}
+
+static inline int arch_write_can_lock(arch_rwlock_t *rw)
+{
+	return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
+}
+
+static inline void arch_read_lock(arch_rwlock_t *rw)
+{
+	__raw_read_lock_asm(&rw->lock);
+}
+
+#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
+
+static inline int arch_read_trylock(arch_rwlock_t *rw)
+{
+	return __raw_read_trylock_asm(&rw->lock);
+}
+
+static inline void arch_read_unlock(arch_rwlock_t *rw)
+{
+	__raw_read_unlock_asm(&rw->lock);
+}
+
+static inline void arch_write_lock(arch_rwlock_t *rw)
+{
+	__raw_write_lock_asm(&rw->lock);
+}
+
+#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
+
+static inline int arch_write_trylock(arch_rwlock_t *rw)
+{
+	return __raw_write_trylock_asm(&rw->lock);
+}
+
+static inline void arch_write_unlock(arch_rwlock_t *rw)
+{
+	__raw_write_unlock_asm(&rw->lock);
+}
+
+#define arch_spin_relax(lock)  	cpu_relax()
+#define arch_read_relax(lock)	cpu_relax()
+#define arch_write_relax(lock)	cpu_relax()
+
+#endif
+
+#endif /*  !__BFIN_SPINLOCK_H */