Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code

Blackfin dual core BF561 processor can support SMP like features.
https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like

In this patch, we provide SMP extend to Blackfin header files
and machine common code

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 85 insertions, 2 deletions

diff --git a/arch/blackfin/include/asm/spinlock.h b/arch/blackfin/include/asm/spinlock.h
index 64e908a50646..0249ac319476 100644
--- a/arch/blackfin/include/asm/spinlock.h
+++ b/arch/blackfin/include/asm/spinlock.h
@@ -1,6 +1,89 @@
 #ifndef __BFIN_SPINLOCK_H
 #define __BFIN_SPINLOCK_H
 
-#error blackfin architecture does not support SMP spin lock yet
+#include <asm/atomic.h>
 
-#endif
+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 /*  !__BFIN_SPINLOCK_H */