xtensa: move headers files to arch/xtensa/include

[safe/jmp/linux-2.6] / include / asm-xtensa / rwsem.h

diff --git a/include/asm-xtensa/rwsem.h b/include/asm-xtensa/rwsem.h
deleted file mode 100644 (file)
index e39edf5..0000000
--- a/include/asm-xtensa/rwsem.h
+++ /dev/null
@@ -1,168 +0,0 @@
-/*
- * include/asm-xtensa/rwsem.h
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Largely copied from include/asm-ppc/rwsem.h
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-
-#ifndef _XTENSA_RWSEM_H
-#define _XTENSA_RWSEM_H
-
-#ifndef _LINUX_RWSEM_H
-#error "Please don't include <asm/rwsem.h> directly, use <linux/rwsem.h> instead."
-#endif
-
-#include <linux/list.h>
-#include <linux/spinlock.h>
-#include <asm/atomic.h>
-#include <asm/system.h>
-
-/*
- * the semaphore definition
- */
-struct rw_semaphore {
-       signed long             count;
-#define RWSEM_UNLOCKED_VALUE           0x00000000
-#define RWSEM_ACTIVE_BIAS              0x00000001
-#define RWSEM_ACTIVE_MASK              0x0000ffff
-#define RWSEM_WAITING_BIAS             (-0x00010000)
-#define RWSEM_ACTIVE_READ_BIAS         RWSEM_ACTIVE_BIAS
-#define RWSEM_ACTIVE_WRITE_BIAS                (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
-       spinlock_t              wait_lock;
-       struct list_head        wait_list;
-};
-
-#define __RWSEM_INITIALIZER(name) \
-       { RWSEM_UNLOCKED_VALUE, SPIN_LOCK_UNLOCKED, \
-         LIST_HEAD_INIT((name).wait_list) }
-
-#define DECLARE_RWSEM(name)            \
-       struct rw_semaphore name = __RWSEM_INITIALIZER(name)
-
-extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *sem);
-extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *sem);
-extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem);
-extern struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem);
-
-static inline void init_rwsem(struct rw_semaphore *sem)
-{
-       sem->count = RWSEM_UNLOCKED_VALUE;
-       spin_lock_init(&sem->wait_lock);
-       INIT_LIST_HEAD(&sem->wait_list);
-}
-
-/*
- * lock for reading
- */
-static inline void __down_read(struct rw_semaphore *sem)
-{
-       if (atomic_add_return(1,(atomic_t *)(&sem->count)) > 0)
-               smp_wmb();
-       else
-               rwsem_down_read_failed(sem);
-}
-
-static inline int __down_read_trylock(struct rw_semaphore *sem)
-{
-       int tmp;
-
-       while ((tmp = sem->count) >= 0) {
-               if (tmp == cmpxchg(&sem->count, tmp,
-                                  tmp + RWSEM_ACTIVE_READ_BIAS)) {
-                       smp_wmb();
-                       return 1;
-               }
-       }
-       return 0;
-}
-
-/*
- * lock for writing
- */
-static inline void __down_write(struct rw_semaphore *sem)
-{
-       int tmp;
-
-       tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS,
-                               (atomic_t *)(&sem->count));
-       if (tmp == RWSEM_ACTIVE_WRITE_BIAS)
-               smp_wmb();
-       else
-               rwsem_down_write_failed(sem);
-}
-
-static inline int __down_write_trylock(struct rw_semaphore *sem)
-{
-       int tmp;
-
-       tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
-                     RWSEM_ACTIVE_WRITE_BIAS);
-       smp_wmb();
-       return tmp == RWSEM_UNLOCKED_VALUE;
-}
-
-/*
- * unlock after reading
- */
-static inline void __up_read(struct rw_semaphore *sem)
-{
-       int tmp;
-
-       smp_wmb();
-       tmp = atomic_sub_return(1,(atomic_t *)(&sem->count));
-       if (tmp < -1 && (tmp & RWSEM_ACTIVE_MASK) == 0)
-               rwsem_wake(sem);
-}
-
-/*
- * unlock after writing
- */
-static inline void __up_write(struct rw_semaphore *sem)
-{
-       smp_wmb();
-       if (atomic_sub_return(RWSEM_ACTIVE_WRITE_BIAS,
-                             (atomic_t *)(&sem->count)) < 0)
-               rwsem_wake(sem);
-}
-
-/*
- * implement atomic add functionality
- */
-static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem)
-{
-       atomic_add(delta, (atomic_t *)(&sem->count));
-}
-
-/*
- * downgrade write lock to read lock
- */
-static inline void __downgrade_write(struct rw_semaphore *sem)
-{
-       int tmp;
-
-       smp_wmb();
-       tmp = atomic_add_return(-RWSEM_WAITING_BIAS, (atomic_t *)(&sem->count));
-       if (tmp < 0)
-               rwsem_downgrade_wake(sem);
-}
-
-/*
- * implement exchange and add functionality
- */
-static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
-{
-       smp_mb();
-       return atomic_add_return(delta, (atomic_t *)(&sem->count));
-}
-
-static inline int rwsem_is_locked(struct rw_semaphore *sem)
-{
-       return (sem->count != 0);
-}
-
-#endif /* _XTENSA_RWSEM_H */