1#ifndef __V850_SEMAPHORE_H__
2#define __V850_SEMAPHORE_H__
3
4#include <linux/linkage.h>
5#include <linux/spinlock.h>
6#include <linux/wait.h>
7#include <linux/rwsem.h>
8
9#include <asm/atomic.h>
10
11struct semaphore {
12	atomic_t count;
13	int sleepers;
14	wait_queue_head_t wait;
15};
16
17#define __SEMAPHORE_INITIALIZER(name,count)				      \
18	{ ATOMIC_INIT (count), 0,					      \
19	  __WAIT_QUEUE_HEAD_INITIALIZER ((name).wait) }
20
21#define __DECLARE_SEMAPHORE_GENERIC(name,count)	\
22	struct semaphore name = __SEMAPHORE_INITIALIZER (name,count)
23
24#define DECLARE_MUTEX(name)		__DECLARE_SEMAPHORE_GENERIC (name,1)
25#define DECLARE_MUTEX_LOCKED(name)	__DECLARE_SEMAPHORE_GENERIC (name,0)
26
27static inline void sema_init (struct semaphore *sem, int val)
28{
29	*sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
30}
31
32static inline void init_MUTEX (struct semaphore *sem)
33{
34	sema_init (sem, 1);
35}
36
37static inline void init_MUTEX_LOCKED (struct semaphore *sem)
38{
39	sema_init (sem, 0);
40}
41
42/*
43 * special register calling convention
44 */
45asmlinkage void __down_failed (void);
46asmlinkage int  __down_interruptible_failed (void);
47asmlinkage int  __down_trylock_failed (void);
48asmlinkage void __up_wakeup (void);
49
50extern void __down (struct semaphore * sem);
51extern int  __down_interruptible (struct semaphore * sem);
52extern int  __down_trylock (struct semaphore * sem);
53extern void __up (struct semaphore * sem);
54
55static inline void down (struct semaphore * sem)
56{
57	might_sleep();
58	if (atomic_dec_return (&sem->count) < 0)
59		__down (sem);
60}
61
62static inline int down_interruptible (struct semaphore * sem)
63{
64	int ret = 0;
65	might_sleep();
66	if (atomic_dec_return (&sem->count) < 0)
67		ret = __down_interruptible (sem);
68	return ret;
69}
70
71static inline int down_trylock (struct semaphore *sem)
72{
73	int ret = 0;
74	if (atomic_dec_return (&sem->count) < 0)
75		ret = __down_trylock (sem);
76	return ret;
77}
78
79static inline void up (struct semaphore * sem)
80{
81	if (atomic_inc_return (&sem->count) <= 0)
82		__up (sem);
83}
84
85#endif /* __V850_SEMAPHORE_H__ */
86