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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
11 struct 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 __MUTEX_INITIALIZER(name) \
22 __SEMAPHORE_INITIALIZER (name,1)
23
24 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
25 struct semaphore name = __SEMAPHORE_INITIALIZER (name,count)
26
27 #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC (name,1)
28 #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC (name,0)
29
30 extern inline void sema_init (struct semaphore *sem, int val)
31 {
32 *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
33 }
34
35 static inline void init_MUTEX (struct semaphore *sem)
36 {
37 sema_init (sem, 1);
38 }
39
40 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
41 {
42 sema_init (sem, 0);
43 }
44
45 /*
46 * special register calling convention
47 */
48 asmlinkage void __down_failed (void);
49 asmlinkage int __down_interruptible_failed (void);
50 asmlinkage int __down_trylock_failed (void);
51 asmlinkage void __up_wakeup (void);
52
53 extern void __down (struct semaphore * sem);
54 extern int __down_interruptible (struct semaphore * sem);
55 extern int __down_trylock (struct semaphore * sem);
56 extern void __up (struct semaphore * sem);
57
58 extern inline void down (struct semaphore * sem)
59 {
60 might_sleep();
61 if (atomic_dec_return (&sem->count) < 0)
62 __down (sem);
63 }
64
65 extern inline int down_interruptible (struct semaphore * sem)
66 {
67 int ret = 0;
68 might_sleep();
69 if (atomic_dec_return (&sem->count) < 0)
70 ret = __down_interruptible (sem);
71 return ret;
72 }
73
74 extern inline int down_trylock (struct semaphore *sem)
75 {
76 int ret = 0;
77 if (atomic_dec_return (&sem->count) < 0)
78 ret = __down_trylock (sem);
79 return ret;
80 }
81
82 extern inline void up (struct semaphore * sem)
83 {
84 if (atomic_inc_return (&sem->count) <= 0)
85 __up (sem);
86 }
87
88 #endif /* __V850_SEMAPHORE_H__ */