1#ifndef _H8300_SEMAPHORE_H
2#define _H8300_SEMAPHORE_H
3
4#define RW_LOCK_BIAS		 0x01000000
5
6#ifndef __ASSEMBLY__
7
8#include <linux/linkage.h>
9#include <linux/wait.h>
10#include <linux/spinlock.h>
11#include <linux/rwsem.h>
12
13#include <asm/system.h>
14#include <asm/atomic.h>
15
16/*
17 * Interrupt-safe semaphores..
18 *
19 * (C) Copyright 1996 Linus Torvalds
20 *
21 * H8/300 version by Yoshinori Sato
22 */
23
24
25struct semaphore {
26	atomic_t count;
27	int sleepers;
28	wait_queue_head_t wait;
29};
30
31#define __SEMAPHORE_INITIALIZER(name, n)				\
32{									\
33	.count		= ATOMIC_INIT(n),				\
34	.sleepers	= 0,						\
35	.wait		= __WAIT_QUEUE_HEAD_INITIALIZER((name).wait)	\
36}
37
38#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
39	struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
40
41#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
42#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0)
43
44static inline void sema_init (struct semaphore *sem, int val)
45{
46	*sem = (struct semaphore)__SEMAPHORE_INITIALIZER(*sem, val);
47}
48
49static inline void init_MUTEX (struct semaphore *sem)
50{
51	sema_init(sem, 1);
52}
53
54static inline void init_MUTEX_LOCKED (struct semaphore *sem)
55{
56	sema_init(sem, 0);
57}
58
59asmlinkage void __down_failed(void /* special register calling convention */);
60asmlinkage int  __down_failed_interruptible(void  /* params in registers */);
61asmlinkage int  __down_failed_trylock(void  /* params in registers */);
62asmlinkage void __up_wakeup(void /* special register calling convention */);
63
64asmlinkage void __down(struct semaphore * sem);
65asmlinkage int  __down_interruptible(struct semaphore * sem);
66asmlinkage int  __down_trylock(struct semaphore * sem);
67asmlinkage void __up(struct semaphore * sem);
68
69extern spinlock_t semaphore_wake_lock;
70
71/*
72 * This is ugly, but we want the default case to fall through.
73 * "down_failed" is a special asm handler that calls the C
74 * routine that actually waits. See arch/m68k/lib/semaphore.S
75 */
76static inline void down(struct semaphore * sem)
77{
78	register atomic_t *count asm("er0");
79
80	might_sleep();
81
82	count = &(sem->count);
83	__asm__ __volatile__(
84		"stc ccr,r3l\n\t"
85		"orc #0x80,ccr\n\t"
86		"mov.l %2, er1\n\t"
87		"dec.l #1,er1\n\t"
88		"mov.l er1,%0\n\t"
89		"bpl 1f\n\t"
90		"ldc r3l,ccr\n\t"
91		"mov.l %1,er0\n\t"
92		"jsr @___down\n\t"
93		"bra 2f\n"
94		"1:\n\t"
95		"ldc r3l,ccr\n"
96		"2:"
97		: "=m"(*count)
98		: "g"(sem),"m"(*count)
99		: "cc",  "er1", "er2", "er3");
100}
101
102static inline int down_interruptible(struct semaphore * sem)
103{
104	register atomic_t *count asm("er0");
105
106	might_sleep();
107
108	count = &(sem->count);
109	__asm__ __volatile__(
110		"stc ccr,r1l\n\t"
111		"orc #0x80,ccr\n\t"
112		"mov.l %3, er2\n\t"
113		"dec.l #1,er2\n\t"
114		"mov.l er2,%1\n\t"
115		"bpl 1f\n\t"
116		"ldc r1l,ccr\n\t"
117		"mov.l %2,er0\n\t"
118		"jsr @___down_interruptible\n\t"
119		"bra 2f\n"
120		"1:\n\t"
121		"ldc r1l,ccr\n\t"
122		"sub.l %0,%0\n\t"
123		"2:\n\t"
124		: "=r" (count),"=m" (*count)
125		: "g"(sem),"m"(*count)
126		: "cc", "er1", "er2", "er3");
127	return (int)count;
128}
129
130static inline int down_trylock(struct semaphore * sem)
131{
132	register atomic_t *count asm("er0");
133
134	count = &(sem->count);
135	__asm__ __volatile__(
136		"stc ccr,r3l\n\t"
137		"orc #0x80,ccr\n\t"
138		"mov.l %3,er2\n\t"
139		"dec.l #1,er2\n\t"
140		"mov.l er2,%0\n\t"
141		"bpl 1f\n\t"
142		"ldc r3l,ccr\n\t"
143		"jmp @3f\n\t"
144		LOCK_SECTION_START(".align 2\n\t")
145		"3:\n\t"
146		"mov.l %2,er0\n\t"
147		"jsr @___down_trylock\n\t"
148		"jmp @2f\n\t"
149		LOCK_SECTION_END
150		"1:\n\t"
151		"ldc r3l,ccr\n\t"
152		"sub.l %1,%1\n"
153		"2:"
154		: "=m" (*count),"=r"(count)
155		: "g"(sem),"m"(*count)
156		: "cc", "er1","er2", "er3");
157	return (int)count;
158}
159
160/*
161 * Note! This is subtle. We jump to wake people up only if
162 * the semaphore was negative (== somebody was waiting on it).
163 * The default case (no contention) will result in NO
164 * jumps for both down() and up().
165 */
166static inline void up(struct semaphore * sem)
167{
168	register atomic_t *count asm("er0");
169
170	count = &(sem->count);
171	__asm__ __volatile__(
172		"stc ccr,r3l\n\t"
173		"orc #0x80,ccr\n\t"
174		"mov.l %2,er1\n\t"
175		"inc.l #1,er1\n\t"
176		"mov.l er1,%0\n\t"
177		"ldc r3l,ccr\n\t"
178		"sub.l er2,er2\n\t"
179		"cmp.l er2,er1\n\t"
180		"bgt 1f\n\t"
181		"mov.l %1,er0\n\t"
182		"jsr @___up\n"
183		"1:"
184		: "=m"(*count)
185		: "g"(sem),"m"(*count)
186		: "cc", "er1", "er2", "er3");
187}
188
189#endif /* __ASSEMBLY__ */
190
191#endif
192