1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4  */
5 
6 #ifndef __ASM_SPINLOCK_TYPES_H
7 #define __ASM_SPINLOCK_TYPES_H
8 
9 typedef struct {
10 	volatile unsigned int slock;
11 } arch_spinlock_t;
12 
13 #define __ARCH_SPIN_LOCK_UNLOCKED__	0
14 #define __ARCH_SPIN_LOCK_LOCKED__	1
15 
16 #define __ARCH_SPIN_LOCK_UNLOCKED	{ __ARCH_SPIN_LOCK_UNLOCKED__ }
17 #define __ARCH_SPIN_LOCK_LOCKED		{ __ARCH_SPIN_LOCK_LOCKED__ }
18 
19 /*
20  * Unlocked     : 0x0100_0000
21  * Read lock(s) : 0x00FF_FFFF to 0x01  (Multiple Readers decrement it)
22  * Write lock   : 0x0, but only if prior value is "unlocked" 0x0100_0000
23  */
24 typedef struct {
25 	volatile unsigned int	counter;
26 #ifndef CONFIG_ARC_HAS_LLSC
27 	arch_spinlock_t		lock_mutex;
28 #endif
29 } arch_rwlock_t;
30 
31 #define __ARCH_RW_LOCK_UNLOCKED__	0x01000000
32 #define __ARCH_RW_LOCK_UNLOCKED		{ .counter = __ARCH_RW_LOCK_UNLOCKED__ }
33 
34 #endif
35