1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SPINLOCK_TYPES_H
3#define __ASM_SPINLOCK_TYPES_H
4
5#define __ARCH_SPIN_LOCK_UNLOCKED_VAL	0x1a46
6
7#define SPINLOCK_BREAK_INSN	0x0000c006	/* break 6,6 */
8
9#ifndef __ASSEMBLY__
10
11typedef struct {
12	volatile unsigned int lock[4];
13# define __ARCH_SPIN_LOCK_UNLOCKED	\
14	{ { __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL, \
15	    __ARCH_SPIN_LOCK_UNLOCKED_VAL, __ARCH_SPIN_LOCK_UNLOCKED_VAL } }
16} arch_spinlock_t;
17
18
19/* counter:
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 */
24typedef struct {
25	arch_spinlock_t		lock_mutex;
26	volatile unsigned int	counter;
27} arch_rwlock_t;
28
29#endif /* __ASSEMBLY__ */
30
31#define __ARCH_RW_LOCK_UNLOCKED__       0x01000000
32#define __ARCH_RW_LOCK_UNLOCKED         { .lock_mutex = __ARCH_SPIN_LOCK_UNLOCKED, \
33					.counter = __ARCH_RW_LOCK_UNLOCKED__ }
34
35#endif
36