1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) 2001, 2002, MontaVista Software Inc.
4 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
5 * Copyright (c) 2003 Maciej W. Rozycki
6 *
7 * include/asm-mips/time.h
8 * header file for the new style time.c file and time services.
9 */
10 #ifndef _ASM_TIME_H
11 #define _ASM_TIME_H
12
13 #include <linux/rtc.h>
14 #include <linux/spinlock.h>
15 #include <linux/clockchips.h>
16 #include <linux/clocksource.h>
17
18 extern spinlock_t rtc_lock;
19
20 /*
21 * board specific routines required by time_init().
22 */
23 extern void plat_time_init(void);
24
25 /*
26 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
27 * counter as a timer interrupt source.
28 */
29 extern unsigned int mips_hpt_frequency;
30
31 /*
32 * The performance counter IRQ on MIPS is a close relative to the timer IRQ
33 * so it lives here.
34 */
35 extern int (*perf_irq)(void);
36 extern int __weak get_c0_perfcount_int(void);
37
38 /*
39 * Initialize the calling CPU's compare interrupt as clockevent device
40 */
41 extern unsigned int get_c0_compare_int(void);
42 extern int r4k_clockevent_init(void);
43
44 static inline int mips_clockevent_init(void)
45 {
46 #ifdef CONFIG_CEVT_R4K
47 return r4k_clockevent_init();
48 #else
49 return -ENXIO;
50 #endif
51 }
52
53 /*
54 * Initialize the count register as a clocksource
55 */
56 extern int init_r4k_clocksource(void);
57
58 static inline int init_mips_clocksource(void)
59 {
60 #ifdef CONFIG_CSRC_R4K
61 return init_r4k_clocksource();
62 #else
63 return 0;
64 #endif
65 }
66
67 static inline void clockevent_set_clock(struct clock_event_device *cd,
68 unsigned int clock)
69 {
70 clockevents_calc_mult_shift(cd, clock, 4);
71 }
72
73 #endif /* _ASM_TIME_H */
74
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