1/*
2 * Copyright (C) 2001, 2002, MontaVista Software Inc.
3 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
4 * Copyright (c) 2003  Maciej W. Rozycki
5 *
6 * include/asm-mips/time.h
7 *     header file for the new style time.c file and time services.
8 *
9 * This program is free software; you can redistribute	it and/or modify it
10 * under  the terms of	the GNU General	 Public License as published by the
11 * Free Software Foundation;  either version 2 of the  License, or (at your
12 * option) any later version.
13 */
14#ifndef _ASM_TIME_H
15#define _ASM_TIME_H
16
17#include <linux/rtc.h>
18#include <linux/spinlock.h>
19#include <linux/clockchips.h>
20#include <linux/clocksource.h>
21
22extern spinlock_t rtc_lock;
23
24/*
25 * RTC ops.  By default, they point to weak no-op RTC functions.
26 *	rtc_mips_set_time - reverse the above translation and set time to RTC.
27 *	rtc_mips_set_mmss - similar to rtc_set_time, but only min and sec need
28 *			to be set.  Used by RTC sync-up.
29 */
30extern int rtc_mips_set_time(unsigned long);
31extern int rtc_mips_set_mmss(unsigned long);
32
33/*
34 * board specific routines required by time_init().
35 */
36extern void plat_time_init(void);
37
38/*
39 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
40 * counter as a timer interrupt source.
41 */
42extern unsigned int mips_hpt_frequency;
43
44/*
45 * The performance counter IRQ on MIPS is a close relative to the timer IRQ
46 * so it lives here.
47 */
48extern int (*perf_irq)(void);
49
50/*
51 * Initialize the calling CPU's compare interrupt as clockevent device
52 */
53extern unsigned int __weak get_c0_compare_int(void);
54extern int r4k_clockevent_init(void);
55extern int gic_clockevent_init(void);
56
57static inline int mips_clockevent_init(void)
58{
59#if   defined(CONFIG_CEVT_GIC)
60	return (gic_clockevent_init() | r4k_clockevent_init());
61#elif defined(CONFIG_CEVT_R4K)
62	return r4k_clockevent_init();
63#else
64	return -ENXIO;
65#endif
66}
67
68/*
69 * Initialize the count register as a clocksource
70 */
71extern int init_r4k_clocksource(void);
72
73static inline int init_mips_clocksource(void)
74{
75#ifdef CONFIG_CSRC_R4K
76	return init_r4k_clocksource();
77#else
78	return 0;
79#endif
80}
81
82static inline void clockevent_set_clock(struct clock_event_device *cd,
83					unsigned int clock)
84{
85	clockevents_calc_mult_shift(cd, clock, 4);
86}
87
88#endif /* _ASM_TIME_H */
89