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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);
55
56static inline int mips_clockevent_init(void)
57{
58#ifdef CONFIG_MIPS_MT_SMTC
59 extern int smtc_clockevent_init(void);
60
61 return smtc_clockevent_init();
62#elif defined(CONFIG_CEVT_R4K)
63 return r4k_clockevent_init();
64#else
65 return -ENXIO;
66#endif
67}
68
69/*
70 * Initialize the count register as a clocksource
71 */
72#ifdef CONFIG_CSRC_R4K
73extern int init_r4k_clocksource(void);
74#endif
75
76static inline int init_mips_clocksource(void)
77{
78#ifdef CONFIG_CSRC_R4K
79 return init_r4k_clocksource();
80#else
81 return 0;
82#endif
83}
84
85static inline void clockevent_set_clock(struct clock_event_device *cd,
86 unsigned int clock)
87{
88 clockevents_calc_mult_shift(cd, clock, 4);
89}
90
91#endif /* _ASM_TIME_H */