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 #include <asm/gic.h>
22
23 extern spinlock_t rtc_lock;
24
25 /*
26 * RTC ops. By default, they point to weak no-op RTC functions.
27 * rtc_mips_set_time - reverse the above translation and set time to RTC.
28 * rtc_mips_set_mmss - similar to rtc_set_time, but only min and sec need
29 * to be set. Used by RTC sync-up.
30 */
31 extern int rtc_mips_set_time(unsigned long);
32 extern int rtc_mips_set_mmss(unsigned long);
33
34 /*
35 * board specific routines required by time_init().
36 */
37 extern void plat_time_init(void);
38
39 /*
40 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
41 * counter as a timer interrupt source.
42 */
43 extern unsigned int mips_hpt_frequency;
44
45 /*
46 * The performance counter IRQ on MIPS is a close relative to the timer IRQ
47 * so it lives here.
48 */
49 extern int (*perf_irq)(void);
50
51 /*
52 * Initialize the calling CPU's compare interrupt as clockevent device
53 */
54 extern unsigned int __weak get_c0_compare_int(void);
55 extern int r4k_clockevent_init(void);
56 extern int smtc_clockevent_init(void);
57
mips_clockevent_init(void)58 static inline int mips_clockevent_init(void)
59 {
60 #ifdef CONFIG_MIPS_MT_SMTC
61 return smtc_clockevent_init();
62 #elif defined(CONFIG_CEVT_GIC)
63 extern int gic_clockevent_init(void);
64
65 gic_clockevent_init();
66 return r4k_clockevent_init();
67 #elif defined(CONFIG_CEVT_R4K)
68 return r4k_clockevent_init();
69 #else
70 return -ENXIO;
71 #endif
72 }
73
74 /*
75 * Initialize the count register as a clocksource
76 */
77 extern int init_r4k_clocksource(void);
78
init_mips_clocksource(void)79 static inline int init_mips_clocksource(void)
80 {
81 #ifdef CONFIG_CSRC_R4K
82 return init_r4k_clocksource();
83 #else
84 return 0;
85 #endif
86 }
87
clockevent_set_clock(struct clock_event_device * cd,unsigned int clock)88 static inline void clockevent_set_clock(struct clock_event_device *cd,
89 unsigned int clock)
90 {
91 clockevents_calc_mult_shift(cd, clock, 4);
92 }
93
94 #endif /* _ASM_TIME_H */
95