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
22 extern 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 */
30 extern int rtc_mips_set_time(unsigned long);
31 extern int rtc_mips_set_mmss(unsigned long);
32
33 /*
34 * board specific routines required by time_init().
35 */
36 extern 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 */
42 extern 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 */
48 extern int (*perf_irq)(void);
49
50 /*
51 * Initialize the calling CPU's compare interrupt as clockevent device
52 */
53 extern unsigned int __weak get_c0_compare_int(void);
54 extern int r4k_clockevent_init(void);
55 extern int gic_clockevent_init(void);
56
mips_clockevent_init(void)57 static 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 */
71 extern int init_r4k_clocksource(void);
72
init_mips_clocksource(void)73 static 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
clockevent_set_clock(struct clock_event_device * cd,unsigned int clock)82 static 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