Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
time.h
Go to the documentation of this file.
1 /*
2  * Copyright (C) 2001, 2002, MontaVista Software Inc.
3  * Author: Jun Sun, [email protected] or [email protected]
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 #ifdef CONFIG_CEVT_R4K_LIB
54 extern unsigned int __weak get_c0_compare_int(void);
55 extern int r4k_clockevent_init(void);
56 #endif
57 
58 static inline int mips_clockevent_init(void)
59 {
60 #ifdef CONFIG_MIPS_MT_SMTC
61  extern int smtc_clockevent_init(void);
62 
63  return smtc_clockevent_init();
64 #elif defined(CONFIG_CEVT_R4K)
65  return r4k_clockevent_init();
66 #else
67  return -ENXIO;
68 #endif
69 }
70 
71 /*
72  * Initialize the count register as a clocksource
73  */
74 #ifdef CONFIG_CSRC_R4K_LIB
75 extern int init_r4k_clocksource(void);
76 #endif
77 
78 static inline int init_mips_clocksource(void)
79 {
80 #ifdef CONFIG_CSRC_R4K
81  return init_r4k_clocksource();
82 #else
83  return 0;
84 #endif
85 }
86 
87 static inline void clockevent_set_clock(struct clock_event_device *cd,
88  unsigned int clock)
89 {
90  clockevents_calc_mult_shift(cd, clock, 4);
91 }
92 
93 #endif /* _ASM_TIME_H */