include/asm-mips/time.h

   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  * Timer interrupt functions.
  35  * mips_timer_state is needed for high precision timer calibration.
  36  */
  37 extern int (*mips_timer_state)(void);
  38
  39 /*
  40  * board specific routines required by time_init().
  41  */
  42 extern void plat_time_init(void);
  43
  44 /*
  45  * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
  46  * counter as a timer interrupt source; otherwise it can be set up
  47  * automagically with an aid of mips_timer_state.
  48  */
  49 extern unsigned int mips_hpt_frequency;
  50
  51 /*
  52  * The performance counter IRQ on MIPS is a close relative to the timer IRQ
  53  * so it lives here.
  54  */
  55 extern int (*perf_irq)(void);
  56
  57 /*
  58  * Initialize the calling CPU's compare interrupt as clockevent device
  59  */
  60 #ifdef CONFIG_CEVT_R4K
  61 extern int mips_clockevent_init(void);
  62 extern unsigned int __weak get_c0_compare_int(void);
  63 #else
  64 static inline int mips_clockevent_init(void)
  65 {
  66         return -ENXIO;
  67 }
  68 #endif
  69
  70 /*
  71  * Initialize the count register as a clocksource
  72  */
  73 #ifdef CONFIG_CEVT_R4K
  74 extern void init_mips_clocksource(void);
  75 #else
  76 static inline void init_mips_clocksource(void)
  77 {
  78 }
  79 #endif
  80
  81 extern void clocksource_set_clock(struct clocksource *cs, unsigned int clock);
  82 extern void clockevent_set_clock(struct clock_event_device *cd,
  83                 unsigned int clock);
  84
  85 #endif /* _ASM_TIME_H */