LXR linux/arch/mips/include/asm/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
  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 */
  53#ifdef CONFIG_CEVT_R4K_LIB
  54extern unsigned int __weak get_c0_compare_int(void);
  55extern int r4k_clockevent_init(void);
  56#endif
  57
  58static 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
  75extern int init_r4k_clocksource(void);
  76#endif
  77
  78static 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
  87static 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 */
  94