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 * board specific routines required by time_init().
  26 */
  27extern void plat_time_init(void);
  28
  29/*
  30 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
  31 * counter as a timer interrupt source.
  32 */
  33extern unsigned int mips_hpt_frequency;
  34
  35/*
  36 * The performance counter IRQ on MIPS is a close relative to the timer IRQ
  37 * so it lives here.
  38 */
  39extern int (*perf_irq)(void);
  40extern int __weak get_c0_perfcount_int(void);
  41
  42/*
  43 * Initialize the calling CPU's compare interrupt as clockevent device
  44 */
  45extern unsigned int get_c0_compare_int(void);
  46extern int r4k_clockevent_init(void);
  47
  48static inline int mips_clockevent_init(void)
  49{
  50#ifdef CONFIG_CEVT_R4K
  51        return r4k_clockevent_init();
  52#else
  53        return -ENXIO;
  54#endif
  55}
  56
  57/*
  58 * Initialize the count register as a clocksource
  59 */
  60extern int init_r4k_clocksource(void);
  61
  62static inline int init_mips_clocksource(void)
  63{
  64#ifdef CONFIG_CSRC_R4K
  65        return init_r4k_clocksource();
  66#else
  67        return 0;
  68#endif
  69}
  70
  71static inline void clockevent_set_clock(struct clock_event_device *cd,
  72                                        unsigned int clock)
  73{
  74        clockevents_calc_mult_shift(cd, clock, 4);
  75}
  76
  77#endif /* _ASM_TIME_H */
  78