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  * Please refer to Documentation/mips/time.README.
  15  */
  16 #ifndef _ASM_TIME_H
  17 #define _ASM_TIME_H
  18
  19 #include <linux/interrupt.h>
  20 #include <linux/linkage.h>
  21 #include <linux/ptrace.h>
  22 #include <linux/rtc.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/clockchips.h>
  25 #include <linux/clocksource.h>
  26
  27 extern spinlock_t rtc_lock;
  28
  29 /*
  30  * RTC ops.  By default, they point to weak no-op RTC functions.
  31  *      rtc_mips_set_time - reverse the above translation and set time to RTC.
  32  *      rtc_mips_set_mmss - similar to rtc_set_time, but only min and sec need
  33  *                      to be set.  Used by RTC sync-up.
  34  */
  35 extern int rtc_mips_set_time(unsigned long);
  36 extern int rtc_mips_set_mmss(unsigned long);
  37
  38 /*
  39  * Timer interrupt functions.
  40  * mips_timer_state is needed for high precision timer calibration.
  41  * mips_timer_ack may be NULL if the interrupt is self-recoverable.
  42  */
  43 extern int (*mips_timer_state)(void);
  44
  45 /*
  46  * High precision timer clocksource.
  47  * If .read is NULL, an R4k-compatible timer setup is attempted.
  48  */
  49 extern struct clocksource clocksource_mips;
  50
  51 /*
  52  * profiling and process accouting is done separately in local_timer_interrupt
  53  */
  54 extern void local_timer_interrupt(int irq, void *dev_id);
  55
  56 /*
  57  * board specific routines required by time_init().
  58  */
  59 struct irqaction;
  60 extern void plat_time_init(void);
  61 extern void plat_timer_setup(struct irqaction *irq);
  62
  63 /*
  64  * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
  65  * counter as a timer interrupt source; otherwise it can be set up
  66  * automagically with an aid of mips_timer_state.
  67  */
  68 extern unsigned int mips_hpt_frequency;
  69
  70 /*
  71  * The performance counter IRQ on MIPS is a close relative to the timer IRQ
  72  * so it lives here.
  73  */
  74 extern int (*perf_irq)(void);
  75
  76 /*
  77  * Initialize the calling CPU's compare interrupt as clockevent device
  78  */
  79 #ifdef CONFIG_CEVT_R4K
  80 extern void mips_clockevent_init(void);
  81 #else
  82 static inline void mips_clockevent_init(void)
  83 {
  84 }
  85 #endif
  86
  87 extern void clocksource_set_clock(struct clocksource *cs, unsigned int clock);
  88 extern void clockevent_set_clock(struct clock_event_device *cd,
  89                 unsigned int clock);
  90
  91 #endif /* _ASM_TIME_H */