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
  22 extern spinlock_t rtc_lock;
  23
  24 /*
  25  * board specific routines required by time_init().
  26  */
  27 extern 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  */
  33 extern 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  */
  39 extern int (*perf_irq)(void);
  40 extern int __weak get_c0_perfcount_int(void);
  41
  42 /*
  43  * Initialize the calling CPU's compare interrupt as clockevent device
  44  */
  45 extern unsigned int get_c0_compare_int(void);
  46 extern int r4k_clockevent_init(void);
  47
  48 static 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  */
  60 extern int init_r4k_clocksource(void);
  61
  62 static 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
  71 static 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 */