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  * 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  * board specific routines required by time_init().
  35  */
  36 extern 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  */
  42 extern 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  */
  48 extern int (*perf_irq)(void);
  49 extern int __weak get_c0_perfcount_int(void);
  50
  51 /*
  52  * Initialize the calling CPU's compare interrupt as clockevent device
  53  */
  54 extern unsigned int get_c0_compare_int(void);
  55 extern int r4k_clockevent_init(void);
  56
  57 static inline int mips_clockevent_init(void)
  58 {
  59 #ifdef CONFIG_CEVT_R4K
  60         return r4k_clockevent_init();
  61 #else
  62         return -ENXIO;
  63 #endif
  64 }
  65
  66 /*
  67  * Initialize the count register as a clocksource
  68  */
  69 extern int init_r4k_clocksource(void);
  70
  71 static inline int init_mips_clocksource(void)
  72 {
  73 #ifdef CONFIG_CSRC_R4K
  74         return init_r4k_clocksource();
  75 #else
  76         return 0;
  77 #endif
  78 }
  79
  80 static inline void clockevent_set_clock(struct clock_event_device *cd,
  81                                         unsigned int clock)
  82 {
  83         clockevents_calc_mult_shift(cd, clock, 4);
  84 }
  85
  86 #endif /* _ASM_TIME_H */