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
  25 extern spinlock_t rtc_lock;
  26
  27 /*
  28  * RTC ops.  By default, they point to no-RTC functions.
  29  *      rtc_get_time - mktime(year, mon, day, hour, min, sec) in seconds.
  30  *      rtc_set_time - reverse the above translation and set time to RTC.
  31  *      rtc_set_mmss - similar to rtc_set_time, but only min and sec need
  32  *                      to be set.  Used by RTC sync-up.
  33  */
  34 extern unsigned long (*rtc_get_time)(void);
  35 extern int (*rtc_set_time)(unsigned long);
  36 extern int (*rtc_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 extern void (*mips_timer_ack)(void);
  45
  46 /*
  47  * High precision timer functions.
  48  * If mips_hpt_read is NULL, an R4k-compatible timer setup is attempted.
  49  */
  50 extern unsigned int (*mips_hpt_read)(void);
  51 extern void (*mips_hpt_init)(unsigned int);
  52
  53 /*
  54  * to_tm() converts system time back to (year, mon, day, hour, min, sec).
  55  * It is intended to help implement rtc_set_time() functions.
  56  * Copied from PPC implementation.
  57  */
  58 extern void to_tm(unsigned long tim, struct rtc_time *tm);
  59
  60 /*
  61  * do_gettimeoffset(). By default, this func pointer points to
  62  * do_null_gettimeoffset(), which leads to the same resolution as HZ.
  63  * Higher resolution versions are available, which give ~1us resolution.
  64  */
  65 extern unsigned long (*do_gettimeoffset)(void);
  66
  67 /*
  68  * high-level timer interrupt routines.
  69  */
  70 extern irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  71
  72 /*
  73  * the corresponding low-level timer interrupt routine.
  74  */
  75 extern asmlinkage void ll_timer_interrupt(int irq, struct pt_regs *regs);
  76
  77 /*
  78  * profiling and process accouting is done separately in local_timer_interrupt
  79  */
  80 extern void local_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  81 extern asmlinkage void ll_local_timer_interrupt(int irq, struct pt_regs *regs);
  82
  83 /*
  84  * board specific routines required by time_init().
  85  * board_time_init is defaulted to NULL and can remain so.
  86  * board_timer_setup must be setup properly in machine setup routine.
  87  */
  88 struct irqaction;
  89 extern void (*board_time_init)(void);
  90 extern void (*board_timer_setup)(struct irqaction *irq);
  91
  92 /*
  93  * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
  94  * counter as a timer interrupt source; otherwise it can be set up
  95  * automagically with an aid of mips_timer_state.
  96  */
  97 extern unsigned int mips_hpt_frequency;
  98
  99 #endif /* _ASM_TIME_H */