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
  24 /*
  25  * RTC ops.  By default, they point to no-RTC functions.
  26  *      rtc_get_time - mktime(year, mon, day, hour, min, sec) in seconds.
  27  *      rtc_set_time - reverse the above translation and set time to RTC.
  28  *      rtc_set_mmss - similar to rtc_set_time, but only min and sec need
  29  *                      to be set.  Used by RTC sync-up.
  30  */
  31 extern unsigned long (*rtc_get_time)(void);
  32 extern int (*rtc_set_time)(unsigned long);
  33 extern int (*rtc_set_mmss)(unsigned long);
  34
  35 /*
  36  * Timer interrupt functions.
  37  * mips_timer_state is needed for high precision timer calibration.
  38  * mips_timer_ack may be NULL if the interrupt is self-recoverable.
  39  */
  40 extern int (*mips_timer_state)(void);
  41 extern void (*mips_timer_ack)(void);
  42
  43 /*
  44  * High precision timer functions.
  45  * If mips_hpt_read is NULL, an R4k-compatible timer setup is attempted.
  46  */
  47 extern unsigned int (*mips_hpt_read)(void);
  48 extern void (*mips_hpt_init)(unsigned int);
  49
  50 /*
  51  * to_tm() converts system time back to (year, mon, day, hour, min, sec).
  52  * It is intended to help implement rtc_set_time() functions.
  53  * Copied from PPC implementation.
  54  */
  55 extern void to_tm(unsigned long tim, struct rtc_time *tm);
  56
  57 /*
  58  * do_gettimeoffset(). By default, this func pointer points to
  59  * do_null_gettimeoffset(), which leads to the same resolution as HZ.
  60  * Higher resolution versions are available, which give ~1us resolution.
  61  */
  62 extern unsigned long (*do_gettimeoffset)(void);
  63
  64 /*
  65  * high-level timer interrupt routines.
  66  */
  67 extern irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  68
  69 /*
  70  * the corresponding low-level timer interrupt routine.
  71  */
  72 extern asmlinkage void ll_timer_interrupt(int irq, struct pt_regs *regs);
  73
  74 /*
  75  * profiling and process accouting is done separately in local_timer_interrupt
  76  */
  77 extern void local_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  78 extern asmlinkage void ll_local_timer_interrupt(int irq, struct pt_regs *regs);
  79
  80 /*
  81  * board specific routines required by time_init().
  82  * board_time_init is defaulted to NULL and can remain so.
  83  * board_timer_setup must be setup properly in machine setup routine.
  84  */
  85 struct irqaction;
  86 extern void (*board_time_init)(void);
  87 extern void (*board_timer_setup)(struct irqaction *irq);
  88
  89 /*
  90  * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
  91  * counter as a timer interrupt source; otherwise it can be set up
  92  * automagically with an aid of mips_timer_state.
  93  */
  94 extern unsigned int mips_hpt_frequency;
  95
  96 #endif /* _ASM_TIME_H */