LXR linux-old/include/asm-mips64/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 */
  15
  16/*
  17 * Please refer to Documentation/mips/time.README.
  18 */
  19
  20#ifndef _ASM_TIME_H
  21#define _ASM_TIME_H
  22
  23#include <linux/ptrace.h>               /* for struct pt_regs */
  24#include <linux/linkage.h>              /* for asmlinkage */
  25#include <linux/rtc.h>                  /* for struct rtc_time */
  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 */
  34extern unsigned long (*rtc_get_time)(void);
  35extern int (*rtc_set_time)(unsigned long);
  36extern 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 */
  43extern int (*mips_timer_state)(void);
  44extern 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 */
  50extern unsigned int (*mips_hpt_read)(void);
  51extern 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 */
  58extern 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 */
  65extern unsigned long (*do_gettimeoffset)(void);
  66
  67/*
  68 * high-level timer interrupt routines.
  69 */
  70extern void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  71
  72/*
  73 * the corresponding low-level timer interrupt routine.
  74 */
  75extern 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 */
  80extern void local_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  81extern 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 */
  88struct irqaction;
  89extern void (*board_time_init)(void);
  90extern 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 */
  97extern unsigned int mips_hpt_frequency;
  98
  99#endif /* _ASM_TIME_H */
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