kernel-ark/include/asm-mips/time.h

/*
 * Copyright (C) 2001, 2002, MontaVista Software Inc.
 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 * Copyright (c) 2003  Maciej W. Rozycki
 *
 * include/asm-mips/time.h
 *     header file for the new style time.c file and time services.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 * Please refer to Documentation/mips/time.README.
 */
#ifndef _ASM_TIME_H
#define _ASM_TIME_H

#include <linux/interrupt.h>
#include <linux/linkage.h>
#include <linux/ptrace.h>
#include <linux/rtc.h>
#include <linux/spinlock.h>

extern spinlock_t rtc_lock;

/*
 * RTC ops.  By default, they point to no-RTC functions.
 *	rtc_mips_get_time - mktime(year, mon, day, hour, min, sec) in seconds.
 *	rtc_mips_set_time - reverse the above translation and set time to RTC.
 *	rtc_mips_set_mmss - similar to rtc_set_time, but only min and sec need
 *			to be set.  Used by RTC sync-up.
 */
extern unsigned long (*rtc_mips_get_time)(void);
extern int (*rtc_mips_set_time)(unsigned long);
extern int (*rtc_mips_set_mmss)(unsigned long);

/*
 * Timer interrupt functions.
 * mips_timer_state is needed for high precision timer calibration.
 * mips_timer_ack may be NULL if the interrupt is self-recoverable.
 */
extern int (*mips_timer_state)(void);
extern void (*mips_timer_ack)(void);

/*
 * High precision timer functions.
 * If mips_hpt_read is NULL, an R4k-compatible timer setup is attempted.
 */
extern unsigned int (*mips_hpt_read)(void);
extern void (*mips_hpt_init)(unsigned int);

/*
 * to_tm() converts system time back to (year, mon, day, hour, min, sec).
 * It is intended to help implement rtc_set_time() functions.
 * Copied from PPC implementation.
 */
extern void to_tm(unsigned long tim, struct rtc_time *tm);

/*
 * do_gettimeoffset(). By default, this func pointer points to
 * do_null_gettimeoffset(), which leads to the same resolution as HZ.
 * Higher resolution versions are available, which give ~1us resolution.
 */
extern unsigned long (*do_gettimeoffset)(void);

/*
 * high-level timer interrupt routines.
 */
extern irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);

/*
 * the corresponding low-level timer interrupt routine.
 */
extern asmlinkage void ll_timer_interrupt(int irq, struct pt_regs *regs);

/*
 * profiling and process accouting is done separately in local_timer_interrupt
 */
extern void local_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
extern asmlinkage void ll_local_timer_interrupt(int irq, struct pt_regs *regs);

/*
 * board specific routines required by time_init().
 * board_time_init is defaulted to NULL and can remain so.
 * plat_timer_setup must be setup properly in machine setup routine.
 */
struct irqaction;
extern void (*board_time_init)(void);
extern void plat_timer_setup(struct irqaction *irq);

/*
 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
 * counter as a timer interrupt source; otherwise it can be set up
 * automagically with an aid of mips_timer_state.
 */
extern unsigned int mips_hpt_frequency;

#endif /* _ASM_TIME_H */