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/*
 *  linux/arch/or32/kernel/time.c
 *
 *  or32 version
 *
 *  Copied/hacked from:
 *
 *  linux/arch/m68knommu/kernel/time.c
 *
 *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
 *
 * This file contains the m68k-specific time handling details.
 * Most of the stuff is located in the machine specific files.
 */
 
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
 
#include <asm/machdep.h>
#include <asm/segment.h>
#include <asm/io.h>
 
#include <linux/timex.h>
 
 
static inline int set_rtc_mmss(unsigned long nowtime)
{
  if (mach_set_clock_mmss)
    return mach_set_clock_mmss (nowtime);
  return -1;
}
 
/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "do_timer()" routine every clocktick
 */
/* void timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
*/
void timer_interrupt(struct pt_regs * regs)
{
	/* last time the cmos clock got updated */
	static long last_rtc_update=0;
 
	/* may need to kick the hardware timer */
	if (mach_tick)
	  mach_tick();
 
	do_timer(regs);
 
	/*
	 * If we have an externally synchronized Linux clock, then update
	 * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
	 * called as close as possible to 500 ms before the new second starts.
	 */
	if (time_state != TIME_BAD && xtime.tv_sec > last_rtc_update + 660 &&
	    xtime.tv_usec > 500000 - (tick >> 1) &&
	    xtime.tv_usec < 500000 + (tick >> 1)) {
	  if (set_rtc_mmss(xtime.tv_sec) == 0)
	    last_rtc_update = xtime.tv_sec;
	  else
	    last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
	}
 
}
 
/*
 * This version of gettimeofday has near microsecond resolution.
 */
void do_gettimeofday(struct timeval *tv)
{
	unsigned long flags;
 
	save_flags(flags);
	cli();
	*tv = xtime;
	if (mach_gettimeoffset) {
	  tv->tv_usec += mach_gettimeoffset();
	  if (tv->tv_usec >= 1000000) {
	    tv->tv_usec -= 1000000;
	    tv->tv_sec++;
	  }
	}
	restore_flags(flags);
}
 
void do_settimeofday(struct timeval *tv)
{
	cli();
	/* This is revolting. We need to set the xtime.tv_usec
	 * correctly. However, the value in this location is
	 * is value at the last tick.
	 * Discover what correction gettimeofday
	 * would have done, and then undo it!
	 */
	if (mach_gettimeoffset)
	  tv->tv_usec -= mach_gettimeoffset();
 
	if (tv->tv_usec < 0) {
		tv->tv_usec += 1000000;
		tv->tv_sec--;
	}
 
	xtime = *tv;
	time_state = TIME_BAD;
	time_maxerror = MAXPHASE;
	time_esterror = MAXPHASE;
	sti();
}
 
void __init time_init(void)
{
	unsigned int year, mon, day, hour, min, sec;
 
	extern void arch_gettod(int *year, int *mon, int *day, int *hour,
				int *min, int *sec);
 
	arch_gettod (&year, &mon, &day, &hour, &min, &sec);
 
	if ((year += 1900) < 1970)
		year += 100;
	xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
	xtime.tv_usec = 0;
 
 
	if (mach_sched_init)
		mach_sched_init(timer_interrupt);
}