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/*
* arch/sh/boards/landisk/rtc.c -- RTC support
*
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
*/
/*
* modifed by kogiidena
* 2005.09.16
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/bcd.h>
#include <asm/rtc.h>
extern spinlock_t rtc_lock;
extern void
rs5c313_set_cmos_time(unsigned int BCD_yr, unsigned int BCD_mon,
unsigned int BCD_day, unsigned int BCD_hr,
unsigned int BCD_min, unsigned int BCD_sec);
extern unsigned long
rs5c313_get_cmos_time(unsigned int *BCD_yr, unsigned int *BCD_mon,
unsigned int *BCD_day, unsigned int *BCD_hr,
unsigned int *BCD_min, unsigned int *BCD_sec);
void landisk_rtc_gettimeofday(struct timespec *tv)
{
unsigned int BCD_yr, BCD_mon, BCD_day, BCD_hr, BCD_min, BCD_sec;
unsigned long flags;
spin_lock_irqsave(&rtc_lock, flags);
tv->tv_sec = rs5c313_get_cmos_time
(&BCD_yr, &BCD_mon, &BCD_day, &BCD_hr, &BCD_min, &BCD_sec);
tv->tv_nsec = 0;
spin_unlock_irqrestore(&rtc_lock, flags);
}
int landisk_rtc_settimeofday(const time_t secs)
{
int retval = 0;
int real_seconds, real_minutes, cmos_minutes;
unsigned long flags;
unsigned long nowtime = secs;
unsigned int BCD_yr, BCD_mon, BCD_day, BCD_hr, BCD_min, BCD_sec;
spin_lock_irqsave(&rtc_lock, flags);
rs5c313_get_cmos_time
(&BCD_yr, &BCD_mon, &BCD_day, &BCD_hr, &BCD_min, &BCD_sec);
cmos_minutes = BCD_min;
BCD_TO_BIN(cmos_minutes);
/*
* since we're only adjusting minutes and seconds,
* don't interfere with hour overflow. This avoids
* messing with unknown time zones but requires your
* RTC not to be off by more than 15 minutes
*/
real_seconds = nowtime % 60;
real_minutes = nowtime / 60;
if (((abs(real_minutes - cmos_minutes) + 15) / 30) & 1)
real_minutes += 30; /* correct for half hour time zone */
real_minutes %= 60;
if (abs(real_minutes - cmos_minutes) < 30) {
BIN_TO_BCD(real_seconds);
BIN_TO_BCD(real_minutes);
rs5c313_set_cmos_time(BCD_yr, BCD_mon, BCD_day, BCD_hr,
real_minutes, real_seconds);
} else {
printk(KERN_WARNING
"set_rtc_time: can't update from %d to %d\n",
cmos_minutes, real_minutes);
retval = -1;
}
spin_unlock_irqrestore(&rtc_lock, flags);
return retval;
}
void landisk_time_init(void)
{
rtc_sh_get_time = landisk_rtc_gettimeofday;
rtc_sh_set_time = landisk_rtc_settimeofday;
}
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