Exemplo n.º 1
0
/*
 *  Bring up the timer at 100 Hz.  
 */
void __init swarm_time_init(void)
{
	unsigned int flags;
	int status;

	/* Set up the scd general purpose timer 0 to cpu 0 */
	sb1250_time_init();

	/* Establish communication with the Xicor 1241 RTC */
	/* XXXKW how do I share the SMBus with the I2C subsystem? */

	out64(K_SMB_FREQ_400KHZ, SMB_CSR(R_SMB_FREQ));
	out64(0, SMB_CSR(R_SMB_CONTROL));

	if ((status = xicor_read(X1241REG_SR_RTCF)) < 0) {
		printk("x1241: couldn't detect on SWARM SMBus 1\n");
	} else {
		if (status & X1241REG_SR_RTCF)
			printk("x1241: battery failed -- time is probably wrong\n");
		write_lock_irqsave (&xtime_lock, flags);
		xtime.tv_sec = get_swarm_time();
		xtime.tv_usec = 0;
		write_unlock_irqrestore(&xtime_lock, flags);
	}
}
int xicor_set_time(unsigned long t)
{
	struct rtc_time tm;
	int tmp;
	unsigned long flags;

	rtc_time_to_tm(t, &tm);
	tm.tm_year += 1900;

	spin_lock_irqsave(&rtc_lock, flags);
	/* unlock writes to the CCR */
	xicor_write(X1241REG_SR, X1241REG_SR_WEL);
	xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL);

	/* trivial ones */
	tm.tm_sec = bin2bcd(tm.tm_sec);
	xicor_write(X1241REG_SC, tm.tm_sec);

	tm.tm_min = bin2bcd(tm.tm_min);
	xicor_write(X1241REG_MN, tm.tm_min);

	tm.tm_mday = bin2bcd(tm.tm_mday);
	xicor_write(X1241REG_DT, tm.tm_mday);

	/* tm_mon starts from 0, *ick* */
	tm.tm_mon ++;
	tm.tm_mon = bin2bcd(tm.tm_mon);
	xicor_write(X1241REG_MO, tm.tm_mon);

	/* year is split */
	tmp = tm.tm_year / 100;
	tm.tm_year %= 100;
	xicor_write(X1241REG_YR, tm.tm_year);
	xicor_write(X1241REG_Y2K, tmp);

	/* hour is the most tricky one */
	tmp = xicor_read(X1241REG_HR);
	if (tmp & X1241REG_HR_MIL) {
		/* 24 hour format */
		tm.tm_hour = bin2bcd(tm.tm_hour);
		tmp = (tmp & ~0x3f) | (tm.tm_hour & 0x3f);
	} else {
		/* 12 hour format, with 0x2 for pm */
		tmp = tmp & ~0x3f;
		if (tm.tm_hour >= 12) {
			tmp |= 0x20;
			tm.tm_hour -= 12;
		}
		tm.tm_hour = bin2bcd(tm.tm_hour);
		tmp |= tm.tm_hour;
	}
	xicor_write(X1241REG_HR, tmp);

	xicor_write(X1241REG_SR, 0);
	spin_unlock_irqrestore(&rtc_lock, flags);

	return 0;
}
unsigned long xicor_get_time(void)
{
	unsigned int year, mon, day, hour, min, sec, y2k;
	unsigned long flags;

	spin_lock_irqsave(&rtc_lock, flags);
	sec = xicor_read(X1241REG_SC);
	min = xicor_read(X1241REG_MN);
	hour = xicor_read(X1241REG_HR);

	if (hour & X1241REG_HR_MIL) {
		hour &= 0x3f;
	} else {
		if (hour & 0x20)
			hour = (hour & 0xf) + 0x12;
	}

	day = xicor_read(X1241REG_DT);
	mon = xicor_read(X1241REG_MO);
	year = xicor_read(X1241REG_YR);
	y2k = xicor_read(X1241REG_Y2K);
	spin_unlock_irqrestore(&rtc_lock, flags);

	sec = bcd2bin(sec);
	min = bcd2bin(min);
	hour = bcd2bin(hour);
	day = bcd2bin(day);
	mon = bcd2bin(mon);
	year = bcd2bin(year);
	y2k = bcd2bin(y2k);

	year += (y2k * 100);

	return mktime(year, mon, day, hour, min, sec);
}
Exemplo n.º 4
0
static unsigned long __init get_swarm_time(void)
{
	unsigned int year, mon, day, hour, min, sec, y2k;

	sec = xicor_read(X1241REG_SC);
	min = xicor_read(X1241REG_MN);
	hour = xicor_read(X1241REG_HR);

	if (hour & X1241REG_HR_MIL) {
		hour &= 0x3f;
	} else {
		if (hour & 0x20)
			hour = (hour & 0xf) + 0x12;
	}

	BCD_TO_BIN(sec);
	BCD_TO_BIN(min);
	BCD_TO_BIN(hour);

	day = xicor_read(X1241REG_DT);
	mon = xicor_read(X1241REG_MO);
	year = xicor_read(X1241REG_YR);
	y2k = xicor_read(X1241REG_Y2K);
 
	BCD_TO_BIN(day);
	BCD_TO_BIN(mon);
	BCD_TO_BIN(year);
	BCD_TO_BIN(y2k);

	year += (y2k * 100);

	return mktime(year, mon, day, hour, min, sec);
}
Exemplo n.º 5
0
/*
 * In order to set the CMOS clock precisely, set_rtc_mmss has to be
 * called 500 ms after the second nowtime has started, because when
 * nowtime is written into the registers of the CMOS clock, it will
 * jump to the next second precisely 500 ms later. Check the Motorola
 * MC146818A or Dallas DS12887 data sheet for details.
 *
 * BUG: This routine does not handle hour overflow properly; it just
 *      sets the minutes. Usually you'll only notice that after reboot!
 */
int set_rtc_mmss(unsigned long nowtime)
{
	int retval = 0;
	int real_seconds, real_minutes, cmos_minutes;

	cmos_minutes = xicor_read(X1241REG_MN);
	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;

	/* unlock writes to the CCR */
	xicor_write(X1241REG_SR, X1241REG_SR_WEL);
	xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL);

	if (abs(real_minutes - cmos_minutes) < 30) {
		BIN_TO_BCD(real_seconds);
		BIN_TO_BCD(real_minutes);
		xicor_write(X1241REG_SC, real_seconds);
		xicor_write(X1241REG_MN, real_minutes);
	} else {
		printk(KERN_WARNING
		       "set_rtc_mmss: can't update from %d to %d\n",
		       cmos_minutes, real_minutes);
		retval = -1;
	}

	xicor_write(X1241REG_SR, 0);

	printk("set_rtc_mmss: %02d:%02d\n", real_minutes, real_seconds);

	return retval;
}
int xicor_probe(void)
{
	return (xicor_read(X1241REG_SC) != -1);
}