[people/ms/u-boot.git] / drivers / rtc / isl1208.c

/*
 * (C) Copyright 2008
 * Tor Krill, Excito Elektronik i Skåne , tor@excito.com
 *
 * Modelled after the ds1337 driver
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * Date & Time support (no alarms) for Intersil
 * ISL1208 Real Time Clock (RTC).
 */

#include <common.h>
#include <command.h>
#include <rtc.h>
#include <i2c.h>

/*---------------------------------------------------------------------*/
#ifdef DEBUG_RTC
#define DEBUGR(fmt,args...) printf(fmt ,##args)
#else
#define DEBUGR(fmt,args...)
#endif
/*---------------------------------------------------------------------*/

/*
 * RTC register addresses
 */

#define RTC_SEC_REG_ADDR	0x0
#define RTC_MIN_REG_ADDR	0x1
#define RTC_HR_REG_ADDR		0x2
#define RTC_DATE_REG_ADDR	0x3
#define RTC_MON_REG_ADDR	0x4
#define RTC_YR_REG_ADDR		0x5
#define RTC_DAY_REG_ADDR	0x6
#define RTC_STAT_REG_ADDR	0x7
/*
 * RTC control register bits
 */

/*
 * RTC status register bits
 */
#define RTC_STAT_BIT_ARST	0x80	/* AUTO RESET ENABLE BIT */
#define RTC_STAT_BIT_XTOSCB	0x40	/* CRYSTAL OSCILLATOR ENABLE BIT */
#define RTC_STAT_BIT_WRTC	0x10	/* WRITE RTC ENABLE BIT */
#define RTC_STAT_BIT_ALM	0x04	/* ALARM BIT */
#define RTC_STAT_BIT_BAT	0x02	/* BATTERY BIT */
#define RTC_STAT_BIT_RTCF	0x01	/* REAL TIME CLOCK FAIL BIT */

static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);

/*
 * Get the current time from the RTC
 */

int rtc_get (struct rtc_time *tmp)
{
	int rel = 0;
	uchar sec, min, hour, mday, wday, mon, year, status;

	status = rtc_read (RTC_STAT_REG_ADDR);
	sec = rtc_read (RTC_SEC_REG_ADDR);
	min = rtc_read (RTC_MIN_REG_ADDR);
	hour = rtc_read (RTC_HR_REG_ADDR);
	wday = rtc_read (RTC_DAY_REG_ADDR);
	mday = rtc_read (RTC_DATE_REG_ADDR);
	mon = rtc_read (RTC_MON_REG_ADDR);
	year = rtc_read (RTC_YR_REG_ADDR);

	DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
		"hr: %02x min: %02x sec: %02x status: %02x\n",
		year, mon, mday, wday, hour, min, sec, status);

	if (status & RTC_STAT_BIT_RTCF) {
		printf ("### Warning: RTC oscillator has stopped\n");
		rtc_write(RTC_STAT_REG_ADDR,
			rtc_read(RTC_STAT_REG_ADDR) &~ (RTC_STAT_BIT_BAT|RTC_STAT_BIT_RTCF));
		rel = -1;
	}

	tmp->tm_sec  = bcd2bin (sec & 0x7F);
	tmp->tm_min  = bcd2bin (min & 0x7F);
	tmp->tm_hour = bcd2bin (hour & 0x3F);
	tmp->tm_mday = bcd2bin (mday & 0x3F);
	tmp->tm_mon  = bcd2bin (mon & 0x1F);
	tmp->tm_year = bcd2bin (year)+2000;
	tmp->tm_wday = bcd2bin (wday & 0x07);
	tmp->tm_yday = 0;
	tmp->tm_isdst= 0;

	DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);

	return rel;
}

/*
 * Set the RTC
 */
int rtc_set (struct rtc_time *tmp)
{
	DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);

	/* enable write */
	rtc_write(RTC_STAT_REG_ADDR,
		rtc_read(RTC_STAT_REG_ADDR) | RTC_STAT_BIT_WRTC);

	rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
	rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
	rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
	rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
	rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour) | 0x80 ); /* 24h clock */
	rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
	rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));

	/* disable write */
	rtc_write(RTC_STAT_REG_ADDR,
		rtc_read(RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_WRTC);

	return 0;
}

void rtc_reset (void)
{
}

/*
 * Helper functions
 */

static uchar rtc_read (uchar reg)
{
	return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
}

static void rtc_write (uchar reg, uchar val)
{
	i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
}
Commit	Line	Data
9536dfcc TK	1	/*
	2	* (C) Copyright 2008
	3	* Tor Krill, Excito Elektronik i Skåne , tor@excito.com
	4	*
	5	* Modelled after the ds1337 driver
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License as
	9	* published by the Free Software Foundation; either version 2 of
	10	* the License, or (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	20	* MA 02111-1307 USA
	21	*/
	22
	23	/*
	24	* Date & Time support (no alarms) for Intersil
	25	* ISL1208 Real Time Clock (RTC).
	26	*/
	27
	28	#include <common.h>
	29	#include <command.h>
	30	#include <rtc.h>
	31	#include <i2c.h>
	32
	33	/---------------------------------------------------------------------/
	34	#ifdef DEBUG_RTC
	35	#define DEBUGR(fmt,args...) printf(fmt ,##args)
	36	#else
	37	#define DEBUGR(fmt,args...)
	38	#endif
	39	/---------------------------------------------------------------------/
	40
	41	/*
	42	* RTC register addresses
	43	*/
	44
	45	#define RTC_SEC_REG_ADDR 0x0
	46	#define RTC_MIN_REG_ADDR 0x1
	47	#define RTC_HR_REG_ADDR 0x2
	48	#define RTC_DATE_REG_ADDR 0x3
	49	#define RTC_MON_REG_ADDR 0x4
	50	#define RTC_YR_REG_ADDR 0x5
	51	#define RTC_DAY_REG_ADDR 0x6
	52	#define RTC_STAT_REG_ADDR 0x7
	53	/*
	54	* RTC control register bits
	55	*/
	56
	57	/*
	58	* RTC status register bits
	59	*/
	60	#define RTC_STAT_BIT_ARST 0x80 /* AUTO RESET ENABLE BIT */
	61	#define RTC_STAT_BIT_XTOSCB 0x40 /* CRYSTAL OSCILLATOR ENABLE BIT */
	62	#define RTC_STAT_BIT_WRTC 0x10 /* WRITE RTC ENABLE BIT */
	63	#define RTC_STAT_BIT_ALM 0x04 /* ALARM BIT */
	64	#define RTC_STAT_BIT_BAT 0x02 /* BATTERY BIT */
65	#define RTC_STAT_BIT_RTCF 0x01 /* REAL TIME CLOCK FAIL BIT */
66
67	static uchar rtc_read (uchar reg);
68	static void rtc_write (uchar reg, uchar val);
9536dfcc TK	69
	70	/*
	71	* Get the current time from the RTC
	72	*/
	73
b73a19e1	74	int rtc_get (struct rtc_time *tmp)
9536dfcc	75	{
b73a19e1	76	int rel = 0;
9536dfcc TK	77	uchar sec, min, hour, mday, wday, mon, year, status;
	78
	79	status = rtc_read (RTC_STAT_REG_ADDR);
	80	sec = rtc_read (RTC_SEC_REG_ADDR);
	81	min = rtc_read (RTC_MIN_REG_ADDR);
	82	hour = rtc_read (RTC_HR_REG_ADDR);
	83	wday = rtc_read (RTC_DAY_REG_ADDR);
	84	mday = rtc_read (RTC_DATE_REG_ADDR);
	85	mon = rtc_read (RTC_MON_REG_ADDR);
	86	year = rtc_read (RTC_YR_REG_ADDR);
	87
	88	DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
	89	"hr: %02x min: %02x sec: %02x status: %02x\n",
	90	year, mon, mday, wday, hour, min, sec, status);
	91
	92	if (status & RTC_STAT_BIT_RTCF) {
	93	printf ("### Warning: RTC oscillator has stopped\n");
	94	rtc_write(RTC_STAT_REG_ADDR,
	95	rtc_read(RTC_STAT_REG_ADDR) &~ (RTC_STAT_BIT_BAT\|RTC_STAT_BIT_RTCF));
b73a19e1	96	rel = -1;
9536dfcc TK	97	}
	98
	99	tmp->tm_sec = bcd2bin (sec & 0x7F);
	100	tmp->tm_min = bcd2bin (min & 0x7F);
	101	tmp->tm_hour = bcd2bin (hour & 0x3F);
	102	tmp->tm_mday = bcd2bin (mday & 0x3F);
	103	tmp->tm_mon = bcd2bin (mon & 0x1F);
	104	tmp->tm_year = bcd2bin (year)+2000;
	105	tmp->tm_wday = bcd2bin (wday & 0x07);
	106	tmp->tm_yday = 0;
	107	tmp->tm_isdst= 0;
	108
	109	DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	110	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	111	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
b73a19e1 YT	112
b73a19e1 YT	113	return rel;
9536dfcc TK	114	}
	115
	116	/*
	117	* Set the RTC
	118	*/
d1e23194	119	int rtc_set (struct rtc_time *tmp)
9536dfcc TK	120	{
	121	DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	122	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	123	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	124
	125	/* enable write */
	126	rtc_write(RTC_STAT_REG_ADDR,
	127	rtc_read(RTC_STAT_REG_ADDR) \| RTC_STAT_BIT_WRTC);
	128
	129	rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
	130	rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
	131	rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
	132	rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
	133	rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour) \| 0x80 ); /* 24h clock */
	134	rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
	135	rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
	136
	137	/* disable write */
	138	rtc_write(RTC_STAT_REG_ADDR,
	139	rtc_read(RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_WRTC);
d1e23194 JCPV	140
d1e23194 JCPV	141	return 0;
9536dfcc TK	142	}
	143
	144	void rtc_reset (void)
	145	{
	146	}
	147
	148	/*
	149	* Helper functions
	150	*/
	151
	152	static uchar rtc_read (uchar reg)
	153	{
6d0f6bcf	154	return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
9536dfcc TK	155	}
	156
	157	static void rtc_write (uchar reg, uchar val)
	158	{
6d0f6bcf	159	i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
9536dfcc	160	}