[J-u-boot.git] / drivers / rtc / m41t62.c

/*
 * (C) Copyright 2008
 * Stefan Roese, DENX Software Engineering, [email protected].
 *
 * based on a the Linux rtc-m41t80.c driver which is:
 *   Alexander Bigga <[email protected]>, 2006 (c) mycable GmbH
 *
 * 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 for STMicroelectronics M41T62
 */

/* #define	DEBUG	*/

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

#if defined(CONFIG_CMD_DATE)

#define M41T62_REG_SSEC	0
#define M41T62_REG_SEC	1
#define M41T62_REG_MIN	2
#define M41T62_REG_HOUR	3
#define M41T62_REG_WDAY	4
#define M41T62_REG_DAY	5
#define M41T62_REG_MON	6
#define M41T62_REG_YEAR	7
#define M41T62_REG_ALARM_MON	0xa
#define M41T62_REG_ALARM_DAY	0xb
#define M41T62_REG_ALARM_HOUR	0xc
#define M41T62_REG_ALARM_MIN	0xd
#define M41T62_REG_ALARM_SEC	0xe
#define M41T62_REG_FLAGS	0xf

#define M41T62_DATETIME_REG_SIZE	(M41T62_REG_YEAR + 1)
#define M41T62_ALARM_REG_SIZE	\
	(M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON)

#define M41T62_SEC_ST		(1 << 7)	/* ST: Stop Bit */
#define M41T62_ALMON_AFE	(1 << 7)	/* AFE: AF Enable Bit */
#define M41T62_ALMON_SQWE	(1 << 6)	/* SQWE: SQW Enable Bit */
#define M41T62_ALHOUR_HT	(1 << 6)	/* HT: Halt Update Bit */
#define M41T62_FLAGS_AF		(1 << 6)	/* AF: Alarm Flag Bit */
#define M41T62_FLAGS_BATT_LOW	(1 << 4)	/* BL: Battery Low Bit */

#define M41T62_FEATURE_HT	(1 << 0)
#define M41T62_FEATURE_BL	(1 << 1)

int rtc_get(struct rtc_time *tm)
{
	u8 buf[M41T62_DATETIME_REG_SIZE];

	i2c_read(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);

	debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
	      "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
	      __FUNCTION__,
	      buf[0], buf[1], buf[2], buf[3],
	      buf[4], buf[5], buf[6], buf[7]);

	tm->tm_sec = BCD2BIN(buf[M41T62_REG_SEC] & 0x7f);
	tm->tm_min = BCD2BIN(buf[M41T62_REG_MIN] & 0x7f);
	tm->tm_hour = BCD2BIN(buf[M41T62_REG_HOUR] & 0x3f);
	tm->tm_mday = BCD2BIN(buf[M41T62_REG_DAY] & 0x3f);
	tm->tm_wday = buf[M41T62_REG_WDAY] & 0x07;
	tm->tm_mon = BCD2BIN(buf[M41T62_REG_MON] & 0x1f);

	/* assume 20YY not 19YY, and ignore the Century Bit */
	/* U-Boot needs to add 1900 here */
	tm->tm_year = BCD2BIN(buf[M41T62_REG_YEAR]) + 100 + 1900;

	debug("%s: tm is secs=%d, mins=%d, hours=%d, "
	      "mday=%d, mon=%d, year=%d, wday=%d\n",
	      __FUNCTION__,
	      tm->tm_sec, tm->tm_min, tm->tm_hour,
	      tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

	return 0;
}

int rtc_set(struct rtc_time *tm)
{
	u8 buf[M41T62_DATETIME_REG_SIZE];

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

	i2c_read(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);

	/* Merge time-data and register flags into buf[0..7] */
	buf[M41T62_REG_SSEC] = 0;
	buf[M41T62_REG_SEC] =
		BIN2BCD(tm->tm_sec) | (buf[M41T62_REG_SEC] & ~0x7f);
	buf[M41T62_REG_MIN] =
		BIN2BCD(tm->tm_min) | (buf[M41T62_REG_MIN] & ~0x7f);
	buf[M41T62_REG_HOUR] =
		BIN2BCD(tm->tm_hour) | (buf[M41T62_REG_HOUR] & ~0x3f) ;
	buf[M41T62_REG_WDAY] =
		(tm->tm_wday & 0x07) | (buf[M41T62_REG_WDAY] & ~0x07);
	buf[M41T62_REG_DAY] =
		BIN2BCD(tm->tm_mday) | (buf[M41T62_REG_DAY] & ~0x3f);
	buf[M41T62_REG_MON] =
		BIN2BCD(tm->tm_mon) | (buf[M41T62_REG_MON] & ~0x1f);
	/* assume 20YY not 19YY */
	buf[M41T62_REG_YEAR] = BIN2BCD(tm->tm_year % 100);

	if (i2c_write(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) {
		printf("I2C write failed in %s()\n", __func__);
		return -1;
	}

	return 0;
}

void rtc_reset(void)
{
	/*
	 * Nothing to do
	 */
}

#endif
Commit	Line	Data
88aff62d SR	1	/*
	2	* (C) Copyright 2008
	3	* Stefan Roese, DENX Software Engineering, [email protected].
	4	*
	5	* based on a the Linux rtc-m41t80.c driver which is:
	6	* Alexander Bigga <[email protected]>, 2006 (c) mycable GmbH
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
	24	/*
	25	* Date & Time support for STMicroelectronics M41T62
	26	*/
	27
	28	/* #define DEBUG */
	29
	30	#include <common.h>
	31	#include <command.h>
	32	#include <rtc.h>
	33	#include <i2c.h>
	34	#include <bcd.h>
	35
	36	#if defined(CONFIG_CMD_DATE)
	37
	38	#define M41T62_REG_SSEC 0
	39	#define M41T62_REG_SEC 1
	40	#define M41T62_REG_MIN 2
	41	#define M41T62_REG_HOUR 3
	42	#define M41T62_REG_WDAY 4
	43	#define M41T62_REG_DAY 5
	44	#define M41T62_REG_MON 6
	45	#define M41T62_REG_YEAR 7
	46	#define M41T62_REG_ALARM_MON 0xa
	47	#define M41T62_REG_ALARM_DAY 0xb
	48	#define M41T62_REG_ALARM_HOUR 0xc
	49	#define M41T62_REG_ALARM_MIN 0xd
	50	#define M41T62_REG_ALARM_SEC 0xe
	51	#define M41T62_REG_FLAGS 0xf
	52
	53	#define M41T62_DATETIME_REG_SIZE (M41T62_REG_YEAR + 1)
	54	#define M41T62_ALARM_REG_SIZE \
	55	(M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON)
	56
	57	#define M41T62_SEC_ST (1 << 7) /* ST: Stop Bit */
	58	#define M41T62_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */
	59	#define M41T62_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */
	60	#define M41T62_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */
	61	#define M41T62_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */
	62	#define M41T62_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */
	63
	64	#define M41T62_FEATURE_HT (1 << 0)
65	#define M41T62_FEATURE_BL (1 << 1)
66
b73a19e1	67	int rtc_get(struct rtc_time *tm)
88aff62d SR	68	{
	69	u8 buf[M41T62_DATETIME_REG_SIZE];
	70
	71	i2c_read(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
	72
	73	debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
	74	"mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
	75	__FUNCTION__,
	76	buf[0], buf[1], buf[2], buf[3],
	77	buf[4], buf[5], buf[6], buf[7]);
	78
	79	tm->tm_sec = BCD2BIN(buf[M41T62_REG_SEC] & 0x7f);
	80	tm->tm_min = BCD2BIN(buf[M41T62_REG_MIN] & 0x7f);
	81	tm->tm_hour = BCD2BIN(buf[M41T62_REG_HOUR] & 0x3f);
	82	tm->tm_mday = BCD2BIN(buf[M41T62_REG_DAY] & 0x3f);
	83	tm->tm_wday = buf[M41T62_REG_WDAY] & 0x07;
0072b78b	84	tm->tm_mon = BCD2BIN(buf[M41T62_REG_MON] & 0x1f);
88aff62d SR	85
	86	/* assume 20YY not 19YY, and ignore the Century Bit */
	87	/* U-Boot needs to add 1900 here */
	88	tm->tm_year = BCD2BIN(buf[M41T62_REG_YEAR]) + 100 + 1900;
	89
	90	debug("%s: tm is secs=%d, mins=%d, hours=%d, "
	91	"mday=%d, mon=%d, year=%d, wday=%d\n",
	92	__FUNCTION__,
	93	tm->tm_sec, tm->tm_min, tm->tm_hour,
	94	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
b73a19e1 YT	95
b73a19e1 YT	96	return 0;
88aff62d SR	97	}
88aff62d SR	98
d1e23194	99	int rtc_set(struct rtc_time *tm)
88aff62d SR	100	{
	101	u8 buf[M41T62_DATETIME_REG_SIZE];
	102
	103	debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	104	tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
	105	tm->tm_hour, tm->tm_min, tm->tm_sec);
	106
	107	i2c_read(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
	108
	109	/* Merge time-data and register flags into buf[0..7] */
	110	buf[M41T62_REG_SSEC] = 0;
	111	buf[M41T62_REG_SEC] =
	112	BIN2BCD(tm->tm_sec) \| (buf[M41T62_REG_SEC] & ~0x7f);
	113	buf[M41T62_REG_MIN] =
	114	BIN2BCD(tm->tm_min) \| (buf[M41T62_REG_MIN] & ~0x7f);
	115	buf[M41T62_REG_HOUR] =
	116	BIN2BCD(tm->tm_hour) \| (buf[M41T62_REG_HOUR] & ~0x3f) ;
	117	buf[M41T62_REG_WDAY] =
	118	(tm->tm_wday & 0x07) \| (buf[M41T62_REG_WDAY] & ~0x07);
	119	buf[M41T62_REG_DAY] =
	120	BIN2BCD(tm->tm_mday) \| (buf[M41T62_REG_DAY] & ~0x3f);
	121	buf[M41T62_REG_MON] =
0072b78b	122	BIN2BCD(tm->tm_mon) \| (buf[M41T62_REG_MON] & ~0x1f);
88aff62d SR	123	/* assume 20YY not 19YY */
	124	buf[M41T62_REG_YEAR] = BIN2BCD(tm->tm_year % 100);
	125
d1e23194	126	if (i2c_write(CFG_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) {
88aff62d	127	printf("I2C write failed in %s()\n", __func__);
d1e23194 JCPV	128	return -1;
	129	}
	130
	131	return 0;
88aff62d SR	132	}
	133
	134	void rtc_reset(void)
	135	{
	136	/*
	137	* Nothing to do
	138	*/
	139	}
	140
	141	#endif