[J-u-boot.git] / drivers / rtc / max6900.c

/*
 * (C) Copyright 2004
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Date & Time support for MAXIM MAX6900 RTC
 */

/* #define	DEBUG	*/

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

#if defined(CONFIG_CMD_DATE)

#ifndef	CONFIG_SYS_I2C_RTC_ADDR
#define	CONFIG_SYS_I2C_RTC_ADDR	0x50
#endif

/* ------------------------------------------------------------------------- */

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);
	udelay(2500);
}

/* ------------------------------------------------------------------------- */

int rtc_get (struct rtc_time *tmp)
{
	uchar sec, min, hour, mday, wday, mon, cent, year;
	int retry = 1;

	do {
		sec	= rtc_read (0x80);
		min	= rtc_read (0x82);
		hour	= rtc_read (0x84);
		mday	= rtc_read (0x86);
		mon	= rtc_read (0x88);
		wday	= rtc_read (0x8a);
		year	= rtc_read (0x8c);
		cent	= rtc_read (0x92);
		/*
		 * Check for seconds rollover
		 */
		if ((sec != 59) || (rtc_read(0x80) == sec)){
			retry = 0;
		}
	} while (retry);

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

	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) + bcd2bin(cent) * 100;
	tmp->tm_wday = bcd2bin (wday & 0x07);
	tmp->tm_yday = 0;
	tmp->tm_isdst= 0;

	debug ( "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 0;
}

int rtc_set (struct rtc_time *tmp)
{

	debug ( "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);

	rtc_write (0x9E, 0x00);
	rtc_write (0x80, 0);	/* Clear seconds to ensure no rollover */
	rtc_write (0x92, bin2bcd(tmp->tm_year / 100));
	rtc_write (0x8c, bin2bcd(tmp->tm_year % 100));
	rtc_write (0x8a, bin2bcd(tmp->tm_wday));
	rtc_write (0x88, bin2bcd(tmp->tm_mon));
	rtc_write (0x86, bin2bcd(tmp->tm_mday));
	rtc_write (0x84, bin2bcd(tmp->tm_hour));
	rtc_write (0x82, bin2bcd(tmp->tm_min ));
	rtc_write (0x80, bin2bcd(tmp->tm_sec ));

	return 0;
}

void rtc_reset (void)
{
}

#endif
Commit	Line	Data
4c0d4c3b WD	1	/*
	2	* (C) Copyright 2004
	3	* Wolfgang Denk, DENX Software Engineering, [email protected].
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
4c0d4c3b WD	6	*/
	7
	8	/*
	9	* Date & Time support for MAXIM MAX6900 RTC
	10	*/
	11
	12	/* #define DEBUG */
	13
	14	#include <common.h>
	15	#include <command.h>
	16	#include <rtc.h>
	17	#include <i2c.h>
	18
871c18dd	19	#if defined(CONFIG_CMD_DATE)
4c0d4c3b	20
6d0f6bcf JCPV	21	#ifndef CONFIG_SYS_I2C_RTC_ADDR
6d0f6bcf JCPV	22	#define CONFIG_SYS_I2C_RTC_ADDR 0x50
4c0d4c3b WD	23	#endif
	24
	25	/* ------------------------------------------------------------------------- */
	26
	27	static uchar rtc_read (uchar reg)
	28	{
6d0f6bcf	29	return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
4c0d4c3b WD	30	}
	31
	32	static void rtc_write (uchar reg, uchar val)
	33	{
6d0f6bcf	34	i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
4c0d4c3b WD	35	udelay(2500);
	36	}
	37
4c0d4c3b WD	38	/* ------------------------------------------------------------------------- */
4c0d4c3b WD	39
b73a19e1	40	int rtc_get (struct rtc_time *tmp)
4c0d4c3b WD	41	{
	42	uchar sec, min, hour, mday, wday, mon, cent, year;
	43	int retry = 1;
	44
	45	do {
	46	sec = rtc_read (0x80);
	47	min = rtc_read (0x82);
	48	hour = rtc_read (0x84);
	49	mday = rtc_read (0x86);
	50	mon = rtc_read (0x88);
	51	wday = rtc_read (0x8a);
	52	year = rtc_read (0x8c);
	53	cent = rtc_read (0x92);
	54	/*
	55	* Check for seconds rollover
	56	*/
	57	if ((sec != 59) \|\| (rtc_read(0x80) == sec)){
	58	retry = 0;
	59	}
	60	} while (retry);
	61
	62	debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x "
	63	"hr: %02x min: %02x sec: %02x\n",
	64	year, mon, cent, mday, wday,
	65	hour, min, sec );
	66
	67	tmp->tm_sec = bcd2bin (sec & 0x7F);
	68	tmp->tm_min = bcd2bin (min & 0x7F);
	69	tmp->tm_hour = bcd2bin (hour & 0x3F);
	70	tmp->tm_mday = bcd2bin (mday & 0x3F);
	71	tmp->tm_mon = bcd2bin (mon & 0x1F);
	72	tmp->tm_year = bcd2bin (year) + bcd2bin(cent) * 100;
	73	tmp->tm_wday = bcd2bin (wday & 0x07);
	74	tmp->tm_yday = 0;
	75	tmp->tm_isdst= 0;
	76
	77	debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	78	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	79	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
b73a19e1 YT	80
b73a19e1 YT	81	return 0;
4c0d4c3b WD	82	}
4c0d4c3b WD	83
d1e23194	84	int rtc_set (struct rtc_time *tmp)
4c0d4c3b WD	85	{
	86
	87	debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	88	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	89	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	90
	91	rtc_write (0x9E, 0x00);
	92	rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */
	93	rtc_write (0x92, bin2bcd(tmp->tm_year / 100));
	94	rtc_write (0x8c, bin2bcd(tmp->tm_year % 100));
	95	rtc_write (0x8a, bin2bcd(tmp->tm_wday));
	96	rtc_write (0x88, bin2bcd(tmp->tm_mon));
	97	rtc_write (0x86, bin2bcd(tmp->tm_mday));
	98	rtc_write (0x84, bin2bcd(tmp->tm_hour));
	99	rtc_write (0x82, bin2bcd(tmp->tm_min ));
	100	rtc_write (0x80, bin2bcd(tmp->tm_sec ));
d1e23194 JCPV	101
d1e23194 JCPV	102	return 0;
4c0d4c3b WD	103	}
	104
	105	void rtc_reset (void)
	106	{
	107	}
	108
068b60a0	109	#endif