[people/ms/u-boot.git] / drivers / rtc / pcf8563.c

/*
 * (C) Copyright 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Date & Time support for Philips PCF8563 RTC
 */

/* #define	DEBUG	*/

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

#if defined(CONFIG_CMD_DATE)

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

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

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

	sec	= rtc_read (0x02);
	min	= rtc_read (0x03);
	hour	= rtc_read (0x04);
	mday	= rtc_read (0x05);
	wday	= rtc_read (0x06);
	mon_cent= rtc_read (0x07);
	year	= rtc_read (0x08);

	debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
		"hr: %02x min: %02x sec: %02x\n",
		year, mon_cent, mday, wday,
		hour, min, sec );
	debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
		rtc_read (0x0C),
		rtc_read (0x0B),
		rtc_read (0x0A),
		rtc_read (0x09) );

	if (sec & 0x80) {
		puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
		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_cent & 0x1F);
	tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
	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 rel;
}

int rtc_set (struct rtc_time *tmp)
{
	uchar century;

	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 (0x08, bin2bcd(tmp->tm_year % 100));

	century = (tmp->tm_year >= 2000) ? 0 : 0x80;
	rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);

	rtc_write (0x06, bin2bcd(tmp->tm_wday));
	rtc_write (0x05, bin2bcd(tmp->tm_mday));
	rtc_write (0x04, bin2bcd(tmp->tm_hour));
	rtc_write (0x03, bin2bcd(tmp->tm_min ));
	rtc_write (0x02, bin2bcd(tmp->tm_sec ));

	return 0;
}

void rtc_reset (void)
{
	/* clear all control & status registers */
	rtc_write (0x00, 0x00);
	rtc_write (0x01, 0x00);
	rtc_write (0x0D, 0x00);

	/* clear Voltage Low bit */
	rtc_write (0x02, rtc_read (0x02) & 0x7F);

	/* reset all alarms */
	rtc_write (0x09, 0x00);
	rtc_write (0x0A, 0x00);
	rtc_write (0x0B, 0x00);
	rtc_write (0x0C, 0x00);
}

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

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);
}

#endif
Commit	Line	Data
fe8c2806 WD	1	/*
	2	* (C) Copyright 2001
	3	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
fe8c2806 WD	6	*/
	7
	8	/*
	9	* Date & Time support for Philips PCF8563 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)
fe8c2806 WD	20
	21	static uchar rtc_read (uchar reg);
	22	static void rtc_write (uchar reg, uchar val);
fe8c2806 WD	23
	24	/* ------------------------------------------------------------------------- */
	25
b73a19e1	26	int rtc_get (struct rtc_time *tmp)
fe8c2806	27	{
b73a19e1	28	int rel = 0;
fe8c2806 WD	29	uchar sec, min, hour, mday, wday, mon_cent, year;
	30
	31	sec = rtc_read (0x02);
	32	min = rtc_read (0x03);
	33	hour = rtc_read (0x04);
	34	mday = rtc_read (0x05);
	35	wday = rtc_read (0x06);
	36	mon_cent= rtc_read (0x07);
	37	year = rtc_read (0x08);
	38
	39	debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
	40	"hr: %02x min: %02x sec: %02x\n",
	41	year, mon_cent, mday, wday,
	42	hour, min, sec );
	43	debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
	44	rtc_read (0x0C),
	45	rtc_read (0x0B),
	46	rtc_read (0x0A),
	47	rtc_read (0x09) );
	48
	49	if (sec & 0x80) {
4b9206ed	50	puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
b73a19e1	51	rel = -1;
fe8c2806 WD	52	}
	53
	54	tmp->tm_sec = bcd2bin (sec & 0x7F);
	55	tmp->tm_min = bcd2bin (min & 0x7F);
	56	tmp->tm_hour = bcd2bin (hour & 0x3F);
	57	tmp->tm_mday = bcd2bin (mday & 0x3F);
	58	tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
df930e9b	59	tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
fe8c2806 WD	60	tmp->tm_wday = bcd2bin (wday & 0x07);
	61	tmp->tm_yday = 0;
	62	tmp->tm_isdst= 0;
	63
	64	debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	65	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	66	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
b73a19e1 YT	67
b73a19e1 YT	68	return rel;
fe8c2806 WD	69	}
fe8c2806 WD	70
d1e23194	71	int rtc_set (struct rtc_time *tmp)
fe8c2806 WD	72	{
	73	uchar century;
	74
	75	debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	76	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	77	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	78
	79	rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
	80
df930e9b	81	century = (tmp->tm_year >= 2000) ? 0 : 0x80;
fe8c2806 WD	82	rtc_write (0x07, bin2bcd(tmp->tm_mon) \| century);
	83
	84	rtc_write (0x06, bin2bcd(tmp->tm_wday));
	85	rtc_write (0x05, bin2bcd(tmp->tm_mday));
	86	rtc_write (0x04, bin2bcd(tmp->tm_hour));
	87	rtc_write (0x03, bin2bcd(tmp->tm_min ));
	88	rtc_write (0x02, bin2bcd(tmp->tm_sec ));
d1e23194 JCPV	89
d1e23194 JCPV	90	return 0;
fe8c2806 WD	91	}
	92
	93	void rtc_reset (void)
	94	{
	95	/* clear all control & status registers */
	96	rtc_write (0x00, 0x00);
	97	rtc_write (0x01, 0x00);
	98	rtc_write (0x0D, 0x00);
	99
	100	/* clear Voltage Low bit */
	101	rtc_write (0x02, rtc_read (0x02) & 0x7F);
	102
	103	/* reset all alarms */
	104	rtc_write (0x09, 0x00);
	105	rtc_write (0x0A, 0x00);
	106	rtc_write (0x0B, 0x00);
	107	rtc_write (0x0C, 0x00);
	108	}
	109
	110	/* ------------------------------------------------------------------------- */
	111
	112	static uchar rtc_read (uchar reg)
	113	{
6d0f6bcf	114	return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
fe8c2806 WD	115	}
	116
	117	static void rtc_write (uchar reg, uchar val)
	118	{
6d0f6bcf	119	i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
fe8c2806 WD	120	}
fe8c2806 WD	121
068b60a0	122	#endif