[u-boot.git] / drivers / rtc / mc146818.c

/*
 * (C) Copyright 2001
 * Denis Peter MPL AG Switzerland. [email protected]
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 the MC146818 (PIXX4) RTC
 */

/*#define	DEBUG*/

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

#if defined(CONFIG_CMD_DATE)

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

#define RTC_PORT_MC146818	CONFIG_SYS_ISA_IO_BASE_ADDRESS +  0x70
#define RTC_SECONDS		0x00
#define RTC_SECONDS_ALARM	0x01
#define RTC_MINUTES		0x02
#define RTC_MINUTES_ALARM	0x03
#define RTC_HOURS		0x04
#define RTC_HOURS_ALARM		0x05
#define RTC_DAY_OF_WEEK		0x06
#define RTC_DATE_OF_MONTH	0x07
#define RTC_MONTH		0x08
#define RTC_YEAR		0x09
#define RTC_CONFIG_A		0x0A
#define RTC_CONFIG_B		0x0B
#define RTC_CONFIG_C		0x0C
#define RTC_CONFIG_D		0x0D


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

int rtc_get (struct rtc_time *tmp)
{
	uchar sec, min, hour, mday, wday, mon, year;
  /* here check if rtc can be accessed */
	while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
	sec	= rtc_read (RTC_SECONDS);
	min	= rtc_read (RTC_MINUTES);
	hour	= rtc_read (RTC_HOURS);
	mday	= rtc_read (RTC_DATE_OF_MONTH);
	wday	= rtc_read (RTC_DAY_OF_WEEK);
	mon	= rtc_read (RTC_MONTH);
	year	= rtc_read (RTC_YEAR);
#ifdef RTC_DEBUG
	printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
		"hr: %02x min: %02x sec: %02x\n",
		year, mon, mday, wday,
		hour, min, sec );
	printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
		rtc_read (RTC_CONFIG_D) & 0x3F,
		rtc_read (RTC_HOURS_ALARM),
		rtc_read (RTC_MINUTES_ALARM),
		rtc_read (RTC_SECONDS_ALARM) );
#endif
	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);
	tmp->tm_wday = bcd2bin (wday & 0x07);
	if(tmp->tm_year<70)
		tmp->tm_year+=2000;
	else
		tmp->tm_year+=1900;
	tmp->tm_yday = 0;
	tmp->tm_isdst= 0;
#ifdef RTC_DEBUG
	printf ( "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);
#endif

	return 0;
}

int rtc_set (struct rtc_time *tmp)
{
#ifdef RTC_DEBUG
	printf ( "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);
#endif
	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */

	rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
	rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
	rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
	rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
	rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
	rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */

	return 0;
}

void rtc_reset (void)
{
	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
	rtc_write(RTC_CONFIG_B,0x00);
	rtc_write(RTC_CONFIG_B,0x00);
	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
}

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

#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
/*
 * use direct memory access
 */
static uchar rtc_read (uchar reg)
{
	return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg));
}

static void rtc_write (uchar reg, uchar val)
{
	out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val);
}
#else
static uchar rtc_read (uchar reg)
{
	out8(RTC_PORT_MC146818,reg);
	return(in8(RTC_PORT_MC146818+1));
}

static void rtc_write (uchar reg, uchar val)
{
	out8(RTC_PORT_MC146818,reg);
	out8(RTC_PORT_MC146818+1,val);
}
#endif

#endif
Commit	Line	Data
affae2bf WD	1	/*
	2	* (C) Copyright 2001
	3	* Denis Peter MPL AG Switzerland. [email protected]
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	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 the MC146818 (PIXX4) RTC
	26	*/
	27
	28	/#define DEBUG/
	29
	30	#include <common.h>
	31	#include <command.h>
	32	#include <rtc.h>
	33
871c18dd	34	#if defined(CONFIG_CMD_DATE)
affae2bf WD	35
	36	static uchar rtc_read (uchar reg);
	37	static void rtc_write (uchar reg, uchar val);
affae2bf	38
6d0f6bcf	39	#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
53677ef1 WD	40	#define RTC_SECONDS 0x00
	41	#define RTC_SECONDS_ALARM 0x01
	42	#define RTC_MINUTES 0x02
	43	#define RTC_MINUTES_ALARM 0x03
	44	#define RTC_HOURS 0x04
	45	#define RTC_HOURS_ALARM 0x05
	46	#define RTC_DAY_OF_WEEK 0x06
	47	#define RTC_DATE_OF_MONTH 0x07
	48	#define RTC_MONTH 0x08
	49	#define RTC_YEAR 0x09
	50	#define RTC_CONFIG_A 0x0A
	51	#define RTC_CONFIG_B 0x0B
	52	#define RTC_CONFIG_C 0x0C
	53	#define RTC_CONFIG_D 0x0D
affae2bf WD	54
	55
	56	/* ------------------------------------------------------------------------- */
	57
b73a19e1	58	int rtc_get (struct rtc_time *tmp)
affae2bf WD	59	{
	60	uchar sec, min, hour, mday, wday, mon, year;
	61	/* here check if rtc can be accessed */
	62	while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
53677ef1 WD	63	sec = rtc_read (RTC_SECONDS);
53677ef1 WD	64	min = rtc_read (RTC_MINUTES);
affae2bf WD	65	hour = rtc_read (RTC_HOURS);
	66	mday = rtc_read (RTC_DATE_OF_MONTH);
	67	wday = rtc_read (RTC_DAY_OF_WEEK);
53677ef1	68	mon = rtc_read (RTC_MONTH);
affae2bf WD	69	year = rtc_read (RTC_YEAR);
	70	#ifdef RTC_DEBUG
	71	printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
	72	"hr: %02x min: %02x sec: %02x\n",
c7de829c	73	year, mon, mday, wday,
affae2bf WD	74	hour, min, sec );
	75	printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
	76	rtc_read (RTC_CONFIG_D) & 0x3F,
	77	rtc_read (RTC_HOURS_ALARM),
	78	rtc_read (RTC_MINUTES_ALARM),
	79	rtc_read (RTC_SECONDS_ALARM) );
	80	#endif
	81	tmp->tm_sec = bcd2bin (sec & 0x7F);
	82	tmp->tm_min = bcd2bin (min & 0x7F);
	83	tmp->tm_hour = bcd2bin (hour & 0x3F);
	84	tmp->tm_mday = bcd2bin (mday & 0x3F);
	85	tmp->tm_mon = bcd2bin (mon & 0x1F);
	86	tmp->tm_year = bcd2bin (year);
	87	tmp->tm_wday = bcd2bin (wday & 0x07);
	88	if(tmp->tm_year<70)
	89	tmp->tm_year+=2000;
	90	else
	91	tmp->tm_year+=1900;
	92	tmp->tm_yday = 0;
	93	tmp->tm_isdst= 0;
	94	#ifdef RTC_DEBUG
	95	printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	96	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	97	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	98	#endif
b73a19e1 YT	99
b73a19e1 YT	100	return 0;
affae2bf WD	101	}
affae2bf WD	102
d1e23194	103	int rtc_set (struct rtc_time *tmp)
affae2bf WD	104	{
	105	#ifdef RTC_DEBUG
	106	printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	107	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	108	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	109	#endif
	110	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	111
	112	rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
	113	rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
affae2bf WD	114	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
	115	rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
	116	rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
	117	rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
	118	rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
	119	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
	120
d1e23194	121	return 0;
affae2bf WD	122	}
	123
	124	void rtc_reset (void)
	125	{
	126	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	127	rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
	128	rtc_write(RTC_CONFIG_B,0x00);
	129	rtc_write(RTC_CONFIG_B,0x00);
	130	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
	131	}
	132
	133	/* ------------------------------------------------------------------------- */
	134
6d0f6bcf	135	#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
affae2bf WD	136	/*
	137	* use direct memory access
	138	*/
	139	static uchar rtc_read (uchar reg)
	140	{
6d0f6bcf	141	return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg));
affae2bf WD	142	}
	143
	144	static void rtc_write (uchar reg, uchar val)
	145	{
6d0f6bcf	146	out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val);
affae2bf WD	147	}
	148	#else
	149	static uchar rtc_read (uchar reg)
	150	{
	151	out8(RTC_PORT_MC146818,reg);
	152	return(in8(RTC_PORT_MC146818+1));
	153	}
	154
	155	static void rtc_write (uchar reg, uchar val)
	156	{
	157	out8(RTC_PORT_MC146818,reg);
	158	out8(RTC_PORT_MC146818+1,val);
	159	}
	160	#endif
	161
068b60a0	162	#endif