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

/*
 * (C) Copyright 2001
 * Denis Peter MPL AG Switzerland. d.peter@mpl.ch
 *
 * 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>

#ifdef __I386__
#include <asm/io.h>
#define in8(p) inb(p)
#define out8(p, v) outb(v, p)
#endif

#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. d.peter@mpl.ch
	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
21831001 GR	34	#ifdef __I386__
	35	#include <asm/io.h>
	36	#define in8(p) inb(p)
	37	#define out8(p, v) outb(v, p)
	38	#endif
	39
871c18dd	40	#if defined(CONFIG_CMD_DATE)
affae2bf WD	41
	42	static uchar rtc_read (uchar reg);
	43	static void rtc_write (uchar reg, uchar val);
affae2bf	44
6d0f6bcf	45	#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
53677ef1 WD	46	#define RTC_SECONDS 0x00
	47	#define RTC_SECONDS_ALARM 0x01
	48	#define RTC_MINUTES 0x02
	49	#define RTC_MINUTES_ALARM 0x03
	50	#define RTC_HOURS 0x04
	51	#define RTC_HOURS_ALARM 0x05
	52	#define RTC_DAY_OF_WEEK 0x06
	53	#define RTC_DATE_OF_MONTH 0x07
	54	#define RTC_MONTH 0x08
	55	#define RTC_YEAR 0x09
	56	#define RTC_CONFIG_A 0x0A
	57	#define RTC_CONFIG_B 0x0B
	58	#define RTC_CONFIG_C 0x0C
	59	#define RTC_CONFIG_D 0x0D
affae2bf WD	60
	61
	62	/* ------------------------------------------------------------------------- */
	63
b73a19e1	64	int rtc_get (struct rtc_time *tmp)
affae2bf WD	65	{
	66	uchar sec, min, hour, mday, wday, mon, year;
	67	/* here check if rtc can be accessed */
	68	while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
53677ef1 WD	69	sec = rtc_read (RTC_SECONDS);
53677ef1 WD	70	min = rtc_read (RTC_MINUTES);
affae2bf WD	71	hour = rtc_read (RTC_HOURS);
	72	mday = rtc_read (RTC_DATE_OF_MONTH);
	73	wday = rtc_read (RTC_DAY_OF_WEEK);
53677ef1	74	mon = rtc_read (RTC_MONTH);
affae2bf WD	75	year = rtc_read (RTC_YEAR);
	76	#ifdef RTC_DEBUG
	77	printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
	78	"hr: %02x min: %02x sec: %02x\n",
c7de829c	79	year, mon, mday, wday,
affae2bf WD	80	hour, min, sec );
	81	printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
	82	rtc_read (RTC_CONFIG_D) & 0x3F,
	83	rtc_read (RTC_HOURS_ALARM),
	84	rtc_read (RTC_MINUTES_ALARM),
	85	rtc_read (RTC_SECONDS_ALARM) );
	86	#endif
	87	tmp->tm_sec = bcd2bin (sec & 0x7F);
	88	tmp->tm_min = bcd2bin (min & 0x7F);
	89	tmp->tm_hour = bcd2bin (hour & 0x3F);
	90	tmp->tm_mday = bcd2bin (mday & 0x3F);
	91	tmp->tm_mon = bcd2bin (mon & 0x1F);
	92	tmp->tm_year = bcd2bin (year);
	93	tmp->tm_wday = bcd2bin (wday & 0x07);
	94	if(tmp->tm_year<70)
	95	tmp->tm_year+=2000;
	96	else
	97	tmp->tm_year+=1900;
	98	tmp->tm_yday = 0;
	99	tmp->tm_isdst= 0;
	100	#ifdef RTC_DEBUG
	101	printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	102	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	103	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	104	#endif
b73a19e1 YT	105
b73a19e1 YT	106	return 0;
affae2bf WD	107	}
affae2bf WD	108
d1e23194	109	int rtc_set (struct rtc_time *tmp)
affae2bf WD	110	{
	111	#ifdef RTC_DEBUG
	112	printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	113	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	114	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	115	#endif
	116	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	117
	118	rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
	119	rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
affae2bf WD	120	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
	121	rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
	122	rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
	123	rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
	124	rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
	125	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
	126
d1e23194	127	return 0;
affae2bf WD	128	}
	129
	130	void rtc_reset (void)
	131	{
	132	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	133	rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
	134	rtc_write(RTC_CONFIG_B,0x00);
	135	rtc_write(RTC_CONFIG_B,0x00);
	136	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
	137	}
	138
	139	/* ------------------------------------------------------------------------- */
	140
6d0f6bcf	141	#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
affae2bf WD	142	/*
	143	* use direct memory access
	144	*/
	145	static uchar rtc_read (uchar reg)
	146	{
6d0f6bcf	147	return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg));
affae2bf WD	148	}
	149
	150	static void rtc_write (uchar reg, uchar val)
	151	{
6d0f6bcf	152	out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val);
affae2bf WD	153	}
	154	#else
	155	static uchar rtc_read (uchar reg)
	156	{
	157	out8(RTC_PORT_MC146818,reg);
	158	return(in8(RTC_PORT_MC146818+1));
	159	}
	160
	161	static void rtc_write (uchar reg, uchar val)
	162	{
	163	out8(RTC_PORT_MC146818,reg);
	164	out8(RTC_PORT_MC146818+1,val);
	165	}
	166	#endif
	167
068b60a0	168	#endif