[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>

#if defined(CONFIG_CMD_DATE)

static uchar rtc_read  (uchar reg);
static void  rtc_write (uchar reg, uchar val);
static uchar bin2bcd   (unsigned int n);
static unsigned bcd2bin(uchar c);

#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 CONFIG_AMIGAONEG3SE
	wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */
#endif
#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));
#ifdef CONFIG_AMIGAONEG3SE
	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1);
#else
	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
#endif
	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

static unsigned bcd2bin (uchar n)
{
	return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
}

static unsigned char bin2bcd (unsigned int n)
{
	return (((n / 10) << 4) | (n % 10));
}

#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
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);
	38	static uchar bin2bcd (unsigned int n);
	39	static unsigned bcd2bin(uchar c);
	40
6d0f6bcf	41	#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
53677ef1 WD	42	#define RTC_SECONDS 0x00
	43	#define RTC_SECONDS_ALARM 0x01
	44	#define RTC_MINUTES 0x02
	45	#define RTC_MINUTES_ALARM 0x03
	46	#define RTC_HOURS 0x04
	47	#define RTC_HOURS_ALARM 0x05
	48	#define RTC_DAY_OF_WEEK 0x06
	49	#define RTC_DATE_OF_MONTH 0x07
	50	#define RTC_MONTH 0x08
	51	#define RTC_YEAR 0x09
	52	#define RTC_CONFIG_A 0x0A
	53	#define RTC_CONFIG_B 0x0B
	54	#define RTC_CONFIG_C 0x0C
	55	#define RTC_CONFIG_D 0x0D
affae2bf WD	56
	57
	58	/* ------------------------------------------------------------------------- */
	59
b73a19e1	60	int rtc_get (struct rtc_time *tmp)
affae2bf WD	61	{
	62	uchar sec, min, hour, mday, wday, mon, year;
	63	/* here check if rtc can be accessed */
	64	while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
53677ef1 WD	65	sec = rtc_read (RTC_SECONDS);
53677ef1 WD	66	min = rtc_read (RTC_MINUTES);
affae2bf WD	67	hour = rtc_read (RTC_HOURS);
	68	mday = rtc_read (RTC_DATE_OF_MONTH);
	69	wday = rtc_read (RTC_DAY_OF_WEEK);
53677ef1	70	mon = rtc_read (RTC_MONTH);
affae2bf	71	year = rtc_read (RTC_YEAR);
c7de829c WD	72	#ifdef CONFIG_AMIGAONEG3SE
	73	wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */
	74	#endif
affae2bf WD	75	#ifdef RTC_DEBUG
	76	printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
	77	"hr: %02x min: %02x sec: %02x\n",
c7de829c	78	year, mon, mday, wday,
affae2bf WD	79	hour, min, sec );
	80	printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
	81	rtc_read (RTC_CONFIG_D) & 0x3F,
	82	rtc_read (RTC_HOURS_ALARM),
	83	rtc_read (RTC_MINUTES_ALARM),
	84	rtc_read (RTC_SECONDS_ALARM) );
	85	#endif
	86	tmp->tm_sec = bcd2bin (sec & 0x7F);
	87	tmp->tm_min = bcd2bin (min & 0x7F);
	88	tmp->tm_hour = bcd2bin (hour & 0x3F);
	89	tmp->tm_mday = bcd2bin (mday & 0x3F);
	90	tmp->tm_mon = bcd2bin (mon & 0x1F);
	91	tmp->tm_year = bcd2bin (year);
	92	tmp->tm_wday = bcd2bin (wday & 0x07);
	93	if(tmp->tm_year<70)
	94	tmp->tm_year+=2000;
	95	else
	96	tmp->tm_year+=1900;
	97	tmp->tm_yday = 0;
	98	tmp->tm_isdst= 0;
	99	#ifdef RTC_DEBUG
	100	printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	101	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	102	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	103	#endif
b73a19e1 YT	104
b73a19e1 YT	105	return 0;
affae2bf WD	106	}
affae2bf WD	107
d1e23194	108	int rtc_set (struct rtc_time *tmp)
affae2bf WD	109	{
	110	#ifdef RTC_DEBUG
	111	printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	112	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	113	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	114	#endif
	115	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	116
	117	rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
	118	rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
c7de829c WD	119	#ifdef CONFIG_AMIGAONEG3SE
	120	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1);
	121	#else
affae2bf	122	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
c7de829c	123	#endif
affae2bf WD	124	rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
	125	rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
	126	rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
	127	rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
	128	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
	129
d1e23194	130	return 0;
affae2bf WD	131	}
	132
	133	void rtc_reset (void)
	134	{
	135	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	136	rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
	137	rtc_write(RTC_CONFIG_B,0x00);
	138	rtc_write(RTC_CONFIG_B,0x00);
	139	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
	140	}
	141
	142	/* ------------------------------------------------------------------------- */
	143
6d0f6bcf	144	#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
affae2bf WD	145	/*
	146	* use direct memory access
	147	*/
	148	static uchar rtc_read (uchar reg)
	149	{
6d0f6bcf	150	return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg));
affae2bf WD	151	}
	152
	153	static void rtc_write (uchar reg, uchar val)
	154	{
6d0f6bcf	155	out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val);
affae2bf WD	156	}
	157	#else
	158	static uchar rtc_read (uchar reg)
	159	{
	160	out8(RTC_PORT_MC146818,reg);
	161	return(in8(RTC_PORT_MC146818+1));
	162	}
	163
	164	static void rtc_write (uchar reg, uchar val)
	165	{
	166	out8(RTC_PORT_MC146818,reg);
	167	out8(RTC_PORT_MC146818+1,val);
	168	}
	169	#endif
	170
	171	static unsigned bcd2bin (uchar n)
	172	{
	173	return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
	174	}
	175
	176	static unsigned char bin2bcd (unsigned int n)
	177	{
	178	return (((n / 10) << 4) \| (n % 10));
	179	}
	180
068b60a0	181	#endif