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

/*
 * (C) Copyright 2001
 * Denis Peter MPL AG Switzerland. d.peter@mpl.ch
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Date & Time support for the MC146818 (PIXX4) RTC
 */

/*#define	DEBUG*/

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

#if defined(__I386__) || defined(CONFIG_MALTA)
#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	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
affae2bf WD	6	*/
	7
	8	/*
	9	* Date & Time support for the MC146818 (PIXX4) RTC
	10	*/
	11
	12	/#define DEBUG/
	13
	14	#include <common.h>
	15	#include <command.h>
	16	#include <rtc.h>
	17
3ced12a0	18	#if defined(__I386__) \|\| defined(CONFIG_MALTA)
21831001 GR	19	#include <asm/io.h>
	20	#define in8(p) inb(p)
	21	#define out8(p, v) outb(v, p)
	22	#endif
	23
871c18dd	24	#if defined(CONFIG_CMD_DATE)
affae2bf WD	25
	26	static uchar rtc_read (uchar reg);
	27	static void rtc_write (uchar reg, uchar val);
affae2bf	28
6d0f6bcf	29	#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
53677ef1 WD	30	#define RTC_SECONDS 0x00
	31	#define RTC_SECONDS_ALARM 0x01
	32	#define RTC_MINUTES 0x02
	33	#define RTC_MINUTES_ALARM 0x03
	34	#define RTC_HOURS 0x04
	35	#define RTC_HOURS_ALARM 0x05
	36	#define RTC_DAY_OF_WEEK 0x06
	37	#define RTC_DATE_OF_MONTH 0x07
	38	#define RTC_MONTH 0x08
	39	#define RTC_YEAR 0x09
	40	#define RTC_CONFIG_A 0x0A
	41	#define RTC_CONFIG_B 0x0B
	42	#define RTC_CONFIG_C 0x0C
	43	#define RTC_CONFIG_D 0x0D
affae2bf WD	44
	45
	46	/* ------------------------------------------------------------------------- */
	47
b73a19e1	48	int rtc_get (struct rtc_time *tmp)
affae2bf WD	49	{
	50	uchar sec, min, hour, mday, wday, mon, year;
	51	/* here check if rtc can be accessed */
	52	while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
53677ef1 WD	53	sec = rtc_read (RTC_SECONDS);
53677ef1 WD	54	min = rtc_read (RTC_MINUTES);
affae2bf WD	55	hour = rtc_read (RTC_HOURS);
	56	mday = rtc_read (RTC_DATE_OF_MONTH);
	57	wday = rtc_read (RTC_DAY_OF_WEEK);
53677ef1	58	mon = rtc_read (RTC_MONTH);
affae2bf WD	59	year = rtc_read (RTC_YEAR);
	60	#ifdef RTC_DEBUG
	61	printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
	62	"hr: %02x min: %02x sec: %02x\n",
c7de829c	63	year, mon, mday, wday,
affae2bf WD	64	hour, min, sec );
	65	printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
	66	rtc_read (RTC_CONFIG_D) & 0x3F,
	67	rtc_read (RTC_HOURS_ALARM),
	68	rtc_read (RTC_MINUTES_ALARM),
	69	rtc_read (RTC_SECONDS_ALARM) );
	70	#endif
	71	tmp->tm_sec = bcd2bin (sec & 0x7F);
	72	tmp->tm_min = bcd2bin (min & 0x7F);
	73	tmp->tm_hour = bcd2bin (hour & 0x3F);
	74	tmp->tm_mday = bcd2bin (mday & 0x3F);
	75	tmp->tm_mon = bcd2bin (mon & 0x1F);
	76	tmp->tm_year = bcd2bin (year);
	77	tmp->tm_wday = bcd2bin (wday & 0x07);
	78	if(tmp->tm_year<70)
	79	tmp->tm_year+=2000;
	80	else
	81	tmp->tm_year+=1900;
	82	tmp->tm_yday = 0;
	83	tmp->tm_isdst= 0;
	84	#ifdef RTC_DEBUG
	85	printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	86	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	87	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	88	#endif
b73a19e1 YT	89
b73a19e1 YT	90	return 0;
affae2bf WD	91	}
affae2bf WD	92
d1e23194	93	int rtc_set (struct rtc_time *tmp)
affae2bf WD	94	{
	95	#ifdef RTC_DEBUG
	96	printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	97	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	98	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	99	#endif
	100	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	101
	102	rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
	103	rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
affae2bf WD	104	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
	105	rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
	106	rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
	107	rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
	108	rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
	109	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
	110
d1e23194	111	return 0;
affae2bf WD	112	}
	113
	114	void rtc_reset (void)
	115	{
	116	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
	117	rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
	118	rtc_write(RTC_CONFIG_B,0x00);
	119	rtc_write(RTC_CONFIG_B,0x00);
	120	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
	121	}
	122
	123	/* ------------------------------------------------------------------------- */
	124
6d0f6bcf	125	#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
affae2bf WD	126	/*
	127	* use direct memory access
	128	*/
	129	static uchar rtc_read (uchar reg)
	130	{
6d0f6bcf	131	return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg));
affae2bf WD	132	}
	133
	134	static void rtc_write (uchar reg, uchar val)
	135	{
6d0f6bcf	136	out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val);
affae2bf WD	137	}
	138	#else
	139	static uchar rtc_read (uchar reg)
	140	{
	141	out8(RTC_PORT_MC146818,reg);
	142	return(in8(RTC_PORT_MC146818+1));
	143	}
	144
	145	static void rtc_write (uchar reg, uchar val)
	146	{
	147	out8(RTC_PORT_MC146818,reg);
	148	out8(RTC_PORT_MC146818+1,val);
	149	}
	150	#endif
	151
068b60a0	152	#endif