[people/ms/u-boot.git] / drivers / rtc / ds174x.c

/*
 * (C) Copyright 2001
 * ARIO Data Networks, Inc. dchiu@ariodata.com
 *
 * Based on MontaVista DS1743 code and U-Boot mc146818 code
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Date & Time support for the DS174x RTC
 */

/*#define	DEBUG*/

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

#if defined(CONFIG_CMD_DATE)

static uchar rtc_read( unsigned int addr );
static void  rtc_write( unsigned int addr, uchar val);

#define RTC_BASE		( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )

#define RTC_YEAR		( RTC_BASE + 7 )
#define RTC_MONTH		( RTC_BASE + 6 )
#define RTC_DAY_OF_MONTH	( RTC_BASE + 5 )
#define RTC_DAY_OF_WEEK		( RTC_BASE + 4 )
#define RTC_HOURS		( RTC_BASE + 3 )
#define RTC_MINUTES		( RTC_BASE + 2 )
#define RTC_SECONDS		( RTC_BASE + 1 )
#define RTC_CENTURY		( RTC_BASE + 0 )

#define RTC_CONTROLA		RTC_CENTURY
#define RTC_CONTROLB		RTC_SECONDS
#define RTC_CONTROLC		RTC_DAY_OF_WEEK

#define RTC_CA_WRITE		0x80
#define RTC_CA_READ		0x40

#define RTC_CB_OSC_DISABLE	0x80

#define RTC_CC_BATTERY_FLAG	0x80
#define RTC_CC_FREQ_TEST	0x40

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

int rtc_get( struct rtc_time *tmp )
{
	uchar sec, min, hour;
	uchar mday, wday, mon, year;

	int century;

	uchar reg_a;

	reg_a = rtc_read( RTC_CONTROLA );
	/* lock clock registers for read */
	rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));

	sec     = rtc_read( RTC_SECONDS );
	min     = rtc_read( RTC_MINUTES );
	hour    = rtc_read( RTC_HOURS );
	mday    = rtc_read( RTC_DAY_OF_MONTH );
	wday    = rtc_read( RTC_DAY_OF_WEEK );
	mon     = rtc_read( RTC_MONTH );
	year    = rtc_read( RTC_YEAR );
	century = rtc_read( RTC_CENTURY );

	/* unlock clock registers after read */
	rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));

#ifdef RTC_DEBUG
	printf( "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 );
#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_wday = bcd2bin( wday & 0x07 );

	/* glue year from century and year in century */
	tmp->tm_year = bcd2bin( year ) +
		( bcd2bin( century & 0x3F ) * 100 );

	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 )
{
	uchar reg_a;
#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
	/* lock clock registers for write */
	reg_a = rtc_read( RTC_CONTROLA );
	rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));

	rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));

	rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
	rtc_write( RTC_DAY_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 ));

	/* break year up into century and year in century */
	rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
	rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 ));

	/* unlock clock registers after read */
	rtc_write( RTC_CONTROLA, ( reg_a  & ~RTC_CA_WRITE ));

	return 0;
}

void rtc_reset (void)
{
	uchar reg_a, reg_b, reg_c;

	reg_a = rtc_read( RTC_CONTROLA );
	reg_b = rtc_read( RTC_CONTROLB );

	if ( reg_b & RTC_CB_OSC_DISABLE )
	{
		printf( "real-time-clock was stopped. Now starting...\n" );
		reg_a |= RTC_CA_WRITE;
		reg_b &= ~RTC_CB_OSC_DISABLE;

		rtc_write( RTC_CONTROLA, reg_a );
		rtc_write( RTC_CONTROLB, reg_b );
	}

	/* make sure read/write clock register bits are cleared */
	reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
	rtc_write( RTC_CONTROLA, reg_a );

	reg_c = rtc_read( RTC_CONTROLC );
	if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 )
		printf( "RTC battery low. Clock setting may not be reliable.\n" );
}

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

static uchar rtc_read( unsigned int addr )
{
	uchar val = in8( addr );
#ifdef RTC_DEBUG
	printf( "rtc_read: %x:%x\n", addr, val );
#endif
	return( val );
}

static void rtc_write( unsigned int addr, uchar val )
{
#ifdef RTC_DEBUG
	printf( "rtc_write: %x:%x\n", addr, val );
#endif
	out8( addr, val );
}

#endif
Commit	Line	Data
5b1d7137 WD	1	/*
	2	* (C) Copyright 2001
	3	* ARIO Data Networks, Inc. dchiu@ariodata.com
	4	*
	5	* Based on MontaVista DS1743 code and U-Boot mc146818 code
	6	*
1a459660	7	* SPDX-License-Identifier: GPL-2.0+
5b1d7137 WD	8	*/
	9
	10	/*
	11	* Date & Time support for the DS174x RTC
	12	*/
	13
	14	/#define DEBUG/
	15
	16	#include <common.h>
	17	#include <command.h>
	18	#include <rtc.h>
	19
871c18dd	20	#if defined(CONFIG_CMD_DATE)
5b1d7137 WD	21
	22	static uchar rtc_read( unsigned int addr );
	23	static void rtc_write( unsigned int addr, uchar val);
5b1d7137	24
6d0f6bcf	25	#define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )
5b1d7137 WD	26
	27	#define RTC_YEAR ( RTC_BASE + 7 )
	28	#define RTC_MONTH ( RTC_BASE + 6 )
	29	#define RTC_DAY_OF_MONTH ( RTC_BASE + 5 )
	30	#define RTC_DAY_OF_WEEK ( RTC_BASE + 4 )
	31	#define RTC_HOURS ( RTC_BASE + 3 )
	32	#define RTC_MINUTES ( RTC_BASE + 2 )
	33	#define RTC_SECONDS ( RTC_BASE + 1 )
	34	#define RTC_CENTURY ( RTC_BASE + 0 )
	35
	36	#define RTC_CONTROLA RTC_CENTURY
	37	#define RTC_CONTROLB RTC_SECONDS
	38	#define RTC_CONTROLC RTC_DAY_OF_WEEK
	39
	40	#define RTC_CA_WRITE 0x80
	41	#define RTC_CA_READ 0x40
	42
	43	#define RTC_CB_OSC_DISABLE 0x80
	44
	45	#define RTC_CC_BATTERY_FLAG 0x80
	46	#define RTC_CC_FREQ_TEST 0x40
	47
	48	/* ------------------------------------------------------------------------- */
	49
b73a19e1	50	int rtc_get( struct rtc_time *tmp )
5b1d7137 WD	51	{
	52	uchar sec, min, hour;
	53	uchar mday, wday, mon, year;
	54
	55	int century;
	56
	57	uchar reg_a;
	58
	59	reg_a = rtc_read( RTC_CONTROLA );
	60	/* lock clock registers for read */
	61	rtc_write( RTC_CONTROLA, ( reg_a \| RTC_CA_READ ));
	62
	63	sec = rtc_read( RTC_SECONDS );
	64	min = rtc_read( RTC_MINUTES );
	65	hour = rtc_read( RTC_HOURS );
	66	mday = rtc_read( RTC_DAY_OF_MONTH );
	67	wday = rtc_read( RTC_DAY_OF_WEEK );
	68	mon = rtc_read( RTC_MONTH );
	69	year = rtc_read( RTC_YEAR );
	70	century = rtc_read( RTC_CENTURY );
	71
	72	/* unlock clock registers after read */
	73	rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
	74
	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",
	78	year, mon_cent, mday, wday,
	79	hour, min, sec );
	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_wday = bcd2bin( wday & 0x07 );
	87
	88	/* glue year from century and year in century */
	89	tmp->tm_year = bcd2bin( year ) +
	90	( bcd2bin( century & 0x3F ) * 100 );
	91
	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
53eec6f1	99	return 0;
5b1d7137 WD	100	}
5b1d7137 WD	101
d1e23194	102	int rtc_set( struct rtc_time *tmp )
5b1d7137 WD	103	{
	104	uchar reg_a;
	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	/* lock clock registers for write */
	111	reg_a = rtc_read( RTC_CONTROLA );
	112	rtc_write( RTC_CONTROLA, ( reg_a \| RTC_CA_WRITE ));
	113
	114	rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
	115
	116	rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
	117	rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
	118	rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
	119	rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
	120	rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
	121
	122	/* break year up into century and year in century */
	123	rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
	124	rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 ));
	125
	126	/* unlock clock registers after read */
	127	rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
d1e23194 JCPV	128
d1e23194 JCPV	129	return 0;
5b1d7137 WD	130	}
	131
	132	void rtc_reset (void)
	133	{
	134	uchar reg_a, reg_b, reg_c;
	135
	136	reg_a = rtc_read( RTC_CONTROLA );
	137	reg_b = rtc_read( RTC_CONTROLB );
	138
	139	if ( reg_b & RTC_CB_OSC_DISABLE )
	140	{
	141	printf( "real-time-clock was stopped. Now starting...\n" );
	142	reg_a \|= RTC_CA_WRITE;
	143	reg_b &= ~RTC_CB_OSC_DISABLE;
	144
	145	rtc_write( RTC_CONTROLA, reg_a );
	146	rtc_write( RTC_CONTROLB, reg_b );
	147	}
	148
	149	/* make sure read/write clock register bits are cleared */
	150	reg_a &= ~( RTC_CA_WRITE \| RTC_CA_READ );
	151	rtc_write( RTC_CONTROLA, reg_a );
	152
	153	reg_c = rtc_read( RTC_CONTROLC );
	154	if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 )
	155	printf( "RTC battery low. Clock setting may not be reliable.\n" );
	156	}
	157
	158	/* ------------------------------------------------------------------------- */
	159
	160	static uchar rtc_read( unsigned int addr )
	161	{
	162	uchar val = in8( addr );
	163	#ifdef RTC_DEBUG
	164	printf( "rtc_read: %x:%x\n", addr, val );
	165	#endif
	166	return( val );
	167	}
	168
	169	static void rtc_write( unsigned int addr, uchar val )
	170	{
	171	#ifdef RTC_DEBUG
	172	printf( "rtc_write: %x:%x\n", addr, val );
	173	#endif
	174	out8( addr, val );
	175	}
	176
068b60a0	177	#endif