[people/ms/u-boot.git] / drivers / rtc / ds1556.c

/*
 * (C) Copyright 2002
 * ARIO Data Networks, Inc. dchiu@ariodata.com
 *
 * modified for DS1556:
 * Frank Panno <fpanno@delphintech.com>, Delphin Technology AG
 *
 * Based on MontaVista DS1743 code and U-Boot mc146818 code
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Date & Time support for the DS1556 RTC
 */

/*#define	RTC_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 + 0xf )
#define RTC_MONTH		( RTC_BASE + 0xe )
#define RTC_DAY_OF_MONTH	( RTC_BASE + 0xd )
#define RTC_DAY_OF_WEEK		( RTC_BASE + 0xc )
#define RTC_HOURS		( RTC_BASE + 0xb )
#define RTC_MINUTES		( RTC_BASE + 0xa )
#define RTC_SECONDS		( RTC_BASE + 0x9 )
#define RTC_CENTURY		( RTC_BASE + 0x8 )

#define RTC_CONTROLA		RTC_CENTURY
#define RTC_CONTROLB		RTC_SECONDS
#define RTC_CONTROLC		RTC_BASE

#define RTC_CA_WRITE		0x80
#define RTC_CA_READ		0x40

#define RTC_CB_OSC_DISABLE	0x80

#define RTC_CC_BATTERY_FLAG	0x10
#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 mon: %02x mday: %02x wday: %02x "
		"hr: %02x min: %02x sec: %02x\n",
		year, century, mon, 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 = *(volatile unsigned char*)(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
	*(volatile unsigned char*)(addr) = val;
}

#endif
Commit	Line	Data
c609719b WD	1	/*
	2	* (C) Copyright 2002
	3	* ARIO Data Networks, Inc. dchiu@ariodata.com
	4	*
	5	* modified for DS1556:
	6	* Frank Panno <fpanno@delphintech.com>, Delphin Technology AG
	7	*
	8	* Based on MontaVista DS1743 code and U-Boot mc146818 code
	9	*
1a459660	10	* SPDX-License-Identifier: GPL-2.0+
c609719b WD	11	*/
	12
	13	/*
	14	* Date & Time support for the DS1556 RTC
	15	*/
	16
	17	/#define RTC_DEBUG /
	18
	19	#include <common.h>
	20	#include <command.h>
	21	#include <rtc.h>
	22
871c18dd	23	#if defined(CONFIG_CMD_DATE)
c609719b WD	24
	25	static uchar rtc_read( unsigned int addr );
	26	static void rtc_write( unsigned int addr, uchar val);
c609719b	27
6d0f6bcf	28	#define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )
c609719b WD	29
	30	#define RTC_YEAR ( RTC_BASE + 0xf )
	31	#define RTC_MONTH ( RTC_BASE + 0xe )
	32	#define RTC_DAY_OF_MONTH ( RTC_BASE + 0xd )
	33	#define RTC_DAY_OF_WEEK ( RTC_BASE + 0xc )
	34	#define RTC_HOURS ( RTC_BASE + 0xb )
	35	#define RTC_MINUTES ( RTC_BASE + 0xa )
	36	#define RTC_SECONDS ( RTC_BASE + 0x9 )
	37	#define RTC_CENTURY ( RTC_BASE + 0x8 )
	38
	39	#define RTC_CONTROLA RTC_CENTURY
	40	#define RTC_CONTROLB RTC_SECONDS
	41	#define RTC_CONTROLC RTC_BASE
	42
	43	#define RTC_CA_WRITE 0x80
	44	#define RTC_CA_READ 0x40
	45
	46	#define RTC_CB_OSC_DISABLE 0x80
	47
	48	#define RTC_CC_BATTERY_FLAG 0x10
	49	#define RTC_CC_FREQ_TEST 0x40
	50
	51	/* ------------------------------------------------------------------------- */
	52
b73a19e1	53	int rtc_get( struct rtc_time *tmp )
c609719b WD	54	{
	55	uchar sec, min, hour;
	56	uchar mday, wday, mon, year;
	57
	58	int century;
	59
	60	uchar reg_a;
	61
	62	reg_a = rtc_read( RTC_CONTROLA );
	63	/* lock clock registers for read */
	64	rtc_write( RTC_CONTROLA, ( reg_a \| RTC_CA_READ ));
	65
	66	sec = rtc_read( RTC_SECONDS );
	67	min = rtc_read( RTC_MINUTES );
	68	hour = rtc_read( RTC_HOURS );
	69	mday = rtc_read( RTC_DAY_OF_MONTH );
	70	wday = rtc_read( RTC_DAY_OF_WEEK );
	71	mon = rtc_read( RTC_MONTH );
	72	year = rtc_read( RTC_YEAR );
	73	century = rtc_read( RTC_CENTURY );
	74
	75	/* unlock clock registers after read */
	76	rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
	77
	78	#ifdef RTC_DEBUG
	79	printf( "Get RTC year: %02x mon/cent: %02x mon: %02x mday: %02x wday: %02x "
	80	"hr: %02x min: %02x sec: %02x\n",
	81	year, century, mon, mday, wday,
	82	hour, min, sec );
	83	#endif
	84	tmp->tm_sec = bcd2bin( sec & 0x7F );
	85	tmp->tm_min = bcd2bin( min & 0x7F );
	86	tmp->tm_hour = bcd2bin( hour & 0x3F );
	87	tmp->tm_mday = bcd2bin( mday & 0x3F );
	88	tmp->tm_mon = bcd2bin( mon & 0x1F );
	89	tmp->tm_wday = bcd2bin( wday & 0x07 );
	90
	91	/* glue year from century and year in century */
	92	tmp->tm_year = bcd2bin( year ) +
	93	( bcd2bin( century & 0x3F ) * 100 );
	94
	95	tmp->tm_yday = 0;
	96	tmp->tm_isdst= 0;
	97	#ifdef RTC_DEBUG
	98	printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	99	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	100	tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
	101	#endif
b73a19e1	102	return 0;
c609719b WD	103	}
c609719b WD	104
d1e23194	105	int rtc_set( struct rtc_time *tmp )
c609719b WD	106	{
	107	uchar reg_a;
	108	#ifdef RTC_DEBUG
	109	printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	110	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	111	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	112	#endif
	113	/* lock clock registers for write */
	114	reg_a = rtc_read( RTC_CONTROLA );
	115	rtc_write( RTC_CONTROLA, ( reg_a \| RTC_CA_WRITE ));
	116
	117	rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
	118
	119	rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
	120	rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
	121	rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
	122	rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
	123	rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
	124
	125	/* break year up into century and year in century */
	126	rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
	127	rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 ));
	128
	129	/* unlock clock registers after read */
	130	rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
d1e23194 JCPV	131
d1e23194 JCPV	132	return 0;
c609719b WD	133	}
	134
	135	void rtc_reset (void)
	136	{
	137	uchar reg_a, reg_b, reg_c;
	138
	139	reg_a = rtc_read( RTC_CONTROLA );
	140	reg_b = rtc_read( RTC_CONTROLB );
	141
	142	if ( reg_b & RTC_CB_OSC_DISABLE )
	143	{
	144	printf( "real-time-clock was stopped. Now starting...\n" );
	145	reg_a \|= RTC_CA_WRITE;
	146	reg_b &= ~RTC_CB_OSC_DISABLE;
	147
	148	rtc_write( RTC_CONTROLA, reg_a );
	149	rtc_write( RTC_CONTROLB, reg_b );
	150	}
	151
	152	/* make sure read/write clock register bits are cleared */
	153	reg_a &= ~( RTC_CA_WRITE \| RTC_CA_READ );
	154	rtc_write( RTC_CONTROLA, reg_a );
	155
	156	reg_c = rtc_read( RTC_CONTROLC );
	157	if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 )
	158	printf( "RTC battery low. Clock setting may not be reliable.\n" );
	159	}
	160
	161	/* ------------------------------------------------------------------------- */
	162
	163	static uchar rtc_read( unsigned int addr )
	164	{
	165	uchar val = (volatile unsigned char)(addr);
	166	#ifdef RTC_DEBUG
	167	printf( "rtc_read: %x:%x\n", addr, val );
	168	#endif
	169	return( val );
	170	}
	171
	172	static void rtc_write( unsigned int addr, uchar val )
	173	{
	174	#ifdef RTC_DEBUG
	175	printf( "rtc_write: %x:%x\n", addr, val );
	176	#endif
	177	(volatile unsigned char)(addr) = val;
	178	}
	179
068b60a0	180	#endif