[people/ms/u-boot.git] / drivers / rtc / ds164x.c

/*
 * (C) Copyright 2002
 * ARIO Data Networks, Inc. dchiu@ariodata.com
 *
 * modified for DS164x:
 * The LEOX team <team@leox.org>, http://www.leox.org
 *
 * Based on MontaVista DS1743 code and U-Boot mc146818 code
 *
 * 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 DS164x RTC
 */

/* #define	RTC_DEBUG */

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


#if defined(CONFIG_RTC_DS164x) && defined(CONFIG_CMD_DATE)

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

#define RTC_EPOCH                 2000	/* century */

/*
 * DS164x registers layout
 */
#define RTC_BASE		( CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE )

#define RTC_YEAR		( RTC_BASE + 0x07 )
#define RTC_MONTH		( RTC_BASE + 0x06 )
#define RTC_DAY_OF_MONTH	( RTC_BASE + 0x05 )
#define RTC_DAY_OF_WEEK		( RTC_BASE + 0x04 )
#define RTC_HOURS		( RTC_BASE + 0x03 )
#define RTC_MINUTES		( RTC_BASE + 0x02 )
#define RTC_SECONDS		( RTC_BASE + 0x01 )
#define RTC_CONTROL		( RTC_BASE + 0x00 )

#define RTC_CONTROLA		RTC_CONTROL	/* W=bit6, R=bit5 */
#define   RTC_CA_WRITE		  0x80
#define   RTC_CA_READ		  0x40
#define RTC_CONTROLB		RTC_SECONDS	/* OSC=bit7       */
#define   RTC_CB_OSC_DISABLE	  0x80
#define RTC_CONTROLC		RTC_DAY_OF_WEEK	/* FT=bit6        */
#define   RTC_CC_FREQ_TEST	  0x40

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

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

	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 );

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

#ifdef RTC_DEBUG
	printf( "Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
		"hr: %02x min: %02x sec: %02x\n",
		year, 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 in century (2000) */
	tmp->tm_year = bcd2bin( year ) + RTC_EPOCH;

	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;
}

void 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 in century */
	rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));

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

void rtc_reset (void)
{
	uchar reg_a, reg_b;

	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 );
}

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

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;
}

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
3bac3513 WD	1	/*
	2	* (C) Copyright 2002
	3	* ARIO Data Networks, Inc. dchiu@ariodata.com
8bde7f77	4	*
3bac3513 WD	5	* modified for DS164x:
	6	* The LEOX team <team@leox.org>, http://www.leox.org
	7	*
	8	* Based on MontaVista DS1743 code and U-Boot mc146818 code
	9	*
	10	* See file CREDITS for list of people who contributed to this
	11	* project.
	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License as
	15	* published by the Free Software Foundation; either version 2 of
	16	* the License, or (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	26	* MA 02111-1307 USA
	27	*/
	28
	29	/*
	30	* Date & Time support for the DS164x RTC
	31	*/
	32
	33	/* #define RTC_DEBUG */
	34
	35	#include <common.h>
	36	#include <command.h>
	37	#include <rtc.h>
	38
	39
a593814f	40	#if defined(CONFIG_RTC_DS164x) && defined(CONFIG_CMD_DATE)
3bac3513 WD	41
	42	static uchar rtc_read(unsigned int addr );
	43	static void rtc_write(unsigned int addr, uchar val);
	44	static uchar bin2bcd(unsigned int n);
	45	static unsigned bcd2bin(uchar c);
	46
	47	#define RTC_EPOCH 2000 /* century */
	48
	49	/*
	50	* DS164x registers layout
	51	*/
	52	#define RTC_BASE ( CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE )
	53
	54	#define RTC_YEAR ( RTC_BASE + 0x07 )
	55	#define RTC_MONTH ( RTC_BASE + 0x06 )
	56	#define RTC_DAY_OF_MONTH ( RTC_BASE + 0x05 )
	57	#define RTC_DAY_OF_WEEK ( RTC_BASE + 0x04 )
	58	#define RTC_HOURS ( RTC_BASE + 0x03 )
	59	#define RTC_MINUTES ( RTC_BASE + 0x02 )
	60	#define RTC_SECONDS ( RTC_BASE + 0x01 )
	61	#define RTC_CONTROL ( RTC_BASE + 0x00 )
	62
	63	#define RTC_CONTROLA RTC_CONTROL /* W=bit6, R=bit5 */
	64	#define RTC_CA_WRITE 0x80
	65	#define RTC_CA_READ 0x40
	66	#define RTC_CONTROLB RTC_SECONDS /* OSC=bit7 */
	67	#define RTC_CB_OSC_DISABLE 0x80
	68	#define RTC_CONTROLC RTC_DAY_OF_WEEK /* FT=bit6 */
	69	#define RTC_CC_FREQ_TEST 0x40
	70
	71	/* ------------------------------------------------------------------------- */
	72
b73a19e1	73	int rtc_get( struct rtc_time *tmp )
3bac3513 WD	74	{
	75	uchar sec, min, hour;
	76	uchar mday, wday, mon, year;
	77
	78	uchar reg_a;
	79
	80	reg_a = rtc_read( RTC_CONTROLA );
	81	/* lock clock registers for read */
	82	rtc_write( RTC_CONTROLA, ( reg_a \| RTC_CA_READ ));
	83
	84	sec = rtc_read( RTC_SECONDS );
	85	min = rtc_read( RTC_MINUTES );
	86	hour = rtc_read( RTC_HOURS );
	87	mday = rtc_read( RTC_DAY_OF_MONTH );
	88	wday = rtc_read( RTC_DAY_OF_WEEK );
	89	mon = rtc_read( RTC_MONTH );
	90	year = rtc_read( RTC_YEAR );
	91
	92	/* unlock clock registers after read */
	93	rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
	94
	95	#ifdef RTC_DEBUG
	96	printf( "Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
	97	"hr: %02x min: %02x sec: %02x\n",
	98	year, mon, mday, wday,
	99	hour, min, sec );
	100	#endif
	101	tmp->tm_sec = bcd2bin( sec & 0x7F );
	102	tmp->tm_min = bcd2bin( min & 0x7F );
	103	tmp->tm_hour = bcd2bin( hour & 0x3F );
	104	tmp->tm_mday = bcd2bin( mday & 0x3F );
	105	tmp->tm_mon = bcd2bin( mon & 0x1F );
	106	tmp->tm_wday = bcd2bin( wday & 0x07 );
	107
	108	/* glue year in century (2000) */
	109	tmp->tm_year = bcd2bin( year ) + RTC_EPOCH;
	110
	111	tmp->tm_yday = 0;
	112	tmp->tm_isdst= 0;
	113	#ifdef RTC_DEBUG
	114	printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	115	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	116	tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
	117	#endif
b73a19e1 YT	118
b73a19e1 YT	119	return 0;
3bac3513 WD	120	}
	121
	122	void rtc_set( struct rtc_time *tmp )
	123	{
	124	uchar reg_a;
	125
	126	#ifdef RTC_DEBUG
	127	printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	128	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	129	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	130	#endif
	131	/* lock clock registers for write */
	132	reg_a = rtc_read( RTC_CONTROLA );
	133	rtc_write( RTC_CONTROLA, ( reg_a \| RTC_CA_WRITE ));
	134
	135	rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
	136
	137	rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
	138	rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
	139	rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
	140	rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
	141	rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
	142
	143	/* break year in century */
	144	rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
	145
	146	/* unlock clock registers after read */
	147	rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
	148	}
	149
	150	void rtc_reset (void)
	151	{
	152	uchar reg_a, reg_b;
	153
	154	reg_a = rtc_read( RTC_CONTROLA );
	155	reg_b = rtc_read( RTC_CONTROLB );
	156
	157	if ( reg_b & RTC_CB_OSC_DISABLE )
	158	{
	159	printf( "real-time-clock was stopped. Now starting...\n" );
	160	reg_a \|= RTC_CA_WRITE;
	161	reg_b &= ~RTC_CB_OSC_DISABLE;
	162
	163	rtc_write( RTC_CONTROLA, reg_a );
	164	rtc_write( RTC_CONTROLB, reg_b );
	165	}
	166
	167	/* make sure read/write clock register bits are cleared */
	168	reg_a &= ~( RTC_CA_WRITE \| RTC_CA_READ );
	169	rtc_write( RTC_CONTROLA, reg_a );
	170	}
	171
	172	/* ------------------------------------------------------------------------- */
	173
	174	static uchar rtc_read( unsigned int addr )
	175	{
	176	uchar val = (volatile unsigned char)(addr);
	177
	178	#ifdef RTC_DEBUG
	179	printf( "rtc_read: %x:%x\n", addr, val );
	180	#endif
	181	return( val );
	182	}
	183
184	static void rtc_write( unsigned int addr, uchar val )
185	{
186	#ifdef RTC_DEBUG
187	printf( "rtc_write: %x:%x\n", addr, val );
188	#endif
189	(volatile unsigned char)(addr) = val;
190	}
191
192	static unsigned bcd2bin (uchar n)
193	{
194	return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
195	}
196
197	static unsigned char bin2bcd (unsigned int n)
198	{
199	return (((n / 10) << 4) \| (n % 10));
200	}
201
068b60a0	202	#endif