[u-boot.git] / rtc / m48t35ax.c

/*
 * (C) Copyright 2001
 * Erik Theisen,  Wave 7 Optics, [email protected].
 *
 * 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 ST Electronics M48T35Ax RTC
 */

/*#define       DEBUG */


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

#if defined(CONFIG_RTC_M48T35A) && (CONFIG_COMMANDS & CFG_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);

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

void rtc_get (struct rtc_time *tmp)
{
	uchar sec, min, hour, cent_day, date, month, year;
	uchar ccr;			/* Clock control register */

	/* Lock RTC for read using clock control register */
	ccr = rtc_read(0);
	ccr = ccr | 0x40;
	rtc_write(0, ccr);

	sec	= rtc_read (0x1);
	min	= rtc_read (0x2);
	hour	= rtc_read (0x3);
	cent_day= rtc_read (0x4);
	date	= rtc_read (0x5);
	month   = rtc_read (0x6);
	year	= rtc_read (0x7);

	/* UNLock RTC */
	ccr = rtc_read(0);
	ccr = ccr & 0xBF;
	rtc_write(0, ccr);

	debug ( "Get RTC year: %02x month: %02x date: %02x cent_day: %02x "
		"hr: %02x min: %02x sec: %02x\n",
		year, month, date, cent_day,
		hour, min, sec );

	tmp->tm_sec  = bcd2bin (sec  & 0x7F);
	tmp->tm_min  = bcd2bin (min  & 0x7F);
	tmp->tm_hour = bcd2bin (hour & 0x3F);
	tmp->tm_mday = bcd2bin (date & 0x3F);
	tmp->tm_mon  = bcd2bin (month & 0x1F);
	tmp->tm_year = bcd2bin (year) + ((cent_day & 0x10) ? 2000 : 1900);
	tmp->tm_wday = bcd2bin (cent_day & 0x07);
	tmp->tm_yday = 0;
	tmp->tm_isdst= 0;

	debug ( "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);
}

void rtc_set (struct rtc_time *tmp)
{
	uchar ccr;			/* Clock control register */
	uchar century;

	debug ( "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);

	/* Lock RTC for write using clock control register */
	ccr = rtc_read(0);
	ccr = ccr | 0x80;
	rtc_write(0, ccr);

	rtc_write (0x07, bin2bcd(tmp->tm_year % 100));
	rtc_write (0x06, bin2bcd(tmp->tm_mon));
	rtc_write (0x05, bin2bcd(tmp->tm_mday));

	century = ((tmp->tm_year >= 2000) ? 0x10 : 0) | 0x20;
	rtc_write (0x04, bin2bcd(tmp->tm_wday) | century);

	rtc_write (0x03, bin2bcd(tmp->tm_hour));
	rtc_write (0x02, bin2bcd(tmp->tm_min ));
	rtc_write (0x01, bin2bcd(tmp->tm_sec ));

	/* UNLock RTC */
	ccr = rtc_read(0);
	ccr = ccr & 0x7F;
	rtc_write(0, ccr);
}

void rtc_reset (void)
{
	uchar val;

	/* Clear all clock control registers */
	rtc_write (0x0, 0x80);		/* No Read Lock or calibration */

	/* Clear stop bit */
	val = rtc_read (0x1);
	val &= 0x7f;
	rtc_write(0x1, val);

	/* Enable century / disable frequency test */
	val = rtc_read (0x4);
	val = (val & 0xBF) | 0x20;
	rtc_write(0x4, val);

	/* Clear write lock */
	rtc_write(0x0, 0);
}

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

static uchar rtc_read (uchar reg)
{
	uchar val;
	val = *(unsigned char *)
		((CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE - 8) + reg);
	return val;
}

static void rtc_write (uchar reg, uchar val)
{
	*(unsigned char *)
		((CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE - 8) + reg) = 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	/* CONFIG_RTC_M48T35A && CFG_CMD_DATE */
Commit	Line	Data
affae2bf WD	1	/*
	2	* (C) Copyright 2001
	3	* Erik Theisen, Wave 7 Optics, [email protected].
	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 ST Electronics M48T35Ax RTC
	26	*/
	27
	28	/#define DEBUG /
	29
	30
	31	#include <common.h>
	32	#include <command.h>
	33	#include <rtc.h>
	34	#include <config.h>
	35
	36	#if defined(CONFIG_RTC_M48T35A) && (CONFIG_COMMANDS & CFG_CMD_DATE)
	37
	38	static uchar rtc_read (uchar reg);
	39	static void rtc_write (uchar reg, uchar val);
	40	static uchar bin2bcd (unsigned int n);
	41	static unsigned bcd2bin(uchar c);
	42
	43	/* ------------------------------------------------------------------------- */
	44
	45	void rtc_get (struct rtc_time *tmp)
	46	{
	47	uchar sec, min, hour, cent_day, date, month, year;
	48	uchar ccr; /* Clock control register */
	49
	50	/* Lock RTC for read using clock control register */
	51	ccr = rtc_read(0);
	52	ccr = ccr \| 0x40;
	53	rtc_write(0, ccr);
	54
	55	sec = rtc_read (0x1);
	56	min = rtc_read (0x2);
	57	hour = rtc_read (0x3);
	58	cent_day= rtc_read (0x4);
	59	date = rtc_read (0x5);
	60	month = rtc_read (0x6);
	61	year = rtc_read (0x7);
	62
	63	/* UNLock RTC */
	64	ccr = rtc_read(0);
65	ccr = ccr & 0xBF;
66	rtc_write(0, ccr);
67
68	debug ( "Get RTC year: %02x month: %02x date: %02x cent_day: %02x "
69	"hr: %02x min: %02x sec: %02x\n",
70	year, month, date, cent_day,
71	hour, min, sec );
72
73	tmp->tm_sec = bcd2bin (sec & 0x7F);
74	tmp->tm_min = bcd2bin (min & 0x7F);
75	tmp->tm_hour = bcd2bin (hour & 0x3F);
76	tmp->tm_mday = bcd2bin (date & 0x3F);
77	tmp->tm_mon = bcd2bin (month & 0x1F);
78	tmp->tm_year = bcd2bin (year) + ((cent_day & 0x10) ? 2000 : 1900);
79	tmp->tm_wday = bcd2bin (cent_day & 0x07);
80	tmp->tm_yday = 0;
81	tmp->tm_isdst= 0;
82
83	debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
84	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
85	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
86	}
87
88	void rtc_set (struct rtc_time *tmp)
89	{
90	uchar ccr; /* Clock control register */
91	uchar century;
92
93	debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
94	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
95	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
96
97	/* Lock RTC for write using clock control register */
98	ccr = rtc_read(0);
99	ccr = ccr \| 0x80;
100	rtc_write(0, ccr);
101
102	rtc_write (0x07, bin2bcd(tmp->tm_year % 100));
103	rtc_write (0x06, bin2bcd(tmp->tm_mon));
104	rtc_write (0x05, bin2bcd(tmp->tm_mday));
105
106	century = ((tmp->tm_year >= 2000) ? 0x10 : 0) \| 0x20;
107	rtc_write (0x04, bin2bcd(tmp->tm_wday) \| century);
108
109	rtc_write (0x03, bin2bcd(tmp->tm_hour));
110	rtc_write (0x02, bin2bcd(tmp->tm_min ));
111	rtc_write (0x01, bin2bcd(tmp->tm_sec ));
112
113	/* UNLock RTC */
114	ccr = rtc_read(0);
115	ccr = ccr & 0x7F;
116	rtc_write(0, ccr);
117	}
118
119	void rtc_reset (void)
120	{
121	uchar val;
122
123	/* Clear all clock control registers */
124	rtc_write (0x0, 0x80); /* No Read Lock or calibration */
125
126	/* Clear stop bit */
127	val = rtc_read (0x1);
128	val &= 0x7f;
129	rtc_write(0x1, val);
130
131	/* Enable century / disable frequency test */
132	val = rtc_read (0x4);
133	val = (val & 0xBF) \| 0x20;
134	rtc_write(0x4, val);
135
136	/* Clear write lock */
137	rtc_write(0x0, 0);
138	}
139
140	/* ------------------------------------------------------------------------- */
141
142	static uchar rtc_read (uchar reg)
143	{
144	uchar val;
145	val = (unsigned char )
146	((CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE - 8) + reg);
147	return val;
148	}
149
150	static void rtc_write (uchar reg, uchar val)
151	{
152	(unsigned char )
153	((CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE - 8) + reg) = val;
154	}
155
156	static unsigned bcd2bin (uchar n)
157	{
158	return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
159	}
160
161	static unsigned char bin2bcd (unsigned int n)
162	{
163	return (((n / 10) << 4) \| (n % 10));
164	}
165
166	#endif /* CONFIG_RTC_M48T35A && CFG_CMD_DATE */