From fe8c2806cdba70479e351299881a395dc2be7785 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sun, 3 Nov 2002 00:38:21 +0000
Subject: Initial revision

---
 rtc/pcf8563.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 rtc/pcf8563.c

(limited to 'rtc/pcf8563.c')

diff --git a/rtc/pcf8563.c b/rtc/pcf8563.c
new file mode 100644
index 0000000000..97b09b8725
--- /dev/null
+++ b/rtc/pcf8563.c
@@ -0,0 +1,144 @@
+/*
+ * (C) Copyright 2001
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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 Philips PCF8563 RTC
+ */
+
+/* #define	DEBUG	*/
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+#include <i2c.h>
+
+#if defined(CONFIG_RTC_PCF8563) && (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, mday, wday, mon_cent, year;
+
+	sec	= rtc_read (0x02);
+	min	= rtc_read (0x03);
+	hour	= rtc_read (0x04);
+	mday	= rtc_read (0x05);
+	wday	= rtc_read (0x06);
+	mon_cent= rtc_read (0x07);
+	year	= rtc_read (0x08);
+
+	debug ( "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 );
+	debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
+		rtc_read (0x0C),
+		rtc_read (0x0B),
+		rtc_read (0x0A),
+		rtc_read (0x09) );
+
+	if (sec & 0x80) {
+		printf ("### Warning: RTC Low Voltage - date/time not reliable\n");
+	}
+
+	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_cent & 0x1F);
+	tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
+	tmp->tm_wday = bcd2bin (wday & 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 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);
+
+	rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
+
+	century = (tmp->tm_year >= 2000) ? 0x80 : 0;
+	rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
+
+	rtc_write (0x06, bin2bcd(tmp->tm_wday));
+	rtc_write (0x05, bin2bcd(tmp->tm_mday));
+	rtc_write (0x04, bin2bcd(tmp->tm_hour));
+	rtc_write (0x03, bin2bcd(tmp->tm_min ));
+	rtc_write (0x02, bin2bcd(tmp->tm_sec ));
+}
+
+void rtc_reset (void)
+{
+	/* clear all control & status registers */
+	rtc_write (0x00, 0x00);
+	rtc_write (0x01, 0x00);
+	rtc_write (0x0D, 0x00);
+
+	/* clear Voltage Low bit */
+	rtc_write (0x02, rtc_read (0x02) & 0x7F);
+
+	/* reset all alarms */
+	rtc_write (0x09, 0x00);
+	rtc_write (0x0A, 0x00);
+	rtc_write (0x0B, 0x00);
+	rtc_write (0x0C, 0x00);
+}
+
+/* ------------------------------------------------------------------------- */
+
+static uchar rtc_read (uchar reg)
+{
+	return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg));
+}
+
+static void rtc_write (uchar reg, uchar val)
+{
+	i2c_reg_write (CFG_I2C_RTC_ADDR, 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_PCF8563 && CFG_CMD_DATE */
-- 
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