Merge commit '87ddedd'

1 files changed, 178 insertions, 0 deletions

diff --git a/drivers/rtc/mc146818.c b/drivers/rtc/mc146818.c
new file mode 100644
index 0000000..ab377ed
--- /dev/null
+++ b/drivers/rtc/mc146818.c
@@ -0,0 +1,178 @@
+/*
+ * (C) Copyright 2001
+ * Denis Peter MPL AG Switzerland. d.peter@mpl.ch
+ *
+ * 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 MC146818 (PIXX4) RTC
+ */
+
+/*#define	DEBUG*/
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+
+#if defined(CONFIG_RTC_MC146818) && defined(CONFIG_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);
+
+#define RTC_PORT_MC146818		CFG_ISA_IO_BASE_ADDRESS +  0x70
+#define RTC_SECONDS       	0x00
+#define RTC_SECONDS_ALARM 	0x01
+#define RTC_MINUTES 				0x02
+#define RTC_MINUTES_ALARM 	0x03
+#define RTC_HOURS 					0x04
+#define RTC_HOURS_ALARM 		0x05
+#define RTC_DAY_OF_WEEK 		0x06
+#define RTC_DATE_OF_MONTH 	0x07
+#define RTC_MONTH 					0x08
+#define RTC_YEAR 						0x09
+#define RTC_CONFIG_A 				0x0A
+#define RTC_CONFIG_B 				0x0B
+#define RTC_CONFIG_C 				0x0C
+#define RTC_CONFIG_D 				0x0D
+
+
+/* ------------------------------------------------------------------------- */
+
+void rtc_get (struct rtc_time *tmp)
+{
+	uchar sec, min, hour, mday, wday, mon, year;
+  /* here check if rtc can be accessed */
+	while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
+	sec		= rtc_read (RTC_SECONDS);
+	min		= rtc_read (RTC_MINUTES);
+	hour	= rtc_read (RTC_HOURS);
+	mday	= rtc_read (RTC_DATE_OF_MONTH);
+	wday	= rtc_read (RTC_DAY_OF_WEEK);
+	mon		= rtc_read (RTC_MONTH);
+	year	= rtc_read (RTC_YEAR);
+#ifdef CONFIG_AMIGAONEG3SE
+	wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */
+#endif
+#ifdef RTC_DEBUG
+	printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
+		"hr: %02x min: %02x sec: %02x\n",
+		year, mon, mday, wday,
+		hour, min, sec );
+	printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
+		rtc_read (RTC_CONFIG_D) & 0x3F,
+		rtc_read (RTC_HOURS_ALARM),
+		rtc_read (RTC_MINUTES_ALARM),
+		rtc_read (RTC_SECONDS_ALARM) );
+#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_year = bcd2bin (year);
+	tmp->tm_wday = bcd2bin (wday & 0x07);
+	if(tmp->tm_year<70)
+		tmp->tm_year+=2000;
+	else
+		tmp->tm_year+=1900;
+	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
+}
+
+void rtc_set (struct rtc_time *tmp)
+{
+#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
+	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
+
+	rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
+	rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
+#ifdef CONFIG_AMIGAONEG3SE
+	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1);
+#else
+	rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
+#endif
+	rtc_write (RTC_DATE_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 ));
+	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
+
+}
+
+void rtc_reset (void)
+{
+	rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
+	rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
+	rtc_write(RTC_CONFIG_B,0x00);
+	rtc_write(RTC_CONFIG_B,0x00);
+	rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
+}
+
+/* ------------------------------------------------------------------------- */
+
+#ifdef CFG_RTC_REG_BASE_ADDR
+/*
+ * use direct memory access
+ */
+static uchar rtc_read (uchar reg)
+{
+	return(in8(CFG_RTC_REG_BASE_ADDR+reg));
+}
+
+static void rtc_write (uchar reg, uchar val)
+{
+	out8(CFG_RTC_REG_BASE_ADDR+reg, val);
+}
+#else
+static uchar rtc_read (uchar reg)
+{
+	out8(RTC_PORT_MC146818,reg);
+	return(in8(RTC_PORT_MC146818+1));
+}
+
+static void rtc_write (uchar reg, uchar val)
+{
+	out8(RTC_PORT_MC146818,reg);
+	out8(RTC_PORT_MC146818+1,val);
+}
+#endif
+
+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