Add support for DS12887 RTC; add RTC support for ATC board

1 files changed, 238 insertions, 0 deletions

diff --git a/rtc/ds12887.c b/rtc/ds12887.c
new file mode 100644
index 0000000..5d9c5dd
--- /dev/null
+++ b/rtc/ds12887.c
@@ -0,0 +1,238 @@
+/*
+ * (C) Copyright 2003
+ *
+ * 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 DS12887 RTC
+ */
+
+#undef	RTC_DEBUG
+
+#include <common.h>
+#include <command.h>
+#include <config.h>
+#include <rtc.h>
+
+#if defined(CONFIG_RTC_DS12887) && (CONFIG_COMMANDS & CFG_CMD_DATE)
+
+#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_CONTROL_A 			0x0A
+#define RTC_CONTROL_B 			0x0B
+#define RTC_CONTROL_C 			0x0C
+#define RTC_CONTROL_D			0x0D
+
+#define RTC_CA_UIP			0x80 
+#define RTC_CB_DM			0x04
+#define RTC_CB_24_12			0x02
+#define RTC_CB_SET			0x80
+
+#if defined(CONFIG_ATC)
+
+static uchar rtc_read (uchar reg)
+{
+	uchar val;
+    
+    	*(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
+	__asm__ __volatile__ ("sync");
+	
+	val = *(volatile unsigned char*)(RTC_PORT_DATA);
+	return (val);
+}
+
+static void rtc_write (uchar reg, uchar val)
+{
+    	*(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
+	__asm__ __volatile__ ("sync");
+
+	*(volatile unsigned char*)(RTC_PORT_DATA) = val;
+	__asm__ __volatile__ ("sync");
+}
+
+#else
+# error Board specific rtc access functions should be supplied
+#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));
+}
+
+/* ------------------------------------------------------------------------- */
+
+void rtc_get (struct rtc_time *tmp)
+{
+	uchar sec, min, hour, mday, wday, mon, year;
+
+	/* check if rtc is available for access */
+	while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP)
+		;
+    	
+	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 RTC_DEBUG
+	printf( "Get RTC year: %d; mon: %d; mday: %d; wday: %d; "
+		"hr: %d; min: %d; sec: %d\n",
+		year, mon, mday, wday, hour, min, sec );
+
+	printf ( "Alarms: hour: %02x min: %02x sec: %02x\n",
+		 rtc_read (RTC_HOURS_ALARM),
+		 rtc_read (RTC_MINUTES_ALARM),
+		 rtc_read (RTC_SECONDS_ALARM) );
+#endif
+
+	if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
+	{	    /* Information is in BCD format */
+printf(" Get: Convert BSD to BIN\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 & 0x1F);
+		tmp->tm_year = bcd2bin (year);
+		tmp->tm_wday = bcd2bin (wday & 0x07);
+	}
+else
+	{
+		tmp->tm_sec  = sec  & 0x7F;
+		tmp->tm_min  = min  & 0x7F;
+		tmp->tm_hour = hour & 0x3F;
+		tmp->tm_mday = mday & 0x3F;
+		tmp->tm_mon  = mon & 0x1F;
+		tmp->tm_year = year;
+		tmp->tm_wday = 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)
+{
+	uchar save_ctrl_b;
+	uchar sec, min, hour, mday, wday, mon, year;
+
+#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
+
+	if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
+	{	    /* Information is in BCD format */
+		year = bin2bcd(tmp->tm_year % 100);
+		mon  = bin2bcd(tmp->tm_mon);
+		wday = bin2bcd(tmp->tm_wday);
+		mday = bin2bcd(tmp->tm_mday);
+		hour = bin2bcd(tmp->tm_hour);
+		min  = bin2bcd(tmp->tm_min);
+		sec  = bin2bcd(tmp->tm_sec);
+	}
+	else
+	{
+		year = tmp->tm_year % 100;
+		mon  = tmp->tm_mon;
+		wday = tmp->tm_wday;
+		mday = tmp->tm_mday;
+		hour = tmp->tm_hour;
+		min  = tmp->tm_min;
+		sec  = tmp->tm_sec;
+	}
+	
+	/* disables the RTC to update the regs */
+	save_ctrl_b = rtc_read(RTC_CONTROL_B);
+	save_ctrl_b |= RTC_CB_SET;
+	rtc_write(RTC_CONTROL_B, save_ctrl_b); 
+
+	rtc_write (RTC_YEAR, year);
+	rtc_write (RTC_MONTH, mon);
+	rtc_write (RTC_DAY_OF_WEEK, wday);
+	rtc_write (RTC_DATE_OF_MONTH, mday);
+	rtc_write (RTC_HOURS, hour);
+	rtc_write (RTC_MINUTES, min);
+	rtc_write (RTC_SECONDS, sec);
+
+	/* enables the RTC to update the regs */
+	save_ctrl_b &= ~RTC_CB_SET;
+	rtc_write(RTC_CONTROL_B, save_ctrl_b); 
+}
+
+void rtc_reset (void)
+{
+	struct rtc_time tmp;
+	uchar ctrl_rg;
+    
+	ctrl_rg = RTC_CB_SET;
+	rtc_write(RTC_CONTROL_B,ctrl_rg); 
+    
+	tmp.tm_year = 1970 % 100;
+	tmp.tm_mon = 1;
+	tmp.tm_mday= 1;
+	tmp.tm_hour = 0;
+	tmp.tm_min = 0;
+	tmp.tm_sec = 0;
+				    
+#ifdef RTC_DEBUG
+        printf ( "RTC:   %4d-%02d-%02d %2d:%02d:%02d UTC\n",
+    		    tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
+		    tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
+#endif
+
+	ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM;
+	rtc_write(RTC_CONTROL_B,ctrl_rg); 
+    	rtc_set(&tmp);
+
+	rtc_write(RTC_HOURS_ALARM, 0),
+	rtc_write(RTC_MINUTES_ALARM, 0),	
+	rtc_write(RTC_SECONDS_ALARM, 0);
+					
+	ctrl_rg = RTC_CB_24_12 | RTC_CB_DM;
+	rtc_write(RTC_CONTROL_B,ctrl_rg); 
+}
+
+#endif  /* (CONFIG_RTC_DS12887) && (CONFIG_COMMANDS & CFG_CMD_DATE) */