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-rw-r--r--rtc/ds12887.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/rtc/ds12887.c b/rtc/ds12887.c
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--- /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) */
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