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path: root/drivers/rtc/mcfrtc.c
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Diffstat (limited to 'drivers/rtc/mcfrtc.c')
-rw-r--r--drivers/rtc/mcfrtc.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/rtc/mcfrtc.c b/drivers/rtc/mcfrtc.c
new file mode 100644
index 00000000000..27386e586a6
--- /dev/null
+++ b/drivers/rtc/mcfrtc.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ *
+ * 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
+ */
+
+#include <common.h>
+
+#if defined(CONFIG_MCFRTC) && defined(CONFIG_CMD_DATE)
+
+#include <command.h>
+#include <rtc.h>
+#include <asm/immap.h>
+#include <asm/rtc.h>
+
+#undef RTC_DEBUG
+
+#ifndef CFG_MCFRTC_BASE
+#error RTC_BASE is not defined!
+#endif
+
+#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
+#define STARTOFTIME 1970
+
+void rtc_get(struct rtc_time *tmp)
+{
+ volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
+
+ int rtc_days, rtc_hrs, rtc_mins;
+ int tim;
+
+ rtc_days = rtc->days;
+ rtc_hrs = rtc->hourmin >> 8;
+ rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
+
+ tim = (rtc_days * 24) + rtc_hrs;
+ tim = (tim * 60) + rtc_mins;
+ tim = (tim * 60) + rtc->seconds;
+
+ to_tm(tim, tmp);
+
+ 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)
+{
+ volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
+
+ static int month_days[12] = {
+ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+ };
+ int days, i, months;
+
+ if (tmp->tm_year > 2037) {
+ printf("Unable to handle. Exceeding integer limitation!\n");
+ tmp->tm_year = 2027;
+ }
+#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
+
+ /* calculate days by years */
+ for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
+ days += 365 + isleap(i);
+ }
+
+ /* calculate days by months */
+ months = tmp->tm_mon - 1;
+ for (i = 0; i < months; i++) {
+ days += month_days[i];
+
+ if (i == 1)
+ days += isleap(i);
+ }
+
+ days += tmp->tm_mday - 1;
+
+ rtc->days = days;
+ rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
+ rtc->seconds = tmp->tm_sec;
+}
+
+void rtc_reset(void)
+{
+ volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
+
+ if ((rtc->cr & RTC_CR_EN) == 0) {
+ printf("real-time-clock was stopped. Now starting...\n");
+ rtc->cr |= RTC_CR_EN;
+ }
+
+ rtc->cr |= RTC_CR_SWR;
+}
+
+#endif /* CONFIG_MCFRTC && CONFIG_CMD_DATE */