drivers/rtc: add Marvell Integrated RTC
This driver can be used for kirkwood SoCs by enabling CONFIG_RTC_MV. Tested on
Global Scale Technologies Dreamplug.
Signed-off-by: Jason Cooper <u-boot@lakedaemon.net>
diff --git a/drivers/rtc/mvrtc.c b/drivers/rtc/mvrtc.c
new file mode 100644
index 0000000..ccc573a
--- /dev/null
+++ b/drivers/rtc/mvrtc.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2011
+ * Jason Cooper <u-boot@lakedaemon.net>
+ *
+ * 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 Marvell Integrated RTC
+ */
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+#include "mvrtc.h"
+
+/* This RTC does not support century, so we assume 20 */
+#define CENTURY 20
+
+int rtc_get(struct rtc_time *t)
+{
+ u32 time;
+ u32 date;
+ struct mvrtc_registers *mvrtc_regs;
+
+ mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
+
+ /* read the time register */
+ time = readl(&mvrtc_regs->time);
+
+ /* read the date register */
+ date = readl(&mvrtc_regs->date);
+
+ /* test for 12 hour clock (can't tell if it's am/pm) */
+ if (time & MVRTC_HRFMT_MSK) {
+ printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
+ return -1;
+ }
+
+ /* time */
+ t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
+ t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
+ t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
+ t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
+ t->tm_wday--;
+
+ /* date */
+ t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
+ t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK);
+ t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
+ t->tm_year += CENTURY * 100;
+
+ /* not supported in this RTC */
+ t->tm_yday = 0;
+ t->tm_isdst = 0;
+
+ return 0;
+}
+
+int rtc_set(struct rtc_time *t)
+{
+ u32 time = 0; /* sets hour format bit to zero, 24hr format. */
+ u32 date = 0;
+ struct mvrtc_registers *mvrtc_regs;
+
+ mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
+
+ /* check that this code isn't 80+ years old ;-) */
+ if ((t->tm_year / 100) != CENTURY)
+ printf("Warning: Only century %d supported.\n", CENTURY);
+
+ /* time */
+ time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT;
+ time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT;
+ time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
+ time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT;
+
+ /* date */
+ date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
+ date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT;
+ date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
+
+ /* write the time register */
+ writel(time, &mvrtc_regs->time);
+
+ /* write the date register */
+ writel(date, &mvrtc_regs->date);
+
+ return 0;
+}
+
+void rtc_reset(void)
+{
+ u32 time;
+ u32 sec;
+ struct mvrtc_registers *mvrtc_regs;
+
+ mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
+
+ /* no init routine for this RTC needed, just check that it's working */
+ time = readl(&mvrtc_regs->time);
+ sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
+ udelay(1000000);
+ time = readl(&mvrtc_regs->time);
+
+ if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
+ printf("Error: RTC did not increment.\n");
+}