arm: A320: driver for FTRTC010 real time clock

This patch adds an FTRTC010 driver for Faraday A320 evaluation board.

Signed-off-by: Po-Yu Chuang <ratbert@faraday-tech.com>

drivers/rtc/Makefile

@@ -40,6 +40,7 @@ COBJS-$(CONFIG_RTC_DS1556) += ds1556.o
 COBJS-$(CONFIG_RTC_DS164x) += ds164x.o
 COBJS-$(CONFIG_RTC_DS174x) += ds174x.o
 COBJS-$(CONFIG_RTC_DS3231) += ds3231.o
+COBJS-$(CONFIG_RTC_FTRTC010) += ftrtc010.o
 COBJS-$(CONFIG_RTC_ISL1208) += isl1208.o
 COBJS-$(CONFIG_RTC_M41T11) += m41t11.o
 COBJS-$(CONFIG_RTC_M41T60) += m41t60.o

drivers/rtc/ftrtc010.c

+/*
+ * Faraday FTRTC010 Real Time Clock
+ *
+ * (C) Copyright 2009 Faraday Technology
+ * Po-Yu Chuang <ratbert@faraday-tech.com>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+#include <common.h>
+#include <rtc.h>
+#include <asm/io.h>
+
+struct ftrtc010 {
+	unsigned int sec;		/* 0x00 */
+	unsigned int min;		/* 0x04 */
+	unsigned int hour;		/* 0x08 */
+	unsigned int day;		/* 0x0c */
+	unsigned int alarm_sec;		/* 0x10 */
+	unsigned int alarm_min;		/* 0x14 */
+	unsigned int alarm_hour;	/* 0x18 */
+	unsigned int record;		/* 0x1c */
+	unsigned int cr;		/* 0x20 */
+};
+
+/*
+ * RTC Control Register
+ */
+#define FTRTC010_CR_ENABLE		(1 << 0)
+#define FTRTC010_CR_INTERRUPT_SEC	(1 << 1)	/* per second irq */
+#define FTRTC010_CR_INTERRUPT_MIN	(1 << 2)	/* per minute irq */
+#define FTRTC010_CR_INTERRUPT_HR	(1 << 3)	/* per hour   irq */
+#define FTRTC010_CR_INTERRUPT_DAY	(1 << 4)	/* per day    irq */
+
+static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
+
+static void ftrtc010_enable(void)
+{
+	writel(FTRTC010_CR_ENABLE, &rtc->cr);
+}
+
+/*
+ * return current time in seconds
+ */
+static unsigned long ftrtc010_time(void)
+{
+	unsigned long day;
+	unsigned long hour;
+	unsigned long minute;
+	unsigned long second;
+	unsigned long second2;
+
+	do {
+		second	= readl(&rtc->sec);
+		day	= readl(&rtc->day);
+		hour	= readl(&rtc->hour);
+		minute	= readl(&rtc->min);
+		second2	= readl(&rtc->sec);
+	} while (second != second2);
+
+	return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
+}
+
+/*
+ * Get the current time from the RTC
+ */
+
+int rtc_get(struct rtc_time *tmp)
+{
+	unsigned long now;
+
+	debug("%s(): record register: %x\n",
+	      __func__, readl(&rtc->record));
+
+	now = ftrtc010_time() + readl(&rtc->record);
+
+	to_tm(now, tmp);
+
+	return 0;
+}
+
+/*
+ * Set the RTC
+ */
+int rtc_set(struct rtc_time *tmp)
+{
+	unsigned long new;
+	unsigned long now;
+
+	debug("%s(): DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+	      __func__,
+	      tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+	      tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+	new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
+		     tmp->tm_min, tmp->tm_sec);
+
+	now = ftrtc010_time();
+
+	debug("%s(): write %lx to record register\n", __func__, new - now);
+
+	writel(new - now, &rtc->record);
+
+	return 0;
+}
+
+void rtc_reset(void)
+{
+	debug("%s()\n", __func__);
+	ftrtc010_enable();
+}