rtc, davinci: add support for davinci internal RTC

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Paulraj Sandeep <s-paulraj@ti.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

drivers/rtc/Makefile

@@ -30,6 +30,7 @@ LIB	= $(obj)librtc.o
 COBJS-$(CONFIG_RTC_AT91SAM9_RTT) += at91sam9_rtt.o
 COBJS-$(CONFIG_RTC_BFIN) += bfin_rtc.o
 COBJS-y += date.o
+COBJS-$(CONFIG_RTC_DAVINCI) += davinci.o
 COBJS-$(CONFIG_RTC_DS12887) += ds12887.o
 COBJS-$(CONFIG_RTC_DS1302) += ds1302.o
 COBJS-$(CONFIG_RTC_DS1306) += ds1306.o

drivers/rtc/davinci.c

+/*
+ * (C) Copyright 2011 DENX Software Engineering GmbH
+ * Heiko Schocher <hs@denx.de>
+ *
+ * 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>
+#include <command.h>
+#include <rtc.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+
+#if defined(CONFIG_CMD_DATE)
+struct davinci_rtc {
+	u_int32_t	second;
+	u_int32_t	minutes;
+	u_int32_t	hours;
+	u_int32_t	day;
+	u_int32_t	month; /* 0x10 */
+	u_int32_t	year;
+	u_int32_t	dotw;
+	u_int32_t	resv1;
+	u_int32_t	alarmsecond; /* 0x20 */
+	u_int32_t	alarmminute;
+	u_int32_t	alarmhour;
+	u_int32_t	alarmday;
+	u_int32_t	alarmmonth; /* 0x30 */
+	u_int32_t	alarmyear;
+	u_int32_t	resv2[2];
+	u_int32_t	ctrl; /* 0x40 */
+	u_int32_t	status;
+	u_int32_t	irq;
+};
+
+#define RTC_STATE_BUSY	0x01
+#define RTC_STATE_RUN	0x02
+
+#define davinci_rtc_base ((struct davinci_rtc *)DAVINCI_RTC_BASE)
+
+int rtc_get(struct rtc_time *tmp)
+{
+	struct davinci_rtc *rtc = davinci_rtc_base;
+	unsigned long sec, min, hour, mday, wday, mon_cent, year;
+	unsigned long status;
+
+	status = readl(&rtc->status);
+	if ((status & RTC_STATE_RUN) != RTC_STATE_RUN) {
+		printf("RTC doesn't run\n");
+		return -1;
+	}
+	if ((status & RTC_STATE_BUSY) == RTC_STATE_BUSY)
+		udelay(20);
+
+	sec	= readl(&rtc->second);
+	min	= readl(&rtc->minutes);
+	hour	= readl(&rtc->hours);
+	mday	= readl(&rtc->day);
+	wday	= readl(&rtc->dotw);
+	mon_cent = readl(&rtc->month);
+	year	= readl(&rtc->year);
+
+	debug("Get RTC year: %02lx mon/cent: %02lx mday: %02lx wday: %02lx "
+		"hr: %02lx min: %02lx sec: %02lx\n",
+		year, mon_cent, mday, wday,
+		hour, min, sec);
+
+	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_cent & 0x1F);
+	tmp->tm_year = bcd2bin(year) + 2000;
+	tmp->tm_wday = bcd2bin(wday & 0x07);
+	tmp->tm_yday = 0;
+	tmp->tm_isdst = 0;
+
+	debug("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);
+
+	return 0;
+}
+
+int rtc_set(struct rtc_time *tmp)
+{
+	struct davinci_rtc *rtc = davinci_rtc_base;
+
+	debug("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);
+	writel(bin2bcd(tmp->tm_year % 100), &rtc->year);
+	writel(bin2bcd(tmp->tm_mon), &rtc->month);
+
+	writel(bin2bcd(tmp->tm_wday), &rtc->dotw);
+	writel(bin2bcd(tmp->tm_mday), &rtc->day);
+	writel(bin2bcd(tmp->tm_hour), &rtc->hours);
+	writel(bin2bcd(tmp->tm_min), &rtc->minutes);
+	writel(bin2bcd(tmp->tm_sec), &rtc->second);
+	return 0;
+}
+
+void rtc_reset(void)
+{
+	struct davinci_rtc *rtc = davinci_rtc_base;
+
+	/* run RTC counter */
+	writel(0x01, &rtc->ctrl);
+}
+#endif