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>

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index ea7d899ea9c66e1cbc55f039562950cdfe6fcbb7..772a49a9021a41d46ef6c7aaf474be7a4f70553b 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/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

diff --git a/drivers/rtc/ftrtc010.c b/drivers/rtc/ftrtc010.c
new file mode 100644 (file)
index 0000000..7738a7a
--- /dev/null
+++ b/drivers/rtc/ftrtc010.c
@@ -0,0 +1,124 @@
+/*
+ * 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();
+}