RTC driver for PT7C4338 chip.

PT7C4338 chip is being manufactured by Pericom Technology Inc.
It is a serial real-time clock which provides:
1)Low-power clock/calendar.
2)Programmable square-wave output.
It has 56 bytes of nonvolatile RAM.

Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
Acked-by: Timur Tabi <timur@freescale.com>

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index f810fca0907b33bc40846dff5bb7ae60fc556366..916d73f9f01ceda9a8746884a2fceb45a45aa770 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -57,6 +57,7 @@ COBJS-$(CONFIG_RTC_MPC5200) += mpc5xxx.o
 COBJS-$(CONFIG_RTC_MPC8xx) += mpc8xx.o
 COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o
 COBJS-$(CONFIG_RTC_PL031) += pl031.o
+COBJS-$(CONFIG_RTC_PT7C4338) += pt7c4338.o
 COBJS-$(CONFIG_RTC_RS5C372A) += rs5c372.o
 COBJS-$(CONFIG_RTC_RTC4543) += rtc4543.o
 COBJS-$(CONFIG_RTC_RX8025) += rx8025.o

diff --git a/drivers/rtc/pt7c4338.c b/drivers/rtc/pt7c4338.c
new file mode 100644 (file)
index 0000000..26e2c1e
--- /dev/null
+++ b/drivers/rtc/pt7c4338.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2010 Freescale Semiconductor, Inc.
+ *
+ * Author:     Priyanka Jain <Priyanka.Jain@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
+ */
+
+/*
+ * This file provides Date & Time support (no alarms) for PT7C4338 chip.
+ *
+ * This file is based on drivers/rtc/ds1337.c
+ *
+ * PT7C4338 chip is manufactured by Pericom Technology Inc.
+ * It is a serial real-time clock which provides
+ * 1)Low-power clock/calendar.
+ * 2)Programmable square-wave output.
+ * It has 56 bytes of nonvolatile RAM.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+#include <i2c.h>
+
+/* RTC register addresses */
+#define RTC_SEC_REG_ADDR        0x0
+#define RTC_MIN_REG_ADDR        0x1
+#define RTC_HR_REG_ADDR         0x2
+#define RTC_DAY_REG_ADDR        0x3
+#define RTC_DATE_REG_ADDR       0x4
+#define RTC_MON_REG_ADDR        0x5
+#define RTC_YR_REG_ADDR         0x6
+#define RTC_CTL_STAT_REG_ADDR   0x7
+
+/* RTC second register address bit */
+#define RTC_SEC_BIT_CH         0x80    /* Clock Halt (in Register 0) */
+
+/* RTC control and status register bits */
+#define RTC_CTL_STAT_BIT_RS0    0x1    /* Rate select 0 */
+#define RTC_CTL_STAT_BIT_RS1    0x2    /* Rate select 1 */
+#define RTC_CTL_STAT_BIT_SQWE   0x10   /* Square Wave Enable */
+#define RTC_CTL_STAT_BIT_OSF    0x20   /* Oscillator Stop Flag */
+#define RTC_CTL_STAT_BIT_OUT    0x80   /* Output Level Control */
+
+/* RTC reset value */
+#define RTC_PT7C4338_RESET_VAL \
+       (RTC_CTL_STAT_BIT_RS0 | RTC_CTL_STAT_BIT_RS1 | RTC_CTL_STAT_BIT_OUT)
+
+/****** Helper functions ****************************************/
+static u8 rtc_read(u8 reg)
+{
+       return i2c_reg_read(CONFIG_SYS_I2C_RTC_ADDR, reg);
+}
+
+static void rtc_write(u8 reg, u8 val)
+{
+       i2c_reg_write(CONFIG_SYS_I2C_RTC_ADDR, reg, val);
+}
+/****************************************************************/
+
+/* Get the current time from the RTC */
+int rtc_get(struct rtc_time *tmp)
+{
+       int ret = 0;
+       u8 sec, min, hour, mday, wday, mon, year, ctl_stat;
+
+       ctl_stat = rtc_read(RTC_CTL_STAT_REG_ADDR);
+       sec = rtc_read(RTC_SEC_REG_ADDR);
+       min = rtc_read(RTC_MIN_REG_ADDR);
+       hour = rtc_read(RTC_HR_REG_ADDR);
+       wday = rtc_read(RTC_DAY_REG_ADDR);
+       mday = rtc_read(RTC_DATE_REG_ADDR);
+       mon = rtc_read(RTC_MON_REG_ADDR);
+       year = rtc_read(RTC_YR_REG_ADDR);
+       debug("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
+               "hr: %02x min: %02x sec: %02x control_status: %02x\n",
+               year, mon, mday, wday, hour, min, sec, ctl_stat);
+
+       if (ctl_stat & RTC_CTL_STAT_BIT_OSF) {
+               printf("### Warning: RTC oscillator has stopped\n");
+               /* clear the OSF flag */
+               rtc_write(RTC_CTL_STAT_REG_ADDR,
+                       rtc_read(RTC_CTL_STAT_REG_ADDR)\
+                       & ~RTC_CTL_STAT_BIT_OSF);
+               ret = -1;
+       }
+
+       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 & 0x1F);
+       tmp->tm_year = bcd2bin(year) + 2000;
+       tmp->tm_wday = bcd2bin((wday - 1) & 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 ret;
+}
+
+/* Set the RTC */
+int rtc_set(struct rtc_time *tmp)
+{
+       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);
+
+       rtc_write(RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100));
+       rtc_write(RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon));
+       rtc_write(RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1));
+       rtc_write(RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday));
+       rtc_write(RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour));
+       rtc_write(RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min));
+       rtc_write(RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec));
+
+       return 0;
+}
+
+/* Reset the RTC */
+void rtc_reset(void)
+{
+       rtc_write(RTC_SEC_REG_ADDR, 0x00);      /* clearing Clock Halt  */
+       rtc_write(RTC_CTL_STAT_REG_ADDR, RTC_PT7C4338_RESET_VAL);
+}