@@ -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
new file mode 100644
@@ -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);
+}