rtc: Add RTC chip pcf2127 support

This driver compatible with pcf2127 and pcf2129

Signed-off-by: Meng Yi <meng.yi@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b5d9048ad6a54424ba2b898219bece4191fbf8d4..57af1b56cbf665ae968706a1bee284956697d9d4 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -13,4 +13,10 @@ config DM_RTC
          drivers to perform the actual functions. See rtc.h for a
          description of the API.
 
+config RTC_PCF2127
+       bool "Enable PCF2127 driver"
+       depends on DM_RTC
+       help
+         Enable pcf2127 driver which provides rtc get and set function
+
 endmenu

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index fc38a3f3098a60f114dd05dd1b4043886adf2faf..c9194270851da8ac97e2f5185eee3366e4f7499c 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_RTC_MV) += mvrtc.o
 obj-$(CONFIG_RTC_MX27) += mx27rtc.o
 obj-$(CONFIG_RTC_MXS) += mxsrtc.o
 obj-$(CONFIG_RTC_PCF8563) += pcf8563.o
+obj-$(CONFIG_RTC_PCF2127) += pcf2127.o
 obj-$(CONFIG_RTC_PL031) += pl031.o
 obj-$(CONFIG_RTC_PT7C4338) += pt7c4338.o
 obj-$(CONFIG_RTC_RS5C372A) += rs5c372.o

diff --git a/drivers/rtc/pcf2127.c b/drivers/rtc/pcf2127.c
new file mode 100644 (file)
index 0000000..bc59c6c
--- /dev/null
+++ b/drivers/rtc/pcf2127.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2016 by NXP Semiconductors Inc.
+ * Date & Time support for PCF2127 RTC
+ */
+
+/*     #define DEBUG   */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <i2c.h>
+#include <rtc.h>
+
+#define PCF2127_REG_CTRL1      (0x00)
+#define PCF2127_REG_CTRL2      (0x01)
+#define PCF2127_REG_CTRL3      (0x02)
+#define PCF2127_REG_SC         (0x03)  /* datetime */
+#define PCF2127_REG_MN         (0x04)
+#define PCF2127_REG_HR         (0x05)
+#define PCF2127_REG_DM         (0x06)
+#define PCF2127_REG_DW         (0x07)
+#define PCF2127_REG_MO         (0x08)
+#define PCF2127_REG_YR         (0x09)
+
+static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
+{
+       uchar buf[8];
+       int i = 0;
+
+       /* start register address */
+       buf[i++] = PCF2127_REG_SC;
+
+       /* hours, minutes and seconds */
+       buf[i++] = bin2bcd(tm->tm_sec);
+       buf[i++] = bin2bcd(tm->tm_min);
+       buf[i++] = bin2bcd(tm->tm_hour);
+       buf[i++] = bin2bcd(tm->tm_mday);
+       buf[i++] = tm->tm_wday & 0x07;
+
+       /* month, 1 - 12 */
+       buf[i++] = bin2bcd(tm->tm_mon + 1);
+
+       /* year */
+       buf[i++] = bin2bcd(tm->tm_year % 100);
+
+       /* write register's data */
+       if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0)
+               return -1;
+
+       return 0;
+}
+
+static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
+{
+       int rel = 0;
+       uchar buf[10] = { PCF2127_REG_CTRL1 };
+
+       if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1) < 0)
+               return -1;
+       if (dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0)
+               return -1;
+
+       if (buf[PCF2127_REG_CTRL3] & 0x04)
+               puts("### Warning: RTC Low Voltage - date/time not reliable\n");
+
+       tm->tm_sec  = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
+       tm->tm_min  = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
+       tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
+       tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
+       tm->tm_mon  = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1;
+       tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
+       if (tm->tm_year < 1970)
+               tm->tm_year += 100;     /* assume we are in 1970...2069 */
+       tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
+       tm->tm_yday = 0;
+       tm->tm_isdst = 0;
+
+       debug("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+             tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+             tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+       return rel;
+}
+
+static int pcf2127_rtc_reset(struct udevice *dev)
+{
+       /*Doing nothing here*/
+       return 0;
+}
+
+static const struct rtc_ops pcf2127_rtc_ops = {
+       .get = pcf2127_rtc_get,
+       .set = pcf2127_rtc_set,
+       .reset = pcf2127_rtc_reset,
+};
+
+static const struct udevice_id pcf2127_rtc_ids[] = {
+       { .compatible = "pcf2127-rtc" },
+       { }
+};
+
+U_BOOT_DRIVER(rtc_pcf2127) = {
+       .name   = "rtc-pcf2127",
+       .id     = UCLASS_RTC,
+       .of_match = pcf2127_rtc_ids,
+       .ops    = &pcf2127_rtc_ops,
+};