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/pcf2127.c b/drivers/rtc/pcf2127.c
new file mode 100644
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,
+};