This driver just implemented rtc_get and rtc_set function for
the compatibility of pcf2127 and pcf2129, and didn't make use
of pcf2127's 512 bytes of general-purpose static RAM since
pcf2129 don't have any static RAM.
Signed-off-by: Meng Yi <meng...@nxp.com>
---
change in V3:
-fix coding style and return value check
change in V2:
-convert to using u-boot driver module
---
drivers/rtc/Kconfig | 10 +++++
drivers/rtc/Makefile | 1 +
drivers/rtc/pcf2127.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 120 insertions(+)
create mode 100644 drivers/rtc/pcf2127.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b5d9048..cb79a01 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -13,4 +13,14 @@ 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
+ The PCF2127 is a CMOS Real Time Clock (RTC) and calendar with an
integrated
+ Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768
kHz quartz
+ crystal optimized for very high accuracy and very low power
consumption. The PCF2127
+ has a selectable I2C-bus or SPI-bus, a backup battery switch-over
circuit, a
+ programmable watchdog function, a timestamp function, and many other
features.
+
endmenu
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index fc38a3f..c919427 100644
--- 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
index 0000000..dcf0340
--- /dev/null
+++ b/drivers/rtc/pcf2127.c
@@ -0,0 +1,109 @@
+/*
+ * 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
+#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, ret;
+
+ /* 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 */
+ ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
+
+ return ret;
+}
+
+static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
+{
+ int ret = 0;
+ uchar buf[10] = { PCF2127_REG_CTRL1 };
+
+ ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1);
+ if (ret < 0)
+ return ret;
+ ret = dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
+ if (ret < 0)
+ return ret;
+
+ 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 ret;
+}
+
+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,
+};
--
2.1.0.27.g96db324
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
