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.yi@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, +};