/* * 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, };