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