1 /* 2 * Copyright (C) 2016 by NXP Semiconductors Inc. 3 * Date & Time support for PCF2127 RTC 4 */ 5 6 /* #define DEBUG */ 7 8 #include <common.h> 9 #include <command.h> 10 #include <dm.h> 11 #include <i2c.h> 12 #include <rtc.h> 13 14 #define PCF2127_REG_CTRL1 0x00 15 #define PCF2127_REG_CTRL2 0x01 16 #define PCF2127_REG_CTRL3 0x02 17 #define PCF2127_REG_SC 0x03 18 #define PCF2127_REG_MN 0x04 19 #define PCF2127_REG_HR 0x05 20 #define PCF2127_REG_DM 0x06 21 #define PCF2127_REG_DW 0x07 22 #define PCF2127_REG_MO 0x08 23 #define PCF2127_REG_YR 0x09 24 25 static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm) 26 { 27 uchar buf[8]; 28 int i = 0, ret; 29 30 /* start register address */ 31 buf[i++] = PCF2127_REG_SC; 32 33 /* hours, minutes and seconds */ 34 buf[i++] = bin2bcd(tm->tm_sec); 35 buf[i++] = bin2bcd(tm->tm_min); 36 buf[i++] = bin2bcd(tm->tm_hour); 37 buf[i++] = bin2bcd(tm->tm_mday); 38 buf[i++] = tm->tm_wday & 0x07; 39 40 /* month, 1 - 12 */ 41 buf[i++] = bin2bcd(tm->tm_mon + 1); 42 43 /* year */ 44 buf[i++] = bin2bcd(tm->tm_year % 100); 45 46 /* write register's data */ 47 ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)); 48 49 return ret; 50 } 51 52 static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm) 53 { 54 int ret = 0; 55 uchar buf[10] = { PCF2127_REG_CTRL1 }; 56 57 ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1); 58 if (ret < 0) 59 return ret; 60 ret = dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)); 61 if (ret < 0) 62 return ret; 63 64 if (buf[PCF2127_REG_CTRL3] & 0x04) 65 puts("### Warning: RTC Low Voltage - date/time not reliable\n"); 66 67 tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F); 68 tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F); 69 tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F); 70 tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F); 71 tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1; 72 tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900; 73 if (tm->tm_year < 1970) 74 tm->tm_year += 100; /* assume we are in 1970...2069 */ 75 tm->tm_wday = buf[PCF2127_REG_DW] & 0x07; 76 tm->tm_yday = 0; 77 tm->tm_isdst = 0; 78 79 debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 80 tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, 81 tm->tm_hour, tm->tm_min, tm->tm_sec); 82 83 return ret; 84 } 85 86 static int pcf2127_rtc_reset(struct udevice *dev) 87 { 88 /*Doing nothing here*/ 89 90 return 0; 91 } 92 93 static const struct rtc_ops pcf2127_rtc_ops = { 94 .get = pcf2127_rtc_get, 95 .set = pcf2127_rtc_set, 96 .reset = pcf2127_rtc_reset, 97 }; 98 99 static const struct udevice_id pcf2127_rtc_ids[] = { 100 { .compatible = "pcf2127-rtc" }, 101 { } 102 }; 103 104 U_BOOT_DRIVER(rtc_pcf2127) = { 105 .name = "rtc-pcf2127", 106 .id = UCLASS_RTC, 107 .of_match = pcf2127_rtc_ids, 108 .ops = &pcf2127_rtc_ops, 109 }; 110