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) /* datetime */ 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; 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 if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0) 48 return -1; 49 50 return 0; 51 } 52 53 static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm) 54 { 55 int rel = 0; 56 uchar buf[10] = { PCF2127_REG_CTRL1 }; 57 58 if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1) < 0) 59 return -1; 60 if (dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0) 61 return -1; 62 63 if (buf[PCF2127_REG_CTRL3] & 0x04) 64 puts("### Warning: RTC Low Voltage - date/time not reliable\n"); 65 66 tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F); 67 tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F); 68 tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F); 69 tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F); 70 tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1; 71 tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900; 72 if (tm->tm_year < 1970) 73 tm->tm_year += 100; /* assume we are in 1970...2069 */ 74 tm->tm_wday = buf[PCF2127_REG_DW] & 0x07; 75 tm->tm_yday = 0; 76 tm->tm_isdst = 0; 77 78 debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 79 tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, 80 tm->tm_hour, tm->tm_min, tm->tm_sec); 81 82 return rel; 83 } 84 85 static int pcf2127_rtc_reset(struct udevice *dev) 86 { 87 /*Doing nothing here*/ 88 return 0; 89 } 90 91 static const struct rtc_ops pcf2127_rtc_ops = { 92 .get = pcf2127_rtc_get, 93 .set = pcf2127_rtc_set, 94 .reset = pcf2127_rtc_reset, 95 }; 96 97 static const struct udevice_id pcf2127_rtc_ids[] = { 98 { .compatible = "pcf2127-rtc" }, 99 { } 100 }; 101 102 U_BOOT_DRIVER(rtc_pcf2127) = { 103 .name = "rtc-pcf2127", 104 .id = UCLASS_RTC, 105 .of_match = pcf2127_rtc_ids, 106 .ops = &pcf2127_rtc_ops, 107 }; 108