1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2001 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 */ 6 7 /* 8 * Date & Time support for Philips PCF8563 RTC 9 */ 10 11 /* #define DEBUG */ 12 13 #include <common.h> 14 #include <command.h> 15 #include <rtc.h> 16 #include <i2c.h> 17 18 static uchar rtc_read (uchar reg); 19 static void rtc_write (uchar reg, uchar val); 20 21 /* ------------------------------------------------------------------------- */ 22 23 int rtc_get (struct rtc_time *tmp) 24 { 25 int rel = 0; 26 uchar sec, min, hour, mday, wday, mon_cent, year; 27 28 sec = rtc_read (0x02); 29 min = rtc_read (0x03); 30 hour = rtc_read (0x04); 31 mday = rtc_read (0x05); 32 wday = rtc_read (0x06); 33 mon_cent= rtc_read (0x07); 34 year = rtc_read (0x08); 35 36 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 37 "hr: %02x min: %02x sec: %02x\n", 38 year, mon_cent, mday, wday, 39 hour, min, sec ); 40 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n", 41 rtc_read (0x0C), 42 rtc_read (0x0B), 43 rtc_read (0x0A), 44 rtc_read (0x09) ); 45 46 if (sec & 0x80) { 47 puts ("### Warning: RTC Low Voltage - date/time not reliable\n"); 48 rel = -1; 49 } 50 51 tmp->tm_sec = bcd2bin (sec & 0x7F); 52 tmp->tm_min = bcd2bin (min & 0x7F); 53 tmp->tm_hour = bcd2bin (hour & 0x3F); 54 tmp->tm_mday = bcd2bin (mday & 0x3F); 55 tmp->tm_mon = bcd2bin (mon_cent & 0x1F); 56 tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000); 57 tmp->tm_wday = bcd2bin (wday & 0x07); 58 tmp->tm_yday = 0; 59 tmp->tm_isdst= 0; 60 61 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 62 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 63 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 64 65 return rel; 66 } 67 68 int rtc_set (struct rtc_time *tmp) 69 { 70 uchar century; 71 72 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 73 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 74 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 75 76 rtc_write (0x08, bin2bcd(tmp->tm_year % 100)); 77 78 century = (tmp->tm_year >= 2000) ? 0 : 0x80; 79 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century); 80 81 rtc_write (0x06, bin2bcd(tmp->tm_wday)); 82 rtc_write (0x05, bin2bcd(tmp->tm_mday)); 83 rtc_write (0x04, bin2bcd(tmp->tm_hour)); 84 rtc_write (0x03, bin2bcd(tmp->tm_min )); 85 rtc_write (0x02, bin2bcd(tmp->tm_sec )); 86 87 return 0; 88 } 89 90 void rtc_reset (void) 91 { 92 /* clear all control & status registers */ 93 rtc_write (0x00, 0x00); 94 rtc_write (0x01, 0x00); 95 rtc_write (0x0D, 0x00); 96 97 /* clear Voltage Low bit */ 98 rtc_write (0x02, rtc_read (0x02) & 0x7F); 99 100 /* reset all alarms */ 101 rtc_write (0x09, 0x00); 102 rtc_write (0x0A, 0x00); 103 rtc_write (0x0B, 0x00); 104 rtc_write (0x0C, 0x00); 105 } 106 107 /* ------------------------------------------------------------------------- */ 108 109 static uchar rtc_read (uchar reg) 110 { 111 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg)); 112 } 113 114 static void rtc_write (uchar reg, uchar val) 115 { 116 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); 117 } 118