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 #if defined(CONFIG_CMD_DATE) 19 20 static uchar rtc_read (uchar reg); 21 static void rtc_write (uchar reg, uchar val); 22 23 /* ------------------------------------------------------------------------- */ 24 25 int rtc_get (struct rtc_time *tmp) 26 { 27 int rel = 0; 28 uchar sec, min, hour, mday, wday, mon_cent, year; 29 30 sec = rtc_read (0x02); 31 min = rtc_read (0x03); 32 hour = rtc_read (0x04); 33 mday = rtc_read (0x05); 34 wday = rtc_read (0x06); 35 mon_cent= rtc_read (0x07); 36 year = rtc_read (0x08); 37 38 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 39 "hr: %02x min: %02x sec: %02x\n", 40 year, mon_cent, mday, wday, 41 hour, min, sec ); 42 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n", 43 rtc_read (0x0C), 44 rtc_read (0x0B), 45 rtc_read (0x0A), 46 rtc_read (0x09) ); 47 48 if (sec & 0x80) { 49 puts ("### Warning: RTC Low Voltage - date/time not reliable\n"); 50 rel = -1; 51 } 52 53 tmp->tm_sec = bcd2bin (sec & 0x7F); 54 tmp->tm_min = bcd2bin (min & 0x7F); 55 tmp->tm_hour = bcd2bin (hour & 0x3F); 56 tmp->tm_mday = bcd2bin (mday & 0x3F); 57 tmp->tm_mon = bcd2bin (mon_cent & 0x1F); 58 tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000); 59 tmp->tm_wday = bcd2bin (wday & 0x07); 60 tmp->tm_yday = 0; 61 tmp->tm_isdst= 0; 62 63 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 64 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 65 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 66 67 return rel; 68 } 69 70 int rtc_set (struct rtc_time *tmp) 71 { 72 uchar century; 73 74 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 75 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 76 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 77 78 rtc_write (0x08, bin2bcd(tmp->tm_year % 100)); 79 80 century = (tmp->tm_year >= 2000) ? 0 : 0x80; 81 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century); 82 83 rtc_write (0x06, bin2bcd(tmp->tm_wday)); 84 rtc_write (0x05, bin2bcd(tmp->tm_mday)); 85 rtc_write (0x04, bin2bcd(tmp->tm_hour)); 86 rtc_write (0x03, bin2bcd(tmp->tm_min )); 87 rtc_write (0x02, bin2bcd(tmp->tm_sec )); 88 89 return 0; 90 } 91 92 void rtc_reset (void) 93 { 94 /* clear all control & status registers */ 95 rtc_write (0x00, 0x00); 96 rtc_write (0x01, 0x00); 97 rtc_write (0x0D, 0x00); 98 99 /* clear Voltage Low bit */ 100 rtc_write (0x02, rtc_read (0x02) & 0x7F); 101 102 /* reset all alarms */ 103 rtc_write (0x09, 0x00); 104 rtc_write (0x0A, 0x00); 105 rtc_write (0x0B, 0x00); 106 rtc_write (0x0C, 0x00); 107 } 108 109 /* ------------------------------------------------------------------------- */ 110 111 static uchar rtc_read (uchar reg) 112 { 113 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg)); 114 } 115 116 static void rtc_write (uchar reg, uchar val) 117 { 118 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); 119 } 120 121 #endif 122