1 /* 2 * (C) Copyright 2001 3 * Denis Peter MPL AG Switzerland. d.peter@mpl.ch 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * Date & Time support for the MC146818 (PIXX4) RTC 10 */ 11 12 /*#define DEBUG*/ 13 14 #include <common.h> 15 #include <command.h> 16 #include <rtc.h> 17 18 #if defined(__I386__) || defined(CONFIG_MALTA) 19 #include <asm/io.h> 20 #define in8(p) inb(p) 21 #define out8(p, v) outb(v, p) 22 #endif 23 24 #if defined(CONFIG_CMD_DATE) 25 26 static uchar rtc_read (uchar reg); 27 static void rtc_write (uchar reg, uchar val); 28 29 #define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70 30 #define RTC_SECONDS 0x00 31 #define RTC_SECONDS_ALARM 0x01 32 #define RTC_MINUTES 0x02 33 #define RTC_MINUTES_ALARM 0x03 34 #define RTC_HOURS 0x04 35 #define RTC_HOURS_ALARM 0x05 36 #define RTC_DAY_OF_WEEK 0x06 37 #define RTC_DATE_OF_MONTH 0x07 38 #define RTC_MONTH 0x08 39 #define RTC_YEAR 0x09 40 #define RTC_CONFIG_A 0x0A 41 #define RTC_CONFIG_B 0x0B 42 #define RTC_CONFIG_C 0x0C 43 #define RTC_CONFIG_D 0x0D 44 45 46 /* ------------------------------------------------------------------------- */ 47 48 int rtc_get (struct rtc_time *tmp) 49 { 50 uchar sec, min, hour, mday, wday, mon, year; 51 /* here check if rtc can be accessed */ 52 while((rtc_read(RTC_CONFIG_A)&0x80)==0x80); 53 sec = rtc_read (RTC_SECONDS); 54 min = rtc_read (RTC_MINUTES); 55 hour = rtc_read (RTC_HOURS); 56 mday = rtc_read (RTC_DATE_OF_MONTH); 57 wday = rtc_read (RTC_DAY_OF_WEEK); 58 mon = rtc_read (RTC_MONTH); 59 year = rtc_read (RTC_YEAR); 60 #ifdef RTC_DEBUG 61 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 62 "hr: %02x min: %02x sec: %02x\n", 63 year, mon, mday, wday, 64 hour, min, sec ); 65 printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n", 66 rtc_read (RTC_CONFIG_D) & 0x3F, 67 rtc_read (RTC_HOURS_ALARM), 68 rtc_read (RTC_MINUTES_ALARM), 69 rtc_read (RTC_SECONDS_ALARM) ); 70 #endif 71 tmp->tm_sec = bcd2bin (sec & 0x7F); 72 tmp->tm_min = bcd2bin (min & 0x7F); 73 tmp->tm_hour = bcd2bin (hour & 0x3F); 74 tmp->tm_mday = bcd2bin (mday & 0x3F); 75 tmp->tm_mon = bcd2bin (mon & 0x1F); 76 tmp->tm_year = bcd2bin (year); 77 tmp->tm_wday = bcd2bin (wday & 0x07); 78 if(tmp->tm_year<70) 79 tmp->tm_year+=2000; 80 else 81 tmp->tm_year+=1900; 82 tmp->tm_yday = 0; 83 tmp->tm_isdst= 0; 84 #ifdef RTC_DEBUG 85 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 86 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 87 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 88 #endif 89 90 return 0; 91 } 92 93 int rtc_set (struct rtc_time *tmp) 94 { 95 #ifdef RTC_DEBUG 96 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 97 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 98 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 99 #endif 100 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 101 102 rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100)); 103 rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon)); 104 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)); 105 rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday)); 106 rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour)); 107 rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min )); 108 rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec )); 109 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 110 111 return 0; 112 } 113 114 void rtc_reset (void) 115 { 116 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ 117 rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */ 118 rtc_write(RTC_CONFIG_B,0x00); 119 rtc_write(RTC_CONFIG_B,0x00); 120 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ 121 } 122 123 /* ------------------------------------------------------------------------- */ 124 125 #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR 126 /* 127 * use direct memory access 128 */ 129 static uchar rtc_read (uchar reg) 130 { 131 return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg)); 132 } 133 134 static void rtc_write (uchar reg, uchar val) 135 { 136 out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val); 137 } 138 #else 139 static uchar rtc_read (uchar reg) 140 { 141 out8(RTC_PORT_MC146818,reg); 142 return(in8(RTC_PORT_MC146818+1)); 143 } 144 145 static void rtc_write (uchar reg, uchar val) 146 { 147 out8(RTC_PORT_MC146818,reg); 148 out8(RTC_PORT_MC146818+1,val); 149 } 150 #endif 151 152 #endif 153