/* * (C) Copyright 2001 * Denis Peter MPL AG Switzerland. d.peter@mpl.ch * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * Date & Time support for the MC146818 (PIXX4) RTC */ /*#define DEBUG*/ #include <common.h> #include <command.h> #include <rtc.h> #if defined(CONFIG_CMD_DATE) static uchar rtc_read (uchar reg); static void rtc_write (uchar reg, uchar val); static uchar bin2bcd (unsigned int n); static unsigned bcd2bin(uchar c); #define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70 #define RTC_SECONDS 0x00 #define RTC_SECONDS_ALARM 0x01 #define RTC_MINUTES 0x02 #define RTC_MINUTES_ALARM 0x03 #define RTC_HOURS 0x04 #define RTC_HOURS_ALARM 0x05 #define RTC_DAY_OF_WEEK 0x06 #define RTC_DATE_OF_MONTH 0x07 #define RTC_MONTH 0x08 #define RTC_YEAR 0x09 #define RTC_CONFIG_A 0x0A #define RTC_CONFIG_B 0x0B #define RTC_CONFIG_C 0x0C #define RTC_CONFIG_D 0x0D /* ------------------------------------------------------------------------- */ int rtc_get (struct rtc_time *tmp) { uchar sec, min, hour, mday, wday, mon, year; /* here check if rtc can be accessed */ while((rtc_read(RTC_CONFIG_A)&0x80)==0x80); sec = rtc_read (RTC_SECONDS); min = rtc_read (RTC_MINUTES); hour = rtc_read (RTC_HOURS); mday = rtc_read (RTC_DATE_OF_MONTH); wday = rtc_read (RTC_DAY_OF_WEEK); mon = rtc_read (RTC_MONTH); year = rtc_read (RTC_YEAR); #ifdef CONFIG_AMIGAONEG3SE wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */ #endif #ifdef RTC_DEBUG printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " "hr: %02x min: %02x sec: %02x\n", year, mon, mday, wday, hour, min, sec ); printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n", rtc_read (RTC_CONFIG_D) & 0x3F, rtc_read (RTC_HOURS_ALARM), rtc_read (RTC_MINUTES_ALARM), rtc_read (RTC_SECONDS_ALARM) ); #endif tmp->tm_sec = bcd2bin (sec & 0x7F); tmp->tm_min = bcd2bin (min & 0x7F); tmp->tm_hour = bcd2bin (hour & 0x3F); tmp->tm_mday = bcd2bin (mday & 0x3F); tmp->tm_mon = bcd2bin (mon & 0x1F); tmp->tm_year = bcd2bin (year); tmp->tm_wday = bcd2bin (wday & 0x07); if(tmp->tm_year<70) tmp->tm_year+=2000; else tmp->tm_year+=1900; tmp->tm_yday = 0; tmp->tm_isdst= 0; #ifdef RTC_DEBUG printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); #endif return 0; } int rtc_set (struct rtc_time *tmp) { #ifdef RTC_DEBUG printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); #endif rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100)); rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon)); #ifdef CONFIG_AMIGAONEG3SE rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1); #else rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)); #endif rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday)); rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour)); rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min )); rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec )); rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ return 0; } void rtc_reset (void) { rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */ rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */ rtc_write(RTC_CONFIG_B,0x00); rtc_write(RTC_CONFIG_B,0x00); rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */ } /* ------------------------------------------------------------------------- */ #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR /* * use direct memory access */ static uchar rtc_read (uchar reg) { return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg)); } static void rtc_write (uchar reg, uchar val) { out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val); } #else static uchar rtc_read (uchar reg) { out8(RTC_PORT_MC146818,reg); return(in8(RTC_PORT_MC146818+1)); } static void rtc_write (uchar reg, uchar val) { out8(RTC_PORT_MC146818,reg); out8(RTC_PORT_MC146818+1,val); } #endif static unsigned bcd2bin (uchar n) { return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); } static unsigned char bin2bcd (unsigned int n) { return (((n / 10) << 4) | (n % 10)); } #endif