drivers/rtc/mc146818.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter MPL AG Switzerland. d.peter@mpl.ch
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * Date & Time support for the MC146818 (PIXX4) RTC
  26  */
  27
  28 /*#define       DEBUG*/
  29
  30 #include <common.h>
  31 #include <command.h>
  32 #include <rtc.h>
  33
  34 #if defined(CONFIG_CMD_DATE)
  35
  36 static uchar rtc_read  (uchar reg);
  37 static void  rtc_write (uchar reg, uchar val);
  38
  39 #define RTC_PORT_MC146818       CONFIG_SYS_ISA_IO_BASE_ADDRESS +  0x70
  40 #define RTC_SECONDS             0x00
  41 #define RTC_SECONDS_ALARM       0x01
  42 #define RTC_MINUTES             0x02
  43 #define RTC_MINUTES_ALARM       0x03
  44 #define RTC_HOURS               0x04
  45 #define RTC_HOURS_ALARM         0x05
  46 #define RTC_DAY_OF_WEEK         0x06
  47 #define RTC_DATE_OF_MONTH       0x07
  48 #define RTC_MONTH               0x08
  49 #define RTC_YEAR                0x09
  50 #define RTC_CONFIG_A            0x0A
  51 #define RTC_CONFIG_B            0x0B
  52 #define RTC_CONFIG_C            0x0C
  53 #define RTC_CONFIG_D            0x0D
  54
  55
  56 /* ------------------------------------------------------------------------- */
  57
  58 int rtc_get (struct rtc_time *tmp)
  59 {
  60         uchar sec, min, hour, mday, wday, mon, year;
  61   /* here check if rtc can be accessed */
  62         while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
  63         sec     = rtc_read (RTC_SECONDS);
  64         min     = rtc_read (RTC_MINUTES);
  65         hour    = rtc_read (RTC_HOURS);
  66         mday    = rtc_read (RTC_DATE_OF_MONTH);
  67         wday    = rtc_read (RTC_DAY_OF_WEEK);
  68         mon     = rtc_read (RTC_MONTH);
  69         year    = rtc_read (RTC_YEAR);
  70 #ifdef CONFIG_AMIGAONEG3SE
  71         wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */
  72 #endif
  73 #ifdef RTC_DEBUG
  74         printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
  75                 "hr: %02x min: %02x sec: %02x\n",
  76                 year, mon, mday, wday,
  77                 hour, min, sec );
  78         printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
  79                 rtc_read (RTC_CONFIG_D) & 0x3F,
  80                 rtc_read (RTC_HOURS_ALARM),
  81                 rtc_read (RTC_MINUTES_ALARM),
  82                 rtc_read (RTC_SECONDS_ALARM) );
  83 #endif
  84         tmp->tm_sec  = bcd2bin (sec  & 0x7F);
  85         tmp->tm_min  = bcd2bin (min  & 0x7F);
  86         tmp->tm_hour = bcd2bin (hour & 0x3F);
  87         tmp->tm_mday = bcd2bin (mday & 0x3F);
  88         tmp->tm_mon  = bcd2bin (mon & 0x1F);
  89         tmp->tm_year = bcd2bin (year);
  90         tmp->tm_wday = bcd2bin (wday & 0x07);
  91         if(tmp->tm_year<70)
  92                 tmp->tm_year+=2000;
  93         else
  94                 tmp->tm_year+=1900;
  95         tmp->tm_yday = 0;
  96         tmp->tm_isdst= 0;
  97 #ifdef RTC_DEBUG
  98         printf ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  99                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 100                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 101 #endif
 102
 103         return 0;
 104 }
 105
 106 int rtc_set (struct rtc_time *tmp)
 107 {
 108 #ifdef RTC_DEBUG
 109         printf ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 110                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 111                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 112 #endif
 113         rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
 114
 115         rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
 116         rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
 117 #ifdef CONFIG_AMIGAONEG3SE
 118         rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1);
 119 #else
 120         rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
 121 #endif
 122         rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
 123         rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
 124         rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
 125         rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
 126         rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
 127
 128         return 0;
 129 }
 130
 131 void rtc_reset (void)
 132 {
 133         rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
 134         rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
 135         rtc_write(RTC_CONFIG_B,0x00);
 136         rtc_write(RTC_CONFIG_B,0x00);
 137         rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
 138 }
 139
 140 /* ------------------------------------------------------------------------- */
 141
 142 #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
 143 /*
 144  * use direct memory access
 145  */
 146 static uchar rtc_read (uchar reg)
 147 {
 148         return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg));
 149 }
 150
 151 static void rtc_write (uchar reg, uchar val)
 152 {
 153         out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val);
 154 }
 155 #else
 156 static uchar rtc_read (uchar reg)
 157 {
 158         out8(RTC_PORT_MC146818,reg);
 159         return(in8(RTC_PORT_MC146818+1));
 160 }
 161
 162 static void rtc_write (uchar reg, uchar val)
 163 {
 164         out8(RTC_PORT_MC146818,reg);
 165         out8(RTC_PORT_MC146818+1,val);
 166 }
 167 #endif
 168
 169 #endif