rtc/mk48t59.c

   1 /*
   2  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   3  * Andreas Heppel <aheppel@sysgo.de>
   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 MK48T59 RTC
  26  */
  27
  28 #undef  RTC_DEBUG
  29
  30 #include <common.h>
  31 #include <command.h>
  32 #include <config.h>
  33 #include <rtc.h>
  34 #include <mk48t59.h>
  35
  36 #if defined(CONFIG_RTC_MK48T59)
  37
  38 #if defined(CONFIG_BAB7xx)
  39
  40 static uchar rtc_read (short reg)
  41 {
  42         out8(RTC_PORT_ADDR0, reg & 0xFF);
  43         out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
  44         return in8(RTC_PORT_DATA);
  45 }
  46
  47 static void rtc_write (short reg, uchar val)
  48 {
  49         out8(RTC_PORT_ADDR0, reg & 0xFF);
  50         out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
  51         out8(RTC_PORT_DATA, val);
  52 }
  53
  54 #elif defined(CONFIG_PCIPPC2)
  55
  56 #include "../board/pcippc2/pcippc2.h"
  57
  58 static uchar rtc_read (short reg)
  59 {
  60         return in8(RTC(reg));
  61 }
  62
  63 static void rtc_write (short reg, uchar val)
  64 {
  65         out8(RTC(reg),val);
  66 }
  67
  68 #elif defined(CONFIG_AMIGAONEG3SE)
  69
  70 #include "../board/MAI/AmigaOneG3SE/via686.h"
  71 #include "../board/MAI/AmigaOneG3SE/memio.h"
  72
  73
  74 static uchar rtc_read (short reg)
  75 {
  76     out_byte(CMOS_ADDR, (uint8)reg);
  77     return in_byte(CMOS_DATA);
  78 }
  79
  80 static void rtc_write (short reg, uchar val)
  81 {
  82     out_byte(CMOS_ADDR, (uint8)reg);
  83     out_byte(CMOS_DATA, (uint8)val);
  84 }
  85
  86 #else
  87 # error Board specific rtc access functions should be supplied
  88 #endif
  89
  90 static unsigned bcd2bin (uchar n)
  91 {
  92         return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
  93 }
  94
  95 static unsigned char bin2bcd (unsigned int n)
  96 {
  97         return (((n / 10) << 4) | (n % 10));
  98 }
  99
 100 /* ------------------------------------------------------------------------- */
 101
 102 void *nvram_read(void *dest, const short src, size_t count)
 103 {
 104         uchar *d = (uchar *) dest;
 105         short s = src;
 106
 107         while (count--)
 108                 *d++ = rtc_read(s++);
 109
 110         return dest;
 111 }
 112
 113 void nvram_write(short dest, const void *src, size_t count)
 114 {
 115         short d = dest;
 116         uchar *s = (uchar *) src;
 117
 118         while (count--)
 119                 rtc_write(d++, *s++);
 120 }
 121
 122 #if (CONFIG_COMMANDS & CFG_CMD_DATE)
 123
 124 /* ------------------------------------------------------------------------- */
 125
 126 void rtc_get (struct rtc_time *tmp)
 127 {
 128         uchar save_ctrl_a;
 129         uchar sec, min, hour, mday, wday, mon, year;
 130
 131         /* Simple: freeze the clock, read it and allow updates again */
 132         save_ctrl_a = rtc_read(RTC_CONTROLA);
 133
 134         /* Set the register to read the value. */
 135         save_ctrl_a |= RTC_CA_READ;
 136         rtc_write(RTC_CONTROLA, save_ctrl_a);
 137
 138         sec             = rtc_read (RTC_SECONDS);
 139         min             = rtc_read (RTC_MINUTES);
 140         hour    = rtc_read (RTC_HOURS);
 141         mday    = rtc_read (RTC_DAY_OF_MONTH);
 142         wday    = rtc_read (RTC_DAY_OF_WEEK);
 143         mon             = rtc_read (RTC_MONTH);
 144         year    = rtc_read (RTC_YEAR);
 145
 146         /* re-enable update */
 147         save_ctrl_a &= ~RTC_CA_READ;
 148         rtc_write(RTC_CONTROLA, save_ctrl_a);
 149
 150 #ifdef RTC_DEBUG
 151         printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
 152                 "hr: %02x min: %02x sec: %02x\n",
 153                 year, mon, mday, wday,
 154                 hour, min, sec );
 155 #endif
 156         tmp->tm_sec  = bcd2bin (sec  & 0x7F);
 157         tmp->tm_min  = bcd2bin (min  & 0x7F);
 158         tmp->tm_hour = bcd2bin (hour & 0x3F);
 159         tmp->tm_mday = bcd2bin (mday & 0x3F);
 160         tmp->tm_mon  = bcd2bin (mon & 0x1F);
 161         tmp->tm_year = bcd2bin (year);
 162         tmp->tm_wday = bcd2bin (wday & 0x07);
 163         if(tmp->tm_year<70)
 164                 tmp->tm_year+=2000;
 165         else
 166                 tmp->tm_year+=1900;
 167         tmp->tm_yday = 0;
 168         tmp->tm_isdst= 0;
 169 #ifdef RTC_DEBUG
 170         printf ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 171                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 172                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 173 #endif
 174 }
 175
 176 void rtc_set (struct rtc_time *tmp)
 177 {
 178         uchar save_ctrl_a;
 179
 180 #ifdef RTC_DEBUG
 181         printf ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 182                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 183                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 184 #endif
 185         save_ctrl_a = rtc_read(RTC_CONTROLA);
 186
 187         save_ctrl_a |= RTC_CA_WRITE;
 188         rtc_write(RTC_CONTROLA, save_ctrl_a); /* disables the RTC to update the regs */
 189
 190         rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
 191         rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
 192
 193         rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
 194         rtc_write (RTC_DAY_OF_MONTH, bin2bcd(tmp->tm_mday));
 195         rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
 196         rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
 197         rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
 198
 199         save_ctrl_a &= ~RTC_CA_WRITE;
 200         rtc_write(RTC_CONTROLA, save_ctrl_a); /* enables the RTC to update the regs */
 201 }
 202
 203 void rtc_reset (void)
 204 {
 205         uchar control_b;
 206
 207         /*
 208          * Start oscillator here.
 209          */
 210         control_b = rtc_read(RTC_CONTROLB);
 211
 212         control_b &= ~RTC_CB_STOP;
 213         rtc_write(RTC_CONTROLB, control_b);
 214 }
 215
 216 void rtc_set_watchdog(short multi, short res)
 217 {
 218         uchar wd_value;
 219
 220         wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3);
 221         rtc_write(RTC_WATCHDOG, wd_value);
 222 }
 223
 224 #endif  /* (CONFIG_COMMANDS & CFG_CMD_DATE) */
 225 #endif  /* CONFIG_RTC_MK48T59 */