drivers/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 #elif defined(CONFIG_EVAL5200)
  87
  88 static uchar rtc_read (short reg)
  89 {
  90         return in8(RTC(reg));
  91 }
  92
  93 static void rtc_write (short reg, uchar val)
  94 {
  95         out8(RTC(reg),val);
  96 }
  97
  98 #else
  99 # error Board specific rtc access functions should be supplied
 100 #endif
 101
 102 static unsigned bcd2bin (uchar n)
 103 {
 104         return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
 105 }
 106
 107 static unsigned char bin2bcd (unsigned int n)
 108 {
 109         return (((n / 10) << 4) | (n % 10));
 110 }
 111
 112 /* ------------------------------------------------------------------------- */
 113
 114 void *nvram_read(void *dest, const short src, size_t count)
 115 {
 116         uchar *d = (uchar *) dest;
 117         short s = src;
 118
 119         while (count--)
 120                 *d++ = rtc_read(s++);
 121
 122         return dest;
 123 }
 124
 125 void nvram_write(short dest, const void *src, size_t count)
 126 {
 127         short d = dest;
 128         uchar *s = (uchar *) src;
 129
 130         while (count--)
 131                 rtc_write(d++, *s++);
 132 }
 133
 134 #if defined(CONFIG_CMD_DATE)
 135
 136 /* ------------------------------------------------------------------------- */
 137
 138 void rtc_get (struct rtc_time *tmp)
 139 {
 140         uchar save_ctrl_a;
 141         uchar sec, min, hour, mday, wday, mon, year;
 142
 143         /* Simple: freeze the clock, read it and allow updates again */
 144         save_ctrl_a = rtc_read(RTC_CONTROLA);
 145
 146         /* Set the register to read the value. */
 147         save_ctrl_a |= RTC_CA_READ;
 148         rtc_write(RTC_CONTROLA, save_ctrl_a);
 149
 150         sec             = rtc_read (RTC_SECONDS);
 151         min             = rtc_read (RTC_MINUTES);
 152         hour    = rtc_read (RTC_HOURS);
 153         mday    = rtc_read (RTC_DAY_OF_MONTH);
 154         wday    = rtc_read (RTC_DAY_OF_WEEK);
 155         mon             = rtc_read (RTC_MONTH);
 156         year    = rtc_read (RTC_YEAR);
 157
 158         /* re-enable update */
 159         save_ctrl_a &= ~RTC_CA_READ;
 160         rtc_write(RTC_CONTROLA, save_ctrl_a);
 161
 162 #ifdef RTC_DEBUG
 163         printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
 164                 "hr: %02x min: %02x sec: %02x\n",
 165                 year, mon, mday, wday,
 166                 hour, min, sec );
 167 #endif
 168         tmp->tm_sec  = bcd2bin (sec  & 0x7F);
 169         tmp->tm_min  = bcd2bin (min  & 0x7F);
 170         tmp->tm_hour = bcd2bin (hour & 0x3F);
 171         tmp->tm_mday = bcd2bin (mday & 0x3F);
 172         tmp->tm_mon  = bcd2bin (mon & 0x1F);
 173         tmp->tm_year = bcd2bin (year);
 174         tmp->tm_wday = bcd2bin (wday & 0x07);
 175         if(tmp->tm_year<70)
 176                 tmp->tm_year+=2000;
 177         else
 178                 tmp->tm_year+=1900;
 179         tmp->tm_yday = 0;
 180         tmp->tm_isdst= 0;
 181 #ifdef RTC_DEBUG
 182         printf ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 183                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 184                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 185 #endif
 186 }
 187
 188 void rtc_set (struct rtc_time *tmp)
 189 {
 190         uchar save_ctrl_a;
 191
 192 #ifdef RTC_DEBUG
 193         printf ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 194                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 195                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 196 #endif
 197         save_ctrl_a = rtc_read(RTC_CONTROLA);
 198
 199         save_ctrl_a |= RTC_CA_WRITE;
 200         rtc_write(RTC_CONTROLA, save_ctrl_a); /* disables the RTC to update the regs */
 201
 202         rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
 203         rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
 204
 205         rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
 206         rtc_write (RTC_DAY_OF_MONTH, bin2bcd(tmp->tm_mday));
 207         rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
 208         rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
 209         rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
 210
 211         save_ctrl_a &= ~RTC_CA_WRITE;
 212         rtc_write(RTC_CONTROLA, save_ctrl_a); /* enables the RTC to update the regs */
 213 }
 214
 215 void rtc_reset (void)
 216 {
 217         uchar control_b;
 218
 219         /*
 220          * Start oscillator here.
 221          */
 222         control_b = rtc_read(RTC_CONTROLB);
 223
 224         control_b &= ~RTC_CB_STOP;
 225         rtc_write(RTC_CONTROLB, control_b);
 226 }
 227
 228 void rtc_set_watchdog(short multi, short res)
 229 {
 230         uchar wd_value;
 231
 232         wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3);
 233         rtc_write(RTC_WATCHDOG, wd_value);
 234 }
 235
 236 #endif
 237 #endif  /* CONFIG_RTC_MK48T59 */