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_BAB7xx)
  37
  38 static uchar rtc_read (short reg)
  39 {
  40         out8(RTC_PORT_ADDR0, reg & 0xFF);
  41         out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
  42         return in8(RTC_PORT_DATA);
  43 }
  44
  45 static void rtc_write (short reg, uchar val)
  46 {
  47         out8(RTC_PORT_ADDR0, reg & 0xFF);
  48         out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
  49         out8(RTC_PORT_DATA, val);
  50 }
  51
  52 #elif defined(CONFIG_PCIPPC2)
  53
  54 #include "../board/pcippc2/pcippc2.h"
  55
  56 static uchar rtc_read (short reg)
  57 {
  58         return in8(RTC(reg));
  59 }
  60
  61 static void rtc_write (short reg, uchar val)
  62 {
  63         out8(RTC(reg),val);
  64 }
  65
  66 #elif defined(CONFIG_AMIGAONEG3SE)
  67
  68 #include "../board/MAI/AmigaOneG3SE/via686.h"
  69 #include "../board/MAI/AmigaOneG3SE/memio.h"
  70
  71
  72 static uchar rtc_read (short reg)
  73 {
  74     out_byte(CMOS_ADDR, (uint8)reg);
  75     return in_byte(CMOS_DATA);
  76 }
  77
  78 static void rtc_write (short reg, uchar val)
  79 {
  80     out_byte(CMOS_ADDR, (uint8)reg);
  81     out_byte(CMOS_DATA, (uint8)val);
  82 }
  83
  84 #elif defined(CONFIG_EVAL5200)
  85
  86 static uchar rtc_read (short reg)
  87 {
  88         return in8(RTC(reg));
  89 }
  90
  91 static void rtc_write (short reg, uchar val)
  92 {
  93         out8(RTC(reg),val);
  94 }
  95
  96 #else
  97 # error Board specific rtc access functions should be supplied
  98 #endif
  99
 100 static unsigned bcd2bin (uchar n)
 101 {
 102         return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
 103 }
 104
 105 static unsigned char bin2bcd (unsigned int n)
 106 {
 107         return (((n / 10) << 4) | (n % 10));
 108 }
 109
 110 /* ------------------------------------------------------------------------- */
 111
 112 void *nvram_read(void *dest, const short src, size_t count)
 113 {
 114         uchar *d = (uchar *) dest;
 115         short s = src;
 116
 117         while (count--)
 118                 *d++ = rtc_read(s++);
 119
 120         return dest;
 121 }
 122
 123 void nvram_write(short dest, const void *src, size_t count)
 124 {
 125         short d = dest;
 126         uchar *s = (uchar *) src;
 127
 128         while (count--)
 129                 rtc_write(d++, *s++);
 130 }
 131
 132 #if defined(CONFIG_CMD_DATE)
 133
 134 /* ------------------------------------------------------------------------- */
 135
 136 int rtc_get (struct rtc_time *tmp)
 137 {
 138         uchar save_ctrl_a;
 139         uchar sec, min, hour, mday, wday, mon, year;
 140
 141         /* Simple: freeze the clock, read it and allow updates again */
 142         save_ctrl_a = rtc_read(RTC_CONTROLA);
 143
 144         /* Set the register to read the value. */
 145         save_ctrl_a |= RTC_CA_READ;
 146         rtc_write(RTC_CONTROLA, save_ctrl_a);
 147
 148         sec             = rtc_read (RTC_SECONDS);
 149         min             = rtc_read (RTC_MINUTES);
 150         hour    = rtc_read (RTC_HOURS);
 151         mday    = rtc_read (RTC_DAY_OF_MONTH);
 152         wday    = rtc_read (RTC_DAY_OF_WEEK);
 153         mon             = rtc_read (RTC_MONTH);
 154         year    = rtc_read (RTC_YEAR);
 155
 156         /* re-enable update */
 157         save_ctrl_a &= ~RTC_CA_READ;
 158         rtc_write(RTC_CONTROLA, save_ctrl_a);
 159
 160 #ifdef RTC_DEBUG
 161         printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
 162                 "hr: %02x min: %02x sec: %02x\n",
 163                 year, mon, mday, wday,
 164                 hour, min, sec );
 165 #endif
 166         tmp->tm_sec  = bcd2bin (sec  & 0x7F);
 167         tmp->tm_min  = bcd2bin (min  & 0x7F);
 168         tmp->tm_hour = bcd2bin (hour & 0x3F);
 169         tmp->tm_mday = bcd2bin (mday & 0x3F);
 170         tmp->tm_mon  = bcd2bin (mon & 0x1F);
 171         tmp->tm_year = bcd2bin (year);
 172         tmp->tm_wday = bcd2bin (wday & 0x07);
 173         if(tmp->tm_year<70)
 174                 tmp->tm_year+=2000;
 175         else
 176                 tmp->tm_year+=1900;
 177         tmp->tm_yday = 0;
 178         tmp->tm_isdst= 0;
 179 #ifdef RTC_DEBUG
 180         printf ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 181                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 182                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 183 #endif
 184
 185         return 0;
 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