drivers/rtc/ds12887.c

   1 /*
   2  * (C) Copyright 2003
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  17  * MA 02111-1307 USA
  18  */
  19
  20 /*
  21  * Date & Time support for the DS12887 RTC
  22  */
  23
  24 #undef  RTC_DEBUG
  25
  26 #include <common.h>
  27 #include <command.h>
  28 #include <config.h>
  29 #include <rtc.h>
  30
  31 #if defined(CONFIG_RTC_DS12887) && defined(CONFIG_CMD_DATE)
  32
  33 #define RTC_SECONDS                     0x00
  34 #define RTC_SECONDS_ALARM               0x01
  35 #define RTC_MINUTES                     0x02
  36 #define RTC_MINUTES_ALARM               0x03
  37 #define RTC_HOURS                       0x04
  38 #define RTC_HOURS_ALARM                 0x05
  39 #define RTC_DAY_OF_WEEK                 0x06
  40 #define RTC_DATE_OF_MONTH               0x07
  41 #define RTC_MONTH                       0x08
  42 #define RTC_YEAR                        0x09
  43 #define RTC_CONTROL_A                   0x0A
  44 #define RTC_CONTROL_B                   0x0B
  45 #define RTC_CONTROL_C                   0x0C
  46 #define RTC_CONTROL_D                   0x0D
  47
  48 #define RTC_CA_UIP                      0x80
  49 #define RTC_CB_DM                       0x04
  50 #define RTC_CB_24_12                    0x02
  51 #define RTC_CB_SET                      0x80
  52
  53 #if defined(CONFIG_ATC)
  54
  55 static uchar rtc_read (uchar reg)
  56 {
  57         uchar val;
  58
  59         *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
  60         __asm__ __volatile__ ("sync");
  61
  62         val = *(volatile unsigned char*)(RTC_PORT_DATA);
  63         return (val);
  64 }
  65
  66 static void rtc_write (uchar reg, uchar val)
  67 {
  68         *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
  69         __asm__ __volatile__ ("sync");
  70
  71         *(volatile unsigned char*)(RTC_PORT_DATA) = val;
  72         __asm__ __volatile__ ("sync");
  73 }
  74
  75 #else
  76 # error Board specific rtc access functions should be supplied
  77 #endif
  78
  79 static unsigned bcd2bin (uchar n)
  80 {
  81         return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
  82 }
  83
  84 static unsigned char bin2bcd (unsigned int n)
  85 {
  86         return (((n / 10) << 4) | (n % 10));
  87 }
  88
  89 /* ------------------------------------------------------------------------- */
  90
  91 int rtc_get (struct rtc_time *tmp)
  92 {
  93         uchar sec, min, hour, mday, wday, mon, year;
  94
  95         /* check if rtc is available for access */
  96         while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP)
  97                 ;
  98
  99         sec  = rtc_read(RTC_SECONDS);
 100         min  = rtc_read(RTC_MINUTES);
 101         hour = rtc_read(RTC_HOURS);
 102         mday = rtc_read(RTC_DATE_OF_MONTH);
 103         wday = rtc_read(RTC_DAY_OF_WEEK);
 104         mon  = rtc_read(RTC_MONTH);
 105         year = rtc_read(RTC_YEAR);
 106
 107 #ifdef RTC_DEBUG
 108         printf( "Get RTC year: %d; mon: %d; mday: %d; wday: %d; "
 109                 "hr: %d; min: %d; sec: %d\n",
 110                 year, mon, mday, wday, hour, min, sec );
 111
 112         printf ( "Alarms: hour: %02x min: %02x sec: %02x\n",
 113                  rtc_read (RTC_HOURS_ALARM),
 114                  rtc_read (RTC_MINUTES_ALARM),
 115                  rtc_read (RTC_SECONDS_ALARM) );
 116 #endif
 117
 118         if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
 119         {           /* Information is in BCD format */
 120 printf(" Get: Convert BSD to BIN\n");
 121                 tmp->tm_sec  = bcd2bin (sec  & 0x7F);
 122                 tmp->tm_min  = bcd2bin (min  & 0x7F);
 123                 tmp->tm_hour = bcd2bin (hour & 0x3F);
 124                 tmp->tm_mday = bcd2bin (mday & 0x3F);
 125                 tmp->tm_mon  = bcd2bin (mon & 0x1F);
 126                 tmp->tm_year = bcd2bin (year);
 127                 tmp->tm_wday = bcd2bin (wday & 0x07);
 128         }
 129 else
 130         {
 131                 tmp->tm_sec  = sec  & 0x7F;
 132                 tmp->tm_min  = min  & 0x7F;
 133                 tmp->tm_hour = hour & 0x3F;
 134                 tmp->tm_mday = mday & 0x3F;
 135                 tmp->tm_mon  = mon & 0x1F;
 136                 tmp->tm_year = year;
 137                 tmp->tm_wday = wday & 0x07;
 138         }
 139
 140
 141         if(tmp->tm_year<70)
 142                 tmp->tm_year+=2000;
 143         else
 144                 tmp->tm_year+=1900;
 145
 146         tmp->tm_yday = 0;
 147         tmp->tm_isdst= 0;
 148 #ifdef RTC_DEBUG
 149         printf ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 150                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 151                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 152 #endif
 153
 154         return 0;
 155 }
 156
 157 void rtc_set (struct rtc_time *tmp)
 158 {
 159         uchar save_ctrl_b;
 160         uchar sec, min, hour, mday, wday, mon, year;
 161
 162 #ifdef RTC_DEBUG
 163         printf ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 164                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 165                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 166 #endif
 167
 168         if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
 169         {           /* Information is in BCD format */
 170                 year = bin2bcd(tmp->tm_year % 100);
 171                 mon  = bin2bcd(tmp->tm_mon);
 172                 wday = bin2bcd(tmp->tm_wday);
 173                 mday = bin2bcd(tmp->tm_mday);
 174                 hour = bin2bcd(tmp->tm_hour);
 175                 min  = bin2bcd(tmp->tm_min);
 176                 sec  = bin2bcd(tmp->tm_sec);
 177         }
 178         else
 179         {
 180                 year = tmp->tm_year % 100;
 181                 mon  = tmp->tm_mon;
 182                 wday = tmp->tm_wday;
 183                 mday = tmp->tm_mday;
 184                 hour = tmp->tm_hour;
 185                 min  = tmp->tm_min;
 186                 sec  = tmp->tm_sec;
 187         }
 188
 189         /* disables the RTC to update the regs */
 190         save_ctrl_b = rtc_read(RTC_CONTROL_B);
 191         save_ctrl_b |= RTC_CB_SET;
 192         rtc_write(RTC_CONTROL_B, save_ctrl_b);
 193
 194         rtc_write (RTC_YEAR, year);
 195         rtc_write (RTC_MONTH, mon);
 196         rtc_write (RTC_DAY_OF_WEEK, wday);
 197         rtc_write (RTC_DATE_OF_MONTH, mday);
 198         rtc_write (RTC_HOURS, hour);
 199         rtc_write (RTC_MINUTES, min);
 200         rtc_write (RTC_SECONDS, sec);
 201
 202         /* enables the RTC to update the regs */
 203         save_ctrl_b &= ~RTC_CB_SET;
 204         rtc_write(RTC_CONTROL_B, save_ctrl_b);
 205 }
 206
 207 void rtc_reset (void)
 208 {
 209         struct rtc_time tmp;
 210         uchar ctrl_rg;
 211
 212         ctrl_rg = RTC_CB_SET;
 213         rtc_write(RTC_CONTROL_B,ctrl_rg);
 214
 215         tmp.tm_year = 1970 % 100;
 216         tmp.tm_mon = 1;
 217         tmp.tm_mday= 1;
 218         tmp.tm_hour = 0;
 219         tmp.tm_min = 0;
 220         tmp.tm_sec = 0;
 221
 222 #ifdef RTC_DEBUG
 223         printf ( "RTC:   %4d-%02d-%02d %2d:%02d:%02d UTC\n",
 224                     tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
 225                     tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
 226 #endif
 227
 228         ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM;
 229         rtc_write(RTC_CONTROL_B,ctrl_rg);
 230         rtc_set(&tmp);
 231
 232         rtc_write(RTC_HOURS_ALARM, 0),
 233         rtc_write(RTC_MINUTES_ALARM, 0),
 234         rtc_write(RTC_SECONDS_ALARM, 0);
 235
 236         ctrl_rg = RTC_CB_24_12 | RTC_CB_DM;
 237         rtc_write(RTC_CONTROL_B,ctrl_rg);
 238 }
 239
 240 #endif