drivers/rtc/ds12887.c

   1 /*
   2  * (C) Copyright 2003
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 /*
   8  * Date & Time support for the DS12887 RTC
   9  */
  10
  11 #undef  RTC_DEBUG
  12
  13 #include <common.h>
  14 #include <command.h>
  15 #include <config.h>
  16 #include <rtc.h>
  17
  18 #if defined(CONFIG_CMD_DATE)
  19
  20 #define RTC_SECONDS                     0x00
  21 #define RTC_SECONDS_ALARM               0x01
  22 #define RTC_MINUTES                     0x02
  23 #define RTC_MINUTES_ALARM               0x03
  24 #define RTC_HOURS                       0x04
  25 #define RTC_HOURS_ALARM                 0x05
  26 #define RTC_DAY_OF_WEEK                 0x06
  27 #define RTC_DATE_OF_MONTH               0x07
  28 #define RTC_MONTH                       0x08
  29 #define RTC_YEAR                        0x09
  30 #define RTC_CONTROL_A                   0x0A
  31 #define RTC_CONTROL_B                   0x0B
  32 #define RTC_CONTROL_C                   0x0C
  33 #define RTC_CONTROL_D                   0x0D
  34
  35 #define RTC_CA_UIP                      0x80
  36 #define RTC_CB_DM                       0x04
  37 #define RTC_CB_24_12                    0x02
  38 #define RTC_CB_SET                      0x80
  39
  40 #if defined(CONFIG_ATC)
  41
  42 static uchar rtc_read (uchar reg)
  43 {
  44         uchar val;
  45
  46         *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
  47         __asm__ __volatile__ ("sync");
  48
  49         val = *(volatile unsigned char*)(RTC_PORT_DATA);
  50         return (val);
  51 }
  52
  53 static void rtc_write (uchar reg, uchar val)
  54 {
  55         *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
  56         __asm__ __volatile__ ("sync");
  57
  58         *(volatile unsigned char*)(RTC_PORT_DATA) = val;
  59         __asm__ __volatile__ ("sync");
  60 }
  61
  62 #else
  63 # error Board specific rtc access functions should be supplied
  64 #endif
  65
  66 int rtc_get (struct rtc_time *tmp)
  67 {
  68         uchar sec, min, hour, mday, wday, mon, year;
  69
  70         /* check if rtc is available for access */
  71         while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP)
  72                 ;
  73
  74         sec  = rtc_read(RTC_SECONDS);
  75         min  = rtc_read(RTC_MINUTES);
  76         hour = rtc_read(RTC_HOURS);
  77         mday = rtc_read(RTC_DATE_OF_MONTH);
  78         wday = rtc_read(RTC_DAY_OF_WEEK);
  79         mon  = rtc_read(RTC_MONTH);
  80         year = rtc_read(RTC_YEAR);
  81
  82 #ifdef RTC_DEBUG
  83         printf( "Get RTC year: %d; mon: %d; mday: %d; wday: %d; "
  84                 "hr: %d; min: %d; sec: %d\n",
  85                 year, mon, mday, wday, hour, min, sec );
  86
  87         printf ( "Alarms: hour: %02x min: %02x sec: %02x\n",
  88                  rtc_read (RTC_HOURS_ALARM),
  89                  rtc_read (RTC_MINUTES_ALARM),
  90                  rtc_read (RTC_SECONDS_ALARM) );
  91 #endif
  92
  93         if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
  94         {           /* Information is in BCD format */
  95 printf(" Get: Convert BSD to BIN\n");
  96                 tmp->tm_sec  = bcd2bin (sec  & 0x7F);
  97                 tmp->tm_min  = bcd2bin (min  & 0x7F);
  98                 tmp->tm_hour = bcd2bin (hour & 0x3F);
  99                 tmp->tm_mday = bcd2bin (mday & 0x3F);
 100                 tmp->tm_mon  = bcd2bin (mon & 0x1F);
 101                 tmp->tm_year = bcd2bin (year);
 102                 tmp->tm_wday = bcd2bin (wday & 0x07);
 103         }
 104 else
 105         {
 106                 tmp->tm_sec  = sec  & 0x7F;
 107                 tmp->tm_min  = min  & 0x7F;
 108                 tmp->tm_hour = hour & 0x3F;
 109                 tmp->tm_mday = mday & 0x3F;
 110                 tmp->tm_mon  = mon & 0x1F;
 111                 tmp->tm_year = year;
 112                 tmp->tm_wday = wday & 0x07;
 113         }
 114
 115
 116         if(tmp->tm_year<70)
 117                 tmp->tm_year+=2000;
 118         else
 119                 tmp->tm_year+=1900;
 120
 121         tmp->tm_yday = 0;
 122         tmp->tm_isdst= 0;
 123 #ifdef RTC_DEBUG
 124         printf ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 125                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 126                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 127 #endif
 128
 129         return 0;
 130 }
 131
 132 int rtc_set (struct rtc_time *tmp)
 133 {
 134         uchar save_ctrl_b;
 135         uchar sec, min, hour, mday, wday, mon, year;
 136
 137 #ifdef RTC_DEBUG
 138         printf ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 139                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 140                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 141 #endif
 142
 143         if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
 144         {           /* Information is in BCD format */
 145                 year = bin2bcd(tmp->tm_year % 100);
 146                 mon  = bin2bcd(tmp->tm_mon);
 147                 wday = bin2bcd(tmp->tm_wday);
 148                 mday = bin2bcd(tmp->tm_mday);
 149                 hour = bin2bcd(tmp->tm_hour);
 150                 min  = bin2bcd(tmp->tm_min);
 151                 sec  = bin2bcd(tmp->tm_sec);
 152         }
 153         else
 154         {
 155                 year = tmp->tm_year % 100;
 156                 mon  = tmp->tm_mon;
 157                 wday = tmp->tm_wday;
 158                 mday = tmp->tm_mday;
 159                 hour = tmp->tm_hour;
 160                 min  = tmp->tm_min;
 161                 sec  = tmp->tm_sec;
 162         }
 163
 164         /* disables the RTC to update the regs */
 165         save_ctrl_b = rtc_read(RTC_CONTROL_B);
 166         save_ctrl_b |= RTC_CB_SET;
 167         rtc_write(RTC_CONTROL_B, save_ctrl_b);
 168
 169         rtc_write (RTC_YEAR, year);
 170         rtc_write (RTC_MONTH, mon);
 171         rtc_write (RTC_DAY_OF_WEEK, wday);
 172         rtc_write (RTC_DATE_OF_MONTH, mday);
 173         rtc_write (RTC_HOURS, hour);
 174         rtc_write (RTC_MINUTES, min);
 175         rtc_write (RTC_SECONDS, sec);
 176
 177         /* enables the RTC to update the regs */
 178         save_ctrl_b &= ~RTC_CB_SET;
 179         rtc_write(RTC_CONTROL_B, save_ctrl_b);
 180
 181         return 0;
 182 }
 183
 184 void rtc_reset (void)
 185 {
 186         struct rtc_time tmp;
 187         uchar ctrl_rg;
 188
 189         ctrl_rg = RTC_CB_SET;
 190         rtc_write(RTC_CONTROL_B,ctrl_rg);
 191
 192         tmp.tm_year = 1970 % 100;
 193         tmp.tm_mon = 1;
 194         tmp.tm_mday= 1;
 195         tmp.tm_hour = 0;
 196         tmp.tm_min = 0;
 197         tmp.tm_sec = 0;
 198
 199 #ifdef RTC_DEBUG
 200         printf ( "RTC:   %4d-%02d-%02d %2d:%02d:%02d UTC\n",
 201                     tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
 202                     tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
 203 #endif
 204
 205         ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM;
 206         rtc_write(RTC_CONTROL_B,ctrl_rg);
 207         rtc_set(&tmp);
 208
 209         rtc_write(RTC_HOURS_ALARM, 0),
 210         rtc_write(RTC_MINUTES_ALARM, 0),
 211         rtc_write(RTC_SECONDS_ALARM, 0);
 212
 213         ctrl_rg = RTC_CB_24_12 | RTC_CB_DM;
 214         rtc_write(RTC_CONTROL_B,ctrl_rg);
 215 }
 216
 217 #endif