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  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * Date & Time support for the MK48T59 RTC
  10  */
  11
  12 #undef  RTC_DEBUG
  13
  14 #include <common.h>
  15 #include <command.h>
  16 #include <config.h>
  17 #include <rtc.h>
  18 #include <mk48t59.h>
  19
  20 #if defined(CONFIG_BAB7xx)
  21
  22 static uchar rtc_read (short reg)
  23 {
  24         out8(RTC_PORT_ADDR0, reg & 0xFF);
  25         out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
  26         return in8(RTC_PORT_DATA);
  27 }
  28
  29 static void rtc_write (short reg, uchar val)
  30 {
  31         out8(RTC_PORT_ADDR0, reg & 0xFF);
  32         out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
  33         out8(RTC_PORT_DATA, val);
  34 }
  35
  36 #elif defined(CONFIG_EVAL5200)
  37
  38 static uchar rtc_read (short reg)
  39 {
  40         return in8(RTC(reg));
  41 }
  42
  43 static void rtc_write (short reg, uchar val)
  44 {
  45         out8(RTC(reg),val);
  46 }
  47
  48 #else
  49 # error Board specific rtc access functions should be supplied
  50 #endif
  51
  52 /* ------------------------------------------------------------------------- */
  53
  54 void *nvram_read(void *dest, const short src, size_t count)
  55 {
  56         uchar *d = (uchar *) dest;
  57         short s = src;
  58
  59         while (count--)
  60                 *d++ = rtc_read(s++);
  61
  62         return dest;
  63 }
  64
  65 void nvram_write(short dest, const void *src, size_t count)
  66 {
  67         short d = dest;
  68         uchar *s = (uchar *) src;
  69
  70         while (count--)
  71                 rtc_write(d++, *s++);
  72 }
  73
  74 #if defined(CONFIG_CMD_DATE)
  75
  76 /* ------------------------------------------------------------------------- */
  77
  78 int rtc_get (struct rtc_time *tmp)
  79 {
  80         uchar save_ctrl_a;
  81         uchar sec, min, hour, mday, wday, mon, year;
  82
  83         /* Simple: freeze the clock, read it and allow updates again */
  84         save_ctrl_a = rtc_read(RTC_CONTROLA);
  85
  86         /* Set the register to read the value. */
  87         save_ctrl_a |= RTC_CA_READ;
  88         rtc_write(RTC_CONTROLA, save_ctrl_a);
  89
  90         sec             = rtc_read (RTC_SECONDS);
  91         min             = rtc_read (RTC_MINUTES);
  92         hour    = rtc_read (RTC_HOURS);
  93         mday    = rtc_read (RTC_DAY_OF_MONTH);
  94         wday    = rtc_read (RTC_DAY_OF_WEEK);
  95         mon             = rtc_read (RTC_MONTH);
  96         year    = rtc_read (RTC_YEAR);
  97
  98         /* re-enable update */
  99         save_ctrl_a &= ~RTC_CA_READ;
 100         rtc_write(RTC_CONTROLA, save_ctrl_a);
 101
 102 #ifdef RTC_DEBUG
 103         printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
 104                 "hr: %02x min: %02x sec: %02x\n",
 105                 year, mon, mday, wday,
 106                 hour, min, sec );
 107 #endif
 108         tmp->tm_sec  = bcd2bin (sec  & 0x7F);
 109         tmp->tm_min  = bcd2bin (min  & 0x7F);
 110         tmp->tm_hour = bcd2bin (hour & 0x3F);
 111         tmp->tm_mday = bcd2bin (mday & 0x3F);
 112         tmp->tm_mon  = bcd2bin (mon & 0x1F);
 113         tmp->tm_year = bcd2bin (year);
 114         tmp->tm_wday = bcd2bin (wday & 0x07);
 115         if(tmp->tm_year<70)
 116                 tmp->tm_year+=2000;
 117         else
 118                 tmp->tm_year+=1900;
 119         tmp->tm_yday = 0;
 120         tmp->tm_isdst= 0;
 121 #ifdef RTC_DEBUG
 122         printf ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 123                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 124                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 125 #endif
 126
 127         return 0;
 128 }
 129
 130 int rtc_set (struct rtc_time *tmp)
 131 {
 132         uchar save_ctrl_a;
 133
 134 #ifdef RTC_DEBUG
 135         printf ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 136                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 137                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 138 #endif
 139         save_ctrl_a = rtc_read(RTC_CONTROLA);
 140
 141         save_ctrl_a |= RTC_CA_WRITE;
 142         rtc_write(RTC_CONTROLA, save_ctrl_a); /* disables the RTC to update the regs */
 143
 144         rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
 145         rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
 146
 147         rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
 148         rtc_write (RTC_DAY_OF_MONTH, bin2bcd(tmp->tm_mday));
 149         rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
 150         rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
 151         rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
 152
 153         save_ctrl_a &= ~RTC_CA_WRITE;
 154         rtc_write(RTC_CONTROLA, save_ctrl_a); /* enables the RTC to update the regs */
 155
 156         return 0;
 157 }
 158
 159 void rtc_reset (void)
 160 {
 161         uchar control_b;
 162
 163         /*
 164          * Start oscillator here.
 165          */
 166         control_b = rtc_read(RTC_CONTROLB);
 167
 168         control_b &= ~RTC_CB_STOP;
 169         rtc_write(RTC_CONTROLB, control_b);
 170 }
 171
 172 void rtc_set_watchdog(short multi, short res)
 173 {
 174         uchar wd_value;
 175
 176         wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3);
 177         rtc_write(RTC_WATCHDOG, wd_value);
 178 }
 179
 180 #endif