drivers/rtc/mk48t59.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Andreas Heppel <aheppel@sysgo.de>
   5  */
   6
   7 /*
   8  * Date & Time support for the MK48T59 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 #include <mk48t59.h>
  18
  19 #if defined(CONFIG_BAB7xx)
  20
  21 static uchar rtc_read (short reg)
  22 {
  23         out8(RTC_PORT_ADDR0, reg & 0xFF);
  24         out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
  25         return in8(RTC_PORT_DATA);
  26 }
  27
  28 static void rtc_write (short reg, uchar val)
  29 {
  30         out8(RTC_PORT_ADDR0, reg & 0xFF);
  31         out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
  32         out8(RTC_PORT_DATA, val);
  33 }
  34
  35 #elif defined(CONFIG_EVAL5200)
  36
  37 static uchar rtc_read (short reg)
  38 {
  39         return in8(RTC(reg));
  40 }
  41
  42 static void rtc_write (short reg, uchar val)
  43 {
  44         out8(RTC(reg),val);
  45 }
  46
  47 #else
  48 # error Board specific rtc access functions should be supplied
  49 #endif
  50
  51 /* ------------------------------------------------------------------------- */
  52
  53 void *nvram_read(void *dest, const short src, size_t count)
  54 {
  55         uchar *d = (uchar *) dest;
  56         short s = src;
  57
  58         while (count--)
  59                 *d++ = rtc_read(s++);
  60
  61         return dest;
  62 }
  63
  64 void nvram_write(short dest, const void *src, size_t count)
  65 {
  66         short d = dest;
  67         uchar *s = (uchar *) src;
  68
  69         while (count--)
  70                 rtc_write(d++, *s++);
  71 }
  72
  73 /* ------------------------------------------------------------------------- */
  74
  75 int rtc_get (struct rtc_time *tmp)
  76 {
  77         uchar save_ctrl_a;
  78         uchar sec, min, hour, mday, wday, mon, year;
  79
  80         /* Simple: freeze the clock, read it and allow updates again */
  81         save_ctrl_a = rtc_read(RTC_CONTROLA);
  82
  83         /* Set the register to read the value. */
  84         save_ctrl_a |= RTC_CA_READ;
  85         rtc_write(RTC_CONTROLA, save_ctrl_a);
  86
  87         sec             = rtc_read (RTC_SECONDS);
  88         min             = rtc_read (RTC_MINUTES);
  89         hour    = rtc_read (RTC_HOURS);
  90         mday    = rtc_read (RTC_DAY_OF_MONTH);
  91         wday    = rtc_read (RTC_DAY_OF_WEEK);
  92         mon             = rtc_read (RTC_MONTH);
  93         year    = rtc_read (RTC_YEAR);
  94
  95         /* re-enable update */
  96         save_ctrl_a &= ~RTC_CA_READ;
  97         rtc_write(RTC_CONTROLA, save_ctrl_a);
  98
  99 #ifdef RTC_DEBUG
 100         printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
 101                 "hr: %02x min: %02x sec: %02x\n",
 102                 year, mon, mday, wday,
 103                 hour, min, sec );
 104 #endif
 105         tmp->tm_sec  = bcd2bin (sec  & 0x7F);
 106         tmp->tm_min  = bcd2bin (min  & 0x7F);
 107         tmp->tm_hour = bcd2bin (hour & 0x3F);
 108         tmp->tm_mday = bcd2bin (mday & 0x3F);
 109         tmp->tm_mon  = bcd2bin (mon & 0x1F);
 110         tmp->tm_year = bcd2bin (year);
 111         tmp->tm_wday = bcd2bin (wday & 0x07);
 112         if(tmp->tm_year<70)
 113                 tmp->tm_year+=2000;
 114         else
 115                 tmp->tm_year+=1900;
 116         tmp->tm_yday = 0;
 117         tmp->tm_isdst= 0;
 118 #ifdef RTC_DEBUG
 119         printf ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 120                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 121                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 122 #endif
 123
 124         return 0;
 125 }
 126
 127 int rtc_set (struct rtc_time *tmp)
 128 {
 129         uchar save_ctrl_a;
 130
 131 #ifdef RTC_DEBUG
 132         printf ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 133                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 134                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 135 #endif
 136         save_ctrl_a = rtc_read(RTC_CONTROLA);
 137
 138         save_ctrl_a |= RTC_CA_WRITE;
 139         rtc_write(RTC_CONTROLA, save_ctrl_a); /* disables the RTC to update the regs */
 140
 141         rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
 142         rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
 143
 144         rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
 145         rtc_write (RTC_DAY_OF_MONTH, bin2bcd(tmp->tm_mday));
 146         rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
 147         rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
 148         rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
 149
 150         save_ctrl_a &= ~RTC_CA_WRITE;
 151         rtc_write(RTC_CONTROLA, save_ctrl_a); /* enables the RTC to update the regs */
 152
 153         return 0;
 154 }
 155
 156 void rtc_reset (void)
 157 {
 158         uchar control_b;
 159
 160         /*
 161          * Start oscillator here.
 162          */
 163         control_b = rtc_read(RTC_CONTROLB);
 164
 165         control_b &= ~RTC_CB_STOP;
 166         rtc_write(RTC_CONTROLB, control_b);
 167 }
 168
 169 void rtc_set_watchdog(short multi, short res)
 170 {
 171         uchar wd_value;
 172
 173         wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3);
 174         rtc_write(RTC_WATCHDOG, wd_value);
 175 }