LXR uboot/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
  21static 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
  28static 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
  37static uchar rtc_read (short reg)
  38{
  39        return in8(RTC(reg));
  40}
  41
  42static 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
  53void *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
  64void 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
  75int 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
 127int 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
 156void 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
 169void 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}
 176