LXR uboot/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
  22static 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
  29static 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
  38static uchar rtc_read (short reg)
  39{
  40        return in8(RTC(reg));
  41}
  42
  43static 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
  54void *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
  65void 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
  78int 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
 130int 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
 159void 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
 172void 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
 181