LXR uboot/drivers/rtc/mcfrtc.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
   4 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   5 */
   6
   7#include <common.h>
   8
   9#include <command.h>
  10#include <rtc.h>
  11#include <asm/immap.h>
  12#include <asm/rtc.h>
  13
  14#undef RTC_DEBUG
  15
  16#ifndef CONFIG_SYS_MCFRTC_BASE
  17#error RTC_BASE is not defined!
  18#endif
  19
  20#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  21#define STARTOFTIME             1970
  22
  23int rtc_get(struct rtc_time *tmp)
  24{
  25        volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
  26
  27        int rtc_days, rtc_hrs, rtc_mins;
  28        int tim;
  29
  30        rtc_days = rtc->days;
  31        rtc_hrs = rtc->hourmin >> 8;
  32        rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
  33
  34        tim = (rtc_days * 24) + rtc_hrs;
  35        tim = (tim * 60) + rtc_mins;
  36        tim = (tim * 60) + rtc->seconds;
  37
  38        rtc_to_tm(tim, tmp);
  39
  40        tmp->tm_yday = 0;
  41        tmp->tm_isdst = 0;
  42
  43#ifdef RTC_DEBUG
  44        printf("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  45               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  46               tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  47#endif
  48
  49        return 0;
  50}
  51
  52int rtc_set(struct rtc_time *tmp)
  53{
  54        volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
  55
  56        static int month_days[12] = {
  57                31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
  58        };
  59        int days, i, months;
  60
  61        if (tmp->tm_year > 2037) {
  62                printf("Unable to handle. Exceeding integer limitation!\n");
  63                tmp->tm_year = 2027;
  64        }
  65#ifdef RTC_DEBUG
  66        printf("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  67               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  68               tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  69#endif
  70
  71        /* calculate days by years */
  72        for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
  73                days += 365 + isleap(i);
  74        }
  75
  76        /* calculate days by months */
  77        months = tmp->tm_mon - 1;
  78        for (i = 0; i < months; i++) {
  79                days += month_days[i];
  80
  81                if (i == 1)
  82                        days += isleap(i);
  83        }
  84
  85        days += tmp->tm_mday - 1;
  86
  87        rtc->days = days;
  88        rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
  89        rtc->seconds = tmp->tm_sec;
  90
  91        return 0;
  92}
  93
  94void rtc_reset(void)
  95{
  96        volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
  97
  98        if ((rtc->cr & RTC_CR_EN) == 0) {
  99                printf("real-time-clock was stopped. Now starting...\n");
 100                rtc->cr |= RTC_CR_EN;
 101        }
 102
 103        rtc->cr |= RTC_CR_SWR;
 104}
 105