LXR uboot/drivers/rtc/s3c24x0

   1/*
   2 * (C) Copyright 2003
   3 * David Müller ELSOFT AG Switzerland. d.mueller@elsoft.ch
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8/*
   9 * Date & Time support for the built-in Samsung S3C24X0 RTC
  10 */
  11
  12#include <common.h>
  13#include <command.h>
  14
  15#if (defined(CONFIG_CMD_DATE))
  16
  17#include <asm/arch/s3c24x0_cpu.h>
  18
  19#include <rtc.h>
  20#include <asm/io.h>
  21#include <linux/compiler.h>
  22
  23typedef enum {
  24        RTC_ENABLE,
  25        RTC_DISABLE
  26} RTC_ACCESS;
  27
  28
  29static inline void SetRTC_Access(RTC_ACCESS a)
  30{
  31        struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
  32
  33        switch (a) {
  34        case RTC_ENABLE:
  35                writeb(readb(&rtc->rtccon) | 0x01, &rtc->rtccon);
  36                break;
  37
  38        case RTC_DISABLE:
  39                writeb(readb(&rtc->rtccon) & ~0x01, &rtc->rtccon);
  40                break;
  41        }
  42}
  43
  44/* ------------------------------------------------------------------------- */
  45
  46int rtc_get(struct rtc_time *tmp)
  47{
  48        struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
  49        uchar sec, min, hour, mday, wday, mon, year;
  50        __maybe_unused uchar a_sec, a_min, a_hour, a_date,
  51                             a_mon, a_year, a_armed;
  52
  53        /* enable access to RTC registers */
  54        SetRTC_Access(RTC_ENABLE);
  55
  56        /* read RTC registers */
  57        do {
  58                sec  = readb(&rtc->bcdsec);
  59                min  = readb(&rtc->bcdmin);
  60                hour = readb(&rtc->bcdhour);
  61                mday = readb(&rtc->bcddate);
  62                wday = readb(&rtc->bcdday);
  63                mon  = readb(&rtc->bcdmon);
  64                year = readb(&rtc->bcdyear);
  65        } while (sec != readb(&rtc->bcdsec));
  66
  67        /* read ALARM registers */
  68        a_sec   = readb(&rtc->almsec);
  69        a_min   = readb(&rtc->almmin);
  70        a_hour  = readb(&rtc->almhour);
  71        a_date  = readb(&rtc->almdate);
  72        a_mon   = readb(&rtc->almmon);
  73        a_year  = readb(&rtc->almyear);
  74        a_armed = readb(&rtc->rtcalm);
  75
  76        /* disable access to RTC registers */
  77        SetRTC_Access(RTC_DISABLE);
  78
  79#ifdef RTC_DEBUG
  80        printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
  81               "hr: %02x min: %02x sec: %02x\n",
  82               year, mon, mday, wday, hour, min, sec);
  83        printf("Alarms: %02x: year: %02x month: %02x date: %02x hour: "
  84               "%02x min: %02x sec: %02x\n",
  85               a_armed, a_year, a_mon, a_date, a_hour, a_min, a_sec);
  86#endif
  87
  88        tmp->tm_sec  = bcd2bin(sec & 0x7F);
  89        tmp->tm_min  = bcd2bin(min & 0x7F);
  90        tmp->tm_hour = bcd2bin(hour & 0x3F);
  91        tmp->tm_mday = bcd2bin(mday & 0x3F);
  92        tmp->tm_mon  = bcd2bin(mon & 0x1F);
  93        tmp->tm_year = bcd2bin(year);
  94        tmp->tm_wday = bcd2bin(wday & 0x07);
  95        if (tmp->tm_year < 70)
  96                tmp->tm_year += 2000;
  97        else
  98                tmp->tm_year += 1900;
  99        tmp->tm_yday  = 0;
 100        tmp->tm_isdst = 0;
 101#ifdef RTC_DEBUG
 102        printf("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 103               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 104               tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 105#endif
 106
 107        return 0;
 108}
 109
 110int rtc_set(struct rtc_time *tmp)
 111{
 112        struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
 113        uchar sec, min, hour, mday, wday, mon, year;
 114
 115#ifdef RTC_DEBUG
 116        printf("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 117               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 118               tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 119#endif
 120        year = bin2bcd(tmp->tm_year % 100);
 121        mon  = bin2bcd(tmp->tm_mon);
 122        wday = bin2bcd(tmp->tm_wday);
 123        mday = bin2bcd(tmp->tm_mday);
 124        hour = bin2bcd(tmp->tm_hour);
 125        min  = bin2bcd(tmp->tm_min);
 126        sec  = bin2bcd(tmp->tm_sec);
 127
 128        /* enable access to RTC registers */
 129        SetRTC_Access(RTC_ENABLE);
 130
 131        /* write RTC registers */
 132        writeb(sec, &rtc->bcdsec);
 133        writeb(min, &rtc->bcdmin);
 134        writeb(hour, &rtc->bcdhour);
 135        writeb(mday, &rtc->bcddate);
 136        writeb(wday, &rtc->bcdday);
 137        writeb(mon, &rtc->bcdmon);
 138        writeb(year, &rtc->bcdyear);
 139
 140        /* disable access to RTC registers */
 141        SetRTC_Access(RTC_DISABLE);
 142
 143        return 0;
 144}
 145
 146void rtc_reset(void)
 147{
 148        struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
 149
 150        writeb((readb(&rtc->rtccon) & ~0x06) | 0x08, &rtc->rtccon);
 151        writeb(readb(&rtc->rtccon) & ~(0x08 | 0x01), &rtc->rtccon);
 152}
 153
 154#endif
 155