LXR uboot/drivers/rtc/s3c24x0

   1/*
   2 * (C) Copyright 2003
   3 * David Müller ELSOFT AG Switzerland. d.mueller@elsoft.ch
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 */
  23
  24/*
  25 * Date & Time support for the built-in Samsung S3C24X0 RTC
  26 */
  27
  28#include <common.h>
  29#include <command.h>
  30
  31#if (defined(CONFIG_CMD_DATE))
  32
  33#include <asm/arch/s3c24x0_cpu.h>
  34
  35#include <rtc.h>
  36#include <asm/io.h>
  37#include <linux/compiler.h>
  38
  39typedef enum {
  40        RTC_ENABLE,
  41        RTC_DISABLE
  42} RTC_ACCESS;
  43
  44
  45static inline void SetRTC_Access(RTC_ACCESS a)
  46{
  47        struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
  48
  49        switch (a) {
  50        case RTC_ENABLE:
  51                writeb(readb(&rtc->rtccon) | 0x01, &rtc->rtccon);
  52                break;
  53
  54        case RTC_DISABLE:
  55                writeb(readb(&rtc->rtccon) & ~0x01, &rtc->rtccon);
  56                break;
  57        }
  58}
  59
  60/* ------------------------------------------------------------------------- */
  61
  62int rtc_get(struct rtc_time *tmp)
  63{
  64        struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
  65        uchar sec, min, hour, mday, wday, mon, year;
  66        __maybe_unused uchar a_sec, a_min, a_hour, a_date,
  67                             a_mon, a_year, a_armed;
  68
  69        /* enable access to RTC registers */
  70        SetRTC_Access(RTC_ENABLE);
  71
  72        /* read RTC registers */
  73        do {
  74                sec  = readb(&rtc->bcdsec);
  75                min  = readb(&rtc->bcdmin);
  76                hour = readb(&rtc->bcdhour);
  77                mday = readb(&rtc->bcddate);
  78                wday = readb(&rtc->bcdday);
  79                mon  = readb(&rtc->bcdmon);
  80                year = readb(&rtc->bcdyear);
  81        } while (sec != readb(&rtc->bcdsec));
  82
  83        /* read ALARM registers */
  84        a_sec   = readb(&rtc->almsec);
  85        a_min   = readb(&rtc->almmin);
  86        a_hour  = readb(&rtc->almhour);
  87        a_date  = readb(&rtc->almdate);
  88        a_mon   = readb(&rtc->almmon);
  89        a_year  = readb(&rtc->almyear);
  90        a_armed = readb(&rtc->rtcalm);
  91
  92        /* disable access to RTC registers */
  93        SetRTC_Access(RTC_DISABLE);
  94
  95#ifdef RTC_DEBUG
  96        printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
  97               "hr: %02x min: %02x sec: %02x\n",
  98               year, mon, mday, wday, hour, min, sec);
  99        printf("Alarms: %02x: year: %02x month: %02x date: %02x hour: "
 100               "%02x min: %02x sec: %02x\n",
 101               a_armed, a_year, a_mon, a_date, a_hour, a_min, a_sec);
 102#endif
 103
 104        tmp->tm_sec  = bcd2bin(sec & 0x7F);
 105        tmp->tm_min  = bcd2bin(min & 0x7F);
 106        tmp->tm_hour = bcd2bin(hour & 0x3F);
 107        tmp->tm_mday = bcd2bin(mday & 0x3F);
 108        tmp->tm_mon  = bcd2bin(mon & 0x1F);
 109        tmp->tm_year = bcd2bin(year);
 110        tmp->tm_wday = bcd2bin(wday & 0x07);
 111        if (tmp->tm_year < 70)
 112                tmp->tm_year += 2000;
 113        else
 114                tmp->tm_year += 1900;
 115        tmp->tm_yday  = 0;
 116        tmp->tm_isdst = 0;
 117#ifdef RTC_DEBUG
 118        printf("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 119               tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 120               tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 121#endif
 122
 123        return 0;
 124}
 125
 126int rtc_set(struct rtc_time *tmp)
 127{
 128        struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
 129        uchar sec, min, hour, mday, wday, mon, year;
 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        year = bin2bcd(tmp->tm_year % 100);
 137        mon  = bin2bcd(tmp->tm_mon);
 138        wday = bin2bcd(tmp->tm_wday);
 139        mday = bin2bcd(tmp->tm_mday);
 140        hour = bin2bcd(tmp->tm_hour);
 141        min  = bin2bcd(tmp->tm_min);
 142        sec  = bin2bcd(tmp->tm_sec);
 143
 144        /* enable access to RTC registers */
 145        SetRTC_Access(RTC_ENABLE);
 146
 147        /* write RTC registers */
 148        writeb(sec, &rtc->bcdsec);
 149        writeb(min, &rtc->bcdmin);
 150        writeb(hour, &rtc->bcdhour);
 151        writeb(mday, &rtc->bcddate);
 152        writeb(wday, &rtc->bcdday);
 153        writeb(mon, &rtc->bcdmon);
 154        writeb(year, &rtc->bcdyear);
 155
 156        /* disable access to RTC registers */
 157        SetRTC_Access(RTC_DISABLE);
 158
 159        return 0;
 160}
 161
 162void rtc_reset(void)
 163{
 164        struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
 165
 166        writeb((readb(&rtc->rtccon) & ~0x06) | 0x08, &rtc->rtccon);
 167        writeb(readb(&rtc->rtccon) & ~(0x08 | 0x01), &rtc->rtccon);
 168}
 169
 170#endif
 171