s3c24x0_rtc.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2003
* David Müller ELSOFT AG Switzerland. d.mueller@elsoft.ch
*/
/*
* Date & Time support for the built-in Samsung S3C24X0 RTC
*/
#include <common.h>
#include <command.h>
#include <asm/arch/s3c24x0_cpu.h>
#include <rtc.h>
#include <asm/io.h>
#include <linux/compiler.h>
typedef enum {
RTC_ENABLE,
RTC_DISABLE
} RTC_ACCESS;
static inline void SetRTC_Access(RTC_ACCESS a)
{
struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
switch (a) {
case RTC_ENABLE:
writeb(readb(&rtc->rtccon) | 0x01, &rtc->rtccon);
break;
case RTC_DISABLE:
writeb(readb(&rtc->rtccon) & ~0x01, &rtc->rtccon);
break;
}
}
/* ------------------------------------------------------------------------- */
int rtc_get(struct rtc_time *tmp)
{
struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
uchar sec, min, hour, mday, wday, mon, year;
__maybe_unused uchar a_sec, a_min, a_hour, a_date,
a_mon, a_year, a_armed;
/* enable access to RTC registers */
SetRTC_Access(RTC_ENABLE);
/* read RTC registers */
do {
sec = readb(&rtc->bcdsec);
min = readb(&rtc->bcdmin);
hour = readb(&rtc->bcdhour);
mday = readb(&rtc->bcddate);
wday = readb(&rtc->bcdday);
mon = readb(&rtc->bcdmon);
year = readb(&rtc->bcdyear);
} while (sec != readb(&rtc->bcdsec));
/* read ALARM registers */
a_sec = readb(&rtc->almsec);
a_min = readb(&rtc->almmin);
a_hour = readb(&rtc->almhour);
a_date = readb(&rtc->almdate);
a_mon = readb(&rtc->almmon);
a_year = readb(&rtc->almyear);
a_armed = readb(&rtc->rtcalm);
/* disable access to RTC registers */
SetRTC_Access(RTC_DISABLE);
#ifdef RTC_DEBUG
printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x\n",
year, mon, mday, wday, hour, min, sec);
printf("Alarms: %02x: year: %02x month: %02x date: %02x hour: "
"%02x min: %02x sec: %02x\n",
a_armed, a_year, a_mon, a_date, a_hour, a_min, a_sec);
#endif
tmp->tm_sec = bcd2bin(sec & 0x7F);
tmp->tm_min = bcd2bin(min & 0x7F);
tmp->tm_hour = bcd2bin(hour & 0x3F);
tmp->tm_mday = bcd2bin(mday & 0x3F);
tmp->tm_mon = bcd2bin(mon & 0x1F);
tmp->tm_year = bcd2bin(year);
tmp->tm_wday = bcd2bin(wday & 0x07);
if (tmp->tm_year < 70)
tmp->tm_year += 2000;
else
tmp->tm_year += 1900;
tmp->tm_yday = 0;
tmp->tm_isdst = 0;
#ifdef RTC_DEBUG
printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
return 0;
}
int rtc_set(struct rtc_time *tmp)
{
struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
uchar sec, min, hour, mday, wday, mon, year;
#ifdef RTC_DEBUG
printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
year = bin2bcd(tmp->tm_year % 100);
mon = bin2bcd(tmp->tm_mon);
wday = bin2bcd(tmp->tm_wday);
mday = bin2bcd(tmp->tm_mday);
hour = bin2bcd(tmp->tm_hour);
min = bin2bcd(tmp->tm_min);
sec = bin2bcd(tmp->tm_sec);
/* enable access to RTC registers */
SetRTC_Access(RTC_ENABLE);
/* write RTC registers */
writeb(sec, &rtc->bcdsec);
writeb(min, &rtc->bcdmin);
writeb(hour, &rtc->bcdhour);
writeb(mday, &rtc->bcddate);
writeb(wday, &rtc->bcdday);
writeb(mon, &rtc->bcdmon);
writeb(year, &rtc->bcdyear);
/* disable access to RTC registers */
SetRTC_Access(RTC_DISABLE);
return 0;
}
void rtc_reset(void)
{
struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc();
writeb((readb(&rtc->rtccon) & ~0x06) | 0x08, &rtc->rtccon);
writeb(readb(&rtc->rtccon) & ~(0x08 | 0x01), &rtc->rtccon);
}