mvrtc.c
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/*
* Copyright (C) 2011
* Jason Cooper <u-boot@lakedaemon.net>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Date & Time support for Marvell Integrated RTC
*/
#include <common.h>
#include <command.h>
#include <rtc.h>
#include <asm/io.h>
#include "mvrtc.h"
/* This RTC does not support century, so we assume 20 */
#define CENTURY 20
int rtc_get(struct rtc_time *t)
{
u32 time;
u32 date;
struct mvrtc_registers *mvrtc_regs;
mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
/* read the time register */
time = readl(&mvrtc_regs->time);
/* read the date register */
date = readl(&mvrtc_regs->date);
/* test for 12 hour clock (can't tell if it's am/pm) */
if (time & MVRTC_HRFMT_MSK) {
printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
return -1;
}
/* time */
t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
t->tm_wday--;
/* date */
t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK);
t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
t->tm_year += CENTURY * 100;
/* not supported in this RTC */
t->tm_yday = 0;
t->tm_isdst = 0;
return 0;
}
int rtc_set(struct rtc_time *t)
{
u32 time = 0; /* sets hour format bit to zero, 24hr format. */
u32 date = 0;
struct mvrtc_registers *mvrtc_regs;
mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
/* check that this code isn't 80+ years old ;-) */
if ((t->tm_year / 100) != CENTURY)
printf("Warning: Only century %d supported.\n", CENTURY);
/* time */
time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT;
time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT;
time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT;
/* date */
date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT;
date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
/* write the time register */
writel(time, &mvrtc_regs->time);
/* write the date register */
writel(date, &mvrtc_regs->date);
return 0;
}
void rtc_reset(void)
{
u32 time;
u32 sec;
struct mvrtc_registers *mvrtc_regs;
mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
/* no init routine for this RTC needed, just check that it's working */
time = readl(&mvrtc_regs->time);
sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
udelay(1000000);
time = readl(&mvrtc_regs->time);
if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
printf("Error: RTC did not increment.\n");
}