110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
|
|
* 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");
|
|
}
|