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