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82a456a085
Use 32-bit access only where it is needed. Most of the RTC registers contain useful information in the 8 least significant bits, the others are reserved. Signed-off-by: Dario Binacchi <dariobin@libero.it> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Link: https://lore.kernel.org/r/20210602203805.11494-4-dariobin@libero.it
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2011 DENX Software Engineering GmbH
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* Heiko Schocher <hs@denx.de>
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*/
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#include <common.h>
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#include <command.h>
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#include <log.h>
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#include <rtc.h>
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#include <asm/io.h>
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#include <asm/davinci_rtc.h>
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#include <asm/arch/hardware.h>
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#include <linux/delay.h>
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#if !defined(RTC_BASE) && defined(DAVINCI_RTC_BASE)
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#define RTC_BASE DAVINCI_RTC_BASE
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#endif
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int rtc_get(struct rtc_time *tmp)
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{
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struct davinci_rtc *rtc = (struct davinci_rtc *)RTC_BASE;
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unsigned long sec, min, hour, mday, wday, mon_cent, year;
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unsigned long status;
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status = readb(&rtc->status);
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if ((status & RTC_STATE_RUN) != RTC_STATE_RUN) {
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printf("RTC doesn't run\n");
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return -1;
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}
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if ((status & RTC_STATE_BUSY) == RTC_STATE_BUSY)
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udelay(20);
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sec = readb(&rtc->second);
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min = readb(&rtc->minutes);
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hour = readb(&rtc->hours);
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mday = readb(&rtc->day);
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wday = readb(&rtc->dotw);
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mon_cent = readb(&rtc->month);
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year = readb(&rtc->year);
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debug("Get RTC year: %02lx mon/cent: %02lx mday: %02lx wday: %02lx "
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"hr: %02lx min: %02lx sec: %02lx\n",
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year, mon_cent, mday, wday,
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hour, min, sec);
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tmp->tm_sec = bcd2bin(sec & 0x7F);
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tmp->tm_min = bcd2bin(min & 0x7F);
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tmp->tm_hour = bcd2bin(hour & 0x3F);
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tmp->tm_mday = bcd2bin(mday & 0x3F);
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tmp->tm_mon = bcd2bin(mon_cent & 0x1F);
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tmp->tm_year = bcd2bin(year) + 2000;
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tmp->tm_wday = bcd2bin(wday & 0x07);
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tmp->tm_yday = 0;
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tmp->tm_isdst = 0;
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debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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return 0;
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}
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int rtc_set(struct rtc_time *tmp)
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{
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struct davinci_rtc *rtc = (struct davinci_rtc *)RTC_BASE;
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debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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writeb(bin2bcd(tmp->tm_year % 100), &rtc->year);
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writeb(bin2bcd(tmp->tm_mon), &rtc->month);
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writeb(bin2bcd(tmp->tm_wday), &rtc->dotw);
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writeb(bin2bcd(tmp->tm_mday), &rtc->day);
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writeb(bin2bcd(tmp->tm_hour), &rtc->hours);
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writeb(bin2bcd(tmp->tm_min), &rtc->minutes);
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writeb(bin2bcd(tmp->tm_sec), &rtc->second);
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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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struct davinci_rtc *rtc = (struct davinci_rtc *)RTC_BASE;
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/* run RTC counter */
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writeb(0x01, &rtc->ctrl);
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}
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