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https://github.com/brain-hackers/u-boot-brain
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9f9276c34c
Rename this function so that it is clear that it is provided by the RTC. Also return an error when it cannot function as expected. This is unlikely to occur since it works for dates since 1752 and many RTCs do not support such old dates. Still it is better to be accurate. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/*
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* Freescale i.MX27 RTC Driver
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*
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* Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <rtc.h>
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#include <asm/io.h>
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#include <asm/arch/imx-regs.h>
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#define HOUR_SHIFT 8
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#define HOUR_MASK 0x1f
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#define MIN_SHIFT 0
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#define MIN_MASK 0x3f
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int rtc_get(struct rtc_time *time)
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{
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struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
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uint32_t day, hour, min, sec;
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day = readl(&rtc_regs->dayr);
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hour = readl(&rtc_regs->hourmin);
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sec = readl(&rtc_regs->seconds);
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min = (hour >> MIN_SHIFT) & MIN_MASK;
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hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
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sec += min * 60 + hour * 3600 + day * 24 * 3600;
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rtc_to_tm(sec, time);
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return 0;
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}
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int rtc_set(struct rtc_time *time)
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{
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struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
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uint32_t day, hour, min, sec;
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sec = mktime(time->tm_year, time->tm_mon, time->tm_mday,
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time->tm_hour, time->tm_min, time->tm_sec);
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day = sec / (24 * 3600);
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sec = sec % (24 * 3600);
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hour = sec / 3600;
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sec = sec % 3600;
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min = sec / 60;
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sec = sec % 60;
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hour = (hour & HOUR_MASK) << HOUR_SHIFT;
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hour |= (min & MIN_MASK) << MIN_SHIFT;
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writel(day, &rtc_regs->dayr);
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writel(hour, &rtc_regs->hourmin);
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writel(sec, &rtc_regs->seconds);
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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 rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
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writel(0, &rtc_regs->dayr);
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writel(0, &rtc_regs->hourmin);
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writel(0, &rtc_regs->seconds);
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}
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