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https://github.com/AsahiLinux/u-boot
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On a board without hardware clock this software real time clock can be used. The build time is used to initialize the RTC. So you will have to adjust the time either manually using the 'date' command or use the 'sntp' to update the RTC with the time from a network time server. See CONFIG_CMD_SNTP and CONFIG_BOOTP_NTPSERVER. The RTC time is advanced according to CPU ticks. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*
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* This driver emulates a real time clock based on timer ticks.
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*/
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#include <common.h>
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#include <div64.h>
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#include <dm.h>
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#include <generated/timestamp_autogenerated.h>
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#include <rtc.h>
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/**
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* struct emul_rtc - private data for emulated RTC driver
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*/
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struct emul_rtc {
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/**
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* @offset_us: microseconds from 1970-01-01 to timer_get_us() base
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*/
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u64 offset_us;
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/**
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* @isdst: daylight saving time
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*/
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int isdst;
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};
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static int emul_rtc_get(struct udevice *dev, struct rtc_time *time)
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{
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struct emul_rtc *priv = dev_get_priv(dev);
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u64 now;
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if (!priv->offset_us) {
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/* Use the build date as initial time */
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priv->offset_us = U_BOOT_EPOCH * 1000000ULL - timer_get_us();
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priv->isdst = -1;
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}
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now = timer_get_us() + priv->offset_us;
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do_div(now, 1000000);
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rtc_to_tm(now, time);
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time->tm_isdst = priv->isdst;
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return 0;
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}
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static int emul_rtc_set(struct udevice *dev, const struct rtc_time *time)
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{
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struct emul_rtc *priv = dev_get_priv(dev);
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if (time->tm_year < 1970)
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return -EINVAL;
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priv->offset_us = rtc_mktime(time) * 1000000ULL - timer_get_us();
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if (time->tm_isdst > 0)
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priv->isdst = 1;
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else if (time->tm_isdst < 0)
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priv->isdst = -1;
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else
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priv->isdst = 0;
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return 0;
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}
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static const struct rtc_ops emul_rtc_ops = {
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.get = emul_rtc_get,
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.set = emul_rtc_set,
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};
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U_BOOT_DRIVER(rtc_emul) = {
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.name = "rtc_emul",
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.id = UCLASS_RTC,
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.ops = &emul_rtc_ops,
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.priv_auto_alloc_size = sizeof(struct emul_rtc),
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};
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U_BOOT_DEVICE(rtc_emul) = {
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.name = "rtc_emul",
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};
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