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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
- *
- * This driver emulates a real time clock based on timer ticks.
- */
- #include <common.h>
- #include <div64.h>
- #include <dm.h>
- #include <env.h>
- #include <generated/timestamp_autogenerated.h>
- #include <rtc.h>
- /**
- * struct emul_rtc - private data for emulated RTC driver
- */
- struct emul_rtc {
- /**
- * @offset_us: microseconds from 1970-01-01 to timer_get_us() base
- */
- u64 offset_us;
- /**
- * @isdst: daylight saving time
- */
- int isdst;
- };
- static int emul_rtc_get(struct udevice *dev, struct rtc_time *time)
- {
- struct emul_rtc *priv = dev_get_priv(dev);
- u64 now;
- now = timer_get_us() + priv->offset_us;
- do_div(now, 1000000);
- rtc_to_tm(now, time);
- time->tm_isdst = priv->isdst;
- return 0;
- }
- static int emul_rtc_set(struct udevice *dev, const struct rtc_time *time)
- {
- struct emul_rtc *priv = dev_get_priv(dev);
- if (time->tm_year < 1970)
- return -EINVAL;
- priv->offset_us = rtc_mktime(time) * 1000000ULL - timer_get_us();
- if (time->tm_isdst > 0)
- priv->isdst = 1;
- else if (time->tm_isdst < 0)
- priv->isdst = -1;
- else
- priv->isdst = 0;
- return 0;
- }
- int emul_rtc_probe(struct udevice *dev)
- {
- struct emul_rtc *priv = dev_get_priv(dev);
- const char *epoch_str;
- u64 epoch;
- epoch_str = env_get("rtc_emul_epoch");
- if (epoch_str) {
- epoch = simple_strtoull(epoch_str, NULL, 10);
- } else {
- /* Use the build date as initial time */
- epoch = U_BOOT_EPOCH;
- }
- priv->offset_us = epoch * 1000000ULL - timer_get_us();
- priv->isdst = -1;
- return 0;
- }
- static const struct rtc_ops emul_rtc_ops = {
- .get = emul_rtc_get,
- .set = emul_rtc_set,
- };
- U_BOOT_DRIVER(rtc_emul) = {
- .name = "rtc_emul",
- .id = UCLASS_RTC,
- .ops = &emul_rtc_ops,
- .probe = emul_rtc_probe,
- .priv_auto_alloc_size = sizeof(struct emul_rtc),
- };
- U_BOOT_DEVICE(rtc_emul) = {
- .name = "rtc_emul",
- };
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