151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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* Copyright (C) 2015 Amlogic, Inc. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/time64.h>
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struct meson_vrtc_data {
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void __iomem *io_alarm;
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struct rtc_device *rtc;
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unsigned long alarm_time;
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bool enabled;
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};
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static int meson_vrtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct timespec64 time;
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dev_dbg(dev, "%s\n", __func__);
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ktime_get_real_ts64(&time);
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rtc_time64_to_tm(time.tv_sec, tm);
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return 0;
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}
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static void meson_vrtc_set_wakeup_time(struct meson_vrtc_data *vrtc,
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unsigned long time)
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{
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writel_relaxed(time, vrtc->io_alarm);
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}
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static int meson_vrtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
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dev_dbg(dev, "%s: alarm->enabled=%d\n", __func__, alarm->enabled);
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if (alarm->enabled)
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vrtc->alarm_time = rtc_tm_to_time64(&alarm->time);
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else
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vrtc->alarm_time = 0;
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return 0;
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}
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static int meson_vrtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
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vrtc->enabled = enabled;
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return 0;
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}
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static const struct rtc_class_ops meson_vrtc_ops = {
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.read_time = meson_vrtc_read_time,
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.set_alarm = meson_vrtc_set_alarm,
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.alarm_irq_enable = meson_vrtc_alarm_irq_enable,
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};
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static int meson_vrtc_probe(struct platform_device *pdev)
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{
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struct meson_vrtc_data *vrtc;
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vrtc = devm_kzalloc(&pdev->dev, sizeof(*vrtc), GFP_KERNEL);
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if (!vrtc)
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return -ENOMEM;
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vrtc->io_alarm = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(vrtc->io_alarm))
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return PTR_ERR(vrtc->io_alarm);
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device_init_wakeup(&pdev->dev, 1);
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platform_set_drvdata(pdev, vrtc);
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vrtc->rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(vrtc->rtc))
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return PTR_ERR(vrtc->rtc);
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vrtc->rtc->ops = &meson_vrtc_ops;
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return devm_rtc_register_device(vrtc->rtc);
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}
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static int __maybe_unused meson_vrtc_suspend(struct device *dev)
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{
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struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
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dev_dbg(dev, "%s\n", __func__);
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if (vrtc->alarm_time) {
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unsigned long local_time;
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long alarm_secs;
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struct timespec64 time;
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ktime_get_real_ts64(&time);
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local_time = time.tv_sec;
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dev_dbg(dev, "alarm_time = %lus, local_time=%lus\n",
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vrtc->alarm_time, local_time);
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alarm_secs = vrtc->alarm_time - local_time;
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if (alarm_secs > 0) {
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meson_vrtc_set_wakeup_time(vrtc, alarm_secs);
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dev_dbg(dev, "system will wakeup in %lds.\n",
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alarm_secs);
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} else {
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dev_err(dev, "alarm time already passed: %lds.\n",
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alarm_secs);
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}
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}
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return 0;
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}
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static int __maybe_unused meson_vrtc_resume(struct device *dev)
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{
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struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
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dev_dbg(dev, "%s\n", __func__);
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vrtc->alarm_time = 0;
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meson_vrtc_set_wakeup_time(vrtc, 0);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(meson_vrtc_pm_ops,
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meson_vrtc_suspend, meson_vrtc_resume);
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static const struct of_device_id meson_vrtc_dt_match[] = {
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{ .compatible = "amlogic,meson-vrtc"},
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{},
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};
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MODULE_DEVICE_TABLE(of, meson_vrtc_dt_match);
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static struct platform_driver meson_vrtc_driver = {
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.probe = meson_vrtc_probe,
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.driver = {
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.name = "meson-vrtc",
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.of_match_table = meson_vrtc_dt_match,
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.pm = &meson_vrtc_pm_ops,
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},
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};
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module_platform_driver(meson_vrtc_driver);
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MODULE_DESCRIPTION("Amlogic Virtual Wakeup RTC Timer driver");
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MODULE_LICENSE("GPL");
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