// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2019 BayLibre, SAS * Author: Neil Armstrong <narmstrong@baylibre.com> * Copyright (C) 2015 Amlogic, Inc. All rights reserved. */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/io.h> #include <linux/of.h> #include <linux/time64.h> struct meson_vrtc_data { void __iomem *io_alarm; struct rtc_device *rtc; unsigned long alarm_time; bool enabled; }; static int meson_vrtc_read_time(struct device *dev, struct rtc_time *tm) { struct timespec64 time; dev_dbg(dev, "%s\n", __func__); ktime_get_raw_ts64(&time); rtc_time64_to_tm(time.tv_sec, tm); return 0; } static void meson_vrtc_set_wakeup_time(struct meson_vrtc_data *vrtc, unsigned long time) { writel_relaxed(time, vrtc->io_alarm); } static int meson_vrtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) { struct meson_vrtc_data *vrtc = dev_get_drvdata(dev); dev_dbg(dev, "%s: alarm->enabled=%d\n", __func__, alarm->enabled); if (alarm->enabled) vrtc->alarm_time = rtc_tm_to_time64(&alarm->time); else vrtc->alarm_time = 0; return 0; } static int meson_vrtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct meson_vrtc_data *vrtc = dev_get_drvdata(dev); vrtc->enabled = enabled; return 0; } static const struct rtc_class_ops meson_vrtc_ops = { .read_time = meson_vrtc_read_time, .set_alarm = meson_vrtc_set_alarm, .alarm_irq_enable = meson_vrtc_alarm_irq_enable, }; static int meson_vrtc_probe(struct platform_device *pdev) { struct meson_vrtc_data *vrtc; vrtc = devm_kzalloc(&pdev->dev, sizeof(*vrtc), GFP_KERNEL); if (!vrtc) return -ENOMEM; vrtc->io_alarm = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(vrtc->io_alarm)) return PTR_ERR(vrtc->io_alarm); device_init_wakeup(&pdev->dev, 1); platform_set_drvdata(pdev, vrtc); vrtc->rtc = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(vrtc->rtc)) return PTR_ERR(vrtc->rtc); vrtc->rtc->ops = &meson_vrtc_ops; return rtc_register_device(vrtc->rtc); } static int __maybe_unused meson_vrtc_suspend(struct device *dev) { struct meson_vrtc_data *vrtc = dev_get_drvdata(dev); dev_dbg(dev, "%s\n", __func__); if (vrtc->alarm_time) { unsigned long local_time; long alarm_secs; struct timespec64 time; ktime_get_raw_ts64(&time); local_time = time.tv_sec; dev_dbg(dev, "alarm_time = %lus, local_time=%lus\n", vrtc->alarm_time, local_time); alarm_secs = vrtc->alarm_time - local_time; if (alarm_secs > 0) { meson_vrtc_set_wakeup_time(vrtc, alarm_secs); dev_dbg(dev, "system will wakeup in %lds.\n", alarm_secs); } else { dev_err(dev, "alarm time already passed: %lds.\n", alarm_secs); } } return 0; } static int __maybe_unused meson_vrtc_resume(struct device *dev) { struct meson_vrtc_data *vrtc = dev_get_drvdata(dev); dev_dbg(dev, "%s\n", __func__); vrtc->alarm_time = 0; meson_vrtc_set_wakeup_time(vrtc, 0); return 0; } static SIMPLE_DEV_PM_OPS(meson_vrtc_pm_ops, meson_vrtc_suspend, meson_vrtc_resume); static const struct of_device_id meson_vrtc_dt_match[] = { { .compatible = "amlogic,meson-vrtc"}, {}, }; MODULE_DEVICE_TABLE(of, meson_vrtc_dt_match); static struct platform_driver meson_vrtc_driver = { .probe = meson_vrtc_probe, .driver = { .name = "meson-vrtc", .of_match_table = meson_vrtc_dt_match, .pm = &meson_vrtc_pm_ops, }, }; module_platform_driver(meson_vrtc_driver); MODULE_DESCRIPTION("Amlogic Virtual Wakeup RTC Timer driver"); MODULE_LICENSE("GPL");