// SPDX-License-Identifier: GPL-2.0+ // // Copyright (C) 2011-2012 Freescale Semiconductor, Inc. #include <linux/init.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_wakeirq.h> #include <linux/rtc.h> #include <linux/clk.h> #include <linux/mfd/syscon.h> #include <linux/regmap.h> #define SNVS_LPREGISTER_OFFSET … /* These register offsets are relative to LP (Low Power) range */ #define SNVS_LPCR … #define SNVS_LPSR … #define SNVS_LPSRTCMR … #define SNVS_LPSRTCLR … #define SNVS_LPTAR … #define SNVS_LPPGDR … #define SNVS_LPCR_SRTC_ENV … #define SNVS_LPCR_LPTA_EN … #define SNVS_LPCR_LPWUI_EN … #define SNVS_LPSR_LPTA … #define SNVS_LPPGDR_INIT … #define CNTR_TO_SECS_SH … /* The maximum RTC clock cycles that are allowed to pass between two * consecutive clock counter register reads. If the values are corrupted a * bigger difference is expected. The RTC frequency is 32kHz. With 320 cycles * we end at 10ms which should be enough for most cases. If it once takes * longer than expected we do a retry. */ #define MAX_RTC_READ_DIFF_CYCLES … struct snvs_rtc_data { … }; /* Read 64 bit timer register, which could be in inconsistent state */ static u64 rtc_read_lpsrt(struct snvs_rtc_data *data) { … } /* Read the secure real time counter, taking care to deal with the cases of the * counter updating while being read. */ static u32 rtc_read_lp_counter(struct snvs_rtc_data *data) { … } /* Just read the lsb from the counter, dealing with inconsistent state */ static int rtc_read_lp_counter_lsb(struct snvs_rtc_data *data, u32 *lsb) { … } static int rtc_write_sync_lp(struct snvs_rtc_data *data) { … } static int snvs_rtc_enable(struct snvs_rtc_data *data, bool enable) { … } static int snvs_rtc_read_time(struct device *dev, struct rtc_time *tm) { … } static int snvs_rtc_set_time(struct device *dev, struct rtc_time *tm) { … } static int snvs_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static int snvs_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) { … } static int snvs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static const struct rtc_class_ops snvs_rtc_ops = …; static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id) { … } static const struct regmap_config snvs_rtc_config = …; static void snvs_rtc_action(void *data) { … } static int snvs_rtc_probe(struct platform_device *pdev) { … } static int __maybe_unused snvs_rtc_suspend_noirq(struct device *dev) { … } static int __maybe_unused snvs_rtc_resume_noirq(struct device *dev) { … } static const struct dev_pm_ops snvs_rtc_pm_ops = …; static const struct of_device_id snvs_dt_ids[] = …; MODULE_DEVICE_TABLE(of, snvs_dt_ids); static struct platform_driver snvs_rtc_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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