// SPDX-License-Identifier: GPL-2.0 /* * Real Time Clock (RTC) Driver for i.MX53 * Copyright (c) 2004-2011 Freescale Semiconductor, Inc. * Copyright (c) 2017 Beckhoff Automation GmbH & Co. KG */ #include <linux/clk.h> #include <linux/io.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/platform_device.h> #include <linux/pm_wakeirq.h> #include <linux/rtc.h> #define SRTC_LPPDR_INIT … #define SRTC_LPCR_EN_LP … #define SRTC_LPCR_WAE … #define SRTC_LPCR_ALP … #define SRTC_LPCR_NSA … #define SRTC_LPCR_NVE … #define SRTC_LPCR_IE … #define SRTC_LPSR_ALP … #define SRTC_LPSR_NVES … #define SRTC_LPSR_IES … #define SRTC_LPSCMR … #define SRTC_LPSCLR … #define SRTC_LPSAR … #define SRTC_LPCR … #define SRTC_LPSR … #define SRTC_LPPDR … /* max. number of retries to read registers, 120 was max during test */ #define REG_READ_TIMEOUT … struct mxc_rtc_data { … }; /* * This function does write synchronization for writes to the lp srtc block. * To take care of the asynchronous CKIL clock, all writes from the IP domain * will be synchronized to the CKIL domain. * The caller should hold the pdata->lock */ static void mxc_rtc_sync_lp_locked(struct device *dev, void __iomem *ioaddr) { … } /* This function is the RTC interrupt service routine. */ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id) { … } /* * Enable clk and aquire spinlock * @return 0 if successful; non-zero otherwise. */ static int mxc_rtc_lock(struct mxc_rtc_data *const pdata) { … } static int mxc_rtc_unlock(struct mxc_rtc_data *const pdata) { … } /* * This function reads the current RTC time into tm in Gregorian date. * * @param tm contains the RTC time value upon return * * @return 0 if successful; non-zero otherwise. */ static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm) { … } /* * This function sets the internal RTC time based on tm in Gregorian date. * * @param tm the time value to be set in the RTC * * @return 0 if successful; non-zero otherwise. */ static int mxc_rtc_set_time(struct device *dev, struct rtc_time *tm) { … } /* * This function reads the current alarm value into the passed in \b alrm * argument. It updates the \b alrm's pending field value based on the whether * an alarm interrupt occurs or not. * * @param alrm contains the RTC alarm value upon return * * @return 0 if successful; non-zero otherwise. */ static int mxc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { … } /* * Enable/Disable alarm interrupt * The caller should hold the pdata->lock */ static void mxc_rtc_alarm_irq_enable_locked(struct mxc_rtc_data *pdata, unsigned int enable) { … } static int mxc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) { … } /* * This function sets the RTC alarm based on passed in alrm. * * @param alrm the alarm value to be set in the RTC * * @return 0 if successful; non-zero otherwise. */ static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static const struct rtc_class_ops mxc_rtc_ops = …; static int mxc_rtc_wait_for_flag(void __iomem *ioaddr, int flag) { … } static int mxc_rtc_probe(struct platform_device *pdev) { … } static void mxc_rtc_remove(struct platform_device *pdev) { … } static const struct of_device_id mxc_ids[] = …; MODULE_DEVICE_TABLE(of, mxc_ids); static struct platform_driver mxc_rtc_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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