// SPDX-License-Identifier: GPL-2.0+ /* * Freescale STMP37XX/STMP378X Real Time Clock driver * * Copyright (c) 2007 Sigmatel, Inc. * Peter Hartley, <[email protected]> * * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved. * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. * Copyright 2011 Wolfram Sang, Pengutronix e.K. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/io.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/rtc.h> #include <linux/slab.h> #include <linux/of.h> #include <linux/stmp_device.h> #include <linux/stmp3xxx_rtc_wdt.h> #define STMP3XXX_RTC_CTRL … #define STMP3XXX_RTC_CTRL_ALARM_IRQ_EN … #define STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN … #define STMP3XXX_RTC_CTRL_ALARM_IRQ … #define STMP3XXX_RTC_CTRL_WATCHDOGEN … #define STMP3XXX_RTC_STAT … #define STMP3XXX_RTC_STAT_STALE_SHIFT … #define STMP3XXX_RTC_STAT_RTC_PRESENT … #define STMP3XXX_RTC_STAT_XTAL32000_PRESENT … #define STMP3XXX_RTC_STAT_XTAL32768_PRESENT … #define STMP3XXX_RTC_SECONDS … #define STMP3XXX_RTC_ALARM … #define STMP3XXX_RTC_WATCHDOG … #define STMP3XXX_RTC_PERSISTENT0 … #define STMP3XXX_RTC_PERSISTENT0_CLOCKSOURCE … #define STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN … #define STMP3XXX_RTC_PERSISTENT0_ALARM_EN … #define STMP3XXX_RTC_PERSISTENT0_XTAL24MHZ_PWRUP … #define STMP3XXX_RTC_PERSISTENT0_XTAL32KHZ_PWRUP … #define STMP3XXX_RTC_PERSISTENT0_XTAL32_FREQ … #define STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE … #define STMP3XXX_RTC_PERSISTENT1 … /* missing bitmask in headers */ #define STMP3XXX_RTC_PERSISTENT1_FORCE_UPDATER … struct stmp3xxx_rtc_data { … }; #if IS_ENABLED(CONFIG_STMP3XXX_RTC_WATCHDOG) /** * stmp3xxx_wdt_set_timeout - configure the watchdog inside the STMP3xxx RTC * @dev: the parent device of the watchdog (= the RTC) * @timeout: the desired value for the timeout register of the watchdog. * 0 disables the watchdog * * The watchdog needs one register and two bits which are in the RTC domain. * To handle the resource conflict, the RTC driver will create another * platform_device for the watchdog driver as a child of the RTC device. * The watchdog driver is passed the below accessor function via platform_data * to configure the watchdog. Locking is not needed because accessing SET/CLR * registers is atomic. */ static void stmp3xxx_wdt_set_timeout(struct device *dev, u32 timeout) { … } static struct stmp3xxx_wdt_pdata wdt_pdata = …; static void stmp3xxx_wdt_register(struct platform_device *rtc_pdev) { … } #else static void stmp3xxx_wdt_register(struct platform_device *rtc_pdev) { } #endif /* CONFIG_STMP3XXX_RTC_WATCHDOG */ static int stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data) { … } /* Time read/write */ static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) { … } static int stmp3xxx_rtc_settime(struct device *dev, struct rtc_time *rtc_tm) { … } /* interrupt(s) handler */ static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id) { … } static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled) { … } static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) { … } static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) { … } static const struct rtc_class_ops stmp3xxx_rtc_ops = …; static void stmp3xxx_rtc_remove(struct platform_device *pdev) { … } static int stmp3xxx_rtc_probe(struct platform_device *pdev) { … } #ifdef CONFIG_PM_SLEEP static int stmp3xxx_rtc_suspend(struct device *dev) { … } static int stmp3xxx_rtc_resume(struct device *dev) { … } #endif static SIMPLE_DEV_PM_OPS(stmp3xxx_rtc_pm_ops, stmp3xxx_rtc_suspend, stmp3xxx_rtc_resume); static const struct of_device_id rtc_dt_ids[] = …; MODULE_DEVICE_TABLE(of, rtc_dt_ids); static struct platform_driver stmp3xxx_rtcdrv = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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