// SPDX-License-Identifier: GPL-2.0-only /* * RTC driver for Rockchip RK808 * * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd * * Author: Chris Zhong <[email protected]> * Author: Zhang Qing <[email protected]> */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/mfd/rk808.h> #include <linux/platform_device.h> /* RTC_CTRL_REG bitfields */ #define BIT_RTC_CTRL_REG_STOP_RTC_M … /* RK808 has a shadowed register for saving a "frozen" RTC time. * When user setting "GET_TIME" to 1, the time will save in this shadowed * register. If set "READSEL" to 1, user read rtc time register, actually * get the time of that moment. If we need the real time, clr this bit. */ #define BIT_RTC_CTRL_REG_RTC_GET_TIME … #define BIT_RTC_CTRL_REG_RTC_READSEL_M … #define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M … #define RTC_STATUS_MASK … #define SECONDS_REG_MSK … #define MINUTES_REG_MAK … #define HOURS_REG_MSK … #define DAYS_REG_MSK … #define MONTHS_REG_MSK … #define YEARS_REG_MSK … #define WEEKS_REG_MSK … /* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */ #define NUM_TIME_REGS … #define NUM_ALARM_REGS … struct rk_rtc_compat_reg { … }; struct rk808_rtc { … }; /* * The Rockchip calendar used by the RK808 counts November with 31 days. We use * these translation functions to convert its dates to/from the Gregorian * calendar used by the rest of the world. We arbitrarily define Jan 1st, 2016 * as the day when both calendars were in sync, and treat all other dates * relative to that. * NOTE: Other system software (e.g. firmware) that reads the same hardware must * implement this exact same conversion algorithm, with the same anchor date. */ static time64_t nov2dec_transitions(struct rtc_time *tm) { … } static void rockchip_to_gregorian(struct rtc_time *tm) { … } static void gregorian_to_rockchip(struct rtc_time *tm) { … } /* Read current time and date in RTC */ static int rk808_rtc_readtime(struct device *dev, struct rtc_time *tm) { … } /* Set current time and date in RTC */ static int rk808_rtc_set_time(struct device *dev, struct rtc_time *tm) { … } /* Read alarm time and date in RTC */ static int rk808_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc) { … } static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc) { … } static int rk808_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) { … } static int rk808_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { … } /* * We will just handle setting the frequency and make use the framework for * reading the periodic interupts. * * @freq: Current periodic IRQ freq: * bit 0: every second * bit 1: every minute * bit 2: every hour * bit 3: every day */ static irqreturn_t rk808_alarm_irq(int irq, void *data) { … } static const struct rtc_class_ops rk808_rtc_ops = …; #ifdef CONFIG_PM_SLEEP /* Turn off the alarm if it should not be a wake source. */ static int rk808_rtc_suspend(struct device *dev) { … } /* Enable the alarm if it should be enabled (in case it was disabled to * prevent use as a wake source). */ static int rk808_rtc_resume(struct device *dev) { … } #endif static SIMPLE_DEV_PM_OPS(rk808_rtc_pm_ops, rk808_rtc_suspend, rk808_rtc_resume); static struct rk_rtc_compat_reg rk808_creg = …; static struct rk_rtc_compat_reg rk817_creg = …; static int rk808_rtc_probe(struct platform_device *pdev) { … } static struct platform_driver rk808_rtc_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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