// SPDX-License-Identifier: GPL-2.0-or-later /* * rtc-twl.c -- TWL Real Time Clock interface * * Copyright (C) 2007 MontaVista Software, Inc * Author: Alexandre Rusev <[email protected]> * * Based on original TI driver twl4030-rtc.c * Copyright (C) 2006 Texas Instruments, Inc. * * Based on rtc-omap.c * Copyright (C) 2003 MontaVista Software, Inc. * Author: George G. Davis <[email protected]> or <[email protected]> * Copyright (C) 2006 David Brownell */ #define pr_fmt(fmt) … #include <linux/kernel.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/module.h> #include <linux/types.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/of.h> #include <linux/mfd/twl.h> enum twl_class { … }; /* * RTC block register offsets (use TWL_MODULE_RTC) */ enum { … }; static const u8 twl4030_rtc_reg_map[] = …; static const u8 twl6030_rtc_reg_map[] = …; /* RTC_CTRL_REG bitfields */ #define BIT_RTC_CTRL_REG_STOP_RTC_M … #define BIT_RTC_CTRL_REG_ROUND_30S_M … #define BIT_RTC_CTRL_REG_AUTO_COMP_M … #define BIT_RTC_CTRL_REG_MODE_12_24_M … #define BIT_RTC_CTRL_REG_TEST_MODE_M … #define BIT_RTC_CTRL_REG_SET_32_COUNTER_M … #define BIT_RTC_CTRL_REG_GET_TIME_M … #define BIT_RTC_CTRL_REG_RTC_V_OPT … /* RTC_STATUS_REG bitfields */ #define BIT_RTC_STATUS_REG_RUN_M … #define BIT_RTC_STATUS_REG_1S_EVENT_M … #define BIT_RTC_STATUS_REG_1M_EVENT_M … #define BIT_RTC_STATUS_REG_1H_EVENT_M … #define BIT_RTC_STATUS_REG_1D_EVENT_M … #define BIT_RTC_STATUS_REG_ALARM_M … #define BIT_RTC_STATUS_REG_POWER_UP_M … /* RTC_INTERRUPTS_REG bitfields */ #define BIT_RTC_INTERRUPTS_REG_EVERY_M … #define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M … #define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M … /* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */ #define ALL_TIME_REGS … /*----------------------------------------------------------------------*/ struct twl_rtc { … }; /* * Supports 1 byte read from TWL RTC register. */ static int twl_rtc_read_u8(struct twl_rtc *twl_rtc, u8 *data, u8 reg) { … } /* * Supports 1 byte write to TWL RTC registers. */ static int twl_rtc_write_u8(struct twl_rtc *twl_rtc, u8 data, u8 reg) { … } /* * Enable 1/second update and/or alarm interrupts. */ static int set_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit) { … } /* * Disable update and/or alarm interrupts. */ static int mask_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit) { … } static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) { … } /* * Gets current TWL RTC time and date parameters. * * The RTC's time/alarm representation is not what gmtime(3) requires * Linux to use: * * - Months are 1..12 vs Linux 0-11 * - Years are 0..99 vs Linux 1900..N (we assume 21st century) */ static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm) { … } static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm) { … } /* * Gets current TWL RTC alarm time. */ static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) { … } static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) { … } static irqreturn_t twl_rtc_interrupt(int irq, void *data) { … } static const struct rtc_class_ops twl_rtc_ops = …; static int twl_nvram_read(void *priv, unsigned int offset, void *val, size_t bytes) { … } static int twl_nvram_write(void *priv, unsigned int offset, void *val, size_t bytes) { … } /*----------------------------------------------------------------------*/ static int twl_rtc_probe(struct platform_device *pdev) { … } /* * Disable all TWL RTC module interrupts. * Sets status flag to free. */ static void twl_rtc_remove(struct platform_device *pdev) { … } static void twl_rtc_shutdown(struct platform_device *pdev) { … } #ifdef CONFIG_PM_SLEEP static int twl_rtc_suspend(struct device *dev) { … } static int twl_rtc_resume(struct device *dev) { … } #endif static SIMPLE_DEV_PM_OPS(twl_rtc_pm_ops, twl_rtc_suspend, twl_rtc_resume); static const struct of_device_id twl_rtc_of_match[] = …; MODULE_DEVICE_TABLE(of, twl_rtc_of_match); static struct platform_driver twl4030rtc_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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