// SPDX-License-Identifier: GPL-2.0 /* * Texas Instruments K3 RTC driver * * Copyright (C) 2021-2022 Texas Instruments Incorporated - https://www.ti.com/ */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/sys_soc.h> #include <linux/property.h> #include <linux/regmap.h> #include <linux/rtc.h> /* Registers */ #define REG_K3RTC_S_CNT_LSW … #define REG_K3RTC_S_CNT_MSW … #define REG_K3RTC_COMP … #define REG_K3RTC_ON_OFF_S_CNT_LSW … #define REG_K3RTC_ON_OFF_S_CNT_MSW … #define REG_K3RTC_SCRATCH0 … #define REG_K3RTC_SCRATCH7 … #define REG_K3RTC_GENERAL_CTL … #define REG_K3RTC_IRQSTATUS_RAW_SYS … #define REG_K3RTC_IRQSTATUS_SYS … #define REG_K3RTC_IRQENABLE_SET_SYS … #define REG_K3RTC_IRQENABLE_CLR_SYS … #define REG_K3RTC_SYNCPEND … #define REG_K3RTC_KICK0 … #define REG_K3RTC_KICK1 … /* Freeze when lsw is read and unfreeze when msw is read */ #define K3RTC_CNT_FMODE_S_CNT_VALUE … /* Magic values for lock/unlock */ #define K3RTC_KICK0_UNLOCK_VALUE … #define K3RTC_KICK1_UNLOCK_VALUE … /* Multiplier for ppb conversions */ #define K3RTC_PPB_MULT … /* Min and max values supported with 'offset' interface (swapped sign) */ #define K3RTC_MIN_OFFSET … #define K3RTC_MAX_OFFSET … static const struct regmap_config ti_k3_rtc_regmap_config = …; enum ti_k3_rtc_fields { … }; static const struct reg_field ti_rtc_reg_fields[] = …; /** * struct ti_k3_rtc - Private data for ti-k3-rtc * @irq: IRQ * @sync_timeout_us: data sync timeout period in uSec * @rate_32k: 32k clock rate in Hz * @rtc_dev: rtc device * @regmap: rtc mmio regmap * @r_fields: rtc register fields */ struct ti_k3_rtc { … }; static int k3rtc_field_read(struct ti_k3_rtc *priv, enum ti_k3_rtc_fields f) { … } static void k3rtc_field_write(struct ti_k3_rtc *priv, enum ti_k3_rtc_fields f, u32 val) { … } /** * k3rtc_fence - Ensure a register sync took place between the two domains * @priv: pointer to priv data * * Return: 0 if the sync took place, else returns -ETIMEDOUT */ static int k3rtc_fence(struct ti_k3_rtc *priv) { … } static inline int k3rtc_check_unlocked(struct ti_k3_rtc *priv) { … } static int k3rtc_unlock_rtc(struct ti_k3_rtc *priv) { … } /* * This is the list of SoCs affected by TI's i2327 errata causing the RTC * state-machine to break if not unlocked fast enough during boot. These * SoCs must have the bootloader unlock this device very early in the * boot-flow before we (Linux) can use this device. */ static const struct soc_device_attribute has_erratum_i2327[] = …; static int k3rtc_configure(struct device *dev) { … } static int ti_k3_rtc_read_time(struct device *dev, struct rtc_time *tm) { … } static int ti_k3_rtc_set_time(struct device *dev, struct rtc_time *tm) { … } static int ti_k3_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { … } static int ti_k3_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) { … } static int ti_k3_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) { … } static int ti_k3_rtc_read_offset(struct device *dev, long *offset) { … } static int ti_k3_rtc_set_offset(struct device *dev, long offset) { … } static irqreturn_t ti_k3_rtc_interrupt(s32 irq, void *dev_id) { … } static const struct rtc_class_ops ti_k3_rtc_ops = …; static int ti_k3_rtc_scratch_read(void *priv_data, unsigned int offset, void *val, size_t bytes) { … } static int ti_k3_rtc_scratch_write(void *priv_data, unsigned int offset, void *val, size_t bytes) { … } static struct nvmem_config ti_k3_rtc_nvmem_config = …; static int k3rtc_get_32kclk(struct device *dev, struct ti_k3_rtc *priv) { … } static int k3rtc_get_vbusclk(struct device *dev, struct ti_k3_rtc *priv) { … } static int ti_k3_rtc_probe(struct platform_device *pdev) { … } static const struct of_device_id ti_k3_rtc_of_match_table[] = …; MODULE_DEVICE_TABLE(of, ti_k3_rtc_of_match_table); static int __maybe_unused ti_k3_rtc_suspend(struct device *dev) { … } static int __maybe_unused ti_k3_rtc_resume(struct device *dev) { … } static SIMPLE_DEV_PM_OPS(ti_k3_rtc_pm_ops, ti_k3_rtc_suspend, ti_k3_rtc_resume); static struct platform_driver ti_k3_rtc_driver = …; module_platform_driver(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …;
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