// SPDX-License-Identifier: GPL-2.0 /* * Starfive Watchdog driver * * Copyright (C) 2022 StarFive Technology Co., Ltd. */ #include <linux/clk.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/reset.h> #include <linux/watchdog.h> /* JH7100 Watchdog register define */ #define STARFIVE_WDT_JH7100_INTSTAUS … #define STARFIVE_WDT_JH7100_CONTROL … #define STARFIVE_WDT_JH7100_LOAD … #define STARFIVE_WDT_JH7100_EN … #define STARFIVE_WDT_JH7100_RELOAD … #define STARFIVE_WDT_JH7100_VALUE … #define STARFIVE_WDT_JH7100_INTCLR … #define STARFIVE_WDT_JH7100_LOCK … /* JH7110 Watchdog register define */ #define STARFIVE_WDT_JH7110_LOAD … #define STARFIVE_WDT_JH7110_VALUE … #define STARFIVE_WDT_JH7110_CONTROL … #define STARFIVE_WDT_JH7110_INTCLR … #define STARFIVE_WDT_JH7110_IMS … #define STARFIVE_WDT_JH7110_LOCK … /* WDOGCONTROL */ #define STARFIVE_WDT_ENABLE … #define STARFIVE_WDT_EN_SHIFT … #define STARFIVE_WDT_RESET_EN … #define STARFIVE_WDT_JH7100_RST_EN_SHIFT … #define STARFIVE_WDT_JH7110_RST_EN_SHIFT … /* WDOGLOCK */ #define STARFIVE_WDT_JH7100_UNLOCK_KEY … #define STARFIVE_WDT_JH7110_UNLOCK_KEY … /* WDOGINTCLR */ #define STARFIVE_WDT_INTCLR … #define STARFIVE_WDT_JH7100_INTCLR_AVA_SHIFT … #define STARFIVE_WDT_MAXCNT … #define STARFIVE_WDT_DEFAULT_TIME … #define STARFIVE_WDT_DELAY_US … #define STARFIVE_WDT_TIMEOUT_US … /* module parameter */ #define STARFIVE_WDT_EARLY_ENA … static bool nowayout = … WATCHDOG_NOWAYOUT; static int heartbeat; static bool early_enable = …; module_param(heartbeat, int, 0); module_param(early_enable, bool, 0); module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; MODULE_PARM_DESC(…) …; MODULE_PARM_DESC(…) …; struct starfive_wdt_variant { … }; struct starfive_wdt { … }; /* Register layout and configuration for the JH7100 */ static const struct starfive_wdt_variant starfive_wdt_jh7100_variant = …; /* Register layout and configuration for the JH7110 */ static const struct starfive_wdt_variant starfive_wdt_jh7110_variant = …; static int starfive_wdt_enable_clock(struct starfive_wdt *wdt) { … } static void starfive_wdt_disable_clock(struct starfive_wdt *wdt) { … } static inline int starfive_wdt_get_clock(struct starfive_wdt *wdt) { … } static inline int starfive_wdt_reset_init(struct device *dev) { … } static u32 starfive_wdt_ticks_to_sec(struct starfive_wdt *wdt, u32 ticks) { … } /* Write unlock-key to unlock. Write other value to lock. */ static void starfive_wdt_unlock(struct starfive_wdt *wdt) __acquires(&wdt->lock) { … } static void starfive_wdt_lock(struct starfive_wdt *wdt) __releases(&wdt->lock) { … } /* enable watchdog interrupt to reset/reboot */ static void starfive_wdt_enable_reset(struct starfive_wdt *wdt) { … } /* interrupt status whether has been raised from the counter */ static bool starfive_wdt_raise_irq_status(struct starfive_wdt *wdt) { … } /* waiting interrupt can be free to clear */ static int starfive_wdt_wait_int_free(struct starfive_wdt *wdt) { … } /* clear interrupt signal before initialization or reload */ static int starfive_wdt_int_clr(struct starfive_wdt *wdt) { … } static inline void starfive_wdt_set_count(struct starfive_wdt *wdt, u32 val) { … } static inline u32 starfive_wdt_get_count(struct starfive_wdt *wdt) { … } /* enable watchdog */ static inline void starfive_wdt_enable(struct starfive_wdt *wdt) { … } /* disable watchdog */ static inline void starfive_wdt_disable(struct starfive_wdt *wdt) { … } static inline void starfive_wdt_set_reload_count(struct starfive_wdt *wdt, u32 count) { … } static unsigned int starfive_wdt_max_timeout(struct starfive_wdt *wdt) { … } static unsigned int starfive_wdt_get_timeleft(struct watchdog_device *wdd) { … } static int starfive_wdt_keepalive(struct watchdog_device *wdd) { … } static int starfive_wdt_start(struct starfive_wdt *wdt) { … } static void starfive_wdt_stop(struct starfive_wdt *wdt) { … } static int starfive_wdt_pm_start(struct watchdog_device *wdd) { … } static int starfive_wdt_pm_stop(struct watchdog_device *wdd) { … } static int starfive_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout) { … } #define STARFIVE_WDT_OPTIONS … static const struct watchdog_info starfive_wdt_info = …; static const struct watchdog_ops starfive_wdt_ops = …; static int starfive_wdt_probe(struct platform_device *pdev) { … } static void starfive_wdt_remove(struct platform_device *pdev) { … } static void starfive_wdt_shutdown(struct platform_device *pdev) { … } static int starfive_wdt_suspend(struct device *dev) { … } static int starfive_wdt_resume(struct device *dev) { … } static int starfive_wdt_runtime_suspend(struct device *dev) { … } static int starfive_wdt_runtime_resume(struct device *dev) { … } static const struct dev_pm_ops starfive_wdt_pm_ops = …; static const struct of_device_id starfive_wdt_match[] = …; MODULE_DEVICE_TABLE(of, starfive_wdt_match); static struct platform_driver starfive_wdt_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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