// SPDX-License-Identifier: GPL-2.0 /* * Watchdog driver for IMX2 and later processors * * Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <[email protected]> * Copyright (C) 2014 Freescale Semiconductor, Inc. * * some parts adapted by similar drivers from Darius Augulis and Vladimir * Zapolskiy, additional improvements by Wim Van Sebroeck. * * NOTE: MX1 has a slightly different Watchdog than MX2 and later: * * MX1: MX2+: * ---- ----- * Registers: 32-bit 16-bit * Stopable timer: Yes No * Need to enable clk: No Yes * Halt on suspend: Manual Can be automatic */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/watchdog.h> #define DRIVER_NAME … #define IMX2_WDT_WCR … #define IMX2_WDT_WCR_WT … #define IMX2_WDT_WCR_WDW … #define IMX2_WDT_WCR_WDA … #define IMX2_WDT_WCR_SRS … #define IMX2_WDT_WCR_WRE … #define IMX2_WDT_WCR_WDE … #define IMX2_WDT_WCR_WDZST … #define IMX2_WDT_WSR … #define IMX2_WDT_SEQ1 … #define IMX2_WDT_SEQ2 … #define IMX2_WDT_WRSR … #define IMX2_WDT_WRSR_TOUT … #define IMX2_WDT_WICR … #define IMX2_WDT_WICR_WIE … #define IMX2_WDT_WICR_WTIS … #define IMX2_WDT_WICR_WICT … #define IMX2_WDT_WMCR … #define IMX2_WDT_MAX_TIME … #define IMX2_WDT_DEFAULT_TIME … #define WDOG_SEC_TO_COUNT(s) … struct imx2_wdt_data { … }; struct imx2_wdt_device { … }; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; static unsigned timeout; module_param(timeout, uint, 0); MODULE_PARM_DESC(…) …; static const struct watchdog_info imx2_wdt_info = …; static const struct watchdog_info imx2_wdt_pretimeout_info = …; static int imx2_wdt_restart(struct watchdog_device *wdog, unsigned long action, void *data) { … } static inline void imx2_wdt_setup(struct watchdog_device *wdog) { … } static inline bool imx2_wdt_is_running(struct imx2_wdt_device *wdev) { … } static int imx2_wdt_ping(struct watchdog_device *wdog) { … } static void __imx2_wdt_set_timeout(struct watchdog_device *wdog, unsigned int new_timeout) { … } static int imx2_wdt_set_timeout(struct watchdog_device *wdog, unsigned int new_timeout) { … } static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog, unsigned int new_pretimeout) { … } static irqreturn_t imx2_wdt_isr(int irq, void *wdog_arg) { … } static int imx2_wdt_start(struct watchdog_device *wdog) { … } static const struct watchdog_ops imx2_wdt_ops = …; static const struct regmap_config imx2_wdt_regmap_config = …; static void imx2_wdt_action(void *data) { … } static int __init imx2_wdt_probe(struct platform_device *pdev) { … } static void imx2_wdt_shutdown(struct platform_device *pdev) { … } /* Disable watchdog if it is active or non-active but still running */ static int __maybe_unused imx2_wdt_suspend(struct device *dev) { … } /* Enable watchdog and configure it if necessary */ static int __maybe_unused imx2_wdt_resume(struct device *dev) { … } static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend, imx2_wdt_resume); static struct imx2_wdt_data imx_wdt = …; static struct imx2_wdt_data imx_wdt_legacy = …; static const struct of_device_id imx2_wdt_dt_ids[] = …; MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids); static struct platform_driver imx2_wdt_driver = …; module_platform_driver_probe(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
Codebase Browser
linux