// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/watchdog.h> /* minimum and maximum watchdog trigger timeout, in seconds */ #define MIN_WDT_TIMEOUT … #define MAX_WDT_TIMEOUT … /* * Base of the WDT registers, from the timer base address. There are * actually 5 watchdogs that can be configured (by pairing with an available * timer), at bases 0x100 + (WDT ID) * 0x20, where WDT ID is 0 through 4. * This driver only configures the first watchdog (WDT ID 0). */ #define WDT_BASE … #define WDT_ID … /* * Register base of the timer that's selected for pairing with the watchdog. * This driver arbitrarily uses timer 5, which is currently unused by * other drivers (in particular, the Tegra clocksource driver). If this * needs to change, take care that the new timer is not used by the * clocksource driver. */ #define WDT_TIMER_BASE … #define WDT_TIMER_ID … /* WDT registers */ #define WDT_CFG … #define WDT_CFG_PERIOD_SHIFT … #define WDT_CFG_PERIOD_MASK … #define WDT_CFG_INT_EN … #define WDT_CFG_PMC2CAR_RST_EN … #define WDT_STS … #define WDT_STS_COUNT_SHIFT … #define WDT_STS_COUNT_MASK … #define WDT_STS_EXP_SHIFT … #define WDT_STS_EXP_MASK … #define WDT_CMD … #define WDT_CMD_START_COUNTER … #define WDT_CMD_DISABLE_COUNTER … #define WDT_UNLOCK … #define WDT_UNLOCK_PATTERN … /* Timer registers */ #define TIMER_PTV … #define TIMER_EN … #define TIMER_PERIODIC … struct tegra_wdt { … }; #define WDT_HEARTBEAT … static int heartbeat = …; module_param(heartbeat, int, 0); MODULE_PARM_DESC(…) …; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; static int tegra_wdt_start(struct watchdog_device *wdd) { … } static int tegra_wdt_stop(struct watchdog_device *wdd) { … } static int tegra_wdt_ping(struct watchdog_device *wdd) { … } static int tegra_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout) { … } static unsigned int tegra_wdt_get_timeleft(struct watchdog_device *wdd) { … } static const struct watchdog_info tegra_wdt_info = …; static const struct watchdog_ops tegra_wdt_ops = …; static int tegra_wdt_probe(struct platform_device *pdev) { … } static int tegra_wdt_suspend(struct device *dev) { … } static int tegra_wdt_resume(struct device *dev) { … } static const struct of_device_id tegra_wdt_of_match[] = …; MODULE_DEVICE_TABLE(of, tegra_wdt_of_match); static DEFINE_SIMPLE_DEV_PM_OPS(tegra_wdt_pm_ops, tegra_wdt_suspend, tegra_wdt_resume); static struct platform_driver tegra_wdt_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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