// SPDX-License-Identifier: GPL-2.0-only /* * VIA Chipset Watchdog Driver * * Copyright (C) 2011 Sigfox * Author: Marc Vertes <[email protected]> * Based on a preliminary version from Harald Welte <[email protected]> * Timer code by Wim Van Sebroeck <[email protected]> * * Caveat: PnP must be enabled in BIOS to allow full access to watchdog * control registers. If not, the watchdog must be configured in BIOS manually. */ #define pr_fmt(fmt) … #include <linux/device.h> #include <linux/io.h> #include <linux/jiffies.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/timer.h> #include <linux/watchdog.h> /* Configuration registers relative to the pci device */ #define VIA_WDT_MMIO_BASE … #define VIA_WDT_CONF … /* Relevant bits for the VIA_WDT_CONF register */ #define VIA_WDT_CONF_ENABLE … #define VIA_WDT_CONF_MMIO … /* * The MMIO region contains the watchdog control register and the * hardware timer counter. */ #define VIA_WDT_MMIO_LEN … #define VIA_WDT_CTL … #define VIA_WDT_COUNT … /* Bits for the VIA_WDT_CTL register */ #define VIA_WDT_RUNNING … #define VIA_WDT_FIRED … #define VIA_WDT_PWROFF … #define VIA_WDT_DISABLED … #define VIA_WDT_TRIGGER … /* Hardware heartbeat in seconds */ #define WDT_HW_HEARTBEAT … /* Timer heartbeat (500ms) */ #define WDT_HEARTBEAT … /* User space timeout in seconds */ #define WDT_TIMEOUT_MAX … #define WDT_TIMEOUT … static int timeout = …; module_param(timeout, int, 0); MODULE_PARM_DESC(…) …; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; static struct watchdog_device wdt_dev; static struct resource wdt_res; static void __iomem *wdt_mem; static unsigned int mmio; static void wdt_timer_tick(struct timer_list *unused); static DEFINE_TIMER(timer, wdt_timer_tick); /* The timer that pings the watchdog */ static unsigned long next_heartbeat; /* the next_heartbeat for the timer */ static inline void wdt_reset(void) { … } /* * Timer tick: the timer will make sure that the watchdog timer hardware * is being reset in time. The conditions to do this are: * 1) the watchdog timer has been started and /dev/watchdog is open * and there is still time left before userspace should send the * next heartbeat/ping. (note: the internal heartbeat is much smaller * then the external/userspace heartbeat). * 2) the watchdog timer has been stopped by userspace. */ static void wdt_timer_tick(struct timer_list *unused) { … } static int wdt_ping(struct watchdog_device *wdd) { … } static int wdt_start(struct watchdog_device *wdd) { … } static int wdt_stop(struct watchdog_device *wdd) { … } static int wdt_set_timeout(struct watchdog_device *wdd, unsigned int new_timeout) { … } static const struct watchdog_info wdt_info = …; static const struct watchdog_ops wdt_ops = …; static struct watchdog_device wdt_dev = …; static int wdt_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { … } static void wdt_remove(struct pci_dev *pdev) { … } static const struct pci_device_id wdt_pci_table[] = …; static struct pci_driver wdt_driver = …; module_pci_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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