// SPDX-License-Identifier: GPL-2.0-or-later /* * i6300esb: Watchdog timer driver for Intel 6300ESB chipset * * (c) Copyright 2004 Google Inc. * (c) Copyright 2005 David Härdeman <[email protected]> * * based on i810-tco.c which is in turn based on softdog.c * * The timer is implemented in the following I/O controller hubs: * (See the intel documentation on http://developer.intel.com.) * 6300ESB chip : document number 300641-004 * * 2004YYZZ Ross Biro * Initial version 0.01 * 2004YYZZ Ross Biro * Version 0.02 * 20050210 David Härdeman <[email protected]> * Ported driver to kernel 2.6 * 20171016 Radu Rendec <[email protected]> * Change driver to use the watchdog subsystem * Add support for multiple 6300ESB devices */ /* * Includes, defines, variables, module parameters, ... */ #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/mm.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/pci.h> #include <linux/ioport.h> #include <linux/uaccess.h> #include <linux/io.h> /* Module and version information */ #define ESB_MODULE_NAME … /* PCI configuration registers */ #define ESB_CONFIG_REG … #define ESB_LOCK_REG … /* Memory mapped registers */ #define ESB_TIMER1_REG(w) … #define ESB_TIMER2_REG(w) … #define ESB_GINTSR_REG(w) … #define ESB_RELOAD_REG(w) … /* Lock register bits */ #define ESB_WDT_FUNC … #define ESB_WDT_ENABLE … #define ESB_WDT_LOCK … /* Config register bits */ #define ESB_WDT_REBOOT … #define ESB_WDT_FREQ … #define ESB_WDT_INTTYPE … /* Reload register bits */ #define ESB_WDT_TIMEOUT … #define ESB_WDT_RELOAD … /* Magic constants */ #define ESB_UNLOCK1 … #define ESB_UNLOCK2 … /* module parameters */ /* 30 sec default heartbeat (1 < heartbeat < 2*1023) */ #define ESB_HEARTBEAT_MIN … #define ESB_HEARTBEAT_MAX … #define ESB_HEARTBEAT_DEFAULT … #define ESB_HEARTBEAT_RANGE … static int heartbeat; /* in seconds */ module_param(heartbeat, int, 0); MODULE_PARM_DESC(…) …; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; /* internal variables */ struct esb_dev { … }; #define to_esb_dev(wptr) … /* * Some i6300ESB specific functions */ /* * Prepare for reloading the timer by unlocking the proper registers. * This is performed by first writing 0x80 followed by 0x86 to the * reload register. After this the appropriate registers can be written * to once before they need to be unlocked again. */ static inline void esb_unlock_registers(struct esb_dev *edev) { … } static int esb_timer_start(struct watchdog_device *wdd) { … } static int esb_timer_stop(struct watchdog_device *wdd) { … } static int esb_timer_keepalive(struct watchdog_device *wdd) { … } static int esb_timer_set_heartbeat(struct watchdog_device *wdd, unsigned int time) { … } /* * Watchdog Subsystem Interfaces */ static struct watchdog_info esb_info = …; static const struct watchdog_ops esb_ops = …; /* * Data for PCI driver interface */ static const struct pci_device_id esb_pci_tbl[] = …; MODULE_DEVICE_TABLE(pci, esb_pci_tbl); /* * Init & exit routines */ static unsigned char esb_getdevice(struct esb_dev *edev) { … } static void esb_initdevice(struct esb_dev *edev) { … } static int esb_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { … } static void esb_remove(struct pci_dev *pdev) { … } static struct pci_driver esb_driver = …; module_pci_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux