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3048253ed9
Add support for watchdog drivers to initialize/set the timeout field of the watchdog_device structure. The timeout field is initialised either with the module timeout parameter value (if valid) or with the timeout-sec dt property (if valid). If both are invalid the initial value is unchanged. Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
146 lines
5.0 KiB
C
146 lines
5.0 KiB
C
/*
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* Generic watchdog defines. Derived from..
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*
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* Berkshire PC Watchdog Defines
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* by Ken Hollis <khollis@bitgate.com>
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*
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*/
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#ifndef _LINUX_WATCHDOG_H
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#define _LINUX_WATCHDOG_H
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include <uapi/linux/watchdog.h>
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struct watchdog_ops;
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struct watchdog_device;
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/** struct watchdog_ops - The watchdog-devices operations
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*
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* @owner: The module owner.
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* @start: The routine for starting the watchdog device.
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* @stop: The routine for stopping the watchdog device.
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* @ping: The routine that sends a keepalive ping to the watchdog device.
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* @status: The routine that shows the status of the watchdog device.
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* @set_timeout:The routine for setting the watchdog devices timeout value.
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* @get_timeleft:The routine that get's the time that's left before a reset.
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* @ref: The ref operation for dyn. allocated watchdog_device structs
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* @unref: The unref operation for dyn. allocated watchdog_device structs
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* @ioctl: The routines that handles extra ioctl calls.
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*
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* The watchdog_ops structure contains a list of low-level operations
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* that control a watchdog device. It also contains the module that owns
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* these operations. The start and stop function are mandatory, all other
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* functions are optonal.
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*/
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struct watchdog_ops {
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struct module *owner;
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/* mandatory operations */
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int (*start)(struct watchdog_device *);
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int (*stop)(struct watchdog_device *);
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/* optional operations */
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int (*ping)(struct watchdog_device *);
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unsigned int (*status)(struct watchdog_device *);
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int (*set_timeout)(struct watchdog_device *, unsigned int);
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unsigned int (*get_timeleft)(struct watchdog_device *);
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void (*ref)(struct watchdog_device *);
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void (*unref)(struct watchdog_device *);
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long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
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};
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/** struct watchdog_device - The structure that defines a watchdog device
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*
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* @id: The watchdog's ID. (Allocated by watchdog_register_device)
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* @cdev: The watchdog's Character device.
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* @dev: The device for our watchdog
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* @parent: The parent bus device
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* @info: Pointer to a watchdog_info structure.
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* @ops: Pointer to the list of watchdog operations.
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* @bootstatus: Status of the watchdog device at boot.
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* @timeout: The watchdog devices timeout value.
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* @min_timeout:The watchdog devices minimum timeout value.
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* @max_timeout:The watchdog devices maximum timeout value.
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* @driver-data:Pointer to the drivers private data.
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* @lock: Lock for watchdog core internal use only.
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* @status: Field that contains the devices internal status bits.
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*
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* The watchdog_device structure contains all information about a
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* watchdog timer device.
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*
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* The driver-data field may not be accessed directly. It must be accessed
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* via the watchdog_set_drvdata and watchdog_get_drvdata helpers.
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*
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* The lock field is for watchdog core internal use only and should not be
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* touched.
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*/
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struct watchdog_device {
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int id;
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struct cdev cdev;
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struct device *dev;
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struct device *parent;
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const struct watchdog_info *info;
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const struct watchdog_ops *ops;
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unsigned int bootstatus;
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unsigned int timeout;
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unsigned int min_timeout;
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unsigned int max_timeout;
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void *driver_data;
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struct mutex lock;
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unsigned long status;
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/* Bit numbers for status flags */
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#define WDOG_ACTIVE 0 /* Is the watchdog running/active */
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#define WDOG_DEV_OPEN 1 /* Opened via /dev/watchdog ? */
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#define WDOG_ALLOW_RELEASE 2 /* Did we receive the magic char ? */
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#define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */
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#define WDOG_UNREGISTERED 4 /* Has the device been unregistered */
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};
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#ifdef CONFIG_WATCHDOG_NOWAYOUT
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#define WATCHDOG_NOWAYOUT 1
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#define WATCHDOG_NOWAYOUT_INIT_STATUS (1 << WDOG_NO_WAY_OUT)
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#else
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#define WATCHDOG_NOWAYOUT 0
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#define WATCHDOG_NOWAYOUT_INIT_STATUS 0
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#endif
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/* Use the following function to check whether or not the watchdog is active */
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static inline bool watchdog_active(struct watchdog_device *wdd)
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{
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return test_bit(WDOG_ACTIVE, &wdd->status);
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}
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/* Use the following function to set the nowayout feature */
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static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout)
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{
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if (nowayout)
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set_bit(WDOG_NO_WAY_OUT, &wdd->status);
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}
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/* Use the following function to check if a timeout value is invalid */
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static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigned int t)
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{
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return ((wdd->max_timeout != 0) &&
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(t < wdd->min_timeout || t > wdd->max_timeout));
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}
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/* Use the following functions to manipulate watchdog driver specific data */
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static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data)
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{
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wdd->driver_data = data;
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}
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static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
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{
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return wdd->driver_data;
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}
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/* drivers/watchdog/watchdog_core.c */
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extern int watchdog_init_timeout(struct watchdog_device *wdd,
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unsigned int timeout_parm, struct device *dev);
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extern int watchdog_register_device(struct watchdog_device *);
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extern void watchdog_unregister_device(struct watchdog_device *);
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#endif /* ifndef _LINUX_WATCHDOG_H */
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