litmus-rt.git - The LITMUS^RT kernel.

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author	Linus Torvalds <torvalds@woody.linux-foundation.org>	2007-02-20 23:32:30 -0500
committer	Linus Torvalds <torvalds@woody.linux-foundation.org>	2007-02-20 23:32:30 -0500
commit	c8f71b01a50597e298dc3214a2f2be7b8d31170c (patch)
tree	4925da5e2cac397a61a14aacc9be496bd20db174 /arch/powerpc/sysdev/tsi108_pci.c
parent	f1d2120487de3620ff47367d7bc0e290dc868c47 (diff)

Linux 2.6.21-rc1v2.6.21-rc1

Diffstat (limited to 'arch/powerpc/sysdev/tsi108_pci.c')

0 files changed, 0 insertions, 0 deletions

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


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