/*  linux/include/linux/clockchips.h * *  This file contains the structure definitions for clockchips. * *  If you are not a clockchip, or the time of day code, you should *  not be including this file! */#ifndef _LINUX_CLOCKCHIPS_H#define _LINUX_CLOCKCHIPS_H #ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD #include <linux/clocksource.h>#include <linux/cpumask.h>#include <linux/ktime.h>#include <linux/notifier.h> struct clock_event_device; /* Clock event mode commands */enum clock_event_mode {	CLOCK_EVT_MODE_UNUSED = 0,	CLOCK_EVT_MODE_SHUTDOWN,	CLOCK_EVT_MODE_PERIODIC,	CLOCK_EVT_MODE_ONESHOT,	CLOCK_EVT_MODE_RESUME,}; /* Clock event notification values */enum clock_event_nofitiers {	CLOCK_EVT_NOTIFY_ADD,	CLOCK_EVT_NOTIFY_BROADCAST_ON,	CLOCK_EVT_NOTIFY_BROADCAST_OFF,	CLOCK_EVT_NOTIFY_BROADCAST_FORCE,	CLOCK_EVT_NOTIFY_BROADCAST_ENTER,	CLOCK_EVT_NOTIFY_BROADCAST_EXIT,	CLOCK_EVT_NOTIFY_SUSPEND,	CLOCK_EVT_NOTIFY_RESUME,	CLOCK_EVT_NOTIFY_CPU_DYING,	CLOCK_EVT_NOTIFY_CPU_DEAD,}; /* * Clock event features */#define CLOCK_EVT_FEAT_PERIODIC		0x000001#define CLOCK_EVT_FEAT_ONESHOT		0x000002/* * x86(64) specific misfeatures: * * - Clockevent source stops in C3 State and needs broadcast support. * - Local APIC timer is used as a dummy device. */#define CLOCK_EVT_FEAT_C3STOP		0x000004#define CLOCK_EVT_FEAT_DUMMY		0x000008 /** * struct clock_event_device - clock event device descriptor * @name:		ptr to clock event name * @features:		features * @max_delta_ns:	maximum delta value in ns * @min_delta_ns:	minimum delta value in ns * @mult:		nanosecond to cycles multiplier * @shift:		nanoseconds to cycles divisor (power of two) * @rating:		variable to rate clock event devices * @irq:		IRQ number (only for non CPU local devices) * @cpumask:		cpumask to indicate for which CPUs this device works * @set_next_event:	set next event function * @set_mode:		set mode function * @event_handler:	Assigned by the framework to be called by the low *			level handler of the event source * @broadcast:		function to broadcast events * @list:		list head for the management code * @mode:		operating mode assigned by the management code * @next_event:		local storage for the next event in oneshot mode */struct clock_event_device {	const char		*name;	unsigned int		features;	unsigned long		max_delta_ns;	unsigned long		min_delta_ns;	unsigned long		mult;	int			shift;	int			rating;	int			irq;	const struct cpumask	*cpumask;	int			(*set_next_event)(unsigned long evt,						  struct clock_event_device *);	void			(*set_mode)(enum clock_event_mode mode,					    struct clock_event_device *);	void			(*event_handler)(struct clock_event_device *);	void			(*broadcast)(const struct cpumask *mask);	struct list_head	list;	enum clock_event_mode	mode;	ktime_t			next_event;}; /* * Calculate a multiplication factor for scaled math, which is used to convert * nanoseconds based values to clock ticks: * * clock_ticks = (nanoseconds * factor) >> shift. * * div_sc is the rearranged equation to calculate a factor from a given clock * ticks / nanoseconds ratio: * * factor = (clock_ticks << shift) / nanoseconds */static inline unsigned long div_sc(unsigned long ticks, unsigned long nsec,				   int shift){	uint64_t tmp = ((uint64_t)ticks) << shift; 	do_div(tmp, nsec);	return (unsigned long) tmp;} /* Clock event layer functions */extern unsigned long clockevent_delta2ns(unsigned long latch,					 struct clock_event_device *evt);extern void clockevents_register_device(struct clock_event_device *dev); extern void clockevents_exchange_device(struct clock_event_device *old,					struct clock_event_device *new);extern void clockevents_set_mode(struct clock_event_device *dev,				 enum clock_event_mode mode);extern int clockevents_register_notifier(struct notifier_block *nb);extern int clockevents_program_event(struct clock_event_device *dev,				     ktime_t expires, ktime_t now); extern void clockevents_handle_noop(struct clock_event_device *dev); #ifdef CONFIG_GENERIC_CLOCKEVENTSextern void clockevents_notify(unsigned long reason, void *arg);#else# define clockevents_notify(reason, arg) do { } while (0)#endif #else /* CONFIG_GENERIC_CLOCKEVENTS_BUILD */ #define clockevents_notify(reason, arg) do { } while (0) #endif #endif