/* 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 #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 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_ENTER, CLOCK_EVT_NOTIFY_BROADCAST_EXIT, CLOCK_EVT_NOTIFY_SUSPEND, CLOCK_EVT_NOTIFY_RESUME, 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 * @hints: usage hints * @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 * @set_mode: set mode function * @evthandler: 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; cpumask_t 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)(cpumask_t 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 struct clock_event_device *clockevents_request_device(unsigned int features, cpumask_t cpumask); extern void clockevents_release_device(struct clock_event_device *dev); 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 void clockevents_unregister_notifier(struct notifier_block *nb); extern int clockevents_program_event(struct clock_event_device *dev, ktime_t expires, ktime_t now); extern void clockevents_notify(unsigned long reason, void *arg); #else static inline void clockevents_resume_events(void) { } #define clockevents_notify(reason, arg) do { } while (0) #endif #endif