diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/clockchips.h | 142 | ||||
| -rw-r--r-- | include/linux/hrtimer.h | 5 |
2 files changed, 144 insertions, 3 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h new file mode 100644 index 000000000000..4ea7e7bcfafe --- /dev/null +++ b/include/linux/clockchips.h @@ -0,0 +1,142 @@ +/* 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 diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index 9041405d0b71..a759636fd09f 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -144,6 +144,8 @@ struct hrtimer_cpu_base { * is expired in the next softirq when the clock was advanced. */ #define clock_was_set() do { } while (0) +extern ktime_t ktime_get(void); +extern ktime_t ktime_get_real(void); /* Exported timer functions: */ @@ -196,9 +198,6 @@ extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, /* Soft interrupt function to run the hrtimer queues: */ extern void hrtimer_run_queues(void); -/* Resume notification */ -void hrtimer_notify_resume(void); - /* Bootup initialization: */ extern void __init hrtimers_init(void); |