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Thomas Gleixnerf8381cb2007-02-16 01:28:02 -08001/*
2 * tick internal variable and functions used by low/high res code
3 */
Torben Hohne2830b52011-01-27 16:00:32 +01004#include <linux/hrtimer.h>
5#include <linux/tick.h>
Thomas Gleixner64414022008-09-22 18:46:37 +02006
Thomas Gleixner7cf37e82011-02-01 09:34:58 +01007#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
Thomas Gleixner64414022008-09-22 18:46:37 +02008
9#define TICK_DO_TIMER_NONE -1
10#define TICK_DO_TIMER_BOOT -2
11
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080012DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080013extern ktime_t tick_next_period;
14extern ktime_t tick_period;
Thomas Gleixnerd3ed7822007-05-08 00:30:03 -070015extern int tick_do_timer_cpu __read_mostly;
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080016
17extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
18extern void tick_handle_periodic(struct clock_event_device *dev);
19
Thomas Gleixner2344abb2008-09-16 11:32:50 -070020extern void clockevents_shutdown(struct clock_event_device *dev);
21
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080022/*
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080023 * NO_HZ / high resolution timer shared code
24 */
25#ifdef CONFIG_TICK_ONESHOT
26extern void tick_setup_oneshot(struct clock_event_device *newdev,
27 void (*handler)(struct clock_event_device *),
28 ktime_t nextevt);
29extern int tick_program_event(ktime_t expires, int force);
30extern void tick_oneshot_notify(void);
31extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
Thomas Gleixnercd05a1f2007-03-17 00:25:52 +010032extern void tick_resume_oneshot(void);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080033# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
34extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
35extern void tick_broadcast_oneshot_control(unsigned long reason);
36extern void tick_broadcast_switch_to_oneshot(void);
37extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
Thomas Gleixnercd05a1f2007-03-17 00:25:52 +010038extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
Thomas Gleixner27ce4cb4a2008-09-22 19:04:02 +020039extern int tick_broadcast_oneshot_active(void);
Thomas Gleixnerfb02fbc2008-10-17 10:01:23 +020040extern void tick_check_oneshot_broadcast(int cpu);
Thomas Gleixner3a142a02011-02-25 22:34:23 +010041bool tick_broadcast_oneshot_available(void);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080042# else /* BROADCAST */
43static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
44{
45 BUG();
46}
47static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
48static inline void tick_broadcast_switch_to_oneshot(void) { }
49static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
Thomas Gleixner27ce4cb4a2008-09-22 19:04:02 +020050static inline int tick_broadcast_oneshot_active(void) { return 0; }
Thomas Gleixnerfb02fbc2008-10-17 10:01:23 +020051static inline void tick_check_oneshot_broadcast(int cpu) { }
Thomas Gleixner3a142a02011-02-25 22:34:23 +010052static inline bool tick_broadcast_oneshot_available(void) { return true; }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080053# endif /* !BROADCAST */
54
55#else /* !ONESHOT */
56static inline
57void tick_setup_oneshot(struct clock_event_device *newdev,
58 void (*handler)(struct clock_event_device *),
59 ktime_t nextevt)
60{
61 BUG();
62}
Thomas Gleixnercd05a1f2007-03-17 00:25:52 +010063static inline void tick_resume_oneshot(void)
64{
65 BUG();
66}
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080067static inline int tick_program_event(ktime_t expires, int force)
68{
69 return 0;
70}
71static inline void tick_oneshot_notify(void) { }
72static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
73{
74 BUG();
75}
76static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
77static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
Thomas Gleixnercd05a1f2007-03-17 00:25:52 +010078static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
79{
80 return 0;
81}
Ingo Molnarf8e256c2008-09-23 13:00:57 +020082static inline int tick_broadcast_oneshot_active(void) { return 0; }
Thomas Gleixner3a142a02011-02-25 22:34:23 +010083static inline bool tick_broadcast_oneshot_available(void) { return false; }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080084#endif /* !TICK_ONESHOT */
85
86/*
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080087 * Broadcasting support
88 */
89#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080090extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
91extern int tick_check_broadcast_device(struct clock_event_device *dev);
92extern int tick_is_broadcast_device(struct clock_event_device *dev);
93extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
94extern void tick_shutdown_broadcast(unsigned int *cpup);
Thomas Gleixner6321dd62007-03-06 08:25:42 +010095extern void tick_suspend_broadcast(void);
96extern int tick_resume_broadcast(void);
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080097
98extern void
99tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
100
101#else /* !BROADCAST */
102
103static inline int tick_check_broadcast_device(struct clock_event_device *dev)
104{
105 return 0;
106}
107
108static inline int tick_is_broadcast_device(struct clock_event_device *dev)
109{
110 return 0;
111}
112static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
113 int cpu)
114{
115 return 0;
116}
117static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
118static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
119static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
Thomas Gleixner6321dd62007-03-06 08:25:42 +0100120static inline void tick_suspend_broadcast(void) { }
121static inline int tick_resume_broadcast(void) { return 0; }
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -0800122
123/*
124 * Set the periodic handler in non broadcast mode
125 */
126static inline void tick_set_periodic_handler(struct clock_event_device *dev,
127 int broadcast)
128{
129 dev->event_handler = tick_handle_periodic;
130}
131#endif /* !BROADCAST */
132
133/*
134 * Check, if the device is functional or a dummy for broadcast
135 */
136static inline int tick_device_is_functional(struct clock_event_device *dev)
137{
138 return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
139}
Torben Hohne2830b52011-01-27 16:00:32 +0100140
Thomas Gleixner7cf37e82011-02-01 09:34:58 +0100141#endif
142
Torben Hohne2830b52011-01-27 16:00:32 +0100143extern void do_timer(unsigned long ticks);