2 * linux/include/asm-arm/mach/time.h
4 * Copyright (C) 2004 MontaVista Software, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #ifndef __ASM_ARM_MACH_TIME_H
11 #define __ASM_ARM_MACH_TIME_H
13 #include <linux/sysdev.h>
16 * This is our kernel timer structure.
19 * Initialise the kernels jiffy timer source, claim interrupt
20 * using setup_irq. This is called early on during initialisation
21 * while interrupts are still disabled on the local CPU.
23 * Suspend the kernel jiffy timer source, if necessary. This
24 * is called with interrupts disabled, after all normal devices
25 * have been suspended. If no action is required, set this to
28 * Resume the kernel jiffy timer source, if necessary. This
29 * is called with interrupts disabled before any normal devices
30 * are resumed. If no action is required, set this to NULL.
32 * Return the timer offset in microseconds since the last timer
33 * interrupt. Note: this must take account of any unprocessed
34 * timer interrupt which may be pending.
37 struct sys_device dev;
39 void (*suspend)(void);
41 #ifndef CONFIG_GENERIC_TIME
42 unsigned long (*offset)(void);
45 #ifdef CONFIG_NO_IDLE_HZ
46 struct dyn_tick_timer *dyn_tick;
50 #ifdef CONFIG_NO_IDLE_HZ
52 #define DYN_TICK_ENABLED (1 << 1)
54 struct dyn_tick_timer {
56 unsigned int state; /* Current state */
57 int (*enable)(void); /* Enables dynamic tick */
58 int (*disable)(void); /* Disables dynamic tick */
59 void (*reprogram)(unsigned long); /* Reprograms the timer */
60 int (*handler)(int, void *);
63 void timer_dyn_reprogram(void);
65 #define timer_dyn_reprogram() do { } while (0)
68 extern struct sys_timer *system_timer;
69 extern void timer_tick(void);
72 * Kernel time keeping support.
75 extern int (*set_rtc)(void);
76 extern void save_time_delta(struct timespec *delta, struct timespec *rtc);
77 extern void restore_time_delta(struct timespec *delta, struct timespec *rtc);