Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
os
linux
1/*
2 * linux/include/asm-arm/mach/time.h
3 *
4 * Copyright (C) 2004 MontaVista Software, Inc.
5 *
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.
9 */
10#ifndef __ASM_ARM_MACH_TIME_H
11#define __ASM_ARM_MACH_TIME_H
12
13#include <linux/sysdev.h>
14
15/*
16 * This is our kernel timer structure.
17 *
18 * - init
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.
22 * - suspend
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
26 * NULL.
27 * - resume
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.
31 * - offset
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.
35 */
36struct sys_timer {
37 struct sys_device dev;
38 void (*init)(void);
39 void (*suspend)(void);
40 void (*resume)(void);
41#ifndef CONFIG_GENERIC_TIME
42 unsigned long (*offset)(void);
43#endif
44
45#ifdef CONFIG_NO_IDLE_HZ
46 struct dyn_tick_timer *dyn_tick;
47#endif
48};
49
50#ifdef CONFIG_NO_IDLE_HZ
51
52#define DYN_TICK_ENABLED (1 << 1)
53
54struct dyn_tick_timer {
55 spinlock_t lock;
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 *);
61};
62
63void timer_dyn_reprogram(void);
64#else
65#define timer_dyn_reprogram() do { } while (0)
66#endif
67
68extern struct sys_timer *system_timer;
69extern void timer_tick(void);
70
71/*
72 * Kernel time keeping support.
73 */
74struct timespec;
75extern int (*set_rtc)(void);
76extern void save_time_delta(struct timespec *delta, struct timespec *rtc);
77extern void restore_time_delta(struct timespec *delta, struct timespec *rtc);
78
79#endif