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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 | */ | |
36 | struct sys_timer { | |
37 | struct sys_device dev; | |
38 | void (*init)(void); | |
39 | void (*suspend)(void); | |
40 | void (*resume)(void); | |
41 | unsigned long (*offset)(void); | |
8749af68 RK |
42 | |
43 | #ifdef CONFIG_NO_IDLE_HZ | |
44 | struct dyn_tick_timer *dyn_tick; | |
45 | #endif | |
46 | }; | |
47 | ||
48 | #ifdef CONFIG_NO_IDLE_HZ | |
49 | ||
8749af68 | 50 | #define DYN_TICK_ENABLED (1 << 1) |
8749af68 RK |
51 | |
52 | struct dyn_tick_timer { | |
53 | unsigned int state; /* Current state */ | |
54 | int (*enable)(void); /* Enables dynamic tick */ | |
55 | int (*disable)(void); /* Disables dynamic tick */ | |
56 | void (*reprogram)(unsigned long); /* Reprograms the timer */ | |
57 | int (*handler)(int, void *, struct pt_regs *); | |
1da177e4 LT |
58 | }; |
59 | ||
8749af68 | 60 | void timer_dyn_reprogram(void); |
2ea83398 RK |
61 | #else |
62 | #define timer_dyn_reprogram() do { } while (0) | |
8749af68 RK |
63 | #endif |
64 | ||
1da177e4 LT |
65 | extern struct sys_timer *system_timer; |
66 | extern void timer_tick(struct pt_regs *); | |
67 | ||
68 | /* | |
69 | * Kernel time keeping support. | |
70 | */ | |
71 | extern int (*set_rtc)(void); | |
72 | extern void save_time_delta(struct timespec *delta, struct timespec *rtc); | |
73 | extern void restore_time_delta(struct timespec *delta, struct timespec *rtc); | |
74 | ||
75 | #endif |