1 /* 2 * arch/arm/include/asm/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 /* 14 * This is our kernel timer structure. 15 * 16 * - init 17 * Initialise the kernels jiffy timer source, claim interrupt 18 * using setup_irq. This is called early on during initialisation 19 * while interrupts are still disabled on the local CPU. 20 * - suspend 21 * Suspend the kernel jiffy timer source, if necessary. This 22 * is called with interrupts disabled, after all normal devices 23 * have been suspended. If no action is required, set this to 24 * NULL. 25 * - resume 26 * Resume the kernel jiffy timer source, if necessary. This 27 * is called with interrupts disabled before any normal devices 28 * are resumed. If no action is required, set this to NULL. 29 * - offset 30 * Return the timer offset in microseconds since the last timer 31 * interrupt. Note: this must take account of any unprocessed 32 * timer interrupt which may be pending. 33 */ 34 struct sys_timer { 35 void (*init)(void); 36 void (*suspend)(void); 37 void (*resume)(void); 38 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 39 unsigned long (*offset)(void); 40 #endif 41 }; 42 43 extern void timer_tick(void); 44 45 struct timespec; 46 typedef void (*clock_access_fn)(struct timespec *); 47 extern int register_persistent_clock(clock_access_fn read_boot, 48 clock_access_fn read_persistent); 49 50 #endif 51