arch/arm/include/asm/mach/time.h

   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