include/asm-i386/timer.h

   1 #ifndef _ASMi386_TIMER_H
   2 #define _ASMi386_TIMER_H
   3 #include <linux/init.h>
   4 #include <linux/pm.h>
   5
   6 /**
   7  * struct timer_ops - used to define a timer source
   8  *
   9  * @name: name of the timer.
  10  * @init: Probes and initializes the timer. Takes clock= override
  11  *        string as an argument. Returns 0 on success, anything else
  12  *        on failure.
  13  * @mark_offset: called by the timer interrupt.
  14  * @get_offset:  called by gettimeofday(). Returns the number of microseconds
  15  *               since the last timer interupt.
  16  * @monotonic_clock: returns the number of nanoseconds since the init of the
  17  *                   timer.
  18  * @delay: delays this many clock cycles.
  19  */
  20 struct timer_opts {
  21         char* name;
  22         void (*mark_offset)(void);
  23         unsigned long (*get_offset)(void);
  24         unsigned long long (*monotonic_clock)(void);
  25         void (*delay)(unsigned long);
  26         unsigned long (*read_timer)(void);
  27         int (*suspend)(pm_message_t state);
  28         int (*resume)(void);
  29 };
  30
  31 struct init_timer_opts {
  32         int (*init)(char *override);
  33         struct timer_opts *opts;
  34 };
  35
  36 #define TICK_SIZE (tick_nsec / 1000)
  37
  38 extern struct timer_opts* __init select_timer(void);
  39 extern void clock_fallback(void);
  40 void setup_pit_timer(void);
  41
  42 /* Modifiers for buggy PIT handling */
  43
  44 extern int pit_latch_buggy;
  45
  46 extern struct timer_opts *cur_timer;
  47 extern int timer_ack;
  48
  49 /* list of externed timers */
  50 extern struct timer_opts timer_none;
  51 extern struct timer_opts timer_pit;
  52 extern struct init_timer_opts timer_pit_init;
  53 extern struct init_timer_opts timer_tsc_init;
  54 #ifdef CONFIG_X86_CYCLONE_TIMER
  55 extern struct init_timer_opts timer_cyclone_init;
  56 #endif
  57
  58 extern unsigned long calibrate_tsc(void);
  59 extern unsigned long read_timer_tsc(void);
  60 extern void init_cpu_khz(void);
  61 extern int recalibrate_cpu_khz(void);
  62 #ifdef CONFIG_HPET_TIMER
  63 extern struct init_timer_opts timer_hpet_init;
  64 extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
  65 #endif
  66
  67 #ifdef CONFIG_X86_PM_TIMER
  68 extern struct init_timer_opts timer_pmtmr_init;
  69 #endif
  70 #endif