linux/include/linux/acpi_pmtmr.h
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   1#ifndef _ACPI_PMTMR_H_
   2#define _ACPI_PMTMR_H_
   3
   4#include <linux/clocksource.h>
   5
   6/* Number of PMTMR ticks expected during calibration run */
   7#define PMTMR_TICKS_PER_SEC 3579545
   8
   9/* limit it to 24 bits */
  10#define ACPI_PM_MASK CLOCKSOURCE_MASK(24)
  11
  12/* Overrun value */
  13#define ACPI_PM_OVRRUN  (1<<24)
  14
  15#ifdef CONFIG_X86_PM_TIMER
  16
  17extern u32 acpi_pm_read_verified(void);
  18extern u32 pmtmr_ioport;
  19
  20static inline u32 acpi_pm_read_early(void)
  21{
  22        if (!pmtmr_ioport)
  23                return 0;
  24        /* mask the output to 24 bits */
  25        return acpi_pm_read_verified() & ACPI_PM_MASK;
  26}
  27
  28#else
  29
  30static inline u32 acpi_pm_read_early(void)
  31{
  32        return 0;
  33}
  34
  35#endif
  36
  37#endif
  38
  39
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