acpi_pmtmr.h

Go to the documentation of this file.

#ifndef _ACPI_PMTMR_H_
#define _ACPI_PMTMR_H_

#include <linux/clocksource.h>

/* Number of PMTMR ticks expected during calibration run */
#define PMTMR_TICKS_PER_SEC 3579545

/* limit it to 24 bits */
#define ACPI_PM_MASK CLOCKSOURCE_MASK(24)

/* Overrun value */
#define ACPI_PM_OVRRUN  (1<<24)

#ifdef CONFIG_X86_PM_TIMER

extern u32 acpi_pm_read_verified(void);
extern u32 pmtmr_ioport;

static inline u32 acpi_pm_read_early(void)
{
    if (!pmtmr_ioport)
        return 0;
    /* mask the output to 24 bits */
    return acpi_pm_read_verified() & ACPI_PM_MASK;
}

#else

static inline u32 acpi_pm_read_early(void)
{
    return 0;
}

#endif

#endif