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 

    17 extern u32 acpi_pm_read_verified(void);

    18 extern u32 pmtmr_ioport;

    19 

    20 static 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 extern void pmtimer_wait(unsigned);

    29 

    30 #else

    31 

    32 static inline u32 acpi_pm_read_early(void)

    33 {

    34 	return 0;

    35 }

    36 

    37 #endif

    38 

    39 #endif

    40