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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 
 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 #else
 29 
 30 static inline u32 acpi_pm_read_early(void)
 31 {
 32         return 0;
 33 }
 34 
 35 #endif
 36 
 37 #endif
 38 
 39 

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