include/linux/acpi_pmtmr.h

   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