1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ACPI_PMTMR_H_ 3 #define _ACPI_PMTMR_H_ 4 5 #include <linux/clocksource.h> 6 7 /* Number of PMTMR ticks expected during calibration run */ 8 #define PMTMR_TICKS_PER_SEC 3579545 9 10 /* limit it to 24 bits */ 11 #define ACPI_PM_MASK CLOCKSOURCE_MASK(24) 12 13 /* Overrun value */ 14 #define ACPI_PM_OVRRUN (1<<24) 15 16 #ifdef CONFIG_X86_PM_TIMER 17 18 extern u32 acpi_pm_read_verified(void); 19 extern u32 pmtmr_ioport; 20 21 static inline u32 acpi_pm_read_early(void) 22 { 23 if (!pmtmr_ioport) 24 return 0; 25 /* mask the output to 24 bits */ 26 return acpi_pm_read_verified() & ACPI_PM_MASK; 27 } 28 29 #else 30 31 static inline u32 acpi_pm_read_early(void) 32 { 33 return 0; 34 } 35 36 #endif 37 38 #endif 39 40