162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci#ifndef _ACPI_PMTMR_H_ 362306a36Sopenharmony_ci#define _ACPI_PMTMR_H_ 462306a36Sopenharmony_ci 562306a36Sopenharmony_ci#include <linux/clocksource.h> 662306a36Sopenharmony_ci 762306a36Sopenharmony_ci/* Number of PMTMR ticks expected during calibration run */ 862306a36Sopenharmony_ci#define PMTMR_TICKS_PER_SEC 3579545 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci/* limit it to 24 bits */ 1162306a36Sopenharmony_ci#define ACPI_PM_MASK CLOCKSOURCE_MASK(24) 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci/* Overrun value */ 1462306a36Sopenharmony_ci#define ACPI_PM_OVRRUN (1<<24) 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_ci#ifdef CONFIG_X86_PM_TIMER 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ciextern u32 acpi_pm_read_verified(void); 1962306a36Sopenharmony_ciextern u32 pmtmr_ioport; 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_cistatic inline u32 acpi_pm_read_early(void) 2262306a36Sopenharmony_ci{ 2362306a36Sopenharmony_ci if (!pmtmr_ioport) 2462306a36Sopenharmony_ci return 0; 2562306a36Sopenharmony_ci /* mask the output to 24 bits */ 2662306a36Sopenharmony_ci return acpi_pm_read_verified() & ACPI_PM_MASK; 2762306a36Sopenharmony_ci} 2862306a36Sopenharmony_ci 2962306a36Sopenharmony_ci#else 3062306a36Sopenharmony_ci 3162306a36Sopenharmony_cistatic inline u32 acpi_pm_read_early(void) 3262306a36Sopenharmony_ci{ 3362306a36Sopenharmony_ci return 0; 3462306a36Sopenharmony_ci} 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci#endif 3762306a36Sopenharmony_ci 3862306a36Sopenharmony_ci#endif 3962306a36Sopenharmony_ci 40