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 | |