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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