diff options
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/acpi_pmtmr.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/include/linux/acpi_pmtmr.h b/include/linux/acpi_pmtmr.h new file mode 100644 index 000000000000..1d0ef1ae8036 --- /dev/null +++ b/include/linux/acpi_pmtmr.h | |||
@@ -0,0 +1,38 @@ | |||
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 | |||