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-rw-r--r--include/linux/acpi_pmtmr.h38
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
17extern u32 acpi_pm_read_verified(void);
18extern u32 pmtmr_ioport;
19
20static 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
30static inline u32 acpi_pm_read_early(void)
31{
32 return 0;
33}
34
35#endif
36
37#endif
38