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authorThomas Gleixner <tglx@linutronix.de>2007-02-16 04:27:57 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 11:13:58 -0500
commitd66bea57e779cd592657cca6e61345ae899b78d9 (patch)
tree70fe41bf930ac96a59d594ba5a37272a3df775e0 /include
parent169a0abbe32813af4904cc1605c0f7ea0534f77b (diff)
[PATCH] Allow early access to the power management timer
Allow early access to the power management timer by exposing the verified read function and providing a helper function which checks the pmtmr_ioport variable and returns either the pm timer readout or 0 in case the pm timer is not available. Create a new header file and replace also the ifdef'ed extern definition in arch/i386/kernel/acpi/boot.c This is a preperatory patch for the rework of the local apic timer calibration. No functional changes. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-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