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Commit 4e7f9df2 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Ingo Molnar
Browse files

hpet: Drop stale URLs 



Looks like the HPET spec at intel.com got moved.
It isn't hard to find so drop the link, just mention
the revision assumed.

Suggested-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-doc@vger.kernel.org
Link: http://lkml.kernel.org/r/1455145462-3877-1-git-send-email-mst@redhat.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent a82eee74

Documentation/timers/hpet.txt

+1 −3
Original line number Original line Diff line number Diff line 
		High Precision Event Timer Driver for Linux

		High Precision Event Timer Driver for Linux





The High Precision Event Timer (HPET) hardware follows a specification

The High Precision Event Timer (HPET) hardware follows a specification

by Intel and Microsoft which can be found at

by Intel and Microsoft, revision 1.



	http://www.intel.com/hardwaredesign/hpetspec_1.pdf





Each HPET has one fixed-rate counter (at 10+ MHz, hence "High Precision")

Each HPET has one fixed-rate counter (at 10+ MHz, hence "High Precision")

and up to 32 comparators.  Normally three or more comparators are provided,

and up to 32 comparators.  Normally three or more comparators are provided,

arch/x86/Kconfig

+2 −2
Original line number Original line Diff line number Diff line
@@ -778,8 +778,8 @@ config HPET_TIMER 
	  HPET is the next generation timer replacing legacy 8254s.

	  HPET is the next generation timer replacing legacy 8254s.

	  The HPET provides a stable time base on SMP

	  The HPET provides a stable time base on SMP

	  systems, unlike the TSC, but it is more expensive to access,

	  systems, unlike the TSC, but it is more expensive to access,

	  as it is off-chip.  You can find the HPET spec at

	  as it is off-chip.  The interface used is documented

	  <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.

	  in the HPET spec, revision 1.





	  You can safely choose Y here.  However, HPET will only be

	  You can safely choose Y here.  However, HPET will only be

	  activated if the platform and the BIOS support this feature.

	  activated if the platform and the BIOS support this feature.

drivers/char/hpet.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -42,7 +42,7 @@ 
/*

/*

 * The High Precision Event Timer driver.

 * The High Precision Event Timer driver.

 * This driver is closely modelled after the rtc.c driver.

 * This driver is closely modelled after the rtc.c driver.

 * http://www.intel.com/hardwaredesign/hpetspec_1.pdf

 * See HPET spec revision 1.

 */

 */

#define	HPET_USER_FREQ	(64)

#define	HPET_USER_FREQ	(64)

#define	HPET_DRIFT	(500)

#define	HPET_DRIFT	(500)