x86: Geode MFGPT clock event device support

Add support for an MFGPT clock event device; this allows us to use MFGPTs as
the basis for high-resolution timers.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 2d85e4b87307..6bbbc2755e44 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -1206,6 +1206,16 @@ config SCx200HR_TIMER
           processor goes idle (as is done by the scheduler).  The
           other workaround is idle=poll boot option.
 
+config GEODE_MFGPT_TIMER
+        bool "Geode Multi-Function General Purpose Timer (MFGPT) events"
+        depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
+        default y
+        help
+          This driver provides a clock event source based on the MFGPT
+          timer(s) in the CS5535 and CS5536 companion chip for the geode.
+          MFGPTs have a better resolution and max interval than the
+          generic PIT, and are suitable for use as high-res timers.
+
 config K8_NB
         def_bool y
         depends on AGP_AMD64