[SPARC64]: Add clocksource/clockevents support.

I'd like to thank John Stul and others for helping
me along the way.

A lot of cleanups fell out of this.  For example, the get_compare()
tick_op was totally unused, so was deleted.  And the most often used
tick_op members were grouped together for cache-friendlyness.

The sparc64 TSC is given to the kernel as a one-shot timer.

tick_ops->init_timer() simply turns off the privileged bit in
the tick register (when possible), and disables the interrupt
by setting bit 63 in the compare register.  The ->disable_irq()
op also sets this bit.

tick_ops->add_compare() is changed to:

1) Add the given delta to "tick" not to "compare"
2) Return a boolean which, if true, means that the tick
   value read after writing the compare value was found
   to have incremented past the initial tick value.  This
   mirrors logic used in the HPET driver's ->next_event()
   method.

Each tick_ops implementation also now provides a name string.
And we feed this into the clocksource and clockevents layers.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 4 deletions

diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index 1a6348b565fb..51c87fdd998c 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -19,6 +19,14 @@ config SPARC64
           SPARC64 ports; its web page is available at
           <http://www.ultralinux.org/>.
 
+config GENERIC_TIME
+        bool
+        default y
+
+config GENERIC_CLOCKEVENTS
+        bool
+        default y
+
 config 64BIT
         def_bool y
 
@@ -34,10 +42,6 @@ config LOCKDEP_SUPPORT
         bool
         default y
 
-config TIME_INTERPOLATION
-        bool
-        default y
-
 config ARCH_MAY_HAVE_PC_FDC
         bool
         default y
@@ -113,6 +117,8 @@ config GENERIC_HARDIRQS
 
 menu "General machine setup"
 
+source "kernel/time/Kconfig"
+
 config SMP
         bool "Symmetric multi-processing support"
         ---help---