sh: clockevent/clocksource/hrtimers/nohz TMU support.

This adds basic support for clockevents and clocksources,
presently only implemented for TMU-based systems (which
are the majority of SH-3 and SH-4 systems).

The old NO_IDLE_HZ implementation is also dropped completely,
the only users of this were on TMU-based systems anyways.

More work needs to be done to generalize the TMU handling,
in that the current implementation is rather tied to the
notion of TMU0 and TMU1 utilization.

Additionally, as more SH timers switch over to this scheme,
we'll be able to gut most of the remaining system timer
infrastructure that existed before.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 7 insertions, 22 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index d74eb120a9c6..038179ecf6a9 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -52,6 +52,9 @@ config GENERIC_IOMAP
 config GENERIC_TIME
         def_bool n
 
+config GENERIC_CLOCKEVENTS
+        def_bool n
+
 config SYS_SUPPORTS_APM_EMULATION
         bool
 
@@ -436,11 +439,11 @@ endmenu
 
 menu "Timer and clock configuration"
 
-if !GENERIC_TIME
-
 config SH_TMU
         bool "TMU timer support"
         depends on CPU_SH3 || CPU_SH4
+        select GENERIC_TIME
+        select GENERIC_CLOCKEVENTS
         default y
         help
           This enables the use of the TMU as the system timer.
@@ -459,8 +462,6 @@ config SH_MTU2
         help
           This enables the use of the MTU2 as the system timer.
 
-endif
-
 config SH_TIMER_IRQ
         int
         default "28" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785
@@ -468,24 +469,6 @@ config SH_TIMER_IRQ
         default "140" if CPU_SUBTYPE_SH7206
         default "16"
 
-config NO_IDLE_HZ
-        bool "Dynamic tick timer"
-        help
-          Select this option if you want to disable continuous timer ticks
-          and have them programmed to occur as required. This option saves
-          power as the system can remain in idle state for longer.
-
-          By default dynamic tick is disabled during the boot, and can be
-          manually enabled with:
-
-            echo 1 > /sys/devices/system/timer/timer0/dyn_tick
-
-          Alternatively, if you want dynamic tick automatically enabled
-          during boot, pass "dyntick=enable" via the kernel command string.
-
-          Please note that dynamic tick may affect the accuracy of
-          timekeeping on some platforms depending on the implementation.
-
 config SH_PCLK_FREQ
         int "Peripheral clock frequency (in Hz)"
         default "27000000" if CPU_SUBTYPE_SH73180 || CPU_SUBTYPE_SH7343
@@ -509,6 +492,8 @@ config SH_CLK_MD
         help
           MD2 - MD0 pin setting.
 
+source "kernel/time/Kconfig"
+
 endmenu
 
 menu "CPU Frequency scaling"