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, 4 insertions, 21 deletions

diff --git a/include/asm-sh/timer.h b/include/asm-sh/timer.h
index 17b5e76a4c31..701ba84c7049 100644
--- a/include/asm-sh/timer.h
+++ b/include/asm-sh/timer.h
@@ -2,12 +2,14 @@
 #define __ASM_SH_TIMER_H
 
 #include <linux/sysdev.h>
+#include <linux/clocksource.h>
 #include <asm/cpu/timer.h>
 
 struct sys_timer_ops {
         int (*init)(void);
         int (*start)(void);
         int (*stop)(void);
+        cycle_t (*read)(void);
 #ifndef CONFIG_GENERIC_TIME
         unsigned long (*get_offset)(void);
 #endif
@@ -18,29 +20,8 @@ struct sys_timer {
 
         struct sys_device       dev;
         struct sys_timer_ops    *ops;
-
-#ifdef CONFIG_NO_IDLE_HZ
-        struct dyn_tick_timer   *dyn_tick;
-#endif
 };
 
-#ifdef CONFIG_NO_IDLE_HZ
-#define DYN_TICK_ENABLED        (1 << 1)
-
-struct dyn_tick_timer {
-        spinlock_t      lock;
-        unsigned int    state;                  /* Current state */
-        int             (*enable)(void);        /* Enables dynamic tick */
-        int             (*disable)(void);       /* Disables dynamic tick */
-        void            (*reprogram)(unsigned long); /* Reprograms the timer */
-        int             (*handler)(int, void *);
-};
-
-void timer_dyn_reprogram(void);
-#else
-#define timer_dyn_reprogram()   do { } while (0)
-#endif
-
 #define TICK_SIZE (tick_nsec / 1000)
 
 extern struct sys_timer tmu_timer, cmt_timer, mtu2_timer;
@@ -58,5 +39,7 @@ struct sys_timer *get_sys_timer(void);
 
 /* arch/sh/kernel/time.c */
 void handle_timer_tick(void);
+extern unsigned long sh_hpt_frequency;
+extern struct clocksource clocksource_sh;
 
 #endif /* __ASM_SH_TIMER_H */