sh: First step at generic timeofday support.

At the moment we wrap GENERIC_TIME around our existing timer API.
As boards start providing their own clocksources, they're able to
select GENERIC_TIME accordingly and optimize out most of the timer
API.

Once the current timers have been reworked as proper clocksource
drivers, the rest of the place holders for the timer API can go
away and we can flip on GENERIC_TIME unconditionally.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -45,6 +45,9 @@ config GENERIC_CALIBRATE_DELAY
 config GENERIC_IOMAP
 	bool
 
+config GENERIC_TIME
+	def_bool n
+
 config ARCH_MAY_HAVE_PC_FDC
 	bool
 
@@ -357,6 +360,7 @@ config CPU_HAS_SR_RB
 endmenu
 
 menu "Timer support"
+depends on !GENERIC_TIME
 
 config SH_TMU
 	bool "TMU timer support"

arch/sh/kernel/time.c

@@ -47,6 +47,7 @@ unsigned long long __attribute__ ((weak)) sched_clock(void)
 	return (unsigned long long)jiffies * (1000000000 / HZ);
 }
 
+#ifndef CONFIG_GENERIC_TIME
 void do_gettimeofday(struct timeval *tv)
 {
 	unsigned long seq;
@@ -99,6 +100,7 @@ int do_settimeofday(struct timespec *tv)
 	return 0;
 }
 EXPORT_SYMBOL(do_settimeofday);
+#endif /* !CONFIG_GENERIC_TIME */
 
 /* last time the RTC clock got updated */
 static long last_rtc_update;

include/asm-sh/timer.h

@@ -8,7 +8,9 @@ struct sys_timer_ops {
 	int (*init)(void);
 	int (*start)(void);
 	int (*stop)(void);
+#ifndef CONFIG_GENERIC_TIME
 	unsigned long (*get_offset)(void);
+#endif
 	unsigned long (*get_frequency)(void);
 };
 
@@ -24,10 +26,12 @@ struct sys_timer {
 extern struct sys_timer tmu_timer;
 extern struct sys_timer *sys_timer;
 
+#ifndef CONFIG_GENERIC_TIME
 static inline unsigned long get_timer_offset(void)
 {
 	return sys_timer->ops->get_offset();
 }
+#endif
 
 static inline unsigned long get_timer_frequency(void)
 {