sparc: Convert sparc to use read/update_persistent_clock

This patch converts the sparc architecture to use the generic
read_persistent_clock and update_persistent_clock interfaces, reducing
the amount of arch specific code we have to maintain, and allowing for
further cleanups in the future.

[ davem: compile fix: Here's a version that compiles, you have to get
  rid of the now unused variably last_rtc_update since we build with
  -Werror ]
 
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 6 insertions, 14 deletions

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 4097f6a10860..0e8ec2ad8477 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -72,7 +72,7 @@ config ARCH_USES_GETTIMEOFFSET
 
 config GENERIC_CMOS_UPDATE
         bool
-        default y if SPARC64
+        default y
 
 config GENERIC_CLOCKEVENTS
         bool
diff --git a/arch/sparc/kernel/time_32.c b/arch/sparc/kernel/time_32.c
index 0d4c09b15efc..4453003032b5 100644
--- a/arch/sparc/kernel/time_32.c
+++ b/arch/sparc/kernel/time_32.c
@@ -78,6 +78,11 @@ __volatile__ unsigned int *master_l10_counter;
 
 u32 (*do_arch_gettimeoffset)(void);
 
+int update_persistent_clock(struct timespec now)
+{
+        return set_rtc_mmss(now.tv_sec);
+}
+
 /*
  * timer_interrupt() needs to keep up the real-time clock,
  * as well as call the "do_timer()" routine every clocktick
@@ -87,9 +92,6 @@ u32 (*do_arch_gettimeoffset)(void);
 
 static irqreturn_t timer_interrupt(int dummy, void *dev_id)
 {
-        /* last time the cmos clock got updated */
-        static long last_rtc_update;
-
 #ifndef CONFIG_SMP
         profile_tick(CPU_PROFILING);
 #endif
@@ -101,16 +103,6 @@ static irqreturn_t timer_interrupt(int dummy, void *dev_id)
 
         do_timer(1);
 
-        /* Determine when to update the Mostek clock. */
-        if (ntp_synced() &&
-            xtime.tv_sec > last_rtc_update + 660 &&
-            (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
-            (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
-          if (set_rtc_mmss(xtime.tv_sec) == 0)
-            last_rtc_update = xtime.tv_sec;
-          else
-            last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
-        }
         write_sequnlock(&xtime_lock);
 
 #ifndef CONFIG_SMP