powerpc: Properly start decrementer on BookE secondary CPUs

This moves the code to start the decrementer on 40x and BookE into
a separate function which is now called from time_init() and
secondary_time_init(), before the respective clock sources are
registered. We also remove the 85xx specific code for doing it
from the platform code.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 22 insertions, 8 deletions

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index edb1edb36469..a180b4f9a4f6 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -727,6 +727,18 @@ static int __init get_freq(char *name, int cells, unsigned long *val)
         return found;
 }
 
+/* should become __cpuinit when secondary_cpu_time_init also is */
+void start_cpu_decrementer(void)
+{
+#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
+        /* Clear any pending timer interrupts */
+        mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
+
+        /* Enable decrementer interrupt */
+        mtspr(SPRN_TCR, TCR_DIE);
+#endif /* defined(CONFIG_BOOKE) || defined(CONFIG_40x) */
+}
+
 void __init generic_calibrate_decr(void)
 {
         ppc_tb_freq = DEFAULT_TB_FREQ;          /* hardcoded default */
@@ -746,14 +758,6 @@ void __init generic_calibrate_decr(void)
                 printk(KERN_ERR "WARNING: Estimating processor frequency "
                                 "(not found)\n");
         }
-
-#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
-        /* Clear any pending timer interrupts */
-        mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
-
-        /* Enable decrementer interrupt */
-        mtspr(SPRN_TCR, TCR_DIE);
-#endif
 }
 
 int update_persistent_clock(struct timespec now)
@@ -914,6 +918,11 @@ static void __init init_decrementer_clockevent(void)
 
 void secondary_cpu_time_init(void)
 {
+        /* Start the decrementer on CPUs that have manual control
+         * such as BookE
+         */
+        start_cpu_decrementer();
+
         /* FIME: Should make unrelatred change to move snapshot_timebase
          * call here ! */
         register_decrementer_clockevent(smp_processor_id());
@@ -1017,6 +1026,11 @@ void __init time_init(void)
 
         write_sequnlock_irqrestore(&xtime_lock, flags);
 
+        /* Start the decrementer on CPUs that have manual control
+         * such as BookE
+         */
+        start_cpu_decrementer();
+
         /* Register the clocksource, if we're not running on iSeries */
         if (!firmware_has_feature(FW_FEATURE_ISERIES))
                 clocksource_init();