[PATCH] powerpc: Add support for Book-E timer config to generic_calibrate_decr
We need to initialize some control SPRS for timers on Book-E before
we start taking decrementer interrupts.
Signed-off-by: Kumar K. Gala <kumar.gala@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 82f2cab..9f264c2 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -610,6 +610,17 @@
ppc_proc_freq = *fp;
}
}
+#ifdef CONFIG_BOOKE
+ /* Set the time base to zero */
+ mtspr(SPRN_TBWL, 0);
+ mtspr(SPRN_TBWU, 0);
+
+ /* 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
if (!node_found)
printk(KERN_ERR "WARNING: Estimating processor frequency "
"(not found)\n");