[MIPS] i8253 PIT clocksource and clockevent drivers

Derived from the i386 variant with a few x86 complexities chopped off.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/sni/time.c b/arch/mips/sni/time.c
index 92452d6..153f065 100644
--- a/arch/mips/sni/time.c
+++ b/arch/mips/sni/time.c
@@ -2,6 +2,7 @@
 #include <linux/interrupt.h>
 #include <linux/time.h>
 
+#include <asm/i8253.h>
 #include <asm/sni.h>
 #include <asm/time.h>
 #include <asm-generic/rtc.h>
@@ -116,6 +117,8 @@
 		(int) (r4k_tick % (500000 / HZ)));
 
 	mips_hpt_frequency = r4k_tick * HZ;
+
+	setup_pit_timer();
 }
 
 /*