[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/qemu/q-setup.c b/arch/mips/qemu/q-setup.c
index 89a2076..23d34c1 100644
--- a/arch/mips/qemu/q-setup.c
+++ b/arch/mips/qemu/q-setup.c
@@ -1,4 +1,6 @@
 #include <linux/init.h>
+
+#include <asm/i8253.h>
 #include <asm/io.h>
 #include <asm/time.h>
 
@@ -11,12 +13,9 @@
 	return "Qemu";
 }
 
-void __init plat_timer_setup(struct irqaction *irq)
+void __init plat_time_init(void)
 {
-	/* set the clock to 100 Hz */
-	outb_p(0x34,0x43);		/* binary, mode 2, LSB/MSB, ch 0 */
-	outb_p(LATCH & 0xff , 0x40);	/* LSB */
-	outb(LATCH >> 8 , 0x40);	/* MSB */
+	setup_pit_timer();
 }
 
 void __init plat_mem_setup(void)