[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/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c
index cf55ecd..4fab3b2 100644
--- a/arch/mips/mips-boards/generic/time.c
+++ b/arch/mips/mips-boards/generic/time.c
@@ -31,6 +31,7 @@
 #include <asm/mipsregs.h>
 #include <asm/mipsmtregs.h>
 #include <asm/hardirq.h>
+#include <asm/i8253.h>
 #include <asm/irq.h>
 #include <asm/div64.h>
 #include <asm/cpu.h>
@@ -141,6 +142,9 @@
         cpu_khz = est_freq / 1000;
 
 	mips_scroll_message();
+#ifdef CONFIG_I8253		/* Only Malta has a PIT */
+	setup_pit_timer();
+#endif
 }
 
 //static irqreturn_t mips_perf_interrupt(int irq, void *dev_id)