1 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm/mach-footbridge/isa-timer.c b/arch/arm/mach-footbridge/isa-timer.c
new file mode 100644
index 000000000..723e3eae9
--- /dev/null
+++ b/arch/arm/mach-footbridge/isa-timer.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/arch/arm/mach-footbridge/isa-timer.c
+ *
+ *  Copyright (C) 1998 Russell King.
+ *  Copyright (C) 1998 Phil Blundell
+ */
+#include <linux/clockchips.h>
+#include <linux/i8253.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/spinlock.h>
+#include <linux/timex.h>
+
+#include <asm/irq.h>
+#include <asm/mach/time.h>
+
+#include "common.h"
+
+static irqreturn_t pit_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *ce = dev_id;
+	ce->event_handler(ce);
+	return IRQ_HANDLED;
+}
+
+void __init isa_timer_init(void)
+{
+	clocksource_i8253_init();
+
+	if (request_irq(i8253_clockevent.irq, pit_timer_interrupt,
+			IRQF_TIMER | IRQF_IRQPOLL, "pit", &i8253_clockevent))
+		pr_err("Failed to request irq %d(pit)\n", i8253_clockevent.irq);
+	clockevent_i8253_init(false);
+}