Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c
new file mode 100644
index 000000000..df7ddd246
--- /dev/null
+++ b/arch/mips/kernel/i8253.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * i8253.c  8253/PIT functions
+ *
+ */
+#include <linux/clockchips.h>
+#include <linux/i8253.h>
+#include <linux/export.h>
+#include <linux/smp.h>
+#include <linux/irq.h>
+
+#include <asm/time.h>
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
+{
+	i8253_clockevent.event_handler(&i8253_clockevent);
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction irq0  = {
+	.handler = timer_interrupt,
+	.flags = IRQF_NOBALANCING | IRQF_TIMER,
+	.name = "timer"
+};
+
+void __init setup_pit_timer(void)
+{
+	clockevent_i8253_init(true);
+	setup_irq(0, &irq0);
+}
+
+static int __init init_pit_clocksource(void)
+{
+	if (num_possible_cpus() > 1 || /* PIT does not scale! */
+	    !clockevent_state_periodic(&i8253_clockevent))
+		return 0;
+
+	return clocksource_i8253_init();
+}
+arch_initcall(init_pit_clocksource);