1 files changed, 45 insertions, 0 deletions
diff --git a/arch/ia64/kernel/irq_lsapic.c b/arch/ia64/kernel/irq_lsapic.c
new file mode 100644
index 000000000..23bf4499a
--- /dev/null
+++ b/arch/ia64/kernel/irq_lsapic.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * LSAPIC Interrupt Controller
+ *
+ * This takes care of interrupts that are generated by the CPU's
+ * internal Streamlined Advanced Programmable Interrupt Controller
+ * (LSAPIC), such as the ITC and IPI interrupts.
+    *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 2000 Hewlett-Packard Co
+ * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#include <linux/sched.h>
+#include <linux/irq.h>
+
+static unsigned int
+lsapic_noop_startup (struct irq_data *data)
+{
+	return 0;
+}
+
+static void
+lsapic_noop (struct irq_data *data)
+{
+	/* nothing to do... */
+}
+
+static int lsapic_retrigger(struct irq_data *data)
+{
+	ia64_resend_irq(data->irq);
+
+	return 1;
+}
+
+struct irq_chip irq_type_ia64_lsapic = {
+	.name =			"LSAPIC",
+	.irq_startup =		lsapic_noop_startup,
+	.irq_shutdown =		lsapic_noop,
+	.irq_enable =		lsapic_noop,
+	.irq_disable =		lsapic_noop,
+	.irq_ack =		lsapic_noop,
+	.irq_retrigger =	lsapic_retrigger,
+};