1 files changed, 64 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_8259.c b/arch/powerpc/platforms/85xx/mpc85xx_8259.c
new file mode 100644
index 000000000000..cb00d596ad80
--- /dev/null
+++ b/arch/powerpc/platforms/85xx/mpc85xx_8259.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MPC85xx 8259 functions for DS Board Setup
+ *
+ * Author Xianghua Xiao (x.xiao@freescale.com)
+ * Roy Zang <tie-fei.zang@freescale.com>
+ *      - Add PCI/PCI Express support
+ * Copyright 2007 Freescale Semiconductor Inc.
+ */
+
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+#include <asm/mpic.h>
+#include <asm/i8259.h>
+
+#include "mpc85xx.h"
+
+static void mpc85xx_8259_cascade(struct irq_desc *desc)
+{
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	unsigned int cascade_irq = i8259_irq();
+
+	if (cascade_irq)
+		generic_handle_irq(cascade_irq);
+
+	chip->irq_eoi(&desc->irq_data);
+}
+
+void __init mpc85xx_8259_init(void)
+{
+	struct device_node *np;
+	struct device_node *cascade_node = NULL;
+	int cascade_irq;
+
+	/* Initialize the i8259 controller */
+	for_each_node_by_type(np, "interrupt-controller") {
+		if (of_device_is_compatible(np, "chrp,iic")) {
+			cascade_node = np;
+			break;
+		}
+	}
+
+	if (cascade_node == NULL) {
+		pr_debug("i8259: Could not find i8259 PIC\n");
+		return;
+	}
+
+	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
+	if (!cascade_irq) {
+		pr_err("i8259: Failed to map cascade interrupt\n");
+		return;
+	}
+
+	pr_debug("i8259: cascade mapped to irq %d\n", cascade_irq);
+
+	i8259_init(cascade_node, 0);
+	of_node_put(cascade_node);
+
+	irq_set_chained_handler(cascade_irq, mpc85xx_8259_cascade);
+}