1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * MPC85xx 8259 functions for DS Board Setup
5 * Author Xianghua Xiao (x.xiao@freescale.com)
6 * Roy Zang <tie-fei.zang@freescale.com>
7 * - Add PCI/PCI Express support
8 * Copyright 2007 Freescale Semiconductor Inc.
11 #include <linux/stddef.h>
12 #include <linux/kernel.h>
13 #include <linux/interrupt.h>
14 #include <linux/of_irq.h>
15 #include <linux/of_platform.h>
18 #include <asm/i8259.h>
22 static void mpc85xx_8259_cascade(struct irq_desc *desc)
24 struct irq_chip *chip = irq_desc_get_chip(desc);
25 unsigned int cascade_irq = i8259_irq();
28 generic_handle_irq(cascade_irq);
30 chip->irq_eoi(&desc->irq_data);
33 void __init mpc85xx_8259_init(void)
35 struct device_node *np;
36 struct device_node *cascade_node = NULL;
39 /* Initialize the i8259 controller */
40 for_each_node_by_type(np, "interrupt-controller") {
41 if (of_device_is_compatible(np, "chrp,iic")) {
47 if (cascade_node == NULL) {
48 pr_debug("i8259: Could not find i8259 PIC\n");
52 cascade_irq = irq_of_parse_and_map(cascade_node, 0);
54 pr_err("i8259: Failed to map cascade interrupt\n");
58 pr_debug("i8259: cascade mapped to irq %d\n", cascade_irq);
60 i8259_init(cascade_node, 0);
61 of_node_put(cascade_node);
63 irq_set_chained_handler(cascade_irq, mpc85xx_8259_cascade);