2 * Copyright 2008 Freescale Semiconductor, Inc.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
10 #include <linux/stddef.h>
11 #include <linux/kernel.h>
12 #include <linux/interrupt.h>
13 #include <linux/of_platform.h>
16 #include <asm/i8259.h>
18 #ifdef CONFIG_PPC_I8259
19 static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
21 struct irq_chip *chip = irq_desc_get_chip(desc);
22 unsigned int cascade_irq = i8259_irq();
24 if (cascade_irq != NO_IRQ)
25 generic_handle_irq(cascade_irq);
27 chip->irq_eoi(&desc->irq_data);
29 #endif /* CONFIG_PPC_I8259 */
31 void __init mpc86xx_init_irq(void)
33 #ifdef CONFIG_PPC_I8259
34 struct device_node *np;
35 struct device_node *cascade_node = NULL;
39 struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
46 #ifdef CONFIG_PPC_I8259
47 /* Initialize i8259 controller */
48 for_each_node_by_type(np, "interrupt-controller")
49 if (of_device_is_compatible(np, "chrp,iic")) {
54 if (cascade_node == NULL) {
55 printk(KERN_DEBUG "Could not find i8259 PIC\n");
59 cascade_irq = irq_of_parse_and_map(cascade_node, 0);
60 if (cascade_irq == NO_IRQ) {
61 printk(KERN_ERR "Failed to map cascade interrupt\n");
65 i8259_init(cascade_node, 0);
66 of_node_put(cascade_node);
68 irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);