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>
15 #include <asm/system.h>
17 #include <asm/i8259.h>
19 #ifdef CONFIG_PPC_I8259
20 static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
22 struct irq_chip *chip = irq_desc_get_chip(desc);
23 unsigned int cascade_irq = i8259_irq();
25 if (cascade_irq != NO_IRQ)
26 generic_handle_irq(cascade_irq);
28 chip->irq_eoi(&desc->irq_data);
30 #endif /* CONFIG_PPC_I8259 */
32 void __init mpc86xx_init_irq(void)
35 struct device_node *np;
37 #ifdef CONFIG_PPC_I8259
38 struct device_node *cascade_node = NULL;
42 /* Determine PIC address. */
43 np = of_find_node_by_type(NULL, "open-pic");
46 of_address_to_resource(np, 0, &res);
48 mpic = mpic_alloc(np, res.start,
49 MPIC_PRIMARY | MPIC_WANTS_RESET |
50 MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
58 #ifdef CONFIG_PPC_I8259
59 /* Initialize i8259 controller */
60 for_each_node_by_type(np, "interrupt-controller")
61 if (of_device_is_compatible(np, "chrp,iic")) {
66 if (cascade_node == NULL) {
67 printk(KERN_DEBUG "Could not find i8259 PIC\n");
71 cascade_irq = irq_of_parse_and_map(cascade_node, 0);
72 if (cascade_irq == NO_IRQ) {
73 printk(KERN_ERR "Failed to map cascade interrupt\n");
77 i8259_init(cascade_node, 0);
78 of_node_put(cascade_node);
80 irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);