1/*
2 * Copyright 2008 Freescale Semiconductor, Inc.
3 *
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.
8 */
9
10#include <linux/stddef.h>
11#include <linux/kernel.h>
12#include <linux/interrupt.h>
13#include <linux/of_irq.h>
14#include <linux/of_platform.h>
15
16#include <asm/mpic.h>
17#include <asm/i8259.h>
18
19#ifdef CONFIG_PPC_I8259
20static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
21{
22	struct irq_chip *chip = irq_desc_get_chip(desc);
23	unsigned int cascade_irq = i8259_irq();
24
25	if (cascade_irq != NO_IRQ)
26		generic_handle_irq(cascade_irq);
27
28	chip->irq_eoi(&desc->irq_data);
29}
30#endif	/* CONFIG_PPC_I8259 */
31
32void __init mpc86xx_init_irq(void)
33{
34#ifdef CONFIG_PPC_I8259
35	struct device_node *np;
36	struct device_node *cascade_node = NULL;
37	int cascade_irq;
38#endif
39
40	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
41			MPIC_SINGLE_DEST_CPU,
42			0, 256, " MPIC     ");
43	BUG_ON(mpic == NULL);
44
45	mpic_init(mpic);
46
47#ifdef CONFIG_PPC_I8259
48	/* Initialize i8259 controller */
49	for_each_node_by_type(np, "interrupt-controller")
50		if (of_device_is_compatible(np, "chrp,iic")) {
51			cascade_node = np;
52			break;
53		}
54
55	if (cascade_node == NULL) {
56		printk(KERN_DEBUG "Could not find i8259 PIC\n");
57		return;
58	}
59
60	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
61	if (cascade_irq == NO_IRQ) {
62		printk(KERN_ERR "Failed to map cascade interrupt\n");
63		return;
64	}
65
66	i8259_init(cascade_node, 0);
67	of_node_put(cascade_node);
68
69	irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);
70#endif
71}
72