1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2008 Freescale Semiconductor, Inc.
4 */
5
6#include <linux/stddef.h>
7#include <linux/kernel.h>
8#include <linux/interrupt.h>
9#include <linux/of_irq.h>
10#include <linux/of_platform.h>
11
12#include <asm/mpic.h>
13#include <asm/i8259.h>
14
15#ifdef CONFIG_PPC_I8259
16static void mpc86xx_8259_cascade(struct irq_desc *desc)
17{
18	struct irq_chip *chip = irq_desc_get_chip(desc);
19	unsigned int cascade_irq = i8259_irq();
20
21	if (cascade_irq)
22		generic_handle_irq(cascade_irq);
23
24	chip->irq_eoi(&desc->irq_data);
25}
26#endif	/* CONFIG_PPC_I8259 */
27
28void __init mpc86xx_init_irq(void)
29{
30#ifdef CONFIG_PPC_I8259
31	struct device_node *np;
32	struct device_node *cascade_node = NULL;
33	int cascade_irq;
34#endif
35
36	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
37			MPIC_SINGLE_DEST_CPU,
38			0, 256, " MPIC     ");
39	BUG_ON(mpic == NULL);
40
41	mpic_init(mpic);
42
43#ifdef CONFIG_PPC_I8259
44	/* Initialize i8259 controller */
45	for_each_node_by_type(np, "interrupt-controller")
46		if (of_device_is_compatible(np, "chrp,iic")) {
47			cascade_node = np;
48			break;
49		}
50
51	if (cascade_node == NULL) {
52		printk(KERN_DEBUG "Could not find i8259 PIC\n");
53		return;
54	}
55
56	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
57	if (!cascade_irq) {
58		printk(KERN_ERR "Failed to map cascade interrupt\n");
59		return;
60	}
61
62	i8259_init(cascade_node, 0);
63	of_node_put(cascade_node);
64
65	irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);
66#endif
67}
68