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.h>
10#include <linux/of_irq.h>
11
12#include <asm/mpic.h>
13#include <asm/i8259.h>
14
15#include "mpc86xx.h"
16
17#ifdef CONFIG_PPC_I8259
18static void mpc86xx_8259_cascade(struct irq_desc *desc)
19{
20	struct irq_chip *chip = irq_desc_get_chip(desc);
21	unsigned int cascade_irq = i8259_irq();
22
23	if (cascade_irq)
24		generic_handle_irq(cascade_irq);
25
26	chip->irq_eoi(&desc->irq_data);
27}
28#endif	/* CONFIG_PPC_I8259 */
29
30void __init mpc86xx_init_irq(void)
31{
32#ifdef CONFIG_PPC_I8259
33	struct device_node *np;
34	struct device_node *cascade_node = NULL;
35	int cascade_irq;
36#endif
37
38	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
39			MPIC_SINGLE_DEST_CPU,
40			0, 256, " MPIC     ");
41	BUG_ON(mpic == NULL);
42
43	mpic_init(mpic);
44
45#ifdef CONFIG_PPC_I8259
46	/* Initialize i8259 controller */
47	for_each_node_by_type(np, "interrupt-controller")
48		if (of_device_is_compatible(np, "chrp,iic")) {
49			cascade_node = np;
50			break;
51		}
52
53	if (cascade_node == NULL) {
54		printk(KERN_DEBUG "Could not find i8259 PIC\n");
55		return;
56	}
57
58	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
59	if (!cascade_irq) {
60		printk(KERN_ERR "Failed to map cascade interrupt\n");
61		return;
62	}
63
64	i8259_init(cascade_node, 0);
65	of_node_put(cascade_node);
66
67	irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);
68#endif
69}
70