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_platform.h>
14
15 #include <asm/mpic.h>
16 #include <asm/i8259.h>
17
18 #ifdef CONFIG_PPC_I8259
mpc86xx_8259_cascade(unsigned int irq,struct irq_desc * desc)19 static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
20 {
21 struct irq_chip *chip = irq_desc_get_chip(desc);
22 unsigned int cascade_irq = i8259_irq();
23
24 if (cascade_irq != NO_IRQ)
25 generic_handle_irq(cascade_irq);
26
27 chip->irq_eoi(&desc->irq_data);
28 }
29 #endif /* CONFIG_PPC_I8259 */
30
mpc86xx_init_irq(void)31 void __init mpc86xx_init_irq(void)
32 {
33 #ifdef CONFIG_PPC_I8259
34 struct device_node *np;
35 struct device_node *cascade_node = NULL;
36 int cascade_irq;
37 #endif
38
39 struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
40 MPIC_SINGLE_DEST_CPU,
41 0, 256, " MPIC ");
42 BUG_ON(mpic == NULL);
43
44 mpic_init(mpic);
45
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")) {
50 cascade_node = np;
51 break;
52 }
53
54 if (cascade_node == NULL) {
55 printk(KERN_DEBUG "Could not find i8259 PIC\n");
56 return;
57 }
58
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");
62 return;
63 }
64
65 i8259_init(cascade_node, 0);
66 of_node_put(cascade_node);
67
68 irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);
69 #endif
70 }
71