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
mpc86xx_8259_cascade(struct irq_desc * desc)20 static void mpc86xx_8259_cascade(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
mpc86xx_init_irq(void)32 void __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