1 /*
2 * linux/arch/arm/mach-mmp/irq.c
3 *
4 * Generic IRQ handling, GPIO IRQ demultiplexing, etc.
5 *
6 * Author: Bin Yang <bin.yang@marvell.com>
7 * Created: Sep 30, 2008
8 * Copyright: Marvell International Ltd.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/init.h>
16 #include <linux/irq.h>
17 #include <linux/io.h>
18
19 #include <mach/regs-icu.h>
20
21 #include "common.h"
22
23 #define IRQ_ROUTE_TO_AP (ICU_INT_CONF_AP_INT | ICU_INT_CONF_IRQ)
24
25 #define PRIORITY_DEFAULT 0x1
26 #define PRIORITY_NONE 0x0 /* means IRQ disabled */
27
icu_mask_irq(struct irq_data * d)28 static void icu_mask_irq(struct irq_data *d)
29 {
30 __raw_writel(PRIORITY_NONE, ICU_INT_CONF(d->irq));
31 }
32
icu_unmask_irq(struct irq_data * d)33 static void icu_unmask_irq(struct irq_data *d)
34 {
35 __raw_writel(IRQ_ROUTE_TO_AP | PRIORITY_DEFAULT, ICU_INT_CONF(d->irq));
36 }
37
38 static struct irq_chip icu_irq_chip = {
39 .name = "icu_irq",
40 .irq_ack = icu_mask_irq,
41 .irq_mask = icu_mask_irq,
42 .irq_unmask = icu_unmask_irq,
43 };
44
icu_init_irq(void)45 void __init icu_init_irq(void)
46 {
47 int irq;
48
49 for (irq = 0; irq < 64; irq++) {
50 icu_mask_irq(irq_get_irq_data(irq));
51 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
52 set_irq_flags(irq, IRQF_VALID);
53 }
54 }
55