[ARM] pxa: add base support for Marvell's PXA168 processor line
[linux-3.10.git] / arch / arm / mach-mmp / irq.c
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
28 static void icu_mask_irq(unsigned int irq)
29 {
30         __raw_writel(PRIORITY_NONE, ICU_INT_CONF(irq));
31 }
32
33 static void icu_unmask_irq(unsigned int irq)
34 {
35         __raw_writel(IRQ_ROUTE_TO_AP | PRIORITY_DEFAULT, ICU_INT_CONF(irq));
36 }
37
38 static struct irq_chip icu_irq_chip = {
39         .name   = "icu_irq",
40         .ack    = icu_mask_irq,
41         .mask   = icu_mask_irq,
42         .unmask = icu_unmask_irq,
43 };
44
45 void __init icu_init_irq(void)
46 {
47         int irq;
48
49         for (irq = 0; irq < 64; irq++) {
50                 icu_mask_irq(irq);
51                 set_irq_chip(irq, &icu_irq_chip);
52                 set_irq_handler(irq, handle_level_irq);
53                 set_irq_flags(irq, IRQF_VALID);
54         }
55 }