1/*
 2 * linux/arch/arm/mach-nuc93x/irq.c
 3 *
 4 * Copyright (c) 2008 Nuvoton technology corporation.
 5 *
 6 * Wan ZongShun <mcuos.com@gmail.com>
 7 *
 8 * This program is free software; you can redistribute it and/or modify
 9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation;version 2 of the License.
11 *
12 */
13
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/interrupt.h>
17#include <linux/ioport.h>
18#include <linux/ptrace.h>
19#include <linux/sysdev.h>
20#include <linux/io.h>
21
22#include <asm/irq.h>
23#include <asm/mach/irq.h>
24
25#include <mach/hardware.h>
26#include <mach/regs-irq.h>
27
28static void nuc93x_irq_mask(struct irq_data *d)
29{
30	__raw_writel(1 << d->irq, REG_AIC_MDCR);
31}
32
33/*
34 * By the w90p910 spec,any irq,only write 1
35 * to REG_AIC_EOSCR for ACK
36 */
37
38static void nuc93x_irq_ack(struct irq_data *d)
39{
40	__raw_writel(0x01, REG_AIC_EOSCR);
41}
42
43static void nuc93x_irq_unmask(struct irq_data *d)
44{
45	__raw_writel(1 << d->irq, REG_AIC_MECR);
46
47}
48
49static struct irq_chip nuc93x_irq_chip = {
50	.irq_ack	= nuc93x_irq_ack,
51	.irq_mask	= nuc93x_irq_mask,
52	.irq_unmask	= nuc93x_irq_unmask,
53};
54
55void __init nuc93x_init_irq(void)
56{
57	int irqno;
58
59	__raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
60
61	for (irqno = IRQ_WDT; irqno <= NR_IRQS; irqno++) {
62		irq_set_chip_and_handler(irqno, &nuc93x_irq_chip,
63					 handle_level_irq);
64		set_irq_flags(irqno, IRQF_VALID);
65	}
66}