irq.c
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/*
* linux/arch/arm/mach-w90x900/irq.c
*
* based on linux/arch/arm/plat-s3c24xx/irq.c by Ben Dooks
*
* Copyright (c) 2008 Nuvoton technology corporation
* All rights reserved.
*
* Wan ZongShun <mcuos.com@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation;version 2 of the License.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/ptrace.h>
#include <linux/device.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <mach/hardware.h>
#include <mach/regs-irq.h>
#include "nuc9xx.h"
struct group_irq {
unsigned long gpen;
unsigned int enabled;
void (*enable)(struct group_irq *, int enable);
};
static DEFINE_SPINLOCK(groupirq_lock);
#define DEFINE_GROUP(_name, _ctrlbit, _num) \
struct group_irq group_##_name = { \
.enable = nuc900_group_enable, \
.gpen = ((1 << _num) - 1) << _ctrlbit, \
}
static void nuc900_group_enable(struct group_irq *gpirq, int enable);
static DEFINE_GROUP(nirq0, 0, 4);
static DEFINE_GROUP(nirq1, 4, 4);
static DEFINE_GROUP(usbh, 8, 2);
static DEFINE_GROUP(ottimer, 16, 3);
static DEFINE_GROUP(gdma, 20, 2);
static DEFINE_GROUP(sc, 24, 2);
static DEFINE_GROUP(i2c, 26, 2);
static DEFINE_GROUP(ps2, 28, 2);
static int group_irq_enable(struct group_irq *group_irq)
{
unsigned long flags;
spin_lock_irqsave(&groupirq_lock, flags);
if (group_irq->enabled++ == 0)
(group_irq->enable)(group_irq, 1);
spin_unlock_irqrestore(&groupirq_lock, flags);
return 0;
}
static void group_irq_disable(struct group_irq *group_irq)
{
unsigned long flags;
WARN_ON(group_irq->enabled == 0);
spin_lock_irqsave(&groupirq_lock, flags);
if (--group_irq->enabled == 0)
(group_irq->enable)(group_irq, 0);
spin_unlock_irqrestore(&groupirq_lock, flags);
}
static void nuc900_group_enable(struct group_irq *gpirq, int enable)
{
unsigned int groupen = gpirq->gpen;
unsigned long regval;
regval = __raw_readl(REG_AIC_GEN);
if (enable)
regval |= groupen;
else
regval &= ~groupen;
__raw_writel(regval, REG_AIC_GEN);
}
static void nuc900_irq_mask(struct irq_data *d)
{
struct group_irq *group_irq;
group_irq = NULL;
__raw_writel(1 << d->irq, REG_AIC_MDCR);
switch (d->irq) {
case IRQ_GROUP0:
group_irq = &group_nirq0;
break;
case IRQ_GROUP1:
group_irq = &group_nirq1;
break;
case IRQ_USBH:
group_irq = &group_usbh;
break;
case IRQ_T_INT_GROUP:
group_irq = &group_ottimer;
break;
case IRQ_GDMAGROUP:
group_irq = &group_gdma;
break;
case IRQ_SCGROUP:
group_irq = &group_sc;
break;
case IRQ_I2CGROUP:
group_irq = &group_i2c;
break;
case IRQ_P2SGROUP:
group_irq = &group_ps2;
break;
}
if (group_irq)
group_irq_disable(group_irq);
}
/*
* By the w90p910 spec,any irq,only write 1
* to REG_AIC_EOSCR for ACK
*/
static void nuc900_irq_ack(struct irq_data *d)
{
__raw_writel(0x01, REG_AIC_EOSCR);
}
static void nuc900_irq_unmask(struct irq_data *d)
{
struct group_irq *group_irq;
group_irq = NULL;
__raw_writel(1 << d->irq, REG_AIC_MECR);
switch (d->irq) {
case IRQ_GROUP0:
group_irq = &group_nirq0;
break;
case IRQ_GROUP1:
group_irq = &group_nirq1;
break;
case IRQ_USBH:
group_irq = &group_usbh;
break;
case IRQ_T_INT_GROUP:
group_irq = &group_ottimer;
break;
case IRQ_GDMAGROUP:
group_irq = &group_gdma;
break;
case IRQ_SCGROUP:
group_irq = &group_sc;
break;
case IRQ_I2CGROUP:
group_irq = &group_i2c;
break;
case IRQ_P2SGROUP:
group_irq = &group_ps2;
break;
}
if (group_irq)
group_irq_enable(group_irq);
}
static struct irq_chip nuc900_irq_chip = {
.irq_ack = nuc900_irq_ack,
.irq_mask = nuc900_irq_mask,
.irq_unmask = nuc900_irq_unmask,
};
void __init nuc900_init_irq(void)
{
int irqno;
__raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
irq_set_chip_and_handler(irqno, &nuc900_irq_chip,
handle_level_irq);
set_irq_flags(irqno, IRQF_VALID);
}
}