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/*
* arch/arm/mach-ns9xxx/irq.c
*
* Copyright (C) 2006,2007 by Digi International Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/io.h>
#include <asm/mach/irq.h>
#include <mach/regs-sys-common.h>
#include <mach/irqs.h>
#include <mach/board.h>
#include "generic.h"
/* simple interrupt prio table: prio(x) < prio(y) <=> x < y */
#define irq2prio(i) (i)
#define prio2irq(p) (p)
static void ns9xxx_mask_irq(struct irq_data *d)
{
/* XXX: better use cpp symbols */
int prio = irq2prio(d->irq);
u32 ic = __raw_readl(SYS_IC(prio / 4));
ic &= ~(1 << (7 + 8 * (3 - (prio & 3))));
__raw_writel(ic, SYS_IC(prio / 4));
}
static void ns9xxx_eoi_irq(struct irq_data *d)
{
__raw_writel(0, SYS_ISRADDR);
}
static void ns9xxx_unmask_irq(struct irq_data *d)
{
/* XXX: better use cpp symbols */
int prio = irq2prio(d->irq);
u32 ic = __raw_readl(SYS_IC(prio / 4));
ic |= 1 << (7 + 8 * (3 - (prio & 3)));
__raw_writel(ic, SYS_IC(prio / 4));
}
static struct irq_chip ns9xxx_chip = {
.irq_eoi = ns9xxx_eoi_irq,
.irq_mask = ns9xxx_mask_irq,
.irq_unmask = ns9xxx_unmask_irq,
};
void __init ns9xxx_init_irq(void)
{
int i;
/* disable all IRQs */
for (i = 0; i < 8; ++i)
__raw_writel(prio2irq(4 * i) << 24 |
prio2irq(4 * i + 1) << 16 |
prio2irq(4 * i + 2) << 8 |
prio2irq(4 * i + 3),
SYS_IC(i));
for (i = 0; i < 32; ++i)
__raw_writel(prio2irq(i), SYS_IVA(i));
for (i = 0; i <= 31; ++i) {
set_irq_chip(i, &ns9xxx_chip);
set_irq_handler(i, handle_fasteoi_irq);
set_irq_flags(i, IRQF_VALID);
irq_set_status_flags(i, IRQ_LEVEL);
}
}
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