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/*
* Copyright (C) 2003 Ralf Baechle
*
* 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; either version 2 of the License, or (at your
* option) any later version.
*
* Handler for RM9000 extended interrupts. These are a non-standard
* feature so we handle them separately from standard interrupts.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
static inline void unmask_rm9k_irq(struct irq_data *d)
{
set_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
}
static inline void mask_rm9k_irq(struct irq_data *d)
{
clear_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
}
static inline void rm9k_cpu_irq_enable(struct irq_data *d)
{
unsigned long flags;
local_irq_save(flags);
unmask_rm9k_irq(d);
local_irq_restore(flags);
}
/*
* Performance counter interrupts are global on all processors.
*/
static void local_rm9k_perfcounter_irq_startup(void *args)
{
rm9k_cpu_irq_enable(args);
}
static unsigned int rm9k_perfcounter_irq_startup(struct irq_data *d)
{
on_each_cpu(local_rm9k_perfcounter_irq_startup, d, 1);
return 0;
}
static void local_rm9k_perfcounter_irq_shutdown(void *args)
{
unsigned long flags;
local_irq_save(flags);
mask_rm9k_irq(args);
local_irq_restore(flags);
}
static void rm9k_perfcounter_irq_shutdown(struct irq_data *d)
{
on_each_cpu(local_rm9k_perfcounter_irq_shutdown, d, 1);
}
static struct irq_chip rm9k_irq_controller = {
.name = "RM9000",
.irq_ack = mask_rm9k_irq,
.irq_mask = mask_rm9k_irq,
.irq_mask_ack = mask_rm9k_irq,
.irq_unmask = unmask_rm9k_irq,
.irq_eoi = unmask_rm9k_irq
};
static struct irq_chip rm9k_perfcounter_irq = {
.name = "RM9000",
.irq_startup = rm9k_perfcounter_irq_startup,
.irq_shutdown = rm9k_perfcounter_irq_shutdown,
.irq_ack = mask_rm9k_irq,
.irq_mask = mask_rm9k_irq,
.irq_mask_ack = mask_rm9k_irq,
.irq_unmask = unmask_rm9k_irq,
};
unsigned int rm9000_perfcount_irq;
EXPORT_SYMBOL(rm9000_perfcount_irq);
void __init rm9k_cpu_irq_init(void)
{
int base = RM9K_CPU_IRQ_BASE;
int i;
clear_c0_intcontrol(0x0000f000); /* Mask all */
for (i = base; i < base + 4; i++)
irq_set_chip_and_handler(i, &rm9k_irq_controller,
handle_level_irq);
rm9000_perfcount_irq = base + 1;
irq_set_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
handle_percpu_irq);
}
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