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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/kernel.h>
#include <linux/module.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
static int irq_base;
static inline void unmask_rm9k_irq(unsigned int irq)
{
set_c0_intcontrol(0x1000 << (irq - irq_base));
}
static inline void mask_rm9k_irq(unsigned int irq)
{
clear_c0_intcontrol(0x1000 << (irq - irq_base));
}
static inline void rm9k_cpu_irq_enable(unsigned int irq)
{
unsigned long flags;
local_irq_save(flags);
unmask_rm9k_irq(irq);
local_irq_restore(flags);
}
static void rm9k_cpu_irq_disable(unsigned int irq)
{
unsigned long flags;
local_irq_save(flags);
mask_rm9k_irq(irq);
local_irq_restore(flags);
}
static unsigned int rm9k_cpu_irq_startup(unsigned int irq)
{
rm9k_cpu_irq_enable(irq);
return 0;
}
#define rm9k_cpu_irq_shutdown rm9k_cpu_irq_disable
/*
* Performance counter interrupts are global on all processors.
*/
static void local_rm9k_perfcounter_irq_startup(void *args)
{
unsigned int irq = (unsigned int) args;
rm9k_cpu_irq_enable(irq);
}
static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
{
on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 0, 1);
return 0;
}
static void local_rm9k_perfcounter_irq_shutdown(void *args)
{
unsigned int irq = (unsigned int) args;
unsigned long flags;
local_irq_save(flags);
mask_rm9k_irq(irq);
local_irq_restore(flags);
}
static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
{
on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 0, 1);
}
/*
* While we ack the interrupt interrupts are disabled and thus we don't need
* to deal with concurrency issues. Same for rm9k_cpu_irq_end.
*/
static void rm9k_cpu_irq_ack(unsigned int irq)
{
mask_rm9k_irq(irq);
}
static void rm9k_cpu_irq_end(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
unmask_rm9k_irq(irq);
}
static struct irq_chip rm9k_irq_controller = {
.typename = "RM9000",
.startup = rm9k_cpu_irq_startup,
.shutdown = rm9k_cpu_irq_shutdown,
.enable = rm9k_cpu_irq_enable,
.disable = rm9k_cpu_irq_disable,
.ack = rm9k_cpu_irq_ack,
.end = rm9k_cpu_irq_end,
};
static struct irq_chip rm9k_perfcounter_irq = {
.typename = "RM9000",
.startup = rm9k_perfcounter_irq_startup,
.shutdown = rm9k_perfcounter_irq_shutdown,
.enable = rm9k_cpu_irq_enable,
.disable = rm9k_cpu_irq_disable,
.ack = rm9k_cpu_irq_ack,
.end = rm9k_cpu_irq_end,
};
unsigned int rm9000_perfcount_irq;
EXPORT_SYMBOL(rm9000_perfcount_irq);
void __init rm9k_cpu_irq_init(int base)
{
int i;
clear_c0_intcontrol(0x0000f000); /* Mask all */
for (i = base; i < base + 4; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = NULL;
irq_desc[i].depth = 1;
irq_desc[i].chip = &rm9k_irq_controller;
}
rm9000_perfcount_irq = base + 1;
irq_desc[rm9000_perfcount_irq].chip = &rm9k_perfcounter_irq;
irq_base = base;
}
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