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/*
* Copyright 2001 MontaVista Software Inc.
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
*
* Copyright (C) 2001 Ralf Baechle
* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
* Author: Maciej W. Rozycki <macro@mips.com>
*
* This file define the irq handler for MIPS CPU interrupts.
*
* 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.
*/
/*
* Almost all MIPS CPUs define 8 interrupt sources. They are typically
* level triggered (i.e., cannot be cleared from CPU; must be cleared from
* device). The first two are software interrupts which we don't really
* use or support. The last one is usually the CPU timer interrupt if
* counter register is present or, for CPUs with an external FPU, by
* convention it's the FPU exception interrupt.
*
* Don't even think about using this on SMP. You have been warned.
*
* This file exports one global function:
* void mips_cpu_irq_init(int irq_base);
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/mipsmtregs.h>
#include <asm/system.h>
static int mips_cpu_irq_base;
static inline void unmask_mips_irq(unsigned int irq)
{
set_c0_status(0x100 << (irq - mips_cpu_irq_base));
irq_enable_hazard();
}
static inline void mask_mips_irq(unsigned int irq)
{
clear_c0_status(0x100 << (irq - mips_cpu_irq_base));
irq_disable_hazard();
}
static struct irq_chip mips_cpu_irq_controller = {
.typename = "MIPS",
.ack = mask_mips_irq,
.mask = mask_mips_irq,
.mask_ack = mask_mips_irq,
.unmask = unmask_mips_irq,
.eoi = unmask_mips_irq,
};
/*
* Basically the same as above but taking care of all the MT stuff
*/
#define unmask_mips_mt_irq unmask_mips_irq
#define mask_mips_mt_irq mask_mips_irq
static unsigned int mips_mt_cpu_irq_startup(unsigned int irq)
{
unsigned int vpflags = dvpe();
clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
evpe(vpflags);
unmask_mips_mt_irq(irq);
return 0;
}
/*
* While we ack the interrupt interrupts are disabled and thus we don't need
* to deal with concurrency issues. Same for mips_cpu_irq_end.
*/
static void mips_mt_cpu_irq_ack(unsigned int irq)
{
unsigned int vpflags = dvpe();
clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
evpe(vpflags);
mask_mips_mt_irq(irq);
}
static struct irq_chip mips_mt_cpu_irq_controller = {
.typename = "MIPS",
.startup = mips_mt_cpu_irq_startup,
.ack = mips_mt_cpu_irq_ack,
.mask = mask_mips_mt_irq,
.mask_ack = mips_mt_cpu_irq_ack,
.unmask = unmask_mips_mt_irq,
.eoi = unmask_mips_mt_irq,
};
void __init mips_cpu_irq_init(int irq_base)
{
int i;
/* Mask interrupts. */
clear_c0_status(ST0_IM);
clear_c0_cause(CAUSEF_IP);
/*
* Only MT is using the software interrupts currently, so we just
* leave them uninitialized for other processors.
*/
if (cpu_has_mipsmt)
for (i = irq_base; i < irq_base + 2; i++)
set_irq_chip(i, &mips_mt_cpu_irq_controller);
for (i = irq_base + 2; i < irq_base + 8; i++)
set_irq_chip_and_handler(i, &mips_cpu_irq_controller,
handle_level_irq);
mips_cpu_irq_base = irq_base;
}
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