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