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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/cobalt/irq.c
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/*

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 * IRQ vector handles

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 *

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle

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 */

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#include <linux/kernel.h>

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#include <linux/init.h>

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#include <linux/irq.h>

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#include <linux/interrupt.h>

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#include <linux/pci.h>

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#include <asm/i8259.h>

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#include <asm/irq_cpu.h>

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#include <asm/irq_gt641xx.h>

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#include <asm/gt64120.h>

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#include <irq.h>

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asmlinkage void plat_irq_dispatch(void)

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{

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	unsigned pending = read_c0_status() & read_c0_cause() & ST0_IM;

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	int irq;

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	if (pending & CAUSEF_IP2)

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		gt641xx_irq_dispatch();

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	else if (pending & CAUSEF_IP6) {

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		irq = i8259_irq();

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		if (irq < 0)

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			spurious_interrupt();

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		else

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			do_IRQ(irq);

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	} else if (pending & CAUSEF_IP3)

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		do_IRQ(MIPS_CPU_IRQ_BASE + 3);

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	else if (pending & CAUSEF_IP4)

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		do_IRQ(MIPS_CPU_IRQ_BASE + 4);

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	else if (pending & CAUSEF_IP5)

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		do_IRQ(MIPS_CPU_IRQ_BASE + 5);

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	else if (pending & CAUSEF_IP7)

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		do_IRQ(MIPS_CPU_IRQ_BASE + 7);

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	else

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		spurious_interrupt();

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}

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void __init arch_init_irq(void)

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{

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	mips_cpu_irq_init();

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	gt641xx_irq_init();

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	init_i8259_irqs();

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	if (request_irq(GT641XX_CASCADE_IRQ, no_action, IRQF_NO_THREAD,

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			"cascade", NULL)) {

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		pr_err("Failed to request irq %d (cascade)\n",

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		       GT641XX_CASCADE_IRQ);

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	}

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	if (request_irq(I8259_CASCADE_IRQ, no_action, IRQF_NO_THREAD,

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			"cascade", NULL)) {

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		pr_err("Failed to request irq %d (cascade)\n",

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		       I8259_CASCADE_IRQ);

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	}

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}

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