/*
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* Interrupt handing routines for NEC VR4100 series.
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*
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* Copyright (C) 2005-2007 Yoichi Yuasa <yuasa@linux-mips.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/export.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <asm/irq_cpu.h>
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#include <asm/vr41xx/irq.h>
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typedef struct irq_cascade {
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int (*get_irq)(unsigned int);
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} irq_cascade_t;
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static irq_cascade_t irq_cascade[NR_IRQS] __cacheline_aligned;
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static struct irqaction cascade_irqaction = {
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.handler = no_action,
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.name = "cascade",
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.flags = IRQF_NO_THREAD,
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};
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int cascade_irq(unsigned int irq, int (*get_irq)(unsigned int))
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{
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int retval = 0;
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if (irq >= NR_IRQS)
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return -EINVAL;
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if (irq_cascade[irq].get_irq != NULL)
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free_irq(irq, NULL);
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irq_cascade[irq].get_irq = get_irq;
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if (get_irq != NULL) {
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retval = setup_irq(irq, &cascade_irqaction);
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if (retval < 0)
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irq_cascade[irq].get_irq = NULL;
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}
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return retval;
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}
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EXPORT_SYMBOL_GPL(cascade_irq);
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static void irq_dispatch(unsigned int irq)
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{
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irq_cascade_t *cascade;
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if (irq >= NR_IRQS) {
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atomic_inc(&irq_err_count);
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return;
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}
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cascade = irq_cascade + irq;
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if (cascade->get_irq != NULL) {
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struct irq_desc *desc = irq_to_desc(irq);
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struct irq_data *idata = irq_desc_get_irq_data(desc);
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struct irq_chip *chip = irq_desc_get_chip(desc);
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int ret;
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if (chip->irq_mask_ack)
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chip->irq_mask_ack(idata);
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else {
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chip->irq_mask(idata);
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chip->irq_ack(idata);
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}
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ret = cascade->get_irq(irq);
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irq = ret;
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if (ret < 0)
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atomic_inc(&irq_err_count);
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else
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irq_dispatch(irq);
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if (!irqd_irq_disabled(idata) && chip->irq_unmask)
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chip->irq_unmask(idata);
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} else
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do_IRQ(irq);
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}
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asmlinkage void plat_irq_dispatch(void)
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{
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unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
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if (pending & CAUSEF_IP7)
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do_IRQ(TIMER_IRQ);
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else if (pending & 0x7800) {
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if (pending & CAUSEF_IP3)
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irq_dispatch(INT1_IRQ);
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else if (pending & CAUSEF_IP4)
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irq_dispatch(INT2_IRQ);
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else if (pending & CAUSEF_IP5)
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irq_dispatch(INT3_IRQ);
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else if (pending & CAUSEF_IP6)
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irq_dispatch(INT4_IRQ);
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} else if (pending & CAUSEF_IP2)
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irq_dispatch(INT0_IRQ);
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else if (pending & CAUSEF_IP0)
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do_IRQ(MIPS_SOFTINT0_IRQ);
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else if (pending & CAUSEF_IP1)
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do_IRQ(MIPS_SOFTINT1_IRQ);
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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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}
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