mirror of https://gitee.com/openkylin/linux.git
116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/*
|
|
* Interrupt handing routines for NEC VR4100 series.
|
|
*
|
|
* Copyright (C) 2005 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/irq_cpu.h>
|
|
#include <asm/system.h>
|
|
#include <asm/vr41xx/vr41xx.h>
|
|
|
|
typedef struct irq_cascade {
|
|
int (*get_irq)(unsigned int, struct pt_regs *);
|
|
} irq_cascade_t;
|
|
|
|
static irq_cascade_t irq_cascade[NR_IRQS] __cacheline_aligned;
|
|
|
|
static struct irqaction cascade_irqaction = {
|
|
.handler = no_action,
|
|
.mask = CPU_MASK_NONE,
|
|
.name = "cascade",
|
|
};
|
|
|
|
int cascade_irq(unsigned int irq, int (*get_irq)(unsigned int, struct pt_regs *))
|
|
{
|
|
int retval = 0;
|
|
|
|
if (irq >= NR_IRQS)
|
|
return -EINVAL;
|
|
|
|
if (irq_cascade[irq].get_irq != NULL)
|
|
free_irq(irq, NULL);
|
|
|
|
irq_cascade[irq].get_irq = get_irq;
|
|
|
|
if (get_irq != NULL) {
|
|
retval = setup_irq(irq, &cascade_irqaction);
|
|
if (retval < 0)
|
|
irq_cascade[irq].get_irq = NULL;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(cascade_irq);
|
|
|
|
static void irq_dispatch(unsigned int irq, struct pt_regs *regs)
|
|
{
|
|
irq_cascade_t *cascade;
|
|
irq_desc_t *desc;
|
|
|
|
if (irq >= NR_IRQS) {
|
|
atomic_inc(&irq_err_count);
|
|
return;
|
|
}
|
|
|
|
cascade = irq_cascade + irq;
|
|
if (cascade->get_irq != NULL) {
|
|
unsigned int source_irq = irq;
|
|
desc = irq_desc + source_irq;
|
|
desc->handler->ack(source_irq);
|
|
irq = cascade->get_irq(irq, regs);
|
|
if (irq < 0)
|
|
atomic_inc(&irq_err_count);
|
|
else
|
|
irq_dispatch(irq, regs);
|
|
desc->handler->end(source_irq);
|
|
} else
|
|
do_IRQ(irq, regs);
|
|
}
|
|
|
|
asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
|
|
{
|
|
unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
|
|
|
|
if (pending & CAUSEF_IP7)
|
|
do_IRQ(7, regs);
|
|
else if (pending & 0x7800) {
|
|
if (pending & CAUSEF_IP3)
|
|
irq_dispatch(3, regs);
|
|
else if (pending & CAUSEF_IP4)
|
|
irq_dispatch(4, regs);
|
|
else if (pending & CAUSEF_IP5)
|
|
irq_dispatch(5, regs);
|
|
else if (pending & CAUSEF_IP6)
|
|
irq_dispatch(6, regs);
|
|
} else if (pending & CAUSEF_IP2)
|
|
irq_dispatch(2, regs);
|
|
else if (pending & CAUSEF_IP0)
|
|
do_IRQ(0, regs);
|
|
else if (pending & CAUSEF_IP1)
|
|
do_IRQ(1, regs);
|
|
else
|
|
spurious_interrupt(regs);
|
|
}
|
|
|
|
void __init arch_init_irq(void)
|
|
{
|
|
mips_cpu_irq_init(MIPS_CPU_IRQ_BASE);
|
|
}
|