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/*
* Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
* Author: Fuxin Zhang, zhangfx@lemote.com
*
* 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.
*/
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <asm/irq_cpu.h>
#include <asm/i8259.h>
#include <loongson.h>
/*
* the first level int-handler will jump here if it is a bonito irq
*/
static void bonito_irqdispatch(void)
{
u32 int_status;
int i;
/* workaround the IO dma problem: let cpu looping to allow DMA finish */
int_status = BONITO_INTISR;
if (int_status & (1 << 10)) {
while (int_status & (1 << 10)) {
udelay(1);
int_status = BONITO_INTISR;
}
}
/* Get pending sources, masked by current enables */
int_status = BONITO_INTISR & BONITO_INTEN;
if (int_status != 0) {
i = __ffs(int_status);
int_status &= ~(1 << i);
do_IRQ(BONITO_IRQ_BASE + i);
}
}
static void i8259_irqdispatch(void)
{
int irq;
irq = i8259_irq();
if (irq >= 0)
do_IRQ(irq);
else
spurious_interrupt();
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
if (pending & CAUSEF_IP7)
do_IRQ(MIPS_CPU_IRQ_BASE + 7);
else if (pending & CAUSEF_IP6) /* perf counter loverflow */
do_IRQ(LOONGSON2_PERFCNT_IRQ);
else if (pending & CAUSEF_IP5)
i8259_irqdispatch();
else if (pending & CAUSEF_IP2)
bonito_irqdispatch();
else
spurious_interrupt();
}
static struct irqaction cascade_irqaction = {
.handler = no_action,
.name = "cascade",
};
void __init arch_init_irq(void)
{
/*
* Clear all of the interrupts while we change the able around a bit.
* int-handler is not on bootstrap
*/
clear_c0_status(ST0_IM | ST0_BEV);
local_irq_disable();
/* most bonito irq should be level triggered */
BONITO_INTEDGE = BONITO_ICU_SYSTEMERR | BONITO_ICU_MASTERERR |
BONITO_ICU_RETRYERR | BONITO_ICU_MBOXES;
BONITO_INTSTEER = 0;
/*
* Mask out all interrupt by writing "1" to all bit position in
* the interrupt reset reg.
*/
BONITO_INTENCLR = ~0;
/* init all controller
* 0-15 ------> i8259 interrupt
* 16-23 ------> mips cpu interrupt
* 32-63 ------> bonito irq
*/
/* Sets the first-level interrupt dispatcher. */
mips_cpu_irq_init();
init_i8259_irqs();
bonito_irq_init();
/* bonito irq at IP2 */
setup_irq(MIPS_CPU_IRQ_BASE + 2, &cascade_irqaction);
/* 8259 irq at IP5 */
setup_irq(MIPS_CPU_IRQ_BASE + 5, &cascade_irqaction);
}
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