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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 <loongson.h>
/*
* the first level int-handler will jump here if it is a bonito irq
*/
void bonito_irqdispatch(void)
{
u32 int_status;
int i;
/* workaround the IO dma problem: let cpu looping to allow DMA finish */
int_status = LOONGSON_INTISR;
if (int_status & (1 << 10)) {
while (int_status & (1 << 10)) {
udelay(1);
int_status = LOONGSON_INTISR;
}
}
/* Get pending sources, masked by current enables */
int_status = LOONGSON_INTISR & LOONGSON_INTEN;
if (int_status != 0) {
i = __ffs(int_status);
int_status &= ~(1 << i);
do_IRQ(LOONGSON_IRQ_BASE + i);
}
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned int pending;
pending = read_c0_cause() & read_c0_status() & ST0_IM;
/* machine-specific plat_irq_dispatch */
mach_irq_dispatch(pending);
}
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);
/* setting irq trigger mode */
set_irq_trigger_mode();
/* no steer */
LOONGSON_INTSTEER = 0;
/*
* Mask out all interrupt by writing "1" to all bit position in
* the interrupt reset reg.
*/
LOONGSON_INTENCLR = ~0;
/* machine specific irq init */
mach_init_irq();
}
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