mirror of https://gitee.com/openkylin/linux.git
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
/*
|
|
* Copyright (C) 1999, 2005 MIPS Technologies, Inc. All rights reserved.
|
|
*
|
|
* This program is free software; you can distribute it and/or modify it
|
|
* under the terms of the GNU General Public License (Version 2) as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <asm/mips-boards/simint.h>
|
|
#include <asm/irq_cpu.h>
|
|
|
|
static inline int clz(unsigned long x)
|
|
{
|
|
__asm__(
|
|
" .set push \n"
|
|
" .set mips32 \n"
|
|
" clz %0, %1 \n"
|
|
" .set pop \n"
|
|
: "=r" (x)
|
|
: "r" (x));
|
|
|
|
return x;
|
|
}
|
|
|
|
/*
|
|
* Version of ffs that only looks at bits 12..15.
|
|
*/
|
|
static inline unsigned int irq_ffs(unsigned int pending)
|
|
{
|
|
#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
|
|
return -clz(pending) + 31 - CAUSEB_IP;
|
|
#else
|
|
unsigned int a0 = 7;
|
|
unsigned int t0;
|
|
|
|
t0 = s0 & 0xf000;
|
|
t0 = t0 < 1;
|
|
t0 = t0 << 2;
|
|
a0 = a0 - t0;
|
|
s0 = s0 << t0;
|
|
|
|
t0 = s0 & 0xc000;
|
|
t0 = t0 < 1;
|
|
t0 = t0 << 1;
|
|
a0 = a0 - t0;
|
|
s0 = s0 << t0;
|
|
|
|
t0 = s0 & 0x8000;
|
|
t0 = t0 < 1;
|
|
/* t0 = t0 << 2; */
|
|
a0 = a0 - t0;
|
|
/* s0 = s0 << t0; */
|
|
|
|
return a0;
|
|
#endif
|
|
}
|
|
|
|
asmlinkage void plat_irq_dispatch(void)
|
|
{
|
|
unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
|
|
int irq;
|
|
|
|
irq = irq_ffs(pending);
|
|
|
|
if (irq > 0)
|
|
do_IRQ(MIPS_CPU_IRQ_BASE + irq);
|
|
else
|
|
spurious_interrupt();
|
|
}
|
|
|
|
void __init arch_init_irq(void)
|
|
{
|
|
mips_cpu_irq_init();
|
|
}
|