mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 06:55:13 +08:00
5a4a4ad851
Mark interrupts with no_action handler, cascade interrupts, low level interrupts (bus error, halt ..) with IRQF_NO_THREAD to exclude them from forced threading. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mips@linux-mips.org Cc: Wu Zhangjin <wuzhangjin@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/*
|
|
* Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 1999,2000 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.
|
|
*
|
|
* Routines for generic manipulation of the interrupts found on the
|
|
* Lasat boards.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/irq_cpu.h>
|
|
#include <asm/lasat/lasat.h>
|
|
#include <asm/lasat/lasatint.h>
|
|
|
|
#include <irq.h>
|
|
|
|
static volatile int *lasat_int_status;
|
|
static volatile int *lasat_int_mask;
|
|
static volatile int lasat_int_mask_shift;
|
|
|
|
void disable_lasat_irq(struct irq_data *d)
|
|
{
|
|
unsigned int irq_nr = d->irq - LASAT_IRQ_BASE;
|
|
|
|
*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
|
|
}
|
|
|
|
void enable_lasat_irq(struct irq_data *d)
|
|
{
|
|
unsigned int irq_nr = d->irq - LASAT_IRQ_BASE;
|
|
|
|
*lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
|
|
}
|
|
|
|
static struct irq_chip lasat_irq_type = {
|
|
.name = "Lasat",
|
|
.irq_mask = disable_lasat_irq,
|
|
.irq_unmask = enable_lasat_irq,
|
|
};
|
|
|
|
static inline int ls1bit32(unsigned int x)
|
|
{
|
|
int b = 31, s;
|
|
|
|
s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
|
|
s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
|
|
s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
|
|
s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
|
|
s = 1; if (x << 1 == 0) s = 0; b -= s;
|
|
|
|
return b;
|
|
}
|
|
|
|
static unsigned long (*get_int_status)(void);
|
|
|
|
static unsigned long get_int_status_100(void)
|
|
{
|
|
return *lasat_int_status & *lasat_int_mask;
|
|
}
|
|
|
|
static unsigned long get_int_status_200(void)
|
|
{
|
|
unsigned long int_status;
|
|
|
|
int_status = *lasat_int_status;
|
|
int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
|
|
return int_status;
|
|
}
|
|
|
|
asmlinkage void plat_irq_dispatch(void)
|
|
{
|
|
unsigned long int_status;
|
|
unsigned int cause = read_c0_cause();
|
|
int irq;
|
|
|
|
if (cause & CAUSEF_IP7) { /* R4000 count / compare IRQ */
|
|
do_IRQ(7);
|
|
return;
|
|
}
|
|
|
|
int_status = get_int_status();
|
|
|
|
/* if int_status == 0, then the interrupt has already been cleared */
|
|
if (int_status) {
|
|
irq = LASAT_IRQ_BASE + ls1bit32(int_status);
|
|
|
|
do_IRQ(irq);
|
|
}
|
|
}
|
|
|
|
static struct irqaction cascade = {
|
|
.handler = no_action,
|
|
.name = "cascade",
|
|
.flags = IRQF_NO_THREAD,
|
|
};
|
|
|
|
void __init arch_init_irq(void)
|
|
{
|
|
int i;
|
|
|
|
if (IS_LASAT_200()) {
|
|
lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
|
|
lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
|
|
lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
|
|
get_int_status = get_int_status_200;
|
|
*lasat_int_mask &= 0xffff;
|
|
} else {
|
|
lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
|
|
lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
|
|
lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
|
|
get_int_status = get_int_status_100;
|
|
*lasat_int_mask = 0;
|
|
}
|
|
|
|
mips_cpu_irq_init();
|
|
|
|
for (i = LASAT_IRQ_BASE; i <= LASAT_IRQ_END; i++)
|
|
irq_set_chip_and_handler(i, &lasat_irq_type, handle_level_irq);
|
|
|
|
setup_irq(LASAT_CASCADE_IRQ, &cascade);
|
|
}
|