e77c232cfc
__do_IRQ() is needed only by irq handlers that can't use default handlers defined in kernel/irq/chip.c. For others platforms there's no need to compile this function since it won't be used. For those platforms this patch defines GENERIC_HARDIRQS_NO__DO_IRQ symbol which is used exactly for this purpose. Futhermore for platforms which do not use __do_IRQ(), end() method which is part of the 'irq_chip' structure is not used. This patch simply removes this method in this case. Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
131 lines
3.4 KiB
C
131 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/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/lasat/lasatint.h>
|
|
#include <asm/time.h>
|
|
#include <asm/gdb-stub.h>
|
|
|
|
static volatile int *lasat_int_status = NULL;
|
|
static volatile int *lasat_int_mask = NULL;
|
|
static volatile int lasat_int_mask_shift;
|
|
|
|
void disable_lasat_irq(unsigned int irq_nr)
|
|
{
|
|
*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
|
|
}
|
|
|
|
void enable_lasat_irq(unsigned int irq_nr)
|
|
{
|
|
*lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
|
|
}
|
|
|
|
static struct irq_chip lasat_irq_type = {
|
|
.typename = "Lasat",
|
|
.ack = disable_lasat_irq,
|
|
.mask = disable_lasat_irq,
|
|
.mask_ack = disable_lasat_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 */
|
|
ll_timer_interrupt(7);
|
|
return;
|
|
}
|
|
|
|
int_status = get_int_status();
|
|
|
|
/* if int_status == 0, then the interrupt has already been cleared */
|
|
if (int_status) {
|
|
irq = ls1bit32(int_status);
|
|
|
|
do_IRQ(irq);
|
|
}
|
|
}
|
|
|
|
void __init arch_init_irq(void)
|
|
{
|
|
int i;
|
|
|
|
switch (mips_machtype) {
|
|
case MACH_LASAT_100:
|
|
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;
|
|
break;
|
|
case MACH_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;
|
|
break;
|
|
default:
|
|
panic("arch_init_irq: mips_machtype incorrect");
|
|
}
|
|
|
|
for (i = 0; i <= LASATINT_END; i++)
|
|
set_irq_chip_and_handler(i, &lasat_irq_type, handle_level_irq);
|
|
}
|