161 lines
3.9 KiB
C
161 lines
3.9 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/gdb-stub.h>
|
|
|
|
static volatile int *lasat_int_status = NULL;
|
|
static volatile int *lasat_int_mask = NULL;
|
|
static volatile int lasat_int_mask_shift;
|
|
|
|
extern asmlinkage void lasatIRQ(void);
|
|
|
|
void disable_lasat_irq(unsigned int irq_nr)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
void enable_lasat_irq(unsigned int irq_nr)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
*lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static unsigned int startup_lasat_irq(unsigned int irq)
|
|
{
|
|
enable_lasat_irq(irq);
|
|
|
|
return 0; /* never anything pending */
|
|
}
|
|
|
|
#define shutdown_lasat_irq disable_lasat_irq
|
|
|
|
#define mask_and_ack_lasat_irq disable_lasat_irq
|
|
|
|
static void end_lasat_irq(unsigned int irq)
|
|
{
|
|
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
|
|
enable_lasat_irq(irq);
|
|
}
|
|
|
|
static struct hw_interrupt_type lasat_irq_type = {
|
|
"Lasat",
|
|
startup_lasat_irq,
|
|
shutdown_lasat_irq,
|
|
enable_lasat_irq,
|
|
disable_lasat_irq,
|
|
mask_and_ack_lasat_irq,
|
|
end_lasat_irq,
|
|
NULL
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
void lasat_hw0_irqdispatch(struct pt_regs *regs)
|
|
{
|
|
unsigned long int_status;
|
|
int irq;
|
|
|
|
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, regs);
|
|
}
|
|
}
|
|
|
|
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");
|
|
}
|
|
|
|
/* Now safe to set the exception vector. */
|
|
set_except_vector(0, lasatIRQ);
|
|
|
|
for (i = 0; i <= LASATINT_END; i++) {
|
|
irq_desc[i].status = IRQ_DISABLED;
|
|
irq_desc[i].action = 0;
|
|
irq_desc[i].depth = 1;
|
|
irq_desc[i].handler = &lasat_irq_type;
|
|
}
|
|
}
|