142 lines
3.6 KiB
C
142 lines
3.6 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 MIPS
|
|
* Atlas board.
|
|
*
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
|
|
#include <asm/irq.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mips-boards/atlas.h>
|
|
#include <asm/mips-boards/atlasint.h>
|
|
#include <asm/gdb-stub.h>
|
|
|
|
|
|
static struct atlas_ictrl_regs *atlas_hw0_icregs;
|
|
|
|
extern asmlinkage void mipsIRQ(void);
|
|
|
|
#if 0
|
|
#define DEBUG_INT(x...) printk(x)
|
|
#else
|
|
#define DEBUG_INT(x...)
|
|
#endif
|
|
|
|
void disable_atlas_irq(unsigned int irq_nr)
|
|
{
|
|
atlas_hw0_icregs->intrsten = (1 << (irq_nr-ATLASINT_BASE));
|
|
iob();
|
|
}
|
|
|
|
void enable_atlas_irq(unsigned int irq_nr)
|
|
{
|
|
atlas_hw0_icregs->intseten = (1 << (irq_nr-ATLASINT_BASE));
|
|
iob();
|
|
}
|
|
|
|
static unsigned int startup_atlas_irq(unsigned int irq)
|
|
{
|
|
enable_atlas_irq(irq);
|
|
return 0; /* never anything pending */
|
|
}
|
|
|
|
#define shutdown_atlas_irq disable_atlas_irq
|
|
|
|
#define mask_and_ack_atlas_irq disable_atlas_irq
|
|
|
|
static void end_atlas_irq(unsigned int irq)
|
|
{
|
|
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
|
|
enable_atlas_irq(irq);
|
|
}
|
|
|
|
static struct hw_interrupt_type atlas_irq_type = {
|
|
.typename = "Atlas",
|
|
.startup = startup_atlas_irq,
|
|
.shutdown = shutdown_atlas_irq,
|
|
.enable = enable_atlas_irq,
|
|
.disable = disable_atlas_irq,
|
|
.ack = mask_and_ack_atlas_irq,
|
|
.end = end_atlas_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;
|
|
}
|
|
|
|
void atlas_hw0_irqdispatch(struct pt_regs *regs)
|
|
{
|
|
unsigned long int_status;
|
|
int irq;
|
|
|
|
int_status = atlas_hw0_icregs->intstatus;
|
|
|
|
/* if int_status == 0, then the interrupt has already been cleared */
|
|
if (unlikely(int_status == 0))
|
|
return;
|
|
|
|
irq = ATLASINT_BASE + ls1bit32(int_status);
|
|
|
|
DEBUG_INT("atlas_hw0_irqdispatch: irq=%d\n", irq);
|
|
|
|
do_IRQ(irq, regs);
|
|
}
|
|
|
|
void __init arch_init_irq(void)
|
|
{
|
|
int i;
|
|
|
|
atlas_hw0_icregs = (struct atlas_ictrl_regs *)ioremap (ATLAS_ICTRL_REGS_BASE, sizeof(struct atlas_ictrl_regs *));
|
|
|
|
/*
|
|
* Mask out all interrupt by writing "1" to all bit position in
|
|
* the interrupt reset reg.
|
|
*/
|
|
atlas_hw0_icregs->intrsten = 0xffffffff;
|
|
|
|
/* Now safe to set the exception vector. */
|
|
set_except_vector(0, mipsIRQ);
|
|
|
|
for (i = ATLASINT_BASE; i <= ATLASINT_END; i++) {
|
|
irq_desc[i].status = IRQ_DISABLED;
|
|
irq_desc[i].action = 0;
|
|
irq_desc[i].depth = 1;
|
|
irq_desc[i].handler = &atlas_irq_type;
|
|
spin_lock_init(&irq_desc[i].lock);
|
|
}
|
|
}
|