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* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 2002 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
* Sead board.
*
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <asm/mips-boards/sead.h>
#include <asm/mips-boards/seadint.h>
extern asmlinkage void mipsIRQ(void);
void disable_sead_irq(unsigned int irq_nr)
{
if (irq_nr == SEADINT_UART0)
clear_c0_status(0x00000400);
else
if (irq_nr == SEADINT_UART1)
clear_c0_status(0x00000800);
}
void enable_sead_irq(unsigned int irq_nr)
{
if (irq_nr == SEADINT_UART0)
set_c0_status(0x00000400);
else
if (irq_nr == SEADINT_UART1)
set_c0_status(0x00000800);
}
static unsigned int startup_sead_irq(unsigned int irq)
{
enable_sead_irq(irq);
return 0; /* never anything pending */
}
#define shutdown_sead_irq disable_sead_irq
#define mask_and_ack_sead_irq disable_sead_irq
static void end_sead_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_sead_irq(irq);
}
static struct hw_interrupt_type sead_irq_type = {
"SEAD",
startup_sead_irq,
shutdown_sead_irq,
enable_sead_irq,
disable_sead_irq,
mask_and_ack_sead_irq,
end_sead_irq,
NULL
};
void sead_hw0_irqdispatch(struct pt_regs *regs)
{
do_IRQ(0, regs);
}
void sead_hw1_irqdispatch(struct pt_regs *regs)
{
do_IRQ(1, regs);
}
void __init init_IRQ(void)
{
int i;
/*
* Mask out all interrupt
*/
clear_c0_status(0x0000ff00);
/* Now safe to set the exception vector. */
set_except_vector(0, mipsIRQ);
init_generic_irq();
for (i = 0; i < SEADINT_END; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = NULL;
irq_desc[i].depth = 1;
irq_desc[i].lock = SPIN_LOCK_UNLOCKED;
irq_desc[i].handler = &sead_irq_type;
}
}
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