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/*
* Generic interrupt control functions for Broadcom MIPS boards
*
* Copyright 2004, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*
* $Id: irq.c,v 1.1 2005/03/16 13:50:00 wbx Exp $
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/gdb-stub.h>
#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
extern asmlinkage void brcmIRQ(void);
extern asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs);
void
brcm_irq_dispatch(struct pt_regs *regs)
{
u32 cause;
cause = read_c0_cause() &
read_c0_status() &
CAUSEF_IP;
#ifdef CONFIG_KERNPROF
change_c0_status(cause | 1, 1);
#else
clear_c0_status(cause);
#endif
if (cause & CAUSEF_IP7)
do_IRQ(7, regs);
if (cause & CAUSEF_IP2)
do_IRQ(2, regs);
if (cause & CAUSEF_IP3)
do_IRQ(3, regs);
if (cause & CAUSEF_IP4)
do_IRQ(4, regs);
if (cause & CAUSEF_IP5)
do_IRQ(5, regs);
if (cause & CAUSEF_IP6)
do_IRQ(6, regs);
}
static void
enable_brcm_irq(unsigned int irq)
{
if (irq < 8)
set_c0_status(1 << (irq + 8));
else
set_c0_status(IE_IRQ0);
}
static void
disable_brcm_irq(unsigned int irq)
{
if (irq < 8)
clear_c0_status(1 << (irq + 8));
else
clear_c0_status(IE_IRQ0);
}
static void
ack_brcm_irq(unsigned int irq)
{
/* Already done in brcm_irq_dispatch */
}
static unsigned int
startup_brcm_irq(unsigned int irq)
{
enable_brcm_irq(irq);
return 0; /* never anything pending */
}
static void
end_brcm_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_brcm_irq(irq);
}
static struct hw_interrupt_type brcm_irq_type = {
typename: "MIPS",
startup: startup_brcm_irq,
shutdown: disable_brcm_irq,
enable: enable_brcm_irq,
disable: disable_brcm_irq,
ack: ack_brcm_irq,
end: end_brcm_irq,
NULL
};
void __init
init_IRQ(void)
{
int i;
for (i = 0; i < NR_IRQS; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = 0;
irq_desc[i].depth = 1;
irq_desc[i].handler = &brcm_irq_type;
}
set_except_vector(0, brcmIRQ);
change_c0_status(ST0_IM, ALLINTS);
#ifdef CONFIG_REMOTE_DEBUG
printk("Breaking into debugger...\n");
set_debug_traps();
breakpoint();
#endif
}
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