131 lines
2.5 KiB
C
131 lines
2.5 KiB
C
|
/*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* $Id$
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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
|
||
|
|
}
|