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/*
* linux/arch/arm/mach-iop3xx/iop321-irq.c
*
* Generic IOP321 IRQ handling functionality
*
* Author: Rory Bolt <rorybolt@pacbell.net>
* Copyright (C) 2002 Rory Bolt
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Added IOP3XX chipset and IQ80321 board masking code.
*
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <asm/mach/irq.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
static u32 iop321_mask /* = 0 */;
static inline void intctl_write(u32 val)
{
asm volatile("mcr p6,0,%0,c0,c0,0"::"r" (val));
}
static inline void intstr_write(u32 val)
{
asm volatile("mcr p6,0,%0,c4,c0,0"::"r" (val));
}
static void
iop321_irq_mask (unsigned int irq)
{
iop321_mask &= ~(1 << (irq - IOP321_IRQ_OFS));
intctl_write(iop321_mask);
}
static void
iop321_irq_unmask (unsigned int irq)
{
iop321_mask |= (1 << (irq - IOP321_IRQ_OFS));
intctl_write(iop321_mask);
}
struct irqchip ext_chip = {
.ack = iop321_irq_mask,
.mask = iop321_irq_mask,
.unmask = iop321_irq_unmask,
};
void __init iop321_init_irq(void)
{
unsigned int i, tmp;
/* Enable access to coprocessor 6 for dealing with IRQs.
* From RMK:
* Basically, the Intel documentation here is poor. It appears that
* you need to set the bit to be able to access the coprocessor from
* SVC mode. Whether that allows access from user space or not is
* unclear.
*/
asm volatile (
"mrc p15, 0, %0, c15, c1, 0\n\t"
"orr %0, %0, %1\n\t"
"mcr p15, 0, %0, c15, c1, 0\n\t"
/* The action is delayed, so we have to do this: */
"mrc p15, 0, %0, c15, c1, 0\n\t"
"mov %0, %0\n\t"
"sub pc, pc, #4"
: "=r" (tmp) : "i" (1 << 6) );
intctl_write(0); // disable all interrupts
intstr_write(0); // treat all as IRQ
if(machine_is_iq80321() ||
machine_is_iq31244()) // all interrupts are inputs to chip
*IOP321_PCIIRSR = 0x0f;
for(i = IOP321_IRQ_OFS; i < NR_IOP321_IRQS; i++)
{
set_irq_chip(i, &ext_chip);
set_irq_handler(i, do_level_IRQ);
set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
}
}
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