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/*
* linux/arch/arm/mach-iop3xx/iop331-irq.c
*
* Generic IOP331 IRQ handling functionality
*
* Author: Dave Jiang <dave.jiang@intel.com>
* Copyright (C) 2003 Intel Corp.
*
* 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.
*
*
*/
#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 iop331_mask0 = 0;
static u32 iop331_mask1 = 0;
static inline void intctl_write0(u32 val)
{
// INTCTL0
asm volatile("mcr p6,0,%0,c0,c0,0"::"r" (val));
}
static inline void intctl_write1(u32 val)
{
// INTCTL1
asm volatile("mcr p6,0,%0,c1,c0,0"::"r" (val));
}
static inline void intstr_write0(u32 val)
{
// INTSTR0
asm volatile("mcr p6,0,%0,c2,c0,0"::"r" (val));
}
static inline void intstr_write1(u32 val)
{
// INTSTR1
asm volatile("mcr p6,0,%0,c3,c0,0"::"r" (val));
}
static void
iop331_irq_mask1 (unsigned int irq)
{
iop331_mask0 &= ~(1 << (irq - IOP331_IRQ_OFS));
intctl_write0(iop331_mask0);
}
static void
iop331_irq_mask2 (unsigned int irq)
{
iop331_mask1 &= ~(1 << (irq - IOP331_IRQ_OFS - 32));
intctl_write1(iop331_mask1);
}
static void
iop331_irq_unmask1(unsigned int irq)
{
iop331_mask0 |= (1 << (irq - IOP331_IRQ_OFS));
intctl_write0(iop331_mask0);
}
static void
iop331_irq_unmask2(unsigned int irq)
{
iop331_mask1 |= (1 << (irq - IOP331_IRQ_OFS - 32));
intctl_write1(iop331_mask1);
}
struct irqchip iop331_irqchip1 = {
.ack = iop331_irq_mask1,
.mask = iop331_irq_mask1,
.unmask = iop331_irq_unmask1,
};
struct irqchip iop331_irqchip2 = {
.ack = iop331_irq_mask2,
.mask = iop331_irq_mask2,
.unmask = iop331_irq_unmask2,
};
void __init iop331_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_write0(0); // disable all interrupts
intctl_write1(0);
intstr_write0(0); // treat all as IRQ
intstr_write1(0);
if(machine_is_iq80331()) // all interrupts are inputs to chip
*IOP331_PCIIRSR = 0x0f;
for(i = IOP331_IRQ_OFS; i < NR_IOP331_IRQS; i++)
{
set_irq_chip(i, (i < 32) ? &iop331_irqchip1 : &iop331_irqchip2);
set_irq_handler(i, do_level_IRQ);
set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
}
}
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