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// SPDX-License-Identifier: GPL-2.0-only
/*
* arch/arm/mach-iop32x/irq.c
*
* Generic IOP32X IRQ handling functionality
*
* Author: Rory Bolt <rorybolt@pacbell.net>
* Copyright (C) 2002 Rory Bolt
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <asm/mach/irq.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include "hardware.h"
static u32 iop32x_mask;
static void intctl_write(u32 val)
{
asm volatile("mcr p6, 0, %0, c0, c0, 0" : : "r" (val));
}
static void intstr_write(u32 val)
{
asm volatile("mcr p6, 0, %0, c4, c0, 0" : : "r" (val));
}
static u32 iintsrc_read(void)
{
int irq;
asm volatile("mrc p6, 0, %0, c8, c0, 0" : "=r" (irq));
return irq;
}
static void
iop32x_irq_mask(struct irq_data *d)
{
iop32x_mask &= ~(1 << (d->irq - 1));
intctl_write(iop32x_mask);
}
static void
iop32x_irq_unmask(struct irq_data *d)
{
iop32x_mask |= 1 << (d->irq - 1);
intctl_write(iop32x_mask);
}
struct irq_chip ext_chip = {
.name = "IOP32x",
.irq_ack = iop32x_irq_mask,
.irq_mask = iop32x_irq_mask,
.irq_unmask = iop32x_irq_unmask,
};
static void iop_handle_irq(struct pt_regs *regs)
{
u32 mask;
iop_enable_cp6();
do {
mask = iintsrc_read();
if (mask)
generic_handle_irq(fls(mask));
} while (mask);
}
void __init iop32x_init_irq(void)
{
int i;
iop_init_cp6_handler();
set_handle_irq(iop_handle_irq);
intctl_write(0);
intstr_write(0);
if (machine_is_glantank() ||
machine_is_iq80321() ||
machine_is_iq31244() ||
machine_is_n2100() ||
machine_is_em7210())
*IOP3XX_PCIIRSR = 0x0f;
for (i = 1; i < NR_IRQS; i++) {
irq_set_chip_and_handler(i, &ext_chip, handle_level_irq);
irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
}
}
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