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