// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2013 Altera Corporation
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* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
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*
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* based on irq.c from m68k which is:
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*
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* Copyright (C) 2007 Greg Ungerer <gerg@snapgear.com>
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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/of.h>
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static u32 ienable;
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asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
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{
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struct pt_regs *oldregs = set_irq_regs(regs);
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int irq;
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irq_enter();
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irq = irq_find_mapping(NULL, hwirq);
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generic_handle_irq(irq);
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irq_exit();
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set_irq_regs(oldregs);
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}
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static void chip_unmask(struct irq_data *d)
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{
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ienable |= (1 << d->hwirq);
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WRCTL(CTL_IENABLE, ienable);
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}
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static void chip_mask(struct irq_data *d)
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{
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ienable &= ~(1 << d->hwirq);
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WRCTL(CTL_IENABLE, ienable);
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}
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static struct irq_chip m_irq_chip = {
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.name = "NIOS2-INTC",
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.irq_unmask = chip_unmask,
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.irq_mask = chip_mask,
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};
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static int irq_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw_irq_num)
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{
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irq_set_chip_and_handler(virq, &m_irq_chip, handle_level_irq);
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return 0;
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}
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static const struct irq_domain_ops irq_ops = {
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.map = irq_map,
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.xlate = irq_domain_xlate_onecell,
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};
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void __init init_IRQ(void)
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{
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struct irq_domain *domain;
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struct device_node *node;
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node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.0");
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if (!node)
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node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.1");
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BUG_ON(!node);
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domain = irq_domain_add_linear(node, NIOS2_CPU_NR_IRQS, &irq_ops, NULL);
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BUG_ON(!domain);
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irq_set_default_host(domain);
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of_node_put(node);
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/* Load the initial ienable value */
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ienable = RDCTL(CTL_IENABLE);
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}
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