// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
 */

#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <asm/mach_desc.h>

#include <asm/irq_regs.h>
#include <asm/smp.h>

/*
 * Late Interrupt system init called from start_kernel for Boot CPU only
 *
 * Since slab must already be initialized, platforms can start doing any
 * needed request_irq( )s
 */
void __init init_IRQ(void)
{
        /*
         * process the entire interrupt tree in one go
         * Any external intc will be setup provided DT chains them
         * properly
         */
        irqchip_init();

#ifdef CONFIG_SMP
        /* a SMP H/w block could do IPI IRQ request here */
        if (plat_smp_ops.init_per_cpu)
                plat_smp_ops.init_per_cpu(smp_processor_id());
#endif

        if (machine_desc->init_per_cpu)
                machine_desc->init_per_cpu(smp_processor_id());
}

/*
 * "C" Entry point for any ARC ISR, called from low level vector handler
 * @irq is the vector number read from ICAUSE reg of on-chip intc
 */
void arch_do_IRQ(unsigned int hwirq, struct pt_regs *regs)
{
        struct pt_regs *old_regs;

        irq_enter();
        old_regs = set_irq_regs(regs);
        generic_handle_domain_irq(NULL, hwirq);
        set_irq_regs(old_regs);
        irq_exit();
}