// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology
 * Author: Fuxin Zhang, zhangfx@lemote.com
 */
#include <linux/delay.h>
#include <linux/interrupt.h>

#include <loongson.h>
/*
 * the first level int-handler will jump here if it is a bonito irq
 */
void bonito_irqdispatch(void)
{
        u32 int_status;
        int i;

        /* workaround the IO dma problem: let cpu looping to allow DMA finish */
        int_status = LOONGSON_INTISR;
        while (int_status & (1 << 10)) {
                udelay(1);
                int_status = LOONGSON_INTISR;
        }

        /* Get pending sources, masked by current enables */
        int_status = LOONGSON_INTISR & LOONGSON_INTEN;

        if (int_status) {
                i = __ffs(int_status);
                do_IRQ(LOONGSON_IRQ_BASE + i);
        }
}

asmlinkage void plat_irq_dispatch(void)
{
        unsigned int pending;

        pending = read_c0_cause() & read_c0_status() & ST0_IM;

        /* machine-specific plat_irq_dispatch */
        mach_irq_dispatch(pending);
}

void __init arch_init_irq(void)
{
        /*
         * Clear all of the interrupts while we change the able around a bit.
         * int-handler is not on bootstrap
         */
        clear_c0_status(ST0_IM | ST0_BEV);

        /* no steer */
        LOONGSON_INTSTEER = 0;

        /*
         * Mask out all interrupt by writing "1" to all bit position in
         * the interrupt reset reg.
         */
        LOONGSON_INTENCLR = ~0;

        /* machine specific irq init */
        mach_init_irq();
}