/*      $NetBSD: news4000.c,v 1.2 2024/06/02 13:28:44 andvar Exp $      */

/*-
 * Copyright (C) 2000 NONAKA Kimihiro.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define __INTR_PRIVATE
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/timetc.h>
#include <sys/intr.h>

#include <machine/adrsmap.h>
#include <machine/cpu.h>

#include <mips/locore.h>

#include <newsmips/apbus/apbusvar.h>
#include <newsmips/newsmips/machid.h>

static void news4000_level0_intr(void);
static void news4000_level1_intr(void);

static void news4000_enable_intr(void);
static void news4000_disable_intr(void);
static void news4000_enable_timer(void);
static void news4000_readidrom(uint8_t *);

/*
 * This is a mask of bits of to clear in the SR when we go to a
 * given interrupt priority level.
 */
static const struct ipl_sr_map news4000_ipl_sr_map = {
    .sr_bits = {
        [IPL_NONE] =            0,
        [IPL_SOFTCLOCK] =       MIPS_SOFT_INT_MASK_0,
        [IPL_SOFTNET] =         MIPS_SOFT_INT_MASK,
        [IPL_VM] =              MIPS_SOFT_INT_MASK
                                | MIPS_INT_MASK_0
                                | MIPS_INT_MASK_1,
        [IPL_SCHED] =           MIPS_SOFT_INT_MASK
                                | MIPS_INT_MASK_0
                                | MIPS_INT_MASK_1
                                | MIPS_INT_MASK_2,
        [IPL_DDB] =             MIPS_INT_MASK,
        [IPL_HIGH] =            MIPS_INT_MASK,
    },
};

/*
 * Handle news4000 interrupts.
 */
void
news4000_intr(int ppl, vaddr_t pc, uint32_t status)
{
        uint32_t ipending;
        int ipl;

        while (ppl < (ipl = splintr(&ipending))) {
                if (ipending & MIPS_INT_MASK_2) {
                        uint32_t int2stat;

                        int2stat = *(volatile uint32_t *)NEWS4000_INTST2;

                        if (int2stat & NEWS4000_INT2_TIMER) {
                                struct clockframe cf = {
                                        .pc = pc,
                                        .sr = status,
                                        .intr = (curcpu()->ci_idepth > 1),
                                };
                                *(volatile uint32_t *)NEWS4000_TIMER = 1;

                                hardclock(&cf);
                                intrcnt[HARDCLOCK_INTR]++;
                        }

                        apbus_wbflush();
                }

                if (ipending & MIPS_INT_MASK_5) {
                        uint32_t int5stat =
                            *(volatile uint32_t *)NEWS4000_INTST5;
                        printf("level5 interrupt: status = %04x\n", int5stat);
                        apbus_wbflush();
                }

                if (ipending & MIPS_INT_MASK_4) {
                        uint32_t int4stat =
                            *(volatile uint32_t *)NEWS4000_INTST4;
                        printf("level4 interrupt: status = %04x\n", int4stat);
                        apbus_wbflush();
                }

                if (ipending & MIPS_INT_MASK_3) {
                        printf("level3 interrupt\n");
                        apbus_wbflush();
                }

                if (ipending & MIPS_INT_MASK_1) {
                        news4000_level1_intr();
                        apbus_wbflush();
                }

                if (ipending & MIPS_INT_MASK_0) {
                        news4000_level0_intr();
                        apbus_wbflush();
                }
        }
}

static void
news4000_level1_intr(void)
{
        uint32_t int1stat;

        int1stat = *(volatile uint32_t *)NEWS4000_INTST1;

#if 0
        *(volatile uint32_t *)NEWS4000_LED = 0xe;       /* XXX */
#endif

        printf("level1_intr stat = 0x%x\n", int1stat);

        if (int1stat) {
                if (apbus_intr_dispatch(1, int1stat) == 0)
                        printf("level1_intr: no handler (mask 0x%04x)\n",
                            int1stat);
        } else
                printf("level1 stray interrupt?\n");
}

static void
news4000_level0_intr(void)
{
        uint32_t int0stat;

        int0stat = *(volatile uint32_t *)NEWS4000_INTST0;

        if (int0stat) {
                if (apbus_intr_dispatch(0, int0stat) == 0)
                        printf("level0_intr: no handler (mask 0x%04x)\n",
                            int0stat);
        } else
                printf("level0 stray interrupt?\n");
}

static void
news4000_enable_intr(void)
{

        *(volatile uint32_t *)NEWS4000_INTEN0 = 0xffffffff;
        *(volatile uint32_t *)NEWS4000_INTEN1 = 0xffffffff;
        *(volatile uint32_t *)NEWS4000_INTEN2 = 1;
        *(volatile uint32_t *)NEWS4000_INTEN3 = 0;
        *(volatile uint32_t *)NEWS4000_INTEN4 = 0;      /* 3 */
        *(volatile uint32_t *)NEWS4000_INTEN5 = 0;      /* 3 */
}

static void
news4000_disable_intr(void)
{

        *(volatile uint32_t *)NEWS4000_INTEN0 = 0;
        *(volatile uint32_t *)NEWS4000_INTEN1 = 0;
        *(volatile uint32_t *)NEWS4000_INTEN2 = 0;
        *(volatile uint32_t *)NEWS4000_INTEN3 = 0;
        *(volatile uint32_t *)NEWS4000_INTEN4 = 0;
        *(volatile uint32_t *)NEWS4000_INTEN5 = 0;
}

static void
news4000_enable_timer(void)
{

#if 0
        news4000_tc_init();
#endif

        /* enable timer interrupt */
        *(volatile uint32_t *)NEWS4000_TIMERCTL = 1;
}

extern struct idrom idrom;

static void
news4000_readidrom(uint8_t *rom)
{
        volatile uint32_t *status_port = (uint32_t *)NEWS4000_IDROM_STATUS;
        volatile uint32_t *data_port = (uint32_t *)NEWS4000_IDROM_DATA;
        int offset;

        while ((*status_port & 1) == 0)
                continue;

        for (offset = 0; offset < sizeof(struct idrom); offset++, rom++) {
                *data_port = offset;
                
                while ((*status_port & 1) == 0)
                        continue;

                *rom = (uint8_t)(*data_port & 0xff);
        }
}

void
news4000_init(void)
{

        ipl_sr_map = news4000_ipl_sr_map;

        enable_intr = news4000_enable_intr;
        disable_intr = news4000_disable_intr;
        enable_timer = news4000_enable_timer;

        news_wbflush = (uint32_t *)NEWS4000_WBFLUSH;

        news4000_readidrom((uint8_t *)&idrom);
        hostid = idrom.id_serial;
}