/*      $NetBSD: bus_space.c,v 1.25 2026/04/26 10:52:14 thorpej Exp $   */

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Implementation of bus_space mapping for the hp300.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bus_space.c,v 1.25 2026/04/26 10:52:14 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/vmem.h>

#include <machine/autoconf.h>
#include <machine/bus.h>

#include <uvm/uvm_extern.h>

int
bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
    bus_space_handle_t *bshp)
{
        vmem_addr_t kva;
        vsize_t offset;
        int error;

        if (t->bustype == HP300_BUS_SPACE_INTIO) {
                /*
                 * Intio space is direct-mapped in pmap_bootstrap(); just
                 * do the translation.
                 */
                *bshp = (bus_space_handle_t)IIOV(INTIOBASE + bpa);
                return 0;
        }

        if (t->bustype != HP300_BUS_SPACE_DIO &&
            t->bustype != HP300_BUS_SPACE_SGC)
                panic("%s: bad space tag", __func__);

        /*
         * Allocate virtual address space from the extio extent map.
         */
        offset = m68k_page_offset(bpa);
        size = m68k_round_page(offset + size);
        error = vmem_alloc(extio_arena, size, VM_BESTFIT | VM_NOSLEEP, &kva);
        if (error) {
                return error;
        }

        vaddr_t va = kva;
        vaddr_t eva = kva + size;
        bpa = m68k_trunc_page(bpa);
        while (va < eva) {
                pmap_kenter_pa(va, bpa, VM_PROT_READ | VM_PROT_WRITE,
                    PMAP_NOCACHE);
                va += PAGE_SIZE;
                bpa += PAGE_SIZE;
        }

        /*
         * All done.
         */
        *bshp = (bus_space_handle_t)(kva + offset);
        return 0;
}

int
bus_space_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend,
    bus_size_t size, bus_size_t alignment, bus_size_t boundary, int flags,
    bus_addr_t *bpap, bus_space_handle_t *bshp)
{

        /*
         * Not meaningful on any currently-supported hp300 bus.
         */
        return EINVAL;
}

void
bus_space_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
{

        /*
         * Not meaningful on any currently-supported hp300 bus.
         */
        panic("%s: shouldn't be here", __func__);
}

void
bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
{
        vaddr_t kva;
        vsize_t offset;

        if (t->bustype == HP300_BUS_SPACE_INTIO) {
                /*
                 * Intio space is direct-mapped in pmap_bootstrap(); nothing
                 * to do
                 */
                return;
        }

        if (t->bustype != HP300_BUS_SPACE_DIO &&
            t->bustype != HP300_BUS_SPACE_SGC)
                panic("%s: bad space tag", __func__);

        kva = m68k_trunc_page(bsh);
        offset = m68k_page_offset(bsh);
        size = m68k_round_page(offset + size);

        KASSERT(bsh >= (vaddr_t)extiobase);
        KASSERT(bsh < ((vaddr_t)extiobase + ptoa(EIOMAPSIZE)));

        /*
         * Unmap the range.
         */
        pmap_kremove(kva, size);

        /*
         * Free it from the extio arena.
         */
        vmem_free(extio_arena, kva, size);
}

int
bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
{

        *nbshp = bsh + offset;
        return 0;
}

int
hp300_bus_space_probe(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset, int sz)
{
        label_t faultbuf;
        int i;

        nofault = &faultbuf;
        if (setjmp(nofault)) {
                nofault = NULL;
                return 0;
        }

        switch (sz) {
        case 1:
                i = bus_space_read_1(t, bsh, offset);
                break;

        case 2:
                i = bus_space_read_2(t, bsh, offset);
                break;

        case 4:
                i = bus_space_read_4(t, bsh, offset);
                break;

        default:
                panic("%s: unupported data size %d", __func__, sz);
                /* NOTREACHED */
        }
        __USE(i);
        nofault = NULL;
        return 1;
}