/*      $NetBSD: sti_sgc.c,v 1.10 2025/05/28 17:33:38 tsutsui Exp $     */
/*      $OpenBSD: sti_sgc.c,v 1.14 2007/05/26 00:36:03 krw Exp $        */

/*
 * Copyright (c) 2005, Miodrag Vallat
 *
 * 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 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.
 *
 */
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sti_sgc.c,v 1.10 2025/05/28 17:33:38 tsutsui Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/bus.h>

#include <uvm/uvm_extern.h>

#include <hp300/dev/sgcvar.h>
#include <hp300/dev/sti_sgcvar.h>
#include <hp300/dev/sti_machdep.h>

static int sticonslot = -1;

static int sti_sgc_match(device_t, struct cfdata *, void *);
static void sti_sgc_attach(device_t, device_t, void *);

static int sti_sgc_probe(bus_space_tag_t, int);

CFATTACH_DECL_NEW(sti_sgc, sizeof(struct sti_machdep_softc),
    sti_sgc_match, sti_sgc_attach, NULL, NULL);

static int
sti_sgc_match(device_t parent, struct cfdata *cf, void *aux)
{
        struct sgc_attach_args *saa = aux;

        /*
         * If we already probed it successfully as a console device, go ahead,
         * since we will not be able to bus_space_map() again.
         */
        if (saa->saa_slot == sticonslot)
                return 1;

        return sti_sgc_probe(saa->saa_iot, saa->saa_slot);
}

static void
sti_sgc_attach(device_t parent, device_t self, void *aux)
{
        struct sti_machdep_softc *sc = device_private(self);
        struct sti_softc *ssc = &sc->sc_sti;
        struct sgc_attach_args *saa = aux;
        bus_space_tag_t bst;
        bus_space_handle_t romh;
        bus_addr_t base;
        u_int romend;
        int i;

        ssc->sc_dev = self;
        bst = saa->saa_iot;
        base = (bus_addr_t)sgc_slottopa(saa->saa_slot);
        sc->sc_base = base;

        if (saa->saa_slot == sticonslot) {
                sti_machdep_attach_console(sc);
        } else {
                if (bus_space_map(bst, base, PAGE_SIZE, 0, &romh)) {
                        aprint_error(": can't map ROM");
                        return;
                }
                /*
                 * Compute real PROM size
                 */
                romend = sti_rom_size(bst, romh);

                bus_space_unmap(bst, romh, PAGE_SIZE);

                if (bus_space_map(bst, base, romend, 0, &romh)) {
                        aprint_error(": can't map frame buffer");
                        return;
                }

                ssc->bases[0] = romh;
                for (i = 0; i < STI_REGION_MAX; i++)
                        ssc->bases[i] = base;

                if (sti_attach_common(ssc, bst, bst, romh,
                    STI_CODEBASE_M68K) != 0)
                        return;
        }

        sti_machdep_attach(sc);
}

static int
sti_sgc_probe(bus_space_tag_t iot, int slot)
{
        bus_space_handle_t ioh;
        int devtype;

        if (bus_space_map(iot, (bus_addr_t)sgc_slottopa(slot),
            PAGE_SIZE, 0, &ioh))
                return 0;

        devtype = bus_space_read_1(iot, ioh, 3);

        bus_space_unmap(iot, ioh, PAGE_SIZE);

        /*
         * This might not be reliable enough. On the other hand, non-STI
         * SGC cards will apparently not initialize in the hp300, to the
         * point of not even answering bus probes (checked with an
         * Harmony/FDDI SGC card).
         */
        if (devtype != STI_DEVTYPE1 && devtype != STI_DEVTYPE4)
                return 0;

        return 1;
}

int
sti_sgc_cnprobe(bus_space_tag_t bst, int slot)
{
        void *va;
        bus_space_handle_t romh;
        bus_addr_t base;
        int devtype, rv = 0;

        base = sgc_slottopa(slot);
        if (bus_space_map(bst, base, PAGE_SIZE, 0, &romh))
                return 0;

        va = bus_space_vaddr(bst, romh);
        if (badaddr(va))
                goto out;

        devtype = bus_space_read_1(bst, romh, 3);
        if (devtype == STI_DEVTYPE1 || devtype == STI_DEVTYPE4)
                rv = 1;

 out:
        bus_space_unmap(bst, romh, PAGE_SIZE);
        return rv;
}

void
sti_sgc_cnattach(bus_space_tag_t bst, int slot)
{
        paddr_t base;

        base = sgc_slottopa(slot);

        sti_machdep_cnattach(bst, base);

        sticonslot = slot;
}