/*      $NetBSD: if_gem_sbus.c,v 1.15 2025/10/15 01:36:25 thorpej Exp $ */

/*-
 * Copyright (c) 2006 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Martin Husemann.
 *
 * 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.
 */

/*
 * SBus front-end for the GEM network driver
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_gem_sbus.c,v 1.15 2025/10/15 01:36:25 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/socket.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_ether.h>
#include <net/if_media.h>

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>

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

#include <dev/sbus/sbusvar.h>

#include <dev/ic/gemreg.h>
#include <dev/ic/gemvar.h>

struct gem_sbus_softc {
        struct  gem_softc       gsc_gem;        /* GEM device */
        void                    *gsc_ih;
        bus_space_handle_t      gsc_sbus_regs_h;
};

int     gemmatch_sbus(device_t, cfdata_t, void *);
void    gemattach_sbus(device_t, device_t, void *);

CFATTACH_DECL3_NEW(gem_sbus, sizeof(struct gem_sbus_softc),
    gemmatch_sbus, gemattach_sbus, NULL, NULL, NULL, NULL, 0);

int
gemmatch_sbus(device_t parent, cfdata_t cf, void *aux)
{
        struct sbus_attach_args *sa = aux;

        return (strcmp("network", sa->sa_name) == 0);
}

void
gemattach_sbus(device_t parent, device_t self, void *aux)
{
        struct sbus_attach_args *sa = aux;
        struct gem_sbus_softc *gsc = device_private(self);
        struct gem_softc *sc = &gsc->gsc_gem;
        uint8_t enaddr[ETHER_ADDR_LEN];

        sc->sc_dev = self;

        /* Pass on the bus tags */
        sc->sc_bustag = sa->sa_bustag;
        sc->sc_dmatag = sa->sa_dmatag;

        if (sa->sa_nreg < 2) {
                printf("%s: only %d register sets\n",
                        device_xname(self), sa->sa_nreg);
                return;
        }

        if (! ether_getaddr(self, enaddr)) {
                aprint_error(": unable to get MAC address\n");
                return;
        }

        /*
         * Map two register banks:
         *
         *      bank 0: status, config, reset
         *      bank 1: various gem parts
         *
         */
        if (sbus_bus_map(sa->sa_bustag,
                         sa->sa_reg[0].oa_space,
                         sa->sa_reg[0].oa_base,
                         (bus_size_t)sa->sa_reg[0].oa_size,
                         0, &sc->sc_h2) != 0) {
                aprint_error_dev(self, "cannot map registers\n");
                return;
        }
        if (sbus_bus_map(sa->sa_bustag,
                         sa->sa_reg[1].oa_space,
                         sa->sa_reg[1].oa_base,
                         (bus_size_t)sa->sa_reg[1].oa_size,
                         0, &sc->sc_h1) != 0) {
                aprint_error_dev(self, "cannot map registers\n");
                return;
        }

        if (!strcmp("serdes", prom_getpropstring(sa->sa_node, "shared-pins")))
                sc->sc_flags |= GEM_SERDES;
        sc->sc_variant = GEM_SUN_GEM;
        sc->sc_flags &= ~GEM_PCI;

        /*
         * SBUS config
         */
        (void) bus_space_read_4(sa->sa_bustag, sc->sc_h2, GEM_SBUS_RESET);
        delay(100);
        bus_space_write_4(sa->sa_bustag, sc->sc_h2, GEM_SBUS_CONFIG,
            GEM_SBUS_CFG_BSIZE128|GEM_SBUS_CFG_PARITY|GEM_SBUS_CFG_BMODE64);
        sc->sc_chiprev = bus_space_read_4(sa->sa_bustag, sc->sc_h2,
            GEM_SBUS_REVISION);

        printf(": GEM Ethernet controller (%s), version %s (rev 0x%02x)\n",
            sa->sa_name, prom_getpropstring(sa->sa_node, "version"),
            sc->sc_chiprev);

        gem_attach(sc, enaddr);

        /* Establish interrupt handler */
        if (sa->sa_nintr != 0)
                gsc->gsc_ih = bus_intr_establish(sa->sa_bustag, sa->sa_pri, IPL_NET,
                                        gem_intr, sc);
}