/*      $NetBSD: if_le_lebuffer.c,v 1.31 2025/10/15 01:36:25 thorpej Exp $      */

/*-
 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum; Jason R. Thorpe of the Numerical Aerospace
 * Simulation Facility, NASA Ames Research Center; Paul Kranenburg.
 *
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_le_lebuffer.c,v 1.31 2025/10/15 01:36:25 thorpej Exp $");

#include "opt_inet.h"

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

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

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#endif

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

#include <dev/sbus/sbusvar.h>
#include <dev/sbus/lebuffervar.h>

#include <dev/ic/lancereg.h>
#include <dev/ic/lancevar.h>
#include <dev/ic/am7990reg.h>
#include <dev/ic/am7990var.h>

#include "ioconf.h"

/*
 * LANCE registers.
 */
#define LEREG1_RDP      0       /* Register Data port */
#define LEREG1_RAP      2       /* Register Address port */

struct  le_softc {
        struct  am7990_softc    sc_am7990;      /* glue to MI code */
        bus_space_tag_t         sc_bustag;
        bus_dma_tag_t           sc_dmatag;
        bus_space_handle_t      sc_reg;         /* LANCE registers */
};


int     lematch_lebuffer(device_t, cfdata_t, void *);
void    leattach_lebuffer(device_t, device_t, void *);

/*
 * Media types supported.
 */
static int lemedia[] = {
        IFM_ETHER | IFM_10_T,
};
#define NLEMEDIA        __arraycount(lemedia)

CFATTACH_DECL_NEW(le_lebuffer, sizeof(struct le_softc),
    lematch_lebuffer, leattach_lebuffer, NULL, NULL);

#if defined(_KERNEL_OPT)
#include "opt_ddb.h"
#endif

static void lewrcsr(struct lance_softc *, uint16_t, uint16_t);
static uint16_t lerdcsr(struct lance_softc *, uint16_t);

static void
lewrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
{
        struct le_softc *lesc = (struct le_softc *)sc;
        bus_space_tag_t t = lesc->sc_bustag;
        bus_space_handle_t h = lesc->sc_reg;

        bus_space_write_2(t, h, LEREG1_RAP, port);
        bus_space_write_2(t, h, LEREG1_RDP, val);

#if defined(SUN4M)
        /*
         * We need to flush the Sbus->Mbus write buffers. This can most
         * easily be accomplished by reading back the register that we
         * just wrote (thanks to Chris Torek for this solution).
         */
        (void)bus_space_read_2(t, h, LEREG1_RDP);
#endif
}

static uint16_t
lerdcsr(struct lance_softc *sc, uint16_t port)
{
        struct le_softc *lesc = (struct le_softc *)sc;
        bus_space_tag_t t = lesc->sc_bustag;
        bus_space_handle_t h = lesc->sc_reg;

        bus_space_write_2(t, h, LEREG1_RAP, port);
        return (bus_space_read_2(t, h, LEREG1_RDP));
}

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

        return (strcmp(cf->cf_name, sa->sa_name) == 0);
}


void
leattach_lebuffer(device_t parent, device_t self, void *aux)
{
        struct le_softc *lesc = device_private(self);
        struct lance_softc *sc = &lesc->sc_am7990.lsc;
        struct lebuf_softc *lebuf = device_private(parent);
        struct sbus_attach_args *sa = aux;

        sc->sc_dev = self;
        lesc->sc_bustag = sa->sa_bustag;
        lesc->sc_dmatag = sa->sa_dmatag;

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

        if (sbus_bus_map(sa->sa_bustag,
                         sa->sa_slot,
                         sa->sa_offset,
                         sa->sa_size,
                         0, &lesc->sc_reg)) {
                aprint_error(": cannot map registers\n");
                return;
        }

        sc->sc_mem = lebuf->sc_buffer;
        sc->sc_memsize = lebuf->sc_bufsiz;
        sc->sc_addr = 0; /* Lance view is offset by buffer location */
        lebuf->attached = 1;

        /* That old black magic... */
        sc->sc_conf3 = prom_getpropint(sa->sa_node, "busmaster-regval",
                                  LE_C3_BSWP | LE_C3_ACON | LE_C3_BCON);

        sc->sc_supmedia = lemedia;
        sc->sc_nsupmedia = NLEMEDIA;
        sc->sc_defaultmedia = lemedia[0];

        sc->sc_copytodesc = lance_copytobuf_contig;
        sc->sc_copyfromdesc = lance_copyfrombuf_contig;
        sc->sc_copytobuf = lance_copytobuf_contig;
        sc->sc_copyfrombuf = lance_copyfrombuf_contig;
        sc->sc_zerobuf = lance_zerobuf_contig;

        sc->sc_rdcsr = lerdcsr;
        sc->sc_wrcsr = lewrcsr;

        am7990_config(&lesc->sc_am7990);

        /* Establish interrupt handler */
        if (sa->sa_nintr != 0)
                (void)bus_intr_establish(lesc->sc_bustag, sa->sa_pri,
                                         IPL_NET, am7990_intr, sc);
}