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[netbsd-mini2440.git] / sys / arch / atari / vme / if_le_vme.c

/*      $NetBSD: if_le_vme.c,v 1.26 2009/07/08 12:23:10 tsutsui Exp $   */

/*-
 * Copyright (c) 1998 maximum entropy.  All rights reserved.
 * Copyright (c) 1997 Leo Weppelman.  All rights reserved.
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell and Rick Macklem.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)if_le.c     8.2 (Berkeley) 11/16/93
 */

/*-
 * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell and Rick Macklem.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)if_le.c     8.2 (Berkeley) 11/16/93
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_le_vme.c,v 1.26 2009/07/08 12:23:10 tsutsui Exp $");

#include "opt_inet.h"
#include "bpfilter.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_media.h>
#include <net/if_ether.h>

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

#include <machine/cpu.h>
#include <machine/bus.h>
#include <machine/iomap.h>
#include <machine/scu.h>
#include <machine/intr.h>

#include <atari/atari/device.h>

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

#include <atari/vme/vmevar.h>
#include <atari/vme/if_levar.h>

/*
 * All cards except BVME410 have 64KB RAM. However.... On the Riebl cards the
 * area between the offsets 0xee70-0xeec0 is used to store config data.
 */
struct le_addresses {
        u_long  reg_addr;
        u_long  mem_addr;
        int     irq;
        int     reg_size;
        int     mem_size;
        int     type_hint;
} lestd[] = {
        { 0xfe00fff0, 0xfe010000, IRQUNK, 16, 64*1024,
                                LE_OLD_RIEBL|LE_NEW_RIEBL }, /* Riebl   */
        { 0xffcffff0, 0xffcf0000,      5, 16, 64*1024,
                                LE_PAM },                    /* PAM     */
        { 0xfecffff0, 0xfecf0000,      5, 16, 64*1024,
                                LE_ROTHRON },                /* Rhotron */
        { 0xfeff4100, 0xfe000000,      4,  8, VMECF_MEMSIZ_DEFAULT,
                                LE_BVME410 }                 /* BVME410 */
};

#define NLESTD  __arraycount(lestd)

/*
 * Default mac for RIEBL cards without a (working) battery. The first 4 bytes
 * are the manufacturer id.
 */
static u_char riebl_def_mac[] = {
        0x00, 0x00, 0x36, 0x04, 0x00, 0x00
};

static int le_intr(struct le_softc *, int);
static void lepseudointr(struct le_softc *, void *);
static int le_vme_match(device_t, cfdata_t, void *);
static void le_vme_attach(device_t, device_t, void *);
static int probe_addresses(bus_space_tag_t *, bus_space_tag_t *,
                           bus_space_handle_t *, bus_space_handle_t *);
static void riebl_skip_reserved_area(struct lance_softc *);
static int nm93c06_read(bus_space_tag_t, bus_space_handle_t, int);
static int bvme410_probe(bus_space_tag_t, bus_space_handle_t);
static int bvme410_mem_size(bus_space_tag_t, u_long);
static void bvme410_copytobuf(struct lance_softc *, void *, int, int);
static void bvme410_zerobuf(struct lance_softc *, int, int);

CFATTACH_DECL_NEW(le_vme, sizeof(struct le_softc),
    le_vme_match, le_vme_attach, NULL, NULL);

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

#ifdef DDB
#define integrate
#define hide
#else
#define integrate       static inline
#define hide            static
#endif

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

hide void
lewrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
{
        struct le_softc         *lesc = (struct le_softc *)sc;
        int                     s;

        s = splhigh();
        bus_space_write_2(lesc->sc_iot, lesc->sc_ioh, LER_RAP, port);
        bus_space_write_2(lesc->sc_iot, lesc->sc_ioh, LER_RDP, val);
        splx(s);
}

hide uint16_t
lerdcsr(struct lance_softc *sc, uint16_t port)
{
        struct le_softc         *lesc = (struct le_softc *)sc;
        uint16_t                val;
        int                     s;

        s = splhigh();
        bus_space_write_2(lesc->sc_iot, lesc->sc_ioh, LER_RAP, port);
        val = bus_space_read_2(lesc->sc_iot, lesc->sc_ioh, LER_RDP); 
        splx(s);

        return (val);
}

static int
le_vme_match(device_t parent, cfdata_t cfp, void *aux)
{
        struct vme_attach_args  *va = aux;
        int                     i;
        bus_space_tag_t         iot;
        bus_space_tag_t         memt;
        bus_space_handle_t      ioh;
        bus_space_handle_t      memh;

        iot  = va->va_iot;
        memt = va->va_memt;

        for (i = 0; i < NLESTD; i++) {
                struct le_addresses     *le_ap = &lestd[i];
                int                     found  = 0;

                if ((va->va_iobase != IOBASEUNK)
                     && (va->va_iobase != le_ap->reg_addr))
                        continue;

                if ((va->va_maddr != MADDRUNK)
                     && (va->va_maddr != le_ap->mem_addr))
                        continue;

                if ((le_ap->irq != IRQUNK) && (va->va_irq != le_ap->irq))
                        continue;

                if (bus_space_map(iot, le_ap->reg_addr, le_ap->reg_size, 0, &ioh)) {
                        aprint_error("leprobe: cannot map io-area\n");
                        return (0);
                }
                if (le_ap->mem_size == VMECF_MEMSIZ_DEFAULT) {
                        if (bvme410_probe(iot, ioh)) {
                                bus_space_write_2(iot, ioh, BVME410_BAR, 0x1); /* XXX */
                                le_ap->mem_size = bvme410_mem_size(memt, le_ap->mem_addr);
                        }
                }
                if (le_ap->mem_size == VMECF_MEMSIZ_DEFAULT) {
                        bus_space_unmap(iot, ioh, le_ap->reg_size);
                        continue;
                }

                if (bus_space_map(memt, le_ap->mem_addr, le_ap->mem_size, 0, &memh)) {
                        bus_space_unmap(iot, ioh, le_ap->reg_size);
                        aprint_error("leprobe: cannot map memory-area\n");
                        return (0);
                }
                found = probe_addresses(&iot, &memt, &ioh, &memh);
                bus_space_unmap(iot, ioh, le_ap->reg_size);
                bus_space_unmap(memt, memh, le_ap->mem_size);

                if (found) {
                        va->va_iobase = le_ap->reg_addr;
                        va->va_iosize = le_ap->reg_size;
                        va->va_maddr  = le_ap->mem_addr;
                        va->va_msize  = le_ap->mem_size;
                        va->va_aux    = le_ap;
                        if (va->va_irq == IRQUNK)
                                va->va_irq = le_ap->irq;
                        return 1;
                }
    }
    return (0);
}

static int
probe_addresses(bus_space_tag_t *iot, bus_space_tag_t *memt,
    bus_space_handle_t *ioh, bus_space_handle_t *memh)
{

        /*
         * Test accesibility of register and memory area
         */
        if (!bus_space_peek_2(*iot, *ioh, LER_RDP))
                return 0;
        if (!bus_space_peek_1(*memt, *memh, 0))
                return 0;

        /*
         * Test for writable memory
         */
        bus_space_write_2(*memt, *memh, 0, 0xa5a5);
        if (bus_space_read_2(*memt, *memh, 0) != 0xa5a5)
                return 0;

        /*
         * Test writability of selector port.
         */
        bus_space_write_2(*iot, *ioh, LER_RAP, LE_CSR1);
        if (bus_space_read_2(*iot, *ioh, LER_RAP) != LE_CSR1)
                return 0;

        /*
         * Do a small register test
         */
        bus_space_write_2(*iot, *ioh, LER_RAP, LE_CSR0);
        bus_space_write_2(*iot, *ioh, LER_RDP, LE_C0_INIT | LE_C0_STOP);
        if (bus_space_read_2(*iot, *ioh, LER_RDP) != LE_C0_STOP)
                return 0;

        bus_space_write_2(*iot, *ioh, LER_RDP, LE_C0_STOP);
        if (bus_space_read_2(*iot, *ioh, LER_RDP) != LE_C0_STOP)
                return 0;

        return 1;
}

/*
 * Interrupt mess. Because the card's interrupt is hardwired to either
 * ipl5 or ipl3 (mostly on ipl5) and raising splnet to spl5() just won't do
 * (it kills the serial at the least), we use a 2-level interrupt scheme. The
 * card interrupt is routed to 'le_intr'. If the previous ipl was below
 * splnet, just call the mi-function. If not, save the interrupt status,
 * turn off card interrupts (the card is *very* persistent) and arrange
 * for a softint 'callback' through 'lepseudointr'.
 */
static int
le_intr(struct le_softc *lesc, int sr)
{
        struct lance_softc      *sc = &lesc->sc_am7990.lsc;
        uint16_t                csr0;

        if ((sr & PSL_IPL) < (ipl2psl_table[IPL_NET] & PSL_IPL))
                am7990_intr(sc);
        else {
                sc->sc_saved_csr0 = csr0 = lerdcsr(sc, LE_CSR0);
                lewrcsr(sc, LE_CSR0, csr0 & ~LE_C0_INEA);
                add_sicallback((si_farg)lepseudointr, lesc, sc);
        }
        return 1;
}


static void
lepseudointr(struct le_softc *lesc, void *sc)
{
        int     s;

        s = splx(lesc->sc_splval);
        am7990_intr(sc);
        splx(s);
}

static void
le_vme_attach(device_t parent, device_t self, void *aux)
{
        struct le_softc         *lesc = device_private(self);
        struct lance_softc      *sc = &lesc->sc_am7990.lsc;
        struct vme_attach_args  *va = aux;
        bus_space_handle_t      ioh;
        bus_space_handle_t      memh;
        struct le_addresses     *le_ap;
        int                     i;

        sc->sc_dev = self;
        aprint_normal("\n%s: ", device_xname(self));

        if (bus_space_map(va->va_iot, va->va_iobase, va->va_iosize, 0, &ioh))
                panic("leattach: cannot map io-area");
        if (bus_space_map(va->va_memt, va->va_maddr, va->va_msize, 0, &memh))
                panic("leattach: cannot map mem-area");

        lesc->sc_iot    = va->va_iot;
        lesc->sc_ioh    = ioh;
        lesc->sc_memt   = va->va_memt;
        lesc->sc_memh   = memh;
        lesc->sc_splval = (va->va_irq << 8) | PSL_S; /* XXX */
        le_ap           = (struct le_addresses *)va->va_aux;

        /*
         * Go on to find board type
         */
        if ((le_ap->type_hint & LE_PAM)
                && bus_space_peek_1(va->va_iot, ioh, LER_EEPROM)) {
                aprint_normal("PAM card");
                lesc->sc_type = LE_PAM;
                bus_space_read_1(va->va_iot, ioh, LER_MEME);
        }
        else if((le_ap->type_hint & LE_BVME410)
                && bvme410_probe(va->va_iot, ioh)) {
                aprint_normal("BVME410");
                lesc->sc_type = LE_BVME410;
        }
        else if (le_ap->type_hint & (LE_NEW_RIEBL|LE_OLD_RIEBL)) {
                aprint_normal("Riebl card");
                if(bus_space_read_4(va->va_memt, memh, RIEBL_MAGIC_ADDR)
                                                                == RIEBL_MAGIC)
                        lesc->sc_type = LE_NEW_RIEBL;
                else {
                        aprint_normal("(without battery) ");
                        lesc->sc_type = LE_OLD_RIEBL;
                }
        }
        else
                aprint_error("le_vme_attach: Unsupported card!");

        switch (lesc->sc_type) {
            case LE_BVME410:
                sc->sc_copytodesc   = bvme410_copytobuf;
                sc->sc_copyfromdesc = lance_copyfrombuf_contig;
                sc->sc_copytobuf    = bvme410_copytobuf;
                sc->sc_copyfrombuf  = lance_copyfrombuf_contig;
                sc->sc_zerobuf      = bvme410_zerobuf;
                break;
            default:
                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;
                break;
        }

        sc->sc_rdcsr   = lerdcsr;
        sc->sc_wrcsr   = lewrcsr;
        sc->sc_hwinit  = NULL;
        sc->sc_conf3   = LE_C3_BSWP;
        sc->sc_addr    = 0;
        sc->sc_memsize = va->va_msize;
        sc->sc_mem     = (void *)memh; /* XXX */

        /*
         * Get MAC address
         */
        switch (lesc->sc_type) {
            case LE_OLD_RIEBL:
                memcpy(sc->sc_enaddr, riebl_def_mac,
                                        sizeof(sc->sc_enaddr));
                break;
            case LE_NEW_RIEBL:
                for (i = 0; i < sizeof(sc->sc_enaddr); i++)
                    sc->sc_enaddr[i] =
                        bus_space_read_1(va->va_memt, memh, i + RIEBL_MAC_ADDR);
                        break;
            case LE_PAM:
                i = bus_space_read_1(va->va_iot, ioh, LER_EEPROM);
                for (i = 0; i < sizeof(sc->sc_enaddr); i++) {
                    sc->sc_enaddr[i] =
                        (bus_space_read_2(va->va_memt, memh, 2 * i) << 4) |
                        (bus_space_read_2(va->va_memt, memh, 2 * i + 1) & 0xf);
                }
                i = bus_space_read_1(va->va_iot, ioh, LER_MEME);
                break;
            case LE_BVME410:
                for (i = 0; i < (sizeof(sc->sc_enaddr) >> 1); i++) {
                    uint16_t tmp;

                    tmp = nm93c06_read(va->va_iot, ioh, i);
                    sc->sc_enaddr[2 * i] = (tmp >> 8) & 0xff;
                    sc->sc_enaddr[2 * i + 1] = tmp & 0xff;
                }
                bus_space_write_2(va->va_iot, ioh, BVME410_BAR, 0x1); /* XXX */
        }

        am7990_config(&lesc->sc_am7990);

        if ((lesc->sc_type == LE_OLD_RIEBL) || (lesc->sc_type == LE_NEW_RIEBL))
                riebl_skip_reserved_area(sc);

        /*
         * XXX: We always use uservector 64....
         */
        if ((lesc->sc_intr = intr_establish(64, USER_VEC, 0, 
                                (hw_ifun_t)le_intr, lesc)) == NULL) {
                aprint_error("le_vme_attach: Can't establish interrupt\n");
                return;
        }

        /*
         * Notify the card of the vector
         */
        switch (lesc->sc_type) {
                case LE_OLD_RIEBL:
                case LE_NEW_RIEBL:
                        bus_space_write_2(va->va_memt, memh, RIEBL_IVEC_ADDR,
                                                                64 + 64);
                        break;
                case LE_PAM:
                        bus_space_write_1(va->va_iot, ioh, LER_IVEC, 64 + 64);
                        break;
                case LE_BVME410:
                        bus_space_write_2(va->va_iot, ioh, BVME410_IVEC, 64 + 64);
                        break;
        }

        /*
         * Unmask the VME-interrupt we're on
         */
        if (machineid & ATARI_TT)
                SCU->vme_mask |= 1 << va->va_irq;
}

/*
 * True if 'addr' containe within [start,len]
 */
#define WITHIN(start, len, addr)        \
                ((addr >= start) && ((addr) <= ((start) + (len))))
static void
riebl_skip_reserved_area(struct lance_softc *sc)
{
        int     offset = 0;
        int     i;

        for(i = 0; i < sc->sc_nrbuf; i++) {
                if (WITHIN(sc->sc_rbufaddr[i], LEBLEN, RIEBL_RES_START)
                    || WITHIN(sc->sc_rbufaddr[i], LEBLEN, RIEBL_RES_END)) {
                        offset = RIEBL_RES_END - sc->sc_rbufaddr[i];
                }
                sc->sc_rbufaddr[i] += offset;
        }

        for(i = 0; i < sc->sc_ntbuf; i++) {
                if (WITHIN(sc->sc_tbufaddr[i], LEBLEN, RIEBL_RES_START)
                    || WITHIN(sc->sc_tbufaddr[i], LEBLEN, RIEBL_RES_END)) {
                        offset = RIEBL_RES_END - sc->sc_tbufaddr[i];
                }
                sc->sc_tbufaddr[i] += offset;
        }
}

static int
nm93c06_read(bus_space_tag_t iot, bus_space_handle_t ioh, int nm93c06reg)
{
        int bar;
        int shift;
        int bits = 0x180 | (nm93c06reg & 0xf);
        int data = 0;

        bar = 1 << BVME410_CS_SHIFT;
        bus_space_write_2(iot, ioh, BVME410_BAR, bar);
        delay(1); /* tCSS = 1 us */
        for (shift = 9; shift >= 0; shift--) {
                if (((bits >> shift) & 1) == 1)
                        bar |= 1 << BVME410_DIN_SHIFT;
                else
                        bar &= ~(1 << BVME410_DIN_SHIFT);
                bus_space_write_2(iot, ioh, BVME410_BAR, bar);
                delay(1); /* tDIS = 0.4 us */
                bar |= 1 << BVME410_CLK_SHIFT;
                bus_space_write_2(iot, ioh, BVME410_BAR, bar);
                delay(2); /* tSKH = 1 us, tSKH + tSKL >= 4 us */
                bar &= ~(1 << BVME410_CLK_SHIFT);
                bus_space_write_2(iot, ioh, BVME410_BAR, bar);
                delay(2); /* tSKL = 1 us, tSKH + tSKL >= 4 us */
        }
        bar &= ~(1 << BVME410_DIN_SHIFT);
        for (shift = 15; shift >= 0; shift--) {
                delay(1); /* tDIS = 100 ns, BVM manual says 0.4 us */
                bar |= 1 << BVME410_CLK_SHIFT;
                bus_space_write_2(iot, ioh, BVME410_BAR, bar);
                delay(2); /* tSKH = 1 us, tSKH + tSKL >= 4 us */
                data |= (bus_space_read_2(iot, ioh, BVME410_BAR) & 1) << shift;
                bar &= ~(1 << BVME410_CLK_SHIFT);
                bus_space_write_2(iot, ioh, BVME410_BAR, bar);
                delay(2); /* tSKL = 1 us, tSKH + tSKL >= 4 us */
        }
        bar &= ~(1 << BVME410_CS_SHIFT);
        bus_space_write_2(iot, ioh, BVME410_BAR, bar);
        delay(1); /* tCS = 1 us */
        return data;
}

static int
bvme410_probe(bus_space_tag_t iot, bus_space_handle_t ioh)
{

        if (!bus_space_peek_2(iot, ioh, BVME410_IVEC))
                return 0;

        bus_space_write_2(iot, ioh, BVME410_IVEC, 0x0000);
        if (bus_space_read_2(iot, ioh, BVME410_IVEC) != 0xff00)
                return 0;
        
        bus_space_write_2(iot, ioh, BVME410_IVEC, 0xffff);
        if (bus_space_read_2(iot, ioh, BVME410_IVEC) != 0xffff)
                return 0;

        bus_space_write_2(iot, ioh, BVME410_IVEC, 0xa5a5);
        if (bus_space_read_2(iot, ioh, BVME410_IVEC) != 0xffa5)
                return 0;

        return 1;
}

static int
bvme410_mem_size(bus_space_tag_t memt, u_long mem_addr)
{
        bus_space_handle_t memh;
        int r;

        if (bus_space_map(memt, mem_addr, 256 * 1024, 0, &memh))
                return VMECF_MEMSIZ_DEFAULT;
        if (!bus_space_peek_1(memt, memh, 0)) {
                bus_space_unmap(memt, memh, 256 * 1024);
                return VMECF_MEMSIZ_DEFAULT;
        }
        bus_space_write_1(memt, memh, 0, 128);
        bus_space_write_1(memt, memh, 64 * 1024, 32);
        bus_space_write_1(memt, memh, 32 * 1024, 8);
        r = (int)(bus_space_read_1(memt, memh, 0) * 2048);
        bus_space_unmap(memt, memh, 256 * 1024);
        return r;
}

/*
 * Need to be careful when writing to the bvme410 dual port memory.
 * Continue writing each byte until it reads back the same.
 */

static void
bvme410_copytobuf(struct lance_softc *sc, void *from, int boff, int len)
{
        volatile char *buf = (volatile char *)sc->sc_mem;
        char *f = (char *)from;

        for (buf += boff; len; buf++,f++,len--)
                do {
                        *buf = *f;
                } while (*buf != *f);
}

static void
bvme410_zerobuf(struct lance_softc *sc, int boff, int len)
{
        volatile char *buf = (volatile char *)sc->sc_mem;

        for (buf += boff; len; buf++,len--)
                do {
                        *buf = '\0';
                } while (*buf != '\0');
}