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[netbsd-mini2440.git] / sys / dev / isa / if_ec.c

/*      $NetBSD: if_ec.c,v 1.32 2008/03/12 14:31:11 cube Exp $  */

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

/*
 * Device driver for National Semiconductor DS8390/WD83C690 based ethernet
 * adapters.
 *
 * Copyright (c) 1994, 1995 Charles M. Hannum.  All rights reserved.
 *
 * Copyright (C) 1993, David Greenman.  This software may be used, modified,
 * copied, distributed, and sold, in both source and binary form provided that
 * the above copyright and these terms are retained.  Under no circumstances is
 * the author responsible for the proper functioning of this software, nor does
 * the author assume any responsibility for damages incurred with its use.
 */

/*
 * Device driver for the 3Com Etherlink II (3c503).
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ec.c,v 1.32 2008/03/12 14:31:11 cube Exp $");

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

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

#include <net/if_ether.h>

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

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>

#include <dev/ic/dp8390reg.h>
#include <dev/ic/dp8390var.h>

#include <dev/isa/if_ecreg.h>

struct ec_softc {
        struct dp8390_softc sc_dp8390;

        bus_space_tag_t sc_asict;       /* space tag for ASIC */
        bus_space_handle_t sc_asich;    /* space handle for ASIC */

        int sc_16bitp;                  /* are we 16 bit? */

        void *sc_ih;                    /* interrupt handle */
};

int     ec_probe(device_t, cfdata_t, void *);
void    ec_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ec, sizeof(struct ec_softc),
    ec_probe, ec_attach, NULL, NULL);

int     ec_set_media(struct ec_softc *, int);

void    ec_media_init(struct dp8390_softc *);

int     ec_mediachange(struct dp8390_softc *);
void    ec_mediastatus(struct dp8390_softc *, struct ifmediareq *);

void    ec_init_card(struct dp8390_softc *);
int     ec_write_mbuf(struct dp8390_softc *, struct mbuf *, int);
int     ec_ring_copy(struct dp8390_softc *, int, void *, u_short);
void    ec_read_hdr(struct dp8390_softc *, int, struct dp8390_ring *);
int     ec_fake_test_mem(struct dp8390_softc *);
int     ec_test_mem(struct dp8390_softc *);

inline void ec_readmem(struct ec_softc *, int, u_int8_t *, int);

static const int ec_iobase[] = {
        0x2e0, 0x2a0, 0x280, 0x250, 0x350, 0x330, 0x310, 0x300,
};
#define NEC_IOBASE      (sizeof(ec_iobase) / sizeof(ec_iobase[0]))

static const int ec_membase[] = {
        -1, -1, -1, -1,
        0xc8000, 0xcc000, 0xd8000, 0xdc000,
};
#define NEC_MEMBASE     (sizeof(ec_membase) / sizeof(ec_membase[0]))

int
ec_probe(device_t parent, cfdata_t match, void *aux)
{
        struct isa_attach_args *ia = aux;
        bus_space_tag_t nict, asict, memt;
        bus_space_handle_t nich, asich, memh;
        bus_size_t memsize;
        int nich_valid, asich_valid, memh_valid;
        int i, rv = 0;
        u_int8_t x;

        nict = asict = ia->ia_iot;
        memt = ia->ia_memt;

        nich_valid = asich_valid = memh_valid = 0;

        /*
         * Hmm, a 16-bit card has 16k of memory, but only an 8k window
         * to it.
         */
        memsize = 8192;

        if (ia->ia_nio < 1)
                return (0);
        if (ia->ia_niomem < 1)
                return (0);
        if (ia->ia_nirq < 1)
                return (0);

        if (ISA_DIRECT_CONFIG(ia))
                return (0);

        /* Disallow wildcarded i/o addresses. */
        if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
                return (0);

        /* Disallow wildcarded mem address. */
        if (ia->ia_iomem[0].ir_addr == ISA_UNKNOWN_IOMEM)
                return (0);

        /* Validate the i/o base. */
        for (i = 0; i < NEC_IOBASE; i++)
                if (ia->ia_io[0].ir_addr == ec_iobase[i])
                        break;
        if (i == NEC_IOBASE)
                return (0);

        /* Validate the mem base. */
        for (i = 0; i < NEC_MEMBASE; i++) {
                if (ec_membase[i] == -1)
                        continue;
                if (ia->ia_iomem[0].ir_addr == ec_membase[i])
                        break;
        }
        if (i == NEC_MEMBASE)
                return (0);

        /* Attempt to map the NIC space. */
        if (bus_space_map(nict, ia->ia_io[0].ir_addr + ELINK2_NIC_OFFSET,
            ELINK2_NIC_PORTS, 0, &nich))
                goto out;
        nich_valid = 1;

        /* Attempt to map the ASIC space. */
        if (bus_space_map(asict, ia->ia_io[0].ir_addr + ELINK2_ASIC_OFFSET,
            ELINK2_ASIC_PORTS, 0, &asich))
                goto out;
        asich_valid = 1;

        /* Attempt to map the memory space. */
        if (bus_space_map(memt, ia->ia_iomem[0].ir_addr, memsize, 0, &memh))
                goto out;
        memh_valid = 1;

        /*
         * Verify that the kernel configured I/O address matches the
         * board configured I/O address.
         *
         * This is really only useful to see if something that looks like
         * the board is there; after all, we're already talking to it at
         * this point.
         */
        x = bus_space_read_1(asict, asich, ELINK2_BCFR);
        if (x == 0 || (x & (x - 1)) != 0)
                goto out;
        i = ffs(x) - 1;
        if (ia->ia_io[0].ir_addr != ec_iobase[i])
                goto out;

        /*
         * ...and for the memory address.  Note we do not support
         * cards configured with shared memory disabled.
         */
        x = bus_space_read_1(asict, asich, ELINK2_PCFR);
        if (x == 0 || (x & (x - 1)) != 0)
                goto out;
        i = ffs(x) - 1;
        if (ia->ia_iomem[0].ir_addr != ec_membase[i])
                goto out;

        /* So, we say we've found it! */
        ia->ia_nio = 1;         /* XXX Really 2! */
        ia->ia_io[0].ir_size = ELINK2_NIC_PORTS;

        ia->ia_niomem = 1;
        ia->ia_iomem[0].ir_size = memsize;

        ia->ia_nirq = 1;

        ia->ia_ndrq = 0;

        rv = 1;

 out:
        if (nich_valid)
                bus_space_unmap(nict, nich, ELINK2_NIC_PORTS);
        if (asich_valid)
                bus_space_unmap(asict, asich, ELINK2_ASIC_PORTS);
        if (memh_valid)
                bus_space_unmap(memt, memh, memsize);
        return (rv);
}

void
ec_attach(device_t parent, device_t self, void *aux)
{
        struct ec_softc *esc = device_private(self);
        struct dp8390_softc *sc = &esc->sc_dp8390;
        struct isa_attach_args *ia = aux;
        bus_space_tag_t nict, asict, memt;
        bus_space_handle_t nich, asich, memh;
        bus_size_t memsize;
        u_int8_t tmp;
        int i;

        sc->sc_dev = self;
        aprint_normal("\n");

        nict = asict = ia->ia_iot;
        memt = ia->ia_memt;

        /*
         * Hmm, a 16-bit card has 16k of memory, but only an 8k window
         * to it.
         */
        memsize = ia->ia_iomem[0].ir_size;

        /* Map the NIC space. */
        if (bus_space_map(nict, ia->ia_io[0].ir_addr + ELINK2_NIC_OFFSET,
            ELINK2_NIC_PORTS, 0, &nich)) {
                aprint_error_dev(self, "can't map nic i/o space\n");
                return;
        }

        /* Map the ASIC space. */
        if (bus_space_map(asict, ia->ia_io[0].ir_addr + ELINK2_ASIC_OFFSET,
            ELINK2_ASIC_PORTS, 0, &asich)) {
                aprint_error_dev(self, "can't map asic i/o space\n");
                return;
        }

        /* Map the memory space. */
        if (bus_space_map(memt, ia->ia_iomem[0].ir_addr, memsize, 0, &memh)) {
                aprint_error_dev(self, "can't map shared memory\n");
                return;
        }

        esc->sc_asict = asict;
        esc->sc_asich = asich;

        sc->sc_regt = nict;
        sc->sc_regh = nich;

        sc->sc_buft = memt;
        sc->sc_bufh = memh;

        /* Interface is always enabled. */
        sc->sc_enabled = 1;

        /* Registers are linear. */
        for (i = 0; i < 16; i++)
                sc->sc_reg_map[i] = i;

        /* Now we can use the NIC_{GET,PUT}() macros. */

        /*
         * Reset NIC and ASIC.  Enable on-board transeiver throughout
         * reset sequence since it will lock up if the cable isn't
         * connected if we don't.
         */
        bus_space_write_1(asict, asich, ELINK2_CR,
            ELINK2_CR_RST | ELINK2_CR_XSEL);

        /* Wait for a while, then un-reset it. */
        delay(50);

        /*
         * The 3Com ASIC defaults to rather strange settings for the CR
         * after a reset.  It's important to set it again after the
         * following write (this is done when we map the PROM below).
         */
        bus_space_write_1(asict, asich, ELINK2_CR, ELINK2_CR_XSEL);

        /* Wait a bit for the NIC to recover from the reset. */
        delay(5000);

        /*
         * Get the station address from on-board ROM.
         *
         * First, map Ethernet address PROM over the top of where the NIC
         * registers normally appear.
         */
        bus_space_write_1(asict, asich, ELINK2_CR,
            ELINK2_CR_XSEL | ELINK2_CR_EALO);

        for (i = 0; i < ETHER_ADDR_LEN; i++)
                sc->sc_enaddr[i] = NIC_GET(nict, nich, i);

        /*
         * Unmap PROM - select NIC registers.  The proper setting of the
         * transceiver is set in later in ec_init_card() via dp8390_init().
         */
        bus_space_write_1(asict, asich, ELINK2_CR, ELINK2_CR_XSEL);

        /* Determine if this is an 8-bit or 16-bit board. */

        /* Select page 0 registers. */
        NIC_PUT(nict, nich, ED_P0_CR, ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STP);

        /*
         * Attempt to clear WTS.  If it doesn't clear, then this is a
         * 16-bit board.
         */
        NIC_PUT(nict, nich, ED_P0_DCR, 0);

        /* Select page 2 registers. */
        NIC_PUT(nict, nich, ED_P0_CR, ED_CR_RD2 | ED_CR_PAGE_2 | ED_CR_STP);

        /* The 3c503 forces the WTS bit to a one if this is a 16-bit board. */
        if (NIC_GET(nict, nich, ED_P2_DCR) & ED_DCR_WTS)
                esc->sc_16bitp = 1;
        else
                esc->sc_16bitp = 0;

        aprint_normal_dev(self, "3Com 3c503 Ethernet (%s-bit)\n",
            esc->sc_16bitp ? "16" : "8");

        /* Select page 0 registers. */
        NIC_PUT(nict, nich, ED_P2_CR, ED_CR_RD2 | ED_CR_PAGE_0 | ED_CR_STP);

        sc->cr_proto = ED_CR_RD2;

        /*
         * DCR gets:
         *
         *      FIFO threshold to 8, No auto-init Remote DMA,
         *      byte order=80x86.
         *
         * 16-bit cards also get word-wide DMA transfers.
         */
        sc->dcr_reg = ED_DCR_FT1 | ED_DCR_LS |
            (esc->sc_16bitp ? ED_DCR_WTS : 0);

        sc->test_mem = ec_fake_test_mem;
        sc->ring_copy = ec_ring_copy;
        sc->write_mbuf = ec_write_mbuf;
        sc->read_hdr = ec_read_hdr;
        sc->init_card = ec_init_card;

        sc->sc_media_init = ec_media_init;

        sc->sc_mediachange = ec_mediachange;
        sc->sc_mediastatus = ec_mediastatus;

        sc->mem_start = 0;
        sc->mem_size = memsize;

        /* Do generic parts of attach. */
        if (dp8390_config(sc)) {
                aprint_error_dev(self, " configuration failed\n");
                return;
        }

        /*
         * We need to override the way dp8390_config() set up our
         * shared memory.
         *
         * We have an entire 8k window to put the transmit buffers on the
         * 16-bit boards.  But since the 16bit 3c503's shared memory is only
         * fast enough to overlap the loading of one full-size packet, trying
         * to load more than 2 buffers can actually leave the transmitter idle
         * during the load.  So 2 seems the best value.  (Although a mix of
         * variable-sized packets might change this assumption.  Nonetheless,
         * we optimize for linear transfers of same-size packets.)
         */
        if (esc->sc_16bitp) {
                if (device_cfdata(sc->sc_dev)->cf_flags &
                    DP8390_NO_MULTI_BUFFERING)
                        sc->txb_cnt = 1;
                else
                        sc->txb_cnt = 2;

                sc->tx_page_start = ELINK2_TX_PAGE_OFFSET_16BIT;
                sc->rec_page_start = ELINK2_RX_PAGE_OFFSET_16BIT;
                sc->rec_page_stop = (memsize >> ED_PAGE_SHIFT) +
                    sc->rec_page_start;
                sc->mem_ring = sc->mem_start;
        } else {
                sc->txb_cnt = 1;
                sc->tx_page_start = ELINK2_TX_PAGE_OFFSET_8BIT;
                sc->rec_page_start = sc->tx_page_start + ED_TXBUF_SIZE;
                sc->rec_page_stop = (memsize >> ED_PAGE_SHIFT) +
                    sc->tx_page_start;
                sc->mem_ring = sc->mem_start +
                    (ED_TXBUF_SIZE << ED_PAGE_SHIFT);
        }

        /*
         * Initialize CA page start/stop registers.  Probably only needed
         * if doing DMA, but what the Hell.
         */
        bus_space_write_1(asict, asich, ELINK2_PSTR, sc->rec_page_start);
        bus_space_write_1(asict, asich, ELINK2_PSPR, sc->rec_page_stop);

        /*
         * Program the IRQ.
         */
        switch (ia->ia_irq[0].ir_irq) {
        case 9: tmp = ELINK2_IDCFR_IRQ2; break;
        case 3: tmp = ELINK2_IDCFR_IRQ3; break;
        case 4: tmp = ELINK2_IDCFR_IRQ4; break;
        case 5: tmp = ELINK2_IDCFR_IRQ5; break;
                break;

        case ISA_UNKNOWN_IRQ:
                aprint_error_dev(self, "wildcarded IRQ is not allowed\n");
                return;

        default:
                aprint_error_dev(self, "invalid IRQ %d, must be 3, 4, 5, "
                    "or 9\n", ia->ia_irq[0].ir_irq);
                return;
        }

        bus_space_write_1(asict, asich, ELINK2_IDCFR, tmp);

        /*
         * Initialize the GA configuration register.  Set bank and enable
         * shared memory.
         */
        bus_space_write_1(asict, asich, ELINK2_GACFR,
            ELINK2_GACFR_RSEL | ELINK2_GACFR_MBS0);

        /*
         * Intialize "Vector Pointer" registers.  These gawd-awful things
         * are compared to 20 bits of the address on the ISA, and if they
         * match, the shared memory is disabled.  We set them to 0xffff0...
         * allegedly the reset vector.
         */
        bus_space_write_1(asict, asich, ELINK2_VPTR2, 0xff);
        bus_space_write_1(asict, asich, ELINK2_VPTR1, 0xff);
        bus_space_write_1(asict, asich, ELINK2_VPTR0, 0x00);

        /*
         * Now run the real memory test.
         */
        if (ec_test_mem(sc)) {
                aprint_error_dev(self, "memory test failed\n");
                return;
        }

        /* Establish interrupt handler. */
        esc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
            IST_EDGE, IPL_NET, dp8390_intr, sc);
        if (esc->sc_ih == NULL)
                aprint_error_dev(self, "can't establish interrupt\n");
}

int
ec_fake_test_mem(struct dp8390_softc *sc)
{

        /*
         * We have to do this after we initialize the GA, but we
         * have to do that after calling dp8390_config(), which
         * wants to test memory.  Put this noop here, and then
         * actually test memory later.
         */
        return (0);
}

int
ec_test_mem(struct dp8390_softc *sc)
{
        struct ec_softc *esc = (struct ec_softc *)sc;
        bus_space_tag_t memt = sc->sc_buft;
        bus_space_handle_t memh = sc->sc_bufh;
        bus_size_t memsize = sc->mem_size;
        int i;

        if (esc->sc_16bitp)
                bus_space_set_region_2(memt, memh, 0, 0, memsize >> 1);
        else
                bus_space_set_region_1(memt, memh, 0, 0, memsize);

        if (esc->sc_16bitp) {
                for (i = 0; i < memsize; i += 2) {
                        if (bus_space_read_2(memt, memh, i) != 0)
                                goto fail;
                }
        } else {
                for (i = 0; i < memsize; i++) {
                        if (bus_space_read_1(memt, memh, i) != 0)
                                goto fail;
                }
        }

        return (0);

 fail:
        aprint_error_dev(sc->sc_dev,
            "failed to clear shared memory at offset 0x%x\n", i);
        return (1);
}

/*
 * Given a NIC memory source address and a host memory destination address,
 * copy 'len' from NIC to host using shared memory.  The 'len' is rounded
 * up to a word - ok as long as mbufs are word-sized.
 */
inline void
ec_readmem(struct ec_softc *esc, int from, uint8_t *to, int len)
{
        bus_space_tag_t memt = esc->sc_dp8390.sc_buft;
        bus_space_handle_t memh = esc->sc_dp8390.sc_bufh;

        if (len & 1)
                ++len;

        if (esc->sc_16bitp)
                bus_space_read_region_2(memt, memh, from, (u_int16_t *)to,
                    len >> 1);
        else
                bus_space_read_region_1(memt, memh, from, to, len);
}

int
ec_write_mbuf(struct dp8390_softc *sc, struct mbuf *m, int buf)
{
        struct ec_softc *esc = (struct ec_softc *)sc;
        bus_space_tag_t asict = esc->sc_asict;
        bus_space_handle_t asich = esc->sc_asich;
        bus_space_tag_t memt = esc->sc_dp8390.sc_buft;
        bus_space_handle_t memh = esc->sc_dp8390.sc_bufh;
        u_int8_t *data, savebyte[2];
        int savelen, len, leftover;
#ifdef DIAGNOSTIC
        u_int8_t *lim;
#endif

        savelen = m->m_pkthdr.len;

        /*
         * 8-bit boards are simple: we're already in the correct
         * page, and no alignment tricks are necessary.
         */
        if (esc->sc_16bitp == 0) {
                for (; m != NULL; buf += m->m_len, m = m->m_next)
                        bus_space_write_region_1(memt, memh, buf,
                            mtod(m, u_int8_t *), m->m_len);
                if (savelen < ETHER_MIN_LEN - ETHER_CRC_LEN) {
                        bus_space_set_region_1(memt, memh, buf,
                            0, ETHER_MIN_LEN - ETHER_CRC_LEN - savelen);
                        savelen = ETHER_MIN_LEN - ETHER_CRC_LEN;
                }
                return (savelen);
        }

        /*
         * If it's a 16-bit board, we have transmit buffers
         * in a different page; switch to it.
         */
        if (esc->sc_16bitp)
                bus_space_write_1(asict, asich, ELINK2_GACFR,
                    ELINK2_GACFR_RSEL);

        /* Start out with no leftover data. */
        leftover = 0;
        savebyte[0] = savebyte[1] = 0;

        for (; m != NULL; m = m->m_next) {
                len = m->m_len;
                if (len == 0)
                        continue;
                data = mtod(m, u_int8_t *);
#ifdef DIAGNOSTIC
                lim = data + len;
#endif
                while (len > 0) {
                        if (leftover) {
                                /*
                                 * Data left over (from mbuf or realignment).
                                 * Buffer the next byte, and write it and
                                 * the leftover data out.
                                 */
                                savebyte[1] = *data++;
                                len--;
                                bus_space_write_2(memt, memh, buf,
                                    *(u_int16_t *)savebyte);
                                buf += 2;
                                leftover = 0;
                        } else if (BUS_SPACE_ALIGNED_POINTER(data, u_int16_t)
                                   == 0) {
                                /*
                                 * Unaligned data; buffer the next byte.
                                 */
                                savebyte[0] = *data++;
                                len--;
                                leftover = 1;
                        } else {
                                /*
                                 * Aligned data; output contiguous words as
                                 * much as we can, then buffer the remaining
                                 * byte, if any.
                                 */
                                leftover = len & 1;
                                len &= ~1;
                                bus_space_write_region_2(memt, memh, buf,
                                    (u_int16_t *)data, len >> 1);
                                data += len;
                                buf += len;
                                if (leftover)
                                        savebyte[0] = *data++;
                                len = 0;
                        }
                }
                if (len < 0)
                        panic("ec_write_mbuf: negative len");
#ifdef DIAGNOSTIC
                if (data != lim)
                        panic("ec_write_mbuf: data != lim");
#endif
        }
        if (leftover) {
                savebyte[1] = 0;
                bus_space_write_2(memt, memh, buf, *(u_int16_t *)savebyte);
                buf += 2;
        }
        if (savelen < ETHER_MIN_LEN - ETHER_CRC_LEN) {
                bus_space_set_region_2(memt, memh, buf,
                    0, (ETHER_MIN_LEN - ETHER_CRC_LEN - savelen) >> 1);
                savelen = ETHER_MIN_LEN - ETHER_CRC_LEN;
        }

        /*
         * Switch back to receive page.
         */
        if (esc->sc_16bitp)
                bus_space_write_1(asict, asich, ELINK2_GACFR,
                    ELINK2_GACFR_RSEL | ELINK2_GACFR_MBS0);

        return (savelen);
}

int
ec_ring_copy(struct dp8390_softc *sc, int src, void *dst, u_short amount)
{
        struct ec_softc *esc = (struct ec_softc *)sc;
        u_short tmp_amount;

        /* Does copy wrap to lower addr in ring buffer? */
        if (src + amount > sc->mem_end) {
                tmp_amount = sc->mem_end - src;

                /* Copy amount up to end of NIC memory. */
                ec_readmem(esc, src, dst, tmp_amount);

                amount -= tmp_amount;
                src = sc->mem_ring;
                dst = (char *)dst + tmp_amount;
        }

        ec_readmem(esc, src, dst, amount);

        return (src + amount);
}

void
ec_read_hdr(struct dp8390_softc *sc, int packet_ptr,
    struct dp8390_ring *packet_hdrp)
{
        struct ec_softc *esc = (struct ec_softc *)sc;

        ec_readmem(esc, packet_ptr, (u_int8_t *)packet_hdrp,
            sizeof(struct dp8390_ring));
#if BYTE_ORDER == BIG_ENDIAN
        packet_hdrp->count = bswap16(packet_hdrp->count);
#endif
}

void
ec_media_init(struct dp8390_softc *sc)
{

        ifmedia_init(&sc->sc_media, 0, dp8390_mediachange, dp8390_mediastatus);
        ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_10_2, 0, NULL);
        ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_10_5, 0, NULL);
        ifmedia_set(&sc->sc_media, IFM_ETHER|IFM_10_2);
}

int
ec_mediachange(struct dp8390_softc *sc)
{
        struct ec_softc *esc = (struct ec_softc *)sc;
        struct ifmedia *ifm = &sc->sc_media;

        return (ec_set_media(esc, ifm->ifm_media));
}

void
ec_mediastatus(struct dp8390_softc *sc, struct ifmediareq *ifmr)
{
        struct ifmedia *ifm = &sc->sc_media;

        /*
         * The currently selected media is always the active media.
         */
        ifmr->ifm_active = ifm->ifm_cur->ifm_media;
}

void
ec_init_card(struct dp8390_softc *sc)
{
        struct ec_softc *esc = (struct ec_softc *)sc;
        struct ifmedia *ifm = &sc->sc_media;

        (void) ec_set_media(esc, ifm->ifm_cur->ifm_media);
}

int
ec_set_media(struct ec_softc *esc, int media)
{
        u_int8_t new;

        if (IFM_TYPE(media) != IFM_ETHER)
                return (EINVAL);

        switch (IFM_SUBTYPE(media)) {
        case IFM_10_2:
                new = ELINK2_CR_XSEL;
                break;

        case IFM_10_5:
                new = 0;
                break;

        default:
                return (EINVAL);
        }

        bus_space_write_1(esc->sc_asict, esc->sc_asich, ELINK2_CR, new);
        return (0);
}