- Better use of the busdma API.

[FreeBSD/FreeBSD.git] / sys / pci / if_ti.c

/*-
 * Copyright (c) 1997, 1998, 1999
 *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
 *
 * 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 Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
 * 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.
 */

/*
 * Alteon Networks Tigon PCI gigabit ethernet driver for FreeBSD.
 * Manuals, sample driver and firmware source kits are available
 * from http://www.alteon.com/support/openkits.
 *
 * Written by Bill Paul <wpaul@ctr.columbia.edu>
 * Electrical Engineering Department
 * Columbia University, New York City
 */

/*
 * The Alteon Networks Tigon chip contains an embedded R4000 CPU,
 * gigabit MAC, dual DMA channels and a PCI interface unit. NICs
 * using the Tigon may have anywhere from 512K to 2MB of SRAM. The
 * Tigon supports hardware IP, TCP and UCP checksumming, multicast
 * filtering and jumbo (9014 byte) frames. The hardware is largely
 * controlled by firmware, which must be loaded into the NIC during
 * initialization.
 *
 * The Tigon 2 contains 2 R4000 CPUs and requires a newer firmware
 * revision, which supports new features such as extended commands,
 * extended jumbo receive ring desciptors and a mini receive ring.
 *
 * Alteon Networks is to be commended for releasing such a vast amount
 * of development material for the Tigon NIC without requiring an NDA
 * (although they really should have done it a long time ago). With
 * any luck, the other vendors will finally wise up and follow Alteon's
 * stellar example.
 *
 * The firmware for the Tigon 1 and 2 NICs is compiled directly into
 * this driver by #including it as a C header file. This bloats the
 * driver somewhat, but it's the easiest method considering that the
 * driver code and firmware code need to be kept in sync. The source
 * for the firmware is not provided with the FreeBSD distribution since
 * compiling it requires a GNU toolchain targeted for mips-sgi-irix5.3.
 *
 * The following people deserve special thanks:
 * - Terry Murphy of 3Com, for providing a 3c985 Tigon 1 board
 *   for testing
 * - Raymond Lee of Netgear, for providing a pair of Netgear
 *   GA620 Tigon 2 boards for testing
 * - Ulf Zimmermann, for bringing the GA260 to my attention and
 *   convincing me to write this driver.
 * - Andrew Gallatin for providing FreeBSD/Alpha support.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_ti.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/conf.h>

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

#include <net/bpf.h>

#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>

#include <vm/vm.h>              /* for vtophys */
#include <vm/pmap.h>            /* for vtophys */
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>

/* #define TI_PRIVATE_JUMBOS */

#if !defined(TI_PRIVATE_JUMBOS)
#include <sys/sockio.h>
#include <sys/uio.h>
#include <sys/lock.h>
#include <sys/sf_buf.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_map.h>
#include <vm/vm_param.h>
#include <vm/vm_pageout.h>
#include <sys/vmmeter.h>
#include <vm/vm_page.h>
#include <vm/vm_object.h>
#include <vm/vm_kern.h>
#include <sys/proc.h>
#endif /* !TI_PRIVATE_JUMBOS */

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>

#include <sys/tiio.h>
#include <pci/if_tireg.h>
#include <pci/ti_fw.h>
#include <pci/ti_fw2.h>

#define TI_CSUM_FEATURES        (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_IP_FRAGS)
/*
 * We can only turn on header splitting if we're using extended receive
 * BDs.
 */
#if defined(TI_JUMBO_HDRSPLIT) && defined(TI_PRIVATE_JUMBOS)
#error "options TI_JUMBO_HDRSPLIT and TI_PRIVATE_JUMBOS are mutually exclusive"
#endif /* TI_JUMBO_HDRSPLIT && TI_JUMBO_HDRSPLIT */

struct ti_softc *tis[8];

typedef enum {
        TI_SWAP_HTON,
        TI_SWAP_NTOH
} ti_swap_type;


/*
 * Various supported device vendors/types and their names.
 */

static struct ti_type ti_devs[] = {
        { ALT_VENDORID, ALT_DEVICEID_ACENIC,
                "Alteon AceNIC 1000baseSX Gigabit Ethernet" },
        { ALT_VENDORID, ALT_DEVICEID_ACENIC_COPPER,
                "Alteon AceNIC 1000baseT Gigabit Ethernet" },
        { TC_VENDORID,  TC_DEVICEID_3C985,
                "3Com 3c985-SX Gigabit Ethernet" },
        { NG_VENDORID, NG_DEVICEID_GA620,
                "Netgear GA620 1000baseSX Gigabit Ethernet" },
        { NG_VENDORID, NG_DEVICEID_GA620T,
                "Netgear GA620 1000baseT Gigabit Ethernet" },
        { SGI_VENDORID, SGI_DEVICEID_TIGON,
                "Silicon Graphics Gigabit Ethernet" },
        { DEC_VENDORID, DEC_DEVICEID_FARALLON_PN9000SX,
                "Farallon PN9000SX Gigabit Ethernet" },
        { 0, 0, NULL }
};


static  d_open_t        ti_open;
static  d_close_t       ti_close;
static  d_ioctl_t       ti_ioctl2;

static struct cdevsw ti_cdevsw = {
        .d_version =    D_VERSION,
        .d_flags =      D_NEEDGIANT,
        .d_open =       ti_open,
        .d_close =      ti_close,
        .d_ioctl =      ti_ioctl2,
        .d_name =       "ti",
};

static int ti_probe(device_t);
static int ti_attach(device_t);
static int ti_detach(device_t);
static void ti_txeof(struct ti_softc *);
static void ti_rxeof(struct ti_softc *);

static void ti_stats_update(struct ti_softc *);
static int ti_encap(struct ti_softc *, struct mbuf *, u_int32_t *);

static void ti_intr(void *);
static void ti_start(struct ifnet *);
static int ti_ioctl(struct ifnet *, u_long, caddr_t);
static void ti_init(void *);
static void ti_init2(struct ti_softc *);
static void ti_stop(struct ti_softc *);
static void ti_watchdog(struct ifnet *);
static void ti_shutdown(device_t);
static int ti_ifmedia_upd(struct ifnet *);
static void ti_ifmedia_sts(struct ifnet *, struct ifmediareq *);

static u_int32_t ti_eeprom_putbyte(struct ti_softc *, int);
static u_int8_t ti_eeprom_getbyte(struct ti_softc *, int, u_int8_t *);
static int ti_read_eeprom(struct ti_softc *, caddr_t, int, int);

static void ti_add_mcast(struct ti_softc *, struct ether_addr *);
static void ti_del_mcast(struct ti_softc *, struct ether_addr *);
static void ti_setmulti(struct ti_softc *);

static void ti_mem(struct ti_softc *, u_int32_t, u_int32_t, caddr_t);
static int ti_copy_mem(struct ti_softc *, u_int32_t, u_int32_t, caddr_t, int, int);
static int ti_copy_scratch(struct ti_softc *, u_int32_t, u_int32_t, caddr_t,
                int, int, int);
static int ti_bcopy_swap(const void *, void *, size_t, ti_swap_type);
static void ti_loadfw(struct ti_softc *);
static void ti_cmd(struct ti_softc *, struct ti_cmd_desc *);
static void ti_cmd_ext(struct ti_softc *, struct ti_cmd_desc *, caddr_t, int);
static void ti_handle_events(struct ti_softc *);
#ifdef TI_PRIVATE_JUMBOS
static int ti_alloc_jumbo_mem(struct ti_softc *);
static void *ti_jalloc(struct ti_softc *);
static void ti_jfree(void *, void *);
#endif /* TI_PRIVATE_JUMBOS */
static int ti_newbuf_std(struct ti_softc *, int, struct mbuf *);
static int ti_newbuf_mini(struct ti_softc *, int, struct mbuf *);
static int ti_newbuf_jumbo(struct ti_softc *, int, struct mbuf *);
static int ti_init_rx_ring_std(struct ti_softc *);
static void ti_free_rx_ring_std(struct ti_softc *);
static int ti_init_rx_ring_jumbo(struct ti_softc *);
static void ti_free_rx_ring_jumbo(struct ti_softc *);
static int ti_init_rx_ring_mini(struct ti_softc *);
static void ti_free_rx_ring_mini(struct ti_softc *);
static void ti_free_tx_ring(struct ti_softc *);
static int ti_init_tx_ring(struct ti_softc *);

static int ti_64bitslot_war(struct ti_softc *);
static int ti_chipinit(struct ti_softc *);
static int ti_gibinit(struct ti_softc *);

#ifdef TI_JUMBO_HDRSPLIT
static __inline void ti_hdr_split       (struct mbuf *top, int hdr_len,
                                             int pkt_len, int idx);
#endif /* TI_JUMBO_HDRSPLIT */

static device_method_t ti_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         ti_probe),
        DEVMETHOD(device_attach,        ti_attach),
        DEVMETHOD(device_detach,        ti_detach),
        DEVMETHOD(device_shutdown,      ti_shutdown),
        { 0, 0 }
};

static driver_t ti_driver = {
        "ti",
        ti_methods,
        sizeof(struct ti_softc)
};

static devclass_t ti_devclass;

DRIVER_MODULE(ti, pci, ti_driver, ti_devclass, 0, 0);
MODULE_DEPEND(ti, pci, 1, 1, 1);
MODULE_DEPEND(ti, ether, 1, 1, 1);

/*
 * Send an instruction or address to the EEPROM, check for ACK.
 */
static u_int32_t ti_eeprom_putbyte(sc, byte)
        struct ti_softc         *sc;
        int                     byte;
{
        register int            i, ack = 0;

        /*
         * Make sure we're in TX mode.
         */
        TI_SETBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_TXEN);

        /*
         * Feed in each bit and stobe the clock.
         */
        for (i = 0x80; i; i >>= 1) {
                if (byte & i) {
                        TI_SETBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_DOUT);
                } else {
                        TI_CLRBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_DOUT);
                }
                DELAY(1);
                TI_SETBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_CLK);
                DELAY(1);
                TI_CLRBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_CLK);
        }

        /*
         * Turn off TX mode.
         */
        TI_CLRBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_TXEN);

        /*
         * Check for ack.
         */
        TI_SETBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_CLK);
        ack = CSR_READ_4(sc, TI_MISC_LOCAL_CTL) & TI_MLC_EE_DIN;
        TI_CLRBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_CLK);

        return (ack);
}

/*
 * Read a byte of data stored in the EEPROM at address 'addr.'
 * We have to send two address bytes since the EEPROM can hold
 * more than 256 bytes of data.
 */
static u_int8_t ti_eeprom_getbyte(sc, addr, dest)
        struct ti_softc         *sc;
        int                     addr;
        u_int8_t                *dest;
{
        register int            i;
        u_int8_t                byte = 0;

        EEPROM_START;

        /*
         * Send write control code to EEPROM.
         */
        if (ti_eeprom_putbyte(sc, EEPROM_CTL_WRITE)) {
                if_printf(sc->ti_ifp,
                    "failed to send write command, status: %x\n",
                    CSR_READ_4(sc, TI_MISC_LOCAL_CTL));
                return (1);
        }

        /*
         * Send first byte of address of byte we want to read.
         */
        if (ti_eeprom_putbyte(sc, (addr >> 8) & 0xFF)) {
                if_printf(sc->ti_ifp, "failed to send address, status: %x\n",
                    CSR_READ_4(sc, TI_MISC_LOCAL_CTL));
                return (1);
        }
        /*
         * Send second byte address of byte we want to read.
         */
        if (ti_eeprom_putbyte(sc, addr & 0xFF)) {
                if_printf(sc->ti_ifp, "failed to send address, status: %x\n",
                    CSR_READ_4(sc, TI_MISC_LOCAL_CTL));
                return (1);
        }

        EEPROM_STOP;
        EEPROM_START;
        /*
         * Send read control code to EEPROM.
         */
        if (ti_eeprom_putbyte(sc, EEPROM_CTL_READ)) {
                if_printf(sc->ti_ifp,
                    "failed to send read command, status: %x\n",
                    CSR_READ_4(sc, TI_MISC_LOCAL_CTL));
                return (1);
        }

        /*
         * Start reading bits from EEPROM.
         */
        TI_CLRBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_TXEN);
        for (i = 0x80; i; i >>= 1) {
                TI_SETBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_CLK);
                DELAY(1);
                if (CSR_READ_4(sc, TI_MISC_LOCAL_CTL) & TI_MLC_EE_DIN)
                        byte |= i;
                TI_CLRBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_EE_CLK);
                DELAY(1);
        }

        EEPROM_STOP;

        /*
         * No ACK generated for read, so just return byte.
         */

        *dest = byte;

        return (0);
}

/*
 * Read a sequence of bytes from the EEPROM.
 */
static int
ti_read_eeprom(sc, dest, off, cnt)
        struct ti_softc         *sc;
        caddr_t                 dest;
        int                     off;
        int                     cnt;
{
        int                     err = 0, i;
        u_int8_t                byte = 0;

        for (i = 0; i < cnt; i++) {
                err = ti_eeprom_getbyte(sc, off + i, &byte);
                if (err)
                        break;
                *(dest + i) = byte;
        }

        return (err ? 1 : 0);
}

/*
 * NIC memory access function. Can be used to either clear a section
 * of NIC local memory or (if buf is non-NULL) copy data into it.
 */
static void
ti_mem(sc, addr, len, buf)
        struct ti_softc         *sc;
        u_int32_t               addr, len;
        caddr_t                 buf;
{
        int                     segptr, segsize, cnt;
        caddr_t                 ti_winbase, ptr;

        segptr = addr;
        cnt = len;
        ti_winbase = (caddr_t)(sc->ti_vhandle + TI_WINDOW);
        ptr = buf;

        while (cnt) {
                if (cnt < TI_WINLEN)
                        segsize = cnt;
                else
                        segsize = TI_WINLEN - (segptr % TI_WINLEN);
                CSR_WRITE_4(sc, TI_WINBASE, (segptr & ~(TI_WINLEN - 1)));
                if (buf == NULL)
                        bzero((char *)ti_winbase + (segptr &
                            (TI_WINLEN - 1)), segsize);
                else {
                        bcopy((char *)ptr, (char *)ti_winbase +
                            (segptr & (TI_WINLEN - 1)), segsize);
                        ptr += segsize;
                }
                segptr += segsize;
                cnt -= segsize;
        }
}

static int
ti_copy_mem(sc, tigon_addr, len, buf, useraddr, readdata)
        struct ti_softc         *sc;
        u_int32_t               tigon_addr, len;
        caddr_t                 buf;
        int                     useraddr, readdata;
{
        int             segptr, segsize, cnt;
        caddr_t         ptr;
        u_int32_t       origwin;
        u_int8_t        tmparray[TI_WINLEN], tmparray2[TI_WINLEN];
        int             resid, segresid;
        int             first_pass;

        /*
         * At the moment, we don't handle non-aligned cases, we just bail.
         * If this proves to be a problem, it will be fixed.
         */
        if ((readdata == 0)
         && (tigon_addr & 0x3)) {
                if_printf(sc->ti_ifp, "ti_copy_mem: tigon address %#x isn't "
                    "word-aligned\n", tigon_addr);
                if_printf(sc->ti_ifp, "ti_copy_mem: unaligned writes aren't "
                    "yet supported\n");
                return (EINVAL);
        }

        segptr = tigon_addr & ~0x3;
        segresid = tigon_addr - segptr;

        /*
         * This is the non-aligned amount left over that we'll need to
         * copy.
         */
        resid = len & 0x3;

        /* Add in the left over amount at the front of the buffer */
        resid += segresid;

        cnt = len & ~0x3;
        /*
         * If resid + segresid is >= 4, add multiples of 4 to the count and
         * decrease the residual by that much.
         */
        cnt += resid & ~0x3;
        resid -= resid & ~0x3;

        ptr = buf;

        first_pass = 1;

        /*
         * Make sure we aren't interrupted while we're changing the window
         * pointer.
         */
        TI_LOCK(sc);

        /*
         * Save the old window base value.
         */
        origwin = CSR_READ_4(sc, TI_WINBASE);

        while (cnt) {
                bus_size_t ti_offset;

                if (cnt < TI_WINLEN)
                        segsize = cnt;
                else
                        segsize = TI_WINLEN - (segptr % TI_WINLEN);
                CSR_WRITE_4(sc, TI_WINBASE, (segptr & ~(TI_WINLEN - 1)));

                ti_offset = TI_WINDOW + (segptr & (TI_WINLEN -1));

                if (readdata) {

                        bus_space_read_region_4(sc->ti_btag,
                                                sc->ti_bhandle, ti_offset,
                                                (u_int32_t *)tmparray,
                                                segsize >> 2);
                        if (useraddr) {
                                /*
                                 * Yeah, this is a little on the kludgy
                                 * side, but at least this code is only
                                 * used for debugging.
                                 */
                                ti_bcopy_swap(tmparray, tmparray2, segsize,
                                              TI_SWAP_NTOH);

                                if (first_pass) {
                                        copyout(&tmparray2[segresid], ptr,
                                                segsize - segresid);
                                        first_pass = 0;
                                } else
                                        copyout(tmparray2, ptr, segsize);
                        } else {
                                if (first_pass) {

                                        ti_bcopy_swap(tmparray, tmparray2,
                                                      segsize, TI_SWAP_NTOH);
                                        bcopy(&tmparray2[segresid], ptr,
                                              segsize - segresid);
                                        first_pass = 0;
                                } else
                                        ti_bcopy_swap(tmparray, ptr, segsize,
                                                      TI_SWAP_NTOH);
                        }

                } else {
                        if (useraddr) {
                                copyin(ptr, tmparray2, segsize);
                                ti_bcopy_swap(tmparray2, tmparray, segsize,
                                              TI_SWAP_HTON);
                        } else
                                ti_bcopy_swap(ptr, tmparray, segsize,
                                              TI_SWAP_HTON);

                        bus_space_write_region_4(sc->ti_btag,
                                                 sc->ti_bhandle, ti_offset,
                                                 (u_int32_t *)tmparray,
                                                 segsize >> 2);
                }
                segptr += segsize;
                ptr += segsize;
                cnt -= segsize;
        }

        /*
         * Handle leftover, non-word-aligned bytes.
         */
        if (resid != 0) {
                u_int32_t       tmpval, tmpval2;
                bus_size_t      ti_offset;

                /*
                 * Set the segment pointer.
                 */
                CSR_WRITE_4(sc, TI_WINBASE, (segptr & ~(TI_WINLEN - 1)));

                ti_offset = TI_WINDOW + (segptr & (TI_WINLEN - 1));

                /*
                 * First, grab whatever is in our source/destination.
                 * We'll obviously need this for reads, but also for
                 * writes, since we'll be doing read/modify/write.
                 */
                bus_space_read_region_4(sc->ti_btag, sc->ti_bhandle,
                                        ti_offset, &tmpval, 1);

                /*
                 * Next, translate this from little-endian to big-endian
                 * (at least on i386 boxes).
                 */
                tmpval2 = ntohl(tmpval);

                if (readdata) {
                        /*
                         * If we're reading, just copy the leftover number
                         * of bytes from the host byte order buffer to
                         * the user's buffer.
                         */
                        if (useraddr)
                                copyout(&tmpval2, ptr, resid);
                        else
                                bcopy(&tmpval2, ptr, resid);
                } else {
                        /*
                         * If we're writing, first copy the bytes to be
                         * written into the network byte order buffer,
                         * leaving the rest of the buffer with whatever was
                         * originally in there.  Then, swap the bytes
                         * around into host order and write them out.
                         *
                         * XXX KDM the read side of this has been verified
                         * to work, but the write side of it has not been
                         * verified.  So user beware.
                         */
                        if (useraddr)
                                copyin(ptr, &tmpval2, resid);
                        else
                                bcopy(ptr, &tmpval2, resid);

                        tmpval = htonl(tmpval2);

                        bus_space_write_region_4(sc->ti_btag, sc->ti_bhandle,
                                                 ti_offset, &tmpval, 1);
                }
        }

        CSR_WRITE_4(sc, TI_WINBASE, origwin);

        TI_UNLOCK(sc);

        return (0);
}

static int
ti_copy_scratch(sc, tigon_addr, len, buf, useraddr, readdata, cpu)
        struct ti_softc         *sc;
        u_int32_t               tigon_addr, len;
        caddr_t                 buf;
        int                     useraddr, readdata;
        int                     cpu;
{
        u_int32_t       segptr;
        int             cnt;
        u_int32_t       tmpval, tmpval2;
        caddr_t         ptr;

        /*
         * At the moment, we don't handle non-aligned cases, we just bail.
         * If this proves to be a problem, it will be fixed.
         */
        if (tigon_addr & 0x3) {
                if_printf(sc->ti_ifp, "ti_copy_scratch: tigon address %#x "
                    "isn't word-aligned\n", tigon_addr);
                return (EINVAL);
        }

        if (len & 0x3) {
                if_printf(sc->ti_ifp, "ti_copy_scratch: transfer length %d "
                    "isn't word-aligned\n", len);
                return (EINVAL);
        }

        segptr = tigon_addr;
        cnt = len;
        ptr = buf;

        TI_LOCK(sc);

        while (cnt) {
                CSR_WRITE_4(sc, CPU_REG(TI_SRAM_ADDR, cpu), segptr);

                if (readdata) {
                        tmpval2 = CSR_READ_4(sc, CPU_REG(TI_SRAM_DATA, cpu));

                        tmpval = ntohl(tmpval2);

                        /*
                         * Note:  I've used this debugging interface
                         * extensively with Alteon's 12.3.15 firmware,
                         * compiled with GCC 2.7.2.1 and binutils 2.9.1.
                         *
                         * When you compile the firmware without
                         * optimization, which is necessary sometimes in
                         * order to properly step through it, you sometimes
                         * read out a bogus value of 0xc0017c instead of
                         * whatever was supposed to be in that scratchpad
                         * location.  That value is on the stack somewhere,
                         * but I've never been able to figure out what was
                         * causing the problem.
                         *
                         * The address seems to pop up in random places,
                         * often not in the same place on two subsequent
                         * reads.
                         *
                         * In any case, the underlying data doesn't seem
                         * to be affected, just the value read out.
                         *
                         * KDM, 3/7/2000
                         */

                        if (tmpval2 == 0xc0017c)
                                if_printf(sc->ti_ifp, "found 0xc0017c at %#x "
                                       "(tmpval2)\n", segptr);

                        if (tmpval == 0xc0017c)
                                if_printf(sc->ti_ifp, "found 0xc0017c at %#x "
                                       "(tmpval)\n", segptr);

                        if (useraddr)
                                copyout(&tmpval, ptr, 4);
                        else
                                bcopy(&tmpval, ptr, 4);
                } else {
                        if (useraddr)
                                copyin(ptr, &tmpval2, 4);
                        else
                                bcopy(ptr, &tmpval2, 4);

                        tmpval = htonl(tmpval2);

                        CSR_WRITE_4(sc, CPU_REG(TI_SRAM_DATA, cpu), tmpval);
                }

                cnt -= 4;
                segptr += 4;
                ptr += 4;
        }

        TI_UNLOCK(sc);

        return (0);
}

static int
ti_bcopy_swap(src, dst, len, swap_type)
        const void      *src;
        void            *dst;
        size_t          len;
        ti_swap_type    swap_type;
{
        const u_int8_t *tmpsrc;
        u_int8_t *tmpdst;
        size_t tmplen;

        if (len & 0x3) {
                printf("ti_bcopy_swap: length %zd isn't 32-bit aligned\n",
                       len);
                return (-1);
        }

        tmpsrc = src;
        tmpdst = dst;
        tmplen = len;

        while (tmplen) {
                if (swap_type == TI_SWAP_NTOH)
                        *(u_int32_t *)tmpdst =
                                ntohl(*(const u_int32_t *)tmpsrc);
                else
                        *(u_int32_t *)tmpdst =
                                htonl(*(const u_int32_t *)tmpsrc);

                tmpsrc += 4;
                tmpdst += 4;
                tmplen -= 4;
        }

        return (0);
}

/*
 * Load firmware image into the NIC. Check that the firmware revision
 * is acceptable and see if we want the firmware for the Tigon 1 or
 * Tigon 2.
 */
static void
ti_loadfw(sc)
        struct ti_softc         *sc;
{
        switch (sc->ti_hwrev) {
        case TI_HWREV_TIGON:
                if (tigonFwReleaseMajor != TI_FIRMWARE_MAJOR ||
                    tigonFwReleaseMinor != TI_FIRMWARE_MINOR ||
                    tigonFwReleaseFix != TI_FIRMWARE_FIX) {
                        if_printf(sc->ti_ifp, "firmware revision mismatch; "
                            "want %d.%d.%d, got %d.%d.%d\n",
                            TI_FIRMWARE_MAJOR, TI_FIRMWARE_MINOR,
                            TI_FIRMWARE_FIX, tigonFwReleaseMajor,
                            tigonFwReleaseMinor, tigonFwReleaseFix);
                        return;
                }
                ti_mem(sc, tigonFwTextAddr, tigonFwTextLen,
                    (caddr_t)tigonFwText);
                ti_mem(sc, tigonFwDataAddr, tigonFwDataLen,
                    (caddr_t)tigonFwData);
                ti_mem(sc, tigonFwRodataAddr, tigonFwRodataLen,
                    (caddr_t)tigonFwRodata);
                ti_mem(sc, tigonFwBssAddr, tigonFwBssLen, NULL);
                ti_mem(sc, tigonFwSbssAddr, tigonFwSbssLen, NULL);
                CSR_WRITE_4(sc, TI_CPU_PROGRAM_COUNTER, tigonFwStartAddr);
                break;
        case TI_HWREV_TIGON_II:
                if (tigon2FwReleaseMajor != TI_FIRMWARE_MAJOR ||
                    tigon2FwReleaseMinor != TI_FIRMWARE_MINOR ||
                    tigon2FwReleaseFix != TI_FIRMWARE_FIX) {
                        if_printf(sc->ti_ifp, "firmware revision mismatch; "
                            "want %d.%d.%d, got %d.%d.%d\n",
                            TI_FIRMWARE_MAJOR, TI_FIRMWARE_MINOR,
                            TI_FIRMWARE_FIX, tigon2FwReleaseMajor,
                            tigon2FwReleaseMinor, tigon2FwReleaseFix);
                        return;
                }
                ti_mem(sc, tigon2FwTextAddr, tigon2FwTextLen,
                    (caddr_t)tigon2FwText);
                ti_mem(sc, tigon2FwDataAddr, tigon2FwDataLen,
                    (caddr_t)tigon2FwData);
                ti_mem(sc, tigon2FwRodataAddr, tigon2FwRodataLen,
                    (caddr_t)tigon2FwRodata);
                ti_mem(sc, tigon2FwBssAddr, tigon2FwBssLen, NULL);
                ti_mem(sc, tigon2FwSbssAddr, tigon2FwSbssLen, NULL);
                CSR_WRITE_4(sc, TI_CPU_PROGRAM_COUNTER, tigon2FwStartAddr);
                break;
        default:
                if_printf(sc->ti_ifp,
                    "can't load firmware: unknown hardware rev\n");
                break;
        }
}

/*
 * Send the NIC a command via the command ring.
 */
static void
ti_cmd(sc, cmd)
        struct ti_softc         *sc;
        struct ti_cmd_desc      *cmd;
{
        u_int32_t               index;

        if (sc->ti_rdata->ti_cmd_ring == NULL)
                return;

        index = sc->ti_cmd_saved_prodidx;
        CSR_WRITE_4(sc, TI_GCR_CMDRING + (index * 4), *(u_int32_t *)(cmd));
        TI_INC(index, TI_CMD_RING_CNT);
        CSR_WRITE_4(sc, TI_MB_CMDPROD_IDX, index);
        sc->ti_cmd_saved_prodidx = index;
}

/*
 * Send the NIC an extended command. The 'len' parameter specifies the
 * number of command slots to include after the initial command.
 */
static void
ti_cmd_ext(sc, cmd, arg, len)
        struct ti_softc         *sc;
        struct ti_cmd_desc      *cmd;
        caddr_t                 arg;
        int                     len;
{
        u_int32_t               index;
        register int            i;

        if (sc->ti_rdata->ti_cmd_ring == NULL)
                return;

        index = sc->ti_cmd_saved_prodidx;
        CSR_WRITE_4(sc, TI_GCR_CMDRING + (index * 4), *(u_int32_t *)(cmd));
        TI_INC(index, TI_CMD_RING_CNT);
        for (i = 0; i < len; i++) {
                CSR_WRITE_4(sc, TI_GCR_CMDRING + (index * 4),
                    *(u_int32_t *)(&arg[i * 4]));
                TI_INC(index, TI_CMD_RING_CNT);
        }
        CSR_WRITE_4(sc, TI_MB_CMDPROD_IDX, index);
        sc->ti_cmd_saved_prodidx = index;
}

/*
 * Handle events that have triggered interrupts.
 */
static void
ti_handle_events(sc)
        struct ti_softc         *sc;
{
        struct ti_event_desc    *e;

        if (sc->ti_rdata->ti_event_ring == NULL)
                return;

        while (sc->ti_ev_saved_considx != sc->ti_ev_prodidx.ti_idx) {
                e = &sc->ti_rdata->ti_event_ring[sc->ti_ev_saved_considx];
                switch (e->ti_event) {
                case TI_EV_LINKSTAT_CHANGED:
                        sc->ti_linkstat = e->ti_code;
                        if (e->ti_code == TI_EV_CODE_LINK_UP)
                                if_printf(sc->ti_ifp, "10/100 link up\n");
                        else if (e->ti_code == TI_EV_CODE_GIG_LINK_UP)
                                if_printf(sc->ti_ifp, "gigabit link up\n");
                        else if (e->ti_code == TI_EV_CODE_LINK_DOWN)
                                if_printf(sc->ti_ifp, "link down\n");
                        break;
                case TI_EV_ERROR:
                        if (e->ti_code == TI_EV_CODE_ERR_INVAL_CMD)
                                if_printf(sc->ti_ifp, "invalid command\n");
                        else if (e->ti_code == TI_EV_CODE_ERR_UNIMP_CMD)
                                if_printf(sc->ti_ifp, "unknown command\n");
                        else if (e->ti_code == TI_EV_CODE_ERR_BADCFG)
                                if_printf(sc->ti_ifp, "bad config data\n");
                        break;
                case TI_EV_FIRMWARE_UP:
                        ti_init2(sc);
                        break;
                case TI_EV_STATS_UPDATED:
                        ti_stats_update(sc);
                        break;
                case TI_EV_RESET_JUMBO_RING:
                case TI_EV_MCAST_UPDATED:
                        /* Who cares. */
                        break;
                default:
                        if_printf(sc->ti_ifp, "unknown event: %d\n",
                            e->ti_event);
                        break;
                }
                /* Advance the consumer index. */
                TI_INC(sc->ti_ev_saved_considx, TI_EVENT_RING_CNT);
                CSR_WRITE_4(sc, TI_GCR_EVENTCONS_IDX, sc->ti_ev_saved_considx);
        }
}

#ifdef TI_PRIVATE_JUMBOS

/*
 * Memory management for the jumbo receive ring is a pain in the
 * butt. We need to allocate at least 9018 bytes of space per frame,
 * _and_ it has to be contiguous (unless you use the extended
 * jumbo descriptor format). Using malloc() all the time won't
 * work: malloc() allocates memory in powers of two, which means we
 * would end up wasting a considerable amount of space by allocating
 * 9K chunks. We don't have a jumbo mbuf cluster pool. Thus, we have
 * to do our own memory management.
 *
 * The driver needs to allocate a contiguous chunk of memory at boot
 * time. We then chop this up ourselves into 9K pieces and use them
 * as external mbuf storage.
 *
 * One issue here is how much memory to allocate. The jumbo ring has
 * 256 slots in it, but at 9K per slot than can consume over 2MB of
 * RAM. This is a bit much, especially considering we also need
 * RAM for the standard ring and mini ring (on the Tigon 2). To
 * save space, we only actually allocate enough memory for 64 slots
 * by default, which works out to between 500 and 600K. This can
 * be tuned by changing a #define in if_tireg.h.
 */

static int
ti_alloc_jumbo_mem(sc)
        struct ti_softc         *sc;
{
        caddr_t                 ptr;
        register int            i;
        struct ti_jpool_entry   *entry;

        /* Grab a big chunk o' storage. */
        sc->ti_cdata.ti_jumbo_buf = contigmalloc(TI_JMEM, M_DEVBUF,
                M_NOWAIT, 0, 0xffffffff, PAGE_SIZE, 0);

        if (sc->ti_cdata.ti_jumbo_buf == NULL) {
                if_printf(sc->ti_ifp, "no memory for jumbo buffers!\n");
                return (ENOBUFS);
        }

        SLIST_INIT(&sc->ti_jfree_listhead);
        SLIST_INIT(&sc->ti_jinuse_listhead);

        /*
         * Now divide it up into 9K pieces and save the addresses
         * in an array.
         */
        ptr = sc->ti_cdata.ti_jumbo_buf;
        for (i = 0; i < TI_JSLOTS; i++) {
                sc->ti_cdata.ti_jslots[i] = ptr;
                ptr += TI_JLEN;
                entry = malloc(sizeof(struct ti_jpool_entry),
                               M_DEVBUF, M_NOWAIT);
                if (entry == NULL) {
                        contigfree(sc->ti_cdata.ti_jumbo_buf, TI_JMEM,
                                   M_DEVBUF);
                        sc->ti_cdata.ti_jumbo_buf = NULL;
                        if_printf(sc->ti_ifp, "no memory for jumbo "
                            "buffer queue!\n");
                        return (ENOBUFS);
                }
                entry->slot = i;
                SLIST_INSERT_HEAD(&sc->ti_jfree_listhead, entry, jpool_entries);
        }

        return (0);
}

/*
 * Allocate a jumbo buffer.
 */
static void *ti_jalloc(sc)
        struct ti_softc         *sc;
{
        struct ti_jpool_entry   *entry;

        entry = SLIST_FIRST(&sc->ti_jfree_listhead);

        if (entry == NULL) {
                if_printf(sc->ti_ifp, "no free jumbo buffers\n");
                return (NULL);
        }

        SLIST_REMOVE_HEAD(&sc->ti_jfree_listhead, jpool_entries);
        SLIST_INSERT_HEAD(&sc->ti_jinuse_listhead, entry, jpool_entries);
        return (sc->ti_cdata.ti_jslots[entry->slot]);
}

/*
 * Release a jumbo buffer.
 */
static void
ti_jfree(buf, args)
        void                    *buf;
        void                    *args;
{
        struct ti_softc         *sc;
        int                     i;
        struct ti_jpool_entry   *entry;

        /* Extract the softc struct pointer. */
        sc = (struct ti_softc *)args;

        if (sc == NULL)
                panic("ti_jfree: didn't get softc pointer!");

        /* calculate the slot this buffer belongs to */
        i = ((vm_offset_t)buf
             - (vm_offset_t)sc->ti_cdata.ti_jumbo_buf) / TI_JLEN;

        if ((i < 0) || (i >= TI_JSLOTS))
                panic("ti_jfree: asked to free buffer that we don't manage!");

        entry = SLIST_FIRST(&sc->ti_jinuse_listhead);
        if (entry == NULL)
                panic("ti_jfree: buffer not in use!");
        entry->slot = i;
        SLIST_REMOVE_HEAD(&sc->ti_jinuse_listhead, jpool_entries);
        SLIST_INSERT_HEAD(&sc->ti_jfree_listhead, entry, jpool_entries);
}

#endif /* TI_PRIVATE_JUMBOS */

/*
 * Intialize a standard receive ring descriptor.
 */
static int
ti_newbuf_std(sc, i, m)
        struct ti_softc         *sc;
        int                     i;
        struct mbuf             *m;
{
        struct mbuf             *m_new = NULL;
        struct ti_rx_desc       *r;

        if (m == NULL) {
                MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                if (m_new == NULL)
                        return (ENOBUFS);

                MCLGET(m_new, M_DONTWAIT);
                if (!(m_new->m_flags & M_EXT)) {
                        m_freem(m_new);
                        return (ENOBUFS);
                }
                m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
        } else {
                m_new = m;
                m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
                m_new->m_data = m_new->m_ext.ext_buf;
        }

        m_adj(m_new, ETHER_ALIGN);
        sc->ti_cdata.ti_rx_std_chain[i] = m_new;
        r = &sc->ti_rdata->ti_rx_std_ring[i];
        TI_HOSTADDR(r->ti_addr) = vtophys(mtod(m_new, caddr_t));
        r->ti_type = TI_BDTYPE_RECV_BD;
        r->ti_flags = 0;
        if (sc->ti_ifp->if_hwassist)
                r->ti_flags |= TI_BDFLAG_TCP_UDP_CKSUM | TI_BDFLAG_IP_CKSUM;
        r->ti_len = m_new->m_len;
        r->ti_idx = i;

        return (0);
}

/*
 * Intialize a mini receive ring descriptor. This only applies to
 * the Tigon 2.
 */
static int
ti_newbuf_mini(sc, i, m)
        struct ti_softc         *sc;
        int                     i;
        struct mbuf             *m;
{
        struct mbuf             *m_new = NULL;
        struct ti_rx_desc       *r;

        if (m == NULL) {
                MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                if (m_new == NULL) {
                        return (ENOBUFS);
                }
                m_new->m_len = m_new->m_pkthdr.len = MHLEN;
        } else {
                m_new = m;
                m_new->m_data = m_new->m_pktdat;
                m_new->m_len = m_new->m_pkthdr.len = MHLEN;
        }

        m_adj(m_new, ETHER_ALIGN);
        r = &sc->ti_rdata->ti_rx_mini_ring[i];
        sc->ti_cdata.ti_rx_mini_chain[i] = m_new;
        TI_HOSTADDR(r->ti_addr) = vtophys(mtod(m_new, caddr_t));
        r->ti_type = TI_BDTYPE_RECV_BD;
        r->ti_flags = TI_BDFLAG_MINI_RING;
        if (sc->ti_ifp->if_hwassist)
                r->ti_flags |= TI_BDFLAG_TCP_UDP_CKSUM | TI_BDFLAG_IP_CKSUM;
        r->ti_len = m_new->m_len;
        r->ti_idx = i;

        return (0);
}

#ifdef TI_PRIVATE_JUMBOS

/*
 * Initialize a jumbo receive ring descriptor. This allocates
 * a jumbo buffer from the pool managed internally by the driver.
 */
static int
ti_newbuf_jumbo(sc, i, m)
        struct ti_softc         *sc;
        int                     i;
        struct mbuf             *m;
{
        struct mbuf             *m_new = NULL;
        struct ti_rx_desc       *r;

        if (m == NULL) {
                caddr_t                 *buf = NULL;

                /* Allocate the mbuf. */
                MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                if (m_new == NULL) {
                        return (ENOBUFS);
                }

                /* Allocate the jumbo buffer */
                buf = ti_jalloc(sc);
                if (buf == NULL) {
                        m_freem(m_new);
                        if_printf(sc->ti_ifp, "jumbo allocation failed "
                            "-- packet dropped!\n");
                        return (ENOBUFS);
                }

                /* Attach the buffer to the mbuf. */
                m_new->m_data = (void *) buf;
                m_new->m_len = m_new->m_pkthdr.len = TI_JUMBO_FRAMELEN;
                MEXTADD(m_new, buf, TI_JUMBO_FRAMELEN, ti_jfree,
                    (struct ti_softc *)sc, 0, EXT_NET_DRV);
        } else {
                m_new = m;
                m_new->m_data = m_new->m_ext.ext_buf;
                m_new->m_ext.ext_size = TI_JUMBO_FRAMELEN;
        }

        m_adj(m_new, ETHER_ALIGN);
        /* Set up the descriptor. */
        r = &sc->ti_rdata->ti_rx_jumbo_ring[i];
        sc->ti_cdata.ti_rx_jumbo_chain[i] = m_new;
        TI_HOSTADDR(r->ti_addr) = vtophys(mtod(m_new, caddr_t));
        r->ti_type = TI_BDTYPE_RECV_JUMBO_BD;
        r->ti_flags = TI_BDFLAG_JUMBO_RING;
        if (sc->ti_ifp->if_hwassist)
                r->ti_flags |= TI_BDFLAG_TCP_UDP_CKSUM | TI_BDFLAG_IP_CKSUM;
        r->ti_len = m_new->m_len;
        r->ti_idx = i;

        return (0);
}

#else
#include <vm/vm_page.h>

#if (PAGE_SIZE == 4096)
#define NPAYLOAD 2
#else
#define NPAYLOAD 1
#endif

#define TCP_HDR_LEN (52 + sizeof(struct ether_header))
#define UDP_HDR_LEN (28 + sizeof(struct ether_header))
#define NFS_HDR_LEN (UDP_HDR_LEN)
static int HDR_LEN =  TCP_HDR_LEN;


/*
 * Initialize a jumbo receive ring descriptor. This allocates
 * a jumbo buffer from the pool managed internally by the driver.
 */
static int
ti_newbuf_jumbo(sc, idx, m_old)
        struct ti_softc         *sc;
        int                     idx;
        struct mbuf             *m_old;
{
        struct mbuf             *cur, *m_new = NULL;
        struct mbuf             *m[3] = {NULL, NULL, NULL};
        struct ti_rx_desc_ext   *r;
        vm_page_t               frame;
        static int              color;
                                /* 1 extra buf to make nobufs easy*/
        struct sf_buf           *sf[3] = {NULL, NULL, NULL};
        int                     i;

        if (m_old != NULL) {
                m_new = m_old;
                cur = m_old->m_next;
                for (i = 0; i <= NPAYLOAD; i++){
                        m[i] = cur;
                        cur = cur->m_next;
                }
        } else {
                /* Allocate the mbufs. */
                MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                if (m_new == NULL) {
                        if_printf(sc->ti_ifp, "mbuf allocation failed "
                            "-- packet dropped!\n");
                        goto nobufs;
                }
                MGET(m[NPAYLOAD], M_DONTWAIT, MT_DATA);
                if (m[NPAYLOAD] == NULL) {
                        if_printf(sc->ti_ifp, "cluster mbuf allocation failed "
                            "-- packet dropped!\n");
                        goto nobufs;
                }
                MCLGET(m[NPAYLOAD], M_DONTWAIT);
                if ((m[NPAYLOAD]->m_flags & M_EXT) == 0) {
                        if_printf(sc->ti_ifp, "mbuf allocation failed "
                            "-- packet dropped!\n");
                        goto nobufs;
                }
                m[NPAYLOAD]->m_len = MCLBYTES;

                for (i = 0; i < NPAYLOAD; i++){
                        MGET(m[i], M_DONTWAIT, MT_DATA);
                        if (m[i] == NULL) {
                                if_printf(sc->ti_ifp, "mbuf allocation failed "
                                    "-- packet dropped!\n");
                                goto nobufs;
                        }
                        frame = vm_page_alloc(NULL, color++,
                            VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ |
                            VM_ALLOC_WIRED);
                        if (frame == NULL) {
                                if_printf(sc->ti_ifp, "buffer allocation "
                                    "failed -- packet dropped!\n");
                                printf("      index %d page %d\n", idx, i);
                                goto nobufs;
                        }
                        sf[i] = sf_buf_alloc(frame, SFB_NOWAIT);
                        if (sf[i] == NULL) {
                                vm_page_lock_queues();
                                vm_page_unwire(frame, 0);
                                vm_page_free(frame);
                                vm_page_unlock_queues();
                                if_printf(sc->ti_ifp, "buffer allocation "
                                    "failed -- packet dropped!\n");
                                printf("      index %d page %d\n", idx, i);
                                goto nobufs;
                        }
                }
                for (i = 0; i < NPAYLOAD; i++){
                /* Attach the buffer to the mbuf. */
                        m[i]->m_data = (void *)sf_buf_kva(sf[i]);
                        m[i]->m_len = PAGE_SIZE;
                        MEXTADD(m[i], sf_buf_kva(sf[i]), PAGE_SIZE,
                            sf_buf_mext, sf[i], 0, EXT_DISPOSABLE);
                        m[i]->m_next = m[i+1];
                }
                /* link the buffers to the header */
                m_new->m_next = m[0];
                m_new->m_data += ETHER_ALIGN;
                if (sc->ti_hdrsplit)
                        m_new->m_len = MHLEN - ETHER_ALIGN;
                else
                        m_new->m_len = HDR_LEN;
                m_new->m_pkthdr.len = NPAYLOAD * PAGE_SIZE + m_new->m_len;
        }

        /* Set up the descriptor. */
        r = &sc->ti_rdata->ti_rx_jumbo_ring[idx];
        sc->ti_cdata.ti_rx_jumbo_chain[idx] = m_new;
        TI_HOSTADDR(r->ti_addr0) = vtophys(mtod(m_new, caddr_t));
        r->ti_len0 = m_new->m_len;

        TI_HOSTADDR(r->ti_addr1) = vtophys(mtod(m[0], caddr_t));
        r->ti_len1 = PAGE_SIZE;

        TI_HOSTADDR(r->ti_addr2) = vtophys(mtod(m[1], caddr_t));
        r->ti_len2 = m[1]->m_ext.ext_size; /* could be PAGE_SIZE or MCLBYTES */

        if (PAGE_SIZE == 4096) {
                TI_HOSTADDR(r->ti_addr3) = vtophys(mtod(m[2], caddr_t));
                r->ti_len3 = MCLBYTES;
        } else {
                r->ti_len3 = 0;
        }
        r->ti_type = TI_BDTYPE_RECV_JUMBO_BD;

        r->ti_flags = TI_BDFLAG_JUMBO_RING|TI_RCB_FLAG_USE_EXT_RX_BD;

        if (sc->ti_ifp->if_hwassist)
                r->ti_flags |= TI_BDFLAG_TCP_UDP_CKSUM|TI_BDFLAG_IP_CKSUM;

        r->ti_idx = idx;

        return (0);

nobufs:

        /*
         * Warning! :
         * This can only be called before the mbufs are strung together.
         * If the mbufs are strung together, m_freem() will free the chain,
         * so that the later mbufs will be freed multiple times.
         */
        if (m_new)
                m_freem(m_new);

        for (i = 0; i < 3; i++) {
                if (m[i])
                        m_freem(m[i]);
                if (sf[i])
                        sf_buf_mext((void *)sf_buf_kva(sf[i]), sf[i]);
        }
        return (ENOBUFS);
}
#endif



/*
 * The standard receive ring has 512 entries in it. At 2K per mbuf cluster,
 * that's 1MB or memory, which is a lot. For now, we fill only the first
 * 256 ring entries and hope that our CPU is fast enough to keep up with
 * the NIC.
 */
static int
ti_init_rx_ring_std(sc)
        struct ti_softc         *sc;
{
        register int            i;
        struct ti_cmd_desc      cmd;

        for (i = 0; i < TI_SSLOTS; i++) {
                if (ti_newbuf_std(sc, i, NULL) == ENOBUFS)
                        return (ENOBUFS);
        };

        TI_UPDATE_STDPROD(sc, i - 1);
        sc->ti_std = i - 1;

        return (0);
}

static void
ti_free_rx_ring_std(sc)
        struct ti_softc         *sc;
{
        register int            i;

        for (i = 0; i < TI_STD_RX_RING_CNT; i++) {
                if (sc->ti_cdata.ti_rx_std_chain[i] != NULL) {
                        m_freem(sc->ti_cdata.ti_rx_std_chain[i]);
                        sc->ti_cdata.ti_rx_std_chain[i] = NULL;
                }
                bzero((char *)&sc->ti_rdata->ti_rx_std_ring[i],
                    sizeof(struct ti_rx_desc));
        }
}

static int
ti_init_rx_ring_jumbo(sc)
        struct ti_softc         *sc;
{
        register int            i;
        struct ti_cmd_desc      cmd;

        for (i = 0; i < TI_JUMBO_RX_RING_CNT; i++) {
                if (ti_newbuf_jumbo(sc, i, NULL) == ENOBUFS)
                        return (ENOBUFS);
        };

        TI_UPDATE_JUMBOPROD(sc, i - 1);
        sc->ti_jumbo = i - 1;

        return (0);
}

static void
ti_free_rx_ring_jumbo(sc)
        struct ti_softc         *sc;
{
        register int            i;

        for (i = 0; i < TI_JUMBO_RX_RING_CNT; i++) {
                if (sc->ti_cdata.ti_rx_jumbo_chain[i] != NULL) {
                        m_freem(sc->ti_cdata.ti_rx_jumbo_chain[i]);
                        sc->ti_cdata.ti_rx_jumbo_chain[i] = NULL;
                }
                bzero((char *)&sc->ti_rdata->ti_rx_jumbo_ring[i],
                    sizeof(struct ti_rx_desc));
        }
}

static int
ti_init_rx_ring_mini(sc)
        struct ti_softc         *sc;
{
        register int            i;

        for (i = 0; i < TI_MSLOTS; i++) {
                if (ti_newbuf_mini(sc, i, NULL) == ENOBUFS)
                        return (ENOBUFS);
        };

        TI_UPDATE_MINIPROD(sc, i - 1);
        sc->ti_mini = i - 1;

        return (0);
}

static void
ti_free_rx_ring_mini(sc)
        struct ti_softc         *sc;
{
        register int            i;

        for (i = 0; i < TI_MINI_RX_RING_CNT; i++) {
                if (sc->ti_cdata.ti_rx_mini_chain[i] != NULL) {
                        m_freem(sc->ti_cdata.ti_rx_mini_chain[i]);
                        sc->ti_cdata.ti_rx_mini_chain[i] = NULL;
                }
                bzero((char *)&sc->ti_rdata->ti_rx_mini_ring[i],
                    sizeof(struct ti_rx_desc));
        }
}

static void
ti_free_tx_ring(sc)
        struct ti_softc         *sc;
{
        register int            i;

        if (sc->ti_rdata->ti_tx_ring == NULL)
                return;

        for (i = 0; i < TI_TX_RING_CNT; i++) {
                if (sc->ti_cdata.ti_tx_chain[i] != NULL) {
                        m_freem(sc->ti_cdata.ti_tx_chain[i]);
                        sc->ti_cdata.ti_tx_chain[i] = NULL;
                }
                bzero((char *)&sc->ti_rdata->ti_tx_ring[i],
                    sizeof(struct ti_tx_desc));
        }
}

static int
ti_init_tx_ring(sc)
        struct ti_softc         *sc;
{
        sc->ti_txcnt = 0;
        sc->ti_tx_saved_considx = 0;
        CSR_WRITE_4(sc, TI_MB_SENDPROD_IDX, 0);
        return (0);
}

/*
 * The Tigon 2 firmware has a new way to add/delete multicast addresses,
 * but we have to support the old way too so that Tigon 1 cards will
 * work.
 */
static void
ti_add_mcast(sc, addr)
        struct ti_softc         *sc;
        struct ether_addr       *addr;
{
        struct ti_cmd_desc      cmd;
        u_int16_t               *m;
        u_int32_t               ext[2] = {0, 0};

        m = (u_int16_t *)&addr->octet[0];

        switch (sc->ti_hwrev) {
        case TI_HWREV_TIGON:
                CSR_WRITE_4(sc, TI_GCR_MAR0, htons(m[0]));
                CSR_WRITE_4(sc, TI_GCR_MAR1, (htons(m[1]) << 16) | htons(m[2]));
                TI_DO_CMD(TI_CMD_ADD_MCAST_ADDR, 0, 0);
                break;
        case TI_HWREV_TIGON_II:
                ext[0] = htons(m[0]);
                ext[1] = (htons(m[1]) << 16) | htons(m[2]);
                TI_DO_CMD_EXT(TI_CMD_EXT_ADD_MCAST, 0, 0, (caddr_t)&ext, 2);
                break;
        default:
                if_printf(sc->ti_ifp, "unknown hwrev\n");
                break;
        }
}

static void
ti_del_mcast(sc, addr)
        struct ti_softc         *sc;
        struct ether_addr       *addr;
{
        struct ti_cmd_desc      cmd;
        u_int16_t               *m;
        u_int32_t               ext[2] = {0, 0};

        m = (u_int16_t *)&addr->octet[0];

        switch (sc->ti_hwrev) {
        case TI_HWREV_TIGON:
                CSR_WRITE_4(sc, TI_GCR_MAR0, htons(m[0]));
                CSR_WRITE_4(sc, TI_GCR_MAR1, (htons(m[1]) << 16) | htons(m[2]));
                TI_DO_CMD(TI_CMD_DEL_MCAST_ADDR, 0, 0);
                break;
        case TI_HWREV_TIGON_II:
                ext[0] = htons(m[0]);
                ext[1] = (htons(m[1]) << 16) | htons(m[2]);
                TI_DO_CMD_EXT(TI_CMD_EXT_DEL_MCAST, 0, 0, (caddr_t)&ext, 2);
                break;
        default:
                if_printf(sc->ti_ifp, "unknown hwrev\n");
                break;
        }
}

/*
 * Configure the Tigon's multicast address filter.
 *
 * The actual multicast table management is a bit of a pain, thanks to
 * slight brain damage on the part of both Alteon and us. With our
 * multicast code, we are only alerted when the multicast address table
 * changes and at that point we only have the current list of addresses:
 * we only know the current state, not the previous state, so we don't
 * actually know what addresses were removed or added. The firmware has
 * state, but we can't get our grubby mits on it, and there is no 'delete
 * all multicast addresses' command. Hence, we have to maintain our own
 * state so we know what addresses have been programmed into the NIC at
 * any given time.
 */
static void
ti_setmulti(sc)
        struct ti_softc         *sc;
{
        struct ifnet            *ifp;
        struct ifmultiaddr      *ifma;
        struct ti_cmd_desc      cmd;
        struct ti_mc_entry      *mc;
        u_int32_t               intrs;

        ifp = sc->ti_ifp;

        if (ifp->if_flags & IFF_ALLMULTI) {
                TI_DO_CMD(TI_CMD_SET_ALLMULTI, TI_CMD_CODE_ALLMULTI_ENB, 0);
                return;
        } else {
                TI_DO_CMD(TI_CMD_SET_ALLMULTI, TI_CMD_CODE_ALLMULTI_DIS, 0);
        }

        /* Disable interrupts. */
        intrs = CSR_READ_4(sc, TI_MB_HOSTINTR);
        CSR_WRITE_4(sc, TI_MB_HOSTINTR, 1);

        /* First, zot all the existing filters. */
        while (SLIST_FIRST(&sc->ti_mc_listhead) != NULL) {
                mc = SLIST_FIRST(&sc->ti_mc_listhead);
                ti_del_mcast(sc, &mc->mc_addr);
                SLIST_REMOVE_HEAD(&sc->ti_mc_listhead, mc_entries);
                free(mc, M_DEVBUF);
        }

        /* Now program new ones. */
        IF_ADDR_LOCK(ifp);
        TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
                if (ifma->ifma_addr->sa_family != AF_LINK)
                        continue;
                mc = malloc(sizeof(struct ti_mc_entry), M_DEVBUF, M_NOWAIT);
                if (mc == NULL) {
                        if_printf(ifp, "no memory for mcast filter entry\n");
                        continue;
                }
                bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
                    (char *)&mc->mc_addr, ETHER_ADDR_LEN);
                SLIST_INSERT_HEAD(&sc->ti_mc_listhead, mc, mc_entries);
                ti_add_mcast(sc, &mc->mc_addr);
        }
        IF_ADDR_UNLOCK(ifp);

        /* Re-enable interrupts. */
        CSR_WRITE_4(sc, TI_MB_HOSTINTR, intrs);
}

/*
 * Check to see if the BIOS has configured us for a 64 bit slot when
 * we aren't actually in one. If we detect this condition, we can work
 * around it on the Tigon 2 by setting a bit in the PCI state register,
 * but for the Tigon 1 we must give up and abort the interface attach.
 */
static int ti_64bitslot_war(sc)
        struct ti_softc         *sc;
{
        if (!(CSR_READ_4(sc, TI_PCI_STATE) & TI_PCISTATE_32BIT_BUS)) {
                CSR_WRITE_4(sc, 0x600, 0);
                CSR_WRITE_4(sc, 0x604, 0);
                CSR_WRITE_4(sc, 0x600, 0x5555AAAA);
                if (CSR_READ_4(sc, 0x604) == 0x5555AAAA) {
                        if (sc->ti_hwrev == TI_HWREV_TIGON)
                                return (EINVAL);
                        else {
                                TI_SETBIT(sc, TI_PCI_STATE,
                                    TI_PCISTATE_32BIT_BUS);
                                return (0);
                        }
                }
        }

        return (0);
}

/*
 * Do endian, PCI and DMA initialization. Also check the on-board ROM
 * self-test results.
 */
static int
ti_chipinit(sc)
        struct ti_softc         *sc;
{
        u_int32_t               cacheline;
        u_int32_t               pci_writemax = 0;
        u_int32_t               hdrsplit;

        /* Initialize link to down state. */
        sc->ti_linkstat = TI_EV_CODE_LINK_DOWN;

        if (sc->ti_ifp->if_capenable & IFCAP_HWCSUM)
                sc->ti_ifp->if_hwassist = TI_CSUM_FEATURES;
        else
                sc->ti_ifp->if_hwassist = 0;

        /* Set endianness before we access any non-PCI registers. */
#if BYTE_ORDER == BIG_ENDIAN
        CSR_WRITE_4(sc, TI_MISC_HOST_CTL,
            TI_MHC_BIGENDIAN_INIT | (TI_MHC_BIGENDIAN_INIT << 24));
#else
        CSR_WRITE_4(sc, TI_MISC_HOST_CTL,
            TI_MHC_LITTLEENDIAN_INIT | (TI_MHC_LITTLEENDIAN_INIT << 24));
#endif

        /* Check the ROM failed bit to see if self-tests passed. */
        if (CSR_READ_4(sc, TI_CPU_STATE) & TI_CPUSTATE_ROMFAIL) {
                if_printf(sc->ti_ifp, "board self-diagnostics failed!\n");
                return (ENODEV);
        }

        /* Halt the CPU. */
        TI_SETBIT(sc, TI_CPU_STATE, TI_CPUSTATE_HALT);

        /* Figure out the hardware revision. */
        switch (CSR_READ_4(sc, TI_MISC_HOST_CTL) & TI_MHC_CHIP_REV_MASK) {
        case TI_REV_TIGON_I:
                sc->ti_hwrev = TI_HWREV_TIGON;
                break;
        case TI_REV_TIGON_II:
                sc->ti_hwrev = TI_HWREV_TIGON_II;
                break;
        default:
                if_printf(sc->ti_ifp, "unsupported chip revision\n");
                return (ENODEV);
        }

        /* Do special setup for Tigon 2. */
        if (sc->ti_hwrev == TI_HWREV_TIGON_II) {
                TI_SETBIT(sc, TI_CPU_CTL_B, TI_CPUSTATE_HALT);
                TI_SETBIT(sc, TI_MISC_LOCAL_CTL, TI_MLC_SRAM_BANK_512K);
                TI_SETBIT(sc, TI_MISC_CONF, TI_MCR_SRAM_SYNCHRONOUS);
        }

        /*
         * We don't have firmware source for the Tigon 1, so Tigon 1 boards
         * can't do header splitting.
         */
#ifdef TI_JUMBO_HDRSPLIT
        if (sc->ti_hwrev != TI_HWREV_TIGON)
                sc->ti_hdrsplit = 1;
        else
                if_printf(sc->ti_ifp,
                    "can't do header splitting on a Tigon I board\n");
#endif /* TI_JUMBO_HDRSPLIT */

        /* Set up the PCI state register. */
        CSR_WRITE_4(sc, TI_PCI_STATE, TI_PCI_READ_CMD|TI_PCI_WRITE_CMD);
        if (sc->ti_hwrev == TI_HWREV_TIGON_II) {
                TI_SETBIT(sc, TI_PCI_STATE, TI_PCISTATE_USE_MEM_RD_MULT);
        }

        /* Clear the read/write max DMA parameters. */
        TI_CLRBIT(sc, TI_PCI_STATE, (TI_PCISTATE_WRITE_MAXDMA|
            TI_PCISTATE_READ_MAXDMA));

        /* Get cache line size. */
        cacheline = CSR_READ_4(sc, TI_PCI_BIST) & 0xFF;

        /*
         * If the system has set enabled the PCI memory write
         * and invalidate command in the command register, set
         * the write max parameter accordingly. This is necessary
         * to use MWI with the Tigon 2.
         */
        if (CSR_READ_4(sc, TI_PCI_CMDSTAT) & PCIM_CMD_MWIEN) {
                switch (cacheline) {
                case 1:
                case 4:
                case 8:
                case 16:
                case 32:
                case 64:
                        break;
                default:
                /* Disable PCI memory write and invalidate. */
                        if (bootverbose)
                                if_printf(sc->ti_ifp, "cache line size %d not "
                                    "supported; disabling PCI MWI\n",
                                    cacheline);
                        CSR_WRITE_4(sc, TI_PCI_CMDSTAT, CSR_READ_4(sc,
                            TI_PCI_CMDSTAT) & ~PCIM_CMD_MWIEN);
                        break;
                }
        }

#ifdef __brokenalpha__
        /*
         * From the Alteon sample driver:
         * Must insure that we do not cross an 8K (bytes) boundary
         * for DMA reads.  Our highest limit is 1K bytes.  This is a
         * restriction on some ALPHA platforms with early revision
         * 21174 PCI chipsets, such as the AlphaPC 164lx
         */
        TI_SETBIT(sc, TI_PCI_STATE, pci_writemax|TI_PCI_READMAX_1024);
#else
        TI_SETBIT(sc, TI_PCI_STATE, pci_writemax);
#endif

        /* This sets the min dma param all the way up (0xff). */
        TI_SETBIT(sc, TI_PCI_STATE, TI_PCISTATE_MINDMA);

        if (sc->ti_hdrsplit)
                hdrsplit = TI_OPMODE_JUMBO_HDRSPLIT;
        else
                hdrsplit = 0;

        /* Configure DMA variables. */
#if BYTE_ORDER == BIG_ENDIAN
        CSR_WRITE_4(sc, TI_GCR_OPMODE, TI_OPMODE_BYTESWAP_BD |
            TI_OPMODE_BYTESWAP_DATA | TI_OPMODE_WORDSWAP_BD |
            TI_OPMODE_WARN_ENB | TI_OPMODE_FATAL_ENB |
            TI_OPMODE_DONT_FRAG_JUMBO | hdrsplit);
#else /* BYTE_ORDER */
        CSR_WRITE_4(sc, TI_GCR_OPMODE, TI_OPMODE_BYTESWAP_DATA|
            TI_OPMODE_WORDSWAP_BD|TI_OPMODE_DONT_FRAG_JUMBO|
            TI_OPMODE_WARN_ENB|TI_OPMODE_FATAL_ENB | hdrsplit);
#endif /* BYTE_ORDER */

        /*
         * Only allow 1 DMA channel to be active at a time.
         * I don't think this is a good idea, but without it
         * the firmware racks up lots of nicDmaReadRingFull
         * errors.  This is not compatible with hardware checksums.
         */
        if (sc->ti_ifp->if_hwassist == 0)
                TI_SETBIT(sc, TI_GCR_OPMODE, TI_OPMODE_1_DMA_ACTIVE);

        /* Recommended settings from Tigon manual. */
        CSR_WRITE_4(sc, TI_GCR_DMA_WRITECFG, TI_DMA_STATE_THRESH_8W);
        CSR_WRITE_4(sc, TI_GCR_DMA_READCFG, TI_DMA_STATE_THRESH_8W);

        if (ti_64bitslot_war(sc)) {
                if_printf(sc->ti_ifp, "bios thinks we're in a 64 bit slot, "
                    "but we aren't");
                return (EINVAL);
        }

        return (0);
}

#define TI_RD_OFF(x)    offsetof(struct ti_ring_data, x)

/*
 * Initialize the general information block and firmware, and
 * start the CPU(s) running.
 */
static int
ti_gibinit(sc)
        struct ti_softc         *sc;
{
        struct ti_rcb           *rcb;
        int                     i;
        struct ifnet            *ifp;
        uint32_t                rdphys;

        ifp = sc->ti_ifp;
        rdphys = sc->ti_rdata_phys;

        /* Disable interrupts for now. */
        CSR_WRITE_4(sc, TI_MB_HOSTINTR, 1);

        /*
         * Tell the chip where to find the general information block.
         * While this struct could go into >4GB memory, we allocate it in a
         * single slab with the other descriptors, and those don't seem to
         * support being located in a 64-bit region.
         */
        CSR_WRITE_4(sc, TI_GCR_GENINFO_HI, 0);
        CSR_WRITE_4(sc, TI_GCR_GENINFO_LO, rdphys + TI_RD_OFF(ti_info));

        /* Load the firmware into SRAM. */
        ti_loadfw(sc);

        /* Set up the contents of the general info and ring control blocks. */

        /* Set up the event ring and producer pointer. */
        rcb = &sc->ti_rdata->ti_info.ti_ev_rcb;

        TI_HOSTADDR(rcb->ti_hostaddr) = rdphys + TI_RD_OFF(ti_event_ring);
        rcb->ti_flags = 0;
        TI_HOSTADDR(sc->ti_rdata->ti_info.ti_ev_prodidx_ptr) =
            rdphys + TI_RD_OFF(ti_ev_prodidx_r);
        sc->ti_ev_prodidx.ti_idx = 0;
        CSR_WRITE_4(sc, TI_GCR_EVENTCONS_IDX, 0);
        sc->ti_ev_saved_considx = 0;

        /* Set up the command ring and producer mailbox. */
        rcb = &sc->ti_rdata->ti_info.ti_cmd_rcb;

        sc->ti_rdata->ti_cmd_ring =
            (struct ti_cmd_desc *)(sc->ti_vhandle + TI_GCR_CMDRING);
        TI_HOSTADDR(rcb->ti_hostaddr) = TI_GCR_NIC_ADDR(TI_GCR_CMDRING);
        rcb->ti_flags = 0;
        rcb->ti_max_len = 0;
        for (i = 0; i < TI_CMD_RING_CNT; i++) {
                CSR_WRITE_4(sc, TI_GCR_CMDRING + (i * 4), 0);
        }
        CSR_WRITE_4(sc, TI_GCR_CMDCONS_IDX, 0);
        CSR_WRITE_4(sc, TI_MB_CMDPROD_IDX, 0);
        sc->ti_cmd_saved_prodidx = 0;

        /*
         * Assign the address of the stats refresh buffer.
         * We re-use the current stats buffer for this to
         * conserve memory.
         */
        TI_HOSTADDR(sc->ti_rdata->ti_info.ti_refresh_stats_ptr) =
            rdphys + TI_RD_OFF(ti_info.ti_stats);

        /* Set up the standard receive ring. */
        rcb = &sc->ti_rdata->ti_info.ti_std_rx_rcb;
        TI_HOSTADDR(rcb->ti_hostaddr) = rdphys + TI_RD_OFF(ti_rx_std_ring);
        rcb->ti_max_len = TI_FRAMELEN;
        rcb->ti_flags = 0;
        if (sc->ti_ifp->if_hwassist)
                rcb->ti_flags |= TI_RCB_FLAG_TCP_UDP_CKSUM |
                     TI_RCB_FLAG_IP_CKSUM | TI_RCB_FLAG_NO_PHDR_CKSUM;
        rcb->ti_flags |= TI_RCB_FLAG_VLAN_ASSIST;

        /* Set up the jumbo receive ring. */
        rcb = &sc->ti_rdata->ti_info.ti_jumbo_rx_rcb;
        TI_HOSTADDR(rcb->ti_hostaddr) = rdphys + TI_RD_OFF(ti_rx_jumbo_ring);

#ifdef TI_PRIVATE_JUMBOS
        rcb->ti_max_len = TI_JUMBO_FRAMELEN;
        rcb->ti_flags = 0;
#else
        rcb->ti_max_len = PAGE_SIZE;
        rcb->ti_flags = TI_RCB_FLAG_USE_EXT_RX_BD;
#endif
        if (sc->ti_ifp->if_hwassist)
                rcb->ti_flags |= TI_RCB_FLAG_TCP_UDP_CKSUM |
                     TI_RCB_FLAG_IP_CKSUM | TI_RCB_FLAG_NO_PHDR_CKSUM;
        rcb->ti_flags |= TI_RCB_FLAG_VLAN_ASSIST;

        /*
         * Set up the mini ring. Only activated on the
         * Tigon 2 but the slot in the config block is
         * still there on the Tigon 1.
         */
        rcb = &sc->ti_rdata->ti_info.ti_mini_rx_rcb;
        TI_HOSTADDR(rcb->ti_hostaddr) = rdphys + TI_RD_OFF(ti_rx_mini_ring);
        rcb->ti_max_len = MHLEN - ETHER_ALIGN;
        if (sc->ti_hwrev == TI_HWREV_TIGON)
                rcb->ti_flags = TI_RCB_FLAG_RING_DISABLED;
        else
                rcb->ti_flags = 0;
        if (sc->ti_ifp->if_hwassist)
                rcb->ti_flags |= TI_RCB_FLAG_TCP_UDP_CKSUM |
                     TI_RCB_FLAG_IP_CKSUM | TI_RCB_FLAG_NO_PHDR_CKSUM;
        rcb->ti_flags |= TI_RCB_FLAG_VLAN_ASSIST;

        /*
         * Set up the receive return ring.
         */
        rcb = &sc->ti_rdata->ti_info.ti_return_rcb;
        TI_HOSTADDR(rcb->ti_hostaddr) = rdphys + TI_RD_OFF(ti_rx_return_ring);
        rcb->ti_flags = 0;
        rcb->ti_max_len = TI_RETURN_RING_CNT;
        TI_HOSTADDR(sc->ti_rdata->ti_info.ti_return_prodidx_ptr) =
            rdphys + TI_RD_OFF(ti_return_prodidx_r);

        /*
         * Set up the tx ring. Note: for the Tigon 2, we have the option
         * of putting the transmit ring in the host's address space and
         * letting the chip DMA it instead of leaving the ring in the NIC's
         * memory and accessing it through the shared memory region. We
         * do this for the Tigon 2, but it doesn't work on the Tigon 1,
         * so we have to revert to the shared memory scheme if we detect
         * a Tigon 1 chip.
         */
        CSR_WRITE_4(sc, TI_WINBASE, TI_TX_RING_BASE);
        if (sc->ti_hwrev == TI_HWREV_TIGON) {
                sc->ti_rdata->ti_tx_ring_nic =
                    (struct ti_tx_desc *)(sc->ti_vhandle + TI_WINDOW);
        }
        bzero((char *)sc->ti_rdata->ti_tx_ring,
            TI_TX_RING_CNT * sizeof(struct ti_tx_desc));
        rcb = &sc->ti_rdata->ti_info.ti_tx_rcb;
        if (sc->ti_hwrev == TI_HWREV_TIGON)
                rcb->ti_flags = 0;
        else
                rcb->ti_flags = TI_RCB_FLAG_HOST_RING;
        rcb->ti_flags |= TI_RCB_FLAG_VLAN_ASSIST;
        if (sc->ti_ifp->if_hwassist)
                rcb->ti_flags |= TI_RCB_FLAG_TCP_UDP_CKSUM |
                     TI_RCB_FLAG_IP_CKSUM | TI_RCB_FLAG_NO_PHDR_CKSUM;
        rcb->ti_max_len = TI_TX_RING_CNT;
        if (sc->ti_hwrev == TI_HWREV_TIGON)
                TI_HOSTADDR(rcb->ti_hostaddr) = TI_TX_RING_BASE;
        else
                TI_HOSTADDR(rcb->ti_hostaddr) = rdphys + TI_RD_OFF(ti_tx_ring);
        TI_HOSTADDR(sc->ti_rdata->ti_info.ti_tx_considx_ptr) =
            rdphys + TI_RD_OFF(ti_tx_considx_r);

        /* Set up tuneables */
#if 0
        if (ifp->if_mtu > (ETHERMTU + ETHER_HDR_LEN + ETHER_CRC_LEN))
                CSR_WRITE_4(sc, TI_GCR_RX_COAL_TICKS,
                    (sc->ti_rx_coal_ticks / 10));
        else
#endif
                CSR_WRITE_4(sc, TI_GCR_RX_COAL_TICKS, sc->ti_rx_coal_ticks);
        CSR_WRITE_4(sc, TI_GCR_TX_COAL_TICKS, sc->ti_tx_coal_ticks);
        CSR_WRITE_4(sc, TI_GCR_STAT_TICKS, sc->ti_stat_ticks);
        CSR_WRITE_4(sc, TI_GCR_RX_MAX_COAL_BD, sc->ti_rx_max_coal_bds);
        CSR_WRITE_4(sc, TI_GCR_TX_MAX_COAL_BD, sc->ti_tx_max_coal_bds);
        CSR_WRITE_4(sc, TI_GCR_TX_BUFFER_RATIO, sc->ti_tx_buf_ratio);

        /* Turn interrupts on. */
        CSR_WRITE_4(sc, TI_GCR_MASK_INTRS, 0);
        CSR_WRITE_4(sc, TI_MB_HOSTINTR, 0);

        /* Start CPU. */
        TI_CLRBIT(sc, TI_CPU_STATE, (TI_CPUSTATE_HALT|TI_CPUSTATE_STEP));

        return (0);
}

static void
ti_rdata_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
        struct ti_softc *sc;

        sc = arg;
        if (error || nseg != 1)
                return;

        /*
         * All of the Tigon data structures need to live at <4GB.  This
         * cast is fine since busdma was told about this constraint.
         */
        sc->ti_rdata_phys = (uint32_t)segs[0].ds_addr;
        return;
}
        
/*
 * Probe for a Tigon chip. Check the PCI vendor and device IDs
 * against our list and return its name if we find a match.
 */
static int
ti_probe(dev)
        device_t                dev;
{
        struct ti_type          *t;

        t = ti_devs;

        while (t->ti_name != NULL) {
                if ((pci_get_vendor(dev) == t->ti_vid) &&
                    (pci_get_device(dev) == t->ti_did)) {
                        device_set_desc(dev, t->ti_name);
                        return (BUS_PROBE_DEFAULT);
                }
                t++;
        }

        return (ENXIO);
}

static int
ti_attach(dev)
        device_t                dev;
{
        struct ifnet            *ifp;
        struct ti_softc         *sc;
        int                     error = 0, rid;
        u_char                  eaddr[6];

        sc = device_get_softc(dev);
        sc->ti_unit = device_get_unit(dev);

        mtx_init(&sc->ti_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
            MTX_DEF | MTX_RECURSE);
        ifmedia_init(&sc->ifmedia, IFM_IMASK, ti_ifmedia_upd, ti_ifmedia_sts);
        ifp = sc->ti_ifp = if_alloc(IFT_ETHER);
        if (ifp == NULL) {
                device_printf(dev, "can not if_alloc()\n");
                error = ENOSPC;
                goto fail;
        }
        sc->ti_ifp->if_capabilities = IFCAP_HWCSUM |
            IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU;
        sc->ti_ifp->if_capenable = sc->ti_ifp->if_capabilities;

        /*
         * Map control/status registers.
         */
        pci_enable_busmaster(dev);

        rid = TI_PCI_LOMEM;
        sc->ti_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
            RF_ACTIVE|PCI_RF_DENSE);

        if (sc->ti_res == NULL) {
                device_printf(dev, "couldn't map memory\n");
                error = ENXIO;
                goto fail;
        }

        sc->ti_btag = rman_get_bustag(sc->ti_res);
        sc->ti_bhandle = rman_get_bushandle(sc->ti_res);
        sc->ti_vhandle = (vm_offset_t)rman_get_virtual(sc->ti_res);

        /* Allocate interrupt */
        rid = 0;

        sc->ti_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
            RF_SHAREABLE | RF_ACTIVE);

        if (sc->ti_irq == NULL) {
                device_printf(dev, "couldn't map interrupt\n");
                error = ENXIO;
                goto fail;
        }

        if (ti_chipinit(sc)) {
                device_printf(dev, "chip initialization failed\n");
                error = ENXIO;
                goto fail;
        }

        /* Zero out the NIC's on-board SRAM. */
        ti_mem(sc, 0x2000, 0x100000 - 0x2000,  NULL);

        /* Init again -- zeroing memory may have clobbered some registers. */
        if (ti_chipinit(sc)) {
                device_printf(dev, "chip initialization failed\n");
                error = ENXIO;
                goto fail;
        }

        /*
         * Get station address from the EEPROM. Note: the manual states
         * that the MAC address is at offset 0x8c, however the data is
         * stored as two longwords (since that's how it's loaded into
         * the NIC). This means the MAC address is actually preceded
         * by two zero bytes. We need to skip over those.
         */
        if (ti_read_eeprom(sc, eaddr,
                                TI_EE_MAC_OFFSET + 2, ETHER_ADDR_LEN)) {
                device_printf(dev, "failed to read station address\n");
                error = ENXIO;
                goto fail;
        }

        /* Allocate the general information block and ring buffers. */
        if (bus_dma_tag_create(NULL,                    /* parent */
                                1, 0,                   /* algnmnt, boundary */
                                BUS_SPACE_MAXADDR,      /* lowaddr */
                                BUS_SPACE_MAXADDR,      /* highaddr */
                                NULL, NULL,             /* filter, filterarg */
                                BUS_SPACE_MAXSIZE_32BIT,/* maxsize */
                                0,                      /* nsegments */
                                BUS_SPACE_MAXSIZE_32BIT,/* maxsegsize */
                                0,                      /* flags */
                                NULL, NULL,             /* lockfunc, lockarg */
                                &sc->ti_parent_dmat) != 0) {
                device_printf(dev, "Failed to allocate parent dmat\n");
                error = ENOMEM;
                goto fail;
        }

        if (bus_dma_tag_create(sc->ti_parent_dmat,      /* parent */
                                PAGE_SIZE, 0,           /* algnmnt, boundary */
                                BUS_SPACE_MAXADDR_32BIT,/* lowaddr */
                                BUS_SPACE_MAXADDR,      /* highaddr */
                                NULL, NULL,             /* filter, filterarg */
                                sizeof(struct ti_ring_data),    /* maxsize */
                                1,                      /* nsegments */
                                sizeof(struct ti_ring_data),    /* maxsegsize */
                                0,                      /* flags */
                                NULL, NULL,             /* lockfunc, lockarg */
                                &sc->ti_rdata_dmat) != 0) {
                device_printf(dev, "Failed to allocate rdata dmat\n");
                error = ENOMEM;
                goto fail;
        }

        if (bus_dmamem_alloc(sc->ti_rdata_dmat, (void**)&sc->ti_rdata,
                             BUS_DMA_NOWAIT, &sc->ti_rdata_dmamap) != 0) {
                device_printf(dev, "Failed to allocate rdata memory\n");
                error = ENOMEM;
                goto fail;
        }

        if (bus_dmamap_load(sc->ti_rdata_dmat, sc->ti_rdata_dmamap,
                            sc->ti_rdata, sizeof(struct ti_ring_data),
                            ti_rdata_cb, sc, BUS_DMA_NOWAIT) != 0) {
                device_printf(dev, "Failed to load rdata segments\n");
                error = ENOMEM;
                goto fail;
        }

        bzero(sc->ti_rdata, sizeof(struct ti_ring_data));

        /* Try to allocate memory for jumbo buffers. */
#ifdef TI_PRIVATE_JUMBOS
        if (ti_alloc_jumbo_mem(sc)) {
                device_printf(dev, "jumbo buffer allocation failed\n");
                error = ENXIO;
                goto fail;
        }
#endif

        /*
         * We really need a better way to tell a 1000baseTX card
         * from a 1000baseSX one, since in theory there could be
         * OEMed 1000baseTX cards from lame vendors who aren't
         * clever enough to change the PCI ID. For the moment
         * though, the AceNIC is the only copper card available.
         */
        if (pci_get_vendor(dev) == ALT_VENDORID &&
            pci_get_device(dev) == ALT_DEVICEID_ACENIC_COPPER)
                sc->ti_copper = 1;
        /* Ok, it's not the only copper card available. */
        if (pci_get_vendor(dev) == NG_VENDORID &&
            pci_get_device(dev) == NG_DEVICEID_GA620T)
                sc->ti_copper = 1;

        /* Set default tuneable values. */
        sc->ti_stat_ticks = 2 * TI_TICKS_PER_SEC;
#if 0
        sc->ti_rx_coal_ticks = TI_TICKS_PER_SEC / 5000;
#endif
        sc->ti_rx_coal_ticks = 170;
        sc->ti_tx_coal_ticks = TI_TICKS_PER_SEC / 500;
        sc->ti_rx_max_coal_bds = 64;
#if 0
        sc->ti_tx_max_coal_bds = 128;
#endif
        sc->ti_tx_max_coal_bds = 32;
        sc->ti_tx_buf_ratio = 21;

        /* Set up ifnet structure */
        ifp->if_softc = sc;
        if_initname(ifp, device_get_name(dev), device_get_unit(dev));
        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST |
            IFF_NEEDSGIANT;
        tis[sc->ti_unit] = sc;
        ifp->if_ioctl = ti_ioctl;
        ifp->if_start = ti_start;
        ifp->if_watchdog = ti_watchdog;
        ifp->if_init = ti_init;
        ifp->if_mtu = ETHERMTU;
        ifp->if_snd.ifq_maxlen = TI_TX_RING_CNT - 1;

        /* Set up ifmedia support. */
        if (sc->ti_copper) {
                /*
                 * Copper cards allow manual 10/100 mode selection,
                 * but not manual 1000baseTX mode selection. Why?
                 * Becuase currently there's no way to specify the
                 * master/slave setting through the firmware interface,
                 * so Alteon decided to just bag it and handle it
                 * via autonegotiation.
                 */
                ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_T, 0, NULL);
                ifmedia_add(&sc->ifmedia,
                    IFM_ETHER|IFM_10_T|IFM_FDX, 0, NULL);
                ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_TX, 0, NULL);
                ifmedia_add(&sc->ifmedia,
                    IFM_ETHER|IFM_100_TX|IFM_FDX, 0, NULL);
                ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_1000_T, 0, NULL);
                ifmedia_add(&sc->ifmedia,
                    IFM_ETHER|IFM_1000_T|IFM_FDX, 0, NULL);
        } else {
                /* Fiber cards don't support 10/100 modes. */
                ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_1000_SX, 0, NULL);
                ifmedia_add(&sc->ifmedia,
                    IFM_ETHER|IFM_1000_SX|IFM_FDX, 0, NULL);
        }
        ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_AUTO, 0, NULL);
        ifmedia_set(&sc->ifmedia, IFM_ETHER|IFM_AUTO);

        /*
         * We're assuming here that card initialization is a sequential
         * thing.  If it isn't, multiple cards probing at the same time
         * could stomp on the list of softcs here.
         */

        /* Register the device */
        sc->dev = make_dev(&ti_cdevsw, sc->ti_unit, UID_ROOT, GID_OPERATOR,
                           0600, "ti%d", sc->ti_unit);
        sc->dev->si_drv1 = sc;

        /*
         * Call MI attach routine.
         */
        ether_ifattach(ifp, eaddr);

        /* Hook interrupt last to avoid having to lock softc */
        error = bus_setup_intr(dev, sc->ti_irq, INTR_TYPE_NET,
           ti_intr, sc, &sc->ti_intrhand);

        if (error) {
                device_printf(dev, "couldn't set up irq\n");
                ether_ifdetach(ifp);
                goto fail;
        }

fail:
        if (sc && error)
                ti_detach(dev);

        return (error);
}

/*
 * Shutdown hardware and free up resources. This can be called any
 * time after the mutex has been initialized. It is called in both
 * the error case in attach and the normal detach case so it needs
 * to be careful about only freeing resources that have actually been
 * allocated.
 */
static int
ti_detach(dev)
        device_t                dev;
{
        struct ti_softc         *sc;
        struct ifnet            *ifp;

        sc = device_get_softc(dev);
        if (sc->dev)
                destroy_dev(sc->dev);
        KASSERT(mtx_initialized(&sc->ti_mtx), ("ti mutex not initialized"));
        TI_LOCK(sc);
        ifp = sc->ti_ifp;

        /* These should only be active if attach succeeded */
        if (device_is_attached(dev)) {
                ti_stop(sc);
                ether_ifdetach(ifp);
                bus_generic_detach(dev);
        }
        ifmedia_removeall(&sc->ifmedia);

        if (sc->ti_rdata)
                bus_dmamem_free(sc->ti_rdata_dmat, sc->ti_rdata,
                                sc->ti_rdata_dmamap);
        if (sc->ti_rdata_dmat)
                bus_dma_tag_destroy(sc->ti_rdata_dmat);
        if (sc->ti_parent_dmat)
                bus_dma_tag_destroy(sc->ti_parent_dmat);
        if (sc->ti_intrhand)
                bus_teardown_intr(dev, sc->ti_irq, sc->ti_intrhand);
        if (sc->ti_irq)
                bus_release_resource(dev, SYS_RES_IRQ, 0, sc->ti_irq);
        if (sc->ti_res) {
                bus_release_resource(dev, SYS_RES_MEMORY, TI_PCI_LOMEM,
                    sc->ti_res);
        }
        if (ifp)
                if_free(ifp);

#ifdef TI_PRIVATE_JUMBOS
        if (sc->ti_cdata.ti_jumbo_buf)
                contigfree(sc->ti_cdata.ti_jumbo_buf, TI_JMEM, M_DEVBUF);
#endif
        if (sc->ti_rdata)
                contigfree(sc->ti_rdata, sizeof(struct ti_ring_data), M_DEVBUF);

        TI_UNLOCK(sc);
        mtx_destroy(&sc->ti_mtx);

        return (0);
}

#ifdef TI_JUMBO_HDRSPLIT
/*
 * If hdr_len is 0, that means that header splitting wasn't done on
 * this packet for some reason.  The two most likely reasons are that
 * the protocol isn't a supported protocol for splitting, or this
 * packet had a fragment offset that wasn't 0.
 *
 * The header length, if it is non-zero, will always be the length of
 * the headers on the packet, but that length could be longer than the
 * first mbuf.  So we take the minimum of the two as the actual
 * length.
 */
static __inline void
ti_hdr_split(struct mbuf *top, int hdr_len, int pkt_len, int idx)
{
        int i = 0;
        int lengths[4] = {0, 0, 0, 0};
        struct mbuf *m, *mp;

        if (hdr_len != 0)
                top->m_len = min(hdr_len, top->m_len);
        pkt_len -= top->m_len;
        lengths[i++] = top->m_len;

        mp = top;
        for (m = top->m_next; m && pkt_len; m = m->m_next) {
                m->m_len = m->m_ext.ext_size = min(m->m_len, pkt_len);
                pkt_len -= m->m_len;
                lengths[i++] = m->m_len;
                mp = m;
        }

#if 0
        if (hdr_len != 0)
                printf("got split packet: ");
        else
                printf("got non-split packet: ");

        printf("%d,%d,%d,%d = %d\n", lengths[0],
            lengths[1], lengths[2], lengths[3],
            lengths[0] + lengths[1] + lengths[2] +
            lengths[3]);
#endif

        if (pkt_len)
                panic("header splitting didn't");

        if (m) {
                m_freem(m);
                mp->m_next = NULL;

        }
        if (mp->m_next != NULL)
                panic("ti_hdr_split: last mbuf in chain should be null");
}
#endif /* TI_JUMBO_HDRSPLIT */

/*
 * Frame reception handling. This is called if there's a frame
 * on the receive return list.
 *
 * Note: we have to be able to handle three possibilities here:
 * 1) the frame is from the mini receive ring (can only happen)
 *    on Tigon 2 boards)
 * 2) the frame is from the jumbo recieve ring
 * 3) the frame is from the standard receive ring
 */

static void
ti_rxeof(sc)
        struct ti_softc         *sc;
{
        struct ifnet            *ifp;
        struct ti_cmd_desc      cmd;

        TI_LOCK_ASSERT(sc);

        ifp = sc->ti_ifp;

        while (sc->ti_rx_saved_considx != sc->ti_return_prodidx.ti_idx) {
                struct ti_rx_desc       *cur_rx;
                u_int32_t               rxidx;
                struct mbuf             *m = NULL;
                u_int16_t               vlan_tag = 0;
                int                     have_tag = 0;

                cur_rx =
                    &sc->ti_rdata->ti_rx_return_ring[sc->ti_rx_saved_considx];
                rxidx = cur_rx->ti_idx;
                TI_INC(sc->ti_rx_saved_considx, TI_RETURN_RING_CNT);

                if (cur_rx->ti_flags & TI_BDFLAG_VLAN_TAG) {
                        have_tag = 1;
                        vlan_tag = cur_rx->ti_vlan_tag & 0xfff;
                }

                if (cur_rx->ti_flags & TI_BDFLAG_JUMBO_RING) {

                        TI_INC(sc->ti_jumbo, TI_JUMBO_RX_RING_CNT);
                        m = sc->ti_cdata.ti_rx_jumbo_chain[rxidx];
                        sc->ti_cdata.ti_rx_jumbo_chain[rxidx] = NULL;
                        if (cur_rx->ti_flags & TI_BDFLAG_ERROR) {
                                ifp->if_ierrors++;
                                ti_newbuf_jumbo(sc, sc->ti_jumbo, m);
                                continue;
                        }
                        if (ti_newbuf_jumbo(sc, sc->ti_jumbo, NULL) == ENOBUFS) {
                                ifp->if_ierrors++;
                                ti_newbuf_jumbo(sc, sc->ti_jumbo, m);
                                continue;
                        }
#ifdef TI_PRIVATE_JUMBOS
                        m->m_len = cur_rx->ti_len;
#else /* TI_PRIVATE_JUMBOS */
#ifdef TI_JUMBO_HDRSPLIT
                        if (sc->ti_hdrsplit)
                                ti_hdr_split(m, TI_HOSTADDR(cur_rx->ti_addr),
                                             cur_rx->ti_len, rxidx);
                        else
#endif /* TI_JUMBO_HDRSPLIT */
                        m_adj(m, cur_rx->ti_len - m->m_pkthdr.len);
#endif /* TI_PRIVATE_JUMBOS */
                } else if (cur_rx->ti_flags & TI_BDFLAG_MINI_RING) {
                        TI_INC(sc->ti_mini, TI_MINI_RX_RING_CNT);
                        m = sc->ti_cdata.ti_rx_mini_chain[rxidx];
                        sc->ti_cdata.ti_rx_mini_chain[rxidx] = NULL;
                        if (cur_rx->ti_flags & TI_BDFLAG_ERROR) {
                                ifp->if_ierrors++;
                                ti_newbuf_mini(sc, sc->ti_mini, m);
                                continue;
                        }
                        if (ti_newbuf_mini(sc, sc->ti_mini, NULL) == ENOBUFS) {
                                ifp->if_ierrors++;
                                ti_newbuf_mini(sc, sc->ti_mini, m);
                                continue;
                        }
                        m->m_len = cur_rx->ti_len;
                } else {
                        TI_INC(sc->ti_std, TI_STD_RX_RING_CNT);
                        m = sc->ti_cdata.ti_rx_std_chain[rxidx];
                        sc->ti_cdata.ti_rx_std_chain[rxidx] = NULL;
                        if (cur_rx->ti_flags & TI_BDFLAG_ERROR) {
                                ifp->if_ierrors++;
                                ti_newbuf_std(sc, sc->ti_std, m);
                                continue;
                        }
                        if (ti_newbuf_std(sc, sc->ti_std, NULL) == ENOBUFS) {
                                ifp->if_ierrors++;
                                ti_newbuf_std(sc, sc->ti_std, m);
                                continue;
                        }
                        m->m_len = cur_rx->ti_len;
                }

                m->m_pkthdr.len = cur_rx->ti_len;
                ifp->if_ipackets++;
                m->m_pkthdr.rcvif = ifp;

                if (ifp->if_hwassist) {
                        m->m_pkthdr.csum_flags |= CSUM_IP_CHECKED |
                            CSUM_DATA_VALID;
                        if ((cur_rx->ti_ip_cksum ^ 0xffff) == 0)
                                m->m_pkthdr.csum_flags |= CSUM_IP_VALID;
                        m->m_pkthdr.csum_data = cur_rx->ti_tcp_udp_cksum;
                }

                /*
                 * If we received a packet with a vlan tag,
                 * tag it before passing the packet upward.
                 */
                if (have_tag)
                        VLAN_INPUT_TAG(ifp, m, vlan_tag, continue);
                TI_UNLOCK(sc);
                (*ifp->if_input)(ifp, m);
                TI_LOCK(sc);
        }

        /* Only necessary on the Tigon 1. */
        if (sc->ti_hwrev == TI_HWREV_TIGON)
                CSR_WRITE_4(sc, TI_GCR_RXRETURNCONS_IDX,
                    sc->ti_rx_saved_considx);

        TI_UPDATE_STDPROD(sc, sc->ti_std);
        TI_UPDATE_MINIPROD(sc, sc->ti_mini);
        TI_UPDATE_JUMBOPROD(sc, sc->ti_jumbo);
}

static void
ti_txeof(sc)
        struct ti_softc         *sc;
{
        struct ti_tx_desc       *cur_tx = NULL;
        struct ifnet            *ifp;

        ifp = sc->ti_ifp;

        /*
         * Go through our tx ring and free mbufs for those
         * frames that have been sent.
         */
        while (sc->ti_tx_saved_considx != sc->ti_tx_considx.ti_idx) {
                u_int32_t               idx = 0;

                idx = sc->ti_tx_saved_considx;
                if (sc->ti_hwrev == TI_HWREV_TIGON) {
                        if (idx > 383)
                                CSR_WRITE_4(sc, TI_WINBASE,
                                    TI_TX_RING_BASE + 6144);
                        else if (idx > 255)
                                CSR_WRITE_4(sc, TI_WINBASE,
                                    TI_TX_RING_BASE + 4096);
                        else if (idx > 127)
                                CSR_WRITE_4(sc, TI_WINBASE,
                                    TI_TX_RING_BASE + 2048);
                        else
                                CSR_WRITE_4(sc, TI_WINBASE,
                                    TI_TX_RING_BASE);
                        cur_tx = &sc->ti_rdata->ti_tx_ring_nic[idx % 128];
                } else
                        cur_tx = &sc->ti_rdata->ti_tx_ring[idx];
                if (cur_tx->ti_flags & TI_BDFLAG_END)
                        ifp->if_opackets++;
                if (sc->ti_cdata.ti_tx_chain[idx] != NULL) {
                        m_freem(sc->ti_cdata.ti_tx_chain[idx]);
                        sc->ti_cdata.ti_tx_chain[idx] = NULL;
                }
                sc->ti_txcnt--;
                TI_INC(sc->ti_tx_saved_considx, TI_TX_RING_CNT);
                ifp->if_timer = 0;
        }

        if (cur_tx != NULL)
                ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
}

static void
ti_intr(xsc)
        void                    *xsc;
{
        struct ti_softc         *sc;
        struct ifnet            *ifp;

        sc = xsc;
        TI_LOCK(sc);
        ifp = sc->ti_ifp;

/*#ifdef notdef*/
        /* Avoid this for now -- checking this register is expensive. */
        /* Make sure this is really our interrupt. */
        if (!(CSR_READ_4(sc, TI_MISC_HOST_CTL) & TI_MHC_INTSTATE)) {
                TI_UNLOCK(sc);
                return;
        }
/*#endif*/

        /* Ack interrupt and stop others from occuring. */
        CSR_WRITE_4(sc, TI_MB_HOSTINTR, 1);

        if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
                /* Check RX return ring producer/consumer */
                ti_rxeof(sc);

                /* Check TX ring producer/consumer */
                ti_txeof(sc);
        }

        ti_handle_events(sc);

        /* Re-enable interrupts. */
        CSR_WRITE_4(sc, TI_MB_HOSTINTR, 0);

        if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
            ifp->if_snd.ifq_head != NULL)
                ti_start(ifp);

        TI_UNLOCK(sc);
}

static void
ti_stats_update(sc)
        struct ti_softc         *sc;
{
        struct ifnet            *ifp;

        ifp = sc->ti_ifp;

        ifp->if_collisions +=
           (sc->ti_rdata->ti_info.ti_stats.dot3StatsSingleCollisionFrames +
           sc->ti_rdata->ti_info.ti_stats.dot3StatsMultipleCollisionFrames +
           sc->ti_rdata->ti_info.ti_stats.dot3StatsExcessiveCollisions +
           sc->ti_rdata->ti_info.ti_stats.dot3StatsLateCollisions) -
           ifp->if_collisions;
}

/*
 * Encapsulate an mbuf chain in the tx ring  by coupling the mbuf data
 * pointers to descriptors.
 */
static int
ti_encap(sc, m_head, txidx)
        struct ti_softc         *sc;
        struct mbuf             *m_head;
        u_int32_t               *txidx;
{
        struct ti_tx_desc       *f = NULL;
        struct mbuf             *m;
        u_int32_t               frag, cur, cnt = 0;
        u_int16_t               csum_flags = 0;
        struct m_tag            *mtag;

        m = m_head;
        cur = frag = *txidx;

        if (m_head->m_pkthdr.csum_flags) {
                if (m_head->m_pkthdr.csum_flags & CSUM_IP)
                        csum_flags |= TI_BDFLAG_IP_CKSUM;
                if (m_head->m_pkthdr.csum_flags & (CSUM_TCP | CSUM_UDP))
                        csum_flags |= TI_BDFLAG_TCP_UDP_CKSUM;
                if (m_head->m_flags & M_LASTFRAG)
                        csum_flags |= TI_BDFLAG_IP_FRAG_END;
                else if (m_head->m_flags & M_FRAG)
                        csum_flags |= TI_BDFLAG_IP_FRAG;
        }

        mtag = VLAN_OUTPUT_TAG(sc->ti_ifp, m);

        /*
         * Start packing the mbufs in this chain into
         * the fragment pointers. Stop when we run out
         * of fragments or hit the end of the mbuf chain.
         */
        for (m = m_head; m != NULL; m = m->m_next) {
                if (m->m_len != 0) {
                        if (sc->ti_hwrev == TI_HWREV_TIGON) {
                                if (frag > 383)
                                        CSR_WRITE_4(sc, TI_WINBASE,
                                            TI_TX_RING_BASE + 6144);
                                else if (frag > 255)
                                        CSR_WRITE_4(sc, TI_WINBASE,
                                            TI_TX_RING_BASE + 4096);
                                else if (frag > 127)
                                        CSR_WRITE_4(sc, TI_WINBASE,
                                            TI_TX_RING_BASE + 2048);
                                else
                                        CSR_WRITE_4(sc, TI_WINBASE,
                                            TI_TX_RING_BASE);
                                f = &sc->ti_rdata->ti_tx_ring_nic[frag % 128];
                        } else
                                f = &sc->ti_rdata->ti_tx_ring[frag];
                        if (sc->ti_cdata.ti_tx_chain[frag] != NULL)
                                break;
                        TI_HOSTADDR(f->ti_addr) = vtophys(mtod(m, vm_offset_t));
                        f->ti_len = m->m_len;
                        f->ti_flags = csum_flags;

                        if (mtag != NULL) {
                                f->ti_flags |= TI_BDFLAG_VLAN_TAG;
                                f->ti_vlan_tag = VLAN_TAG_VALUE(mtag) & 0xfff;
                        } else {
                                f->ti_vlan_tag = 0;
                        }

                        /*
                         * Sanity check: avoid coming within 16 descriptors
                         * of the end of the ring.
                         */
                        if ((TI_TX_RING_CNT - (sc->ti_txcnt + cnt)) < 16)
                                return (ENOBUFS);
                        cur = frag;
                        TI_INC(frag, TI_TX_RING_CNT);
                        cnt++;
                }
        }

        if (m != NULL)
                return (ENOBUFS);

        if (frag == sc->ti_tx_saved_considx)
                return (ENOBUFS);

        if (sc->ti_hwrev == TI_HWREV_TIGON)
                sc->ti_rdata->ti_tx_ring_nic[cur % 128].ti_flags |=
                    TI_BDFLAG_END;
        else
                sc->ti_rdata->ti_tx_ring[cur].ti_flags |= TI_BDFLAG_END;
        sc->ti_cdata.ti_tx_chain[cur] = m_head;
        sc->ti_txcnt += cnt;

        *txidx = frag;

        return (0);
}

/*
 * Main transmit routine. To avoid having to do mbuf copies, we put pointers
 * to the mbuf data regions directly in the transmit descriptors.
 */
static void
ti_start(ifp)
        struct ifnet            *ifp;
{
        struct ti_softc         *sc;
        struct mbuf             *m_head = NULL;
        u_int32_t               prodidx = 0;

        sc = ifp->if_softc;
        TI_LOCK(sc);

        prodidx = CSR_READ_4(sc, TI_MB_SENDPROD_IDX);

        while (sc->ti_cdata.ti_tx_chain[prodidx] == NULL) {
                IF_DEQUEUE(&ifp->if_snd, m_head);
                if (m_head == NULL)
                        break;

                /*
                 * XXX
                 * safety overkill.  If this is a fragmented packet chain
                 * with delayed TCP/UDP checksums, then only encapsulate
                 * it if we have enough descriptors to handle the entire
                 * chain at once.
                 * (paranoia -- may not actually be needed)
                 */
                if (m_head->m_flags & M_FIRSTFRAG &&
                    m_head->m_pkthdr.csum_flags & (CSUM_DELAY_DATA)) {
                        if ((TI_TX_RING_CNT - sc->ti_txcnt) <
                            m_head->m_pkthdr.csum_data + 16) {
                                IF_PREPEND(&ifp->if_snd, m_head);
                                ifp->if_drv_flags |= IFF_DRV_OACTIVE;
                                break;
                        }
                }

                /*
                 * Pack the data into the transmit ring. If we
                 * don't have room, set the OACTIVE flag and wait
                 * for the NIC to drain the ring.
                 */
                if (ti_encap(sc, m_head, &prodidx)) {
                        IF_PREPEND(&ifp->if_snd, m_head);
                        ifp->if_drv_flags |= IFF_DRV_OACTIVE;
                        break;
                }

                /*
                 * If there's a BPF listener, bounce a copy of this frame
                 * to him.
                 */
                BPF_MTAP(ifp, m_head);
        }

        /* Transmit */
        CSR_WRITE_4(sc, TI_MB_SENDPROD_IDX, prodidx);

        /*
         * Set a timeout in case the chip goes out to lunch.
         */
        ifp->if_timer = 5;
        TI_UNLOCK(sc);
}

static void
ti_init(xsc)
        void                    *xsc;
{
        struct ti_softc         *sc = xsc;

        /* Cancel pending I/O and flush buffers. */
        ti_stop(sc);

        TI_LOCK(sc);
        /* Init the gen info block, ring control blocks and firmware. */
        if (ti_gibinit(sc)) {
                if_printf(sc->ti_ifp, "initialization failure\n");
                TI_UNLOCK(sc);
                return;
        }

        TI_UNLOCK(sc);
}

static void ti_init2(sc)
        struct ti_softc         *sc;
{
        struct ti_cmd_desc      cmd;
        struct ifnet            *ifp;
        u_int16_t               *m;
        struct ifmedia          *ifm;
        int                     tmp;

        ifp = sc->ti_ifp;

        /* Specify MTU and interface index. */
        CSR_WRITE_4(sc, TI_GCR_IFINDEX, sc->ti_unit);
        CSR_WRITE_4(sc, TI_GCR_IFMTU, ifp->if_mtu +
            ETHER_HDR_LEN + ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN);
        TI_DO_CMD(TI_CMD_UPDATE_GENCOM, 0, 0);

        /* Load our MAC address. */
        m = (u_int16_t *)IF_LLADDR(sc->ti_ifp);
        CSR_WRITE_4(sc, TI_GCR_PAR0, htons(m[0]));
        CSR_WRITE_4(sc, TI_GCR_PAR1, (htons(m[1]) << 16) | htons(m[2]));
        TI_DO_CMD(TI_CMD_SET_MAC_ADDR, 0, 0);

        /* Enable or disable promiscuous mode as needed. */
        if (ifp->if_flags & IFF_PROMISC) {
                TI_DO_CMD(TI_CMD_SET_PROMISC_MODE, TI_CMD_CODE_PROMISC_ENB, 0);
        } else {
                TI_DO_CMD(TI_CMD_SET_PROMISC_MODE, TI_CMD_CODE_PROMISC_DIS, 0);
        }

        /* Program multicast filter. */
        ti_setmulti(sc);

        /*
         * If this is a Tigon 1, we should tell the
         * firmware to use software packet filtering.
         */
        if (sc->ti_hwrev == TI_HWREV_TIGON) {
                TI_DO_CMD(TI_CMD_FDR_FILTERING, TI_CMD_CODE_FILT_ENB, 0);
        }

        /* Init RX ring. */
        ti_init_rx_ring_std(sc);

        /* Init jumbo RX ring. */
        if (ifp->if_mtu > (ETHERMTU + ETHER_HDR_LEN + ETHER_CRC_LEN))
                ti_init_rx_ring_jumbo(sc);

        /*
         * If this is a Tigon 2, we can also configure the
         * mini ring.
         */
        if (sc->ti_hwrev == TI_HWREV_TIGON_II)
                ti_init_rx_ring_mini(sc);

        CSR_WRITE_4(sc, TI_GCR_RXRETURNCONS_IDX, 0);
        sc->ti_rx_saved_considx = 0;

        /* Init TX ring. */
        ti_init_tx_ring(sc);

        /* Tell firmware we're alive. */
        TI_DO_CMD(TI_CMD_HOST_STATE, TI_CMD_CODE_STACK_UP, 0);

        /* Enable host interrupts. */
        CSR_WRITE_4(sc, TI_MB_HOSTINTR, 0);

        ifp->if_drv_flags |= IFF_DRV_RUNNING;
        ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;

        /*
         * Make sure to set media properly. We have to do this
         * here since we have to issue commands in order to set
         * the link negotiation and we can't issue commands until
         * the firmware is running.
         */
        ifm = &sc->ifmedia;
        tmp = ifm->ifm_media;
        ifm->ifm_media = ifm->ifm_cur->ifm_media;
        ti_ifmedia_upd(ifp);
        ifm->ifm_media = tmp;
}

/*
 * Set media options.
 */
static int
ti_ifmedia_upd(ifp)
        struct ifnet            *ifp;
{
        struct ti_softc         *sc;
        struct ifmedia          *ifm;
        struct ti_cmd_desc      cmd;
        u_int32_t               flowctl;

        sc = ifp->if_softc;
        ifm = &sc->ifmedia;

        if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
                return (EINVAL);

        flowctl = 0;

        switch (IFM_SUBTYPE(ifm->ifm_media)) {
        case IFM_AUTO:
                /*
                 * Transmit flow control doesn't work on the Tigon 1.
                 */
                flowctl = TI_GLNK_RX_FLOWCTL_Y;

                /*
                 * Transmit flow control can also cause problems on the
                 * Tigon 2, apparantly with both the copper and fiber
                 * boards.  The symptom is that the interface will just
                 * hang.  This was reproduced with Alteon 180 switches.
                 */
#if 0
                if (sc->ti_hwrev != TI_HWREV_TIGON)
                        flowctl |= TI_GLNK_TX_FLOWCTL_Y;
#endif

                CSR_WRITE_4(sc, TI_GCR_GLINK, TI_GLNK_PREF|TI_GLNK_1000MB|
                    TI_GLNK_FULL_DUPLEX| flowctl |
                    TI_GLNK_AUTONEGENB|TI_GLNK_ENB);

                flowctl = TI_LNK_RX_FLOWCTL_Y;
#if 0
                if (sc->ti_hwrev != TI_HWREV_TIGON)
                        flowctl |= TI_LNK_TX_FLOWCTL_Y;
#endif

                CSR_WRITE_4(sc, TI_GCR_LINK, TI_LNK_100MB|TI_LNK_10MB|
                    TI_LNK_FULL_DUPLEX|TI_LNK_HALF_DUPLEX| flowctl |
                    TI_LNK_AUTONEGENB|TI_LNK_ENB);
                TI_DO_CMD(TI_CMD_LINK_NEGOTIATION,
                    TI_CMD_CODE_NEGOTIATE_BOTH, 0);
                break;
        case IFM_1000_SX:
        case IFM_1000_T:
                flowctl = TI_GLNK_RX_FLOWCTL_Y;
#if 0
                if (sc->ti_hwrev != TI_HWREV_TIGON)
                        flowctl |= TI_GLNK_TX_FLOWCTL_Y;
#endif

                CSR_WRITE_4(sc, TI_GCR_GLINK, TI_GLNK_PREF|TI_GLNK_1000MB|
                    flowctl |TI_GLNK_ENB);
                CSR_WRITE_4(sc, TI_GCR_LINK, 0);
                if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX) {
                        TI_SETBIT(sc, TI_GCR_GLINK, TI_GLNK_FULL_DUPLEX);
                }
                TI_DO_CMD(TI_CMD_LINK_NEGOTIATION,
                    TI_CMD_CODE_NEGOTIATE_GIGABIT, 0);
                break;
        case IFM_100_FX:
        case IFM_10_FL:
        case IFM_100_TX:
        case IFM_10_T:
                flowctl = TI_LNK_RX_FLOWCTL_Y;
#if 0
                if (sc->ti_hwrev != TI_HWREV_TIGON)
                        flowctl |= TI_LNK_TX_FLOWCTL_Y;
#endif

                CSR_WRITE_4(sc, TI_GCR_GLINK, 0);
                CSR_WRITE_4(sc, TI_GCR_LINK, TI_LNK_ENB|TI_LNK_PREF|flowctl);
                if (IFM_SUBTYPE(ifm->ifm_media) == IFM_100_FX ||
                    IFM_SUBTYPE(ifm->ifm_media) == IFM_100_TX) {
                        TI_SETBIT(sc, TI_GCR_LINK, TI_LNK_100MB);
                } else {
                        TI_SETBIT(sc, TI_GCR_LINK, TI_LNK_10MB);
                }
                if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX) {
                        TI_SETBIT(sc, TI_GCR_LINK, TI_LNK_FULL_DUPLEX);
                } else {
                        TI_SETBIT(sc, TI_GCR_LINK, TI_LNK_HALF_DUPLEX);
                }
                TI_DO_CMD(TI_CMD_LINK_NEGOTIATION,
                    TI_CMD_CODE_NEGOTIATE_10_100, 0);
                break;
        }

        return (0);
}

/*
 * Report current media status.
 */
static void
ti_ifmedia_sts(ifp, ifmr)
        struct ifnet            *ifp;
        struct ifmediareq       *ifmr;
{
        struct ti_softc         *sc;
        u_int32_t               media = 0;

        sc = ifp->if_softc;

        ifmr->ifm_status = IFM_AVALID;
        ifmr->ifm_active = IFM_ETHER;

        if (sc->ti_linkstat == TI_EV_CODE_LINK_DOWN)
                return;

        ifmr->ifm_status |= IFM_ACTIVE;

        if (sc->ti_linkstat == TI_EV_CODE_GIG_LINK_UP) {
                media = CSR_READ_4(sc, TI_GCR_GLINK_STAT);
                if (sc->ti_copper)
                        ifmr->ifm_active |= IFM_1000_T;
                else
                        ifmr->ifm_active |= IFM_1000_SX;
                if (media & TI_GLNK_FULL_DUPLEX)
                        ifmr->ifm_active |= IFM_FDX;
                else
                        ifmr->ifm_active |= IFM_HDX;
        } else if (sc->ti_linkstat == TI_EV_CODE_LINK_UP) {
                media = CSR_READ_4(sc, TI_GCR_LINK_STAT);
                if (sc->ti_copper) {
                        if (media & TI_LNK_100MB)
                                ifmr->ifm_active |= IFM_100_TX;
                        if (media & TI_LNK_10MB)
                                ifmr->ifm_active |= IFM_10_T;
                } else {
                        if (media & TI_LNK_100MB)
                                ifmr->ifm_active |= IFM_100_FX;
                        if (media & TI_LNK_10MB)
                                ifmr->ifm_active |= IFM_10_FL;
                }
                if (media & TI_LNK_FULL_DUPLEX)
                        ifmr->ifm_active |= IFM_FDX;
                if (media & TI_LNK_HALF_DUPLEX)
                        ifmr->ifm_active |= IFM_HDX;
        }
}

static int
ti_ioctl(ifp, command, data)
        struct ifnet            *ifp;
        u_long                  command;
        caddr_t                 data;
{
        struct ti_softc         *sc = ifp->if_softc;
        struct ifreq            *ifr = (struct ifreq *) data;
        int                     mask, error = 0;
        struct ti_cmd_desc      cmd;

        TI_LOCK(sc);

        switch (command) {
        case SIOCSIFMTU:
                if (ifr->ifr_mtu > TI_JUMBO_MTU)
                        error = EINVAL;
                else {
                        ifp->if_mtu = ifr->ifr_mtu;
                        ti_init(sc);
                }
                break;
        case SIOCSIFFLAGS:
                if (ifp->if_flags & IFF_UP) {
                        /*
                         * If only the state of the PROMISC flag changed,
                         * then just use the 'set promisc mode' command
                         * instead of reinitializing the entire NIC. Doing
                         * a full re-init means reloading the firmware and
                         * waiting for it to start up, which may take a
                         * second or two.
                         */
                        if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
                            ifp->if_flags & IFF_PROMISC &&
                            !(sc->ti_if_flags & IFF_PROMISC)) {
                                TI_DO_CMD(TI_CMD_SET_PROMISC_MODE,
                                    TI_CMD_CODE_PROMISC_ENB, 0);
                        } else if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
                            !(ifp->if_flags & IFF_PROMISC) &&
                            sc->ti_if_flags & IFF_PROMISC) {
                                TI_DO_CMD(TI_CMD_SET_PROMISC_MODE,
                                    TI_CMD_CODE_PROMISC_DIS, 0);
                        } else
                                ti_init(sc);
                } else {
                        if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
                                ti_stop(sc);
                        }
                }
                sc->ti_if_flags = ifp->if_flags;
                error = 0;
                break;
        case SIOCADDMULTI:
        case SIOCDELMULTI:
                if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
                        ti_setmulti(sc);
                        error = 0;
                }
                break;
        case SIOCSIFMEDIA:
        case SIOCGIFMEDIA:
                error = ifmedia_ioctl(ifp, ifr, &sc->ifmedia, command);
                break;
        case SIOCSIFCAP:
                mask = ifr->ifr_reqcap ^ ifp->if_capenable;
                if (mask & IFCAP_HWCSUM) {
                        if (IFCAP_HWCSUM & ifp->if_capenable)
                                ifp->if_capenable &= ~IFCAP_HWCSUM;
                        else
                                ifp->if_capenable |= IFCAP_HWCSUM;
                        if (ifp->if_drv_flags & IFF_DRV_RUNNING)
                                ti_init(sc);
                }
                error = 0;
                break;
        default:
                error = ether_ioctl(ifp, command, data);
                break;
        }

        TI_UNLOCK(sc);

        return (error);
}

static int
ti_open(struct cdev *dev, int flags, int fmt, struct thread *td)
{
        struct ti_softc *sc;

        sc = dev->si_drv1;
        if (sc == NULL)
                return (ENODEV);

        TI_LOCK(sc);
        sc->ti_flags |= TI_FLAG_DEBUGING;
        TI_UNLOCK(sc);

        return (0);
}

static int
ti_close(struct cdev *dev, int flag, int fmt, struct thread *td)
{
        struct ti_softc *sc;

        sc = dev->si_drv1;
        if (sc == NULL)
                return (ENODEV);

        TI_LOCK(sc);
        sc->ti_flags &= ~TI_FLAG_DEBUGING;
        TI_UNLOCK(sc);

        return (0);
}

/*
 * This ioctl routine goes along with the Tigon character device.
 */
static int
ti_ioctl2(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
    struct thread *td)
{
        int error;
        struct ti_softc *sc;

        sc = dev->si_drv1;
        if (sc == NULL)
                return (ENODEV);

        error = 0;

        switch (cmd) {
        case TIIOCGETSTATS:
        {
                struct ti_stats *outstats;

                outstats = (struct ti_stats *)addr;

                bcopy(&sc->ti_rdata->ti_info.ti_stats, outstats,
                      sizeof(struct ti_stats));
                break;
        }
        case TIIOCGETPARAMS:
        {
                struct ti_params        *params;

                params = (struct ti_params *)addr;

                params->ti_stat_ticks = sc->ti_stat_ticks;
                params->ti_rx_coal_ticks = sc->ti_rx_coal_ticks;
                params->ti_tx_coal_ticks = sc->ti_tx_coal_ticks;
                params->ti_rx_max_coal_bds = sc->ti_rx_max_coal_bds;
                params->ti_tx_max_coal_bds = sc->ti_tx_max_coal_bds;
                params->ti_tx_buf_ratio = sc->ti_tx_buf_ratio;
                params->param_mask = TI_PARAM_ALL;

                error = 0;

                break;
        }
        case TIIOCSETPARAMS:
        {
                struct ti_params *params;

                params = (struct ti_params *)addr;

                if (params->param_mask & TI_PARAM_STAT_TICKS) {
                        sc->ti_stat_ticks = params->ti_stat_ticks;
                        CSR_WRITE_4(sc, TI_GCR_STAT_TICKS, sc->ti_stat_ticks);
                }

                if (params->param_mask & TI_PARAM_RX_COAL_TICKS) {
                        sc->ti_rx_coal_ticks = params->ti_rx_coal_ticks;
                        CSR_WRITE_4(sc, TI_GCR_RX_COAL_TICKS,
                                    sc->ti_rx_coal_ticks);
                }

                if (params->param_mask & TI_PARAM_TX_COAL_TICKS) {
                        sc->ti_tx_coal_ticks = params->ti_tx_coal_ticks;
                        CSR_WRITE_4(sc, TI_GCR_TX_COAL_TICKS,
                                    sc->ti_tx_coal_ticks);
                }

                if (params->param_mask & TI_PARAM_RX_COAL_BDS) {
                        sc->ti_rx_max_coal_bds = params->ti_rx_max_coal_bds;
                        CSR_WRITE_4(sc, TI_GCR_RX_MAX_COAL_BD,
                                    sc->ti_rx_max_coal_bds);
                }

                if (params->param_mask & TI_PARAM_TX_COAL_BDS) {
                        sc->ti_tx_max_coal_bds = params->ti_tx_max_coal_bds;
                        CSR_WRITE_4(sc, TI_GCR_TX_MAX_COAL_BD,
                                    sc->ti_tx_max_coal_bds);
                }

                if (params->param_mask & TI_PARAM_TX_BUF_RATIO) {
                        sc->ti_tx_buf_ratio = params->ti_tx_buf_ratio;
                        CSR_WRITE_4(sc, TI_GCR_TX_BUFFER_RATIO,
                                    sc->ti_tx_buf_ratio);
                }

                error = 0;

                break;
        }
        case TIIOCSETTRACE: {
                ti_trace_type   trace_type;

                trace_type = *(ti_trace_type *)addr;

                /*
                 * Set tracing to whatever the user asked for.  Setting
                 * this register to 0 should have the effect of disabling
                 * tracing.
                 */
                CSR_WRITE_4(sc, TI_GCR_NIC_TRACING, trace_type);

                error = 0;

                break;
        }
        case TIIOCGETTRACE: {
                struct ti_trace_buf     *trace_buf;
                u_int32_t               trace_start, cur_trace_ptr, trace_len;

                trace_buf = (struct ti_trace_buf *)addr;

                trace_start = CSR_READ_4(sc, TI_GCR_NICTRACE_START);
                cur_trace_ptr = CSR_READ_4(sc, TI_GCR_NICTRACE_PTR);
                trace_len = CSR_READ_4(sc, TI_GCR_NICTRACE_LEN);

#if 0
                if_printf(sc->ti_ifp, "trace_start = %#x, cur_trace_ptr = %#x, "
                       "trace_len = %d\n", trace_start,
                       cur_trace_ptr, trace_len);
                if_printf(sc->ti_ifp, "trace_buf->buf_len = %d\n",
                       trace_buf->buf_len);
#endif

                error = ti_copy_mem(sc, trace_start, min(trace_len,
                                    trace_buf->buf_len),
                                    (caddr_t)trace_buf->buf, 1, 1);

                if (error == 0) {
                        trace_buf->fill_len = min(trace_len,
                                                  trace_buf->buf_len);
                        if (cur_trace_ptr < trace_start)
                                trace_buf->cur_trace_ptr =
                                        trace_start - cur_trace_ptr;
                        else
                                trace_buf->cur_trace_ptr =
                                        cur_trace_ptr - trace_start;
                } else
                        trace_buf->fill_len = 0;

                break;
        }

        /*
         * For debugging, five ioctls are needed:
         * ALT_ATTACH
         * ALT_READ_TG_REG
         * ALT_WRITE_TG_REG
         * ALT_READ_TG_MEM
         * ALT_WRITE_TG_MEM
         */
        case ALT_ATTACH:
                /*
                 * From what I can tell, Alteon's Solaris Tigon driver
                 * only has one character device, so you have to attach
                 * to the Tigon board you're interested in.  This seems
                 * like a not-so-good way to do things, since unless you
                 * subsequently specify the unit number of the device
                 * you're interested in in every ioctl, you'll only be
                 * able to debug one board at a time.
                 */
                error = 0;
                break;
        case ALT_READ_TG_MEM:
        case ALT_WRITE_TG_MEM:
        {
                struct tg_mem *mem_param;
                u_int32_t sram_end, scratch_end;

                mem_param = (struct tg_mem *)addr;

                if (sc->ti_hwrev == TI_HWREV_TIGON) {
                        sram_end = TI_END_SRAM_I;
                        scratch_end = TI_END_SCRATCH_I;
                } else {
                        sram_end = TI_END_SRAM_II;
                        scratch_end = TI_END_SCRATCH_II;
                }

                /*
                 * For now, we'll only handle accessing regular SRAM,
                 * nothing else.
                 */
                if ((mem_param->tgAddr >= TI_BEG_SRAM)
                 && ((mem_param->tgAddr + mem_param->len) <= sram_end)) {
                        /*
                         * In this instance, we always copy to/from user
                         * space, so the user space argument is set to 1.
                         */
                        error = ti_copy_mem(sc, mem_param->tgAddr,
                                            mem_param->len,
                                            mem_param->userAddr, 1,
                                            (cmd == ALT_READ_TG_MEM) ? 1 : 0);
                } else if ((mem_param->tgAddr >= TI_BEG_SCRATCH)
                        && (mem_param->tgAddr <= scratch_end)) {
                        error = ti_copy_scratch(sc, mem_param->tgAddr,
                                                mem_param->len,
                                                mem_param->userAddr, 1,
                                                (cmd == ALT_READ_TG_MEM) ?
                                                1 : 0, TI_PROCESSOR_A);
                } else if ((mem_param->tgAddr >= TI_BEG_SCRATCH_B_DEBUG)
                        && (mem_param->tgAddr <= TI_BEG_SCRATCH_B_DEBUG)) {
                        if (sc->ti_hwrev == TI_HWREV_TIGON) {
                                if_printf(sc->ti_ifp,
                                    "invalid memory range for Tigon I\n");
                                error = EINVAL;
                                break;
                        }
                        error = ti_copy_scratch(sc, mem_param->tgAddr -
                                                TI_SCRATCH_DEBUG_OFF,
                                                mem_param->len,
                                                mem_param->userAddr, 1,
                                                (cmd == ALT_READ_TG_MEM) ?
                                                1 : 0, TI_PROCESSOR_B);
                } else {
                        if_printf(sc->ti_ifp, "memory address %#x len %d is "
                                "out of supported range\n",
                                mem_param->tgAddr, mem_param->len);
                        error = EINVAL;
                }

                break;
        }
        case ALT_READ_TG_REG:
        case ALT_WRITE_TG_REG:
        {
                struct tg_reg   *regs;
                u_int32_t       tmpval;

                regs = (struct tg_reg *)addr;

                /*
                 * Make sure the address in question isn't out of range.
                 */
                if (regs->addr > TI_REG_MAX) {
                        error = EINVAL;
                        break;
                }
                if (cmd == ALT_READ_TG_REG) {
                        bus_space_read_region_4(sc->ti_btag, sc->ti_bhandle,
                                                regs->addr, &tmpval, 1);
                        regs->data = ntohl(tmpval);
#if 0
                        if ((regs->addr == TI_CPU_STATE)
                         || (regs->addr == TI_CPU_CTL_B)) {
                                if_printf(sc->ti_ifp, "register %#x = %#x\n",
                                       regs->addr, tmpval);
                        }
#endif
                } else {
                        tmpval = htonl(regs->data);
                        bus_space_write_region_4(sc->ti_btag, sc->ti_bhandle,
                                                 regs->addr, &tmpval, 1);
                }

                break;
        }
        default:
                error = ENOTTY;
                break;
        }
        return (error);
}

static void
ti_watchdog(ifp)
        struct ifnet            *ifp;
{
        struct ti_softc         *sc;

        sc = ifp->if_softc;
        TI_LOCK(sc);

        /*
         * When we're debugging, the chip is often stopped for long periods
         * of time, and that would normally cause the watchdog timer to fire.
         * Since that impedes debugging, we don't want to do that.
         */
        if (sc->ti_flags & TI_FLAG_DEBUGING) {
                TI_UNLOCK(sc);
                return;
        }

        if_printf(ifp, "watchdog timeout -- resetting\n");
        ti_stop(sc);
        ti_init(sc);

        ifp->if_oerrors++;
        TI_UNLOCK(sc);
}

/*
 * Stop the adapter and free any mbufs allocated to the
 * RX and TX lists.
 */
static void
ti_stop(sc)
        struct ti_softc         *sc;
{
        struct ifnet            *ifp;
        struct ti_cmd_desc      cmd;

        TI_LOCK(sc);

        ifp = sc->ti_ifp;

        /* Disable host interrupts. */
        CSR_WRITE_4(sc, TI_MB_HOSTINTR, 1);
        /*
         * Tell firmware we're shutting down.
         */
        TI_DO_CMD(TI_CMD_HOST_STATE, TI_CMD_CODE_STACK_DOWN, 0);

        /* Halt and reinitialize. */
        ti_chipinit(sc);
        ti_mem(sc, 0x2000, 0x100000 - 0x2000, NULL);
        ti_chipinit(sc);

        /* Free the RX lists. */
        ti_free_rx_ring_std(sc);

        /* Free jumbo RX list. */
        ti_free_rx_ring_jumbo(sc);

        /* Free mini RX list. */
        ti_free_rx_ring_mini(sc);

        /* Free TX buffers. */
        ti_free_tx_ring(sc);

        sc->ti_ev_prodidx.ti_idx = 0;
        sc->ti_return_prodidx.ti_idx = 0;
        sc->ti_tx_considx.ti_idx = 0;
        sc->ti_tx_saved_considx = TI_TXCONS_UNSET;

        ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
        TI_UNLOCK(sc);
}

/*
 * Stop all chip I/O so that the kernel's probe routines don't
 * get confused by errant DMAs when rebooting.
 */
static void
ti_shutdown(dev)
        device_t                dev;
{
        struct ti_softc         *sc;

        sc = device_get_softc(dev);
        TI_LOCK(sc);
        ti_chipinit(sc);
        TI_UNLOCK(sc);
}