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/*

 * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.

 *

 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/types.h>

#include <linux/interrupt.h>

#include <linux/ioport.h>

#include <linux/socket.h>

#include <linux/in.h>

#include <linux/route.h>

#include <linux/slab.h>

#include <linux/string.h>

#include <linux/delay.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/skbuff.h>

#include <asm/byteorder.h>

#include <asm/io.h>

#include <asm/system.h>

#include <asm/bitops.h>

#include <asm/page.h>

#include <asm/pgtable.h>

#include <asm/sgi/hpc3.h>

#include <asm/sgi/ip22.h>

#include <asm/sgialib.h>

#include "sgiseeq.h"

static char *version = "sgiseeq.c: David S. Miller (dm@engr.sgi.com)\n";

static char *sgiseeqstr = "SGI Seeq8003";

/*

 * If you want speed, you do something silly, it always has worked for me.  So,

 * with that in mind, I've decided to make this driver look completely like a

 * stupid Lance from a driver architecture perspective.  Only difference is that

 * here our "ring buffer" looks and acts like a real Lance one does but is

 * layed out like how the HPC DMA and the Seeq want it to.  You'd be surprised

 * how a stupid idea like this can pay off in performance, not to mention

 * making this driver 2,000 times easier to write. ;-)

 */

/* Tune these if we tend to run out often etc. */

#define SEEQ_RX_BUFFERS  16

#define SEEQ_TX_BUFFERS  16

#define PKT_BUF_SZ       1584

#define NEXT_RX(i)  (((i) + 1) & (SEEQ_RX_BUFFERS - 1))

#define NEXT_TX(i)  (((i) + 1) & (SEEQ_TX_BUFFERS - 1))

#define PREV_RX(i)  (((i) - 1) & (SEEQ_RX_BUFFERS - 1))

#define PREV_TX(i)  (((i) - 1) & (SEEQ_TX_BUFFERS - 1))

#define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \

                            sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \

                            sp->tx_old - sp->tx_new - 1)

#define DEBUG

struct sgiseeq_rx_desc {

        struct hpc_dma_desc rdma;

        signed int buf_vaddr;

};

struct sgiseeq_tx_desc {

        struct hpc_dma_desc tdma;

        signed int buf_vaddr;

};

/*

 * Warning: This structure is layed out in a certain way because HPC dma

 *          descriptors must be 8-byte aligned.  So don't touch this without

 *          some care.

 */

struct sgiseeq_init_block { /* Note the name ;-) */

        /* Ptrs to the descriptors in KSEG1 uncached space. */

        struct sgiseeq_rx_desc *rx_desc;

        struct sgiseeq_tx_desc *tx_desc;

        unsigned int _padding[30]; /* Pad out to largest cache line size. */

        struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];

        struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];

};

struct sgiseeq_private {

        volatile struct sgiseeq_init_block srings;

        char *name;

        struct hpc3_ethregs *hregs;

        struct sgiseeq_regs *sregs;

        /* Ring entry counters. */

        unsigned int rx_new, tx_new;

        unsigned int rx_old, tx_old;

        int is_edlc;

        unsigned char control;

        unsigned char mode;

        struct net_device_stats stats;

        struct net_device *next_module;

        spinlock_t tx_lock;

};

/* A list of all installed seeq devices, for removing the driver module. */

static struct net_device *root_sgiseeq_dev;

static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)

{

        hregs->rx_reset = HPC3_ERXRST_CRESET | HPC3_ERXRST_CLRIRQ;

        udelay(20);

        hregs->rx_reset = 0;

}

static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,

                                       struct sgiseeq_regs *sregs)

{

        hregs->rx_ctrl = hregs->tx_ctrl = 0;

        hpc3_eth_reset(hregs);

}

#define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \

                       SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)

static inline void seeq_go(struct sgiseeq_private *sp,

                           struct hpc3_ethregs *hregs,

                           struct sgiseeq_regs *sregs)

{

        sregs->rstat = sp->mode | RSTAT_GO_BITS;

        hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;

}

static inline void seeq_load_eaddr(struct net_device *dev,

                                   struct sgiseeq_regs *sregs)

{

        int i;

        sregs->tstat = SEEQ_TCMD_RB0;

        for (i = 0; i < 6; i++)

                sregs->rw.eth_addr[i] = dev->dev_addr[i];

}

#define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)

#define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)

#define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))

static int seeq_init_ring(struct net_device *dev)

{

        struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;

        volatile struct sgiseeq_init_block *ib = &sp->srings;

        int i;

        netif_stop_queue(dev);

        sp->rx_new = sp->tx_new = 0;

        sp->rx_old = sp->tx_old = 0;

        seeq_load_eaddr(dev, sp->sregs);

        /* XXX for now just accept packets directly to us

         * XXX and ether-broadcast.  Will do multicast and

         * XXX promiscuous mode later. -davem

         */

        sp->mode = SEEQ_RCMD_RBCAST;

        /* Setup tx ring. */

        for(i = 0; i < SEEQ_TX_BUFFERS; i++) {

                if (!ib->tx_desc[i].tdma.pbuf) {

                        unsigned long buffer;

                        buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);

                        if (!buffer)

                                return -ENOMEM;

                        ib->tx_desc[i].buf_vaddr = KSEG1ADDR(buffer);

                        ib->tx_desc[i].tdma.pbuf = PHYSADDR(buffer);

                }

                ib->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;

        }

        /* And now the rx ring. */

        for (i = 0; i < SEEQ_RX_BUFFERS; i++) {

                if (!ib->rx_desc[i].rdma.pbuf) {

                        unsigned long buffer;

                        buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);

                        if (!buffer)

                                return -ENOMEM;

                        ib->rx_desc[i].buf_vaddr = KSEG1ADDR(buffer);

                        ib->rx_desc[i].rdma.pbuf = PHYSADDR(buffer);

                }

                ib->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;

        }

        ib->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;

        return 0;

}

#ifdef DEBUG

static struct sgiseeq_private *gpriv;

static struct net_device *gdev;

void sgiseeq_dump_rings(void)

{

        static int once;

        struct sgiseeq_rx_desc *r = gpriv->srings.rx_desc;

        struct sgiseeq_tx_desc *t = gpriv->srings.tx_desc;

        struct hpc3_ethregs *hregs = gpriv->hregs;

        int i;

        if (once)

                return;

        once++;

        printk("RING DUMP:\n");

        for (i = 0; i < SEEQ_RX_BUFFERS; i++) {

                printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",

                       i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,

                       r[i].rdma.pnext);

                i += 1;

                printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",

                       i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,

                       r[i].rdma.pnext);

        }

        for (i = 0; i < SEEQ_TX_BUFFERS; i++) {

                printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",

                       i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,

                       t[i].tdma.pnext);

                i += 1;

                printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",

                       i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,

                       t[i].tdma.pnext);

        }

        printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",

               gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);

        printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",

               hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);

        printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",

               hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);

}

#endif

#define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)

#define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)

#define RDMACFG_INIT    (HPC3_ERXDCFG_FRXDC | HPC3_ERXDCFG_FEOP | HPC3_ERXDCFG_FIRQ)

static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,

                     struct sgiseeq_regs *sregs)

{

        struct hpc3_ethregs *hregs = sp->hregs;

        int err;

        reset_hpc3_and_seeq(hregs, sregs);

        err = seeq_init_ring(dev);

        if (err)

                return err;

        /* Setup to field the proper interrupt types. */

        if (sp->is_edlc) {

                sregs->tstat = TSTAT_INIT_EDLC;

                sregs->rw.wregs.control = sp->control;

                sregs->rw.wregs.frame_gap = 0;

        } else {

                sregs->tstat = TSTAT_INIT_SEEQ;

        }

        hregs->rx_dconfig |= RDMACFG_INIT;

        hregs->rx_ndptr = PHYSADDR(&sp->srings.rx_desc[0]);

        hregs->tx_ndptr = PHYSADDR(&sp->srings.tx_desc[0]);

        seeq_go(sp, hregs, sregs);

        return 0;

}

static inline void record_rx_errors(struct sgiseeq_private *sp,

                                    unsigned char status)

{

        if (status & SEEQ_RSTAT_OVERF ||

            status & SEEQ_RSTAT_SFRAME)

                sp->stats.rx_over_errors++;

        if (status & SEEQ_RSTAT_CERROR)

                sp->stats.rx_crc_errors++;

        if (status & SEEQ_RSTAT_DERROR)

                sp->stats.rx_frame_errors++;

        if (status & SEEQ_RSTAT_REOF)

                sp->stats.rx_errors++;

}

static inline void rx_maybe_restart(struct sgiseeq_private *sp,

                                    struct hpc3_ethregs *hregs,

                                    struct sgiseeq_regs *sregs)

{

        if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {

                hregs->rx_ndptr = PHYSADDR(&sp->srings.rx_desc[sp->rx_new]);

                seeq_go(sp, hregs, sregs);

        }

}

#define for_each_rx(rd, sp) for((rd) = &(sp)->srings.rx_desc[(sp)->rx_new]; \

                                !((rd)->rdma.cntinfo & HPCDMA_OWN); \

                                (rd) = &(sp)->srings.rx_desc[(sp)->rx_new])

static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,

                              struct hpc3_ethregs *hregs,

                              struct sgiseeq_regs *sregs)

{

        struct sgiseeq_rx_desc *rd;

        struct sk_buff *skb = 0;

        unsigned char pkt_status;

        unsigned char *pkt_pointer = 0;

        int len = 0;

        unsigned int orig_end = PREV_RX(sp->rx_new);

        /* Service every received packet. */

        for_each_rx(rd, sp) {

                len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;

                pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;

                pkt_status = pkt_pointer[len + 2];

                if (pkt_status & SEEQ_RSTAT_FIG) {

                        /* Packet is OK. */

                        skb = dev_alloc_skb(len + 2);

                        if (skb) {

                                skb->dev = dev;

                                skb_reserve(skb, 2);

                                skb_put(skb, len);

                                /* Copy out of kseg1 to avoid silly cache flush. */

                                eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);

                                skb->protocol = eth_type_trans(skb, dev);

                                netif_rx(skb);

                                dev->last_rx = jiffies;

                                sp->stats.rx_packets++;

                                sp->stats.rx_bytes += len;

                        } else {

                                printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",

                                        dev->name);

                                sp->stats.rx_dropped++;

                        }

                } else {

                        record_rx_errors(sp, pkt_status);

                }

                /* Return the entry to the ring pool. */

                rd->rdma.cntinfo = RCNTINFO_INIT;

                sp->rx_new = NEXT_RX(sp->rx_new);

        }

        sp->srings.rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);

        sp->srings.rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;

        rx_maybe_restart(sp, hregs, sregs);

}

static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,

                                             struct sgiseeq_regs *sregs)

{

        if (sp->is_edlc) {

                sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);

                sregs->rw.wregs.control = sp->control;

        }

}

static inline void kick_tx(struct sgiseeq_tx_desc *td,

                           struct hpc3_ethregs *hregs)

{

        /* If the HPC aint doin nothin, and there are more packets

         * with ETXD cleared and XIU set we must make very certain

         * that we restart the HPC else we risk locking up the

         * adapter.  The following code is only safe iff the HPCDMA

         * is not active!

         */

        while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==

              (HPCDMA_XIU | HPCDMA_ETXD))

                td = (struct sgiseeq_tx_desc *)(long) KSEG1ADDR(td->tdma.pnext);

        if (td->tdma.cntinfo & HPCDMA_XIU) {

                hregs->tx_ndptr = PHYSADDR(td);

                hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;

        }

}

static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,

                              struct hpc3_ethregs *hregs,

                              struct sgiseeq_regs *sregs)

{

        struct sgiseeq_tx_desc *td;

        unsigned long status = hregs->tx_ctrl;

        int j;

        tx_maybe_reset_collisions(sp, sregs);

        if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {

                /* Oops, HPC detected some sort of error. */

                if (status & SEEQ_TSTAT_R16)

                        sp->stats.tx_aborted_errors++;

                if (status & SEEQ_TSTAT_UFLOW)

                        sp->stats.tx_fifo_errors++;

                if (status & SEEQ_TSTAT_LCLS)

                        sp->stats.collisions++;

        }

        /* Ack 'em... */

        for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {

                td = &sp->srings.tx_desc[j];

                if (!(td->tdma.cntinfo & (HPCDMA_XIU)))

                        break;

                if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {

                        if (!(status & HPC3_ETXCTRL_ACTIVE)) {

                                hregs->tx_ndptr = PHYSADDR(td);

                                hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;

                        }

                        break;

                }

                sp->stats.tx_packets++;

                sp->tx_old = NEXT_TX(sp->tx_old);

                td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);

                td->tdma.cntinfo |= HPCDMA_EOX;

        }

}

static void sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs)

{

        struct net_device *dev = (struct net_device *) dev_id;

        struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;

        struct hpc3_ethregs *hregs = sp->hregs;

        struct sgiseeq_regs *sregs = sp->sregs;

        spin_lock(&sp->tx_lock);

        /* Ack the IRQ and set software state. */

        hregs->rx_reset = HPC3_ERXRST_CLRIRQ;

        /* Always check for received packets. */

        sgiseeq_rx(dev, sp, hregs, sregs);

        /* Only check for tx acks if we have something queued. */

        if (sp->tx_old != sp->tx_new)

                sgiseeq_tx(dev, sp, hregs, sregs);

        if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {

                netif_wake_queue(dev);

        }

        spin_unlock(&sp->tx_lock);

}

static int sgiseeq_open(struct net_device *dev)

{

        struct sgiseeq_private *sp = (struct sgiseeq_private *)dev->priv;

        struct sgiseeq_regs *sregs = sp->sregs;

        int err = init_seeq(dev, sp, sregs);

        if (err)

                return err;

        netif_start_queue(dev);

        return 0;

}

static int sgiseeq_close(struct net_device *dev)

{

        struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;

        struct sgiseeq_regs *sregs = sp->sregs;

        netif_stop_queue(dev);

        /* Shutdown the Seeq. */

        reset_hpc3_and_seeq(sp->hregs, sregs);

        return 0;

}

static inline int sgiseeq_reset(struct net_device *dev)

{

        struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;

        struct sgiseeq_regs *sregs = sp->sregs;

        int err;

        err = init_seeq(dev, sp, sregs);

        if (err)

                return err;

        dev->trans_start = jiffies;

        netif_wake_queue(dev);

        return 0;

}

void sgiseeq_my_reset(void)

{

        printk("RESET!\n");

        sgiseeq_reset(gdev);

}

static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)

{

        struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;

        struct hpc3_ethregs *hregs = sp->hregs;

        unsigned long flags;

        struct sgiseeq_tx_desc *td;

        int skblen, len, entry;

        spin_lock_irqsave(&sp->tx_lock, flags);

        /* Setup... */

        skblen = skb->len;

        len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;

        sp->stats.tx_bytes += len;

        entry = sp->tx_new;

        td = &sp->srings.tx_desc[entry];

        /* Create entry.  There are so many races with adding a new

         * descriptor to the chain:

         * 1) Assume that the HPC is off processing a DMA chain while

         *    we are changing all of the following.

         * 2) Do no allow the HPC to look at a new descriptor until

         *    we have completely set up it's state.  This means, do

         *    not clear HPCDMA_EOX in the current last descritptor

         *    until the one we are adding looks consistent and could

         *    be processes right now.

         * 3) The tx interrupt code must notice when we've added a new

         *    entry and the HPC got to the end of the chain before we

         *    added this new entry and restarted it.

         */

        memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);

        if (len != skblen)

                memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);

        td->tdma.cntinfo = (len & HPCDMA_BCNT) |

                           HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;

        if (sp->tx_old != sp->tx_new) {

                struct sgiseeq_tx_desc *backend;

                backend = &sp->srings.tx_desc[PREV_TX(sp->tx_new)];

                backend->tdma.cntinfo &= ~HPCDMA_EOX;

        }

        sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */

        /* Maybe kick the HPC back into motion. */

        if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))

                kick_tx(&sp->srings.tx_desc[sp->tx_old], hregs);

        dev->trans_start = jiffies;

        dev_kfree_skb(skb);

        if (!TX_BUFFS_AVAIL(sp))

                netif_stop_queue(dev);

        spin_unlock_irqrestore(&sp->tx_lock, flags);

        return 0;

}

static void timeout(struct net_device *dev)

{

        printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);

        sgiseeq_reset(dev);

        dev->trans_start = jiffies;

        netif_wake_queue(dev);

}

static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)

{

        struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;

        return &sp->stats;

}

static void sgiseeq_set_multicast(struct net_device *dev)

{

}

static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)

{

        int i = 0;

        while (i < (nbufs - 1)) {

                buf[i].tdma.pnext = PHYSADDR(&buf[i + 1]);

                buf[i].tdma.pbuf = 0;

                i++;

        }

        buf[i].tdma.pnext = PHYSADDR(&buf[0]);

}

static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)

{

        int i = 0;

        while (i < (nbufs - 1)) {

                buf[i].rdma.pnext = PHYSADDR(&buf[i + 1]);

                buf[i].rdma.pbuf = 0;

                i++;

        }

        buf[i].rdma.pbuf = 0;

        buf[i].rdma.pnext = PHYSADDR(&buf[0]);

}

#define ALIGNED(x)  ((((unsigned long)(x)) + 0xf) & ~(0xf))

int sgiseeq_init(struct hpc3_regs* regs, int irq)

{

        struct net_device *dev;

        struct sgiseeq_private *sp;

        int err, i;

        dev = alloc_etherdev(0);

        if (!dev) {

                printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");

                err = -ENOMEM;

                goto err_out;

        }

        /* Make private data page aligned */

        sp = (struct sgiseeq_private *) get_zeroed_page(GFP_KERNEL);

        if (!sp) {

                printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");

                err = -ENOMEM;

                goto err_out_free_dev;

        }

        if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {

                printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);

                err = -EAGAIN;

                goto err_out_free_page;

        }

#define EADDR_NVOFS     250

        for (i = 0; i < 3; i++) {

                unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i);

                dev->dev_addr[2 * i]     = tmp >> 8;

                dev->dev_addr[2 * i + 1] = tmp & 0xff;

        }

#ifdef DEBUG

        gpriv = sp;

        gdev = dev;

#endif

        sp->sregs = (struct sgiseeq_regs *) &hpc3c0->eth_ext[0];

        sp->hregs = &hpc3c0->ethregs;

        sp->name = sgiseeqstr;

        sp->srings.rx_desc = (struct sgiseeq_rx_desc *)