Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 773 insertions, 0 deletions

diff --git a/drivers/net/sgiseeq.c b/drivers/net/sgiseeq.c
new file mode 100644
index 0000000000..9bc3b1c0dd
--- /dev/null
+++ b/drivers/net/sgiseeq.c
@@ -0,0 +1,773 @@
+/*
+ * 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 <linux/bitops.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/system.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 {
+        volatile struct hpc_dma_desc rdma;
+        volatile signed int buf_vaddr;
+};
+
+struct sgiseeq_tx_desc {
+        volatile struct hpc_dma_desc tdma;
+        volatile 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 ;-) */
+        struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
+        struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
+};
+
+struct sgiseeq_private {
+        struct sgiseeq_init_block *srings;
+
+        /* Ptrs to the descriptors in uncached space. */
+        struct sgiseeq_rx_desc *rx_desc;
+        struct sgiseeq_tx_desc *tx_desc;
+
+        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 __sgiseeq_set_mac_address(struct net_device *dev)
+{
+        struct sgiseeq_private *sp = netdev_priv(dev);
+        struct sgiseeq_regs *sregs = sp->sregs;
+        int i;
+
+        sregs->tstat = SEEQ_TCMD_RB0;
+        for (i = 0; i < 6; i++)
+                sregs->rw.eth_addr[i] = dev->dev_addr[i];
+}
+
+static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
+{
+        struct sgiseeq_private *sp = netdev_priv(dev);
+        struct sockaddr *sa = addr;
+
+        memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+
+        spin_lock_irq(&sp->tx_lock);
+        __sgiseeq_set_mac_address(dev);
+        spin_unlock_irq(&sp->tx_lock);
+
+        return 0;
+}
+
+#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 = netdev_priv(dev);
+        int i;
+
+        netif_stop_queue(dev);
+        sp->rx_new = sp->tx_new = 0;
+        sp->rx_old = sp->tx_old = 0;
+
+        __sgiseeq_set_mac_address(dev);
+
+        /* Setup tx ring. */
+        for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
+                if (!sp->tx_desc[i].tdma.pbuf) {
+                        unsigned long buffer;
+
+                        buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
+                        if (!buffer)
+                                return -ENOMEM;
+                        sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
+                        sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer);
+                }
+                sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
+        }
+
+        /* And now the rx ring. */
+        for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
+                if (!sp->rx_desc[i].rdma.pbuf) {
+                        unsigned long buffer;
+
+                        buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
+                        if (!buffer)
+                                return -ENOMEM;
+                        sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
+                        sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer);
+                }
+                sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
+        }
+        sp->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->rx_desc;
+        struct sgiseeq_tx_desc *t = gpriv->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 = CPHYSADDR(sp->rx_desc);
+        hregs->tx_ndptr = CPHYSADDR(sp->tx_desc);
+
+        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 = CPHYSADDR(sp->rx_desc + sp->rx_new);
+                seeq_go(sp, hregs, sregs);
+        }
+}
+
+#define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \
+                                !((rd)->rdma.cntinfo & HPCDMA_OWN); \
+                                (rd) = &(sp)->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);
+
+                                /* We don't want to receive our own packets */
+                                if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) {
+                                        netif_rx(skb);
+                                        dev->last_rx = jiffies;
+                                        sp->stats.rx_packets++;
+                                        sp->stats.rx_bytes += len;
+                                } else {
+                                        /* Silently drop my own packets */
+                                        dev_kfree_skb_irq(skb);
+                                }
+                        } 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->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
+        sp->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) CKSEG1ADDR(td->tdma.pnext);
+        if (td->tdma.cntinfo & HPCDMA_XIU) {
+                hregs->tx_ndptr = CPHYSADDR(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->tx_desc[j];
+
+                if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
+                        break;
+                if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
+                        if (!(status & HPC3_ETXCTRL_ACTIVE)) {
+                                hregs->tx_ndptr = CPHYSADDR(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 irqreturn_t sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct net_device *dev = (struct net_device *) dev_id;
+        struct sgiseeq_private *sp = netdev_priv(dev);
+        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);
+
+        return IRQ_HANDLED;
+}
+
+static int sgiseeq_open(struct net_device *dev)
+{
+        struct sgiseeq_private *sp = netdev_priv(dev);
+        struct sgiseeq_regs *sregs = sp->sregs;
+        unsigned int irq = dev->irq;
+        int err;
+
+        if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
+                printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
+                err = -EAGAIN;
+        }
+
+        err = init_seeq(dev, sp, sregs);
+        if (err)
+                goto out_free_irq;
+
+        netif_start_queue(dev);
+
+        return 0;
+
+out_free_irq:
+        free_irq(irq, dev);
+
+        return err;
+}
+
+static int sgiseeq_close(struct net_device *dev)
+{
+        struct sgiseeq_private *sp = netdev_priv(dev);
+        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 = netdev_priv(dev);
+        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 = netdev_priv(dev);
+        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->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->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->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 = netdev_priv(dev);
+
+        return &sp->stats;
+}
+
+static void sgiseeq_set_multicast(struct net_device *dev)
+{
+        struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
+        unsigned char oldmode = sp->mode;
+
+        if(dev->flags & IFF_PROMISC)
+                sp->mode = SEEQ_RCMD_RANY;
+        else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count)
+                sp->mode = SEEQ_RCMD_RBMCAST;
+        else
+                sp->mode = SEEQ_RCMD_RBCAST;
+
+        /* XXX I know this sucks, but is there a better way to reprogram
+         * XXX the receiver? At least, this shouldn't happen too often.
+         */
+
+        if (oldmode != sp->mode)
+                sgiseeq_reset(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 = CPHYSADDR(buf + i + 1);
+                buf[i].tdma.pbuf = 0;
+                i++;
+        }
+        buf[i].tdma.pnext = CPHYSADDR(buf);
+}
+
+static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
+{
+        int i = 0;
+
+        while (i < (nbufs - 1)) {
+                buf[i].rdma.pnext = CPHYSADDR(buf + i + 1);
+                buf[i].rdma.pbuf = 0;
+                i++;
+        }
+        buf[i].rdma.pbuf = 0;
+        buf[i].rdma.pnext = CPHYSADDR(buf);
+}
+
+#define ALIGNED(x)  ((((unsigned long)(x)) + 0xf) & ~(0xf))
+
+static int sgiseeq_init(struct hpc3_regs* regs, int irq)
+{
+        struct sgiseeq_init_block *sr;
+        struct sgiseeq_private *sp;
+        struct net_device *dev;
+        int err, i;
+
+        dev = alloc_etherdev(sizeof (struct sgiseeq_private));
+        if (!dev) {
+                printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
+                err = -ENOMEM;
+                goto err_out;
+        }
+        sp = netdev_priv(dev);
+
+        /* Make private data page aligned */
+        sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL);
+        if (!sr) {
+                printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
+                err = -ENOMEM;
+                goto err_out_free_dev;
+        }
+        sp->srings = sr;
+
+#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->mode = SEEQ_RCMD_RBCAST;
+
+        sp->rx_desc = (struct sgiseeq_rx_desc *)
+                      CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0]));
+        dma_cache_wback_inv((unsigned long)&sp->srings->rxvector,
+                            sizeof(sp->srings->rxvector));
+        sp->tx_desc = (struct sgiseeq_tx_desc *)
+                      CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0]));
+        dma_cache_wback_inv((unsigned long)&sp->srings->txvector,
+                            sizeof(sp->srings->txvector));
+
+        /* A couple calculations now, saves many cycles later. */
+        setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS);
+        setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS);
+
+        /* Reset the chip. */
+        hpc3_eth_reset(sp->hregs);
+
+        sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
+        if (sp->is_edlc)
+                sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
+                              SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
+                              SEEQ_CTRL_ENCARR;
+
+        dev->open               = sgiseeq_open;
+        dev->stop               = sgiseeq_close;
+        dev->hard_start_xmit    = sgiseeq_start_xmit;
+        dev->tx_timeout         = timeout;
+        dev->watchdog_timeo     = (200 * HZ) / 1000;
+        dev->get_stats          = sgiseeq_get_stats;
+        dev->set_multicast_list = sgiseeq_set_multicast;
+        dev->set_mac_address    = sgiseeq_set_mac_address;
+        dev->irq                = irq;
+
+        if (register_netdev(dev)) {
+                printk(KERN_ERR "Sgiseeq: Cannot register net device, "
+                       "aborting.\n");
+                err = -ENODEV;
+                goto err_out_free_page;
+        }
+
+        printk(KERN_INFO "%s: SGI Seeq8003 ", dev->name);
+        for (i = 0; i < 6; i++)
+                printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
+
+        sp->next_module = root_sgiseeq_dev;
+        root_sgiseeq_dev = dev;
+
+        return 0;
+
+err_out_free_page:
+        free_page((unsigned long) sp);
+err_out_free_dev:
+        kfree(dev);
+
+err_out:
+        return err;
+}
+
+static int __init sgiseeq_probe(void)
+{
+        printk(version);
+
+        /* On board adapter on 1st HPC is always present */
+        return sgiseeq_init(hpc3c0, SGI_ENET_IRQ);
+}
+
+static void __exit sgiseeq_exit(void)
+{
+        struct net_device *next, *dev;
+        struct sgiseeq_private *sp;
+        int irq;
+
+        for (dev = root_sgiseeq_dev; dev; dev = next) {
+                sp = (struct sgiseeq_private *) netdev_priv(dev);
+                next = sp->next_module;
+                irq = dev->irq;
+                unregister_netdev(dev);
+                free_irq(irq, dev);
+                free_page((unsigned long) sp);
+                free_netdev(dev);
+        }
+}
+
+module_init(sgiseeq_probe);
+module_exit(sgiseeq_exit);
+
+MODULE_LICENSE("GPL");