drivers/net/sgiseeq.c

   1 /*
   2  * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
   3  *
   4  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
   5  */
   6
   7 #undef DEBUG
   8
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/errno.h>
  12 #include <linux/init.h>
  13 #include <linux/types.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/ioport.h>
  16 #include <linux/socket.h>
  17 #include <linux/in.h>
  18 #include <linux/route.h>
  19 #include <linux/slab.h>
  20 #include <linux/string.h>
  21 #include <linux/delay.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/bitops.h>
  26
  27 #include <asm/byteorder.h>
  28 #include <asm/io.h>
  29 #include <asm/system.h>
  30 #include <asm/page.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/sgi/hpc3.h>
  33 #include <asm/sgi/ip22.h>
  34 #include <asm/sgialib.h>
  35
  36 #include "sgiseeq.h"
  37
  38 static char *sgiseeqstr = "SGI Seeq8003";
  39
  40 /*
  41  * If you want speed, you do something silly, it always has worked for me.  So,
  42  * with that in mind, I've decided to make this driver look completely like a
  43  * stupid Lance from a driver architecture perspective.  Only difference is that
  44  * here our "ring buffer" looks and acts like a real Lance one does but is
  45  * layed out like how the HPC DMA and the Seeq want it to.  You'd be surprised
  46  * how a stupid idea like this can pay off in performance, not to mention
  47  * making this driver 2,000 times easier to write. ;-)
  48  */
  49
  50 /* Tune these if we tend to run out often etc. */
  51 #define SEEQ_RX_BUFFERS  16
  52 #define SEEQ_TX_BUFFERS  16
  53
  54 #define PKT_BUF_SZ       1584
  55
  56 #define NEXT_RX(i)  (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
  57 #define NEXT_TX(i)  (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
  58 #define PREV_RX(i)  (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
  59 #define PREV_TX(i)  (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
  60
  61 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
  62                             sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
  63                             sp->tx_old - sp->tx_new - 1)
  64
  65 struct sgiseeq_rx_desc {
  66         volatile struct hpc_dma_desc rdma;
  67         volatile signed int buf_vaddr;
  68 };
  69
  70 struct sgiseeq_tx_desc {
  71         volatile struct hpc_dma_desc tdma;
  72         volatile signed int buf_vaddr;
  73 };
  74
  75 /*
  76  * Warning: This structure is layed out in a certain way because HPC dma
  77  *          descriptors must be 8-byte aligned.  So don't touch this without
  78  *          some care.
  79  */
  80 struct sgiseeq_init_block { /* Note the name ;-) */
  81         struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
  82         struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
  83 };
  84
  85 struct sgiseeq_private {
  86         struct sgiseeq_init_block *srings;
  87
  88         /* Ptrs to the descriptors in uncached space. */
  89         struct sgiseeq_rx_desc *rx_desc;
  90         struct sgiseeq_tx_desc *tx_desc;
  91
  92         char *name;
  93         struct hpc3_ethregs *hregs;
  94         struct sgiseeq_regs *sregs;
  95
  96         /* Ring entry counters. */
  97         unsigned int rx_new, tx_new;
  98         unsigned int rx_old, tx_old;
  99
 100         int is_edlc;
 101         unsigned char control;
 102         unsigned char mode;
 103
 104         struct net_device_stats stats;
 105
 106         struct net_device *next_module;
 107         spinlock_t tx_lock;
 108 };
 109
 110 /* A list of all installed seeq devices, for removing the driver module. */
 111 static struct net_device *root_sgiseeq_dev;
 112
 113 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
 114 {
 115         hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
 116         udelay(20);
 117         hregs->reset = 0;
 118 }
 119
 120 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
 121                                        struct sgiseeq_regs *sregs)
 122 {
 123         hregs->rx_ctrl = hregs->tx_ctrl = 0;
 124         hpc3_eth_reset(hregs);
 125 }
 126
 127 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
 128                        SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
 129
 130 static inline void seeq_go(struct sgiseeq_private *sp,
 131                            struct hpc3_ethregs *hregs,
 132                            struct sgiseeq_regs *sregs)
 133 {
 134         sregs->rstat = sp->mode | RSTAT_GO_BITS;
 135         hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
 136 }
 137
 138 static inline void __sgiseeq_set_mac_address(struct net_device *dev)
 139 {
 140         struct sgiseeq_private *sp = netdev_priv(dev);
 141         struct sgiseeq_regs *sregs = sp->sregs;
 142         int i;
 143
 144         sregs->tstat = SEEQ_TCMD_RB0;
 145         for (i = 0; i < 6; i++)
 146                 sregs->rw.eth_addr[i] = dev->dev_addr[i];
 147 }
 148
 149 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
 150 {
 151         struct sgiseeq_private *sp = netdev_priv(dev);
 152         struct sockaddr *sa = addr;
 153
 154         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 155
 156         spin_lock_irq(&sp->tx_lock);
 157         __sgiseeq_set_mac_address(dev);
 158         spin_unlock_irq(&sp->tx_lock);
 159
 160         return 0;
 161 }
 162
 163 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
 164 #define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
 165 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
 166
 167 static int seeq_init_ring(struct net_device *dev)
 168 {
 169         struct sgiseeq_private *sp = netdev_priv(dev);
 170         int i;
 171
 172         netif_stop_queue(dev);
 173         sp->rx_new = sp->tx_new = 0;
 174         sp->rx_old = sp->tx_old = 0;
 175
 176         __sgiseeq_set_mac_address(dev);
 177
 178         /* Setup tx ring. */
 179         for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
 180                 if (!sp->tx_desc[i].tdma.pbuf) {
 181                         unsigned long buffer;
 182
 183                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 184                         if (!buffer)
 185                                 return -ENOMEM;
 186                         sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
 187                         sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer);
 188                 }
 189                 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
 190         }
 191
 192         /* And now the rx ring. */
 193         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 194                 if (!sp->rx_desc[i].rdma.pbuf) {
 195                         unsigned long buffer;
 196
 197                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 198                         if (!buffer)
 199                                 return -ENOMEM;
 200                         sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
 201                         sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer);
 202                 }
 203                 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
 204         }
 205         sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
 206         return 0;
 207 }
 208
 209 #ifdef DEBUG
 210 static struct sgiseeq_private *gpriv;
 211 static struct net_device *gdev;
 212
 213 static void sgiseeq_dump_rings(void)
 214 {
 215         static int once;
 216         struct sgiseeq_rx_desc *r = gpriv->rx_desc;
 217         struct sgiseeq_tx_desc *t = gpriv->tx_desc;
 218         struct hpc3_ethregs *hregs = gpriv->hregs;
 219         int i;
 220
 221         if (once)
 222                 return;
 223         once++;
 224         printk("RING DUMP:\n");
 225         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 226                 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
 227                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 228                        r[i].rdma.pnext);
 229                 i += 1;
 230                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 231                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 232                        r[i].rdma.pnext);
 233         }
 234         for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
 235                 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
 236                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 237                        t[i].tdma.pnext);
 238                 i += 1;
 239                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 240                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 241                        t[i].tdma.pnext);
 242         }
 243         printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
 244                gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
 245         printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
 246                hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
 247         printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
 248                hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
 249 }
 250 #endif
 251
 252 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
 253 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
 254
 255 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
 256                      struct sgiseeq_regs *sregs)
 257 {
 258         struct hpc3_ethregs *hregs = sp->hregs;
 259         int err;
 260
 261         reset_hpc3_and_seeq(hregs, sregs);
 262         err = seeq_init_ring(dev);
 263         if (err)
 264                 return err;
 265
 266         /* Setup to field the proper interrupt types. */
 267         if (sp->is_edlc) {
 268                 sregs->tstat = TSTAT_INIT_EDLC;
 269                 sregs->rw.wregs.control = sp->control;
 270                 sregs->rw.wregs.frame_gap = 0;
 271         } else {
 272                 sregs->tstat = TSTAT_INIT_SEEQ;
 273         }
 274
 275         hregs->rx_ndptr = CPHYSADDR(sp->rx_desc);
 276         hregs->tx_ndptr = CPHYSADDR(sp->tx_desc);
 277
 278         seeq_go(sp, hregs, sregs);
 279         return 0;
 280 }
 281
 282 static inline void record_rx_errors(struct sgiseeq_private *sp,
 283                                     unsigned char status)
 284 {
 285         if (status & SEEQ_RSTAT_OVERF ||
 286             status & SEEQ_RSTAT_SFRAME)
 287                 sp->stats.rx_over_errors++;
 288         if (status & SEEQ_RSTAT_CERROR)
 289                 sp->stats.rx_crc_errors++;
 290         if (status & SEEQ_RSTAT_DERROR)
 291                 sp->stats.rx_frame_errors++;
 292         if (status & SEEQ_RSTAT_REOF)
 293                 sp->stats.rx_errors++;
 294 }
 295
 296 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
 297                                     struct hpc3_ethregs *hregs,
 298                                     struct sgiseeq_regs *sregs)
 299 {
 300         if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
 301                 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new);
 302                 seeq_go(sp, hregs, sregs);
 303         }
 304 }
 305
 306 #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \
 307                                 !((rd)->rdma.cntinfo & HPCDMA_OWN); \
 308                                 (rd) = &(sp)->rx_desc[(sp)->rx_new])
 309
 310 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
 311                               struct hpc3_ethregs *hregs,
 312                               struct sgiseeq_regs *sregs)
 313 {
 314         struct sgiseeq_rx_desc *rd;
 315         struct sk_buff *skb = NULL;
 316         unsigned char pkt_status;
 317         unsigned char *pkt_pointer = NULL;
 318         int len = 0;
 319         unsigned int orig_end = PREV_RX(sp->rx_new);
 320
 321         /* Service every received packet. */
 322         for_each_rx(rd, sp) {
 323                 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
 324                 pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
 325                 pkt_status = pkt_pointer[len + 2];
 326
 327                 if (pkt_status & SEEQ_RSTAT_FIG) {
 328                         /* Packet is OK. */
 329                         skb = dev_alloc_skb(len + 2);
 330
 331                         if (skb) {
 332                                 skb->dev = dev;
 333                                 skb_reserve(skb, 2);
 334                                 skb_put(skb, len);
 335
 336                                 /* Copy out of kseg1 to avoid silly cache flush. */
 337                                 eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
 338                                 skb->protocol = eth_type_trans(skb, dev);
 339
 340                                 /* We don't want to receive our own packets */
 341                                 if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) {
 342                                         netif_rx(skb);
 343                                         dev->last_rx = jiffies;
 344                                         sp->stats.rx_packets++;
 345                                         sp->stats.rx_bytes += len;
 346                                 } else {
 347                                         /* Silently drop my own packets */
 348                                         dev_kfree_skb_irq(skb);
 349                                 }
 350                         } else {
 351                                 printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
 352                                         dev->name);
 353                                 sp->stats.rx_dropped++;
 354                         }
 355                 } else {
 356                         record_rx_errors(sp, pkt_status);
 357                 }
 358
 359                 /* Return the entry to the ring pool. */
 360                 rd->rdma.cntinfo = RCNTINFO_INIT;
 361                 sp->rx_new = NEXT_RX(sp->rx_new);
 362         }
 363         sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
 364         sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
 365         rx_maybe_restart(sp, hregs, sregs);
 366 }
 367
 368 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
 369                                              struct sgiseeq_regs *sregs)
 370 {
 371         if (sp->is_edlc) {
 372                 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
 373                 sregs->rw.wregs.control = sp->control;
 374         }
 375 }
 376
 377 static inline void kick_tx(struct sgiseeq_tx_desc *td,
 378                            struct hpc3_ethregs *hregs)
 379 {
 380         /* If the HPC aint doin nothin, and there are more packets
 381          * with ETXD cleared and XIU set we must make very certain
 382          * that we restart the HPC else we risk locking up the
 383          * adapter.  The following code is only safe iff the HPCDMA
 384          * is not active!
 385          */
 386         while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
 387               (HPCDMA_XIU | HPCDMA_ETXD))
 388                 td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext);
 389         if (td->tdma.cntinfo & HPCDMA_XIU) {
 390                 hregs->tx_ndptr = CPHYSADDR(td);
 391                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 392         }
 393 }
 394
 395 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
 396                               struct hpc3_ethregs *hregs,
 397                               struct sgiseeq_regs *sregs)
 398 {
 399         struct sgiseeq_tx_desc *td;
 400         unsigned long status = hregs->tx_ctrl;
 401         int j;
 402
 403         tx_maybe_reset_collisions(sp, sregs);
 404
 405         if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
 406                 /* Oops, HPC detected some sort of error. */
 407                 if (status & SEEQ_TSTAT_R16)
 408                         sp->stats.tx_aborted_errors++;
 409                 if (status & SEEQ_TSTAT_UFLOW)
 410                         sp->stats.tx_fifo_errors++;
 411                 if (status & SEEQ_TSTAT_LCLS)
 412                         sp->stats.collisions++;
 413         }
 414
 415         /* Ack 'em... */
 416         for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
 417                 td = &sp->tx_desc[j];
 418
 419                 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
 420                         break;
 421                 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
 422                         if (!(status & HPC3_ETXCTRL_ACTIVE)) {
 423                                 hregs->tx_ndptr = CPHYSADDR(td);
 424                                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 425                         }
 426                         break;
 427                 }
 428                 sp->stats.tx_packets++;
 429                 sp->tx_old = NEXT_TX(sp->tx_old);
 430                 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
 431                 td->tdma.cntinfo |= HPCDMA_EOX;
 432         }
 433 }
 434
 435 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 436 {
 437         struct net_device *dev = (struct net_device *) dev_id;
 438         struct sgiseeq_private *sp = netdev_priv(dev);
 439         struct hpc3_ethregs *hregs = sp->hregs;
 440         struct sgiseeq_regs *sregs = sp->sregs;
 441
 442         spin_lock(&sp->tx_lock);
 443
 444         /* Ack the IRQ and set software state. */
 445         hregs->reset = HPC3_ERST_CLRIRQ;
 446
 447         /* Always check for received packets. */
 448         sgiseeq_rx(dev, sp, hregs, sregs);
 449
 450         /* Only check for tx acks if we have something queued. */
 451         if (sp->tx_old != sp->tx_new)
 452                 sgiseeq_tx(dev, sp, hregs, sregs);
 453
 454         if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
 455                 netif_wake_queue(dev);
 456         }
 457         spin_unlock(&sp->tx_lock);
 458
 459         return IRQ_HANDLED;
 460 }
 461
 462 static int sgiseeq_open(struct net_device *dev)
 463 {
 464         struct sgiseeq_private *sp = netdev_priv(dev);
 465         struct sgiseeq_regs *sregs = sp->sregs;
 466         unsigned int irq = dev->irq;
 467         int err;
 468
 469         if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
 470                 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
 471                 err = -EAGAIN;
 472         }
 473
 474         err = init_seeq(dev, sp, sregs);
 475         if (err)
 476                 goto out_free_irq;
 477
 478         netif_start_queue(dev);
 479
 480         return 0;
 481
 482 out_free_irq:
 483         free_irq(irq, dev);
 484
 485         return err;
 486 }
 487
 488 static int sgiseeq_close(struct net_device *dev)
 489 {
 490         struct sgiseeq_private *sp = netdev_priv(dev);
 491         struct sgiseeq_regs *sregs = sp->sregs;
 492         unsigned int irq = dev->irq;
 493
 494         netif_stop_queue(dev);
 495
 496         /* Shutdown the Seeq. */
 497         reset_hpc3_and_seeq(sp->hregs, sregs);
 498         free_irq(irq, dev);
 499
 500         return 0;
 501 }
 502
 503 static inline int sgiseeq_reset(struct net_device *dev)
 504 {
 505         struct sgiseeq_private *sp = netdev_priv(dev);
 506         struct sgiseeq_regs *sregs = sp->sregs;
 507         int err;
 508
 509         err = init_seeq(dev, sp, sregs);
 510         if (err)
 511                 return err;
 512
 513         dev->trans_start = jiffies;
 514         netif_wake_queue(dev);
 515
 516         return 0;
 517 }
 518
 519 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
 520 {
 521         struct sgiseeq_private *sp = netdev_priv(dev);
 522         struct hpc3_ethregs *hregs = sp->hregs;
 523         unsigned long flags;
 524         struct sgiseeq_tx_desc *td;
 525         int skblen, len, entry;
 526
 527         spin_lock_irqsave(&sp->tx_lock, flags);
 528
 529         /* Setup... */
 530         skblen = skb->len;
 531         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 532         sp->stats.tx_bytes += len;
 533         entry = sp->tx_new;
 534         td = &sp->tx_desc[entry];
 535
 536         /* Create entry.  There are so many races with adding a new
 537          * descriptor to the chain:
 538          * 1) Assume that the HPC is off processing a DMA chain while
 539          *    we are changing all of the following.
 540          * 2) Do no allow the HPC to look at a new descriptor until
 541          *    we have completely set up it's state.  This means, do
 542          *    not clear HPCDMA_EOX in the current last descritptor
 543          *    until the one we are adding looks consistent and could
 544          *    be processes right now.
 545          * 3) The tx interrupt code must notice when we've added a new
 546          *    entry and the HPC got to the end of the chain before we
 547          *    added this new entry and restarted it.
 548          */
 549         memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);
 550         if (len != skblen)
 551                 memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);
 552         td->tdma.cntinfo = (len & HPCDMA_BCNT) |
 553                            HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
 554         if (sp->tx_old != sp->tx_new) {
 555                 struct sgiseeq_tx_desc *backend;
 556
 557                 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
 558                 backend->tdma.cntinfo &= ~HPCDMA_EOX;
 559         }
 560         sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
 561
 562         /* Maybe kick the HPC back into motion. */
 563         if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
 564                 kick_tx(&sp->tx_desc[sp->tx_old], hregs);
 565
 566         dev->trans_start = jiffies;
 567         dev_kfree_skb(skb);
 568
 569         if (!TX_BUFFS_AVAIL(sp))
 570                 netif_stop_queue(dev);
 571         spin_unlock_irqrestore(&sp->tx_lock, flags);
 572
 573         return 0;
 574 }
 575
 576 static void timeout(struct net_device *dev)
 577 {
 578         printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
 579         sgiseeq_reset(dev);
 580
 581         dev->trans_start = jiffies;
 582         netif_wake_queue(dev);
 583 }
 584
 585 static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)
 586 {
 587         struct sgiseeq_private *sp = netdev_priv(dev);
 588
 589         return &sp->stats;
 590 }
 591
 592 static void sgiseeq_set_multicast(struct net_device *dev)
 593 {
 594         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 595         unsigned char oldmode = sp->mode;
 596
 597         if(dev->flags & IFF_PROMISC)
 598                 sp->mode = SEEQ_RCMD_RANY;
 599         else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count)
 600                 sp->mode = SEEQ_RCMD_RBMCAST;
 601         else
 602                 sp->mode = SEEQ_RCMD_RBCAST;
 603
 604         /* XXX I know this sucks, but is there a better way to reprogram
 605          * XXX the receiver? At least, this shouldn't happen too often.
 606          */
 607
 608         if (oldmode != sp->mode)
 609                 sgiseeq_reset(dev);
 610 }
 611
 612 static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
 613 {
 614         int i = 0;
 615
 616         while (i < (nbufs - 1)) {
 617                 buf[i].tdma.pnext = CPHYSADDR(buf + i + 1);
 618                 buf[i].tdma.pbuf = 0;
 619                 i++;
 620         }
 621         buf[i].tdma.pnext = CPHYSADDR(buf);
 622 }
 623
 624 static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
 625 {
 626         int i = 0;
 627
 628         while (i < (nbufs - 1)) {
 629                 buf[i].rdma.pnext = CPHYSADDR(buf + i + 1);
 630                 buf[i].rdma.pbuf = 0;
 631                 i++;
 632         }
 633         buf[i].rdma.pbuf = 0;
 634         buf[i].rdma.pnext = CPHYSADDR(buf);
 635 }
 636
 637 #define ALIGNED(x)  ((((unsigned long)(x)) + 0xf) & ~(0xf))
 638
 639 static int sgiseeq_init(struct hpc3_regs* hpcregs, int irq)
 640 {
 641         struct sgiseeq_init_block *sr;
 642         struct sgiseeq_private *sp;
 643         struct net_device *dev;
 644         int err, i;
 645
 646         dev = alloc_etherdev(sizeof (struct sgiseeq_private));
 647         if (!dev) {
 648                 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
 649                 err = -ENOMEM;
 650                 goto err_out;
 651         }
 652         sp = netdev_priv(dev);
 653
 654         /* Make private data page aligned */
 655         sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL);
 656         if (!sr) {
 657                 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
 658                 err = -ENOMEM;
 659                 goto err_out_free_dev;
 660         }
 661         sp->srings = sr;
 662
 663 #define EADDR_NVOFS     250
 664         for (i = 0; i < 3; i++) {
 665                 unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i);
 666
 667                 dev->dev_addr[2 * i]     = tmp >> 8;
 668                 dev->dev_addr[2 * i + 1] = tmp & 0xff;
 669         }
 670
 671 #ifdef DEBUG
 672         gpriv = sp;
 673         gdev = dev;
 674 #endif
 675         sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
 676         sp->hregs = &hpcregs->ethregs;
 677         sp->name = sgiseeqstr;
 678         sp->mode = SEEQ_RCMD_RBCAST;
 679
 680         sp->rx_desc = (struct sgiseeq_rx_desc *)
 681                       CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0]));
 682         dma_cache_wback_inv((unsigned long)&sp->srings->rxvector,
 683                             sizeof(sp->srings->rxvector));
 684         sp->tx_desc = (struct sgiseeq_tx_desc *)
 685                       CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0]));
 686         dma_cache_wback_inv((unsigned long)&sp->srings->txvector,
 687                             sizeof(sp->srings->txvector));
 688
 689         /* A couple calculations now, saves many cycles later. */
 690         setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS);
 691         setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS);
 692
 693         /* Setup PIO and DMA transfer timing */
 694         sp->hregs->pconfig = 0x161;
 695         sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
 696                              HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
 697
 698         /* Reset the chip. */
 699         hpc3_eth_reset(sp->hregs);
 700
 701         sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
 702         if (sp->is_edlc)
 703                 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
 704                               SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
 705                               SEEQ_CTRL_ENCARR;
 706
 707         dev->open               = sgiseeq_open;
 708         dev->stop               = sgiseeq_close;
 709         dev->hard_start_xmit    = sgiseeq_start_xmit;
 710         dev->tx_timeout         = timeout;
 711         dev->watchdog_timeo     = (200 * HZ) / 1000;
 712         dev->get_stats          = sgiseeq_get_stats;
 713         dev->set_multicast_list = sgiseeq_set_multicast;
 714         dev->set_mac_address    = sgiseeq_set_mac_address;
 715         dev->irq                = irq;
 716
 717         if (register_netdev(dev)) {
 718                 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
 719                        "aborting.\n");
 720                 err = -ENODEV;
 721                 goto err_out_free_page;
 722         }
 723
 724         printk(KERN_INFO "%s: %s ", dev->name, sgiseeqstr);
 725         for (i = 0; i < 6; i++)
 726                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 727
 728         sp->next_module = root_sgiseeq_dev;
 729         root_sgiseeq_dev = dev;
 730
 731         return 0;
 732
 733 err_out_free_page:
 734         free_page((unsigned long) sp->srings);
 735 err_out_free_dev:
 736         kfree(dev);
 737
 738 err_out:
 739         return err;
 740 }
 741
 742 static int __init sgiseeq_probe(void)
 743 {
 744         /* On board adapter on 1st HPC is always present */
 745         return sgiseeq_init(hpc3c0, SGI_ENET_IRQ);
 746 }
 747
 748 static void __exit sgiseeq_exit(void)
 749 {
 750         struct net_device *next, *dev;
 751         struct sgiseeq_private *sp;
 752
 753         for (dev = root_sgiseeq_dev; dev; dev = next) {
 754                 sp = (struct sgiseeq_private *) netdev_priv(dev);
 755                 next = sp->next_module;
 756                 unregister_netdev(dev);
 757                 free_page((unsigned long) sp->srings);
 758                 free_netdev(dev);
 759         }
 760 }
 761
 762 module_init(sgiseeq_probe);
 763 module_exit(sgiseeq_exit);
 764
 765 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
 766 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
 767 MODULE_LICENSE("GPL");