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 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/errno.h>
   9 #include <linux/init.h>
  10 #include <linux/types.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/ioport.h>
  13 #include <linux/socket.h>
  14 #include <linux/in.h>
  15 #include <linux/route.h>
  16 #include <linux/slab.h>
  17 #include <linux/string.h>
  18 #include <linux/delay.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/skbuff.h>
  22
  23 #include <asm/byteorder.h>
  24 #include <asm/io.h>
  25 #include <asm/system.h>
  26 #include <asm/bitops.h>
  27 #include <asm/page.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/sgi/hpc3.h>
  30 #include <asm/sgi/ip22.h>
  31 #include <asm/sgialib.h>
  32
  33 #include "sgiseeq.h"
  34
  35 static char *version = "sgiseeq.c: David S. Miller (dm@engr.sgi.com)\n";
  36
  37 static char *sgiseeqstr = "SGI Seeq8003";
  38
  39 /*
  40  * If you want speed, you do something silly, it always has worked for me.  So,
  41  * with that in mind, I've decided to make this driver look completely like a
  42  * stupid Lance from a driver architecture perspective.  Only difference is that
  43  * here our "ring buffer" looks and acts like a real Lance one does but is
  44  * layed out like how the HPC DMA and the Seeq want it to.  You'd be surprised
  45  * how a stupid idea like this can pay off in performance, not to mention
  46  * making this driver 2,000 times easier to write. ;-)
  47  */
  48
  49 /* Tune these if we tend to run out often etc. */
  50 #define SEEQ_RX_BUFFERS  16
  51 #define SEEQ_TX_BUFFERS  16
  52
  53 #define PKT_BUF_SZ       1584
  54
  55 #define NEXT_RX(i)  (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
  56 #define NEXT_TX(i)  (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
  57 #define PREV_RX(i)  (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
  58 #define PREV_TX(i)  (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
  59
  60 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
  61                             sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
  62                             sp->tx_old - sp->tx_new - 1)
  63
  64 #define DEBUG
  65
  66 struct sgiseeq_rx_desc {
  67         struct hpc_dma_desc rdma;
  68         signed int buf_vaddr;
  69 };
  70
  71 struct sgiseeq_tx_desc {
  72         struct hpc_dma_desc tdma;
  73         signed int buf_vaddr;
  74 };
  75
  76 /*
  77  * Warning: This structure is layed out in a certain way because HPC dma
  78  *          descriptors must be 8-byte aligned.  So don't touch this without
  79  *          some care.
  80  */
  81 struct sgiseeq_init_block { /* Note the name ;-) */
  82         /* Ptrs to the descriptors in KSEG1 uncached space. */
  83         struct sgiseeq_rx_desc *rx_desc;
  84         struct sgiseeq_tx_desc *tx_desc;
  85         unsigned int _padding[30]; /* Pad out to largest cache line size. */
  86
  87         struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
  88         struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
  89 };
  90
  91 struct sgiseeq_private {
  92         volatile struct sgiseeq_init_block srings;
  93         char *name;
  94         struct hpc3_ethregs *hregs;
  95         struct sgiseeq_regs *sregs;
  96
  97         /* Ring entry counters. */
  98         unsigned int rx_new, tx_new;
  99         unsigned int rx_old, tx_old;
 100
 101         int is_edlc;
 102         unsigned char control;
 103         unsigned char mode;
 104
 105         struct net_device_stats stats;
 106
 107         struct net_device *next_module;
 108         spinlock_t tx_lock;
 109 };
 110
 111 /* A list of all installed seeq devices, for removing the driver module. */
 112 static struct net_device *root_sgiseeq_dev;
 113
 114 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
 115 {
 116         hregs->rx_reset = (HPC3_ERXRST_CRESET | HPC3_ERXRST_CLRIRQ);
 117         udelay(20);
 118         hregs->rx_reset = 0;
 119 }
 120
 121 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
 122                                        struct sgiseeq_regs *sregs)
 123 {
 124         hregs->rx_ctrl = hregs->tx_ctrl = 0;
 125         hpc3_eth_reset(hregs);
 126 }
 127
 128 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
 129                        SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
 130
 131 static inline void seeq_go(struct sgiseeq_private *sp,
 132                            struct hpc3_ethregs *hregs,
 133                            struct sgiseeq_regs *sregs)
 134 {
 135         sregs->rstat = sp->mode | RSTAT_GO_BITS;
 136         hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
 137 }
 138
 139 static inline void seeq_load_eaddr(struct net_device *dev,
 140                                    struct sgiseeq_regs *sregs)
 141 {
 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 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
 150 #define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
 151 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
 152
 153 static int seeq_init_ring(struct net_device *dev)
 154 {
 155         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 156         volatile struct sgiseeq_init_block *ib = &sp->srings;
 157         int i;
 158
 159         netif_stop_queue(dev);
 160         sp->rx_new = sp->tx_new = 0;
 161         sp->rx_old = sp->tx_old = 0;
 162
 163         seeq_load_eaddr(dev, sp->sregs);
 164
 165         /* XXX for now just accept packets directly to us
 166          * XXX and ether-broadcast.  Will do multicast and
 167          * XXX promiscuous mode later. -davem
 168          */
 169         sp->mode = SEEQ_RCMD_RBCAST;
 170
 171         /* Setup tx ring. */
 172         for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
 173                 if (!ib->tx_desc[i].tdma.pbuf) {
 174                         unsigned long buffer;
 175
 176                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 177                         if (!buffer)
 178                                 return -ENOMEM;
 179                         ib->tx_desc[i].buf_vaddr = KSEG1ADDR(buffer);
 180                         ib->tx_desc[i].tdma.pbuf = PHYSADDR(buffer);
 181                 }
 182                 ib->tx_desc[i].tdma.cntinfo = (TCNTINFO_INIT);
 183         }
 184
 185         /* And now the rx ring. */
 186         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 187                 if (!ib->rx_desc[i].rdma.pbuf) {
 188                         unsigned long buffer;
 189
 190                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 191                         if (!buffer)
 192                                 return -ENOMEM;
 193                         ib->rx_desc[i].buf_vaddr = KSEG1ADDR(buffer);
 194                         ib->rx_desc[i].rdma.pbuf = PHYSADDR(buffer);
 195                 }
 196                 ib->rx_desc[i].rdma.cntinfo = (RCNTINFO_INIT);
 197         }
 198         ib->rx_desc[i - 1].rdma.cntinfo |= (HPCDMA_EOR);
 199         return 0;
 200 }
 201
 202 #ifdef DEBUG
 203 static struct sgiseeq_private *gpriv;
 204 static struct net_device *gdev;
 205
 206 void sgiseeq_dump_rings(void)
 207 {
 208         static int once;
 209         struct sgiseeq_rx_desc *r = gpriv->srings.rx_desc;
 210         struct sgiseeq_tx_desc *t = gpriv->srings.tx_desc;
 211         struct hpc3_ethregs *hregs = gpriv->hregs;
 212         int i;
 213
 214         if (once)
 215                 return;
 216         once++;
 217         printk("RING DUMP:\n");
 218         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 219                 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
 220                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 221                        r[i].rdma.pnext);
 222                 i += 1;
 223                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 224                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 225                        r[i].rdma.pnext);
 226         }
 227         for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
 228                 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
 229                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 230                        t[i].tdma.pnext);
 231                 i += 1;
 232                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 233                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 234                        t[i].tdma.pnext);
 235         }
 236         printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
 237                gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
 238         printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
 239                hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
 240         printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
 241                hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
 242 }
 243 #endif
 244
 245 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
 246 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
 247 #define RDMACFG_INIT    (HPC3_ERXDCFG_FRXDC | HPC3_ERXDCFG_FEOP | HPC3_ERXDCFG_FIRQ)
 248
 249 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
 250                      struct sgiseeq_regs *sregs)
 251 {
 252         struct hpc3_ethregs *hregs = sp->hregs;
 253         int err;
 254
 255         reset_hpc3_and_seeq(hregs, sregs);
 256         err = seeq_init_ring(dev);
 257         if (err)
 258                 return err;
 259
 260         /* Setup to field the proper interrupt types. */
 261         if (sp->is_edlc) {
 262                 sregs->tstat = (TSTAT_INIT_EDLC);
 263                 sregs->rw.wregs.control = sp->control;
 264                 sregs->rw.wregs.frame_gap = 0;
 265         } else {
 266                 sregs->tstat = (TSTAT_INIT_SEEQ);
 267         }
 268
 269         hregs->rx_dconfig |= RDMACFG_INIT;
 270
 271         hregs->rx_ndptr = PHYSADDR(&sp->srings.rx_desc[0]);
 272         hregs->tx_ndptr = PHYSADDR(&sp->srings.tx_desc[0]);
 273
 274         seeq_go(sp, hregs, sregs);
 275         return 0;
 276 }
 277
 278 static inline void record_rx_errors(struct sgiseeq_private *sp,
 279                                     unsigned char status)
 280 {
 281         if (status & SEEQ_RSTAT_OVERF ||
 282             status & SEEQ_RSTAT_SFRAME)
 283                 sp->stats.rx_over_errors++;
 284         if (status & SEEQ_RSTAT_CERROR)
 285                 sp->stats.rx_crc_errors++;
 286         if (status & SEEQ_RSTAT_DERROR)
 287                 sp->stats.rx_frame_errors++;
 288         if (status & SEEQ_RSTAT_REOF)
 289                 sp->stats.rx_errors++;
 290 }
 291
 292 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
 293                                     struct hpc3_ethregs *hregs,
 294                                     struct sgiseeq_regs *sregs)
 295 {
 296         if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
 297                 hregs->rx_ndptr = PHYSADDR(&sp->srings.rx_desc[sp->rx_new]);
 298                 seeq_go(sp, hregs, sregs);
 299         }
 300 }
 301
 302 #define for_each_rx(rd, sp) for((rd) = &(sp)->srings.rx_desc[(sp)->rx_new]; \
 303                                 !((rd)->rdma.cntinfo & HPCDMA_OWN); \
 304                                 (rd) = &(sp)->srings.rx_desc[(sp)->rx_new])
 305
 306 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
 307                               struct hpc3_ethregs *hregs,
 308                               struct sgiseeq_regs *sregs)
 309 {
 310         struct sgiseeq_rx_desc *rd;
 311         struct sk_buff *skb = 0;
 312         unsigned char pkt_status;
 313         unsigned char *pkt_pointer = 0;
 314         int len = 0;
 315         unsigned int orig_end = PREV_RX(sp->rx_new);
 316
 317         /* Service every received packet. */
 318         for_each_rx(rd, sp) {
 319                 len = (PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3);
 320                 pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
 321                 pkt_status = pkt_pointer[len + 2];
 322
 323                 if (pkt_status & SEEQ_RSTAT_FIG) {
 324                         /* Packet is OK. */
 325                         skb = dev_alloc_skb(len + 2);
 326
 327                         if (skb) {
 328                                 skb->dev = dev;
 329                                 skb_reserve(skb, 2);
 330                                 skb_put(skb, len);
 331
 332                                 /* Copy out of kseg1 to avoid silly cache flush. */
 333                                 eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
 334                                 skb->protocol = eth_type_trans(skb, dev);
 335                                 netif_rx(skb);
 336                                 dev->last_rx = jiffies;
 337                                 sp->stats.rx_packets++;
 338                                 sp->stats.rx_bytes += len;
 339                         } else {
 340                                 printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
 341                                         dev->name);
 342                                 sp->stats.rx_dropped++;
 343                         }
 344                 } else {
 345                         record_rx_errors(sp, pkt_status);
 346                 }
 347
 348                 /* Return the entry to the ring pool. */
 349                 rd->rdma.cntinfo = (RCNTINFO_INIT);
 350                 sp->rx_new = NEXT_RX(sp->rx_new);
 351         }
 352         sp->srings.rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
 353         sp->srings.rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
 354         rx_maybe_restart(sp, hregs, sregs);
 355 }
 356
 357 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
 358                                              struct sgiseeq_regs *sregs)
 359 {
 360         if (sp->is_edlc) {
 361                 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
 362                 sregs->rw.wregs.control = sp->control;
 363         }
 364 }
 365
 366 static inline void kick_tx(struct sgiseeq_tx_desc *td,
 367                            struct hpc3_ethregs *hregs)
 368 {
 369         /* If the HPC aint doin nothin, and there are more packets
 370          * with ETXD cleared and XIU set we must make very certain
 371          * that we restart the HPC else we risk locking up the
 372          * adapter.  The following code is only safe iff the HPCDMA
 373          * is not active!
 374          */
 375         while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
 376               (HPCDMA_XIU | HPCDMA_ETXD))
 377                 td = (struct sgiseeq_tx_desc *)(long) KSEG1ADDR(td->tdma.pnext);
 378         if (td->tdma.cntinfo & HPCDMA_XIU) {
 379                 hregs->tx_ndptr = PHYSADDR(td);
 380                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 381         }
 382 }
 383
 384 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
 385                               struct hpc3_ethregs *hregs,
 386                               struct sgiseeq_regs *sregs)
 387 {
 388         struct sgiseeq_tx_desc *td;
 389         unsigned long status = hregs->tx_ctrl;
 390         int j;
 391
 392         tx_maybe_reset_collisions(sp, sregs);
 393
 394         if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
 395                 /* Oops, HPC detected some sort of error. */
 396                 if (status & SEEQ_TSTAT_R16)
 397                         sp->stats.tx_aborted_errors++;
 398                 if (status & SEEQ_TSTAT_UFLOW)
 399                         sp->stats.tx_fifo_errors++;
 400                 if (status & SEEQ_TSTAT_LCLS)
 401                         sp->stats.collisions++;
 402         }
 403
 404         /* Ack 'em... */
 405         for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
 406                 td = &sp->srings.tx_desc[j];
 407
 408                 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
 409                         break;
 410                 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
 411                         if (!(status & HPC3_ETXCTRL_ACTIVE)) {
 412                                 hregs->tx_ndptr = PHYSADDR(td);
 413                                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 414                         }
 415                         break;
 416                 }
 417                 sp->stats.tx_packets++;
 418                 sp->tx_old = NEXT_TX(sp->tx_old);
 419                 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
 420                 td->tdma.cntinfo |= HPCDMA_EOX;
 421         }
 422 }
 423
 424 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 425 {
 426         struct net_device *dev = (struct net_device *) dev_id;
 427         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 428         struct hpc3_ethregs *hregs = sp->hregs;
 429         struct sgiseeq_regs *sregs = sp->sregs;
 430
 431         spin_lock(&sp->tx_lock);
 432
 433         /* Ack the IRQ and set software state. */
 434         hregs->rx_reset = HPC3_ERXRST_CLRIRQ;
 435
 436         /* Always check for received packets. */
 437         sgiseeq_rx(dev, sp, hregs, sregs);
 438
 439         /* Only check for tx acks if we have something queued. */
 440         if (sp->tx_old != sp->tx_new)
 441                 sgiseeq_tx(dev, sp, hregs, sregs);
 442
 443         if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
 444                 netif_wake_queue(dev);
 445         }
 446         spin_unlock(&sp->tx_lock);
 447
 448         return IRQ_HANDLED;
 449 }
 450
 451 static int sgiseeq_open(struct net_device *dev)
 452 {
 453         struct sgiseeq_private *sp = (struct sgiseeq_private *)dev->priv;
 454         struct sgiseeq_regs *sregs = sp->sregs;
 455
 456         int err = init_seeq(dev, sp, sregs);
 457         if (err)
 458                 return err;
 459
 460         netif_start_queue(dev);
 461
 462         return 0;
 463 }
 464
 465 static int sgiseeq_close(struct net_device *dev)
 466 {
 467         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 468         struct sgiseeq_regs *sregs = sp->sregs;
 469
 470         netif_stop_queue(dev);
 471
 472         /* Shutdown the Seeq. */
 473         reset_hpc3_and_seeq(sp->hregs, sregs);
 474
 475         return 0;
 476 }
 477
 478 static inline int sgiseeq_reset(struct net_device *dev)
 479 {
 480         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 481         struct sgiseeq_regs *sregs = sp->sregs;
 482         int err;
 483
 484         err = init_seeq(dev, sp, sregs);
 485         if (err)
 486                 return err;
 487
 488         dev->trans_start = jiffies;
 489         netif_wake_queue(dev);
 490
 491         return 0;
 492 }
 493
 494 void sgiseeq_my_reset(void)
 495 {
 496         printk("RESET!\n");
 497         sgiseeq_reset(gdev);
 498 }
 499
 500 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
 501 {
 502         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 503         struct hpc3_ethregs *hregs = sp->hregs;
 504         unsigned long flags;
 505         struct sgiseeq_tx_desc *td;
 506         int skblen, len, entry;
 507
 508         spin_lock_irqsave(&sp->tx_lock, flags);
 509
 510         /* Setup... */
 511         skblen = skb->len;
 512         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 513         sp->stats.tx_bytes += len;
 514         entry = sp->tx_new;
 515         td = &sp->srings.tx_desc[entry];
 516
 517         /* Create entry.  There are so many races with adding a new
 518          * descriptor to the chain:
 519          * 1) Assume that the HPC is off processing a DMA chain while
 520          *    we are changing all of the following.
 521          * 2) Do no allow the HPC to look at a new descriptor until
 522          *    we have completely set up it's state.  This means, do
 523          *    not clear HPCDMA_EOX in the current last descritptor
 524          *    until the one we are adding looks consistent and could
 525          *    be processes right now.
 526          * 3) The tx interrupt code must notice when we've added a new
 527          *    entry and the HPC got to the end of the chain before we
 528          *    added this new entry and restarted it.
 529          */
 530         memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);
 531         if (len != skblen)
 532                 memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);
 533         td->tdma.cntinfo = (len & HPCDMA_BCNT) |
 534                            (HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX);
 535         if (sp->tx_old != sp->tx_new) {
 536                 struct sgiseeq_tx_desc *backend;
 537
 538                 backend = &sp->srings.tx_desc[PREV_TX(sp->tx_new)];
 539                 backend->tdma.cntinfo &= ~(HPCDMA_EOX);
 540         }
 541         sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
 542
 543         /* Maybe kick the HPC back into motion. */
 544         if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
 545                 kick_tx(&sp->srings.tx_desc[sp->tx_old], hregs);
 546
 547         dev->trans_start = jiffies;
 548         dev_kfree_skb(skb);
 549
 550         if (!TX_BUFFS_AVAIL(sp))
 551                 netif_stop_queue(dev);
 552         spin_unlock_irqrestore(&sp->tx_lock, flags);
 553
 554         return 0;
 555 }
 556
 557 static void timeout(struct net_device *dev)
 558 {
 559         printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
 560         sgiseeq_reset(dev);
 561
 562         dev->trans_start = jiffies;
 563         netif_wake_queue(dev);
 564 }
 565
 566 static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)
 567 {
 568         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 569
 570         return &sp->stats;
 571 }
 572
 573 static void sgiseeq_set_multicast(struct net_device *dev)
 574 {
 575 }
 576
 577 static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
 578 {
 579         int i = 0;
 580
 581         while (i < (nbufs - 1)) {
 582                 buf[i].tdma.pnext = PHYSADDR(&buf[i + 1]);
 583                 buf[i].tdma.pbuf = 0;
 584                 i++;
 585         }
 586         buf[i].tdma.pnext = PHYSADDR(&buf[0]);
 587 }
 588
 589 static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
 590 {
 591         int i = 0;
 592
 593         while (i < (nbufs - 1)) {
 594                 buf[i].rdma.pnext = PHYSADDR(&buf[i + 1]);
 595                 buf[i].rdma.pbuf = 0;
 596                 i++;
 597         }
 598         buf[i].rdma.pbuf = 0;
 599         buf[i].rdma.pnext = PHYSADDR(&buf[0]);
 600 }
 601
 602 #define ALIGNED(x)  ((((unsigned long)(x)) + 0xf) & ~(0xf))
 603
 604 int sgiseeq_init(struct hpc3_regs* regs, int irq)
 605 {
 606         struct net_device *dev;
 607         struct sgiseeq_private *sp;
 608         int err, i;
 609
 610         dev = alloc_etherdev(sizeof(struct sgiseeq_private));
 611         if (!dev) {
 612                 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
 613                 err = -ENOMEM;
 614                 goto err_out;
 615         }
 616
 617         sp = dev->priv;
 618
 619         if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
 620                 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
 621                 err = -EAGAIN;
 622                 goto err_out_free_dev;
 623         }
 624
 625         printk(KERN_INFO "%s: SGI Seeq8003 ", dev->name);
 626
 627 #define EADDR_NVOFS     250
 628         for (i = 0; i < 3; i++) {
 629                 unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i);
 630
 631                 printk("%2.2x:%2.2x%c",
 632                         dev->dev_addr[2 * i]     = tmp >> 8,
 633                         dev->dev_addr[2 * i + 1] = tmp & 0xff,
 634                         i == 2 ? ' ' : ':');
 635         }
 636         printk("\n");
 637
 638 #ifdef DEBUG
 639         gpriv = sp;
 640         gdev = dev;
 641 #endif
 642         sp->sregs = (struct sgiseeq_regs *) &hpc3c0->eth_ext[0];
 643         sp->hregs = &hpc3c0->ethregs;
 644         sp->name = sgiseeqstr;
 645
 646         sp->srings.rx_desc = (struct sgiseeq_rx_desc *)
 647                              (KSEG1ADDR(ALIGNED(&sp->srings.rxvector[0])));
 648         dma_cache_wback_inv((unsigned long)&sp->srings.rxvector,
 649                             sizeof(sp->srings.rxvector));
 650         sp->srings.tx_desc = (struct sgiseeq_tx_desc *)
 651                              (KSEG1ADDR(ALIGNED(&sp->srings.txvector[0])));
 652         dma_cache_wback_inv((unsigned long)&sp->srings.txvector,
 653                             sizeof(sp->srings.txvector));
 654
 655         /* A couple calculations now, saves many cycles later. */
 656         setup_rx_ring(sp->srings.rx_desc, SEEQ_RX_BUFFERS);
 657         setup_tx_ring(sp->srings.tx_desc, SEEQ_TX_BUFFERS);
 658
 659         /* Reset the chip. */
 660         hpc3_eth_reset(sp->hregs);
 661
 662         sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
 663         if (sp->is_edlc)
 664                 sp->control = (SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
 665                                SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
 666                                SEEQ_CTRL_ENCARR);
 667
 668         dev->open                 = sgiseeq_open;
 669         dev->stop                 = sgiseeq_close;
 670         dev->hard_start_xmit      = sgiseeq_start_xmit;
 671         dev->tx_timeout           = timeout;
 672         dev->watchdog_timeo       = (200 * HZ) / 1000;
 673         dev->get_stats            = sgiseeq_get_stats;
 674         dev->set_multicast_list   = sgiseeq_set_multicast;
 675         dev->irq                  = irq;
 676         dev->dma                  = 0;
 677
 678         if (register_netdev(dev)) {
 679                 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
 680                        "aborting.\n");
 681                 err = -ENODEV;
 682                 goto err_out_free_irq;
 683         }
 684
 685         sp->next_module = root_sgiseeq_dev;
 686         root_sgiseeq_dev = dev;
 687
 688         return 0;
 689
 690 err_out_free_irq:
 691         free_irq(irq, dev);
 692
 693 err_out_free_dev:
 694         kfree(dev);
 695
 696 err_out:
 697         return err;
 698 }
 699
 700 static int __init sgiseeq_probe(void)
 701 {
 702         printk(version);
 703
 704         /* On board adapter on 1st HPC is always present */
 705         return sgiseeq_init(hpc3c0, SGI_ENET_IRQ);
 706 }
 707
 708 static void __exit sgiseeq_exit(void)
 709 {
 710         struct net_device *next, *dev;
 711         struct sgiseeq_private *sp;
 712         int irq;
 713
 714         for (dev = root_sgiseeq_dev; dev; dev = next) {
 715                 sp = (struct sgiseeq_private *) dev->priv;
 716                 next = sp->next_module;
 717                 irq = dev->irq;
 718                 unregister_netdev(dev);
 719                 free_irq(irq, dev);
 720                 kfree(dev);
 721         }
 722 }
 723
 724 module_init(sgiseeq_probe);
 725 module_exit(sgiseeq_exit);
 726
 727 MODULE_LICENSE("GPL");