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         volatile struct hpc_dma_desc rdma;
  68         volatile signed int buf_vaddr;
  69 };
  70
  71 struct sgiseeq_tx_desc {
  72         volatile struct hpc_dma_desc tdma;
  73         volatile 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         struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
  83         struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
  84 };
  85
  86 struct sgiseeq_private {
  87         struct sgiseeq_init_block *srings;
  88
  89         /* Ptrs to the descriptors in uncached space. */
  90         struct sgiseeq_rx_desc *rx_desc;
  91         struct sgiseeq_tx_desc *tx_desc;
  92
  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 = netdev_priv(dev);
 156         int i;
 157
 158         netif_stop_queue(dev);
 159         sp->rx_new = sp->tx_new = 0;
 160         sp->rx_old = sp->tx_old = 0;
 161
 162         seeq_load_eaddr(dev, sp->sregs);
 163
 164         /* XXX for now just accept packets directly to us
 165          * XXX and ether-broadcast.  Will do multicast and
 166          * XXX promiscuous mode later. -davem
 167          */
 168         sp->mode = SEEQ_RCMD_RBCAST;
 169
 170         /* Setup tx ring. */
 171         for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
 172                 if (!sp->tx_desc[i].tdma.pbuf) {
 173                         unsigned long buffer;
 174
 175                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 176                         if (!buffer)
 177                                 return -ENOMEM;
 178                         sp->tx_desc[i].buf_vaddr = KSEG1ADDR(buffer);
 179                         sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer);
 180                 }
 181                 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
 182         }
 183
 184         /* And now the rx ring. */
 185         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 186                 if (!sp->rx_desc[i].rdma.pbuf) {
 187                         unsigned long buffer;
 188
 189                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 190                         if (!buffer)
 191                                 return -ENOMEM;
 192                         sp->rx_desc[i].buf_vaddr = KSEG1ADDR(buffer);
 193                         sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer);
 194                 }
 195                 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
 196         }
 197         sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
 198         return 0;
 199 }
 200
 201 #ifdef DEBUG
 202 static struct sgiseeq_private *gpriv;
 203 static struct net_device *gdev;
 204
 205 void sgiseeq_dump_rings(void)
 206 {
 207         static int once;
 208         struct sgiseeq_rx_desc *r = gpriv->rx_desc;
 209         struct sgiseeq_tx_desc *t = gpriv->tx_desc;
 210         struct hpc3_ethregs *hregs = gpriv->hregs;
 211         int i;
 212
 213         if (once)
 214                 return;
 215         once++;
 216         printk("RING DUMP:\n");
 217         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 218                 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
 219                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 220                        r[i].rdma.pnext);
 221                 i += 1;
 222                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 223                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 224                        r[i].rdma.pnext);
 225         }
 226         for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
 227                 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
 228                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 229                        t[i].tdma.pnext);
 230                 i += 1;
 231                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 232                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 233                        t[i].tdma.pnext);
 234         }
 235         printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
 236                gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
 237         printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
 238                hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
 239         printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
 240                hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
 241 }
 242 #endif
 243
 244 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
 245 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
 246 #define RDMACFG_INIT    (HPC3_ERXDCFG_FRXDC | HPC3_ERXDCFG_FEOP | HPC3_ERXDCFG_FIRQ)
 247
 248 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
 249                      struct sgiseeq_regs *sregs)
 250 {
 251         struct hpc3_ethregs *hregs = sp->hregs;
 252         int err;
 253
 254         reset_hpc3_and_seeq(hregs, sregs);
 255         err = seeq_init_ring(dev);
 256         if (err)
 257                 return err;
 258
 259         /* Setup to field the proper interrupt types. */
 260         if (sp->is_edlc) {
 261                 sregs->tstat = TSTAT_INIT_EDLC;
 262                 sregs->rw.wregs.control = sp->control;
 263                 sregs->rw.wregs.frame_gap = 0;
 264         } else {
 265                 sregs->tstat = TSTAT_INIT_SEEQ;
 266         }
 267
 268         hregs->rx_dconfig |= RDMACFG_INIT;
 269
 270         hregs->rx_ndptr = CPHYSADDR(sp->rx_desc);
 271         hregs->tx_ndptr = CPHYSADDR(sp->tx_desc);
 272
 273         seeq_go(sp, hregs, sregs);
 274         return 0;
 275 }
 276
 277 static inline void record_rx_errors(struct sgiseeq_private *sp,
 278                                     unsigned char status)
 279 {
 280         if (status & SEEQ_RSTAT_OVERF ||
 281             status & SEEQ_RSTAT_SFRAME)
 282                 sp->stats.rx_over_errors++;
 283         if (status & SEEQ_RSTAT_CERROR)
 284                 sp->stats.rx_crc_errors++;
 285         if (status & SEEQ_RSTAT_DERROR)
 286                 sp->stats.rx_frame_errors++;
 287         if (status & SEEQ_RSTAT_REOF)
 288                 sp->stats.rx_errors++;
 289 }
 290
 291 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
 292                                     struct hpc3_ethregs *hregs,
 293                                     struct sgiseeq_regs *sregs)
 294 {
 295         if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
 296                 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new);
 297                 seeq_go(sp, hregs, sregs);
 298         }
 299 }
 300
 301 #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \
 302                                 !((rd)->rdma.cntinfo & HPCDMA_OWN); \
 303                                 (rd) = &(sp)->rx_desc[(sp)->rx_new])
 304
 305 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
 306                               struct hpc3_ethregs *hregs,
 307                               struct sgiseeq_regs *sregs)
 308 {
 309         struct sgiseeq_rx_desc *rd;
 310         struct sk_buff *skb = 0;
 311         unsigned char pkt_status;
 312         unsigned char *pkt_pointer = 0;
 313         int len = 0;
 314         unsigned int orig_end = PREV_RX(sp->rx_new);
 315
 316         /* Service every received packet. */
 317         for_each_rx(rd, sp) {
 318                 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
 319                 pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
 320                 pkt_status = pkt_pointer[len + 2];
 321
 322                 if (pkt_status & SEEQ_RSTAT_FIG) {
 323                         /* Packet is OK. */
 324                         skb = dev_alloc_skb(len + 2);
 325
 326                         if (skb) {
 327                                 skb->dev = dev;
 328                                 skb_reserve(skb, 2);
 329                                 skb_put(skb, len);
 330
 331                                 /* Copy out of kseg1 to avoid silly cache flush. */
 332                                 eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
 333                                 skb->protocol = eth_type_trans(skb, dev);
 334                                 netif_rx(skb);
 335                                 dev->last_rx = jiffies;
 336                                 sp->stats.rx_packets++;
 337                                 sp->stats.rx_bytes += len;
 338                         } else {
 339                                 printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
 340                                         dev->name);
 341                                 sp->stats.rx_dropped++;
 342                         }
 343                 } else {
 344                         record_rx_errors(sp, pkt_status);
 345                 }
 346
 347                 /* Return the entry to the ring pool. */
 348                 rd->rdma.cntinfo = RCNTINFO_INIT;
 349                 sp->rx_new = NEXT_RX(sp->rx_new);
 350         }
 351         sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
 352         sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
 353         rx_maybe_restart(sp, hregs, sregs);
 354 }
 355
 356 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
 357                                              struct sgiseeq_regs *sregs)
 358 {
 359         if (sp->is_edlc) {
 360                 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
 361                 sregs->rw.wregs.control = sp->control;
 362         }
 363 }
 364
 365 static inline void kick_tx(struct sgiseeq_tx_desc *td,
 366                            struct hpc3_ethregs *hregs)
 367 {
 368         /* If the HPC aint doin nothin, and there are more packets
 369          * with ETXD cleared and XIU set we must make very certain
 370          * that we restart the HPC else we risk locking up the
 371          * adapter.  The following code is only safe iff the HPCDMA
 372          * is not active!
 373          */
 374         while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
 375               (HPCDMA_XIU | HPCDMA_ETXD))
 376                 td = (struct sgiseeq_tx_desc *)(long) KSEG1ADDR(td->tdma.pnext);
 377         if (td->tdma.cntinfo & HPCDMA_XIU) {
 378                 hregs->tx_ndptr = CPHYSADDR(td);
 379                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 380         }
 381 }
 382
 383 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
 384                               struct hpc3_ethregs *hregs,
 385                               struct sgiseeq_regs *sregs)
 386 {
 387         struct sgiseeq_tx_desc *td;
 388         unsigned long status = hregs->tx_ctrl;
 389         int j;
 390
 391         tx_maybe_reset_collisions(sp, sregs);
 392
 393         if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
 394                 /* Oops, HPC detected some sort of error. */
 395                 if (status & SEEQ_TSTAT_R16)
 396                         sp->stats.tx_aborted_errors++;
 397                 if (status & SEEQ_TSTAT_UFLOW)
 398                         sp->stats.tx_fifo_errors++;
 399                 if (status & SEEQ_TSTAT_LCLS)
 400                         sp->stats.collisions++;
 401         }
 402
 403         /* Ack 'em... */
 404         for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
 405                 td = &sp->tx_desc[j];
 406
 407                 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
 408                         break;
 409                 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
 410                         if (!(status & HPC3_ETXCTRL_ACTIVE)) {
 411                                 hregs->tx_ndptr = CPHYSADDR(td);
 412                                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 413                         }
 414                         break;
 415                 }
 416                 sp->stats.tx_packets++;
 417                 sp->tx_old = NEXT_TX(sp->tx_old);
 418                 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
 419                 td->tdma.cntinfo |= HPCDMA_EOX;
 420         }
 421 }
 422
 423 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 424 {
 425         struct net_device *dev = (struct net_device *) dev_id;
 426         struct sgiseeq_private *sp = netdev_priv(dev);
 427         struct hpc3_ethregs *hregs = sp->hregs;
 428         struct sgiseeq_regs *sregs = sp->sregs;
 429
 430         spin_lock(&sp->tx_lock);
 431
 432         /* Ack the IRQ and set software state. */
 433         hregs->rx_reset = HPC3_ERXRST_CLRIRQ;
 434
 435         /* Always check for received packets. */
 436         sgiseeq_rx(dev, sp, hregs, sregs);
 437
 438         /* Only check for tx acks if we have something queued. */
 439         if (sp->tx_old != sp->tx_new)
 440                 sgiseeq_tx(dev, sp, hregs, sregs);
 441
 442         if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
 443                 netif_wake_queue(dev);
 444         }
 445         spin_unlock(&sp->tx_lock);
 446
 447         return IRQ_HANDLED;
 448 }
 449
 450 static int sgiseeq_open(struct net_device *dev)
 451 {
 452         struct sgiseeq_private *sp = netdev_priv(dev);
 453         struct sgiseeq_regs *sregs = sp->sregs;
 454         unsigned int irq = dev->irq;
 455         int err;
 456
 457         if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
 458                 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
 459                 err = -EAGAIN;
 460         }
 461
 462         err = init_seeq(dev, sp, sregs);
 463         if (err)
 464                 goto out_free_irq;
 465
 466         netif_start_queue(dev);
 467
 468         return 0;
 469
 470 out_free_irq:
 471         free_irq(irq, dev);
 472
 473         return err;
 474 }
 475
 476 static int sgiseeq_close(struct net_device *dev)
 477 {
 478         struct sgiseeq_private *sp = netdev_priv(dev);
 479         struct sgiseeq_regs *sregs = sp->sregs;
 480
 481         netif_stop_queue(dev);
 482
 483         /* Shutdown the Seeq. */
 484         reset_hpc3_and_seeq(sp->hregs, sregs);
 485
 486         return 0;
 487 }
 488
 489 static inline int sgiseeq_reset(struct net_device *dev)
 490 {
 491         struct sgiseeq_private *sp = netdev_priv(dev);
 492         struct sgiseeq_regs *sregs = sp->sregs;
 493         int err;
 494
 495         err = init_seeq(dev, sp, sregs);
 496         if (err)
 497                 return err;
 498
 499         dev->trans_start = jiffies;
 500         netif_wake_queue(dev);
 501
 502         return 0;
 503 }
 504
 505 void sgiseeq_my_reset(void)
 506 {
 507         printk("RESET!\n");
 508         sgiseeq_reset(gdev);
 509 }
 510
 511 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
 512 {
 513         struct sgiseeq_private *sp = netdev_priv(dev);
 514         struct hpc3_ethregs *hregs = sp->hregs;
 515         unsigned long flags;
 516         struct sgiseeq_tx_desc *td;
 517         int skblen, len, entry;
 518
 519         spin_lock_irqsave(&sp->tx_lock, flags);
 520
 521         /* Setup... */
 522         skblen = skb->len;
 523         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 524         sp->stats.tx_bytes += len;
 525         entry = sp->tx_new;
 526         td = &sp->tx_desc[entry];
 527
 528         /* Create entry.  There are so many races with adding a new
 529          * descriptor to the chain:
 530          * 1) Assume that the HPC is off processing a DMA chain while
 531          *    we are changing all of the following.
 532          * 2) Do no allow the HPC to look at a new descriptor until
 533          *    we have completely set up it's state.  This means, do
 534          *    not clear HPCDMA_EOX in the current last descritptor
 535          *    until the one we are adding looks consistent and could
 536          *    be processes right now.
 537          * 3) The tx interrupt code must notice when we've added a new
 538          *    entry and the HPC got to the end of the chain before we
 539          *    added this new entry and restarted it.
 540          */
 541         memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);
 542         if (len != skblen)
 543                 memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);
 544         td->tdma.cntinfo = (len & HPCDMA_BCNT) |
 545                            HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
 546         if (sp->tx_old != sp->tx_new) {
 547                 struct sgiseeq_tx_desc *backend;
 548
 549                 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
 550                 backend->tdma.cntinfo &= ~HPCDMA_EOX;
 551         }
 552         sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
 553
 554         /* Maybe kick the HPC back into motion. */
 555         if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
 556                 kick_tx(&sp->tx_desc[sp->tx_old], hregs);
 557
 558         dev->trans_start = jiffies;
 559         dev_kfree_skb(skb);
 560
 561         if (!TX_BUFFS_AVAIL(sp))
 562                 netif_stop_queue(dev);
 563         spin_unlock_irqrestore(&sp->tx_lock, flags);
 564
 565         return 0;
 566 }
 567
 568 static void timeout(struct net_device *dev)
 569 {
 570         printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
 571         sgiseeq_reset(dev);
 572
 573         dev->trans_start = jiffies;
 574         netif_wake_queue(dev);
 575 }
 576
 577 static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)
 578 {
 579         struct sgiseeq_private *sp = netdev_priv(dev);
 580
 581         return &sp->stats;
 582 }
 583
 584 static void sgiseeq_set_multicast(struct net_device *dev)
 585 {
 586 }
 587
 588 static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
 589 {
 590         int i = 0;
 591
 592         while (i < (nbufs - 1)) {
 593                 buf[i].tdma.pnext = CPHYSADDR(buf + i + 1);
 594                 buf[i].tdma.pbuf = 0;
 595                 i++;
 596         }
 597         buf[i].tdma.pnext = CPHYSADDR(buf);
 598 }
 599
 600 static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
 601 {
 602         int i = 0;
 603
 604         while (i < (nbufs - 1)) {
 605                 buf[i].rdma.pnext = CPHYSADDR(buf + i + 1);
 606                 buf[i].rdma.pbuf = 0;
 607                 i++;
 608         }
 609         buf[i].rdma.pbuf = 0;
 610         buf[i].rdma.pnext = CPHYSADDR(buf);
 611 }
 612
 613 #define ALIGNED(x)  ((((unsigned long)(x)) + 0xf) & ~(0xf))
 614
 615 static int sgiseeq_init(struct hpc3_regs* regs, int irq)
 616 {
 617         struct sgiseeq_init_block *sr;
 618         struct sgiseeq_private *sp;
 619         struct net_device *dev;
 620         int err, i;
 621
 622         dev = alloc_etherdev(sizeof (struct sgiseeq_private));
 623         if (!dev) {
 624                 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
 625                 err = -ENOMEM;
 626                 goto err_out;
 627         }
 628         sp = netdev_priv(dev);
 629
 630         /* Make private data page aligned */
 631         sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL);
 632         if (!sr) {
 633                 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
 634                 err = -ENOMEM;
 635                 goto err_out_free_dev;
 636         }
 637         sp->srings = sr;
 638
 639 #define EADDR_NVOFS     250
 640         for (i = 0; i < 3; i++) {
 641                 unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i);
 642
 643                 dev->dev_addr[2 * i]     = tmp >> 8;
 644                 dev->dev_addr[2 * i + 1] = tmp & 0xff;
 645         }
 646
 647 #ifdef DEBUG
 648         gpriv = sp;
 649         gdev = dev;
 650 #endif
 651         sp->sregs = (struct sgiseeq_regs *) &hpc3c0->eth_ext[0];
 652         sp->hregs = &hpc3c0->ethregs;
 653         sp->name = sgiseeqstr;
 654
 655         sp->rx_desc = (struct sgiseeq_rx_desc *)
 656                       KSEG1ADDR(ALIGNED(&sp->srings->rxvector[0]));
 657         dma_cache_wback_inv((unsigned long)&sp->srings->rxvector,
 658                             sizeof(sp->srings->rxvector));
 659         sp->tx_desc = (struct sgiseeq_tx_desc *)
 660                       KSEG1ADDR(ALIGNED(&sp->srings->txvector[0]));
 661         dma_cache_wback_inv((unsigned long)&sp->srings->txvector,
 662                             sizeof(sp->srings->txvector));
 663
 664         /* A couple calculations now, saves many cycles later. */
 665         setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS);
 666         setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS);
 667
 668         /* Reset the chip. */
 669         hpc3_eth_reset(sp->hregs);
 670
 671         sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
 672         if (sp->is_edlc)
 673                 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
 674                               SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
 675                               SEEQ_CTRL_ENCARR;
 676
 677         dev->open               = sgiseeq_open;
 678         dev->stop               = sgiseeq_close;
 679         dev->hard_start_xmit    = sgiseeq_start_xmit;
 680         dev->tx_timeout         = timeout;
 681         dev->watchdog_timeo     = (200 * HZ) / 1000;
 682         dev->get_stats          = sgiseeq_get_stats;
 683         dev->set_multicast_list = sgiseeq_set_multicast;
 684         dev->irq                = irq;
 685
 686         if (register_netdev(dev)) {
 687                 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
 688                        "aborting.\n");
 689                 err = -ENODEV;
 690                 goto err_out_free_page;
 691         }
 692
 693         printk(KERN_INFO "%s: SGI Seeq8003 ", dev->name);
 694         for (i = 0; i < 6; i++)
 695                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 696
 697         sp->next_module = root_sgiseeq_dev;
 698         root_sgiseeq_dev = dev;
 699
 700         return 0;
 701
 702 err_out_free_page:
 703         free_page((unsigned long) sp);
 704 err_out_free_dev:
 705         kfree(dev);
 706
 707 err_out:
 708         return err;
 709 }
 710
 711 static int __init sgiseeq_probe(void)
 712 {
 713         printk(version);
 714
 715         /* On board adapter on 1st HPC is always present */
 716         return sgiseeq_init(hpc3c0, SGI_ENET_IRQ);
 717 }
 718
 719 static void __exit sgiseeq_exit(void)
 720 {
 721         struct net_device *next, *dev;
 722         struct sgiseeq_private *sp;
 723         int irq;
 724
 725         for (dev = root_sgiseeq_dev; dev; dev = next) {
 726                 sp = (struct sgiseeq_private *) netdev_priv(dev);
 727                 next = sp->next_module;
 728                 irq = dev->irq;
 729                 unregister_netdev(dev);
 730                 free_irq(irq, dev);
 731                 free_page((unsigned long) sp);
 732                 free_netdev(dev);
 733         }
 734 }
 735
 736 module_init(sgiseeq_probe);
 737 module_exit(sgiseeq_exit);
 738
 739 MODULE_LICENSE("GPL");