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 #include <linux/bitops.h>
  23
  24 #include <asm/byteorder.h>
  25 #include <asm/io.h>
  26 #include <asm/system.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 __sgiseeq_set_mac_address(struct net_device *dev)
 140 {
 141         struct sgiseeq_private *sp = netdev_priv(dev);
 142         struct sgiseeq_regs *sregs = sp->sregs;
 143         int i;
 144
 145         sregs->tstat = SEEQ_TCMD_RB0;
 146         for (i = 0; i < 6; i++)
 147                 sregs->rw.eth_addr[i] = dev->dev_addr[i];
 148 }
 149
 150 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
 151 {
 152         struct sgiseeq_private *sp = netdev_priv(dev);
 153         struct sockaddr *sa = addr;
 154
 155         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 156
 157         spin_lock_irq(&sp->tx_lock);
 158         __sgiseeq_set_mac_address(dev);
 159         spin_unlock_irq(&sp->tx_lock);
 160
 161         return 0;
 162 }
 163
 164 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
 165 #define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
 166 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
 167
 168 static int seeq_init_ring(struct net_device *dev)
 169 {
 170         struct sgiseeq_private *sp = netdev_priv(dev);
 171         int i;
 172
 173         netif_stop_queue(dev);
 174         sp->rx_new = sp->tx_new = 0;
 175         sp->rx_old = sp->tx_old = 0;
 176
 177         __sgiseeq_set_mac_address(dev);
 178
 179         /* Setup tx ring. */
 180         for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
 181                 if (!sp->tx_desc[i].tdma.pbuf) {
 182                         unsigned long buffer;
 183
 184                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 185                         if (!buffer)
 186                                 return -ENOMEM;
 187                         sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
 188                         sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer);
 189                 }
 190                 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
 191         }
 192
 193         /* And now the rx ring. */
 194         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 195                 if (!sp->rx_desc[i].rdma.pbuf) {
 196                         unsigned long buffer;
 197
 198                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 199                         if (!buffer)
 200                                 return -ENOMEM;
 201                         sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
 202                         sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer);
 203                 }
 204                 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
 205         }
 206         sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
 207         return 0;
 208 }
 209
 210 #ifdef DEBUG
 211 static struct sgiseeq_private *gpriv;
 212 static struct net_device *gdev;
 213
 214 void sgiseeq_dump_rings(void)
 215 {
 216         static int once;
 217         struct sgiseeq_rx_desc *r = gpriv->rx_desc;
 218         struct sgiseeq_tx_desc *t = gpriv->tx_desc;
 219         struct hpc3_ethregs *hregs = gpriv->hregs;
 220         int i;
 221
 222         if (once)
 223                 return;
 224         once++;
 225         printk("RING DUMP:\n");
 226         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 227                 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
 228                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 229                        r[i].rdma.pnext);
 230                 i += 1;
 231                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 232                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 233                        r[i].rdma.pnext);
 234         }
 235         for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
 236                 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
 237                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 238                        t[i].tdma.pnext);
 239                 i += 1;
 240                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 241                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 242                        t[i].tdma.pnext);
 243         }
 244         printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
 245                gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
 246         printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
 247                hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
 248         printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
 249                hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
 250 }
 251 #endif
 252
 253 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
 254 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
 255 #define RDMACFG_INIT    (HPC3_ERXDCFG_FRXDC | HPC3_ERXDCFG_FEOP | HPC3_ERXDCFG_FIRQ)
 256
 257 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
 258                      struct sgiseeq_regs *sregs)
 259 {
 260         struct hpc3_ethregs *hregs = sp->hregs;
 261         int err;
 262
 263         reset_hpc3_and_seeq(hregs, sregs);
 264         err = seeq_init_ring(dev);
 265         if (err)
 266                 return err;
 267
 268         /* Setup to field the proper interrupt types. */
 269         if (sp->is_edlc) {
 270                 sregs->tstat = TSTAT_INIT_EDLC;
 271                 sregs->rw.wregs.control = sp->control;
 272                 sregs->rw.wregs.frame_gap = 0;
 273         } else {
 274                 sregs->tstat = TSTAT_INIT_SEEQ;
 275         }
 276
 277         hregs->rx_dconfig |= RDMACFG_INIT;
 278
 279         hregs->rx_ndptr = CPHYSADDR(sp->rx_desc);
 280         hregs->tx_ndptr = CPHYSADDR(sp->tx_desc);
 281
 282         seeq_go(sp, hregs, sregs);
 283         return 0;
 284 }
 285
 286 static inline void record_rx_errors(struct sgiseeq_private *sp,
 287                                     unsigned char status)
 288 {
 289         if (status & SEEQ_RSTAT_OVERF ||
 290             status & SEEQ_RSTAT_SFRAME)
 291                 sp->stats.rx_over_errors++;
 292         if (status & SEEQ_RSTAT_CERROR)
 293                 sp->stats.rx_crc_errors++;
 294         if (status & SEEQ_RSTAT_DERROR)
 295                 sp->stats.rx_frame_errors++;
 296         if (status & SEEQ_RSTAT_REOF)
 297                 sp->stats.rx_errors++;
 298 }
 299
 300 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
 301                                     struct hpc3_ethregs *hregs,
 302                                     struct sgiseeq_regs *sregs)
 303 {
 304         if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
 305                 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new);
 306                 seeq_go(sp, hregs, sregs);
 307         }
 308 }
 309
 310 #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \
 311                                 !((rd)->rdma.cntinfo & HPCDMA_OWN); \
 312                                 (rd) = &(sp)->rx_desc[(sp)->rx_new])
 313
 314 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
 315                               struct hpc3_ethregs *hregs,
 316                               struct sgiseeq_regs *sregs)
 317 {
 318         struct sgiseeq_rx_desc *rd;
 319         struct sk_buff *skb = 0;
 320         unsigned char pkt_status;
 321         unsigned char *pkt_pointer = 0;
 322         int len = 0;
 323         unsigned int orig_end = PREV_RX(sp->rx_new);
 324
 325         /* Service every received packet. */
 326         for_each_rx(rd, sp) {
 327                 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
 328                 pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
 329                 pkt_status = pkt_pointer[len + 2];
 330
 331                 if (pkt_status & SEEQ_RSTAT_FIG) {
 332                         /* Packet is OK. */
 333                         skb = dev_alloc_skb(len + 2);
 334
 335                         if (skb) {
 336                                 skb->dev = dev;
 337                                 skb_reserve(skb, 2);
 338                                 skb_put(skb, len);
 339
 340                                 /* Copy out of kseg1 to avoid silly cache flush. */
 341                                 eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
 342                                 skb->protocol = eth_type_trans(skb, dev);
 343
 344                                 /* We don't want to receive our own packets */
 345                                 if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) {
 346                                         netif_rx(skb);
 347                                         dev->last_rx = jiffies;
 348                                         sp->stats.rx_packets++;
 349                                         sp->stats.rx_bytes += len;
 350                                 } else {
 351                                         /* Silently drop my own packets */
 352                                         dev_kfree_skb_irq(skb);
 353                                 }
 354                         } else {
 355                                 printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
 356                                         dev->name);
 357                                 sp->stats.rx_dropped++;
 358                         }
 359                 } else {
 360                         record_rx_errors(sp, pkt_status);
 361                 }
 362
 363                 /* Return the entry to the ring pool. */
 364                 rd->rdma.cntinfo = RCNTINFO_INIT;
 365                 sp->rx_new = NEXT_RX(sp->rx_new);
 366         }
 367         sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
 368         sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
 369         rx_maybe_restart(sp, hregs, sregs);
 370 }
 371
 372 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
 373                                              struct sgiseeq_regs *sregs)
 374 {
 375         if (sp->is_edlc) {
 376                 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
 377                 sregs->rw.wregs.control = sp->control;
 378         }
 379 }
 380
 381 static inline void kick_tx(struct sgiseeq_tx_desc *td,
 382                            struct hpc3_ethregs *hregs)
 383 {
 384         /* If the HPC aint doin nothin, and there are more packets
 385          * with ETXD cleared and XIU set we must make very certain
 386          * that we restart the HPC else we risk locking up the
 387          * adapter.  The following code is only safe iff the HPCDMA
 388          * is not active!
 389          */
 390         while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
 391               (HPCDMA_XIU | HPCDMA_ETXD))
 392                 td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext);
 393         if (td->tdma.cntinfo & HPCDMA_XIU) {
 394                 hregs->tx_ndptr = CPHYSADDR(td);
 395                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 396         }
 397 }
 398
 399 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
 400                               struct hpc3_ethregs *hregs,
 401                               struct sgiseeq_regs *sregs)
 402 {
 403         struct sgiseeq_tx_desc *td;
 404         unsigned long status = hregs->tx_ctrl;
 405         int j;
 406
 407         tx_maybe_reset_collisions(sp, sregs);
 408
 409         if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
 410                 /* Oops, HPC detected some sort of error. */
 411                 if (status & SEEQ_TSTAT_R16)
 412                         sp->stats.tx_aborted_errors++;
 413                 if (status & SEEQ_TSTAT_UFLOW)
 414                         sp->stats.tx_fifo_errors++;
 415                 if (status & SEEQ_TSTAT_LCLS)
 416                         sp->stats.collisions++;
 417         }
 418
 419         /* Ack 'em... */
 420         for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
 421                 td = &sp->tx_desc[j];
 422
 423                 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
 424                         break;
 425                 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
 426                         if (!(status & HPC3_ETXCTRL_ACTIVE)) {
 427                                 hregs->tx_ndptr = CPHYSADDR(td);
 428                                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 429                         }
 430                         break;
 431                 }
 432                 sp->stats.tx_packets++;
 433                 sp->tx_old = NEXT_TX(sp->tx_old);
 434                 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
 435                 td->tdma.cntinfo |= HPCDMA_EOX;
 436         }
 437 }
 438
 439 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 440 {
 441         struct net_device *dev = (struct net_device *) dev_id;
 442         struct sgiseeq_private *sp = netdev_priv(dev);
 443         struct hpc3_ethregs *hregs = sp->hregs;
 444         struct sgiseeq_regs *sregs = sp->sregs;
 445
 446         spin_lock(&sp->tx_lock);
 447
 448         /* Ack the IRQ and set software state. */
 449         hregs->rx_reset = HPC3_ERXRST_CLRIRQ;
 450
 451         /* Always check for received packets. */
 452         sgiseeq_rx(dev, sp, hregs, sregs);
 453
 454         /* Only check for tx acks if we have something queued. */
 455         if (sp->tx_old != sp->tx_new)
 456                 sgiseeq_tx(dev, sp, hregs, sregs);
 457
 458         if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
 459                 netif_wake_queue(dev);
 460         }
 461         spin_unlock(&sp->tx_lock);
 462
 463         return IRQ_HANDLED;
 464 }
 465
 466 static int sgiseeq_open(struct net_device *dev)
 467 {
 468         struct sgiseeq_private *sp = netdev_priv(dev);
 469         struct sgiseeq_regs *sregs = sp->sregs;
 470         unsigned int irq = dev->irq;
 471         int err;
 472
 473         if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
 474                 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
 475                 err = -EAGAIN;
 476         }
 477
 478         err = init_seeq(dev, sp, sregs);
 479         if (err)
 480                 goto out_free_irq;
 481
 482         netif_start_queue(dev);
 483
 484         return 0;
 485
 486 out_free_irq:
 487         free_irq(irq, dev);
 488
 489         return err;
 490 }
 491
 492 static int sgiseeq_close(struct net_device *dev)
 493 {
 494         struct sgiseeq_private *sp = netdev_priv(dev);
 495         struct sgiseeq_regs *sregs = sp->sregs;
 496
 497         netif_stop_queue(dev);
 498
 499         /* Shutdown the Seeq. */
 500         reset_hpc3_and_seeq(sp->hregs, sregs);
 501
 502         return 0;
 503 }
 504
 505 static inline int sgiseeq_reset(struct net_device *dev)
 506 {
 507         struct sgiseeq_private *sp = netdev_priv(dev);
 508         struct sgiseeq_regs *sregs = sp->sregs;
 509         int err;
 510
 511         err = init_seeq(dev, sp, sregs);
 512         if (err)
 513                 return err;
 514
 515         dev->trans_start = jiffies;
 516         netif_wake_queue(dev);
 517
 518         return 0;
 519 }
 520
 521 void sgiseeq_my_reset(void)
 522 {
 523         printk("RESET!\n");
 524         sgiseeq_reset(gdev);
 525 }
 526
 527 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
 528 {
 529         struct sgiseeq_private *sp = netdev_priv(dev);
 530         struct hpc3_ethregs *hregs = sp->hregs;
 531         unsigned long flags;
 532         struct sgiseeq_tx_desc *td;
 533         int skblen, len, entry;
 534
 535         spin_lock_irqsave(&sp->tx_lock, flags);
 536
 537         /* Setup... */
 538         skblen = skb->len;
 539         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 540         sp->stats.tx_bytes += len;
 541         entry = sp->tx_new;
 542         td = &sp->tx_desc[entry];
 543
 544         /* Create entry.  There are so many races with adding a new
 545          * descriptor to the chain:
 546          * 1) Assume that the HPC is off processing a DMA chain while
 547          *    we are changing all of the following.
 548          * 2) Do no allow the HPC to look at a new descriptor until
 549          *    we have completely set up it's state.  This means, do
 550          *    not clear HPCDMA_EOX in the current last descritptor
 551          *    until the one we are adding looks consistent and could
 552          *    be processes right now.
 553          * 3) The tx interrupt code must notice when we've added a new
 554          *    entry and the HPC got to the end of the chain before we
 555          *    added this new entry and restarted it.
 556          */
 557         memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);
 558         if (len != skblen)
 559                 memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);
 560         td->tdma.cntinfo = (len & HPCDMA_BCNT) |
 561                            HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
 562         if (sp->tx_old != sp->tx_new) {
 563                 struct sgiseeq_tx_desc *backend;
 564
 565                 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
 566                 backend->tdma.cntinfo &= ~HPCDMA_EOX;
 567         }
 568         sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
 569
 570         /* Maybe kick the HPC back into motion. */
 571         if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
 572                 kick_tx(&sp->tx_desc[sp->tx_old], hregs);
 573
 574         dev->trans_start = jiffies;
 575         dev_kfree_skb(skb);
 576
 577         if (!TX_BUFFS_AVAIL(sp))
 578                 netif_stop_queue(dev);
 579         spin_unlock_irqrestore(&sp->tx_lock, flags);
 580
 581         return 0;
 582 }
 583
 584 static void timeout(struct net_device *dev)
 585 {
 586         printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
 587         sgiseeq_reset(dev);
 588
 589         dev->trans_start = jiffies;
 590         netif_wake_queue(dev);
 591 }
 592
 593 static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)
 594 {
 595         struct sgiseeq_private *sp = netdev_priv(dev);
 596
 597         return &sp->stats;
 598 }
 599
 600 static void sgiseeq_set_multicast(struct net_device *dev)
 601 {
 602         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 603         unsigned char oldmode = sp->mode;
 604
 605         if(dev->flags & IFF_PROMISC)
 606                 sp->mode = SEEQ_RCMD_RANY;
 607         else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count)
 608                 sp->mode = SEEQ_RCMD_RBMCAST;
 609         else
 610                 sp->mode = SEEQ_RCMD_RBCAST;
 611
 612         /* XXX I know this sucks, but is there a better way to reprogram
 613          * XXX the receiver? At least, this shouldn't happen too often.
 614          */
 615
 616         if (oldmode != sp->mode)
 617                 sgiseeq_reset(dev);
 618 }
 619
 620 static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
 621 {
 622         int i = 0;
 623
 624         while (i < (nbufs - 1)) {
 625                 buf[i].tdma.pnext = CPHYSADDR(buf + i + 1);
 626                 buf[i].tdma.pbuf = 0;
 627                 i++;
 628         }
 629         buf[i].tdma.pnext = CPHYSADDR(buf);
 630 }
 631
 632 static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
 633 {
 634         int i = 0;
 635
 636         while (i < (nbufs - 1)) {
 637                 buf[i].rdma.pnext = CPHYSADDR(buf + i + 1);
 638                 buf[i].rdma.pbuf = 0;
 639                 i++;
 640         }
 641         buf[i].rdma.pbuf = 0;
 642         buf[i].rdma.pnext = CPHYSADDR(buf);
 643 }
 644
 645 #define ALIGNED(x)  ((((unsigned long)(x)) + 0xf) & ~(0xf))
 646
 647 static int sgiseeq_init(struct hpc3_regs* regs, int irq)
 648 {
 649         struct sgiseeq_init_block *sr;
 650         struct sgiseeq_private *sp;
 651         struct net_device *dev;
 652         int err, i;
 653
 654         dev = alloc_etherdev(sizeof (struct sgiseeq_private));
 655         if (!dev) {
 656                 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
 657                 err = -ENOMEM;
 658                 goto err_out;
 659         }
 660         sp = netdev_priv(dev);
 661
 662         /* Make private data page aligned */
 663         sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL);
 664         if (!sr) {
 665                 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
 666                 err = -ENOMEM;
 667                 goto err_out_free_dev;
 668         }
 669         sp->srings = sr;
 670
 671 #define EADDR_NVOFS     250
 672         for (i = 0; i < 3; i++) {
 673                 unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i);
 674
 675                 dev->dev_addr[2 * i]     = tmp >> 8;
 676                 dev->dev_addr[2 * i + 1] = tmp & 0xff;
 677         }
 678
 679 #ifdef DEBUG
 680         gpriv = sp;
 681         gdev = dev;
 682 #endif
 683         sp->sregs = (struct sgiseeq_regs *) &hpc3c0->eth_ext[0];
 684         sp->hregs = &hpc3c0->ethregs;
 685         sp->name = sgiseeqstr;
 686         sp->mode = SEEQ_RCMD_RBCAST;
 687
 688         sp->rx_desc = (struct sgiseeq_rx_desc *)
 689                       CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0]));
 690         dma_cache_wback_inv((unsigned long)&sp->srings->rxvector,
 691                             sizeof(sp->srings->rxvector));
 692         sp->tx_desc = (struct sgiseeq_tx_desc *)
 693                       CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0]));
 694         dma_cache_wback_inv((unsigned long)&sp->srings->txvector,
 695                             sizeof(sp->srings->txvector));
 696
 697         /* A couple calculations now, saves many cycles later. */
 698         setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS);
 699         setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS);
 700
 701         /* Reset the chip. */
 702         hpc3_eth_reset(sp->hregs);
 703
 704         sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
 705         if (sp->is_edlc)
 706                 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
 707                               SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
 708                               SEEQ_CTRL_ENCARR;
 709
 710         dev->open               = sgiseeq_open;
 711         dev->stop               = sgiseeq_close;
 712         dev->hard_start_xmit    = sgiseeq_start_xmit;
 713         dev->tx_timeout         = timeout;
 714         dev->watchdog_timeo     = (200 * HZ) / 1000;
 715         dev->get_stats          = sgiseeq_get_stats;
 716         dev->set_multicast_list = sgiseeq_set_multicast;
 717         dev->set_mac_address    = sgiseeq_set_mac_address;
 718         dev->irq                = irq;
 719
 720         if (register_netdev(dev)) {
 721                 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
 722                        "aborting.\n");
 723                 err = -ENODEV;
 724                 goto err_out_free_page;
 725         }
 726
 727         printk(KERN_INFO "%s: SGI Seeq8003 ", dev->name);
 728         for (i = 0; i < 6; i++)
 729                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 730
 731         sp->next_module = root_sgiseeq_dev;
 732         root_sgiseeq_dev = dev;
 733
 734         return 0;
 735
 736 err_out_free_page:
 737         free_page((unsigned long) sp);
 738 err_out_free_dev:
 739         kfree(dev);
 740
 741 err_out:
 742         return err;
 743 }
 744
 745 static int __init sgiseeq_probe(void)
 746 {
 747         printk(version);
 748
 749         /* On board adapter on 1st HPC is always present */
 750         return sgiseeq_init(hpc3c0, SGI_ENET_IRQ);
 751 }
 752
 753 static void __exit sgiseeq_exit(void)
 754 {
 755         struct net_device *next, *dev;
 756         struct sgiseeq_private *sp;
 757         int irq;
 758
 759         for (dev = root_sgiseeq_dev; dev; dev = next) {
 760                 sp = (struct sgiseeq_private *) netdev_priv(dev);
 761                 next = sp->next_module;
 762                 irq = dev->irq;
 763                 unregister_netdev(dev);
 764                 free_irq(irq, dev);
 765                 free_page((unsigned long) sp);
 766                 free_netdev(dev);
 767         }
 768 }
 769
 770 module_init(sgiseeq_probe);
 771 module_exit(sgiseeq_exit);
 772
 773 MODULE_LICENSE("GPL");