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/slab.h>
  16 #include <linux/string.h>
  17 #include <linux/delay.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/skbuff.h>
  21
  22 #include <asm/sgi/hpc3.h>
  23 #include <asm/sgi/ip22.h>
  24
  25 #include "sgiseeq.h"
  26
  27 static char *sgiseeqstr = "SGI Seeq8003";
  28
  29 /*
  30  * If you want speed, you do something silly, it always has worked for me.  So,
  31  * with that in mind, I've decided to make this driver look completely like a
  32  * stupid Lance from a driver architecture perspective.  Only difference is that
  33  * here our "ring buffer" looks and acts like a real Lance one does but is
  34  * layed out like how the HPC DMA and the Seeq want it to.  You'd be surprised
  35  * how a stupid idea like this can pay off in performance, not to mention
  36  * making this driver 2,000 times easier to write. ;-)
  37  */
  38
  39 /* Tune these if we tend to run out often etc. */
  40 #define SEEQ_RX_BUFFERS  16
  41 #define SEEQ_TX_BUFFERS  16
  42
  43 #define PKT_BUF_SZ       1584
  44
  45 #define NEXT_RX(i)  (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
  46 #define NEXT_TX(i)  (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
  47 #define PREV_RX(i)  (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
  48 #define PREV_TX(i)  (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
  49
  50 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
  51                             sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
  52                             sp->tx_old - sp->tx_new - 1)
  53
  54 struct sgiseeq_rx_desc {
  55         volatile struct hpc_dma_desc rdma;
  56         volatile signed int buf_vaddr;
  57 };
  58
  59 struct sgiseeq_tx_desc {
  60         volatile struct hpc_dma_desc tdma;
  61         volatile signed int buf_vaddr;
  62 };
  63
  64 /*
  65  * Warning: This structure is layed out in a certain way because HPC dma
  66  *          descriptors must be 8-byte aligned.  So don't touch this without
  67  *          some care.
  68  */
  69 struct sgiseeq_init_block { /* Note the name ;-) */
  70         struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
  71         struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
  72 };
  73
  74 struct sgiseeq_private {
  75         struct sgiseeq_init_block *srings;
  76
  77         /* Ptrs to the descriptors in uncached space. */
  78         struct sgiseeq_rx_desc *rx_desc;
  79         struct sgiseeq_tx_desc *tx_desc;
  80
  81         char *name;
  82         struct hpc3_ethregs *hregs;
  83         struct sgiseeq_regs *sregs;
  84
  85         /* Ring entry counters. */
  86         unsigned int rx_new, tx_new;
  87         unsigned int rx_old, tx_old;
  88
  89         int is_edlc;
  90         unsigned char control;
  91         unsigned char mode;
  92
  93         struct net_device_stats stats;
  94
  95         struct net_device *next_module;
  96         spinlock_t tx_lock;
  97 };
  98
  99 /* A list of all installed seeq devices, for removing the driver module. */
 100 static struct net_device *root_sgiseeq_dev;
 101
 102 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
 103 {
 104         hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
 105         udelay(20);
 106         hregs->reset = 0;
 107 }
 108
 109 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
 110                                        struct sgiseeq_regs *sregs)
 111 {
 112         hregs->rx_ctrl = hregs->tx_ctrl = 0;
 113         hpc3_eth_reset(hregs);
 114 }
 115
 116 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
 117                        SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
 118
 119 static inline void seeq_go(struct sgiseeq_private *sp,
 120                            struct hpc3_ethregs *hregs,
 121                            struct sgiseeq_regs *sregs)
 122 {
 123         sregs->rstat = sp->mode | RSTAT_GO_BITS;
 124         hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
 125 }
 126
 127 static inline void __sgiseeq_set_mac_address(struct net_device *dev)
 128 {
 129         struct sgiseeq_private *sp = netdev_priv(dev);
 130         struct sgiseeq_regs *sregs = sp->sregs;
 131         int i;
 132
 133         sregs->tstat = SEEQ_TCMD_RB0;
 134         for (i = 0; i < 6; i++)
 135                 sregs->rw.eth_addr[i] = dev->dev_addr[i];
 136 }
 137
 138 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
 139 {
 140         struct sgiseeq_private *sp = netdev_priv(dev);
 141         struct sockaddr *sa = addr;
 142
 143         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 144
 145         spin_lock_irq(&sp->tx_lock);
 146         __sgiseeq_set_mac_address(dev);
 147         spin_unlock_irq(&sp->tx_lock);
 148
 149         return 0;
 150 }
 151
 152 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
 153 #define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
 154 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
 155
 156 static int seeq_init_ring(struct net_device *dev)
 157 {
 158         struct sgiseeq_private *sp = netdev_priv(dev);
 159         int i;
 160
 161         netif_stop_queue(dev);
 162         sp->rx_new = sp->tx_new = 0;
 163         sp->rx_old = sp->tx_old = 0;
 164
 165         __sgiseeq_set_mac_address(dev);
 166
 167         /* Setup tx ring. */
 168         for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
 169                 if (!sp->tx_desc[i].tdma.pbuf) {
 170                         unsigned long buffer;
 171
 172                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 173                         if (!buffer)
 174                                 return -ENOMEM;
 175                         sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
 176                         sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer);
 177                 }
 178                 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
 179         }
 180
 181         /* And now the rx ring. */
 182         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 183                 if (!sp->rx_desc[i].rdma.pbuf) {
 184                         unsigned long buffer;
 185
 186                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 187                         if (!buffer)
 188                                 return -ENOMEM;
 189                         sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
 190                         sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer);
 191                 }
 192                 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
 193         }
 194         sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
 195         return 0;
 196 }
 197
 198 #ifdef DEBUG
 199 static struct sgiseeq_private *gpriv;
 200 static struct net_device *gdev;
 201
 202 static void sgiseeq_dump_rings(void)
 203 {
 204         static int once;
 205         struct sgiseeq_rx_desc *r = gpriv->rx_desc;
 206         struct sgiseeq_tx_desc *t = gpriv->tx_desc;
 207         struct hpc3_ethregs *hregs = gpriv->hregs;
 208         int i;
 209
 210         if (once)
 211                 return;
 212         once++;
 213         printk("RING DUMP:\n");
 214         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 215                 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
 216                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 217                        r[i].rdma.pnext);
 218                 i += 1;
 219                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 220                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 221                        r[i].rdma.pnext);
 222         }
 223         for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
 224                 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
 225                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 226                        t[i].tdma.pnext);
 227                 i += 1;
 228                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 229                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 230                        t[i].tdma.pnext);
 231         }
 232         printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
 233                gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
 234         printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
 235                hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
 236         printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
 237                hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
 238 }
 239 #endif
 240
 241 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
 242 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
 243
 244 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
 245                      struct sgiseeq_regs *sregs)
 246 {
 247         struct hpc3_ethregs *hregs = sp->hregs;
 248         int err;
 249
 250         reset_hpc3_and_seeq(hregs, sregs);
 251         err = seeq_init_ring(dev);
 252         if (err)
 253                 return err;
 254
 255         /* Setup to field the proper interrupt types. */
 256         if (sp->is_edlc) {
 257                 sregs->tstat = TSTAT_INIT_EDLC;
 258                 sregs->rw.wregs.control = sp->control;
 259                 sregs->rw.wregs.frame_gap = 0;
 260         } else {
 261                 sregs->tstat = TSTAT_INIT_SEEQ;
 262         }
 263
 264         hregs->rx_ndptr = CPHYSADDR(sp->rx_desc);
 265         hregs->tx_ndptr = CPHYSADDR(sp->tx_desc);
 266
 267         seeq_go(sp, hregs, sregs);
 268         return 0;
 269 }
 270
 271 static inline void record_rx_errors(struct sgiseeq_private *sp,
 272                                     unsigned char status)
 273 {
 274         if (status & SEEQ_RSTAT_OVERF ||
 275             status & SEEQ_RSTAT_SFRAME)
 276                 sp->stats.rx_over_errors++;
 277         if (status & SEEQ_RSTAT_CERROR)
 278                 sp->stats.rx_crc_errors++;
 279         if (status & SEEQ_RSTAT_DERROR)
 280                 sp->stats.rx_frame_errors++;
 281         if (status & SEEQ_RSTAT_REOF)
 282                 sp->stats.rx_errors++;
 283 }
 284
 285 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
 286                                     struct hpc3_ethregs *hregs,
 287                                     struct sgiseeq_regs *sregs)
 288 {
 289         if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
 290                 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new);
 291                 seeq_go(sp, hregs, sregs);
 292         }
 293 }
 294
 295 #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \
 296                                 !((rd)->rdma.cntinfo & HPCDMA_OWN); \
 297                                 (rd) = &(sp)->rx_desc[(sp)->rx_new])
 298
 299 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
 300                               struct hpc3_ethregs *hregs,
 301                               struct sgiseeq_regs *sregs)
 302 {
 303         struct sgiseeq_rx_desc *rd;
 304         struct sk_buff *skb = NULL;
 305         unsigned char pkt_status;
 306         unsigned char *pkt_pointer = NULL;
 307         int len = 0;
 308         unsigned int orig_end = PREV_RX(sp->rx_new);
 309
 310         /* Service every received packet. */
 311         for_each_rx(rd, sp) {
 312                 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
 313                 pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
 314                 pkt_status = pkt_pointer[len + 2];
 315
 316                 if (pkt_status & SEEQ_RSTAT_FIG) {
 317                         /* Packet is OK. */
 318                         skb = dev_alloc_skb(len + 2);
 319
 320                         if (skb) {
 321                                 skb->dev = dev;
 322                                 skb_reserve(skb, 2);
 323                                 skb_put(skb, len);
 324
 325                                 /* Copy out of kseg1 to avoid silly cache flush. */
 326                                 eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
 327                                 skb->protocol = eth_type_trans(skb, dev);
 328
 329                                 /* We don't want to receive our own packets */
 330                                 if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) {
 331                                         netif_rx(skb);
 332                                         dev->last_rx = jiffies;
 333                                         sp->stats.rx_packets++;
 334                                         sp->stats.rx_bytes += len;
 335                                 } else {
 336                                         /* Silently drop my own packets */
 337                                         dev_kfree_skb_irq(skb);
 338                                 }
 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->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
 353         sp->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) CKSEG1ADDR(td->tdma.pnext);
 378         if (td->tdma.cntinfo & HPCDMA_XIU) {
 379                 hregs->tx_ndptr = CPHYSADDR(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->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 = CPHYSADDR(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)
 425 {
 426         struct net_device *dev = (struct net_device *) dev_id;
 427         struct sgiseeq_private *sp = netdev_priv(dev);
 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->reset = HPC3_ERST_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 = netdev_priv(dev);
 454         struct sgiseeq_regs *sregs = sp->sregs;
 455         unsigned int irq = dev->irq;
 456         int err;
 457
 458         if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
 459                 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
 460                 err = -EAGAIN;
 461         }
 462
 463         err = init_seeq(dev, sp, sregs);
 464         if (err)
 465                 goto out_free_irq;
 466
 467         netif_start_queue(dev);
 468
 469         return 0;
 470
 471 out_free_irq:
 472         free_irq(irq, dev);
 473
 474         return err;
 475 }
 476
 477 static int sgiseeq_close(struct net_device *dev)
 478 {
 479         struct sgiseeq_private *sp = netdev_priv(dev);
 480         struct sgiseeq_regs *sregs = sp->sregs;
 481         unsigned int irq = dev->irq;
 482
 483         netif_stop_queue(dev);
 484
 485         /* Shutdown the Seeq. */
 486         reset_hpc3_and_seeq(sp->hregs, sregs);
 487         free_irq(irq, dev);
 488
 489         return 0;
 490 }
 491
 492 static inline int sgiseeq_reset(struct net_device *dev)
 493 {
 494         struct sgiseeq_private *sp = netdev_priv(dev);
 495         struct sgiseeq_regs *sregs = sp->sregs;
 496         int err;
 497
 498         err = init_seeq(dev, sp, sregs);
 499         if (err)
 500                 return err;
 501
 502         dev->trans_start = jiffies;
 503         netif_wake_queue(dev);
 504
 505         return 0;
 506 }
 507
 508 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
 509 {
 510         struct sgiseeq_private *sp = netdev_priv(dev);
 511         struct hpc3_ethregs *hregs = sp->hregs;
 512         unsigned long flags;
 513         struct sgiseeq_tx_desc *td;
 514         int skblen, len, entry;
 515
 516         spin_lock_irqsave(&sp->tx_lock, flags);
 517
 518         /* Setup... */
 519         skblen = skb->len;
 520         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 521         sp->stats.tx_bytes += len;
 522         entry = sp->tx_new;
 523         td = &sp->tx_desc[entry];
 524
 525         /* Create entry.  There are so many races with adding a new
 526          * descriptor to the chain:
 527          * 1) Assume that the HPC is off processing a DMA chain while
 528          *    we are changing all of the following.
 529          * 2) Do no allow the HPC to look at a new descriptor until
 530          *    we have completely set up it's state.  This means, do
 531          *    not clear HPCDMA_EOX in the current last descritptor
 532          *    until the one we are adding looks consistent and could
 533          *    be processes right now.
 534          * 3) The tx interrupt code must notice when we've added a new
 535          *    entry and the HPC got to the end of the chain before we
 536          *    added this new entry and restarted it.
 537          */
 538         memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);
 539         if (len != skblen)
 540                 memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);
 541         td->tdma.cntinfo = (len & HPCDMA_BCNT) |
 542                            HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
 543         if (sp->tx_old != sp->tx_new) {
 544                 struct sgiseeq_tx_desc *backend;
 545
 546                 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
 547                 backend->tdma.cntinfo &= ~HPCDMA_EOX;
 548         }
 549         sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
 550
 551         /* Maybe kick the HPC back into motion. */
 552         if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
 553                 kick_tx(&sp->tx_desc[sp->tx_old], hregs);
 554
 555         dev->trans_start = jiffies;
 556         dev_kfree_skb(skb);
 557
 558         if (!TX_BUFFS_AVAIL(sp))
 559                 netif_stop_queue(dev);
 560         spin_unlock_irqrestore(&sp->tx_lock, flags);
 561
 562         return 0;
 563 }
 564
 565 static void timeout(struct net_device *dev)
 566 {
 567         printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
 568         sgiseeq_reset(dev);
 569
 570         dev->trans_start = jiffies;
 571         netif_wake_queue(dev);
 572 }
 573
 574 static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)
 575 {
 576         struct sgiseeq_private *sp = netdev_priv(dev);
 577
 578         return &sp->stats;
 579 }
 580
 581 static void sgiseeq_set_multicast(struct net_device *dev)
 582 {
 583         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 584         unsigned char oldmode = sp->mode;
 585
 586         if(dev->flags & IFF_PROMISC)
 587                 sp->mode = SEEQ_RCMD_RANY;
 588         else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count)
 589                 sp->mode = SEEQ_RCMD_RBMCAST;
 590         else
 591                 sp->mode = SEEQ_RCMD_RBCAST;
 592
 593         /* XXX I know this sucks, but is there a better way to reprogram
 594          * XXX the receiver? At least, this shouldn't happen too often.
 595          */
 596
 597         if (oldmode != sp->mode)
 598                 sgiseeq_reset(dev);
 599 }
 600
 601 static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
 602 {
 603         int i = 0;
 604
 605         while (i < (nbufs - 1)) {
 606                 buf[i].tdma.pnext = CPHYSADDR(buf + i + 1);
 607                 buf[i].tdma.pbuf = 0;
 608                 i++;
 609         }
 610         buf[i].tdma.pnext = CPHYSADDR(buf);
 611 }
 612
 613 static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
 614 {
 615         int i = 0;
 616
 617         while (i < (nbufs - 1)) {
 618                 buf[i].rdma.pnext = CPHYSADDR(buf + i + 1);
 619                 buf[i].rdma.pbuf = 0;
 620                 i++;
 621         }
 622         buf[i].rdma.pbuf = 0;
 623         buf[i].rdma.pnext = CPHYSADDR(buf);
 624 }
 625
 626 #define ALIGNED(x)  ((((unsigned long)(x)) + 0xf) & ~(0xf))
 627
 628 static int sgiseeq_init(struct hpc3_regs* hpcregs, int irq)
 629 {
 630         struct sgiseeq_init_block *sr;
 631         struct sgiseeq_private *sp;
 632         struct net_device *dev;
 633         int err, i;
 634
 635         dev = alloc_etherdev(sizeof (struct sgiseeq_private));
 636         if (!dev) {
 637                 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
 638                 err = -ENOMEM;
 639                 goto err_out;
 640         }
 641         sp = netdev_priv(dev);
 642
 643         /* Make private data page aligned */
 644         sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL);
 645         if (!sr) {
 646                 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
 647                 err = -ENOMEM;
 648                 goto err_out_free_dev;
 649         }
 650         sp->srings = sr;
 651
 652 #define EADDR_NVOFS     250
 653         for (i = 0; i < 3; i++) {
 654                 unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i);
 655
 656                 dev->dev_addr[2 * i]     = tmp >> 8;
 657                 dev->dev_addr[2 * i + 1] = tmp & 0xff;
 658         }
 659
 660 #ifdef DEBUG
 661         gpriv = sp;
 662         gdev = dev;
 663 #endif
 664         sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
 665         sp->hregs = &hpcregs->ethregs;
 666         sp->name = sgiseeqstr;
 667         sp->mode = SEEQ_RCMD_RBCAST;
 668
 669         sp->rx_desc = (struct sgiseeq_rx_desc *)
 670                       CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0]));
 671         dma_cache_wback_inv((unsigned long)&sp->srings->rxvector,
 672                             sizeof(sp->srings->rxvector));
 673         sp->tx_desc = (struct sgiseeq_tx_desc *)
 674                       CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0]));
 675         dma_cache_wback_inv((unsigned long)&sp->srings->txvector,
 676                             sizeof(sp->srings->txvector));
 677
 678         /* A couple calculations now, saves many cycles later. */
 679         setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS);
 680         setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS);
 681
 682         /* Setup PIO and DMA transfer timing */
 683         sp->hregs->pconfig = 0x161;
 684         sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
 685                              HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
 686
 687         /* Reset the chip. */
 688         hpc3_eth_reset(sp->hregs);
 689
 690         sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
 691         if (sp->is_edlc)
 692                 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
 693                               SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
 694                               SEEQ_CTRL_ENCARR;
 695
 696         dev->open               = sgiseeq_open;
 697         dev->stop               = sgiseeq_close;
 698         dev->hard_start_xmit    = sgiseeq_start_xmit;
 699         dev->tx_timeout         = timeout;
 700         dev->watchdog_timeo     = (200 * HZ) / 1000;
 701         dev->get_stats          = sgiseeq_get_stats;
 702         dev->set_multicast_list = sgiseeq_set_multicast;
 703         dev->set_mac_address    = sgiseeq_set_mac_address;
 704         dev->irq                = irq;
 705
 706         if (register_netdev(dev)) {
 707                 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
 708                        "aborting.\n");
 709                 err = -ENODEV;
 710                 goto err_out_free_page;
 711         }
 712
 713         printk(KERN_INFO "%s: %s ", dev->name, sgiseeqstr);
 714         for (i = 0; i < 6; i++)
 715                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 716
 717         sp->next_module = root_sgiseeq_dev;
 718         root_sgiseeq_dev = dev;
 719
 720         return 0;
 721
 722 err_out_free_page:
 723         free_page((unsigned long) sp->srings);
 724 err_out_free_dev:
 725         kfree(dev);
 726
 727 err_out:
 728         return err;
 729 }
 730
 731 static int __init sgiseeq_probe(void)
 732 {
 733         /* On board adapter on 1st HPC is always present */
 734         return sgiseeq_init(hpc3c0, SGI_ENET_IRQ);
 735 }
 736
 737 static void __exit sgiseeq_exit(void)
 738 {
 739         struct net_device *next, *dev;
 740         struct sgiseeq_private *sp;
 741
 742         for (dev = root_sgiseeq_dev; dev; dev = next) {
 743                 sp = (struct sgiseeq_private *) netdev_priv(dev);
 744                 next = sp->next_module;
 745                 unregister_netdev(dev);
 746                 free_page((unsigned long) sp->srings);
 747                 free_netdev(dev);
 748         }
 749 }
 750
 751 module_init(sgiseeq_probe);
 752 module_exit(sgiseeq_exit);
 753
 754 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
 755 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
 756 MODULE_LICENSE("GPL");