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