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 *sgiseeqstr = "SGI Seeq8003";
  36
  37 /*
  38  * If you want speed, you do something silly, it always has worked for me.  So,
  39  * with that in mind, I've decided to make this driver look completely like a
  40  * stupid Lance from a driver architecture perspective.  Only difference is that
  41  * here our "ring buffer" looks and acts like a real Lance one does but is
  42  * layed out like how the HPC DMA and the Seeq want it to.  You'd be surprised
  43  * how a stupid idea like this can pay off in performance, not to mention
  44  * making this driver 2,000 times easier to write. ;-)
  45  */
  46
  47 /* Tune these if we tend to run out often etc. */
  48 #define SEEQ_RX_BUFFERS  16
  49 #define SEEQ_TX_BUFFERS  16
  50
  51 #define PKT_BUF_SZ       1584
  52
  53 #define NEXT_RX(i)  (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
  54 #define NEXT_TX(i)  (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
  55 #define PREV_RX(i)  (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
  56 #define PREV_TX(i)  (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
  57
  58 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
  59                             sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
  60                             sp->tx_old - sp->tx_new - 1)
  61
  62 #define DEBUG
  63
  64 struct sgiseeq_rx_desc {
  65         volatile struct hpc_dma_desc rdma;
  66         volatile signed int buf_vaddr;
  67 };
  68
  69 struct sgiseeq_tx_desc {
  70         volatile struct hpc_dma_desc tdma;
  71         volatile signed int buf_vaddr;
  72 };
  73
  74 /*
  75  * Warning: This structure is layed out in a certain way because HPC dma
  76  *          descriptors must be 8-byte aligned.  So don't touch this without
  77  *          some care.
  78  */
  79 struct sgiseeq_init_block { /* Note the name ;-) */
  80         struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
  81         struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
  82 };
  83
  84 struct sgiseeq_private {
  85         struct sgiseeq_init_block *srings;
  86
  87         /* Ptrs to the descriptors in uncached space. */
  88         struct sgiseeq_rx_desc *rx_desc;
  89         struct sgiseeq_tx_desc *tx_desc;
  90
  91         char *name;
  92         struct hpc3_ethregs *hregs;
  93         struct sgiseeq_regs *sregs;
  94
  95         /* Ring entry counters. */
  96         unsigned int rx_new, tx_new;
  97         unsigned int rx_old, tx_old;
  98
  99         int is_edlc;
 100         unsigned char control;
 101         unsigned char mode;
 102
 103         struct net_device_stats stats;
 104
 105         struct net_device *next_module;
 106         spinlock_t tx_lock;
 107 };
 108
 109 /* A list of all installed seeq devices, for removing the driver module. */
 110 static struct net_device *root_sgiseeq_dev;
 111
 112 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
 113 {
 114         hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
 115         udelay(20);
 116         hregs->reset = 0;
 117 }
 118
 119 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
 120                                        struct sgiseeq_regs *sregs)
 121 {
 122         hregs->rx_ctrl = hregs->tx_ctrl = 0;
 123         hpc3_eth_reset(hregs);
 124 }
 125
 126 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
 127                        SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
 128
 129 static inline void seeq_go(struct sgiseeq_private *sp,
 130                            struct hpc3_ethregs *hregs,
 131                            struct sgiseeq_regs *sregs)
 132 {
 133         sregs->rstat = sp->mode | RSTAT_GO_BITS;
 134         hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
 135 }
 136
 137 static inline void __sgiseeq_set_mac_address(struct net_device *dev)
 138 {
 139         struct sgiseeq_private *sp = netdev_priv(dev);
 140         struct sgiseeq_regs *sregs = sp->sregs;
 141         int i;
 142
 143         sregs->tstat = SEEQ_TCMD_RB0;
 144         for (i = 0; i < 6; i++)
 145                 sregs->rw.eth_addr[i] = dev->dev_addr[i];
 146 }
 147
 148 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
 149 {
 150         struct sgiseeq_private *sp = netdev_priv(dev);
 151         struct sockaddr *sa = addr;
 152
 153         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 154
 155         spin_lock_irq(&sp->tx_lock);
 156         __sgiseeq_set_mac_address(dev);
 157         spin_unlock_irq(&sp->tx_lock);
 158
 159         return 0;
 160 }
 161
 162 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
 163 #define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
 164 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
 165
 166 static int seeq_init_ring(struct net_device *dev)
 167 {
 168         struct sgiseeq_private *sp = netdev_priv(dev);
 169         int i;
 170
 171         netif_stop_queue(dev);
 172         sp->rx_new = sp->tx_new = 0;
 173         sp->rx_old = sp->tx_old = 0;
 174
 175         __sgiseeq_set_mac_address(dev);
 176
 177         /* Setup tx ring. */
 178         for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
 179                 if (!sp->tx_desc[i].tdma.pbuf) {
 180                         unsigned long buffer;
 181
 182                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 183                         if (!buffer)
 184                                 return -ENOMEM;
 185                         sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
 186                         sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer);
 187                 }
 188                 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
 189         }
 190
 191         /* And now the rx ring. */
 192         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 193                 if (!sp->rx_desc[i].rdma.pbuf) {
 194                         unsigned long buffer;
 195
 196                         buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
 197                         if (!buffer)
 198                                 return -ENOMEM;
 199                         sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
 200                         sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer);
 201                 }
 202                 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
 203         }
 204         sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
 205         return 0;
 206 }
 207
 208 #ifdef DEBUG
 209 static struct sgiseeq_private *gpriv;
 210 static struct net_device *gdev;
 211
 212 void sgiseeq_dump_rings(void)
 213 {
 214         static int once;
 215         struct sgiseeq_rx_desc *r = gpriv->rx_desc;
 216         struct sgiseeq_tx_desc *t = gpriv->tx_desc;
 217         struct hpc3_ethregs *hregs = gpriv->hregs;
 218         int i;
 219
 220         if (once)
 221                 return;
 222         once++;
 223         printk("RING DUMP:\n");
 224         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 225                 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
 226                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 227                        r[i].rdma.pnext);
 228                 i += 1;
 229                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 230                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 231                        r[i].rdma.pnext);
 232         }
 233         for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
 234                 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
 235                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 236                        t[i].tdma.pnext);
 237                 i += 1;
 238                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 239                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 240                        t[i].tdma.pnext);
 241         }
 242         printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
 243                gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
 244         printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
 245                hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
 246         printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
 247                hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
 248 }
 249 #endif
 250
 251 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
 252 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
 253
 254 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
 255                      struct sgiseeq_regs *sregs)
 256 {
 257         struct hpc3_ethregs *hregs = sp->hregs;
 258         int err;
 259
 260         reset_hpc3_and_seeq(hregs, sregs);
 261         err = seeq_init_ring(dev);
 262         if (err)
 263                 return err;
 264
 265         /* Setup to field the proper interrupt types. */
 266         if (sp->is_edlc) {
 267                 sregs->tstat = TSTAT_INIT_EDLC;
 268                 sregs->rw.wregs.control = sp->control;
 269                 sregs->rw.wregs.frame_gap = 0;
 270         } else {
 271                 sregs->tstat = TSTAT_INIT_SEEQ;
 272         }
 273
 274         hregs->rx_ndptr = CPHYSADDR(sp->rx_desc);
 275         hregs->tx_ndptr = CPHYSADDR(sp->tx_desc);
 276
 277         seeq_go(sp, hregs, sregs);
 278         return 0;
 279 }
 280
 281 static inline void record_rx_errors(struct sgiseeq_private *sp,
 282                                     unsigned char status)
 283 {
 284         if (status & SEEQ_RSTAT_OVERF ||
 285             status & SEEQ_RSTAT_SFRAME)
 286                 sp->stats.rx_over_errors++;
 287         if (status & SEEQ_RSTAT_CERROR)
 288                 sp->stats.rx_crc_errors++;
 289         if (status & SEEQ_RSTAT_DERROR)
 290                 sp->stats.rx_frame_errors++;
 291         if (status & SEEQ_RSTAT_REOF)
 292                 sp->stats.rx_errors++;
 293 }
 294
 295 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
 296                                     struct hpc3_ethregs *hregs,
 297                                     struct sgiseeq_regs *sregs)
 298 {
 299         if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
 300                 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new);
 301                 seeq_go(sp, hregs, sregs);
 302         }
 303 }
 304
 305 #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \
 306                                 !((rd)->rdma.cntinfo & HPCDMA_OWN); \
 307                                 (rd) = &(sp)->rx_desc[(sp)->rx_new])
 308
 309 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
 310                               struct hpc3_ethregs *hregs,
 311                               struct sgiseeq_regs *sregs)
 312 {
 313         struct sgiseeq_rx_desc *rd;
 314         struct sk_buff *skb = 0;
 315         unsigned char pkt_status;
 316         unsigned char *pkt_pointer = 0;
 317         int len = 0;
 318         unsigned int orig_end = PREV_RX(sp->rx_new);
 319
 320         /* Service every received packet. */
 321         for_each_rx(rd, sp) {
 322                 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
 323                 pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
 324                 pkt_status = pkt_pointer[len + 2];
 325
 326                 if (pkt_status & SEEQ_RSTAT_FIG) {
 327                         /* Packet is OK. */
 328                         skb = dev_alloc_skb(len + 2);
 329
 330                         if (skb) {
 331                                 skb->dev = dev;
 332                                 skb_reserve(skb, 2);
 333                                 skb_put(skb, len);
 334
 335                                 /* Copy out of kseg1 to avoid silly cache flush. */
 336                                 eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
 337                                 skb->protocol = eth_type_trans(skb, dev);
 338
 339                                 /* We don't want to receive our own packets */
 340                                 if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) {
 341                                         netif_rx(skb);
 342                                         dev->last_rx = jiffies;
 343                                         sp->stats.rx_packets++;
 344                                         sp->stats.rx_bytes += len;
 345                                 } else {
 346                                         /* Silently drop my own packets */
 347                                         dev_kfree_skb_irq(skb);
 348                                 }
 349                         } else {
 350                                 printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
 351                                         dev->name);
 352                                 sp->stats.rx_dropped++;
 353                         }
 354                 } else {
 355                         record_rx_errors(sp, pkt_status);
 356                 }
 357
 358                 /* Return the entry to the ring pool. */
 359                 rd->rdma.cntinfo = RCNTINFO_INIT;
 360                 sp->rx_new = NEXT_RX(sp->rx_new);
 361         }
 362         sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
 363         sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
 364         rx_maybe_restart(sp, hregs, sregs);
 365 }
 366
 367 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
 368                                              struct sgiseeq_regs *sregs)
 369 {
 370         if (sp->is_edlc) {
 371                 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
 372                 sregs->rw.wregs.control = sp->control;
 373         }
 374 }
 375
 376 static inline void kick_tx(struct sgiseeq_tx_desc *td,
 377                            struct hpc3_ethregs *hregs)
 378 {
 379         /* If the HPC aint doin nothin, and there are more packets
 380          * with ETXD cleared and XIU set we must make very certain
 381          * that we restart the HPC else we risk locking up the
 382          * adapter.  The following code is only safe iff the HPCDMA
 383          * is not active!
 384          */
 385         while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
 386               (HPCDMA_XIU | HPCDMA_ETXD))
 387                 td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext);
 388         if (td->tdma.cntinfo & HPCDMA_XIU) {
 389                 hregs->tx_ndptr = CPHYSADDR(td);
 390                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 391         }
 392 }
 393
 394 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
 395                               struct hpc3_ethregs *hregs,
 396                               struct sgiseeq_regs *sregs)
 397 {
 398         struct sgiseeq_tx_desc *td;
 399         unsigned long status = hregs->tx_ctrl;
 400         int j;
 401
 402         tx_maybe_reset_collisions(sp, sregs);
 403
 404         if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
 405                 /* Oops, HPC detected some sort of error. */
 406                 if (status & SEEQ_TSTAT_R16)
 407                         sp->stats.tx_aborted_errors++;
 408                 if (status & SEEQ_TSTAT_UFLOW)
 409                         sp->stats.tx_fifo_errors++;
 410                 if (status & SEEQ_TSTAT_LCLS)
 411                         sp->stats.collisions++;
 412         }
 413
 414         /* Ack 'em... */
 415         for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
 416                 td = &sp->tx_desc[j];
 417
 418                 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
 419                         break;
 420                 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
 421                         if (!(status & HPC3_ETXCTRL_ACTIVE)) {
 422                                 hregs->tx_ndptr = CPHYSADDR(td);
 423                                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 424                         }
 425                         break;
 426                 }
 427                 sp->stats.tx_packets++;
 428                 sp->tx_old = NEXT_TX(sp->tx_old);
 429                 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
 430                 td->tdma.cntinfo |= HPCDMA_EOX;
 431         }
 432 }
 433
 434 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 435 {
 436         struct net_device *dev = (struct net_device *) dev_id;
 437         struct sgiseeq_private *sp = netdev_priv(dev);
 438         struct hpc3_ethregs *hregs = sp->hregs;
 439         struct sgiseeq_regs *sregs = sp->sregs;
 440
 441         spin_lock(&sp->tx_lock);
 442
 443         /* Ack the IRQ and set software state. */
 444         hregs->reset = HPC3_ERST_CLRIRQ;
 445
 446         /* Always check for received packets. */
 447         sgiseeq_rx(dev, sp, hregs, sregs);
 448
 449         /* Only check for tx acks if we have something queued. */
 450         if (sp->tx_old != sp->tx_new)
 451                 sgiseeq_tx(dev, sp, hregs, sregs);
 452
 453         if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
 454                 netif_wake_queue(dev);
 455         }
 456         spin_unlock(&sp->tx_lock);
 457
 458         return IRQ_HANDLED;
 459 }
 460
 461 static int sgiseeq_open(struct net_device *dev)
 462 {
 463         struct sgiseeq_private *sp = netdev_priv(dev);
 464         struct sgiseeq_regs *sregs = sp->sregs;
 465         unsigned int irq = dev->irq;
 466         int err;
 467
 468         if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
 469                 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
 470                 err = -EAGAIN;
 471         }
 472
 473         err = init_seeq(dev, sp, sregs);
 474         if (err)
 475                 goto out_free_irq;
 476
 477         netif_start_queue(dev);
 478
 479         return 0;
 480
 481 out_free_irq:
 482         free_irq(irq, dev);
 483
 484         return err;
 485 }
 486
 487 static int sgiseeq_close(struct net_device *dev)
 488 {
 489         struct sgiseeq_private *sp = netdev_priv(dev);
 490         struct sgiseeq_regs *sregs = sp->sregs;
 491         unsigned int irq = dev->irq;
 492
 493         netif_stop_queue(dev);
 494
 495         /* Shutdown the Seeq. */
 496         reset_hpc3_and_seeq(sp->hregs, sregs);
 497         free_irq(irq, dev);
 498
 499         return 0;
 500 }
 501
 502 static inline int sgiseeq_reset(struct net_device *dev)
 503 {
 504         struct sgiseeq_private *sp = netdev_priv(dev);
 505         struct sgiseeq_regs *sregs = sp->sregs;
 506         int err;
 507
 508         err = init_seeq(dev, sp, sregs);
 509         if (err)
 510                 return err;
 511
 512         dev->trans_start = jiffies;
 513         netif_wake_queue(dev);
 514
 515         return 0;
 516 }
 517
 518 void sgiseeq_my_reset(void)
 519 {
 520         printk("RESET!\n");
 521         sgiseeq_reset(gdev);
 522 }
 523
 524 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
 525 {
 526         struct sgiseeq_private *sp = netdev_priv(dev);
 527         struct hpc3_ethregs *hregs = sp->hregs;
 528         unsigned long flags;
 529         struct sgiseeq_tx_desc *td;
 530         int skblen, len, entry;
 531
 532         spin_lock_irqsave(&sp->tx_lock, flags);
 533
 534         /* Setup... */
 535         skblen = skb->len;
 536         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 537         sp->stats.tx_bytes += len;
 538         entry = sp->tx_new;
 539         td = &sp->tx_desc[entry];
 540
 541         /* Create entry.  There are so many races with adding a new
 542          * descriptor to the chain:
 543          * 1) Assume that the HPC is off processing a DMA chain while
 544          *    we are changing all of the following.
 545          * 2) Do no allow the HPC to look at a new descriptor until
 546          *    we have completely set up it's state.  This means, do
 547          *    not clear HPCDMA_EOX in the current last descritptor
 548          *    until the one we are adding looks consistent and could
 549          *    be processes right now.
 550          * 3) The tx interrupt code must notice when we've added a new
 551          *    entry and the HPC got to the end of the chain before we
 552          *    added this new entry and restarted it.
 553          */
 554         memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);
 555         if (len != skblen)
 556                 memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);
 557         td->tdma.cntinfo = (len & HPCDMA_BCNT) |
 558                            HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
 559         if (sp->tx_old != sp->tx_new) {
 560                 struct sgiseeq_tx_desc *backend;
 561
 562                 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
 563                 backend->tdma.cntinfo &= ~HPCDMA_EOX;
 564         }
 565         sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
 566
 567         /* Maybe kick the HPC back into motion. */
 568         if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
 569                 kick_tx(&sp->tx_desc[sp->tx_old], hregs);
 570
 571         dev->trans_start = jiffies;
 572         dev_kfree_skb(skb);
 573
 574         if (!TX_BUFFS_AVAIL(sp))
 575                 netif_stop_queue(dev);
 576         spin_unlock_irqrestore(&sp->tx_lock, flags);
 577
 578         return 0;
 579 }
 580
 581 static void timeout(struct net_device *dev)
 582 {
 583         printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
 584         sgiseeq_reset(dev);
 585
 586         dev->trans_start = jiffies;
 587         netif_wake_queue(dev);
 588 }
 589
 590 static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)
 591 {
 592         struct sgiseeq_private *sp = netdev_priv(dev);
 593
 594         return &sp->stats;
 595 }
 596
 597 static void sgiseeq_set_multicast(struct net_device *dev)
 598 {
 599         struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
 600         unsigned char oldmode = sp->mode;
 601
 602         if(dev->flags & IFF_PROMISC)
 603                 sp->mode = SEEQ_RCMD_RANY;
 604         else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count)
 605                 sp->mode = SEEQ_RCMD_RBMCAST;
 606         else
 607                 sp->mode = SEEQ_RCMD_RBCAST;
 608
 609         /* XXX I know this sucks, but is there a better way to reprogram
 610          * XXX the receiver? At least, this shouldn't happen too often.
 611          */
 612
 613         if (oldmode != sp->mode)
 614                 sgiseeq_reset(dev);
 615 }
 616
 617 static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
 618 {
 619         int i = 0;
 620
 621         while (i < (nbufs - 1)) {
 622                 buf[i].tdma.pnext = CPHYSADDR(buf + i + 1);
 623                 buf[i].tdma.pbuf = 0;
 624                 i++;
 625         }
 626         buf[i].tdma.pnext = CPHYSADDR(buf);
 627 }
 628
 629 static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
 630 {
 631         int i = 0;
 632
 633         while (i < (nbufs - 1)) {
 634                 buf[i].rdma.pnext = CPHYSADDR(buf + i + 1);
 635                 buf[i].rdma.pbuf = 0;
 636                 i++;
 637         }
 638         buf[i].rdma.pbuf = 0;
 639         buf[i].rdma.pnext = CPHYSADDR(buf);
 640 }
 641
 642 #define ALIGNED(x)  ((((unsigned long)(x)) + 0xf) & ~(0xf))
 643
 644 static int sgiseeq_init(struct hpc3_regs* hpcregs, int irq)
 645 {
 646         struct sgiseeq_init_block *sr;
 647         struct sgiseeq_private *sp;
 648         struct net_device *dev;
 649         int err, i;
 650
 651         dev = alloc_etherdev(sizeof (struct sgiseeq_private));
 652         if (!dev) {
 653                 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
 654                 err = -ENOMEM;
 655                 goto err_out;
 656         }
 657         sp = netdev_priv(dev);
 658
 659         /* Make private data page aligned */
 660         sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL);
 661         if (!sr) {
 662                 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
 663                 err = -ENOMEM;
 664                 goto err_out_free_dev;
 665         }
 666         sp->srings = sr;
 667
 668 #define EADDR_NVOFS     250
 669         for (i = 0; i < 3; i++) {
 670                 unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i);
 671
 672                 dev->dev_addr[2 * i]     = tmp >> 8;
 673                 dev->dev_addr[2 * i + 1] = tmp & 0xff;
 674         }
 675
 676 #ifdef DEBUG
 677         gpriv = sp;
 678         gdev = dev;
 679 #endif
 680         sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
 681         sp->hregs = &hpcregs->ethregs;
 682         sp->name = sgiseeqstr;
 683         sp->mode = SEEQ_RCMD_RBCAST;
 684
 685         sp->rx_desc = (struct sgiseeq_rx_desc *)
 686                       CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0]));
 687         dma_cache_wback_inv((unsigned long)&sp->srings->rxvector,
 688                             sizeof(sp->srings->rxvector));
 689         sp->tx_desc = (struct sgiseeq_tx_desc *)
 690                       CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0]));
 691         dma_cache_wback_inv((unsigned long)&sp->srings->txvector,
 692                             sizeof(sp->srings->txvector));
 693
 694         /* A couple calculations now, saves many cycles later. */
 695         setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS);
 696         setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS);
 697
 698         /* Setup PIO and DMA transfer timing */
 699         sp->hregs->pconfig = 0x161;
 700         sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
 701                              HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
 702
 703         /* Reset the chip. */
 704         hpc3_eth_reset(sp->hregs);
 705
 706         sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
 707         if (sp->is_edlc)
 708                 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
 709                               SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
 710                               SEEQ_CTRL_ENCARR;
 711
 712         dev->open               = sgiseeq_open;
 713         dev->stop               = sgiseeq_close;
 714         dev->hard_start_xmit    = sgiseeq_start_xmit;
 715         dev->tx_timeout         = timeout;
 716         dev->watchdog_timeo     = (200 * HZ) / 1000;
 717         dev->get_stats          = sgiseeq_get_stats;
 718         dev->set_multicast_list = sgiseeq_set_multicast;
 719         dev->set_mac_address    = sgiseeq_set_mac_address;
 720         dev->irq                = irq;
 721
 722         if (register_netdev(dev)) {
 723                 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
 724                        "aborting.\n");
 725                 err = -ENODEV;
 726                 goto err_out_free_page;
 727         }
 728
 729         printk(KERN_INFO "%s: %s ", dev->name, sgiseeqstr);
 730         for (i = 0; i < 6; i++)
 731                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
 732
 733         sp->next_module = root_sgiseeq_dev;
 734         root_sgiseeq_dev = dev;
 735
 736         return 0;
 737
 738 err_out_free_page:
 739         free_page((unsigned long) sp->srings);
 740 err_out_free_dev:
 741         kfree(dev);
 742
 743 err_out:
 744         return err;
 745 }
 746
 747 static int __init sgiseeq_probe(void)
 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
 758         for (dev = root_sgiseeq_dev; dev; dev = next) {
 759                 sp = (struct sgiseeq_private *) netdev_priv(dev);
 760                 next = sp->next_module;
 761                 unregister_netdev(dev);
 762                 free_page((unsigned long) sp->srings);
 763                 free_netdev(dev);
 764         }
 765 }
 766
 767 module_init(sgiseeq_probe);
 768 module_exit(sgiseeq_exit);
 769
 770 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
 771 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
 772 MODULE_LICENSE("GPL");