drivers/net/ariadne.c

   1 /*
   2  *  Amiga Linux/m68k Ariadne Ethernet Driver
   3  *
   4  *  © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org)
   5  *                           Peter De Schrijver (p2@mind.be)
   6  *
   7  *  ---------------------------------------------------------------------------
   8  *
   9  *  This program is based on
  10  *
  11  *      lance.c:        An AMD LANCE ethernet driver for linux.
  12  *                      Written 1993-94 by Donald Becker.
  13  *
  14  *      Am79C960:       PCnet(tm)-ISA Single-Chip Ethernet Controller
  15  *                      Advanced Micro Devices
  16  *                      Publication #16907, Rev. B, Amendment/0, May 1994
  17  *
  18  *      MC68230:        Parallel Interface/Timer (PI/T)
  19  *                      Motorola Semiconductors, December, 1983
  20  *
  21  *  ---------------------------------------------------------------------------
  22  *
  23  *  This file is subject to the terms and conditions of the GNU General Public
  24  *  License.  See the file COPYING in the main directory of the Linux
  25  *  distribution for more details.
  26  *
  27  *  ---------------------------------------------------------------------------
  28  *
  29  *  The Ariadne is a Zorro-II board made by Village Tronic. It contains:
  30  *
  31  *      - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
  32  *        10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
  33  *
  34  *      - an MC68230 Parallel Interface/Timer configured as 2 parallel ports
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/stddef.h>
  39 #include <linux/kernel.h>
  40 #include <linux/string.h>
  41 #include <linux/errno.h>
  42 #include <linux/ioport.h>
  43 #include <linux/slab.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/etherdevice.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/skbuff.h>
  48 #include <linux/init.h>
  49 #include <linux/zorro.h>
  50 #include <linux/bitops.h>
  51
  52 #include <asm/amigaints.h>
  53 #include <asm/amigahw.h>
  54 #include <asm/irq.h>
  55
  56 #include "ariadne.h"
  57
  58
  59 #ifdef ARIADNE_DEBUG
  60 int ariadne_debug = ARIADNE_DEBUG;
  61 #else
  62 int ariadne_debug = 1;
  63 #endif
  64
  65
  66     /*
  67      *  Macros to Fix Endianness problems
  68      */
  69
  70                                 /* Swap the Bytes in a WORD */
  71 #define swapw(x)        (((x>>8)&0x00ff)|((x<<8)&0xff00))
  72                                 /* Get the Low BYTE in a WORD */
  73 #define lowb(x)         (x&0xff)
  74                                 /* Get the Swapped High WORD in a LONG */
  75 #define swhighw(x)      ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
  76                                 /* Get the Swapped Low WORD in a LONG */
  77 #define swloww(x)       ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
  78
  79
  80     /*
  81      *  Transmit/Receive Ring Definitions
  82      */
  83
  84 #define TX_RING_SIZE    5
  85 #define RX_RING_SIZE    16
  86
  87 #define PKT_BUF_SIZE    1520
  88
  89
  90     /*
  91      *  Private Device Data
  92      */
  93
  94 struct ariadne_private {
  95     volatile struct TDRE *tx_ring[TX_RING_SIZE];
  96     volatile struct RDRE *rx_ring[RX_RING_SIZE];
  97     volatile u_short *tx_buff[TX_RING_SIZE];
  98     volatile u_short *rx_buff[RX_RING_SIZE];
  99     int cur_tx, cur_rx;                 /* The next free ring entry */
 100     int dirty_tx;                       /* The ring entries to be free()ed. */
 101     struct net_device_stats stats;
 102     char tx_full;
 103 };
 104
 105
 106     /*
 107      *  Structure Created in the Ariadne's RAM Buffer
 108      */
 109
 110 struct lancedata {
 111     struct TDRE tx_ring[TX_RING_SIZE];
 112     struct RDRE rx_ring[RX_RING_SIZE];
 113     u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
 114     u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
 115 };
 116
 117 static int ariadne_open(struct net_device *dev);
 118 static void ariadne_init_ring(struct net_device *dev);
 119 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev);
 120 static void ariadne_tx_timeout(struct net_device *dev);
 121 static int ariadne_rx(struct net_device *dev);
 122 static void ariadne_reset(struct net_device *dev);
 123 static irqreturn_t ariadne_interrupt(int irq, void *data);
 124 static int ariadne_close(struct net_device *dev);
 125 static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
 126 #ifdef HAVE_MULTICAST
 127 static void set_multicast_list(struct net_device *dev);
 128 #endif
 129
 130
 131 static void memcpyw(volatile u_short *dest, u_short *src, int len)
 132 {
 133     while (len >= 2) {
 134         *(dest++) = *(src++);
 135         len -= 2;
 136     }
 137     if (len == 1)
 138         *dest = (*(u_char *)src)<<8;
 139 }
 140
 141
 142 static int __devinit ariadne_init_one(struct zorro_dev *z,
 143                                       const struct zorro_device_id *ent);
 144 static void __devexit ariadne_remove_one(struct zorro_dev *z);
 145
 146
 147 static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
 148     { ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
 149     { 0 }
 150 };
 151
 152 static struct zorro_driver ariadne_driver = {
 153     .name       = "ariadne",
 154     .id_table   = ariadne_zorro_tbl,
 155     .probe      = ariadne_init_one,
 156     .remove     = __devexit_p(ariadne_remove_one),
 157 };
 158
 159 static int __devinit ariadne_init_one(struct zorro_dev *z,
 160                                       const struct zorro_device_id *ent)
 161 {
 162     unsigned long board = z->resource.start;
 163     unsigned long base_addr = board+ARIADNE_LANCE;
 164     unsigned long mem_start = board+ARIADNE_RAM;
 165     struct resource *r1, *r2;
 166     struct net_device *dev;
 167     struct ariadne_private *priv;
 168     int err;
 169     DECLARE_MAC_BUF(mac);
 170
 171     r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
 172     if (!r1)
 173         return -EBUSY;
 174     r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
 175     if (!r2) {
 176         release_resource(r1);
 177         return -EBUSY;
 178     }
 179
 180     dev = alloc_etherdev(sizeof(struct ariadne_private));
 181     if (dev == NULL) {
 182         release_resource(r1);
 183         release_resource(r2);
 184         return -ENOMEM;
 185     }
 186
 187     priv = netdev_priv(dev);
 188
 189     r1->name = dev->name;
 190     r2->name = dev->name;
 191
 192     dev->dev_addr[0] = 0x00;
 193     dev->dev_addr[1] = 0x60;
 194     dev->dev_addr[2] = 0x30;
 195     dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
 196     dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
 197     dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
 198     dev->base_addr = ZTWO_VADDR(base_addr);
 199     dev->mem_start = ZTWO_VADDR(mem_start);
 200     dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
 201
 202     dev->open = &ariadne_open;
 203     dev->stop = &ariadne_close;
 204     dev->hard_start_xmit = &ariadne_start_xmit;
 205     dev->tx_timeout = &ariadne_tx_timeout;
 206     dev->watchdog_timeo = 5*HZ;
 207     dev->get_stats = &ariadne_get_stats;
 208     dev->set_multicast_list = &set_multicast_list;
 209
 210     err = register_netdev(dev);
 211     if (err) {
 212         release_resource(r1);
 213         release_resource(r2);
 214         free_netdev(dev);
 215         return err;
 216     }
 217     zorro_set_drvdata(z, dev);
 218
 219     printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address "
 220            "%s\n", dev->name, board,
 221            print_mac(mac, dev->dev_addr));
 222
 223     return 0;
 224 }
 225
 226
 227 static int ariadne_open(struct net_device *dev)
 228 {
 229     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 230     u_short in;
 231     u_long version;
 232     int i;
 233
 234     /* Reset the LANCE */
 235     in = lance->Reset;
 236
 237     /* Stop the LANCE */
 238     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 239     lance->RDP = STOP;
 240
 241     /* Check the LANCE version */
 242     lance->RAP = CSR88;         /* Chip ID */
 243     version = swapw(lance->RDP);
 244     lance->RAP = CSR89;         /* Chip ID */
 245     version |= swapw(lance->RDP)<<16;
 246     if ((version & 0x00000fff) != 0x00000003) {
 247         printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
 248         return -EAGAIN;
 249     }
 250     if ((version & 0x0ffff000) != 0x00003000) {
 251         printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
 252                "number = %ld)\n", (version & 0x0ffff000)>>12);
 253         return -EAGAIN;
 254     }
 255 #if 0
 256     printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
 257            (version & 0xf0000000)>>28);
 258 #endif
 259
 260     ariadne_init_ring(dev);
 261
 262     /* Miscellaneous Stuff */
 263     lance->RAP = CSR3;          /* Interrupt Masks and Deferral Control */
 264     lance->RDP = 0x0000;
 265     lance->RAP = CSR4;          /* Test and Features Control */
 266     lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
 267
 268     /* Set the Multicast Table */
 269     lance->RAP = CSR8;          /* Logical Address Filter, LADRF[15:0] */
 270     lance->RDP = 0x0000;
 271     lance->RAP = CSR9;          /* Logical Address Filter, LADRF[31:16] */
 272     lance->RDP = 0x0000;
 273     lance->RAP = CSR10;         /* Logical Address Filter, LADRF[47:32] */
 274     lance->RDP = 0x0000;
 275     lance->RAP = CSR11;         /* Logical Address Filter, LADRF[63:48] */
 276     lance->RDP = 0x0000;
 277
 278     /* Set the Ethernet Hardware Address */
 279     lance->RAP = CSR12;         /* Physical Address Register, PADR[15:0] */
 280     lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
 281     lance->RAP = CSR13;         /* Physical Address Register, PADR[31:16] */
 282     lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
 283     lance->RAP = CSR14;         /* Physical Address Register, PADR[47:32] */
 284     lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
 285
 286     /* Set the Init Block Mode */
 287     lance->RAP = CSR15;         /* Mode Register */
 288     lance->RDP = 0x0000;
 289
 290     /* Set the Transmit Descriptor Ring Pointer */
 291     lance->RAP = CSR30;         /* Base Address of Transmit Ring */
 292     lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 293     lance->RAP = CSR31;         /* Base Address of transmit Ring */
 294     lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 295
 296     /* Set the Receive Descriptor Ring Pointer */
 297     lance->RAP = CSR24;         /* Base Address of Receive Ring */
 298     lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 299     lance->RAP = CSR25;         /* Base Address of Receive Ring */
 300     lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 301
 302     /* Set the Number of RX and TX Ring Entries */
 303     lance->RAP = CSR76;         /* Receive Ring Length */
 304     lance->RDP = swapw(((u_short)-RX_RING_SIZE));
 305     lance->RAP = CSR78;         /* Transmit Ring Length */
 306     lance->RDP = swapw(((u_short)-TX_RING_SIZE));
 307
 308     /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
 309     lance->RAP = ISACSR2;       /* Miscellaneous Configuration */
 310     lance->IDP = ASEL;
 311
 312     /* LED Control */
 313     lance->RAP = ISACSR5;       /* LED1 Status */
 314     lance->IDP = PSE|XMTE;
 315     lance->RAP = ISACSR6;       /* LED2 Status */
 316     lance->IDP = PSE|COLE;
 317     lance->RAP = ISACSR7;       /* LED3 Status */
 318     lance->IDP = PSE|RCVE;
 319
 320     netif_start_queue(dev);
 321
 322     i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
 323                     dev->name, dev);
 324     if (i) return i;
 325
 326     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 327     lance->RDP = INEA|STRT;
 328
 329     return 0;
 330 }
 331
 332
 333 static void ariadne_init_ring(struct net_device *dev)
 334 {
 335     struct ariadne_private *priv = netdev_priv(dev);
 336     volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
 337     int i;
 338
 339     netif_stop_queue(dev);
 340
 341     priv->tx_full = 0;
 342     priv->cur_rx = priv->cur_tx = 0;
 343     priv->dirty_tx = 0;
 344
 345     /* Set up TX Ring */
 346     for (i = 0; i < TX_RING_SIZE; i++) {
 347         volatile struct TDRE *t = &lancedata->tx_ring[i];
 348         t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
 349         t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
 350                   TF_STP | TF_ENP;
 351         t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
 352         t->TMD3 = 0;
 353         priv->tx_ring[i] = &lancedata->tx_ring[i];
 354         priv->tx_buff[i] = lancedata->tx_buff[i];
 355 #if 0
 356         printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
 357                &lancedata->tx_ring[i], lancedata->tx_buff[i]);
 358 #endif
 359     }
 360
 361     /* Set up RX Ring */
 362     for (i = 0; i < RX_RING_SIZE; i++) {
 363         volatile struct RDRE *r = &lancedata->rx_ring[i];
 364         r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
 365         r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
 366                   RF_OWN;
 367         r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
 368         r->RMD3 = 0x0000;
 369         priv->rx_ring[i] = &lancedata->rx_ring[i];
 370         priv->rx_buff[i] = lancedata->rx_buff[i];
 371 #if 0
 372         printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
 373                &lancedata->rx_ring[i], lancedata->rx_buff[i]);
 374 #endif
 375     }
 376 }
 377
 378
 379 static int ariadne_close(struct net_device *dev)
 380 {
 381     struct ariadne_private *priv = netdev_priv(dev);
 382     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 383
 384     netif_stop_queue(dev);
 385
 386     lance->RAP = CSR112;        /* Missed Frame Count */
 387     priv->stats.rx_missed_errors = swapw(lance->RDP);
 388     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 389
 390     if (ariadne_debug > 1) {
 391         printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
 392                dev->name, lance->RDP);
 393         printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
 394                priv->stats.rx_missed_errors);
 395     }
 396
 397     /* We stop the LANCE here -- it occasionally polls memory if we don't. */
 398     lance->RDP = STOP;
 399
 400     free_irq(IRQ_AMIGA_PORTS, dev);
 401
 402     return 0;
 403 }
 404
 405
 406 static inline void ariadne_reset(struct net_device *dev)
 407 {
 408     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 409
 410     lance->RAP = CSR0;  /* PCnet-ISA Controller Status */
 411     lance->RDP = STOP;
 412     ariadne_init_ring(dev);
 413     lance->RDP = INEA|STRT;
 414     netif_start_queue(dev);
 415 }
 416
 417
 418 static irqreturn_t ariadne_interrupt(int irq, void *data)
 419 {
 420     struct net_device *dev = (struct net_device *)data;
 421     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 422     struct ariadne_private *priv;
 423     int csr0, boguscnt;
 424     int handled = 0;
 425
 426     if (dev == NULL) {
 427         printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n");
 428         return IRQ_NONE;
 429     }
 430
 431     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 432
 433     if (!(lance->RDP & INTR))           /* Check if any interrupt has been */
 434         return IRQ_NONE;                /* generated by the board. */
 435
 436     priv = netdev_priv(dev);
 437
 438     boguscnt = 10;
 439     while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
 440         /* Acknowledge all of the current interrupt sources ASAP. */
 441         lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
 442
 443 #if 0
 444         if (ariadne_debug > 5) {
 445             printk(KERN_DEBUG "%s: interrupt  csr0=%#2.2x new csr=%#2.2x.",
 446                    dev->name, csr0, lance->RDP);
 447             printk("[");
 448             if (csr0 & INTR)
 449                 printk(" INTR");
 450             if (csr0 & INEA)
 451                 printk(" INEA");
 452             if (csr0 & RXON)
 453                 printk(" RXON");
 454             if (csr0 & TXON)
 455                 printk(" TXON");
 456             if (csr0 & TDMD)
 457                 printk(" TDMD");
 458             if (csr0 & STOP)
 459                 printk(" STOP");
 460             if (csr0 & STRT)
 461                 printk(" STRT");
 462             if (csr0 & INIT)
 463                 printk(" INIT");
 464             if (csr0 & ERR)
 465                 printk(" ERR");
 466             if (csr0 & BABL)
 467                 printk(" BABL");
 468             if (csr0 & CERR)
 469                 printk(" CERR");
 470             if (csr0 & MISS)
 471                 printk(" MISS");
 472             if (csr0 & MERR)
 473                 printk(" MERR");
 474             if (csr0 & RINT)
 475                 printk(" RINT");
 476             if (csr0 & TINT)
 477                 printk(" TINT");
 478             if (csr0 & IDON)
 479                 printk(" IDON");
 480             printk(" ]\n");
 481         }
 482 #endif
 483
 484         if (csr0 & RINT) {      /* Rx interrupt */
 485             handled = 1;
 486             ariadne_rx(dev);
 487         }
 488
 489         if (csr0 & TINT) {      /* Tx-done interrupt */
 490             int dirty_tx = priv->dirty_tx;
 491
 492             handled = 1;
 493             while (dirty_tx < priv->cur_tx) {
 494                 int entry = dirty_tx % TX_RING_SIZE;
 495                 int status = lowb(priv->tx_ring[entry]->TMD1);
 496
 497                 if (status & TF_OWN)
 498                     break;      /* It still hasn't been Txed */
 499
 500                 priv->tx_ring[entry]->TMD1 &= 0xff00;
 501
 502                 if (status & TF_ERR) {
 503                     /* There was an major error, log it. */
 504                     int err_status = priv->tx_ring[entry]->TMD3;
 505                     priv->stats.tx_errors++;
 506                     if (err_status & EF_RTRY)
 507                         priv->stats.tx_aborted_errors++;
 508                     if (err_status & EF_LCAR)
 509                         priv->stats.tx_carrier_errors++;
 510                     if (err_status & EF_LCOL)
 511                         priv->stats.tx_window_errors++;
 512                     if (err_status & EF_UFLO) {
 513                         /* Ackk!  On FIFO errors the Tx unit is turned off! */
 514                         priv->stats.tx_fifo_errors++;
 515                         /* Remove this verbosity later! */
 516                         printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
 517                                dev->name, csr0);
 518                         /* Restart the chip. */
 519                         lance->RDP = STRT;
 520                     }
 521                 } else {
 522                     if (status & (TF_MORE|TF_ONE))
 523                         priv->stats.collisions++;
 524                     priv->stats.tx_packets++;
 525                 }
 526                 dirty_tx++;
 527             }
 528
 529 #ifndef final_version
 530             if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
 531                 printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
 532                        "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
 533                 dirty_tx += TX_RING_SIZE;
 534             }
 535 #endif
 536
 537             if (priv->tx_full && netif_queue_stopped(dev) &&
 538                 dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
 539                 /* The ring is no longer full. */
 540                 priv->tx_full = 0;
 541                 netif_wake_queue(dev);
 542             }
 543
 544             priv->dirty_tx = dirty_tx;
 545         }
 546
 547         /* Log misc errors. */
 548         if (csr0 & BABL) {
 549             handled = 1;
 550             priv->stats.tx_errors++;    /* Tx babble. */
 551         }
 552         if (csr0 & MISS) {
 553             handled = 1;
 554             priv->stats.rx_errors++;    /* Missed a Rx frame. */
 555         }
 556         if (csr0 & MERR) {
 557             handled = 1;
 558             printk(KERN_ERR "%s: Bus master arbitration failure, status "
 559                    "%4.4x.\n", dev->name, csr0);
 560             /* Restart the chip. */
 561             lance->RDP = STRT;
 562         }
 563     }
 564
 565     /* Clear any other interrupt, and set interrupt enable. */
 566     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 567     lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
 568
 569 #if 0
 570     if (ariadne_debug > 4)
 571         printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
 572                lance->RAP, lance->RDP);
 573 #endif
 574     return IRQ_RETVAL(handled);
 575 }
 576
 577
 578 static void ariadne_tx_timeout(struct net_device *dev)
 579 {
 580     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 581
 582     printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
 583            dev->name, lance->RDP);
 584     ariadne_reset(dev);
 585     netif_wake_queue(dev);
 586 }
 587
 588
 589 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
 590 {
 591     struct ariadne_private *priv = netdev_priv(dev);
 592     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 593     int entry;
 594     unsigned long flags;
 595     int len = skb->len;
 596
 597 #if 0
 598     if (ariadne_debug > 3) {
 599         lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
 600         printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
 601                dev->name, lance->RDP);
 602         lance->RDP = 0x0000;
 603     }
 604 #endif
 605
 606     /* FIXME: is the 79C960 new enough to do its own padding right ? */
 607     if (skb->len < ETH_ZLEN)
 608     {
 609         if (skb_padto(skb, ETH_ZLEN))
 610             return 0;
 611         len = ETH_ZLEN;
 612     }
 613
 614     /* Fill in a Tx ring entry */
 615
 616 #if 0
 617 {
 618     DECLARE_MAC_BUF(mac);
 619     DECLARE_MAC_BUF(mac2);
 620
 621     printk(KERN_DEBUG "TX pkt type 0x%04x from %s to %s "
 622            " data 0x%08x len %d\n",
 623            ((u_short *)skb->data)[6],
 624            print_mac(mac, ((const u8 *)skb->data)+6),
 625            print_mac(mac, (const u8 *)skb->data),
 626            (int)skb->data, (int)skb->len);
 627 }
 628 #endif
 629
 630     local_irq_save(flags);
 631
 632     entry = priv->cur_tx % TX_RING_SIZE;
 633
 634     /* Caution: the write order is important here, set the base address with
 635                 the "ownership" bits last. */
 636
 637     priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
 638     priv->tx_ring[entry]->TMD3 = 0x0000;
 639     memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
 640
 641 #if 0
 642     {
 643         int i, len;
 644
 645         len = skb->len > 64 ? 64 : skb->len;
 646         len >>= 1;
 647         for (i = 0; i < len; i += 8) {
 648             int j;
 649             printk(KERN_DEBUG "%04x:", i);
 650             for (j = 0; (j < 8) && ((i+j) < len); j++) {
 651                 if (!(j & 1))
 652                     printk(" ");
 653                 printk("%04x", priv->tx_buff[entry][i+j]);
 654             }
 655             printk("\n");
 656         }
 657     }
 658 #endif
 659
 660     priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
 661
 662     dev_kfree_skb(skb);
 663
 664     priv->cur_tx++;
 665     if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
 666
 667 #if 0
 668         printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
 669                "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
 670 #endif
 671
 672         priv->cur_tx -= TX_RING_SIZE;
 673         priv->dirty_tx -= TX_RING_SIZE;
 674     }
 675     priv->stats.tx_bytes += len;
 676
 677     /* Trigger an immediate send poll. */
 678     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 679     lance->RDP = INEA|TDMD;
 680
 681     dev->trans_start = jiffies;
 682
 683     if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
 684         netif_stop_queue(dev);
 685         priv->tx_full = 1;
 686     }
 687     local_irq_restore(flags);
 688
 689     return 0;
 690 }
 691
 692
 693 static int ariadne_rx(struct net_device *dev)
 694 {
 695     struct ariadne_private *priv = netdev_priv(dev);
 696     int entry = priv->cur_rx % RX_RING_SIZE;
 697     int i;
 698
 699     /* If we own the next entry, it's a new packet. Send it up. */
 700     while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
 701         int status = lowb(priv->rx_ring[entry]->RMD1);
 702
 703         if (status != (RF_STP|RF_ENP)) {        /* There was an error. */
 704             /* There is a tricky error noted by John Murphy,
 705                 <murf@perftech.com> to Russ Nelson: Even with full-sized
 706                 buffers it's possible for a jabber packet to use two
 707                 buffers, with only the last correctly noting the error. */
 708             if (status & RF_ENP)
 709                 /* Only count a general error at the end of a packet.*/
 710                 priv->stats.rx_errors++;
 711             if (status & RF_FRAM)
 712                 priv->stats.rx_frame_errors++;
 713             if (status & RF_OFLO)
 714                 priv->stats.rx_over_errors++;
 715             if (status & RF_CRC)
 716                 priv->stats.rx_crc_errors++;
 717             if (status & RF_BUFF)
 718                 priv->stats.rx_fifo_errors++;
 719             priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
 720         } else {
 721             /* Malloc up new buffer, compatible with net-3. */
 722             short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
 723             struct sk_buff *skb;
 724
 725             skb = dev_alloc_skb(pkt_len+2);
 726             if (skb == NULL) {
 727                 printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
 728                        dev->name);
 729                 for (i = 0; i < RX_RING_SIZE; i++)
 730                     if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
 731                         break;
 732
 733                 if (i > RX_RING_SIZE-2) {
 734                     priv->stats.rx_dropped++;
 735                     priv->rx_ring[entry]->RMD1 |= RF_OWN;
 736                     priv->cur_rx++;
 737                 }
 738                 break;
 739             }
 740
 741
 742             skb_reserve(skb,2);         /* 16 byte align */
 743             skb_put(skb,pkt_len);       /* Make room */
 744             skb_copy_to_linear_data(skb, (char *)priv->rx_buff[entry], pkt_len);
 745             skb->protocol=eth_type_trans(skb,dev);
 746 #if 0
 747 {
 748             DECLARE_MAC_BUF(mac);
 749
 750             printk(KERN_DEBUG "RX pkt type 0x%04x from ",
 751                    ((u_short *)skb->data)[6]);
 752             {
 753                 u_char *ptr = &((u_char *)skb->data)[6];
 754                 printk("%s", print_mac(mac, ptr));
 755             }
 756             printk(" to ");
 757             {
 758                 u_char *ptr = (u_char *)skb->data;
 759                 printk("%s", print_mac(mac, ptr));
 760             }
 761             printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
 762 }
 763 #endif
 764
 765             netif_rx(skb);
 766             dev->last_rx = jiffies;
 767             priv->stats.rx_packets++;
 768             priv->stats.rx_bytes += pkt_len;
 769         }
 770
 771         priv->rx_ring[entry]->RMD1 |= RF_OWN;
 772         entry = (++priv->cur_rx) % RX_RING_SIZE;
 773     }
 774
 775     priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
 776
 777     /* We should check that at least two ring entries are free.  If not,
 778        we should free one and mark stats->rx_dropped++. */
 779
 780     return 0;
 781 }
 782
 783
 784 static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
 785 {
 786     struct ariadne_private *priv = netdev_priv(dev);
 787     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 788     short saved_addr;
 789     unsigned long flags;
 790
 791     local_irq_save(flags);
 792     saved_addr = lance->RAP;
 793     lance->RAP = CSR112;                /* Missed Frame Count */
 794     priv->stats.rx_missed_errors = swapw(lance->RDP);
 795     lance->RAP = saved_addr;
 796     local_irq_restore(flags);
 797
 798     return &priv->stats;
 799 }
 800
 801
 802 /* Set or clear the multicast filter for this adaptor.
 803     num_addrs == -1     Promiscuous mode, receive all packets
 804     num_addrs == 0      Normal mode, clear multicast list
 805     num_addrs > 0       Multicast mode, receive normal and MC packets, and do
 806                         best-effort filtering.
 807  */
 808 static void set_multicast_list(struct net_device *dev)
 809 {
 810     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 811
 812     if (!netif_running(dev))
 813         return;
 814
 815     netif_stop_queue(dev);
 816
 817     /* We take the simple way out and always enable promiscuous mode. */
 818     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 819     lance->RDP = STOP;                  /* Temporarily stop the lance. */
 820     ariadne_init_ring(dev);
 821
 822     if (dev->flags & IFF_PROMISC) {
 823         lance->RAP = CSR15;             /* Mode Register */
 824         lance->RDP = PROM;              /* Set promiscuous mode */
 825     } else {
 826         short multicast_table[4];
 827         int num_addrs = dev->mc_count;
 828         int i;
 829         /* We don't use the multicast table, but rely on upper-layer filtering. */
 830         memset(multicast_table, (num_addrs == 0) ? 0 : -1,
 831                sizeof(multicast_table));
 832         for (i = 0; i < 4; i++) {
 833             lance->RAP = CSR8+(i<<8);   /* Logical Address Filter */
 834             lance->RDP = swapw(multicast_table[i]);
 835         }
 836         lance->RAP = CSR15;             /* Mode Register */
 837         lance->RDP = 0x0000;            /* Unset promiscuous mode */
 838     }
 839
 840     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 841     lance->RDP = INEA|STRT|IDON;        /* Resume normal operation. */
 842
 843     netif_wake_queue(dev);
 844 }
 845
 846
 847 static void __devexit ariadne_remove_one(struct zorro_dev *z)
 848 {
 849     struct net_device *dev = zorro_get_drvdata(z);
 850
 851     unregister_netdev(dev);
 852     release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
 853     release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
 854     free_netdev(dev);
 855 }
 856
 857 static int __init ariadne_init_module(void)
 858 {
 859     return zorro_register_driver(&ariadne_driver);
 860 }
 861
 862 static void __exit ariadne_cleanup_module(void)
 863 {
 864     zorro_unregister_driver(&ariadne_driver);
 865 }
 866
 867 module_init(ariadne_init_module);
 868 module_exit(ariadne_cleanup_module);
 869
 870 MODULE_LICENSE("GPL");