drivers/net/3c523.c

   1 /*
   2    net-3-driver for the 3c523 Etherlink/MC card (i82586 Ethernet chip)
   3
   4
   5    This is an extension to the Linux operating system, and is covered by the
   6    same GNU General Public License that covers that work.
   7
   8    Copyright 1995, 1996 by Chris Beauregard (cpbeaure@undergrad.math.uwaterloo.ca)
   9
  10    This is basically Michael Hipp's ni52 driver, with a new probing
  11    algorithm and some minor changes to the 82586 CA and reset routines.
  12    Thanks a lot Michael for a really clean i82586 implementation!  Unless
  13    otherwise documented in ni52.c, any bugs are mine.
  14
  15    Contrary to the Ethernet-HOWTO, this isn't based on the 3c507 driver in
  16    any way.  The ni52 is a lot easier to modify.
  17
  18    sources:
  19    ni52.c
  20
  21    Crynwr packet driver collection was a great reference for my first
  22    attempt at this sucker.  The 3c507 driver also helped, until I noticed
  23    that ni52.c was a lot nicer.
  24
  25    EtherLink/MC: Micro Channel Ethernet Adapter Technical Reference
  26    Manual, courtesy of 3Com CardFacts, documents the 3c523-specific
  27    stuff.  Information on CardFacts is found in the Ethernet HOWTO.
  28    Also see <a href="http://www.3com.com/">
  29
  30    Microprocessor Communications Support Chips, T.J. Byers, ISBN
  31    0-444-01224-9, has a section on the i82586.  It tells you just enough
  32    to know that you really don't want to learn how to program the chip.
  33
  34    The original device probe code was stolen from ps2esdi.c
  35
  36    Known Problems:
  37    Since most of the code was stolen from ni52.c, you'll run across the
  38    same bugs in the 0.62 version of ni52.c, plus maybe a few because of
  39    the 3c523 idiosynchacies.  The 3c523 has 16K of RAM though, so there
  40    shouldn't be the overrun problem that the 8K ni52 has.
  41
  42    This driver is for a 16K adapter.  It should work fine on the 64K
  43    adapters, but it will only use one of the 4 banks of RAM.  Modifying
  44    this for the 64K version would require a lot of heinous bank
  45    switching, which I'm sure not interested in doing.  If you try to
  46    implement a bank switching version, you'll basically have to remember
  47    what bank is enabled and do a switch everytime you access a memory
  48    location that's not current.  You'll also have to remap pointers on
  49    the driver side, because it only knows about 16K of the memory.
  50    Anyone desperate or masochistic enough to try?
  51
  52    It seems to be stable now when multiple transmit buffers are used.  I
  53    can't see any performance difference, but then I'm working on a 386SX.
  54
  55    Multicast doesn't work.  It doesn't even pretend to work.  Don't use
  56    it.  Don't compile your kernel with multicast support.  I don't know
  57    why.
  58
  59    Features:
  60    This driver is useable as a loadable module.  If you try to specify an
  61    IRQ or a IO address (via insmod 3c523.o irq=xx io=0xyyy), it will
  62    search the MCA slots until it finds a 3c523 with the specified
  63    parameters.
  64
  65    This driver does support multiple ethernet cards when used as a module
  66    (up to MAX_3C523_CARDS, the default being 4)
  67
  68    This has been tested with both BNC and TP versions, internal and
  69    external transceivers.  Haven't tested with the 64K version (that I
  70    know of).
  71
  72    History:
  73    Jan 1st, 1996
  74    first public release
  75    Feb 4th, 1996
  76    update to 1.3.59, incorporated multicast diffs from ni52.c
  77    Feb 15th, 1996
  78    added shared irq support
  79    Apr 1999
  80    added support for multiple cards when used as a module
  81    added option to disable multicast as is causes problems
  82        Ganesh Sittampalam <ganesh.sittampalam@magdalen.oxford.ac.uk>
  83        Stuart Adamson <stuart.adamson@compsoc.net>
  84    Nov 2001
  85    added support for ethtool (jgarzik)
  86
  87    $Header: /fsys2/home/chrisb/linux-1.3.59-MCA/drivers/net/RCS/3c523.c,v 1.1 1996/02/05 01:53:46 chrisb Exp chrisb $
  88  */
  89
  90 #define DRV_NAME                "3c523"
  91 #define DRV_VERSION             "17-Nov-2001"
  92
  93 #include <linux/init.h>
  94 #include <linux/netdevice.h>
  95 #include <linux/etherdevice.h>
  96 #include <linux/module.h>
  97 #include <linux/kernel.h>
  98 #include <linux/string.h>
  99 #include <linux/errno.h>
 100 #include <linux/ioport.h>
 101 #include <linux/skbuff.h>
 102 #include <linux/slab.h>
 103 #include <linux/interrupt.h>
 104 #include <linux/delay.h>
 105 #include <linux/mca-legacy.h>
 106 #include <linux/ethtool.h>
 107 #include <linux/bitops.h>
 108 #include <linux/jiffies.h>
 109
 110 #include <asm/uaccess.h>
 111 #include <asm/processor.h>
 112 #include <asm/io.h>
 113
 114 #include "3c523.h"
 115
 116 /*************************************************************************/
 117 #define DEBUG                   /* debug on */
 118 #define SYSBUSVAL 0             /* 1 = 8 Bit, 0 = 16 bit - 3c523 only does 16 bit */
 119 #undef ELMC_MULTICAST           /* Disable multicast support as it is somewhat seriously broken at the moment */
 120
 121 #define make32(ptr16) (p->memtop + (short) (ptr16) )
 122 #define make24(ptr32) ((char *) (ptr32) - p->base)
 123 #define make16(ptr32) ((unsigned short) ((unsigned long) (ptr32) - (unsigned long) p->memtop ))
 124
 125 /*************************************************************************/
 126 /*
 127    Tables to which we can map values in the configuration registers.
 128  */
 129 static int irq_table[] __initdata = {
 130         12, 7, 3, 9
 131 };
 132
 133 static int csr_table[] __initdata = {
 134         0x300, 0x1300, 0x2300, 0x3300
 135 };
 136
 137 static int shm_table[] __initdata = {
 138         0x0c0000, 0x0c8000, 0x0d0000, 0x0d8000
 139 };
 140
 141 /******************* how to calculate the buffers *****************************
 142
 143
 144   * IMPORTANT NOTE: if you configure only one NUM_XMIT_BUFFS, the driver works
 145   * --------------- in a different (more stable?) mode. Only in this mode it's
 146   *                 possible to configure the driver with 'NO_NOPCOMMANDS'
 147
 148 sizeof(scp)=12; sizeof(scb)=16; sizeof(iscp)=8;
 149 sizeof(scp)+sizeof(iscp)+sizeof(scb) = 36 = INIT
 150 sizeof(rfd) = 24; sizeof(rbd) = 12;
 151 sizeof(tbd) = 8; sizeof(transmit_cmd) = 16;
 152 sizeof(nop_cmd) = 8;
 153
 154   * if you don't know the driver, better do not change this values: */
 155
 156 #define RECV_BUFF_SIZE 1524     /* slightly oversized */
 157 #define XMIT_BUFF_SIZE 1524     /* slightly oversized */
 158 #define NUM_XMIT_BUFFS 1        /* config for both, 8K and 16K shmem */
 159 #define NUM_RECV_BUFFS_8  4     /* config for 8K shared mem */
 160 #define NUM_RECV_BUFFS_16 9     /* config for 16K shared mem */
 161
 162 #if (NUM_XMIT_BUFFS == 1)
 163 #define NO_NOPCOMMANDS          /* only possible with NUM_XMIT_BUFFS=1 */
 164 #endif
 165
 166 /**************************************************************************/
 167
 168 #define DELAY(x) { mdelay(32 * x); }
 169
 170 /* a much shorter delay: */
 171 #define DELAY_16(); { udelay(16) ; }
 172
 173 /* wait for command with timeout: */
 174 #define WAIT_4_SCB_CMD() { int i; \
 175   for(i=0;i<1024;i++) { \
 176     if(!p->scb->cmd) break; \
 177     DELAY_16(); \
 178     if(i == 1023) { \
 179       printk(KERN_WARNING "%s:%d: scb_cmd timed out .. resetting i82586\n",\
 180         dev->name,__LINE__); \
 181       elmc_id_reset586(); } } }
 182
 183 static irqreturn_t elmc_interrupt(int irq, void *dev_id);
 184 static int elmc_open(struct net_device *dev);
 185 static int elmc_close(struct net_device *dev);
 186 static int elmc_send_packet(struct sk_buff *, struct net_device *);
 187 static struct net_device_stats *elmc_get_stats(struct net_device *dev);
 188 static void elmc_timeout(struct net_device *dev);
 189 #ifdef ELMC_MULTICAST
 190 static void set_multicast_list(struct net_device *dev);
 191 #endif
 192 static const struct ethtool_ops netdev_ethtool_ops;
 193
 194 /* helper-functions */
 195 static int init586(struct net_device *dev);
 196 static int check586(struct net_device *dev, unsigned long where, unsigned size);
 197 static void alloc586(struct net_device *dev);
 198 static void startrecv586(struct net_device *dev);
 199 static void *alloc_rfa(struct net_device *dev, void *ptr);
 200 static void elmc_rcv_int(struct net_device *dev);
 201 static void elmc_xmt_int(struct net_device *dev);
 202 static void elmc_rnr_int(struct net_device *dev);
 203
 204 struct priv {
 205         unsigned long base;
 206         char *memtop;
 207         unsigned long mapped_start;             /* Start of ioremap */
 208         volatile struct rfd_struct *rfd_last, *rfd_top, *rfd_first;
 209         volatile struct scp_struct *scp;        /* volatile is important */
 210         volatile struct iscp_struct *iscp;      /* volatile is important */
 211         volatile struct scb_struct *scb;        /* volatile is important */
 212         volatile struct tbd_struct *xmit_buffs[NUM_XMIT_BUFFS];
 213 #if (NUM_XMIT_BUFFS == 1)
 214         volatile struct transmit_cmd_struct *xmit_cmds[2];
 215         volatile struct nop_cmd_struct *nop_cmds[2];
 216 #else
 217         volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS];
 218         volatile struct nop_cmd_struct *nop_cmds[NUM_XMIT_BUFFS];
 219 #endif
 220         volatile int nop_point, num_recv_buffs;
 221         volatile char *xmit_cbuffs[NUM_XMIT_BUFFS];
 222         volatile int xmit_count, xmit_last;
 223         volatile int slot;
 224 };
 225
 226 #define elmc_attn586()  {elmc_do_attn586(dev->base_addr,ELMC_CTRL_INTE);}
 227 #define elmc_reset586() {elmc_do_reset586(dev->base_addr,ELMC_CTRL_INTE);}
 228
 229 /* with interrupts disabled - this will clear the interrupt bit in the
 230    3c523 control register, and won't put it back.  This effectively
 231    disables interrupts on the card. */
 232 #define elmc_id_attn586()  {elmc_do_attn586(dev->base_addr,0);}
 233 #define elmc_id_reset586() {elmc_do_reset586(dev->base_addr,0);}
 234
 235 /*************************************************************************/
 236 /*
 237    Do a Channel Attention on the 3c523.  This is extremely board dependent.
 238  */
 239 static void elmc_do_attn586(int ioaddr, int ints)
 240 {
 241         /* the 3c523 requires a minimum of 500 ns.  The delays here might be
 242            a little too large, and hence they may cut the performance of the
 243            card slightly.  If someone who knows a little more about Linux
 244            timing would care to play with these, I'd appreciate it. */
 245
 246         /* this bit masking stuff is crap.  I'd rather have separate
 247            registers with strobe triggers for each of these functions.  <sigh>
 248            Ya take what ya got. */
 249
 250         outb(ELMC_CTRL_RST | 0x3 | ELMC_CTRL_CA | ints, ioaddr + ELMC_CTRL);
 251         DELAY_16();             /* > 500 ns */
 252         outb(ELMC_CTRL_RST | 0x3 | ints, ioaddr + ELMC_CTRL);
 253 }
 254
 255 /*************************************************************************/
 256 /*
 257    Reset the 82586 on the 3c523.  Also very board dependent.
 258  */
 259 static void elmc_do_reset586(int ioaddr, int ints)
 260 {
 261         /* toggle the RST bit low then high */
 262         outb(0x3 | ELMC_CTRL_LBK, ioaddr + ELMC_CTRL);
 263         DELAY_16();             /* > 500 ns */
 264         outb(ELMC_CTRL_RST | ELMC_CTRL_LBK | 0x3, ioaddr + ELMC_CTRL);
 265
 266         elmc_do_attn586(ioaddr, ints);
 267 }
 268
 269 /**********************************************
 270  * close device
 271  */
 272
 273 static int elmc_close(struct net_device *dev)
 274 {
 275         netif_stop_queue(dev);
 276         elmc_id_reset586();     /* the hard way to stop the receiver */
 277         free_irq(dev->irq, dev);
 278         return 0;
 279 }
 280
 281 /**********************************************
 282  * open device
 283  */
 284
 285 static int elmc_open(struct net_device *dev)
 286 {
 287         int ret;
 288
 289         elmc_id_attn586();      /* disable interrupts */
 290
 291         ret = request_irq(dev->irq, &elmc_interrupt, IRQF_SHARED | IRQF_SAMPLE_RANDOM,
 292                           dev->name, dev);
 293         if (ret) {
 294                 printk(KERN_ERR "%s: couldn't get irq %d\n", dev->name, dev->irq);
 295                 elmc_id_reset586();
 296                 return ret;
 297         }
 298         alloc586(dev);
 299         init586(dev);
 300         startrecv586(dev);
 301         netif_start_queue(dev);
 302         return 0;               /* most done by init */
 303 }
 304
 305 /**********************************************
 306  * Check to see if there's an 82586 out there.
 307  */
 308
 309 static int __init check586(struct net_device *dev, unsigned long where, unsigned size)
 310 {
 311         struct priv *p = netdev_priv(dev);
 312         char *iscp_addrs[2];
 313         int i = 0;
 314
 315         p->base = (unsigned long) isa_bus_to_virt((unsigned long)where) + size - 0x01000000;
 316         p->memtop = isa_bus_to_virt((unsigned long)where) + size;
 317         p->scp = (struct scp_struct *)(p->base + SCP_DEFAULT_ADDRESS);
 318         memset((char *) p->scp, 0, sizeof(struct scp_struct));
 319         p->scp->sysbus = SYSBUSVAL;     /* 1 = 8Bit-Bus, 0 = 16 Bit */
 320
 321         iscp_addrs[0] = isa_bus_to_virt((unsigned long)where);
 322         iscp_addrs[1] = (char *) p->scp - sizeof(struct iscp_struct);
 323
 324         for (i = 0; i < 2; i++) {
 325                 p->iscp = (struct iscp_struct *) iscp_addrs[i];
 326                 memset((char *) p->iscp, 0, sizeof(struct iscp_struct));
 327
 328                 p->scp->iscp = make24(p->iscp);
 329                 p->iscp->busy = 1;
 330
 331                 elmc_id_reset586();
 332
 333                 /* reset586 does an implicit CA */
 334
 335                 /* apparently, you sometimes have to kick the 82586 twice... */
 336                 elmc_id_attn586();
 337                 DELAY(1);
 338
 339                 if (p->iscp->busy) {    /* i82586 clears 'busy' after successful init */
 340                         return 0;
 341                 }
 342         }
 343         return 1;
 344 }
 345
 346 /******************************************************************
 347  * set iscp at the right place, called by elmc_probe and open586.
 348  */
 349
 350 static void alloc586(struct net_device *dev)
 351 {
 352         struct priv *p = netdev_priv(dev);
 353
 354         elmc_id_reset586();
 355         DELAY(2);
 356
 357         p->scp = (struct scp_struct *) (p->base + SCP_DEFAULT_ADDRESS);
 358         p->scb = (struct scb_struct *) isa_bus_to_virt(dev->mem_start);
 359         p->iscp = (struct iscp_struct *) ((char *) p->scp - sizeof(struct iscp_struct));
 360
 361         memset((char *) p->iscp, 0, sizeof(struct iscp_struct));
 362         memset((char *) p->scp, 0, sizeof(struct scp_struct));
 363
 364         p->scp->iscp = make24(p->iscp);
 365         p->scp->sysbus = SYSBUSVAL;
 366         p->iscp->scb_offset = make16(p->scb);
 367
 368         p->iscp->busy = 1;
 369         elmc_id_reset586();
 370         elmc_id_attn586();
 371
 372         DELAY(2);
 373
 374         if (p->iscp->busy) {
 375                 printk(KERN_ERR "%s: Init-Problems (alloc).\n", dev->name);
 376         }
 377         memset((char *) p->scb, 0, sizeof(struct scb_struct));
 378 }
 379
 380 /*****************************************************************/
 381
 382 static int elmc_getinfo(char *buf, int slot, void *d)
 383 {
 384         int len = 0;
 385         struct net_device *dev = d;
 386
 387         if (dev == NULL)
 388                 return len;
 389
 390         len += sprintf(buf + len, "Revision: 0x%x\n",
 391                        inb(dev->base_addr + ELMC_REVISION) & 0xf);
 392         len += sprintf(buf + len, "IRQ: %d\n", dev->irq);
 393         len += sprintf(buf + len, "IO Address: %#lx-%#lx\n", dev->base_addr,
 394                        dev->base_addr + ELMC_IO_EXTENT);
 395         len += sprintf(buf + len, "Memory: %#lx-%#lx\n", dev->mem_start,
 396                        dev->mem_end - 1);
 397         len += sprintf(buf + len, "Transceiver: %s\n", dev->if_port ?
 398                        "External" : "Internal");
 399         len += sprintf(buf + len, "Device: %s\n", dev->name);
 400         len += sprintf(buf + len, "Hardware Address: %pM\n",
 401                        dev->dev_addr);
 402
 403         return len;
 404 }                               /* elmc_getinfo() */
 405
 406 static const struct net_device_ops netdev_ops = {
 407         .ndo_open               = elmc_open,
 408         .ndo_stop               = elmc_close,
 409         .ndo_get_stats          = elmc_get_stats,
 410         .ndo_start_xmit         = elmc_send_packet,
 411         .ndo_tx_timeout         = elmc_timeout,
 412 #ifdef ELMC_MULTICAST
 413         .ndo_set_multicast_list = set_multicast_list,
 414 #endif
 415         .ndo_change_mtu         = eth_change_mtu,
 416         .ndo_set_mac_address    = eth_mac_addr,
 417         .ndo_validate_addr      = eth_validate_addr,
 418 };
 419
 420 /*****************************************************************/
 421
 422 static int __init do_elmc_probe(struct net_device *dev)
 423 {
 424         static int slot;
 425         int base_addr = dev->base_addr;
 426         int irq = dev->irq;
 427         u_char status = 0;
 428         u_char revision = 0;
 429         int i = 0;
 430         unsigned int size = 0;
 431         int retval;
 432         struct priv *pr = netdev_priv(dev);
 433
 434         if (MCA_bus == 0) {
 435                 return -ENODEV;
 436         }
 437         /* search through the slots for the 3c523. */
 438         slot = mca_find_adapter(ELMC_MCA_ID, 0);
 439         while (slot != -1) {
 440                 status = mca_read_stored_pos(slot, 2);
 441
 442                 dev->irq=irq_table[(status & ELMC_STATUS_IRQ_SELECT) >> 6];
 443                 dev->base_addr=csr_table[(status & ELMC_STATUS_CSR_SELECT) >> 1];
 444
 445                 /*
 446                    If we're trying to match a specified irq or IO address,
 447                    we'll reject a match unless it's what we're looking for.
 448                    Also reject it if the card is already in use.
 449                  */
 450
 451                 if ((irq && irq != dev->irq) ||
 452                     (base_addr && base_addr != dev->base_addr)) {
 453                         slot = mca_find_adapter(ELMC_MCA_ID, slot + 1);
 454                         continue;
 455                 }
 456                 if (!request_region(dev->base_addr, ELMC_IO_EXTENT, DRV_NAME)) {
 457                         slot = mca_find_adapter(ELMC_MCA_ID, slot + 1);
 458                         continue;
 459                 }
 460
 461                 /* found what we're looking for... */
 462                 break;
 463         }
 464
 465         /* we didn't find any 3c523 in the slots we checked for */
 466         if (slot == MCA_NOTFOUND)
 467                 return ((base_addr || irq) ? -ENXIO : -ENODEV);
 468
 469         mca_set_adapter_name(slot, "3Com 3c523 Etherlink/MC");
 470         mca_set_adapter_procfn(slot, (MCA_ProcFn) elmc_getinfo, dev);
 471
 472         /* if we get this far, adapter has been found - carry on */
 473         printk(KERN_INFO "%s: 3c523 adapter found in slot %d\n", dev->name, slot + 1);
 474
 475         /* Now we extract configuration info from the card.
 476            The 3c523 provides information in two of the POS registers, but
 477            the second one is only needed if we want to tell the card what IRQ
 478            to use.  I suspect that whoever sets the thing up initially would
 479            prefer we don't screw with those things.
 480
 481            Note that we read the status info when we found the card...
 482
 483            See 3c523.h for more details.
 484          */
 485
 486         /* revision is stored in the first 4 bits of the revision register */
 487         revision = inb(dev->base_addr + ELMC_REVISION) & 0xf;
 488
 489         /* according to docs, we read the interrupt and write it back to
 490            the IRQ select register, since the POST might not configure the IRQ
 491            properly. */
 492         switch (dev->irq) {
 493         case 3:
 494                 mca_write_pos(slot, 3, 0x04);
 495                 break;
 496         case 7:
 497                 mca_write_pos(slot, 3, 0x02);
 498                 break;
 499         case 9:
 500                 mca_write_pos(slot, 3, 0x08);
 501                 break;
 502         case 12:
 503                 mca_write_pos(slot, 3, 0x01);
 504                 break;
 505         }
 506
 507         memset(pr, 0, sizeof(struct priv));
 508         pr->slot = slot;
 509
 510         printk(KERN_INFO "%s: 3Com 3c523 Rev 0x%x at %#lx\n", dev->name, (int) revision,
 511                dev->base_addr);
 512
 513         /* Determine if we're using the on-board transceiver (i.e. coax) or
 514            an external one.  The information is pretty much useless, but I
 515            guess it's worth brownie points. */
 516         dev->if_port = (status & ELMC_STATUS_DISABLE_THIN);
 517
 518         /* The 3c523 has a 24K chunk of memory.  The first 16K is the
 519            shared memory, while the last 8K is for the EtherStart BIOS ROM.
 520            Which we don't care much about here.  We'll just tell Linux that
 521            we're using 16K.  MCA won't permit address space conflicts caused
 522            by not mapping the other 8K. */
 523         dev->mem_start = shm_table[(status & ELMC_STATUS_MEMORY_SELECT) >> 3];
 524
 525         /* We're using MCA, so it's a given that the information about memory
 526            size is correct.  The Crynwr drivers do something like this. */
 527
 528         elmc_id_reset586();     /* seems like a good idea before checking it... */
 529
 530         size = 0x4000;          /* check for 16K mem */
 531         if (!check586(dev, dev->mem_start, size)) {
 532                 printk(KERN_ERR "%s: memprobe, Can't find memory at 0x%lx!\n", dev->name,
 533                        dev->mem_start);
 534                 retval = -ENODEV;
 535                 goto err_out;
 536         }
 537         dev->mem_end = dev->mem_start + size;   /* set mem_end showed by 'ifconfig' */
 538
 539         pr->memtop = isa_bus_to_virt(dev->mem_start) + size;
 540         pr->base = (unsigned long) isa_bus_to_virt(dev->mem_start) + size - 0x01000000;
 541         alloc586(dev);
 542
 543         elmc_id_reset586();     /* make sure it doesn't generate spurious ints */
 544
 545         /* set number of receive-buffs according to memsize */
 546         pr->num_recv_buffs = NUM_RECV_BUFFS_16;
 547
 548         /* dump all the assorted information */
 549         printk(KERN_INFO "%s: IRQ %d, %sternal xcvr, memory %#lx-%#lx.\n", dev->name,
 550                dev->irq, dev->if_port ? "ex" : "in",
 551                dev->mem_start, dev->mem_end - 1);
 552
 553         /* The hardware address for the 3c523 is stored in the first six
 554            bytes of the IO address. */
 555         for (i = 0; i < 6; i++)
 556                 dev->dev_addr[i] = inb(dev->base_addr + i);
 557
 558         printk(KERN_INFO "%s: hardware address %pM\n",
 559                dev->name, dev->dev_addr);
 560
 561         dev->netdev_ops = &netdev_ops;
 562         dev->watchdog_timeo = HZ;
 563         dev->ethtool_ops = &netdev_ethtool_ops;
 564
 565         /* note that we haven't actually requested the IRQ from the kernel.
 566            That gets done in elmc_open().  I'm not sure that's such a good idea,
 567            but it works, so I'll go with it. */
 568
 569 #ifndef ELMC_MULTICAST
 570         dev->flags&=~IFF_MULTICAST;     /* Multicast doesn't work */
 571 #endif
 572
 573         retval = register_netdev(dev);
 574         if (retval)
 575                 goto err_out;
 576
 577         return 0;
 578 err_out:
 579         mca_set_adapter_procfn(slot, NULL, NULL);
 580         release_region(dev->base_addr, ELMC_IO_EXTENT);
 581         return retval;
 582 }
 583
 584 #ifdef MODULE
 585 static void cleanup_card(struct net_device *dev)
 586 {
 587         mca_set_adapter_procfn(((struct priv *)netdev_priv(dev))->slot,
 588                                 NULL, NULL);
 589         release_region(dev->base_addr, ELMC_IO_EXTENT);
 590 }
 591 #else
 592 struct net_device * __init elmc_probe(int unit)
 593 {
 594         struct net_device *dev = alloc_etherdev(sizeof(struct priv));
 595         int err;
 596
 597         if (!dev)
 598                 return ERR_PTR(-ENOMEM);
 599
 600         sprintf(dev->name, "eth%d", unit);
 601         netdev_boot_setup_check(dev);
 602
 603         err = do_elmc_probe(dev);
 604         if (err)
 605                 goto out;
 606         return dev;
 607 out:
 608         free_netdev(dev);
 609         return ERR_PTR(err);
 610 }
 611 #endif
 612
 613 /**********************************************
 614  * init the chip (elmc-interrupt should be disabled?!)
 615  * needs a correct 'allocated' memory
 616  */
 617
 618 static int init586(struct net_device *dev)
 619 {
 620         void *ptr;
 621         unsigned long s;
 622         int i, result = 0;
 623         struct priv *p = netdev_priv(dev);
 624         volatile struct configure_cmd_struct *cfg_cmd;
 625         volatile struct iasetup_cmd_struct *ias_cmd;
 626         volatile struct tdr_cmd_struct *tdr_cmd;
 627         volatile struct mcsetup_cmd_struct *mc_cmd;
 628         struct dev_mc_list *dmi = dev->mc_list;
 629         int num_addrs = dev->mc_count;
 630
 631         ptr = (void *) ((char *) p->scb + sizeof(struct scb_struct));
 632
 633         cfg_cmd = (struct configure_cmd_struct *) ptr;  /* configure-command */
 634         cfg_cmd->cmd_status = 0;
 635         cfg_cmd->cmd_cmd = CMD_CONFIGURE | CMD_LAST;
 636         cfg_cmd->cmd_link = 0xffff;
 637
 638         cfg_cmd->byte_cnt = 0x0a;       /* number of cfg bytes */
 639         cfg_cmd->fifo = 0x08;   /* fifo-limit (8=tx:32/rx:64) */
 640         cfg_cmd->sav_bf = 0x40; /* hold or discard bad recv frames (bit 7) */
 641         cfg_cmd->adr_len = 0x2e;        /* addr_len |!src_insert |pre-len |loopback */
 642         cfg_cmd->priority = 0x00;
 643         cfg_cmd->ifs = 0x60;
 644         cfg_cmd->time_low = 0x00;
 645         cfg_cmd->time_high = 0xf2;
 646         cfg_cmd->promisc = 0;
 647         if (dev->flags & (IFF_ALLMULTI | IFF_PROMISC))
 648                 cfg_cmd->promisc = 1;
 649         cfg_cmd->carr_coll = 0x00;
 650
 651         p->scb->cbl_offset = make16(cfg_cmd);
 652
 653         p->scb->cmd = CUC_START;        /* cmd.-unit start */
 654         elmc_id_attn586();
 655
 656         s = jiffies;            /* warning: only active with interrupts on !! */
 657         while (!(cfg_cmd->cmd_status & STAT_COMPL)) {
 658                 if (time_after(jiffies, s + 30*HZ/100))
 659                         break;
 660         }
 661
 662         if ((cfg_cmd->cmd_status & (STAT_OK | STAT_COMPL)) != (STAT_COMPL | STAT_OK)) {
 663                 printk(KERN_WARNING "%s (elmc): configure command failed: %x\n", dev->name, cfg_cmd->cmd_status);
 664                 return 1;
 665         }
 666         /*
 667          * individual address setup
 668          */
 669         ias_cmd = (struct iasetup_cmd_struct *) ptr;
 670
 671         ias_cmd->cmd_status = 0;
 672         ias_cmd->cmd_cmd = CMD_IASETUP | CMD_LAST;
 673         ias_cmd->cmd_link = 0xffff;
 674
 675         memcpy((char *) &ias_cmd->iaddr, (char *) dev->dev_addr, ETH_ALEN);
 676
 677         p->scb->cbl_offset = make16(ias_cmd);
 678
 679         p->scb->cmd = CUC_START;        /* cmd.-unit start */
 680         elmc_id_attn586();
 681
 682         s = jiffies;
 683         while (!(ias_cmd->cmd_status & STAT_COMPL)) {
 684                 if (time_after(jiffies, s + 30*HZ/100))
 685                         break;
 686         }
 687
 688         if ((ias_cmd->cmd_status & (STAT_OK | STAT_COMPL)) != (STAT_OK | STAT_COMPL)) {
 689                 printk(KERN_WARNING "%s (elmc): individual address setup command failed: %04x\n", dev->name, ias_cmd->cmd_status);
 690                 return 1;
 691         }
 692         /*
 693          * TDR, wire check .. e.g. no resistor e.t.c
 694          */
 695         tdr_cmd = (struct tdr_cmd_struct *) ptr;
 696
 697         tdr_cmd->cmd_status = 0;
 698         tdr_cmd->cmd_cmd = CMD_TDR | CMD_LAST;
 699         tdr_cmd->cmd_link = 0xffff;
 700         tdr_cmd->status = 0;
 701
 702         p->scb->cbl_offset = make16(tdr_cmd);
 703
 704         p->scb->cmd = CUC_START;        /* cmd.-unit start */
 705         elmc_attn586();
 706
 707         s = jiffies;
 708         while (!(tdr_cmd->cmd_status & STAT_COMPL)) {
 709                 if (time_after(jiffies, s + 30*HZ/100)) {
 710                         printk(KERN_WARNING "%s: %d Problems while running the TDR.\n", dev->name, __LINE__);
 711                         result = 1;
 712                         break;
 713                 }
 714         }
 715
 716         if (!result) {
 717                 DELAY(2);       /* wait for result */
 718                 result = tdr_cmd->status;
 719
 720                 p->scb->cmd = p->scb->status & STAT_MASK;
 721                 elmc_id_attn586();      /* ack the interrupts */
 722
 723                 if (result & TDR_LNK_OK) {
 724                         /* empty */
 725                 } else if (result & TDR_XCVR_PRB) {
 726                         printk(KERN_WARNING "%s: TDR: Transceiver problem!\n", dev->name);
 727                 } else if (result & TDR_ET_OPN) {
 728                         printk(KERN_WARNING "%s: TDR: No correct termination %d clocks away.\n", dev->name, result & TDR_TIMEMASK);
 729                 } else if (result & TDR_ET_SRT) {
 730                         if (result & TDR_TIMEMASK)      /* time == 0 -> strange :-) */
 731                                 printk(KERN_WARNING "%s: TDR: Detected a short circuit %d clocks away.\n", dev->name, result & TDR_TIMEMASK);
 732                 } else {
 733                         printk(KERN_WARNING "%s: TDR: Unknown status %04x\n", dev->name, result);
 734                 }
 735         }
 736         /*
 737          * ack interrupts
 738          */
 739         p->scb->cmd = p->scb->status & STAT_MASK;
 740         elmc_id_attn586();
 741
 742         /*
 743          * alloc nop/xmit-cmds
 744          */
 745 #if (NUM_XMIT_BUFFS == 1)
 746         for (i = 0; i < 2; i++) {
 747                 p->nop_cmds[i] = (struct nop_cmd_struct *) ptr;
 748                 p->nop_cmds[i]->cmd_cmd = CMD_NOP;
 749                 p->nop_cmds[i]->cmd_status = 0;
 750                 p->nop_cmds[i]->cmd_link = make16((p->nop_cmds[i]));
 751                 ptr = (char *) ptr + sizeof(struct nop_cmd_struct);
 752         }
 753         p->xmit_cmds[0] = (struct transmit_cmd_struct *) ptr;   /* transmit cmd/buff 0 */
 754         ptr = (char *) ptr + sizeof(struct transmit_cmd_struct);
 755 #else
 756         for (i = 0; i < NUM_XMIT_BUFFS; i++) {
 757                 p->nop_cmds[i] = (struct nop_cmd_struct *) ptr;
 758                 p->nop_cmds[i]->cmd_cmd = CMD_NOP;
 759                 p->nop_cmds[i]->cmd_status = 0;
 760                 p->nop_cmds[i]->cmd_link = make16((p->nop_cmds[i]));
 761                 ptr = (char *) ptr + sizeof(struct nop_cmd_struct);
 762                 p->xmit_cmds[i] = (struct transmit_cmd_struct *) ptr;   /*transmit cmd/buff 0 */
 763                 ptr = (char *) ptr + sizeof(struct transmit_cmd_struct);
 764         }
 765 #endif
 766
 767         ptr = alloc_rfa(dev, (void *) ptr);     /* init receive-frame-area */
 768
 769         /*
 770          * Multicast setup
 771          */
 772
 773         if (dev->mc_count) {
 774                 /* I don't understand this: do we really need memory after the init? */
 775                 int len = ((char *) p->iscp - (char *) ptr - 8) / 6;
 776                 if (len <= 0) {
 777                         printk(KERN_ERR "%s: Ooooops, no memory for MC-Setup!\n", dev->name);
 778                 } else {
 779                         if (len < num_addrs) {
 780                                 num_addrs = len;
 781                                 printk(KERN_WARNING "%s: Sorry, can only apply %d MC-Address(es).\n",
 782                                        dev->name, num_addrs);
 783                         }
 784                         mc_cmd = (struct mcsetup_cmd_struct *) ptr;
 785                         mc_cmd->cmd_status = 0;
 786                         mc_cmd->cmd_cmd = CMD_MCSETUP | CMD_LAST;
 787                         mc_cmd->cmd_link = 0xffff;
 788                         mc_cmd->mc_cnt = num_addrs * 6;
 789                         for (i = 0; i < num_addrs; i++) {
 790                                 memcpy((char *) mc_cmd->mc_list[i], dmi->dmi_addr, 6);
 791                                 dmi = dmi->next;
 792                         }
 793                         p->scb->cbl_offset = make16(mc_cmd);
 794                         p->scb->cmd = CUC_START;
 795                         elmc_id_attn586();
 796                         s = jiffies;
 797                         while (!(mc_cmd->cmd_status & STAT_COMPL)) {
 798                                 if (time_after(jiffies, s + 30*HZ/100))
 799                                         break;
 800                         }
 801                         if (!(mc_cmd->cmd_status & STAT_COMPL)) {
 802                                 printk(KERN_WARNING "%s: Can't apply multicast-address-list.\n", dev->name);
 803                         }
 804                 }
 805         }
 806         /*
 807          * alloc xmit-buffs / init xmit_cmds
 808          */
 809         for (i = 0; i < NUM_XMIT_BUFFS; i++) {
 810                 p->xmit_cbuffs[i] = (char *) ptr;       /* char-buffs */
 811                 ptr = (char *) ptr + XMIT_BUFF_SIZE;
 812                 p->xmit_buffs[i] = (struct tbd_struct *) ptr;   /* TBD */
 813                 ptr = (char *) ptr + sizeof(struct tbd_struct);
 814                 if ((void *) ptr > (void *) p->iscp) {
 815                         printk(KERN_ERR "%s: not enough shared-mem for your configuration!\n", dev->name);
 816                         return 1;
 817                 }
 818                 memset((char *) (p->xmit_cmds[i]), 0, sizeof(struct transmit_cmd_struct));
 819                 memset((char *) (p->xmit_buffs[i]), 0, sizeof(struct tbd_struct));
 820                 p->xmit_cmds[i]->cmd_status = STAT_COMPL;
 821                 p->xmit_cmds[i]->cmd_cmd = CMD_XMIT | CMD_INT;
 822                 p->xmit_cmds[i]->tbd_offset = make16((p->xmit_buffs[i]));
 823                 p->xmit_buffs[i]->next = 0xffff;
 824                 p->xmit_buffs[i]->buffer = make24((p->xmit_cbuffs[i]));
 825         }
 826
 827         p->xmit_count = 0;
 828         p->xmit_last = 0;
 829 #ifndef NO_NOPCOMMANDS
 830         p->nop_point = 0;
 831 #endif
 832
 833         /*
 834          * 'start transmitter' (nop-loop)
 835          */
 836 #ifndef NO_NOPCOMMANDS
 837         p->scb->cbl_offset = make16(p->nop_cmds[0]);
 838         p->scb->cmd = CUC_START;
 839         elmc_id_attn586();
 840         WAIT_4_SCB_CMD();
 841 #else
 842         p->xmit_cmds[0]->cmd_link = 0xffff;
 843         p->xmit_cmds[0]->cmd_cmd = CMD_XMIT | CMD_LAST | CMD_INT;
 844 #endif
 845
 846         return 0;
 847 }
 848
 849 /******************************************************
 850  * This is a helper routine for elmc_rnr_int() and init586().
 851  * It sets up the Receive Frame Area (RFA).
 852  */
 853
 854 static void *alloc_rfa(struct net_device *dev, void *ptr)
 855 {
 856         volatile struct rfd_struct *rfd = (struct rfd_struct *) ptr;
 857         volatile struct rbd_struct *rbd;
 858         int i;
 859         struct priv *p = netdev_priv(dev);
 860
 861         memset((char *) rfd, 0, sizeof(struct rfd_struct) * p->num_recv_buffs);
 862         p->rfd_first = rfd;
 863
 864         for (i = 0; i < p->num_recv_buffs; i++) {
 865                 rfd[i].next = make16(rfd + (i + 1) % p->num_recv_buffs);
 866         }
 867         rfd[p->num_recv_buffs - 1].last = RFD_SUSP;     /* RU suspend */
 868
 869         ptr = (void *) (rfd + p->num_recv_buffs);
 870
 871         rbd = (struct rbd_struct *) ptr;
 872         ptr = (void *) (rbd + p->num_recv_buffs);
 873
 874         /* clr descriptors */
 875         memset((char *) rbd, 0, sizeof(struct rbd_struct) * p->num_recv_buffs);
 876
 877         for (i = 0; i < p->num_recv_buffs; i++) {
 878                 rbd[i].next = make16((rbd + (i + 1) % p->num_recv_buffs));
 879                 rbd[i].size = RECV_BUFF_SIZE;
 880                 rbd[i].buffer = make24(ptr);
 881                 ptr = (char *) ptr + RECV_BUFF_SIZE;
 882         }
 883
 884         p->rfd_top = p->rfd_first;
 885         p->rfd_last = p->rfd_first + p->num_recv_buffs - 1;
 886
 887         p->scb->rfa_offset = make16(p->rfd_first);
 888         p->rfd_first->rbd_offset = make16(rbd);
 889
 890         return ptr;
 891 }
 892
 893
 894 /**************************************************
 895  * Interrupt Handler ...
 896  */
 897
 898 static irqreturn_t
 899 elmc_interrupt(int irq, void *dev_id)
 900 {
 901         struct net_device *dev = dev_id;
 902         unsigned short stat;
 903         struct priv *p;
 904
 905         if (!netif_running(dev)) {
 906                 /* The 3c523 has this habit of generating interrupts during the
 907                    reset.  I'm not sure if the ni52 has this same problem, but it's
 908                    really annoying if we haven't finished initializing it.  I was
 909                    hoping all the elmc_id_* commands would disable this, but I
 910                    might have missed a few. */
 911
 912                 elmc_id_attn586();      /* ack inter. and disable any more */
 913                 return IRQ_HANDLED;
 914         } else if (!(ELMC_CTRL_INT & inb(dev->base_addr + ELMC_CTRL))) {
 915                 /* wasn't this device */
 916                 return IRQ_NONE;
 917         }
 918         /* reading ELMC_CTRL also clears the INT bit. */
 919
 920         p = netdev_priv(dev);
 921
 922         while ((stat = p->scb->status & STAT_MASK))
 923         {
 924                 p->scb->cmd = stat;
 925                 elmc_attn586(); /* ack inter. */
 926
 927                 if (stat & STAT_CX) {
 928                         /* command with I-bit set complete */
 929                         elmc_xmt_int(dev);
 930                 }
 931                 if (stat & STAT_FR) {
 932                         /* received a frame */
 933                         elmc_rcv_int(dev);
 934                 }
 935 #ifndef NO_NOPCOMMANDS
 936                 if (stat & STAT_CNA) {
 937                         /* CU went 'not ready' */
 938                         if (netif_running(dev)) {
 939                                 printk(KERN_WARNING "%s: oops! CU has left active state. stat: %04x/%04x.\n", dev->name, (int) stat, (int) p->scb->status);
 940                         }
 941                 }
 942 #endif
 943
 944                 if (stat & STAT_RNR) {
 945                         /* RU went 'not ready' */
 946
 947                         if (p->scb->status & RU_SUSPEND) {
 948                                 /* special case: RU_SUSPEND */
 949
 950                                 WAIT_4_SCB_CMD();
 951                                 p->scb->cmd = RUC_RESUME;
 952                                 elmc_attn586();
 953                         } else {
 954                                 printk(KERN_WARNING "%s: Receiver-Unit went 'NOT READY': %04x/%04x.\n", dev->name, (int) stat, (int) p->scb->status);
 955                                 elmc_rnr_int(dev);
 956                         }
 957                 }
 958                 WAIT_4_SCB_CMD();       /* wait for ack. (elmc_xmt_int can be faster than ack!!) */
 959                 if (p->scb->cmd) {      /* timed out? */
 960                         break;
 961                 }
 962         }
 963         return IRQ_HANDLED;
 964 }
 965
 966 /*******************************************************
 967  * receive-interrupt
 968  */
 969
 970 static void elmc_rcv_int(struct net_device *dev)
 971 {
 972         int status;
 973         unsigned short totlen;
 974         struct sk_buff *skb;
 975         struct rbd_struct *rbd;
 976         struct priv *p = netdev_priv(dev);
 977
 978         for (; (status = p->rfd_top->status) & STAT_COMPL;) {
 979                 rbd = (struct rbd_struct *) make32(p->rfd_top->rbd_offset);
 980
 981                 if (status & STAT_OK) {         /* frame received without error? */
 982                         if ((totlen = rbd->status) & RBD_LAST) {        /* the first and the last buffer? */
 983                                 totlen &= RBD_MASK;     /* length of this frame */
 984                                 rbd->status = 0;
 985                                 skb = (struct sk_buff *) dev_alloc_skb(totlen + 2);
 986                                 if (skb != NULL) {
 987                                         skb_reserve(skb, 2);    /* 16 byte alignment */
 988                                         skb_put(skb,totlen);
 989                                         skb_copy_to_linear_data(skb, (char *) p->base+(unsigned long) rbd->buffer,totlen);
 990                                         skb->protocol = eth_type_trans(skb, dev);
 991                                         netif_rx(skb);
 992                                         dev->stats.rx_packets++;
 993                                         dev->stats.rx_bytes += totlen;
 994                                 } else {
 995                                         dev->stats.rx_dropped++;
 996                                 }
 997                         } else {
 998                                 printk(KERN_WARNING "%s: received oversized frame.\n", dev->name);
 999                                 dev->stats.rx_dropped++;
1000                         }
1001                 } else {        /* frame !(ok), only with 'save-bad-frames' */
1002                         printk(KERN_WARNING "%s: oops! rfd-error-status: %04x\n", dev->name, status);
1003                         dev->stats.rx_errors++;
1004                 }
1005                 p->rfd_top->status = 0;
1006                 p->rfd_top->last = RFD_SUSP;
1007                 p->rfd_last->last = 0;  /* delete RU_SUSP  */
1008                 p->rfd_last = p->rfd_top;
1009                 p->rfd_top = (struct rfd_struct *) make32(p->rfd_top->next);    /* step to next RFD */
1010         }
1011 }
1012
1013 /**********************************************************
1014  * handle 'Receiver went not ready'.
1015  */
1016
1017 static void elmc_rnr_int(struct net_device *dev)
1018 {
1019         struct priv *p = netdev_priv(dev);
1020
1021         dev->stats.rx_errors++;
1022
1023         WAIT_4_SCB_CMD();       /* wait for the last cmd */
1024         p->scb->cmd = RUC_ABORT;        /* usually the RU is in the 'no resource'-state .. abort it now. */
1025         elmc_attn586();
1026         WAIT_4_SCB_CMD();       /* wait for accept cmd. */
1027
1028         alloc_rfa(dev, (char *) p->rfd_first);
1029         startrecv586(dev);      /* restart RU */
1030
1031         printk(KERN_WARNING "%s: Receive-Unit restarted. Status: %04x\n", dev->name, p->scb->status);
1032
1033 }
1034
1035 /**********************************************************
1036  * handle xmit - interrupt
1037  */
1038
1039 static void elmc_xmt_int(struct net_device *dev)
1040 {
1041         int status;
1042         struct priv *p = netdev_priv(dev);
1043
1044         status = p->xmit_cmds[p->xmit_last]->cmd_status;
1045         if (!(status & STAT_COMPL)) {
1046                 printk(KERN_WARNING "%s: strange .. xmit-int without a 'COMPLETE'\n", dev->name);
1047         }
1048         if (status & STAT_OK) {
1049                 dev->stats.tx_packets++;
1050                 dev->stats.collisions += (status & TCMD_MAXCOLLMASK);
1051         } else {
1052                 dev->stats.tx_errors++;
1053                 if (status & TCMD_LATECOLL) {
1054                         printk(KERN_WARNING "%s: late collision detected.\n", dev->name);
1055                         dev->stats.collisions++;
1056                 } else if (status & TCMD_NOCARRIER) {
1057                         dev->stats.tx_carrier_errors++;
1058                         printk(KERN_WARNING "%s: no carrier detected.\n", dev->name);
1059                 } else if (status & TCMD_LOSTCTS) {
1060                         printk(KERN_WARNING "%s: loss of CTS detected.\n", dev->name);
1061                 } else if (status & TCMD_UNDERRUN) {
1062                         dev->stats.tx_fifo_errors++;
1063                         printk(KERN_WARNING "%s: DMA underrun detected.\n", dev->name);
1064                 } else if (status & TCMD_MAXCOLL) {
1065                         printk(KERN_WARNING "%s: Max. collisions exceeded.\n", dev->name);
1066                         dev->stats.collisions += 16;
1067                 }
1068         }
1069
1070 #if (NUM_XMIT_BUFFS != 1)
1071         if ((++p->xmit_last) == NUM_XMIT_BUFFS) {
1072                 p->xmit_last = 0;
1073         }
1074 #endif
1075
1076         netif_wake_queue(dev);
1077 }
1078
1079 /***********************************************************
1080  * (re)start the receiver
1081  */
1082
1083 static void startrecv586(struct net_device *dev)
1084 {
1085         struct priv *p = netdev_priv(dev);
1086
1087         p->scb->rfa_offset = make16(p->rfd_first);
1088         p->scb->cmd = RUC_START;
1089         elmc_attn586();         /* start cmd. */
1090         WAIT_4_SCB_CMD();       /* wait for accept cmd. (no timeout!!) */
1091 }
1092
1093 /******************************************************
1094  * timeout
1095  */
1096
1097 static void elmc_timeout(struct net_device *dev)
1098 {
1099         struct priv *p = netdev_priv(dev);
1100         /* COMMAND-UNIT active? */
1101         if (p->scb->status & CU_ACTIVE) {
1102 #ifdef DEBUG
1103                 printk("%s: strange ... timeout with CU active?!?\n", dev->name);
1104                 printk("%s: X0: %04x N0: %04x N1: %04x %d\n", dev->name, (int) p->xmit_cmds[0]->cmd_status, (int) p->nop_cmds[0]->cmd_status, (int) p->nop_cmds[1]->cmd_status, (int) p->nop_point);
1105 #endif
1106                 p->scb->cmd = CUC_ABORT;
1107                 elmc_attn586();
1108                 WAIT_4_SCB_CMD();
1109                 p->scb->cbl_offset = make16(p->nop_cmds[p->nop_point]);
1110                 p->scb->cmd = CUC_START;
1111                 elmc_attn586();
1112                 WAIT_4_SCB_CMD();
1113                 netif_wake_queue(dev);
1114         } else {
1115 #ifdef DEBUG
1116                 printk("%s: xmitter timed out, try to restart! stat: %04x\n", dev->name, p->scb->status);
1117                 printk("%s: command-stats: %04x %04x\n", dev->name, p->xmit_cmds[0]->cmd_status, p->xmit_cmds[1]->cmd_status);
1118 #endif
1119                 elmc_close(dev);
1120                 elmc_open(dev);
1121         }
1122 }
1123
1124 /******************************************************
1125  * send frame
1126  */
1127
1128 static int elmc_send_packet(struct sk_buff *skb, struct net_device *dev)
1129 {
1130         int len;
1131         int i;
1132 #ifndef NO_NOPCOMMANDS
1133         int next_nop;
1134 #endif
1135         struct priv *p = netdev_priv(dev);
1136
1137         netif_stop_queue(dev);
1138
1139         len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
1140
1141         if (len != skb->len)
1142                 memset((char *) p->xmit_cbuffs[p->xmit_count], 0, ETH_ZLEN);
1143         skb_copy_from_linear_data(skb, (char *) p->xmit_cbuffs[p->xmit_count], skb->len);
1144
1145 #if (NUM_XMIT_BUFFS == 1)
1146 #ifdef NO_NOPCOMMANDS
1147         p->xmit_buffs[0]->size = TBD_LAST | len;
1148         for (i = 0; i < 16; i++) {
1149                 p->scb->cbl_offset = make16(p->xmit_cmds[0]);
1150                 p->scb->cmd = CUC_START;
1151                 p->xmit_cmds[0]->cmd_status = 0;
1152                         elmc_attn586();
1153                 dev->trans_start = jiffies;
1154                 if (!i) {
1155                         dev_kfree_skb(skb);
1156                 }
1157                 WAIT_4_SCB_CMD();
1158                 if ((p->scb->status & CU_ACTIVE)) {     /* test it, because CU sometimes doesn't start immediately */
1159                         break;
1160                 }
1161                 if (p->xmit_cmds[0]->cmd_status) {
1162                         break;
1163                 }
1164                 if (i == 15) {
1165                         printk(KERN_WARNING "%s: Can't start transmit-command.\n", dev->name);
1166                 }
1167         }
1168 #else
1169         next_nop = (p->nop_point + 1) & 0x1;
1170         p->xmit_buffs[0]->size = TBD_LAST | len;
1171
1172         p->xmit_cmds[0]->cmd_link = p->nop_cmds[next_nop]->cmd_link
1173             = make16((p->nop_cmds[next_nop]));
1174         p->xmit_cmds[0]->cmd_status = p->nop_cmds[next_nop]->cmd_status = 0;
1175
1176         p->nop_cmds[p->nop_point]->cmd_link = make16((p->xmit_cmds[0]));
1177         dev->trans_start = jiffies;
1178         p->nop_point = next_nop;
1179         dev_kfree_skb(skb);
1180 #endif
1181 #else
1182         p->xmit_buffs[p->xmit_count]->size = TBD_LAST | len;
1183         if ((next_nop = p->xmit_count + 1) == NUM_XMIT_BUFFS) {
1184                 next_nop = 0;
1185         }
1186         p->xmit_cmds[p->xmit_count]->cmd_status = 0;
1187         p->xmit_cmds[p->xmit_count]->cmd_link = p->nop_cmds[next_nop]->cmd_link
1188             = make16((p->nop_cmds[next_nop]));
1189         p->nop_cmds[next_nop]->cmd_status = 0;
1190                 p->nop_cmds[p->xmit_count]->cmd_link = make16((p->xmit_cmds[p->xmit_count]));
1191         dev->trans_start = jiffies;
1192         p->xmit_count = next_nop;
1193         if (p->xmit_count != p->xmit_last)
1194                 netif_wake_queue(dev);
1195         dev_kfree_skb(skb);
1196 #endif
1197         return 0;
1198 }
1199
1200 /*******************************************
1201  * Someone wanna have the statistics
1202  */
1203
1204 static struct net_device_stats *elmc_get_stats(struct net_device *dev)
1205 {
1206         struct priv *p = netdev_priv(dev);
1207         unsigned short crc, aln, rsc, ovrn;
1208
1209         crc = p->scb->crc_errs; /* get error-statistic from the ni82586 */
1210         p->scb->crc_errs -= crc;
1211         aln = p->scb->aln_errs;
1212         p->scb->aln_errs -= aln;
1213         rsc = p->scb->rsc_errs;
1214         p->scb->rsc_errs -= rsc;
1215         ovrn = p->scb->ovrn_errs;
1216         p->scb->ovrn_errs -= ovrn;
1217
1218         dev->stats.rx_crc_errors += crc;
1219         dev->stats.rx_fifo_errors += ovrn;
1220         dev->stats.rx_frame_errors += aln;
1221         dev->stats.rx_dropped += rsc;
1222
1223         return &dev->stats;
1224 }
1225
1226 /********************************************************
1227  * Set MC list ..
1228  */
1229
1230 #ifdef ELMC_MULTICAST
1231 static void set_multicast_list(struct net_device *dev)
1232 {
1233         if (!dev->start) {
1234                 /* without a running interface, promiscuous doesn't work */
1235                 return;
1236         }
1237         dev->start = 0;
1238         alloc586(dev);
1239         init586(dev);
1240         startrecv586(dev);
1241         dev->start = 1;
1242 }
1243 #endif
1244
1245 static void netdev_get_drvinfo(struct net_device *dev,
1246                                struct ethtool_drvinfo *info)
1247 {
1248         strcpy(info->driver, DRV_NAME);
1249         strcpy(info->version, DRV_VERSION);
1250         sprintf(info->bus_info, "MCA 0x%lx", dev->base_addr);
1251 }
1252
1253 static const struct ethtool_ops netdev_ethtool_ops = {
1254         .get_drvinfo            = netdev_get_drvinfo,
1255 };
1256
1257 #ifdef MODULE
1258
1259 /* Increase if needed ;) */
1260 #define MAX_3C523_CARDS 4
1261
1262 static struct net_device *dev_elmc[MAX_3C523_CARDS];
1263 static int irq[MAX_3C523_CARDS];
1264 static int io[MAX_3C523_CARDS];
1265 module_param_array(irq, int, NULL, 0);
1266 module_param_array(io, int, NULL, 0);
1267 MODULE_PARM_DESC(io, "EtherLink/MC I/O base address(es)");
1268 MODULE_PARM_DESC(irq, "EtherLink/MC IRQ number(s)");
1269 MODULE_LICENSE("GPL");
1270
1271 int __init init_module(void)
1272 {
1273         int this_dev,found = 0;
1274
1275         /* Loop until we either can't find any more cards, or we have MAX_3C523_CARDS */
1276         for(this_dev=0; this_dev<MAX_3C523_CARDS; this_dev++) {
1277                 struct net_device *dev = alloc_etherdev(sizeof(struct priv));
1278                 if (!dev)
1279                         break;
1280                 dev->irq=irq[this_dev];
1281                 dev->base_addr=io[this_dev];
1282                 if (do_elmc_probe(dev) == 0) {
1283                         dev_elmc[this_dev] = dev;
1284                         found++;
1285                         continue;
1286                 }
1287                 free_netdev(dev);
1288                 if (io[this_dev]==0)
1289                         break;
1290                 printk(KERN_WARNING "3c523.c: No 3c523 card found at io=%#x\n",io[this_dev]);
1291         }
1292
1293         if(found==0) {
1294                 if(io[0]==0) printk(KERN_NOTICE "3c523.c: No 3c523 cards found\n");
1295                 return -ENXIO;
1296         } else return 0;
1297 }
1298
1299 void __exit cleanup_module(void)
1300 {
1301         int this_dev;
1302         for (this_dev=0; this_dev<MAX_3C523_CARDS; this_dev++) {
1303                 struct net_device *dev = dev_elmc[this_dev];
1304                 if (dev) {
1305                         unregister_netdev(dev);
1306                         cleanup_card(dev);
1307                         free_netdev(dev);
1308                 }
1309         }
1310 }
1311
1312 #endif                          /* MODULE */