linux/drivers/net/appletalk/cops.c
<<
>>
Prefs
   1/*      cops.c: LocalTalk driver for Linux.
   2 *
   3 *      Authors:
   4 *      - Jay Schulist <jschlst@samba.org>
   5 *
   6 *      With more than a little help from;
   7 *      - Alan Cox <alan@lxorguk.ukuu.org.uk>
   8 *
   9 *      Derived from:
  10 *      - skeleton.c: A network driver outline for linux.
  11 *        Written 1993-94 by Donald Becker.
  12 *      - ltpc.c: A driver for the LocalTalk PC card.
  13 *        Written by Bradford W. Johnson.
  14 *
  15 *      Copyright 1993 United States Government as represented by the
  16 *      Director, National Security Agency.
  17 *
  18 *      This software may be used and distributed according to the terms
  19 *      of the GNU General Public License, incorporated herein by reference.
  20 *
  21 *      Changes:
  22 *      19970608        Alan Cox        Allowed dual card type support
  23 *                                      Can set board type in insmod
  24 *                                      Hooks for cops_setup routine
  25 *                                      (not yet implemented).
  26 *      19971101        Jay Schulist    Fixes for multiple lt* devices.
  27 *      19980607        Steven Hirsch   Fixed the badly broken support
  28 *                                      for Tangent type cards. Only
  29 *                                      tested on Daystar LT200. Some
  30 *                                      cleanup of formatting and program
  31 *                                      logic.  Added emacs 'local-vars'
  32 *                                      setup for Jay's brace style.
  33 *      20000211        Alan Cox        Cleaned up for softnet
  34 */
  35
  36static const char *version =
  37"cops.c:v0.04 6/7/98 Jay Schulist <jschlst@samba.org>\n";
  38/*
  39 *  Sources:
  40 *      COPS Localtalk SDK. This provides almost all of the information
  41 *      needed.
  42 */
  43
  44/*
  45 * insmod/modprobe configurable stuff.
  46 *      - IO Port, choose one your card supports or 0 if you dare.
  47 *      - IRQ, also choose one your card supports or nothing and let
  48 *        the driver figure it out.
  49 */
  50
  51#include <linux/module.h>
  52#include <linux/kernel.h>
  53#include <linux/types.h>
  54#include <linux/fcntl.h>
  55#include <linux/interrupt.h>
  56#include <linux/ptrace.h>
  57#include <linux/ioport.h>
  58#include <linux/in.h>
  59#include <linux/string.h>
  60#include <linux/errno.h>
  61#include <linux/init.h>
  62#include <linux/netdevice.h>
  63#include <linux/etherdevice.h>
  64#include <linux/skbuff.h>
  65#include <linux/if_arp.h>
  66#include <linux/if_ltalk.h>
  67#include <linux/delay.h>        /* For udelay() */
  68#include <linux/atalk.h>
  69#include <linux/spinlock.h>
  70#include <linux/bitops.h>
  71#include <linux/jiffies.h>
  72
  73#include <net/Space.h>
  74
  75#include <asm/io.h>
  76#include <asm/dma.h>
  77
  78#include "cops.h"               /* Our Stuff */
  79#include "cops_ltdrv.h"         /* Firmware code for Tangent type cards. */
  80#include "cops_ffdrv.h"         /* Firmware code for Dayna type cards. */
  81
  82/*
  83 *      The name of the card. Is used for messages and in the requests for
  84 *      io regions, irqs and dma channels
  85 */
  86
  87static const char *cardname = "cops";
  88
  89#ifdef CONFIG_COPS_DAYNA
  90static int board_type = DAYNA;  /* Module exported */
  91#else
  92static int board_type = TANGENT;
  93#endif
  94
  95static int io = 0x240;          /* Default IO for Dayna */
  96static int irq = 5;             /* Default IRQ */
  97
  98/*
  99 *      COPS Autoprobe information.
 100 *      Right now if port address is right but IRQ is not 5 this will
 101 *      return a 5 no matter what since we will still get a status response.
 102 *      Need one more additional check to narrow down after we have gotten
 103 *      the ioaddr. But since only other possible IRQs is 3 and 4 so no real
 104 *      hurry on this. I *STRONGLY* recommend using IRQ 5 for your card with
 105 *      this driver.
 106 * 
 107 *      This driver has 2 modes and they are: Dayna mode and Tangent mode.
 108 *      Each mode corresponds with the type of card. It has been found
 109 *      that there are 2 main types of cards and all other cards are
 110 *      the same and just have different names or only have minor differences
 111 *      such as more IO ports. As this driver is tested it will
 112 *      become more clear on exactly what cards are supported. The driver
 113 *      defaults to using Dayna mode. To change the drivers mode, simply
 114 *      select Dayna or Tangent mode when configuring the kernel.
 115 *
 116 *      This driver should support:
 117 *      TANGENT driver mode:
 118 *              Tangent ATB-II, Novell NL-1000, Daystar Digital LT-200,
 119 *              COPS LT-1
 120 *      DAYNA driver mode:
 121 *              Dayna DL2000/DaynaTalk PC (Half Length), COPS LT-95, 
 122 *              Farallon PhoneNET PC III, Farallon PhoneNET PC II
 123 *      Other cards possibly supported mode unknown though:
 124 *              Dayna DL2000 (Full length), COPS LT/M (Micro-Channel)
 125 *
 126 *      Cards NOT supported by this driver but supported by the ltpc.c
 127 *      driver written by Bradford W. Johnson <johns393@maroon.tc.umn.edu>
 128 *              Farallon PhoneNET PC
 129 *              Original Apple LocalTalk PC card
 130 * 
 131 *      N.B.
 132 *
 133 *      The Daystar Digital LT200 boards do not support interrupt-driven
 134 *      IO.  You must specify 'irq=0xff' as a module parameter to invoke
 135 *      polled mode.  I also believe that the port probing logic is quite
 136 *      dangerous at best and certainly hopeless for a polled card.  Best to 
 137 *      specify both. - Steve H.
 138 *
 139 */
 140
 141/*
 142 * Zero terminated list of IO ports to probe.
 143 */
 144
 145static unsigned int ports[] = { 
 146        0x240, 0x340, 0x200, 0x210, 0x220, 0x230, 0x260, 
 147        0x2A0, 0x300, 0x310, 0x320, 0x330, 0x350, 0x360,
 148        0
 149};
 150
 151/*
 152 * Zero terminated list of IRQ ports to probe.
 153 */
 154
 155static int cops_irqlist[] = {
 156        5, 4, 3, 0 
 157};
 158
 159static struct timer_list cops_timer;
 160static struct net_device *cops_timer_dev;
 161
 162/* use 0 for production, 1 for verification, 2 for debug, 3 for verbose debug */
 163#ifndef COPS_DEBUG
 164#define COPS_DEBUG 1 
 165#endif
 166static unsigned int cops_debug = COPS_DEBUG;
 167
 168/* The number of low I/O ports used by the card. */
 169#define COPS_IO_EXTENT       8
 170
 171/* Information that needs to be kept for each board. */
 172
 173struct cops_local
 174{
 175        int board;                      /* Holds what board type is. */
 176        int nodeid;                     /* Set to 1 once have nodeid. */
 177        unsigned char node_acquire;     /* Node ID when acquired. */
 178        struct atalk_addr node_addr;    /* Full node address */
 179        spinlock_t lock;                /* RX/TX lock */
 180};
 181
 182/* Index to functions, as function prototypes. */
 183static int  cops_probe1 (struct net_device *dev, int ioaddr);
 184static int  cops_irq (int ioaddr, int board);
 185
 186static int  cops_open (struct net_device *dev);
 187static int  cops_jumpstart (struct net_device *dev);
 188static void cops_reset (struct net_device *dev, int sleep);
 189static void cops_load (struct net_device *dev);
 190static int  cops_nodeid (struct net_device *dev, int nodeid);
 191
 192static irqreturn_t cops_interrupt (int irq, void *dev_id);
 193static void cops_poll(struct timer_list *t);
 194static void cops_timeout(struct net_device *dev, unsigned int txqueue);
 195static void cops_rx (struct net_device *dev);
 196static netdev_tx_t  cops_send_packet (struct sk_buff *skb,
 197                                            struct net_device *dev);
 198static void set_multicast_list (struct net_device *dev);
 199static int  cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
 200static int  cops_close (struct net_device *dev);
 201
 202static void cleanup_card(struct net_device *dev)
 203{
 204        if (dev->irq)
 205                free_irq(dev->irq, dev);
 206        release_region(dev->base_addr, COPS_IO_EXTENT);
 207}
 208
 209/*
 210 *      Check for a network adaptor of this type, and return '0' iff one exists.
 211 *      If dev->base_addr == 0, probe all likely locations.
 212 *      If dev->base_addr in [1..0x1ff], always return failure.
 213 *        otherwise go with what we pass in.
 214 */
 215struct net_device * __init cops_probe(int unit)
 216{
 217        struct net_device *dev;
 218        unsigned *port;
 219        int base_addr;
 220        int err = 0;
 221
 222        dev = alloc_ltalkdev(sizeof(struct cops_local));
 223        if (!dev)
 224                return ERR_PTR(-ENOMEM);
 225
 226        if (unit >= 0) {
 227                sprintf(dev->name, "lt%d", unit);
 228                netdev_boot_setup_check(dev);
 229                irq = dev->irq;
 230                base_addr = dev->base_addr;
 231        } else {
 232                base_addr = dev->base_addr = io;
 233        }
 234
 235        if (base_addr > 0x1ff) {    /* Check a single specified location. */
 236                err = cops_probe1(dev, base_addr);
 237        } else if (base_addr != 0) { /* Don't probe at all. */
 238                err = -ENXIO;
 239        } else {
 240                /* FIXME  Does this really work for cards which generate irq?
 241                 * It's definitely N.G. for polled Tangent. sh
 242                 * Dayna cards don't autoprobe well at all, but if your card is
 243                 * at IRQ 5 & IO 0x240 we find it every time. ;) JS
 244                 */
 245                for (port = ports; *port && cops_probe1(dev, *port) < 0; port++)
 246                        ;
 247                if (!*port)
 248                        err = -ENODEV;
 249        }
 250        if (err)
 251                goto out;
 252        err = register_netdev(dev);
 253        if (err)
 254                goto out1;
 255        return dev;
 256out1:
 257        cleanup_card(dev);
 258out:
 259        free_netdev(dev);
 260        return ERR_PTR(err);
 261}
 262
 263static const struct net_device_ops cops_netdev_ops = {
 264        .ndo_open               = cops_open,
 265        .ndo_stop               = cops_close,
 266        .ndo_start_xmit         = cops_send_packet,
 267        .ndo_tx_timeout         = cops_timeout,
 268        .ndo_do_ioctl           = cops_ioctl,
 269        .ndo_set_rx_mode        = set_multicast_list,
 270};
 271
 272/*
 273 *      This is the real probe routine. Linux has a history of friendly device
 274 *      probes on the ISA bus. A good device probes avoids doing writes, and
 275 *      verifies that the correct device exists and functions.
 276 */
 277static int __init cops_probe1(struct net_device *dev, int ioaddr)
 278{
 279        struct cops_local *lp;
 280        static unsigned version_printed;
 281        int board = board_type;
 282        int retval;
 283        
 284        if(cops_debug && version_printed++ == 0)
 285                printk("%s", version);
 286
 287        /* Grab the region so no one else tries to probe our ioports. */
 288        if (!request_region(ioaddr, COPS_IO_EXTENT, dev->name))
 289                return -EBUSY;
 290
 291        /*
 292         * Since this board has jumpered interrupts, allocate the interrupt
 293         * vector now. There is no point in waiting since no other device
 294         * can use the interrupt, and this marks the irq as busy. Jumpered
 295         * interrupts are typically not reported by the boards, and we must
 296         * used AutoIRQ to find them.
 297         */
 298        dev->irq = irq;
 299        switch (dev->irq)
 300        {
 301                case 0:
 302                        /* COPS AutoIRQ routine */
 303                        dev->irq = cops_irq(ioaddr, board);
 304                        if (dev->irq)
 305                                break;
 306                        fallthrough;    /* Once no IRQ found on this port */
 307                case 1:
 308                        retval = -EINVAL;
 309                        goto err_out;
 310
 311                /* Fixup for users that don't know that IRQ 2 is really
 312                 * IRQ 9, or don't know which one to set.
 313                 */
 314                case 2:
 315                        dev->irq = 9;
 316                        break;
 317
 318                /* Polled operation requested. Although irq of zero passed as
 319                 * a parameter tells the init routines to probe, we'll
 320                 * overload it to denote polled operation at runtime.
 321                 */
 322                case 0xff:
 323                        dev->irq = 0;
 324                        break;
 325
 326                default:
 327                        break;
 328        }
 329
 330        /* Reserve any actual interrupt. */
 331        if (dev->irq) {
 332                retval = request_irq(dev->irq, cops_interrupt, 0, dev->name, dev);
 333                if (retval)
 334                        goto err_out;
 335        }
 336
 337        dev->base_addr = ioaddr;
 338
 339        lp = netdev_priv(dev);
 340        spin_lock_init(&lp->lock);
 341
 342        /* Copy local board variable to lp struct. */
 343        lp->board               = board;
 344
 345        dev->netdev_ops         = &cops_netdev_ops;
 346        dev->watchdog_timeo     = HZ * 2;
 347
 348
 349        /* Tell the user where the card is and what mode we're in. */
 350        if(board==DAYNA)
 351                printk("%s: %s at %#3x, using IRQ %d, in Dayna mode.\n", 
 352                        dev->name, cardname, ioaddr, dev->irq);
 353        if(board==TANGENT) {
 354                if(dev->irq)
 355                        printk("%s: %s at %#3x, IRQ %d, in Tangent mode\n", 
 356                                dev->name, cardname, ioaddr, dev->irq);
 357                else
 358                        printk("%s: %s at %#3x, using polled IO, in Tangent mode.\n", 
 359                                dev->name, cardname, ioaddr);
 360
 361        }
 362        return 0;
 363
 364err_out:
 365        release_region(ioaddr, COPS_IO_EXTENT);
 366        return retval;
 367}
 368
 369static int __init cops_irq (int ioaddr, int board)
 370{       /*
 371         * This does not use the IRQ to determine where the IRQ is. We just
 372         * assume that when we get a correct status response that it's the IRQ.
 373         * This really just verifies the IO port but since we only have access
 374         * to such a small number of IRQs (5, 4, 3) this is not bad.
 375         * This will probably not work for more than one card.
 376         */
 377        int irqaddr=0;
 378        int i, x, status;
 379
 380        if(board==DAYNA)
 381        {
 382                outb(0, ioaddr+DAYNA_RESET);
 383                inb(ioaddr+DAYNA_RESET);
 384                mdelay(333);
 385        }
 386        if(board==TANGENT)
 387        {
 388                inb(ioaddr);
 389                outb(0, ioaddr);
 390                outb(0, ioaddr+TANG_RESET);
 391        }
 392
 393        for(i=0; cops_irqlist[i] !=0; i++)
 394        {
 395                irqaddr = cops_irqlist[i];
 396                for(x = 0xFFFF; x>0; x --)    /* wait for response */
 397                {
 398                        if(board==DAYNA)
 399                        {
 400                                status = (inb(ioaddr+DAYNA_CARD_STATUS)&3);
 401                                if(status == 1)
 402                                        return irqaddr;
 403                        }
 404                        if(board==TANGENT)
 405                        {
 406                                if((inb(ioaddr+TANG_CARD_STATUS)& TANG_TX_READY) !=0)
 407                                        return irqaddr;
 408                        }
 409                }
 410        }
 411        return 0;       /* no IRQ found */
 412}
 413
 414/*
 415 * Open/initialize the board. This is called (in the current kernel)
 416 * sometime after booting when the 'ifconfig' program is run.
 417 */
 418static int cops_open(struct net_device *dev)
 419{
 420    struct cops_local *lp = netdev_priv(dev);
 421
 422        if(dev->irq==0)
 423        {
 424                /*
 425                 * I don't know if the Dayna-style boards support polled 
 426                 * operation.  For now, only allow it for Tangent.
 427                 */
 428                if(lp->board==TANGENT)  /* Poll 20 times per second */
 429                {
 430                    cops_timer_dev = dev;
 431                    timer_setup(&cops_timer, cops_poll, 0);
 432                    cops_timer.expires  = jiffies + HZ/20;
 433                    add_timer(&cops_timer);
 434                } 
 435                else 
 436                {
 437                        printk(KERN_WARNING "%s: No irq line set\n", dev->name);
 438                        return -EAGAIN;
 439                }
 440        }
 441
 442        cops_jumpstart(dev);    /* Start the card up. */
 443
 444        netif_start_queue(dev);
 445        return 0;
 446}
 447
 448/*
 449 *      This allows for a dynamic start/restart of the entire card.
 450 */
 451static int cops_jumpstart(struct net_device *dev)
 452{
 453        struct cops_local *lp = netdev_priv(dev);
 454
 455        /*
 456         *      Once the card has the firmware loaded and has acquired
 457         *      the nodeid, if it is reset it will lose it all.
 458         */
 459        cops_reset(dev,1);      /* Need to reset card before load firmware. */
 460        cops_load(dev);         /* Load the firmware. */
 461
 462        /*
 463         *      If atalkd already gave us a nodeid we will use that
 464         *      one again, else we wait for atalkd to give us a nodeid
 465         *      in cops_ioctl. This may cause a problem if someone steals
 466         *      our nodeid while we are resetting.
 467         */     
 468        if(lp->nodeid == 1)
 469                cops_nodeid(dev,lp->node_acquire);
 470
 471        return 0;
 472}
 473
 474static void tangent_wait_reset(int ioaddr)
 475{
 476        int timeout=0;
 477
 478        while(timeout++ < 5 && (inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
 479                mdelay(1);   /* Wait 1 second */
 480}
 481
 482/*
 483 *      Reset the LocalTalk board.
 484 */
 485static void cops_reset(struct net_device *dev, int sleep)
 486{
 487        struct cops_local *lp = netdev_priv(dev);
 488        int ioaddr=dev->base_addr;
 489
 490        if(lp->board==TANGENT)
 491        {
 492                inb(ioaddr);            /* Clear request latch. */
 493                outb(0,ioaddr);         /* Clear the TANG_TX_READY flop. */
 494                outb(0, ioaddr+TANG_RESET);     /* Reset the adapter. */
 495
 496                tangent_wait_reset(ioaddr);
 497                outb(0, ioaddr+TANG_CLEAR_INT);
 498        }
 499        if(lp->board==DAYNA)
 500        {
 501                outb(0, ioaddr+DAYNA_RESET);    /* Assert the reset port */
 502                inb(ioaddr+DAYNA_RESET);        /* Clear the reset */
 503                if (sleep)
 504                        msleep(333);
 505                else
 506                        mdelay(333);
 507        }
 508
 509        netif_wake_queue(dev);
 510}
 511
 512static void cops_load (struct net_device *dev)
 513{
 514        struct ifreq ifr;
 515        struct ltfirmware *ltf= (struct ltfirmware *)&ifr.ifr_ifru;
 516        struct cops_local *lp = netdev_priv(dev);
 517        int ioaddr=dev->base_addr;
 518        int length, i = 0;
 519
 520        strcpy(ifr.ifr_name,"lt0");
 521
 522        /* Get card's firmware code and do some checks on it. */
 523#ifdef CONFIG_COPS_DAYNA        
 524        if(lp->board==DAYNA)
 525        {
 526                ltf->length=sizeof(ffdrv_code);
 527                ltf->data=ffdrv_code;
 528        }
 529        else
 530#endif        
 531#ifdef CONFIG_COPS_TANGENT
 532        if(lp->board==TANGENT)
 533        {
 534                ltf->length=sizeof(ltdrv_code);
 535                ltf->data=ltdrv_code;
 536        }
 537        else
 538#endif
 539        {
 540                printk(KERN_INFO "%s; unsupported board type.\n", dev->name);
 541                return;
 542        }
 543        
 544        /* Check to make sure firmware is correct length. */
 545        if(lp->board==DAYNA && ltf->length!=5983)
 546        {
 547                printk(KERN_WARNING "%s: Firmware is not length of FFDRV.BIN.\n", dev->name);
 548                return;
 549        }
 550        if(lp->board==TANGENT && ltf->length!=2501)
 551        {
 552                printk(KERN_WARNING "%s: Firmware is not length of DRVCODE.BIN.\n", dev->name);
 553                return;
 554        }
 555
 556        if(lp->board==DAYNA)
 557        {
 558                /*
 559                 *      We must wait for a status response
 560                 *      with the DAYNA board.
 561                 */
 562                while(++i<65536)
 563                {
 564                       if((inb(ioaddr+DAYNA_CARD_STATUS)&3)==1)
 565                                break;
 566                }
 567
 568                if(i==65536)
 569                        return;
 570        }
 571
 572        /*
 573         *      Upload the firmware and kick. Byte-by-byte works nicely here.
 574         */
 575        i=0;
 576        length = ltf->length;
 577        while(length--)
 578        {
 579                outb(ltf->data[i], ioaddr);
 580                i++;
 581        }
 582
 583        if(cops_debug > 1)
 584                printk("%s: Uploaded firmware - %d bytes of %d bytes.\n", 
 585                        dev->name, i, ltf->length);
 586
 587        if(lp->board==DAYNA)    /* Tell Dayna to run the firmware code. */
 588                outb(1, ioaddr+DAYNA_INT_CARD);
 589        else                    /* Tell Tang to run the firmware code. */
 590                inb(ioaddr);
 591
 592        if(lp->board==TANGENT)
 593        {
 594                tangent_wait_reset(ioaddr);
 595                inb(ioaddr);    /* Clear initial ready signal. */
 596        }
 597}
 598
 599/*
 600 *      Get the LocalTalk Nodeid from the card. We can suggest
 601 *      any nodeid 1-254. The card will try and get that exact
 602 *      address else we can specify 0 as the nodeid and the card
 603 *      will autoprobe for a nodeid.
 604 */
 605static int cops_nodeid (struct net_device *dev, int nodeid)
 606{
 607        struct cops_local *lp = netdev_priv(dev);
 608        int ioaddr = dev->base_addr;
 609
 610        if(lp->board == DAYNA)
 611        {
 612                /* Empty any pending adapter responses. */
 613                while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
 614                {
 615                        outb(0, ioaddr+COPS_CLEAR_INT); /* Clear interrupts. */
 616                        if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
 617                                cops_rx(dev);   /* Kick any packets waiting. */
 618                        schedule();
 619                }
 620
 621                outb(2, ioaddr);        /* Output command packet length as 2. */
 622                outb(0, ioaddr);
 623                outb(LAP_INIT, ioaddr); /* Send LAP_INIT command byte. */
 624                outb(nodeid, ioaddr);   /* Suggest node address. */
 625        }
 626
 627        if(lp->board == TANGENT)
 628        {
 629                /* Empty any pending adapter responses. */
 630                while(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
 631                {
 632                        outb(0, ioaddr+COPS_CLEAR_INT); /* Clear interrupt. */
 633                        cops_rx(dev);           /* Kick out packets waiting. */
 634                        schedule();
 635                }
 636
 637                /* Not sure what Tangent does if nodeid picked is used. */
 638                if(nodeid == 0)                         /* Seed. */
 639                        nodeid = jiffies&0xFF;          /* Get a random try */
 640                outb(2, ioaddr);                        /* Command length LSB */
 641                outb(0, ioaddr);                        /* Command length MSB */
 642                outb(LAP_INIT, ioaddr);                 /* Send LAP_INIT byte */
 643                outb(nodeid, ioaddr);                   /* LAP address hint. */
 644                outb(0xFF, ioaddr);                     /* Int. level to use */
 645        }
 646
 647        lp->node_acquire=0;             /* Set nodeid holder to 0. */
 648        while(lp->node_acquire==0)      /* Get *True* nodeid finally. */
 649        {
 650                outb(0, ioaddr+COPS_CLEAR_INT); /* Clear any interrupt. */
 651
 652                if(lp->board == DAYNA)
 653                {
 654                        if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
 655                                cops_rx(dev);   /* Grab the nodeid put in lp->node_acquire. */
 656                }
 657                if(lp->board == TANGENT)
 658                {       
 659                        if(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
 660                                cops_rx(dev);   /* Grab the nodeid put in lp->node_acquire. */
 661                }
 662                schedule();
 663        }
 664
 665        if(cops_debug > 1)
 666                printk(KERN_DEBUG "%s: Node ID %d has been acquired.\n", 
 667                        dev->name, lp->node_acquire);
 668
 669        lp->nodeid=1;   /* Set got nodeid to 1. */
 670
 671        return 0;
 672}
 673
 674/*
 675 *      Poll the Tangent type cards to see if we have work.
 676 */
 677 
 678static void cops_poll(struct timer_list *unused)
 679{
 680        int ioaddr, status;
 681        int boguscount = 0;
 682        struct net_device *dev = cops_timer_dev;
 683
 684        del_timer(&cops_timer);
 685
 686        if(dev == NULL)
 687                return; /* We've been downed */
 688
 689        ioaddr = dev->base_addr;
 690        do {
 691                status=inb(ioaddr+TANG_CARD_STATUS);
 692                if(status & TANG_RX_READY)
 693                        cops_rx(dev);
 694                if(status & TANG_TX_READY)
 695                        netif_wake_queue(dev);
 696                status = inb(ioaddr+TANG_CARD_STATUS);
 697        } while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
 698
 699        /* poll 20 times per second */
 700        cops_timer.expires = jiffies + HZ/20;
 701        add_timer(&cops_timer);
 702}
 703
 704/*
 705 *      The typical workload of the driver:
 706 *      Handle the network interface interrupts.
 707 */
 708static irqreturn_t cops_interrupt(int irq, void *dev_id)
 709{
 710        struct net_device *dev = dev_id;
 711        struct cops_local *lp;
 712        int ioaddr, status;
 713        int boguscount = 0;
 714
 715        ioaddr = dev->base_addr;
 716        lp = netdev_priv(dev);
 717
 718        if(lp->board==DAYNA)
 719        {
 720                do {
 721                        outb(0, ioaddr + COPS_CLEAR_INT);
 722                        status=inb(ioaddr+DAYNA_CARD_STATUS);
 723                        if((status&0x03)==DAYNA_RX_REQUEST)
 724                                cops_rx(dev);
 725                        netif_wake_queue(dev);
 726                } while(++boguscount < 20);
 727        }
 728        else
 729        {
 730                do {
 731                        status=inb(ioaddr+TANG_CARD_STATUS);
 732                        if(status & TANG_RX_READY)
 733                                cops_rx(dev);
 734                        if(status & TANG_TX_READY)
 735                                netif_wake_queue(dev);
 736                        status=inb(ioaddr+TANG_CARD_STATUS);
 737                } while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
 738        }
 739
 740        return IRQ_HANDLED;
 741}
 742
 743/*
 744 *      We have a good packet(s), get it/them out of the buffers.
 745 */
 746static void cops_rx(struct net_device *dev)
 747{
 748        int pkt_len = 0;
 749        int rsp_type = 0;
 750        struct sk_buff *skb = NULL;
 751        struct cops_local *lp = netdev_priv(dev);
 752        int ioaddr = dev->base_addr;
 753        int boguscount = 0;
 754        unsigned long flags;
 755
 756
 757        spin_lock_irqsave(&lp->lock, flags);
 758        
 759        if(lp->board==DAYNA)
 760        {
 761                outb(0, ioaddr);                /* Send out Zero length. */
 762                outb(0, ioaddr);
 763                outb(DATA_READ, ioaddr);        /* Send read command out. */
 764
 765                /* Wait for DMA to turn around. */
 766                while(++boguscount<1000000)
 767                {
 768                        barrier();
 769                        if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_READY)
 770                                break;
 771                }
 772
 773                if(boguscount==1000000)
 774                {
 775                        printk(KERN_WARNING "%s: DMA timed out.\n",dev->name);
 776                        spin_unlock_irqrestore(&lp->lock, flags);
 777                        return;
 778                }
 779        }
 780
 781        /* Get response length. */
 782        pkt_len = inb(ioaddr);
 783        pkt_len |= (inb(ioaddr) << 8);
 784        /* Input IO code. */
 785        rsp_type=inb(ioaddr);
 786
 787        /* Malloc up new buffer. */
 788        skb = dev_alloc_skb(pkt_len);
 789        if(skb == NULL)
 790        {
 791                printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n",
 792                        dev->name);
 793                dev->stats.rx_dropped++;
 794                while(pkt_len--)        /* Discard packet */
 795                        inb(ioaddr);
 796                spin_unlock_irqrestore(&lp->lock, flags);
 797                return;
 798        }
 799        skb->dev = dev;
 800        skb_put(skb, pkt_len);
 801        skb->protocol = htons(ETH_P_LOCALTALK);
 802
 803        insb(ioaddr, skb->data, pkt_len);               /* Eat the Data */
 804
 805        if(lp->board==DAYNA)
 806                outb(1, ioaddr+DAYNA_INT_CARD);         /* Interrupt the card */
 807
 808        spin_unlock_irqrestore(&lp->lock, flags);  /* Restore interrupts. */
 809
 810        /* Check for bad response length */
 811        if(pkt_len < 0 || pkt_len > MAX_LLAP_SIZE)
 812        {
 813                printk(KERN_WARNING "%s: Bad packet length of %d bytes.\n", 
 814                        dev->name, pkt_len);
 815                dev->stats.tx_errors++;
 816                dev_kfree_skb_any(skb);
 817                return;
 818        }
 819
 820        /* Set nodeid and then get out. */
 821        if(rsp_type == LAP_INIT_RSP)
 822        {       /* Nodeid taken from received packet. */
 823                lp->node_acquire = skb->data[0];
 824                dev_kfree_skb_any(skb);
 825                return;
 826        }
 827
 828        /* One last check to make sure we have a good packet. */
 829        if(rsp_type != LAP_RESPONSE)
 830        {
 831                printk(KERN_WARNING "%s: Bad packet type %d.\n", dev->name, rsp_type);
 832                dev->stats.tx_errors++;
 833                dev_kfree_skb_any(skb);
 834                return;
 835        }
 836
 837        skb_reset_mac_header(skb);    /* Point to entire packet. */
 838        skb_pull(skb,3);
 839        skb_reset_transport_header(skb);    /* Point to data (Skip header). */
 840
 841        /* Update the counters. */
 842        dev->stats.rx_packets++;
 843        dev->stats.rx_bytes += skb->len;
 844
 845        /* Send packet to a higher place. */
 846        netif_rx(skb);
 847}
 848
 849static void cops_timeout(struct net_device *dev, unsigned int txqueue)
 850{
 851        struct cops_local *lp = netdev_priv(dev);
 852        int ioaddr = dev->base_addr;
 853
 854        dev->stats.tx_errors++;
 855        if(lp->board==TANGENT)
 856        {
 857                if((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
 858                        printk(KERN_WARNING "%s: No TX complete interrupt.\n", dev->name);
 859        }
 860        printk(KERN_WARNING "%s: Transmit timed out.\n", dev->name);
 861        cops_jumpstart(dev);    /* Restart the card. */
 862        netif_trans_update(dev); /* prevent tx timeout */
 863        netif_wake_queue(dev);
 864}
 865
 866
 867/*
 868 *      Make the card transmit a LocalTalk packet.
 869 */
 870
 871static netdev_tx_t cops_send_packet(struct sk_buff *skb,
 872                                          struct net_device *dev)
 873{
 874        struct cops_local *lp = netdev_priv(dev);
 875        int ioaddr = dev->base_addr;
 876        unsigned long flags;
 877
 878        /*
 879         * Block a timer-based transmit from overlapping. 
 880         */
 881         
 882        netif_stop_queue(dev);
 883
 884        spin_lock_irqsave(&lp->lock, flags);
 885        if(lp->board == DAYNA)   /* Wait for adapter transmit buffer. */
 886                while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
 887                        cpu_relax();
 888        if(lp->board == TANGENT) /* Wait for adapter transmit buffer. */
 889                while((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
 890                        cpu_relax();
 891
 892        /* Output IO length. */
 893        outb(skb->len, ioaddr);
 894        outb(skb->len >> 8, ioaddr);
 895
 896        /* Output IO code. */
 897        outb(LAP_WRITE, ioaddr);
 898
 899        if(lp->board == DAYNA)  /* Check the transmit buffer again. */
 900                while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0);
 901
 902        outsb(ioaddr, skb->data, skb->len);     /* Send out the data. */
 903
 904        if(lp->board==DAYNA)    /* Dayna requires you kick the card */
 905                outb(1, ioaddr+DAYNA_INT_CARD);
 906
 907        spin_unlock_irqrestore(&lp->lock, flags);       /* Restore interrupts. */
 908
 909        /* Done sending packet, update counters and cleanup. */
 910        dev->stats.tx_packets++;
 911        dev->stats.tx_bytes += skb->len;
 912        dev_kfree_skb (skb);
 913        return NETDEV_TX_OK;
 914}
 915
 916/*
 917 *      Dummy function to keep the Appletalk layer happy.
 918 */
 919 
 920static void set_multicast_list(struct net_device *dev)
 921{
 922        if(cops_debug >= 3)
 923                printk("%s: set_multicast_list executed\n", dev->name);
 924}
 925
 926/*
 927 *      System ioctls for the COPS LocalTalk card.
 928 */
 929 
 930static int cops_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 931{
 932        struct cops_local *lp = netdev_priv(dev);
 933        struct sockaddr_at *sa = (struct sockaddr_at *)&ifr->ifr_addr;
 934        struct atalk_addr *aa = &lp->node_addr;
 935
 936        switch(cmd)
 937        {
 938                case SIOCSIFADDR:
 939                        /* Get and set the nodeid and network # atalkd wants. */
 940                        cops_nodeid(dev, sa->sat_addr.s_node);
 941                        aa->s_net               = sa->sat_addr.s_net;
 942                        aa->s_node              = lp->node_acquire;
 943
 944                        /* Set broardcast address. */
 945                        dev->broadcast[0]       = 0xFF;
 946                        
 947                        /* Set hardware address. */
 948                        dev->dev_addr[0]        = aa->s_node;
 949                        dev->addr_len           = 1;
 950                        return 0;
 951
 952                case SIOCGIFADDR:
 953                        sa->sat_addr.s_net      = aa->s_net;
 954                        sa->sat_addr.s_node     = aa->s_node;
 955                        return 0;
 956
 957                default:
 958                        return -EOPNOTSUPP;
 959        }
 960}
 961
 962/*
 963 *      The inverse routine to cops_open().
 964 */
 965 
 966static int cops_close(struct net_device *dev)
 967{
 968        struct cops_local *lp = netdev_priv(dev);
 969
 970        /* If we were running polled, yank the timer.
 971         */
 972        if(lp->board==TANGENT && dev->irq==0)
 973                del_timer(&cops_timer);
 974
 975        netif_stop_queue(dev);
 976        return 0;
 977}
 978
 979
 980#ifdef MODULE
 981static struct net_device *cops_dev;
 982
 983MODULE_LICENSE("GPL");
 984module_param_hw(io, int, ioport, 0);
 985module_param_hw(irq, int, irq, 0);
 986module_param_hw(board_type, int, other, 0);
 987
 988static int __init cops_module_init(void)
 989{
 990        if (io == 0)
 991                printk(KERN_WARNING "%s: You shouldn't autoprobe with insmod\n",
 992                        cardname);
 993        cops_dev = cops_probe(-1);
 994        return PTR_ERR_OR_ZERO(cops_dev);
 995}
 996
 997static void __exit cops_module_exit(void)
 998{
 999        unregister_netdev(cops_dev);
1000        cleanup_card(cops_dev);
1001        free_netdev(cops_dev);
1002}
1003module_init(cops_module_init);
1004module_exit(cops_module_exit);
1005#endif /* MODULE */
1006