linux/drivers/net/ethernet/3com/3c589_cs.c
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   1/* ======================================================================
   2 *
   3 * A PCMCIA ethernet driver for the 3com 3c589 card.
   4 *
   5 * Copyright (C) 1999 David A. Hinds -- dahinds@users.sourceforge.net
   6 *
   7 * 3c589_cs.c 1.162 2001/10/13 00:08:50
   8 *
   9 * The network driver code is based on Donald Becker's 3c589 code:
  10 *
  11 * Written 1994 by Donald Becker.
  12 * Copyright 1993 United States Government as represented by the
  13 * Director, National Security Agency.  This software may be used and
  14 * distributed according to the terms of the GNU General Public License,
  15 * incorporated herein by reference.
  16 * Donald Becker may be reached at becker@scyld.com
  17 *
  18 * Updated for 2.5.x by Alan Cox <alan@lxorguk.ukuu.org.uk>
  19 *
  20 * ======================================================================
  21 */
  22
  23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25#define DRV_NAME        "3c589_cs"
  26#define DRV_VERSION     "1.162-ac"
  27
  28#include <linux/module.h>
  29#include <linux/kernel.h>
  30#include <linux/ptrace.h>
  31#include <linux/slab.h>
  32#include <linux/string.h>
  33#include <linux/timer.h>
  34#include <linux/interrupt.h>
  35#include <linux/in.h>
  36#include <linux/delay.h>
  37#include <linux/ethtool.h>
  38#include <linux/netdevice.h>
  39#include <linux/etherdevice.h>
  40#include <linux/skbuff.h>
  41#include <linux/if_arp.h>
  42#include <linux/ioport.h>
  43#include <linux/bitops.h>
  44#include <linux/jiffies.h>
  45#include <linux/uaccess.h>
  46#include <linux/io.h>
  47
  48#include <pcmcia/cistpl.h>
  49#include <pcmcia/cisreg.h>
  50#include <pcmcia/ciscode.h>
  51#include <pcmcia/ds.h>
  52
  53
  54/* To minimize the size of the driver source I only define operating
  55 * constants if they are used several times. You'll need the manual
  56 * if you want to understand driver details.
  57 */
  58
  59/* Offsets from base I/O address. */
  60#define EL3_DATA        0x00
  61#define EL3_TIMER       0x0a
  62#define EL3_CMD         0x0e
  63#define EL3_STATUS      0x0e
  64
  65#define EEPROM_READ     0x0080
  66#define EEPROM_BUSY     0x8000
  67
  68#define EL3WINDOW(win_num) outw(SelectWindow + (win_num), ioaddr + EL3_CMD)
  69
  70/* The top five bits written to EL3_CMD are a command, the lower
  71 * 11 bits are the parameter, if applicable.
  72 */
  73
  74enum c509cmd {
  75        TotalReset      = 0<<11,
  76        SelectWindow    = 1<<11,
  77        StartCoax       = 2<<11,
  78        RxDisable       = 3<<11,
  79        RxEnable        = 4<<11,
  80        RxReset         = 5<<11,
  81        RxDiscard       = 8<<11,
  82        TxEnable        = 9<<11,
  83        TxDisable       = 10<<11,
  84        TxReset         = 11<<11,
  85        FakeIntr        = 12<<11,
  86        AckIntr         = 13<<11,
  87        SetIntrEnb      = 14<<11,
  88        SetStatusEnb    = 15<<11,
  89        SetRxFilter     = 16<<11,
  90        SetRxThreshold  = 17<<11,
  91        SetTxThreshold  = 18<<11,
  92        SetTxStart      = 19<<11,
  93        StatsEnable     = 21<<11,
  94        StatsDisable    = 22<<11,
  95        StopCoax        = 23<<11
  96};
  97
  98enum c509status {
  99        IntLatch        = 0x0001,
 100        AdapterFailure  = 0x0002,
 101        TxComplete      = 0x0004,
 102        TxAvailable     = 0x0008,
 103        RxComplete      = 0x0010,
 104        RxEarly         = 0x0020,
 105        IntReq          = 0x0040,
 106        StatsFull       = 0x0080,
 107        CmdBusy         = 0x1000
 108};
 109
 110/* The SetRxFilter command accepts the following classes: */
 111enum RxFilter {
 112        RxStation       = 1,
 113        RxMulticast     = 2,
 114        RxBroadcast     = 4,
 115        RxProm          = 8
 116};
 117
 118/* Register window 1 offsets, the window used in normal operation. */
 119#define TX_FIFO         0x00
 120#define RX_FIFO         0x00
 121#define RX_STATUS       0x08
 122#define TX_STATUS       0x0B
 123#define TX_FREE         0x0C    /* Remaining free bytes in Tx buffer. */
 124
 125#define WN0_IRQ         0x08    /* Window 0: Set IRQ line in bits 12-15. */
 126#define WN4_MEDIA       0x0A    /* Window 4: Various transcvr/media bits. */
 127#define MEDIA_TP        0x00C0  /* Enable link beat and jabber for 10baseT. */
 128#define MEDIA_LED       0x0001  /* Enable link light on 3C589E cards. */
 129
 130/* Time in jiffies before concluding Tx hung */
 131#define TX_TIMEOUT      ((400*HZ)/1000)
 132
 133struct el3_private {
 134        struct pcmcia_device    *p_dev;
 135        /* For transceiver monitoring */
 136        struct timer_list       media;
 137        u16                     media_status;
 138        u16                     fast_poll;
 139        unsigned long           last_irq;
 140        spinlock_t              lock;
 141};
 142
 143static const char *if_names[] = { "auto", "10baseT", "10base2", "AUI" };
 144
 145/*====================================================================*/
 146
 147/* Module parameters */
 148
 149MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
 150MODULE_DESCRIPTION("3Com 3c589 series PCMCIA ethernet driver");
 151MODULE_LICENSE("GPL");
 152
 153#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0)
 154
 155/* Special hook for setting if_port when module is loaded */
 156INT_MODULE_PARM(if_port, 0);
 157
 158
 159/*====================================================================*/
 160
 161static int tc589_config(struct pcmcia_device *link);
 162static void tc589_release(struct pcmcia_device *link);
 163
 164static u16 read_eeprom(unsigned int ioaddr, int index);
 165static void tc589_reset(struct net_device *dev);
 166static void media_check(unsigned long arg);
 167static int el3_config(struct net_device *dev, struct ifmap *map);
 168static int el3_open(struct net_device *dev);
 169static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
 170                                        struct net_device *dev);
 171static irqreturn_t el3_interrupt(int irq, void *dev_id);
 172static void update_stats(struct net_device *dev);
 173static struct net_device_stats *el3_get_stats(struct net_device *dev);
 174static int el3_rx(struct net_device *dev);
 175static int el3_close(struct net_device *dev);
 176static void el3_tx_timeout(struct net_device *dev);
 177static void set_rx_mode(struct net_device *dev);
 178static void set_multicast_list(struct net_device *dev);
 179static const struct ethtool_ops netdev_ethtool_ops;
 180
 181static void tc589_detach(struct pcmcia_device *p_dev);
 182
 183static const struct net_device_ops el3_netdev_ops = {
 184        .ndo_open               = el3_open,
 185        .ndo_stop               = el3_close,
 186        .ndo_start_xmit         = el3_start_xmit,
 187        .ndo_tx_timeout         = el3_tx_timeout,
 188        .ndo_set_config         = el3_config,
 189        .ndo_get_stats          = el3_get_stats,
 190        .ndo_set_rx_mode        = set_multicast_list,
 191        .ndo_change_mtu         = eth_change_mtu,
 192        .ndo_set_mac_address    = eth_mac_addr,
 193        .ndo_validate_addr      = eth_validate_addr,
 194};
 195
 196static int tc589_probe(struct pcmcia_device *link)
 197{
 198        struct el3_private *lp;
 199        struct net_device *dev;
 200
 201        dev_dbg(&link->dev, "3c589_attach()\n");
 202
 203        /* Create new ethernet device */
 204        dev = alloc_etherdev(sizeof(struct el3_private));
 205        if (!dev)
 206                return -ENOMEM;
 207        lp = netdev_priv(dev);
 208        link->priv = dev;
 209        lp->p_dev = link;
 210
 211        spin_lock_init(&lp->lock);
 212        link->resource[0]->end = 16;
 213        link->resource[0]->flags |= IO_DATA_PATH_WIDTH_16;
 214
 215        link->config_flags |= CONF_ENABLE_IRQ;
 216        link->config_index = 1;
 217
 218        dev->netdev_ops = &el3_netdev_ops;
 219        dev->watchdog_timeo = TX_TIMEOUT;
 220
 221        dev->ethtool_ops = &netdev_ethtool_ops;
 222
 223        return tc589_config(link);
 224}
 225
 226static void tc589_detach(struct pcmcia_device *link)
 227{
 228        struct net_device *dev = link->priv;
 229
 230        dev_dbg(&link->dev, "3c589_detach\n");
 231
 232        unregister_netdev(dev);
 233
 234        tc589_release(link);
 235
 236        free_netdev(dev);
 237} /* tc589_detach */
 238
 239static int tc589_config(struct pcmcia_device *link)
 240{
 241        struct net_device *dev = link->priv;
 242        __be16 *phys_addr;
 243        int ret, i, j, multi = 0, fifo;
 244        unsigned int ioaddr;
 245        static const char * const ram_split[] = {"5:3", "3:1", "1:1", "3:5"};
 246        u8 *buf;
 247        size_t len;
 248
 249        dev_dbg(&link->dev, "3c589_config\n");
 250
 251        phys_addr = (__be16 *)dev->dev_addr;
 252        /* Is this a 3c562? */
 253        if (link->manf_id != MANFID_3COM)
 254                dev_info(&link->dev, "hmmm, is this really a 3Com card??\n");
 255        multi = (link->card_id == PRODID_3COM_3C562);
 256
 257        link->io_lines = 16;
 258
 259        /* For the 3c562, the base address must be xx00-xx7f */
 260        for (i = j = 0; j < 0x400; j += 0x10) {
 261                if (multi && (j & 0x80))
 262                        continue;
 263                link->resource[0]->start = j ^ 0x300;
 264                i = pcmcia_request_io(link);
 265                if (i == 0)
 266                        break;
 267        }
 268        if (i != 0)
 269                goto failed;
 270
 271        ret = pcmcia_request_irq(link, el3_interrupt);
 272        if (ret)
 273                goto failed;
 274
 275        ret = pcmcia_enable_device(link);
 276        if (ret)
 277                goto failed;
 278
 279        dev->irq = link->irq;
 280        dev->base_addr = link->resource[0]->start;
 281        ioaddr = dev->base_addr;
 282        EL3WINDOW(0);
 283
 284        /* The 3c589 has an extra EEPROM for configuration info, including
 285         * the hardware address.  The 3c562 puts the address in the CIS.
 286         */
 287        len = pcmcia_get_tuple(link, 0x88, &buf);
 288        if (buf && len >= 6) {
 289                for (i = 0; i < 3; i++)
 290                        phys_addr[i] = htons(le16_to_cpu(buf[i*2]));
 291                kfree(buf);
 292        } else {
 293                kfree(buf); /* 0 < len < 6 */
 294                for (i = 0; i < 3; i++)
 295                        phys_addr[i] = htons(read_eeprom(ioaddr, i));
 296                if (phys_addr[0] == htons(0x6060)) {
 297                        dev_err(&link->dev, "IO port conflict at 0x%03lx-0x%03lx\n",
 298                                        dev->base_addr, dev->base_addr+15);
 299                        goto failed;
 300                }
 301        }
 302
 303        /* The address and resource configuration register aren't loaded from
 304         * the EEPROM and *must* be set to 0 and IRQ3 for the PCMCIA version.
 305         */
 306
 307        outw(0x3f00, ioaddr + 8);
 308        fifo = inl(ioaddr);
 309
 310        /* The if_port symbol can be set when the module is loaded */
 311        if ((if_port >= 0) && (if_port <= 3))
 312                dev->if_port = if_port;
 313        else
 314                dev_err(&link->dev, "invalid if_port requested\n");
 315
 316        SET_NETDEV_DEV(dev, &link->dev);
 317
 318        if (register_netdev(dev) != 0) {
 319                dev_err(&link->dev, "register_netdev() failed\n");
 320                goto failed;
 321        }
 322
 323        netdev_info(dev, "3Com 3c%s, io %#3lx, irq %d, hw_addr %pM\n",
 324                        (multi ? "562" : "589"), dev->base_addr, dev->irq,
 325                        dev->dev_addr);
 326        netdev_info(dev, "  %dK FIFO split %s Rx:Tx, %s xcvr\n",
 327                        (fifo & 7) ? 32 : 8, ram_split[(fifo >> 16) & 3],
 328                        if_names[dev->if_port]);
 329        return 0;
 330
 331failed:
 332        tc589_release(link);
 333        return -ENODEV;
 334} /* tc589_config */
 335
 336static void tc589_release(struct pcmcia_device *link)
 337{
 338        pcmcia_disable_device(link);
 339}
 340
 341static int tc589_suspend(struct pcmcia_device *link)
 342{
 343        struct net_device *dev = link->priv;
 344
 345        if (link->open)
 346                netif_device_detach(dev);
 347
 348        return 0;
 349}
 350
 351static int tc589_resume(struct pcmcia_device *link)
 352{
 353        struct net_device *dev = link->priv;
 354
 355        if (link->open) {
 356                tc589_reset(dev);
 357                netif_device_attach(dev);
 358        }
 359
 360        return 0;
 361}
 362
 363/*====================================================================*/
 364
 365/* Use this for commands that may take time to finish */
 366
 367static void tc589_wait_for_completion(struct net_device *dev, int cmd)
 368{
 369        int i = 100;
 370        outw(cmd, dev->base_addr + EL3_CMD);
 371        while (--i > 0)
 372                if (!(inw(dev->base_addr + EL3_STATUS) & 0x1000))
 373                        break;
 374        if (i == 0)
 375                netdev_warn(dev, "command 0x%04x did not complete!\n", cmd);
 376}
 377
 378/* Read a word from the EEPROM using the regular EEPROM access register.
 379 * Assume that we are in register window zero.
 380 */
 381
 382static u16 read_eeprom(unsigned int ioaddr, int index)
 383{
 384        int i;
 385        outw(EEPROM_READ + index, ioaddr + 10);
 386        /* Reading the eeprom takes 162 us */
 387        for (i = 1620; i >= 0; i--)
 388                if ((inw(ioaddr + 10) & EEPROM_BUSY) == 0)
 389                        break;
 390        return inw(ioaddr + 12);
 391}
 392
 393/* Set transceiver type, perhaps to something other than what the user
 394 * specified in dev->if_port.
 395 */
 396
 397static void tc589_set_xcvr(struct net_device *dev, int if_port)
 398{
 399        struct el3_private *lp = netdev_priv(dev);
 400        unsigned int ioaddr = dev->base_addr;
 401
 402        EL3WINDOW(0);
 403        switch (if_port) {
 404        case 0:
 405        case 1:
 406                outw(0, ioaddr + 6);
 407                break;
 408        case 2:
 409                outw(3<<14, ioaddr + 6);
 410                break;
 411        case 3:
 412                outw(1<<14, ioaddr + 6);
 413                break;
 414        }
 415        /* On PCMCIA, this just turns on the LED */
 416        outw((if_port == 2) ? StartCoax : StopCoax, ioaddr + EL3_CMD);
 417        /* 10baseT interface, enable link beat and jabber check. */
 418        EL3WINDOW(4);
 419        outw(MEDIA_LED | ((if_port < 2) ? MEDIA_TP : 0), ioaddr + WN4_MEDIA);
 420        EL3WINDOW(1);
 421        if (if_port == 2)
 422                lp->media_status = ((dev->if_port == 0) ? 0x8000 : 0x4000);
 423        else
 424                lp->media_status = ((dev->if_port == 0) ? 0x4010 : 0x8800);
 425}
 426
 427static void dump_status(struct net_device *dev)
 428{
 429        unsigned int ioaddr = dev->base_addr;
 430        EL3WINDOW(1);
 431        netdev_info(dev, "  irq status %04x, rx status %04x, tx status %02x  tx free %04x\n",
 432                        inw(ioaddr+EL3_STATUS), inw(ioaddr+RX_STATUS),
 433                        inb(ioaddr+TX_STATUS), inw(ioaddr+TX_FREE));
 434        EL3WINDOW(4);
 435        netdev_info(dev, "  diagnostics: fifo %04x net %04x ethernet %04x media %04x\n",
 436                        inw(ioaddr+0x04), inw(ioaddr+0x06), inw(ioaddr+0x08),
 437                        inw(ioaddr+0x0a));
 438        EL3WINDOW(1);
 439}
 440
 441/* Reset and restore all of the 3c589 registers. */
 442static void tc589_reset(struct net_device *dev)
 443{
 444        unsigned int ioaddr = dev->base_addr;
 445        int i;
 446
 447        EL3WINDOW(0);
 448        outw(0x0001, ioaddr + 4);                       /* Activate board. */
 449        outw(0x3f00, ioaddr + 8);                       /* Set the IRQ line. */
 450
 451        /* Set the station address in window 2. */
 452        EL3WINDOW(2);
 453        for (i = 0; i < 6; i++)
 454                outb(dev->dev_addr[i], ioaddr + i);
 455
 456        tc589_set_xcvr(dev, dev->if_port);
 457
 458        /* Switch to the stats window, and clear all stats by reading. */
 459        outw(StatsDisable, ioaddr + EL3_CMD);
 460        EL3WINDOW(6);
 461        for (i = 0; i < 9; i++)
 462                inb(ioaddr+i);
 463        inw(ioaddr + 10);
 464        inw(ioaddr + 12);
 465
 466        /* Switch to register set 1 for normal use. */
 467        EL3WINDOW(1);
 468
 469        set_rx_mode(dev);
 470        outw(StatsEnable, ioaddr + EL3_CMD); /* Turn on statistics. */
 471        outw(RxEnable, ioaddr + EL3_CMD); /* Enable the receiver. */
 472        outw(TxEnable, ioaddr + EL3_CMD); /* Enable transmitter. */
 473        /* Allow status bits to be seen. */
 474        outw(SetStatusEnb | 0xff, ioaddr + EL3_CMD);
 475        /* Ack all pending events, and set active indicator mask. */
 476        outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
 477         ioaddr + EL3_CMD);
 478        outw(SetIntrEnb | IntLatch | TxAvailable | RxComplete | StatsFull
 479         | AdapterFailure, ioaddr + EL3_CMD);
 480}
 481
 482static void netdev_get_drvinfo(struct net_device *dev,
 483                               struct ethtool_drvinfo *info)
 484{
 485        strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 486        strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 487        snprintf(info->bus_info, sizeof(info->bus_info),
 488                "PCMCIA 0x%lx", dev->base_addr);
 489}
 490
 491static const struct ethtool_ops netdev_ethtool_ops = {
 492        .get_drvinfo            = netdev_get_drvinfo,
 493};
 494
 495static int el3_config(struct net_device *dev, struct ifmap *map)
 496{
 497        if ((map->port != (u_char)(-1)) && (map->port != dev->if_port)) {
 498                if (map->port <= 3) {
 499                        dev->if_port = map->port;
 500                        netdev_info(dev, "switched to %s port\n", if_names[dev->if_port]);
 501                        tc589_set_xcvr(dev, dev->if_port);
 502                } else {
 503                        return -EINVAL;
 504                }
 505        }
 506        return 0;
 507}
 508
 509static int el3_open(struct net_device *dev)
 510{
 511        struct el3_private *lp = netdev_priv(dev);
 512        struct pcmcia_device *link = lp->p_dev;
 513
 514        if (!pcmcia_dev_present(link))
 515                return -ENODEV;
 516
 517        link->open++;
 518        netif_start_queue(dev);
 519
 520        tc589_reset(dev);
 521        setup_timer(&lp->media, media_check, (unsigned long)dev);
 522        mod_timer(&lp->media, jiffies + HZ);
 523
 524        dev_dbg(&link->dev, "%s: opened, status %4.4x.\n",
 525          dev->name, inw(dev->base_addr + EL3_STATUS));
 526
 527        return 0;
 528}
 529
 530static void el3_tx_timeout(struct net_device *dev)
 531{
 532        unsigned int ioaddr = dev->base_addr;
 533
 534        netdev_warn(dev, "Transmit timed out!\n");
 535        dump_status(dev);
 536        dev->stats.tx_errors++;
 537        netif_trans_update(dev); /* prevent tx timeout */
 538        /* Issue TX_RESET and TX_START commands. */
 539        tc589_wait_for_completion(dev, TxReset);
 540        outw(TxEnable, ioaddr + EL3_CMD);
 541        netif_wake_queue(dev);
 542}
 543
 544static void pop_tx_status(struct net_device *dev)
 545{
 546        unsigned int ioaddr = dev->base_addr;
 547        int i;
 548
 549        /* Clear the Tx status stack. */
 550        for (i = 32; i > 0; i--) {
 551                u_char tx_status = inb(ioaddr + TX_STATUS);
 552                if (!(tx_status & 0x84))
 553                        break;
 554                /* reset transmitter on jabber error or underrun */
 555                if (tx_status & 0x30)
 556                        tc589_wait_for_completion(dev, TxReset);
 557                if (tx_status & 0x38) {
 558                        netdev_dbg(dev, "transmit error: status 0x%02x\n", tx_status);
 559                        outw(TxEnable, ioaddr + EL3_CMD);
 560                        dev->stats.tx_aborted_errors++;
 561                }
 562                outb(0x00, ioaddr + TX_STATUS); /* Pop the status stack. */
 563        }
 564}
 565
 566static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
 567                                        struct net_device *dev)
 568{
 569        unsigned int ioaddr = dev->base_addr;
 570        struct el3_private *priv = netdev_priv(dev);
 571        unsigned long flags;
 572
 573        netdev_dbg(dev, "el3_start_xmit(length = %ld) called, status %4.4x.\n",
 574               (long)skb->len, inw(ioaddr + EL3_STATUS));
 575
 576        spin_lock_irqsave(&priv->lock, flags);
 577
 578        dev->stats.tx_bytes += skb->len;
 579
 580        /* Put out the doubleword header... */
 581        outw(skb->len, ioaddr + TX_FIFO);
 582        outw(0x00, ioaddr + TX_FIFO);
 583        /* ... and the packet rounded to a doubleword. */
 584        outsl(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);
 585
 586        if (inw(ioaddr + TX_FREE) <= 1536) {
 587                netif_stop_queue(dev);
 588                /* Interrupt us when the FIFO has room for max-sized packet. */
 589                outw(SetTxThreshold + 1536, ioaddr + EL3_CMD);
 590        }
 591
 592        pop_tx_status(dev);
 593        spin_unlock_irqrestore(&priv->lock, flags);
 594        dev_kfree_skb(skb);
 595
 596        return NETDEV_TX_OK;
 597}
 598
 599/* The EL3 interrupt handler. */
 600static irqreturn_t el3_interrupt(int irq, void *dev_id)
 601{
 602        struct net_device *dev = (struct net_device *) dev_id;
 603        struct el3_private *lp = netdev_priv(dev);
 604        unsigned int ioaddr;
 605        __u16 status;
 606        int i = 0, handled = 1;
 607
 608        if (!netif_device_present(dev))
 609                return IRQ_NONE;
 610
 611        ioaddr = dev->base_addr;
 612
 613        netdev_dbg(dev, "interrupt, status %4.4x.\n", inw(ioaddr + EL3_STATUS));
 614
 615        spin_lock(&lp->lock);
 616        while ((status = inw(ioaddr + EL3_STATUS)) &
 617        (IntLatch | RxComplete | StatsFull)) {
 618                if ((status & 0xe000) != 0x2000) {
 619                        netdev_dbg(dev, "interrupt from dead card\n");
 620                        handled = 0;
 621                        break;
 622                }
 623                if (status & RxComplete)
 624                        el3_rx(dev);
 625                if (status & TxAvailable) {
 626                        netdev_dbg(dev, "    TX room bit was handled.\n");
 627                        /* There's room in the FIFO for a full-sized packet. */
 628                        outw(AckIntr | TxAvailable, ioaddr + EL3_CMD);
 629                        netif_wake_queue(dev);
 630                }
 631                if (status & TxComplete)
 632                        pop_tx_status(dev);
 633                if (status & (AdapterFailure | RxEarly | StatsFull)) {
 634                        /* Handle all uncommon interrupts. */
 635                        if (status & StatsFull)         /* Empty statistics. */
 636                                update_stats(dev);
 637                        if (status & RxEarly) {
 638                                /* Rx early is unused. */
 639                                el3_rx(dev);
 640                                outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
 641                        }
 642                        if (status & AdapterFailure) {
 643                                u16 fifo_diag;
 644                                EL3WINDOW(4);
 645                                fifo_diag = inw(ioaddr + 4);
 646                                EL3WINDOW(1);
 647                                netdev_warn(dev, "adapter failure, FIFO diagnostic register %04x.\n",
 648                            fifo_diag);
 649                                if (fifo_diag & 0x0400) {
 650                                        /* Tx overrun */
 651                                        tc589_wait_for_completion(dev, TxReset);
 652                                        outw(TxEnable, ioaddr + EL3_CMD);
 653                                }
 654                                if (fifo_diag & 0x2000) {
 655                                        /* Rx underrun */
 656                                        tc589_wait_for_completion(dev, RxReset);
 657                                        set_rx_mode(dev);
 658                                        outw(RxEnable, ioaddr + EL3_CMD);
 659                                }
 660                                outw(AckIntr | AdapterFailure, ioaddr + EL3_CMD);
 661                        }
 662                }
 663                if (++i > 10) {
 664                        netdev_err(dev, "infinite loop in interrupt, status %4.4x.\n",
 665                                        status);
 666                        /* Clear all interrupts */
 667                        outw(AckIntr | 0xFF, ioaddr + EL3_CMD);
 668                        break;
 669                }
 670                /* Acknowledge the IRQ. */
 671                outw(AckIntr | IntReq | IntLatch, ioaddr + EL3_CMD);
 672        }
 673        lp->last_irq = jiffies;
 674        spin_unlock(&lp->lock);
 675        netdev_dbg(dev, "exiting interrupt, status %4.4x.\n",
 676                        inw(ioaddr + EL3_STATUS));
 677        return IRQ_RETVAL(handled);
 678}
 679
 680static void media_check(unsigned long arg)
 681{
 682        struct net_device *dev = (struct net_device *)(arg);
 683        struct el3_private *lp = netdev_priv(dev);
 684        unsigned int ioaddr = dev->base_addr;
 685        u16 media, errs;
 686        unsigned long flags;
 687
 688        if (!netif_device_present(dev))
 689                goto reschedule;
 690
 691        /* Check for pending interrupt with expired latency timer: with
 692         * this, we can limp along even if the interrupt is blocked
 693         */
 694        if ((inw(ioaddr + EL3_STATUS) & IntLatch) &&
 695        (inb(ioaddr + EL3_TIMER) == 0xff)) {
 696                if (!lp->fast_poll)
 697                        netdev_warn(dev, "interrupt(s) dropped!\n");
 698
 699                local_irq_save(flags);
 700                el3_interrupt(dev->irq, dev);
 701                local_irq_restore(flags);
 702
 703                lp->fast_poll = HZ;
 704        }
 705        if (lp->fast_poll) {
 706                lp->fast_poll--;
 707                lp->media.expires = jiffies + HZ/100;
 708                add_timer(&lp->media);
 709                return;
 710        }
 711
 712        /* lp->lock guards the EL3 window. Window should always be 1 except
 713         * when the lock is held
 714         */
 715
 716        spin_lock_irqsave(&lp->lock, flags);
 717        EL3WINDOW(4);
 718        media = inw(ioaddr+WN4_MEDIA) & 0xc810;
 719
 720        /* Ignore collisions unless we've had no irq's recently */
 721        if (time_before(jiffies, lp->last_irq + HZ)) {
 722                media &= ~0x0010;
 723        } else {
 724                /* Try harder to detect carrier errors */
 725                EL3WINDOW(6);
 726                outw(StatsDisable, ioaddr + EL3_CMD);
 727                errs = inb(ioaddr + 0);
 728                outw(StatsEnable, ioaddr + EL3_CMD);
 729                dev->stats.tx_carrier_errors += errs;
 730                if (errs || (lp->media_status & 0x0010))
 731                        media |= 0x0010;
 732        }
 733
 734        if (media != lp->media_status) {
 735                if ((media & lp->media_status & 0x8000) &&
 736                                ((lp->media_status ^ media) & 0x0800))
 737                netdev_info(dev, "%s link beat\n",
 738                                (lp->media_status & 0x0800 ? "lost" : "found"));
 739                else if ((media & lp->media_status & 0x4000) &&
 740                 ((lp->media_status ^ media) & 0x0010))
 741                netdev_info(dev, "coax cable %s\n",
 742                                (lp->media_status & 0x0010 ? "ok" : "problem"));
 743                if (dev->if_port == 0) {
 744                        if (media & 0x8000) {
 745                                if (media & 0x0800)
 746                                        netdev_info(dev, "flipped to 10baseT\n");
 747                                else
 748                        tc589_set_xcvr(dev, 2);
 749                        } else if (media & 0x4000) {
 750                                if (media & 0x0010)
 751                                        tc589_set_xcvr(dev, 1);
 752                                else
 753                                        netdev_info(dev, "flipped to 10base2\n");
 754                        }
 755                }
 756                lp->media_status = media;
 757        }
 758
 759        EL3WINDOW(1);
 760        spin_unlock_irqrestore(&lp->lock, flags);
 761
 762reschedule:
 763        lp->media.expires = jiffies + HZ;
 764        add_timer(&lp->media);
 765}
 766
 767static struct net_device_stats *el3_get_stats(struct net_device *dev)
 768{
 769        struct el3_private *lp = netdev_priv(dev);
 770        unsigned long flags;
 771        struct pcmcia_device *link = lp->p_dev;
 772
 773        if (pcmcia_dev_present(link)) {
 774                spin_lock_irqsave(&lp->lock, flags);
 775                update_stats(dev);
 776                spin_unlock_irqrestore(&lp->lock, flags);
 777        }
 778        return &dev->stats;
 779}
 780
 781/* Update statistics.  We change to register window 6, so this should be run
 782* single-threaded if the device is active. This is expected to be a rare
 783* operation, and it's simpler for the rest of the driver to assume that
 784* window 1 is always valid rather than use a special window-state variable.
 785*
 786* Caller must hold the lock for this
 787*/
 788
 789static void update_stats(struct net_device *dev)
 790{
 791        unsigned int ioaddr = dev->base_addr;
 792
 793        netdev_dbg(dev, "updating the statistics.\n");
 794        /* Turn off statistics updates while reading. */
 795        outw(StatsDisable, ioaddr + EL3_CMD);
 796        /* Switch to the stats window, and read everything. */
 797        EL3WINDOW(6);
 798        dev->stats.tx_carrier_errors    += inb(ioaddr + 0);
 799        dev->stats.tx_heartbeat_errors  += inb(ioaddr + 1);
 800        /* Multiple collisions. */
 801        inb(ioaddr + 2);
 802        dev->stats.collisions           += inb(ioaddr + 3);
 803        dev->stats.tx_window_errors             += inb(ioaddr + 4);
 804        dev->stats.rx_fifo_errors               += inb(ioaddr + 5);
 805        dev->stats.tx_packets           += inb(ioaddr + 6);
 806        /* Rx packets   */
 807        inb(ioaddr + 7);
 808        /* Tx deferrals */
 809        inb(ioaddr + 8);
 810        /* Rx octets */
 811        inw(ioaddr + 10);
 812        /* Tx octets */
 813        inw(ioaddr + 12);
 814
 815        /* Back to window 1, and turn statistics back on. */
 816        EL3WINDOW(1);
 817        outw(StatsEnable, ioaddr + EL3_CMD);
 818}
 819
 820static int el3_rx(struct net_device *dev)
 821{
 822        unsigned int ioaddr = dev->base_addr;
 823        int worklimit = 32;
 824        short rx_status;
 825
 826        netdev_dbg(dev, "in rx_packet(), status %4.4x, rx_status %4.4x.\n",
 827               inw(ioaddr+EL3_STATUS), inw(ioaddr+RX_STATUS));
 828        while (!((rx_status = inw(ioaddr + RX_STATUS)) & 0x8000) &&
 829                    worklimit > 0) {
 830                worklimit--;
 831                if (rx_status & 0x4000) { /* Error, update stats. */
 832                        short error = rx_status & 0x3800;
 833                        dev->stats.rx_errors++;
 834                        switch (error) {
 835                        case 0x0000:
 836                                dev->stats.rx_over_errors++;
 837                                break;
 838                        case 0x0800:
 839                                dev->stats.rx_length_errors++;
 840                                break;
 841                        case 0x1000:
 842                                dev->stats.rx_frame_errors++;
 843                                break;
 844                        case 0x1800:
 845                                dev->stats.rx_length_errors++;
 846                                break;
 847                        case 0x2000:
 848                                dev->stats.rx_frame_errors++;
 849                                break;
 850                        case 0x2800:
 851                                dev->stats.rx_crc_errors++;
 852                                break;
 853                        }
 854                } else {
 855                        short pkt_len = rx_status & 0x7ff;
 856                        struct sk_buff *skb;
 857
 858                        skb = netdev_alloc_skb(dev, pkt_len + 5);
 859
 860                        netdev_dbg(dev, "    Receiving packet size %d status %4.4x.\n",
 861                       pkt_len, rx_status);
 862                        if (skb != NULL) {
 863                                skb_reserve(skb, 2);
 864                                insl(ioaddr+RX_FIFO, skb_put(skb, pkt_len),
 865                        (pkt_len+3)>>2);
 866                                skb->protocol = eth_type_trans(skb, dev);
 867                                netif_rx(skb);
 868                                dev->stats.rx_packets++;
 869                                dev->stats.rx_bytes += pkt_len;
 870                        } else {
 871                                netdev_dbg(dev, "couldn't allocate a sk_buff of size %d.\n",
 872                           pkt_len);
 873                                dev->stats.rx_dropped++;
 874                        }
 875                }
 876                /* Pop the top of the Rx FIFO */
 877                tc589_wait_for_completion(dev, RxDiscard);
 878        }
 879        if (worklimit == 0)
 880                netdev_warn(dev, "too much work in el3_rx!\n");
 881        return 0;
 882}
 883
 884static void set_rx_mode(struct net_device *dev)
 885{
 886        unsigned int ioaddr = dev->base_addr;
 887        u16 opts = SetRxFilter | RxStation | RxBroadcast;
 888
 889        if (dev->flags & IFF_PROMISC)
 890                opts |= RxMulticast | RxProm;
 891        else if (!netdev_mc_empty(dev) || (dev->flags & IFF_ALLMULTI))
 892                opts |= RxMulticast;
 893        outw(opts, ioaddr + EL3_CMD);
 894}
 895
 896static void set_multicast_list(struct net_device *dev)
 897{
 898        struct el3_private *priv = netdev_priv(dev);
 899        unsigned long flags;
 900
 901        spin_lock_irqsave(&priv->lock, flags);
 902        set_rx_mode(dev);
 903        spin_unlock_irqrestore(&priv->lock, flags);
 904}
 905
 906static int el3_close(struct net_device *dev)
 907{
 908        struct el3_private *lp = netdev_priv(dev);
 909        struct pcmcia_device *link = lp->p_dev;
 910        unsigned int ioaddr = dev->base_addr;
 911
 912        dev_dbg(&link->dev, "%s: shutting down ethercard.\n", dev->name);
 913
 914        if (pcmcia_dev_present(link)) {
 915                /* Turn off statistics ASAP.  We update dev->stats below. */
 916                outw(StatsDisable, ioaddr + EL3_CMD);
 917
 918                /* Disable the receiver and transmitter. */
 919                outw(RxDisable, ioaddr + EL3_CMD);
 920                outw(TxDisable, ioaddr + EL3_CMD);
 921
 922                if (dev->if_port == 2)
 923                        /* Turn off thinnet power.  Green! */
 924                        outw(StopCoax, ioaddr + EL3_CMD);
 925                else if (dev->if_port == 1) {
 926                        /* Disable link beat and jabber */
 927                        EL3WINDOW(4);
 928                        outw(0, ioaddr + WN4_MEDIA);
 929                }
 930
 931                /* Switching back to window 0 disables the IRQ. */
 932                EL3WINDOW(0);
 933                /* But we explicitly zero the IRQ line select anyway. */
 934                outw(0x0f00, ioaddr + WN0_IRQ);
 935
 936                /* Check if the card still exists */
 937                if ((inw(ioaddr+EL3_STATUS) & 0xe000) == 0x2000)
 938                        update_stats(dev);
 939        }
 940
 941        link->open--;
 942        netif_stop_queue(dev);
 943        del_timer_sync(&lp->media);
 944
 945        return 0;
 946}
 947
 948static const struct pcmcia_device_id tc589_ids[] = {
 949        PCMCIA_MFC_DEVICE_MANF_CARD(0, 0x0101, 0x0562),
 950        PCMCIA_MFC_DEVICE_PROD_ID1(0, "Motorola MARQUIS", 0xf03e4e77),
 951        PCMCIA_DEVICE_MANF_CARD(0x0101, 0x0589),
 952        PCMCIA_DEVICE_PROD_ID12("Farallon", "ENet", 0x58d93fc4, 0x992c2202),
 953        PCMCIA_MFC_DEVICE_CIS_MANF_CARD(0, 0x0101, 0x0035, "cis/3CXEM556.cis"),
 954        PCMCIA_MFC_DEVICE_CIS_MANF_CARD(0, 0x0101, 0x003d, "cis/3CXEM556.cis"),
 955        PCMCIA_DEVICE_NULL,
 956};
 957MODULE_DEVICE_TABLE(pcmcia, tc589_ids);
 958
 959static struct pcmcia_driver tc589_driver = {
 960        .owner          = THIS_MODULE,
 961        .name           = "3c589_cs",
 962        .probe          = tc589_probe,
 963        .remove         = tc589_detach,
 964        .id_table       = tc589_ids,
 965        .suspend        = tc589_suspend,
 966        .resume         = tc589_resume,
 967};
 968module_pcmcia_driver(tc589_driver);
 969