drivers/net/de600.c

   1 static const char version[] = "de600.c: $Revision: 1.41-2.5 $,  Bjorn Ekwall (bj0rn@blox.se)\n";
   2 /*
   3  *      de600.c
   4  *
   5  *      Linux driver for the D-Link DE-600 Ethernet pocket adapter.
   6  *
   7  *      Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
   8  *      The Author may be reached as bj0rn@blox.se
   9  *
  10  *      Based on adapter information gathered from DE600.ASM by D-Link Inc.,
  11  *      as included on disk C in the v.2.11 of PC/TCP from FTP Software.
  12  *      For DE600.asm:
  13  *              Portions (C) Copyright 1990 D-Link, Inc.
  14  *              Copyright, 1988-1992, Russell Nelson, Crynwr Software
  15  *
  16  *      Adapted to the sample network driver core for linux,
  17  *      written by: Donald Becker <becker@super.org>
  18  *              (Now at <becker@scyld.com>)
  19  *
  20  **************************************************************/
  21 /*
  22  *      This program is free software; you can redistribute it and/or modify
  23  *      it under the terms of the GNU General Public License as published by
  24  *      the Free Software Foundation; either version 2, or (at your option)
  25  *      any later version.
  26  *
  27  *      This program is distributed in the hope that it will be useful,
  28  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30  *      GNU General Public License for more details.
  31  *
  32  *      You should have received a copy of the GNU General Public License
  33  *      along with this program; if not, write to the Free Software
  34  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  35  *
  36  **************************************************************/
  37
  38 /* Add more time here if your adapter won't work OK: */
  39 #define DE600_SLOW_DOWN udelay(delay_time)
  40
  41 #include <linux/module.h>
  42 #include <linux/kernel.h>
  43 #include <linux/types.h>
  44 #include <linux/fcntl.h>
  45 #include <linux/string.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/ioport.h>
  48 #include <linux/in.h>
  49 #include <asm/system.h>
  50 #include <linux/errno.h>
  51 #include <linux/init.h>
  52 #include <linux/delay.h>
  53 #include <linux/inet.h>
  54 #include <linux/netdevice.h>
  55 #include <linux/etherdevice.h>
  56 #include <linux/skbuff.h>
  57
  58 #include <asm/io.h>
  59
  60 #include "de600.h"
  61
  62 static unsigned int check_lost = 1;
  63 module_param(check_lost, bool, 0);
  64 MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
  65
  66 static unsigned int delay_time = 10;
  67 module_param(delay_time, int, 0);
  68 MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
  69
  70
  71 /*
  72  * D-Link driver variables:
  73  */
  74
  75 static volatile int             rx_page;
  76
  77 #define TX_PAGES 2
  78 static volatile int             tx_fifo[TX_PAGES];
  79 static volatile int             tx_fifo_in;
  80 static volatile int             tx_fifo_out;
  81 static volatile int             free_tx_pages = TX_PAGES;
  82 static int                      was_down;
  83 static DEFINE_SPINLOCK(de600_lock);
  84
  85 static inline u8 de600_read_status(struct net_device *dev)
  86 {
  87         u8 status;
  88
  89         outb_p(STATUS, DATA_PORT);
  90         status = inb(STATUS_PORT);
  91         outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
  92
  93         return status;
  94 }
  95
  96 static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
  97 {
  98         /* dev used by macros */
  99         u8 lo;
 100         outb_p((type), DATA_PORT);
 101         lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
 102         outb_p((type) | HI_NIBBLE, DATA_PORT);
 103         return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
 104 }
 105
 106 /*
 107  * Open/initialize the board.  This is called (in the current kernel)
 108  * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
 109  *
 110  * This routine should set everything up anew at each open, even
 111  * registers that "should" only need to be set once at boot, so that
 112  * there is a non-reboot way to recover if something goes wrong.
 113  */
 114
 115 static int de600_open(struct net_device *dev)
 116 {
 117         unsigned long flags;
 118         int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
 119         if (ret) {
 120                 printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
 121                 return ret;
 122         }
 123         spin_lock_irqsave(&de600_lock, flags);
 124         ret = adapter_init(dev);
 125         spin_unlock_irqrestore(&de600_lock, flags);
 126         return ret;
 127 }
 128
 129 /*
 130  * The inverse routine to de600_open().
 131  */
 132
 133 static int de600_close(struct net_device *dev)
 134 {
 135         select_nic();
 136         rx_page = 0;
 137         de600_put_command(RESET);
 138         de600_put_command(STOP_RESET);
 139         de600_put_command(0);
 140         select_prn();
 141         free_irq(DE600_IRQ, dev);
 142         return 0;
 143 }
 144
 145 static inline void trigger_interrupt(struct net_device *dev)
 146 {
 147         de600_put_command(FLIP_IRQ);
 148         select_prn();
 149         DE600_SLOW_DOWN;
 150         select_nic();
 151         de600_put_command(0);
 152 }
 153
 154 /*
 155  * Copy a buffer to the adapter transmit page memory.
 156  * Start sending.
 157  */
 158
 159 static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
 160 {
 161         unsigned long flags;
 162         int     transmit_from;
 163         int     len;
 164         int     tickssofar;
 165         u8      *buffer = skb->data;
 166         int     i;
 167
 168         if (free_tx_pages <= 0) {       /* Do timeouts, to avoid hangs. */
 169                 tickssofar = jiffies - dev_trans_start(dev);
 170                 if (tickssofar < HZ/20)
 171                         return NETDEV_TX_BUSY;
 172                 /* else */
 173                 printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
 174                 /* Restart the adapter. */
 175                 spin_lock_irqsave(&de600_lock, flags);
 176                 if (adapter_init(dev)) {
 177                         spin_unlock_irqrestore(&de600_lock, flags);
 178                         return NETDEV_TX_BUSY;
 179                 }
 180                 spin_unlock_irqrestore(&de600_lock, flags);
 181         }
 182
 183         /* Start real output */
 184         pr_debug("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages);
 185
 186         if ((len = skb->len) < RUNT)
 187                 len = RUNT;
 188
 189         spin_lock_irqsave(&de600_lock, flags);
 190         select_nic();
 191         tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
 192         tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
 193
 194         if(check_lost)
 195         {
 196                 /* This costs about 40 instructions per packet... */
 197                 de600_setup_address(NODE_ADDRESS, RW_ADDR);
 198                 de600_read_byte(READ_DATA, dev);
 199                 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
 200                         if (adapter_init(dev)) {
 201                                 spin_unlock_irqrestore(&de600_lock, flags);
 202                                 return NETDEV_TX_BUSY;
 203                         }
 204                 }
 205         }
 206
 207         de600_setup_address(transmit_from, RW_ADDR);
 208         for (i = 0;  i < skb->len ; ++i, ++buffer)
 209                 de600_put_byte(*buffer);
 210         for (; i < len; ++i)
 211                 de600_put_byte(0);
 212
 213         if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
 214                 dev->trans_start = jiffies;
 215                 netif_start_queue(dev); /* allow more packets into adapter */
 216                 /* Send page and generate a faked interrupt */
 217                 de600_setup_address(transmit_from, TX_ADDR);
 218                 de600_put_command(TX_ENABLE);
 219         }
 220         else {
 221                 if (free_tx_pages)
 222                         netif_start_queue(dev);
 223                 else
 224                         netif_stop_queue(dev);
 225                 select_prn();
 226         }
 227         spin_unlock_irqrestore(&de600_lock, flags);
 228         dev_kfree_skb(skb);
 229         return NETDEV_TX_OK;
 230 }
 231
 232 /*
 233  * The typical workload of the driver:
 234  * Handle the network interface interrupts.
 235  */
 236
 237 static irqreturn_t de600_interrupt(int irq, void *dev_id)
 238 {
 239         struct net_device       *dev = dev_id;
 240         u8              irq_status;
 241         int             retrig = 0;
 242         int             boguscount = 0;
 243
 244         spin_lock(&de600_lock);
 245
 246         select_nic();
 247         irq_status = de600_read_status(dev);
 248
 249         do {
 250                 pr_debug("de600_interrupt (%02X)\n", irq_status);
 251
 252                 if (irq_status & RX_GOOD)
 253                         de600_rx_intr(dev);
 254                 else if (!(irq_status & RX_BUSY))
 255                         de600_put_command(RX_ENABLE);
 256
 257                 /* Any transmission in progress? */
 258                 if (free_tx_pages < TX_PAGES)
 259                         retrig = de600_tx_intr(dev, irq_status);
 260                 else
 261                         retrig = 0;
 262
 263                 irq_status = de600_read_status(dev);
 264         } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
 265         /*
 266          * Yeah, it _looks_ like busy waiting, smells like busy waiting
 267          * and I know it's not PC, but please, it will only occur once
 268          * in a while and then only for a loop or so (< 1ms for sure!)
 269          */
 270
 271         /* Enable adapter interrupts */
 272         select_prn();
 273         if (retrig)
 274                 trigger_interrupt(dev);
 275         spin_unlock(&de600_lock);
 276         return IRQ_HANDLED;
 277 }
 278
 279 static int de600_tx_intr(struct net_device *dev, int irq_status)
 280 {
 281         /*
 282          * Returns 1 if tx still not done
 283          */
 284
 285         /* Check if current transmission is done yet */
 286         if (irq_status & TX_BUSY)
 287                 return 1; /* tx not done, try again */
 288
 289         /* else */
 290         /* If last transmission OK then bump fifo index */
 291         if (!(irq_status & TX_FAILED16)) {
 292                 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
 293                 ++free_tx_pages;
 294                 dev->stats.tx_packets++;
 295                 netif_wake_queue(dev);
 296         }
 297
 298         /* More to send, or resend last packet? */
 299         if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
 300                 dev->trans_start = jiffies;
 301                 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
 302                 de600_put_command(TX_ENABLE);
 303                 return 1;
 304         }
 305         /* else */
 306
 307         return 0;
 308 }
 309
 310 /*
 311  * We have a good packet, get it out of the adapter.
 312  */
 313 static void de600_rx_intr(struct net_device *dev)
 314 {
 315         struct sk_buff  *skb;
 316         int             i;
 317         int             read_from;
 318         int             size;
 319         unsigned char   *buffer;
 320
 321         /* Get size of received packet */
 322         size = de600_read_byte(RX_LEN, dev);    /* low byte */
 323         size += (de600_read_byte(RX_LEN, dev) << 8);    /* high byte */
 324         size -= 4;      /* Ignore trailing 4 CRC-bytes */
 325
 326         /* Tell adapter where to store next incoming packet, enable receiver */
 327         read_from = rx_page_adr();
 328         next_rx_page();
 329         de600_put_command(RX_ENABLE);
 330
 331         if ((size < 32)  ||  (size > 1535)) {
 332                 printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
 333                 if (size > 10000)
 334                         adapter_init(dev);
 335                 return;
 336         }
 337
 338         skb = dev_alloc_skb(size+2);
 339         if (skb == NULL) {
 340                 printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
 341                 return;
 342         }
 343         /* else */
 344
 345         skb_reserve(skb,2);     /* Align */
 346
 347         /* 'skb->data' points to the start of sk_buff data area. */
 348         buffer = skb_put(skb,size);
 349
 350         /* copy the packet into the buffer */
 351         de600_setup_address(read_from, RW_ADDR);
 352         for (i = size; i > 0; --i, ++buffer)
 353                 *buffer = de600_read_byte(READ_DATA, dev);
 354
 355         skb->protocol=eth_type_trans(skb,dev);
 356
 357         netif_rx(skb);
 358
 359         /* update stats */
 360         dev->stats.rx_packets++; /* count all receives */
 361         dev->stats.rx_bytes += size; /* count all received bytes */
 362
 363         /*
 364          * If any worth-while packets have been received, netif_rx()
 365          * will work on them when we get to the tasklets.
 366          */
 367 }
 368
 369 static const struct net_device_ops de600_netdev_ops = {
 370         .ndo_open               = de600_open,
 371         .ndo_stop               = de600_close,
 372         .ndo_start_xmit         = de600_start_xmit,
 373         .ndo_change_mtu         = eth_change_mtu,
 374         .ndo_set_mac_address    = eth_mac_addr,
 375         .ndo_validate_addr      = eth_validate_addr,
 376 };
 377
 378
 379 static struct net_device * __init de600_probe(void)
 380 {
 381         int     i;
 382         struct net_device *dev;
 383         int err;
 384
 385         dev = alloc_etherdev(0);
 386         if (!dev)
 387                 return ERR_PTR(-ENOMEM);
 388
 389
 390         if (!request_region(DE600_IO, 3, "de600")) {
 391                 printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
 392                 err = -EBUSY;
 393                 goto out;
 394         }
 395
 396         printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
 397         /* Alpha testers must have the version number to report bugs. */
 398         pr_debug("%s", version);
 399
 400         /* probe for adapter */
 401         err = -ENODEV;
 402         rx_page = 0;
 403         select_nic();
 404         (void)de600_read_status(dev);
 405         de600_put_command(RESET);
 406         de600_put_command(STOP_RESET);
 407         if (de600_read_status(dev) & 0xf0) {
 408                 printk(": not at I/O %#3x.\n", DATA_PORT);
 409                 goto out1;
 410         }
 411
 412         /*
 413          * Maybe we found one,
 414          * have to check if it is a D-Link DE-600 adapter...
 415          */
 416
 417         /* Get the adapter ethernet address from the ROM */
 418         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 419         for (i = 0; i < ETH_ALEN; i++) {
 420                 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
 421                 dev->broadcast[i] = 0xff;
 422         }
 423
 424         /* Check magic code */
 425         if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
 426                 /* OK, install real address */
 427                 dev->dev_addr[0] = 0x00;
 428                 dev->dev_addr[1] = 0x80;
 429                 dev->dev_addr[2] = 0xc8;
 430                 dev->dev_addr[3] &= 0x0f;
 431                 dev->dev_addr[3] |= 0x70;
 432         } else {
 433                 printk(" not identified in the printer port\n");
 434                 goto out1;
 435         }
 436
 437         printk(", Ethernet Address: %pM\n", dev->dev_addr);
 438
 439         dev->netdev_ops = &de600_netdev_ops;
 440
 441         dev->flags&=~IFF_MULTICAST;
 442
 443         select_prn();
 444
 445         err = register_netdev(dev);
 446         if (err)
 447                 goto out1;
 448
 449         return dev;
 450
 451 out1:
 452         release_region(DE600_IO, 3);
 453 out:
 454         free_netdev(dev);
 455         return ERR_PTR(err);
 456 }
 457
 458 static int adapter_init(struct net_device *dev)
 459 {
 460         int     i;
 461
 462         select_nic();
 463         rx_page = 0; /* used by RESET */
 464         de600_put_command(RESET);
 465         de600_put_command(STOP_RESET);
 466
 467         /* Check if it is still there... */
 468         /* Get the some bytes of the adapter ethernet address from the ROM */
 469         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 470         de600_read_byte(READ_DATA, dev);
 471         if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
 472             (de600_read_byte(READ_DATA, dev) != 0x15)) {
 473         /* was: if (de600_read_status(dev) & 0xf0) { */
 474                 printk("Something has happened to the DE-600!  Please check it and do a new ifconfig!\n");
 475                 /* Goodbye, cruel world... */
 476                 dev->flags &= ~IFF_UP;
 477                 de600_close(dev);
 478                 was_down = 1;
 479                 netif_stop_queue(dev); /* Transmit busy...  */
 480                 return 1; /* failed */
 481         }
 482
 483         if (was_down) {
 484                 printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
 485                 was_down = 0;
 486         }
 487
 488         tx_fifo_in = 0;
 489         tx_fifo_out = 0;
 490         free_tx_pages = TX_PAGES;
 491
 492
 493         /* set the ether address. */
 494         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 495         for (i = 0; i < ETH_ALEN; i++)
 496                 de600_put_byte(dev->dev_addr[i]);
 497
 498         /* where to start saving incoming packets */
 499         rx_page = RX_BP | RX_BASE_PAGE;
 500         de600_setup_address(MEM_4K, RW_ADDR);
 501         /* Enable receiver */
 502         de600_put_command(RX_ENABLE);
 503         select_prn();
 504
 505         netif_start_queue(dev);
 506
 507         return 0; /* OK */
 508 }
 509
 510 static struct net_device *de600_dev;
 511
 512 static int __init de600_init(void)
 513 {
 514         de600_dev = de600_probe();
 515         if (IS_ERR(de600_dev))
 516                 return PTR_ERR(de600_dev);
 517         return 0;
 518 }
 519
 520 static void __exit de600_exit(void)
 521 {
 522         unregister_netdev(de600_dev);
 523         release_region(DE600_IO, 3);
 524         free_netdev(de600_dev);
 525 }
 526
 527 module_init(de600_init);
 528 module_exit(de600_exit);
 529
 530 MODULE_LICENSE("GPL");