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  /*
  42  * If you still have trouble reading/writing to the adapter,
  43  * modify the following "#define": (see <asm/io.h> for more info)
  44 #define REALLY_SLOW_IO
  45  */
  46 #define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */
  47
  48 /* use 0 for production, 1 for verification, >2 for debug */
  49 #ifdef DE600_DEBUG
  50 #define PRINTK(x) if (de600_debug >= 2) printk x
  51 #else
  52 #define DE600_DEBUG 0
  53 #define PRINTK(x) /**/
  54 #endif
  55
  56 #include <linux/module.h>
  57 #include <linux/kernel.h>
  58 #include <linux/types.h>
  59 #include <linux/fcntl.h>
  60 #include <linux/string.h>
  61 #include <linux/interrupt.h>
  62 #include <linux/ioport.h>
  63 #include <linux/in.h>
  64 #include <asm/system.h>
  65 #include <linux/errno.h>
  66 #include <linux/init.h>
  67 #include <linux/delay.h>
  68 #include <linux/inet.h>
  69 #include <linux/netdevice.h>
  70 #include <linux/etherdevice.h>
  71 #include <linux/skbuff.h>
  72
  73 #include <asm/io.h>
  74
  75 #include "de600.h"
  76
  77 static unsigned int de600_debug = DE600_DEBUG;
  78 module_param(de600_debug, int, 0);
  79 MODULE_PARM_DESC(de600_debug, "DE-600 debug level (0-2)");
  80
  81 static unsigned int check_lost = 1;
  82 module_param(check_lost, bool, 0);
  83 MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
  84
  85 static unsigned int delay_time = 10;
  86 module_param(delay_time, int, 0);
  87 MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
  88
  89
  90 /*
  91  * D-Link driver variables:
  92  */
  93
  94 static volatile int             rx_page;
  95
  96 #define TX_PAGES 2
  97 static volatile int             tx_fifo[TX_PAGES];
  98 static volatile int             tx_fifo_in;
  99 static volatile int             tx_fifo_out;
 100 static volatile int             free_tx_pages = TX_PAGES;
 101 static int                      was_down;
 102 static DEFINE_SPINLOCK(de600_lock);
 103
 104 static inline u8 de600_read_status(struct net_device *dev)
 105 {
 106         u8 status;
 107
 108         outb_p(STATUS, DATA_PORT);
 109         status = inb(STATUS_PORT);
 110         outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
 111
 112         return status;
 113 }
 114
 115 static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
 116 {
 117         /* dev used by macros */
 118         u8 lo;
 119         outb_p((type), DATA_PORT);
 120         lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
 121         outb_p((type) | HI_NIBBLE, DATA_PORT);
 122         return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
 123 }
 124
 125 /*
 126  * Open/initialize the board.  This is called (in the current kernel)
 127  * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
 128  *
 129  * This routine should set everything up anew at each open, even
 130  * registers that "should" only need to be set once at boot, so that
 131  * there is a non-reboot way to recover if something goes wrong.
 132  */
 133
 134 static int de600_open(struct net_device *dev)
 135 {
 136         unsigned long flags;
 137         int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
 138         if (ret) {
 139                 printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
 140                 return ret;
 141         }
 142         spin_lock_irqsave(&de600_lock, flags);
 143         ret = adapter_init(dev);
 144         spin_unlock_irqrestore(&de600_lock, flags);
 145         return ret;
 146 }
 147
 148 /*
 149  * The inverse routine to de600_open().
 150  */
 151
 152 static int de600_close(struct net_device *dev)
 153 {
 154         select_nic();
 155         rx_page = 0;
 156         de600_put_command(RESET);
 157         de600_put_command(STOP_RESET);
 158         de600_put_command(0);
 159         select_prn();
 160         free_irq(DE600_IRQ, dev);
 161         return 0;
 162 }
 163
 164 static struct net_device_stats *get_stats(struct net_device *dev)
 165 {
 166         return (struct net_device_stats *)(dev->priv);
 167 }
 168
 169 static inline void trigger_interrupt(struct net_device *dev)
 170 {
 171         de600_put_command(FLIP_IRQ);
 172         select_prn();
 173         DE600_SLOW_DOWN;
 174         select_nic();
 175         de600_put_command(0);
 176 }
 177
 178 /*
 179  * Copy a buffer to the adapter transmit page memory.
 180  * Start sending.
 181  */
 182
 183 static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
 184 {
 185         unsigned long flags;
 186         int     transmit_from;
 187         int     len;
 188         int     tickssofar;
 189         u8      *buffer = skb->data;
 190         int     i;
 191
 192         if (free_tx_pages <= 0) {       /* Do timeouts, to avoid hangs. */
 193                 tickssofar = jiffies - dev->trans_start;
 194                 if (tickssofar < 5)
 195                         return 1;
 196                 /* else */
 197                 printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
 198                 /* Restart the adapter. */
 199                 spin_lock_irqsave(&de600_lock, flags);
 200                 if (adapter_init(dev)) {
 201                         spin_unlock_irqrestore(&de600_lock, flags);
 202                         return 1;
 203                 }
 204                 spin_unlock_irqrestore(&de600_lock, flags);
 205         }
 206
 207         /* Start real output */
 208         PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
 209
 210         if ((len = skb->len) < RUNT)
 211                 len = RUNT;
 212
 213         spin_lock_irqsave(&de600_lock, flags);
 214         select_nic();
 215         tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
 216         tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
 217
 218         if(check_lost)
 219         {
 220                 /* This costs about 40 instructions per packet... */
 221                 de600_setup_address(NODE_ADDRESS, RW_ADDR);
 222                 de600_read_byte(READ_DATA, dev);
 223                 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
 224                         if (adapter_init(dev)) {
 225                                 spin_unlock_irqrestore(&de600_lock, flags);
 226                                 return 1;
 227                         }
 228                 }
 229         }
 230
 231         de600_setup_address(transmit_from, RW_ADDR);
 232         for (i = 0;  i < skb->len ; ++i, ++buffer)
 233                 de600_put_byte(*buffer);
 234         for (; i < len; ++i)
 235                 de600_put_byte(0);
 236
 237         if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
 238                 dev->trans_start = jiffies;
 239                 netif_start_queue(dev); /* allow more packets into adapter */
 240                 /* Send page and generate a faked interrupt */
 241                 de600_setup_address(transmit_from, TX_ADDR);
 242                 de600_put_command(TX_ENABLE);
 243         }
 244         else {
 245                 if (free_tx_pages)
 246                         netif_start_queue(dev);
 247                 else
 248                         netif_stop_queue(dev);
 249                 select_prn();
 250         }
 251         spin_unlock_irqrestore(&de600_lock, flags);
 252         dev_kfree_skb(skb);
 253         return 0;
 254 }
 255
 256 /*
 257  * The typical workload of the driver:
 258  * Handle the network interface interrupts.
 259  */
 260
 261 static irqreturn_t de600_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 262 {
 263         struct net_device       *dev = dev_id;
 264         u8              irq_status;
 265         int             retrig = 0;
 266         int             boguscount = 0;
 267
 268         /* This might just as well be deleted now, no crummy drivers present :-) */
 269         if ((dev == NULL) || (DE600_IRQ != irq)) {
 270                 printk(KERN_ERR "%s: bogus interrupt %d\n", dev?dev->name:"DE-600", irq);
 271                 return IRQ_NONE;
 272         }
 273
 274         spin_lock(&de600_lock);
 275
 276         select_nic();
 277         irq_status = de600_read_status(dev);
 278
 279         do {
 280                 PRINTK(("de600_interrupt (%02X)\n", irq_status));
 281
 282                 if (irq_status & RX_GOOD)
 283                         de600_rx_intr(dev);
 284                 else if (!(irq_status & RX_BUSY))
 285                         de600_put_command(RX_ENABLE);
 286
 287                 /* Any transmission in progress? */
 288                 if (free_tx_pages < TX_PAGES)
 289                         retrig = de600_tx_intr(dev, irq_status);
 290                 else
 291                         retrig = 0;
 292
 293                 irq_status = de600_read_status(dev);
 294         } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
 295         /*
 296          * Yeah, it _looks_ like busy waiting, smells like busy waiting
 297          * and I know it's not PC, but please, it will only occur once
 298          * in a while and then only for a loop or so (< 1ms for sure!)
 299          */
 300
 301         /* Enable adapter interrupts */
 302         select_prn();
 303         if (retrig)
 304                 trigger_interrupt(dev);
 305         spin_unlock(&de600_lock);
 306         return IRQ_HANDLED;
 307 }
 308
 309 static int de600_tx_intr(struct net_device *dev, int irq_status)
 310 {
 311         /*
 312          * Returns 1 if tx still not done
 313          */
 314
 315         /* Check if current transmission is done yet */
 316         if (irq_status & TX_BUSY)
 317                 return 1; /* tx not done, try again */
 318
 319         /* else */
 320         /* If last transmission OK then bump fifo index */
 321         if (!(irq_status & TX_FAILED16)) {
 322                 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
 323                 ++free_tx_pages;
 324                 ((struct net_device_stats *)(dev->priv))->tx_packets++;
 325                 netif_wake_queue(dev);
 326         }
 327
 328         /* More to send, or resend last packet? */
 329         if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
 330                 dev->trans_start = jiffies;
 331                 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
 332                 de600_put_command(TX_ENABLE);
 333                 return 1;
 334         }
 335         /* else */
 336
 337         return 0;
 338 }
 339
 340 /*
 341  * We have a good packet, get it out of the adapter.
 342  */
 343 static void de600_rx_intr(struct net_device *dev)
 344 {
 345         struct sk_buff  *skb;
 346         int             i;
 347         int             read_from;
 348         int             size;
 349         unsigned char   *buffer;
 350
 351         /* Get size of received packet */
 352         size = de600_read_byte(RX_LEN, dev);    /* low byte */
 353         size += (de600_read_byte(RX_LEN, dev) << 8);    /* high byte */
 354         size -= 4;      /* Ignore trailing 4 CRC-bytes */
 355
 356         /* Tell adapter where to store next incoming packet, enable receiver */
 357         read_from = rx_page_adr();
 358         next_rx_page();
 359         de600_put_command(RX_ENABLE);
 360
 361         if ((size < 32)  ||  (size > 1535)) {
 362                 printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
 363                 if (size > 10000)
 364                         adapter_init(dev);
 365                 return;
 366         }
 367
 368         skb = dev_alloc_skb(size+2);
 369         if (skb == NULL) {
 370                 printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
 371                 return;
 372         }
 373         /* else */
 374
 375         skb->dev = dev;
 376         skb_reserve(skb,2);     /* Align */
 377
 378         /* 'skb->data' points to the start of sk_buff data area. */
 379         buffer = skb_put(skb,size);
 380
 381         /* copy the packet into the buffer */
 382         de600_setup_address(read_from, RW_ADDR);
 383         for (i = size; i > 0; --i, ++buffer)
 384                 *buffer = de600_read_byte(READ_DATA, dev);
 385
 386         skb->protocol=eth_type_trans(skb,dev);
 387
 388         netif_rx(skb);
 389
 390         /* update stats */
 391         dev->last_rx = jiffies;
 392         ((struct net_device_stats *)(dev->priv))->rx_packets++; /* count all receives */
 393         ((struct net_device_stats *)(dev->priv))->rx_bytes += size; /* count all received bytes */
 394
 395         /*
 396          * If any worth-while packets have been received, netif_rx()
 397          * will work on them when we get to the tasklets.
 398          */
 399 }
 400
 401 static struct net_device * __init de600_probe(void)
 402 {
 403         int     i;
 404         struct net_device *dev;
 405         int err;
 406
 407         dev = alloc_etherdev(sizeof(struct net_device_stats));
 408         if (!dev)
 409                 return ERR_PTR(-ENOMEM);
 410
 411         SET_MODULE_OWNER(dev);
 412
 413         if (!request_region(DE600_IO, 3, "de600")) {
 414                 printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
 415                 err = -EBUSY;
 416                 goto out;
 417         }
 418
 419         printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
 420         /* Alpha testers must have the version number to report bugs. */
 421         if (de600_debug > 1)
 422                 printk(version);
 423
 424         /* probe for adapter */
 425         err = -ENODEV;
 426         rx_page = 0;
 427         select_nic();
 428         (void)de600_read_status(dev);
 429         de600_put_command(RESET);
 430         de600_put_command(STOP_RESET);
 431         if (de600_read_status(dev) & 0xf0) {
 432                 printk(": not at I/O %#3x.\n", DATA_PORT);
 433                 goto out1;
 434         }
 435
 436         /*
 437          * Maybe we found one,
 438          * have to check if it is a D-Link DE-600 adapter...
 439          */
 440
 441         /* Get the adapter ethernet address from the ROM */
 442         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 443         for (i = 0; i < ETH_ALEN; i++) {
 444                 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
 445                 dev->broadcast[i] = 0xff;
 446         }
 447
 448         /* Check magic code */
 449         if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
 450                 /* OK, install real address */
 451                 dev->dev_addr[0] = 0x00;
 452                 dev->dev_addr[1] = 0x80;
 453                 dev->dev_addr[2] = 0xc8;
 454                 dev->dev_addr[3] &= 0x0f;
 455                 dev->dev_addr[3] |= 0x70;
 456         } else {
 457                 printk(" not identified in the printer port\n");
 458                 goto out1;
 459         }
 460
 461         printk(", Ethernet Address: %02X", dev->dev_addr[0]);
 462         for (i = 1; i < ETH_ALEN; i++)
 463                 printk(":%02X",dev->dev_addr[i]);
 464         printk("\n");
 465
 466         dev->get_stats = get_stats;
 467
 468         dev->open = de600_open;
 469         dev->stop = de600_close;
 470         dev->hard_start_xmit = &de600_start_xmit;
 471
 472         dev->flags&=~IFF_MULTICAST;
 473
 474         select_prn();
 475
 476         err = register_netdev(dev);
 477         if (err)
 478                 goto out1;
 479
 480         return dev;
 481
 482 out1:
 483         release_region(DE600_IO, 3);
 484 out:
 485         free_netdev(dev);
 486         return ERR_PTR(err);
 487 }
 488
 489 static int adapter_init(struct net_device *dev)
 490 {
 491         int     i;
 492
 493         select_nic();
 494         rx_page = 0; /* used by RESET */
 495         de600_put_command(RESET);
 496         de600_put_command(STOP_RESET);
 497
 498         /* Check if it is still there... */
 499         /* Get the some bytes of the adapter ethernet address from the ROM */
 500         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 501         de600_read_byte(READ_DATA, dev);
 502         if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
 503             (de600_read_byte(READ_DATA, dev) != 0x15)) {
 504         /* was: if (de600_read_status(dev) & 0xf0) { */
 505                 printk("Something has happened to the DE-600!  Please check it and do a new ifconfig!\n");
 506                 /* Goodbye, cruel world... */
 507                 dev->flags &= ~IFF_UP;
 508                 de600_close(dev);
 509                 was_down = 1;
 510                 netif_stop_queue(dev); /* Transmit busy...  */
 511                 return 1; /* failed */
 512         }
 513
 514         if (was_down) {
 515                 printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
 516                 was_down = 0;
 517         }
 518
 519         tx_fifo_in = 0;
 520         tx_fifo_out = 0;
 521         free_tx_pages = TX_PAGES;
 522
 523
 524         /* set the ether address. */
 525         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 526         for (i = 0; i < ETH_ALEN; i++)
 527                 de600_put_byte(dev->dev_addr[i]);
 528
 529         /* where to start saving incoming packets */
 530         rx_page = RX_BP | RX_BASE_PAGE;
 531         de600_setup_address(MEM_4K, RW_ADDR);
 532         /* Enable receiver */
 533         de600_put_command(RX_ENABLE);
 534         select_prn();
 535
 536         netif_start_queue(dev);
 537
 538         return 0; /* OK */
 539 }
 540
 541 static struct net_device *de600_dev;
 542
 543 static int __init de600_init(void)
 544 {
 545         de600_dev = de600_probe();
 546         if (IS_ERR(de600_dev))
 547                 return PTR_ERR(de600_dev);
 548         return 0;
 549 }
 550
 551 static void __exit de600_exit(void)
 552 {
 553         unregister_netdev(de600_dev);
 554         release_region(DE600_IO, 3);
 555         free_netdev(de600_dev);
 556 }
 557
 558 module_init(de600_init);
 559 module_exit(de600_exit);
 560
 561 MODULE_LICENSE("GPL");