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