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 inline void trigger_interrupt(struct net_device *dev)
 158 {
 159         de600_put_command(FLIP_IRQ);
 160         select_prn();
 161         DE600_SLOW_DOWN;
 162         select_nic();
 163         de600_put_command(0);
 164 }
 165
 166 /*
 167  * Copy a buffer to the adapter transmit page memory.
 168  * Start sending.
 169  */
 170
 171 static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
 172 {
 173         unsigned long flags;
 174         int     transmit_from;
 175         int     len;
 176         int     tickssofar;
 177         u8      *buffer = skb->data;
 178         int     i;
 179
 180         if (free_tx_pages <= 0) {       /* Do timeouts, to avoid hangs. */
 181                 tickssofar = jiffies - dev->trans_start;
 182                 if (tickssofar < 5)
 183                         return 1;
 184                 /* else */
 185                 printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
 186                 /* Restart the adapter. */
 187                 spin_lock_irqsave(&de600_lock, flags);
 188                 if (adapter_init(dev)) {
 189                         spin_unlock_irqrestore(&de600_lock, flags);
 190                         return 1;
 191                 }
 192                 spin_unlock_irqrestore(&de600_lock, flags);
 193         }
 194
 195         /* Start real output */
 196         PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
 197
 198         if ((len = skb->len) < RUNT)
 199                 len = RUNT;
 200
 201         spin_lock_irqsave(&de600_lock, flags);
 202         select_nic();
 203         tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
 204         tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
 205
 206         if(check_lost)
 207         {
 208                 /* This costs about 40 instructions per packet... */
 209                 de600_setup_address(NODE_ADDRESS, RW_ADDR);
 210                 de600_read_byte(READ_DATA, dev);
 211                 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
 212                         if (adapter_init(dev)) {
 213                                 spin_unlock_irqrestore(&de600_lock, flags);
 214                                 return 1;
 215                         }
 216                 }
 217         }
 218
 219         de600_setup_address(transmit_from, RW_ADDR);
 220         for (i = 0;  i < skb->len ; ++i, ++buffer)
 221                 de600_put_byte(*buffer);
 222         for (; i < len; ++i)
 223                 de600_put_byte(0);
 224
 225         if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
 226                 dev->trans_start = jiffies;
 227                 netif_start_queue(dev); /* allow more packets into adapter */
 228                 /* Send page and generate a faked interrupt */
 229                 de600_setup_address(transmit_from, TX_ADDR);
 230                 de600_put_command(TX_ENABLE);
 231         }
 232         else {
 233                 if (free_tx_pages)
 234                         netif_start_queue(dev);
 235                 else
 236                         netif_stop_queue(dev);
 237                 select_prn();
 238         }
 239         spin_unlock_irqrestore(&de600_lock, flags);
 240         dev_kfree_skb(skb);
 241         return 0;
 242 }
 243
 244 /*
 245  * The typical workload of the driver:
 246  * Handle the network interface interrupts.
 247  */
 248
 249 static irqreturn_t de600_interrupt(int irq, void *dev_id)
 250 {
 251         struct net_device       *dev = dev_id;
 252         u8              irq_status;
 253         int             retrig = 0;
 254         int             boguscount = 0;
 255
 256         spin_lock(&de600_lock);
 257
 258         select_nic();
 259         irq_status = de600_read_status(dev);
 260
 261         do {
 262                 PRINTK(("de600_interrupt (%02X)\n", irq_status));
 263
 264                 if (irq_status & RX_GOOD)
 265                         de600_rx_intr(dev);
 266                 else if (!(irq_status & RX_BUSY))
 267                         de600_put_command(RX_ENABLE);
 268
 269                 /* Any transmission in progress? */
 270                 if (free_tx_pages < TX_PAGES)
 271                         retrig = de600_tx_intr(dev, irq_status);
 272                 else
 273                         retrig = 0;
 274
 275                 irq_status = de600_read_status(dev);
 276         } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
 277         /*
 278          * Yeah, it _looks_ like busy waiting, smells like busy waiting
 279          * and I know it's not PC, but please, it will only occur once
 280          * in a while and then only for a loop or so (< 1ms for sure!)
 281          */
 282
 283         /* Enable adapter interrupts */
 284         select_prn();
 285         if (retrig)
 286                 trigger_interrupt(dev);
 287         spin_unlock(&de600_lock);
 288         return IRQ_HANDLED;
 289 }
 290
 291 static int de600_tx_intr(struct net_device *dev, int irq_status)
 292 {
 293         /*
 294          * Returns 1 if tx still not done
 295          */
 296
 297         /* Check if current transmission is done yet */
 298         if (irq_status & TX_BUSY)
 299                 return 1; /* tx not done, try again */
 300
 301         /* else */
 302         /* If last transmission OK then bump fifo index */
 303         if (!(irq_status & TX_FAILED16)) {
 304                 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
 305                 ++free_tx_pages;
 306                 dev->stats.tx_packets++;
 307                 netif_wake_queue(dev);
 308         }
 309
 310         /* More to send, or resend last packet? */
 311         if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
 312                 dev->trans_start = jiffies;
 313                 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
 314                 de600_put_command(TX_ENABLE);
 315                 return 1;
 316         }
 317         /* else */
 318
 319         return 0;
 320 }
 321
 322 /*
 323  * We have a good packet, get it out of the adapter.
 324  */
 325 static void de600_rx_intr(struct net_device *dev)
 326 {
 327         struct sk_buff  *skb;
 328         int             i;
 329         int             read_from;
 330         int             size;
 331         unsigned char   *buffer;
 332
 333         /* Get size of received packet */
 334         size = de600_read_byte(RX_LEN, dev);    /* low byte */
 335         size += (de600_read_byte(RX_LEN, dev) << 8);    /* high byte */
 336         size -= 4;      /* Ignore trailing 4 CRC-bytes */
 337
 338         /* Tell adapter where to store next incoming packet, enable receiver */
 339         read_from = rx_page_adr();
 340         next_rx_page();
 341         de600_put_command(RX_ENABLE);
 342
 343         if ((size < 32)  ||  (size > 1535)) {
 344                 printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
 345                 if (size > 10000)
 346                         adapter_init(dev);
 347                 return;
 348         }
 349
 350         skb = dev_alloc_skb(size+2);
 351         if (skb == NULL) {
 352                 printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
 353                 return;
 354         }
 355         /* else */
 356
 357         skb_reserve(skb,2);     /* Align */
 358
 359         /* 'skb->data' points to the start of sk_buff data area. */
 360         buffer = skb_put(skb,size);
 361
 362         /* copy the packet into the buffer */
 363         de600_setup_address(read_from, RW_ADDR);
 364         for (i = size; i > 0; --i, ++buffer)
 365                 *buffer = de600_read_byte(READ_DATA, dev);
 366
 367         skb->protocol=eth_type_trans(skb,dev);
 368
 369         netif_rx(skb);
 370
 371         /* update stats */
 372         dev->last_rx = jiffies;
 373         dev->stats.rx_packets++; /* count all receives */
 374         dev->stats.rx_bytes += size; /* count all received bytes */
 375
 376         /*
 377          * If any worth-while packets have been received, netif_rx()
 378          * will work on them when we get to the tasklets.
 379          */
 380 }
 381
 382 static struct net_device * __init de600_probe(void)
 383 {
 384         int     i;
 385         struct net_device *dev;
 386         int err;
 387         DECLARE_MAC_BUF(mac);
 388
 389         dev = alloc_etherdev(0);
 390         if (!dev)
 391                 return ERR_PTR(-ENOMEM);
 392
 393
 394         if (!request_region(DE600_IO, 3, "de600")) {
 395                 printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
 396                 err = -EBUSY;
 397                 goto out;
 398         }
 399
 400         printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
 401         /* Alpha testers must have the version number to report bugs. */
 402         if (de600_debug > 1)
 403                 printk(version);
 404
 405         /* probe for adapter */
 406         err = -ENODEV;
 407         rx_page = 0;
 408         select_nic();
 409         (void)de600_read_status(dev);
 410         de600_put_command(RESET);
 411         de600_put_command(STOP_RESET);
 412         if (de600_read_status(dev) & 0xf0) {
 413                 printk(": not at I/O %#3x.\n", DATA_PORT);
 414                 goto out1;
 415         }
 416
 417         /*
 418          * Maybe we found one,
 419          * have to check if it is a D-Link DE-600 adapter...
 420          */
 421
 422         /* Get the adapter ethernet address from the ROM */
 423         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 424         for (i = 0; i < ETH_ALEN; i++) {
 425                 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
 426                 dev->broadcast[i] = 0xff;
 427         }
 428
 429         /* Check magic code */
 430         if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
 431                 /* OK, install real address */
 432                 dev->dev_addr[0] = 0x00;
 433                 dev->dev_addr[1] = 0x80;
 434                 dev->dev_addr[2] = 0xc8;
 435                 dev->dev_addr[3] &= 0x0f;
 436                 dev->dev_addr[3] |= 0x70;
 437         } else {
 438                 printk(" not identified in the printer port\n");
 439                 goto out1;
 440         }
 441
 442         printk(", Ethernet Address: %s\n", print_mac(mac, dev->dev_addr));
 443
 444         dev->open = de600_open;
 445         dev->stop = de600_close;
 446         dev->hard_start_xmit = &de600_start_xmit;
 447
 448         dev->flags&=~IFF_MULTICAST;
 449
 450         select_prn();
 451
 452         err = register_netdev(dev);
 453         if (err)
 454                 goto out1;
 455
 456         return dev;
 457
 458 out1:
 459         release_region(DE600_IO, 3);
 460 out:
 461         free_netdev(dev);
 462         return ERR_PTR(err);
 463 }
 464
 465 static int adapter_init(struct net_device *dev)
 466 {
 467         int     i;
 468
 469         select_nic();
 470         rx_page = 0; /* used by RESET */
 471         de600_put_command(RESET);
 472         de600_put_command(STOP_RESET);
 473
 474         /* Check if it is still there... */
 475         /* Get the some bytes of the adapter ethernet address from the ROM */
 476         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 477         de600_read_byte(READ_DATA, dev);
 478         if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
 479             (de600_read_byte(READ_DATA, dev) != 0x15)) {
 480         /* was: if (de600_read_status(dev) & 0xf0) { */
 481                 printk("Something has happened to the DE-600!  Please check it and do a new ifconfig!\n");
 482                 /* Goodbye, cruel world... */
 483                 dev->flags &= ~IFF_UP;
 484                 de600_close(dev);
 485                 was_down = 1;
 486                 netif_stop_queue(dev); /* Transmit busy...  */
 487                 return 1; /* failed */
 488         }
 489
 490         if (was_down) {
 491                 printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
 492                 was_down = 0;
 493         }
 494
 495         tx_fifo_in = 0;
 496         tx_fifo_out = 0;
 497         free_tx_pages = TX_PAGES;
 498
 499
 500         /* set the ether address. */
 501         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 502         for (i = 0; i < ETH_ALEN; i++)
 503                 de600_put_byte(dev->dev_addr[i]);
 504
 505         /* where to start saving incoming packets */
 506         rx_page = RX_BP | RX_BASE_PAGE;
 507         de600_setup_address(MEM_4K, RW_ADDR);
 508         /* Enable receiver */
 509         de600_put_command(RX_ENABLE);
 510         select_prn();
 511
 512         netif_start_queue(dev);
 513
 514         return 0; /* OK */
 515 }
 516
 517 static struct net_device *de600_dev;
 518
 519 static int __init de600_init(void)
 520 {
 521         de600_dev = de600_probe();
 522         if (IS_ERR(de600_dev))
 523                 return PTR_ERR(de600_dev);
 524         return 0;
 525 }
 526
 527 static void __exit de600_exit(void)
 528 {
 529         unregister_netdev(de600_dev);
 530         release_region(DE600_IO, 3);
 531         free_netdev(de600_dev);
 532 }
 533
 534 module_init(de600_init);
 535 module_exit(de600_exit);
 536
 537 MODULE_LICENSE("GPL");