1/* 2 * de620.c $Revision: 1.40 $ BETA 3 * 4 * 5 * Linux driver for the D-Link DE-620 Ethernet pocket adapter. 6 * 7 * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall <bj0rn@blox.se> 8 * 9 * Based on adapter information gathered from DOS packetdriver 10 * sources from D-Link Inc: (Special thanks to Henry Ngai of D-Link.) 11 * Portions (C) Copyright D-Link SYSTEM Inc. 1991, 1992 12 * Copyright, 1988, Russell Nelson, Crynwr Software 13 * 14 * Adapted to the sample network driver core for linux, 15 * written by: Donald Becker <becker@super.org> 16 * (Now at <becker@scyld.com>) 17 * 18 * Valuable assistance from: 19 * J. Joshua Kopper <kopper@rtsg.mot.com> 20 * Olav Kvittem <Olav.Kvittem@uninett.no> 21 * Germano Caronni <caronni@nessie.cs.id.ethz.ch> 22 * Jeremy Fitzhardinge <jeremy@suite.sw.oz.au> 23 * 24 *****************************************************************************/ 25/* 26 * This program is free software; you can redistribute it and/or modify 27 * it under the terms of the GNU General Public License as published by 28 * the Free Software Foundation; either version 2, or (at your option) 29 * any later version. 30 * 31 * This program is distributed in the hope that it will be useful, 32 * but WITHOUT ANY WARRANTY; without even the implied warranty of 33 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 34 * GNU General Public License for more details. 35 * 36 * You should have received a copy of the GNU General Public License 37 * along with this program; if not, write to the Free Software 38 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 39 * 40 *****************************************************************************/ 41static const char version[] = 42 "de620.c: $Revision: 1.40 $, Bjorn Ekwall <bj0rn@blox.se>\n"; 43 44/*********************************************************************** 45 * 46 * "Tuning" section. 47 * 48 * Compile-time options: (see below for descriptions) 49 * -DDE620_IO=0x378 (lpt1) 50 * -DDE620_IRQ=7 (lpt1) 51 * -DSHUTDOWN_WHEN_LOST 52 * -DCOUNT_LOOPS 53 * -DLOWSPEED 54 * -DREAD_DELAY 55 * -DWRITE_DELAY 56 */ 57 58/* 59 * This driver assumes that the printer port is a "normal", 60 * dumb, uni-directional port! 61 * If your port is "fancy" in any way, please try to set it to "normal" 62 * with your BIOS setup. I have no access to machines with bi-directional 63 * ports, so I can't test such a driver :-( 64 * (Yes, I _know_ it is possible to use DE620 with bidirectional ports...) 65 * 66 * There are some clones of DE620 out there, with different names. 67 * If the current driver does not recognize a clone, try to change 68 * the following #define to: 69 * 70 * #define DE620_CLONE 1 71 */ 72#define DE620_CLONE 0 73 74/* 75 * If the adapter has problems with high speeds, enable this #define 76 * otherwise full printerport speed will be attempted. 77 * 78 * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED 79 * 80#define LOWSPEED 81 */ 82 83#ifndef READ_DELAY 84#define READ_DELAY 100 /* adapter internal read delay in 100ns units */ 85#endif 86 87#ifndef WRITE_DELAY 88#define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */ 89#endif 90 91/* 92 * Enable this #define if you want the adapter to do a "ifconfig down" on 93 * itself when we have detected that something is possibly wrong with it. 94 * The default behaviour is to retry with "adapter_init()" until success. 95 * This should be used for debugging purposes only. 96 * 97#define SHUTDOWN_WHEN_LOST 98 */ 99 100#ifdef LOWSPEED 101/* 102 * Enable this #define if you want to see debugging output that show how long 103 * we have to wait before the DE-620 is ready for the next read/write/command. 104 * 105#define COUNT_LOOPS 106 */ 107#endif 108 109#include <linux/module.h> 110#include <linux/kernel.h> 111#include <linux/types.h> 112#include <linux/fcntl.h> 113#include <linux/string.h> 114#include <linux/interrupt.h> 115#include <linux/ioport.h> 116#include <linux/in.h> 117#include <linux/errno.h> 118#include <linux/init.h> 119#include <linux/inet.h> 120#include <linux/netdevice.h> 121#include <linux/etherdevice.h> 122#include <linux/skbuff.h> 123 124#include <asm/io.h> 125#include <asm/system.h> 126 127/* Constant definitions for the DE-620 registers, commands and bits */ 128#include "de620.h" 129 130typedef unsigned char byte; 131 132/******************************************************* 133 * * 134 * Definition of D-Link DE-620 Ethernet Pocket adapter * 135 * See also "de620.h" * 136 * * 137 *******************************************************/ 138#ifndef DE620_IO /* Compile-time configurable */ 139#define DE620_IO 0x378 140#endif 141 142#ifndef DE620_IRQ /* Compile-time configurable */ 143#define DE620_IRQ 7 144#endif 145 146#define DATA_PORT (dev->base_addr) 147#define STATUS_PORT (dev->base_addr + 1) 148#define COMMAND_PORT (dev->base_addr + 2) 149 150#define RUNT 60 /* Too small Ethernet packet */ 151#define GIANT 1514 /* largest legal size packet, no fcs */ 152 153/* 154 * Force media with insmod: 155 * insmod de620.o bnc=1 156 * or 157 * insmod de620.o utp=1 158 * 159 * Force io and/or irq with insmod: 160 * insmod de620.o io=0x378 irq=7 161 * 162 * Make a clone skip the Ethernet-address range check: 163 * insmod de620.o clone=1 164 */ 165static int bnc; 166static int utp; 167static int io = DE620_IO; 168static int irq = DE620_IRQ; 169static int clone = DE620_CLONE; 170 171static spinlock_t de620_lock; 172 173module_param(bnc, int, 0); 174module_param(utp, int, 0); 175module_param(io, int, 0); 176module_param(irq, int, 0); 177module_param(clone, int, 0); 178MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)"); 179MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)"); 180MODULE_PARM_DESC(io, "DE-620 I/O base address,required"); 181MODULE_PARM_DESC(irq, "DE-620 IRQ number,required"); 182MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)"); 183 184/*********************************************** 185 * * 186 * Index to functions, as function prototypes. * 187 * * 188 ***********************************************/ 189 190/* 191 * Routines used internally. (See also "convenience macros.. below") 192 */ 193 194/* Put in the device structure. */ 195static int de620_open(struct net_device *); 196static int de620_close(struct net_device *); 197static void de620_set_multicast_list(struct net_device *); 198static int de620_start_xmit(struct sk_buff *, struct net_device *); 199 200/* Dispatch from interrupts. */ 201static irqreturn_t de620_interrupt(int, void *); 202static int de620_rx_intr(struct net_device *); 203 204/* Initialization */ 205static int adapter_init(struct net_device *); 206static int read_eeprom(struct net_device *); 207 208 209/* 210 * D-Link driver variables: 211 */ 212#define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX 213#define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */ 214#define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */ 215#define DEF_NIC_CMD IRQEN | ICEN | DS1 216 217static volatile byte NIC_Cmd; 218static volatile byte next_rx_page; 219static byte first_rx_page; 220static byte last_rx_page; 221static byte EIPRegister; 222 223static struct nic { 224 byte NodeID[6]; 225 byte RAM_Size; 226 byte Model; 227 byte Media; 228 byte SCR; 229} nic_data; 230 231/********************************************************** 232 * * 233 * Convenience macros/functions for D-Link DE-620 adapter * 234 * * 235 **********************************************************/ 236#define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1)) 237#define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT); 238 239/* Check for ready-status, and return a nibble (high 4 bits) for data input */ 240#ifdef COUNT_LOOPS 241static int tot_cnt; 242#endif 243static inline byte 244de620_ready(struct net_device *dev) 245{ 246 byte value; 247 register short int cnt = 0; 248 249 while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000)) 250 ++cnt; 251 252#ifdef COUNT_LOOPS 253 tot_cnt += cnt; 254#endif 255 return value & 0xf0; /* nibble */ 256} 257 258static inline void 259de620_send_command(struct net_device *dev, byte cmd) 260{ 261 de620_ready(dev); 262 if (cmd == W_DUMMY) 263 outb(NIC_Cmd, COMMAND_PORT); 264 265 outb(cmd, DATA_PORT); 266 267 outb(NIC_Cmd ^ CS0, COMMAND_PORT); 268 de620_ready(dev); 269 outb(NIC_Cmd, COMMAND_PORT); 270} 271 272static inline void 273de620_put_byte(struct net_device *dev, byte value) 274{ 275 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */ 276 de620_ready(dev); 277 outb(value, DATA_PORT); 278 de620_flip_ds(dev); 279} 280 281static inline byte 282de620_read_byte(struct net_device *dev) 283{ 284 byte value; 285 286 /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */ 287 value = de620_ready(dev); /* High nibble */ 288 de620_flip_ds(dev); 289 value |= de620_ready(dev) >> 4; /* Low nibble */ 290 return value; 291} 292 293static inline void 294de620_write_block(struct net_device *dev, byte *buffer, int count, int pad) 295{ 296#ifndef LOWSPEED 297 byte uflip = NIC_Cmd ^ (DS0 | DS1); 298 byte dflip = NIC_Cmd; 299#else /* LOWSPEED */ 300#ifdef COUNT_LOOPS 301 int bytes = count; 302#endif /* COUNT_LOOPS */ 303#endif /* LOWSPEED */ 304 305#ifdef LOWSPEED 306#ifdef COUNT_LOOPS 307 tot_cnt = 0; 308#endif /* COUNT_LOOPS */ 309 /* No further optimization useful, the limit is in the adapter. */ 310 for ( ; count > 0; --count, ++buffer) { 311 de620_put_byte(dev,*buffer); 312 } 313 for ( count = pad ; count > 0; --count, ++buffer) { 314 de620_put_byte(dev, 0); 315 } 316 de620_send_command(dev,W_DUMMY); 317#ifdef COUNT_LOOPS 318 /* trial debug output: loops per byte in de620_ready() */ 319 printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1))); 320#endif /* COUNT_LOOPS */ 321#else /* not LOWSPEED */ 322 for ( ; count > 0; count -=2) { 323 outb(*buffer++, DATA_PORT); 324 outb(uflip, COMMAND_PORT); 325 outb(*buffer++, DATA_PORT); 326 outb(dflip, COMMAND_PORT); 327 } 328 de620_send_command(dev,W_DUMMY); 329#endif /* LOWSPEED */ 330} 331 332static inline void 333de620_read_block(struct net_device *dev, byte *data, int count) 334{ 335#ifndef LOWSPEED 336 byte value; 337 byte uflip = NIC_Cmd ^ (DS0 | DS1); 338 byte dflip = NIC_Cmd; 339#else /* LOWSPEED */ 340#ifdef COUNT_LOOPS 341 int bytes = count; 342 343 tot_cnt = 0; 344#endif /* COUNT_LOOPS */ 345#endif /* LOWSPEED */ 346 347#ifdef LOWSPEED 348 /* No further optimization useful, the limit is in the adapter. */ 349 while (count-- > 0) { 350 *data++ = de620_read_byte(dev); 351 de620_flip_ds(dev); 352 } 353#ifdef COUNT_LOOPS 354 /* trial debug output: loops per byte in de620_ready() */ 355 printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1))); 356#endif /* COUNT_LOOPS */ 357#else /* not LOWSPEED */ 358 while (count-- > 0) { 359 value = inb(STATUS_PORT) & 0xf0; /* High nibble */ 360 outb(uflip, COMMAND_PORT); 361 *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */ 362 outb(dflip , COMMAND_PORT); 363 } 364#endif /* LOWSPEED */ 365} 366 367static inline void 368de620_set_delay(struct net_device *dev) 369{ 370 de620_ready(dev); 371 outb(W_DFR, DATA_PORT); 372 outb(NIC_Cmd ^ CS0, COMMAND_PORT); 373 374 de620_ready(dev); 375#ifdef LOWSPEED 376 outb(WRITE_DELAY, DATA_PORT); 377#else 378 outb(0, DATA_PORT); 379#endif 380 de620_flip_ds(dev); 381 382 de620_ready(dev); 383#ifdef LOWSPEED 384 outb(READ_DELAY, DATA_PORT); 385#else 386 outb(0, DATA_PORT); 387#endif 388 de620_flip_ds(dev); 389} 390 391static inline void 392de620_set_register(struct net_device *dev, byte reg, byte value) 393{ 394 de620_ready(dev); 395 outb(reg, DATA_PORT); 396 outb(NIC_Cmd ^ CS0, COMMAND_PORT); 397 398 de620_put_byte(dev, value); 399} 400 401static inline byte 402de620_get_register(struct net_device *dev, byte reg) 403{ 404 byte value; 405 406 de620_send_command(dev,reg); 407 value = de620_read_byte(dev); 408 de620_send_command(dev,W_DUMMY); 409 410 return value; 411} 412 413/********************************************************************* 414 * 415 * Open/initialize the board. 416 * 417 * This routine should set everything up anew at each open, even 418 * registers that "should" only need to be set once at boot, so that 419 * there is a non-reboot way to recover if something goes wrong. 420 * 421 */ 422static int de620_open(struct net_device *dev) 423{ 424 int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev); 425 if (ret) { 426 printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq); 427 return ret; 428 } 429 430 if (adapter_init(dev)) { 431 ret = -EIO; 432 goto out_free_irq; 433 } 434 435 netif_start_queue(dev); 436 return 0; 437 438out_free_irq: 439 free_irq(dev->irq, dev); 440 return ret; 441} 442 443/************************************************ 444 * 445 * The inverse routine to de620_open(). 446 * 447 */ 448 449static int de620_close(struct net_device *dev) 450{ 451 netif_stop_queue(dev); 452 /* disable recv */ 453 de620_set_register(dev, W_TCR, RXOFF); 454 free_irq(dev->irq, dev); 455 return 0; 456} 457 458/********************************************* 459 * 460 * Set or clear the multicast filter for this adaptor. 461 * (no real multicast implemented for the DE-620, but she can be promiscuous...) 462 * 463 */ 464 465static void de620_set_multicast_list(struct net_device *dev) 466{ 467 if (!netdev_mc_empty(dev) || dev->flags&(IFF_ALLMULTI|IFF_PROMISC)) 468 { /* Enable promiscuous mode */ 469 de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL); 470 } 471 else 472 { /* Disable promiscuous mode, use normal mode */ 473 de620_set_register(dev, W_TCR, TCR_DEF); 474 } 475} 476 477/******************************************************* 478 * 479 * Handle timeouts on transmit 480 */ 481 482static void de620_timeout(struct net_device *dev) 483{ 484 printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem"); 485 /* Restart the adapter. */ 486 if (!adapter_init(dev)) /* maybe close it */ 487 netif_wake_queue(dev); 488} 489 490/******************************************************* 491 * 492 * Copy a buffer to the adapter transmit page memory. 493 * Start sending. 494 */ 495static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev) 496{ 497 unsigned long flags; 498 int len; 499 byte *buffer = skb->data; 500 byte using_txbuf; 501 502 using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */ 503 504 netif_stop_queue(dev); 505 506 507 if ((len = skb->len) < RUNT) 508 len = RUNT; 509 if (len & 1) /* send an even number of bytes */ 510 ++len; 511 512 /* Start real output */ 513 514 spin_lock_irqsave(&de620_lock, flags); 515 pr_debug("de620_start_xmit: len=%d, bufs 0x%02x\n", 516 (int)skb->len, using_txbuf); 517 518 /* select a free tx buffer. if there is one... */ 519 switch (using_txbuf) { 520 default: /* both are free: use TXBF0 */ 521 case TXBF1: /* use TXBF0 */ 522 de620_send_command(dev,W_CR | RW0); 523 using_txbuf |= TXBF0; 524 break; 525 526 case TXBF0: /* use TXBF1 */ 527 de620_send_command(dev,W_CR | RW1); 528 using_txbuf |= TXBF1; 529 break; 530 531 case (TXBF0 | TXBF1): /* NONE!!! */ 532 printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name); 533 spin_unlock_irqrestore(&de620_lock, flags); 534 return NETDEV_TX_BUSY; 535 } 536 de620_write_block(dev, buffer, skb->len, len-skb->len); 537 538 if(!(using_txbuf == (TXBF0 | TXBF1))) 539 netif_wake_queue(dev); 540 541 dev->stats.tx_packets++; 542 spin_unlock_irqrestore(&de620_lock, flags); 543 dev_kfree_skb (skb); 544 return NETDEV_TX_OK; 545} 546 547/***************************************************** 548 * 549 * Handle the network interface interrupts. 550 * 551 */ 552static irqreturn_t 553de620_interrupt(int irq_in, void *dev_id) 554{ 555 struct net_device *dev = dev_id; 556 byte irq_status; 557 int bogus_count = 0; 558 int again = 0; 559 560 spin_lock(&de620_lock); 561 562 /* Read the status register (_not_ the status port) */ 563 irq_status = de620_get_register(dev, R_STS); 564 565 pr_debug("de620_interrupt (%2.2X)\n", irq_status); 566 567 if (irq_status & RXGOOD) { 568 do { 569 again = de620_rx_intr(dev); 570 pr_debug("again=%d\n", again); 571 } 572 while (again && (++bogus_count < 100)); 573 } 574 575 if(de620_tx_buffs(dev) != (TXBF0 | TXBF1)) 576 netif_wake_queue(dev); 577 578 spin_unlock(&de620_lock); 579 return IRQ_HANDLED; 580} 581 582/************************************** 583 * 584 * Get a packet from the adapter 585 * 586 * Send it "upstairs" 587 * 588 */ 589static int de620_rx_intr(struct net_device *dev) 590{ 591 struct header_buf { 592 byte status; 593 byte Rx_NextPage; 594 unsigned short Rx_ByteCount; 595 } header_buf; 596 struct sk_buff *skb; 597 int size; 598 byte *buffer; 599 byte pagelink; 600 byte curr_page; 601 602 pr_debug("de620_rx_intr: next_rx_page = %d\n", next_rx_page); 603 604 /* Tell the adapter that we are going to read data, and from where */ 605 de620_send_command(dev, W_CR | RRN); 606 de620_set_register(dev, W_RSA1, next_rx_page); 607 de620_set_register(dev, W_RSA0, 0); 608 609 /* Deep breath, and away we goooooo */ 610 de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf)); 611 pr_debug("page status=0x%02x, nextpage=%d, packetsize=%d\n", 612 header_buf.status, header_buf.Rx_NextPage, 613 header_buf.Rx_ByteCount); 614 615 /* Plausible page header? */ 616 pagelink = header_buf.Rx_NextPage; 617 if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) { 618 /* Ouch... Forget it! Skip all and start afresh... */ 619 printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name); 620 /* You win some, you lose some. And sometimes plenty... */ 621 adapter_init(dev); 622 netif_wake_queue(dev); 623 dev->stats.rx_over_errors++; 624 return 0; 625 } 626 627 /* OK, this look good, so far. Let's see if it's consistent... */ 628 /* Let's compute the start of the next packet, based on where we are */ 629 pagelink = next_rx_page + 630 ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8); 631 632 /* Are we going to wrap around the page counter? */ 633 if (pagelink > last_rx_page) 634 pagelink -= (last_rx_page - first_rx_page + 1); 635 636 /* Is the _computed_ next page number equal to what the adapter says? */ 637 if (pagelink != header_buf.Rx_NextPage) { 638 /* Naah, we'll skip this packet. Probably bogus data as well */ 639 printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name); 640 next_rx_page = header_buf.Rx_NextPage; /* at least a try... */ 641 de620_send_command(dev, W_DUMMY); 642 de620_set_register(dev, W_NPRF, next_rx_page); 643 dev->stats.rx_over_errors++; 644 return 0; 645 } 646 next_rx_page = pagelink; 647 648 size = header_buf.Rx_ByteCount - 4; 649 if ((size < RUNT) || (GIANT < size)) { 650 printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size); 651 } 652 else { /* Good packet? */ 653 skb = dev_alloc_skb(size+2); 654 if (skb == NULL) { /* Yeah, but no place to put it... */ 655 printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size); 656 dev->stats.rx_dropped++; 657 } 658 else { /* Yep! Go get it! */ 659 skb_reserve(skb,2); /* Align */ 660 /* skb->data points to the start of sk_buff data area */ 661 buffer = skb_put(skb,size); 662 /* copy the packet into the buffer */ 663 de620_read_block(dev, buffer, size); 664 pr_debug("Read %d bytes\n", size); 665 skb->protocol=eth_type_trans(skb,dev); 666 netif_rx(skb); /* deliver it "upstairs" */ 667 /* count all receives */ 668 dev->stats.rx_packets++; 669 dev->stats.rx_bytes += size; 670 } 671 } 672 673 /* Let's peek ahead to see if we have read the last current packet */ 674 /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */ 675 curr_page = de620_get_register(dev, R_CPR); 676 de620_set_register(dev, W_NPRF, next_rx_page); 677 pr_debug("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page); 678 679 return next_rx_page != curr_page; /* That was slightly tricky... */ 680} 681 682/********************************************* 683 * 684 * Reset the adapter to a known state 685 * 686 */ 687static int adapter_init(struct net_device *dev) 688{ 689 int i; 690 static int was_down; 691 692 if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */ 693 EIPRegister = NCTL0; 694 if (nic_data.Media != 1) 695 EIPRegister |= NIS0; /* not BNC */ 696 } 697 else if (nic_data.Model == 2) { /* UTP */ 698 EIPRegister = NCTL0 | NIS0; 699 } 700 701 if (utp) 702 EIPRegister = NCTL0 | NIS0; 703 if (bnc) 704 EIPRegister = NCTL0; 705 706 de620_send_command(dev, W_CR | RNOP | CLEAR); 707 de620_send_command(dev, W_CR | RNOP); 708 709 de620_set_register(dev, W_SCR, SCR_DEF); 710 /* disable recv to wait init */ 711 de620_set_register(dev, W_TCR, RXOFF); 712 713 /* Set the node ID in the adapter */ 714 for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */ 715 de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]); 716 } 717 718 de620_set_register(dev, W_EIP, EIPRegister); 719 720 next_rx_page = first_rx_page = DE620_RX_START_PAGE; 721 if (nic_data.RAM_Size) 722 last_rx_page = nic_data.RAM_Size - 1; 723 else /* 64k RAM */ 724 last_rx_page = 255; 725 726 de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/ 727 de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */ 728 de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/ 729 de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/ 730 de620_send_command(dev, W_DUMMY); 731 de620_set_delay(dev); 732 733 /* Final sanity check: Anybody out there? */ 734 /* Let's hope some bits from the statusregister make a good check */ 735#define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 ) 736#define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 ) 737 /* success: X 0 0 X 0 0 X X */ 738 /* ignore: EEDI RXGOOD COLS LNKS*/ 739 740 if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) { 741 printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it" 742#ifdef SHUTDOWN_WHEN_LOST 743 " and do a new ifconfig" 744#endif 745 "! (%02x)\n", dev->name, i); 746#ifdef SHUTDOWN_WHEN_LOST 747 /* Goodbye, cruel world... */ 748 dev->flags &= ~IFF_UP; 749 de620_close(dev); 750#endif 751 was_down = 1; 752 return 1; /* failed */ 753 } 754 if (was_down) { 755 printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name); 756 was_down = 0; 757 } 758 759 /* All OK, go ahead... */ 760 de620_set_register(dev, W_TCR, TCR_DEF); 761 762 return 0; /* all ok */ 763} 764 765static const struct net_device_ops de620_netdev_ops = { 766 .ndo_open = de620_open, 767 .ndo_stop = de620_close, 768 .ndo_start_xmit = de620_start_xmit, 769 .ndo_tx_timeout = de620_timeout, 770 .ndo_set_rx_mode = de620_set_multicast_list, 771 .ndo_change_mtu = eth_change_mtu, 772 .ndo_set_mac_address = eth_mac_addr, 773 .ndo_validate_addr = eth_validate_addr, 774}; 775 776/****************************************************************************** 777 * 778 * Only start-up code below 779 * 780 */ 781/**************************************** 782 * 783 * Check if there is a DE-620 connected 784 */ 785struct net_device * __init de620_probe(int unit) 786{ 787 byte checkbyte = 0xa5; 788 struct net_device *dev; 789 int err = -ENOMEM; 790 int i; 791 792 dev = alloc_etherdev(0); 793 if (!dev) 794 goto out; 795 796 spin_lock_init(&de620_lock); 797 798 /* 799 * This is where the base_addr and irq gets set. 800 * Tunable at compile-time and insmod-time 801 */ 802 dev->base_addr = io; 803 dev->irq = irq; 804 805 /* allow overriding parameters on command line */ 806 if (unit >= 0) { 807 sprintf(dev->name, "eth%d", unit); 808 netdev_boot_setup_check(dev); 809 } 810 811 pr_debug("%s", version); 812 813 printk(KERN_INFO "D-Link DE-620 pocket adapter"); 814 815 if (!request_region(dev->base_addr, 3, "de620")) { 816 printk(" io 0x%3lX, which is busy.\n", dev->base_addr); 817 err = -EBUSY; 818 goto out1; 819 } 820 821 /* Initially, configure basic nibble mode, so we can read the EEPROM */ 822 NIC_Cmd = DEF_NIC_CMD; 823 de620_set_register(dev, W_EIP, EIPRegister); 824 825 /* Anybody out there? */ 826 de620_set_register(dev, W_CPR, checkbyte); 827 checkbyte = de620_get_register(dev, R_CPR); 828 829 if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) { 830 printk(" not identified in the printer port\n"); 831 err = -ENODEV; 832 goto out2; 833 } 834 835 /* else, got it! */ 836 dev->dev_addr[0] = nic_data.NodeID[0]; 837 for (i = 1; i < ETH_ALEN; i++) { 838 dev->dev_addr[i] = nic_data.NodeID[i]; 839 dev->broadcast[i] = 0xff; 840 } 841 842 printk(", Ethernet Address: %pM", dev->dev_addr); 843 844 printk(" (%dk RAM,", 845 (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64); 846 847 if (nic_data.Media == 1) 848 printk(" BNC)\n"); 849 else 850 printk(" UTP)\n"); 851 852 dev->netdev_ops = &de620_netdev_ops; 853 dev->watchdog_timeo = HZ*2; 854 855 /* base_addr and irq are already set, see above! */ 856 857 /* dump eeprom */ 858 pr_debug("\nEEPROM contents:\n" 859 "RAM_Size = 0x%02X\n" 860 "NodeID = %pM\n" 861 "Model = %d\n" 862 "Media = %d\n" 863 "SCR = 0x%02x\n", nic_data.RAM_Size, nic_data.NodeID, 864 nic_data.Model, nic_data.Media, nic_data.SCR); 865 866 err = register_netdev(dev); 867 if (err) 868 goto out2; 869 return dev; 870 871out2: 872 release_region(dev->base_addr, 3); 873out1: 874 free_netdev(dev); 875out: 876 return ERR_PTR(err); 877} 878 879/********************************** 880 * 881 * Read info from on-board EEPROM 882 * 883 * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_! 884 */ 885#define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister); 886 887static unsigned short __init ReadAWord(struct net_device *dev, int from) 888{ 889 unsigned short data; 890 int nbits; 891 892 /* cs [__~~] SET SEND STATE */ 893 /* di [____] */ 894 /* sck [_~~_] */ 895 sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4); 896 897 /* Send the 9-bit address from where we want to read the 16-bit word */ 898 for (nbits = 9; nbits > 0; --nbits, from <<= 1) { 899 if (from & 0x0100) { /* bit set? */ 900 /* cs [~~~~] SEND 1 */ 901 /* di [~~~~] */ 902 /* sck [_~~_] */ 903 sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6); 904 } 905 else { 906 /* cs [~~~~] SEND 0 */ 907 /* di [____] */ 908 /* sck [_~~_] */ 909 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4); 910 } 911 } 912 913 /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */ 914 for (data = 0, nbits = 16; nbits > 0; --nbits) { 915 /* cs [~~~~] SEND 0 */ 916 /* di [____] */ 917 /* sck [_~~_] */ 918 sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4); 919 data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7); 920 } 921 /* cs [____] RESET SEND STATE */ 922 /* di [____] */ 923 /* sck [_~~_] */ 924 sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0); 925 926 return data; 927} 928 929static int __init read_eeprom(struct net_device *dev) 930{ 931 unsigned short wrd; 932 933 /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */ 934 wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */ 935 if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */ 936 return -1; /* Nope, not a DE-620 */ 937 nic_data.NodeID[0] = wrd & 0xff; 938 nic_data.NodeID[1] = wrd >> 8; 939 940 wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */ 941 if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */ 942 return -1; /* Nope, not a DE-620 */ 943 nic_data.NodeID[2] = wrd & 0xff; 944 nic_data.NodeID[3] = wrd >> 8; 945 946 wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */ 947 nic_data.NodeID[4] = wrd & 0xff; 948 nic_data.NodeID[5] = wrd >> 8; 949 950 wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */ 951 nic_data.RAM_Size = (wrd >> 8); 952 953 wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */ 954 nic_data.Model = (wrd & 0xff); 955 956 wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */ 957 nic_data.Media = (wrd & 0xff); 958 959 wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */ 960 nic_data.SCR = (wrd >> 8); 961 962 return 0; /* no errors */ 963} 964 965/****************************************************************************** 966 * 967 * Loadable module skeleton 968 * 969 */ 970#ifdef MODULE 971static struct net_device *de620_dev; 972 973int __init init_module(void) 974{ 975 de620_dev = de620_probe(-1); 976 if (IS_ERR(de620_dev)) 977 return PTR_ERR(de620_dev); 978 return 0; 979} 980 981void cleanup_module(void) 982{ 983 unregister_netdev(de620_dev); 984 release_region(de620_dev->base_addr, 3); 985 free_netdev(de620_dev); 986} 987#endif /* MODULE */ 988MODULE_LICENSE("GPL"); 989