1 /* cops.c: LocalTalk driver for Linux. 2 * 3 * Authors: 4 * - Jay Schulist <jschlst@samba.org> 5 * 6 * With more than a little help from; 7 * - Alan Cox <Alan.Cox@linux.org> 8 * 9 * Derived from: 10 * - skeleton.c: A network driver outline for linux. 11 * Written 1993-94 by Donald Becker. 12 * - ltpc.c: A driver for the LocalTalk PC card. 13 * Written by Bradford W. Johnson. 14 * 15 * Copyright 1993 United States Government as represented by the 16 * Director, National Security Agency. 17 * 18 * This software may be used and distributed according to the terms 19 * of the GNU General Public License, incorporated herein by reference. 20 * 21 * Changes: 22 * 19970608 Alan Cox Allowed dual card type support 23 * Can set board type in insmod 24 * Hooks for cops_setup routine 25 * (not yet implemented). 26 * 19971101 Jay Schulist Fixes for multiple lt* devices. 27 * 19980607 Steven Hirsch Fixed the badly broken support 28 * for Tangent type cards. Only 29 * tested on Daystar LT200. Some 30 * cleanup of formatting and program 31 * logic. Added emacs 'local-vars' 32 * setup for Jay's brace style. 33 * 20000211 Alan Cox Cleaned up for softnet 34 */ 35 36 static const char *version = 37 "cops.c:v0.04 6/7/98 Jay Schulist <jschlst@samba.org>\n"; 38 /* 39 * Sources: 40 * COPS Localtalk SDK. This provides almost all of the information 41 * needed. 42 */ 43 44 /* 45 * insmod/modprobe configurable stuff. 46 * - IO Port, choose one your card supports or 0 if you dare. 47 * - IRQ, also choose one your card supports or nothing and let 48 * the driver figure it out. 49 */ 50 51 #include <linux/config.h> 52 #include <linux/module.h> 53 #include <linux/kernel.h> 54 #include <linux/types.h> 55 #include <linux/fcntl.h> 56 #include <linux/interrupt.h> 57 #include <linux/ptrace.h> 58 #include <linux/ioport.h> 59 #include <linux/in.h> 60 #include <linux/slab.h> 61 #include <linux/string.h> 62 #include <linux/errno.h> 63 #include <linux/init.h> 64 #include <linux/netdevice.h> 65 #include <linux/etherdevice.h> 66 #include <linux/skbuff.h> 67 #include <linux/if_arp.h> 68 #include <linux/if_ltalk.h> 69 #include <linux/delay.h> /* For udelay() */ 70 #include <linux/atalk.h> 71 #include <linux/spinlock.h> 72 #include <linux/bitops.h> 73 74 #include <asm/system.h> 75 #include <asm/io.h> 76 #include <asm/dma.h> 77 78 #include "cops.h" /* Our Stuff */ 79 #include "cops_ltdrv.h" /* Firmware code for Tangent type cards. */ 80 #include "cops_ffdrv.h" /* Firmware code for Dayna type cards. */ 81 82 /* 83 * The name of the card. Is used for messages and in the requests for 84 * io regions, irqs and dma channels 85 */ 86 87 static const char *cardname = "cops"; 88 89 #ifdef CONFIG_COPS_DAYNA 90 static int board_type = DAYNA; /* Module exported */ 91 #else 92 static int board_type = TANGENT; 93 #endif 94 95 static int io = 0x240; /* Default IO for Dayna */ 96 static int irq = 5; /* Default IRQ */ 97 98 /* 99 * COPS Autoprobe information. 100 * Right now if port address is right but IRQ is not 5 this will 101 * return a 5 no matter what since we will still get a status response. 102 * Need one more additional check to narrow down after we have gotten 103 * the ioaddr. But since only other possible IRQs is 3 and 4 so no real 104 * hurry on this. I *STRONGLY* recommend using IRQ 5 for your card with 105 * this driver. 106 * 107 * This driver has 2 modes and they are: Dayna mode and Tangent mode. 108 * Each mode corresponds with the type of card. It has been found 109 * that there are 2 main types of cards and all other cards are 110 * the same and just have different names or only have minor differences 111 * such as more IO ports. As this driver is tested it will 112 * become more clear on exactly what cards are supported. The driver 113 * defaults to using Dayna mode. To change the drivers mode, simply 114 * select Dayna or Tangent mode when configuring the kernel. 115 * 116 * This driver should support: 117 * TANGENT driver mode: 118 * Tangent ATB-II, Novell NL-1000, Daystar Digital LT-200, 119 * COPS LT-1 120 * DAYNA driver mode: 121 * Dayna DL2000/DaynaTalk PC (Half Length), COPS LT-95, 122 * Farallon PhoneNET PC III, Farallon PhoneNET PC II 123 * Other cards possibly supported mode unkown though: 124 * Dayna DL2000 (Full length), COPS LT/M (Micro-Channel) 125 * 126 * Cards NOT supported by this driver but supported by the ltpc.c 127 * driver written by Bradford W. Johnson <johns393@maroon.tc.umn.edu> 128 * Farallon PhoneNET PC 129 * Original Apple LocalTalk PC card 130 * 131 * N.B. 132 * 133 * The Daystar Digital LT200 boards do not support interrupt-driven 134 * IO. You must specify 'irq=0xff' as a module parameter to invoke 135 * polled mode. I also believe that the port probing logic is quite 136 * dangerous at best and certainly hopeless for a polled card. Best to 137 * specify both. - Steve H. 138 * 139 */ 140 141 /* 142 * Zero terminated list of IO ports to probe. 143 */ 144 145 static unsigned int ports[] = { 146 0x240, 0x340, 0x200, 0x210, 0x220, 0x230, 0x260, 147 0x2A0, 0x300, 0x310, 0x320, 0x330, 0x350, 0x360, 148 0 149 }; 150 151 /* 152 * Zero terminated list of IRQ ports to probe. 153 */ 154 155 static int cops_irqlist[] = { 156 5, 4, 3, 0 157 }; 158 159 static struct timer_list cops_timer; 160 161 /* use 0 for production, 1 for verification, 2 for debug, 3 for verbose debug */ 162 #ifndef COPS_DEBUG 163 #define COPS_DEBUG 1 164 #endif 165 static unsigned int cops_debug = COPS_DEBUG; 166 167 /* The number of low I/O ports used by the card. */ 168 #define COPS_IO_EXTENT 8 169 170 /* Information that needs to be kept for each board. */ 171 172 struct cops_local 173 { 174 struct net_device_stats stats; 175 int board; /* Holds what board type is. */ 176 int nodeid; /* Set to 1 once have nodeid. */ 177 unsigned char node_acquire; /* Node ID when acquired. */ 178 struct atalk_addr node_addr; /* Full node address */ 179 spinlock_t lock; /* RX/TX lock */ 180 }; 181 182 /* Index to functions, as function prototypes. */ 183 static int cops_probe1 (struct net_device *dev, int ioaddr); 184 static int cops_irq (int ioaddr, int board); 185 186 static int cops_open (struct net_device *dev); 187 static int cops_jumpstart (struct net_device *dev); 188 static void cops_reset (struct net_device *dev, int sleep); 189 static void cops_load (struct net_device *dev); 190 static int cops_nodeid (struct net_device *dev, int nodeid); 191 192 static irqreturn_t cops_interrupt (int irq, void *dev_id, struct pt_regs *regs); 193 static void cops_poll (unsigned long ltdev); 194 static void cops_timeout(struct net_device *dev); 195 static void cops_rx (struct net_device *dev); 196 static int cops_send_packet (struct sk_buff *skb, struct net_device *dev); 197 static void set_multicast_list (struct net_device *dev); 198 static int cops_hard_header (struct sk_buff *skb, struct net_device *dev, 199 unsigned short type, void *daddr, void *saddr, 200 unsigned len); 201 202 static int cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd); 203 static int cops_close (struct net_device *dev); 204 static struct net_device_stats *cops_get_stats (struct net_device *dev); 205 206 static void cleanup_card(struct net_device *dev) 207 { 208 if (dev->irq) 209 free_irq(dev->irq, dev); 210 release_region(dev->base_addr, COPS_IO_EXTENT); 211 } 212 213 /* 214 * Check for a network adaptor of this type, and return '0' iff one exists. 215 * If dev->base_addr == 0, probe all likely locations. 216 * If dev->base_addr in [1..0x1ff], always return failure. 217 * otherwise go with what we pass in. 218 */ 219 struct net_device * __init cops_probe(int unit) 220 { 221 struct net_device *dev; 222 unsigned *port; 223 int base_addr; 224 int err = 0; 225 226 dev = alloc_ltalkdev(sizeof(struct cops_local)); 227 if (!dev) 228 return ERR_PTR(-ENOMEM); 229 230 if (unit >= 0) { 231 sprintf(dev->name, "lt%d", unit); 232 netdev_boot_setup_check(dev); 233 irq = dev->irq; 234 base_addr = dev->base_addr; 235 } else { 236 base_addr = dev->base_addr = io; 237 } 238 239 SET_MODULE_OWNER(dev); 240 241 if (base_addr > 0x1ff) { /* Check a single specified location. */ 242 err = cops_probe1(dev, base_addr); 243 } else if (base_addr != 0) { /* Don't probe at all. */ 244 err = -ENXIO; 245 } else { 246 /* FIXME Does this really work for cards which generate irq? 247 * It's definitely N.G. for polled Tangent. sh 248 * Dayna cards don't autoprobe well at all, but if your card is 249 * at IRQ 5 & IO 0x240 we find it every time. ;) JS 250 */ 251 for (port = ports; *port && cops_probe1(dev, *port) < 0; port++) 252 ; 253 if (!*port) 254 err = -ENODEV; 255 } 256 if (err) 257 goto out; 258 err = register_netdev(dev); 259 if (err) 260 goto out1; 261 return dev; 262 out1: 263 cleanup_card(dev); 264 out: 265 free_netdev(dev); 266 return ERR_PTR(err); 267 } 268 269 /* 270 * This is the real probe routine. Linux has a history of friendly device 271 * probes on the ISA bus. A good device probes avoids doing writes, and 272 * verifies that the correct device exists and functions. 273 */ 274 static int __init cops_probe1(struct net_device *dev, int ioaddr) 275 { 276 struct cops_local *lp; 277 static unsigned version_printed; 278 int board = board_type; 279 int retval; 280 281 if(cops_debug && version_printed++ == 0) 282 printk("%s", version); 283 284 /* Grab the region so no one else tries to probe our ioports. */ 285 if (!request_region(ioaddr, COPS_IO_EXTENT, dev->name)) 286 return -EBUSY; 287 288 /* 289 * Since this board has jumpered interrupts, allocate the interrupt 290 * vector now. There is no point in waiting since no other device 291 * can use the interrupt, and this marks the irq as busy. Jumpered 292 * interrupts are typically not reported by the boards, and we must 293 * used AutoIRQ to find them. 294 */ 295 dev->irq = irq; 296 switch (dev->irq) 297 { 298 case 0: 299 /* COPS AutoIRQ routine */ 300 dev->irq = cops_irq(ioaddr, board); 301 if (dev->irq) 302 break; 303 /* No IRQ found on this port, fallthrough */ 304 case 1: 305 retval = -EINVAL; 306 goto err_out; 307 308 /* Fixup for users that don't know that IRQ 2 is really 309 * IRQ 9, or don't know which one to set. 310 */ 311 case 2: 312 dev->irq = 9; 313 break; 314 315 /* Polled operation requested. Although irq of zero passed as 316 * a parameter tells the init routines to probe, we'll 317 * overload it to denote polled operation at runtime. 318 */ 319 case 0xff: 320 dev->irq = 0; 321 break; 322 323 default: 324 break; 325 } 326 327 /* Reserve any actual interrupt. */ 328 if (dev->irq) { 329 retval = request_irq(dev->irq, &cops_interrupt, 0, dev->name, dev); 330 if (retval) 331 goto err_out; 332 } 333 334 dev->base_addr = ioaddr; 335 336 lp = netdev_priv(dev); 337 memset(lp, 0, sizeof(struct cops_local)); 338 spin_lock_init(&lp->lock); 339 340 /* Copy local board variable to lp struct. */ 341 lp->board = board; 342 343 dev->hard_start_xmit = cops_send_packet; 344 dev->tx_timeout = cops_timeout; 345 dev->watchdog_timeo = HZ * 2; 346 dev->hard_header = cops_hard_header; 347 dev->get_stats = cops_get_stats; 348 dev->open = cops_open; 349 dev->stop = cops_close; 350 dev->do_ioctl = cops_ioctl; 351 dev->set_multicast_list = set_multicast_list; 352 dev->mc_list = NULL; 353 354 /* Tell the user where the card is and what mode we're in. */ 355 if(board==DAYNA) 356 printk("%s: %s at %#3x, using IRQ %d, in Dayna mode.\n", 357 dev->name, cardname, ioaddr, dev->irq); 358 if(board==TANGENT) { 359 if(dev->irq) 360 printk("%s: %s at %#3x, IRQ %d, in Tangent mode\n", 361 dev->name, cardname, ioaddr, dev->irq); 362 else 363 printk("%s: %s at %#3x, using polled IO, in Tangent mode.\n", 364 dev->name, cardname, ioaddr); 365 366 } 367 return 0; 368 369 err_out: 370 release_region(ioaddr, COPS_IO_EXTENT); 371 return retval; 372 } 373 374 static int __init cops_irq (int ioaddr, int board) 375 { /* 376 * This does not use the IRQ to determine where the IRQ is. We just 377 * assume that when we get a correct status response that it's the IRQ. 378 * This really just verifies the IO port but since we only have access 379 * to such a small number of IRQs (5, 4, 3) this is not bad. 380 * This will probably not work for more than one card. 381 */ 382 int irqaddr=0; 383 int i, x, status; 384 385 if(board==DAYNA) 386 { 387 outb(0, ioaddr+DAYNA_RESET); 388 inb(ioaddr+DAYNA_RESET); 389 mdelay(333); 390 } 391 if(board==TANGENT) 392 { 393 inb(ioaddr); 394 outb(0, ioaddr); 395 outb(0, ioaddr+TANG_RESET); 396 } 397 398 for(i=0; cops_irqlist[i] !=0; i++) 399 { 400 irqaddr = cops_irqlist[i]; 401 for(x = 0xFFFF; x>0; x --) /* wait for response */ 402 { 403 if(board==DAYNA) 404 { 405 status = (inb(ioaddr+DAYNA_CARD_STATUS)&3); 406 if(status == 1) 407 return irqaddr; 408 } 409 if(board==TANGENT) 410 { 411 if((inb(ioaddr+TANG_CARD_STATUS)& TANG_TX_READY) !=0) 412 return irqaddr; 413 } 414 } 415 } 416 return 0; /* no IRQ found */ 417 } 418 419 /* 420 * Open/initialize the board. This is called (in the current kernel) 421 * sometime after booting when the 'ifconfig' program is run. 422 */ 423 static int cops_open(struct net_device *dev) 424 { 425 struct cops_local *lp = netdev_priv(dev); 426 427 if(dev->irq==0) 428 { 429 /* 430 * I don't know if the Dayna-style boards support polled 431 * operation. For now, only allow it for Tangent. 432 */ 433 if(lp->board==TANGENT) /* Poll 20 times per second */ 434 { 435 init_timer(&cops_timer); 436 cops_timer.function = cops_poll; 437 cops_timer.data = (unsigned long)dev; 438 cops_timer.expires = jiffies + HZ/20; 439 add_timer(&cops_timer); 440 } 441 else 442 { 443 printk(KERN_WARNING "%s: No irq line set\n", dev->name); 444 return -EAGAIN; 445 } 446 } 447 448 cops_jumpstart(dev); /* Start the card up. */ 449 450 netif_start_queue(dev); 451 return 0; 452 } 453 454 /* 455 * This allows for a dynamic start/restart of the entire card. 456 */ 457 static int cops_jumpstart(struct net_device *dev) 458 { 459 struct cops_local *lp = netdev_priv(dev); 460 461 /* 462 * Once the card has the firmware loaded and has acquired 463 * the nodeid, if it is reset it will lose it all. 464 */ 465 cops_reset(dev,1); /* Need to reset card before load firmware. */ 466 cops_load(dev); /* Load the firmware. */ 467 468 /* 469 * If atalkd already gave us a nodeid we will use that 470 * one again, else we wait for atalkd to give us a nodeid 471 * in cops_ioctl. This may cause a problem if someone steals 472 * our nodeid while we are resetting. 473 */ 474 if(lp->nodeid == 1) 475 cops_nodeid(dev,lp->node_acquire); 476 477 return 0; 478 } 479 480 static void tangent_wait_reset(int ioaddr) 481 { 482 int timeout=0; 483 484 while(timeout++ < 5 && (inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0) 485 mdelay(1); /* Wait 1 second */ 486 } 487 488 /* 489 * Reset the LocalTalk board. 490 */ 491 static void cops_reset(struct net_device *dev, int sleep) 492 { 493 struct cops_local *lp = netdev_priv(dev); 494 int ioaddr=dev->base_addr; 495 496 if(lp->board==TANGENT) 497 { 498 inb(ioaddr); /* Clear request latch. */ 499 outb(0,ioaddr); /* Clear the TANG_TX_READY flop. */ 500 outb(0, ioaddr+TANG_RESET); /* Reset the adapter. */ 501 502 tangent_wait_reset(ioaddr); 503 outb(0, ioaddr+TANG_CLEAR_INT); 504 } 505 if(lp->board==DAYNA) 506 { 507 outb(0, ioaddr+DAYNA_RESET); /* Assert the reset port */ 508 inb(ioaddr+DAYNA_RESET); /* Clear the reset */ 509 if(sleep) 510 { 511 long snap=jiffies; 512 513 /* Let card finish initializing, about 1/3 second */ 514 while(jiffies-snap<HZ/3) 515 schedule(); 516 } 517 else 518 mdelay(333); 519 } 520 netif_wake_queue(dev); 521 return; 522 } 523 524 static void cops_load (struct net_device *dev) 525 { 526 struct ifreq ifr; 527 struct ltfirmware *ltf= (struct ltfirmware *)&ifr.ifr_ifru; 528 struct cops_local *lp = netdev_priv(dev); 529 int ioaddr=dev->base_addr; 530 int length, i = 0; 531 532 strcpy(ifr.ifr_name,"lt0"); 533 534 /* Get card's firmware code and do some checks on it. */ 535 #ifdef CONFIG_COPS_DAYNA 536 if(lp->board==DAYNA) 537 { 538 ltf->length=sizeof(ffdrv_code); 539 ltf->data=ffdrv_code; 540 } 541 else 542 #endif 543 #ifdef CONFIG_COPS_TANGENT 544 if(lp->board==TANGENT) 545 { 546 ltf->length=sizeof(ltdrv_code); 547 ltf->data=ltdrv_code; 548 } 549 else 550 #endif 551 { 552 printk(KERN_INFO "%s; unsupported board type.\n", dev->name); 553 return; 554 } 555 556 /* Check to make sure firmware is correct length. */ 557 if(lp->board==DAYNA && ltf->length!=5983) 558 { 559 printk(KERN_WARNING "%s: Firmware is not length of FFDRV.BIN.\n", dev->name); 560 return; 561 } 562 if(lp->board==TANGENT && ltf->length!=2501) 563 { 564 printk(KERN_WARNING "%s: Firmware is not length of DRVCODE.BIN.\n", dev->name); 565 return; 566 } 567 568 if(lp->board==DAYNA) 569 { 570 /* 571 * We must wait for a status response 572 * with the DAYNA board. 573 */ 574 while(++i<65536) 575 { 576 if((inb(ioaddr+DAYNA_CARD_STATUS)&3)==1) 577 break; 578 } 579 580 if(i==65536) 581 return; 582 } 583 584 /* 585 * Upload the firmware and kick. Byte-by-byte works nicely here. 586 */ 587 i=0; 588 length = ltf->length; 589 while(length--) 590 { 591 outb(ltf->data[i], ioaddr); 592 i++; 593 } 594 595 if(cops_debug > 1) 596 printk("%s: Uploaded firmware - %d bytes of %d bytes.\n", 597 dev->name, i, ltf->length); 598 599 if(lp->board==DAYNA) /* Tell Dayna to run the firmware code. */ 600 outb(1, ioaddr+DAYNA_INT_CARD); 601 else /* Tell Tang to run the firmware code. */ 602 inb(ioaddr); 603 604 if(lp->board==TANGENT) 605 { 606 tangent_wait_reset(ioaddr); 607 inb(ioaddr); /* Clear initial ready signal. */ 608 } 609 610 return; 611 } 612 613 /* 614 * Get the LocalTalk Nodeid from the card. We can suggest 615 * any nodeid 1-254. The card will try and get that exact 616 * address else we can specify 0 as the nodeid and the card 617 * will autoprobe for a nodeid. 618 */ 619 static int cops_nodeid (struct net_device *dev, int nodeid) 620 { 621 struct cops_local *lp = netdev_priv(dev); 622 int ioaddr = dev->base_addr; 623 624 if(lp->board == DAYNA) 625 { 626 /* Empty any pending adapter responses. */ 627 while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0) 628 { 629 outb(0, ioaddr+COPS_CLEAR_INT); /* Clear interrupts. */ 630 if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST) 631 cops_rx(dev); /* Kick any packets waiting. */ 632 schedule(); 633 } 634 635 outb(2, ioaddr); /* Output command packet length as 2. */ 636 outb(0, ioaddr); 637 outb(LAP_INIT, ioaddr); /* Send LAP_INIT command byte. */ 638 outb(nodeid, ioaddr); /* Suggest node address. */ 639 } 640 641 if(lp->board == TANGENT) 642 { 643 /* Empty any pending adapter responses. */ 644 while(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY) 645 { 646 outb(0, ioaddr+COPS_CLEAR_INT); /* Clear interrupt. */ 647 cops_rx(dev); /* Kick out packets waiting. */ 648 schedule(); 649 } 650 651 /* Not sure what Tangent does if nodeid picked is used. */ 652 if(nodeid == 0) /* Seed. */ 653 nodeid = jiffies&0xFF; /* Get a random try */ 654 outb(2, ioaddr); /* Command length LSB */ 655 outb(0, ioaddr); /* Command length MSB */ 656 outb(LAP_INIT, ioaddr); /* Send LAP_INIT byte */ 657 outb(nodeid, ioaddr); /* LAP address hint. */ 658 outb(0xFF, ioaddr); /* Int. level to use */ 659 } 660 661 lp->node_acquire=0; /* Set nodeid holder to 0. */ 662 while(lp->node_acquire==0) /* Get *True* nodeid finally. */ 663 { 664 outb(0, ioaddr+COPS_CLEAR_INT); /* Clear any interrupt. */ 665 666 if(lp->board == DAYNA) 667 { 668 if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST) 669 cops_rx(dev); /* Grab the nodeid put in lp->node_acquire. */ 670 } 671 if(lp->board == TANGENT) 672 { 673 if(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY) 674 cops_rx(dev); /* Grab the nodeid put in lp->node_acquire. */ 675 } 676 schedule(); 677 } 678 679 if(cops_debug > 1) 680 printk(KERN_DEBUG "%s: Node ID %d has been acquired.\n", 681 dev->name, lp->node_acquire); 682 683 lp->nodeid=1; /* Set got nodeid to 1. */ 684 685 return 0; 686 } 687 688 /* 689 * Poll the Tangent type cards to see if we have work. 690 */ 691 692 static void cops_poll(unsigned long ltdev) 693 { 694 int ioaddr, status; 695 int boguscount = 0; 696 697 struct net_device *dev = (struct net_device *)ltdev; 698 699 del_timer(&cops_timer); 700 701 if(dev == NULL) 702 return; /* We've been downed */ 703 704 ioaddr = dev->base_addr; 705 do { 706 status=inb(ioaddr+TANG_CARD_STATUS); 707 if(status & TANG_RX_READY) 708 cops_rx(dev); 709 if(status & TANG_TX_READY) 710 netif_wake_queue(dev); 711 status = inb(ioaddr+TANG_CARD_STATUS); 712 } while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY))); 713 714 /* poll 20 times per second */ 715 cops_timer.expires = jiffies + HZ/20; 716 add_timer(&cops_timer); 717 718 return; 719 } 720 721 /* 722 * The typical workload of the driver: 723 * Handle the network interface interrupts. 724 */ 725 static irqreturn_t cops_interrupt(int irq, void *dev_id, struct pt_regs * regs) 726 { 727 struct net_device *dev = dev_id; 728 struct cops_local *lp; 729 int ioaddr, status; 730 int boguscount = 0; 731 732 ioaddr = dev->base_addr; 733 lp = netdev_priv(dev); 734 735 if(lp->board==DAYNA) 736 { 737 do { 738 outb(0, ioaddr + COPS_CLEAR_INT); 739 status=inb(ioaddr+DAYNA_CARD_STATUS); 740 if((status&0x03)==DAYNA_RX_REQUEST) 741 cops_rx(dev); 742 netif_wake_queue(dev); 743 } while(++boguscount < 20); 744 } 745 else 746 { 747 do { 748 status=inb(ioaddr+TANG_CARD_STATUS); 749 if(status & TANG_RX_READY) 750 cops_rx(dev); 751 if(status & TANG_TX_READY) 752 netif_wake_queue(dev); 753 status=inb(ioaddr+TANG_CARD_STATUS); 754 } while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY))); 755 } 756 757 return IRQ_HANDLED; 758 } 759 760 /* 761 * We have a good packet(s), get it/them out of the buffers. 762 */ 763 static void cops_rx(struct net_device *dev) 764 { 765 int pkt_len = 0; 766 int rsp_type = 0; 767 struct sk_buff *skb = NULL; 768 struct cops_local *lp = netdev_priv(dev); 769 int ioaddr = dev->base_addr; 770 int boguscount = 0; 771 unsigned long flags; 772 773 774 spin_lock_irqsave(&lp->lock, flags); 775 776 if(lp->board==DAYNA) 777 { 778 outb(0, ioaddr); /* Send out Zero length. */ 779 outb(0, ioaddr); 780 outb(DATA_READ, ioaddr); /* Send read command out. */ 781 782 /* Wait for DMA to turn around. */ 783 while(++boguscount<1000000) 784 { 785 barrier(); 786 if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_READY) 787 break; 788 } 789 790 if(boguscount==1000000) 791 { 792 printk(KERN_WARNING "%s: DMA timed out.\n",dev->name); 793 spin_unlock_irqrestore(&lp->lock, flags); 794 return; 795 } 796 } 797 798 /* Get response length. */ 799 if(lp->board==DAYNA) 800 pkt_len = inb(ioaddr) & 0xFF; 801 else 802 pkt_len = inb(ioaddr) & 0x00FF; 803 pkt_len |= (inb(ioaddr) << 8); 804 /* Input IO code. */ 805 rsp_type=inb(ioaddr); 806 807 /* Malloc up new buffer. */ 808 skb = dev_alloc_skb(pkt_len); 809 if(skb == NULL) 810 { 811 printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", 812 dev->name); 813 lp->stats.rx_dropped++; 814 while(pkt_len--) /* Discard packet */ 815 inb(ioaddr); 816 spin_unlock_irqrestore(&lp->lock, flags); 817 return; 818 } 819 skb->dev = dev; 820 skb_put(skb, pkt_len); 821 skb->protocol = htons(ETH_P_LOCALTALK); 822 823 insb(ioaddr, skb->data, pkt_len); /* Eat the Data */ 824 825 if(lp->board==DAYNA) 826 outb(1, ioaddr+DAYNA_INT_CARD); /* Interrupt the card */ 827 828 spin_unlock_irqrestore(&lp->lock, flags); /* Restore interrupts. */ 829 830 /* Check for bad response length */ 831 if(pkt_len < 0 || pkt_len > MAX_LLAP_SIZE) 832 { 833 printk(KERN_WARNING "%s: Bad packet length of %d bytes.\n", 834 dev->name, pkt_len); 835 lp->stats.tx_errors++; 836 dev_kfree_skb_any(skb); 837 return; 838 } 839 840 /* Set nodeid and then get out. */ 841 if(rsp_type == LAP_INIT_RSP) 842 { /* Nodeid taken from received packet. */ 843 lp->node_acquire = skb->data[0]; 844 dev_kfree_skb_any(skb); 845 return; 846 } 847 848 /* One last check to make sure we have a good packet. */ 849 if(rsp_type != LAP_RESPONSE) 850 { 851 printk(KERN_WARNING "%s: Bad packet type %d.\n", dev->name, rsp_type); 852 lp->stats.tx_errors++; 853 dev_kfree_skb_any(skb); 854 return; 855 } 856 857 skb->mac.raw = skb->data; /* Point to entire packet. */ 858 skb_pull(skb,3); 859 skb->h.raw = skb->data; /* Point to data (Skip header). */ 860 861 /* Update the counters. */ 862 lp->stats.rx_packets++; 863 lp->stats.rx_bytes += skb->len; 864 865 /* Send packet to a higher place. */ 866 netif_rx(skb); 867 dev->last_rx = jiffies; 868 } 869 870 static void cops_timeout(struct net_device *dev) 871 { 872 struct cops_local *lp = netdev_priv(dev); 873 int ioaddr = dev->base_addr; 874 875 lp->stats.tx_errors++; 876 if(lp->board==TANGENT) 877 { 878 if((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0) 879 printk(KERN_WARNING "%s: No TX complete interrupt.\n", dev->name); 880 } 881 printk(KERN_WARNING "%s: Transmit timed out.\n", dev->name); 882 cops_jumpstart(dev); /* Restart the card. */ 883 dev->trans_start = jiffies; 884 netif_wake_queue(dev); 885 } 886 887 888 /* 889 * Make the card transmit a LocalTalk packet. 890 */ 891 892 static int cops_send_packet(struct sk_buff *skb, struct net_device *dev) 893 { 894 struct cops_local *lp = netdev_priv(dev); 895 int ioaddr = dev->base_addr; 896 unsigned long flags; 897 898 /* 899 * Block a timer-based transmit from overlapping. 900 */ 901 902 netif_stop_queue(dev); 903 904 spin_lock_irqsave(&lp->lock, flags); 905 if(lp->board == DAYNA) /* Wait for adapter transmit buffer. */ 906 while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0) 907 cpu_relax(); 908 if(lp->board == TANGENT) /* Wait for adapter transmit buffer. */ 909 while((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0) 910 cpu_relax(); 911 912 /* Output IO length. */ 913 outb(skb->len, ioaddr); 914 if(lp->board == DAYNA) 915 outb(skb->len >> 8, ioaddr); 916 else 917 outb((skb->len >> 8)&0x0FF, ioaddr); 918 919 /* Output IO code. */ 920 outb(LAP_WRITE, ioaddr); 921 922 if(lp->board == DAYNA) /* Check the transmit buffer again. */ 923 while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0); 924 925 outsb(ioaddr, skb->data, skb->len); /* Send out the data. */ 926 927 if(lp->board==DAYNA) /* Dayna requires you kick the card */ 928 outb(1, ioaddr+DAYNA_INT_CARD); 929 930 spin_unlock_irqrestore(&lp->lock, flags); /* Restore interrupts. */ 931 932 /* Done sending packet, update counters and cleanup. */ 933 lp->stats.tx_packets++; 934 lp->stats.tx_bytes += skb->len; 935 dev->trans_start = jiffies; 936 dev_kfree_skb (skb); 937 return 0; 938 } 939 940 /* 941 * Dummy function to keep the Appletalk layer happy. 942 */ 943 944 static void set_multicast_list(struct net_device *dev) 945 { 946 if(cops_debug >= 3) 947 printk("%s: set_multicast_list executed\n", dev->name); 948 } 949 950 /* 951 * Another Dummy function to keep the Appletalk layer happy. 952 */ 953 954 static int cops_hard_header(struct sk_buff *skb, struct net_device *dev, 955 unsigned short type, void *daddr, void *saddr, 956 unsigned len) 957 { 958 if(cops_debug >= 3) 959 printk("%s: cops_hard_header executed. Wow!\n", dev->name); 960 return 0; 961 } 962 963 /* 964 * System ioctls for the COPS LocalTalk card. 965 */ 966 967 static int cops_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 968 { 969 struct cops_local *lp = netdev_priv(dev); 970 struct sockaddr_at *sa = (struct sockaddr_at *)&ifr->ifr_addr; 971 struct atalk_addr *aa = (struct atalk_addr *)&lp->node_addr; 972 973 switch(cmd) 974 { 975 case SIOCSIFADDR: 976 /* Get and set the nodeid and network # atalkd wants. */ 977 cops_nodeid(dev, sa->sat_addr.s_node); 978 aa->s_net = sa->sat_addr.s_net; 979 aa->s_node = lp->node_acquire; 980 981 /* Set broardcast address. */ 982 dev->broadcast[0] = 0xFF; 983 984 /* Set hardware address. */ 985 dev->dev_addr[0] = aa->s_node; 986 dev->addr_len = 1; 987 return 0; 988 989 case SIOCGIFADDR: 990 sa->sat_addr.s_net = aa->s_net; 991 sa->sat_addr.s_node = aa->s_node; 992 return 0; 993 994 default: 995 return -EOPNOTSUPP; 996 } 997 } 998 999 /* 1000 * The inverse routine to cops_open(). 1001 */ 1002 1003 static int cops_close(struct net_device *dev) 1004 { 1005 struct cops_local *lp = netdev_priv(dev); 1006 1007 /* If we were running polled, yank the timer. 1008 */ 1009 if(lp->board==TANGENT && dev->irq==0) 1010 del_timer(&cops_timer); 1011 1012 netif_stop_queue(dev); 1013 return 0; 1014 } 1015 1016 /* 1017 * Get the current statistics. 1018 * This may be called with the card open or closed. 1019 */ 1020 static struct net_device_stats *cops_get_stats(struct net_device *dev) 1021 { 1022 struct cops_local *lp = netdev_priv(dev); 1023 return &lp->stats; 1024 } 1025 1026 #ifdef MODULE 1027 static struct net_device *cops_dev; 1028 1029 MODULE_LICENSE("GPL"); 1030 module_param(io, int, 0); 1031 module_param(irq, int, 0); 1032 module_param(board_type, int, 0); 1033 1034 int init_module(void) 1035 { 1036 if (io == 0) 1037 printk(KERN_WARNING "%s: You shouldn't autoprobe with insmod\n", 1038 cardname); 1039 cops_dev = cops_probe(-1); 1040 if (IS_ERR(cops_dev)) 1041 return PTR_ERR(cops_dev); 1042 return 0; 1043 } 1044 1045 void cleanup_module(void) 1046 { 1047 unregister_netdev(cops_dev); 1048 cleanup_card(cops_dev); 1049 free_netdev(cops_dev); 1050 } 1051 #endif /* MODULE */ 1052 1053 /* 1054 * Local variables: 1055 * compile-command: "gcc -DMODVERSIONS -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -c cops.c" 1056 * c-basic-offset: 4 1057 * c-file-offsets: ((substatement-open . 0)) 1058 * End: 1059 */ 1060