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