blob: c4b560d42a67a0dac5e8eeb6713edc09b0e51a43 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
36static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#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/slab.h>
60#include <linux/string.h>
61#include <linux/errno.h>
62#include <linux/init.h>
63#include <linux/netdevice.h>
64#include <linux/etherdevice.h>
65#include <linux/skbuff.h>
66#include <linux/if_arp.h>
Christoph Hellwig3ef4e9a2005-05-05 14:25:59 -070067#include <linux/if_ltalk.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/delay.h> /* For udelay() */
69#include <linux/atalk.h>
70#include <linux/spinlock.h>
71#include <linux/bitops.h>
72
73#include <asm/system.h>
74#include <asm/io.h>
75#include <asm/dma.h>
76
77#include "cops.h" /* Our Stuff */
78#include "cops_ltdrv.h" /* Firmware code for Tangent type cards. */
79#include "cops_ffdrv.h" /* Firmware code for Dayna type cards. */
80
81/*
82 * The name of the card. Is used for messages and in the requests for
83 * io regions, irqs and dma channels
84 */
85
86static const char *cardname = "cops";
87
88#ifdef CONFIG_COPS_DAYNA
89static int board_type = DAYNA; /* Module exported */
90#else
91static int board_type = TANGENT;
92#endif
93
94static int io = 0x240; /* Default IO for Dayna */
95static int irq = 5; /* Default IRQ */
96
97/*
98 * COPS Autoprobe information.
99 * Right now if port address is right but IRQ is not 5 this will
100 * return a 5 no matter what since we will still get a status response.
101 * Need one more additional check to narrow down after we have gotten
102 * the ioaddr. But since only other possible IRQs is 3 and 4 so no real
103 * hurry on this. I *STRONGLY* recommend using IRQ 5 for your card with
104 * this driver.
105 *
106 * This driver has 2 modes and they are: Dayna mode and Tangent mode.
107 * Each mode corresponds with the type of card. It has been found
108 * that there are 2 main types of cards and all other cards are
109 * the same and just have different names or only have minor differences
110 * such as more IO ports. As this driver is tested it will
111 * become more clear on exactly what cards are supported. The driver
112 * defaults to using Dayna mode. To change the drivers mode, simply
113 * select Dayna or Tangent mode when configuring the kernel.
114 *
115 * This driver should support:
116 * TANGENT driver mode:
117 * Tangent ATB-II, Novell NL-1000, Daystar Digital LT-200,
118 * COPS LT-1
119 * DAYNA driver mode:
120 * Dayna DL2000/DaynaTalk PC (Half Length), COPS LT-95,
121 * Farallon PhoneNET PC III, Farallon PhoneNET PC II
122 * Other cards possibly supported mode unkown though:
123 * Dayna DL2000 (Full length), COPS LT/M (Micro-Channel)
124 *
125 * Cards NOT supported by this driver but supported by the ltpc.c
126 * driver written by Bradford W. Johnson <johns393@maroon.tc.umn.edu>
127 * Farallon PhoneNET PC
128 * Original Apple LocalTalk PC card
129 *
130 * N.B.
131 *
132 * The Daystar Digital LT200 boards do not support interrupt-driven
133 * IO. You must specify 'irq=0xff' as a module parameter to invoke
134 * polled mode. I also believe that the port probing logic is quite
135 * dangerous at best and certainly hopeless for a polled card. Best to
136 * specify both. - Steve H.
137 *
138 */
139
140/*
141 * Zero terminated list of IO ports to probe.
142 */
143
144static unsigned int ports[] = {
145 0x240, 0x340, 0x200, 0x210, 0x220, 0x230, 0x260,
146 0x2A0, 0x300, 0x310, 0x320, 0x330, 0x350, 0x360,
147 0
148};
149
150/*
151 * Zero terminated list of IRQ ports to probe.
152 */
153
154static int cops_irqlist[] = {
155 5, 4, 3, 0
156};
157
158static struct timer_list cops_timer;
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
164static 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
171struct cops_local
172{
173 struct net_device_stats stats;
174 int board; /* Holds what board type is. */
175 int nodeid; /* Set to 1 once have nodeid. */
176 unsigned char node_acquire; /* Node ID when acquired. */
177 struct atalk_addr node_addr; /* Full node address */
178 spinlock_t lock; /* RX/TX lock */
179};
180
181/* Index to functions, as function prototypes. */
182static int cops_probe1 (struct net_device *dev, int ioaddr);
183static int cops_irq (int ioaddr, int board);
184
185static int cops_open (struct net_device *dev);
186static int cops_jumpstart (struct net_device *dev);
187static void cops_reset (struct net_device *dev, int sleep);
188static void cops_load (struct net_device *dev);
189static int cops_nodeid (struct net_device *dev, int nodeid);
190
David Howells7d12e782006-10-05 14:55:46 +0100191static irqreturn_t cops_interrupt (int irq, void *dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192static void cops_poll (unsigned long ltdev);
193static void cops_timeout(struct net_device *dev);
194static void cops_rx (struct net_device *dev);
195static int cops_send_packet (struct sk_buff *skb, struct net_device *dev);
196static void set_multicast_list (struct net_device *dev);
197static int cops_hard_header (struct sk_buff *skb, struct net_device *dev,
198 unsigned short type, void *daddr, void *saddr,
199 unsigned len);
200
201static int cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
202static int cops_close (struct net_device *dev);
203static struct net_device_stats *cops_get_stats (struct net_device *dev);
204
205static void cleanup_card(struct net_device *dev)
206{
207 if (dev->irq)
208 free_irq(dev->irq, dev);
209 release_region(dev->base_addr, COPS_IO_EXTENT);
210}
211
212/*
213 * Check for a network adaptor of this type, and return '0' iff one exists.
214 * If dev->base_addr == 0, probe all likely locations.
215 * If dev->base_addr in [1..0x1ff], always return failure.
216 * otherwise go with what we pass in.
217 */
218struct net_device * __init cops_probe(int unit)
219{
220 struct net_device *dev;
221 unsigned *port;
222 int base_addr;
223 int err = 0;
224
Christoph Hellwig3ef4e9a2005-05-05 14:25:59 -0700225 dev = alloc_ltalkdev(sizeof(struct cops_local));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (!dev)
227 return ERR_PTR(-ENOMEM);
228
229 if (unit >= 0) {
230 sprintf(dev->name, "lt%d", unit);
231 netdev_boot_setup_check(dev);
232 irq = dev->irq;
233 base_addr = dev->base_addr;
234 } else {
235 base_addr = dev->base_addr = io;
236 }
237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (base_addr > 0x1ff) { /* Check a single specified location. */
239 err = cops_probe1(dev, base_addr);
240 } else if (base_addr != 0) { /* Don't probe at all. */
241 err = -ENXIO;
242 } else {
243 /* FIXME Does this really work for cards which generate irq?
244 * It's definitely N.G. for polled Tangent. sh
245 * Dayna cards don't autoprobe well at all, but if your card is
246 * at IRQ 5 & IO 0x240 we find it every time. ;) JS
247 */
248 for (port = ports; *port && cops_probe1(dev, *port) < 0; port++)
249 ;
250 if (!*port)
251 err = -ENODEV;
252 }
253 if (err)
254 goto out;
255 err = register_netdev(dev);
256 if (err)
257 goto out1;
258 return dev;
259out1:
260 cleanup_card(dev);
261out:
262 free_netdev(dev);
263 return ERR_PTR(err);
264}
265
266/*
267 * This is the real probe routine. Linux has a history of friendly device
268 * probes on the ISA bus. A good device probes avoids doing writes, and
269 * verifies that the correct device exists and functions.
270 */
271static int __init cops_probe1(struct net_device *dev, int ioaddr)
272{
273 struct cops_local *lp;
274 static unsigned version_printed;
275 int board = board_type;
276 int retval;
277
278 if(cops_debug && version_printed++ == 0)
279 printk("%s", version);
280
281 /* Grab the region so no one else tries to probe our ioports. */
282 if (!request_region(ioaddr, COPS_IO_EXTENT, dev->name))
283 return -EBUSY;
284
285 /*
286 * Since this board has jumpered interrupts, allocate the interrupt
287 * vector now. There is no point in waiting since no other device
288 * can use the interrupt, and this marks the irq as busy. Jumpered
289 * interrupts are typically not reported by the boards, and we must
290 * used AutoIRQ to find them.
291 */
292 dev->irq = irq;
293 switch (dev->irq)
294 {
295 case 0:
296 /* COPS AutoIRQ routine */
297 dev->irq = cops_irq(ioaddr, board);
298 if (dev->irq)
299 break;
300 /* No IRQ found on this port, fallthrough */
301 case 1:
302 retval = -EINVAL;
303 goto err_out;
304
305 /* Fixup for users that don't know that IRQ 2 is really
306 * IRQ 9, or don't know which one to set.
307 */
308 case 2:
309 dev->irq = 9;
310 break;
311
312 /* Polled operation requested. Although irq of zero passed as
313 * a parameter tells the init routines to probe, we'll
314 * overload it to denote polled operation at runtime.
315 */
316 case 0xff:
317 dev->irq = 0;
318 break;
319
320 default:
321 break;
322 }
323
324 /* Reserve any actual interrupt. */
325 if (dev->irq) {
326 retval = request_irq(dev->irq, &cops_interrupt, 0, dev->name, dev);
327 if (retval)
328 goto err_out;
329 }
330
331 dev->base_addr = ioaddr;
332
333 lp = netdev_priv(dev);
334 memset(lp, 0, sizeof(struct cops_local));
335 spin_lock_init(&lp->lock);
336
337 /* Copy local board variable to lp struct. */
338 lp->board = board;
339
340 dev->hard_start_xmit = cops_send_packet;
341 dev->tx_timeout = cops_timeout;
342 dev->watchdog_timeo = HZ * 2;
343 dev->hard_header = cops_hard_header;
344 dev->get_stats = cops_get_stats;
345 dev->open = cops_open;
346 dev->stop = cops_close;
347 dev->do_ioctl = cops_ioctl;
348 dev->set_multicast_list = set_multicast_list;
349 dev->mc_list = NULL;
350
351 /* Tell the user where the card is and what mode we're in. */
352 if(board==DAYNA)
353 printk("%s: %s at %#3x, using IRQ %d, in Dayna mode.\n",
354 dev->name, cardname, ioaddr, dev->irq);
355 if(board==TANGENT) {
356 if(dev->irq)
357 printk("%s: %s at %#3x, IRQ %d, in Tangent mode\n",
358 dev->name, cardname, ioaddr, dev->irq);
359 else
360 printk("%s: %s at %#3x, using polled IO, in Tangent mode.\n",
361 dev->name, cardname, ioaddr);
362
363 }
364 return 0;
365
366err_out:
367 release_region(ioaddr, COPS_IO_EXTENT);
368 return retval;
369}
370
371static int __init cops_irq (int ioaddr, int board)
372{ /*
373 * This does not use the IRQ to determine where the IRQ is. We just
374 * assume that when we get a correct status response that it's the IRQ.
375 * This really just verifies the IO port but since we only have access
376 * to such a small number of IRQs (5, 4, 3) this is not bad.
377 * This will probably not work for more than one card.
378 */
379 int irqaddr=0;
380 int i, x, status;
381
382 if(board==DAYNA)
383 {
384 outb(0, ioaddr+DAYNA_RESET);
385 inb(ioaddr+DAYNA_RESET);
386 mdelay(333);
387 }
388 if(board==TANGENT)
389 {
390 inb(ioaddr);
391 outb(0, ioaddr);
392 outb(0, ioaddr+TANG_RESET);
393 }
394
395 for(i=0; cops_irqlist[i] !=0; i++)
396 {
397 irqaddr = cops_irqlist[i];
398 for(x = 0xFFFF; x>0; x --) /* wait for response */
399 {
400 if(board==DAYNA)
401 {
402 status = (inb(ioaddr+DAYNA_CARD_STATUS)&3);
403 if(status == 1)
404 return irqaddr;
405 }
406 if(board==TANGENT)
407 {
408 if((inb(ioaddr+TANG_CARD_STATUS)& TANG_TX_READY) !=0)
409 return irqaddr;
410 }
411 }
412 }
413 return 0; /* no IRQ found */
414}
415
416/*
417 * Open/initialize the board. This is called (in the current kernel)
418 * sometime after booting when the 'ifconfig' program is run.
419 */
420static int cops_open(struct net_device *dev)
421{
422 struct cops_local *lp = netdev_priv(dev);
423
424 if(dev->irq==0)
425 {
426 /*
427 * I don't know if the Dayna-style boards support polled
428 * operation. For now, only allow it for Tangent.
429 */
430 if(lp->board==TANGENT) /* Poll 20 times per second */
431 {
432 init_timer(&cops_timer);
433 cops_timer.function = cops_poll;
434 cops_timer.data = (unsigned long)dev;
435 cops_timer.expires = jiffies + HZ/20;
436 add_timer(&cops_timer);
437 }
438 else
439 {
440 printk(KERN_WARNING "%s: No irq line set\n", dev->name);
441 return -EAGAIN;
442 }
443 }
444
445 cops_jumpstart(dev); /* Start the card up. */
446
447 netif_start_queue(dev);
448 return 0;
449}
450
451/*
452 * This allows for a dynamic start/restart of the entire card.
453 */
454static int cops_jumpstart(struct net_device *dev)
455{
456 struct cops_local *lp = netdev_priv(dev);
457
458 /*
459 * Once the card has the firmware loaded and has acquired
460 * the nodeid, if it is reset it will lose it all.
461 */
462 cops_reset(dev,1); /* Need to reset card before load firmware. */
463 cops_load(dev); /* Load the firmware. */
464
465 /*
466 * If atalkd already gave us a nodeid we will use that
467 * one again, else we wait for atalkd to give us a nodeid
468 * in cops_ioctl. This may cause a problem if someone steals
469 * our nodeid while we are resetting.
470 */
471 if(lp->nodeid == 1)
472 cops_nodeid(dev,lp->node_acquire);
473
474 return 0;
475}
476
477static void tangent_wait_reset(int ioaddr)
478{
479 int timeout=0;
480
481 while(timeout++ < 5 && (inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
482 mdelay(1); /* Wait 1 second */
483}
484
485/*
486 * Reset the LocalTalk board.
487 */
488static void cops_reset(struct net_device *dev, int sleep)
489{
490 struct cops_local *lp = netdev_priv(dev);
491 int ioaddr=dev->base_addr;
492
493 if(lp->board==TANGENT)
494 {
495 inb(ioaddr); /* Clear request latch. */
496 outb(0,ioaddr); /* Clear the TANG_TX_READY flop. */
497 outb(0, ioaddr+TANG_RESET); /* Reset the adapter. */
498
499 tangent_wait_reset(ioaddr);
500 outb(0, ioaddr+TANG_CLEAR_INT);
501 }
502 if(lp->board==DAYNA)
503 {
504 outb(0, ioaddr+DAYNA_RESET); /* Assert the reset port */
505 inb(ioaddr+DAYNA_RESET); /* Clear the reset */
506 if(sleep)
507 {
508 long snap=jiffies;
509
510 /* Let card finish initializing, about 1/3 second */
511 while(jiffies-snap<HZ/3)
512 schedule();
513 }
514 else
515 mdelay(333);
516 }
517 netif_wake_queue(dev);
518 return;
519}
520
521static void cops_load (struct net_device *dev)
522{
523 struct ifreq ifr;
524 struct ltfirmware *ltf= (struct ltfirmware *)&ifr.ifr_ifru;
525 struct cops_local *lp = netdev_priv(dev);
526 int ioaddr=dev->base_addr;
527 int length, i = 0;
528
529 strcpy(ifr.ifr_name,"lt0");
530
531 /* Get card's firmware code and do some checks on it. */
532#ifdef CONFIG_COPS_DAYNA
533 if(lp->board==DAYNA)
534 {
535 ltf->length=sizeof(ffdrv_code);
536 ltf->data=ffdrv_code;
537 }
538 else
539#endif
540#ifdef CONFIG_COPS_TANGENT
541 if(lp->board==TANGENT)
542 {
543 ltf->length=sizeof(ltdrv_code);
544 ltf->data=ltdrv_code;
545 }
546 else
547#endif
548 {
549 printk(KERN_INFO "%s; unsupported board type.\n", dev->name);
550 return;
551 }
552
553 /* Check to make sure firmware is correct length. */
554 if(lp->board==DAYNA && ltf->length!=5983)
555 {
556 printk(KERN_WARNING "%s: Firmware is not length of FFDRV.BIN.\n", dev->name);
557 return;
558 }
559 if(lp->board==TANGENT && ltf->length!=2501)
560 {
561 printk(KERN_WARNING "%s: Firmware is not length of DRVCODE.BIN.\n", dev->name);
562 return;
563 }
564
565 if(lp->board==DAYNA)
566 {
567 /*
568 * We must wait for a status response
569 * with the DAYNA board.
570 */
571 while(++i<65536)
572 {
573 if((inb(ioaddr+DAYNA_CARD_STATUS)&3)==1)
574 break;
575 }
576
577 if(i==65536)
578 return;
579 }
580
581 /*
582 * Upload the firmware and kick. Byte-by-byte works nicely here.
583 */
584 i=0;
585 length = ltf->length;
586 while(length--)
587 {
588 outb(ltf->data[i], ioaddr);
589 i++;
590 }
591
592 if(cops_debug > 1)
593 printk("%s: Uploaded firmware - %d bytes of %d bytes.\n",
594 dev->name, i, ltf->length);
595
596 if(lp->board==DAYNA) /* Tell Dayna to run the firmware code. */
597 outb(1, ioaddr+DAYNA_INT_CARD);
598 else /* Tell Tang to run the firmware code. */
599 inb(ioaddr);
600
601 if(lp->board==TANGENT)
602 {
603 tangent_wait_reset(ioaddr);
604 inb(ioaddr); /* Clear initial ready signal. */
605 }
606
607 return;
608}
609
610/*
611 * Get the LocalTalk Nodeid from the card. We can suggest
612 * any nodeid 1-254. The card will try and get that exact
613 * address else we can specify 0 as the nodeid and the card
614 * will autoprobe for a nodeid.
615 */
616static int cops_nodeid (struct net_device *dev, int nodeid)
617{
618 struct cops_local *lp = netdev_priv(dev);
619 int ioaddr = dev->base_addr;
620
621 if(lp->board == DAYNA)
622 {
623 /* Empty any pending adapter responses. */
624 while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
625 {
626 outb(0, ioaddr+COPS_CLEAR_INT); /* Clear interrupts. */
627 if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
628 cops_rx(dev); /* Kick any packets waiting. */
629 schedule();
630 }
631
632 outb(2, ioaddr); /* Output command packet length as 2. */
633 outb(0, ioaddr);
634 outb(LAP_INIT, ioaddr); /* Send LAP_INIT command byte. */
635 outb(nodeid, ioaddr); /* Suggest node address. */
636 }
637
638 if(lp->board == TANGENT)
639 {
640 /* Empty any pending adapter responses. */
641 while(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
642 {
643 outb(0, ioaddr+COPS_CLEAR_INT); /* Clear interrupt. */
644 cops_rx(dev); /* Kick out packets waiting. */
645 schedule();
646 }
647
648 /* Not sure what Tangent does if nodeid picked is used. */
649 if(nodeid == 0) /* Seed. */
650 nodeid = jiffies&0xFF; /* Get a random try */
651 outb(2, ioaddr); /* Command length LSB */
652 outb(0, ioaddr); /* Command length MSB */
653 outb(LAP_INIT, ioaddr); /* Send LAP_INIT byte */
654 outb(nodeid, ioaddr); /* LAP address hint. */
655 outb(0xFF, ioaddr); /* Int. level to use */
656 }
657
658 lp->node_acquire=0; /* Set nodeid holder to 0. */
659 while(lp->node_acquire==0) /* Get *True* nodeid finally. */
660 {
661 outb(0, ioaddr+COPS_CLEAR_INT); /* Clear any interrupt. */
662
663 if(lp->board == DAYNA)
664 {
665 if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
666 cops_rx(dev); /* Grab the nodeid put in lp->node_acquire. */
667 }
668 if(lp->board == TANGENT)
669 {
670 if(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
671 cops_rx(dev); /* Grab the nodeid put in lp->node_acquire. */
672 }
673 schedule();
674 }
675
676 if(cops_debug > 1)
677 printk(KERN_DEBUG "%s: Node ID %d has been acquired.\n",
678 dev->name, lp->node_acquire);
679
680 lp->nodeid=1; /* Set got nodeid to 1. */
681
682 return 0;
683}
684
685/*
686 * Poll the Tangent type cards to see if we have work.
687 */
688
689static void cops_poll(unsigned long ltdev)
690{
691 int ioaddr, status;
692 int boguscount = 0;
693
694 struct net_device *dev = (struct net_device *)ltdev;
695
696 del_timer(&cops_timer);
697
698 if(dev == NULL)
699 return; /* We've been downed */
700
701 ioaddr = dev->base_addr;
702 do {
703 status=inb(ioaddr+TANG_CARD_STATUS);
704 if(status & TANG_RX_READY)
705 cops_rx(dev);
706 if(status & TANG_TX_READY)
707 netif_wake_queue(dev);
708 status = inb(ioaddr+TANG_CARD_STATUS);
709 } while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
710
711 /* poll 20 times per second */
712 cops_timer.expires = jiffies + HZ/20;
713 add_timer(&cops_timer);
714
715 return;
716}
717
718/*
719 * The typical workload of the driver:
720 * Handle the network interface interrupts.
721 */
David Howells7d12e782006-10-05 14:55:46 +0100722static irqreturn_t cops_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723{
724 struct net_device *dev = dev_id;
725 struct cops_local *lp;
726 int ioaddr, status;
727 int boguscount = 0;
728
729 ioaddr = dev->base_addr;
730 lp = netdev_priv(dev);
731
732 if(lp->board==DAYNA)
733 {
734 do {
735 outb(0, ioaddr + COPS_CLEAR_INT);
736 status=inb(ioaddr+DAYNA_CARD_STATUS);
737 if((status&0x03)==DAYNA_RX_REQUEST)
738 cops_rx(dev);
739 netif_wake_queue(dev);
740 } while(++boguscount < 20);
741 }
742 else
743 {
744 do {
745 status=inb(ioaddr+TANG_CARD_STATUS);
746 if(status & TANG_RX_READY)
747 cops_rx(dev);
748 if(status & TANG_TX_READY)
749 netif_wake_queue(dev);
750 status=inb(ioaddr+TANG_CARD_STATUS);
751 } while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
752 }
753
754 return IRQ_HANDLED;
755}
756
757/*
758 * We have a good packet(s), get it/them out of the buffers.
759 */
760static void cops_rx(struct net_device *dev)
761{
762 int pkt_len = 0;
763 int rsp_type = 0;
764 struct sk_buff *skb = NULL;
765 struct cops_local *lp = netdev_priv(dev);
766 int ioaddr = dev->base_addr;
767 int boguscount = 0;
768 unsigned long flags;
769
770
771 spin_lock_irqsave(&lp->lock, flags);
772
773 if(lp->board==DAYNA)
774 {
775 outb(0, ioaddr); /* Send out Zero length. */
776 outb(0, ioaddr);
777 outb(DATA_READ, ioaddr); /* Send read command out. */
778
779 /* Wait for DMA to turn around. */
780 while(++boguscount<1000000)
781 {
782 barrier();
783 if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_READY)
784 break;
785 }
786
787 if(boguscount==1000000)
788 {
789 printk(KERN_WARNING "%s: DMA timed out.\n",dev->name);
790 spin_unlock_irqrestore(&lp->lock, flags);
791 return;
792 }
793 }
794
795 /* Get response length. */
796 if(lp->board==DAYNA)
797 pkt_len = inb(ioaddr) & 0xFF;
798 else
799 pkt_len = inb(ioaddr) & 0x00FF;
800 pkt_len |= (inb(ioaddr) << 8);
801 /* Input IO code. */
802 rsp_type=inb(ioaddr);
803
804 /* Malloc up new buffer. */
805 skb = dev_alloc_skb(pkt_len);
806 if(skb == NULL)
807 {
808 printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n",
809 dev->name);
810 lp->stats.rx_dropped++;
811 while(pkt_len--) /* Discard packet */
812 inb(ioaddr);
813 spin_unlock_irqrestore(&lp->lock, flags);
814 return;
815 }
816 skb->dev = dev;
817 skb_put(skb, pkt_len);
818 skb->protocol = htons(ETH_P_LOCALTALK);
819
820 insb(ioaddr, skb->data, pkt_len); /* Eat the Data */
821
822 if(lp->board==DAYNA)
823 outb(1, ioaddr+DAYNA_INT_CARD); /* Interrupt the card */
824
825 spin_unlock_irqrestore(&lp->lock, flags); /* Restore interrupts. */
826
827 /* Check for bad response length */
828 if(pkt_len < 0 || pkt_len > MAX_LLAP_SIZE)
829 {
830 printk(KERN_WARNING "%s: Bad packet length of %d bytes.\n",
831 dev->name, pkt_len);
832 lp->stats.tx_errors++;
833 dev_kfree_skb_any(skb);
834 return;
835 }
836
837 /* Set nodeid and then get out. */
838 if(rsp_type == LAP_INIT_RSP)
839 { /* Nodeid taken from received packet. */
840 lp->node_acquire = skb->data[0];
841 dev_kfree_skb_any(skb);
842 return;
843 }
844
845 /* One last check to make sure we have a good packet. */
846 if(rsp_type != LAP_RESPONSE)
847 {
848 printk(KERN_WARNING "%s: Bad packet type %d.\n", dev->name, rsp_type);
849 lp->stats.tx_errors++;
850 dev_kfree_skb_any(skb);
851 return;
852 }
853
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700854 skb_reset_mac_header(skb); /* Point to entire packet. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 skb_pull(skb,3);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300856 skb_reset_transport_header(skb); /* Point to data (Skip header). */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 /* Update the counters. */
859 lp->stats.rx_packets++;
860 lp->stats.rx_bytes += skb->len;
861
862 /* Send packet to a higher place. */
863 netif_rx(skb);
864 dev->last_rx = jiffies;
865}
866
867static void cops_timeout(struct net_device *dev)
868{
869 struct cops_local *lp = netdev_priv(dev);
870 int ioaddr = dev->base_addr;
871
872 lp->stats.tx_errors++;
873 if(lp->board==TANGENT)
874 {
875 if((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
876 printk(KERN_WARNING "%s: No TX complete interrupt.\n", dev->name);
877 }
878 printk(KERN_WARNING "%s: Transmit timed out.\n", dev->name);
879 cops_jumpstart(dev); /* Restart the card. */
880 dev->trans_start = jiffies;
881 netif_wake_queue(dev);
882}
883
884
885/*
886 * Make the card transmit a LocalTalk packet.
887 */
888
889static int cops_send_packet(struct sk_buff *skb, struct net_device *dev)
890{
891 struct cops_local *lp = netdev_priv(dev);
892 int ioaddr = dev->base_addr;
893 unsigned long flags;
894
895 /*
896 * Block a timer-based transmit from overlapping.
897 */
898
899 netif_stop_queue(dev);
900
901 spin_lock_irqsave(&lp->lock, flags);
902 if(lp->board == DAYNA) /* Wait for adapter transmit buffer. */
903 while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
904 cpu_relax();
905 if(lp->board == TANGENT) /* Wait for adapter transmit buffer. */
906 while((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
907 cpu_relax();
908
909 /* Output IO length. */
910 outb(skb->len, ioaddr);
911 if(lp->board == DAYNA)
912 outb(skb->len >> 8, ioaddr);
913 else
914 outb((skb->len >> 8)&0x0FF, ioaddr);
915
916 /* Output IO code. */
917 outb(LAP_WRITE, ioaddr);
918
919 if(lp->board == DAYNA) /* Check the transmit buffer again. */
920 while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0);
921
922 outsb(ioaddr, skb->data, skb->len); /* Send out the data. */
923
924 if(lp->board==DAYNA) /* Dayna requires you kick the card */
925 outb(1, ioaddr+DAYNA_INT_CARD);
926
927 spin_unlock_irqrestore(&lp->lock, flags); /* Restore interrupts. */
928
929 /* Done sending packet, update counters and cleanup. */
930 lp->stats.tx_packets++;
931 lp->stats.tx_bytes += skb->len;
932 dev->trans_start = jiffies;
933 dev_kfree_skb (skb);
934 return 0;
935}
936
937/*
938 * Dummy function to keep the Appletalk layer happy.
939 */
940
941static void set_multicast_list(struct net_device *dev)
942{
943 if(cops_debug >= 3)
944 printk("%s: set_multicast_list executed\n", dev->name);
945}
946
947/*
948 * Another Dummy function to keep the Appletalk layer happy.
949 */
950
951static int cops_hard_header(struct sk_buff *skb, struct net_device *dev,
952 unsigned short type, void *daddr, void *saddr,
953 unsigned len)
954{
955 if(cops_debug >= 3)
956 printk("%s: cops_hard_header executed. Wow!\n", dev->name);
957 return 0;
958}
959
960/*
961 * System ioctls for the COPS LocalTalk card.
962 */
963
964static int cops_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
965{
966 struct cops_local *lp = netdev_priv(dev);
967 struct sockaddr_at *sa = (struct sockaddr_at *)&ifr->ifr_addr;
968 struct atalk_addr *aa = (struct atalk_addr *)&lp->node_addr;
969
970 switch(cmd)
971 {
972 case SIOCSIFADDR:
973 /* Get and set the nodeid and network # atalkd wants. */
974 cops_nodeid(dev, sa->sat_addr.s_node);
975 aa->s_net = sa->sat_addr.s_net;
976 aa->s_node = lp->node_acquire;
977
978 /* Set broardcast address. */
979 dev->broadcast[0] = 0xFF;
980
981 /* Set hardware address. */
982 dev->dev_addr[0] = aa->s_node;
983 dev->addr_len = 1;
984 return 0;
985
986 case SIOCGIFADDR:
987 sa->sat_addr.s_net = aa->s_net;
988 sa->sat_addr.s_node = aa->s_node;
989 return 0;
990
991 default:
992 return -EOPNOTSUPP;
993 }
994}
995
996/*
997 * The inverse routine to cops_open().
998 */
999
1000static int cops_close(struct net_device *dev)
1001{
1002 struct cops_local *lp = netdev_priv(dev);
1003
1004 /* If we were running polled, yank the timer.
1005 */
1006 if(lp->board==TANGENT && dev->irq==0)
1007 del_timer(&cops_timer);
1008
1009 netif_stop_queue(dev);
1010 return 0;
1011}
1012
1013/*
1014 * Get the current statistics.
1015 * This may be called with the card open or closed.
1016 */
1017static struct net_device_stats *cops_get_stats(struct net_device *dev)
1018{
1019 struct cops_local *lp = netdev_priv(dev);
1020 return &lp->stats;
1021}
1022
1023#ifdef MODULE
1024static struct net_device *cops_dev;
1025
1026MODULE_LICENSE("GPL");
1027module_param(io, int, 0);
1028module_param(irq, int, 0);
1029module_param(board_type, int, 0);
1030
Andrew Morton5f3bc452006-08-14 22:59:58 -07001031int __init init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032{
1033 if (io == 0)
1034 printk(KERN_WARNING "%s: You shouldn't autoprobe with insmod\n",
1035 cardname);
1036 cops_dev = cops_probe(-1);
1037 if (IS_ERR(cops_dev))
1038 return PTR_ERR(cops_dev);
1039 return 0;
1040}
1041
Al Viroafc8eb42006-06-14 18:50:53 -04001042void __exit cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043{
1044 unregister_netdev(cops_dev);
1045 cleanup_card(cops_dev);
1046 free_netdev(cops_dev);
1047}
1048#endif /* MODULE */
1049
1050/*
1051 * Local variables:
1052 * compile-command: "gcc -DMODVERSIONS -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -c cops.c"
1053 * c-basic-offset: 4
1054 * c-file-offsets: ((substatement-open . 0))
1055 * End:
1056 */