1 /*** ltpc.c -- a driver for the LocalTalk PC card.
2 *
3 * Copyright (c) 1995,1996 Bradford W. Johnson <johns393@maroon.tc.umn.edu>
4 *
5 * This software may be used and distributed according to the terms
6 * of the GNU General Public License, incorporated herein by reference.
7 *
8 * This is ALPHA code at best. It may not work for you. It may
9 * damage your equipment. It may damage your relations with other
10 * users of your network. Use it at your own risk!
11 *
12 * Based in part on:
13 * skeleton.c by Donald Becker
14 * dummy.c by Nick Holloway and Alan Cox
15 * loopback.c by Ross Biro, Fred van Kampen, Donald Becker
16 * the netatalk source code (UMICH)
17 * lots of work on the card...
18 *
19 * I do not have access to the (proprietary) SDK that goes with the card.
20 * If you do, I don't want to know about it, and you can probably write
21 * a better driver yourself anyway. This does mean that the pieces that
22 * talk to the card are guesswork on my part, so use at your own risk!
23 *
24 * This is my first try at writing Linux networking code, and is also
25 * guesswork. Again, use at your own risk! (Although on this part, I'd
26 * welcome suggestions)
27 *
28 * This is a loadable kernel module which seems to work at my site
29 * consisting of a 1.2.13 linux box running netatalk 1.3.3, and with
30 * the kernel support from 1.3.3b2 including patches routing.patch
31 * and ddp.disappears.from.chooser. In order to run it, you will need
32 * to patch ddp.c and aarp.c in the kernel, but only a little...
33 *
34 * I'm fairly confident that while this is arguably badly written, the
35 * problems that people experience will be "higher level", that is, with
36 * complications in the netatalk code. The driver itself doesn't do
37 * anything terribly complicated -- it pretends to be an ether device
38 * as far as netatalk is concerned, strips the DDP data out of the ether
39 * frame and builds a LLAP packet to send out the card. In the other
40 * direction, it receives LLAP frames from the card and builds a fake
41 * ether packet that it then tosses up to the networking code. You can
42 * argue (correctly) that this is an ugly way to do things, but it
43 * requires a minimal amount of fooling with the code in ddp.c and aarp.c.
44 *
45 * The card will do a lot more than is used here -- I *think* it has the
46 * layers up through ATP. Even if you knew how that part works (which I
47 * don't) it would be a big job to carve up the kernel ddp code to insert
48 * things at a higher level, and probably a bad idea...
49 *
50 * There are a number of other cards that do LocalTalk on the PC. If
51 * nobody finds any insurmountable (at the netatalk level) problems
52 * here, this driver should encourage people to put some work into the
53 * other cards (some of which I gather are still commercially available)
54 * and also to put hooks for LocalTalk into the official ddp code.
55 *
56 * I welcome comments and suggestions. This is my first try at Linux
57 * networking stuff, and there are probably lots of things that I did
58 * suboptimally.
59 *
60 ***/
61
62 /***
63 *
64 * $Log: ltpc.c,v $
65 * Revision 1.1.2.1 2000/03/01 05:35:07 jgarzik
66 * at and tr cleanup
67 *
68 * Revision 1.8 1997/01/28 05:44:54 bradford
69 * Clean up for non-module a little.
70 * Hacked about a bit to clean things up - Alan Cox
71 * Probably broken it from the origina 1.8
72 *
73
74 * 1998/11/09: David Huggins-Daines <dhd@debian.org>
75 * Cleaned up the initialization code to use the standard autoirq methods,
76 and to probe for things in the standard order of i/o, irq, dma. This
77 removes the "reset the reset" hack, because I couldn't figure out an
78 easy way to get the card to trigger an interrupt after it.
79 * Added support for passing configuration parameters on the kernel command
80 line and through insmod
81 * Changed the device name from "ltalk0" to "lt0", both to conform with the
82 other localtalk driver, and to clear up the inconsistency between the
83 module and the non-module versions of the driver :-)
84 * Added a bunch of comments (I was going to make some enums for the state
85 codes and the register offsets, but I'm still not sure exactly what their
86 semantics are)
87 * Don't poll anymore in interrupt-driven mode
88 * It seems to work as a module now (as of 2.1.127), but I don't think
89 I'm responsible for that...
90
91 *
92 * Revision 1.7 1996/12/12 03:42:33 bradford
93 * DMA alloc cribbed from 3c505.c.
94 *
95 * Revision 1.6 1996/12/12 03:18:58 bradford
96 * Added virt_to_bus; works in 2.1.13.
97 *
98 * Revision 1.5 1996/12/12 03:13:22 root
99 * xmitQel initialization -- think through better though.
100 *
101 * Revision 1.4 1996/06/18 14:55:55 root
102 * Change names to ltpc. Tabs. Took a shot at dma alloc,
103 * although more needs to be done eventually.
104 *
105 * Revision 1.3 1996/05/22 14:59:39 root
106 * Change dev->open, dev->close to track dummy.c in 1.99.(around 7)
107 *
108 * Revision 1.2 1996/05/22 14:58:24 root
109 * Change tabs mostly.
110 *
111 * Revision 1.1 1996/04/23 04:45:09 root
112 * Initial revision
113 *
114 * Revision 0.16 1996/03/05 15:59:56 root
115 * Change ARPHRD_LOCALTLK definition to the "real" one.
116 *
117 * Revision 0.15 1996/03/05 06:28:30 root
118 * Changes for kernel 1.3.70. Still need a few patches to kernel, but
119 * it's getting closer.
120 *
121 * Revision 0.14 1996/02/25 17:38:32 root
122 * More cleanups. Removed query to card on get_stats.
123 *
124 * Revision 0.13 1996/02/21 16:27:40 root
125 * Refix debug_print_skb. Fix mac.raw gotcha that appeared in 1.3.65.
126 * Clean up receive code a little.
127 *
128 * Revision 0.12 1996/02/19 16:34:53 root
129 * Fix debug_print_skb. Kludge outgoing snet to 0 when using startup
130 * range. Change debug to mask: 1 for verbose, 2 for higher level stuff
131 * including packet printing, 4 for lower level (card i/o) stuff.
132 *
133 * Revision 0.11 1996/02/12 15:53:38 root
134 * Added router sends (requires new aarp.c patch)
135 *
136 * Revision 0.10 1996/02/11 00:19:35 root
137 * Change source LTALK_LOGGING debug switch to insmod ... debug=2.
138 *
139 * Revision 0.9 1996/02/10 23:59:35 root
140 * Fixed those fixes for 1.2 -- DANGER! The at.h that comes with netatalk
141 * has a *different* definition of struct sockaddr_at than the Linux kernel
142 * does. This is an "insidious and invidious" bug...
143 * (Actually the preceding comment is false -- it's the atalk.h in the
144 * ancient atalk-0.06 that's the problem)
145 *
146 * Revision 0.8 1996/02/10 19:09:00 root
147 * Merge 1.3 changes. Tested OK under 1.3.60.
148 *
149 * Revision 0.7 1996/02/10 17:56:56 root
150 * Added debug=1 parameter on insmod for debugging prints. Tried
151 * to fix timer unload on rmmod, but I don't think that's the problem.
152 *
153 * Revision 0.6 1995/12/31 19:01:09 root
154 * Clean up rmmod, irq comments per feedback from Corin Anderson (Thanks Corey!)
155 * Clean up initial probing -- sometimes the card wakes up latched in reset.
156 *
157 * Revision 0.5 1995/12/22 06:03:44 root
158 * Added comments in front and cleaned up a bit.
159 * This version sent out to people.
160 *
161 * Revision 0.4 1995/12/18 03:46:44 root
162 * Return shortDDP to longDDP fake to 0/0. Added command structs.
163 *
164 ***/
165
166 /* ltpc jumpers are:
167 *
168 * Interrupts -- set at most one. If none are set, the driver uses
169 * polled mode. Because the card was developed in the XT era, the
170 * original documentation refers to IRQ2. Since you'll be running
171 * this on an AT (or later) class machine, that really means IRQ9.
172 *
173 * SW1 IRQ 4
174 * SW2 IRQ 3
175 * SW3 IRQ 9 (2 in original card documentation only applies to XT)
176 *
177 *
178 * DMA -- choose DMA 1 or 3, and set both corresponding switches.
179 *
180 * SW4 DMA 3
181 * SW5 DMA 1
182 * SW6 DMA 3
183 * SW7 DMA 1
184 *
185 *
186 * I/O address -- choose one.
187 *
188 * SW8 220 / 240
189 */
190
191 /* To have some stuff logged, do
192 * insmod ltpc.o debug=1
193 *
194 * For a whole bunch of stuff, use higher numbers.
195 *
196 * The default is 0, i.e. no messages except for the probe results.
197 */
198
199 /* insmod-tweakable variables */
200 static int debug;
201 #define DEBUG_VERBOSE 1
202 #define DEBUG_UPPER 2
203 #define DEBUG_LOWER 4
204
205 static int io;
206 static int irq;
207 static int dma;
208
209 #include <linux/module.h>
210 #include <linux/kernel.h>
211 #include <linux/types.h>
212 #include <linux/fcntl.h>
213 #include <linux/interrupt.h>
214 #include <linux/ptrace.h>
215 #include <linux/ioport.h>
216 #include <linux/spinlock.h>
217 #include <linux/in.h>
218 #include <linux/string.h>
219 #include <linux/errno.h>
220 #include <linux/init.h>
221 #include <linux/netdevice.h>
222 #include <linux/etherdevice.h>
223 #include <linux/skbuff.h>
224 #include <linux/if_arp.h>
225 #include <linux/if_ltalk.h>
226 #include <linux/delay.h>
227 #include <linux/timer.h>
228 #include <linux/atalk.h>
229 #include <linux/bitops.h>
230 #include <linux/gfp.h>
231
232 #include <asm/system.h>
233 #include <asm/dma.h>
234 #include <asm/io.h>
235
236 /* our stuff */
237 #include "ltpc.h"
238
239 static DEFINE_SPINLOCK(txqueue_lock);
240 static DEFINE_SPINLOCK(mbox_lock);
241
242 /* function prototypes */
243 static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
244 void *dbuf, int dbuflen);
245 static int sendup_buffer (struct net_device *dev);
246
247 /* Dma Memory related stuff, cribbed directly from 3c505.c */
248
dma_mem_alloc(int size)249 static unsigned long dma_mem_alloc(int size)
250 {
251 int order = get_order(size);
252
253 return __get_dma_pages(GFP_KERNEL, order);
254 }
255
256 /* DMA data buffer, DMA command buffer */
257 static unsigned char *ltdmabuf;
258 static unsigned char *ltdmacbuf;
259
260 /* private struct, holds our appletalk address */
261
262 struct ltpc_private
263 {
264 struct atalk_addr my_addr;
265 };
266
267 /* transmit queue element struct */
268
269 struct xmitQel {
270 struct xmitQel *next;
271 /* command buffer */
272 unsigned char *cbuf;
273 short cbuflen;
274 /* data buffer */
275 unsigned char *dbuf;
276 short dbuflen;
277 unsigned char QWrite; /* read or write data */
278 unsigned char mailbox;
279 };
280
281 /* the transmit queue itself */
282
283 static struct xmitQel *xmQhd, *xmQtl;
284
enQ(struct xmitQel * qel)285 static void enQ(struct xmitQel *qel)
286 {
287 unsigned long flags;
288 qel->next = NULL;
289
290 spin_lock_irqsave(&txqueue_lock, flags);
291 if (xmQtl) {
292 xmQtl->next = qel;
293 } else {
294 xmQhd = qel;
295 }
296 xmQtl = qel;
297 spin_unlock_irqrestore(&txqueue_lock, flags);
298
299 if (debug & DEBUG_LOWER)
300 printk("enqueued a 0x%02x command\n",qel->cbuf[0]);
301 }
302
deQ(void)303 static struct xmitQel *deQ(void)
304 {
305 unsigned long flags;
306 int i;
307 struct xmitQel *qel=NULL;
308
309 spin_lock_irqsave(&txqueue_lock, flags);
310 if (xmQhd) {
311 qel = xmQhd;
312 xmQhd = qel->next;
313 if(!xmQhd) xmQtl = NULL;
314 }
315 spin_unlock_irqrestore(&txqueue_lock, flags);
316
317 if ((debug & DEBUG_LOWER) && qel) {
318 int n;
319 printk(KERN_DEBUG "ltpc: dequeued command ");
320 n = qel->cbuflen;
321 if (n>100) n=100;
322 for(i=0;i<n;i++) printk("%02x ",qel->cbuf[i]);
323 printk("\n");
324 }
325
326 return qel;
327 }
328
329 /* and... the queue elements we'll be using */
330 static struct xmitQel qels[16];
331
332 /* and their corresponding mailboxes */
333 static unsigned char mailbox[16];
334 static unsigned char mboxinuse[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
335
wait_timeout(struct net_device * dev,int c)336 static int wait_timeout(struct net_device *dev, int c)
337 {
338 /* returns true if it stayed c */
339 /* this uses base+6, but it's ok */
340 int i;
341
342 /* twenty second or so total */
343
344 for(i=0;i<200000;i++) {
345 if ( c != inb_p(dev->base_addr+6) ) return 0;
346 udelay(100);
347 }
348 return 1; /* timed out */
349 }
350
351 /* get the first free mailbox */
352
getmbox(void)353 static int getmbox(void)
354 {
355 unsigned long flags;
356 int i;
357
358 spin_lock_irqsave(&mbox_lock, flags);
359 for(i=1;i<16;i++) if(!mboxinuse[i]) {
360 mboxinuse[i]=1;
361 spin_unlock_irqrestore(&mbox_lock, flags);
362 return i;
363 }
364 spin_unlock_irqrestore(&mbox_lock, flags);
365 return 0;
366 }
367
368 /* read a command from the card */
handlefc(struct net_device * dev)369 static void handlefc(struct net_device *dev)
370 {
371 /* called *only* from idle, non-reentrant */
372 int dma = dev->dma;
373 int base = dev->base_addr;
374 unsigned long flags;
375
376
377 flags=claim_dma_lock();
378 disable_dma(dma);
379 clear_dma_ff(dma);
380 set_dma_mode(dma,DMA_MODE_READ);
381 set_dma_addr(dma,virt_to_bus(ltdmacbuf));
382 set_dma_count(dma,50);
383 enable_dma(dma);
384 release_dma_lock(flags);
385
386 inb_p(base+3);
387 inb_p(base+2);
388
389 if ( wait_timeout(dev,0xfc) ) printk("timed out in handlefc\n");
390 }
391
392 /* read data from the card */
handlefd(struct net_device * dev)393 static void handlefd(struct net_device *dev)
394 {
395 int dma = dev->dma;
396 int base = dev->base_addr;
397 unsigned long flags;
398
399 flags=claim_dma_lock();
400 disable_dma(dma);
401 clear_dma_ff(dma);
402 set_dma_mode(dma,DMA_MODE_READ);
403 set_dma_addr(dma,virt_to_bus(ltdmabuf));
404 set_dma_count(dma,800);
405 enable_dma(dma);
406 release_dma_lock(flags);
407
408 inb_p(base+3);
409 inb_p(base+2);
410
411 if ( wait_timeout(dev,0xfd) ) printk("timed out in handlefd\n");
412 sendup_buffer(dev);
413 }
414
handlewrite(struct net_device * dev)415 static void handlewrite(struct net_device *dev)
416 {
417 /* called *only* from idle, non-reentrant */
418 /* on entry, 0xfb and ltdmabuf holds data */
419 int dma = dev->dma;
420 int base = dev->base_addr;
421 unsigned long flags;
422
423 flags=claim_dma_lock();
424 disable_dma(dma);
425 clear_dma_ff(dma);
426 set_dma_mode(dma,DMA_MODE_WRITE);
427 set_dma_addr(dma,virt_to_bus(ltdmabuf));
428 set_dma_count(dma,800);
429 enable_dma(dma);
430 release_dma_lock(flags);
431
432 inb_p(base+3);
433 inb_p(base+2);
434
435 if ( wait_timeout(dev,0xfb) ) {
436 flags=claim_dma_lock();
437 printk("timed out in handlewrite, dma res %d\n",
438 get_dma_residue(dev->dma) );
439 release_dma_lock(flags);
440 }
441 }
442
handleread(struct net_device * dev)443 static void handleread(struct net_device *dev)
444 {
445 /* on entry, 0xfb */
446 /* on exit, ltdmabuf holds data */
447 int dma = dev->dma;
448 int base = dev->base_addr;
449 unsigned long flags;
450
451
452 flags=claim_dma_lock();
453 disable_dma(dma);
454 clear_dma_ff(dma);
455 set_dma_mode(dma,DMA_MODE_READ);
456 set_dma_addr(dma,virt_to_bus(ltdmabuf));
457 set_dma_count(dma,800);
458 enable_dma(dma);
459 release_dma_lock(flags);
460
461 inb_p(base+3);
462 inb_p(base+2);
463 if ( wait_timeout(dev,0xfb) ) printk("timed out in handleread\n");
464 }
465
handlecommand(struct net_device * dev)466 static void handlecommand(struct net_device *dev)
467 {
468 /* on entry, 0xfa and ltdmacbuf holds command */
469 int dma = dev->dma;
470 int base = dev->base_addr;
471 unsigned long flags;
472
473 flags=claim_dma_lock();
474 disable_dma(dma);
475 clear_dma_ff(dma);
476 set_dma_mode(dma,DMA_MODE_WRITE);
477 set_dma_addr(dma,virt_to_bus(ltdmacbuf));
478 set_dma_count(dma,50);
479 enable_dma(dma);
480 release_dma_lock(flags);
481 inb_p(base+3);
482 inb_p(base+2);
483 if ( wait_timeout(dev,0xfa) ) printk("timed out in handlecommand\n");
484 }
485
486 /* ready made command for getting the result from the card */
487 static unsigned char rescbuf[2] = {LT_GETRESULT,0};
488 static unsigned char resdbuf[2];
489
490 static int QInIdle;
491
492 /* idle expects to be called with the IRQ line high -- either because of
493 * an interrupt, or because the line is tri-stated
494 */
495
idle(struct net_device * dev)496 static void idle(struct net_device *dev)
497 {
498 unsigned long flags;
499 int state;
500 /* FIXME This is initialized to shut the warning up, but I need to
501 * think this through again.
502 */
503 struct xmitQel *q = NULL;
504 int oops;
505 int i;
506 int base = dev->base_addr;
507
508 spin_lock_irqsave(&txqueue_lock, flags);
509 if(QInIdle) {
510 spin_unlock_irqrestore(&txqueue_lock, flags);
511 return;
512 }
513 QInIdle = 1;
514 spin_unlock_irqrestore(&txqueue_lock, flags);
515
516 /* this tri-states the IRQ line */
517 (void) inb_p(base+6);
518
519 oops = 100;
520
521 loop:
522 if (0>oops--) {
523 printk("idle: looped too many times\n");
524 goto done;
525 }
526
527 state = inb_p(base+6);
528 if (state != inb_p(base+6)) goto loop;
529
530 switch(state) {
531 case 0xfc:
532 /* incoming command */
533 if (debug & DEBUG_LOWER) printk("idle: fc\n");
534 handlefc(dev);
535 break;
536 case 0xfd:
537 /* incoming data */
538 if(debug & DEBUG_LOWER) printk("idle: fd\n");
539 handlefd(dev);
540 break;
541 case 0xf9:
542 /* result ready */
543 if (debug & DEBUG_LOWER) printk("idle: f9\n");
544 if(!mboxinuse[0]) {
545 mboxinuse[0] = 1;
546 qels[0].cbuf = rescbuf;
547 qels[0].cbuflen = 2;
548 qels[0].dbuf = resdbuf;
549 qels[0].dbuflen = 2;
550 qels[0].QWrite = 0;
551 qels[0].mailbox = 0;
552 enQ(&qels[0]);
553 }
554 inb_p(dev->base_addr+1);
555 inb_p(dev->base_addr+0);
556 if( wait_timeout(dev,0xf9) )
557 printk("timed out idle f9\n");
558 break;
559 case 0xf8:
560 /* ?? */
561 if (xmQhd) {
562 inb_p(dev->base_addr+1);
563 inb_p(dev->base_addr+0);
564 if(wait_timeout(dev,0xf8) )
565 printk("timed out idle f8\n");
566 } else {
567 goto done;
568 }
569 break;
570 case 0xfa:
571 /* waiting for command */
572 if(debug & DEBUG_LOWER) printk("idle: fa\n");
573 if (xmQhd) {
574 q=deQ();
575 memcpy(ltdmacbuf,q->cbuf,q->cbuflen);
576 ltdmacbuf[1] = q->mailbox;
577 if (debug>1) {
578 int n;
579 printk("ltpc: sent command ");
580 n = q->cbuflen;
581 if (n>100) n=100;
582 for(i=0;i<n;i++)
583 printk("%02x ",ltdmacbuf[i]);
584 printk("\n");
585 }
586 handlecommand(dev);
587 if(0xfa==inb_p(base+6)) {
588 /* we timed out, so return */
589 goto done;
590 }
591 } else {
592 /* we don't seem to have a command */
593 if (!mboxinuse[0]) {
594 mboxinuse[0] = 1;
595 qels[0].cbuf = rescbuf;
596 qels[0].cbuflen = 2;
597 qels[0].dbuf = resdbuf;
598 qels[0].dbuflen = 2;
599 qels[0].QWrite = 0;
600 qels[0].mailbox = 0;
601 enQ(&qels[0]);
602 } else {
603 printk("trouble: response command already queued\n");
604 goto done;
605 }
606 }
607 break;
608 case 0Xfb:
609 /* data transfer ready */
610 if(debug & DEBUG_LOWER) printk("idle: fb\n");
611 if(q->QWrite) {
612 memcpy(ltdmabuf,q->dbuf,q->dbuflen);
613 handlewrite(dev);
614 } else {
615 handleread(dev);
616 /* non-zero mailbox numbers are for
617 commmands, 0 is for GETRESULT
618 requests */
619 if(q->mailbox) {
620 memcpy(q->dbuf,ltdmabuf,q->dbuflen);
621 } else {
622 /* this was a result */
623 mailbox[ 0x0f & ltdmabuf[0] ] = ltdmabuf[1];
624 mboxinuse[0]=0;
625 }
626 }
627 break;
628 }
629 goto loop;
630
631 done:
632 QInIdle=0;
633
634 /* now set the interrupts back as appropriate */
635 /* the first read takes it out of tri-state (but still high) */
636 /* the second resets it */
637 /* note that after this point, any read of base+6 will
638 trigger an interrupt */
639
640 if (dev->irq) {
641 inb_p(base+7);
642 inb_p(base+7);
643 }
644 }
645
646
do_write(struct net_device * dev,void * cbuf,int cbuflen,void * dbuf,int dbuflen)647 static int do_write(struct net_device *dev, void *cbuf, int cbuflen,
648 void *dbuf, int dbuflen)
649 {
650
651 int i = getmbox();
652 int ret;
653
654 if(i) {
655 qels[i].cbuf = cbuf;
656 qels[i].cbuflen = cbuflen;
657 qels[i].dbuf = dbuf;
658 qels[i].dbuflen = dbuflen;
659 qels[i].QWrite = 1;
660 qels[i].mailbox = i; /* this should be initted rather */
661 enQ(&qels[i]);
662 idle(dev);
663 ret = mailbox[i];
664 mboxinuse[i]=0;
665 return ret;
666 }
667 printk("ltpc: could not allocate mbox\n");
668 return -1;
669 }
670
do_read(struct net_device * dev,void * cbuf,int cbuflen,void * dbuf,int dbuflen)671 static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
672 void *dbuf, int dbuflen)
673 {
674
675 int i = getmbox();
676 int ret;
677
678 if(i) {
679 qels[i].cbuf = cbuf;
680 qels[i].cbuflen = cbuflen;
681 qels[i].dbuf = dbuf;
682 qels[i].dbuflen = dbuflen;
683 qels[i].QWrite = 0;
684 qels[i].mailbox = i; /* this should be initted rather */
685 enQ(&qels[i]);
686 idle(dev);
687 ret = mailbox[i];
688 mboxinuse[i]=0;
689 return ret;
690 }
691 printk("ltpc: could not allocate mbox\n");
692 return -1;
693 }
694
695 /* end of idle handlers -- what should be seen is do_read, do_write */
696
697 static struct timer_list ltpc_timer;
698
699 static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
700
read_30(struct net_device * dev)701 static int read_30 ( struct net_device *dev)
702 {
703 lt_command c;
704 c.getflags.command = LT_GETFLAGS;
705 return do_read(dev, &c, sizeof(c.getflags),&c,0);
706 }
707
set_30(struct net_device * dev,int x)708 static int set_30 (struct net_device *dev,int x)
709 {
710 lt_command c;
711 c.setflags.command = LT_SETFLAGS;
712 c.setflags.flags = x;
713 return do_write(dev, &c, sizeof(c.setflags),&c,0);
714 }
715
716 /* LLAP to DDP translation */
717
sendup_buffer(struct net_device * dev)718 static int sendup_buffer (struct net_device *dev)
719 {
720 /* on entry, command is in ltdmacbuf, data in ltdmabuf */
721 /* called from idle, non-reentrant */
722
723 int dnode, snode, llaptype, len;
724 int sklen;
725 struct sk_buff *skb;
726 struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;
727
728 if (ltc->command != LT_RCVLAP) {
729 printk("unknown command 0x%02x from ltpc card\n",ltc->command);
730 return -1;
731 }
732 dnode = ltc->dnode;
733 snode = ltc->snode;
734 llaptype = ltc->laptype;
735 len = ltc->length;
736
737 sklen = len;
738 if (llaptype == 1)
739 sklen += 8; /* correct for short ddp */
740 if(sklen > 800) {
741 printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
742 dev->name,sklen);
743 return -1;
744 }
745
746 if ( (llaptype==0) || (llaptype>2) ) {
747 printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
748 return -1;
749 }
750
751
752 skb = dev_alloc_skb(3+sklen);
753 if (skb == NULL)
754 {
755 printk("%s: dropping packet due to memory squeeze.\n",
756 dev->name);
757 return -1;
758 }
759 skb->dev = dev;
760
761 if (sklen > len)
762 skb_reserve(skb,8);
763 skb_put(skb,len+3);
764 skb->protocol = htons(ETH_P_LOCALTALK);
765 /* add LLAP header */
766 skb->data[0] = dnode;
767 skb->data[1] = snode;
768 skb->data[2] = llaptype;
769 skb_reset_mac_header(skb); /* save pointer to llap header */
770 skb_pull(skb,3);
771
772 /* copy ddp(s,e)hdr + contents */
773 skb_copy_to_linear_data(skb, ltdmabuf, len);
774
775 skb_reset_transport_header(skb);
776
777 dev->stats.rx_packets++;
778 dev->stats.rx_bytes += skb->len;
779
780 /* toss it onwards */
781 netif_rx(skb);
782 return 0;
783 }
784
785 /* the handler for the board interrupt */
786
787 static irqreturn_t
ltpc_interrupt(int irq,void * dev_id)788 ltpc_interrupt(int irq, void *dev_id)
789 {
790 struct net_device *dev = dev_id;
791
792 if (dev==NULL) {
793 printk("ltpc_interrupt: unknown device.\n");
794 return IRQ_NONE;
795 }
796
797 inb_p(dev->base_addr+6); /* disable further interrupts from board */
798
799 idle(dev); /* handle whatever is coming in */
800
801 /* idle re-enables interrupts from board */
802
803 return IRQ_HANDLED;
804 }
805
806 /***
807 *
808 * The ioctls that the driver responds to are:
809 *
810 * SIOCSIFADDR -- do probe using the passed node hint.
811 * SIOCGIFADDR -- return net, node.
812 *
813 * some of this stuff should be done elsewhere.
814 *
815 ***/
816
ltpc_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)817 static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
818 {
819 struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
820 /* we'll keep the localtalk node address in dev->pa_addr */
821 struct ltpc_private *ltpc_priv = netdev_priv(dev);
822 struct atalk_addr *aa = <pc_priv->my_addr;
823 struct lt_init c;
824 int ltflags;
825
826 if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
827
828 switch(cmd) {
829 case SIOCSIFADDR:
830
831 aa->s_net = sa->sat_addr.s_net;
832
833 /* this does the probe and returns the node addr */
834 c.command = LT_INIT;
835 c.hint = sa->sat_addr.s_node;
836
837 aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
838
839 /* get all llap frames raw */
840 ltflags = read_30(dev);
841 ltflags |= LT_FLAG_ALLLAP;
842 set_30 (dev,ltflags);
843
844 dev->broadcast[0] = 0xFF;
845 dev->dev_addr[0] = aa->s_node;
846
847 dev->addr_len=1;
848
849 return 0;
850
851 case SIOCGIFADDR:
852
853 sa->sat_addr.s_net = aa->s_net;
854 sa->sat_addr.s_node = aa->s_node;
855
856 return 0;
857
858 default:
859 return -EINVAL;
860 }
861 }
862
set_multicast_list(struct net_device * dev)863 static void set_multicast_list(struct net_device *dev)
864 {
865 /* This needs to be present to keep netatalk happy. */
866 /* Actually netatalk needs fixing! */
867 }
868
869 static int ltpc_poll_counter;
870
ltpc_poll(unsigned long l)871 static void ltpc_poll(unsigned long l)
872 {
873 struct net_device *dev = (struct net_device *) l;
874
875 del_timer(<pc_timer);
876
877 if(debug & DEBUG_VERBOSE) {
878 if (!ltpc_poll_counter) {
879 ltpc_poll_counter = 50;
880 printk("ltpc poll is alive\n");
881 }
882 ltpc_poll_counter--;
883 }
884
885 if (!dev)
886 return; /* we've been downed */
887
888 /* poll 20 times per second */
889 idle(dev);
890 ltpc_timer.expires = jiffies + HZ/20;
891
892 add_timer(<pc_timer);
893 }
894
895 /* DDP to LLAP translation */
896
ltpc_xmit(struct sk_buff * skb,struct net_device * dev)897 static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
898 {
899 /* in kernel 1.3.xx, on entry skb->data points to ddp header,
900 * and skb->len is the length of the ddp data + ddp header
901 */
902 int i;
903 struct lt_sendlap cbuf;
904 unsigned char *hdr;
905
906 cbuf.command = LT_SENDLAP;
907 cbuf.dnode = skb->data[0];
908 cbuf.laptype = skb->data[2];
909 skb_pull(skb,3); /* skip past LLAP header */
910 cbuf.length = skb->len; /* this is host order */
911 skb_reset_transport_header(skb);
912
913 if(debug & DEBUG_UPPER) {
914 printk("command ");
915 for(i=0;i<6;i++)
916 printk("%02x ",((unsigned char *)&cbuf)[i]);
917 printk("\n");
918 }
919
920 hdr = skb_transport_header(skb);
921 do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);
922
923 if(debug & DEBUG_UPPER) {
924 printk("sent %d ddp bytes\n",skb->len);
925 for (i = 0; i < skb->len; i++)
926 printk("%02x ", hdr[i]);
927 printk("\n");
928 }
929
930 dev->stats.tx_packets++;
931 dev->stats.tx_bytes += skb->len;
932
933 dev_kfree_skb(skb);
934 return NETDEV_TX_OK;
935 }
936
937 /* initialization stuff */
938
ltpc_probe_dma(int base,int dma)939 static int __init ltpc_probe_dma(int base, int dma)
940 {
941 int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
942 unsigned long timeout;
943 unsigned long f;
944
945 if (want & 1) {
946 if (request_dma(1,"ltpc")) {
947 want &= ~1;
948 } else {
949 f=claim_dma_lock();
950 disable_dma(1);
951 clear_dma_ff(1);
952 set_dma_mode(1,DMA_MODE_WRITE);
953 set_dma_addr(1,virt_to_bus(ltdmabuf));
954 set_dma_count(1,sizeof(struct lt_mem));
955 enable_dma(1);
956 release_dma_lock(f);
957 }
958 }
959 if (want & 2) {
960 if (request_dma(3,"ltpc")) {
961 want &= ~2;
962 } else {
963 f=claim_dma_lock();
964 disable_dma(3);
965 clear_dma_ff(3);
966 set_dma_mode(3,DMA_MODE_WRITE);
967 set_dma_addr(3,virt_to_bus(ltdmabuf));
968 set_dma_count(3,sizeof(struct lt_mem));
969 enable_dma(3);
970 release_dma_lock(f);
971 }
972 }
973 /* set up request */
974
975 /* FIXME -- do timings better! */
976
977 ltdmabuf[0] = LT_READMEM;
978 ltdmabuf[1] = 1; /* mailbox */
979 ltdmabuf[2] = 0; ltdmabuf[3] = 0; /* address */
980 ltdmabuf[4] = 0; ltdmabuf[5] = 1; /* read 0x0100 bytes */
981 ltdmabuf[6] = 0; /* dunno if this is necessary */
982
983 inb_p(io+1);
984 inb_p(io+0);
985 timeout = jiffies+100*HZ/100;
986 while(time_before(jiffies, timeout)) {
987 if ( 0xfa == inb_p(io+6) ) break;
988 }
989
990 inb_p(io+3);
991 inb_p(io+2);
992 while(time_before(jiffies, timeout)) {
993 if ( 0xfb == inb_p(io+6) ) break;
994 }
995
996 /* release the other dma channel (if we opened both of them) */
997
998 if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
999 want &= ~2;
1000 free_dma(3);
1001 }
1002
1003 if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
1004 want &= ~1;
1005 free_dma(1);
1006 }
1007
1008 if (!want)
1009 return 0;
1010
1011 return (want & 2) ? 3 : 1;
1012 }
1013
1014 static const struct net_device_ops ltpc_netdev = {
1015 .ndo_start_xmit = ltpc_xmit,
1016 .ndo_do_ioctl = ltpc_ioctl,
1017 .ndo_set_rx_mode = set_multicast_list,
1018 };
1019
ltpc_probe(void)1020 struct net_device * __init ltpc_probe(void)
1021 {
1022 struct net_device *dev;
1023 int err = -ENOMEM;
1024 int x=0,y=0;
1025 int autoirq;
1026 unsigned long f;
1027 unsigned long timeout;
1028
1029 dev = alloc_ltalkdev(sizeof(struct ltpc_private));
1030 if (!dev)
1031 goto out;
1032
1033 /* probe for the I/O port address */
1034
1035 if (io != 0x240 && request_region(0x220,8,"ltpc")) {
1036 x = inb_p(0x220+6);
1037 if ( (x!=0xff) && (x>=0xf0) ) {
1038 io = 0x220;
1039 goto got_port;
1040 }
1041 release_region(0x220,8);
1042 }
1043 if (io != 0x220 && request_region(0x240,8,"ltpc")) {
1044 y = inb_p(0x240+6);
1045 if ( (y!=0xff) && (y>=0xf0) ){
1046 io = 0x240;
1047 goto got_port;
1048 }
1049 release_region(0x240,8);
1050 }
1051
1052 /* give up in despair */
1053 printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
1054 err = -ENODEV;
1055 goto out1;
1056
1057 got_port:
1058 /* probe for the IRQ line */
1059 if (irq < 2) {
1060 unsigned long irq_mask;
1061
1062 irq_mask = probe_irq_on();
1063 /* reset the interrupt line */
1064 inb_p(io+7);
1065 inb_p(io+7);
1066 /* trigger an interrupt (I hope) */
1067 inb_p(io+6);
1068 mdelay(2);
1069 autoirq = probe_irq_off(irq_mask);
1070
1071 if (autoirq == 0) {
1072 printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
1073 } else {
1074 irq = autoirq;
1075 }
1076 }
1077
1078 /* allocate a DMA buffer */
1079 ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
1080 if (!ltdmabuf) {
1081 printk(KERN_ERR "ltpc: mem alloc failed\n");
1082 err = -ENOMEM;
1083 goto out2;
1084 }
1085
1086 ltdmacbuf = <dmabuf[800];
1087
1088 if(debug & DEBUG_VERBOSE) {
1089 printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
1090 }
1091
1092 /* reset the card */
1093
1094 inb_p(io+1);
1095 inb_p(io+3);
1096
1097 msleep(20);
1098
1099 inb_p(io+0);
1100 inb_p(io+2);
1101 inb_p(io+7); /* clear reset */
1102 inb_p(io+4);
1103 inb_p(io+5);
1104 inb_p(io+5); /* enable dma */
1105 inb_p(io+6); /* tri-state interrupt line */
1106
1107 ssleep(1);
1108
1109 /* now, figure out which dma channel we're using, unless it's
1110 already been specified */
1111 /* well, 0 is a legal DMA channel, but the LTPC card doesn't
1112 use it... */
1113 dma = ltpc_probe_dma(io, dma);
1114 if (!dma) { /* no dma channel */
1115 printk(KERN_ERR "No DMA channel found on ltpc card.\n");
1116 err = -ENODEV;
1117 goto out3;
1118 }
1119
1120 /* print out friendly message */
1121 if(irq)
1122 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
1123 else
1124 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d. Using polled mode.\n",io,dma);
1125
1126 dev->netdev_ops = <pc_netdev;
1127 dev->base_addr = io;
1128 dev->irq = irq;
1129 dev->dma = dma;
1130
1131 /* the card will want to send a result at this point */
1132 /* (I think... leaving out this part makes the kernel crash,
1133 so I put it back in...) */
1134
1135 f=claim_dma_lock();
1136 disable_dma(dma);
1137 clear_dma_ff(dma);
1138 set_dma_mode(dma,DMA_MODE_READ);
1139 set_dma_addr(dma,virt_to_bus(ltdmabuf));
1140 set_dma_count(dma,0x100);
1141 enable_dma(dma);
1142 release_dma_lock(f);
1143
1144 (void) inb_p(io+3);
1145 (void) inb_p(io+2);
1146 timeout = jiffies+100*HZ/100;
1147
1148 while(time_before(jiffies, timeout)) {
1149 if( 0xf9 == inb_p(io+6))
1150 break;
1151 schedule();
1152 }
1153
1154 if(debug & DEBUG_VERBOSE) {
1155 printk("setting up timer and irq\n");
1156 }
1157
1158 /* grab it and don't let go :-) */
1159 if (irq && request_irq( irq, ltpc_interrupt, 0, "ltpc", dev) >= 0)
1160 {
1161 (void) inb_p(io+7); /* enable interrupts from board */
1162 (void) inb_p(io+7); /* and reset irq line */
1163 } else {
1164 if( irq )
1165 printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
1166 dev->irq = 0;
1167 /* polled mode -- 20 times per second */
1168 /* this is really, really slow... should it poll more often? */
1169 init_timer(<pc_timer);
1170 ltpc_timer.function=ltpc_poll;
1171 ltpc_timer.data = (unsigned long) dev;
1172
1173 ltpc_timer.expires = jiffies + HZ/20;
1174 add_timer(<pc_timer);
1175 }
1176 err = register_netdev(dev);
1177 if (err)
1178 goto out4;
1179
1180 return NULL;
1181 out4:
1182 del_timer_sync(<pc_timer);
1183 if (dev->irq)
1184 free_irq(dev->irq, dev);
1185 out3:
1186 free_pages((unsigned long)ltdmabuf, get_order(1000));
1187 out2:
1188 release_region(io, 8);
1189 out1:
1190 free_netdev(dev);
1191 out:
1192 return ERR_PTR(err);
1193 }
1194
1195 #ifndef MODULE
1196 /* handles "ltpc=io,irq,dma" kernel command lines */
ltpc_setup(char * str)1197 static int __init ltpc_setup(char *str)
1198 {
1199 int ints[5];
1200
1201 str = get_options(str, ARRAY_SIZE(ints), ints);
1202
1203 if (ints[0] == 0) {
1204 if (str && !strncmp(str, "auto", 4)) {
1205 /* do nothing :-) */
1206 }
1207 else {
1208 /* usage message */
1209 printk (KERN_ERR
1210 "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
1211 return 0;
1212 }
1213 } else {
1214 io = ints[1];
1215 if (ints[0] > 1) {
1216 irq = ints[2];
1217 }
1218 if (ints[0] > 2) {
1219 dma = ints[3];
1220 }
1221 /* ignore any other parameters */
1222 }
1223 return 1;
1224 }
1225
1226 __setup("ltpc=", ltpc_setup);
1227 #endif /* MODULE */
1228
1229 static struct net_device *dev_ltpc;
1230
1231 #ifdef MODULE
1232
1233 MODULE_LICENSE("GPL");
1234 module_param(debug, int, 0);
1235 module_param(io, int, 0);
1236 module_param(irq, int, 0);
1237 module_param(dma, int, 0);
1238
1239
ltpc_module_init(void)1240 static int __init ltpc_module_init(void)
1241 {
1242 if(io == 0)
1243 printk(KERN_NOTICE
1244 "ltpc: Autoprobing is not recommended for modules\n");
1245
1246 dev_ltpc = ltpc_probe();
1247 if (IS_ERR(dev_ltpc))
1248 return PTR_ERR(dev_ltpc);
1249 return 0;
1250 }
1251 module_init(ltpc_module_init);
1252 #endif
1253
ltpc_cleanup(void)1254 static void __exit ltpc_cleanup(void)
1255 {
1256
1257 if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
1258 unregister_netdev(dev_ltpc);
1259
1260 ltpc_timer.data = 0; /* signal the poll routine that we're done */
1261
1262 del_timer_sync(<pc_timer);
1263
1264 if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
1265
1266 if (dev_ltpc->irq)
1267 free_irq(dev_ltpc->irq, dev_ltpc);
1268
1269 if(debug & DEBUG_VERBOSE) printk("freeing dma\n");
1270
1271 if (dev_ltpc->dma)
1272 free_dma(dev_ltpc->dma);
1273
1274 if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");
1275
1276 if (dev_ltpc->base_addr)
1277 release_region(dev_ltpc->base_addr,8);
1278
1279 free_netdev(dev_ltpc);
1280
1281 if(debug & DEBUG_VERBOSE) printk("free_pages\n");
1282
1283 free_pages( (unsigned long) ltdmabuf, get_order(1000));
1284
1285 if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
1286 }
1287
1288 module_exit(ltpc_cleanup);
1289