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/slab.h>
219 #include <linux/string.h>
220 #include <linux/errno.h>
221 #include <linux/init.h>
222 #include <linux/netdevice.h>
223 #include <linux/etherdevice.h>
224 #include <linux/skbuff.h>
225 #include <linux/if_arp.h>
226 #include <linux/if_ltalk.h>
227 #include <linux/delay.h>
228 #include <linux/timer.h>
229 #include <linux/atalk.h>
230 #include <linux/bitops.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 net_device_stats stats;
265 struct atalk_addr my_addr;
266 };
267
268 /* transmit queue element struct */
269
270 struct xmitQel {
271 struct xmitQel *next;
272 /* command buffer */
273 unsigned char *cbuf;
274 short cbuflen;
275 /* data buffer */
276 unsigned char *dbuf;
277 short dbuflen;
278 unsigned char QWrite; /* read or write data */
279 unsigned char mailbox;
280 };
281
282 /* the transmit queue itself */
283
284 static struct xmitQel *xmQhd, *xmQtl;
285
enQ(struct xmitQel * qel)286 static void enQ(struct xmitQel *qel)
287 {
288 unsigned long flags;
289 qel->next = NULL;
290
291 spin_lock_irqsave(&txqueue_lock, flags);
292 if (xmQtl) {
293 xmQtl->next = qel;
294 } else {
295 xmQhd = qel;
296 }
297 xmQtl = qel;
298 spin_unlock_irqrestore(&txqueue_lock, flags);
299
300 if (debug & DEBUG_LOWER)
301 printk("enqueued a 0x%02x command\n",qel->cbuf[0]);
302 }
303
deQ(void)304 static struct xmitQel *deQ(void)
305 {
306 unsigned long flags;
307 int i;
308 struct xmitQel *qel=NULL;
309
310 spin_lock_irqsave(&txqueue_lock, flags);
311 if (xmQhd) {
312 qel = xmQhd;
313 xmQhd = qel->next;
314 if(!xmQhd) xmQtl = NULL;
315 }
316 spin_unlock_irqrestore(&txqueue_lock, flags);
317
318 if ((debug & DEBUG_LOWER) && qel) {
319 int n;
320 printk(KERN_DEBUG "ltpc: dequeued command ");
321 n = qel->cbuflen;
322 if (n>100) n=100;
323 for(i=0;i<n;i++) printk("%02x ",qel->cbuf[i]);
324 printk("\n");
325 }
326
327 return qel;
328 }
329
330 /* and... the queue elements we'll be using */
331 static struct xmitQel qels[16];
332
333 /* and their corresponding mailboxes */
334 static unsigned char mailbox[16];
335 static unsigned char mboxinuse[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
336
wait_timeout(struct net_device * dev,int c)337 static int wait_timeout(struct net_device *dev, int c)
338 {
339 /* returns true if it stayed c */
340 /* this uses base+6, but it's ok */
341 int i;
342
343 /* twenty second or so total */
344
345 for(i=0;i<200000;i++) {
346 if ( c != inb_p(dev->base_addr+6) ) return 0;
347 udelay(100);
348 }
349 return 1; /* timed out */
350 }
351
352 /* get the first free mailbox */
353
getmbox(void)354 static int getmbox(void)
355 {
356 unsigned long flags;
357 int i;
358
359 spin_lock_irqsave(&mbox_lock, flags);
360 for(i=1;i<16;i++) if(!mboxinuse[i]) {
361 mboxinuse[i]=1;
362 spin_unlock_irqrestore(&mbox_lock, flags);
363 return i;
364 }
365 spin_unlock_irqrestore(&mbox_lock, flags);
366 return 0;
367 }
368
369 /* read a command from the card */
handlefc(struct net_device * dev)370 static void handlefc(struct net_device *dev)
371 {
372 /* called *only* from idle, non-reentrant */
373 int dma = dev->dma;
374 int base = dev->base_addr;
375 unsigned long flags;
376
377
378 flags=claim_dma_lock();
379 disable_dma(dma);
380 clear_dma_ff(dma);
381 set_dma_mode(dma,DMA_MODE_READ);
382 set_dma_addr(dma,virt_to_bus(ltdmacbuf));
383 set_dma_count(dma,50);
384 enable_dma(dma);
385 release_dma_lock(flags);
386
387 inb_p(base+3);
388 inb_p(base+2);
389
390 if ( wait_timeout(dev,0xfc) ) printk("timed out in handlefc\n");
391 }
392
393 /* read data from the card */
handlefd(struct net_device * dev)394 static void handlefd(struct net_device *dev)
395 {
396 int dma = dev->dma;
397 int base = dev->base_addr;
398 unsigned long flags;
399
400 flags=claim_dma_lock();
401 disable_dma(dma);
402 clear_dma_ff(dma);
403 set_dma_mode(dma,DMA_MODE_READ);
404 set_dma_addr(dma,virt_to_bus(ltdmabuf));
405 set_dma_count(dma,800);
406 enable_dma(dma);
407 release_dma_lock(flags);
408
409 inb_p(base+3);
410 inb_p(base+2);
411
412 if ( wait_timeout(dev,0xfd) ) printk("timed out in handlefd\n");
413 sendup_buffer(dev);
414 }
415
handlewrite(struct net_device * dev)416 static void handlewrite(struct net_device *dev)
417 {
418 /* called *only* from idle, non-reentrant */
419 /* on entry, 0xfb and ltdmabuf holds data */
420 int dma = dev->dma;
421 int base = dev->base_addr;
422 unsigned long flags;
423
424 flags=claim_dma_lock();
425 disable_dma(dma);
426 clear_dma_ff(dma);
427 set_dma_mode(dma,DMA_MODE_WRITE);
428 set_dma_addr(dma,virt_to_bus(ltdmabuf));
429 set_dma_count(dma,800);
430 enable_dma(dma);
431 release_dma_lock(flags);
432
433 inb_p(base+3);
434 inb_p(base+2);
435
436 if ( wait_timeout(dev,0xfb) ) {
437 flags=claim_dma_lock();
438 printk("timed out in handlewrite, dma res %d\n",
439 get_dma_residue(dev->dma) );
440 release_dma_lock(flags);
441 }
442 }
443
handleread(struct net_device * dev)444 static void handleread(struct net_device *dev)
445 {
446 /* on entry, 0xfb */
447 /* on exit, ltdmabuf holds data */
448 int dma = dev->dma;
449 int base = dev->base_addr;
450 unsigned long flags;
451
452
453 flags=claim_dma_lock();
454 disable_dma(dma);
455 clear_dma_ff(dma);
456 set_dma_mode(dma,DMA_MODE_READ);
457 set_dma_addr(dma,virt_to_bus(ltdmabuf));
458 set_dma_count(dma,800);
459 enable_dma(dma);
460 release_dma_lock(flags);
461
462 inb_p(base+3);
463 inb_p(base+2);
464 if ( wait_timeout(dev,0xfb) ) printk("timed out in handleread\n");
465 }
466
handlecommand(struct net_device * dev)467 static void handlecommand(struct net_device *dev)
468 {
469 /* on entry, 0xfa and ltdmacbuf holds command */
470 int dma = dev->dma;
471 int base = dev->base_addr;
472 unsigned long flags;
473
474 flags=claim_dma_lock();
475 disable_dma(dma);
476 clear_dma_ff(dma);
477 set_dma_mode(dma,DMA_MODE_WRITE);
478 set_dma_addr(dma,virt_to_bus(ltdmacbuf));
479 set_dma_count(dma,50);
480 enable_dma(dma);
481 release_dma_lock(flags);
482 inb_p(base+3);
483 inb_p(base+2);
484 if ( wait_timeout(dev,0xfa) ) printk("timed out in handlecommand\n");
485 }
486
487 /* ready made command for getting the result from the card */
488 static unsigned char rescbuf[2] = {LT_GETRESULT,0};
489 static unsigned char resdbuf[2];
490
491 static int QInIdle;
492
493 /* idle expects to be called with the IRQ line high -- either because of
494 * an interrupt, or because the line is tri-stated
495 */
496
idle(struct net_device * dev)497 static void idle(struct net_device *dev)
498 {
499 unsigned long flags;
500 int state;
501 /* FIXME This is initialized to shut the warning up, but I need to
502 * think this through again.
503 */
504 struct xmitQel *q = NULL;
505 int oops;
506 int i;
507 int base = dev->base_addr;
508
509 spin_lock_irqsave(&txqueue_lock, flags);
510 if(QInIdle) {
511 spin_unlock_irqrestore(&txqueue_lock, flags);
512 return;
513 }
514 QInIdle = 1;
515 spin_unlock_irqrestore(&txqueue_lock, flags);
516
517 /* this tri-states the IRQ line */
518 (void) inb_p(base+6);
519
520 oops = 100;
521
522 loop:
523 if (0>oops--) {
524 printk("idle: looped too many times\n");
525 goto done;
526 }
527
528 state = inb_p(base+6);
529 if (state != inb_p(base+6)) goto loop;
530
531 switch(state) {
532 case 0xfc:
533 /* incoming command */
534 if (debug & DEBUG_LOWER) printk("idle: fc\n");
535 handlefc(dev);
536 break;
537 case 0xfd:
538 /* incoming data */
539 if(debug & DEBUG_LOWER) printk("idle: fd\n");
540 handlefd(dev);
541 break;
542 case 0xf9:
543 /* result ready */
544 if (debug & DEBUG_LOWER) printk("idle: f9\n");
545 if(!mboxinuse[0]) {
546 mboxinuse[0] = 1;
547 qels[0].cbuf = rescbuf;
548 qels[0].cbuflen = 2;
549 qels[0].dbuf = resdbuf;
550 qels[0].dbuflen = 2;
551 qels[0].QWrite = 0;
552 qels[0].mailbox = 0;
553 enQ(&qels[0]);
554 }
555 inb_p(dev->base_addr+1);
556 inb_p(dev->base_addr+0);
557 if( wait_timeout(dev,0xf9) )
558 printk("timed out idle f9\n");
559 break;
560 case 0xf8:
561 /* ?? */
562 if (xmQhd) {
563 inb_p(dev->base_addr+1);
564 inb_p(dev->base_addr+0);
565 if(wait_timeout(dev,0xf8) )
566 printk("timed out idle f8\n");
567 } else {
568 goto done;
569 }
570 break;
571 case 0xfa:
572 /* waiting for command */
573 if(debug & DEBUG_LOWER) printk("idle: fa\n");
574 if (xmQhd) {
575 q=deQ();
576 memcpy(ltdmacbuf,q->cbuf,q->cbuflen);
577 ltdmacbuf[1] = q->mailbox;
578 if (debug>1) {
579 int n;
580 printk("ltpc: sent command ");
581 n = q->cbuflen;
582 if (n>100) n=100;
583 for(i=0;i<n;i++)
584 printk("%02x ",ltdmacbuf[i]);
585 printk("\n");
586 }
587 handlecommand(dev);
588 if(0xfa==inb_p(base+6)) {
589 /* we timed out, so return */
590 goto done;
591 }
592 } else {
593 /* we don't seem to have a command */
594 if (!mboxinuse[0]) {
595 mboxinuse[0] = 1;
596 qels[0].cbuf = rescbuf;
597 qels[0].cbuflen = 2;
598 qels[0].dbuf = resdbuf;
599 qels[0].dbuflen = 2;
600 qels[0].QWrite = 0;
601 qels[0].mailbox = 0;
602 enQ(&qels[0]);
603 } else {
604 printk("trouble: response command already queued\n");
605 goto done;
606 }
607 }
608 break;
609 case 0Xfb:
610 /* data transfer ready */
611 if(debug & DEBUG_LOWER) printk("idle: fb\n");
612 if(q->QWrite) {
613 memcpy(ltdmabuf,q->dbuf,q->dbuflen);
614 handlewrite(dev);
615 } else {
616 handleread(dev);
617 /* non-zero mailbox numbers are for
618 commmands, 0 is for GETRESULT
619 requests */
620 if(q->mailbox) {
621 memcpy(q->dbuf,ltdmabuf,q->dbuflen);
622 } else {
623 /* this was a result */
624 mailbox[ 0x0f & ltdmabuf[0] ] = ltdmabuf[1];
625 mboxinuse[0]=0;
626 }
627 }
628 break;
629 }
630 goto loop;
631
632 done:
633 QInIdle=0;
634
635 /* now set the interrupts back as appropriate */
636 /* the first read takes it out of tri-state (but still high) */
637 /* the second resets it */
638 /* note that after this point, any read of base+6 will
639 trigger an interrupt */
640
641 if (dev->irq) {
642 inb_p(base+7);
643 inb_p(base+7);
644 }
645 return;
646 }
647
648
do_write(struct net_device * dev,void * cbuf,int cbuflen,void * dbuf,int dbuflen)649 static int do_write(struct net_device *dev, void *cbuf, int cbuflen,
650 void *dbuf, int dbuflen)
651 {
652
653 int i = getmbox();
654 int ret;
655
656 if(i) {
657 qels[i].cbuf = (unsigned char *) cbuf;
658 qels[i].cbuflen = cbuflen;
659 qels[i].dbuf = (unsigned char *) dbuf;
660 qels[i].dbuflen = dbuflen;
661 qels[i].QWrite = 1;
662 qels[i].mailbox = i; /* this should be initted rather */
663 enQ(&qels[i]);
664 idle(dev);
665 ret = mailbox[i];
666 mboxinuse[i]=0;
667 return ret;
668 }
669 printk("ltpc: could not allocate mbox\n");
670 return -1;
671 }
672
do_read(struct net_device * dev,void * cbuf,int cbuflen,void * dbuf,int dbuflen)673 static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
674 void *dbuf, int dbuflen)
675 {
676
677 int i = getmbox();
678 int ret;
679
680 if(i) {
681 qels[i].cbuf = (unsigned char *) cbuf;
682 qels[i].cbuflen = cbuflen;
683 qels[i].dbuf = (unsigned char *) dbuf;
684 qels[i].dbuflen = dbuflen;
685 qels[i].QWrite = 0;
686 qels[i].mailbox = i; /* this should be initted rather */
687 enQ(&qels[i]);
688 idle(dev);
689 ret = mailbox[i];
690 mboxinuse[i]=0;
691 return ret;
692 }
693 printk("ltpc: could not allocate mbox\n");
694 return -1;
695 }
696
697 /* end of idle handlers -- what should be seen is do_read, do_write */
698
699 static struct timer_list ltpc_timer;
700
701 static int ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
702 static struct net_device_stats *ltpc_get_stats(struct net_device *dev);
703
read_30(struct net_device * dev)704 static int read_30 ( struct net_device *dev)
705 {
706 lt_command c;
707 c.getflags.command = LT_GETFLAGS;
708 return do_read(dev, &c, sizeof(c.getflags),&c,0);
709 }
710
set_30(struct net_device * dev,int x)711 static int set_30 (struct net_device *dev,int x)
712 {
713 lt_command c;
714 c.setflags.command = LT_SETFLAGS;
715 c.setflags.flags = x;
716 return do_write(dev, &c, sizeof(c.setflags),&c,0);
717 }
718
719 /* LLAP to DDP translation */
720
sendup_buffer(struct net_device * dev)721 static int sendup_buffer (struct net_device *dev)
722 {
723 /* on entry, command is in ltdmacbuf, data in ltdmabuf */
724 /* called from idle, non-reentrant */
725
726 int dnode, snode, llaptype, len;
727 int sklen;
728 struct sk_buff *skb;
729 struct ltpc_private *ltpc_priv = netdev_priv(dev);
730 struct net_device_stats *stats = <pc_priv->stats;
731 struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;
732
733 if (ltc->command != LT_RCVLAP) {
734 printk("unknown command 0x%02x from ltpc card\n",ltc->command);
735 return(-1);
736 }
737 dnode = ltc->dnode;
738 snode = ltc->snode;
739 llaptype = ltc->laptype;
740 len = ltc->length;
741
742 sklen = len;
743 if (llaptype == 1)
744 sklen += 8; /* correct for short ddp */
745 if(sklen > 800) {
746 printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
747 dev->name,sklen);
748 return -1;
749 }
750
751 if ( (llaptype==0) || (llaptype>2) ) {
752 printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
753 return -1;
754 }
755
756
757 skb = dev_alloc_skb(3+sklen);
758 if (skb == NULL)
759 {
760 printk("%s: dropping packet due to memory squeeze.\n",
761 dev->name);
762 return -1;
763 }
764 skb->dev = dev;
765
766 if (sklen > len)
767 skb_reserve(skb,8);
768 skb_put(skb,len+3);
769 skb->protocol = htons(ETH_P_LOCALTALK);
770 /* add LLAP header */
771 skb->data[0] = dnode;
772 skb->data[1] = snode;
773 skb->data[2] = llaptype;
774 skb_reset_mac_header(skb); /* save pointer to llap header */
775 skb_pull(skb,3);
776
777 /* copy ddp(s,e)hdr + contents */
778 skb_copy_to_linear_data(skb, ltdmabuf, len);
779
780 skb_reset_transport_header(skb);
781
782 stats->rx_packets++;
783 stats->rx_bytes+=skb->len;
784
785 /* toss it onwards */
786 netif_rx(skb);
787 return 0;
788 }
789
790 /* the handler for the board interrupt */
791
792 static irqreturn_t
ltpc_interrupt(int irq,void * dev_id)793 ltpc_interrupt(int irq, void *dev_id)
794 {
795 struct net_device *dev = dev_id;
796
797 if (dev==NULL) {
798 printk("ltpc_interrupt: unknown device.\n");
799 return IRQ_NONE;
800 }
801
802 inb_p(dev->base_addr+6); /* disable further interrupts from board */
803
804 idle(dev); /* handle whatever is coming in */
805
806 /* idle re-enables interrupts from board */
807
808 return IRQ_HANDLED;
809 }
810
811 /***
812 *
813 * The ioctls that the driver responds to are:
814 *
815 * SIOCSIFADDR -- do probe using the passed node hint.
816 * SIOCGIFADDR -- return net, node.
817 *
818 * some of this stuff should be done elsewhere.
819 *
820 ***/
821
ltpc_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)822 static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
823 {
824 struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
825 /* we'll keep the localtalk node address in dev->pa_addr */
826 struct ltpc_private *ltpc_priv = netdev_priv(dev);
827 struct atalk_addr *aa = <pc_priv->my_addr;
828 struct lt_init c;
829 int ltflags;
830
831 if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
832
833 switch(cmd) {
834 case SIOCSIFADDR:
835
836 aa->s_net = sa->sat_addr.s_net;
837
838 /* this does the probe and returns the node addr */
839 c.command = LT_INIT;
840 c.hint = sa->sat_addr.s_node;
841
842 aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
843
844 /* get all llap frames raw */
845 ltflags = read_30(dev);
846 ltflags |= LT_FLAG_ALLLAP;
847 set_30 (dev,ltflags);
848
849 dev->broadcast[0] = 0xFF;
850 dev->dev_addr[0] = aa->s_node;
851
852 dev->addr_len=1;
853
854 return 0;
855
856 case SIOCGIFADDR:
857
858 sa->sat_addr.s_net = aa->s_net;
859 sa->sat_addr.s_node = aa->s_node;
860
861 return 0;
862
863 default:
864 return -EINVAL;
865 }
866 }
867
set_multicast_list(struct net_device * dev)868 static void set_multicast_list(struct net_device *dev)
869 {
870 /* This needs to be present to keep netatalk happy. */
871 /* Actually netatalk needs fixing! */
872 }
873
874 static int ltpc_poll_counter;
875
ltpc_poll(unsigned long l)876 static void ltpc_poll(unsigned long l)
877 {
878 struct net_device *dev = (struct net_device *) l;
879
880 del_timer(<pc_timer);
881
882 if(debug & DEBUG_VERBOSE) {
883 if (!ltpc_poll_counter) {
884 ltpc_poll_counter = 50;
885 printk("ltpc poll is alive\n");
886 }
887 ltpc_poll_counter--;
888 }
889
890 if (!dev)
891 return; /* we've been downed */
892
893 /* poll 20 times per second */
894 idle(dev);
895 ltpc_timer.expires = jiffies + HZ/20;
896
897 add_timer(<pc_timer);
898 }
899
900 /* DDP to LLAP translation */
901
ltpc_xmit(struct sk_buff * skb,struct net_device * dev)902 static int ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
903 {
904 /* in kernel 1.3.xx, on entry skb->data points to ddp header,
905 * and skb->len is the length of the ddp data + ddp header
906 */
907
908 struct ltpc_private *ltpc_priv = netdev_priv(dev);
909 struct net_device_stats *stats = <pc_priv->stats;
910
911 int i;
912 struct lt_sendlap cbuf;
913 unsigned char *hdr;
914
915 cbuf.command = LT_SENDLAP;
916 cbuf.dnode = skb->data[0];
917 cbuf.laptype = skb->data[2];
918 skb_pull(skb,3); /* skip past LLAP header */
919 cbuf.length = skb->len; /* this is host order */
920 skb_reset_transport_header(skb);
921
922 if(debug & DEBUG_UPPER) {
923 printk("command ");
924 for(i=0;i<6;i++)
925 printk("%02x ",((unsigned char *)&cbuf)[i]);
926 printk("\n");
927 }
928
929 hdr = skb_transport_header(skb);
930 do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);
931
932 if(debug & DEBUG_UPPER) {
933 printk("sent %d ddp bytes\n",skb->len);
934 for (i = 0; i < skb->len; i++)
935 printk("%02x ", hdr[i]);
936 printk("\n");
937 }
938
939 stats->tx_packets++;
940 stats->tx_bytes+=skb->len;
941
942 dev_kfree_skb(skb);
943 return 0;
944 }
945
ltpc_get_stats(struct net_device * dev)946 static struct net_device_stats *ltpc_get_stats(struct net_device *dev)
947 {
948 struct ltpc_private *ltpc_priv = netdev_priv(dev);
949 struct net_device_stats *stats = <pc_priv->stats;
950 return stats;
951 }
952
953 /* initialization stuff */
954
ltpc_probe_dma(int base,int dma)955 static int __init ltpc_probe_dma(int base, int dma)
956 {
957 int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
958 unsigned long timeout;
959 unsigned long f;
960
961 if (want & 1) {
962 if (request_dma(1,"ltpc")) {
963 want &= ~1;
964 } else {
965 f=claim_dma_lock();
966 disable_dma(1);
967 clear_dma_ff(1);
968 set_dma_mode(1,DMA_MODE_WRITE);
969 set_dma_addr(1,virt_to_bus(ltdmabuf));
970 set_dma_count(1,sizeof(struct lt_mem));
971 enable_dma(1);
972 release_dma_lock(f);
973 }
974 }
975 if (want & 2) {
976 if (request_dma(3,"ltpc")) {
977 want &= ~2;
978 } else {
979 f=claim_dma_lock();
980 disable_dma(3);
981 clear_dma_ff(3);
982 set_dma_mode(3,DMA_MODE_WRITE);
983 set_dma_addr(3,virt_to_bus(ltdmabuf));
984 set_dma_count(3,sizeof(struct lt_mem));
985 enable_dma(3);
986 release_dma_lock(f);
987 }
988 }
989 /* set up request */
990
991 /* FIXME -- do timings better! */
992
993 ltdmabuf[0] = LT_READMEM;
994 ltdmabuf[1] = 1; /* mailbox */
995 ltdmabuf[2] = 0; ltdmabuf[3] = 0; /* address */
996 ltdmabuf[4] = 0; ltdmabuf[5] = 1; /* read 0x0100 bytes */
997 ltdmabuf[6] = 0; /* dunno if this is necessary */
998
999 inb_p(io+1);
1000 inb_p(io+0);
1001 timeout = jiffies+100*HZ/100;
1002 while(time_before(jiffies, timeout)) {
1003 if ( 0xfa == inb_p(io+6) ) break;
1004 }
1005
1006 inb_p(io+3);
1007 inb_p(io+2);
1008 while(time_before(jiffies, timeout)) {
1009 if ( 0xfb == inb_p(io+6) ) break;
1010 }
1011
1012 /* release the other dma channel (if we opened both of them) */
1013
1014 if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
1015 want &= ~2;
1016 free_dma(3);
1017 }
1018
1019 if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
1020 want &= ~1;
1021 free_dma(1);
1022 }
1023
1024 if (!want)
1025 return 0;
1026
1027 return (want & 2) ? 3 : 1;
1028 }
1029
ltpc_probe(void)1030 struct net_device * __init ltpc_probe(void)
1031 {
1032 struct net_device *dev;
1033 int err = -ENOMEM;
1034 int x=0,y=0;
1035 int autoirq;
1036 unsigned long f;
1037 unsigned long timeout;
1038
1039 dev = alloc_ltalkdev(sizeof(struct ltpc_private));
1040 if (!dev)
1041 goto out;
1042
1043 /* probe for the I/O port address */
1044
1045 if (io != 0x240 && request_region(0x220,8,"ltpc")) {
1046 x = inb_p(0x220+6);
1047 if ( (x!=0xff) && (x>=0xf0) ) {
1048 io = 0x220;
1049 goto got_port;
1050 }
1051 release_region(0x220,8);
1052 }
1053 if (io != 0x220 && request_region(0x240,8,"ltpc")) {
1054 y = inb_p(0x240+6);
1055 if ( (y!=0xff) && (y>=0xf0) ){
1056 io = 0x240;
1057 goto got_port;
1058 }
1059 release_region(0x240,8);
1060 }
1061
1062 /* give up in despair */
1063 printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
1064 err = -ENODEV;
1065 goto out1;
1066
1067 got_port:
1068 /* probe for the IRQ line */
1069 if (irq < 2) {
1070 unsigned long irq_mask;
1071
1072 irq_mask = probe_irq_on();
1073 /* reset the interrupt line */
1074 inb_p(io+7);
1075 inb_p(io+7);
1076 /* trigger an interrupt (I hope) */
1077 inb_p(io+6);
1078 mdelay(2);
1079 autoirq = probe_irq_off(irq_mask);
1080
1081 if (autoirq == 0) {
1082 printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
1083 } else {
1084 irq = autoirq;
1085 }
1086 }
1087
1088 /* allocate a DMA buffer */
1089 ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
1090 if (!ltdmabuf) {
1091 printk(KERN_ERR "ltpc: mem alloc failed\n");
1092 err = -ENOMEM;
1093 goto out2;
1094 }
1095
1096 ltdmacbuf = <dmabuf[800];
1097
1098 if(debug & DEBUG_VERBOSE) {
1099 printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
1100 }
1101
1102 /* reset the card */
1103
1104 inb_p(io+1);
1105 inb_p(io+3);
1106
1107 msleep(20);
1108
1109 inb_p(io+0);
1110 inb_p(io+2);
1111 inb_p(io+7); /* clear reset */
1112 inb_p(io+4);
1113 inb_p(io+5);
1114 inb_p(io+5); /* enable dma */
1115 inb_p(io+6); /* tri-state interrupt line */
1116
1117 ssleep(1);
1118
1119 /* now, figure out which dma channel we're using, unless it's
1120 already been specified */
1121 /* well, 0 is a legal DMA channel, but the LTPC card doesn't
1122 use it... */
1123 dma = ltpc_probe_dma(io, dma);
1124 if (!dma) { /* no dma channel */
1125 printk(KERN_ERR "No DMA channel found on ltpc card.\n");
1126 err = -ENODEV;
1127 goto out3;
1128 }
1129
1130 /* print out friendly message */
1131 if(irq)
1132 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
1133 else
1134 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d. Using polled mode.\n",io,dma);
1135
1136 /* Fill in the fields of the device structure with ethernet-generic values. */
1137 dev->hard_start_xmit = ltpc_xmit;
1138 dev->get_stats = ltpc_get_stats;
1139
1140 /* add the ltpc-specific things */
1141 dev->do_ioctl = <pc_ioctl;
1142
1143 dev->set_multicast_list = &set_multicast_list;
1144 dev->mc_list = NULL;
1145 dev->base_addr = io;
1146 dev->irq = irq;
1147 dev->dma = dma;
1148
1149 /* the card will want to send a result at this point */
1150 /* (I think... leaving out this part makes the kernel crash,
1151 so I put it back in...) */
1152
1153 f=claim_dma_lock();
1154 disable_dma(dma);
1155 clear_dma_ff(dma);
1156 set_dma_mode(dma,DMA_MODE_READ);
1157 set_dma_addr(dma,virt_to_bus(ltdmabuf));
1158 set_dma_count(dma,0x100);
1159 enable_dma(dma);
1160 release_dma_lock(f);
1161
1162 (void) inb_p(io+3);
1163 (void) inb_p(io+2);
1164 timeout = jiffies+100*HZ/100;
1165
1166 while(time_before(jiffies, timeout)) {
1167 if( 0xf9 == inb_p(io+6))
1168 break;
1169 schedule();
1170 }
1171
1172 if(debug & DEBUG_VERBOSE) {
1173 printk("setting up timer and irq\n");
1174 }
1175
1176 /* grab it and don't let go :-) */
1177 if (irq && request_irq( irq, <pc_interrupt, 0, "ltpc", dev) >= 0)
1178 {
1179 (void) inb_p(io+7); /* enable interrupts from board */
1180 (void) inb_p(io+7); /* and reset irq line */
1181 } else {
1182 if( irq )
1183 printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
1184 dev->irq = 0;
1185 /* polled mode -- 20 times per second */
1186 /* this is really, really slow... should it poll more often? */
1187 init_timer(<pc_timer);
1188 ltpc_timer.function=ltpc_poll;
1189 ltpc_timer.data = (unsigned long) dev;
1190
1191 ltpc_timer.expires = jiffies + HZ/20;
1192 add_timer(<pc_timer);
1193 }
1194 err = register_netdev(dev);
1195 if (err)
1196 goto out4;
1197
1198 return NULL;
1199 out4:
1200 del_timer_sync(<pc_timer);
1201 if (dev->irq)
1202 free_irq(dev->irq, dev);
1203 out3:
1204 free_pages((unsigned long)ltdmabuf, get_order(1000));
1205 out2:
1206 release_region(io, 8);
1207 out1:
1208 free_netdev(dev);
1209 out:
1210 return ERR_PTR(err);
1211 }
1212
1213 #ifndef MODULE
1214 /* handles "ltpc=io,irq,dma" kernel command lines */
ltpc_setup(char * str)1215 static int __init ltpc_setup(char *str)
1216 {
1217 int ints[5];
1218
1219 str = get_options(str, ARRAY_SIZE(ints), ints);
1220
1221 if (ints[0] == 0) {
1222 if (str && !strncmp(str, "auto", 4)) {
1223 /* do nothing :-) */
1224 }
1225 else {
1226 /* usage message */
1227 printk (KERN_ERR
1228 "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
1229 return 0;
1230 }
1231 } else {
1232 io = ints[1];
1233 if (ints[0] > 1) {
1234 irq = ints[2];
1235 }
1236 if (ints[0] > 2) {
1237 dma = ints[3];
1238 }
1239 /* ignore any other paramters */
1240 }
1241 return 1;
1242 }
1243
1244 __setup("ltpc=", ltpc_setup);
1245 #endif /* MODULE */
1246
1247 static struct net_device *dev_ltpc;
1248
1249 #ifdef MODULE
1250
1251 MODULE_LICENSE("GPL");
1252 module_param(debug, int, 0);
1253 module_param(io, int, 0);
1254 module_param(irq, int, 0);
1255 module_param(dma, int, 0);
1256
1257
ltpc_module_init(void)1258 static int __init ltpc_module_init(void)
1259 {
1260 if(io == 0)
1261 printk(KERN_NOTICE
1262 "ltpc: Autoprobing is not recommended for modules\n");
1263
1264 dev_ltpc = ltpc_probe();
1265 if (IS_ERR(dev_ltpc))
1266 return PTR_ERR(dev_ltpc);
1267 return 0;
1268 }
1269 module_init(ltpc_module_init);
1270 #endif
1271
ltpc_cleanup(void)1272 static void __exit ltpc_cleanup(void)
1273 {
1274
1275 if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
1276 unregister_netdev(dev_ltpc);
1277
1278 ltpc_timer.data = 0; /* signal the poll routine that we're done */
1279
1280 del_timer_sync(<pc_timer);
1281
1282 if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
1283
1284 if (dev_ltpc->irq)
1285 free_irq(dev_ltpc->irq, dev_ltpc);
1286
1287 if(debug & DEBUG_VERBOSE) printk("freeing dma\n");
1288
1289 if (dev_ltpc->dma)
1290 free_dma(dev_ltpc->dma);
1291
1292 if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");
1293
1294 if (dev_ltpc->base_addr)
1295 release_region(dev_ltpc->base_addr,8);
1296
1297 free_netdev(dev_ltpc);
1298
1299 if(debug & DEBUG_VERBOSE) printk("free_pages\n");
1300
1301 free_pages( (unsigned long) ltdmabuf, get_order(1000));
1302
1303 if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
1304 }
1305
1306 module_exit(ltpc_cleanup);
1307