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 <net/Space.h>
233
234 #include <asm/dma.h>
235 #include <asm/io.h>
236
237 /* our stuff */
238 #include "ltpc.h"
239
240 static DEFINE_SPINLOCK(txqueue_lock);
241 static DEFINE_SPINLOCK(mbox_lock);
242
243 /* function prototypes */
244 static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
245 void *dbuf, int dbuflen);
246 static int sendup_buffer (struct net_device *dev);
247
248 /* Dma Memory related stuff, cribbed directly from 3c505.c */
249
dma_mem_alloc(int size)250 static unsigned long dma_mem_alloc(int size)
251 {
252 int order = get_order(size);
253
254 return __get_dma_pages(GFP_KERNEL, order);
255 }
256
257 /* DMA data buffer, DMA command buffer */
258 static unsigned char *ltdmabuf;
259 static unsigned char *ltdmacbuf;
260
261 /* private struct, holds our appletalk address */
262
263 struct ltpc_private
264 {
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
588 handlecommand(dev);
589
590 if (0xfa == inb_p(base + 6)) {
591 /* we timed out, so return */
592 goto done;
593 }
594 } else {
595 /* we don't seem to have a command */
596 if (!mboxinuse[0]) {
597 mboxinuse[0] = 1;
598 qels[0].cbuf = rescbuf;
599 qels[0].cbuflen = 2;
600 qels[0].dbuf = resdbuf;
601 qels[0].dbuflen = 2;
602 qels[0].QWrite = 0;
603 qels[0].mailbox = 0;
604 enQ(&qels[0]);
605 } else {
606 printk("trouble: response command already queued\n");
607 goto done;
608 }
609 }
610 break;
611 case 0Xfb:
612 /* data transfer ready */
613 if(debug & DEBUG_LOWER) printk("idle: fb\n");
614 if(q->QWrite) {
615 memcpy(ltdmabuf,q->dbuf,q->dbuflen);
616 handlewrite(dev);
617 } else {
618 handleread(dev);
619 /* non-zero mailbox numbers are for
620 commmands, 0 is for GETRESULT
621 requests */
622 if(q->mailbox) {
623 memcpy(q->dbuf,ltdmabuf,q->dbuflen);
624 } else {
625 /* this was a result */
626 mailbox[ 0x0f & ltdmabuf[0] ] = ltdmabuf[1];
627 mboxinuse[0]=0;
628 }
629 }
630 break;
631 }
632 goto loop;
633
634 done:
635 QInIdle=0;
636
637 /* now set the interrupts back as appropriate */
638 /* the first read takes it out of tri-state (but still high) */
639 /* the second resets it */
640 /* note that after this point, any read of base+6 will
641 trigger an interrupt */
642
643 if (dev->irq) {
644 inb_p(base+7);
645 inb_p(base+7);
646 }
647 }
648
649
do_write(struct net_device * dev,void * cbuf,int cbuflen,void * dbuf,int dbuflen)650 static int do_write(struct net_device *dev, void *cbuf, int cbuflen,
651 void *dbuf, int dbuflen)
652 {
653
654 int i = getmbox();
655 int ret;
656
657 if(i) {
658 qels[i].cbuf = cbuf;
659 qels[i].cbuflen = cbuflen;
660 qels[i].dbuf = dbuf;
661 qels[i].dbuflen = dbuflen;
662 qels[i].QWrite = 1;
663 qels[i].mailbox = i; /* this should be initted rather */
664 enQ(&qels[i]);
665 idle(dev);
666 ret = mailbox[i];
667 mboxinuse[i]=0;
668 return ret;
669 }
670 printk("ltpc: could not allocate mbox\n");
671 return -1;
672 }
673
do_read(struct net_device * dev,void * cbuf,int cbuflen,void * dbuf,int dbuflen)674 static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
675 void *dbuf, int dbuflen)
676 {
677
678 int i = getmbox();
679 int ret;
680
681 if(i) {
682 qels[i].cbuf = cbuf;
683 qels[i].cbuflen = cbuflen;
684 qels[i].dbuf = dbuf;
685 qels[i].dbuflen = dbuflen;
686 qels[i].QWrite = 0;
687 qels[i].mailbox = i; /* this should be initted rather */
688 enQ(&qels[i]);
689 idle(dev);
690 ret = mailbox[i];
691 mboxinuse[i]=0;
692 return ret;
693 }
694 printk("ltpc: could not allocate mbox\n");
695 return -1;
696 }
697
698 /* end of idle handlers -- what should be seen is do_read, do_write */
699
700 static struct timer_list ltpc_timer;
701 static struct net_device *ltpc_timer_dev;
702
703 static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
704
read_30(struct net_device * dev)705 static int read_30 ( struct net_device *dev)
706 {
707 lt_command c;
708 c.getflags.command = LT_GETFLAGS;
709 return do_read(dev, &c, sizeof(c.getflags),&c,0);
710 }
711
set_30(struct net_device * dev,int x)712 static int set_30 (struct net_device *dev,int x)
713 {
714 lt_command c;
715 c.setflags.command = LT_SETFLAGS;
716 c.setflags.flags = x;
717 return do_write(dev, &c, sizeof(c.setflags),&c,0);
718 }
719
720 /* LLAP to DDP translation */
721
sendup_buffer(struct net_device * dev)722 static int sendup_buffer (struct net_device *dev)
723 {
724 /* on entry, command is in ltdmacbuf, data in ltdmabuf */
725 /* called from idle, non-reentrant */
726
727 int dnode, snode, llaptype, len;
728 int sklen;
729 struct sk_buff *skb;
730 struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;
731
732 if (ltc->command != LT_RCVLAP) {
733 printk("unknown command 0x%02x from ltpc card\n",ltc->command);
734 return -1;
735 }
736 dnode = ltc->dnode;
737 snode = ltc->snode;
738 llaptype = ltc->laptype;
739 len = ltc->length;
740
741 sklen = len;
742 if (llaptype == 1)
743 sklen += 8; /* correct for short ddp */
744 if(sklen > 800) {
745 printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
746 dev->name,sklen);
747 return -1;
748 }
749
750 if ( (llaptype==0) || (llaptype>2) ) {
751 printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
752 return -1;
753 }
754
755
756 skb = dev_alloc_skb(3+sklen);
757 if (skb == NULL)
758 {
759 printk("%s: dropping packet due to memory squeeze.\n",
760 dev->name);
761 return -1;
762 }
763 skb->dev = dev;
764
765 if (sklen > len)
766 skb_reserve(skb,8);
767 skb_put(skb,len+3);
768 skb->protocol = htons(ETH_P_LOCALTALK);
769 /* add LLAP header */
770 skb->data[0] = dnode;
771 skb->data[1] = snode;
772 skb->data[2] = llaptype;
773 skb_reset_mac_header(skb); /* save pointer to llap header */
774 skb_pull(skb,3);
775
776 /* copy ddp(s,e)hdr + contents */
777 skb_copy_to_linear_data(skb, ltdmabuf, len);
778
779 skb_reset_transport_header(skb);
780
781 dev->stats.rx_packets++;
782 dev->stats.rx_bytes += skb->len;
783
784 /* toss it onwards */
785 netif_rx(skb);
786 return 0;
787 }
788
789 /* the handler for the board interrupt */
790
791 static irqreturn_t
ltpc_interrupt(int irq,void * dev_id)792 ltpc_interrupt(int irq, void *dev_id)
793 {
794 struct net_device *dev = dev_id;
795
796 if (dev==NULL) {
797 printk("ltpc_interrupt: unknown device.\n");
798 return IRQ_NONE;
799 }
800
801 inb_p(dev->base_addr+6); /* disable further interrupts from board */
802
803 idle(dev); /* handle whatever is coming in */
804
805 /* idle re-enables interrupts from board */
806
807 return IRQ_HANDLED;
808 }
809
810 /***
811 *
812 * The ioctls that the driver responds to are:
813 *
814 * SIOCSIFADDR -- do probe using the passed node hint.
815 * SIOCGIFADDR -- return net, node.
816 *
817 * some of this stuff should be done elsewhere.
818 *
819 ***/
820
ltpc_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)821 static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
822 {
823 struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
824 /* we'll keep the localtalk node address in dev->pa_addr */
825 struct ltpc_private *ltpc_priv = netdev_priv(dev);
826 struct atalk_addr *aa = <pc_priv->my_addr;
827 struct lt_init c;
828 int ltflags;
829
830 if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
831
832 switch(cmd) {
833 case SIOCSIFADDR:
834
835 aa->s_net = sa->sat_addr.s_net;
836
837 /* this does the probe and returns the node addr */
838 c.command = LT_INIT;
839 c.hint = sa->sat_addr.s_node;
840
841 aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
842
843 /* get all llap frames raw */
844 ltflags = read_30(dev);
845 ltflags |= LT_FLAG_ALLLAP;
846 set_30 (dev,ltflags);
847
848 dev->broadcast[0] = 0xFF;
849 dev->addr_len=1;
850 dev_addr_set(dev, &aa->s_node);
851
852 return 0;
853
854 case SIOCGIFADDR:
855
856 sa->sat_addr.s_net = aa->s_net;
857 sa->sat_addr.s_node = aa->s_node;
858
859 return 0;
860
861 default:
862 return -EINVAL;
863 }
864 }
865
set_multicast_list(struct net_device * dev)866 static void set_multicast_list(struct net_device *dev)
867 {
868 /* This needs to be present to keep netatalk happy. */
869 /* Actually netatalk needs fixing! */
870 }
871
872 static int ltpc_poll_counter;
873
ltpc_poll(struct timer_list * unused)874 static void ltpc_poll(struct timer_list *unused)
875 {
876 del_timer(<pc_timer);
877
878 if(debug & DEBUG_VERBOSE) {
879 if (!ltpc_poll_counter) {
880 ltpc_poll_counter = 50;
881 printk("ltpc poll is alive\n");
882 }
883 ltpc_poll_counter--;
884 }
885
886 /* poll 20 times per second */
887 idle(ltpc_timer_dev);
888 ltpc_timer.expires = jiffies + HZ/20;
889 add_timer(<pc_timer);
890 }
891
892 /* DDP to LLAP translation */
893
ltpc_xmit(struct sk_buff * skb,struct net_device * dev)894 static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
895 {
896 /* in kernel 1.3.xx, on entry skb->data points to ddp header,
897 * and skb->len is the length of the ddp data + ddp header
898 */
899 int i;
900 struct lt_sendlap cbuf;
901 unsigned char *hdr;
902
903 cbuf.command = LT_SENDLAP;
904 cbuf.dnode = skb->data[0];
905 cbuf.laptype = skb->data[2];
906 skb_pull(skb,3); /* skip past LLAP header */
907 cbuf.length = skb->len; /* this is host order */
908 skb_reset_transport_header(skb);
909
910 if(debug & DEBUG_UPPER) {
911 printk("command ");
912 for(i=0;i<6;i++)
913 printk("%02x ",((unsigned char *)&cbuf)[i]);
914 printk("\n");
915 }
916
917 hdr = skb_transport_header(skb);
918 do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);
919
920 if(debug & DEBUG_UPPER) {
921 printk("sent %d ddp bytes\n",skb->len);
922 for (i = 0; i < skb->len; i++)
923 printk("%02x ", hdr[i]);
924 printk("\n");
925 }
926
927 dev->stats.tx_packets++;
928 dev->stats.tx_bytes += skb->len;
929
930 dev_kfree_skb(skb);
931 return NETDEV_TX_OK;
932 }
933
934 /* initialization stuff */
935
ltpc_probe_dma(int base,int dma)936 static int __init ltpc_probe_dma(int base, int dma)
937 {
938 int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
939 unsigned long timeout;
940 unsigned long f;
941
942 if (want & 1) {
943 if (request_dma(1,"ltpc")) {
944 want &= ~1;
945 } else {
946 f=claim_dma_lock();
947 disable_dma(1);
948 clear_dma_ff(1);
949 set_dma_mode(1,DMA_MODE_WRITE);
950 set_dma_addr(1,virt_to_bus(ltdmabuf));
951 set_dma_count(1,sizeof(struct lt_mem));
952 enable_dma(1);
953 release_dma_lock(f);
954 }
955 }
956 if (want & 2) {
957 if (request_dma(3,"ltpc")) {
958 want &= ~2;
959 } else {
960 f=claim_dma_lock();
961 disable_dma(3);
962 clear_dma_ff(3);
963 set_dma_mode(3,DMA_MODE_WRITE);
964 set_dma_addr(3,virt_to_bus(ltdmabuf));
965 set_dma_count(3,sizeof(struct lt_mem));
966 enable_dma(3);
967 release_dma_lock(f);
968 }
969 }
970 /* set up request */
971
972 /* FIXME -- do timings better! */
973
974 ltdmabuf[0] = LT_READMEM;
975 ltdmabuf[1] = 1; /* mailbox */
976 ltdmabuf[2] = 0; ltdmabuf[3] = 0; /* address */
977 ltdmabuf[4] = 0; ltdmabuf[5] = 1; /* read 0x0100 bytes */
978 ltdmabuf[6] = 0; /* dunno if this is necessary */
979
980 inb_p(io+1);
981 inb_p(io+0);
982 timeout = jiffies+100*HZ/100;
983 while(time_before(jiffies, timeout)) {
984 if ( 0xfa == inb_p(io+6) ) break;
985 }
986
987 inb_p(io+3);
988 inb_p(io+2);
989 while(time_before(jiffies, timeout)) {
990 if ( 0xfb == inb_p(io+6) ) break;
991 }
992
993 /* release the other dma channel (if we opened both of them) */
994
995 if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
996 want &= ~2;
997 free_dma(3);
998 }
999
1000 if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
1001 want &= ~1;
1002 free_dma(1);
1003 }
1004
1005 if (!want)
1006 return 0;
1007
1008 return (want & 2) ? 3 : 1;
1009 }
1010
1011 static const struct net_device_ops ltpc_netdev = {
1012 .ndo_start_xmit = ltpc_xmit,
1013 .ndo_do_ioctl = ltpc_ioctl,
1014 .ndo_set_rx_mode = set_multicast_list,
1015 };
1016
ltpc_probe(void)1017 static struct net_device * __init ltpc_probe(void)
1018 {
1019 struct net_device *dev;
1020 int err = -ENOMEM;
1021 int x=0,y=0;
1022 int autoirq;
1023 unsigned long f;
1024 unsigned long timeout;
1025
1026 dev = alloc_ltalkdev(sizeof(struct ltpc_private));
1027 if (!dev)
1028 goto out;
1029
1030 /* probe for the I/O port address */
1031
1032 if (io != 0x240 && request_region(0x220,8,"ltpc")) {
1033 x = inb_p(0x220+6);
1034 if ( (x!=0xff) && (x>=0xf0) ) {
1035 io = 0x220;
1036 goto got_port;
1037 }
1038 release_region(0x220,8);
1039 }
1040 if (io != 0x220 && request_region(0x240,8,"ltpc")) {
1041 y = inb_p(0x240+6);
1042 if ( (y!=0xff) && (y>=0xf0) ){
1043 io = 0x240;
1044 goto got_port;
1045 }
1046 release_region(0x240,8);
1047 }
1048
1049 /* give up in despair */
1050 printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
1051 err = -ENODEV;
1052 goto out1;
1053
1054 got_port:
1055 /* probe for the IRQ line */
1056 if (irq < 2) {
1057 unsigned long irq_mask;
1058
1059 irq_mask = probe_irq_on();
1060 /* reset the interrupt line */
1061 inb_p(io+7);
1062 inb_p(io+7);
1063 /* trigger an interrupt (I hope) */
1064 inb_p(io+6);
1065 mdelay(2);
1066 autoirq = probe_irq_off(irq_mask);
1067
1068 if (autoirq == 0) {
1069 printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
1070 } else {
1071 irq = autoirq;
1072 }
1073 }
1074
1075 /* allocate a DMA buffer */
1076 ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
1077 if (!ltdmabuf) {
1078 printk(KERN_ERR "ltpc: mem alloc failed\n");
1079 err = -ENOMEM;
1080 goto out2;
1081 }
1082
1083 ltdmacbuf = <dmabuf[800];
1084
1085 if(debug & DEBUG_VERBOSE) {
1086 printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
1087 }
1088
1089 /* reset the card */
1090
1091 inb_p(io+1);
1092 inb_p(io+3);
1093
1094 msleep(20);
1095
1096 inb_p(io+0);
1097 inb_p(io+2);
1098 inb_p(io+7); /* clear reset */
1099 inb_p(io+4);
1100 inb_p(io+5);
1101 inb_p(io+5); /* enable dma */
1102 inb_p(io+6); /* tri-state interrupt line */
1103
1104 ssleep(1);
1105
1106 /* now, figure out which dma channel we're using, unless it's
1107 already been specified */
1108 /* well, 0 is a legal DMA channel, but the LTPC card doesn't
1109 use it... */
1110 dma = ltpc_probe_dma(io, dma);
1111 if (!dma) { /* no dma channel */
1112 printk(KERN_ERR "No DMA channel found on ltpc card.\n");
1113 err = -ENODEV;
1114 goto out3;
1115 }
1116
1117 /* print out friendly message */
1118 if(irq)
1119 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
1120 else
1121 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d. Using polled mode.\n",io,dma);
1122
1123 dev->netdev_ops = <pc_netdev;
1124 dev->base_addr = io;
1125 dev->irq = irq;
1126 dev->dma = dma;
1127
1128 /* the card will want to send a result at this point */
1129 /* (I think... leaving out this part makes the kernel crash,
1130 so I put it back in...) */
1131
1132 f=claim_dma_lock();
1133 disable_dma(dma);
1134 clear_dma_ff(dma);
1135 set_dma_mode(dma,DMA_MODE_READ);
1136 set_dma_addr(dma,virt_to_bus(ltdmabuf));
1137 set_dma_count(dma,0x100);
1138 enable_dma(dma);
1139 release_dma_lock(f);
1140
1141 (void) inb_p(io+3);
1142 (void) inb_p(io+2);
1143 timeout = jiffies+100*HZ/100;
1144
1145 while(time_before(jiffies, timeout)) {
1146 if( 0xf9 == inb_p(io+6))
1147 break;
1148 schedule();
1149 }
1150
1151 if(debug & DEBUG_VERBOSE) {
1152 printk("setting up timer and irq\n");
1153 }
1154
1155 /* grab it and don't let go :-) */
1156 if (irq && request_irq( irq, ltpc_interrupt, 0, "ltpc", dev) >= 0)
1157 {
1158 (void) inb_p(io+7); /* enable interrupts from board */
1159 (void) inb_p(io+7); /* and reset irq line */
1160 } else {
1161 if( irq )
1162 printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
1163 dev->irq = 0;
1164 /* polled mode -- 20 times per second */
1165 /* this is really, really slow... should it poll more often? */
1166 ltpc_timer_dev = dev;
1167 timer_setup(<pc_timer, ltpc_poll, 0);
1168
1169 ltpc_timer.expires = jiffies + HZ/20;
1170 add_timer(<pc_timer);
1171 }
1172 err = register_netdev(dev);
1173 if (err)
1174 goto out4;
1175
1176 return NULL;
1177 out4:
1178 del_timer_sync(<pc_timer);
1179 if (dev->irq)
1180 free_irq(dev->irq, dev);
1181 out3:
1182 free_pages((unsigned long)ltdmabuf, get_order(1000));
1183 out2:
1184 release_region(io, 8);
1185 out1:
1186 free_netdev(dev);
1187 out:
1188 return ERR_PTR(err);
1189 }
1190
1191 #ifndef MODULE
1192 /* handles "ltpc=io,irq,dma" kernel command lines */
ltpc_setup(char * str)1193 static int __init ltpc_setup(char *str)
1194 {
1195 int ints[5];
1196
1197 str = get_options(str, ARRAY_SIZE(ints), ints);
1198
1199 if (ints[0] == 0) {
1200 if (str && !strncmp(str, "auto", 4)) {
1201 /* do nothing :-) */
1202 }
1203 else {
1204 /* usage message */
1205 printk (KERN_ERR
1206 "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
1207 return 0;
1208 }
1209 } else {
1210 io = ints[1];
1211 if (ints[0] > 1) {
1212 irq = ints[2];
1213 }
1214 if (ints[0] > 2) {
1215 dma = ints[3];
1216 }
1217 /* ignore any other parameters */
1218 }
1219 return 1;
1220 }
1221
1222 __setup("ltpc=", ltpc_setup);
1223 #endif
1224
1225 static struct net_device *dev_ltpc;
1226
1227 MODULE_LICENSE("GPL");
1228 module_param(debug, int, 0);
1229 module_param_hw(io, int, ioport, 0);
1230 module_param_hw(irq, int, irq, 0);
1231 module_param_hw(dma, int, dma, 0);
1232
1233
ltpc_module_init(void)1234 static int __init ltpc_module_init(void)
1235 {
1236 if(io == 0)
1237 printk(KERN_NOTICE
1238 "ltpc: Autoprobing is not recommended for modules\n");
1239
1240 dev_ltpc = ltpc_probe();
1241 return PTR_ERR_OR_ZERO(dev_ltpc);
1242 }
1243 module_init(ltpc_module_init);
1244
ltpc_cleanup(void)1245 static void __exit ltpc_cleanup(void)
1246 {
1247
1248 if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
1249 unregister_netdev(dev_ltpc);
1250
1251 del_timer_sync(<pc_timer);
1252
1253 if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
1254
1255 if (dev_ltpc->irq)
1256 free_irq(dev_ltpc->irq, dev_ltpc);
1257
1258 if(debug & DEBUG_VERBOSE) printk("freeing dma\n");
1259
1260 if (dev_ltpc->dma)
1261 free_dma(dev_ltpc->dma);
1262
1263 if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");
1264
1265 if (dev_ltpc->base_addr)
1266 release_region(dev_ltpc->base_addr,8);
1267
1268 free_netdev(dev_ltpc);
1269
1270 if(debug & DEBUG_VERBOSE) printk("free_pages\n");
1271
1272 free_pages( (unsigned long) ltdmabuf, get_order(1000));
1273
1274 if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
1275 }
1276
1277 module_exit(ltpc_cleanup);
1278