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 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 }
646
647
do_write(struct net_device * dev,void * cbuf,int cbuflen,void * dbuf,int dbuflen)648 static int do_write(struct net_device *dev, void *cbuf, int cbuflen,
649 void *dbuf, int dbuflen)
650 {
651
652 int i = getmbox();
653 int ret;
654
655 if(i) {
656 qels[i].cbuf = cbuf;
657 qels[i].cbuflen = cbuflen;
658 qels[i].dbuf = dbuf;
659 qels[i].dbuflen = dbuflen;
660 qels[i].QWrite = 1;
661 qels[i].mailbox = i; /* this should be initted rather */
662 enQ(&qels[i]);
663 idle(dev);
664 ret = mailbox[i];
665 mboxinuse[i]=0;
666 return ret;
667 }
668 printk("ltpc: could not allocate mbox\n");
669 return -1;
670 }
671
do_read(struct net_device * dev,void * cbuf,int cbuflen,void * dbuf,int dbuflen)672 static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
673 void *dbuf, int dbuflen)
674 {
675
676 int i = getmbox();
677 int ret;
678
679 if(i) {
680 qels[i].cbuf = cbuf;
681 qels[i].cbuflen = cbuflen;
682 qels[i].dbuf = dbuf;
683 qels[i].dbuflen = dbuflen;
684 qels[i].QWrite = 0;
685 qels[i].mailbox = i; /* this should be initted rather */
686 enQ(&qels[i]);
687 idle(dev);
688 ret = mailbox[i];
689 mboxinuse[i]=0;
690 return ret;
691 }
692 printk("ltpc: could not allocate mbox\n");
693 return -1;
694 }
695
696 /* end of idle handlers -- what should be seen is do_read, do_write */
697
698 static struct timer_list ltpc_timer;
699 static struct net_device *ltpc_timer_dev;
700
701 static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
702
read_30(struct net_device * dev)703 static int read_30 ( struct net_device *dev)
704 {
705 lt_command c;
706 c.getflags.command = LT_GETFLAGS;
707 return do_read(dev, &c, sizeof(c.getflags),&c,0);
708 }
709
set_30(struct net_device * dev,int x)710 static int set_30 (struct net_device *dev,int x)
711 {
712 lt_command c;
713 c.setflags.command = LT_SETFLAGS;
714 c.setflags.flags = x;
715 return do_write(dev, &c, sizeof(c.setflags),&c,0);
716 }
717
718 /* LLAP to DDP translation */
719
sendup_buffer(struct net_device * dev)720 static int sendup_buffer (struct net_device *dev)
721 {
722 /* on entry, command is in ltdmacbuf, data in ltdmabuf */
723 /* called from idle, non-reentrant */
724
725 int dnode, snode, llaptype, len;
726 int sklen;
727 struct sk_buff *skb;
728 struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;
729
730 if (ltc->command != LT_RCVLAP) {
731 printk("unknown command 0x%02x from ltpc card\n",ltc->command);
732 return -1;
733 }
734 dnode = ltc->dnode;
735 snode = ltc->snode;
736 llaptype = ltc->laptype;
737 len = ltc->length;
738
739 sklen = len;
740 if (llaptype == 1)
741 sklen += 8; /* correct for short ddp */
742 if(sklen > 800) {
743 printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
744 dev->name,sklen);
745 return -1;
746 }
747
748 if ( (llaptype==0) || (llaptype>2) ) {
749 printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
750 return -1;
751 }
752
753
754 skb = dev_alloc_skb(3+sklen);
755 if (skb == NULL)
756 {
757 printk("%s: dropping packet due to memory squeeze.\n",
758 dev->name);
759 return -1;
760 }
761 skb->dev = dev;
762
763 if (sklen > len)
764 skb_reserve(skb,8);
765 skb_put(skb,len+3);
766 skb->protocol = htons(ETH_P_LOCALTALK);
767 /* add LLAP header */
768 skb->data[0] = dnode;
769 skb->data[1] = snode;
770 skb->data[2] = llaptype;
771 skb_reset_mac_header(skb); /* save pointer to llap header */
772 skb_pull(skb,3);
773
774 /* copy ddp(s,e)hdr + contents */
775 skb_copy_to_linear_data(skb, ltdmabuf, len);
776
777 skb_reset_transport_header(skb);
778
779 dev->stats.rx_packets++;
780 dev->stats.rx_bytes += skb->len;
781
782 /* toss it onwards */
783 netif_rx(skb);
784 return 0;
785 }
786
787 /* the handler for the board interrupt */
788
789 static irqreturn_t
ltpc_interrupt(int irq,void * dev_id)790 ltpc_interrupt(int irq, void *dev_id)
791 {
792 struct net_device *dev = dev_id;
793
794 if (dev==NULL) {
795 printk("ltpc_interrupt: unknown device.\n");
796 return IRQ_NONE;
797 }
798
799 inb_p(dev->base_addr+6); /* disable further interrupts from board */
800
801 idle(dev); /* handle whatever is coming in */
802
803 /* idle re-enables interrupts from board */
804
805 return IRQ_HANDLED;
806 }
807
808 /***
809 *
810 * The ioctls that the driver responds to are:
811 *
812 * SIOCSIFADDR -- do probe using the passed node hint.
813 * SIOCGIFADDR -- return net, node.
814 *
815 * some of this stuff should be done elsewhere.
816 *
817 ***/
818
ltpc_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)819 static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
820 {
821 struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
822 /* we'll keep the localtalk node address in dev->pa_addr */
823 struct ltpc_private *ltpc_priv = netdev_priv(dev);
824 struct atalk_addr *aa = <pc_priv->my_addr;
825 struct lt_init c;
826 int ltflags;
827
828 if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
829
830 switch(cmd) {
831 case SIOCSIFADDR:
832
833 aa->s_net = sa->sat_addr.s_net;
834
835 /* this does the probe and returns the node addr */
836 c.command = LT_INIT;
837 c.hint = sa->sat_addr.s_node;
838
839 aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
840
841 /* get all llap frames raw */
842 ltflags = read_30(dev);
843 ltflags |= LT_FLAG_ALLLAP;
844 set_30 (dev,ltflags);
845
846 dev->broadcast[0] = 0xFF;
847 dev->dev_addr[0] = aa->s_node;
848
849 dev->addr_len=1;
850
851 return 0;
852
853 case SIOCGIFADDR:
854
855 sa->sat_addr.s_net = aa->s_net;
856 sa->sat_addr.s_node = aa->s_node;
857
858 return 0;
859
860 default:
861 return -EINVAL;
862 }
863 }
864
set_multicast_list(struct net_device * dev)865 static void set_multicast_list(struct net_device *dev)
866 {
867 /* This needs to be present to keep netatalk happy. */
868 /* Actually netatalk needs fixing! */
869 }
870
871 static int ltpc_poll_counter;
872
ltpc_poll(struct timer_list * unused)873 static void ltpc_poll(struct timer_list *unused)
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 /* poll 20 times per second */
886 idle(ltpc_timer_dev);
887 ltpc_timer.expires = jiffies + HZ/20;
888 add_timer(<pc_timer);
889 }
890
891 /* DDP to LLAP translation */
892
ltpc_xmit(struct sk_buff * skb,struct net_device * dev)893 static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
894 {
895 /* in kernel 1.3.xx, on entry skb->data points to ddp header,
896 * and skb->len is the length of the ddp data + ddp header
897 */
898 int i;
899 struct lt_sendlap cbuf;
900 unsigned char *hdr;
901
902 cbuf.command = LT_SENDLAP;
903 cbuf.dnode = skb->data[0];
904 cbuf.laptype = skb->data[2];
905 skb_pull(skb,3); /* skip past LLAP header */
906 cbuf.length = skb->len; /* this is host order */
907 skb_reset_transport_header(skb);
908
909 if(debug & DEBUG_UPPER) {
910 printk("command ");
911 for(i=0;i<6;i++)
912 printk("%02x ",((unsigned char *)&cbuf)[i]);
913 printk("\n");
914 }
915
916 hdr = skb_transport_header(skb);
917 do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);
918
919 if(debug & DEBUG_UPPER) {
920 printk("sent %d ddp bytes\n",skb->len);
921 for (i = 0; i < skb->len; i++)
922 printk("%02x ", hdr[i]);
923 printk("\n");
924 }
925
926 dev->stats.tx_packets++;
927 dev->stats.tx_bytes += skb->len;
928
929 dev_kfree_skb(skb);
930 return NETDEV_TX_OK;
931 }
932
933 /* initialization stuff */
934
ltpc_probe_dma(int base,int dma)935 static int __init ltpc_probe_dma(int base, int dma)
936 {
937 int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
938 unsigned long timeout;
939 unsigned long f;
940
941 if (want & 1) {
942 if (request_dma(1,"ltpc")) {
943 want &= ~1;
944 } else {
945 f=claim_dma_lock();
946 disable_dma(1);
947 clear_dma_ff(1);
948 set_dma_mode(1,DMA_MODE_WRITE);
949 set_dma_addr(1,virt_to_bus(ltdmabuf));
950 set_dma_count(1,sizeof(struct lt_mem));
951 enable_dma(1);
952 release_dma_lock(f);
953 }
954 }
955 if (want & 2) {
956 if (request_dma(3,"ltpc")) {
957 want &= ~2;
958 } else {
959 f=claim_dma_lock();
960 disable_dma(3);
961 clear_dma_ff(3);
962 set_dma_mode(3,DMA_MODE_WRITE);
963 set_dma_addr(3,virt_to_bus(ltdmabuf));
964 set_dma_count(3,sizeof(struct lt_mem));
965 enable_dma(3);
966 release_dma_lock(f);
967 }
968 }
969 /* set up request */
970
971 /* FIXME -- do timings better! */
972
973 ltdmabuf[0] = LT_READMEM;
974 ltdmabuf[1] = 1; /* mailbox */
975 ltdmabuf[2] = 0; ltdmabuf[3] = 0; /* address */
976 ltdmabuf[4] = 0; ltdmabuf[5] = 1; /* read 0x0100 bytes */
977 ltdmabuf[6] = 0; /* dunno if this is necessary */
978
979 inb_p(io+1);
980 inb_p(io+0);
981 timeout = jiffies+100*HZ/100;
982 while(time_before(jiffies, timeout)) {
983 if ( 0xfa == inb_p(io+6) ) break;
984 }
985
986 inb_p(io+3);
987 inb_p(io+2);
988 while(time_before(jiffies, timeout)) {
989 if ( 0xfb == inb_p(io+6) ) break;
990 }
991
992 /* release the other dma channel (if we opened both of them) */
993
994 if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
995 want &= ~2;
996 free_dma(3);
997 }
998
999 if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
1000 want &= ~1;
1001 free_dma(1);
1002 }
1003
1004 if (!want)
1005 return 0;
1006
1007 return (want & 2) ? 3 : 1;
1008 }
1009
1010 static const struct net_device_ops ltpc_netdev = {
1011 .ndo_start_xmit = ltpc_xmit,
1012 .ndo_do_ioctl = ltpc_ioctl,
1013 .ndo_set_rx_mode = set_multicast_list,
1014 };
1015
ltpc_probe(void)1016 struct net_device * __init ltpc_probe(void)
1017 {
1018 struct net_device *dev;
1019 int err = -ENOMEM;
1020 int x=0,y=0;
1021 int autoirq;
1022 unsigned long f;
1023 unsigned long timeout;
1024
1025 dev = alloc_ltalkdev(sizeof(struct ltpc_private));
1026 if (!dev)
1027 goto out;
1028
1029 /* probe for the I/O port address */
1030
1031 if (io != 0x240 && request_region(0x220,8,"ltpc")) {
1032 x = inb_p(0x220+6);
1033 if ( (x!=0xff) && (x>=0xf0) ) {
1034 io = 0x220;
1035 goto got_port;
1036 }
1037 release_region(0x220,8);
1038 }
1039 if (io != 0x220 && request_region(0x240,8,"ltpc")) {
1040 y = inb_p(0x240+6);
1041 if ( (y!=0xff) && (y>=0xf0) ){
1042 io = 0x240;
1043 goto got_port;
1044 }
1045 release_region(0x240,8);
1046 }
1047
1048 /* give up in despair */
1049 printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
1050 err = -ENODEV;
1051 goto out1;
1052
1053 got_port:
1054 /* probe for the IRQ line */
1055 if (irq < 2) {
1056 unsigned long irq_mask;
1057
1058 irq_mask = probe_irq_on();
1059 /* reset the interrupt line */
1060 inb_p(io+7);
1061 inb_p(io+7);
1062 /* trigger an interrupt (I hope) */
1063 inb_p(io+6);
1064 mdelay(2);
1065 autoirq = probe_irq_off(irq_mask);
1066
1067 if (autoirq == 0) {
1068 printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
1069 } else {
1070 irq = autoirq;
1071 }
1072 }
1073
1074 /* allocate a DMA buffer */
1075 ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
1076 if (!ltdmabuf) {
1077 printk(KERN_ERR "ltpc: mem alloc failed\n");
1078 err = -ENOMEM;
1079 goto out2;
1080 }
1081
1082 ltdmacbuf = <dmabuf[800];
1083
1084 if(debug & DEBUG_VERBOSE) {
1085 printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
1086 }
1087
1088 /* reset the card */
1089
1090 inb_p(io+1);
1091 inb_p(io+3);
1092
1093 msleep(20);
1094
1095 inb_p(io+0);
1096 inb_p(io+2);
1097 inb_p(io+7); /* clear reset */
1098 inb_p(io+4);
1099 inb_p(io+5);
1100 inb_p(io+5); /* enable dma */
1101 inb_p(io+6); /* tri-state interrupt line */
1102
1103 ssleep(1);
1104
1105 /* now, figure out which dma channel we're using, unless it's
1106 already been specified */
1107 /* well, 0 is a legal DMA channel, but the LTPC card doesn't
1108 use it... */
1109 dma = ltpc_probe_dma(io, dma);
1110 if (!dma) { /* no dma channel */
1111 printk(KERN_ERR "No DMA channel found on ltpc card.\n");
1112 err = -ENODEV;
1113 goto out3;
1114 }
1115
1116 /* print out friendly message */
1117 if(irq)
1118 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
1119 else
1120 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d. Using polled mode.\n",io,dma);
1121
1122 dev->netdev_ops = <pc_netdev;
1123 dev->base_addr = io;
1124 dev->irq = irq;
1125 dev->dma = dma;
1126
1127 /* the card will want to send a result at this point */
1128 /* (I think... leaving out this part makes the kernel crash,
1129 so I put it back in...) */
1130
1131 f=claim_dma_lock();
1132 disable_dma(dma);
1133 clear_dma_ff(dma);
1134 set_dma_mode(dma,DMA_MODE_READ);
1135 set_dma_addr(dma,virt_to_bus(ltdmabuf));
1136 set_dma_count(dma,0x100);
1137 enable_dma(dma);
1138 release_dma_lock(f);
1139
1140 (void) inb_p(io+3);
1141 (void) inb_p(io+2);
1142 timeout = jiffies+100*HZ/100;
1143
1144 while(time_before(jiffies, timeout)) {
1145 if( 0xf9 == inb_p(io+6))
1146 break;
1147 schedule();
1148 }
1149
1150 if(debug & DEBUG_VERBOSE) {
1151 printk("setting up timer and irq\n");
1152 }
1153
1154 /* grab it and don't let go :-) */
1155 if (irq && request_irq( irq, ltpc_interrupt, 0, "ltpc", dev) >= 0)
1156 {
1157 (void) inb_p(io+7); /* enable interrupts from board */
1158 (void) inb_p(io+7); /* and reset irq line */
1159 } else {
1160 if( irq )
1161 printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
1162 dev->irq = 0;
1163 /* polled mode -- 20 times per second */
1164 /* this is really, really slow... should it poll more often? */
1165 ltpc_timer_dev = dev;
1166 timer_setup(<pc_timer, ltpc_poll, 0);
1167
1168 ltpc_timer.expires = jiffies + HZ/20;
1169 add_timer(<pc_timer);
1170 }
1171 err = register_netdev(dev);
1172 if (err)
1173 goto out4;
1174
1175 return NULL;
1176 out4:
1177 del_timer_sync(<pc_timer);
1178 if (dev->irq)
1179 free_irq(dev->irq, dev);
1180 out3:
1181 free_pages((unsigned long)ltdmabuf, get_order(1000));
1182 out2:
1183 release_region(io, 8);
1184 out1:
1185 free_netdev(dev);
1186 out:
1187 return ERR_PTR(err);
1188 }
1189
1190 #ifndef MODULE
1191 /* handles "ltpc=io,irq,dma" kernel command lines */
ltpc_setup(char * str)1192 static int __init ltpc_setup(char *str)
1193 {
1194 int ints[5];
1195
1196 str = get_options(str, ARRAY_SIZE(ints), ints);
1197
1198 if (ints[0] == 0) {
1199 if (str && !strncmp(str, "auto", 4)) {
1200 /* do nothing :-) */
1201 }
1202 else {
1203 /* usage message */
1204 printk (KERN_ERR
1205 "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
1206 return 0;
1207 }
1208 } else {
1209 io = ints[1];
1210 if (ints[0] > 1) {
1211 irq = ints[2];
1212 }
1213 if (ints[0] > 2) {
1214 dma = ints[3];
1215 }
1216 /* ignore any other parameters */
1217 }
1218 return 1;
1219 }
1220
1221 __setup("ltpc=", ltpc_setup);
1222 #endif /* MODULE */
1223
1224 static struct net_device *dev_ltpc;
1225
1226 #ifdef MODULE
1227
1228 MODULE_LICENSE("GPL");
1229 module_param(debug, int, 0);
1230 module_param_hw(io, int, ioport, 0);
1231 module_param_hw(irq, int, irq, 0);
1232 module_param_hw(dma, int, dma, 0);
1233
1234
ltpc_module_init(void)1235 static int __init ltpc_module_init(void)
1236 {
1237 if(io == 0)
1238 printk(KERN_NOTICE
1239 "ltpc: Autoprobing is not recommended for modules\n");
1240
1241 dev_ltpc = ltpc_probe();
1242 return PTR_ERR_OR_ZERO(dev_ltpc);
1243 }
1244 module_init(ltpc_module_init);
1245 #endif
1246
ltpc_cleanup(void)1247 static void __exit ltpc_cleanup(void)
1248 {
1249
1250 if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
1251 unregister_netdev(dev_ltpc);
1252
1253 del_timer_sync(<pc_timer);
1254
1255 if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
1256
1257 if (dev_ltpc->irq)
1258 free_irq(dev_ltpc->irq, dev_ltpc);
1259
1260 if(debug & DEBUG_VERBOSE) printk("freeing dma\n");
1261
1262 if (dev_ltpc->dma)
1263 free_dma(dev_ltpc->dma);
1264
1265 if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");
1266
1267 if (dev_ltpc->base_addr)
1268 release_region(dev_ltpc->base_addr,8);
1269
1270 free_netdev(dev_ltpc);
1271
1272 if(debug & DEBUG_VERBOSE) printk("free_pages\n");
1273
1274 free_pages( (unsigned long) ltdmabuf, get_order(1000));
1275
1276 if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
1277 }
1278
1279 module_exit(ltpc_cleanup);
1280
