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net: Remove unused parameter of xfrm_gen_index()
[linux-2.6-block.git] / drivers / net / appletalk / ltpc.c
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1da177e4
LT		 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 */
200static int debug;
201#define DEBUG_VERBOSE 1
202#define DEBUG_UPPER 2
203#define DEBUG_LOWER 4
204
205static int io;
206static int irq;
207static 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
239static DEFINE_SPINLOCK(txqueue_lock);
240static DEFINE_SPINLOCK(mbox_lock);
241
242/* function prototypes */
243static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
244 void *dbuf, int dbuflen);
245static int sendup_buffer (struct net_device *dev);
246
247/* Dma Memory related stuff, cribbed directly from 3c505.c */
248
249static 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 */
257static unsigned char *ltdmabuf;
258static unsigned char *ltdmacbuf;
259
260/* private struct, holds our appletalk address */
261
262struct ltpc_private
263{
264 struct net_device_stats stats;
265 struct atalk_addr my_addr;
266};
267
268/* transmit queue element struct */
269
270struct 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
284static struct xmitQel *xmQhd, *xmQtl;
285
286static 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
304static 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 */
331static struct xmitQel qels[16];
332
333/* and their corresponding mailboxes */
334static unsigned char mailbox[16];
335static unsigned char mboxinuse[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
336
337static 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
354static 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 */
370static 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 */
394static 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
416static 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
444static 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
467static 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 */
488static unsigned char rescbuf[2] = {LT_GETRESULT,0};
489static unsigned char resdbuf[2];
490
491static 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
497static 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
522loop:
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
632done:
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
649static 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
673static 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
699static struct timer_list ltpc_timer;
700
701static int ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
702static struct net_device_stats *ltpc_get_stats(struct net_device *dev);
703
704static 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
711static 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
721static 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 net_device_stats *stats = &((struct ltpc_private *)dev->priv)->stats;
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;
459a98ed 773 skb_reset_mac_header(skb); /* save pointer to llap header */
1da177e4
LT		 774 skb_pull(skb,3);
775
776 /* copy ddp(s,e)hdr + contents */
27d7ff46 777 skb_copy_to_linear_data(skb, ltdmabuf, len);
1da177e4 778
badff6d0 779 skb_reset_transport_header(skb);
1da177e4
LT		 780
781 stats->rx_packets++;
782 stats->rx_bytes+=skb->len;
783
784 /* toss it onwards */
785 netif_rx(skb);
1da177e4
LT		 786 return 0;
787}
788
789/* the handler for the board interrupt */
790
791static irqreturn_t
7d12e780 792ltpc_interrupt(int irq, void *dev_id)
1da177e4
LT		 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
821static 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 atalk_addr *aa = &((struct ltpc_private *)dev->priv)->my_addr;
826 struct lt_init c;
827 int ltflags;
828
829 if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
830
831 switch(cmd) {
832 case SIOCSIFADDR:
833
834 aa->s_net = sa->sat_addr.s_net;
835
836 /* this does the probe and returns the node addr */
837 c.command = LT_INIT;
838 c.hint = sa->sat_addr.s_node;
839
840 aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
841
842 /* get all llap frames raw */
843 ltflags = read_30(dev);
844 ltflags |= LT_FLAG_ALLLAP;
845 set_30 (dev,ltflags);
846
847 dev->broadcast[0] = 0xFF;
848 dev->dev_addr[0] = aa->s_node;
849
850 dev->addr_len=1;
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
866static 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
1da177e4
LT		 872static int ltpc_poll_counter;
873
874static void ltpc_poll(unsigned long l)
875{
876 struct net_device *dev = (struct net_device *) l;
877
878 del_timer(&ltpc_timer);
879
880 if(debug & DEBUG_VERBOSE) {
881 if (!ltpc_poll_counter) {
882 ltpc_poll_counter = 50;
883 printk("ltpc poll is alive\n");
884 }
885 ltpc_poll_counter--;
886 }
887
888 if (!dev)
889 return; /* we've been downed */
890
891 /* poll 20 times per second */
892 idle(dev);
893 ltpc_timer.expires = jiffies + HZ/20;
894
895 add_timer(&ltpc_timer);
896}
897
898/* DDP to LLAP translation */
899
900static int ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
901{
902 /* in kernel 1.3.xx, on entry skb->data points to ddp header,
903 * and skb->len is the length of the ddp data + ddp header
904 */
905
906 struct net_device_stats *stats = &((struct ltpc_private *)dev->priv)->stats;
907
908 int i;
909 struct lt_sendlap cbuf;
9c70220b 910 unsigned char *hdr;
1da177e4
LT		 911
912 cbuf.command = LT_SENDLAP;
913 cbuf.dnode = skb->data[0];
914 cbuf.laptype = skb->data[2];
915 skb_pull(skb,3); /* skip past LLAP header */
916 cbuf.length = skb->len; /* this is host order */
badff6d0 917 skb_reset_transport_header(skb);
1da177e4
LT		 918
919 if(debug & DEBUG_UPPER) {
920 printk("command ");
921 for(i=0;i<6;i++)
922 printk("%02x ",((unsigned char *)&cbuf)[i]);
923 printk("\n");
924 }
925
9c70220b
ACM		 926 hdr = skb_transport_header(skb);
927 do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);
1da177e4
LT		 928
929 if(debug & DEBUG_UPPER) {
930 printk("sent %d ddp bytes\n",skb->len);
9c70220b
ACM		 931 for (i = 0; i < skb->len; i++)
932 printk("%02x ", hdr[i]);
1da177e4
LT		 933 printk("\n");
934 }
935
936 stats->tx_packets++;
937 stats->tx_bytes+=skb->len;
938
939 dev_kfree_skb(skb);
940 return 0;
941}
942
943static struct net_device_stats *ltpc_get_stats(struct net_device *dev)
944{
945 struct net_device_stats *stats = &((struct ltpc_private *) dev->priv)->stats;
946 return stats;
947}
948
949/* initialization stuff */
950
951static int __init ltpc_probe_dma(int base, int dma)
952{
953 int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
954 unsigned long timeout;
955 unsigned long f;
956
957 if (want & 1) {
958 if (request_dma(1,"ltpc")) {
959 want &= ~1;
960 } else {
961 f=claim_dma_lock();
962 disable_dma(1);
963 clear_dma_ff(1);
964 set_dma_mode(1,DMA_MODE_WRITE);
965 set_dma_addr(1,virt_to_bus(ltdmabuf));
966 set_dma_count(1,sizeof(struct lt_mem));
967 enable_dma(1);
968 release_dma_lock(f);
969 }
970 }
971 if (want & 2) {
972 if (request_dma(3,"ltpc")) {
973 want &= ~2;
974 } else {
975 f=claim_dma_lock();
976 disable_dma(3);
977 clear_dma_ff(3);
978 set_dma_mode(3,DMA_MODE_WRITE);
979 set_dma_addr(3,virt_to_bus(ltdmabuf));
980 set_dma_count(3,sizeof(struct lt_mem));
981 enable_dma(3);
982 release_dma_lock(f);
983 }
984 }
985 /* set up request */
986
987 /* FIXME -- do timings better! */
988
989 ltdmabuf[0] = LT_READMEM;
990 ltdmabuf[1] = 1; /* mailbox */
991 ltdmabuf[2] = 0; ltdmabuf[3] = 0; /* address */
992 ltdmabuf[4] = 0; ltdmabuf[5] = 1; /* read 0x0100 bytes */
993 ltdmabuf[6] = 0; /* dunno if this is necessary */
994
995 inb_p(io+1);
996 inb_p(io+0);
997 timeout = jiffies+100*HZ/100;
998 while(time_before(jiffies, timeout)) {
999 if ( 0xfa == inb_p(io+6) ) break;
1000 }
1001
1002 inb_p(io+3);
1003 inb_p(io+2);
1004 while(time_before(jiffies, timeout)) {
1005 if ( 0xfb == inb_p(io+6) ) break;
1006 }
1007
1008 /* release the other dma channel (if we opened both of them) */
1009
1010 if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
1011 want &= ~2;
1012 free_dma(3);
1013 }
1014
1015 if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
1016 want &= ~1;
1017 free_dma(1);
1018 }
1019
1020 if (!want)
1021 return 0;
1022
1023 return (want & 2) ? 3 : 1;
1024}
1025
1026struct net_device * __init ltpc_probe(void)
1027{
1028 struct net_device *dev;
1029 int err = -ENOMEM;
1030 int x=0,y=0;
1031 int autoirq;
1032 unsigned long f;
1033 unsigned long timeout;
1034
3ef4e9a8 1035 dev = alloc_ltalkdev(sizeof(struct ltpc_private));
1da177e4
LT		 1036 if (!dev)
1037 goto out;
1038
1da177e4
LT		 1039 /* probe for the I/O port address */
1040
1041 if (io != 0x240 && request_region(0x220,8,"ltpc")) {
1042 x = inb_p(0x220+6);
1043 if ( (x!=0xff) && (x>=0xf0) ) {
1044 io = 0x220;
1045 goto got_port;
1046 }
1047 release_region(0x220,8);
1048 }
1049 if (io != 0x220 && request_region(0x240,8,"ltpc")) {
1050 y = inb_p(0x240+6);
1051 if ( (y!=0xff) && (y>=0xf0) ){
1052 io = 0x240;
1053 goto got_port;
1054 }
1055 release_region(0x240,8);
1056 }
1057
1058 /* give up in despair */
1059 printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
1060 err = -ENODEV;
1061 goto out1;
1062
1063 got_port:
1064 /* probe for the IRQ line */
1065 if (irq < 2) {
1066 unsigned long irq_mask;
1067
1068 irq_mask = probe_irq_on();
1069 /* reset the interrupt line */
1070 inb_p(io+7);
1071 inb_p(io+7);
1072 /* trigger an interrupt (I hope) */
1073 inb_p(io+6);
1074 mdelay(2);
1075 autoirq = probe_irq_off(irq_mask);
1076
1077 if (autoirq == 0) {
1078 printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
1079 } else {
1080 irq = autoirq;
1081 }
1082 }
1083
1084 /* allocate a DMA buffer */
1085 ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
1086 if (!ltdmabuf) {
1087 printk(KERN_ERR "ltpc: mem alloc failed\n");
1088 err = -ENOMEM;
1089 goto out2;
1090 }
1091
1092 ltdmacbuf = &ltdmabuf[800];
1093
1094 if(debug & DEBUG_VERBOSE) {
1095 printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
1096 }
1097
1098 /* reset the card */
1099
1100 inb_p(io+1);
1101 inb_p(io+3);
1102
2c4ee8f9 1103 msleep(20);
1da177e4
LT		 1104
1105 inb_p(io+0);
1106 inb_p(io+2);
1107 inb_p(io+7); /* clear reset */
1108 inb_p(io+4);
1109 inb_p(io+5);
1110 inb_p(io+5); /* enable dma */
1111 inb_p(io+6); /* tri-state interrupt line */
1112
2c4ee8f9 1113 ssleep(1);
1da177e4
LT		 1114
1115 /* now, figure out which dma channel we're using, unless it's
1116 already been specified */
1117 /* well, 0 is a legal DMA channel, but the LTPC card doesn't
1118 use it... */
1119 dma = ltpc_probe_dma(io, dma);
1120 if (!dma) { /* no dma channel */
1121 printk(KERN_ERR "No DMA channel found on ltpc card.\n");
1122 err = -ENODEV;
1123 goto out3;
1124 }
1125
1126 /* print out friendly message */
1127 if(irq)
1128 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
1129 else
1130 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d. Using polled mode.\n",io,dma);
1131
1132 /* Fill in the fields of the device structure with ethernet-generic values. */
1133 dev->hard_start_xmit = ltpc_xmit;
1da177e4
LT		 1134 dev->get_stats = ltpc_get_stats;
1135
1136 /* add the ltpc-specific things */
1137 dev->do_ioctl = &ltpc_ioctl;
1138
1139 dev->set_multicast_list = &set_multicast_list;
1140 dev->mc_list = NULL;
1141 dev->base_addr = io;
1142 dev->irq = irq;
1143 dev->dma = dma;
1144
1145 /* the card will want to send a result at this point */
1146 /* (I think... leaving out this part makes the kernel crash,
1147 so I put it back in...) */
1148
1149 f=claim_dma_lock();
1150 disable_dma(dma);
1151 clear_dma_ff(dma);
1152 set_dma_mode(dma,DMA_MODE_READ);
1153 set_dma_addr(dma,virt_to_bus(ltdmabuf));
1154 set_dma_count(dma,0x100);
1155 enable_dma(dma);
1156 release_dma_lock(f);
1157
1158 (void) inb_p(io+3);
1159 (void) inb_p(io+2);
1160 timeout = jiffies+100*HZ/100;
1161
1162 while(time_before(jiffies, timeout)) {
1163 if( 0xf9 == inb_p(io+6))
1164 break;
1165 schedule();
1166 }
1167
1168 if(debug & DEBUG_VERBOSE) {
1169 printk("setting up timer and irq\n");
1170 }
1171
1172 /* grab it and don't let go :-) */
1173 if (irq && request_irq( irq, &ltpc_interrupt, 0, "ltpc", dev) >= 0)
1174 {
1175 (void) inb_p(io+7); /* enable interrupts from board */
1176 (void) inb_p(io+7); /* and reset irq line */
1177 } else {
1178 if( irq )
1179 printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
1180 dev->irq = 0;
1181 /* polled mode -- 20 times per second */
1182 /* this is really, really slow... should it poll more often? */
1183 init_timer(&ltpc_timer);
1184 ltpc_timer.function=ltpc_poll;
1185 ltpc_timer.data = (unsigned long) dev;
1186
1187 ltpc_timer.expires = jiffies + HZ/20;
1188 add_timer(&ltpc_timer);
1189 }
1190 err = register_netdev(dev);
1191 if (err)
1192 goto out4;
1193
1194 return NULL;
1195out4:
1196 del_timer_sync(&ltpc_timer);
1197 if (dev->irq)
1198 free_irq(dev->irq, dev);
1199out3:
1200 free_pages((unsigned long)ltdmabuf, get_order(1000));
1201out2:
1202 release_region(io, 8);
1203out1:
1204 free_netdev(dev);
1205out:
1206 return ERR_PTR(err);
1207}
1208
1209#ifndef MODULE
1210/* handles "ltpc=io,irq,dma" kernel command lines */
1211static int __init ltpc_setup(char *str)
1212{
1213 int ints[5];
1214
1215 str = get_options(str, ARRAY_SIZE(ints), ints);
1216
1217 if (ints[0] == 0) {
1218 if (str && !strncmp(str, "auto", 4)) {
1219 /* do nothing :-) */
1220 }
1221 else {
1222 /* usage message */
1223 printk (KERN_ERR
1224 "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
1225 return 0;
1226 }
1227 } else {
1228 io = ints[1];
1229 if (ints[0] > 1) {
1230 irq = ints[2];
1231 }
1232 if (ints[0] > 2) {
1233 dma = ints[3];
1234 }
1235 /* ignore any other paramters */
1236 }
1237 return 1;
1238}
1239
1240__setup("ltpc=", ltpc_setup);
1241#endif /* MODULE */
1242
1243static struct net_device *dev_ltpc;
1244
1245#ifdef MODULE
1246
1247MODULE_LICENSE("GPL");
1248module_param(debug, int, 0);
1249module_param(io, int, 0);
1250module_param(irq, int, 0);
1251module_param(dma, int, 0);
1252
1253
32c98747 1254static int __init ltpc_module_init(void)
1da177e4
LT		 1255{
1256 if(io == 0)
1257 printk(KERN_NOTICE
1258 "ltpc: Autoprobing is not recommended for modules\n");
1259
1260 dev_ltpc = ltpc_probe();
1261 if (IS_ERR(dev_ltpc))
1262 return PTR_ERR(dev_ltpc);
1263 return 0;
1264}
32c98747 1265module_init(ltpc_module_init);
1da177e4
LT		 1266#endif
1267
1268static void __exit ltpc_cleanup(void)
1269{
1270
1271 if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
1272 unregister_netdev(dev_ltpc);
1273
1274 ltpc_timer.data = 0; /* signal the poll routine that we're done */
1275
1276 del_timer_sync(&ltpc_timer);
1277
1278 if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
1279
1280 if (dev_ltpc->irq)
1281 free_irq(dev_ltpc->irq, dev_ltpc);
1282
1283 if(debug & DEBUG_VERBOSE) printk("freeing dma\n");
1284
1285 if (dev_ltpc->dma)
1286 free_dma(dev_ltpc->dma);
1287
1288 if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");
1289
1290 if (dev_ltpc->base_addr)
1291 release_region(dev_ltpc->base_addr,8);
1292
1293 free_netdev(dev_ltpc);
1294
1295 if(debug & DEBUG_VERBOSE) printk("free_pages\n");
1296
1297 free_pages( (unsigned long) ltdmabuf, get_order(1000));
1298
1299 if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
1300}
1301
1302module_exit(ltpc_cleanup);
Linux 6.x block layer and io_uring tree(s)