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/string.h>
 219#include <linux/errno.h>
 220#include <linux/init.h>
 221#include <linux/netdevice.h>
 222#include <linux/etherdevice.h>
 223#include <linux/skbuff.h>
 224#include <linux/if_arp.h>
 225#include <linux/if_ltalk.h>
 226#include <linux/delay.h>
 227#include <linux/timer.h>
 228#include <linux/atalk.h>
 229#include <linux/bitops.h>
 230#include <linux/gfp.h>
 231
 
 
 232#include <asm/dma.h>
 233#include <asm/io.h>
 234
 235/* our stuff */
 236#include "ltpc.h"
 237
 238static DEFINE_SPINLOCK(txqueue_lock);
 239static DEFINE_SPINLOCK(mbox_lock);
 240
 241/* function prototypes */
 242static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
 243	void *dbuf, int dbuflen);
 244static int sendup_buffer (struct net_device *dev);
 245
 246/* Dma Memory related stuff, cribbed directly from 3c505.c */
 247
 248static unsigned long dma_mem_alloc(int size)
 249{
 250        int order = get_order(size);
 251
 252        return __get_dma_pages(GFP_KERNEL, order);
 253}
 254
 255/* DMA data buffer, DMA command buffer */
 256static unsigned char *ltdmabuf;
 257static unsigned char *ltdmacbuf;
 258
 259/* private struct, holds our appletalk address */
 260
 261struct ltpc_private
 262{
 263	struct atalk_addr my_addr;
 264};
 265
 266/* transmit queue element struct */
 267
 268struct xmitQel {
 269	struct xmitQel *next;
 270	/* command buffer */
 271	unsigned char *cbuf;
 272	short cbuflen;
 273	/* data buffer */
 274	unsigned char *dbuf;
 275	short dbuflen;
 276	unsigned char QWrite;	/* read or write data */
 277	unsigned char mailbox;
 278};
 279
 280/* the transmit queue itself */
 281
 282static struct xmitQel *xmQhd, *xmQtl;
 283
 284static void enQ(struct xmitQel *qel)
 285{
 286	unsigned long flags;
 287	qel->next = NULL;
 288	
 289	spin_lock_irqsave(&txqueue_lock, flags);
 290	if (xmQtl) {
 291		xmQtl->next = qel;
 292	} else {
 293		xmQhd = qel;
 294	}
 295	xmQtl = qel;
 296	spin_unlock_irqrestore(&txqueue_lock, flags);
 297
 298	if (debug & DEBUG_LOWER)
 299		printk("enqueued a 0x%02x command\n",qel->cbuf[0]);
 300}
 301
 302static struct xmitQel *deQ(void)
 303{
 304	unsigned long flags;
 305	int i;
 306	struct xmitQel *qel=NULL;
 307	
 308	spin_lock_irqsave(&txqueue_lock, flags);
 309	if (xmQhd) {
 310		qel = xmQhd;
 311		xmQhd = qel->next;
 312		if(!xmQhd) xmQtl = NULL;
 313	}
 314	spin_unlock_irqrestore(&txqueue_lock, flags);
 315
 316	if ((debug & DEBUG_LOWER) && qel) {
 317		int n;
 318		printk(KERN_DEBUG "ltpc: dequeued command ");
 319		n = qel->cbuflen;
 320		if (n>100) n=100;
 321		for(i=0;i<n;i++) printk("%02x ",qel->cbuf[i]);
 322		printk("\n");
 323	}
 324
 325	return qel;
 326}
 327
 328/* and... the queue elements we'll be using */
 329static struct xmitQel qels[16];
 330
 331/* and their corresponding mailboxes */
 332static unsigned char mailbox[16];
 333static unsigned char mboxinuse[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
 334
 335static int wait_timeout(struct net_device *dev, int c)
 336{
 337	/* returns true if it stayed c */
 338	/* this uses base+6, but it's ok */
 339	int i;
 340
 341	/* twenty second or so total */
 342
 343	for(i=0;i<200000;i++) {
 344		if ( c != inb_p(dev->base_addr+6) ) return 0;
 345		udelay(100);
 346	}
 347	return 1; /* timed out */
 348}
 349
 350/* get the first free mailbox */
 351
 352static int getmbox(void)
 353{
 354	unsigned long flags;
 355	int i;
 356
 357	spin_lock_irqsave(&mbox_lock, flags);
 358	for(i=1;i<16;i++) if(!mboxinuse[i]) {
 359		mboxinuse[i]=1;
 360		spin_unlock_irqrestore(&mbox_lock, flags);
 361		return i;
 362	}
 363	spin_unlock_irqrestore(&mbox_lock, flags);
 364	return 0;
 365}
 366
 367/* read a command from the card */
 368static void handlefc(struct net_device *dev)
 369{
 370	/* called *only* from idle, non-reentrant */
 371	int dma = dev->dma;
 372	int base = dev->base_addr;
 373	unsigned long flags;
 374
 375
 376	flags=claim_dma_lock();
 377	disable_dma(dma);
 378	clear_dma_ff(dma);
 379	set_dma_mode(dma,DMA_MODE_READ);
 380	set_dma_addr(dma,virt_to_bus(ltdmacbuf));
 381	set_dma_count(dma,50);
 382	enable_dma(dma);
 383	release_dma_lock(flags);
 384
 385	inb_p(base+3);
 386	inb_p(base+2);
 387
 388	if ( wait_timeout(dev,0xfc) ) printk("timed out in handlefc\n");
 389}
 390
 391/* read data from the card */
 392static void handlefd(struct net_device *dev)
 393{
 394	int dma = dev->dma;
 395	int base = dev->base_addr;
 396	unsigned long flags;
 397
 398	flags=claim_dma_lock();
 399	disable_dma(dma);
 400	clear_dma_ff(dma);
 401	set_dma_mode(dma,DMA_MODE_READ);
 402	set_dma_addr(dma,virt_to_bus(ltdmabuf));
 403	set_dma_count(dma,800);
 404	enable_dma(dma);
 405	release_dma_lock(flags);
 406
 407	inb_p(base+3);
 408	inb_p(base+2);
 409
 410	if ( wait_timeout(dev,0xfd) ) printk("timed out in handlefd\n");
 411	sendup_buffer(dev);
 412} 
 413
 414static void handlewrite(struct net_device *dev)
 415{
 416	/* called *only* from idle, non-reentrant */
 417	/* on entry, 0xfb and ltdmabuf holds data */
 418	int dma = dev->dma;
 419	int base = dev->base_addr;
 420	unsigned long flags;
 421	
 422	flags=claim_dma_lock();
 423	disable_dma(dma);
 424	clear_dma_ff(dma);
 425	set_dma_mode(dma,DMA_MODE_WRITE);
 426	set_dma_addr(dma,virt_to_bus(ltdmabuf));
 427	set_dma_count(dma,800);
 428	enable_dma(dma);
 429	release_dma_lock(flags);
 430	
 431	inb_p(base+3);
 432	inb_p(base+2);
 433
 434	if ( wait_timeout(dev,0xfb) ) {
 435		flags=claim_dma_lock();
 436		printk("timed out in handlewrite, dma res %d\n",
 437			get_dma_residue(dev->dma) );
 438		release_dma_lock(flags);
 439	}
 440}
 441
 442static void handleread(struct net_device *dev)
 443{
 444	/* on entry, 0xfb */
 445	/* on exit, ltdmabuf holds data */
 446	int dma = dev->dma;
 447	int base = dev->base_addr;
 448	unsigned long flags;
 449
 450	
 451	flags=claim_dma_lock();
 452	disable_dma(dma);
 453	clear_dma_ff(dma);
 454	set_dma_mode(dma,DMA_MODE_READ);
 455	set_dma_addr(dma,virt_to_bus(ltdmabuf));
 456	set_dma_count(dma,800);
 457	enable_dma(dma);
 458	release_dma_lock(flags);
 459
 460	inb_p(base+3);
 461	inb_p(base+2);
 462	if ( wait_timeout(dev,0xfb) ) printk("timed out in handleread\n");
 463}
 464
 465static void handlecommand(struct net_device *dev)
 466{
 467	/* on entry, 0xfa and ltdmacbuf holds command */
 468	int dma = dev->dma;
 469	int base = dev->base_addr;
 470	unsigned long flags;
 471
 472	flags=claim_dma_lock();
 473	disable_dma(dma);
 474	clear_dma_ff(dma);
 475	set_dma_mode(dma,DMA_MODE_WRITE);
 476	set_dma_addr(dma,virt_to_bus(ltdmacbuf));
 477	set_dma_count(dma,50);
 478	enable_dma(dma);
 479	release_dma_lock(flags);
 480	inb_p(base+3);
 481	inb_p(base+2);
 482	if ( wait_timeout(dev,0xfa) ) printk("timed out in handlecommand\n");
 483} 
 484
 485/* ready made command for getting the result from the card */
 486static unsigned char rescbuf[2] = {LT_GETRESULT,0};
 487static unsigned char resdbuf[2];
 488
 489static int QInIdle;
 490
 491/* idle expects to be called with the IRQ line high -- either because of
 492 * an interrupt, or because the line is tri-stated
 493 */
 494
 495static void idle(struct net_device *dev)
 496{
 497	unsigned long flags;
 498	int state;
 499	/* FIXME This is initialized to shut the warning up, but I need to
 500	 * think this through again.
 501	 */
 502	struct xmitQel *q = NULL;
 503	int oops;
 504	int i;
 505	int base = dev->base_addr;
 506
 507	spin_lock_irqsave(&txqueue_lock, flags);
 508	if(QInIdle) {
 509		spin_unlock_irqrestore(&txqueue_lock, flags);
 510		return;
 511	}
 512	QInIdle = 1;
 513	spin_unlock_irqrestore(&txqueue_lock, flags);
 514
 515	/* this tri-states the IRQ line */
 516	(void) inb_p(base+6);
 517
 518	oops = 100;
 519
 520loop:
 521	if (0>oops--) { 
 522		printk("idle: looped too many times\n");
 523		goto done;
 524	}
 525
 526	state = inb_p(base+6);
 527	if (state != inb_p(base+6)) goto loop;
 528
 529	switch(state) {
 530		case 0xfc:
 531			/* incoming command */
 532			if (debug & DEBUG_LOWER) printk("idle: fc\n");
 533			handlefc(dev); 
 534			break;
 535		case 0xfd:
 536			/* incoming data */
 537			if(debug & DEBUG_LOWER) printk("idle: fd\n");
 538			handlefd(dev); 
 539			break;
 540		case 0xf9:
 541			/* result ready */
 542			if (debug & DEBUG_LOWER) printk("idle: f9\n");
 543			if(!mboxinuse[0]) {
 544				mboxinuse[0] = 1;
 545				qels[0].cbuf = rescbuf;
 546				qels[0].cbuflen = 2;
 547				qels[0].dbuf = resdbuf;
 548				qels[0].dbuflen = 2;
 549				qels[0].QWrite = 0;
 550				qels[0].mailbox = 0;
 551				enQ(&qels[0]);
 552			}
 553			inb_p(dev->base_addr+1);
 554			inb_p(dev->base_addr+0);
 555			if( wait_timeout(dev,0xf9) )
 556				printk("timed out idle f9\n");
 557			break;
 558		case 0xf8:
 559			/* ?? */
 560			if (xmQhd) {
 561				inb_p(dev->base_addr+1);
 562				inb_p(dev->base_addr+0);
 563				if(wait_timeout(dev,0xf8) )
 564					printk("timed out idle f8\n");
 565			} else {
 566				goto done;
 567			}
 568			break;
 569		case 0xfa:
 570			/* waiting for command */
 571			if(debug & DEBUG_LOWER) printk("idle: fa\n");
 572			if (xmQhd) {
 573				q=deQ();
 574				memcpy(ltdmacbuf,q->cbuf,q->cbuflen);
 575				ltdmacbuf[1] = q->mailbox;
 576				if (debug>1) { 
 577					int n;
 578					printk("ltpc: sent command     ");
 579					n = q->cbuflen;
 580					if (n>100) n=100;
 581					for(i=0;i<n;i++)
 582						printk("%02x ",ltdmacbuf[i]);
 583					printk("\n");
 584				}
 
 585				handlecommand(dev);
 586					if(0xfa==inb_p(base+6)) {
 587						/* we timed out, so return */
 588						goto done;
 589					} 
 
 590			} else {
 591				/* we don't seem to have a command */
 592				if (!mboxinuse[0]) {
 593					mboxinuse[0] = 1;
 594					qels[0].cbuf = rescbuf;
 595					qels[0].cbuflen = 2;
 596					qels[0].dbuf = resdbuf;
 597					qels[0].dbuflen = 2;
 598					qels[0].QWrite = 0;
 599					qels[0].mailbox = 0;
 600					enQ(&qels[0]);
 601				} else {
 602					printk("trouble: response command already queued\n");
 603					goto done;
 604				}
 605			} 
 606			break;
 607		case 0Xfb:
 608			/* data transfer ready */
 609			if(debug & DEBUG_LOWER) printk("idle: fb\n");
 610			if(q->QWrite) {
 611				memcpy(ltdmabuf,q->dbuf,q->dbuflen);
 612				handlewrite(dev);
 613			} else {
 614				handleread(dev);
 615				/* non-zero mailbox numbers are for
 616				   commmands, 0 is for GETRESULT
 617				   requests */
 618				if(q->mailbox) {
 619					memcpy(q->dbuf,ltdmabuf,q->dbuflen);
 620				} else { 
 621					/* this was a result */
 622					mailbox[ 0x0f & ltdmabuf[0] ] = ltdmabuf[1];
 623					mboxinuse[0]=0;
 624				}
 625			}
 626			break;
 627	}
 628	goto loop;
 629
 630done:
 631	QInIdle=0;
 632
 633	/* now set the interrupts back as appropriate */
 634	/* the first read takes it out of tri-state (but still high) */
 635	/* the second resets it */
 636	/* note that after this point, any read of base+6 will
 637	   trigger an interrupt */
 638
 639	if (dev->irq) {
 640		inb_p(base+7);
 641		inb_p(base+7);
 642	}
 643}
 644
 645
 646static int do_write(struct net_device *dev, void *cbuf, int cbuflen,
 647	void *dbuf, int dbuflen)
 648{
 649
 650	int i = getmbox();
 651	int ret;
 652
 653	if(i) {
 654		qels[i].cbuf = cbuf;
 655		qels[i].cbuflen = cbuflen;
 656		qels[i].dbuf = dbuf;
 657		qels[i].dbuflen = dbuflen;
 658		qels[i].QWrite = 1;
 659		qels[i].mailbox = i;  /* this should be initted rather */
 660		enQ(&qels[i]);
 661		idle(dev);
 662		ret = mailbox[i];
 663		mboxinuse[i]=0;
 664		return ret;
 665	}
 666	printk("ltpc: could not allocate mbox\n");
 667	return -1;
 668}
 669
 670static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
 671	void *dbuf, int dbuflen)
 672{
 673
 674	int i = getmbox();
 675	int ret;
 676
 677	if(i) {
 678		qels[i].cbuf = cbuf;
 679		qels[i].cbuflen = cbuflen;
 680		qels[i].dbuf = dbuf;
 681		qels[i].dbuflen = dbuflen;
 682		qels[i].QWrite = 0;
 683		qels[i].mailbox = i;  /* this should be initted rather */
 684		enQ(&qels[i]);
 685		idle(dev);
 686		ret = mailbox[i];
 687		mboxinuse[i]=0;
 688		return ret;
 689	}
 690	printk("ltpc: could not allocate mbox\n");
 691	return -1;
 692}
 693
 694/* end of idle handlers -- what should be seen is do_read, do_write */
 695
 696static struct timer_list ltpc_timer;
 697static struct net_device *ltpc_timer_dev;
 698
 699static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
 700
 701static int read_30 ( struct net_device *dev)
 702{
 703	lt_command c;
 704	c.getflags.command = LT_GETFLAGS;
 705	return do_read(dev, &c, sizeof(c.getflags),&c,0);
 706}
 707
 708static int set_30 (struct net_device *dev,int x)
 709{
 710	lt_command c;
 711	c.setflags.command = LT_SETFLAGS;
 712	c.setflags.flags = x;
 713	return do_write(dev, &c, sizeof(c.setflags),&c,0);
 714}
 715
 716/* LLAP to DDP translation */
 717
 718static int sendup_buffer (struct net_device *dev)
 719{
 720	/* on entry, command is in ltdmacbuf, data in ltdmabuf */
 721	/* called from idle, non-reentrant */
 722
 723	int dnode, snode, llaptype, len; 
 724	int sklen;
 725	struct sk_buff *skb;
 726	struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;
 727
 728	if (ltc->command != LT_RCVLAP) {
 729		printk("unknown command 0x%02x from ltpc card\n",ltc->command);
 730		return -1;
 731	}
 732	dnode = ltc->dnode;
 733	snode = ltc->snode;
 734	llaptype = ltc->laptype;
 735	len = ltc->length; 
 736
 737	sklen = len;
 738	if (llaptype == 1) 
 739		sklen += 8;  /* correct for short ddp */
 740	if(sklen > 800) {
 741		printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
 742			dev->name,sklen);
 743		return -1;
 744	}
 745
 746	if ( (llaptype==0) || (llaptype>2) ) {
 747		printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
 748		return -1;
 749	}
 750
 751
 752	skb = dev_alloc_skb(3+sklen);
 753	if (skb == NULL) 
 754	{
 755		printk("%s: dropping packet due to memory squeeze.\n",
 756			dev->name);
 757		return -1;
 758	}
 759	skb->dev = dev;
 760
 761	if (sklen > len)
 762		skb_reserve(skb,8);
 763	skb_put(skb,len+3);
 764	skb->protocol = htons(ETH_P_LOCALTALK);
 765	/* add LLAP header */
 766	skb->data[0] = dnode;
 767	skb->data[1] = snode;
 768	skb->data[2] = llaptype;
 769	skb_reset_mac_header(skb);	/* save pointer to llap header */
 770	skb_pull(skb,3);
 771
 772	/* copy ddp(s,e)hdr + contents */
 773	skb_copy_to_linear_data(skb, ltdmabuf, len);
 774
 775	skb_reset_transport_header(skb);
 776
 777	dev->stats.rx_packets++;
 778	dev->stats.rx_bytes += skb->len;
 779
 780	/* toss it onwards */
 781	netif_rx(skb);
 782	return 0;
 783}
 784
 785/* the handler for the board interrupt */
 786 
 787static irqreturn_t
 788ltpc_interrupt(int irq, void *dev_id)
 789{
 790	struct net_device *dev = dev_id;
 791
 792	if (dev==NULL) {
 793		printk("ltpc_interrupt: unknown device.\n");
 794		return IRQ_NONE;
 795	}
 796
 797	inb_p(dev->base_addr+6);  /* disable further interrupts from board */
 798
 799	idle(dev); /* handle whatever is coming in */
 800 
 801	/* idle re-enables interrupts from board */ 
 802
 803	return IRQ_HANDLED;
 804}
 805
 806/***
 807 *
 808 *    The ioctls that the driver responds to are:
 809 *
 810 *    SIOCSIFADDR -- do probe using the passed node hint.
 811 *    SIOCGIFADDR -- return net, node.
 812 *
 813 *    some of this stuff should be done elsewhere.
 814 *
 815 ***/
 816
 817static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 818{
 819	struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
 820	/* we'll keep the localtalk node address in dev->pa_addr */
 821	struct ltpc_private *ltpc_priv = netdev_priv(dev);
 822	struct atalk_addr *aa = &ltpc_priv->my_addr;
 823	struct lt_init c;
 824	int ltflags;
 825
 826	if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
 827
 828	switch(cmd) {
 829		case SIOCSIFADDR:
 830
 831			aa->s_net  = sa->sat_addr.s_net;
 832      
 833			/* this does the probe and returns the node addr */
 834			c.command = LT_INIT;
 835			c.hint = sa->sat_addr.s_node;
 836
 837			aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
 838
 839			/* get all llap frames raw */
 840			ltflags = read_30(dev);
 841			ltflags |= LT_FLAG_ALLLAP;
 842			set_30 (dev,ltflags);  
 843
 844			dev->broadcast[0] = 0xFF;
 845			dev->dev_addr[0] = aa->s_node;
 846
 847			dev->addr_len=1;
 848   
 849			return 0;
 850
 851		case SIOCGIFADDR:
 852
 853			sa->sat_addr.s_net = aa->s_net;
 854			sa->sat_addr.s_node = aa->s_node;
 855
 856			return 0;
 857
 858		default: 
 859			return -EINVAL;
 860	}
 861}
 862
 863static void set_multicast_list(struct net_device *dev)
 864{
 865	/* This needs to be present to keep netatalk happy. */
 866	/* Actually netatalk needs fixing! */
 867}
 868
 869static int ltpc_poll_counter;
 870
 871static void ltpc_poll(struct timer_list *unused)
 872{
 873	del_timer(&ltpc_timer);
 874
 875	if(debug & DEBUG_VERBOSE) {
 876		if (!ltpc_poll_counter) {
 877			ltpc_poll_counter = 50;
 878			printk("ltpc poll is alive\n");
 879		}
 880		ltpc_poll_counter--;
 881	}
 882
 883	/* poll 20 times per second */
 884	idle(ltpc_timer_dev);
 885	ltpc_timer.expires = jiffies + HZ/20;
 886	add_timer(&ltpc_timer);
 887}
 888
 889/* DDP to LLAP translation */
 890
 891static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
 892{
 893	/* in kernel 1.3.xx, on entry skb->data points to ddp header,
 894	 * and skb->len is the length of the ddp data + ddp header
 895	 */
 896	int i;
 897	struct lt_sendlap cbuf;
 898	unsigned char *hdr;
 899
 900	cbuf.command = LT_SENDLAP;
 901	cbuf.dnode = skb->data[0];
 902	cbuf.laptype = skb->data[2];
 903	skb_pull(skb,3);	/* skip past LLAP header */
 904	cbuf.length = skb->len;	/* this is host order */
 905	skb_reset_transport_header(skb);
 906
 907	if(debug & DEBUG_UPPER) {
 908		printk("command ");
 909		for(i=0;i<6;i++)
 910			printk("%02x ",((unsigned char *)&cbuf)[i]);
 911		printk("\n");
 912	}
 913
 914	hdr = skb_transport_header(skb);
 915	do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);
 916
 917	if(debug & DEBUG_UPPER) {
 918		printk("sent %d ddp bytes\n",skb->len);
 919		for (i = 0; i < skb->len; i++)
 920			printk("%02x ", hdr[i]);
 921		printk("\n");
 922	}
 923
 924	dev->stats.tx_packets++;
 925	dev->stats.tx_bytes += skb->len;
 926
 927	dev_kfree_skb(skb);
 928	return NETDEV_TX_OK;
 929}
 930
 931/* initialization stuff */
 932  
 933static int __init ltpc_probe_dma(int base, int dma)
 934{
 935	int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
 936  	unsigned long timeout;
 937  	unsigned long f;
 938  
 939  	if (want & 1) {
 940		if (request_dma(1,"ltpc")) {
 941			want &= ~1;
 942		} else {
 943			f=claim_dma_lock();
 944			disable_dma(1);
 945			clear_dma_ff(1);
 946			set_dma_mode(1,DMA_MODE_WRITE);
 947			set_dma_addr(1,virt_to_bus(ltdmabuf));
 948			set_dma_count(1,sizeof(struct lt_mem));
 949			enable_dma(1);
 950			release_dma_lock(f);
 951		}
 952	}
 953	if (want & 2) {
 954		if (request_dma(3,"ltpc")) {
 955			want &= ~2;
 956		} else {
 957			f=claim_dma_lock();
 958			disable_dma(3);
 959			clear_dma_ff(3);
 960			set_dma_mode(3,DMA_MODE_WRITE);
 961			set_dma_addr(3,virt_to_bus(ltdmabuf));
 962			set_dma_count(3,sizeof(struct lt_mem));
 963			enable_dma(3);
 964			release_dma_lock(f);
 965		}
 966	}
 967	/* set up request */
 968
 969	/* FIXME -- do timings better! */
 970
 971	ltdmabuf[0] = LT_READMEM;
 972	ltdmabuf[1] = 1;  /* mailbox */
 973	ltdmabuf[2] = 0; ltdmabuf[3] = 0;  /* address */
 974	ltdmabuf[4] = 0; ltdmabuf[5] = 1;  /* read 0x0100 bytes */
 975	ltdmabuf[6] = 0; /* dunno if this is necessary */
 976
 977	inb_p(io+1);
 978	inb_p(io+0);
 979	timeout = jiffies+100*HZ/100;
 980	while(time_before(jiffies, timeout)) {
 981		if ( 0xfa == inb_p(io+6) ) break;
 982	}
 983
 984	inb_p(io+3);
 985	inb_p(io+2);
 986	while(time_before(jiffies, timeout)) {
 987		if ( 0xfb == inb_p(io+6) ) break;
 988	}
 989
 990	/* release the other dma channel (if we opened both of them) */
 991
 992	if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
 993		want &= ~2;
 994		free_dma(3);
 995	}
 996
 997	if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
 998		want &= ~1;
 999		free_dma(1);
1000	}
1001
1002	if (!want)
1003		return 0;
1004
1005	return (want & 2) ? 3 : 1;
1006}
1007
1008static const struct net_device_ops ltpc_netdev = {
1009	.ndo_start_xmit		= ltpc_xmit,
1010	.ndo_do_ioctl		= ltpc_ioctl,
1011	.ndo_set_rx_mode	= set_multicast_list,
1012};
1013
1014struct net_device * __init ltpc_probe(void)
1015{
1016	struct net_device *dev;
1017	int err = -ENOMEM;
1018	int x=0,y=0;
1019	int autoirq;
1020	unsigned long f;
1021	unsigned long timeout;
1022
1023	dev = alloc_ltalkdev(sizeof(struct ltpc_private));
1024	if (!dev)
1025		goto out;
1026
1027	/* probe for the I/O port address */
1028	
1029	if (io != 0x240 && request_region(0x220,8,"ltpc")) {
1030		x = inb_p(0x220+6);
1031		if ( (x!=0xff) && (x>=0xf0) ) {
1032			io = 0x220;
1033			goto got_port;
1034		}
1035		release_region(0x220,8);
1036	}
1037	if (io != 0x220 && request_region(0x240,8,"ltpc")) {
1038		y = inb_p(0x240+6);
1039		if ( (y!=0xff) && (y>=0xf0) ){ 
1040			io = 0x240;
1041			goto got_port;
1042		}
1043		release_region(0x240,8);
1044	} 
1045
1046	/* give up in despair */
1047	printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
1048	err = -ENODEV;
1049	goto out1;
1050
1051 got_port:
1052	/* probe for the IRQ line */
1053	if (irq < 2) {
1054		unsigned long irq_mask;
1055
1056		irq_mask = probe_irq_on();
1057		/* reset the interrupt line */
1058		inb_p(io+7);
1059		inb_p(io+7);
1060		/* trigger an interrupt (I hope) */
1061		inb_p(io+6);
1062		mdelay(2);
1063		autoirq = probe_irq_off(irq_mask);
1064
1065		if (autoirq == 0) {
1066			printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
1067		} else {
1068			irq = autoirq;
1069		}
1070	}
1071
1072	/* allocate a DMA buffer */
1073	ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
1074	if (!ltdmabuf) {
1075		printk(KERN_ERR "ltpc: mem alloc failed\n");
1076		err = -ENOMEM;
1077		goto out2;
1078	}
1079
1080	ltdmacbuf = &ltdmabuf[800];
1081
1082	if(debug & DEBUG_VERBOSE) {
1083		printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
1084	}
1085
1086	/* reset the card */
1087
1088	inb_p(io+1);
1089	inb_p(io+3);
1090
1091	msleep(20);
1092
1093	inb_p(io+0);
1094	inb_p(io+2);
1095	inb_p(io+7); /* clear reset */
1096	inb_p(io+4); 
1097	inb_p(io+5);
1098	inb_p(io+5); /* enable dma */
1099	inb_p(io+6); /* tri-state interrupt line */
1100
1101	ssleep(1);
1102	
1103	/* now, figure out which dma channel we're using, unless it's
1104	   already been specified */
1105	/* well, 0 is a legal DMA channel, but the LTPC card doesn't
1106	   use it... */
1107	dma = ltpc_probe_dma(io, dma);
1108	if (!dma) {  /* no dma channel */
1109		printk(KERN_ERR "No DMA channel found on ltpc card.\n");
1110		err = -ENODEV;
1111		goto out3;
1112	}
1113
1114	/* print out friendly message */
1115	if(irq)
1116		printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
1117	else
1118		printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d.  Using polled mode.\n",io,dma);
1119
1120	dev->netdev_ops = &ltpc_netdev;
1121	dev->base_addr = io;
1122	dev->irq = irq;
1123	dev->dma = dma;
1124
1125	/* the card will want to send a result at this point */
1126	/* (I think... leaving out this part makes the kernel crash,
1127           so I put it back in...) */
1128
1129	f=claim_dma_lock();
1130	disable_dma(dma);
1131	clear_dma_ff(dma);
1132	set_dma_mode(dma,DMA_MODE_READ);
1133	set_dma_addr(dma,virt_to_bus(ltdmabuf));
1134	set_dma_count(dma,0x100);
1135	enable_dma(dma);
1136	release_dma_lock(f);
1137
1138	(void) inb_p(io+3);
1139	(void) inb_p(io+2);
1140	timeout = jiffies+100*HZ/100;
1141
1142	while(time_before(jiffies, timeout)) {
1143		if( 0xf9 == inb_p(io+6))
1144			break;
1145		schedule();
1146	}
1147
1148	if(debug & DEBUG_VERBOSE) {
1149		printk("setting up timer and irq\n");
1150	}
1151
1152	/* grab it and don't let go :-) */
1153	if (irq && request_irq( irq, ltpc_interrupt, 0, "ltpc", dev) >= 0)
1154	{
1155		(void) inb_p(io+7);  /* enable interrupts from board */
1156		(void) inb_p(io+7);  /* and reset irq line */
1157	} else {
1158		if( irq )
1159			printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
1160		dev->irq = 0;
1161		/* polled mode -- 20 times per second */
1162		/* this is really, really slow... should it poll more often? */
1163		ltpc_timer_dev = dev;
1164		timer_setup(&ltpc_timer, ltpc_poll, 0);
1165
1166		ltpc_timer.expires = jiffies + HZ/20;
1167		add_timer(&ltpc_timer);
1168	}
1169	err = register_netdev(dev);
1170	if (err)
1171		goto out4;
1172
1173	return NULL;
1174out4:
1175	del_timer_sync(&ltpc_timer);
1176	if (dev->irq)
1177		free_irq(dev->irq, dev);
1178out3:
1179	free_pages((unsigned long)ltdmabuf, get_order(1000));
1180out2:
1181	release_region(io, 8);
1182out1:
1183	free_netdev(dev);
1184out:
1185	return ERR_PTR(err);
1186}
1187
1188#ifndef MODULE
1189/* handles "ltpc=io,irq,dma" kernel command lines */
1190static int __init ltpc_setup(char *str)
1191{
1192	int ints[5];
1193
1194	str = get_options(str, ARRAY_SIZE(ints), ints);
1195
1196	if (ints[0] == 0) {
1197		if (str && !strncmp(str, "auto", 4)) {
1198			/* do nothing :-) */
1199		}
1200		else {
1201			/* usage message */
1202			printk (KERN_ERR
1203				"ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
1204			return 0;
1205		}
1206	} else {
1207		io = ints[1];
1208		if (ints[0] > 1) {
1209			irq = ints[2];
1210		}
1211		if (ints[0] > 2) {
1212			dma = ints[3];
1213		}
1214		/* ignore any other parameters */
1215	}
1216	return 1;
1217}
1218
1219__setup("ltpc=", ltpc_setup);
1220#endif /* MODULE */
1221
1222static struct net_device *dev_ltpc;
1223
1224#ifdef MODULE
1225
1226MODULE_LICENSE("GPL");
1227module_param(debug, int, 0);
1228module_param_hw(io, int, ioport, 0);
1229module_param_hw(irq, int, irq, 0);
1230module_param_hw(dma, int, dma, 0);
1231
1232
1233static int __init ltpc_module_init(void)
1234{
1235        if(io == 0)
1236		printk(KERN_NOTICE
1237		       "ltpc: Autoprobing is not recommended for modules\n");
1238
1239	dev_ltpc = ltpc_probe();
1240	return PTR_ERR_OR_ZERO(dev_ltpc);
1241}
1242module_init(ltpc_module_init);
1243#endif
1244
1245static 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(&ltpc_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
1277module_exit(ltpc_cleanup);