drivers/net/appletalk/ltpc.c

   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 <asm/dma.h>
 233 #include <asm/io.h>
 234
 235 /* our stuff */
 236 #include "ltpc.h"
 237
 238 static DEFINE_SPINLOCK(txqueue_lock);
 239 static DEFINE_SPINLOCK(mbox_lock);
 240
 241 /* function prototypes */
 242 static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
 243         void *dbuf, int dbuflen);
 244 static int sendup_buffer (struct net_device *dev);
 245
 246 /* Dma Memory related stuff, cribbed directly from 3c505.c */
 247
 248 static 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 */
 256 static unsigned char *ltdmabuf;
 257 static unsigned char *ltdmacbuf;
 258
 259 /* private struct, holds our appletalk address */
 260
 261 struct ltpc_private
 262 {
 263         struct atalk_addr my_addr;
 264 };
 265
 266 /* transmit queue element struct */
 267
 268 struct 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
 282 static struct xmitQel *xmQhd, *xmQtl;
 283
 284 static 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
 302 static 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 */
 329 static struct xmitQel qels[16];
 330
 331 /* and their corresponding mailboxes */
 332 static unsigned char mailbox[16];
 333 static unsigned char mboxinuse[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
 334
 335 static 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
 352 static 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 */
 368 static 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 */
 392 static 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
 414 static 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
 442 static 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
 465 static 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 */
 486 static unsigned char rescbuf[2] = {LT_GETRESULT,0};
 487 static unsigned char resdbuf[2];
 488
 489 static 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
 495 static 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
 520 loop:
 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
 630 done:
 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
 646 static 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
 670 static 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
 696 static struct timer_list ltpc_timer;
 697
 698 static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
 699
 700 static int read_30 ( struct net_device *dev)
 701 {
 702         lt_command c;
 703         c.getflags.command = LT_GETFLAGS;
 704         return do_read(dev, &c, sizeof(c.getflags),&c,0);
 705 }
 706
 707 static int set_30 (struct net_device *dev,int x)
 708 {
 709         lt_command c;
 710         c.setflags.command = LT_SETFLAGS;
 711         c.setflags.flags = x;
 712         return do_write(dev, &c, sizeof(c.setflags),&c,0);
 713 }
 714
 715 /* LLAP to DDP translation */
 716
 717 static int sendup_buffer (struct net_device *dev)
 718 {
 719         /* on entry, command is in ltdmacbuf, data in ltdmabuf */
 720         /* called from idle, non-reentrant */
 721
 722         int dnode, snode, llaptype, len;
 723         int sklen;
 724         struct sk_buff *skb;
 725         struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;
 726
 727         if (ltc->command != LT_RCVLAP) {
 728                 printk("unknown command 0x%02x from ltpc card\n",ltc->command);
 729                 return -1;
 730         }
 731         dnode = ltc->dnode;
 732         snode = ltc->snode;
 733         llaptype = ltc->laptype;
 734         len = ltc->length;
 735
 736         sklen = len;
 737         if (llaptype == 1)
 738                 sklen += 8;  /* correct for short ddp */
 739         if(sklen > 800) {
 740                 printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
 741                         dev->name,sklen);
 742                 return -1;
 743         }
 744
 745         if ( (llaptype==0) || (llaptype>2) ) {
 746                 printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
 747                 return -1;
 748         }
 749
 750
 751         skb = dev_alloc_skb(3+sklen);
 752         if (skb == NULL)
 753         {
 754                 printk("%s: dropping packet due to memory squeeze.\n",
 755                         dev->name);
 756                 return -1;
 757         }
 758         skb->dev = dev;
 759
 760         if (sklen > len)
 761                 skb_reserve(skb,8);
 762         skb_put(skb,len+3);
 763         skb->protocol = htons(ETH_P_LOCALTALK);
 764         /* add LLAP header */
 765         skb->data[0] = dnode;
 766         skb->data[1] = snode;
 767         skb->data[2] = llaptype;
 768         skb_reset_mac_header(skb);      /* save pointer to llap header */
 769         skb_pull(skb,3);
 770
 771         /* copy ddp(s,e)hdr + contents */
 772         skb_copy_to_linear_data(skb, ltdmabuf, len);
 773
 774         skb_reset_transport_header(skb);
 775
 776         dev->stats.rx_packets++;
 777         dev->stats.rx_bytes += skb->len;
 778
 779         /* toss it onwards */
 780         netif_rx(skb);
 781         return 0;
 782 }
 783
 784 /* the handler for the board interrupt */
 785
 786 static irqreturn_t
 787 ltpc_interrupt(int irq, void *dev_id)
 788 {
 789         struct net_device *dev = dev_id;
 790
 791         if (dev==NULL) {
 792                 printk("ltpc_interrupt: unknown device.\n");
 793                 return IRQ_NONE;
 794         }
 795
 796         inb_p(dev->base_addr+6);  /* disable further interrupts from board */
 797
 798         idle(dev); /* handle whatever is coming in */
 799
 800         /* idle re-enables interrupts from board */
 801
 802         return IRQ_HANDLED;
 803 }
 804
 805 /***
 806  *
 807  *    The ioctls that the driver responds to are:
 808  *
 809  *    SIOCSIFADDR -- do probe using the passed node hint.
 810  *    SIOCGIFADDR -- return net, node.
 811  *
 812  *    some of this stuff should be done elsewhere.
 813  *
 814  ***/
 815
 816 static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 817 {
 818         struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
 819         /* we'll keep the localtalk node address in dev->pa_addr */
 820         struct ltpc_private *ltpc_priv = netdev_priv(dev);
 821         struct atalk_addr *aa = &ltpc_priv->my_addr;
 822         struct lt_init c;
 823         int ltflags;
 824
 825         if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
 826
 827         switch(cmd) {
 828                 case SIOCSIFADDR:
 829
 830                         aa->s_net  = sa->sat_addr.s_net;
 831
 832                         /* this does the probe and returns the node addr */
 833                         c.command = LT_INIT;
 834                         c.hint = sa->sat_addr.s_node;
 835
 836                         aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
 837
 838                         /* get all llap frames raw */
 839                         ltflags = read_30(dev);
 840                         ltflags |= LT_FLAG_ALLLAP;
 841                         set_30 (dev,ltflags);
 842
 843                         dev->broadcast[0] = 0xFF;
 844                         dev->dev_addr[0] = aa->s_node;
 845
 846                         dev->addr_len=1;
 847
 848                         return 0;
 849
 850                 case SIOCGIFADDR:
 851
 852                         sa->sat_addr.s_net = aa->s_net;
 853                         sa->sat_addr.s_node = aa->s_node;
 854
 855                         return 0;
 856
 857                 default:
 858                         return -EINVAL;
 859         }
 860 }
 861
 862 static void set_multicast_list(struct net_device *dev)
 863 {
 864         /* This needs to be present to keep netatalk happy. */
 865         /* Actually netatalk needs fixing! */
 866 }
 867
 868 static int ltpc_poll_counter;
 869
 870 static void ltpc_poll(unsigned long l)
 871 {
 872         struct net_device *dev = (struct net_device *) l;
 873
 874         del_timer(&ltpc_timer);
 875
 876         if(debug & DEBUG_VERBOSE) {
 877                 if (!ltpc_poll_counter) {
 878                         ltpc_poll_counter = 50;
 879                         printk("ltpc poll is alive\n");
 880                 }
 881                 ltpc_poll_counter--;
 882         }
 883
 884         if (!dev)
 885                 return;  /* we've been downed */
 886
 887         /* poll 20 times per second */
 888         idle(dev);
 889         ltpc_timer.expires = jiffies + HZ/20;
 890
 891         add_timer(&ltpc_timer);
 892 }
 893
 894 /* DDP to LLAP translation */
 895
 896 static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
 897 {
 898         /* in kernel 1.3.xx, on entry skb->data points to ddp header,
 899          * and skb->len is the length of the ddp data + ddp header
 900          */
 901         int i;
 902         struct lt_sendlap cbuf;
 903         unsigned char *hdr;
 904
 905         cbuf.command = LT_SENDLAP;
 906         cbuf.dnode = skb->data[0];
 907         cbuf.laptype = skb->data[2];
 908         skb_pull(skb,3);        /* skip past LLAP header */
 909         cbuf.length = skb->len; /* this is host order */
 910         skb_reset_transport_header(skb);
 911
 912         if(debug & DEBUG_UPPER) {
 913                 printk("command ");
 914                 for(i=0;i<6;i++)
 915                         printk("%02x ",((unsigned char *)&cbuf)[i]);
 916                 printk("\n");
 917         }
 918
 919         hdr = skb_transport_header(skb);
 920         do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);
 921
 922         if(debug & DEBUG_UPPER) {
 923                 printk("sent %d ddp bytes\n",skb->len);
 924                 for (i = 0; i < skb->len; i++)
 925                         printk("%02x ", hdr[i]);
 926                 printk("\n");
 927         }
 928
 929         dev->stats.tx_packets++;
 930         dev->stats.tx_bytes += skb->len;
 931
 932         dev_kfree_skb(skb);
 933         return NETDEV_TX_OK;
 934 }
 935
 936 /* initialization stuff */
 937
 938 static int __init ltpc_probe_dma(int base, int dma)
 939 {
 940         int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
 941         unsigned long timeout;
 942         unsigned long f;
 943
 944         if (want & 1) {
 945                 if (request_dma(1,"ltpc")) {
 946                         want &= ~1;
 947                 } else {
 948                         f=claim_dma_lock();
 949                         disable_dma(1);
 950                         clear_dma_ff(1);
 951                         set_dma_mode(1,DMA_MODE_WRITE);
 952                         set_dma_addr(1,virt_to_bus(ltdmabuf));
 953                         set_dma_count(1,sizeof(struct lt_mem));
 954                         enable_dma(1);
 955                         release_dma_lock(f);
 956                 }
 957         }
 958         if (want & 2) {
 959                 if (request_dma(3,"ltpc")) {
 960                         want &= ~2;
 961                 } else {
 962                         f=claim_dma_lock();
 963                         disable_dma(3);
 964                         clear_dma_ff(3);
 965                         set_dma_mode(3,DMA_MODE_WRITE);
 966                         set_dma_addr(3,virt_to_bus(ltdmabuf));
 967                         set_dma_count(3,sizeof(struct lt_mem));
 968                         enable_dma(3);
 969                         release_dma_lock(f);
 970                 }
 971         }
 972         /* set up request */
 973
 974         /* FIXME -- do timings better! */
 975
 976         ltdmabuf[0] = LT_READMEM;
 977         ltdmabuf[1] = 1;  /* mailbox */
 978         ltdmabuf[2] = 0; ltdmabuf[3] = 0;  /* address */
 979         ltdmabuf[4] = 0; ltdmabuf[5] = 1;  /* read 0x0100 bytes */
 980         ltdmabuf[6] = 0; /* dunno if this is necessary */
 981
 982         inb_p(io+1);
 983         inb_p(io+0);
 984         timeout = jiffies+100*HZ/100;
 985         while(time_before(jiffies, timeout)) {
 986                 if ( 0xfa == inb_p(io+6) ) break;
 987         }
 988
 989         inb_p(io+3);
 990         inb_p(io+2);
 991         while(time_before(jiffies, timeout)) {
 992                 if ( 0xfb == inb_p(io+6) ) break;
 993         }
 994
 995         /* release the other dma channel (if we opened both of them) */
 996
 997         if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
 998                 want &= ~2;
 999                 free_dma(3);
1000         }
1001
1002         if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
1003                 want &= ~1;
1004                 free_dma(1);
1005         }
1006
1007         if (!want)
1008                 return 0;
1009
1010         return (want & 2) ? 3 : 1;
1011 }
1012
1013 static const struct net_device_ops ltpc_netdev = {
1014         .ndo_start_xmit         = ltpc_xmit,
1015         .ndo_do_ioctl           = ltpc_ioctl,
1016         .ndo_set_rx_mode        = set_multicast_list,
1017 };
1018
1019 struct net_device * __init ltpc_probe(void)
1020 {
1021         struct net_device *dev;
1022         int err = -ENOMEM;
1023         int x=0,y=0;
1024         int autoirq;
1025         unsigned long f;
1026         unsigned long timeout;
1027
1028         dev = alloc_ltalkdev(sizeof(struct ltpc_private));
1029         if (!dev)
1030                 goto out;
1031
1032         /* probe for the I/O port address */
1033
1034         if (io != 0x240 && request_region(0x220,8,"ltpc")) {
1035                 x = inb_p(0x220+6);
1036                 if ( (x!=0xff) && (x>=0xf0) ) {
1037                         io = 0x220;
1038                         goto got_port;
1039                 }
1040                 release_region(0x220,8);
1041         }
1042         if (io != 0x220 && request_region(0x240,8,"ltpc")) {
1043                 y = inb_p(0x240+6);
1044                 if ( (y!=0xff) && (y>=0xf0) ){
1045                         io = 0x240;
1046                         goto got_port;
1047                 }
1048                 release_region(0x240,8);
1049         }
1050
1051         /* give up in despair */
1052         printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
1053         err = -ENODEV;
1054         goto out1;
1055
1056  got_port:
1057         /* probe for the IRQ line */
1058         if (irq < 2) {
1059                 unsigned long irq_mask;
1060
1061                 irq_mask = probe_irq_on();
1062                 /* reset the interrupt line */
1063                 inb_p(io+7);
1064                 inb_p(io+7);
1065                 /* trigger an interrupt (I hope) */
1066                 inb_p(io+6);
1067                 mdelay(2);
1068                 autoirq = probe_irq_off(irq_mask);
1069
1070                 if (autoirq == 0) {
1071                         printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
1072                 } else {
1073                         irq = autoirq;
1074                 }
1075         }
1076
1077         /* allocate a DMA buffer */
1078         ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
1079         if (!ltdmabuf) {
1080                 printk(KERN_ERR "ltpc: mem alloc failed\n");
1081                 err = -ENOMEM;
1082                 goto out2;
1083         }
1084
1085         ltdmacbuf = &ltdmabuf[800];
1086
1087         if(debug & DEBUG_VERBOSE) {
1088                 printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
1089         }
1090
1091         /* reset the card */
1092
1093         inb_p(io+1);
1094         inb_p(io+3);
1095
1096         msleep(20);
1097
1098         inb_p(io+0);
1099         inb_p(io+2);
1100         inb_p(io+7); /* clear reset */
1101         inb_p(io+4);
1102         inb_p(io+5);
1103         inb_p(io+5); /* enable dma */
1104         inb_p(io+6); /* tri-state interrupt line */
1105
1106         ssleep(1);
1107
1108         /* now, figure out which dma channel we're using, unless it's
1109            already been specified */
1110         /* well, 0 is a legal DMA channel, but the LTPC card doesn't
1111            use it... */
1112         dma = ltpc_probe_dma(io, dma);
1113         if (!dma) {  /* no dma channel */
1114                 printk(KERN_ERR "No DMA channel found on ltpc card.\n");
1115                 err = -ENODEV;
1116                 goto out3;
1117         }
1118
1119         /* print out friendly message */
1120         if(irq)
1121                 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
1122         else
1123                 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d.  Using polled mode.\n",io,dma);
1124
1125         dev->netdev_ops = &ltpc_netdev;
1126         dev->base_addr = io;
1127         dev->irq = irq;
1128         dev->dma = dma;
1129
1130         /* the card will want to send a result at this point */
1131         /* (I think... leaving out this part makes the kernel crash,
1132            so I put it back in...) */
1133
1134         f=claim_dma_lock();
1135         disable_dma(dma);
1136         clear_dma_ff(dma);
1137         set_dma_mode(dma,DMA_MODE_READ);
1138         set_dma_addr(dma,virt_to_bus(ltdmabuf));
1139         set_dma_count(dma,0x100);
1140         enable_dma(dma);
1141         release_dma_lock(f);
1142
1143         (void) inb_p(io+3);
1144         (void) inb_p(io+2);
1145         timeout = jiffies+100*HZ/100;
1146
1147         while(time_before(jiffies, timeout)) {
1148                 if( 0xf9 == inb_p(io+6))
1149                         break;
1150                 schedule();
1151         }
1152
1153         if(debug & DEBUG_VERBOSE) {
1154                 printk("setting up timer and irq\n");
1155         }
1156
1157         /* grab it and don't let go :-) */
1158         if (irq && request_irq( irq, ltpc_interrupt, 0, "ltpc", dev) >= 0)
1159         {
1160                 (void) inb_p(io+7);  /* enable interrupts from board */
1161                 (void) inb_p(io+7);  /* and reset irq line */
1162         } else {
1163                 if( irq )
1164                         printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
1165                 dev->irq = 0;
1166                 /* polled mode -- 20 times per second */
1167                 /* this is really, really slow... should it poll more often? */
1168                 init_timer(&ltpc_timer);
1169                 ltpc_timer.function=ltpc_poll;
1170                 ltpc_timer.data = (unsigned long) dev;
1171
1172                 ltpc_timer.expires = jiffies + HZ/20;
1173                 add_timer(&ltpc_timer);
1174         }
1175         err = register_netdev(dev);
1176         if (err)
1177                 goto out4;
1178
1179         return NULL;
1180 out4:
1181         del_timer_sync(&ltpc_timer);
1182         if (dev->irq)
1183                 free_irq(dev->irq, dev);
1184 out3:
1185         free_pages((unsigned long)ltdmabuf, get_order(1000));
1186 out2:
1187         release_region(io, 8);
1188 out1:
1189         free_netdev(dev);
1190 out:
1191         return ERR_PTR(err);
1192 }
1193
1194 #ifndef MODULE
1195 /* handles "ltpc=io,irq,dma" kernel command lines */
1196 static int __init ltpc_setup(char *str)
1197 {
1198         int ints[5];
1199
1200         str = get_options(str, ARRAY_SIZE(ints), ints);
1201
1202         if (ints[0] == 0) {
1203                 if (str && !strncmp(str, "auto", 4)) {
1204                         /* do nothing :-) */
1205                 }
1206                 else {
1207                         /* usage message */
1208                         printk (KERN_ERR
1209                                 "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
1210                         return 0;
1211                 }
1212         } else {
1213                 io = ints[1];
1214                 if (ints[0] > 1) {
1215                         irq = ints[2];
1216                 }
1217                 if (ints[0] > 2) {
1218                         dma = ints[3];
1219                 }
1220                 /* ignore any other parameters */
1221         }
1222         return 1;
1223 }
1224
1225 __setup("ltpc=", ltpc_setup);
1226 #endif /* MODULE */
1227
1228 static struct net_device *dev_ltpc;
1229
1230 #ifdef MODULE
1231
1232 MODULE_LICENSE("GPL");
1233 module_param(debug, int, 0);
1234 module_param(io, int, 0);
1235 module_param(irq, int, 0);
1236 module_param(dma, int, 0);
1237
1238
1239 static int __init ltpc_module_init(void)
1240 {
1241         if(io == 0)
1242                 printk(KERN_NOTICE
1243                        "ltpc: Autoprobing is not recommended for modules\n");
1244
1245         dev_ltpc = ltpc_probe();
1246         return PTR_ERR_OR_ZERO(dev_ltpc);
1247 }
1248 module_init(ltpc_module_init);
1249 #endif
1250
1251 static void __exit ltpc_cleanup(void)
1252 {
1253
1254         if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
1255         unregister_netdev(dev_ltpc);
1256
1257         ltpc_timer.data = 0;  /* signal the poll routine that we're done */
1258
1259         del_timer_sync(&ltpc_timer);
1260
1261         if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
1262
1263         if (dev_ltpc->irq)
1264                 free_irq(dev_ltpc->irq, dev_ltpc);
1265
1266         if(debug & DEBUG_VERBOSE) printk("freeing dma\n");
1267
1268         if (dev_ltpc->dma)
1269                 free_dma(dev_ltpc->dma);
1270
1271         if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");
1272
1273         if (dev_ltpc->base_addr)
1274                 release_region(dev_ltpc->base_addr,8);
1275
1276         free_netdev(dev_ltpc);
1277
1278         if(debug & DEBUG_VERBOSE) printk("free_pages\n");
1279
1280         free_pages( (unsigned long) ltdmabuf, get_order(1000));
1281
1282         if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
1283 }
1284
1285 module_exit(ltpc_cleanup);