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1da177e4 LT |
1 | /* $Id: plip.c,v 1.3.6.2 1997/04/16 15:07:56 phil Exp $ */ |
2 | /* PLIP: A parallel port "network" driver for Linux. */ | |
3 | /* This driver is for parallel port with 5-bit cable (LapLink (R) cable). */ | |
4 | /* | |
5 | * Authors: Donald Becker <becker@scyld.com> | |
6 | * Tommy Thorn <thorn@daimi.aau.dk> | |
7 | * Tanabe Hiroyasu <hiro@sanpo.t.u-tokyo.ac.jp> | |
8 | * Alan Cox <gw4pts@gw4pts.ampr.org> | |
9 | * Peter Bauer <100136.3530@compuserve.com> | |
10 | * Niibe Yutaka <gniibe@mri.co.jp> | |
11 | * Nimrod Zimerman <zimerman@mailandnews.com> | |
12 | * | |
13 | * Enhancements: | |
14 | * Modularization and ifreq/ifmap support by Alan Cox. | |
15 | * Rewritten by Niibe Yutaka. | |
16 | * parport-sharing awareness code by Philip Blundell. | |
17 | * SMP locking by Niibe Yutaka. | |
18 | * Support for parallel ports with no IRQ (poll mode), | |
19 | * Modifications to use the parallel port API | |
20 | * by Nimrod Zimerman. | |
21 | * | |
22 | * Fixes: | |
23 | * Niibe Yutaka | |
24 | * - Module initialization. | |
25 | * - MTU fix. | |
26 | * - Make sure other end is OK, before sending a packet. | |
27 | * - Fix immediate timer problem. | |
28 | * | |
29 | * Al Viro | |
30 | * - Changed {enable,disable}_irq handling to make it work | |
31 | * with new ("stack") semantics. | |
32 | * | |
33 | * This program is free software; you can redistribute it and/or | |
34 | * modify it under the terms of the GNU General Public License | |
35 | * as published by the Free Software Foundation; either version | |
36 | * 2 of the License, or (at your option) any later version. | |
37 | */ | |
38 | ||
39 | /* | |
40 | * Original version and the name 'PLIP' from Donald Becker <becker@scyld.com> | |
41 | * inspired by Russ Nelson's parallel port packet driver. | |
42 | * | |
43 | * NOTE: | |
44 | * Tanabe Hiroyasu had changed the protocol, and it was in Linux v1.0. | |
45 | * Because of the necessity to communicate to DOS machines with the | |
46 | * Crynwr packet driver, Peter Bauer changed the protocol again | |
47 | * back to original protocol. | |
48 | * | |
49 | * This version follows original PLIP protocol. | |
50 | * So, this PLIP can't communicate the PLIP of Linux v1.0. | |
51 | */ | |
52 | ||
53 | /* | |
54 | * To use with DOS box, please do (Turn on ARP switch): | |
55 | * # ifconfig plip[0-2] arp | |
56 | */ | |
57 | static const char version[] = "NET3 PLIP version 2.4-parport gniibe@mri.co.jp\n"; | |
58 | ||
59 | /* | |
60 | Sources: | |
61 | Ideas and protocols came from Russ Nelson's <nelson@crynwr.com> | |
62 | "parallel.asm" parallel port packet driver. | |
63 | ||
64 | The "Crynwr" parallel port standard specifies the following protocol: | |
65 | Trigger by sending nibble '0x8' (this causes interrupt on other end) | |
66 | count-low octet | |
67 | count-high octet | |
68 | ... data octets | |
69 | checksum octet | |
70 | Each octet is sent as <wait for rx. '0x1?'> <send 0x10+(octet&0x0F)> | |
71 | <wait for rx. '0x0?'> <send 0x00+((octet>>4)&0x0F)> | |
72 | ||
73 | The packet is encapsulated as if it were ethernet. | |
74 | ||
75 | The cable used is a de facto standard parallel null cable -- sold as | |
76 | a "LapLink" cable by various places. You'll need a 12-conductor cable to | |
77 | make one yourself. The wiring is: | |
78 | SLCTIN 17 - 17 | |
79 | GROUND 25 - 25 | |
80 | D0->ERROR 2 - 15 15 - 2 | |
81 | D1->SLCT 3 - 13 13 - 3 | |
82 | D2->PAPOUT 4 - 12 12 - 4 | |
83 | D3->ACK 5 - 10 10 - 5 | |
84 | D4->BUSY 6 - 11 11 - 6 | |
85 | Do not connect the other pins. They are | |
86 | D5,D6,D7 are 7,8,9 | |
87 | STROBE is 1, FEED is 14, INIT is 16 | |
88 | extra grounds are 18,19,20,21,22,23,24 | |
89 | */ | |
90 | ||
91 | #include <linux/module.h> | |
92 | #include <linux/kernel.h> | |
93 | #include <linux/types.h> | |
94 | #include <linux/fcntl.h> | |
95 | #include <linux/interrupt.h> | |
96 | #include <linux/string.h> | |
97 | #include <linux/if_ether.h> | |
98 | #include <linux/in.h> | |
99 | #include <linux/errno.h> | |
100 | #include <linux/delay.h> | |
101 | #include <linux/lp.h> | |
102 | #include <linux/init.h> | |
103 | #include <linux/netdevice.h> | |
104 | #include <linux/etherdevice.h> | |
105 | #include <linux/inetdevice.h> | |
106 | #include <linux/skbuff.h> | |
107 | #include <linux/if_plip.h> | |
108 | #include <linux/workqueue.h> | |
109 | #include <linux/ioport.h> | |
110 | #include <linux/spinlock.h> | |
111 | #include <linux/parport.h> | |
112 | #include <linux/bitops.h> | |
113 | ||
114 | #include <net/neighbour.h> | |
115 | ||
116 | #include <asm/system.h> | |
117 | #include <asm/irq.h> | |
118 | #include <asm/byteorder.h> | |
119 | #include <asm/semaphore.h> | |
120 | ||
121 | /* Maximum number of devices to support. */ | |
122 | #define PLIP_MAX 8 | |
123 | ||
124 | /* Use 0 for production, 1 for verification, >2 for debug */ | |
125 | #ifndef NET_DEBUG | |
126 | #define NET_DEBUG 1 | |
127 | #endif | |
128 | static unsigned int net_debug = NET_DEBUG; | |
129 | ||
130 | #define ENABLE(irq) if (irq != -1) enable_irq(irq) | |
131 | #define DISABLE(irq) if (irq != -1) disable_irq(irq) | |
132 | ||
133 | /* In micro second */ | |
134 | #define PLIP_DELAY_UNIT 1 | |
135 | ||
136 | /* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */ | |
137 | #define PLIP_TRIGGER_WAIT 500 | |
138 | ||
139 | /* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */ | |
140 | #define PLIP_NIBBLE_WAIT 3000 | |
141 | ||
142 | /* Bottom halves */ | |
143 | static void plip_kick_bh(struct net_device *dev); | |
144 | static void plip_bh(struct net_device *dev); | |
145 | static void plip_timer_bh(struct net_device *dev); | |
146 | ||
147 | /* Interrupt handler */ | |
148 | static void plip_interrupt(int irq, void *dev_id, struct pt_regs *regs); | |
149 | ||
150 | /* Functions for DEV methods */ | |
151 | static int plip_tx_packet(struct sk_buff *skb, struct net_device *dev); | |
152 | static int plip_hard_header(struct sk_buff *skb, struct net_device *dev, | |
153 | unsigned short type, void *daddr, | |
154 | void *saddr, unsigned len); | |
155 | static int plip_hard_header_cache(struct neighbour *neigh, | |
156 | struct hh_cache *hh); | |
157 | static int plip_open(struct net_device *dev); | |
158 | static int plip_close(struct net_device *dev); | |
159 | static struct net_device_stats *plip_get_stats(struct net_device *dev); | |
160 | static int plip_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); | |
161 | static int plip_preempt(void *handle); | |
162 | static void plip_wakeup(void *handle); | |
163 | \f | |
164 | enum plip_connection_state { | |
165 | PLIP_CN_NONE=0, | |
166 | PLIP_CN_RECEIVE, | |
167 | PLIP_CN_SEND, | |
168 | PLIP_CN_CLOSING, | |
169 | PLIP_CN_ERROR | |
170 | }; | |
171 | ||
172 | enum plip_packet_state { | |
173 | PLIP_PK_DONE=0, | |
174 | PLIP_PK_TRIGGER, | |
175 | PLIP_PK_LENGTH_LSB, | |
176 | PLIP_PK_LENGTH_MSB, | |
177 | PLIP_PK_DATA, | |
178 | PLIP_PK_CHECKSUM | |
179 | }; | |
180 | ||
181 | enum plip_nibble_state { | |
182 | PLIP_NB_BEGIN, | |
183 | PLIP_NB_1, | |
184 | PLIP_NB_2, | |
185 | }; | |
186 | ||
187 | struct plip_local { | |
188 | enum plip_packet_state state; | |
189 | enum plip_nibble_state nibble; | |
190 | union { | |
191 | struct { | |
192 | #if defined(__LITTLE_ENDIAN) | |
193 | unsigned char lsb; | |
194 | unsigned char msb; | |
195 | #elif defined(__BIG_ENDIAN) | |
196 | unsigned char msb; | |
197 | unsigned char lsb; | |
198 | #else | |
199 | #error "Please fix the endianness defines in <asm/byteorder.h>" | |
200 | #endif | |
201 | } b; | |
202 | unsigned short h; | |
203 | } length; | |
204 | unsigned short byte; | |
205 | unsigned char checksum; | |
206 | unsigned char data; | |
207 | struct sk_buff *skb; | |
208 | }; | |
209 | ||
210 | struct net_local { | |
211 | struct net_device_stats enet_stats; | |
212 | struct work_struct immediate; | |
213 | struct work_struct deferred; | |
214 | struct work_struct timer; | |
215 | struct plip_local snd_data; | |
216 | struct plip_local rcv_data; | |
217 | struct pardevice *pardev; | |
218 | unsigned long trigger; | |
219 | unsigned long nibble; | |
220 | enum plip_connection_state connection; | |
221 | unsigned short timeout_count; | |
222 | int is_deferred; | |
223 | int port_owner; | |
224 | int should_relinquish; | |
225 | int (*orig_hard_header)(struct sk_buff *skb, struct net_device *dev, | |
226 | unsigned short type, void *daddr, | |
227 | void *saddr, unsigned len); | |
228 | int (*orig_hard_header_cache)(struct neighbour *neigh, | |
229 | struct hh_cache *hh); | |
230 | spinlock_t lock; | |
231 | atomic_t kill_timer; | |
232 | struct semaphore killed_timer_sem; | |
233 | }; | |
234 | \f | |
235 | inline static void enable_parport_interrupts (struct net_device *dev) | |
236 | { | |
237 | if (dev->irq != -1) | |
238 | { | |
239 | struct parport *port = | |
240 | ((struct net_local *)dev->priv)->pardev->port; | |
241 | port->ops->enable_irq (port); | |
242 | } | |
243 | } | |
244 | ||
245 | inline static void disable_parport_interrupts (struct net_device *dev) | |
246 | { | |
247 | if (dev->irq != -1) | |
248 | { | |
249 | struct parport *port = | |
250 | ((struct net_local *)dev->priv)->pardev->port; | |
251 | port->ops->disable_irq (port); | |
252 | } | |
253 | } | |
254 | ||
255 | inline static void write_data (struct net_device *dev, unsigned char data) | |
256 | { | |
257 | struct parport *port = | |
258 | ((struct net_local *)dev->priv)->pardev->port; | |
259 | ||
260 | port->ops->write_data (port, data); | |
261 | } | |
262 | ||
263 | inline static unsigned char read_status (struct net_device *dev) | |
264 | { | |
265 | struct parport *port = | |
266 | ((struct net_local *)dev->priv)->pardev->port; | |
267 | ||
268 | return port->ops->read_status (port); | |
269 | } | |
270 | \f | |
271 | /* Entry point of PLIP driver. | |
272 | Probe the hardware, and register/initialize the driver. | |
273 | ||
274 | PLIP is rather weird, because of the way it interacts with the parport | |
275 | system. It is _not_ initialised from Space.c. Instead, plip_init() | |
276 | is called, and that function makes up a "struct net_device" for each port, and | |
277 | then calls us here. | |
278 | ||
279 | */ | |
280 | static void | |
281 | plip_init_netdev(struct net_device *dev) | |
282 | { | |
283 | struct net_local *nl = netdev_priv(dev); | |
284 | ||
285 | /* Then, override parts of it */ | |
286 | dev->hard_start_xmit = plip_tx_packet; | |
287 | dev->open = plip_open; | |
288 | dev->stop = plip_close; | |
289 | dev->get_stats = plip_get_stats; | |
290 | dev->do_ioctl = plip_ioctl; | |
291 | dev->header_cache_update = NULL; | |
292 | dev->tx_queue_len = 10; | |
293 | dev->flags = IFF_POINTOPOINT|IFF_NOARP; | |
294 | memset(dev->dev_addr, 0xfc, ETH_ALEN); | |
295 | ||
296 | /* Set the private structure */ | |
297 | nl->orig_hard_header = dev->hard_header; | |
298 | dev->hard_header = plip_hard_header; | |
299 | ||
300 | nl->orig_hard_header_cache = dev->hard_header_cache; | |
301 | dev->hard_header_cache = plip_hard_header_cache; | |
302 | ||
303 | ||
304 | nl->port_owner = 0; | |
305 | ||
306 | /* Initialize constants */ | |
307 | nl->trigger = PLIP_TRIGGER_WAIT; | |
308 | nl->nibble = PLIP_NIBBLE_WAIT; | |
309 | ||
310 | /* Initialize task queue structures */ | |
311 | INIT_WORK(&nl->immediate, (void (*)(void *))plip_bh, dev); | |
312 | INIT_WORK(&nl->deferred, (void (*)(void *))plip_kick_bh, dev); | |
313 | ||
314 | if (dev->irq == -1) | |
315 | INIT_WORK(&nl->timer, (void (*)(void *))plip_timer_bh, dev); | |
316 | ||
317 | spin_lock_init(&nl->lock); | |
318 | } | |
319 | \f | |
320 | /* Bottom half handler for the delayed request. | |
321 | This routine is kicked by do_timer(). | |
322 | Request `plip_bh' to be invoked. */ | |
323 | static void | |
324 | plip_kick_bh(struct net_device *dev) | |
325 | { | |
326 | struct net_local *nl = netdev_priv(dev); | |
327 | ||
328 | if (nl->is_deferred) | |
329 | schedule_work(&nl->immediate); | |
330 | } | |
331 | ||
332 | /* Forward declarations of internal routines */ | |
333 | static int plip_none(struct net_device *, struct net_local *, | |
334 | struct plip_local *, struct plip_local *); | |
335 | static int plip_receive_packet(struct net_device *, struct net_local *, | |
336 | struct plip_local *, struct plip_local *); | |
337 | static int plip_send_packet(struct net_device *, struct net_local *, | |
338 | struct plip_local *, struct plip_local *); | |
339 | static int plip_connection_close(struct net_device *, struct net_local *, | |
340 | struct plip_local *, struct plip_local *); | |
341 | static int plip_error(struct net_device *, struct net_local *, | |
342 | struct plip_local *, struct plip_local *); | |
343 | static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, | |
344 | struct plip_local *snd, | |
345 | struct plip_local *rcv, | |
346 | int error); | |
347 | ||
348 | #define OK 0 | |
349 | #define TIMEOUT 1 | |
350 | #define ERROR 2 | |
351 | #define HS_TIMEOUT 3 | |
352 | ||
353 | typedef int (*plip_func)(struct net_device *dev, struct net_local *nl, | |
354 | struct plip_local *snd, struct plip_local *rcv); | |
355 | ||
356 | static plip_func connection_state_table[] = | |
357 | { | |
358 | plip_none, | |
359 | plip_receive_packet, | |
360 | plip_send_packet, | |
361 | plip_connection_close, | |
362 | plip_error | |
363 | }; | |
364 | ||
365 | /* Bottom half handler of PLIP. */ | |
366 | static void | |
367 | plip_bh(struct net_device *dev) | |
368 | { | |
369 | struct net_local *nl = netdev_priv(dev); | |
370 | struct plip_local *snd = &nl->snd_data; | |
371 | struct plip_local *rcv = &nl->rcv_data; | |
372 | plip_func f; | |
373 | int r; | |
374 | ||
375 | nl->is_deferred = 0; | |
376 | f = connection_state_table[nl->connection]; | |
377 | if ((r = (*f)(dev, nl, snd, rcv)) != OK | |
378 | && (r = plip_bh_timeout_error(dev, nl, snd, rcv, r)) != OK) { | |
379 | nl->is_deferred = 1; | |
380 | schedule_delayed_work(&nl->deferred, 1); | |
381 | } | |
382 | } | |
383 | ||
384 | static void | |
385 | plip_timer_bh(struct net_device *dev) | |
386 | { | |
387 | struct net_local *nl = netdev_priv(dev); | |
388 | ||
389 | if (!(atomic_read (&nl->kill_timer))) { | |
390 | plip_interrupt (-1, dev, NULL); | |
391 | ||
392 | schedule_delayed_work(&nl->timer, 1); | |
393 | } | |
394 | else { | |
395 | up (&nl->killed_timer_sem); | |
396 | } | |
397 | } | |
398 | ||
399 | static int | |
400 | plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, | |
401 | struct plip_local *snd, struct plip_local *rcv, | |
402 | int error) | |
403 | { | |
404 | unsigned char c0; | |
405 | /* | |
406 | * This is tricky. If we got here from the beginning of send (either | |
407 | * with ERROR or HS_TIMEOUT) we have IRQ enabled. Otherwise it's | |
408 | * already disabled. With the old variant of {enable,disable}_irq() | |
409 | * extra disable_irq() was a no-op. Now it became mortal - it's | |
410 | * unbalanced and thus we'll never re-enable IRQ (until rmmod plip, | |
411 | * that is). So we have to treat HS_TIMEOUT and ERROR from send | |
412 | * in a special way. | |
413 | */ | |
414 | ||
415 | spin_lock_irq(&nl->lock); | |
416 | if (nl->connection == PLIP_CN_SEND) { | |
417 | ||
418 | if (error != ERROR) { /* Timeout */ | |
419 | nl->timeout_count++; | |
420 | if ((error == HS_TIMEOUT | |
421 | && nl->timeout_count <= 10) | |
422 | || nl->timeout_count <= 3) { | |
423 | spin_unlock_irq(&nl->lock); | |
424 | /* Try again later */ | |
425 | return TIMEOUT; | |
426 | } | |
427 | c0 = read_status(dev); | |
428 | printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n", | |
429 | dev->name, snd->state, c0); | |
430 | } else | |
431 | error = HS_TIMEOUT; | |
432 | nl->enet_stats.tx_errors++; | |
433 | nl->enet_stats.tx_aborted_errors++; | |
434 | } else if (nl->connection == PLIP_CN_RECEIVE) { | |
435 | if (rcv->state == PLIP_PK_TRIGGER) { | |
436 | /* Transmission was interrupted. */ | |
437 | spin_unlock_irq(&nl->lock); | |
438 | return OK; | |
439 | } | |
440 | if (error != ERROR) { /* Timeout */ | |
441 | if (++nl->timeout_count <= 3) { | |
442 | spin_unlock_irq(&nl->lock); | |
443 | /* Try again later */ | |
444 | return TIMEOUT; | |
445 | } | |
446 | c0 = read_status(dev); | |
447 | printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n", | |
448 | dev->name, rcv->state, c0); | |
449 | } | |
450 | nl->enet_stats.rx_dropped++; | |
451 | } | |
452 | rcv->state = PLIP_PK_DONE; | |
453 | if (rcv->skb) { | |
454 | kfree_skb(rcv->skb); | |
455 | rcv->skb = NULL; | |
456 | } | |
457 | snd->state = PLIP_PK_DONE; | |
458 | if (snd->skb) { | |
459 | dev_kfree_skb(snd->skb); | |
460 | snd->skb = NULL; | |
461 | } | |
462 | spin_unlock_irq(&nl->lock); | |
463 | if (error == HS_TIMEOUT) { | |
464 | DISABLE(dev->irq); | |
465 | synchronize_irq(dev->irq); | |
466 | } | |
467 | disable_parport_interrupts (dev); | |
468 | netif_stop_queue (dev); | |
469 | nl->connection = PLIP_CN_ERROR; | |
470 | write_data (dev, 0x00); | |
471 | ||
472 | return TIMEOUT; | |
473 | } | |
474 | \f | |
475 | static int | |
476 | plip_none(struct net_device *dev, struct net_local *nl, | |
477 | struct plip_local *snd, struct plip_local *rcv) | |
478 | { | |
479 | return OK; | |
480 | } | |
481 | ||
482 | /* PLIP_RECEIVE --- receive a byte(two nibbles) | |
483 | Returns OK on success, TIMEOUT on timeout */ | |
484 | inline static int | |
485 | plip_receive(unsigned short nibble_timeout, struct net_device *dev, | |
486 | enum plip_nibble_state *ns_p, unsigned char *data_p) | |
487 | { | |
488 | unsigned char c0, c1; | |
489 | unsigned int cx; | |
490 | ||
491 | switch (*ns_p) { | |
492 | case PLIP_NB_BEGIN: | |
493 | cx = nibble_timeout; | |
494 | while (1) { | |
495 | c0 = read_status(dev); | |
496 | udelay(PLIP_DELAY_UNIT); | |
497 | if ((c0 & 0x80) == 0) { | |
498 | c1 = read_status(dev); | |
499 | if (c0 == c1) | |
500 | break; | |
501 | } | |
502 | if (--cx == 0) | |
503 | return TIMEOUT; | |
504 | } | |
505 | *data_p = (c0 >> 3) & 0x0f; | |
506 | write_data (dev, 0x10); /* send ACK */ | |
507 | *ns_p = PLIP_NB_1; | |
508 | ||
509 | case PLIP_NB_1: | |
510 | cx = nibble_timeout; | |
511 | while (1) { | |
512 | c0 = read_status(dev); | |
513 | udelay(PLIP_DELAY_UNIT); | |
514 | if (c0 & 0x80) { | |
515 | c1 = read_status(dev); | |
516 | if (c0 == c1) | |
517 | break; | |
518 | } | |
519 | if (--cx == 0) | |
520 | return TIMEOUT; | |
521 | } | |
522 | *data_p |= (c0 << 1) & 0xf0; | |
523 | write_data (dev, 0x00); /* send ACK */ | |
524 | *ns_p = PLIP_NB_BEGIN; | |
525 | case PLIP_NB_2: | |
526 | break; | |
527 | } | |
528 | return OK; | |
529 | } | |
530 | ||
531 | /* | |
532 | * Determine the packet's protocol ID. The rule here is that we | |
533 | * assume 802.3 if the type field is short enough to be a length. | |
534 | * This is normal practice and works for any 'now in use' protocol. | |
535 | * | |
536 | * PLIP is ethernet ish but the daddr might not be valid if unicast. | |
537 | * PLIP fortunately has no bus architecture (its Point-to-point). | |
538 | * | |
539 | * We can't fix the daddr thing as that quirk (more bug) is embedded | |
540 | * in far too many old systems not all even running Linux. | |
541 | */ | |
542 | ||
543 | static unsigned short plip_type_trans(struct sk_buff *skb, struct net_device *dev) | |
544 | { | |
545 | struct ethhdr *eth; | |
546 | unsigned char *rawp; | |
547 | ||
548 | skb->mac.raw=skb->data; | |
549 | skb_pull(skb,dev->hard_header_len); | |
550 | eth = eth_hdr(skb); | |
551 | ||
552 | if(*eth->h_dest&1) | |
553 | { | |
554 | if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0) | |
555 | skb->pkt_type=PACKET_BROADCAST; | |
556 | else | |
557 | skb->pkt_type=PACKET_MULTICAST; | |
558 | } | |
559 | ||
560 | /* | |
561 | * This ALLMULTI check should be redundant by 1.4 | |
562 | * so don't forget to remove it. | |
563 | */ | |
564 | ||
565 | if (ntohs(eth->h_proto) >= 1536) | |
566 | return eth->h_proto; | |
567 | ||
568 | rawp = skb->data; | |
569 | ||
570 | /* | |
571 | * This is a magic hack to spot IPX packets. Older Novell breaks | |
572 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
573 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
574 | * won't work for fault tolerant netware but does for the rest. | |
575 | */ | |
576 | if (*(unsigned short *)rawp == 0xFFFF) | |
577 | return htons(ETH_P_802_3); | |
578 | ||
579 | /* | |
580 | * Real 802.2 LLC | |
581 | */ | |
582 | return htons(ETH_P_802_2); | |
583 | } | |
584 | ||
585 | ||
586 | /* PLIP_RECEIVE_PACKET --- receive a packet */ | |
587 | static int | |
588 | plip_receive_packet(struct net_device *dev, struct net_local *nl, | |
589 | struct plip_local *snd, struct plip_local *rcv) | |
590 | { | |
591 | unsigned short nibble_timeout = nl->nibble; | |
592 | unsigned char *lbuf; | |
593 | ||
594 | switch (rcv->state) { | |
595 | case PLIP_PK_TRIGGER: | |
596 | DISABLE(dev->irq); | |
597 | /* Don't need to synchronize irq, as we can safely ignore it */ | |
598 | disable_parport_interrupts (dev); | |
599 | write_data (dev, 0x01); /* send ACK */ | |
600 | if (net_debug > 2) | |
601 | printk(KERN_DEBUG "%s: receive start\n", dev->name); | |
602 | rcv->state = PLIP_PK_LENGTH_LSB; | |
603 | rcv->nibble = PLIP_NB_BEGIN; | |
604 | ||
605 | case PLIP_PK_LENGTH_LSB: | |
606 | if (snd->state != PLIP_PK_DONE) { | |
607 | if (plip_receive(nl->trigger, dev, | |
608 | &rcv->nibble, &rcv->length.b.lsb)) { | |
609 | /* collision, here dev->tbusy == 1 */ | |
610 | rcv->state = PLIP_PK_DONE; | |
611 | nl->is_deferred = 1; | |
612 | nl->connection = PLIP_CN_SEND; | |
613 | schedule_delayed_work(&nl->deferred, 1); | |
614 | enable_parport_interrupts (dev); | |
615 | ENABLE(dev->irq); | |
616 | return OK; | |
617 | } | |
618 | } else { | |
619 | if (plip_receive(nibble_timeout, dev, | |
620 | &rcv->nibble, &rcv->length.b.lsb)) | |
621 | return TIMEOUT; | |
622 | } | |
623 | rcv->state = PLIP_PK_LENGTH_MSB; | |
624 | ||
625 | case PLIP_PK_LENGTH_MSB: | |
626 | if (plip_receive(nibble_timeout, dev, | |
627 | &rcv->nibble, &rcv->length.b.msb)) | |
628 | return TIMEOUT; | |
629 | if (rcv->length.h > dev->mtu + dev->hard_header_len | |
630 | || rcv->length.h < 8) { | |
631 | printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h); | |
632 | return ERROR; | |
633 | } | |
634 | /* Malloc up new buffer. */ | |
635 | rcv->skb = dev_alloc_skb(rcv->length.h + 2); | |
636 | if (rcv->skb == NULL) { | |
637 | printk(KERN_ERR "%s: Memory squeeze.\n", dev->name); | |
638 | return ERROR; | |
639 | } | |
640 | skb_reserve(rcv->skb, 2); /* Align IP on 16 byte boundaries */ | |
641 | skb_put(rcv->skb,rcv->length.h); | |
642 | rcv->skb->dev = dev; | |
643 | rcv->state = PLIP_PK_DATA; | |
644 | rcv->byte = 0; | |
645 | rcv->checksum = 0; | |
646 | ||
647 | case PLIP_PK_DATA: | |
648 | lbuf = rcv->skb->data; | |
649 | do | |
650 | if (plip_receive(nibble_timeout, dev, | |
651 | &rcv->nibble, &lbuf[rcv->byte])) | |
652 | return TIMEOUT; | |
653 | while (++rcv->byte < rcv->length.h); | |
654 | do | |
655 | rcv->checksum += lbuf[--rcv->byte]; | |
656 | while (rcv->byte); | |
657 | rcv->state = PLIP_PK_CHECKSUM; | |
658 | ||
659 | case PLIP_PK_CHECKSUM: | |
660 | if (plip_receive(nibble_timeout, dev, | |
661 | &rcv->nibble, &rcv->data)) | |
662 | return TIMEOUT; | |
663 | if (rcv->data != rcv->checksum) { | |
664 | nl->enet_stats.rx_crc_errors++; | |
665 | if (net_debug) | |
666 | printk(KERN_DEBUG "%s: checksum error\n", dev->name); | |
667 | return ERROR; | |
668 | } | |
669 | rcv->state = PLIP_PK_DONE; | |
670 | ||
671 | case PLIP_PK_DONE: | |
672 | /* Inform the upper layer for the arrival of a packet. */ | |
673 | rcv->skb->protocol=plip_type_trans(rcv->skb, dev); | |
674 | netif_rx(rcv->skb); | |
675 | dev->last_rx = jiffies; | |
676 | nl->enet_stats.rx_bytes += rcv->length.h; | |
677 | nl->enet_stats.rx_packets++; | |
678 | rcv->skb = NULL; | |
679 | if (net_debug > 2) | |
680 | printk(KERN_DEBUG "%s: receive end\n", dev->name); | |
681 | ||
682 | /* Close the connection. */ | |
683 | write_data (dev, 0x00); | |
684 | spin_lock_irq(&nl->lock); | |
685 | if (snd->state != PLIP_PK_DONE) { | |
686 | nl->connection = PLIP_CN_SEND; | |
687 | spin_unlock_irq(&nl->lock); | |
688 | schedule_work(&nl->immediate); | |
689 | enable_parport_interrupts (dev); | |
690 | ENABLE(dev->irq); | |
691 | return OK; | |
692 | } else { | |
693 | nl->connection = PLIP_CN_NONE; | |
694 | spin_unlock_irq(&nl->lock); | |
695 | enable_parport_interrupts (dev); | |
696 | ENABLE(dev->irq); | |
697 | return OK; | |
698 | } | |
699 | } | |
700 | return OK; | |
701 | } | |
702 | ||
703 | /* PLIP_SEND --- send a byte (two nibbles) | |
704 | Returns OK on success, TIMEOUT when timeout */ | |
705 | inline static int | |
706 | plip_send(unsigned short nibble_timeout, struct net_device *dev, | |
707 | enum plip_nibble_state *ns_p, unsigned char data) | |
708 | { | |
709 | unsigned char c0; | |
710 | unsigned int cx; | |
711 | ||
712 | switch (*ns_p) { | |
713 | case PLIP_NB_BEGIN: | |
714 | write_data (dev, data & 0x0f); | |
715 | *ns_p = PLIP_NB_1; | |
716 | ||
717 | case PLIP_NB_1: | |
718 | write_data (dev, 0x10 | (data & 0x0f)); | |
719 | cx = nibble_timeout; | |
720 | while (1) { | |
721 | c0 = read_status(dev); | |
722 | if ((c0 & 0x80) == 0) | |
723 | break; | |
724 | if (--cx == 0) | |
725 | return TIMEOUT; | |
726 | udelay(PLIP_DELAY_UNIT); | |
727 | } | |
728 | write_data (dev, 0x10 | (data >> 4)); | |
729 | *ns_p = PLIP_NB_2; | |
730 | ||
731 | case PLIP_NB_2: | |
732 | write_data (dev, (data >> 4)); | |
733 | cx = nibble_timeout; | |
734 | while (1) { | |
735 | c0 = read_status(dev); | |
736 | if (c0 & 0x80) | |
737 | break; | |
738 | if (--cx == 0) | |
739 | return TIMEOUT; | |
740 | udelay(PLIP_DELAY_UNIT); | |
741 | } | |
742 | *ns_p = PLIP_NB_BEGIN; | |
743 | return OK; | |
744 | } | |
745 | return OK; | |
746 | } | |
747 | ||
748 | /* PLIP_SEND_PACKET --- send a packet */ | |
749 | static int | |
750 | plip_send_packet(struct net_device *dev, struct net_local *nl, | |
751 | struct plip_local *snd, struct plip_local *rcv) | |
752 | { | |
753 | unsigned short nibble_timeout = nl->nibble; | |
754 | unsigned char *lbuf; | |
755 | unsigned char c0; | |
756 | unsigned int cx; | |
757 | ||
758 | if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) { | |
759 | printk(KERN_DEBUG "%s: send skb lost\n", dev->name); | |
760 | snd->state = PLIP_PK_DONE; | |
761 | snd->skb = NULL; | |
762 | return ERROR; | |
763 | } | |
764 | ||
765 | switch (snd->state) { | |
766 | case PLIP_PK_TRIGGER: | |
767 | if ((read_status(dev) & 0xf8) != 0x80) | |
768 | return HS_TIMEOUT; | |
769 | ||
770 | /* Trigger remote rx interrupt. */ | |
771 | write_data (dev, 0x08); | |
772 | cx = nl->trigger; | |
773 | while (1) { | |
774 | udelay(PLIP_DELAY_UNIT); | |
775 | spin_lock_irq(&nl->lock); | |
776 | if (nl->connection == PLIP_CN_RECEIVE) { | |
777 | spin_unlock_irq(&nl->lock); | |
778 | /* Interrupted. */ | |
779 | nl->enet_stats.collisions++; | |
780 | return OK; | |
781 | } | |
782 | c0 = read_status(dev); | |
783 | if (c0 & 0x08) { | |
784 | spin_unlock_irq(&nl->lock); | |
785 | DISABLE(dev->irq); | |
786 | synchronize_irq(dev->irq); | |
787 | if (nl->connection == PLIP_CN_RECEIVE) { | |
788 | /* Interrupted. | |
789 | We don't need to enable irq, | |
790 | as it is soon disabled. */ | |
791 | /* Yes, we do. New variant of | |
792 | {enable,disable}_irq *counts* | |
793 | them. -- AV */ | |
794 | ENABLE(dev->irq); | |
795 | nl->enet_stats.collisions++; | |
796 | return OK; | |
797 | } | |
798 | disable_parport_interrupts (dev); | |
799 | if (net_debug > 2) | |
800 | printk(KERN_DEBUG "%s: send start\n", dev->name); | |
801 | snd->state = PLIP_PK_LENGTH_LSB; | |
802 | snd->nibble = PLIP_NB_BEGIN; | |
803 | nl->timeout_count = 0; | |
804 | break; | |
805 | } | |
806 | spin_unlock_irq(&nl->lock); | |
807 | if (--cx == 0) { | |
808 | write_data (dev, 0x00); | |
809 | return HS_TIMEOUT; | |
810 | } | |
811 | } | |
812 | ||
813 | case PLIP_PK_LENGTH_LSB: | |
814 | if (plip_send(nibble_timeout, dev, | |
815 | &snd->nibble, snd->length.b.lsb)) | |
816 | return TIMEOUT; | |
817 | snd->state = PLIP_PK_LENGTH_MSB; | |
818 | ||
819 | case PLIP_PK_LENGTH_MSB: | |
820 | if (plip_send(nibble_timeout, dev, | |
821 | &snd->nibble, snd->length.b.msb)) | |
822 | return TIMEOUT; | |
823 | snd->state = PLIP_PK_DATA; | |
824 | snd->byte = 0; | |
825 | snd->checksum = 0; | |
826 | ||
827 | case PLIP_PK_DATA: | |
828 | do | |
829 | if (plip_send(nibble_timeout, dev, | |
830 | &snd->nibble, lbuf[snd->byte])) | |
831 | return TIMEOUT; | |
832 | while (++snd->byte < snd->length.h); | |
833 | do | |
834 | snd->checksum += lbuf[--snd->byte]; | |
835 | while (snd->byte); | |
836 | snd->state = PLIP_PK_CHECKSUM; | |
837 | ||
838 | case PLIP_PK_CHECKSUM: | |
839 | if (plip_send(nibble_timeout, dev, | |
840 | &snd->nibble, snd->checksum)) | |
841 | return TIMEOUT; | |
842 | ||
843 | nl->enet_stats.tx_bytes += snd->skb->len; | |
844 | dev_kfree_skb(snd->skb); | |
845 | nl->enet_stats.tx_packets++; | |
846 | snd->state = PLIP_PK_DONE; | |
847 | ||
848 | case PLIP_PK_DONE: | |
849 | /* Close the connection */ | |
850 | write_data (dev, 0x00); | |
851 | snd->skb = NULL; | |
852 | if (net_debug > 2) | |
853 | printk(KERN_DEBUG "%s: send end\n", dev->name); | |
854 | nl->connection = PLIP_CN_CLOSING; | |
855 | nl->is_deferred = 1; | |
856 | schedule_delayed_work(&nl->deferred, 1); | |
857 | enable_parport_interrupts (dev); | |
858 | ENABLE(dev->irq); | |
859 | return OK; | |
860 | } | |
861 | return OK; | |
862 | } | |
863 | ||
864 | static int | |
865 | plip_connection_close(struct net_device *dev, struct net_local *nl, | |
866 | struct plip_local *snd, struct plip_local *rcv) | |
867 | { | |
868 | spin_lock_irq(&nl->lock); | |
869 | if (nl->connection == PLIP_CN_CLOSING) { | |
870 | nl->connection = PLIP_CN_NONE; | |
871 | netif_wake_queue (dev); | |
872 | } | |
873 | spin_unlock_irq(&nl->lock); | |
874 | if (nl->should_relinquish) { | |
875 | nl->should_relinquish = nl->port_owner = 0; | |
876 | parport_release(nl->pardev); | |
877 | } | |
878 | return OK; | |
879 | } | |
880 | ||
881 | /* PLIP_ERROR --- wait till other end settled */ | |
882 | static int | |
883 | plip_error(struct net_device *dev, struct net_local *nl, | |
884 | struct plip_local *snd, struct plip_local *rcv) | |
885 | { | |
886 | unsigned char status; | |
887 | ||
888 | status = read_status(dev); | |
889 | if ((status & 0xf8) == 0x80) { | |
890 | if (net_debug > 2) | |
891 | printk(KERN_DEBUG "%s: reset interface.\n", dev->name); | |
892 | nl->connection = PLIP_CN_NONE; | |
893 | nl->should_relinquish = 0; | |
894 | netif_start_queue (dev); | |
895 | enable_parport_interrupts (dev); | |
896 | ENABLE(dev->irq); | |
897 | netif_wake_queue (dev); | |
898 | } else { | |
899 | nl->is_deferred = 1; | |
900 | schedule_delayed_work(&nl->deferred, 1); | |
901 | } | |
902 | ||
903 | return OK; | |
904 | } | |
905 | \f | |
906 | /* Handle the parallel port interrupts. */ | |
907 | static void | |
908 | plip_interrupt(int irq, void *dev_id, struct pt_regs * regs) | |
909 | { | |
910 | struct net_device *dev = dev_id; | |
911 | struct net_local *nl; | |
912 | struct plip_local *rcv; | |
913 | unsigned char c0; | |
914 | ||
915 | if (dev == NULL) { | |
916 | printk(KERN_DEBUG "plip_interrupt: irq %d for unknown device.\n", irq); | |
917 | return; | |
918 | } | |
919 | ||
920 | nl = netdev_priv(dev); | |
921 | rcv = &nl->rcv_data; | |
922 | ||
923 | spin_lock_irq (&nl->lock); | |
924 | ||
925 | c0 = read_status(dev); | |
926 | if ((c0 & 0xf8) != 0xc0) { | |
927 | if ((dev->irq != -1) && (net_debug > 1)) | |
928 | printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name); | |
929 | spin_unlock_irq (&nl->lock); | |
930 | return; | |
931 | } | |
932 | ||
933 | if (net_debug > 3) | |
934 | printk(KERN_DEBUG "%s: interrupt.\n", dev->name); | |
935 | ||
936 | switch (nl->connection) { | |
937 | case PLIP_CN_CLOSING: | |
938 | netif_wake_queue (dev); | |
939 | case PLIP_CN_NONE: | |
940 | case PLIP_CN_SEND: | |
941 | rcv->state = PLIP_PK_TRIGGER; | |
942 | nl->connection = PLIP_CN_RECEIVE; | |
943 | nl->timeout_count = 0; | |
944 | schedule_work(&nl->immediate); | |
945 | break; | |
946 | ||
947 | case PLIP_CN_RECEIVE: | |
948 | /* May occur because there is race condition | |
949 | around test and set of dev->interrupt. | |
950 | Ignore this interrupt. */ | |
951 | break; | |
952 | ||
953 | case PLIP_CN_ERROR: | |
954 | printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name); | |
955 | break; | |
956 | } | |
957 | ||
958 | spin_unlock_irq(&nl->lock); | |
959 | } | |
960 | \f | |
961 | static int | |
962 | plip_tx_packet(struct sk_buff *skb, struct net_device *dev) | |
963 | { | |
964 | struct net_local *nl = netdev_priv(dev); | |
965 | struct plip_local *snd = &nl->snd_data; | |
966 | ||
967 | if (netif_queue_stopped(dev)) | |
968 | return 1; | |
969 | ||
970 | /* We may need to grab the bus */ | |
971 | if (!nl->port_owner) { | |
972 | if (parport_claim(nl->pardev)) | |
973 | return 1; | |
974 | nl->port_owner = 1; | |
975 | } | |
976 | ||
977 | netif_stop_queue (dev); | |
978 | ||
979 | if (skb->len > dev->mtu + dev->hard_header_len) { | |
980 | printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len); | |
981 | netif_start_queue (dev); | |
982 | return 1; | |
983 | } | |
984 | ||
985 | if (net_debug > 2) | |
986 | printk(KERN_DEBUG "%s: send request\n", dev->name); | |
987 | ||
988 | spin_lock_irq(&nl->lock); | |
989 | dev->trans_start = jiffies; | |
990 | snd->skb = skb; | |
991 | snd->length.h = skb->len; | |
992 | snd->state = PLIP_PK_TRIGGER; | |
993 | if (nl->connection == PLIP_CN_NONE) { | |
994 | nl->connection = PLIP_CN_SEND; | |
995 | nl->timeout_count = 0; | |
996 | } | |
997 | schedule_work(&nl->immediate); | |
998 | spin_unlock_irq(&nl->lock); | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static void | |
1004 | plip_rewrite_address(struct net_device *dev, struct ethhdr *eth) | |
1005 | { | |
1006 | struct in_device *in_dev; | |
1007 | ||
1008 | if ((in_dev=dev->ip_ptr) != NULL) { | |
1009 | /* Any address will do - we take the first */ | |
1010 | struct in_ifaddr *ifa=in_dev->ifa_list; | |
1011 | if (ifa != NULL) { | |
1012 | memcpy(eth->h_source, dev->dev_addr, 6); | |
1013 | memset(eth->h_dest, 0xfc, 2); | |
1014 | memcpy(eth->h_dest+2, &ifa->ifa_address, 4); | |
1015 | } | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | static int | |
1020 | plip_hard_header(struct sk_buff *skb, struct net_device *dev, | |
1021 | unsigned short type, void *daddr, | |
1022 | void *saddr, unsigned len) | |
1023 | { | |
1024 | struct net_local *nl = netdev_priv(dev); | |
1025 | int ret; | |
1026 | ||
1027 | if ((ret = nl->orig_hard_header(skb, dev, type, daddr, saddr, len)) >= 0) | |
1028 | plip_rewrite_address (dev, (struct ethhdr *)skb->data); | |
1029 | ||
1030 | return ret; | |
1031 | } | |
1032 | ||
1033 | int plip_hard_header_cache(struct neighbour *neigh, | |
1034 | struct hh_cache *hh) | |
1035 | { | |
1036 | struct net_local *nl = neigh->dev->priv; | |
1037 | int ret; | |
1038 | ||
1039 | if ((ret = nl->orig_hard_header_cache(neigh, hh)) == 0) | |
1040 | { | |
1041 | struct ethhdr *eth; | |
1042 | ||
1043 | eth = (struct ethhdr*)(((u8*)hh->hh_data) + | |
1044 | HH_DATA_OFF(sizeof(*eth))); | |
1045 | plip_rewrite_address (neigh->dev, eth); | |
1046 | } | |
1047 | ||
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | /* Open/initialize the board. This is called (in the current kernel) | |
1052 | sometime after booting when the 'ifconfig' program is run. | |
1053 | ||
1054 | This routine gets exclusive access to the parallel port by allocating | |
1055 | its IRQ line. | |
1056 | */ | |
1057 | static int | |
1058 | plip_open(struct net_device *dev) | |
1059 | { | |
1060 | struct net_local *nl = netdev_priv(dev); | |
1061 | struct in_device *in_dev; | |
1062 | ||
1063 | /* Grab the port */ | |
1064 | if (!nl->port_owner) { | |
1065 | if (parport_claim(nl->pardev)) return -EAGAIN; | |
1066 | nl->port_owner = 1; | |
1067 | } | |
1068 | ||
1069 | nl->should_relinquish = 0; | |
1070 | ||
1071 | /* Clear the data port. */ | |
1072 | write_data (dev, 0x00); | |
1073 | ||
1074 | /* Enable rx interrupt. */ | |
1075 | enable_parport_interrupts (dev); | |
1076 | if (dev->irq == -1) | |
1077 | { | |
1078 | atomic_set (&nl->kill_timer, 0); | |
1079 | schedule_delayed_work(&nl->timer, 1); | |
1080 | } | |
1081 | ||
1082 | /* Initialize the state machine. */ | |
1083 | nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE; | |
1084 | nl->rcv_data.skb = nl->snd_data.skb = NULL; | |
1085 | nl->connection = PLIP_CN_NONE; | |
1086 | nl->is_deferred = 0; | |
1087 | ||
1088 | /* Fill in the MAC-level header. | |
1089 | We used to abuse dev->broadcast to store the point-to-point | |
1090 | MAC address, but we no longer do it. Instead, we fetch the | |
1091 | interface address whenever it is needed, which is cheap enough | |
1092 | because we use the hh_cache. Actually, abusing dev->broadcast | |
1093 | didn't work, because when using plip_open the point-to-point | |
1094 | address isn't yet known. | |
1095 | PLIP doesn't have a real MAC address, but we need it to be | |
1096 | DOS compatible, and to properly support taps (otherwise, | |
1097 | when the device address isn't identical to the address of a | |
1098 | received frame, the kernel incorrectly drops it). */ | |
1099 | ||
1100 | if ((in_dev=dev->ip_ptr) != NULL) { | |
1101 | /* Any address will do - we take the first. We already | |
1102 | have the first two bytes filled with 0xfc, from | |
1103 | plip_init_dev(). */ | |
1104 | struct in_ifaddr *ifa=in_dev->ifa_list; | |
1105 | if (ifa != NULL) { | |
1106 | memcpy(dev->dev_addr+2, &ifa->ifa_local, 4); | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | netif_start_queue (dev); | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | /* The inverse routine to plip_open (). */ | |
1116 | static int | |
1117 | plip_close(struct net_device *dev) | |
1118 | { | |
1119 | struct net_local *nl = netdev_priv(dev); | |
1120 | struct plip_local *snd = &nl->snd_data; | |
1121 | struct plip_local *rcv = &nl->rcv_data; | |
1122 | ||
1123 | netif_stop_queue (dev); | |
1124 | DISABLE(dev->irq); | |
1125 | synchronize_irq(dev->irq); | |
1126 | ||
1127 | if (dev->irq == -1) | |
1128 | { | |
1129 | init_MUTEX_LOCKED (&nl->killed_timer_sem); | |
1130 | atomic_set (&nl->kill_timer, 1); | |
1131 | down (&nl->killed_timer_sem); | |
1132 | } | |
1133 | ||
1134 | #ifdef NOTDEF | |
1135 | outb(0x00, PAR_DATA(dev)); | |
1136 | #endif | |
1137 | nl->is_deferred = 0; | |
1138 | nl->connection = PLIP_CN_NONE; | |
1139 | if (nl->port_owner) { | |
1140 | parport_release(nl->pardev); | |
1141 | nl->port_owner = 0; | |
1142 | } | |
1143 | ||
1144 | snd->state = PLIP_PK_DONE; | |
1145 | if (snd->skb) { | |
1146 | dev_kfree_skb(snd->skb); | |
1147 | snd->skb = NULL; | |
1148 | } | |
1149 | rcv->state = PLIP_PK_DONE; | |
1150 | if (rcv->skb) { | |
1151 | kfree_skb(rcv->skb); | |
1152 | rcv->skb = NULL; | |
1153 | } | |
1154 | ||
1155 | #ifdef NOTDEF | |
1156 | /* Reset. */ | |
1157 | outb(0x00, PAR_CONTROL(dev)); | |
1158 | #endif | |
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | static int | |
1163 | plip_preempt(void *handle) | |
1164 | { | |
1165 | struct net_device *dev = (struct net_device *)handle; | |
1166 | struct net_local *nl = netdev_priv(dev); | |
1167 | ||
1168 | /* Stand our ground if a datagram is on the wire */ | |
1169 | if (nl->connection != PLIP_CN_NONE) { | |
1170 | nl->should_relinquish = 1; | |
1171 | return 1; | |
1172 | } | |
1173 | ||
1174 | nl->port_owner = 0; /* Remember that we released the bus */ | |
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | static void | |
1179 | plip_wakeup(void *handle) | |
1180 | { | |
1181 | struct net_device *dev = (struct net_device *)handle; | |
1182 | struct net_local *nl = netdev_priv(dev); | |
1183 | ||
1184 | if (nl->port_owner) { | |
1185 | /* Why are we being woken up? */ | |
1186 | printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name); | |
1187 | if (!parport_claim(nl->pardev)) | |
1188 | /* bus_owner is already set (but why?) */ | |
1189 | printk(KERN_DEBUG "%s: I'm broken.\n", dev->name); | |
1190 | else | |
1191 | return; | |
1192 | } | |
1193 | ||
1194 | if (!(dev->flags & IFF_UP)) | |
1195 | /* Don't need the port when the interface is down */ | |
1196 | return; | |
1197 | ||
1198 | if (!parport_claim(nl->pardev)) { | |
1199 | nl->port_owner = 1; | |
1200 | /* Clear the data port. */ | |
1201 | write_data (dev, 0x00); | |
1202 | } | |
1203 | ||
1204 | return; | |
1205 | } | |
1206 | ||
1207 | static struct net_device_stats * | |
1208 | plip_get_stats(struct net_device *dev) | |
1209 | { | |
1210 | struct net_local *nl = netdev_priv(dev); | |
1211 | struct net_device_stats *r = &nl->enet_stats; | |
1212 | ||
1213 | return r; | |
1214 | } | |
1215 | ||
1216 | static int | |
1217 | plip_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
1218 | { | |
1219 | struct net_local *nl = netdev_priv(dev); | |
1220 | struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru; | |
1221 | ||
1222 | if (cmd != SIOCDEVPLIP) | |
1223 | return -EOPNOTSUPP; | |
1224 | ||
1225 | switch(pc->pcmd) { | |
1226 | case PLIP_GET_TIMEOUT: | |
1227 | pc->trigger = nl->trigger; | |
1228 | pc->nibble = nl->nibble; | |
1229 | break; | |
1230 | case PLIP_SET_TIMEOUT: | |
1231 | if(!capable(CAP_NET_ADMIN)) | |
1232 | return -EPERM; | |
1233 | nl->trigger = pc->trigger; | |
1234 | nl->nibble = pc->nibble; | |
1235 | break; | |
1236 | default: | |
1237 | return -EOPNOTSUPP; | |
1238 | } | |
1239 | return 0; | |
1240 | } | |
1241 | \f | |
1242 | static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 }; | |
1243 | static int timid; | |
1244 | ||
1245 | module_param_array(parport, int, NULL, 0); | |
1246 | module_param(timid, int, 0); | |
1247 | MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip"); | |
1248 | ||
1249 | static struct net_device *dev_plip[PLIP_MAX] = { NULL, }; | |
1250 | ||
1251 | static inline int | |
1252 | plip_searchfor(int list[], int a) | |
1253 | { | |
1254 | int i; | |
1255 | for (i = 0; i < PLIP_MAX && list[i] != -1; i++) { | |
1256 | if (list[i] == a) return 1; | |
1257 | } | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | /* plip_attach() is called (by the parport code) when a port is | |
1262 | * available to use. */ | |
1263 | static void plip_attach (struct parport *port) | |
1264 | { | |
1265 | static int unit; | |
1266 | struct net_device *dev; | |
1267 | struct net_local *nl; | |
1268 | char name[IFNAMSIZ]; | |
1269 | ||
1270 | if ((parport[0] == -1 && (!timid || !port->devices)) || | |
1271 | plip_searchfor(parport, port->number)) { | |
1272 | if (unit == PLIP_MAX) { | |
1273 | printk(KERN_ERR "plip: too many devices\n"); | |
1274 | return; | |
1275 | } | |
1276 | ||
1277 | sprintf(name, "plip%d", unit); | |
1278 | dev = alloc_etherdev(sizeof(struct net_local)); | |
1279 | if (!dev) { | |
1280 | printk(KERN_ERR "plip: memory squeeze\n"); | |
1281 | return; | |
1282 | } | |
1283 | ||
1284 | strcpy(dev->name, name); | |
1285 | ||
1286 | SET_MODULE_OWNER(dev); | |
1287 | dev->irq = port->irq; | |
1288 | dev->base_addr = port->base; | |
1289 | if (port->irq == -1) { | |
1290 | printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode," | |
1291 | "which is fairly inefficient!\n", port->name); | |
1292 | } | |
1293 | ||
1294 | nl = netdev_priv(dev); | |
1295 | nl->pardev = parport_register_device(port, name, plip_preempt, | |
1296 | plip_wakeup, plip_interrupt, | |
1297 | 0, dev); | |
1298 | ||
1299 | if (!nl->pardev) { | |
1300 | printk(KERN_ERR "%s: parport_register failed\n", name); | |
1301 | goto err_free_dev; | |
1302 | return; | |
1303 | } | |
1304 | ||
1305 | plip_init_netdev(dev); | |
1306 | ||
1307 | if (register_netdev(dev)) { | |
1308 | printk(KERN_ERR "%s: network register failed\n", name); | |
1309 | goto err_parport_unregister; | |
1310 | } | |
1311 | ||
1312 | printk(KERN_INFO "%s", version); | |
1313 | if (dev->irq != -1) | |
1314 | printk(KERN_INFO "%s: Parallel port at %#3lx, " | |
1315 | "using IRQ %d.\n", | |
1316 | dev->name, dev->base_addr, dev->irq); | |
1317 | else | |
1318 | printk(KERN_INFO "%s: Parallel port at %#3lx, " | |
1319 | "not using IRQ.\n", | |
1320 | dev->name, dev->base_addr); | |
1321 | dev_plip[unit++] = dev; | |
1322 | } | |
1323 | return; | |
1324 | ||
1325 | err_parport_unregister: | |
1326 | parport_unregister_device(nl->pardev); | |
1327 | err_free_dev: | |
1328 | free_netdev(dev); | |
1329 | return; | |
1330 | } | |
1331 | ||
1332 | /* plip_detach() is called (by the parport code) when a port is | |
1333 | * no longer available to use. */ | |
1334 | static void plip_detach (struct parport *port) | |
1335 | { | |
1336 | /* Nothing to do */ | |
1337 | } | |
1338 | ||
1339 | static struct parport_driver plip_driver = { | |
1340 | .name = "plip", | |
1341 | .attach = plip_attach, | |
1342 | .detach = plip_detach | |
1343 | }; | |
1344 | ||
1345 | static void __exit plip_cleanup_module (void) | |
1346 | { | |
1347 | struct net_device *dev; | |
1348 | int i; | |
1349 | ||
1350 | parport_unregister_driver (&plip_driver); | |
1351 | ||
1352 | for (i=0; i < PLIP_MAX; i++) { | |
1353 | if ((dev = dev_plip[i])) { | |
1354 | struct net_local *nl = netdev_priv(dev); | |
1355 | unregister_netdev(dev); | |
1356 | if (nl->port_owner) | |
1357 | parport_release(nl->pardev); | |
1358 | parport_unregister_device(nl->pardev); | |
1359 | free_netdev(dev); | |
1360 | dev_plip[i] = NULL; | |
1361 | } | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | #ifndef MODULE | |
1366 | ||
1367 | static int parport_ptr; | |
1368 | ||
1369 | static int __init plip_setup(char *str) | |
1370 | { | |
1371 | int ints[4]; | |
1372 | ||
1373 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
1374 | ||
1375 | /* Ugh. */ | |
1376 | if (!strncmp(str, "parport", 7)) { | |
1377 | int n = simple_strtoul(str+7, NULL, 10); | |
1378 | if (parport_ptr < PLIP_MAX) | |
1379 | parport[parport_ptr++] = n; | |
1380 | else | |
1381 | printk(KERN_INFO "plip: too many ports, %s ignored.\n", | |
1382 | str); | |
1383 | } else if (!strcmp(str, "timid")) { | |
1384 | timid = 1; | |
1385 | } else { | |
1386 | if (ints[0] == 0 || ints[1] == 0) { | |
1387 | /* disable driver on "plip=" or "plip=0" */ | |
1388 | parport[0] = -2; | |
1389 | } else { | |
1390 | printk(KERN_WARNING "warning: 'plip=0x%x' ignored\n", | |
1391 | ints[1]); | |
1392 | } | |
1393 | } | |
1394 | return 1; | |
1395 | } | |
1396 | ||
1397 | __setup("plip=", plip_setup); | |
1398 | ||
1399 | #endif /* !MODULE */ | |
1400 | ||
1401 | static int __init plip_init (void) | |
1402 | { | |
1403 | if (parport[0] == -2) | |
1404 | return 0; | |
1405 | ||
1406 | if (parport[0] != -1 && timid) { | |
1407 | printk(KERN_WARNING "plip: warning, ignoring `timid' since specific ports given.\n"); | |
1408 | timid = 0; | |
1409 | } | |
1410 | ||
1411 | if (parport_register_driver (&plip_driver)) { | |
1412 | printk (KERN_WARNING "plip: couldn't register driver\n"); | |
1413 | return 1; | |
1414 | } | |
1415 | ||
1416 | return 0; | |
1417 | } | |
1418 | ||
1419 | module_init(plip_init); | |
1420 | module_exit(plip_cleanup_module); | |
1421 | MODULE_LICENSE("GPL"); | |
1422 | ||
1423 | /* | |
1424 | * Local variables: | |
1425 | * compile-command: "gcc -DMODULE -DMODVERSIONS -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -g -fomit-frame-pointer -pipe -c plip.c" | |
1426 | * End: | |
1427 | */ |