]>
Commit | Line | Data |
---|---|---|
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), | |
6aa20a22 | 19 | * Modifications to use the parallel port API |
1da177e4 LT |
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> | |
5a0e3ad6 | 97 | #include <linux/slab.h> |
1da177e4 LT |
98 | #include <linux/if_ether.h> |
99 | #include <linux/in.h> | |
100 | #include <linux/errno.h> | |
101 | #include <linux/delay.h> | |
1da177e4 LT |
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> | |
1da177e4 | 109 | #include <linux/spinlock.h> |
01f31ac8 | 110 | #include <linux/completion.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
119 | |
120 | /* Maximum number of devices to support. */ | |
121 | #define PLIP_MAX 8 | |
122 | ||
123 | /* Use 0 for production, 1 for verification, >2 for debug */ | |
124 | #ifndef NET_DEBUG | |
125 | #define NET_DEBUG 1 | |
126 | #endif | |
f71e1309 | 127 | static const unsigned int net_debug = NET_DEBUG; |
1da177e4 LT |
128 | |
129 | #define ENABLE(irq) if (irq != -1) enable_irq(irq) | |
130 | #define DISABLE(irq) if (irq != -1) disable_irq(irq) | |
131 | ||
132 | /* In micro second */ | |
133 | #define PLIP_DELAY_UNIT 1 | |
134 | ||
135 | /* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */ | |
136 | #define PLIP_TRIGGER_WAIT 500 | |
137 | ||
138 | /* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */ | |
139 | #define PLIP_NIBBLE_WAIT 3000 | |
140 | ||
141 | /* Bottom halves */ | |
c4028958 DH |
142 | static void plip_kick_bh(struct work_struct *work); |
143 | static void plip_bh(struct work_struct *work); | |
144 | static void plip_timer_bh(struct work_struct *work); | |
1da177e4 LT |
145 | |
146 | /* Interrupt handler */ | |
5712cb3d | 147 | static void plip_interrupt(void *dev_id); |
1da177e4 LT |
148 | |
149 | /* Functions for DEV methods */ | |
150 | static int plip_tx_packet(struct sk_buff *skb, struct net_device *dev); | |
151 | static int plip_hard_header(struct sk_buff *skb, struct net_device *dev, | |
3b04ddde SH |
152 | unsigned short type, const void *daddr, |
153 | const void *saddr, unsigned len); | |
154 | static int plip_hard_header_cache(const struct neighbour *neigh, | |
1da177e4 LT |
155 | struct hh_cache *hh); |
156 | static int plip_open(struct net_device *dev); | |
157 | static int plip_close(struct net_device *dev); | |
1da177e4 LT |
158 | static int plip_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); |
159 | static int plip_preempt(void *handle); | |
160 | static void plip_wakeup(void *handle); | |
77933d72 | 161 | |
1da177e4 LT |
162 | enum plip_connection_state { |
163 | PLIP_CN_NONE=0, | |
164 | PLIP_CN_RECEIVE, | |
165 | PLIP_CN_SEND, | |
166 | PLIP_CN_CLOSING, | |
167 | PLIP_CN_ERROR | |
168 | }; | |
169 | ||
170 | enum plip_packet_state { | |
171 | PLIP_PK_DONE=0, | |
172 | PLIP_PK_TRIGGER, | |
173 | PLIP_PK_LENGTH_LSB, | |
174 | PLIP_PK_LENGTH_MSB, | |
175 | PLIP_PK_DATA, | |
176 | PLIP_PK_CHECKSUM | |
177 | }; | |
178 | ||
179 | enum plip_nibble_state { | |
180 | PLIP_NB_BEGIN, | |
181 | PLIP_NB_1, | |
182 | PLIP_NB_2, | |
183 | }; | |
184 | ||
185 | struct plip_local { | |
186 | enum plip_packet_state state; | |
187 | enum plip_nibble_state nibble; | |
188 | union { | |
189 | struct { | |
190 | #if defined(__LITTLE_ENDIAN) | |
191 | unsigned char lsb; | |
192 | unsigned char msb; | |
193 | #elif defined(__BIG_ENDIAN) | |
194 | unsigned char msb; | |
195 | unsigned char lsb; | |
196 | #else | |
197 | #error "Please fix the endianness defines in <asm/byteorder.h>" | |
198 | #endif | |
199 | } b; | |
200 | unsigned short h; | |
201 | } length; | |
202 | unsigned short byte; | |
203 | unsigned char checksum; | |
204 | unsigned char data; | |
205 | struct sk_buff *skb; | |
206 | }; | |
207 | ||
208 | struct net_local { | |
c4028958 | 209 | struct net_device *dev; |
1da177e4 | 210 | struct work_struct immediate; |
c4028958 DH |
211 | struct delayed_work deferred; |
212 | struct delayed_work timer; | |
1da177e4 LT |
213 | struct plip_local snd_data; |
214 | struct plip_local rcv_data; | |
215 | struct pardevice *pardev; | |
216 | unsigned long trigger; | |
217 | unsigned long nibble; | |
218 | enum plip_connection_state connection; | |
219 | unsigned short timeout_count; | |
220 | int is_deferred; | |
221 | int port_owner; | |
222 | int should_relinquish; | |
1da177e4 LT |
223 | spinlock_t lock; |
224 | atomic_t kill_timer; | |
01f31ac8 | 225 | struct completion killed_timer_cmp; |
1da177e4 | 226 | }; |
77933d72 JJ |
227 | |
228 | static inline void enable_parport_interrupts (struct net_device *dev) | |
1da177e4 LT |
229 | { |
230 | if (dev->irq != -1) | |
231 | { | |
232 | struct parport *port = | |
4cf1653a | 233 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
1da177e4 LT |
234 | port->ops->enable_irq (port); |
235 | } | |
236 | } | |
237 | ||
77933d72 | 238 | static inline void disable_parport_interrupts (struct net_device *dev) |
1da177e4 LT |
239 | { |
240 | if (dev->irq != -1) | |
241 | { | |
242 | struct parport *port = | |
4cf1653a | 243 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
1da177e4 LT |
244 | port->ops->disable_irq (port); |
245 | } | |
246 | } | |
247 | ||
77933d72 | 248 | static inline void write_data (struct net_device *dev, unsigned char data) |
1da177e4 LT |
249 | { |
250 | struct parport *port = | |
4cf1653a | 251 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
1da177e4 LT |
252 | |
253 | port->ops->write_data (port, data); | |
254 | } | |
255 | ||
77933d72 | 256 | static inline unsigned char read_status (struct net_device *dev) |
1da177e4 LT |
257 | { |
258 | struct parport *port = | |
4cf1653a | 259 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
1da177e4 LT |
260 | |
261 | return port->ops->read_status (port); | |
262 | } | |
77933d72 | 263 | |
3b04ddde SH |
264 | static const struct header_ops plip_header_ops = { |
265 | .create = plip_hard_header, | |
266 | .cache = plip_hard_header_cache, | |
267 | }; | |
268 | ||
ed8cf436 SH |
269 | static const struct net_device_ops plip_netdev_ops = { |
270 | .ndo_open = plip_open, | |
271 | .ndo_stop = plip_close, | |
272 | .ndo_start_xmit = plip_tx_packet, | |
273 | .ndo_do_ioctl = plip_ioctl, | |
635ecaa7 | 274 | .ndo_change_mtu = eth_change_mtu, |
240c102d BH |
275 | .ndo_set_mac_address = eth_mac_addr, |
276 | .ndo_validate_addr = eth_validate_addr, | |
ed8cf436 SH |
277 | }; |
278 | ||
1da177e4 LT |
279 | /* Entry point of PLIP driver. |
280 | Probe the hardware, and register/initialize the driver. | |
281 | ||
282 | PLIP is rather weird, because of the way it interacts with the parport | |
283 | system. It is _not_ initialised from Space.c. Instead, plip_init() | |
284 | is called, and that function makes up a "struct net_device" for each port, and | |
285 | then calls us here. | |
286 | ||
287 | */ | |
288 | static void | |
289 | plip_init_netdev(struct net_device *dev) | |
290 | { | |
291 | struct net_local *nl = netdev_priv(dev); | |
292 | ||
293 | /* Then, override parts of it */ | |
1da177e4 LT |
294 | dev->tx_queue_len = 10; |
295 | dev->flags = IFF_POINTOPOINT|IFF_NOARP; | |
296 | memset(dev->dev_addr, 0xfc, ETH_ALEN); | |
297 | ||
ed8cf436 | 298 | dev->netdev_ops = &plip_netdev_ops; |
3b04ddde | 299 | dev->header_ops = &plip_header_ops; |
1da177e4 LT |
300 | |
301 | ||
302 | nl->port_owner = 0; | |
303 | ||
304 | /* Initialize constants */ | |
305 | nl->trigger = PLIP_TRIGGER_WAIT; | |
306 | nl->nibble = PLIP_NIBBLE_WAIT; | |
307 | ||
308 | /* Initialize task queue structures */ | |
c4028958 DH |
309 | INIT_WORK(&nl->immediate, plip_bh); |
310 | INIT_DELAYED_WORK(&nl->deferred, plip_kick_bh); | |
1da177e4 LT |
311 | |
312 | if (dev->irq == -1) | |
c4028958 | 313 | INIT_DELAYED_WORK(&nl->timer, plip_timer_bh); |
1da177e4 LT |
314 | |
315 | spin_lock_init(&nl->lock); | |
316 | } | |
77933d72 | 317 | |
1da177e4 LT |
318 | /* Bottom half handler for the delayed request. |
319 | This routine is kicked by do_timer(). | |
320 | Request `plip_bh' to be invoked. */ | |
321 | static void | |
c4028958 | 322 | plip_kick_bh(struct work_struct *work) |
1da177e4 | 323 | { |
c4028958 DH |
324 | struct net_local *nl = |
325 | container_of(work, struct net_local, deferred.work); | |
1da177e4 LT |
326 | |
327 | if (nl->is_deferred) | |
328 | schedule_work(&nl->immediate); | |
329 | } | |
330 | ||
331 | /* Forward declarations of internal routines */ | |
332 | static int plip_none(struct net_device *, struct net_local *, | |
333 | struct plip_local *, struct plip_local *); | |
334 | static int plip_receive_packet(struct net_device *, struct net_local *, | |
335 | struct plip_local *, struct plip_local *); | |
336 | static int plip_send_packet(struct net_device *, struct net_local *, | |
337 | struct plip_local *, struct plip_local *); | |
338 | static int plip_connection_close(struct net_device *, struct net_local *, | |
339 | struct plip_local *, struct plip_local *); | |
340 | static int plip_error(struct net_device *, struct net_local *, | |
341 | struct plip_local *, struct plip_local *); | |
342 | static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, | |
343 | struct plip_local *snd, | |
344 | struct plip_local *rcv, | |
345 | int error); | |
346 | ||
347 | #define OK 0 | |
348 | #define TIMEOUT 1 | |
349 | #define ERROR 2 | |
350 | #define HS_TIMEOUT 3 | |
351 | ||
352 | typedef int (*plip_func)(struct net_device *dev, struct net_local *nl, | |
353 | struct plip_local *snd, struct plip_local *rcv); | |
354 | ||
f71e1309 | 355 | static const plip_func connection_state_table[] = |
1da177e4 LT |
356 | { |
357 | plip_none, | |
358 | plip_receive_packet, | |
359 | plip_send_packet, | |
360 | plip_connection_close, | |
361 | plip_error | |
362 | }; | |
363 | ||
364 | /* Bottom half handler of PLIP. */ | |
365 | static void | |
c4028958 | 366 | plip_bh(struct work_struct *work) |
1da177e4 | 367 | { |
c4028958 | 368 | struct net_local *nl = container_of(work, struct net_local, immediate); |
1da177e4 LT |
369 | struct plip_local *snd = &nl->snd_data; |
370 | struct plip_local *rcv = &nl->rcv_data; | |
371 | plip_func f; | |
372 | int r; | |
373 | ||
374 | nl->is_deferred = 0; | |
375 | f = connection_state_table[nl->connection]; | |
8e95a202 JP |
376 | if ((r = (*f)(nl->dev, nl, snd, rcv)) != OK && |
377 | (r = plip_bh_timeout_error(nl->dev, nl, snd, rcv, r)) != OK) { | |
1da177e4 LT |
378 | nl->is_deferred = 1; |
379 | schedule_delayed_work(&nl->deferred, 1); | |
380 | } | |
381 | } | |
382 | ||
383 | static void | |
c4028958 | 384 | plip_timer_bh(struct work_struct *work) |
1da177e4 | 385 | { |
c4028958 DH |
386 | struct net_local *nl = |
387 | container_of(work, struct net_local, timer.work); | |
6aa20a22 | 388 | |
1da177e4 | 389 | if (!(atomic_read (&nl->kill_timer))) { |
5712cb3d | 390 | plip_interrupt (nl->dev); |
1da177e4 LT |
391 | |
392 | schedule_delayed_work(&nl->timer, 1); | |
393 | } | |
394 | else { | |
01f31ac8 | 395 | complete(&nl->killed_timer_cmp); |
1da177e4 LT |
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++; | |
8e95a202 JP |
420 | if ((error == HS_TIMEOUT && nl->timeout_count <= 10) || |
421 | nl->timeout_count <= 3) { | |
1da177e4 LT |
422 | spin_unlock_irq(&nl->lock); |
423 | /* Try again later */ | |
424 | return TIMEOUT; | |
425 | } | |
426 | c0 = read_status(dev); | |
427 | printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n", | |
428 | dev->name, snd->state, c0); | |
429 | } else | |
430 | error = HS_TIMEOUT; | |
09f75cd7 JG |
431 | dev->stats.tx_errors++; |
432 | dev->stats.tx_aborted_errors++; | |
1da177e4 LT |
433 | } else if (nl->connection == PLIP_CN_RECEIVE) { |
434 | if (rcv->state == PLIP_PK_TRIGGER) { | |
435 | /* Transmission was interrupted. */ | |
436 | spin_unlock_irq(&nl->lock); | |
437 | return OK; | |
438 | } | |
439 | if (error != ERROR) { /* Timeout */ | |
440 | if (++nl->timeout_count <= 3) { | |
441 | spin_unlock_irq(&nl->lock); | |
442 | /* Try again later */ | |
443 | return TIMEOUT; | |
444 | } | |
445 | c0 = read_status(dev); | |
446 | printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n", | |
447 | dev->name, rcv->state, c0); | |
448 | } | |
09f75cd7 | 449 | dev->stats.rx_dropped++; |
1da177e4 LT |
450 | } |
451 | rcv->state = PLIP_PK_DONE; | |
452 | if (rcv->skb) { | |
453 | kfree_skb(rcv->skb); | |
454 | rcv->skb = NULL; | |
455 | } | |
456 | snd->state = PLIP_PK_DONE; | |
457 | if (snd->skb) { | |
458 | dev_kfree_skb(snd->skb); | |
459 | snd->skb = NULL; | |
460 | } | |
461 | spin_unlock_irq(&nl->lock); | |
462 | if (error == HS_TIMEOUT) { | |
463 | DISABLE(dev->irq); | |
464 | synchronize_irq(dev->irq); | |
465 | } | |
466 | disable_parport_interrupts (dev); | |
467 | netif_stop_queue (dev); | |
468 | nl->connection = PLIP_CN_ERROR; | |
469 | write_data (dev, 0x00); | |
470 | ||
471 | return TIMEOUT; | |
472 | } | |
77933d72 | 473 | |
1da177e4 LT |
474 | static int |
475 | plip_none(struct net_device *dev, struct net_local *nl, | |
476 | struct plip_local *snd, struct plip_local *rcv) | |
477 | { | |
478 | return OK; | |
479 | } | |
480 | ||
481 | /* PLIP_RECEIVE --- receive a byte(two nibbles) | |
482 | Returns OK on success, TIMEOUT on timeout */ | |
77933d72 | 483 | static inline int |
1da177e4 LT |
484 | plip_receive(unsigned short nibble_timeout, struct net_device *dev, |
485 | enum plip_nibble_state *ns_p, unsigned char *data_p) | |
486 | { | |
487 | unsigned char c0, c1; | |
488 | unsigned int cx; | |
489 | ||
490 | switch (*ns_p) { | |
491 | case PLIP_NB_BEGIN: | |
492 | cx = nibble_timeout; | |
493 | while (1) { | |
494 | c0 = read_status(dev); | |
495 | udelay(PLIP_DELAY_UNIT); | |
496 | if ((c0 & 0x80) == 0) { | |
497 | c1 = read_status(dev); | |
498 | if (c0 == c1) | |
499 | break; | |
500 | } | |
501 | if (--cx == 0) | |
502 | return TIMEOUT; | |
503 | } | |
504 | *data_p = (c0 >> 3) & 0x0f; | |
505 | write_data (dev, 0x10); /* send ACK */ | |
506 | *ns_p = PLIP_NB_1; | |
507 | ||
508 | case PLIP_NB_1: | |
509 | cx = nibble_timeout; | |
510 | while (1) { | |
511 | c0 = read_status(dev); | |
512 | udelay(PLIP_DELAY_UNIT); | |
513 | if (c0 & 0x80) { | |
514 | c1 = read_status(dev); | |
515 | if (c0 == c1) | |
516 | break; | |
517 | } | |
518 | if (--cx == 0) | |
519 | return TIMEOUT; | |
520 | } | |
521 | *data_p |= (c0 << 1) & 0xf0; | |
522 | write_data (dev, 0x00); /* send ACK */ | |
523 | *ns_p = PLIP_NB_BEGIN; | |
524 | case PLIP_NB_2: | |
525 | break; | |
526 | } | |
527 | return OK; | |
528 | } | |
529 | ||
530 | /* | |
6aa20a22 | 531 | * Determine the packet's protocol ID. The rule here is that we |
1da177e4 LT |
532 | * assume 802.3 if the type field is short enough to be a length. |
533 | * This is normal practice and works for any 'now in use' protocol. | |
534 | * | |
535 | * PLIP is ethernet ish but the daddr might not be valid if unicast. | |
536 | * PLIP fortunately has no bus architecture (its Point-to-point). | |
537 | * | |
538 | * We can't fix the daddr thing as that quirk (more bug) is embedded | |
539 | * in far too many old systems not all even running Linux. | |
540 | */ | |
6aa20a22 | 541 | |
ab611487 | 542 | static __be16 plip_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
543 | { |
544 | struct ethhdr *eth; | |
545 | unsigned char *rawp; | |
6aa20a22 | 546 | |
98e399f8 | 547 | skb_reset_mac_header(skb); |
1da177e4 LT |
548 | skb_pull(skb,dev->hard_header_len); |
549 | eth = eth_hdr(skb); | |
6aa20a22 | 550 | |
1da177e4 LT |
551 | if(*eth->h_dest&1) |
552 | { | |
553 | if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0) | |
554 | skb->pkt_type=PACKET_BROADCAST; | |
555 | else | |
556 | skb->pkt_type=PACKET_MULTICAST; | |
557 | } | |
6aa20a22 | 558 | |
1da177e4 LT |
559 | /* |
560 | * This ALLMULTI check should be redundant by 1.4 | |
561 | * so don't forget to remove it. | |
562 | */ | |
6aa20a22 | 563 | |
1da177e4 LT |
564 | if (ntohs(eth->h_proto) >= 1536) |
565 | return eth->h_proto; | |
6aa20a22 | 566 | |
1da177e4 | 567 | rawp = skb->data; |
6aa20a22 | 568 | |
1da177e4 LT |
569 | /* |
570 | * This is a magic hack to spot IPX packets. Older Novell breaks | |
571 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
572 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
573 | * won't work for fault tolerant netware but does for the rest. | |
574 | */ | |
575 | if (*(unsigned short *)rawp == 0xFFFF) | |
576 | return htons(ETH_P_802_3); | |
6aa20a22 | 577 | |
1da177e4 LT |
578 | /* |
579 | * Real 802.2 LLC | |
580 | */ | |
581 | return htons(ETH_P_802_2); | |
582 | } | |
583 | ||
1da177e4 LT |
584 | /* PLIP_RECEIVE_PACKET --- receive a packet */ |
585 | static int | |
586 | plip_receive_packet(struct net_device *dev, struct net_local *nl, | |
587 | struct plip_local *snd, struct plip_local *rcv) | |
588 | { | |
589 | unsigned short nibble_timeout = nl->nibble; | |
590 | unsigned char *lbuf; | |
591 | ||
592 | switch (rcv->state) { | |
593 | case PLIP_PK_TRIGGER: | |
594 | DISABLE(dev->irq); | |
595 | /* Don't need to synchronize irq, as we can safely ignore it */ | |
596 | disable_parport_interrupts (dev); | |
597 | write_data (dev, 0x01); /* send ACK */ | |
598 | if (net_debug > 2) | |
599 | printk(KERN_DEBUG "%s: receive start\n", dev->name); | |
600 | rcv->state = PLIP_PK_LENGTH_LSB; | |
601 | rcv->nibble = PLIP_NB_BEGIN; | |
602 | ||
603 | case PLIP_PK_LENGTH_LSB: | |
604 | if (snd->state != PLIP_PK_DONE) { | |
605 | if (plip_receive(nl->trigger, dev, | |
606 | &rcv->nibble, &rcv->length.b.lsb)) { | |
607 | /* collision, here dev->tbusy == 1 */ | |
608 | rcv->state = PLIP_PK_DONE; | |
609 | nl->is_deferred = 1; | |
610 | nl->connection = PLIP_CN_SEND; | |
611 | schedule_delayed_work(&nl->deferred, 1); | |
612 | enable_parport_interrupts (dev); | |
613 | ENABLE(dev->irq); | |
614 | return OK; | |
615 | } | |
616 | } else { | |
617 | if (plip_receive(nibble_timeout, dev, | |
618 | &rcv->nibble, &rcv->length.b.lsb)) | |
619 | return TIMEOUT; | |
620 | } | |
621 | rcv->state = PLIP_PK_LENGTH_MSB; | |
622 | ||
623 | case PLIP_PK_LENGTH_MSB: | |
624 | if (plip_receive(nibble_timeout, dev, | |
625 | &rcv->nibble, &rcv->length.b.msb)) | |
626 | return TIMEOUT; | |
8e95a202 JP |
627 | if (rcv->length.h > dev->mtu + dev->hard_header_len || |
628 | rcv->length.h < 8) { | |
1da177e4 LT |
629 | printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h); |
630 | return ERROR; | |
631 | } | |
632 | /* Malloc up new buffer. */ | |
633 | rcv->skb = dev_alloc_skb(rcv->length.h + 2); | |
634 | if (rcv->skb == NULL) { | |
635 | printk(KERN_ERR "%s: Memory squeeze.\n", dev->name); | |
636 | return ERROR; | |
637 | } | |
638 | skb_reserve(rcv->skb, 2); /* Align IP on 16 byte boundaries */ | |
639 | skb_put(rcv->skb,rcv->length.h); | |
640 | rcv->skb->dev = dev; | |
641 | rcv->state = PLIP_PK_DATA; | |
642 | rcv->byte = 0; | |
643 | rcv->checksum = 0; | |
644 | ||
645 | case PLIP_PK_DATA: | |
646 | lbuf = rcv->skb->data; | |
e4c3c13c | 647 | do { |
1da177e4 LT |
648 | if (plip_receive(nibble_timeout, dev, |
649 | &rcv->nibble, &lbuf[rcv->byte])) | |
650 | return TIMEOUT; | |
e4c3c13c HE |
651 | } while (++rcv->byte < rcv->length.h); |
652 | do { | |
1da177e4 | 653 | rcv->checksum += lbuf[--rcv->byte]; |
e4c3c13c | 654 | } while (rcv->byte); |
1da177e4 LT |
655 | rcv->state = PLIP_PK_CHECKSUM; |
656 | ||
657 | case PLIP_PK_CHECKSUM: | |
658 | if (plip_receive(nibble_timeout, dev, | |
659 | &rcv->nibble, &rcv->data)) | |
660 | return TIMEOUT; | |
661 | if (rcv->data != rcv->checksum) { | |
09f75cd7 | 662 | dev->stats.rx_crc_errors++; |
1da177e4 LT |
663 | if (net_debug) |
664 | printk(KERN_DEBUG "%s: checksum error\n", dev->name); | |
665 | return ERROR; | |
666 | } | |
667 | rcv->state = PLIP_PK_DONE; | |
668 | ||
669 | case PLIP_PK_DONE: | |
670 | /* Inform the upper layer for the arrival of a packet. */ | |
671 | rcv->skb->protocol=plip_type_trans(rcv->skb, dev); | |
f6ce5cca | 672 | netif_rx_ni(rcv->skb); |
09f75cd7 JG |
673 | dev->stats.rx_bytes += rcv->length.h; |
674 | dev->stats.rx_packets++; | |
1da177e4 LT |
675 | rcv->skb = NULL; |
676 | if (net_debug > 2) | |
677 | printk(KERN_DEBUG "%s: receive end\n", dev->name); | |
678 | ||
679 | /* Close the connection. */ | |
680 | write_data (dev, 0x00); | |
681 | spin_lock_irq(&nl->lock); | |
682 | if (snd->state != PLIP_PK_DONE) { | |
683 | nl->connection = PLIP_CN_SEND; | |
684 | spin_unlock_irq(&nl->lock); | |
685 | schedule_work(&nl->immediate); | |
686 | enable_parport_interrupts (dev); | |
687 | ENABLE(dev->irq); | |
688 | return OK; | |
689 | } else { | |
690 | nl->connection = PLIP_CN_NONE; | |
691 | spin_unlock_irq(&nl->lock); | |
692 | enable_parport_interrupts (dev); | |
693 | ENABLE(dev->irq); | |
694 | return OK; | |
695 | } | |
696 | } | |
697 | return OK; | |
698 | } | |
699 | ||
700 | /* PLIP_SEND --- send a byte (two nibbles) | |
701 | Returns OK on success, TIMEOUT when timeout */ | |
77933d72 | 702 | static inline int |
1da177e4 LT |
703 | plip_send(unsigned short nibble_timeout, struct net_device *dev, |
704 | enum plip_nibble_state *ns_p, unsigned char data) | |
705 | { | |
706 | unsigned char c0; | |
707 | unsigned int cx; | |
708 | ||
709 | switch (*ns_p) { | |
710 | case PLIP_NB_BEGIN: | |
711 | write_data (dev, data & 0x0f); | |
712 | *ns_p = PLIP_NB_1; | |
713 | ||
714 | case PLIP_NB_1: | |
715 | write_data (dev, 0x10 | (data & 0x0f)); | |
716 | cx = nibble_timeout; | |
717 | while (1) { | |
718 | c0 = read_status(dev); | |
719 | if ((c0 & 0x80) == 0) | |
720 | break; | |
721 | if (--cx == 0) | |
722 | return TIMEOUT; | |
723 | udelay(PLIP_DELAY_UNIT); | |
724 | } | |
725 | write_data (dev, 0x10 | (data >> 4)); | |
726 | *ns_p = PLIP_NB_2; | |
727 | ||
728 | case PLIP_NB_2: | |
729 | write_data (dev, (data >> 4)); | |
730 | cx = nibble_timeout; | |
731 | while (1) { | |
732 | c0 = read_status(dev); | |
733 | if (c0 & 0x80) | |
734 | break; | |
735 | if (--cx == 0) | |
736 | return TIMEOUT; | |
737 | udelay(PLIP_DELAY_UNIT); | |
738 | } | |
739 | *ns_p = PLIP_NB_BEGIN; | |
740 | return OK; | |
741 | } | |
742 | return OK; | |
743 | } | |
744 | ||
745 | /* PLIP_SEND_PACKET --- send a packet */ | |
746 | static int | |
747 | plip_send_packet(struct net_device *dev, struct net_local *nl, | |
748 | struct plip_local *snd, struct plip_local *rcv) | |
749 | { | |
750 | unsigned short nibble_timeout = nl->nibble; | |
751 | unsigned char *lbuf; | |
752 | unsigned char c0; | |
753 | unsigned int cx; | |
754 | ||
755 | if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) { | |
756 | printk(KERN_DEBUG "%s: send skb lost\n", dev->name); | |
757 | snd->state = PLIP_PK_DONE; | |
758 | snd->skb = NULL; | |
759 | return ERROR; | |
760 | } | |
761 | ||
762 | switch (snd->state) { | |
763 | case PLIP_PK_TRIGGER: | |
764 | if ((read_status(dev) & 0xf8) != 0x80) | |
765 | return HS_TIMEOUT; | |
766 | ||
767 | /* Trigger remote rx interrupt. */ | |
768 | write_data (dev, 0x08); | |
769 | cx = nl->trigger; | |
770 | while (1) { | |
771 | udelay(PLIP_DELAY_UNIT); | |
772 | spin_lock_irq(&nl->lock); | |
773 | if (nl->connection == PLIP_CN_RECEIVE) { | |
774 | spin_unlock_irq(&nl->lock); | |
775 | /* Interrupted. */ | |
09f75cd7 | 776 | dev->stats.collisions++; |
1da177e4 LT |
777 | return OK; |
778 | } | |
779 | c0 = read_status(dev); | |
780 | if (c0 & 0x08) { | |
781 | spin_unlock_irq(&nl->lock); | |
782 | DISABLE(dev->irq); | |
783 | synchronize_irq(dev->irq); | |
784 | if (nl->connection == PLIP_CN_RECEIVE) { | |
785 | /* Interrupted. | |
786 | We don't need to enable irq, | |
787 | as it is soon disabled. */ | |
788 | /* Yes, we do. New variant of | |
789 | {enable,disable}_irq *counts* | |
790 | them. -- AV */ | |
791 | ENABLE(dev->irq); | |
09f75cd7 | 792 | dev->stats.collisions++; |
1da177e4 LT |
793 | return OK; |
794 | } | |
795 | disable_parport_interrupts (dev); | |
796 | if (net_debug > 2) | |
797 | printk(KERN_DEBUG "%s: send start\n", dev->name); | |
798 | snd->state = PLIP_PK_LENGTH_LSB; | |
799 | snd->nibble = PLIP_NB_BEGIN; | |
800 | nl->timeout_count = 0; | |
801 | break; | |
802 | } | |
803 | spin_unlock_irq(&nl->lock); | |
804 | if (--cx == 0) { | |
805 | write_data (dev, 0x00); | |
806 | return HS_TIMEOUT; | |
807 | } | |
808 | } | |
809 | ||
810 | case PLIP_PK_LENGTH_LSB: | |
811 | if (plip_send(nibble_timeout, dev, | |
812 | &snd->nibble, snd->length.b.lsb)) | |
813 | return TIMEOUT; | |
814 | snd->state = PLIP_PK_LENGTH_MSB; | |
815 | ||
816 | case PLIP_PK_LENGTH_MSB: | |
817 | if (plip_send(nibble_timeout, dev, | |
818 | &snd->nibble, snd->length.b.msb)) | |
819 | return TIMEOUT; | |
820 | snd->state = PLIP_PK_DATA; | |
821 | snd->byte = 0; | |
822 | snd->checksum = 0; | |
823 | ||
824 | case PLIP_PK_DATA: | |
e4c3c13c | 825 | do { |
1da177e4 LT |
826 | if (plip_send(nibble_timeout, dev, |
827 | &snd->nibble, lbuf[snd->byte])) | |
828 | return TIMEOUT; | |
e4c3c13c HE |
829 | } while (++snd->byte < snd->length.h); |
830 | do { | |
1da177e4 | 831 | snd->checksum += lbuf[--snd->byte]; |
e4c3c13c | 832 | } while (snd->byte); |
1da177e4 LT |
833 | snd->state = PLIP_PK_CHECKSUM; |
834 | ||
835 | case PLIP_PK_CHECKSUM: | |
836 | if (plip_send(nibble_timeout, dev, | |
837 | &snd->nibble, snd->checksum)) | |
838 | return TIMEOUT; | |
839 | ||
09f75cd7 | 840 | dev->stats.tx_bytes += snd->skb->len; |
1da177e4 | 841 | dev_kfree_skb(snd->skb); |
09f75cd7 | 842 | dev->stats.tx_packets++; |
1da177e4 LT |
843 | snd->state = PLIP_PK_DONE; |
844 | ||
845 | case PLIP_PK_DONE: | |
846 | /* Close the connection */ | |
847 | write_data (dev, 0x00); | |
848 | snd->skb = NULL; | |
849 | if (net_debug > 2) | |
850 | printk(KERN_DEBUG "%s: send end\n", dev->name); | |
851 | nl->connection = PLIP_CN_CLOSING; | |
852 | nl->is_deferred = 1; | |
853 | schedule_delayed_work(&nl->deferred, 1); | |
854 | enable_parport_interrupts (dev); | |
855 | ENABLE(dev->irq); | |
856 | return OK; | |
857 | } | |
858 | return OK; | |
859 | } | |
860 | ||
861 | static int | |
862 | plip_connection_close(struct net_device *dev, struct net_local *nl, | |
863 | struct plip_local *snd, struct plip_local *rcv) | |
864 | { | |
865 | spin_lock_irq(&nl->lock); | |
866 | if (nl->connection == PLIP_CN_CLOSING) { | |
867 | nl->connection = PLIP_CN_NONE; | |
868 | netif_wake_queue (dev); | |
869 | } | |
870 | spin_unlock_irq(&nl->lock); | |
871 | if (nl->should_relinquish) { | |
872 | nl->should_relinquish = nl->port_owner = 0; | |
873 | parport_release(nl->pardev); | |
874 | } | |
875 | return OK; | |
876 | } | |
877 | ||
878 | /* PLIP_ERROR --- wait till other end settled */ | |
879 | static int | |
880 | plip_error(struct net_device *dev, struct net_local *nl, | |
881 | struct plip_local *snd, struct plip_local *rcv) | |
882 | { | |
883 | unsigned char status; | |
884 | ||
885 | status = read_status(dev); | |
886 | if ((status & 0xf8) == 0x80) { | |
887 | if (net_debug > 2) | |
888 | printk(KERN_DEBUG "%s: reset interface.\n", dev->name); | |
889 | nl->connection = PLIP_CN_NONE; | |
890 | nl->should_relinquish = 0; | |
891 | netif_start_queue (dev); | |
892 | enable_parport_interrupts (dev); | |
893 | ENABLE(dev->irq); | |
894 | netif_wake_queue (dev); | |
895 | } else { | |
896 | nl->is_deferred = 1; | |
897 | schedule_delayed_work(&nl->deferred, 1); | |
898 | } | |
899 | ||
900 | return OK; | |
901 | } | |
77933d72 | 902 | |
1da177e4 LT |
903 | /* Handle the parallel port interrupts. */ |
904 | static void | |
5712cb3d | 905 | plip_interrupt(void *dev_id) |
1da177e4 LT |
906 | { |
907 | struct net_device *dev = dev_id; | |
908 | struct net_local *nl; | |
909 | struct plip_local *rcv; | |
910 | unsigned char c0; | |
cabce28e | 911 | unsigned long flags; |
1da177e4 | 912 | |
1da177e4 LT |
913 | nl = netdev_priv(dev); |
914 | rcv = &nl->rcv_data; | |
915 | ||
cabce28e | 916 | spin_lock_irqsave (&nl->lock, flags); |
1da177e4 LT |
917 | |
918 | c0 = read_status(dev); | |
919 | if ((c0 & 0xf8) != 0xc0) { | |
920 | if ((dev->irq != -1) && (net_debug > 1)) | |
921 | printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name); | |
cabce28e | 922 | spin_unlock_irqrestore (&nl->lock, flags); |
1da177e4 LT |
923 | return; |
924 | } | |
925 | ||
926 | if (net_debug > 3) | |
927 | printk(KERN_DEBUG "%s: interrupt.\n", dev->name); | |
928 | ||
929 | switch (nl->connection) { | |
930 | case PLIP_CN_CLOSING: | |
931 | netif_wake_queue (dev); | |
932 | case PLIP_CN_NONE: | |
933 | case PLIP_CN_SEND: | |
934 | rcv->state = PLIP_PK_TRIGGER; | |
935 | nl->connection = PLIP_CN_RECEIVE; | |
936 | nl->timeout_count = 0; | |
937 | schedule_work(&nl->immediate); | |
938 | break; | |
939 | ||
940 | case PLIP_CN_RECEIVE: | |
941 | /* May occur because there is race condition | |
942 | around test and set of dev->interrupt. | |
943 | Ignore this interrupt. */ | |
944 | break; | |
945 | ||
946 | case PLIP_CN_ERROR: | |
947 | printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name); | |
948 | break; | |
949 | } | |
950 | ||
cabce28e | 951 | spin_unlock_irqrestore(&nl->lock, flags); |
1da177e4 | 952 | } |
77933d72 | 953 | |
1da177e4 LT |
954 | static int |
955 | plip_tx_packet(struct sk_buff *skb, struct net_device *dev) | |
956 | { | |
957 | struct net_local *nl = netdev_priv(dev); | |
958 | struct plip_local *snd = &nl->snd_data; | |
959 | ||
960 | if (netif_queue_stopped(dev)) | |
5b548140 | 961 | return NETDEV_TX_BUSY; |
1da177e4 LT |
962 | |
963 | /* We may need to grab the bus */ | |
964 | if (!nl->port_owner) { | |
965 | if (parport_claim(nl->pardev)) | |
5b548140 | 966 | return NETDEV_TX_BUSY; |
1da177e4 LT |
967 | nl->port_owner = 1; |
968 | } | |
969 | ||
970 | netif_stop_queue (dev); | |
6aa20a22 | 971 | |
1da177e4 LT |
972 | if (skb->len > dev->mtu + dev->hard_header_len) { |
973 | printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len); | |
974 | netif_start_queue (dev); | |
5b548140 | 975 | return NETDEV_TX_BUSY; |
1da177e4 LT |
976 | } |
977 | ||
978 | if (net_debug > 2) | |
979 | printk(KERN_DEBUG "%s: send request\n", dev->name); | |
980 | ||
981 | spin_lock_irq(&nl->lock); | |
1da177e4 LT |
982 | snd->skb = skb; |
983 | snd->length.h = skb->len; | |
984 | snd->state = PLIP_PK_TRIGGER; | |
985 | if (nl->connection == PLIP_CN_NONE) { | |
986 | nl->connection = PLIP_CN_SEND; | |
987 | nl->timeout_count = 0; | |
988 | } | |
989 | schedule_work(&nl->immediate); | |
990 | spin_unlock_irq(&nl->lock); | |
6aa20a22 | 991 | |
6ed10654 | 992 | return NETDEV_TX_OK; |
1da177e4 LT |
993 | } |
994 | ||
995 | static void | |
3b04ddde | 996 | plip_rewrite_address(const struct net_device *dev, struct ethhdr *eth) |
1da177e4 | 997 | { |
3b04ddde | 998 | const struct in_device *in_dev = dev->ip_ptr; |
1da177e4 | 999 | |
3b04ddde | 1000 | if (in_dev) { |
1da177e4 | 1001 | /* Any address will do - we take the first */ |
3b04ddde SH |
1002 | const struct in_ifaddr *ifa = in_dev->ifa_list; |
1003 | if (ifa) { | |
1da177e4 LT |
1004 | memcpy(eth->h_source, dev->dev_addr, 6); |
1005 | memset(eth->h_dest, 0xfc, 2); | |
1006 | memcpy(eth->h_dest+2, &ifa->ifa_address, 4); | |
1007 | } | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | static int | |
1012 | plip_hard_header(struct sk_buff *skb, struct net_device *dev, | |
3b04ddde SH |
1013 | unsigned short type, const void *daddr, |
1014 | const void *saddr, unsigned len) | |
1da177e4 | 1015 | { |
1da177e4 LT |
1016 | int ret; |
1017 | ||
3b04ddde SH |
1018 | ret = eth_header(skb, dev, type, daddr, saddr, len); |
1019 | if (ret >= 0) | |
1da177e4 LT |
1020 | plip_rewrite_address (dev, (struct ethhdr *)skb->data); |
1021 | ||
1022 | return ret; | |
1023 | } | |
1024 | ||
dac499f9 HE |
1025 | static int plip_hard_header_cache(const struct neighbour *neigh, |
1026 | struct hh_cache *hh) | |
1da177e4 | 1027 | { |
1da177e4 | 1028 | int ret; |
6aa20a22 | 1029 | |
3b04ddde SH |
1030 | ret = eth_header_cache(neigh, hh); |
1031 | if (ret == 0) { | |
1da177e4 LT |
1032 | struct ethhdr *eth; |
1033 | ||
1034 | eth = (struct ethhdr*)(((u8*)hh->hh_data) + | |
1035 | HH_DATA_OFF(sizeof(*eth))); | |
1036 | plip_rewrite_address (neigh->dev, eth); | |
1037 | } | |
6aa20a22 | 1038 | |
1da177e4 | 1039 | return ret; |
6aa20a22 | 1040 | } |
1da177e4 LT |
1041 | |
1042 | /* Open/initialize the board. This is called (in the current kernel) | |
1043 | sometime after booting when the 'ifconfig' program is run. | |
1044 | ||
1045 | This routine gets exclusive access to the parallel port by allocating | |
1046 | its IRQ line. | |
1047 | */ | |
1048 | static int | |
1049 | plip_open(struct net_device *dev) | |
1050 | { | |
1051 | struct net_local *nl = netdev_priv(dev); | |
1052 | struct in_device *in_dev; | |
1053 | ||
1054 | /* Grab the port */ | |
1055 | if (!nl->port_owner) { | |
1056 | if (parport_claim(nl->pardev)) return -EAGAIN; | |
1057 | nl->port_owner = 1; | |
1058 | } | |
1059 | ||
1060 | nl->should_relinquish = 0; | |
1061 | ||
1062 | /* Clear the data port. */ | |
1063 | write_data (dev, 0x00); | |
1064 | ||
1065 | /* Enable rx interrupt. */ | |
1066 | enable_parport_interrupts (dev); | |
1067 | if (dev->irq == -1) | |
1068 | { | |
1069 | atomic_set (&nl->kill_timer, 0); | |
1070 | schedule_delayed_work(&nl->timer, 1); | |
1071 | } | |
1072 | ||
1073 | /* Initialize the state machine. */ | |
1074 | nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE; | |
1075 | nl->rcv_data.skb = nl->snd_data.skb = NULL; | |
1076 | nl->connection = PLIP_CN_NONE; | |
1077 | nl->is_deferred = 0; | |
1078 | ||
1079 | /* Fill in the MAC-level header. | |
1080 | We used to abuse dev->broadcast to store the point-to-point | |
1081 | MAC address, but we no longer do it. Instead, we fetch the | |
1082 | interface address whenever it is needed, which is cheap enough | |
1083 | because we use the hh_cache. Actually, abusing dev->broadcast | |
1084 | didn't work, because when using plip_open the point-to-point | |
1085 | address isn't yet known. | |
1086 | PLIP doesn't have a real MAC address, but we need it to be | |
1087 | DOS compatible, and to properly support taps (otherwise, | |
1088 | when the device address isn't identical to the address of a | |
1089 | received frame, the kernel incorrectly drops it). */ | |
1090 | ||
1091 | if ((in_dev=dev->ip_ptr) != NULL) { | |
1092 | /* Any address will do - we take the first. We already | |
1093 | have the first two bytes filled with 0xfc, from | |
1094 | plip_init_dev(). */ | |
1095 | struct in_ifaddr *ifa=in_dev->ifa_list; | |
1096 | if (ifa != NULL) { | |
1097 | memcpy(dev->dev_addr+2, &ifa->ifa_local, 4); | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | netif_start_queue (dev); | |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | /* The inverse routine to plip_open (). */ | |
1107 | static int | |
1108 | plip_close(struct net_device *dev) | |
1109 | { | |
1110 | struct net_local *nl = netdev_priv(dev); | |
1111 | struct plip_local *snd = &nl->snd_data; | |
1112 | struct plip_local *rcv = &nl->rcv_data; | |
1113 | ||
1114 | netif_stop_queue (dev); | |
1115 | DISABLE(dev->irq); | |
1116 | synchronize_irq(dev->irq); | |
1117 | ||
1118 | if (dev->irq == -1) | |
1119 | { | |
01f31ac8 | 1120 | init_completion(&nl->killed_timer_cmp); |
1da177e4 | 1121 | atomic_set (&nl->kill_timer, 1); |
01f31ac8 | 1122 | wait_for_completion(&nl->killed_timer_cmp); |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | #ifdef NOTDEF | |
1126 | outb(0x00, PAR_DATA(dev)); | |
1127 | #endif | |
1128 | nl->is_deferred = 0; | |
1129 | nl->connection = PLIP_CN_NONE; | |
1130 | if (nl->port_owner) { | |
1131 | parport_release(nl->pardev); | |
1132 | nl->port_owner = 0; | |
1133 | } | |
1134 | ||
1135 | snd->state = PLIP_PK_DONE; | |
1136 | if (snd->skb) { | |
1137 | dev_kfree_skb(snd->skb); | |
1138 | snd->skb = NULL; | |
1139 | } | |
1140 | rcv->state = PLIP_PK_DONE; | |
1141 | if (rcv->skb) { | |
1142 | kfree_skb(rcv->skb); | |
1143 | rcv->skb = NULL; | |
1144 | } | |
1145 | ||
1146 | #ifdef NOTDEF | |
1147 | /* Reset. */ | |
1148 | outb(0x00, PAR_CONTROL(dev)); | |
1149 | #endif | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int | |
1154 | plip_preempt(void *handle) | |
1155 | { | |
1156 | struct net_device *dev = (struct net_device *)handle; | |
1157 | struct net_local *nl = netdev_priv(dev); | |
1158 | ||
1159 | /* Stand our ground if a datagram is on the wire */ | |
1160 | if (nl->connection != PLIP_CN_NONE) { | |
1161 | nl->should_relinquish = 1; | |
1162 | return 1; | |
1163 | } | |
1164 | ||
1165 | nl->port_owner = 0; /* Remember that we released the bus */ | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | static void | |
1170 | plip_wakeup(void *handle) | |
1171 | { | |
1172 | struct net_device *dev = (struct net_device *)handle; | |
1173 | struct net_local *nl = netdev_priv(dev); | |
1174 | ||
1175 | if (nl->port_owner) { | |
1176 | /* Why are we being woken up? */ | |
1177 | printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name); | |
1178 | if (!parport_claim(nl->pardev)) | |
1179 | /* bus_owner is already set (but why?) */ | |
1180 | printk(KERN_DEBUG "%s: I'm broken.\n", dev->name); | |
1181 | else | |
1182 | return; | |
1183 | } | |
6aa20a22 | 1184 | |
1da177e4 LT |
1185 | if (!(dev->flags & IFF_UP)) |
1186 | /* Don't need the port when the interface is down */ | |
1187 | return; | |
1188 | ||
1189 | if (!parport_claim(nl->pardev)) { | |
1190 | nl->port_owner = 1; | |
1191 | /* Clear the data port. */ | |
1192 | write_data (dev, 0x00); | |
1193 | } | |
1da177e4 LT |
1194 | } |
1195 | ||
1da177e4 LT |
1196 | static int |
1197 | plip_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
1198 | { | |
1199 | struct net_local *nl = netdev_priv(dev); | |
1200 | struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru; | |
1201 | ||
1202 | if (cmd != SIOCDEVPLIP) | |
1203 | return -EOPNOTSUPP; | |
1204 | ||
1205 | switch(pc->pcmd) { | |
1206 | case PLIP_GET_TIMEOUT: | |
1207 | pc->trigger = nl->trigger; | |
1208 | pc->nibble = nl->nibble; | |
1209 | break; | |
1210 | case PLIP_SET_TIMEOUT: | |
1211 | if(!capable(CAP_NET_ADMIN)) | |
1212 | return -EPERM; | |
1213 | nl->trigger = pc->trigger; | |
1214 | nl->nibble = pc->nibble; | |
1215 | break; | |
1216 | default: | |
1217 | return -EOPNOTSUPP; | |
1218 | } | |
1219 | return 0; | |
1220 | } | |
77933d72 | 1221 | |
1da177e4 LT |
1222 | static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 }; |
1223 | static int timid; | |
1224 | ||
1225 | module_param_array(parport, int, NULL, 0); | |
1226 | module_param(timid, int, 0); | |
1227 | MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip"); | |
1228 | ||
1229 | static struct net_device *dev_plip[PLIP_MAX] = { NULL, }; | |
1230 | ||
1231 | static inline int | |
1232 | plip_searchfor(int list[], int a) | |
1233 | { | |
1234 | int i; | |
1235 | for (i = 0; i < PLIP_MAX && list[i] != -1; i++) { | |
1236 | if (list[i] == a) return 1; | |
1237 | } | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | /* plip_attach() is called (by the parport code) when a port is | |
1242 | * available to use. */ | |
1243 | static void plip_attach (struct parport *port) | |
1244 | { | |
1245 | static int unit; | |
1246 | struct net_device *dev; | |
1247 | struct net_local *nl; | |
1248 | char name[IFNAMSIZ]; | |
1249 | ||
6aa20a22 | 1250 | if ((parport[0] == -1 && (!timid || !port->devices)) || |
1da177e4 LT |
1251 | plip_searchfor(parport, port->number)) { |
1252 | if (unit == PLIP_MAX) { | |
1253 | printk(KERN_ERR "plip: too many devices\n"); | |
1254 | return; | |
1255 | } | |
1256 | ||
1257 | sprintf(name, "plip%d", unit); | |
1258 | dev = alloc_etherdev(sizeof(struct net_local)); | |
1259 | if (!dev) { | |
1260 | printk(KERN_ERR "plip: memory squeeze\n"); | |
1261 | return; | |
1262 | } | |
6aa20a22 | 1263 | |
1da177e4 LT |
1264 | strcpy(dev->name, name); |
1265 | ||
1da177e4 LT |
1266 | dev->irq = port->irq; |
1267 | dev->base_addr = port->base; | |
1268 | if (port->irq == -1) { | |
1269 | printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode," | |
1270 | "which is fairly inefficient!\n", port->name); | |
1271 | } | |
1272 | ||
1273 | nl = netdev_priv(dev); | |
c4028958 | 1274 | nl->dev = dev; |
cdb32706 | 1275 | nl->pardev = parport_register_device(port, dev->name, plip_preempt, |
6aa20a22 | 1276 | plip_wakeup, plip_interrupt, |
1da177e4 LT |
1277 | 0, dev); |
1278 | ||
1279 | if (!nl->pardev) { | |
1280 | printk(KERN_ERR "%s: parport_register failed\n", name); | |
1281 | goto err_free_dev; | |
1282 | return; | |
1283 | } | |
1284 | ||
1285 | plip_init_netdev(dev); | |
1286 | ||
1287 | if (register_netdev(dev)) { | |
1288 | printk(KERN_ERR "%s: network register failed\n", name); | |
1289 | goto err_parport_unregister; | |
1290 | } | |
1291 | ||
1292 | printk(KERN_INFO "%s", version); | |
1293 | if (dev->irq != -1) | |
1294 | printk(KERN_INFO "%s: Parallel port at %#3lx, " | |
1295 | "using IRQ %d.\n", | |
1296 | dev->name, dev->base_addr, dev->irq); | |
1297 | else | |
1298 | printk(KERN_INFO "%s: Parallel port at %#3lx, " | |
1299 | "not using IRQ.\n", | |
1300 | dev->name, dev->base_addr); | |
1301 | dev_plip[unit++] = dev; | |
1302 | } | |
1303 | return; | |
1304 | ||
1305 | err_parport_unregister: | |
1306 | parport_unregister_device(nl->pardev); | |
1307 | err_free_dev: | |
1308 | free_netdev(dev); | |
1da177e4 LT |
1309 | } |
1310 | ||
1311 | /* plip_detach() is called (by the parport code) when a port is | |
1312 | * no longer available to use. */ | |
1313 | static void plip_detach (struct parport *port) | |
1314 | { | |
1315 | /* Nothing to do */ | |
1316 | } | |
1317 | ||
1318 | static struct parport_driver plip_driver = { | |
1319 | .name = "plip", | |
1320 | .attach = plip_attach, | |
1321 | .detach = plip_detach | |
1322 | }; | |
1323 | ||
1324 | static void __exit plip_cleanup_module (void) | |
1325 | { | |
1326 | struct net_device *dev; | |
1327 | int i; | |
1328 | ||
1329 | parport_unregister_driver (&plip_driver); | |
1330 | ||
1331 | for (i=0; i < PLIP_MAX; i++) { | |
1332 | if ((dev = dev_plip[i])) { | |
1333 | struct net_local *nl = netdev_priv(dev); | |
1334 | unregister_netdev(dev); | |
1335 | if (nl->port_owner) | |
1336 | parport_release(nl->pardev); | |
1337 | parport_unregister_device(nl->pardev); | |
1338 | free_netdev(dev); | |
1339 | dev_plip[i] = NULL; | |
1340 | } | |
1341 | } | |
1342 | } | |
1343 | ||
1344 | #ifndef MODULE | |
1345 | ||
1346 | static int parport_ptr; | |
1347 | ||
1348 | static int __init plip_setup(char *str) | |
1349 | { | |
1350 | int ints[4]; | |
1351 | ||
1352 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
1353 | ||
1354 | /* Ugh. */ | |
1355 | if (!strncmp(str, "parport", 7)) { | |
1356 | int n = simple_strtoul(str+7, NULL, 10); | |
1357 | if (parport_ptr < PLIP_MAX) | |
1358 | parport[parport_ptr++] = n; | |
1359 | else | |
1360 | printk(KERN_INFO "plip: too many ports, %s ignored.\n", | |
1361 | str); | |
1362 | } else if (!strcmp(str, "timid")) { | |
1363 | timid = 1; | |
1364 | } else { | |
1365 | if (ints[0] == 0 || ints[1] == 0) { | |
1366 | /* disable driver on "plip=" or "plip=0" */ | |
1367 | parport[0] = -2; | |
1368 | } else { | |
6aa20a22 | 1369 | printk(KERN_WARNING "warning: 'plip=0x%x' ignored\n", |
1da177e4 LT |
1370 | ints[1]); |
1371 | } | |
1372 | } | |
1373 | return 1; | |
1374 | } | |
1375 | ||
1376 | __setup("plip=", plip_setup); | |
1377 | ||
1378 | #endif /* !MODULE */ | |
1379 | ||
1380 | static int __init plip_init (void) | |
1381 | { | |
1382 | if (parport[0] == -2) | |
1383 | return 0; | |
1384 | ||
1385 | if (parport[0] != -1 && timid) { | |
1386 | printk(KERN_WARNING "plip: warning, ignoring `timid' since specific ports given.\n"); | |
1387 | timid = 0; | |
1388 | } | |
1389 | ||
1390 | if (parport_register_driver (&plip_driver)) { | |
1391 | printk (KERN_WARNING "plip: couldn't register driver\n"); | |
1392 | return 1; | |
1393 | } | |
1394 | ||
1395 | return 0; | |
1396 | } | |
1397 | ||
1398 | module_init(plip_init); | |
1399 | module_exit(plip_cleanup_module); | |
1400 | MODULE_LICENSE("GPL"); |