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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), | |
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 | ||
1da177e4 LT |
116 | #include <asm/irq.h> |
117 | #include <asm/byteorder.h> | |
1da177e4 LT |
118 | |
119 | /* Maximum number of devices to support. */ | |
120 | #define PLIP_MAX 8 | |
121 | ||
122 | /* Use 0 for production, 1 for verification, >2 for debug */ | |
123 | #ifndef NET_DEBUG | |
124 | #define NET_DEBUG 1 | |
125 | #endif | |
f71e1309 | 126 | static const unsigned int net_debug = NET_DEBUG; |
1da177e4 LT |
127 | |
128 | #define ENABLE(irq) if (irq != -1) enable_irq(irq) | |
129 | #define DISABLE(irq) if (irq != -1) disable_irq(irq) | |
130 | ||
131 | /* In micro second */ | |
132 | #define PLIP_DELAY_UNIT 1 | |
133 | ||
134 | /* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */ | |
135 | #define PLIP_TRIGGER_WAIT 500 | |
136 | ||
137 | /* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */ | |
138 | #define PLIP_NIBBLE_WAIT 3000 | |
139 | ||
140 | /* Bottom halves */ | |
c4028958 DH |
141 | static void plip_kick_bh(struct work_struct *work); |
142 | static void plip_bh(struct work_struct *work); | |
143 | static void plip_timer_bh(struct work_struct *work); | |
1da177e4 LT |
144 | |
145 | /* Interrupt handler */ | |
5712cb3d | 146 | static void plip_interrupt(void *dev_id); |
1da177e4 LT |
147 | |
148 | /* Functions for DEV methods */ | |
149 | static int plip_tx_packet(struct sk_buff *skb, struct net_device *dev); | |
150 | static int plip_hard_header(struct sk_buff *skb, struct net_device *dev, | |
3b04ddde SH |
151 | unsigned short type, const void *daddr, |
152 | const void *saddr, unsigned len); | |
153 | static int plip_hard_header_cache(const struct neighbour *neigh, | |
e69dd336 | 154 | struct hh_cache *hh, __be16 type); |
1da177e4 LT |
155 | static int plip_open(struct net_device *dev); |
156 | static int plip_close(struct net_device *dev); | |
1da177e4 LT |
157 | static int plip_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); |
158 | static int plip_preempt(void *handle); | |
159 | static void plip_wakeup(void *handle); | |
77933d72 | 160 | |
1da177e4 LT |
161 | enum plip_connection_state { |
162 | PLIP_CN_NONE=0, | |
163 | PLIP_CN_RECEIVE, | |
164 | PLIP_CN_SEND, | |
165 | PLIP_CN_CLOSING, | |
166 | PLIP_CN_ERROR | |
167 | }; | |
168 | ||
169 | enum plip_packet_state { | |
170 | PLIP_PK_DONE=0, | |
171 | PLIP_PK_TRIGGER, | |
172 | PLIP_PK_LENGTH_LSB, | |
173 | PLIP_PK_LENGTH_MSB, | |
174 | PLIP_PK_DATA, | |
175 | PLIP_PK_CHECKSUM | |
176 | }; | |
177 | ||
178 | enum plip_nibble_state { | |
179 | PLIP_NB_BEGIN, | |
180 | PLIP_NB_1, | |
181 | PLIP_NB_2, | |
182 | }; | |
183 | ||
184 | struct plip_local { | |
185 | enum plip_packet_state state; | |
186 | enum plip_nibble_state nibble; | |
187 | union { | |
188 | struct { | |
189 | #if defined(__LITTLE_ENDIAN) | |
190 | unsigned char lsb; | |
191 | unsigned char msb; | |
192 | #elif defined(__BIG_ENDIAN) | |
193 | unsigned char msb; | |
194 | unsigned char lsb; | |
195 | #else | |
196 | #error "Please fix the endianness defines in <asm/byteorder.h>" | |
197 | #endif | |
198 | } b; | |
199 | unsigned short h; | |
200 | } length; | |
201 | unsigned short byte; | |
202 | unsigned char checksum; | |
203 | unsigned char data; | |
204 | struct sk_buff *skb; | |
205 | }; | |
206 | ||
207 | struct net_local { | |
c4028958 | 208 | struct net_device *dev; |
1da177e4 | 209 | struct work_struct immediate; |
c4028958 DH |
210 | struct delayed_work deferred; |
211 | struct delayed_work timer; | |
1da177e4 LT |
212 | struct plip_local snd_data; |
213 | struct plip_local rcv_data; | |
214 | struct pardevice *pardev; | |
215 | unsigned long trigger; | |
216 | unsigned long nibble; | |
217 | enum plip_connection_state connection; | |
218 | unsigned short timeout_count; | |
219 | int is_deferred; | |
220 | int port_owner; | |
221 | int should_relinquish; | |
1da177e4 LT |
222 | spinlock_t lock; |
223 | atomic_t kill_timer; | |
01f31ac8 | 224 | struct completion killed_timer_cmp; |
1da177e4 | 225 | }; |
77933d72 JJ |
226 | |
227 | static inline void enable_parport_interrupts (struct net_device *dev) | |
1da177e4 LT |
228 | { |
229 | if (dev->irq != -1) | |
230 | { | |
231 | struct parport *port = | |
4cf1653a | 232 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
1da177e4 LT |
233 | port->ops->enable_irq (port); |
234 | } | |
235 | } | |
236 | ||
77933d72 | 237 | static inline void disable_parport_interrupts (struct net_device *dev) |
1da177e4 LT |
238 | { |
239 | if (dev->irq != -1) | |
240 | { | |
241 | struct parport *port = | |
4cf1653a | 242 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
1da177e4 LT |
243 | port->ops->disable_irq (port); |
244 | } | |
245 | } | |
246 | ||
77933d72 | 247 | static inline void write_data (struct net_device *dev, unsigned char data) |
1da177e4 LT |
248 | { |
249 | struct parport *port = | |
4cf1653a | 250 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
1da177e4 LT |
251 | |
252 | port->ops->write_data (port, data); | |
253 | } | |
254 | ||
77933d72 | 255 | static inline unsigned char read_status (struct net_device *dev) |
1da177e4 LT |
256 | { |
257 | struct parport *port = | |
4cf1653a | 258 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
1da177e4 LT |
259 | |
260 | return port->ops->read_status (port); | |
261 | } | |
77933d72 | 262 | |
3b04ddde SH |
263 | static const struct header_ops plip_header_ops = { |
264 | .create = plip_hard_header, | |
265 | .cache = plip_hard_header_cache, | |
266 | }; | |
267 | ||
ed8cf436 SH |
268 | static const struct net_device_ops plip_netdev_ops = { |
269 | .ndo_open = plip_open, | |
270 | .ndo_stop = plip_close, | |
271 | .ndo_start_xmit = plip_tx_packet, | |
272 | .ndo_do_ioctl = plip_ioctl, | |
635ecaa7 | 273 | .ndo_change_mtu = eth_change_mtu, |
240c102d BH |
274 | .ndo_set_mac_address = eth_mac_addr, |
275 | .ndo_validate_addr = eth_validate_addr, | |
ed8cf436 SH |
276 | }; |
277 | ||
1da177e4 LT |
278 | /* Entry point of PLIP driver. |
279 | Probe the hardware, and register/initialize the driver. | |
280 | ||
281 | PLIP is rather weird, because of the way it interacts with the parport | |
282 | system. It is _not_ initialised from Space.c. Instead, plip_init() | |
283 | is called, and that function makes up a "struct net_device" for each port, and | |
284 | then calls us here. | |
285 | ||
286 | */ | |
287 | static void | |
288 | plip_init_netdev(struct net_device *dev) | |
289 | { | |
290 | struct net_local *nl = netdev_priv(dev); | |
291 | ||
292 | /* Then, override parts of it */ | |
1da177e4 LT |
293 | dev->tx_queue_len = 10; |
294 | dev->flags = IFF_POINTOPOINT|IFF_NOARP; | |
295 | memset(dev->dev_addr, 0xfc, ETH_ALEN); | |
296 | ||
ed8cf436 | 297 | dev->netdev_ops = &plip_netdev_ops; |
3b04ddde | 298 | dev->header_ops = &plip_header_ops; |
1da177e4 LT |
299 | |
300 | ||
301 | nl->port_owner = 0; | |
302 | ||
303 | /* Initialize constants */ | |
304 | nl->trigger = PLIP_TRIGGER_WAIT; | |
305 | nl->nibble = PLIP_NIBBLE_WAIT; | |
306 | ||
307 | /* Initialize task queue structures */ | |
c4028958 DH |
308 | INIT_WORK(&nl->immediate, plip_bh); |
309 | INIT_DELAYED_WORK(&nl->deferred, plip_kick_bh); | |
1da177e4 LT |
310 | |
311 | if (dev->irq == -1) | |
c4028958 | 312 | INIT_DELAYED_WORK(&nl->timer, plip_timer_bh); |
1da177e4 LT |
313 | |
314 | spin_lock_init(&nl->lock); | |
315 | } | |
77933d72 | 316 | |
1da177e4 LT |
317 | /* Bottom half handler for the delayed request. |
318 | This routine is kicked by do_timer(). | |
319 | Request `plip_bh' to be invoked. */ | |
320 | static void | |
c4028958 | 321 | plip_kick_bh(struct work_struct *work) |
1da177e4 | 322 | { |
c4028958 DH |
323 | struct net_local *nl = |
324 | container_of(work, struct net_local, deferred.work); | |
1da177e4 LT |
325 | |
326 | if (nl->is_deferred) | |
327 | schedule_work(&nl->immediate); | |
328 | } | |
329 | ||
330 | /* Forward declarations of internal routines */ | |
331 | static int plip_none(struct net_device *, struct net_local *, | |
332 | struct plip_local *, struct plip_local *); | |
333 | static int plip_receive_packet(struct net_device *, struct net_local *, | |
334 | struct plip_local *, struct plip_local *); | |
335 | static int plip_send_packet(struct net_device *, struct net_local *, | |
336 | struct plip_local *, struct plip_local *); | |
337 | static int plip_connection_close(struct net_device *, struct net_local *, | |
338 | struct plip_local *, struct plip_local *); | |
339 | static int plip_error(struct net_device *, struct net_local *, | |
340 | struct plip_local *, struct plip_local *); | |
341 | static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, | |
342 | struct plip_local *snd, | |
343 | struct plip_local *rcv, | |
344 | int error); | |
345 | ||
346 | #define OK 0 | |
347 | #define TIMEOUT 1 | |
348 | #define ERROR 2 | |
349 | #define HS_TIMEOUT 3 | |
350 | ||
351 | typedef int (*plip_func)(struct net_device *dev, struct net_local *nl, | |
352 | struct plip_local *snd, struct plip_local *rcv); | |
353 | ||
f71e1309 | 354 | static const plip_func connection_state_table[] = |
1da177e4 LT |
355 | { |
356 | plip_none, | |
357 | plip_receive_packet, | |
358 | plip_send_packet, | |
359 | plip_connection_close, | |
360 | plip_error | |
361 | }; | |
362 | ||
363 | /* Bottom half handler of PLIP. */ | |
364 | static void | |
c4028958 | 365 | plip_bh(struct work_struct *work) |
1da177e4 | 366 | { |
c4028958 | 367 | struct net_local *nl = container_of(work, struct net_local, immediate); |
1da177e4 LT |
368 | struct plip_local *snd = &nl->snd_data; |
369 | struct plip_local *rcv = &nl->rcv_data; | |
370 | plip_func f; | |
371 | int r; | |
372 | ||
373 | nl->is_deferred = 0; | |
374 | f = connection_state_table[nl->connection]; | |
8e95a202 JP |
375 | if ((r = (*f)(nl->dev, nl, snd, rcv)) != OK && |
376 | (r = plip_bh_timeout_error(nl->dev, nl, snd, rcv, r)) != OK) { | |
1da177e4 LT |
377 | nl->is_deferred = 1; |
378 | schedule_delayed_work(&nl->deferred, 1); | |
379 | } | |
380 | } | |
381 | ||
382 | static void | |
c4028958 | 383 | plip_timer_bh(struct work_struct *work) |
1da177e4 | 384 | { |
c4028958 DH |
385 | struct net_local *nl = |
386 | container_of(work, struct net_local, timer.work); | |
6aa20a22 | 387 | |
1da177e4 | 388 | if (!(atomic_read (&nl->kill_timer))) { |
5712cb3d | 389 | plip_interrupt (nl->dev); |
1da177e4 LT |
390 | |
391 | schedule_delayed_work(&nl->timer, 1); | |
392 | } | |
393 | else { | |
01f31ac8 | 394 | complete(&nl->killed_timer_cmp); |
1da177e4 LT |
395 | } |
396 | } | |
397 | ||
398 | static int | |
399 | plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, | |
400 | struct plip_local *snd, struct plip_local *rcv, | |
401 | int error) | |
402 | { | |
403 | unsigned char c0; | |
404 | /* | |
405 | * This is tricky. If we got here from the beginning of send (either | |
406 | * with ERROR or HS_TIMEOUT) we have IRQ enabled. Otherwise it's | |
407 | * already disabled. With the old variant of {enable,disable}_irq() | |
408 | * extra disable_irq() was a no-op. Now it became mortal - it's | |
409 | * unbalanced and thus we'll never re-enable IRQ (until rmmod plip, | |
410 | * that is). So we have to treat HS_TIMEOUT and ERROR from send | |
411 | * in a special way. | |
412 | */ | |
413 | ||
414 | spin_lock_irq(&nl->lock); | |
415 | if (nl->connection == PLIP_CN_SEND) { | |
416 | ||
417 | if (error != ERROR) { /* Timeout */ | |
418 | nl->timeout_count++; | |
8e95a202 JP |
419 | if ((error == HS_TIMEOUT && nl->timeout_count <= 10) || |
420 | nl->timeout_count <= 3) { | |
1da177e4 LT |
421 | spin_unlock_irq(&nl->lock); |
422 | /* Try again later */ | |
423 | return TIMEOUT; | |
424 | } | |
425 | c0 = read_status(dev); | |
426 | printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n", | |
427 | dev->name, snd->state, c0); | |
428 | } else | |
429 | error = HS_TIMEOUT; | |
09f75cd7 JG |
430 | dev->stats.tx_errors++; |
431 | dev->stats.tx_aborted_errors++; | |
1da177e4 LT |
432 | } else if (nl->connection == PLIP_CN_RECEIVE) { |
433 | if (rcv->state == PLIP_PK_TRIGGER) { | |
434 | /* Transmission was interrupted. */ | |
435 | spin_unlock_irq(&nl->lock); | |
436 | return OK; | |
437 | } | |
438 | if (error != ERROR) { /* Timeout */ | |
439 | if (++nl->timeout_count <= 3) { | |
440 | spin_unlock_irq(&nl->lock); | |
441 | /* Try again later */ | |
442 | return TIMEOUT; | |
443 | } | |
444 | c0 = read_status(dev); | |
445 | printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n", | |
446 | dev->name, rcv->state, c0); | |
447 | } | |
09f75cd7 | 448 | dev->stats.rx_dropped++; |
1da177e4 LT |
449 | } |
450 | rcv->state = PLIP_PK_DONE; | |
451 | if (rcv->skb) { | |
452 | kfree_skb(rcv->skb); | |
453 | rcv->skb = NULL; | |
454 | } | |
455 | snd->state = PLIP_PK_DONE; | |
456 | if (snd->skb) { | |
457 | dev_kfree_skb(snd->skb); | |
458 | snd->skb = NULL; | |
459 | } | |
460 | spin_unlock_irq(&nl->lock); | |
461 | if (error == HS_TIMEOUT) { | |
462 | DISABLE(dev->irq); | |
463 | synchronize_irq(dev->irq); | |
464 | } | |
465 | disable_parport_interrupts (dev); | |
466 | netif_stop_queue (dev); | |
467 | nl->connection = PLIP_CN_ERROR; | |
468 | write_data (dev, 0x00); | |
469 | ||
470 | return TIMEOUT; | |
471 | } | |
77933d72 | 472 | |
1da177e4 LT |
473 | static int |
474 | plip_none(struct net_device *dev, struct net_local *nl, | |
475 | struct plip_local *snd, struct plip_local *rcv) | |
476 | { | |
477 | return OK; | |
478 | } | |
479 | ||
480 | /* PLIP_RECEIVE --- receive a byte(two nibbles) | |
481 | Returns OK on success, TIMEOUT on timeout */ | |
77933d72 | 482 | static inline int |
1da177e4 LT |
483 | plip_receive(unsigned short nibble_timeout, struct net_device *dev, |
484 | enum plip_nibble_state *ns_p, unsigned char *data_p) | |
485 | { | |
486 | unsigned char c0, c1; | |
487 | unsigned int cx; | |
488 | ||
489 | switch (*ns_p) { | |
490 | case PLIP_NB_BEGIN: | |
491 | cx = nibble_timeout; | |
492 | while (1) { | |
493 | c0 = read_status(dev); | |
494 | udelay(PLIP_DELAY_UNIT); | |
495 | if ((c0 & 0x80) == 0) { | |
496 | c1 = read_status(dev); | |
497 | if (c0 == c1) | |
498 | break; | |
499 | } | |
500 | if (--cx == 0) | |
501 | return TIMEOUT; | |
502 | } | |
503 | *data_p = (c0 >> 3) & 0x0f; | |
504 | write_data (dev, 0x10); /* send ACK */ | |
505 | *ns_p = PLIP_NB_1; | |
506 | ||
507 | case PLIP_NB_1: | |
508 | cx = nibble_timeout; | |
509 | while (1) { | |
510 | c0 = read_status(dev); | |
511 | udelay(PLIP_DELAY_UNIT); | |
512 | if (c0 & 0x80) { | |
513 | c1 = read_status(dev); | |
514 | if (c0 == c1) | |
515 | break; | |
516 | } | |
517 | if (--cx == 0) | |
518 | return TIMEOUT; | |
519 | } | |
520 | *data_p |= (c0 << 1) & 0xf0; | |
521 | write_data (dev, 0x00); /* send ACK */ | |
522 | *ns_p = PLIP_NB_BEGIN; | |
523 | case PLIP_NB_2: | |
524 | break; | |
525 | } | |
526 | return OK; | |
527 | } | |
528 | ||
529 | /* | |
6aa20a22 | 530 | * Determine the packet's protocol ID. The rule here is that we |
1da177e4 LT |
531 | * assume 802.3 if the type field is short enough to be a length. |
532 | * This is normal practice and works for any 'now in use' protocol. | |
533 | * | |
534 | * PLIP is ethernet ish but the daddr might not be valid if unicast. | |
535 | * PLIP fortunately has no bus architecture (its Point-to-point). | |
536 | * | |
537 | * We can't fix the daddr thing as that quirk (more bug) is embedded | |
538 | * in far too many old systems not all even running Linux. | |
539 | */ | |
6aa20a22 | 540 | |
ab611487 | 541 | static __be16 plip_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
542 | { |
543 | struct ethhdr *eth; | |
544 | unsigned char *rawp; | |
6aa20a22 | 545 | |
98e399f8 | 546 | skb_reset_mac_header(skb); |
1da177e4 LT |
547 | skb_pull(skb,dev->hard_header_len); |
548 | eth = eth_hdr(skb); | |
6aa20a22 | 549 | |
1da177e4 LT |
550 | if(*eth->h_dest&1) |
551 | { | |
552 | if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0) | |
553 | skb->pkt_type=PACKET_BROADCAST; | |
554 | else | |
555 | skb->pkt_type=PACKET_MULTICAST; | |
556 | } | |
6aa20a22 | 557 | |
1da177e4 LT |
558 | /* |
559 | * This ALLMULTI check should be redundant by 1.4 | |
560 | * so don't forget to remove it. | |
561 | */ | |
6aa20a22 | 562 | |
1da177e4 LT |
563 | if (ntohs(eth->h_proto) >= 1536) |
564 | return eth->h_proto; | |
6aa20a22 | 565 | |
1da177e4 | 566 | rawp = skb->data; |
6aa20a22 | 567 | |
1da177e4 LT |
568 | /* |
569 | * This is a magic hack to spot IPX packets. Older Novell breaks | |
570 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
571 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
572 | * won't work for fault tolerant netware but does for the rest. | |
573 | */ | |
574 | if (*(unsigned short *)rawp == 0xFFFF) | |
575 | return htons(ETH_P_802_3); | |
6aa20a22 | 576 | |
1da177e4 LT |
577 | /* |
578 | * Real 802.2 LLC | |
579 | */ | |
580 | return htons(ETH_P_802_2); | |
581 | } | |
582 | ||
1da177e4 LT |
583 | /* PLIP_RECEIVE_PACKET --- receive a packet */ |
584 | static int | |
585 | plip_receive_packet(struct net_device *dev, struct net_local *nl, | |
586 | struct plip_local *snd, struct plip_local *rcv) | |
587 | { | |
588 | unsigned short nibble_timeout = nl->nibble; | |
589 | unsigned char *lbuf; | |
590 | ||
591 | switch (rcv->state) { | |
592 | case PLIP_PK_TRIGGER: | |
593 | DISABLE(dev->irq); | |
594 | /* Don't need to synchronize irq, as we can safely ignore it */ | |
595 | disable_parport_interrupts (dev); | |
596 | write_data (dev, 0x01); /* send ACK */ | |
597 | if (net_debug > 2) | |
598 | printk(KERN_DEBUG "%s: receive start\n", dev->name); | |
599 | rcv->state = PLIP_PK_LENGTH_LSB; | |
600 | rcv->nibble = PLIP_NB_BEGIN; | |
601 | ||
602 | case PLIP_PK_LENGTH_LSB: | |
603 | if (snd->state != PLIP_PK_DONE) { | |
604 | if (plip_receive(nl->trigger, dev, | |
605 | &rcv->nibble, &rcv->length.b.lsb)) { | |
606 | /* collision, here dev->tbusy == 1 */ | |
607 | rcv->state = PLIP_PK_DONE; | |
608 | nl->is_deferred = 1; | |
609 | nl->connection = PLIP_CN_SEND; | |
610 | schedule_delayed_work(&nl->deferred, 1); | |
611 | enable_parport_interrupts (dev); | |
612 | ENABLE(dev->irq); | |
613 | return OK; | |
614 | } | |
615 | } else { | |
616 | if (plip_receive(nibble_timeout, dev, | |
617 | &rcv->nibble, &rcv->length.b.lsb)) | |
618 | return TIMEOUT; | |
619 | } | |
620 | rcv->state = PLIP_PK_LENGTH_MSB; | |
621 | ||
622 | case PLIP_PK_LENGTH_MSB: | |
623 | if (plip_receive(nibble_timeout, dev, | |
624 | &rcv->nibble, &rcv->length.b.msb)) | |
625 | return TIMEOUT; | |
8e95a202 JP |
626 | if (rcv->length.h > dev->mtu + dev->hard_header_len || |
627 | rcv->length.h < 8) { | |
1da177e4 LT |
628 | printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h); |
629 | return ERROR; | |
630 | } | |
631 | /* Malloc up new buffer. */ | |
632 | rcv->skb = dev_alloc_skb(rcv->length.h + 2); | |
633 | if (rcv->skb == NULL) { | |
634 | printk(KERN_ERR "%s: Memory squeeze.\n", dev->name); | |
635 | return ERROR; | |
636 | } | |
637 | skb_reserve(rcv->skb, 2); /* Align IP on 16 byte boundaries */ | |
638 | skb_put(rcv->skb,rcv->length.h); | |
639 | rcv->skb->dev = dev; | |
640 | rcv->state = PLIP_PK_DATA; | |
641 | rcv->byte = 0; | |
642 | rcv->checksum = 0; | |
643 | ||
644 | case PLIP_PK_DATA: | |
645 | lbuf = rcv->skb->data; | |
e4c3c13c | 646 | do { |
1da177e4 LT |
647 | if (plip_receive(nibble_timeout, dev, |
648 | &rcv->nibble, &lbuf[rcv->byte])) | |
649 | return TIMEOUT; | |
e4c3c13c HE |
650 | } while (++rcv->byte < rcv->length.h); |
651 | do { | |
1da177e4 | 652 | rcv->checksum += lbuf[--rcv->byte]; |
e4c3c13c | 653 | } while (rcv->byte); |
1da177e4 LT |
654 | rcv->state = PLIP_PK_CHECKSUM; |
655 | ||
656 | case PLIP_PK_CHECKSUM: | |
657 | if (plip_receive(nibble_timeout, dev, | |
658 | &rcv->nibble, &rcv->data)) | |
659 | return TIMEOUT; | |
660 | if (rcv->data != rcv->checksum) { | |
09f75cd7 | 661 | dev->stats.rx_crc_errors++; |
1da177e4 LT |
662 | if (net_debug) |
663 | printk(KERN_DEBUG "%s: checksum error\n", dev->name); | |
664 | return ERROR; | |
665 | } | |
666 | rcv->state = PLIP_PK_DONE; | |
667 | ||
668 | case PLIP_PK_DONE: | |
669 | /* Inform the upper layer for the arrival of a packet. */ | |
670 | rcv->skb->protocol=plip_type_trans(rcv->skb, dev); | |
f6ce5cca | 671 | netif_rx_ni(rcv->skb); |
09f75cd7 JG |
672 | dev->stats.rx_bytes += rcv->length.h; |
673 | dev->stats.rx_packets++; | |
1da177e4 LT |
674 | rcv->skb = NULL; |
675 | if (net_debug > 2) | |
676 | printk(KERN_DEBUG "%s: receive end\n", dev->name); | |
677 | ||
678 | /* Close the connection. */ | |
679 | write_data (dev, 0x00); | |
680 | spin_lock_irq(&nl->lock); | |
681 | if (snd->state != PLIP_PK_DONE) { | |
682 | nl->connection = PLIP_CN_SEND; | |
683 | spin_unlock_irq(&nl->lock); | |
684 | schedule_work(&nl->immediate); | |
685 | enable_parport_interrupts (dev); | |
686 | ENABLE(dev->irq); | |
687 | return OK; | |
688 | } else { | |
689 | nl->connection = PLIP_CN_NONE; | |
690 | spin_unlock_irq(&nl->lock); | |
691 | enable_parport_interrupts (dev); | |
692 | ENABLE(dev->irq); | |
693 | return OK; | |
694 | } | |
695 | } | |
696 | return OK; | |
697 | } | |
698 | ||
699 | /* PLIP_SEND --- send a byte (two nibbles) | |
700 | Returns OK on success, TIMEOUT when timeout */ | |
77933d72 | 701 | static inline int |
1da177e4 LT |
702 | plip_send(unsigned short nibble_timeout, struct net_device *dev, |
703 | enum plip_nibble_state *ns_p, unsigned char data) | |
704 | { | |
705 | unsigned char c0; | |
706 | unsigned int cx; | |
707 | ||
708 | switch (*ns_p) { | |
709 | case PLIP_NB_BEGIN: | |
710 | write_data (dev, data & 0x0f); | |
711 | *ns_p = PLIP_NB_1; | |
712 | ||
713 | case PLIP_NB_1: | |
714 | write_data (dev, 0x10 | (data & 0x0f)); | |
715 | cx = nibble_timeout; | |
716 | while (1) { | |
717 | c0 = read_status(dev); | |
718 | if ((c0 & 0x80) == 0) | |
719 | break; | |
720 | if (--cx == 0) | |
721 | return TIMEOUT; | |
722 | udelay(PLIP_DELAY_UNIT); | |
723 | } | |
724 | write_data (dev, 0x10 | (data >> 4)); | |
725 | *ns_p = PLIP_NB_2; | |
726 | ||
727 | case PLIP_NB_2: | |
728 | write_data (dev, (data >> 4)); | |
729 | cx = nibble_timeout; | |
730 | while (1) { | |
731 | c0 = read_status(dev); | |
732 | if (c0 & 0x80) | |
733 | break; | |
734 | if (--cx == 0) | |
735 | return TIMEOUT; | |
736 | udelay(PLIP_DELAY_UNIT); | |
737 | } | |
738 | *ns_p = PLIP_NB_BEGIN; | |
739 | return OK; | |
740 | } | |
741 | return OK; | |
742 | } | |
743 | ||
744 | /* PLIP_SEND_PACKET --- send a packet */ | |
745 | static int | |
746 | plip_send_packet(struct net_device *dev, struct net_local *nl, | |
747 | struct plip_local *snd, struct plip_local *rcv) | |
748 | { | |
749 | unsigned short nibble_timeout = nl->nibble; | |
750 | unsigned char *lbuf; | |
751 | unsigned char c0; | |
752 | unsigned int cx; | |
753 | ||
754 | if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) { | |
755 | printk(KERN_DEBUG "%s: send skb lost\n", dev->name); | |
756 | snd->state = PLIP_PK_DONE; | |
757 | snd->skb = NULL; | |
758 | return ERROR; | |
759 | } | |
760 | ||
761 | switch (snd->state) { | |
762 | case PLIP_PK_TRIGGER: | |
763 | if ((read_status(dev) & 0xf8) != 0x80) | |
764 | return HS_TIMEOUT; | |
765 | ||
766 | /* Trigger remote rx interrupt. */ | |
767 | write_data (dev, 0x08); | |
768 | cx = nl->trigger; | |
769 | while (1) { | |
770 | udelay(PLIP_DELAY_UNIT); | |
771 | spin_lock_irq(&nl->lock); | |
772 | if (nl->connection == PLIP_CN_RECEIVE) { | |
773 | spin_unlock_irq(&nl->lock); | |
774 | /* Interrupted. */ | |
09f75cd7 | 775 | dev->stats.collisions++; |
1da177e4 LT |
776 | return OK; |
777 | } | |
778 | c0 = read_status(dev); | |
779 | if (c0 & 0x08) { | |
780 | spin_unlock_irq(&nl->lock); | |
781 | DISABLE(dev->irq); | |
782 | synchronize_irq(dev->irq); | |
783 | if (nl->connection == PLIP_CN_RECEIVE) { | |
784 | /* Interrupted. | |
785 | We don't need to enable irq, | |
786 | as it is soon disabled. */ | |
787 | /* Yes, we do. New variant of | |
788 | {enable,disable}_irq *counts* | |
789 | them. -- AV */ | |
790 | ENABLE(dev->irq); | |
09f75cd7 | 791 | dev->stats.collisions++; |
1da177e4 LT |
792 | return OK; |
793 | } | |
794 | disable_parport_interrupts (dev); | |
795 | if (net_debug > 2) | |
796 | printk(KERN_DEBUG "%s: send start\n", dev->name); | |
797 | snd->state = PLIP_PK_LENGTH_LSB; | |
798 | snd->nibble = PLIP_NB_BEGIN; | |
799 | nl->timeout_count = 0; | |
800 | break; | |
801 | } | |
802 | spin_unlock_irq(&nl->lock); | |
803 | if (--cx == 0) { | |
804 | write_data (dev, 0x00); | |
805 | return HS_TIMEOUT; | |
806 | } | |
807 | } | |
808 | ||
809 | case PLIP_PK_LENGTH_LSB: | |
810 | if (plip_send(nibble_timeout, dev, | |
811 | &snd->nibble, snd->length.b.lsb)) | |
812 | return TIMEOUT; | |
813 | snd->state = PLIP_PK_LENGTH_MSB; | |
814 | ||
815 | case PLIP_PK_LENGTH_MSB: | |
816 | if (plip_send(nibble_timeout, dev, | |
817 | &snd->nibble, snd->length.b.msb)) | |
818 | return TIMEOUT; | |
819 | snd->state = PLIP_PK_DATA; | |
820 | snd->byte = 0; | |
821 | snd->checksum = 0; | |
822 | ||
823 | case PLIP_PK_DATA: | |
e4c3c13c | 824 | do { |
1da177e4 LT |
825 | if (plip_send(nibble_timeout, dev, |
826 | &snd->nibble, lbuf[snd->byte])) | |
827 | return TIMEOUT; | |
e4c3c13c HE |
828 | } while (++snd->byte < snd->length.h); |
829 | do { | |
1da177e4 | 830 | snd->checksum += lbuf[--snd->byte]; |
e4c3c13c | 831 | } while (snd->byte); |
1da177e4 LT |
832 | snd->state = PLIP_PK_CHECKSUM; |
833 | ||
834 | case PLIP_PK_CHECKSUM: | |
835 | if (plip_send(nibble_timeout, dev, | |
836 | &snd->nibble, snd->checksum)) | |
837 | return TIMEOUT; | |
838 | ||
09f75cd7 | 839 | dev->stats.tx_bytes += snd->skb->len; |
1da177e4 | 840 | dev_kfree_skb(snd->skb); |
09f75cd7 | 841 | dev->stats.tx_packets++; |
1da177e4 LT |
842 | snd->state = PLIP_PK_DONE; |
843 | ||
844 | case PLIP_PK_DONE: | |
845 | /* Close the connection */ | |
846 | write_data (dev, 0x00); | |
847 | snd->skb = NULL; | |
848 | if (net_debug > 2) | |
849 | printk(KERN_DEBUG "%s: send end\n", dev->name); | |
850 | nl->connection = PLIP_CN_CLOSING; | |
851 | nl->is_deferred = 1; | |
852 | schedule_delayed_work(&nl->deferred, 1); | |
853 | enable_parport_interrupts (dev); | |
854 | ENABLE(dev->irq); | |
855 | return OK; | |
856 | } | |
857 | return OK; | |
858 | } | |
859 | ||
860 | static int | |
861 | plip_connection_close(struct net_device *dev, struct net_local *nl, | |
862 | struct plip_local *snd, struct plip_local *rcv) | |
863 | { | |
864 | spin_lock_irq(&nl->lock); | |
865 | if (nl->connection == PLIP_CN_CLOSING) { | |
866 | nl->connection = PLIP_CN_NONE; | |
867 | netif_wake_queue (dev); | |
868 | } | |
869 | spin_unlock_irq(&nl->lock); | |
870 | if (nl->should_relinquish) { | |
871 | nl->should_relinquish = nl->port_owner = 0; | |
872 | parport_release(nl->pardev); | |
873 | } | |
874 | return OK; | |
875 | } | |
876 | ||
877 | /* PLIP_ERROR --- wait till other end settled */ | |
878 | static int | |
879 | plip_error(struct net_device *dev, struct net_local *nl, | |
880 | struct plip_local *snd, struct plip_local *rcv) | |
881 | { | |
882 | unsigned char status; | |
883 | ||
884 | status = read_status(dev); | |
885 | if ((status & 0xf8) == 0x80) { | |
886 | if (net_debug > 2) | |
887 | printk(KERN_DEBUG "%s: reset interface.\n", dev->name); | |
888 | nl->connection = PLIP_CN_NONE; | |
889 | nl->should_relinquish = 0; | |
890 | netif_start_queue (dev); | |
891 | enable_parport_interrupts (dev); | |
892 | ENABLE(dev->irq); | |
893 | netif_wake_queue (dev); | |
894 | } else { | |
895 | nl->is_deferred = 1; | |
896 | schedule_delayed_work(&nl->deferred, 1); | |
897 | } | |
898 | ||
899 | return OK; | |
900 | } | |
77933d72 | 901 | |
1da177e4 LT |
902 | /* Handle the parallel port interrupts. */ |
903 | static void | |
5712cb3d | 904 | plip_interrupt(void *dev_id) |
1da177e4 LT |
905 | { |
906 | struct net_device *dev = dev_id; | |
907 | struct net_local *nl; | |
908 | struct plip_local *rcv; | |
909 | unsigned char c0; | |
cabce28e | 910 | unsigned long flags; |
1da177e4 | 911 | |
1da177e4 LT |
912 | nl = netdev_priv(dev); |
913 | rcv = &nl->rcv_data; | |
914 | ||
cabce28e | 915 | spin_lock_irqsave (&nl->lock, flags); |
1da177e4 LT |
916 | |
917 | c0 = read_status(dev); | |
918 | if ((c0 & 0xf8) != 0xc0) { | |
919 | if ((dev->irq != -1) && (net_debug > 1)) | |
920 | printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name); | |
cabce28e | 921 | spin_unlock_irqrestore (&nl->lock, flags); |
1da177e4 LT |
922 | return; |
923 | } | |
924 | ||
925 | if (net_debug > 3) | |
926 | printk(KERN_DEBUG "%s: interrupt.\n", dev->name); | |
927 | ||
928 | switch (nl->connection) { | |
929 | case PLIP_CN_CLOSING: | |
930 | netif_wake_queue (dev); | |
931 | case PLIP_CN_NONE: | |
932 | case PLIP_CN_SEND: | |
933 | rcv->state = PLIP_PK_TRIGGER; | |
934 | nl->connection = PLIP_CN_RECEIVE; | |
935 | nl->timeout_count = 0; | |
936 | schedule_work(&nl->immediate); | |
937 | break; | |
938 | ||
939 | case PLIP_CN_RECEIVE: | |
940 | /* May occur because there is race condition | |
941 | around test and set of dev->interrupt. | |
942 | Ignore this interrupt. */ | |
943 | break; | |
944 | ||
945 | case PLIP_CN_ERROR: | |
946 | printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name); | |
947 | break; | |
948 | } | |
949 | ||
cabce28e | 950 | spin_unlock_irqrestore(&nl->lock, flags); |
1da177e4 | 951 | } |
77933d72 | 952 | |
1da177e4 LT |
953 | static int |
954 | plip_tx_packet(struct sk_buff *skb, struct net_device *dev) | |
955 | { | |
956 | struct net_local *nl = netdev_priv(dev); | |
957 | struct plip_local *snd = &nl->snd_data; | |
958 | ||
959 | if (netif_queue_stopped(dev)) | |
5b548140 | 960 | return NETDEV_TX_BUSY; |
1da177e4 LT |
961 | |
962 | /* We may need to grab the bus */ | |
963 | if (!nl->port_owner) { | |
964 | if (parport_claim(nl->pardev)) | |
5b548140 | 965 | return NETDEV_TX_BUSY; |
1da177e4 LT |
966 | nl->port_owner = 1; |
967 | } | |
968 | ||
969 | netif_stop_queue (dev); | |
6aa20a22 | 970 | |
1da177e4 LT |
971 | if (skb->len > dev->mtu + dev->hard_header_len) { |
972 | printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len); | |
973 | netif_start_queue (dev); | |
5b548140 | 974 | return NETDEV_TX_BUSY; |
1da177e4 LT |
975 | } |
976 | ||
977 | if (net_debug > 2) | |
978 | printk(KERN_DEBUG "%s: send request\n", dev->name); | |
979 | ||
980 | spin_lock_irq(&nl->lock); | |
1da177e4 LT |
981 | snd->skb = skb; |
982 | snd->length.h = skb->len; | |
983 | snd->state = PLIP_PK_TRIGGER; | |
984 | if (nl->connection == PLIP_CN_NONE) { | |
985 | nl->connection = PLIP_CN_SEND; | |
986 | nl->timeout_count = 0; | |
987 | } | |
988 | schedule_work(&nl->immediate); | |
989 | spin_unlock_irq(&nl->lock); | |
6aa20a22 | 990 | |
6ed10654 | 991 | return NETDEV_TX_OK; |
1da177e4 LT |
992 | } |
993 | ||
994 | static void | |
3b04ddde | 995 | plip_rewrite_address(const struct net_device *dev, struct ethhdr *eth) |
1da177e4 | 996 | { |
95ae6b22 | 997 | const struct in_device *in_dev; |
1da177e4 | 998 | |
95ae6b22 ED |
999 | rcu_read_lock(); |
1000 | in_dev = __in_dev_get_rcu(dev); | |
3b04ddde | 1001 | if (in_dev) { |
1da177e4 | 1002 | /* Any address will do - we take the first */ |
3b04ddde SH |
1003 | const struct in_ifaddr *ifa = in_dev->ifa_list; |
1004 | if (ifa) { | |
1da177e4 LT |
1005 | memcpy(eth->h_source, dev->dev_addr, 6); |
1006 | memset(eth->h_dest, 0xfc, 2); | |
1007 | memcpy(eth->h_dest+2, &ifa->ifa_address, 4); | |
1008 | } | |
1009 | } | |
95ae6b22 | 1010 | rcu_read_unlock(); |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | static int | |
1014 | plip_hard_header(struct sk_buff *skb, struct net_device *dev, | |
3b04ddde SH |
1015 | unsigned short type, const void *daddr, |
1016 | const void *saddr, unsigned len) | |
1da177e4 | 1017 | { |
1da177e4 LT |
1018 | int ret; |
1019 | ||
3b04ddde SH |
1020 | ret = eth_header(skb, dev, type, daddr, saddr, len); |
1021 | if (ret >= 0) | |
1da177e4 LT |
1022 | plip_rewrite_address (dev, (struct ethhdr *)skb->data); |
1023 | ||
1024 | return ret; | |
1025 | } | |
1026 | ||
dac499f9 | 1027 | static int plip_hard_header_cache(const struct neighbour *neigh, |
e69dd336 | 1028 | struct hh_cache *hh, __be16 type) |
1da177e4 | 1029 | { |
1da177e4 | 1030 | int ret; |
6aa20a22 | 1031 | |
e69dd336 | 1032 | ret = eth_header_cache(neigh, hh, type); |
3b04ddde | 1033 | if (ret == 0) { |
1da177e4 LT |
1034 | struct ethhdr *eth; |
1035 | ||
1036 | eth = (struct ethhdr*)(((u8*)hh->hh_data) + | |
1037 | HH_DATA_OFF(sizeof(*eth))); | |
1038 | plip_rewrite_address (neigh->dev, eth); | |
1039 | } | |
6aa20a22 | 1040 | |
1da177e4 | 1041 | return ret; |
6aa20a22 | 1042 | } |
1da177e4 LT |
1043 | |
1044 | /* Open/initialize the board. This is called (in the current kernel) | |
1045 | sometime after booting when the 'ifconfig' program is run. | |
1046 | ||
1047 | This routine gets exclusive access to the parallel port by allocating | |
1048 | its IRQ line. | |
1049 | */ | |
1050 | static int | |
1051 | plip_open(struct net_device *dev) | |
1052 | { | |
1053 | struct net_local *nl = netdev_priv(dev); | |
1054 | struct in_device *in_dev; | |
1055 | ||
1056 | /* Grab the port */ | |
1057 | if (!nl->port_owner) { | |
1058 | if (parport_claim(nl->pardev)) return -EAGAIN; | |
1059 | nl->port_owner = 1; | |
1060 | } | |
1061 | ||
1062 | nl->should_relinquish = 0; | |
1063 | ||
1064 | /* Clear the data port. */ | |
1065 | write_data (dev, 0x00); | |
1066 | ||
1067 | /* Enable rx interrupt. */ | |
1068 | enable_parport_interrupts (dev); | |
1069 | if (dev->irq == -1) | |
1070 | { | |
1071 | atomic_set (&nl->kill_timer, 0); | |
1072 | schedule_delayed_work(&nl->timer, 1); | |
1073 | } | |
1074 | ||
1075 | /* Initialize the state machine. */ | |
1076 | nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE; | |
1077 | nl->rcv_data.skb = nl->snd_data.skb = NULL; | |
1078 | nl->connection = PLIP_CN_NONE; | |
1079 | nl->is_deferred = 0; | |
1080 | ||
1081 | /* Fill in the MAC-level header. | |
1082 | We used to abuse dev->broadcast to store the point-to-point | |
1083 | MAC address, but we no longer do it. Instead, we fetch the | |
1084 | interface address whenever it is needed, which is cheap enough | |
1085 | because we use the hh_cache. Actually, abusing dev->broadcast | |
1086 | didn't work, because when using plip_open the point-to-point | |
1087 | address isn't yet known. | |
1088 | PLIP doesn't have a real MAC address, but we need it to be | |
1089 | DOS compatible, and to properly support taps (otherwise, | |
1090 | when the device address isn't identical to the address of a | |
1091 | received frame, the kernel incorrectly drops it). */ | |
1092 | ||
95ae6b22 ED |
1093 | in_dev=__in_dev_get_rtnl(dev); |
1094 | if (in_dev) { | |
1da177e4 LT |
1095 | /* Any address will do - we take the first. We already |
1096 | have the first two bytes filled with 0xfc, from | |
1097 | plip_init_dev(). */ | |
1098 | struct in_ifaddr *ifa=in_dev->ifa_list; | |
1099 | if (ifa != NULL) { | |
1100 | memcpy(dev->dev_addr+2, &ifa->ifa_local, 4); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | netif_start_queue (dev); | |
1105 | ||
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | /* The inverse routine to plip_open (). */ | |
1110 | static int | |
1111 | plip_close(struct net_device *dev) | |
1112 | { | |
1113 | struct net_local *nl = netdev_priv(dev); | |
1114 | struct plip_local *snd = &nl->snd_data; | |
1115 | struct plip_local *rcv = &nl->rcv_data; | |
1116 | ||
1117 | netif_stop_queue (dev); | |
1118 | DISABLE(dev->irq); | |
1119 | synchronize_irq(dev->irq); | |
1120 | ||
1121 | if (dev->irq == -1) | |
1122 | { | |
01f31ac8 | 1123 | init_completion(&nl->killed_timer_cmp); |
1da177e4 | 1124 | atomic_set (&nl->kill_timer, 1); |
01f31ac8 | 1125 | wait_for_completion(&nl->killed_timer_cmp); |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | #ifdef NOTDEF | |
1129 | outb(0x00, PAR_DATA(dev)); | |
1130 | #endif | |
1131 | nl->is_deferred = 0; | |
1132 | nl->connection = PLIP_CN_NONE; | |
1133 | if (nl->port_owner) { | |
1134 | parport_release(nl->pardev); | |
1135 | nl->port_owner = 0; | |
1136 | } | |
1137 | ||
1138 | snd->state = PLIP_PK_DONE; | |
1139 | if (snd->skb) { | |
1140 | dev_kfree_skb(snd->skb); | |
1141 | snd->skb = NULL; | |
1142 | } | |
1143 | rcv->state = PLIP_PK_DONE; | |
1144 | if (rcv->skb) { | |
1145 | kfree_skb(rcv->skb); | |
1146 | rcv->skb = NULL; | |
1147 | } | |
1148 | ||
1149 | #ifdef NOTDEF | |
1150 | /* Reset. */ | |
1151 | outb(0x00, PAR_CONTROL(dev)); | |
1152 | #endif | |
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | static int | |
1157 | plip_preempt(void *handle) | |
1158 | { | |
1159 | struct net_device *dev = (struct net_device *)handle; | |
1160 | struct net_local *nl = netdev_priv(dev); | |
1161 | ||
1162 | /* Stand our ground if a datagram is on the wire */ | |
1163 | if (nl->connection != PLIP_CN_NONE) { | |
1164 | nl->should_relinquish = 1; | |
1165 | return 1; | |
1166 | } | |
1167 | ||
1168 | nl->port_owner = 0; /* Remember that we released the bus */ | |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | static void | |
1173 | plip_wakeup(void *handle) | |
1174 | { | |
1175 | struct net_device *dev = (struct net_device *)handle; | |
1176 | struct net_local *nl = netdev_priv(dev); | |
1177 | ||
1178 | if (nl->port_owner) { | |
1179 | /* Why are we being woken up? */ | |
1180 | printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name); | |
1181 | if (!parport_claim(nl->pardev)) | |
1182 | /* bus_owner is already set (but why?) */ | |
1183 | printk(KERN_DEBUG "%s: I'm broken.\n", dev->name); | |
1184 | else | |
1185 | return; | |
1186 | } | |
6aa20a22 | 1187 | |
1da177e4 LT |
1188 | if (!(dev->flags & IFF_UP)) |
1189 | /* Don't need the port when the interface is down */ | |
1190 | return; | |
1191 | ||
1192 | if (!parport_claim(nl->pardev)) { | |
1193 | nl->port_owner = 1; | |
1194 | /* Clear the data port. */ | |
1195 | write_data (dev, 0x00); | |
1196 | } | |
1da177e4 LT |
1197 | } |
1198 | ||
1da177e4 LT |
1199 | static int |
1200 | plip_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
1201 | { | |
1202 | struct net_local *nl = netdev_priv(dev); | |
1203 | struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru; | |
1204 | ||
1205 | if (cmd != SIOCDEVPLIP) | |
1206 | return -EOPNOTSUPP; | |
1207 | ||
1208 | switch(pc->pcmd) { | |
1209 | case PLIP_GET_TIMEOUT: | |
1210 | pc->trigger = nl->trigger; | |
1211 | pc->nibble = nl->nibble; | |
1212 | break; | |
1213 | case PLIP_SET_TIMEOUT: | |
1214 | if(!capable(CAP_NET_ADMIN)) | |
1215 | return -EPERM; | |
1216 | nl->trigger = pc->trigger; | |
1217 | nl->nibble = pc->nibble; | |
1218 | break; | |
1219 | default: | |
1220 | return -EOPNOTSUPP; | |
1221 | } | |
1222 | return 0; | |
1223 | } | |
77933d72 | 1224 | |
1da177e4 LT |
1225 | static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 }; |
1226 | static int timid; | |
1227 | ||
1228 | module_param_array(parport, int, NULL, 0); | |
1229 | module_param(timid, int, 0); | |
1230 | MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip"); | |
1231 | ||
1232 | static struct net_device *dev_plip[PLIP_MAX] = { NULL, }; | |
1233 | ||
1234 | static inline int | |
1235 | plip_searchfor(int list[], int a) | |
1236 | { | |
1237 | int i; | |
1238 | for (i = 0; i < PLIP_MAX && list[i] != -1; i++) { | |
1239 | if (list[i] == a) return 1; | |
1240 | } | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | /* plip_attach() is called (by the parport code) when a port is | |
1245 | * available to use. */ | |
1246 | static void plip_attach (struct parport *port) | |
1247 | { | |
1248 | static int unit; | |
1249 | struct net_device *dev; | |
1250 | struct net_local *nl; | |
1251 | char name[IFNAMSIZ]; | |
1252 | ||
6aa20a22 | 1253 | if ((parport[0] == -1 && (!timid || !port->devices)) || |
1da177e4 LT |
1254 | plip_searchfor(parport, port->number)) { |
1255 | if (unit == PLIP_MAX) { | |
1256 | printk(KERN_ERR "plip: too many devices\n"); | |
1257 | return; | |
1258 | } | |
1259 | ||
1260 | sprintf(name, "plip%d", unit); | |
1261 | dev = alloc_etherdev(sizeof(struct net_local)); | |
41de8d4c | 1262 | if (!dev) |
1da177e4 | 1263 | return; |
6aa20a22 | 1264 | |
1da177e4 LT |
1265 | strcpy(dev->name, name); |
1266 | ||
1da177e4 LT |
1267 | dev->irq = port->irq; |
1268 | dev->base_addr = port->base; | |
1269 | if (port->irq == -1) { | |
1270 | printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode," | |
1271 | "which is fairly inefficient!\n", port->name); | |
1272 | } | |
1273 | ||
1274 | nl = netdev_priv(dev); | |
c4028958 | 1275 | nl->dev = dev; |
cdb32706 | 1276 | nl->pardev = parport_register_device(port, dev->name, plip_preempt, |
6aa20a22 | 1277 | plip_wakeup, plip_interrupt, |
1da177e4 LT |
1278 | 0, dev); |
1279 | ||
1280 | if (!nl->pardev) { | |
1281 | printk(KERN_ERR "%s: parport_register failed\n", name); | |
1282 | goto err_free_dev; | |
1da177e4 LT |
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"); |