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). */
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>
14 * Modularization and ifreq/ifmap support by Alan Cox.
15 * Rewritten by Niibe Yutaka.
16 * parport-sharing awareness code by Philip Blundell.
17 * SMP locking by Niibe Yutaka.
18 * Support for parallel ports with no IRQ (poll mode),
19 * Modifications to use the parallel port API
24 * - Module initialization.
26 * - Make sure other end is OK, before sending a packet.
27 * - Fix immediate timer problem.
30 * - Changed {enable,disable}_irq handling to make it work
31 * with new ("stack") semantics.
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.
40 * Original version and the name 'PLIP' from Donald Becker <becker@scyld.com>
41 * inspired by Russ Nelson's parallel port packet driver.
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.
49 * This version follows original PLIP protocol.
50 * So, this PLIP can't communicate the PLIP of Linux v1.0.
54 * To use with DOS box, please do (Turn on ARP switch):
55 * # ifconfig plip[0-2] arp
57 static const char version[] = "NET3 PLIP version 2.4-parport gniibe@mri.co.jp\n";
61 Ideas and protocols came from Russ Nelson's <nelson@crynwr.com>
62 "parallel.asm" parallel port packet driver.
64 The "Crynwr" parallel port standard specifies the following protocol:
65 Trigger by sending nibble '0x8' (this causes interrupt on other end)
70 Each octet is sent as <wait for rx. '0x1?'> <send 0x10+(octet&0x0F)>
71 <wait for rx. '0x0?'> <send 0x00+((octet>>4)&0x0F)>
73 The packet is encapsulated as if it were ethernet.
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:
80 D0->ERROR 2 - 15 15 - 2
81 D1->SLCT 3 - 13 13 - 3
82 D2->PAPOUT 4 - 12 12 - 4
84 D4->BUSY 6 - 11 11 - 6
85 Do not connect the other pins. They are
87 STROBE is 1, FEED is 14, INIT is 16
88 extra grounds are 18,19,20,21,22,23,24
91 #include <linux/module.h>
92 #include <linux/kernel.h>
93 #include <linux/types.h>
94 #include <linux/fcntl.h>
95 #include <linux/interrupt.h>
96 #include <linux/string.h>
97 #include <linux/if_ether.h>
99 #include <linux/errno.h>
100 #include <linux/delay.h>
101 #include <linux/init.h>
102 #include <linux/netdevice.h>
103 #include <linux/etherdevice.h>
104 #include <linux/inetdevice.h>
105 #include <linux/skbuff.h>
106 #include <linux/if_plip.h>
107 #include <linux/workqueue.h>
108 #include <linux/spinlock.h>
109 #include <linux/completion.h>
110 #include <linux/parport.h>
111 #include <linux/bitops.h>
113 #include <net/neighbour.h>
115 #include <asm/system.h>
117 #include <asm/byteorder.h>
119 /* Maximum number of devices to support. */
122 /* Use 0 for production, 1 for verification, >2 for debug */
126 static const unsigned int net_debug = NET_DEBUG;
128 #define ENABLE(irq) if (irq != -1) enable_irq(irq)
129 #define DISABLE(irq) if (irq != -1) disable_irq(irq)
131 /* In micro second */
132 #define PLIP_DELAY_UNIT 1
134 /* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */
135 #define PLIP_TRIGGER_WAIT 500
137 /* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */
138 #define PLIP_NIBBLE_WAIT 3000
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);
145 /* Interrupt handler */
146 static void plip_interrupt(void *dev_id);
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,
151 unsigned short type, const void *daddr,
152 const void *saddr, unsigned len);
153 static int plip_hard_header_cache(const struct neighbour *neigh,
154 struct hh_cache *hh);
155 static int plip_open(struct net_device *dev);
156 static int plip_close(struct net_device *dev);
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);
161 enum plip_connection_state {
169 enum plip_packet_state {
178 enum plip_nibble_state {
185 enum plip_packet_state state;
186 enum plip_nibble_state nibble;
189 #if defined(__LITTLE_ENDIAN)
192 #elif defined(__BIG_ENDIAN)
196 #error "Please fix the endianness defines in <asm/byteorder.h>"
202 unsigned char checksum;
208 struct net_device *dev;
209 struct work_struct immediate;
210 struct delayed_work deferred;
211 struct delayed_work timer;
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;
221 int should_relinquish;
224 struct completion killed_timer_cmp;
227 static inline void enable_parport_interrupts (struct net_device *dev)
231 struct parport *port =
232 ((struct net_local *)dev->priv)->pardev->port;
233 port->ops->enable_irq (port);
237 static inline void disable_parport_interrupts (struct net_device *dev)
241 struct parport *port =
242 ((struct net_local *)dev->priv)->pardev->port;
243 port->ops->disable_irq (port);
247 static inline void write_data (struct net_device *dev, unsigned char data)
249 struct parport *port =
250 ((struct net_local *)dev->priv)->pardev->port;
252 port->ops->write_data (port, data);
255 static inline unsigned char read_status (struct net_device *dev)
257 struct parport *port =
258 ((struct net_local *)dev->priv)->pardev->port;
260 return port->ops->read_status (port);
263 static const struct header_ops plip_header_ops = {
264 .create = plip_hard_header,
265 .cache = plip_hard_header_cache,
268 /* Entry point of PLIP driver.
269 Probe the hardware, and register/initialize the driver.
271 PLIP is rather weird, because of the way it interacts with the parport
272 system. It is _not_ initialised from Space.c. Instead, plip_init()
273 is called, and that function makes up a "struct net_device" for each port, and
278 plip_init_netdev(struct net_device *dev)
280 struct net_local *nl = netdev_priv(dev);
282 /* Then, override parts of it */
283 dev->hard_start_xmit = plip_tx_packet;
284 dev->open = plip_open;
285 dev->stop = plip_close;
286 dev->do_ioctl = plip_ioctl;
288 dev->tx_queue_len = 10;
289 dev->flags = IFF_POINTOPOINT|IFF_NOARP;
290 memset(dev->dev_addr, 0xfc, ETH_ALEN);
292 dev->header_ops = &plip_header_ops;
297 /* Initialize constants */
298 nl->trigger = PLIP_TRIGGER_WAIT;
299 nl->nibble = PLIP_NIBBLE_WAIT;
301 /* Initialize task queue structures */
302 INIT_WORK(&nl->immediate, plip_bh);
303 INIT_DELAYED_WORK(&nl->deferred, plip_kick_bh);
306 INIT_DELAYED_WORK(&nl->timer, plip_timer_bh);
308 spin_lock_init(&nl->lock);
311 /* Bottom half handler for the delayed request.
312 This routine is kicked by do_timer().
313 Request `plip_bh' to be invoked. */
315 plip_kick_bh(struct work_struct *work)
317 struct net_local *nl =
318 container_of(work, struct net_local, deferred.work);
321 schedule_work(&nl->immediate);
324 /* Forward declarations of internal routines */
325 static int plip_none(struct net_device *, struct net_local *,
326 struct plip_local *, struct plip_local *);
327 static int plip_receive_packet(struct net_device *, struct net_local *,
328 struct plip_local *, struct plip_local *);
329 static int plip_send_packet(struct net_device *, struct net_local *,
330 struct plip_local *, struct plip_local *);
331 static int plip_connection_close(struct net_device *, struct net_local *,
332 struct plip_local *, struct plip_local *);
333 static int plip_error(struct net_device *, struct net_local *,
334 struct plip_local *, struct plip_local *);
335 static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl,
336 struct plip_local *snd,
337 struct plip_local *rcv,
345 typedef int (*plip_func)(struct net_device *dev, struct net_local *nl,
346 struct plip_local *snd, struct plip_local *rcv);
348 static const plip_func connection_state_table[] =
353 plip_connection_close,
357 /* Bottom half handler of PLIP. */
359 plip_bh(struct work_struct *work)
361 struct net_local *nl = container_of(work, struct net_local, immediate);
362 struct plip_local *snd = &nl->snd_data;
363 struct plip_local *rcv = &nl->rcv_data;
368 f = connection_state_table[nl->connection];
369 if ((r = (*f)(nl->dev, nl, snd, rcv)) != OK
370 && (r = plip_bh_timeout_error(nl->dev, nl, snd, rcv, r)) != OK) {
372 schedule_delayed_work(&nl->deferred, 1);
377 plip_timer_bh(struct work_struct *work)
379 struct net_local *nl =
380 container_of(work, struct net_local, timer.work);
382 if (!(atomic_read (&nl->kill_timer))) {
383 plip_interrupt (nl->dev);
385 schedule_delayed_work(&nl->timer, 1);
388 complete(&nl->killed_timer_cmp);
393 plip_bh_timeout_error(struct net_device *dev, struct net_local *nl,
394 struct plip_local *snd, struct plip_local *rcv,
399 * This is tricky. If we got here from the beginning of send (either
400 * with ERROR or HS_TIMEOUT) we have IRQ enabled. Otherwise it's
401 * already disabled. With the old variant of {enable,disable}_irq()
402 * extra disable_irq() was a no-op. Now it became mortal - it's
403 * unbalanced and thus we'll never re-enable IRQ (until rmmod plip,
404 * that is). So we have to treat HS_TIMEOUT and ERROR from send
408 spin_lock_irq(&nl->lock);
409 if (nl->connection == PLIP_CN_SEND) {
411 if (error != ERROR) { /* Timeout */
413 if ((error == HS_TIMEOUT
414 && nl->timeout_count <= 10)
415 || nl->timeout_count <= 3) {
416 spin_unlock_irq(&nl->lock);
417 /* Try again later */
420 c0 = read_status(dev);
421 printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n",
422 dev->name, snd->state, c0);
425 dev->stats.tx_errors++;
426 dev->stats.tx_aborted_errors++;
427 } else if (nl->connection == PLIP_CN_RECEIVE) {
428 if (rcv->state == PLIP_PK_TRIGGER) {
429 /* Transmission was interrupted. */
430 spin_unlock_irq(&nl->lock);
433 if (error != ERROR) { /* Timeout */
434 if (++nl->timeout_count <= 3) {
435 spin_unlock_irq(&nl->lock);
436 /* Try again later */
439 c0 = read_status(dev);
440 printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n",
441 dev->name, rcv->state, c0);
443 dev->stats.rx_dropped++;
445 rcv->state = PLIP_PK_DONE;
450 snd->state = PLIP_PK_DONE;
452 dev_kfree_skb(snd->skb);
455 spin_unlock_irq(&nl->lock);
456 if (error == HS_TIMEOUT) {
458 synchronize_irq(dev->irq);
460 disable_parport_interrupts (dev);
461 netif_stop_queue (dev);
462 nl->connection = PLIP_CN_ERROR;
463 write_data (dev, 0x00);
469 plip_none(struct net_device *dev, struct net_local *nl,
470 struct plip_local *snd, struct plip_local *rcv)
475 /* PLIP_RECEIVE --- receive a byte(two nibbles)
476 Returns OK on success, TIMEOUT on timeout */
478 plip_receive(unsigned short nibble_timeout, struct net_device *dev,
479 enum plip_nibble_state *ns_p, unsigned char *data_p)
481 unsigned char c0, c1;
488 c0 = read_status(dev);
489 udelay(PLIP_DELAY_UNIT);
490 if ((c0 & 0x80) == 0) {
491 c1 = read_status(dev);
498 *data_p = (c0 >> 3) & 0x0f;
499 write_data (dev, 0x10); /* send ACK */
505 c0 = read_status(dev);
506 udelay(PLIP_DELAY_UNIT);
508 c1 = read_status(dev);
515 *data_p |= (c0 << 1) & 0xf0;
516 write_data (dev, 0x00); /* send ACK */
517 *ns_p = PLIP_NB_BEGIN;
525 * Determine the packet's protocol ID. The rule here is that we
526 * assume 802.3 if the type field is short enough to be a length.
527 * This is normal practice and works for any 'now in use' protocol.
529 * PLIP is ethernet ish but the daddr might not be valid if unicast.
530 * PLIP fortunately has no bus architecture (its Point-to-point).
532 * We can't fix the daddr thing as that quirk (more bug) is embedded
533 * in far too many old systems not all even running Linux.
536 static __be16 plip_type_trans(struct sk_buff *skb, struct net_device *dev)
541 skb_reset_mac_header(skb);
542 skb_pull(skb,dev->hard_header_len);
547 if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
548 skb->pkt_type=PACKET_BROADCAST;
550 skb->pkt_type=PACKET_MULTICAST;
554 * This ALLMULTI check should be redundant by 1.4
555 * so don't forget to remove it.
558 if (ntohs(eth->h_proto) >= 1536)
564 * This is a magic hack to spot IPX packets. Older Novell breaks
565 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
566 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
567 * won't work for fault tolerant netware but does for the rest.
569 if (*(unsigned short *)rawp == 0xFFFF)
570 return htons(ETH_P_802_3);
575 return htons(ETH_P_802_2);
578 /* PLIP_RECEIVE_PACKET --- receive a packet */
580 plip_receive_packet(struct net_device *dev, struct net_local *nl,
581 struct plip_local *snd, struct plip_local *rcv)
583 unsigned short nibble_timeout = nl->nibble;
586 switch (rcv->state) {
587 case PLIP_PK_TRIGGER:
589 /* Don't need to synchronize irq, as we can safely ignore it */
590 disable_parport_interrupts (dev);
591 write_data (dev, 0x01); /* send ACK */
593 printk(KERN_DEBUG "%s: receive start\n", dev->name);
594 rcv->state = PLIP_PK_LENGTH_LSB;
595 rcv->nibble = PLIP_NB_BEGIN;
597 case PLIP_PK_LENGTH_LSB:
598 if (snd->state != PLIP_PK_DONE) {
599 if (plip_receive(nl->trigger, dev,
600 &rcv->nibble, &rcv->length.b.lsb)) {
601 /* collision, here dev->tbusy == 1 */
602 rcv->state = PLIP_PK_DONE;
604 nl->connection = PLIP_CN_SEND;
605 schedule_delayed_work(&nl->deferred, 1);
606 enable_parport_interrupts (dev);
611 if (plip_receive(nibble_timeout, dev,
612 &rcv->nibble, &rcv->length.b.lsb))
615 rcv->state = PLIP_PK_LENGTH_MSB;
617 case PLIP_PK_LENGTH_MSB:
618 if (plip_receive(nibble_timeout, dev,
619 &rcv->nibble, &rcv->length.b.msb))
621 if (rcv->length.h > dev->mtu + dev->hard_header_len
622 || rcv->length.h < 8) {
623 printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h);
626 /* Malloc up new buffer. */
627 rcv->skb = dev_alloc_skb(rcv->length.h + 2);
628 if (rcv->skb == NULL) {
629 printk(KERN_ERR "%s: Memory squeeze.\n", dev->name);
632 skb_reserve(rcv->skb, 2); /* Align IP on 16 byte boundaries */
633 skb_put(rcv->skb,rcv->length.h);
635 rcv->state = PLIP_PK_DATA;
640 lbuf = rcv->skb->data;
642 if (plip_receive(nibble_timeout, dev,
643 &rcv->nibble, &lbuf[rcv->byte]))
645 while (++rcv->byte < rcv->length.h);
647 rcv->checksum += lbuf[--rcv->byte];
649 rcv->state = PLIP_PK_CHECKSUM;
651 case PLIP_PK_CHECKSUM:
652 if (plip_receive(nibble_timeout, dev,
653 &rcv->nibble, &rcv->data))
655 if (rcv->data != rcv->checksum) {
656 dev->stats.rx_crc_errors++;
658 printk(KERN_DEBUG "%s: checksum error\n", dev->name);
661 rcv->state = PLIP_PK_DONE;
664 /* Inform the upper layer for the arrival of a packet. */
665 rcv->skb->protocol=plip_type_trans(rcv->skb, dev);
666 netif_rx_ni(rcv->skb);
667 dev->last_rx = jiffies;
668 dev->stats.rx_bytes += rcv->length.h;
669 dev->stats.rx_packets++;
672 printk(KERN_DEBUG "%s: receive end\n", dev->name);
674 /* Close the connection. */
675 write_data (dev, 0x00);
676 spin_lock_irq(&nl->lock);
677 if (snd->state != PLIP_PK_DONE) {
678 nl->connection = PLIP_CN_SEND;
679 spin_unlock_irq(&nl->lock);
680 schedule_work(&nl->immediate);
681 enable_parport_interrupts (dev);
685 nl->connection = PLIP_CN_NONE;
686 spin_unlock_irq(&nl->lock);
687 enable_parport_interrupts (dev);
695 /* PLIP_SEND --- send a byte (two nibbles)
696 Returns OK on success, TIMEOUT when timeout */
698 plip_send(unsigned short nibble_timeout, struct net_device *dev,
699 enum plip_nibble_state *ns_p, unsigned char data)
706 write_data (dev, data & 0x0f);
710 write_data (dev, 0x10 | (data & 0x0f));
713 c0 = read_status(dev);
714 if ((c0 & 0x80) == 0)
718 udelay(PLIP_DELAY_UNIT);
720 write_data (dev, 0x10 | (data >> 4));
724 write_data (dev, (data >> 4));
727 c0 = read_status(dev);
732 udelay(PLIP_DELAY_UNIT);
734 *ns_p = PLIP_NB_BEGIN;
740 /* PLIP_SEND_PACKET --- send a packet */
742 plip_send_packet(struct net_device *dev, struct net_local *nl,
743 struct plip_local *snd, struct plip_local *rcv)
745 unsigned short nibble_timeout = nl->nibble;
750 if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) {
751 printk(KERN_DEBUG "%s: send skb lost\n", dev->name);
752 snd->state = PLIP_PK_DONE;
757 switch (snd->state) {
758 case PLIP_PK_TRIGGER:
759 if ((read_status(dev) & 0xf8) != 0x80)
762 /* Trigger remote rx interrupt. */
763 write_data (dev, 0x08);
766 udelay(PLIP_DELAY_UNIT);
767 spin_lock_irq(&nl->lock);
768 if (nl->connection == PLIP_CN_RECEIVE) {
769 spin_unlock_irq(&nl->lock);
771 dev->stats.collisions++;
774 c0 = read_status(dev);
776 spin_unlock_irq(&nl->lock);
778 synchronize_irq(dev->irq);
779 if (nl->connection == PLIP_CN_RECEIVE) {
781 We don't need to enable irq,
782 as it is soon disabled. */
783 /* Yes, we do. New variant of
784 {enable,disable}_irq *counts*
787 dev->stats.collisions++;
790 disable_parport_interrupts (dev);
792 printk(KERN_DEBUG "%s: send start\n", dev->name);
793 snd->state = PLIP_PK_LENGTH_LSB;
794 snd->nibble = PLIP_NB_BEGIN;
795 nl->timeout_count = 0;
798 spin_unlock_irq(&nl->lock);
800 write_data (dev, 0x00);
805 case PLIP_PK_LENGTH_LSB:
806 if (plip_send(nibble_timeout, dev,
807 &snd->nibble, snd->length.b.lsb))
809 snd->state = PLIP_PK_LENGTH_MSB;
811 case PLIP_PK_LENGTH_MSB:
812 if (plip_send(nibble_timeout, dev,
813 &snd->nibble, snd->length.b.msb))
815 snd->state = PLIP_PK_DATA;
821 if (plip_send(nibble_timeout, dev,
822 &snd->nibble, lbuf[snd->byte]))
824 while (++snd->byte < snd->length.h);
826 snd->checksum += lbuf[--snd->byte];
828 snd->state = PLIP_PK_CHECKSUM;
830 case PLIP_PK_CHECKSUM:
831 if (plip_send(nibble_timeout, dev,
832 &snd->nibble, snd->checksum))
835 dev->stats.tx_bytes += snd->skb->len;
836 dev_kfree_skb(snd->skb);
837 dev->stats.tx_packets++;
838 snd->state = PLIP_PK_DONE;
841 /* Close the connection */
842 write_data (dev, 0x00);
845 printk(KERN_DEBUG "%s: send end\n", dev->name);
846 nl->connection = PLIP_CN_CLOSING;
848 schedule_delayed_work(&nl->deferred, 1);
849 enable_parport_interrupts (dev);
857 plip_connection_close(struct net_device *dev, struct net_local *nl,
858 struct plip_local *snd, struct plip_local *rcv)
860 spin_lock_irq(&nl->lock);
861 if (nl->connection == PLIP_CN_CLOSING) {
862 nl->connection = PLIP_CN_NONE;
863 netif_wake_queue (dev);
865 spin_unlock_irq(&nl->lock);
866 if (nl->should_relinquish) {
867 nl->should_relinquish = nl->port_owner = 0;
868 parport_release(nl->pardev);
873 /* PLIP_ERROR --- wait till other end settled */
875 plip_error(struct net_device *dev, struct net_local *nl,
876 struct plip_local *snd, struct plip_local *rcv)
878 unsigned char status;
880 status = read_status(dev);
881 if ((status & 0xf8) == 0x80) {
883 printk(KERN_DEBUG "%s: reset interface.\n", dev->name);
884 nl->connection = PLIP_CN_NONE;
885 nl->should_relinquish = 0;
886 netif_start_queue (dev);
887 enable_parport_interrupts (dev);
889 netif_wake_queue (dev);
892 schedule_delayed_work(&nl->deferred, 1);
898 /* Handle the parallel port interrupts. */
900 plip_interrupt(void *dev_id)
902 struct net_device *dev = dev_id;
903 struct net_local *nl;
904 struct plip_local *rcv;
908 nl = netdev_priv(dev);
911 spin_lock_irqsave (&nl->lock, flags);
913 c0 = read_status(dev);
914 if ((c0 & 0xf8) != 0xc0) {
915 if ((dev->irq != -1) && (net_debug > 1))
916 printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name);
917 spin_unlock_irqrestore (&nl->lock, flags);
922 printk(KERN_DEBUG "%s: interrupt.\n", dev->name);
924 switch (nl->connection) {
925 case PLIP_CN_CLOSING:
926 netif_wake_queue (dev);
929 rcv->state = PLIP_PK_TRIGGER;
930 nl->connection = PLIP_CN_RECEIVE;
931 nl->timeout_count = 0;
932 schedule_work(&nl->immediate);
935 case PLIP_CN_RECEIVE:
936 /* May occur because there is race condition
937 around test and set of dev->interrupt.
938 Ignore this interrupt. */
942 printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name);
946 spin_unlock_irqrestore(&nl->lock, flags);
950 plip_tx_packet(struct sk_buff *skb, struct net_device *dev)
952 struct net_local *nl = netdev_priv(dev);
953 struct plip_local *snd = &nl->snd_data;
955 if (netif_queue_stopped(dev))
958 /* We may need to grab the bus */
959 if (!nl->port_owner) {
960 if (parport_claim(nl->pardev))
965 netif_stop_queue (dev);
967 if (skb->len > dev->mtu + dev->hard_header_len) {
968 printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len);
969 netif_start_queue (dev);
974 printk(KERN_DEBUG "%s: send request\n", dev->name);
976 spin_lock_irq(&nl->lock);
977 dev->trans_start = jiffies;
979 snd->length.h = skb->len;
980 snd->state = PLIP_PK_TRIGGER;
981 if (nl->connection == PLIP_CN_NONE) {
982 nl->connection = PLIP_CN_SEND;
983 nl->timeout_count = 0;
985 schedule_work(&nl->immediate);
986 spin_unlock_irq(&nl->lock);
992 plip_rewrite_address(const struct net_device *dev, struct ethhdr *eth)
994 const struct in_device *in_dev = dev->ip_ptr;
997 /* Any address will do - we take the first */
998 const struct in_ifaddr *ifa = in_dev->ifa_list;
1000 memcpy(eth->h_source, dev->dev_addr, 6);
1001 memset(eth->h_dest, 0xfc, 2);
1002 memcpy(eth->h_dest+2, &ifa->ifa_address, 4);
1008 plip_hard_header(struct sk_buff *skb, struct net_device *dev,
1009 unsigned short type, const void *daddr,
1010 const void *saddr, unsigned len)
1014 ret = eth_header(skb, dev, type, daddr, saddr, len);
1016 plip_rewrite_address (dev, (struct ethhdr *)skb->data);
1021 int plip_hard_header_cache(const struct neighbour *neigh,
1022 struct hh_cache *hh)
1026 ret = eth_header_cache(neigh, hh);
1030 eth = (struct ethhdr*)(((u8*)hh->hh_data) +
1031 HH_DATA_OFF(sizeof(*eth)));
1032 plip_rewrite_address (neigh->dev, eth);
1038 /* Open/initialize the board. This is called (in the current kernel)
1039 sometime after booting when the 'ifconfig' program is run.
1041 This routine gets exclusive access to the parallel port by allocating
1045 plip_open(struct net_device *dev)
1047 struct net_local *nl = netdev_priv(dev);
1048 struct in_device *in_dev;
1051 if (!nl->port_owner) {
1052 if (parport_claim(nl->pardev)) return -EAGAIN;
1056 nl->should_relinquish = 0;
1058 /* Clear the data port. */
1059 write_data (dev, 0x00);
1061 /* Enable rx interrupt. */
1062 enable_parport_interrupts (dev);
1065 atomic_set (&nl->kill_timer, 0);
1066 schedule_delayed_work(&nl->timer, 1);
1069 /* Initialize the state machine. */
1070 nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE;
1071 nl->rcv_data.skb = nl->snd_data.skb = NULL;
1072 nl->connection = PLIP_CN_NONE;
1073 nl->is_deferred = 0;
1075 /* Fill in the MAC-level header.
1076 We used to abuse dev->broadcast to store the point-to-point
1077 MAC address, but we no longer do it. Instead, we fetch the
1078 interface address whenever it is needed, which is cheap enough
1079 because we use the hh_cache. Actually, abusing dev->broadcast
1080 didn't work, because when using plip_open the point-to-point
1081 address isn't yet known.
1082 PLIP doesn't have a real MAC address, but we need it to be
1083 DOS compatible, and to properly support taps (otherwise,
1084 when the device address isn't identical to the address of a
1085 received frame, the kernel incorrectly drops it). */
1087 if ((in_dev=dev->ip_ptr) != NULL) {
1088 /* Any address will do - we take the first. We already
1089 have the first two bytes filled with 0xfc, from
1091 struct in_ifaddr *ifa=in_dev->ifa_list;
1093 memcpy(dev->dev_addr+2, &ifa->ifa_local, 4);
1097 netif_start_queue (dev);
1102 /* The inverse routine to plip_open (). */
1104 plip_close(struct net_device *dev)
1106 struct net_local *nl = netdev_priv(dev);
1107 struct plip_local *snd = &nl->snd_data;
1108 struct plip_local *rcv = &nl->rcv_data;
1110 netif_stop_queue (dev);
1112 synchronize_irq(dev->irq);
1116 init_completion(&nl->killed_timer_cmp);
1117 atomic_set (&nl->kill_timer, 1);
1118 wait_for_completion(&nl->killed_timer_cmp);
1122 outb(0x00, PAR_DATA(dev));
1124 nl->is_deferred = 0;
1125 nl->connection = PLIP_CN_NONE;
1126 if (nl->port_owner) {
1127 parport_release(nl->pardev);
1131 snd->state = PLIP_PK_DONE;
1133 dev_kfree_skb(snd->skb);
1136 rcv->state = PLIP_PK_DONE;
1138 kfree_skb(rcv->skb);
1144 outb(0x00, PAR_CONTROL(dev));
1150 plip_preempt(void *handle)
1152 struct net_device *dev = (struct net_device *)handle;
1153 struct net_local *nl = netdev_priv(dev);
1155 /* Stand our ground if a datagram is on the wire */
1156 if (nl->connection != PLIP_CN_NONE) {
1157 nl->should_relinquish = 1;
1161 nl->port_owner = 0; /* Remember that we released the bus */
1166 plip_wakeup(void *handle)
1168 struct net_device *dev = (struct net_device *)handle;
1169 struct net_local *nl = netdev_priv(dev);
1171 if (nl->port_owner) {
1172 /* Why are we being woken up? */
1173 printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name);
1174 if (!parport_claim(nl->pardev))
1175 /* bus_owner is already set (but why?) */
1176 printk(KERN_DEBUG "%s: I'm broken.\n", dev->name);
1181 if (!(dev->flags & IFF_UP))
1182 /* Don't need the port when the interface is down */
1185 if (!parport_claim(nl->pardev)) {
1187 /* Clear the data port. */
1188 write_data (dev, 0x00);
1195 plip_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1197 struct net_local *nl = netdev_priv(dev);
1198 struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru;
1200 if (cmd != SIOCDEVPLIP)
1204 case PLIP_GET_TIMEOUT:
1205 pc->trigger = nl->trigger;
1206 pc->nibble = nl->nibble;
1208 case PLIP_SET_TIMEOUT:
1209 if(!capable(CAP_NET_ADMIN))
1211 nl->trigger = pc->trigger;
1212 nl->nibble = pc->nibble;
1220 static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 };
1223 module_param_array(parport, int, NULL, 0);
1224 module_param(timid, int, 0);
1225 MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip");
1227 static struct net_device *dev_plip[PLIP_MAX] = { NULL, };
1230 plip_searchfor(int list[], int a)
1233 for (i = 0; i < PLIP_MAX && list[i] != -1; i++) {
1234 if (list[i] == a) return 1;
1239 /* plip_attach() is called (by the parport code) when a port is
1240 * available to use. */
1241 static void plip_attach (struct parport *port)
1244 struct net_device *dev;
1245 struct net_local *nl;
1246 char name[IFNAMSIZ];
1248 if ((parport[0] == -1 && (!timid || !port->devices)) ||
1249 plip_searchfor(parport, port->number)) {
1250 if (unit == PLIP_MAX) {
1251 printk(KERN_ERR "plip: too many devices\n");
1255 sprintf(name, "plip%d", unit);
1256 dev = alloc_etherdev(sizeof(struct net_local));
1258 printk(KERN_ERR "plip: memory squeeze\n");
1262 strcpy(dev->name, name);
1264 dev->irq = port->irq;
1265 dev->base_addr = port->base;
1266 if (port->irq == -1) {
1267 printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode,"
1268 "which is fairly inefficient!\n", port->name);
1271 nl = netdev_priv(dev);
1273 nl->pardev = parport_register_device(port, dev->name, plip_preempt,
1274 plip_wakeup, plip_interrupt,
1278 printk(KERN_ERR "%s: parport_register failed\n", name);
1283 plip_init_netdev(dev);
1285 if (register_netdev(dev)) {
1286 printk(KERN_ERR "%s: network register failed\n", name);
1287 goto err_parport_unregister;
1290 printk(KERN_INFO "%s", version);
1292 printk(KERN_INFO "%s: Parallel port at %#3lx, "
1294 dev->name, dev->base_addr, dev->irq);
1296 printk(KERN_INFO "%s: Parallel port at %#3lx, "
1298 dev->name, dev->base_addr);
1299 dev_plip[unit++] = dev;
1303 err_parport_unregister:
1304 parport_unregister_device(nl->pardev);
1310 /* plip_detach() is called (by the parport code) when a port is
1311 * no longer available to use. */
1312 static void plip_detach (struct parport *port)
1317 static struct parport_driver plip_driver = {
1319 .attach = plip_attach,
1320 .detach = plip_detach
1323 static void __exit plip_cleanup_module (void)
1325 struct net_device *dev;
1328 parport_unregister_driver (&plip_driver);
1330 for (i=0; i < PLIP_MAX; i++) {
1331 if ((dev = dev_plip[i])) {
1332 struct net_local *nl = netdev_priv(dev);
1333 unregister_netdev(dev);
1335 parport_release(nl->pardev);
1336 parport_unregister_device(nl->pardev);
1345 static int parport_ptr;
1347 static int __init plip_setup(char *str)
1351 str = get_options(str, ARRAY_SIZE(ints), ints);
1354 if (!strncmp(str, "parport", 7)) {
1355 int n = simple_strtoul(str+7, NULL, 10);
1356 if (parport_ptr < PLIP_MAX)
1357 parport[parport_ptr++] = n;
1359 printk(KERN_INFO "plip: too many ports, %s ignored.\n",
1361 } else if (!strcmp(str, "timid")) {
1364 if (ints[0] == 0 || ints[1] == 0) {
1365 /* disable driver on "plip=" or "plip=0" */
1368 printk(KERN_WARNING "warning: 'plip=0x%x' ignored\n",
1375 __setup("plip=", plip_setup);
1377 #endif /* !MODULE */
1379 static int __init plip_init (void)
1381 if (parport[0] == -2)
1384 if (parport[0] != -1 && timid) {
1385 printk(KERN_WARNING "plip: warning, ignoring `timid' since specific ports given.\n");
1389 if (parport_register_driver (&plip_driver)) {
1390 printk (KERN_WARNING "plip: couldn't register driver\n");
1397 module_init(plip_init);
1398 module_exit(plip_cleanup_module);
1399 MODULE_LICENSE("GPL");
1403 * compile-command: "gcc -DMODULE -DMODVERSIONS -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -g -fomit-frame-pointer -pipe -c plip.c"