cris: add arch/cris/include/asm/serial.h
[linux-2.6/next.git] / drivers / net / arcnet / arcnet.c
bloba746ba272f04b5e3b77a4e45f65809a398c73585
1 /*
2 * Linux ARCnet driver - device-independent routines
3 *
4 * Written 1997 by David Woodhouse.
5 * Written 1994-1999 by Avery Pennarun.
6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
7 * Derived from skeleton.c by Donald Becker.
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
12 * **********************
14 * The original copyright was as follows:
16 * skeleton.c Written 1993 by Donald Becker.
17 * Copyright 1993 United States Government as represented by the
18 * Director, National Security Agency. This software may only be used
19 * and distributed according to the terms of the GNU General Public License as
20 * modified by SRC, incorporated herein by reference.
22 * **********************
24 * The change log is now in a file called ChangeLog in this directory.
26 * Sources:
27 * - Crynwr arcnet.com/arcether.com packet drivers.
28 * - arcnet.c v0.00 dated 1/1/94 and apparently by
29 * Donald Becker - it didn't work :)
30 * - skeleton.c v0.05 dated 11/16/93 by Donald Becker
31 * (from Linux Kernel 1.1.45)
32 * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
33 * - The official ARCnet COM9026 data sheets (!) thanks to
34 * Ken Cornetet <kcornete@nyx10.cs.du.edu>
35 * - The official ARCnet COM20020 data sheets.
36 * - Information on some more obscure ARCnet controller chips, thanks
37 * to the nice people at SMSC.
38 * - net/inet/eth.c (from kernel 1.1.50) for header-building info.
39 * - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
40 * - Textual information and more alternate source from Joachim Koenig
41 * <jojo@repas.de>
44 #define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"
46 #include <linux/module.h>
47 #include <linux/types.h>
48 #include <linux/delay.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_arp.h>
51 #include <net/arp.h>
52 #include <linux/init.h>
53 #include <linux/arcdevice.h>
54 #include <linux/jiffies.h>
56 /* "do nothing" functions for protocol drivers */
57 static void null_rx(struct net_device *dev, int bufnum,
58 struct archdr *pkthdr, int length);
59 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
60 unsigned short type, uint8_t daddr);
61 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
62 int length, int bufnum);
64 static void arcnet_rx(struct net_device *dev, int bufnum);
67 * one ArcProto per possible proto ID. None of the elements of
68 * arc_proto_map are allowed to be NULL; they will get set to
69 * arc_proto_default instead. It also must not be NULL; if you would like
70 * to set it to NULL, set it to &arc_proto_null instead.
72 struct ArcProto *arc_proto_map[256], *arc_proto_default,
73 *arc_bcast_proto, *arc_raw_proto;
75 static struct ArcProto arc_proto_null =
77 .suffix = '?',
78 .mtu = XMTU,
79 .is_ip = 0,
80 .rx = null_rx,
81 .build_header = null_build_header,
82 .prepare_tx = null_prepare_tx,
83 .continue_tx = NULL,
84 .ack_tx = NULL
87 /* Exported function prototypes */
88 int arcnet_debug = ARCNET_DEBUG;
90 EXPORT_SYMBOL(arc_proto_map);
91 EXPORT_SYMBOL(arc_proto_default);
92 EXPORT_SYMBOL(arc_bcast_proto);
93 EXPORT_SYMBOL(arc_raw_proto);
94 EXPORT_SYMBOL(arcnet_unregister_proto);
95 EXPORT_SYMBOL(arcnet_debug);
96 EXPORT_SYMBOL(alloc_arcdev);
97 EXPORT_SYMBOL(arcnet_interrupt);
98 EXPORT_SYMBOL(arcnet_open);
99 EXPORT_SYMBOL(arcnet_close);
100 EXPORT_SYMBOL(arcnet_send_packet);
101 EXPORT_SYMBOL(arcnet_timeout);
103 /* Internal function prototypes */
104 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
105 unsigned short type, const void *daddr,
106 const void *saddr, unsigned len);
107 static int arcnet_rebuild_header(struct sk_buff *skb);
108 static int go_tx(struct net_device *dev);
110 static int debug = ARCNET_DEBUG;
111 module_param(debug, int, 0);
112 MODULE_LICENSE("GPL");
114 static int __init arcnet_init(void)
116 int count;
118 arcnet_debug = debug;
120 printk("arcnet loaded.\n");
122 #ifdef ALPHA_WARNING
123 BUGLVL(D_EXTRA) {
124 printk("arcnet: ***\n"
125 "arcnet: * Read arcnet.txt for important release notes!\n"
126 "arcnet: *\n"
127 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
128 "arcnet: * me if you have any questions, comments, or bug reports.\n"
129 "arcnet: ***\n");
131 #endif
133 /* initialize the protocol map */
134 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
135 for (count = 0; count < 256; count++)
136 arc_proto_map[count] = arc_proto_default;
138 BUGLVL(D_DURING)
139 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
140 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
141 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
142 sizeof(struct archdr));
144 return 0;
147 static void __exit arcnet_exit(void)
151 module_init(arcnet_init);
152 module_exit(arcnet_exit);
155 * Dump the contents of an sk_buff
157 #if ARCNET_DEBUG_MAX & D_SKB
158 void arcnet_dump_skb(struct net_device *dev,
159 struct sk_buff *skb, char *desc)
161 char hdr[32];
163 /* dump the packet */
164 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
165 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
166 16, 1, skb->data, skb->len, true);
169 EXPORT_SYMBOL(arcnet_dump_skb);
170 #endif
174 * Dump the contents of an ARCnet buffer
176 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
177 static void arcnet_dump_packet(struct net_device *dev, int bufnum,
178 char *desc, int take_arcnet_lock)
180 struct arcnet_local *lp = netdev_priv(dev);
181 int i, length;
182 unsigned long flags = 0;
183 static uint8_t buf[512];
184 char hdr[32];
186 /* hw.copy_from_card expects IRQ context so take the IRQ lock
187 to keep it single threaded */
188 if(take_arcnet_lock)
189 spin_lock_irqsave(&lp->lock, flags);
191 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
192 if(take_arcnet_lock)
193 spin_unlock_irqrestore(&lp->lock, flags);
195 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
196 length = (buf[2] ? 256 : 512);
198 /* dump the packet */
199 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
200 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
201 16, 1, buf, length, true);
204 #else
206 #define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
208 #endif
212 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
213 * are responsible for registering themselves, but the unregister routine
214 * is pretty generic so we'll do it here.
216 void arcnet_unregister_proto(struct ArcProto *proto)
218 int count;
220 if (arc_proto_default == proto)
221 arc_proto_default = &arc_proto_null;
222 if (arc_bcast_proto == proto)
223 arc_bcast_proto = arc_proto_default;
224 if (arc_raw_proto == proto)
225 arc_raw_proto = arc_proto_default;
227 for (count = 0; count < 256; count++) {
228 if (arc_proto_map[count] == proto)
229 arc_proto_map[count] = arc_proto_default;
235 * Add a buffer to the queue. Only the interrupt handler is allowed to do
236 * this, unless interrupts are disabled.
238 * Note: we don't check for a full queue, since there aren't enough buffers
239 * to more than fill it.
241 static void release_arcbuf(struct net_device *dev, int bufnum)
243 struct arcnet_local *lp = netdev_priv(dev);
244 int i;
246 lp->buf_queue[lp->first_free_buf++] = bufnum;
247 lp->first_free_buf %= 5;
249 BUGLVL(D_DURING) {
250 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
251 bufnum);
252 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
253 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
254 BUGMSG2(D_DURING, "\n");
260 * Get a buffer from the queue. If this returns -1, there are no buffers
261 * available.
263 static int get_arcbuf(struct net_device *dev)
265 struct arcnet_local *lp = netdev_priv(dev);
266 int buf = -1, i;
268 if (!atomic_dec_and_test(&lp->buf_lock)) {
269 /* already in this function */
270 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
271 lp->buf_lock.counter);
273 else { /* we can continue */
274 if (lp->next_buf >= 5)
275 lp->next_buf -= 5;
277 if (lp->next_buf == lp->first_free_buf)
278 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
279 else {
280 buf = lp->buf_queue[lp->next_buf++];
281 lp->next_buf %= 5;
286 BUGLVL(D_DURING) {
287 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
288 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
289 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
290 BUGMSG2(D_DURING, "\n");
293 atomic_inc(&lp->buf_lock);
294 return buf;
298 static int choose_mtu(void)
300 int count, mtu = 65535;
302 /* choose the smallest MTU of all available encaps */
303 for (count = 0; count < 256; count++) {
304 if (arc_proto_map[count] != &arc_proto_null &&
305 arc_proto_map[count]->mtu < mtu) {
306 mtu = arc_proto_map[count]->mtu;
310 return mtu == 65535 ? XMTU : mtu;
313 static const struct header_ops arcnet_header_ops = {
314 .create = arcnet_header,
315 .rebuild = arcnet_rebuild_header,
318 static const struct net_device_ops arcnet_netdev_ops = {
319 .ndo_open = arcnet_open,
320 .ndo_stop = arcnet_close,
321 .ndo_start_xmit = arcnet_send_packet,
322 .ndo_tx_timeout = arcnet_timeout,
325 /* Setup a struct device for ARCnet. */
326 static void arcdev_setup(struct net_device *dev)
328 dev->type = ARPHRD_ARCNET;
329 dev->netdev_ops = &arcnet_netdev_ops;
330 dev->header_ops = &arcnet_header_ops;
331 dev->hard_header_len = sizeof(struct archdr);
332 dev->mtu = choose_mtu();
334 dev->addr_len = ARCNET_ALEN;
335 dev->tx_queue_len = 100;
336 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
337 dev->watchdog_timeo = TX_TIMEOUT;
339 /* New-style flags. */
340 dev->flags = IFF_BROADCAST;
344 struct net_device *alloc_arcdev(const char *name)
346 struct net_device *dev;
348 dev = alloc_netdev(sizeof(struct arcnet_local),
349 name && *name ? name : "arc%d", arcdev_setup);
350 if(dev) {
351 struct arcnet_local *lp = netdev_priv(dev);
352 spin_lock_init(&lp->lock);
355 return dev;
359 * Open/initialize the board. This is called sometime after booting when
360 * the 'ifconfig' program is run.
362 * This routine should set everything up anew at each open, even registers
363 * that "should" only need to be set once at boot, so that there is
364 * non-reboot way to recover if something goes wrong.
366 int arcnet_open(struct net_device *dev)
368 struct arcnet_local *lp = netdev_priv(dev);
369 int count, newmtu, error;
371 BUGMSG(D_INIT,"opened.");
373 if (!try_module_get(lp->hw.owner))
374 return -ENODEV;
376 BUGLVL(D_PROTO) {
377 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
378 arc_proto_default->suffix);
379 for (count = 0; count < 256; count++)
380 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
381 BUGMSG2(D_PROTO, "\n");
385 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
387 /* try to put the card in a defined state - if it fails the first
388 * time, actually reset it.
390 error = -ENODEV;
391 if (ARCRESET(0) && ARCRESET(1))
392 goto out_module_put;
394 newmtu = choose_mtu();
395 if (newmtu < dev->mtu)
396 dev->mtu = newmtu;
398 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
400 /* autodetect the encapsulation for each host. */
401 memset(lp->default_proto, 0, sizeof(lp->default_proto));
403 /* the broadcast address is special - use the 'bcast' protocol */
404 for (count = 0; count < 256; count++) {
405 if (arc_proto_map[count] == arc_bcast_proto) {
406 lp->default_proto[0] = count;
407 break;
411 /* initialize buffers */
412 atomic_set(&lp->buf_lock, 1);
414 lp->next_buf = lp->first_free_buf = 0;
415 release_arcbuf(dev, 0);
416 release_arcbuf(dev, 1);
417 release_arcbuf(dev, 2);
418 release_arcbuf(dev, 3);
419 lp->cur_tx = lp->next_tx = -1;
420 lp->cur_rx = -1;
422 lp->rfc1201.sequence = 1;
424 /* bring up the hardware driver */
425 if (lp->hw.open)
426 lp->hw.open(dev);
428 if (dev->dev_addr[0] == 0)
429 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
430 "for broadcasts!\n");
431 else if (dev->dev_addr[0] == 255)
432 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
433 "DOS networking programs!\n");
435 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
436 if (ASTATUS() & RESETflag) {
437 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
438 ACOMMAND(CFLAGScmd | RESETclear);
442 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
443 /* make sure we're ready to receive IRQ's. */
444 AINTMASK(0);
445 udelay(1); /* give it time to set the mask before
446 * we reset it again. (may not even be
447 * necessary)
449 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
450 lp->intmask = NORXflag | RECONflag;
451 AINTMASK(lp->intmask);
452 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
454 netif_start_queue(dev);
456 return 0;
458 out_module_put:
459 module_put(lp->hw.owner);
460 return error;
464 /* The inverse routine to arcnet_open - shuts down the card. */
465 int arcnet_close(struct net_device *dev)
467 struct arcnet_local *lp = netdev_priv(dev);
469 netif_stop_queue(dev);
471 /* flush TX and disable RX */
472 AINTMASK(0);
473 ACOMMAND(NOTXcmd); /* stop transmit */
474 ACOMMAND(NORXcmd); /* disable receive */
475 mdelay(1);
477 /* shut down the card */
478 lp->hw.close(dev);
479 module_put(lp->hw.owner);
480 return 0;
484 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
485 unsigned short type, const void *daddr,
486 const void *saddr, unsigned len)
488 const struct arcnet_local *lp = netdev_priv(dev);
489 uint8_t _daddr, proto_num;
490 struct ArcProto *proto;
492 BUGMSG(D_DURING,
493 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
494 saddr ? *(uint8_t *) saddr : -1,
495 daddr ? *(uint8_t *) daddr : -1,
496 type, type, len);
498 if (skb->len!=0 && len != skb->len)
499 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
500 skb->len, len);
503 /* Type is host order - ? */
504 if(type == ETH_P_ARCNET) {
505 proto = arc_raw_proto;
506 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
507 _daddr = daddr ? *(uint8_t *) daddr : 0;
509 else if (!daddr) {
511 * if the dest addr isn't provided, we can't choose an encapsulation!
512 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
513 * real header when we do rebuild_header.
515 *(uint16_t *) skb_push(skb, 2) = type;
517 * XXX: Why not use skb->mac_len?
519 if (skb->network_header - skb->mac_header != 2)
520 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
521 (int)(skb->network_header - skb->mac_header));
522 return -2; /* return error -- can't transmit yet! */
524 else {
525 /* otherwise, we can just add the header as usual. */
526 _daddr = *(uint8_t *) daddr;
527 proto_num = lp->default_proto[_daddr];
528 proto = arc_proto_map[proto_num];
529 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
530 proto_num, proto->suffix);
531 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
532 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
533 arc_bcast_proto->suffix);
534 proto = arc_bcast_proto;
537 return proto->build_header(skb, dev, type, _daddr);
542 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
543 * future other address resolution) has completed on this sk_buff. We now
544 * let ARP fill in the destination field.
546 static int arcnet_rebuild_header(struct sk_buff *skb)
548 struct net_device *dev = skb->dev;
549 struct arcnet_local *lp = netdev_priv(dev);
550 int status = 0; /* default is failure */
551 unsigned short type;
552 uint8_t daddr=0;
553 struct ArcProto *proto;
555 * XXX: Why not use skb->mac_len?
557 if (skb->network_header - skb->mac_header != 2) {
558 BUGMSG(D_NORMAL,
559 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
560 (int)(skb->network_header - skb->mac_header));
561 return 0;
563 type = *(uint16_t *) skb_pull(skb, 2);
564 BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
566 if (type == ETH_P_IP) {
567 #ifdef CONFIG_INET
568 BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
569 status = arp_find(&daddr, skb) ? 1 : 0;
570 BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
571 daddr, type);
572 #endif
573 } else {
574 BUGMSG(D_NORMAL,
575 "I don't understand ethernet protocol %Xh addresses!\n", type);
576 dev->stats.tx_errors++;
577 dev->stats.tx_aborted_errors++;
580 /* if we couldn't resolve the address... give up. */
581 if (!status)
582 return 0;
584 /* add the _real_ header this time! */
585 proto = arc_proto_map[lp->default_proto[daddr]];
586 proto->build_header(skb, dev, type, daddr);
588 return 1; /* success */
593 /* Called by the kernel in order to transmit a packet. */
594 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
595 struct net_device *dev)
597 struct arcnet_local *lp = netdev_priv(dev);
598 struct archdr *pkt;
599 struct arc_rfc1201 *soft;
600 struct ArcProto *proto;
601 int txbuf;
602 unsigned long flags;
603 int freeskb, retval;
605 BUGMSG(D_DURING,
606 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
607 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol);
609 pkt = (struct archdr *) skb->data;
610 soft = &pkt->soft.rfc1201;
611 proto = arc_proto_map[soft->proto];
613 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
614 skb->len, pkt->hard.dest);
615 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
617 /* fits in one packet? */
618 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
619 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
620 dev_kfree_skb(skb);
621 return NETDEV_TX_OK; /* don't try again */
624 /* We're busy transmitting a packet... */
625 netif_stop_queue(dev);
627 spin_lock_irqsave(&lp->lock, flags);
628 AINTMASK(0);
629 if(lp->next_tx == -1)
630 txbuf = get_arcbuf(dev);
631 else {
632 txbuf = -1;
634 if (txbuf != -1) {
635 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
636 !proto->ack_tx) {
637 /* done right away and we don't want to acknowledge
638 the package later - forget about it now */
639 dev->stats.tx_bytes += skb->len;
640 freeskb = 1;
641 } else {
642 /* do it the 'split' way */
643 lp->outgoing.proto = proto;
644 lp->outgoing.skb = skb;
645 lp->outgoing.pkt = pkt;
647 freeskb = 0;
649 if (proto->continue_tx &&
650 proto->continue_tx(dev, txbuf)) {
651 BUGMSG(D_NORMAL,
652 "bug! continue_tx finished the first time! "
653 "(proto='%c')\n", proto->suffix);
656 retval = NETDEV_TX_OK;
657 lp->next_tx = txbuf;
658 } else {
659 retval = NETDEV_TX_BUSY;
660 freeskb = 0;
663 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
664 /* make sure we didn't ignore a TX IRQ while we were in here */
665 AINTMASK(0);
667 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
668 lp->intmask |= TXFREEflag|EXCNAKflag;
669 AINTMASK(lp->intmask);
670 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
672 spin_unlock_irqrestore(&lp->lock, flags);
673 if (freeskb) {
674 dev_kfree_skb(skb);
676 return retval; /* no need to try again */
681 * Actually start transmitting a packet that was loaded into a buffer
682 * by prepare_tx. This should _only_ be called by the interrupt handler.
684 static int go_tx(struct net_device *dev)
686 struct arcnet_local *lp = netdev_priv(dev);
688 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
689 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
691 if (lp->cur_tx != -1 || lp->next_tx == -1)
692 return 0;
694 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
696 lp->cur_tx = lp->next_tx;
697 lp->next_tx = -1;
699 /* start sending */
700 ACOMMAND(TXcmd | (lp->cur_tx << 3));
702 dev->stats.tx_packets++;
703 lp->lasttrans_dest = lp->lastload_dest;
704 lp->lastload_dest = 0;
705 lp->excnak_pending = 0;
706 lp->intmask |= TXFREEflag|EXCNAKflag;
708 return 1;
712 /* Called by the kernel when transmit times out */
713 void arcnet_timeout(struct net_device *dev)
715 unsigned long flags;
716 struct arcnet_local *lp = netdev_priv(dev);
717 int status = ASTATUS();
718 char *msg;
720 spin_lock_irqsave(&lp->lock, flags);
721 if (status & TXFREEflag) { /* transmit _DID_ finish */
722 msg = " - missed IRQ?";
723 } else {
724 msg = "";
725 dev->stats.tx_aborted_errors++;
726 lp->timed_out = 1;
727 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
729 dev->stats.tx_errors++;
731 /* make sure we didn't miss a TX or a EXC NAK IRQ */
732 AINTMASK(0);
733 lp->intmask |= TXFREEflag|EXCNAKflag;
734 AINTMASK(lp->intmask);
736 spin_unlock_irqrestore(&lp->lock, flags);
738 if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
739 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
740 msg, status, lp->intmask, lp->lasttrans_dest);
741 lp->last_timeout = jiffies;
744 if (lp->cur_tx == -1)
745 netif_wake_queue(dev);
750 * The typical workload of the driver: Handle the network interface
751 * interrupts. Establish which device needs attention, and call the correct
752 * chipset interrupt handler.
754 irqreturn_t arcnet_interrupt(int irq, void *dev_id)
756 struct net_device *dev = dev_id;
757 struct arcnet_local *lp;
758 int recbuf, status, diagstatus, didsomething, boguscount;
759 int retval = IRQ_NONE;
761 BUGMSG(D_DURING, "\n");
763 BUGMSG(D_DURING, "in arcnet_interrupt\n");
765 lp = netdev_priv(dev);
766 BUG_ON(!lp);
768 spin_lock(&lp->lock);
771 * RESET flag was enabled - if device is not running, we must clear it right
772 * away (but nothing else).
774 if (!netif_running(dev)) {
775 if (ASTATUS() & RESETflag)
776 ACOMMAND(CFLAGScmd | RESETclear);
777 AINTMASK(0);
778 spin_unlock(&lp->lock);
779 return IRQ_HANDLED;
782 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
783 ASTATUS(), lp->intmask);
785 boguscount = 5;
786 do {
787 status = ASTATUS();
788 diagstatus = (status >> 8) & 0xFF;
790 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
791 __FILE__,__LINE__,__func__,status);
792 didsomething = 0;
795 * RESET flag was enabled - card is resetting and if RX is
796 * disabled, it's NOT because we just got a packet.
798 * The card is in an undefined state. Clear it out and start over.
800 if (status & RESETflag) {
801 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
802 arcnet_close(dev);
803 arcnet_open(dev);
805 /* get out of the interrupt handler! */
806 break;
809 * RX is inhibited - we must have received something. Prepare to
810 * receive into the next buffer.
812 * We don't actually copy the received packet from the card until
813 * after the transmit handler runs (and possibly launches the next
814 * tx); this should improve latency slightly if we get both types
815 * of interrupts at once.
817 recbuf = -1;
818 if (status & lp->intmask & NORXflag) {
819 recbuf = lp->cur_rx;
820 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
821 recbuf, status);
823 lp->cur_rx = get_arcbuf(dev);
824 if (lp->cur_rx != -1) {
825 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
826 lp->cur_rx);
827 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
829 didsomething++;
832 if((diagstatus & EXCNAKflag)) {
833 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
834 diagstatus);
836 ACOMMAND(NOTXcmd); /* disable transmit */
837 lp->excnak_pending = 1;
839 ACOMMAND(EXCNAKclear);
840 lp->intmask &= ~(EXCNAKflag);
841 didsomething++;
845 /* a transmit finished, and we're interested in it. */
846 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
847 lp->intmask &= ~(TXFREEflag|EXCNAKflag);
849 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
851 if (lp->cur_tx != -1 && !lp->timed_out) {
852 if(!(status & TXACKflag)) {
853 if (lp->lasttrans_dest != 0) {
854 BUGMSG(D_EXTRA,
855 "transmit was not acknowledged! "
856 "(status=%Xh, dest=%02Xh)\n",
857 status, lp->lasttrans_dest);
858 dev->stats.tx_errors++;
859 dev->stats.tx_carrier_errors++;
860 } else {
861 BUGMSG(D_DURING,
862 "broadcast was not acknowledged; that's normal "
863 "(status=%Xh, dest=%02Xh)\n",
864 status, lp->lasttrans_dest);
868 if (lp->outgoing.proto &&
869 lp->outgoing.proto->ack_tx) {
870 int ackstatus;
871 if(status & TXACKflag)
872 ackstatus=2;
873 else if(lp->excnak_pending)
874 ackstatus=1;
875 else
876 ackstatus=0;
878 lp->outgoing.proto
879 ->ack_tx(dev, ackstatus);
882 if (lp->cur_tx != -1)
883 release_arcbuf(dev, lp->cur_tx);
885 lp->cur_tx = -1;
886 lp->timed_out = 0;
887 didsomething++;
889 /* send another packet if there is one */
890 go_tx(dev);
892 /* continue a split packet, if any */
893 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
894 int txbuf = get_arcbuf(dev);
895 if (txbuf != -1) {
896 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
897 /* that was the last segment */
898 dev->stats.tx_bytes += lp->outgoing.skb->len;
899 if(!lp->outgoing.proto->ack_tx)
901 dev_kfree_skb_irq(lp->outgoing.skb);
902 lp->outgoing.proto = NULL;
905 lp->next_tx = txbuf;
908 /* inform upper layers of idleness, if necessary */
909 if (lp->cur_tx == -1)
910 netif_wake_queue(dev);
912 /* now process the received packet, if any */
913 if (recbuf != -1) {
914 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
916 arcnet_rx(dev, recbuf);
917 release_arcbuf(dev, recbuf);
919 didsomething++;
921 if (status & lp->intmask & RECONflag) {
922 ACOMMAND(CFLAGScmd | CONFIGclear);
923 dev->stats.tx_carrier_errors++;
925 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
926 status);
927 /* MYRECON bit is at bit 7 of diagstatus */
928 if(diagstatus & 0x80)
929 BUGMSG(D_RECON,"Put out that recon myself\n");
931 /* is the RECON info empty or old? */
932 if (!lp->first_recon || !lp->last_recon ||
933 time_after(jiffies, lp->last_recon + HZ * 10)) {
934 if (lp->network_down)
935 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
936 lp->first_recon = lp->last_recon = jiffies;
937 lp->num_recons = lp->network_down = 0;
939 BUGMSG(D_DURING, "recon: clearing counters.\n");
940 } else { /* add to current RECON counter */
941 lp->last_recon = jiffies;
942 lp->num_recons++;
944 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
945 lp->num_recons,
946 (lp->last_recon - lp->first_recon) / HZ,
947 lp->network_down);
949 /* if network is marked up;
950 * and first_recon and last_recon are 60+ apart;
951 * and the average no. of recons counted is
952 * > RECON_THRESHOLD/min;
953 * then print a warning message.
955 if (!lp->network_down &&
956 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
957 lp->num_recons >= RECON_THRESHOLD) {
958 lp->network_down = 1;
959 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
960 } else if (!lp->network_down &&
961 lp->last_recon - lp->first_recon > HZ * 60) {
962 /* reset counters if we've gone for over a minute. */
963 lp->first_recon = lp->last_recon;
964 lp->num_recons = 1;
967 } else if (lp->network_down &&
968 time_after(jiffies, lp->last_recon + HZ * 10)) {
969 if (lp->network_down)
970 BUGMSG(D_NORMAL, "cabling restored?\n");
971 lp->first_recon = lp->last_recon = 0;
972 lp->num_recons = lp->network_down = 0;
974 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
977 if(didsomething) {
978 retval |= IRQ_HANDLED;
981 while (--boguscount && didsomething);
983 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
984 ASTATUS(), boguscount);
985 BUGMSG(D_DURING, "\n");
988 AINTMASK(0);
989 udelay(1);
990 AINTMASK(lp->intmask);
992 spin_unlock(&lp->lock);
993 return retval;
998 * This is a generic packet receiver that calls arcnet??_rx depending on the
999 * protocol ID found.
1001 static void arcnet_rx(struct net_device *dev, int bufnum)
1003 struct arcnet_local *lp = netdev_priv(dev);
1004 struct archdr pkt;
1005 struct arc_rfc1201 *soft;
1006 int length, ofs;
1008 soft = &pkt.soft.rfc1201;
1010 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, sizeof(ARC_HDR_SIZE));
1011 if (pkt.hard.offset[0]) {
1012 ofs = pkt.hard.offset[0];
1013 length = 256 - ofs;
1014 } else {
1015 ofs = pkt.hard.offset[1];
1016 length = 512 - ofs;
1019 /* get the full header, if possible */
1020 if (sizeof(pkt.soft) <= length)
1021 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
1022 else {
1023 memset(&pkt.soft, 0, sizeof(pkt.soft));
1024 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
1027 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
1028 "(%d+4 bytes)\n",
1029 bufnum, pkt.hard.source, pkt.hard.dest, length);
1031 dev->stats.rx_packets++;
1032 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
1034 /* call the right receiver for the protocol */
1035 if (arc_proto_map[soft->proto]->is_ip) {
1036 BUGLVL(D_PROTO) {
1037 struct ArcProto
1038 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
1039 *newp = arc_proto_map[soft->proto];
1041 if (oldp != newp) {
1042 BUGMSG(D_PROTO,
1043 "got protocol %02Xh; encap for host %02Xh is now '%c'"
1044 " (was '%c')\n", soft->proto, pkt.hard.source,
1045 newp->suffix, oldp->suffix);
1049 /* broadcasts will always be done with the last-used encap. */
1050 lp->default_proto[0] = soft->proto;
1052 /* in striking contrast, the following isn't a hack. */
1053 lp->default_proto[pkt.hard.source] = soft->proto;
1055 /* call the protocol-specific receiver. */
1056 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1060 static void null_rx(struct net_device *dev, int bufnum,
1061 struct archdr *pkthdr, int length)
1063 BUGMSG(D_PROTO,
1064 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1065 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1069 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1070 unsigned short type, uint8_t daddr)
1072 struct arcnet_local *lp = netdev_priv(dev);
1074 BUGMSG(D_PROTO,
1075 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1076 lp->default_proto[daddr]);
1078 /* always fails */
1079 return 0;
1083 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
1084 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1085 int length, int bufnum)
1087 struct arcnet_local *lp = netdev_priv(dev);
1088 struct arc_hardware newpkt;
1090 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1092 /* send a packet to myself -- will never get received, of course */
1093 newpkt.source = newpkt.dest = dev->dev_addr[0];
1095 /* only one byte of actual data (and it's random) */
1096 newpkt.offset[0] = 0xFF;
1098 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1100 return 1; /* done */