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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / arcnet / arcnet.c
CommitLineData
1da177e4
LT		 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.
8 *
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
11 *
12 * **********************
13 *
14 * The original copyright was as follows:
15 *
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.
21 *
22 * **********************
23 *
24 * The change log is now in a file called ChangeLog in this directory.
25 *
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>
42 */
43
44#define VERSION "arcnet: v3.93 BETA 2000/04/29 - by Avery Pennarun et al.\n"
45
46#include <linux/module.h>
1da177e4
LT		 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>
ff5688ae 54#include <linux/jiffies.h>
1da177e4
LT		 55
56/* "do nothing" functions for protocol drivers */
57static void null_rx(struct net_device *dev, int bufnum,
58 struct archdr *pkthdr, int length);
59static int null_build_header(struct sk_buff *skb, struct net_device *dev,
60 unsigned short type, uint8_t daddr);
61static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
62 int length, int bufnum);
63
f03aa2d8 64static void arcnet_rx(struct net_device *dev, int bufnum);
1da177e4
LT		 65
66/*
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.
71 */
72 struct ArcProto *arc_proto_map[256], *arc_proto_default,
73 *arc_bcast_proto, *arc_raw_proto;
74
f03aa2d8 75static struct ArcProto arc_proto_null =
1da177e4
LT		 76{
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
85};
86
87/* Exported function prototypes */
88int arcnet_debug = ARCNET_DEBUG;
89
90EXPORT_SYMBOL(arc_proto_map);
91EXPORT_SYMBOL(arc_proto_default);
92EXPORT_SYMBOL(arc_bcast_proto);
93EXPORT_SYMBOL(arc_raw_proto);
1da177e4
LT		 94EXPORT_SYMBOL(arcnet_unregister_proto);
95EXPORT_SYMBOL(arcnet_debug);
96EXPORT_SYMBOL(alloc_arcdev);
97EXPORT_SYMBOL(arcnet_interrupt);
98
99/* Internal function prototypes */
100static int arcnet_open(struct net_device *dev);
101static int arcnet_close(struct net_device *dev);
102static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev);
103static void arcnet_timeout(struct net_device *dev);
104static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
105 unsigned short type, void *daddr, void *saddr,
106 unsigned len);
107static int arcnet_rebuild_header(struct sk_buff *skb);
108static struct net_device_stats *arcnet_get_stats(struct net_device *dev);
109static int go_tx(struct net_device *dev);
110
111static int debug = ARCNET_DEBUG;
112module_param(debug, int, 0);
113MODULE_LICENSE("GPL");
114
115static int __init arcnet_init(void)
116{
117 int count;
118
119 arcnet_debug = debug;
120
f03aa2d8 121 printk("arcnet loaded.\n");
1da177e4
LT		 122
123#ifdef ALPHA_WARNING
124 BUGLVL(D_EXTRA) {
125 printk("arcnet: ***\n"
126 "arcnet: * Read arcnet.txt for important release notes!\n"
127 "arcnet: *\n"
128 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
129 "arcnet: * me if you have any questions, comments, or bug reports.\n"
130 "arcnet: ***\n");
131 }
132#endif
133
134 /* initialize the protocol map */
135 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
136 for (count = 0; count < 256; count++)
137 arc_proto_map[count] = arc_proto_default;
138
139 BUGLVL(D_DURING)
140 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
141 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
142 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
143 sizeof(struct archdr));
144
145 return 0;
146}
147
148static void __exit arcnet_exit(void)
149{
150}
151
152module_init(arcnet_init);
153module_exit(arcnet_exit);
154
155/*
156 * Dump the contents of an sk_buff
157 */
158#if ARCNET_DEBUG_MAX & D_SKB
159void arcnet_dump_skb(struct net_device *dev,
160 struct sk_buff *skb, char *desc)
161{
162 int i;
163
164 printk(KERN_DEBUG "%6s: skb dump (%s) follows:", dev->name, desc);
165 for (i = 0; i < skb->len; i++) {
166 if (i % 16 == 0)
167 printk("\n" KERN_DEBUG "[%04X] ", i);
168 printk("%02X ", ((u_char *) skb->data)[i]);
169 }
170 printk("\n");
171}
172
173EXPORT_SYMBOL(arcnet_dump_skb);
174#endif
175
176
177/*
178 * Dump the contents of an ARCnet buffer
179 */
180#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
f03aa2d8
AB		 181static void arcnet_dump_packet(struct net_device *dev, int bufnum,
182 char *desc, int take_arcnet_lock)
1da177e4
LT		 183{
184 struct arcnet_local *lp = dev->priv;
185 int i, length;
186 unsigned long flags = 0;
187 static uint8_t buf[512];
188
189 /* hw.copy_from_card expects IRQ context so take the IRQ lock
190 to keep it single threaded */
191 if(take_arcnet_lock)
192 spin_lock_irqsave(&lp->lock, flags);
193
194 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
195 if(take_arcnet_lock)
196 spin_unlock_irqrestore(&lp->lock, flags);
197
198 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
199 length = (buf[2] ? 256 : 512);
200
201 printk(KERN_DEBUG "%6s: packet dump (%s) follows:", dev->name, desc);
202 for (i = 0; i < length; i++) {
203 if (i % 16 == 0)
204 printk("\n" KERN_DEBUG "[%04X] ", i);
205 printk("%02X ", buf[i]);
206 }
207 printk("\n");
208
209}
210
f03aa2d8
AB		 211#else
212
213#define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
214
1da177e4
LT		 215#endif
216
217
218/*
219 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
220 * are responsible for registering themselves, but the unregister routine
221 * is pretty generic so we'll do it here.
222 */
223void arcnet_unregister_proto(struct ArcProto *proto)
224{
225 int count;
226
227 if (arc_proto_default == proto)
228 arc_proto_default = &arc_proto_null;
229 if (arc_bcast_proto == proto)
230 arc_bcast_proto = arc_proto_default;
231 if (arc_raw_proto == proto)
232 arc_raw_proto = arc_proto_default;
233
234 for (count = 0; count < 256; count++) {
235 if (arc_proto_map[count] == proto)
236 arc_proto_map[count] = arc_proto_default;
237 }
238}
239
240
241/*
242 * Add a buffer to the queue. Only the interrupt handler is allowed to do
243 * this, unless interrupts are disabled.
244 *
245 * Note: we don't check for a full queue, since there aren't enough buffers
246 * to more than fill it.
247 */
248static void release_arcbuf(struct net_device *dev, int bufnum)
249{
250 struct arcnet_local *lp = dev->priv;
251 int i;
252
253 lp->buf_queue[lp->first_free_buf++] = bufnum;
254 lp->first_free_buf %= 5;
255
256 BUGLVL(D_DURING) {
257 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
258 bufnum);
259 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
260 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
261 BUGMSG2(D_DURING, "\n");
262 }
263}
264
265
266/*
267 * Get a buffer from the queue. If this returns -1, there are no buffers
268 * available.
269 */
270static int get_arcbuf(struct net_device *dev)
271{
272 struct arcnet_local *lp = dev->priv;
273 int buf = -1, i;
274
275 if (!atomic_dec_and_test(&lp->buf_lock)) {
276 /* already in this function */
277 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
278 lp->buf_lock.counter);
279 }
280 else { /* we can continue */
281 if (lp->next_buf >= 5)
282 lp->next_buf -= 5;
283
284 if (lp->next_buf == lp->first_free_buf)
285 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
286 else {
287 buf = lp->buf_queue[lp->next_buf++];
288 lp->next_buf %= 5;
289 }
290 }
291
292
293 BUGLVL(D_DURING) {
294 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
295 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
296 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
297 BUGMSG2(D_DURING, "\n");
298 }
299
300 atomic_inc(&lp->buf_lock);
301 return buf;
302}
303
304
305static int choose_mtu(void)
306{
307 int count, mtu = 65535;
308
309 /* choose the smallest MTU of all available encaps */
310 for (count = 0; count < 256; count++) {
311 if (arc_proto_map[count] != &arc_proto_null
312 && arc_proto_map[count]->mtu < mtu) {
313 mtu = arc_proto_map[count]->mtu;
314 }
315 }
316
317 return mtu == 65535 ? XMTU : mtu;
318}
319
320
321/* Setup a struct device for ARCnet. */
322static void arcdev_setup(struct net_device *dev)
323{
324 dev->type = ARPHRD_ARCNET;
325 dev->hard_header_len = sizeof(struct archdr);
326 dev->mtu = choose_mtu();
327
328 dev->addr_len = ARCNET_ALEN;
329 dev->tx_queue_len = 100;
330 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
331 dev->watchdog_timeo = TX_TIMEOUT;
332
333 /* New-style flags. */
334 dev->flags = IFF_BROADCAST;
335
336 /*
337 * Put in this stuff here, so we don't have to export the symbols to
338 * the chipset drivers.
339 */
340 dev->open = arcnet_open;
341 dev->stop = arcnet_close;
342 dev->hard_start_xmit = arcnet_send_packet;
343 dev->tx_timeout = arcnet_timeout;
344 dev->get_stats = arcnet_get_stats;
345 dev->hard_header = arcnet_header;
346 dev->rebuild_header = arcnet_rebuild_header;
347}
348
349struct net_device *alloc_arcdev(char *name)
350{
351 struct net_device *dev;
352
353 dev = alloc_netdev(sizeof(struct arcnet_local),
354 name && *name ? name : "arc%d", arcdev_setup);
355 if(dev) {
356 struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
357 spin_lock_init(&lp->lock);
358 }
359
360 return dev;
361}
362
363/*
364 * Open/initialize the board. This is called sometime after booting when
365 * the 'ifconfig' program is run.
366 *
367 * This routine should set everything up anew at each open, even registers
368 * that "should" only need to be set once at boot, so that there is
369 * non-reboot way to recover if something goes wrong.
370 */
371static int arcnet_open(struct net_device *dev)
372{
373 struct arcnet_local *lp = dev->priv;
374 int count, newmtu, error;
375
376 BUGMSG(D_INIT,"opened.");
377
378 if (!try_module_get(lp->hw.owner))
379 return -ENODEV;
380
381 BUGLVL(D_PROTO) {
382 int count;
383 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
384 arc_proto_default->suffix);
385 for (count = 0; count < 256; count++)
386 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
387 BUGMSG2(D_PROTO, "\n");
388 }
389
390
391 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
392
393 /* try to put the card in a defined state - if it fails the first
394 * time, actually reset it.
395 */
396 error = -ENODEV;
397 if (ARCRESET(0) && ARCRESET(1))
398 goto out_module_put;
399
400 newmtu = choose_mtu();
401 if (newmtu < dev->mtu)
402 dev->mtu = newmtu;
403
404 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
405
406 /* autodetect the encapsulation for each host. */
407 memset(lp->default_proto, 0, sizeof(lp->default_proto));
408
409 /* the broadcast address is special - use the 'bcast' protocol */
410 for (count = 0; count < 256; count++) {
411 if (arc_proto_map[count] == arc_bcast_proto) {
412 lp->default_proto[0] = count;
413 break;
414 }
415 }
416
417 /* initialize buffers */
418 atomic_set(&lp->buf_lock, 1);
419
420 lp->next_buf = lp->first_free_buf = 0;
421 release_arcbuf(dev, 0);
422 release_arcbuf(dev, 1);
423 release_arcbuf(dev, 2);
424 release_arcbuf(dev, 3);
425 lp->cur_tx = lp->next_tx = -1;
426 lp->cur_rx = -1;
427
428 lp->rfc1201.sequence = 1;
429
430 /* bring up the hardware driver */
431 if (lp->hw.open)
432 lp->hw.open(dev);
433
434 if (dev->dev_addr[0] == 0)
435 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
436 "for broadcasts!\n");
437 else if (dev->dev_addr[0] == 255)
438 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
439 "DOS networking programs!\n");
440
441 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
442 if (ASTATUS() & RESETflag) {
443 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
444 ACOMMAND(CFLAGScmd | RESETclear);
445 }
446
447
448 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
449 /* make sure we're ready to receive IRQ's. */
450 AINTMASK(0);
451 udelay(1); /* give it time to set the mask before
452 * we reset it again. (may not even be
453 * necessary)
454 */
455 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
456 lp->intmask = NORXflag | RECONflag;
457 AINTMASK(lp->intmask);
458 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
459
460 netif_start_queue(dev);
461
462 return 0;
463
464 out_module_put:
465 module_put(lp->hw.owner);
466 return error;
467}
468
469
470/* The inverse routine to arcnet_open - shuts down the card. */
471static int arcnet_close(struct net_device *dev)
472{
473 struct arcnet_local *lp = dev->priv;
474
475 netif_stop_queue(dev);
476
477 /* flush TX and disable RX */
478 AINTMASK(0);
479 ACOMMAND(NOTXcmd); /* stop transmit */
480 ACOMMAND(NORXcmd); /* disable receive */
481 mdelay(1);
482
483 /* shut down the card */
484 lp->hw.close(dev);
485 module_put(lp->hw.owner);
486 return 0;
487}
488
489
490static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
491 unsigned short type, void *daddr, void *saddr,
492 unsigned len)
493{
494 struct arcnet_local *lp = dev->priv;
495 uint8_t _daddr, proto_num;
496 struct ArcProto *proto;
497
498 BUGMSG(D_DURING,
499 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
500 saddr ? *(uint8_t *) saddr : -1,
501 daddr ? *(uint8_t *) daddr : -1,
502 type, type, len);
503
504 if (skb->len!=0 && len != skb->len)
505 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
506 skb->len, len);
507
508
509 /* Type is host order - ? */
510 if(type == ETH_P_ARCNET) {
511 proto = arc_raw_proto;
512 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
513 _daddr = daddr ? *(uint8_t *) daddr : 0;
514 }
515 else if (!daddr) {
516 /*
517 * if the dest addr isn't provided, we can't choose an encapsulation!
518 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
519 * real header when we do rebuild_header.
520 */
521 *(uint16_t *) skb_push(skb, 2) = type;
522 if (skb->nh.raw - skb->mac.raw != 2)
523 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
524 (int)(skb->nh.raw - skb->mac.raw));
525 return -2; /* return error -- can't transmit yet! */
526 }
527 else {
528 /* otherwise, we can just add the header as usual. */
529 _daddr = *(uint8_t *) daddr;
530 proto_num = lp->default_proto[_daddr];
531 proto = arc_proto_map[proto_num];
532 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
533 proto_num, proto->suffix);
534 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
535 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
536 arc_bcast_proto->suffix);
537 proto = arc_bcast_proto;
538 }
539 }
540 return proto->build_header(skb, dev, type, _daddr);
541}
542
543
544/*
545 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
546 * future other address resolution) has completed on this sk_buff. We now
547 * let ARP fill in the destination field.
548 */
549static int arcnet_rebuild_header(struct sk_buff *skb)
550{
551 struct net_device *dev = skb->dev;
552 struct arcnet_local *lp = dev->priv;
553 int status = 0; /* default is failure */
554 unsigned short type;
555 uint8_t daddr=0;
556 struct ArcProto *proto;
557
558 if (skb->nh.raw - skb->mac.raw != 2) {
559 BUGMSG(D_NORMAL,
560 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
561 (int)(skb->nh.raw - skb->mac.raw));
562 return 0;
563 }
564 type = *(uint16_t *) skb_pull(skb, 2);
565 BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
566
567 if (type == ETH_P_IP) {
568#ifdef CONFIG_INET
569 BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
570 status = arp_find(&daddr, skb) ? 1 : 0;
571 BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
572 daddr, type);
573#endif
574 } else {
575 BUGMSG(D_NORMAL,
576 "I don't understand ethernet protocol %Xh addresses!\n", type);
577 lp->stats.tx_errors++;
578 lp->stats.tx_aborted_errors++;
579 }
580
581 /* if we couldn't resolve the address... give up. */
582 if (!status)
583 return 0;
584
585 /* add the _real_ header this time! */
586 proto = arc_proto_map[lp->default_proto[daddr]];
587 proto->build_header(skb, dev, type, daddr);
588
589 return 1; /* success */
590}
591
592
593
594/* Called by the kernel in order to transmit a packet. */
595static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev)
596{
597 struct arcnet_local *lp = dev->priv;
598 struct archdr *pkt;
599 struct arc_rfc1201 *soft;
600 struct ArcProto *proto;
601 int txbuf;
602 unsigned long flags;
c6bb15a0 603 int freeskb, retval;
1da177e4
LT		 604
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);
608
609 pkt = (struct archdr *) skb->data;
610 soft = &pkt->soft.rfc1201;
611 proto = arc_proto_map[soft->proto];
612
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");
616
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);
c6bb15a0 621 return NETDEV_TX_OK; /* don't try again */
1da177e4
LT		 622 }
623
624 /* We're busy transmitting a packet... */
625 netif_stop_queue(dev);
626
627 spin_lock_irqsave(&lp->lock, flags);
628 AINTMASK(0);
c6bb15a0
PD		 629 if(lp->next_tx == -1)
630 txbuf = get_arcbuf(dev);
631 else {
632 txbuf = -1;
633 }
1da177e4
LT		 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 lp->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;
646
c6bb15a0
PD		 647 freeskb = 0;
648
1da177e4
LT		 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);
654 }
655 }
c6bb15a0
PD		 656 retval = NETDEV_TX_OK;
657 dev->trans_start = jiffies;
1da177e4
LT		 658 lp->next_tx = txbuf;
659 } else {
c6bb15a0
PD		 660 retval = NETDEV_TX_BUSY;
661 freeskb = 0;
1da177e4
LT		 662 }
663
664 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS());
665 /* make sure we didn't ignore a TX IRQ while we were in here */
666 AINTMASK(0);
667
668 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
669 lp->intmask |= TXFREEflag|EXCNAKflag;
670 AINTMASK(lp->intmask);
671 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS());
672
673 spin_unlock_irqrestore(&lp->lock, flags);
674 if (freeskb) {
675 dev_kfree_skb(skb);
676 }
c6bb15a0 677 return retval; /* no need to try again */
1da177e4
LT		 678}
679
680
681/*
682 * Actually start transmitting a packet that was loaded into a buffer
683 * by prepare_tx. This should _only_ be called by the interrupt handler.
684 */
685static int go_tx(struct net_device *dev)
686{
687 struct arcnet_local *lp = dev->priv;
688
689 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
690 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
691
692 if (lp->cur_tx != -1 || lp->next_tx == -1)
693 return 0;
694
695 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
696
697 lp->cur_tx = lp->next_tx;
698 lp->next_tx = -1;
699
700 /* start sending */
701 ACOMMAND(TXcmd | (lp->cur_tx << 3));
702
1da177e4
LT		 703 lp->stats.tx_packets++;
704 lp->lasttrans_dest = lp->lastload_dest;
705 lp->lastload_dest = 0;
706 lp->excnak_pending = 0;
707 lp->intmask |= TXFREEflag|EXCNAKflag;
708
709 return 1;
710}
711
712
713/* Called by the kernel when transmit times out */
714static void arcnet_timeout(struct net_device *dev)
715{
716 unsigned long flags;
717 struct arcnet_local *lp = dev->priv;
718 int status = ASTATUS();
719 char *msg;
720
721 spin_lock_irqsave(&lp->lock, flags);
722 if (status & TXFREEflag) { /* transmit _DID_ finish */
723 msg = " - missed IRQ?";
724 } else {
725 msg = "";
726 lp->stats.tx_aborted_errors++;
727 lp->timed_out = 1;
728 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
729 }
730 lp->stats.tx_errors++;
731
732 /* make sure we didn't miss a TX or a EXC NAK IRQ */
733 AINTMASK(0);
734 lp->intmask |= TXFREEflag|EXCNAKflag;
735 AINTMASK(lp->intmask);
736
737 spin_unlock_irqrestore(&lp->lock, flags);
738
ff5688ae 739 if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
1da177e4
LT		 740 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
741 msg, status, lp->intmask, lp->lasttrans_dest);
742 lp->last_timeout = jiffies;
743 }
744
745 if (lp->cur_tx == -1)
746 netif_wake_queue(dev);
747}
748
749
750/*
751 * The typical workload of the driver: Handle the network interface
752 * interrupts. Establish which device needs attention, and call the correct
753 * chipset interrupt handler.
754 */
7d12e780 755irqreturn_t arcnet_interrupt(int irq, void *dev_id)
1da177e4
LT		 756{
757 struct net_device *dev = dev_id;
758 struct arcnet_local *lp;
759 int recbuf, status, diagstatus, didsomething, boguscount;
760 int retval = IRQ_NONE;
761
762 BUGMSG(D_DURING, "\n");
763
764 BUGMSG(D_DURING, "in arcnet_interrupt\n");
765
766 lp = dev->priv;
5d9428de 767 BUG_ON(!lp);
1da177e4
LT		 768
769 spin_lock(&lp->lock);
770
771 /*
772 * RESET flag was enabled - if device is not running, we must clear it right
773 * away (but nothing else).
774 */
775 if (!netif_running(dev)) {
776 if (ASTATUS() & RESETflag)
777 ACOMMAND(CFLAGScmd | RESETclear);
778 AINTMASK(0);
779 spin_unlock(&lp->lock);
780 return IRQ_HANDLED;
781 }
782
783 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
784 ASTATUS(), lp->intmask);
785
786 boguscount = 5;
787 do {
788 status = ASTATUS();
789 diagstatus = (status >> 8) & 0xFF;
790
791 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
792 __FILE__,__LINE__,__FUNCTION__,status);
793 didsomething = 0;
794
795 /*
796 * RESET flag was enabled - card is resetting and if RX is
797 * disabled, it's NOT because we just got a packet.
798 *
799 * The card is in an undefined state. Clear it out and start over.
800 */
801 if (status & RESETflag) {
802 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
803 arcnet_close(dev);
804 arcnet_open(dev);
805
806 /* get out of the interrupt handler! */
807 break;
808 }
809 /*
810 * RX is inhibited - we must have received something. Prepare to
811 * receive into the next buffer.
812 *
813 * We don't actually copy the received packet from the card until
814 * after the transmit handler runs (and possibly launches the next
815 * tx); this should improve latency slightly if we get both types
816 * of interrupts at once.
817 */
818 recbuf = -1;
819 if (status & lp->intmask & NORXflag) {
820 recbuf = lp->cur_rx;
821 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
822 recbuf, status);
823
824 lp->cur_rx = get_arcbuf(dev);
825 if (lp->cur_rx != -1) {
826 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
827 lp->cur_rx);
828 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
829 }
830 didsomething++;
831 }
832
833 if((diagstatus & EXCNAKflag)) {
834 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
835 diagstatus);
836
837 ACOMMAND(NOTXcmd); /* disable transmit */
838 lp->excnak_pending = 1;
839
840 ACOMMAND(EXCNAKclear);
841 lp->intmask &= ~(EXCNAKflag);
842 didsomething++;
843 }
844
845
846 /* a transmit finished, and we're interested in it. */
847 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
848 lp->intmask &= ~(TXFREEflag|EXCNAKflag);
849
850 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
851
852 if (lp->cur_tx != -1 && !lp->timed_out) {
853 if(!(status & TXACKflag)) {
854 if (lp->lasttrans_dest != 0) {
855 BUGMSG(D_EXTRA,
856 "transmit was not acknowledged! "
857 "(status=%Xh, dest=%02Xh)\n",
858 status, lp->lasttrans_dest);
859 lp->stats.tx_errors++;
860 lp->stats.tx_carrier_errors++;
861 } else {
862 BUGMSG(D_DURING,
863 "broadcast was not acknowledged; that's normal "
864 "(status=%Xh, dest=%02Xh)\n",
865 status, lp->lasttrans_dest);
866 }
867 }
868
869 if (lp->outgoing.proto &&
870 lp->outgoing.proto->ack_tx) {
871 int ackstatus;
872 if(status & TXACKflag)
873 ackstatus=2;
874 else if(lp->excnak_pending)
875 ackstatus=1;
876 else
877 ackstatus=0;
878
879 lp->outgoing.proto
880 ->ack_tx(dev, ackstatus);
881 }
882 }
883 if (lp->cur_tx != -1)
884 release_arcbuf(dev, lp->cur_tx);
885
886 lp->cur_tx = -1;
887 lp->timed_out = 0;
888 didsomething++;
889
890 /* send another packet if there is one */
891 go_tx(dev);
892
893 /* continue a split packet, if any */
894 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
895 int txbuf = get_arcbuf(dev);
896 if (txbuf != -1) {
897 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
898 /* that was the last segment */
899 lp->stats.tx_bytes += lp->outgoing.skb->len;
900 if(!lp->outgoing.proto->ack_tx)
901 {
902 dev_kfree_skb_irq(lp->outgoing.skb);
903 lp->outgoing.proto = NULL;
904 }
905 }
906 lp->next_tx = txbuf;
907 }
908 }
909 /* inform upper layers of idleness, if necessary */
910 if (lp->cur_tx == -1)
911 netif_wake_queue(dev);
912 }
913 /* now process the received packet, if any */
914 if (recbuf != -1) {
915 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
916
917 arcnet_rx(dev, recbuf);
918 release_arcbuf(dev, recbuf);
919
920 didsomething++;
921 }
922 if (status & lp->intmask & RECONflag) {
923 ACOMMAND(CFLAGScmd | CONFIGclear);
924 lp->stats.tx_carrier_errors++;
925
926 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
927 status);
c6bb15a0
PD		 928 /* MYRECON bit is at bit 7 of diagstatus */
929 if(diagstatus & 0x80)
930 BUGMSG(D_RECON,"Put out that recon myself\n");
1da177e4
LT		 931
932 /* is the RECON info empty or old? */
933 if (!lp->first_recon || !lp->last_recon ||
934 jiffies - lp->last_recon > HZ * 10) {
935 if (lp->network_down)
936 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
937 lp->first_recon = lp->last_recon = jiffies;
938 lp->num_recons = lp->network_down = 0;
939
940 BUGMSG(D_DURING, "recon: clearing counters.\n");
941 } else { /* add to current RECON counter */
942 lp->last_recon = jiffies;
943 lp->num_recons++;
944
945 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
946 lp->num_recons,
947 (lp->last_recon - lp->first_recon) / HZ,
948 lp->network_down);
949
950 /* if network is marked up;
951 * and first_recon and last_recon are 60+ apart;
952 * and the average no. of recons counted is
953 * > RECON_THRESHOLD/min;
954 * then print a warning message.
955 */
956 if (!lp->network_down
957 && (lp->last_recon - lp->first_recon) <= HZ * 60
958 && lp->num_recons >= RECON_THRESHOLD) {
959 lp->network_down = 1;
960 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
961 } else if (!lp->network_down
962 && lp->last_recon - lp->first_recon > HZ * 60) {
963 /* reset counters if we've gone for over a minute. */
964 lp->first_recon = lp->last_recon;
965 lp->num_recons = 1;
966 }
967 }
968 } else if (lp->network_down && 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;
973
974 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
975 }
976
977 if(didsomething) {
978 retval |= IRQ_HANDLED;
979 }
980 }
981 while (--boguscount && didsomething);
982
983 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
984 ASTATUS(), boguscount);
985 BUGMSG(D_DURING, "\n");
986
987
988 AINTMASK(0);
989 udelay(1);
990 AINTMASK(lp->intmask);
991
992 spin_unlock(&lp->lock);
993 return retval;
994}
995
996
997/*
998 * This is a generic packet receiver that calls arcnet??_rx depending on the
999 * protocol ID found.
1000 */
f03aa2d8 1001static void arcnet_rx(struct net_device *dev, int bufnum)
1da177e4
LT		 1002{
1003 struct arcnet_local *lp = dev->priv;
1004 struct archdr pkt;
1005 struct arc_rfc1201 *soft;
1006 int length, ofs;
1007
1008 soft = &pkt.soft.rfc1201;
1009
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;
1017 }
1018
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);
1025 }
1026
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);
1030
1031 lp->stats.rx_packets++;
1032 lp->stats.rx_bytes += length + ARC_HDR_SIZE;
1033
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];
1040
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);
1046 }
1047 }
1048
1049 /* broadcasts will always be done with the last-used encap. */
1050 lp->default_proto[0] = soft->proto;
1051
1052 /* in striking contrast, the following isn't a hack. */
1053 lp->default_proto[pkt.hard.source] = soft->proto;
1054 }
1055 /* call the protocol-specific receiver. */
1056 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1057}
1058
1059
1060
1061/*
1062 * Get the current statistics. This may be called with the card open or
1063 * closed.
1064 */
1065static struct net_device_stats *arcnet_get_stats(struct net_device *dev)
1066{
1067 struct arcnet_local *lp = dev->priv;
1068 return &lp->stats;
1069}
1070
1071
1072static void null_rx(struct net_device *dev, int bufnum,
1073 struct archdr *pkthdr, int length)
1074{
1075 BUGMSG(D_PROTO,
1076 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1077 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1078}
1079
1080
1081static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1082 unsigned short type, uint8_t daddr)
1083{
1084 struct arcnet_local *lp = dev->priv;
1085
1086 BUGMSG(D_PROTO,
1087 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1088 lp->default_proto[daddr]);
1089
1090 /* always fails */
1091 return 0;
1092}
1093
1094
1095/* the "do nothing" prepare_tx function warns that there's nothing to do. */
1096static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1097 int length, int bufnum)
1098{
1099 struct arcnet_local *lp = dev->priv;
1100 struct arc_hardware newpkt;
1101
1102 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1103
1104 /* send a packet to myself -- will never get received, of course */
1105 newpkt.source = newpkt.dest = dev->dev_addr[0];
1106
1107 /* only one byte of actual data (and it's random) */
1108 newpkt.offset[0] = 0xFF;
1109
1110 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1111
1112 return 1; /* done */
1113}
kernel source for telekom puls (alcatel/mediatek)