1 /* 3c501.c: A 3Com 3c501 Ethernet driver for Linux. */
2 /*
3 Written 1992,1993,1994 Donald Becker
4
5 Copyright 1993 United States Government as represented by the
6 Director, National Security Agency. This software may be used and
7 distributed according to the terms of the GNU General Public License,
8 incorporated herein by reference.
9
10 This is a device driver for the 3Com Etherlink 3c501.
11 Do not purchase this card, even as a joke. It's performance is horrible,
12 and it breaks in many ways.
13
14 The original author may be reached as becker@scyld.com, or C/O
15 Scyld Computing Corporation
16 410 Severn Ave., Suite 210
17 Annapolis MD 21403
18
19 Fixed (again!) the missing interrupt locking on TX/RX shifting.
20 Alan Cox <Alan.Cox@linux.org>
21
22 Removed calls to init_etherdev since they are no longer needed, and
23 cleaned up modularization just a bit. The driver still allows only
24 the default address for cards when loaded as a module, but that's
25 really less braindead than anyone using a 3c501 board. :)
26 19950208 (invid@msen.com)
27
28 Added traps for interrupts hitting the window as we clear and TX load
29 the board. Now getting 150K/second FTP with a 3c501 card. Still playing
30 with a TX-TX optimisation to see if we can touch 180-200K/second as seems
31 theoretically maximum.
32 19950402 Alan Cox <Alan.Cox@linux.org>
33
34 Cleaned up for 2.3.x because we broke SMP now.
35 20000208 Alan Cox <alan@redhat.com>
36
37 Check up pass for 2.5. Nothing significant changed
38 20021009 Alan Cox <alan@redhat.com>
39
40 Fixed zero fill corner case
41 20030104 Alan Cox <alan@redhat.com>
42
43
44 For the avoidance of doubt the "preferred form" of this code is one which
45 is in an open non patent encumbered format. Where cryptographic key signing
46 forms part of the process of creating an executable the information
47 including keys needed to generate an equivalently functional executable
48 are deemed to be part of the source code.
49
50 */
51
52
53 /**
54 * DOC: 3c501 Card Notes
55 *
56 * Some notes on this thing if you have to hack it. [Alan]
57 *
58 * Some documentation is available from 3Com. Due to the boards age
59 * standard responses when you ask for this will range from 'be serious'
60 * to 'give it to a museum'. The documentation is incomplete and mostly
61 * of historical interest anyway.
62 *
63 * The basic system is a single buffer which can be used to receive or
64 * transmit a packet. A third command mode exists when you are setting
65 * things up.
66 *
67 * If it's transmitting it's not receiving and vice versa. In fact the
68 * time to get the board back into useful state after an operation is
69 * quite large.
70 *
71 * The driver works by keeping the board in receive mode waiting for a
72 * packet to arrive. When one arrives it is copied out of the buffer
73 * and delivered to the kernel. The card is reloaded and off we go.
74 *
75 * When transmitting lp->txing is set and the card is reset (from
76 * receive mode) [possibly losing a packet just received] to command
77 * mode. A packet is loaded and transmit mode triggered. The interrupt
78 * handler runs different code for transmit interrupts and can handle
79 * returning to receive mode or retransmissions (yes you have to help
80 * out with those too).
81 *
82 * DOC: Problems
83 *
84 * There are a wide variety of undocumented error returns from the card
85 * and you basically have to kick the board and pray if they turn up. Most
86 * only occur under extreme load or if you do something the board doesn't
87 * like (eg touching a register at the wrong time).
88 *
89 * The driver is less efficient than it could be. It switches through
90 * receive mode even if more transmits are queued. If this worries you buy
91 * a real Ethernet card.
92 *
93 * The combination of slow receive restart and no real multicast
94 * filter makes the board unusable with a kernel compiled for IP
95 * multicasting in a real multicast environment. That's down to the board,
96 * but even with no multicast programs running a multicast IP kernel is
97 * in group 224.0.0.1 and you will therefore be listening to all multicasts.
98 * One nv conference running over that Ethernet and you can give up.
99 *
100 */
101
102 #define DRV_NAME "3c501"
103 #define DRV_VERSION "2002/10/09"
104
105
106 static const char version[] =
107 DRV_NAME ".c: " DRV_VERSION " Alan Cox (alan@redhat.com).\n";
108
109 /*
110 * Braindamage remaining:
111 * The 3c501 board.
112 */
113
114 #include <linux/module.h>
115
116 #include <linux/kernel.h>
117 #include <linux/fcntl.h>
118 #include <linux/ioport.h>
119 #include <linux/interrupt.h>
120 #include <linux/slab.h>
121 #include <linux/string.h>
122 #include <linux/errno.h>
123 #include <linux/spinlock.h>
124 #include <linux/ethtool.h>
125 #include <linux/delay.h>
126 #include <linux/bitops.h>
127
128 #include <asm/uaccess.h>
129 #include <asm/io.h>
130
131 #include <linux/netdevice.h>
132 #include <linux/etherdevice.h>
133 #include <linux/skbuff.h>
134 #include <linux/init.h>
135
136 #include "3c501.h"
137
138 /*
139 * The boilerplate probe code.
140 */
141
142 static int io=0x280;
143 static int irq=5;
144 static int mem_start;
145
146 /**
147 * el1_probe: - probe for a 3c501
148 * @dev: The device structure passed in to probe.
149 *
150 * This can be called from two places. The network layer will probe using
151 * a device structure passed in with the probe information completed. For a
152 * modular driver we use #init_module to fill in our own structure and probe
153 * for it.
154 *
155 * Returns 0 on success. ENXIO if asked not to probe and ENODEV if asked to
156 * probe and failing to find anything.
157 */
158
159 struct net_device * __init el1_probe(int unit)
160 {
161 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
162 static unsigned ports[] = { 0x280, 0x300, 0};
163 unsigned *port;
164 int err = 0;
165
166 if (!dev)
167 return ERR_PTR(-ENOMEM);
168
169 if (unit >= 0) {
170 sprintf(dev->name, "eth%d", unit);
171 netdev_boot_setup_check(dev);
172 io = dev->base_addr;
173 irq = dev->irq;
174 mem_start = dev->mem_start & 7;
175 }
176
177 SET_MODULE_OWNER(dev);
178
179 if (io > 0x1ff) { /* Check a single specified location. */
180 err = el1_probe1(dev, io);
181 } else if (io != 0) {
182 err = -ENXIO; /* Don't probe at all. */
183 } else {
184 for (port = ports; *port && el1_probe1(dev, *port); port++)
185 ;
186 if (!*port)
187 err = -ENODEV;
188 }
189 if (err)
190 goto out;
191 err = register_netdev(dev);
192 if (err)
193 goto out1;
194 return dev;
195 out1:
196 release_region(dev->base_addr, EL1_IO_EXTENT);
197 out:
198 free_netdev(dev);
199 return ERR_PTR(err);
200 }
201
202 /**
203 * el1_probe1:
204 * @dev: The device structure to use
205 * @ioaddr: An I/O address to probe at.
206 *
207 * The actual probe. This is iterated over by #el1_probe in order to
208 * check all the applicable device locations.
209 *
210 * Returns 0 for a success, in which case the device is activated,
211 * EAGAIN if the IRQ is in use by another driver, and ENODEV if the
212 * board cannot be found.
213 */
214
215 static int __init el1_probe1(struct net_device *dev, int ioaddr)
216 {
217 struct net_local *lp;
218 const char *mname; /* Vendor name */
219 unsigned char station_addr[6];
220 int autoirq = 0;
221 int i;
222
223 /*
224 * Reserve I/O resource for exclusive use by this driver
225 */
226
227 if (!request_region(ioaddr, EL1_IO_EXTENT, DRV_NAME))
228 return -ENODEV;
229
230 /*
231 * Read the station address PROM data from the special port.
232 */
233
234 for (i = 0; i < 6; i++)
235 {
236 outw(i, ioaddr + EL1_DATAPTR);
237 station_addr[i] = inb(ioaddr + EL1_SAPROM);
238 }
239 /*
240 * Check the first three octets of the S.A. for 3Com's prefix, or
241 * for the Sager NP943 prefix.
242 */
243
244 if (station_addr[0] == 0x02 && station_addr[1] == 0x60
245 && station_addr[2] == 0x8c)
246 {
247 mname = "3c501";
248 } else if (station_addr[0] == 0x00 && station_addr[1] == 0x80
249 && station_addr[2] == 0xC8)
250 {
251 mname = "NP943";
252 }
253 else {
254 release_region(ioaddr, EL1_IO_EXTENT);
255 return -ENODEV;
256 }
257
258 /*
259 * We auto-IRQ by shutting off the interrupt line and letting it float
260 * high.
261 */
262
263 dev->irq = irq;
264
265 if (dev->irq < 2)
266 {
267 unsigned long irq_mask;
268
269 irq_mask = probe_irq_on();
270 inb(RX_STATUS); /* Clear pending interrupts. */
271 inb(TX_STATUS);
272 outb(AX_LOOP + 1, AX_CMD);
273
274 outb(0x00, AX_CMD);
275
276 mdelay(20);
277 autoirq = probe_irq_off(irq_mask);
278
279 if (autoirq == 0)
280 {
281 printk(KERN_WARNING "%s probe at %#x failed to detect IRQ line.\n",
282 mname, ioaddr);
283 release_region(ioaddr, EL1_IO_EXTENT);
284 return -EAGAIN;
285 }
286 }
287
288 outb(AX_RESET+AX_LOOP, AX_CMD); /* Loopback mode. */
289 dev->base_addr = ioaddr;
290 memcpy(dev->dev_addr, station_addr, ETH_ALEN);
291
292 if (mem_start & 0xf)
293 el_debug = mem_start & 0x7;
294 if (autoirq)
295 dev->irq = autoirq;
296
297 printk(KERN_INFO "%s: %s EtherLink at %#lx, using %sIRQ %d.\n", dev->name, mname, dev->base_addr,
298 autoirq ? "auto":"assigned ", dev->irq);
299
300 #ifdef CONFIG_IP_MULTICAST
301 printk(KERN_WARNING "WARNING: Use of the 3c501 in a multicast kernel is NOT recommended.\n");
302 #endif
303
304 if (el_debug)
305 printk(KERN_DEBUG "%s", version);
306
307 memset(dev->priv, 0, sizeof(struct net_local));
308 lp = netdev_priv(dev);
309 spin_lock_init(&lp->lock);
310
311 /*
312 * The EL1-specific entries in the device structure.
313 */
314
315 dev->open = &el_open;
316 dev->hard_start_xmit = &el_start_xmit;
317 dev->tx_timeout = &el_timeout;
318 dev->watchdog_timeo = HZ;
319 dev->stop = &el1_close;
320 dev->get_stats = &el1_get_stats;
321 dev->set_multicast_list = &set_multicast_list;
322 dev->ethtool_ops = &netdev_ethtool_ops;
323 return 0;
324 }
325
326 /**
327 * el1_open:
328 * @dev: device that is being opened
329 *
330 * When an ifconfig is issued which changes the device flags to include
331 * IFF_UP this function is called. It is only called when the change
332 * occurs, not when the interface remains up. #el1_close will be called
333 * when it goes down.
334 *
335 * Returns 0 for a successful open, or -EAGAIN if someone has run off
336 * with our interrupt line.
337 */
338
339 static int el_open(struct net_device *dev)
340 {
341 int retval;
342 int ioaddr = dev->base_addr;
343 struct net_local *lp = netdev_priv(dev);
344 unsigned long flags;
345
346 if (el_debug > 2)
347 printk(KERN_DEBUG "%s: Doing el_open()...", dev->name);
348
349 if ((retval = request_irq(dev->irq, &el_interrupt, 0, dev->name, dev)))
350 return retval;
351
352 spin_lock_irqsave(&lp->lock, flags);
353 el_reset(dev);
354 spin_unlock_irqrestore(&lp->lock, flags);
355
356 lp->txing = 0; /* Board in RX mode */
357 outb(AX_RX, AX_CMD); /* Aux control, irq and receive enabled */
358 netif_start_queue(dev);
359 return 0;
360 }
361
362 /**
363 * el_timeout:
364 * @dev: The 3c501 card that has timed out
365 *
366 * Attempt to restart the board. This is basically a mixture of extreme
367 * violence and prayer
368 *
369 */
370
371 static void el_timeout(struct net_device *dev)
372 {
373 struct net_local *lp = netdev_priv(dev);
374 int ioaddr = dev->base_addr;
375
376 if (el_debug)
377 printk (KERN_DEBUG "%s: transmit timed out, txsr %#2x axsr=%02x rxsr=%02x.\n",
378 dev->name, inb(TX_STATUS), inb(AX_STATUS), inb(RX_STATUS));
379 lp->stats.tx_errors++;
380 outb(TX_NORM, TX_CMD);
381 outb(RX_NORM, RX_CMD);
382 outb(AX_OFF, AX_CMD); /* Just trigger a false interrupt. */
383 outb(AX_RX, AX_CMD); /* Aux control, irq and receive enabled */
384 lp->txing = 0; /* Ripped back in to RX */
385 netif_wake_queue(dev);
386 }
387
388
389 /**
390 * el_start_xmit:
391 * @skb: The packet that is queued to be sent
392 * @dev: The 3c501 card we want to throw it down
393 *
394 * Attempt to send a packet to a 3c501 card. There are some interesting
395 * catches here because the 3c501 is an extremely old and therefore
396 * stupid piece of technology.
397 *
398 * If we are handling an interrupt on the other CPU we cannot load a packet
399 * as we may still be attempting to retrieve the last RX packet buffer.
400 *
401 * When a transmit times out we dump the card into control mode and just
402 * start again. It happens enough that it isnt worth logging.
403 *
404 * We avoid holding the spin locks when doing the packet load to the board.
405 * The device is very slow, and its DMA mode is even slower. If we held the
406 * lock while loading 1500 bytes onto the controller we would drop a lot of
407 * serial port characters. This requires we do extra locking, but we have
408 * no real choice.
409 */
410
411 static int el_start_xmit(struct sk_buff *skb, struct net_device *dev)
412 {
413 struct net_local *lp = netdev_priv(dev);
414 int ioaddr = dev->base_addr;
415 unsigned long flags;
416
417 /*
418 * Avoid incoming interrupts between us flipping txing and flipping
419 * mode as the driver assumes txing is a faithful indicator of card
420 * state
421 */
422
423 spin_lock_irqsave(&lp->lock, flags);
424
425 /*
426 * Avoid timer-based retransmission conflicts.
427 */
428
429 netif_stop_queue(dev);
430
431 do
432 {
433 int len = skb->len;
434 int pad = 0;
435 int gp_start;
436 unsigned char *buf = skb->data;
437
438 if (len < ETH_ZLEN)
439 pad = ETH_ZLEN - len;
440
441 gp_start = 0x800 - ( len + pad );
442
443 lp->tx_pkt_start = gp_start;
444 lp->collisions = 0;
445
446 lp->stats.tx_bytes += skb->len;
447
448 /*
449 * Command mode with status cleared should [in theory]
450 * mean no more interrupts can be pending on the card.
451 */
452
453 outb_p(AX_SYS, AX_CMD);
454 inb_p(RX_STATUS);
455 inb_p(TX_STATUS);
456
457 lp->loading = 1;
458 lp->txing = 1;
459
460 /*
461 * Turn interrupts back on while we spend a pleasant afternoon
462 * loading bytes into the board
463 */
464
465 spin_unlock_irqrestore(&lp->lock, flags);
466
467 outw(0x00, RX_BUF_CLR); /* Set rx packet area to 0. */
468 outw(gp_start, GP_LOW); /* aim - packet will be loaded into buffer start */
469 outsb(DATAPORT,buf,len); /* load buffer (usual thing each byte increments the pointer) */
470 if (pad) {
471 while(pad--) /* Zero fill buffer tail */
472 outb(0, DATAPORT);
473 }
474 outw(gp_start, GP_LOW); /* the board reuses the same register */
475
476 if(lp->loading != 2)
477 {
478 outb(AX_XMIT, AX_CMD); /* fire ... Trigger xmit. */
479 lp->loading=0;
480 dev->trans_start = jiffies;
481 if (el_debug > 2)
482 printk(KERN_DEBUG " queued xmit.\n");
483 dev_kfree_skb (skb);
484 return 0;
485 }
486 /* A receive upset our load, despite our best efforts */
487 if(el_debug>2)
488 printk(KERN_DEBUG "%s: burped during tx load.\n", dev->name);
489 spin_lock_irqsave(&lp->lock, flags);
490 }
491 while(1);
492
493 }
494
495 /**
496 * el_interrupt:
497 * @irq: Interrupt number
498 * @dev_id: The 3c501 that burped
499 * @regs: Register data (surplus to our requirements)
500 *
501 * Handle the ether interface interrupts. The 3c501 needs a lot more
502 * hand holding than most cards. In particular we get a transmit interrupt
503 * with a collision error because the board firmware isnt capable of rewinding
504 * its own transmit buffer pointers. It can however count to 16 for us.
505 *
506 * On the receive side the card is also very dumb. It has no buffering to
507 * speak of. We simply pull the packet out of its PIO buffer (which is slow)
508 * and queue it for the kernel. Then we reset the card for the next packet.
509 *
510 * We sometimes get surprise interrupts late both because the SMP IRQ delivery
511 * is message passing and because the card sometimes seems to deliver late. I
512 * think if it is part way through a receive and the mode is changed it carries
513 * on receiving and sends us an interrupt. We have to band aid all these cases
514 * to get a sensible 150kBytes/second performance. Even then you want a small
515 * TCP window.
516 */
517
518 static irqreturn_t el_interrupt(int irq, void *dev_id, struct pt_regs *regs)
519 {
520 struct net_device *dev = dev_id;
521 struct net_local *lp;
522 int ioaddr;
523 int axsr; /* Aux. status reg. */
524
525 ioaddr = dev->base_addr;
526 lp = netdev_priv(dev);
527
528 spin_lock(&lp->lock);
529
530 /*
531 * What happened ?
532 */
533
534 axsr = inb(AX_STATUS);
535
536 /*
537 * Log it
538 */
539
540 if (el_debug > 3)
541 printk(KERN_DEBUG "%s: el_interrupt() aux=%#02x", dev->name, axsr);
542
543 if(lp->loading==1 && !lp->txing)
544 printk(KERN_WARNING "%s: Inconsistent state loading while not in tx\n",
545 dev->name);
546
547 if (lp->txing)
548 {
549
550 /*
551 * Board in transmit mode. May be loading. If we are
552 * loading we shouldn't have got this.
553 */
554
555 int txsr = inb(TX_STATUS);
556
557 if(lp->loading==1)
558 {
559 if(el_debug > 2)
560 {
561 printk(KERN_DEBUG "%s: Interrupt while loading [", dev->name);
562 printk(KERN_DEBUG " txsr=%02x gp=%04x rp=%04x]\n", txsr, inw(GP_LOW),inw(RX_LOW));
563 }
564 lp->loading=2; /* Force a reload */
565 spin_unlock(&lp->lock);
566 goto out;
567 }
568
569 if (el_debug > 6)
570 printk(KERN_DEBUG " txsr=%02x gp=%04x rp=%04x", txsr, inw(GP_LOW),inw(RX_LOW));
571
572 if ((axsr & 0x80) && (txsr & TX_READY) == 0)
573 {
574 /*
575 * FIXME: is there a logic to whether to keep on trying or
576 * reset immediately ?
577 */
578 if(el_debug>1)
579 printk(KERN_DEBUG "%s: Unusual interrupt during Tx, txsr=%02x axsr=%02x"
580 " gp=%03x rp=%03x.\n", dev->name, txsr, axsr,
581 inw(ioaddr + EL1_DATAPTR), inw(ioaddr + EL1_RXPTR));
582 lp->txing = 0;
583 netif_wake_queue(dev);
584 }
585 else if (txsr & TX_16COLLISIONS)
586 {
587 /*
588 * Timed out
589 */
590 if (el_debug)
591 printk (KERN_DEBUG "%s: Transmit failed 16 times, Ethernet jammed?\n",dev->name);
592 outb(AX_SYS, AX_CMD);
593 lp->txing = 0;
594 lp->stats.tx_aborted_errors++;
595 netif_wake_queue(dev);
596 }
597 else if (txsr & TX_COLLISION)
598 {
599 /*
600 * Retrigger xmit.
601 */
602
603 if (el_debug > 6)
604 printk(KERN_DEBUG " retransmitting after a collision.\n");
605 /*
606 * Poor little chip can't reset its own start pointer
607 */
608
609 outb(AX_SYS, AX_CMD);
610 outw(lp->tx_pkt_start, GP_LOW);
611 outb(AX_XMIT, AX_CMD);
612 lp->stats.collisions++;
613 spin_unlock(&lp->lock);
614 goto out;
615 }
616 else
617 {
618 /*
619 * It worked.. we will now fall through and receive
620 */
621 lp->stats.tx_packets++;
622 if (el_debug > 6)
623 printk(KERN_DEBUG " Tx succeeded %s\n",
624 (txsr & TX_RDY) ? "." : "but tx is busy!");
625 /*
626 * This is safe the interrupt is atomic WRT itself.
627 */
628
629 lp->txing = 0;
630 netif_wake_queue(dev); /* In case more to transmit */
631 }
632 }
633 else
634 {
635 /*
636 * In receive mode.
637 */
638
639 int rxsr = inb(RX_STATUS);
640 if (el_debug > 5)
641 printk(KERN_DEBUG " rxsr=%02x txsr=%02x rp=%04x", rxsr, inb(TX_STATUS),inw(RX_LOW));
642 /*
643 * Just reading rx_status fixes most errors.
644 */
645 if (rxsr & RX_MISSED)
646 lp->stats.rx_missed_errors++;
647 else if (rxsr & RX_RUNT)
648 { /* Handled to avoid board lock-up. */
649 lp->stats.rx_length_errors++;
650 if (el_debug > 5)
651 printk(KERN_DEBUG " runt.\n");
652 }
653 else if (rxsr & RX_GOOD)
654 {
655 /*
656 * Receive worked.
657 */
658 el_receive(dev);
659 }
660 else
661 {
662 /*
663 * Nothing? Something is broken!
664 */
665 if (el_debug > 2)
666 printk(KERN_DEBUG "%s: No packet seen, rxsr=%02x **resetting 3c501***\n",
667 dev->name, rxsr);
668 el_reset(dev);
669 }
670 if (el_debug > 3)
671 printk(KERN_DEBUG ".\n");
672 }
673
674 /*
675 * Move into receive mode
676 */
677
678 outb(AX_RX, AX_CMD);
679 outw(0x00, RX_BUF_CLR);
680 inb(RX_STATUS); /* Be certain that interrupts are cleared. */
681 inb(TX_STATUS);
682 spin_unlock(&lp->lock);
683 out:
684 return IRQ_HANDLED;
685 }
686
687
688 /**
689 * el_receive:
690 * @dev: Device to pull the packets from
691 *
692 * We have a good packet. Well, not really "good", just mostly not broken.
693 * We must check everything to see if it is good. In particular we occasionally
694 * get wild packet sizes from the card. If the packet seems sane we PIO it
695 * off the card and queue it for the protocol layers.
696 */
697
698 static void el_receive(struct net_device *dev)
699 {
700 struct net_local *lp = netdev_priv(dev);
701 int ioaddr = dev->base_addr;
702 int pkt_len;
703 struct sk_buff *skb;
704
705 pkt_len = inw(RX_LOW);
706
707 if (el_debug > 4)
708 printk(KERN_DEBUG " el_receive %d.\n", pkt_len);
709
710 if ((pkt_len < 60) || (pkt_len > 1536))
711 {
712 if (el_debug)
713 printk(KERN_DEBUG "%s: bogus packet, length=%d\n", dev->name, pkt_len);
714 lp->stats.rx_over_errors++;
715 return;
716 }
717
718 /*
719 * Command mode so we can empty the buffer
720 */
721
722 outb(AX_SYS, AX_CMD);
723 skb = dev_alloc_skb(pkt_len+2);
724
725 /*
726 * Start of frame
727 */
728
729 outw(0x00, GP_LOW);
730 if (skb == NULL)
731 {
732 printk(KERN_INFO "%s: Memory squeeze, dropping packet.\n", dev->name);
733 lp->stats.rx_dropped++;
734 return;
735 }
736 else
737 {
738 skb_reserve(skb,2); /* Force 16 byte alignment */
739 skb->dev = dev;
740 /*
741 * The read increments through the bytes. The interrupt
742 * handler will fix the pointer when it returns to
743 * receive mode.
744 */
745 insb(DATAPORT, skb_put(skb,pkt_len), pkt_len);
746 skb->protocol=eth_type_trans(skb,dev);
747 netif_rx(skb);
748 dev->last_rx = jiffies;
749 lp->stats.rx_packets++;
750 lp->stats.rx_bytes+=pkt_len;
751 }
752 return;
753 }
754
755 /**
756 * el_reset: Reset a 3c501 card
757 * @dev: The 3c501 card about to get zapped
758 *
759 * Even resetting a 3c501 isnt simple. When you activate reset it loses all
760 * its configuration. You must hold the lock when doing this. The function
761 * cannot take the lock itself as it is callable from the irq handler.
762 */
763
764 static void el_reset(struct net_device *dev)
765 {
766 struct net_local *lp = netdev_priv(dev);
767 int ioaddr = dev->base_addr;
768
769 if (el_debug> 2)
770 printk(KERN_INFO "3c501 reset...");
771 outb(AX_RESET, AX_CMD); /* Reset the chip */
772 outb(AX_LOOP, AX_CMD); /* Aux control, irq and loopback enabled */
773 {
774 int i;
775 for (i = 0; i < 6; i++) /* Set the station address. */
776 outb(dev->dev_addr[i], ioaddr + i);
777 }
778
779 outw(0, RX_BUF_CLR); /* Set rx packet area to 0. */
780 outb(TX_NORM, TX_CMD); /* tx irq on done, collision */
781 outb(RX_NORM, RX_CMD); /* Set Rx commands. */
782 inb(RX_STATUS); /* Clear status. */
783 inb(TX_STATUS);
784 lp->txing = 0;
785 }
786
787 /**
788 * el1_close:
789 * @dev: 3c501 card to shut down
790 *
791 * Close a 3c501 card. The IFF_UP flag has been cleared by the user via
792 * the SIOCSIFFLAGS ioctl. We stop any further transmissions being queued,
793 * and then disable the interrupts. Finally we reset the chip. The effects
794 * of the rest will be cleaned up by #el1_open. Always returns 0 indicating
795 * a success.
796 */
797
798 static int el1_close(struct net_device *dev)
799 {
800 int ioaddr = dev->base_addr;
801
802 if (el_debug > 2)
803 printk(KERN_INFO "%s: Shutting down Ethernet card at %#x.\n", dev->name, ioaddr);
804
805 netif_stop_queue(dev);
806
807 /*
808 * Free and disable the IRQ.
809 */
810
811 free_irq(dev->irq, dev);
812 outb(AX_RESET, AX_CMD); /* Reset the chip */
813
814 return 0;
815 }
816
817 /**
818 * el1_get_stats:
819 * @dev: The card to get the statistics for
820 *
821 * In smarter devices this function is needed to pull statistics off the
822 * board itself. The 3c501 has no hardware statistics. We maintain them all
823 * so they are by definition always up to date.
824 *
825 * Returns the statistics for the card from the card private data
826 */
827
828 static struct net_device_stats *el1_get_stats(struct net_device *dev)
829 {
830 struct net_local *lp = netdev_priv(dev);
831 return &lp->stats;
832 }
833
834 /**
835 * set_multicast_list:
836 * @dev: The device to adjust
837 *
838 * Set or clear the multicast filter for this adaptor to use the best-effort
839 * filtering supported. The 3c501 supports only three modes of filtering.
840 * It always receives broadcasts and packets for itself. You can choose to
841 * optionally receive all packets, or all multicast packets on top of this.
842 */
843
844 static void set_multicast_list(struct net_device *dev)
845 {
846 int ioaddr = dev->base_addr;
847
848 if(dev->flags&IFF_PROMISC)
849 {
850 outb(RX_PROM, RX_CMD);
851 inb(RX_STATUS);
852 }
853 else if (dev->mc_list || dev->flags&IFF_ALLMULTI)
854 {
855 outb(RX_MULT, RX_CMD); /* Multicast or all multicast is the same */
856 inb(RX_STATUS); /* Clear status. */
857 }
858 else
859 {
860 outb(RX_NORM, RX_CMD);
861 inb(RX_STATUS);
862 }
863 }
864
865
866 static void netdev_get_drvinfo(struct net_device *dev,
867 struct ethtool_drvinfo *info)
868 {
869 strcpy(info->driver, DRV_NAME);
870 strcpy(info->version, DRV_VERSION);
871 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
872 }
873
874 static u32 netdev_get_msglevel(struct net_device *dev)
875 {
876 return debug;
877 }
878
879 static void netdev_set_msglevel(struct net_device *dev, u32 level)
880 {
881 debug = level;
882 }
883
884 static struct ethtool_ops netdev_ethtool_ops = {
885 .get_drvinfo = netdev_get_drvinfo,
886 .get_msglevel = netdev_get_msglevel,
887 .set_msglevel = netdev_set_msglevel,
888 };
889
890 #ifdef MODULE
891
892 static struct net_device *dev_3c501;
893
894 module_param(io, int, 0);
895 module_param(irq, int, 0);
896 MODULE_PARM_DESC(io, "EtherLink I/O base address");
897 MODULE_PARM_DESC(irq, "EtherLink IRQ number");
898
899 /**
900 * init_module:
901 *
902 * When the driver is loaded as a module this function is called. We fake up
903 * a device structure with the base I/O and interrupt set as if it were being
904 * called from Space.c. This minimises the extra code that would otherwise
905 * be required.
906 *
907 * Returns 0 for success or -EIO if a card is not found. Returning an error
908 * here also causes the module to be unloaded
909 */
910
911 int __init init_module(void)
912 {
913 dev_3c501 = el1_probe(-1);
914 if (IS_ERR(dev_3c501))
915 return PTR_ERR(dev_3c501);
916 return 0;
917 }
918
919 /**
920 * cleanup_module:
921 *
922 * The module is being unloaded. We unhook our network device from the system
923 * and then free up the resources we took when the card was found.
924 */
925
926 void cleanup_module(void)
927 {
928 struct net_device *dev = dev_3c501;
929 unregister_netdev(dev);
930 release_region(dev->base_addr, EL1_IO_EXTENT);
931 free_netdev(dev);
932 }
933
934 #endif /* MODULE */
935
936 MODULE_AUTHOR("Donald Becker, Alan Cox");
937 MODULE_DESCRIPTION("Support for the ancient 3Com 3c501 ethernet card");
938 MODULE_LICENSE("GPL");
939
940
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