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@lxorguk.ukuu.org.uk>
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@lxorguk.ukuu.org.uk>
33
34 Cleaned up for 2.3.x because we broke SMP now.
35 20000208 Alan Cox <alan@lxorguk.ukuu.org.uk>
36
37 Check up pass for 2.5. Nothing significant changed
38 20021009 Alan Cox <alan@lxorguk.ukuu.org.uk>
39
40 Fixed zero fill corner case
41 20030104 Alan Cox <alan@lxorguk.ukuu.org.uk>
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@lxorguk.ukuu.org.uk).\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/string.h>
121 #include <linux/errno.h>
122 #include <linux/spinlock.h>
123 #include <linux/ethtool.h>
124 #include <linux/delay.h>
125 #include <linux/bitops.h>
126
127 #include <asm/uaccess.h>
128 #include <asm/io.h>
129
130 #include <linux/netdevice.h>
131 #include <linux/etherdevice.h>
132 #include <linux/skbuff.h>
133 #include <linux/init.h>
134
135 #include "3c501.h"
136
137 /*
138 * The boilerplate probe code.
139 */
140
141 static int io = 0x280;
142 static int irq = 5;
143 static int mem_start;
144
145 /**
146 * el1_probe: - probe for a 3c501
147 * @dev: The device structure passed in to probe.
148 *
149 * This can be called from two places. The network layer will probe using
150 * a device structure passed in with the probe information completed. For a
151 * modular driver we use #init_module to fill in our own structure and probe
152 * for it.
153 *
154 * Returns 0 on success. ENXIO if asked not to probe and ENODEV if asked to
155 * probe and failing to find anything.
156 */
157
el1_probe(int unit)158 struct net_device * __init el1_probe(int unit)
159 {
160 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
161 static const unsigned ports[] = { 0x280, 0x300, 0};
162 const unsigned *port;
163 int err = 0;
164
165 if (!dev)
166 return ERR_PTR(-ENOMEM);
167
168 if (unit >= 0) {
169 sprintf(dev->name, "eth%d", unit);
170 netdev_boot_setup_check(dev);
171 io = dev->base_addr;
172 irq = dev->irq;
173 mem_start = dev->mem_start & 7;
174 }
175
176 if (io > 0x1ff) { /* Check a single specified location. */
177 err = el1_probe1(dev, io);
178 } else if (io != 0) {
179 err = -ENXIO; /* Don't probe at all. */
180 } else {
181 for (port = ports; *port && el1_probe1(dev, *port); port++)
182 ;
183 if (!*port)
184 err = -ENODEV;
185 }
186 if (err)
187 goto out;
188 err = register_netdev(dev);
189 if (err)
190 goto out1;
191 return dev;
192 out1:
193 release_region(dev->base_addr, EL1_IO_EXTENT);
194 out:
195 free_netdev(dev);
196 return ERR_PTR(err);
197 }
198
199 static const struct net_device_ops el_netdev_ops = {
200 .ndo_open = el_open,
201 .ndo_stop = el1_close,
202 .ndo_start_xmit = el_start_xmit,
203 .ndo_tx_timeout = el_timeout,
204 .ndo_set_rx_mode = set_multicast_list,
205 .ndo_change_mtu = eth_change_mtu,
206 .ndo_set_mac_address = eth_mac_addr,
207 .ndo_validate_addr = eth_validate_addr,
208 };
209
210 /**
211 * el1_probe1:
212 * @dev: The device structure to use
213 * @ioaddr: An I/O address to probe at.
214 *
215 * The actual probe. This is iterated over by #el1_probe in order to
216 * check all the applicable device locations.
217 *
218 * Returns 0 for a success, in which case the device is activated,
219 * EAGAIN if the IRQ is in use by another driver, and ENODEV if the
220 * board cannot be found.
221 */
222
el1_probe1(struct net_device * dev,int ioaddr)223 static int __init el1_probe1(struct net_device *dev, int ioaddr)
224 {
225 struct net_local *lp;
226 const char *mname; /* Vendor name */
227 unsigned char station_addr[6];
228 int autoirq = 0;
229 int i;
230
231 /*
232 * Reserve I/O resource for exclusive use by this driver
233 */
234
235 if (!request_region(ioaddr, EL1_IO_EXTENT, DRV_NAME))
236 return -ENODEV;
237
238 /*
239 * Read the station address PROM data from the special port.
240 */
241
242 for (i = 0; i < 6; i++) {
243 outw(i, ioaddr + EL1_DATAPTR);
244 station_addr[i] = inb(ioaddr + EL1_SAPROM);
245 }
246 /*
247 * Check the first three octets of the S.A. for 3Com's prefix, or
248 * for the Sager NP943 prefix.
249 */
250
251 if (station_addr[0] == 0x02 && station_addr[1] == 0x60 &&
252 station_addr[2] == 0x8c)
253 mname = "3c501";
254 else if (station_addr[0] == 0x00 && station_addr[1] == 0x80 &&
255 station_addr[2] == 0xC8)
256 mname = "NP943";
257 else {
258 release_region(ioaddr, EL1_IO_EXTENT);
259 return -ENODEV;
260 }
261
262 /*
263 * We auto-IRQ by shutting off the interrupt line and letting it
264 * float high.
265 */
266
267 dev->irq = irq;
268
269 if (dev->irq < 2) {
270 unsigned long irq_mask;
271
272 irq_mask = probe_irq_on();
273 inb(RX_STATUS); /* Clear pending interrupts. */
274 inb(TX_STATUS);
275 outb(AX_LOOP + 1, AX_CMD);
276
277 outb(0x00, AX_CMD);
278
279 mdelay(20);
280 autoirq = probe_irq_off(irq_mask);
281
282 if (autoirq == 0) {
283 pr_warning("%s probe at %#x failed to detect IRQ line.\n",
284 mname, ioaddr);
285 release_region(ioaddr, EL1_IO_EXTENT);
286 return -EAGAIN;
287 }
288 }
289
290 outb(AX_RESET+AX_LOOP, AX_CMD); /* Loopback mode. */
291 dev->base_addr = ioaddr;
292 memcpy(dev->dev_addr, station_addr, ETH_ALEN);
293
294 if (mem_start & 0xf)
295 el_debug = mem_start & 0x7;
296 if (autoirq)
297 dev->irq = autoirq;
298
299 pr_info("%s: %s EtherLink at %#lx, using %sIRQ %d.\n",
300 dev->name, mname, dev->base_addr,
301 autoirq ? "auto":"assigned ", dev->irq);
302
303 #ifdef CONFIG_IP_MULTICAST
304 pr_warning("WARNING: Use of the 3c501 in a multicast kernel is NOT recommended.\n");
305 #endif
306
307 if (el_debug)
308 pr_debug("%s", version);
309
310 lp = netdev_priv(dev);
311 memset(lp, 0, sizeof(struct net_local));
312 spin_lock_init(&lp->lock);
313
314 /*
315 * The EL1-specific entries in the device structure.
316 */
317
318 dev->netdev_ops = &el_netdev_ops;
319 dev->watchdog_timeo = HZ;
320 dev->ethtool_ops = &netdev_ethtool_ops;
321 return 0;
322 }
323
324 /**
325 * el1_open:
326 * @dev: device that is being opened
327 *
328 * When an ifconfig is issued which changes the device flags to include
329 * IFF_UP this function is called. It is only called when the change
330 * occurs, not when the interface remains up. #el1_close will be called
331 * when it goes down.
332 *
333 * Returns 0 for a successful open, or -EAGAIN if someone has run off
334 * with our interrupt line.
335 */
336
el_open(struct net_device * dev)337 static int el_open(struct net_device *dev)
338 {
339 int retval;
340 int ioaddr = dev->base_addr;
341 struct net_local *lp = netdev_priv(dev);
342 unsigned long flags;
343
344 if (el_debug > 2)
345 pr_debug("%s: Doing el_open()...\n", dev->name);
346
347 retval = request_irq(dev->irq, el_interrupt, 0, dev->name, dev);
348 if (retval)
349 return retval;
350
351 spin_lock_irqsave(&lp->lock, flags);
352 el_reset(dev);
353 spin_unlock_irqrestore(&lp->lock, flags);
354
355 lp->txing = 0; /* Board in RX mode */
356 outb(AX_RX, AX_CMD); /* Aux control, irq and receive enabled */
357 netif_start_queue(dev);
358 return 0;
359 }
360
361 /**
362 * el_timeout:
363 * @dev: The 3c501 card that has timed out
364 *
365 * Attempt to restart the board. This is basically a mixture of extreme
366 * violence and prayer
367 *
368 */
369
el_timeout(struct net_device * dev)370 static void el_timeout(struct net_device *dev)
371 {
372 struct net_local *lp = netdev_priv(dev);
373 int ioaddr = dev->base_addr;
374
375 if (el_debug)
376 pr_debug("%s: transmit timed out, txsr %#2x axsr=%02x rxsr=%02x.\n",
377 dev->name, inb(TX_STATUS),
378 inb(AX_STATUS), inb(RX_STATUS));
379 dev->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 isn't 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
el_start_xmit(struct sk_buff * skb,struct net_device * dev)411 static netdev_tx_t 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 int len = skb->len;
433 int pad = 0;
434 int gp_start;
435 unsigned char *buf = skb->data;
436
437 if (len < ETH_ZLEN)
438 pad = ETH_ZLEN - len;
439
440 gp_start = 0x800 - (len + pad);
441
442 lp->tx_pkt_start = gp_start;
443 lp->collisions = 0;
444
445 dev->stats.tx_bytes += skb->len;
446
447 /*
448 * Command mode with status cleared should [in theory]
449 * mean no more interrupts can be pending on the card.
450 */
451
452 outb_p(AX_SYS, AX_CMD);
453 inb_p(RX_STATUS);
454 inb_p(TX_STATUS);
455
456 lp->loading = 1;
457 lp->txing = 1;
458
459 /*
460 * Turn interrupts back on while we spend a pleasant
461 * afternoon loading bytes into the board
462 */
463
464 spin_unlock_irqrestore(&lp->lock, flags);
465
466 /* Set rx packet area to 0. */
467 outw(0x00, RX_BUF_CLR);
468 /* aim - packet will be loaded into buffer start */
469 outw(gp_start, GP_LOW);
470 /* load buffer (usual thing each byte increments the pointer) */
471 outsb(DATAPORT, buf, len);
472 if (pad) {
473 while (pad--) /* Zero fill buffer tail */
474 outb(0, DATAPORT);
475 }
476 /* the board reuses the same register */
477 outw(gp_start, GP_LOW);
478
479 if (lp->loading != 2) {
480 /* fire ... Trigger xmit. */
481 outb(AX_XMIT, AX_CMD);
482 lp->loading = 0;
483 if (el_debug > 2)
484 pr_debug(" queued xmit.\n");
485 dev_kfree_skb(skb);
486 return NETDEV_TX_OK;
487 }
488 /* A receive upset our load, despite our best efforts */
489 if (el_debug > 2)
490 pr_debug("%s: burped during tx load.\n", dev->name);
491 spin_lock_irqsave(&lp->lock, flags);
492 } while (1);
493 }
494
495 /**
496 * el_interrupt:
497 * @irq: Interrupt number
498 * @dev_id: The 3c501 that burped
499 *
500 * Handle the ether interface interrupts. The 3c501 needs a lot more
501 * hand holding than most cards. In particular we get a transmit interrupt
502 * with a collision error because the board firmware isn't capable of rewinding
503 * its own transmit buffer pointers. It can however count to 16 for us.
504 *
505 * On the receive side the card is also very dumb. It has no buffering to
506 * speak of. We simply pull the packet out of its PIO buffer (which is slow)
507 * and queue it for the kernel. Then we reset the card for the next packet.
508 *
509 * We sometimes get surprise interrupts late both because the SMP IRQ delivery
510 * is message passing and because the card sometimes seems to deliver late. I
511 * think if it is part way through a receive and the mode is changed it carries
512 * on receiving and sends us an interrupt. We have to band aid all these cases
513 * to get a sensible 150kBytes/second performance. Even then you want a small
514 * TCP window.
515 */
516
el_interrupt(int irq,void * dev_id)517 static irqreturn_t el_interrupt(int irq, void *dev_id)
518 {
519 struct net_device *dev = dev_id;
520 struct net_local *lp;
521 int ioaddr;
522 int axsr; /* Aux. status reg. */
523
524 ioaddr = dev->base_addr;
525 lp = netdev_priv(dev);
526
527 spin_lock(&lp->lock);
528
529 /*
530 * What happened ?
531 */
532
533 axsr = inb(AX_STATUS);
534
535 /*
536 * Log it
537 */
538
539 if (el_debug > 3)
540 pr_debug("%s: el_interrupt() aux=%#02x\n", dev->name, axsr);
541
542 if (lp->loading == 1 && !lp->txing)
543 pr_warning("%s: Inconsistent state loading while not in tx\n",
544 dev->name);
545
546 if (lp->txing) {
547 /*
548 * Board in transmit mode. May be loading. If we are
549 * loading we shouldn't have got this.
550 */
551 int txsr = inb(TX_STATUS);
552
553 if (lp->loading == 1) {
554 if (el_debug > 2)
555 pr_debug("%s: Interrupt while loading [txsr=%02x gp=%04x rp=%04x]\n",
556 dev->name, txsr, inw(GP_LOW), inw(RX_LOW));
557
558 /* Force a reload */
559 lp->loading = 2;
560 spin_unlock(&lp->lock);
561 goto out;
562 }
563 if (el_debug > 6)
564 pr_debug("%s: txsr=%02x gp=%04x rp=%04x\n", dev->name,
565 txsr, inw(GP_LOW), inw(RX_LOW));
566
567 if ((axsr & 0x80) && (txsr & TX_READY) == 0) {
568 /*
569 * FIXME: is there a logic to whether to keep
570 * on trying or reset immediately ?
571 */
572 if (el_debug > 1)
573 pr_debug("%s: Unusual interrupt during Tx, txsr=%02x axsr=%02x gp=%03x rp=%03x.\n",
574 dev->name, txsr, axsr,
575 inw(ioaddr + EL1_DATAPTR),
576 inw(ioaddr + EL1_RXPTR));
577 lp->txing = 0;
578 netif_wake_queue(dev);
579 } else if (txsr & TX_16COLLISIONS) {
580 /*
581 * Timed out
582 */
583 if (el_debug)
584 pr_debug("%s: Transmit failed 16 times, Ethernet jammed?\n", dev->name);
585 outb(AX_SYS, AX_CMD);
586 lp->txing = 0;
587 dev->stats.tx_aborted_errors++;
588 netif_wake_queue(dev);
589 } else if (txsr & TX_COLLISION) {
590 /*
591 * Retrigger xmit.
592 */
593
594 if (el_debug > 6)
595 pr_debug("%s: retransmitting after a collision.\n", dev->name);
596 /*
597 * Poor little chip can't reset its own start
598 * pointer
599 */
600
601 outb(AX_SYS, AX_CMD);
602 outw(lp->tx_pkt_start, GP_LOW);
603 outb(AX_XMIT, AX_CMD);
604 dev->stats.collisions++;
605 spin_unlock(&lp->lock);
606 goto out;
607 } else {
608 /*
609 * It worked.. we will now fall through and receive
610 */
611 dev->stats.tx_packets++;
612 if (el_debug > 6)
613 pr_debug("%s: Tx succeeded %s\n", dev->name,
614 (txsr & TX_RDY) ? "." : "but tx is busy!");
615 /*
616 * This is safe the interrupt is atomic WRT itself.
617 */
618 lp->txing = 0;
619 /* In case more to transmit */
620 netif_wake_queue(dev);
621 }
622 } else {
623 /*
624 * In receive mode.
625 */
626
627 int rxsr = inb(RX_STATUS);
628 if (el_debug > 5)
629 pr_debug("%s: rxsr=%02x txsr=%02x rp=%04x\n",
630 dev->name, rxsr, inb(TX_STATUS), inw(RX_LOW));
631 /*
632 * Just reading rx_status fixes most errors.
633 */
634 if (rxsr & RX_MISSED)
635 dev->stats.rx_missed_errors++;
636 else if (rxsr & RX_RUNT) {
637 /* Handled to avoid board lock-up. */
638 dev->stats.rx_length_errors++;
639 if (el_debug > 5)
640 pr_debug("%s: runt.\n", dev->name);
641 } else if (rxsr & RX_GOOD) {
642 /*
643 * Receive worked.
644 */
645 el_receive(dev);
646 } else {
647 /*
648 * Nothing? Something is broken!
649 */
650 if (el_debug > 2)
651 pr_debug("%s: No packet seen, rxsr=%02x **resetting 3c501***\n",
652 dev->name, rxsr);
653 el_reset(dev);
654 }
655 }
656
657 /*
658 * Move into receive mode
659 */
660
661 outb(AX_RX, AX_CMD);
662 outw(0x00, RX_BUF_CLR);
663 inb(RX_STATUS); /* Be certain that interrupts are cleared. */
664 inb(TX_STATUS);
665 spin_unlock(&lp->lock);
666 out:
667 return IRQ_HANDLED;
668 }
669
670
671 /**
672 * el_receive:
673 * @dev: Device to pull the packets from
674 *
675 * We have a good packet. Well, not really "good", just mostly not broken.
676 * We must check everything to see if it is good. In particular we occasionally
677 * get wild packet sizes from the card. If the packet seems sane we PIO it
678 * off the card and queue it for the protocol layers.
679 */
680
el_receive(struct net_device * dev)681 static void el_receive(struct net_device *dev)
682 {
683 int ioaddr = dev->base_addr;
684 int pkt_len;
685 struct sk_buff *skb;
686
687 pkt_len = inw(RX_LOW);
688
689 if (el_debug > 4)
690 pr_debug(" el_receive %d.\n", pkt_len);
691
692 if (pkt_len < 60 || pkt_len > 1536) {
693 if (el_debug)
694 pr_debug("%s: bogus packet, length=%d\n",
695 dev->name, pkt_len);
696 dev->stats.rx_over_errors++;
697 return;
698 }
699
700 /*
701 * Command mode so we can empty the buffer
702 */
703
704 outb(AX_SYS, AX_CMD);
705 skb = dev_alloc_skb(pkt_len+2);
706
707 /*
708 * Start of frame
709 */
710
711 outw(0x00, GP_LOW);
712 if (skb == NULL) {
713 pr_info("%s: Memory squeeze, dropping packet.\n", dev->name);
714 dev->stats.rx_dropped++;
715 return;
716 } else {
717 skb_reserve(skb, 2); /* Force 16 byte alignment */
718 /*
719 * The read increments through the bytes. The interrupt
720 * handler will fix the pointer when it returns to
721 * receive mode.
722 */
723 insb(DATAPORT, skb_put(skb, pkt_len), pkt_len);
724 skb->protocol = eth_type_trans(skb, dev);
725 netif_rx(skb);
726 dev->stats.rx_packets++;
727 dev->stats.rx_bytes += pkt_len;
728 }
729 }
730
731 /**
732 * el_reset: Reset a 3c501 card
733 * @dev: The 3c501 card about to get zapped
734 *
735 * Even resetting a 3c501 isn't simple. When you activate reset it loses all
736 * its configuration. You must hold the lock when doing this. The function
737 * cannot take the lock itself as it is callable from the irq handler.
738 */
739
el_reset(struct net_device * dev)740 static void el_reset(struct net_device *dev)
741 {
742 struct net_local *lp = netdev_priv(dev);
743 int ioaddr = dev->base_addr;
744
745 if (el_debug > 2)
746 pr_info("3c501 reset...\n");
747 outb(AX_RESET, AX_CMD); /* Reset the chip */
748 /* Aux control, irq and loopback enabled */
749 outb(AX_LOOP, AX_CMD);
750 {
751 int i;
752 for (i = 0; i < 6; i++) /* Set the station address. */
753 outb(dev->dev_addr[i], ioaddr + i);
754 }
755
756 outw(0, RX_BUF_CLR); /* Set rx packet area to 0. */
757 outb(TX_NORM, TX_CMD); /* tx irq on done, collision */
758 outb(RX_NORM, RX_CMD); /* Set Rx commands. */
759 inb(RX_STATUS); /* Clear status. */
760 inb(TX_STATUS);
761 lp->txing = 0;
762 }
763
764 /**
765 * el1_close:
766 * @dev: 3c501 card to shut down
767 *
768 * Close a 3c501 card. The IFF_UP flag has been cleared by the user via
769 * the SIOCSIFFLAGS ioctl. We stop any further transmissions being queued,
770 * and then disable the interrupts. Finally we reset the chip. The effects
771 * of the rest will be cleaned up by #el1_open. Always returns 0 indicating
772 * a success.
773 */
774
el1_close(struct net_device * dev)775 static int el1_close(struct net_device *dev)
776 {
777 int ioaddr = dev->base_addr;
778
779 if (el_debug > 2)
780 pr_info("%s: Shutting down Ethernet card at %#x.\n",
781 dev->name, ioaddr);
782
783 netif_stop_queue(dev);
784
785 /*
786 * Free and disable the IRQ.
787 */
788
789 free_irq(dev->irq, dev);
790 outb(AX_RESET, AX_CMD); /* Reset the chip */
791
792 return 0;
793 }
794
795 /**
796 * set_multicast_list:
797 * @dev: The device to adjust
798 *
799 * Set or clear the multicast filter for this adaptor to use the best-effort
800 * filtering supported. The 3c501 supports only three modes of filtering.
801 * It always receives broadcasts and packets for itself. You can choose to
802 * optionally receive all packets, or all multicast packets on top of this.
803 */
804
set_multicast_list(struct net_device * dev)805 static void set_multicast_list(struct net_device *dev)
806 {
807 int ioaddr = dev->base_addr;
808
809 if (dev->flags & IFF_PROMISC) {
810 outb(RX_PROM, RX_CMD);
811 inb(RX_STATUS);
812 } else if (!netdev_mc_empty(dev) || dev->flags & IFF_ALLMULTI) {
813 /* Multicast or all multicast is the same */
814 outb(RX_MULT, RX_CMD);
815 inb(RX_STATUS); /* Clear status. */
816 } else {
817 outb(RX_NORM, RX_CMD);
818 inb(RX_STATUS);
819 }
820 }
821
822
netdev_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)823 static void netdev_get_drvinfo(struct net_device *dev,
824 struct ethtool_drvinfo *info)
825 {
826 strcpy(info->driver, DRV_NAME);
827 strcpy(info->version, DRV_VERSION);
828 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
829 }
830
netdev_get_msglevel(struct net_device * dev)831 static u32 netdev_get_msglevel(struct net_device *dev)
832 {
833 return debug;
834 }
835
netdev_set_msglevel(struct net_device * dev,u32 level)836 static void netdev_set_msglevel(struct net_device *dev, u32 level)
837 {
838 debug = level;
839 }
840
841 static const struct ethtool_ops netdev_ethtool_ops = {
842 .get_drvinfo = netdev_get_drvinfo,
843 .get_msglevel = netdev_get_msglevel,
844 .set_msglevel = netdev_set_msglevel,
845 };
846
847 #ifdef MODULE
848
849 static struct net_device *dev_3c501;
850
851 module_param(io, int, 0);
852 module_param(irq, int, 0);
853 MODULE_PARM_DESC(io, "EtherLink I/O base address");
854 MODULE_PARM_DESC(irq, "EtherLink IRQ number");
855
856 /**
857 * init_module:
858 *
859 * When the driver is loaded as a module this function is called. We fake up
860 * a device structure with the base I/O and interrupt set as if it were being
861 * called from Space.c. This minimises the extra code that would otherwise
862 * be required.
863 *
864 * Returns 0 for success or -EIO if a card is not found. Returning an error
865 * here also causes the module to be unloaded
866 */
867
init_module(void)868 int __init init_module(void)
869 {
870 dev_3c501 = el1_probe(-1);
871 if (IS_ERR(dev_3c501))
872 return PTR_ERR(dev_3c501);
873 return 0;
874 }
875
876 /**
877 * cleanup_module:
878 *
879 * The module is being unloaded. We unhook our network device from the system
880 * and then free up the resources we took when the card was found.
881 */
882
cleanup_module(void)883 void __exit cleanup_module(void)
884 {
885 struct net_device *dev = dev_3c501;
886 unregister_netdev(dev);
887 release_region(dev->base_addr, EL1_IO_EXTENT);
888 free_netdev(dev);
889 }
890
891 #endif /* MODULE */
892
893 MODULE_AUTHOR("Donald Becker, Alan Cox");
894 MODULE_DESCRIPTION("Support for the ancient 3Com 3c501 ethernet card");
895 MODULE_LICENSE("GPL");
896
897