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/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
el1_probe(int unit)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 if (io > 0x1ff) { /* Check a single specified location. */
178 err = el1_probe1(dev, io);
179 } else if (io != 0) {
180 err = -ENXIO; /* Don't probe at all. */
181 } else {
182 for (port = ports; *port && el1_probe1(dev, *port); port++)
183 ;
184 if (!*port)
185 err = -ENODEV;
186 }
187 if (err)
188 goto out;
189 err = register_netdev(dev);
190 if (err)
191 goto out1;
192 return dev;
193 out1:
194 release_region(dev->base_addr, EL1_IO_EXTENT);
195 out:
196 free_netdev(dev);
197 return ERR_PTR(err);
198 }
199
200 /**
201 * el1_probe1:
202 * @dev: The device structure to use
203 * @ioaddr: An I/O address to probe at.
204 *
205 * The actual probe. This is iterated over by #el1_probe in order to
206 * check all the applicable device locations.
207 *
208 * Returns 0 for a success, in which case the device is activated,
209 * EAGAIN if the IRQ is in use by another driver, and ENODEV if the
210 * board cannot be found.
211 */
212
el1_probe1(struct net_device * dev,int ioaddr)213 static int __init el1_probe1(struct net_device *dev, int ioaddr)
214 {
215 struct net_local *lp;
216 const char *mname; /* Vendor name */
217 unsigned char station_addr[6];
218 int autoirq = 0;
219 int i;
220
221 /*
222 * Reserve I/O resource for exclusive use by this driver
223 */
224
225 if (!request_region(ioaddr, EL1_IO_EXTENT, DRV_NAME))
226 return -ENODEV;
227
228 /*
229 * Read the station address PROM data from the special port.
230 */
231
232 for (i = 0; i < 6; i++) {
233 outw(i, ioaddr + EL1_DATAPTR);
234 station_addr[i] = inb(ioaddr + EL1_SAPROM);
235 }
236 /*
237 * Check the first three octets of the S.A. for 3Com's prefix, or
238 * for the Sager NP943 prefix.
239 */
240
241 if (station_addr[0] == 0x02 && station_addr[1] == 0x60
242 && station_addr[2] == 0x8c)
243 mname = "3c501";
244 else if (station_addr[0] == 0x00 && station_addr[1] == 0x80
245 && station_addr[2] == 0xC8)
246 mname = "NP943";
247 else {
248 release_region(ioaddr, EL1_IO_EXTENT);
249 return -ENODEV;
250 }
251
252 /*
253 * We auto-IRQ by shutting off the interrupt line and letting it
254 * float high.
255 */
256
257 dev->irq = irq;
258
259 if (dev->irq < 2) {
260 unsigned long irq_mask;
261
262 irq_mask = probe_irq_on();
263 inb(RX_STATUS); /* Clear pending interrupts. */
264 inb(TX_STATUS);
265 outb(AX_LOOP + 1, AX_CMD);
266
267 outb(0x00, AX_CMD);
268
269 mdelay(20);
270 autoirq = probe_irq_off(irq_mask);
271
272 if (autoirq == 0) {
273 printk(KERN_WARNING "%s probe at %#x failed to detect IRQ line.\n",
274 mname, ioaddr);
275 release_region(ioaddr, EL1_IO_EXTENT);
276 return -EAGAIN;
277 }
278 }
279
280 outb(AX_RESET+AX_LOOP, AX_CMD); /* Loopback mode. */
281 dev->base_addr = ioaddr;
282 memcpy(dev->dev_addr, station_addr, ETH_ALEN);
283
284 if (mem_start & 0xf)
285 el_debug = mem_start & 0x7;
286 if (autoirq)
287 dev->irq = autoirq;
288
289 printk(KERN_INFO "%s: %s EtherLink at %#lx, using %sIRQ %d.\n",
290 dev->name, mname, dev->base_addr,
291 autoirq ? "auto":"assigned ", dev->irq);
292
293 #ifdef CONFIG_IP_MULTICAST
294 printk(KERN_WARNING "WARNING: Use of the 3c501 in a multicast kernel is NOT recommended.\n");
295 #endif
296
297 if (el_debug)
298 printk(KERN_DEBUG "%s", version);
299
300 lp = netdev_priv(dev);
301 memset(lp, 0, sizeof(struct net_local));
302 spin_lock_init(&lp->lock);
303
304 /*
305 * The EL1-specific entries in the device structure.
306 */
307
308 dev->open = &el_open;
309 dev->hard_start_xmit = &el_start_xmit;
310 dev->tx_timeout = &el_timeout;
311 dev->watchdog_timeo = HZ;
312 dev->stop = &el1_close;
313 dev->set_multicast_list = &set_multicast_list;
314 dev->ethtool_ops = &netdev_ethtool_ops;
315 return 0;
316 }
317
318 /**
319 * el1_open:
320 * @dev: device that is being opened
321 *
322 * When an ifconfig is issued which changes the device flags to include
323 * IFF_UP this function is called. It is only called when the change
324 * occurs, not when the interface remains up. #el1_close will be called
325 * when it goes down.
326 *
327 * Returns 0 for a successful open, or -EAGAIN if someone has run off
328 * with our interrupt line.
329 */
330
el_open(struct net_device * dev)331 static int el_open(struct net_device *dev)
332 {
333 int retval;
334 int ioaddr = dev->base_addr;
335 struct net_local *lp = netdev_priv(dev);
336 unsigned long flags;
337
338 if (el_debug > 2)
339 printk(KERN_DEBUG "%s: Doing el_open()...", dev->name);
340
341 retval = request_irq(dev->irq, &el_interrupt, 0, dev->name, dev);
342 if (retval)
343 return retval;
344
345 spin_lock_irqsave(&lp->lock, flags);
346 el_reset(dev);
347 spin_unlock_irqrestore(&lp->lock, flags);
348
349 lp->txing = 0; /* Board in RX mode */
350 outb(AX_RX, AX_CMD); /* Aux control, irq and receive enabled */
351 netif_start_queue(dev);
352 return 0;
353 }
354
355 /**
356 * el_timeout:
357 * @dev: The 3c501 card that has timed out
358 *
359 * Attempt to restart the board. This is basically a mixture of extreme
360 * violence and prayer
361 *
362 */
363
el_timeout(struct net_device * dev)364 static void el_timeout(struct net_device *dev)
365 {
366 struct net_local *lp = netdev_priv(dev);
367 int ioaddr = dev->base_addr;
368
369 if (el_debug)
370 printk(KERN_DEBUG "%s: transmit timed out, txsr %#2x axsr=%02x rxsr=%02x.\n",
371 dev->name, inb(TX_STATUS),
372 inb(AX_STATUS), inb(RX_STATUS));
373 dev->stats.tx_errors++;
374 outb(TX_NORM, TX_CMD);
375 outb(RX_NORM, RX_CMD);
376 outb(AX_OFF, AX_CMD); /* Just trigger a false interrupt. */
377 outb(AX_RX, AX_CMD); /* Aux control, irq and receive enabled */
378 lp->txing = 0; /* Ripped back in to RX */
379 netif_wake_queue(dev);
380 }
381
382
383 /**
384 * el_start_xmit:
385 * @skb: The packet that is queued to be sent
386 * @dev: The 3c501 card we want to throw it down
387 *
388 * Attempt to send a packet to a 3c501 card. There are some interesting
389 * catches here because the 3c501 is an extremely old and therefore
390 * stupid piece of technology.
391 *
392 * If we are handling an interrupt on the other CPU we cannot load a packet
393 * as we may still be attempting to retrieve the last RX packet buffer.
394 *
395 * When a transmit times out we dump the card into control mode and just
396 * start again. It happens enough that it isnt worth logging.
397 *
398 * We avoid holding the spin locks when doing the packet load to the board.
399 * The device is very slow, and its DMA mode is even slower. If we held the
400 * lock while loading 1500 bytes onto the controller we would drop a lot of
401 * serial port characters. This requires we do extra locking, but we have
402 * no real choice.
403 */
404
el_start_xmit(struct sk_buff * skb,struct net_device * dev)405 static int el_start_xmit(struct sk_buff *skb, struct net_device *dev)
406 {
407 struct net_local *lp = netdev_priv(dev);
408 int ioaddr = dev->base_addr;
409 unsigned long flags;
410
411 /*
412 * Avoid incoming interrupts between us flipping txing and flipping
413 * mode as the driver assumes txing is a faithful indicator of card
414 * state
415 */
416
417 spin_lock_irqsave(&lp->lock, flags);
418
419 /*
420 * Avoid timer-based retransmission conflicts.
421 */
422
423 netif_stop_queue(dev);
424
425 do {
426 int len = skb->len;
427 int pad = 0;
428 int gp_start;
429 unsigned char *buf = skb->data;
430
431 if (len < ETH_ZLEN)
432 pad = ETH_ZLEN - len;
433
434 gp_start = 0x800 - (len + pad);
435
436 lp->tx_pkt_start = gp_start;
437 lp->collisions = 0;
438
439 dev->stats.tx_bytes += skb->len;
440
441 /*
442 * Command mode with status cleared should [in theory]
443 * mean no more interrupts can be pending on the card.
444 */
445
446 outb_p(AX_SYS, AX_CMD);
447 inb_p(RX_STATUS);
448 inb_p(TX_STATUS);
449
450 lp->loading = 1;
451 lp->txing = 1;
452
453 /*
454 * Turn interrupts back on while we spend a pleasant
455 * afternoon loading bytes into the board
456 */
457
458 spin_unlock_irqrestore(&lp->lock, flags);
459
460 /* Set rx packet area to 0. */
461 outw(0x00, RX_BUF_CLR);
462 /* aim - packet will be loaded into buffer start */
463 outw(gp_start, GP_LOW);
464 /* load buffer (usual thing each byte increments the pointer) */
465 outsb(DATAPORT, buf, len);
466 if (pad) {
467 while (pad--) /* Zero fill buffer tail */
468 outb(0, DATAPORT);
469 }
470 /* the board reuses the same register */
471 outw(gp_start, GP_LOW);
472
473 if (lp->loading != 2) {
474 /* fire ... Trigger xmit. */
475 outb(AX_XMIT, AX_CMD);
476 lp->loading = 0;
477 dev->trans_start = jiffies;
478 if (el_debug > 2)
479 printk(KERN_DEBUG " queued xmit.\n");
480 dev_kfree_skb(skb);
481 return 0;
482 }
483 /* A receive upset our load, despite our best efforts */
484 if (el_debug > 2)
485 printk(KERN_DEBUG "%s: burped during tx load.\n",
486 dev->name);
487 spin_lock_irqsave(&lp->lock, flags);
488 } while (1);
489 }
490
491 /**
492 * el_interrupt:
493 * @irq: Interrupt number
494 * @dev_id: The 3c501 that burped
495 *
496 * Handle the ether interface interrupts. The 3c501 needs a lot more
497 * hand holding than most cards. In particular we get a transmit interrupt
498 * with a collision error because the board firmware isnt capable of rewinding
499 * its own transmit buffer pointers. It can however count to 16 for us.
500 *
501 * On the receive side the card is also very dumb. It has no buffering to
502 * speak of. We simply pull the packet out of its PIO buffer (which is slow)
503 * and queue it for the kernel. Then we reset the card for the next packet.
504 *
505 * We sometimes get surprise interrupts late both because the SMP IRQ delivery
506 * is message passing and because the card sometimes seems to deliver late. I
507 * think if it is part way through a receive and the mode is changed it carries
508 * on receiving and sends us an interrupt. We have to band aid all these cases
509 * to get a sensible 150kBytes/second performance. Even then you want a small
510 * TCP window.
511 */
512
el_interrupt(int irq,void * dev_id)513 static irqreturn_t el_interrupt(int irq, void *dev_id)
514 {
515 struct net_device *dev = dev_id;
516 struct net_local *lp;
517 int ioaddr;
518 int axsr; /* Aux. status reg. */
519
520 ioaddr = dev->base_addr;
521 lp = netdev_priv(dev);
522
523 spin_lock(&lp->lock);
524
525 /*
526 * What happened ?
527 */
528
529 axsr = inb(AX_STATUS);
530
531 /*
532 * Log it
533 */
534
535 if (el_debug > 3)
536 printk(KERN_DEBUG "%s: el_interrupt() aux=%#02x",
537 dev->name, axsr);
538
539 if (lp->loading == 1 && !lp->txing)
540 printk(KERN_WARNING "%s: Inconsistent state loading while not in tx\n",
541 dev->name);
542
543 if (lp->txing) {
544 /*
545 * Board in transmit mode. May be loading. If we are
546 * loading we shouldn't have got this.
547 */
548 int txsr = inb(TX_STATUS);
549
550 if (lp->loading == 1) {
551 if (el_debug > 2) {
552 printk(KERN_DEBUG "%s: Interrupt while loading [",
553 dev->name);
554 printk(" txsr=%02x gp=%04x rp=%04x]\n",
555 txsr, inw(GP_LOW), inw(RX_LOW));
556 }
557 /* Force a reload */
558 lp->loading = 2;
559 spin_unlock(&lp->lock);
560 goto out;
561 }
562 if (el_debug > 6)
563 printk(KERN_DEBUG " txsr=%02x gp=%04x rp=%04x",
564 txsr, inw(GP_LOW), inw(RX_LOW));
565
566 if ((axsr & 0x80) && (txsr & TX_READY) == 0) {
567 /*
568 * FIXME: is there a logic to whether to keep
569 * on trying or reset immediately ?
570 */
571 if (el_debug > 1)
572 printk(KERN_DEBUG "%s: Unusual interrupt during Tx, txsr=%02x axsr=%02x gp=%03x rp=%03x.\n",
573 dev->name, txsr, axsr,
574 inw(ioaddr + EL1_DATAPTR),
575 inw(ioaddr + EL1_RXPTR));
576 lp->txing = 0;
577 netif_wake_queue(dev);
578 } else if (txsr & TX_16COLLISIONS) {
579 /*
580 * Timed out
581 */
582 if (el_debug)
583 printk(KERN_DEBUG "%s: Transmit failed 16 times, Ethernet jammed?\n", dev->name);
584 outb(AX_SYS, AX_CMD);
585 lp->txing = 0;
586 dev->stats.tx_aborted_errors++;
587 netif_wake_queue(dev);
588 } else if (txsr & TX_COLLISION) {
589 /*
590 * Retrigger xmit.
591 */
592
593 if (el_debug > 6)
594 printk(KERN_DEBUG " retransmitting after a collision.\n");
595 /*
596 * Poor little chip can't reset its own start
597 * pointer
598 */
599
600 outb(AX_SYS, AX_CMD);
601 outw(lp->tx_pkt_start, GP_LOW);
602 outb(AX_XMIT, AX_CMD);
603 dev->stats.collisions++;
604 spin_unlock(&lp->lock);
605 goto out;
606 } else {
607 /*
608 * It worked.. we will now fall through and receive
609 */
610 dev->stats.tx_packets++;
611 if (el_debug > 6)
612 printk(KERN_DEBUG " Tx succeeded %s\n",
613 (txsr & TX_RDY) ? "." :
614 "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 printk(KERN_DEBUG " rxsr=%02x txsr=%02x rp=%04x", rxsr, inb(TX_STATUS), inw(RX_LOW));
630 /*
631 * Just reading rx_status fixes most errors.
632 */
633 if (rxsr & RX_MISSED)
634 dev->stats.rx_missed_errors++;
635 else if (rxsr & RX_RUNT) {
636 /* Handled to avoid board lock-up. */
637 dev->stats.rx_length_errors++;
638 if (el_debug > 5)
639 printk(KERN_DEBUG " runt.\n");
640 } else if (rxsr & RX_GOOD) {
641 /*
642 * Receive worked.
643 */
644 el_receive(dev);
645 } else {
646 /*
647 * Nothing? Something is broken!
648 */
649 if (el_debug > 2)
650 printk(KERN_DEBUG "%s: No packet seen, rxsr=%02x **resetting 3c501***\n",
651 dev->name, rxsr);
652 el_reset(dev);
653 }
654 if (el_debug > 3)
655 printk(KERN_DEBUG ".\n");
656 }
657
658 /*
659 * Move into receive mode
660 */
661
662 outb(AX_RX, AX_CMD);
663 outw(0x00, RX_BUF_CLR);
664 inb(RX_STATUS); /* Be certain that interrupts are cleared. */
665 inb(TX_STATUS);
666 spin_unlock(&lp->lock);
667 out:
668 return IRQ_HANDLED;
669 }
670
671
672 /**
673 * el_receive:
674 * @dev: Device to pull the packets from
675 *
676 * We have a good packet. Well, not really "good", just mostly not broken.
677 * We must check everything to see if it is good. In particular we occasionally
678 * get wild packet sizes from the card. If the packet seems sane we PIO it
679 * off the card and queue it for the protocol layers.
680 */
681
el_receive(struct net_device * dev)682 static void el_receive(struct net_device *dev)
683 {
684 int ioaddr = dev->base_addr;
685 int pkt_len;
686 struct sk_buff *skb;
687
688 pkt_len = inw(RX_LOW);
689
690 if (el_debug > 4)
691 printk(KERN_DEBUG " el_receive %d.\n", pkt_len);
692
693 if (pkt_len < 60 || pkt_len > 1536) {
694 if (el_debug)
695 printk(KERN_DEBUG "%s: bogus packet, length=%d\n",
696 dev->name, pkt_len);
697 dev->stats.rx_over_errors++;
698 return;
699 }
700
701 /*
702 * Command mode so we can empty the buffer
703 */
704
705 outb(AX_SYS, AX_CMD);
706 skb = dev_alloc_skb(pkt_len+2);
707
708 /*
709 * Start of frame
710 */
711
712 outw(0x00, GP_LOW);
713 if (skb == NULL) {
714 printk(KERN_INFO "%s: Memory squeeze, dropping packet.\n",
715 dev->name);
716 dev->stats.rx_dropped++;
717 return;
718 } else {
719 skb_reserve(skb, 2); /* Force 16 byte alignment */
720 /*
721 * The read increments through the bytes. The interrupt
722 * handler will fix the pointer when it returns to
723 * receive mode.
724 */
725 insb(DATAPORT, skb_put(skb, pkt_len), pkt_len);
726 skb->protocol = eth_type_trans(skb, dev);
727 netif_rx(skb);
728 dev->stats.rx_packets++;
729 dev->stats.rx_bytes += pkt_len;
730 }
731 return;
732 }
733
734 /**
735 * el_reset: Reset a 3c501 card
736 * @dev: The 3c501 card about to get zapped
737 *
738 * Even resetting a 3c501 isnt simple. When you activate reset it loses all
739 * its configuration. You must hold the lock when doing this. The function
740 * cannot take the lock itself as it is callable from the irq handler.
741 */
742
el_reset(struct net_device * dev)743 static void el_reset(struct net_device *dev)
744 {
745 struct net_local *lp = netdev_priv(dev);
746 int ioaddr = dev->base_addr;
747
748 if (el_debug > 2)
749 printk(KERN_INFO "3c501 reset...");
750 outb(AX_RESET, AX_CMD); /* Reset the chip */
751 /* Aux control, irq and loopback enabled */
752 outb(AX_LOOP, AX_CMD);
753 {
754 int i;
755 for (i = 0; i < 6; i++) /* Set the station address. */
756 outb(dev->dev_addr[i], ioaddr + i);
757 }
758
759 outw(0, RX_BUF_CLR); /* Set rx packet area to 0. */
760 outb(TX_NORM, TX_CMD); /* tx irq on done, collision */
761 outb(RX_NORM, RX_CMD); /* Set Rx commands. */
762 inb(RX_STATUS); /* Clear status. */
763 inb(TX_STATUS);
764 lp->txing = 0;
765 }
766
767 /**
768 * el1_close:
769 * @dev: 3c501 card to shut down
770 *
771 * Close a 3c501 card. The IFF_UP flag has been cleared by the user via
772 * the SIOCSIFFLAGS ioctl. We stop any further transmissions being queued,
773 * and then disable the interrupts. Finally we reset the chip. The effects
774 * of the rest will be cleaned up by #el1_open. Always returns 0 indicating
775 * a success.
776 */
777
el1_close(struct net_device * dev)778 static int el1_close(struct net_device *dev)
779 {
780 int ioaddr = dev->base_addr;
781
782 if (el_debug > 2)
783 printk(KERN_INFO "%s: Shutting down Ethernet card at %#x.\n",
784 dev->name, ioaddr);
785
786 netif_stop_queue(dev);
787
788 /*
789 * Free and disable the IRQ.
790 */
791
792 free_irq(dev->irq, dev);
793 outb(AX_RESET, AX_CMD); /* Reset the chip */
794
795 return 0;
796 }
797
798 /**
799 * set_multicast_list:
800 * @dev: The device to adjust
801 *
802 * Set or clear the multicast filter for this adaptor to use the best-effort
803 * filtering supported. The 3c501 supports only three modes of filtering.
804 * It always receives broadcasts and packets for itself. You can choose to
805 * optionally receive all packets, or all multicast packets on top of this.
806 */
807
set_multicast_list(struct net_device * dev)808 static void set_multicast_list(struct net_device *dev)
809 {
810 int ioaddr = dev->base_addr;
811
812 if (dev->flags & IFF_PROMISC) {
813 outb(RX_PROM, RX_CMD);
814 inb(RX_STATUS);
815 } else if (dev->mc_list || dev->flags & IFF_ALLMULTI) {
816 /* Multicast or all multicast is the same */
817 outb(RX_MULT, RX_CMD);
818 inb(RX_STATUS); /* Clear status. */
819 } else {
820 outb(RX_NORM, RX_CMD);
821 inb(RX_STATUS);
822 }
823 }
824
825
netdev_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)826 static void netdev_get_drvinfo(struct net_device *dev,
827 struct ethtool_drvinfo *info)
828 {
829 strcpy(info->driver, DRV_NAME);
830 strcpy(info->version, DRV_VERSION);
831 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
832 }
833
netdev_get_msglevel(struct net_device * dev)834 static u32 netdev_get_msglevel(struct net_device *dev)
835 {
836 return debug;
837 }
838
netdev_set_msglevel(struct net_device * dev,u32 level)839 static void netdev_set_msglevel(struct net_device *dev, u32 level)
840 {
841 debug = level;
842 }
843
844 static const struct ethtool_ops netdev_ethtool_ops = {
845 .get_drvinfo = netdev_get_drvinfo,
846 .get_msglevel = netdev_get_msglevel,
847 .set_msglevel = netdev_set_msglevel,
848 };
849
850 #ifdef MODULE
851
852 static struct net_device *dev_3c501;
853
854 module_param(io, int, 0);
855 module_param(irq, int, 0);
856 MODULE_PARM_DESC(io, "EtherLink I/O base address");
857 MODULE_PARM_DESC(irq, "EtherLink IRQ number");
858
859 /**
860 * init_module:
861 *
862 * When the driver is loaded as a module this function is called. We fake up
863 * a device structure with the base I/O and interrupt set as if it were being
864 * called from Space.c. This minimises the extra code that would otherwise
865 * be required.
866 *
867 * Returns 0 for success or -EIO if a card is not found. Returning an error
868 * here also causes the module to be unloaded
869 */
870
init_module(void)871 int __init init_module(void)
872 {
873 dev_3c501 = el1_probe(-1);
874 if (IS_ERR(dev_3c501))
875 return PTR_ERR(dev_3c501);
876 return 0;
877 }
878
879 /**
880 * cleanup_module:
881 *
882 * The module is being unloaded. We unhook our network device from the system
883 * and then free up the resources we took when the card was found.
884 */
885
cleanup_module(void)886 void __exit cleanup_module(void)
887 {
888 struct net_device *dev = dev_3c501;
889 unregister_netdev(dev);
890 release_region(dev->base_addr, EL1_IO_EXTENT);
891 free_netdev(dev);
892 }
893
894 #endif /* MODULE */
895
896 MODULE_AUTHOR("Donald Becker, Alan Cox");
897 MODULE_DESCRIPTION("Support for the ancient 3Com 3c501 ethernet card");
898 MODULE_LICENSE("GPL");
899
900