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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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.
Alan Coxa35f5de2007-11-19 15:02:32 +000020 Alan Cox <Alan.Cox@linux.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
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.
Alan Coxa35f5de2007-11-19 15:02:32 +000032 19950402 Alan Cox <Alan.Cox@linux.org>
Jeff Garzik6aa20a22006-09-13 13:24:59 -040033
34 Cleaned up for 2.3.x because we broke SMP now.
Alan Coxa35f5de2007-11-19 15:02:32 +000035 20000208 Alan Cox <alan@redhat.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37 Check up pass for 2.5. Nothing significant changed
Alan Coxa35f5de2007-11-19 15:02:32 +000038 20021009 Alan Cox <alan@redhat.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Jeff Garzik6aa20a22006-09-13 13:24:59 -040040 Fixed zero fill corner case
Alan Coxa35f5de2007-11-19 15:02:32 +000041 20030104 Alan Cox <alan@redhat.com>
Jeff Garzik6aa20a22006-09-13 13:24:59 -040042
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 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
Jeff Garzik6aa20a22006-09-13 13:24:59 -040061 * of historical interest anyway.
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 *
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
Jeff Garzik6aa20a22006-09-13 13:24:59 -040083 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 * 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
106static 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123#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
Alan Coxa35f5de2007-11-19 15:02:32 +0000142static int io = 0x280;
143static int irq = 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144static int mem_start;
145
146/**
147 * el1_probe: - probe for a 3c501
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400148 * @dev: The device structure passed in to probe.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 *
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 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159struct 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 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;
193out1:
194 release_region(dev->base_addr, EL1_IO_EXTENT);
195out:
196 free_netdev(dev);
197 return ERR_PTR(err);
198}
199
200/**
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400201 * el1_probe1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 * @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
213static 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
Alan Coxa35f5de2007-11-19 15:02:32 +0000232 for (i = 0; i < 6; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 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
Alan Coxa35f5de2007-11-19 15:02:32 +0000242 && station_addr[2] == 0x8c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 mname = "3c501";
Alan Coxa35f5de2007-11-19 15:02:32 +0000244 else if (station_addr[0] == 0x00 && station_addr[1] == 0x80
245 && station_addr[2] == 0xC8)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 mname = "NP943";
Alan Coxa35f5de2007-11-19 15:02:32 +0000247 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 release_region(ioaddr, EL1_IO_EXTENT);
249 return -ENODEV;
250 }
251
252 /*
Alan Coxa35f5de2007-11-19 15:02:32 +0000253 * We auto-IRQ by shutting off the interrupt line and letting it
254 * float high.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 */
256
257 dev->irq = irq;
258
Alan Coxa35f5de2007-11-19 15:02:32 +0000259 if (dev->irq < 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 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
Alan Coxa35f5de2007-11-19 15:02:32 +0000272 if (autoirq == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 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
Alan Coxa35f5de2007-11-19 15:02:32 +0000289 printk(KERN_INFO "%s: %s EtherLink at %#lx, using %sIRQ %d.\n",
290 dev->name, mname, dev->base_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 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 memset(dev->priv, 0, sizeof(struct net_local));
301 lp = netdev_priv(dev);
302 spin_lock_init(&lp->lock);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 /*
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 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
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400323 * IFF_UP this function is called. It is only called when the change
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 * 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
331static 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
Alan Coxa35f5de2007-11-19 15:02:32 +0000341 retval = request_irq(dev->irq, &el_interrupt, 0, dev->name, dev);
342 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 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 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400363
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364static void el_timeout(struct net_device *dev)
365{
366 struct net_local *lp = netdev_priv(dev);
367 int ioaddr = dev->base_addr;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 if (el_debug)
Alan Coxa35f5de2007-11-19 15:02:32 +0000370 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));
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700373 dev->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 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
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383/**
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
405static 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);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 /*
420 * Avoid timer-based retransmission conflicts.
421 */
422
423 netif_stop_queue(dev);
424
Alan Coxa35f5de2007-11-19 15:02:32 +0000425 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 int len = skb->len;
427 int pad = 0;
428 int gp_start;
429 unsigned char *buf = skb->data;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (len < ETH_ZLEN)
432 pad = ETH_ZLEN - len;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400433
Alan Coxa35f5de2007-11-19 15:02:32 +0000434 gp_start = 0x800 - (len + pad);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 lp->tx_pkt_start = gp_start;
Alan Coxa35f5de2007-11-19 15:02:32 +0000437 lp->collisions = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700439 dev->stats.tx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
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 /*
Alan Coxa35f5de2007-11-19 15:02:32 +0000454 * Turn interrupts back on while we spend a pleasant
455 * afternoon loading bytes into the board
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 */
457
458 spin_unlock_irqrestore(&lp->lock, flags);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400459
Alan Coxa35f5de2007-11-19 15:02:32 +0000460 /* 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 if (pad) {
Alan Coxa35f5de2007-11-19 15:02:32 +0000467 while (pad--) /* Zero fill buffer tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 outb(0, DATAPORT);
469 }
Alan Coxa35f5de2007-11-19 15:02:32 +0000470 /* the board reuses the same register */
471 outw(gp_start, GP_LOW);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400472
Alan Coxa35f5de2007-11-19 15:02:32 +0000473 if (lp->loading != 2) {
474 /* fire ... Trigger xmit. */
475 outb(AX_XMIT, AX_CMD);
476 lp->loading = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 dev->trans_start = jiffies;
478 if (el_debug > 2)
479 printk(KERN_DEBUG " queued xmit.\n");
Alan Coxa35f5de2007-11-19 15:02:32 +0000480 dev_kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 return 0;
482 }
483 /* A receive upset our load, despite our best efforts */
Alan Coxa35f5de2007-11-19 15:02:32 +0000484 if (el_debug > 2)
485 printk(KERN_DEBUG "%s: burped during tx load.\n",
486 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 spin_lock_irqsave(&lp->lock, flags);
488 }
Alan Coxa35f5de2007-11-19 15:02:32 +0000489 while (1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491}
492
493/**
494 * el_interrupt:
495 * @irq: Interrupt number
496 * @dev_id: The 3c501 that burped
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 *
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400498 * Handle the ether interface interrupts. The 3c501 needs a lot more
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 * hand holding than most cards. In particular we get a transmit interrupt
500 * with a collision error because the board firmware isnt capable of rewinding
501 * its own transmit buffer pointers. It can however count to 16 for us.
502 *
503 * On the receive side the card is also very dumb. It has no buffering to
504 * speak of. We simply pull the packet out of its PIO buffer (which is slow)
505 * and queue it for the kernel. Then we reset the card for the next packet.
506 *
Andreas Mohrd6e05ed2006-06-26 18:35:02 +0200507 * We sometimes get surprise interrupts late both because the SMP IRQ delivery
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 * is message passing and because the card sometimes seems to deliver late. I
509 * think if it is part way through a receive and the mode is changed it carries
510 * on receiving and sends us an interrupt. We have to band aid all these cases
Andreas Mohrd6e05ed2006-06-26 18:35:02 +0200511 * to get a sensible 150kBytes/second performance. Even then you want a small
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 * TCP window.
513 */
514
David Howells7d12e782006-10-05 14:55:46 +0100515static irqreturn_t el_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516{
517 struct net_device *dev = dev_id;
518 struct net_local *lp;
519 int ioaddr;
520 int axsr; /* Aux. status reg. */
521
522 ioaddr = dev->base_addr;
523 lp = netdev_priv(dev);
524
525 spin_lock(&lp->lock);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 /*
528 * What happened ?
529 */
530
531 axsr = inb(AX_STATUS);
532
533 /*
534 * Log it
535 */
536
537 if (el_debug > 3)
Alan Coxa35f5de2007-11-19 15:02:32 +0000538 printk(KERN_DEBUG "%s: el_interrupt() aux=%#02x",
539 dev->name, axsr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Alan Coxa35f5de2007-11-19 15:02:32 +0000541 if (lp->loading == 1 && !lp->txing)
542 printk(KERN_WARNING "%s: Inconsistent state loading while not in tx\n",
543 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Alan Coxa35f5de2007-11-19 15:02:32 +0000545 if (lp->txing) {
546 /*
547 * Board in transmit mode. May be loading. If we are
548 * loading we shouldn't have got this.
549 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 int txsr = inb(TX_STATUS);
551
Alan Coxa35f5de2007-11-19 15:02:32 +0000552 if (lp->loading == 1) {
553 if (el_debug > 2) {
554 printk(KERN_DEBUG "%s: Interrupt while loading [",
555 dev->name);
556 printk(" txsr=%02x gp=%04x rp=%04x]\n",
557 txsr, inw(GP_LOW), inw(RX_LOW));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 }
Alan Coxa35f5de2007-11-19 15:02:32 +0000559 /* Force a reload */
560 lp->loading = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 spin_unlock(&lp->lock);
562 goto out;
563 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 if (el_debug > 6)
Alan Coxa35f5de2007-11-19 15:02:32 +0000565 printk(KERN_DEBUG " txsr=%02x gp=%04x rp=%04x",
566 txsr, inw(GP_LOW), inw(RX_LOW));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Alan Coxa35f5de2007-11-19 15:02:32 +0000568 if ((axsr & 0x80) && (txsr & TX_READY) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 /*
Alan Coxa35f5de2007-11-19 15:02:32 +0000570 * FIXME: is there a logic to whether to keep
571 * on trying or reset immediately ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 */
Alan Coxa35f5de2007-11-19 15:02:32 +0000573 if (el_debug > 1)
574 printk(KERN_DEBUG "%s: Unusual interrupt during Tx, txsr=%02x axsr=%02x gp=%03x rp=%03x.\n",
575 dev->name, txsr, axsr,
576 inw(ioaddr + EL1_DATAPTR),
577 inw(ioaddr + EL1_RXPTR));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 lp->txing = 0;
579 netif_wake_queue(dev);
Alan Coxa35f5de2007-11-19 15:02:32 +0000580 } else if (txsr & TX_16COLLISIONS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 /*
582 * Timed out
583 */
584 if (el_debug)
Alan Coxa35f5de2007-11-19 15:02:32 +0000585 printk(KERN_DEBUG "%s: Transmit failed 16 times, Ethernet jammed?\n", dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 outb(AX_SYS, AX_CMD);
587 lp->txing = 0;
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700588 dev->stats.tx_aborted_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 netif_wake_queue(dev);
Alan Coxa35f5de2007-11-19 15:02:32 +0000590 } else if (txsr & TX_COLLISION) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 /*
592 * Retrigger xmit.
593 */
594
595 if (el_debug > 6)
596 printk(KERN_DEBUG " retransmitting after a collision.\n");
597 /*
Alan Coxa35f5de2007-11-19 15:02:32 +0000598 * Poor little chip can't reset its own start
599 * pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 */
601
602 outb(AX_SYS, AX_CMD);
603 outw(lp->tx_pkt_start, GP_LOW);
604 outb(AX_XMIT, AX_CMD);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700605 dev->stats.collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 spin_unlock(&lp->lock);
607 goto out;
Alan Coxa35f5de2007-11-19 15:02:32 +0000608 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 /*
610 * It worked.. we will now fall through and receive
611 */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700612 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 if (el_debug > 6)
614 printk(KERN_DEBUG " Tx succeeded %s\n",
Alan Coxa35f5de2007-11-19 15:02:32 +0000615 (txsr & TX_RDY) ? "." : "but tx is busy!");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 /*
617 * This is safe the interrupt is atomic WRT itself.
618 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 lp->txing = 0;
Alan Coxa35f5de2007-11-19 15:02:32 +0000620 /* In case more to transmit */
621 netif_wake_queue(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 }
Alan Coxa35f5de2007-11-19 15:02:32 +0000623 } else {
624 /*
625 * In receive mode.
626 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
628 int rxsr = inb(RX_STATUS);
629 if (el_debug > 5)
Alan Coxa35f5de2007-11-19 15:02:32 +0000630 printk(KERN_DEBUG " rxsr=%02x txsr=%02x rp=%04x", rxsr, inb(TX_STATUS), inw(RX_LOW));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 /*
632 * Just reading rx_status fixes most errors.
633 */
634 if (rxsr & RX_MISSED)
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700635 dev->stats.rx_missed_errors++;
Alan Coxa35f5de2007-11-19 15:02:32 +0000636 else if (rxsr & RX_RUNT) {
637 /* Handled to avoid board lock-up. */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700638 dev->stats.rx_length_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 if (el_debug > 5)
640 printk(KERN_DEBUG " runt.\n");
Alan Coxa35f5de2007-11-19 15:02:32 +0000641 } else if (rxsr & RX_GOOD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 /*
643 * Receive worked.
644 */
645 el_receive(dev);
Alan Coxa35f5de2007-11-19 15:02:32 +0000646 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 /*
648 * Nothing? Something is broken!
649 */
650 if (el_debug > 2)
651 printk(KERN_DEBUG "%s: No packet seen, rxsr=%02x **resetting 3c501***\n",
652 dev->name, rxsr);
653 el_reset(dev);
654 }
655 if (el_debug > 3)
656 printk(KERN_DEBUG ".\n");
657 }
658
659 /*
660 * Move into receive mode
661 */
662
663 outb(AX_RX, AX_CMD);
664 outw(0x00, RX_BUF_CLR);
665 inb(RX_STATUS); /* Be certain that interrupts are cleared. */
666 inb(TX_STATUS);
667 spin_unlock(&lp->lock);
668out:
669 return IRQ_HANDLED;
670}
671
672
673/**
674 * el_receive:
675 * @dev: Device to pull the packets from
676 *
677 * We have a good packet. Well, not really "good", just mostly not broken.
678 * We must check everything to see if it is good. In particular we occasionally
679 * get wild packet sizes from the card. If the packet seems sane we PIO it
680 * off the card and queue it for the protocol layers.
681 */
682
683static void el_receive(struct net_device *dev)
684{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 int ioaddr = dev->base_addr;
686 int pkt_len;
687 struct sk_buff *skb;
688
689 pkt_len = inw(RX_LOW);
690
691 if (el_debug > 4)
692 printk(KERN_DEBUG " el_receive %d.\n", pkt_len);
693
Alan Coxa35f5de2007-11-19 15:02:32 +0000694 if (pkt_len < 60 || pkt_len > 1536) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 if (el_debug)
696 printk(KERN_DEBUG "%s: bogus packet, length=%d\n", dev->name, pkt_len);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700697 dev->stats.rx_over_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 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);
Alan Coxa35f5de2007-11-19 15:02:32 +0000713 if (skb == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 printk(KERN_INFO "%s: Memory squeeze, dropping packet.\n", dev->name);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700715 dev->stats.rx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 return;
Alan Coxa35f5de2007-11-19 15:02:32 +0000717 } else {
718 skb_reserve(skb, 2); /* Force 16 byte alignment */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 /*
720 * The read increments through the bytes. The interrupt
721 * handler will fix the pointer when it returns to
722 * receive mode.
723 */
Alan Coxa35f5de2007-11-19 15:02:32 +0000724 insb(DATAPORT, skb_put(skb, pkt_len), pkt_len);
725 skb->protocol = eth_type_trans(skb, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 netif_rx(skb);
727 dev->last_rx = jiffies;
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700728 dev->stats.rx_packets++;
Alan Coxa35f5de2007-11-19 15:02:32 +0000729 dev->stats.rx_bytes += pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 }
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
743static void el_reset(struct net_device *dev)
744{
745 struct net_local *lp = netdev_priv(dev);
746 int ioaddr = dev->base_addr;
747
Alan Coxa35f5de2007-11-19 15:02:32 +0000748 if (el_debug > 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 printk(KERN_INFO "3c501 reset...");
750 outb(AX_RESET, AX_CMD); /* Reset the chip */
751 outb(AX_LOOP, AX_CMD); /* Aux control, irq and loopback enabled */
752 {
753 int i;
754 for (i = 0; i < 6; i++) /* Set the station address. */
755 outb(dev->dev_addr[i], ioaddr + i);
756 }
757
758 outw(0, RX_BUF_CLR); /* Set rx packet area to 0. */
759 outb(TX_NORM, TX_CMD); /* tx irq on done, collision */
760 outb(RX_NORM, RX_CMD); /* Set Rx commands. */
761 inb(RX_STATUS); /* Clear status. */
762 inb(TX_STATUS);
763 lp->txing = 0;
764}
765
766/**
767 * el1_close:
768 * @dev: 3c501 card to shut down
769 *
770 * Close a 3c501 card. The IFF_UP flag has been cleared by the user via
771 * the SIOCSIFFLAGS ioctl. We stop any further transmissions being queued,
772 * and then disable the interrupts. Finally we reset the chip. The effects
773 * of the rest will be cleaned up by #el1_open. Always returns 0 indicating
774 * a success.
775 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400776
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777static int el1_close(struct net_device *dev)
778{
779 int ioaddr = dev->base_addr;
780
781 if (el_debug > 2)
Alan Coxa35f5de2007-11-19 15:02:32 +0000782 printk(KERN_INFO "%s: Shutting down Ethernet card at %#x.\n",
783 dev->name, ioaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785 netif_stop_queue(dev);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400786
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 /*
788 * Free and disable the IRQ.
789 */
790
791 free_irq(dev->irq, dev);
792 outb(AX_RESET, AX_CMD); /* Reset the chip */
793
794 return 0;
795}
796
797/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 * set_multicast_list:
799 * @dev: The device to adjust
800 *
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400801 * Set or clear the multicast filter for this adaptor to use the best-effort
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 * filtering supported. The 3c501 supports only three modes of filtering.
803 * It always receives broadcasts and packets for itself. You can choose to
804 * optionally receive all packets, or all multicast packets on top of this.
805 */
806
807static void set_multicast_list(struct net_device *dev)
808{
809 int ioaddr = dev->base_addr;
810
Alan Coxa35f5de2007-11-19 15:02:32 +0000811 if (dev->flags & IFF_PROMISC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 outb(RX_PROM, RX_CMD);
813 inb(RX_STATUS);
Alan Coxa35f5de2007-11-19 15:02:32 +0000814 } else if (dev->mc_list || dev->flags & IFF_ALLMULTI) {
815 /* Multicast or all multicast is the same */
816 outb(RX_MULT, RX_CMD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 inb(RX_STATUS); /* Clear status. */
Alan Coxa35f5de2007-11-19 15:02:32 +0000818 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 outb(RX_NORM, RX_CMD);
820 inb(RX_STATUS);
821 }
822}
823
824
825static void netdev_get_drvinfo(struct net_device *dev,
826 struct ethtool_drvinfo *info)
827{
828 strcpy(info->driver, DRV_NAME);
829 strcpy(info->version, DRV_VERSION);
830 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
831}
832
833static u32 netdev_get_msglevel(struct net_device *dev)
834{
835 return debug;
836}
837
838static void netdev_set_msglevel(struct net_device *dev, u32 level)
839{
840 debug = level;
841}
842
Jeff Garzik7282d492006-09-13 14:30:00 -0400843static const struct ethtool_ops netdev_ethtool_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 .get_drvinfo = netdev_get_drvinfo,
845 .get_msglevel = netdev_get_msglevel,
846 .set_msglevel = netdev_set_msglevel,
847};
848
849#ifdef MODULE
850
851static struct net_device *dev_3c501;
852
853module_param(io, int, 0);
854module_param(irq, int, 0);
855MODULE_PARM_DESC(io, "EtherLink I/O base address");
856MODULE_PARM_DESC(irq, "EtherLink IRQ number");
857
858/**
859 * init_module:
860 *
861 * When the driver is loaded as a module this function is called. We fake up
862 * a device structure with the base I/O and interrupt set as if it were being
863 * called from Space.c. This minimises the extra code that would otherwise
864 * be required.
865 *
866 * Returns 0 for success or -EIO if a card is not found. Returning an error
867 * here also causes the module to be unloaded
868 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400869
Randy Dunlap96e672c2006-06-10 13:33:48 -0700870int __init init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871{
872 dev_3c501 = el1_probe(-1);
873 if (IS_ERR(dev_3c501))
874 return PTR_ERR(dev_3c501);
875 return 0;
876}
877
878/**
879 * cleanup_module:
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400880 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 * The module is being unloaded. We unhook our network device from the system
882 * and then free up the resources we took when the card was found.
883 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400884
Al Viroafc8eb42006-06-14 18:50:53 -0400885void __exit cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
887 struct net_device *dev = dev_3c501;
888 unregister_netdev(dev);
889 release_region(dev->base_addr, EL1_IO_EXTENT);
890 free_netdev(dev);
891}
892
893#endif /* MODULE */
894
895MODULE_AUTHOR("Donald Becker, Alan Cox");
896MODULE_DESCRIPTION("Support for the ancient 3Com 3c501 ethernet card");
897MODULE_LICENSE("GPL");
898