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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 Cox113aa832008-10-13 19:01:08 -070020 Alan Cox <alan@lxorguk.ukuu.org.uk>
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 Cox113aa832008-10-13 19:01:08 -070032 19950402 Alan Cox <alan@lxorguk.ukuu.org.uk>
Jeff Garzik6aa20a22006-09-13 13:24:59 -040033
34 Cleaned up for 2.3.x because we broke SMP now.
Alan Cox113aa832008-10-13 19:01:08 -070035 20000208 Alan Cox <alan@lxorguk.ukuu.org.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37 Check up pass for 2.5. Nothing significant changed
Alan Cox113aa832008-10-13 19:01:08 -070038 20021009 Alan Cox <alan@lxorguk.ukuu.org.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Jeff Garzik6aa20a22006-09-13 13:24:59 -040040 Fixed zero fill corner case
Alan Cox113aa832008-10-13 19:01:08 -070041 20030104 Alan Cox <alan@lxorguk.ukuu.org.uk>
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[] =
Alan Cox113aa832008-10-13 19:01:08 -0700107 DRV_NAME ".c: " DRV_VERSION " Alan Cox (alan@lxorguk.ukuu.org.uk).\n";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
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
Stephen Hemminger878f6482009-01-09 13:01:11 +0000200static const struct net_device_ops el_netdev_ops = {
201 .ndo_open = el_open,
202 .ndo_stop = el1_close,
203 .ndo_start_xmit = el_start_xmit,
204 .ndo_tx_timeout = el_timeout,
205 .ndo_set_multicast_list = set_multicast_list,
206 .ndo_change_mtu = eth_change_mtu,
207 .ndo_set_mac_address = eth_mac_addr,
208 .ndo_validate_addr = eth_validate_addr,
209};
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211/**
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400212 * el1_probe1:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 * @dev: The device structure to use
214 * @ioaddr: An I/O address to probe at.
215 *
216 * The actual probe. This is iterated over by #el1_probe in order to
217 * check all the applicable device locations.
218 *
219 * Returns 0 for a success, in which case the device is activated,
220 * EAGAIN if the IRQ is in use by another driver, and ENODEV if the
221 * board cannot be found.
222 */
223
224static int __init el1_probe1(struct net_device *dev, int ioaddr)
225{
226 struct net_local *lp;
227 const char *mname; /* Vendor name */
228 unsigned char station_addr[6];
229 int autoirq = 0;
230 int i;
231
232 /*
233 * Reserve I/O resource for exclusive use by this driver
234 */
235
236 if (!request_region(ioaddr, EL1_IO_EXTENT, DRV_NAME))
237 return -ENODEV;
238
239 /*
240 * Read the station address PROM data from the special port.
241 */
242
Alan Coxa35f5de2007-11-19 15:02:32 +0000243 for (i = 0; i < 6; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 outw(i, ioaddr + EL1_DATAPTR);
245 station_addr[i] = inb(ioaddr + EL1_SAPROM);
246 }
247 /*
248 * Check the first three octets of the S.A. for 3Com's prefix, or
249 * for the Sager NP943 prefix.
250 */
251
252 if (station_addr[0] == 0x02 && station_addr[1] == 0x60
Alan Coxa35f5de2007-11-19 15:02:32 +0000253 && station_addr[2] == 0x8c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 mname = "3c501";
Alan Coxa35f5de2007-11-19 15:02:32 +0000255 else if (station_addr[0] == 0x00 && station_addr[1] == 0x80
256 && station_addr[2] == 0xC8)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 mname = "NP943";
Alan Coxa35f5de2007-11-19 15:02:32 +0000258 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 release_region(ioaddr, EL1_IO_EXTENT);
260 return -ENODEV;
261 }
262
263 /*
Alan Coxa35f5de2007-11-19 15:02:32 +0000264 * We auto-IRQ by shutting off the interrupt line and letting it
265 * float high.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 */
267
268 dev->irq = irq;
269
Alan Coxa35f5de2007-11-19 15:02:32 +0000270 if (dev->irq < 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 unsigned long irq_mask;
272
273 irq_mask = probe_irq_on();
274 inb(RX_STATUS); /* Clear pending interrupts. */
275 inb(TX_STATUS);
276 outb(AX_LOOP + 1, AX_CMD);
277
278 outb(0x00, AX_CMD);
279
280 mdelay(20);
281 autoirq = probe_irq_off(irq_mask);
282
Alan Coxa35f5de2007-11-19 15:02:32 +0000283 if (autoirq == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 printk(KERN_WARNING "%s probe at %#x failed to detect IRQ line.\n",
285 mname, ioaddr);
286 release_region(ioaddr, EL1_IO_EXTENT);
287 return -EAGAIN;
288 }
289 }
290
291 outb(AX_RESET+AX_LOOP, AX_CMD); /* Loopback mode. */
292 dev->base_addr = ioaddr;
293 memcpy(dev->dev_addr, station_addr, ETH_ALEN);
294
295 if (mem_start & 0xf)
296 el_debug = mem_start & 0x7;
297 if (autoirq)
298 dev->irq = autoirq;
299
Alan Coxa35f5de2007-11-19 15:02:32 +0000300 printk(KERN_INFO "%s: %s EtherLink at %#lx, using %sIRQ %d.\n",
301 dev->name, mname, dev->base_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 autoirq ? "auto":"assigned ", dev->irq);
303
304#ifdef CONFIG_IP_MULTICAST
305 printk(KERN_WARNING "WARNING: Use of the 3c501 in a multicast kernel is NOT recommended.\n");
306#endif
307
308 if (el_debug)
309 printk(KERN_DEBUG "%s", version);
310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 lp = netdev_priv(dev);
Wang Chen454d7c92008-11-12 23:37:49 -0800312 memset(lp, 0, sizeof(struct net_local));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 spin_lock_init(&lp->lock);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 /*
316 * The EL1-specific entries in the device structure.
317 */
318
Stephen Hemminger878f6482009-01-09 13:01:11 +0000319 dev->netdev_ops = &el_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 dev->watchdog_timeo = HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 dev->ethtool_ops = &netdev_ethtool_ops;
322 return 0;
323}
324
325/**
326 * el1_open:
327 * @dev: device that is being opened
328 *
329 * When an ifconfig is issued which changes the device flags to include
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400330 * IFF_UP this function is called. It is only called when the change
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 * occurs, not when the interface remains up. #el1_close will be called
332 * when it goes down.
333 *
334 * Returns 0 for a successful open, or -EAGAIN if someone has run off
335 * with our interrupt line.
336 */
337
338static int el_open(struct net_device *dev)
339{
340 int retval;
341 int ioaddr = dev->base_addr;
342 struct net_local *lp = netdev_priv(dev);
343 unsigned long flags;
344
345 if (el_debug > 2)
346 printk(KERN_DEBUG "%s: Doing el_open()...", dev->name);
347
Alan Coxa35f5de2007-11-19 15:02:32 +0000348 retval = request_irq(dev->irq, &el_interrupt, 0, dev->name, dev);
349 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 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 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371static void el_timeout(struct net_device *dev)
372{
373 struct net_local *lp = netdev_priv(dev);
374 int ioaddr = dev->base_addr;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 if (el_debug)
Alan Coxa35f5de2007-11-19 15:02:32 +0000377 printk(KERN_DEBUG "%s: transmit timed out, txsr %#2x axsr=%02x rxsr=%02x.\n",
378 dev->name, inb(TX_STATUS),
379 inb(AX_STATUS), inb(RX_STATUS));
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700380 dev->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 outb(TX_NORM, TX_CMD);
382 outb(RX_NORM, RX_CMD);
383 outb(AX_OFF, AX_CMD); /* Just trigger a false interrupt. */
384 outb(AX_RX, AX_CMD); /* Aux control, irq and receive enabled */
385 lp->txing = 0; /* Ripped back in to RX */
386 netif_wake_queue(dev);
387}
388
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390/**
391 * el_start_xmit:
392 * @skb: The packet that is queued to be sent
393 * @dev: The 3c501 card we want to throw it down
394 *
395 * Attempt to send a packet to a 3c501 card. There are some interesting
396 * catches here because the 3c501 is an extremely old and therefore
397 * stupid piece of technology.
398 *
399 * If we are handling an interrupt on the other CPU we cannot load a packet
400 * as we may still be attempting to retrieve the last RX packet buffer.
401 *
402 * When a transmit times out we dump the card into control mode and just
403 * start again. It happens enough that it isnt worth logging.
404 *
405 * We avoid holding the spin locks when doing the packet load to the board.
406 * The device is very slow, and its DMA mode is even slower. If we held the
407 * lock while loading 1500 bytes onto the controller we would drop a lot of
408 * serial port characters. This requires we do extra locking, but we have
409 * no real choice.
410 */
411
412static int el_start_xmit(struct sk_buff *skb, struct net_device *dev)
413{
414 struct net_local *lp = netdev_priv(dev);
415 int ioaddr = dev->base_addr;
416 unsigned long flags;
417
418 /*
419 * Avoid incoming interrupts between us flipping txing and flipping
420 * mode as the driver assumes txing is a faithful indicator of card
421 * state
422 */
423
424 spin_lock_irqsave(&lp->lock, flags);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 /*
427 * Avoid timer-based retransmission conflicts.
428 */
429
430 netif_stop_queue(dev);
431
Alan Coxa35f5de2007-11-19 15:02:32 +0000432 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 int len = skb->len;
434 int pad = 0;
435 int gp_start;
436 unsigned char *buf = skb->data;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 if (len < ETH_ZLEN)
439 pad = ETH_ZLEN - len;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400440
Alan Coxa35f5de2007-11-19 15:02:32 +0000441 gp_start = 0x800 - (len + pad);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 lp->tx_pkt_start = gp_start;
Alan Coxa35f5de2007-11-19 15:02:32 +0000444 lp->collisions = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700446 dev->stats.tx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
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 /*
Alan Coxa35f5de2007-11-19 15:02:32 +0000461 * Turn interrupts back on while we spend a pleasant
462 * afternoon loading bytes into the board
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 */
464
465 spin_unlock_irqrestore(&lp->lock, flags);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400466
Alan Coxa35f5de2007-11-19 15:02:32 +0000467 /* Set rx packet area to 0. */
468 outw(0x00, RX_BUF_CLR);
469 /* aim - packet will be loaded into buffer start */
470 outw(gp_start, GP_LOW);
471 /* load buffer (usual thing each byte increments the pointer) */
472 outsb(DATAPORT, buf, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 if (pad) {
Alan Coxa35f5de2007-11-19 15:02:32 +0000474 while (pad--) /* Zero fill buffer tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 outb(0, DATAPORT);
476 }
Alan Coxa35f5de2007-11-19 15:02:32 +0000477 /* the board reuses the same register */
478 outw(gp_start, GP_LOW);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400479
Alan Coxa35f5de2007-11-19 15:02:32 +0000480 if (lp->loading != 2) {
481 /* fire ... Trigger xmit. */
482 outb(AX_XMIT, AX_CMD);
483 lp->loading = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 dev->trans_start = jiffies;
485 if (el_debug > 2)
486 printk(KERN_DEBUG " queued xmit.\n");
Alan Coxa35f5de2007-11-19 15:02:32 +0000487 dev_kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 return 0;
489 }
490 /* A receive upset our load, despite our best efforts */
Alan Coxa35f5de2007-11-19 15:02:32 +0000491 if (el_debug > 2)
492 printk(KERN_DEBUG "%s: burped during tx load.\n",
493 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 spin_lock_irqsave(&lp->lock, flags);
Alan Coxad390d22008-03-10 21:57:20 +0000495 } while (1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496}
497
498/**
499 * el_interrupt:
500 * @irq: Interrupt number
501 * @dev_id: The 3c501 that burped
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 *
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400503 * Handle the ether interface interrupts. The 3c501 needs a lot more
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 * hand holding than most cards. In particular we get a transmit interrupt
505 * with a collision error because the board firmware isnt capable of rewinding
506 * its own transmit buffer pointers. It can however count to 16 for us.
507 *
508 * On the receive side the card is also very dumb. It has no buffering to
509 * speak of. We simply pull the packet out of its PIO buffer (which is slow)
510 * and queue it for the kernel. Then we reset the card for the next packet.
511 *
Andreas Mohrd6e05ed2006-06-26 18:35:02 +0200512 * We sometimes get surprise interrupts late both because the SMP IRQ delivery
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 * is message passing and because the card sometimes seems to deliver late. I
514 * think if it is part way through a receive and the mode is changed it carries
515 * on receiving and sends us an interrupt. We have to band aid all these cases
Andreas Mohrd6e05ed2006-06-26 18:35:02 +0200516 * to get a sensible 150kBytes/second performance. Even then you want a small
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 * TCP window.
518 */
519
David Howells7d12e782006-10-05 14:55:46 +0100520static irqreturn_t el_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521{
522 struct net_device *dev = dev_id;
523 struct net_local *lp;
524 int ioaddr;
525 int axsr; /* Aux. status reg. */
526
527 ioaddr = dev->base_addr;
528 lp = netdev_priv(dev);
529
530 spin_lock(&lp->lock);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 /*
533 * What happened ?
534 */
535
536 axsr = inb(AX_STATUS);
537
538 /*
539 * Log it
540 */
541
542 if (el_debug > 3)
Alan Coxa35f5de2007-11-19 15:02:32 +0000543 printk(KERN_DEBUG "%s: el_interrupt() aux=%#02x",
544 dev->name, axsr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Alan Coxa35f5de2007-11-19 15:02:32 +0000546 if (lp->loading == 1 && !lp->txing)
547 printk(KERN_WARNING "%s: Inconsistent state loading while not in tx\n",
548 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Alan Coxa35f5de2007-11-19 15:02:32 +0000550 if (lp->txing) {
551 /*
552 * Board in transmit mode. May be loading. If we are
553 * loading we shouldn't have got this.
554 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 int txsr = inb(TX_STATUS);
556
Alan Coxa35f5de2007-11-19 15:02:32 +0000557 if (lp->loading == 1) {
558 if (el_debug > 2) {
559 printk(KERN_DEBUG "%s: Interrupt while loading [",
560 dev->name);
561 printk(" txsr=%02x gp=%04x rp=%04x]\n",
562 txsr, inw(GP_LOW), inw(RX_LOW));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 }
Alan Coxa35f5de2007-11-19 15:02:32 +0000564 /* Force a reload */
565 lp->loading = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 spin_unlock(&lp->lock);
567 goto out;
568 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 if (el_debug > 6)
Alan Coxa35f5de2007-11-19 15:02:32 +0000570 printk(KERN_DEBUG " txsr=%02x gp=%04x rp=%04x",
571 txsr, inw(GP_LOW), inw(RX_LOW));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Alan Coxa35f5de2007-11-19 15:02:32 +0000573 if ((axsr & 0x80) && (txsr & TX_READY) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 /*
Alan Coxa35f5de2007-11-19 15:02:32 +0000575 * FIXME: is there a logic to whether to keep
576 * on trying or reset immediately ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 */
Alan Coxa35f5de2007-11-19 15:02:32 +0000578 if (el_debug > 1)
579 printk(KERN_DEBUG "%s: Unusual interrupt during Tx, txsr=%02x axsr=%02x gp=%03x rp=%03x.\n",
580 dev->name, txsr, axsr,
581 inw(ioaddr + EL1_DATAPTR),
582 inw(ioaddr + EL1_RXPTR));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 lp->txing = 0;
584 netif_wake_queue(dev);
Alan Coxa35f5de2007-11-19 15:02:32 +0000585 } else if (txsr & TX_16COLLISIONS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 /*
587 * Timed out
588 */
589 if (el_debug)
Alan Coxa35f5de2007-11-19 15:02:32 +0000590 printk(KERN_DEBUG "%s: Transmit failed 16 times, Ethernet jammed?\n", dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 outb(AX_SYS, AX_CMD);
592 lp->txing = 0;
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700593 dev->stats.tx_aborted_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 netif_wake_queue(dev);
Alan Coxa35f5de2007-11-19 15:02:32 +0000595 } else if (txsr & TX_COLLISION) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 /*
597 * Retrigger xmit.
598 */
599
600 if (el_debug > 6)
601 printk(KERN_DEBUG " retransmitting after a collision.\n");
602 /*
Alan Coxa35f5de2007-11-19 15:02:32 +0000603 * Poor little chip can't reset its own start
604 * pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 */
606
607 outb(AX_SYS, AX_CMD);
608 outw(lp->tx_pkt_start, GP_LOW);
609 outb(AX_XMIT, AX_CMD);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700610 dev->stats.collisions++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 spin_unlock(&lp->lock);
612 goto out;
Alan Coxa35f5de2007-11-19 15:02:32 +0000613 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 /*
615 * It worked.. we will now fall through and receive
616 */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700617 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 if (el_debug > 6)
619 printk(KERN_DEBUG " Tx succeeded %s\n",
Alan Coxad390d22008-03-10 21:57:20 +0000620 (txsr & TX_RDY) ? "." :
621 "but tx is busy!");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 /*
623 * This is safe the interrupt is atomic WRT itself.
624 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 lp->txing = 0;
Alan Coxa35f5de2007-11-19 15:02:32 +0000626 /* In case more to transmit */
627 netif_wake_queue(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 }
Alan Coxa35f5de2007-11-19 15:02:32 +0000629 } else {
630 /*
631 * In receive mode.
632 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 int rxsr = inb(RX_STATUS);
635 if (el_debug > 5)
Alan Coxa35f5de2007-11-19 15:02:32 +0000636 printk(KERN_DEBUG " rxsr=%02x txsr=%02x rp=%04x", rxsr, inb(TX_STATUS), inw(RX_LOW));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 /*
638 * Just reading rx_status fixes most errors.
639 */
640 if (rxsr & RX_MISSED)
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700641 dev->stats.rx_missed_errors++;
Alan Coxa35f5de2007-11-19 15:02:32 +0000642 else if (rxsr & RX_RUNT) {
643 /* Handled to avoid board lock-up. */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700644 dev->stats.rx_length_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 if (el_debug > 5)
646 printk(KERN_DEBUG " runt.\n");
Alan Coxa35f5de2007-11-19 15:02:32 +0000647 } else if (rxsr & RX_GOOD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 /*
649 * Receive worked.
650 */
651 el_receive(dev);
Alan Coxa35f5de2007-11-19 15:02:32 +0000652 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 /*
654 * Nothing? Something is broken!
655 */
656 if (el_debug > 2)
657 printk(KERN_DEBUG "%s: No packet seen, rxsr=%02x **resetting 3c501***\n",
658 dev->name, rxsr);
659 el_reset(dev);
660 }
661 if (el_debug > 3)
662 printk(KERN_DEBUG ".\n");
663 }
664
665 /*
666 * Move into receive mode
667 */
668
669 outb(AX_RX, AX_CMD);
670 outw(0x00, RX_BUF_CLR);
671 inb(RX_STATUS); /* Be certain that interrupts are cleared. */
672 inb(TX_STATUS);
673 spin_unlock(&lp->lock);
674out:
675 return IRQ_HANDLED;
676}
677
678
679/**
680 * el_receive:
681 * @dev: Device to pull the packets from
682 *
683 * We have a good packet. Well, not really "good", just mostly not broken.
684 * We must check everything to see if it is good. In particular we occasionally
685 * get wild packet sizes from the card. If the packet seems sane we PIO it
686 * off the card and queue it for the protocol layers.
687 */
688
689static void el_receive(struct net_device *dev)
690{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 int ioaddr = dev->base_addr;
692 int pkt_len;
693 struct sk_buff *skb;
694
695 pkt_len = inw(RX_LOW);
696
697 if (el_debug > 4)
698 printk(KERN_DEBUG " el_receive %d.\n", pkt_len);
699
Alan Coxa35f5de2007-11-19 15:02:32 +0000700 if (pkt_len < 60 || pkt_len > 1536) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (el_debug)
Alan Coxad390d22008-03-10 21:57:20 +0000702 printk(KERN_DEBUG "%s: bogus packet, length=%d\n",
703 dev->name, pkt_len);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700704 dev->stats.rx_over_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 return;
706 }
707
708 /*
709 * Command mode so we can empty the buffer
710 */
711
712 outb(AX_SYS, AX_CMD);
713 skb = dev_alloc_skb(pkt_len+2);
714
715 /*
716 * Start of frame
717 */
718
719 outw(0x00, GP_LOW);
Alan Coxa35f5de2007-11-19 15:02:32 +0000720 if (skb == NULL) {
Alan Coxad390d22008-03-10 21:57:20 +0000721 printk(KERN_INFO "%s: Memory squeeze, dropping packet.\n",
722 dev->name);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700723 dev->stats.rx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 return;
Alan Coxa35f5de2007-11-19 15:02:32 +0000725 } else {
726 skb_reserve(skb, 2); /* Force 16 byte alignment */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 /*
728 * The read increments through the bytes. The interrupt
729 * handler will fix the pointer when it returns to
730 * receive mode.
731 */
Alan Coxa35f5de2007-11-19 15:02:32 +0000732 insb(DATAPORT, skb_put(skb, pkt_len), pkt_len);
733 skb->protocol = eth_type_trans(skb, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 netif_rx(skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700735 dev->stats.rx_packets++;
Alan Coxa35f5de2007-11-19 15:02:32 +0000736 dev->stats.rx_bytes += pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 }
738 return;
739}
740
741/**
742 * el_reset: Reset a 3c501 card
743 * @dev: The 3c501 card about to get zapped
744 *
745 * Even resetting a 3c501 isnt simple. When you activate reset it loses all
746 * its configuration. You must hold the lock when doing this. The function
747 * cannot take the lock itself as it is callable from the irq handler.
748 */
749
750static void el_reset(struct net_device *dev)
751{
752 struct net_local *lp = netdev_priv(dev);
753 int ioaddr = dev->base_addr;
754
Alan Coxa35f5de2007-11-19 15:02:32 +0000755 if (el_debug > 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 printk(KERN_INFO "3c501 reset...");
757 outb(AX_RESET, AX_CMD); /* Reset the chip */
Alan Coxad390d22008-03-10 21:57:20 +0000758 /* Aux control, irq and loopback enabled */
759 outb(AX_LOOP, AX_CMD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 {
761 int i;
762 for (i = 0; i < 6; i++) /* Set the station address. */
763 outb(dev->dev_addr[i], ioaddr + i);
764 }
765
766 outw(0, RX_BUF_CLR); /* Set rx packet area to 0. */
767 outb(TX_NORM, TX_CMD); /* tx irq on done, collision */
768 outb(RX_NORM, RX_CMD); /* Set Rx commands. */
769 inb(RX_STATUS); /* Clear status. */
770 inb(TX_STATUS);
771 lp->txing = 0;
772}
773
774/**
775 * el1_close:
776 * @dev: 3c501 card to shut down
777 *
778 * Close a 3c501 card. The IFF_UP flag has been cleared by the user via
779 * the SIOCSIFFLAGS ioctl. We stop any further transmissions being queued,
780 * and then disable the interrupts. Finally we reset the chip. The effects
781 * of the rest will be cleaned up by #el1_open. Always returns 0 indicating
782 * a success.
783 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400784
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785static int el1_close(struct net_device *dev)
786{
787 int ioaddr = dev->base_addr;
788
789 if (el_debug > 2)
Alan Coxa35f5de2007-11-19 15:02:32 +0000790 printk(KERN_INFO "%s: Shutting down Ethernet card at %#x.\n",
791 dev->name, ioaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
793 netif_stop_queue(dev);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 /*
796 * Free and disable the IRQ.
797 */
798
799 free_irq(dev->irq, dev);
800 outb(AX_RESET, AX_CMD); /* Reset the chip */
801
802 return 0;
803}
804
805/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 * set_multicast_list:
807 * @dev: The device to adjust
808 *
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400809 * Set or clear the multicast filter for this adaptor to use the best-effort
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 * filtering supported. The 3c501 supports only three modes of filtering.
811 * It always receives broadcasts and packets for itself. You can choose to
812 * optionally receive all packets, or all multicast packets on top of this.
813 */
814
815static void set_multicast_list(struct net_device *dev)
816{
817 int ioaddr = dev->base_addr;
818
Alan Coxa35f5de2007-11-19 15:02:32 +0000819 if (dev->flags & IFF_PROMISC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 outb(RX_PROM, RX_CMD);
821 inb(RX_STATUS);
Alan Coxa35f5de2007-11-19 15:02:32 +0000822 } else if (dev->mc_list || dev->flags & IFF_ALLMULTI) {
823 /* Multicast or all multicast is the same */
824 outb(RX_MULT, RX_CMD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 inb(RX_STATUS); /* Clear status. */
Alan Coxa35f5de2007-11-19 15:02:32 +0000826 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 outb(RX_NORM, RX_CMD);
828 inb(RX_STATUS);
829 }
830}
831
832
833static void netdev_get_drvinfo(struct net_device *dev,
834 struct ethtool_drvinfo *info)
835{
836 strcpy(info->driver, DRV_NAME);
837 strcpy(info->version, DRV_VERSION);
838 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
839}
840
841static u32 netdev_get_msglevel(struct net_device *dev)
842{
843 return debug;
844}
845
846static void netdev_set_msglevel(struct net_device *dev, u32 level)
847{
848 debug = level;
849}
850
Jeff Garzik7282d492006-09-13 14:30:00 -0400851static const struct ethtool_ops netdev_ethtool_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 .get_drvinfo = netdev_get_drvinfo,
853 .get_msglevel = netdev_get_msglevel,
854 .set_msglevel = netdev_set_msglevel,
855};
856
857#ifdef MODULE
858
859static struct net_device *dev_3c501;
860
861module_param(io, int, 0);
862module_param(irq, int, 0);
863MODULE_PARM_DESC(io, "EtherLink I/O base address");
864MODULE_PARM_DESC(irq, "EtherLink IRQ number");
865
866/**
867 * init_module:
868 *
869 * When the driver is loaded as a module this function is called. We fake up
870 * a device structure with the base I/O and interrupt set as if it were being
871 * called from Space.c. This minimises the extra code that would otherwise
872 * be required.
873 *
874 * Returns 0 for success or -EIO if a card is not found. Returning an error
875 * here also causes the module to be unloaded
876 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400877
Randy Dunlap96e672c2006-06-10 13:33:48 -0700878int __init init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879{
880 dev_3c501 = el1_probe(-1);
881 if (IS_ERR(dev_3c501))
882 return PTR_ERR(dev_3c501);
883 return 0;
884}
885
886/**
887 * cleanup_module:
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400888 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 * The module is being unloaded. We unhook our network device from the system
890 * and then free up the resources we took when the card was found.
891 */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400892
Al Viroafc8eb42006-06-14 18:50:53 -0400893void __exit cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894{
895 struct net_device *dev = dev_3c501;
896 unregister_netdev(dev);
897 release_region(dev->base_addr, EL1_IO_EXTENT);
898 free_netdev(dev);
899}
900
901#endif /* MODULE */
902
903MODULE_AUTHOR("Donald Becker, Alan Cox");
904MODULE_DESCRIPTION("Support for the ancient 3Com 3c501 ethernet card");
905MODULE_LICENSE("GPL");
906