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1da177e4 LT |
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. | |
113aa838 | 20 | Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
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. | |
113aa838 | 32 | 19950402 Alan Cox <alan@lxorguk.ukuu.org.uk> |
6aa20a22 JG |
33 | |
34 | Cleaned up for 2.3.x because we broke SMP now. | |
113aa838 | 35 | 20000208 Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
36 | |
37 | Check up pass for 2.5. Nothing significant changed | |
113aa838 | 38 | 20021009 Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 | 39 | |
6aa20a22 | 40 | Fixed zero fill corner case |
113aa838 | 41 | 20030104 Alan Cox <alan@lxorguk.ukuu.org.uk> |
6aa20a22 JG |
42 | |
43 | ||
1da177e4 LT |
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 | |
6aa20a22 | 61 | * of historical interest anyway. |
1da177e4 LT |
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 | |
6aa20a22 | 83 | * |
1da177e4 LT |
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[] = | |
113aa838 | 107 | DRV_NAME ".c: " DRV_VERSION " Alan Cox (alan@lxorguk.ukuu.org.uk).\n"; |
1da177e4 LT |
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> | |
1da177e4 LT |
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 | ||
a35f5de7 AC |
142 | static int io = 0x280; |
143 | static int irq = 5; | |
1da177e4 LT |
144 | static int mem_start; |
145 | ||
146 | /** | |
147 | * el1_probe: - probe for a 3c501 | |
6aa20a22 | 148 | * @dev: The device structure passed in to probe. |
1da177e4 LT |
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 | */ | |
6aa20a22 | 158 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
878f6485 SH |
200 | static 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 | ||
1da177e4 | 211 | /** |
6aa20a22 | 212 | * el1_probe1: |
1da177e4 LT |
213 | * @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 | ||
224 | static 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 | ||
a35f5de7 | 243 | for (i = 0; i < 6; i++) { |
1da177e4 LT |
244 | 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 | |
a35f5de7 | 253 | && station_addr[2] == 0x8c) |
1da177e4 | 254 | mname = "3c501"; |
a35f5de7 AC |
255 | else if (station_addr[0] == 0x00 && station_addr[1] == 0x80 |
256 | && station_addr[2] == 0xC8) | |
1da177e4 | 257 | mname = "NP943"; |
a35f5de7 | 258 | else { |
1da177e4 LT |
259 | release_region(ioaddr, EL1_IO_EXTENT); |
260 | return -ENODEV; | |
261 | } | |
262 | ||
263 | /* | |
a35f5de7 AC |
264 | * We auto-IRQ by shutting off the interrupt line and letting it |
265 | * float high. | |
1da177e4 LT |
266 | */ |
267 | ||
268 | dev->irq = irq; | |
269 | ||
a35f5de7 | 270 | if (dev->irq < 2) { |
1da177e4 LT |
271 | 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 | ||
a35f5de7 | 283 | if (autoirq == 0) { |
646cdb32 | 284 | pr_warning("%s probe at %#x failed to detect IRQ line.\n", |
1da177e4 LT |
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 | ||
646cdb32 | 300 | pr_info("%s: %s EtherLink at %#lx, using %sIRQ %d.\n", |
a35f5de7 | 301 | dev->name, mname, dev->base_addr, |
1da177e4 LT |
302 | autoirq ? "auto":"assigned ", dev->irq); |
303 | ||
304 | #ifdef CONFIG_IP_MULTICAST | |
646cdb32 | 305 | pr_warning("WARNING: Use of the 3c501 in a multicast kernel is NOT recommended.\n"); |
1da177e4 LT |
306 | #endif |
307 | ||
308 | if (el_debug) | |
646cdb32 | 309 | pr_debug("%s", version); |
1da177e4 | 310 | |
1da177e4 | 311 | lp = netdev_priv(dev); |
454d7c9b | 312 | memset(lp, 0, sizeof(struct net_local)); |
1da177e4 | 313 | spin_lock_init(&lp->lock); |
6aa20a22 | 314 | |
1da177e4 LT |
315 | /* |
316 | * The EL1-specific entries in the device structure. | |
317 | */ | |
318 | ||
878f6485 | 319 | dev->netdev_ops = &el_netdev_ops; |
1da177e4 | 320 | dev->watchdog_timeo = HZ; |
1da177e4 LT |
321 | 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 | |
6aa20a22 | 330 | * IFF_UP this function is called. It is only called when the change |
1da177e4 LT |
331 | * 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 | ||
338 | static 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) | |
646cdb32 | 346 | pr_debug("%s: Doing el_open()...\n", dev->name); |
1da177e4 | 347 | |
a0607fd3 | 348 | retval = request_irq(dev->irq, el_interrupt, 0, dev->name, dev); |
a35f5de7 | 349 | if (retval) |
1da177e4 LT |
350 | return retval; |
351 | ||
352 | spin_lock_irqsave(&lp->lock, flags); | |
353 | el_reset(dev); | |
354 | spin_unlock_irqrestore(&lp->lock, flags); | |
355 | ||
356 | lp->txing = 0; /* Board in RX mode */ | |
357 | outb(AX_RX, AX_CMD); /* Aux control, irq and receive enabled */ | |
358 | netif_start_queue(dev); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | /** | |
363 | * el_timeout: | |
364 | * @dev: The 3c501 card that has timed out | |
365 | * | |
366 | * Attempt to restart the board. This is basically a mixture of extreme | |
367 | * violence and prayer | |
368 | * | |
369 | */ | |
6aa20a22 | 370 | |
1da177e4 LT |
371 | static void el_timeout(struct net_device *dev) |
372 | { | |
373 | struct net_local *lp = netdev_priv(dev); | |
374 | int ioaddr = dev->base_addr; | |
6aa20a22 | 375 | |
1da177e4 | 376 | if (el_debug) |
646cdb32 | 377 | pr_debug("%s: transmit timed out, txsr %#2x axsr=%02x rxsr=%02x.\n", |
a35f5de7 AC |
378 | dev->name, inb(TX_STATUS), |
379 | inb(AX_STATUS), inb(RX_STATUS)); | |
09f75cd7 | 380 | dev->stats.tx_errors++; |
1da177e4 LT |
381 | 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 | ||
6aa20a22 | 389 | |
1da177e4 LT |
390 | /** |
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 | ||
27a1de95 | 412 | static netdev_tx_t el_start_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
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); | |
6aa20a22 | 425 | |
1da177e4 LT |
426 | /* |
427 | * Avoid timer-based retransmission conflicts. | |
428 | */ | |
429 | ||
430 | netif_stop_queue(dev); | |
431 | ||
a35f5de7 | 432 | do { |
1da177e4 LT |
433 | int len = skb->len; |
434 | int pad = 0; | |
435 | int gp_start; | |
436 | unsigned char *buf = skb->data; | |
6aa20a22 | 437 | |
1da177e4 LT |
438 | if (len < ETH_ZLEN) |
439 | pad = ETH_ZLEN - len; | |
6aa20a22 | 440 | |
a35f5de7 | 441 | gp_start = 0x800 - (len + pad); |
1da177e4 LT |
442 | |
443 | lp->tx_pkt_start = gp_start; | |
a35f5de7 | 444 | lp->collisions = 0; |
1da177e4 | 445 | |
09f75cd7 | 446 | dev->stats.tx_bytes += skb->len; |
1da177e4 LT |
447 | |
448 | /* | |
449 | * Command mode with status cleared should [in theory] | |
450 | * mean no more interrupts can be pending on the card. | |
451 | */ | |
452 | ||
453 | outb_p(AX_SYS, AX_CMD); | |
454 | inb_p(RX_STATUS); | |
455 | inb_p(TX_STATUS); | |
456 | ||
457 | lp->loading = 1; | |
458 | lp->txing = 1; | |
459 | ||
460 | /* | |
a35f5de7 AC |
461 | * Turn interrupts back on while we spend a pleasant |
462 | * afternoon loading bytes into the board | |
1da177e4 LT |
463 | */ |
464 | ||
465 | spin_unlock_irqrestore(&lp->lock, flags); | |
6aa20a22 | 466 | |
a35f5de7 AC |
467 | /* 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); | |
1da177e4 | 473 | if (pad) { |
a35f5de7 | 474 | while (pad--) /* Zero fill buffer tail */ |
1da177e4 LT |
475 | outb(0, DATAPORT); |
476 | } | |
a35f5de7 AC |
477 | /* the board reuses the same register */ |
478 | outw(gp_start, GP_LOW); | |
6aa20a22 | 479 | |
a35f5de7 AC |
480 | if (lp->loading != 2) { |
481 | /* fire ... Trigger xmit. */ | |
482 | outb(AX_XMIT, AX_CMD); | |
483 | lp->loading = 0; | |
1da177e4 LT |
484 | dev->trans_start = jiffies; |
485 | if (el_debug > 2) | |
646cdb32 | 486 | pr_debug(" queued xmit.\n"); |
a35f5de7 | 487 | dev_kfree_skb(skb); |
ec634fe3 | 488 | return NETDEV_TX_OK; |
1da177e4 LT |
489 | } |
490 | /* A receive upset our load, despite our best efforts */ | |
a35f5de7 | 491 | if (el_debug > 2) |
646cdb32 | 492 | pr_debug("%s: burped during tx load.\n", dev->name); |
1da177e4 | 493 | spin_lock_irqsave(&lp->lock, flags); |
ad390d2d | 494 | } while (1); |
1da177e4 LT |
495 | } |
496 | ||
497 | /** | |
498 | * el_interrupt: | |
499 | * @irq: Interrupt number | |
500 | * @dev_id: The 3c501 that burped | |
1da177e4 | 501 | * |
6aa20a22 | 502 | * Handle the ether interface interrupts. The 3c501 needs a lot more |
1da177e4 LT |
503 | * hand holding than most cards. In particular we get a transmit interrupt |
504 | * with a collision error because the board firmware isnt capable of rewinding | |
505 | * its own transmit buffer pointers. It can however count to 16 for us. | |
506 | * | |
507 | * On the receive side the card is also very dumb. It has no buffering to | |
508 | * speak of. We simply pull the packet out of its PIO buffer (which is slow) | |
509 | * and queue it for the kernel. Then we reset the card for the next packet. | |
510 | * | |
d6e05edc | 511 | * We sometimes get surprise interrupts late both because the SMP IRQ delivery |
1da177e4 LT |
512 | * is message passing and because the card sometimes seems to deliver late. I |
513 | * think if it is part way through a receive and the mode is changed it carries | |
514 | * on receiving and sends us an interrupt. We have to band aid all these cases | |
d6e05edc | 515 | * to get a sensible 150kBytes/second performance. Even then you want a small |
1da177e4 LT |
516 | * TCP window. |
517 | */ | |
518 | ||
7d12e780 | 519 | static irqreturn_t el_interrupt(int irq, void *dev_id) |
1da177e4 LT |
520 | { |
521 | struct net_device *dev = dev_id; | |
522 | struct net_local *lp; | |
523 | int ioaddr; | |
524 | int axsr; /* Aux. status reg. */ | |
525 | ||
526 | ioaddr = dev->base_addr; | |
527 | lp = netdev_priv(dev); | |
528 | ||
529 | spin_lock(&lp->lock); | |
6aa20a22 | 530 | |
1da177e4 LT |
531 | /* |
532 | * What happened ? | |
533 | */ | |
534 | ||
535 | axsr = inb(AX_STATUS); | |
536 | ||
537 | /* | |
538 | * Log it | |
539 | */ | |
540 | ||
541 | if (el_debug > 3) | |
646cdb32 | 542 | pr_debug("%s: el_interrupt() aux=%#02x\n", dev->name, axsr); |
1da177e4 | 543 | |
a35f5de7 | 544 | if (lp->loading == 1 && !lp->txing) |
646cdb32 | 545 | pr_warning("%s: Inconsistent state loading while not in tx\n", |
a35f5de7 | 546 | dev->name); |
1da177e4 | 547 | |
a35f5de7 AC |
548 | if (lp->txing) { |
549 | /* | |
550 | * Board in transmit mode. May be loading. If we are | |
551 | * loading we shouldn't have got this. | |
552 | */ | |
1da177e4 LT |
553 | int txsr = inb(TX_STATUS); |
554 | ||
a35f5de7 | 555 | if (lp->loading == 1) { |
646cdb32 AB |
556 | if (el_debug > 2) |
557 | pr_debug("%s: Interrupt while loading [txsr=%02x gp=%04x rp=%04x]\n", | |
558 | dev->name, txsr, inw(GP_LOW), inw(RX_LOW)); | |
559 | ||
a35f5de7 AC |
560 | /* Force a reload */ |
561 | lp->loading = 2; | |
1da177e4 LT |
562 | spin_unlock(&lp->lock); |
563 | goto out; | |
564 | } | |
1da177e4 | 565 | if (el_debug > 6) |
646cdb32 | 566 | pr_debug("%s: txsr=%02x gp=%04x rp=%04x\n", dev->name, |
a35f5de7 | 567 | txsr, inw(GP_LOW), inw(RX_LOW)); |
1da177e4 | 568 | |
a35f5de7 | 569 | if ((axsr & 0x80) && (txsr & TX_READY) == 0) { |
1da177e4 | 570 | /* |
a35f5de7 AC |
571 | * FIXME: is there a logic to whether to keep |
572 | * on trying or reset immediately ? | |
1da177e4 | 573 | */ |
a35f5de7 | 574 | if (el_debug > 1) |
646cdb32 | 575 | pr_debug("%s: Unusual interrupt during Tx, txsr=%02x axsr=%02x gp=%03x rp=%03x.\n", |
a35f5de7 AC |
576 | dev->name, txsr, axsr, |
577 | inw(ioaddr + EL1_DATAPTR), | |
578 | inw(ioaddr + EL1_RXPTR)); | |
1da177e4 LT |
579 | lp->txing = 0; |
580 | netif_wake_queue(dev); | |
a35f5de7 | 581 | } else if (txsr & TX_16COLLISIONS) { |
1da177e4 LT |
582 | /* |
583 | * Timed out | |
584 | */ | |
585 | if (el_debug) | |
646cdb32 | 586 | pr_debug("%s: Transmit failed 16 times, Ethernet jammed?\n", dev->name); |
1da177e4 LT |
587 | outb(AX_SYS, AX_CMD); |
588 | lp->txing = 0; | |
09f75cd7 | 589 | dev->stats.tx_aborted_errors++; |
1da177e4 | 590 | netif_wake_queue(dev); |
a35f5de7 | 591 | } else if (txsr & TX_COLLISION) { |
1da177e4 LT |
592 | /* |
593 | * Retrigger xmit. | |
594 | */ | |
595 | ||
596 | if (el_debug > 6) | |
646cdb32 | 597 | pr_debug("%s: retransmitting after a collision.\n", dev->name); |
1da177e4 | 598 | /* |
a35f5de7 AC |
599 | * Poor little chip can't reset its own start |
600 | * pointer | |
1da177e4 LT |
601 | */ |
602 | ||
603 | outb(AX_SYS, AX_CMD); | |
604 | outw(lp->tx_pkt_start, GP_LOW); | |
605 | outb(AX_XMIT, AX_CMD); | |
09f75cd7 | 606 | dev->stats.collisions++; |
1da177e4 LT |
607 | spin_unlock(&lp->lock); |
608 | goto out; | |
a35f5de7 | 609 | } else { |
1da177e4 LT |
610 | /* |
611 | * It worked.. we will now fall through and receive | |
612 | */ | |
09f75cd7 | 613 | dev->stats.tx_packets++; |
1da177e4 | 614 | if (el_debug > 6) |
646cdb32 AB |
615 | pr_debug("%s: Tx succeeded %s\n", dev->name, |
616 | (txsr & TX_RDY) ? "." : "but tx is busy!"); | |
1da177e4 LT |
617 | /* |
618 | * This is safe the interrupt is atomic WRT itself. | |
619 | */ | |
1da177e4 | 620 | lp->txing = 0; |
a35f5de7 AC |
621 | /* In case more to transmit */ |
622 | netif_wake_queue(dev); | |
1da177e4 | 623 | } |
a35f5de7 AC |
624 | } else { |
625 | /* | |
626 | * In receive mode. | |
627 | */ | |
1da177e4 LT |
628 | |
629 | int rxsr = inb(RX_STATUS); | |
630 | if (el_debug > 5) | |
646cdb32 AB |
631 | pr_debug("%s: rxsr=%02x txsr=%02x rp=%04x\n", |
632 | dev->name, rxsr, inb(TX_STATUS), inw(RX_LOW)); | |
1da177e4 LT |
633 | /* |
634 | * Just reading rx_status fixes most errors. | |
635 | */ | |
636 | if (rxsr & RX_MISSED) | |
09f75cd7 | 637 | dev->stats.rx_missed_errors++; |
a35f5de7 AC |
638 | else if (rxsr & RX_RUNT) { |
639 | /* Handled to avoid board lock-up. */ | |
09f75cd7 | 640 | dev->stats.rx_length_errors++; |
1da177e4 | 641 | if (el_debug > 5) |
646cdb32 | 642 | pr_debug("%s: runt.\n", dev->name); |
a35f5de7 | 643 | } else if (rxsr & RX_GOOD) { |
1da177e4 LT |
644 | /* |
645 | * Receive worked. | |
646 | */ | |
647 | el_receive(dev); | |
a35f5de7 | 648 | } else { |
1da177e4 LT |
649 | /* |
650 | * Nothing? Something is broken! | |
651 | */ | |
652 | if (el_debug > 2) | |
646cdb32 | 653 | pr_debug("%s: No packet seen, rxsr=%02x **resetting 3c501***\n", |
1da177e4 LT |
654 | dev->name, rxsr); |
655 | el_reset(dev); | |
656 | } | |
1da177e4 LT |
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); | |
668 | out: | |
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 | ||
683 | static void el_receive(struct net_device *dev) | |
684 | { | |
1da177e4 LT |
685 | 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) | |
646cdb32 | 692 | pr_debug(" el_receive %d.\n", pkt_len); |
1da177e4 | 693 | |
a35f5de7 | 694 | if (pkt_len < 60 || pkt_len > 1536) { |
1da177e4 | 695 | if (el_debug) |
646cdb32 | 696 | pr_debug("%s: bogus packet, length=%d\n", |
ad390d2d | 697 | dev->name, pkt_len); |
09f75cd7 | 698 | dev->stats.rx_over_errors++; |
1da177e4 LT |
699 | return; |
700 | } | |
701 | ||
702 | /* | |
703 | * Command mode so we can empty the buffer | |
704 | */ | |
705 | ||
706 | outb(AX_SYS, AX_CMD); | |
707 | skb = dev_alloc_skb(pkt_len+2); | |
708 | ||
709 | /* | |
710 | * Start of frame | |
711 | */ | |
712 | ||
713 | outw(0x00, GP_LOW); | |
a35f5de7 | 714 | if (skb == NULL) { |
646cdb32 | 715 | pr_info("%s: Memory squeeze, dropping packet.\n", dev->name); |
09f75cd7 | 716 | dev->stats.rx_dropped++; |
1da177e4 | 717 | return; |
a35f5de7 AC |
718 | } else { |
719 | skb_reserve(skb, 2); /* Force 16 byte alignment */ | |
1da177e4 LT |
720 | /* |
721 | * The read increments through the bytes. The interrupt | |
722 | * handler will fix the pointer when it returns to | |
723 | * receive mode. | |
724 | */ | |
a35f5de7 AC |
725 | insb(DATAPORT, skb_put(skb, pkt_len), pkt_len); |
726 | skb->protocol = eth_type_trans(skb, dev); | |
1da177e4 | 727 | netif_rx(skb); |
09f75cd7 | 728 | dev->stats.rx_packets++; |
a35f5de7 | 729 | dev->stats.rx_bytes += pkt_len; |
1da177e4 LT |
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 | ||
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 | ||
a35f5de7 | 748 | if (el_debug > 2) |
646cdb32 | 749 | pr_info("3c501 reset...\n"); |
1da177e4 | 750 | outb(AX_RESET, AX_CMD); /* Reset the chip */ |
ad390d2d AC |
751 | /* Aux control, irq and loopback enabled */ |
752 | outb(AX_LOOP, AX_CMD); | |
1da177e4 LT |
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 | */ | |
6aa20a22 | 777 | |
1da177e4 LT |
778 | static int el1_close(struct net_device *dev) |
779 | { | |
780 | int ioaddr = dev->base_addr; | |
781 | ||
782 | if (el_debug > 2) | |
646cdb32 | 783 | pr_info("%s: Shutting down Ethernet card at %#x.\n", |
a35f5de7 | 784 | dev->name, ioaddr); |
1da177e4 LT |
785 | |
786 | netif_stop_queue(dev); | |
6aa20a22 | 787 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
798 | /** |
799 | * set_multicast_list: | |
800 | * @dev: The device to adjust | |
801 | * | |
6aa20a22 | 802 | * Set or clear the multicast filter for this adaptor to use the best-effort |
1da177e4 LT |
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 | ||
808 | static void set_multicast_list(struct net_device *dev) | |
809 | { | |
810 | int ioaddr = dev->base_addr; | |
811 | ||
a35f5de7 | 812 | if (dev->flags & IFF_PROMISC) { |
1da177e4 LT |
813 | outb(RX_PROM, RX_CMD); |
814 | inb(RX_STATUS); | |
a35f5de7 AC |
815 | } else if (dev->mc_list || dev->flags & IFF_ALLMULTI) { |
816 | /* Multicast or all multicast is the same */ | |
817 | outb(RX_MULT, RX_CMD); | |
1da177e4 | 818 | inb(RX_STATUS); /* Clear status. */ |
a35f5de7 | 819 | } else { |
1da177e4 LT |
820 | outb(RX_NORM, RX_CMD); |
821 | inb(RX_STATUS); | |
822 | } | |
823 | } | |
824 | ||
825 | ||
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 | ||
834 | static u32 netdev_get_msglevel(struct net_device *dev) | |
835 | { | |
836 | return debug; | |
837 | } | |
838 | ||
839 | static void netdev_set_msglevel(struct net_device *dev, u32 level) | |
840 | { | |
841 | debug = level; | |
842 | } | |
843 | ||
7282d491 | 844 | static const struct ethtool_ops netdev_ethtool_ops = { |
1da177e4 LT |
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 | */ | |
6aa20a22 | 870 | |
96e672c7 | 871 | int __init init_module(void) |
1da177e4 LT |
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: | |
6aa20a22 | 881 | * |
1da177e4 LT |
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 | */ | |
6aa20a22 | 885 | |
afc8eb46 | 886 | void __exit cleanup_module(void) |
1da177e4 LT |
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 |