1 /* ======================================================================
2  *
3  * A PCMCIA ethernet driver for the 3com 3c589 card.
4  *
5  * Copyright (C) 1999 David A. Hinds -- dahinds@users.sourceforge.net
6  *
7  * 3c589_cs.c 1.162 2001/10/13 00:08:50
8  *
9  * The network driver code is based on Donald Becker's 3c589 code:
10  *
11  * Written 1994 by Donald Becker.
12  * Copyright 1993 United States Government as represented by the
13  * Director, National Security Agency.  This software may be used and
14  * distributed according to the terms of the GNU General Public License,
15  * incorporated herein by reference.
16  * Donald Becker may be reached at becker@scyld.com
17  *
18  * Updated for 2.5.x by Alan Cox <alan@lxorguk.ukuu.org.uk>
19  *
20  * ======================================================================
21  */
22 
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 
25 #define DRV_NAME	"3c589_cs"
26 
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/ptrace.h>
30 #include <linux/slab.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/interrupt.h>
34 #include <linux/in.h>
35 #include <linux/delay.h>
36 #include <linux/ethtool.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/skbuff.h>
40 #include <linux/if_arp.h>
41 #include <linux/ioport.h>
42 #include <linux/bitops.h>
43 #include <linux/jiffies.h>
44 #include <linux/uaccess.h>
45 #include <linux/io.h>
46 
47 #include <pcmcia/cistpl.h>
48 #include <pcmcia/cisreg.h>
49 #include <pcmcia/ciscode.h>
50 #include <pcmcia/ds.h>
51 
52 
53 /* To minimize the size of the driver source I only define operating
54  * constants if they are used several times. You'll need the manual
55  * if you want to understand driver details.
56  */
57 
58 /* Offsets from base I/O address. */
59 #define EL3_DATA	0x00
60 #define EL3_TIMER	0x0a
61 #define EL3_CMD		0x0e
62 #define EL3_STATUS	0x0e
63 
64 #define EEPROM_READ	0x0080
65 #define EEPROM_BUSY	0x8000
66 
67 #define EL3WINDOW(win_num) outw(SelectWindow + (win_num), ioaddr + EL3_CMD)
68 
69 /* The top five bits written to EL3_CMD are a command, the lower
70  * 11 bits are the parameter, if applicable.
71  */
72 
73 enum c509cmd {
74 	TotalReset	= 0<<11,
75 	SelectWindow	= 1<<11,
76 	StartCoax	= 2<<11,
77 	RxDisable	= 3<<11,
78 	RxEnable	= 4<<11,
79 	RxReset		= 5<<11,
80 	RxDiscard	= 8<<11,
81 	TxEnable	= 9<<11,
82 	TxDisable	= 10<<11,
83 	TxReset		= 11<<11,
84 	FakeIntr	= 12<<11,
85 	AckIntr		= 13<<11,
86 	SetIntrEnb	= 14<<11,
87 	SetStatusEnb	= 15<<11,
88 	SetRxFilter	= 16<<11,
89 	SetRxThreshold	= 17<<11,
90 	SetTxThreshold	= 18<<11,
91 	SetTxStart	= 19<<11,
92 	StatsEnable	= 21<<11,
93 	StatsDisable	= 22<<11,
94 	StopCoax	= 23<<11
95 };
96 
97 enum c509status {
98 	IntLatch	= 0x0001,
99 	AdapterFailure	= 0x0002,
100 	TxComplete	= 0x0004,
101 	TxAvailable	= 0x0008,
102 	RxComplete	= 0x0010,
103 	RxEarly		= 0x0020,
104 	IntReq		= 0x0040,
105 	StatsFull	= 0x0080,
106 	CmdBusy		= 0x1000
107 };
108 
109 /* The SetRxFilter command accepts the following classes: */
110 enum RxFilter {
111 	RxStation	= 1,
112 	RxMulticast	= 2,
113 	RxBroadcast	= 4,
114 	RxProm		= 8
115 };
116 
117 /* Register window 1 offsets, the window used in normal operation. */
118 #define TX_FIFO		0x00
119 #define RX_FIFO		0x00
120 #define RX_STATUS	0x08
121 #define TX_STATUS	0x0B
122 #define TX_FREE		0x0C	/* Remaining free bytes in Tx buffer. */
123 
124 #define WN0_IRQ		0x08	/* Window 0: Set IRQ line in bits 12-15. */
125 #define WN4_MEDIA	0x0A	/* Window 4: Various transcvr/media bits. */
126 #define MEDIA_TP	0x00C0	/* Enable link beat and jabber for 10baseT. */
127 #define MEDIA_LED	0x0001	/* Enable link light on 3C589E cards. */
128 
129 /* Time in jiffies before concluding Tx hung */
130 #define TX_TIMEOUT	((400*HZ)/1000)
131 
132 struct el3_private {
133 	struct pcmcia_device	*p_dev;
134 	/* For transceiver monitoring */
135 	struct timer_list	media;
136 	u16			media_status;
137 	u16			fast_poll;
138 	unsigned long		last_irq;
139 	spinlock_t		lock;
140 };
141 
142 static const char *if_names[] = { "auto", "10baseT", "10base2", "AUI" };
143 
144 /*====================================================================*/
145 
146 /* Module parameters */
147 
148 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
149 MODULE_DESCRIPTION("3Com 3c589 series PCMCIA ethernet driver");
150 MODULE_LICENSE("GPL");
151 
152 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0)
153 
154 /* Special hook for setting if_port when module is loaded */
155 INT_MODULE_PARM(if_port, 0);
156 
157 
158 /*====================================================================*/
159 
160 static int tc589_config(struct pcmcia_device *link);
161 static void tc589_release(struct pcmcia_device *link);
162 
163 static u16 read_eeprom(unsigned int ioaddr, int index);
164 static void tc589_reset(struct net_device *dev);
165 static void media_check(struct timer_list *t);
166 static int el3_config(struct net_device *dev, struct ifmap *map);
167 static int el3_open(struct net_device *dev);
168 static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
169 					struct net_device *dev);
170 static irqreturn_t el3_interrupt(int irq, void *dev_id);
171 static void update_stats(struct net_device *dev);
172 static struct net_device_stats *el3_get_stats(struct net_device *dev);
173 static int el3_rx(struct net_device *dev);
174 static int el3_close(struct net_device *dev);
175 static void el3_tx_timeout(struct net_device *dev, unsigned int txqueue);
176 static void set_rx_mode(struct net_device *dev);
177 static void set_multicast_list(struct net_device *dev);
178 static const struct ethtool_ops netdev_ethtool_ops;
179 
180 static void tc589_detach(struct pcmcia_device *p_dev);
181 
182 static const struct net_device_ops el3_netdev_ops = {
183 	.ndo_open		= el3_open,
184 	.ndo_stop		= el3_close,
185 	.ndo_start_xmit		= el3_start_xmit,
186 	.ndo_tx_timeout		= el3_tx_timeout,
187 	.ndo_set_config		= el3_config,
188 	.ndo_get_stats		= el3_get_stats,
189 	.ndo_set_rx_mode	= set_multicast_list,
190 	.ndo_set_mac_address	= eth_mac_addr,
191 	.ndo_validate_addr	= eth_validate_addr,
192 };
193 
tc589_probe(struct pcmcia_device * link)194 static int tc589_probe(struct pcmcia_device *link)
195 {
196 	struct el3_private *lp;
197 	struct net_device *dev;
198 	int ret;
199 
200 	dev_dbg(&link->dev, "3c589_attach()\n");
201 
202 	/* Create new ethernet device */
203 	dev = alloc_etherdev(sizeof(struct el3_private));
204 	if (!dev)
205 		return -ENOMEM;
206 	lp = netdev_priv(dev);
207 	link->priv = dev;
208 	lp->p_dev = link;
209 
210 	spin_lock_init(&lp->lock);
211 	link->resource[0]->end = 16;
212 	link->resource[0]->flags |= IO_DATA_PATH_WIDTH_16;
213 
214 	link->config_flags |= CONF_ENABLE_IRQ;
215 	link->config_index = 1;
216 
217 	dev->netdev_ops = &el3_netdev_ops;
218 	dev->watchdog_timeo = TX_TIMEOUT;
219 
220 	dev->ethtool_ops = &netdev_ethtool_ops;
221 
222 	ret = tc589_config(link);
223 	if (ret)
224 		goto err_free_netdev;
225 
226 	return 0;
227 
228 err_free_netdev:
229 	free_netdev(dev);
230 	return ret;
231 }
232 
tc589_detach(struct pcmcia_device * link)233 static void tc589_detach(struct pcmcia_device *link)
234 {
235 	struct net_device *dev = link->priv;
236 
237 	dev_dbg(&link->dev, "3c589_detach\n");
238 
239 	unregister_netdev(dev);
240 
241 	tc589_release(link);
242 
243 	free_netdev(dev);
244 } /* tc589_detach */
245 
tc589_config(struct pcmcia_device * link)246 static int tc589_config(struct pcmcia_device *link)
247 {
248 	struct net_device *dev = link->priv;
249 	int ret, i, j, multi = 0, fifo;
250 	__be16 addr[ETH_ALEN / 2];
251 	unsigned int ioaddr;
252 	static const char * const ram_split[] = {"5:3", "3:1", "1:1", "3:5"};
253 	u8 *buf;
254 	size_t len;
255 
256 	dev_dbg(&link->dev, "3c589_config\n");
257 
258 	/* Is this a 3c562? */
259 	if (link->manf_id != MANFID_3COM)
260 		dev_info(&link->dev, "hmmm, is this really a 3Com card??\n");
261 	multi = (link->card_id == PRODID_3COM_3C562);
262 
263 	link->io_lines = 16;
264 
265 	/* For the 3c562, the base address must be xx00-xx7f */
266 	for (i = j = 0; j < 0x400; j += 0x10) {
267 		if (multi && (j & 0x80))
268 			continue;
269 		link->resource[0]->start = j ^ 0x300;
270 		i = pcmcia_request_io(link);
271 		if (i == 0)
272 			break;
273 	}
274 	if (i != 0)
275 		goto failed;
276 
277 	ret = pcmcia_request_irq(link, el3_interrupt);
278 	if (ret)
279 		goto failed;
280 
281 	ret = pcmcia_enable_device(link);
282 	if (ret)
283 		goto failed;
284 
285 	dev->irq = link->irq;
286 	dev->base_addr = link->resource[0]->start;
287 	ioaddr = dev->base_addr;
288 	EL3WINDOW(0);
289 
290 	/* The 3c589 has an extra EEPROM for configuration info, including
291 	 * the hardware address.  The 3c562 puts the address in the CIS.
292 	 */
293 	len = pcmcia_get_tuple(link, 0x88, &buf);
294 	if (buf && len >= 6) {
295 		for (i = 0; i < 3; i++)
296 			addr[i] = htons(le16_to_cpu(buf[i*2]));
297 		kfree(buf);
298 	} else {
299 		kfree(buf); /* 0 < len < 6 */
300 		for (i = 0; i < 3; i++)
301 			addr[i] = htons(read_eeprom(ioaddr, i));
302 		if (addr[0] == htons(0x6060)) {
303 			dev_err(&link->dev, "IO port conflict at 0x%03lx-0x%03lx\n",
304 					dev->base_addr, dev->base_addr+15);
305 			goto failed;
306 		}
307 	}
308 	eth_hw_addr_set(dev, (u8 *)addr);
309 
310 	/* The address and resource configuration register aren't loaded from
311 	 * the EEPROM and *must* be set to 0 and IRQ3 for the PCMCIA version.
312 	 */
313 
314 	outw(0x3f00, ioaddr + 8);
315 	fifo = inl(ioaddr);
316 
317 	/* The if_port symbol can be set when the module is loaded */
318 	if ((if_port >= 0) && (if_port <= 3))
319 		dev->if_port = if_port;
320 	else
321 		dev_err(&link->dev, "invalid if_port requested\n");
322 
323 	SET_NETDEV_DEV(dev, &link->dev);
324 
325 	if (register_netdev(dev) != 0) {
326 		dev_err(&link->dev, "register_netdev() failed\n");
327 		goto failed;
328 	}
329 
330 	netdev_info(dev, "3Com 3c%s, io %#3lx, irq %d, hw_addr %pM\n",
331 			(multi ? "562" : "589"), dev->base_addr, dev->irq,
332 			dev->dev_addr);
333 	netdev_info(dev, "  %dK FIFO split %s Rx:Tx, %s xcvr\n",
334 			(fifo & 7) ? 32 : 8, ram_split[(fifo >> 16) & 3],
335 			if_names[dev->if_port]);
336 	return 0;
337 
338 failed:
339 	tc589_release(link);
340 	return -ENODEV;
341 } /* tc589_config */
342 
tc589_release(struct pcmcia_device * link)343 static void tc589_release(struct pcmcia_device *link)
344 {
345 	pcmcia_disable_device(link);
346 }
347 
tc589_suspend(struct pcmcia_device * link)348 static int tc589_suspend(struct pcmcia_device *link)
349 {
350 	struct net_device *dev = link->priv;
351 
352 	if (link->open)
353 		netif_device_detach(dev);
354 
355 	return 0;
356 }
357 
tc589_resume(struct pcmcia_device * link)358 static int tc589_resume(struct pcmcia_device *link)
359 {
360 	struct net_device *dev = link->priv;
361 
362 	if (link->open) {
363 		tc589_reset(dev);
364 		netif_device_attach(dev);
365 	}
366 
367 	return 0;
368 }
369 
370 /*====================================================================*/
371 
372 /* Use this for commands that may take time to finish */
373 
tc589_wait_for_completion(struct net_device * dev,int cmd)374 static void tc589_wait_for_completion(struct net_device *dev, int cmd)
375 {
376 	int i = 100;
377 	outw(cmd, dev->base_addr + EL3_CMD);
378 	while (--i > 0)
379 		if (!(inw(dev->base_addr + EL3_STATUS) & 0x1000))
380 			break;
381 	if (i == 0)
382 		netdev_warn(dev, "command 0x%04x did not complete!\n", cmd);
383 }
384 
385 /* Read a word from the EEPROM using the regular EEPROM access register.
386  * Assume that we are in register window zero.
387  */
388 
read_eeprom(unsigned int ioaddr,int index)389 static u16 read_eeprom(unsigned int ioaddr, int index)
390 {
391 	int i;
392 	outw(EEPROM_READ + index, ioaddr + 10);
393 	/* Reading the eeprom takes 162 us */
394 	for (i = 1620; i >= 0; i--)
395 		if ((inw(ioaddr + 10) & EEPROM_BUSY) == 0)
396 			break;
397 	return inw(ioaddr + 12);
398 }
399 
400 /* Set transceiver type, perhaps to something other than what the user
401  * specified in dev->if_port.
402  */
403 
tc589_set_xcvr(struct net_device * dev,int if_port)404 static void tc589_set_xcvr(struct net_device *dev, int if_port)
405 {
406 	struct el3_private *lp = netdev_priv(dev);
407 	unsigned int ioaddr = dev->base_addr;
408 
409 	EL3WINDOW(0);
410 	switch (if_port) {
411 	case 0:
412 	case 1:
413 		outw(0, ioaddr + 6);
414 		break;
415 	case 2:
416 		outw(3<<14, ioaddr + 6);
417 		break;
418 	case 3:
419 		outw(1<<14, ioaddr + 6);
420 		break;
421 	}
422 	/* On PCMCIA, this just turns on the LED */
423 	outw((if_port == 2) ? StartCoax : StopCoax, ioaddr + EL3_CMD);
424 	/* 10baseT interface, enable link beat and jabber check. */
425 	EL3WINDOW(4);
426 	outw(MEDIA_LED | ((if_port < 2) ? MEDIA_TP : 0), ioaddr + WN4_MEDIA);
427 	EL3WINDOW(1);
428 	if (if_port == 2)
429 		lp->media_status = ((dev->if_port == 0) ? 0x8000 : 0x4000);
430 	else
431 		lp->media_status = ((dev->if_port == 0) ? 0x4010 : 0x8800);
432 }
433 
dump_status(struct net_device * dev)434 static void dump_status(struct net_device *dev)
435 {
436 	unsigned int ioaddr = dev->base_addr;
437 	EL3WINDOW(1);
438 	netdev_info(dev, "  irq status %04x, rx status %04x, tx status %02x  tx free %04x\n",
439 			inw(ioaddr+EL3_STATUS), inw(ioaddr+RX_STATUS),
440 			inb(ioaddr+TX_STATUS), inw(ioaddr+TX_FREE));
441 	EL3WINDOW(4);
442 	netdev_info(dev, "  diagnostics: fifo %04x net %04x ethernet %04x media %04x\n",
443 			inw(ioaddr+0x04), inw(ioaddr+0x06), inw(ioaddr+0x08),
444 			inw(ioaddr+0x0a));
445 	EL3WINDOW(1);
446 }
447 
448 /* Reset and restore all of the 3c589 registers. */
tc589_reset(struct net_device * dev)449 static void tc589_reset(struct net_device *dev)
450 {
451 	unsigned int ioaddr = dev->base_addr;
452 	int i;
453 
454 	EL3WINDOW(0);
455 	outw(0x0001, ioaddr + 4);			/* Activate board. */
456 	outw(0x3f00, ioaddr + 8);			/* Set the IRQ line. */
457 
458 	/* Set the station address in window 2. */
459 	EL3WINDOW(2);
460 	for (i = 0; i < 6; i++)
461 		outb(dev->dev_addr[i], ioaddr + i);
462 
463 	tc589_set_xcvr(dev, dev->if_port);
464 
465 	/* Switch to the stats window, and clear all stats by reading. */
466 	outw(StatsDisable, ioaddr + EL3_CMD);
467 	EL3WINDOW(6);
468 	for (i = 0; i < 9; i++)
469 		inb(ioaddr+i);
470 	inw(ioaddr + 10);
471 	inw(ioaddr + 12);
472 
473 	/* Switch to register set 1 for normal use. */
474 	EL3WINDOW(1);
475 
476 	set_rx_mode(dev);
477 	outw(StatsEnable, ioaddr + EL3_CMD); /* Turn on statistics. */
478 	outw(RxEnable, ioaddr + EL3_CMD); /* Enable the receiver. */
479 	outw(TxEnable, ioaddr + EL3_CMD); /* Enable transmitter. */
480 	/* Allow status bits to be seen. */
481 	outw(SetStatusEnb | 0xff, ioaddr + EL3_CMD);
482 	/* Ack all pending events, and set active indicator mask. */
483 	outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
484 	 ioaddr + EL3_CMD);
485 	outw(SetIntrEnb | IntLatch | TxAvailable | RxComplete | StatsFull
486 	 | AdapterFailure, ioaddr + EL3_CMD);
487 }
488 
netdev_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)489 static void netdev_get_drvinfo(struct net_device *dev,
490 			       struct ethtool_drvinfo *info)
491 {
492 	strscpy(info->driver, DRV_NAME, sizeof(info->driver));
493 	snprintf(info->bus_info, sizeof(info->bus_info),
494 		"PCMCIA 0x%lx", dev->base_addr);
495 }
496 
497 static const struct ethtool_ops netdev_ethtool_ops = {
498 	.get_drvinfo		= netdev_get_drvinfo,
499 };
500 
el3_config(struct net_device * dev,struct ifmap * map)501 static int el3_config(struct net_device *dev, struct ifmap *map)
502 {
503 	if ((map->port != (u_char)(-1)) && (map->port != dev->if_port)) {
504 		if (map->port <= 3) {
505 			dev->if_port = map->port;
506 			netdev_info(dev, "switched to %s port\n", if_names[dev->if_port]);
507 			tc589_set_xcvr(dev, dev->if_port);
508 		} else {
509 			return -EINVAL;
510 		}
511 	}
512 	return 0;
513 }
514 
el3_open(struct net_device * dev)515 static int el3_open(struct net_device *dev)
516 {
517 	struct el3_private *lp = netdev_priv(dev);
518 	struct pcmcia_device *link = lp->p_dev;
519 
520 	if (!pcmcia_dev_present(link))
521 		return -ENODEV;
522 
523 	link->open++;
524 	netif_start_queue(dev);
525 
526 	tc589_reset(dev);
527 	timer_setup(&lp->media, media_check, 0);
528 	mod_timer(&lp->media, jiffies + HZ);
529 
530 	dev_dbg(&link->dev, "%s: opened, status %4.4x.\n",
531 	  dev->name, inw(dev->base_addr + EL3_STATUS));
532 
533 	return 0;
534 }
535 
el3_tx_timeout(struct net_device * dev,unsigned int txqueue)536 static void el3_tx_timeout(struct net_device *dev, unsigned int txqueue)
537 {
538 	unsigned int ioaddr = dev->base_addr;
539 
540 	netdev_warn(dev, "Transmit timed out!\n");
541 	dump_status(dev);
542 	dev->stats.tx_errors++;
543 	netif_trans_update(dev); /* prevent tx timeout */
544 	/* Issue TX_RESET and TX_START commands. */
545 	tc589_wait_for_completion(dev, TxReset);
546 	outw(TxEnable, ioaddr + EL3_CMD);
547 	netif_wake_queue(dev);
548 }
549 
pop_tx_status(struct net_device * dev)550 static void pop_tx_status(struct net_device *dev)
551 {
552 	unsigned int ioaddr = dev->base_addr;
553 	int i;
554 
555 	/* Clear the Tx status stack. */
556 	for (i = 32; i > 0; i--) {
557 		u_char tx_status = inb(ioaddr + TX_STATUS);
558 		if (!(tx_status & 0x84))
559 			break;
560 		/* reset transmitter on jabber error or underrun */
561 		if (tx_status & 0x30)
562 			tc589_wait_for_completion(dev, TxReset);
563 		if (tx_status & 0x38) {
564 			netdev_dbg(dev, "transmit error: status 0x%02x\n", tx_status);
565 			outw(TxEnable, ioaddr + EL3_CMD);
566 			dev->stats.tx_aborted_errors++;
567 		}
568 		outb(0x00, ioaddr + TX_STATUS); /* Pop the status stack. */
569 	}
570 }
571 
el3_start_xmit(struct sk_buff * skb,struct net_device * dev)572 static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
573 					struct net_device *dev)
574 {
575 	unsigned int ioaddr = dev->base_addr;
576 	struct el3_private *priv = netdev_priv(dev);
577 	unsigned long flags;
578 
579 	netdev_dbg(dev, "el3_start_xmit(length = %ld) called, status %4.4x.\n",
580 	       (long)skb->len, inw(ioaddr + EL3_STATUS));
581 
582 	spin_lock_irqsave(&priv->lock, flags);
583 
584 	dev->stats.tx_bytes += skb->len;
585 
586 	/* Put out the doubleword header... */
587 	outw(skb->len, ioaddr + TX_FIFO);
588 	outw(0x00, ioaddr + TX_FIFO);
589 	/* ... and the packet rounded to a doubleword. */
590 	outsl(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);
591 
592 	if (inw(ioaddr + TX_FREE) <= 1536) {
593 		netif_stop_queue(dev);
594 		/* Interrupt us when the FIFO has room for max-sized packet. */
595 		outw(SetTxThreshold + 1536, ioaddr + EL3_CMD);
596 	}
597 
598 	pop_tx_status(dev);
599 	spin_unlock_irqrestore(&priv->lock, flags);
600 	dev_kfree_skb(skb);
601 
602 	return NETDEV_TX_OK;
603 }
604 
605 /* The EL3 interrupt handler. */
el3_interrupt(int irq,void * dev_id)606 static irqreturn_t el3_interrupt(int irq, void *dev_id)
607 {
608 	struct net_device *dev = (struct net_device *) dev_id;
609 	struct el3_private *lp = netdev_priv(dev);
610 	unsigned int ioaddr;
611 	__u16 status;
612 	int i = 0, handled = 1;
613 
614 	if (!netif_device_present(dev))
615 		return IRQ_NONE;
616 
617 	ioaddr = dev->base_addr;
618 
619 	netdev_dbg(dev, "interrupt, status %4.4x.\n", inw(ioaddr + EL3_STATUS));
620 
621 	spin_lock(&lp->lock);
622 	while ((status = inw(ioaddr + EL3_STATUS)) &
623 	(IntLatch | RxComplete | StatsFull)) {
624 		if ((status & 0xe000) != 0x2000) {
625 			netdev_dbg(dev, "interrupt from dead card\n");
626 			handled = 0;
627 			break;
628 		}
629 		if (status & RxComplete)
630 			el3_rx(dev);
631 		if (status & TxAvailable) {
632 			netdev_dbg(dev, "    TX room bit was handled.\n");
633 			/* There's room in the FIFO for a full-sized packet. */
634 			outw(AckIntr | TxAvailable, ioaddr + EL3_CMD);
635 			netif_wake_queue(dev);
636 		}
637 		if (status & TxComplete)
638 			pop_tx_status(dev);
639 		if (status & (AdapterFailure | RxEarly | StatsFull)) {
640 			/* Handle all uncommon interrupts. */
641 			if (status & StatsFull)		/* Empty statistics. */
642 				update_stats(dev);
643 			if (status & RxEarly) {
644 				/* Rx early is unused. */
645 				el3_rx(dev);
646 				outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
647 			}
648 			if (status & AdapterFailure) {
649 				u16 fifo_diag;
650 				EL3WINDOW(4);
651 				fifo_diag = inw(ioaddr + 4);
652 				EL3WINDOW(1);
653 				netdev_warn(dev, "adapter failure, FIFO diagnostic register %04x.\n",
654 			    fifo_diag);
655 				if (fifo_diag & 0x0400) {
656 					/* Tx overrun */
657 					tc589_wait_for_completion(dev, TxReset);
658 					outw(TxEnable, ioaddr + EL3_CMD);
659 				}
660 				if (fifo_diag & 0x2000) {
661 					/* Rx underrun */
662 					tc589_wait_for_completion(dev, RxReset);
663 					set_rx_mode(dev);
664 					outw(RxEnable, ioaddr + EL3_CMD);
665 				}
666 				outw(AckIntr | AdapterFailure, ioaddr + EL3_CMD);
667 			}
668 		}
669 		if (++i > 10) {
670 			netdev_err(dev, "infinite loop in interrupt, status %4.4x.\n",
671 					status);
672 			/* Clear all interrupts */
673 			outw(AckIntr | 0xFF, ioaddr + EL3_CMD);
674 			break;
675 		}
676 		/* Acknowledge the IRQ. */
677 		outw(AckIntr | IntReq | IntLatch, ioaddr + EL3_CMD);
678 	}
679 	lp->last_irq = jiffies;
680 	spin_unlock(&lp->lock);
681 	netdev_dbg(dev, "exiting interrupt, status %4.4x.\n",
682 			inw(ioaddr + EL3_STATUS));
683 	return IRQ_RETVAL(handled);
684 }
685 
media_check(struct timer_list * t)686 static void media_check(struct timer_list *t)
687 {
688 	struct el3_private *lp = from_timer(lp, t, media);
689 	struct net_device *dev = lp->p_dev->priv;
690 	unsigned int ioaddr = dev->base_addr;
691 	u16 media, errs;
692 	unsigned long flags;
693 
694 	if (!netif_device_present(dev))
695 		goto reschedule;
696 
697 	/* Check for pending interrupt with expired latency timer: with
698 	 * this, we can limp along even if the interrupt is blocked
699 	 */
700 	if ((inw(ioaddr + EL3_STATUS) & IntLatch) &&
701 	(inb(ioaddr + EL3_TIMER) == 0xff)) {
702 		if (!lp->fast_poll)
703 			netdev_warn(dev, "interrupt(s) dropped!\n");
704 
705 		local_irq_save(flags);
706 		el3_interrupt(dev->irq, dev);
707 		local_irq_restore(flags);
708 
709 		lp->fast_poll = HZ;
710 	}
711 	if (lp->fast_poll) {
712 		lp->fast_poll--;
713 		lp->media.expires = jiffies + HZ/100;
714 		add_timer(&lp->media);
715 		return;
716 	}
717 
718 	/* lp->lock guards the EL3 window. Window should always be 1 except
719 	 * when the lock is held
720 	 */
721 
722 	spin_lock_irqsave(&lp->lock, flags);
723 	EL3WINDOW(4);
724 	media = inw(ioaddr+WN4_MEDIA) & 0xc810;
725 
726 	/* Ignore collisions unless we've had no irq's recently */
727 	if (time_before(jiffies, lp->last_irq + HZ)) {
728 		media &= ~0x0010;
729 	} else {
730 		/* Try harder to detect carrier errors */
731 		EL3WINDOW(6);
732 		outw(StatsDisable, ioaddr + EL3_CMD);
733 		errs = inb(ioaddr + 0);
734 		outw(StatsEnable, ioaddr + EL3_CMD);
735 		dev->stats.tx_carrier_errors += errs;
736 		if (errs || (lp->media_status & 0x0010))
737 			media |= 0x0010;
738 	}
739 
740 	if (media != lp->media_status) {
741 		if ((media & lp->media_status & 0x8000) &&
742 				((lp->media_status ^ media) & 0x0800))
743 		netdev_info(dev, "%s link beat\n",
744 				(lp->media_status & 0x0800 ? "lost" : "found"));
745 		else if ((media & lp->media_status & 0x4000) &&
746 		 ((lp->media_status ^ media) & 0x0010))
747 		netdev_info(dev, "coax cable %s\n",
748 				(lp->media_status & 0x0010 ? "ok" : "problem"));
749 		if (dev->if_port == 0) {
750 			if (media & 0x8000) {
751 				if (media & 0x0800)
752 					netdev_info(dev, "flipped to 10baseT\n");
753 				else
754 			tc589_set_xcvr(dev, 2);
755 			} else if (media & 0x4000) {
756 				if (media & 0x0010)
757 					tc589_set_xcvr(dev, 1);
758 				else
759 					netdev_info(dev, "flipped to 10base2\n");
760 			}
761 		}
762 		lp->media_status = media;
763 	}
764 
765 	EL3WINDOW(1);
766 	spin_unlock_irqrestore(&lp->lock, flags);
767 
768 reschedule:
769 	lp->media.expires = jiffies + HZ;
770 	add_timer(&lp->media);
771 }
772 
el3_get_stats(struct net_device * dev)773 static struct net_device_stats *el3_get_stats(struct net_device *dev)
774 {
775 	struct el3_private *lp = netdev_priv(dev);
776 	unsigned long flags;
777 	struct pcmcia_device *link = lp->p_dev;
778 
779 	if (pcmcia_dev_present(link)) {
780 		spin_lock_irqsave(&lp->lock, flags);
781 		update_stats(dev);
782 		spin_unlock_irqrestore(&lp->lock, flags);
783 	}
784 	return &dev->stats;
785 }
786 
787 /* Update statistics.  We change to register window 6, so this should be run
788 * single-threaded if the device is active. This is expected to be a rare
789 * operation, and it's simpler for the rest of the driver to assume that
790 * window 1 is always valid rather than use a special window-state variable.
791 *
792 * Caller must hold the lock for this
793 */
794 
update_stats(struct net_device * dev)795 static void update_stats(struct net_device *dev)
796 {
797 	unsigned int ioaddr = dev->base_addr;
798 
799 	netdev_dbg(dev, "updating the statistics.\n");
800 	/* Turn off statistics updates while reading. */
801 	outw(StatsDisable, ioaddr + EL3_CMD);
802 	/* Switch to the stats window, and read everything. */
803 	EL3WINDOW(6);
804 	dev->stats.tx_carrier_errors	+= inb(ioaddr + 0);
805 	dev->stats.tx_heartbeat_errors	+= inb(ioaddr + 1);
806 	/* Multiple collisions. */
807 	inb(ioaddr + 2);
808 	dev->stats.collisions		+= inb(ioaddr + 3);
809 	dev->stats.tx_window_errors		+= inb(ioaddr + 4);
810 	dev->stats.rx_fifo_errors		+= inb(ioaddr + 5);
811 	dev->stats.tx_packets		+= inb(ioaddr + 6);
812 	/* Rx packets   */
813 	inb(ioaddr + 7);
814 	/* Tx deferrals */
815 	inb(ioaddr + 8);
816 	/* Rx octets */
817 	inw(ioaddr + 10);
818 	/* Tx octets */
819 	inw(ioaddr + 12);
820 
821 	/* Back to window 1, and turn statistics back on. */
822 	EL3WINDOW(1);
823 	outw(StatsEnable, ioaddr + EL3_CMD);
824 }
825 
el3_rx(struct net_device * dev)826 static int el3_rx(struct net_device *dev)
827 {
828 	unsigned int ioaddr = dev->base_addr;
829 	int worklimit = 32;
830 	short rx_status;
831 
832 	netdev_dbg(dev, "in rx_packet(), status %4.4x, rx_status %4.4x.\n",
833 	       inw(ioaddr+EL3_STATUS), inw(ioaddr+RX_STATUS));
834 	while (!((rx_status = inw(ioaddr + RX_STATUS)) & 0x8000) &&
835 		    worklimit > 0) {
836 		worklimit--;
837 		if (rx_status & 0x4000) { /* Error, update stats. */
838 			short error = rx_status & 0x3800;
839 			dev->stats.rx_errors++;
840 			switch (error) {
841 			case 0x0000:
842 				dev->stats.rx_over_errors++;
843 				break;
844 			case 0x0800:
845 				dev->stats.rx_length_errors++;
846 				break;
847 			case 0x1000:
848 				dev->stats.rx_frame_errors++;
849 				break;
850 			case 0x1800:
851 				dev->stats.rx_length_errors++;
852 				break;
853 			case 0x2000:
854 				dev->stats.rx_frame_errors++;
855 				break;
856 			case 0x2800:
857 				dev->stats.rx_crc_errors++;
858 				break;
859 			}
860 		} else {
861 			short pkt_len = rx_status & 0x7ff;
862 			struct sk_buff *skb;
863 
864 			skb = netdev_alloc_skb(dev, pkt_len + 5);
865 
866 			netdev_dbg(dev, "    Receiving packet size %d status %4.4x.\n",
867 		       pkt_len, rx_status);
868 			if (skb != NULL) {
869 				skb_reserve(skb, 2);
870 				insl(ioaddr+RX_FIFO, skb_put(skb, pkt_len),
871 			(pkt_len+3)>>2);
872 				skb->protocol = eth_type_trans(skb, dev);
873 				netif_rx(skb);
874 				dev->stats.rx_packets++;
875 				dev->stats.rx_bytes += pkt_len;
876 			} else {
877 				netdev_dbg(dev, "couldn't allocate a sk_buff of size %d.\n",
878 			   pkt_len);
879 				dev->stats.rx_dropped++;
880 			}
881 		}
882 		/* Pop the top of the Rx FIFO */
883 		tc589_wait_for_completion(dev, RxDiscard);
884 	}
885 	if (worklimit == 0)
886 		netdev_warn(dev, "too much work in el3_rx!\n");
887 	return 0;
888 }
889 
set_rx_mode(struct net_device * dev)890 static void set_rx_mode(struct net_device *dev)
891 {
892 	unsigned int ioaddr = dev->base_addr;
893 	u16 opts = SetRxFilter | RxStation | RxBroadcast;
894 
895 	if (dev->flags & IFF_PROMISC)
896 		opts |= RxMulticast | RxProm;
897 	else if (!netdev_mc_empty(dev) || (dev->flags & IFF_ALLMULTI))
898 		opts |= RxMulticast;
899 	outw(opts, ioaddr + EL3_CMD);
900 }
901 
set_multicast_list(struct net_device * dev)902 static void set_multicast_list(struct net_device *dev)
903 {
904 	struct el3_private *priv = netdev_priv(dev);
905 	unsigned long flags;
906 
907 	spin_lock_irqsave(&priv->lock, flags);
908 	set_rx_mode(dev);
909 	spin_unlock_irqrestore(&priv->lock, flags);
910 }
911 
el3_close(struct net_device * dev)912 static int el3_close(struct net_device *dev)
913 {
914 	struct el3_private *lp = netdev_priv(dev);
915 	struct pcmcia_device *link = lp->p_dev;
916 	unsigned int ioaddr = dev->base_addr;
917 
918 	dev_dbg(&link->dev, "%s: shutting down ethercard.\n", dev->name);
919 
920 	if (pcmcia_dev_present(link)) {
921 		/* Turn off statistics ASAP.  We update dev->stats below. */
922 		outw(StatsDisable, ioaddr + EL3_CMD);
923 
924 		/* Disable the receiver and transmitter. */
925 		outw(RxDisable, ioaddr + EL3_CMD);
926 		outw(TxDisable, ioaddr + EL3_CMD);
927 
928 		if (dev->if_port == 2)
929 			/* Turn off thinnet power.  Green! */
930 			outw(StopCoax, ioaddr + EL3_CMD);
931 		else if (dev->if_port == 1) {
932 			/* Disable link beat and jabber */
933 			EL3WINDOW(4);
934 			outw(0, ioaddr + WN4_MEDIA);
935 		}
936 
937 		/* Switching back to window 0 disables the IRQ. */
938 		EL3WINDOW(0);
939 		/* But we explicitly zero the IRQ line select anyway. */
940 		outw(0x0f00, ioaddr + WN0_IRQ);
941 
942 		/* Check if the card still exists */
943 		if ((inw(ioaddr+EL3_STATUS) & 0xe000) == 0x2000)
944 			update_stats(dev);
945 	}
946 
947 	link->open--;
948 	netif_stop_queue(dev);
949 	del_timer_sync(&lp->media);
950 
951 	return 0;
952 }
953 
954 static const struct pcmcia_device_id tc589_ids[] = {
955 	PCMCIA_MFC_DEVICE_MANF_CARD(0, 0x0101, 0x0562),
956 	PCMCIA_MFC_DEVICE_PROD_ID1(0, "Motorola MARQUIS", 0xf03e4e77),
957 	PCMCIA_DEVICE_MANF_CARD(0x0101, 0x0589),
958 	PCMCIA_DEVICE_PROD_ID12("Farallon", "ENet", 0x58d93fc4, 0x992c2202),
959 	PCMCIA_MFC_DEVICE_CIS_MANF_CARD(0, 0x0101, 0x0035, "cis/3CXEM556.cis"),
960 	PCMCIA_MFC_DEVICE_CIS_MANF_CARD(0, 0x0101, 0x003d, "cis/3CXEM556.cis"),
961 	PCMCIA_DEVICE_NULL,
962 };
963 MODULE_DEVICE_TABLE(pcmcia, tc589_ids);
964 
965 static struct pcmcia_driver tc589_driver = {
966 	.owner		= THIS_MODULE,
967 	.name		= "3c589_cs",
968 	.probe		= tc589_probe,
969 	.remove		= tc589_detach,
970 	.id_table	= tc589_ids,
971 	.suspend	= tc589_suspend,
972 	.resume		= tc589_resume,
973 };
974 module_pcmcia_driver(tc589_driver);
975