1 /*======================================================================
2 
3     A PCMCIA ethernet driver for Asix AX88190-based cards
4 
5     The Asix AX88190 is a NS8390-derived chipset with a few nasty
6     idiosyncracies that make it very inconvenient to support with a
7     standard 8390 driver.  This driver is based on pcnet_cs, with the
8     tweaked 8390 code grafted on the end.  Much of what I did was to
9     clean up and update a similar driver supplied by Asix, which was
10     adapted by William Lee, william@asix.com.tw.
11 
12     Copyright (C) 2001 David A. Hinds -- dahinds@users.sourceforge.net
13 
14     axnet_cs.c 1.28 2002/06/29 06:27:37
15 
16     The network driver code is based on Donald Becker's NE2000 code:
17 
18     Written 1992,1993 by Donald Becker.
19     Copyright 1993 United States Government as represented by the
20     Director, National Security Agency.  This software may be used and
21     distributed according to the terms of the GNU General Public License,
22     incorporated herein by reference.
23     Donald Becker may be reached at becker@scyld.com
24 
25 ======================================================================*/
26 
27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/ptrace.h>
32 #include <linux/string.h>
33 #include <linux/timer.h>
34 #include <linux/delay.h>
35 #include <linux/spinlock.h>
36 #include <linux/netdevice.h>
37 #include <linux/etherdevice.h>
38 #include <linux/crc32.h>
39 #include <linux/mii.h>
40 #include "8390.h"
41 
42 #include <pcmcia/cistpl.h>
43 #include <pcmcia/ciscode.h>
44 #include <pcmcia/ds.h>
45 #include <pcmcia/cisreg.h>
46 
47 #include <asm/io.h>
48 #include <asm/byteorder.h>
49 #include <asm/uaccess.h>
50 
51 #define AXNET_CMD	0x00
52 #define AXNET_DATAPORT	0x10	/* NatSemi-defined port window offset. */
53 #define AXNET_RESET	0x1f	/* Issue a read to reset, a write to clear. */
54 #define AXNET_MII_EEP	0x14	/* Offset of MII access port */
55 #define AXNET_TEST	0x15	/* Offset of TEST Register port */
56 #define AXNET_GPIO	0x17	/* Offset of General Purpose Register Port */
57 
58 #define AXNET_START_PG	0x40	/* First page of TX buffer */
59 #define AXNET_STOP_PG	0x80	/* Last page +1 of RX ring */
60 
61 #define AXNET_RDC_TIMEOUT 0x02	/* Max wait in jiffies for Tx RDC */
62 
63 #define IS_AX88190	0x0001
64 #define IS_AX88790	0x0002
65 
66 /*====================================================================*/
67 
68 /* Module parameters */
69 
70 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
71 MODULE_DESCRIPTION("Asix AX88190 PCMCIA ethernet driver");
72 MODULE_LICENSE("GPL");
73 
74 
75 /*====================================================================*/
76 
77 static int axnet_config(struct pcmcia_device *link);
78 static void axnet_release(struct pcmcia_device *link);
79 static int axnet_open(struct net_device *dev);
80 static int axnet_close(struct net_device *dev);
81 static int axnet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
82 static netdev_tx_t axnet_start_xmit(struct sk_buff *skb,
83 					  struct net_device *dev);
84 static struct net_device_stats *get_stats(struct net_device *dev);
85 static void set_multicast_list(struct net_device *dev);
86 static void axnet_tx_timeout(struct net_device *dev);
87 static irqreturn_t ei_irq_wrapper(int irq, void *dev_id);
88 static void ei_watchdog(u_long arg);
89 static void axnet_reset_8390(struct net_device *dev);
90 
91 static int mdio_read(unsigned int addr, int phy_id, int loc);
92 static void mdio_write(unsigned int addr, int phy_id, int loc, int value);
93 
94 static void get_8390_hdr(struct net_device *,
95 			 struct e8390_pkt_hdr *, int);
96 static void block_input(struct net_device *dev, int count,
97 			struct sk_buff *skb, int ring_offset);
98 static void block_output(struct net_device *dev, int count,
99 			 const u_char *buf, const int start_page);
100 
101 static void axnet_detach(struct pcmcia_device *p_dev);
102 
103 static void AX88190_init(struct net_device *dev, int startp);
104 static int ax_open(struct net_device *dev);
105 static int ax_close(struct net_device *dev);
106 static irqreturn_t ax_interrupt(int irq, void *dev_id);
107 static u32 axnet_msg_enable;
108 
109 /*====================================================================*/
110 
111 struct axnet_dev {
112 	struct pcmcia_device	*p_dev;
113 	caddr_t	base;
114 	struct timer_list	watchdog;
115 	int	stale, fast_poll;
116 	u_short	link_status;
117 	u_char	duplex_flag;
118 	int	phy_id;
119 	int	flags;
120 	int	active_low;
121 };
122 
123 static inline struct axnet_dev *PRIV(struct net_device *dev)
124 {
125 	void *p = (char *)netdev_priv(dev) + sizeof(struct ei_device);
126 	return p;
127 }
128 
129 static const struct net_device_ops axnet_netdev_ops = {
130 	.ndo_open 		= axnet_open,
131 	.ndo_stop		= axnet_close,
132 	.ndo_do_ioctl		= axnet_ioctl,
133 	.ndo_start_xmit		= axnet_start_xmit,
134 	.ndo_tx_timeout		= axnet_tx_timeout,
135 	.ndo_get_stats		= get_stats,
136 	.ndo_set_rx_mode	= set_multicast_list,
137 	.ndo_change_mtu		= eth_change_mtu,
138 	.ndo_set_mac_address 	= eth_mac_addr,
139 	.ndo_validate_addr	= eth_validate_addr,
140 };
141 
142 static int axnet_probe(struct pcmcia_device *link)
143 {
144     struct axnet_dev *info;
145     struct net_device *dev;
146     struct ei_device *ei_local;
147 
148     dev_dbg(&link->dev, "axnet_attach()\n");
149 
150     dev = alloc_etherdev(sizeof(struct ei_device) + sizeof(struct axnet_dev));
151     if (!dev)
152 	return -ENOMEM;
153 
154     ei_local = netdev_priv(dev);
155     ei_local->msg_enable = axnet_msg_enable;
156     spin_lock_init(&ei_local->page_lock);
157 
158     info = PRIV(dev);
159     info->p_dev = link;
160     link->priv = dev;
161     link->config_flags |= CONF_ENABLE_IRQ;
162 
163     dev->netdev_ops = &axnet_netdev_ops;
164 
165     dev->watchdog_timeo = TX_TIMEOUT;
166 
167     return axnet_config(link);
168 } /* axnet_attach */
169 
170 static void axnet_detach(struct pcmcia_device *link)
171 {
172     struct net_device *dev = link->priv;
173 
174     dev_dbg(&link->dev, "axnet_detach(0x%p)\n", link);
175 
176     unregister_netdev(dev);
177 
178     axnet_release(link);
179 
180     free_netdev(dev);
181 } /* axnet_detach */
182 
183 /*======================================================================
184 
185     This probes for a card's hardware address by reading the PROM.
186 
187 ======================================================================*/
188 
189 static int get_prom(struct pcmcia_device *link)
190 {
191     struct net_device *dev = link->priv;
192     unsigned int ioaddr = dev->base_addr;
193     int i, j;
194 
195     /* This is based on drivers/net/ethernet/8390/ne.c */
196     struct {
197 	u_char value, offset;
198     } program_seq[] = {
199 	{E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, /* Select page 0*/
200 	{0x01,	EN0_DCFG},	/* Set word-wide access. */
201 	{0x00,	EN0_RCNTLO},	/* Clear the count regs. */
202 	{0x00,	EN0_RCNTHI},
203 	{0x00,	EN0_IMR},	/* Mask completion irq. */
204 	{0xFF,	EN0_ISR},
205 	{E8390_RXOFF|0x40, EN0_RXCR},	/* 0x60  Set to monitor */
206 	{E8390_TXOFF, EN0_TXCR},	/* 0x02  and loopback mode. */
207 	{0x10,	EN0_RCNTLO},
208 	{0x00,	EN0_RCNTHI},
209 	{0x00,	EN0_RSARLO},	/* DMA starting at 0x0400. */
210 	{0x04,	EN0_RSARHI},
211 	{E8390_RREAD+E8390_START, E8390_CMD},
212     };
213 
214     /* Not much of a test, but the alternatives are messy */
215     if (link->config_base != 0x03c0)
216 	return 0;
217 
218     axnet_reset_8390(dev);
219     mdelay(10);
220 
221     for (i = 0; i < ARRAY_SIZE(program_seq); i++)
222 	outb_p(program_seq[i].value, ioaddr + program_seq[i].offset);
223 
224     for (i = 0; i < 6; i += 2) {
225 	j = inw(ioaddr + AXNET_DATAPORT);
226 	dev->dev_addr[i] = j & 0xff;
227 	dev->dev_addr[i+1] = j >> 8;
228     }
229     return 1;
230 } /* get_prom */
231 
232 static int try_io_port(struct pcmcia_device *link)
233 {
234     int j, ret;
235     link->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
236     link->resource[1]->flags &= ~IO_DATA_PATH_WIDTH;
237     if (link->resource[0]->end == 32) {
238 	link->resource[0]->flags |= IO_DATA_PATH_WIDTH_AUTO;
239 	/* for master/slave multifunction cards */
240 	if (link->resource[1]->end > 0)
241 	    link->resource[1]->flags |= IO_DATA_PATH_WIDTH_8;
242     } else {
243 	/* This should be two 16-port windows */
244 	link->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
245 	link->resource[1]->flags |= IO_DATA_PATH_WIDTH_16;
246     }
247     if (link->resource[0]->start == 0) {
248 	for (j = 0; j < 0x400; j += 0x20) {
249 	    link->resource[0]->start = j ^ 0x300;
250 	    link->resource[1]->start = (j ^ 0x300) + 0x10;
251 	    link->io_lines = 16;
252 	    ret = pcmcia_request_io(link);
253 	    if (ret == 0)
254 		    return ret;
255 	}
256 	return ret;
257     } else {
258 	return pcmcia_request_io(link);
259     }
260 }
261 
262 static int axnet_configcheck(struct pcmcia_device *p_dev, void *priv_data)
263 {
264 	if (p_dev->config_index == 0)
265 		return -EINVAL;
266 
267 	p_dev->config_index = 0x05;
268 	if (p_dev->resource[0]->end + p_dev->resource[1]->end < 32)
269 		return -ENODEV;
270 
271 	return try_io_port(p_dev);
272 }
273 
274 static int axnet_config(struct pcmcia_device *link)
275 {
276     struct net_device *dev = link->priv;
277     struct axnet_dev *info = PRIV(dev);
278     int i, j, j2, ret;
279 
280     dev_dbg(&link->dev, "axnet_config(0x%p)\n", link);
281 
282     /* don't trust the CIS on this; Linksys got it wrong */
283     link->config_regs = 0x63;
284     link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
285     ret = pcmcia_loop_config(link, axnet_configcheck, NULL);
286     if (ret != 0)
287 	goto failed;
288 
289     if (!link->irq)
290 	    goto failed;
291 
292     if (resource_size(link->resource[1]) == 8)
293 	link->config_flags |= CONF_ENABLE_SPKR;
294 
295     ret = pcmcia_enable_device(link);
296     if (ret)
297 	    goto failed;
298 
299     dev->irq = link->irq;
300     dev->base_addr = link->resource[0]->start;
301 
302     if (!get_prom(link)) {
303 	pr_notice("this is not an AX88190 card!\n");
304 	pr_notice("use pcnet_cs instead.\n");
305 	goto failed;
306     }
307 
308     ei_status.name = "AX88190";
309     ei_status.word16 = 1;
310     ei_status.tx_start_page = AXNET_START_PG;
311     ei_status.rx_start_page = AXNET_START_PG + TX_PAGES;
312     ei_status.stop_page = AXNET_STOP_PG;
313     ei_status.reset_8390 = axnet_reset_8390;
314     ei_status.get_8390_hdr = get_8390_hdr;
315     ei_status.block_input = block_input;
316     ei_status.block_output = block_output;
317 
318     if (inb(dev->base_addr + AXNET_TEST) != 0)
319 	info->flags |= IS_AX88790;
320     else
321 	info->flags |= IS_AX88190;
322 
323     if (info->flags & IS_AX88790)
324 	outb(0x10, dev->base_addr + AXNET_GPIO);  /* select Internal PHY */
325 
326     info->active_low = 0;
327 
328     for (i = 0; i < 32; i++) {
329 	j = mdio_read(dev->base_addr + AXNET_MII_EEP, i, 1);
330 	j2 = mdio_read(dev->base_addr + AXNET_MII_EEP, i, 2);
331 	if (j == j2) continue;
332 	if ((j != 0) && (j != 0xffff)) break;
333     }
334 
335     if (i == 32) {
336 	/* Maybe PHY is in power down mode. (PPD_SET = 1)
337 	   Bit 2 of CCSR is active low. */
338 	pcmcia_write_config_byte(link, CISREG_CCSR, 0x04);
339 	for (i = 0; i < 32; i++) {
340 	    j = mdio_read(dev->base_addr + AXNET_MII_EEP, i, 1);
341 	    j2 = mdio_read(dev->base_addr + AXNET_MII_EEP, i, 2);
342 	    if (j == j2) continue;
343 	    if ((j != 0) && (j != 0xffff)) {
344 		info->active_low = 1;
345 		break;
346 	    }
347 	}
348     }
349 
350     info->phy_id = (i < 32) ? i : -1;
351     SET_NETDEV_DEV(dev, &link->dev);
352 
353     if (register_netdev(dev) != 0) {
354 	pr_notice("register_netdev() failed\n");
355 	goto failed;
356     }
357 
358     netdev_info(dev, "Asix AX88%d90: io %#3lx, irq %d, hw_addr %pM\n",
359 		((info->flags & IS_AX88790) ? 7 : 1),
360 		dev->base_addr, dev->irq, dev->dev_addr);
361     if (info->phy_id != -1) {
362 	netdev_dbg(dev, "  MII transceiver at index %d, status %x\n",
363 		   info->phy_id, j);
364     } else {
365 	netdev_notice(dev, "  No MII transceivers found!\n");
366     }
367     return 0;
368 
369 failed:
370     axnet_release(link);
371     return -ENODEV;
372 } /* axnet_config */
373 
374 static void axnet_release(struct pcmcia_device *link)
375 {
376 	pcmcia_disable_device(link);
377 }
378 
379 static int axnet_suspend(struct pcmcia_device *link)
380 {
381 	struct net_device *dev = link->priv;
382 
383 	if (link->open)
384 		netif_device_detach(dev);
385 
386 	return 0;
387 }
388 
389 static int axnet_resume(struct pcmcia_device *link)
390 {
391 	struct net_device *dev = link->priv;
392 	struct axnet_dev *info = PRIV(dev);
393 
394 	if (link->open) {
395 		if (info->active_low == 1)
396 			pcmcia_write_config_byte(link, CISREG_CCSR, 0x04);
397 
398 		axnet_reset_8390(dev);
399 		AX88190_init(dev, 1);
400 		netif_device_attach(dev);
401 	}
402 
403 	return 0;
404 }
405 
406 
407 /*======================================================================
408 
409     MII interface support
410 
411 ======================================================================*/
412 
413 #define MDIO_SHIFT_CLK		0x01
414 #define MDIO_DATA_WRITE0	0x00
415 #define MDIO_DATA_WRITE1	0x08
416 #define MDIO_DATA_READ		0x04
417 #define MDIO_MASK		0x0f
418 #define MDIO_ENB_IN		0x02
419 
420 static void mdio_sync(unsigned int addr)
421 {
422     int bits;
423     for (bits = 0; bits < 32; bits++) {
424 	outb_p(MDIO_DATA_WRITE1, addr);
425 	outb_p(MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, addr);
426     }
427 }
428 
429 static int mdio_read(unsigned int addr, int phy_id, int loc)
430 {
431     u_int cmd = (0xf6<<10)|(phy_id<<5)|loc;
432     int i, retval = 0;
433 
434     mdio_sync(addr);
435     for (i = 14; i >= 0; i--) {
436 	int dat = (cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
437 	outb_p(dat, addr);
438 	outb_p(dat | MDIO_SHIFT_CLK, addr);
439     }
440     for (i = 19; i > 0; i--) {
441 	outb_p(MDIO_ENB_IN, addr);
442 	retval = (retval << 1) | ((inb_p(addr) & MDIO_DATA_READ) != 0);
443 	outb_p(MDIO_ENB_IN | MDIO_SHIFT_CLK, addr);
444     }
445     return (retval>>1) & 0xffff;
446 }
447 
448 static void mdio_write(unsigned int addr, int phy_id, int loc, int value)
449 {
450     u_int cmd = (0x05<<28)|(phy_id<<23)|(loc<<18)|(1<<17)|value;
451     int i;
452 
453     mdio_sync(addr);
454     for (i = 31; i >= 0; i--) {
455 	int dat = (cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
456 	outb_p(dat, addr);
457 	outb_p(dat | MDIO_SHIFT_CLK, addr);
458     }
459     for (i = 1; i >= 0; i--) {
460 	outb_p(MDIO_ENB_IN, addr);
461 	outb_p(MDIO_ENB_IN | MDIO_SHIFT_CLK, addr);
462     }
463 }
464 
465 /*====================================================================*/
466 
467 static int axnet_open(struct net_device *dev)
468 {
469     int ret;
470     struct axnet_dev *info = PRIV(dev);
471     struct pcmcia_device *link = info->p_dev;
472     unsigned int nic_base = dev->base_addr;
473 
474     dev_dbg(&link->dev, "axnet_open('%s')\n", dev->name);
475 
476     if (!pcmcia_dev_present(link))
477 	return -ENODEV;
478 
479     outb_p(0xFF, nic_base + EN0_ISR); /* Clear bogus intr. */
480     ret = request_irq(dev->irq, ei_irq_wrapper, IRQF_SHARED, "axnet_cs", dev);
481     if (ret)
482 	    return ret;
483 
484     link->open++;
485 
486     info->link_status = 0x00;
487     setup_timer(&info->watchdog, ei_watchdog, (u_long)dev);
488     mod_timer(&info->watchdog, jiffies + HZ);
489 
490     return ax_open(dev);
491 } /* axnet_open */
492 
493 /*====================================================================*/
494 
495 static int axnet_close(struct net_device *dev)
496 {
497     struct axnet_dev *info = PRIV(dev);
498     struct pcmcia_device *link = info->p_dev;
499 
500     dev_dbg(&link->dev, "axnet_close('%s')\n", dev->name);
501 
502     ax_close(dev);
503     free_irq(dev->irq, dev);
504 
505     link->open--;
506     netif_stop_queue(dev);
507     del_timer_sync(&info->watchdog);
508 
509     return 0;
510 } /* axnet_close */
511 
512 /*======================================================================
513 
514     Hard reset the card.  This used to pause for the same period that
515     a 8390 reset command required, but that shouldn't be necessary.
516 
517 ======================================================================*/
518 
519 static void axnet_reset_8390(struct net_device *dev)
520 {
521     unsigned int nic_base = dev->base_addr;
522     int i;
523 
524     ei_status.txing = ei_status.dmaing = 0;
525 
526     outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, nic_base + E8390_CMD);
527 
528     outb(inb(nic_base + AXNET_RESET), nic_base + AXNET_RESET);
529 
530     for (i = 0; i < 100; i++) {
531 	if ((inb_p(nic_base+EN0_ISR) & ENISR_RESET) != 0)
532 	    break;
533 	udelay(100);
534     }
535     outb_p(ENISR_RESET, nic_base + EN0_ISR); /* Ack intr. */
536 
537     if (i == 100)
538 	netdev_err(dev, "axnet_reset_8390() did not complete\n");
539 
540 } /* axnet_reset_8390 */
541 
542 /*====================================================================*/
543 
544 static irqreturn_t ei_irq_wrapper(int irq, void *dev_id)
545 {
546     struct net_device *dev = dev_id;
547     PRIV(dev)->stale = 0;
548     return ax_interrupt(irq, dev_id);
549 }
550 
551 static void ei_watchdog(u_long arg)
552 {
553     struct net_device *dev = (struct net_device *)(arg);
554     struct axnet_dev *info = PRIV(dev);
555     unsigned int nic_base = dev->base_addr;
556     unsigned int mii_addr = nic_base + AXNET_MII_EEP;
557     u_short link;
558 
559     if (!netif_device_present(dev)) goto reschedule;
560 
561     /* Check for pending interrupt with expired latency timer: with
562        this, we can limp along even if the interrupt is blocked */
563     if (info->stale++ && (inb_p(nic_base + EN0_ISR) & ENISR_ALL)) {
564 	if (!info->fast_poll)
565 	    netdev_info(dev, "interrupt(s) dropped!\n");
566 	ei_irq_wrapper(dev->irq, dev);
567 	info->fast_poll = HZ;
568     }
569     if (info->fast_poll) {
570 	info->fast_poll--;
571 	info->watchdog.expires = jiffies + 1;
572 	add_timer(&info->watchdog);
573 	return;
574     }
575 
576     if (info->phy_id < 0)
577 	goto reschedule;
578     link = mdio_read(mii_addr, info->phy_id, 1);
579     if (!link || (link == 0xffff)) {
580 	netdev_info(dev, "MII is missing!\n");
581 	info->phy_id = -1;
582 	goto reschedule;
583     }
584 
585     link &= 0x0004;
586     if (link != info->link_status) {
587 	u_short p = mdio_read(mii_addr, info->phy_id, 5);
588 	netdev_info(dev, "%s link beat\n", link ? "found" : "lost");
589 	if (link) {
590 	    info->duplex_flag = (p & 0x0140) ? 0x80 : 0x00;
591 	    if (p)
592 		netdev_info(dev, "autonegotiation complete: %dbaseT-%cD selected\n",
593 			    (p & 0x0180) ? 100 : 10, (p & 0x0140) ? 'F' : 'H');
594 	    else
595 		netdev_info(dev, "link partner did not autonegotiate\n");
596 	    AX88190_init(dev, 1);
597 	}
598 	info->link_status = link;
599     }
600 
601 reschedule:
602     info->watchdog.expires = jiffies + HZ;
603     add_timer(&info->watchdog);
604 }
605 
606 /*====================================================================*/
607 
608 static int axnet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
609 {
610     struct axnet_dev *info = PRIV(dev);
611     struct mii_ioctl_data *data = if_mii(rq);
612     unsigned int mii_addr = dev->base_addr + AXNET_MII_EEP;
613     switch (cmd) {
614     case SIOCGMIIPHY:
615 	data->phy_id = info->phy_id;
616     case SIOCGMIIREG:		/* Read MII PHY register. */
617 	data->val_out = mdio_read(mii_addr, data->phy_id, data->reg_num & 0x1f);
618 	return 0;
619     case SIOCSMIIREG:		/* Write MII PHY register. */
620 	mdio_write(mii_addr, data->phy_id, data->reg_num & 0x1f, data->val_in);
621 	return 0;
622     }
623     return -EOPNOTSUPP;
624 }
625 
626 /*====================================================================*/
627 
628 static void get_8390_hdr(struct net_device *dev,
629 			 struct e8390_pkt_hdr *hdr,
630 			 int ring_page)
631 {
632     unsigned int nic_base = dev->base_addr;
633 
634     outb_p(0, nic_base + EN0_RSARLO);		/* On page boundary */
635     outb_p(ring_page, nic_base + EN0_RSARHI);
636     outb_p(E8390_RREAD+E8390_START, nic_base + AXNET_CMD);
637 
638     insw(nic_base + AXNET_DATAPORT, hdr,
639 	    sizeof(struct e8390_pkt_hdr)>>1);
640     /* Fix for big endian systems */
641     hdr->count = le16_to_cpu(hdr->count);
642 
643 }
644 
645 /*====================================================================*/
646 
647 static void block_input(struct net_device *dev, int count,
648 			struct sk_buff *skb, int ring_offset)
649 {
650     unsigned int nic_base = dev->base_addr;
651     struct ei_device *ei_local = netdev_priv(dev);
652     int xfer_count = count;
653     char *buf = skb->data;
654 
655     if ((netif_msg_rx_status(ei_local)) && (count != 4))
656 	netdev_dbg(dev, "[bi=%d]\n", count+4);
657     outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
658     outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
659     outb_p(E8390_RREAD+E8390_START, nic_base + AXNET_CMD);
660 
661     insw(nic_base + AXNET_DATAPORT,buf,count>>1);
662     if (count & 0x01)
663 	buf[count-1] = inb(nic_base + AXNET_DATAPORT), xfer_count++;
664 
665 }
666 
667 /*====================================================================*/
668 
669 static void block_output(struct net_device *dev, int count,
670 			 const u_char *buf, const int start_page)
671 {
672     unsigned int nic_base = dev->base_addr;
673 
674     pr_debug("%s: [bo=%d]\n", dev->name, count);
675 
676     /* Round the count up for word writes.  Do we need to do this?
677        What effect will an odd byte count have on the 8390?
678        I should check someday. */
679     if (count & 0x01)
680 	count++;
681 
682     outb_p(0x00, nic_base + EN0_RSARLO);
683     outb_p(start_page, nic_base + EN0_RSARHI);
684     outb_p(E8390_RWRITE+E8390_START, nic_base + AXNET_CMD);
685     outsw(nic_base + AXNET_DATAPORT, buf, count>>1);
686 }
687 
688 static const struct pcmcia_device_id axnet_ids[] = {
689 	PCMCIA_PFC_DEVICE_MANF_CARD(0, 0x016c, 0x0081),
690 	PCMCIA_DEVICE_MANF_CARD(0x018a, 0x0301),
691 	PCMCIA_DEVICE_MANF_CARD(0x01bf, 0x2328),
692 	PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0301),
693 	PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0303),
694 	PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0309),
695 	PCMCIA_DEVICE_MANF_CARD(0x0274, 0x1106),
696 	PCMCIA_DEVICE_MANF_CARD(0x8a01, 0xc1ab),
697 	PCMCIA_DEVICE_MANF_CARD(0x021b, 0x0202),
698 	PCMCIA_DEVICE_MANF_CARD(0xffff, 0x1090),
699 	PCMCIA_DEVICE_PROD_ID12("AmbiCom,Inc.", "Fast Ethernet PC Card(AMB8110)", 0x49b020a7, 0x119cc9fc),
700 	PCMCIA_DEVICE_PROD_ID124("Fast Ethernet", "16-bit PC Card", "AX88190", 0xb4be14e3, 0x9a12eb6a, 0xab9be5ef),
701 	PCMCIA_DEVICE_PROD_ID12("ASIX", "AX88190", 0x0959823b, 0xab9be5ef),
702 	PCMCIA_DEVICE_PROD_ID12("Billionton", "LNA-100B", 0x552ab682, 0xbc3b87e1),
703 	PCMCIA_DEVICE_PROD_ID12("CHEETAH ETHERCARD", "EN2228", 0x00fa7bc8, 0x00e990cc),
704 	PCMCIA_DEVICE_PROD_ID12("CNet", "CNF301", 0xbc477dde, 0x78c5f40b),
705 	PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEther PCC-TXD", 0x5261440f, 0x436768c5),
706 	PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEtherII PCC-TXD", 0x5261440f, 0x730df72e),
707 	PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEther PCC-TXM", 0x5261440f, 0x3abbd061),
708 	PCMCIA_DEVICE_PROD_ID12("Dynalink", "L100C16", 0x55632fd5, 0x66bc2a90),
709 	PCMCIA_DEVICE_PROD_ID12("IO DATA", "ETXPCM", 0x547e66dc, 0x233adac2),
710 	PCMCIA_DEVICE_PROD_ID12("Linksys", "EtherFast 10/100 PC Card (PCMPC100 V3)", 0x0733cc81, 0x232019a8),
711 	PCMCIA_DEVICE_PROD_ID12("MELCO", "LPC3-TX", 0x481e0094, 0xf91af609),
712 	PCMCIA_DEVICE_PROD_ID12("NETGEAR", "FA411", 0x9aa79dc3, 0x40fad875),
713 	PCMCIA_DEVICE_PROD_ID12("PCMCIA", "100BASE", 0x281f1c5d, 0x7c2add04),
714 	PCMCIA_DEVICE_PROD_ID12("PCMCIA", "FastEtherCard", 0x281f1c5d, 0x7ef26116),
715 	PCMCIA_DEVICE_PROD_ID12("PCMCIA", "FEP501", 0x281f1c5d, 0x2e272058),
716 	PCMCIA_DEVICE_PROD_ID14("Network Everywhere", "AX88190", 0x820a67b6,  0xab9be5ef),
717 	PCMCIA_DEVICE_NULL,
718 };
719 MODULE_DEVICE_TABLE(pcmcia, axnet_ids);
720 
721 static struct pcmcia_driver axnet_cs_driver = {
722 	.owner		= THIS_MODULE,
723 	.name		= "axnet_cs",
724 	.probe		= axnet_probe,
725 	.remove		= axnet_detach,
726 	.id_table       = axnet_ids,
727 	.suspend	= axnet_suspend,
728 	.resume		= axnet_resume,
729 };
730 module_pcmcia_driver(axnet_cs_driver);
731 
732 /*====================================================================*/
733 
734 /* 8390.c: A general NS8390 ethernet driver core for linux. */
735 /*
736 	Written 1992-94 by Donald Becker.
737 
738 	Copyright 1993 United States Government as represented by the
739 	Director, National Security Agency.
740 
741 	This software may be used and distributed according to the terms
742 	of the GNU General Public License, incorporated herein by reference.
743 
744 	The author may be reached as becker@scyld.com, or C/O
745 	Scyld Computing Corporation
746 	410 Severn Ave., Suite 210
747 	Annapolis MD 21403
748 
749   This is the chip-specific code for many 8390-based ethernet adaptors.
750   This is not a complete driver, it must be combined with board-specific
751   code such as ne.c, wd.c, 3c503.c, etc.
752 
753   Seeing how at least eight drivers use this code, (not counting the
754   PCMCIA ones either) it is easy to break some card by what seems like
755   a simple innocent change. Please contact me or Donald if you think
756   you have found something that needs changing. -- PG
757 
758   Changelog:
759 
760   Paul Gortmaker	: remove set_bit lock, other cleanups.
761   Paul Gortmaker	: add ei_get_8390_hdr() so we can pass skb's to
762 			  ei_block_input() for eth_io_copy_and_sum().
763   Paul Gortmaker	: exchange static int ei_pingpong for a #define,
764 			  also add better Tx error handling.
765   Paul Gortmaker	: rewrite Rx overrun handling as per NS specs.
766   Alexey Kuznetsov	: use the 8390's six bit hash multicast filter.
767   Paul Gortmaker	: tweak ANK's above multicast changes a bit.
768   Paul Gortmaker	: update packet statistics for v2.1.x
769   Alan Cox		: support arbitrary stupid port mappings on the
770   			  68K Macintosh. Support >16bit I/O spaces
771   Paul Gortmaker	: add kmod support for auto-loading of the 8390
772 			  module by all drivers that require it.
773   Alan Cox		: Spinlocking work, added 'BUG_83C690'
774   Paul Gortmaker	: Separate out Tx timeout code from Tx path.
775 
776   Sources:
777   The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
778 
779   */
780 
781 #include <linux/bitops.h>
782 #include <asm/irq.h>
783 #include <linux/fcntl.h>
784 #include <linux/in.h>
785 #include <linux/interrupt.h>
786 
787 #define BUG_83C690
788 
789 /* These are the operational function interfaces to board-specific
790    routines.
791 	void reset_8390(struct net_device *dev)
792 		Resets the board associated with DEV, including a hardware reset of
793 		the 8390.  This is only called when there is a transmit timeout, and
794 		it is always followed by 8390_init().
795 	void block_output(struct net_device *dev, int count, const unsigned char *buf,
796 					  int start_page)
797 		Write the COUNT bytes of BUF to the packet buffer at START_PAGE.  The
798 		"page" value uses the 8390's 256-byte pages.
799 	void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page)
800 		Read the 4 byte, page aligned 8390 header. *If* there is a
801 		subsequent read, it will be of the rest of the packet.
802 	void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
803 		Read COUNT bytes from the packet buffer into the skb data area. Start
804 		reading from RING_OFFSET, the address as the 8390 sees it.  This will always
805 		follow the read of the 8390 header.
806 */
807 #define ei_reset_8390 (ei_local->reset_8390)
808 #define ei_block_output (ei_local->block_output)
809 #define ei_block_input (ei_local->block_input)
810 #define ei_get_8390_hdr (ei_local->get_8390_hdr)
811 
812 /* Index to functions. */
813 static void ei_tx_intr(struct net_device *dev);
814 static void ei_tx_err(struct net_device *dev);
815 static void ei_receive(struct net_device *dev);
816 static void ei_rx_overrun(struct net_device *dev);
817 
818 /* Routines generic to NS8390-based boards. */
819 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
820 								int start_page);
821 static void do_set_multicast_list(struct net_device *dev);
822 
823 /*
824  *	SMP and the 8390 setup.
825  *
826  *	The 8390 isn't exactly designed to be multithreaded on RX/TX. There is
827  *	a page register that controls bank and packet buffer access. We guard
828  *	this with ei_local->page_lock. Nobody should assume or set the page other
829  *	than zero when the lock is not held. Lock holders must restore page 0
830  *	before unlocking. Even pure readers must take the lock to protect in
831  *	page 0.
832  *
833  *	To make life difficult the chip can also be very slow. We therefore can't
834  *	just use spinlocks. For the longer lockups we disable the irq the device
835  *	sits on and hold the lock. We must hold the lock because there is a dual
836  *	processor case other than interrupts (get stats/set multicast list in
837  *	parallel with each other and transmit).
838  *
839  *	Note: in theory we can just disable the irq on the card _but_ there is
840  *	a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
841  *	enter lock, take the queued irq. So we waddle instead of flying.
842  *
843  *	Finally by special arrangement for the purpose of being generally
844  *	annoying the transmit function is called bh atomic. That places
845  *	restrictions on the user context callers as disable_irq won't save
846  *	them.
847  */
848 
849 /**
850  * ax_open - Open/initialize the board.
851  * @dev: network device to initialize
852  *
853  * This routine goes all-out, setting everything
854  * up anew at each open, even though many of these registers should only
855  * need to be set once at boot.
856  */
857 static int ax_open(struct net_device *dev)
858 {
859 	unsigned long flags;
860 	struct ei_device *ei_local = netdev_priv(dev);
861 
862 	/*
863 	 *	Grab the page lock so we own the register set, then call
864 	 *	the init function.
865 	 */
866 
867       	spin_lock_irqsave(&ei_local->page_lock, flags);
868 	AX88190_init(dev, 1);
869 	/* Set the flag before we drop the lock, That way the IRQ arrives
870 	   after its set and we get no silly warnings */
871 	netif_start_queue(dev);
872       	spin_unlock_irqrestore(&ei_local->page_lock, flags);
873 	ei_local->irqlock = 0;
874 	return 0;
875 }
876 
877 #define dev_lock(dev) (((struct ei_device *)netdev_priv(dev))->page_lock)
878 
879 /**
880  * ax_close - shut down network device
881  * @dev: network device to close
882  *
883  * Opposite of ax_open(). Only used when "ifconfig <devname> down" is done.
884  */
885 static int ax_close(struct net_device *dev)
886 {
887 	unsigned long flags;
888 
889 	/*
890 	 *      Hold the page lock during close
891 	 */
892 
893 	spin_lock_irqsave(&dev_lock(dev), flags);
894 	AX88190_init(dev, 0);
895 	spin_unlock_irqrestore(&dev_lock(dev), flags);
896 	netif_stop_queue(dev);
897 	return 0;
898 }
899 
900 /**
901  * axnet_tx_timeout - handle transmit time out condition
902  * @dev: network device which has apparently fallen asleep
903  *
904  * Called by kernel when device never acknowledges a transmit has
905  * completed (or failed) - i.e. never posted a Tx related interrupt.
906  */
907 
908 static void axnet_tx_timeout(struct net_device *dev)
909 {
910 	long e8390_base = dev->base_addr;
911 	struct ei_device *ei_local = netdev_priv(dev);
912 	int txsr, isr, tickssofar = jiffies - dev_trans_start(dev);
913 	unsigned long flags;
914 
915 	dev->stats.tx_errors++;
916 
917 	spin_lock_irqsave(&ei_local->page_lock, flags);
918 	txsr = inb(e8390_base+EN0_TSR);
919 	isr = inb(e8390_base+EN0_ISR);
920 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
921 
922 	netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
923 		   (txsr & ENTSR_ABT) ? "excess collisions." :
924 		   (isr) ? "lost interrupt?" : "cable problem?",
925 		   txsr, isr, tickssofar);
926 
927 	if (!isr && !dev->stats.tx_packets)
928 	{
929 		/* The 8390 probably hasn't gotten on the cable yet. */
930 		ei_local->interface_num ^= 1;   /* Try a different xcvr.  */
931 	}
932 
933 	/* Ugly but a reset can be slow, yet must be protected */
934 
935 	spin_lock_irqsave(&ei_local->page_lock, flags);
936 
937 	/* Try to restart the card.  Perhaps the user has fixed something. */
938 	ei_reset_8390(dev);
939 	AX88190_init(dev, 1);
940 
941 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
942 	netif_wake_queue(dev);
943 }
944 
945 /**
946  * axnet_start_xmit - begin packet transmission
947  * @skb: packet to be sent
948  * @dev: network device to which packet is sent
949  *
950  * Sends a packet to an 8390 network device.
951  */
952 
953 static netdev_tx_t axnet_start_xmit(struct sk_buff *skb,
954 					  struct net_device *dev)
955 {
956 	long e8390_base = dev->base_addr;
957 	struct ei_device *ei_local = netdev_priv(dev);
958 	int length, send_length, output_page;
959 	unsigned long flags;
960 	u8 packet[ETH_ZLEN];
961 
962 	netif_stop_queue(dev);
963 
964 	length = skb->len;
965 
966 	/* Mask interrupts from the ethercard.
967 	   SMP: We have to grab the lock here otherwise the IRQ handler
968 	   on another CPU can flip window and race the IRQ mask set. We end
969 	   up trashing the mcast filter not disabling irqs if we don't lock */
970 
971 	spin_lock_irqsave(&ei_local->page_lock, flags);
972 	outb_p(0x00, e8390_base + EN0_IMR);
973 
974 	/*
975 	 *	Slow phase with lock held.
976 	 */
977 
978 	ei_local->irqlock = 1;
979 
980 	send_length = max(length, ETH_ZLEN);
981 
982 	/*
983 	 * We have two Tx slots available for use. Find the first free
984 	 * slot, and then perform some sanity checks. With two Tx bufs,
985 	 * you get very close to transmitting back-to-back packets. With
986 	 * only one Tx buf, the transmitter sits idle while you reload the
987 	 * card, leaving a substantial gap between each transmitted packet.
988 	 */
989 
990 	if (ei_local->tx1 == 0)
991 	{
992 		output_page = ei_local->tx_start_page;
993 		ei_local->tx1 = send_length;
994 		if ((netif_msg_tx_queued(ei_local)) &&
995 		    ei_local->tx2 > 0)
996 			netdev_dbg(dev,
997 				   "idle transmitter tx2=%d, lasttx=%d, txing=%d\n",
998 				   ei_local->tx2, ei_local->lasttx,
999 				   ei_local->txing);
1000 	}
1001 	else if (ei_local->tx2 == 0)
1002 	{
1003 		output_page = ei_local->tx_start_page + TX_PAGES/2;
1004 		ei_local->tx2 = send_length;
1005 		if ((netif_msg_tx_queued(ei_local)) &&
1006 		    ei_local->tx1 > 0)
1007 			netdev_dbg(dev,
1008 				   "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n",
1009 				   ei_local->tx1, ei_local->lasttx,
1010 				   ei_local->txing);
1011 	}
1012 	else
1013 	{	/* We should never get here. */
1014 		netif_dbg(ei_local, tx_err, dev,
1015 			  "No Tx buffers free! tx1=%d tx2=%d last=%d\n",
1016 			  ei_local->tx1, ei_local->tx2,
1017 			  ei_local->lasttx);
1018 		ei_local->irqlock = 0;
1019 		netif_stop_queue(dev);
1020 		outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1021 		spin_unlock_irqrestore(&ei_local->page_lock, flags);
1022 		dev->stats.tx_errors++;
1023 		return NETDEV_TX_BUSY;
1024 	}
1025 
1026 	/*
1027 	 * Okay, now upload the packet and trigger a send if the transmitter
1028 	 * isn't already sending. If it is busy, the interrupt handler will
1029 	 * trigger the send later, upon receiving a Tx done interrupt.
1030 	 */
1031 
1032 	if (length == skb->len)
1033 		ei_block_output(dev, length, skb->data, output_page);
1034 	else {
1035 		memset(packet, 0, ETH_ZLEN);
1036 		skb_copy_from_linear_data(skb, packet, skb->len);
1037 		ei_block_output(dev, length, packet, output_page);
1038 	}
1039 
1040 	if (! ei_local->txing)
1041 	{
1042 		ei_local->txing = 1;
1043 		NS8390_trigger_send(dev, send_length, output_page);
1044 		dev->trans_start = jiffies;
1045 		if (output_page == ei_local->tx_start_page)
1046 		{
1047 			ei_local->tx1 = -1;
1048 			ei_local->lasttx = -1;
1049 		}
1050 		else
1051 		{
1052 			ei_local->tx2 = -1;
1053 			ei_local->lasttx = -2;
1054 		}
1055 	}
1056 	else ei_local->txqueue++;
1057 
1058 	if (ei_local->tx1  &&  ei_local->tx2)
1059 		netif_stop_queue(dev);
1060 	else
1061 		netif_start_queue(dev);
1062 
1063 	/* Turn 8390 interrupts back on. */
1064 	ei_local->irqlock = 0;
1065 	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1066 
1067 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
1068 
1069 	dev_kfree_skb (skb);
1070 	dev->stats.tx_bytes += send_length;
1071 
1072 	return NETDEV_TX_OK;
1073 }
1074 
1075 /**
1076  * ax_interrupt - handle the interrupts from an 8390
1077  * @irq: interrupt number
1078  * @dev_id: a pointer to the net_device
1079  *
1080  * Handle the ether interface interrupts. We pull packets from
1081  * the 8390 via the card specific functions and fire them at the networking
1082  * stack. We also handle transmit completions and wake the transmit path if
1083  * necessary. We also update the counters and do other housekeeping as
1084  * needed.
1085  */
1086 
1087 static irqreturn_t ax_interrupt(int irq, void *dev_id)
1088 {
1089 	struct net_device *dev = dev_id;
1090 	long e8390_base;
1091 	int interrupts, nr_serviced = 0, i;
1092 	struct ei_device *ei_local;
1093     	int handled = 0;
1094 	unsigned long flags;
1095 
1096 	e8390_base = dev->base_addr;
1097 	ei_local = netdev_priv(dev);
1098 
1099 	/*
1100 	 *	Protect the irq test too.
1101 	 */
1102 
1103 	spin_lock_irqsave(&ei_local->page_lock, flags);
1104 
1105 	if (ei_local->irqlock) {
1106 #if 1 /* This might just be an interrupt for a PCI device sharing this line */
1107 		const char *msg;
1108 		/* The "irqlock" check is only for testing. */
1109 		if (ei_local->irqlock)
1110 			msg = "Interrupted while interrupts are masked!";
1111 		else
1112 			msg = "Reentering the interrupt handler!";
1113 		netdev_info(dev, "%s, isr=%#2x imr=%#2x\n",
1114 			    msg,
1115 			    inb_p(e8390_base + EN0_ISR),
1116 			    inb_p(e8390_base + EN0_IMR));
1117 #endif
1118 		spin_unlock_irqrestore(&ei_local->page_lock, flags);
1119 		return IRQ_NONE;
1120 	}
1121 
1122 	netif_dbg(ei_local, intr, dev, "interrupt(isr=%#2.2x)\n",
1123 		  inb_p(e8390_base + EN0_ISR));
1124 
1125 	outb_p(0x00, e8390_base + EN0_ISR);
1126 	ei_local->irqlock = 1;
1127 
1128 	/* !!Assumption!! -- we stay in page 0.	 Don't break this. */
1129 	while ((interrupts = inb_p(e8390_base + EN0_ISR)) != 0 &&
1130 	       ++nr_serviced < MAX_SERVICE)
1131 	{
1132 		if (!netif_running(dev) || (interrupts == 0xff)) {
1133 			netif_warn(ei_local, intr, dev,
1134 				   "interrupt from stopped card\n");
1135 			outb_p(interrupts, e8390_base + EN0_ISR);
1136 			interrupts = 0;
1137 			break;
1138 		}
1139 		handled = 1;
1140 
1141 		/* AX88190 bug fix. */
1142 		outb_p(interrupts, e8390_base + EN0_ISR);
1143 		for (i = 0; i < 10; i++) {
1144 			if (!(inb(e8390_base + EN0_ISR) & interrupts))
1145 				break;
1146 			outb_p(0, e8390_base + EN0_ISR);
1147 			outb_p(interrupts, e8390_base + EN0_ISR);
1148 		}
1149 		if (interrupts & ENISR_OVER)
1150 			ei_rx_overrun(dev);
1151 		else if (interrupts & (ENISR_RX+ENISR_RX_ERR))
1152 		{
1153 			/* Got a good (?) packet. */
1154 			ei_receive(dev);
1155 		}
1156 		/* Push the next to-transmit packet through. */
1157 		if (interrupts & ENISR_TX)
1158 			ei_tx_intr(dev);
1159 		else if (interrupts & ENISR_TX_ERR)
1160 			ei_tx_err(dev);
1161 
1162 		if (interrupts & ENISR_COUNTERS)
1163 		{
1164 			dev->stats.rx_frame_errors += inb_p(e8390_base + EN0_COUNTER0);
1165 			dev->stats.rx_crc_errors   += inb_p(e8390_base + EN0_COUNTER1);
1166 			dev->stats.rx_missed_errors+= inb_p(e8390_base + EN0_COUNTER2);
1167 		}
1168 	}
1169 
1170 	if (interrupts && (netif_msg_intr(ei_local)))
1171 	{
1172 		handled = 1;
1173 		if (nr_serviced >= MAX_SERVICE)
1174 		{
1175 			/* 0xFF is valid for a card removal */
1176 			if (interrupts != 0xFF)
1177 				netdev_warn(dev,
1178 					    "Too much work at interrupt, status %#2.2x\n",
1179 					    interrupts);
1180 			outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
1181 		} else {
1182 			netdev_warn(dev, "unknown interrupt %#2x\n",
1183 				    interrupts);
1184 			outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
1185 		}
1186 	}
1187 
1188 	/* Turn 8390 interrupts back on. */
1189 	ei_local->irqlock = 0;
1190 	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1191 
1192 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
1193 	return IRQ_RETVAL(handled);
1194 }
1195 
1196 /**
1197  * ei_tx_err - handle transmitter error
1198  * @dev: network device which threw the exception
1199  *
1200  * A transmitter error has happened. Most likely excess collisions (which
1201  * is a fairly normal condition). If the error is one where the Tx will
1202  * have been aborted, we try and send another one right away, instead of
1203  * letting the failed packet sit and collect dust in the Tx buffer. This
1204  * is a much better solution as it avoids kernel based Tx timeouts, and
1205  * an unnecessary card reset.
1206  *
1207  * Called with lock held.
1208  */
1209 
1210 static void ei_tx_err(struct net_device *dev)
1211 {
1212 	long e8390_base = dev->base_addr;
1213 	unsigned char txsr = inb_p(e8390_base+EN0_TSR);
1214 	unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
1215 
1216 #ifdef VERBOSE_ERROR_DUMP
1217 	netdev_dbg(dev, "transmitter error (%#2x):", txsr);
1218 	if (txsr & ENTSR_ABT)
1219 		pr_cont(" excess-collisions");
1220 	if (txsr & ENTSR_ND)
1221 		pr_cont(" non-deferral");
1222 	if (txsr & ENTSR_CRS)
1223 		pr_cont(" lost-carrier");
1224 	if (txsr & ENTSR_FU)
1225 		pr_cont(" FIFO-underrun");
1226 	if (txsr & ENTSR_CDH)
1227 		pr_cont(" lost-heartbeat");
1228 	pr_cont("\n");
1229 #endif
1230 
1231 	if (tx_was_aborted)
1232 		ei_tx_intr(dev);
1233 	else
1234 	{
1235 		dev->stats.tx_errors++;
1236 		if (txsr & ENTSR_CRS) dev->stats.tx_carrier_errors++;
1237 		if (txsr & ENTSR_CDH) dev->stats.tx_heartbeat_errors++;
1238 		if (txsr & ENTSR_OWC) dev->stats.tx_window_errors++;
1239 	}
1240 }
1241 
1242 /**
1243  * ei_tx_intr - transmit interrupt handler
1244  * @dev: network device for which tx intr is handled
1245  *
1246  * We have finished a transmit: check for errors and then trigger the next
1247  * packet to be sent. Called with lock held.
1248  */
1249 
1250 static void ei_tx_intr(struct net_device *dev)
1251 {
1252 	long e8390_base = dev->base_addr;
1253 	struct ei_device *ei_local = netdev_priv(dev);
1254 	int status = inb(e8390_base + EN0_TSR);
1255 
1256 	/*
1257 	 * There are two Tx buffers, see which one finished, and trigger
1258 	 * the send of another one if it exists.
1259 	 */
1260 	ei_local->txqueue--;
1261 
1262 	if (ei_local->tx1 < 0)
1263 	{
1264 		if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
1265 			netdev_err(dev, "%s: bogus last_tx_buffer %d, tx1=%d\n",
1266 				   ei_local->name, ei_local->lasttx,
1267 				   ei_local->tx1);
1268 		ei_local->tx1 = 0;
1269 		if (ei_local->tx2 > 0)
1270 		{
1271 			ei_local->txing = 1;
1272 			NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
1273 			dev->trans_start = jiffies;
1274 			ei_local->tx2 = -1,
1275 			ei_local->lasttx = 2;
1276 		}
1277 		else ei_local->lasttx = 20, ei_local->txing = 0;
1278 	}
1279 	else if (ei_local->tx2 < 0)
1280 	{
1281 		if (ei_local->lasttx != 2  &&  ei_local->lasttx != -2)
1282 			netdev_err(dev, "%s: bogus last_tx_buffer %d, tx2=%d\n",
1283 				   ei_local->name, ei_local->lasttx,
1284 				   ei_local->tx2);
1285 		ei_local->tx2 = 0;
1286 		if (ei_local->tx1 > 0)
1287 		{
1288 			ei_local->txing = 1;
1289 			NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
1290 			dev->trans_start = jiffies;
1291 			ei_local->tx1 = -1;
1292 			ei_local->lasttx = 1;
1293 		}
1294 		else
1295 			ei_local->lasttx = 10, ei_local->txing = 0;
1296 	}
1297 //	else
1298 //		netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n",
1299 //			    ei_local->lasttx);
1300 
1301 	/* Minimize Tx latency: update the statistics after we restart TXing. */
1302 	if (status & ENTSR_COL)
1303 		dev->stats.collisions++;
1304 	if (status & ENTSR_PTX)
1305 		dev->stats.tx_packets++;
1306 	else
1307 	{
1308 		dev->stats.tx_errors++;
1309 		if (status & ENTSR_ABT)
1310 		{
1311 			dev->stats.tx_aborted_errors++;
1312 			dev->stats.collisions += 16;
1313 		}
1314 		if (status & ENTSR_CRS)
1315 			dev->stats.tx_carrier_errors++;
1316 		if (status & ENTSR_FU)
1317 			dev->stats.tx_fifo_errors++;
1318 		if (status & ENTSR_CDH)
1319 			dev->stats.tx_heartbeat_errors++;
1320 		if (status & ENTSR_OWC)
1321 			dev->stats.tx_window_errors++;
1322 	}
1323 	netif_wake_queue(dev);
1324 }
1325 
1326 /**
1327  * ei_receive - receive some packets
1328  * @dev: network device with which receive will be run
1329  *
1330  * We have a good packet(s), get it/them out of the buffers.
1331  * Called with lock held.
1332  */
1333 
1334 static void ei_receive(struct net_device *dev)
1335 {
1336 	long e8390_base = dev->base_addr;
1337 	struct ei_device *ei_local = netdev_priv(dev);
1338 	unsigned char rxing_page, this_frame, next_frame;
1339 	unsigned short current_offset;
1340 	int rx_pkt_count = 0;
1341 	struct e8390_pkt_hdr rx_frame;
1342 
1343 	while (++rx_pkt_count < 10)
1344 	{
1345 		int pkt_len, pkt_stat;
1346 
1347 		/* Get the rx page (incoming packet pointer). */
1348 		rxing_page = inb_p(e8390_base + EN1_CURPAG -1);
1349 
1350 		/* Remove one frame from the ring.  Boundary is always a page behind. */
1351 		this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1;
1352 		if (this_frame >= ei_local->stop_page)
1353 			this_frame = ei_local->rx_start_page;
1354 
1355 		/* Someday we'll omit the previous, iff we never get this message.
1356 		   (There is at least one clone claimed to have a problem.)
1357 
1358 		   Keep quiet if it looks like a card removal. One problem here
1359 		   is that some clones crash in roughly the same way.
1360 		 */
1361 		if ((netif_msg_rx_err(ei_local)) &&
1362 		    this_frame != ei_local->current_page &&
1363 		    (this_frame != 0x0 || rxing_page != 0xFF))
1364 			netdev_err(dev, "mismatched read page pointers %2x vs %2x\n",
1365 				   this_frame, ei_local->current_page);
1366 
1367 		if (this_frame == rxing_page)	/* Read all the frames? */
1368 			break;				/* Done for now */
1369 
1370 		current_offset = this_frame << 8;
1371 		ei_get_8390_hdr(dev, &rx_frame, this_frame);
1372 
1373 		pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
1374 		pkt_stat = rx_frame.status;
1375 
1376 		next_frame = this_frame + 1 + ((pkt_len+4)>>8);
1377 
1378 		if (pkt_len < 60  ||  pkt_len > 1518)
1379 		{
1380 			netif_err(ei_local, rx_err, dev,
1381 				  "bogus packet size: %d, status=%#2x nxpg=%#2x\n",
1382 				  rx_frame.count, rx_frame.status,
1383 				  rx_frame.next);
1384 			dev->stats.rx_errors++;
1385 			dev->stats.rx_length_errors++;
1386 		}
1387 		 else if ((pkt_stat & 0x0F) == ENRSR_RXOK)
1388 		{
1389 			struct sk_buff *skb;
1390 
1391 			skb = netdev_alloc_skb(dev, pkt_len + 2);
1392 			if (skb == NULL)
1393 			{
1394 				netif_err(ei_local, rx_err, dev,
1395 					  "Couldn't allocate a sk_buff of size %d\n",
1396 					  pkt_len);
1397 				dev->stats.rx_dropped++;
1398 				break;
1399 			}
1400 			else
1401 			{
1402 				skb_reserve(skb,2);	/* IP headers on 16 byte boundaries */
1403 				skb_put(skb, pkt_len);	/* Make room */
1404 				ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
1405 				skb->protocol=eth_type_trans(skb,dev);
1406 				netif_rx(skb);
1407 				dev->stats.rx_packets++;
1408 				dev->stats.rx_bytes += pkt_len;
1409 				if (pkt_stat & ENRSR_PHY)
1410 					dev->stats.multicast++;
1411 			}
1412 		}
1413 		else
1414 		{
1415 			netif_err(ei_local, rx_err, dev,
1416 				  "bogus packet: status=%#2x nxpg=%#2x size=%d\n",
1417 				  rx_frame.status, rx_frame.next,
1418 				  rx_frame.count);
1419 			dev->stats.rx_errors++;
1420 			/* NB: The NIC counts CRC, frame and missed errors. */
1421 			if (pkt_stat & ENRSR_FO)
1422 				dev->stats.rx_fifo_errors++;
1423 		}
1424 		next_frame = rx_frame.next;
1425 
1426 		/* This _should_ never happen: it's here for avoiding bad clones. */
1427 		if (next_frame >= ei_local->stop_page) {
1428 			netdev_info(dev, "next frame inconsistency, %#2x\n",
1429 				    next_frame);
1430 			next_frame = ei_local->rx_start_page;
1431 		}
1432 		ei_local->current_page = next_frame;
1433 		outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
1434 	}
1435 }
1436 
1437 /**
1438  * ei_rx_overrun - handle receiver overrun
1439  * @dev: network device which threw exception
1440  *
1441  * We have a receiver overrun: we have to kick the 8390 to get it started
1442  * again. Problem is that you have to kick it exactly as NS prescribes in
1443  * the updated datasheets, or "the NIC may act in an unpredictable manner."
1444  * This includes causing "the NIC to defer indefinitely when it is stopped
1445  * on a busy network."  Ugh.
1446  * Called with lock held. Don't call this with the interrupts off or your
1447  * computer will hate you - it takes 10ms or so.
1448  */
1449 
1450 static void ei_rx_overrun(struct net_device *dev)
1451 {
1452 	struct axnet_dev *info = PRIV(dev);
1453 	long e8390_base = dev->base_addr;
1454 	unsigned char was_txing, must_resend = 0;
1455 	struct ei_device *ei_local = netdev_priv(dev);
1456 
1457 	/*
1458 	 * Record whether a Tx was in progress and then issue the
1459 	 * stop command.
1460 	 */
1461 	was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
1462 	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1463 
1464 	netif_dbg(ei_local, rx_err, dev, "Receiver overrun\n");
1465 	dev->stats.rx_over_errors++;
1466 
1467 	/*
1468 	 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
1469 	 * We wait at least 2ms.
1470 	 */
1471 
1472 	mdelay(2);
1473 
1474 	/*
1475 	 * Reset RBCR[01] back to zero as per magic incantation.
1476 	 */
1477 	outb_p(0x00, e8390_base+EN0_RCNTLO);
1478 	outb_p(0x00, e8390_base+EN0_RCNTHI);
1479 
1480 	/*
1481 	 * See if any Tx was interrupted or not. According to NS, this
1482 	 * step is vital, and skipping it will cause no end of havoc.
1483 	 */
1484 
1485 	if (was_txing)
1486 	{
1487 		unsigned char tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
1488 		if (!tx_completed)
1489 			must_resend = 1;
1490 	}
1491 
1492 	/*
1493 	 * Have to enter loopback mode and then restart the NIC before
1494 	 * you are allowed to slurp packets up off the ring.
1495 	 */
1496 	outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
1497 	outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
1498 
1499 	/*
1500 	 * Clear the Rx ring of all the debris, and ack the interrupt.
1501 	 */
1502 	ei_receive(dev);
1503 
1504 	/*
1505 	 * Leave loopback mode, and resend any packet that got stopped.
1506 	 */
1507 	outb_p(E8390_TXCONFIG | info->duplex_flag, e8390_base + EN0_TXCR);
1508 	if (must_resend)
1509     		outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
1510 }
1511 
1512 /*
1513  *	Collect the stats. This is called unlocked and from several contexts.
1514  */
1515 
1516 static struct net_device_stats *get_stats(struct net_device *dev)
1517 {
1518 	long ioaddr = dev->base_addr;
1519 	struct ei_device *ei_local = netdev_priv(dev);
1520 	unsigned long flags;
1521 
1522 	/* If the card is stopped, just return the present stats. */
1523 	if (!netif_running(dev))
1524 		return &dev->stats;
1525 
1526 	spin_lock_irqsave(&ei_local->page_lock,flags);
1527 	/* Read the counter registers, assuming we are in page 0. */
1528 	dev->stats.rx_frame_errors += inb_p(ioaddr + EN0_COUNTER0);
1529 	dev->stats.rx_crc_errors   += inb_p(ioaddr + EN0_COUNTER1);
1530 	dev->stats.rx_missed_errors+= inb_p(ioaddr + EN0_COUNTER2);
1531 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
1532 
1533 	return &dev->stats;
1534 }
1535 
1536 /*
1537  * Form the 64 bit 8390 multicast table from the linked list of addresses
1538  * associated with this dev structure.
1539  */
1540 
1541 static inline void make_mc_bits(u8 *bits, struct net_device *dev)
1542 {
1543 	struct netdev_hw_addr *ha;
1544 	u32 crc;
1545 
1546 	netdev_for_each_mc_addr(ha, dev) {
1547 		crc = ether_crc(ETH_ALEN, ha->addr);
1548 		/*
1549 		 * The 8390 uses the 6 most significant bits of the
1550 		 * CRC to index the multicast table.
1551 		 */
1552 		bits[crc>>29] |= (1<<((crc>>26)&7));
1553 	}
1554 }
1555 
1556 /**
1557  * do_set_multicast_list - set/clear multicast filter
1558  * @dev: net device for which multicast filter is adjusted
1559  *
1560  *	Set or clear the multicast filter for this adaptor.
1561  *	Must be called with lock held.
1562  */
1563 
1564 static void do_set_multicast_list(struct net_device *dev)
1565 {
1566 	long e8390_base = dev->base_addr;
1567 	int i;
1568 	struct ei_device *ei_local = netdev_priv(dev);
1569 
1570 	if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) {
1571 		memset(ei_local->mcfilter, 0, 8);
1572 		if (!netdev_mc_empty(dev))
1573 			make_mc_bits(ei_local->mcfilter, dev);
1574 	} else {
1575 		/* set to accept-all */
1576 		memset(ei_local->mcfilter, 0xFF, 8);
1577 	}
1578 
1579 	outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
1580 	for(i = 0; i < 8; i++)
1581 	{
1582 		outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
1583 	}
1584 	outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
1585 
1586   	if(dev->flags&IFF_PROMISC)
1587   		outb_p(E8390_RXCONFIG | 0x58, e8390_base + EN0_RXCR);
1588 	else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev))
1589   		outb_p(E8390_RXCONFIG | 0x48, e8390_base + EN0_RXCR);
1590   	else
1591   		outb_p(E8390_RXCONFIG | 0x40, e8390_base + EN0_RXCR);
1592 
1593 	outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1594 }
1595 
1596 /*
1597  *	Called without lock held. This is invoked from user context and may
1598  *	be parallel to just about everything else. Its also fairly quick and
1599  *	not called too often. Must protect against both bh and irq users
1600  */
1601 
1602 static void set_multicast_list(struct net_device *dev)
1603 {
1604 	unsigned long flags;
1605 
1606 	spin_lock_irqsave(&dev_lock(dev), flags);
1607 	do_set_multicast_list(dev);
1608 	spin_unlock_irqrestore(&dev_lock(dev), flags);
1609 }
1610 
1611 /* This page of functions should be 8390 generic */
1612 /* Follow National Semi's recommendations for initializing the "NIC". */
1613 
1614 /**
1615  * AX88190_init - initialize 8390 hardware
1616  * @dev: network device to initialize
1617  * @startp: boolean.  non-zero value to initiate chip processing
1618  *
1619  *	Must be called with lock held.
1620  */
1621 
1622 static void AX88190_init(struct net_device *dev, int startp)
1623 {
1624 	struct axnet_dev *info = PRIV(dev);
1625 	long e8390_base = dev->base_addr;
1626 	struct ei_device *ei_local = netdev_priv(dev);
1627 	int i;
1628 	int endcfg = ei_local->word16 ? (0x48 | ENDCFG_WTS) : 0x48;
1629 
1630 	if(sizeof(struct e8390_pkt_hdr)!=4)
1631     		panic("8390.c: header struct mispacked\n");
1632 	/* Follow National Semi's recommendations for initing the DP83902. */
1633 	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1634 	outb_p(endcfg, e8390_base + EN0_DCFG);	/* 0x48 or 0x49 */
1635 	/* Clear the remote byte count registers. */
1636 	outb_p(0x00,  e8390_base + EN0_RCNTLO);
1637 	outb_p(0x00,  e8390_base + EN0_RCNTHI);
1638 	/* Set to monitor and loopback mode -- this is vital!. */
1639 	outb_p(E8390_RXOFF|0x40, e8390_base + EN0_RXCR); /* 0x60 */
1640 	outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1641 	/* Set the transmit page and receive ring. */
1642 	outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1643 	ei_local->tx1 = ei_local->tx2 = 0;
1644 	outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1645 	outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY);	/* 3c503 says 0x3f,NS0x26*/
1646 	ei_local->current_page = ei_local->rx_start_page;		/* assert boundary+1 */
1647 	outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1648 	/* Clear the pending interrupts and mask. */
1649 	outb_p(0xFF, e8390_base + EN0_ISR);
1650 	outb_p(0x00,  e8390_base + EN0_IMR);
1651 
1652 	/* Copy the station address into the DS8390 registers. */
1653 
1654 	outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1655 	for(i = 0; i < 6; i++)
1656 	{
1657 		outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1658 		if(inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1659 			netdev_err(dev, "Hw. address read/write mismap %d\n", i);
1660 	}
1661 
1662 	outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1663 	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1664 
1665 	netif_start_queue(dev);
1666 	ei_local->tx1 = ei_local->tx2 = 0;
1667 	ei_local->txing = 0;
1668 
1669 	if (info->flags & IS_AX88790)	/* select Internal PHY */
1670 		outb(0x10, e8390_base + AXNET_GPIO);
1671 
1672 	if (startp)
1673 	{
1674 		outb_p(0xff,  e8390_base + EN0_ISR);
1675 		outb_p(ENISR_ALL,  e8390_base + EN0_IMR);
1676 		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1677 		outb_p(E8390_TXCONFIG | info->duplex_flag,
1678 		       e8390_base + EN0_TXCR); /* xmit on. */
1679 		/* 3c503 TechMan says rxconfig only after the NIC is started. */
1680 		outb_p(E8390_RXCONFIG | 0x40, e8390_base + EN0_RXCR); /* rx on, */
1681 		do_set_multicast_list(dev);	/* (re)load the mcast table */
1682 	}
1683 }
1684 
1685 /* Trigger a transmit start, assuming the length is valid.
1686    Always called with the page lock held */
1687 
1688 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1689 								int start_page)
1690 {
1691 	long e8390_base = dev->base_addr;
1692  	struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev);
1693 
1694 	if (inb_p(e8390_base) & E8390_TRANS)
1695 	{
1696 		netdev_warn(dev, "trigger_send() called with the transmitter busy\n");
1697 		return;
1698 	}
1699 	outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1700 	outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1701 	outb_p(start_page, e8390_base + EN0_TPSR);
1702 	outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1703 }
1704