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 <linux/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, unsigned int txqueue);
87 static irqreturn_t ei_irq_wrapper(int irq, void *dev_id);
88 static void ei_watchdog(struct timer_list *t);
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 
108 /*====================================================================*/
109 
110 struct axnet_dev {
111 	struct pcmcia_device	*p_dev;
112 	caddr_t	base;
113 	struct timer_list	watchdog;
114 	int	stale, fast_poll;
115 	u_short	link_status;
116 	u_char	duplex_flag;
117 	int	phy_id;
118 	int	flags;
119 	int	active_low;
120 };
121 
122 static inline struct axnet_dev *PRIV(struct net_device *dev)
123 {
124 	void *p = (char *)netdev_priv(dev) + sizeof(struct ei_device);
125 	return p;
126 }
127 
128 static const struct net_device_ops axnet_netdev_ops = {
129 	.ndo_open 		= axnet_open,
130 	.ndo_stop		= axnet_close,
131 	.ndo_eth_ioctl		= axnet_ioctl,
132 	.ndo_start_xmit		= axnet_start_xmit,
133 	.ndo_tx_timeout		= axnet_tx_timeout,
134 	.ndo_get_stats		= get_stats,
135 	.ndo_set_rx_mode	= set_multicast_list,
136 	.ndo_set_mac_address 	= eth_mac_addr,
137 	.ndo_validate_addr	= eth_validate_addr,
138 };
139 
140 static int axnet_probe(struct pcmcia_device *link)
141 {
142     struct axnet_dev *info;
143     struct net_device *dev;
144     struct ei_device *ei_local;
145 
146     dev_dbg(&link->dev, "axnet_attach()\n");
147 
148     dev = alloc_etherdev(sizeof(struct ei_device) + sizeof(struct axnet_dev));
149     if (!dev)
150 	return -ENOMEM;
151 
152     ei_local = netdev_priv(dev);
153     spin_lock_init(&ei_local->page_lock);
154 
155     info = PRIV(dev);
156     info->p_dev = link;
157     link->priv = dev;
158     link->config_flags |= CONF_ENABLE_IRQ;
159 
160     dev->netdev_ops = &axnet_netdev_ops;
161 
162     dev->watchdog_timeo = TX_TIMEOUT;
163 
164     return axnet_config(link);
165 } /* axnet_attach */
166 
167 static void axnet_detach(struct pcmcia_device *link)
168 {
169     struct net_device *dev = link->priv;
170 
171     dev_dbg(&link->dev, "axnet_detach(0x%p)\n", link);
172 
173     unregister_netdev(dev);
174 
175     axnet_release(link);
176 
177     free_netdev(dev);
178 } /* axnet_detach */
179 
180 /*======================================================================
181 
182     This probes for a card's hardware address by reading the PROM.
183 
184 ======================================================================*/
185 
186 static int get_prom(struct pcmcia_device *link)
187 {
188     struct net_device *dev = link->priv;
189     unsigned int ioaddr = dev->base_addr;
190     u8 addr[ETH_ALEN];
191     int i, j;
192 
193     /* This is based on drivers/net/ethernet/8390/ne.c */
194     struct {
195 	u_char value, offset;
196     } program_seq[] = {
197 	{E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, /* Select page 0*/
198 	{0x01,	EN0_DCFG},	/* Set word-wide access. */
199 	{0x00,	EN0_RCNTLO},	/* Clear the count regs. */
200 	{0x00,	EN0_RCNTHI},
201 	{0x00,	EN0_IMR},	/* Mask completion irq. */
202 	{0xFF,	EN0_ISR},
203 	{E8390_RXOFF|0x40, EN0_RXCR},	/* 0x60  Set to monitor */
204 	{E8390_TXOFF, EN0_TXCR},	/* 0x02  and loopback mode. */
205 	{0x10,	EN0_RCNTLO},
206 	{0x00,	EN0_RCNTHI},
207 	{0x00,	EN0_RSARLO},	/* DMA starting at 0x0400. */
208 	{0x04,	EN0_RSARHI},
209 	{E8390_RREAD+E8390_START, E8390_CMD},
210     };
211 
212     /* Not much of a test, but the alternatives are messy */
213     if (link->config_base != 0x03c0)
214 	return 0;
215 
216     axnet_reset_8390(dev);
217     mdelay(10);
218 
219     for (i = 0; i < ARRAY_SIZE(program_seq); i++)
220 	outb_p(program_seq[i].value, ioaddr + program_seq[i].offset);
221 
222     for (i = 0; i < 6; i += 2) {
223 	j = inw(ioaddr + AXNET_DATAPORT);
224 	addr[i] = j & 0xff;
225 	addr[i+1] = j >> 8;
226     }
227     eth_hw_addr_set(dev, addr);
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     timer_setup(&info->watchdog, ei_watchdog, 0);
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(struct timer_list *t)
552 {
553     struct axnet_dev *info = from_timer(info, t, watchdog);
554     struct net_device *dev = info->p_dev->priv;
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 	fallthrough;
617     case SIOCGMIIREG:		/* Read MII PHY register. */
618 	data->val_out = mdio_read(mii_addr, data->phy_id, data->reg_num & 0x1f);
619 	return 0;
620     case SIOCSMIIREG:		/* Write MII PHY register. */
621 	mdio_write(mii_addr, data->phy_id, data->reg_num & 0x1f, data->val_in);
622 	return 0;
623     }
624     return -EOPNOTSUPP;
625 }
626 
627 /*====================================================================*/
628 
629 static void get_8390_hdr(struct net_device *dev,
630 			 struct e8390_pkt_hdr *hdr,
631 			 int ring_page)
632 {
633     unsigned int nic_base = dev->base_addr;
634 
635     outb_p(0, nic_base + EN0_RSARLO);		/* On page boundary */
636     outb_p(ring_page, nic_base + EN0_RSARHI);
637     outb_p(E8390_RREAD+E8390_START, nic_base + AXNET_CMD);
638 
639     insw(nic_base + AXNET_DATAPORT, hdr,
640 	    sizeof(struct e8390_pkt_hdr)>>1);
641     /* Fix for big endian systems */
642     hdr->count = le16_to_cpu(hdr->count);
643 
644 }
645 
646 /*====================================================================*/
647 
648 static void block_input(struct net_device *dev, int count,
649 			struct sk_buff *skb, int ring_offset)
650 {
651     unsigned int nic_base = dev->base_addr;
652     struct ei_device *ei_local = netdev_priv(dev);
653     int xfer_count = count;
654     char *buf = skb->data;
655 
656     if ((netif_msg_rx_status(ei_local)) && (count != 4))
657 	netdev_dbg(dev, "[bi=%d]\n", count+4);
658     outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
659     outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
660     outb_p(E8390_RREAD+E8390_START, nic_base + AXNET_CMD);
661 
662     insw(nic_base + AXNET_DATAPORT,buf,count>>1);
663     if (count & 0x01) {
664 	buf[count-1] = inb(nic_base + AXNET_DATAPORT);
665 	xfer_count++;
666     }
667 
668 }
669 
670 /*====================================================================*/
671 
672 static void block_output(struct net_device *dev, int count,
673 			 const u_char *buf, const int start_page)
674 {
675     unsigned int nic_base = dev->base_addr;
676 
677     pr_debug("%s: [bo=%d]\n", dev->name, count);
678 
679     /* Round the count up for word writes.  Do we need to do this?
680        What effect will an odd byte count have on the 8390?
681        I should check someday. */
682     if (count & 0x01)
683 	count++;
684 
685     outb_p(0x00, nic_base + EN0_RSARLO);
686     outb_p(start_page, nic_base + EN0_RSARHI);
687     outb_p(E8390_RWRITE+E8390_START, nic_base + AXNET_CMD);
688     outsw(nic_base + AXNET_DATAPORT, buf, count>>1);
689 }
690 
691 static const struct pcmcia_device_id axnet_ids[] = {
692 	PCMCIA_PFC_DEVICE_MANF_CARD(0, 0x016c, 0x0081),
693 	PCMCIA_DEVICE_MANF_CARD(0x018a, 0x0301),
694 	PCMCIA_DEVICE_MANF_CARD(0x01bf, 0x2328),
695 	PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0301),
696 	PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0303),
697 	PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0309),
698 	PCMCIA_DEVICE_MANF_CARD(0x0274, 0x1106),
699 	PCMCIA_DEVICE_MANF_CARD(0x8a01, 0xc1ab),
700 	PCMCIA_DEVICE_MANF_CARD(0x021b, 0x0202),
701 	PCMCIA_DEVICE_MANF_CARD(0xffff, 0x1090),
702 	PCMCIA_DEVICE_PROD_ID12("AmbiCom,Inc.", "Fast Ethernet PC Card(AMB8110)", 0x49b020a7, 0x119cc9fc),
703 	PCMCIA_DEVICE_PROD_ID124("Fast Ethernet", "16-bit PC Card", "AX88190", 0xb4be14e3, 0x9a12eb6a, 0xab9be5ef),
704 	PCMCIA_DEVICE_PROD_ID12("ASIX", "AX88190", 0x0959823b, 0xab9be5ef),
705 	PCMCIA_DEVICE_PROD_ID12("Billionton", "LNA-100B", 0x552ab682, 0xbc3b87e1),
706 	PCMCIA_DEVICE_PROD_ID12("CHEETAH ETHERCARD", "EN2228", 0x00fa7bc8, 0x00e990cc),
707 	PCMCIA_DEVICE_PROD_ID12("CNet", "CNF301", 0xbc477dde, 0x78c5f40b),
708 	PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEther PCC-TXD", 0x5261440f, 0x436768c5),
709 	PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEtherII PCC-TXD", 0x5261440f, 0x730df72e),
710 	PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEther PCC-TXM", 0x5261440f, 0x3abbd061),
711 	PCMCIA_DEVICE_PROD_ID12("Dynalink", "L100C16", 0x55632fd5, 0x66bc2a90),
712 	PCMCIA_DEVICE_PROD_ID12("IO DATA", "ETXPCM", 0x547e66dc, 0x233adac2),
713 	PCMCIA_DEVICE_PROD_ID12("Linksys", "EtherFast 10/100 PC Card (PCMPC100 V3)", 0x0733cc81, 0x232019a8),
714 	PCMCIA_DEVICE_PROD_ID12("MELCO", "LPC3-TX", 0x481e0094, 0xf91af609),
715 	PCMCIA_DEVICE_PROD_ID12("NETGEAR", "FA411", 0x9aa79dc3, 0x40fad875),
716 	PCMCIA_DEVICE_PROD_ID12("PCMCIA", "100BASE", 0x281f1c5d, 0x7c2add04),
717 	PCMCIA_DEVICE_PROD_ID12("PCMCIA", "FastEtherCard", 0x281f1c5d, 0x7ef26116),
718 	PCMCIA_DEVICE_PROD_ID12("PCMCIA", "FEP501", 0x281f1c5d, 0x2e272058),
719 	PCMCIA_DEVICE_PROD_ID14("Network Everywhere", "AX88190", 0x820a67b6,  0xab9be5ef),
720 	PCMCIA_DEVICE_NULL,
721 };
722 MODULE_DEVICE_TABLE(pcmcia, axnet_ids);
723 
724 static struct pcmcia_driver axnet_cs_driver = {
725 	.owner		= THIS_MODULE,
726 	.name		= "axnet_cs",
727 	.probe		= axnet_probe,
728 	.remove		= axnet_detach,
729 	.id_table       = axnet_ids,
730 	.suspend	= axnet_suspend,
731 	.resume		= axnet_resume,
732 };
733 module_pcmcia_driver(axnet_cs_driver);
734 
735 /*====================================================================*/
736 
737 /* 8390.c: A general NS8390 ethernet driver core for linux. */
738 /*
739 	Written 1992-94 by Donald Becker.
740 
741 	Copyright 1993 United States Government as represented by the
742 	Director, National Security Agency.
743 
744 	This software may be used and distributed according to the terms
745 	of the GNU General Public License, incorporated herein by reference.
746 
747 	The author may be reached as becker@scyld.com, or C/O
748 	Scyld Computing Corporation
749 	410 Severn Ave., Suite 210
750 	Annapolis MD 21403
751 
752   This is the chip-specific code for many 8390-based ethernet adaptors.
753   This is not a complete driver, it must be combined with board-specific
754   code such as ne.c, wd.c, 3c503.c, etc.
755 
756   Seeing how at least eight drivers use this code, (not counting the
757   PCMCIA ones either) it is easy to break some card by what seems like
758   a simple innocent change. Please contact me or Donald if you think
759   you have found something that needs changing. -- PG
760 
761   Changelog:
762 
763   Paul Gortmaker	: remove set_bit lock, other cleanups.
764   Paul Gortmaker	: add ei_get_8390_hdr() so we can pass skb's to
765 			  ei_block_input() for eth_io_copy_and_sum().
766   Paul Gortmaker	: exchange static int ei_pingpong for a #define,
767 			  also add better Tx error handling.
768   Paul Gortmaker	: rewrite Rx overrun handling as per NS specs.
769   Alexey Kuznetsov	: use the 8390's six bit hash multicast filter.
770   Paul Gortmaker	: tweak ANK's above multicast changes a bit.
771   Paul Gortmaker	: update packet statistics for v2.1.x
772   Alan Cox		: support arbitrary stupid port mappings on the
773 			  68K Macintosh. Support >16bit I/O spaces
774   Paul Gortmaker	: add kmod support for auto-loading of the 8390
775 			  module by all drivers that require it.
776   Alan Cox		: Spinlocking work, added 'BUG_83C690'
777   Paul Gortmaker	: Separate out Tx timeout code from Tx path.
778 
779   Sources:
780   The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
781 
782   */
783 
784 #include <linux/bitops.h>
785 #include <asm/irq.h>
786 #include <linux/fcntl.h>
787 #include <linux/in.h>
788 #include <linux/interrupt.h>
789 
790 #define BUG_83C690
791 
792 /* These are the operational function interfaces to board-specific
793    routines.
794 	void reset_8390(struct net_device *dev)
795 		Resets the board associated with DEV, including a hardware reset of
796 		the 8390.  This is only called when there is a transmit timeout, and
797 		it is always followed by 8390_init().
798 	void block_output(struct net_device *dev, int count, const unsigned char *buf,
799 					  int start_page)
800 		Write the COUNT bytes of BUF to the packet buffer at START_PAGE.  The
801 		"page" value uses the 8390's 256-byte pages.
802 	void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page)
803 		Read the 4 byte, page aligned 8390 header. *If* there is a
804 		subsequent read, it will be of the rest of the packet.
805 	void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
806 		Read COUNT bytes from the packet buffer into the skb data area. Start
807 		reading from RING_OFFSET, the address as the 8390 sees it.  This will always
808 		follow the read of the 8390 header.
809 */
810 #define ei_reset_8390 (ei_local->reset_8390)
811 #define ei_block_output (ei_local->block_output)
812 #define ei_block_input (ei_local->block_input)
813 #define ei_get_8390_hdr (ei_local->get_8390_hdr)
814 
815 /* Index to functions. */
816 static void ei_tx_intr(struct net_device *dev);
817 static void ei_tx_err(struct net_device *dev);
818 static void ei_receive(struct net_device *dev);
819 static void ei_rx_overrun(struct net_device *dev);
820 
821 /* Routines generic to NS8390-based boards. */
822 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
823 								int start_page);
824 static void do_set_multicast_list(struct net_device *dev);
825 
826 /*
827  *	SMP and the 8390 setup.
828  *
829  *	The 8390 isn't exactly designed to be multithreaded on RX/TX. There is
830  *	a page register that controls bank and packet buffer access. We guard
831  *	this with ei_local->page_lock. Nobody should assume or set the page other
832  *	than zero when the lock is not held. Lock holders must restore page 0
833  *	before unlocking. Even pure readers must take the lock to protect in
834  *	page 0.
835  *
836  *	To make life difficult the chip can also be very slow. We therefore can't
837  *	just use spinlocks. For the longer lockups we disable the irq the device
838  *	sits on and hold the lock. We must hold the lock because there is a dual
839  *	processor case other than interrupts (get stats/set multicast list in
840  *	parallel with each other and transmit).
841  *
842  *	Note: in theory we can just disable the irq on the card _but_ there is
843  *	a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
844  *	enter lock, take the queued irq. So we waddle instead of flying.
845  *
846  *	Finally by special arrangement for the purpose of being generally
847  *	annoying the transmit function is called bh atomic. That places
848  *	restrictions on the user context callers as disable_irq won't save
849  *	them.
850  */
851 
852 /**
853  * ax_open - Open/initialize the board.
854  * @dev: network device to initialize
855  *
856  * This routine goes all-out, setting everything
857  * up anew at each open, even though many of these registers should only
858  * need to be set once at boot.
859  */
860 static int ax_open(struct net_device *dev)
861 {
862 	unsigned long flags;
863 	struct ei_device *ei_local = netdev_priv(dev);
864 
865 	/*
866 	 *	Grab the page lock so we own the register set, then call
867 	 *	the init function.
868 	 */
869 
870       	spin_lock_irqsave(&ei_local->page_lock, flags);
871 	AX88190_init(dev, 1);
872 	/* Set the flag before we drop the lock, That way the IRQ arrives
873 	   after its set and we get no silly warnings */
874 	netif_start_queue(dev);
875       	spin_unlock_irqrestore(&ei_local->page_lock, flags);
876 	ei_local->irqlock = 0;
877 	return 0;
878 }
879 
880 #define dev_lock(dev) (((struct ei_device *)netdev_priv(dev))->page_lock)
881 
882 /**
883  * ax_close - shut down network device
884  * @dev: network device to close
885  *
886  * Opposite of ax_open(). Only used when "ifconfig <devname> down" is done.
887  */
888 static int ax_close(struct net_device *dev)
889 {
890 	unsigned long flags;
891 
892 	/*
893 	 *      Hold the page lock during close
894 	 */
895 
896 	spin_lock_irqsave(&dev_lock(dev), flags);
897 	AX88190_init(dev, 0);
898 	spin_unlock_irqrestore(&dev_lock(dev), flags);
899 	netif_stop_queue(dev);
900 	return 0;
901 }
902 
903 /**
904  * axnet_tx_timeout - handle transmit time out condition
905  * @dev: network device which has apparently fallen asleep
906  * @txqueue: unused
907  *
908  * Called by kernel when device never acknowledges a transmit has
909  * completed (or failed) - i.e. never posted a Tx related interrupt.
910  */
911 
912 static void axnet_tx_timeout(struct net_device *dev, unsigned int txqueue)
913 {
914 	long e8390_base = dev->base_addr;
915 	struct ei_device *ei_local = netdev_priv(dev);
916 	int txsr, isr, tickssofar = jiffies - dev_trans_start(dev);
917 	unsigned long flags;
918 
919 	dev->stats.tx_errors++;
920 
921 	spin_lock_irqsave(&ei_local->page_lock, flags);
922 	txsr = inb(e8390_base+EN0_TSR);
923 	isr = inb(e8390_base+EN0_ISR);
924 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
925 
926 	netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
927 		   (txsr & ENTSR_ABT) ? "excess collisions." :
928 		   (isr) ? "lost interrupt?" : "cable problem?",
929 		   txsr, isr, tickssofar);
930 
931 	if (!isr && !dev->stats.tx_packets)
932 	{
933 		/* The 8390 probably hasn't gotten on the cable yet. */
934 		ei_local->interface_num ^= 1;   /* Try a different xcvr.  */
935 	}
936 
937 	/* Ugly but a reset can be slow, yet must be protected */
938 
939 	spin_lock_irqsave(&ei_local->page_lock, flags);
940 
941 	/* Try to restart the card.  Perhaps the user has fixed something. */
942 	ei_reset_8390(dev);
943 	AX88190_init(dev, 1);
944 
945 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
946 	netif_wake_queue(dev);
947 }
948 
949 /**
950  * axnet_start_xmit - begin packet transmission
951  * @skb: packet to be sent
952  * @dev: network device to which packet is sent
953  *
954  * Sends a packet to an 8390 network device.
955  */
956 
957 static netdev_tx_t axnet_start_xmit(struct sk_buff *skb,
958 					  struct net_device *dev)
959 {
960 	long e8390_base = dev->base_addr;
961 	struct ei_device *ei_local = netdev_priv(dev);
962 	int length, send_length, output_page;
963 	unsigned long flags;
964 	u8 packet[ETH_ZLEN];
965 
966 	netif_stop_queue(dev);
967 
968 	length = skb->len;
969 
970 	/* Mask interrupts from the ethercard.
971 	   SMP: We have to grab the lock here otherwise the IRQ handler
972 	   on another CPU can flip window and race the IRQ mask set. We end
973 	   up trashing the mcast filter not disabling irqs if we don't lock */
974 
975 	spin_lock_irqsave(&ei_local->page_lock, flags);
976 	outb_p(0x00, e8390_base + EN0_IMR);
977 
978 	/*
979 	 *	Slow phase with lock held.
980 	 */
981 
982 	ei_local->irqlock = 1;
983 
984 	send_length = max(length, ETH_ZLEN);
985 
986 	/*
987 	 * We have two Tx slots available for use. Find the first free
988 	 * slot, and then perform some sanity checks. With two Tx bufs,
989 	 * you get very close to transmitting back-to-back packets. With
990 	 * only one Tx buf, the transmitter sits idle while you reload the
991 	 * card, leaving a substantial gap between each transmitted packet.
992 	 */
993 
994 	if (ei_local->tx1 == 0)
995 	{
996 		output_page = ei_local->tx_start_page;
997 		ei_local->tx1 = send_length;
998 		if ((netif_msg_tx_queued(ei_local)) &&
999 		    ei_local->tx2 > 0)
1000 			netdev_dbg(dev,
1001 				   "idle transmitter tx2=%d, lasttx=%d, txing=%d\n",
1002 				   ei_local->tx2, ei_local->lasttx,
1003 				   ei_local->txing);
1004 	}
1005 	else if (ei_local->tx2 == 0)
1006 	{
1007 		output_page = ei_local->tx_start_page + TX_PAGES/2;
1008 		ei_local->tx2 = send_length;
1009 		if ((netif_msg_tx_queued(ei_local)) &&
1010 		    ei_local->tx1 > 0)
1011 			netdev_dbg(dev,
1012 				   "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n",
1013 				   ei_local->tx1, ei_local->lasttx,
1014 				   ei_local->txing);
1015 	}
1016 	else
1017 	{	/* We should never get here. */
1018 		netif_dbg(ei_local, tx_err, dev,
1019 			  "No Tx buffers free! tx1=%d tx2=%d last=%d\n",
1020 			  ei_local->tx1, ei_local->tx2,
1021 			  ei_local->lasttx);
1022 		ei_local->irqlock = 0;
1023 		netif_stop_queue(dev);
1024 		outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1025 		spin_unlock_irqrestore(&ei_local->page_lock, flags);
1026 		dev->stats.tx_errors++;
1027 		return NETDEV_TX_BUSY;
1028 	}
1029 
1030 	/*
1031 	 * Okay, now upload the packet and trigger a send if the transmitter
1032 	 * isn't already sending. If it is busy, the interrupt handler will
1033 	 * trigger the send later, upon receiving a Tx done interrupt.
1034 	 */
1035 
1036 	if (length == skb->len)
1037 		ei_block_output(dev, length, skb->data, output_page);
1038 	else {
1039 		memset(packet, 0, ETH_ZLEN);
1040 		skb_copy_from_linear_data(skb, packet, skb->len);
1041 		ei_block_output(dev, length, packet, output_page);
1042 	}
1043 
1044 	if (! ei_local->txing)
1045 	{
1046 		ei_local->txing = 1;
1047 		NS8390_trigger_send(dev, send_length, output_page);
1048 		netif_trans_update(dev);
1049 		if (output_page == ei_local->tx_start_page)
1050 		{
1051 			ei_local->tx1 = -1;
1052 			ei_local->lasttx = -1;
1053 		}
1054 		else
1055 		{
1056 			ei_local->tx2 = -1;
1057 			ei_local->lasttx = -2;
1058 		}
1059 	}
1060 	else ei_local->txqueue++;
1061 
1062 	if (ei_local->tx1  &&  ei_local->tx2)
1063 		netif_stop_queue(dev);
1064 	else
1065 		netif_start_queue(dev);
1066 
1067 	/* Turn 8390 interrupts back on. */
1068 	ei_local->irqlock = 0;
1069 	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1070 
1071 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
1072 
1073 	dev_kfree_skb (skb);
1074 	dev->stats.tx_bytes += send_length;
1075 
1076 	return NETDEV_TX_OK;
1077 }
1078 
1079 /**
1080  * ax_interrupt - handle the interrupts from an 8390
1081  * @irq: interrupt number
1082  * @dev_id: a pointer to the net_device
1083  *
1084  * Handle the ether interface interrupts. We pull packets from
1085  * the 8390 via the card specific functions and fire them at the networking
1086  * stack. We also handle transmit completions and wake the transmit path if
1087  * necessary. We also update the counters and do other housekeeping as
1088  * needed.
1089  */
1090 
1091 static irqreturn_t ax_interrupt(int irq, void *dev_id)
1092 {
1093 	struct net_device *dev = dev_id;
1094 	long e8390_base;
1095 	int interrupts, nr_serviced = 0, i;
1096 	struct ei_device *ei_local;
1097 	int handled = 0;
1098 	unsigned long flags;
1099 
1100 	e8390_base = dev->base_addr;
1101 	ei_local = netdev_priv(dev);
1102 
1103 	/*
1104 	 *	Protect the irq test too.
1105 	 */
1106 
1107 	spin_lock_irqsave(&ei_local->page_lock, flags);
1108 
1109 	if (ei_local->irqlock) {
1110 #if 1 /* This might just be an interrupt for a PCI device sharing this line */
1111 		const char *msg;
1112 		/* The "irqlock" check is only for testing. */
1113 		if (ei_local->irqlock)
1114 			msg = "Interrupted while interrupts are masked!";
1115 		else
1116 			msg = "Reentering the interrupt handler!";
1117 		netdev_info(dev, "%s, isr=%#2x imr=%#2x\n",
1118 			    msg,
1119 			    inb_p(e8390_base + EN0_ISR),
1120 			    inb_p(e8390_base + EN0_IMR));
1121 #endif
1122 		spin_unlock_irqrestore(&ei_local->page_lock, flags);
1123 		return IRQ_NONE;
1124 	}
1125 
1126 	netif_dbg(ei_local, intr, dev, "interrupt(isr=%#2.2x)\n",
1127 		  inb_p(e8390_base + EN0_ISR));
1128 
1129 	outb_p(0x00, e8390_base + EN0_ISR);
1130 	ei_local->irqlock = 1;
1131 
1132 	/* !!Assumption!! -- we stay in page 0.	 Don't break this. */
1133 	while ((interrupts = inb_p(e8390_base + EN0_ISR)) != 0 &&
1134 	       ++nr_serviced < MAX_SERVICE)
1135 	{
1136 		if (!netif_running(dev) || (interrupts == 0xff)) {
1137 			netif_warn(ei_local, intr, dev,
1138 				   "interrupt from stopped card\n");
1139 			outb_p(interrupts, e8390_base + EN0_ISR);
1140 			interrupts = 0;
1141 			break;
1142 		}
1143 		handled = 1;
1144 
1145 		/* AX88190 bug fix. */
1146 		outb_p(interrupts, e8390_base + EN0_ISR);
1147 		for (i = 0; i < 10; i++) {
1148 			if (!(inb(e8390_base + EN0_ISR) & interrupts))
1149 				break;
1150 			outb_p(0, e8390_base + EN0_ISR);
1151 			outb_p(interrupts, e8390_base + EN0_ISR);
1152 		}
1153 		if (interrupts & ENISR_OVER)
1154 			ei_rx_overrun(dev);
1155 		else if (interrupts & (ENISR_RX+ENISR_RX_ERR))
1156 		{
1157 			/* Got a good (?) packet. */
1158 			ei_receive(dev);
1159 		}
1160 		/* Push the next to-transmit packet through. */
1161 		if (interrupts & ENISR_TX)
1162 			ei_tx_intr(dev);
1163 		else if (interrupts & ENISR_TX_ERR)
1164 			ei_tx_err(dev);
1165 
1166 		if (interrupts & ENISR_COUNTERS)
1167 		{
1168 			dev->stats.rx_frame_errors += inb_p(e8390_base + EN0_COUNTER0);
1169 			dev->stats.rx_crc_errors   += inb_p(e8390_base + EN0_COUNTER1);
1170 			dev->stats.rx_missed_errors+= inb_p(e8390_base + EN0_COUNTER2);
1171 		}
1172 	}
1173 
1174 	if (interrupts && (netif_msg_intr(ei_local)))
1175 	{
1176 		handled = 1;
1177 		if (nr_serviced >= MAX_SERVICE)
1178 		{
1179 			/* 0xFF is valid for a card removal */
1180 			if (interrupts != 0xFF)
1181 				netdev_warn(dev,
1182 					    "Too much work at interrupt, status %#2.2x\n",
1183 					    interrupts);
1184 			outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
1185 		} else {
1186 			netdev_warn(dev, "unknown interrupt %#2x\n",
1187 				    interrupts);
1188 			outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
1189 		}
1190 	}
1191 
1192 	/* Turn 8390 interrupts back on. */
1193 	ei_local->irqlock = 0;
1194 	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1195 
1196 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
1197 	return IRQ_RETVAL(handled);
1198 }
1199 
1200 /**
1201  * ei_tx_err - handle transmitter error
1202  * @dev: network device which threw the exception
1203  *
1204  * A transmitter error has happened. Most likely excess collisions (which
1205  * is a fairly normal condition). If the error is one where the Tx will
1206  * have been aborted, we try and send another one right away, instead of
1207  * letting the failed packet sit and collect dust in the Tx buffer. This
1208  * is a much better solution as it avoids kernel based Tx timeouts, and
1209  * an unnecessary card reset.
1210  *
1211  * Called with lock held.
1212  */
1213 
1214 static void ei_tx_err(struct net_device *dev)
1215 {
1216 	long e8390_base = dev->base_addr;
1217 	unsigned char txsr = inb_p(e8390_base+EN0_TSR);
1218 	unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
1219 
1220 #ifdef VERBOSE_ERROR_DUMP
1221 	netdev_dbg(dev, "transmitter error (%#2x):", txsr);
1222 	if (txsr & ENTSR_ABT)
1223 		pr_cont(" excess-collisions");
1224 	if (txsr & ENTSR_ND)
1225 		pr_cont(" non-deferral");
1226 	if (txsr & ENTSR_CRS)
1227 		pr_cont(" lost-carrier");
1228 	if (txsr & ENTSR_FU)
1229 		pr_cont(" FIFO-underrun");
1230 	if (txsr & ENTSR_CDH)
1231 		pr_cont(" lost-heartbeat");
1232 	pr_cont("\n");
1233 #endif
1234 
1235 	if (tx_was_aborted)
1236 		ei_tx_intr(dev);
1237 	else
1238 	{
1239 		dev->stats.tx_errors++;
1240 		if (txsr & ENTSR_CRS) dev->stats.tx_carrier_errors++;
1241 		if (txsr & ENTSR_CDH) dev->stats.tx_heartbeat_errors++;
1242 		if (txsr & ENTSR_OWC) dev->stats.tx_window_errors++;
1243 	}
1244 }
1245 
1246 /**
1247  * ei_tx_intr - transmit interrupt handler
1248  * @dev: network device for which tx intr is handled
1249  *
1250  * We have finished a transmit: check for errors and then trigger the next
1251  * packet to be sent. Called with lock held.
1252  */
1253 
1254 static void ei_tx_intr(struct net_device *dev)
1255 {
1256 	long e8390_base = dev->base_addr;
1257 	struct ei_device *ei_local = netdev_priv(dev);
1258 	int status = inb(e8390_base + EN0_TSR);
1259 
1260 	/*
1261 	 * There are two Tx buffers, see which one finished, and trigger
1262 	 * the send of another one if it exists.
1263 	 */
1264 	ei_local->txqueue--;
1265 
1266 	if (ei_local->tx1 < 0)
1267 	{
1268 		if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
1269 			netdev_err(dev, "%s: bogus last_tx_buffer %d, tx1=%d\n",
1270 				   ei_local->name, ei_local->lasttx,
1271 				   ei_local->tx1);
1272 		ei_local->tx1 = 0;
1273 		if (ei_local->tx2 > 0)
1274 		{
1275 			ei_local->txing = 1;
1276 			NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
1277 			netif_trans_update(dev);
1278 			ei_local->tx2 = -1;
1279 			ei_local->lasttx = 2;
1280 		} else {
1281 			ei_local->lasttx = 20;
1282 			ei_local->txing = 0;
1283 		}
1284 	}
1285 	else if (ei_local->tx2 < 0)
1286 	{
1287 		if (ei_local->lasttx != 2  &&  ei_local->lasttx != -2)
1288 			netdev_err(dev, "%s: bogus last_tx_buffer %d, tx2=%d\n",
1289 				   ei_local->name, ei_local->lasttx,
1290 				   ei_local->tx2);
1291 		ei_local->tx2 = 0;
1292 		if (ei_local->tx1 > 0)
1293 		{
1294 			ei_local->txing = 1;
1295 			NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
1296 			netif_trans_update(dev);
1297 			ei_local->tx1 = -1;
1298 			ei_local->lasttx = 1;
1299 		} else {
1300 			ei_local->lasttx = 10;
1301 			ei_local->txing = 0;
1302 		}
1303 	}
1304 //	else
1305 //		netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n",
1306 //			    ei_local->lasttx);
1307 
1308 	/* Minimize Tx latency: update the statistics after we restart TXing. */
1309 	if (status & ENTSR_COL)
1310 		dev->stats.collisions++;
1311 	if (status & ENTSR_PTX)
1312 		dev->stats.tx_packets++;
1313 	else
1314 	{
1315 		dev->stats.tx_errors++;
1316 		if (status & ENTSR_ABT)
1317 		{
1318 			dev->stats.tx_aborted_errors++;
1319 			dev->stats.collisions += 16;
1320 		}
1321 		if (status & ENTSR_CRS)
1322 			dev->stats.tx_carrier_errors++;
1323 		if (status & ENTSR_FU)
1324 			dev->stats.tx_fifo_errors++;
1325 		if (status & ENTSR_CDH)
1326 			dev->stats.tx_heartbeat_errors++;
1327 		if (status & ENTSR_OWC)
1328 			dev->stats.tx_window_errors++;
1329 	}
1330 	netif_wake_queue(dev);
1331 }
1332 
1333 /**
1334  * ei_receive - receive some packets
1335  * @dev: network device with which receive will be run
1336  *
1337  * We have a good packet(s), get it/them out of the buffers.
1338  * Called with lock held.
1339  */
1340 
1341 static void ei_receive(struct net_device *dev)
1342 {
1343 	long e8390_base = dev->base_addr;
1344 	struct ei_device *ei_local = netdev_priv(dev);
1345 	unsigned char rxing_page, this_frame, next_frame;
1346 	unsigned short current_offset;
1347 	int rx_pkt_count = 0;
1348 	struct e8390_pkt_hdr rx_frame;
1349 
1350 	while (++rx_pkt_count < 10)
1351 	{
1352 		int pkt_len, pkt_stat;
1353 
1354 		/* Get the rx page (incoming packet pointer). */
1355 		rxing_page = inb_p(e8390_base + EN1_CURPAG -1);
1356 
1357 		/* Remove one frame from the ring.  Boundary is always a page behind. */
1358 		this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1;
1359 		if (this_frame >= ei_local->stop_page)
1360 			this_frame = ei_local->rx_start_page;
1361 
1362 		/* Someday we'll omit the previous, iff we never get this message.
1363 		   (There is at least one clone claimed to have a problem.)
1364 
1365 		   Keep quiet if it looks like a card removal. One problem here
1366 		   is that some clones crash in roughly the same way.
1367 		 */
1368 		if ((netif_msg_rx_err(ei_local)) &&
1369 		    this_frame != ei_local->current_page &&
1370 		    (this_frame != 0x0 || rxing_page != 0xFF))
1371 			netdev_err(dev, "mismatched read page pointers %2x vs %2x\n",
1372 				   this_frame, ei_local->current_page);
1373 
1374 		if (this_frame == rxing_page)	/* Read all the frames? */
1375 			break;				/* Done for now */
1376 
1377 		current_offset = this_frame << 8;
1378 		ei_get_8390_hdr(dev, &rx_frame, this_frame);
1379 
1380 		pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
1381 		pkt_stat = rx_frame.status;
1382 
1383 		next_frame = this_frame + 1 + ((pkt_len+4)>>8);
1384 
1385 		if (pkt_len < 60  ||  pkt_len > 1518)
1386 		{
1387 			netif_err(ei_local, rx_err, dev,
1388 				  "bogus packet size: %d, status=%#2x nxpg=%#2x\n",
1389 				  rx_frame.count, rx_frame.status,
1390 				  rx_frame.next);
1391 			dev->stats.rx_errors++;
1392 			dev->stats.rx_length_errors++;
1393 		}
1394 		 else if ((pkt_stat & 0x0F) == ENRSR_RXOK)
1395 		{
1396 			struct sk_buff *skb;
1397 
1398 			skb = netdev_alloc_skb(dev, pkt_len + 2);
1399 			if (skb == NULL)
1400 			{
1401 				netif_err(ei_local, rx_err, dev,
1402 					  "Couldn't allocate a sk_buff of size %d\n",
1403 					  pkt_len);
1404 				dev->stats.rx_dropped++;
1405 				break;
1406 			}
1407 			else
1408 			{
1409 				skb_reserve(skb,2);	/* IP headers on 16 byte boundaries */
1410 				skb_put(skb, pkt_len);	/* Make room */
1411 				ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
1412 				skb->protocol=eth_type_trans(skb,dev);
1413 				netif_rx(skb);
1414 				dev->stats.rx_packets++;
1415 				dev->stats.rx_bytes += pkt_len;
1416 				if (pkt_stat & ENRSR_PHY)
1417 					dev->stats.multicast++;
1418 			}
1419 		}
1420 		else
1421 		{
1422 			netif_err(ei_local, rx_err, dev,
1423 				  "bogus packet: status=%#2x nxpg=%#2x size=%d\n",
1424 				  rx_frame.status, rx_frame.next,
1425 				  rx_frame.count);
1426 			dev->stats.rx_errors++;
1427 			/* NB: The NIC counts CRC, frame and missed errors. */
1428 			if (pkt_stat & ENRSR_FO)
1429 				dev->stats.rx_fifo_errors++;
1430 		}
1431 		next_frame = rx_frame.next;
1432 
1433 		/* This _should_ never happen: it's here for avoiding bad clones. */
1434 		if (next_frame >= ei_local->stop_page) {
1435 			netdev_info(dev, "next frame inconsistency, %#2x\n",
1436 				    next_frame);
1437 			next_frame = ei_local->rx_start_page;
1438 		}
1439 		ei_local->current_page = next_frame;
1440 		outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
1441 	}
1442 }
1443 
1444 /**
1445  * ei_rx_overrun - handle receiver overrun
1446  * @dev: network device which threw exception
1447  *
1448  * We have a receiver overrun: we have to kick the 8390 to get it started
1449  * again. Problem is that you have to kick it exactly as NS prescribes in
1450  * the updated datasheets, or "the NIC may act in an unpredictable manner."
1451  * This includes causing "the NIC to defer indefinitely when it is stopped
1452  * on a busy network."  Ugh.
1453  * Called with lock held. Don't call this with the interrupts off or your
1454  * computer will hate you - it takes 10ms or so.
1455  */
1456 
1457 static void ei_rx_overrun(struct net_device *dev)
1458 {
1459 	struct axnet_dev *info = PRIV(dev);
1460 	long e8390_base = dev->base_addr;
1461 	unsigned char was_txing, must_resend = 0;
1462 	struct ei_device *ei_local = netdev_priv(dev);
1463 
1464 	/*
1465 	 * Record whether a Tx was in progress and then issue the
1466 	 * stop command.
1467 	 */
1468 	was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
1469 	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1470 
1471 	netif_dbg(ei_local, rx_err, dev, "Receiver overrun\n");
1472 	dev->stats.rx_over_errors++;
1473 
1474 	/*
1475 	 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
1476 	 * We wait at least 2ms.
1477 	 */
1478 
1479 	mdelay(2);
1480 
1481 	/*
1482 	 * Reset RBCR[01] back to zero as per magic incantation.
1483 	 */
1484 	outb_p(0x00, e8390_base+EN0_RCNTLO);
1485 	outb_p(0x00, e8390_base+EN0_RCNTHI);
1486 
1487 	/*
1488 	 * See if any Tx was interrupted or not. According to NS, this
1489 	 * step is vital, and skipping it will cause no end of havoc.
1490 	 */
1491 
1492 	if (was_txing)
1493 	{
1494 		unsigned char tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
1495 		if (!tx_completed)
1496 			must_resend = 1;
1497 	}
1498 
1499 	/*
1500 	 * Have to enter loopback mode and then restart the NIC before
1501 	 * you are allowed to slurp packets up off the ring.
1502 	 */
1503 	outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
1504 	outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
1505 
1506 	/*
1507 	 * Clear the Rx ring of all the debris, and ack the interrupt.
1508 	 */
1509 	ei_receive(dev);
1510 
1511 	/*
1512 	 * Leave loopback mode, and resend any packet that got stopped.
1513 	 */
1514 	outb_p(E8390_TXCONFIG | info->duplex_flag, e8390_base + EN0_TXCR);
1515 	if (must_resend)
1516     		outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
1517 }
1518 
1519 /*
1520  *	Collect the stats. This is called unlocked and from several contexts.
1521  */
1522 
1523 static struct net_device_stats *get_stats(struct net_device *dev)
1524 {
1525 	long ioaddr = dev->base_addr;
1526 	struct ei_device *ei_local = netdev_priv(dev);
1527 	unsigned long flags;
1528 
1529 	/* If the card is stopped, just return the present stats. */
1530 	if (!netif_running(dev))
1531 		return &dev->stats;
1532 
1533 	spin_lock_irqsave(&ei_local->page_lock,flags);
1534 	/* Read the counter registers, assuming we are in page 0. */
1535 	dev->stats.rx_frame_errors += inb_p(ioaddr + EN0_COUNTER0);
1536 	dev->stats.rx_crc_errors   += inb_p(ioaddr + EN0_COUNTER1);
1537 	dev->stats.rx_missed_errors+= inb_p(ioaddr + EN0_COUNTER2);
1538 	spin_unlock_irqrestore(&ei_local->page_lock, flags);
1539 
1540 	return &dev->stats;
1541 }
1542 
1543 /*
1544  * Form the 64 bit 8390 multicast table from the linked list of addresses
1545  * associated with this dev structure.
1546  */
1547 
1548 static inline void make_mc_bits(u8 *bits, struct net_device *dev)
1549 {
1550 	struct netdev_hw_addr *ha;
1551 	u32 crc;
1552 
1553 	netdev_for_each_mc_addr(ha, dev) {
1554 		crc = ether_crc(ETH_ALEN, ha->addr);
1555 		/*
1556 		 * The 8390 uses the 6 most significant bits of the
1557 		 * CRC to index the multicast table.
1558 		 */
1559 		bits[crc>>29] |= (1<<((crc>>26)&7));
1560 	}
1561 }
1562 
1563 /**
1564  * do_set_multicast_list - set/clear multicast filter
1565  * @dev: net device for which multicast filter is adjusted
1566  *
1567  *	Set or clear the multicast filter for this adaptor.
1568  *	Must be called with lock held.
1569  */
1570 
1571 static void do_set_multicast_list(struct net_device *dev)
1572 {
1573 	long e8390_base = dev->base_addr;
1574 	int i;
1575 	struct ei_device *ei_local = netdev_priv(dev);
1576 
1577 	if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) {
1578 		memset(ei_local->mcfilter, 0, 8);
1579 		if (!netdev_mc_empty(dev))
1580 			make_mc_bits(ei_local->mcfilter, dev);
1581 	} else {
1582 		/* set to accept-all */
1583 		memset(ei_local->mcfilter, 0xFF, 8);
1584 	}
1585 
1586 	outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
1587 	for(i = 0; i < 8; i++)
1588 	{
1589 		outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
1590 	}
1591 	outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
1592 
1593 	if(dev->flags&IFF_PROMISC)
1594 		outb_p(E8390_RXCONFIG | 0x58, e8390_base + EN0_RXCR);
1595 	else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev))
1596 		outb_p(E8390_RXCONFIG | 0x48, e8390_base + EN0_RXCR);
1597 	else
1598 		outb_p(E8390_RXCONFIG | 0x40, e8390_base + EN0_RXCR);
1599 
1600 	outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1601 }
1602 
1603 /*
1604  *	Called without lock held. This is invoked from user context and may
1605  *	be parallel to just about everything else. Its also fairly quick and
1606  *	not called too often. Must protect against both bh and irq users
1607  */
1608 
1609 static void set_multicast_list(struct net_device *dev)
1610 {
1611 	unsigned long flags;
1612 
1613 	spin_lock_irqsave(&dev_lock(dev), flags);
1614 	do_set_multicast_list(dev);
1615 	spin_unlock_irqrestore(&dev_lock(dev), flags);
1616 }
1617 
1618 /* This page of functions should be 8390 generic */
1619 /* Follow National Semi's recommendations for initializing the "NIC". */
1620 
1621 /**
1622  * AX88190_init - initialize 8390 hardware
1623  * @dev: network device to initialize
1624  * @startp: boolean.  non-zero value to initiate chip processing
1625  *
1626  *	Must be called with lock held.
1627  */
1628 
1629 static void AX88190_init(struct net_device *dev, int startp)
1630 {
1631 	struct axnet_dev *info = PRIV(dev);
1632 	long e8390_base = dev->base_addr;
1633 	struct ei_device *ei_local = netdev_priv(dev);
1634 	int i;
1635 	int endcfg = ei_local->word16 ? (0x48 | ENDCFG_WTS) : 0x48;
1636 
1637 	if(sizeof(struct e8390_pkt_hdr)!=4)
1638     		panic("8390.c: header struct mispacked\n");
1639 	/* Follow National Semi's recommendations for initing the DP83902. */
1640 	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1641 	outb_p(endcfg, e8390_base + EN0_DCFG);	/* 0x48 or 0x49 */
1642 	/* Clear the remote byte count registers. */
1643 	outb_p(0x00,  e8390_base + EN0_RCNTLO);
1644 	outb_p(0x00,  e8390_base + EN0_RCNTHI);
1645 	/* Set to monitor and loopback mode -- this is vital!. */
1646 	outb_p(E8390_RXOFF|0x40, e8390_base + EN0_RXCR); /* 0x60 */
1647 	outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1648 	/* Set the transmit page and receive ring. */
1649 	outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1650 	ei_local->tx1 = ei_local->tx2 = 0;
1651 	outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1652 	outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY);	/* 3c503 says 0x3f,NS0x26*/
1653 	ei_local->current_page = ei_local->rx_start_page;		/* assert boundary+1 */
1654 	outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1655 	/* Clear the pending interrupts and mask. */
1656 	outb_p(0xFF, e8390_base + EN0_ISR);
1657 	outb_p(0x00,  e8390_base + EN0_IMR);
1658 
1659 	/* Copy the station address into the DS8390 registers. */
1660 
1661 	outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1662 	for(i = 0; i < 6; i++)
1663 	{
1664 		outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1665 		if(inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1666 			netdev_err(dev, "Hw. address read/write mismap %d\n", i);
1667 	}
1668 
1669 	outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1670 	outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1671 
1672 	netif_start_queue(dev);
1673 	ei_local->tx1 = ei_local->tx2 = 0;
1674 	ei_local->txing = 0;
1675 
1676 	if (info->flags & IS_AX88790)	/* select Internal PHY */
1677 		outb(0x10, e8390_base + AXNET_GPIO);
1678 
1679 	if (startp)
1680 	{
1681 		outb_p(0xff,  e8390_base + EN0_ISR);
1682 		outb_p(ENISR_ALL,  e8390_base + EN0_IMR);
1683 		outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1684 		outb_p(E8390_TXCONFIG | info->duplex_flag,
1685 		       e8390_base + EN0_TXCR); /* xmit on. */
1686 		/* 3c503 TechMan says rxconfig only after the NIC is started. */
1687 		outb_p(E8390_RXCONFIG | 0x40, e8390_base + EN0_RXCR); /* rx on, */
1688 		do_set_multicast_list(dev);	/* (re)load the mcast table */
1689 	}
1690 }
1691 
1692 /* Trigger a transmit start, assuming the length is valid.
1693    Always called with the page lock held */
1694 
1695 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1696 								int start_page)
1697 {
1698 	long e8390_base = dev->base_addr;
1699  	struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev);
1700 
1701 	if (inb_p(e8390_base) & E8390_TRANS)
1702 	{
1703 		netdev_warn(dev, "trigger_send() called with the transmitter busy\n");
1704 		return;
1705 	}
1706 	outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1707 	outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1708 	outb_p(start_page, e8390_base + EN0_TPSR);
1709 	outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1710 }
1711