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