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