Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

Linux/drivers/net/ethernet/8390/axnet_cs.c

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

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