Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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 typedef struct axnet_dev_t {
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 } axnet_dev_t;
122 
123 static inline axnet_dev_t *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     axnet_dev_t *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(axnet_dev_t));
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     axnet_dev_t *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         axnet_dev_t *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     axnet_dev_t *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     init_timer(&info->watchdog);
488     info->watchdog.function = ei_watchdog;
489     info->watchdog.data = (u_long)dev;
490     info->watchdog.expires = jiffies + HZ;
491     add_timer(&info->watchdog);
492 
493     return ax_open(dev);
494 } /* axnet_open */
495 
496 /*====================================================================*/
497 
498 static int axnet_close(struct net_device *dev)
499 {
500     axnet_dev_t *info = PRIV(dev);
501     struct pcmcia_device *link = info->p_dev;
502 
503     dev_dbg(&link->dev, "axnet_close('%s')\n", dev->name);
504 
505     ax_close(dev);
506     free_irq(dev->irq, dev);
507     
508     link->open--;
509     netif_stop_queue(dev);
510     del_timer_sync(&info->watchdog);
511 
512     return 0;
513 } /* axnet_close */
514 
515 /*======================================================================
516 
517     Hard reset the card.  This used to pause for the same period that
518     a 8390 reset command required, but that shouldn't be necessary.
519 
520 ======================================================================*/
521 
522 static void axnet_reset_8390(struct net_device *dev)
523 {
524     unsigned int nic_base = dev->base_addr;
525     int i;
526 
527     ei_status.txing = ei_status.dmaing = 0;
528 
529     outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, nic_base + E8390_CMD);
530 
531     outb(inb(nic_base + AXNET_RESET), nic_base + AXNET_RESET);
532 
533     for (i = 0; i < 100; i++) {
534         if ((inb_p(nic_base+EN0_ISR) & ENISR_RESET) != 0)
535             break;
536         udelay(100);
537     }
538     outb_p(ENISR_RESET, nic_base + EN0_ISR); /* Ack intr. */
539     
540     if (i == 100)
541         netdev_err(dev, "axnet_reset_8390() did not complete\n");
542     
543 } /* axnet_reset_8390 */
544 
545 /*====================================================================*/
546 
547 static irqreturn_t ei_irq_wrapper(int irq, void *dev_id)
548 {
549     struct net_device *dev = dev_id;
550     PRIV(dev)->stale = 0;
551     return ax_interrupt(irq, dev_id);
552 }
553 
554 static void ei_watchdog(u_long arg)
555 {
556     struct net_device *dev = (struct net_device *)(arg);
557     axnet_dev_t *info = PRIV(dev);
558     unsigned int nic_base = dev->base_addr;
559     unsigned int mii_addr = nic_base + AXNET_MII_EEP;
560     u_short link;
561 
562     if (!netif_device_present(dev)) goto reschedule;
563 
564     /* Check for pending interrupt with expired latency timer: with
565        this, we can limp along even if the interrupt is blocked */
566     if (info->stale++ && (inb_p(nic_base + EN0_ISR) & ENISR_ALL)) {
567         if (!info->fast_poll)
568             netdev_info(dev, "interrupt(s) dropped!\n");
569         ei_irq_wrapper(dev->irq, dev);
570         info->fast_poll = HZ;
571     }
572     if (info->fast_poll) {
573         info->fast_poll--;
574         info->watchdog.expires = jiffies + 1;
575         add_timer(&info->watchdog);
576         return;
577     }
578 
579     if (info->phy_id < 0)
580         goto reschedule;
581     link = mdio_read(mii_addr, info->phy_id, 1);
582     if (!link || (link == 0xffff)) {
583         netdev_info(dev, "MII is missing!\n");
584         info->phy_id = -1;
585         goto reschedule;
586     }
587 
588     link &= 0x0004;
589     if (link != info->link_status) {
590         u_short p = mdio_read(mii_addr, info->phy_id, 5);
591         netdev_info(dev, "%s link beat\n", link ? "found" : "lost");
592         if (link) {
593             info->duplex_flag = (p & 0x0140) ? 0x80 : 0x00;
594             if (p)
595                 netdev_info(dev, "autonegotiation complete: %dbaseT-%cD selected\n",
596                             (p & 0x0180) ? 100 : 10, (p & 0x0140) ? 'F' : 'H');
597             else
598                 netdev_info(dev, "link partner did not autonegotiate\n");
599             AX88190_init(dev, 1);
600         }
601         info->link_status = link;
602     }
603 
604 reschedule:
605     info->watchdog.expires = jiffies + HZ;
606     add_timer(&info->watchdog);
607 }
608 
609 /*====================================================================*/
610 
611 static int axnet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
612 {
613     axnet_dev_t *info = PRIV(dev);
614     struct mii_ioctl_data *data = if_mii(rq);
615     unsigned int mii_addr = dev->base_addr + AXNET_MII_EEP;
616     switch (cmd) {
617     case SIOCGMIIPHY:
618         data->phy_id = info->phy_id;
619     case SIOCGMIIREG:           /* Read MII PHY register. */
620         data->val_out = mdio_read(mii_addr, data->phy_id, data->reg_num & 0x1f);
621         return 0;
622     case SIOCSMIIREG:           /* Write MII PHY register. */
623         mdio_write(mii_addr, data->phy_id, data->reg_num & 0x1f, data->val_in);
624         return 0;
625     }
626     return -EOPNOTSUPP;
627 }
628 
629 /*====================================================================*/
630 
631 static void get_8390_hdr(struct net_device *dev,
632                          struct e8390_pkt_hdr *hdr,
633                          int ring_page)
634 {
635     unsigned int nic_base = dev->base_addr;
636 
637     outb_p(0, nic_base + EN0_RSARLO);           /* On page boundary */
638     outb_p(ring_page, nic_base + EN0_RSARHI);
639     outb_p(E8390_RREAD+E8390_START, nic_base + AXNET_CMD);
640 
641     insw(nic_base + AXNET_DATAPORT, hdr,
642             sizeof(struct e8390_pkt_hdr)>>1);
643     /* Fix for big endian systems */
644     hdr->count = le16_to_cpu(hdr->count);
645 
646 }
647 
648 /*====================================================================*/
649 
650 static void block_input(struct net_device *dev, int count,
651                         struct sk_buff *skb, int ring_offset)
652 {
653     unsigned int nic_base = dev->base_addr;
654     struct ei_device *ei_local = netdev_priv(dev);
655     int xfer_count = count;
656     char *buf = skb->data;
657 
658     if ((netif_msg_rx_status(ei_local)) && (count != 4))
659         netdev_dbg(dev, "[bi=%d]\n", count+4);
660     outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
661     outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
662     outb_p(E8390_RREAD+E8390_START, nic_base + AXNET_CMD);
663 
664     insw(nic_base + AXNET_DATAPORT,buf,count>>1);
665     if (count & 0x01)
666         buf[count-1] = inb(nic_base + AXNET_DATAPORT), xfer_count++;
667 
668 }
669 
670 /*====================================================================*/
671 
672 static void block_output(struct net_device *dev, int count,
673                          const u_char *buf, const int start_page)
674 {
675     unsigned int nic_base = dev->base_addr;
676 
677     pr_debug("%s: [bo=%d]\n", dev->name, count);
678 
679     /* Round the count up for word writes.  Do we need to do this?
680        What effect will an odd byte count have on the 8390?
681        I should check someday. */
682     if (count & 0x01)
683         count++;
684 
685     outb_p(0x00, nic_base + EN0_RSARLO);
686     outb_p(start_page, nic_base + EN0_RSARHI);
687     outb_p(E8390_RWRITE+E8390_START, nic_base + AXNET_CMD);
688     outsw(nic_base + AXNET_DATAPORT, buf, count>>1);
689 }
690 
691 static const struct pcmcia_device_id axnet_ids[] = {
692         PCMCIA_PFC_DEVICE_MANF_CARD(0, 0x016c, 0x0081),
693         PCMCIA_DEVICE_MANF_CARD(0x018a, 0x0301),
694         PCMCIA_DEVICE_MANF_CARD(0x01bf, 0x2328),
695         PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0301),
696         PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0303),
697         PCMCIA_DEVICE_MANF_CARD(0x026f, 0x0309),
698         PCMCIA_DEVICE_MANF_CARD(0x0274, 0x1106),
699         PCMCIA_DEVICE_MANF_CARD(0x8a01, 0xc1ab),
700         PCMCIA_DEVICE_MANF_CARD(0x021b, 0x0202), 
701         PCMCIA_DEVICE_MANF_CARD(0xffff, 0x1090),
702         PCMCIA_DEVICE_PROD_ID12("AmbiCom,Inc.", "Fast Ethernet PC Card(AMB8110)", 0x49b020a7, 0x119cc9fc),
703         PCMCIA_DEVICE_PROD_ID124("Fast Ethernet", "16-bit PC Card", "AX88190", 0xb4be14e3, 0x9a12eb6a, 0xab9be5ef),
704         PCMCIA_DEVICE_PROD_ID12("ASIX", "AX88190", 0x0959823b, 0xab9be5ef),
705         PCMCIA_DEVICE_PROD_ID12("Billionton", "LNA-100B", 0x552ab682, 0xbc3b87e1),
706         PCMCIA_DEVICE_PROD_ID12("CHEETAH ETHERCARD", "EN2228", 0x00fa7bc8, 0x00e990cc),
707         PCMCIA_DEVICE_PROD_ID12("CNet", "CNF301", 0xbc477dde, 0x78c5f40b),
708         PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEther PCC-TXD", 0x5261440f, 0x436768c5),
709         PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEtherII PCC-TXD", 0x5261440f, 0x730df72e),
710         PCMCIA_DEVICE_PROD_ID12("corega K.K.", "corega FEther PCC-TXM", 0x5261440f, 0x3abbd061),
711         PCMCIA_DEVICE_PROD_ID12("Dynalink", "L100C16", 0x55632fd5, 0x66bc2a90),
712         PCMCIA_DEVICE_PROD_ID12("IO DATA", "ETXPCM", 0x547e66dc, 0x233adac2),
713         PCMCIA_DEVICE_PROD_ID12("Linksys", "EtherFast 10/100 PC Card (PCMPC100 V3)", 0x0733cc81, 0x232019a8),
714         PCMCIA_DEVICE_PROD_ID12("MELCO", "LPC3-TX", 0x481e0094, 0xf91af609),
715         PCMCIA_DEVICE_PROD_ID12("NETGEAR", "FA411", 0x9aa79dc3, 0x40fad875),
716         PCMCIA_DEVICE_PROD_ID12("PCMCIA", "100BASE", 0x281f1c5d, 0x7c2add04),
717         PCMCIA_DEVICE_PROD_ID12("PCMCIA", "FastEtherCard", 0x281f1c5d, 0x7ef26116),
718         PCMCIA_DEVICE_PROD_ID12("PCMCIA", "FEP501", 0x281f1c5d, 0x2e272058),
719         PCMCIA_DEVICE_PROD_ID14("Network Everywhere", "AX88190", 0x820a67b6,  0xab9be5ef),
720         PCMCIA_DEVICE_NULL,
721 };
722 MODULE_DEVICE_TABLE(pcmcia, axnet_ids);
723 
724 static struct pcmcia_driver axnet_cs_driver = {
725         .owner          = THIS_MODULE,
726         .name           = "axnet_cs",
727         .probe          = axnet_probe,
728         .remove         = axnet_detach,
729         .id_table       = axnet_ids,
730         .suspend        = axnet_suspend,
731         .resume         = axnet_resume,
732 };
733 module_pcmcia_driver(axnet_cs_driver);
734 
735 /*====================================================================*/
736 
737 /* 8390.c: A general NS8390 ethernet driver core for linux. */
738 /*
739         Written 1992-94 by Donald Becker.
740   
741         Copyright 1993 United States Government as represented by the
742         Director, National Security Agency.
743 
744         This software may be used and distributed according to the terms
745         of the GNU General Public License, incorporated herein by reference.
746 
747         The author may be reached as becker@scyld.com, or C/O
748         Scyld Computing Corporation
749         410 Severn Ave., Suite 210
750         Annapolis MD 21403
751 
752   This is the chip-specific code for many 8390-based ethernet adaptors.
753   This is not a complete driver, it must be combined with board-specific
754   code such as ne.c, wd.c, 3c503.c, etc.
755 
756   Seeing how at least eight drivers use this code, (not counting the
757   PCMCIA ones either) it is easy to break some card by what seems like
758   a simple innocent change. Please contact me or Donald if you think
759   you have found something that needs changing. -- PG
760 
761   Changelog:
762 
763   Paul Gortmaker        : remove set_bit lock, other cleanups.
764   Paul Gortmaker        : add ei_get_8390_hdr() so we can pass skb's to 
765                           ei_block_input() for eth_io_copy_and_sum().
766   Paul Gortmaker        : exchange static int ei_pingpong for a #define,
767                           also add better Tx error handling.
768   Paul Gortmaker        : rewrite Rx overrun handling as per NS specs.
769   Alexey Kuznetsov      : use the 8390's six bit hash multicast filter.
770   Paul Gortmaker        : tweak ANK's above multicast changes a bit.
771   Paul Gortmaker        : update packet statistics for v2.1.x
772   Alan Cox              : support arbitrary stupid port mappings on the
773                           68K Macintosh. Support >16bit I/O spaces
774   Paul Gortmaker        : add kmod support for auto-loading of the 8390
775                           module by all drivers that require it.
776   Alan Cox              : Spinlocking work, added 'BUG_83C690'
777   Paul Gortmaker        : Separate out Tx timeout code from Tx path.
778 
779   Sources:
780   The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
781 
782   */
783 
784 #include <linux/bitops.h>
785 #include <asm/irq.h>
786 #include <linux/fcntl.h>
787 #include <linux/in.h>
788 #include <linux/interrupt.h>
789 
790 #define BUG_83C690
791 
792 /* These are the operational function interfaces to board-specific
793    routines.
794         void reset_8390(struct net_device *dev)
795                 Resets the board associated with DEV, including a hardware reset of
796                 the 8390.  This is only called when there is a transmit timeout, and
797                 it is always followed by 8390_init().
798         void block_output(struct net_device *dev, int count, const unsigned char *buf,
799                                           int start_page)
800                 Write the COUNT bytes of BUF to the packet buffer at START_PAGE.  The
801                 "page" value uses the 8390's 256-byte pages.
802         void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page)
803                 Read the 4 byte, page aligned 8390 header. *If* there is a
804                 subsequent read, it will be of the rest of the packet.
805         void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
806                 Read COUNT bytes from the packet buffer into the skb data area. Start 
807                 reading from RING_OFFSET, the address as the 8390 sees it.  This will always
808                 follow the read of the 8390 header. 
809 */
810 #define ei_reset_8390 (ei_local->reset_8390)
811 #define ei_block_output (ei_local->block_output)
812 #define ei_block_input (ei_local->block_input)
813 #define ei_get_8390_hdr (ei_local->get_8390_hdr)
814 
815 /* Index to functions. */
816 static void ei_tx_intr(struct net_device *dev);
817 static void ei_tx_err(struct net_device *dev);
818 static void ei_receive(struct net_device *dev);
819 static void ei_rx_overrun(struct net_device *dev);
820 
821 /* Routines generic to NS8390-based boards. */
822 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
823                                                                 int start_page);
824 static void do_set_multicast_list(struct net_device *dev);
825 
826 /*
827  *      SMP and the 8390 setup.
828  *
829  *      The 8390 isn't exactly designed to be multithreaded on RX/TX. There is
830  *      a page register that controls bank and packet buffer access. We guard
831  *      this with ei_local->page_lock. Nobody should assume or set the page other
832  *      than zero when the lock is not held. Lock holders must restore page 0
833  *      before unlocking. Even pure readers must take the lock to protect in 
834  *      page 0.
835  *
836  *      To make life difficult the chip can also be very slow. We therefore can't
837  *      just use spinlocks. For the longer lockups we disable the irq the device
838  *      sits on and hold the lock. We must hold the lock because there is a dual
839  *      processor case other than interrupts (get stats/set multicast list in
840  *      parallel with each other and transmit).
841  *
842  *      Note: in theory we can just disable the irq on the card _but_ there is
843  *      a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
844  *      enter lock, take the queued irq. So we waddle instead of flying.
845  *
846  *      Finally by special arrangement for the purpose of being generally 
847  *      annoying the transmit function is called bh atomic. That places
848  *      restrictions on the user context callers as disable_irq won't save
849  *      them.
850  */
851  
852 /**
853  * ax_open - Open/initialize the board.
854  * @dev: network device to initialize
855  *
856  * This routine goes all-out, setting everything
857  * up anew at each open, even though many of these registers should only
858  * need to be set once at boot.
859  */
860 static int ax_open(struct net_device *dev)
861 {
862         unsigned long flags;
863         struct ei_device *ei_local = netdev_priv(dev);
864 
865         /*
866          *      Grab the page lock so we own the register set, then call
867          *      the init function.
868          */
869       
870         spin_lock_irqsave(&ei_local->page_lock, flags);
871         AX88190_init(dev, 1);
872         /* Set the flag before we drop the lock, That way the IRQ arrives
873            after its set and we get no silly warnings */
874         netif_start_queue(dev);
875         spin_unlock_irqrestore(&ei_local->page_lock, flags);
876         ei_local->irqlock = 0;
877         return 0;
878 }
879 
880 #define dev_lock(dev) (((struct ei_device *)netdev_priv(dev))->page_lock)
881 
882 /**
883  * ax_close - shut down network device
884  * @dev: network device to close
885  *
886  * Opposite of ax_open(). Only used when "ifconfig <devname> down" is done.
887  */
888 static int ax_close(struct net_device *dev)
889 {
890         unsigned long flags;
891 
892         /*
893          *      Hold the page lock during close
894          */
895 
896         spin_lock_irqsave(&dev_lock(dev), flags);
897         AX88190_init(dev, 0);
898         spin_unlock_irqrestore(&dev_lock(dev), flags);
899         netif_stop_queue(dev);
900         return 0;
901 }
902 
903 /**
904  * axnet_tx_timeout - handle transmit time out condition
905  * @dev: network device which has apparently fallen asleep
906  *
907  * Called by kernel when device never acknowledges a transmit has
908  * completed (or failed) - i.e. never posted a Tx related interrupt.
909  */
910 
911 static void axnet_tx_timeout(struct net_device *dev)
912 {
913         long e8390_base = dev->base_addr;
914         struct ei_device *ei_local = netdev_priv(dev);
915         int txsr, isr, tickssofar = jiffies - dev_trans_start(dev);
916         unsigned long flags;
917 
918         dev->stats.tx_errors++;
919 
920         spin_lock_irqsave(&ei_local->page_lock, flags);
921         txsr = inb(e8390_base+EN0_TSR);
922         isr = inb(e8390_base+EN0_ISR);
923         spin_unlock_irqrestore(&ei_local->page_lock, flags);
924 
925         netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
926                    (txsr & ENTSR_ABT) ? "excess collisions." :
927                    (isr) ? "lost interrupt?" : "cable problem?",
928                    txsr, isr, tickssofar);
929 
930         if (!isr && !dev->stats.tx_packets) 
931         {
932                 /* The 8390 probably hasn't gotten on the cable yet. */
933                 ei_local->interface_num ^= 1;   /* Try a different xcvr.  */
934         }
935 
936         /* Ugly but a reset can be slow, yet must be protected */
937                 
938         spin_lock_irqsave(&ei_local->page_lock, flags);
939                 
940         /* Try to restart the card.  Perhaps the user has fixed something. */
941         ei_reset_8390(dev);
942         AX88190_init(dev, 1);
943                 
944         spin_unlock_irqrestore(&ei_local->page_lock, flags);
945         netif_wake_queue(dev);
946 }
947     
948 /**
949  * axnet_start_xmit - begin packet transmission
950  * @skb: packet to be sent
951  * @dev: network device to which packet is sent
952  *
953  * Sends a packet to an 8390 network device.
954  */
955  
956 static netdev_tx_t axnet_start_xmit(struct sk_buff *skb,
957                                           struct net_device *dev)
958 {
959         long e8390_base = dev->base_addr;
960         struct ei_device *ei_local = netdev_priv(dev);
961         int length, send_length, output_page;
962         unsigned long flags;
963         u8 packet[ETH_ZLEN];
964         
965         netif_stop_queue(dev);
966 
967         length = skb->len;
968 
969         /* Mask interrupts from the ethercard. 
970            SMP: We have to grab the lock here otherwise the IRQ handler
971            on another CPU can flip window and race the IRQ mask set. We end
972            up trashing the mcast filter not disabling irqs if we don't lock */
973            
974         spin_lock_irqsave(&ei_local->page_lock, flags);
975         outb_p(0x00, e8390_base + EN0_IMR);
976         
977         /*
978          *      Slow phase with lock held.
979          */
980          
981         ei_local->irqlock = 1;
982 
983         send_length = max(length, ETH_ZLEN);
984 
985         /*
986          * We have two Tx slots available for use. Find the first free
987          * slot, and then perform some sanity checks. With two Tx bufs,
988          * you get very close to transmitting back-to-back packets. With
989          * only one Tx buf, the transmitter sits idle while you reload the
990          * card, leaving a substantial gap between each transmitted packet.
991          */
992 
993         if (ei_local->tx1 == 0) 
994         {
995                 output_page = ei_local->tx_start_page;
996                 ei_local->tx1 = send_length;
997                 if ((netif_msg_tx_queued(ei_local)) &&
998                     ei_local->tx2 > 0)
999                         netdev_dbg(dev,
1000                                    "idle transmitter tx2=%d, lasttx=%d, txing=%d\n",
1001                                    ei_local->tx2, ei_local->lasttx,
1002                                    ei_local->txing);
1003         }
1004         else if (ei_local->tx2 == 0) 
1005         {
1006                 output_page = ei_local->tx_start_page + TX_PAGES/2;
1007                 ei_local->tx2 = send_length;
1008                 if ((netif_msg_tx_queued(ei_local)) &&
1009                     ei_local->tx1 > 0)
1010                         netdev_dbg(dev,
1011                                    "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n",
1012                                    ei_local->tx1, ei_local->lasttx,
1013                                    ei_local->txing);
1014         }
1015         else
1016         {       /* We should never get here. */
1017                 netif_dbg(ei_local, tx_err, dev,
1018                           "No Tx buffers free! tx1=%d tx2=%d last=%d\n",
1019                           ei_local->tx1, ei_local->tx2,
1020                           ei_local->lasttx);
1021                 ei_local->irqlock = 0;
1022                 netif_stop_queue(dev);
1023                 outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1024                 spin_unlock_irqrestore(&ei_local->page_lock, flags);
1025                 dev->stats.tx_errors++;
1026                 return NETDEV_TX_BUSY;
1027         }
1028 
1029         /*
1030          * Okay, now upload the packet and trigger a send if the transmitter
1031          * isn't already sending. If it is busy, the interrupt handler will
1032          * trigger the send later, upon receiving a Tx done interrupt.
1033          */
1034 
1035         if (length == skb->len)
1036                 ei_block_output(dev, length, skb->data, output_page);
1037         else {
1038                 memset(packet, 0, ETH_ZLEN);
1039                 skb_copy_from_linear_data(skb, packet, skb->len);
1040                 ei_block_output(dev, length, packet, output_page);
1041         }
1042         
1043         if (! ei_local->txing) 
1044         {
1045                 ei_local->txing = 1;
1046                 NS8390_trigger_send(dev, send_length, output_page);
1047                 dev->trans_start = jiffies;
1048                 if (output_page == ei_local->tx_start_page) 
1049                 {
1050                         ei_local->tx1 = -1;
1051                         ei_local->lasttx = -1;
1052                 }
1053                 else 
1054                 {
1055                         ei_local->tx2 = -1;
1056                         ei_local->lasttx = -2;
1057                 }
1058         }
1059         else ei_local->txqueue++;
1060 
1061         if (ei_local->tx1  &&  ei_local->tx2)
1062                 netif_stop_queue(dev);
1063         else
1064                 netif_start_queue(dev);
1065 
1066         /* Turn 8390 interrupts back on. */
1067         ei_local->irqlock = 0;
1068         outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1069         
1070         spin_unlock_irqrestore(&ei_local->page_lock, flags);
1071 
1072         dev_kfree_skb (skb);
1073         dev->stats.tx_bytes += send_length;
1074     
1075         return NETDEV_TX_OK;
1076 }
1077 
1078 /**
1079  * ax_interrupt - handle the interrupts from an 8390
1080  * @irq: interrupt number
1081  * @dev_id: a pointer to the net_device
1082  *
1083  * Handle the ether interface interrupts. We pull packets from
1084  * the 8390 via the card specific functions and fire them at the networking
1085  * stack. We also handle transmit completions and wake the transmit path if
1086  * necessary. We also update the counters and do other housekeeping as
1087  * needed.
1088  */
1089 
1090 static irqreturn_t ax_interrupt(int irq, void *dev_id)
1091 {
1092         struct net_device *dev = dev_id;
1093         long e8390_base;
1094         int interrupts, nr_serviced = 0, i;
1095         struct ei_device *ei_local;
1096         int handled = 0;
1097         unsigned long flags;
1098 
1099         e8390_base = dev->base_addr;
1100         ei_local = netdev_priv(dev);
1101 
1102         /*
1103          *      Protect the irq test too.
1104          */
1105          
1106         spin_lock_irqsave(&ei_local->page_lock, flags);
1107 
1108         if (ei_local->irqlock) {
1109 #if 1 /* This might just be an interrupt for a PCI device sharing this line */
1110                 const char *msg;
1111                 /* The "irqlock" check is only for testing. */
1112                 if (ei_local->irqlock)
1113                         msg = "Interrupted while interrupts are masked!";
1114                 else
1115                         msg = "Reentering the interrupt handler!";
1116                 netdev_info(dev, "%s, isr=%#2x imr=%#2x\n",
1117                             msg,
1118                             inb_p(e8390_base + EN0_ISR),
1119                             inb_p(e8390_base + EN0_IMR));
1120 #endif
1121                 spin_unlock_irqrestore(&ei_local->page_lock, flags);
1122                 return IRQ_NONE;
1123         }
1124 
1125         netif_dbg(ei_local, intr, dev, "interrupt(isr=%#2.2x)\n",
1126                   inb_p(e8390_base + EN0_ISR));
1127 
1128         outb_p(0x00, e8390_base + EN0_ISR);
1129         ei_local->irqlock = 1;
1130    
1131         /* !!Assumption!! -- we stay in page 0.  Don't break this. */
1132         while ((interrupts = inb_p(e8390_base + EN0_ISR)) != 0 &&
1133                ++nr_serviced < MAX_SERVICE)
1134         {
1135                 if (!netif_running(dev) || (interrupts == 0xff)) {
1136                         netif_warn(ei_local, intr, dev,
1137                                    "interrupt from stopped card\n");
1138                         outb_p(interrupts, e8390_base + EN0_ISR);
1139                         interrupts = 0;
1140                         break;
1141                 }
1142                 handled = 1;
1143 
1144                 /* AX88190 bug fix. */
1145                 outb_p(interrupts, e8390_base + EN0_ISR);
1146                 for (i = 0; i < 10; i++) {
1147                         if (!(inb(e8390_base + EN0_ISR) & interrupts))
1148                                 break;
1149                         outb_p(0, e8390_base + EN0_ISR);
1150                         outb_p(interrupts, e8390_base + EN0_ISR);
1151                 }
1152                 if (interrupts & ENISR_OVER) 
1153                         ei_rx_overrun(dev);
1154                 else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) 
1155                 {
1156                         /* Got a good (?) packet. */
1157                         ei_receive(dev);
1158                 }
1159                 /* Push the next to-transmit packet through. */
1160                 if (interrupts & ENISR_TX)
1161                         ei_tx_intr(dev);
1162                 else if (interrupts & ENISR_TX_ERR)
1163                         ei_tx_err(dev);
1164 
1165                 if (interrupts & ENISR_COUNTERS) 
1166                 {
1167                         dev->stats.rx_frame_errors += inb_p(e8390_base + EN0_COUNTER0);
1168                         dev->stats.rx_crc_errors   += inb_p(e8390_base + EN0_COUNTER1);
1169                         dev->stats.rx_missed_errors+= inb_p(e8390_base + EN0_COUNTER2);
1170                 }
1171         }
1172     
1173         if (interrupts && (netif_msg_intr(ei_local)))
1174         {
1175                 handled = 1;
1176                 if (nr_serviced >= MAX_SERVICE) 
1177                 {
1178                         /* 0xFF is valid for a card removal */
1179                         if (interrupts != 0xFF)
1180                                 netdev_warn(dev,
1181                                             "Too much work at interrupt, status %#2.2x\n",
1182                                             interrupts);
1183                         outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
1184                 } else {
1185                         netdev_warn(dev, "unknown interrupt %#2x\n",
1186                                     interrupts);
1187                         outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
1188                 }
1189         }
1190 
1191         /* Turn 8390 interrupts back on. */
1192         ei_local->irqlock = 0;
1193         outb_p(ENISR_ALL, e8390_base + EN0_IMR);
1194 
1195         spin_unlock_irqrestore(&ei_local->page_lock, flags);
1196         return IRQ_RETVAL(handled);
1197 }
1198 
1199 /**
1200  * ei_tx_err - handle transmitter error
1201  * @dev: network device which threw the exception
1202  *
1203  * A transmitter error has happened. Most likely excess collisions (which
1204  * is a fairly normal condition). If the error is one where the Tx will
1205  * have been aborted, we try and send another one right away, instead of
1206  * letting the failed packet sit and collect dust in the Tx buffer. This
1207  * is a much better solution as it avoids kernel based Tx timeouts, and
1208  * an unnecessary card reset.
1209  *
1210  * Called with lock held.
1211  */
1212 
1213 static void ei_tx_err(struct net_device *dev)
1214 {
1215         long e8390_base = dev->base_addr;
1216         unsigned char txsr = inb_p(e8390_base+EN0_TSR);
1217         unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
1218 
1219 #ifdef VERBOSE_ERROR_DUMP
1220         netdev_dbg(dev, "transmitter error (%#2x):", txsr);
1221         if (txsr & ENTSR_ABT)
1222                 pr_cont(" excess-collisions");
1223         if (txsr & ENTSR_ND)
1224                 pr_cont(" non-deferral");
1225         if (txsr & ENTSR_CRS)
1226                 pr_cont(" lost-carrier");
1227         if (txsr & ENTSR_FU)
1228                 pr_cont(" FIFO-underrun");
1229         if (txsr & ENTSR_CDH)
1230                 pr_cont(" lost-heartbeat");
1231         pr_cont("\n");
1232 #endif
1233 
1234         if (tx_was_aborted)
1235                 ei_tx_intr(dev);
1236         else 
1237         {
1238                 dev->stats.tx_errors++;
1239                 if (txsr & ENTSR_CRS) dev->stats.tx_carrier_errors++;
1240                 if (txsr & ENTSR_CDH) dev->stats.tx_heartbeat_errors++;
1241                 if (txsr & ENTSR_OWC) dev->stats.tx_window_errors++;
1242         }
1243 }
1244 
1245 /**
1246  * ei_tx_intr - transmit interrupt handler
1247  * @dev: network device for which tx intr is handled
1248  *
1249  * We have finished a transmit: check for errors and then trigger the next
1250  * packet to be sent. Called with lock held.
1251  */
1252 
1253 static void ei_tx_intr(struct net_device *dev)
1254 {
1255         long e8390_base = dev->base_addr;
1256         struct ei_device *ei_local = netdev_priv(dev);
1257         int status = inb(e8390_base + EN0_TSR);
1258     
1259         /*
1260          * There are two Tx buffers, see which one finished, and trigger
1261          * the send of another one if it exists.
1262          */
1263         ei_local->txqueue--;
1264 
1265         if (ei_local->tx1 < 0) 
1266         {
1267                 if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
1268                         netdev_err(dev, "%s: bogus last_tx_buffer %d, tx1=%d\n",
1269                                    ei_local->name, ei_local->lasttx,
1270                                    ei_local->tx1);
1271                 ei_local->tx1 = 0;
1272                 if (ei_local->tx2 > 0) 
1273                 {
1274                         ei_local->txing = 1;
1275                         NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
1276                         dev->trans_start = jiffies;
1277                         ei_local->tx2 = -1,
1278                         ei_local->lasttx = 2;
1279                 }
1280                 else ei_local->lasttx = 20, ei_local->txing = 0;        
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                         dev->trans_start = jiffies;
1294                         ei_local->tx1 = -1;
1295                         ei_local->lasttx = 1;
1296                 }
1297                 else
1298                         ei_local->lasttx = 10, ei_local->txing = 0;
1299         }
1300 //      else
1301 //              netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n",
1302 //                          ei_local->lasttx);
1303 
1304         /* Minimize Tx latency: update the statistics after we restart TXing. */
1305         if (status & ENTSR_COL)
1306                 dev->stats.collisions++;
1307         if (status & ENTSR_PTX)
1308                 dev->stats.tx_packets++;
1309         else 
1310         {
1311                 dev->stats.tx_errors++;
1312                 if (status & ENTSR_ABT) 
1313                 {
1314                         dev->stats.tx_aborted_errors++;
1315                         dev->stats.collisions += 16;
1316                 }
1317                 if (status & ENTSR_CRS) 
1318                         dev->stats.tx_carrier_errors++;
1319                 if (status & ENTSR_FU) 
1320                         dev->stats.tx_fifo_errors++;
1321                 if (status & ENTSR_CDH)
1322                         dev->stats.tx_heartbeat_errors++;
1323                 if (status & ENTSR_OWC)
1324                         dev->stats.tx_window_errors++;
1325         }
1326         netif_wake_queue(dev);
1327 }
1328 
1329 /**
1330  * ei_receive - receive some packets
1331  * @dev: network device with which receive will be run
1332  *
1333  * We have a good packet(s), get it/them out of the buffers. 
1334  * Called with lock held.
1335  */
1336 
1337 static void ei_receive(struct net_device *dev)
1338 {
1339         long e8390_base = dev->base_addr;
1340         struct ei_device *ei_local = netdev_priv(dev);
1341         unsigned char rxing_page, this_frame, next_frame;
1342         unsigned short current_offset;
1343         int rx_pkt_count = 0;
1344         struct e8390_pkt_hdr rx_frame;
1345     
1346         while (++rx_pkt_count < 10) 
1347         {
1348                 int pkt_len, pkt_stat;
1349                 
1350                 /* Get the rx page (incoming packet pointer). */
1351                 rxing_page = inb_p(e8390_base + EN1_CURPAG -1);
1352                 
1353                 /* Remove one frame from the ring.  Boundary is always a page behind. */
1354                 this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1;
1355                 if (this_frame >= ei_local->stop_page)
1356                         this_frame = ei_local->rx_start_page;
1357                 
1358                 /* Someday we'll omit the previous, iff we never get this message.
1359                    (There is at least one clone claimed to have a problem.)  
1360                    
1361                    Keep quiet if it looks like a card removal. One problem here
1362                    is that some clones crash in roughly the same way.
1363                  */
1364                 if ((netif_msg_rx_err(ei_local)) &&
1365                     this_frame != ei_local->current_page &&
1366                     (this_frame != 0x0 || rxing_page != 0xFF))
1367                         netdev_err(dev, "mismatched read page pointers %2x vs %2x\n",
1368                                    this_frame, ei_local->current_page);
1369                 
1370                 if (this_frame == rxing_page)   /* Read all the frames? */
1371                         break;                          /* Done for now */
1372                 
1373                 current_offset = this_frame << 8;
1374                 ei_get_8390_hdr(dev, &rx_frame, this_frame);
1375                 
1376                 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
1377                 pkt_stat = rx_frame.status;
1378                 
1379                 next_frame = this_frame + 1 + ((pkt_len+4)>>8);
1380                 
1381                 if (pkt_len < 60  ||  pkt_len > 1518) 
1382                 {
1383                         netif_err(ei_local, rx_err, dev,
1384                                   "bogus packet size: %d, status=%#2x nxpg=%#2x\n",
1385                                   rx_frame.count, rx_frame.status,
1386                                   rx_frame.next);
1387                         dev->stats.rx_errors++;
1388                         dev->stats.rx_length_errors++;
1389                 }
1390                  else if ((pkt_stat & 0x0F) == ENRSR_RXOK) 
1391                 {
1392                         struct sk_buff *skb;
1393                         
1394                         skb = netdev_alloc_skb(dev, pkt_len + 2);
1395                         if (skb == NULL) 
1396                         {
1397                                 netif_err(ei_local, rx_err, dev,
1398                                           "Couldn't allocate a sk_buff of size %d\n",
1399                                           pkt_len);
1400                                 dev->stats.rx_dropped++;
1401                                 break;
1402                         }
1403                         else
1404                         {
1405                                 skb_reserve(skb,2);     /* IP headers on 16 byte boundaries */
1406                                 skb_put(skb, pkt_len);  /* Make room */
1407                                 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
1408                                 skb->protocol=eth_type_trans(skb,dev);
1409                                 netif_rx(skb);
1410                                 dev->stats.rx_packets++;
1411                                 dev->stats.rx_bytes += pkt_len;
1412                                 if (pkt_stat & ENRSR_PHY)
1413                                         dev->stats.multicast++;
1414                         }
1415                 } 
1416                 else 
1417                 {
1418                         netif_err(ei_local, rx_err, dev,
1419                                   "bogus packet: status=%#2x nxpg=%#2x size=%d\n",
1420                                   rx_frame.status, rx_frame.next,
1421                                   rx_frame.count);
1422                         dev->stats.rx_errors++;
1423                         /* NB: The NIC counts CRC, frame and missed errors. */
1424                         if (pkt_stat & ENRSR_FO)
1425                                 dev->stats.rx_fifo_errors++;
1426                 }
1427                 next_frame = rx_frame.next;
1428                 
1429                 /* This _should_ never happen: it's here for avoiding bad clones. */
1430                 if (next_frame >= ei_local->stop_page) {
1431                         netdev_info(dev, "next frame inconsistency, %#2x\n",
1432                                     next_frame);
1433                         next_frame = ei_local->rx_start_page;
1434                 }
1435                 ei_local->current_page = next_frame;
1436                 outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
1437         }
1438 }
1439 
1440 /**
1441  * ei_rx_overrun - handle receiver overrun
1442  * @dev: network device which threw exception
1443  *
1444  * We have a receiver overrun: we have to kick the 8390 to get it started
1445  * again. Problem is that you have to kick it exactly as NS prescribes in
1446  * the updated datasheets, or "the NIC may act in an unpredictable manner."
1447  * This includes causing "the NIC to defer indefinitely when it is stopped
1448  * on a busy network."  Ugh.
1449  * Called with lock held. Don't call this with the interrupts off or your
1450  * computer will hate you - it takes 10ms or so. 
1451  */
1452 
1453 static void ei_rx_overrun(struct net_device *dev)
1454 {
1455         axnet_dev_t *info = PRIV(dev);
1456         long e8390_base = dev->base_addr;
1457         unsigned char was_txing, must_resend = 0;
1458         struct ei_device *ei_local = netdev_priv(dev);
1459     
1460         /*
1461          * Record whether a Tx was in progress and then issue the
1462          * stop command.
1463          */
1464         was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
1465         outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1466 
1467         netif_dbg(ei_local, rx_err, dev, "Receiver overrun\n");
1468         dev->stats.rx_over_errors++;
1469     
1470         /* 
1471          * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
1472          * We wait at least 2ms.
1473          */
1474 
1475         mdelay(2);
1476 
1477         /*
1478          * Reset RBCR[01] back to zero as per magic incantation.
1479          */
1480         outb_p(0x00, e8390_base+EN0_RCNTLO);
1481         outb_p(0x00, e8390_base+EN0_RCNTHI);
1482 
1483         /*
1484          * See if any Tx was interrupted or not. According to NS, this
1485          * step is vital, and skipping it will cause no end of havoc.
1486          */
1487 
1488         if (was_txing)
1489         { 
1490                 unsigned char tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR);
1491                 if (!tx_completed)
1492                         must_resend = 1;
1493         }
1494 
1495         /*
1496          * Have to enter loopback mode and then restart the NIC before
1497          * you are allowed to slurp packets up off the ring.
1498          */
1499         outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
1500         outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
1501 
1502         /*
1503          * Clear the Rx ring of all the debris, and ack the interrupt.
1504          */
1505         ei_receive(dev);
1506 
1507         /*
1508          * Leave loopback mode, and resend any packet that got stopped.
1509          */
1510         outb_p(E8390_TXCONFIG | info->duplex_flag, e8390_base + EN0_TXCR); 
1511         if (must_resend)
1512                 outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
1513 }
1514 
1515 /*
1516  *      Collect the stats. This is called unlocked and from several contexts.
1517  */
1518  
1519 static struct net_device_stats *get_stats(struct net_device *dev)
1520 {
1521         long ioaddr = dev->base_addr;
1522         struct ei_device *ei_local = netdev_priv(dev);
1523         unsigned long flags;
1524     
1525         /* If the card is stopped, just return the present stats. */
1526         if (!netif_running(dev))
1527                 return &dev->stats;
1528 
1529         spin_lock_irqsave(&ei_local->page_lock,flags);
1530         /* Read the counter registers, assuming we are in page 0. */
1531         dev->stats.rx_frame_errors += inb_p(ioaddr + EN0_COUNTER0);
1532         dev->stats.rx_crc_errors   += inb_p(ioaddr + EN0_COUNTER1);
1533         dev->stats.rx_missed_errors+= inb_p(ioaddr + EN0_COUNTER2);
1534         spin_unlock_irqrestore(&ei_local->page_lock, flags);
1535     
1536         return &dev->stats;
1537 }
1538 
1539 /*
1540  * Form the 64 bit 8390 multicast table from the linked list of addresses
1541  * associated with this dev structure.
1542  */
1543  
1544 static inline void make_mc_bits(u8 *bits, struct net_device *dev)
1545 {
1546         struct netdev_hw_addr *ha;
1547         u32 crc;
1548 
1549         netdev_for_each_mc_addr(ha, dev) {
1550                 crc = ether_crc(ETH_ALEN, ha->addr);
1551                 /* 
1552                  * The 8390 uses the 6 most significant bits of the
1553                  * CRC to index the multicast table.
1554                  */
1555                 bits[crc>>29] |= (1<<((crc>>26)&7));
1556         }
1557 }
1558 
1559 /**
1560  * do_set_multicast_list - set/clear multicast filter
1561  * @dev: net device for which multicast filter is adjusted
1562  *
1563  *      Set or clear the multicast filter for this adaptor.
1564  *      Must be called with lock held. 
1565  */
1566  
1567 static void do_set_multicast_list(struct net_device *dev)
1568 {
1569         long e8390_base = dev->base_addr;
1570         int i;
1571         struct ei_device *ei_local = netdev_priv(dev);
1572 
1573         if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) {
1574                 memset(ei_local->mcfilter, 0, 8);
1575                 if (!netdev_mc_empty(dev))
1576                         make_mc_bits(ei_local->mcfilter, dev);
1577         } else {
1578                 /* set to accept-all */
1579                 memset(ei_local->mcfilter, 0xFF, 8);
1580         }
1581 
1582         outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
1583         for(i = 0; i < 8; i++) 
1584         {
1585                 outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
1586         }
1587         outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
1588 
1589         if(dev->flags&IFF_PROMISC)
1590                 outb_p(E8390_RXCONFIG | 0x58, e8390_base + EN0_RXCR);
1591         else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev))
1592                 outb_p(E8390_RXCONFIG | 0x48, e8390_base + EN0_RXCR);
1593         else
1594                 outb_p(E8390_RXCONFIG | 0x40, e8390_base + EN0_RXCR);
1595 
1596         outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1597 }
1598 
1599 /*
1600  *      Called without lock held. This is invoked from user context and may
1601  *      be parallel to just about everything else. Its also fairly quick and
1602  *      not called too often. Must protect against both bh and irq users
1603  */
1604 
1605 static void set_multicast_list(struct net_device *dev)
1606 {
1607         unsigned long flags;
1608 
1609         spin_lock_irqsave(&dev_lock(dev), flags);
1610         do_set_multicast_list(dev);
1611         spin_unlock_irqrestore(&dev_lock(dev), flags);
1612 }       
1613 
1614 /* This page of functions should be 8390 generic */
1615 /* Follow National Semi's recommendations for initializing the "NIC". */
1616 
1617 /**
1618  * AX88190_init - initialize 8390 hardware
1619  * @dev: network device to initialize
1620  * @startp: boolean.  non-zero value to initiate chip processing
1621  *
1622  *      Must be called with lock held.
1623  */
1624 
1625 static void AX88190_init(struct net_device *dev, int startp)
1626 {
1627         axnet_dev_t *info = PRIV(dev);
1628         long e8390_base = dev->base_addr;
1629         struct ei_device *ei_local = netdev_priv(dev);
1630         int i;
1631         int endcfg = ei_local->word16 ? (0x48 | ENDCFG_WTS) : 0x48;
1632     
1633         if(sizeof(struct e8390_pkt_hdr)!=4)
1634                 panic("8390.c: header struct mispacked\n");    
1635         /* Follow National Semi's recommendations for initing the DP83902. */
1636         outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
1637         outb_p(endcfg, e8390_base + EN0_DCFG);  /* 0x48 or 0x49 */
1638         /* Clear the remote byte count registers. */
1639         outb_p(0x00,  e8390_base + EN0_RCNTLO);
1640         outb_p(0x00,  e8390_base + EN0_RCNTHI);
1641         /* Set to monitor and loopback mode -- this is vital!. */
1642         outb_p(E8390_RXOFF|0x40, e8390_base + EN0_RXCR); /* 0x60 */
1643         outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
1644         /* Set the transmit page and receive ring. */
1645         outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
1646         ei_local->tx1 = ei_local->tx2 = 0;
1647         outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
1648         outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY);       /* 3c503 says 0x3f,NS0x26*/
1649         ei_local->current_page = ei_local->rx_start_page;               /* assert boundary+1 */
1650         outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
1651         /* Clear the pending interrupts and mask. */
1652         outb_p(0xFF, e8390_base + EN0_ISR);
1653         outb_p(0x00,  e8390_base + EN0_IMR);
1654     
1655         /* Copy the station address into the DS8390 registers. */
1656 
1657         outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
1658         for(i = 0; i < 6; i++) 
1659         {
1660                 outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
1661                 if(inb_p(e8390_base + EN1_PHYS_SHIFT(i))!=dev->dev_addr[i])
1662                         netdev_err(dev, "Hw. address read/write mismap %d\n", i);
1663         }
1664 
1665         outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
1666         outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
1667 
1668         netif_start_queue(dev);
1669         ei_local->tx1 = ei_local->tx2 = 0;
1670         ei_local->txing = 0;
1671 
1672         if (info->flags & IS_AX88790)   /* select Internal PHY */
1673                 outb(0x10, e8390_base + AXNET_GPIO);
1674 
1675         if (startp) 
1676         {
1677                 outb_p(0xff,  e8390_base + EN0_ISR);
1678                 outb_p(ENISR_ALL,  e8390_base + EN0_IMR);
1679                 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
1680                 outb_p(E8390_TXCONFIG | info->duplex_flag,
1681                        e8390_base + EN0_TXCR); /* xmit on. */
1682                 /* 3c503 TechMan says rxconfig only after the NIC is started. */
1683                 outb_p(E8390_RXCONFIG | 0x40, e8390_base + EN0_RXCR); /* rx on, */
1684                 do_set_multicast_list(dev);     /* (re)load the mcast table */
1685         }
1686 }
1687 
1688 /* Trigger a transmit start, assuming the length is valid. 
1689    Always called with the page lock held */
1690    
1691 static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
1692                                                                 int start_page)
1693 {
1694         long e8390_base = dev->base_addr;
1695         struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev);
1696     
1697         if (inb_p(e8390_base) & E8390_TRANS) 
1698         {
1699                 netdev_warn(dev, "trigger_send() called with the transmitter busy\n");
1700                 return;
1701         }
1702         outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
1703         outb_p(length >> 8, e8390_base + EN0_TCNTHI);
1704         outb_p(start_page, e8390_base + EN0_TPSR);
1705         outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
1706 }
1707 

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