Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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

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