Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17 3.18

Linux/drivers/net/wan/lmc/lmc_main.c

  1  /*
  2   * Copyright (c) 1997-2000 LAN Media Corporation (LMC)
  3   * All rights reserved.  www.lanmedia.com
  4   * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
  5   *
  6   * This code is written by:
  7   * Andrew Stanley-Jones (asj@cban.com)
  8   * Rob Braun (bbraun@vix.com),
  9   * Michael Graff (explorer@vix.com) and
 10   * Matt Thomas (matt@3am-software.com).
 11   *
 12   * With Help By:
 13   * David Boggs
 14   * Ron Crane
 15   * Alan Cox
 16   *
 17   * This software may be used and distributed according to the terms
 18   * of the GNU General Public License version 2, incorporated herein by reference.
 19   *
 20   * Driver for the LanMedia LMC5200, LMC5245, LMC1000, LMC1200 cards.
 21   *
 22   * To control link specific options lmcctl is required.
 23   * It can be obtained from ftp.lanmedia.com.
 24   *
 25   * Linux driver notes:
 26   * Linux uses the device struct lmc_private to pass private information
 27   * around.
 28   *
 29   * The initialization portion of this driver (the lmc_reset() and the
 30   * lmc_dec_reset() functions, as well as the led controls and the
 31   * lmc_initcsrs() functions.
 32   *
 33   * The watchdog function runs every second and checks to see if
 34   * we still have link, and that the timing source is what we expected
 35   * it to be.  If link is lost, the interface is marked down, and
 36   * we no longer can transmit.
 37   *
 38   */
 39 
 40 #include <linux/kernel.h>
 41 #include <linux/module.h>
 42 #include <linux/string.h>
 43 #include <linux/timer.h>
 44 #include <linux/ptrace.h>
 45 #include <linux/errno.h>
 46 #include <linux/ioport.h>
 47 #include <linux/slab.h>
 48 #include <linux/interrupt.h>
 49 #include <linux/pci.h>
 50 #include <linux/delay.h>
 51 #include <linux/hdlc.h>
 52 #include <linux/in.h>
 53 #include <linux/if_arp.h>
 54 #include <linux/netdevice.h>
 55 #include <linux/etherdevice.h>
 56 #include <linux/skbuff.h>
 57 #include <linux/inet.h>
 58 #include <linux/bitops.h>
 59 #include <asm/processor.h>             /* Processor type for cache alignment. */
 60 #include <asm/io.h>
 61 #include <asm/dma.h>
 62 #include <asm/uaccess.h>
 63 //#include <asm/spinlock.h>
 64 
 65 #define DRIVER_MAJOR_VERSION     1
 66 #define DRIVER_MINOR_VERSION    34
 67 #define DRIVER_SUB_VERSION       0
 68 
 69 #define DRIVER_VERSION  ((DRIVER_MAJOR_VERSION << 8) + DRIVER_MINOR_VERSION)
 70 
 71 #include "lmc.h"
 72 #include "lmc_var.h"
 73 #include "lmc_ioctl.h"
 74 #include "lmc_debug.h"
 75 #include "lmc_proto.h"
 76 
 77 static int LMC_PKT_BUF_SZ = 1542;
 78 
 79 static const struct pci_device_id lmc_pci_tbl[] = {
 80         { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_TULIP_FAST,
 81           PCI_VENDOR_ID_LMC, PCI_ANY_ID },
 82         { PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_TULIP_FAST,
 83           PCI_ANY_ID, PCI_VENDOR_ID_LMC },
 84         { 0 }
 85 };
 86 
 87 MODULE_DEVICE_TABLE(pci, lmc_pci_tbl);
 88 MODULE_LICENSE("GPL v2");
 89 
 90 
 91 static netdev_tx_t lmc_start_xmit(struct sk_buff *skb,
 92                                         struct net_device *dev);
 93 static int lmc_rx (struct net_device *dev);
 94 static int lmc_open(struct net_device *dev);
 95 static int lmc_close(struct net_device *dev);
 96 static struct net_device_stats *lmc_get_stats(struct net_device *dev);
 97 static irqreturn_t lmc_interrupt(int irq, void *dev_instance);
 98 static void lmc_initcsrs(lmc_softc_t * const sc, lmc_csrptr_t csr_base, size_t csr_size);
 99 static void lmc_softreset(lmc_softc_t * const);
100 static void lmc_running_reset(struct net_device *dev);
101 static int lmc_ifdown(struct net_device * const);
102 static void lmc_watchdog(unsigned long data);
103 static void lmc_reset(lmc_softc_t * const sc);
104 static void lmc_dec_reset(lmc_softc_t * const sc);
105 static void lmc_driver_timeout(struct net_device *dev);
106 
107 /*
108  * linux reserves 16 device specific IOCTLs.  We call them
109  * LMCIOC* to control various bits of our world.
110  */
111 int lmc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
112 {
113     lmc_softc_t *sc = dev_to_sc(dev);
114     lmc_ctl_t ctl;
115     int ret = -EOPNOTSUPP;
116     u16 regVal;
117     unsigned long flags;
118 
119     lmc_trace(dev, "lmc_ioctl in");
120 
121     /*
122      * Most functions mess with the structure
123      * Disable interrupts while we do the polling
124      */
125 
126     switch (cmd) {
127         /*
128          * Return current driver state.  Since we keep this up
129          * To date internally, just copy this out to the user.
130          */
131     case LMCIOCGINFO: /*fold01*/
132         if (copy_to_user(ifr->ifr_data, &sc->ictl, sizeof(lmc_ctl_t)))
133                 ret = -EFAULT;
134         else
135                 ret = 0;
136         break;
137 
138     case LMCIOCSINFO: /*fold01*/
139         if (!capable(CAP_NET_ADMIN)) {
140             ret = -EPERM;
141             break;
142         }
143 
144         if(dev->flags & IFF_UP){
145             ret = -EBUSY;
146             break;
147         }
148 
149         if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
150                 ret = -EFAULT;
151                 break;
152         }
153 
154         spin_lock_irqsave(&sc->lmc_lock, flags);
155         sc->lmc_media->set_status (sc, &ctl);
156 
157         if(ctl.crc_length != sc->ictl.crc_length) {
158             sc->lmc_media->set_crc_length(sc, ctl.crc_length);
159             if (sc->ictl.crc_length == LMC_CTL_CRC_LENGTH_16)
160                 sc->TxDescriptControlInit |=  LMC_TDES_ADD_CRC_DISABLE;
161             else
162                 sc->TxDescriptControlInit &= ~LMC_TDES_ADD_CRC_DISABLE;
163         }
164         spin_unlock_irqrestore(&sc->lmc_lock, flags);
165 
166         ret = 0;
167         break;
168 
169     case LMCIOCIFTYPE: /*fold01*/
170         {
171             u16 old_type = sc->if_type;
172             u16 new_type;
173 
174             if (!capable(CAP_NET_ADMIN)) {
175                 ret = -EPERM;
176                 break;
177             }
178 
179             if (copy_from_user(&new_type, ifr->ifr_data, sizeof(u16))) {
180                 ret = -EFAULT;
181                 break;
182             }
183 
184             
185             if (new_type == old_type)
186             {
187                 ret = 0 ;
188                 break;                          /* no change */
189             }
190             
191             spin_lock_irqsave(&sc->lmc_lock, flags);
192             lmc_proto_close(sc);
193 
194             sc->if_type = new_type;
195             lmc_proto_attach(sc);
196             ret = lmc_proto_open(sc);
197             spin_unlock_irqrestore(&sc->lmc_lock, flags);
198             break;
199         }
200 
201     case LMCIOCGETXINFO: /*fold01*/
202         spin_lock_irqsave(&sc->lmc_lock, flags);
203         sc->lmc_xinfo.Magic0 = 0xBEEFCAFE;
204 
205         sc->lmc_xinfo.PciCardType = sc->lmc_cardtype;
206         sc->lmc_xinfo.PciSlotNumber = 0;
207         sc->lmc_xinfo.DriverMajorVersion = DRIVER_MAJOR_VERSION;
208         sc->lmc_xinfo.DriverMinorVersion = DRIVER_MINOR_VERSION;
209         sc->lmc_xinfo.DriverSubVersion = DRIVER_SUB_VERSION;
210         sc->lmc_xinfo.XilinxRevisionNumber =
211             lmc_mii_readreg (sc, 0, 3) & 0xf;
212         sc->lmc_xinfo.MaxFrameSize = LMC_PKT_BUF_SZ;
213         sc->lmc_xinfo.link_status = sc->lmc_media->get_link_status (sc);
214         sc->lmc_xinfo.mii_reg16 = lmc_mii_readreg (sc, 0, 16);
215         spin_unlock_irqrestore(&sc->lmc_lock, flags);
216 
217         sc->lmc_xinfo.Magic1 = 0xDEADBEEF;
218 
219         if (copy_to_user(ifr->ifr_data, &sc->lmc_xinfo,
220                          sizeof(struct lmc_xinfo)))
221                 ret = -EFAULT;
222         else
223                 ret = 0;
224 
225         break;
226 
227     case LMCIOCGETLMCSTATS:
228             spin_lock_irqsave(&sc->lmc_lock, flags);
229             if (sc->lmc_cardtype == LMC_CARDTYPE_T1) {
230                     lmc_mii_writereg(sc, 0, 17, T1FRAMER_FERR_LSB);
231                     sc->extra_stats.framingBitErrorCount +=
232                             lmc_mii_readreg(sc, 0, 18) & 0xff;
233                     lmc_mii_writereg(sc, 0, 17, T1FRAMER_FERR_MSB);
234                     sc->extra_stats.framingBitErrorCount +=
235                             (lmc_mii_readreg(sc, 0, 18) & 0xff) << 8;
236                     lmc_mii_writereg(sc, 0, 17, T1FRAMER_LCV_LSB);
237                     sc->extra_stats.lineCodeViolationCount +=
238                             lmc_mii_readreg(sc, 0, 18) & 0xff;
239                     lmc_mii_writereg(sc, 0, 17, T1FRAMER_LCV_MSB);
240                     sc->extra_stats.lineCodeViolationCount +=
241                             (lmc_mii_readreg(sc, 0, 18) & 0xff) << 8;
242                     lmc_mii_writereg(sc, 0, 17, T1FRAMER_AERR);
243                     regVal = lmc_mii_readreg(sc, 0, 18) & 0xff;
244 
245                     sc->extra_stats.lossOfFrameCount +=
246                             (regVal & T1FRAMER_LOF_MASK) >> 4;
247                     sc->extra_stats.changeOfFrameAlignmentCount +=
248                             (regVal & T1FRAMER_COFA_MASK) >> 2;
249                     sc->extra_stats.severelyErroredFrameCount +=
250                             regVal & T1FRAMER_SEF_MASK;
251             }
252             spin_unlock_irqrestore(&sc->lmc_lock, flags);
253             if (copy_to_user(ifr->ifr_data, &sc->lmc_device->stats,
254                              sizeof(sc->lmc_device->stats)) ||
255                 copy_to_user(ifr->ifr_data + sizeof(sc->lmc_device->stats),
256                              &sc->extra_stats, sizeof(sc->extra_stats)))
257                     ret = -EFAULT;
258             else
259                     ret = 0;
260             break;
261 
262     case LMCIOCCLEARLMCSTATS:
263             if (!capable(CAP_NET_ADMIN)) {
264                     ret = -EPERM;
265                     break;
266             }
267 
268             spin_lock_irqsave(&sc->lmc_lock, flags);
269             memset(&sc->lmc_device->stats, 0, sizeof(sc->lmc_device->stats));
270             memset(&sc->extra_stats, 0, sizeof(sc->extra_stats));
271             sc->extra_stats.check = STATCHECK;
272             sc->extra_stats.version_size = (DRIVER_VERSION << 16) +
273                     sizeof(sc->lmc_device->stats) + sizeof(sc->extra_stats);
274             sc->extra_stats.lmc_cardtype = sc->lmc_cardtype;
275             spin_unlock_irqrestore(&sc->lmc_lock, flags);
276             ret = 0;
277             break;
278 
279     case LMCIOCSETCIRCUIT: /*fold01*/
280         if (!capable(CAP_NET_ADMIN)){
281             ret = -EPERM;
282             break;
283         }
284 
285         if(dev->flags & IFF_UP){
286             ret = -EBUSY;
287             break;
288         }
289 
290         if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
291                 ret = -EFAULT;
292                 break;
293         }
294         spin_lock_irqsave(&sc->lmc_lock, flags);
295         sc->lmc_media->set_circuit_type(sc, ctl.circuit_type);
296         sc->ictl.circuit_type = ctl.circuit_type;
297         spin_unlock_irqrestore(&sc->lmc_lock, flags);
298         ret = 0;
299 
300         break;
301 
302     case LMCIOCRESET: /*fold01*/
303         if (!capable(CAP_NET_ADMIN)){
304             ret = -EPERM;
305             break;
306         }
307 
308         spin_lock_irqsave(&sc->lmc_lock, flags);
309         /* Reset driver and bring back to current state */
310         printk (" REG16 before reset +%04x\n", lmc_mii_readreg (sc, 0, 16));
311         lmc_running_reset (dev);
312         printk (" REG16 after reset +%04x\n", lmc_mii_readreg (sc, 0, 16));
313 
314         LMC_EVENT_LOG(LMC_EVENT_FORCEDRESET, LMC_CSR_READ (sc, csr_status), lmc_mii_readreg (sc, 0, 16));
315         spin_unlock_irqrestore(&sc->lmc_lock, flags);
316 
317         ret = 0;
318         break;
319 
320 #ifdef DEBUG
321     case LMCIOCDUMPEVENTLOG:
322         if (copy_to_user(ifr->ifr_data, &lmcEventLogIndex, sizeof(u32))) {
323                 ret = -EFAULT;
324                 break;
325         }
326         if (copy_to_user(ifr->ifr_data + sizeof(u32), lmcEventLogBuf,
327                          sizeof(lmcEventLogBuf)))
328                 ret = -EFAULT;
329         else
330                 ret = 0;
331 
332         break;
333 #endif /* end ifdef _DBG_EVENTLOG */
334     case LMCIOCT1CONTROL: /*fold01*/
335         if (sc->lmc_cardtype != LMC_CARDTYPE_T1){
336             ret = -EOPNOTSUPP;
337             break;
338         }
339         break;
340     case LMCIOCXILINX: /*fold01*/
341         {
342             struct lmc_xilinx_control xc; /*fold02*/
343 
344             if (!capable(CAP_NET_ADMIN)){
345                 ret = -EPERM;
346                 break;
347             }
348 
349             /*
350              * Stop the xwitter whlie we restart the hardware
351              */
352             netif_stop_queue(dev);
353 
354             if (copy_from_user(&xc, ifr->ifr_data, sizeof(struct lmc_xilinx_control))) {
355                 ret = -EFAULT;
356                 break;
357             }
358             switch(xc.command){
359             case lmc_xilinx_reset: /*fold02*/
360                 {
361                     u16 mii;
362                     spin_lock_irqsave(&sc->lmc_lock, flags);
363                     mii = lmc_mii_readreg (sc, 0, 16);
364 
365                     /*
366                      * Make all of them 0 and make input
367                      */
368                     lmc_gpio_mkinput(sc, 0xff);
369 
370                     /*
371                      * make the reset output
372                      */
373                     lmc_gpio_mkoutput(sc, LMC_GEP_RESET);
374 
375                     /*
376                      * RESET low to force configuration.  This also forces
377                      * the transmitter clock to be internal, but we expect to reset
378                      * that later anyway.
379                      */
380 
381                     sc->lmc_gpio &= ~LMC_GEP_RESET;
382                     LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
383 
384 
385                     /*
386                      * hold for more than 10 microseconds
387                      */
388                     udelay(50);
389 
390                     sc->lmc_gpio |= LMC_GEP_RESET;
391                     LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
392 
393 
394                     /*
395                      * stop driving Xilinx-related signals
396                      */
397                     lmc_gpio_mkinput(sc, 0xff);
398 
399                     /* Reset the frammer hardware */
400                     sc->lmc_media->set_link_status (sc, 1);
401                     sc->lmc_media->set_status (sc, NULL);
402 //                    lmc_softreset(sc);
403 
404                     {
405                         int i;
406                         for(i = 0; i < 5; i++){
407                             lmc_led_on(sc, LMC_DS3_LED0);
408                             mdelay(100);
409                             lmc_led_off(sc, LMC_DS3_LED0);
410                             lmc_led_on(sc, LMC_DS3_LED1);
411                             mdelay(100);
412                             lmc_led_off(sc, LMC_DS3_LED1);
413                             lmc_led_on(sc, LMC_DS3_LED3);
414                             mdelay(100);
415                             lmc_led_off(sc, LMC_DS3_LED3);
416                             lmc_led_on(sc, LMC_DS3_LED2);
417                             mdelay(100);
418                             lmc_led_off(sc, LMC_DS3_LED2);
419                         }
420                     }
421                     spin_unlock_irqrestore(&sc->lmc_lock, flags);
422                     
423                     
424 
425                     ret = 0x0;
426 
427                 }
428 
429                 break;
430             case lmc_xilinx_load_prom: /*fold02*/
431                 {
432                     u16 mii;
433                     int timeout = 500000;
434                     spin_lock_irqsave(&sc->lmc_lock, flags);
435                     mii = lmc_mii_readreg (sc, 0, 16);
436 
437                     /*
438                      * Make all of them 0 and make input
439                      */
440                     lmc_gpio_mkinput(sc, 0xff);
441 
442                     /*
443                      * make the reset output
444                      */
445                     lmc_gpio_mkoutput(sc,  LMC_GEP_DP | LMC_GEP_RESET);
446 
447                     /*
448                      * RESET low to force configuration.  This also forces
449                      * the transmitter clock to be internal, but we expect to reset
450                      * that later anyway.
451                      */
452 
453                     sc->lmc_gpio &= ~(LMC_GEP_RESET | LMC_GEP_DP);
454                     LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
455 
456 
457                     /*
458                      * hold for more than 10 microseconds
459                      */
460                     udelay(50);
461 
462                     sc->lmc_gpio |= LMC_GEP_DP | LMC_GEP_RESET;
463                     LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
464 
465                     /*
466                      * busy wait for the chip to reset
467                      */
468                     while( (LMC_CSR_READ(sc, csr_gp) & LMC_GEP_INIT) == 0 &&
469                            (timeout-- > 0))
470                         cpu_relax();
471 
472 
473                     /*
474                      * stop driving Xilinx-related signals
475                      */
476                     lmc_gpio_mkinput(sc, 0xff);
477                     spin_unlock_irqrestore(&sc->lmc_lock, flags);
478 
479                     ret = 0x0;
480                     
481 
482                     break;
483 
484                 }
485 
486             case lmc_xilinx_load: /*fold02*/
487                 {
488                     char *data;
489                     int pos;
490                     int timeout = 500000;
491 
492                     if (!xc.data) {
493                             ret = -EINVAL;
494                             break;
495                     }
496 
497                     data = kmalloc(xc.len, GFP_KERNEL);
498                     if (!data) {
499                             ret = -ENOMEM;
500                             break;
501                     }
502                     
503                     if(copy_from_user(data, xc.data, xc.len))
504                     {
505                         kfree(data);
506                         ret = -ENOMEM;
507                         break;
508                     }
509 
510                     printk("%s: Starting load of data Len: %d at 0x%p == 0x%p\n", dev->name, xc.len, xc.data, data);
511 
512                     spin_lock_irqsave(&sc->lmc_lock, flags);
513                     lmc_gpio_mkinput(sc, 0xff);
514 
515                     /*
516                      * Clear the Xilinx and start prgramming from the DEC
517                      */
518 
519                     /*
520                      * Set ouput as:
521                      * Reset: 0 (active)
522                      * DP:    0 (active)
523                      * Mode:  1
524                      *
525                      */
526                     sc->lmc_gpio = 0x00;
527                     sc->lmc_gpio &= ~LMC_GEP_DP;
528                     sc->lmc_gpio &= ~LMC_GEP_RESET;
529                     sc->lmc_gpio |=  LMC_GEP_MODE;
530                     LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
531 
532                     lmc_gpio_mkoutput(sc, LMC_GEP_MODE | LMC_GEP_DP | LMC_GEP_RESET);
533 
534                     /*
535                      * Wait at least 10 us 20 to be safe
536                      */
537                     udelay(50);
538 
539                     /*
540                      * Clear reset and activate programming lines
541                      * Reset: Input
542                      * DP:    Input
543                      * Clock: Output
544                      * Data:  Output
545                      * Mode:  Output
546                      */
547                     lmc_gpio_mkinput(sc, LMC_GEP_DP | LMC_GEP_RESET);
548 
549                     /*
550                      * Set LOAD, DATA, Clock to 1
551                      */
552                     sc->lmc_gpio = 0x00;
553                     sc->lmc_gpio |= LMC_GEP_MODE;
554                     sc->lmc_gpio |= LMC_GEP_DATA;
555                     sc->lmc_gpio |= LMC_GEP_CLK;
556                     LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
557                     
558                     lmc_gpio_mkoutput(sc, LMC_GEP_DATA | LMC_GEP_CLK | LMC_GEP_MODE );
559 
560                     /*
561                      * busy wait for the chip to reset
562                      */
563                     while( (LMC_CSR_READ(sc, csr_gp) & LMC_GEP_INIT) == 0 &&
564                            (timeout-- > 0))
565                         cpu_relax();
566 
567                     printk(KERN_DEBUG "%s: Waited %d for the Xilinx to clear it's memory\n", dev->name, 500000-timeout);
568 
569                     for(pos = 0; pos < xc.len; pos++){
570                         switch(data[pos]){
571                         case 0:
572                             sc->lmc_gpio &= ~LMC_GEP_DATA; /* Data is 0 */
573                             break;
574                         case 1:
575                             sc->lmc_gpio |= LMC_GEP_DATA; /* Data is 1 */
576                             break;
577                         default:
578                             printk(KERN_WARNING "%s Bad data in xilinx programming data at %d, got %d wanted 0 or 1\n", dev->name, pos, data[pos]);
579                             sc->lmc_gpio |= LMC_GEP_DATA; /* Assume it's 1 */
580                         }
581                         sc->lmc_gpio &= ~LMC_GEP_CLK; /* Clock to zero */
582                         sc->lmc_gpio |= LMC_GEP_MODE;
583                         LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
584                         udelay(1);
585                         
586                         sc->lmc_gpio |= LMC_GEP_CLK; /* Put the clack back to one */
587                         sc->lmc_gpio |= LMC_GEP_MODE;
588                         LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
589                         udelay(1);
590                     }
591                     if((LMC_CSR_READ(sc, csr_gp) & LMC_GEP_INIT) == 0){
592                         printk(KERN_WARNING "%s: Reprogramming FAILED. Needs to be reprogrammed. (corrupted data)\n", dev->name);
593                     }
594                     else if((LMC_CSR_READ(sc, csr_gp) & LMC_GEP_DP) == 0){
595                         printk(KERN_WARNING "%s: Reprogramming FAILED. Needs to be reprogrammed. (done)\n", dev->name);
596                     }
597                     else {
598                         printk(KERN_DEBUG "%s: Done reprogramming Xilinx, %d bits, good luck!\n", dev->name, pos);
599                     }
600 
601                     lmc_gpio_mkinput(sc, 0xff);
602                     
603                     sc->lmc_miireg16 |= LMC_MII16_FIFO_RESET;
604                     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
605 
606                     sc->lmc_miireg16 &= ~LMC_MII16_FIFO_RESET;
607                     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
608                     spin_unlock_irqrestore(&sc->lmc_lock, flags);
609 
610                     kfree(data);
611                     
612                     ret = 0;
613                     
614                     break;
615                 }
616             default: /*fold02*/
617                 ret = -EBADE;
618                 break;
619             }
620 
621             netif_wake_queue(dev);
622             sc->lmc_txfull = 0;
623 
624         }
625         break;
626     default: /*fold01*/
627         /* If we don't know what to do, give the protocol a shot. */
628         ret = lmc_proto_ioctl (sc, ifr, cmd);
629         break;
630     }
631 
632     lmc_trace(dev, "lmc_ioctl out");
633 
634     return ret;
635 }
636 
637 
638 /* the watchdog process that cruises around */
639 static void lmc_watchdog (unsigned long data) /*fold00*/
640 {
641     struct net_device *dev = (struct net_device *)data;
642     lmc_softc_t *sc = dev_to_sc(dev);
643     int link_status;
644     u32 ticks;
645     unsigned long flags;
646 
647     lmc_trace(dev, "lmc_watchdog in");
648 
649     spin_lock_irqsave(&sc->lmc_lock, flags);
650 
651     if(sc->check != 0xBEAFCAFE){
652         printk("LMC: Corrupt net_device struct, breaking out\n");
653         spin_unlock_irqrestore(&sc->lmc_lock, flags);
654         return;
655     }
656 
657 
658     /* Make sure the tx jabber and rx watchdog are off,
659      * and the transmit and receive processes are running.
660      */
661 
662     LMC_CSR_WRITE (sc, csr_15, 0x00000011);
663     sc->lmc_cmdmode |= TULIP_CMD_TXRUN | TULIP_CMD_RXRUN;
664     LMC_CSR_WRITE (sc, csr_command, sc->lmc_cmdmode);
665 
666     if (sc->lmc_ok == 0)
667         goto kick_timer;
668 
669     LMC_EVENT_LOG(LMC_EVENT_WATCHDOG, LMC_CSR_READ (sc, csr_status), lmc_mii_readreg (sc, 0, 16));
670 
671     /* --- begin time out check -----------------------------------
672      * check for a transmit interrupt timeout
673      * Has the packet xmt vs xmt serviced threshold been exceeded */
674     if (sc->lmc_taint_tx == sc->lastlmc_taint_tx &&
675         sc->lmc_device->stats.tx_packets > sc->lasttx_packets &&
676         sc->tx_TimeoutInd == 0)
677     {
678 
679         /* wait for the watchdog to come around again */
680         sc->tx_TimeoutInd = 1;
681     }
682     else if (sc->lmc_taint_tx == sc->lastlmc_taint_tx &&
683              sc->lmc_device->stats.tx_packets > sc->lasttx_packets &&
684              sc->tx_TimeoutInd)
685     {
686 
687         LMC_EVENT_LOG(LMC_EVENT_XMTINTTMO, LMC_CSR_READ (sc, csr_status), 0);
688 
689         sc->tx_TimeoutDisplay = 1;
690         sc->extra_stats.tx_TimeoutCnt++;
691 
692         /* DEC chip is stuck, hit it with a RESET!!!! */
693         lmc_running_reset (dev);
694 
695 
696         /* look at receive & transmit process state to make sure they are running */
697         LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ (sc, csr_status), 0);
698 
699         /* look at: DSR - 02  for Reg 16
700          *                  CTS - 08
701          *                  DCD - 10
702          *                  RI  - 20
703          * for Reg 17
704          */
705         LMC_EVENT_LOG(LMC_EVENT_RESET2, lmc_mii_readreg (sc, 0, 16), lmc_mii_readreg (sc, 0, 17));
706 
707         /* reset the transmit timeout detection flag */
708         sc->tx_TimeoutInd = 0;
709         sc->lastlmc_taint_tx = sc->lmc_taint_tx;
710         sc->lasttx_packets = sc->lmc_device->stats.tx_packets;
711     } else {
712         sc->tx_TimeoutInd = 0;
713         sc->lastlmc_taint_tx = sc->lmc_taint_tx;
714         sc->lasttx_packets = sc->lmc_device->stats.tx_packets;
715     }
716 
717     /* --- end time out check ----------------------------------- */
718 
719 
720     link_status = sc->lmc_media->get_link_status (sc);
721 
722     /*
723      * hardware level link lost, but the interface is marked as up.
724      * Mark it as down.
725      */
726     if ((link_status == 0) && (sc->last_link_status != 0)) {
727         printk(KERN_WARNING "%s: hardware/physical link down\n", dev->name);
728         sc->last_link_status = 0;
729         /* lmc_reset (sc); Why reset??? The link can go down ok */
730 
731         /* Inform the world that link has been lost */
732         netif_carrier_off(dev);
733     }
734 
735     /*
736      * hardware link is up, but the interface is marked as down.
737      * Bring it back up again.
738      */
739      if (link_status != 0 && sc->last_link_status == 0) {
740          printk(KERN_WARNING "%s: hardware/physical link up\n", dev->name);
741          sc->last_link_status = 1;
742          /* lmc_reset (sc); Again why reset??? */
743 
744          netif_carrier_on(dev);
745      }
746 
747     /* Call media specific watchdog functions */
748     sc->lmc_media->watchdog(sc);
749 
750     /*
751      * Poke the transmitter to make sure it
752      * never stops, even if we run out of mem
753      */
754     LMC_CSR_WRITE(sc, csr_rxpoll, 0);
755 
756     /*
757      * Check for code that failed
758      * and try and fix it as appropriate
759      */
760     if(sc->failed_ring == 1){
761         /*
762          * Failed to setup the recv/xmit rin
763          * Try again
764          */
765         sc->failed_ring = 0;
766         lmc_softreset(sc);
767     }
768     if(sc->failed_recv_alloc == 1){
769         /*
770          * We failed to alloc mem in the
771          * interrupt handler, go through the rings
772          * and rebuild them
773          */
774         sc->failed_recv_alloc = 0;
775         lmc_softreset(sc);
776     }
777 
778 
779     /*
780      * remember the timer value
781      */
782 kick_timer:
783 
784     ticks = LMC_CSR_READ (sc, csr_gp_timer);
785     LMC_CSR_WRITE (sc, csr_gp_timer, 0xffffffffUL);
786     sc->ictl.ticks = 0x0000ffff - (ticks & 0x0000ffff);
787 
788     /*
789      * restart this timer.
790      */
791     sc->timer.expires = jiffies + (HZ);
792     add_timer (&sc->timer);
793 
794     spin_unlock_irqrestore(&sc->lmc_lock, flags);
795 
796     lmc_trace(dev, "lmc_watchdog out");
797 
798 }
799 
800 static int lmc_attach(struct net_device *dev, unsigned short encoding,
801                       unsigned short parity)
802 {
803         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
804                 return 0;
805         return -EINVAL;
806 }
807 
808 static const struct net_device_ops lmc_ops = {
809         .ndo_open       = lmc_open,
810         .ndo_stop       = lmc_close,
811         .ndo_change_mtu = hdlc_change_mtu,
812         .ndo_start_xmit = hdlc_start_xmit,
813         .ndo_do_ioctl   = lmc_ioctl,
814         .ndo_tx_timeout = lmc_driver_timeout,
815         .ndo_get_stats  = lmc_get_stats,
816 };
817 
818 static int lmc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
819 {
820         lmc_softc_t *sc;
821         struct net_device *dev;
822         u16 subdevice;
823         u16 AdapModelNum;
824         int err;
825         static int cards_found;
826 
827         /* lmc_trace(dev, "lmc_init_one in"); */
828 
829         err = pci_enable_device(pdev);
830         if (err) {
831                 printk(KERN_ERR "lmc: pci enable failed: %d\n", err);
832                 return err;
833         }
834 
835         err = pci_request_regions(pdev, "lmc");
836         if (err) {
837                 printk(KERN_ERR "lmc: pci_request_region failed\n");
838                 goto err_req_io;
839         }
840 
841         /*
842          * Allocate our own device structure
843          */
844         sc = kzalloc(sizeof(lmc_softc_t), GFP_KERNEL);
845         if (!sc) {
846                 err = -ENOMEM;
847                 goto err_kzalloc;
848         }
849 
850         dev = alloc_hdlcdev(sc);
851         if (!dev) {
852                 printk(KERN_ERR "lmc:alloc_netdev for device failed\n");
853                 goto err_hdlcdev;
854         }
855 
856 
857         dev->type = ARPHRD_HDLC;
858         dev_to_hdlc(dev)->xmit = lmc_start_xmit;
859         dev_to_hdlc(dev)->attach = lmc_attach;
860         dev->netdev_ops = &lmc_ops;
861         dev->watchdog_timeo = HZ; /* 1 second */
862         dev->tx_queue_len = 100;
863         sc->lmc_device = dev;
864         sc->name = dev->name;
865         sc->if_type = LMC_PPP;
866         sc->check = 0xBEAFCAFE;
867         dev->base_addr = pci_resource_start(pdev, 0);
868         dev->irq = pdev->irq;
869         pci_set_drvdata(pdev, dev);
870         SET_NETDEV_DEV(dev, &pdev->dev);
871 
872         /*
873          * This will get the protocol layer ready and do any 1 time init's
874          * Must have a valid sc and dev structure
875          */
876         lmc_proto_attach(sc);
877 
878         /* Init the spin lock so can call it latter */
879 
880         spin_lock_init(&sc->lmc_lock);
881         pci_set_master(pdev);
882 
883         printk(KERN_INFO "%s: detected at %lx, irq %d\n", dev->name,
884                dev->base_addr, dev->irq);
885 
886         err = register_hdlc_device(dev);
887         if (err) {
888                 printk(KERN_ERR "%s: register_netdev failed.\n", dev->name);
889                 free_netdev(dev);
890                 goto err_hdlcdev;
891         }
892 
893     sc->lmc_cardtype = LMC_CARDTYPE_UNKNOWN;
894     sc->lmc_timing = LMC_CTL_CLOCK_SOURCE_EXT;
895 
896     /*
897      *
898      * Check either the subvendor or the subdevice, some systems reverse
899      * the setting in the bois, seems to be version and arch dependent?
900      * Fix the error, exchange the two values 
901      */
902     if ((subdevice = pdev->subsystem_device) == PCI_VENDOR_ID_LMC)
903             subdevice = pdev->subsystem_vendor;
904 
905     switch (subdevice) {
906     case PCI_DEVICE_ID_LMC_HSSI:
907         printk(KERN_INFO "%s: LMC HSSI\n", dev->name);
908         sc->lmc_cardtype = LMC_CARDTYPE_HSSI;
909         sc->lmc_media = &lmc_hssi_media;
910         break;
911     case PCI_DEVICE_ID_LMC_DS3:
912         printk(KERN_INFO "%s: LMC DS3\n", dev->name);
913         sc->lmc_cardtype = LMC_CARDTYPE_DS3;
914         sc->lmc_media = &lmc_ds3_media;
915         break;
916     case PCI_DEVICE_ID_LMC_SSI:
917         printk(KERN_INFO "%s: LMC SSI\n", dev->name);
918         sc->lmc_cardtype = LMC_CARDTYPE_SSI;
919         sc->lmc_media = &lmc_ssi_media;
920         break;
921     case PCI_DEVICE_ID_LMC_T1:
922         printk(KERN_INFO "%s: LMC T1\n", dev->name);
923         sc->lmc_cardtype = LMC_CARDTYPE_T1;
924         sc->lmc_media = &lmc_t1_media;
925         break;
926     default:
927         printk(KERN_WARNING "%s: LMC UNKNOWN CARD!\n", dev->name);
928         break;
929     }
930 
931     lmc_initcsrs (sc, dev->base_addr, 8);
932 
933     lmc_gpio_mkinput (sc, 0xff);
934     sc->lmc_gpio = 0;           /* drive no signals yet */
935 
936     sc->lmc_media->defaults (sc);
937 
938     sc->lmc_media->set_link_status (sc, LMC_LINK_UP);
939 
940     /* verify that the PCI Sub System ID matches the Adapter Model number
941      * from the MII register
942      */
943     AdapModelNum = (lmc_mii_readreg (sc, 0, 3) & 0x3f0) >> 4;
944 
945     if ((AdapModelNum != LMC_ADAP_T1 || /* detect LMC1200 */
946          subdevice != PCI_DEVICE_ID_LMC_T1) &&
947         (AdapModelNum != LMC_ADAP_SSI || /* detect LMC1000 */
948          subdevice != PCI_DEVICE_ID_LMC_SSI) &&
949         (AdapModelNum != LMC_ADAP_DS3 || /* detect LMC5245 */
950          subdevice != PCI_DEVICE_ID_LMC_DS3) &&
951         (AdapModelNum != LMC_ADAP_HSSI || /* detect LMC5200 */
952          subdevice != PCI_DEVICE_ID_LMC_HSSI))
953             printk(KERN_WARNING "%s: Model number (%d) miscompare for PCI"
954                    " Subsystem ID = 0x%04x\n",
955                    dev->name, AdapModelNum, subdevice);
956 
957     /*
958      * reset clock
959      */
960     LMC_CSR_WRITE (sc, csr_gp_timer, 0xFFFFFFFFUL);
961 
962     sc->board_idx = cards_found++;
963     sc->extra_stats.check = STATCHECK;
964     sc->extra_stats.version_size = (DRIVER_VERSION << 16) +
965             sizeof(sc->lmc_device->stats) + sizeof(sc->extra_stats);
966     sc->extra_stats.lmc_cardtype = sc->lmc_cardtype;
967 
968     sc->lmc_ok = 0;
969     sc->last_link_status = 0;
970 
971     lmc_trace(dev, "lmc_init_one out");
972     return 0;
973 
974 err_hdlcdev:
975         kfree(sc);
976 err_kzalloc:
977         pci_release_regions(pdev);
978 err_req_io:
979         pci_disable_device(pdev);
980         return err;
981 }
982 
983 /*
984  * Called from pci when removing module.
985  */
986 static void lmc_remove_one(struct pci_dev *pdev)
987 {
988         struct net_device *dev = pci_get_drvdata(pdev);
989 
990         if (dev) {
991                 printk(KERN_DEBUG "%s: removing...\n", dev->name);
992                 unregister_hdlc_device(dev);
993                 free_netdev(dev);
994                 pci_release_regions(pdev);
995                 pci_disable_device(pdev);
996         }
997 }
998 
999 /* After this is called, packets can be sent.
1000  * Does not initialize the addresses
1001  */
1002 static int lmc_open(struct net_device *dev)
1003 {
1004     lmc_softc_t *sc = dev_to_sc(dev);
1005     int err;
1006 
1007     lmc_trace(dev, "lmc_open in");
1008 
1009     lmc_led_on(sc, LMC_DS3_LED0);
1010 
1011     lmc_dec_reset(sc);
1012     lmc_reset(sc);
1013 
1014     LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ(sc, csr_status), 0);
1015     LMC_EVENT_LOG(LMC_EVENT_RESET2, lmc_mii_readreg(sc, 0, 16),
1016                   lmc_mii_readreg(sc, 0, 17));
1017 
1018     if (sc->lmc_ok){
1019         lmc_trace(dev, "lmc_open lmc_ok out");
1020         return 0;
1021     }
1022 
1023     lmc_softreset (sc);
1024 
1025     /* Since we have to use PCI bus, this should work on x86,alpha,ppc */
1026     if (request_irq (dev->irq, lmc_interrupt, IRQF_SHARED, dev->name, dev)){
1027         printk(KERN_WARNING "%s: could not get irq: %d\n", dev->name, dev->irq);
1028         lmc_trace(dev, "lmc_open irq failed out");
1029         return -EAGAIN;
1030     }
1031     sc->got_irq = 1;
1032 
1033     /* Assert Terminal Active */
1034     sc->lmc_miireg16 |= LMC_MII16_LED_ALL;
1035     sc->lmc_media->set_link_status (sc, LMC_LINK_UP);
1036 
1037     /*
1038      * reset to last state.
1039      */
1040     sc->lmc_media->set_status (sc, NULL);
1041 
1042     /* setup default bits to be used in tulip_desc_t transmit descriptor
1043      * -baz */
1044     sc->TxDescriptControlInit = (
1045                                  LMC_TDES_INTERRUPT_ON_COMPLETION
1046                                  | LMC_TDES_FIRST_SEGMENT
1047                                  | LMC_TDES_LAST_SEGMENT
1048                                  | LMC_TDES_SECOND_ADDR_CHAINED
1049                                  | LMC_TDES_DISABLE_PADDING
1050                                 );
1051 
1052     if (sc->ictl.crc_length == LMC_CTL_CRC_LENGTH_16) {
1053         /* disable 32 bit CRC generated by ASIC */
1054         sc->TxDescriptControlInit |= LMC_TDES_ADD_CRC_DISABLE;
1055     }
1056     sc->lmc_media->set_crc_length(sc, sc->ictl.crc_length);
1057     /* Acknoledge the Terminal Active and light LEDs */
1058 
1059     /* dev->flags |= IFF_UP; */
1060 
1061     if ((err = lmc_proto_open(sc)) != 0)
1062             return err;
1063 
1064     netif_start_queue(dev);
1065     sc->extra_stats.tx_tbusy0++;
1066 
1067     /*
1068      * select what interrupts we want to get
1069      */
1070     sc->lmc_intrmask = 0;
1071     /* Should be using the default interrupt mask defined in the .h file. */
1072     sc->lmc_intrmask |= (TULIP_STS_NORMALINTR
1073                          | TULIP_STS_RXINTR
1074                          | TULIP_STS_TXINTR
1075                          | TULIP_STS_ABNRMLINTR
1076                          | TULIP_STS_SYSERROR
1077                          | TULIP_STS_TXSTOPPED
1078                          | TULIP_STS_TXUNDERFLOW
1079                          | TULIP_STS_RXSTOPPED
1080                          | TULIP_STS_RXNOBUF
1081                         );
1082     LMC_CSR_WRITE (sc, csr_intr, sc->lmc_intrmask);
1083 
1084     sc->lmc_cmdmode |= TULIP_CMD_TXRUN;
1085     sc->lmc_cmdmode |= TULIP_CMD_RXRUN;
1086     LMC_CSR_WRITE (sc, csr_command, sc->lmc_cmdmode);
1087 
1088     sc->lmc_ok = 1; /* Run watchdog */
1089 
1090     /*
1091      * Set the if up now - pfb
1092      */
1093 
1094     sc->last_link_status = 1;
1095 
1096     /*
1097      * Setup a timer for the watchdog on probe, and start it running.
1098      * Since lmc_ok == 0, it will be a NOP for now.
1099      */
1100     init_timer (&sc->timer);
1101     sc->timer.expires = jiffies + HZ;
1102     sc->timer.data = (unsigned long) dev;
1103     sc->timer.function = lmc_watchdog;
1104     add_timer (&sc->timer);
1105 
1106     lmc_trace(dev, "lmc_open out");
1107 
1108     return 0;
1109 }
1110 
1111 /* Total reset to compensate for the AdTran DSU doing bad things
1112  *  under heavy load
1113  */
1114 
1115 static void lmc_running_reset (struct net_device *dev) /*fold00*/
1116 {
1117     lmc_softc_t *sc = dev_to_sc(dev);
1118 
1119     lmc_trace(dev, "lmc_running_reset in");
1120 
1121     /* stop interrupts */
1122     /* Clear the interrupt mask */
1123     LMC_CSR_WRITE (sc, csr_intr, 0x00000000);
1124 
1125     lmc_dec_reset (sc);
1126     lmc_reset (sc);
1127     lmc_softreset (sc);
1128     /* sc->lmc_miireg16 |= LMC_MII16_LED_ALL; */
1129     sc->lmc_media->set_link_status (sc, 1);
1130     sc->lmc_media->set_status (sc, NULL);
1131 
1132     netif_wake_queue(dev);
1133 
1134     sc->lmc_txfull = 0;
1135     sc->extra_stats.tx_tbusy0++;
1136 
1137     sc->lmc_intrmask = TULIP_DEFAULT_INTR_MASK;
1138     LMC_CSR_WRITE (sc, csr_intr, sc->lmc_intrmask);
1139 
1140     sc->lmc_cmdmode |= (TULIP_CMD_TXRUN | TULIP_CMD_RXRUN);
1141     LMC_CSR_WRITE (sc, csr_command, sc->lmc_cmdmode);
1142 
1143     lmc_trace(dev, "lmc_runnin_reset_out");
1144 }
1145 
1146 
1147 /* This is what is called when you ifconfig down a device.
1148  * This disables the timer for the watchdog and keepalives,
1149  * and disables the irq for dev.
1150  */
1151 static int lmc_close(struct net_device *dev)
1152 {
1153     /* not calling release_region() as we should */
1154     lmc_softc_t *sc = dev_to_sc(dev);
1155 
1156     lmc_trace(dev, "lmc_close in");
1157 
1158     sc->lmc_ok = 0;
1159     sc->lmc_media->set_link_status (sc, 0);
1160     del_timer (&sc->timer);
1161     lmc_proto_close(sc);
1162     lmc_ifdown (dev);
1163 
1164     lmc_trace(dev, "lmc_close out");
1165 
1166     return 0;
1167 }
1168 
1169 /* Ends the transfer of packets */
1170 /* When the interface goes down, this is called */
1171 static int lmc_ifdown (struct net_device *dev) /*fold00*/
1172 {
1173     lmc_softc_t *sc = dev_to_sc(dev);
1174     u32 csr6;
1175     int i;
1176 
1177     lmc_trace(dev, "lmc_ifdown in");
1178 
1179     /* Don't let anything else go on right now */
1180     //    dev->start = 0;
1181     netif_stop_queue(dev);
1182     sc->extra_stats.tx_tbusy1++;
1183 
1184     /* stop interrupts */
1185     /* Clear the interrupt mask */
1186     LMC_CSR_WRITE (sc, csr_intr, 0x00000000);
1187 
1188     /* Stop Tx and Rx on the chip */
1189     csr6 = LMC_CSR_READ (sc, csr_command);
1190     csr6 &= ~LMC_DEC_ST;                /* Turn off the Transmission bit */
1191     csr6 &= ~LMC_DEC_SR;                /* Turn off the Receive bit */
1192     LMC_CSR_WRITE (sc, csr_command, csr6);
1193 
1194     sc->lmc_device->stats.rx_missed_errors +=
1195             LMC_CSR_READ(sc, csr_missed_frames) & 0xffff;
1196 
1197     /* release the interrupt */
1198     if(sc->got_irq == 1){
1199         free_irq (dev->irq, dev);
1200         sc->got_irq = 0;
1201     }
1202 
1203     /* free skbuffs in the Rx queue */
1204     for (i = 0; i < LMC_RXDESCS; i++)
1205     {
1206         struct sk_buff *skb = sc->lmc_rxq[i];
1207         sc->lmc_rxq[i] = NULL;
1208         sc->lmc_rxring[i].status = 0;
1209         sc->lmc_rxring[i].length = 0;
1210         sc->lmc_rxring[i].buffer1 = 0xDEADBEEF;
1211         if (skb != NULL)
1212             dev_kfree_skb(skb);
1213         sc->lmc_rxq[i] = NULL;
1214     }
1215 
1216     for (i = 0; i < LMC_TXDESCS; i++)
1217     {
1218         if (sc->lmc_txq[i] != NULL)
1219             dev_kfree_skb(sc->lmc_txq[i]);
1220         sc->lmc_txq[i] = NULL;
1221     }
1222 
1223     lmc_led_off (sc, LMC_MII16_LED_ALL);
1224 
1225     netif_wake_queue(dev);
1226     sc->extra_stats.tx_tbusy0++;
1227 
1228     lmc_trace(dev, "lmc_ifdown out");
1229 
1230     return 0;
1231 }
1232 
1233 /* Interrupt handling routine.  This will take an incoming packet, or clean
1234  * up after a trasmit.
1235  */
1236 static irqreturn_t lmc_interrupt (int irq, void *dev_instance) /*fold00*/
1237 {
1238     struct net_device *dev = (struct net_device *) dev_instance;
1239     lmc_softc_t *sc = dev_to_sc(dev);
1240     u32 csr;
1241     int i;
1242     s32 stat;
1243     unsigned int badtx;
1244     u32 firstcsr;
1245     int max_work = LMC_RXDESCS;
1246     int handled = 0;
1247 
1248     lmc_trace(dev, "lmc_interrupt in");
1249 
1250     spin_lock(&sc->lmc_lock);
1251 
1252     /*
1253      * Read the csr to find what interrupts we have (if any)
1254      */
1255     csr = LMC_CSR_READ (sc, csr_status);
1256 
1257     /*
1258      * Make sure this is our interrupt
1259      */
1260     if ( ! (csr & sc->lmc_intrmask)) {
1261         goto lmc_int_fail_out;
1262     }
1263 
1264     firstcsr = csr;
1265 
1266     /* always go through this loop at least once */
1267     while (csr & sc->lmc_intrmask) {
1268         handled = 1;
1269 
1270         /*
1271          * Clear interrupt bits, we handle all case below
1272          */
1273         LMC_CSR_WRITE (sc, csr_status, csr);
1274 
1275         /*
1276          * One of
1277          *  - Transmit process timed out CSR5<1>
1278          *  - Transmit jabber timeout    CSR5<3>
1279          *  - Transmit underflow         CSR5<5>
1280          *  - Transmit Receiver buffer unavailable CSR5<7>
1281          *  - Receive process stopped    CSR5<8>
1282          *  - Receive watchdog timeout   CSR5<9>
1283          *  - Early transmit interrupt   CSR5<10>
1284          *
1285          * Is this really right? Should we do a running reset for jabber?
1286          * (being a WAN card and all)
1287          */
1288         if (csr & TULIP_STS_ABNRMLINTR){
1289             lmc_running_reset (dev);
1290             break;
1291         }
1292         
1293         if (csr & TULIP_STS_RXINTR){
1294             lmc_trace(dev, "rx interrupt");
1295             lmc_rx (dev);
1296             
1297         }
1298         if (csr & (TULIP_STS_TXINTR | TULIP_STS_TXNOBUF | TULIP_STS_TXSTOPPED)) {
1299 
1300             int         n_compl = 0 ;
1301             /* reset the transmit timeout detection flag -baz */
1302             sc->extra_stats.tx_NoCompleteCnt = 0;
1303 
1304             badtx = sc->lmc_taint_tx;
1305             i = badtx % LMC_TXDESCS;
1306 
1307             while ((badtx < sc->lmc_next_tx)) {
1308                 stat = sc->lmc_txring[i].status;
1309 
1310                 LMC_EVENT_LOG (LMC_EVENT_XMTINT, stat,
1311                                                  sc->lmc_txring[i].length);
1312                 /*
1313                  * If bit 31 is 1 the tulip owns it break out of the loop
1314                  */
1315                 if (stat & 0x80000000)
1316                     break;
1317 
1318                 n_compl++ ;             /* i.e., have an empty slot in ring */
1319                 /*
1320                  * If we have no skbuff or have cleared it
1321                  * Already continue to the next buffer
1322                  */
1323                 if (sc->lmc_txq[i] == NULL)
1324                     continue;
1325 
1326                 /*
1327                  * Check the total error summary to look for any errors
1328                  */
1329                 if (stat & 0x8000) {
1330                         sc->lmc_device->stats.tx_errors++;
1331                         if (stat & 0x4104)
1332                                 sc->lmc_device->stats.tx_aborted_errors++;
1333                         if (stat & 0x0C00)
1334                                 sc->lmc_device->stats.tx_carrier_errors++;
1335                         if (stat & 0x0200)
1336                                 sc->lmc_device->stats.tx_window_errors++;
1337                         if (stat & 0x0002)
1338                                 sc->lmc_device->stats.tx_fifo_errors++;
1339                 } else {
1340                         sc->lmc_device->stats.tx_bytes += sc->lmc_txring[i].length & 0x7ff;
1341 
1342                         sc->lmc_device->stats.tx_packets++;
1343                 }
1344 
1345                 //                dev_kfree_skb(sc->lmc_txq[i]);
1346                 dev_kfree_skb_irq(sc->lmc_txq[i]);
1347                 sc->lmc_txq[i] = NULL;
1348 
1349                 badtx++;
1350                 i = badtx % LMC_TXDESCS;
1351             }
1352 
1353             if (sc->lmc_next_tx - badtx > LMC_TXDESCS)
1354             {
1355                 printk ("%s: out of sync pointer\n", dev->name);
1356                 badtx += LMC_TXDESCS;
1357             }
1358             LMC_EVENT_LOG(LMC_EVENT_TBUSY0, n_compl, 0);
1359             sc->lmc_txfull = 0;
1360             netif_wake_queue(dev);
1361             sc->extra_stats.tx_tbusy0++;
1362 
1363 
1364 #ifdef DEBUG
1365             sc->extra_stats.dirtyTx = badtx;
1366             sc->extra_stats.lmc_next_tx = sc->lmc_next_tx;
1367             sc->extra_stats.lmc_txfull = sc->lmc_txfull;
1368 #endif
1369             sc->lmc_taint_tx = badtx;
1370 
1371             /*
1372              * Why was there a break here???
1373              */
1374         }                       /* end handle transmit interrupt */
1375 
1376         if (csr & TULIP_STS_SYSERROR) {
1377             u32 error;
1378             printk (KERN_WARNING "%s: system bus error csr: %#8.8x\n", dev->name, csr);
1379             error = csr>>23 & 0x7;
1380             switch(error){
1381             case 0x000:
1382                 printk(KERN_WARNING "%s: Parity Fault (bad)\n", dev->name);
1383                 break;
1384             case 0x001:
1385                 printk(KERN_WARNING "%s: Master Abort (naughty)\n", dev->name);
1386                 break;
1387             case 0x010:
1388                 printk(KERN_WARNING "%s: Target Abort (not so naughty)\n", dev->name);
1389                 break;
1390             default:
1391                 printk(KERN_WARNING "%s: This bus error code was supposed to be reserved!\n", dev->name);
1392             }
1393             lmc_dec_reset (sc);
1394             lmc_reset (sc);
1395             LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ (sc, csr_status), 0);
1396             LMC_EVENT_LOG(LMC_EVENT_RESET2,
1397                           lmc_mii_readreg (sc, 0, 16),
1398                           lmc_mii_readreg (sc, 0, 17));
1399 
1400         }
1401 
1402         
1403         if(max_work-- <= 0)
1404             break;
1405         
1406         /*
1407          * Get current csr status to make sure
1408          * we've cleared all interrupts
1409          */
1410         csr = LMC_CSR_READ (sc, csr_status);
1411     }                           /* end interrupt loop */
1412     LMC_EVENT_LOG(LMC_EVENT_INT, firstcsr, csr);
1413 
1414 lmc_int_fail_out:
1415 
1416     spin_unlock(&sc->lmc_lock);
1417 
1418     lmc_trace(dev, "lmc_interrupt out");
1419     return IRQ_RETVAL(handled);
1420 }
1421 
1422 static netdev_tx_t lmc_start_xmit(struct sk_buff *skb,
1423                                         struct net_device *dev)
1424 {
1425     lmc_softc_t *sc = dev_to_sc(dev);
1426     u32 flag;
1427     int entry;
1428     unsigned long flags;
1429 
1430     lmc_trace(dev, "lmc_start_xmit in");
1431 
1432     spin_lock_irqsave(&sc->lmc_lock, flags);
1433 
1434     /* normal path, tbusy known to be zero */
1435 
1436     entry = sc->lmc_next_tx % LMC_TXDESCS;
1437 
1438     sc->lmc_txq[entry] = skb;
1439     sc->lmc_txring[entry].buffer1 = virt_to_bus (skb->data);
1440 
1441     LMC_CONSOLE_LOG("xmit", skb->data, skb->len);
1442 
1443 #ifndef GCOM
1444     /* If the queue is less than half full, don't interrupt */
1445     if (sc->lmc_next_tx - sc->lmc_taint_tx < LMC_TXDESCS / 2)
1446     {
1447         /* Do not interrupt on completion of this packet */
1448         flag = 0x60000000;
1449         netif_wake_queue(dev);
1450     }
1451     else if (sc->lmc_next_tx - sc->lmc_taint_tx == LMC_TXDESCS / 2)
1452     {
1453         /* This generates an interrupt on completion of this packet */
1454         flag = 0xe0000000;
1455         netif_wake_queue(dev);
1456     }
1457     else if (sc->lmc_next_tx - sc->lmc_taint_tx < LMC_TXDESCS - 1)
1458     {
1459         /* Do not interrupt on completion of this packet */
1460         flag = 0x60000000;
1461         netif_wake_queue(dev);
1462     }
1463     else
1464     {
1465         /* This generates an interrupt on completion of this packet */
1466         flag = 0xe0000000;
1467         sc->lmc_txfull = 1;
1468         netif_stop_queue(dev);
1469     }
1470 #else
1471     flag = LMC_TDES_INTERRUPT_ON_COMPLETION;
1472 
1473     if (sc->lmc_next_tx - sc->lmc_taint_tx >= LMC_TXDESCS - 1)
1474     {                           /* ring full, go busy */
1475         sc->lmc_txfull = 1;
1476         netif_stop_queue(dev);
1477         sc->extra_stats.tx_tbusy1++;
1478         LMC_EVENT_LOG(LMC_EVENT_TBUSY1, entry, 0);
1479     }
1480 #endif
1481 
1482 
1483     if (entry == LMC_TXDESCS - 1)       /* last descriptor in ring */
1484         flag |= LMC_TDES_END_OF_RING;   /* flag as such for Tulip */
1485 
1486     /* don't pad small packets either */
1487     flag = sc->lmc_txring[entry].length = (skb->len) | flag |
1488                                                 sc->TxDescriptControlInit;
1489 
1490     /* set the transmit timeout flag to be checked in
1491      * the watchdog timer handler. -baz
1492      */
1493 
1494     sc->extra_stats.tx_NoCompleteCnt++;
1495     sc->lmc_next_tx++;
1496 
1497     /* give ownership to the chip */
1498     LMC_EVENT_LOG(LMC_EVENT_XMT, flag, entry);
1499     sc->lmc_txring[entry].status = 0x80000000;
1500 
1501     /* send now! */
1502     LMC_CSR_WRITE (sc, csr_txpoll, 0);
1503 
1504     spin_unlock_irqrestore(&sc->lmc_lock, flags);
1505 
1506     lmc_trace(dev, "lmc_start_xmit_out");
1507     return NETDEV_TX_OK;
1508 }
1509 
1510 
1511 static int lmc_rx(struct net_device *dev)
1512 {
1513     lmc_softc_t *sc = dev_to_sc(dev);
1514     int i;
1515     int rx_work_limit = LMC_RXDESCS;
1516     unsigned int next_rx;
1517     int rxIntLoopCnt;           /* debug -baz */
1518     int localLengthErrCnt = 0;
1519     long stat;
1520     struct sk_buff *skb, *nsb;
1521     u16 len;
1522 
1523     lmc_trace(dev, "lmc_rx in");
1524 
1525     lmc_led_on(sc, LMC_DS3_LED3);
1526 
1527     rxIntLoopCnt = 0;           /* debug -baz */
1528 
1529     i = sc->lmc_next_rx % LMC_RXDESCS;
1530     next_rx = sc->lmc_next_rx;
1531 
1532     while (((stat = sc->lmc_rxring[i].status) & LMC_RDES_OWN_BIT) != DESC_OWNED_BY_DC21X4)
1533     {
1534         rxIntLoopCnt++;         /* debug -baz */
1535         len = ((stat & LMC_RDES_FRAME_LENGTH) >> RDES_FRAME_LENGTH_BIT_NUMBER);
1536         if ((stat & 0x0300) != 0x0300) {  /* Check first segment and last segment */
1537                 if ((stat & 0x0000ffff) != 0x7fff) {
1538                         /* Oversized frame */
1539                         sc->lmc_device->stats.rx_length_errors++;
1540                         goto skip_packet;
1541                 }
1542         }
1543 
1544         if (stat & 0x00000008) { /* Catch a dribbling bit error */
1545                 sc->lmc_device->stats.rx_errors++;
1546                 sc->lmc_device->stats.rx_frame_errors++;
1547                 goto skip_packet;
1548         }
1549 
1550 
1551         if (stat & 0x00000004) { /* Catch a CRC error by the Xilinx */
1552                 sc->lmc_device->stats.rx_errors++;
1553                 sc->lmc_device->stats.rx_crc_errors++;
1554                 goto skip_packet;
1555         }
1556 
1557         if (len > LMC_PKT_BUF_SZ) {
1558                 sc->lmc_device->stats.rx_length_errors++;
1559                 localLengthErrCnt++;
1560                 goto skip_packet;
1561         }
1562 
1563         if (len < sc->lmc_crcSize + 2) {
1564                 sc->lmc_device->stats.rx_length_errors++;
1565                 sc->extra_stats.rx_SmallPktCnt++;
1566                 localLengthErrCnt++;
1567                 goto skip_packet;
1568         }
1569 
1570         if(stat & 0x00004000){
1571             printk(KERN_WARNING "%s: Receiver descriptor error, receiver out of sync?\n", dev->name);
1572         }
1573 
1574         len -= sc->lmc_crcSize;
1575 
1576         skb = sc->lmc_rxq[i];
1577 
1578         /*
1579          * We ran out of memory at some point
1580          * just allocate an skb buff and continue.
1581          */
1582         
1583         if (!skb) {
1584             nsb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
1585             if (nsb) {
1586                 sc->lmc_rxq[i] = nsb;
1587                 nsb->dev = dev;
1588                 sc->lmc_rxring[i].buffer1 = virt_to_bus(skb_tail_pointer(nsb));
1589             }
1590             sc->failed_recv_alloc = 1;
1591             goto skip_packet;
1592         }
1593         
1594         sc->lmc_device->stats.rx_packets++;
1595         sc->lmc_device->stats.rx_bytes += len;
1596 
1597         LMC_CONSOLE_LOG("recv", skb->data, len);
1598 
1599         /*
1600          * I'm not sure of the sanity of this
1601          * Packets could be arriving at a constant
1602          * 44.210mbits/sec and we're going to copy
1603          * them into a new buffer??
1604          */
1605         
1606         if(len > (LMC_MTU - (LMC_MTU>>2))){ /* len > LMC_MTU * 0.75 */
1607             /*
1608              * If it's a large packet don't copy it just hand it up
1609              */
1610         give_it_anyways:
1611 
1612             sc->lmc_rxq[i] = NULL;
1613             sc->lmc_rxring[i].buffer1 = 0x0;
1614 
1615             skb_put (skb, len);
1616             skb->protocol = lmc_proto_type(sc, skb);
1617             skb_reset_mac_header(skb);
1618             /* skb_reset_network_header(skb); */
1619             skb->dev = dev;
1620             lmc_proto_netif(sc, skb);
1621 
1622             /*
1623              * This skb will be destroyed by the upper layers, make a new one
1624              */
1625             nsb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
1626             if (nsb) {
1627                 sc->lmc_rxq[i] = nsb;
1628                 nsb->dev = dev;
1629                 sc->lmc_rxring[i].buffer1 = virt_to_bus(skb_tail_pointer(nsb));
1630                 /* Transferred to 21140 below */
1631             }
1632             else {
1633                 /*
1634                  * We've run out of memory, stop trying to allocate
1635                  * memory and exit the interrupt handler
1636                  *
1637                  * The chip may run out of receivers and stop
1638                  * in which care we'll try to allocate the buffer
1639                  * again.  (once a second)
1640                  */
1641                 sc->extra_stats.rx_BuffAllocErr++;
1642                 LMC_EVENT_LOG(LMC_EVENT_RCVINT, stat, len);
1643                 sc->failed_recv_alloc = 1;
1644                 goto skip_out_of_mem;
1645             }
1646         }
1647         else {
1648             nsb = dev_alloc_skb(len);
1649             if(!nsb) {
1650                 goto give_it_anyways;
1651             }
1652             skb_copy_from_linear_data(skb, skb_put(nsb, len), len);
1653             
1654             nsb->protocol = lmc_proto_type(sc, nsb);
1655             skb_reset_mac_header(nsb);
1656             /* skb_reset_network_header(nsb); */
1657             nsb->dev = dev;
1658             lmc_proto_netif(sc, nsb);
1659         }
1660 
1661     skip_packet:
1662         LMC_EVENT_LOG(LMC_EVENT_RCVINT, stat, len);
1663         sc->lmc_rxring[i].status = DESC_OWNED_BY_DC21X4;
1664 
1665         sc->lmc_next_rx++;
1666         i = sc->lmc_next_rx % LMC_RXDESCS;
1667         rx_work_limit--;
1668         if (rx_work_limit < 0)
1669             break;
1670     }
1671 
1672     /* detect condition for LMC1000 where DSU cable attaches and fills
1673      * descriptors with bogus packets
1674      *
1675     if (localLengthErrCnt > LMC_RXDESCS - 3) {
1676         sc->extra_stats.rx_BadPktSurgeCnt++;
1677         LMC_EVENT_LOG(LMC_EVENT_BADPKTSURGE, localLengthErrCnt,
1678                       sc->extra_stats.rx_BadPktSurgeCnt);
1679     } */
1680 
1681     /* save max count of receive descriptors serviced */
1682     if (rxIntLoopCnt > sc->extra_stats.rxIntLoopCnt)
1683             sc->extra_stats.rxIntLoopCnt = rxIntLoopCnt; /* debug -baz */
1684 
1685 #ifdef DEBUG
1686     if (rxIntLoopCnt == 0)
1687     {
1688         for (i = 0; i < LMC_RXDESCS; i++)
1689         {
1690             if ((sc->lmc_rxring[i].status & LMC_RDES_OWN_BIT)
1691                 != DESC_OWNED_BY_DC21X4)
1692             {
1693                 rxIntLoopCnt++;
1694             }
1695         }
1696         LMC_EVENT_LOG(LMC_EVENT_RCVEND, rxIntLoopCnt, 0);
1697     }
1698 #endif
1699 
1700 
1701     lmc_led_off(sc, LMC_DS3_LED3);
1702 
1703 skip_out_of_mem:
1704 
1705     lmc_trace(dev, "lmc_rx out");
1706 
1707     return 0;
1708 }
1709 
1710 static struct net_device_stats *lmc_get_stats(struct net_device *dev)
1711 {
1712     lmc_softc_t *sc = dev_to_sc(dev);
1713     unsigned long flags;
1714 
1715     lmc_trace(dev, "lmc_get_stats in");
1716 
1717     spin_lock_irqsave(&sc->lmc_lock, flags);
1718 
1719     sc->lmc_device->stats.rx_missed_errors += LMC_CSR_READ(sc, csr_missed_frames) & 0xffff;
1720 
1721     spin_unlock_irqrestore(&sc->lmc_lock, flags);
1722 
1723     lmc_trace(dev, "lmc_get_stats out");
1724 
1725     return &sc->lmc_device->stats;
1726 }
1727 
1728 static struct pci_driver lmc_driver = {
1729         .name           = "lmc",
1730         .id_table       = lmc_pci_tbl,
1731         .probe          = lmc_init_one,
1732         .remove         = lmc_remove_one,
1733 };
1734 
1735 module_pci_driver(lmc_driver);
1736 
1737 unsigned lmc_mii_readreg (lmc_softc_t * const sc, unsigned devaddr, unsigned regno) /*fold00*/
1738 {
1739     int i;
1740     int command = (0xf6 << 10) | (devaddr << 5) | regno;
1741     int retval = 0;
1742 
1743     lmc_trace(sc->lmc_device, "lmc_mii_readreg in");
1744 
1745     LMC_MII_SYNC (sc);
1746 
1747     lmc_trace(sc->lmc_device, "lmc_mii_readreg: done sync");
1748 
1749     for (i = 15; i >= 0; i--)
1750     {
1751         int dataval = (command & (1 << i)) ? 0x20000 : 0;
1752 
1753         LMC_CSR_WRITE (sc, csr_9, dataval);
1754         lmc_delay ();
1755         /* __SLOW_DOWN_IO; */
1756         LMC_CSR_WRITE (sc, csr_9, dataval | 0x10000);
1757         lmc_delay ();
1758         /* __SLOW_DOWN_IO; */
1759     }
1760 
1761     lmc_trace(sc->lmc_device, "lmc_mii_readreg: done1");
1762 
1763     for (i = 19; i > 0; i--)
1764     {
1765         LMC_CSR_WRITE (sc, csr_9, 0x40000);
1766         lmc_delay ();
1767         /* __SLOW_DOWN_IO; */
1768         retval = (retval << 1) | ((LMC_CSR_READ (sc, csr_9) & 0x80000) ? 1 : 0);
1769         LMC_CSR_WRITE (sc, csr_9, 0x40000 | 0x10000);
1770         lmc_delay ();
1771         /* __SLOW_DOWN_IO; */
1772     }
1773 
1774     lmc_trace(sc->lmc_device, "lmc_mii_readreg out");
1775 
1776     return (retval >> 1) & 0xffff;
1777 }
1778 
1779 void lmc_mii_writereg (lmc_softc_t * const sc, unsigned devaddr, unsigned regno, unsigned data) /*fold00*/
1780 {
1781     int i = 32;
1782     int command = (0x5002 << 16) | (devaddr << 23) | (regno << 18) | data;
1783 
1784     lmc_trace(sc->lmc_device, "lmc_mii_writereg in");
1785 
1786     LMC_MII_SYNC (sc);
1787 
1788     i = 31;
1789     while (i >= 0)
1790     {
1791         int datav;
1792 
1793         if (command & (1 << i))
1794             datav = 0x20000;
1795         else
1796             datav = 0x00000;
1797 
1798         LMC_CSR_WRITE (sc, csr_9, datav);
1799         lmc_delay ();
1800         /* __SLOW_DOWN_IO; */
1801         LMC_CSR_WRITE (sc, csr_9, (datav | 0x10000));
1802         lmc_delay ();
1803         /* __SLOW_DOWN_IO; */
1804         i--;
1805     }
1806 
1807     i = 2;
1808     while (i > 0)
1809     {
1810         LMC_CSR_WRITE (sc, csr_9, 0x40000);
1811         lmc_delay ();
1812         /* __SLOW_DOWN_IO; */
1813         LMC_CSR_WRITE (sc, csr_9, 0x50000);
1814         lmc_delay ();
1815         /* __SLOW_DOWN_IO; */
1816         i--;
1817     }
1818 
1819     lmc_trace(sc->lmc_device, "lmc_mii_writereg out");
1820 }
1821 
1822 static void lmc_softreset (lmc_softc_t * const sc) /*fold00*/
1823 {
1824     int i;
1825 
1826     lmc_trace(sc->lmc_device, "lmc_softreset in");
1827 
1828     /* Initialize the receive rings and buffers. */
1829     sc->lmc_txfull = 0;
1830     sc->lmc_next_rx = 0;
1831     sc->lmc_next_tx = 0;
1832     sc->lmc_taint_rx = 0;
1833     sc->lmc_taint_tx = 0;
1834 
1835     /*
1836      * Setup each one of the receiver buffers
1837      * allocate an skbuff for each one, setup the descriptor table
1838      * and point each buffer at the next one
1839      */
1840 
1841     for (i = 0; i < LMC_RXDESCS; i++)
1842     {
1843         struct sk_buff *skb;
1844 
1845         if (sc->lmc_rxq[i] == NULL)
1846         {
1847             skb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
1848             if(skb == NULL){
1849                 printk(KERN_WARNING "%s: Failed to allocate receiver ring, will try again\n", sc->name);
1850                 sc->failed_ring = 1;
1851                 break;
1852             }
1853             else{
1854                 sc->lmc_rxq[i] = skb;
1855             }
1856         }
1857         else
1858         {
1859             skb = sc->lmc_rxq[i];
1860         }
1861 
1862         skb->dev = sc->lmc_device;
1863 
1864         /* owned by 21140 */
1865         sc->lmc_rxring[i].status = 0x80000000;
1866 
1867         /* used to be PKT_BUF_SZ now uses skb since we lose some to head room */
1868         sc->lmc_rxring[i].length = skb_tailroom(skb);
1869 
1870         /* use to be tail which is dumb since you're thinking why write
1871          * to the end of the packj,et but since there's nothing there tail == data
1872          */
1873         sc->lmc_rxring[i].buffer1 = virt_to_bus (skb->data);
1874 
1875         /* This is fair since the structure is static and we have the next address */
1876         sc->lmc_rxring[i].buffer2 = virt_to_bus (&sc->lmc_rxring[i + 1]);
1877 
1878     }
1879 
1880     /*
1881      * Sets end of ring
1882      */
1883     if (i != 0) {
1884         sc->lmc_rxring[i - 1].length |= 0x02000000; /* Set end of buffers flag */
1885         sc->lmc_rxring[i - 1].buffer2 = virt_to_bus(&sc->lmc_rxring[0]); /* Point back to the start */
1886     }
1887     LMC_CSR_WRITE (sc, csr_rxlist, virt_to_bus (sc->lmc_rxring)); /* write base address */
1888 
1889     /* Initialize the transmit rings and buffers */
1890     for (i = 0; i < LMC_TXDESCS; i++)
1891     {
1892         if (sc->lmc_txq[i] != NULL){            /* have buffer */
1893             dev_kfree_skb(sc->lmc_txq[i]);      /* free it */
1894             sc->lmc_device->stats.tx_dropped++; /* We just dropped a packet */
1895         }
1896         sc->lmc_txq[i] = NULL;
1897         sc->lmc_txring[i].status = 0x00000000;
1898         sc->lmc_txring[i].buffer2 = virt_to_bus (&sc->lmc_txring[i + 1]);
1899     }
1900     sc->lmc_txring[i - 1].buffer2 = virt_to_bus (&sc->lmc_txring[0]);
1901     LMC_CSR_WRITE (sc, csr_txlist, virt_to_bus (sc->lmc_txring));
1902 
1903     lmc_trace(sc->lmc_device, "lmc_softreset out");
1904 }
1905 
1906 void lmc_gpio_mkinput(lmc_softc_t * const sc, u32 bits) /*fold00*/
1907 {
1908     lmc_trace(sc->lmc_device, "lmc_gpio_mkinput in");
1909     sc->lmc_gpio_io &= ~bits;
1910     LMC_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET | (sc->lmc_gpio_io));
1911     lmc_trace(sc->lmc_device, "lmc_gpio_mkinput out");
1912 }
1913 
1914 void lmc_gpio_mkoutput(lmc_softc_t * const sc, u32 bits) /*fold00*/
1915 {
1916     lmc_trace(sc->lmc_device, "lmc_gpio_mkoutput in");
1917     sc->lmc_gpio_io |= bits;
1918     LMC_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET | (sc->lmc_gpio_io));
1919     lmc_trace(sc->lmc_device, "lmc_gpio_mkoutput out");
1920 }
1921 
1922 void lmc_led_on(lmc_softc_t * const sc, u32 led) /*fold00*/
1923 {
1924     lmc_trace(sc->lmc_device, "lmc_led_on in");
1925     if((~sc->lmc_miireg16) & led){ /* Already on! */
1926         lmc_trace(sc->lmc_device, "lmc_led_on aon out");
1927         return;
1928     }
1929     
1930     sc->lmc_miireg16 &= ~led;
1931     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
1932     lmc_trace(sc->lmc_device, "lmc_led_on out");
1933 }
1934 
1935 void lmc_led_off(lmc_softc_t * const sc, u32 led) /*fold00*/
1936 {
1937     lmc_trace(sc->lmc_device, "lmc_led_off in");
1938     if(sc->lmc_miireg16 & led){ /* Already set don't do anything */
1939         lmc_trace(sc->lmc_device, "lmc_led_off aoff out");
1940         return;
1941     }
1942     
1943     sc->lmc_miireg16 |= led;
1944     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
1945     lmc_trace(sc->lmc_device, "lmc_led_off out");
1946 }
1947 
1948 static void lmc_reset(lmc_softc_t * const sc) /*fold00*/
1949 {
1950     lmc_trace(sc->lmc_device, "lmc_reset in");
1951     sc->lmc_miireg16 |= LMC_MII16_FIFO_RESET;
1952     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
1953 
1954     sc->lmc_miireg16 &= ~LMC_MII16_FIFO_RESET;
1955     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
1956 
1957     /*
1958      * make some of the GPIO pins be outputs
1959      */
1960     lmc_gpio_mkoutput(sc, LMC_GEP_RESET);
1961 
1962     /*
1963      * RESET low to force state reset.  This also forces
1964      * the transmitter clock to be internal, but we expect to reset
1965      * that later anyway.
1966      */
1967     sc->lmc_gpio &= ~(LMC_GEP_RESET);
1968     LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
1969 
1970     /*
1971      * hold for more than 10 microseconds
1972      */
1973     udelay(50);
1974 
1975     /*
1976      * stop driving Xilinx-related signals
1977      */
1978     lmc_gpio_mkinput(sc, LMC_GEP_RESET);
1979 
1980     /*
1981      * Call media specific init routine
1982      */
1983     sc->lmc_media->init(sc);
1984 
1985     sc->extra_stats.resetCount++;
1986     lmc_trace(sc->lmc_device, "lmc_reset out");
1987 }
1988 
1989 static void lmc_dec_reset(lmc_softc_t * const sc) /*fold00*/
1990 {
1991     u32 val;
1992     lmc_trace(sc->lmc_device, "lmc_dec_reset in");
1993 
1994     /*
1995      * disable all interrupts
1996      */
1997     sc->lmc_intrmask = 0;
1998     LMC_CSR_WRITE(sc, csr_intr, sc->lmc_intrmask);
1999 
2000     /*
2001      * Reset the chip with a software reset command.
2002      * Wait 10 microseconds (actually 50 PCI cycles but at
2003      * 33MHz that comes to two microseconds but wait a
2004      * bit longer anyways)
2005      */
2006     LMC_CSR_WRITE(sc, csr_busmode, TULIP_BUSMODE_SWRESET);
2007     udelay(25);
2008 #ifdef __sparc__
2009     sc->lmc_busmode = LMC_CSR_READ(sc, csr_busmode);
2010     sc->lmc_busmode = 0x00100000;
2011     sc->lmc_busmode &= ~TULIP_BUSMODE_SWRESET;
2012     LMC_CSR_WRITE(sc, csr_busmode, sc->lmc_busmode);
2013 #endif
2014     sc->lmc_cmdmode = LMC_CSR_READ(sc, csr_command);
2015 
2016     /*
2017      * We want:
2018      *   no ethernet address in frames we write
2019      *   disable padding (txdesc, padding disable)
2020      *   ignore runt frames (rdes0 bit 15)
2021      *   no receiver watchdog or transmitter jabber timer
2022      *       (csr15 bit 0,14 == 1)
2023      *   if using 16-bit CRC, turn off CRC (trans desc, crc disable)
2024      */
2025 
2026     sc->lmc_cmdmode |= ( TULIP_CMD_PROMISCUOUS
2027                          | TULIP_CMD_FULLDUPLEX
2028                          | TULIP_CMD_PASSBADPKT
2029                          | TULIP_CMD_NOHEARTBEAT
2030                          | TULIP_CMD_PORTSELECT
2031                          | TULIP_CMD_RECEIVEALL
2032                          | TULIP_CMD_MUSTBEONE
2033                        );
2034     sc->lmc_cmdmode &= ~( TULIP_CMD_OPERMODE
2035                           | TULIP_CMD_THRESHOLDCTL
2036                           | TULIP_CMD_STOREFWD
2037                           | TULIP_CMD_TXTHRSHLDCTL
2038                         );
2039 
2040     LMC_CSR_WRITE(sc, csr_command, sc->lmc_cmdmode);
2041 
2042     /*
2043      * disable receiver watchdog and transmit jabber
2044      */
2045     val = LMC_CSR_READ(sc, csr_sia_general);
2046     val |= (TULIP_WATCHDOG_TXDISABLE | TULIP_WATCHDOG_RXDISABLE);
2047     LMC_CSR_WRITE(sc, csr_sia_general, val);
2048 
2049     lmc_trace(sc->lmc_device, "lmc_dec_reset out");
2050 }
2051 
2052 static void lmc_initcsrs(lmc_softc_t * const sc, lmc_csrptr_t csr_base, /*fold00*/
2053                          size_t csr_size)
2054 {
2055     lmc_trace(sc->lmc_device, "lmc_initcsrs in");
2056     sc->lmc_csrs.csr_busmode            = csr_base +  0 * csr_size;
2057     sc->lmc_csrs.csr_txpoll             = csr_base +  1 * csr_size;
2058     sc->lmc_csrs.csr_rxpoll             = csr_base +  2 * csr_size;
2059     sc->lmc_csrs.csr_rxlist             = csr_base +  3 * csr_size;
2060     sc->lmc_csrs.csr_txlist             = csr_base +  4 * csr_size;
2061     sc->lmc_csrs.csr_status             = csr_base +  5 * csr_size;
2062     sc->lmc_csrs.csr_command            = csr_base +  6 * csr_size;
2063     sc->lmc_csrs.csr_intr               = csr_base +  7 * csr_size;
2064     sc->lmc_csrs.csr_missed_frames      = csr_base +  8 * csr_size;
2065     sc->lmc_csrs.csr_9                  = csr_base +  9 * csr_size;
2066     sc->lmc_csrs.csr_10                 = csr_base + 10 * csr_size;
2067     sc->lmc_csrs.csr_11                 = csr_base + 11 * csr_size;
2068     sc->lmc_csrs.csr_12                 = csr_base + 12 * csr_size;
2069     sc->lmc_csrs.csr_13                 = csr_base + 13 * csr_size;
2070     sc->lmc_csrs.csr_14                 = csr_base + 14 * csr_size;
2071     sc->lmc_csrs.csr_15                 = csr_base + 15 * csr_size;
2072     lmc_trace(sc->lmc_device, "lmc_initcsrs out");
2073 }
2074 
2075 static void lmc_driver_timeout(struct net_device *dev)
2076 {
2077     lmc_softc_t *sc = dev_to_sc(dev);
2078     u32 csr6;
2079     unsigned long flags;
2080 
2081     lmc_trace(dev, "lmc_driver_timeout in");
2082 
2083     spin_lock_irqsave(&sc->lmc_lock, flags);
2084 
2085     printk("%s: Xmitter busy|\n", dev->name);
2086 
2087     sc->extra_stats.tx_tbusy_calls++;
2088     if (jiffies - dev_trans_start(dev) < TX_TIMEOUT)
2089             goto bug_out;
2090 
2091     /*
2092      * Chip seems to have locked up
2093      * Reset it
2094      * This whips out all our decriptor
2095      * table and starts from scartch
2096      */
2097 
2098     LMC_EVENT_LOG(LMC_EVENT_XMTPRCTMO,
2099                   LMC_CSR_READ (sc, csr_status),
2100                   sc->extra_stats.tx_ProcTimeout);
2101 
2102     lmc_running_reset (dev);
2103 
2104     LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ (sc, csr_status), 0);
2105     LMC_EVENT_LOG(LMC_EVENT_RESET2,
2106                   lmc_mii_readreg (sc, 0, 16),
2107                   lmc_mii_readreg (sc, 0, 17));
2108 
2109     /* restart the tx processes */
2110     csr6 = LMC_CSR_READ (sc, csr_command);
2111     LMC_CSR_WRITE (sc, csr_command, csr6 | 0x0002);
2112     LMC_CSR_WRITE (sc, csr_command, csr6 | 0x2002);
2113 
2114     /* immediate transmit */
2115     LMC_CSR_WRITE (sc, csr_txpoll, 0);
2116 
2117     sc->lmc_device->stats.tx_errors++;
2118     sc->extra_stats.tx_ProcTimeout++; /* -baz */
2119 
2120     dev->trans_start = jiffies; /* prevent tx timeout */
2121 
2122 bug_out:
2123 
2124     spin_unlock_irqrestore(&sc->lmc_lock, flags);
2125 
2126     lmc_trace(dev, "lmc_driver_timeout out");
2127 
2128 
2129 }
2130 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us