Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

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                 err = -ENOMEM;
854                 goto err_hdlcdev;
855         }
856 
857 
858         dev->type = ARPHRD_HDLC;
859         dev_to_hdlc(dev)->xmit = lmc_start_xmit;
860         dev_to_hdlc(dev)->attach = lmc_attach;
861         dev->netdev_ops = &lmc_ops;
862         dev->watchdog_timeo = HZ; /* 1 second */
863         dev->tx_queue_len = 100;
864         sc->lmc_device = dev;
865         sc->name = dev->name;
866         sc->if_type = LMC_PPP;
867         sc->check = 0xBEAFCAFE;
868         dev->base_addr = pci_resource_start(pdev, 0);
869         dev->irq = pdev->irq;
870         pci_set_drvdata(pdev, dev);
871         SET_NETDEV_DEV(dev, &pdev->dev);
872 
873         /*
874          * This will get the protocol layer ready and do any 1 time init's
875          * Must have a valid sc and dev structure
876          */
877         lmc_proto_attach(sc);
878 
879         /* Init the spin lock so can call it latter */
880 
881         spin_lock_init(&sc->lmc_lock);
882         pci_set_master(pdev);
883 
884         printk(KERN_INFO "%s: detected at %lx, irq %d\n", dev->name,
885                dev->base_addr, dev->irq);
886 
887         err = register_hdlc_device(dev);
888         if (err) {
889                 printk(KERN_ERR "%s: register_netdev failed.\n", dev->name);
890                 free_netdev(dev);
891                 goto err_hdlcdev;
892         }
893 
894     sc->lmc_cardtype = LMC_CARDTYPE_UNKNOWN;
895     sc->lmc_timing = LMC_CTL_CLOCK_SOURCE_EXT;
896 
897     /*
898      *
899      * Check either the subvendor or the subdevice, some systems reverse
900      * the setting in the bois, seems to be version and arch dependent?
901      * Fix the error, exchange the two values 
902      */
903     if ((subdevice = pdev->subsystem_device) == PCI_VENDOR_ID_LMC)
904             subdevice = pdev->subsystem_vendor;
905 
906     switch (subdevice) {
907     case PCI_DEVICE_ID_LMC_HSSI:
908         printk(KERN_INFO "%s: LMC HSSI\n", dev->name);
909         sc->lmc_cardtype = LMC_CARDTYPE_HSSI;
910         sc->lmc_media = &lmc_hssi_media;
911         break;
912     case PCI_DEVICE_ID_LMC_DS3:
913         printk(KERN_INFO "%s: LMC DS3\n", dev->name);
914         sc->lmc_cardtype = LMC_CARDTYPE_DS3;
915         sc->lmc_media = &lmc_ds3_media;
916         break;
917     case PCI_DEVICE_ID_LMC_SSI:
918         printk(KERN_INFO "%s: LMC SSI\n", dev->name);
919         sc->lmc_cardtype = LMC_CARDTYPE_SSI;
920         sc->lmc_media = &lmc_ssi_media;
921         break;
922     case PCI_DEVICE_ID_LMC_T1:
923         printk(KERN_INFO "%s: LMC T1\n", dev->name);
924         sc->lmc_cardtype = LMC_CARDTYPE_T1;
925         sc->lmc_media = &lmc_t1_media;
926         break;
927     default:
928         printk(KERN_WARNING "%s: LMC UNKNOWN CARD!\n", dev->name);
929         break;
930     }
931 
932     lmc_initcsrs (sc, dev->base_addr, 8);
933 
934     lmc_gpio_mkinput (sc, 0xff);
935     sc->lmc_gpio = 0;           /* drive no signals yet */
936 
937     sc->lmc_media->defaults (sc);
938 
939     sc->lmc_media->set_link_status (sc, LMC_LINK_UP);
940 
941     /* verify that the PCI Sub System ID matches the Adapter Model number
942      * from the MII register
943      */
944     AdapModelNum = (lmc_mii_readreg (sc, 0, 3) & 0x3f0) >> 4;
945 
946     if ((AdapModelNum != LMC_ADAP_T1 || /* detect LMC1200 */
947          subdevice != PCI_DEVICE_ID_LMC_T1) &&
948         (AdapModelNum != LMC_ADAP_SSI || /* detect LMC1000 */
949          subdevice != PCI_DEVICE_ID_LMC_SSI) &&
950         (AdapModelNum != LMC_ADAP_DS3 || /* detect LMC5245 */
951          subdevice != PCI_DEVICE_ID_LMC_DS3) &&
952         (AdapModelNum != LMC_ADAP_HSSI || /* detect LMC5200 */
953          subdevice != PCI_DEVICE_ID_LMC_HSSI))
954             printk(KERN_WARNING "%s: Model number (%d) miscompare for PCI"
955                    " Subsystem ID = 0x%04x\n",
956                    dev->name, AdapModelNum, subdevice);
957 
958     /*
959      * reset clock
960      */
961     LMC_CSR_WRITE (sc, csr_gp_timer, 0xFFFFFFFFUL);
962 
963     sc->board_idx = cards_found++;
964     sc->extra_stats.check = STATCHECK;
965     sc->extra_stats.version_size = (DRIVER_VERSION << 16) +
966             sizeof(sc->lmc_device->stats) + sizeof(sc->extra_stats);
967     sc->extra_stats.lmc_cardtype = sc->lmc_cardtype;
968 
969     sc->lmc_ok = 0;
970     sc->last_link_status = 0;
971 
972     lmc_trace(dev, "lmc_init_one out");
973     return 0;
974 
975 err_hdlcdev:
976         kfree(sc);
977 err_kzalloc:
978         pci_release_regions(pdev);
979 err_req_io:
980         pci_disable_device(pdev);
981         return err;
982 }
983 
984 /*
985  * Called from pci when removing module.
986  */
987 static void lmc_remove_one(struct pci_dev *pdev)
988 {
989         struct net_device *dev = pci_get_drvdata(pdev);
990 
991         if (dev) {
992                 printk(KERN_DEBUG "%s: removing...\n", dev->name);
993                 unregister_hdlc_device(dev);
994                 free_netdev(dev);
995                 pci_release_regions(pdev);
996                 pci_disable_device(pdev);
997         }
998 }
999 
1000 /* After this is called, packets can be sent.
1001  * Does not initialize the addresses
1002  */
1003 static int lmc_open(struct net_device *dev)
1004 {
1005     lmc_softc_t *sc = dev_to_sc(dev);
1006     int err;
1007 
1008     lmc_trace(dev, "lmc_open in");
1009 
1010     lmc_led_on(sc, LMC_DS3_LED0);
1011 
1012     lmc_dec_reset(sc);
1013     lmc_reset(sc);
1014 
1015     LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ(sc, csr_status), 0);
1016     LMC_EVENT_LOG(LMC_EVENT_RESET2, lmc_mii_readreg(sc, 0, 16),
1017                   lmc_mii_readreg(sc, 0, 17));
1018 
1019     if (sc->lmc_ok){
1020         lmc_trace(dev, "lmc_open lmc_ok out");
1021         return 0;
1022     }
1023 
1024     lmc_softreset (sc);
1025 
1026     /* Since we have to use PCI bus, this should work on x86,alpha,ppc */
1027     if (request_irq (dev->irq, lmc_interrupt, IRQF_SHARED, dev->name, dev)){
1028         printk(KERN_WARNING "%s: could not get irq: %d\n", dev->name, dev->irq);
1029         lmc_trace(dev, "lmc_open irq failed out");
1030         return -EAGAIN;
1031     }
1032     sc->got_irq = 1;
1033 
1034     /* Assert Terminal Active */
1035     sc->lmc_miireg16 |= LMC_MII16_LED_ALL;
1036     sc->lmc_media->set_link_status (sc, LMC_LINK_UP);
1037 
1038     /*
1039      * reset to last state.
1040      */
1041     sc->lmc_media->set_status (sc, NULL);
1042 
1043     /* setup default bits to be used in tulip_desc_t transmit descriptor
1044      * -baz */
1045     sc->TxDescriptControlInit = (
1046                                  LMC_TDES_INTERRUPT_ON_COMPLETION
1047                                  | LMC_TDES_FIRST_SEGMENT
1048                                  | LMC_TDES_LAST_SEGMENT
1049                                  | LMC_TDES_SECOND_ADDR_CHAINED
1050                                  | LMC_TDES_DISABLE_PADDING
1051                                 );
1052 
1053     if (sc->ictl.crc_length == LMC_CTL_CRC_LENGTH_16) {
1054         /* disable 32 bit CRC generated by ASIC */
1055         sc->TxDescriptControlInit |= LMC_TDES_ADD_CRC_DISABLE;
1056     }
1057     sc->lmc_media->set_crc_length(sc, sc->ictl.crc_length);
1058     /* Acknoledge the Terminal Active and light LEDs */
1059 
1060     /* dev->flags |= IFF_UP; */
1061 
1062     if ((err = lmc_proto_open(sc)) != 0)
1063             return err;
1064 
1065     netif_start_queue(dev);
1066     sc->extra_stats.tx_tbusy0++;
1067 
1068     /*
1069      * select what interrupts we want to get
1070      */
1071     sc->lmc_intrmask = 0;
1072     /* Should be using the default interrupt mask defined in the .h file. */
1073     sc->lmc_intrmask |= (TULIP_STS_NORMALINTR
1074                          | TULIP_STS_RXINTR
1075                          | TULIP_STS_TXINTR
1076                          | TULIP_STS_ABNRMLINTR
1077                          | TULIP_STS_SYSERROR
1078                          | TULIP_STS_TXSTOPPED
1079                          | TULIP_STS_TXUNDERFLOW
1080                          | TULIP_STS_RXSTOPPED
1081                          | TULIP_STS_RXNOBUF
1082                         );
1083     LMC_CSR_WRITE (sc, csr_intr, sc->lmc_intrmask);
1084 
1085     sc->lmc_cmdmode |= TULIP_CMD_TXRUN;
1086     sc->lmc_cmdmode |= TULIP_CMD_RXRUN;
1087     LMC_CSR_WRITE (sc, csr_command, sc->lmc_cmdmode);
1088 
1089     sc->lmc_ok = 1; /* Run watchdog */
1090 
1091     /*
1092      * Set the if up now - pfb
1093      */
1094 
1095     sc->last_link_status = 1;
1096 
1097     /*
1098      * Setup a timer for the watchdog on probe, and start it running.
1099      * Since lmc_ok == 0, it will be a NOP for now.
1100      */
1101     init_timer (&sc->timer);
1102     sc->timer.expires = jiffies + HZ;
1103     sc->timer.data = (unsigned long) dev;
1104     sc->timer.function = lmc_watchdog;
1105     add_timer (&sc->timer);
1106 
1107     lmc_trace(dev, "lmc_open out");
1108 
1109     return 0;
1110 }
1111 
1112 /* Total reset to compensate for the AdTran DSU doing bad things
1113  *  under heavy load
1114  */
1115 
1116 static void lmc_running_reset (struct net_device *dev) /*fold00*/
1117 {
1118     lmc_softc_t *sc = dev_to_sc(dev);
1119 
1120     lmc_trace(dev, "lmc_running_reset in");
1121 
1122     /* stop interrupts */
1123     /* Clear the interrupt mask */
1124     LMC_CSR_WRITE (sc, csr_intr, 0x00000000);
1125 
1126     lmc_dec_reset (sc);
1127     lmc_reset (sc);
1128     lmc_softreset (sc);
1129     /* sc->lmc_miireg16 |= LMC_MII16_LED_ALL; */
1130     sc->lmc_media->set_link_status (sc, 1);
1131     sc->lmc_media->set_status (sc, NULL);
1132 
1133     netif_wake_queue(dev);
1134 
1135     sc->lmc_txfull = 0;
1136     sc->extra_stats.tx_tbusy0++;
1137 
1138     sc->lmc_intrmask = TULIP_DEFAULT_INTR_MASK;
1139     LMC_CSR_WRITE (sc, csr_intr, sc->lmc_intrmask);
1140 
1141     sc->lmc_cmdmode |= (TULIP_CMD_TXRUN | TULIP_CMD_RXRUN);
1142     LMC_CSR_WRITE (sc, csr_command, sc->lmc_cmdmode);
1143 
1144     lmc_trace(dev, "lmc_runnin_reset_out");
1145 }
1146 
1147 
1148 /* This is what is called when you ifconfig down a device.
1149  * This disables the timer for the watchdog and keepalives,
1150  * and disables the irq for dev.
1151  */
1152 static int lmc_close(struct net_device *dev)
1153 {
1154     /* not calling release_region() as we should */
1155     lmc_softc_t *sc = dev_to_sc(dev);
1156 
1157     lmc_trace(dev, "lmc_close in");
1158 
1159     sc->lmc_ok = 0;
1160     sc->lmc_media->set_link_status (sc, 0);
1161     del_timer (&sc->timer);
1162     lmc_proto_close(sc);
1163     lmc_ifdown (dev);
1164 
1165     lmc_trace(dev, "lmc_close out");
1166 
1167     return 0;
1168 }
1169 
1170 /* Ends the transfer of packets */
1171 /* When the interface goes down, this is called */
1172 static int lmc_ifdown (struct net_device *dev) /*fold00*/
1173 {
1174     lmc_softc_t *sc = dev_to_sc(dev);
1175     u32 csr6;
1176     int i;
1177 
1178     lmc_trace(dev, "lmc_ifdown in");
1179 
1180     /* Don't let anything else go on right now */
1181     //    dev->start = 0;
1182     netif_stop_queue(dev);
1183     sc->extra_stats.tx_tbusy1++;
1184 
1185     /* stop interrupts */
1186     /* Clear the interrupt mask */
1187     LMC_CSR_WRITE (sc, csr_intr, 0x00000000);
1188 
1189     /* Stop Tx and Rx on the chip */
1190     csr6 = LMC_CSR_READ (sc, csr_command);
1191     csr6 &= ~LMC_DEC_ST;                /* Turn off the Transmission bit */
1192     csr6 &= ~LMC_DEC_SR;                /* Turn off the Receive bit */
1193     LMC_CSR_WRITE (sc, csr_command, csr6);
1194 
1195     sc->lmc_device->stats.rx_missed_errors +=
1196             LMC_CSR_READ(sc, csr_missed_frames) & 0xffff;
1197 
1198     /* release the interrupt */
1199     if(sc->got_irq == 1){
1200         free_irq (dev->irq, dev);
1201         sc->got_irq = 0;
1202     }
1203 
1204     /* free skbuffs in the Rx queue */
1205     for (i = 0; i < LMC_RXDESCS; i++)
1206     {
1207         struct sk_buff *skb = sc->lmc_rxq[i];
1208         sc->lmc_rxq[i] = NULL;
1209         sc->lmc_rxring[i].status = 0;
1210         sc->lmc_rxring[i].length = 0;
1211         sc->lmc_rxring[i].buffer1 = 0xDEADBEEF;
1212         if (skb != NULL)
1213             dev_kfree_skb(skb);
1214         sc->lmc_rxq[i] = NULL;
1215     }
1216 
1217     for (i = 0; i < LMC_TXDESCS; i++)
1218     {
1219         if (sc->lmc_txq[i] != NULL)
1220             dev_kfree_skb(sc->lmc_txq[i]);
1221         sc->lmc_txq[i] = NULL;
1222     }
1223 
1224     lmc_led_off (sc, LMC_MII16_LED_ALL);
1225 
1226     netif_wake_queue(dev);
1227     sc->extra_stats.tx_tbusy0++;
1228 
1229     lmc_trace(dev, "lmc_ifdown out");
1230 
1231     return 0;
1232 }
1233 
1234 /* Interrupt handling routine.  This will take an incoming packet, or clean
1235  * up after a trasmit.
1236  */
1237 static irqreturn_t lmc_interrupt (int irq, void *dev_instance) /*fold00*/
1238 {
1239     struct net_device *dev = (struct net_device *) dev_instance;
1240     lmc_softc_t *sc = dev_to_sc(dev);
1241     u32 csr;
1242     int i;
1243     s32 stat;
1244     unsigned int badtx;
1245     u32 firstcsr;
1246     int max_work = LMC_RXDESCS;
1247     int handled = 0;
1248 
1249     lmc_trace(dev, "lmc_interrupt in");
1250 
1251     spin_lock(&sc->lmc_lock);
1252 
1253     /*
1254      * Read the csr to find what interrupts we have (if any)
1255      */
1256     csr = LMC_CSR_READ (sc, csr_status);
1257 
1258     /*
1259      * Make sure this is our interrupt
1260      */
1261     if ( ! (csr & sc->lmc_intrmask)) {
1262         goto lmc_int_fail_out;
1263     }
1264 
1265     firstcsr = csr;
1266 
1267     /* always go through this loop at least once */
1268     while (csr & sc->lmc_intrmask) {
1269         handled = 1;
1270 
1271         /*
1272          * Clear interrupt bits, we handle all case below
1273          */
1274         LMC_CSR_WRITE (sc, csr_status, csr);
1275 
1276         /*
1277          * One of
1278          *  - Transmit process timed out CSR5<1>
1279          *  - Transmit jabber timeout    CSR5<3>
1280          *  - Transmit underflow         CSR5<5>
1281          *  - Transmit Receiver buffer unavailable CSR5<7>
1282          *  - Receive process stopped    CSR5<8>
1283          *  - Receive watchdog timeout   CSR5<9>
1284          *  - Early transmit interrupt   CSR5<10>
1285          *
1286          * Is this really right? Should we do a running reset for jabber?
1287          * (being a WAN card and all)
1288          */
1289         if (csr & TULIP_STS_ABNRMLINTR){
1290             lmc_running_reset (dev);
1291             break;
1292         }
1293         
1294         if (csr & TULIP_STS_RXINTR){
1295             lmc_trace(dev, "rx interrupt");
1296             lmc_rx (dev);
1297             
1298         }
1299         if (csr & (TULIP_STS_TXINTR | TULIP_STS_TXNOBUF | TULIP_STS_TXSTOPPED)) {
1300 
1301             int         n_compl = 0 ;
1302             /* reset the transmit timeout detection flag -baz */
1303             sc->extra_stats.tx_NoCompleteCnt = 0;
1304 
1305             badtx = sc->lmc_taint_tx;
1306             i = badtx % LMC_TXDESCS;
1307 
1308             while ((badtx < sc->lmc_next_tx)) {
1309                 stat = sc->lmc_txring[i].status;
1310 
1311                 LMC_EVENT_LOG (LMC_EVENT_XMTINT, stat,
1312                                                  sc->lmc_txring[i].length);
1313                 /*
1314                  * If bit 31 is 1 the tulip owns it break out of the loop
1315                  */
1316                 if (stat & 0x80000000)
1317                     break;
1318 
1319                 n_compl++ ;             /* i.e., have an empty slot in ring */
1320                 /*
1321                  * If we have no skbuff or have cleared it
1322                  * Already continue to the next buffer
1323                  */
1324                 if (sc->lmc_txq[i] == NULL)
1325                     continue;
1326 
1327                 /*
1328                  * Check the total error summary to look for any errors
1329                  */
1330                 if (stat & 0x8000) {
1331                         sc->lmc_device->stats.tx_errors++;
1332                         if (stat & 0x4104)
1333                                 sc->lmc_device->stats.tx_aborted_errors++;
1334                         if (stat & 0x0C00)
1335                                 sc->lmc_device->stats.tx_carrier_errors++;
1336                         if (stat & 0x0200)
1337                                 sc->lmc_device->stats.tx_window_errors++;
1338                         if (stat & 0x0002)
1339                                 sc->lmc_device->stats.tx_fifo_errors++;
1340                 } else {
1341                         sc->lmc_device->stats.tx_bytes += sc->lmc_txring[i].length & 0x7ff;
1342 
1343                         sc->lmc_device->stats.tx_packets++;
1344                 }
1345 
1346                 //                dev_kfree_skb(sc->lmc_txq[i]);
1347                 dev_kfree_skb_irq(sc->lmc_txq[i]);
1348                 sc->lmc_txq[i] = NULL;
1349 
1350                 badtx++;
1351                 i = badtx % LMC_TXDESCS;
1352             }
1353 
1354             if (sc->lmc_next_tx - badtx > LMC_TXDESCS)
1355             {
1356                 printk ("%s: out of sync pointer\n", dev->name);
1357                 badtx += LMC_TXDESCS;
1358             }
1359             LMC_EVENT_LOG(LMC_EVENT_TBUSY0, n_compl, 0);
1360             sc->lmc_txfull = 0;
1361             netif_wake_queue(dev);
1362             sc->extra_stats.tx_tbusy0++;
1363 
1364 
1365 #ifdef DEBUG
1366             sc->extra_stats.dirtyTx = badtx;
1367             sc->extra_stats.lmc_next_tx = sc->lmc_next_tx;
1368             sc->extra_stats.lmc_txfull = sc->lmc_txfull;
1369 #endif
1370             sc->lmc_taint_tx = badtx;
1371 
1372             /*
1373              * Why was there a break here???
1374              */
1375         }                       /* end handle transmit interrupt */
1376 
1377         if (csr & TULIP_STS_SYSERROR) {
1378             u32 error;
1379             printk (KERN_WARNING "%s: system bus error csr: %#8.8x\n", dev->name, csr);
1380             error = csr>>23 & 0x7;
1381             switch(error){
1382             case 0x000:
1383                 printk(KERN_WARNING "%s: Parity Fault (bad)\n", dev->name);
1384                 break;
1385             case 0x001:
1386                 printk(KERN_WARNING "%s: Master Abort (naughty)\n", dev->name);
1387                 break;
1388             case 0x010:
1389                 printk(KERN_WARNING "%s: Target Abort (not so naughty)\n", dev->name);
1390                 break;
1391             default:
1392                 printk(KERN_WARNING "%s: This bus error code was supposed to be reserved!\n", dev->name);
1393             }
1394             lmc_dec_reset (sc);
1395             lmc_reset (sc);
1396             LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ (sc, csr_status), 0);
1397             LMC_EVENT_LOG(LMC_EVENT_RESET2,
1398                           lmc_mii_readreg (sc, 0, 16),
1399                           lmc_mii_readreg (sc, 0, 17));
1400 
1401         }
1402 
1403         
1404         if(max_work-- <= 0)
1405             break;
1406         
1407         /*
1408          * Get current csr status to make sure
1409          * we've cleared all interrupts
1410          */
1411         csr = LMC_CSR_READ (sc, csr_status);
1412     }                           /* end interrupt loop */
1413     LMC_EVENT_LOG(LMC_EVENT_INT, firstcsr, csr);
1414 
1415 lmc_int_fail_out:
1416 
1417     spin_unlock(&sc->lmc_lock);
1418 
1419     lmc_trace(dev, "lmc_interrupt out");
1420     return IRQ_RETVAL(handled);
1421 }
1422 
1423 static netdev_tx_t lmc_start_xmit(struct sk_buff *skb,
1424                                         struct net_device *dev)
1425 {
1426     lmc_softc_t *sc = dev_to_sc(dev);
1427     u32 flag;
1428     int entry;
1429     unsigned long flags;
1430 
1431     lmc_trace(dev, "lmc_start_xmit in");
1432 
1433     spin_lock_irqsave(&sc->lmc_lock, flags);
1434 
1435     /* normal path, tbusy known to be zero */
1436 
1437     entry = sc->lmc_next_tx % LMC_TXDESCS;
1438 
1439     sc->lmc_txq[entry] = skb;
1440     sc->lmc_txring[entry].buffer1 = virt_to_bus (skb->data);
1441 
1442     LMC_CONSOLE_LOG("xmit", skb->data, skb->len);
1443 
1444 #ifndef GCOM
1445     /* If the queue is less than half full, don't interrupt */
1446     if (sc->lmc_next_tx - sc->lmc_taint_tx < LMC_TXDESCS / 2)
1447     {
1448         /* Do not interrupt on completion of this packet */
1449         flag = 0x60000000;
1450         netif_wake_queue(dev);
1451     }
1452     else if (sc->lmc_next_tx - sc->lmc_taint_tx == LMC_TXDESCS / 2)
1453     {
1454         /* This generates an interrupt on completion of this packet */
1455         flag = 0xe0000000;
1456         netif_wake_queue(dev);
1457     }
1458     else if (sc->lmc_next_tx - sc->lmc_taint_tx < LMC_TXDESCS - 1)
1459     {
1460         /* Do not interrupt on completion of this packet */
1461         flag = 0x60000000;
1462         netif_wake_queue(dev);
1463     }
1464     else
1465     {
1466         /* This generates an interrupt on completion of this packet */
1467         flag = 0xe0000000;
1468         sc->lmc_txfull = 1;
1469         netif_stop_queue(dev);
1470     }
1471 #else
1472     flag = LMC_TDES_INTERRUPT_ON_COMPLETION;
1473 
1474     if (sc->lmc_next_tx - sc->lmc_taint_tx >= LMC_TXDESCS - 1)
1475     {                           /* ring full, go busy */
1476         sc->lmc_txfull = 1;
1477         netif_stop_queue(dev);
1478         sc->extra_stats.tx_tbusy1++;
1479         LMC_EVENT_LOG(LMC_EVENT_TBUSY1, entry, 0);
1480     }
1481 #endif
1482 
1483 
1484     if (entry == LMC_TXDESCS - 1)       /* last descriptor in ring */
1485         flag |= LMC_TDES_END_OF_RING;   /* flag as such for Tulip */
1486 
1487     /* don't pad small packets either */
1488     flag = sc->lmc_txring[entry].length = (skb->len) | flag |
1489                                                 sc->TxDescriptControlInit;
1490 
1491     /* set the transmit timeout flag to be checked in
1492      * the watchdog timer handler. -baz
1493      */
1494 
1495     sc->extra_stats.tx_NoCompleteCnt++;
1496     sc->lmc_next_tx++;
1497 
1498     /* give ownership to the chip */
1499     LMC_EVENT_LOG(LMC_EVENT_XMT, flag, entry);
1500     sc->lmc_txring[entry].status = 0x80000000;
1501 
1502     /* send now! */
1503     LMC_CSR_WRITE (sc, csr_txpoll, 0);
1504 
1505     spin_unlock_irqrestore(&sc->lmc_lock, flags);
1506 
1507     lmc_trace(dev, "lmc_start_xmit_out");
1508     return NETDEV_TX_OK;
1509 }
1510 
1511 
1512 static int lmc_rx(struct net_device *dev)
1513 {
1514     lmc_softc_t *sc = dev_to_sc(dev);
1515     int i;
1516     int rx_work_limit = LMC_RXDESCS;
1517     unsigned int next_rx;
1518     int rxIntLoopCnt;           /* debug -baz */
1519     int localLengthErrCnt = 0;
1520     long stat;
1521     struct sk_buff *skb, *nsb;
1522     u16 len;
1523 
1524     lmc_trace(dev, "lmc_rx in");
1525 
1526     lmc_led_on(sc, LMC_DS3_LED3);
1527 
1528     rxIntLoopCnt = 0;           /* debug -baz */
1529 
1530     i = sc->lmc_next_rx % LMC_RXDESCS;
1531     next_rx = sc->lmc_next_rx;
1532 
1533     while (((stat = sc->lmc_rxring[i].status) & LMC_RDES_OWN_BIT) != DESC_OWNED_BY_DC21X4)
1534     {
1535         rxIntLoopCnt++;         /* debug -baz */
1536         len = ((stat & LMC_RDES_FRAME_LENGTH) >> RDES_FRAME_LENGTH_BIT_NUMBER);
1537         if ((stat & 0x0300) != 0x0300) {  /* Check first segment and last segment */
1538                 if ((stat & 0x0000ffff) != 0x7fff) {
1539                         /* Oversized frame */
1540                         sc->lmc_device->stats.rx_length_errors++;
1541                         goto skip_packet;
1542                 }
1543         }
1544 
1545         if (stat & 0x00000008) { /* Catch a dribbling bit error */
1546                 sc->lmc_device->stats.rx_errors++;
1547                 sc->lmc_device->stats.rx_frame_errors++;
1548                 goto skip_packet;
1549         }
1550 
1551 
1552         if (stat & 0x00000004) { /* Catch a CRC error by the Xilinx */
1553                 sc->lmc_device->stats.rx_errors++;
1554                 sc->lmc_device->stats.rx_crc_errors++;
1555                 goto skip_packet;
1556         }
1557 
1558         if (len > LMC_PKT_BUF_SZ) {
1559                 sc->lmc_device->stats.rx_length_errors++;
1560                 localLengthErrCnt++;
1561                 goto skip_packet;
1562         }
1563 
1564         if (len < sc->lmc_crcSize + 2) {
1565                 sc->lmc_device->stats.rx_length_errors++;
1566                 sc->extra_stats.rx_SmallPktCnt++;
1567                 localLengthErrCnt++;
1568                 goto skip_packet;
1569         }
1570 
1571         if(stat & 0x00004000){
1572             printk(KERN_WARNING "%s: Receiver descriptor error, receiver out of sync?\n", dev->name);
1573         }
1574 
1575         len -= sc->lmc_crcSize;
1576 
1577         skb = sc->lmc_rxq[i];
1578 
1579         /*
1580          * We ran out of memory at some point
1581          * just allocate an skb buff and continue.
1582          */
1583         
1584         if (!skb) {
1585             nsb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
1586             if (nsb) {
1587                 sc->lmc_rxq[i] = nsb;
1588                 nsb->dev = dev;
1589                 sc->lmc_rxring[i].buffer1 = virt_to_bus(skb_tail_pointer(nsb));
1590             }
1591             sc->failed_recv_alloc = 1;
1592             goto skip_packet;
1593         }
1594         
1595         sc->lmc_device->stats.rx_packets++;
1596         sc->lmc_device->stats.rx_bytes += len;
1597 
1598         LMC_CONSOLE_LOG("recv", skb->data, len);
1599 
1600         /*
1601          * I'm not sure of the sanity of this
1602          * Packets could be arriving at a constant
1603          * 44.210mbits/sec and we're going to copy
1604          * them into a new buffer??
1605          */
1606         
1607         if(len > (LMC_MTU - (LMC_MTU>>2))){ /* len > LMC_MTU * 0.75 */
1608             /*
1609              * If it's a large packet don't copy it just hand it up
1610              */
1611         give_it_anyways:
1612 
1613             sc->lmc_rxq[i] = NULL;
1614             sc->lmc_rxring[i].buffer1 = 0x0;
1615 
1616             skb_put (skb, len);
1617             skb->protocol = lmc_proto_type(sc, skb);
1618             skb_reset_mac_header(skb);
1619             /* skb_reset_network_header(skb); */
1620             skb->dev = dev;
1621             lmc_proto_netif(sc, skb);
1622 
1623             /*
1624              * This skb will be destroyed by the upper layers, make a new one
1625              */
1626             nsb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
1627             if (nsb) {
1628                 sc->lmc_rxq[i] = nsb;
1629                 nsb->dev = dev;
1630                 sc->lmc_rxring[i].buffer1 = virt_to_bus(skb_tail_pointer(nsb));
1631                 /* Transferred to 21140 below */
1632             }
1633             else {
1634                 /*
1635                  * We've run out of memory, stop trying to allocate
1636                  * memory and exit the interrupt handler
1637                  *
1638                  * The chip may run out of receivers and stop
1639                  * in which care we'll try to allocate the buffer
1640                  * again.  (once a second)
1641                  */
1642                 sc->extra_stats.rx_BuffAllocErr++;
1643                 LMC_EVENT_LOG(LMC_EVENT_RCVINT, stat, len);
1644                 sc->failed_recv_alloc = 1;
1645                 goto skip_out_of_mem;
1646             }
1647         }
1648         else {
1649             nsb = dev_alloc_skb(len);
1650             if(!nsb) {
1651                 goto give_it_anyways;
1652             }
1653             skb_copy_from_linear_data(skb, skb_put(nsb, len), len);
1654             
1655             nsb->protocol = lmc_proto_type(sc, nsb);
1656             skb_reset_mac_header(nsb);
1657             /* skb_reset_network_header(nsb); */
1658             nsb->dev = dev;
1659             lmc_proto_netif(sc, nsb);
1660         }
1661 
1662     skip_packet:
1663         LMC_EVENT_LOG(LMC_EVENT_RCVINT, stat, len);
1664         sc->lmc_rxring[i].status = DESC_OWNED_BY_DC21X4;
1665 
1666         sc->lmc_next_rx++;
1667         i = sc->lmc_next_rx % LMC_RXDESCS;
1668         rx_work_limit--;
1669         if (rx_work_limit < 0)
1670             break;
1671     }
1672 
1673     /* detect condition for LMC1000 where DSU cable attaches and fills
1674      * descriptors with bogus packets
1675      *
1676     if (localLengthErrCnt > LMC_RXDESCS - 3) {
1677         sc->extra_stats.rx_BadPktSurgeCnt++;
1678         LMC_EVENT_LOG(LMC_EVENT_BADPKTSURGE, localLengthErrCnt,
1679                       sc->extra_stats.rx_BadPktSurgeCnt);
1680     } */
1681 
1682     /* save max count of receive descriptors serviced */
1683     if (rxIntLoopCnt > sc->extra_stats.rxIntLoopCnt)
1684             sc->extra_stats.rxIntLoopCnt = rxIntLoopCnt; /* debug -baz */
1685 
1686 #ifdef DEBUG
1687     if (rxIntLoopCnt == 0)
1688     {
1689         for (i = 0; i < LMC_RXDESCS; i++)
1690         {
1691             if ((sc->lmc_rxring[i].status & LMC_RDES_OWN_BIT)
1692                 != DESC_OWNED_BY_DC21X4)
1693             {
1694                 rxIntLoopCnt++;
1695             }
1696         }
1697         LMC_EVENT_LOG(LMC_EVENT_RCVEND, rxIntLoopCnt, 0);
1698     }
1699 #endif
1700 
1701 
1702     lmc_led_off(sc, LMC_DS3_LED3);
1703 
1704 skip_out_of_mem:
1705 
1706     lmc_trace(dev, "lmc_rx out");
1707 
1708     return 0;
1709 }
1710 
1711 static struct net_device_stats *lmc_get_stats(struct net_device *dev)
1712 {
1713     lmc_softc_t *sc = dev_to_sc(dev);
1714     unsigned long flags;
1715 
1716     lmc_trace(dev, "lmc_get_stats in");
1717 
1718     spin_lock_irqsave(&sc->lmc_lock, flags);
1719 
1720     sc->lmc_device->stats.rx_missed_errors += LMC_CSR_READ(sc, csr_missed_frames) & 0xffff;
1721 
1722     spin_unlock_irqrestore(&sc->lmc_lock, flags);
1723 
1724     lmc_trace(dev, "lmc_get_stats out");
1725 
1726     return &sc->lmc_device->stats;
1727 }
1728 
1729 static struct pci_driver lmc_driver = {
1730         .name           = "lmc",
1731         .id_table       = lmc_pci_tbl,
1732         .probe          = lmc_init_one,
1733         .remove         = lmc_remove_one,
1734 };
1735 
1736 module_pci_driver(lmc_driver);
1737 
1738 unsigned lmc_mii_readreg (lmc_softc_t * const sc, unsigned devaddr, unsigned regno) /*fold00*/
1739 {
1740     int i;
1741     int command = (0xf6 << 10) | (devaddr << 5) | regno;
1742     int retval = 0;
1743 
1744     lmc_trace(sc->lmc_device, "lmc_mii_readreg in");
1745 
1746     LMC_MII_SYNC (sc);
1747 
1748     lmc_trace(sc->lmc_device, "lmc_mii_readreg: done sync");
1749 
1750     for (i = 15; i >= 0; i--)
1751     {
1752         int dataval = (command & (1 << i)) ? 0x20000 : 0;
1753 
1754         LMC_CSR_WRITE (sc, csr_9, dataval);
1755         lmc_delay ();
1756         /* __SLOW_DOWN_IO; */
1757         LMC_CSR_WRITE (sc, csr_9, dataval | 0x10000);
1758         lmc_delay ();
1759         /* __SLOW_DOWN_IO; */
1760     }
1761 
1762     lmc_trace(sc->lmc_device, "lmc_mii_readreg: done1");
1763 
1764     for (i = 19; i > 0; i--)
1765     {
1766         LMC_CSR_WRITE (sc, csr_9, 0x40000);
1767         lmc_delay ();
1768         /* __SLOW_DOWN_IO; */
1769         retval = (retval << 1) | ((LMC_CSR_READ (sc, csr_9) & 0x80000) ? 1 : 0);
1770         LMC_CSR_WRITE (sc, csr_9, 0x40000 | 0x10000);
1771         lmc_delay ();
1772         /* __SLOW_DOWN_IO; */
1773     }
1774 
1775     lmc_trace(sc->lmc_device, "lmc_mii_readreg out");
1776 
1777     return (retval >> 1) & 0xffff;
1778 }
1779 
1780 void lmc_mii_writereg (lmc_softc_t * const sc, unsigned devaddr, unsigned regno, unsigned data) /*fold00*/
1781 {
1782     int i = 32;
1783     int command = (0x5002 << 16) | (devaddr << 23) | (regno << 18) | data;
1784 
1785     lmc_trace(sc->lmc_device, "lmc_mii_writereg in");
1786 
1787     LMC_MII_SYNC (sc);
1788 
1789     i = 31;
1790     while (i >= 0)
1791     {
1792         int datav;
1793 
1794         if (command & (1 << i))
1795             datav = 0x20000;
1796         else
1797             datav = 0x00000;
1798 
1799         LMC_CSR_WRITE (sc, csr_9, datav);
1800         lmc_delay ();
1801         /* __SLOW_DOWN_IO; */
1802         LMC_CSR_WRITE (sc, csr_9, (datav | 0x10000));
1803         lmc_delay ();
1804         /* __SLOW_DOWN_IO; */
1805         i--;
1806     }
1807 
1808     i = 2;
1809     while (i > 0)
1810     {
1811         LMC_CSR_WRITE (sc, csr_9, 0x40000);
1812         lmc_delay ();
1813         /* __SLOW_DOWN_IO; */
1814         LMC_CSR_WRITE (sc, csr_9, 0x50000);
1815         lmc_delay ();
1816         /* __SLOW_DOWN_IO; */
1817         i--;
1818     }
1819 
1820     lmc_trace(sc->lmc_device, "lmc_mii_writereg out");
1821 }
1822 
1823 static void lmc_softreset (lmc_softc_t * const sc) /*fold00*/
1824 {
1825     int i;
1826 
1827     lmc_trace(sc->lmc_device, "lmc_softreset in");
1828 
1829     /* Initialize the receive rings and buffers. */
1830     sc->lmc_txfull = 0;
1831     sc->lmc_next_rx = 0;
1832     sc->lmc_next_tx = 0;
1833     sc->lmc_taint_rx = 0;
1834     sc->lmc_taint_tx = 0;
1835 
1836     /*
1837      * Setup each one of the receiver buffers
1838      * allocate an skbuff for each one, setup the descriptor table
1839      * and point each buffer at the next one
1840      */
1841 
1842     for (i = 0; i < LMC_RXDESCS; i++)
1843     {
1844         struct sk_buff *skb;
1845 
1846         if (sc->lmc_rxq[i] == NULL)
1847         {
1848             skb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
1849             if(skb == NULL){
1850                 printk(KERN_WARNING "%s: Failed to allocate receiver ring, will try again\n", sc->name);
1851                 sc->failed_ring = 1;
1852                 break;
1853             }
1854             else{
1855                 sc->lmc_rxq[i] = skb;
1856             }
1857         }
1858         else
1859         {
1860             skb = sc->lmc_rxq[i];
1861         }
1862 
1863         skb->dev = sc->lmc_device;
1864 
1865         /* owned by 21140 */
1866         sc->lmc_rxring[i].status = 0x80000000;
1867 
1868         /* used to be PKT_BUF_SZ now uses skb since we lose some to head room */
1869         sc->lmc_rxring[i].length = skb_tailroom(skb);
1870 
1871         /* use to be tail which is dumb since you're thinking why write
1872          * to the end of the packj,et but since there's nothing there tail == data
1873          */
1874         sc->lmc_rxring[i].buffer1 = virt_to_bus (skb->data);
1875 
1876         /* This is fair since the structure is static and we have the next address */
1877         sc->lmc_rxring[i].buffer2 = virt_to_bus (&sc->lmc_rxring[i + 1]);
1878 
1879     }
1880 
1881     /*
1882      * Sets end of ring
1883      */
1884     if (i != 0) {
1885         sc->lmc_rxring[i - 1].length |= 0x02000000; /* Set end of buffers flag */
1886         sc->lmc_rxring[i - 1].buffer2 = virt_to_bus(&sc->lmc_rxring[0]); /* Point back to the start */
1887     }
1888     LMC_CSR_WRITE (sc, csr_rxlist, virt_to_bus (sc->lmc_rxring)); /* write base address */
1889 
1890     /* Initialize the transmit rings and buffers */
1891     for (i = 0; i < LMC_TXDESCS; i++)
1892     {
1893         if (sc->lmc_txq[i] != NULL){            /* have buffer */
1894             dev_kfree_skb(sc->lmc_txq[i]);      /* free it */
1895             sc->lmc_device->stats.tx_dropped++; /* We just dropped a packet */
1896         }
1897         sc->lmc_txq[i] = NULL;
1898         sc->lmc_txring[i].status = 0x00000000;
1899         sc->lmc_txring[i].buffer2 = virt_to_bus (&sc->lmc_txring[i + 1]);
1900     }
1901     sc->lmc_txring[i - 1].buffer2 = virt_to_bus (&sc->lmc_txring[0]);
1902     LMC_CSR_WRITE (sc, csr_txlist, virt_to_bus (sc->lmc_txring));
1903 
1904     lmc_trace(sc->lmc_device, "lmc_softreset out");
1905 }
1906 
1907 void lmc_gpio_mkinput(lmc_softc_t * const sc, u32 bits) /*fold00*/
1908 {
1909     lmc_trace(sc->lmc_device, "lmc_gpio_mkinput in");
1910     sc->lmc_gpio_io &= ~bits;
1911     LMC_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET | (sc->lmc_gpio_io));
1912     lmc_trace(sc->lmc_device, "lmc_gpio_mkinput out");
1913 }
1914 
1915 void lmc_gpio_mkoutput(lmc_softc_t * const sc, u32 bits) /*fold00*/
1916 {
1917     lmc_trace(sc->lmc_device, "lmc_gpio_mkoutput in");
1918     sc->lmc_gpio_io |= bits;
1919     LMC_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET | (sc->lmc_gpio_io));
1920     lmc_trace(sc->lmc_device, "lmc_gpio_mkoutput out");
1921 }
1922 
1923 void lmc_led_on(lmc_softc_t * const sc, u32 led) /*fold00*/
1924 {
1925     lmc_trace(sc->lmc_device, "lmc_led_on in");
1926     if((~sc->lmc_miireg16) & led){ /* Already on! */
1927         lmc_trace(sc->lmc_device, "lmc_led_on aon out");
1928         return;
1929     }
1930     
1931     sc->lmc_miireg16 &= ~led;
1932     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
1933     lmc_trace(sc->lmc_device, "lmc_led_on out");
1934 }
1935 
1936 void lmc_led_off(lmc_softc_t * const sc, u32 led) /*fold00*/
1937 {
1938     lmc_trace(sc->lmc_device, "lmc_led_off in");
1939     if(sc->lmc_miireg16 & led){ /* Already set don't do anything */
1940         lmc_trace(sc->lmc_device, "lmc_led_off aoff out");
1941         return;
1942     }
1943     
1944     sc->lmc_miireg16 |= led;
1945     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
1946     lmc_trace(sc->lmc_device, "lmc_led_off out");
1947 }
1948 
1949 static void lmc_reset(lmc_softc_t * const sc) /*fold00*/
1950 {
1951     lmc_trace(sc->lmc_device, "lmc_reset in");
1952     sc->lmc_miireg16 |= LMC_MII16_FIFO_RESET;
1953     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
1954 
1955     sc->lmc_miireg16 &= ~LMC_MII16_FIFO_RESET;
1956     lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
1957 
1958     /*
1959      * make some of the GPIO pins be outputs
1960      */
1961     lmc_gpio_mkoutput(sc, LMC_GEP_RESET);
1962 
1963     /*
1964      * RESET low to force state reset.  This also forces
1965      * the transmitter clock to be internal, but we expect to reset
1966      * that later anyway.
1967      */
1968     sc->lmc_gpio &= ~(LMC_GEP_RESET);
1969     LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
1970 
1971     /*
1972      * hold for more than 10 microseconds
1973      */
1974     udelay(50);
1975 
1976     /*
1977      * stop driving Xilinx-related signals
1978      */
1979     lmc_gpio_mkinput(sc, LMC_GEP_RESET);
1980 
1981     /*
1982      * Call media specific init routine
1983      */
1984     sc->lmc_media->init(sc);
1985 
1986     sc->extra_stats.resetCount++;
1987     lmc_trace(sc->lmc_device, "lmc_reset out");
1988 }
1989 
1990 static void lmc_dec_reset(lmc_softc_t * const sc) /*fold00*/
1991 {
1992     u32 val;
1993     lmc_trace(sc->lmc_device, "lmc_dec_reset in");
1994 
1995     /*
1996      * disable all interrupts
1997      */
1998     sc->lmc_intrmask = 0;
1999     LMC_CSR_WRITE(sc, csr_intr, sc->lmc_intrmask);
2000 
2001     /*
2002      * Reset the chip with a software reset command.
2003      * Wait 10 microseconds (actually 50 PCI cycles but at
2004      * 33MHz that comes to two microseconds but wait a
2005      * bit longer anyways)
2006      */
2007     LMC_CSR_WRITE(sc, csr_busmode, TULIP_BUSMODE_SWRESET);
2008     udelay(25);
2009 #ifdef __sparc__
2010     sc->lmc_busmode = LMC_CSR_READ(sc, csr_busmode);
2011     sc->lmc_busmode = 0x00100000;
2012     sc->lmc_busmode &= ~TULIP_BUSMODE_SWRESET;
2013     LMC_CSR_WRITE(sc, csr_busmode, sc->lmc_busmode);
2014 #endif
2015     sc->lmc_cmdmode = LMC_CSR_READ(sc, csr_command);
2016 
2017     /*
2018      * We want:
2019      *   no ethernet address in frames we write
2020      *   disable padding (txdesc, padding disable)
2021      *   ignore runt frames (rdes0 bit 15)
2022      *   no receiver watchdog or transmitter jabber timer
2023      *       (csr15 bit 0,14 == 1)
2024      *   if using 16-bit CRC, turn off CRC (trans desc, crc disable)
2025      */
2026 
2027     sc->lmc_cmdmode |= ( TULIP_CMD_PROMISCUOUS
2028                          | TULIP_CMD_FULLDUPLEX
2029                          | TULIP_CMD_PASSBADPKT
2030                          | TULIP_CMD_NOHEARTBEAT
2031                          | TULIP_CMD_PORTSELECT
2032                          | TULIP_CMD_RECEIVEALL
2033                          | TULIP_CMD_MUSTBEONE
2034                        );
2035     sc->lmc_cmdmode &= ~( TULIP_CMD_OPERMODE
2036                           | TULIP_CMD_THRESHOLDCTL
2037                           | TULIP_CMD_STOREFWD
2038                           | TULIP_CMD_TXTHRSHLDCTL
2039                         );
2040 
2041     LMC_CSR_WRITE(sc, csr_command, sc->lmc_cmdmode);
2042 
2043     /*
2044      * disable receiver watchdog and transmit jabber
2045      */
2046     val = LMC_CSR_READ(sc, csr_sia_general);
2047     val |= (TULIP_WATCHDOG_TXDISABLE | TULIP_WATCHDOG_RXDISABLE);
2048     LMC_CSR_WRITE(sc, csr_sia_general, val);
2049 
2050     lmc_trace(sc->lmc_device, "lmc_dec_reset out");
2051 }
2052 
2053 static void lmc_initcsrs(lmc_softc_t * const sc, lmc_csrptr_t csr_base, /*fold00*/
2054                          size_t csr_size)
2055 {
2056     lmc_trace(sc->lmc_device, "lmc_initcsrs in");
2057     sc->lmc_csrs.csr_busmode            = csr_base +  0 * csr_size;
2058     sc->lmc_csrs.csr_txpoll             = csr_base +  1 * csr_size;
2059     sc->lmc_csrs.csr_rxpoll             = csr_base +  2 * csr_size;
2060     sc->lmc_csrs.csr_rxlist             = csr_base +  3 * csr_size;
2061     sc->lmc_csrs.csr_txlist             = csr_base +  4 * csr_size;
2062     sc->lmc_csrs.csr_status             = csr_base +  5 * csr_size;
2063     sc->lmc_csrs.csr_command            = csr_base +  6 * csr_size;
2064     sc->lmc_csrs.csr_intr               = csr_base +  7 * csr_size;
2065     sc->lmc_csrs.csr_missed_frames      = csr_base +  8 * csr_size;
2066     sc->lmc_csrs.csr_9                  = csr_base +  9 * csr_size;
2067     sc->lmc_csrs.csr_10                 = csr_base + 10 * csr_size;
2068     sc->lmc_csrs.csr_11                 = csr_base + 11 * csr_size;
2069     sc->lmc_csrs.csr_12                 = csr_base + 12 * csr_size;
2070     sc->lmc_csrs.csr_13                 = csr_base + 13 * csr_size;
2071     sc->lmc_csrs.csr_14                 = csr_base + 14 * csr_size;
2072     sc->lmc_csrs.csr_15                 = csr_base + 15 * csr_size;
2073     lmc_trace(sc->lmc_device, "lmc_initcsrs out");
2074 }
2075 
2076 static void lmc_driver_timeout(struct net_device *dev)
2077 {
2078     lmc_softc_t *sc = dev_to_sc(dev);
2079     u32 csr6;
2080     unsigned long flags;
2081 
2082     lmc_trace(dev, "lmc_driver_timeout in");
2083 
2084     spin_lock_irqsave(&sc->lmc_lock, flags);
2085 
2086     printk("%s: Xmitter busy|\n", dev->name);
2087 
2088     sc->extra_stats.tx_tbusy_calls++;
2089     if (jiffies - dev_trans_start(dev) < TX_TIMEOUT)
2090             goto bug_out;
2091 
2092     /*
2093      * Chip seems to have locked up
2094      * Reset it
2095      * This whips out all our decriptor
2096      * table and starts from scartch
2097      */
2098 
2099     LMC_EVENT_LOG(LMC_EVENT_XMTPRCTMO,
2100                   LMC_CSR_READ (sc, csr_status),
2101                   sc->extra_stats.tx_ProcTimeout);
2102 
2103     lmc_running_reset (dev);
2104 
2105     LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ (sc, csr_status), 0);
2106     LMC_EVENT_LOG(LMC_EVENT_RESET2,
2107                   lmc_mii_readreg (sc, 0, 16),
2108                   lmc_mii_readreg (sc, 0, 17));
2109 
2110     /* restart the tx processes */
2111     csr6 = LMC_CSR_READ (sc, csr_command);
2112     LMC_CSR_WRITE (sc, csr_command, csr6 | 0x0002);
2113     LMC_CSR_WRITE (sc, csr_command, csr6 | 0x2002);
2114 
2115     /* immediate transmit */
2116     LMC_CSR_WRITE (sc, csr_txpoll, 0);
2117 
2118     sc->lmc_device->stats.tx_errors++;
2119     sc->extra_stats.tx_ProcTimeout++; /* -baz */
2120 
2121     dev->trans_start = jiffies; /* prevent tx timeout */
2122 
2123 bug_out:
2124 
2125     spin_unlock_irqrestore(&sc->lmc_lock, flags);
2126 
2127     lmc_trace(dev, "lmc_driver_timeout out");
2128 
2129 
2130 }
2131 

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