aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/atm/nicstar.c
blob: 14ced85b3f54d9b087a5dab90dea6914cd17da9e (plain) (tree)
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127




































                                                                                















































































































































































                                                                                                 
                                                    
                                                         
























































































































































































































































































































































































































                                                                                                        
                                                                                                    














































                                                                                
                     
                                                
                          




















































































                                                                                          
                                         


















                                                                        
                                       
                                              
                            































                                                                                       
                                       
                                              
                            

























                                                                                       
                                           











































































































































                                                                             
                  
 
                                               
                   


                                            
                  
    
                                                
                                                                             
                        

                      
                  

































































                                                                                   
                                                          
 

                                         

                       


                                       







                                                                             
                              















                                         
                                


















                                         
                                 

                                           
                                                                        
                                                          
                                                                        




                                                          
                                     

                                           
                                                                        
                                                          
                                                                        












                                                          
                                                                        


                                                                               
                                                                          












                                                                               
                                                        





































































































































                                                                                    
                                          
                                                 
                               





















                                                                                    
                                          
                                                 
                               

















































































































































                                                                                  
                         






































































































































































































































































































































































































































































































































































































































                                                                                  
       





                                           
                                           








































































                                                                              
                                                              
                                       
                             






















                                                                      
                                              





                                                                          
                                                    





                                                              
                                   










                                                                              
                                   







                                                                
                                             











                                                                             
                                             









































                                                                             
                                   








                                               
                                 













                                                                                     
                                     








                                                 
                                   


                                           
                                   




                                                                        
                                      







                                                  
                                                                      
                                                
                                    


                                           
                                  
































                                                                        
                                               





                                                              
                                                      





                                                                 
                                                         






















                                                                   
                                                                  


                                           
                                  




                                                                         
                                                                           

                                   
                                     







                                                                             
                                




























                                                     
                                       
                                              
                            


















                                                     
                                       
                                              
                            














                                                     
                                         






                                              
                                                             
                                              
 




                                                                                    


                                                                             
                                                                           

 













                                                               
                                       






                                                         
                                              
                                                     
                                   






                                                         
                                              
                                                     
                                   






                                                            
                                       






                                                         
                                              
                                                     
                                   






                                                         
                                              
                                                     
                                   














































































                                                                               
              

































































































                                                                            
                                                                                    








                                                                 
                                                   
                                                          
                                        









                                                                 
                                                   
                                                          
                                        
























                                                                           
                                                     




























                                                                            
                                                       
























                                                                 
                                                         
                                                                   

 















































































































                                                                        
/******************************************************************************
 *
 * nicstar.c
 *
 * Device driver supporting CBR for IDT 77201/77211 "NICStAR" based cards.
 *
 * IMPORTANT: The included file nicstarmac.c was NOT WRITTEN BY ME.
 *            It was taken from the frle-0.22 device driver.
 *            As the file doesn't have a copyright notice, in the file
 *            nicstarmac.copyright I put the copyright notice from the
 *            frle-0.22 device driver.
 *            Some code is based on the nicstar driver by M. Welsh.
 *
 * Author: Rui Prior (rprior@inescn.pt)
 * PowerPC support by Jay Talbott (jay_talbott@mcg.mot.com) April 1999
 *
 *
 * (C) INESC 1999
 *
 *
 ******************************************************************************/


/**** IMPORTANT INFORMATION ***************************************************
 *
 * There are currently three types of spinlocks:
 *
 * 1 - Per card interrupt spinlock (to protect structures and such)
 * 2 - Per SCQ scq spinlock
 * 3 - Per card resource spinlock (to access registers, etc.)
 *
 * These must NEVER be grabbed in reverse order.
 *
 ******************************************************************************/

/* Header files ***************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/atmdev.h>
#include <linux/atm.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include "nicstar.h"
#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
#include "suni.h"
#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
#ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
#include "idt77105.h"
#endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */

#if BITS_PER_LONG != 32
#  error FIXME: this driver requires a 32-bit platform
#endif

/* Additional code ************************************************************/

#include "nicstarmac.c"


/* Configurable parameters ****************************************************/

#undef PHY_LOOPBACK
#undef TX_DEBUG
#undef RX_DEBUG
#undef GENERAL_DEBUG
#undef EXTRA_DEBUG

#undef NS_USE_DESTRUCTORS /* For now keep this undefined unless you know
                             you're going to use only raw ATM */


/* Do not touch these *********************************************************/

#ifdef TX_DEBUG
#define TXPRINTK(args...) printk(args)
#else
#define TXPRINTK(args...)
#endif /* TX_DEBUG */

#ifdef RX_DEBUG
#define RXPRINTK(args...) printk(args)
#else
#define RXPRINTK(args...)
#endif /* RX_DEBUG */

#ifdef GENERAL_DEBUG
#define PRINTK(args...) printk(args)
#else
#define PRINTK(args...)
#endif /* GENERAL_DEBUG */

#ifdef EXTRA_DEBUG
#define XPRINTK(args...) printk(args)
#else
#define XPRINTK(args...)
#endif /* EXTRA_DEBUG */


/* Macros *********************************************************************/

#define CMD_BUSY(card) (readl((card)->membase + STAT) & NS_STAT_CMDBZ)

#define NS_DELAY mdelay(1)

#define ALIGN_BUS_ADDR(addr, alignment) \
        ((((u32) (addr)) + (((u32) (alignment)) - 1)) & ~(((u32) (alignment)) - 1))
#define ALIGN_ADDRESS(addr, alignment) \
        bus_to_virt(ALIGN_BUS_ADDR(virt_to_bus(addr), alignment))

#undef CEIL

#ifndef ATM_SKB
#define ATM_SKB(s) (&(s)->atm)
#endif

   /* Spinlock debugging stuff */
#ifdef NS_DEBUG_SPINLOCKS /* See nicstar.h */
#define ns_grab_int_lock(card,flags) \
 do { \
    unsigned long nsdsf, nsdsf2; \
    local_irq_save(flags); \
    save_flags(nsdsf); cli();\
    if (nsdsf & (1<<9)) printk ("nicstar.c: ints %sabled -> enabled.\n", \
                                (flags)&(1<<9)?"en":"dis"); \
    if (spin_is_locked(&(card)->int_lock) && \
        (card)->cpu_int == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) int_lock already locked at line %d (cpu %d)\n", \
              __LINE__, smp_processor_id(), (card)->has_int_lock, \
              (card)->cpu_int); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    if (spin_is_locked(&(card)->res_lock) && \
        (card)->cpu_res == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) res_lock locked at line %d (cpu %d)(trying int)\n", \
              __LINE__, smp_processor_id(), (card)->has_res_lock, \
              (card)->cpu_res); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    spin_lock_irq(&(card)->int_lock); \
    (card)->has_int_lock = __LINE__; \
    (card)->cpu_int = smp_processor_id(); \
    restore_flags(nsdsf); } while (0)
#define ns_grab_res_lock(card,flags) \
 do { \
    unsigned long nsdsf, nsdsf2; \
    local_irq_save(flags); \
    save_flags(nsdsf); cli();\
    if (nsdsf & (1<<9)) printk ("nicstar.c: ints %sabled -> enabled.\n", \
                                (flags)&(1<<9)?"en":"dis"); \
    if (spin_is_locked(&(card)->res_lock) && \
        (card)->cpu_res == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) res_lock already locked at line %d (cpu %d)\n", \
              __LINE__, smp_processor_id(), (card)->has_res_lock, \
              (card)->cpu_res); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    spin_lock_irq(&(card)->res_lock); \
    (card)->has_res_lock = __LINE__; \
    (card)->cpu_res = smp_processor_id(); \
    restore_flags(nsdsf); } while (0)
#define ns_grab_scq_lock(card,scq,flags) \
 do { \
    unsigned long nsdsf, nsdsf2; \
    local_irq_save(flags); \
    save_flags(nsdsf); cli();\
    if (nsdsf & (1<<9)) printk ("nicstar.c: ints %sabled -> enabled.\n", \
                                (flags)&(1<<9)?"en":"dis"); \
    if (spin_is_locked(&(scq)->lock) && \
        (scq)->cpu_lock == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) this scq_lock already locked at line %d (cpu %d)\n", \
              __LINE__, smp_processor_id(), (scq)->has_lock, \
              (scq)->cpu_lock); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    if (spin_is_locked(&(card)->res_lock) && \
        (card)->cpu_res == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) res_lock locked at line %d (cpu %d)(trying scq)\n", \
              __LINE__, smp_processor_id(), (card)->has_res_lock, \
              (card)->cpu_res); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    spin_lock_irq(&(scq)->lock); \
    (scq)->has_lock = __LINE__; \
    (scq)->cpu_lock = smp_processor_id(); \
    restore_flags(nsdsf); } while (0)
#else /* !NS_DEBUG_SPINLOCKS */
#define ns_grab_int_lock(card,flags) \
        spin_lock_irqsave(&(card)->int_lock,(flags))
#define ns_grab_res_lock(card,flags) \
        spin_lock_irqsave(&(card)->res_lock,(flags))
#define ns_grab_scq_lock(card,scq,flags) \
        spin_lock_irqsave(&(scq)->lock,flags)
#endif /* NS_DEBUG_SPINLOCKS */


/* Function declarations ******************************************************/

static u32 ns_read_sram(ns_dev *card, u32 sram_address);
static void ns_write_sram(ns_dev *card, u32 sram_address, u32 *value, int count);
static int __devinit ns_init_card(int i, struct pci_dev *pcidev);
static void __devinit ns_init_card_error(ns_dev *card, int error);
static scq_info *get_scq(int size, u32 scd);
static void free_scq(scq_info *scq, struct atm_vcc *vcc);
static void push_rxbufs(ns_dev *, struct sk_buff *);
static irqreturn_t ns_irq_handler(int irq, void *dev_id);
static int ns_open(struct atm_vcc *vcc);
static void ns_close(struct atm_vcc *vcc);
static void fill_tst(ns_dev *card, int n, vc_map *vc);
static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb);
static int push_scqe(ns_dev *card, vc_map *vc, scq_info *scq, ns_scqe *tbd,
                     struct sk_buff *skb);
static void process_tsq(ns_dev *card);
static void drain_scq(ns_dev *card, scq_info *scq, int pos);
static void process_rsq(ns_dev *card);
static void dequeue_rx(ns_dev *card, ns_rsqe *rsqe);
#ifdef NS_USE_DESTRUCTORS
static void ns_sb_destructor(struct sk_buff *sb);
static void ns_lb_destructor(struct sk_buff *lb);
static void ns_hb_destructor(struct sk_buff *hb);
#endif /* NS_USE_DESTRUCTORS */
static void recycle_rx_buf(ns_dev *card, struct sk_buff *skb);
static void recycle_iovec_rx_bufs(ns_dev *card, struct iovec *iov, int count);
static void recycle_iov_buf(ns_dev *card, struct sk_buff *iovb);
static void dequeue_sm_buf(ns_dev *card, struct sk_buff *sb);
static void dequeue_lg_buf(ns_dev *card, struct sk_buff *lb);
static int ns_proc_read(struct atm_dev *dev, loff_t *pos, char *page);
static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user *arg);
static void which_list(ns_dev *card, struct sk_buff *skb);
static void ns_poll(unsigned long arg);
static int ns_parse_mac(char *mac, unsigned char *esi);
static short ns_h2i(char c);
static void ns_phy_put(struct atm_dev *dev, unsigned char value,
                       unsigned long addr);
static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr);



/* Global variables ***********************************************************/

static struct ns_dev *cards[NS_MAX_CARDS];
static unsigned num_cards;
static struct atmdev_ops atm_ops =
{
   .open	= ns_open,
   .close	= ns_close,
   .ioctl	= ns_ioctl,
   .send	= ns_send,
   .phy_put	= ns_phy_put,
   .phy_get	= ns_phy_get,
   .proc_read	= ns_proc_read,
   .owner	= THIS_MODULE,
};
static struct timer_list ns_timer;
static char *mac[NS_MAX_CARDS];
module_param_array(mac, charp, NULL, 0);
MODULE_LICENSE("GPL");


/* Functions*******************************************************************/

static int __devinit nicstar_init_one(struct pci_dev *pcidev,
				      const struct pci_device_id *ent)
{
   static int index = -1;
   unsigned int error;

   index++;
   cards[index] = NULL;

   error = ns_init_card(index, pcidev);
   if (error) {
      cards[index--] = NULL;	/* don't increment index */
      goto err_out;
   }

   return 0;
err_out:
   return -ENODEV;
}



static void __devexit nicstar_remove_one(struct pci_dev *pcidev)
{
   int i, j;
   ns_dev *card = pci_get_drvdata(pcidev);
   struct sk_buff *hb;
   struct sk_buff *iovb;
   struct sk_buff *lb;
   struct sk_buff *sb;
   
   i = card->index;

   if (cards[i] == NULL)
      return;

   if (card->atmdev->phy && card->atmdev->phy->stop)
      card->atmdev->phy->stop(card->atmdev);

   /* Stop everything */
   writel(0x00000000, card->membase + CFG);

   /* De-register device */
   atm_dev_deregister(card->atmdev);

   /* Disable PCI device */
   pci_disable_device(pcidev);
   
   /* Free up resources */
   j = 0;
   PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
   while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
   {
      dev_kfree_skb_any(hb);
      j++;
   }
   PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
   j = 0;
   PRINTK("nicstar%d: freeing %d iovec buffers.\n", i, card->iovpool.count);
   while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
   {
      dev_kfree_skb_any(iovb);
      j++;
   }
   PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
   while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
      dev_kfree_skb_any(lb);
   while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
      dev_kfree_skb_any(sb);
   free_scq(card->scq0, NULL);
   for (j = 0; j < NS_FRSCD_NUM; j++)
   {
      if (card->scd2vc[j] != NULL)
         free_scq(card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
   }
   kfree(card->rsq.org);
   kfree(card->tsq.org);
   free_irq(card->pcidev->irq, card);
   iounmap(card->membase);
   kfree(card);
}



static struct pci_device_id nicstar_pci_tbl[] __devinitdata =
{
	{PCI_VENDOR_ID_IDT, PCI_DEVICE_ID_IDT_IDT77201,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0,}			/* terminate list */
};
MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);



static struct pci_driver nicstar_driver = {
	.name		= "nicstar",
	.id_table	= nicstar_pci_tbl,
	.probe		= nicstar_init_one,
	.remove		= __devexit_p(nicstar_remove_one),
};



static int __init nicstar_init(void)
{
   unsigned error = 0;	/* Initialized to remove compile warning */

   XPRINTK("nicstar: nicstar_init() called.\n");

   error = pci_register_driver(&nicstar_driver);
   
   TXPRINTK("nicstar: TX debug enabled.\n");
   RXPRINTK("nicstar: RX debug enabled.\n");
   PRINTK("nicstar: General debug enabled.\n");
#ifdef PHY_LOOPBACK
   printk("nicstar: using PHY loopback.\n");
#endif /* PHY_LOOPBACK */
   XPRINTK("nicstar: nicstar_init() returned.\n");

   if (!error) {
      init_timer(&ns_timer);
      ns_timer.expires = jiffies + NS_POLL_PERIOD;
      ns_timer.data = 0UL;
      ns_timer.function = ns_poll;
      add_timer(&ns_timer);
   }
   
   return error;
}



static void __exit nicstar_cleanup(void)
{
   XPRINTK("nicstar: nicstar_cleanup() called.\n");

   del_timer(&ns_timer);

   pci_unregister_driver(&nicstar_driver);

   XPRINTK("nicstar: nicstar_cleanup() returned.\n");
}



static u32 ns_read_sram(ns_dev *card, u32 sram_address)
{
   unsigned long flags;
   u32 data;
   sram_address <<= 2;
   sram_address &= 0x0007FFFC;	/* address must be dword aligned */
   sram_address |= 0x50000000;	/* SRAM read command */
   ns_grab_res_lock(card, flags);
   while (CMD_BUSY(card));
   writel(sram_address, card->membase + CMD);
   while (CMD_BUSY(card));
   data = readl(card->membase + DR0);
   spin_unlock_irqrestore(&card->res_lock, flags);
   return data;
}


   
static void ns_write_sram(ns_dev *card, u32 sram_address, u32 *value, int count)
{
   unsigned long flags;
   int i, c;
   count--;	/* count range now is 0..3 instead of 1..4 */
   c = count;
   c <<= 2;	/* to use increments of 4 */
   ns_grab_res_lock(card, flags);
   while (CMD_BUSY(card));
   for (i = 0; i <= c; i += 4)
      writel(*(value++), card->membase + i);
   /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
            so card->membase + DR0 == card->membase */
   sram_address <<= 2;
   sram_address &= 0x0007FFFC;
   sram_address |= (0x40000000 | count);
   writel(sram_address, card->membase + CMD);
   spin_unlock_irqrestore(&card->res_lock, flags);
}


static int __devinit ns_init_card(int i, struct pci_dev *pcidev)
{
   int j;
   struct ns_dev *card = NULL;
   unsigned char pci_latency;
   unsigned error;
   u32 data;
   u32 u32d[4];
   u32 ns_cfg_rctsize;
   int bcount;
   unsigned long membase;

   error = 0;

   if (pci_enable_device(pcidev))
   {
      printk("nicstar%d: can't enable PCI device\n", i);
      error = 2;
      ns_init_card_error(card, error);
      return error;
   }

   if ((card = kmalloc(sizeof(ns_dev), GFP_KERNEL)) == NULL)
   {
      printk("nicstar%d: can't allocate memory for device structure.\n", i);
      error = 2;
      ns_init_card_error(card, error);
      return error;
   }
   cards[i] = card;
   spin_lock_init(&card->int_lock);
   spin_lock_init(&card->res_lock);
      
   pci_set_drvdata(pcidev, card);
   
   card->index = i;
   card->atmdev = NULL;
   card->pcidev = pcidev;
   membase = pci_resource_start(pcidev, 1);
   card->membase = ioremap(membase, NS_IOREMAP_SIZE);
   if (card->membase == 0)
   {
      printk("nicstar%d: can't ioremap() membase.\n",i);
      error = 3;
      ns_init_card_error(card, error);
      return error;
   }
   PRINTK("nicstar%d: membase at 0x%x.\n", i, card->membase);

   pci_set_master(pcidev);

   if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0)
   {
      printk("nicstar%d: can't read PCI latency timer.\n", i);
      error = 6;
      ns_init_card_error(card, error);
      return error;
   }
#ifdef NS_PCI_LATENCY
   if (pci_latency < NS_PCI_LATENCY)
   {
      PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i, NS_PCI_LATENCY);
      for (j = 1; j < 4; j++)
      {
         if (pci_write_config_byte(pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
	    break;
      }
      if (j == 4)
      {
         printk("nicstar%d: can't set PCI latency timer to %d.\n", i, NS_PCI_LATENCY);
         error = 7;
         ns_init_card_error(card, error);
	 return error;
      }
   }
#endif /* NS_PCI_LATENCY */
      
   /* Clear timer overflow */
   data = readl(card->membase + STAT);
   if (data & NS_STAT_TMROF)
      writel(NS_STAT_TMROF, card->membase + STAT);

   /* Software reset */
   writel(NS_CFG_SWRST, card->membase + CFG);
   NS_DELAY;
   writel(0x00000000, card->membase + CFG);

   /* PHY reset */
   writel(0x00000008, card->membase + GP);
   NS_DELAY;
   writel(0x00000001, card->membase + GP);
   NS_DELAY;
   while (CMD_BUSY(card));
   writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD);	/* Sync UTOPIA with SAR clock */
   NS_DELAY;
      
   /* Detect PHY type */
   while (CMD_BUSY(card));
   writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
   while (CMD_BUSY(card));
   data = readl(card->membase + DR0);
   switch(data) {
      case 0x00000009:
         printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
         card->max_pcr = ATM_25_PCR;
         while(CMD_BUSY(card));
         writel(0x00000008, card->membase + DR0);
         writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
         /* Clear an eventual pending interrupt */
         writel(NS_STAT_SFBQF, card->membase + STAT);
#ifdef PHY_LOOPBACK
         while(CMD_BUSY(card));
         writel(0x00000022, card->membase + DR0);
         writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
#endif /* PHY_LOOPBACK */
	 break;
      case 0x00000030:
      case 0x00000031:
         printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
         card->max_pcr = ATM_OC3_PCR;
#ifdef PHY_LOOPBACK
         while(CMD_BUSY(card));
         writel(0x00000002, card->membase + DR0);
         writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
#endif /* PHY_LOOPBACK */
	 break;
      default:
         printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
         error = 8;
         ns_init_card_error(card, error);
         return error;
   }
   writel(0x00000000, card->membase + GP);

   /* Determine SRAM size */
   data = 0x76543210;
   ns_write_sram(card, 0x1C003, &data, 1);
   data = 0x89ABCDEF;
   ns_write_sram(card, 0x14003, &data, 1);
   if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
       ns_read_sram(card, 0x1C003) == 0x76543210)
       card->sram_size = 128;
   else
      card->sram_size = 32;
   PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);

   card->rct_size = NS_MAX_RCTSIZE;

#if (NS_MAX_RCTSIZE == 4096)
   if (card->sram_size == 128)
      printk("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n", i);
#elif (NS_MAX_RCTSIZE == 16384)
   if (card->sram_size == 32)
   {
      printk("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n", i);
      card->rct_size = 4096;
   }
#else
#error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
#endif

   card->vpibits = NS_VPIBITS;
   if (card->rct_size == 4096)
      card->vcibits = 12 - NS_VPIBITS;
   else /* card->rct_size == 16384 */
      card->vcibits = 14 - NS_VPIBITS;

   /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
   if (mac[i] == NULL)
      nicstar_init_eprom(card->membase);

   if (request_irq(pcidev->irq, &ns_irq_handler, IRQF_DISABLED | IRQF_SHARED, "nicstar", card) != 0)
   {
      printk("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
      error = 9;
      ns_init_card_error(card, error);
      return error;
   }

   /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
   writel(0x00000000, card->membase + VPM);
      
   /* Initialize TSQ */
   card->tsq.org = kmalloc(NS_TSQSIZE + NS_TSQ_ALIGNMENT, GFP_KERNEL);
   if (card->tsq.org == NULL)
   {
      printk("nicstar%d: can't allocate TSQ.\n", i);
      error = 10;
      ns_init_card_error(card, error);
      return error;
   }
   card->tsq.base = (ns_tsi *) ALIGN_ADDRESS(card->tsq.org, NS_TSQ_ALIGNMENT);
   card->tsq.next = card->tsq.base;
   card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
   for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
      ns_tsi_init(card->tsq.base + j);
   writel(0x00000000, card->membase + TSQH);
   writel((u32) virt_to_bus(card->tsq.base), card->membase + TSQB);
   PRINTK("nicstar%d: TSQ base at 0x%x  0x%x  0x%x.\n", i, (u32) card->tsq.base,
          (u32) virt_to_bus(card->tsq.base), readl(card->membase + TSQB));
      
   /* Initialize RSQ */
   card->rsq.org = kmalloc(NS_RSQSIZE + NS_RSQ_ALIGNMENT, GFP_KERNEL);
   if (card->rsq.org == NULL)
   {
      printk("nicstar%d: can't allocate RSQ.\n", i);
      error = 11;
      ns_init_card_error(card, error);
      return error;
   }
   card->rsq.base = (ns_rsqe *) ALIGN_ADDRESS(card->rsq.org, NS_RSQ_ALIGNMENT);
   card->rsq.next = card->rsq.base;
   card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
   for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
      ns_rsqe_init(card->rsq.base + j);
   writel(0x00000000, card->membase + RSQH);
   writel((u32) virt_to_bus(card->rsq.base), card->membase + RSQB);
   PRINTK("nicstar%d: RSQ base at 0x%x.\n", i, (u32) card->rsq.base);
      
   /* Initialize SCQ0, the only VBR SCQ used */
   card->scq1 = NULL;
   card->scq2 = NULL;
   card->scq0 = get_scq(VBR_SCQSIZE, NS_VRSCD0);
   if (card->scq0 == NULL)
   {
      printk("nicstar%d: can't get SCQ0.\n", i);
      error = 12;
      ns_init_card_error(card, error);
      return error;
   }
   u32d[0] = (u32) virt_to_bus(card->scq0->base);
   u32d[1] = (u32) 0x00000000;
   u32d[2] = (u32) 0xffffffff;
   u32d[3] = (u32) 0x00000000;
   ns_write_sram(card, NS_VRSCD0, u32d, 4);
   ns_write_sram(card, NS_VRSCD1, u32d, 4);	/* These last two won't be used */
   ns_write_sram(card, NS_VRSCD2, u32d, 4);	/* but are initialized, just in case... */
   card->scq0->scd = NS_VRSCD0;
   PRINTK("nicstar%d: VBR-SCQ0 base at 0x%x.\n", i, (u32) card->scq0->base);

   /* Initialize TSTs */
   card->tst_addr = NS_TST0;
   card->tst_free_entries = NS_TST_NUM_ENTRIES;
   data = NS_TST_OPCODE_VARIABLE;
   for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
      ns_write_sram(card, NS_TST0 + j, &data, 1);
   data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
   ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
   for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
      ns_write_sram(card, NS_TST1 + j, &data, 1);
   data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
   ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
   for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
      card->tste2vc[j] = NULL;
   writel(NS_TST0 << 2, card->membase + TSTB);


   /* Initialize RCT. AAL type is set on opening the VC. */
#ifdef RCQ_SUPPORT
   u32d[0] = NS_RCTE_RAWCELLINTEN;
#else
   u32d[0] = 0x00000000;
#endif /* RCQ_SUPPORT */
   u32d[1] = 0x00000000;
   u32d[2] = 0x00000000;
   u32d[3] = 0xFFFFFFFF;
   for (j = 0; j < card->rct_size; j++)
      ns_write_sram(card, j * 4, u32d, 4);      
      
   memset(card->vcmap, 0, NS_MAX_RCTSIZE * sizeof(vc_map));
      
   for (j = 0; j < NS_FRSCD_NUM; j++)
      card->scd2vc[j] = NULL;

   /* Initialize buffer levels */
   card->sbnr.min = MIN_SB;
   card->sbnr.init = NUM_SB;
   card->sbnr.max = MAX_SB;
   card->lbnr.min = MIN_LB;
   card->lbnr.init = NUM_LB;
   card->lbnr.max = MAX_LB;
   card->iovnr.min = MIN_IOVB;
   card->iovnr.init = NUM_IOVB;
   card->iovnr.max = MAX_IOVB;
   card->hbnr.min = MIN_HB;
   card->hbnr.init = NUM_HB;
   card->hbnr.max = MAX_HB;
   
   card->sm_handle = 0x00000000;
   card->sm_addr = 0x00000000;
   card->lg_handle = 0x00000000;
   card->lg_addr = 0x00000000;
   
   card->efbie = 1;	/* To prevent push_rxbufs from enabling the interrupt */

   /* Pre-allocate some huge buffers */
   skb_queue_head_init(&card->hbpool.queue);
   card->hbpool.count = 0;
   for (j = 0; j < NUM_HB; j++)
   {
      struct sk_buff *hb;
      hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
      if (hb == NULL)
      {
         printk("nicstar%d: can't allocate %dth of %d huge buffers.\n",
                i, j, NUM_HB);
         error = 13;
         ns_init_card_error(card, error);
	 return error;
      }
      NS_SKB_CB(hb)->buf_type = BUF_NONE;
      skb_queue_tail(&card->hbpool.queue, hb);
      card->hbpool.count++;
   }


   /* Allocate large buffers */
   skb_queue_head_init(&card->lbpool.queue);
   card->lbpool.count = 0;			/* Not used */
   for (j = 0; j < NUM_LB; j++)
   {
      struct sk_buff *lb;
      lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
      if (lb == NULL)
      {
         printk("nicstar%d: can't allocate %dth of %d large buffers.\n",
                i, j, NUM_LB);
         error = 14;
         ns_init_card_error(card, error);
	 return error;
      }
      NS_SKB_CB(lb)->buf_type = BUF_LG;
      skb_queue_tail(&card->lbpool.queue, lb);
      skb_reserve(lb, NS_SMBUFSIZE);
      push_rxbufs(card, lb);
      /* Due to the implementation of push_rxbufs() this is 1, not 0 */
      if (j == 1)
      {
         card->rcbuf = lb;
         card->rawch = (u32) virt_to_bus(lb->data);
      }
   }
   /* Test for strange behaviour which leads to crashes */
   if ((bcount = ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min)
   {
      printk("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
             i, j, bcount);
      error = 14;
      ns_init_card_error(card, error);
      return error;
   }
      

   /* Allocate small buffers */
   skb_queue_head_init(&card->sbpool.queue);
   card->sbpool.count = 0;			/* Not used */
   for (j = 0; j < NUM_SB; j++)
   {
      struct sk_buff *sb;
      sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
      if (sb == NULL)
      {
         printk("nicstar%d: can't allocate %dth of %d small buffers.\n",
                i, j, NUM_SB);
         error = 15;
         ns_init_card_error(card, error);
	 return error;
      }
      NS_SKB_CB(sb)->buf_type = BUF_SM;
      skb_queue_tail(&card->sbpool.queue, sb);
      skb_reserve(sb, NS_AAL0_HEADER);
      push_rxbufs(card, sb);
   }
   /* Test for strange behaviour which leads to crashes */
   if ((bcount = ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min)
   {
      printk("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
             i, j, bcount);
      error = 15;
      ns_init_card_error(card, error);
      return error;
   }
      

   /* Allocate iovec buffers */
   skb_queue_head_init(&card->iovpool.queue);
   card->iovpool.count = 0;
   for (j = 0; j < NUM_IOVB; j++)
   {
      struct sk_buff *iovb;
      iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
      if (iovb == NULL)
      {
         printk("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
                i, j, NUM_IOVB);
         error = 16;
         ns_init_card_error(card, error);
	 return error;
      }
      NS_SKB_CB(iovb)->buf_type = BUF_NONE;
      skb_queue_tail(&card->iovpool.queue, iovb);
      card->iovpool.count++;
   }

   card->intcnt = 0;

   /* Configure NICStAR */
   if (card->rct_size == 4096)
      ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
   else /* (card->rct_size == 16384) */
      ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;

   card->efbie = 1;

   /* Register device */
   card->atmdev = atm_dev_register("nicstar", &atm_ops, -1, NULL);
   if (card->atmdev == NULL)
   {
      printk("nicstar%d: can't register device.\n", i);
      error = 17;
      ns_init_card_error(card, error);
      return error;
   }
      
   if (ns_parse_mac(mac[i], card->atmdev->esi)) {
      nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
                         card->atmdev->esi, 6);
      if (memcmp(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00", 6) == 0) {
         nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
                         card->atmdev->esi, 6);
      }
   }

   printk("nicstar%d: MAC address %02X:%02X:%02X:%02X:%02X:%02X\n", i,
          card->atmdev->esi[0], card->atmdev->esi[1], card->atmdev->esi[2],
          card->atmdev->esi[3], card->atmdev->esi[4], card->atmdev->esi[5]);

   card->atmdev->dev_data = card;
   card->atmdev->ci_range.vpi_bits = card->vpibits;
   card->atmdev->ci_range.vci_bits = card->vcibits;
   card->atmdev->link_rate = card->max_pcr;
   card->atmdev->phy = NULL;

#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
   if (card->max_pcr == ATM_OC3_PCR)
      suni_init(card->atmdev);
#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */

#ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
   if (card->max_pcr == ATM_25_PCR)
      idt77105_init(card->atmdev);
#endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */

   if (card->atmdev->phy && card->atmdev->phy->start)
      card->atmdev->phy->start(card->atmdev);

   writel(NS_CFG_RXPATH |
          NS_CFG_SMBUFSIZE |
          NS_CFG_LGBUFSIZE |
          NS_CFG_EFBIE |
          NS_CFG_RSQSIZE |
          NS_CFG_VPIBITS |
          ns_cfg_rctsize |
          NS_CFG_RXINT_NODELAY |
          NS_CFG_RAWIE |		/* Only enabled if RCQ_SUPPORT */
          NS_CFG_RSQAFIE |
          NS_CFG_TXEN |
          NS_CFG_TXIE |
          NS_CFG_TSQFIE_OPT |		/* Only enabled if ENABLE_TSQFIE */ 
          NS_CFG_PHYIE,
          card->membase + CFG);

   num_cards++;

   return error;
}



static void __devinit ns_init_card_error(ns_dev *card, int error)
{
   if (error >= 17)
   {
      writel(0x00000000, card->membase + CFG);
   }
   if (error >= 16)
   {
      struct sk_buff *iovb;
      while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
         dev_kfree_skb_any(iovb);
   }
   if (error >= 15)
   {
      struct sk_buff *sb;
      while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
         dev_kfree_skb_any(sb);
      free_scq(card->scq0, NULL);
   }
   if (error >= 14)
   {
      struct sk_buff *lb;
      while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
         dev_kfree_skb_any(lb);
   }
   if (error >= 13)
   {
      struct sk_buff *hb;
      while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
         dev_kfree_skb_any(hb);
   }
   if (error >= 12)
   {
      kfree(card->rsq.org);
   }
   if (error >= 11)
   {
      kfree(card->tsq.org);
   }
   if (error >= 10)
   {
      free_irq(card->pcidev->irq, card);
   }
   if (error >= 4)
   {
      iounmap(card->membase);
   }
   if (error >= 3)
   {
      pci_disable_device(card->pcidev);
      kfree(card);
   }
}



static scq_info *get_scq(int size, u32 scd)
{
   scq_info *scq;
   int i;

   if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
      return NULL;

   scq = kmalloc(sizeof(scq_info), GFP_KERNEL);
   if (scq == NULL)
      return NULL;
   scq->org = kmalloc(2 * size, GFP_KERNEL);
   if (scq->org == NULL)
   {
      kfree(scq);
      return NULL;
   }
   scq->skb = kmalloc(sizeof(struct sk_buff *) *
                                          (size / NS_SCQE_SIZE), GFP_KERNEL);
   if (scq->skb == NULL)
   {
      kfree(scq->org);
      kfree(scq);
      return NULL;
   }
   scq->num_entries = size / NS_SCQE_SIZE;
   scq->base = (ns_scqe *) ALIGN_ADDRESS(scq->org, size);
   scq->next = scq->base;
   scq->last = scq->base + (scq->num_entries - 1);
   scq->tail = scq->last;
   scq->scd = scd;
   scq->num_entries = size / NS_SCQE_SIZE;
   scq->tbd_count = 0;
   init_waitqueue_head(&scq->scqfull_waitq);
   scq->full = 0;
   spin_lock_init(&scq->lock);

   for (i = 0; i < scq->num_entries; i++)
      scq->skb[i] = NULL;

   return scq;
}



/* For variable rate SCQ vcc must be NULL */
static void free_scq(scq_info *scq, struct atm_vcc *vcc)
{
   int i;

   if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
      for (i = 0; i < scq->num_entries; i++)
      {
         if (scq->skb[i] != NULL)
	 {
            vcc = ATM_SKB(scq->skb[i])->vcc;
            if (vcc->pop != NULL)
	       vcc->pop(vcc, scq->skb[i]);
	    else
               dev_kfree_skb_any(scq->skb[i]);
         }
      }
   else /* vcc must be != NULL */
   {
      if (vcc == NULL)
      {
         printk("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
         for (i = 0; i < scq->num_entries; i++)
            dev_kfree_skb_any(scq->skb[i]);
      }
      else
         for (i = 0; i < scq->num_entries; i++)
         {
            if (scq->skb[i] != NULL)
            {
               if (vcc->pop != NULL)
                  vcc->pop(vcc, scq->skb[i]);
               else
                  dev_kfree_skb_any(scq->skb[i]);
            }
         }
   }
   kfree(scq->skb);
   kfree(scq->org);
   kfree(scq);
}



/* The handles passed must be pointers to the sk_buff containing the small
   or large buffer(s) cast to u32. */
static void push_rxbufs(ns_dev *card, struct sk_buff *skb)
{
   struct ns_skb_cb *cb = NS_SKB_CB(skb);
   u32 handle1, addr1;
   u32 handle2, addr2;
   u32 stat;
   unsigned long flags;
   
   /* *BARF* */
   handle2 = addr2 = 0;
   handle1 = (u32)skb;
   addr1 = (u32)virt_to_bus(skb->data);

#ifdef GENERAL_DEBUG
   if (!addr1)
      printk("nicstar%d: push_rxbufs called with addr1 = 0.\n", card->index);
#endif /* GENERAL_DEBUG */

   stat = readl(card->membase + STAT);
   card->sbfqc = ns_stat_sfbqc_get(stat);
   card->lbfqc = ns_stat_lfbqc_get(stat);
   if (cb->buf_type == BUF_SM)
   {
      if (!addr2)
      {
         if (card->sm_addr)
	 {
	    addr2 = card->sm_addr;
	    handle2 = card->sm_handle;
	    card->sm_addr = 0x00000000;
	    card->sm_handle = 0x00000000;
	 }
	 else /* (!sm_addr) */
	 {
	    card->sm_addr = addr1;
	    card->sm_handle = handle1;
	 }
      }      
   }
   else /* buf_type == BUF_LG */
   {
      if (!addr2)
      {
         if (card->lg_addr)
	 {
	    addr2 = card->lg_addr;
	    handle2 = card->lg_handle;
	    card->lg_addr = 0x00000000;
	    card->lg_handle = 0x00000000;
	 }
	 else /* (!lg_addr) */
	 {
	    card->lg_addr = addr1;
	    card->lg_handle = handle1;
	 }
      }      
   }

   if (addr2)
   {
      if (cb->buf_type == BUF_SM)
      {
         if (card->sbfqc >= card->sbnr.max)
         {
            skb_unlink((struct sk_buff *) handle1, &card->sbpool.queue);
            dev_kfree_skb_any((struct sk_buff *) handle1);
            skb_unlink((struct sk_buff *) handle2, &card->sbpool.queue);
            dev_kfree_skb_any((struct sk_buff *) handle2);
            return;
         }
	 else
            card->sbfqc += 2;
      }
      else /* (buf_type == BUF_LG) */
      {
         if (card->lbfqc >= card->lbnr.max)
         {
            skb_unlink((struct sk_buff *) handle1, &card->lbpool.queue);
            dev_kfree_skb_any((struct sk_buff *) handle1);
            skb_unlink((struct sk_buff *) handle2, &card->lbpool.queue);
            dev_kfree_skb_any((struct sk_buff *) handle2);
            return;
         }
         else
            card->lbfqc += 2;
      }

      ns_grab_res_lock(card, flags);

      while (CMD_BUSY(card));
      writel(addr2, card->membase + DR3);
      writel(handle2, card->membase + DR2);
      writel(addr1, card->membase + DR1);
      writel(handle1, card->membase + DR0);
      writel(NS_CMD_WRITE_FREEBUFQ | cb->buf_type, card->membase + CMD);
 
      spin_unlock_irqrestore(&card->res_lock, flags);

      XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n", card->index,
              (cb->buf_type == BUF_SM ? "small" : "large"), addr1, addr2);
   }

   if (!card->efbie && card->sbfqc >= card->sbnr.min &&
       card->lbfqc >= card->lbnr.min)
   {
      card->efbie = 1;
      writel((readl(card->membase + CFG) | NS_CFG_EFBIE), card->membase + CFG);
   }

   return;
}



static irqreturn_t ns_irq_handler(int irq, void *dev_id)
{
   u32 stat_r;
   ns_dev *card;
   struct atm_dev *dev;
   unsigned long flags;

   card = (ns_dev *) dev_id;
   dev = card->atmdev;
   card->intcnt++;

   PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);

   ns_grab_int_lock(card, flags);
   
   stat_r = readl(card->membase + STAT);

   /* Transmit Status Indicator has been written to T. S. Queue */
   if (stat_r & NS_STAT_TSIF)
   {
      TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
      process_tsq(card);
      writel(NS_STAT_TSIF, card->membase + STAT);
   }
   
   /* Incomplete CS-PDU has been transmitted */
   if (stat_r & NS_STAT_TXICP)
   {
      writel(NS_STAT_TXICP, card->membase + STAT);
      TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
               card->index);
   }
   
   /* Transmit Status Queue 7/8 full */
   if (stat_r & NS_STAT_TSQF)
   {
      writel(NS_STAT_TSQF, card->membase + STAT);
      PRINTK("nicstar%d: TSQ full.\n", card->index);
      process_tsq(card);
   }
   
   /* Timer overflow */
   if (stat_r & NS_STAT_TMROF)
   {
      writel(NS_STAT_TMROF, card->membase + STAT);
      PRINTK("nicstar%d: Timer overflow.\n", card->index);
   }
   
   /* PHY device interrupt signal active */
   if (stat_r & NS_STAT_PHYI)
   {
      writel(NS_STAT_PHYI, card->membase + STAT);
      PRINTK("nicstar%d: PHY interrupt.\n", card->index);
      if (dev->phy && dev->phy->interrupt) {
         dev->phy->interrupt(dev);
      }
   }

   /* Small Buffer Queue is full */
   if (stat_r & NS_STAT_SFBQF)
   {
      writel(NS_STAT_SFBQF, card->membase + STAT);
      printk("nicstar%d: Small free buffer queue is full.\n", card->index);
   }
   
   /* Large Buffer Queue is full */
   if (stat_r & NS_STAT_LFBQF)
   {
      writel(NS_STAT_LFBQF, card->membase + STAT);
      printk("nicstar%d: Large free buffer queue is full.\n", card->index);
   }

   /* Receive Status Queue is full */
   if (stat_r & NS_STAT_RSQF)
   {
      writel(NS_STAT_RSQF, card->membase + STAT);
      printk("nicstar%d: RSQ full.\n", card->index);
      process_rsq(card);
   }

   /* Complete CS-PDU received */
   if (stat_r & NS_STAT_EOPDU)
   {
      RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
      process_rsq(card);
      writel(NS_STAT_EOPDU, card->membase + STAT);
   }

   /* Raw cell received */
   if (stat_r & NS_STAT_RAWCF)
   {
      writel(NS_STAT_RAWCF, card->membase + STAT);
#ifndef RCQ_SUPPORT
      printk("nicstar%d: Raw cell received and no support yet...\n",
             card->index);
#endif /* RCQ_SUPPORT */
      /* NOTE: the following procedure may keep a raw cell pending until the
               next interrupt. As this preliminary support is only meant to
               avoid buffer leakage, this is not an issue. */
      while (readl(card->membase + RAWCT) != card->rawch)
      {
         ns_rcqe *rawcell;

         rawcell = (ns_rcqe *) bus_to_virt(card->rawch);
         if (ns_rcqe_islast(rawcell))
         {
            struct sk_buff *oldbuf;

            oldbuf = card->rcbuf;
            card->rcbuf = (struct sk_buff *) ns_rcqe_nextbufhandle(rawcell);
            card->rawch = (u32) virt_to_bus(card->rcbuf->data);
            recycle_rx_buf(card, oldbuf);
         }
         else
            card->rawch += NS_RCQE_SIZE;
      }
   }

   /* Small buffer queue is empty */
   if (stat_r & NS_STAT_SFBQE)
   {
      int i;
      struct sk_buff *sb;

      writel(NS_STAT_SFBQE, card->membase + STAT);
      printk("nicstar%d: Small free buffer queue empty.\n",
             card->index);
      for (i = 0; i < card->sbnr.min; i++)
      {
         sb = dev_alloc_skb(NS_SMSKBSIZE);
         if (sb == NULL)
         {
            writel(readl(card->membase + CFG) & ~NS_CFG_EFBIE, card->membase + CFG);
            card->efbie = 0;
            break;
         }
         NS_SKB_CB(sb)->buf_type = BUF_SM;
         skb_queue_tail(&card->sbpool.queue, sb);
         skb_reserve(sb, NS_AAL0_HEADER);
         push_rxbufs(card, sb);
      }
      card->sbfqc = i;
      process_rsq(card);
   }

   /* Large buffer queue empty */
   if (stat_r & NS_STAT_LFBQE)
   {
      int i;
      struct sk_buff *lb;

      writel(NS_STAT_LFBQE, card->membase + STAT);
      printk("nicstar%d: Large free buffer queue empty.\n",
             card->index);
      for (i = 0; i < card->lbnr.min; i++)
      {
         lb = dev_alloc_skb(NS_LGSKBSIZE);
         if (lb == NULL)
         {
            writel(readl(card->membase + CFG) & ~NS_CFG_EFBIE, card->membase + CFG);
            card->efbie = 0;
            break;
         }
         NS_SKB_CB(lb)->buf_type = BUF_LG;
         skb_queue_tail(&card->lbpool.queue, lb);
         skb_reserve(lb, NS_SMBUFSIZE);
         push_rxbufs(card, lb);
      }
      card->lbfqc = i;
      process_rsq(card);
   }

   /* Receive Status Queue is 7/8 full */
   if (stat_r & NS_STAT_RSQAF)
   {
      writel(NS_STAT_RSQAF, card->membase + STAT);
      RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
      process_rsq(card);
   }
   
   spin_unlock_irqrestore(&card->int_lock, flags);
   PRINTK("nicstar%d: end of interrupt service\n", card->index);
   return IRQ_HANDLED;
}



static int ns_open(struct atm_vcc *vcc)
{
   ns_dev *card;
   vc_map *vc;
   unsigned long tmpl, modl;
   int tcr, tcra;	/* target cell rate, and absolute value */
   int n = 0;		/* Number of entries in the TST. Initialized to remove
                           the compiler warning. */
   u32 u32d[4];
   int frscdi = 0;	/* Index of the SCD. Initialized to remove the compiler
                           warning. How I wish compilers were clever enough to
			   tell which variables can truly be used
			   uninitialized... */
   int inuse;		/* tx or rx vc already in use by another vcc */
   short vpi = vcc->vpi;
   int vci = vcc->vci;

   card = (ns_dev *) vcc->dev->dev_data;
   PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int) vpi, vci);
   if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0)
   {
      PRINTK("nicstar%d: unsupported AAL.\n", card->index);
      return -EINVAL;
   }

   vc = &(card->vcmap[vpi << card->vcibits | vci]);
   vcc->dev_data = vc;

   inuse = 0;
   if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
      inuse = 1;
   if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
      inuse += 2;
   if (inuse)
   {
      printk("nicstar%d: %s vci already in use.\n", card->index,
             inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
      return -EINVAL;
   }

   set_bit(ATM_VF_ADDR,&vcc->flags);

   /* NOTE: You are not allowed to modify an open connection's QOS. To change
      that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
      needed to do that. */
   if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
   {
      scq_info *scq;
      
      set_bit(ATM_VF_PARTIAL,&vcc->flags);
      if (vcc->qos.txtp.traffic_class == ATM_CBR)
      {
         /* Check requested cell rate and availability of SCD */
         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0 &&
             vcc->qos.txtp.min_pcr == 0)
         {
            PRINTK("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
	           card->index);
	    clear_bit(ATM_VF_PARTIAL,&vcc->flags);
	    clear_bit(ATM_VF_ADDR,&vcc->flags);
            return -EINVAL;
         }

         tcr = atm_pcr_goal(&(vcc->qos.txtp));
         tcra = tcr >= 0 ? tcr : -tcr;
      
         PRINTK("nicstar%d: target cell rate = %d.\n", card->index,
                vcc->qos.txtp.max_pcr);

         tmpl = (unsigned long)tcra * (unsigned long)NS_TST_NUM_ENTRIES;
         modl = tmpl % card->max_pcr;

         n = (int)(tmpl / card->max_pcr);
         if (tcr > 0)
         {
            if (modl > 0) n++;
         }
         else if (tcr == 0)
         {
            if ((n = (card->tst_free_entries - NS_TST_RESERVED)) <= 0)
	    {
               PRINTK("nicstar%d: no CBR bandwidth free.\n", card->index);
	       clear_bit(ATM_VF_PARTIAL,&vcc->flags);
	       clear_bit(ATM_VF_ADDR,&vcc->flags);
               return -EINVAL;
            }
         }

         if (n == 0)
         {
            printk("nicstar%d: selected bandwidth < granularity.\n", card->index);
	    clear_bit(ATM_VF_PARTIAL,&vcc->flags);
	    clear_bit(ATM_VF_ADDR,&vcc->flags);
            return -EINVAL;
         }

         if (n > (card->tst_free_entries - NS_TST_RESERVED))
         {
            PRINTK("nicstar%d: not enough free CBR bandwidth.\n", card->index);
	    clear_bit(ATM_VF_PARTIAL,&vcc->flags);
	    clear_bit(ATM_VF_ADDR,&vcc->flags);
            return -EINVAL;
         }
         else
            card->tst_free_entries -= n;

         XPRINTK("nicstar%d: writing %d tst entries.\n", card->index, n);
         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++)
         {
            if (card->scd2vc[frscdi] == NULL)
            {
               card->scd2vc[frscdi] = vc;
               break;
	    }
         }
         if (frscdi == NS_FRSCD_NUM)
         {
            PRINTK("nicstar%d: no SCD available for CBR channel.\n", card->index);
            card->tst_free_entries += n;
	    clear_bit(ATM_VF_PARTIAL,&vcc->flags);
	    clear_bit(ATM_VF_ADDR,&vcc->flags);
	    return -EBUSY;
         }

         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;

         scq = get_scq(CBR_SCQSIZE, vc->cbr_scd);
         if (scq == NULL)
         {
            PRINTK("nicstar%d: can't get fixed rate SCQ.\n", card->index);
            card->scd2vc[frscdi] = NULL;
            card->tst_free_entries += n;
	    clear_bit(ATM_VF_PARTIAL,&vcc->flags);
	    clear_bit(ATM_VF_ADDR,&vcc->flags);
            return -ENOMEM;
         }
	 vc->scq = scq;
         u32d[0] = (u32) virt_to_bus(scq->base);
         u32d[1] = (u32) 0x00000000;
         u32d[2] = (u32) 0xffffffff;
         u32d[3] = (u32) 0x00000000;
         ns_write_sram(card, vc->cbr_scd, u32d, 4);
         
	 fill_tst(card, n, vc);
      }
      else if (vcc->qos.txtp.traffic_class == ATM_UBR)
      {
         vc->cbr_scd = 0x00000000;
	 vc->scq = card->scq0;
      }
      
      if (vcc->qos.txtp.traffic_class != ATM_NONE)
      {
         vc->tx = 1;
	 vc->tx_vcc = vcc;
	 vc->tbd_count = 0;
      }
      if (vcc->qos.rxtp.traffic_class != ATM_NONE)
      {
         u32 status;
      
         vc->rx = 1;
         vc->rx_vcc = vcc;
         vc->rx_iov = NULL;

	 /* Open the connection in hardware */
	 if (vcc->qos.aal == ATM_AAL5)
	    status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
	 else /* vcc->qos.aal == ATM_AAL0 */
	    status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
#ifdef RCQ_SUPPORT
         status |= NS_RCTE_RAWCELLINTEN;
#endif /* RCQ_SUPPORT */
         ns_write_sram(card, NS_RCT + (vpi << card->vcibits | vci) *
	               NS_RCT_ENTRY_SIZE, &status, 1);
      }
      
   }
   
   set_bit(ATM_VF_READY,&vcc->flags);
   return 0;
}



static void ns_close(struct atm_vcc *vcc)
{
   vc_map *vc;
   ns_dev *card;
   u32 data;
   int i;
   
   vc = vcc->dev_data;
   card = vcc->dev->dev_data;
   PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
          (int) vcc->vpi, vcc->vci);

   clear_bit(ATM_VF_READY,&vcc->flags);
   
   if (vcc->qos.rxtp.traffic_class != ATM_NONE)
   {
      u32 addr;
      unsigned long flags;
      
      addr = NS_RCT + (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
      ns_grab_res_lock(card, flags);
      while(CMD_BUSY(card));
      writel(NS_CMD_CLOSE_CONNECTION | addr << 2, card->membase + CMD);
      spin_unlock_irqrestore(&card->res_lock, flags);
      
      vc->rx = 0;
      if (vc->rx_iov != NULL)
      {
	 struct sk_buff *iovb;
	 u32 stat;
   
         stat = readl(card->membase + STAT);
         card->sbfqc = ns_stat_sfbqc_get(stat);   
         card->lbfqc = ns_stat_lfbqc_get(stat);

         PRINTK("nicstar%d: closing a VC with pending rx buffers.\n",
	        card->index);
         iovb = vc->rx_iov;
         recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
	                       NS_SKB(iovb)->iovcnt);
         NS_SKB(iovb)->iovcnt = 0;
         NS_SKB(iovb)->vcc = NULL;
         ns_grab_int_lock(card, flags);
         recycle_iov_buf(card, iovb);
         spin_unlock_irqrestore(&card->int_lock, flags);
         vc->rx_iov = NULL;
      }
   }

   if (vcc->qos.txtp.traffic_class != ATM_NONE)
   {
      vc->tx = 0;
   }

   if (vcc->qos.txtp.traffic_class == ATM_CBR)
   {
      unsigned long flags;
      ns_scqe *scqep;
      scq_info *scq;

      scq = vc->scq;

      for (;;)
      {
         ns_grab_scq_lock(card, scq, flags);
         scqep = scq->next;
         if (scqep == scq->base)
            scqep = scq->last;
         else
            scqep--;
         if (scqep == scq->tail)
         {
            spin_unlock_irqrestore(&scq->lock, flags);
            break;
         }
         /* If the last entry is not a TSR, place one in the SCQ in order to
            be able to completely drain it and then close. */
         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next)
         {
            ns_scqe tsr;
            u32 scdi, scqi;
            u32 data;
            int index;

            tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
            scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
            scqi = scq->next - scq->base;
            tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
            tsr.word_3 = 0x00000000;
            tsr.word_4 = 0x00000000;
            *scq->next = tsr;
            index = (int) scqi;
            scq->skb[index] = NULL;
            if (scq->next == scq->last)
               scq->next = scq->base;
            else
               scq->next++;
            data = (u32) virt_to_bus(scq->next);
            ns_write_sram(card, scq->scd, &data, 1);
         }
         spin_unlock_irqrestore(&scq->lock, flags);
         schedule();
      }

      /* Free all TST entries */
      data = NS_TST_OPCODE_VARIABLE;
      for (i = 0; i < NS_TST_NUM_ENTRIES; i++)
      {
         if (card->tste2vc[i] == vc)
	 {
            ns_write_sram(card, card->tst_addr + i, &data, 1);
            card->tste2vc[i] = NULL;
            card->tst_free_entries++;
	 }
      }
      
      card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
      free_scq(vc->scq, vcc);
   }

   /* remove all references to vcc before deleting it */
   if (vcc->qos.txtp.traffic_class != ATM_NONE)
   {
     unsigned long flags;
     scq_info *scq = card->scq0;

     ns_grab_scq_lock(card, scq, flags);

     for(i = 0; i < scq->num_entries; i++) {
       if(scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
        ATM_SKB(scq->skb[i])->vcc = NULL;
	atm_return(vcc, scq->skb[i]->truesize);
        PRINTK("nicstar: deleted pending vcc mapping\n");
       }
     }

     spin_unlock_irqrestore(&scq->lock, flags);
   }

   vcc->dev_data = NULL;
   clear_bit(ATM_VF_PARTIAL,&vcc->flags);
   clear_bit(ATM_VF_ADDR,&vcc->flags);

#ifdef RX_DEBUG
   {
      u32 stat, cfg;
      stat = readl(card->membase + STAT);
      cfg = readl(card->membase + CFG);
      printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
      printk("TSQ: base = 0x%08X  next = 0x%08X  last = 0x%08X  TSQT = 0x%08X \n",
             (u32) card->tsq.base, (u32) card->tsq.next,(u32) card->tsq.last,
	     readl(card->membase + TSQT));
      printk("RSQ: base = 0x%08X  next = 0x%08X  last = 0x%08X  RSQT = 0x%08X \n",
             (u32) card->rsq.base, (u32) card->rsq.next,(u32) card->rsq.last,
	     readl(card->membase + RSQT));
      printk("Empty free buffer queue interrupt %s \n",
             card->efbie ? "enabled" : "disabled");
      printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
             ns_stat_sfbqc_get(stat), card->sbpool.count,
	     ns_stat_lfbqc_get(stat), card->lbpool.count);
      printk("hbpool.count = %d  iovpool.count = %d \n",
             card->hbpool.count, card->iovpool.count);
   }
#endif /* RX_DEBUG */
}



static void fill_tst(ns_dev *card, int n, vc_map *vc)
{
   u32 new_tst;
   unsigned long cl;
   int e, r;
   u32 data;
      
   /* It would be very complicated to keep the two TSTs synchronized while
      assuring that writes are only made to the inactive TST. So, for now I
      will use only one TST. If problems occur, I will change this again */
   
   new_tst = card->tst_addr;

   /* Fill procedure */

   for (e = 0; e < NS_TST_NUM_ENTRIES; e++)
   {
      if (card->tste2vc[e] == NULL)
         break;
   }
   if (e == NS_TST_NUM_ENTRIES) {
      printk("nicstar%d: No free TST entries found. \n", card->index);
      return;
   }

   r = n;
   cl = NS_TST_NUM_ENTRIES;
   data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
      
   while (r > 0)
   {
      if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL)
      {
         card->tste2vc[e] = vc;
         ns_write_sram(card, new_tst + e, &data, 1);
         cl -= NS_TST_NUM_ENTRIES;
         r--;
      }

      if (++e == NS_TST_NUM_ENTRIES) {
         e = 0;
      }
      cl += n;
   }
   
   /* End of fill procedure */
   
   data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
   ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
   ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
   card->tst_addr = new_tst;
}



static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
   ns_dev *card;
   vc_map *vc;
   scq_info *scq;
   unsigned long buflen;
   ns_scqe scqe;
   u32 flags;		/* TBD flags, not CPU flags */
   
   card = vcc->dev->dev_data;
   TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
   if ((vc = (vc_map *) vcc->dev_data) == NULL)
   {
      printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n", card->index);
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EINVAL;
   }
   
   if (!vc->tx)
   {
      printk("nicstar%d: Trying to transmit on a non-tx VC.\n", card->index);
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EINVAL;
   }
   
   if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0)
   {
      printk("nicstar%d: Only AAL0 and AAL5 are supported.\n", card->index);
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EINVAL;
   }
   
   if (skb_shinfo(skb)->nr_frags != 0)
   {
      printk("nicstar%d: No scatter-gather yet.\n", card->index);
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EINVAL;
   }
   
   ATM_SKB(skb)->vcc = vcc;

   if (vcc->qos.aal == ATM_AAL5)
   {
      buflen = (skb->len + 47 + 8) / 48 * 48;	/* Multiple of 48 */
      flags = NS_TBD_AAL5;
      scqe.word_2 = cpu_to_le32((u32) virt_to_bus(skb->data));
      scqe.word_3 = cpu_to_le32((u32) skb->len);
      scqe.word_4 = ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
                           ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? 1 : 0);
      flags |= NS_TBD_EOPDU;
   }
   else /* (vcc->qos.aal == ATM_AAL0) */
   {
      buflen = ATM_CELL_PAYLOAD;	/* i.e., 48 bytes */
      flags = NS_TBD_AAL0;
      scqe.word_2 = cpu_to_le32((u32) virt_to_bus(skb->data) + NS_AAL0_HEADER);
      scqe.word_3 = cpu_to_le32(0x00000000);
      if (*skb->data & 0x02)	/* Payload type 1 - end of pdu */
         flags |= NS_TBD_EOPDU;
      scqe.word_4 = cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
      /* Force the VPI/VCI to be the same as in VCC struct */
      scqe.word_4 |= cpu_to_le32((((u32) vcc->vpi) << NS_TBD_VPI_SHIFT |
                                 ((u32) vcc->vci) << NS_TBD_VCI_SHIFT) &
                                 NS_TBD_VC_MASK);
   }

   if (vcc->qos.txtp.traffic_class == ATM_CBR)
   {
      scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
      scq = ((vc_map *) vcc->dev_data)->scq;
   }
   else
   {
      scqe.word_1 = ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
      scq = card->scq0;
   }

   if (push_scqe(card, vc, scq, &scqe, skb) != 0)
   {
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EIO;
   }
   atomic_inc(&vcc->stats->tx);

   return 0;
}



static int push_scqe(ns_dev *card, vc_map *vc, scq_info *scq, ns_scqe *tbd,
                     struct sk_buff *skb)
{
   unsigned long flags;
   ns_scqe tsr;
   u32 scdi, scqi;
   int scq_is_vbr;
   u32 data;
   int index;
   
   ns_grab_scq_lock(card, scq, flags);
   while (scq->tail == scq->next)
   {
      if (in_interrupt()) {
         spin_unlock_irqrestore(&scq->lock, flags);
         printk("nicstar%d: Error pushing TBD.\n", card->index);
         return 1;
      }

      scq->full = 1;
      spin_unlock_irqrestore(&scq->lock, flags);
      interruptible_sleep_on_timeout(&scq->scqfull_waitq, SCQFULL_TIMEOUT);
      ns_grab_scq_lock(card, scq, flags);

      if (scq->full) {
         spin_unlock_irqrestore(&scq->lock, flags);
         printk("nicstar%d: Timeout pushing TBD.\n", card->index);
         return 1;
      }
   }
   *scq->next = *tbd;
   index = (int) (scq->next - scq->base);
   scq->skb[index] = skb;
   XPRINTK("nicstar%d: sending skb at 0x%x (pos %d).\n",
           card->index, (u32) skb, index);
   XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%x.\n",
           card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
           le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
           (u32) scq->next);
   if (scq->next == scq->last)
      scq->next = scq->base;
   else
      scq->next++;

   vc->tbd_count++;
   if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
   {
      scq->tbd_count++;
      scq_is_vbr = 1;
   }
   else
      scq_is_vbr = 0;

   if (vc->tbd_count >= MAX_TBD_PER_VC || scq->tbd_count >= MAX_TBD_PER_SCQ)
   {
      int has_run = 0;

      while (scq->tail == scq->next)
      {
         if (in_interrupt()) {
            data = (u32) virt_to_bus(scq->next);
            ns_write_sram(card, scq->scd, &data, 1);
            spin_unlock_irqrestore(&scq->lock, flags);
            printk("nicstar%d: Error pushing TSR.\n", card->index);
            return 0;
         }

         scq->full = 1;
         if (has_run++) break;
         spin_unlock_irqrestore(&scq->lock, flags);
         interruptible_sleep_on_timeout(&scq->scqfull_waitq, SCQFULL_TIMEOUT);
         ns_grab_scq_lock(card, scq, flags);
      }

      if (!scq->full)
      {
         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
         if (scq_is_vbr)
            scdi = NS_TSR_SCDISVBR;
         else
            scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
         scqi = scq->next - scq->base;
         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
         tsr.word_3 = 0x00000000;
         tsr.word_4 = 0x00000000;

         *scq->next = tsr;
         index = (int) scqi;
         scq->skb[index] = NULL;
         XPRINTK("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%x.\n",
                 card->index, le32_to_cpu(tsr.word_1), le32_to_cpu(tsr.word_2),
                 le32_to_cpu(tsr.word_3), le32_to_cpu(tsr.word_4),
		 (u32) scq->next);
         if (scq->next == scq->last)
            scq->next = scq->base;
         else
            scq->next++;
         vc->tbd_count = 0;
         scq->tbd_count = 0;
      }
      else
         PRINTK("nicstar%d: Timeout pushing TSR.\n", card->index);
   }
   data = (u32) virt_to_bus(scq->next);
   ns_write_sram(card, scq->scd, &data, 1);
   
   spin_unlock_irqrestore(&scq->lock, flags);
   
   return 0;
}



static void process_tsq(ns_dev *card)
{
   u32 scdi;
   scq_info *scq;
   ns_tsi *previous = NULL, *one_ahead, *two_ahead;
   int serviced_entries;   /* flag indicating at least on entry was serviced */
   
   serviced_entries = 0;
   
   if (card->tsq.next == card->tsq.last)
      one_ahead = card->tsq.base;
   else
      one_ahead = card->tsq.next + 1;

   if (one_ahead == card->tsq.last)
      two_ahead = card->tsq.base;
   else
      two_ahead = one_ahead + 1;
   
   while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
          !ns_tsi_isempty(two_ahead))
          /* At most two empty, as stated in the 77201 errata */
   {
      serviced_entries = 1;
    
      /* Skip the one or two possible empty entries */
      while (ns_tsi_isempty(card->tsq.next)) {
         if (card->tsq.next == card->tsq.last)
            card->tsq.next = card->tsq.base;
         else
            card->tsq.next++;
      }
    
      if (!ns_tsi_tmrof(card->tsq.next))
      {
         scdi = ns_tsi_getscdindex(card->tsq.next);
	 if (scdi == NS_TSI_SCDISVBR)
	    scq = card->scq0;
	 else
	 {
	    if (card->scd2vc[scdi] == NULL)
	    {
	       printk("nicstar%d: could not find VC from SCD index.\n",
	              card->index);
               ns_tsi_init(card->tsq.next);
               return;
            }
            scq = card->scd2vc[scdi]->scq;
         }
         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
         scq->full = 0;
         wake_up_interruptible(&(scq->scqfull_waitq));
      }

      ns_tsi_init(card->tsq.next);
      previous = card->tsq.next;
      if (card->tsq.next == card->tsq.last)
         card->tsq.next = card->tsq.base;
      else
         card->tsq.next++;

      if (card->tsq.next == card->tsq.last)
         one_ahead = card->tsq.base;
      else
         one_ahead = card->tsq.next + 1;

      if (one_ahead == card->tsq.last)
         two_ahead = card->tsq.base;
      else
         two_ahead = one_ahead + 1;
   }

   if (serviced_entries) {
      writel((((u32) previous) - ((u32) card->tsq.base)),
             card->membase + TSQH);
   }
}



static void drain_scq(ns_dev *card, scq_info *scq, int pos)
{
   struct atm_vcc *vcc;
   struct sk_buff *skb;
   int i;
   unsigned long flags;
   
   XPRINTK("nicstar%d: drain_scq() called, scq at 0x%x, pos %d.\n",
           card->index, (u32) scq, pos);
   if (pos >= scq->num_entries)
   {
      printk("nicstar%d: Bad index on drain_scq().\n", card->index);
      return;
   }

   ns_grab_scq_lock(card, scq, flags);
   i = (int) (scq->tail - scq->base);
   if (++i == scq->num_entries)
      i = 0;
   while (i != pos)
   {
      skb = scq->skb[i];
      XPRINTK("nicstar%d: freeing skb at 0x%x (index %d).\n",
              card->index, (u32) skb, i);
      if (skb != NULL)
      {
         vcc = ATM_SKB(skb)->vcc;
	 if (vcc && vcc->pop != NULL) {
	    vcc->pop(vcc, skb);
	 } else {
	    dev_kfree_skb_irq(skb);
         }
	 scq->skb[i] = NULL;
      }
      if (++i == scq->num_entries)
         i = 0;
   }
   scq->tail = scq->base + pos;
   spin_unlock_irqrestore(&scq->lock, flags);
}



static void process_rsq(ns_dev *card)
{
   ns_rsqe *previous;

   if (!ns_rsqe_valid(card->rsq.next))
      return;
   do {
      dequeue_rx(card, card->rsq.next);
      ns_rsqe_init(card->rsq.next);
      previous = card->rsq.next;
      if (card->rsq.next == card->rsq.last)
         card->rsq.next = card->rsq.base;
      else
         card->rsq.next++;
   } while (ns_rsqe_valid(card->rsq.next));
   writel((((u32) previous) - ((u32) card->rsq.base)),
          card->membase + RSQH);
}



static void dequeue_rx(ns_dev *card, ns_rsqe *rsqe)
{
   u32 vpi, vci;
   vc_map *vc;
   struct sk_buff *iovb;
   struct iovec *iov;
   struct atm_vcc *vcc;
   struct sk_buff *skb;
   unsigned short aal5_len;
   int len;
   u32 stat;

   stat = readl(card->membase + STAT);
   card->sbfqc = ns_stat_sfbqc_get(stat);   
   card->lbfqc = ns_stat_lfbqc_get(stat);

   skb = (struct sk_buff *) le32_to_cpu(rsqe->buffer_handle);
   vpi = ns_rsqe_vpi(rsqe);
   vci = ns_rsqe_vci(rsqe);
   if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits)
   {
      printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
             card->index, vpi, vci);
      recycle_rx_buf(card, skb);
      return;
   }
   
   vc = &(card->vcmap[vpi << card->vcibits | vci]);
   if (!vc->rx)
   {
      RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
             card->index, vpi, vci);
      recycle_rx_buf(card, skb);
      return;
   }

   vcc = vc->rx_vcc;

   if (vcc->qos.aal == ATM_AAL0)
   {
      struct sk_buff *sb;
      unsigned char *cell;
      int i;

      cell = skb->data;
      for (i = ns_rsqe_cellcount(rsqe); i; i--)
      {
         if ((sb = dev_alloc_skb(NS_SMSKBSIZE)) == NULL)
         {
            printk("nicstar%d: Can't allocate buffers for aal0.\n",
                   card->index);
            atomic_add(i,&vcc->stats->rx_drop);
            break;
         }
         if (!atm_charge(vcc, sb->truesize))
         {
            RXPRINTK("nicstar%d: atm_charge() dropped aal0 packets.\n",
                     card->index);
            atomic_add(i-1,&vcc->stats->rx_drop); /* already increased by 1 */
            dev_kfree_skb_any(sb);
            break;
         }
         /* Rebuild the header */
         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
                               (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
         if (i == 1 && ns_rsqe_eopdu(rsqe))
            *((u32 *) sb->data) |= 0x00000002;
         skb_put(sb, NS_AAL0_HEADER);
         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
         skb_put(sb, ATM_CELL_PAYLOAD);
         ATM_SKB(sb)->vcc = vcc;
	 __net_timestamp(sb);
         vcc->push(vcc, sb);
         atomic_inc(&vcc->stats->rx);
         cell += ATM_CELL_PAYLOAD;
      }

      recycle_rx_buf(card, skb);
      return;
   }

   /* To reach this point, the AAL layer can only be AAL5 */

   if ((iovb = vc->rx_iov) == NULL)
   {
      iovb = skb_dequeue(&(card->iovpool.queue));
      if (iovb == NULL)		/* No buffers in the queue */
      {
         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
	 if (iovb == NULL)
	 {
	    printk("nicstar%d: Out of iovec buffers.\n", card->index);
            atomic_inc(&vcc->stats->rx_drop);
            recycle_rx_buf(card, skb);
            return;
	 }
         NS_SKB_CB(iovb)->buf_type = BUF_NONE;
      }
      else
         if (--card->iovpool.count < card->iovnr.min)
	 {
	    struct sk_buff *new_iovb;
	    if ((new_iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL)
	    {
               NS_SKB_CB(iovb)->buf_type = BUF_NONE;
               skb_queue_tail(&card->iovpool.queue, new_iovb);
               card->iovpool.count++;
	    }
	 }
      vc->rx_iov = iovb;
      NS_SKB(iovb)->iovcnt = 0;
      iovb->len = 0;
      iovb->data = iovb->head;
      skb_reset_tail_pointer(iovb);
      NS_SKB(iovb)->vcc = vcc;
      /* IMPORTANT: a pointer to the sk_buff containing the small or large
                    buffer is stored as iovec base, NOT a pointer to the 
	            small or large buffer itself. */
   }
   else if (NS_SKB(iovb)->iovcnt >= NS_MAX_IOVECS)
   {
      printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
      atomic_inc(&vcc->stats->rx_err);
      recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data, NS_MAX_IOVECS);
      NS_SKB(iovb)->iovcnt = 0;
      iovb->len = 0;
      iovb->data = iovb->head;
      skb_reset_tail_pointer(iovb);
      NS_SKB(iovb)->vcc = vcc;
   }
   iov = &((struct iovec *) iovb->data)[NS_SKB(iovb)->iovcnt++];
   iov->iov_base = (void *) skb;
   iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
   iovb->len += iov->iov_len;

   if (NS_SKB(iovb)->iovcnt == 1)
   {
      if (NS_SKB_CB(skb)->buf_type != BUF_SM)
      {
         printk("nicstar%d: Expected a small buffer, and this is not one.\n",
	        card->index);
         which_list(card, skb);
         atomic_inc(&vcc->stats->rx_err);
         recycle_rx_buf(card, skb);
         vc->rx_iov = NULL;
         recycle_iov_buf(card, iovb);
         return;
      }
   }
   else /* NS_SKB(iovb)->iovcnt >= 2 */
   {
      if (NS_SKB_CB(skb)->buf_type != BUF_LG)
      {
         printk("nicstar%d: Expected a large buffer, and this is not one.\n",
	        card->index);
         which_list(card, skb);
         atomic_inc(&vcc->stats->rx_err);
         recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
	                       NS_SKB(iovb)->iovcnt);
         vc->rx_iov = NULL;
         recycle_iov_buf(card, iovb);
	 return;
      }
   }

   if (ns_rsqe_eopdu(rsqe))
   {
      /* This works correctly regardless of the endianness of the host */
      unsigned char *L1L2 = (unsigned char *)((u32)skb->data +
                                              iov->iov_len - 6);
      aal5_len = L1L2[0] << 8 | L1L2[1];
      len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
      if (ns_rsqe_crcerr(rsqe) ||
          len + 8 > iovb->len || len + (47 + 8) < iovb->len)
      {
         printk("nicstar%d: AAL5 CRC error", card->index);
         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
            printk(" - PDU size mismatch.\n");
         else
            printk(".\n");
         atomic_inc(&vcc->stats->rx_err);
         recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
	   NS_SKB(iovb)->iovcnt);
	 vc->rx_iov = NULL;
         recycle_iov_buf(card, iovb);
	 return;
      }

      /* By this point we (hopefully) have a complete SDU without errors. */

      if (NS_SKB(iovb)->iovcnt == 1)	/* Just a small buffer */
      {
         /* skb points to a small buffer */
         if (!atm_charge(vcc, skb->truesize))
         {
            push_rxbufs(card, skb);
            atomic_inc(&vcc->stats->rx_drop);
         }
         else
	 {
            skb_put(skb, len);
            dequeue_sm_buf(card, skb);
#ifdef NS_USE_DESTRUCTORS
            skb->destructor = ns_sb_destructor;
#endif /* NS_USE_DESTRUCTORS */
            ATM_SKB(skb)->vcc = vcc;
	    __net_timestamp(skb);
            vcc->push(vcc, skb);
            atomic_inc(&vcc->stats->rx);
         }
      }
      else if (NS_SKB(iovb)->iovcnt == 2)	/* One small plus one large buffer */
      {
         struct sk_buff *sb;

         sb = (struct sk_buff *) (iov - 1)->iov_base;
         /* skb points to a large buffer */

         if (len <= NS_SMBUFSIZE)
	 {
            if (!atm_charge(vcc, sb->truesize))
            {
               push_rxbufs(card, sb);
               atomic_inc(&vcc->stats->rx_drop);
            }
            else
	    {
               skb_put(sb, len);
               dequeue_sm_buf(card, sb);
#ifdef NS_USE_DESTRUCTORS
               sb->destructor = ns_sb_destructor;
#endif /* NS_USE_DESTRUCTORS */
               ATM_SKB(sb)->vcc = vcc;
	       __net_timestamp(sb);
               vcc->push(vcc, sb);
               atomic_inc(&vcc->stats->rx);
            }

            push_rxbufs(card, skb);

	 }
	 else			/* len > NS_SMBUFSIZE, the usual case */
	 {
            if (!atm_charge(vcc, skb->truesize))
            {
               push_rxbufs(card, skb);
               atomic_inc(&vcc->stats->rx_drop);
            }
            else
            {
               dequeue_lg_buf(card, skb);
#ifdef NS_USE_DESTRUCTORS
               skb->destructor = ns_lb_destructor;
#endif /* NS_USE_DESTRUCTORS */
               skb_push(skb, NS_SMBUFSIZE);
               skb_copy_from_linear_data(sb, skb->data, NS_SMBUFSIZE);
               skb_put(skb, len - NS_SMBUFSIZE);
               ATM_SKB(skb)->vcc = vcc;
	       __net_timestamp(skb);
               vcc->push(vcc, skb);
               atomic_inc(&vcc->stats->rx);
            }

            push_rxbufs(card, sb);

         }
	 
      }
      else				/* Must push a huge buffer */
      {
         struct sk_buff *hb, *sb, *lb;
	 int remaining, tocopy;
         int j;

         hb = skb_dequeue(&(card->hbpool.queue));
         if (hb == NULL)		/* No buffers in the queue */
         {

            hb = dev_alloc_skb(NS_HBUFSIZE);
            if (hb == NULL)
            {
               printk("nicstar%d: Out of huge buffers.\n", card->index);
               atomic_inc(&vcc->stats->rx_drop);
               recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
	                             NS_SKB(iovb)->iovcnt);
               vc->rx_iov = NULL;
               recycle_iov_buf(card, iovb);
               return;
            }
            else if (card->hbpool.count < card->hbnr.min)
	    {
               struct sk_buff *new_hb;
               if ((new_hb = dev_alloc_skb(NS_HBUFSIZE)) != NULL)
               {
                  skb_queue_tail(&card->hbpool.queue, new_hb);
                  card->hbpool.count++;
               }
            }
            NS_SKB_CB(hb)->buf_type = BUF_NONE;
	 }
	 else
         if (--card->hbpool.count < card->hbnr.min)
         {
            struct sk_buff *new_hb;
            if ((new_hb = dev_alloc_skb(NS_HBUFSIZE)) != NULL)
            {
               NS_SKB_CB(new_hb)->buf_type = BUF_NONE;
               skb_queue_tail(&card->hbpool.queue, new_hb);
               card->hbpool.count++;
            }
            if (card->hbpool.count < card->hbnr.min)
	    {
               if ((new_hb = dev_alloc_skb(NS_HBUFSIZE)) != NULL)
               {
                  NS_SKB_CB(new_hb)->buf_type = BUF_NONE;
                  skb_queue_tail(&card->hbpool.queue, new_hb);
                  card->hbpool.count++;
               }
            }
         }

         iov = (struct iovec *) iovb->data;

         if (!atm_charge(vcc, hb->truesize))
	 {
            recycle_iovec_rx_bufs(card, iov, NS_SKB(iovb)->iovcnt);
            if (card->hbpool.count < card->hbnr.max)
            {
               skb_queue_tail(&card->hbpool.queue, hb);
               card->hbpool.count++;
            }
	    else
	       dev_kfree_skb_any(hb);
	    atomic_inc(&vcc->stats->rx_drop);
         }
         else
	 {
            /* Copy the small buffer to the huge buffer */
            sb = (struct sk_buff *) iov->iov_base;
            skb_copy_from_linear_data(sb, hb->data, iov->iov_len);
            skb_put(hb, iov->iov_len);
            remaining = len - iov->iov_len;
            iov++;
            /* Free the small buffer */
            push_rxbufs(card, sb);

            /* Copy all large buffers to the huge buffer and free them */
            for (j = 1; j < NS_SKB(iovb)->iovcnt; j++)
            {
               lb = (struct sk_buff *) iov->iov_base;
               tocopy = min_t(int, remaining, iov->iov_len);
               skb_copy_from_linear_data(lb, skb_tail_pointer(hb), tocopy);
               skb_put(hb, tocopy);
               iov++;
               remaining -= tocopy;
               push_rxbufs(card, lb);
            }
#ifdef EXTRA_DEBUG
            if (remaining != 0 || hb->len != len)
               printk("nicstar%d: Huge buffer len mismatch.\n", card->index);
#endif /* EXTRA_DEBUG */
            ATM_SKB(hb)->vcc = vcc;
#ifdef NS_USE_DESTRUCTORS
            hb->destructor = ns_hb_destructor;
#endif /* NS_USE_DESTRUCTORS */
	    __net_timestamp(hb);
            vcc->push(vcc, hb);
            atomic_inc(&vcc->stats->rx);
         }
      }

      vc->rx_iov = NULL;
      recycle_iov_buf(card, iovb);
   }

}



#ifdef NS_USE_DESTRUCTORS

static void ns_sb_destructor(struct sk_buff *sb)
{
   ns_dev *card;
   u32 stat;

   card = (ns_dev *) ATM_SKB(sb)->vcc->dev->dev_data;
   stat = readl(card->membase + STAT);
   card->sbfqc = ns_stat_sfbqc_get(stat);   
   card->lbfqc = ns_stat_lfbqc_get(stat);

   do
   {
      sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
      if (sb == NULL)
         break;
      NS_SKB_CB(sb)->buf_type = BUF_SM;
      skb_queue_tail(&card->sbpool.queue, sb);
      skb_reserve(sb, NS_AAL0_HEADER);
      push_rxbufs(card, sb);
   } while (card->sbfqc < card->sbnr.min);
}



static void ns_lb_destructor(struct sk_buff *lb)
{
   ns_dev *card;
   u32 stat;

   card = (ns_dev *) ATM_SKB(lb)->vcc->dev->dev_data;
   stat = readl(card->membase + STAT);
   card->sbfqc = ns_stat_sfbqc_get(stat);   
   card->lbfqc = ns_stat_lfbqc_get(stat);

   do
   {
      lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
      if (lb == NULL)
         break;
      NS_SKB_CB(lb)->buf_type = BUF_LG;
      skb_queue_tail(&card->lbpool.queue, lb);
      skb_reserve(lb, NS_SMBUFSIZE);
      push_rxbufs(card, lb);
   } while (card->lbfqc < card->lbnr.min);
}



static void ns_hb_destructor(struct sk_buff *hb)
{
   ns_dev *card;

   card = (ns_dev *) ATM_SKB(hb)->vcc->dev->dev_data;

   while (card->hbpool.count < card->hbnr.init)
   {
      hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
      if (hb == NULL)
         break;
      NS_SKB_CB(hb)->buf_type = BUF_NONE;
      skb_queue_tail(&card->hbpool.queue, hb);
      card->hbpool.count++;
   }
}

#endif /* NS_USE_DESTRUCTORS */


static void recycle_rx_buf(ns_dev *card, struct sk_buff *skb)
{
	struct ns_skb_cb *cb = NS_SKB_CB(skb);

	if (unlikely(cb->buf_type == BUF_NONE)) {
		printk("nicstar%d: What kind of rx buffer is this?\n", card->index);
		dev_kfree_skb_any(skb);
	} else
		push_rxbufs(card, skb);
}


static void recycle_iovec_rx_bufs(ns_dev *card, struct iovec *iov, int count)
{
	while (count-- > 0)
		recycle_rx_buf(card, (struct sk_buff *) (iov++)->iov_base);
}


static void recycle_iov_buf(ns_dev *card, struct sk_buff *iovb)
{
   if (card->iovpool.count < card->iovnr.max)
   {
      skb_queue_tail(&card->iovpool.queue, iovb);
      card->iovpool.count++;
   }
   else
      dev_kfree_skb_any(iovb);
}



static void dequeue_sm_buf(ns_dev *card, struct sk_buff *sb)
{
   skb_unlink(sb, &card->sbpool.queue);
#ifdef NS_USE_DESTRUCTORS
   if (card->sbfqc < card->sbnr.min)
#else
   if (card->sbfqc < card->sbnr.init)
   {
      struct sk_buff *new_sb;
      if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL)
      {
         NS_SKB_CB(new_sb)->buf_type = BUF_SM;
         skb_queue_tail(&card->sbpool.queue, new_sb);
         skb_reserve(new_sb, NS_AAL0_HEADER);
         push_rxbufs(card, new_sb);
      }
   }
   if (card->sbfqc < card->sbnr.init)
#endif /* NS_USE_DESTRUCTORS */
   {
      struct sk_buff *new_sb;
      if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL)
      {
         NS_SKB_CB(new_sb)->buf_type = BUF_SM;
         skb_queue_tail(&card->sbpool.queue, new_sb);
         skb_reserve(new_sb, NS_AAL0_HEADER);
         push_rxbufs(card, new_sb);
      }
   }
}



static void dequeue_lg_buf(ns_dev *card, struct sk_buff *lb)
{
   skb_unlink(lb, &card->lbpool.queue);
#ifdef NS_USE_DESTRUCTORS
   if (card->lbfqc < card->lbnr.min)
#else
   if (card->lbfqc < card->lbnr.init)
   {
      struct sk_buff *new_lb;
      if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL)
      {
         NS_SKB_CB(new_lb)->buf_type = BUF_LG;
         skb_queue_tail(&card->lbpool.queue, new_lb);
         skb_reserve(new_lb, NS_SMBUFSIZE);
         push_rxbufs(card, new_lb);
      }
   }
   if (card->lbfqc < card->lbnr.init)
#endif /* NS_USE_DESTRUCTORS */
   {
      struct sk_buff *new_lb;
      if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL)
      {
         NS_SKB_CB(new_lb)->buf_type = BUF_LG;
         skb_queue_tail(&card->lbpool.queue, new_lb);
         skb_reserve(new_lb, NS_SMBUFSIZE);
         push_rxbufs(card, new_lb);
      }
   }
}



static int ns_proc_read(struct atm_dev *dev, loff_t *pos, char *page)
{
   u32 stat;
   ns_dev *card;
   int left;

   left = (int) *pos;
   card = (ns_dev *) dev->dev_data;
   stat = readl(card->membase + STAT);
   if (!left--)
      return sprintf(page, "Pool   count    min   init    max \n");
   if (!left--)
      return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
                     ns_stat_sfbqc_get(stat), card->sbnr.min, card->sbnr.init,
		     card->sbnr.max);
   if (!left--)
      return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
                     ns_stat_lfbqc_get(stat), card->lbnr.min, card->lbnr.init,
		     card->lbnr.max);
   if (!left--)
      return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n", card->hbpool.count,
                     card->hbnr.min, card->hbnr.init, card->hbnr.max);
   if (!left--)
      return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n", card->iovpool.count,
                     card->iovnr.min, card->iovnr.init, card->iovnr.max);
   if (!left--)
   {
      int retval;
      retval = sprintf(page, "Interrupt counter: %u \n", card->intcnt);
      card->intcnt = 0;
      return retval;
   }
#if 0
   /* Dump 25.6 Mbps PHY registers */
   /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
      here just in case it's needed for debugging. */
   if (card->max_pcr == ATM_25_PCR && !left--)
   {
      u32 phy_regs[4];
      u32 i;

      for (i = 0; i < 4; i++)
      {
         while (CMD_BUSY(card));
         writel(NS_CMD_READ_UTILITY | 0x00000200 | i, card->membase + CMD);
         while (CMD_BUSY(card));
         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
      }

      return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
                     phy_regs[0], phy_regs[1], phy_regs[2], phy_regs[3]);
   }
#endif /* 0 - Dump 25.6 Mbps PHY registers */
#if 0
   /* Dump TST */
   if (left-- < NS_TST_NUM_ENTRIES)
   {
      if (card->tste2vc[left + 1] == NULL)
         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
      else
         return sprintf(page, "%5d - %d %d \n", left + 1,
                        card->tste2vc[left + 1]->tx_vcc->vpi,
                        card->tste2vc[left + 1]->tx_vcc->vci);
   }
#endif /* 0 */
   return 0;
}



static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user *arg)
{
   ns_dev *card;
   pool_levels pl;
   long btype;
   unsigned long flags;

   card = dev->dev_data;
   switch (cmd)
   {
      case NS_GETPSTAT:
         if (get_user(pl.buftype, &((pool_levels __user *) arg)->buftype))
	    return -EFAULT;
         switch (pl.buftype)
	 {
	    case NS_BUFTYPE_SMALL:
	       pl.count = ns_stat_sfbqc_get(readl(card->membase + STAT));
	       pl.level.min = card->sbnr.min;
	       pl.level.init = card->sbnr.init;
	       pl.level.max = card->sbnr.max;
	       break;

	    case NS_BUFTYPE_LARGE:
	       pl.count = ns_stat_lfbqc_get(readl(card->membase + STAT));
	       pl.level.min = card->lbnr.min;
	       pl.level.init = card->lbnr.init;
	       pl.level.max = card->lbnr.max;
	       break;

	    case NS_BUFTYPE_HUGE:
	       pl.count = card->hbpool.count;
	       pl.level.min = card->hbnr.min;
	       pl.level.init = card->hbnr.init;
	       pl.level.max = card->hbnr.max;
	       break;

	    case NS_BUFTYPE_IOVEC:
	       pl.count = card->iovpool.count;
	       pl.level.min = card->iovnr.min;
	       pl.level.init = card->iovnr.init;
	       pl.level.max = card->iovnr.max;
	       break;

            default:
	       return -ENOIOCTLCMD;

	 }
         if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
	    return (sizeof(pl));
	 else
	    return -EFAULT;

      case NS_SETBUFLEV:
         if (!capable(CAP_NET_ADMIN))
	    return -EPERM;
         if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
	    return -EFAULT;
	 if (pl.level.min >= pl.level.init || pl.level.init >= pl.level.max)
	    return -EINVAL;
	 if (pl.level.min == 0)
	    return -EINVAL;
         switch (pl.buftype)
	 {
	    case NS_BUFTYPE_SMALL:
               if (pl.level.max > TOP_SB)
	          return -EINVAL;
	       card->sbnr.min = pl.level.min;
	       card->sbnr.init = pl.level.init;
	       card->sbnr.max = pl.level.max;
	       break;

	    case NS_BUFTYPE_LARGE:
               if (pl.level.max > TOP_LB)
	          return -EINVAL;
	       card->lbnr.min = pl.level.min;
	       card->lbnr.init = pl.level.init;
	       card->lbnr.max = pl.level.max;
	       break;

	    case NS_BUFTYPE_HUGE:
               if (pl.level.max > TOP_HB)
	          return -EINVAL;
	       card->hbnr.min = pl.level.min;
	       card->hbnr.init = pl.level.init;
	       card->hbnr.max = pl.level.max;
	       break;

	    case NS_BUFTYPE_IOVEC:
               if (pl.level.max > TOP_IOVB)
	          return -EINVAL;
	       card->iovnr.min = pl.level.min;
	       card->iovnr.init = pl.level.init;
	       card->iovnr.max = pl.level.max;
	       break;

            default:
	       return -EINVAL;

         }	 
         return 0;

      case NS_ADJBUFLEV:
         if (!capable(CAP_NET_ADMIN))
	    return -EPERM;
         btype = (long) arg;	/* a long is the same size as a pointer or bigger */
         switch (btype)
	 {
	    case NS_BUFTYPE_SMALL:
	       while (card->sbfqc < card->sbnr.init)
	       {
                  struct sk_buff *sb;

                  sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
                  if (sb == NULL)
                     return -ENOMEM;
                  NS_SKB_CB(sb)->buf_type = BUF_SM;
                  skb_queue_tail(&card->sbpool.queue, sb);
                  skb_reserve(sb, NS_AAL0_HEADER);
                  push_rxbufs(card, sb);
	       }
	       break;

            case NS_BUFTYPE_LARGE:
	       while (card->lbfqc < card->lbnr.init)
	       {
                  struct sk_buff *lb;

                  lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
                  if (lb == NULL)
                     return -ENOMEM;
                  NS_SKB_CB(lb)->buf_type = BUF_LG;
                  skb_queue_tail(&card->lbpool.queue, lb);
                  skb_reserve(lb, NS_SMBUFSIZE);
                  push_rxbufs(card, lb);
	       }
	       break;

            case NS_BUFTYPE_HUGE:
               while (card->hbpool.count > card->hbnr.init)
	       {
                  struct sk_buff *hb;

                  ns_grab_int_lock(card, flags);
		  hb = skb_dequeue(&card->hbpool.queue);
		  card->hbpool.count--;
                  spin_unlock_irqrestore(&card->int_lock, flags);
                  if (hb == NULL)
		     printk("nicstar%d: huge buffer count inconsistent.\n",
		            card->index);
                  else
		     dev_kfree_skb_any(hb);
		  
	       }
               while (card->hbpool.count < card->hbnr.init)
               {
                  struct sk_buff *hb;

                  hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
                  if (hb == NULL)
                     return -ENOMEM;
                  NS_SKB_CB(hb)->buf_type = BUF_NONE;
                  ns_grab_int_lock(card, flags);
                  skb_queue_tail(&card->hbpool.queue, hb);
                  card->hbpool.count++;
                  spin_unlock_irqrestore(&card->int_lock, flags);
               }
	       break;

            case NS_BUFTYPE_IOVEC:
	       while (card->iovpool.count > card->iovnr.init)
	       {
	          struct sk_buff *iovb;

                  ns_grab_int_lock(card, flags);
		  iovb = skb_dequeue(&card->iovpool.queue);
		  card->iovpool.count--;
                  spin_unlock_irqrestore(&card->int_lock, flags);
                  if (iovb == NULL)
		     printk("nicstar%d: iovec buffer count inconsistent.\n",
		            card->index);
                  else
		     dev_kfree_skb_any(iovb);

	       }
               while (card->iovpool.count < card->iovnr.init)
	       {
	          struct sk_buff *iovb;

                  iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
                  if (iovb == NULL)
                     return -ENOMEM;
                  NS_SKB_CB(iovb)->buf_type = BUF_NONE;
                  ns_grab_int_lock(card, flags);
                  skb_queue_tail(&card->iovpool.queue, iovb);
                  card->iovpool.count++;
                  spin_unlock_irqrestore(&card->int_lock, flags);
	       }
	       break;

            default:
	       return -EINVAL;

	 }
         return 0;

      default:
         if (dev->phy && dev->phy->ioctl) {
            return dev->phy->ioctl(dev, cmd, arg);
         }
         else {
            printk("nicstar%d: %s == NULL \n", card->index,
                   dev->phy ? "dev->phy->ioctl" : "dev->phy");
            return -ENOIOCTLCMD;
         }
   }
}


static void which_list(ns_dev *card, struct sk_buff *skb)
{
	printk("skb buf_type: 0x%08x\n", NS_SKB_CB(skb)->buf_type);
}


static void ns_poll(unsigned long arg)
{
   int i;
   ns_dev *card;
   unsigned long flags;
   u32 stat_r, stat_w;

   PRINTK("nicstar: Entering ns_poll().\n");
   for (i = 0; i < num_cards; i++)
   {
      card = cards[i];
      if (spin_is_locked(&card->int_lock)) {
      /* Probably it isn't worth spinning */
         continue;
      }
      ns_grab_int_lock(card, flags);

      stat_w = 0;
      stat_r = readl(card->membase + STAT);
      if (stat_r & NS_STAT_TSIF)
         stat_w |= NS_STAT_TSIF;
      if (stat_r & NS_STAT_EOPDU)
         stat_w |= NS_STAT_EOPDU;

      process_tsq(card);
      process_rsq(card);

      writel(stat_w, card->membase + STAT);
      spin_unlock_irqrestore(&card->int_lock, flags);
   }
   mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
   PRINTK("nicstar: Leaving ns_poll().\n");
}



static int ns_parse_mac(char *mac, unsigned char *esi)
{
   int i, j;
   short byte1, byte0;

   if (mac == NULL || esi == NULL)
      return -1;
   j = 0;
   for (i = 0; i < 6; i++)
   {
      if ((byte1 = ns_h2i(mac[j++])) < 0)
         return -1;
      if ((byte0 = ns_h2i(mac[j++])) < 0)
         return -1;
      esi[i] = (unsigned char) (byte1 * 16 + byte0);
      if (i < 5)
      {
         if (mac[j++] != ':')
            return -1;
      }
   }
   return 0;
}



static short ns_h2i(char c)
{
   if (c >= '0' && c <= '9')
      return (short) (c - '0');
   if (c >= 'A' && c <= 'F')
      return (short) (c - 'A' + 10);
   if (c >= 'a' && c <= 'f')
      return (short) (c - 'a' + 10);
   return -1;
}



static void ns_phy_put(struct atm_dev *dev, unsigned char value,
                    unsigned long addr)
{
   ns_dev *card;
   unsigned long flags;

   card = dev->dev_data;
   ns_grab_res_lock(card, flags);
   while(CMD_BUSY(card));
   writel((unsigned long) value, card->membase + DR0);
   writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
          card->membase + CMD);
   spin_unlock_irqrestore(&card->res_lock, flags);
}



static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
{
   ns_dev *card;
   unsigned long flags;
   unsigned long data;

   card = dev->dev_data;
   ns_grab_res_lock(card, flags);
   while(CMD_BUSY(card));
   writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
          card->membase + CMD);
   while(CMD_BUSY(card));
   data = readl(card->membase + DR0) & 0x000000FF;
   spin_unlock_irqrestore(&card->res_lock, flags);
   return (unsigned char) data;
}



module_init(nicstar_init);
module_exit(nicstar_cleanup);