summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/sis/sis900.c
blob: efca14eaefa9324487e3a0aa496730145920795d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
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
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
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
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
/* sis900.c: A SiS 900/7016 PCI Fast Ethernet driver for Linux.
   Copyright 1999 Silicon Integrated System Corporation
   Revision:	1.08.10 Apr. 2 2006

   Modified from the driver which is originally written by Donald Becker.

   This software may be used and distributed according to the terms
   of the GNU General Public License (GPL), incorporated herein by reference.
   Drivers based on this skeleton fall under the GPL and must retain
   the authorship (implicit copyright) notice.

   References:
   SiS 7016 Fast Ethernet PCI Bus 10/100 Mbps LAN Controller with OnNow Support,
   preliminary Rev. 1.0 Jan. 14, 1998
   SiS 900 Fast Ethernet PCI Bus 10/100 Mbps LAN Single Chip with OnNow Support,
   preliminary Rev. 1.0 Nov. 10, 1998
   SiS 7014 Single Chip 100BASE-TX/10BASE-T Physical Layer Solution,
   preliminary Rev. 1.0 Jan. 18, 1998

   Rev 1.08.10 Apr.  2 2006 Daniele Venzano add vlan (jumbo packets) support
   Rev 1.08.09 Sep. 19 2005 Daniele Venzano add Wake on LAN support
   Rev 1.08.08 Jan. 22 2005 Daniele Venzano use netif_msg for debugging messages
   Rev 1.08.07 Nov.  2 2003 Daniele Venzano <venza@brownhat.org> add suspend/resume support
   Rev 1.08.06 Sep. 24 2002 Mufasa Yang bug fix for Tx timeout & add SiS963 support
   Rev 1.08.05 Jun.  6 2002 Mufasa Yang bug fix for read_eeprom & Tx descriptor over-boundary
   Rev 1.08.04 Apr. 25 2002 Mufasa Yang <mufasa@sis.com.tw> added SiS962 support
   Rev 1.08.03 Feb.  1 2002 Matt Domsch <Matt_Domsch@dell.com> update to use library crc32 function
   Rev 1.08.02 Nov. 30 2001 Hui-Fen Hsu workaround for EDB & bug fix for dhcp problem
   Rev 1.08.01 Aug. 25 2001 Hui-Fen Hsu update for 630ET & workaround for ICS1893 PHY
   Rev 1.08.00 Jun. 11 2001 Hui-Fen Hsu workaround for RTL8201 PHY and some bug fix
   Rev 1.07.11 Apr.  2 2001 Hui-Fen Hsu updates PCI drivers to use the new pci_set_dma_mask for kernel 2.4.3
   Rev 1.07.10 Mar.  1 2001 Hui-Fen Hsu <hfhsu@sis.com.tw> some bug fix & 635M/B support
   Rev 1.07.09 Feb.  9 2001 Dave Jones <davej@suse.de> PCI enable cleanup
   Rev 1.07.08 Jan.  8 2001 Lei-Chun Chang added RTL8201 PHY support
   Rev 1.07.07 Nov. 29 2000 Lei-Chun Chang added kernel-doc extractable documentation and 630 workaround fix
   Rev 1.07.06 Nov.  7 2000 Jeff Garzik <jgarzik@pobox.com> some bug fix and cleaning
   Rev 1.07.05 Nov.  6 2000 metapirat<metapirat@gmx.de> contribute media type select by ifconfig
   Rev 1.07.04 Sep.  6 2000 Lei-Chun Chang added ICS1893 PHY support
   Rev 1.07.03 Aug. 24 2000 Lei-Chun Chang (lcchang@sis.com.tw) modified 630E equalizer workaround rule
   Rev 1.07.01 Aug. 08 2000 Ollie Lho minor update for SiS 630E and SiS 630E A1
   Rev 1.07    Mar. 07 2000 Ollie Lho bug fix in Rx buffer ring
   Rev 1.06.04 Feb. 11 2000 Jeff Garzik <jgarzik@pobox.com> softnet and init for kernel 2.4
   Rev 1.06.03 Dec. 23 1999 Ollie Lho Third release
   Rev 1.06.02 Nov. 23 1999 Ollie Lho bug in mac probing fixed
   Rev 1.06.01 Nov. 16 1999 Ollie Lho CRC calculation provide by Joseph Zbiciak (im14u2c@primenet.com)
   Rev 1.06 Nov. 4 1999 Ollie Lho (ollie@sis.com.tw) Second release
   Rev 1.05.05 Oct. 29 1999 Ollie Lho (ollie@sis.com.tw) Single buffer Tx/Rx
   Chin-Shan Li (lcs@sis.com.tw) Added AMD Am79c901 HomePNA PHY support
   Rev 1.05 Aug. 7 1999 Jim Huang (cmhuang@sis.com.tw) Initial release
*/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/mii.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>

#include <asm/processor.h>      /* Processor type for cache alignment. */
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>	/* User space memory access functions */

#include "sis900.h"

#define SIS900_MODULE_NAME "sis900"
#define SIS900_DRV_VERSION "v1.08.10 Apr. 2 2006"

static const char version[] =
	KERN_INFO "sis900.c: " SIS900_DRV_VERSION "\n";

static int max_interrupt_work = 40;
static int multicast_filter_limit = 128;

static int sis900_debug = -1; /* Use SIS900_DEF_MSG as value */

#define SIS900_DEF_MSG \
	(NETIF_MSG_DRV		| \
	 NETIF_MSG_LINK		| \
	 NETIF_MSG_RX_ERR	| \
	 NETIF_MSG_TX_ERR)

/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT  (4*HZ)

enum {
	SIS_900 = 0,
	SIS_7016
};
static const char * card_names[] = {
	"SiS 900 PCI Fast Ethernet",
	"SiS 7016 PCI Fast Ethernet"
};
static DEFINE_PCI_DEVICE_TABLE(sis900_pci_tbl) = {
	{PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_900,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, SIS_900},
	{PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_7016,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, SIS_7016},
	{0,}
};
MODULE_DEVICE_TABLE (pci, sis900_pci_tbl);

static void sis900_read_mode(struct net_device *net_dev, int *speed, int *duplex);

static const struct mii_chip_info {
	const char * name;
	u16 phy_id0;
	u16 phy_id1;
	u8  phy_types;
#define	HOME 	0x0001
#define LAN	0x0002
#define MIX	0x0003
#define UNKNOWN	0x0
} mii_chip_table[] = {
	{ "SiS 900 Internal MII PHY", 		0x001d, 0x8000, LAN },
	{ "SiS 7014 Physical Layer Solution", 	0x0016, 0xf830, LAN },
	{ "SiS 900 on Foxconn 661 7MI",         0x0143, 0xBC70, LAN },
	{ "Altimata AC101LF PHY",               0x0022, 0x5520, LAN },
	{ "ADM 7001 LAN PHY",			0x002e, 0xcc60, LAN },
	{ "AMD 79C901 10BASE-T PHY",  		0x0000, 0x6B70, LAN },
	{ "AMD 79C901 HomePNA PHY",		0x0000, 0x6B90, HOME},
	{ "ICS LAN PHY",			0x0015, 0xF440, LAN },
	{ "ICS LAN PHY",			0x0143, 0xBC70, LAN },
	{ "NS 83851 PHY",			0x2000, 0x5C20, MIX },
	{ "NS 83847 PHY",                       0x2000, 0x5C30, MIX },
	{ "Realtek RTL8201 PHY",		0x0000, 0x8200, LAN },
	{ "VIA 6103 PHY",			0x0101, 0x8f20, LAN },
	{NULL,},
};

struct mii_phy {
	struct mii_phy * next;
	int phy_addr;
	u16 phy_id0;
	u16 phy_id1;
	u16 status;
	u8  phy_types;
};

typedef struct _BufferDesc {
	u32 link;
	u32 cmdsts;
	u32 bufptr;
} BufferDesc;

struct sis900_private {
	struct pci_dev * pci_dev;

	spinlock_t lock;

	struct mii_phy * mii;
	struct mii_phy * first_mii; /* record the first mii structure */
	unsigned int cur_phy;
	struct mii_if_info mii_info;

	void __iomem	*ioaddr;

	struct timer_list timer; /* Link status detection timer. */
	u8 autong_complete; /* 1: auto-negotiate complete  */

	u32 msg_enable;

	unsigned int cur_rx, dirty_rx; /* producer/comsumer pointers for Tx/Rx ring */
	unsigned int cur_tx, dirty_tx;

	/* The saved address of a sent/receive-in-place packet buffer */
	struct sk_buff *tx_skbuff[NUM_TX_DESC];
	struct sk_buff *rx_skbuff[NUM_RX_DESC];
	BufferDesc *tx_ring;
	BufferDesc *rx_ring;

	dma_addr_t tx_ring_dma;
	dma_addr_t rx_ring_dma;

	unsigned int tx_full; /* The Tx queue is full. */
	u8 host_bridge_rev;
	u8 chipset_rev;
};

MODULE_AUTHOR("Jim Huang <cmhuang@sis.com.tw>, Ollie Lho <ollie@sis.com.tw>");
MODULE_DESCRIPTION("SiS 900 PCI Fast Ethernet driver");
MODULE_LICENSE("GPL");

module_param(multicast_filter_limit, int, 0444);
module_param(max_interrupt_work, int, 0444);
module_param(sis900_debug, int, 0444);
MODULE_PARM_DESC(multicast_filter_limit, "SiS 900/7016 maximum number of filtered multicast addresses");
MODULE_PARM_DESC(max_interrupt_work, "SiS 900/7016 maximum events handled per interrupt");
MODULE_PARM_DESC(sis900_debug, "SiS 900/7016 bitmapped debugging message level");

#define sw32(reg, val)	iowrite32(val, ioaddr + (reg))
#define sw8(reg, val)	iowrite8(val, ioaddr + (reg))
#define sr32(reg)	ioread32(ioaddr + (reg))
#define sr16(reg)	ioread16(ioaddr + (reg))

#ifdef CONFIG_NET_POLL_CONTROLLER
static void sis900_poll(struct net_device *dev);
#endif
static int sis900_open(struct net_device *net_dev);
static int sis900_mii_probe (struct net_device * net_dev);
static void sis900_init_rxfilter (struct net_device * net_dev);
static u16 read_eeprom(void __iomem *ioaddr, int location);
static int mdio_read(struct net_device *net_dev, int phy_id, int location);
static void mdio_write(struct net_device *net_dev, int phy_id, int location, int val);
static void sis900_timer(unsigned long data);
static void sis900_check_mode (struct net_device *net_dev, struct mii_phy *mii_phy);
static void sis900_tx_timeout(struct net_device *net_dev);
static void sis900_init_tx_ring(struct net_device *net_dev);
static void sis900_init_rx_ring(struct net_device *net_dev);
static netdev_tx_t sis900_start_xmit(struct sk_buff *skb,
				     struct net_device *net_dev);
static int sis900_rx(struct net_device *net_dev);
static void sis900_finish_xmit (struct net_device *net_dev);
static irqreturn_t sis900_interrupt(int irq, void *dev_instance);
static int sis900_close(struct net_device *net_dev);
static int mii_ioctl(struct net_device *net_dev, struct ifreq *rq, int cmd);
static u16 sis900_mcast_bitnr(u8 *addr, u8 revision);
static void set_rx_mode(struct net_device *net_dev);
static void sis900_reset(struct net_device *net_dev);
static void sis630_set_eq(struct net_device *net_dev, u8 revision);
static int sis900_set_config(struct net_device *dev, struct ifmap *map);
static u16 sis900_default_phy(struct net_device * net_dev);
static void sis900_set_capability( struct net_device *net_dev ,struct mii_phy *phy);
static u16 sis900_reset_phy(struct net_device *net_dev, int phy_addr);
static void sis900_auto_negotiate(struct net_device *net_dev, int phy_addr);
static void sis900_set_mode(struct sis900_private *, int speed, int duplex);
static const struct ethtool_ops sis900_ethtool_ops;

/**
 *	sis900_get_mac_addr - Get MAC address for stand alone SiS900 model
 *	@pci_dev: the sis900 pci device
 *	@net_dev: the net device to get address for
 *
 *	Older SiS900 and friends, use EEPROM to store MAC address.
 *	MAC address is read from read_eeprom() into @net_dev->dev_addr.
 */

static int sis900_get_mac_addr(struct pci_dev *pci_dev,
			       struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	u16 signature;
	int i;

	/* check to see if we have sane EEPROM */
	signature = (u16) read_eeprom(ioaddr, EEPROMSignature);
	if (signature == 0xffff || signature == 0x0000) {
		printk (KERN_WARNING "%s: Error EERPOM read %x\n",
			pci_name(pci_dev), signature);
		return 0;
	}

	/* get MAC address from EEPROM */
	for (i = 0; i < 3; i++)
	        ((u16 *)(net_dev->dev_addr))[i] = read_eeprom(ioaddr, i+EEPROMMACAddr);

	return 1;
}

/**
 *	sis630e_get_mac_addr - Get MAC address for SiS630E model
 *	@pci_dev: the sis900 pci device
 *	@net_dev: the net device to get address for
 *
 *	SiS630E model, use APC CMOS RAM to store MAC address.
 *	APC CMOS RAM is accessed through ISA bridge.
 *	MAC address is read into @net_dev->dev_addr.
 */

static int sis630e_get_mac_addr(struct pci_dev *pci_dev,
				struct net_device *net_dev)
{
	struct pci_dev *isa_bridge = NULL;
	u8 reg;
	int i;

	isa_bridge = pci_get_device(PCI_VENDOR_ID_SI, 0x0008, isa_bridge);
	if (!isa_bridge)
		isa_bridge = pci_get_device(PCI_VENDOR_ID_SI, 0x0018, isa_bridge);
	if (!isa_bridge) {
		printk(KERN_WARNING "%s: Can not find ISA bridge\n",
		       pci_name(pci_dev));
		return 0;
	}
	pci_read_config_byte(isa_bridge, 0x48, &reg);
	pci_write_config_byte(isa_bridge, 0x48, reg | 0x40);

	for (i = 0; i < 6; i++) {
		outb(0x09 + i, 0x70);
		((u8 *)(net_dev->dev_addr))[i] = inb(0x71);
	}

	pci_write_config_byte(isa_bridge, 0x48, reg & ~0x40);
	pci_dev_put(isa_bridge);

	return 1;
}


/**
 *	sis635_get_mac_addr - Get MAC address for SIS635 model
 *	@pci_dev: the sis900 pci device
 *	@net_dev: the net device to get address for
 *
 *	SiS635 model, set MAC Reload Bit to load Mac address from APC
 *	to rfdr. rfdr is accessed through rfcr. MAC address is read into
 *	@net_dev->dev_addr.
 */

static int sis635_get_mac_addr(struct pci_dev *pci_dev,
			       struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	u32 rfcrSave;
	u32 i;

	rfcrSave = sr32(rfcr);

	sw32(cr, rfcrSave | RELOAD);
	sw32(cr, 0);

	/* disable packet filtering before setting filter */
	sw32(rfcr, rfcrSave & ~RFEN);

	/* load MAC addr to filter data register */
	for (i = 0 ; i < 3 ; i++) {
		sw32(rfcr, (i << RFADDR_shift));
		*( ((u16 *)net_dev->dev_addr) + i) = sr16(rfdr);
	}

	/* enable packet filtering */
	sw32(rfcr, rfcrSave | RFEN);

	return 1;
}

/**
 *	sis96x_get_mac_addr - Get MAC address for SiS962 or SiS963 model
 *	@pci_dev: the sis900 pci device
 *	@net_dev: the net device to get address for
 *
 *	SiS962 or SiS963 model, use EEPROM to store MAC address. And EEPROM
 *	is shared by
 *	LAN and 1394. When access EEPROM, send EEREQ signal to hardware first
 *	and wait for EEGNT. If EEGNT is ON, EEPROM is permitted to be access
 *	by LAN, otherwise is not. After MAC address is read from EEPROM, send
 *	EEDONE signal to refuse EEPROM access by LAN.
 *	The EEPROM map of SiS962 or SiS963 is different to SiS900.
 *	The signature field in SiS962 or SiS963 spec is meaningless.
 *	MAC address is read into @net_dev->dev_addr.
 */

static int sis96x_get_mac_addr(struct pci_dev *pci_dev,
			       struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	int wait, rc = 0;

	sw32(mear, EEREQ);
	for (wait = 0; wait < 2000; wait++) {
		if (sr32(mear) & EEGNT) {
			u16 *mac = (u16 *)net_dev->dev_addr;
			int i;

			/* get MAC address from EEPROM */
			for (i = 0; i < 3; i++)
			        mac[i] = read_eeprom(ioaddr, i + EEPROMMACAddr);

			rc = 1;
			break;
		}
		udelay(1);
	}
	sw32(mear, EEDONE);
	return rc;
}

static const struct net_device_ops sis900_netdev_ops = {
	.ndo_open		 = sis900_open,
	.ndo_stop		= sis900_close,
	.ndo_start_xmit		= sis900_start_xmit,
	.ndo_set_config		= sis900_set_config,
	.ndo_set_rx_mode	= set_rx_mode,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_do_ioctl		= mii_ioctl,
	.ndo_tx_timeout		= sis900_tx_timeout,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller	= sis900_poll,
#endif
};

/**
 *	sis900_probe - Probe for sis900 device
 *	@pci_dev: the sis900 pci device
 *	@pci_id: the pci device ID
 *
 *	Check and probe sis900 net device for @pci_dev.
 *	Get mac address according to the chip revision,
 *	and assign SiS900-specific entries in the device structure.
 *	ie: sis900_open(), sis900_start_xmit(), sis900_close(), etc.
 */

static int sis900_probe(struct pci_dev *pci_dev,
			const struct pci_device_id *pci_id)
{
	struct sis900_private *sis_priv;
	struct net_device *net_dev;
	struct pci_dev *dev;
	dma_addr_t ring_dma;
	void *ring_space;
	void __iomem *ioaddr;
	int i, ret;
	const char *card_name = card_names[pci_id->driver_data];
	const char *dev_name = pci_name(pci_dev);

/* when built into the kernel, we only print version if device is found */
#ifndef MODULE
	static int printed_version;
	if (!printed_version++)
		printk(version);
#endif

	/* setup various bits in PCI command register */
	ret = pci_enable_device(pci_dev);
	if(ret) return ret;

	i = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32));
	if(i){
		printk(KERN_ERR "sis900.c: architecture does not support "
			"32bit PCI busmaster DMA\n");
		return i;
	}

	pci_set_master(pci_dev);

	net_dev = alloc_etherdev(sizeof(struct sis900_private));
	if (!net_dev)
		return -ENOMEM;
	SET_NETDEV_DEV(net_dev, &pci_dev->dev);

	/* We do a request_region() to register /proc/ioports info. */
	ret = pci_request_regions(pci_dev, "sis900");
	if (ret)
		goto err_out;

	/* IO region. */
	ioaddr = pci_iomap(pci_dev, 0, 0);
	if (!ioaddr) {
		ret = -ENOMEM;
		goto err_out_cleardev;
	}

	sis_priv = netdev_priv(net_dev);
	sis_priv->ioaddr = ioaddr;
	sis_priv->pci_dev = pci_dev;
	spin_lock_init(&sis_priv->lock);

	pci_set_drvdata(pci_dev, net_dev);

	ring_space = pci_alloc_consistent(pci_dev, TX_TOTAL_SIZE, &ring_dma);
	if (!ring_space) {
		ret = -ENOMEM;
		goto err_out_unmap;
	}
	sis_priv->tx_ring = ring_space;
	sis_priv->tx_ring_dma = ring_dma;

	ring_space = pci_alloc_consistent(pci_dev, RX_TOTAL_SIZE, &ring_dma);
	if (!ring_space) {
		ret = -ENOMEM;
		goto err_unmap_tx;
	}
	sis_priv->rx_ring = ring_space;
	sis_priv->rx_ring_dma = ring_dma;

	/* The SiS900-specific entries in the device structure. */
	net_dev->netdev_ops = &sis900_netdev_ops;
	net_dev->watchdog_timeo = TX_TIMEOUT;
	net_dev->ethtool_ops = &sis900_ethtool_ops;

	if (sis900_debug > 0)
		sis_priv->msg_enable = sis900_debug;
	else
		sis_priv->msg_enable = SIS900_DEF_MSG;

	sis_priv->mii_info.dev = net_dev;
	sis_priv->mii_info.mdio_read = mdio_read;
	sis_priv->mii_info.mdio_write = mdio_write;
	sis_priv->mii_info.phy_id_mask = 0x1f;
	sis_priv->mii_info.reg_num_mask = 0x1f;

	/* Get Mac address according to the chip revision */
	sis_priv->chipset_rev = pci_dev->revision;
	if(netif_msg_probe(sis_priv))
		printk(KERN_DEBUG "%s: detected revision %2.2x, "
				"trying to get MAC address...\n",
				dev_name, sis_priv->chipset_rev);

	ret = 0;
	if (sis_priv->chipset_rev == SIS630E_900_REV)
		ret = sis630e_get_mac_addr(pci_dev, net_dev);
	else if ((sis_priv->chipset_rev > 0x81) && (sis_priv->chipset_rev <= 0x90) )
		ret = sis635_get_mac_addr(pci_dev, net_dev);
	else if (sis_priv->chipset_rev == SIS96x_900_REV)
		ret = sis96x_get_mac_addr(pci_dev, net_dev);
	else
		ret = sis900_get_mac_addr(pci_dev, net_dev);

	if (!ret || !is_valid_ether_addr(net_dev->dev_addr)) {
		eth_hw_addr_random(net_dev);
		printk(KERN_WARNING "%s: Unreadable or invalid MAC address,"
				"using random generated one\n", dev_name);
	}

	/* 630ET : set the mii access mode as software-mode */
	if (sis_priv->chipset_rev == SIS630ET_900_REV)
		sw32(cr, ACCESSMODE | sr32(cr));

	/* probe for mii transceiver */
	if (sis900_mii_probe(net_dev) == 0) {
		printk(KERN_WARNING "%s: Error probing MII device.\n",
		       dev_name);
		ret = -ENODEV;
		goto err_unmap_rx;
	}

	/* save our host bridge revision */
	dev = pci_get_device(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_630, NULL);
	if (dev) {
		sis_priv->host_bridge_rev = dev->revision;
		pci_dev_put(dev);
	}

	ret = register_netdev(net_dev);
	if (ret)
		goto err_unmap_rx;

	/* print some information about our NIC */
	printk(KERN_INFO "%s: %s at 0x%p, IRQ %d, %pM\n",
	       net_dev->name, card_name, ioaddr, pci_dev->irq,
	       net_dev->dev_addr);

	/* Detect Wake on Lan support */
	ret = (sr32(CFGPMC) & PMESP) >> 27;
	if (netif_msg_probe(sis_priv) && (ret & PME_D3C) == 0)
		printk(KERN_INFO "%s: Wake on LAN only available from suspend to RAM.", net_dev->name);

	return 0;

err_unmap_rx:
	pci_free_consistent(pci_dev, RX_TOTAL_SIZE, sis_priv->rx_ring,
		sis_priv->rx_ring_dma);
err_unmap_tx:
	pci_free_consistent(pci_dev, TX_TOTAL_SIZE, sis_priv->tx_ring,
		sis_priv->tx_ring_dma);
err_out_unmap:
	pci_iounmap(pci_dev, ioaddr);
err_out_cleardev:
	pci_set_drvdata(pci_dev, NULL);
	pci_release_regions(pci_dev);
 err_out:
	free_netdev(net_dev);
	return ret;
}

/**
 *	sis900_mii_probe - Probe MII PHY for sis900
 *	@net_dev: the net device to probe for
 *
 *	Search for total of 32 possible mii phy addresses.
 *	Identify and set current phy if found one,
 *	return error if it failed to found.
 */

static int sis900_mii_probe(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	const char *dev_name = pci_name(sis_priv->pci_dev);
	u16 poll_bit = MII_STAT_LINK, status = 0;
	unsigned long timeout = jiffies + 5 * HZ;
	int phy_addr;

	sis_priv->mii = NULL;

	/* search for total of 32 possible mii phy addresses */
	for (phy_addr = 0; phy_addr < 32; phy_addr++) {
		struct mii_phy * mii_phy = NULL;
		u16 mii_status;
		int i;

		mii_phy = NULL;
		for(i = 0; i < 2; i++)
			mii_status = mdio_read(net_dev, phy_addr, MII_STATUS);

		if (mii_status == 0xffff || mii_status == 0x0000) {
			if (netif_msg_probe(sis_priv))
				printk(KERN_DEBUG "%s: MII at address %d"
						" not accessible\n",
						dev_name, phy_addr);
			continue;
		}

		if ((mii_phy = kmalloc(sizeof(struct mii_phy), GFP_KERNEL)) == NULL) {
			mii_phy = sis_priv->first_mii;
			while (mii_phy) {
				struct mii_phy *phy;
				phy = mii_phy;
				mii_phy = mii_phy->next;
				kfree(phy);
			}
			return 0;
		}

		mii_phy->phy_id0 = mdio_read(net_dev, phy_addr, MII_PHY_ID0);
		mii_phy->phy_id1 = mdio_read(net_dev, phy_addr, MII_PHY_ID1);
		mii_phy->phy_addr = phy_addr;
		mii_phy->status = mii_status;
		mii_phy->next = sis_priv->mii;
		sis_priv->mii = mii_phy;
		sis_priv->first_mii = mii_phy;

		for (i = 0; mii_chip_table[i].phy_id1; i++)
			if ((mii_phy->phy_id0 == mii_chip_table[i].phy_id0 ) &&
			    ((mii_phy->phy_id1 & 0xFFF0) == mii_chip_table[i].phy_id1)){
				mii_phy->phy_types = mii_chip_table[i].phy_types;
				if (mii_chip_table[i].phy_types == MIX)
					mii_phy->phy_types =
					    (mii_status & (MII_STAT_CAN_TX_FDX | MII_STAT_CAN_TX)) ? LAN : HOME;
				printk(KERN_INFO "%s: %s transceiver found "
							"at address %d.\n",
							dev_name,
							mii_chip_table[i].name,
							phy_addr);
				break;
			}

		if( !mii_chip_table[i].phy_id1 ) {
			printk(KERN_INFO "%s: Unknown PHY transceiver found at address %d.\n",
			       dev_name, phy_addr);
			mii_phy->phy_types = UNKNOWN;
		}
	}

	if (sis_priv->mii == NULL) {
		printk(KERN_INFO "%s: No MII transceivers found!\n", dev_name);
		return 0;
	}

	/* select default PHY for mac */
	sis_priv->mii = NULL;
	sis900_default_phy( net_dev );

	/* Reset phy if default phy is internal sis900 */
        if ((sis_priv->mii->phy_id0 == 0x001D) &&
	    ((sis_priv->mii->phy_id1&0xFFF0) == 0x8000))
        	status = sis900_reset_phy(net_dev, sis_priv->cur_phy);

        /* workaround for ICS1893 PHY */
        if ((sis_priv->mii->phy_id0 == 0x0015) &&
            ((sis_priv->mii->phy_id1&0xFFF0) == 0xF440))
            	mdio_write(net_dev, sis_priv->cur_phy, 0x0018, 0xD200);

	if(status & MII_STAT_LINK){
		while (poll_bit) {
			yield();

			poll_bit ^= (mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS) & poll_bit);
			if (time_after_eq(jiffies, timeout)) {
				printk(KERN_WARNING "%s: reset phy and link down now\n",
				       dev_name);
				return -ETIME;
			}
		}
	}

	if (sis_priv->chipset_rev == SIS630E_900_REV) {
		/* SiS 630E has some bugs on default value of PHY registers */
		mdio_write(net_dev, sis_priv->cur_phy, MII_ANADV, 0x05e1);
		mdio_write(net_dev, sis_priv->cur_phy, MII_CONFIG1, 0x22);
		mdio_write(net_dev, sis_priv->cur_phy, MII_CONFIG2, 0xff00);
		mdio_write(net_dev, sis_priv->cur_phy, MII_MASK, 0xffc0);
		//mdio_write(net_dev, sis_priv->cur_phy, MII_CONTROL, 0x1000);
	}

	if (sis_priv->mii->status & MII_STAT_LINK)
		netif_carrier_on(net_dev);
	else
		netif_carrier_off(net_dev);

	return 1;
}

/**
 *	sis900_default_phy - Select default PHY for sis900 mac.
 *	@net_dev: the net device to probe for
 *
 *	Select first detected PHY with link as default.
 *	If no one is link on, select PHY whose types is HOME as default.
 *	If HOME doesn't exist, select LAN.
 */

static u16 sis900_default_phy(struct net_device * net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
 	struct mii_phy *phy = NULL, *phy_home = NULL,
		*default_phy = NULL, *phy_lan = NULL;
	u16 status;

        for (phy=sis_priv->first_mii; phy; phy=phy->next) {
		status = mdio_read(net_dev, phy->phy_addr, MII_STATUS);
		status = mdio_read(net_dev, phy->phy_addr, MII_STATUS);

		/* Link ON & Not select default PHY & not ghost PHY */
		 if ((status & MII_STAT_LINK) && !default_phy &&
					(phy->phy_types != UNKNOWN))
		 	default_phy = phy;
		 else {
			status = mdio_read(net_dev, phy->phy_addr, MII_CONTROL);
			mdio_write(net_dev, phy->phy_addr, MII_CONTROL,
				status | MII_CNTL_AUTO | MII_CNTL_ISOLATE);
			if (phy->phy_types == HOME)
				phy_home = phy;
			else if(phy->phy_types == LAN)
				phy_lan = phy;
		 }
	}

	if (!default_phy && phy_home)
		default_phy = phy_home;
	else if (!default_phy && phy_lan)
		default_phy = phy_lan;
	else if (!default_phy)
		default_phy = sis_priv->first_mii;

	if (sis_priv->mii != default_phy) {
		sis_priv->mii = default_phy;
		sis_priv->cur_phy = default_phy->phy_addr;
		printk(KERN_INFO "%s: Using transceiver found at address %d as default\n",
		       pci_name(sis_priv->pci_dev), sis_priv->cur_phy);
	}

	sis_priv->mii_info.phy_id = sis_priv->cur_phy;

	status = mdio_read(net_dev, sis_priv->cur_phy, MII_CONTROL);
	status &= (~MII_CNTL_ISOLATE);

	mdio_write(net_dev, sis_priv->cur_phy, MII_CONTROL, status);
	status = mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS);
	status = mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS);

	return status;
}


/**
 * 	sis900_set_capability - set the media capability of network adapter.
 *	@net_dev : the net device to probe for
 *	@phy : default PHY
 *
 *	Set the media capability of network adapter according to
 *	mii status register. It's necessary before auto-negotiate.
 */

static void sis900_set_capability(struct net_device *net_dev, struct mii_phy *phy)
{
	u16 cap;
	u16 status;

	status = mdio_read(net_dev, phy->phy_addr, MII_STATUS);
	status = mdio_read(net_dev, phy->phy_addr, MII_STATUS);

	cap = MII_NWAY_CSMA_CD |
		((phy->status & MII_STAT_CAN_TX_FDX)? MII_NWAY_TX_FDX:0) |
		((phy->status & MII_STAT_CAN_TX)    ? MII_NWAY_TX:0) |
		((phy->status & MII_STAT_CAN_T_FDX) ? MII_NWAY_T_FDX:0)|
		((phy->status & MII_STAT_CAN_T)     ? MII_NWAY_T:0);

	mdio_write(net_dev, phy->phy_addr, MII_ANADV, cap);
}


/* Delay between EEPROM clock transitions. */
#define eeprom_delay()	sr32(mear)

/**
 *	read_eeprom - Read Serial EEPROM
 *	@ioaddr: base i/o address
 *	@location: the EEPROM location to read
 *
 *	Read Serial EEPROM through EEPROM Access Register.
 *	Note that location is in word (16 bits) unit
 */

static u16 read_eeprom(void __iomem *ioaddr, int location)
{
	u32 read_cmd = location | EEread;
	int i;
	u16 retval = 0;

	sw32(mear, 0);
	eeprom_delay();
	sw32(mear, EECS);
	eeprom_delay();

	/* Shift the read command (9) bits out. */
	for (i = 8; i >= 0; i--) {
		u32 dataval = (read_cmd & (1 << i)) ? EEDI | EECS : EECS;

		sw32(mear, dataval);
		eeprom_delay();
		sw32(mear, dataval | EECLK);
		eeprom_delay();
	}
	sw32(mear, EECS);
	eeprom_delay();

	/* read the 16-bits data in */
	for (i = 16; i > 0; i--) {
		sw32(mear, EECS);
		eeprom_delay();
		sw32(mear, EECS | EECLK);
		eeprom_delay();
		retval = (retval << 1) | ((sr32(mear) & EEDO) ? 1 : 0);
		eeprom_delay();
	}

	/* Terminate the EEPROM access. */
	sw32(mear, 0);
	eeprom_delay();

	return retval;
}

/* Read and write the MII management registers using software-generated
   serial MDIO protocol. Note that the command bits and data bits are
   send out separately */
#define mdio_delay()	sr32(mear)

static void mdio_idle(struct sis900_private *sp)
{
	void __iomem *ioaddr = sp->ioaddr;

	sw32(mear, MDIO | MDDIR);
	mdio_delay();
	sw32(mear, MDIO | MDDIR | MDC);
}

/* Synchronize the MII management interface by shifting 32 one bits out. */
static void mdio_reset(struct sis900_private *sp)
{
	void __iomem *ioaddr = sp->ioaddr;
	int i;

	for (i = 31; i >= 0; i--) {
		sw32(mear, MDDIR | MDIO);
		mdio_delay();
		sw32(mear, MDDIR | MDIO | MDC);
		mdio_delay();
	}
}

/**
 *	mdio_read - read MII PHY register
 *	@net_dev: the net device to read
 *	@phy_id: the phy address to read
 *	@location: the phy regiester id to read
 *
 *	Read MII registers through MDIO and MDC
 *	using MDIO management frame structure and protocol(defined by ISO/IEC).
 *	Please see SiS7014 or ICS spec
 */

static int mdio_read(struct net_device *net_dev, int phy_id, int location)
{
	int mii_cmd = MIIread|(phy_id<<MIIpmdShift)|(location<<MIIregShift);
	struct sis900_private *sp = netdev_priv(net_dev);
	void __iomem *ioaddr = sp->ioaddr;
	u16 retval = 0;
	int i;

	mdio_reset(sp);
	mdio_idle(sp);

	for (i = 15; i >= 0; i--) {
		int dataval = (mii_cmd & (1 << i)) ? MDDIR | MDIO : MDDIR;

		sw32(mear, dataval);
		mdio_delay();
		sw32(mear, dataval | MDC);
		mdio_delay();
	}

	/* Read the 16 data bits. */
	for (i = 16; i > 0; i--) {
		sw32(mear, 0);
		mdio_delay();
		retval = (retval << 1) | ((sr32(mear) & MDIO) ? 1 : 0);
		sw32(mear, MDC);
		mdio_delay();
	}
	sw32(mear, 0x00);

	return retval;
}

/**
 *	mdio_write - write MII PHY register
 *	@net_dev: the net device to write
 *	@phy_id: the phy address to write
 *	@location: the phy regiester id to write
 *	@value: the register value to write with
 *
 *	Write MII registers with @value through MDIO and MDC
 *	using MDIO management frame structure and protocol(defined by ISO/IEC)
 *	please see SiS7014 or ICS spec
 */

static void mdio_write(struct net_device *net_dev, int phy_id, int location,
			int value)
{
	int mii_cmd = MIIwrite|(phy_id<<MIIpmdShift)|(location<<MIIregShift);
	struct sis900_private *sp = netdev_priv(net_dev);
	void __iomem *ioaddr = sp->ioaddr;
	int i;

	mdio_reset(sp);
	mdio_idle(sp);

	/* Shift the command bits out. */
	for (i = 15; i >= 0; i--) {
		int dataval = (mii_cmd & (1 << i)) ? MDDIR | MDIO : MDDIR;

		sw8(mear, dataval);
		mdio_delay();
		sw8(mear, dataval | MDC);
		mdio_delay();
	}
	mdio_delay();

	/* Shift the value bits out. */
	for (i = 15; i >= 0; i--) {
		int dataval = (value & (1 << i)) ? MDDIR | MDIO : MDDIR;

		sw32(mear, dataval);
		mdio_delay();
		sw32(mear, dataval | MDC);
		mdio_delay();
	}
	mdio_delay();

	/* Clear out extra bits. */
	for (i = 2; i > 0; i--) {
		sw8(mear, 0);
		mdio_delay();
		sw8(mear, MDC);
		mdio_delay();
	}
	sw32(mear, 0x00);
}


/**
 *	sis900_reset_phy - reset sis900 mii phy.
 *	@net_dev: the net device to write
 *	@phy_addr: default phy address
 *
 *	Some specific phy can't work properly without reset.
 *	This function will be called during initialization and
 *	link status change from ON to DOWN.
 */

static u16 sis900_reset_phy(struct net_device *net_dev, int phy_addr)
{
	int i;
	u16 status;

	for (i = 0; i < 2; i++)
		status = mdio_read(net_dev, phy_addr, MII_STATUS);

	mdio_write( net_dev, phy_addr, MII_CONTROL, MII_CNTL_RESET );

	return status;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * Polling 'interrupt' - used by things like netconsole to send skbs
 * without having to re-enable interrupts. It's not called while
 * the interrupt routine is executing.
*/
static void sis900_poll(struct net_device *dev)
{
	struct sis900_private *sp = netdev_priv(dev);
	const int irq = sp->pci_dev->irq;

	disable_irq(irq);
	sis900_interrupt(irq, dev);
	enable_irq(irq);
}
#endif

/**
 *	sis900_open - open sis900 device
 *	@net_dev: the net device to open
 *
 *	Do some initialization and start net interface.
 *	enable interrupts and set sis900 timer.
 */

static int
sis900_open(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	int ret;

	/* Soft reset the chip. */
	sis900_reset(net_dev);

	/* Equalizer workaround Rule */
	sis630_set_eq(net_dev, sis_priv->chipset_rev);

	ret = request_irq(sis_priv->pci_dev->irq, sis900_interrupt, IRQF_SHARED,
			  net_dev->name, net_dev);
	if (ret)
		return ret;

	sis900_init_rxfilter(net_dev);

	sis900_init_tx_ring(net_dev);
	sis900_init_rx_ring(net_dev);

	set_rx_mode(net_dev);

	netif_start_queue(net_dev);

	/* Workaround for EDB */
	sis900_set_mode(sis_priv, HW_SPEED_10_MBPS, FDX_CAPABLE_HALF_SELECTED);

	/* Enable all known interrupts by setting the interrupt mask. */
	sw32(imr, RxSOVR | RxORN | RxERR | RxOK | TxURN | TxERR | TxIDLE);
	sw32(cr, RxENA | sr32(cr));
	sw32(ier, IE);

	sis900_check_mode(net_dev, sis_priv->mii);

	/* Set the timer to switch to check for link beat and perhaps switch
	   to an alternate media type. */
	init_timer(&sis_priv->timer);
	sis_priv->timer.expires = jiffies + HZ;
	sis_priv->timer.data = (unsigned long)net_dev;
	sis_priv->timer.function = sis900_timer;
	add_timer(&sis_priv->timer);

	return 0;
}

/**
 *	sis900_init_rxfilter - Initialize the Rx filter
 *	@net_dev: the net device to initialize for
 *
 *	Set receive filter address to our MAC address
 *	and enable packet filtering.
 */

static void
sis900_init_rxfilter (struct net_device * net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	u32 rfcrSave;
	u32 i;

	rfcrSave = sr32(rfcr);

	/* disable packet filtering before setting filter */
	sw32(rfcr, rfcrSave & ~RFEN);

	/* load MAC addr to filter data register */
	for (i = 0 ; i < 3 ; i++) {
		u32 w = (u32) *((u16 *)(net_dev->dev_addr)+i);

		sw32(rfcr, i << RFADDR_shift);
		sw32(rfdr, w);

		if (netif_msg_hw(sis_priv)) {
			printk(KERN_DEBUG "%s: Receive Filter Addrss[%d]=%x\n",
			       net_dev->name, i, sr32(rfdr));
		}
	}

	/* enable packet filtering */
	sw32(rfcr, rfcrSave | RFEN);
}

/**
 *	sis900_init_tx_ring - Initialize the Tx descriptor ring
 *	@net_dev: the net device to initialize for
 *
 *	Initialize the Tx descriptor ring,
 */

static void
sis900_init_tx_ring(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	int i;

	sis_priv->tx_full = 0;
	sis_priv->dirty_tx = sis_priv->cur_tx = 0;

	for (i = 0; i < NUM_TX_DESC; i++) {
		sis_priv->tx_skbuff[i] = NULL;

		sis_priv->tx_ring[i].link = sis_priv->tx_ring_dma +
			((i+1)%NUM_TX_DESC)*sizeof(BufferDesc);
		sis_priv->tx_ring[i].cmdsts = 0;
		sis_priv->tx_ring[i].bufptr = 0;
	}

	/* load Transmit Descriptor Register */
	sw32(txdp, sis_priv->tx_ring_dma);
	if (netif_msg_hw(sis_priv))
		printk(KERN_DEBUG "%s: TX descriptor register loaded with: %8.8x\n",
		       net_dev->name, sr32(txdp));
}

/**
 *	sis900_init_rx_ring - Initialize the Rx descriptor ring
 *	@net_dev: the net device to initialize for
 *
 *	Initialize the Rx descriptor ring,
 *	and pre-allocate recevie buffers (socket buffer)
 */

static void
sis900_init_rx_ring(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	int i;

	sis_priv->cur_rx = 0;
	sis_priv->dirty_rx = 0;

	/* init RX descriptor */
	for (i = 0; i < NUM_RX_DESC; i++) {
		sis_priv->rx_skbuff[i] = NULL;

		sis_priv->rx_ring[i].link = sis_priv->rx_ring_dma +
			((i+1)%NUM_RX_DESC)*sizeof(BufferDesc);
		sis_priv->rx_ring[i].cmdsts = 0;
		sis_priv->rx_ring[i].bufptr = 0;
	}

	/* allocate sock buffers */
	for (i = 0; i < NUM_RX_DESC; i++) {
		struct sk_buff *skb;

		if ((skb = netdev_alloc_skb(net_dev, RX_BUF_SIZE)) == NULL) {
			/* not enough memory for skbuff, this makes a "hole"
			   on the buffer ring, it is not clear how the
			   hardware will react to this kind of degenerated
			   buffer */
			break;
		}
		sis_priv->rx_skbuff[i] = skb;
		sis_priv->rx_ring[i].cmdsts = RX_BUF_SIZE;
                sis_priv->rx_ring[i].bufptr = pci_map_single(sis_priv->pci_dev,
                        skb->data, RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
	}
	sis_priv->dirty_rx = (unsigned int) (i - NUM_RX_DESC);

	/* load Receive Descriptor Register */
	sw32(rxdp, sis_priv->rx_ring_dma);
	if (netif_msg_hw(sis_priv))
		printk(KERN_DEBUG "%s: RX descriptor register loaded with: %8.8x\n",
		       net_dev->name, sr32(rxdp));
}

/**
 *	sis630_set_eq - set phy equalizer value for 630 LAN
 *	@net_dev: the net device to set equalizer value
 *	@revision: 630 LAN revision number
 *
 *	630E equalizer workaround rule(Cyrus Huang 08/15)
 *	PHY register 14h(Test)
 *	Bit 14: 0 -- Automatically detect (default)
 *		1 -- Manually set Equalizer filter
 *	Bit 13: 0 -- (Default)
 *		1 -- Speed up convergence of equalizer setting
 *	Bit 9 : 0 -- (Default)
 *		1 -- Disable Baseline Wander
 *	Bit 3~7   -- Equalizer filter setting
 *	Link ON: Set Bit 9, 13 to 1, Bit 14 to 0
 *	Then calculate equalizer value
 *	Then set equalizer value, and set Bit 14 to 1, Bit 9 to 0
 *	Link Off:Set Bit 13 to 1, Bit 14 to 0
 *	Calculate Equalizer value:
 *	When Link is ON and Bit 14 is 0, SIS900PHY will auto-detect proper equalizer value.
 *	When the equalizer is stable, this value is not a fixed value. It will be within
 *	a small range(eg. 7~9). Then we get a minimum and a maximum value(eg. min=7, max=9)
 *	0 <= max <= 4  --> set equalizer to max
 *	5 <= max <= 14 --> set equalizer to max+1 or set equalizer to max+2 if max == min
 *	max >= 15      --> set equalizer to max+5 or set equalizer to max+6 if max == min
 */

static void sis630_set_eq(struct net_device *net_dev, u8 revision)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	u16 reg14h, eq_value=0, max_value=0, min_value=0;
	int i, maxcount=10;

	if ( !(revision == SIS630E_900_REV || revision == SIS630EA1_900_REV ||
	       revision == SIS630A_900_REV || revision ==  SIS630ET_900_REV) )
		return;

	if (netif_carrier_ok(net_dev)) {
		reg14h = mdio_read(net_dev, sis_priv->cur_phy, MII_RESV);
		mdio_write(net_dev, sis_priv->cur_phy, MII_RESV,
					(0x2200 | reg14h) & 0xBFFF);
		for (i=0; i < maxcount; i++) {
			eq_value = (0x00F8 & mdio_read(net_dev,
					sis_priv->cur_phy, MII_RESV)) >> 3;
			if (i == 0)
				max_value=min_value=eq_value;
			max_value = (eq_value > max_value) ?
						eq_value : max_value;
			min_value = (eq_value < min_value) ?
						eq_value : min_value;
		}
		/* 630E rule to determine the equalizer value */
		if (revision == SIS630E_900_REV || revision == SIS630EA1_900_REV ||
		    revision == SIS630ET_900_REV) {
			if (max_value < 5)
				eq_value = max_value;
			else if (max_value >= 5 && max_value < 15)
				eq_value = (max_value == min_value) ?
						max_value+2 : max_value+1;
			else if (max_value >= 15)
				eq_value=(max_value == min_value) ?
						max_value+6 : max_value+5;
		}
		/* 630B0&B1 rule to determine the equalizer value */
		if (revision == SIS630A_900_REV &&
		    (sis_priv->host_bridge_rev == SIS630B0 ||
		     sis_priv->host_bridge_rev == SIS630B1)) {
			if (max_value == 0)
				eq_value = 3;
			else
				eq_value = (max_value + min_value + 1)/2;
		}
		/* write equalizer value and setting */
		reg14h = mdio_read(net_dev, sis_priv->cur_phy, MII_RESV);
		reg14h = (reg14h & 0xFF07) | ((eq_value << 3) & 0x00F8);
		reg14h = (reg14h | 0x6000) & 0xFDFF;
		mdio_write(net_dev, sis_priv->cur_phy, MII_RESV, reg14h);
	} else {
		reg14h = mdio_read(net_dev, sis_priv->cur_phy, MII_RESV);
		if (revision == SIS630A_900_REV &&
		    (sis_priv->host_bridge_rev == SIS630B0 ||
		     sis_priv->host_bridge_rev == SIS630B1))
			mdio_write(net_dev, sis_priv->cur_phy, MII_RESV,
						(reg14h | 0x2200) & 0xBFFF);
		else
			mdio_write(net_dev, sis_priv->cur_phy, MII_RESV,
						(reg14h | 0x2000) & 0xBFFF);
	}
}

/**
 *	sis900_timer - sis900 timer routine
 *	@data: pointer to sis900 net device
 *
 *	On each timer ticks we check two things,
 *	link status (ON/OFF) and link mode (10/100/Full/Half)
 */

static void sis900_timer(unsigned long data)
{
	struct net_device *net_dev = (struct net_device *)data;
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	struct mii_phy *mii_phy = sis_priv->mii;
	static const int next_tick = 5*HZ;
	u16 status;

	if (!sis_priv->autong_complete){
		int uninitialized_var(speed), duplex = 0;

		sis900_read_mode(net_dev, &speed, &duplex);
		if (duplex){
			sis900_set_mode(sis_priv, speed, duplex);
			sis630_set_eq(net_dev, sis_priv->chipset_rev);
			netif_start_queue(net_dev);
		}

		sis_priv->timer.expires = jiffies + HZ;
		add_timer(&sis_priv->timer);
		return;
	}

	status = mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS);
	status = mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS);

	/* Link OFF -> ON */
	if (!netif_carrier_ok(net_dev)) {
	LookForLink:
		/* Search for new PHY */
		status = sis900_default_phy(net_dev);
		mii_phy = sis_priv->mii;

		if (status & MII_STAT_LINK){
			sis900_check_mode(net_dev, mii_phy);
			netif_carrier_on(net_dev);
		}
	} else {
	/* Link ON -> OFF */
                if (!(status & MII_STAT_LINK)){
                	netif_carrier_off(net_dev);
			if(netif_msg_link(sis_priv))
                		printk(KERN_INFO "%s: Media Link Off\n", net_dev->name);

                	/* Change mode issue */
                	if ((mii_phy->phy_id0 == 0x001D) &&
			    ((mii_phy->phy_id1 & 0xFFF0) == 0x8000))
               			sis900_reset_phy(net_dev,  sis_priv->cur_phy);

			sis630_set_eq(net_dev, sis_priv->chipset_rev);

                	goto LookForLink;
                }
	}

	sis_priv->timer.expires = jiffies + next_tick;
	add_timer(&sis_priv->timer);
}

/**
 *	sis900_check_mode - check the media mode for sis900
 *	@net_dev: the net device to be checked
 *	@mii_phy: the mii phy
 *
 *	Older driver gets the media mode from mii status output
 *	register. Now we set our media capability and auto-negotiate
 *	to get the upper bound of speed and duplex between two ends.
 *	If the types of mii phy is HOME, it doesn't need to auto-negotiate
 *	and autong_complete should be set to 1.
 */

static void sis900_check_mode(struct net_device *net_dev, struct mii_phy *mii_phy)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	int speed, duplex;

	if (mii_phy->phy_types == LAN) {
		sw32(cfg, ~EXD & sr32(cfg));
		sis900_set_capability(net_dev , mii_phy);
		sis900_auto_negotiate(net_dev, sis_priv->cur_phy);
	} else {
		sw32(cfg, EXD | sr32(cfg));
		speed = HW_SPEED_HOME;
		duplex = FDX_CAPABLE_HALF_SELECTED;
		sis900_set_mode(sis_priv, speed, duplex);
		sis_priv->autong_complete = 1;
	}
}

/**
 *	sis900_set_mode - Set the media mode of mac register.
 *	@sp:     the device private data
 *	@speed : the transmit speed to be determined
 *	@duplex: the duplex mode to be determined
 *
 *	Set the media mode of mac register txcfg/rxcfg according to
 *	speed and duplex of phy. Bit EDB_MASTER_EN indicates the EDB
 *	bus is used instead of PCI bus. When this bit is set 1, the
 *	Max DMA Burst Size for TX/RX DMA should be no larger than 16
 *	double words.
 */

static void sis900_set_mode(struct sis900_private *sp, int speed, int duplex)
{
	void __iomem *ioaddr = sp->ioaddr;
	u32 tx_flags = 0, rx_flags = 0;

	if (sr32( cfg) & EDB_MASTER_EN) {
		tx_flags = TxATP | (DMA_BURST_64 << TxMXDMA_shift) |
					(TX_FILL_THRESH << TxFILLT_shift);
		rx_flags = DMA_BURST_64 << RxMXDMA_shift;
	} else {
		tx_flags = TxATP | (DMA_BURST_512 << TxMXDMA_shift) |
					(TX_FILL_THRESH << TxFILLT_shift);
		rx_flags = DMA_BURST_512 << RxMXDMA_shift;
	}

	if (speed == HW_SPEED_HOME || speed == HW_SPEED_10_MBPS) {
		rx_flags |= (RxDRNT_10 << RxDRNT_shift);
		tx_flags |= (TxDRNT_10 << TxDRNT_shift);
	} else {
		rx_flags |= (RxDRNT_100 << RxDRNT_shift);
		tx_flags |= (TxDRNT_100 << TxDRNT_shift);
	}

	if (duplex == FDX_CAPABLE_FULL_SELECTED) {
		tx_flags |= (TxCSI | TxHBI);
		rx_flags |= RxATX;
	}

#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
	/* Can accept Jumbo packet */
	rx_flags |= RxAJAB;
#endif

	sw32(txcfg, tx_flags);
	sw32(rxcfg, rx_flags);
}

/**
 *	sis900_auto_negotiate - Set the Auto-Negotiation Enable/Reset bit.
 *	@net_dev: the net device to read mode for
 *	@phy_addr: mii phy address
 *
 *	If the adapter is link-on, set the auto-negotiate enable/reset bit.
 *	autong_complete should be set to 0 when starting auto-negotiation.
 *	autong_complete should be set to 1 if we didn't start auto-negotiation.
 *	sis900_timer will wait for link on again if autong_complete = 0.
 */

static void sis900_auto_negotiate(struct net_device *net_dev, int phy_addr)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	int i = 0;
	u32 status;

	for (i = 0; i < 2; i++)
		status = mdio_read(net_dev, phy_addr, MII_STATUS);

	if (!(status & MII_STAT_LINK)){
		if(netif_msg_link(sis_priv))
			printk(KERN_INFO "%s: Media Link Off\n", net_dev->name);
		sis_priv->autong_complete = 1;
		netif_carrier_off(net_dev);
		return;
	}

	/* (Re)start AutoNegotiate */
	mdio_write(net_dev, phy_addr, MII_CONTROL,
		   MII_CNTL_AUTO | MII_CNTL_RST_AUTO);
	sis_priv->autong_complete = 0;
}


/**
 *	sis900_read_mode - read media mode for sis900 internal phy
 *	@net_dev: the net device to read mode for
 *	@speed  : the transmit speed to be determined
 *	@duplex : the duplex mode to be determined
 *
 *	The capability of remote end will be put in mii register autorec
 *	after auto-negotiation. Use AND operation to get the upper bound
 *	of speed and duplex between two ends.
 */

static void sis900_read_mode(struct net_device *net_dev, int *speed, int *duplex)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	struct mii_phy *phy = sis_priv->mii;
	int phy_addr = sis_priv->cur_phy;
	u32 status;
	u16 autoadv, autorec;
	int i;

	for (i = 0; i < 2; i++)
		status = mdio_read(net_dev, phy_addr, MII_STATUS);

	if (!(status & MII_STAT_LINK))
		return;

	/* AutoNegotiate completed */
	autoadv = mdio_read(net_dev, phy_addr, MII_ANADV);
	autorec = mdio_read(net_dev, phy_addr, MII_ANLPAR);
	status = autoadv & autorec;

	*speed = HW_SPEED_10_MBPS;
	*duplex = FDX_CAPABLE_HALF_SELECTED;

	if (status & (MII_NWAY_TX | MII_NWAY_TX_FDX))
		*speed = HW_SPEED_100_MBPS;
	if (status & ( MII_NWAY_TX_FDX | MII_NWAY_T_FDX))
		*duplex = FDX_CAPABLE_FULL_SELECTED;

	sis_priv->autong_complete = 1;

	/* Workaround for Realtek RTL8201 PHY issue */
	if ((phy->phy_id0 == 0x0000) && ((phy->phy_id1 & 0xFFF0) == 0x8200)) {
		if (mdio_read(net_dev, phy_addr, MII_CONTROL) & MII_CNTL_FDX)
			*duplex = FDX_CAPABLE_FULL_SELECTED;
		if (mdio_read(net_dev, phy_addr, 0x0019) & 0x01)
			*speed = HW_SPEED_100_MBPS;
	}

	if(netif_msg_link(sis_priv))
		printk(KERN_INFO "%s: Media Link On %s %s-duplex\n",
	       				net_dev->name,
	       				*speed == HW_SPEED_100_MBPS ?
	       					"100mbps" : "10mbps",
	       				*duplex == FDX_CAPABLE_FULL_SELECTED ?
	       					"full" : "half");
}

/**
 *	sis900_tx_timeout - sis900 transmit timeout routine
 *	@net_dev: the net device to transmit
 *
 *	print transmit timeout status
 *	disable interrupts and do some tasks
 */

static void sis900_tx_timeout(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	unsigned long flags;
	int i;

	if (netif_msg_tx_err(sis_priv)) {
		printk(KERN_INFO "%s: Transmit timeout, status %8.8x %8.8x\n",
			net_dev->name, sr32(cr), sr32(isr));
	}

	/* Disable interrupts by clearing the interrupt mask. */
	sw32(imr, 0x0000);

	/* use spinlock to prevent interrupt handler accessing buffer ring */
	spin_lock_irqsave(&sis_priv->lock, flags);

	/* discard unsent packets */
	sis_priv->dirty_tx = sis_priv->cur_tx = 0;
	for (i = 0; i < NUM_TX_DESC; i++) {
		struct sk_buff *skb = sis_priv->tx_skbuff[i];

		if (skb) {
			pci_unmap_single(sis_priv->pci_dev,
				sis_priv->tx_ring[i].bufptr, skb->len,
				PCI_DMA_TODEVICE);
			dev_kfree_skb_irq(skb);
			sis_priv->tx_skbuff[i] = NULL;
			sis_priv->tx_ring[i].cmdsts = 0;
			sis_priv->tx_ring[i].bufptr = 0;
			net_dev->stats.tx_dropped++;
		}
	}
	sis_priv->tx_full = 0;
	netif_wake_queue(net_dev);

	spin_unlock_irqrestore(&sis_priv->lock, flags);

	net_dev->trans_start = jiffies; /* prevent tx timeout */

	/* load Transmit Descriptor Register */
	sw32(txdp, sis_priv->tx_ring_dma);

	/* Enable all known interrupts by setting the interrupt mask. */
	sw32(imr, RxSOVR | RxORN | RxERR | RxOK | TxURN | TxERR | TxIDLE);
}

/**
 *	sis900_start_xmit - sis900 start transmit routine
 *	@skb: socket buffer pointer to put the data being transmitted
 *	@net_dev: the net device to transmit with
 *
 *	Set the transmit buffer descriptor,
 *	and write TxENA to enable transmit state machine.
 *	tell upper layer if the buffer is full
 */

static netdev_tx_t
sis900_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	unsigned int  entry;
	unsigned long flags;
	unsigned int  index_cur_tx, index_dirty_tx;
	unsigned int  count_dirty_tx;

	/* Don't transmit data before the complete of auto-negotiation */
	if(!sis_priv->autong_complete){
		netif_stop_queue(net_dev);
		return NETDEV_TX_BUSY;
	}

	spin_lock_irqsave(&sis_priv->lock, flags);

	/* Calculate the next Tx descriptor entry. */
	entry = sis_priv->cur_tx % NUM_TX_DESC;
	sis_priv->tx_skbuff[entry] = skb;

	/* set the transmit buffer descriptor and enable Transmit State Machine */
	sis_priv->tx_ring[entry].bufptr = pci_map_single(sis_priv->pci_dev,
		skb->data, skb->len, PCI_DMA_TODEVICE);
	sis_priv->tx_ring[entry].cmdsts = (OWN | skb->len);
	sw32(cr, TxENA | sr32(cr));

	sis_priv->cur_tx ++;
	index_cur_tx = sis_priv->cur_tx;
	index_dirty_tx = sis_priv->dirty_tx;

	for (count_dirty_tx = 0; index_cur_tx != index_dirty_tx; index_dirty_tx++)
		count_dirty_tx ++;

	if (index_cur_tx == index_dirty_tx) {
		/* dirty_tx is met in the cycle of cur_tx, buffer full */
		sis_priv->tx_full = 1;
		netif_stop_queue(net_dev);
	} else if (count_dirty_tx < NUM_TX_DESC) {
		/* Typical path, tell upper layer that more transmission is possible */
		netif_start_queue(net_dev);
	} else {
		/* buffer full, tell upper layer no more transmission */
		sis_priv->tx_full = 1;
		netif_stop_queue(net_dev);
	}

	spin_unlock_irqrestore(&sis_priv->lock, flags);

	if (netif_msg_tx_queued(sis_priv))
		printk(KERN_DEBUG "%s: Queued Tx packet at %p size %d "
		       "to slot %d.\n",
		       net_dev->name, skb->data, (int)skb->len, entry);

	return NETDEV_TX_OK;
}

/**
 *	sis900_interrupt - sis900 interrupt handler
 *	@irq: the irq number
 *	@dev_instance: the client data object
 *
 *	The interrupt handler does all of the Rx thread work,
 *	and cleans up after the Tx thread
 */

static irqreturn_t sis900_interrupt(int irq, void *dev_instance)
{
	struct net_device *net_dev = dev_instance;
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	int boguscnt = max_interrupt_work;
	void __iomem *ioaddr = sis_priv->ioaddr;
	u32 status;
	unsigned int handled = 0;

	spin_lock (&sis_priv->lock);

	do {
		status = sr32(isr);

		if ((status & (HIBERR|TxURN|TxERR|TxIDLE|RxORN|RxERR|RxOK)) == 0)
			/* nothing intresting happened */
			break;
		handled = 1;

		/* why dow't we break after Tx/Rx case ?? keyword: full-duplex */
		if (status & (RxORN | RxERR | RxOK))
			/* Rx interrupt */
			sis900_rx(net_dev);

		if (status & (TxURN | TxERR | TxIDLE))
			/* Tx interrupt */
			sis900_finish_xmit(net_dev);

		/* something strange happened !!! */
		if (status & HIBERR) {
			if(netif_msg_intr(sis_priv))
				printk(KERN_INFO "%s: Abnormal interrupt, "
					"status %#8.8x.\n", net_dev->name, status);
			break;
		}
		if (--boguscnt < 0) {
			if(netif_msg_intr(sis_priv))
				printk(KERN_INFO "%s: Too much work at interrupt, "
					"interrupt status = %#8.8x.\n",
					net_dev->name, status);
			break;
		}
	} while (1);

	if(netif_msg_intr(sis_priv))
		printk(KERN_DEBUG "%s: exiting interrupt, "
		       "interrupt status = 0x%#8.8x.\n",
		       net_dev->name, sr32(isr));

	spin_unlock (&sis_priv->lock);
	return IRQ_RETVAL(handled);
}

/**
 *	sis900_rx - sis900 receive routine
 *	@net_dev: the net device which receives data
 *
 *	Process receive interrupt events,
 *	put buffer to higher layer and refill buffer pool
 *	Note: This function is called by interrupt handler,
 *	don't do "too much" work here
 */

static int sis900_rx(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	unsigned int entry = sis_priv->cur_rx % NUM_RX_DESC;
	u32 rx_status = sis_priv->rx_ring[entry].cmdsts;
	int rx_work_limit;

	if (netif_msg_rx_status(sis_priv))
		printk(KERN_DEBUG "sis900_rx, cur_rx:%4.4d, dirty_rx:%4.4d "
		       "status:0x%8.8x\n",
		       sis_priv->cur_rx, sis_priv->dirty_rx, rx_status);
	rx_work_limit = sis_priv->dirty_rx + NUM_RX_DESC - sis_priv->cur_rx;

	while (rx_status & OWN) {
		unsigned int rx_size;
		unsigned int data_size;

		if (--rx_work_limit < 0)
			break;

		data_size = rx_status & DSIZE;
		rx_size = data_size - CRC_SIZE;

#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
		/* ``TOOLONG'' flag means jumbo packet received. */
		if ((rx_status & TOOLONG) && data_size <= MAX_FRAME_SIZE)
			rx_status &= (~ ((unsigned int)TOOLONG));
#endif

		if (rx_status & (ABORT|OVERRUN|TOOLONG|RUNT|RXISERR|CRCERR|FAERR)) {
			/* corrupted packet received */
			if (netif_msg_rx_err(sis_priv))
				printk(KERN_DEBUG "%s: Corrupted packet "
				       "received, buffer status = 0x%8.8x/%d.\n",
				       net_dev->name, rx_status, data_size);
			net_dev->stats.rx_errors++;
			if (rx_status & OVERRUN)
				net_dev->stats.rx_over_errors++;
			if (rx_status & (TOOLONG|RUNT))
				net_dev->stats.rx_length_errors++;
			if (rx_status & (RXISERR | FAERR))
				net_dev->stats.rx_frame_errors++;
			if (rx_status & CRCERR)
				net_dev->stats.rx_crc_errors++;
			/* reset buffer descriptor state */
			sis_priv->rx_ring[entry].cmdsts = RX_BUF_SIZE;
		} else {
			struct sk_buff * skb;
			struct sk_buff * rx_skb;

			pci_unmap_single(sis_priv->pci_dev,
				sis_priv->rx_ring[entry].bufptr, RX_BUF_SIZE,
				PCI_DMA_FROMDEVICE);

			/* refill the Rx buffer, what if there is not enough
			 * memory for new socket buffer ?? */
			if ((skb = netdev_alloc_skb(net_dev, RX_BUF_SIZE)) == NULL) {
				/*
				 * Not enough memory to refill the buffer
				 * so we need to recycle the old one so
				 * as to avoid creating a memory hole
				 * in the rx ring
				 */
				skb = sis_priv->rx_skbuff[entry];
				net_dev->stats.rx_dropped++;
				goto refill_rx_ring;
			}

			/* This situation should never happen, but due to
			   some unknown bugs, it is possible that
			   we are working on NULL sk_buff :-( */
			if (sis_priv->rx_skbuff[entry] == NULL) {
				if (netif_msg_rx_err(sis_priv))
					printk(KERN_WARNING "%s: NULL pointer "
					      "encountered in Rx ring\n"
					      "cur_rx:%4.4d, dirty_rx:%4.4d\n",
					      net_dev->name, sis_priv->cur_rx,
					      sis_priv->dirty_rx);
				dev_kfree_skb(skb);
				break;
			}

			/* give the socket buffer to upper layers */
			rx_skb = sis_priv->rx_skbuff[entry];
			skb_put(rx_skb, rx_size);
			rx_skb->protocol = eth_type_trans(rx_skb, net_dev);
			netif_rx(rx_skb);

			/* some network statistics */
			if ((rx_status & BCAST) == MCAST)
				net_dev->stats.multicast++;
			net_dev->stats.rx_bytes += rx_size;
			net_dev->stats.rx_packets++;
			sis_priv->dirty_rx++;
refill_rx_ring:
			sis_priv->rx_skbuff[entry] = skb;
			sis_priv->rx_ring[entry].cmdsts = RX_BUF_SIZE;
                	sis_priv->rx_ring[entry].bufptr =
				pci_map_single(sis_priv->pci_dev, skb->data,
					RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
		}
		sis_priv->cur_rx++;
		entry = sis_priv->cur_rx % NUM_RX_DESC;
		rx_status = sis_priv->rx_ring[entry].cmdsts;
	} // while

	/* refill the Rx buffer, what if the rate of refilling is slower
	 * than consuming ?? */
	for (; sis_priv->cur_rx != sis_priv->dirty_rx; sis_priv->dirty_rx++) {
		struct sk_buff *skb;

		entry = sis_priv->dirty_rx % NUM_RX_DESC;

		if (sis_priv->rx_skbuff[entry] == NULL) {
			if ((skb = netdev_alloc_skb(net_dev, RX_BUF_SIZE)) == NULL) {
				/* not enough memory for skbuff, this makes a
				 * "hole" on the buffer ring, it is not clear
				 * how the hardware will react to this kind
				 * of degenerated buffer */
				if (netif_msg_rx_err(sis_priv))
					printk(KERN_INFO "%s: Memory squeeze, "
						"deferring packet.\n",
						net_dev->name);
				net_dev->stats.rx_dropped++;
				break;
			}
			sis_priv->rx_skbuff[entry] = skb;
			sis_priv->rx_ring[entry].cmdsts = RX_BUF_SIZE;
                	sis_priv->rx_ring[entry].bufptr =
				pci_map_single(sis_priv->pci_dev, skb->data,
					RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
		}
	}
	/* re-enable the potentially idle receive state matchine */
	sw32(cr , RxENA | sr32(cr));

	return 0;
}

/**
 *	sis900_finish_xmit - finish up transmission of packets
 *	@net_dev: the net device to be transmitted on
 *
 *	Check for error condition and free socket buffer etc
 *	schedule for more transmission as needed
 *	Note: This function is called by interrupt handler,
 *	don't do "too much" work here
 */

static void sis900_finish_xmit (struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);

	for (; sis_priv->dirty_tx != sis_priv->cur_tx; sis_priv->dirty_tx++) {
		struct sk_buff *skb;
		unsigned int entry;
		u32 tx_status;

		entry = sis_priv->dirty_tx % NUM_TX_DESC;
		tx_status = sis_priv->tx_ring[entry].cmdsts;

		if (tx_status & OWN) {
			/* The packet is not transmitted yet (owned by hardware) !
			 * Note: the interrupt is generated only when Tx Machine
			 * is idle, so this is an almost impossible case */
			break;
		}

		if (tx_status & (ABORT | UNDERRUN | OWCOLL)) {
			/* packet unsuccessfully transmitted */
			if (netif_msg_tx_err(sis_priv))
				printk(KERN_DEBUG "%s: Transmit "
				       "error, Tx status %8.8x.\n",
				       net_dev->name, tx_status);
			net_dev->stats.tx_errors++;
			if (tx_status & UNDERRUN)
				net_dev->stats.tx_fifo_errors++;
			if (tx_status & ABORT)
				net_dev->stats.tx_aborted_errors++;
			if (tx_status & NOCARRIER)
				net_dev->stats.tx_carrier_errors++;
			if (tx_status & OWCOLL)
				net_dev->stats.tx_window_errors++;
		} else {
			/* packet successfully transmitted */
			net_dev->stats.collisions += (tx_status & COLCNT) >> 16;
			net_dev->stats.tx_bytes += tx_status & DSIZE;
			net_dev->stats.tx_packets++;
		}
		/* Free the original skb. */
		skb = sis_priv->tx_skbuff[entry];
		pci_unmap_single(sis_priv->pci_dev,
			sis_priv->tx_ring[entry].bufptr, skb->len,
			PCI_DMA_TODEVICE);
		dev_kfree_skb_irq(skb);
		sis_priv->tx_skbuff[entry] = NULL;
		sis_priv->tx_ring[entry].bufptr = 0;
		sis_priv->tx_ring[entry].cmdsts = 0;
	}

	if (sis_priv->tx_full && netif_queue_stopped(net_dev) &&
	    sis_priv->cur_tx - sis_priv->dirty_tx < NUM_TX_DESC - 4) {
		/* The ring is no longer full, clear tx_full and schedule
		 * more transmission by netif_wake_queue(net_dev) */
		sis_priv->tx_full = 0;
		netif_wake_queue (net_dev);
	}
}

/**
 *	sis900_close - close sis900 device
 *	@net_dev: the net device to be closed
 *
 *	Disable interrupts, stop the Tx and Rx Status Machine
 *	free Tx and RX socket buffer
 */

static int sis900_close(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	struct pci_dev *pdev = sis_priv->pci_dev;
	void __iomem *ioaddr = sis_priv->ioaddr;
	struct sk_buff *skb;
	int i;

	netif_stop_queue(net_dev);

	/* Disable interrupts by clearing the interrupt mask. */
	sw32(imr, 0x0000);
	sw32(ier, 0x0000);

	/* Stop the chip's Tx and Rx Status Machine */
	sw32(cr, RxDIS | TxDIS | sr32(cr));

	del_timer(&sis_priv->timer);

	free_irq(pdev->irq, net_dev);

	/* Free Tx and RX skbuff */
	for (i = 0; i < NUM_RX_DESC; i++) {
		skb = sis_priv->rx_skbuff[i];
		if (skb) {
			pci_unmap_single(pdev, sis_priv->rx_ring[i].bufptr,
					 RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
			dev_kfree_skb(skb);
			sis_priv->rx_skbuff[i] = NULL;
		}
	}
	for (i = 0; i < NUM_TX_DESC; i++) {
		skb = sis_priv->tx_skbuff[i];
		if (skb) {
			pci_unmap_single(pdev, sis_priv->tx_ring[i].bufptr,
					 skb->len, PCI_DMA_TODEVICE);
			dev_kfree_skb(skb);
			sis_priv->tx_skbuff[i] = NULL;
		}
	}

	/* Green! Put the chip in low-power mode. */

	return 0;
}

/**
 *	sis900_get_drvinfo - Return information about driver
 *	@net_dev: the net device to probe
 *	@info: container for info returned
 *
 *	Process ethtool command such as "ehtool -i" to show information
 */

static void sis900_get_drvinfo(struct net_device *net_dev,
			       struct ethtool_drvinfo *info)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);

	strlcpy(info->driver, SIS900_MODULE_NAME, sizeof(info->driver));
	strlcpy(info->version, SIS900_DRV_VERSION, sizeof(info->version));
	strlcpy(info->bus_info, pci_name(sis_priv->pci_dev),
		sizeof(info->bus_info));
}

static u32 sis900_get_msglevel(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	return sis_priv->msg_enable;
}

static void sis900_set_msglevel(struct net_device *net_dev, u32 value)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	sis_priv->msg_enable = value;
}

static u32 sis900_get_link(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	return mii_link_ok(&sis_priv->mii_info);
}

static int sis900_get_settings(struct net_device *net_dev,
				struct ethtool_cmd *cmd)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	spin_lock_irq(&sis_priv->lock);
	mii_ethtool_gset(&sis_priv->mii_info, cmd);
	spin_unlock_irq(&sis_priv->lock);
	return 0;
}

static int sis900_set_settings(struct net_device *net_dev,
				struct ethtool_cmd *cmd)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	int rt;
	spin_lock_irq(&sis_priv->lock);
	rt = mii_ethtool_sset(&sis_priv->mii_info, cmd);
	spin_unlock_irq(&sis_priv->lock);
	return rt;
}

static int sis900_nway_reset(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	return mii_nway_restart(&sis_priv->mii_info);
}

/**
 *	sis900_set_wol - Set up Wake on Lan registers
 *	@net_dev: the net device to probe
 *	@wol: container for info passed to the driver
 *
 *	Process ethtool command "wol" to setup wake on lan features.
 *	SiS900 supports sending WoL events if a correct packet is received,
 *	but there is no simple way to filter them to only a subset (broadcast,
 *	multicast, unicast or arp).
 */

static int sis900_set_wol(struct net_device *net_dev, struct ethtool_wolinfo *wol)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	u32 cfgpmcsr = 0, pmctrl_bits = 0;

	if (wol->wolopts == 0) {
		pci_read_config_dword(sis_priv->pci_dev, CFGPMCSR, &cfgpmcsr);
		cfgpmcsr &= ~PME_EN;
		pci_write_config_dword(sis_priv->pci_dev, CFGPMCSR, cfgpmcsr);
		sw32(pmctrl, pmctrl_bits);
		if (netif_msg_wol(sis_priv))
			printk(KERN_DEBUG "%s: Wake on LAN disabled\n", net_dev->name);
		return 0;
	}

	if (wol->wolopts & (WAKE_MAGICSECURE | WAKE_UCAST | WAKE_MCAST
				| WAKE_BCAST | WAKE_ARP))
		return -EINVAL;

	if (wol->wolopts & WAKE_MAGIC)
		pmctrl_bits |= MAGICPKT;
	if (wol->wolopts & WAKE_PHY)
		pmctrl_bits |= LINKON;

	sw32(pmctrl, pmctrl_bits);

	pci_read_config_dword(sis_priv->pci_dev, CFGPMCSR, &cfgpmcsr);
	cfgpmcsr |= PME_EN;
	pci_write_config_dword(sis_priv->pci_dev, CFGPMCSR, cfgpmcsr);
	if (netif_msg_wol(sis_priv))
		printk(KERN_DEBUG "%s: Wake on LAN enabled\n", net_dev->name);

	return 0;
}

static void sis900_get_wol(struct net_device *net_dev, struct ethtool_wolinfo *wol)
{
	struct sis900_private *sp = netdev_priv(net_dev);
	void __iomem *ioaddr = sp->ioaddr;
	u32 pmctrl_bits;

	pmctrl_bits = sr32(pmctrl);
	if (pmctrl_bits & MAGICPKT)
		wol->wolopts |= WAKE_MAGIC;
	if (pmctrl_bits & LINKON)
		wol->wolopts |= WAKE_PHY;

	wol->supported = (WAKE_PHY | WAKE_MAGIC);
}

static const struct ethtool_ops sis900_ethtool_ops = {
	.get_drvinfo 	= sis900_get_drvinfo,
	.get_msglevel	= sis900_get_msglevel,
	.set_msglevel	= sis900_set_msglevel,
	.get_link	= sis900_get_link,
	.get_settings	= sis900_get_settings,
	.set_settings	= sis900_set_settings,
	.nway_reset	= sis900_nway_reset,
	.get_wol	= sis900_get_wol,
	.set_wol	= sis900_set_wol
};

/**
 *	mii_ioctl - process MII i/o control command
 *	@net_dev: the net device to command for
 *	@rq: parameter for command
 *	@cmd: the i/o command
 *
 *	Process MII command like read/write MII register
 */

static int mii_ioctl(struct net_device *net_dev, struct ifreq *rq, int cmd)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	struct mii_ioctl_data *data = if_mii(rq);

	switch(cmd) {
	case SIOCGMIIPHY:		/* Get address of MII PHY in use. */
		data->phy_id = sis_priv->mii->phy_addr;
		/* Fall Through */

	case SIOCGMIIREG:		/* Read MII PHY register. */
		data->val_out = mdio_read(net_dev, data->phy_id & 0x1f, data->reg_num & 0x1f);
		return 0;

	case SIOCSMIIREG:		/* Write MII PHY register. */
		mdio_write(net_dev, data->phy_id & 0x1f, data->reg_num & 0x1f, data->val_in);
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

/**
 *	sis900_set_config - Set media type by net_device.set_config
 *	@dev: the net device for media type change
 *	@map: ifmap passed by ifconfig
 *
 *	Set media type to 10baseT, 100baseT or 0(for auto) by ifconfig
 *	we support only port changes. All other runtime configuration
 *	changes will be ignored
 */

static int sis900_set_config(struct net_device *dev, struct ifmap *map)
{
	struct sis900_private *sis_priv = netdev_priv(dev);
	struct mii_phy *mii_phy = sis_priv->mii;

	u16 status;

	if ((map->port != (u_char)(-1)) && (map->port != dev->if_port)) {
		/* we switch on the ifmap->port field. I couldn't find anything
		 * like a definition or standard for the values of that field.
		 * I think the meaning of those values is device specific. But
		 * since I would like to change the media type via the ifconfig
		 * command I use the definition from linux/netdevice.h
		 * (which seems to be different from the ifport(pcmcia) definition) */
		switch(map->port){
		case IF_PORT_UNKNOWN: /* use auto here */
			dev->if_port = map->port;
			/* we are going to change the media type, so the Link
			 * will be temporary down and we need to reflect that
			 * here. When the Link comes up again, it will be
			 * sensed by the sis_timer procedure, which also does
			 * all the rest for us */
			netif_carrier_off(dev);

			/* read current state */
			status = mdio_read(dev, mii_phy->phy_addr, MII_CONTROL);

			/* enable auto negotiation and reset the negotioation
			 * (I don't really know what the auto negatiotiation
			 * reset really means, but it sounds for me right to
			 * do one here) */
			mdio_write(dev, mii_phy->phy_addr,
				   MII_CONTROL, status | MII_CNTL_AUTO | MII_CNTL_RST_AUTO);

			break;

		case IF_PORT_10BASET: /* 10BaseT */
			dev->if_port = map->port;

			/* we are going to change the media type, so the Link
			 * will be temporary down and we need to reflect that
			 * here. When the Link comes up again, it will be
			 * sensed by the sis_timer procedure, which also does
			 * all the rest for us */
			netif_carrier_off(dev);

			/* set Speed to 10Mbps */
			/* read current state */
			status = mdio_read(dev, mii_phy->phy_addr, MII_CONTROL);

			/* disable auto negotiation and force 10MBit mode*/
			mdio_write(dev, mii_phy->phy_addr,
				   MII_CONTROL, status & ~(MII_CNTL_SPEED |
					MII_CNTL_AUTO));
			break;

		case IF_PORT_100BASET: /* 100BaseT */
		case IF_PORT_100BASETX: /* 100BaseTx */
			dev->if_port = map->port;

			/* we are going to change the media type, so the Link
			 * will be temporary down and we need to reflect that
			 * here. When the Link comes up again, it will be
			 * sensed by the sis_timer procedure, which also does
			 * all the rest for us */
			netif_carrier_off(dev);

			/* set Speed to 100Mbps */
			/* disable auto negotiation and enable 100MBit Mode */
			status = mdio_read(dev, mii_phy->phy_addr, MII_CONTROL);
			mdio_write(dev, mii_phy->phy_addr,
				   MII_CONTROL, (status & ~MII_CNTL_SPEED) |
				   MII_CNTL_SPEED);

			break;

		case IF_PORT_10BASE2: /* 10Base2 */
		case IF_PORT_AUI: /* AUI */
		case IF_PORT_100BASEFX: /* 100BaseFx */
                	/* These Modes are not supported (are they?)*/
			return -EOPNOTSUPP;
			break;

		default:
			return -EINVAL;
		}
	}
	return 0;
}

/**
 *	sis900_mcast_bitnr - compute hashtable index
 *	@addr: multicast address
 *	@revision: revision id of chip
 *
 *	SiS 900 uses the most sigificant 7 bits to index a 128 bits multicast
 *	hash table, which makes this function a little bit different from other drivers
 *	SiS 900 B0 & 635 M/B uses the most significat 8 bits to index 256 bits
 *   	multicast hash table.
 */

static inline u16 sis900_mcast_bitnr(u8 *addr, u8 revision)
{

	u32 crc = ether_crc(6, addr);

	/* leave 8 or 7 most siginifant bits */
	if ((revision >= SIS635A_900_REV) || (revision == SIS900B_900_REV))
		return (int)(crc >> 24);
	else
		return (int)(crc >> 25);
}

/**
 *	set_rx_mode - Set SiS900 receive mode
 *	@net_dev: the net device to be set
 *
 *	Set SiS900 receive mode for promiscuous, multicast, or broadcast mode.
 *	And set the appropriate multicast filter.
 *	Multicast hash table changes from 128 to 256 bits for 635M/B & 900B0.
 */

static void set_rx_mode(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	u16 mc_filter[16] = {0};	/* 256/128 bits multicast hash table */
	int i, table_entries;
	u32 rx_mode;

	/* 635 Hash Table entries = 256(2^16) */
	if((sis_priv->chipset_rev >= SIS635A_900_REV) ||
			(sis_priv->chipset_rev == SIS900B_900_REV))
		table_entries = 16;
	else
		table_entries = 8;

	if (net_dev->flags & IFF_PROMISC) {
		/* Accept any kinds of packets */
		rx_mode = RFPromiscuous;
		for (i = 0; i < table_entries; i++)
			mc_filter[i] = 0xffff;
	} else if ((netdev_mc_count(net_dev) > multicast_filter_limit) ||
		   (net_dev->flags & IFF_ALLMULTI)) {
		/* too many multicast addresses or accept all multicast packet */
		rx_mode = RFAAB | RFAAM;
		for (i = 0; i < table_entries; i++)
			mc_filter[i] = 0xffff;
	} else {
		/* Accept Broadcast packet, destination address matchs our
		 * MAC address, use Receive Filter to reject unwanted MCAST
		 * packets */
		struct netdev_hw_addr *ha;
		rx_mode = RFAAB;

		netdev_for_each_mc_addr(ha, net_dev) {
			unsigned int bit_nr;

			bit_nr = sis900_mcast_bitnr(ha->addr,
						    sis_priv->chipset_rev);
			mc_filter[bit_nr >> 4] |= (1 << (bit_nr & 0xf));
		}
	}

	/* update Multicast Hash Table in Receive Filter */
	for (i = 0; i < table_entries; i++) {
                /* why plus 0x04 ??, That makes the correct value for hash table. */
		sw32(rfcr, (u32)(0x00000004 + i) << RFADDR_shift);
		sw32(rfdr, mc_filter[i]);
	}

	sw32(rfcr, RFEN | rx_mode);

	/* sis900 is capable of looping back packets at MAC level for
	 * debugging purpose */
	if (net_dev->flags & IFF_LOOPBACK) {
		u32 cr_saved;
		/* We must disable Tx/Rx before setting loopback mode */
		cr_saved = sr32(cr);
		sw32(cr, cr_saved | TxDIS | RxDIS);
		/* enable loopback */
		sw32(txcfg, sr32(txcfg) | TxMLB);
		sw32(rxcfg, sr32(rxcfg) | RxATX);
		/* restore cr */
		sw32(cr, cr_saved);
	}
}

/**
 *	sis900_reset - Reset sis900 MAC
 *	@net_dev: the net device to reset
 *
 *	reset sis900 MAC and wait until finished
 *	reset through command register
 *	change backoff algorithm for 900B0 & 635 M/B
 */

static void sis900_reset(struct net_device *net_dev)
{
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;
	u32 status = TxRCMP | RxRCMP;
	int i;

	sw32(ier, 0);
	sw32(imr, 0);
	sw32(rfcr, 0);

	sw32(cr, RxRESET | TxRESET | RESET | sr32(cr));

	/* Check that the chip has finished the reset. */
	for (i = 0; status && (i < 1000); i++)
		status ^= sr32(isr) & status;

	if (sis_priv->chipset_rev >= SIS635A_900_REV ||
	    sis_priv->chipset_rev == SIS900B_900_REV)
		sw32(cfg, PESEL | RND_CNT);
	else
		sw32(cfg, PESEL);
}

/**
 *	sis900_remove - Remove sis900 device
 *	@pci_dev: the pci device to be removed
 *
 *	remove and release SiS900 net device
 */

static void sis900_remove(struct pci_dev *pci_dev)
{
	struct net_device *net_dev = pci_get_drvdata(pci_dev);
	struct sis900_private *sis_priv = netdev_priv(net_dev);

	unregister_netdev(net_dev);

	while (sis_priv->first_mii) {
		struct mii_phy *phy = sis_priv->first_mii;

		sis_priv->first_mii = phy->next;
		kfree(phy);
	}

	pci_free_consistent(pci_dev, RX_TOTAL_SIZE, sis_priv->rx_ring,
		sis_priv->rx_ring_dma);
	pci_free_consistent(pci_dev, TX_TOTAL_SIZE, sis_priv->tx_ring,
		sis_priv->tx_ring_dma);
	pci_iounmap(pci_dev, sis_priv->ioaddr);
	free_netdev(net_dev);
	pci_release_regions(pci_dev);
	pci_set_drvdata(pci_dev, NULL);
}

#ifdef CONFIG_PM

static int sis900_suspend(struct pci_dev *pci_dev, pm_message_t state)
{
	struct net_device *net_dev = pci_get_drvdata(pci_dev);
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;

	if(!netif_running(net_dev))
		return 0;

	netif_stop_queue(net_dev);
	netif_device_detach(net_dev);

	/* Stop the chip's Tx and Rx Status Machine */
	sw32(cr, RxDIS | TxDIS | sr32(cr));

	pci_set_power_state(pci_dev, PCI_D3hot);
	pci_save_state(pci_dev);

	return 0;
}

static int sis900_resume(struct pci_dev *pci_dev)
{
	struct net_device *net_dev = pci_get_drvdata(pci_dev);
	struct sis900_private *sis_priv = netdev_priv(net_dev);
	void __iomem *ioaddr = sis_priv->ioaddr;

	if(!netif_running(net_dev))
		return 0;
	pci_restore_state(pci_dev);
	pci_set_power_state(pci_dev, PCI_D0);

	sis900_init_rxfilter(net_dev);

	sis900_init_tx_ring(net_dev);
	sis900_init_rx_ring(net_dev);

	set_rx_mode(net_dev);

	netif_device_attach(net_dev);
	netif_start_queue(net_dev);

	/* Workaround for EDB */
	sis900_set_mode(sis_priv, HW_SPEED_10_MBPS, FDX_CAPABLE_HALF_SELECTED);

	/* Enable all known interrupts by setting the interrupt mask. */
	sw32(imr, RxSOVR | RxORN | RxERR | RxOK | TxURN | TxERR | TxIDLE);
	sw32(cr, RxENA | sr32(cr));
	sw32(ier, IE);

	sis900_check_mode(net_dev, sis_priv->mii);

	return 0;
}
#endif /* CONFIG_PM */

static struct pci_driver sis900_pci_driver = {
	.name		= SIS900_MODULE_NAME,
	.id_table	= sis900_pci_tbl,
	.probe		= sis900_probe,
	.remove		= sis900_remove,
#ifdef CONFIG_PM
	.suspend	= sis900_suspend,
	.resume		= sis900_resume,
#endif /* CONFIG_PM */
};

static int __init sis900_init_module(void)
{
/* when a module, this is printed whether or not devices are found in probe */
#ifdef MODULE
	printk(version);
#endif

	return pci_register_driver(&sis900_pci_driver);
}

static void __exit sis900_cleanup_module(void)
{
	pci_unregister_driver(&sis900_pci_driver);
}

module_init(sis900_init_module);
module_exit(sis900_cleanup_module);