summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/cirrus/cs89x0.c
blob: c9aebcde403a536096244688761433b76d03bd88 (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
/* cs89x0.c: A Crystal Semiconductor (Now Cirrus Logic) CS89[02]0
 *           driver for linux.
 * Written 1996 by Russell Nelson, with reference to skeleton.c
 * written 1993-1994 by Donald Becker.
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * The author may be reached at nelson@crynwr.com, Crynwr
 * Software, 521 Pleasant Valley Rd., Potsdam, NY 13676
 *
 * Other contributors:
 * Mike Cruse        : mcruse@cti-ltd.com
 * Russ Nelson
 * Melody Lee        : ethernet@crystal.cirrus.com
 * Alan Cox
 * Andrew Morton
 * Oskar Schirmer    : oskar@scara.com
 * Deepak Saxena     : dsaxena@plexity.net
 * Dmitry Pervushin  : dpervushin@ru.mvista.com
 * Deepak Saxena     : dsaxena@plexity.net
 * Domenico Andreoli : cavokz@gmail.com
 */


/*
 * Set this to zero to disable DMA code
 *
 * Note that even if DMA is turned off we still support the 'dma' and  'use_dma'
 * module options so we don't break any startup scripts.
 */
#ifndef CONFIG_ISA_DMA_API
#define ALLOW_DMA	0
#else
#define ALLOW_DMA	1
#endif

/*
 * Set this to zero to remove all the debug statements via
 * dead code elimination
 */
#define DEBUGGING	1

/* Sources:
 *	Crynwr packet driver epktisa.
 *	Crystal Semiconductor data sheets.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/printk.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/jiffies.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/io.h>

#include <asm/irq.h>
#include <linux/atomic.h>
#if ALLOW_DMA
#include <asm/dma.h>
#endif

#include "cs89x0.h"

#define cs89_dbg(val, level, fmt, ...)				\
do {								\
	if (val <= net_debug)					\
		pr_##level(fmt, ##__VA_ARGS__);			\
} while (0)

static char version[] __initdata =
	"v2.4.3-pre1 Russell Nelson <nelson@crynwr.com>, Andrew Morton";

#define DRV_NAME "cs89x0"

/* First, a few definitions that the brave might change.
 * A zero-terminated list of I/O addresses to be probed. Some special flags..
 * Addr & 1 = Read back the address port, look for signature and reset
 * the page window before probing
 * Addr & 3 = Reset the page window and probe
 * The CLPS eval board has the Cirrus chip at 0x80090300, in ARM IO space,
 * but it is possible that a Cirrus board could be plugged into the ISA
 * slots.
 */
/* The cs8900 has 4 IRQ pins, software selectable. cs8900_irq_map maps
 * them to system IRQ numbers. This mapping is card specific and is set to
 * the configuration of the Cirrus Eval board for this chip.
 */
#ifndef CONFIG_CS89x0_PLATFORM
static unsigned int netcard_portlist[] __used __initdata = {
	0x300, 0x320, 0x340, 0x360, 0x200, 0x220, 0x240,
	0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0
};
static unsigned int cs8900_irq_map[] = {
	10, 11, 12, 5
};
#endif

#if DEBUGGING
static unsigned int net_debug = DEBUGGING;
#else
#define net_debug 0	/* gcc will remove all the debug code for us */
#endif

/* The number of low I/O ports used by the ethercard. */
#define NETCARD_IO_EXTENT	16

/* we allow the user to override various values normally set in the EEPROM */
#define FORCE_RJ45	0x0001    /* pick one of these three */
#define FORCE_AUI	0x0002
#define FORCE_BNC	0x0004

#define FORCE_AUTO	0x0010    /* pick one of these three */
#define FORCE_HALF	0x0020
#define FORCE_FULL	0x0030

/* Information that need to be kept for each board. */
struct net_local {
	int chip_type;		/* one of: CS8900, CS8920, CS8920M */
	char chip_revision;	/* revision letter of the chip ('A'...) */
	int send_cmd;		/* the proper send command: TX_NOW, TX_AFTER_381, or TX_AFTER_ALL */
	int auto_neg_cnf;	/* auto-negotiation word from EEPROM */
	int adapter_cnf;	/* adapter configuration from EEPROM */
	int isa_config;		/* ISA configuration from EEPROM */
	int irq_map;		/* IRQ map from EEPROM */
	int rx_mode;		/* what mode are we in? 0, RX_MULTCAST_ACCEPT, or RX_ALL_ACCEPT */
	int curr_rx_cfg;	/* a copy of PP_RxCFG */
	int linectl;		/* either 0 or LOW_RX_SQUELCH, depending on configuration. */
	int send_underrun;	/* keep track of how many underruns in a row we get */
	int force;		/* force various values; see FORCE* above. */
	spinlock_t lock;
	void __iomem *virt_addr;/* CS89x0 virtual address. */
#if ALLOW_DMA
	int use_dma;		/* Flag: we're using dma */
	int dma;		/* DMA channel */
	int dmasize;		/* 16 or 64 */
	unsigned char *dma_buff;	/* points to the beginning of the buffer */
	unsigned char *end_dma_buff;	/* points to the end of the buffer */
	unsigned char *rx_dma_ptr;	/* points to the next packet  */
#endif
};

/* Example routines you must write ;->. */
#define tx_done(dev) 1

/*
 * Permit 'cs89x0_dma=N' in the kernel boot environment
 */
#if !defined(MODULE)
#if ALLOW_DMA
static int g_cs89x0_dma;

static int __init dma_fn(char *str)
{
	g_cs89x0_dma = simple_strtol(str, NULL, 0);
	return 1;
}

__setup("cs89x0_dma=", dma_fn);
#endif	/* ALLOW_DMA */

static int g_cs89x0_media__force;

static int __init media_fn(char *str)
{
	if (!strcmp(str, "rj45"))
		g_cs89x0_media__force = FORCE_RJ45;
	else if (!strcmp(str, "aui"))
		g_cs89x0_media__force = FORCE_AUI;
	else if (!strcmp(str, "bnc"))
		g_cs89x0_media__force = FORCE_BNC;

	return 1;
}

__setup("cs89x0_media=", media_fn);
#endif

static void readwords(struct net_local *lp, int portno, void *buf, int length)
{
	u8 *buf8 = (u8 *)buf;

	do {
		u16 tmp16;

		tmp16 = ioread16(lp->virt_addr + portno);
		*buf8++ = (u8)tmp16;
		*buf8++ = (u8)(tmp16 >> 8);
	} while (--length);
}

static void writewords(struct net_local *lp, int portno, void *buf, int length)
{
	u8 *buf8 = (u8 *)buf;

	do {
		u16 tmp16;

		tmp16 = *buf8++;
		tmp16 |= (*buf8++) << 8;
		iowrite16(tmp16, lp->virt_addr + portno);
	} while (--length);
}

static u16
readreg(struct net_device *dev, u16 regno)
{
	struct net_local *lp = netdev_priv(dev);

	iowrite16(regno, lp->virt_addr + ADD_PORT);
	return ioread16(lp->virt_addr + DATA_PORT);
}

static void
writereg(struct net_device *dev, u16 regno, u16 value)
{
	struct net_local *lp = netdev_priv(dev);

	iowrite16(regno, lp->virt_addr + ADD_PORT);
	iowrite16(value, lp->virt_addr + DATA_PORT);
}

static int __init
wait_eeprom_ready(struct net_device *dev)
{
	unsigned long timeout = jiffies;
	/* check to see if the EEPROM is ready,
	 * a timeout is used just in case EEPROM is ready when
	 * SI_BUSY in the PP_SelfST is clear
	 */
	while (readreg(dev, PP_SelfST) & SI_BUSY)
		if (time_after_eq(jiffies, timeout + 40))
			return -1;
	return 0;
}

static int __init
get_eeprom_data(struct net_device *dev, int off, int len, int *buffer)
{
	int i;

	cs89_dbg(3, info, "EEPROM data from %x for %x:", off, len);
	for (i = 0; i < len; i++) {
		if (wait_eeprom_ready(dev) < 0)
			return -1;
		/* Now send the EEPROM read command and EEPROM location to read */
		writereg(dev, PP_EECMD, (off + i) | EEPROM_READ_CMD);
		if (wait_eeprom_ready(dev) < 0)
			return -1;
		buffer[i] = readreg(dev, PP_EEData);
		cs89_dbg(3, cont, " %04x", buffer[i]);
	}
	cs89_dbg(3, cont, "\n");
	return 0;
}

static int  __init
get_eeprom_cksum(int off, int len, int *buffer)
{
	int i, cksum;

	cksum = 0;
	for (i = 0; i < len; i++)
		cksum += buffer[i];
	cksum &= 0xffff;
	if (cksum == 0)
		return 0;
	return -1;
}

static void
write_irq(struct net_device *dev, int chip_type, int irq)
{
	int i;

	if (chip_type == CS8900) {
#ifndef CONFIG_CS89x0_PLATFORM
		/* Search the mapping table for the corresponding IRQ pin. */
		for (i = 0; i != ARRAY_SIZE(cs8900_irq_map); i++)
			if (cs8900_irq_map[i] == irq)
				break;
		/* Not found */
		if (i == ARRAY_SIZE(cs8900_irq_map))
			i = 3;
#else
		/* INTRQ0 pin is used for interrupt generation. */
		i = 0;
#endif
		writereg(dev, PP_CS8900_ISAINT, i);
	} else {
		writereg(dev, PP_CS8920_ISAINT, irq);
	}
}

static void
count_rx_errors(int status, struct net_device *dev)
{
	dev->stats.rx_errors++;
	if (status & RX_RUNT)
		dev->stats.rx_length_errors++;
	if (status & RX_EXTRA_DATA)
		dev->stats.rx_length_errors++;
	if ((status & RX_CRC_ERROR) && !(status & (RX_EXTRA_DATA | RX_RUNT)))
		/* per str 172 */
		dev->stats.rx_crc_errors++;
	if (status & RX_DRIBBLE)
		dev->stats.rx_frame_errors++;
}

/*********************************
 * This page contains DMA routines
 *********************************/

#if ALLOW_DMA

#define dma_page_eq(ptr1, ptr2) ((long)(ptr1) >> 17 == (long)(ptr2) >> 17)

static void
get_dma_channel(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);

	if (lp->dma) {
		dev->dma = lp->dma;
		lp->isa_config |= ISA_RxDMA;
	} else {
		if ((lp->isa_config & ANY_ISA_DMA) == 0)
			return;
		dev->dma = lp->isa_config & DMA_NO_MASK;
		if (lp->chip_type == CS8900)
			dev->dma += 5;
		if (dev->dma < 5 || dev->dma > 7) {
			lp->isa_config &= ~ANY_ISA_DMA;
			return;
		}
	}
}

static void
write_dma(struct net_device *dev, int chip_type, int dma)
{
	struct net_local *lp = netdev_priv(dev);
	if ((lp->isa_config & ANY_ISA_DMA) == 0)
		return;
	if (chip_type == CS8900)
		writereg(dev, PP_CS8900_ISADMA, dma - 5);
	else
		writereg(dev, PP_CS8920_ISADMA, dma);
}

static void
set_dma_cfg(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);

	if (lp->use_dma) {
		if ((lp->isa_config & ANY_ISA_DMA) == 0) {
			cs89_dbg(3, err, "set_dma_cfg(): no DMA\n");
			return;
		}
		if (lp->isa_config & ISA_RxDMA) {
			lp->curr_rx_cfg |= RX_DMA_ONLY;
			cs89_dbg(3, info, "set_dma_cfg(): RX_DMA_ONLY\n");
		} else {
			lp->curr_rx_cfg |= AUTO_RX_DMA;	/* not that we support it... */
			cs89_dbg(3, info, "set_dma_cfg(): AUTO_RX_DMA\n");
		}
	}
}

static int
dma_bufcfg(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	if (lp->use_dma)
		return (lp->isa_config & ANY_ISA_DMA) ? RX_DMA_ENBL : 0;
	else
		return 0;
}

static int
dma_busctl(struct net_device *dev)
{
	int retval = 0;
	struct net_local *lp = netdev_priv(dev);
	if (lp->use_dma) {
		if (lp->isa_config & ANY_ISA_DMA)
			retval |= RESET_RX_DMA; /* Reset the DMA pointer */
		if (lp->isa_config & DMA_BURST)
			retval |= DMA_BURST_MODE; /* Does ISA config specify DMA burst ? */
		if (lp->dmasize == 64)
			retval |= RX_DMA_SIZE_64K; /* did they ask for 64K? */
		retval |= MEMORY_ON;	/* we need memory enabled to use DMA. */
	}
	return retval;
}

static void
dma_rx(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	struct sk_buff *skb;
	int status, length;
	unsigned char *bp = lp->rx_dma_ptr;

	status = bp[0] + (bp[1] << 8);
	length = bp[2] + (bp[3] << 8);
	bp += 4;

	cs89_dbg(5, debug, "%s: receiving DMA packet at %lx, status %x, length %x\n",
		 dev->name, (unsigned long)bp, status, length);

	if ((status & RX_OK) == 0) {
		count_rx_errors(status, dev);
		goto skip_this_frame;
	}

	/* Malloc up new buffer. */
	skb = netdev_alloc_skb(dev, length + 2);
	if (skb == NULL) {
		dev->stats.rx_dropped++;

		/* AKPM: advance bp to the next frame */
skip_this_frame:
		bp += (length + 3) & ~3;
		if (bp >= lp->end_dma_buff)
			bp -= lp->dmasize * 1024;
		lp->rx_dma_ptr = bp;
		return;
	}
	skb_reserve(skb, 2);	/* longword align L3 header */

	if (bp + length > lp->end_dma_buff) {
		int semi_cnt = lp->end_dma_buff - bp;
		skb_put_data(skb, bp, semi_cnt);
		skb_put_data(skb, lp->dma_buff, length - semi_cnt);
	} else {
		skb_put_data(skb, bp, length);
	}
	bp += (length + 3) & ~3;
	if (bp >= lp->end_dma_buff)
		bp -= lp->dmasize*1024;
	lp->rx_dma_ptr = bp;

	cs89_dbg(3, info, "%s: received %d byte DMA packet of type %x\n",
		 dev->name, length,
		 ((skb->data[ETH_ALEN + ETH_ALEN] << 8) |
		  skb->data[ETH_ALEN + ETH_ALEN + 1]));

	skb->protocol = eth_type_trans(skb, dev);
	netif_rx(skb);
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += length;
}

static void release_dma_buff(struct net_local *lp)
{
	if (lp->dma_buff) {
		free_pages((unsigned long)(lp->dma_buff),
			   get_order(lp->dmasize * 1024));
		lp->dma_buff = NULL;
	}
}

#endif	/* ALLOW_DMA */

static void
control_dc_dc(struct net_device *dev, int on_not_off)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned int selfcontrol;
	unsigned long timenow = jiffies;
	/* control the DC to DC convertor in the SelfControl register.
	 * Note: This is hooked up to a general purpose pin, might not
	 * always be a DC to DC convertor.
	 */

	selfcontrol = HCB1_ENBL; /* Enable the HCB1 bit as an output */
	if (((lp->adapter_cnf & A_CNF_DC_DC_POLARITY) != 0) ^ on_not_off)
		selfcontrol |= HCB1;
	else
		selfcontrol &= ~HCB1;
	writereg(dev, PP_SelfCTL, selfcontrol);

	/* Wait for the DC/DC converter to power up - 500ms */
	while (time_before(jiffies, timenow + HZ))
		;
}

/* send a test packet - return true if carrier bits are ok */
static int
send_test_pkt(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	char test_packet[] = {
		0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0,
		0, 46,		/* A 46 in network order */
		0, 0,		/* DSAP=0 & SSAP=0 fields */
		0xf3, 0		/* Control (Test Req + P bit set) */
	};
	unsigned long timenow = jiffies;

	writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_TX_ON);

	memcpy(test_packet,            dev->dev_addr, ETH_ALEN);
	memcpy(test_packet + ETH_ALEN, dev->dev_addr, ETH_ALEN);

	iowrite16(TX_AFTER_ALL, lp->virt_addr + TX_CMD_PORT);
	iowrite16(ETH_ZLEN, lp->virt_addr + TX_LEN_PORT);

	/* Test to see if the chip has allocated memory for the packet */
	while (time_before(jiffies, timenow + 5))
		if (readreg(dev, PP_BusST) & READY_FOR_TX_NOW)
			break;
	if (time_after_eq(jiffies, timenow + 5))
		return 0;	/* this shouldn't happen */

	/* Write the contents of the packet */
	writewords(lp, TX_FRAME_PORT, test_packet, (ETH_ZLEN + 1) >> 1);

	cs89_dbg(1, debug, "Sending test packet ");
	/* wait a couple of jiffies for packet to be received */
	for (timenow = jiffies; time_before(jiffies, timenow + 3);)
		;
	if ((readreg(dev, PP_TxEvent) & TX_SEND_OK_BITS) == TX_OK) {
		cs89_dbg(1, cont, "succeeded\n");
		return 1;
	}
	cs89_dbg(1, cont, "failed\n");
	return 0;
}

#define DETECTED_NONE  0
#define DETECTED_RJ45H 1
#define DETECTED_RJ45F 2
#define DETECTED_AUI   3
#define DETECTED_BNC   4

static int
detect_tp(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned long timenow = jiffies;
	int fdx;

	cs89_dbg(1, debug, "%s: Attempting TP\n", dev->name);

	/* If connected to another full duplex capable 10-Base-T card
	 * the link pulses seem to be lost when the auto detect bit in
	 * the LineCTL is set.  To overcome this the auto detect bit will
	 * be cleared whilst testing the 10-Base-T interface.  This would
	 * not be necessary for the sparrow chip but is simpler to do it
	 * anyway.
	 */
	writereg(dev, PP_LineCTL, lp->linectl & ~AUI_ONLY);
	control_dc_dc(dev, 0);

	/* Delay for the hardware to work out if the TP cable is present
	 * - 150ms
	 */
	for (timenow = jiffies; time_before(jiffies, timenow + 15);)
		;
	if ((readreg(dev, PP_LineST) & LINK_OK) == 0)
		return DETECTED_NONE;

	if (lp->chip_type == CS8900) {
		switch (lp->force & 0xf0) {
#if 0
		case FORCE_AUTO:
			pr_info("%s: cs8900 doesn't autonegotiate\n",
				dev->name);
			return DETECTED_NONE;
#endif
			/* CS8900 doesn't support AUTO, change to HALF*/
		case FORCE_AUTO:
			lp->force &= ~FORCE_AUTO;
			lp->force |= FORCE_HALF;
			break;
		case FORCE_HALF:
			break;
		case FORCE_FULL:
			writereg(dev, PP_TestCTL,
				 readreg(dev, PP_TestCTL) | FDX_8900);
			break;
		}
		fdx = readreg(dev, PP_TestCTL) & FDX_8900;
	} else {
		switch (lp->force & 0xf0) {
		case FORCE_AUTO:
			lp->auto_neg_cnf = AUTO_NEG_ENABLE;
			break;
		case FORCE_HALF:
			lp->auto_neg_cnf = 0;
			break;
		case FORCE_FULL:
			lp->auto_neg_cnf = RE_NEG_NOW | ALLOW_FDX;
			break;
		}

		writereg(dev, PP_AutoNegCTL, lp->auto_neg_cnf & AUTO_NEG_MASK);

		if ((lp->auto_neg_cnf & AUTO_NEG_BITS) == AUTO_NEG_ENABLE) {
			pr_info("%s: negotiating duplex...\n", dev->name);
			while (readreg(dev, PP_AutoNegST) & AUTO_NEG_BUSY) {
				if (time_after(jiffies, timenow + 4000)) {
					pr_err("**** Full / half duplex auto-negotiation timed out ****\n");
					break;
				}
			}
		}
		fdx = readreg(dev, PP_AutoNegST) & FDX_ACTIVE;
	}
	if (fdx)
		return DETECTED_RJ45F;
	else
		return DETECTED_RJ45H;
}

static int
detect_bnc(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);

	cs89_dbg(1, debug, "%s: Attempting BNC\n", dev->name);
	control_dc_dc(dev, 1);

	writereg(dev, PP_LineCTL, (lp->linectl & ~AUTO_AUI_10BASET) | AUI_ONLY);

	if (send_test_pkt(dev))
		return DETECTED_BNC;
	else
		return DETECTED_NONE;
}

static int
detect_aui(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);

	cs89_dbg(1, debug, "%s: Attempting AUI\n", dev->name);
	control_dc_dc(dev, 0);

	writereg(dev, PP_LineCTL, (lp->linectl & ~AUTO_AUI_10BASET) | AUI_ONLY);

	if (send_test_pkt(dev))
		return DETECTED_AUI;
	else
		return DETECTED_NONE;
}

/* We have a good packet(s), get it/them out of the buffers. */
static void
net_rx(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	struct sk_buff *skb;
	int status, length;

	status = ioread16(lp->virt_addr + RX_FRAME_PORT);
	length = ioread16(lp->virt_addr + RX_FRAME_PORT);

	if ((status & RX_OK) == 0) {
		count_rx_errors(status, dev);
		return;
	}

	/* Malloc up new buffer. */
	skb = netdev_alloc_skb(dev, length + 2);
	if (skb == NULL) {
		dev->stats.rx_dropped++;
		return;
	}
	skb_reserve(skb, 2);	/* longword align L3 header */

	readwords(lp, RX_FRAME_PORT, skb_put(skb, length), length >> 1);
	if (length & 1)
		skb->data[length-1] = ioread16(lp->virt_addr + RX_FRAME_PORT);

	cs89_dbg(3, debug, "%s: received %d byte packet of type %x\n",
		 dev->name, length,
		 (skb->data[ETH_ALEN + ETH_ALEN] << 8) |
		 skb->data[ETH_ALEN + ETH_ALEN + 1]);

	skb->protocol = eth_type_trans(skb, dev);
	netif_rx(skb);
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += length;
}

/* The typical workload of the driver:
 * Handle the network interface interrupts.
 */

static irqreturn_t net_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct net_local *lp;
	int status;
	int handled = 0;

	lp = netdev_priv(dev);

	/* we MUST read all the events out of the ISQ, otherwise we'll never
	 * get interrupted again.  As a consequence, we can't have any limit
	 * on the number of times we loop in the interrupt handler.  The
	 * hardware guarantees that eventually we'll run out of events.  Of
	 * course, if you're on a slow machine, and packets are arriving
	 * faster than you can read them off, you're screwed.  Hasta la
	 * vista, baby!
	 */
	while ((status = ioread16(lp->virt_addr + ISQ_PORT))) {
		cs89_dbg(4, debug, "%s: event=%04x\n", dev->name, status);
		handled = 1;
		switch (status & ISQ_EVENT_MASK) {
		case ISQ_RECEIVER_EVENT:
			/* Got a packet(s). */
			net_rx(dev);
			break;
		case ISQ_TRANSMITTER_EVENT:
			dev->stats.tx_packets++;
			netif_wake_queue(dev);	/* Inform upper layers. */
			if ((status & (TX_OK |
				       TX_LOST_CRS |
				       TX_SQE_ERROR |
				       TX_LATE_COL |
				       TX_16_COL)) != TX_OK) {
				if ((status & TX_OK) == 0)
					dev->stats.tx_errors++;
				if (status & TX_LOST_CRS)
					dev->stats.tx_carrier_errors++;
				if (status & TX_SQE_ERROR)
					dev->stats.tx_heartbeat_errors++;
				if (status & TX_LATE_COL)
					dev->stats.tx_window_errors++;
				if (status & TX_16_COL)
					dev->stats.tx_aborted_errors++;
			}
			break;
		case ISQ_BUFFER_EVENT:
			if (status & READY_FOR_TX) {
				/* we tried to transmit a packet earlier,
				 * but inexplicably ran out of buffers.
				 * That shouldn't happen since we only ever
				 * load one packet.  Shrug.  Do the right
				 * thing anyway.
				 */
				netif_wake_queue(dev);	/* Inform upper layers. */
			}
			if (status & TX_UNDERRUN) {
				cs89_dbg(0, err, "%s: transmit underrun\n",
					 dev->name);
				lp->send_underrun++;
				if (lp->send_underrun == 3)
					lp->send_cmd = TX_AFTER_381;
				else if (lp->send_underrun == 6)
					lp->send_cmd = TX_AFTER_ALL;
				/* transmit cycle is done, although
				 * frame wasn't transmitted - this
				 * avoids having to wait for the upper
				 * layers to timeout on us, in the
				 * event of a tx underrun
				 */
				netif_wake_queue(dev);	/* Inform upper layers. */
			}
#if ALLOW_DMA
			if (lp->use_dma && (status & RX_DMA)) {
				int count = readreg(dev, PP_DmaFrameCnt);
				while (count) {
					cs89_dbg(5, debug,
						 "%s: receiving %d DMA frames\n",
						 dev->name, count);
					if (count > 1)
						cs89_dbg(2, debug,
							 "%s: receiving %d DMA frames\n",
							 dev->name, count);
					dma_rx(dev);
					if (--count == 0)
						count = readreg(dev, PP_DmaFrameCnt);
					if (count > 0)
						cs89_dbg(2, debug,
							 "%s: continuing with %d DMA frames\n",
							 dev->name, count);
				}
			}
#endif
			break;
		case ISQ_RX_MISS_EVENT:
			dev->stats.rx_missed_errors += (status >> 6);
			break;
		case ISQ_TX_COL_EVENT:
			dev->stats.collisions += (status >> 6);
			break;
		}
	}
	return IRQ_RETVAL(handled);
}

/* Open/initialize the board.  This is called (in the current kernel)
   sometime after booting when the 'ifconfig' program is run.

   This routine should set everything up anew at each open, even
   registers that "should" only need to be set once at boot, so that
   there is non-reboot way to recover if something goes wrong.
*/

/* AKPM: do we need to do any locking here? */

static int
net_open(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	int result = 0;
	int i;
	int ret;

	if (dev->irq < 2) {
		/* Allow interrupts to be generated by the chip */
/* Cirrus' release had this: */
#if 0
		writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
#endif
/* And 2.3.47 had this: */
		writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);

		for (i = 2; i < CS8920_NO_INTS; i++) {
			if ((1 << i) & lp->irq_map) {
				if (request_irq(i, net_interrupt, 0, dev->name,
						dev) == 0) {
					dev->irq = i;
					write_irq(dev, lp->chip_type, i);
					/* writereg(dev, PP_BufCFG, GENERATE_SW_INTERRUPT); */
					break;
				}
			}
		}

		if (i >= CS8920_NO_INTS) {
			writereg(dev, PP_BusCTL, 0);	/* disable interrupts. */
			pr_err("can't get an interrupt\n");
			ret = -EAGAIN;
			goto bad_out;
		}
	} else {
#if !defined(CONFIG_CS89x0_PLATFORM)
		if (((1 << dev->irq) & lp->irq_map) == 0) {
			pr_err("%s: IRQ %d is not in our map of allowable IRQs, which is %x\n",
			       dev->name, dev->irq, lp->irq_map);
			ret = -EAGAIN;
			goto bad_out;
		}
#endif
/* FIXME: Cirrus' release had this: */
		writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL)|ENABLE_IRQ);
/* And 2.3.47 had this: */
#if 0
		writereg(dev, PP_BusCTL, ENABLE_IRQ | MEMORY_ON);
#endif
		write_irq(dev, lp->chip_type, dev->irq);
		ret = request_irq(dev->irq, net_interrupt, 0, dev->name, dev);
		if (ret) {
			pr_err("request_irq(%d) failed\n", dev->irq);
			goto bad_out;
		}
	}

#if ALLOW_DMA
	if (lp->use_dma && (lp->isa_config & ANY_ISA_DMA)) {
		unsigned long flags;
		lp->dma_buff = (unsigned char *)__get_dma_pages(GFP_KERNEL,
								get_order(lp->dmasize * 1024));
		if (!lp->dma_buff) {
			pr_err("%s: cannot get %dK memory for DMA\n",
			       dev->name, lp->dmasize);
			goto release_irq;
		}
		cs89_dbg(1, debug, "%s: dma %lx %lx\n",
			 dev->name,
			 (unsigned long)lp->dma_buff,
			 (unsigned long)isa_virt_to_bus(lp->dma_buff));
		if ((unsigned long)lp->dma_buff >= MAX_DMA_ADDRESS ||
		    !dma_page_eq(lp->dma_buff,
				 lp->dma_buff + lp->dmasize * 1024 - 1)) {
			pr_err("%s: not usable as DMA buffer\n", dev->name);
			goto release_irq;
		}
		memset(lp->dma_buff, 0, lp->dmasize * 1024);	/* Why? */
		if (request_dma(dev->dma, dev->name)) {
			pr_err("%s: cannot get dma channel %d\n",
			       dev->name, dev->dma);
			goto release_irq;
		}
		write_dma(dev, lp->chip_type, dev->dma);
		lp->rx_dma_ptr = lp->dma_buff;
		lp->end_dma_buff = lp->dma_buff + lp->dmasize * 1024;
		spin_lock_irqsave(&lp->lock, flags);
		disable_dma(dev->dma);
		clear_dma_ff(dev->dma);
		set_dma_mode(dev->dma, DMA_RX_MODE); /* auto_init as well */
		set_dma_addr(dev->dma, isa_virt_to_bus(lp->dma_buff));
		set_dma_count(dev->dma, lp->dmasize * 1024);
		enable_dma(dev->dma);
		spin_unlock_irqrestore(&lp->lock, flags);
	}
#endif	/* ALLOW_DMA */

	/* set the Ethernet address */
	for (i = 0; i < ETH_ALEN / 2; i++)
		writereg(dev, PP_IA + i * 2,
			 (dev->dev_addr[i * 2] |
			  (dev->dev_addr[i * 2 + 1] << 8)));

	/* while we're testing the interface, leave interrupts disabled */
	writereg(dev, PP_BusCTL, MEMORY_ON);

	/* Set the LineCTL quintuplet based on adapter configuration read from EEPROM */
	if ((lp->adapter_cnf & A_CNF_EXTND_10B_2) &&
	    (lp->adapter_cnf & A_CNF_LOW_RX_SQUELCH))
		lp->linectl = LOW_RX_SQUELCH;
	else
		lp->linectl = 0;

	/* check to make sure that they have the "right" hardware available */
	switch (lp->adapter_cnf & A_CNF_MEDIA_TYPE) {
	case A_CNF_MEDIA_10B_T:
		result = lp->adapter_cnf & A_CNF_10B_T;
		break;
	case A_CNF_MEDIA_AUI:
		result = lp->adapter_cnf & A_CNF_AUI;
		break;
	case A_CNF_MEDIA_10B_2:
		result = lp->adapter_cnf & A_CNF_10B_2;
		break;
	default:
		result = lp->adapter_cnf & (A_CNF_10B_T |
					    A_CNF_AUI |
					    A_CNF_10B_2);
	}
	if (!result) {
		pr_err("%s: EEPROM is configured for unavailable media\n",
		       dev->name);
release_dma:
#if ALLOW_DMA
		free_dma(dev->dma);
release_irq:
		release_dma_buff(lp);
#endif
		writereg(dev, PP_LineCTL,
			 readreg(dev, PP_LineCTL) & ~(SERIAL_TX_ON | SERIAL_RX_ON));
		free_irq(dev->irq, dev);
		ret = -EAGAIN;
		goto bad_out;
	}

	/* set the hardware to the configured choice */
	switch (lp->adapter_cnf & A_CNF_MEDIA_TYPE) {
	case A_CNF_MEDIA_10B_T:
		result = detect_tp(dev);
		if (result == DETECTED_NONE) {
			pr_warn("%s: 10Base-T (RJ-45) has no cable\n",
				dev->name);
			if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
				result = DETECTED_RJ45H; /* Yes! I don't care if I see a link pulse */
		}
		break;
	case A_CNF_MEDIA_AUI:
		result = detect_aui(dev);
		if (result == DETECTED_NONE) {
			pr_warn("%s: 10Base-5 (AUI) has no cable\n", dev->name);
			if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
				result = DETECTED_AUI; /* Yes! I don't care if I see a carrrier */
		}
		break;
	case A_CNF_MEDIA_10B_2:
		result = detect_bnc(dev);
		if (result == DETECTED_NONE) {
			pr_warn("%s: 10Base-2 (BNC) has no cable\n", dev->name);
			if (lp->auto_neg_cnf & IMM_BIT) /* check "ignore missing media" bit */
				result = DETECTED_BNC; /* Yes! I don't care if I can xmit a packet */
		}
		break;
	case A_CNF_MEDIA_AUTO:
		writereg(dev, PP_LineCTL, lp->linectl | AUTO_AUI_10BASET);
		if (lp->adapter_cnf & A_CNF_10B_T) {
			result = detect_tp(dev);
			if (result != DETECTED_NONE)
				break;
		}
		if (lp->adapter_cnf & A_CNF_AUI) {
			result = detect_aui(dev);
			if (result != DETECTED_NONE)
				break;
		}
		if (lp->adapter_cnf & A_CNF_10B_2) {
			result = detect_bnc(dev);
			if (result != DETECTED_NONE)
				break;
		}
		pr_err("%s: no media detected\n", dev->name);
		goto release_dma;
	}
	switch (result) {
	case DETECTED_NONE:
		pr_err("%s: no network cable attached to configured media\n",
		       dev->name);
		goto release_dma;
	case DETECTED_RJ45H:
		pr_info("%s: using half-duplex 10Base-T (RJ-45)\n", dev->name);
		break;
	case DETECTED_RJ45F:
		pr_info("%s: using full-duplex 10Base-T (RJ-45)\n", dev->name);
		break;
	case DETECTED_AUI:
		pr_info("%s: using 10Base-5 (AUI)\n", dev->name);
		break;
	case DETECTED_BNC:
		pr_info("%s: using 10Base-2 (BNC)\n", dev->name);
		break;
	}

	/* Turn on both receive and transmit operations */
	writereg(dev, PP_LineCTL,
		 readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);

	/* Receive only error free packets addressed to this card */
	lp->rx_mode = 0;
	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);

	lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;

	if (lp->isa_config & STREAM_TRANSFER)
		lp->curr_rx_cfg |= RX_STREAM_ENBL;
#if ALLOW_DMA
	set_dma_cfg(dev);
#endif
	writereg(dev, PP_RxCFG, lp->curr_rx_cfg);

	writereg(dev, PP_TxCFG, (TX_LOST_CRS_ENBL |
				 TX_SQE_ERROR_ENBL |
				 TX_OK_ENBL |
				 TX_LATE_COL_ENBL |
				 TX_JBR_ENBL |
				 TX_ANY_COL_ENBL |
				 TX_16_COL_ENBL));

	writereg(dev, PP_BufCFG, (READY_FOR_TX_ENBL |
				  RX_MISS_COUNT_OVRFLOW_ENBL |
#if ALLOW_DMA
				  dma_bufcfg(dev) |
#endif
				  TX_COL_COUNT_OVRFLOW_ENBL |
				  TX_UNDERRUN_ENBL));

	/* now that we've got our act together, enable everything */
	writereg(dev, PP_BusCTL, (ENABLE_IRQ
				  | (dev->mem_start ? MEMORY_ON : 0) /* turn memory on */
#if ALLOW_DMA
				  | dma_busctl(dev)
#endif
			 ));
	netif_start_queue(dev);
	cs89_dbg(1, debug, "net_open() succeeded\n");
	return 0;
bad_out:
	return ret;
}

/* The inverse routine to net_open(). */
static int
net_close(struct net_device *dev)
{
#if ALLOW_DMA
	struct net_local *lp = netdev_priv(dev);
#endif

	netif_stop_queue(dev);

	writereg(dev, PP_RxCFG, 0);
	writereg(dev, PP_TxCFG, 0);
	writereg(dev, PP_BufCFG, 0);
	writereg(dev, PP_BusCTL, 0);

	free_irq(dev->irq, dev);

#if ALLOW_DMA
	if (lp->use_dma && lp->dma) {
		free_dma(dev->dma);
		release_dma_buff(lp);
	}
#endif

	/* Update the statistics here. */
	return 0;
}

/* Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *
net_get_stats(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&lp->lock, flags);
	/* Update the statistics from the device registers. */
	dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
	dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
	spin_unlock_irqrestore(&lp->lock, flags);

	return &dev->stats;
}

static void net_timeout(struct net_device *dev)
{
	/* If we get here, some higher level has decided we are broken.
	   There should really be a "kick me" function call instead. */
	cs89_dbg(0, err, "%s: transmit timed out, %s?\n",
		 dev->name,
		 tx_done(dev) ? "IRQ conflict" : "network cable problem");
	/* Try to restart the adaptor. */
	netif_wake_queue(dev);
}

static netdev_tx_t net_send_packet(struct sk_buff *skb, struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned long flags;

	cs89_dbg(3, debug, "%s: sent %d byte packet of type %x\n",
		 dev->name, skb->len,
		 ((skb->data[ETH_ALEN + ETH_ALEN] << 8) |
		  skb->data[ETH_ALEN + ETH_ALEN + 1]));

	/* keep the upload from being interrupted, since we
	 * ask the chip to start transmitting before the
	 * whole packet has been completely uploaded.
	 */

	spin_lock_irqsave(&lp->lock, flags);
	netif_stop_queue(dev);

	/* initiate a transmit sequence */
	iowrite16(lp->send_cmd, lp->virt_addr + TX_CMD_PORT);
	iowrite16(skb->len, lp->virt_addr + TX_LEN_PORT);

	/* Test to see if the chip has allocated memory for the packet */
	if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
		/* Gasp!  It hasn't.  But that shouldn't happen since
		 * we're waiting for TxOk, so return 1 and requeue this packet.
		 */

		spin_unlock_irqrestore(&lp->lock, flags);
		cs89_dbg(0, err, "Tx buffer not free!\n");
		return NETDEV_TX_BUSY;
	}
	/* Write the contents of the packet */
	writewords(lp, TX_FRAME_PORT, skb->data, (skb->len + 1) >> 1);
	spin_unlock_irqrestore(&lp->lock, flags);
	dev->stats.tx_bytes += skb->len;
	dev_consume_skb_any(skb);

	/* We DO NOT call netif_wake_queue() here.
	 * We also DO NOT call netif_start_queue().
	 *
	 * Either of these would cause another bottom half run through
	 * net_send_packet() before this packet has fully gone out.
	 * That causes us to hit the "Gasp!" above and the send is rescheduled.
	 * it runs like a dog.  We just return and wait for the Tx completion
	 * interrupt handler to restart the netdevice layer
	 */

	return NETDEV_TX_OK;
}

static void set_multicast_list(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned long flags;
	u16 cfg;

	spin_lock_irqsave(&lp->lock, flags);
	if (dev->flags & IFF_PROMISC)
		lp->rx_mode = RX_ALL_ACCEPT;
	else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
		/* The multicast-accept list is initialized to accept-all,
		 * and we rely on higher-level filtering for now.
		 */
		lp->rx_mode = RX_MULTCAST_ACCEPT;
	else
		lp->rx_mode = 0;

	writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);

	/* in promiscuous mode, we accept errored packets,
	 * so we have to enable interrupts on them also
	 */
	cfg = lp->curr_rx_cfg;
	if (lp->rx_mode == RX_ALL_ACCEPT)
		cfg |= RX_CRC_ERROR_ENBL | RX_RUNT_ENBL | RX_EXTRA_DATA_ENBL;
	writereg(dev, PP_RxCFG, cfg);
	spin_unlock_irqrestore(&lp->lock, flags);
}

static int set_mac_address(struct net_device *dev, void *p)
{
	int i;
	struct sockaddr *addr = p;

	if (netif_running(dev))
		return -EBUSY;

	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

	cs89_dbg(0, debug, "%s: Setting MAC address to %pM\n",
		 dev->name, dev->dev_addr);

	/* set the Ethernet address */
	for (i = 0; i < ETH_ALEN / 2; i++)
		writereg(dev, PP_IA + i * 2,
			 (dev->dev_addr[i * 2] |
			  (dev->dev_addr[i * 2 + 1] << 8)));

	return 0;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * Polling receive - used by netconsole and other diagnostic tools
 * to allow network i/o with interrupts disabled.
 */
static void net_poll_controller(struct net_device *dev)
{
	disable_irq(dev->irq);
	net_interrupt(dev->irq, dev);
	enable_irq(dev->irq);
}
#endif

static const struct net_device_ops net_ops = {
	.ndo_open		= net_open,
	.ndo_stop		= net_close,
	.ndo_tx_timeout		= net_timeout,
	.ndo_start_xmit		= net_send_packet,
	.ndo_get_stats		= net_get_stats,
	.ndo_set_rx_mode	= set_multicast_list,
	.ndo_set_mac_address	= set_mac_address,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= net_poll_controller,
#endif
	.ndo_validate_addr	= eth_validate_addr,
};

static void __init reset_chip(struct net_device *dev)
{
#if !defined(CONFIG_MACH_MX31ADS)
	struct net_local *lp = netdev_priv(dev);
	unsigned long reset_start_time;

	writereg(dev, PP_SelfCTL, readreg(dev, PP_SelfCTL) | POWER_ON_RESET);

	/* wait 30 ms */
	msleep(30);

	if (lp->chip_type != CS8900) {
		/* Hardware problem requires PNP registers to be reconfigured after a reset */
		iowrite16(PP_CS8920_ISAINT, lp->virt_addr + ADD_PORT);
		iowrite8(dev->irq, lp->virt_addr + DATA_PORT);
		iowrite8(0, lp->virt_addr + DATA_PORT + 1);

		iowrite16(PP_CS8920_ISAMemB, lp->virt_addr + ADD_PORT);
		iowrite8((dev->mem_start >> 16) & 0xff,
			 lp->virt_addr + DATA_PORT);
		iowrite8((dev->mem_start >> 8) & 0xff,
			 lp->virt_addr + DATA_PORT + 1);
	}

	/* Wait until the chip is reset */
	reset_start_time = jiffies;
	while ((readreg(dev, PP_SelfST) & INIT_DONE) == 0 &&
	       time_before(jiffies, reset_start_time + 2))
		;
#endif /* !CONFIG_MACH_MX31ADS */
}

/* This is the real probe routine.
 * Linux has a history of friendly device probes on the ISA bus.
 * A good device probes avoids doing writes, and
 * verifies that the correct device exists and functions.
 * Return 0 on success.
 */
static int __init
cs89x0_probe1(struct net_device *dev, void __iomem *ioaddr, int modular)
{
	struct net_local *lp = netdev_priv(dev);
	int i;
	int tmp;
	unsigned rev_type = 0;
	int eeprom_buff[CHKSUM_LEN];
	int retval;

	/* Initialize the device structure. */
	if (!modular) {
		memset(lp, 0, sizeof(*lp));
		spin_lock_init(&lp->lock);
#ifndef MODULE
#if ALLOW_DMA
		if (g_cs89x0_dma) {
			lp->use_dma = 1;
			lp->dma = g_cs89x0_dma;
			lp->dmasize = 16;	/* Could make this an option... */
		}
#endif
		lp->force = g_cs89x0_media__force;
#endif
	}

	pr_debug("PP_addr at %p[%x]: 0x%x\n",
		 ioaddr, ADD_PORT, ioread16(ioaddr + ADD_PORT));
	iowrite16(PP_ChipID, ioaddr + ADD_PORT);

	tmp = ioread16(ioaddr + DATA_PORT);
	if (tmp != CHIP_EISA_ID_SIG) {
		pr_debug("%s: incorrect signature at %p[%x]: 0x%x!="
			 CHIP_EISA_ID_SIG_STR "\n",
			 dev->name, ioaddr, DATA_PORT, tmp);
		retval = -ENODEV;
		goto out1;
	}

	lp->virt_addr = ioaddr;

	/* get the chip type */
	rev_type = readreg(dev, PRODUCT_ID_ADD);
	lp->chip_type = rev_type & ~REVISON_BITS;
	lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';

	/* Check the chip type and revision in order to set the correct
	 * send command.  CS8920 revision C and CS8900 revision F can use
	 * the faster send.
	 */
	lp->send_cmd = TX_AFTER_381;
	if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
		lp->send_cmd = TX_NOW;
	if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
		lp->send_cmd = TX_NOW;

	pr_info_once("%s\n", version);

	pr_info("%s: cs89%c0%s rev %c found at %p ",
		dev->name,
		lp->chip_type == CS8900  ? '0' : '2',
		lp->chip_type == CS8920M ? "M" : "",
		lp->chip_revision,
		lp->virt_addr);

	reset_chip(dev);

	/* Here we read the current configuration of the chip.
	 * If there is no Extended EEPROM then the idea is to not disturb
	 * the chip configuration, it should have been correctly setup by
	 * automatic EEPROM read on reset. So, if the chip says it read
	 * the EEPROM the driver will always do *something* instead of
	 * complain that adapter_cnf is 0.
	 */

	if ((readreg(dev, PP_SelfST) & (EEPROM_OK | EEPROM_PRESENT)) ==
	    (EEPROM_OK | EEPROM_PRESENT)) {
		/* Load the MAC. */
		for (i = 0; i < ETH_ALEN / 2; i++) {
			unsigned int Addr;
			Addr = readreg(dev, PP_IA + i * 2);
			dev->dev_addr[i * 2] = Addr & 0xFF;
			dev->dev_addr[i * 2 + 1] = Addr >> 8;
		}

		/* Load the Adapter Configuration.
		 * Note:  Barring any more specific information from some
		 * other source (ie EEPROM+Schematics), we would not know
		 * how to operate a 10Base2 interface on the AUI port.
		 * However, since we  do read the status of HCB1 and use
		 * settings that always result in calls to control_dc_dc(dev,0)
		 * a BNC interface should work if the enable pin
		 * (dc/dc converter) is on HCB1.
		 * It will be called AUI however.
		 */

		lp->adapter_cnf = 0;
		i = readreg(dev, PP_LineCTL);
		/* Preserve the setting of the HCB1 pin. */
		if ((i & (HCB1 | HCB1_ENBL)) == (HCB1 | HCB1_ENBL))
			lp->adapter_cnf |= A_CNF_DC_DC_POLARITY;
		/* Save the sqelch bit */
		if ((i & LOW_RX_SQUELCH) == LOW_RX_SQUELCH)
			lp->adapter_cnf |= A_CNF_EXTND_10B_2 | A_CNF_LOW_RX_SQUELCH;
		/* Check if the card is in 10Base-t only mode */
		if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == 0)
			lp->adapter_cnf |=  A_CNF_10B_T | A_CNF_MEDIA_10B_T;
		/* Check if the card is in AUI only mode */
		if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == AUI_ONLY)
			lp->adapter_cnf |=  A_CNF_AUI | A_CNF_MEDIA_AUI;
		/* Check if the card is in Auto mode. */
		if ((i & (AUI_ONLY | AUTO_AUI_10BASET)) == AUTO_AUI_10BASET)
			lp->adapter_cnf |=  A_CNF_AUI | A_CNF_10B_T |
				A_CNF_MEDIA_AUI | A_CNF_MEDIA_10B_T | A_CNF_MEDIA_AUTO;

		cs89_dbg(1, info, "%s: PP_LineCTL=0x%x, adapter_cnf=0x%x\n",
			 dev->name, i, lp->adapter_cnf);

		/* IRQ. Other chips already probe, see below. */
		if (lp->chip_type == CS8900)
			lp->isa_config = readreg(dev, PP_CS8900_ISAINT) & INT_NO_MASK;

		pr_cont("[Cirrus EEPROM] ");
	}

	pr_cont("\n");

	/* First check to see if an EEPROM is attached. */

	if ((readreg(dev, PP_SelfST) & EEPROM_PRESENT) == 0)
		pr_warn("No EEPROM, relying on command line....\n");
	else if (get_eeprom_data(dev, START_EEPROM_DATA, CHKSUM_LEN, eeprom_buff) < 0) {
		pr_warn("EEPROM read failed, relying on command line\n");
	} else if (get_eeprom_cksum(START_EEPROM_DATA, CHKSUM_LEN, eeprom_buff) < 0) {
		/* Check if the chip was able to read its own configuration starting
		   at 0 in the EEPROM*/
		if ((readreg(dev, PP_SelfST) & (EEPROM_OK | EEPROM_PRESENT)) !=
		    (EEPROM_OK | EEPROM_PRESENT))
			pr_warn("Extended EEPROM checksum bad and no Cirrus EEPROM, relying on command line\n");

	} else {
		/* This reads an extended EEPROM that is not documented
		 * in the CS8900 datasheet.
		 */

		/* get transmission control word  but keep the autonegotiation bits */
		if (!lp->auto_neg_cnf)
			lp->auto_neg_cnf = eeprom_buff[AUTO_NEG_CNF_OFFSET / 2];
		/* Store adapter configuration */
		if (!lp->adapter_cnf)
			lp->adapter_cnf = eeprom_buff[ADAPTER_CNF_OFFSET / 2];
		/* Store ISA configuration */
		lp->isa_config = eeprom_buff[ISA_CNF_OFFSET / 2];
		dev->mem_start = eeprom_buff[PACKET_PAGE_OFFSET / 2] << 8;

		/* eeprom_buff has 32-bit ints, so we can't just memcpy it */
		/* store the initial memory base address */
		for (i = 0; i < ETH_ALEN / 2; i++) {
			dev->dev_addr[i * 2] = eeprom_buff[i];
			dev->dev_addr[i * 2 + 1] = eeprom_buff[i] >> 8;
		}
		cs89_dbg(1, debug, "%s: new adapter_cnf: 0x%x\n",
			 dev->name, lp->adapter_cnf);
	}

	/* allow them to force multiple transceivers.  If they force multiple, autosense */
	{
		int count = 0;
		if (lp->force & FORCE_RJ45) {
			lp->adapter_cnf |= A_CNF_10B_T;
			count++;
		}
		if (lp->force & FORCE_AUI) {
			lp->adapter_cnf |= A_CNF_AUI;
			count++;
		}
		if (lp->force & FORCE_BNC) {
			lp->adapter_cnf |= A_CNF_10B_2;
			count++;
		}
		if (count > 1)
			lp->adapter_cnf |= A_CNF_MEDIA_AUTO;
		else if (lp->force & FORCE_RJ45)
			lp->adapter_cnf |= A_CNF_MEDIA_10B_T;
		else if (lp->force & FORCE_AUI)
			lp->adapter_cnf |= A_CNF_MEDIA_AUI;
		else if (lp->force & FORCE_BNC)
			lp->adapter_cnf |= A_CNF_MEDIA_10B_2;
	}

	cs89_dbg(1, debug, "%s: after force 0x%x, adapter_cnf=0x%x\n",
		 dev->name, lp->force, lp->adapter_cnf);

	/* FIXME: We don't let you set dc-dc polarity or low RX squelch from the command line: add it here */

	/* FIXME: We don't let you set the IMM bit from the command line: add it to lp->auto_neg_cnf here */

	/* FIXME: we don't set the Ethernet address on the command line.  Use
	 * ifconfig IFACE hw ether AABBCCDDEEFF
	 */

	pr_info("media %s%s%s",
		(lp->adapter_cnf & A_CNF_10B_T) ? "RJ-45," : "",
		(lp->adapter_cnf & A_CNF_AUI) ? "AUI," : "",
		(lp->adapter_cnf & A_CNF_10B_2) ? "BNC," : "");

	lp->irq_map = 0xffff;

	/* If this is a CS8900 then no pnp soft */
	if (lp->chip_type != CS8900 &&
	    /* Check if the ISA IRQ has been set  */
	    (i = readreg(dev, PP_CS8920_ISAINT) & 0xff,
	     (i != 0 && i < CS8920_NO_INTS))) {
		if (!dev->irq)
			dev->irq = i;
	} else {
		i = lp->isa_config & INT_NO_MASK;
#ifndef CONFIG_CS89x0_PLATFORM
		if (lp->chip_type == CS8900) {
			/* Translate the IRQ using the IRQ mapping table. */
			if (i >= ARRAY_SIZE(cs8900_irq_map))
				pr_err("invalid ISA interrupt number %d\n", i);
			else
				i = cs8900_irq_map[i];

			lp->irq_map = CS8900_IRQ_MAP; /* fixed IRQ map for CS8900 */
		} else {
			int irq_map_buff[IRQ_MAP_LEN/2];

			if (get_eeprom_data(dev, IRQ_MAP_EEPROM_DATA,
					    IRQ_MAP_LEN / 2,
					    irq_map_buff) >= 0) {
				if ((irq_map_buff[0] & 0xff) == PNP_IRQ_FRMT)
					lp->irq_map = ((irq_map_buff[0] >> 8) |
						       (irq_map_buff[1] << 8));
			}
		}
#endif
		if (!dev->irq)
			dev->irq = i;
	}

	pr_cont(" IRQ %d", dev->irq);

#if ALLOW_DMA
	if (lp->use_dma) {
		get_dma_channel(dev);
		pr_cont(", DMA %d", dev->dma);
	} else
#endif
		pr_cont(", programmed I/O");

	/* print the ethernet address. */
	pr_cont(", MAC %pM\n", dev->dev_addr);

	dev->netdev_ops	= &net_ops;
	dev->watchdog_timeo = HZ;

	cs89_dbg(0, info, "cs89x0_probe1() successful\n");

	retval = register_netdev(dev);
	if (retval)
		goto out2;
	return 0;
out2:
	iowrite16(PP_ChipID, lp->virt_addr + ADD_PORT);
out1:
	return retval;
}

#ifndef CONFIG_CS89x0_PLATFORM
/*
 * This function converts the I/O port address used by the cs89x0_probe() and
 * init_module() functions to the I/O memory address used by the
 * cs89x0_probe1() function.
 */
static int __init
cs89x0_ioport_probe(struct net_device *dev, unsigned long ioport, int modular)
{
	struct net_local *lp = netdev_priv(dev);
	int ret;
	void __iomem *io_mem;

	if (!lp)
		return -ENOMEM;

	dev->base_addr = ioport;

	if (!request_region(ioport, NETCARD_IO_EXTENT, DRV_NAME)) {
		ret = -EBUSY;
		goto out;
	}

	io_mem = ioport_map(ioport & ~3, NETCARD_IO_EXTENT);
	if (!io_mem) {
		ret = -ENOMEM;
		goto release;
	}

	/* if they give us an odd I/O address, then do ONE write to
	 * the address port, to get it back to address zero, where we
	 * expect to find the EISA signature word. An IO with a base of 0x3
	 * will skip the test for the ADD_PORT.
	 */
	if (ioport & 1) {
		cs89_dbg(1, info, "%s: odd ioaddr 0x%lx\n", dev->name, ioport);
		if ((ioport & 2) != 2) {
			if ((ioread16(io_mem + ADD_PORT) & ADD_MASK) !=
			    ADD_SIG) {
				pr_err("%s: bad signature 0x%x\n",
				       dev->name, ioread16(io_mem + ADD_PORT));
				ret = -ENODEV;
				goto unmap;
			}
		}
	}

	ret = cs89x0_probe1(dev, io_mem, modular);
	if (!ret)
		goto out;
unmap:
	ioport_unmap(io_mem);
release:
	release_region(ioport, NETCARD_IO_EXTENT);
out:
	return ret;
}

#ifndef MODULE
/* Check for a network adaptor of this type, and return '0' iff one exists.
 * If dev->base_addr == 0, probe all likely locations.
 * If dev->base_addr == 1, always return failure.
 * If dev->base_addr == 2, allocate space for the device and return success
 * (detachable devices only).
 * Return 0 on success.
 */

struct net_device * __init cs89x0_probe(int unit)
{
	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
	unsigned *port;
	int err = 0;
	int irq;
	int io;

	if (!dev)
		return ERR_PTR(-ENODEV);

	sprintf(dev->name, "eth%d", unit);
	netdev_boot_setup_check(dev);
	io = dev->base_addr;
	irq = dev->irq;

	cs89_dbg(0, info, "cs89x0_probe(0x%x)\n", io);

	if (io > 0x1ff)	{	/* Check a single specified location. */
		err = cs89x0_ioport_probe(dev, io, 0);
	} else if (io != 0) {	/* Don't probe at all. */
		err = -ENXIO;
	} else {
		for (port = netcard_portlist; *port; port++) {
			if (cs89x0_ioport_probe(dev, *port, 0) == 0)
				break;
			dev->irq = irq;
		}
		if (!*port)
			err = -ENODEV;
	}
	if (err)
		goto out;
	return dev;
out:
	free_netdev(dev);
	pr_warn("no cs8900 or cs8920 detected.  Be sure to disable PnP with SETUP\n");
	return ERR_PTR(err);
}
#endif
#endif

#if defined(MODULE) && !defined(CONFIG_CS89x0_PLATFORM)

static struct net_device *dev_cs89x0;

/* Support the 'debug' module parm even if we're compiled for non-debug to
 * avoid breaking someone's startup scripts
 */

static int io;
static int irq;
static int debug;
static char media[8];
static int duplex = -1;

static int use_dma;			/* These generate unused var warnings if ALLOW_DMA = 0 */
static int dma;
static int dmasize = 16;		/* or 64 */

module_param_hw(io, int, ioport, 0);
module_param_hw(irq, int, irq, 0);
module_param(debug, int, 0);
module_param_string(media, media, sizeof(media), 0);
module_param(duplex, int, 0);
module_param_hw(dma , int, dma, 0);
module_param(dmasize , int, 0);
module_param(use_dma , int, 0);
MODULE_PARM_DESC(io, "cs89x0 I/O base address");
MODULE_PARM_DESC(irq, "cs89x0 IRQ number");
#if DEBUGGING
MODULE_PARM_DESC(debug, "cs89x0 debug level (0-6)");
#else
MODULE_PARM_DESC(debug, "(ignored)");
#endif
MODULE_PARM_DESC(media, "Set cs89x0 adapter(s) media type(s) (rj45,bnc,aui)");
/* No other value than -1 for duplex seems to be currently interpreted */
MODULE_PARM_DESC(duplex, "(ignored)");
#if ALLOW_DMA
MODULE_PARM_DESC(dma , "cs89x0 ISA DMA channel; ignored if use_dma=0");
MODULE_PARM_DESC(dmasize , "cs89x0 DMA size in kB (16,64); ignored if use_dma=0");
MODULE_PARM_DESC(use_dma , "cs89x0 using DMA (0-1)");
#else
MODULE_PARM_DESC(dma , "(ignored)");
MODULE_PARM_DESC(dmasize , "(ignored)");
MODULE_PARM_DESC(use_dma , "(ignored)");
#endif

MODULE_AUTHOR("Mike Cruse, Russwll Nelson <nelson@crynwr.com>, Andrew Morton");
MODULE_LICENSE("GPL");

/*
 * media=t             - specify media type
 * or media=2
 * or media=aui
 * or medai=auto
 * duplex=0            - specify forced half/full/autonegotiate duplex
 * debug=#             - debug level
 *
 * Default Chip Configuration:
 * DMA Burst = enabled
 * IOCHRDY Enabled = enabled
 * UseSA = enabled
 * CS8900 defaults to half-duplex if not specified on command-line
 * CS8920 defaults to autoneg if not specified on command-line
 * Use reset defaults for other config parameters
 *
 * Assumptions:
 * media type specified is supported (circuitry is present)
 * if memory address is > 1MB, then required mem decode hw is present
 * if 10B-2, then agent other than driver will enable DC/DC converter
 * (hw or software util)
 */

int __init init_module(void)
{
	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
	struct net_local *lp;
	int ret = 0;

#if DEBUGGING
	net_debug = debug;
#else
	debug = 0;
#endif
	if (!dev)
		return -ENOMEM;

	dev->irq = irq;
	dev->base_addr = io;
	lp = netdev_priv(dev);

#if ALLOW_DMA
	if (use_dma) {
		lp->use_dma = use_dma;
		lp->dma = dma;
		lp->dmasize = dmasize;
	}
#endif

	spin_lock_init(&lp->lock);

	/* boy, they'd better get these right */
	if (!strcmp(media, "rj45"))
		lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;
	else if (!strcmp(media, "aui"))
		lp->adapter_cnf = A_CNF_MEDIA_AUI   | A_CNF_AUI;
	else if (!strcmp(media, "bnc"))
		lp->adapter_cnf = A_CNF_MEDIA_10B_2 | A_CNF_10B_2;
	else
		lp->adapter_cnf = A_CNF_MEDIA_10B_T | A_CNF_10B_T;

	if (duplex == -1)
		lp->auto_neg_cnf = AUTO_NEG_ENABLE;

	if (io == 0) {
		pr_err("Module autoprobing not allowed\n");
		pr_err("Append io=0xNNN\n");
		ret = -EPERM;
		goto out;
	} else if (io <= 0x1ff) {
		ret = -ENXIO;
		goto out;
	}

#if ALLOW_DMA
	if (use_dma && dmasize != 16 && dmasize != 64) {
		pr_err("dma size must be either 16K or 64K, not %dK\n",
		       dmasize);
		ret = -EPERM;
		goto out;
	}
#endif
	ret = cs89x0_ioport_probe(dev, io, 1);
	if (ret)
		goto out;

	dev_cs89x0 = dev;
	return 0;
out:
	free_netdev(dev);
	return ret;
}

void __exit
cleanup_module(void)
{
	struct net_local *lp = netdev_priv(dev_cs89x0);

	unregister_netdev(dev_cs89x0);
	iowrite16(PP_ChipID, lp->virt_addr + ADD_PORT);
	ioport_unmap(lp->virt_addr);
	release_region(dev_cs89x0->base_addr, NETCARD_IO_EXTENT);
	free_netdev(dev_cs89x0);
}
#endif /* MODULE && !CONFIG_CS89x0_PLATFORM */

#ifdef CONFIG_CS89x0_PLATFORM
static int __init cs89x0_platform_probe(struct platform_device *pdev)
{
	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
	void __iomem *virt_addr;
	int err;

	if (!dev)
		return -ENOMEM;

	dev->irq = platform_get_irq(pdev, 0);
	if (dev->irq <= 0) {
		dev_warn(&dev->dev, "interrupt resource missing\n");
		err = -ENXIO;
		goto free;
	}

	virt_addr = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(virt_addr)) {
		err = PTR_ERR(virt_addr);
		goto free;
	}

	err = cs89x0_probe1(dev, virt_addr, 0);
	if (err) {
		dev_warn(&dev->dev, "no cs8900 or cs8920 detected\n");
		goto free;
	}

	platform_set_drvdata(pdev, dev);
	return 0;

free:
	free_netdev(dev);
	return err;
}

static int cs89x0_platform_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);

	/* This platform_get_resource() call will not return NULL, because
	 * the same call in cs89x0_platform_probe() has returned a non NULL
	 * value.
	 */
	unregister_netdev(dev);
	free_netdev(dev);
	return 0;
}

static const struct of_device_id __maybe_unused cs89x0_match[] = {
	{ .compatible = "cirrus,cs8900", },
	{ .compatible = "cirrus,cs8920", },
	{ },
};
MODULE_DEVICE_TABLE(of, cs89x0_match);

static struct platform_driver cs89x0_driver = {
	.driver	= {
		.name		= DRV_NAME,
		.of_match_table	= of_match_ptr(cs89x0_match),
	},
	.remove	= cs89x0_platform_remove,
};

module_platform_driver_probe(cs89x0_driver, cs89x0_platform_probe);

#endif /* CONFIG_CS89x0_PLATFORM */

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Crystal Semiconductor (Now Cirrus Logic) CS89[02]0 network driver");
MODULE_AUTHOR("Russell Nelson <nelson@crynwr.com>");