summaryrefslogtreecommitdiff
path: root/drivers/char/pcmcia/ipwireless/hardware.c
blob: 929101ecbae29c180889a1d10e8c7f0549bcd713 (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
/*
 * IPWireless 3G PCMCIA Network Driver
 *
 * Original code
 *   by Stephen Blackheath <stephen@blacksapphire.com>,
 *      Ben Martel <benm@symmetric.co.nz>
 *
 * Copyrighted as follows:
 *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
 *
 * Various driver changes and rewrites, port to new kernels
 *   Copyright (C) 2006-2007 Jiri Kosina
 *
 * Misc code cleanups and updates
 *   Copyright (C) 2007 David Sterba
 */

#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/slab.h>

#include "hardware.h"
#include "setup_protocol.h"
#include "network.h"
#include "main.h"

static void ipw_send_setup_packet(struct ipw_hardware *hw);
static void handle_received_SETUP_packet(struct ipw_hardware *ipw,
					 unsigned int address,
					 unsigned char *data, int len,
					 int is_last);
static void ipwireless_setup_timer(unsigned long data);
static void handle_received_CTRL_packet(struct ipw_hardware *hw,
		unsigned int channel_idx, unsigned char *data, int len);

/*#define TIMING_DIAGNOSTICS*/

#ifdef TIMING_DIAGNOSTICS

static struct timing_stats {
	unsigned long last_report_time;
	unsigned long read_time;
	unsigned long write_time;
	unsigned long read_bytes;
	unsigned long write_bytes;
	unsigned long start_time;
};

static void start_timing(void)
{
	timing_stats.start_time = jiffies;
}

static void end_read_timing(unsigned length)
{
	timing_stats.read_time += (jiffies - start_time);
	timing_stats.read_bytes += length + 2;
	report_timing();
}

static void end_write_timing(unsigned length)
{
	timing_stats.write_time += (jiffies - start_time);
	timing_stats.write_bytes += length + 2;
	report_timing();
}

static void report_timing(void)
{
	unsigned long since = jiffies - timing_stats.last_report_time;

	/* If it's been more than one second... */
	if (since >= HZ) {
		int first = (timing_stats.last_report_time == 0);

		timing_stats.last_report_time = jiffies;
		if (!first)
			printk(KERN_INFO IPWIRELESS_PCCARD_NAME
			       ": %u us elapsed - read %lu bytes in %u us, "
			       "wrote %lu bytes in %u us\n",
			       jiffies_to_usecs(since),
			       timing_stats.read_bytes,
			       jiffies_to_usecs(timing_stats.read_time),
			       timing_stats.write_bytes,
			       jiffies_to_usecs(timing_stats.write_time));

		timing_stats.read_time = 0;
		timing_stats.write_time = 0;
		timing_stats.read_bytes = 0;
		timing_stats.write_bytes = 0;
	}
}
#else
static void start_timing(void) { }
static void end_read_timing(unsigned length) { }
static void end_write_timing(unsigned length) { }
#endif

/* Imported IPW definitions */

#define LL_MTU_V1 318
#define LL_MTU_V2 250
#define LL_MTU_MAX (LL_MTU_V1 > LL_MTU_V2 ? LL_MTU_V1 : LL_MTU_V2)

#define PRIO_DATA  2
#define PRIO_CTRL  1
#define PRIO_SETUP 0

/* Addresses */
#define ADDR_SETUP_PROT 0

/* Protocol ids */
enum {
	/* Identifier for the Com Data protocol */
	TL_PROTOCOLID_COM_DATA = 0,

	/* Identifier for the Com Control protocol */
	TL_PROTOCOLID_COM_CTRL = 1,

	/* Identifier for the Setup protocol */
	TL_PROTOCOLID_SETUP = 2
};

/* Number of bytes in NL packet header (cannot do
 * sizeof(nl_packet_header) since it's a bitfield) */
#define NL_FIRST_PACKET_HEADER_SIZE        3

/* Number of bytes in NL packet header (cannot do
 * sizeof(nl_packet_header) since it's a bitfield) */
#define NL_FOLLOWING_PACKET_HEADER_SIZE    1

struct nl_first_packet_header {
#if defined(__BIG_ENDIAN_BITFIELD)
	unsigned char packet_rank:2;
	unsigned char address:3;
	unsigned char protocol:3;
#else
	unsigned char protocol:3;
	unsigned char address:3;
	unsigned char packet_rank:2;
#endif
	unsigned char length_lsb;
	unsigned char length_msb;
};

struct nl_packet_header {
#if defined(__BIG_ENDIAN_BITFIELD)
	unsigned char packet_rank:2;
	unsigned char address:3;
	unsigned char protocol:3;
#else
	unsigned char protocol:3;
	unsigned char address:3;
	unsigned char packet_rank:2;
#endif
};

/* Value of 'packet_rank' above */
#define NL_INTERMEDIATE_PACKET    0x0
#define NL_LAST_PACKET            0x1
#define NL_FIRST_PACKET           0x2

union nl_packet {
	/* Network packet header of the first packet (a special case) */
	struct nl_first_packet_header hdr_first;
	/* Network packet header of the following packets (if any) */
	struct nl_packet_header hdr;
	/* Complete network packet (header + data) */
	unsigned char rawpkt[LL_MTU_MAX];
} __attribute__ ((__packed__));

#define HW_VERSION_UNKNOWN -1
#define HW_VERSION_1 1
#define HW_VERSION_2 2

/* IPW I/O ports */
#define IOIER 0x00		/* Interrupt Enable Register */
#define IOIR  0x02		/* Interrupt Source/ACK register */
#define IODCR 0x04		/* Data Control Register */
#define IODRR 0x06		/* Data Read Register */
#define IODWR 0x08		/* Data Write Register */
#define IOESR 0x0A		/* Embedded Driver Status Register */
#define IORXR 0x0C		/* Rx Fifo Register (Host to Embedded) */
#define IOTXR 0x0E		/* Tx Fifo Register (Embedded to Host) */

/* I/O ports and bit definitions for version 1 of the hardware */

/* IER bits*/
#define IER_RXENABLED   0x1
#define IER_TXENABLED   0x2

/* ISR bits */
#define IR_RXINTR       0x1
#define IR_TXINTR       0x2

/* DCR bits */
#define DCR_RXDONE      0x1
#define DCR_TXDONE      0x2
#define DCR_RXRESET     0x4
#define DCR_TXRESET     0x8

/* I/O ports and bit definitions for version 2 of the hardware */

struct MEMCCR {
	unsigned short reg_config_option;	/* PCCOR: Configuration Option Register */
	unsigned short reg_config_and_status;	/* PCCSR: Configuration and Status Register */
	unsigned short reg_pin_replacement;	/* PCPRR: Pin Replacemant Register */
	unsigned short reg_socket_and_copy;	/* PCSCR: Socket and Copy Register */
	unsigned short reg_ext_status;		/* PCESR: Extendend Status Register */
	unsigned short reg_io_base;		/* PCIOB: I/O Base Register */
};

struct MEMINFREG {
	unsigned short memreg_tx_old;	/* TX Register (R/W) */
	unsigned short pad1;
	unsigned short memreg_rx_done;	/* RXDone Register (R/W) */
	unsigned short pad2;
	unsigned short memreg_rx;	/* RX Register (R/W) */
	unsigned short pad3;
	unsigned short memreg_pc_interrupt_ack;	/* PC intr Ack Register (W) */
	unsigned short pad4;
	unsigned long memreg_card_present;/* Mask for Host to check (R) for
					   * CARD_PRESENT_VALUE */
	unsigned short memreg_tx_new;	/* TX2 (new) Register (R/W) */
};

#define IODMADPR 0x00		/* DMA Data Port Register (R/W) */

#define CARD_PRESENT_VALUE (0xBEEFCAFEUL)

#define MEMTX_TX                       0x0001
#define MEMRX_RX                       0x0001
#define MEMRX_RX_DONE                  0x0001
#define MEMRX_PCINTACKK                0x0001
#define MEMRX_MEMSPURIOUSINT           0x0001

#define NL_NUM_OF_PRIORITIES       3
#define NL_NUM_OF_PROTOCOLS        3
#define NL_NUM_OF_ADDRESSES        NO_OF_IPW_CHANNELS

struct ipw_hardware {
	unsigned int base_port;
	short hw_version;
	unsigned short ll_mtu;
	spinlock_t spinlock;

	int initializing;
	int init_loops;
	struct timer_list setup_timer;

	/* Flag if hw is ready to send next packet */
	int tx_ready;
	/* Count of pending packets to be sent */
	int tx_queued;
	struct list_head tx_queue[NL_NUM_OF_PRIORITIES];

	int rx_bytes_queued;
	struct list_head rx_queue;
	/* Pool of rx_packet structures that are not currently used. */
	struct list_head rx_pool;
	int rx_pool_size;
	/* True if reception of data is blocked while userspace processes it. */
	int blocking_rx;
	/* True if there is RX data ready on the hardware. */
	int rx_ready;
	unsigned short last_memtx_serial;
	/*
	 * Newer versions of the V2 card firmware send serial numbers in the
	 * MemTX register. 'serial_number_detected' is set true when we detect
	 * a non-zero serial number (indicating the new firmware).  Thereafter,
	 * the driver can safely ignore the Timer Recovery re-sends to avoid
	 * out-of-sync problems.
	 */
	int serial_number_detected;
	struct work_struct work_rx;

	/* True if we are to send the set-up data to the hardware. */
	int to_setup;

	/* Card has been removed */
	int removed;
	/* Saved irq value when we disable the interrupt. */
	int irq;
	/* True if this driver is shutting down. */
	int shutting_down;
	/* Modem control lines */
	unsigned int control_lines[NL_NUM_OF_ADDRESSES];
	struct ipw_rx_packet *packet_assembler[NL_NUM_OF_ADDRESSES];

	struct tasklet_struct tasklet;

	/* The handle for the network layer, for the sending of events to it. */
	struct ipw_network *network;
	struct MEMINFREG __iomem *memory_info_regs;
	struct MEMCCR __iomem *memregs_CCR;
	void (*reboot_callback) (void *data);
	void *reboot_callback_data;

	unsigned short __iomem *memreg_tx;
};

/*
 * Packet info structure for tx packets.
 * Note: not all the fields defined here are required for all protocols
 */
struct ipw_tx_packet {
	struct list_head queue;
	/* channel idx + 1 */
	unsigned char dest_addr;
	/* SETUP, CTRL or DATA */
	unsigned char protocol;
	/* Length of data block, which starts at the end of this structure */
	unsigned short length;
	/* Sending state */
	/* Offset of where we've sent up to so far */
	unsigned long offset;
	/* Count of packet fragments, starting at 0 */
	int fragment_count;

	/* Called after packet is sent and before is freed */
	void (*packet_callback) (void *cb_data, unsigned int packet_length);
	void *callback_data;
};

/* Signals from DTE */
#define COMCTRL_RTS	0
#define COMCTRL_DTR	1

/* Signals from DCE */
#define COMCTRL_CTS	2
#define COMCTRL_DCD	3
#define COMCTRL_DSR	4
#define COMCTRL_RI	5

struct ipw_control_packet_body {
	/* DTE signal or DCE signal */
	unsigned char sig_no;
	/* 0: set signal, 1: clear signal */
	unsigned char value;
} __attribute__ ((__packed__));

struct ipw_control_packet {
	struct ipw_tx_packet header;
	struct ipw_control_packet_body body;
};

struct ipw_rx_packet {
	struct list_head queue;
	unsigned int capacity;
	unsigned int length;
	unsigned int protocol;
	unsigned int channel_idx;
};

static char *data_type(const unsigned char *buf, unsigned length)
{
	struct nl_packet_header *hdr = (struct nl_packet_header *) buf;

	if (length == 0)
		return "     ";

	if (hdr->packet_rank & NL_FIRST_PACKET) {
		switch (hdr->protocol) {
		case TL_PROTOCOLID_COM_DATA:	return "DATA ";
		case TL_PROTOCOLID_COM_CTRL:	return "CTRL ";
		case TL_PROTOCOLID_SETUP:	return "SETUP";
		default: return "???? ";
		}
	} else
		return "     ";
}

#define DUMP_MAX_BYTES 64

static void dump_data_bytes(const char *type, const unsigned char *data,
			    unsigned length)
{
	char prefix[56];

	sprintf(prefix, IPWIRELESS_PCCARD_NAME ": %s %s ",
			type, data_type(data, length));
	print_hex_dump_bytes(prefix, 0, (void *)data,
			length < DUMP_MAX_BYTES ? length : DUMP_MAX_BYTES);
}

static int do_send_fragment(struct ipw_hardware *hw, const unsigned char *data,
			    unsigned length)
{
	int i;
	unsigned long flags;

	start_timing();

	if (length == 0)
		return 0;

	if (length > hw->ll_mtu)
		return -1;

	if (ipwireless_debug)
		dump_data_bytes("send", data, length);

	spin_lock_irqsave(&hw->spinlock, flags);

	hw->tx_ready = 0;

	if (hw->hw_version == HW_VERSION_1) {
		outw((unsigned short) length, hw->base_port + IODWR);

		for (i = 0; i < length; i += 2) {
			unsigned short d = data[i];
			__le16 raw_data;

			if (likely(i + 1 < length))
				d |= data[i + 1] << 8;
			raw_data = cpu_to_le16(d);
			outw(raw_data, hw->base_port + IODWR);
		}

		outw(DCR_TXDONE, hw->base_port + IODCR);
	} else if (hw->hw_version == HW_VERSION_2) {
		outw((unsigned short) length, hw->base_port + IODMADPR);

		for (i = 0; i < length; i += 2) {
			unsigned short d = data[i];
			__le16 raw_data;

			if ((i + 1 < length))
				d |= data[i + 1] << 8;
			raw_data = cpu_to_le16(d);
			outw(raw_data, hw->base_port + IODMADPR);
		}
		while ((i & 3) != 2) {
			outw((unsigned short) 0xDEAD, hw->base_port + IODMADPR);
			i += 2;
		}
		writew(MEMRX_RX, &hw->memory_info_regs->memreg_rx);
	}

	spin_unlock_irqrestore(&hw->spinlock, flags);

	end_write_timing(length);

	return 0;
}

static int do_send_packet(struct ipw_hardware *hw, struct ipw_tx_packet *packet)
{
	unsigned short fragment_data_len;
	unsigned short data_left = packet->length - packet->offset;
	unsigned short header_size;
	union nl_packet pkt;

	header_size =
	    (packet->fragment_count == 0)
	    ? NL_FIRST_PACKET_HEADER_SIZE
	    : NL_FOLLOWING_PACKET_HEADER_SIZE;
	fragment_data_len = hw->ll_mtu - header_size;
	if (data_left < fragment_data_len)
		fragment_data_len = data_left;

	pkt.hdr_first.protocol = packet->protocol;
	pkt.hdr_first.address = packet->dest_addr;
	pkt.hdr_first.packet_rank = 0;

	/* First packet? */
	if (packet->fragment_count == 0) {
		pkt.hdr_first.packet_rank |= NL_FIRST_PACKET;
		pkt.hdr_first.length_lsb = (unsigned char) packet->length;
		pkt.hdr_first.length_msb =
			(unsigned char) (packet->length >> 8);
	}

	memcpy(pkt.rawpkt + header_size,
	       ((unsigned char *) packet) + sizeof(struct ipw_tx_packet) +
	       packet->offset, fragment_data_len);
	packet->offset += fragment_data_len;
	packet->fragment_count++;

	/* Last packet? (May also be first packet.) */
	if (packet->offset == packet->length)
		pkt.hdr_first.packet_rank |= NL_LAST_PACKET;
	do_send_fragment(hw, pkt.rawpkt, header_size + fragment_data_len);

	/* If this packet has unsent data, then re-queue it. */
	if (packet->offset < packet->length) {
		/*
		 * Re-queue it at the head of the highest priority queue so
		 * it goes before all other packets
		 */
		unsigned long flags;

		spin_lock_irqsave(&hw->spinlock, flags);
		list_add(&packet->queue, &hw->tx_queue[0]);
		hw->tx_queued++;
		spin_unlock_irqrestore(&hw->spinlock, flags);
	} else {
		if (packet->packet_callback)
			packet->packet_callback(packet->callback_data,
					packet->length);
		kfree(packet);
	}

	return 0;
}

static void ipw_setup_hardware(struct ipw_hardware *hw)
{
	unsigned long flags;

	spin_lock_irqsave(&hw->spinlock, flags);
	if (hw->hw_version == HW_VERSION_1) {
		/* Reset RX FIFO */
		outw(DCR_RXRESET, hw->base_port + IODCR);
		/* SB: Reset TX FIFO */
		outw(DCR_TXRESET, hw->base_port + IODCR);

		/* Enable TX and RX interrupts. */
		outw(IER_TXENABLED | IER_RXENABLED, hw->base_port + IOIER);
	} else {
		/*
		 * Set INTRACK bit (bit 0), which means we must explicitly
		 * acknowledge interrupts by clearing bit 2 of reg_config_and_status.
		 */
		unsigned short csr = readw(&hw->memregs_CCR->reg_config_and_status);

		csr |= 1;
		writew(csr, &hw->memregs_CCR->reg_config_and_status);
	}
	spin_unlock_irqrestore(&hw->spinlock, flags);
}

/*
 * If 'packet' is NULL, then this function allocates a new packet, setting its
 * length to 0 and ensuring it has the specified minimum amount of free space.
 *
 * If 'packet' is not NULL, then this function enlarges it if it doesn't
 * have the specified minimum amount of free space.
 *
 */
static struct ipw_rx_packet *pool_allocate(struct ipw_hardware *hw,
					   struct ipw_rx_packet *packet,
					   int minimum_free_space)
{

	if (!packet) {
		unsigned long flags;

		/*
		 * If this is the first fragment, then we will need to fetch a
		 * packet to put it in.
		 */
		spin_lock_irqsave(&hw->spinlock, flags);
		/* If we have one in our pool, then pull it out. */
		if (!list_empty(&hw->rx_pool)) {
			packet = list_first_entry(&hw->rx_pool,
					struct ipw_rx_packet, queue);
			list_del(&packet->queue);
			hw->rx_pool_size--;
			spin_unlock_irqrestore(&hw->spinlock, flags);
		} else {
			/* Otherwise allocate a new one. */
			static int min_capacity = 256;
			int new_capacity;

			spin_unlock_irqrestore(&hw->spinlock, flags);
			new_capacity =
			    minimum_free_space > min_capacity
			    ? minimum_free_space
			    : min_capacity;
			packet = kmalloc(sizeof(struct ipw_rx_packet)
					+ new_capacity, GFP_ATOMIC);
			if (!packet)
				return NULL;
			packet->capacity = new_capacity;
		}
		packet->length = 0;
	}

	/*
	 * If this packet does not have sufficient capacity for the data we
	 * want to add, then make it bigger.
	 */
	if (packet->length + minimum_free_space > packet->capacity) {
		struct ipw_rx_packet *old_packet = packet;

		packet = kmalloc(sizeof(struct ipw_rx_packet) +
				old_packet->length + minimum_free_space,
				GFP_ATOMIC);
		if (!packet) {
			kfree(old_packet);
			return NULL;
		}
		memcpy(packet, old_packet,
				sizeof(struct ipw_rx_packet)
					+ old_packet->length);
		packet->capacity = old_packet->length + minimum_free_space;
		kfree(old_packet);
	}

	return packet;
}

static void pool_free(struct ipw_hardware *hw, struct ipw_rx_packet *packet)
{
	if (hw->rx_pool_size > 6)
		kfree(packet);
	else {
		hw->rx_pool_size++;
		list_add_tail(&packet->queue, &hw->rx_pool);
	}
}

static void queue_received_packet(struct ipw_hardware *hw,
				  unsigned int protocol, unsigned int address,
				  unsigned char *data, int length, int is_last)
{
	unsigned int channel_idx = address - 1;
	struct ipw_rx_packet *packet = NULL;
	unsigned long flags;

	/* Discard packet if channel index is out of range. */
	if (channel_idx >= NL_NUM_OF_ADDRESSES) {
		printk(KERN_INFO IPWIRELESS_PCCARD_NAME
		       ": data packet has bad address %u\n", address);
		return;
	}

	/*
	 * ->packet_assembler is safe to touch unlocked, this is the only place
	 */
	if (protocol == TL_PROTOCOLID_COM_DATA) {
		struct ipw_rx_packet **assem =
			&hw->packet_assembler[channel_idx];

		/*
		 * Create a new packet, or assembler already contains one
		 * enlarge it by 'length' bytes.
		 */
		(*assem) = pool_allocate(hw, *assem, length);
		if (!(*assem)) {
			printk(KERN_ERR IPWIRELESS_PCCARD_NAME
				": no memory for incomming data packet, dropped!\n");
			return;
		}
		(*assem)->protocol = protocol;
		(*assem)->channel_idx = channel_idx;

		/* Append this packet data onto existing data. */
		memcpy((unsigned char *)(*assem) +
			       sizeof(struct ipw_rx_packet)
				+ (*assem)->length, data, length);
		(*assem)->length += length;
		if (is_last) {
			packet = *assem;
			*assem = NULL;
			/* Count queued DATA bytes only */
			spin_lock_irqsave(&hw->spinlock, flags);
			hw->rx_bytes_queued += packet->length;
			spin_unlock_irqrestore(&hw->spinlock, flags);
		}
	} else {
		/* If it's a CTRL packet, don't assemble, just queue it. */
		packet = pool_allocate(hw, NULL, length);
		if (!packet) {
			printk(KERN_ERR IPWIRELESS_PCCARD_NAME
				": no memory for incomming ctrl packet, dropped!\n");
			return;
		}
		packet->protocol = protocol;
		packet->channel_idx = channel_idx;
		memcpy((unsigned char *)packet + sizeof(struct ipw_rx_packet),
				data, length);
		packet->length = length;
	}

	/*
	 * If this is the last packet, then send the assembled packet on to the
	 * network layer.
	 */
	if (packet) {
		spin_lock_irqsave(&hw->spinlock, flags);
		list_add_tail(&packet->queue, &hw->rx_queue);
		/* Block reception of incoming packets if queue is full. */
		hw->blocking_rx =
			hw->rx_bytes_queued >= IPWIRELESS_RX_QUEUE_SIZE;

		spin_unlock_irqrestore(&hw->spinlock, flags);
		schedule_work(&hw->work_rx);
	}
}

/*
 * Workqueue callback
 */
static void ipw_receive_data_work(struct work_struct *work_rx)
{
	struct ipw_hardware *hw =
	    container_of(work_rx, struct ipw_hardware, work_rx);
	unsigned long flags;

	spin_lock_irqsave(&hw->spinlock, flags);
	while (!list_empty(&hw->rx_queue)) {
		struct ipw_rx_packet *packet =
			list_first_entry(&hw->rx_queue,
					struct ipw_rx_packet, queue);

		if (hw->shutting_down)
			break;
		list_del(&packet->queue);

		/*
		 * Note: ipwireless_network_packet_received must be called in a
		 * process context (i.e. via schedule_work) because the tty
		 * output code can sleep in the tty_flip_buffer_push call.
		 */
		if (packet->protocol == TL_PROTOCOLID_COM_DATA) {
			if (hw->network != NULL) {
				/* If the network hasn't been disconnected. */
				spin_unlock_irqrestore(&hw->spinlock, flags);
				/*
				 * This must run unlocked due to tty processing
				 * and mutex locking
				 */
				ipwireless_network_packet_received(
						hw->network,
						packet->channel_idx,
						(unsigned char *)packet
						+ sizeof(struct ipw_rx_packet),
						packet->length);
				spin_lock_irqsave(&hw->spinlock, flags);
			}
			/* Count queued DATA bytes only */
			hw->rx_bytes_queued -= packet->length;
		} else {
			/*
			 * This is safe to be called locked, callchain does
			 * not block
			 */
			handle_received_CTRL_packet(hw, packet->channel_idx,
					(unsigned char *)packet
					+ sizeof(struct ipw_rx_packet),
					packet->length);
		}
		pool_free(hw, packet);
		/*
		 * Unblock reception of incoming packets if queue is no longer
		 * full.
		 */
		hw->blocking_rx =
			hw->rx_bytes_queued >= IPWIRELESS_RX_QUEUE_SIZE;
		if (hw->shutting_down)
			break;
	}
	spin_unlock_irqrestore(&hw->spinlock, flags);
}

static void handle_received_CTRL_packet(struct ipw_hardware *hw,
					unsigned int channel_idx,
					unsigned char *data, int len)
{
	struct ipw_control_packet_body *body =
		(struct ipw_control_packet_body *) data;
	unsigned int changed_mask;

	if (len != sizeof(struct ipw_control_packet_body)) {
		printk(KERN_INFO IPWIRELESS_PCCARD_NAME
		       ": control packet was %d bytes - wrong size!\n",
		       len);
		return;
	}

	switch (body->sig_no) {
	case COMCTRL_CTS:
		changed_mask = IPW_CONTROL_LINE_CTS;
		break;
	case COMCTRL_DCD:
		changed_mask = IPW_CONTROL_LINE_DCD;
		break;
	case COMCTRL_DSR:
		changed_mask = IPW_CONTROL_LINE_DSR;
		break;
	case COMCTRL_RI:
		changed_mask = IPW_CONTROL_LINE_RI;
		break;
	default:
		changed_mask = 0;
	}

	if (changed_mask != 0) {
		if (body->value)
			hw->control_lines[channel_idx] |= changed_mask;
		else
			hw->control_lines[channel_idx] &= ~changed_mask;
		if (hw->network)
			ipwireless_network_notify_control_line_change(
					hw->network,
					channel_idx,
					hw->control_lines[channel_idx],
					changed_mask);
	}
}

static void handle_received_packet(struct ipw_hardware *hw,
				   union nl_packet *packet,
				   unsigned short len)
{
	unsigned int protocol = packet->hdr.protocol;
	unsigned int address = packet->hdr.address;
	unsigned int header_length;
	unsigned char *data;
	unsigned int data_len;
	int is_last = packet->hdr.packet_rank & NL_LAST_PACKET;

	if (packet->hdr.packet_rank & NL_FIRST_PACKET)
		header_length = NL_FIRST_PACKET_HEADER_SIZE;
	else
		header_length = NL_FOLLOWING_PACKET_HEADER_SIZE;

	data = packet->rawpkt + header_length;
	data_len = len - header_length;
	switch (protocol) {
	case TL_PROTOCOLID_COM_DATA:
	case TL_PROTOCOLID_COM_CTRL:
		queue_received_packet(hw, protocol, address, data, data_len,
				is_last);
		break;
	case TL_PROTOCOLID_SETUP:
		handle_received_SETUP_packet(hw, address, data, data_len,
				is_last);
		break;
	}
}

static void acknowledge_data_read(struct ipw_hardware *hw)
{
	if (hw->hw_version == HW_VERSION_1)
		outw(DCR_RXDONE, hw->base_port + IODCR);
	else
		writew(MEMRX_PCINTACKK,
				&hw->memory_info_regs->memreg_pc_interrupt_ack);
}

/*
 * Retrieve a packet from the IPW hardware.
 */
static void do_receive_packet(struct ipw_hardware *hw)
{
	unsigned len;
	unsigned int i;
	unsigned char pkt[LL_MTU_MAX];

	start_timing();

	if (hw->hw_version == HW_VERSION_1) {
		len = inw(hw->base_port + IODRR);
		if (len > hw->ll_mtu) {
			printk(KERN_INFO IPWIRELESS_PCCARD_NAME
			       ": received a packet of %u bytes - "
			       "longer than the MTU!\n", len);
			outw(DCR_RXDONE | DCR_RXRESET, hw->base_port + IODCR);
			return;
		}

		for (i = 0; i < len; i += 2) {
			__le16 raw_data = inw(hw->base_port + IODRR);
			unsigned short data = le16_to_cpu(raw_data);

			pkt[i] = (unsigned char) data;
			pkt[i + 1] = (unsigned char) (data >> 8);
		}
	} else {
		len = inw(hw->base_port + IODMADPR);
		if (len > hw->ll_mtu) {
			printk(KERN_INFO IPWIRELESS_PCCARD_NAME
			       ": received a packet of %u bytes - "
			       "longer than the MTU!\n", len);
			writew(MEMRX_PCINTACKK,
				&hw->memory_info_regs->memreg_pc_interrupt_ack);
			return;
		}

		for (i = 0; i < len; i += 2) {
			__le16 raw_data = inw(hw->base_port + IODMADPR);
			unsigned short data = le16_to_cpu(raw_data);

			pkt[i] = (unsigned char) data;
			pkt[i + 1] = (unsigned char) (data >> 8);
		}

		while ((i & 3) != 2) {
			inw(hw->base_port + IODMADPR);
			i += 2;
		}
	}

	acknowledge_data_read(hw);

	if (ipwireless_debug)
		dump_data_bytes("recv", pkt, len);

	handle_received_packet(hw, (union nl_packet *) pkt, len);

	end_read_timing(len);
}

static int get_current_packet_priority(struct ipw_hardware *hw)
{
	/*
	 * If we're initializing, don't send anything of higher priority than
	 * PRIO_SETUP.  The network layer therefore need not care about
	 * hardware initialization - any of its stuff will simply be queued
	 * until setup is complete.
	 */
	return (hw->to_setup || hw->initializing
			? PRIO_SETUP + 1 :
			NL_NUM_OF_PRIORITIES);
}

/*
 * return 1 if something has been received from hw
 */
static int get_packets_from_hw(struct ipw_hardware *hw)
{
	int received = 0;
	unsigned long flags;

	spin_lock_irqsave(&hw->spinlock, flags);
	while (hw->rx_ready && !hw->blocking_rx) {
		received = 1;
		hw->rx_ready--;
		spin_unlock_irqrestore(&hw->spinlock, flags);

		do_receive_packet(hw);

		spin_lock_irqsave(&hw->spinlock, flags);
	}
	spin_unlock_irqrestore(&hw->spinlock, flags);

	return received;
}

/*
 * Send pending packet up to given priority, prioritize SETUP data until
 * hardware is fully setup.
 *
 * return 1 if more packets can be sent
 */
static int send_pending_packet(struct ipw_hardware *hw, int priority_limit)
{
	int more_to_send = 0;
	unsigned long flags;

	spin_lock_irqsave(&hw->spinlock, flags);
	if (hw->tx_queued && hw->tx_ready) {
		int priority;
		struct ipw_tx_packet *packet = NULL;

		/* Pick a packet */
		for (priority = 0; priority < priority_limit; priority++) {
			if (!list_empty(&hw->tx_queue[priority])) {
				packet = list_first_entry(
						&hw->tx_queue[priority],
						struct ipw_tx_packet,
						queue);

				hw->tx_queued--;
				list_del(&packet->queue);

				break;
			}
		}
		if (!packet) {
			hw->tx_queued = 0;
			spin_unlock_irqrestore(&hw->spinlock, flags);
			return 0;
		}

		spin_unlock_irqrestore(&hw->spinlock, flags);

		/* Send */
		do_send_packet(hw, packet);

		/* Check if more to send */
		spin_lock_irqsave(&hw->spinlock, flags);
		for (priority = 0; priority < priority_limit; priority++)
			if (!list_empty(&hw->tx_queue[priority])) {
				more_to_send = 1;
				break;
			}

		if (!more_to_send)
			hw->tx_queued = 0;
	}
	spin_unlock_irqrestore(&hw->spinlock, flags);

	return more_to_send;
}

/*
 * Send and receive all queued packets.
 */
static void ipwireless_do_tasklet(unsigned long hw_)
{
	struct ipw_hardware *hw = (struct ipw_hardware *) hw_;
	unsigned long flags;

	spin_lock_irqsave(&hw->spinlock, flags);
	if (hw->shutting_down) {
		spin_unlock_irqrestore(&hw->spinlock, flags);
		return;
	}

	if (hw->to_setup == 1) {
		/*
		 * Initial setup data sent to hardware
		 */
		hw->to_setup = 2;
		spin_unlock_irqrestore(&hw->spinlock, flags);

		ipw_setup_hardware(hw);
		ipw_send_setup_packet(hw);

		send_pending_packet(hw, PRIO_SETUP + 1);
		get_packets_from_hw(hw);
	} else {
		int priority_limit = get_current_packet_priority(hw);
		int again;

		spin_unlock_irqrestore(&hw->spinlock, flags);

		do {
			again = send_pending_packet(hw, priority_limit);
			again |= get_packets_from_hw(hw);
		} while (again);
	}
}

/*
 * return true if the card is physically present.
 */
static int is_card_present(struct ipw_hardware *hw)
{
	if (hw->hw_version == HW_VERSION_1)
		return inw(hw->base_port + IOIR) != 0xFFFF;
	else
		return readl(&hw->memory_info_regs->memreg_card_present) ==
		    CARD_PRESENT_VALUE;
}

static irqreturn_t ipwireless_handle_v1_interrupt(int irq,
						  struct ipw_hardware *hw)
{
	unsigned short irqn;

	irqn = inw(hw->base_port + IOIR);

	/* Check if card is present */
	if (irqn == 0xFFFF)
		return IRQ_NONE;
	else if (irqn != 0) {
		unsigned short ack = 0;
		unsigned long flags;

		/* Transmit complete. */
		if (irqn & IR_TXINTR) {
			ack |= IR_TXINTR;
			spin_lock_irqsave(&hw->spinlock, flags);
			hw->tx_ready = 1;
			spin_unlock_irqrestore(&hw->spinlock, flags);
		}
		/* Received data */
		if (irqn & IR_RXINTR) {
			ack |= IR_RXINTR;
			spin_lock_irqsave(&hw->spinlock, flags);
			hw->rx_ready++;
			spin_unlock_irqrestore(&hw->spinlock, flags);
		}
		if (ack != 0) {
			outw(ack, hw->base_port + IOIR);
			tasklet_schedule(&hw->tasklet);
		}
		return IRQ_HANDLED;
	}
	return IRQ_NONE;
}

static void acknowledge_pcmcia_interrupt(struct ipw_hardware *hw)
{
	unsigned short csr = readw(&hw->memregs_CCR->reg_config_and_status);

	csr &= 0xfffd;
	writew(csr, &hw->memregs_CCR->reg_config_and_status);
}

static irqreturn_t ipwireless_handle_v2_v3_interrupt(int irq,
						     struct ipw_hardware *hw)
{
	int tx = 0;
	int rx = 0;
	int rx_repeat = 0;
	int try_mem_tx_old;
	unsigned long flags;

	do {

	unsigned short memtx = readw(hw->memreg_tx);
	unsigned short memtx_serial;
	unsigned short memrxdone =
		readw(&hw->memory_info_regs->memreg_rx_done);

	try_mem_tx_old = 0;

	/* check whether the interrupt was generated by ipwireless card */
	if (!(memtx & MEMTX_TX) && !(memrxdone & MEMRX_RX_DONE)) {

		/* check if the card uses memreg_tx_old register */
		if (hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
			memtx = readw(&hw->memory_info_regs->memreg_tx_old);
			if (memtx & MEMTX_TX) {
				printk(KERN_INFO IPWIRELESS_PCCARD_NAME
					": Using memreg_tx_old\n");
				hw->memreg_tx =
					&hw->memory_info_regs->memreg_tx_old;
			} else {
				return IRQ_NONE;
			}
		} else {
			return IRQ_NONE;
		}
	}

	/*
	 * See if the card is physically present. Note that while it is
	 * powering up, it appears not to be present.
	 */
	if (!is_card_present(hw)) {
		acknowledge_pcmcia_interrupt(hw);
		return IRQ_HANDLED;
	}

	memtx_serial = memtx & (unsigned short) 0xff00;
	if (memtx & MEMTX_TX) {
		writew(memtx_serial, hw->memreg_tx);

		if (hw->serial_number_detected) {
			if (memtx_serial != hw->last_memtx_serial) {
				hw->last_memtx_serial = memtx_serial;
				spin_lock_irqsave(&hw->spinlock, flags);
				hw->rx_ready++;
				spin_unlock_irqrestore(&hw->spinlock, flags);
				rx = 1;
			} else
				/* Ignore 'Timer Recovery' duplicates. */
				rx_repeat = 1;
		} else {
			/*
			 * If a non-zero serial number is seen, then enable
			 * serial number checking.
			 */
			if (memtx_serial != 0) {
				hw->serial_number_detected = 1;
				printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
					": memreg_tx serial num detected\n");

				spin_lock_irqsave(&hw->spinlock, flags);
				hw->rx_ready++;
				spin_unlock_irqrestore(&hw->spinlock, flags);
			}
			rx = 1;
		}
	}
	if (memrxdone & MEMRX_RX_DONE) {
		writew(0, &hw->memory_info_regs->memreg_rx_done);
		spin_lock_irqsave(&hw->spinlock, flags);
		hw->tx_ready = 1;
		spin_unlock_irqrestore(&hw->spinlock, flags);
		tx = 1;
	}
	if (tx)
		writew(MEMRX_PCINTACKK,
				&hw->memory_info_regs->memreg_pc_interrupt_ack);

	acknowledge_pcmcia_interrupt(hw);

	if (tx || rx)
		tasklet_schedule(&hw->tasklet);
	else if (!rx_repeat) {
		if (hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
			if (hw->serial_number_detected)
				printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
					": spurious interrupt - new_tx mode\n");
			else {
				printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
					": no valid memreg_tx value - "
					"switching to the old memreg_tx\n");
				hw->memreg_tx =
					&hw->memory_info_regs->memreg_tx_old;
				try_mem_tx_old = 1;
			}
		} else
			printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
					": spurious interrupt - old_tx mode\n");
	}

	} while (try_mem_tx_old == 1);

	return IRQ_HANDLED;
}

irqreturn_t ipwireless_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct ipw_hardware *hw = dev_id;

	if (hw->hw_version == HW_VERSION_1)
		return ipwireless_handle_v1_interrupt(irq, hw);
	else
		return ipwireless_handle_v2_v3_interrupt(irq, hw);
}

static void flush_packets_to_hw(struct ipw_hardware *hw)
{
	int priority_limit;
	unsigned long flags;

	spin_lock_irqsave(&hw->spinlock, flags);
	priority_limit = get_current_packet_priority(hw);
	spin_unlock_irqrestore(&hw->spinlock, flags);

	while (send_pending_packet(hw, priority_limit));
}

static void send_packet(struct ipw_hardware *hw, int priority,
			struct ipw_tx_packet *packet)
{
	unsigned long flags;

	spin_lock_irqsave(&hw->spinlock, flags);
	list_add_tail(&packet->queue, &hw->tx_queue[priority]);
	hw->tx_queued++;
	spin_unlock_irqrestore(&hw->spinlock, flags);

	flush_packets_to_hw(hw);
}

/* Create data packet, non-atomic allocation */
static void *alloc_data_packet(int data_size,
				unsigned char dest_addr,
				unsigned char protocol)
{
	struct ipw_tx_packet *packet = kzalloc(
			sizeof(struct ipw_tx_packet) + data_size,
			GFP_ATOMIC);

	if (!packet)
		return NULL;

	INIT_LIST_HEAD(&packet->queue);
	packet->dest_addr = dest_addr;
	packet->protocol = protocol;
	packet->length = data_size;

	return packet;
}

static void *alloc_ctrl_packet(int header_size,
			       unsigned char dest_addr,
			       unsigned char protocol,
			       unsigned char sig_no)
{
	/*
	 * sig_no is located right after ipw_tx_packet struct in every
	 * CTRL or SETUP packets, we can use ipw_control_packet as a
	 * common struct
	 */
	struct ipw_control_packet *packet = kzalloc(header_size, GFP_ATOMIC);

	if (!packet)
		return NULL;

	INIT_LIST_HEAD(&packet->header.queue);
	packet->header.dest_addr = dest_addr;
	packet->header.protocol = protocol;
	packet->header.length = header_size - sizeof(struct ipw_tx_packet);
	packet->body.sig_no = sig_no;

	return packet;
}

int ipwireless_send_packet(struct ipw_hardware *hw, unsigned int channel_idx,
			    unsigned char *data, unsigned int length,
			    void (*callback) (void *cb, unsigned int length),
			    void *callback_data)
{
	struct ipw_tx_packet *packet;

	packet = alloc_data_packet(length,
			       (unsigned char) (channel_idx + 1),
			       TL_PROTOCOLID_COM_DATA);
	if (!packet)
		return -ENOMEM;
	packet->packet_callback = callback;
	packet->callback_data = callback_data;
	memcpy((unsigned char *) packet +
			sizeof(struct ipw_tx_packet), data, length);

	send_packet(hw, PRIO_DATA, packet);
	return 0;
}

static int set_control_line(struct ipw_hardware *hw, int prio,
			   unsigned int channel_idx, int line, int state)
{
	struct ipw_control_packet *packet;
	int protocolid = TL_PROTOCOLID_COM_CTRL;

	if (prio == PRIO_SETUP)
		protocolid = TL_PROTOCOLID_SETUP;

	packet = alloc_ctrl_packet(sizeof(struct ipw_control_packet),
			(unsigned char) (channel_idx + 1),
			protocolid, line);
	if (!packet)
		return -ENOMEM;
	packet->header.length = sizeof(struct ipw_control_packet_body);
	packet->body.value = (unsigned char) (state == 0 ? 0 : 1);
	send_packet(hw, prio, &packet->header);
	return 0;
}


static int set_DTR(struct ipw_hardware *hw, int priority,
		   unsigned int channel_idx, int state)
{
	if (state != 0)
		hw->control_lines[channel_idx] |= IPW_CONTROL_LINE_DTR;
	else
		hw->control_lines[channel_idx] &= ~IPW_CONTROL_LINE_DTR;

	return set_control_line(hw, priority, channel_idx, COMCTRL_DTR, state);
}

static int set_RTS(struct ipw_hardware *hw, int priority,
		   unsigned int channel_idx, int state)
{
	if (state != 0)
		hw->control_lines[channel_idx] |= IPW_CONTROL_LINE_RTS;
	else
		hw->control_lines[channel_idx] &= ~IPW_CONTROL_LINE_RTS;

	return set_control_line(hw, priority, channel_idx, COMCTRL_RTS, state);
}

int ipwireless_set_DTR(struct ipw_hardware *hw, unsigned int channel_idx,
		       int state)
{
	return set_DTR(hw, PRIO_CTRL, channel_idx, state);
}

int ipwireless_set_RTS(struct ipw_hardware *hw, unsigned int channel_idx,
		       int state)
{
	return set_RTS(hw, PRIO_CTRL, channel_idx, state);
}

struct ipw_setup_get_version_query_packet {
	struct ipw_tx_packet header;
	struct tl_setup_get_version_qry body;
};

struct ipw_setup_config_packet {
	struct ipw_tx_packet header;
	struct tl_setup_config_msg body;
};

struct ipw_setup_config_done_packet {
	struct ipw_tx_packet header;
	struct tl_setup_config_done_msg body;
};

struct ipw_setup_open_packet {
	struct ipw_tx_packet header;
	struct tl_setup_open_msg body;
};

struct ipw_setup_info_packet {
	struct ipw_tx_packet header;
	struct tl_setup_info_msg body;
};

struct ipw_setup_reboot_msg_ack {
	struct ipw_tx_packet header;
	struct TlSetupRebootMsgAck body;
};

/* This handles the actual initialization of the card */
static void __handle_setup_get_version_rsp(struct ipw_hardware *hw)
{
	struct ipw_setup_config_packet *config_packet;
	struct ipw_setup_config_done_packet *config_done_packet;
	struct ipw_setup_open_packet *open_packet;
	struct ipw_setup_info_packet *info_packet;
	int port;
	unsigned int channel_idx;

	/* generate config packet */
	for (port = 1; port <= NL_NUM_OF_ADDRESSES; port++) {
		config_packet = alloc_ctrl_packet(
				sizeof(struct ipw_setup_config_packet),
				ADDR_SETUP_PROT,
				TL_PROTOCOLID_SETUP,
				TL_SETUP_SIGNO_CONFIG_MSG);
		if (!config_packet)
			goto exit_nomem;
		config_packet->header.length = sizeof(struct tl_setup_config_msg);
		config_packet->body.port_no = port;
		config_packet->body.prio_data = PRIO_DATA;
		config_packet->body.prio_ctrl = PRIO_CTRL;
		send_packet(hw, PRIO_SETUP, &config_packet->header);
	}
	config_done_packet = alloc_ctrl_packet(
			sizeof(struct ipw_setup_config_done_packet),
			ADDR_SETUP_PROT,
			TL_PROTOCOLID_SETUP,
			TL_SETUP_SIGNO_CONFIG_DONE_MSG);
	if (!config_done_packet)
		goto exit_nomem;
	config_done_packet->header.length = sizeof(struct tl_setup_config_done_msg);
	send_packet(hw, PRIO_SETUP, &config_done_packet->header);

	/* generate open packet */
	for (port = 1; port <= NL_NUM_OF_ADDRESSES; port++) {
		open_packet = alloc_ctrl_packet(
				sizeof(struct ipw_setup_open_packet),
				ADDR_SETUP_PROT,
				TL_PROTOCOLID_SETUP,
				TL_SETUP_SIGNO_OPEN_MSG);
		if (!open_packet)
			goto exit_nomem;
		open_packet->header.length = sizeof(struct tl_setup_open_msg);
		open_packet->body.port_no = port;
		send_packet(hw, PRIO_SETUP, &open_packet->header);
	}
	for (channel_idx = 0;
			channel_idx < NL_NUM_OF_ADDRESSES; channel_idx++) {
		int ret;

		ret = set_DTR(hw, PRIO_SETUP, channel_idx,
			(hw->control_lines[channel_idx] &
			 IPW_CONTROL_LINE_DTR) != 0);
		if (ret) {
			printk(KERN_ERR IPWIRELESS_PCCARD_NAME
					": error setting DTR (%d)\n", ret);
			return;
		}

		set_RTS(hw, PRIO_SETUP, channel_idx,
			(hw->control_lines [channel_idx] &
			 IPW_CONTROL_LINE_RTS) != 0);
		if (ret) {
			printk(KERN_ERR IPWIRELESS_PCCARD_NAME
					": error setting RTS (%d)\n", ret);
			return;
		}
	}
	/*
	 * For NDIS we assume that we are using sync PPP frames, for COM async.
	 * This driver uses NDIS mode too. We don't bother with translation
	 * from async -> sync PPP.
	 */
	info_packet = alloc_ctrl_packet(sizeof(struct ipw_setup_info_packet),
			ADDR_SETUP_PROT,
			TL_PROTOCOLID_SETUP,
			TL_SETUP_SIGNO_INFO_MSG);
	if (!info_packet)
		goto exit_nomem;
	info_packet->header.length = sizeof(struct tl_setup_info_msg);
	info_packet->body.driver_type = NDISWAN_DRIVER;
	info_packet->body.major_version = NDISWAN_DRIVER_MAJOR_VERSION;
	info_packet->body.minor_version = NDISWAN_DRIVER_MINOR_VERSION;
	send_packet(hw, PRIO_SETUP, &info_packet->header);

	/* Initialization is now complete, so we clear the 'to_setup' flag */
	hw->to_setup = 0;

	return;

exit_nomem:
	printk(KERN_ERR IPWIRELESS_PCCARD_NAME
			": not enough memory to alloc control packet\n");
	hw->to_setup = -1;
}

static void handle_setup_get_version_rsp(struct ipw_hardware *hw,
		unsigned char vers_no)
{
	del_timer(&hw->setup_timer);
	hw->initializing = 0;
	printk(KERN_INFO IPWIRELESS_PCCARD_NAME ": card is ready.\n");

	if (vers_no == TL_SETUP_VERSION)
		__handle_setup_get_version_rsp(hw);
	else
		printk(KERN_ERR
				IPWIRELESS_PCCARD_NAME
				": invalid hardware version no %u\n",
				(unsigned int) vers_no);
}

static void ipw_send_setup_packet(struct ipw_hardware *hw)
{
	struct ipw_setup_get_version_query_packet *ver_packet;

	ver_packet = alloc_ctrl_packet(
			sizeof(struct ipw_setup_get_version_query_packet),
			ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
			TL_SETUP_SIGNO_GET_VERSION_QRY);
	ver_packet->header.length = sizeof(struct tl_setup_get_version_qry);

	/*
	 * Response is handled in handle_received_SETUP_packet
	 */
	send_packet(hw, PRIO_SETUP, &ver_packet->header);
}

static void handle_received_SETUP_packet(struct ipw_hardware *hw,
					 unsigned int address,
					 unsigned char *data, int len,
					 int is_last)
{
	union ipw_setup_rx_msg *rx_msg = (union ipw_setup_rx_msg *) data;

	if (address != ADDR_SETUP_PROT) {
		printk(KERN_INFO IPWIRELESS_PCCARD_NAME
		       ": setup packet has bad address %d\n", address);
		return;
	}

	switch (rx_msg->sig_no) {
	case TL_SETUP_SIGNO_GET_VERSION_RSP:
		if (hw->to_setup)
			handle_setup_get_version_rsp(hw,
					rx_msg->version_rsp_msg.version);
		break;

	case TL_SETUP_SIGNO_OPEN_MSG:
		if (ipwireless_debug) {
			unsigned int channel_idx = rx_msg->open_msg.port_no - 1;

			printk(KERN_INFO IPWIRELESS_PCCARD_NAME
			       ": OPEN_MSG [channel %u] reply received\n",
			       channel_idx);
		}
		break;

	case TL_SETUP_SIGNO_INFO_MSG_ACK:
		if (ipwireless_debug)
			printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
			       ": card successfully configured as NDISWAN\n");
		break;

	case TL_SETUP_SIGNO_REBOOT_MSG:
		if (hw->to_setup)
			printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
			       ": Setup not completed - ignoring reboot msg\n");
		else {
			struct ipw_setup_reboot_msg_ack *packet;

			printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
			       ": Acknowledging REBOOT message\n");
			packet = alloc_ctrl_packet(
					sizeof(struct ipw_setup_reboot_msg_ack),
					ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
					TL_SETUP_SIGNO_REBOOT_MSG_ACK);
			packet->header.length =
				sizeof(struct TlSetupRebootMsgAck);
			send_packet(hw, PRIO_SETUP, &packet->header);
			if (hw->reboot_callback)
				hw->reboot_callback(hw->reboot_callback_data);
		}
		break;

	default:
		printk(KERN_INFO IPWIRELESS_PCCARD_NAME
		       ": unknown setup message %u received\n",
		       (unsigned int) rx_msg->sig_no);
	}
}

static void do_close_hardware(struct ipw_hardware *hw)
{
	unsigned int irqn;

	if (hw->hw_version == HW_VERSION_1) {
		/* Disable TX and RX interrupts. */
		outw(0, hw->base_port + IOIER);

		/* Acknowledge any outstanding interrupt requests */
		irqn = inw(hw->base_port + IOIR);
		if (irqn & IR_TXINTR)
			outw(IR_TXINTR, hw->base_port + IOIR);
		if (irqn & IR_RXINTR)
			outw(IR_RXINTR, hw->base_port + IOIR);

		synchronize_irq(hw->irq);
	}
}

struct ipw_hardware *ipwireless_hardware_create(void)
{
	int i;
	struct ipw_hardware *hw =
		kzalloc(sizeof(struct ipw_hardware), GFP_KERNEL);

	if (!hw)
		return NULL;

	hw->irq = -1;
	hw->initializing = 1;
	hw->tx_ready = 1;
	hw->rx_bytes_queued = 0;
	hw->rx_pool_size = 0;
	hw->last_memtx_serial = (unsigned short) 0xffff;
	for (i = 0; i < NL_NUM_OF_PRIORITIES; i++)
		INIT_LIST_HEAD(&hw->tx_queue[i]);

	INIT_LIST_HEAD(&hw->rx_queue);
	INIT_LIST_HEAD(&hw->rx_pool);
	spin_lock_init(&hw->spinlock);
	tasklet_init(&hw->tasklet, ipwireless_do_tasklet, (unsigned long) hw);
	INIT_WORK(&hw->work_rx, ipw_receive_data_work);
	setup_timer(&hw->setup_timer, ipwireless_setup_timer,
			(unsigned long) hw);

	return hw;
}

void ipwireless_init_hardware_v1(struct ipw_hardware *hw,
		unsigned int base_port,
		void __iomem *attr_memory,
		void __iomem *common_memory,
		int is_v2_card,
		void (*reboot_callback) (void *data),
		void *reboot_callback_data)
{
	if (hw->removed) {
		hw->removed = 0;
		enable_irq(hw->irq);
	}
	hw->base_port = base_port;
	hw->hw_version = is_v2_card ? HW_VERSION_2 : HW_VERSION_1;
	hw->ll_mtu = hw->hw_version == HW_VERSION_1 ? LL_MTU_V1 : LL_MTU_V2;
	hw->memregs_CCR = (struct MEMCCR __iomem *)
			((unsigned short __iomem *) attr_memory + 0x200);
	hw->memory_info_regs = (struct MEMINFREG __iomem *) common_memory;
	hw->memreg_tx = &hw->memory_info_regs->memreg_tx_new;
	hw->reboot_callback = reboot_callback;
	hw->reboot_callback_data = reboot_callback_data;
}

void ipwireless_init_hardware_v2_v3(struct ipw_hardware *hw)
{
	hw->initializing = 1;
	hw->init_loops = 0;
	printk(KERN_INFO IPWIRELESS_PCCARD_NAME
	       ": waiting for card to start up...\n");
	ipwireless_setup_timer((unsigned long) hw);
}

static void ipwireless_setup_timer(unsigned long data)
{
	struct ipw_hardware *hw = (struct ipw_hardware *) data;

	hw->init_loops++;

	if (hw->init_loops == TL_SETUP_MAX_VERSION_QRY &&
			hw->hw_version == HW_VERSION_2 &&
			hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
		printk(KERN_INFO IPWIRELESS_PCCARD_NAME
				": failed to startup using TX2, trying TX\n");

		hw->memreg_tx = &hw->memory_info_regs->memreg_tx_old;
		hw->init_loops = 0;
	}
	/* Give up after a certain number of retries */
	if (hw->init_loops == TL_SETUP_MAX_VERSION_QRY) {
		printk(KERN_INFO IPWIRELESS_PCCARD_NAME
		       ": card failed to start up!\n");
		hw->initializing = 0;
	} else {
		/* Do not attempt to write to the board if it is not present. */
		if (is_card_present(hw)) {
			unsigned long flags;

			spin_lock_irqsave(&hw->spinlock, flags);
			hw->to_setup = 1;
			hw->tx_ready = 1;
			spin_unlock_irqrestore(&hw->spinlock, flags);
			tasklet_schedule(&hw->tasklet);
		}

		mod_timer(&hw->setup_timer,
			jiffies + msecs_to_jiffies(TL_SETUP_VERSION_QRY_TMO));
	}
}

/*
 * Stop any interrupts from executing so that, once this function returns,
 * other layers of the driver can be sure they won't get any more callbacks.
 * Thus must be called on a proper process context.
 */
void ipwireless_stop_interrupts(struct ipw_hardware *hw)
{
	if (!hw->shutting_down) {
		/* Tell everyone we are going down. */
		hw->shutting_down = 1;
		del_timer(&hw->setup_timer);

		/* Prevent the hardware from sending any more interrupts */
		do_close_hardware(hw);
	}
}

void ipwireless_hardware_free(struct ipw_hardware *hw)
{
	int i;
	struct ipw_rx_packet *rp, *rq;
	struct ipw_tx_packet *tp, *tq;

	ipwireless_stop_interrupts(hw);

	flush_scheduled_work();

	for (i = 0; i < NL_NUM_OF_ADDRESSES; i++)
		if (hw->packet_assembler[i] != NULL)
			kfree(hw->packet_assembler[i]);

	for (i = 0; i < NL_NUM_OF_PRIORITIES; i++)
		list_for_each_entry_safe(tp, tq, &hw->tx_queue[i], queue) {
			list_del(&tp->queue);
			kfree(tp);
		}

	list_for_each_entry_safe(rp, rq, &hw->rx_queue, queue) {
		list_del(&rp->queue);
		kfree(rp);
	}

	list_for_each_entry_safe(rp, rq, &hw->rx_pool, queue) {
		list_del(&rp->queue);
		kfree(rp);
	}
	kfree(hw);
}

/*
 * Associate the specified network with this hardware, so it will receive events
 * from it.
 */
void ipwireless_associate_network(struct ipw_hardware *hw,
				  struct ipw_network *network)
{
	hw->network = network;
}