summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/mwifiex/sdio.c
blob: 5148d0e0fad6dbf54e74e81b71a32125a110e55a (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
/*
 * Marvell Wireless LAN device driver: SDIO specific handling
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include <linux/firmware.h>

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"
#include "sdio.h"


#define SDIO_VERSION	"1.0"

static struct mwifiex_if_ops sdio_ops;

static struct semaphore add_remove_card_sem;

/*
 * SDIO probe.
 *
 * This function probes an mwifiex device and registers it. It allocates
 * the card structure, enables SDIO function number and initiates the
 * device registration and initialization procedure by adding a logical
 * interface.
 */
static int
mwifiex_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id)
{
	int ret = 0;
	struct sdio_mmc_card *card = NULL;

	pr_debug("info: vendor=0x%4.04X device=0x%4.04X class=%d function=%d\n",
	       func->vendor, func->device, func->class, func->num);

	card = kzalloc(sizeof(struct sdio_mmc_card), GFP_KERNEL);
	if (!card) {
		pr_err("%s: failed to alloc memory\n", __func__);
		return -ENOMEM;
	}

	card->func = func;

	func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;

	sdio_claim_host(func);
	ret = sdio_enable_func(func);
	sdio_release_host(func);

	if (ret) {
		pr_err("%s: failed to enable function\n", __func__);
		return -EIO;
	}

	if (mwifiex_add_card(card, &add_remove_card_sem, &sdio_ops)) {
		pr_err("%s: add card failed\n", __func__);
		kfree(card);
		sdio_claim_host(func);
		ret = sdio_disable_func(func);
		sdio_release_host(func);
		ret = -1;
	}

	return ret;
}

/*
 * SDIO remove.
 *
 * This function removes the interface and frees up the card structure.
 */
static void
mwifiex_sdio_remove(struct sdio_func *func)
{
	struct sdio_mmc_card *card;

	pr_debug("info: SDIO func num=%d\n", func->num);

	if (func) {
		card = sdio_get_drvdata(func);
		if (card) {
			mwifiex_remove_card(card->adapter,
					&add_remove_card_sem);
			kfree(card);
		}
	}
}

/*
 * SDIO suspend.
 *
 * Kernel needs to suspend all functions separately. Therefore all
 * registered functions must have drivers with suspend and resume
 * methods. Failing that the kernel simply removes the whole card.
 *
 * If already not suspended, this function allocates and sends a host
 * sleep activate request to the firmware and turns off the traffic.
 */
static int mwifiex_sdio_suspend(struct device *dev)
{
	struct sdio_func *func = dev_to_sdio_func(dev);
	struct sdio_mmc_card *card;
	struct mwifiex_adapter *adapter = NULL;
	mmc_pm_flag_t pm_flag = 0;
	int hs_actived = 0;
	int i;
	int ret = 0;

	if (func) {
		pm_flag = sdio_get_host_pm_caps(func);
		pr_debug("cmd: %s: suspend: PM flag = 0x%x\n",
		       sdio_func_id(func), pm_flag);
		if (!(pm_flag & MMC_PM_KEEP_POWER)) {
			pr_err("%s: cannot remain alive while host is"
				" suspended\n", sdio_func_id(func));
			return -ENOSYS;
		}

		card = sdio_get_drvdata(func);
		if (!card || !card->adapter) {
			pr_err("suspend: invalid card or adapter\n");
			return 0;
		}
	} else {
		pr_err("suspend: sdio_func is not specified\n");
		return 0;
	}

	adapter = card->adapter;

	/* Enable the Host Sleep */
	hs_actived = mwifiex_enable_hs(adapter);
	if (hs_actived) {
		pr_debug("cmd: suspend with MMC_PM_KEEP_POWER\n");
		ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
	}

	/* Indicate device suspended */
	adapter->is_suspended = true;

	for (i = 0; i < adapter->priv_num; i++)
		netif_carrier_off(adapter->priv[i]->netdev);

	return ret;
}

/*
 * SDIO resume.
 *
 * Kernel needs to suspend all functions separately. Therefore all
 * registered functions must have drivers with suspend and resume
 * methods. Failing that the kernel simply removes the whole card.
 *
 * If already not resumed, this function turns on the traffic and
 * sends a host sleep cancel request to the firmware.
 */
static int mwifiex_sdio_resume(struct device *dev)
{
	struct sdio_func *func = dev_to_sdio_func(dev);
	struct sdio_mmc_card *card;
	struct mwifiex_adapter *adapter = NULL;
	mmc_pm_flag_t pm_flag = 0;
	int i;

	if (func) {
		pm_flag = sdio_get_host_pm_caps(func);
		card = sdio_get_drvdata(func);
		if (!card || !card->adapter) {
			pr_err("resume: invalid card or adapter\n");
			return 0;
		}
	} else {
		pr_err("resume: sdio_func is not specified\n");
		return 0;
	}

	adapter = card->adapter;

	if (!adapter->is_suspended) {
		dev_warn(adapter->dev, "device already resumed\n");
		return 0;
	}

	adapter->is_suspended = false;

	for (i = 0; i < adapter->priv_num; i++)
		if (adapter->priv[i]->media_connected)
			netif_carrier_on(adapter->priv[i]->netdev);

	/* Disable Host Sleep */
	mwifiex_cancel_hs(mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
			  MWIFIEX_ASYNC_CMD);

	return 0;
}

/* Device ID for SD8787 */
#define SDIO_DEVICE_ID_MARVELL_8787   (0x9119)

/* WLAN IDs */
static const struct sdio_device_id mwifiex_ids[] = {
	{SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8787)},
	{},
};

MODULE_DEVICE_TABLE(sdio, mwifiex_ids);

static const struct dev_pm_ops mwifiex_sdio_pm_ops = {
	.suspend = mwifiex_sdio_suspend,
	.resume = mwifiex_sdio_resume,
};

static struct sdio_driver mwifiex_sdio = {
	.name = "mwifiex_sdio",
	.id_table = mwifiex_ids,
	.probe = mwifiex_sdio_probe,
	.remove = mwifiex_sdio_remove,
	.drv = {
		.owner = THIS_MODULE,
		.pm = &mwifiex_sdio_pm_ops,
	}
};

/*
 * This function writes data into SDIO card register.
 */
static int
mwifiex_write_reg(struct mwifiex_adapter *adapter, u32 reg, u32 data)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret = -1;

	sdio_claim_host(card->func);
	sdio_writeb(card->func, (u8) data, reg, &ret);
	sdio_release_host(card->func);

	return ret;
}

/*
 * This function reads data from SDIO card register.
 */
static int
mwifiex_read_reg(struct mwifiex_adapter *adapter, u32 reg, u32 *data)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret = -1;
	u8 val;

	sdio_claim_host(card->func);
	val = sdio_readb(card->func, reg, &ret);
	sdio_release_host(card->func);

	*data = val;

	return ret;
}

/*
 * This function writes multiple data into SDIO card memory.
 *
 * This does not work in suspended mode.
 */
static int
mwifiex_write_data_sync(struct mwifiex_adapter *adapter,
			u8 *buffer, u32 pkt_len, u32 port)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret = -1;
	u8 blk_mode =
		(port & MWIFIEX_SDIO_BYTE_MODE_MASK) ? BYTE_MODE : BLOCK_MODE;
	u32 blk_size = (blk_mode == BLOCK_MODE) ? MWIFIEX_SDIO_BLOCK_SIZE : 1;
	u32 blk_cnt =
		(blk_mode ==
		 BLOCK_MODE) ? (pkt_len /
				MWIFIEX_SDIO_BLOCK_SIZE) : pkt_len;
	u32 ioport = (port & MWIFIEX_SDIO_IO_PORT_MASK);

	if (adapter->is_suspended) {
		dev_err(adapter->dev,
			"%s: not allowed while suspended\n", __func__);
		return -1;
	}

	sdio_claim_host(card->func);

	if (!sdio_writesb(card->func, ioport, buffer, blk_cnt * blk_size))
		ret = 0;

	sdio_release_host(card->func);

	return ret;
}

/*
 * This function reads multiple data from SDIO card memory.
 */
static int mwifiex_read_data_sync(struct mwifiex_adapter *adapter, u8 *buffer,
				  u32 len, u32 port, u8 claim)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret = -1;
	u8 blk_mode =
		(port & MWIFIEX_SDIO_BYTE_MODE_MASK) ? BYTE_MODE : BLOCK_MODE;
	u32 blk_size = (blk_mode == BLOCK_MODE) ? MWIFIEX_SDIO_BLOCK_SIZE : 1;
	u32 blk_cnt =
		(blk_mode ==
		 BLOCK_MODE) ? (len / MWIFIEX_SDIO_BLOCK_SIZE) : len;
	u32 ioport = (port & MWIFIEX_SDIO_IO_PORT_MASK);

	if (claim)
		sdio_claim_host(card->func);

	if (!sdio_readsb(card->func, buffer, ioport, blk_cnt * blk_size))
		ret = 0;

	if (claim)
		sdio_release_host(card->func);

	return ret;
}

/*
 * This function wakes up the card.
 *
 * A host power up command is written to the card configuration
 * register to wake up the card.
 */
static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
{
	dev_dbg(adapter->dev, "event: wakeup device...\n");

	return mwifiex_write_reg(adapter, CONFIGURATION_REG, HOST_POWER_UP);
}

/*
 * This function is called after the card has woken up.
 *
 * The card configuration register is reset.
 */
static int mwifiex_pm_wakeup_card_complete(struct mwifiex_adapter *adapter)
{
	dev_dbg(adapter->dev, "cmd: wakeup device completed\n");

	return mwifiex_write_reg(adapter, CONFIGURATION_REG, 0);
}

/*
 * This function initializes the IO ports.
 *
 * The following operations are performed -
 *      - Read the IO ports (0, 1 and 2)
 *      - Set host interrupt Reset-To-Read to clear
 *      - Set auto re-enable interrupt
 */
static int mwifiex_init_sdio_ioport(struct mwifiex_adapter *adapter)
{
	u32 reg;

	adapter->ioport = 0;

	/* Read the IO port */
	if (!mwifiex_read_reg(adapter, IO_PORT_0_REG, &reg))
		adapter->ioport |= (reg & 0xff);
	else
		return -1;

	if (!mwifiex_read_reg(adapter, IO_PORT_1_REG, &reg))
		adapter->ioport |= ((reg & 0xff) << 8);
	else
		return -1;

	if (!mwifiex_read_reg(adapter, IO_PORT_2_REG, &reg))
		adapter->ioport |= ((reg & 0xff) << 16);
	else
		return -1;

	pr_debug("info: SDIO FUNC1 IO port: %#x\n", adapter->ioport);

	/* Set Host interrupt reset to read to clear */
	if (!mwifiex_read_reg(adapter, HOST_INT_RSR_REG, &reg))
		mwifiex_write_reg(adapter, HOST_INT_RSR_REG,
				  reg | SDIO_INT_MASK);
	else
		return -1;

	/* Dnld/Upld ready set to auto reset */
	if (!mwifiex_read_reg(adapter, CARD_MISC_CFG_REG, &reg))
		mwifiex_write_reg(adapter, CARD_MISC_CFG_REG,
				  reg | AUTO_RE_ENABLE_INT);
	else
		return -1;

	return 0;
}

/*
 * This function sends data to the card.
 */
static int mwifiex_write_data_to_card(struct mwifiex_adapter *adapter,
				      u8 *payload, u32 pkt_len, u32 port)
{
	u32 i = 0;
	int ret = 0;

	do {
		ret = mwifiex_write_data_sync(adapter, payload, pkt_len, port);
		if (ret) {
			i++;
			dev_err(adapter->dev, "host_to_card, write iomem"
					" (%d) failed: %d\n", i, ret);
			if (mwifiex_write_reg(adapter,
					CONFIGURATION_REG, 0x04))
				dev_err(adapter->dev, "write CFG reg failed\n");

			ret = -1;
			if (i > MAX_WRITE_IOMEM_RETRY)
				return ret;
		}
	} while (ret == -1);

	return ret;
}

/*
 * This function gets the read port.
 *
 * If control port bit is set in MP read bitmap, the control port
 * is returned, otherwise the current read port is returned and
 * the value is increased (provided it does not reach the maximum
 * limit, in which case it is reset to 1)
 */
static int mwifiex_get_rd_port(struct mwifiex_adapter *adapter, u8 *port)
{
	struct sdio_mmc_card *card = adapter->card;
	u16 rd_bitmap = card->mp_rd_bitmap;

	dev_dbg(adapter->dev, "data: mp_rd_bitmap=0x%04x\n", rd_bitmap);

	if (!(rd_bitmap & (CTRL_PORT_MASK | DATA_PORT_MASK)))
		return -1;

	if (card->mp_rd_bitmap & CTRL_PORT_MASK) {
		card->mp_rd_bitmap &= (u16) (~CTRL_PORT_MASK);
		*port = CTRL_PORT;
		dev_dbg(adapter->dev, "data: port=%d mp_rd_bitmap=0x%04x\n",
		       *port, card->mp_rd_bitmap);
	} else {
		if (card->mp_rd_bitmap & (1 << card->curr_rd_port)) {
			card->mp_rd_bitmap &=
				(u16) (~(1 << card->curr_rd_port));
			*port = card->curr_rd_port;

			if (++card->curr_rd_port == MAX_PORT)
				card->curr_rd_port = 1;
		} else {
			return -1;
		}

		dev_dbg(adapter->dev,
			"data: port=%d mp_rd_bitmap=0x%04x -> 0x%04x\n",
		       *port, rd_bitmap, card->mp_rd_bitmap);
	}
	return 0;
}

/*
 * This function gets the write port for data.
 *
 * The current write port is returned if available and the value is
 * increased (provided it does not reach the maximum limit, in which
 * case it is reset to 1)
 */
static int mwifiex_get_wr_port_data(struct mwifiex_adapter *adapter, u8 *port)
{
	struct sdio_mmc_card *card = adapter->card;
	u16 wr_bitmap = card->mp_wr_bitmap;

	dev_dbg(adapter->dev, "data: mp_wr_bitmap=0x%04x\n", wr_bitmap);

	if (!(wr_bitmap & card->mp_data_port_mask))
		return -1;

	if (card->mp_wr_bitmap & (1 << card->curr_wr_port)) {
		card->mp_wr_bitmap &= (u16) (~(1 << card->curr_wr_port));
		*port = card->curr_wr_port;
		if (++card->curr_wr_port == card->mp_end_port)
			card->curr_wr_port = 1;
	} else {
		adapter->data_sent = true;
		return -EBUSY;
	}

	if (*port == CTRL_PORT) {
		dev_err(adapter->dev, "invalid data port=%d cur port=%d"
				" mp_wr_bitmap=0x%04x -> 0x%04x\n",
				*port, card->curr_wr_port, wr_bitmap,
				card->mp_wr_bitmap);
		return -1;
	}

	dev_dbg(adapter->dev, "data: port=%d mp_wr_bitmap=0x%04x -> 0x%04x\n",
	       *port, wr_bitmap, card->mp_wr_bitmap);

	return 0;
}

/*
 * This function polls the card status.
 */
static int
mwifiex_sdio_poll_card_status(struct mwifiex_adapter *adapter, u8 bits)
{
	u32 tries;
	u32 cs = 0;

	for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
		if (mwifiex_read_reg(adapter, CARD_STATUS_REG, &cs))
			break;
		else if ((cs & bits) == bits)
			return 0;

		udelay(10);
	}

	dev_err(adapter->dev, "poll card status failed, tries = %d\n",
	       tries);
	return -1;
}

/*
 * This function reads the firmware status.
 */
static int
mwifiex_sdio_read_fw_status(struct mwifiex_adapter *adapter, u16 *dat)
{
	u32 fws0 = 0, fws1 = 0;

	if (mwifiex_read_reg(adapter, CARD_FW_STATUS0_REG, &fws0))
		return -1;

	if (mwifiex_read_reg(adapter, CARD_FW_STATUS1_REG, &fws1))
		return -1;

	*dat = (u16) ((fws1 << 8) | fws0);

	return 0;
}

/*
 * This function disables the host interrupt.
 *
 * The host interrupt mask is read, the disable bit is reset and
 * written back to the card host interrupt mask register.
 */
static int mwifiex_sdio_disable_host_int(struct mwifiex_adapter *adapter)
{
	u32 host_int_mask = 0;

	/* Read back the host_int_mask register */
	if (mwifiex_read_reg(adapter, HOST_INT_MASK_REG, &host_int_mask))
		return -1;

	/* Update with the mask and write back to the register */
	host_int_mask &= ~HOST_INT_DISABLE;

	if (mwifiex_write_reg(adapter, HOST_INT_MASK_REG, host_int_mask)) {
		dev_err(adapter->dev, "disable host interrupt failed\n");
		return -1;
	}

	return 0;
}

/*
 * This function enables the host interrupt.
 *
 * The host interrupt enable mask is written to the card
 * host interrupt mask register.
 */
static int mwifiex_sdio_enable_host_int(struct mwifiex_adapter *adapter)
{
	/* Simply write the mask to the register */
	if (mwifiex_write_reg(adapter, HOST_INT_MASK_REG, HOST_INT_ENABLE)) {
		dev_err(adapter->dev, "enable host interrupt failed\n");
		return -1;
	}
	return 0;
}

/*
 * This function sends a data buffer to the card.
 */
static int mwifiex_sdio_card_to_host(struct mwifiex_adapter *adapter,
				     u32 *type, u8 *buffer,
				     u32 npayload, u32 ioport)
{
	int ret = 0;
	u32 nb;

	if (!buffer) {
		dev_err(adapter->dev, "%s: buffer is NULL\n", __func__);
		return -1;
	}

	ret = mwifiex_read_data_sync(adapter, buffer, npayload, ioport, 1);

	if (ret) {
		dev_err(adapter->dev, "%s: read iomem failed: %d\n", __func__,
				ret);
		return -1;
	}

	nb = le16_to_cpu(*(__le16 *) (buffer));
	if (nb > npayload) {
		dev_err(adapter->dev, "%s: invalid packet, nb=%d, npayload=%d\n",
				__func__, nb, npayload);
		return -1;
	}

	*type = le16_to_cpu(*(__le16 *) (buffer + 2));

	return ret;
}

/*
 * This function downloads the firmware to the card.
 *
 * Firmware is downloaded to the card in blocks. Every block download
 * is tested for CRC errors, and retried a number of times before
 * returning failure.
 */
static int mwifiex_prog_fw_w_helper(struct mwifiex_adapter *adapter,
				    struct mwifiex_fw_image *fw)
{
	int ret = 0;
	u8 *firmware = fw->fw_buf;
	u32 firmware_len = fw->fw_len;
	u32 offset = 0;
	u32 base0, base1;
	u8 *fwbuf;
	u16 len = 0;
	u32 txlen = 0, tx_blocks = 0, tries = 0;
	u32 i = 0;

	if (!firmware_len) {
		dev_err(adapter->dev, "firmware image not found!"
				" Terminating download\n");
		return -1;
	}

	dev_dbg(adapter->dev, "info: downloading FW image (%d bytes)\n",
			firmware_len);

	/* Assume that the allocated buffer is 8-byte aligned */
	fwbuf = kzalloc(MWIFIEX_UPLD_SIZE, GFP_KERNEL);
	if (!fwbuf) {
		dev_err(adapter->dev, "unable to alloc buffer for firmware."
				" Terminating download\n");
		return -1;
	}

	/* Perform firmware data transfer */
	do {
		/* The host polls for the DN_LD_CARD_RDY and CARD_IO_READY
		   bits */
		ret = mwifiex_sdio_poll_card_status(adapter, CARD_IO_READY |
						    DN_LD_CARD_RDY);
		if (ret) {
			dev_err(adapter->dev, "FW download with helper:"
					" poll status timeout @ %d\n", offset);
			goto done;
		}

		/* More data? */
		if (offset >= firmware_len)
			break;

		for (tries = 0; tries < MAX_POLL_TRIES; tries++) {
			ret = mwifiex_read_reg(adapter, HOST_F1_RD_BASE_0,
					       &base0);
			if (ret) {
				dev_err(adapter->dev, "dev BASE0 register read"
					" failed: base0=0x%04X(%d). Terminating "
				       "download\n", base0, base0);
				goto done;
			}
			ret = mwifiex_read_reg(adapter, HOST_F1_RD_BASE_1,
					       &base1);
			if (ret) {
				dev_err(adapter->dev, "dev BASE1 register read"
					" failed: base1=0x%04X(%d). Terminating "
				       "download\n", base1, base1);
				goto done;
			}
			len = (u16) (((base1 & 0xff) << 8) | (base0 & 0xff));

			if (len)
				break;

			udelay(10);
		}

		if (!len) {
			break;
		} else if (len > MWIFIEX_UPLD_SIZE) {
			dev_err(adapter->dev, "FW download failed @ %d,"
				" invalid length %d\n", offset, len);
			ret = -1;
			goto done;
		}

		txlen = len;

		if (len & BIT(0)) {
			i++;
			if (i > MAX_WRITE_IOMEM_RETRY) {
				dev_err(adapter->dev, "FW download failed @"
					" %d, over max retry count\n", offset);
				ret = -1;
				goto done;
			}
			dev_err(adapter->dev, "CRC indicated by the helper:"
			       " len = 0x%04X, txlen = %d\n", len, txlen);
			len &= ~BIT(0);
			/* Setting this to 0 to resend from same offset */
			txlen = 0;
		} else {
			i = 0;

			/* Set blocksize to transfer - checking for last
			   block */
			if (firmware_len - offset < txlen)
				txlen = firmware_len - offset;

			tx_blocks = (txlen + MWIFIEX_SDIO_BLOCK_SIZE -
					1) / MWIFIEX_SDIO_BLOCK_SIZE;

			/* Copy payload to buffer */
			memmove(fwbuf, &firmware[offset], txlen);
		}

		ret = mwifiex_write_data_sync(adapter, fwbuf, tx_blocks *
					      MWIFIEX_SDIO_BLOCK_SIZE,
					      adapter->ioport);
		if (ret) {
			dev_err(adapter->dev, "FW download, write iomem (%d)"
					" failed @ %d\n", i, offset);
			if (mwifiex_write_reg(adapter, CONFIGURATION_REG, 0x04))
				dev_err(adapter->dev, "write CFG reg failed\n");

			ret = -1;
			goto done;
		}

		offset += txlen;
	} while (true);

	dev_dbg(adapter->dev, "info: FW download over, size %d bytes\n",
						offset);

	ret = 0;
done:
	kfree(fwbuf);
	return ret;
}

/*
 * This function checks the firmware status in card.
 *
 * The winner interface is also determined by this function.
 */
static int mwifiex_check_fw_status(struct mwifiex_adapter *adapter,
				   u32 poll_num, int *winner)
{
	int ret = 0;
	u16 firmware_stat;
	u32 tries;
	u32 winner_status;

	/* Wait for firmware initialization event */
	for (tries = 0; tries < poll_num; tries++) {
		ret = mwifiex_sdio_read_fw_status(adapter, &firmware_stat);
		if (ret)
			continue;
		if (firmware_stat == FIRMWARE_READY) {
			ret = 0;
			break;
		} else {
			mdelay(100);
			ret = -1;
		}
	}

	if (winner && ret) {
		if (mwifiex_read_reg
		    (adapter, CARD_FW_STATUS0_REG, &winner_status))
			winner_status = 0;

		if (winner_status)
			*winner = 0;
		else
			*winner = 1;
	}
	return ret;
}

/*
 * This function reads the interrupt status from card.
 */
static void mwifiex_interrupt_status(struct mwifiex_adapter *adapter)
{
	struct sdio_mmc_card *card = adapter->card;
	u32 sdio_ireg = 0;
	unsigned long flags;

	if (mwifiex_read_data_sync(adapter, card->mp_regs, MAX_MP_REGS,
				   REG_PORT | MWIFIEX_SDIO_BYTE_MODE_MASK,
				   0)) {
		dev_err(adapter->dev, "read mp_regs failed\n");
		return;
	}

	sdio_ireg = card->mp_regs[HOST_INTSTATUS_REG];
	if (sdio_ireg) {
		/*
		 * DN_LD_HOST_INT_STATUS and/or UP_LD_HOST_INT_STATUS
		 * Clear the interrupt status register
		 */
		dev_dbg(adapter->dev, "int: sdio_ireg = %#x\n", sdio_ireg);
		spin_lock_irqsave(&adapter->int_lock, flags);
		adapter->int_status |= sdio_ireg;
		spin_unlock_irqrestore(&adapter->int_lock, flags);
	}
}

/*
 * SDIO interrupt handler.
 *
 * This function reads the interrupt status from firmware and assigns
 * the main process in workqueue which will handle the interrupt.
 */
static void
mwifiex_sdio_interrupt(struct sdio_func *func)
{
	struct mwifiex_adapter *adapter;
	struct sdio_mmc_card *card;

	card = sdio_get_drvdata(func);
	if (!card || !card->adapter) {
		pr_debug("int: func=%p card=%p adapter=%p\n",
		       func, card, card ? card->adapter : NULL);
		return;
	}
	adapter = card->adapter;

	if (adapter->surprise_removed)
		return;

	if (!adapter->pps_uapsd_mode && adapter->ps_state == PS_STATE_SLEEP)
		adapter->ps_state = PS_STATE_AWAKE;

	mwifiex_interrupt_status(adapter);
	queue_work(adapter->workqueue, &adapter->main_work);
}

/*
 * This function decodes a received packet.
 *
 * Based on the type, the packet is treated as either a data, or
 * a command response, or an event, and the correct handler
 * function is invoked.
 */
static int mwifiex_decode_rx_packet(struct mwifiex_adapter *adapter,
				    struct sk_buff *skb, u32 upld_typ)
{
	u8 *cmd_buf;

	skb_pull(skb, INTF_HEADER_LEN);

	switch (upld_typ) {
	case MWIFIEX_TYPE_DATA:
		dev_dbg(adapter->dev, "info: --- Rx: Data packet ---\n");
		mwifiex_handle_rx_packet(adapter, skb);
		break;

	case MWIFIEX_TYPE_CMD:
		dev_dbg(adapter->dev, "info: --- Rx: Cmd Response ---\n");
		/* take care of curr_cmd = NULL case */
		if (!adapter->curr_cmd) {
			cmd_buf = adapter->upld_buf;

			if (adapter->ps_state == PS_STATE_SLEEP_CFM)
				mwifiex_process_sleep_confirm_resp(adapter,
							skb->data, skb->len);

			memcpy(cmd_buf, skb->data, min_t(u32,
				       MWIFIEX_SIZE_OF_CMD_BUFFER, skb->len));

			dev_kfree_skb_any(skb);
		} else {
			adapter->cmd_resp_received = true;
			adapter->curr_cmd->resp_skb = skb;
		}
		break;

	case MWIFIEX_TYPE_EVENT:
		dev_dbg(adapter->dev, "info: --- Rx: Event ---\n");
		adapter->event_cause = *(u32 *) skb->data;

		skb_pull(skb, MWIFIEX_EVENT_HEADER_LEN);

		if ((skb->len > 0) && (skb->len  < MAX_EVENT_SIZE))
			memcpy(adapter->event_body, skb->data, skb->len);

		/* event cause has been saved to adapter->event_cause */
		adapter->event_received = true;
		adapter->event_skb = skb;

		break;

	default:
		dev_err(adapter->dev, "unknown upload type %#x\n", upld_typ);
		dev_kfree_skb_any(skb);
		break;
	}

	return 0;
}

/*
 * This function transfers received packets from card to driver, performing
 * aggregation if required.
 *
 * For data received on control port, or if aggregation is disabled, the
 * received buffers are uploaded as separate packets. However, if aggregation
 * is enabled and required, the buffers are copied onto an aggregation buffer,
 * provided there is space left, processed and finally uploaded.
 */
static int mwifiex_sdio_card_to_host_mp_aggr(struct mwifiex_adapter *adapter,
					     struct sk_buff *skb, u8 port)
{
	struct sdio_mmc_card *card = adapter->card;
	s32 f_do_rx_aggr = 0;
	s32 f_do_rx_cur = 0;
	s32 f_aggr_cur = 0;
	struct sk_buff *skb_deaggr;
	u32 pind = 0;
	u32 pkt_len, pkt_type = 0;
	u8 *curr_ptr;
	u32 rx_len = skb->len;

	if (port == CTRL_PORT) {
		/* Read the command Resp without aggr */
		dev_dbg(adapter->dev, "info: %s: no aggregation for cmd "
				"response\n", __func__);

		f_do_rx_cur = 1;
		goto rx_curr_single;
	}

	if (!card->mpa_rx.enabled) {
		dev_dbg(adapter->dev, "info: %s: rx aggregation disabled\n",
						__func__);

		f_do_rx_cur = 1;
		goto rx_curr_single;
	}

	if (card->mp_rd_bitmap & (~((u16) CTRL_PORT_MASK))) {
		/* Some more data RX pending */
		dev_dbg(adapter->dev, "info: %s: not last packet\n", __func__);

		if (MP_RX_AGGR_IN_PROGRESS(card)) {
			if (MP_RX_AGGR_BUF_HAS_ROOM(card, skb->len)) {
				f_aggr_cur = 1;
			} else {
				/* No room in Aggr buf, do rx aggr now */
				f_do_rx_aggr = 1;
				f_do_rx_cur = 1;
			}
		} else {
			/* Rx aggr not in progress */
			f_aggr_cur = 1;
		}

	} else {
		/* No more data RX pending */
		dev_dbg(adapter->dev, "info: %s: last packet\n", __func__);

		if (MP_RX_AGGR_IN_PROGRESS(card)) {
			f_do_rx_aggr = 1;
			if (MP_RX_AGGR_BUF_HAS_ROOM(card, skb->len))
				f_aggr_cur = 1;
			else
				/* No room in Aggr buf, do rx aggr now */
				f_do_rx_cur = 1;
		} else {
			f_do_rx_cur = 1;
		}
	}

	if (f_aggr_cur) {
		dev_dbg(adapter->dev, "info: current packet aggregation\n");
		/* Curr pkt can be aggregated */
		MP_RX_AGGR_SETUP(card, skb, port);

		if (MP_RX_AGGR_PKT_LIMIT_REACHED(card) ||
		    MP_RX_AGGR_PORT_LIMIT_REACHED(card)) {
			dev_dbg(adapter->dev, "info: %s: aggregated packet "
					"limit reached\n", __func__);
			/* No more pkts allowed in Aggr buf, rx it */
			f_do_rx_aggr = 1;
		}
	}

	if (f_do_rx_aggr) {
		/* do aggr RX now */
		dev_dbg(adapter->dev, "info: do_rx_aggr: num of packets: %d\n",
		       card->mpa_rx.pkt_cnt);

		if (mwifiex_read_data_sync(adapter, card->mpa_rx.buf,
					   card->mpa_rx.buf_len,
					   (adapter->ioport | 0x1000 |
					    (card->mpa_rx.ports << 4)) +
					   card->mpa_rx.start_port, 1))
			return -1;

		curr_ptr = card->mpa_rx.buf;

		for (pind = 0; pind < card->mpa_rx.pkt_cnt; pind++) {

			/* get curr PKT len & type */
			pkt_len = *(u16 *) &curr_ptr[0];
			pkt_type = *(u16 *) &curr_ptr[2];

			/* copy pkt to deaggr buf */
			skb_deaggr = card->mpa_rx.skb_arr[pind];

			if ((pkt_type == MWIFIEX_TYPE_DATA) && (pkt_len <=
					 card->mpa_rx.len_arr[pind])) {

				memcpy(skb_deaggr->data, curr_ptr, pkt_len);

				skb_trim(skb_deaggr, pkt_len);

				/* Process de-aggr packet */
				mwifiex_decode_rx_packet(adapter, skb_deaggr,
							 pkt_type);
			} else {
				dev_err(adapter->dev, "wrong aggr pkt:"
					" type=%d len=%d max_len=%d\n",
					pkt_type, pkt_len,
					card->mpa_rx.len_arr[pind]);
				dev_kfree_skb_any(skb_deaggr);
			}
			curr_ptr += card->mpa_rx.len_arr[pind];
		}
		MP_RX_AGGR_BUF_RESET(card);
	}

rx_curr_single:
	if (f_do_rx_cur) {
		dev_dbg(adapter->dev, "info: RX: port: %d, rx_len: %d\n",
			port, rx_len);

		if (mwifiex_sdio_card_to_host(adapter, &pkt_type,
					      skb->data, skb->len,
					      adapter->ioport + port))
			return -1;

		mwifiex_decode_rx_packet(adapter, skb, pkt_type);
	}

	return 0;
}

/*
 * This function checks the current interrupt status.
 *
 * The following interrupts are checked and handled by this function -
 *      - Data sent
 *      - Command sent
 *      - Packets received
 *
 * Since the firmware does not generate download ready interrupt if the
 * port updated is command port only, command sent interrupt checking
 * should be done manually, and for every SDIO interrupt.
 *
 * In case of Rx packets received, the packets are uploaded from card to
 * host and processed accordingly.
 */
static int mwifiex_process_int_status(struct mwifiex_adapter *adapter)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret = 0;
	u8 sdio_ireg;
	struct sk_buff *skb = NULL;
	u8 port = CTRL_PORT;
	u32 len_reg_l, len_reg_u;
	u32 rx_blocks;
	u16 rx_len;
	unsigned long flags;

	spin_lock_irqsave(&adapter->int_lock, flags);
	sdio_ireg = adapter->int_status;
	adapter->int_status = 0;
	spin_unlock_irqrestore(&adapter->int_lock, flags);

	if (!sdio_ireg)
		return ret;

	if (sdio_ireg & DN_LD_HOST_INT_STATUS) {
		card->mp_wr_bitmap = ((u16) card->mp_regs[WR_BITMAP_U]) << 8;
		card->mp_wr_bitmap |= (u16) card->mp_regs[WR_BITMAP_L];
		dev_dbg(adapter->dev, "int: DNLD: wr_bitmap=0x%04x\n",
				card->mp_wr_bitmap);
		if (adapter->data_sent &&
		    (card->mp_wr_bitmap & card->mp_data_port_mask)) {
			dev_dbg(adapter->dev,
				"info:  <--- Tx DONE Interrupt --->\n");
			adapter->data_sent = false;
		}
	}

	/* As firmware will not generate download ready interrupt if the port
	   updated is command port only, cmd_sent should be done for any SDIO
	   interrupt. */
	if (adapter->cmd_sent) {
		/* Check if firmware has attach buffer at command port and
		   update just that in wr_bit_map. */
		card->mp_wr_bitmap |=
			(u16) card->mp_regs[WR_BITMAP_L] & CTRL_PORT_MASK;
		if (card->mp_wr_bitmap & CTRL_PORT_MASK)
			adapter->cmd_sent = false;
	}

	dev_dbg(adapter->dev, "info: cmd_sent=%d data_sent=%d\n",
	       adapter->cmd_sent, adapter->data_sent);
	if (sdio_ireg & UP_LD_HOST_INT_STATUS) {
		card->mp_rd_bitmap = ((u16) card->mp_regs[RD_BITMAP_U]) << 8;
		card->mp_rd_bitmap |= (u16) card->mp_regs[RD_BITMAP_L];
		dev_dbg(adapter->dev, "int: UPLD: rd_bitmap=0x%04x\n",
				card->mp_rd_bitmap);

		while (true) {
			ret = mwifiex_get_rd_port(adapter, &port);
			if (ret) {
				dev_dbg(adapter->dev,
					"info: no more rd_port available\n");
				break;
			}
			len_reg_l = RD_LEN_P0_L + (port << 1);
			len_reg_u = RD_LEN_P0_U + (port << 1);
			rx_len = ((u16) card->mp_regs[len_reg_u]) << 8;
			rx_len |= (u16) card->mp_regs[len_reg_l];
			dev_dbg(adapter->dev, "info: RX: port=%d rx_len=%u\n",
					port, rx_len);
			rx_blocks =
				(rx_len + MWIFIEX_SDIO_BLOCK_SIZE -
				 1) / MWIFIEX_SDIO_BLOCK_SIZE;
			if (rx_len <= INTF_HEADER_LEN
			    || (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE) >
			    MWIFIEX_RX_DATA_BUF_SIZE) {
				dev_err(adapter->dev, "invalid rx_len=%d\n",
						rx_len);
				return -1;
			}
			rx_len = (u16) (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE);

			skb = dev_alloc_skb(rx_len);

			if (!skb) {
				dev_err(adapter->dev, "%s: failed to alloc skb",
								__func__);
				return -1;
			}

			skb_put(skb, rx_len);

			dev_dbg(adapter->dev, "info: rx_len = %d skb->len = %d\n",
					rx_len, skb->len);

			if (mwifiex_sdio_card_to_host_mp_aggr(adapter, skb,
							      port)) {
				u32 cr = 0;

				dev_err(adapter->dev, "card_to_host_mpa failed:"
						" int status=%#x\n", sdio_ireg);
				if (mwifiex_read_reg(adapter,
						     CONFIGURATION_REG, &cr))
					dev_err(adapter->dev,
							"read CFG reg failed\n");

				dev_dbg(adapter->dev,
						"info: CFG reg val = %d\n", cr);
				if (mwifiex_write_reg(adapter,
						      CONFIGURATION_REG,
						      (cr | 0x04)))
					dev_err(adapter->dev,
							"write CFG reg failed\n");

				dev_dbg(adapter->dev, "info: write success\n");
				if (mwifiex_read_reg(adapter,
						     CONFIGURATION_REG, &cr))
					dev_err(adapter->dev,
							"read CFG reg failed\n");

				dev_dbg(adapter->dev,
						"info: CFG reg val =%x\n", cr);
				dev_kfree_skb_any(skb);
				return -1;
			}
		}
	}

	return 0;
}

/*
 * This function aggregates transmission buffers in driver and downloads
 * the aggregated packet to card.
 *
 * The individual packets are aggregated by copying into an aggregation
 * buffer and then downloaded to the card. Previous unsent packets in the
 * aggregation buffer are pre-copied first before new packets are added.
 * Aggregation is done till there is space left in the aggregation buffer,
 * or till new packets are available.
 *
 * The function will only download the packet to the card when aggregation
 * stops, otherwise it will just aggregate the packet in aggregation buffer
 * and return.
 */
static int mwifiex_host_to_card_mp_aggr(struct mwifiex_adapter *adapter,
					u8 *payload, u32 pkt_len, u8 port,
					u32 next_pkt_len)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret = 0;
	s32 f_send_aggr_buf = 0;
	s32 f_send_cur_buf = 0;
	s32 f_precopy_cur_buf = 0;
	s32 f_postcopy_cur_buf = 0;

	if ((!card->mpa_tx.enabled) || (port == CTRL_PORT)) {
		dev_dbg(adapter->dev, "info: %s: tx aggregation disabled\n",
						__func__);

		f_send_cur_buf = 1;
		goto tx_curr_single;
	}

	if (next_pkt_len) {
		/* More pkt in TX queue */
		dev_dbg(adapter->dev, "info: %s: more packets in queue.\n",
						__func__);

		if (MP_TX_AGGR_IN_PROGRESS(card)) {
			if (!MP_TX_AGGR_PORT_LIMIT_REACHED(card) &&
			    MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len)) {
				f_precopy_cur_buf = 1;

				if (!(card->mp_wr_bitmap &
						(1 << card->curr_wr_port))
						|| !MP_TX_AGGR_BUF_HAS_ROOM(
							card, next_pkt_len))
					f_send_aggr_buf = 1;
			} else {
				/* No room in Aggr buf, send it */
				f_send_aggr_buf = 1;

				if (MP_TX_AGGR_PORT_LIMIT_REACHED(card) ||
				    !(card->mp_wr_bitmap &
				      (1 << card->curr_wr_port)))
					f_send_cur_buf = 1;
				else
					f_postcopy_cur_buf = 1;
			}
		} else {
			if (MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len)
			    && (card->mp_wr_bitmap & (1 << card->curr_wr_port)))
				f_precopy_cur_buf = 1;
			else
				f_send_cur_buf = 1;
		}
	} else {
		/* Last pkt in TX queue */
		dev_dbg(adapter->dev, "info: %s: Last packet in Tx Queue.\n",
						__func__);

		if (MP_TX_AGGR_IN_PROGRESS(card)) {
			/* some packs in Aggr buf already */
			f_send_aggr_buf = 1;

			if (MP_TX_AGGR_BUF_HAS_ROOM(card, pkt_len))
				f_precopy_cur_buf = 1;
			else
				/* No room in Aggr buf, send it */
				f_send_cur_buf = 1;
		} else {
			f_send_cur_buf = 1;
		}
	}

	if (f_precopy_cur_buf) {
		dev_dbg(adapter->dev, "data: %s: precopy current buffer\n",
						__func__);
		MP_TX_AGGR_BUF_PUT(card, payload, pkt_len, port);

		if (MP_TX_AGGR_PKT_LIMIT_REACHED(card) ||
		    MP_TX_AGGR_PORT_LIMIT_REACHED(card))
			/* No more pkts allowed in Aggr buf, send it */
			f_send_aggr_buf = 1;
	}

	if (f_send_aggr_buf) {
		dev_dbg(adapter->dev, "data: %s: send aggr buffer: %d %d\n",
				__func__,
				card->mpa_tx.start_port, card->mpa_tx.ports);
		ret = mwifiex_write_data_to_card(adapter, card->mpa_tx.buf,
						 card->mpa_tx.buf_len,
						 (adapter->ioport | 0x1000 |
						 (card->mpa_tx.ports << 4)) +
						  card->mpa_tx.start_port);

		MP_TX_AGGR_BUF_RESET(card);
	}

tx_curr_single:
	if (f_send_cur_buf) {
		dev_dbg(adapter->dev, "data: %s: send current buffer %d\n",
						__func__, port);
		ret = mwifiex_write_data_to_card(adapter, payload, pkt_len,
						 adapter->ioport + port);
	}

	if (f_postcopy_cur_buf) {
		dev_dbg(adapter->dev, "data: %s: postcopy current buffer\n",
						__func__);
		MP_TX_AGGR_BUF_PUT(card, payload, pkt_len, port);
	}

	return ret;
}

/*
 * This function downloads data from driver to card.
 *
 * Both commands and data packets are transferred to the card by this
 * function.
 *
 * This function adds the SDIO specific header to the front of the buffer
 * before transferring. The header contains the length of the packet and
 * the type. The firmware handles the packets based upon this set type.
 */
static int mwifiex_sdio_host_to_card(struct mwifiex_adapter *adapter,
				     u8 type, u8 *payload, u32 pkt_len,
				     struct mwifiex_tx_param *tx_param)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret = 0;
	u32 buf_block_len;
	u32 blk_size;
	u8 port = CTRL_PORT;

	/* Allocate buffer and copy payload */
	blk_size = MWIFIEX_SDIO_BLOCK_SIZE;
	buf_block_len = (pkt_len + blk_size - 1) / blk_size;
	*(u16 *) &payload[0] = (u16) pkt_len;
	*(u16 *) &payload[2] = type;

	/*
	 * This is SDIO specific header
	 *  u16 length,
	 *  u16 type (MWIFIEX_TYPE_DATA = 0, MWIFIEX_TYPE_CMD = 1,
	 *  MWIFIEX_TYPE_EVENT = 3)
	 */
	if (type == MWIFIEX_TYPE_DATA) {
		ret = mwifiex_get_wr_port_data(adapter, &port);
		if (ret) {
			dev_err(adapter->dev, "%s: no wr_port available\n",
						__func__);
			return ret;
		}
	} else {
		adapter->cmd_sent = true;
		/* Type must be MWIFIEX_TYPE_CMD */

		if (pkt_len <= INTF_HEADER_LEN ||
		    pkt_len > MWIFIEX_UPLD_SIZE)
			dev_err(adapter->dev, "%s: payload=%p, nb=%d\n",
					__func__, payload, pkt_len);
	}

	/* Transfer data to card */
	pkt_len = buf_block_len * blk_size;

	if (tx_param)
		ret = mwifiex_host_to_card_mp_aggr(adapter, payload, pkt_len,
				port, tx_param->next_pkt_len);
	else
		ret = mwifiex_host_to_card_mp_aggr(adapter, payload, pkt_len,
				port, 0);

	if (ret) {
		if (type == MWIFIEX_TYPE_CMD)
			adapter->cmd_sent = false;
		if (type == MWIFIEX_TYPE_DATA)
			adapter->data_sent = false;
	} else {
		if (type == MWIFIEX_TYPE_DATA) {
			if (!(card->mp_wr_bitmap & (1 << card->curr_wr_port)))
				adapter->data_sent = true;
			else
				adapter->data_sent = false;
		}
	}

	return ret;
}

/*
 * This function allocates the MPA Tx and Rx buffers.
 */
static int mwifiex_alloc_sdio_mpa_buffers(struct mwifiex_adapter *adapter,
				   u32 mpa_tx_buf_size, u32 mpa_rx_buf_size)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret = 0;

	card->mpa_tx.buf = kzalloc(mpa_tx_buf_size, GFP_KERNEL);
	if (!card->mpa_tx.buf) {
		dev_err(adapter->dev, "could not alloc buffer for MP-A TX\n");
		ret = -1;
		goto error;
	}

	card->mpa_tx.buf_size = mpa_tx_buf_size;

	card->mpa_rx.buf = kzalloc(mpa_rx_buf_size, GFP_KERNEL);
	if (!card->mpa_rx.buf) {
		dev_err(adapter->dev, "could not alloc buffer for MP-A RX\n");
		ret = -1;
		goto error;
	}

	card->mpa_rx.buf_size = mpa_rx_buf_size;

error:
	if (ret) {
		kfree(card->mpa_tx.buf);
		kfree(card->mpa_rx.buf);
	}

	return ret;
}

/*
 * This function unregisters the SDIO device.
 *
 * The SDIO IRQ is released, the function is disabled and driver
 * data is set to null.
 */
static void
mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
{
	struct sdio_mmc_card *card = adapter->card;

	if (adapter->card) {
		/* Release the SDIO IRQ */
		sdio_claim_host(card->func);
		sdio_release_irq(card->func);
		sdio_disable_func(card->func);
		sdio_release_host(card->func);
		sdio_set_drvdata(card->func, NULL);
	}
}

/*
 * This function registers the SDIO device.
 *
 * SDIO IRQ is claimed, block size is set and driver data is initialized.
 */
static int mwifiex_register_dev(struct mwifiex_adapter *adapter)
{
	int ret = 0;
	struct sdio_mmc_card *card = adapter->card;
	struct sdio_func *func = card->func;

	/* save adapter pointer in card */
	card->adapter = adapter;

	sdio_claim_host(func);

	/* Request the SDIO IRQ */
	ret = sdio_claim_irq(func, mwifiex_sdio_interrupt);
	if (ret) {
		pr_err("claim irq failed: ret=%d\n", ret);
		goto disable_func;
	}

	/* Set block size */
	ret = sdio_set_block_size(card->func, MWIFIEX_SDIO_BLOCK_SIZE);
	if (ret) {
		pr_err("cannot set SDIO block size\n");
		ret = -1;
		goto release_irq;
	}

	sdio_release_host(func);
	sdio_set_drvdata(func, card);

	adapter->dev = &func->dev;

	return 0;

release_irq:
	sdio_release_irq(func);
disable_func:
	sdio_disable_func(func);
	sdio_release_host(func);
	adapter->card = NULL;

	return -1;
}

/*
 * This function initializes the SDIO driver.
 *
 * The following initializations steps are followed -
 *      - Read the Host interrupt status register to acknowledge
 *        the first interrupt got from bootloader
 *      - Disable host interrupt mask register
 *      - Get SDIO port
 *      - Get revision ID
 *      - Initialize SDIO variables in card
 *      - Allocate MP registers
 *      - Allocate MPA Tx and Rx buffers
 */
static int mwifiex_init_sdio(struct mwifiex_adapter *adapter)
{
	struct sdio_mmc_card *card = adapter->card;
	int ret;
	u32 sdio_ireg = 0;

	/*
	 * Read the HOST_INT_STATUS_REG for ACK the first interrupt got
	 * from the bootloader. If we don't do this we get a interrupt
	 * as soon as we register the irq.
	 */
	mwifiex_read_reg(adapter, HOST_INTSTATUS_REG, &sdio_ireg);

	/* Disable host interrupt mask register for SDIO */
	mwifiex_sdio_disable_host_int(adapter);

	/* Get SDIO ioport */
	mwifiex_init_sdio_ioport(adapter);

	/* Get revision ID */
#define REV_ID_REG	0x5c
	mwifiex_read_reg(adapter, REV_ID_REG, &adapter->revision_id);

	/* Initialize SDIO variables in card */
	card->mp_rd_bitmap = 0;
	card->mp_wr_bitmap = 0;
	card->curr_rd_port = 1;
	card->curr_wr_port = 1;

	card->mp_data_port_mask = DATA_PORT_MASK;

	card->mpa_tx.buf_len = 0;
	card->mpa_tx.pkt_cnt = 0;
	card->mpa_tx.start_port = 0;

	card->mpa_tx.enabled = 0;
	card->mpa_tx.pkt_aggr_limit = SDIO_MP_AGGR_DEF_PKT_LIMIT;

	card->mpa_rx.buf_len = 0;
	card->mpa_rx.pkt_cnt = 0;
	card->mpa_rx.start_port = 0;

	card->mpa_rx.enabled = 0;
	card->mpa_rx.pkt_aggr_limit = SDIO_MP_AGGR_DEF_PKT_LIMIT;

	/* Allocate buffers for SDIO MP-A */
	card->mp_regs = kzalloc(MAX_MP_REGS, GFP_KERNEL);
	if (!card->mp_regs) {
		dev_err(adapter->dev, "failed to alloc mp_regs\n");
		return -1;
	}

	ret = mwifiex_alloc_sdio_mpa_buffers(adapter,
					     SDIO_MP_TX_AGGR_DEF_BUF_SIZE,
					     SDIO_MP_RX_AGGR_DEF_BUF_SIZE);
	if (ret) {
		dev_err(adapter->dev, "failed to alloc sdio mp-a buffers\n");
		kfree(card->mp_regs);
		return -1;
	}

	return ret;
}

/*
 * This function resets the MPA Tx and Rx buffers.
 */
static void mwifiex_cleanup_mpa_buf(struct mwifiex_adapter *adapter)
{
	struct sdio_mmc_card *card = adapter->card;

	MP_TX_AGGR_BUF_RESET(card);
	MP_RX_AGGR_BUF_RESET(card);
}

/*
 * This function cleans up the allocated card buffers.
 *
 * The following are freed by this function -
 *      - MP registers
 *      - MPA Tx buffer
 *      - MPA Rx buffer
 */
static void mwifiex_cleanup_sdio(struct mwifiex_adapter *adapter)
{
	struct sdio_mmc_card *card = adapter->card;

	kfree(card->mp_regs);
	kfree(card->mpa_tx.buf);
	kfree(card->mpa_rx.buf);
}

/*
 * This function updates the MP end port in card.
 */
static void
mwifiex_update_mp_end_port(struct mwifiex_adapter *adapter, u16 port)
{
	struct sdio_mmc_card *card = adapter->card;
	int i;

	card->mp_end_port = port;

	card->mp_data_port_mask = DATA_PORT_MASK;

	for (i = 1; i <= MAX_PORT - card->mp_end_port; i++)
		card->mp_data_port_mask &= ~(1 << (MAX_PORT - i));

	card->curr_wr_port = 1;

	dev_dbg(adapter->dev, "cmd: mp_end_port %d, data port mask 0x%x\n",
	       port, card->mp_data_port_mask);
}

static struct mwifiex_if_ops sdio_ops = {
	.init_if = mwifiex_init_sdio,
	.cleanup_if = mwifiex_cleanup_sdio,
	.check_fw_status = mwifiex_check_fw_status,
	.prog_fw = mwifiex_prog_fw_w_helper,
	.register_dev = mwifiex_register_dev,
	.unregister_dev = mwifiex_unregister_dev,
	.enable_int = mwifiex_sdio_enable_host_int,
	.process_int_status = mwifiex_process_int_status,
	.host_to_card = mwifiex_sdio_host_to_card,
	.wakeup = mwifiex_pm_wakeup_card,
	.wakeup_complete = mwifiex_pm_wakeup_card_complete,

	/* SDIO specific */
	.update_mp_end_port = mwifiex_update_mp_end_port,
	.cleanup_mpa_buf = mwifiex_cleanup_mpa_buf,
};

/*
 * This function initializes the SDIO driver.
 *
 * This initiates the semaphore and registers the device with
 * SDIO bus.
 */
static int
mwifiex_sdio_init_module(void)
{
	sema_init(&add_remove_card_sem, 1);

	return sdio_register_driver(&mwifiex_sdio);
}

/*
 * This function cleans up the SDIO driver.
 *
 * The following major steps are followed for cleanup -
 *      - Resume the device if its suspended
 *      - Disconnect the device if connected
 *      - Shutdown the firmware
 *      - Unregister the device from SDIO bus.
 */
static void
mwifiex_sdio_cleanup_module(void)
{
	struct mwifiex_adapter *adapter = g_adapter;
	int i;

	if (down_interruptible(&add_remove_card_sem))
		goto exit_sem_err;

	if (!adapter || !adapter->priv_num)
		goto exit;

	if (adapter->is_suspended)
		mwifiex_sdio_resume(adapter->dev);

	for (i = 0; i < adapter->priv_num; i++)
		if ((GET_BSS_ROLE(adapter->priv[i]) == MWIFIEX_BSS_ROLE_STA) &&
		    adapter->priv[i]->media_connected)
			mwifiex_deauthenticate(adapter->priv[i], NULL);

	if (!adapter->surprise_removed)
		mwifiex_init_shutdown_fw(mwifiex_get_priv(adapter,
							  MWIFIEX_BSS_ROLE_ANY),
					 MWIFIEX_FUNC_SHUTDOWN);

exit:
	up(&add_remove_card_sem);

exit_sem_err:
	sdio_unregister_driver(&mwifiex_sdio);
}

module_init(mwifiex_sdio_init_module);
module_exit(mwifiex_sdio_cleanup_module);

MODULE_AUTHOR("Marvell International Ltd.");
MODULE_DESCRIPTION("Marvell WiFi-Ex SDIO Driver version " SDIO_VERSION);
MODULE_VERSION(SDIO_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_FIRMWARE("sd8787.bin");