summaryrefslogtreecommitdiff
path: root/drivers/bluetooth/btmtksdio.c
blob: 4ae6631a7c2959cdcf8ed459d1733f6a015db5c3 (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
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 MediaTek Inc.

/*
 * Bluetooth support for MediaTek SDIO devices
 *
 * This file is written based on btsdio.c and btmtkuart.c.
 *
 * Author: Sean Wang <sean.wang@mediatek.com>
 *
 */

#include <asm/unaligned.h>
#include <linux/atomic.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <linux/skbuff.h>

#include <linux/mmc/host.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio_func.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "h4_recv.h"
#include "btmtk.h"

#define VERSION "0.1"

#define MTKBTSDIO_AUTOSUSPEND_DELAY	1000

static bool enable_autosuspend = true;

struct btmtksdio_data {
	const char *fwname;
	u16 chipid;
	bool lp_mbox_supported;
};

static const struct btmtksdio_data mt7663_data = {
	.fwname = FIRMWARE_MT7663,
	.chipid = 0x7663,
	.lp_mbox_supported = false,
};

static const struct btmtksdio_data mt7668_data = {
	.fwname = FIRMWARE_MT7668,
	.chipid = 0x7668,
	.lp_mbox_supported = false,
};

static const struct btmtksdio_data mt7921_data = {
	.fwname = FIRMWARE_MT7961,
	.chipid = 0x7921,
	.lp_mbox_supported = true,
};

static const struct sdio_device_id btmtksdio_table[] = {
	{SDIO_DEVICE(SDIO_VENDOR_ID_MEDIATEK, SDIO_DEVICE_ID_MEDIATEK_MT7663),
	 .driver_data = (kernel_ulong_t)&mt7663_data },
	{SDIO_DEVICE(SDIO_VENDOR_ID_MEDIATEK, SDIO_DEVICE_ID_MEDIATEK_MT7668),
	 .driver_data = (kernel_ulong_t)&mt7668_data },
	{SDIO_DEVICE(SDIO_VENDOR_ID_MEDIATEK, SDIO_DEVICE_ID_MEDIATEK_MT7961),
	 .driver_data = (kernel_ulong_t)&mt7921_data },
	{ }	/* Terminating entry */
};
MODULE_DEVICE_TABLE(sdio, btmtksdio_table);

#define MTK_REG_CHLPCR		0x4	/* W1S */
#define C_INT_EN_SET		BIT(0)
#define C_INT_EN_CLR		BIT(1)
#define C_FW_OWN_REQ_SET	BIT(8)  /* For write */
#define C_COM_DRV_OWN		BIT(8)  /* For read */
#define C_FW_OWN_REQ_CLR	BIT(9)

#define MTK_REG_CSDIOCSR	0x8
#define SDIO_RE_INIT_EN		BIT(0)
#define SDIO_INT_CTL		BIT(2)

#define MTK_REG_CHCR		0xc
#define C_INT_CLR_CTRL		BIT(1)
#define BT_RST_DONE		BIT(8)

/* CHISR have the same bits field definition with CHIER */
#define MTK_REG_CHISR		0x10
#define MTK_REG_CHIER		0x14
#define FW_OWN_BACK_INT		BIT(0)
#define RX_DONE_INT		BIT(1)
#define TX_EMPTY		BIT(2)
#define TX_FIFO_OVERFLOW	BIT(8)
#define FW_MAILBOX_INT		BIT(15)
#define INT_MASK		GENMASK(15, 0)
#define RX_PKT_LEN		GENMASK(31, 16)

#define MTK_REG_CSICR		0xc0
#define CSICR_CLR_MBOX_ACK BIT(0)
#define MTK_REG_PH2DSM0R	0xc4
#define PH2DSM0R_DRIVER_OWN	BIT(0)
#define MTK_REG_PD2HRM0R	0xdc
#define PD2HRM0R_DRV_OWN	BIT(0)

#define MTK_REG_CTDR		0x18

#define MTK_REG_CRDR		0x1c

#define MTK_REG_CRPLR		0x24

#define MTK_SDIO_BLOCK_SIZE	256

#define BTMTKSDIO_TX_WAIT_VND_EVT	1
#define BTMTKSDIO_HW_TX_READY		2
#define BTMTKSDIO_FUNC_ENABLED		3
#define BTMTKSDIO_PATCH_ENABLED		4
#define BTMTKSDIO_HW_RESET_ACTIVE	5

struct mtkbtsdio_hdr {
	__le16	len;
	__le16	reserved;
	u8	bt_type;
} __packed;

struct btmtksdio_dev {
	struct hci_dev *hdev;
	struct sdio_func *func;
	struct device *dev;

	struct work_struct txrx_work;
	unsigned long tx_state;
	struct sk_buff_head txq;

	struct sk_buff *evt_skb;

	const struct btmtksdio_data *data;

	struct gpio_desc *reset;
};

static int mtk_hci_wmt_sync(struct hci_dev *hdev,
			    struct btmtk_hci_wmt_params *wmt_params)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
	struct btmtk_hci_wmt_evt_reg *wmt_evt_reg;
	u32 hlen, status = BTMTK_WMT_INVALID;
	struct btmtk_hci_wmt_evt *wmt_evt;
	struct btmtk_hci_wmt_cmd *wc;
	struct btmtk_wmt_hdr *hdr;
	int err;

	/* Send the WMT command and wait until the WMT event returns */
	hlen = sizeof(*hdr) + wmt_params->dlen;
	if (hlen > 255)
		return -EINVAL;

	wc = kzalloc(hlen, GFP_KERNEL);
	if (!wc)
		return -ENOMEM;

	hdr = &wc->hdr;
	hdr->dir = 1;
	hdr->op = wmt_params->op;
	hdr->dlen = cpu_to_le16(wmt_params->dlen + 1);
	hdr->flag = wmt_params->flag;
	memcpy(wc->data, wmt_params->data, wmt_params->dlen);

	set_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state);

	err = __hci_cmd_send(hdev, 0xfc6f, hlen, wc);
	if (err < 0) {
		clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state);
		goto err_free_wc;
	}

	/* The vendor specific WMT commands are all answered by a vendor
	 * specific event and will not have the Command Status or Command
	 * Complete as with usual HCI command flow control.
	 *
	 * After sending the command, wait for BTMTKSDIO_TX_WAIT_VND_EVT
	 * state to be cleared. The driver specific event receive routine
	 * will clear that state and with that indicate completion of the
	 * WMT command.
	 */
	err = wait_on_bit_timeout(&bdev->tx_state, BTMTKSDIO_TX_WAIT_VND_EVT,
				  TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
	if (err == -EINTR) {
		bt_dev_err(hdev, "Execution of wmt command interrupted");
		clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state);
		goto err_free_wc;
	}

	if (err) {
		bt_dev_err(hdev, "Execution of wmt command timed out");
		clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state);
		err = -ETIMEDOUT;
		goto err_free_wc;
	}

	/* Parse and handle the return WMT event */
	wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data;
	if (wmt_evt->whdr.op != hdr->op) {
		bt_dev_err(hdev, "Wrong op received %d expected %d",
			   wmt_evt->whdr.op, hdr->op);
		err = -EIO;
		goto err_free_skb;
	}

	switch (wmt_evt->whdr.op) {
	case BTMTK_WMT_SEMAPHORE:
		if (wmt_evt->whdr.flag == 2)
			status = BTMTK_WMT_PATCH_UNDONE;
		else
			status = BTMTK_WMT_PATCH_DONE;
		break;
	case BTMTK_WMT_FUNC_CTRL:
		wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt;
		if (be16_to_cpu(wmt_evt_funcc->status) == 0x404)
			status = BTMTK_WMT_ON_DONE;
		else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420)
			status = BTMTK_WMT_ON_PROGRESS;
		else
			status = BTMTK_WMT_ON_UNDONE;
		break;
	case BTMTK_WMT_PATCH_DWNLD:
		if (wmt_evt->whdr.flag == 2)
			status = BTMTK_WMT_PATCH_DONE;
		else if (wmt_evt->whdr.flag == 1)
			status = BTMTK_WMT_PATCH_PROGRESS;
		else
			status = BTMTK_WMT_PATCH_UNDONE;
		break;
	case BTMTK_WMT_REGISTER:
		wmt_evt_reg = (struct btmtk_hci_wmt_evt_reg *)wmt_evt;
		if (le16_to_cpu(wmt_evt->whdr.dlen) == 12)
			status = le32_to_cpu(wmt_evt_reg->val);
		break;
	}

	if (wmt_params->status)
		*wmt_params->status = status;

err_free_skb:
	kfree_skb(bdev->evt_skb);
	bdev->evt_skb = NULL;
err_free_wc:
	kfree(wc);

	return err;
}

static int btmtksdio_tx_packet(struct btmtksdio_dev *bdev,
			       struct sk_buff *skb)
{
	struct mtkbtsdio_hdr *sdio_hdr;
	int err;

	/* Make sure that there are enough rooms for SDIO header */
	if (unlikely(skb_headroom(skb) < sizeof(*sdio_hdr))) {
		err = pskb_expand_head(skb, sizeof(*sdio_hdr), 0,
				       GFP_ATOMIC);
		if (err < 0)
			return err;
	}

	/* Prepend MediaTek SDIO Specific Header */
	skb_push(skb, sizeof(*sdio_hdr));

	sdio_hdr = (void *)skb->data;
	sdio_hdr->len = cpu_to_le16(skb->len);
	sdio_hdr->reserved = cpu_to_le16(0);
	sdio_hdr->bt_type = hci_skb_pkt_type(skb);

	clear_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state);
	err = sdio_writesb(bdev->func, MTK_REG_CTDR, skb->data,
			   round_up(skb->len, MTK_SDIO_BLOCK_SIZE));
	if (err < 0)
		goto err_skb_pull;

	bdev->hdev->stat.byte_tx += skb->len;

	kfree_skb(skb);

	return 0;

err_skb_pull:
	skb_pull(skb, sizeof(*sdio_hdr));

	return err;
}

static u32 btmtksdio_drv_own_query(struct btmtksdio_dev *bdev)
{
	return sdio_readl(bdev->func, MTK_REG_CHLPCR, NULL);
}

static u32 btmtksdio_drv_own_query_79xx(struct btmtksdio_dev *bdev)
{
	return sdio_readl(bdev->func, MTK_REG_PD2HRM0R, NULL);
}

static u32 btmtksdio_chcr_query(struct btmtksdio_dev *bdev)
{
	return sdio_readl(bdev->func, MTK_REG_CHCR, NULL);
}

static int btmtksdio_fw_pmctrl(struct btmtksdio_dev *bdev)
{
	u32 status;
	int err;

	sdio_claim_host(bdev->func);

	if (bdev->data->lp_mbox_supported &&
	    test_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state)) {
		sdio_writel(bdev->func, CSICR_CLR_MBOX_ACK, MTK_REG_CSICR,
			    &err);
		err = readx_poll_timeout(btmtksdio_drv_own_query_79xx, bdev,
					 status, !(status & PD2HRM0R_DRV_OWN),
					 2000, 1000000);
		if (err < 0) {
			bt_dev_err(bdev->hdev, "mailbox ACK not cleared");
			goto out;
		}
	}

	/* Return ownership to the device */
	sdio_writel(bdev->func, C_FW_OWN_REQ_SET, MTK_REG_CHLPCR, &err);
	if (err < 0)
		goto out;

	err = readx_poll_timeout(btmtksdio_drv_own_query, bdev, status,
				 !(status & C_COM_DRV_OWN), 2000, 1000000);

out:
	sdio_release_host(bdev->func);

	if (err < 0)
		bt_dev_err(bdev->hdev, "Cannot return ownership to device");

	return err;
}

static int btmtksdio_drv_pmctrl(struct btmtksdio_dev *bdev)
{
	u32 status;
	int err;

	sdio_claim_host(bdev->func);

	/* Get ownership from the device */
	sdio_writel(bdev->func, C_FW_OWN_REQ_CLR, MTK_REG_CHLPCR, &err);
	if (err < 0)
		goto out;

	err = readx_poll_timeout(btmtksdio_drv_own_query, bdev, status,
				 status & C_COM_DRV_OWN, 2000, 1000000);

	if (!err && bdev->data->lp_mbox_supported &&
	    test_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state))
		err = readx_poll_timeout(btmtksdio_drv_own_query_79xx, bdev,
					 status, status & PD2HRM0R_DRV_OWN,
					 2000, 1000000);

out:
	sdio_release_host(bdev->func);

	if (err < 0)
		bt_dev_err(bdev->hdev, "Cannot get ownership from device");

	return err;
}

static int btmtksdio_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	struct hci_event_hdr *hdr = (void *)skb->data;
	u8 evt = hdr->evt;
	int err;

	/* When someone waits for the WMT event, the skb is being cloned
	 * and being processed the events from there then.
	 */
	if (test_bit(BTMTKSDIO_TX_WAIT_VND_EVT, &bdev->tx_state)) {
		bdev->evt_skb = skb_clone(skb, GFP_KERNEL);
		if (!bdev->evt_skb) {
			err = -ENOMEM;
			goto err_out;
		}
	}

	err = hci_recv_frame(hdev, skb);
	if (err < 0)
		goto err_free_skb;

	if (evt == HCI_EV_WMT) {
		if (test_and_clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT,
				       &bdev->tx_state)) {
			/* Barrier to sync with other CPUs */
			smp_mb__after_atomic();
			wake_up_bit(&bdev->tx_state, BTMTKSDIO_TX_WAIT_VND_EVT);
		}
	}

	return 0;

err_free_skb:
	kfree_skb(bdev->evt_skb);
	bdev->evt_skb = NULL;

err_out:
	return err;
}

static int btmtksdio_recv_acl(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	u16 handle = le16_to_cpu(hci_acl_hdr(skb)->handle);

	switch (handle) {
	case 0xfc6f:
		/* Firmware dump from device: when the firmware hangs, the
		 * device can no longer suspend and thus disable auto-suspend.
		 */
		pm_runtime_forbid(bdev->dev);
		fallthrough;
	case 0x05ff:
	case 0x05fe:
		/* Firmware debug logging */
		return hci_recv_diag(hdev, skb);
	}

	return hci_recv_frame(hdev, skb);
}

static const struct h4_recv_pkt mtk_recv_pkts[] = {
	{ H4_RECV_ACL,      .recv = btmtksdio_recv_acl },
	{ H4_RECV_SCO,      .recv = hci_recv_frame },
	{ H4_RECV_EVENT,    .recv = btmtksdio_recv_event },
};

static int btmtksdio_rx_packet(struct btmtksdio_dev *bdev, u16 rx_size)
{
	const struct h4_recv_pkt *pkts = mtk_recv_pkts;
	int pkts_count = ARRAY_SIZE(mtk_recv_pkts);
	struct mtkbtsdio_hdr *sdio_hdr;
	int err, i, pad_size;
	struct sk_buff *skb;
	u16 dlen;

	if (rx_size < sizeof(*sdio_hdr))
		return -EILSEQ;

	/* A SDIO packet is exactly containing a Bluetooth packet */
	skb = bt_skb_alloc(rx_size, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	skb_put(skb, rx_size);

	err = sdio_readsb(bdev->func, skb->data, MTK_REG_CRDR, rx_size);
	if (err < 0)
		goto err_kfree_skb;

	sdio_hdr = (void *)skb->data;

	/* We assume the default error as -EILSEQ simply to make the error path
	 * be cleaner.
	 */
	err = -EILSEQ;

	if (rx_size != le16_to_cpu(sdio_hdr->len)) {
		bt_dev_err(bdev->hdev, "Rx size in sdio header is mismatched ");
		goto err_kfree_skb;
	}

	hci_skb_pkt_type(skb) = sdio_hdr->bt_type;

	/* Remove MediaTek SDIO header */
	skb_pull(skb, sizeof(*sdio_hdr));

	/* We have to dig into the packet to get payload size and then know how
	 * many padding bytes at the tail, these padding bytes should be removed
	 * before the packet is indicated to the core layer.
	 */
	for (i = 0; i < pkts_count; i++) {
		if (sdio_hdr->bt_type == (&pkts[i])->type)
			break;
	}

	if (i >= pkts_count) {
		bt_dev_err(bdev->hdev, "Invalid bt type 0x%02x",
			   sdio_hdr->bt_type);
		goto err_kfree_skb;
	}

	/* Remaining bytes cannot hold a header*/
	if (skb->len < (&pkts[i])->hlen) {
		bt_dev_err(bdev->hdev, "The size of bt header is mismatched");
		goto err_kfree_skb;
	}

	switch ((&pkts[i])->lsize) {
	case 1:
		dlen = skb->data[(&pkts[i])->loff];
		break;
	case 2:
		dlen = get_unaligned_le16(skb->data +
						  (&pkts[i])->loff);
		break;
	default:
		goto err_kfree_skb;
	}

	pad_size = skb->len - (&pkts[i])->hlen -  dlen;

	/* Remaining bytes cannot hold a payload */
	if (pad_size < 0) {
		bt_dev_err(bdev->hdev, "The size of bt payload is mismatched");
		goto err_kfree_skb;
	}

	/* Remove padding bytes */
	skb_trim(skb, skb->len - pad_size);

	/* Complete frame */
	(&pkts[i])->recv(bdev->hdev, skb);

	bdev->hdev->stat.byte_rx += rx_size;

	return 0;

err_kfree_skb:
	kfree_skb(skb);

	return err;
}

static void btmtksdio_txrx_work(struct work_struct *work)
{
	struct btmtksdio_dev *bdev = container_of(work, struct btmtksdio_dev,
						  txrx_work);
	unsigned long txrx_timeout;
	u32 int_status, rx_size;
	struct sk_buff *skb;
	int err;

	pm_runtime_get_sync(bdev->dev);

	sdio_claim_host(bdev->func);

	/* Disable interrupt */
	sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, 0);

	txrx_timeout = jiffies + 5 * HZ;

	do {
		int_status = sdio_readl(bdev->func, MTK_REG_CHISR, NULL);

		/* Ack an interrupt as soon as possible before any operation on
		 * hardware.
		 *
		 * Note that we don't ack any status during operations to avoid race
		 * condition between the host and the device such as it's possible to
		 * mistakenly ack RX_DONE for the next packet and then cause interrupts
		 * not be raised again but there is still pending data in the hardware
		 * FIFO.
		 */
		sdio_writel(bdev->func, int_status, MTK_REG_CHISR, NULL);
		int_status &= INT_MASK;

		if ((int_status & FW_MAILBOX_INT) &&
		    bdev->data->chipid == 0x7921) {
			sdio_writel(bdev->func, PH2DSM0R_DRIVER_OWN,
				    MTK_REG_PH2DSM0R, 0);
		}

		if (int_status & FW_OWN_BACK_INT)
			bt_dev_dbg(bdev->hdev, "Get fw own back");

		if (int_status & TX_EMPTY)
			set_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state);

		else if (unlikely(int_status & TX_FIFO_OVERFLOW))
			bt_dev_warn(bdev->hdev, "Tx fifo overflow");

		if (test_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state)) {
			skb = skb_dequeue(&bdev->txq);
			if (skb) {
				err = btmtksdio_tx_packet(bdev, skb);
				if (err < 0) {
					bdev->hdev->stat.err_tx++;
					skb_queue_head(&bdev->txq, skb);
				}
			}
		}

		if (int_status & RX_DONE_INT) {
			rx_size = sdio_readl(bdev->func, MTK_REG_CRPLR, NULL);
			rx_size = (rx_size & RX_PKT_LEN) >> 16;
			if (btmtksdio_rx_packet(bdev, rx_size) < 0)
				bdev->hdev->stat.err_rx++;
		}
	} while (int_status || time_is_before_jiffies(txrx_timeout));

	/* Enable interrupt */
	sdio_writel(bdev->func, C_INT_EN_SET, MTK_REG_CHLPCR, 0);

	sdio_release_host(bdev->func);

	pm_runtime_mark_last_busy(bdev->dev);
	pm_runtime_put_autosuspend(bdev->dev);
}

static void btmtksdio_interrupt(struct sdio_func *func)
{
	struct btmtksdio_dev *bdev = sdio_get_drvdata(func);

	/* Disable interrupt */
	sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, 0);

	schedule_work(&bdev->txrx_work);
}

static int btmtksdio_open(struct hci_dev *hdev)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	u32 val;
	int err;

	sdio_claim_host(bdev->func);

	err = sdio_enable_func(bdev->func);
	if (err < 0)
		goto err_release_host;

	set_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state);

	err = btmtksdio_drv_pmctrl(bdev);
	if (err < 0)
		goto err_disable_func;

	/* Disable interrupt & mask out all interrupt sources */
	sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, &err);
	if (err < 0)
		goto err_disable_func;

	sdio_writel(bdev->func, 0, MTK_REG_CHIER, &err);
	if (err < 0)
		goto err_disable_func;

	err = sdio_claim_irq(bdev->func, btmtksdio_interrupt);
	if (err < 0)
		goto err_disable_func;

	err = sdio_set_block_size(bdev->func, MTK_SDIO_BLOCK_SIZE);
	if (err < 0)
		goto err_release_irq;

	/* SDIO CMD 5 allows the SDIO device back to idle state an
	 * synchronous interrupt is supported in SDIO 4-bit mode
	 */
	val = sdio_readl(bdev->func, MTK_REG_CSDIOCSR, &err);
	if (err < 0)
		goto err_release_irq;

	val |= SDIO_INT_CTL;
	sdio_writel(bdev->func, val, MTK_REG_CSDIOCSR, &err);
	if (err < 0)
		goto err_release_irq;

	/* Explitly set write-1-clear method */
	val = sdio_readl(bdev->func, MTK_REG_CHCR, &err);
	if (err < 0)
		goto err_release_irq;

	val |= C_INT_CLR_CTRL;
	sdio_writel(bdev->func, val, MTK_REG_CHCR, &err);
	if (err < 0)
		goto err_release_irq;

	/* Setup interrupt sources */
	sdio_writel(bdev->func, RX_DONE_INT | TX_EMPTY | TX_FIFO_OVERFLOW,
		    MTK_REG_CHIER, &err);
	if (err < 0)
		goto err_release_irq;

	/* Enable interrupt */
	sdio_writel(bdev->func, C_INT_EN_SET, MTK_REG_CHLPCR, &err);
	if (err < 0)
		goto err_release_irq;

	sdio_release_host(bdev->func);

	return 0;

err_release_irq:
	sdio_release_irq(bdev->func);

err_disable_func:
	sdio_disable_func(bdev->func);

err_release_host:
	sdio_release_host(bdev->func);

	return err;
}

static int btmtksdio_close(struct hci_dev *hdev)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);

	sdio_claim_host(bdev->func);

	/* Disable interrupt */
	sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, NULL);

	sdio_release_irq(bdev->func);

	cancel_work_sync(&bdev->txrx_work);

	btmtksdio_fw_pmctrl(bdev);

	clear_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state);
	sdio_disable_func(bdev->func);

	sdio_release_host(bdev->func);

	return 0;
}

static int btmtksdio_flush(struct hci_dev *hdev)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);

	skb_queue_purge(&bdev->txq);

	cancel_work_sync(&bdev->txrx_work);

	return 0;
}

static int btmtksdio_func_query(struct hci_dev *hdev)
{
	struct btmtk_hci_wmt_params wmt_params;
	int status, err;
	u8 param = 0;

	/* Query whether the function is enabled */
	wmt_params.op = BTMTK_WMT_FUNC_CTRL;
	wmt_params.flag = 4;
	wmt_params.dlen = sizeof(param);
	wmt_params.data = &param;
	wmt_params.status = &status;

	err = mtk_hci_wmt_sync(hdev, &wmt_params);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to query function status (%d)", err);
		return err;
	}

	return status;
}

static int mt76xx_setup(struct hci_dev *hdev, const char *fwname)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	struct btmtk_hci_wmt_params wmt_params;
	struct btmtk_tci_sleep tci_sleep;
	struct sk_buff *skb;
	int err, status;
	u8 param = 0x1;

	/* Query whether the firmware is already download */
	wmt_params.op = BTMTK_WMT_SEMAPHORE;
	wmt_params.flag = 1;
	wmt_params.dlen = 0;
	wmt_params.data = NULL;
	wmt_params.status = &status;

	err = mtk_hci_wmt_sync(hdev, &wmt_params);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to query firmware status (%d)", err);
		return err;
	}

	if (status == BTMTK_WMT_PATCH_DONE) {
		bt_dev_info(hdev, "Firmware already downloaded");
		goto ignore_setup_fw;
	}

	/* Setup a firmware which the device definitely requires */
	err = btmtk_setup_firmware(hdev, fwname, mtk_hci_wmt_sync);
	if (err < 0)
		return err;

ignore_setup_fw:
	/* Query whether the device is already enabled */
	err = readx_poll_timeout(btmtksdio_func_query, hdev, status,
				 status < 0 || status != BTMTK_WMT_ON_PROGRESS,
				 2000, 5000000);
	/* -ETIMEDOUT happens */
	if (err < 0)
		return err;

	/* The other errors happen in btusb_mtk_func_query */
	if (status < 0)
		return status;

	if (status == BTMTK_WMT_ON_DONE) {
		bt_dev_info(hdev, "function already on");
		goto ignore_func_on;
	}

	/* Enable Bluetooth protocol */
	wmt_params.op = BTMTK_WMT_FUNC_CTRL;
	wmt_params.flag = 0;
	wmt_params.dlen = sizeof(param);
	wmt_params.data = &param;
	wmt_params.status = NULL;

	err = mtk_hci_wmt_sync(hdev, &wmt_params);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
		return err;
	}

	set_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state);

ignore_func_on:
	/* Apply the low power environment setup */
	tci_sleep.mode = 0x5;
	tci_sleep.duration = cpu_to_le16(0x640);
	tci_sleep.host_duration = cpu_to_le16(0x640);
	tci_sleep.host_wakeup_pin = 0;
	tci_sleep.time_compensation = 0;

	skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep,
			     HCI_INIT_TIMEOUT);
	if (IS_ERR(skb)) {
		err = PTR_ERR(skb);
		bt_dev_err(hdev, "Failed to apply low power setting (%d)", err);
		return err;
	}
	kfree_skb(skb);

	return 0;
}

static int mt79xx_setup(struct hci_dev *hdev, const char *fwname)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	struct btmtk_hci_wmt_params wmt_params;
	u8 param = 0x1;
	int err;

	err = btmtk_setup_firmware_79xx(hdev, fwname, mtk_hci_wmt_sync);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to setup 79xx firmware (%d)", err);
		return err;
	}

	/* Enable Bluetooth protocol */
	wmt_params.op = BTMTK_WMT_FUNC_CTRL;
	wmt_params.flag = 0;
	wmt_params.dlen = sizeof(param);
	wmt_params.data = &param;
	wmt_params.status = NULL;

	err = mtk_hci_wmt_sync(hdev, &wmt_params);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
		return err;
	}

	hci_set_msft_opcode(hdev, 0xFD30);
	hci_set_aosp_capable(hdev);
	set_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state);

	return err;
}

static int btmtksdio_mtk_reg_read(struct hci_dev *hdev, u32 reg, u32 *val)
{
	struct btmtk_hci_wmt_params wmt_params;
	struct reg_read_cmd reg_read = {
		.type = 1,
		.num = 1,
	};
	u32 status;
	int err;

	reg_read.addr = cpu_to_le32(reg);
	wmt_params.op = BTMTK_WMT_REGISTER;
	wmt_params.flag = BTMTK_WMT_REG_READ;
	wmt_params.dlen = sizeof(reg_read);
	wmt_params.data = &reg_read;
	wmt_params.status = &status;

	err = mtk_hci_wmt_sync(hdev, &wmt_params);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to read reg (%d)", err);
		return err;
	}

	*val = status;

	return err;
}

static int btmtksdio_mtk_reg_write(struct hci_dev *hdev, u32 reg, u32 val, u32 mask)
{
	struct btmtk_hci_wmt_params wmt_params;
	const struct reg_write_cmd reg_write = {
		.type = 1,
		.num = 1,
		.addr = cpu_to_le32(reg),
		.data = cpu_to_le32(val),
		.mask = cpu_to_le32(mask),
	};
	int err, status;

	wmt_params.op = BTMTK_WMT_REGISTER;
	wmt_params.flag = BTMTK_WMT_REG_WRITE;
	wmt_params.dlen = sizeof(reg_write);
	wmt_params.data = &reg_write;
	wmt_params.status = &status;

	err = mtk_hci_wmt_sync(hdev, &wmt_params);
	if (err < 0)
		bt_dev_err(hdev, "Failed to write reg (%d)", err);

	return err;
}

static int btmtksdio_get_data_path_id(struct hci_dev *hdev, __u8 *data_path_id)
{
	/* uses 1 as data path id for all the usecases */
	*data_path_id = 1;
	return 0;
}

static int btmtksdio_get_codec_config_data(struct hci_dev *hdev,
					   __u8 link, struct bt_codec *codec,
					   __u8 *ven_len, __u8 **ven_data)
{
	int err = 0;

	if (!ven_data || !ven_len)
		return -EINVAL;

	*ven_len = 0;
	*ven_data = NULL;

	if (link != ESCO_LINK) {
		bt_dev_err(hdev, "Invalid link type(%u)", link);
		return -EINVAL;
	}

	*ven_data = kmalloc(sizeof(__u8), GFP_KERNEL);
	if (!*ven_data) {
		err = -ENOMEM;
		goto error;
	}

	/* supports only CVSD and mSBC offload codecs */
	switch (codec->id) {
	case 0x02:
		**ven_data = 0x00;
		break;
	case 0x05:
		**ven_data = 0x01;
		break;
	default:
		err = -EINVAL;
		bt_dev_err(hdev, "Invalid codec id(%u)", codec->id);
		goto error;
	}
	/* codec and its capabilities are pre-defined to ids
	 * preset id = 0x00 represents CVSD codec with sampling rate 8K
	 * preset id = 0x01 represents mSBC codec with sampling rate 16K
	 */
	*ven_len = sizeof(__u8);
	return err;

error:
	kfree(*ven_data);
	*ven_data = NULL;
	return err;
}

static int btmtksdio_sco_setting(struct hci_dev *hdev)
{
	const struct btmtk_sco sco_setting = {
		.clock_config = 0x49,
		.channel_format_config = 0x80,
	};
	struct sk_buff *skb;
	u32 val;
	int err;

	/* Enable SCO over I2S/PCM for MediaTek chipset */
	skb =  __hci_cmd_sync(hdev, 0xfc72, sizeof(sco_setting),
			      &sco_setting, HCI_CMD_TIMEOUT);
	if (IS_ERR(skb))
		return PTR_ERR(skb);

	kfree_skb(skb);

	err = btmtksdio_mtk_reg_read(hdev, MT7921_PINMUX_0, &val);
	if (err < 0)
		return err;

	val |= 0x11000000;
	err = btmtksdio_mtk_reg_write(hdev, MT7921_PINMUX_0, val, ~0);
	if (err < 0)
		return err;

	err = btmtksdio_mtk_reg_read(hdev, MT7921_PINMUX_1, &val);
	if (err < 0)
		return err;

	val |= 0x00000101;
	err =  btmtksdio_mtk_reg_write(hdev, MT7921_PINMUX_1, val, ~0);
	if (err < 0)
		return err;

	hdev->get_data_path_id = btmtksdio_get_data_path_id;
	hdev->get_codec_config_data = btmtksdio_get_codec_config_data;

	return err;
}

static int btmtksdio_reset_setting(struct hci_dev *hdev)
{
	int err;
	u32 val;

	err = btmtksdio_mtk_reg_read(hdev, MT7921_PINMUX_1, &val);
	if (err < 0)
		return err;

	val |= 0x20; /* set the pin (bit field 11:8) work as GPIO mode */
	err = btmtksdio_mtk_reg_write(hdev, MT7921_PINMUX_1, val, ~0);
	if (err < 0)
		return err;

	err = btmtksdio_mtk_reg_read(hdev, MT7921_BTSYS_RST, &val);
	if (err < 0)
		return err;

	val |= MT7921_BTSYS_RST_WITH_GPIO;
	return btmtksdio_mtk_reg_write(hdev, MT7921_BTSYS_RST, val, ~0);
}

static int btmtksdio_setup(struct hci_dev *hdev)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	ktime_t calltime, delta, rettime;
	unsigned long long duration;
	char fwname[64];
	int err, dev_id;
	u32 fw_version = 0, val;

	calltime = ktime_get();
	set_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state);

	switch (bdev->data->chipid) {
	case 0x7921:
		if (test_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state)) {
			err = btmtksdio_mtk_reg_read(hdev, MT7921_DLSTATUS,
						     &val);
			if (err < 0)
				return err;

			val &= ~BT_DL_STATE;
			err = btmtksdio_mtk_reg_write(hdev, MT7921_DLSTATUS,
						      val, ~0);
			if (err < 0)
				return err;

			btmtksdio_fw_pmctrl(bdev);
			msleep(20);
			btmtksdio_drv_pmctrl(bdev);

			clear_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state);
		}

		err = btmtksdio_mtk_reg_read(hdev, 0x70010200, &dev_id);
		if (err < 0) {
			bt_dev_err(hdev, "Failed to get device id (%d)", err);
			return err;
		}

		err = btmtksdio_mtk_reg_read(hdev, 0x80021004, &fw_version);
		if (err < 0) {
			bt_dev_err(hdev, "Failed to get fw version (%d)", err);
			return err;
		}

		snprintf(fwname, sizeof(fwname),
			 "mediatek/BT_RAM_CODE_MT%04x_1_%x_hdr.bin",
			 dev_id & 0xffff, (fw_version & 0xff) + 1);
		err = mt79xx_setup(hdev, fwname);
		if (err < 0)
			return err;

		err = btmtksdio_fw_pmctrl(bdev);
		if (err < 0)
			return err;

		err = btmtksdio_drv_pmctrl(bdev);
		if (err < 0)
			return err;

		/* Enable SCO over I2S/PCM */
		err = btmtksdio_sco_setting(hdev);
		if (err < 0) {
			bt_dev_err(hdev, "Failed to enable SCO setting (%d)", err);
			return err;
		}

		/* Enable WBS with mSBC codec */
		set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);

		/* Enable GPIO reset mechanism */
		if (bdev->reset) {
			err = btmtksdio_reset_setting(hdev);
			if (err < 0) {
				bt_dev_err(hdev, "Failed to enable Reset setting (%d)", err);
				devm_gpiod_put(bdev->dev, bdev->reset);
				bdev->reset = NULL;
			}
		}

		/* Valid LE States quirk for MediaTek 7921 */
		set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);

		break;
	case 0x7663:
	case 0x7668:
		err = mt76xx_setup(hdev, bdev->data->fwname);
		if (err < 0)
			return err;
		break;
	default:
		return -ENODEV;
	}

	rettime = ktime_get();
	delta = ktime_sub(rettime, calltime);
	duration = (unsigned long long)ktime_to_ns(delta) >> 10;

	pm_runtime_set_autosuspend_delay(bdev->dev,
					 MTKBTSDIO_AUTOSUSPEND_DELAY);
	pm_runtime_use_autosuspend(bdev->dev);

	err = pm_runtime_set_active(bdev->dev);
	if (err < 0)
		return err;

	/* Default forbid runtime auto suspend, that can be allowed by
	 * enable_autosuspend flag or the PM runtime entry under sysfs.
	 */
	pm_runtime_forbid(bdev->dev);
	pm_runtime_enable(bdev->dev);

	if (enable_autosuspend)
		pm_runtime_allow(bdev->dev);

	bt_dev_info(hdev, "Device setup in %llu usecs", duration);

	return 0;
}

static int btmtksdio_shutdown(struct hci_dev *hdev)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	struct btmtk_hci_wmt_params wmt_params;
	u8 param = 0x0;
	int err;

	/* Get back the state to be consistent with the state
	 * in btmtksdio_setup.
	 */
	pm_runtime_get_sync(bdev->dev);

	/* Disable the device */
	wmt_params.op = BTMTK_WMT_FUNC_CTRL;
	wmt_params.flag = 0;
	wmt_params.dlen = sizeof(param);
	wmt_params.data = &param;
	wmt_params.status = NULL;

	err = mtk_hci_wmt_sync(hdev, &wmt_params);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
		return err;
	}

	pm_runtime_put_noidle(bdev->dev);
	pm_runtime_disable(bdev->dev);

	return 0;
}

static int btmtksdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);

	switch (hci_skb_pkt_type(skb)) {
	case HCI_COMMAND_PKT:
		hdev->stat.cmd_tx++;
		break;

	case HCI_ACLDATA_PKT:
		hdev->stat.acl_tx++;
		break;

	case HCI_SCODATA_PKT:
		hdev->stat.sco_tx++;
		break;

	default:
		return -EILSEQ;
	}

	skb_queue_tail(&bdev->txq, skb);

	schedule_work(&bdev->txrx_work);

	return 0;
}

static void btmtksdio_cmd_timeout(struct hci_dev *hdev)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	u32 status;
	int err;

	if (!bdev->reset || bdev->data->chipid != 0x7921)
		return;

	pm_runtime_get_sync(bdev->dev);

	if (test_and_set_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state))
		return;

	sdio_claim_host(bdev->func);

	sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, NULL);
	skb_queue_purge(&bdev->txq);
	cancel_work_sync(&bdev->txrx_work);

	gpiod_set_value_cansleep(bdev->reset, 1);
	msleep(100);
	gpiod_set_value_cansleep(bdev->reset, 0);

	err = readx_poll_timeout(btmtksdio_chcr_query, bdev, status,
				 status & BT_RST_DONE, 100000, 2000000);
	if (err < 0) {
		bt_dev_err(hdev, "Failed to reset (%d)", err);
		goto err;
	}

	clear_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state);
err:
	sdio_release_host(bdev->func);

	pm_runtime_put_noidle(bdev->dev);
	pm_runtime_disable(bdev->dev);

	hci_reset_dev(hdev);
}

static bool btmtksdio_sdio_wakeup(struct hci_dev *hdev)
{
	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
	bool may_wakeup = device_may_wakeup(bdev->dev);
	const struct btmtk_wakeon bt_awake = {
		.mode = 0x1,
		.gpo = 0,
		.active_high = 0x1,
		.enable_delay = cpu_to_le16(0xc80),
		.wakeup_delay = cpu_to_le16(0x20),
	};

	if (may_wakeup && bdev->data->chipid == 0x7921) {
		struct sk_buff *skb;

		skb =  __hci_cmd_sync(hdev, 0xfc27, sizeof(bt_awake),
				      &bt_awake, HCI_CMD_TIMEOUT);
		if (IS_ERR(skb))
			may_wakeup = false;
		else
			kfree_skb(skb);
	}

	return may_wakeup;
}

static int btmtksdio_probe(struct sdio_func *func,
			   const struct sdio_device_id *id)
{
	struct btmtksdio_dev *bdev;
	struct hci_dev *hdev;
	int err;

	bdev = devm_kzalloc(&func->dev, sizeof(*bdev), GFP_KERNEL);
	if (!bdev)
		return -ENOMEM;

	bdev->data = (void *)id->driver_data;
	if (!bdev->data)
		return -ENODEV;

	bdev->dev = &func->dev;
	bdev->func = func;

	INIT_WORK(&bdev->txrx_work, btmtksdio_txrx_work);
	skb_queue_head_init(&bdev->txq);

	/* Initialize and register HCI device */
	hdev = hci_alloc_dev();
	if (!hdev) {
		dev_err(&func->dev, "Can't allocate HCI device\n");
		return -ENOMEM;
	}

	bdev->hdev = hdev;

	hdev->bus = HCI_SDIO;
	hci_set_drvdata(hdev, bdev);

	hdev->open     = btmtksdio_open;
	hdev->close    = btmtksdio_close;
	hdev->cmd_timeout = btmtksdio_cmd_timeout;
	hdev->flush    = btmtksdio_flush;
	hdev->setup    = btmtksdio_setup;
	hdev->shutdown = btmtksdio_shutdown;
	hdev->send     = btmtksdio_send_frame;
	hdev->wakeup   = btmtksdio_sdio_wakeup;
	hdev->set_bdaddr = btmtk_set_bdaddr;

	SET_HCIDEV_DEV(hdev, &func->dev);

	hdev->manufacturer = 70;
	set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);

	sdio_set_drvdata(func, bdev);

	err = hci_register_dev(hdev);
	if (err < 0) {
		dev_err(&func->dev, "Can't register HCI device\n");
		hci_free_dev(hdev);
		return err;
	}

	/* pm_runtime_enable would be done after the firmware is being
	 * downloaded because the core layer probably already enables
	 * runtime PM for this func such as the case host->caps &
	 * MMC_CAP_POWER_OFF_CARD.
	 */
	if (pm_runtime_enabled(bdev->dev))
		pm_runtime_disable(bdev->dev);

	/* As explaination in drivers/mmc/core/sdio_bus.c tells us:
	 * Unbound SDIO functions are always suspended.
	 * During probe, the function is set active and the usage count
	 * is incremented.  If the driver supports runtime PM,
	 * it should call pm_runtime_put_noidle() in its probe routine and
	 * pm_runtime_get_noresume() in its remove routine.
	 *
	 * So, put a pm_runtime_put_noidle here !
	 */
	pm_runtime_put_noidle(bdev->dev);

	err = device_init_wakeup(bdev->dev, true);
	if (err)
		bt_dev_err(hdev, "failed to initialize device wakeup");

	bdev->dev->of_node = of_find_compatible_node(NULL, NULL,
						     "mediatek,mt7921s-bluetooth");
	bdev->reset = devm_gpiod_get_optional(bdev->dev, "reset",
					      GPIOD_OUT_LOW);
	if (IS_ERR(bdev->reset))
		err = PTR_ERR(bdev->reset);

	return err;
}

static void btmtksdio_remove(struct sdio_func *func)
{
	struct btmtksdio_dev *bdev = sdio_get_drvdata(func);
	struct hci_dev *hdev;

	if (!bdev)
		return;

	/* Be consistent the state in btmtksdio_probe */
	pm_runtime_get_noresume(bdev->dev);

	hdev = bdev->hdev;

	sdio_set_drvdata(func, NULL);
	hci_unregister_dev(hdev);
	hci_free_dev(hdev);
}

#ifdef CONFIG_PM
static int btmtksdio_runtime_suspend(struct device *dev)
{
	struct sdio_func *func = dev_to_sdio_func(dev);
	struct btmtksdio_dev *bdev;
	int err;

	bdev = sdio_get_drvdata(func);
	if (!bdev)
		return 0;

	if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state))
		return 0;

	sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);

	err = btmtksdio_fw_pmctrl(bdev);

	bt_dev_dbg(bdev->hdev, "status (%d) return ownership to device", err);

	return err;
}

static int btmtksdio_runtime_resume(struct device *dev)
{
	struct sdio_func *func = dev_to_sdio_func(dev);
	struct btmtksdio_dev *bdev;
	int err;

	bdev = sdio_get_drvdata(func);
	if (!bdev)
		return 0;

	if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state))
		return 0;

	err = btmtksdio_drv_pmctrl(bdev);

	bt_dev_dbg(bdev->hdev, "status (%d) get ownership from device", err);

	return err;
}

static UNIVERSAL_DEV_PM_OPS(btmtksdio_pm_ops, btmtksdio_runtime_suspend,
			    btmtksdio_runtime_resume, NULL);
#define BTMTKSDIO_PM_OPS (&btmtksdio_pm_ops)
#else	/* CONFIG_PM */
#define BTMTKSDIO_PM_OPS NULL
#endif	/* CONFIG_PM */

static struct sdio_driver btmtksdio_driver = {
	.name		= "btmtksdio",
	.probe		= btmtksdio_probe,
	.remove		= btmtksdio_remove,
	.id_table	= btmtksdio_table,
	.drv = {
		.owner = THIS_MODULE,
		.pm = BTMTKSDIO_PM_OPS,
	}
};

module_sdio_driver(btmtksdio_driver);

module_param(enable_autosuspend, bool, 0644);
MODULE_PARM_DESC(enable_autosuspend, "Enable autosuspend by default");

MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
MODULE_DESCRIPTION("MediaTek Bluetooth SDIO driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");