summaryrefslogtreecommitdiff
path: root/drivers/bluetooth/hci_qca.c
blob: 45adc1560d949af8aff2ed7cdc717cd9c5c228d5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Bluetooth Software UART Qualcomm protocol
 *
 *  HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management
 *  protocol extension to H4.
 *
 *  Copyright (C) 2007 Texas Instruments, Inc.
 *  Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved.
 *
 *  Acknowledgements:
 *  This file is based on hci_ll.c, which was...
 *  Written by Ohad Ben-Cohen <ohad@bencohen.org>
 *  which was in turn based on hci_h4.c, which was written
 *  by Maxim Krasnyansky and Marcel Holtmann.
 */

#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/devcoredump.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/pwrseq/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/serdev.h>
#include <linux/mutex.h>
#include <asm/unaligned.h>

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

#include "hci_uart.h"
#include "btqca.h"

/* HCI_IBS protocol messages */
#define HCI_IBS_SLEEP_IND	0xFE
#define HCI_IBS_WAKE_IND	0xFD
#define HCI_IBS_WAKE_ACK	0xFC
#define HCI_MAX_IBS_SIZE	10

#define IBS_WAKE_RETRANS_TIMEOUT_MS	100
#define IBS_BTSOC_TX_IDLE_TIMEOUT_MS	200
#define IBS_HOST_TX_IDLE_TIMEOUT_MS	2000
#define CMD_TRANS_TIMEOUT_MS		100
#define MEMDUMP_TIMEOUT_MS		8000
#define IBS_DISABLE_SSR_TIMEOUT_MS \
	(MEMDUMP_TIMEOUT_MS + FW_DOWNLOAD_TIMEOUT_MS)
#define FW_DOWNLOAD_TIMEOUT_MS		3000

/* susclk rate */
#define SUSCLK_RATE_32KHZ	32768

/* Controller debug log header */
#define QCA_DEBUG_HANDLE	0x2EDC

/* max retry count when init fails */
#define MAX_INIT_RETRIES 3

/* Controller dump header */
#define QCA_SSR_DUMP_HANDLE		0x0108
#define QCA_DUMP_PACKET_SIZE		255
#define QCA_LAST_SEQUENCE_NUM		0xFFFF
#define QCA_CRASHBYTE_PACKET_LEN	1096
#define QCA_MEMDUMP_BYTE		0xFB

enum qca_flags {
	QCA_IBS_DISABLED,
	QCA_DROP_VENDOR_EVENT,
	QCA_SUSPENDING,
	QCA_MEMDUMP_COLLECTION,
	QCA_HW_ERROR_EVENT,
	QCA_SSR_TRIGGERED,
	QCA_BT_OFF,
	QCA_ROM_FW,
	QCA_DEBUGFS_CREATED,
};

enum qca_capabilities {
	QCA_CAP_WIDEBAND_SPEECH = BIT(0),
	QCA_CAP_VALID_LE_STATES = BIT(1),
};

/* HCI_IBS transmit side sleep protocol states */
enum tx_ibs_states {
	HCI_IBS_TX_ASLEEP,
	HCI_IBS_TX_WAKING,
	HCI_IBS_TX_AWAKE,
};

/* HCI_IBS receive side sleep protocol states */
enum rx_states {
	HCI_IBS_RX_ASLEEP,
	HCI_IBS_RX_AWAKE,
};

/* HCI_IBS transmit and receive side clock state vote */
enum hci_ibs_clock_state_vote {
	HCI_IBS_VOTE_STATS_UPDATE,
	HCI_IBS_TX_VOTE_CLOCK_ON,
	HCI_IBS_TX_VOTE_CLOCK_OFF,
	HCI_IBS_RX_VOTE_CLOCK_ON,
	HCI_IBS_RX_VOTE_CLOCK_OFF,
};

/* Controller memory dump states */
enum qca_memdump_states {
	QCA_MEMDUMP_IDLE,
	QCA_MEMDUMP_COLLECTING,
	QCA_MEMDUMP_COLLECTED,
	QCA_MEMDUMP_TIMEOUT,
};

struct qca_memdump_info {
	u32 current_seq_no;
	u32 received_dump;
	u32 ram_dump_size;
};

struct qca_memdump_event_hdr {
	__u8    evt;
	__u8    plen;
	__u16   opcode;
	__le16   seq_no;
	__u8    reserved;
} __packed;


struct qca_dump_size {
	__le32 dump_size;
} __packed;

struct qca_data {
	struct hci_uart *hu;
	struct sk_buff *rx_skb;
	struct sk_buff_head txq;
	struct sk_buff_head tx_wait_q;	/* HCI_IBS wait queue	*/
	struct sk_buff_head rx_memdump_q;	/* Memdump wait queue	*/
	spinlock_t hci_ibs_lock;	/* HCI_IBS state lock	*/
	u8 tx_ibs_state;	/* HCI_IBS transmit side power state*/
	u8 rx_ibs_state;	/* HCI_IBS receive side power state */
	bool tx_vote;		/* Clock must be on for TX */
	bool rx_vote;		/* Clock must be on for RX */
	struct timer_list tx_idle_timer;
	u32 tx_idle_delay;
	struct timer_list wake_retrans_timer;
	u32 wake_retrans;
	struct workqueue_struct *workqueue;
	struct work_struct ws_awake_rx;
	struct work_struct ws_awake_device;
	struct work_struct ws_rx_vote_off;
	struct work_struct ws_tx_vote_off;
	struct work_struct ctrl_memdump_evt;
	struct delayed_work ctrl_memdump_timeout;
	struct qca_memdump_info *qca_memdump;
	unsigned long flags;
	struct completion drop_ev_comp;
	wait_queue_head_t suspend_wait_q;
	enum qca_memdump_states memdump_state;
	struct mutex hci_memdump_lock;

	u16 fw_version;
	u16 controller_id;
	/* For debugging purpose */
	u64 ibs_sent_wacks;
	u64 ibs_sent_slps;
	u64 ibs_sent_wakes;
	u64 ibs_recv_wacks;
	u64 ibs_recv_slps;
	u64 ibs_recv_wakes;
	u64 vote_last_jif;
	u32 vote_on_ms;
	u32 vote_off_ms;
	u64 tx_votes_on;
	u64 rx_votes_on;
	u64 tx_votes_off;
	u64 rx_votes_off;
	u64 votes_on;
	u64 votes_off;
};

enum qca_speed_type {
	QCA_INIT_SPEED = 1,
	QCA_OPER_SPEED
};

/*
 * Voltage regulator information required for configuring the
 * QCA Bluetooth chipset
 */
struct qca_vreg {
	const char *name;
	unsigned int load_uA;
};

struct qca_device_data {
	enum qca_btsoc_type soc_type;
	struct qca_vreg *vregs;
	size_t num_vregs;
	uint32_t capabilities;
};

/*
 * Platform data for the QCA Bluetooth power driver.
 */
struct qca_power {
	struct device *dev;
	struct regulator_bulk_data *vreg_bulk;
	int num_vregs;
	bool vregs_on;
	struct pwrseq_desc *pwrseq;
};

struct qca_serdev {
	struct hci_uart	 serdev_hu;
	struct gpio_desc *bt_en;
	struct gpio_desc *sw_ctrl;
	struct clk	 *susclk;
	enum qca_btsoc_type btsoc_type;
	struct qca_power *bt_power;
	u32 init_speed;
	u32 oper_speed;
	bool bdaddr_property_broken;
	const char *firmware_name;
};

static int qca_regulator_enable(struct qca_serdev *qcadev);
static void qca_regulator_disable(struct qca_serdev *qcadev);
static void qca_power_shutdown(struct hci_uart *hu);
static int qca_power_off(struct hci_dev *hdev);
static void qca_controller_memdump(struct work_struct *work);
static void qca_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb);

static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
{
	enum qca_btsoc_type soc_type;

	if (hu->serdev) {
		struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);

		soc_type = qsd->btsoc_type;
	} else {
		soc_type = QCA_ROME;
	}

	return soc_type;
}

static const char *qca_get_firmware_name(struct hci_uart *hu)
{
	if (hu->serdev) {
		struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);

		return qsd->firmware_name;
	} else {
		return NULL;
	}
}

static void __serial_clock_on(struct tty_struct *tty)
{
	/* TODO: Some chipset requires to enable UART clock on client
	 * side to save power consumption or manual work is required.
	 * Please put your code to control UART clock here if needed
	 */
}

static void __serial_clock_off(struct tty_struct *tty)
{
	/* TODO: Some chipset requires to disable UART clock on client
	 * side to save power consumption or manual work is required.
	 * Please put your code to control UART clock off here if needed
	 */
}

/* serial_clock_vote needs to be called with the ibs lock held */
static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
{
	struct qca_data *qca = hu->priv;
	unsigned int diff;

	bool old_vote = (qca->tx_vote | qca->rx_vote);
	bool new_vote;

	switch (vote) {
	case HCI_IBS_VOTE_STATS_UPDATE:
		diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);

		if (old_vote)
			qca->vote_off_ms += diff;
		else
			qca->vote_on_ms += diff;
		return;

	case HCI_IBS_TX_VOTE_CLOCK_ON:
		qca->tx_vote = true;
		qca->tx_votes_on++;
		break;

	case HCI_IBS_RX_VOTE_CLOCK_ON:
		qca->rx_vote = true;
		qca->rx_votes_on++;
		break;

	case HCI_IBS_TX_VOTE_CLOCK_OFF:
		qca->tx_vote = false;
		qca->tx_votes_off++;
		break;

	case HCI_IBS_RX_VOTE_CLOCK_OFF:
		qca->rx_vote = false;
		qca->rx_votes_off++;
		break;

	default:
		BT_ERR("Voting irregularity");
		return;
	}

	new_vote = qca->rx_vote | qca->tx_vote;

	if (new_vote != old_vote) {
		if (new_vote)
			__serial_clock_on(hu->tty);
		else
			__serial_clock_off(hu->tty);

		BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
		       vote ? "true" : "false");

		diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);

		if (new_vote) {
			qca->votes_on++;
			qca->vote_off_ms += diff;
		} else {
			qca->votes_off++;
			qca->vote_on_ms += diff;
		}
		qca->vote_last_jif = jiffies;
	}
}

/* Builds and sends an HCI_IBS command packet.
 * These are very simple packets with only 1 cmd byte.
 */
static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
{
	int err = 0;
	struct sk_buff *skb = NULL;
	struct qca_data *qca = hu->priv;

	BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);

	skb = bt_skb_alloc(1, GFP_ATOMIC);
	if (!skb) {
		BT_ERR("Failed to allocate memory for HCI_IBS packet");
		return -ENOMEM;
	}

	/* Assign HCI_IBS type */
	skb_put_u8(skb, cmd);

	skb_queue_tail(&qca->txq, skb);

	return err;
}

static void qca_wq_awake_device(struct work_struct *work)
{
	struct qca_data *qca = container_of(work, struct qca_data,
					    ws_awake_device);
	struct hci_uart *hu = qca->hu;
	unsigned long retrans_delay;
	unsigned long flags;

	BT_DBG("hu %p wq awake device", hu);

	/* Vote for serial clock */
	serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);

	spin_lock_irqsave(&qca->hci_ibs_lock, flags);

	/* Send wake indication to device */
	if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
		BT_ERR("Failed to send WAKE to device");

	qca->ibs_sent_wakes++;

	/* Start retransmit timer */
	retrans_delay = msecs_to_jiffies(qca->wake_retrans);
	mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

	/* Actually send the packets */
	hci_uart_tx_wakeup(hu);
}

static void qca_wq_awake_rx(struct work_struct *work)
{
	struct qca_data *qca = container_of(work, struct qca_data,
					    ws_awake_rx);
	struct hci_uart *hu = qca->hu;
	unsigned long flags;

	BT_DBG("hu %p wq awake rx", hu);

	serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);

	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
	qca->rx_ibs_state = HCI_IBS_RX_AWAKE;

	/* Always acknowledge device wake up,
	 * sending IBS message doesn't count as TX ON.
	 */
	if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
		BT_ERR("Failed to acknowledge device wake up");

	qca->ibs_sent_wacks++;

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

	/* Actually send the packets */
	hci_uart_tx_wakeup(hu);
}

static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
{
	struct qca_data *qca = container_of(work, struct qca_data,
					    ws_rx_vote_off);
	struct hci_uart *hu = qca->hu;

	BT_DBG("hu %p rx clock vote off", hu);

	serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
}

static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
{
	struct qca_data *qca = container_of(work, struct qca_data,
					    ws_tx_vote_off);
	struct hci_uart *hu = qca->hu;

	BT_DBG("hu %p tx clock vote off", hu);

	/* Run HCI tx handling unlocked */
	hci_uart_tx_wakeup(hu);

	/* Now that message queued to tty driver, vote for tty clocks off.
	 * It is up to the tty driver to pend the clocks off until tx done.
	 */
	serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
}

static void hci_ibs_tx_idle_timeout(struct timer_list *t)
{
	struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
	struct hci_uart *hu = qca->hu;
	unsigned long flags;

	BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);

	spin_lock_irqsave_nested(&qca->hci_ibs_lock,
				 flags, SINGLE_DEPTH_NESTING);

	switch (qca->tx_ibs_state) {
	case HCI_IBS_TX_AWAKE:
		/* TX_IDLE, go to SLEEP */
		if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
			BT_ERR("Failed to send SLEEP to device");
			break;
		}
		qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
		qca->ibs_sent_slps++;
		queue_work(qca->workqueue, &qca->ws_tx_vote_off);
		break;

	case HCI_IBS_TX_ASLEEP:
	case HCI_IBS_TX_WAKING:
	default:
		BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
		break;
	}

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
}

static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
{
	struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
	struct hci_uart *hu = qca->hu;
	unsigned long flags, retrans_delay;
	bool retransmit = false;

	BT_DBG("hu %p wake retransmit timeout in %d state",
		hu, qca->tx_ibs_state);

	spin_lock_irqsave_nested(&qca->hci_ibs_lock,
				 flags, SINGLE_DEPTH_NESTING);

	/* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */
	if (test_bit(QCA_SUSPENDING, &qca->flags)) {
		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
		return;
	}

	switch (qca->tx_ibs_state) {
	case HCI_IBS_TX_WAKING:
		/* No WAKE_ACK, retransmit WAKE */
		retransmit = true;
		if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
			BT_ERR("Failed to acknowledge device wake up");
			break;
		}
		qca->ibs_sent_wakes++;
		retrans_delay = msecs_to_jiffies(qca->wake_retrans);
		mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
		break;

	case HCI_IBS_TX_ASLEEP:
	case HCI_IBS_TX_AWAKE:
	default:
		BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
		break;
	}

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

	if (retransmit)
		hci_uart_tx_wakeup(hu);
}


static void qca_controller_memdump_timeout(struct work_struct *work)
{
	struct qca_data *qca = container_of(work, struct qca_data,
					ctrl_memdump_timeout.work);
	struct hci_uart *hu = qca->hu;

	mutex_lock(&qca->hci_memdump_lock);
	if (test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
		qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
		if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
			/* Inject hw error event to reset the device
			 * and driver.
			 */
			hci_reset_dev(hu->hdev);
		}
	}

	mutex_unlock(&qca->hci_memdump_lock);
}


/* Initialize protocol */
static int qca_open(struct hci_uart *hu)
{
	struct qca_serdev *qcadev;
	struct qca_data *qca;

	BT_DBG("hu %p qca_open", hu);

	if (!hci_uart_has_flow_control(hu))
		return -EOPNOTSUPP;

	qca = kzalloc(sizeof(*qca), GFP_KERNEL);
	if (!qca)
		return -ENOMEM;

	skb_queue_head_init(&qca->txq);
	skb_queue_head_init(&qca->tx_wait_q);
	skb_queue_head_init(&qca->rx_memdump_q);
	spin_lock_init(&qca->hci_ibs_lock);
	mutex_init(&qca->hci_memdump_lock);
	qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
	if (!qca->workqueue) {
		BT_ERR("QCA Workqueue not initialized properly");
		kfree(qca);
		return -ENOMEM;
	}

	INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
	INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
	INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
	INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
	INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
	INIT_DELAYED_WORK(&qca->ctrl_memdump_timeout,
			  qca_controller_memdump_timeout);
	init_waitqueue_head(&qca->suspend_wait_q);

	qca->hu = hu;
	init_completion(&qca->drop_ev_comp);

	/* Assume we start with both sides asleep -- extra wakes OK */
	qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
	qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;

	qca->vote_last_jif = jiffies;

	hu->priv = qca;

	if (hu->serdev) {
		qcadev = serdev_device_get_drvdata(hu->serdev);

		switch (qcadev->btsoc_type) {
		case QCA_WCN3988:
		case QCA_WCN3990:
		case QCA_WCN3991:
		case QCA_WCN3998:
		case QCA_WCN6750:
			hu->init_speed = qcadev->init_speed;
			break;

		default:
			break;
		}

		if (qcadev->oper_speed)
			hu->oper_speed = qcadev->oper_speed;
	}

	timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
	qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;

	timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
	qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS;

	BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
	       qca->tx_idle_delay, qca->wake_retrans);

	return 0;
}

static void qca_debugfs_init(struct hci_dev *hdev)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;
	struct dentry *ibs_dir;
	umode_t mode;

	if (!hdev->debugfs)
		return;

	if (test_and_set_bit(QCA_DEBUGFS_CREATED, &qca->flags))
		return;

	ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);

	/* read only */
	mode = 0444;
	debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
	debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
	debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
			   &qca->ibs_sent_slps);
	debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
			   &qca->ibs_sent_wakes);
	debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
			   &qca->ibs_sent_wacks);
	debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
			   &qca->ibs_recv_slps);
	debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
			   &qca->ibs_recv_wakes);
	debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
			   &qca->ibs_recv_wacks);
	debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
	debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
	debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
	debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
	debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
	debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
	debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
	debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
	debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
	debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);

	/* read/write */
	mode = 0644;
	debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
	debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
			   &qca->tx_idle_delay);
}

/* Flush protocol data */
static int qca_flush(struct hci_uart *hu)
{
	struct qca_data *qca = hu->priv;

	BT_DBG("hu %p qca flush", hu);

	skb_queue_purge(&qca->tx_wait_q);
	skb_queue_purge(&qca->txq);

	return 0;
}

/* Close protocol */
static int qca_close(struct hci_uart *hu)
{
	struct qca_data *qca = hu->priv;

	BT_DBG("hu %p qca close", hu);

	serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);

	skb_queue_purge(&qca->tx_wait_q);
	skb_queue_purge(&qca->txq);
	skb_queue_purge(&qca->rx_memdump_q);
	/*
	 * Shut the timers down so they can't be rearmed when
	 * destroy_workqueue() drains pending work which in turn might try
	 * to arm a timer.  After shutdown rearm attempts are silently
	 * ignored by the timer core code.
	 */
	timer_shutdown_sync(&qca->tx_idle_timer);
	timer_shutdown_sync(&qca->wake_retrans_timer);
	destroy_workqueue(qca->workqueue);
	qca->hu = NULL;

	kfree_skb(qca->rx_skb);

	hu->priv = NULL;

	kfree(qca);

	return 0;
}

/* Called upon a wake-up-indication from the device.
 */
static void device_want_to_wakeup(struct hci_uart *hu)
{
	unsigned long flags;
	struct qca_data *qca = hu->priv;

	BT_DBG("hu %p want to wake up", hu);

	spin_lock_irqsave(&qca->hci_ibs_lock, flags);

	qca->ibs_recv_wakes++;

	/* Don't wake the rx up when suspending. */
	if (test_bit(QCA_SUSPENDING, &qca->flags)) {
		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
		return;
	}

	switch (qca->rx_ibs_state) {
	case HCI_IBS_RX_ASLEEP:
		/* Make sure clock is on - we may have turned clock off since
		 * receiving the wake up indicator awake rx clock.
		 */
		queue_work(qca->workqueue, &qca->ws_awake_rx);
		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
		return;

	case HCI_IBS_RX_AWAKE:
		/* Always acknowledge device wake up,
		 * sending IBS message doesn't count as TX ON.
		 */
		if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
			BT_ERR("Failed to acknowledge device wake up");
			break;
		}
		qca->ibs_sent_wacks++;
		break;

	default:
		/* Any other state is illegal */
		BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
		       qca->rx_ibs_state);
		break;
	}

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

	/* Actually send the packets */
	hci_uart_tx_wakeup(hu);
}

/* Called upon a sleep-indication from the device.
 */
static void device_want_to_sleep(struct hci_uart *hu)
{
	unsigned long flags;
	struct qca_data *qca = hu->priv;

	BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);

	spin_lock_irqsave(&qca->hci_ibs_lock, flags);

	qca->ibs_recv_slps++;

	switch (qca->rx_ibs_state) {
	case HCI_IBS_RX_AWAKE:
		/* Update state */
		qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
		/* Vote off rx clock under workqueue */
		queue_work(qca->workqueue, &qca->ws_rx_vote_off);
		break;

	case HCI_IBS_RX_ASLEEP:
		break;

	default:
		/* Any other state is illegal */
		BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
		       qca->rx_ibs_state);
		break;
	}

	wake_up_interruptible(&qca->suspend_wait_q);

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
}

/* Called upon wake-up-acknowledgement from the device
 */
static void device_woke_up(struct hci_uart *hu)
{
	unsigned long flags, idle_delay;
	struct qca_data *qca = hu->priv;
	struct sk_buff *skb = NULL;

	BT_DBG("hu %p woke up", hu);

	spin_lock_irqsave(&qca->hci_ibs_lock, flags);

	qca->ibs_recv_wacks++;

	/* Don't react to the wake-up-acknowledgment when suspending. */
	if (test_bit(QCA_SUSPENDING, &qca->flags)) {
		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
		return;
	}

	switch (qca->tx_ibs_state) {
	case HCI_IBS_TX_AWAKE:
		/* Expect one if we send 2 WAKEs */
		BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
		       qca->tx_ibs_state);
		break;

	case HCI_IBS_TX_WAKING:
		/* Send pending packets */
		while ((skb = skb_dequeue(&qca->tx_wait_q)))
			skb_queue_tail(&qca->txq, skb);

		/* Switch timers and change state to HCI_IBS_TX_AWAKE */
		del_timer(&qca->wake_retrans_timer);
		idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
		mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
		qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
		break;

	case HCI_IBS_TX_ASLEEP:
	default:
		BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
		       qca->tx_ibs_state);
		break;
	}

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

	/* Actually send the packets */
	hci_uart_tx_wakeup(hu);
}

/* Enqueue frame for transmittion (padding, crc, etc) may be called from
 * two simultaneous tasklets.
 */
static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
	unsigned long flags = 0, idle_delay;
	struct qca_data *qca = hu->priv;

	BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
	       qca->tx_ibs_state);

	if (test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
		/* As SSR is in progress, ignore the packets */
		bt_dev_dbg(hu->hdev, "SSR is in progress");
		kfree_skb(skb);
		return 0;
	}

	/* Prepend skb with frame type */
	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);

	spin_lock_irqsave(&qca->hci_ibs_lock, flags);

	/* Don't go to sleep in middle of patch download or
	 * Out-Of-Band(GPIOs control) sleep is selected.
	 * Don't wake the device up when suspending.
	 */
	if (test_bit(QCA_IBS_DISABLED, &qca->flags) ||
	    test_bit(QCA_SUSPENDING, &qca->flags)) {
		skb_queue_tail(&qca->txq, skb);
		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
		return 0;
	}

	/* Act according to current state */
	switch (qca->tx_ibs_state) {
	case HCI_IBS_TX_AWAKE:
		BT_DBG("Device awake, sending normally");
		skb_queue_tail(&qca->txq, skb);
		idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
		mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
		break;

	case HCI_IBS_TX_ASLEEP:
		BT_DBG("Device asleep, waking up and queueing packet");
		/* Save packet for later */
		skb_queue_tail(&qca->tx_wait_q, skb);

		qca->tx_ibs_state = HCI_IBS_TX_WAKING;
		/* Schedule a work queue to wake up device */
		queue_work(qca->workqueue, &qca->ws_awake_device);
		break;

	case HCI_IBS_TX_WAKING:
		BT_DBG("Device waking up, queueing packet");
		/* Transient state; just keep packet for later */
		skb_queue_tail(&qca->tx_wait_q, skb);
		break;

	default:
		BT_ERR("Illegal tx state: %d (losing packet)",
		       qca->tx_ibs_state);
		dev_kfree_skb_irq(skb);
		break;
	}

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

	return 0;
}

static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);

	BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);

	device_want_to_sleep(hu);

	kfree_skb(skb);
	return 0;
}

static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);

	BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);

	device_want_to_wakeup(hu);

	kfree_skb(skb);
	return 0;
}

static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);

	BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);

	device_woke_up(hu);

	kfree_skb(skb);
	return 0;
}

static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
{
	/* We receive debug logs from chip as an ACL packets.
	 * Instead of sending the data to ACL to decode the
	 * received data, we are pushing them to the above layers
	 * as a diagnostic packet.
	 */
	if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
		return hci_recv_diag(hdev, skb);

	return hci_recv_frame(hdev, skb);
}

static void qca_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;
	char buf[80];

	snprintf(buf, sizeof(buf), "Controller Name: 0x%x\n",
		qca->controller_id);
	skb_put_data(skb, buf, strlen(buf));

	snprintf(buf, sizeof(buf), "Firmware Version: 0x%x\n",
		qca->fw_version);
	skb_put_data(skb, buf, strlen(buf));

	snprintf(buf, sizeof(buf), "Vendor:Qualcomm\n");
	skb_put_data(skb, buf, strlen(buf));

	snprintf(buf, sizeof(buf), "Driver: %s\n",
		hu->serdev->dev.driver->name);
	skb_put_data(skb, buf, strlen(buf));
}

static void qca_controller_memdump(struct work_struct *work)
{
	struct qca_data *qca = container_of(work, struct qca_data,
					    ctrl_memdump_evt);
	struct hci_uart *hu = qca->hu;
	struct sk_buff *skb;
	struct qca_memdump_event_hdr *cmd_hdr;
	struct qca_memdump_info *qca_memdump = qca->qca_memdump;
	struct qca_dump_size *dump;
	u16 seq_no;
	u32 rx_size;
	int ret = 0;
	enum qca_btsoc_type soc_type = qca_soc_type(hu);

	while ((skb = skb_dequeue(&qca->rx_memdump_q))) {

		mutex_lock(&qca->hci_memdump_lock);
		/* Skip processing the received packets if timeout detected
		 * or memdump collection completed.
		 */
		if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
		    qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
			mutex_unlock(&qca->hci_memdump_lock);
			return;
		}

		if (!qca_memdump) {
			qca_memdump = kzalloc(sizeof(*qca_memdump), GFP_ATOMIC);
			if (!qca_memdump) {
				mutex_unlock(&qca->hci_memdump_lock);
				return;
			}

			qca->qca_memdump = qca_memdump;
		}

		qca->memdump_state = QCA_MEMDUMP_COLLECTING;
		cmd_hdr = (void *) skb->data;
		seq_no = __le16_to_cpu(cmd_hdr->seq_no);
		skb_pull(skb, sizeof(struct qca_memdump_event_hdr));

		if (!seq_no) {

			/* This is the first frame of memdump packet from
			 * the controller, Disable IBS to recevie dump
			 * with out any interruption, ideally time required for
			 * the controller to send the dump is 8 seconds. let us
			 * start timer to handle this asynchronous activity.
			 */
			set_bit(QCA_IBS_DISABLED, &qca->flags);
			set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
			dump = (void *) skb->data;
			qca_memdump->ram_dump_size = __le32_to_cpu(dump->dump_size);
			if (!(qca_memdump->ram_dump_size)) {
				bt_dev_err(hu->hdev, "Rx invalid memdump size");
				kfree(qca_memdump);
				kfree_skb(skb);
				mutex_unlock(&qca->hci_memdump_lock);
				return;
			}

			queue_delayed_work(qca->workqueue,
					   &qca->ctrl_memdump_timeout,
					   msecs_to_jiffies(MEMDUMP_TIMEOUT_MS));
			skb_pull(skb, sizeof(qca_memdump->ram_dump_size));
			qca_memdump->current_seq_no = 0;
			qca_memdump->received_dump = 0;
			ret = hci_devcd_init(hu->hdev, qca_memdump->ram_dump_size);
			bt_dev_info(hu->hdev, "hci_devcd_init Return:%d",
				    ret);
			if (ret < 0) {
				kfree(qca->qca_memdump);
				qca->qca_memdump = NULL;
				qca->memdump_state = QCA_MEMDUMP_COLLECTED;
				cancel_delayed_work(&qca->ctrl_memdump_timeout);
				clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
				mutex_unlock(&qca->hci_memdump_lock);
				return;
			}

			bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
				    qca_memdump->ram_dump_size);

		}

		/* If sequence no 0 is missed then there is no point in
		 * accepting the other sequences.
		 */
		if (!test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
			bt_dev_err(hu->hdev, "QCA: Discarding other packets");
			kfree(qca_memdump);
			kfree_skb(skb);
			mutex_unlock(&qca->hci_memdump_lock);
			return;
		}
		/* There could be chance of missing some packets from
		 * the controller. In such cases let us store the dummy
		 * packets in the buffer.
		 */
		/* For QCA6390, controller does not lost packets but
		 * sequence number field of packet sometimes has error
		 * bits, so skip this checking for missing packet.
		 */
		while ((seq_no > qca_memdump->current_seq_no + 1) &&
			(soc_type != QCA_QCA6390) &&
			seq_no != QCA_LAST_SEQUENCE_NUM) {
			bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
				   qca_memdump->current_seq_no);
			rx_size = qca_memdump->received_dump;
			rx_size += QCA_DUMP_PACKET_SIZE;
			if (rx_size > qca_memdump->ram_dump_size) {
				bt_dev_err(hu->hdev,
					   "QCA memdump received %d, no space for missed packet",
					   qca_memdump->received_dump);
				break;
			}
			hci_devcd_append_pattern(hu->hdev, 0x00,
				QCA_DUMP_PACKET_SIZE);
			qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
			qca_memdump->current_seq_no++;
		}

		rx_size = qca_memdump->received_dump  + skb->len;
		if (rx_size <= qca_memdump->ram_dump_size) {
			if ((seq_no != QCA_LAST_SEQUENCE_NUM) &&
			    (seq_no != qca_memdump->current_seq_no)) {
				bt_dev_err(hu->hdev,
					   "QCA memdump unexpected packet %d",
					   seq_no);
			}
			bt_dev_dbg(hu->hdev,
				   "QCA memdump packet %d with length %d",
				   seq_no, skb->len);
			hci_devcd_append(hu->hdev, skb);
			qca_memdump->current_seq_no += 1;
			qca_memdump->received_dump = rx_size;
		} else {
			bt_dev_err(hu->hdev,
				   "QCA memdump received no space for packet %d",
				    qca_memdump->current_seq_no);
		}

		if (seq_no == QCA_LAST_SEQUENCE_NUM) {
			bt_dev_info(hu->hdev,
				"QCA memdump Done, received %d, total %d",
				qca_memdump->received_dump,
				qca_memdump->ram_dump_size);
			hci_devcd_complete(hu->hdev);
			cancel_delayed_work(&qca->ctrl_memdump_timeout);
			kfree(qca->qca_memdump);
			qca->qca_memdump = NULL;
			qca->memdump_state = QCA_MEMDUMP_COLLECTED;
			clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
		}

		mutex_unlock(&qca->hci_memdump_lock);
	}

}

static int qca_controller_memdump_event(struct hci_dev *hdev,
					struct sk_buff *skb)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;

	set_bit(QCA_SSR_TRIGGERED, &qca->flags);
	skb_queue_tail(&qca->rx_memdump_q, skb);
	queue_work(qca->workqueue, &qca->ctrl_memdump_evt);

	return 0;
}

static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;

	if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
		struct hci_event_hdr *hdr = (void *)skb->data;

		/* For the WCN3990 the vendor command for a baudrate change
		 * isn't sent as synchronous HCI command, because the
		 * controller sends the corresponding vendor event with the
		 * new baudrate. The event is received and properly decoded
		 * after changing the baudrate of the host port. It needs to
		 * be dropped, otherwise it can be misinterpreted as
		 * response to a later firmware download command (also a
		 * vendor command).
		 */

		if (hdr->evt == HCI_EV_VENDOR)
			complete(&qca->drop_ev_comp);

		kfree_skb(skb);

		return 0;
	}
	/* We receive chip memory dump as an event packet, With a dedicated
	 * handler followed by a hardware error event. When this event is
	 * received we store dump into a file before closing hci. This
	 * dump will help in triaging the issues.
	 */
	if ((skb->data[0] == HCI_VENDOR_PKT) &&
	    (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
		return qca_controller_memdump_event(hdev, skb);

	return hci_recv_frame(hdev, skb);
}

#define QCA_IBS_SLEEP_IND_EVENT \
	.type = HCI_IBS_SLEEP_IND, \
	.hlen = 0, \
	.loff = 0, \
	.lsize = 0, \
	.maxlen = HCI_MAX_IBS_SIZE

#define QCA_IBS_WAKE_IND_EVENT \
	.type = HCI_IBS_WAKE_IND, \
	.hlen = 0, \
	.loff = 0, \
	.lsize = 0, \
	.maxlen = HCI_MAX_IBS_SIZE

#define QCA_IBS_WAKE_ACK_EVENT \
	.type = HCI_IBS_WAKE_ACK, \
	.hlen = 0, \
	.loff = 0, \
	.lsize = 0, \
	.maxlen = HCI_MAX_IBS_SIZE

static const struct h4_recv_pkt qca_recv_pkts[] = {
	{ H4_RECV_ACL,             .recv = qca_recv_acl_data },
	{ H4_RECV_SCO,             .recv = hci_recv_frame    },
	{ H4_RECV_EVENT,           .recv = qca_recv_event    },
	{ QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
	{ QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
	{ QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
};

static int qca_recv(struct hci_uart *hu, const void *data, int count)
{
	struct qca_data *qca = hu->priv;

	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
		return -EUNATCH;

	qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
				  qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
	if (IS_ERR(qca->rx_skb)) {
		int err = PTR_ERR(qca->rx_skb);
		bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
		qca->rx_skb = NULL;
		return err;
	}

	return count;
}

static struct sk_buff *qca_dequeue(struct hci_uart *hu)
{
	struct qca_data *qca = hu->priv;

	return skb_dequeue(&qca->txq);
}

static uint8_t qca_get_baudrate_value(int speed)
{
	switch (speed) {
	case 9600:
		return QCA_BAUDRATE_9600;
	case 19200:
		return QCA_BAUDRATE_19200;
	case 38400:
		return QCA_BAUDRATE_38400;
	case 57600:
		return QCA_BAUDRATE_57600;
	case 115200:
		return QCA_BAUDRATE_115200;
	case 230400:
		return QCA_BAUDRATE_230400;
	case 460800:
		return QCA_BAUDRATE_460800;
	case 500000:
		return QCA_BAUDRATE_500000;
	case 921600:
		return QCA_BAUDRATE_921600;
	case 1000000:
		return QCA_BAUDRATE_1000000;
	case 2000000:
		return QCA_BAUDRATE_2000000;
	case 3000000:
		return QCA_BAUDRATE_3000000;
	case 3200000:
		return QCA_BAUDRATE_3200000;
	case 3500000:
		return QCA_BAUDRATE_3500000;
	default:
		return QCA_BAUDRATE_115200;
	}
}

static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;
	struct sk_buff *skb;
	u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };

	if (baudrate > QCA_BAUDRATE_3200000)
		return -EINVAL;

	cmd[4] = baudrate;

	skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
	if (!skb) {
		bt_dev_err(hdev, "Failed to allocate baudrate packet");
		return -ENOMEM;
	}

	/* Assign commands to change baudrate and packet type. */
	skb_put_data(skb, cmd, sizeof(cmd));
	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;

	skb_queue_tail(&qca->txq, skb);
	hci_uart_tx_wakeup(hu);

	/* Wait for the baudrate change request to be sent */

	while (!skb_queue_empty(&qca->txq))
		usleep_range(100, 200);

	if (hu->serdev)
		serdev_device_wait_until_sent(hu->serdev,
		      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));

	/* Give the controller time to process the request */
	switch (qca_soc_type(hu)) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
	case QCA_WCN6750:
	case QCA_WCN6855:
	case QCA_WCN7850:
		usleep_range(1000, 10000);
		break;

	default:
		msleep(300);
	}

	return 0;
}

static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
	if (hu->serdev)
		serdev_device_set_baudrate(hu->serdev, speed);
	else
		hci_uart_set_baudrate(hu, speed);
}

static int qca_send_power_pulse(struct hci_uart *hu, bool on)
{
	int ret;
	int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
	u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;

	/* These power pulses are single byte command which are sent
	 * at required baudrate to wcn3990. On wcn3990, we have an external
	 * circuit at Tx pin which decodes the pulse sent at specific baudrate.
	 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
	 * and also we use the same power inputs to turn on and off for
	 * Wi-Fi/BT. Powering up the power sources will not enable BT, until
	 * we send a power on pulse at 115200 bps. This algorithm will help to
	 * save power. Disabling hardware flow control is mandatory while
	 * sending power pulses to SoC.
	 */
	bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);

	serdev_device_write_flush(hu->serdev);
	hci_uart_set_flow_control(hu, true);
	ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
	if (ret < 0) {
		bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
		return ret;
	}

	serdev_device_wait_until_sent(hu->serdev, timeout);
	hci_uart_set_flow_control(hu, false);

	/* Give to controller time to boot/shutdown */
	if (on)
		msleep(100);
	else
		usleep_range(1000, 10000);

	return 0;
}

static unsigned int qca_get_speed(struct hci_uart *hu,
				  enum qca_speed_type speed_type)
{
	unsigned int speed = 0;

	if (speed_type == QCA_INIT_SPEED) {
		if (hu->init_speed)
			speed = hu->init_speed;
		else if (hu->proto->init_speed)
			speed = hu->proto->init_speed;
	} else {
		if (hu->oper_speed)
			speed = hu->oper_speed;
		else if (hu->proto->oper_speed)
			speed = hu->proto->oper_speed;
	}

	return speed;
}

static int qca_check_speeds(struct hci_uart *hu)
{
	switch (qca_soc_type(hu)) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
	case QCA_WCN6750:
	case QCA_WCN6855:
	case QCA_WCN7850:
		if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
		    !qca_get_speed(hu, QCA_OPER_SPEED))
			return -EINVAL;
		break;

	default:
		if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
		    !qca_get_speed(hu, QCA_OPER_SPEED))
			return -EINVAL;
	}

	return 0;
}

static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
{
	unsigned int speed, qca_baudrate;
	struct qca_data *qca = hu->priv;
	int ret = 0;

	if (speed_type == QCA_INIT_SPEED) {
		speed = qca_get_speed(hu, QCA_INIT_SPEED);
		if (speed)
			host_set_baudrate(hu, speed);
	} else {
		enum qca_btsoc_type soc_type = qca_soc_type(hu);

		speed = qca_get_speed(hu, QCA_OPER_SPEED);
		if (!speed)
			return 0;

		/* Disable flow control for wcn3990 to deassert RTS while
		 * changing the baudrate of chip and host.
		 */
		switch (soc_type) {
		case QCA_WCN3988:
		case QCA_WCN3990:
		case QCA_WCN3991:
		case QCA_WCN3998:
		case QCA_WCN6750:
		case QCA_WCN6855:
		case QCA_WCN7850:
			hci_uart_set_flow_control(hu, true);
			break;

		default:
			break;
		}

		switch (soc_type) {
		case QCA_WCN3990:
			reinit_completion(&qca->drop_ev_comp);
			set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
			break;

		default:
			break;
		}

		qca_baudrate = qca_get_baudrate_value(speed);
		bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
		ret = qca_set_baudrate(hu->hdev, qca_baudrate);
		if (ret)
			goto error;

		host_set_baudrate(hu, speed);

error:
		switch (soc_type) {
		case QCA_WCN3988:
		case QCA_WCN3990:
		case QCA_WCN3991:
		case QCA_WCN3998:
		case QCA_WCN6750:
		case QCA_WCN6855:
		case QCA_WCN7850:
			hci_uart_set_flow_control(hu, false);
			break;

		default:
			break;
		}

		switch (soc_type) {
		case QCA_WCN3990:
			/* Wait for the controller to send the vendor event
			 * for the baudrate change command.
			 */
			if (!wait_for_completion_timeout(&qca->drop_ev_comp,
						 msecs_to_jiffies(100))) {
				bt_dev_err(hu->hdev,
					   "Failed to change controller baudrate\n");
				ret = -ETIMEDOUT;
			}

			clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
			break;

		default:
			break;
		}
	}

	return ret;
}

static int qca_send_crashbuffer(struct hci_uart *hu)
{
	struct qca_data *qca = hu->priv;
	struct sk_buff *skb;

	skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
	if (!skb) {
		bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
		return -ENOMEM;
	}

	/* We forcefully crash the controller, by sending 0xfb byte for
	 * 1024 times. We also might have chance of losing data, To be
	 * on safer side we send 1096 bytes to the SoC.
	 */
	memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
	       QCA_CRASHBYTE_PACKET_LEN);
	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
	bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
	skb_queue_tail(&qca->txq, skb);
	hci_uart_tx_wakeup(hu);

	return 0;
}

static void qca_wait_for_dump_collection(struct hci_dev *hdev)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;

	wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
			    TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);

	clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
}

static void qca_hw_error(struct hci_dev *hdev, u8 code)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;

	set_bit(QCA_SSR_TRIGGERED, &qca->flags);
	set_bit(QCA_HW_ERROR_EVENT, &qca->flags);
	bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);

	if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
		/* If hardware error event received for other than QCA
		 * soc memory dump event, then we need to crash the SOC
		 * and wait here for 8 seconds to get the dump packets.
		 * This will block main thread to be on hold until we
		 * collect dump.
		 */
		set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
		qca_send_crashbuffer(hu);
		qca_wait_for_dump_collection(hdev);
	} else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
		/* Let us wait here until memory dump collected or
		 * memory dump timer expired.
		 */
		bt_dev_info(hdev, "waiting for dump to complete");
		qca_wait_for_dump_collection(hdev);
	}

	mutex_lock(&qca->hci_memdump_lock);
	if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
		bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
		hci_devcd_abort(hu->hdev);
		if (qca->qca_memdump) {
			kfree(qca->qca_memdump);
			qca->qca_memdump = NULL;
		}
		qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
		cancel_delayed_work(&qca->ctrl_memdump_timeout);
	}
	mutex_unlock(&qca->hci_memdump_lock);

	if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
	    qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
		cancel_work_sync(&qca->ctrl_memdump_evt);
		skb_queue_purge(&qca->rx_memdump_q);
	}

	clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);
}

static void qca_cmd_timeout(struct hci_dev *hdev)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;

	set_bit(QCA_SSR_TRIGGERED, &qca->flags);
	if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
		set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
		qca_send_crashbuffer(hu);
		qca_wait_for_dump_collection(hdev);
	} else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
		/* Let us wait here until memory dump collected or
		 * memory dump timer expired.
		 */
		bt_dev_info(hdev, "waiting for dump to complete");
		qca_wait_for_dump_collection(hdev);
	}

	mutex_lock(&qca->hci_memdump_lock);
	if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
		qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
		if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
			/* Inject hw error event to reset the device
			 * and driver.
			 */
			hci_reset_dev(hu->hdev);
		}
	}
	mutex_unlock(&qca->hci_memdump_lock);
}

static bool qca_wakeup(struct hci_dev *hdev)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	bool wakeup;

	if (!hu->serdev)
		return true;

	/* BT SoC attached through the serial bus is handled by the serdev driver.
	 * So we need to use the device handle of the serdev driver to get the
	 * status of device may wakeup.
	 */
	wakeup = device_may_wakeup(&hu->serdev->ctrl->dev);
	bt_dev_dbg(hu->hdev, "wakeup status : %d", wakeup);

	return wakeup;
}

static int qca_port_reopen(struct hci_uart *hu)
{
	int ret;

	/* Now the device is in ready state to communicate with host.
	 * To sync host with device we need to reopen port.
	 * Without this, we will have RTS and CTS synchronization
	 * issues.
	 */
	serdev_device_close(hu->serdev);
	ret = serdev_device_open(hu->serdev);
	if (ret) {
		bt_dev_err(hu->hdev, "failed to open port");
		return ret;
	}

	hci_uart_set_flow_control(hu, false);

	return 0;
}

static int qca_regulator_init(struct hci_uart *hu)
{
	enum qca_btsoc_type soc_type = qca_soc_type(hu);
	struct qca_serdev *qcadev;
	int ret;
	bool sw_ctrl_state;

	/* Check for vregs status, may be hci down has turned
	 * off the voltage regulator.
	 */
	qcadev = serdev_device_get_drvdata(hu->serdev);

	if (!qcadev->bt_power->vregs_on) {
		serdev_device_close(hu->serdev);
		ret = qca_regulator_enable(qcadev);
		if (ret)
			return ret;

		ret = serdev_device_open(hu->serdev);
		if (ret) {
			bt_dev_err(hu->hdev, "failed to open port");
			return ret;
		}
	}

	switch (soc_type) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
		/* Forcefully enable wcn399x to enter in to boot mode. */
		host_set_baudrate(hu, 2400);
		ret = qca_send_power_pulse(hu, false);
		if (ret)
			return ret;
		break;

	default:
		break;
	}

	/* For wcn6750 need to enable gpio bt_en */
	if (qcadev->bt_en) {
		gpiod_set_value_cansleep(qcadev->bt_en, 0);
		msleep(50);
		gpiod_set_value_cansleep(qcadev->bt_en, 1);
		msleep(50);
		if (qcadev->sw_ctrl) {
			sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
			bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
		}
	}

	qca_set_speed(hu, QCA_INIT_SPEED);

	switch (soc_type) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
		ret = qca_send_power_pulse(hu, true);
		if (ret)
			return ret;
		break;

	default:
		break;
	}

	return qca_port_reopen(hu);
}

static int qca_power_on(struct hci_dev *hdev)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	enum qca_btsoc_type soc_type = qca_soc_type(hu);
	struct qca_serdev *qcadev;
	struct qca_data *qca = hu->priv;
	int ret = 0;

	/* Non-serdev device usually is powered by external power
	 * and don't need additional action in driver for power on
	 */
	if (!hu->serdev)
		return 0;

	switch (soc_type) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
	case QCA_WCN6750:
	case QCA_WCN6855:
	case QCA_WCN7850:
	case QCA_QCA6390:
		ret = qca_regulator_init(hu);
		break;

	default:
		qcadev = serdev_device_get_drvdata(hu->serdev);
		if (qcadev->bt_en) {
			gpiod_set_value_cansleep(qcadev->bt_en, 1);
			/* Controller needs time to bootup. */
			msleep(150);
		}
	}

	clear_bit(QCA_BT_OFF, &qca->flags);
	return ret;
}

static void hci_coredump_qca(struct hci_dev *hdev)
{
	int err;
	static const u8 param[] = { 0x26 };

	err = __hci_cmd_send(hdev, 0xfc0c, 1, param);
	if (err < 0)
		bt_dev_err(hdev, "%s: trigger crash failed (%d)", __func__, err);
}

static int qca_get_data_path_id(struct hci_dev *hdev, __u8 *data_path_id)
{
	/* QCA uses 1 as non-HCI data path id for HFP */
	*data_path_id = 1;
	return 0;
}

static int qca_configure_hfp_offload(struct hci_dev *hdev)
{
	bt_dev_info(hdev, "HFP non-HCI data transport is supported");
	hdev->get_data_path_id = qca_get_data_path_id;
	/* Do not need to send HCI_Configure_Data_Path to configure non-HCI
	 * data transport path for QCA controllers, so set below field as NULL.
	 */
	hdev->get_codec_config_data = NULL;
	return 0;
}

static int qca_setup(struct hci_uart *hu)
{
	struct hci_dev *hdev = hu->hdev;
	struct qca_data *qca = hu->priv;
	unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
	unsigned int retries = 0;
	enum qca_btsoc_type soc_type = qca_soc_type(hu);
	const char *firmware_name = qca_get_firmware_name(hu);
	int ret;
	struct qca_btsoc_version ver;
	struct qca_serdev *qcadev;
	const char *soc_name;

	ret = qca_check_speeds(hu);
	if (ret)
		return ret;

	clear_bit(QCA_ROM_FW, &qca->flags);
	/* Patch downloading has to be done without IBS mode */
	set_bit(QCA_IBS_DISABLED, &qca->flags);

	/* Enable controller to do both LE scan and BR/EDR inquiry
	 * simultaneously.
	 */
	set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);

	switch (soc_type) {
	case QCA_QCA2066:
		soc_name = "qca2066";
		break;

	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
		soc_name = "wcn399x";
		break;

	case QCA_WCN6750:
		soc_name = "wcn6750";
		break;

	case QCA_WCN6855:
		soc_name = "wcn6855";
		break;

	case QCA_WCN7850:
		soc_name = "wcn7850";
		break;

	default:
		soc_name = "ROME/QCA6390";
	}
	bt_dev_info(hdev, "setting up %s", soc_name);

	qca->memdump_state = QCA_MEMDUMP_IDLE;

retry:
	ret = qca_power_on(hdev);
	if (ret)
		goto out;

	clear_bit(QCA_SSR_TRIGGERED, &qca->flags);

	switch (soc_type) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
	case QCA_WCN6750:
	case QCA_WCN6855:
	case QCA_WCN7850:
		qcadev = serdev_device_get_drvdata(hu->serdev);
		if (qcadev->bdaddr_property_broken)
			set_bit(HCI_QUIRK_BDADDR_PROPERTY_BROKEN, &hdev->quirks);

		hci_set_aosp_capable(hdev);

		ret = qca_read_soc_version(hdev, &ver, soc_type);
		if (ret)
			goto out;
		break;

	default:
		qca_set_speed(hu, QCA_INIT_SPEED);
	}

	/* Setup user speed if needed */
	speed = qca_get_speed(hu, QCA_OPER_SPEED);
	if (speed) {
		ret = qca_set_speed(hu, QCA_OPER_SPEED);
		if (ret)
			goto out;

		qca_baudrate = qca_get_baudrate_value(speed);
	}

	switch (soc_type) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
	case QCA_WCN6750:
	case QCA_WCN6855:
	case QCA_WCN7850:
		break;

	default:
		/* Get QCA version information */
		ret = qca_read_soc_version(hdev, &ver, soc_type);
		if (ret)
			goto out;
	}

	/* Setup patch / NVM configurations */
	ret = qca_uart_setup(hdev, qca_baudrate, soc_type, ver,
			firmware_name);
	if (!ret) {
		clear_bit(QCA_IBS_DISABLED, &qca->flags);
		qca_debugfs_init(hdev);
		hu->hdev->hw_error = qca_hw_error;
		hu->hdev->cmd_timeout = qca_cmd_timeout;
		if (hu->serdev) {
			if (device_can_wakeup(hu->serdev->ctrl->dev.parent))
				hu->hdev->wakeup = qca_wakeup;
		}
	} else if (ret == -ENOENT) {
		/* No patch/nvm-config found, run with original fw/config */
		set_bit(QCA_ROM_FW, &qca->flags);
		ret = 0;
	} else if (ret == -EAGAIN) {
		/*
		 * Userspace firmware loader will return -EAGAIN in case no
		 * patch/nvm-config is found, so run with original fw/config.
		 */
		set_bit(QCA_ROM_FW, &qca->flags);
		ret = 0;
	}

out:
	if (ret && retries < MAX_INIT_RETRIES) {
		bt_dev_warn(hdev, "Retry BT power ON:%d", retries);
		qca_power_shutdown(hu);
		if (hu->serdev) {
			serdev_device_close(hu->serdev);
			ret = serdev_device_open(hu->serdev);
			if (ret) {
				bt_dev_err(hdev, "failed to open port");
				return ret;
			}
		}
		retries++;
		goto retry;
	}

	/* Setup bdaddr */
	if (soc_type == QCA_ROME)
		hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
	else
		hu->hdev->set_bdaddr = qca_set_bdaddr;

	if (soc_type == QCA_QCA2066)
		qca_configure_hfp_offload(hdev);

	qca->fw_version = le16_to_cpu(ver.patch_ver);
	qca->controller_id = le16_to_cpu(ver.rom_ver);
	hci_devcd_register(hdev, hci_coredump_qca, qca_dmp_hdr, NULL);

	return ret;
}

static const struct hci_uart_proto qca_proto = {
	.id		= HCI_UART_QCA,
	.name		= "QCA",
	.manufacturer	= 29,
	.init_speed	= 115200,
	.oper_speed	= 3000000,
	.open		= qca_open,
	.close		= qca_close,
	.flush		= qca_flush,
	.setup		= qca_setup,
	.recv		= qca_recv,
	.enqueue	= qca_enqueue,
	.dequeue	= qca_dequeue,
};

static const struct qca_device_data qca_soc_data_wcn3988 __maybe_unused = {
	.soc_type = QCA_WCN3988,
	.vregs = (struct qca_vreg []) {
		{ "vddio", 15000  },
		{ "vddxo", 80000  },
		{ "vddrf", 300000 },
		{ "vddch0", 450000 },
	},
	.num_vregs = 4,
};

static const struct qca_device_data qca_soc_data_wcn3990 __maybe_unused = {
	.soc_type = QCA_WCN3990,
	.vregs = (struct qca_vreg []) {
		{ "vddio", 15000  },
		{ "vddxo", 80000  },
		{ "vddrf", 300000 },
		{ "vddch0", 450000 },
	},
	.num_vregs = 4,
};

static const struct qca_device_data qca_soc_data_wcn3991 __maybe_unused = {
	.soc_type = QCA_WCN3991,
	.vregs = (struct qca_vreg []) {
		{ "vddio", 15000  },
		{ "vddxo", 80000  },
		{ "vddrf", 300000 },
		{ "vddch0", 450000 },
	},
	.num_vregs = 4,
	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
};

static const struct qca_device_data qca_soc_data_wcn3998 __maybe_unused = {
	.soc_type = QCA_WCN3998,
	.vregs = (struct qca_vreg []) {
		{ "vddio", 10000  },
		{ "vddxo", 80000  },
		{ "vddrf", 300000 },
		{ "vddch0", 450000 },
	},
	.num_vregs = 4,
};

static const struct qca_device_data qca_soc_data_qca2066 __maybe_unused = {
	.soc_type = QCA_QCA2066,
	.num_vregs = 0,
	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
};

static const struct qca_device_data qca_soc_data_qca6390 __maybe_unused = {
	.soc_type = QCA_QCA6390,
	.num_vregs = 0,
};

static const struct qca_device_data qca_soc_data_wcn6750 __maybe_unused = {
	.soc_type = QCA_WCN6750,
	.vregs = (struct qca_vreg []) {
		{ "vddio", 5000 },
		{ "vddaon", 26000 },
		{ "vddbtcxmx", 126000 },
		{ "vddrfacmn", 12500 },
		{ "vddrfa0p8", 102000 },
		{ "vddrfa1p7", 302000 },
		{ "vddrfa1p2", 257000 },
		{ "vddrfa2p2", 1700000 },
		{ "vddasd", 200 },
	},
	.num_vregs = 9,
	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
};

static const struct qca_device_data qca_soc_data_wcn6855 __maybe_unused = {
	.soc_type = QCA_WCN6855,
	.vregs = (struct qca_vreg []) {
		{ "vddio", 5000 },
		{ "vddbtcxmx", 126000 },
		{ "vddrfacmn", 12500 },
		{ "vddrfa0p8", 102000 },
		{ "vddrfa1p7", 302000 },
		{ "vddrfa1p2", 257000 },
	},
	.num_vregs = 6,
	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
};

static const struct qca_device_data qca_soc_data_wcn7850 __maybe_unused = {
	.soc_type = QCA_WCN7850,
	.vregs = (struct qca_vreg []) {
		{ "vddio", 5000 },
		{ "vddaon", 26000 },
		{ "vdddig", 126000 },
		{ "vddrfa0p8", 102000 },
		{ "vddrfa1p2", 257000 },
		{ "vddrfa1p9", 302000 },
	},
	.num_vregs = 6,
	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
};

static void qca_power_shutdown(struct hci_uart *hu)
{
	struct qca_serdev *qcadev;
	struct qca_data *qca = hu->priv;
	unsigned long flags;
	enum qca_btsoc_type soc_type = qca_soc_type(hu);
	bool sw_ctrl_state;
	struct qca_power *power;

	/* From this point we go into power off state. But serial port is
	 * still open, stop queueing the IBS data and flush all the buffered
	 * data in skb's.
	 */
	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
	set_bit(QCA_IBS_DISABLED, &qca->flags);
	qca_flush(hu);
	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

	/* Non-serdev device usually is powered by external power
	 * and don't need additional action in driver for power down
	 */
	if (!hu->serdev)
		return;

	qcadev = serdev_device_get_drvdata(hu->serdev);
	power = qcadev->bt_power;

	if (power && power->pwrseq) {
		pwrseq_power_off(power->pwrseq);
		set_bit(QCA_BT_OFF, &qca->flags);
		return;
        }

	switch (soc_type) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
		host_set_baudrate(hu, 2400);
		qca_send_power_pulse(hu, false);
		qca_regulator_disable(qcadev);
		break;

	case QCA_WCN6750:
	case QCA_WCN6855:
		gpiod_set_value_cansleep(qcadev->bt_en, 0);
		msleep(100);
		qca_regulator_disable(qcadev);
		if (qcadev->sw_ctrl) {
			sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
			bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
		}
		break;

	default:
		gpiod_set_value_cansleep(qcadev->bt_en, 0);
	}

	set_bit(QCA_BT_OFF, &qca->flags);
}

static int qca_power_off(struct hci_dev *hdev)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct qca_data *qca = hu->priv;
	enum qca_btsoc_type soc_type = qca_soc_type(hu);

	hu->hdev->hw_error = NULL;
	hu->hdev->cmd_timeout = NULL;

	del_timer_sync(&qca->wake_retrans_timer);
	del_timer_sync(&qca->tx_idle_timer);

	/* Stop sending shutdown command if soc crashes. */
	if (soc_type != QCA_ROME
		&& qca->memdump_state == QCA_MEMDUMP_IDLE) {
		qca_send_pre_shutdown_cmd(hdev);
		usleep_range(8000, 10000);
	}

	qca_power_shutdown(hu);
	return 0;
}

static int qca_regulator_enable(struct qca_serdev *qcadev)
{
	struct qca_power *power = qcadev->bt_power;
	int ret;

	if (power->pwrseq)
		return pwrseq_power_on(power->pwrseq);

	/* Already enabled */
	if (power->vregs_on)
		return 0;

	BT_DBG("enabling %d regulators)", power->num_vregs);

	ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
	if (ret)
		return ret;

	power->vregs_on = true;

	ret = clk_prepare_enable(qcadev->susclk);
	if (ret)
		qca_regulator_disable(qcadev);

	return ret;
}

static void qca_regulator_disable(struct qca_serdev *qcadev)
{
	struct qca_power *power;

	if (!qcadev)
		return;

	power = qcadev->bt_power;

	/* Already disabled? */
	if (!power->vregs_on)
		return;

	regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
	power->vregs_on = false;

	clk_disable_unprepare(qcadev->susclk);
}

static int qca_init_regulators(struct qca_power *qca,
				const struct qca_vreg *vregs, size_t num_vregs)
{
	struct regulator_bulk_data *bulk;
	int ret;
	int i;

	bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
	if (!bulk)
		return -ENOMEM;

	for (i = 0; i < num_vregs; i++)
		bulk[i].supply = vregs[i].name;

	ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
	if (ret < 0)
		return ret;

	for (i = 0; i < num_vregs; i++) {
		ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
		if (ret)
			return ret;
	}

	qca->vreg_bulk = bulk;
	qca->num_vregs = num_vregs;

	return 0;
}

static void qca_clk_disable_unprepare(void *data)
{
	struct clk *clk = data;

	clk_disable_unprepare(clk);
}

static int qca_serdev_probe(struct serdev_device *serdev)
{
	struct qca_serdev *qcadev;
	struct hci_dev *hdev;
	const struct qca_device_data *data;
	int err;
	bool power_ctrl_enabled = true;

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

	qcadev->serdev_hu.serdev = serdev;
	data = device_get_match_data(&serdev->dev);
	serdev_device_set_drvdata(serdev, qcadev);
	device_property_read_string(&serdev->dev, "firmware-name",
					 &qcadev->firmware_name);
	device_property_read_u32(&serdev->dev, "max-speed",
				 &qcadev->oper_speed);
	if (!qcadev->oper_speed)
		BT_DBG("UART will pick default operating speed");

	qcadev->bdaddr_property_broken = device_property_read_bool(&serdev->dev,
			"qcom,local-bd-address-broken");

	if (data)
		qcadev->btsoc_type = data->soc_type;
	else
		qcadev->btsoc_type = QCA_ROME;

	switch (qcadev->btsoc_type) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
	case QCA_WCN6750:
	case QCA_WCN6855:
	case QCA_WCN7850:
	case QCA_QCA6390:
		qcadev->bt_power = devm_kzalloc(&serdev->dev,
						sizeof(struct qca_power),
						GFP_KERNEL);
		if (!qcadev->bt_power)
			return -ENOMEM;
		break;
	default:
		break;
	}

	switch (qcadev->btsoc_type) {
	case QCA_WCN6855:
	case QCA_WCN7850:
		if (!device_property_present(&serdev->dev, "enable-gpios")) {
			/*
			 * Backward compatibility with old DT sources. If the
			 * node doesn't have the 'enable-gpios' property then
			 * let's use the power sequencer. Otherwise, let's
			 * drive everything outselves.
			 */
			qcadev->bt_power->pwrseq = devm_pwrseq_get(&serdev->dev,
								   "bluetooth");
			if (IS_ERR(qcadev->bt_power->pwrseq))
				return PTR_ERR(qcadev->bt_power->pwrseq);

			break;
		}
		fallthrough;
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
	case QCA_WCN6750:
		qcadev->bt_power->dev = &serdev->dev;
		err = qca_init_regulators(qcadev->bt_power, data->vregs,
					  data->num_vregs);
		if (err) {
			BT_ERR("Failed to init regulators:%d", err);
			return err;
		}

		qcadev->bt_power->vregs_on = false;

		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
					       GPIOD_OUT_LOW);
		if (IS_ERR(qcadev->bt_en) &&
		    (data->soc_type == QCA_WCN6750 ||
		     data->soc_type == QCA_WCN6855)) {
			dev_err(&serdev->dev, "failed to acquire BT_EN gpio\n");
			return PTR_ERR(qcadev->bt_en);
		}

		if (!qcadev->bt_en)
			power_ctrl_enabled = false;

		qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
					       GPIOD_IN);
		if (IS_ERR(qcadev->sw_ctrl) &&
		    (data->soc_type == QCA_WCN6750 ||
		     data->soc_type == QCA_WCN6855 ||
		     data->soc_type == QCA_WCN7850)) {
			dev_err(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
			return PTR_ERR(qcadev->sw_ctrl);
		}

		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
		if (IS_ERR(qcadev->susclk)) {
			dev_err(&serdev->dev, "failed to acquire clk\n");
			return PTR_ERR(qcadev->susclk);
		}
		break;

	case QCA_QCA6390:
		if (dev_of_node(&serdev->dev)) {
			qcadev->bt_power->pwrseq = devm_pwrseq_get(&serdev->dev,
								   "bluetooth");
			if (IS_ERR(qcadev->bt_power->pwrseq))
				return PTR_ERR(qcadev->bt_power->pwrseq);
			break;
		}
		fallthrough;

	default:
		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
					       GPIOD_OUT_LOW);
		if (IS_ERR(qcadev->bt_en)) {
			dev_err(&serdev->dev, "failed to acquire enable gpio\n");
			return PTR_ERR(qcadev->bt_en);
		}

		if (!qcadev->bt_en)
			power_ctrl_enabled = false;

		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
		if (IS_ERR(qcadev->susclk)) {
			dev_warn(&serdev->dev, "failed to acquire clk\n");
			return PTR_ERR(qcadev->susclk);
		}
		err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
		if (err)
			return err;

		err = clk_prepare_enable(qcadev->susclk);
		if (err)
			return err;

		err = devm_add_action_or_reset(&serdev->dev,
					       qca_clk_disable_unprepare,
					       qcadev->susclk);
		if (err)
			return err;

	}
	
	err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
	if (err) {
		BT_ERR("serdev registration failed");
		return err;
	}

	hdev = qcadev->serdev_hu.hdev;

	if (power_ctrl_enabled) {
		set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
		hdev->shutdown = qca_power_off;
	}

	if (data) {
		/* Wideband speech support must be set per driver since it can't
		 * be queried via hci. Same with the valid le states quirk.
		 */
		if (data->capabilities & QCA_CAP_WIDEBAND_SPEECH)
			set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED,
				&hdev->quirks);

		if (data->capabilities & QCA_CAP_VALID_LE_STATES)
			set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
	}

	return 0;
}

static void qca_serdev_remove(struct serdev_device *serdev)
{
	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
	struct qca_power *power = qcadev->bt_power;

	switch (qcadev->btsoc_type) {
	case QCA_WCN3988:
	case QCA_WCN3990:
	case QCA_WCN3991:
	case QCA_WCN3998:
	case QCA_WCN6750:
	case QCA_WCN6855:
	case QCA_WCN7850:
		if (power->vregs_on)
			qca_power_shutdown(&qcadev->serdev_hu);
		break;
	default:
		break;
	}

	hci_uart_unregister_device(&qcadev->serdev_hu);
}

static void qca_serdev_shutdown(struct device *dev)
{
	int ret;
	int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
	struct serdev_device *serdev = to_serdev_device(dev);
	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
	struct hci_uart *hu = &qcadev->serdev_hu;
	struct hci_dev *hdev = hu->hdev;
	const u8 ibs_wake_cmd[] = { 0xFD };
	const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 };

	if (qcadev->btsoc_type == QCA_QCA6390) {
		/* The purpose of sending the VSC is to reset SOC into a initial
		 * state and the state will ensure next hdev->setup() success.
		 * if HCI_QUIRK_NON_PERSISTENT_SETUP is set, it means that
		 * hdev->setup() can do its job regardless of SoC state, so
		 * don't need to send the VSC.
		 * if HCI_SETUP is set, it means that hdev->setup() was never
		 * invoked and the SOC is already in the initial state, so
		 * don't also need to send the VSC.
		 */
		if (test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks) ||
		    hci_dev_test_flag(hdev, HCI_SETUP))
			return;

		/* The serdev must be in open state when conrol logic arrives
		 * here, so also fix the use-after-free issue caused by that
		 * the serdev is flushed or wrote after it is closed.
		 */
		serdev_device_write_flush(serdev);
		ret = serdev_device_write_buf(serdev, ibs_wake_cmd,
					      sizeof(ibs_wake_cmd));
		if (ret < 0) {
			BT_ERR("QCA send IBS_WAKE_IND error: %d", ret);
			return;
		}
		serdev_device_wait_until_sent(serdev, timeout);
		usleep_range(8000, 10000);

		serdev_device_write_flush(serdev);
		ret = serdev_device_write_buf(serdev, edl_reset_soc_cmd,
					      sizeof(edl_reset_soc_cmd));
		if (ret < 0) {
			BT_ERR("QCA send EDL_RESET_REQ error: %d", ret);
			return;
		}
		serdev_device_wait_until_sent(serdev, timeout);
		usleep_range(8000, 10000);
	}
}

static int __maybe_unused qca_suspend(struct device *dev)
{
	struct serdev_device *serdev = to_serdev_device(dev);
	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
	struct hci_uart *hu = &qcadev->serdev_hu;
	struct qca_data *qca = hu->priv;
	unsigned long flags;
	bool tx_pending = false;
	int ret = 0;
	u8 cmd;
	u32 wait_timeout = 0;

	set_bit(QCA_SUSPENDING, &qca->flags);

	/* if BT SoC is running with default firmware then it does not
	 * support in-band sleep
	 */
	if (test_bit(QCA_ROM_FW, &qca->flags))
		return 0;

	/* During SSR after memory dump collection, controller will be
	 * powered off and then powered on.If controller is powered off
	 * during SSR then we should wait until SSR is completed.
	 */
	if (test_bit(QCA_BT_OFF, &qca->flags) &&
	    !test_bit(QCA_SSR_TRIGGERED, &qca->flags))
		return 0;

	if (test_bit(QCA_IBS_DISABLED, &qca->flags) ||
	    test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
		wait_timeout = test_bit(QCA_SSR_TRIGGERED, &qca->flags) ?
					IBS_DISABLE_SSR_TIMEOUT_MS :
					FW_DOWNLOAD_TIMEOUT_MS;

		/* QCA_IBS_DISABLED flag is set to true, During FW download
		 * and during memory dump collection. It is reset to false,
		 * After FW download complete.
		 */
		wait_on_bit_timeout(&qca->flags, QCA_IBS_DISABLED,
			    TASK_UNINTERRUPTIBLE, msecs_to_jiffies(wait_timeout));

		if (test_bit(QCA_IBS_DISABLED, &qca->flags)) {
			bt_dev_err(hu->hdev, "SSR or FW download time out");
			ret = -ETIMEDOUT;
			goto error;
		}
	}

	cancel_work_sync(&qca->ws_awake_device);
	cancel_work_sync(&qca->ws_awake_rx);

	spin_lock_irqsave_nested(&qca->hci_ibs_lock,
				 flags, SINGLE_DEPTH_NESTING);

	switch (qca->tx_ibs_state) {
	case HCI_IBS_TX_WAKING:
		del_timer(&qca->wake_retrans_timer);
		fallthrough;
	case HCI_IBS_TX_AWAKE:
		del_timer(&qca->tx_idle_timer);

		serdev_device_write_flush(hu->serdev);
		cmd = HCI_IBS_SLEEP_IND;
		ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));

		if (ret < 0) {
			BT_ERR("Failed to send SLEEP to device");
			break;
		}

		qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
		qca->ibs_sent_slps++;
		tx_pending = true;
		break;

	case HCI_IBS_TX_ASLEEP:
		break;

	default:
		BT_ERR("Spurious tx state %d", qca->tx_ibs_state);
		ret = -EINVAL;
		break;
	}

	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

	if (ret < 0)
		goto error;

	if (tx_pending) {
		serdev_device_wait_until_sent(hu->serdev,
					      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
		serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
	}

	/* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going
	 * to sleep, so that the packet does not wake the system later.
	 */
	ret = wait_event_interruptible_timeout(qca->suspend_wait_q,
			qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
			msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
	if (ret == 0) {
		ret = -ETIMEDOUT;
		goto error;
	}

	return 0;

error:
	clear_bit(QCA_SUSPENDING, &qca->flags);

	return ret;
}

static int __maybe_unused qca_resume(struct device *dev)
{
	struct serdev_device *serdev = to_serdev_device(dev);
	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
	struct hci_uart *hu = &qcadev->serdev_hu;
	struct qca_data *qca = hu->priv;

	clear_bit(QCA_SUSPENDING, &qca->flags);

	return 0;
}

static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume);

#ifdef CONFIG_OF
static const struct of_device_id qca_bluetooth_of_match[] = {
	{ .compatible = "qcom,qca2066-bt", .data = &qca_soc_data_qca2066},
	{ .compatible = "qcom,qca6174-bt" },
	{ .compatible = "qcom,qca6390-bt", .data = &qca_soc_data_qca6390},
	{ .compatible = "qcom,qca9377-bt" },
	{ .compatible = "qcom,wcn3988-bt", .data = &qca_soc_data_wcn3988},
	{ .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
	{ .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
	{ .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
	{ .compatible = "qcom,wcn6750-bt", .data = &qca_soc_data_wcn6750},
	{ .compatible = "qcom,wcn6855-bt", .data = &qca_soc_data_wcn6855},
	{ .compatible = "qcom,wcn7850-bt", .data = &qca_soc_data_wcn7850},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id qca_bluetooth_acpi_match[] = {
	{ "QCOM2066", (kernel_ulong_t)&qca_soc_data_qca2066 },
	{ "QCOM6390", (kernel_ulong_t)&qca_soc_data_qca6390 },
	{ "DLA16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
	{ "DLB16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
	{ "DLB26390", (kernel_ulong_t)&qca_soc_data_qca6390 },
	{ },
};
MODULE_DEVICE_TABLE(acpi, qca_bluetooth_acpi_match);
#endif

#ifdef CONFIG_DEV_COREDUMP
static void hciqca_coredump(struct device *dev)
{
	struct serdev_device *serdev = to_serdev_device(dev);
	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
	struct hci_uart *hu = &qcadev->serdev_hu;
	struct hci_dev  *hdev = hu->hdev;

	if (hdev->dump.coredump)
		hdev->dump.coredump(hdev);
}
#endif

static struct serdev_device_driver qca_serdev_driver = {
	.probe = qca_serdev_probe,
	.remove = qca_serdev_remove,
	.driver = {
		.name = "hci_uart_qca",
		.of_match_table = of_match_ptr(qca_bluetooth_of_match),
		.acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
		.shutdown = qca_serdev_shutdown,
		.pm = &qca_pm_ops,
#ifdef CONFIG_DEV_COREDUMP
		.coredump = hciqca_coredump,
#endif
	},
};

int __init qca_init(void)
{
	serdev_device_driver_register(&qca_serdev_driver);

	return hci_uart_register_proto(&qca_proto);
}

int __exit qca_deinit(void)
{
	serdev_device_driver_unregister(&qca_serdev_driver);

	return hci_uart_unregister_proto(&qca_proto);
}