forked from Thundzz/bluetooth-5.13
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathbtmtkuart.c
1135 lines (924 loc) · 26.4 KB
/
btmtkuart.c
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
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 MediaTek Inc.
/*
* Bluetooth support for MediaTek serial devices
*
* Author: Sean Wang <[email protected]>
*
*/
#include <asm/unaligned.h>
#include <linux/atomic.h>
#include <linux/clk.h>
#include <linux/firmware.h>
#include <linux/gpio/consumer.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/serdev.h>
#include <linux/skbuff.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "h4_recv.h"
#define VERSION "0.2"
#define FIRMWARE_MT7622 "mediatek/mt7622pr2h.bin"
#define FIRMWARE_MT7663 "mediatek/mt7663pr2h.bin"
#define FIRMWARE_MT7668 "mediatek/mt7668pr2h.bin"
#define MTK_STP_TLR_SIZE 2
#define BTMTKUART_TX_STATE_ACTIVE 1
#define BTMTKUART_TX_STATE_WAKEUP 2
#define BTMTKUART_TX_WAIT_VND_EVT 3
#define BTMTKUART_REQUIRED_WAKEUP 4
#define BTMTKUART_FLAG_STANDALONE_HW BIT(0)
enum {
MTK_WMT_PATCH_DWNLD = 0x1,
MTK_WMT_TEST = 0x2,
MTK_WMT_WAKEUP = 0x3,
MTK_WMT_HIF = 0x4,
MTK_WMT_FUNC_CTRL = 0x6,
MTK_WMT_RST = 0x7,
MTK_WMT_SEMAPHORE = 0x17,
};
enum {
BTMTK_WMT_INVALID,
BTMTK_WMT_PATCH_UNDONE,
BTMTK_WMT_PATCH_DONE,
BTMTK_WMT_ON_UNDONE,
BTMTK_WMT_ON_DONE,
BTMTK_WMT_ON_PROGRESS,
};
struct mtk_stp_hdr {
u8 prefix;
__be16 dlen;
u8 cs;
} __packed;
struct btmtkuart_data {
unsigned int flags;
const char *fwname;
};
struct mtk_wmt_hdr {
u8 dir;
u8 op;
__le16 dlen;
u8 flag;
} __packed;
struct mtk_hci_wmt_cmd {
struct mtk_wmt_hdr hdr;
u8 data[256];
} __packed;
struct btmtk_hci_wmt_evt {
struct hci_event_hdr hhdr;
struct mtk_wmt_hdr whdr;
} __packed;
struct btmtk_hci_wmt_evt_funcc {
struct btmtk_hci_wmt_evt hwhdr;
__be16 status;
} __packed;
struct btmtk_tci_sleep {
u8 mode;
__le16 duration;
__le16 host_duration;
u8 host_wakeup_pin;
u8 time_compensation;
} __packed;
struct btmtk_hci_wmt_params {
u8 op;
u8 flag;
u16 dlen;
const void *data;
u32 *status;
};
struct btmtkuart_dev {
struct hci_dev *hdev;
struct serdev_device *serdev;
struct clk *clk;
struct clk *osc;
struct regulator *vcc;
struct gpio_desc *reset;
struct gpio_desc *boot;
struct pinctrl *pinctrl;
struct pinctrl_state *pins_runtime;
struct pinctrl_state *pins_boot;
speed_t desired_speed;
speed_t curr_speed;
struct work_struct tx_work;
unsigned long tx_state;
struct sk_buff_head txq;
struct sk_buff *rx_skb;
struct sk_buff *evt_skb;
u8 stp_pad[6];
u8 stp_cursor;
u16 stp_dlen;
const struct btmtkuart_data *data;
};
#define btmtkuart_is_standalone(bdev) \
((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
#define btmtkuart_is_builtin_soc(bdev) \
!((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
static int mtk_hci_wmt_sync(struct hci_dev *hdev,
struct btmtk_hci_wmt_params *wmt_params)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
u32 hlen, status = BTMTK_WMT_INVALID;
struct btmtk_hci_wmt_evt *wmt_evt;
struct mtk_hci_wmt_cmd wc;
struct mtk_wmt_hdr *hdr;
int err;
hlen = sizeof(*hdr) + wmt_params->dlen;
if (hlen > 255)
return -EINVAL;
hdr = (struct mtk_wmt_hdr *)&wc;
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(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
err = __hci_cmd_send(hdev, 0xfc6f, hlen, &wc);
if (err < 0) {
clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
return err;
}
/* 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 BTMTKUART_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, BTMTKUART_TX_WAIT_VND_EVT,
TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
if (err == -EINTR) {
bt_dev_err(hdev, "Execution of wmt command interrupted");
clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
return err;
}
if (err) {
bt_dev_err(hdev, "Execution of wmt command timed out");
clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
return -ETIMEDOUT;
}
/* 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 MTK_WMT_SEMAPHORE:
if (wmt_evt->whdr.flag == 2)
status = BTMTK_WMT_PATCH_UNDONE;
else
status = BTMTK_WMT_PATCH_DONE;
break;
case MTK_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;
}
if (wmt_params->status)
*wmt_params->status = status;
err_free_skb:
kfree_skb(bdev->evt_skb);
bdev->evt_skb = NULL;
return err;
}
static int mtk_setup_firmware(struct hci_dev *hdev, const char *fwname)
{
struct btmtk_hci_wmt_params wmt_params;
const struct firmware *fw;
const u8 *fw_ptr;
size_t fw_size;
int err, dlen;
u8 flag;
err = request_firmware(&fw, fwname, &hdev->dev);
if (err < 0) {
bt_dev_err(hdev, "Failed to load firmware file (%d)", err);
return err;
}
fw_ptr = fw->data;
fw_size = fw->size;
/* The size of patch header is 30 bytes, should be skip */
if (fw_size < 30) {
err = -EINVAL;
goto free_fw;
}
fw_size -= 30;
fw_ptr += 30;
flag = 1;
wmt_params.op = MTK_WMT_PATCH_DWNLD;
wmt_params.status = NULL;
while (fw_size > 0) {
dlen = min_t(int, 250, fw_size);
/* Tell device the position in sequence */
if (fw_size - dlen <= 0)
flag = 3;
else if (fw_size < fw->size - 30)
flag = 2;
wmt_params.flag = flag;
wmt_params.dlen = dlen;
wmt_params.data = fw_ptr;
err = mtk_hci_wmt_sync(hdev, &wmt_params);
if (err < 0) {
bt_dev_err(hdev, "Failed to send wmt patch dwnld (%d)",
err);
goto free_fw;
}
fw_size -= dlen;
fw_ptr += dlen;
}
wmt_params.op = MTK_WMT_RST;
wmt_params.flag = 4;
wmt_params.dlen = 0;
wmt_params.data = NULL;
wmt_params.status = NULL;
/* Activate funciton the firmware providing to */
err = mtk_hci_wmt_sync(hdev, &wmt_params);
if (err < 0) {
bt_dev_err(hdev, "Failed to send wmt rst (%d)", err);
goto free_fw;
}
/* Wait a few moments for firmware activation done */
usleep_range(10000, 12000);
free_fw:
release_firmware(fw);
return err;
}
static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
struct hci_event_hdr *hdr = (void *)skb->data;
int err;
/* Fix up the vendor event id with 0xff for vendor specific instead
* of 0xe4 so that event send via monitoring socket can be parsed
* properly.
*/
if (hdr->evt == 0xe4)
hdr->evt = HCI_EV_VENDOR;
/* When someone waits for the WMT event, the skb is being cloned
* and being processed the events from there then.
*/
if (test_bit(BTMTKUART_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 (hdr->evt == HCI_EV_VENDOR) {
if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT,
&bdev->tx_state)) {
/* Barrier to sync with other CPUs */
smp_mb__after_atomic();
wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT);
}
}
return 0;
err_free_skb:
kfree_skb(bdev->evt_skb);
bdev->evt_skb = NULL;
err_out:
return err;
}
static const struct h4_recv_pkt mtk_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = btmtkuart_recv_event },
};
static void btmtkuart_tx_work(struct work_struct *work)
{
struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev,
tx_work);
struct serdev_device *serdev = bdev->serdev;
struct hci_dev *hdev = bdev->hdev;
while (1) {
clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
while (1) {
struct sk_buff *skb = skb_dequeue(&bdev->txq);
int len;
if (!skb)
break;
len = serdev_device_write_buf(serdev, skb->data,
skb->len);
hdev->stat.byte_tx += len;
skb_pull(skb, len);
if (skb->len > 0) {
skb_queue_head(&bdev->txq, skb);
break;
}
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;
}
kfree_skb(skb);
}
if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state))
break;
}
clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state);
}
static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev)
{
if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state))
set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
schedule_work(&bdev->tx_work);
}
static const unsigned char *
mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count,
int *sz_h4)
{
struct mtk_stp_hdr *shdr;
/* The cursor is reset when all the data of STP is consumed out */
if (!bdev->stp_dlen && bdev->stp_cursor >= 6)
bdev->stp_cursor = 0;
/* Filling pad until all STP info is obtained */
while (bdev->stp_cursor < 6 && count > 0) {
bdev->stp_pad[bdev->stp_cursor] = *data;
bdev->stp_cursor++;
data++;
count--;
}
/* Retrieve STP info and have a sanity check */
if (!bdev->stp_dlen && bdev->stp_cursor >= 6) {
shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2];
bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff;
/* Resync STP when unexpected data is being read */
if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) {
bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)",
shdr->prefix, bdev->stp_dlen);
bdev->stp_cursor = 2;
bdev->stp_dlen = 0;
}
}
/* Directly quit when there's no data found for H4 can process */
if (count <= 0)
return NULL;
/* Tranlate to how much the size of data H4 can handle so far */
*sz_h4 = min_t(int, count, bdev->stp_dlen);
/* Update the remaining size of STP packet */
bdev->stp_dlen -= *sz_h4;
/* Data points to STP payload which can be handled by H4 */
return data;
}
static int btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
const unsigned char *p_left = data, *p_h4;
int sz_left = count, sz_h4, adv;
int err;
while (sz_left > 0) {
/* The serial data received from MT7622 BT controller is
* at all time padded around with the STP header and tailer.
*
* A full STP packet is looking like
* -----------------------------------
* | STP header | H:4 | STP tailer |
* -----------------------------------
* but it doesn't guarantee to contain a full H:4 packet which
* means that it's possible for multiple STP packets forms a
* full H:4 packet that means extra STP header + length doesn't
* indicate a full H:4 frame, things can fragment. Whose length
* recorded in STP header just shows up the most length the
* H:4 engine can handle currently.
*/
p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4);
if (!p_h4)
break;
adv = p_h4 - p_left;
sz_left -= adv;
p_left += adv;
bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4,
sz_h4, mtk_recv_pkts,
ARRAY_SIZE(mtk_recv_pkts));
if (IS_ERR(bdev->rx_skb)) {
err = PTR_ERR(bdev->rx_skb);
bt_dev_err(bdev->hdev,
"Frame reassembly failed (%d)", err);
bdev->rx_skb = NULL;
return err;
}
sz_left -= sz_h4;
p_left += sz_h4;
}
return 0;
}
static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data,
size_t count)
{
struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
int err;
err = btmtkuart_recv(bdev->hdev, data, count);
if (err < 0)
return err;
bdev->hdev->stat.byte_rx += count;
return count;
}
static void btmtkuart_write_wakeup(struct serdev_device *serdev)
{
struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
btmtkuart_tx_wakeup(bdev);
}
static const struct serdev_device_ops btmtkuart_client_ops = {
.receive_buf = btmtkuart_receive_buf,
.write_wakeup = btmtkuart_write_wakeup,
};
static int btmtkuart_open(struct hci_dev *hdev)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
struct device *dev;
int err;
err = serdev_device_open(bdev->serdev);
if (err) {
bt_dev_err(hdev, "Unable to open UART device %s",
dev_name(&bdev->serdev->dev));
goto err_open;
}
if (btmtkuart_is_standalone(bdev)) {
if (bdev->curr_speed != bdev->desired_speed)
err = serdev_device_set_baudrate(bdev->serdev,
115200);
else
err = serdev_device_set_baudrate(bdev->serdev,
bdev->desired_speed);
if (err < 0) {
bt_dev_err(hdev, "Unable to set baudrate UART device %s",
dev_name(&bdev->serdev->dev));
goto err_serdev_close;
}
serdev_device_set_flow_control(bdev->serdev, false);
}
bdev->stp_cursor = 2;
bdev->stp_dlen = 0;
dev = &bdev->serdev->dev;
/* Enable the power domain and clock the device requires */
pm_runtime_enable(dev);
err = pm_runtime_get_sync(dev);
if (err < 0) {
pm_runtime_put_noidle(dev);
goto err_disable_rpm;
}
err = clk_prepare_enable(bdev->clk);
if (err < 0)
goto err_put_rpm;
return 0;
err_put_rpm:
pm_runtime_put_sync(dev);
err_disable_rpm:
pm_runtime_disable(dev);
err_serdev_close:
serdev_device_close(bdev->serdev);
err_open:
return err;
}
static int btmtkuart_close(struct hci_dev *hdev)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
struct device *dev = &bdev->serdev->dev;
/* Shutdown the clock and power domain the device requires */
clk_disable_unprepare(bdev->clk);
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
serdev_device_close(bdev->serdev);
return 0;
}
static int btmtkuart_flush(struct hci_dev *hdev)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
/* Flush any pending characters */
serdev_device_write_flush(bdev->serdev);
skb_queue_purge(&bdev->txq);
cancel_work_sync(&bdev->tx_work);
kfree_skb(bdev->rx_skb);
bdev->rx_skb = NULL;
bdev->stp_cursor = 2;
bdev->stp_dlen = 0;
return 0;
}
static int btmtkuart_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 = MTK_WMT_FUNC_CTRL;
wmt_params.flag = 4;
wmt_params.dlen = sizeof(param);
wmt_params.data = ¶m;
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 btmtkuart_change_baudrate(struct hci_dev *hdev)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
struct btmtk_hci_wmt_params wmt_params;
__le32 baudrate;
u8 param;
int err;
/* Indicate the device to enter the probe state the host is
* ready to change a new baudrate.
*/
baudrate = cpu_to_le32(bdev->desired_speed);
wmt_params.op = MTK_WMT_HIF;
wmt_params.flag = 1;
wmt_params.dlen = 4;
wmt_params.data = &baudrate;
wmt_params.status = NULL;
err = mtk_hci_wmt_sync(hdev, &wmt_params);
if (err < 0) {
bt_dev_err(hdev, "Failed to device baudrate (%d)", err);
return err;
}
err = serdev_device_set_baudrate(bdev->serdev,
bdev->desired_speed);
if (err < 0) {
bt_dev_err(hdev, "Failed to set up host baudrate (%d)",
err);
return err;
}
serdev_device_set_flow_control(bdev->serdev, false);
/* Send a dummy byte 0xff to activate the new baudrate */
param = 0xff;
err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param));
if (err < 0 || err < sizeof(param))
return err;
serdev_device_wait_until_sent(bdev->serdev, 0);
/* Wait some time for the device changing baudrate done */
usleep_range(20000, 22000);
/* Test the new baudrate */
wmt_params.op = MTK_WMT_TEST;
wmt_params.flag = 7;
wmt_params.dlen = 0;
wmt_params.data = NULL;
wmt_params.status = NULL;
err = mtk_hci_wmt_sync(hdev, &wmt_params);
if (err < 0) {
bt_dev_err(hdev, "Failed to test new baudrate (%d)",
err);
return err;
}
bdev->curr_speed = bdev->desired_speed;
return 0;
}
static int btmtkuart_setup(struct hci_dev *hdev)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
struct btmtk_hci_wmt_params wmt_params;
ktime_t calltime, delta, rettime;
struct btmtk_tci_sleep tci_sleep;
unsigned long long duration;
struct sk_buff *skb;
int err, status;
u8 param = 0x1;
calltime = ktime_get();
/* Wakeup MCUSYS is required for certain devices before we start to
* do any setups.
*/
if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) {
wmt_params.op = MTK_WMT_WAKEUP;
wmt_params.flag = 3;
wmt_params.dlen = 0;
wmt_params.data = NULL;
wmt_params.status = NULL;
err = mtk_hci_wmt_sync(hdev, &wmt_params);
if (err < 0) {
bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err);
return err;
}
clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
}
if (btmtkuart_is_standalone(bdev))
btmtkuart_change_baudrate(hdev);
/* Query whether the firmware is already download */
wmt_params.op = MTK_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 = mtk_setup_firmware(hdev, bdev->data->fwname);
if (err < 0)
return err;
ignore_setup_fw:
/* Query whether the device is already enabled */
err = readx_poll_timeout(btmtkuart_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 = MTK_WMT_FUNC_CTRL;
wmt_params.flag = 0;
wmt_params.dlen = sizeof(param);
wmt_params.data = ¶m;
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;
}
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);
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
duration = (unsigned long long)ktime_to_ns(delta) >> 10;
bt_dev_info(hdev, "Device setup in %llu usecs", duration);
return 0;
}
static int btmtkuart_shutdown(struct hci_dev *hdev)
{
struct btmtk_hci_wmt_params wmt_params;
u8 param = 0x0;
int err;
/* Disable the device */
wmt_params.op = MTK_WMT_FUNC_CTRL;
wmt_params.flag = 0;
wmt_params.dlen = sizeof(param);
wmt_params.data = ¶m;
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;
}
return 0;
}
static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
{
struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
struct mtk_stp_hdr *shdr;
int err, dlen, type = 0;
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
/* Make sure that there is enough rooms for STP header and trailer */
if (unlikely(skb_headroom(skb) < sizeof(*shdr)) ||
(skb_tailroom(skb) < MTK_STP_TLR_SIZE)) {
err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE,
GFP_ATOMIC);
if (err < 0)
return err;
}
/* Add the STP header */
dlen = skb->len;
shdr = skb_push(skb, sizeof(*shdr));
shdr->prefix = 0x80;
shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12));
shdr->cs = 0; /* MT7622 doesn't care about checksum value */
/* Add the STP trailer */
skb_put_zero(skb, MTK_STP_TLR_SIZE);
skb_queue_tail(&bdev->txq, skb);
btmtkuart_tx_wakeup(bdev);
return 0;
}
static int btmtkuart_parse_dt(struct serdev_device *serdev)
{
struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
struct device_node *node = serdev->dev.of_node;
u32 speed = 921600;
int err;
if (btmtkuart_is_standalone(bdev)) {
of_property_read_u32(node, "current-speed", &speed);
bdev->desired_speed = speed;
bdev->vcc = devm_regulator_get(&serdev->dev, "vcc");
if (IS_ERR(bdev->vcc)) {
err = PTR_ERR(bdev->vcc);
return err;
}
bdev->osc = devm_clk_get_optional(&serdev->dev, "osc");
if (IS_ERR(bdev->osc)) {
err = PTR_ERR(bdev->osc);
return err;
}
bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot",
GPIOD_OUT_LOW);
if (IS_ERR(bdev->boot)) {
err = PTR_ERR(bdev->boot);
return err;
}
bdev->pinctrl = devm_pinctrl_get(&serdev->dev);
if (IS_ERR(bdev->pinctrl)) {
err = PTR_ERR(bdev->pinctrl);
return err;
}
bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl,
"default");
if (IS_ERR(bdev->pins_boot) && !bdev->boot) {
err = PTR_ERR(bdev->pins_boot);
dev_err(&serdev->dev,
"Should assign RXD to LOW at boot stage\n");
return err;
}
bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl,
"runtime");
if (IS_ERR(bdev->pins_runtime)) {
err = PTR_ERR(bdev->pins_runtime);
return err;
}
bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(bdev->reset)) {
err = PTR_ERR(bdev->reset);
return err;
}
} else if (btmtkuart_is_builtin_soc(bdev)) {
bdev->clk = devm_clk_get(&serdev->dev, "ref");
if (IS_ERR(bdev->clk))
return PTR_ERR(bdev->clk);
}
return 0;
}
static int btmtkuart_probe(struct serdev_device *serdev)
{
struct btmtkuart_dev *bdev;
struct hci_dev *hdev;
int err;
bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL);
if (!bdev)
return -ENOMEM;
bdev->data = of_device_get_match_data(&serdev->dev);
if (!bdev->data)
return -ENODEV;
bdev->serdev = serdev;
serdev_device_set_drvdata(serdev, bdev);
serdev_device_set_client_ops(serdev, &btmtkuart_client_ops);
err = btmtkuart_parse_dt(serdev);
if (err < 0)
return err;
INIT_WORK(&bdev->tx_work, btmtkuart_tx_work);
skb_queue_head_init(&bdev->txq);
/* Initialize and register HCI device */
hdev = hci_alloc_dev();
if (!hdev) {
dev_err(&serdev->dev, "Can't allocate HCI device\n");
return -ENOMEM;
}
bdev->hdev = hdev;
hdev->bus = HCI_UART;