summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/ath/ath11k/htc.c
blob: 9d4115f25ceb4d034d10e4ee03cd28005ba0ffe3 (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
// SPDX-License-Identifier: BSD-3-Clause-Clear
/*
 * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
 */
#include <linux/skbuff.h>
#include <linux/ctype.h>

#include "ahb.h"
#include "debug.h"

struct sk_buff *ath11k_htc_alloc_skb(struct ath11k_base *ab, int size)
{
	struct sk_buff *skb;

	skb = dev_alloc_skb(size + sizeof(struct ath11k_htc_hdr));
	if (!skb)
		return NULL;

	skb_reserve(skb, sizeof(struct ath11k_htc_hdr));

	/* FW/HTC requires 4-byte aligned streams */
	if (!IS_ALIGNED((unsigned long)skb->data, 4))
		ath11k_warn(ab, "Unaligned HTC tx skb\n");

	return skb;
}

static void ath11k_htc_control_tx_complete(struct ath11k_base *ab,
					   struct sk_buff *skb)
{
	kfree_skb(skb);
}

static struct sk_buff *ath11k_htc_build_tx_ctrl_skb(void *ab)
{
	struct sk_buff *skb;
	struct ath11k_skb_cb *skb_cb;

	skb = dev_alloc_skb(ATH11K_HTC_CONTROL_BUFFER_SIZE);
	if (!skb)
		return NULL;

	skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
	WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4));

	skb_cb = ATH11K_SKB_CB(skb);
	memset(skb_cb, 0, sizeof(*skb_cb));

	ath11k_dbg(ab, ATH11K_DBG_HTC, "%s: skb %pK\n", __func__, skb);
	return skb;
}

static inline void ath11k_htc_restore_tx_skb(struct ath11k_htc *htc,
					     struct sk_buff *skb)
{
	struct ath11k_skb_cb *skb_cb = ATH11K_SKB_CB(skb);

	dma_unmap_single(htc->ab->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
	skb_pull(skb, sizeof(struct ath11k_htc_hdr));
}

static void ath11k_htc_prepare_tx_skb(struct ath11k_htc_ep *ep,
				      struct sk_buff *skb)
{
	struct ath11k_htc_hdr *hdr;

	hdr = (struct ath11k_htc_hdr *)skb->data;

	memset(hdr, 0, sizeof(*hdr));
	hdr->htc_info = FIELD_PREP(HTC_HDR_ENDPOINTID, ep->eid) |
			FIELD_PREP(HTC_HDR_PAYLOADLEN,
				   (skb->len - sizeof(*hdr))) |
			FIELD_PREP(HTC_HDR_FLAGS,
				   ATH11K_HTC_FLAG_NEED_CREDIT_UPDATE);

	spin_lock_bh(&ep->htc->tx_lock);
	hdr->ctrl_info = FIELD_PREP(HTC_HDR_CONTROLBYTES1, ep->seq_no++);
	spin_unlock_bh(&ep->htc->tx_lock);
}

int ath11k_htc_send(struct ath11k_htc *htc,
		    enum ath11k_htc_ep_id eid,
		    struct sk_buff *skb)
{
	struct ath11k_htc_ep *ep = &htc->endpoint[eid];
	struct ath11k_skb_cb *skb_cb = ATH11K_SKB_CB(skb);
	struct device *dev = htc->ab->dev;
	struct ath11k_base *ab = htc->ab;
	int credits = 0;
	int ret;

	if (eid >= ATH11K_HTC_EP_COUNT) {
		ath11k_warn(ab, "Invalid endpoint id: %d\n", eid);
		return -ENOENT;
	}

	skb_push(skb, sizeof(struct ath11k_htc_hdr));

	if (ep->tx_credit_flow_enabled) {
		credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
		spin_lock_bh(&htc->tx_lock);
		if (ep->tx_credits < credits) {
			ath11k_dbg(ab, ATH11K_DBG_HTC,
				   "htc insufficient credits ep %d required %d available %d\n",
				   eid, credits, ep->tx_credits);
			spin_unlock_bh(&htc->tx_lock);
			ret = -EAGAIN;
			goto err_pull;
		}
		ep->tx_credits -= credits;
		ath11k_dbg(ab, ATH11K_DBG_HTC,
			   "htc ep %d consumed %d credits (total %d)\n",
			   eid, credits, ep->tx_credits);
		spin_unlock_bh(&htc->tx_lock);
	}

	ath11k_htc_prepare_tx_skb(ep, skb);

	skb_cb->eid = eid;
	skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
	ret = dma_mapping_error(dev, skb_cb->paddr);
	if (ret) {
		ret = -EIO;
		goto err_credits;
	}

	ret = ath11k_ce_send(htc->ab, skb, ep->ul_pipe_id, ep->eid);
	if (ret)
		goto err_unmap;

	return 0;

err_unmap:
	dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
err_credits:
	if (ep->tx_credit_flow_enabled) {
		spin_lock_bh(&htc->tx_lock);
		ep->tx_credits += credits;
		ath11k_dbg(ab, ATH11K_DBG_HTC,
			   "htc ep %d reverted %d credits back (total %d)\n",
			   eid, credits, ep->tx_credits);
		spin_unlock_bh(&htc->tx_lock);

		if (ep->ep_ops.ep_tx_credits)
			ep->ep_ops.ep_tx_credits(htc->ab);
	}
err_pull:
	skb_pull(skb, sizeof(struct ath11k_htc_hdr));
	return ret;
}

static void
ath11k_htc_process_credit_report(struct ath11k_htc *htc,
				 const struct ath11k_htc_credit_report *report,
				 int len,
				 enum ath11k_htc_ep_id eid)
{
	struct ath11k_base *ab = htc->ab;
	struct ath11k_htc_ep *ep;
	int i, n_reports;

	if (len % sizeof(*report))
		ath11k_warn(ab, "Uneven credit report len %d", len);

	n_reports = len / sizeof(*report);

	spin_lock_bh(&htc->tx_lock);
	for (i = 0; i < n_reports; i++, report++) {
		if (report->eid >= ATH11K_HTC_EP_COUNT)
			break;

		ep = &htc->endpoint[report->eid];
		ep->tx_credits += report->credits;

		ath11k_dbg(ab, ATH11K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",
			   report->eid, report->credits, ep->tx_credits);

		if (ep->ep_ops.ep_tx_credits) {
			spin_unlock_bh(&htc->tx_lock);
			ep->ep_ops.ep_tx_credits(htc->ab);
			spin_lock_bh(&htc->tx_lock);
		}
	}
	spin_unlock_bh(&htc->tx_lock);
}

static int ath11k_htc_process_trailer(struct ath11k_htc *htc,
				      u8 *buffer,
				      int length,
				      enum ath11k_htc_ep_id src_eid)
{
	struct ath11k_base *ab = htc->ab;
	int status = 0;
	struct ath11k_htc_record *record;
	size_t len;

	while (length > 0) {
		record = (struct ath11k_htc_record *)buffer;

		if (length < sizeof(record->hdr)) {
			status = -EINVAL;
			break;
		}

		if (record->hdr.len > length) {
			/* no room left in buffer for record */
			ath11k_warn(ab, "Invalid record length: %d\n",
				    record->hdr.len);
			status = -EINVAL;
			break;
		}

		switch (record->hdr.id) {
		case ATH11K_HTC_RECORD_CREDITS:
			len = sizeof(struct ath11k_htc_credit_report);
			if (record->hdr.len < len) {
				ath11k_warn(ab, "Credit report too long\n");
				status = -EINVAL;
				break;
			}
			ath11k_htc_process_credit_report(htc,
							 record->credit_report,
							 record->hdr.len,
							 src_eid);
			break;
		default:
			ath11k_warn(ab, "Unhandled record: id:%d length:%d\n",
				    record->hdr.id, record->hdr.len);
			break;
		}

		if (status)
			break;

		/* multiple records may be present in a trailer */
		buffer += sizeof(record->hdr) + record->hdr.len;
		length -= sizeof(record->hdr) + record->hdr.len;
	}

	return status;
}

void ath11k_htc_rx_completion_handler(struct ath11k_base *ab,
				      struct sk_buff *skb)
{
	int status = 0;
	struct ath11k_htc *htc = &ab->htc;
	struct ath11k_htc_hdr *hdr;
	struct ath11k_htc_ep *ep;
	u16 payload_len;
	u32 trailer_len = 0;
	size_t min_len;
	u8 eid;
	bool trailer_present;

	hdr = (struct ath11k_htc_hdr *)skb->data;
	skb_pull(skb, sizeof(*hdr));

	eid = FIELD_GET(HTC_HDR_ENDPOINTID, hdr->htc_info);

	if (eid >= ATH11K_HTC_EP_COUNT) {
		ath11k_warn(ab, "HTC Rx: invalid eid %d\n", eid);
		goto out;
	}

	ep = &htc->endpoint[eid];

	payload_len = FIELD_GET(HTC_HDR_PAYLOADLEN, hdr->htc_info);

	if (payload_len + sizeof(*hdr) > ATH11K_HTC_MAX_LEN) {
		ath11k_warn(ab, "HTC rx frame too long, len: %zu\n",
			    payload_len + sizeof(*hdr));
		goto out;
	}

	if (skb->len < payload_len) {
		ath11k_warn(ab, "HTC Rx: insufficient length, got %d, expected %d\n",
			    skb->len, payload_len);
		goto out;
	}

	/* get flags to check for trailer */
	trailer_present = (FIELD_GET(HTC_HDR_FLAGS, hdr->htc_info)) &
			  ATH11K_HTC_FLAG_TRAILER_PRESENT;

	if (trailer_present) {
		u8 *trailer;

		trailer_len = FIELD_GET(HTC_HDR_CONTROLBYTES0, hdr->ctrl_info);
		min_len = sizeof(struct ath11k_htc_record_hdr);

		if ((trailer_len < min_len) ||
		    (trailer_len > payload_len)) {
			ath11k_warn(ab, "Invalid trailer length: %d\n",
				    trailer_len);
			goto out;
		}

		trailer = (u8 *)hdr;
		trailer += sizeof(*hdr);
		trailer += payload_len;
		trailer -= trailer_len;
		status = ath11k_htc_process_trailer(htc, trailer,
						    trailer_len, eid);
		if (status)
			goto out;

		skb_trim(skb, skb->len - trailer_len);
	}

	if (trailer_len >= payload_len)
		/* zero length packet with trailer data, just drop these */
		goto out;

	if (eid == ATH11K_HTC_EP_0) {
		struct ath11k_htc_msg *msg = (struct ath11k_htc_msg *)skb->data;

		switch (FIELD_GET(HTC_MSG_MESSAGEID, msg->msg_svc_id)) {
		case ATH11K_HTC_MSG_READY_ID:
		case ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
			/* handle HTC control message */
			if (completion_done(&htc->ctl_resp)) {
				/* this is a fatal error, target should not be
				 * sending unsolicited messages on the ep 0
				 */
				ath11k_warn(ab, "HTC rx ctrl still processing\n");
				complete(&htc->ctl_resp);
				goto out;
			}

			htc->control_resp_len =
				min_t(int, skb->len,
				      ATH11K_HTC_MAX_CTRL_MSG_LEN);

			memcpy(htc->control_resp_buffer, skb->data,
			       htc->control_resp_len);

			complete(&htc->ctl_resp);
			break;
		default:
			ath11k_warn(ab, "ignoring unsolicited htc ep0 event\n");
			break;
		}
		goto out;
	}

	ath11k_dbg(ab, ATH11K_DBG_HTC, "htc rx completion ep %d skb %pK\n",
		   eid, skb);
	ep->ep_ops.ep_rx_complete(ab, skb);

	/* poll tx completion for interrupt disabled CE's */
	ath11k_ce_poll_send_completed(ab, ep->ul_pipe_id);

	/* skb is now owned by the rx completion handler */
	skb = NULL;
out:
	kfree_skb(skb);
}

static void ath11k_htc_control_rx_complete(struct ath11k_base *ab,
					   struct sk_buff *skb)
{
	/* This is unexpected. FW is not supposed to send regular rx on this
	 * endpoint.
	 */
	ath11k_warn(ab, "unexpected htc rx\n");
	kfree_skb(skb);
}

static const char *htc_service_name(enum ath11k_htc_svc_id id)
{
	switch (id) {
	case ATH11K_HTC_SVC_ID_RESERVED:
		return "Reserved";
	case ATH11K_HTC_SVC_ID_RSVD_CTRL:
		return "Control";
	case ATH11K_HTC_SVC_ID_WMI_CONTROL:
		return "WMI";
	case ATH11K_HTC_SVC_ID_WMI_DATA_BE:
		return "DATA BE";
	case ATH11K_HTC_SVC_ID_WMI_DATA_BK:
		return "DATA BK";
	case ATH11K_HTC_SVC_ID_WMI_DATA_VI:
		return "DATA VI";
	case ATH11K_HTC_SVC_ID_WMI_DATA_VO:
		return "DATA VO";
	case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1:
		return "WMI MAC1";
	case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2:
		return "WMI MAC2";
	case ATH11K_HTC_SVC_ID_NMI_CONTROL:
		return "NMI Control";
	case ATH11K_HTC_SVC_ID_NMI_DATA:
		return "NMI Data";
	case ATH11K_HTC_SVC_ID_HTT_DATA_MSG:
		return "HTT Data";
	case ATH11K_HTC_SVC_ID_TEST_RAW_STREAMS:
		return "RAW";
	case ATH11K_HTC_SVC_ID_IPA_TX:
		return "IPA TX";
	case ATH11K_HTC_SVC_ID_PKT_LOG:
		return "PKT LOG";
	}

	return "Unknown";
}

static void ath11k_htc_reset_endpoint_states(struct ath11k_htc *htc)
{
	struct ath11k_htc_ep *ep;
	int i;

	for (i = ATH11K_HTC_EP_0; i < ATH11K_HTC_EP_COUNT; i++) {
		ep = &htc->endpoint[i];
		ep->service_id = ATH11K_HTC_SVC_ID_UNUSED;
		ep->max_ep_message_len = 0;
		ep->max_tx_queue_depth = 0;
		ep->eid = i;
		ep->htc = htc;
		ep->tx_credit_flow_enabled = true;
	}
}

static u8 ath11k_htc_get_credit_allocation(struct ath11k_htc *htc,
					   u16 service_id)
{
	u8 i, allocation = 0;

	for (i = 0; i < ATH11K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) {
		if (htc->service_alloc_table[i].service_id == service_id) {
			allocation =
				htc->service_alloc_table[i].credit_allocation;
		}
	}

	return allocation;
}

static int ath11k_htc_setup_target_buffer_assignments(struct ath11k_htc *htc)
{
	struct ath11k_htc_svc_tx_credits *serv_entry;
	u32 svc_id[] = {
		ATH11K_HTC_SVC_ID_WMI_CONTROL,
		ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1,
		ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2,
	};
	int i, credits;

	credits =  htc->total_transmit_credits;
	serv_entry = htc->service_alloc_table;

	if ((htc->wmi_ep_count == 0) ||
	    (htc->wmi_ep_count > ARRAY_SIZE(svc_id)))
		return -EINVAL;

	/* Divide credits among number of endpoints for WMI */
	credits = credits / htc->wmi_ep_count;
	for (i = 0; i < htc->wmi_ep_count; i++) {
		serv_entry[i].service_id = svc_id[i];
		serv_entry[i].credit_allocation = credits;
	}

	return 0;
}

int ath11k_htc_wait_target(struct ath11k_htc *htc)
{
	int i, status = 0;
	struct ath11k_base *ab = htc->ab;
	unsigned long time_left;
	struct ath11k_htc_ready *ready;
	u16 message_id;
	u16 credit_count;
	u16 credit_size;

	time_left = wait_for_completion_timeout(&htc->ctl_resp,
						ATH11K_HTC_WAIT_TIMEOUT_HZ);
	if (!time_left) {
		ath11k_warn(ab, "failed to receive control response completion, polling..\n");

		for (i = 0; i < CE_COUNT; i++)
			ath11k_ce_per_engine_service(htc->ab, i);

		time_left =
			wait_for_completion_timeout(&htc->ctl_resp,
						    ATH11K_HTC_WAIT_TIMEOUT_HZ);

		if (!time_left)
			status = -ETIMEDOUT;
	}

	if (status < 0) {
		ath11k_warn(ab, "ctl_resp never came in (%d)\n", status);
		return status;
	}

	if (htc->control_resp_len < sizeof(*ready)) {
		ath11k_warn(ab, "Invalid HTC ready msg len:%d\n",
			    htc->control_resp_len);
		return -ECOMM;
	}

	ready = (struct ath11k_htc_ready *)htc->control_resp_buffer;
	message_id   = FIELD_GET(HTC_MSG_MESSAGEID, ready->id_credit_count);
	credit_count = FIELD_GET(HTC_READY_MSG_CREDITCOUNT,
				 ready->id_credit_count);
	credit_size  = FIELD_GET(HTC_READY_MSG_CREDITSIZE, ready->size_ep);

	if (message_id != ATH11K_HTC_MSG_READY_ID) {
		ath11k_warn(ab, "Invalid HTC ready msg: 0x%x\n", message_id);
		return -ECOMM;
	}

	htc->total_transmit_credits = credit_count;
	htc->target_credit_size = credit_size;

	ath11k_dbg(ab, ATH11K_DBG_HTC,
		   "Target ready! transmit resources: %d size:%d\n",
		   htc->total_transmit_credits, htc->target_credit_size);

	if ((htc->total_transmit_credits == 0) ||
	    (htc->target_credit_size == 0)) {
		ath11k_warn(ab, "Invalid credit size received\n");
		return -ECOMM;
	}

	ath11k_htc_setup_target_buffer_assignments(htc);

	return 0;
}

int ath11k_htc_connect_service(struct ath11k_htc *htc,
			       struct ath11k_htc_svc_conn_req *conn_req,
			       struct ath11k_htc_svc_conn_resp *conn_resp)
{
	struct ath11k_base *ab = htc->ab;
	struct ath11k_htc_conn_svc *req_msg;
	struct ath11k_htc_conn_svc_resp resp_msg_dummy;
	struct ath11k_htc_conn_svc_resp *resp_msg = &resp_msg_dummy;
	enum ath11k_htc_ep_id assigned_eid = ATH11K_HTC_EP_COUNT;
	struct ath11k_htc_ep *ep;
	struct sk_buff *skb;
	unsigned int max_msg_size = 0;
	int length, status;
	unsigned long time_left;
	bool disable_credit_flow_ctrl = false;
	u16 message_id, service_id, flags = 0;
	u8 tx_alloc = 0;

	/* special case for HTC pseudo control service */
	if (conn_req->service_id == ATH11K_HTC_SVC_ID_RSVD_CTRL) {
		disable_credit_flow_ctrl = true;
		assigned_eid = ATH11K_HTC_EP_0;
		max_msg_size = ATH11K_HTC_MAX_CTRL_MSG_LEN;
		memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
		goto setup;
	}

	tx_alloc = ath11k_htc_get_credit_allocation(htc,
						    conn_req->service_id);
	if (!tx_alloc)
		ath11k_dbg(ab, ATH11K_DBG_BOOT,
			   "boot htc service %s does not allocate target credits\n",
			   htc_service_name(conn_req->service_id));

	skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
	if (!skb) {
		ath11k_warn(ab, "Failed to allocate HTC packet\n");
		return -ENOMEM;
	}

	length = sizeof(*req_msg);
	skb_put(skb, length);
	memset(skb->data, 0, length);

	req_msg = (struct ath11k_htc_conn_svc *)skb->data;
	req_msg->msg_svc_id = FIELD_PREP(HTC_MSG_MESSAGEID,
					 ATH11K_HTC_MSG_CONNECT_SERVICE_ID);

	flags |= FIELD_PREP(ATH11K_HTC_CONN_FLAGS_RECV_ALLOC, tx_alloc);

	/* Only enable credit flow control for WMI ctrl service */
	if (!(conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL ||
	      conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1 ||
	      conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2)) {
		flags |= ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
		disable_credit_flow_ctrl = true;
	}

	req_msg->flags_len = FIELD_PREP(HTC_SVC_MSG_CONNECTIONFLAGS, flags);
	req_msg->msg_svc_id |= FIELD_PREP(HTC_SVC_MSG_SERVICE_ID,
					  conn_req->service_id);

	reinit_completion(&htc->ctl_resp);

	status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
	if (status) {
		kfree_skb(skb);
		return status;
	}

	/* wait for response */
	time_left = wait_for_completion_timeout(&htc->ctl_resp,
						ATH11K_HTC_CONN_SVC_TIMEOUT_HZ);
	if (!time_left) {
		ath11k_err(ab, "Service connect timeout\n");
		return -ETIMEDOUT;
	}

	/* we controlled the buffer creation, it's aligned */
	resp_msg = (struct ath11k_htc_conn_svc_resp *)htc->control_resp_buffer;
	message_id = FIELD_GET(HTC_MSG_MESSAGEID, resp_msg->msg_svc_id);
	service_id = FIELD_GET(HTC_SVC_RESP_MSG_SERVICEID,
			       resp_msg->msg_svc_id);

	if ((message_id != ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
	    (htc->control_resp_len < sizeof(*resp_msg))) {
		ath11k_err(ab, "Invalid resp message ID 0x%x", message_id);
		return -EPROTO;
	}

	ath11k_dbg(ab, ATH11K_DBG_HTC,
		   "HTC Service %s connect response: status: 0x%lx, assigned ep: 0x%lx\n",
		   htc_service_name(service_id),
		   FIELD_GET(HTC_SVC_RESP_MSG_STATUS, resp_msg->flags_len),
		   FIELD_GET(HTC_SVC_RESP_MSG_ENDPOINTID, resp_msg->flags_len));

	conn_resp->connect_resp_code = FIELD_GET(HTC_SVC_RESP_MSG_STATUS,
						 resp_msg->flags_len);

	/* check response status */
	if (conn_resp->connect_resp_code != ATH11K_HTC_CONN_SVC_STATUS_SUCCESS) {
		ath11k_err(ab, "HTC Service %s connect request failed: 0x%x)\n",
			   htc_service_name(service_id),
		       conn_resp->connect_resp_code);
		return -EPROTO;
	}

	assigned_eid = (enum ath11k_htc_ep_id)FIELD_GET(
						HTC_SVC_RESP_MSG_ENDPOINTID,
						resp_msg->flags_len);

	max_msg_size = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
				 resp_msg->flags_len);

setup:

	if (assigned_eid >= ATH11K_HTC_EP_COUNT)
		return -EPROTO;

	if (max_msg_size == 0)
		return -EPROTO;

	ep = &htc->endpoint[assigned_eid];
	ep->eid = assigned_eid;

	if (ep->service_id != ATH11K_HTC_SVC_ID_UNUSED)
		return -EPROTO;

	/* return assigned endpoint to caller */
	conn_resp->eid = assigned_eid;
	conn_resp->max_msg_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
					   resp_msg->flags_len);

	/* setup the endpoint */
	ep->service_id = conn_req->service_id;
	ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
	ep->max_ep_message_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
					   resp_msg->flags_len);
	ep->tx_credits = tx_alloc;

	/* copy all the callbacks */
	ep->ep_ops = conn_req->ep_ops;

	status = ath11k_ahb_map_service_to_pipe(htc->ab,
						ep->service_id,
						&ep->ul_pipe_id,
						&ep->dl_pipe_id);
	if (status)
		return status;

	ath11k_dbg(ab, ATH11K_DBG_BOOT,
		   "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
		   htc_service_name(ep->service_id), ep->ul_pipe_id,
		   ep->dl_pipe_id, ep->eid);

	if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
		ep->tx_credit_flow_enabled = false;
		ath11k_dbg(ab, ATH11K_DBG_BOOT,
			   "boot htc service '%s' eid %d TX flow control disabled\n",
			   htc_service_name(ep->service_id), assigned_eid);
	}

	return status;
}

int ath11k_htc_start(struct ath11k_htc *htc)
{
	struct sk_buff *skb;
	int status = 0;
	struct ath11k_base *ab = htc->ab;
	struct ath11k_htc_setup_complete_extended *msg;

	skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
	if (!skb)
		return -ENOMEM;

	skb_put(skb, sizeof(*msg));
	memset(skb->data, 0, skb->len);

	msg = (struct ath11k_htc_setup_complete_extended *)skb->data;
	msg->msg_id = FIELD_PREP(HTC_MSG_MESSAGEID,
				 ATH11K_HTC_MSG_SETUP_COMPLETE_EX_ID);

	ath11k_dbg(ab, ATH11K_DBG_HTC, "HTC is using TX credit flow control\n");

	status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
	if (status) {
		kfree_skb(skb);
		return status;
	}

	return 0;
}

int ath11k_htc_init(struct ath11k_base *ab)
{
	struct ath11k_htc *htc = &ab->htc;
	struct ath11k_htc_svc_conn_req conn_req;
	struct ath11k_htc_svc_conn_resp conn_resp;
	int ret;

	spin_lock_init(&htc->tx_lock);

	ath11k_htc_reset_endpoint_states(htc);

	htc->ab = ab;

	switch (ab->wmi_sc.preferred_hw_mode) {
	case WMI_HOST_HW_MODE_SINGLE:
		htc->wmi_ep_count = 1;
		break;
	case WMI_HOST_HW_MODE_DBS:
	case WMI_HOST_HW_MODE_DBS_OR_SBS:
		htc->wmi_ep_count = 2;
		break;
	case WMI_HOST_HW_MODE_DBS_SBS:
		htc->wmi_ep_count = 3;
		break;
	default:
		htc->wmi_ep_count = 3;
		break;
	}

	/* setup our pseudo HTC control endpoint connection */
	memset(&conn_req, 0, sizeof(conn_req));
	memset(&conn_resp, 0, sizeof(conn_resp));
	conn_req.ep_ops.ep_tx_complete = ath11k_htc_control_tx_complete;
	conn_req.ep_ops.ep_rx_complete = ath11k_htc_control_rx_complete;
	conn_req.max_send_queue_depth = ATH11K_NUM_CONTROL_TX_BUFFERS;
	conn_req.service_id = ATH11K_HTC_SVC_ID_RSVD_CTRL;

	/* connect fake service */
	ret = ath11k_htc_connect_service(htc, &conn_req, &conn_resp);
	if (ret) {
		ath11k_err(ab, "could not connect to htc service (%d)\n", ret);
		return ret;
	}

	init_completion(&htc->ctl_resp);

	return 0;
}