1 // SPDX-License-Identifier: BSD-3-Clause-Clear
2 /*
3 * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
4 * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
5 */
6 #include <linux/skbuff.h>
7 #include <linux/ctype.h>
8
9 #include "debug.h"
10 #include "hif.h"
11
ath11k_htc_alloc_skb(struct ath11k_base * ab,int size)12 struct sk_buff *ath11k_htc_alloc_skb(struct ath11k_base *ab, int size)
13 {
14 struct sk_buff *skb;
15
16 skb = dev_alloc_skb(size + sizeof(struct ath11k_htc_hdr));
17 if (!skb)
18 return NULL;
19
20 skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
21
22 /* FW/HTC requires 4-byte aligned streams */
23 if (!IS_ALIGNED((unsigned long)skb->data, 4))
24 ath11k_warn(ab, "Unaligned HTC tx skb\n");
25
26 return skb;
27 }
28
ath11k_htc_control_tx_complete(struct ath11k_base * ab,struct sk_buff * skb)29 static void ath11k_htc_control_tx_complete(struct ath11k_base *ab,
30 struct sk_buff *skb)
31 {
32 kfree_skb(skb);
33 }
34
ath11k_htc_build_tx_ctrl_skb(void * ab)35 static struct sk_buff *ath11k_htc_build_tx_ctrl_skb(void *ab)
36 {
37 struct sk_buff *skb;
38 struct ath11k_skb_cb *skb_cb;
39
40 skb = dev_alloc_skb(ATH11K_HTC_CONTROL_BUFFER_SIZE);
41 if (!skb)
42 return NULL;
43
44 skb_reserve(skb, sizeof(struct ath11k_htc_hdr));
45 WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4));
46
47 skb_cb = ATH11K_SKB_CB(skb);
48 memset(skb_cb, 0, sizeof(*skb_cb));
49
50 return skb;
51 }
52
ath11k_htc_prepare_tx_skb(struct ath11k_htc_ep * ep,struct sk_buff * skb)53 static void ath11k_htc_prepare_tx_skb(struct ath11k_htc_ep *ep,
54 struct sk_buff *skb)
55 {
56 struct ath11k_htc_hdr *hdr;
57
58 hdr = (struct ath11k_htc_hdr *)skb->data;
59
60 memset(hdr, 0, sizeof(*hdr));
61 hdr->htc_info = FIELD_PREP(HTC_HDR_ENDPOINTID, ep->eid) |
62 FIELD_PREP(HTC_HDR_PAYLOADLEN,
63 (skb->len - sizeof(*hdr)));
64
65 if (ep->tx_credit_flow_enabled)
66 hdr->htc_info |= FIELD_PREP(HTC_HDR_FLAGS,
67 ATH11K_HTC_FLAG_NEED_CREDIT_UPDATE);
68
69 spin_lock_bh(&ep->htc->tx_lock);
70 hdr->ctrl_info = FIELD_PREP(HTC_HDR_CONTROLBYTES1, ep->seq_no++);
71 spin_unlock_bh(&ep->htc->tx_lock);
72 }
73
ath11k_htc_send(struct ath11k_htc * htc,enum ath11k_htc_ep_id eid,struct sk_buff * skb)74 int ath11k_htc_send(struct ath11k_htc *htc,
75 enum ath11k_htc_ep_id eid,
76 struct sk_buff *skb)
77 {
78 struct ath11k_htc_ep *ep = &htc->endpoint[eid];
79 struct ath11k_skb_cb *skb_cb = ATH11K_SKB_CB(skb);
80 struct device *dev = htc->ab->dev;
81 struct ath11k_base *ab = htc->ab;
82 int credits = 0;
83 int ret;
84 bool credit_flow_enabled = (ab->hw_params.credit_flow &&
85 ep->tx_credit_flow_enabled);
86
87 if (eid >= ATH11K_HTC_EP_COUNT) {
88 ath11k_warn(ab, "Invalid endpoint id: %d\n", eid);
89 return -ENOENT;
90 }
91
92 skb_push(skb, sizeof(struct ath11k_htc_hdr));
93
94 if (credit_flow_enabled) {
95 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
96 spin_lock_bh(&htc->tx_lock);
97 if (ep->tx_credits < credits) {
98 ath11k_dbg(ab, ATH11K_DBG_HTC,
99 "ep %d insufficient credits required %d total %d\n",
100 eid, credits, ep->tx_credits);
101 spin_unlock_bh(&htc->tx_lock);
102 ret = -EAGAIN;
103 goto err_pull;
104 }
105 ep->tx_credits -= credits;
106 ath11k_dbg(ab, ATH11K_DBG_HTC,
107 "ep %d credits consumed %d total %d\n",
108 eid, credits, ep->tx_credits);
109 spin_unlock_bh(&htc->tx_lock);
110 }
111
112 ath11k_htc_prepare_tx_skb(ep, skb);
113
114 skb_cb->eid = eid;
115 skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
116 ret = dma_mapping_error(dev, skb_cb->paddr);
117 if (ret) {
118 ret = -EIO;
119 goto err_credits;
120 }
121
122 ath11k_dbg(ab, ATH11K_DBG_HTC, "tx skb %p eid %d paddr %pad\n",
123 skb, skb_cb->eid, &skb_cb->paddr);
124
125 ret = ath11k_ce_send(htc->ab, skb, ep->ul_pipe_id, ep->eid);
126 if (ret)
127 goto err_unmap;
128
129 return 0;
130
131 err_unmap:
132 dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
133 err_credits:
134 if (credit_flow_enabled) {
135 spin_lock_bh(&htc->tx_lock);
136 ep->tx_credits += credits;
137 ath11k_dbg(ab, ATH11K_DBG_HTC,
138 "ep %d credits reverted %d total %d\n",
139 eid, credits, ep->tx_credits);
140 spin_unlock_bh(&htc->tx_lock);
141
142 if (ep->ep_ops.ep_tx_credits)
143 ep->ep_ops.ep_tx_credits(htc->ab);
144 }
145 err_pull:
146 skb_pull(skb, sizeof(struct ath11k_htc_hdr));
147 return ret;
148 }
149
150 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)151 ath11k_htc_process_credit_report(struct ath11k_htc *htc,
152 const struct ath11k_htc_credit_report *report,
153 int len,
154 enum ath11k_htc_ep_id eid)
155 {
156 struct ath11k_base *ab = htc->ab;
157 struct ath11k_htc_ep *ep;
158 int i, n_reports;
159
160 if (len % sizeof(*report))
161 ath11k_warn(ab, "Uneven credit report len %d", len);
162
163 n_reports = len / sizeof(*report);
164
165 spin_lock_bh(&htc->tx_lock);
166 for (i = 0; i < n_reports; i++, report++) {
167 if (report->eid >= ATH11K_HTC_EP_COUNT)
168 break;
169
170 ep = &htc->endpoint[report->eid];
171 ep->tx_credits += report->credits;
172
173 ath11k_dbg(ab, ATH11K_DBG_HTC, "ep %d credits got %d total %d\n",
174 report->eid, report->credits, ep->tx_credits);
175
176 if (ep->ep_ops.ep_tx_credits) {
177 spin_unlock_bh(&htc->tx_lock);
178 ep->ep_ops.ep_tx_credits(htc->ab);
179 spin_lock_bh(&htc->tx_lock);
180 }
181 }
182 spin_unlock_bh(&htc->tx_lock);
183 }
184
ath11k_htc_process_trailer(struct ath11k_htc * htc,u8 * buffer,int length,enum ath11k_htc_ep_id src_eid)185 static int ath11k_htc_process_trailer(struct ath11k_htc *htc,
186 u8 *buffer,
187 int length,
188 enum ath11k_htc_ep_id src_eid)
189 {
190 struct ath11k_base *ab = htc->ab;
191 int status = 0;
192 struct ath11k_htc_record *record;
193 size_t len;
194
195 while (length > 0) {
196 record = (struct ath11k_htc_record *)buffer;
197
198 if (length < sizeof(record->hdr)) {
199 status = -EINVAL;
200 break;
201 }
202
203 if (record->hdr.len > length) {
204 /* no room left in buffer for record */
205 ath11k_warn(ab, "Invalid record length: %d\n",
206 record->hdr.len);
207 status = -EINVAL;
208 break;
209 }
210
211 if (ab->hw_params.credit_flow) {
212 switch (record->hdr.id) {
213 case ATH11K_HTC_RECORD_CREDITS:
214 len = sizeof(struct ath11k_htc_credit_report);
215 if (record->hdr.len < len) {
216 ath11k_warn(ab, "Credit report too long\n");
217 status = -EINVAL;
218 break;
219 }
220 ath11k_htc_process_credit_report(htc,
221 record->credit_report,
222 record->hdr.len,
223 src_eid);
224 break;
225 default:
226 ath11k_warn(ab, "Unhandled record: id:%d length:%d\n",
227 record->hdr.id, record->hdr.len);
228 break;
229 }
230 }
231
232 if (status)
233 break;
234
235 /* multiple records may be present in a trailer */
236 buffer += sizeof(record->hdr) + record->hdr.len;
237 length -= sizeof(record->hdr) + record->hdr.len;
238 }
239
240 return status;
241 }
242
ath11k_htc_suspend_complete(struct ath11k_base * ab,bool ack)243 static void ath11k_htc_suspend_complete(struct ath11k_base *ab, bool ack)
244 {
245 ath11k_dbg(ab, ATH11K_DBG_BOOT, "suspend complete %d\n", ack);
246
247 if (ack)
248 set_bit(ATH11K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);
249 else
250 clear_bit(ATH11K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);
251
252 complete(&ab->htc_suspend);
253 }
254
ath11k_htc_tx_completion_handler(struct ath11k_base * ab,struct sk_buff * skb)255 void ath11k_htc_tx_completion_handler(struct ath11k_base *ab,
256 struct sk_buff *skb)
257 {
258 struct ath11k_htc *htc = &ab->htc;
259 struct ath11k_htc_ep *ep;
260 void (*ep_tx_complete)(struct ath11k_base *, struct sk_buff *);
261 u8 eid;
262
263 eid = ATH11K_SKB_CB(skb)->eid;
264 if (eid >= ATH11K_HTC_EP_COUNT) {
265 dev_kfree_skb_any(skb);
266 return;
267 }
268
269 ep = &htc->endpoint[eid];
270 spin_lock_bh(&htc->tx_lock);
271 ep_tx_complete = ep->ep_ops.ep_tx_complete;
272 spin_unlock_bh(&htc->tx_lock);
273 if (!ep_tx_complete) {
274 dev_kfree_skb_any(skb);
275 return;
276 }
277 ep_tx_complete(htc->ab, skb);
278 }
279
ath11k_htc_wakeup_from_suspend(struct ath11k_base * ab)280 static void ath11k_htc_wakeup_from_suspend(struct ath11k_base *ab)
281 {
282 ath11k_dbg(ab, ATH11K_DBG_BOOT, "wakeup from suspend is received\n");
283 }
284
ath11k_htc_rx_completion_handler(struct ath11k_base * ab,struct sk_buff * skb)285 void ath11k_htc_rx_completion_handler(struct ath11k_base *ab,
286 struct sk_buff *skb)
287 {
288 int status = 0;
289 struct ath11k_htc *htc = &ab->htc;
290 struct ath11k_htc_hdr *hdr;
291 struct ath11k_htc_ep *ep;
292 u16 payload_len;
293 u32 message_id, trailer_len = 0;
294 size_t min_len;
295 u8 eid;
296 bool trailer_present;
297
298 hdr = (struct ath11k_htc_hdr *)skb->data;
299 skb_pull(skb, sizeof(*hdr));
300
301 eid = FIELD_GET(HTC_HDR_ENDPOINTID, hdr->htc_info);
302
303 if (eid >= ATH11K_HTC_EP_COUNT) {
304 ath11k_warn(ab, "HTC Rx: invalid eid %d\n", eid);
305 goto out;
306 }
307
308 ep = &htc->endpoint[eid];
309
310 payload_len = FIELD_GET(HTC_HDR_PAYLOADLEN, hdr->htc_info);
311
312 if (payload_len + sizeof(*hdr) > ATH11K_HTC_MAX_LEN) {
313 ath11k_warn(ab, "HTC rx frame too long, len: %zu\n",
314 payload_len + sizeof(*hdr));
315 goto out;
316 }
317
318 if (skb->len < payload_len) {
319 ath11k_warn(ab, "HTC Rx: insufficient length, got %d, expected %d\n",
320 skb->len, payload_len);
321 goto out;
322 }
323
324 /* get flags to check for trailer */
325 trailer_present = (FIELD_GET(HTC_HDR_FLAGS, hdr->htc_info)) &
326 ATH11K_HTC_FLAG_TRAILER_PRESENT;
327
328 ath11k_dbg(ab, ATH11K_DBG_HTC, "rx ep %d skb %p trailer_present %d\n",
329 eid, skb, trailer_present);
330
331 if (trailer_present) {
332 u8 *trailer;
333
334 trailer_len = FIELD_GET(HTC_HDR_CONTROLBYTES0, hdr->ctrl_info);
335 min_len = sizeof(struct ath11k_htc_record_hdr);
336
337 if ((trailer_len < min_len) ||
338 (trailer_len > payload_len)) {
339 ath11k_warn(ab, "Invalid trailer length: %d\n",
340 trailer_len);
341 goto out;
342 }
343
344 trailer = (u8 *)hdr;
345 trailer += sizeof(*hdr);
346 trailer += payload_len;
347 trailer -= trailer_len;
348 status = ath11k_htc_process_trailer(htc, trailer,
349 trailer_len, eid);
350 if (status)
351 goto out;
352
353 skb_trim(skb, skb->len - trailer_len);
354 }
355
356 if (trailer_len >= payload_len)
357 /* zero length packet with trailer data, just drop these */
358 goto out;
359
360 if (eid == ATH11K_HTC_EP_0) {
361 struct ath11k_htc_msg *msg = (struct ath11k_htc_msg *)skb->data;
362
363 message_id = FIELD_GET(HTC_MSG_MESSAGEID, msg->msg_svc_id);
364
365 ath11k_dbg(ab, ATH11K_DBG_HTC, "rx ep %d skb %p message_id %d\n",
366 eid, skb, message_id);
367
368 switch (message_id) {
369 case ATH11K_HTC_MSG_READY_ID:
370 case ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID:
371 /* handle HTC control message */
372 if (completion_done(&htc->ctl_resp)) {
373 /* this is a fatal error, target should not be
374 * sending unsolicited messages on the ep 0
375 */
376 ath11k_warn(ab, "HTC rx ctrl still processing\n");
377 complete(&htc->ctl_resp);
378 goto out;
379 }
380
381 htc->control_resp_len =
382 min_t(int, skb->len,
383 ATH11K_HTC_MAX_CTRL_MSG_LEN);
384
385 memcpy(htc->control_resp_buffer, skb->data,
386 htc->control_resp_len);
387
388 complete(&htc->ctl_resp);
389 break;
390 case ATH11K_HTC_MSG_SEND_SUSPEND_COMPLETE:
391 ath11k_htc_suspend_complete(ab, true);
392 break;
393 case ATH11K_HTC_MSG_NACK_SUSPEND:
394 ath11k_htc_suspend_complete(ab, false);
395 break;
396 case ATH11K_HTC_MSG_WAKEUP_FROM_SUSPEND_ID:
397 ath11k_htc_wakeup_from_suspend(ab);
398 break;
399 default:
400 ath11k_warn(ab, "ignoring unsolicited htc ep0 event %ld\n",
401 FIELD_GET(HTC_MSG_MESSAGEID, msg->msg_svc_id));
402 break;
403 }
404 goto out;
405 }
406
407 ep->ep_ops.ep_rx_complete(ab, skb);
408
409 /* poll tx completion for interrupt disabled CE's */
410 ath11k_ce_poll_send_completed(ab, ep->ul_pipe_id);
411
412 /* skb is now owned by the rx completion handler */
413 skb = NULL;
414 out:
415 kfree_skb(skb);
416 }
417
ath11k_htc_control_rx_complete(struct ath11k_base * ab,struct sk_buff * skb)418 static void ath11k_htc_control_rx_complete(struct ath11k_base *ab,
419 struct sk_buff *skb)
420 {
421 /* This is unexpected. FW is not supposed to send regular rx on this
422 * endpoint.
423 */
424 ath11k_warn(ab, "unexpected htc rx\n");
425 kfree_skb(skb);
426 }
427
htc_service_name(enum ath11k_htc_svc_id id)428 static const char *htc_service_name(enum ath11k_htc_svc_id id)
429 {
430 switch (id) {
431 case ATH11K_HTC_SVC_ID_RESERVED:
432 return "Reserved";
433 case ATH11K_HTC_SVC_ID_RSVD_CTRL:
434 return "Control";
435 case ATH11K_HTC_SVC_ID_WMI_CONTROL:
436 return "WMI";
437 case ATH11K_HTC_SVC_ID_WMI_DATA_BE:
438 return "DATA BE";
439 case ATH11K_HTC_SVC_ID_WMI_DATA_BK:
440 return "DATA BK";
441 case ATH11K_HTC_SVC_ID_WMI_DATA_VI:
442 return "DATA VI";
443 case ATH11K_HTC_SVC_ID_WMI_DATA_VO:
444 return "DATA VO";
445 case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1:
446 return "WMI MAC1";
447 case ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2:
448 return "WMI MAC2";
449 case ATH11K_HTC_SVC_ID_NMI_CONTROL:
450 return "NMI Control";
451 case ATH11K_HTC_SVC_ID_NMI_DATA:
452 return "NMI Data";
453 case ATH11K_HTC_SVC_ID_HTT_DATA_MSG:
454 return "HTT Data";
455 case ATH11K_HTC_SVC_ID_TEST_RAW_STREAMS:
456 return "RAW";
457 case ATH11K_HTC_SVC_ID_IPA_TX:
458 return "IPA TX";
459 case ATH11K_HTC_SVC_ID_PKT_LOG:
460 return "PKT LOG";
461 }
462
463 return "Unknown";
464 }
465
ath11k_htc_reset_endpoint_states(struct ath11k_htc * htc)466 static void ath11k_htc_reset_endpoint_states(struct ath11k_htc *htc)
467 {
468 struct ath11k_htc_ep *ep;
469 int i;
470
471 for (i = ATH11K_HTC_EP_0; i < ATH11K_HTC_EP_COUNT; i++) {
472 ep = &htc->endpoint[i];
473 ep->service_id = ATH11K_HTC_SVC_ID_UNUSED;
474 ep->max_ep_message_len = 0;
475 ep->max_tx_queue_depth = 0;
476 ep->eid = i;
477 ep->htc = htc;
478 ep->tx_credit_flow_enabled = true;
479 }
480 }
481
ath11k_htc_get_credit_allocation(struct ath11k_htc * htc,u16 service_id)482 static u8 ath11k_htc_get_credit_allocation(struct ath11k_htc *htc,
483 u16 service_id)
484 {
485 u8 i, allocation = 0;
486
487 for (i = 0; i < ATH11K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) {
488 if (htc->service_alloc_table[i].service_id == service_id) {
489 allocation =
490 htc->service_alloc_table[i].credit_allocation;
491 }
492 }
493
494 return allocation;
495 }
496
ath11k_htc_setup_target_buffer_assignments(struct ath11k_htc * htc)497 static int ath11k_htc_setup_target_buffer_assignments(struct ath11k_htc *htc)
498 {
499 struct ath11k_htc_svc_tx_credits *serv_entry;
500 u32 svc_id[] = {
501 ATH11K_HTC_SVC_ID_WMI_CONTROL,
502 ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1,
503 ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2,
504 };
505 int i, credits;
506
507 credits = htc->total_transmit_credits;
508 serv_entry = htc->service_alloc_table;
509
510 if ((htc->wmi_ep_count == 0) ||
511 (htc->wmi_ep_count > ARRAY_SIZE(svc_id)))
512 return -EINVAL;
513
514 /* Divide credits among number of endpoints for WMI */
515 credits = credits / htc->wmi_ep_count;
516 for (i = 0; i < htc->wmi_ep_count; i++) {
517 serv_entry[i].service_id = svc_id[i];
518 serv_entry[i].credit_allocation = credits;
519 }
520
521 return 0;
522 }
523
ath11k_htc_wait_target(struct ath11k_htc * htc)524 int ath11k_htc_wait_target(struct ath11k_htc *htc)
525 {
526 int i, status = 0;
527 struct ath11k_base *ab = htc->ab;
528 unsigned long time_left;
529 struct ath11k_htc_ready *ready;
530 u16 message_id;
531 u16 credit_count;
532 u16 credit_size;
533
534 time_left = wait_for_completion_timeout(&htc->ctl_resp,
535 ATH11K_HTC_WAIT_TIMEOUT_HZ);
536 if (!time_left) {
537 ath11k_warn(ab, "failed to receive control response completion, polling..\n");
538
539 for (i = 0; i < ab->hw_params.ce_count; i++)
540 ath11k_ce_per_engine_service(htc->ab, i);
541
542 time_left =
543 wait_for_completion_timeout(&htc->ctl_resp,
544 ATH11K_HTC_WAIT_TIMEOUT_HZ);
545
546 if (!time_left)
547 status = -ETIMEDOUT;
548 }
549
550 if (status < 0) {
551 ath11k_warn(ab, "ctl_resp never came in (%d)\n", status);
552 return status;
553 }
554
555 if (htc->control_resp_len < sizeof(*ready)) {
556 ath11k_warn(ab, "Invalid HTC ready msg len:%d\n",
557 htc->control_resp_len);
558 return -ECOMM;
559 }
560
561 ready = (struct ath11k_htc_ready *)htc->control_resp_buffer;
562 message_id = FIELD_GET(HTC_MSG_MESSAGEID, ready->id_credit_count);
563 credit_count = FIELD_GET(HTC_READY_MSG_CREDITCOUNT,
564 ready->id_credit_count);
565 credit_size = FIELD_GET(HTC_READY_MSG_CREDITSIZE, ready->size_ep);
566
567 if (message_id != ATH11K_HTC_MSG_READY_ID) {
568 ath11k_warn(ab, "Invalid HTC ready msg: 0x%x\n", message_id);
569 return -ECOMM;
570 }
571
572 htc->total_transmit_credits = credit_count;
573 htc->target_credit_size = credit_size;
574
575 ath11k_dbg(ab, ATH11K_DBG_HTC,
576 "target ready total_transmit_credits %d target_credit_size %d\n",
577 htc->total_transmit_credits, htc->target_credit_size);
578
579 if ((htc->total_transmit_credits == 0) ||
580 (htc->target_credit_size == 0)) {
581 ath11k_warn(ab, "Invalid credit size received\n");
582 return -ECOMM;
583 }
584
585 /* For QCA6390, wmi endpoint uses 1 credit to avoid
586 * back-to-back write.
587 */
588 if (ab->hw_params.supports_shadow_regs)
589 htc->total_transmit_credits = 1;
590
591 ath11k_htc_setup_target_buffer_assignments(htc);
592
593 return 0;
594 }
595
ath11k_htc_connect_service(struct ath11k_htc * htc,struct ath11k_htc_svc_conn_req * conn_req,struct ath11k_htc_svc_conn_resp * conn_resp)596 int ath11k_htc_connect_service(struct ath11k_htc *htc,
597 struct ath11k_htc_svc_conn_req *conn_req,
598 struct ath11k_htc_svc_conn_resp *conn_resp)
599 {
600 struct ath11k_base *ab = htc->ab;
601 struct ath11k_htc_conn_svc *req_msg;
602 struct ath11k_htc_conn_svc_resp resp_msg_dummy;
603 struct ath11k_htc_conn_svc_resp *resp_msg = &resp_msg_dummy;
604 enum ath11k_htc_ep_id assigned_eid = ATH11K_HTC_EP_COUNT;
605 struct ath11k_htc_ep *ep;
606 struct sk_buff *skb;
607 unsigned int max_msg_size = 0;
608 int length, status;
609 unsigned long time_left;
610 bool disable_credit_flow_ctrl = false;
611 u16 message_id, service_id, flags = 0;
612 u8 tx_alloc = 0;
613
614 /* special case for HTC pseudo control service */
615 if (conn_req->service_id == ATH11K_HTC_SVC_ID_RSVD_CTRL) {
616 disable_credit_flow_ctrl = true;
617 assigned_eid = ATH11K_HTC_EP_0;
618 max_msg_size = ATH11K_HTC_MAX_CTRL_MSG_LEN;
619 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
620 goto setup;
621 }
622
623 tx_alloc = ath11k_htc_get_credit_allocation(htc,
624 conn_req->service_id);
625 if (!tx_alloc)
626 ath11k_dbg(ab, ATH11K_DBG_BOOT,
627 "htc service %s does not allocate target credits\n",
628 htc_service_name(conn_req->service_id));
629
630 skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
631 if (!skb) {
632 ath11k_warn(ab, "Failed to allocate HTC packet\n");
633 return -ENOMEM;
634 }
635
636 length = sizeof(*req_msg);
637 skb_put(skb, length);
638 memset(skb->data, 0, length);
639
640 req_msg = (struct ath11k_htc_conn_svc *)skb->data;
641 req_msg->msg_svc_id = FIELD_PREP(HTC_MSG_MESSAGEID,
642 ATH11K_HTC_MSG_CONNECT_SERVICE_ID);
643
644 flags |= FIELD_PREP(ATH11K_HTC_CONN_FLAGS_RECV_ALLOC, tx_alloc);
645
646 /* Only enable credit flow control for WMI ctrl service */
647 if (!(conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL ||
648 conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC1 ||
649 conn_req->service_id == ATH11K_HTC_SVC_ID_WMI_CONTROL_MAC2)) {
650 flags |= ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
651 disable_credit_flow_ctrl = true;
652 }
653
654 if (!ab->hw_params.credit_flow) {
655 flags |= ATH11K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
656 disable_credit_flow_ctrl = true;
657 }
658
659 req_msg->flags_len = FIELD_PREP(HTC_SVC_MSG_CONNECTIONFLAGS, flags);
660 req_msg->msg_svc_id |= FIELD_PREP(HTC_SVC_MSG_SERVICE_ID,
661 conn_req->service_id);
662
663 reinit_completion(&htc->ctl_resp);
664
665 status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
666 if (status) {
667 kfree_skb(skb);
668 return status;
669 }
670
671 /* wait for response */
672 time_left = wait_for_completion_timeout(&htc->ctl_resp,
673 ATH11K_HTC_CONN_SVC_TIMEOUT_HZ);
674 if (!time_left) {
675 ath11k_err(ab, "Service connect timeout\n");
676 return -ETIMEDOUT;
677 }
678
679 /* we controlled the buffer creation, it's aligned */
680 resp_msg = (struct ath11k_htc_conn_svc_resp *)htc->control_resp_buffer;
681 message_id = FIELD_GET(HTC_MSG_MESSAGEID, resp_msg->msg_svc_id);
682 service_id = FIELD_GET(HTC_SVC_RESP_MSG_SERVICEID,
683 resp_msg->msg_svc_id);
684
685 if ((message_id != ATH11K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
686 (htc->control_resp_len < sizeof(*resp_msg))) {
687 ath11k_err(ab, "Invalid resp message ID 0x%x", message_id);
688 return -EPROTO;
689 }
690
691 ath11k_dbg(ab, ATH11K_DBG_HTC,
692 "service %s connect response status 0x%lx assigned ep 0x%lx\n",
693 htc_service_name(service_id),
694 FIELD_GET(HTC_SVC_RESP_MSG_STATUS, resp_msg->flags_len),
695 FIELD_GET(HTC_SVC_RESP_MSG_ENDPOINTID, resp_msg->flags_len));
696
697 conn_resp->connect_resp_code = FIELD_GET(HTC_SVC_RESP_MSG_STATUS,
698 resp_msg->flags_len);
699
700 /* check response status */
701 if (conn_resp->connect_resp_code != ATH11K_HTC_CONN_SVC_STATUS_SUCCESS) {
702 ath11k_err(ab, "HTC Service %s connect request failed: 0x%x)\n",
703 htc_service_name(service_id),
704 conn_resp->connect_resp_code);
705 return -EPROTO;
706 }
707
708 assigned_eid = (enum ath11k_htc_ep_id)FIELD_GET(
709 HTC_SVC_RESP_MSG_ENDPOINTID,
710 resp_msg->flags_len);
711
712 max_msg_size = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
713 resp_msg->flags_len);
714
715 setup:
716
717 if (assigned_eid >= ATH11K_HTC_EP_COUNT)
718 return -EPROTO;
719
720 if (max_msg_size == 0)
721 return -EPROTO;
722
723 ep = &htc->endpoint[assigned_eid];
724 ep->eid = assigned_eid;
725
726 if (ep->service_id != ATH11K_HTC_SVC_ID_UNUSED)
727 return -EPROTO;
728
729 /* return assigned endpoint to caller */
730 conn_resp->eid = assigned_eid;
731 conn_resp->max_msg_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
732 resp_msg->flags_len);
733
734 /* setup the endpoint */
735 ep->service_id = conn_req->service_id;
736 ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
737 ep->max_ep_message_len = FIELD_GET(HTC_SVC_RESP_MSG_MAXMSGSIZE,
738 resp_msg->flags_len);
739 ep->tx_credits = tx_alloc;
740
741 /* copy all the callbacks */
742 ep->ep_ops = conn_req->ep_ops;
743
744 status = ath11k_hif_map_service_to_pipe(htc->ab,
745 ep->service_id,
746 &ep->ul_pipe_id,
747 &ep->dl_pipe_id);
748 if (status)
749 return status;
750
751 ath11k_dbg(ab, ATH11K_DBG_BOOT,
752 "htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
753 htc_service_name(ep->service_id), ep->ul_pipe_id,
754 ep->dl_pipe_id, ep->eid);
755
756 if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
757 ep->tx_credit_flow_enabled = false;
758 ath11k_dbg(ab, ATH11K_DBG_BOOT,
759 "htc service '%s' eid %d tx flow control disabled\n",
760 htc_service_name(ep->service_id), assigned_eid);
761 }
762
763 return status;
764 }
765
ath11k_htc_start(struct ath11k_htc * htc)766 int ath11k_htc_start(struct ath11k_htc *htc)
767 {
768 struct sk_buff *skb;
769 int status = 0;
770 struct ath11k_base *ab = htc->ab;
771 struct ath11k_htc_setup_complete_extended *msg;
772
773 skb = ath11k_htc_build_tx_ctrl_skb(htc->ab);
774 if (!skb)
775 return -ENOMEM;
776
777 skb_put(skb, sizeof(*msg));
778 memset(skb->data, 0, skb->len);
779
780 msg = (struct ath11k_htc_setup_complete_extended *)skb->data;
781 msg->msg_id = FIELD_PREP(HTC_MSG_MESSAGEID,
782 ATH11K_HTC_MSG_SETUP_COMPLETE_EX_ID);
783
784 if (ab->hw_params.credit_flow)
785 ath11k_dbg(ab, ATH11K_DBG_HTC, "using tx credit flow control\n");
786 else
787 msg->flags |= ATH11K_GLOBAL_DISABLE_CREDIT_FLOW;
788
789 status = ath11k_htc_send(htc, ATH11K_HTC_EP_0, skb);
790 if (status) {
791 kfree_skb(skb);
792 return status;
793 }
794
795 return 0;
796 }
797
ath11k_htc_init(struct ath11k_base * ab)798 int ath11k_htc_init(struct ath11k_base *ab)
799 {
800 struct ath11k_htc *htc = &ab->htc;
801 struct ath11k_htc_svc_conn_req conn_req;
802 struct ath11k_htc_svc_conn_resp conn_resp;
803 int ret;
804
805 spin_lock_init(&htc->tx_lock);
806
807 ath11k_htc_reset_endpoint_states(htc);
808
809 htc->ab = ab;
810
811 switch (ab->wmi_ab.preferred_hw_mode) {
812 case WMI_HOST_HW_MODE_SINGLE:
813 htc->wmi_ep_count = 1;
814 break;
815 case WMI_HOST_HW_MODE_DBS:
816 case WMI_HOST_HW_MODE_DBS_OR_SBS:
817 htc->wmi_ep_count = 2;
818 break;
819 case WMI_HOST_HW_MODE_DBS_SBS:
820 htc->wmi_ep_count = 3;
821 break;
822 default:
823 htc->wmi_ep_count = ab->hw_params.max_radios;
824 break;
825 }
826
827 /* setup our pseudo HTC control endpoint connection */
828 memset(&conn_req, 0, sizeof(conn_req));
829 memset(&conn_resp, 0, sizeof(conn_resp));
830 conn_req.ep_ops.ep_tx_complete = ath11k_htc_control_tx_complete;
831 conn_req.ep_ops.ep_rx_complete = ath11k_htc_control_rx_complete;
832 conn_req.max_send_queue_depth = ATH11K_NUM_CONTROL_TX_BUFFERS;
833 conn_req.service_id = ATH11K_HTC_SVC_ID_RSVD_CTRL;
834
835 /* connect fake service */
836 ret = ath11k_htc_connect_service(htc, &conn_req, &conn_resp);
837 if (ret) {
838 ath11k_err(ab, "could not connect to htc service (%d)\n", ret);
839 return ret;
840 }
841
842 init_completion(&htc->ctl_resp);
843
844 return 0;
845 }
846