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