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1/*
2 * Copyright (c) 2005-2011 Atheros Communications Inc.
3 * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include "core.h"
19#include "hif.h"
20#include "debug.h"
21
22/********/
23/* Send */
24/********/
25
26static inline void ath10k_htc_send_complete_check(struct ath10k_htc_ep *ep,
27 int force)
28{
29 /*
30 * Check whether HIF has any prior sends that have finished,
31 * have not had the post-processing done.
32 */
33 ath10k_hif_send_complete_check(ep->htc->ar, ep->ul_pipe_id, force);
34}
35
36static void ath10k_htc_control_tx_complete(struct ath10k *ar,
37 struct sk_buff *skb)
38{
39 kfree_skb(skb);
40}
41
42static struct sk_buff *ath10k_htc_build_tx_ctrl_skb(void *ar)
43{
44 struct sk_buff *skb;
45 struct ath10k_skb_cb *skb_cb;
46
47 skb = dev_alloc_skb(ATH10K_HTC_CONTROL_BUFFER_SIZE);
48 if (!skb) {
49 ath10k_warn("Unable to allocate ctrl skb\n");
50 return NULL;
51 }
52
53 skb_reserve(skb, 20); /* FIXME: why 20 bytes? */
54 WARN_ONCE((unsigned long)skb->data & 3, "unaligned skb");
55
56 skb_cb = ATH10K_SKB_CB(skb);
57 memset(skb_cb, 0, sizeof(*skb_cb));
58
59 ath10k_dbg(ATH10K_DBG_HTC, "%s: skb %p\n", __func__, skb);
60 return skb;
61}
62
63static inline void ath10k_htc_restore_tx_skb(struct ath10k_htc *htc,
64 struct sk_buff *skb)
65{
66 struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
67
68 dma_unmap_single(htc->ar->dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
69 skb_pull(skb, sizeof(struct ath10k_htc_hdr));
70}
71
72static void ath10k_htc_notify_tx_completion(struct ath10k_htc_ep *ep,
73 struct sk_buff *skb)
74{
75 ath10k_dbg(ATH10K_DBG_HTC, "%s: ep %d skb %p\n", __func__,
76 ep->eid, skb);
77
78 ath10k_htc_restore_tx_skb(ep->htc, skb);
79
80 if (!ep->ep_ops.ep_tx_complete) {
81 ath10k_warn("no tx handler for eid %d\n", ep->eid);
82 dev_kfree_skb_any(skb);
83 return;
84 }
85
86 ep->ep_ops.ep_tx_complete(ep->htc->ar, skb);
87}
88
89/* assumes tx_lock is held */
90static bool ath10k_htc_ep_need_credit_update(struct ath10k_htc_ep *ep)
91{
92 if (!ep->tx_credit_flow_enabled)
93 return false;
94 if (ep->tx_credits >= ep->tx_credits_per_max_message)
95 return false;
96
97 ath10k_dbg(ATH10K_DBG_HTC, "HTC: endpoint %d needs credit update\n",
98 ep->eid);
99 return true;
100}
101
102static void ath10k_htc_prepare_tx_skb(struct ath10k_htc_ep *ep,
103 struct sk_buff *skb)
104{
105 struct ath10k_htc_hdr *hdr;
106
107 hdr = (struct ath10k_htc_hdr *)skb->data;
108
109 hdr->eid = ep->eid;
110 hdr->len = __cpu_to_le16(skb->len - sizeof(*hdr));
111 hdr->flags = 0;
112
113 spin_lock_bh(&ep->htc->tx_lock);
114 hdr->seq_no = ep->seq_no++;
115
116 if (ath10k_htc_ep_need_credit_update(ep))
117 hdr->flags |= ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE;
118
119 spin_unlock_bh(&ep->htc->tx_lock);
120}
121
122int ath10k_htc_send(struct ath10k_htc *htc,
123 enum ath10k_htc_ep_id eid,
124 struct sk_buff *skb)
125{
126 struct ath10k_htc_ep *ep = &htc->endpoint[eid];
127 struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
128 struct ath10k_hif_sg_item sg_item;
129 struct device *dev = htc->ar->dev;
130 int credits = 0;
131 int ret;
132
133 if (htc->ar->state == ATH10K_STATE_WEDGED)
134 return -ECOMM;
135
136 if (eid >= ATH10K_HTC_EP_COUNT) {
137 ath10k_warn("Invalid endpoint id: %d\n", eid);
138 return -ENOENT;
139 }
140
141 /* FIXME: This looks ugly, can we fix it? */
142 spin_lock_bh(&htc->tx_lock);
143 if (htc->stopped) {
144 spin_unlock_bh(&htc->tx_lock);
145 return -ESHUTDOWN;
146 }
147 spin_unlock_bh(&htc->tx_lock);
148
149 skb_push(skb, sizeof(struct ath10k_htc_hdr));
150
151 if (ep->tx_credit_flow_enabled) {
152 credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);
153 spin_lock_bh(&htc->tx_lock);
154 if (ep->tx_credits < credits) {
155 spin_unlock_bh(&htc->tx_lock);
156 ret = -EAGAIN;
157 goto err_pull;
158 }
159 ep->tx_credits -= credits;
160 spin_unlock_bh(&htc->tx_lock);
161 }
162
163 ath10k_htc_prepare_tx_skb(ep, skb);
164
165 skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
166 ret = dma_mapping_error(dev, skb_cb->paddr);
167 if (ret)
168 goto err_credits;
169
170 sg_item.transfer_id = ep->eid;
171 sg_item.transfer_context = skb;
172 sg_item.vaddr = skb->data;
173 sg_item.paddr = skb_cb->paddr;
174 sg_item.len = skb->len;
175
176 ret = ath10k_hif_tx_sg(htc->ar, ep->ul_pipe_id, &sg_item, 1);
177 if (ret)
178 goto err_unmap;
179
180 return 0;
181
182err_unmap:
183 dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);
184err_credits:
185 if (ep->tx_credit_flow_enabled) {
186 spin_lock_bh(&htc->tx_lock);
187 ep->tx_credits += credits;
188 spin_unlock_bh(&htc->tx_lock);
189
190 if (ep->ep_ops.ep_tx_credits)
191 ep->ep_ops.ep_tx_credits(htc->ar);
192 }
193err_pull:
194 skb_pull(skb, sizeof(struct ath10k_htc_hdr));
195 return ret;
196}
197
198static int ath10k_htc_tx_completion_handler(struct ath10k *ar,
199 struct sk_buff *skb,
200 unsigned int eid)
201{
202 struct ath10k_htc *htc = &ar->htc;
203 struct ath10k_htc_ep *ep = &htc->endpoint[eid];
204
205 if (WARN_ON_ONCE(!skb))
206 return 0;
207
208 ath10k_htc_notify_tx_completion(ep, skb);
209 /* the skb now belongs to the completion handler */
210
211 return 0;
212}
213
214/***********/
215/* Receive */
216/***********/
217
218static void
219ath10k_htc_process_credit_report(struct ath10k_htc *htc,
220 const struct ath10k_htc_credit_report *report,
221 int len,
222 enum ath10k_htc_ep_id eid)
223{
224 struct ath10k_htc_ep *ep;
225 int i, n_reports;
226
227 if (len % sizeof(*report))
228 ath10k_warn("Uneven credit report len %d", len);
229
230 n_reports = len / sizeof(*report);
231
232 spin_lock_bh(&htc->tx_lock);
233 for (i = 0; i < n_reports; i++, report++) {
234 if (report->eid >= ATH10K_HTC_EP_COUNT)
235 break;
236
237 ath10k_dbg(ATH10K_DBG_HTC, "ep %d got %d credits\n",
238 report->eid, report->credits);
239
240 ep = &htc->endpoint[report->eid];
241 ep->tx_credits += report->credits;
242
243 if (ep->ep_ops.ep_tx_credits) {
244 spin_unlock_bh(&htc->tx_lock);
245 ep->ep_ops.ep_tx_credits(htc->ar);
246 spin_lock_bh(&htc->tx_lock);
247 }
248 }
249 spin_unlock_bh(&htc->tx_lock);
250}
251
252static int ath10k_htc_process_trailer(struct ath10k_htc *htc,
253 u8 *buffer,
254 int length,
255 enum ath10k_htc_ep_id src_eid)
256{
257 int status = 0;
258 struct ath10k_htc_record *record;
259 u8 *orig_buffer;
260 int orig_length;
261 size_t len;
262
263 orig_buffer = buffer;
264 orig_length = length;
265
266 while (length > 0) {
267 record = (struct ath10k_htc_record *)buffer;
268
269 if (length < sizeof(record->hdr)) {
270 status = -EINVAL;
271 break;
272 }
273
274 if (record->hdr.len > length) {
275 /* no room left in buffer for record */
276 ath10k_warn("Invalid record length: %d\n",
277 record->hdr.len);
278 status = -EINVAL;
279 break;
280 }
281
282 switch (record->hdr.id) {
283 case ATH10K_HTC_RECORD_CREDITS:
284 len = sizeof(struct ath10k_htc_credit_report);
285 if (record->hdr.len < len) {
286 ath10k_warn("Credit report too long\n");
287 status = -EINVAL;
288 break;
289 }
290 ath10k_htc_process_credit_report(htc,
291 record->credit_report,
292 record->hdr.len,
293 src_eid);
294 break;
295 default:
296 ath10k_warn("Unhandled record: id:%d length:%d\n",
297 record->hdr.id, record->hdr.len);
298 break;
299 }
300
301 if (status)
302 break;
303
304 /* multiple records may be present in a trailer */
305 buffer += sizeof(record->hdr) + record->hdr.len;
306 length -= sizeof(record->hdr) + record->hdr.len;
307 }
308
309 if (status)
310 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc rx bad trailer", "",
311 orig_buffer, orig_length);
312
313 return status;
314}
315
316static int ath10k_htc_rx_completion_handler(struct ath10k *ar,
317 struct sk_buff *skb,
318 u8 pipe_id)
319{
320 int status = 0;
321 struct ath10k_htc *htc = &ar->htc;
322 struct ath10k_htc_hdr *hdr;
323 struct ath10k_htc_ep *ep;
324 u16 payload_len;
325 u32 trailer_len = 0;
326 size_t min_len;
327 u8 eid;
328 bool trailer_present;
329
330 hdr = (struct ath10k_htc_hdr *)skb->data;
331 skb_pull(skb, sizeof(*hdr));
332
333 eid = hdr->eid;
334
335 if (eid >= ATH10K_HTC_EP_COUNT) {
336 ath10k_warn("HTC Rx: invalid eid %d\n", eid);
337 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad header", "",
338 hdr, sizeof(*hdr));
339 status = -EINVAL;
340 goto out;
341 }
342
343 ep = &htc->endpoint[eid];
344
345 /*
346 * If this endpoint that received a message from the target has
347 * a to-target HIF pipe whose send completions are polled rather
348 * than interrupt-driven, this is a good point to ask HIF to check
349 * whether it has any completed sends to handle.
350 */
351 if (ep->ul_is_polled)
352 ath10k_htc_send_complete_check(ep, 1);
353
354 payload_len = __le16_to_cpu(hdr->len);
355
356 if (payload_len + sizeof(*hdr) > ATH10K_HTC_MAX_LEN) {
357 ath10k_warn("HTC rx frame too long, len: %zu\n",
358 payload_len + sizeof(*hdr));
359 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len", "",
360 hdr, sizeof(*hdr));
361 status = -EINVAL;
362 goto out;
363 }
364
365 if (skb->len < payload_len) {
366 ath10k_dbg(ATH10K_DBG_HTC,
367 "HTC Rx: insufficient length, got %d, expected %d\n",
368 skb->len, payload_len);
369 ath10k_dbg_dump(ATH10K_DBG_HTC, "htc bad rx pkt len",
370 "", hdr, sizeof(*hdr));
371 status = -EINVAL;
372 goto out;
373 }
374
375 /* get flags to check for trailer */
376 trailer_present = hdr->flags & ATH10K_HTC_FLAG_TRAILER_PRESENT;
377 if (trailer_present) {
378 u8 *trailer;
379
380 trailer_len = hdr->trailer_len;
381 min_len = sizeof(struct ath10k_ath10k_htc_record_hdr);
382
383 if ((trailer_len < min_len) ||
384 (trailer_len > payload_len)) {
385 ath10k_warn("Invalid trailer length: %d\n",
386 trailer_len);
387 status = -EPROTO;
388 goto out;
389 }
390
391 trailer = (u8 *)hdr;
392 trailer += sizeof(*hdr);
393 trailer += payload_len;
394 trailer -= trailer_len;
395 status = ath10k_htc_process_trailer(htc, trailer,
396 trailer_len, hdr->eid);
397 if (status)
398 goto out;
399
400 skb_trim(skb, skb->len - trailer_len);
401 }
402
403 if (((int)payload_len - (int)trailer_len) <= 0)
404 /* zero length packet with trailer data, just drop these */
405 goto out;
406
407 if (eid == ATH10K_HTC_EP_0) {
408 struct ath10k_htc_msg *msg = (struct ath10k_htc_msg *)skb->data;
409
410 switch (__le16_to_cpu(msg->hdr.message_id)) {
411 default:
412 /* handle HTC control message */
413 if (completion_done(&htc->ctl_resp)) {
414 /*
415 * this is a fatal error, target should not be
416 * sending unsolicited messages on the ep 0
417 */
418 ath10k_warn("HTC rx ctrl still processing\n");
419 status = -EINVAL;
420 complete(&htc->ctl_resp);
421 goto out;
422 }
423
424 htc->control_resp_len =
425 min_t(int, skb->len,
426 ATH10K_HTC_MAX_CTRL_MSG_LEN);
427
428 memcpy(htc->control_resp_buffer, skb->data,
429 htc->control_resp_len);
430
431 complete(&htc->ctl_resp);
432 break;
433 case ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE:
434 htc->htc_ops.target_send_suspend_complete(ar);
435 }
436 goto out;
437 }
438
439 ath10k_dbg(ATH10K_DBG_HTC, "htc rx completion ep %d skb %p\n",
440 eid, skb);
441 ep->ep_ops.ep_rx_complete(ar, skb);
442
443 /* skb is now owned by the rx completion handler */
444 skb = NULL;
445out:
446 kfree_skb(skb);
447
448 return status;
449}
450
451static void ath10k_htc_control_rx_complete(struct ath10k *ar,
452 struct sk_buff *skb)
453{
454 /* This is unexpected. FW is not supposed to send regular rx on this
455 * endpoint. */
456 ath10k_warn("unexpected htc rx\n");
457 kfree_skb(skb);
458}
459
460/***************/
461/* Init/Deinit */
462/***************/
463
464static const char *htc_service_name(enum ath10k_htc_svc_id id)
465{
466 switch (id) {
467 case ATH10K_HTC_SVC_ID_RESERVED:
468 return "Reserved";
469 case ATH10K_HTC_SVC_ID_RSVD_CTRL:
470 return "Control";
471 case ATH10K_HTC_SVC_ID_WMI_CONTROL:
472 return "WMI";
473 case ATH10K_HTC_SVC_ID_WMI_DATA_BE:
474 return "DATA BE";
475 case ATH10K_HTC_SVC_ID_WMI_DATA_BK:
476 return "DATA BK";
477 case ATH10K_HTC_SVC_ID_WMI_DATA_VI:
478 return "DATA VI";
479 case ATH10K_HTC_SVC_ID_WMI_DATA_VO:
480 return "DATA VO";
481 case ATH10K_HTC_SVC_ID_NMI_CONTROL:
482 return "NMI Control";
483 case ATH10K_HTC_SVC_ID_NMI_DATA:
484 return "NMI Data";
485 case ATH10K_HTC_SVC_ID_HTT_DATA_MSG:
486 return "HTT Data";
487 case ATH10K_HTC_SVC_ID_TEST_RAW_STREAMS:
488 return "RAW";
489 }
490
491 return "Unknown";
492}
493
494static void ath10k_htc_reset_endpoint_states(struct ath10k_htc *htc)
495{
496 struct ath10k_htc_ep *ep;
497 int i;
498
499 for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) {
500 ep = &htc->endpoint[i];
501 ep->service_id = ATH10K_HTC_SVC_ID_UNUSED;
502 ep->max_ep_message_len = 0;
503 ep->max_tx_queue_depth = 0;
504 ep->eid = i;
505 ep->htc = htc;
506 ep->tx_credit_flow_enabled = true;
507 }
508}
509
510static void ath10k_htc_setup_target_buffer_assignments(struct ath10k_htc *htc)
511{
512 struct ath10k_htc_svc_tx_credits *entry;
513
514 entry = &htc->service_tx_alloc[0];
515
516 /*
517 * for PCIE allocate all credists/HTC buffers to WMI.
518 * no buffers are used/required for data. data always
519 * remains on host.
520 */
521 entry++;
522 entry->service_id = ATH10K_HTC_SVC_ID_WMI_CONTROL;
523 entry->credit_allocation = htc->total_transmit_credits;
524}
525
526static u8 ath10k_htc_get_credit_allocation(struct ath10k_htc *htc,
527 u16 service_id)
528{
529 u8 allocation = 0;
530 int i;
531
532 for (i = 0; i < ATH10K_HTC_EP_COUNT; i++) {
533 if (htc->service_tx_alloc[i].service_id == service_id)
534 allocation =
535 htc->service_tx_alloc[i].credit_allocation;
536 }
537
538 return allocation;
539}
540
541int ath10k_htc_wait_target(struct ath10k_htc *htc)
542{
543 int status = 0;
544 struct ath10k_htc_svc_conn_req conn_req;
545 struct ath10k_htc_svc_conn_resp conn_resp;
546 struct ath10k_htc_msg *msg;
547 u16 message_id;
548 u16 credit_count;
549 u16 credit_size;
550
551 status = wait_for_completion_timeout(&htc->ctl_resp,
552 ATH10K_HTC_WAIT_TIMEOUT_HZ);
553 if (status <= 0) {
554 if (status == 0)
555 status = -ETIMEDOUT;
556
557 ath10k_err("ctl_resp never came in (%d)\n", status);
558 return status;
559 }
560
561 if (htc->control_resp_len < sizeof(msg->hdr) + sizeof(msg->ready)) {
562 ath10k_err("Invalid HTC ready msg len:%d\n",
563 htc->control_resp_len);
564 return -ECOMM;
565 }
566
567 msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
568 message_id = __le16_to_cpu(msg->hdr.message_id);
569 credit_count = __le16_to_cpu(msg->ready.credit_count);
570 credit_size = __le16_to_cpu(msg->ready.credit_size);
571
572 if (message_id != ATH10K_HTC_MSG_READY_ID) {
573 ath10k_err("Invalid HTC ready msg: 0x%x\n", message_id);
574 return -ECOMM;
575 }
576
577 htc->total_transmit_credits = credit_count;
578 htc->target_credit_size = credit_size;
579
580 ath10k_dbg(ATH10K_DBG_HTC,
581 "Target ready! transmit resources: %d size:%d\n",
582 htc->total_transmit_credits,
583 htc->target_credit_size);
584
585 if ((htc->total_transmit_credits == 0) ||
586 (htc->target_credit_size == 0)) {
587 ath10k_err("Invalid credit size received\n");
588 return -ECOMM;
589 }
590
591 ath10k_htc_setup_target_buffer_assignments(htc);
592
593 /* setup our pseudo HTC control endpoint connection */
594 memset(&conn_req, 0, sizeof(conn_req));
595 memset(&conn_resp, 0, sizeof(conn_resp));
596 conn_req.ep_ops.ep_tx_complete = ath10k_htc_control_tx_complete;
597 conn_req.ep_ops.ep_rx_complete = ath10k_htc_control_rx_complete;
598 conn_req.max_send_queue_depth = ATH10K_NUM_CONTROL_TX_BUFFERS;
599 conn_req.service_id = ATH10K_HTC_SVC_ID_RSVD_CTRL;
600
601 /* connect fake service */
602 status = ath10k_htc_connect_service(htc, &conn_req, &conn_resp);
603 if (status) {
604 ath10k_err("could not connect to htc service (%d)\n", status);
605 return status;
606 }
607
608 return 0;
609}
610
611int ath10k_htc_connect_service(struct ath10k_htc *htc,
612 struct ath10k_htc_svc_conn_req *conn_req,
613 struct ath10k_htc_svc_conn_resp *conn_resp)
614{
615 struct ath10k_htc_msg *msg;
616 struct ath10k_htc_conn_svc *req_msg;
617 struct ath10k_htc_conn_svc_response resp_msg_dummy;
618 struct ath10k_htc_conn_svc_response *resp_msg = &resp_msg_dummy;
619 enum ath10k_htc_ep_id assigned_eid = ATH10K_HTC_EP_COUNT;
620 struct ath10k_htc_ep *ep;
621 struct sk_buff *skb;
622 unsigned int max_msg_size = 0;
623 int length, status;
624 bool disable_credit_flow_ctrl = false;
625 u16 message_id, service_id, flags = 0;
626 u8 tx_alloc = 0;
627
628 /* special case for HTC pseudo control service */
629 if (conn_req->service_id == ATH10K_HTC_SVC_ID_RSVD_CTRL) {
630 disable_credit_flow_ctrl = true;
631 assigned_eid = ATH10K_HTC_EP_0;
632 max_msg_size = ATH10K_HTC_MAX_CTRL_MSG_LEN;
633 memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));
634 goto setup;
635 }
636
637 tx_alloc = ath10k_htc_get_credit_allocation(htc,
638 conn_req->service_id);
639 if (!tx_alloc)
640 ath10k_dbg(ATH10K_DBG_BOOT,
641 "boot htc service %s does not allocate target credits\n",
642 htc_service_name(conn_req->service_id));
643
644 skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
645 if (!skb) {
646 ath10k_err("Failed to allocate HTC packet\n");
647 return -ENOMEM;
648 }
649
650 length = sizeof(msg->hdr) + sizeof(msg->connect_service);
651 skb_put(skb, length);
652 memset(skb->data, 0, length);
653
654 msg = (struct ath10k_htc_msg *)skb->data;
655 msg->hdr.message_id =
656 __cpu_to_le16(ATH10K_HTC_MSG_CONNECT_SERVICE_ID);
657
658 flags |= SM(tx_alloc, ATH10K_HTC_CONN_FLAGS_RECV_ALLOC);
659
660 /* Only enable credit flow control for WMI ctrl service */
661 if (conn_req->service_id != ATH10K_HTC_SVC_ID_WMI_CONTROL) {
662 flags |= ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;
663 disable_credit_flow_ctrl = true;
664 }
665
666 req_msg = &msg->connect_service;
667 req_msg->flags = __cpu_to_le16(flags);
668 req_msg->service_id = __cpu_to_le16(conn_req->service_id);
669
670 reinit_completion(&htc->ctl_resp);
671
672 status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
673 if (status) {
674 kfree_skb(skb);
675 return status;
676 }
677
678 /* wait for response */
679 status = wait_for_completion_timeout(&htc->ctl_resp,
680 ATH10K_HTC_CONN_SVC_TIMEOUT_HZ);
681 if (status <= 0) {
682 if (status == 0)
683 status = -ETIMEDOUT;
684 ath10k_err("Service connect timeout: %d\n", status);
685 return status;
686 }
687
688 /* we controlled the buffer creation, it's aligned */
689 msg = (struct ath10k_htc_msg *)htc->control_resp_buffer;
690 resp_msg = &msg->connect_service_response;
691 message_id = __le16_to_cpu(msg->hdr.message_id);
692 service_id = __le16_to_cpu(resp_msg->service_id);
693
694 if ((message_id != ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||
695 (htc->control_resp_len < sizeof(msg->hdr) +
696 sizeof(msg->connect_service_response))) {
697 ath10k_err("Invalid resp message ID 0x%x", message_id);
698 return -EPROTO;
699 }
700
701 ath10k_dbg(ATH10K_DBG_HTC,
702 "HTC Service %s connect response: status: 0x%x, assigned ep: 0x%x\n",
703 htc_service_name(service_id),
704 resp_msg->status, resp_msg->eid);
705
706 conn_resp->connect_resp_code = resp_msg->status;
707
708 /* check response status */
709 if (resp_msg->status != ATH10K_HTC_CONN_SVC_STATUS_SUCCESS) {
710 ath10k_err("HTC Service %s connect request failed: 0x%x)\n",
711 htc_service_name(service_id),
712 resp_msg->status);
713 return -EPROTO;
714 }
715
716 assigned_eid = (enum ath10k_htc_ep_id)resp_msg->eid;
717 max_msg_size = __le16_to_cpu(resp_msg->max_msg_size);
718
719setup:
720
721 if (assigned_eid >= ATH10K_HTC_EP_COUNT)
722 return -EPROTO;
723
724 if (max_msg_size == 0)
725 return -EPROTO;
726
727 ep = &htc->endpoint[assigned_eid];
728 ep->eid = assigned_eid;
729
730 if (ep->service_id != ATH10K_HTC_SVC_ID_UNUSED)
731 return -EPROTO;
732
733 /* return assigned endpoint to caller */
734 conn_resp->eid = assigned_eid;
735 conn_resp->max_msg_len = __le16_to_cpu(resp_msg->max_msg_size);
736
737 /* setup the endpoint */
738 ep->service_id = conn_req->service_id;
739 ep->max_tx_queue_depth = conn_req->max_send_queue_depth;
740 ep->max_ep_message_len = __le16_to_cpu(resp_msg->max_msg_size);
741 ep->tx_credits = tx_alloc;
742 ep->tx_credit_size = htc->target_credit_size;
743 ep->tx_credits_per_max_message = ep->max_ep_message_len /
744 htc->target_credit_size;
745
746 if (ep->max_ep_message_len % htc->target_credit_size)
747 ep->tx_credits_per_max_message++;
748
749 /* copy all the callbacks */
750 ep->ep_ops = conn_req->ep_ops;
751
752 status = ath10k_hif_map_service_to_pipe(htc->ar,
753 ep->service_id,
754 &ep->ul_pipe_id,
755 &ep->dl_pipe_id,
756 &ep->ul_is_polled,
757 &ep->dl_is_polled);
758 if (status)
759 return status;
760
761 ath10k_dbg(ATH10K_DBG_BOOT,
762 "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",
763 htc_service_name(ep->service_id), ep->ul_pipe_id,
764 ep->dl_pipe_id, ep->eid);
765
766 ath10k_dbg(ATH10K_DBG_BOOT,
767 "boot htc ep %d ul polled %d dl polled %d\n",
768 ep->eid, ep->ul_is_polled, ep->dl_is_polled);
769
770 if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {
771 ep->tx_credit_flow_enabled = false;
772 ath10k_dbg(ATH10K_DBG_BOOT,
773 "boot htc service '%s' eid %d TX flow control disabled\n",
774 htc_service_name(ep->service_id), assigned_eid);
775 }
776
777 return status;
778}
779
780struct sk_buff *ath10k_htc_alloc_skb(int size)
781{
782 struct sk_buff *skb;
783
784 skb = dev_alloc_skb(size + sizeof(struct ath10k_htc_hdr));
785 if (!skb) {
786 ath10k_warn("could not allocate HTC tx skb\n");
787 return NULL;
788 }
789
790 skb_reserve(skb, sizeof(struct ath10k_htc_hdr));
791
792 /* FW/HTC requires 4-byte aligned streams */
793 if (!IS_ALIGNED((unsigned long)skb->data, 4))
794 ath10k_warn("Unaligned HTC tx skb\n");
795
796 return skb;
797}
798
799int ath10k_htc_start(struct ath10k_htc *htc)
800{
801 struct sk_buff *skb;
802 int status = 0;
803 struct ath10k_htc_msg *msg;
804
805 skb = ath10k_htc_build_tx_ctrl_skb(htc->ar);
806 if (!skb)
807 return -ENOMEM;
808
809 skb_put(skb, sizeof(msg->hdr) + sizeof(msg->setup_complete_ext));
810 memset(skb->data, 0, skb->len);
811
812 msg = (struct ath10k_htc_msg *)skb->data;
813 msg->hdr.message_id =
814 __cpu_to_le16(ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID);
815
816 ath10k_dbg(ATH10K_DBG_HTC, "HTC is using TX credit flow control\n");
817
818 status = ath10k_htc_send(htc, ATH10K_HTC_EP_0, skb);
819 if (status) {
820 kfree_skb(skb);
821 return status;
822 }
823
824 return 0;
825}
826
827/*
828 * stop HTC communications, i.e. stop interrupt reception, and flush all
829 * queued buffers
830 */
831void ath10k_htc_stop(struct ath10k_htc *htc)
832{
833 spin_lock_bh(&htc->tx_lock);
834 htc->stopped = true;
835 spin_unlock_bh(&htc->tx_lock);
836
837 ath10k_hif_stop(htc->ar);
838}
839
840/* registered target arrival callback from the HIF layer */
841int ath10k_htc_init(struct ath10k *ar)
842{
843 struct ath10k_hif_cb htc_callbacks;
844 struct ath10k_htc_ep *ep = NULL;
845 struct ath10k_htc *htc = &ar->htc;
846
847 spin_lock_init(&htc->tx_lock);
848
849 htc->stopped = false;
850 ath10k_htc_reset_endpoint_states(htc);
851
852 /* setup HIF layer callbacks */
853 htc_callbacks.rx_completion = ath10k_htc_rx_completion_handler;
854 htc_callbacks.tx_completion = ath10k_htc_tx_completion_handler;
855 htc->ar = ar;
856
857 /* Get HIF default pipe for HTC message exchange */
858 ep = &htc->endpoint[ATH10K_HTC_EP_0];
859
860 ath10k_hif_set_callbacks(ar, &htc_callbacks);
861 ath10k_hif_get_default_pipe(ar, &ep->ul_pipe_id, &ep->dl_pipe_id);
862
863 init_completion(&htc->ctl_resp);
864
865 return 0;
866}