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1// SPDX-License-Identifier: BSD-3-Clause-Clear2/*3 * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.4 * Copyright (c) 2021-2022, 2024 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 12struct sk_buff *ath12k_htc_alloc_skb(struct ath12k_base *ab, int size)13{14	struct sk_buff *skb;15 16	skb = dev_alloc_skb(size + sizeof(struct ath12k_htc_hdr));17	if (!skb)18		return NULL;19 20	skb_reserve(skb, sizeof(struct ath12k_htc_hdr));21 22	/* FW/HTC requires 4-byte aligned streams */23	if (!IS_ALIGNED((unsigned long)skb->data, 4))24		ath12k_warn(ab, "Unaligned HTC tx skb\n");25 26	return skb;27}28 29static void ath12k_htc_control_tx_complete(struct ath12k_base *ab,30					   struct sk_buff *skb)31{32	kfree_skb(skb);33}34 35static struct sk_buff *ath12k_htc_build_tx_ctrl_skb(void)36{37	struct sk_buff *skb;38	struct ath12k_skb_cb *skb_cb;39 40	skb = dev_alloc_skb(ATH12K_HTC_CONTROL_BUFFER_SIZE);41	if (!skb)42		return NULL;43 44	skb_reserve(skb, sizeof(struct ath12k_htc_hdr));45	WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4));46 47	skb_cb = ATH12K_SKB_CB(skb);48	memset(skb_cb, 0, sizeof(*skb_cb));49 50	return skb;51}52 53static void ath12k_htc_prepare_tx_skb(struct ath12k_htc_ep *ep,54				      struct sk_buff *skb)55{56	struct ath12k_htc_hdr *hdr;57 58	hdr = (struct ath12k_htc_hdr *)skb->data;59 60	memset(hdr, 0, sizeof(*hdr));61	hdr->htc_info = le32_encode_bits(ep->eid, HTC_HDR_ENDPOINTID) |62			le32_encode_bits((skb->len - sizeof(*hdr)),63					 HTC_HDR_PAYLOADLEN);64 65	if (ep->tx_credit_flow_enabled)66		hdr->htc_info |= le32_encode_bits(ATH12K_HTC_FLAG_NEED_CREDIT_UPDATE,67						  HTC_HDR_FLAGS);68 69	spin_lock_bh(&ep->htc->tx_lock);70	hdr->ctrl_info = le32_encode_bits(ep->seq_no++, HTC_HDR_CONTROLBYTES1);71	spin_unlock_bh(&ep->htc->tx_lock);72}73 74int ath12k_htc_send(struct ath12k_htc *htc,75		    enum ath12k_htc_ep_id eid,76		    struct sk_buff *skb)77{78	struct ath12k_htc_ep *ep = &htc->endpoint[eid];79	struct ath12k_skb_cb *skb_cb = ATH12K_SKB_CB(skb);80	struct device *dev = htc->ab->dev;81	struct ath12k_base *ab = htc->ab;82	int credits = 0;83	int ret;84 85	if (eid >= ATH12K_HTC_EP_COUNT) {86		ath12k_warn(ab, "Invalid endpoint id: %d\n", eid);87		return -ENOENT;88	}89 90	skb_push(skb, sizeof(struct ath12k_htc_hdr));91 92	if (ep->tx_credit_flow_enabled) {93		credits = DIV_ROUND_UP(skb->len, htc->target_credit_size);94		spin_lock_bh(&htc->tx_lock);95		if (ep->tx_credits < credits) {96			ath12k_dbg(ab, ATH12K_DBG_HTC,97				   "htc insufficient credits ep %d required %d available %d\n",98				   eid, credits, ep->tx_credits);99			spin_unlock_bh(&htc->tx_lock);100			ret = -EAGAIN;101			goto err_pull;102		}103		ep->tx_credits -= credits;104		ath12k_dbg(ab, ATH12K_DBG_HTC,105			   "htc ep %d consumed %d credits (total %d)\n",106			   eid, credits, ep->tx_credits);107		spin_unlock_bh(&htc->tx_lock);108	}109 110	ath12k_htc_prepare_tx_skb(ep, skb);111 112	skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);113	ret = dma_mapping_error(dev, skb_cb->paddr);114	if (ret) {115		ret = -EIO;116		goto err_credits;117	}118 119	ret = ath12k_ce_send(htc->ab, skb, ep->ul_pipe_id, ep->eid);120	if (ret)121		goto err_unmap;122 123	return 0;124 125err_unmap:126	dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE);127err_credits:128	if (ep->tx_credit_flow_enabled) {129		spin_lock_bh(&htc->tx_lock);130		ep->tx_credits += credits;131		ath12k_dbg(ab, ATH12K_DBG_HTC,132			   "htc ep %d reverted %d credits back (total %d)\n",133			   eid, credits, ep->tx_credits);134		spin_unlock_bh(&htc->tx_lock);135 136		if (ep->ep_ops.ep_tx_credits)137			ep->ep_ops.ep_tx_credits(htc->ab);138	}139err_pull:140	skb_pull(skb, sizeof(struct ath12k_htc_hdr));141	return ret;142}143 144static void145ath12k_htc_process_credit_report(struct ath12k_htc *htc,146				 const struct ath12k_htc_credit_report *report,147				 int len,148				 enum ath12k_htc_ep_id eid)149{150	struct ath12k_base *ab = htc->ab;151	struct ath12k_htc_ep *ep;152	int i, n_reports;153 154	if (len % sizeof(*report))155		ath12k_warn(ab, "Uneven credit report len %d", len);156 157	n_reports = len / sizeof(*report);158 159	spin_lock_bh(&htc->tx_lock);160	for (i = 0; i < n_reports; i++, report++) {161		if (report->eid >= ATH12K_HTC_EP_COUNT)162			break;163 164		ep = &htc->endpoint[report->eid];165		ep->tx_credits += report->credits;166 167		ath12k_dbg(ab, ATH12K_DBG_HTC, "htc ep %d got %d credits (total %d)\n",168			   report->eid, report->credits, ep->tx_credits);169 170		if (ep->ep_ops.ep_tx_credits) {171			spin_unlock_bh(&htc->tx_lock);172			ep->ep_ops.ep_tx_credits(htc->ab);173			spin_lock_bh(&htc->tx_lock);174		}175	}176	spin_unlock_bh(&htc->tx_lock);177}178 179static int ath12k_htc_process_trailer(struct ath12k_htc *htc,180				      u8 *buffer,181				      int length,182				      enum ath12k_htc_ep_id src_eid)183{184	struct ath12k_base *ab = htc->ab;185	int status = 0;186	struct ath12k_htc_record *record;187	size_t len;188 189	while (length > 0) {190		record = (struct ath12k_htc_record *)buffer;191 192		if (length < sizeof(record->hdr)) {193			status = -EINVAL;194			break;195		}196 197		if (record->hdr.len > length) {198			/* no room left in buffer for record */199			ath12k_warn(ab, "Invalid record length: %d\n",200				    record->hdr.len);201			status = -EINVAL;202			break;203		}204 205		switch (record->hdr.id) {206		case ATH12K_HTC_RECORD_CREDITS:207			len = sizeof(struct ath12k_htc_credit_report);208			if (record->hdr.len < len) {209				ath12k_warn(ab, "Credit report too long\n");210				status = -EINVAL;211				break;212			}213			ath12k_htc_process_credit_report(htc,214							 record->credit_report,215							 record->hdr.len,216							 src_eid);217			break;218		default:219			ath12k_warn(ab, "Unhandled record: id:%d length:%d\n",220				    record->hdr.id, record->hdr.len);221			break;222		}223 224		if (status)225			break;226 227		/* multiple records may be present in a trailer */228		buffer += sizeof(record->hdr) + record->hdr.len;229		length -= sizeof(record->hdr) + record->hdr.len;230	}231 232	return status;233}234 235static void ath12k_htc_suspend_complete(struct ath12k_base *ab, bool ack)236{237	ath12k_dbg(ab, ATH12K_DBG_BOOT, "boot suspend complete %d\n", ack);238 239	if (ack)240		set_bit(ATH12K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);241	else242		clear_bit(ATH12K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags);243 244	complete(&ab->htc_suspend);245}246 247static void ath12k_htc_wakeup_from_suspend(struct ath12k_base *ab)248{249	ath12k_dbg(ab, ATH12K_DBG_BOOT, "boot wakeup from suspend is received\n");250}251 252void ath12k_htc_rx_completion_handler(struct ath12k_base *ab,253				      struct sk_buff *skb)254{255	int status = 0;256	struct ath12k_htc *htc = &ab->htc;257	struct ath12k_htc_hdr *hdr;258	struct ath12k_htc_ep *ep;259	u16 payload_len;260	u32 trailer_len = 0;261	size_t min_len;262	u8 eid;263	bool trailer_present;264 265	hdr = (struct ath12k_htc_hdr *)skb->data;266	skb_pull(skb, sizeof(*hdr));267 268	eid = le32_get_bits(hdr->htc_info, HTC_HDR_ENDPOINTID);269 270	if (eid >= ATH12K_HTC_EP_COUNT) {271		ath12k_warn(ab, "HTC Rx: invalid eid %d\n", eid);272		goto out;273	}274 275	ep = &htc->endpoint[eid];276 277	payload_len = le32_get_bits(hdr->htc_info, HTC_HDR_PAYLOADLEN);278 279	if (payload_len + sizeof(*hdr) > ATH12K_HTC_MAX_LEN) {280		ath12k_warn(ab, "HTC rx frame too long, len: %zu\n",281			    payload_len + sizeof(*hdr));282		goto out;283	}284 285	if (skb->len < payload_len) {286		ath12k_warn(ab, "HTC Rx: insufficient length, got %d, expected %d\n",287			    skb->len, payload_len);288		goto out;289	}290 291	/* get flags to check for trailer */292	trailer_present = le32_get_bits(hdr->htc_info, HTC_HDR_FLAGS) &293			  ATH12K_HTC_FLAG_TRAILER_PRESENT;294 295	if (trailer_present) {296		u8 *trailer;297 298		trailer_len = le32_get_bits(hdr->ctrl_info,299					    HTC_HDR_CONTROLBYTES0);300		min_len = sizeof(struct ath12k_htc_record_hdr);301 302		if ((trailer_len < min_len) ||303		    (trailer_len > payload_len)) {304			ath12k_warn(ab, "Invalid trailer length: %d\n",305				    trailer_len);306			goto out;307		}308 309		trailer = (u8 *)hdr;310		trailer += sizeof(*hdr);311		trailer += payload_len;312		trailer -= trailer_len;313		status = ath12k_htc_process_trailer(htc, trailer,314						    trailer_len, eid);315		if (status)316			goto out;317 318		skb_trim(skb, skb->len - trailer_len);319	}320 321	if (trailer_len >= payload_len)322		/* zero length packet with trailer data, just drop these */323		goto out;324 325	if (eid == ATH12K_HTC_EP_0) {326		struct ath12k_htc_msg *msg = (struct ath12k_htc_msg *)skb->data;327 328		switch (le32_get_bits(msg->msg_svc_id, HTC_MSG_MESSAGEID)) {329		case ATH12K_HTC_MSG_READY_ID:330		case ATH12K_HTC_MSG_CONNECT_SERVICE_RESP_ID:331			/* handle HTC control message */332			if (completion_done(&htc->ctl_resp)) {333				/* this is a fatal error, target should not be334				 * sending unsolicited messages on the ep 0335				 */336				ath12k_warn(ab, "HTC rx ctrl still processing\n");337				complete(&htc->ctl_resp);338				goto out;339			}340 341			htc->control_resp_len =342				min_t(int, skb->len,343				      ATH12K_HTC_MAX_CTRL_MSG_LEN);344 345			memcpy(htc->control_resp_buffer, skb->data,346			       htc->control_resp_len);347 348			complete(&htc->ctl_resp);349			break;350		case ATH12K_HTC_MSG_SEND_SUSPEND_COMPLETE:351			ath12k_htc_suspend_complete(ab, true);352			break;353		case ATH12K_HTC_MSG_NACK_SUSPEND:354			ath12k_htc_suspend_complete(ab, false);355			break;356		case ATH12K_HTC_MSG_WAKEUP_FROM_SUSPEND_ID:357			ath12k_htc_wakeup_from_suspend(ab);358			break;359		default:360			ath12k_warn(ab, "ignoring unsolicited htc ep0 event %u\n",361				    le32_get_bits(msg->msg_svc_id, HTC_MSG_MESSAGEID));362			break;363		}364		goto out;365	}366 367	ath12k_dbg(ab, ATH12K_DBG_HTC, "htc rx completion ep %d skb %p\n",368		   eid, skb);369	ep->ep_ops.ep_rx_complete(ab, skb);370 371	/* poll tx completion for interrupt disabled CE's */372	ath12k_ce_poll_send_completed(ab, ep->ul_pipe_id);373 374	/* skb is now owned by the rx completion handler */375	skb = NULL;376out:377	kfree_skb(skb);378}379 380static void ath12k_htc_control_rx_complete(struct ath12k_base *ab,381					   struct sk_buff *skb)382{383	/* This is unexpected. FW is not supposed to send regular rx on this384	 * endpoint.385	 */386	ath12k_warn(ab, "unexpected htc rx\n");387	kfree_skb(skb);388}389 390static const char *htc_service_name(enum ath12k_htc_svc_id id)391{392	switch (id) {393	case ATH12K_HTC_SVC_ID_RESERVED:394		return "Reserved";395	case ATH12K_HTC_SVC_ID_RSVD_CTRL:396		return "Control";397	case ATH12K_HTC_SVC_ID_WMI_CONTROL:398		return "WMI";399	case ATH12K_HTC_SVC_ID_WMI_DATA_BE:400		return "DATA BE";401	case ATH12K_HTC_SVC_ID_WMI_DATA_BK:402		return "DATA BK";403	case ATH12K_HTC_SVC_ID_WMI_DATA_VI:404		return "DATA VI";405	case ATH12K_HTC_SVC_ID_WMI_DATA_VO:406		return "DATA VO";407	case ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1:408		return "WMI MAC1";409	case ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2:410		return "WMI MAC2";411	case ATH12K_HTC_SVC_ID_NMI_CONTROL:412		return "NMI Control";413	case ATH12K_HTC_SVC_ID_NMI_DATA:414		return "NMI Data";415	case ATH12K_HTC_SVC_ID_HTT_DATA_MSG:416		return "HTT Data";417	case ATH12K_HTC_SVC_ID_TEST_RAW_STREAMS:418		return "RAW";419	case ATH12K_HTC_SVC_ID_IPA_TX:420		return "IPA TX";421	case ATH12K_HTC_SVC_ID_PKT_LOG:422		return "PKT LOG";423	case ATH12K_HTC_SVC_ID_WMI_CONTROL_DIAG:424		return "WMI DIAG";425	}426 427	return "Unknown";428}429 430static void ath12k_htc_reset_endpoint_states(struct ath12k_htc *htc)431{432	struct ath12k_htc_ep *ep;433	int i;434 435	for (i = ATH12K_HTC_EP_0; i < ATH12K_HTC_EP_COUNT; i++) {436		ep = &htc->endpoint[i];437		ep->service_id = ATH12K_HTC_SVC_ID_UNUSED;438		ep->max_ep_message_len = 0;439		ep->max_tx_queue_depth = 0;440		ep->eid = i;441		ep->htc = htc;442		ep->tx_credit_flow_enabled = true;443	}444}445 446static u8 ath12k_htc_get_credit_allocation(struct ath12k_htc *htc,447					   u16 service_id)448{449	struct ath12k_htc_svc_tx_credits *serv_entry;450	u8 i, allocation = 0;451 452	serv_entry = htc->service_alloc_table;453 454	for (i = 0; i < ATH12K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) {455		if (serv_entry[i].service_id == service_id) {456			allocation = serv_entry[i].credit_allocation;457			break;458		}459	}460 461	return allocation;462}463 464static int ath12k_htc_setup_target_buffer_assignments(struct ath12k_htc *htc)465{466	struct ath12k_htc_svc_tx_credits *serv_entry;467	static const u32 svc_id[] = {468					ATH12K_HTC_SVC_ID_WMI_CONTROL,469					ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1,470					ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2,471				};472	int i, credits;473 474	credits = htc->total_transmit_credits;475	serv_entry = htc->service_alloc_table;476 477	if ((htc->wmi_ep_count == 0) ||478	    (htc->wmi_ep_count > ARRAY_SIZE(svc_id)))479		return -EINVAL;480 481	/* Divide credits among number of endpoints for WMI */482	credits = credits / htc->wmi_ep_count;483	for (i = 0; i < htc->wmi_ep_count; i++) {484		serv_entry[i].service_id = svc_id[i];485		serv_entry[i].credit_allocation = credits;486	}487 488	return 0;489}490 491int ath12k_htc_wait_target(struct ath12k_htc *htc)492{493	int i, status = 0;494	struct ath12k_base *ab = htc->ab;495	unsigned long time_left;496	struct ath12k_htc_ready *ready;497	u16 message_id;498	u16 credit_count;499	u16 credit_size;500 501	time_left = wait_for_completion_timeout(&htc->ctl_resp,502						ATH12K_HTC_WAIT_TIMEOUT_HZ);503	if (!time_left) {504		ath12k_warn(ab, "failed to receive control response completion, polling..\n");505 506		for (i = 0; i < ab->hw_params->ce_count; i++)507			ath12k_ce_per_engine_service(htc->ab, i);508 509		time_left =510			wait_for_completion_timeout(&htc->ctl_resp,511						    ATH12K_HTC_WAIT_TIMEOUT_HZ);512 513		if (!time_left)514			status = -ETIMEDOUT;515	}516 517	if (status < 0) {518		ath12k_warn(ab, "ctl_resp never came in (%d)\n", status);519		return status;520	}521 522	if (htc->control_resp_len < sizeof(*ready)) {523		ath12k_warn(ab, "Invalid HTC ready msg len:%d\n",524			    htc->control_resp_len);525		return -ECOMM;526	}527 528	ready = (struct ath12k_htc_ready *)htc->control_resp_buffer;529	message_id = le32_get_bits(ready->id_credit_count, HTC_MSG_MESSAGEID);530	credit_count = le32_get_bits(ready->id_credit_count,531				     HTC_READY_MSG_CREDITCOUNT);532	credit_size = le32_get_bits(ready->size_ep, HTC_READY_MSG_CREDITSIZE);533 534	if (message_id != ATH12K_HTC_MSG_READY_ID) {535		ath12k_warn(ab, "Invalid HTC ready msg: 0x%x\n", message_id);536		return -ECOMM;537	}538 539	htc->total_transmit_credits = credit_count;540	htc->target_credit_size = credit_size;541 542	ath12k_dbg(ab, ATH12K_DBG_HTC,543		   "Target ready! transmit resources: %d size:%d\n",544		   htc->total_transmit_credits, htc->target_credit_size);545 546	if ((htc->total_transmit_credits == 0) ||547	    (htc->target_credit_size == 0)) {548		ath12k_warn(ab, "Invalid credit size received\n");549		return -ECOMM;550	}551 552	ath12k_htc_setup_target_buffer_assignments(htc);553 554	return 0;555}556 557int ath12k_htc_connect_service(struct ath12k_htc *htc,558			       struct ath12k_htc_svc_conn_req *conn_req,559			       struct ath12k_htc_svc_conn_resp *conn_resp)560{561	struct ath12k_base *ab = htc->ab;562	struct ath12k_htc_conn_svc *req_msg;563	struct ath12k_htc_conn_svc_resp resp_msg_dummy;564	struct ath12k_htc_conn_svc_resp *resp_msg = &resp_msg_dummy;565	enum ath12k_htc_ep_id assigned_eid = ATH12K_HTC_EP_COUNT;566	struct ath12k_htc_ep *ep;567	struct sk_buff *skb;568	unsigned int max_msg_size = 0;569	int length, status;570	unsigned long time_left;571	bool disable_credit_flow_ctrl = false;572	u16 message_id, service_id, flags = 0;573	u8 tx_alloc = 0;574 575	/* special case for HTC pseudo control service */576	if (conn_req->service_id == ATH12K_HTC_SVC_ID_RSVD_CTRL) {577		disable_credit_flow_ctrl = true;578		assigned_eid = ATH12K_HTC_EP_0;579		max_msg_size = ATH12K_HTC_MAX_CTRL_MSG_LEN;580		memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy));581		goto setup;582	}583 584	tx_alloc = ath12k_htc_get_credit_allocation(htc,585						    conn_req->service_id);586	if (!tx_alloc)587		ath12k_dbg(ab, ATH12K_DBG_BOOT,588			   "boot htc service %s does not allocate target credits\n",589			   htc_service_name(conn_req->service_id));590 591	skb = ath12k_htc_build_tx_ctrl_skb();592	if (!skb) {593		ath12k_warn(ab, "Failed to allocate HTC packet\n");594		return -ENOMEM;595	}596 597	length = sizeof(*req_msg);598	skb_put(skb, length);599	memset(skb->data, 0, length);600 601	req_msg = (struct ath12k_htc_conn_svc *)skb->data;602	req_msg->msg_svc_id = le32_encode_bits(ATH12K_HTC_MSG_CONNECT_SERVICE_ID,603					       HTC_MSG_MESSAGEID);604 605	flags |= u32_encode_bits(tx_alloc, ATH12K_HTC_CONN_FLAGS_RECV_ALLOC);606 607	/* Only enable credit flow control for WMI ctrl service */608	if (!(conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL ||609	      conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1 ||610	      conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2)) {611		flags |= ATH12K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL;612		disable_credit_flow_ctrl = true;613	}614 615	req_msg->flags_len = le32_encode_bits(flags, HTC_SVC_MSG_CONNECTIONFLAGS);616	req_msg->msg_svc_id |= le32_encode_bits(conn_req->service_id,617						HTC_SVC_MSG_SERVICE_ID);618 619	reinit_completion(&htc->ctl_resp);620 621	status = ath12k_htc_send(htc, ATH12K_HTC_EP_0, skb);622	if (status) {623		kfree_skb(skb);624		return status;625	}626 627	/* wait for response */628	time_left = wait_for_completion_timeout(&htc->ctl_resp,629						ATH12K_HTC_CONN_SVC_TIMEOUT_HZ);630	if (!time_left) {631		ath12k_err(ab, "Service connect timeout\n");632		return -ETIMEDOUT;633	}634 635	/* we controlled the buffer creation, it's aligned */636	resp_msg = (struct ath12k_htc_conn_svc_resp *)htc->control_resp_buffer;637	message_id = le32_get_bits(resp_msg->msg_svc_id, HTC_MSG_MESSAGEID);638	service_id = le32_get_bits(resp_msg->msg_svc_id,639				   HTC_SVC_RESP_MSG_SERVICEID);640 641	if ((message_id != ATH12K_HTC_MSG_CONNECT_SERVICE_RESP_ID) ||642	    (htc->control_resp_len < sizeof(*resp_msg))) {643		ath12k_err(ab, "Invalid resp message ID 0x%x", message_id);644		return -EPROTO;645	}646 647	ath12k_dbg(ab, ATH12K_DBG_HTC,648		   "HTC Service %s connect response: status: %u, assigned ep: %u\n",649		   htc_service_name(service_id),650		   le32_get_bits(resp_msg->flags_len, HTC_SVC_RESP_MSG_STATUS),651		   le32_get_bits(resp_msg->flags_len, HTC_SVC_RESP_MSG_ENDPOINTID));652 653	conn_resp->connect_resp_code = le32_get_bits(resp_msg->flags_len,654						     HTC_SVC_RESP_MSG_STATUS);655 656	/* check response status */657	if (conn_resp->connect_resp_code != ATH12K_HTC_CONN_SVC_STATUS_SUCCESS) {658		ath12k_err(ab, "HTC Service %s connect request failed: 0x%x)\n",659			   htc_service_name(service_id),660		       conn_resp->connect_resp_code);661		return -EPROTO;662	}663 664	assigned_eid = le32_get_bits(resp_msg->flags_len,665				     HTC_SVC_RESP_MSG_ENDPOINTID);666 667	max_msg_size = le32_get_bits(resp_msg->flags_len,668				     HTC_SVC_RESP_MSG_MAXMSGSIZE);669 670setup:671 672	if (assigned_eid >= ATH12K_HTC_EP_COUNT)673		return -EPROTO;674 675	if (max_msg_size == 0)676		return -EPROTO;677 678	ep = &htc->endpoint[assigned_eid];679	ep->eid = assigned_eid;680 681	if (ep->service_id != ATH12K_HTC_SVC_ID_UNUSED)682		return -EPROTO;683 684	/* return assigned endpoint to caller */685	conn_resp->eid = assigned_eid;686	conn_resp->max_msg_len = le32_get_bits(resp_msg->flags_len,687					       HTC_SVC_RESP_MSG_MAXMSGSIZE);688 689	/* setup the endpoint */690	ep->service_id = conn_req->service_id;691	ep->max_tx_queue_depth = conn_req->max_send_queue_depth;692	ep->max_ep_message_len = le32_get_bits(resp_msg->flags_len,693					       HTC_SVC_RESP_MSG_MAXMSGSIZE);694	ep->tx_credits = tx_alloc;695 696	/* copy all the callbacks */697	ep->ep_ops = conn_req->ep_ops;698 699	status = ath12k_hif_map_service_to_pipe(htc->ab,700						ep->service_id,701						&ep->ul_pipe_id,702						&ep->dl_pipe_id);703	if (status)704		return status;705 706	ath12k_dbg(ab, ATH12K_DBG_BOOT,707		   "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n",708		   htc_service_name(ep->service_id), ep->ul_pipe_id,709		   ep->dl_pipe_id, ep->eid);710 711	if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) {712		ep->tx_credit_flow_enabled = false;713		ath12k_dbg(ab, ATH12K_DBG_BOOT,714			   "boot htc service '%s' eid %d TX flow control disabled\n",715			   htc_service_name(ep->service_id), assigned_eid);716	}717 718	return status;719}720 721int ath12k_htc_start(struct ath12k_htc *htc)722{723	struct sk_buff *skb;724	int status;725	struct ath12k_base *ab = htc->ab;726	struct ath12k_htc_setup_complete_extended *msg;727 728	skb = ath12k_htc_build_tx_ctrl_skb();729	if (!skb)730		return -ENOMEM;731 732	skb_put(skb, sizeof(*msg));733	memset(skb->data, 0, skb->len);734 735	msg = (struct ath12k_htc_setup_complete_extended *)skb->data;736	msg->msg_id = le32_encode_bits(ATH12K_HTC_MSG_SETUP_COMPLETE_EX_ID,737				       HTC_MSG_MESSAGEID);738 739	ath12k_dbg(ab, ATH12K_DBG_HTC, "HTC is using TX credit flow control\n");740 741	status = ath12k_htc_send(htc, ATH12K_HTC_EP_0, skb);742	if (status) {743		kfree_skb(skb);744		return status;745	}746 747	return 0;748}749 750int ath12k_htc_init(struct ath12k_base *ab)751{752	struct ath12k_htc *htc = &ab->htc;753	struct ath12k_htc_svc_conn_req conn_req = { };754	struct ath12k_htc_svc_conn_resp conn_resp = { };755	int ret;756 757	spin_lock_init(&htc->tx_lock);758 759	ath12k_htc_reset_endpoint_states(htc);760 761	htc->ab = ab;762 763	switch (ab->wmi_ab.preferred_hw_mode) {764	case WMI_HOST_HW_MODE_SINGLE:765		htc->wmi_ep_count = 1;766		break;767	case WMI_HOST_HW_MODE_DBS:768	case WMI_HOST_HW_MODE_DBS_OR_SBS:769		htc->wmi_ep_count = 2;770		break;771	case WMI_HOST_HW_MODE_DBS_SBS:772		htc->wmi_ep_count = 3;773		break;774	default:775		htc->wmi_ep_count = ab->hw_params->max_radios;776		break;777	}778 779	/* setup our pseudo HTC control endpoint connection */780	conn_req.ep_ops.ep_tx_complete = ath12k_htc_control_tx_complete;781	conn_req.ep_ops.ep_rx_complete = ath12k_htc_control_rx_complete;782	conn_req.max_send_queue_depth = ATH12K_NUM_CONTROL_TX_BUFFERS;783	conn_req.service_id = ATH12K_HTC_SVC_ID_RSVD_CTRL;784 785	/* connect fake service */786	ret = ath12k_htc_connect_service(htc, &conn_req, &conn_resp);787	if (ret) {788		ath12k_err(ab, "could not connect to htc service (%d)\n", ret);789		return ret;790	}791 792	init_completion(&htc->ctl_resp);793 794	return 0;795}796