From patchwork Wed Nov 16 16:38:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kalle Valo X-Patchwork-Id: 625441 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6B62BC433FE for ; Wed, 16 Nov 2022 16:44:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239116AbiKPQoJ (ORCPT ); Wed, 16 Nov 2022 11:44:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55556 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234812AbiKPQn0 (ORCPT ); Wed, 16 Nov 2022 11:43:26 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E60511B79E for ; Wed, 16 Nov 2022 08:39:38 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 751EFB81DBF for ; Wed, 16 Nov 2022 16:39:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C1BCC433D6; Wed, 16 Nov 2022 16:39:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668616776; bh=excp1P1vl6DGnUv45SpLm9IY1G4XKC+7oO5uBiV7JFU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JFIlisCzr2uom6lz7VAmDsFpGTdNI8LIOVcnE6ZYLWvXVIyYbt68fb41pAlmGgZdH nbk2CnFgZfRNOFQnYDF+xGMrG1J/u+KbkoyT+7G1h9qrFpFluqdBbe9dgMI0Cwdr9L QYzKcxZv6BW2Y79brI/9MzkIiv2Gq4CMSwhY5ZUn5F5rcmhqTOfDEXvKmpFMd49bE1 KkOGYV9Z47Yl+0kCxqAEIF5QFnsoQ10v/Ju00Ro3fz+TbriLVo1gSOSHNCIzpAXhP6 J/HW9yxbw0na5NLhXht3kbkNCfgkoIfswowxA5n/5SKsVbrI3K9j0bTokoACazgOJX FwQFHc+4mJ0bQ== From: Kalle Valo To: linux-wireless@vger.kernel.org Cc: ath12k@lists.infradead.org Subject: [PATCH v2 27/50] wifi: ath12k: add htc.c Date: Wed, 16 Nov 2022 18:38:39 +0200 Message-Id: <20221116163902.24996-28-kvalo@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221116163902.24996-1-kvalo@kernel.org> References: <20221116163902.24996-1-kvalo@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Kalle Valo (Patches split into one patch per file for easier review, but the final commit will be one big patch. See the cover letter for more info.) Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath12k/htc.c | 789 ++++++++++++++++++++++++++++++++++ 1 file changed, 789 insertions(+) diff --git a/drivers/net/wireless/ath/ath12k/htc.c b/drivers/net/wireless/ath/ath12k/htc.c new file mode 100644 index 000000000000..23f7428abd95 --- /dev/null +++ b/drivers/net/wireless/ath/ath12k/htc.c @@ -0,0 +1,789 @@ +// SPDX-License-Identifier: BSD-3-Clause-Clear +/* + * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved. + * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ +#include +#include + +#include "debug.h" +#include "hif.h" + +struct sk_buff *ath12k_htc_alloc_skb(struct ath12k_base *ab, int size) +{ + struct sk_buff *skb; + + skb = dev_alloc_skb(size + sizeof(struct ath12k_htc_hdr)); + if (!skb) + return NULL; + + skb_reserve(skb, sizeof(struct ath12k_htc_hdr)); + + /* FW/HTC requires 4-byte aligned streams */ + if (!IS_ALIGNED((unsigned long)skb->data, 4)) + ath12k_warn(ab, "Unaligned HTC tx skb\n"); + + return skb; +} + +static void ath12k_htc_control_tx_complete(struct ath12k_base *ab, + struct sk_buff *skb) +{ + kfree_skb(skb); +} + +static struct sk_buff *ath12k_htc_build_tx_ctrl_skb(void) +{ + struct sk_buff *skb; + struct ath12k_skb_cb *skb_cb; + + skb = dev_alloc_skb(ATH12K_HTC_CONTROL_BUFFER_SIZE); + if (!skb) + return NULL; + + skb_reserve(skb, sizeof(struct ath12k_htc_hdr)); + WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4)); + + skb_cb = ATH12K_SKB_CB(skb); + memset(skb_cb, 0, sizeof(*skb_cb)); + + return skb; +} + +static void ath12k_htc_prepare_tx_skb(struct ath12k_htc_ep *ep, + struct sk_buff *skb) +{ + struct ath12k_htc_hdr *hdr; + + hdr = (struct ath12k_htc_hdr *)skb->data; + + memset(hdr, 0, sizeof(*hdr)); + hdr->htc_info = le32_encode_bits(ep->eid, HTC_HDR_ENDPOINTID) | + le32_encode_bits((skb->len - sizeof(*hdr)), + HTC_HDR_PAYLOADLEN); + + if (ep->tx_credit_flow_enabled) + hdr->htc_info |= le32_encode_bits(ATH12K_HTC_FLAG_NEED_CREDIT_UPDATE, + HTC_HDR_FLAGS); + + spin_lock_bh(&ep->htc->tx_lock); + hdr->ctrl_info = le32_encode_bits(ep->seq_no++, HTC_HDR_CONTROLBYTES1); + spin_unlock_bh(&ep->htc->tx_lock); +} + +int ath12k_htc_send(struct ath12k_htc *htc, + enum ath12k_htc_ep_id eid, + struct sk_buff *skb) +{ + struct ath12k_htc_ep *ep = &htc->endpoint[eid]; + struct ath12k_skb_cb *skb_cb = ATH12K_SKB_CB(skb); + struct device *dev = htc->ab->dev; + struct ath12k_base *ab = htc->ab; + int credits = 0; + int ret; + + if (eid >= ATH12K_HTC_EP_COUNT) { + ath12k_warn(ab, "Invalid endpoint id: %d\n", eid); + return -ENOENT; + } + + skb_push(skb, sizeof(struct ath12k_htc_hdr)); + + if (ep->tx_credit_flow_enabled) { + credits = DIV_ROUND_UP(skb->len, htc->target_credit_size); + spin_lock_bh(&htc->tx_lock); + if (ep->tx_credits < credits) { + ath12k_dbg(ab, ATH12K_DBG_HTC, + "htc insufficient credits ep %d required %d available %d\n", + eid, credits, ep->tx_credits); + spin_unlock_bh(&htc->tx_lock); + ret = -EAGAIN; + goto err_pull; + } + ep->tx_credits -= credits; + ath12k_dbg(ab, ATH12K_DBG_HTC, + "htc ep %d consumed %d credits (total %d)\n", + eid, credits, ep->tx_credits); + spin_unlock_bh(&htc->tx_lock); + } + + ath12k_htc_prepare_tx_skb(ep, skb); + + skb_cb->paddr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE); + ret = dma_mapping_error(dev, skb_cb->paddr); + if (ret) { + ret = -EIO; + goto err_credits; + } + + ret = ath12k_ce_send(htc->ab, skb, ep->ul_pipe_id, ep->eid); + if (ret) + goto err_unmap; + + return 0; + +err_unmap: + dma_unmap_single(dev, skb_cb->paddr, skb->len, DMA_TO_DEVICE); +err_credits: + if (ep->tx_credit_flow_enabled) { + spin_lock_bh(&htc->tx_lock); + ep->tx_credits += credits; + ath12k_dbg(ab, ATH12K_DBG_HTC, + "htc ep %d reverted %d credits back (total %d)\n", + eid, credits, ep->tx_credits); + spin_unlock_bh(&htc->tx_lock); + + if (ep->ep_ops.ep_tx_credits) + ep->ep_ops.ep_tx_credits(htc->ab); + } +err_pull: + skb_pull(skb, sizeof(struct ath12k_htc_hdr)); + return ret; +} + +static void +ath12k_htc_process_credit_report(struct ath12k_htc *htc, + const struct ath12k_htc_credit_report *report, + int len, + enum ath12k_htc_ep_id eid) +{ + struct ath12k_base *ab = htc->ab; + struct ath12k_htc_ep *ep; + int i, n_reports; + + if (len % sizeof(*report)) + ath12k_warn(ab, "Uneven credit report len %d", len); + + n_reports = len / sizeof(*report); + + spin_lock_bh(&htc->tx_lock); + for (i = 0; i < n_reports; i++, report++) { + if (report->eid >= ATH12K_HTC_EP_COUNT) + break; + + ep = &htc->endpoint[report->eid]; + ep->tx_credits += report->credits; + + ath12k_dbg(ab, ATH12K_DBG_HTC, "htc ep %d got %d credits (total %d)\n", + report->eid, report->credits, ep->tx_credits); + + if (ep->ep_ops.ep_tx_credits) { + spin_unlock_bh(&htc->tx_lock); + ep->ep_ops.ep_tx_credits(htc->ab); + spin_lock_bh(&htc->tx_lock); + } + } + spin_unlock_bh(&htc->tx_lock); +} + +static int ath12k_htc_process_trailer(struct ath12k_htc *htc, + u8 *buffer, + int length, + enum ath12k_htc_ep_id src_eid) +{ + struct ath12k_base *ab = htc->ab; + int status = 0; + struct ath12k_htc_record *record; + size_t len; + + while (length > 0) { + record = (struct ath12k_htc_record *)buffer; + + if (length < sizeof(record->hdr)) { + status = -EINVAL; + break; + } + + if (record->hdr.len > length) { + /* no room left in buffer for record */ + ath12k_warn(ab, "Invalid record length: %d\n", + record->hdr.len); + status = -EINVAL; + break; + } + + switch (record->hdr.id) { + case ATH12K_HTC_RECORD_CREDITS: + len = sizeof(struct ath12k_htc_credit_report); + if (record->hdr.len < len) { + ath12k_warn(ab, "Credit report too long\n"); + status = -EINVAL; + break; + } + ath12k_htc_process_credit_report(htc, + record->credit_report, + record->hdr.len, + src_eid); + break; + default: + ath12k_warn(ab, "Unhandled record: id:%d length:%d\n", + record->hdr.id, record->hdr.len); + break; + } + + if (status) + break; + + /* multiple records may be present in a trailer */ + buffer += sizeof(record->hdr) + record->hdr.len; + length -= sizeof(record->hdr) + record->hdr.len; + } + + return status; +} + +static void ath12k_htc_suspend_complete(struct ath12k_base *ab, bool ack) +{ + ath12k_dbg(ab, ATH12K_DBG_BOOT, "boot suspend complete %d\n", ack); + + if (ack) + set_bit(ATH12K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags); + else + clear_bit(ATH12K_FLAG_HTC_SUSPEND_COMPLETE, &ab->dev_flags); + + complete(&ab->htc_suspend); +} + +void ath12k_htc_rx_completion_handler(struct ath12k_base *ab, + struct sk_buff *skb) +{ + int status = 0; + struct ath12k_htc *htc = &ab->htc; + struct ath12k_htc_hdr *hdr; + struct ath12k_htc_ep *ep; + u16 payload_len; + u32 trailer_len = 0; + size_t min_len; + u8 eid; + bool trailer_present; + + hdr = (struct ath12k_htc_hdr *)skb->data; + skb_pull(skb, sizeof(*hdr)); + + eid = le32_get_bits(hdr->htc_info, HTC_HDR_ENDPOINTID); + + if (eid >= ATH12K_HTC_EP_COUNT) { + ath12k_warn(ab, "HTC Rx: invalid eid %d\n", eid); + goto out; + } + + ep = &htc->endpoint[eid]; + + payload_len = le32_get_bits(hdr->htc_info, HTC_HDR_PAYLOADLEN); + + if (payload_len + sizeof(*hdr) > ATH12K_HTC_MAX_LEN) { + ath12k_warn(ab, "HTC rx frame too long, len: %zu\n", + payload_len + sizeof(*hdr)); + goto out; + } + + if (skb->len < payload_len) { + ath12k_warn(ab, "HTC Rx: insufficient length, got %d, expected %d\n", + skb->len, payload_len); + goto out; + } + + /* get flags to check for trailer */ + trailer_present = le32_get_bits(hdr->htc_info, HTC_HDR_FLAGS) & + ATH12K_HTC_FLAG_TRAILER_PRESENT; + + if (trailer_present) { + u8 *trailer; + + trailer_len = le32_get_bits(hdr->ctrl_info, + HTC_HDR_CONTROLBYTES0); + min_len = sizeof(struct ath12k_htc_record_hdr); + + if ((trailer_len < min_len) || + (trailer_len > payload_len)) { + ath12k_warn(ab, "Invalid trailer length: %d\n", + trailer_len); + goto out; + } + + trailer = (u8 *)hdr; + trailer += sizeof(*hdr); + trailer += payload_len; + trailer -= trailer_len; + status = ath12k_htc_process_trailer(htc, trailer, + trailer_len, eid); + if (status) + goto out; + + skb_trim(skb, skb->len - trailer_len); + } + + if (trailer_len >= payload_len) + /* zero length packet with trailer data, just drop these */ + goto out; + + if (eid == ATH12K_HTC_EP_0) { + struct ath12k_htc_msg *msg = (struct ath12k_htc_msg *)skb->data; + + switch (le32_get_bits(msg->msg_svc_id, HTC_MSG_MESSAGEID)) { + case ATH12K_HTC_MSG_READY_ID: + case ATH12K_HTC_MSG_CONNECT_SERVICE_RESP_ID: + /* handle HTC control message */ + if (completion_done(&htc->ctl_resp)) { + /* this is a fatal error, target should not be + * sending unsolicited messages on the ep 0 + */ + ath12k_warn(ab, "HTC rx ctrl still processing\n"); + complete(&htc->ctl_resp); + goto out; + } + + htc->control_resp_len = + min_t(int, skb->len, + ATH12K_HTC_MAX_CTRL_MSG_LEN); + + memcpy(htc->control_resp_buffer, skb->data, + htc->control_resp_len); + + complete(&htc->ctl_resp); + break; + case ATH12K_HTC_MSG_SEND_SUSPEND_COMPLETE: + ath12k_htc_suspend_complete(ab, true); + break; + case ATH12K_HTC_MSG_NACK_SUSPEND: + ath12k_htc_suspend_complete(ab, false); + break; + case ATH12K_HTC_MSG_WAKEUP_FROM_SUSPEND_ID: + break; + default: + ath12k_warn(ab, "ignoring unsolicited htc ep0 event %u\n", + le32_get_bits(msg->msg_svc_id, HTC_MSG_MESSAGEID)); + break; + } + goto out; + } + + ath12k_dbg(ab, ATH12K_DBG_HTC, "htc rx completion ep %d skb %pK\n", + eid, skb); + ep->ep_ops.ep_rx_complete(ab, skb); + + /* poll tx completion for interrupt disabled CE's */ + ath12k_ce_poll_send_completed(ab, ep->ul_pipe_id); + + /* skb is now owned by the rx completion handler */ + skb = NULL; +out: + kfree_skb(skb); +} + +static void ath12k_htc_control_rx_complete(struct ath12k_base *ab, + struct sk_buff *skb) +{ + /* This is unexpected. FW is not supposed to send regular rx on this + * endpoint. + */ + ath12k_warn(ab, "unexpected htc rx\n"); + kfree_skb(skb); +} + +static const char *htc_service_name(enum ath12k_htc_svc_id id) +{ + switch (id) { + case ATH12K_HTC_SVC_ID_RESERVED: + return "Reserved"; + case ATH12K_HTC_SVC_ID_RSVD_CTRL: + return "Control"; + case ATH12K_HTC_SVC_ID_WMI_CONTROL: + return "WMI"; + case ATH12K_HTC_SVC_ID_WMI_DATA_BE: + return "DATA BE"; + case ATH12K_HTC_SVC_ID_WMI_DATA_BK: + return "DATA BK"; + case ATH12K_HTC_SVC_ID_WMI_DATA_VI: + return "DATA VI"; + case ATH12K_HTC_SVC_ID_WMI_DATA_VO: + return "DATA VO"; + case ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1: + return "WMI MAC1"; + case ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2: + return "WMI MAC2"; + case ATH12K_HTC_SVC_ID_NMI_CONTROL: + return "NMI Control"; + case ATH12K_HTC_SVC_ID_NMI_DATA: + return "NMI Data"; + case ATH12K_HTC_SVC_ID_HTT_DATA_MSG: + return "HTT Data"; + case ATH12K_HTC_SVC_ID_TEST_RAW_STREAMS: + return "RAW"; + case ATH12K_HTC_SVC_ID_IPA_TX: + return "IPA TX"; + case ATH12K_HTC_SVC_ID_PKT_LOG: + return "PKT LOG"; + case ATH12K_HTC_SVC_ID_WMI_CONTROL_DIAG: + return "WMI DIAG"; + } + + return "Unknown"; +} + +static void ath12k_htc_reset_endpoint_states(struct ath12k_htc *htc) +{ + struct ath12k_htc_ep *ep; + int i; + + for (i = ATH12K_HTC_EP_0; i < ATH12K_HTC_EP_COUNT; i++) { + ep = &htc->endpoint[i]; + ep->service_id = ATH12K_HTC_SVC_ID_UNUSED; + ep->max_ep_message_len = 0; + ep->max_tx_queue_depth = 0; + ep->eid = i; + ep->htc = htc; + ep->tx_credit_flow_enabled = true; + } +} + +static u8 ath12k_htc_get_credit_allocation(struct ath12k_htc *htc, + u16 service_id) +{ + struct ath12k_htc_svc_tx_credits *serv_entry; + u8 i, allocation = 0; + + serv_entry = htc->service_alloc_table; + + for (i = 0; i < ATH12K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) { + if (serv_entry[i].service_id == service_id) { + allocation = serv_entry[i].credit_allocation; + break; + } + } + + return allocation; +} + +static int ath12k_htc_setup_target_buffer_assignments(struct ath12k_htc *htc) +{ + struct ath12k_htc_svc_tx_credits *serv_entry; + static const u32 svc_id[] = { + ATH12K_HTC_SVC_ID_WMI_CONTROL, + ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1, + ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2, + }; + int i, credits; + + credits = htc->total_transmit_credits; + serv_entry = htc->service_alloc_table; + + if ((htc->wmi_ep_count == 0) || + (htc->wmi_ep_count > ARRAY_SIZE(svc_id))) + return -EINVAL; + + /* Divide credits among number of endpoints for WMI */ + credits = credits / htc->wmi_ep_count; + for (i = 0; i < htc->wmi_ep_count; i++) { + serv_entry[i].service_id = svc_id[i]; + serv_entry[i].credit_allocation = credits; + } + + return 0; +} + +int ath12k_htc_wait_target(struct ath12k_htc *htc) +{ + int i, status = 0; + struct ath12k_base *ab = htc->ab; + unsigned long time_left; + struct ath12k_htc_ready *ready; + u16 message_id; + u16 credit_count; + u16 credit_size; + + time_left = wait_for_completion_timeout(&htc->ctl_resp, + ATH12K_HTC_WAIT_TIMEOUT_HZ); + if (!time_left) { + ath12k_warn(ab, "failed to receive control response completion, polling..\n"); + + for (i = 0; i < ab->hw_params->ce_count; i++) + ath12k_ce_per_engine_service(htc->ab, i); + + time_left = + wait_for_completion_timeout(&htc->ctl_resp, + ATH12K_HTC_WAIT_TIMEOUT_HZ); + + if (!time_left) + status = -ETIMEDOUT; + } + + if (status < 0) { + ath12k_warn(ab, "ctl_resp never came in (%d)\n", status); + return status; + } + + if (htc->control_resp_len < sizeof(*ready)) { + ath12k_warn(ab, "Invalid HTC ready msg len:%d\n", + htc->control_resp_len); + return -ECOMM; + } + + ready = (struct ath12k_htc_ready *)htc->control_resp_buffer; + message_id = le32_get_bits(ready->id_credit_count, HTC_MSG_MESSAGEID); + credit_count = le32_get_bits(ready->id_credit_count, + HTC_READY_MSG_CREDITCOUNT); + credit_size = le32_get_bits(ready->size_ep, HTC_READY_MSG_CREDITSIZE); + + if (message_id != ATH12K_HTC_MSG_READY_ID) { + ath12k_warn(ab, "Invalid HTC ready msg: 0x%x\n", message_id); + return -ECOMM; + } + + htc->total_transmit_credits = credit_count; + htc->target_credit_size = credit_size; + + ath12k_dbg(ab, ATH12K_DBG_HTC, + "Target ready! transmit resources: %d size:%d\n", + htc->total_transmit_credits, htc->target_credit_size); + + if ((htc->total_transmit_credits == 0) || + (htc->target_credit_size == 0)) { + ath12k_warn(ab, "Invalid credit size received\n"); + return -ECOMM; + } + + ath12k_htc_setup_target_buffer_assignments(htc); + + return 0; +} + +int ath12k_htc_connect_service(struct ath12k_htc *htc, + struct ath12k_htc_svc_conn_req *conn_req, + struct ath12k_htc_svc_conn_resp *conn_resp) +{ + struct ath12k_base *ab = htc->ab; + struct ath12k_htc_conn_svc *req_msg; + struct ath12k_htc_conn_svc_resp resp_msg_dummy; + struct ath12k_htc_conn_svc_resp *resp_msg = &resp_msg_dummy; + enum ath12k_htc_ep_id assigned_eid = ATH12K_HTC_EP_COUNT; + struct ath12k_htc_ep *ep; + struct sk_buff *skb; + unsigned int max_msg_size = 0; + int length, status; + unsigned long time_left; + bool disable_credit_flow_ctrl = false; + u16 message_id, service_id, flags = 0; + u8 tx_alloc = 0; + + /* special case for HTC pseudo control service */ + if (conn_req->service_id == ATH12K_HTC_SVC_ID_RSVD_CTRL) { + disable_credit_flow_ctrl = true; + assigned_eid = ATH12K_HTC_EP_0; + max_msg_size = ATH12K_HTC_MAX_CTRL_MSG_LEN; + memset(&resp_msg_dummy, 0, sizeof(resp_msg_dummy)); + goto setup; + } + + tx_alloc = ath12k_htc_get_credit_allocation(htc, + conn_req->service_id); + if (!tx_alloc) + ath12k_dbg(ab, ATH12K_DBG_BOOT, + "boot htc service %s does not allocate target credits\n", + htc_service_name(conn_req->service_id)); + + skb = ath12k_htc_build_tx_ctrl_skb(); + if (!skb) { + ath12k_warn(ab, "Failed to allocate HTC packet\n"); + return -ENOMEM; + } + + length = sizeof(*req_msg); + skb_put(skb, length); + memset(skb->data, 0, length); + + req_msg = (struct ath12k_htc_conn_svc *)skb->data; + req_msg->msg_svc_id = le32_encode_bits(ATH12K_HTC_MSG_CONNECT_SERVICE_ID, + HTC_MSG_MESSAGEID); + + flags |= u32_encode_bits(tx_alloc, ATH12K_HTC_CONN_FLAGS_RECV_ALLOC); + + /* Only enable credit flow control for WMI ctrl service */ + if (!(conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL || + conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1 || + conn_req->service_id == ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2)) { + flags |= ATH12K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL; + disable_credit_flow_ctrl = true; + } + + req_msg->flags_len = le32_encode_bits(flags, HTC_SVC_MSG_CONNECTIONFLAGS); + req_msg->msg_svc_id |= le32_encode_bits(conn_req->service_id, + HTC_SVC_MSG_SERVICE_ID); + + reinit_completion(&htc->ctl_resp); + + status = ath12k_htc_send(htc, ATH12K_HTC_EP_0, skb); + if (status) { + kfree_skb(skb); + return status; + } + + /* wait for response */ + time_left = wait_for_completion_timeout(&htc->ctl_resp, + ATH12K_HTC_CONN_SVC_TIMEOUT_HZ); + if (!time_left) { + ath12k_err(ab, "Service connect timeout\n"); + return -ETIMEDOUT; + } + + /* we controlled the buffer creation, it's aligned */ + resp_msg = (struct ath12k_htc_conn_svc_resp *)htc->control_resp_buffer; + message_id = le32_get_bits(resp_msg->msg_svc_id, HTC_MSG_MESSAGEID); + service_id = le32_get_bits(resp_msg->msg_svc_id, + HTC_SVC_RESP_MSG_SERVICEID); + + if ((message_id != ATH12K_HTC_MSG_CONNECT_SERVICE_RESP_ID) || + (htc->control_resp_len < sizeof(*resp_msg))) { + ath12k_err(ab, "Invalid resp message ID 0x%x", message_id); + return -EPROTO; + } + + ath12k_dbg(ab, ATH12K_DBG_HTC, + "HTC Service %s connect response: status: %u, assigned ep: %u\n", + htc_service_name(service_id), + le32_get_bits(resp_msg->flags_len, HTC_SVC_RESP_MSG_STATUS), + le32_get_bits(resp_msg->flags_len, HTC_SVC_RESP_MSG_ENDPOINTID)); + + conn_resp->connect_resp_code = le32_get_bits(resp_msg->flags_len, + HTC_SVC_RESP_MSG_STATUS); + + /* check response status */ + if (conn_resp->connect_resp_code != ATH12K_HTC_CONN_SVC_STATUS_SUCCESS) { + ath12k_err(ab, "HTC Service %s connect request failed: 0x%x)\n", + htc_service_name(service_id), + conn_resp->connect_resp_code); + return -EPROTO; + } + + assigned_eid = le32_get_bits(resp_msg->flags_len, + HTC_SVC_RESP_MSG_ENDPOINTID); + + max_msg_size = le32_get_bits(resp_msg->flags_len, + HTC_SVC_RESP_MSG_MAXMSGSIZE); + +setup: + + if (assigned_eid >= ATH12K_HTC_EP_COUNT) + return -EPROTO; + + if (max_msg_size == 0) + return -EPROTO; + + ep = &htc->endpoint[assigned_eid]; + ep->eid = assigned_eid; + + if (ep->service_id != ATH12K_HTC_SVC_ID_UNUSED) + return -EPROTO; + + /* return assigned endpoint to caller */ + conn_resp->eid = assigned_eid; + conn_resp->max_msg_len = le32_get_bits(resp_msg->flags_len, + HTC_SVC_RESP_MSG_MAXMSGSIZE); + + /* setup the endpoint */ + ep->service_id = conn_req->service_id; + ep->max_tx_queue_depth = conn_req->max_send_queue_depth; + ep->max_ep_message_len = le32_get_bits(resp_msg->flags_len, + HTC_SVC_RESP_MSG_MAXMSGSIZE); + ep->tx_credits = tx_alloc; + + /* copy all the callbacks */ + ep->ep_ops = conn_req->ep_ops; + + status = ath12k_hif_map_service_to_pipe(htc->ab, + ep->service_id, + &ep->ul_pipe_id, + &ep->dl_pipe_id); + if (status) + return status; + + ath12k_dbg(ab, ATH12K_DBG_BOOT, + "boot htc service '%s' ul pipe %d dl pipe %d eid %d ready\n", + htc_service_name(ep->service_id), ep->ul_pipe_id, + ep->dl_pipe_id, ep->eid); + + if (disable_credit_flow_ctrl && ep->tx_credit_flow_enabled) { + ep->tx_credit_flow_enabled = false; + ath12k_dbg(ab, ATH12K_DBG_BOOT, + "boot htc service '%s' eid %d TX flow control disabled\n", + htc_service_name(ep->service_id), assigned_eid); + } + + return status; +} + +int ath12k_htc_start(struct ath12k_htc *htc) +{ + struct sk_buff *skb; + int status; + struct ath12k_base *ab = htc->ab; + struct ath12k_htc_setup_complete_extended *msg; + + skb = ath12k_htc_build_tx_ctrl_skb(); + if (!skb) + return -ENOMEM; + + skb_put(skb, sizeof(*msg)); + memset(skb->data, 0, skb->len); + + msg = (struct ath12k_htc_setup_complete_extended *)skb->data; + msg->msg_id = le32_encode_bits(ATH12K_HTC_MSG_SETUP_COMPLETE_EX_ID, + HTC_MSG_MESSAGEID); + + ath12k_dbg(ab, ATH12K_DBG_HTC, "HTC is using TX credit flow control\n"); + + status = ath12k_htc_send(htc, ATH12K_HTC_EP_0, skb); + if (status) { + kfree_skb(skb); + return status; + } + + return 0; +} + +int ath12k_htc_init(struct ath12k_base *ab) +{ + struct ath12k_htc *htc = &ab->htc; + struct ath12k_htc_svc_conn_req conn_req = { }; + struct ath12k_htc_svc_conn_resp conn_resp = { }; + int ret; + + spin_lock_init(&htc->tx_lock); + + ath12k_htc_reset_endpoint_states(htc); + + htc->ab = ab; + + switch (ab->wmi_ab.preferred_hw_mode) { + case WMI_HOST_HW_MODE_SINGLE: + htc->wmi_ep_count = 1; + break; + case WMI_HOST_HW_MODE_DBS: + case WMI_HOST_HW_MODE_DBS_OR_SBS: + htc->wmi_ep_count = 2; + break; + case WMI_HOST_HW_MODE_DBS_SBS: + htc->wmi_ep_count = 3; + break; + default: + htc->wmi_ep_count = ab->hw_params->max_radios; + break; + } + + /* setup our pseudo HTC control endpoint connection */ + conn_req.ep_ops.ep_tx_complete = ath12k_htc_control_tx_complete; + conn_req.ep_ops.ep_rx_complete = ath12k_htc_control_rx_complete; + conn_req.max_send_queue_depth = ATH12K_NUM_CONTROL_TX_BUFFERS; + conn_req.service_id = ATH12K_HTC_SVC_ID_RSVD_CTRL; + + /* connect fake service */ + ret = ath12k_htc_connect_service(htc, &conn_req, &conn_resp); + if (ret) { + ath12k_err(ab, "could not connect to htc service (%d)\n", ret); + return ret; + } + + init_completion(&htc->ctl_resp); + + return 0; +}