[PATCH 27/50] wifi: ath12k: add htc.c

Kalle Valo
2022-08-12T16:09:40Z

From: Kalle Valo <quic_kvalo@quicinc.com>

(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 <quic_kvalo@quicinc.com>
---
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..4ac320a2a303
--- /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 <linux/skbuff.h>
+#include <linux/ctype.h>
+
+#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 *ab)
+{
+ 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));
+
+ ath12k_dbg(ab, ATH12K_DBG_HTC, "%s: skb %pK\n", __func__, skb);
+ 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)
+{
+ u8 i, allocation = 0;
+
+ for (i = 0; i < ATH12K_HTC_MAX_SERVICE_ALLOC_ENTRIES; i++) {
+ if (htc->service_alloc_table[i].service_id == service_id) {
+ allocation =
+ htc->service_alloc_table[i].credit_allocation;
+ }
+ }
+
+ return allocation;
+}
+
+static int ath12k_htc_setup_target_buffer_assignments(struct ath12k_htc *htc)
+{
+ struct ath12k_htc_svc_tx_credits *serv_entry;
+ 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(htc->ab);
+ 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 = 0;
+ struct ath12k_base *ab = htc->ab;
+ struct ath12k_htc_setup_complete_extended *msg;
+
+ skb = ath12k_htc_build_tx_ctrl_skb(htc->ab);
+ 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 */
+ memset(&conn_req, 0, sizeof(conn_req));
+ memset(&conn_resp, 0, sizeof(conn_resp));
+ 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;
+}