diff --git a/drivers/net/wireless/ath/ath12k/htc.h b/drivers/net/wireless/ath/ath12k/htc.h
new file mode 100644
index 000000000000..7e3dccc7cc14
--- /dev/null
+++ b/drivers/net/wireless/ath/ath12k/htc.h
@@ -0,0 +1,316 @@
+/* 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.
+ */
+
+#ifndef ATH12K_HTC_H
+#define ATH12K_HTC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/bug.h>
+#include <linux/skbuff.h>
+#include <linux/timer.h>
+
+struct ath12k_base;
+
+#define HTC_HDR_ENDPOINTID                       GENMASK(7, 0)
+#define HTC_HDR_FLAGS                            GENMASK(15, 8)
+#define HTC_HDR_PAYLOADLEN                       GENMASK(31, 16)
+#define HTC_HDR_CONTROLBYTES0                    GENMASK(7, 0)
+#define HTC_HDR_CONTROLBYTES1                    GENMASK(15, 8)
+#define HTC_HDR_RESERVED                         GENMASK(31, 16)
+
+#define HTC_SVC_MSG_SERVICE_ID                   GENMASK(31, 16)
+#define HTC_SVC_MSG_CONNECTIONFLAGS              GENMASK(15, 0)
+#define HTC_SVC_MSG_SERVICEMETALENGTH            GENMASK(23, 16)
+#define HTC_READY_MSG_CREDITCOUNT                GENMASK(31, 16)
+#define HTC_READY_MSG_CREDITSIZE                 GENMASK(15, 0)
+#define HTC_READY_MSG_MAXENDPOINTS               GENMASK(23, 16)
+
+#define HTC_READY_EX_MSG_HTCVERSION              GENMASK(7, 0)
+#define HTC_READY_EX_MSG_MAXMSGSPERHTCBUNDLE     GENMASK(15, 8)
+
+#define HTC_SVC_RESP_MSG_SERVICEID           GENMASK(31, 16)
+#define HTC_SVC_RESP_MSG_STATUS              GENMASK(7, 0)
+#define HTC_SVC_RESP_MSG_ENDPOINTID          GENMASK(15, 8)
+#define HTC_SVC_RESP_MSG_MAXMSGSIZE          GENMASK(31, 16)
+#define HTC_SVC_RESP_MSG_SERVICEMETALENGTH   GENMASK(7, 0)
+
+#define HTC_MSG_MESSAGEID                        GENMASK(15, 0)
+#define HTC_SETUP_COMPLETE_EX_MSG_SETUPFLAGS     GENMASK(31, 0)
+#define HTC_SETUP_COMPLETE_EX_MSG_MAXMSGSPERBUNDLEDRECV      GENMASK(7, 0)
+#define HTC_SETUP_COMPLETE_EX_MSG_RSVD0          GENMASK(15, 8)
+#define HTC_SETUP_COMPLETE_EX_MSG_RSVD1          GENMASK(23, 16)
+#define HTC_SETUP_COMPLETE_EX_MSG_RSVD2          GENMASK(31, 24)
+
+enum ath12k_htc_tx_flags {
+	ATH12K_HTC_FLAG_NEED_CREDIT_UPDATE = 0x01,
+	ATH12K_HTC_FLAG_SEND_BUNDLE        = 0x02
+};
+
+enum ath12k_htc_rx_flags {
+	ATH12K_HTC_FLAG_TRAILER_PRESENT = 0x02,
+	ATH12K_HTC_FLAG_BUNDLE_MASK     = 0xF0
+};
+
+struct ath12k_htc_hdr {
+	__le32 htc_info;
+	__le32 ctrl_info;
+} __packed __aligned(4);
+
+enum ath12k_htc_msg_id {
+	ATH12K_HTC_MSG_READY_ID                = 1,
+	ATH12K_HTC_MSG_CONNECT_SERVICE_ID      = 2,
+	ATH12K_HTC_MSG_CONNECT_SERVICE_RESP_ID = 3,
+	ATH12K_HTC_MSG_SETUP_COMPLETE_ID       = 4,
+	ATH12K_HTC_MSG_SETUP_COMPLETE_EX_ID    = 5,
+	ATH12K_HTC_MSG_SEND_SUSPEND_COMPLETE   = 6,
+	ATH12K_HTC_MSG_NACK_SUSPEND	       = 7,
+	ATH12K_HTC_MSG_WAKEUP_FROM_SUSPEND_ID  = 8,
+};
+
+enum ath12k_htc_version {
+	ATH12K_HTC_VERSION_2P0 = 0x00, /* 2.0 */
+	ATH12K_HTC_VERSION_2P1 = 0x01, /* 2.1 */
+};
+
+enum ath12k_htc_conn_flag_threshold_level {
+	ATH12K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_ONE_FOURTH,
+	ATH12K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_ONE_HALF,
+	ATH12K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_THREE_FOURTHS,
+	ATH12K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_UNITY,
+};
+
+#define ATH12K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_MASK	GENMASK(1, 0)
+#define ATH12K_HTC_CONN_FLAGS_REDUCE_CREDIT_DRIBBLE	BIT(2)
+#define ATH12K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL	BIT(3)
+#define ATH12K_HTC_CONN_FLAGS_RECV_ALLOC		GENMASK(15, 8)
+
+enum ath12k_htc_conn_svc_status {
+	ATH12K_HTC_CONN_SVC_STATUS_SUCCESS      = 0,
+	ATH12K_HTC_CONN_SVC_STATUS_NOT_FOUND    = 1,
+	ATH12K_HTC_CONN_SVC_STATUS_FAILED       = 2,
+	ATH12K_HTC_CONN_SVC_STATUS_NO_RESOURCES = 3,
+	ATH12K_HTC_CONN_SVC_STATUS_NO_MORE_EP   = 4
+};
+
+struct ath12k_htc_ready {
+	__le32 id_credit_count;
+	__le32 size_ep;
+} __packed;
+
+struct ath12k_htc_ready_extended {
+	struct ath12k_htc_ready base;
+	__le32 ver_bundle;
+} __packed;
+
+struct ath12k_htc_conn_svc {
+	__le32 msg_svc_id;
+	__le32 flags_len;
+} __packed;
+
+struct ath12k_htc_conn_svc_resp {
+	__le32 msg_svc_id;
+	__le32 flags_len;
+	__le32 svc_meta_pad;
+} __packed;
+
+struct ath12k_htc_setup_complete_extended {
+	__le32 msg_id;
+	__le32 flags;
+	__le32 max_msgs_per_bundled_recv;
+} __packed;
+
+struct ath12k_htc_msg {
+	__le32 msg_svc_id;
+	__le32 flags_len;
+} __packed __aligned(4);
+
+enum ath12k_htc_record_id {
+	ATH12K_HTC_RECORD_NULL    = 0,
+	ATH12K_HTC_RECORD_CREDITS = 1
+};
+
+struct ath12k_htc_record_hdr {
+	u8 id; /* @enum ath12k_htc_record_id */
+	u8 len;
+	u8 pad0;
+	u8 pad1;
+} __packed;
+
+struct ath12k_htc_credit_report {
+	u8 eid; /* @enum ath12k_htc_ep_id */
+	u8 credits;
+	u8 pad0;
+	u8 pad1;
+} __packed;
+
+struct ath12k_htc_record {
+	struct ath12k_htc_record_hdr hdr;
+	struct ath12k_htc_credit_report credit_report[];
+} __packed __aligned(4);
+
+/* HTC FRAME structure layout draft
+ *
+ * note: the trailer offset is dynamic depending
+ * on payload length. this is only a struct layout draft
+ *
+ *=======================================================
+ *
+ *                 HTC HEADER
+ *
+ *=======================================================
+ *                      |
+ *      HTC message     |        payload
+ *   (variable length)  |    (variable length)
+ *=======================================================
+ *
+ *                  HTC Record
+ *
+ *=======================================================
+ */
+
+enum ath12k_htc_svc_gid {
+	ATH12K_HTC_SVC_GRP_RSVD = 0,
+	ATH12K_HTC_SVC_GRP_WMI = 1,
+	ATH12K_HTC_SVC_GRP_NMI = 2,
+	ATH12K_HTC_SVC_GRP_HTT = 3,
+	ATH12K_HTC_SVC_GRP_CFG = 4,
+	ATH12K_HTC_SVC_GRP_IPA = 5,
+	ATH12K_HTC_SVC_GRP_PKTLOG = 6,
+
+	ATH12K_HTC_SVC_GRP_TEST = 254,
+	ATH12K_HTC_SVC_GRP_LAST = 255,
+};
+
+#define SVC(group, idx) \
+	(int)(((int)(group) << 8) | (int)(idx))
+
+enum ath12k_htc_svc_id {
+	/* NOTE: service ID of 0x0000 is reserved and should never be used */
+	ATH12K_HTC_SVC_ID_RESERVED	= 0x0000,
+	ATH12K_HTC_SVC_ID_UNUSED	= ATH12K_HTC_SVC_ID_RESERVED,
+
+	ATH12K_HTC_SVC_ID_RSVD_CTRL	= SVC(ATH12K_HTC_SVC_GRP_RSVD, 1),
+	ATH12K_HTC_SVC_ID_WMI_CONTROL	= SVC(ATH12K_HTC_SVC_GRP_WMI, 0),
+	ATH12K_HTC_SVC_ID_WMI_DATA_BE	= SVC(ATH12K_HTC_SVC_GRP_WMI, 1),
+	ATH12K_HTC_SVC_ID_WMI_DATA_BK	= SVC(ATH12K_HTC_SVC_GRP_WMI, 2),
+	ATH12K_HTC_SVC_ID_WMI_DATA_VI	= SVC(ATH12K_HTC_SVC_GRP_WMI, 3),
+	ATH12K_HTC_SVC_ID_WMI_DATA_VO	= SVC(ATH12K_HTC_SVC_GRP_WMI, 4),
+	ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC1 = SVC(ATH12K_HTC_SVC_GRP_WMI, 5),
+	ATH12K_HTC_SVC_ID_WMI_CONTROL_MAC2 = SVC(ATH12K_HTC_SVC_GRP_WMI, 6),
+	ATH12K_HTC_SVC_ID_WMI_CONTROL_DIAG = SVC(ATH12K_HTC_SVC_GRP_WMI, 7),
+
+	ATH12K_HTC_SVC_ID_NMI_CONTROL	= SVC(ATH12K_HTC_SVC_GRP_NMI, 0),
+	ATH12K_HTC_SVC_ID_NMI_DATA	= SVC(ATH12K_HTC_SVC_GRP_NMI, 1),
+
+	ATH12K_HTC_SVC_ID_HTT_DATA_MSG	= SVC(ATH12K_HTC_SVC_GRP_HTT, 0),
+
+	/* raw stream service (i.e. flash, tcmd, calibration apps) */
+	ATH12K_HTC_SVC_ID_TEST_RAW_STREAMS = SVC(ATH12K_HTC_SVC_GRP_TEST, 0),
+	ATH12K_HTC_SVC_ID_IPA_TX = SVC(ATH12K_HTC_SVC_GRP_IPA, 0),
+	ATH12K_HTC_SVC_ID_PKT_LOG = SVC(ATH12K_HTC_SVC_GRP_PKTLOG, 0),
+};
+
+#undef SVC
+
+enum ath12k_htc_ep_id {
+	ATH12K_HTC_EP_UNUSED = -1,
+	ATH12K_HTC_EP_0 = 0,
+	ATH12K_HTC_EP_1 = 1,
+	ATH12K_HTC_EP_2,
+	ATH12K_HTC_EP_3,
+	ATH12K_HTC_EP_4,
+	ATH12K_HTC_EP_5,
+	ATH12K_HTC_EP_6,
+	ATH12K_HTC_EP_7,
+	ATH12K_HTC_EP_8,
+	ATH12K_HTC_EP_COUNT,
+};
+
+struct ath12k_htc_ep_ops {
+	void (*ep_tx_complete)(struct ath12k_base *ab, struct sk_buff *skb);
+	void (*ep_rx_complete)(struct ath12k_base *ab, struct sk_buff *skb);
+	void (*ep_tx_credits)(struct ath12k_base *ab);
+};
+
+/* service connection information */
+struct ath12k_htc_svc_conn_req {
+	u16 service_id;
+	struct ath12k_htc_ep_ops ep_ops;
+	int max_send_queue_depth;
+};
+
+/* service connection response information */
+struct ath12k_htc_svc_conn_resp {
+	u8 buffer_len;
+	u8 actual_len;
+	enum ath12k_htc_ep_id eid;
+	unsigned int max_msg_len;
+	u8 connect_resp_code;
+};
+
+#define ATH12K_NUM_CONTROL_TX_BUFFERS 2
+#define ATH12K_HTC_MAX_LEN 4096
+#define ATH12K_HTC_MAX_CTRL_MSG_LEN 256
+#define ATH12K_HTC_WAIT_TIMEOUT_HZ (1 * HZ)
+#define ATH12K_HTC_CONTROL_BUFFER_SIZE (ATH12K_HTC_MAX_CTRL_MSG_LEN + \
+					sizeof(struct ath12k_htc_hdr))
+#define ATH12K_HTC_CONN_SVC_TIMEOUT_HZ (1 * HZ)
+#define ATH12K_HTC_MAX_SERVICE_ALLOC_ENTRIES 8
+
+struct ath12k_htc_ep {
+	struct ath12k_htc *htc;
+	enum ath12k_htc_ep_id eid;
+	enum ath12k_htc_svc_id service_id;
+	struct ath12k_htc_ep_ops ep_ops;
+
+	int max_tx_queue_depth;
+	int max_ep_message_len;
+	u8 ul_pipe_id;
+	u8 dl_pipe_id;
+
+	u8 seq_no; /* for debugging */
+	int tx_credits;
+	bool tx_credit_flow_enabled;
+};
+
+struct ath12k_htc_svc_tx_credits {
+	u16 service_id;
+	u8  credit_allocation;
+};
+
+struct ath12k_htc {
+	struct ath12k_base *ab;
+	struct ath12k_htc_ep endpoint[ATH12K_HTC_EP_COUNT];
+
+	/* protects endpoints */
+	spinlock_t tx_lock;
+
+	u8 control_resp_buffer[ATH12K_HTC_MAX_CTRL_MSG_LEN];
+	int control_resp_len;
+
+	struct completion ctl_resp;
+
+	int total_transmit_credits;
+	struct ath12k_htc_svc_tx_credits
+		service_alloc_table[ATH12K_HTC_MAX_SERVICE_ALLOC_ENTRIES];
+	int target_credit_size;
+	u8 wmi_ep_count;
+};
+
+int ath12k_htc_init(struct ath12k_base *ar);
+int ath12k_htc_wait_target(struct ath12k_htc *htc);
+int ath12k_htc_start(struct ath12k_htc *htc);
+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);
+int ath12k_htc_send(struct ath12k_htc *htc, enum ath12k_htc_ep_id eid,
+		    struct sk_buff *packet);
+struct sk_buff *ath12k_htc_alloc_skb(struct ath12k_base *ar, int size);
+void ath12k_htc_rx_completion_handler(struct ath12k_base *ar,
+				      struct sk_buff *skb);
+
+#endif
