new file mode 100644
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+/* 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