07 Aug 2036 17:17:26 GMT
ETag: "7ff665020015d4c495a5e2f5f13dc41a90d4b6db"

/* SPDX-License-Identifier: ISC */
/*
 * Copyright (c) 2005-2011 Atheros Communications Inc.
 * Copyright (c) 2011-2016 Qualcomm Atheros, Inc.
 */

#ifndef _HTC_H_
#define _HTC_H_

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/bug.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/bitfield.h>

struct ath10k;

/****************/
/* HTC protocol */
/****************/

/*
 * HTC - host-target control protocol
 *
 * tx packets are generally <htc_hdr><payload>
 * rx packets are more complex: <htc_hdr><payload><trailer>
 *
 * The payload + trailer length is stored in len.
 * To get payload-only length one needs to payload - trailer_len.
 *
 * Trailer contains (possibly) multiple <htc_record>.
 * Each record is a id-len-value.
 *
 * HTC header flags, control_byte0, control_byte1
 * have different meaning depending whether its tx
 * or rx.
 *
 * Alignment: htc_hdr, payload and trailer are
 * 4-byte aligned.
 */

#define HTC_HOST_MAX_MSG_PER_RX_BUNDLE        32

enum ath10k_htc_tx_flags {
	ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE = 0x01,
	ATH10K_HTC_FLAG_SEND_BUNDLE        = 0x02
};

enum ath10k_htc_rx_flags {
	ATH10K_HTC_FLAGS_RECV_1MORE_BLOCK = 0x01,
	ATH10K_HTC_FLAG_TRAILER_PRESENT = 0x02,
};

#define ATH10K_HTC_FLAG_BUNDLE_MASK GENMASK(7, 4)

/* bits 2-3 are for extra bundle count bits 4-5 */
#define ATH10K_HTC_BUNDLE_EXTRA_MASK GENMASK(3, 2)
#define ATH10K_HTC_BUNDLE_EXTRA_SHIFT 4

static inline unsigned int ath10k_htc_get_bundle_count(u8 max_msgs, u8 flags)
{
	unsigned int count, extra_count = 0;

	count = FIELD_GET(ATH10K_HTC_FLAG_BUNDLE_MASK, flags);

	if (max_msgs > 16)
		extra_count = FIELD_GET(ATH10K_HTC_BUNDLE_EXTRA_MASK, flags) <<
			ATH10K_HTC_BUNDLE_EXTRA_SHIFT;

	return count + extra_count;
}

struct ath10k_htc_hdr {
	u8 eid; /* @enum ath10k_htc_ep_id */
	u8 flags; /* @enum ath10k_htc_tx_flags, ath10k_htc_rx_flags */
	__le16 len;
	union {
		u8 trailer_len; /* for rx */
		u8 control_byte0;
	} __packed;
	union {
		u8 seq_no; /* for tx */
		u8 control_byte1;
	} __packed;
	union {
		__le16 pad_len;
		struct {
			u8 pad0;
			u8 pad1;
		} __packed;
	} __packed;

} __packed __aligned(4);

enum ath10k_ath10k_htc_msg_id {
	ATH10K_HTC_MSG_READY_ID                = 1,
	ATH10K_HTC_MSG_CONNECT_SERVICE_ID      = 2,
	ATH10K_HTC_MSG_CONNECT_SERVICE_RESP_ID = 3,
	ATH10K_HTC_MSG_SETUP_COMPLETE_ID       = 4,
	ATH10K_HTC_MSG_SETUP_COMPLETE_EX_ID    = 5,
	ATH10K_HTC_MSG_SEND_SUSPEND_COMPLETE   = 6
};

enum ath10k_htc_version {
	ATH10K_HTC_VERSION_2P0 = 0x00, /* 2.0 */
	ATH10K_HTC_VERSION_2P1 = 0x01, /* 2.1 */
};

enum ath10k_htc_conn_flags {
	ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_ONE_FOURTH    = 0x0,
	ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_ONE_HALF      = 0x1,
	ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_THREE_FOURTHS = 0x2,
	ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_UNITY         = 0x3,
#define ATH10K_HTC_CONN_FLAGS_THRESHOLD_LEVEL_MASK 0x3
	ATH10K_HTC_CONN_FLAGS_REDUCE_CREDIT_DRIBBLE    = 1 << 2,
	ATH10K_HTC_CONN_FLAGS_DISABLE_CREDIT_FLOW_CTRL = 1 << 3
#define ATH10K_HTC_CONN_FLAGS_RECV_ALLOC_MASK 0xFF00
#define ATH10K_HTC_CONN_FLAGS_RECV_ALLOC_LSB  8
};

#define ATH10K_HTC_MSG_READY_EXT_ALT_DATA_MASK 0xFFF

enum ath10k_htc_conn_svc_status {
	ATH10K_HTC_CONN_SVC_STATUS_SUCCESS      = 0,
	ATH10K_HTC_CONN_SVC_STATUS_NOT_FOUND    = 1,
	ATH10K_HTC_CONN_SVC_STATUS_FAILED       = 2,
	ATH10K_HTC_CONN_SVC_STATUS_NO_RESOURCES = 3,
	ATH10K_HTC_CONN_SVC_STATUS_NO_MORE_EP   = 4
};

#define ATH10K_MAX_MSG_PER_HTC_TX_BUNDLE        32
#define ATH10K_MIN_MSG_PER_HTC_TX_BUNDLE        2
#define ATH10K_MIN_CREDIT_PER_HTC_TX_BUNDLE     2

enum ath10k_htc_setup_complete_flags {
	ATH10K_HTC_SETUP_COMPLETE_FLAGS_RX_BNDL_EN =