Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem

Conflicts:
	drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsparser.c
	drivers/staging/ath6kl/os/linux/ar6000_drv.c

1 files changed, 2457 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath6kl/htc.c b/drivers/net/wireless/ath/ath6kl/htc.c
new file mode 100644
index 00000000000..a8dc5c3ea56
--- /dev/null
+++ b/drivers/net/wireless/ath/ath6kl/htc.c
@@ -0,0 +1,2457 @@
+/*
+ * Copyright (c) 2007-2011 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "core.h"
+#include "htc_hif.h"
+#include "debug.h"
+#include "hif-ops.h"
+#include <asm/unaligned.h>
+
+#define CALC_TXRX_PADDED_LEN(dev, len)  (__ALIGN_MASK((len), (dev)->block_mask))
+
+static void htc_prep_send_pkt(struct htc_packet *packet, u8 flags, int ctrl0,
+			      int ctrl1)
+{
+	struct htc_frame_hdr *hdr;
+
+	packet->buf -= HTC_HDR_LENGTH;
+	hdr =  (struct htc_frame_hdr *)packet->buf;
+
+	/* Endianess? */
+	put_unaligned((u16)packet->act_len, &hdr->payld_len);
+	hdr->flags = flags;
+	hdr->eid = packet->endpoint;
+	hdr->ctrl[0] = ctrl0;
+	hdr->ctrl[1] = ctrl1;
+}
+
+static void htc_reclaim_txctrl_buf(struct htc_target *target,
+				   struct htc_packet *pkt)
+{
+	spin_lock_bh(&target->htc_lock);
+	list_add_tail(&pkt->list, &target->free_ctrl_txbuf);
+	spin_unlock_bh(&target->htc_lock);
+}
+
+static struct htc_packet *htc_get_control_buf(struct htc_target *target,
+					      bool tx)
+{
+	struct htc_packet *packet = NULL;
+	struct list_head *buf_list;
+
+	buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf;
+
+	spin_lock_bh(&target->htc_lock);
+
+	if (list_empty(buf_list)) {
+		spin_unlock_bh(&target->htc_lock);
+		return NULL;
+	}
+
+	packet = list_first_entry(buf_list, struct htc_packet, list);
+	list_del(&packet->list);
+	spin_unlock_bh(&target->htc_lock);
+
+	if (tx)
+		packet->buf = packet->buf_start + HTC_HDR_LENGTH;
+
+	return packet;
+}
+
+static void htc_tx_comp_update(struct htc_target *target,
+			       struct htc_endpoint *endpoint,
+			       struct htc_packet *packet)
+{
+	packet->completion = NULL;
+	packet->buf += HTC_HDR_LENGTH;
+
+	if (!packet->status)
+		return;
+
+	ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n",
+		   packet->status, packet->endpoint, packet->act_len,
+		   packet->info.tx.cred_used);
+
+	/* on failure to submit, reclaim credits for this packet */
+	spin_lock_bh(&target->tx_lock);
+	endpoint->cred_dist.cred_to_dist +=
+				packet->info.tx.cred_used;
+	endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq);
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "ctxt:0x%p dist:0x%p\n",
+		   target->cred_dist_cntxt, &target->cred_dist_list);
+
+	ath6k_credit_distribute(target->cred_dist_cntxt,
+				&target->cred_dist_list,
+				HTC_CREDIT_DIST_SEND_COMPLETE);
+
+	spin_unlock_bh(&target->tx_lock);
+}
+
+static void htc_tx_complete(struct htc_endpoint *endpoint,
+			    struct list_head *txq)
+{
+	if (list_empty(txq))
+		return;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+		   "send complete ep %d, (%d pkts)\n",
+		   endpoint->eid, get_queue_depth(txq));
+
+	ath6kl_tx_complete(endpoint->target->dev->ar, txq);
+}
+
+static void htc_tx_comp_handler(struct htc_target *target,
+				struct htc_packet *packet)
+{
+	struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint];
+	struct list_head container;
+
+	htc_tx_comp_update(target, endpoint, packet);
+	INIT_LIST_HEAD(&container);
+	list_add_tail(&packet->list, &container);
+	/* do completion */
+	htc_tx_complete(endpoint, &container);
+}
+
+static void htc_async_tx_scat_complete(struct htc_target *target,
+				       struct hif_scatter_req *scat_req)
+{
+	struct htc_endpoint *endpoint;
+	struct htc_packet *packet;
+	struct list_head tx_compq;
+	int i;
+
+	INIT_LIST_HEAD(&tx_compq);
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+		"htc_async_tx_scat_complete  total len: %d  entries: %d\n",
+		scat_req->len, scat_req->scat_entries);
+
+	if (scat_req->status)
+		ath6kl_err("send scatter req failed: %d\n", scat_req->status);
+
+	packet = scat_req->scat_list[0].packet;
+	endpoint = &target->endpoint[packet->endpoint];
+
+	/* walk through the scatter list and process */
+	for (i = 0; i < scat_req->scat_entries; i++) {
+		packet = scat_req->scat_list[i].packet;
+		if (!packet) {
+			WARN_ON(1);
+			return;
+		}
+
+		packet->status = scat_req->status;
+		htc_tx_comp_update(target, endpoint, packet);
+		list_add_tail(&packet->list, &tx_compq);
+	}
+
+	/* free scatter request */
+	hif_scatter_req_add(target->dev->ar, scat_req);
+
+	/* complete all packets */
+	htc_tx_complete(endpoint, &tx_compq);
+}
+
+static int htc_issue_send(struct htc_target *target, struct htc_packet *packet)
+{
+	int status;
+	bool sync = false;
+	u32 padded_len, send_len;
+
+	if (!packet->completion)
+		sync = true;
+
+	send_len = packet->act_len + HTC_HDR_LENGTH;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "%s: transmit len : %d (%s)\n",
+		   __func__, send_len, sync ? "sync" : "async");
+
+	padded_len = CALC_TXRX_PADDED_LEN(target, send_len);
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+		"DevSendPacket, padded len: %d mbox:0x%X (mode:%s)\n",
+		padded_len,
+		target->dev->ar->mbox_info.htc_addr,
+		sync ? "sync" : "async");
+
+	if (sync) {
+		status = hif_read_write_sync(target->dev->ar,
+				target->dev->ar->mbox_info.htc_addr,
+				 packet->buf, padded_len,
+				 HIF_WR_SYNC_BLOCK_INC);
+
+		packet->status = status;
+		 packet->buf += HTC_HDR_LENGTH;
+	} else
+		status = hif_write_async(target->dev->ar,
+				target->dev->ar->mbox_info.htc_addr,
+				packet->buf, padded_len,
+				HIF_WR_ASYNC_BLOCK_INC, packet);
+
+	return status;
+}
+
+static int htc_check_credits(struct htc_target *target,
+			     struct htc_endpoint *ep, u8 *flags,
+			     enum htc_endpoint_id eid, unsigned int len,
+			     int *req_cred)
+{
+
+	*req_cred = (len > target->tgt_cred_sz) ?
+		     DIV_ROUND_UP(len, target->tgt_cred_sz) : 1;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "creds required:%d got:%d\n",
+		   *req_cred, ep->cred_dist.credits);
+
+	if (ep->cred_dist.credits < *req_cred) {
+		if (eid == ENDPOINT_0)
+			return -EINVAL;
+
+		/* Seek more credits */
+		ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits;
+
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "ctxt:0x%p dist:0x%p\n",
+			   target->cred_dist_cntxt, &ep->cred_dist);
+
+		ath6k_seek_credits(target->cred_dist_cntxt, &ep->cred_dist);
+
+		ep->cred_dist.seek_cred = 0;
+
+		if (ep->cred_dist.credits < *req_cred) {
+			ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+				   "not enough credits for ep %d - leaving packet in queue\n",
+				   eid);
+			return -EINVAL;
+		}
+	}
+
+	ep->cred_dist.credits -= *req_cred;
+	ep->ep_st.cred_cosumd += *req_cred;
+
+	 /* When we are getting low on credits, ask for more */
+	if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
+		ep->cred_dist.seek_cred =
+		ep->cred_dist.cred_per_msg - ep->cred_dist.credits;
+
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "ctxt:0x%p dist:0x%p\n",
+			   target->cred_dist_cntxt, &ep->cred_dist);
+
+		ath6k_seek_credits(target->cred_dist_cntxt, &ep->cred_dist);
+
+		/* see if we were successful in getting more */
+		if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
+			/* tell the target we need credits ASAP! */
+			*flags |= HTC_FLAGS_NEED_CREDIT_UPDATE;
+			ep->ep_st.cred_low_indicate += 1;
+			ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "host needs credits\n");
+		}
+	}
+
+	return 0;
+}
+
+static void htc_tx_pkts_get(struct htc_target *target,
+			    struct htc_endpoint *endpoint,
+			    struct list_head *queue)
+{
+	int req_cred;
+	u8 flags;
+	struct htc_packet *packet;
+	unsigned int len;
+
+	while (true) {
+
+		flags = 0;
+
+		if (list_empty(&endpoint->txq))
+			break;
+		packet = list_first_entry(&endpoint->txq, struct htc_packet,
+					  list);
+
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+			"got head pkt:0x%p , queue depth: %d\n",
+			packet, get_queue_depth(&endpoint->txq));
+
+		len = CALC_TXRX_PADDED_LEN(target,
+					   packet->act_len + HTC_HDR_LENGTH);
+
+		if (htc_check_credits(target, endpoint, &flags,
+				      packet->endpoint, len, &req_cred))
+			break;
+
+		/* now we can fully move onto caller's queue */
+		packet = list_first_entry(&endpoint->txq, struct htc_packet,
+					  list);
+		list_move_tail(&packet->list, queue);
+
+		/* save the number of credits this packet consumed */
+		packet->info.tx.cred_used = req_cred;
+
+		/* all TX packets are handled asynchronously */
+		packet->completion = htc_tx_comp_handler;
+		packet->context = target;
+		endpoint->ep_st.tx_issued += 1;
+
+		/* save send flags */
+		packet->info.tx.flags = flags;
+		packet->info.tx.seqno = endpoint->seqno;
+		endpoint->seqno++;
+	}
+}
+
+/* See if the padded tx length falls on a credit boundary */
+static int htc_get_credit_padding(unsigned int cred_sz, int *len,
+				  struct htc_endpoint *ep)
+{
+	int rem_cred, cred_pad;
+
+	rem_cred = *len % cred_sz;
+
+	/* No padding needed */
+	if  (!rem_cred)
+		return 0;
+
+	if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN))
+		return -1;
+
+	/*
+	 * The transfer consumes a "partial" credit, this
+	 * packet cannot be bundled unless we add
+	 * additional "dummy" padding (max 255 bytes) to
+	 * consume the entire credit.
+	 */
+	cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred;
+
+	if ((cred_pad > 0) && (cred_pad <= 255))
+		*len += cred_pad;
+	else
+		/* The amount of padding is too large, send as non-bundled */
+		return -1;
+
+	return cred_pad;
+}
+
+static int htc_setup_send_scat_list(struct htc_target *target,
+				    struct htc_endpoint *endpoint,
+				    struct hif_scatter_req *scat_req,
+				    int n_scat,
+				    struct list_head *queue)
+{
+	struct htc_packet *packet;
+	int i, len, rem_scat, cred_pad;
+	int status = 0;
+
+	rem_scat = target->max_tx_bndl_sz;
+
+	for (i = 0; i < n_scat; i++) {
+		scat_req->scat_list[i].packet = NULL;
+
+		if (list_empty(queue))
+			break;
+
+		packet = list_first_entry(queue, struct htc_packet, list);
+		len = CALC_TXRX_PADDED_LEN(target,
+					   packet->act_len + HTC_HDR_LENGTH);
+
+		cred_pad = htc_get_credit_padding(target->tgt_cred_sz,
+						  &len, endpoint);
+		if (cred_pad < 0) {
+			status = -EINVAL;
+			break;
+		}
+
+		if (rem_scat < len) {
+			/* exceeds what we can transfer */
+			status = -ENOSPC;
+			break;
+		}
+
+		rem_scat -= len;
+		/* now remove it from the queue */
+		packet = list_first_entry(queue, struct htc_packet, list);
+		list_del(&packet->list);
+
+		scat_req->scat_list[i].packet = packet;
+		/* prepare packet and flag message as part of a send bundle */
+		htc_prep_send_pkt(packet,
+				packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE,
+				cred_pad, packet->info.tx.seqno);
+		scat_req->scat_list[i].buf = packet->buf;
+		scat_req->scat_list[i].len = len;
+
+		scat_req->len += len;
+		scat_req->scat_entries++;
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+			   "%d, adding pkt : 0x%p len:%d (remaining space:%d)\n",
+			   i, packet, len, rem_scat);
+	}
+
+	/* Roll back scatter setup in case of any failure */
+	if (status || (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE)) {
+		for (i = scat_req->scat_entries - 1; i >= 0; i--) {
+			packet = scat_req->scat_list[i].packet;
+			if (packet) {
+				packet->buf += HTC_HDR_LENGTH;
+				list_add(&packet->list, queue);
+			}
+		}
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * htc_issue_send_bundle: drain a queue and send as bundles
+ * this function may return without fully draining the queue
+ * when
+ *
+ *    1. scatter resources are exhausted
+ *    2. a message that will consume a partial credit will stop the
+ *    bundling process early
+ *    3. we drop below the minimum number of messages for a bundle
+ */
+static void htc_issue_send_bundle(struct htc_endpoint *endpoint,
+				  struct list_head *queue,
+				  int *sent_bundle, int *n_bundle_pkts)
+{
+	struct htc_target *target = endpoint->target;
+	struct hif_scatter_req *scat_req = NULL;
+	int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0;
+
+	while (true) {
+		n_scat = get_queue_depth(queue);
+		n_scat = min(n_scat, target->msg_per_bndl_max);
+
+		if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE)
+			/* not enough to bundle */
+			break;
+
+		scat_req = hif_scatter_req_get(target->dev->ar);
+
+		if (!scat_req) {
+			/* no scatter resources  */
+			ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+				"no more scatter resources\n");
+			break;
+		}
+
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "pkts to scatter: %d\n",
+			   n_scat);
+
+		scat_req->len = 0;
+		scat_req->scat_entries = 0;
+
+		if (htc_setup_send_scat_list(target, endpoint, scat_req,
+					     n_scat, queue)) {
+			hif_scatter_req_add(target->dev->ar, scat_req);
+			break;
+		}
+
+		/* send path is always asynchronous */
+		scat_req->complete = htc_async_tx_scat_complete;
+		n_sent_bundle++;
+		tot_pkts_bundle += scat_req->scat_entries;
+
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+			   "send scatter total bytes: %d , entries: %d\n",
+			   scat_req->len, scat_req->scat_entries);
+		ath6kldev_submit_scat_req(target->dev, scat_req, false);
+	}
+
+	*sent_bundle = n_sent_bundle;
+	*n_bundle_pkts = tot_pkts_bundle;
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "htc_issue_send_bundle (sent:%d)\n",
+		   n_sent_bundle);
+
+	return;
+}
+
+static void htc_tx_from_ep_txq(struct htc_target *target,
+			       struct htc_endpoint *endpoint)
+{
+	struct list_head txq;
+	struct htc_packet *packet;
+	int bundle_sent;
+	int n_pkts_bundle;
+
+	spin_lock_bh(&target->tx_lock);
+
+	endpoint->tx_proc_cnt++;
+	if (endpoint->tx_proc_cnt > 1) {
+		endpoint->tx_proc_cnt--;
+		spin_unlock_bh(&target->tx_lock);
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "htc_try_send (busy)\n");
+		return;
+	}
+
+	/*
+	 * drain the endpoint TX queue for transmission as long
+	 * as we have enough credits.
+	 */
+	INIT_LIST_HEAD(&txq);
+
+	while (true) {
+
+		if (list_empty(&endpoint->txq))
+			break;
+
+		htc_tx_pkts_get(target, endpoint, &txq);
+
+		if (list_empty(&txq))
+			break;
+
+		spin_unlock_bh(&target->tx_lock);
+
+		bundle_sent = 0;
+		n_pkts_bundle = 0;
+
+		while (true) {
+			/* try to send a bundle on each pass */
+			if ((target->tx_bndl_enable) &&
+			    (get_queue_depth(&txq) >=
+			    HTC_MIN_HTC_MSGS_TO_BUNDLE)) {
+				int temp1 = 0, temp2 = 0;
+
+				htc_issue_send_bundle(endpoint, &txq,
+						      &temp1, &temp2);
+				bundle_sent += temp1;
+				n_pkts_bundle += temp2;
+			}
+
+			if (list_empty(&txq))
+				break;
+
+			packet = list_first_entry(&txq, struct htc_packet,
+						  list);
+			list_del(&packet->list);
+
+			htc_prep_send_pkt(packet, packet->info.tx.flags,
+					  0, packet->info.tx.seqno);
+			htc_issue_send(target, packet);
+		}
+
+		spin_lock_bh(&target->tx_lock);
+
+		endpoint->ep_st.tx_bundles += bundle_sent;
+		endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle;
+	}
+
+	endpoint->tx_proc_cnt = 0;
+	spin_unlock_bh(&target->tx_lock);
+}
+
+static bool htc_try_send(struct htc_target *target,
+			 struct htc_endpoint *endpoint,
+			 struct htc_packet *tx_pkt)
+{
+	struct htc_ep_callbacks ep_cb;
+	int txq_depth;
+	bool overflow = false;
+
+	ep_cb = endpoint->ep_cb;
+
+	spin_lock_bh(&target->tx_lock);
+	txq_depth = get_queue_depth(&endpoint->txq);
+	spin_unlock_bh(&target->tx_lock);
+
+	if (txq_depth >= endpoint->max_txq_depth)
+		overflow = true;
+
+	if (overflow)
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+			   "ep %d, tx queue will overflow :%d , tx depth:%d, max:%d\n",
+			   endpoint->eid, overflow, txq_depth,
+			   endpoint->max_txq_depth);
+
+	if (overflow && ep_cb.tx_full) {
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+			   "indicating overflowed tx packet: 0x%p\n", tx_pkt);
+
+		if (ep_cb.tx_full(endpoint->target, tx_pkt) ==
+		    HTC_SEND_FULL_DROP) {
+			endpoint->ep_st.tx_dropped += 1;
+			return false;
+		}
+	}
+
+	spin_lock_bh(&target->tx_lock);
+	list_add_tail(&tx_pkt->list, &endpoint->txq);
+	spin_unlock_bh(&target->tx_lock);
+
+	htc_tx_from_ep_txq(target, endpoint);
+
+	return true;
+}
+
+static void htc_chk_ep_txq(struct htc_target *target)
+{
+	struct htc_endpoint *endpoint;
+	struct htc_endpoint_credit_dist *cred_dist;
+
+	/*
+	 * Run through the credit distribution list to see if there are
+	 * packets queued. NOTE: no locks need to be taken since the
+	 * distribution list is not dynamic (cannot be re-ordered) and we
+	 * are not modifying any state.
+	 */
+	list_for_each_entry(cred_dist, &target->cred_dist_list, list) {
+		endpoint = (struct htc_endpoint *)cred_dist->htc_rsvd;
+
+		spin_lock_bh(&target->tx_lock);
+		if (!list_empty(&endpoint->txq)) {
+			ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+				   "ep %d has %d credits and %d packets in tx queue\n",
+				   cred_dist->endpoint,
+				   endpoint->cred_dist.credits,
+				   get_queue_depth(&endpoint->txq));
+			spin_unlock_bh(&target->tx_lock);
+			/*
+			 * Try to start the stalled queue, this list is
+			 * ordered by priority. If there are credits
+			 * available the highest priority queue will get a
+			 * chance to reclaim credits from lower priority
+			 * ones.
+			 */
+			htc_tx_from_ep_txq(target, endpoint);
+			spin_lock_bh(&target->tx_lock);
+		}
+		spin_unlock_bh(&target->tx_lock);
+	}
+}
+
+static int htc_setup_tx_complete(struct htc_target *target)
+{
+	struct htc_packet *send_pkt = NULL;
+	int status;
+
+	send_pkt = htc_get_control_buf(target, true);
+
+	if (!send_pkt)
+		return -ENOMEM;
+
+	if (target->htc_tgt_ver >= HTC_VERSION_2P1) {
+		struct htc_setup_comp_ext_msg *setup_comp_ext;
+		u32 flags = 0;
+
+		setup_comp_ext =
+		    (struct htc_setup_comp_ext_msg *)send_pkt->buf;
+		memset(setup_comp_ext, 0, sizeof(*setup_comp_ext));
+		setup_comp_ext->msg_id =
+			cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID);
+
+		if (target->msg_per_bndl_max > 0) {
+			/* Indicate HTC bundling to the target */
+			flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN;
+			setup_comp_ext->msg_per_rxbndl =
+						target->msg_per_bndl_max;
+		}
+
+		memcpy(&setup_comp_ext->flags, &flags,
+		       sizeof(setup_comp_ext->flags));
+		set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext,
+				       sizeof(struct htc_setup_comp_ext_msg),
+				       ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
+
+	} else {
+		struct htc_setup_comp_msg *setup_comp;
+		setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf;
+		memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg));
+		setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID);
+		set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp,
+				       sizeof(struct htc_setup_comp_msg),
+				       ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
+	}
+
+	/* we want synchronous operation */
+	send_pkt->completion = NULL;
+	htc_prep_send_pkt(send_pkt, 0, 0, 0);
+	status = htc_issue_send(target, send_pkt);
+
+	if (send_pkt != NULL)
+		htc_reclaim_txctrl_buf(target, send_pkt);
+
+	return status;
+}
+
+void ath6kl_htc_set_credit_dist(struct htc_target *target,
+				struct htc_credit_state_info *cred_dist_cntxt,
+				u16 srvc_pri_order[], int list_len)
+{
+	struct htc_endpoint *endpoint;
+	int i, ep;
+
+	target->cred_dist_cntxt = cred_dist_cntxt;
+
+	list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list,
+		      &target->cred_dist_list);
+
+	for (i = 0; i < list_len; i++) {
+		for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) {
+			endpoint = &target->endpoint[ep];
+			if (endpoint->svc_id == srvc_pri_order[i]) {
+				list_add_tail(&endpoint->cred_dist.list,
+					      &target->cred_dist_list);
+				break;
+			}
+		}
+		if (ep >= ENDPOINT_MAX) {
+			WARN_ON(1);
+			return;
+		}
+	}
+}
+
+int ath6kl_htc_tx(struct htc_target *target, struct htc_packet *packet)
+{
+	struct htc_endpoint *endpoint;
+	struct list_head queue;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+		   "htc_tx: ep id: %d, buf: 0x%p, len: %d\n",
+		   packet->endpoint, packet->buf, packet->act_len);
+
+	if (packet->endpoint >= ENDPOINT_MAX) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	endpoint = &target->endpoint[packet->endpoint];
+
+	if (!htc_try_send(target, endpoint, packet)) {
+		packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ?
+				 -ECANCELED : -ENOSPC;
+		INIT_LIST_HEAD(&queue);
+		list_add(&packet->list, &queue);
+		htc_tx_complete(endpoint, &queue);
+	}
+
+	return 0;
+}
+
+/* flush endpoint TX queue */
+void ath6kl_htc_flush_txep(struct htc_target *target,
+			   enum htc_endpoint_id eid, u16 tag)
+{
+	struct htc_packet *packet, *tmp_pkt;
+	struct list_head discard_q, container;
+	struct htc_endpoint *endpoint = &target->endpoint[eid];
+
+	if (!endpoint->svc_id) {
+		WARN_ON(1);
+		return;
+	}
+
+	/* initialize the discard queue */
+	INIT_LIST_HEAD(&discard_q);
+
+	spin_lock_bh(&target->tx_lock);
+
+	list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) {
+		if ((tag == HTC_TX_PACKET_TAG_ALL) ||
+		    (tag == packet->info.tx.tag))
+			list_move_tail(&packet->list, &discard_q);
+	}
+
+	spin_unlock_bh(&target->tx_lock);
+
+	list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) {
+		packet->status = -ECANCELED;
+		list_del(&packet->list);
+		ath6kl_dbg(ATH6KL_DBG_TRC,
+			"flushing tx pkt:0x%p, len:%d, ep:%d tag:0x%X\n",
+			packet, packet->act_len,
+			packet->endpoint, packet->info.tx.tag);
+
+		INIT_LIST_HEAD(&container);
+		list_add_tail(&packet->list, &container);
+		htc_tx_complete(endpoint, &container);
+	}
+
+}
+
+static void ath6kl_htc_flush_txep_all(struct htc_target *target)
+{
+	struct htc_endpoint *endpoint;
+	int i;
+
+	dump_cred_dist_stats(target);
+
+	for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
+		endpoint = &target->endpoint[i];
+		if (endpoint->svc_id == 0)
+			/* not in use.. */
+			continue;
+		ath6kl_htc_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL);
+	}
+}
+
+void ath6kl_htc_indicate_activity_change(struct htc_target *target,
+					 enum htc_endpoint_id eid, bool active)
+{
+	struct htc_endpoint *endpoint = &target->endpoint[eid];
+	bool dist = false;
+
+	if (endpoint->svc_id == 0) {
+		WARN_ON(1);
+		return;
+	}
+
+	spin_lock_bh(&target->tx_lock);
+
+	if (active) {
+		if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) {
+			endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE;
+			dist = true;
+		}
+	} else {
+		if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) {
+			endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE;
+			dist = true;
+		}
+	}
+
+	if (dist) {
+		endpoint->cred_dist.txq_depth =
+			get_queue_depth(&endpoint->txq);
+
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "ctxt:0x%p dist:0x%p\n",
+			   target->cred_dist_cntxt, &target->cred_dist_list);
+
+		ath6k_credit_distribute(target->cred_dist_cntxt,
+					&target->cred_dist_list,
+					HTC_CREDIT_DIST_ACTIVITY_CHANGE);
+	}
+
+	spin_unlock_bh(&target->tx_lock);
+
+	if (dist && !active)
+		htc_chk_ep_txq(target);
+}
+
+/* HTC Rx */
+
+static inline void htc_update_rx_stats(struct htc_endpoint *endpoint,
+				       int n_look_ahds)
+{
+	endpoint->ep_st.rx_pkts++;
+	if (n_look_ahds == 1)
+		endpoint->ep_st.rx_lkahds++;
+	else if (n_look_ahds > 1)
+		endpoint->ep_st.rx_bundle_lkahd++;
+}
+
+static inline bool htc_valid_rx_frame_len(struct htc_target *target,
+					  enum htc_endpoint_id eid, int len)
+{
+	return (eid == target->dev->ar->ctrl_ep) ?
+		len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE;
+}
+
+static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet)
+{
+	struct list_head queue;
+
+	INIT_LIST_HEAD(&queue);
+	list_add_tail(&packet->list, &queue);
+	return ath6kl_htc_add_rxbuf_multiple(target, &queue);
+}
+
+static void htc_reclaim_rxbuf(struct htc_target *target,
+			      struct htc_packet *packet,
+			      struct htc_endpoint *ep)
+{
+	if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) {
+		htc_rxpkt_reset(packet);
+		packet->status = -ECANCELED;
+		ep->ep_cb.rx(ep->target, packet);
+	} else {
+		htc_rxpkt_reset(packet);
+		htc_add_rxbuf((void *)(target), packet);
+	}
+}
+
+static void reclaim_rx_ctrl_buf(struct htc_target *target,
+				struct htc_packet *packet)
+{
+	spin_lock_bh(&target->htc_lock);
+	list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
+	spin_unlock_bh(&target->htc_lock);
+}
+
+static int dev_rx_pkt(struct htc_target *target, struct htc_packet *packet,
+		      u32 rx_len)
+{
+	struct ath6kl_device *dev = target->dev;
+	u32 padded_len;
+	int status;
+
+	padded_len = CALC_TXRX_PADDED_LEN(target, rx_len);
+
+	if (padded_len > packet->buf_len) {
+		ath6kl_err("not enough receive space for packet - padlen:%d recvlen:%d bufferlen:%d\n",
+			   padded_len, rx_len, packet->buf_len);
+		return -ENOMEM;
+	}
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+		   "dev_rx_pkt (0x%p : hdr:0x%X) padded len: %d mbox:0x%X (mode:%s)\n",
+		   packet, packet->info.rx.exp_hdr,
+		   padded_len, dev->ar->mbox_info.htc_addr, "sync");
+
+	status = hif_read_write_sync(dev->ar,
+				     dev->ar->mbox_info.htc_addr,
+				     packet->buf, padded_len,
+				     HIF_RD_SYNC_BLOCK_FIX);
+
+	packet->status = status;
+
+	return status;
+}
+
+/*
+ * optimization for recv packets, we can indicate a
+ * "hint" that there are more  single-packets to fetch
+ * on this endpoint.
+ */
+static void set_rxpkt_indication_flag(u32 lk_ahd,
+				      struct htc_endpoint *endpoint,
+				      struct htc_packet *packet)
+{
+	struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd;
+
+	if (htc_hdr->eid == packet->endpoint) {
+		if (!list_empty(&endpoint->rx_bufq))
+			packet->info.rx.indicat_flags |=
+					HTC_RX_FLAGS_INDICATE_MORE_PKTS;
+	}
+}
+
+static void chk_rx_water_mark(struct htc_endpoint *endpoint)
+{
+	struct htc_ep_callbacks ep_cb = endpoint->ep_cb;
+
+	if (ep_cb.rx_refill_thresh > 0) {
+		spin_lock_bh(&endpoint->target->rx_lock);
+		if (get_queue_depth(&endpoint->rx_bufq)
+		    < ep_cb.rx_refill_thresh) {
+			spin_unlock_bh(&endpoint->target->rx_lock);
+			ep_cb.rx_refill(endpoint->target, endpoint->eid);
+			return;
+		}
+		spin_unlock_bh(&endpoint->target->rx_lock);
+	}
+}
+
+/* This function is called with rx_lock held */
+static int htc_setup_rxpkts(struct htc_target *target, struct htc_endpoint *ep,
+			    u32 *lk_ahds, struct list_head *queue, int n_msg)
+{
+	struct htc_packet *packet;
+	/* FIXME: type of lk_ahds can't be right */
+	struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds;
+	struct htc_ep_callbacks ep_cb;
+	int status = 0, j, full_len;
+	bool no_recycle;
+
+	full_len = CALC_TXRX_PADDED_LEN(target,
+					le16_to_cpu(htc_hdr->payld_len) +
+					sizeof(*htc_hdr));
+
+	if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) {
+		ath6kl_warn("Rx buffer requested with invalid length\n");
+		return -EINVAL;
+	}
+
+	ep_cb = ep->ep_cb;
+	for (j = 0; j < n_msg; j++) {
+
+		/*
+		 * Reset flag, any packets allocated using the
+		 * rx_alloc() API cannot be recycled on
+		 * cleanup,they must be explicitly returned.
+		 */
+		no_recycle = false;
+
+		if (ep_cb.rx_allocthresh &&
+		    (full_len > ep_cb.rx_alloc_thresh)) {
+			ep->ep_st.rx_alloc_thresh_hit += 1;
+			ep->ep_st.rxalloc_thresh_byte +=
+				le16_to_cpu(htc_hdr->payld_len);
+
+			spin_unlock_bh(&target->rx_lock);
+			no_recycle = true;
+
+			packet = ep_cb.rx_allocthresh(ep->target, ep->eid,
+						      full_len);
+			spin_lock_bh(&target->rx_lock);
+		} else {
+			/* refill handler is being used */
+			if (list_empty(&ep->rx_bufq)) {
+				if (ep_cb.rx_refill) {
+					spin_unlock_bh(&target->rx_lock);
+					ep_cb.rx_refill(ep->target, ep->eid);
+					spin_lock_bh(&target->rx_lock);
+				}
+			}
+
+			if (list_empty(&ep->rx_bufq))
+				packet = NULL;
+			else {
+				packet = list_first_entry(&ep->rx_bufq,
+						struct htc_packet, list);
+				list_del(&packet->list);
+			}
+		}
+
+		if (!packet) {
+			target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS;
+			target->ep_waiting = ep->eid;
+			return -ENOSPC;
+		}
+
+		/* clear flags */
+		packet->info.rx.rx_flags = 0;
+		packet->info.rx.indicat_flags = 0;
+		packet->status = 0;
+
+		if (no_recycle)
+			/*
+			 * flag that these packets cannot be
+			 * recycled, they have to be returned to
+			 * the user
+			 */
+			packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE;
+
+		/* Caller needs to free this upon any failure */
+		list_add_tail(&packet->list, queue);
+
+		if (target->htc_flags & HTC_OP_STATE_STOPPING) {
+			status = -ECANCELED;
+			break;
+		}
+
+		if (j) {
+			packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR;
+			packet->info.rx.exp_hdr = 0xFFFFFFFF;
+		} else
+			/* set expected look ahead */
+			packet->info.rx.exp_hdr = *lk_ahds;
+
+		packet->act_len = le16_to_cpu(htc_hdr->payld_len) +
+			HTC_HDR_LENGTH;
+	}
+
+	return status;
+}
+
+static int alloc_and_prep_rxpkts(struct htc_target *target,
+				 u32 lk_ahds[], int msg,
+				 struct htc_endpoint *endpoint,
+				 struct list_head *queue)
+{
+	int status = 0;
+	struct htc_packet *packet, *tmp_pkt;
+	struct htc_frame_hdr *htc_hdr;
+	int i, n_msg;
+
+	spin_lock_bh(&target->rx_lock);
+
+	for (i = 0; i < msg; i++) {
+
+		htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i];
+
+		if (htc_hdr->eid >= ENDPOINT_MAX) {
+			ath6kl_err("invalid ep in look-ahead: %d\n",
+				   htc_hdr->eid);
+			status = -ENOMEM;
+			break;
+		}
+
+		if (htc_hdr->eid != endpoint->eid) {
+			ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n",
+				   htc_hdr->eid, endpoint->eid, i);
+			status = -ENOMEM;
+			break;
+		}
+
+		if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) {
+			ath6kl_err("payload len %d exceeds max htc : %d !\n",
+				   htc_hdr->payld_len,
+				   (u32) HTC_MAX_PAYLOAD_LENGTH);
+			status = -ENOMEM;
+			break;
+		}
+
+		if (endpoint->svc_id == 0) {
+			ath6kl_err("ep %d is not connected !\n", htc_hdr->eid);
+			status = -ENOMEM;
+			break;
+		}
+
+		if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) {
+			/*
+			 * HTC header indicates that every packet to follow
+			 * has the same padded length so that it can be
+			 * optimally fetched as a full bundle.
+			 */
+			n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >>
+				HTC_FLG_RX_BNDL_CNT_S;
+
+			/* the count doesn't include the starter frame */
+			n_msg++;
+			if (n_msg > target->msg_per_bndl_max) {
+				status = -ENOMEM;
+				break;
+			}
+
+			endpoint->ep_st.rx_bundle_from_hdr += 1;
+			ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+				   "htc hdr indicates :%d msg can be fetched as a bundle\n",
+				   n_msg);
+		} else
+			/* HTC header only indicates 1 message to fetch */
+			n_msg = 1;
+
+		/* Setup packet buffers for each message */
+		status = htc_setup_rxpkts(target, endpoint, &lk_ahds[i], queue,
+					  n_msg);
+
+		/*
+		 * This is due to unavailabilty of buffers to rx entire data.
+		 * Return no error so that free buffers from queue can be used
+		 * to receive partial data.
+		 */
+		if (status == -ENOSPC) {
+			spin_unlock_bh(&target->rx_lock);
+			return 0;
+		}
+
+		if (status)
+			break;
+	}
+
+	spin_unlock_bh(&target->rx_lock);
+
+	if (status) {
+		list_for_each_entry_safe(packet, tmp_pkt, queue, list) {
+			list_del(&packet->list);
+			htc_reclaim_rxbuf(target, packet,
+					  &target->endpoint[packet->endpoint]);
+		}
+	}
+
+	return status;
+}
+
+static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets)
+{
+	if (packets->endpoint != ENDPOINT_0) {
+		WARN_ON(1);
+		return;
+	}
+
+	if (packets->status == -ECANCELED) {
+		reclaim_rx_ctrl_buf(context, packets);
+		return;
+	}
+
+	if (packets->act_len > 0) {
+		ath6kl_err("htc_ctrl_rx, got message with len:%zu\n",
+			packets->act_len + HTC_HDR_LENGTH);
+
+		ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES,
+			     "Unexpected ENDPOINT 0 Message",
+			     packets->buf - HTC_HDR_LENGTH,
+			     packets->act_len + HTC_HDR_LENGTH);
+	}
+
+	htc_reclaim_rxbuf(context, packets, &context->endpoint[0]);
+}
+
+static void htc_proc_cred_rpt(struct htc_target *target,
+			      struct htc_credit_report *rpt,
+			      int n_entries,
+			      enum htc_endpoint_id from_ep)
+{
+	struct htc_endpoint *endpoint;
+	int tot_credits = 0, i;
+	bool dist = false;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+		   "htc_proc_cred_rpt, credit report entries:%d\n", n_entries);
+
+	spin_lock_bh(&target->tx_lock);
+
+	for (i = 0; i < n_entries; i++, rpt++) {
+		if (rpt->eid >= ENDPOINT_MAX) {
+			WARN_ON(1);
+			spin_unlock_bh(&target->tx_lock);
+			return;
+		}
+
+		endpoint = &target->endpoint[rpt->eid];
+
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND, " ep %d got %d credits\n",
+			rpt->eid, rpt->credits);
+
+		endpoint->ep_st.tx_cred_rpt += 1;
+		endpoint->ep_st.cred_retnd += rpt->credits;
+
+		if (from_ep == rpt->eid) {
+			/*
+			 * This credit report arrived on the same endpoint
+			 * indicating it arrived in an RX packet.
+			 */
+			endpoint->ep_st.cred_from_rx += rpt->credits;
+			endpoint->ep_st.cred_rpt_from_rx += 1;
+		} else if (from_ep == ENDPOINT_0) {
+			/* credit arrived on endpoint 0 as a NULL message */
+			endpoint->ep_st.cred_from_ep0 += rpt->credits;
+			endpoint->ep_st.cred_rpt_ep0 += 1;
+		} else {
+			endpoint->ep_st.cred_from_other += rpt->credits;
+			endpoint->ep_st.cred_rpt_from_other += 1;
+		}
+
+		if (rpt->eid == ENDPOINT_0)
+			/* always give endpoint 0 credits back */
+			endpoint->cred_dist.credits += rpt->credits;
+		else {
+			endpoint->cred_dist.cred_to_dist += rpt->credits;
+			dist = true;
+		}
+
+		/*
+		 * Refresh tx depth for distribution function that will
+		 * recover these credits NOTE: this is only valid when
+		 * there are credits to recover!
+		 */
+		endpoint->cred_dist.txq_depth =
+			get_queue_depth(&endpoint->txq);
+
+		tot_credits += rpt->credits;
+	}
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_SEND,
+		   "report indicated %d credits to distribute\n",
+		   tot_credits);
+
+	if (dist) {
+		/*
+		 * This was a credit return based on a completed send
+		 * operations note, this is done with the lock held
+		 */
+		ath6kl_dbg(ATH6KL_DBG_HTC_SEND, "ctxt:0x%p dist:0x%p\n",
+			   target->cred_dist_cntxt, &target->cred_dist_list);
+
+		ath6k_credit_distribute(target->cred_dist_cntxt,
+					&target->cred_dist_list,
+					HTC_CREDIT_DIST_SEND_COMPLETE);
+	}
+
+	spin_unlock_bh(&target->tx_lock);
+
+	if (tot_credits)
+		htc_chk_ep_txq(target);
+}
+
+static int htc_parse_trailer(struct htc_target *target,
+			     struct htc_record_hdr *record,
+			     u8 *record_buf, u32 *next_lk_ahds,
+			     enum htc_endpoint_id endpoint,
+			     int *n_lk_ahds)
+{
+	struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt;
+	struct htc_lookahead_report *lk_ahd;
+	int len;
+
+	switch (record->rec_id) {
+	case HTC_RECORD_CREDITS:
+		len = record->len / sizeof(struct htc_credit_report);
+		if (!len) {
+			WARN_ON(1);
+			return -EINVAL;
+		}
+
+		htc_proc_cred_rpt(target,
+				  (struct htc_credit_report *) record_buf,
+				  len, endpoint);
+		break;
+	case HTC_RECORD_LOOKAHEAD:
+		len = record->len / sizeof(*lk_ahd);
+		if (!len) {
+			WARN_ON(1);
+			return -EINVAL;
+		}
+
+		lk_ahd = (struct htc_lookahead_report *) record_buf;
+		if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF))
+		    && next_lk_ahds) {
+
+			ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+				   "lk_ahd report found (pre valid:0x%X, post valid:0x%X)\n",
+				   lk_ahd->pre_valid, lk_ahd->post_valid);
+
+			/* look ahead bytes are valid, copy them over */
+			memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4);
+
+			ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, "Next Look Ahead",
+					next_lk_ahds, 4);
+
+			*n_lk_ahds = 1;
+		}
+		break;
+	case HTC_RECORD_LOOKAHEAD_BUNDLE:
+		len = record->len / sizeof(*bundle_lkahd_rpt);
+		if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) {
+			WARN_ON(1);
+			return -EINVAL;
+		}
+
+		if (next_lk_ahds) {
+			int i;
+
+			bundle_lkahd_rpt =
+				(struct htc_bundle_lkahd_rpt *) record_buf;
+
+			ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, "Bundle lk_ahd",
+					record_buf, record->len);
+
+			for (i = 0; i < len; i++) {
+				memcpy((u8 *)&next_lk_ahds[i],
+				       bundle_lkahd_rpt->lk_ahd, 4);
+				bundle_lkahd_rpt++;
+			}
+
+			*n_lk_ahds = i;
+		}
+		break;
+	default:
+		ath6kl_err("unhandled record: id:%d len:%d\n",
+			   record->rec_id, record->len);
+		break;
+	}
+
+	return 0;
+
+}
+
+static int htc_proc_trailer(struct htc_target *target,
+			    u8 *buf, int len, u32 *next_lk_ahds,
+			    int *n_lk_ahds, enum htc_endpoint_id endpoint)
+{
+	struct htc_record_hdr *record;
+	int orig_len;
+	int status;
+	u8 *record_buf;
+	u8 *orig_buf;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_RECV, "+htc_proc_trailer (len:%d)\n", len);
+
+	ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, "Recv Trailer", buf, len);
+
+	orig_buf = buf;
+	orig_len = len;
+	status = 0;
+
+	while (len > 0) {
+
+		if (len < sizeof(struct htc_record_hdr)) {
+			status = -ENOMEM;
+			break;
+		}
+		/* these are byte aligned structs */
+		record = (struct htc_record_hdr *) buf;
+		len -= sizeof(struct htc_record_hdr);
+		buf += sizeof(struct htc_record_hdr);
+
+		if (record->len > len) {
+			ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n",
+				   record->len, record->rec_id, len);
+			status = -ENOMEM;
+			break;
+		}
+		record_buf = buf;
+
+		status = htc_parse_trailer(target, record, record_buf,
+					   next_lk_ahds, endpoint, n_lk_ahds);
+
+		if (status)
+			break;
+
+		/* advance buffer past this record for next time around */
+		buf += record->len;
+		len -= record->len;
+	}
+
+	if (status)
+		ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, "BAD Recv Trailer",
+				orig_buf, orig_len);
+
+	return status;
+}
+
+static int htc_proc_rxhdr(struct htc_target *target,
+			  struct htc_packet *packet,
+			  u32 *next_lkahds, int *n_lkahds)
+{
+	int status = 0;
+	u16 payload_len;
+	u32 lk_ahd;
+	struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf;
+
+	if (n_lkahds != NULL)
+		*n_lkahds = 0;
+
+	ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, "HTC Recv PKT", packet->buf,
+			packet->act_len);
+
+	/*
+	 * NOTE: we cannot assume the alignment of buf, so we use the safe
+	 * macros to retrieve 16 bit fields.
+	 */
+	payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len));
+
+	memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd));
+
+	if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) {
+		/*
+		 * Refresh the expected header and the actual length as it
+		 * was unknown when this packet was grabbed as part of the
+		 * bundle.
+		 */
+		packet->info.rx.exp_hdr = lk_ahd;
+		packet->act_len = payload_len + HTC_HDR_LENGTH;
+
+		/* validate the actual header that was refreshed  */
+		if (packet->act_len > packet->buf_len) {
+			ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n",
+				   payload_len, lk_ahd);
+			/*
+			 * Limit this to max buffer just to print out some
+			 * of the buffer.
+			 */
+			packet->act_len = min(packet->act_len, packet->buf_len);
+			status = -ENOMEM;
+			goto fail_rx;
+		}
+
+		if (packet->endpoint != htc_hdr->eid) {
+			ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n",
+				   htc_hdr->eid, packet->endpoint);
+			status = -ENOMEM;
+			goto fail_rx;
+		}
+	}
+
+	if (lk_ahd != packet->info.rx.exp_hdr) {
+		ath6kl_err("htc_proc_rxhdr, lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n",
+			   packet, packet->info.rx.rx_flags);
+		ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, "Expected Message lk_ahd",
+				&packet->info.rx.exp_hdr, 4);
+		ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, "Current Frame Header",
+				(u8 *)&lk_ahd, sizeof(lk_ahd));
+		status = -ENOMEM;
+		goto fail_rx;
+	}
+
+	if (htc_hdr->flags & HTC_FLG_RX_TRAILER) {
+		if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) ||
+		    htc_hdr->ctrl[0] > payload_len) {
+			ath6kl_err("htc_proc_rxhdr, invalid hdr (payload len should be :%d, CB[0] is:%d)\n",
+				   payload_len, htc_hdr->ctrl[0]);
+			status = -ENOMEM;
+			goto fail_rx;
+		}
+
+		if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) {
+			next_lkahds = NULL;
+			n_lkahds = NULL;
+		}
+
+		status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH
+					  + payload_len - htc_hdr->ctrl[0],
+					  htc_hdr->ctrl[0], next_lkahds,
+					   n_lkahds, packet->endpoint);
+
+		if (status)
+			goto fail_rx;
+
+		packet->act_len -= htc_hdr->ctrl[0];
+	}
+
+	packet->buf += HTC_HDR_LENGTH;
+	packet->act_len -= HTC_HDR_LENGTH;
+
+fail_rx:
+	if (status)
+		ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, "BAD HTC Recv PKT",
+				packet->buf,
+				packet->act_len < 256 ? packet->act_len : 256);
+	else {
+		if (packet->act_len > 0)
+			ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES,
+					"HTC - Application Msg",
+					packet->buf, packet->act_len);
+	}
+
+	return status;
+}
+
+static void do_rx_completion(struct htc_endpoint *endpoint,
+			     struct htc_packet *packet)
+{
+		ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+			   "htc calling ep %d recv callback on packet 0x%p\n",
+			   endpoint->eid, packet);
+		endpoint->ep_cb.rx(endpoint->target, packet);
+}
+
+static int htc_issue_rxpkt_bundle(struct htc_target *target,
+				  struct list_head *rxq,
+				  struct list_head *sync_compq,
+				  int *n_pkt_fetched, bool part_bundle)
+{
+	struct hif_scatter_req *scat_req;
+	struct htc_packet *packet;
+	int rem_space = target->max_rx_bndl_sz;
+	int n_scat_pkt, status = 0, i, len;
+
+	n_scat_pkt = get_queue_depth(rxq);
+	n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max);
+
+	if ((get_queue_depth(rxq) - n_scat_pkt) > 0) {
+		/*
+		 * We were forced to split this bundle receive operation
+		 * all packets in this partial bundle must have their
+		 * lookaheads ignored.
+		 */
+		part_bundle = true;
+
+		/*
+		 * This would only happen if the target ignored our max
+		 * bundle limit.
+		 */
+		ath6kl_warn("htc_issue_rxpkt_bundle : partial bundle detected num:%d , %d\n",
+			    get_queue_depth(rxq), n_scat_pkt);
+	}
+
+	len = 0;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+		"htc_issue_rxpkt_bundle (numpackets: %d , actual : %d)\n",
+		get_queue_depth(rxq), n_scat_pkt);
+
+	scat_req = hif_scatter_req_get(target->dev->ar);
+
+	if (scat_req == NULL)
+		goto fail_rx_pkt;
+
+	for (i = 0; i < n_scat_pkt; i++) {
+		int pad_len;
+
+		packet = list_first_entry(rxq, struct htc_packet, list);
+		list_del(&packet->list);
+
+		pad_len = CALC_TXRX_PADDED_LEN(target,
+						   packet->act_len);
+
+		if ((rem_space - pad_len) < 0) {
+			list_add(&packet->list, rxq);
+			break;
+		}
+
+		rem_space -= pad_len;
+
+		if (part_bundle || (i < (n_scat_pkt - 1)))
+			/*
+			 * Packet 0..n-1 cannot be checked for look-aheads
+			 * since we are fetching a bundle the last packet
+			 * however can have it's lookahead used
+			 */
+			packet->info.rx.rx_flags |=
+			    HTC_RX_PKT_IGNORE_LOOKAHEAD;
+
+		/* NOTE: 1 HTC packet per scatter entry */
+		scat_req->scat_list[i].buf = packet->buf;
+		scat_req->scat_list[i].len = pad_len;
+
+		packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE;
+
+		list_add_tail(&packet->list, sync_compq);
+
+		WARN_ON(!scat_req->scat_list[i].len);
+		len += scat_req->scat_list[i].len;
+	}
+
+	scat_req->len = len;
+	scat_req->scat_entries = i;
+
+	status = ath6kldev_submit_scat_req(target->dev, scat_req, true);
+
+	if (!status)
+		*n_pkt_fetched = i;
+
+	/* free scatter request */
+	hif_scatter_req_add(target->dev->ar, scat_req);
+
+fail_rx_pkt:
+
+	return status;
+}
+
+static int htc_proc_fetched_rxpkts(struct htc_target *target,
+				   struct list_head *comp_pktq, u32 lk_ahds[],
+				   int *n_lk_ahd)
+{
+	struct htc_packet *packet, *tmp_pkt;
+	struct htc_endpoint *ep;
+	int status = 0;
+
+	list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) {
+		list_del(&packet->list);
+		ep = &target->endpoint[packet->endpoint];
+
+		/* process header for each of the recv packet */
+		status = htc_proc_rxhdr(target, packet, lk_ahds, n_lk_ahd);
+		if (status)
+			return status;
+
+		if (list_empty(comp_pktq)) {
+			/*
+			 * Last packet's more packet flag is set
+			 * based on the lookahead.
+			 */
+			if (*n_lk_ahd > 0)
+				set_rxpkt_indication_flag(lk_ahds[0],
+							  ep, packet);
+		} else
+			/*
+			 * Packets in a bundle automatically have
+			 * this flag set.
+			 */
+			packet->info.rx.indicat_flags |=
+				HTC_RX_FLAGS_INDICATE_MORE_PKTS;
+
+		htc_update_rx_stats(ep, *n_lk_ahd);
+
+		if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE)
+			ep->ep_st.rx_bundl += 1;
+
+		do_rx_completion(ep, packet);
+	}
+
+	return status;
+}
+
+static int htc_fetch_rxpkts(struct htc_target *target,
+			    struct list_head *rx_pktq,
+			    struct list_head *comp_pktq)
+{
+	int fetched_pkts;
+	bool part_bundle = false;
+	int status = 0;
+
+	/* now go fetch the list of HTC packets */
+	while (!list_empty(rx_pktq)) {
+		fetched_pkts = 0;
+
+		if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) {
+			/*
+			 * There are enough packets to attempt a
+			 * bundle transfer and recv bundling is
+			 * allowed.
+			 */
+			status = htc_issue_rxpkt_bundle(target, rx_pktq,
+							comp_pktq,
+							&fetched_pkts,
+							part_bundle);
+			if (status)
+				return status;
+
+			if (!list_empty(rx_pktq))
+				part_bundle = true;
+		}
+
+		if (!fetched_pkts) {
+			struct htc_packet *packet;
+
+			packet = list_first_entry(rx_pktq, struct htc_packet,
+						   list);
+
+			list_del(&packet->list);
+
+			/* fully synchronous */
+			packet->completion = NULL;
+
+			if (!list_empty(rx_pktq))
+				/*
+				 * look_aheads in all packet
+				 * except the last one in the
+				 * bundle must be ignored
+				 */
+				packet->info.rx.rx_flags |=
+					HTC_RX_PKT_IGNORE_LOOKAHEAD;
+
+			/* go fetch the packet */
+			status = dev_rx_pkt(target, packet, packet->act_len);
+			if (status)
+				return status;
+
+			list_add_tail(&packet->list, comp_pktq);
+		}
+	}
+
+	return status;
+}
+
+int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
+				     u32 msg_look_ahead[], int *num_pkts)
+{
+	struct htc_packet *packets, *tmp_pkt;
+	struct htc_endpoint *endpoint;
+	struct list_head rx_pktq, comp_pktq;
+	int status = 0;
+	u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE];
+	int num_look_ahead = 1;
+	enum htc_endpoint_id id;
+	int n_fetched = 0;
+
+	*num_pkts = 0;
+
+	/*
+	 * On first entry copy the look_aheads into our temp array for
+	 * processing
+	 */
+	memcpy(look_aheads, msg_look_ahead, sizeof(look_aheads));
+
+	while (true) {
+
+		/*
+		 * First lookahead sets the expected endpoint IDs for all
+		 * packets in a bundle.
+		 */
+		id = ((struct htc_frame_hdr *)&look_aheads[0])->eid;
+		endpoint = &target->endpoint[id];
+
+		if (id >= ENDPOINT_MAX) {
+			ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n",
+				   id);
+			status = -ENOMEM;
+			break;
+		}
+
+		INIT_LIST_HEAD(&rx_pktq);
+		INIT_LIST_HEAD(&comp_pktq);
+
+		/*
+		 * Try to allocate as many HTC RX packets indicated by the
+		 * look_aheads.
+		 */
+		status = alloc_and_prep_rxpkts(target, look_aheads,
+					       num_look_ahead, endpoint,
+					       &rx_pktq);
+		if (status)
+			break;
+
+		if (get_queue_depth(&rx_pktq) >= 2)
+			/*
+			 * A recv bundle was detected, force IRQ status
+			 * re-check again
+			 */
+			target->chk_irq_status_cnt = 1;
+
+		n_fetched += get_queue_depth(&rx_pktq);
+
+		num_look_ahead = 0;
+
+		status = htc_fetch_rxpkts(target, &rx_pktq, &comp_pktq);
+
+		if (!status)
+			chk_rx_water_mark(endpoint);
+
+		/* Process fetched packets */
+		status = htc_proc_fetched_rxpkts(target, &comp_pktq,
+						 look_aheads, &num_look_ahead);
+
+		if (!num_look_ahead || status)
+			break;
+
+		/*
+		 * For SYNCH processing, if we get here, we are running
+		 * through the loop again due to a detected lookahead. Set
+		 * flag that we should re-check IRQ status registers again
+		 * before leaving IRQ processing, this can net better
+		 * performance in high throughput situations.
+		 */
+		target->chk_irq_status_cnt = 1;
+	}
+
+	if (status) {
+		ath6kl_err("failed to get pending recv messages: %d\n",
+			   status);
+		/*
+		 * Cleanup any packets we allocated but didn't use to
+		 * actually fetch any packets.
+		 */
+		list_for_each_entry_safe(packets, tmp_pkt, &rx_pktq, list) {
+			list_del(&packets->list);
+			htc_reclaim_rxbuf(target, packets,
+					&target->endpoint[packets->endpoint]);
+		}
+
+		/* cleanup any packets in sync completion queue */
+		list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) {
+			list_del(&packets->list);
+			htc_reclaim_rxbuf(target, packets,
+					  &target->endpoint[packets->endpoint]);
+		}
+
+		if (target->htc_flags & HTC_OP_STATE_STOPPING) {
+			ath6kl_warn("host is going to stop blocking receiver for htc_stop\n");
+			ath6kldev_rx_control(target->dev, false);
+		}
+	}
+
+	/*
+	 * Before leaving, check to see if host ran out of buffers and
+	 * needs to stop the receiver.
+	 */
+	if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
+		ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n");
+		ath6kldev_rx_control(target->dev, false);
+	}
+	*num_pkts = n_fetched;
+
+	return status;
+}
+
+/*
+ * Synchronously wait for a control message from the target,
+ * This function is used at initialization time ONLY.  At init messages
+ * on ENDPOINT 0 are expected.
+ */
+static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target)
+{
+	struct htc_packet *packet = NULL;
+	struct htc_frame_hdr *htc_hdr;
+	u32 look_ahead;
+
+	if (ath6kldev_poll_mboxmsg_rx(target->dev, &look_ahead,
+			       HTC_TARGET_RESPONSE_TIMEOUT))
+		return NULL;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+		"htc_wait_for_ctrl_msg: look_ahead : 0x%X\n", look_ahead);
+
+	htc_hdr = (struct htc_frame_hdr *)&look_ahead;
+
+	if (htc_hdr->eid != ENDPOINT_0)
+		return NULL;
+
+	packet = htc_get_control_buf(target, false);
+
+	if (!packet)
+		return NULL;
+
+	packet->info.rx.rx_flags = 0;
+	packet->info.rx.exp_hdr = look_ahead;
+	packet->act_len = le16_to_cpu(htc_hdr->payld_len) + HTC_HDR_LENGTH;
+
+	if (packet->act_len > packet->buf_len)
+		goto fail_ctrl_rx;
+
+	/* we want synchronous operation */
+	packet->completion = NULL;
+
+	/* get the message from the device, this will block */
+	if (dev_rx_pkt(target, packet, packet->act_len))
+		goto fail_ctrl_rx;
+
+	/* process receive header */
+	packet->status = htc_proc_rxhdr(target, packet, NULL, NULL);
+
+	if (packet->status) {
+		ath6kl_err("htc_wait_for_ctrl_msg, htc_proc_rxhdr failed (status = %d)\n",
+			   packet->status);
+		goto fail_ctrl_rx;
+	}
+
+	return packet;
+
+fail_ctrl_rx:
+	if (packet != NULL) {
+		htc_rxpkt_reset(packet);
+		reclaim_rx_ctrl_buf(target, packet);
+	}
+
+	return NULL;
+}
+
+int ath6kl_htc_add_rxbuf_multiple(struct htc_target *target,
+				  struct list_head *pkt_queue)
+{
+	struct htc_endpoint *endpoint;
+	struct htc_packet *first_pkt;
+	bool rx_unblock = false;
+	int status = 0, depth;
+
+	if (list_empty(pkt_queue))
+		return -ENOMEM;
+
+	first_pkt = list_first_entry(pkt_queue, struct htc_packet, list);
+
+	if (first_pkt->endpoint >= ENDPOINT_MAX)
+		return status;
+
+	depth = get_queue_depth(pkt_queue);
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+		"htc_add_rxbuf_multiple: ep id: %d, cnt:%d, len: %d\n",
+		first_pkt->endpoint, depth, first_pkt->buf_len);
+
+	endpoint = &target->endpoint[first_pkt->endpoint];
+
+	if (target->htc_flags & HTC_OP_STATE_STOPPING) {
+		struct htc_packet *packet, *tmp_pkt;
+
+		/* walk through queue and mark each one canceled */
+		list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) {
+			packet->status = -ECANCELED;
+			list_del(&packet->list);
+			do_rx_completion(endpoint, packet);
+		}
+
+		return status;
+	}
+
+	spin_lock_bh(&target->rx_lock);
+
+	list_splice_tail_init(pkt_queue, &endpoint->rx_bufq);
+
+	/* check if we are blocked waiting for a new buffer */
+	if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
+		if (target->ep_waiting == first_pkt->endpoint) {
+			ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+				"receiver was blocked on ep:%d, unblocking.\n",
+				target->ep_waiting);
+			target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS;
+			target->ep_waiting = ENDPOINT_MAX;
+			rx_unblock = true;
+		}
+	}
+
+	spin_unlock_bh(&target->rx_lock);
+
+	if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING))
+		/* TODO : implement a buffer threshold count? */
+		ath6kldev_rx_control(target->dev, true);
+
+	return status;
+}
+
+void ath6kl_htc_flush_rx_buf(struct htc_target *target)
+{
+	struct htc_endpoint *endpoint;
+	struct htc_packet *packet, *tmp_pkt;
+	int i;
+
+	for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
+		endpoint = &target->endpoint[i];
+		if (!endpoint->svc_id)
+			/* not in use.. */
+			continue;
+
+		spin_lock_bh(&target->rx_lock);
+		list_for_each_entry_safe(packet, tmp_pkt,
+					 &endpoint->rx_bufq, list) {
+			list_del(&packet->list);
+			spin_unlock_bh(&target->rx_lock);
+			ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+				   "flushing rx pkt:0x%p, len:%d, ep:%d\n",
+				   packet, packet->buf_len,
+				   packet->endpoint);
+			dev_kfree_skb(packet->pkt_cntxt);
+			spin_lock_bh(&target->rx_lock);
+		}
+		spin_unlock_bh(&target->rx_lock);
+	}
+}
+
+int ath6kl_htc_conn_service(struct htc_target *target,
+			    struct htc_service_connect_req *conn_req,
+			    struct htc_service_connect_resp *conn_resp)
+{
+	struct htc_packet *rx_pkt = NULL;
+	struct htc_packet *tx_pkt = NULL;
+	struct htc_conn_service_resp *resp_msg;
+	struct htc_conn_service_msg *conn_msg;
+	struct htc_endpoint *endpoint;
+	enum htc_endpoint_id assigned_ep = ENDPOINT_MAX;
+	unsigned int max_msg_sz = 0;
+	int status = 0;
+
+	ath6kl_dbg(ATH6KL_DBG_TRC,
+		   "htc_conn_service, target:0x%p service id:0x%X\n",
+		   target, conn_req->svc_id);
+
+	if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) {
+		/* special case for pseudo control service */
+		assigned_ep = ENDPOINT_0;
+		max_msg_sz = HTC_MAX_CTRL_MSG_LEN;
+	} else {
+		/* allocate a packet to send to the target */
+		tx_pkt = htc_get_control_buf(target, true);
+
+		if (!tx_pkt)
+			return -ENOMEM;
+
+		conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf;
+		memset(conn_msg, 0, sizeof(*conn_msg));
+		conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID);
+		conn_msg->svc_id = cpu_to_le16(conn_req->svc_id);
+		conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags);
+
+		set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg,
+				 sizeof(*conn_msg) + conn_msg->svc_meta_len,
+				 ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
+
+		/* we want synchronous operation */
+		tx_pkt->completion = NULL;
+		htc_prep_send_pkt(tx_pkt, 0, 0, 0);
+		status = htc_issue_send(target, tx_pkt);
+
+		if (status)
+			goto fail_tx;
+
+		/* wait for response */
+		rx_pkt = htc_wait_for_ctrl_msg(target);
+
+		if (!rx_pkt) {
+			status = -ENOMEM;
+			goto fail_tx;
+		}
+
+		resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf;
+
+		if ((le16_to_cpu(resp_msg->msg_id) != HTC_MSG_CONN_SVC_RESP_ID)
+		    || (rx_pkt->act_len < sizeof(*resp_msg))) {
+			status = -ENOMEM;
+			goto fail_tx;
+		}
+
+		conn_resp->resp_code = resp_msg->status;
+		/* check response status */
+		if (resp_msg->status != HTC_SERVICE_SUCCESS) {
+			ath6kl_err("target failed service 0x%X connect request (status:%d)\n",
+				   resp_msg->svc_id, resp_msg->status);
+			status = -ENOMEM;
+			goto fail_tx;
+		}
+
+		assigned_ep = (enum htc_endpoint_id)resp_msg->eid;
+		max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz);
+	}
+
+	if (assigned_ep >= ENDPOINT_MAX || !max_msg_sz) {
+		status = -ENOMEM;
+		goto fail_tx;
+	}
+
+	endpoint = &target->endpoint[assigned_ep];
+	endpoint->eid = assigned_ep;
+	if (endpoint->svc_id) {
+		status = -ENOMEM;
+		goto fail_tx;
+	}
+
+	/* return assigned endpoint to caller */
+	conn_resp->endpoint = assigned_ep;
+	conn_resp->len_max = max_msg_sz;
+
+	/* setup the endpoint */
+
+	/* this marks the endpoint in use */
+	endpoint->svc_id = conn_req->svc_id;
+
+	endpoint->max_txq_depth = conn_req->max_txq_depth;
+	endpoint->len_max = max_msg_sz;
+	endpoint->ep_cb = conn_req->ep_cb;
+	endpoint->cred_dist.svc_id = conn_req->svc_id;
+	endpoint->cred_dist.htc_rsvd = endpoint;
+	endpoint->cred_dist.endpoint = assigned_ep;
+	endpoint->cred_dist.cred_sz = target->tgt_cred_sz;
+
+	if (conn_req->max_rxmsg_sz) {
+		/*
+		 * Override cred_per_msg calculation, this optimizes
+		 * the credit-low indications since the host will actually
+		 * issue smaller messages in the Send path.
+		 */
+		if (conn_req->max_rxmsg_sz > max_msg_sz) {
+			status = -ENOMEM;
+			goto fail_tx;
+		}
+		endpoint->cred_dist.cred_per_msg =
+		    conn_req->max_rxmsg_sz / target->tgt_cred_sz;
+	} else
+		endpoint->cred_dist.cred_per_msg =
+		    max_msg_sz / target->tgt_cred_sz;
+
+	if (!endpoint->cred_dist.cred_per_msg)
+		endpoint->cred_dist.cred_per_msg = 1;
+
+	/* save local connection flags */
+	endpoint->conn_flags = conn_req->flags;
+
+fail_tx:
+	if (tx_pkt)
+		htc_reclaim_txctrl_buf(target, tx_pkt);
+
+	if (rx_pkt) {
+		htc_rxpkt_reset(rx_pkt);
+		reclaim_rx_ctrl_buf(target, rx_pkt);
+	}
+
+	return status;
+}
+
+static void reset_ep_state(struct htc_target *target)
+{
+	struct htc_endpoint *endpoint;
+	int i;
+
+	for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
+		endpoint = &target->endpoint[i];
+		memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist));
+		endpoint->svc_id = 0;
+		endpoint->len_max = 0;
+		endpoint->max_txq_depth = 0;
+		memset(&endpoint->ep_st, 0,
+		       sizeof(endpoint->ep_st));
+		INIT_LIST_HEAD(&endpoint->rx_bufq);
+		INIT_LIST_HEAD(&endpoint->txq);
+		endpoint->target = target;
+	}
+
+	/* reset distribution list */
+	INIT_LIST_HEAD(&target->cred_dist_list);
+}
+
+int ath6kl_htc_get_rxbuf_num(struct htc_target *target,
+			     enum htc_endpoint_id endpoint)
+{
+	int num;
+
+	spin_lock_bh(&target->rx_lock);
+	num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq));
+	spin_unlock_bh(&target->rx_lock);
+	return num;
+}
+
+static void htc_setup_msg_bndl(struct htc_target *target)
+{
+	/* limit what HTC can handle */
+	target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE,
+				       target->msg_per_bndl_max);
+
+	if (ath6kl_hif_enable_scatter(target->dev->ar)) {
+		target->msg_per_bndl_max = 0;
+		return;
+	}
+
+	/* limit bundle what the device layer can handle */
+	target->msg_per_bndl_max = min(target->max_scat_entries,
+				       target->msg_per_bndl_max);
+
+	ath6kl_dbg(ATH6KL_DBG_TRC,
+		   "htc bundling allowed. max msg per htc bundle: %d\n",
+		   target->msg_per_bndl_max);
+
+	/* Max rx bundle size is limited by the max tx bundle size */
+	target->max_rx_bndl_sz = target->max_xfer_szper_scatreq;
+	/* Max tx bundle size if limited by the extended mbox address range */
+	target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH,
+				     target->max_xfer_szper_scatreq);
+
+	ath6kl_dbg(ATH6KL_DBG_ANY, "max recv: %d max send: %d\n",
+		   target->max_rx_bndl_sz, target->max_tx_bndl_sz);
+
+	if (target->max_tx_bndl_sz)
+		target->tx_bndl_enable = true;
+
+	if (target->max_rx_bndl_sz)
+		target->rx_bndl_enable = true;
+
+	if ((target->tgt_cred_sz % target->block_sz) != 0) {
+		ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n",
+			    target->tgt_cred_sz);
+
+		/*
+		 * Disallow send bundling since the credit size is
+		 * not aligned to a block size the I/O block
+		 * padding will spill into the next credit buffer
+		 * which is fatal.
+		 */
+		target->tx_bndl_enable = false;
+	}
+}
+
+int ath6kl_htc_wait_target(struct htc_target *target)
+{
+	struct htc_packet *packet = NULL;
+	struct htc_ready_ext_msg *rdy_msg;
+	struct htc_service_connect_req connect;
+	struct htc_service_connect_resp resp;
+	int status;
+
+	/* we should be getting 1 control message that the target is ready */
+	packet = htc_wait_for_ctrl_msg(target);
+
+	if (!packet)
+		return -ENOMEM;
+
+	/* we controlled the buffer creation so it's properly aligned */
+	rdy_msg = (struct htc_ready_ext_msg *)packet->buf;
+
+	if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) ||
+	    (packet->act_len < sizeof(struct htc_ready_msg))) {
+		status = -ENOMEM;
+		goto fail_wait_target;
+	}
+
+	if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) {
+		status = -ENOMEM;
+		goto fail_wait_target;
+	}
+
+	target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt);
+	target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz);
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+		   "target ready: credits: %d credit size: %d\n",
+		   target->tgt_creds, target->tgt_cred_sz);
+
+	/* check if this is an extended ready message */
+	if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) {
+		/* this is an extended message */
+		target->htc_tgt_ver = rdy_msg->htc_ver;
+		target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl;
+	} else {
+		/* legacy */
+		target->htc_tgt_ver = HTC_VERSION_2P0;
+		target->msg_per_bndl_max = 0;
+	}
+
+	ath6kl_dbg(ATH6KL_DBG_TRC, "using htc protocol version : %s (%d)\n",
+		  (target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1",
+		  target->htc_tgt_ver);
+
+	if (target->msg_per_bndl_max > 0)
+		htc_setup_msg_bndl(target);
+
+	/* setup our pseudo HTC control endpoint connection */
+	memset(&connect, 0, sizeof(connect));
+	memset(&resp, 0, sizeof(resp));
+	connect.ep_cb.rx = htc_ctrl_rx;
+	connect.ep_cb.rx_refill = NULL;
+	connect.ep_cb.tx_full = NULL;
+	connect.max_txq_depth = NUM_CONTROL_BUFFERS;
+	connect.svc_id = HTC_CTRL_RSVD_SVC;
+
+	/* connect fake service */
+	status = ath6kl_htc_conn_service((void *)target, &connect, &resp);
+
+	if (status)
+		ath6kl_hif_cleanup_scatter(target->dev->ar);
+
+fail_wait_target:
+	if (packet) {
+		htc_rxpkt_reset(packet);
+		reclaim_rx_ctrl_buf(target, packet);
+	}
+
+	return status;
+}
+
+/*
+ * Start HTC, enable interrupts and let the target know
+ * host has finished setup.
+ */
+int ath6kl_htc_start(struct htc_target *target)
+{
+	struct htc_packet *packet;
+	int status;
+
+	/* Disable interrupts at the chip level */
+	ath6kldev_disable_intrs(target->dev);
+
+	target->htc_flags = 0;
+	target->rx_st_flags = 0;
+
+	/* Push control receive buffers into htc control endpoint */
+	while ((packet = htc_get_control_buf(target, false)) != NULL) {
+		status = htc_add_rxbuf(target, packet);
+		if (status)
+			return status;
+	}
+
+	/* NOTE: the first entry in the distribution list is ENDPOINT_0 */
+	ath6k_credit_init(target->cred_dist_cntxt, &target->cred_dist_list,
+			  target->tgt_creds);
+
+	dump_cred_dist_stats(target);
+
+	/* Indicate to the target of the setup completion */
+	status = htc_setup_tx_complete(target);
+
+	if (status)
+		return status;
+
+	/* unmask interrupts */
+	status = ath6kldev_unmask_intrs(target->dev);
+
+	if (status)
+		ath6kl_htc_stop(target);
+
+	return status;
+}
+
+/* htc_stop: stop interrupt reception, and flush all queued buffers */
+void ath6kl_htc_stop(struct htc_target *target)
+{
+	spin_lock_bh(&target->htc_lock);
+	target->htc_flags |= HTC_OP_STATE_STOPPING;
+	spin_unlock_bh(&target->htc_lock);
+
+	/*
+	 * Masking interrupts is a synchronous operation, when this
+	 * function returns all pending HIF I/O has completed, we can
+	 * safely flush the queues.
+	 */
+	ath6kldev_mask_intrs(target->dev);
+
+	ath6kl_htc_flush_txep_all(target);
+
+	ath6kl_htc_flush_rx_buf(target);
+
+	reset_ep_state(target);
+}
+
+void *ath6kl_htc_create(struct ath6kl *ar)
+{
+	struct htc_target *target = NULL;
+	struct htc_packet *packet;
+	int status = 0, i = 0;
+	u32 block_size, ctrl_bufsz;
+
+	target = kzalloc(sizeof(*target), GFP_KERNEL);
+	if (!target) {
+		ath6kl_err("unable to allocate memory\n");
+		return NULL;
+	}
+
+	target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL);
+	if (!target->dev) {
+		ath6kl_err("unable to allocate memory\n");
+		status = -ENOMEM;
+		goto fail_create_htc;
+	}
+
+	spin_lock_init(&target->htc_lock);
+	spin_lock_init(&target->rx_lock);
+	spin_lock_init(&target->tx_lock);
+
+	INIT_LIST_HEAD(&target->free_ctrl_txbuf);
+	INIT_LIST_HEAD(&target->free_ctrl_rxbuf);
+	INIT_LIST_HEAD(&target->cred_dist_list);
+
+	target->dev->ar = ar;
+	target->dev->htc_cnxt = target;
+	target->ep_waiting = ENDPOINT_MAX;
+
+	reset_ep_state(target);
+
+	status = ath6kldev_setup(target->dev);
+
+	if (status)
+		goto fail_create_htc;
+
+	block_size = ar->mbox_info.block_size;
+
+	ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ?
+		      (block_size + HTC_HDR_LENGTH) :
+		      (HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH);
+
+	for (i = 0; i < NUM_CONTROL_BUFFERS; i++) {
+		packet = kzalloc(sizeof(*packet), GFP_KERNEL);
+		if (!packet)
+			break;
+
+		packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL);
+		if (!packet->buf_start) {
+			kfree(packet);
+			break;
+		}
+
+		packet->buf_len = ctrl_bufsz;
+		if (i < NUM_CONTROL_RX_BUFFERS) {
+			packet->act_len = 0;
+			packet->buf = packet->buf_start;
+			packet->endpoint = ENDPOINT_0;
+			list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
+		} else
+			list_add_tail(&packet->list, &target->free_ctrl_txbuf);
+	}
+
+fail_create_htc:
+	if (i != NUM_CONTROL_BUFFERS || status) {
+		if (target) {
+			ath6kl_htc_cleanup(target);
+			target = NULL;
+		}
+	}
+
+	return target;
+}
+
+/* cleanup the HTC instance */
+void ath6kl_htc_cleanup(struct htc_target *target)
+{
+	struct htc_packet *packet, *tmp_packet;
+
+	ath6kl_hif_cleanup_scatter(target->dev->ar);
+
+	list_for_each_entry_safe(packet, tmp_packet,
+			&target->free_ctrl_txbuf, list) {
+		list_del(&packet->list);
+		kfree(packet->buf_start);
+		kfree(packet);
+	}
+
+	list_for_each_entry_safe(packet, tmp_packet,
+			&target->free_ctrl_rxbuf, list) {
+		list_del(&packet->list);
+		kfree(packet->buf_start);
+		kfree(packet);
+	}
+
+	kfree(target->dev);
+	kfree(target);
+}