Adding upstream version 20200122.upstream/20200122

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1211 insertions, 0 deletions

diff --git a/carl9170fw/carlfw/src/wlan.c b/carl9170fw/carlfw/src/wlan.c
new file mode 100644
index 0000000..d3328d6
--- /dev/null
+++ b/carl9170fw/carlfw/src/wlan.c
@@ -0,0 +1,1211 @@
+/*
+ * carl9170 firmware - used by the ar9170 wireless device
+ *
+ * Interface to the WLAN part of the chip
+ *
+ * Copyright (c) 2000-2005 ZyDAS Technology Corporation
+ * Copyright (c) 2007-2009 Atheros Communications, Inc.
+ * Copyright	2009	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2009-2011	Christian Lamparter <chunkeey@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "carl9170.h"
+#include "shared/phy.h"
+#include "hostif.h"
+#include "timer.h"
+#include "wl.h"
+#include "printf.h"
+#include "rf.h"
+#include "linux/ieee80211.h"
+#include "wol.h"
+
+static void wlan_txunstuck(unsigned int queue)
+{
+	set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1);
+}
+
+#ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
+static void wlan_txupdate(unsigned int queue)
+{
+	set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head));
+}
+
+static void wlan_dma_bump(unsigned int qidx)
+{
+	unsigned int offset = qidx;
+	uint32_t status, trigger;
+
+	status = get(AR9170_MAC_REG_DMA_STATUS) >> 12;
+	trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12;
+
+	while (offset != 0) {
+		status >>= 4;
+		trigger >>= 4;
+		offset--;
+	}
+
+	status &= 0xf;
+	trigger &= 0xf;
+
+	if ((trigger == 0xa) && (status == 0x8)) {
+		DBG("UNSTUCK");
+		wlan_txunstuck(qidx);
+	} else {
+		DBG("UPDATE");
+		wlan_txupdate(qidx);
+	}
+}
+#endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
+
+#ifdef CONFIG_CARL9170FW_DEBUG
+static void wlan_dump_queue(unsigned int qidx)
+{
+
+	struct dma_desc *desc;
+	struct carl9170_tx_superframe *super;
+	int entries = 0;
+
+	__for_each_desc(desc, &fw.wlan.tx_queue[qidx]) {
+		super = get_super(desc);
+		DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc,
+		    desc->status, desc->ctrl, desc->totalLen,
+		    desc->dataSize, desc->nextAddr, desc->lastAddr);
+
+		DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x",
+		    super->s.cookie, super->s.cnt, super->s.rix,
+		    super->f.hdr.length, super->f.hdr.mac.set,
+		    (unsigned int) le32_to_cpu(super->f.hdr.phy.set),
+		    super->f.data.i3e.frame_control);
+
+		entries++;
+	}
+
+	desc = get_wlan_txq_addr(qidx);
+
+	DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p",
+	    qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]),
+	    fw.wlan.tx_queue[qidx].head,
+	    desc, fw.wlan.tx_queue[qidx].terminator);
+
+	DBG("HW: t:%x s:%x ac:%x c:%x",
+	    (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER),
+	    (unsigned int) get(AR9170_MAC_REG_DMA_STATUS),
+	    (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT),
+	    (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR));
+}
+#endif /* CONFIG_CARL9170FW_DEBUG */
+
+static void wlan_send_buffered_tx_status(void)
+{
+	unsigned int len;
+
+	while (fw.wlan.tx_status_pending) {
+		len = min((unsigned int)fw.wlan.tx_status_pending,
+			  CARL9170_RSP_TX_STATUS_NUM);
+		len = min(len, CARL9170_TX_STATUS_NUM -	fw.wlan.tx_status_head_idx);
+
+		/*
+		 * rather than memcpy each individual request into a large buffer,
+		 * we _splice_ them all together.
+		 *
+		 * The only downside is however that we have to be careful around
+		 * the edges of the tx_status_cache.
+		 *
+		 * Note:
+		 * Each tx_status is about 2 bytes. However every command package
+		 * must have a size which is a multiple of 4.
+		 */
+
+		send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3,
+				 CARL9170_RSP_TXCOMP, len, (void *)
+				 &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]);
+
+		fw.wlan.tx_status_pending -= len;
+		fw.wlan.tx_status_head_idx += len;
+		fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM;
+	}
+}
+
+static struct carl9170_tx_status *wlan_get_tx_status_buffer(void)
+{
+	struct carl9170_tx_status *tmp;
+
+	tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++];
+	fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM;
+
+	if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM)
+		wlan_send_buffered_tx_status();
+
+	fw.wlan.tx_status_pending++;
+
+	return tmp;
+}
+
+/* generate _aggregated_ tx_status for the host */
+void wlan_tx_complete(struct carl9170_tx_superframe *super,
+		      bool txs)
+{
+	struct carl9170_tx_status *status;
+
+	status = wlan_get_tx_status_buffer();
+
+	/*
+	 * The *unique* cookie and AC_ID is used by the driver for
+	 * frame lookup.
+	 */
+	status->cookie = super->s.cookie;
+	status->queue = super->s.queue;
+	super->s.cookie = 0;
+
+	/*
+	 * This field holds the number of tries of the rate in
+	 * the rate index field (rix).
+	 */
+	status->rix = super->s.rix;
+	status->tries = super->s.cnt;
+	status->success = (txs) ? 1 : 0;
+}
+
+static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super)
+{
+	/* check if this was the last possible retry with this rate */
+	if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) {
+		/* end of the road - indicate tx failure */
+		if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES))
+			return false;
+
+		/* check if there are alternative rates available */
+		if (!super->s.rr[super->s.rix].set)
+			return false;
+
+		/* try next retry rate */
+		super->f.hdr.phy.set = super->s.rr[super->s.rix].set;
+
+		/* finally - mark the old rate as USED */
+		super->s.rix++;
+
+		/* update MAC flags */
+		super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot;
+		super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu;
+
+		/* reinitialize try counter */
+		super->s.cnt = 1;
+	} else {
+		/* just increase retry counter */
+		super->s.cnt++;
+	}
+
+	return true;
+}
+
+static inline u16 get_tid(struct ieee80211_hdr *hdr)
+{
+	return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
+}
+
+/* This function will only work on uint32_t-aligned pointers! */
+static bool same_hdr(const void *_d0, const void *_d1)
+{
+	const uint32_t *d0 = _d0;
+	const uint32_t *d1 = _d1;
+
+	/* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
+	return !((d0[0] ^ d1[0]) |			/* FC + DU */
+		 (d0[1] ^ d1[1]) |			/* addr1 */
+		 (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) |	/* addr2 + addr3 */
+		 (d0[4] ^ d1[4]));			/* addr3 */
+}
+
+static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b)
+{
+	return (get_tid(a) == get_tid(b)) || same_hdr(a, b);
+}
+
+static void wlan_tx_ampdu_reset(unsigned int qidx)
+{
+	fw.wlan.ampdu_prev[qidx] = NULL;
+}
+
+static void wlan_tx_ampdu_end(unsigned int qidx)
+{
+	struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
+
+	if (ht_prev)
+		ht_prev->f.hdr.mac.ba_end = 1;
+
+	wlan_tx_ampdu_reset(qidx);
+}
+
+static void wlan_tx_ampdu(struct carl9170_tx_superframe *super)
+{
+	unsigned int qidx = super->s.queue;
+	struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
+
+	if (super->f.hdr.mac.ampdu) {
+		if (ht_prev &&
+		    !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e))
+			ht_prev->f.hdr.mac.ba_end = 1;
+		else
+			super->f.hdr.mac.ba_end = 0;
+
+		fw.wlan.ampdu_prev[qidx] = super;
+	} else {
+		wlan_tx_ampdu_end(qidx);
+	}
+}
+
+/* for all tries */
+static void __wlan_tx(struct dma_desc *desc)
+{
+	struct carl9170_tx_superframe *super = get_super(desc);
+
+	if (unlikely(super->s.fill_in_tsf)) {
+		struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
+		uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
+
+		/*
+		 * Truth be told: this is a hack.
+		 *
+		 * The *real* TSF is definitely going to be higher/older.
+		 * But this hardware emulation code is head and shoulders
+		 * above anything a driver can possibly do.
+		 *
+		 * (even, if it's got an accurate atomic clock source).
+		 */
+
+		read_tsf(tsf);
+	}
+
+	wlan_tx_ampdu(super);
+
+#ifdef CONFIG_CARL9170FW_DEBUG
+	BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
+#endif /* CONFIG_CARL9170FW_DEBUG */
+
+	/* insert desc into the right queue */
+	dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
+}
+
+static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
+{
+	hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
+	hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
+
+	if (ieee80211_is_first_frag(hdr->seq_ctrl))
+		fw.wlan.sequence[vif] += 0x10;
+}
+
+/* prepares frame for the first transmission */
+static void _wlan_tx(struct dma_desc *desc)
+{
+	struct carl9170_tx_superframe *super = get_super(desc);
+
+	if (unlikely(super->s.assign_seq))
+		wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
+
+	if (unlikely(super->s.ampdu_commit_density)) {
+		set(AR9170_MAC_REG_AMPDU_DENSITY,
+		    MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
+			    get(AR9170_MAC_REG_AMPDU_DENSITY),
+			    super->s.ampdu_density));
+	}
+
+	if (unlikely(super->s.ampdu_commit_factor)) {
+		set(AR9170_MAC_REG_AMPDU_FACTOR,
+		    MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
+			    get(AR9170_MAC_REG_AMPDU_FACTOR),
+			    8 << super->s.ampdu_factor));
+	}
+}
+
+/* propagate transmission status back to the driver */
+static bool wlan_tx_status(struct dma_queue *queue,
+			   struct dma_desc *desc)
+{
+	struct carl9170_tx_superframe *super = get_super(desc);
+	unsigned int qidx = super->s.queue;
+	bool txfail = false, success;
+
+	success = true;
+
+	/* update hangcheck */
+	fw.wlan.last_super_num[qidx] = 0;
+
+	/*
+	 * Note:
+	 * There could be a corner case when the TXFAIL is set
+	 * even though the frame was properly ACKed by the peer:
+	 *   a BlockAckReq with the immediate policy will cause
+	 *   the receiving peer to produce a BlockACK unfortunately
+	 *   the MAC in this chip seems to be expecting a legacy
+	 *   ACK and marks the BAR as failed!
+	 */
+
+	if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
+		txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
+
+		/* reset retry indicator flags */
+		desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
+
+		/*
+		 * Note: wlan_tx_consume_retry will override the old
+		 * phy [CCK,OFDM, HT, BW20/40, MCS...] and mac vectors
+		 * [AMPDU,RTS/CTS,...] therefore be careful when they
+		 * are used.
+		 */
+		if (wlan_tx_consume_retry(super)) {
+			/*
+			 * retry for simple and aggregated 802.11 frames.
+			 *
+			 * Note: We must not mess up the original frame
+			 * order.
+			 */
+
+			if (!super->f.hdr.mac.ampdu) {
+				/*
+				 * 802.11 - 7.1.3.1.5.
+				 * set "Retry Field" for consecutive attempts
+				 *
+				 * Note: For AMPDU see:
+				 * 802.11n 9.9.1.6 "Retransmit Procedures"
+				 */
+				super->f.data.i3e.frame_control |=
+					cpu_to_le16(IEEE80211_FCTL_RETRY);
+			}
+
+			if (txfail) {
+				/* Normal TX Failure */
+
+				/* demise descriptor ownership back to the hardware */
+				dma_rearm(desc);
+
+				/*
+				 * And this will get the queue going again.
+				 * To understand why: you have to get the HW
+				 * specs... But sadly I never saw them.
+				 */
+				wlan_txunstuck(qidx);
+
+				/* abort cycle - this is necessary due to HW design */
+				return false;
+			} else {
+				/* (HT-) BlockACK failure */
+
+				/*
+				 * Unlink the failed attempt and put it into
+				 * the retry queue. The caller routine must
+				 * be aware of this so the frames don't get lost.
+				 */
+
+#ifndef CONFIG_CARL9170FW_DEBUG
+				dma_unlink_head(queue);
+#else /* CONFIG_CARL9170FW_DEBUG */
+				BUG_ON(dma_unlink_head(queue) != desc);
+#endif /* CONFIG_CARL9170FW_DEBUG */
+				dma_put(&fw.wlan.tx_retry, desc);
+				return true;
+			}
+		} else {
+			/* out of frame attempts - discard frame */
+			success = false;
+		}
+	}
+
+#ifndef CONFIG_CARL9170FW_DEBUG
+	dma_unlink_head(queue);
+#else /* CONFIG_CARL9170FW_DEBUG */
+	BUG_ON(dma_unlink_head(queue) != desc);
+#endif /* CONFIG_CARL9170FW_DEBUG */
+	if (txfail) {
+		/*
+		 * Issue the queue bump,
+		 * We need to do this in case this was the frame's last
+		 * possible retry attempt and it unfortunately: it failed.
+		 */
+
+		wlan_txunstuck(qidx);
+	}
+
+	unhide_super(desc);
+
+	if (unlikely(super == fw.wlan.fw_desc_data)) {
+		fw.wlan.fw_desc = desc;
+		fw.wlan.fw_desc_available = 1;
+
+		if (fw.wlan.fw_desc_callback)
+			fw.wlan.fw_desc_callback(super, success);
+
+		return true;
+	}
+
+#ifdef CONFIG_CARL9170FW_CAB_QUEUE
+	if (unlikely(super->s.cab))
+		fw.wlan.cab_queue_len[super->s.vif_id]--;
+#endif /* CONFIG_CARL9170FW_CAB_QUEUE */
+
+	wlan_tx_complete(super, success);
+
+	if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) {
+		fw.wlan.queued_bar--;
+	}
+
+	/* recycle freed descriptors */
+	dma_reclaim(&fw.pta.down_queue, desc);
+	down_trigger();
+	return true;
+}
+
+static void handle_tx_completion(void)
+{
+	struct dma_desc *desc;
+	int i;
+
+	for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
+		__while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
+			if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
+				/* termination requested. */
+				break;
+			}
+		}
+
+		wlan_tx_ampdu_reset(i);
+
+		for_each_desc(desc, &fw.wlan.tx_retry)
+			__wlan_tx(desc);
+
+		wlan_tx_ampdu_end(i);
+		if (!queue_empty(&fw.wlan.tx_queue[i]))
+			wlan_trigger(BIT(i));
+	}
+}
+
+void __hot wlan_tx(struct dma_desc *desc)
+{
+	struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
+
+	if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) {
+		fw.wlan.queued_bar++;
+	}
+
+	/* initialize rate control struct */
+	super->s.rix = 0;
+	super->s.cnt = 1;
+	hide_super(desc);
+
+#ifdef CONFIG_CARL9170FW_CAB_QUEUE
+	if (unlikely(super->s.cab)) {
+		fw.wlan.cab_queue_len[super->s.vif_id]++;
+		dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
+		return;
+	}
+#endif /* CONFIG_CARL9170FW_CAB_QUEUE */
+
+	_wlan_tx(desc);
+	__wlan_tx(desc);
+	wlan_trigger(BIT(super->s.queue));
+}
+
+void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb)
+{
+	if (!fw.wlan.fw_desc_available)
+		return;
+
+	fw.wlan.fw_desc_available = 0;
+
+	/* Format BlockAck */
+	fw.wlan.fw_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
+	fw.wlan.fw_desc->status = AR9170_OWN_BITS_SW;
+
+	fw.wlan.fw_desc->totalLen = fw.wlan.fw_desc->dataSize = super->len;
+	fw.wlan.fw_desc_data = fw.wlan.fw_desc->dataAddr = super;
+	fw.wlan.fw_desc->nextAddr = fw.wlan.fw_desc->lastAddr =
+		fw.wlan.fw_desc;
+	fw.wlan.fw_desc_callback = cb;
+	wlan_tx(fw.wlan.fw_desc);
+}
+
+static void wlan_send_buffered_ba(void)
+{
+	struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
+	struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
+	struct carl9170_bar_ctx *ctx;
+
+	if (likely(!fw.wlan.queued_ba))
+		return;
+
+	/* there's no point to continue when the ba_desc is not available. */
+	if (!fw.wlan.fw_desc_available)
+		return;
+
+	ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx];
+	fw.wlan.ba_head_idx++;
+	fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
+	fw.wlan.queued_ba--;
+
+	baf->s.len = sizeof(struct carl9170_tx_superdesc) +
+		     sizeof(struct ar9170_tx_hwdesc) +
+		     sizeof(struct ieee80211_ba);
+	baf->s.ri[0].tries = 1;
+	baf->s.cookie = 0;
+	baf->s.queue = AR9170_TXQ_VO;
+	baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
+
+	baf->f.hdr.mac.no_ack = 1;
+
+	baf->f.hdr.phy.modulation = 1; /* OFDM */
+	baf->f.hdr.phy.tx_power = 34; /* 17 dBm */
+	baf->f.hdr.phy.chains = 1;
+	baf->f.hdr.phy.mcs = AR9170_TXRX_PHY_RATE_OFDM_6M;
+
+	/* format outgoing BA */
+	ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
+	ba->duration = cpu_to_le16(0);
+
+	/* the BAR contains all necessary MACs. All we need is to swap them */
+	memcpy(ba->ra, ctx->ta, 6);
+	memcpy(ba->ta, ctx->ra, 6);
+
+	/*
+	 * Unfortunately, we cannot look into the hardware's scoreboard.
+	 * Therefore we have to proceed as described in 802.11n 9.10.7.5
+	 * and send a null BlockAck.
+	 */
+	memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
+
+	/*
+	 * Both, the original firmare and ath9k set the NO ACK flag in
+	 * the BA Ack Policy subfield.
+	 */
+	ba->control = ctx->control | cpu_to_le16(1);
+	ba->start_seq_num = ctx->start_seq_num;
+	wlan_tx_fw(&baf->s, NULL);
+}
+
+static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
+{
+	struct carl9170_bar_ctx *tmp;
+
+	tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx];
+	fw.wlan.ba_tail_idx++;
+	fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
+	if (fw.wlan.queued_ba < CONFIG_CARL9170FW_BACK_REQS_NUM)
+		fw.wlan.queued_ba++;
+
+	return tmp;
+}
+
+static void handle_bar(struct dma_desc *desc __unused, struct ieee80211_hdr *hdr,
+		       unsigned int len, unsigned int mac_err)
+{
+	struct ieee80211_bar *bar;
+	struct carl9170_bar_ctx *ctx;
+
+	if (unlikely(mac_err)) {
+		/*
+		 * This check does a number of things:
+		 * 1. checks if the frame is in good nick
+		 * 2. checks if the RA (MAC) matches
+		 */
+		return ;
+	}
+
+	if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
+		/*
+		 * Sneaky, corrupted BARs... but not with us!
+		 */
+
+		return ;
+	}
+
+	bar = (void *) hdr;
+
+	if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
+	    !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
+		/* not implemented yet */
+
+		return ;
+	}
+
+	ctx = wlan_get_bar_cache_buffer();
+
+	memcpy(ctx->ra, bar->ra, 6);
+	memcpy(ctx->ta, bar->ta, 6);
+	ctx->control = bar->control;
+	ctx->start_seq_num = bar->start_seq_num;
+}
+
+static void wlan_check_rx_overrun(void)
+{
+	uint32_t overruns, total;
+
+	fw.tally.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
+	fw.tally.rx_overrun += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
+	if (unlikely(overruns)) {
+		if (overruns == total) {
+			DBG("RX Overrun");
+			fw.wlan.mac_reset++;
+		}
+
+		wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
+	}
+}
+
+static unsigned int wlan_rx_filter(struct dma_desc *desc)
+{
+	struct ieee80211_hdr *hdr;
+	unsigned int data_len;
+	unsigned int rx_filter;
+	unsigned int mac_err;
+
+	data_len = ar9170_get_rx_mpdu_len(desc);
+	mac_err = ar9170_get_rx_macstatus_error(desc);
+
+#define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
+
+	if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
+	    desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
+	    mac_err & AR9170_RX_ERROR_BAD) {
+		/*
+		 * This frame is too damaged to do anything
+		 * useful with it.
+		 */
+
+		return CARL9170_RX_FILTER_BAD;
+	}
+
+	rx_filter = 0;
+	if (mac_err & AR9170_RX_ERROR_WRONG_RA)
+		rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
+
+	if (mac_err & AR9170_RX_ERROR_DECRYPT)
+		rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
+
+	hdr = ar9170_get_rx_i3e(desc);
+	if (likely(ieee80211_is_data(hdr->frame_control))) {
+		rx_filter |= CARL9170_RX_FILTER_DATA;
+	} else if (ieee80211_is_ctl(hdr->frame_control)) {
+		switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
+		case IEEE80211_STYPE_BACK_REQ:
+			handle_bar(desc, hdr, data_len, mac_err);
+			rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
+			break;
+		case IEEE80211_STYPE_PSPOLL:
+			rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
+			break;
+		case IEEE80211_STYPE_BACK:
+			if (fw.wlan.queued_bar) {
+				/*
+				 * Don't filter block acks when the application
+				 * has queued BARs. This is because the firmware
+				 * can't do the accouting and the application
+				 * has to sort out if the BA belongs to any BARs.
+				 */
+				break;
+			}
+			/* otherwise fall through */
+		default:
+			rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
+			break;
+		}
+	} else {
+		/* ieee80211_is_mgmt */
+		rx_filter |= CARL9170_RX_FILTER_MGMT;
+	}
+
+	if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
+		wol_rx(rx_filter, hdr, min(data_len,
+			(unsigned int)AR9170_BLOCK_SIZE));
+	}
+
+#undef AR9170_RX_ERROR_BAD
+
+	return rx_filter;
+}
+
+static void handle_rx(void)
+{
+	struct dma_desc *desc;
+
+	for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
+		if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
+			dma_put(&fw.pta.up_queue, desc);
+			up_trigger();
+		} else {
+			dma_reclaim(&fw.wlan.rx_queue, desc);
+			wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
+		}
+	}
+}
+
+#ifdef CONFIG_CARL9170FW_CAB_QUEUE
+void wlan_cab_flush_queue(const unsigned int vif)
+{
+	struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
+	struct dma_desc *desc;
+
+	/* move queued frames into the main tx queues */
+	for_each_desc(desc, cab_queue) {
+		struct carl9170_tx_superframe *super = get_super(desc);
+		if (!queue_empty(cab_queue)) {
+			/*
+			 * Set MOREDATA flag for all,
+			 * but the last queued frame.
+			 * see: 802.11-2007 11.2.1.5 f)
+			 *
+			 * This is actually the reason to why
+			 * we need to prevent the reentry.
+			 */
+
+			super->f.data.i3e.frame_control |=
+				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+		} else {
+			super->f.data.i3e.frame_control &=
+				cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
+		}
+
+		/* ready to roll! */
+		_wlan_tx(desc);
+		__wlan_tx(desc);
+		wlan_trigger(BIT(super->s.queue));
+	}
+}
+
+static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
+			       const unsigned int len)
+{
+	struct ieee80211_mgmt *mgmt = addr;
+	uint8_t *pos, *end;
+
+	pos = mgmt->u.beacon.variable;
+	end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
+	while (pos < end) {
+		if (pos + 2 + pos[1] > end)
+			return NULL;
+
+		if (pos[0] == ie)
+			return pos;
+
+		pos += pos[1] + 2;
+	}
+
+	return NULL;
+}
+
+void wlan_modify_beacon(const unsigned int vif,
+	const unsigned int addr, const unsigned int len)
+{
+	uint8_t *_ie;
+	struct ieee80211_tim_ie *ie;
+
+	_ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
+	if (likely(_ie)) {
+		ie = (struct ieee80211_tim_ie *) &_ie[2];
+
+		if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
+			/* schedule DTIM transfer */
+			fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
+		} else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
+			/* undo all chances to the beacon structure */
+			ie->bitmap_ctrl &= ~0x1;
+			fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
+		}
+
+		/* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
+		if (fw.wlan.cab_flush_trigger[vif]) {
+			/* Set the almighty Multicast Traffic Indication Bit. */
+			ie->bitmap_ctrl |= 0x1;
+		}
+	}
+
+	/*
+	 * Ideally, the sequence number should be assigned by the TX arbiter
+	 * hardware. But AFAIK that's not possible, so we have to go for the
+	 * next best thing and write it into the beacon fifo during the open
+	 * beacon update window.
+	 */
+
+	wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
+}
+
+static void wlan_send_buffered_cab(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < CARL9170_INTF_NUM; i++) {
+		if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
+			/*
+			 * This is hardcoded into carl9170usb driver.
+			 *
+			 * The driver must set the PRETBTT event to beacon_interval -
+			 * CARL9170_PRETBTT_KUS (usually 6) Kus.
+			 *
+			 * But still, we can only do so much about 802.11-2007 9.3.2.1 &
+			 * 11.2.1.6. Let's hope the current solution is adequate enough.
+			 */
+
+			if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
+				wlan_cab_flush_queue(i);
+
+				/*
+				 * This prevents the code from sending new BC/MC frames
+				 * which were queued after the previous buffered traffic
+				 * has been sent out... They will have to wait until the
+				 * next DTIM beacon comes along.
+				 */
+				fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
+			}
+		}
+
+	}
+}
+#endif /* CONFIG_CARL9170FW_CAB_QUEUE */
+
+static void handle_beacon_config(void)
+{
+	uint32_t bcn_count;
+
+	bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
+	send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
+			 (uint8_t *) &bcn_count);
+}
+
+static void handle_pretbtt(void)
+{
+#ifdef CONFIG_CARL9170FW_CAB_QUEUE
+	fw.wlan.cab_flush_time = get_clock_counter();
+#endif /* CONFIG_CARL9170FW_CAB_QUEUE */
+
+#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
+	rf_psm();
+
+	send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
+			 (uint8_t *) &fw.phy.psm.state);
+#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
+}
+
+static void handle_atim(void)
+{
+	send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
+}
+
+#ifdef CONFIG_CARL9170FW_DEBUG
+static void handle_qos(void)
+{
+	/*
+	 * What is the QoS Bit used for?
+	 * Is it only an indicator for TXOP & Burst, or
+	 * should we do something here?
+	 */
+}
+
+static void handle_radar(void)
+{
+	send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
+}
+#endif /* CONFIG_CARL9170FW_DEBUG */
+
+static void wlan_janitor(void)
+{
+#ifdef CONFIG_CARL9170FW_CAB_QUEUE
+	wlan_send_buffered_cab();
+#endif /* CONFIG_CARL9170FW_CAB_QUEUE */
+
+	wlan_send_buffered_tx_status();
+
+	wlan_send_buffered_ba();
+
+	wol_janitor();
+}
+
+void handle_wlan(void)
+{
+	uint32_t intr;
+
+	intr = get(AR9170_MAC_REG_INT_CTRL);
+	/* ACK Interrupt */
+	set(AR9170_MAC_REG_INT_CTRL, intr);
+
+#define HANDLER(intr, flag, func)			\
+	do {						\
+		if ((intr & flag) != 0) {		\
+			func();				\
+		}					\
+	} while (0)
+
+	intr |= fw.wlan.soft_int;
+	fw.wlan.soft_int = 0;
+
+	HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
+
+	HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
+
+	HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
+
+	HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
+		handle_tx_completion);
+
+#ifdef CONFIG_CARL9170FW_DEBUG
+	HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
+
+	HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
+#endif /* CONFIG_CARL9170FW_DEBUG */
+
+	HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
+
+	if (unlikely(intr))
+		DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
+
+	wlan_janitor();
+
+#undef HANDLER
+}
+
+enum {
+	CARL9170FW_TX_MAC_BUMP = 4,
+	CARL9170FW_TX_MAC_DEBUG = 6,
+	CARL9170FW_TX_MAC_RESET = 7,
+};
+
+static void wlan_check_hang(void)
+{
+	struct dma_desc *desc;
+	int i;
+
+	for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
+		if (queue_empty(&fw.wlan.tx_queue[i])) {
+			/* Nothing to do here... move along */
+			continue;
+		}
+
+		/* fetch the current DMA queue position */
+		desc = (struct dma_desc *)get_wlan_txq_addr(i);
+
+		/* Stuck frame detection */
+		if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) {
+			fw.wlan.last_super_num[i]++;
+
+			if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) {
+				/*
+				 * schedule MAC reset (aka OFF/ON => dead)
+				 *
+				 * This will almost certainly kill
+				 * the device for good, but it's the
+				 * recommended thing to do...
+				 */
+
+				fw.wlan.mac_reset++;
+			}
+
+#ifdef CONFIG_CARL9170FW_DEBUG
+			if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) {
+				/*
+				 * Sigh, the queue is almost certainly
+				 * dead. Dump the queue content to the
+				 * user, maybe we find out why it got
+				 * so stuck.
+				 */
+
+				wlan_dump_queue(i);
+			}
+#endif /* CONFIG_CARL9170FW_DEBUG */
+
+#ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
+			if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) {
+				/*
+				 * Hrrm, bump the queue a bit.
+				 * maybe this will get it going again.
+				 */
+
+				wlan_dma_bump(i);
+				wlan_trigger(BIT(i));
+			}
+#endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
+		} else {
+			/* Nothing stuck */
+			fw.wlan.last_super[i] = DESC_PAYLOAD(desc);
+			fw.wlan.last_super_num[i] = 0;
+		}
+	}
+}
+
+#ifdef CONFIG_CARL9170FW_FW_MAC_RESET
+/*
+ * NB: Resetting the MAC is a two-edged sword.
+ * On most occasions, it does what it is supposed to do.
+ * But there is a chance that this will make it
+ * even worse and the radio dies silently.
+ */
+static void wlan_mac_reset(void)
+{
+	uint32_t val;
+	uint32_t agg_wait_counter;
+	uint32_t agg_density;
+	uint32_t bcn_start_addr;
+	uint32_t rctl, rcth;
+	uint32_t cam_mode;
+	uint32_t ack_power;
+	uint32_t rts_cts_tpc;
+	uint32_t rts_cts_rate;
+	int i;
+
+#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
+	uint32_t rx_BB;
+#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
+
+#ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET
+	INFO("MAC RESET");
+#endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */
+
+	/* Save aggregation parameters */
+	agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
+	agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
+
+	bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
+
+	cam_mode = get(AR9170_MAC_REG_CAM_MODE);
+	rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
+	rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
+
+	ack_power = get(AR9170_MAC_REG_ACK_TPC);
+	rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
+	rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
+
+#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
+	/* 0x1c8960 write only */
+	rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
+#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
+
+	/* TX/RX must be stopped by now */
+	val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
+
+	val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
+
+	/*
+	 * Manipulate CCA threshold to stop transmission
+	 *
+	 * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
+	 */
+
+	/*
+	 * check Rx state in 0(idle) 9(disable)
+	 *
+	 * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
+	 * while( (chState != 0) && (chState != 9)) {
+	 *	chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
+	 * }
+	 */
+
+	set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
+
+	delay(2);
+
+	/* Restore aggregation parameters */
+	set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
+	set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
+
+	set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
+	set(AR9170_MAC_REG_CAM_MODE, cam_mode);
+	set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
+	set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
+
+	set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
+	set(AR9170_MAC_REG_ACK_TPC, ack_power);
+	set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
+
+#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
+	set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
+#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
+
+	/*
+	 * Manipulate CCA threshold to resume transmission
+	 *
+	 * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
+	 */
+
+	val = AR9170_DMA_TRIGGER_RXQ;
+	/* Reinitialize all WLAN TX DMA queues. */
+	for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
+		struct dma_desc *iter;
+
+		__for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
+
+		/* kill the stuck frame */
+		if (!is_terminator(&fw.wlan.tx_queue[i], iter) &&
+		    fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET &&
+		    fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) {
+			struct carl9170_tx_superframe *super = get_super(iter);
+
+			iter->status = AR9170_OWN_BITS_SW;
+			/*
+			 * Mark the frame as failed.
+			 * The BAFAIL flag allows the frame to sail through
+			 * wlan_tx_status without much "unstuck" trouble.
+			 */
+			iter->ctrl &= ~(AR9170_CTRL_FAIL);
+			iter->ctrl |= AR9170_CTRL_BAFAIL;
+
+			super->s.cnt = CARL9170_TX_MAX_RATE_TRIES;
+			super->s.rix = CARL9170_TX_MAX_RETRY_RATES;
+
+			fw.wlan.last_super_num[i] = 0;
+			fw.wlan.last_super[i] = NULL;
+			iter = iter->lastAddr->nextAddr;
+		}
+
+		set_wlan_txq_dma_addr(i, (uint32_t) iter);
+		if (!is_terminator(&fw.wlan.tx_queue[i], iter))
+			val |= BIT(i);
+
+		DBG("Q:%d l:%d h:%p t:%p cu:%p it:%p ct:%x st:%x\n", i, queue_len(&fw.wlan.tx_queue[i]),
+		     fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
+		     get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
+	}
+
+	fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
+			    AR9170_MAC_INT_RETRY_FAIL;
+
+	set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
+	wlan_trigger(val);
+}
+#else
+static void wlan_mac_reset(void)
+{
+	/* The driver takes care of reinitializing the device */
+	BUG("MAC RESET");
+}
+#endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
+
+void __cold wlan_timer(void)
+{
+	unsigned int cached_mac_reset;
+
+	cached_mac_reset = fw.wlan.mac_reset;
+
+	/* TX Queue Hang check */
+	wlan_check_hang();
+
+	/* RX Overrun check */
+	wlan_check_rx_overrun();
+
+	if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
+		wlan_mac_reset();
+		fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
+	} else {
+		if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
+			fw.wlan.mac_reset--;
+	}
+}