text: /*
   * Common code for mac80211 Prism54 drivers
   *
   * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
   * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   *
   * Based on:
   * - the islsm (softmac prism54) driver, which is:
   *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
   * - stlc45xx driver
   *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/export.h>
  #include <linux/firmware.h>
  #include <linux/etherdevice.h>
  #include <asm/div64.h>
  
  #include <net/mac80211.h>
  
  #include "p54.h"
  #include "lmac.h"
  
  #ifdef P54_MM_DEBUG
  static void p54_dump_tx_queue(struct p54_common *priv)
  {
  	unsigned long flags;
  	struct ieee80211_tx_info *info;
  	struct p54_tx_info *range;
  	struct sk_buff *skb;
  	struct p54_hdr *hdr;
  	unsigned int i = 0;
  	u32 prev_addr;
  	u32 largest_hole = 0, free;
  
  	spin_lock_irqsave(&priv->tx_queue.lock, flags);
  	wiphy_debug(priv->hw->wiphy, "/ --- tx queue dump (%d entries) ---\n",
  		    skb_queue_len(&priv->tx_queue));
  
  	prev_addr = priv->rx_start;
  	skb_queue_walk(&priv->tx_queue, skb) {
  		info = IEEE80211_SKB_CB(skb);
  		range = (void *) info->rate_driver_data;
  		hdr = (void *) skb->data;
  
  		free = range->start_addr - prev_addr;
  		wiphy_debug(priv->hw->wiphy,
  			    "| [%02d] => [skb:%p skb_len:0x%04x "
  			    "hdr:{flags:%02x len:%04x req_id:%04x type:%02x} "
  			    "mem:{start:%04x end:%04x, free:%d}]\n",
  			    i++, skb, skb->len,
  			    le16_to_cpu(hdr->flags), le16_to_cpu(hdr->len),
  			    le32_to_cpu(hdr->req_id), le16_to_cpu(hdr->type),
  			    range->start_addr, range->end_addr, free);
  
  		prev_addr = range->end_addr;
  		largest_hole = max(largest_hole, free);
  	}
  	free = priv->rx_end - prev_addr;
  	largest_hole = max(largest_hole, free);
  	wiphy_debug(priv->hw->wiphy,
  		    "\\ --- [free: %d], largest free block: %d ---\n",
  		    free, largest_hole);
  	spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
  }
  #endif /* P54_MM_DEBUG */
  
  /*
   * So, the firmware is somewhat stupid and doesn't know what places in its
   * memory incoming data should go to. By poking around in the firmware, we
   * can find some unused memory to upload our packets to. However, data that we
   * want the card to TX needs to stay intact until the card has told us that
   * it is done with it. This function finds empty places we can upload to and
   * marks allocated areas as reserved if necessary. p54_find_and_unlink_skb or
   * p54_free_skb frees allocated areas.
   */
  static int p54_assign_address(struct p54_common *priv, struct sk_buff *skb)
  {
  	struct sk_buff *entry, *target_skb = NULL;
  	struct ieee80211_tx_info *info;
  	struct p54_tx_info *range;
  	struct p54_hdr *data = (void *) skb->data;
  	unsigned long flags;
  	u32 last_addr = priv->rx_start;
  	u32 target_addr = priv->rx_start;
  	u16 len = priv->headroom + skb->len + priv->tailroom + 3;
  
  	info = IEEE80211_SKB_CB(skb);
  	range = (void *) info->rate_driver_data;
  	len = (range->extra_len + len) & ~0x3;
  
  	spin_lock_irqsave(&priv->tx_queue.lock, flags);
  	if (unlikely(skb_queue_len(&priv->tx_queue) == 32)) {
  		/*
  		 * The tx_queue is now really full.
  		 *
  		 * TODO: check if the device has crashed and reset it.
  		 */
  		spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
  		return -EBUSY;
  	}
  
  	skb_queue_walk(&priv->tx_queue, entry) {
  		u32 hole_size;
  		info = IEEE80211_SKB_CB(entry);
  		range = (void *) info->rate_driver_data;
  		hole_size = range->start_addr - last_addr;
  
  		if (!target_skb && hole_size >= len) {
  			target_skb = entry->prev;
  			hole_size -= len;
  			target_addr = last_addr;
  			break;
  		}
  		last_addr = range->end_addr;
  	}
  	if (unlikely(!target_skb)) {
  		if (priv->rx_end - last_addr >= len) {
  			target_skb = priv->tx_queue.prev;
  			if (!skb_queue_empty(&priv->tx_queue)) {
  				info = IEEE80211_SKB_CB(target_skb);
  				range = (void *)info->rate_driver_data;
  				target_addr = range->end_addr;
  			}
  		} else {
  			spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
  			return -ENOSPC;
  		}
  	}
  
  	info = IEEE80211_SKB_CB(skb);
  	range = (void *) info->rate_driver_data;
  	range->start_addr = target_addr;
  	range->end_addr = target_addr + len;
  	data->req_id = cpu_to_le32(target_addr + priv->headroom);
  	if (IS_DATA_FRAME(skb) &&
  	    unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON))
  		priv->beacon_req_id = data->req_id;
  
  	__skb_queue_after(&priv->tx_queue, target_skb, skb);
  	spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
  	return 0;
  }
  
  static void p54_tx_pending(struct p54_common *priv)
  {
  	struct sk_buff *skb;
  	int ret;
  
  	skb = skb_dequeue(&priv->tx_pending);
  	if (unlikely(!skb))
  		return ;
  
  	ret = p54_assign_address(priv, skb);
  	if (unlikely(ret))
  		skb_queue_head(&priv->tx_pending, skb);
  	else
  		priv->tx(priv->hw, skb);
  }
  
  static void p54_wake_queues(struct p54_common *priv)
  {
  	unsigned long flags;
  	unsigned int i;
  
  	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
  		return ;
  
  	p54_tx_pending(priv);
  
  	spin_lock_irqsave(&priv->tx_stats_lock, flags);
  	for (i = 0; i < priv->hw->queues; i++) {
  		if (priv->tx_stats[i + P54_QUEUE_DATA].len <
  		    priv->tx_stats[i + P54_QUEUE_DATA].limit)
  			ieee80211_wake_queue(priv->hw, i);
  	}
  	spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
  }
  
  static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
  				       struct sk_buff *skb,
  				       const u16 p54_queue)
  {
  	struct p54_tx_queue_stats *queue;
  	unsigned long flags;
  
  	if (WARN_ON(p54_queue >= P54_QUEUE_NUM))
  		return -EINVAL;
  
  	queue = &priv->tx_stats[p54_queue];
  
  	spin_lock_irqsave(&priv->tx_stats_lock, flags);
  	if (unlikely(queue->len >= queue->limit && IS_QOS_QUEUE(p54_queue))) {
  		spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
  		return -ENOSPC;
  	}
  
  	queue->len++;
  	queue->count++;
  
  	if (unlikely(queue->len == queue->limit && IS_QOS_QUEUE(p54_queue))) {
  		u16 ac_queue = p54_queue - P54_QUEUE_DATA;
  		ieee80211_stop_queue(priv->hw, ac_queue);
  	}
  
  	spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
  	return 0;
  }
  
  static void p54_tx_qos_accounting_free(struct p54_common *priv,
  				       struct sk_buff *skb)
  {
  	if (IS_DATA_FRAME(skb)) {
  		unsigned long flags;
  
  		spin_lock_irqsave(&priv->tx_stats_lock, flags);
  		priv->tx_stats[GET_HW_QUEUE(skb)].len--;
  		spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
  
  		if (unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON)) {
  			if (priv->beacon_req_id == GET_REQ_ID(skb)) {
  				/* this is the  active beacon set anymore */
  				priv->beacon_req_id = 0;
  			}
  			complete(&priv->beacon_comp);
  		}
  	}
  	p54_wake_queues(priv);
  }
  
  void p54_free_skb(struct ieee80211_hw *dev, struct sk_buff *skb)
  {
  	struct p54_common *priv = dev->priv;
  	if (unlikely(!skb))
  		return ;
  
  	skb_unlink(skb, &priv->tx_queue);
  	p54_tx_qos_accounting_free(priv, skb);
  	ieee80211_free_txskb(dev, skb);
  }
  EXPORT_SYMBOL_GPL(p54_free_skb);
  
  static struct sk_buff *p54_find_and_unlink_skb(struct p54_common *priv,
  					       const __le32 req_id)
  {
  	struct sk_buff *entry;
  	unsigned long flags;
  
  	spin_lock_irqsave(&priv->tx_queue.lock, flags);
  	skb_queue_walk(&priv->tx_queue, entry) {
  		struct p54_hdr *hdr = (struct p54_hdr *) entry->data;
  
  		if (hdr->req_id == req_id) {
  			__skb_unlink(entry, &priv->tx_queue);
  			spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
  			p54_tx_qos_accounting_free(priv, entry);
  			return entry;
  		}
  	}
  	spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
  	return NULL;
  }
  
  void p54_tx(struct p54_common *priv, struct sk_buff *skb)
  {
  	skb_queue_tail(&priv->tx_pending, skb);
  	p54_tx_pending(priv);
  }
  
  static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
  {
  	if (priv->rxhw != 5) {
  		return ((rssi * priv->cur_rssi->mul) / 64 +
  			 priv->cur_rssi->add) / 4;
  	} else {
  		/*
  		 * TODO: find the correct formula
  		 */
  		return rssi / 2 - 110;
  	}
  }
  
  /*
   * Even if the firmware is capable of dealing with incoming traffic,
   * while dozing, we have to prepared in case mac80211 uses PS-POLL
   * to retrieve outstanding frames from our AP.
   * (see comment in net/mac80211/mlme.c @ line 1993)
   */
  static void p54_pspoll_workaround(struct p54_common *priv, struct sk_buff *skb)
  {
  	struct ieee80211_hdr *hdr = (void *) skb->data;
  	struct ieee80211_tim_ie *tim_ie;
  	u8 *tim;
  	u8 tim_len;
  	bool new_psm;
  
  	/* only beacons have a TIM IE */
  	if (!ieee80211_is_beacon(hdr->frame_control))
  		return;
  
  	if (!priv->aid)
  		return;
  
  	/* only consider beacons from the associated BSSID */
  	if (!ether_addr_equal_64bits(hdr->addr3, priv->bssid))
  		return;
  
  	tim = p54_find_ie(skb, WLAN_EID_TIM);
  	if (!tim)
  		return;
  
  	tim_len = tim[1];
  	tim_ie = (struct ieee80211_tim_ie *) &tim[2];
  
  	new_psm = ieee80211_check_tim(tim_ie, tim_len, priv->aid);
  	if (new_psm != priv->powersave_override) {
  		priv->powersave_override = new_psm;
  		p54_set_ps(priv);
  	}
  }
  
  static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
  {
  	struct p54_rx_data *hdr = (struct p54_rx_data *) skb->data;
  	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
  	u16 freq = le16_to_cpu(hdr->freq);
  	size_t header_len = sizeof(*hdr);
  	u32 tsf32;
  	u8 rate = hdr->rate & 0xf;
  
  	/*
  	 * If the device is in a unspecified state we have to
  	 * ignore all data frames. Else we could end up with a
  	 * nasty crash.
  	 */
  	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
  		return 0;
  
  	if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD)))
  		return 0;
  
  	if (hdr->decrypt_status == P54_DECRYPT_OK)
  		rx_status->flag |= RX_FLAG_DECRYPTED;
  	if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) ||
  	    (hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP))
  		rx_status->flag |= RX_FLAG_MMIC_ERROR;
  
  	rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi);
  	if (hdr->rate & 0x10)
  		rx_status->flag |= RX_FLAG_SHORTPRE;
  	if (priv->hw->conf.chandef.chan->band == IEEE80211_BAND_5GHZ)
  		rx_status->rate_idx = (rate < 4) ? 0 : rate - 4;
  	else
  		rx_status->rate_idx = rate;
  
  	rx_status->freq = freq;
  	rx_status->band =  priv->hw->conf.chandef.chan->band;
  	rx_status->antenna = hdr->antenna;
  
  	tsf32 = le32_to_cpu(hdr->tsf32);
  	if (tsf32 < priv->tsf_low32)
  		priv->tsf_high32++;
  	rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32;
  	priv->tsf_low32 = tsf32;
  
  	/* LMAC API Page 10/29 - s_lm_data_in - clock
  	 * "usec accurate timestamp of hardware clock
  	 * at end of frame (before OFDM SIFS EOF padding"
  	 */
  	rx_status->flag |= RX_FLAG_MACTIME_END;
  
  	if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
  		header_len += hdr->align[0];
  
  	skb_pull(skb, header_len);
  	skb_trim(skb, le16_to_cpu(hdr->len));
  	if (unlikely(priv->hw->conf.flags & IEEE80211_CONF_PS))
  		p54_pspoll_workaround(priv, skb);
  
  	ieee80211_rx_irqsafe(priv->hw, skb);
  
  	ieee80211_queue_delayed_work(priv->hw, &priv->work,
  			   msecs_to_jiffies(P54_STATISTICS_UPDATE));
  
  	return -1;
  }
  
  static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb)
  {
  	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
  	struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data;
  	struct ieee80211_tx_info *info;
  	struct p54_hdr *entry_hdr;
  	struct p54_tx_data *entry_data;
  	struct sk_buff *entry;
  	unsigned int pad = 0, frame_len;
  	int count, idx;
  
  	entry = p54_find_and_unlink_skb(priv, hdr->req_id);
  	if (unlikely(!entry))
  		return ;
  
  	frame_len = entry->len;
  	info = IEEE80211_SKB_CB(entry);
  	entry_hdr = (struct p54_hdr *) entry->data;
  	entry_data = (struct p54_tx_data *) entry_hdr->data;
  	priv->stats.dot11ACKFailureCount += payload->tries - 1;
  
  	/*
  	 * Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are
  	 * generated by the driver. Therefore tx_status is bogus
  	 * and we don't want to confuse the mac80211 stack.
  	 */
  	if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) {
  		dev_kfree_skb_any(entry);
  		return ;
  	}
  
  	/*
  	 * Clear manually, ieee80211_tx_info_clear_status would
  	 * clear the counts too and we need them.
  	 */
  	memset(&info->status.ack_signal, 0,
  	       sizeof(struct ieee80211_tx_info) -
  	       offsetof(struct ieee80211_tx_info, status.ack_signal));
  	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info,
  			      status.ack_signal) != 20);
  
  	if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
  		pad = entry_data->align[0];
  
  	/* walk through the rates array and adjust the counts */
  	count = payload->tries;
  	for (idx = 0; idx < 4; idx++) {
  		if (count >= info->status.rates[idx].count) {
  			count -= info->status.rates[idx].count;
  		} else if (count > 0) {
  			info->status.rates[idx].count = count;
  			count = 0;
  		} else {
  			info->status.rates[idx].idx = -1;
  			info->status.rates[idx].count = 0;
  		}
  	}
  
  	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
  	     !(payload->status & P54_TX_FAILED))
  		info->flags |= IEEE80211_TX_STAT_ACK;
  	if (payload->status & P54_TX_PSM_CANCELLED)
  		info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
  	info->status.ack_signal = p54_rssi_to_dbm(priv,
  						  (int)payload->ack_rssi);
  
  	/* Undo all changes to the frame. */
  	switch (entry_data->key_type) {
  	case P54_CRYPTO_TKIPMICHAEL: {
  		u8 *iv = (u8 *)(entry_data->align + pad +
  				entry_data->crypt_offset);
  
  		/* Restore the original TKIP IV. */
  		iv[2] = iv[0];
  		iv[0] = iv[1];
  		iv[1] = (iv[0] | 0x20) & 0x7f;	/* WEPSeed - 8.3.2.2 */
  
  		frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
  		break;
  		}
  	case P54_CRYPTO_AESCCMP:
  		frame_len -= 8; /* remove CCMP_MIC */
  		break;
  	case P54_CRYPTO_WEP:
  		frame_len -= 4; /* remove WEP_ICV */
  		break;
  	}
  
  	skb_trim(entry, frame_len);
  	skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
  	ieee80211_tx_status_irqsafe(priv->hw, entry);
  }
  
  static void p54_rx_eeprom_readback(struct p54_common *priv,
  				   struct sk_buff *skb)
  {
  	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
  	struct p54_eeprom_lm86 *eeprom = (struct p54_eeprom_lm86 *) hdr->data;
  	struct sk_buff *tmp;
  
  	if (!priv->eeprom)
  		return ;
  
  	if (priv->fw_var >= 0x509) {
  		memcpy(priv->eeprom, eeprom->v2.data,
  		       le16_to_cpu(eeprom->v2.len));
  	} else {
  		memcpy(priv->eeprom, eeprom->v1.data,
  		       le16_to_cpu(eeprom->v1.len));
  	}
  
  	priv->eeprom = NULL;
  	tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
  	dev_kfree_skb_any(tmp);
  	complete(&priv->eeprom_comp);
  }
  
  static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
  {
  	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
  	struct p54_statistics *stats = (struct p54_statistics *) hdr->data;
  	struct sk_buff *tmp;
  	struct ieee80211_channel *chan;
  	unsigned int i, rssi, tx, cca, dtime, dtotal, dcca, dtx, drssi, unit;
  	u32 tsf32;
  
  	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
  		return ;
  
  	tsf32 = le32_to_cpu(stats->tsf32);
  	if (tsf32 < priv->tsf_low32)
  		priv->tsf_high32++;
  	priv->tsf_low32 = tsf32;
  
  	priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
  	priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
  	priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);
  
  	priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
  
  	/*
  	 * STSW450X LMAC API page 26 - 3.8 Statistics
  	 * "The exact measurement period can be derived from the
  	 * timestamp member".
  	 */
  	dtime = tsf32 - priv->survey_raw.timestamp;
  
  	/*
  	 * STSW450X LMAC API page 26 - 3.8.1 Noise histogram
  	 * The LMAC samples RSSI, CCA and transmit state at regular
  	 * periods (typically 8 times per 1k [as in 1024] usec).
  	 */
  	cca = le32_to_cpu(stats->sample_cca);
  	tx = le32_to_cpu(stats->sample_tx);
  	rssi = 0;
  	for (i = 0; i < ARRAY_SIZE(stats->sample_noise); i++)
  		rssi += le32_to_cpu(stats->sample_noise[i]);
  
  	dcca = cca - priv->survey_raw.cached_cca;
  	drssi = rssi - priv->survey_raw.cached_rssi;
  	dtx = tx - priv->survey_raw.cached_tx;
  	dtotal = dcca + drssi + dtx;
  
  	/*
  	 * update statistics when more than a second is over since the
  	 * last call, or when a update is badly needed.
  	 */
  	if (dtotal && (priv->update_stats || dtime >= USEC_PER_SEC) &&
  	    dtime >= dtotal) {
  		priv->survey_raw.timestamp = tsf32;
  		priv->update_stats = false;
  		unit = dtime / dtotal;
  
  		if (dcca) {
  			priv->survey_raw.cca += dcca * unit;
  			priv->survey_raw.cached_cca = cca;
  		}
  		if (dtx) {
  			priv->survey_raw.tx += dtx * unit;
  			priv->survey_raw.cached_tx = tx;
  		}
  		if (drssi) {
  			priv->survey_raw.rssi += drssi * unit;
  			priv->survey_raw.cached_rssi = rssi;
  		}
  
  		/* 1024 usec / 8 times = 128 usec / time */
  		if (!(priv->phy_ps || priv->phy_idle))
  			priv->survey_raw.active += dtotal * unit;
  		else
  			priv->survey_raw.active += (dcca + dtx) * unit;
  	}
  
  	chan = priv->curchan;
  	if (chan) {
  		struct survey_info *survey = &priv->survey[chan->hw_value];
  		survey->noise = clamp(priv->noise, -128, 127);
  		survey->channel_time = priv->survey_raw.active;
  		survey->channel_time_tx = priv->survey_raw.tx;
  		survey->channel_time_busy = priv->survey_raw.tx +
  			priv->survey_raw.cca;
  		do_div(survey->channel_time, 1024);
  		do_div(survey->channel_time_tx, 1024);
  		do_div(survey->channel_time_busy, 1024);
  	}
  
  	tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
  	dev_kfree_skb_any(tmp);
  	complete(&priv->stat_comp);
  }
  
  static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb)
  {
  	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
  	struct p54_trap *trap = (struct p54_trap *) hdr->data;
  	u16 event = le16_to_cpu(trap->event);
  	u16 freq = le16_to_cpu(trap->frequency);
  
  	switch (event) {
  	case P54_TRAP_BEACON_TX:
  		break;
  	case P54_TRAP_RADAR:
  		wiphy_info(priv->hw->wiphy, "radar (freq:%d MHz)\n", freq);
  		break;
  	case P54_TRAP_NO_BEACON:
  		if (priv->vif)
  			ieee80211_beacon_loss(priv->vif);
  		break;
  	case P54_TRAP_SCAN:
  		break;
  	case P54_TRAP_TBTT:
  		break;
  	case P54_TRAP_TIMER:
  		break;
  	case P54_TRAP_FAA_RADIO_OFF:
  		wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
  		break;
  	case P54_TRAP_FAA_RADIO_ON:
  		wiphy_rfkill_set_hw_state(priv->hw->wiphy, false);
  		break;
  	default:
  		wiphy_info(priv->hw->wiphy, "received event:%x freq:%d\n",
  			   event, freq);
  		break;
  	}
  }
  
  static int p54_rx_control(struct p54_common *priv, struct sk_buff *skb)
  {
  	struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
  
  	switch (le16_to_cpu(hdr->type)) {
  	case P54_CONTROL_TYPE_TXDONE:
  		p54_rx_frame_sent(priv, skb);
  		break;
  	case P54_CONTROL_TYPE_TRAP:
  		p54_rx_trap(priv, skb);
  		break;
  	case P54_CONTROL_TYPE_BBP:
  		break;
  	case P54_CONTROL_TYPE_STAT_READBACK:
  		p54_rx_stats(priv, skb);
  		break;
  	case P54_CONTROL_TYPE_EEPROM_READBACK:
  		p54_rx_eeprom_readback(priv, skb);
  		break;
  	default:
  		wiphy_debug(priv->hw->wiphy,
  			    "not handling 0x%02x type control frame\n",
  			    le16_to_cpu(hdr->type));
  		break;
  	}
  	return 0;
  }
  
  /* returns zero if skb can be reused */
  int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
  {
  	struct p54_common *priv = dev->priv;
  	u16 type = le16_to_cpu(*((__le16 *)skb->data));
  
  	if (type & P54_HDR_FLAG_CONTROL)
  		return p54_rx_control(priv, skb);
  	else
  		return p54_rx_data(priv, skb);
  }
  EXPORT_SYMBOL_GPL(p54_rx);
  
  static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb,
  				struct ieee80211_tx_info *info,
  				struct ieee80211_sta *sta,
  				u8 *queue, u32 *extra_len, u16 *flags, u16 *aid,
  				bool *burst_possible)
  {
  	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  
  	if (ieee80211_is_data_qos(hdr->frame_control))
  		*burst_possible = true;
  	else
  		*burst_possible = false;
  
  	if (!(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
  		*flags |= P54_HDR_FLAG_DATA_OUT_SEQNR;
  
  	if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)
  		*flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
  
  	if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
  		*flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
  
  	*queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;
  
  	switch (priv->mode) {
  	case NL80211_IFTYPE_MONITOR:
  		/*
  		 * We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for
  		 * every frame in promiscuous/monitor mode.
  		 * see STSW45x0C LMAC API - page 12.
  		 */
  		*aid = 0;
  		*flags |= P54_HDR_FLAG_DATA_OUT_PROMISC;
  		break;
  	case NL80211_IFTYPE_STATION:
  		*aid = 1;
  		break;
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_ADHOC:
  	case NL80211_IFTYPE_MESH_POINT:
  		if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
  			*aid = 0;
  			*queue = P54_QUEUE_CAB;
  			return;
  		}
  
  		if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
  			if (ieee80211_is_probe_resp(hdr->frame_control)) {
  				*aid = 0;
  				*flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP |
  					  P54_HDR_FLAG_DATA_OUT_NOCANCEL;
  				return;
  			} else if (ieee80211_is_beacon(hdr->frame_control)) {
  				*aid = 0;
  
  				if (info->flags & IEEE80211_TX_CTL_INJECTED) {
  					/*
  					 * Injecting beacons on top of a AP is
  					 * not a good idea... nevertheless,
  					 * it should be doable.
  					 */
  
  					return;
  				}
  
  				*flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP;
  				*queue = P54_QUEUE_BEACON;
  				*extra_len = IEEE80211_MAX_TIM_LEN;
  				return;
  			}
  		}
  
  		if (sta)
  			*aid = sta->aid;
  		break;
  	}
  }
  
  static u8 p54_convert_algo(u32 cipher)
  {
  	switch (cipher) {
  	case WLAN_CIPHER_SUITE_WEP40:
  	case WLAN_CIPHER_SUITE_WEP104:
  		return P54_CRYPTO_WEP;
  	case WLAN_CIPHER_SUITE_TKIP:
  		return P54_CRYPTO_TKIPMICHAEL;
  	case WLAN_CIPHER_SUITE_CCMP:
  		return P54_CRYPTO_AESCCMP;
  	default:
  		return 0;
  	}
  }
  
  void p54_tx_80211(struct ieee80211_hw *dev,
  		  struct ieee80211_tx_control *control,
  		  struct sk_buff *skb)
  {
  	struct p54_common *priv = dev->priv;
  	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  	struct p54_tx_info *p54info;
  	struct p54_hdr *hdr;
  	struct p54_tx_data *txhdr;
  	unsigned int padding, len, extra_len = 0;
  	int i, j, ridx;
  	u16 hdr_flags = 0, aid = 0;
  	u8 rate, queue = 0, crypt_offset = 0;
  	u8 cts_rate = 0x20;
  	u8 rc_flags;
  	u8 calculated_tries[4];
  	u8 nrates = 0, nremaining = 8;
  	bool burst_allowed = false;
  
  	p54_tx_80211_header(priv, skb, info, control->sta, &queue, &extra_len,
  			    &hdr_flags, &aid, &burst_allowed);
  
  	if (p54_tx_qos_accounting_alloc(priv, skb, queue)) {
  		ieee80211_free_txskb(dev, skb);
  		return;
  	}
  
  	padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
  	len = skb->len;
  
  	if (info->control.hw_key) {
  		crypt_offset = ieee80211_get_hdrlen_from_skb(skb);
  		if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
  			u8 *iv = (u8 *)(skb->data + crypt_offset);
  			/*
  			 * The firmware excepts that the IV has to have
  			 * this special format
  			 */
  			iv[1] = iv[0];
  			iv[0] = iv[2];
  			iv[2] = 0;
  		}
  	}
  
  	txhdr = (struct p54_tx_data *) skb_push(skb, sizeof(*txhdr) + padding);
  	hdr = (struct p54_hdr *) skb_push(skb, sizeof(*hdr));
  
  	if (padding)
  		hdr_flags |= P54_HDR_FLAG_DATA_ALIGN;
  	hdr->type = cpu_to_le16(aid);
  	hdr->rts_tries = info->control.rates[0].count;
  
  	/*
  	 * we register the rates in perfect order, and
  	 * RTS/CTS won't happen on 5 GHz
  	 */
  	cts_rate = info->control.rts_cts_rate_idx;
  
  	memset(&txhdr->rateset, 0, sizeof(txhdr->rateset));
  
  	/* see how many rates got used */
  	for (i = 0; i < dev->max_rates; i++) {
  		if (info->control.rates[i].idx < 0)
  			break;
  		nrates++;
  	}
  
  	/* limit tries to 8/nrates per rate */
  	for (i = 0; i < nrates; i++) {
  		/*
  		 * The magic expression here is equivalent to 8/nrates for
  		 * all values that matter, but avoids division and jumps.
  		 * Note that nrates can only take the values 1 through 4.
  		 */
  		calculated_tries[i] = min_t(int, ((15 >> nrates) | 1) + 1,
  						 info->control.rates[i].count);
  		nremaining -= calculated_tries[i];
  	}
  
  	/* if there are tries left, distribute from back to front */
  	for (i = nrates - 1; nremaining > 0 && i >= 0; i--) {
  		int tmp = info->control.rates[i].count - calculated_tries[i];
  
  		if (tmp <= 0)
  			continue;
  		/* RC requested more tries at this rate */
  
  		tmp = min_t(int, tmp, nremaining);
  		calculated_tries[i] += tmp;
  		nremaining -= tmp;
  	}
  
  	ridx = 0;
  	for (i = 0; i < nrates && ridx < 8; i++) {
  		/* we register the rates in perfect order */
  		rate = info->control.rates[i].idx;
  		if (info->band == IEEE80211_BAND_5GHZ)
  			rate += 4;
  
  		/* store the count we actually calculated for TX status */
  		info->control.rates[i].count = calculated_tries[i];
  
  		rc_flags = info->control.rates[i].flags;
  		if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) {
  			rate |= 0x10;
  			cts_rate |= 0x10;
  		}
  		if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
  			burst_allowed = false;
  			rate |= 0x40;
  		} else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
  			rate |= 0x20;
  			burst_allowed = false;
  		}
  		for (j = 0; j < calculated_tries[i] && ridx < 8; j++) {
  			txhdr->rateset[ridx] = rate;
  			ridx++;
  		}
  	}
  
  	if (burst_allowed)
  		hdr_flags |= P54_HDR_FLAG_DATA_OUT_BURST;
  
  	/* TODO: enable bursting */
  	hdr->flags = cpu_to_le16(hdr_flags);
  	hdr->tries = ridx;
  	txhdr->rts_rate_idx = 0;
  	if (info->control.hw_key) {
  		txhdr->key_type = p54_convert_algo(info->control.hw_key->cipher);
  		txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
  		memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
  		if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
  			/* reserve space for the MIC key */
  			len += 8;
  			memcpy(skb_put(skb, 8), &(info->control.hw_key->key
  				[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]), 8);
  		}
  		/* reserve some space for ICV */
  		len += info->control.hw_key->icv_len;
  		memset(skb_put(skb, info->control.hw_key->icv_len), 0,
  		       info->control.hw_key->icv_len);
  	} else {
  		txhdr->key_type = 0;
  		txhdr->key_len = 0;
  	}
  	txhdr->crypt_offset = crypt_offset;
  	txhdr->hw_queue = queue;
  	txhdr->backlog = priv->tx_stats[queue].len - 1;
  	memset(txhdr->durations, 0, sizeof(txhdr->durations));
  	txhdr->tx_antenna = 2 & priv->tx_diversity_mask;
  	if (priv->rxhw == 5) {
  		txhdr->longbow.cts_rate = cts_rate;
  		txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
  	} else {
  		txhdr->normal.output_power = priv->output_power;
  		txhdr->normal.cts_rate = cts_rate;
  	}
  	if (padding)
  		txhdr->align[0] = padding;
  
  	hdr->len = cpu_to_le16(len);
  	/* modifies skb->cb and with it info, so must be last! */
  	p54info = (void *) info->rate_driver_data;
  	p54info->extra_len = extra_len;
  
  	p54_tx(priv, skb);
  }
  