drivers/net/wireless/ath/ar9170/mac.c - linux - Git at Google

 /*
  * Atheros AR9170 driver
  *
  * MAC programming
  *
  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  *
  * 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; see the file COPYING.  If not, see
  * http://www.gnu.org/licenses/.
  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *    Copyright (c) 2007-2008 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 "ar9170.h"
 #include "cmd.h"

 int ar9170_set_dyn_sifs_ack(struct ar9170 *ar)
 {
 	u32 val;

 	if (conf_is_ht40(&ar->hw->conf))
 		val = 0x010a;
 	else {
 		if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ)
 			val = 0x105;
 		else
 			val = 0x104;
 	}

 	return ar9170_write_reg(ar, AR9170_MAC_REG_DYNAMIC_SIFS_ACK, val);
 }

 int ar9170_set_slot_time(struct ar9170 *ar)
 {
 	u32 slottime = 20;

 	if (!ar->vif)
 		return 0;

 	if ((ar->hw->conf.channel->band == IEEE80211_BAND_5GHZ) ||
 	    ar->vif->bss_conf.use_short_slot)
 		slottime = 9;

 	return ar9170_write_reg(ar, AR9170_MAC_REG_SLOT_TIME, slottime << 10);
 }

 int ar9170_set_basic_rates(struct ar9170 *ar)
 {
 	u8 cck, ofdm;

 	if (!ar->vif)
 		return 0;

 	ofdm = ar->vif->bss_conf.basic_rates >> 4;

 	/* FIXME: is still necessary? */
 	if (ar->hw->conf.channel->band == IEEE80211_BAND_5GHZ)
 		cck = 0;
 	else
 		cck = ar->vif->bss_conf.basic_rates & 0xf;

 	return ar9170_write_reg(ar, AR9170_MAC_REG_BASIC_RATE,
 				ofdm << 8 | cck);
 }

 int ar9170_set_qos(struct ar9170 *ar)
 {
 	ar9170_regwrite_begin(ar);

 	ar9170_regwrite(AR9170_MAC_REG_AC0_CW, ar->edcf[0].cw_min |
 			(ar->edcf[0].cw_max << 16));
 	ar9170_regwrite(AR9170_MAC_REG_AC1_CW, ar->edcf[1].cw_min |
 			(ar->edcf[1].cw_max << 16));
 	ar9170_regwrite(AR9170_MAC_REG_AC2_CW, ar->edcf[2].cw_min |
 			(ar->edcf[2].cw_max << 16));
 	ar9170_regwrite(AR9170_MAC_REG_AC3_CW, ar->edcf[3].cw_min |
 			(ar->edcf[3].cw_max << 16));
 	ar9170_regwrite(AR9170_MAC_REG_AC4_CW, ar->edcf[4].cw_min |
 			(ar->edcf[4].cw_max << 16));

 	ar9170_regwrite(AR9170_MAC_REG_AC1_AC0_AIFS,
 			((ar->edcf[0].aifs * 9 + 10)) |
 			((ar->edcf[1].aifs * 9 + 10) << 12) |
 			((ar->edcf[2].aifs * 9 + 10) << 24));
 	ar9170_regwrite(AR9170_MAC_REG_AC3_AC2_AIFS,
 			((ar->edcf[2].aifs * 9 + 10) >> 8) |
 			((ar->edcf[3].aifs * 9 + 10) << 4) |
 			((ar->edcf[4].aifs * 9 + 10) << 16));

 	ar9170_regwrite(AR9170_MAC_REG_AC1_AC0_TXOP,
 			ar->edcf[0].txop | ar->edcf[1].txop << 16);
 	ar9170_regwrite(AR9170_MAC_REG_AC3_AC2_TXOP,
 			ar->edcf[1].txop | ar->edcf[3].txop << 16);

 	ar9170_regwrite_finish();

 	return ar9170_regwrite_result();
 }

 static int ar9170_set_ampdu_density(struct ar9170 *ar, u8 mpdudensity)
 {
 	u32 val;

 	/* don't allow AMPDU density > 8us */
 	if (mpdudensity > 6)
 		return -EINVAL;

 	/* Watch out! Otus uses slightly different density values. */
 	val = 0x140a00 | (mpdudensity ? (mpdudensity + 1) : 0);

 	ar9170_regwrite_begin(ar);
 	ar9170_regwrite(AR9170_MAC_REG_AMPDU_DENSITY, val);
 	ar9170_regwrite_finish();

 	return ar9170_regwrite_result();
 }

 int ar9170_init_mac(struct ar9170 *ar)
 {
 	ar9170_regwrite_begin(ar);

 	ar9170_regwrite(AR9170_MAC_REG_ACK_EXTENSION, 0x40);

 	ar9170_regwrite(AR9170_MAC_REG_RETRY_MAX, 0);

 	/* enable MMIC */
 	ar9170_regwrite(AR9170_MAC_REG_SNIFFER,
 			AR9170_MAC_REG_SNIFFER_DEFAULTS);

 	ar9170_regwrite(AR9170_MAC_REG_RX_THRESHOLD, 0xc1f80);

 	ar9170_regwrite(AR9170_MAC_REG_RX_PE_DELAY, 0x70);
 	ar9170_regwrite(AR9170_MAC_REG_EIFS_AND_SIFS, 0xa144000);
 	ar9170_regwrite(AR9170_MAC_REG_SLOT_TIME, 9 << 10);

 	/* CF-END mode */
 	ar9170_regwrite(0x1c3b2c, 0x19000000);

 	/* NAV protects ACK only (in TXOP) */
 	ar9170_regwrite(0x1c3b38, 0x201);

 	/* Set Beacon PHY CTRL's TPC to 0x7, TA1=1 */
 	/* OTUS set AM to 0x1 */
 	ar9170_regwrite(AR9170_MAC_REG_BCN_HT1, 0x8000170);

 	ar9170_regwrite(AR9170_MAC_REG_BACKOFF_PROTECT, 0x105);

 	/* AGG test code*/
 	/* Aggregation MAX number and timeout */
 	ar9170_regwrite(0x1c3b9c, 0x10000a);

 	ar9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
 			AR9170_MAC_REG_FTF_DEFAULTS);

 	/* Enable deaggregator, response in sniffer mode */
 	ar9170_regwrite(0x1c3c40, 0x1 | 1<<30);

 	/* rate sets */
 	ar9170_regwrite(AR9170_MAC_REG_BASIC_RATE, 0x150f);
 	ar9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, 0x150f);
 	ar9170_regwrite(AR9170_MAC_REG_RTS_CTS_RATE, 0x10b01bb);

 	/* MIMO response control */
 	ar9170_regwrite(0x1c3694, 0x4003C1E);/* bit 26~28  otus-AM */

 	/* switch MAC to OTUS interface */
 	ar9170_regwrite(0x1c3600, 0x3);

 	ar9170_regwrite(AR9170_MAC_REG_AMPDU_RX_THRESH, 0xffff);

 	/* set PHY register read timeout (??) */
 	ar9170_regwrite(AR9170_MAC_REG_MISC_680, 0xf00008);

 	/* Disable Rx TimeOut, workaround for BB. */
 	ar9170_regwrite(AR9170_MAC_REG_RX_TIMEOUT, 0x0);

 	/* Set CPU clock frequency to 88/80MHz */
 	ar9170_regwrite(AR9170_PWR_REG_CLOCK_SEL,
 			AR9170_PWR_CLK_AHB_80_88MHZ |
 			AR9170_PWR_CLK_DAC_160_INV_DLY);

 	/* Set WLAN DMA interrupt mode: generate int per packet */
 	ar9170_regwrite(AR9170_MAC_REG_TXRX_MPI, 0x110011);

 	ar9170_regwrite(AR9170_MAC_REG_FCS_SELECT,
 			AR9170_MAC_FCS_FIFO_PROT);

 	/* Disables the CF_END frame, undocumented register */
 	ar9170_regwrite(AR9170_MAC_REG_TXOP_NOT_ENOUGH_IND,
 			0x141E0F48);

 	ar9170_regwrite_finish();

 	return ar9170_regwrite_result();
 }

 static int ar9170_set_mac_reg(struct ar9170 *ar, const u32 reg, const u8 *mac)
 {
 	static const u8 zero[ETH_ALEN] = { 0 };

 	if (!mac)
 		mac = zero;

 	ar9170_regwrite_begin(ar);

 	ar9170_regwrite(reg,
 			(mac[3] << 24) | (mac[2] << 16) |
 			(mac[1] << 8) | mac[0]);

 	ar9170_regwrite(reg + 4, (mac[5] << 8) | mac[4]);

 	ar9170_regwrite_finish();

 	return ar9170_regwrite_result();
 }

 int ar9170_update_multicast(struct ar9170 *ar, const u64 mc_hash)
 {
 	int err;

 	ar9170_regwrite_begin(ar);
 	ar9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, mc_hash >> 32);
 	ar9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, mc_hash);
 	ar9170_regwrite_finish();
 	err = ar9170_regwrite_result();
 	if (err)
 		return err;

 	ar->cur_mc_hash = mc_hash;
 	return 0;
 }

 int ar9170_update_frame_filter(struct ar9170 *ar, const u32 filter)
 {
 	int err;

 	err = ar9170_write_reg(ar, AR9170_MAC_REG_FRAMETYPE_FILTER, filter);
 	if (err)
 		return err;

 	ar->cur_filter = filter;
 	return 0;
 }

 static int ar9170_set_promiscouous(struct ar9170 *ar)
 {
 	u32 encr_mode, sniffer;
 	int err;

 	err = ar9170_read_reg(ar, AR9170_MAC_REG_SNIFFER, &sniffer);
 	if (err)
 		return err;

 	err = ar9170_read_reg(ar, AR9170_MAC_REG_ENCRYPTION, &encr_mode);
 	if (err)
 		return err;

 	if (ar->sniffer_enabled) {
 		sniffer |= AR9170_MAC_REG_SNIFFER_ENABLE_PROMISC;

 		/*
 		 * Rx decryption works in place.
 		 *
 		 * If we don't disable it, the hardware will render all
 		 * encrypted frames which are encrypted with an unknown
 		 * key useless.
 		 */

 		encr_mode |= AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 		ar->sniffer_enabled = true;
 	} else {
 		sniffer &= ~AR9170_MAC_REG_SNIFFER_ENABLE_PROMISC;

 		if (ar->rx_software_decryption)
 			encr_mode |= AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 		else
 			encr_mode &= ~AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 	}

 	ar9170_regwrite_begin(ar);
 	ar9170_regwrite(AR9170_MAC_REG_ENCRYPTION, encr_mode);
 	ar9170_regwrite(AR9170_MAC_REG_SNIFFER, sniffer);
 	ar9170_regwrite_finish();

 	return ar9170_regwrite_result();
 }

 int ar9170_set_operating_mode(struct ar9170 *ar)
 {
 	u32 pm_mode = AR9170_MAC_REG_POWERMGT_DEFAULTS;
 	u8 *mac_addr, *bssid;
 	int err;

 	if (ar->vif) {
 		mac_addr = ar->mac_addr;
 		bssid = ar->bssid;

 		switch (ar->vif->type) {
 		case NL80211_IFTYPE_MESH_POINT:
 		case NL80211_IFTYPE_ADHOC:
 			pm_mode |= AR9170_MAC_REG_POWERMGT_IBSS;
 			break;
 		case NL80211_IFTYPE_AP:
 			pm_mode |= AR9170_MAC_REG_POWERMGT_AP;
 			break;
 		case NL80211_IFTYPE_WDS:
 			pm_mode |= AR9170_MAC_REG_POWERMGT_AP_WDS;
 			break;
 		case NL80211_IFTYPE_MONITOR:
 			ar->sniffer_enabled = true;
 			ar->rx_software_decryption = true;
 			break;
 		default:
 			pm_mode |= AR9170_MAC_REG_POWERMGT_STA;
 			break;
 		}
 	} else {
 		mac_addr = NULL;
 		bssid = NULL;
 	}

 	err = ar9170_set_mac_reg(ar, AR9170_MAC_REG_MAC_ADDR_L, mac_addr);
 	if (err)
 		return err;

 	err = ar9170_set_mac_reg(ar, AR9170_MAC_REG_BSSID_L, bssid);
 	if (err)
 		return err;

 	err = ar9170_set_promiscouous(ar);
 	if (err)
 		return err;

 	/* set AMPDU density to 8us. */
 	err = ar9170_set_ampdu_density(ar, 6);
 	if (err)
 		return err;

 	ar9170_regwrite_begin(ar);

 	ar9170_regwrite(AR9170_MAC_REG_POWERMANAGEMENT, pm_mode);
 	ar9170_regwrite_finish();

 	return ar9170_regwrite_result();
 }

 int ar9170_set_hwretry_limit(struct ar9170 *ar, unsigned int max_retry)
 {
 	u32 tmp = min_t(u32, 0x33333, max_retry * 0x11111);

 	return ar9170_write_reg(ar, AR9170_MAC_REG_RETRY_MAX, tmp);
 }

 int ar9170_set_beacon_timers(struct ar9170 *ar)
 {
 	u32 v = 0;
 	u32 pretbtt = 0;

 	if (ar->vif) {
 		v |= ar->vif->bss_conf.beacon_int;

 		if (ar->enable_beacon) {
 			switch (ar->vif->type) {
 			case NL80211_IFTYPE_MESH_POINT:
 			case NL80211_IFTYPE_ADHOC:
 				v |= BIT(25);
 				break;
 			case NL80211_IFTYPE_AP:
 				v |= BIT(24);
 				pretbtt = (ar->vif->bss_conf.beacon_int - 6) <<
 					  16;
 				break;
 			default:
 			break;
 			}
 		}

 		v |= ar->vif->bss_conf.dtim_period << 16;
 	}

 	ar9170_regwrite_begin(ar);
 	ar9170_regwrite(AR9170_MAC_REG_PRETBTT, pretbtt);
 	ar9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, v);
 	ar9170_regwrite_finish();
 	return ar9170_regwrite_result();
 }

 int ar9170_update_beacon(struct ar9170 *ar)
 {
 	struct sk_buff *skb;
 	__le32 *data, *old = NULL;
 	u32 word;
 	int i;

 	skb = ieee80211_beacon_get(ar->hw, ar->vif);
 	if (!skb)
 		return -ENOMEM;

 	data = (__le32 *)skb->data;
 	if (ar->beacon)
 		old = (__le32 *)ar->beacon->data;

 	ar9170_regwrite_begin(ar);
 	for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
 		/*
 		 * XXX: This accesses beyond skb data for up
 		 *	to the last 3 bytes!!
 		 */

 		if (old && (data[i] == old[i]))
 			continue;

 		word = le32_to_cpu(data[i]);
 		ar9170_regwrite(AR9170_BEACON_BUFFER_ADDRESS + 4 * i, word);
 	}

 	/* XXX: use skb->cb info */
 	if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ)
 		ar9170_regwrite(AR9170_MAC_REG_BCN_PLCP,
 				((skb->len + 4) << (3 + 16)) + 0x0400);
 	else
 		ar9170_regwrite(AR9170_MAC_REG_BCN_PLCP,
 				((skb->len + 4) << 16) + 0x001b);

 	ar9170_regwrite(AR9170_MAC_REG_BCN_LENGTH, skb->len + 4);
 	ar9170_regwrite(AR9170_MAC_REG_BCN_ADDR, AR9170_BEACON_BUFFER_ADDRESS);
 	ar9170_regwrite(AR9170_MAC_REG_BCN_CTRL, 1);

 	ar9170_regwrite_finish();

 	dev_kfree_skb(ar->beacon);
 	ar->beacon = skb;

 	return ar9170_regwrite_result();
 }

 void ar9170_new_beacon(struct work_struct *work)
 {
 	struct ar9170 *ar = container_of(work, struct ar9170,
 					 beacon_work);
 	struct sk_buff *skb;

 	if (unlikely(!IS_STARTED(ar)))
 		return ;

 	mutex_lock(&ar->mutex);

 	if (!ar->vif)
 		goto out;

 	ar9170_update_beacon(ar);

 	rcu_read_lock();
 	while ((skb = ieee80211_get_buffered_bc(ar->hw, ar->vif)))
 		ar9170_op_tx(ar->hw, skb);

 	rcu_read_unlock();

  out:
 	mutex_unlock(&ar->mutex);
 }

 int ar9170_upload_key(struct ar9170 *ar, u8 id, const u8 *mac, u8 ktype,
 		      u8 keyidx, u8 *keydata, int keylen)
 {
 	__le32 vals[7];
 	static const u8 bcast[ETH_ALEN] =
 		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 	u8 dummy;

 	mac = mac ? : bcast;

 	vals[0] = cpu_to_le32((keyidx << 16) + id);
 	vals[1] = cpu_to_le32(mac[1] << 24 | mac[0] << 16 | ktype);
 	vals[2] = cpu_to_le32(mac[5] << 24 | mac[4] << 16 |
 			      mac[3] << 8 | mac[2]);
 	memset(&vals[3], 0, 16);
 	if (keydata)
 		memcpy(&vals[3], keydata, keylen);

 	return ar->exec_cmd(ar, AR9170_CMD_EKEY,
 			    sizeof(vals), (u8 *)vals,
 			    1, &dummy);
 }

 int ar9170_disable_key(struct ar9170 *ar, u8 id)
 {
 	__le32 val = cpu_to_le32(id);
 	u8 dummy;

 	return ar->exec_cmd(ar, AR9170_CMD_EKEY,
 			    sizeof(val), (u8 *)&val,
 			    1, &dummy);
 }
	/*
	* Atheros AR9170 driver
	*
	* MAC programming
	*
	* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
	*
	* 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; see the file COPYING. If not, see
	* http://www.gnu.org/licenses/.
	*
	* This file incorporates work covered by the following copyright and
	* permission notice:
	* Copyright (c) 2007-2008 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 "ar9170.h"
	#include "cmd.h"

	int ar9170_set_dyn_sifs_ack(struct ar9170 *ar)
	{
	u32 val;

	if (conf_is_ht40(&ar->hw->conf))
	val = 0x010a;
	else {
	if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ)
	val = 0x105;
	else
	val = 0x104;
	}

	return ar9170_write_reg(ar, AR9170_MAC_REG_DYNAMIC_SIFS_ACK, val);
	}

	int ar9170_set_slot_time(struct ar9170 *ar)
	{
	u32 slottime = 20;

	if (!ar->vif)
	return 0;

	if ((ar->hw->conf.channel->band == IEEE80211_BAND_5GHZ) \|\|
	ar->vif->bss_conf.use_short_slot)
	slottime = 9;

	return ar9170_write_reg(ar, AR9170_MAC_REG_SLOT_TIME, slottime << 10);
	}

	int ar9170_set_basic_rates(struct ar9170 *ar)
	{
	u8 cck, ofdm;

	if (!ar->vif)
	return 0;

	ofdm = ar->vif->bss_conf.basic_rates >> 4;

	/* FIXME: is still necessary? */
	if (ar->hw->conf.channel->band == IEEE80211_BAND_5GHZ)
	cck = 0;
	else
	cck = ar->vif->bss_conf.basic_rates & 0xf;

	return ar9170_write_reg(ar, AR9170_MAC_REG_BASIC_RATE,
	ofdm << 8 \| cck);
	}

	int ar9170_set_qos(struct ar9170 *ar)
	{
	ar9170_regwrite_begin(ar);

	ar9170_regwrite(AR9170_MAC_REG_AC0_CW, ar->edcf[0].cw_min \|
	(ar->edcf[0].cw_max << 16));
	ar9170_regwrite(AR9170_MAC_REG_AC1_CW, ar->edcf[1].cw_min \|
	(ar->edcf[1].cw_max << 16));
	ar9170_regwrite(AR9170_MAC_REG_AC2_CW, ar->edcf[2].cw_min \|
	(ar->edcf[2].cw_max << 16));
	ar9170_regwrite(AR9170_MAC_REG_AC3_CW, ar->edcf[3].cw_min \|
	(ar->edcf[3].cw_max << 16));
	ar9170_regwrite(AR9170_MAC_REG_AC4_CW, ar->edcf[4].cw_min \|
	(ar->edcf[4].cw_max << 16));

	ar9170_regwrite(AR9170_MAC_REG_AC1_AC0_AIFS,
	((ar->edcf[0].aifs * 9 + 10)) \|
	((ar->edcf[1].aifs * 9 + 10) << 12) \|
	((ar->edcf[2].aifs * 9 + 10) << 24));
	ar9170_regwrite(AR9170_MAC_REG_AC3_AC2_AIFS,
	((ar->edcf[2].aifs * 9 + 10) >> 8) \|
	((ar->edcf[3].aifs * 9 + 10) << 4) \|
	((ar->edcf[4].aifs * 9 + 10) << 16));

	ar9170_regwrite(AR9170_MAC_REG_AC1_AC0_TXOP,
	ar->edcf[0].txop \| ar->edcf[1].txop << 16);
	ar9170_regwrite(AR9170_MAC_REG_AC3_AC2_TXOP,
	ar->edcf[1].txop \| ar->edcf[3].txop << 16);

	ar9170_regwrite_finish();

	return ar9170_regwrite_result();
	}

	static int ar9170_set_ampdu_density(struct ar9170 *ar, u8 mpdudensity)
	{
	u32 val;

	/* don't allow AMPDU density > 8us */
	if (mpdudensity > 6)
	return -EINVAL;

	/* Watch out! Otus uses slightly different density values. */
	val = 0x140a00 \| (mpdudensity ? (mpdudensity + 1) : 0);

	ar9170_regwrite_begin(ar);
	ar9170_regwrite(AR9170_MAC_REG_AMPDU_DENSITY, val);
	ar9170_regwrite_finish();

	return ar9170_regwrite_result();
	}

	int ar9170_init_mac(struct ar9170 *ar)
	{
	ar9170_regwrite_begin(ar);

	ar9170_regwrite(AR9170_MAC_REG_ACK_EXTENSION, 0x40);

	ar9170_regwrite(AR9170_MAC_REG_RETRY_MAX, 0);

	/* enable MMIC */
	ar9170_regwrite(AR9170_MAC_REG_SNIFFER,
	AR9170_MAC_REG_SNIFFER_DEFAULTS);

	ar9170_regwrite(AR9170_MAC_REG_RX_THRESHOLD, 0xc1f80);

	ar9170_regwrite(AR9170_MAC_REG_RX_PE_DELAY, 0x70);
	ar9170_regwrite(AR9170_MAC_REG_EIFS_AND_SIFS, 0xa144000);
	ar9170_regwrite(AR9170_MAC_REG_SLOT_TIME, 9 << 10);

	/* CF-END mode */
	ar9170_regwrite(0x1c3b2c, 0x19000000);

	/* NAV protects ACK only (in TXOP) */
	ar9170_regwrite(0x1c3b38, 0x201);

	/* Set Beacon PHY CTRL's TPC to 0x7, TA1=1 */
	/* OTUS set AM to 0x1 */
	ar9170_regwrite(AR9170_MAC_REG_BCN_HT1, 0x8000170);

	ar9170_regwrite(AR9170_MAC_REG_BACKOFF_PROTECT, 0x105);

	/* AGG test code*/
	/* Aggregation MAX number and timeout */
	ar9170_regwrite(0x1c3b9c, 0x10000a);

	ar9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
	AR9170_MAC_REG_FTF_DEFAULTS);

	/* Enable deaggregator, response in sniffer mode */
	ar9170_regwrite(0x1c3c40, 0x1 \| 1<<30);

	/* rate sets */
	ar9170_regwrite(AR9170_MAC_REG_BASIC_RATE, 0x150f);
	ar9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, 0x150f);
	ar9170_regwrite(AR9170_MAC_REG_RTS_CTS_RATE, 0x10b01bb);

	/* MIMO response control */
	ar9170_regwrite(0x1c3694, 0x4003C1E);/* bit 26~28 otus-AM */

	/* switch MAC to OTUS interface */
	ar9170_regwrite(0x1c3600, 0x3);

	ar9170_regwrite(AR9170_MAC_REG_AMPDU_RX_THRESH, 0xffff);

	/* set PHY register read timeout (??) */
	ar9170_regwrite(AR9170_MAC_REG_MISC_680, 0xf00008);

	/* Disable Rx TimeOut, workaround for BB. */
	ar9170_regwrite(AR9170_MAC_REG_RX_TIMEOUT, 0x0);

	/* Set CPU clock frequency to 88/80MHz */
	ar9170_regwrite(AR9170_PWR_REG_CLOCK_SEL,
	AR9170_PWR_CLK_AHB_80_88MHZ \|
	AR9170_PWR_CLK_DAC_160_INV_DLY);

	/* Set WLAN DMA interrupt mode: generate int per packet */
	ar9170_regwrite(AR9170_MAC_REG_TXRX_MPI, 0x110011);

	ar9170_regwrite(AR9170_MAC_REG_FCS_SELECT,
	AR9170_MAC_FCS_FIFO_PROT);

	/* Disables the CF_END frame, undocumented register */
	ar9170_regwrite(AR9170_MAC_REG_TXOP_NOT_ENOUGH_IND,
	0x141E0F48);

	ar9170_regwrite_finish();

	return ar9170_regwrite_result();
	}

	static int ar9170_set_mac_reg(struct ar9170 ar, const u32 reg, const u8 mac)
	{
	static const u8 zero[ETH_ALEN] = { 0 };

	if (!mac)
	mac = zero;

	ar9170_regwrite_begin(ar);

	ar9170_regwrite(reg,
	(mac[3] << 24) \| (mac[2] << 16) \|
	(mac[1] << 8) \| mac[0]);

	ar9170_regwrite(reg + 4, (mac[5] << 8) \| mac[4]);

	ar9170_regwrite_finish();

	return ar9170_regwrite_result();
	}

	int ar9170_update_multicast(struct ar9170 *ar, const u64 mc_hash)
	{
	int err;

	ar9170_regwrite_begin(ar);
	ar9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, mc_hash >> 32);
	ar9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, mc_hash);
	ar9170_regwrite_finish();
	err = ar9170_regwrite_result();
	if (err)
	return err;

	ar->cur_mc_hash = mc_hash;
	return 0;
	}

	int ar9170_update_frame_filter(struct ar9170 *ar, const u32 filter)
	{
	int err;

	err = ar9170_write_reg(ar, AR9170_MAC_REG_FRAMETYPE_FILTER, filter);
	if (err)
	return err;

	ar->cur_filter = filter;
	return 0;
	}

	static int ar9170_set_promiscouous(struct ar9170 *ar)
	{
	u32 encr_mode, sniffer;
	int err;

	err = ar9170_read_reg(ar, AR9170_MAC_REG_SNIFFER, &sniffer);
	if (err)
	return err;

	err = ar9170_read_reg(ar, AR9170_MAC_REG_ENCRYPTION, &encr_mode);
	if (err)
	return err;

	if (ar->sniffer_enabled) {
	sniffer \|= AR9170_MAC_REG_SNIFFER_ENABLE_PROMISC;

	/*
	* Rx decryption works in place.
	*
	* If we don't disable it, the hardware will render all
	* encrypted frames which are encrypted with an unknown
	* key useless.
	*/

	encr_mode \|= AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
	ar->sniffer_enabled = true;
	} else {
	sniffer &= ~AR9170_MAC_REG_SNIFFER_ENABLE_PROMISC;

	if (ar->rx_software_decryption)
	encr_mode \|= AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
	else
	encr_mode &= ~AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
	}

	ar9170_regwrite_begin(ar);
	ar9170_regwrite(AR9170_MAC_REG_ENCRYPTION, encr_mode);
	ar9170_regwrite(AR9170_MAC_REG_SNIFFER, sniffer);
	ar9170_regwrite_finish();

	return ar9170_regwrite_result();
	}

	int ar9170_set_operating_mode(struct ar9170 *ar)
	{
	u32 pm_mode = AR9170_MAC_REG_POWERMGT_DEFAULTS;
	u8 mac_addr, bssid;
	int err;

	if (ar->vif) {
	mac_addr = ar->mac_addr;
	bssid = ar->bssid;

	switch (ar->vif->type) {
	case NL80211_IFTYPE_MESH_POINT:
	case NL80211_IFTYPE_ADHOC:
	pm_mode \|= AR9170_MAC_REG_POWERMGT_IBSS;
	break;
	case NL80211_IFTYPE_AP:
	pm_mode \|= AR9170_MAC_REG_POWERMGT_AP;
	break;
	case NL80211_IFTYPE_WDS:
	pm_mode \|= AR9170_MAC_REG_POWERMGT_AP_WDS;
	break;
	case NL80211_IFTYPE_MONITOR:
	ar->sniffer_enabled = true;
	ar->rx_software_decryption = true;
	break;
	default:
	pm_mode \|= AR9170_MAC_REG_POWERMGT_STA;
	break;
	}
	} else {
	mac_addr = NULL;
	bssid = NULL;
	}

	err = ar9170_set_mac_reg(ar, AR9170_MAC_REG_MAC_ADDR_L, mac_addr);
	if (err)
	return err;

	err = ar9170_set_mac_reg(ar, AR9170_MAC_REG_BSSID_L, bssid);
	if (err)
	return err;

	err = ar9170_set_promiscouous(ar);
	if (err)
	return err;

	/* set AMPDU density to 8us. */
	err = ar9170_set_ampdu_density(ar, 6);
	if (err)
	return err;

	ar9170_regwrite_begin(ar);

	ar9170_regwrite(AR9170_MAC_REG_POWERMANAGEMENT, pm_mode);
	ar9170_regwrite_finish();

	return ar9170_regwrite_result();
	}

	int ar9170_set_hwretry_limit(struct ar9170 *ar, unsigned int max_retry)
	{
	u32 tmp = min_t(u32, 0x33333, max_retry * 0x11111);

	return ar9170_write_reg(ar, AR9170_MAC_REG_RETRY_MAX, tmp);
	}

	int ar9170_set_beacon_timers(struct ar9170 *ar)
	{
	u32 v = 0;
	u32 pretbtt = 0;

	if (ar->vif) {
	v \|= ar->vif->bss_conf.beacon_int;

	if (ar->enable_beacon) {
	switch (ar->vif->type) {
	case NL80211_IFTYPE_MESH_POINT:
	case NL80211_IFTYPE_ADHOC:
	v \|= BIT(25);
	break;
	case NL80211_IFTYPE_AP:
	v \|= BIT(24);
	pretbtt = (ar->vif->bss_conf.beacon_int - 6) <<
	16;
	break;
	default:
	break;
	}
	}

	v \|= ar->vif->bss_conf.dtim_period << 16;
	}

	ar9170_regwrite_begin(ar);
	ar9170_regwrite(AR9170_MAC_REG_PRETBTT, pretbtt);
	ar9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, v);
	ar9170_regwrite_finish();
	return ar9170_regwrite_result();
	}

	int ar9170_update_beacon(struct ar9170 *ar)
	{
	struct sk_buff *skb;
	__le32 data, old = NULL;
	u32 word;
	int i;

	skb = ieee80211_beacon_get(ar->hw, ar->vif);
	if (!skb)
	return -ENOMEM;

	data = (__le32 *)skb->data;
	if (ar->beacon)
	old = (__le32 *)ar->beacon->data;

	ar9170_regwrite_begin(ar);
	for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
	/*
	* XXX: This accesses beyond skb data for up
	* to the last 3 bytes!!
	*/

	if (old && (data[i] == old[i]))
	continue;

	word = le32_to_cpu(data[i]);
	ar9170_regwrite(AR9170_BEACON_BUFFER_ADDRESS + 4 * i, word);
	}

	/* XXX: use skb->cb info */
	if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ)
	ar9170_regwrite(AR9170_MAC_REG_BCN_PLCP,
	((skb->len + 4) << (3 + 16)) + 0x0400);
	else
	ar9170_regwrite(AR9170_MAC_REG_BCN_PLCP,
	((skb->len + 4) << 16) + 0x001b);

	ar9170_regwrite(AR9170_MAC_REG_BCN_LENGTH, skb->len + 4);
	ar9170_regwrite(AR9170_MAC_REG_BCN_ADDR, AR9170_BEACON_BUFFER_ADDRESS);
	ar9170_regwrite(AR9170_MAC_REG_BCN_CTRL, 1);

	ar9170_regwrite_finish();

	dev_kfree_skb(ar->beacon);
	ar->beacon = skb;

	return ar9170_regwrite_result();
	}

	void ar9170_new_beacon(struct work_struct *work)
	{
	struct ar9170 *ar = container_of(work, struct ar9170,
	beacon_work);
	struct sk_buff *skb;

	if (unlikely(!IS_STARTED(ar)))
	return ;

	mutex_lock(&ar->mutex);

	if (!ar->vif)
	goto out;

	ar9170_update_beacon(ar);

	rcu_read_lock();
	while ((skb = ieee80211_get_buffered_bc(ar->hw, ar->vif)))
	ar9170_op_tx(ar->hw, skb);

	rcu_read_unlock();

	out:
	mutex_unlock(&ar->mutex);
	}

	int ar9170_upload_key(struct ar9170 ar, u8 id, const u8 mac, u8 ktype,
	u8 keyidx, u8 *keydata, int keylen)
	{
	__le32 vals[7];
	static const u8 bcast[ETH_ALEN] =
	{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
	u8 dummy;

	mac = mac ? : bcast;

	vals[0] = cpu_to_le32((keyidx << 16) + id);
	vals[1] = cpu_to_le32(mac[1] << 24 \| mac[0] << 16 \| ktype);
	vals[2] = cpu_to_le32(mac[5] << 24 \| mac[4] << 16 \|
	mac[3] << 8 \| mac[2]);
	memset(&vals[3], 0, 16);
	if (keydata)
	memcpy(&vals[3], keydata, keylen);

	return ar->exec_cmd(ar, AR9170_CMD_EKEY,
	sizeof(vals), (u8 *)vals,
	1, &dummy);
	}

	int ar9170_disable_key(struct ar9170 *ar, u8 id)
	{
	__le32 val = cpu_to_le32(id);
	u8 dummy;

	return ar->exec_cmd(ar, AR9170_CMD_EKEY,
	sizeof(val), (u8 *)&val,
	1, &dummy);
	}