drivers/net/wireless/ath/ath9k/common-init.c - linux - Git at Google

 /*
  * Copyright (c) 2008-2011 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.
  */

 /* We use the hw_value as an index into our private channel structure */

 #include "common.h"

 #define CHAN2G(_freq, _idx)  { \
 	.band = NL80211_BAND_2GHZ, \
 	.center_freq = (_freq), \
 	.hw_value = (_idx), \
 	.max_power = 20, \
 }

 #define CHAN5G(_freq, _idx) { \
 	.band = NL80211_BAND_5GHZ, \
 	.center_freq = (_freq), \
 	.hw_value = (_idx), \
 	.max_power = 20, \
 }

 /* Some 2 GHz radios are actually tunable on 2312-2732
  * on 5 MHz steps, we support the channels which we know
  * we have calibration data for all cards though to make
  * this static */
 static const struct ieee80211_channel ath9k_2ghz_chantable[] = {
 	CHAN2G(2412, 0), /* Channel 1 */
 	CHAN2G(2417, 1), /* Channel 2 */
 	CHAN2G(2422, 2), /* Channel 3 */
 	CHAN2G(2427, 3), /* Channel 4 */
 	CHAN2G(2432, 4), /* Channel 5 */
 	CHAN2G(2437, 5), /* Channel 6 */
 	CHAN2G(2442, 6), /* Channel 7 */
 	CHAN2G(2447, 7), /* Channel 8 */
 	CHAN2G(2452, 8), /* Channel 9 */
 	CHAN2G(2457, 9), /* Channel 10 */
 	CHAN2G(2462, 10), /* Channel 11 */
 	CHAN2G(2467, 11), /* Channel 12 */
 	CHAN2G(2472, 12), /* Channel 13 */
 	CHAN2G(2484, 13), /* Channel 14 */
 };

 /* Some 5 GHz radios are actually tunable on XXXX-YYYY
  * on 5 MHz steps, we support the channels which we know
  * we have calibration data for all cards though to make
  * this static */
 static const struct ieee80211_channel ath9k_5ghz_chantable[] = {
 	/* _We_ call this UNII 1 */
 	CHAN5G(5180, 14), /* Channel 36 */
 	CHAN5G(5200, 15), /* Channel 40 */
 	CHAN5G(5220, 16), /* Channel 44 */
 	CHAN5G(5240, 17), /* Channel 48 */
 	/* _We_ call this UNII 2 */
 	CHAN5G(5260, 18), /* Channel 52 */
 	CHAN5G(5280, 19), /* Channel 56 */
 	CHAN5G(5300, 20), /* Channel 60 */
 	CHAN5G(5320, 21), /* Channel 64 */
 	/* _We_ call this "Middle band" */
 	CHAN5G(5500, 22), /* Channel 100 */
 	CHAN5G(5520, 23), /* Channel 104 */
 	CHAN5G(5540, 24), /* Channel 108 */
 	CHAN5G(5560, 25), /* Channel 112 */
 	CHAN5G(5580, 26), /* Channel 116 */
 	CHAN5G(5600, 27), /* Channel 120 */
 	CHAN5G(5620, 28), /* Channel 124 */
 	CHAN5G(5640, 29), /* Channel 128 */
 	CHAN5G(5660, 30), /* Channel 132 */
 	CHAN5G(5680, 31), /* Channel 136 */
 	CHAN5G(5700, 32), /* Channel 140 */
 	/* _We_ call this UNII 3 */
 	CHAN5G(5745, 33), /* Channel 149 */
 	CHAN5G(5765, 34), /* Channel 153 */
 	CHAN5G(5785, 35), /* Channel 157 */
 	CHAN5G(5805, 36), /* Channel 161 */
 	CHAN5G(5825, 37), /* Channel 165 */
 };

 /* Atheros hardware rate code addition for short preamble */
 #define SHPCHECK(__hw_rate, __flags) \
 	((__flags & IEEE80211_RATE_SHORT_PREAMBLE) ? (__hw_rate | 0x04 ) : 0)

 #define RATE(_bitrate, _hw_rate, _flags) {              \
 	.bitrate        = (_bitrate),                   \
 	.flags          = (_flags),                     \
 	.hw_value       = (_hw_rate),                   \
 	.hw_value_short = (SHPCHECK(_hw_rate, _flags))  \
 }

 static struct ieee80211_rate ath9k_legacy_rates[] = {
 	RATE(10, 0x1b, 0),
 	RATE(20, 0x1a, IEEE80211_RATE_SHORT_PREAMBLE),
 	RATE(55, 0x19, IEEE80211_RATE_SHORT_PREAMBLE),
 	RATE(110, 0x18, IEEE80211_RATE_SHORT_PREAMBLE),
 	RATE(60, 0x0b, (IEEE80211_RATE_SUPPORTS_5MHZ |
 			IEEE80211_RATE_SUPPORTS_10MHZ)),
 	RATE(90, 0x0f, (IEEE80211_RATE_SUPPORTS_5MHZ |
 			IEEE80211_RATE_SUPPORTS_10MHZ)),
 	RATE(120, 0x0a, (IEEE80211_RATE_SUPPORTS_5MHZ |
 			 IEEE80211_RATE_SUPPORTS_10MHZ)),
 	RATE(180, 0x0e, (IEEE80211_RATE_SUPPORTS_5MHZ |
 			 IEEE80211_RATE_SUPPORTS_10MHZ)),
 	RATE(240, 0x09, (IEEE80211_RATE_SUPPORTS_5MHZ |
 			 IEEE80211_RATE_SUPPORTS_10MHZ)),
 	RATE(360, 0x0d, (IEEE80211_RATE_SUPPORTS_5MHZ |
 			 IEEE80211_RATE_SUPPORTS_10MHZ)),
 	RATE(480, 0x08, (IEEE80211_RATE_SUPPORTS_5MHZ |
 			 IEEE80211_RATE_SUPPORTS_10MHZ)),
 	RATE(540, 0x0c, (IEEE80211_RATE_SUPPORTS_5MHZ |
 			 IEEE80211_RATE_SUPPORTS_10MHZ)),
 };

 int ath9k_cmn_init_channels_rates(struct ath_common *common)
 {
 	struct ath_hw *ah = common->ah;
 	void *channels;

 	BUILD_BUG_ON(ARRAY_SIZE(ath9k_2ghz_chantable) +
 		     ARRAY_SIZE(ath9k_5ghz_chantable) !=
 		     ATH9K_NUM_CHANNELS);

 	if (ah->caps.hw_caps & ATH9K_HW_CAP_2GHZ) {
 		channels = devm_kzalloc(ah->dev,
 			sizeof(ath9k_2ghz_chantable), GFP_KERNEL);
 		if (!channels)
 		    return -ENOMEM;

 		memcpy(channels, ath9k_2ghz_chantable,
 		       sizeof(ath9k_2ghz_chantable));
 		common->sbands[NL80211_BAND_2GHZ].channels = channels;
 		common->sbands[NL80211_BAND_2GHZ].band = NL80211_BAND_2GHZ;
 		common->sbands[NL80211_BAND_2GHZ].n_channels =
 			ARRAY_SIZE(ath9k_2ghz_chantable);
 		common->sbands[NL80211_BAND_2GHZ].bitrates = ath9k_legacy_rates;
 		common->sbands[NL80211_BAND_2GHZ].n_bitrates =
 			ARRAY_SIZE(ath9k_legacy_rates);
 	}

 	if (ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ) {
 		channels = devm_kzalloc(ah->dev,
 			sizeof(ath9k_5ghz_chantable), GFP_KERNEL);
 		if (!channels)
 			return -ENOMEM;

 		memcpy(channels, ath9k_5ghz_chantable,
 		       sizeof(ath9k_5ghz_chantable));
 		common->sbands[NL80211_BAND_5GHZ].channels = channels;
 		common->sbands[NL80211_BAND_5GHZ].band = NL80211_BAND_5GHZ;
 		common->sbands[NL80211_BAND_5GHZ].n_channels =
 			ARRAY_SIZE(ath9k_5ghz_chantable);
 		common->sbands[NL80211_BAND_5GHZ].bitrates =
 			ath9k_legacy_rates + 4;
 		common->sbands[NL80211_BAND_5GHZ].n_bitrates =
 			ARRAY_SIZE(ath9k_legacy_rates) - 4;
 	}
 	return 0;
 }
 EXPORT_SYMBOL(ath9k_cmn_init_channels_rates);

 void ath9k_cmn_setup_ht_cap(struct ath_hw *ah,
 			    struct ieee80211_sta_ht_cap *ht_info)
 {
 	struct ath_common *common = ath9k_hw_common(ah);
 	u8 tx_streams, rx_streams;
 	int i, max_streams;

 	ht_info->ht_supported = true;
 	ht_info->cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 		       IEEE80211_HT_CAP_SM_PS |
 		       IEEE80211_HT_CAP_SGI_40 |
 		       IEEE80211_HT_CAP_DSSSCCK40;

 	if (ah->caps.hw_caps & ATH9K_HW_CAP_LDPC)
 		ht_info->cap |= IEEE80211_HT_CAP_LDPC_CODING;

 	if (ah->caps.hw_caps & ATH9K_HW_CAP_SGI_20)
 		ht_info->cap |= IEEE80211_HT_CAP_SGI_20;

 	ht_info->ampdu_factor = IEEE80211_HT_MAX_AMPDU_64K;
 	ht_info->ampdu_density = IEEE80211_HT_MPDU_DENSITY_8;

 	if (AR_SREV_9271(ah) || AR_SREV_9330(ah) || AR_SREV_9485(ah) || AR_SREV_9565(ah))
 		max_streams = 1;
 	else if (AR_SREV_9462(ah))
 		max_streams = 2;
 	else if (AR_SREV_9300_20_OR_LATER(ah))
 		max_streams = 3;
 	else
 		max_streams = 2;

 	if (AR_SREV_9280_20_OR_LATER(ah)) {
 		if (max_streams >= 2)
 			ht_info->cap |= IEEE80211_HT_CAP_TX_STBC;
 		ht_info->cap |= (1 << IEEE80211_HT_CAP_RX_STBC_SHIFT);
 	}

 	/* set up supported mcs set */
 	memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
 	tx_streams = ath9k_cmn_count_streams(ah->txchainmask, max_streams);
 	rx_streams = ath9k_cmn_count_streams(ah->rxchainmask, max_streams);

 	ath_dbg(common, CONFIG, "TX streams %d, RX streams: %d\n",
 		tx_streams, rx_streams);

 	if (tx_streams != rx_streams) {
 		ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
 		ht_info->mcs.tx_params |= ((tx_streams - 1) <<
 				IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
 	}

 	for (i = 0; i < rx_streams; i++)
 		ht_info->mcs.rx_mask[i] = 0xff;

 	ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_DEFINED;
 }
 EXPORT_SYMBOL(ath9k_cmn_setup_ht_cap);

 void ath9k_cmn_reload_chainmask(struct ath_hw *ah)
 {
 	struct ath_common *common = ath9k_hw_common(ah);

 	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_HT))
 		return;

 	if (ah->caps.hw_caps & ATH9K_HW_CAP_2GHZ)
 		ath9k_cmn_setup_ht_cap(ah,
 			&common->sbands[NL80211_BAND_2GHZ].ht_cap);
 	if (ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ)
 		ath9k_cmn_setup_ht_cap(ah,
 			&common->sbands[NL80211_BAND_5GHZ].ht_cap);
 }
 EXPORT_SYMBOL(ath9k_cmn_reload_chainmask);
	/*
	* Copyright (c) 2008-2011 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.
	*/

	/* We use the hw_value as an index into our private channel structure */

	#include "common.h"

	#define CHAN2G(_freq, _idx) { \
	.band = NL80211_BAND_2GHZ, \
	.center_freq = (_freq), \
	.hw_value = (_idx), \
	.max_power = 20, \
	}

	#define CHAN5G(_freq, _idx) { \
	.band = NL80211_BAND_5GHZ, \
	.center_freq = (_freq), \
	.hw_value = (_idx), \
	.max_power = 20, \
	}

	/* Some 2 GHz radios are actually tunable on 2312-2732
	* on 5 MHz steps, we support the channels which we know
	* we have calibration data for all cards though to make
	* this static */
	static const struct ieee80211_channel ath9k_2ghz_chantable[] = {
	CHAN2G(2412, 0), /* Channel 1 */
	CHAN2G(2417, 1), /* Channel 2 */
	CHAN2G(2422, 2), /* Channel 3 */
	CHAN2G(2427, 3), /* Channel 4 */
	CHAN2G(2432, 4), /* Channel 5 */
	CHAN2G(2437, 5), /* Channel 6 */
	CHAN2G(2442, 6), /* Channel 7 */
	CHAN2G(2447, 7), /* Channel 8 */
	CHAN2G(2452, 8), /* Channel 9 */
	CHAN2G(2457, 9), /* Channel 10 */
	CHAN2G(2462, 10), /* Channel 11 */
	CHAN2G(2467, 11), /* Channel 12 */
	CHAN2G(2472, 12), /* Channel 13 */
	CHAN2G(2484, 13), /* Channel 14 */
	};

	/* Some 5 GHz radios are actually tunable on XXXX-YYYY
	* on 5 MHz steps, we support the channels which we know
	* we have calibration data for all cards though to make
	* this static */
	static const struct ieee80211_channel ath9k_5ghz_chantable[] = {
	/* _We_ call this UNII 1 */
	CHAN5G(5180, 14), /* Channel 36 */
	CHAN5G(5200, 15), /* Channel 40 */
	CHAN5G(5220, 16), /* Channel 44 */
	CHAN5G(5240, 17), /* Channel 48 */
	/* _We_ call this UNII 2 */
	CHAN5G(5260, 18), /* Channel 52 */
	CHAN5G(5280, 19), /* Channel 56 */
	CHAN5G(5300, 20), /* Channel 60 */
	CHAN5G(5320, 21), /* Channel 64 */
	/* _We_ call this "Middle band" */
	CHAN5G(5500, 22), /* Channel 100 */
	CHAN5G(5520, 23), /* Channel 104 */
	CHAN5G(5540, 24), /* Channel 108 */
	CHAN5G(5560, 25), /* Channel 112 */
	CHAN5G(5580, 26), /* Channel 116 */
	CHAN5G(5600, 27), /* Channel 120 */
	CHAN5G(5620, 28), /* Channel 124 */
	CHAN5G(5640, 29), /* Channel 128 */
	CHAN5G(5660, 30), /* Channel 132 */
	CHAN5G(5680, 31), /* Channel 136 */
	CHAN5G(5700, 32), /* Channel 140 */
	/* _We_ call this UNII 3 */
	CHAN5G(5745, 33), /* Channel 149 */
	CHAN5G(5765, 34), /* Channel 153 */
	CHAN5G(5785, 35), /* Channel 157 */
	CHAN5G(5805, 36), /* Channel 161 */
	CHAN5G(5825, 37), /* Channel 165 */
	};

	/* Atheros hardware rate code addition for short preamble */
	#define SHPCHECK(__hw_rate, __flags) \
	((__flags & IEEE80211_RATE_SHORT_PREAMBLE) ? (__hw_rate \| 0x04 ) : 0)

	#define RATE(_bitrate, _hw_rate, _flags) { \
	.bitrate = (_bitrate), \
	.flags = (_flags), \
	.hw_value = (_hw_rate), \
	.hw_value_short = (SHPCHECK(_hw_rate, _flags)) \
	}

	static struct ieee80211_rate ath9k_legacy_rates[] = {
	RATE(10, 0x1b, 0),
	RATE(20, 0x1a, IEEE80211_RATE_SHORT_PREAMBLE),
	RATE(55, 0x19, IEEE80211_RATE_SHORT_PREAMBLE),
	RATE(110, 0x18, IEEE80211_RATE_SHORT_PREAMBLE),
	RATE(60, 0x0b, (IEEE80211_RATE_SUPPORTS_5MHZ \|
	IEEE80211_RATE_SUPPORTS_10MHZ)),
	RATE(90, 0x0f, (IEEE80211_RATE_SUPPORTS_5MHZ \|
	IEEE80211_RATE_SUPPORTS_10MHZ)),
	RATE(120, 0x0a, (IEEE80211_RATE_SUPPORTS_5MHZ \|
	IEEE80211_RATE_SUPPORTS_10MHZ)),
	RATE(180, 0x0e, (IEEE80211_RATE_SUPPORTS_5MHZ \|
	IEEE80211_RATE_SUPPORTS_10MHZ)),
	RATE(240, 0x09, (IEEE80211_RATE_SUPPORTS_5MHZ \|
	IEEE80211_RATE_SUPPORTS_10MHZ)),
	RATE(360, 0x0d, (IEEE80211_RATE_SUPPORTS_5MHZ \|
	IEEE80211_RATE_SUPPORTS_10MHZ)),
	RATE(480, 0x08, (IEEE80211_RATE_SUPPORTS_5MHZ \|
	IEEE80211_RATE_SUPPORTS_10MHZ)),
	RATE(540, 0x0c, (IEEE80211_RATE_SUPPORTS_5MHZ \|
	IEEE80211_RATE_SUPPORTS_10MHZ)),
	};

	int ath9k_cmn_init_channels_rates(struct ath_common *common)
	{
	struct ath_hw *ah = common->ah;
	void *channels;

	BUILD_BUG_ON(ARRAY_SIZE(ath9k_2ghz_chantable) +
	ARRAY_SIZE(ath9k_5ghz_chantable) !=
	ATH9K_NUM_CHANNELS);

	if (ah->caps.hw_caps & ATH9K_HW_CAP_2GHZ) {
	channels = devm_kzalloc(ah->dev,
	sizeof(ath9k_2ghz_chantable), GFP_KERNEL);
	if (!channels)
	return -ENOMEM;

	memcpy(channels, ath9k_2ghz_chantable,
	sizeof(ath9k_2ghz_chantable));
	common->sbands[NL80211_BAND_2GHZ].channels = channels;
	common->sbands[NL80211_BAND_2GHZ].band = NL80211_BAND_2GHZ;
	common->sbands[NL80211_BAND_2GHZ].n_channels =
	ARRAY_SIZE(ath9k_2ghz_chantable);
	common->sbands[NL80211_BAND_2GHZ].bitrates = ath9k_legacy_rates;
	common->sbands[NL80211_BAND_2GHZ].n_bitrates =
	ARRAY_SIZE(ath9k_legacy_rates);
	}

	if (ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ) {
	channels = devm_kzalloc(ah->dev,
	sizeof(ath9k_5ghz_chantable), GFP_KERNEL);
	if (!channels)
	return -ENOMEM;

	memcpy(channels, ath9k_5ghz_chantable,
	sizeof(ath9k_5ghz_chantable));
	common->sbands[NL80211_BAND_5GHZ].channels = channels;
	common->sbands[NL80211_BAND_5GHZ].band = NL80211_BAND_5GHZ;
	common->sbands[NL80211_BAND_5GHZ].n_channels =
	ARRAY_SIZE(ath9k_5ghz_chantable);
	common->sbands[NL80211_BAND_5GHZ].bitrates =
	ath9k_legacy_rates + 4;
	common->sbands[NL80211_BAND_5GHZ].n_bitrates =
	ARRAY_SIZE(ath9k_legacy_rates) - 4;
	}
	return 0;
	}
	EXPORT_SYMBOL(ath9k_cmn_init_channels_rates);

	void ath9k_cmn_setup_ht_cap(struct ath_hw *ah,
	struct ieee80211_sta_ht_cap *ht_info)
	{
	struct ath_common *common = ath9k_hw_common(ah);
	u8 tx_streams, rx_streams;
	int i, max_streams;

	ht_info->ht_supported = true;
	ht_info->cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 \|
	IEEE80211_HT_CAP_SM_PS \|
	IEEE80211_HT_CAP_SGI_40 \|
	IEEE80211_HT_CAP_DSSSCCK40;

	if (ah->caps.hw_caps & ATH9K_HW_CAP_LDPC)
	ht_info->cap \|= IEEE80211_HT_CAP_LDPC_CODING;

	if (ah->caps.hw_caps & ATH9K_HW_CAP_SGI_20)
	ht_info->cap \|= IEEE80211_HT_CAP_SGI_20;

	ht_info->ampdu_factor = IEEE80211_HT_MAX_AMPDU_64K;
	ht_info->ampdu_density = IEEE80211_HT_MPDU_DENSITY_8;

	if (AR_SREV_9271(ah) \|\| AR_SREV_9330(ah) \|\| AR_SREV_9485(ah) \|\| AR_SREV_9565(ah))
	max_streams = 1;
	else if (AR_SREV_9462(ah))
	max_streams = 2;
	else if (AR_SREV_9300_20_OR_LATER(ah))
	max_streams = 3;
	else
	max_streams = 2;

	if (AR_SREV_9280_20_OR_LATER(ah)) {
	if (max_streams >= 2)
	ht_info->cap \|= IEEE80211_HT_CAP_TX_STBC;
	ht_info->cap \|= (1 << IEEE80211_HT_CAP_RX_STBC_SHIFT);
	}

	/* set up supported mcs set */
	memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
	tx_streams = ath9k_cmn_count_streams(ah->txchainmask, max_streams);
	rx_streams = ath9k_cmn_count_streams(ah->rxchainmask, max_streams);

	ath_dbg(common, CONFIG, "TX streams %d, RX streams: %d\n",
	tx_streams, rx_streams);

	if (tx_streams != rx_streams) {
	ht_info->mcs.tx_params \|= IEEE80211_HT_MCS_TX_RX_DIFF;
	ht_info->mcs.tx_params \|= ((tx_streams - 1) <<
	IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
	}

	for (i = 0; i < rx_streams; i++)
	ht_info->mcs.rx_mask[i] = 0xff;

	ht_info->mcs.tx_params \|= IEEE80211_HT_MCS_TX_DEFINED;
	}
	EXPORT_SYMBOL(ath9k_cmn_setup_ht_cap);

	void ath9k_cmn_reload_chainmask(struct ath_hw *ah)
	{
	struct ath_common *common = ath9k_hw_common(ah);

	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_HT))
	return;

	if (ah->caps.hw_caps & ATH9K_HW_CAP_2GHZ)
	ath9k_cmn_setup_ht_cap(ah,
	&common->sbands[NL80211_BAND_2GHZ].ht_cap);
	if (ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ)
	ath9k_cmn_setup_ht_cap(ah,
	&common->sbands[NL80211_BAND_5GHZ].ht_cap);
	}
	EXPORT_SYMBOL(ath9k_cmn_reload_chainmask);