linux/drivers/net/wireless/iwlwifi/iwl-core.c

/******************************************************************************
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 * Tomas Winkler <tomas.winkler@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/version.h>
#include <net/mac80211.h>

struct iwl_priv; /* FIXME: remove */
#include "iwl-debug.h"
#include "iwl-eeprom.h"
#include "iwl-dev.h" /* FIXME: remove */
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-rfkill.h"
#include "iwl-power.h"


MODULE_DESCRIPTION("iwl core");
MODULE_VERSION(IWLWIFI_VERSION);
MODULE_AUTHOR(DRV_COPYRIGHT);
MODULE_LICENSE("GPL");

#ifdef CONFIG_IWLWIFI_DEBUG
u32 iwl_debug_level;
EXPORT_SYMBOL(iwl_debug_level);
#endif

#define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
	[IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
				    IWL_RATE_SISO_##s##M_PLCP, \
				    IWL_RATE_MIMO2_##s##M_PLCP,\
				    IWL_RATE_MIMO3_##s##M_PLCP,\
				    IWL_RATE_##r##M_IEEE,      \
				    IWL_RATE_##ip##M_INDEX,    \
				    IWL_RATE_##in##M_INDEX,    \
				    IWL_RATE_##rp##M_INDEX,    \
				    IWL_RATE_##rn##M_INDEX,    \
				    IWL_RATE_##pp##M_INDEX,    \
				    IWL_RATE_##np##M_INDEX }

/*
 * Parameter order:
 *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
 *
 * If there isn't a valid next or previous rate then INV is used which
 * maps to IWL_RATE_INVALID
 *
 */
const struct iwl4965_rate_info iwl4965_rates[IWL_RATE_COUNT] = {
	IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
	IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
	IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
	IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
	IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
	IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
	IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
	IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
	IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
	IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
	IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
	IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
	IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
	/* FIXME:RS:          ^^    should be INV (legacy) */
};
EXPORT_SYMBOL(iwl4965_rates);

/* This function both allocates and initializes hw and priv. */
struct ieee80211_hw *iwl_alloc_all(struct iwl_cfg *cfg,
		struct ieee80211_ops *hw_ops)
{
	struct iwl_priv *priv;

	/* mac80211 allocates memory for this device instance, including
	 *   space for this driver's private structure */
	struct ieee80211_hw *hw =
		ieee80211_alloc_hw(sizeof(struct iwl_priv), hw_ops);
	if (hw == NULL) {
		IWL_ERROR("Can not allocate network device\n");
		goto out;
	}

	priv = hw->priv;
	priv->hw = hw;

out:
	return hw;
}
EXPORT_SYMBOL(iwl_alloc_all);

void iwl_hw_detect(struct iwl_priv *priv)
{
	priv->hw_rev = _iwl_read32(priv, CSR_HW_REV);
	priv->hw_wa_rev = _iwl_read32(priv, CSR_HW_REV_WA_REG);
	pci_read_config_byte(priv->pci_dev, PCI_REVISION_ID, &priv->rev_id);
}
EXPORT_SYMBOL(iwl_hw_detect);

/* Tell nic where to find the "keep warm" buffer */
int iwl_kw_init(struct iwl_priv *priv)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&priv->lock, flags);
	ret = iwl_grab_nic_access(priv);
	if (ret)
		goto out;

	iwl_write_direct32(priv, FH_KW_MEM_ADDR_REG,
			     priv->kw.dma_addr >> 4);
	iwl_release_nic_access(priv);
out:
	spin_unlock_irqrestore(&priv->lock, flags);
	return ret;
}

int iwl_kw_alloc(struct iwl_priv *priv)
{
	struct pci_dev *dev = priv->pci_dev;
	struct iwl4965_kw *kw = &priv->kw;

	kw->size = IWL4965_KW_SIZE;	/* TBW need set somewhere else */
	kw->v_addr = pci_alloc_consistent(dev, kw->size, &kw->dma_addr);
	if (!kw->v_addr)
		return -ENOMEM;

	return 0;
}

/**
 * iwl_kw_free - Free the "keep warm" buffer
 */
void iwl_kw_free(struct iwl_priv *priv)
{
	struct pci_dev *dev = priv->pci_dev;
	struct iwl4965_kw *kw = &priv->kw;

	if (kw->v_addr) {
		pci_free_consistent(dev, kw->size, kw->v_addr, kw->dma_addr);
		memset(kw, 0, sizeof(*kw));
	}
}

int iwl_hw_nic_init(struct iwl_priv *priv)
{
	unsigned long flags;
	struct iwl_rx_queue *rxq = &priv->rxq;
	int ret;

	/* nic_init */
	priv->cfg->ops->lib->apm_ops.init(priv);

	spin_lock_irqsave(&priv->lock, flags);
	iwl_write32(priv, CSR_INT_COALESCING, 512 / 32);
	spin_unlock_irqrestore(&priv->lock, flags);

	ret = priv->cfg->ops->lib->apm_ops.set_pwr_src(priv, IWL_PWR_SRC_VMAIN);

	priv->cfg->ops->lib->apm_ops.config(priv);

	/* Allocate the RX queue, or reset if it is already allocated */
	if (!rxq->bd) {
		ret = iwl_rx_queue_alloc(priv);
		if (ret) {
			IWL_ERROR("Unable to initialize Rx queue\n");
			return -ENOMEM;
		}
	} else
		iwl_rx_queue_reset(priv, rxq);

	iwl_rx_replenish(priv);

	iwl_rx_init(priv, rxq);

	spin_lock_irqsave(&priv->lock, flags);

	rxq->need_update = 1;
	iwl_rx_queue_update_write_ptr(priv, rxq);

	spin_unlock_irqrestore(&priv->lock, flags);

	/* Allocate and init all Tx and Command queues */
	ret = iwl_txq_ctx_reset(priv);
	if (ret)
		return ret;

	set_bit(STATUS_INIT, &priv->status);

	return 0;
}
EXPORT_SYMBOL(iwl_hw_nic_init);

/**
 * iwlcore_clear_stations_table - Clear the driver's station table
 *
 * NOTE:  This does not clear or otherwise alter the device's station table.
 */
void iwlcore_clear_stations_table(struct iwl_priv *priv)
{
	unsigned long flags;

	spin_lock_irqsave(&priv->sta_lock, flags);

	priv->num_stations = 0;
	memset(priv->stations, 0, sizeof(priv->stations));

	spin_unlock_irqrestore(&priv->sta_lock, flags);
}
EXPORT_SYMBOL(iwlcore_clear_stations_table);

void iwl_reset_qos(struct iwl_priv *priv)
{
	u16 cw_min = 15;
	u16 cw_max = 1023;
	u8 aifs = 2;
	u8 is_legacy = 0;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&priv->lock, flags);
	priv->qos_data.qos_active = 0;

	if (priv->iw_mode == IEEE80211_IF_TYPE_IBSS) {
		if (priv->qos_data.qos_enable)
			priv->qos_data.qos_active = 1;
		if (!(priv->active_rate & 0xfff0)) {
			cw_min = 31;
			is_legacy = 1;
		}
	} else if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
		if (priv->qos_data.qos_enable)
			priv->qos_data.qos_active = 1;
	} else if (!(priv->staging_rxon.flags & RXON_FLG_SHORT_SLOT_MSK)) {
		cw_min = 31;
		is_legacy = 1;
	}

	if (priv->qos_data.qos_active)
		aifs = 3;

	priv->qos_data.def_qos_parm.ac[0].cw_min = cpu_to_le16(cw_min);
	priv->qos_data.def_qos_parm.ac[0].cw_max = cpu_to_le16(cw_max);
	priv->qos_data.def_qos_parm.ac[0].aifsn = aifs;
	priv->qos_data.def_qos_parm.ac[0].edca_txop = 0;
	priv->qos_data.def_qos_parm.ac[0].reserved1 = 0;

	if (priv->qos_data.qos_active) {
		i = 1;
		priv->qos_data.def_qos_parm.ac[i].cw_min = cpu_to_le16(cw_min);
		priv->qos_data.def_qos_parm.ac[i].cw_max = cpu_to_le16(cw_max);
		priv->qos_data.def_qos_parm.ac[i].aifsn = 7;
		priv->qos_data.def_qos_parm.ac[i].edca_txop = 0;
		priv->qos_data.def_qos_parm.ac[i].reserved1 = 0;

		i = 2;
		priv->qos_data.def_qos_parm.ac[i].cw_min =
			cpu_to_le16((cw_min + 1) / 2 - 1);
		priv->qos_data.def_qos_parm.ac[i].cw_max =
			cpu_to_le16(cw_max);
		priv->qos_data.def_qos_parm.ac[i].aifsn = 2;
		if (is_legacy)
			priv->qos_data.def_qos_parm.ac[i].edca_txop =
				cpu_to_le16(6016);
		else
			priv->qos_data.def_qos_parm.ac[i].edca_txop =
				cpu_to_le16(3008);
		priv->qos_data.def_qos_parm.ac[i].reserved1 = 0;

		i = 3;
		priv->qos_data.def_qos_parm.ac[i].cw_min =
			cpu_to_le16((cw_min + 1) / 4 - 1);
		priv->qos_data.def_qos_parm.ac[i].cw_max =
			cpu_to_le16((cw_max + 1) / 2 - 1);
		priv->qos_data.def_qos_parm.ac[i].aifsn = 2;
		priv->qos_data.def_qos_parm.ac[i].reserved1 = 0;
		if (is_legacy)
			priv->qos_data.def_qos_parm.ac[i].edca_txop =
				cpu_to_le16(3264);
		else
			priv->qos_data.def_qos_parm.ac[i].edca_txop =
				cpu_to_le16(1504);
	} else {
		for (i = 1; i < 4; i++) {
			priv->qos_data.def_qos_parm.ac[i].cw_min =
				cpu_to_le16(cw_min);
			priv->qos_data.def_qos_parm.ac[i].cw_max =
				cpu_to_le16(cw_max);
			priv->qos_data.def_qos_parm.ac[i].aifsn = aifs;
			priv->qos_data.def_qos_parm.ac[i].edca_txop = 0;
			priv->qos_data.def_qos_parm.ac[i].reserved1 = 0;
		}
	}
	IWL_DEBUG_QOS("set QoS to default \n");

	spin_unlock_irqrestore(&priv->lock, flags);
}
EXPORT_SYMBOL(iwl_reset_qos);

#ifdef CONFIG_IWL4965_HT
static void iwlcore_init_ht_hw_capab(const struct iwl_priv *priv,
			      struct ieee80211_ht_info *ht_info,
			      enum ieee80211_band band)
{
	ht_info->cap = 0;
	memset(ht_info->supp_mcs_set, 0, 16);

	ht_info->ht_supported = 1;

	if (priv->hw_params.fat_channel & BIT(band)) {
		ht_info->cap |= (u16)IEEE80211_HT_CAP_SUP_WIDTH;
		ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_40;
		ht_info->supp_mcs_set[4] = 0x01;
	}
	ht_info->cap |= (u16)IEEE80211_HT_CAP_GRN_FLD;
	ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_20;
	ht_info->cap |= (u16)(IEEE80211_HT_CAP_MIMO_PS &
			     (IWL_MIMO_PS_NONE << 2));

	if (priv->cfg->mod_params->amsdu_size_8K)
		ht_info->cap |= (u16)IEEE80211_HT_CAP_MAX_AMSDU;

	ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
	ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;

	ht_info->supp_mcs_set[0] = 0xFF;
	if (priv->hw_params.tx_chains_num >= 2)
		ht_info->supp_mcs_set[1] = 0xFF;
	if (priv->hw_params.tx_chains_num >= 3)
		ht_info->supp_mcs_set[2] = 0xFF;
}
#else
static inline void iwlcore_init_ht_hw_capab(const struct iwl_priv *priv,
			      struct ieee80211_ht_info *ht_info,
			      enum ieee80211_band band)
{
}
#endif /* CONFIG_IWL4965_HT */

static void iwlcore_init_hw_rates(struct iwl_priv *priv,
			      struct ieee80211_rate *rates)
{
	int i;

	for (i = 0; i < IWL_RATE_COUNT; i++) {
		rates[i].bitrate = iwl4965_rates[i].ieee * 5;
		rates[i].hw_value = i; /* Rate scaling will work on indexes */
		rates[i].hw_value_short = i;
		rates[i].flags = 0;
		if ((i > IWL_LAST_OFDM_RATE) || (i < IWL_FIRST_OFDM_RATE)) {
			/*
			 * If CCK != 1M then set short preamble rate flag.
			 */
			rates[i].flags |=
				(iwl4965_rates[i].plcp == IWL_RATE_1M_PLCP) ?
					0 : IEEE80211_RATE_SHORT_PREAMBLE;
		}
	}
}

/**
 * iwlcore_init_geos - Initialize mac80211's geo/channel info based from eeprom
 */
static int iwlcore_init_geos(struct iwl_priv *priv)
{
	struct iwl_channel_info *ch;
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *channels;
	struct ieee80211_channel *geo_ch;
	struct ieee80211_rate *rates;
	int i = 0;

	if (priv->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
	    priv->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
		IWL_DEBUG_INFO("Geography modes already initialized.\n");
		set_bit(STATUS_GEO_CONFIGURED, &priv->status);
		return 0;
	}

	channels = kzalloc(sizeof(struct ieee80211_channel) *
			   priv->channel_count, GFP_KERNEL);
	if (!channels)
		return -ENOMEM;

	rates = kzalloc((sizeof(struct ieee80211_rate) * (IWL_RATE_COUNT + 1)),
			GFP_KERNEL);
	if (!rates) {
		kfree(channels);
		return -ENOMEM;
	}

	/* 5.2GHz channels start after the 2.4GHz channels */
	sband = &priv->bands[IEEE80211_BAND_5GHZ];
	sband->channels = &channels[ARRAY_SIZE(iwl_eeprom_band_1)];
	/* just OFDM */
	sband->bitrates = &rates[IWL_FIRST_OFDM_RATE];
	sband->n_bitrates = IWL_RATE_COUNT - IWL_FIRST_OFDM_RATE;

	iwlcore_init_ht_hw_capab(priv, &sband->ht_info, IEEE80211_BAND_5GHZ);

	sband = &priv->bands[IEEE80211_BAND_2GHZ];
	sband->channels = channels;
	/* OFDM & CCK */
	sband->bitrates = rates;
	sband->n_bitrates = IWL_RATE_COUNT;

	iwlcore_init_ht_hw_capab(priv, &sband->ht_info, IEEE80211_BAND_2GHZ);

	priv->ieee_channels = channels;
	priv->ieee_rates = rates;

	iwlcore_init_hw_rates(priv, rates);

	for (i = 0;  i < priv->channel_count; i++) {
		ch = &priv->channel_info[i];

		/* FIXME: might be removed if scan is OK */
		if (!is_channel_valid(ch))
			continue;

		if (is_channel_a_band(ch))
			sband =  &priv->bands[IEEE80211_BAND_5GHZ];
		else
			sband =  &priv->bands[IEEE80211_BAND_2GHZ];

		geo_ch = &sband->channels[sband->n_channels++];

		geo_ch->center_freq =
				ieee80211_channel_to_frequency(ch->channel);
		geo_ch->max_power = ch->max_power_avg;
		geo_ch->max_antenna_gain = 0xff;
		geo_ch->hw_value = ch->channel;

		if (is_channel_valid(ch)) {
			if (!(ch->flags & EEPROM_CHANNEL_IBSS))
				geo_ch->flags |= IEEE80211_CHAN_NO_IBSS;

			if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
				geo_ch->flags |= IEEE80211_CHAN_PASSIVE_SCAN;

			if (ch->flags & EEPROM_CHANNEL_RADAR)
				geo_ch->flags |= IEEE80211_CHAN_RADAR;

			if (ch->max_power_avg > priv->max_channel_txpower_limit)
				priv->max_channel_txpower_limit =
				    ch->max_power_avg;
		} else {
			geo_ch->flags |= IEEE80211_CHAN_DISABLED;
		}

		/* Save flags for reg domain usage */
		geo_ch->orig_flags = geo_ch->flags;

		IWL_DEBUG_INFO("Channel %d Freq=%d[%sGHz] %s flag=0%X\n",
				ch->channel, geo_ch->center_freq,
				is_channel_a_band(ch) ?  "5.2" : "2.4",
				geo_ch->flags & IEEE80211_CHAN_DISABLED ?
				"restricted" : "valid",
				 geo_ch->flags);
	}

	if ((priv->bands[IEEE80211_BAND_5GHZ].n_channels == 0) &&
	     priv->cfg->sku & IWL_SKU_A) {
		printk(KERN_INFO DRV_NAME
		       ": Incorrectly detected BG card as ABG.  Please send "
		       "your PCI ID 0x%04X:0x%04X to maintainer.\n",
		       priv->pci_dev->device, priv->pci_dev->subsystem_device);
		priv->cfg->sku &= ~IWL_SKU_A;
	}

	printk(KERN_INFO DRV_NAME
	       ": Tunable channels: %d 802.11bg, %d 802.11a channels\n",
	       priv->bands[IEEE80211_BAND_2GHZ].n_channels,
	       priv->bands[IEEE80211_BAND_5GHZ].n_channels);

	if (priv->bands[IEEE80211_BAND_2GHZ].n_channels)
		priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
			&priv->bands[IEEE80211_BAND_2GHZ];
	if (priv->bands[IEEE80211_BAND_5GHZ].n_channels)
		priv->hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
			&priv->bands[IEEE80211_BAND_5GHZ];

	set_bit(STATUS_GEO_CONFIGURED, &priv->status);

	return 0;
}

/*
 * iwlcore_free_geos - undo allocations in iwlcore_init_geos
 */
void iwlcore_free_geos(struct iwl_priv *priv)
{
	kfree(priv->ieee_channels);
	kfree(priv->ieee_rates);
	clear_bit(STATUS_GEO_CONFIGURED, &priv->status);
}
EXPORT_SYMBOL(iwlcore_free_geos);

#ifdef CONFIG_IWL4965_HT
static u8 is_single_rx_stream(struct iwl_priv *priv)
{
	return !priv->current_ht_config.is_ht ||
	       ((priv->current_ht_config.supp_mcs_set[1] == 0) &&
		(priv->current_ht_config.supp_mcs_set[2] == 0)) ||
	       priv->ps_mode == IWL_MIMO_PS_STATIC;
}
static u8 iwl_is_channel_extension(struct iwl_priv *priv,
				   enum ieee80211_band band,
				   u16 channel, u8 extension_chan_offset)
{
	const struct iwl_channel_info *ch_info;

	ch_info = iwl_get_channel_info(priv, band, channel);
	if (!is_channel_valid(ch_info))
		return 0;

	if (extension_chan_offset == IWL_EXT_CHANNEL_OFFSET_NONE)
		return 0;

	if ((ch_info->fat_extension_channel == extension_chan_offset) ||
	    (ch_info->fat_extension_channel == HT_IE_EXT_CHANNEL_MAX))
		return 1;

	return 0;
}

u8 iwl_is_fat_tx_allowed(struct iwl_priv *priv,
			     struct ieee80211_ht_info *sta_ht_inf)
{
	struct iwl_ht_info *iwl_ht_conf = &priv->current_ht_config;

	if ((!iwl_ht_conf->is_ht) ||
	   (iwl_ht_conf->supported_chan_width != IWL_CHANNEL_WIDTH_40MHZ) ||
	   (iwl_ht_conf->extension_chan_offset == IWL_EXT_CHANNEL_OFFSET_NONE))
		return 0;

	if (sta_ht_inf) {
		if ((!sta_ht_inf->ht_supported) ||
		   (!(sta_ht_inf->cap & IEEE80211_HT_CAP_SUP_WIDTH)))
			return 0;
	}

	return iwl_is_channel_extension(priv, priv->band,
					 iwl_ht_conf->control_channel,
					 iwl_ht_conf->extension_chan_offset);
}
EXPORT_SYMBOL(iwl_is_fat_tx_allowed);

void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_info *ht_info)
{
	struct iwl4965_rxon_cmd *rxon = &priv->staging_rxon;
	u32 val;

	if (!ht_info->is_ht)
		return;

	/* Set up channel bandwidth:  20 MHz only, or 20/40 mixed if fat ok */
	if (iwl_is_fat_tx_allowed(priv, NULL))
		rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED_MSK;
	else
		rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED_MSK |
				 RXON_FLG_CHANNEL_MODE_PURE_40_MSK);

	if (le16_to_cpu(rxon->channel) != ht_info->control_channel) {
		IWL_DEBUG_ASSOC("control diff than current %d %d\n",
				le16_to_cpu(rxon->channel),
				ht_info->control_channel);
		rxon->channel = cpu_to_le16(ht_info->control_channel);
		return;
	}

	/* Note: control channel is opposite of extension channel */
	switch (ht_info->extension_chan_offset) {
	case IWL_EXT_CHANNEL_OFFSET_ABOVE:
		rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
		break;
	case IWL_EXT_CHANNEL_OFFSET_BELOW:
		rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
		break;
	case IWL_EXT_CHANNEL_OFFSET_NONE:
	default:
		rxon->flags &= ~RXON_FLG_CHANNEL_MODE_MIXED_MSK;
		break;
	}

	val = ht_info->ht_protection;

	rxon->flags |= cpu_to_le32(val << RXON_FLG_HT_OPERATING_MODE_POS);

	iwl_set_rxon_chain(priv);

	IWL_DEBUG_ASSOC("supported HT rate 0x%X 0x%X 0x%X "
			"rxon flags 0x%X operation mode :0x%X "
			"extension channel offset 0x%x "
			"control chan %d\n",
			ht_info->supp_mcs_set[0],
			ht_info->supp_mcs_set[1],
			ht_info->supp_mcs_set[2],
			le32_to_cpu(rxon->flags), ht_info->ht_protection,
			ht_info->extension_chan_offset,
			ht_info->control_channel);
	return;
}
EXPORT_SYMBOL(iwl_set_rxon_ht);

#else
static inline u8 is_single_rx_stream(struct iwl_priv *priv)
{
	return 1;
}
#endif	/*CONFIG_IWL4965_HT */

/*
 * Determine how many receiver/antenna chains to use.
 * More provides better reception via diversity.  Fewer saves power.
 * MIMO (dual stream) requires at least 2, but works better with 3.
 * This does not determine *which* chains to use, just how many.
 */
static int iwlcore_get_rx_chain_counter(struct iwl_priv *priv,
					u8 *idle_state, u8 *rx_state)
{
	u8 is_single = is_single_rx_stream(priv);
	u8 is_cam = test_bit(STATUS_POWER_PMI, &priv->status) ? 0 : 1;

	/* # of Rx chains to use when expecting MIMO. */
	if (is_single || (!is_cam && (priv->ps_mode == IWL_MIMO_PS_STATIC)))
		*rx_state = 2;
	else
		*rx_state = 3;

	/* # Rx chains when idling and maybe trying to save power */
	switch (priv->ps_mode) {
	case IWL_MIMO_PS_STATIC:
	case IWL_MIMO_PS_DYNAMIC:
		*idle_state = (is_cam) ? 2 : 1;
		break;
	case IWL_MIMO_PS_NONE:
		*idle_state = (is_cam) ? *rx_state : 1;
		break;
	default:
		*idle_state = 1;
		break;
	}

	return 0;
}

/**
 * iwl_set_rxon_chain - Set up Rx chain usage in "staging" RXON image
 *
 * Selects how many and which Rx receivers/antennas/chains to use.
 * This should not be used for scan command ... it puts data in wrong place.
 */
void iwl_set_rxon_chain(struct iwl_priv *priv)
{
	u8 is_single = is_single_rx_stream(priv);
	u8 idle_state, rx_state;

	priv->staging_rxon.rx_chain = 0;
	rx_state = idle_state = 3;

	/* Tell uCode which antennas are actually connected.
	 * Before first association, we assume all antennas are connected.
	 * Just after first association, iwl_chain_noise_calibration()
	 *    checks which antennas actually *are* connected. */
	priv->staging_rxon.rx_chain |=
		    cpu_to_le16(priv->hw_params.valid_rx_ant <<
						 RXON_RX_CHAIN_VALID_POS);

	/* How many receivers should we use? */
	iwlcore_get_rx_chain_counter(priv, &idle_state, &rx_state);
	priv->staging_rxon.rx_chain |=
		cpu_to_le16(rx_state << RXON_RX_CHAIN_MIMO_CNT_POS);
	priv->staging_rxon.rx_chain |=
		cpu_to_le16(idle_state << RXON_RX_CHAIN_CNT_POS);

	if (!is_single && (rx_state >= 2) &&
	    !test_bit(STATUS_POWER_PMI, &priv->status))
		priv->staging_rxon.rx_chain |= RXON_RX_CHAIN_MIMO_FORCE_MSK;
	else
		priv->staging_rxon.rx_chain &= ~RXON_RX_CHAIN_MIMO_FORCE_MSK;

	IWL_DEBUG_ASSOC("rx chain %X\n", priv->staging_rxon.rx_chain);
}
EXPORT_SYMBOL(iwl_set_rxon_chain);

/**
 * iwlcore_set_rxon_channel - Set the phymode and channel values in staging RXON
 * @phymode: MODE_IEEE80211A sets to 5.2GHz; all else set to 2.4GHz
 * @channel: Any channel valid for the requested phymode

 * In addition to setting the staging RXON, priv->phymode is also set.
 *
 * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 * in the staging RXON flag structure based on the phymode
 */
int iwl_set_rxon_channel(struct iwl_priv *priv,
				enum ieee80211_band band,
				u16 channel)
{
	if (!iwl_get_channel_info(priv, band, channel)) {
		IWL_DEBUG_INFO("Could not set channel to %d [%d]\n",
			       channel, band);
		return -EINVAL;
	}

	if ((le16_to_cpu(priv->staging_rxon.channel) == channel) &&
	    (priv->band == band))
		return 0;

	priv->staging_rxon.channel = cpu_to_le16(channel);
	if (band == IEEE80211_BAND_5GHZ)
		priv->staging_rxon.flags &= ~RXON_FLG_BAND_24G_MSK;
	else
		priv->staging_rxon.flags |= RXON_FLG_BAND_24G_MSK;

	priv->band = band;

	IWL_DEBUG_INFO("Staging channel set to %d [%d]\n", channel, band);

	return 0;
}
EXPORT_SYMBOL(iwl_set_rxon_channel);

static void iwlcore_init_hw(struct iwl_priv *priv)
{
	struct ieee80211_hw *hw = priv->hw;
	hw->rate_control_algorithm = "iwl-4965-rs";

	/* Tell mac80211 and its clients (e.g. Wireless Extensions)
	 *	 the range of signal quality values that we'll provide.
	 * Negative values for level/noise indicate that we'll provide dBm.
	 * For WE, at least, non-0 values here *enable* display of values
	 *	 in app (iwconfig). */
	hw->max_rssi = -20; /* signal level, negative indicates dBm */
	hw->max_noise = -20;	/* noise level, negative indicates dBm */
	hw->max_signal = 100;	/* link quality indication (%) */

	/* Tell mac80211 our Tx characteristics */
	hw->flags = IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE;

	/* Default value; 4 EDCA QOS priorities */
	hw->queues = 4;
#ifdef CONFIG_IWL4965_HT
	/* Enhanced value; more queues, to support 11n aggregation */
	hw->ampdu_queues = 12;
#endif /* CONFIG_IWL4965_HT */
}

static int iwlcore_init_drv(struct iwl_priv *priv)
{
	int ret;
	int i;

	priv->retry_rate = 1;
	priv->ibss_beacon = NULL;

	spin_lock_init(&priv->lock);
	spin_lock_init(&priv->power_data.lock);
	spin_lock_init(&priv->sta_lock);
	spin_lock_init(&priv->hcmd_lock);
	spin_lock_init(&priv->lq_mngr.lock);

	for (i = 0; i < IWL_IBSS_MAC_HASH_SIZE; i++)
		INIT_LIST_HEAD(&priv->ibss_mac_hash[i]);

	INIT_LIST_HEAD(&priv->free_frames);

	mutex_init(&priv->mutex);

	/* Clear the driver's (not device's) station table */
	iwlcore_clear_stations_table(priv);

	priv->data_retry_limit = -1;
	priv->ieee_channels = NULL;
	priv->ieee_rates = NULL;
	priv->band = IEEE80211_BAND_2GHZ;

	priv->iw_mode = IEEE80211_IF_TYPE_STA;

	priv->use_ant_b_for_management_frame = 1; /* start with ant B */
	priv->ps_mode = IWL_MIMO_PS_NONE;

	/* Choose which receivers/antennas to use */
	iwl_set_rxon_chain(priv);

	iwl_reset_qos(priv);

	priv->qos_data.qos_active = 0;
	priv->qos_data.qos_cap.val = 0;

	iwl_set_rxon_channel(priv, IEEE80211_BAND_2GHZ, 6);

	priv->rates_mask = IWL_RATES_MASK;
	/* If power management is turned on, default to AC mode */
	priv->power_mode = IWL_POWER_AC;
	priv->user_txpower_limit = IWL_DEFAULT_TX_POWER;

	ret = iwl_init_channel_map(priv);
	if (ret) {
		IWL_ERROR("initializing regulatory failed: %d\n", ret);
		goto err;
	}

	ret = iwlcore_init_geos(priv);
	if (ret) {
		IWL_ERROR("initializing geos failed: %d\n", ret);
		goto err_free_channel_map;
	}

	ret = ieee80211_register_hw(priv->hw);
	if (ret) {
		IWL_ERROR("Failed to register network device (error %d)\n",
				ret);
		goto err_free_geos;
	}

	priv->hw->conf.beacon_int = 100;
	priv->mac80211_registered = 1;

	return 0;

err_free_geos:
	iwlcore_free_geos(priv);
err_free_channel_map:
	iwl_free_channel_map(priv);
err:
	return ret;
}

int iwl_setup(struct iwl_priv *priv)
{
	int ret = 0;
	iwlcore_init_hw(priv);
	ret = iwlcore_init_drv(priv);
	return ret;
}
EXPORT_SYMBOL(iwl_setup);

/* Low level driver call this function to update iwlcore with
 * driver status.
 */
int iwlcore_low_level_notify(struct iwl_priv *priv,
			      enum iwlcore_card_notify notify)
{
	int ret;
	switch (notify) {
	case IWLCORE_INIT_EVT:
		ret = iwl_rfkill_init(priv);
		if (ret)
			IWL_ERROR("Unable to initialize RFKILL system. "
				  "Ignoring error: %d\n", ret);
		iwl_power_initialize(priv);
		break;
	case IWLCORE_START_EVT:
		iwl_power_update_mode(priv, 1);
		break;
	case IWLCORE_STOP_EVT:
		break;
	case IWLCORE_REMOVE_EVT:
		iwl_rfkill_unregister(priv);
		break;
	}

	return 0;
}
EXPORT_SYMBOL(iwlcore_low_level_notify);

int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags)
{
	u32 stat_flags = 0;
	struct iwl_host_cmd cmd = {
		.id = REPLY_STATISTICS_CMD,
		.meta.flags = flags,
		.len = sizeof(stat_flags),
		.data = (u8 *) &stat_flags,
	};
	return iwl_send_cmd(priv, &cmd);
}
EXPORT_SYMBOL(iwl_send_statistics_request);

/**
 * iwl_verify_inst_sparse - verify runtime uCode image in card vs. host,
 *   using sample data 100 bytes apart.  If these sample points are good,
 *   it's a pretty good bet that everything between them is good, too.
 */
static int iwlcore_verify_inst_sparse(struct iwl_priv *priv, __le32 *image, u32 len)
{
	u32 val;
	int ret = 0;
	u32 errcnt = 0;
	u32 i;

	IWL_DEBUG_INFO("ucode inst image size is %u\n", len);

	ret = iwl_grab_nic_access(priv);
	if (ret)
		return ret;

	for (i = 0; i < len; i += 100, image += 100/sizeof(u32)) {
		/* read data comes through single port, auto-incr addr */
		/* NOTE: Use the debugless read so we don't flood kernel log
		 * if IWL_DL_IO is set */
		iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR,
			i + RTC_INST_LOWER_BOUND);
		val = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
		if (val != le32_to_cpu(*image)) {
			ret = -EIO;
			errcnt++;
			if (errcnt >= 3)
				break;
		}
	}

	iwl_release_nic_access(priv);

	return ret;
}

/**
 * iwlcore_verify_inst_full - verify runtime uCode image in card vs. host,
 *     looking at all data.
 */
static int iwl_verify_inst_full(struct iwl_priv *priv, __le32 *image,
				 u32 len)
{
	u32 val;
	u32 save_len = len;
	int ret = 0;
	u32 errcnt;

	IWL_DEBUG_INFO("ucode inst image size is %u\n", len);

	ret = iwl_grab_nic_access(priv);
	if (ret)
		return ret;

	iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, RTC_INST_LOWER_BOUND);

	errcnt = 0;
	for (; len > 0; len -= sizeof(u32), image++) {
		/* read data comes through single port, auto-incr addr */
		/* NOTE: Use the debugless read so we don't flood kernel log
		 * if IWL_DL_IO is set */
		val = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
		if (val != le32_to_cpu(*image)) {
			IWL_ERROR("uCode INST section is invalid at "
				  "offset 0x%x, is 0x%x, s/b 0x%x\n",
				  save_len - len, val, le32_to_cpu(*image));
			ret = -EIO;
			errcnt++;
			if (errcnt >= 20)
				break;
		}
	}

	iwl_release_nic_access(priv);

	if (!errcnt)
		IWL_DEBUG_INFO
		    ("ucode image in INSTRUCTION memory is good\n");

	return ret;
}

/**
 * iwl_verify_ucode - determine which instruction image is in SRAM,
 *    and verify its contents
 */
int iwl_verify_ucode(struct iwl_priv *priv)
{
	__le32 *image;
	u32 len;
	int ret;

	/* Try bootstrap */
	image = (__le32 *)priv->ucode_boot.v_addr;
	len = priv->ucode_boot.len;
	ret = iwlcore_verify_inst_sparse(priv, image, len);
	if (!ret) {
		IWL_DEBUG_INFO("Bootstrap uCode is good in inst SRAM\n");
		return 0;
	}

	/* Try initialize */
	image = (__le32 *)priv->ucode_init.v_addr;
	len = priv->ucode_init.len;
	ret = iwlcore_verify_inst_sparse(priv, image, len);
	if (!ret) {
		IWL_DEBUG_INFO("Initialize uCode is good in inst SRAM\n");
		return 0;
	}

	/* Try runtime/protocol */
	image = (__le32 *)priv->ucode_code.v_addr;
	len = priv->ucode_code.len;
	ret = iwlcore_verify_inst_sparse(priv, image, len);
	if (!ret) {
		IWL_DEBUG_INFO("Runtime uCode is good in inst SRAM\n");
		return 0;
	}

	IWL_ERROR("NO VALID UCODE IMAGE IN INSTRUCTION SRAM!!\n");

	/* Since nothing seems to match, show first several data entries in
	 * instruction SRAM, so maybe visual inspection will give a clue.
	 * Selection of bootstrap image (vs. other images) is arbitrary. */
	image = (__le32 *)priv->ucode_boot.v_addr;
	len = priv->ucode_boot.len;
	ret = iwl_verify_inst_full(priv, image, len);

	return ret;
}
EXPORT_SYMBOL(iwl_verify_ucode);