drivers/net/wireless/iwlwifi/iwl-agn-eeprom.c - LeafOS-Devices/android_kernel_realme_mt6785 - Gitiles

 /******************************************************************************
  *
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
  *
  * GPL LICENSE SUMMARY
  *
  * Copyright(c) 2008 - 2010 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:
  *  Intel Linux Wireless <ilw@linux.intel.com>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  * BSD LICENSE
  *
  * Copyright(c) 2005 - 2010 Intel Corporation. All rights reserved.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *  * Neither the name Intel Corporation nor the names of its
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/


 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/init.h>

 #include <net/mac80211.h>

 #include "iwl-commands.h"
 #include "iwl-dev.h"
 #include "iwl-core.h"
 #include "iwl-debug.h"
 #include "iwl-agn.h"
 #include "iwl-io.h"

 /************************** EEPROM BANDS ****************************
  *
  * The iwl_eeprom_band definitions below provide the mapping from the
  * EEPROM contents to the specific channel number supported for each
  * band.
  *
  * For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
  * The specific geography and calibration information for that channel
  * is contained in the eeprom map itself.
  *
  * During init, we copy the eeprom information and channel map
  * information into priv->channel_info_24/52 and priv->channel_map_24/52
  *
  * channel_map_24/52 provides the index in the channel_info array for a
  * given channel.  We have to have two separate maps as there is channel
  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
  * band_2
  *
  * A value of 0xff stored in the channel_map indicates that the channel
  * is not supported by the hardware at all.
  *
  * A value of 0xfe in the channel_map indicates that the channel is not
  * valid for Tx with the current hardware.  This means that
  * while the system can tune and receive on a given channel, it may not
  * be able to associate or transmit any frames on that
  * channel.  There is no corresponding channel information for that
  * entry.
  *
  *********************************************************************/

 /**
  * struct iwl_txpwr_section: eeprom section information
  * @offset: indirect address into eeprom image
  * @count: number of "struct iwl_eeprom_enhanced_txpwr" in this section
  * @band: band type for the section
  * @is_common - true: common section, false: channel section
  * @is_cck - true: cck section, false: not cck section
  * @is_ht_40 - true: all channel in the section are HT40 channel,
  *	       false: legacy or HT 20 MHz
  *	       ignore if it is common section
  * @iwl_eeprom_section_channel: channel array in the section,
  *	       ignore if common section
  */
 struct iwl_txpwr_section {
 	u32 offset;
 	u8 count;
 	enum ieee80211_band band;
 	bool is_common;
 	bool is_cck;
 	bool is_ht40;
 	u8 iwl_eeprom_section_channel[EEPROM_MAX_TXPOWER_SECTION_ELEMENTS];
 };

 /**
  * section 1 - 3 are regulatory tx power apply to all channels based on
  *    modulation: CCK, OFDM
  *    Band: 2.4GHz, 5.2GHz
  * section 4 - 10 are regulatory tx power apply to specified channels
  *    For example:
  *	1L - Channel 1 Legacy
  *	1HT - Channel 1 HT
  *	(1,+1) - Channel 1 HT40 "_above_"
  *
  * Section 1: all CCK channels
  * Section 2: all 2.4 GHz OFDM (Legacy, HT and HT40) channels
  * Section 3: all 5.2 GHz OFDM (Legacy, HT and HT40) channels
  * Section 4: 2.4 GHz 20MHz channels: 1L, 1HT, 2L, 2HT, 10L, 10HT, 11L, 11HT
  * Section 5: 2.4 GHz 40MHz channels: (1,+1) (2,+1) (6,+1) (7,+1) (9,+1)
  * Section 6: 5.2 GHz 20MHz channels: 36L, 64L, 100L, 36HT, 64HT, 100HT
  * Section 7: 5.2 GHz 40MHz channels: (36,+1) (60,+1) (100,+1)
  * Section 8: 2.4 GHz channel: 13L, 13HT
  * Section 9: 2.4 GHz channel: 140L, 140HT
  * Section 10: 2.4 GHz 40MHz channels: (132,+1)  (44,+1)
  *
  */
 static const struct iwl_txpwr_section enhinfo[] = {
 	{ EEPROM_LB_CCK_20_COMMON, 1, IEEE80211_BAND_2GHZ, true, true, false },
 	{ EEPROM_LB_OFDM_COMMON, 3, IEEE80211_BAND_2GHZ, true, false, false },
 	{ EEPROM_HB_OFDM_COMMON, 3, IEEE80211_BAND_5GHZ, true, false, false },
 	{ EEPROM_LB_OFDM_20_BAND, 8, IEEE80211_BAND_2GHZ,
 		false, false, false,
 		{1, 1, 2, 2, 10, 10, 11, 11 } },
 	{ EEPROM_LB_OFDM_HT40_BAND, 5, IEEE80211_BAND_2GHZ,
 		false, false, true,
 		{ 1, 2, 6, 7, 9 } },
 	{ EEPROM_HB_OFDM_20_BAND, 6, IEEE80211_BAND_5GHZ,
 		false, false, false,
 		{ 36, 64, 100, 36, 64, 100 } },
 	{ EEPROM_HB_OFDM_HT40_BAND, 3, IEEE80211_BAND_5GHZ,
 		false, false, true,
 		{ 36, 60, 100 } },
 	{ EEPROM_LB_OFDM_20_CHANNEL_13, 2, IEEE80211_BAND_2GHZ,
 		false, false, false,
 		{ 13, 13 } },
 	{ EEPROM_HB_OFDM_20_CHANNEL_140, 2, IEEE80211_BAND_5GHZ,
 		false, false, false,
 		{ 140, 140 } },
 	{ EEPROM_HB_OFDM_HT40_BAND_1, 2, IEEE80211_BAND_5GHZ,
 		false, false, true,
 		{ 132, 44 } },
 };

 /******************************************************************************
  *
  * EEPROM related functions
  *
 ******************************************************************************/

 /*
  * The device's EEPROM semaphore prevents conflicts between driver and uCode
  * when accessing the EEPROM; each access is a series of pulses to/from the
  * EEPROM chip, not a single event, so even reads could conflict if they
  * weren't arbitrated by the semaphore.
  */
 int iwlcore_eeprom_acquire_semaphore(struct iwl_priv *priv)
 {
 	u16 count;
 	int ret;

 	for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
 		/* Request semaphore */
 		iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
 			    CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

 		/* See if we got it */
 		ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
 				CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 				CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 				EEPROM_SEM_TIMEOUT);
 		if (ret >= 0) {
 			IWL_DEBUG_IO(priv,
 				"Acquired semaphore after %d tries.\n",
 				count+1);
 			return ret;
 		}
 	}

 	return ret;
 }

 void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
 {
 	iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
 		CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

 }

 int iwl_eeprom_check_version(struct iwl_priv *priv)
 {
 	u16 eeprom_ver;
 	u16 calib_ver;

 	eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
 	calib_ver = priv->cfg->ops->lib->eeprom_ops.calib_version(priv);

 	if (eeprom_ver < priv->cfg->eeprom_ver ||
 	    calib_ver < priv->cfg->eeprom_calib_ver)
 		goto err;

 	IWL_INFO(priv, "device EEPROM VER=0x%x, CALIB=0x%x\n",
 		 eeprom_ver, calib_ver);

 	return 0;
 err:
 	IWL_ERR(priv, "Unsupported (too old) EEPROM VER=0x%x < 0x%x "
 		  "CALIB=0x%x < 0x%x\n",
 		  eeprom_ver, priv->cfg->eeprom_ver,
 		  calib_ver,  priv->cfg->eeprom_calib_ver);
 	return -EINVAL;

 }

 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
 {
 	const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
 					EEPROM_MAC_ADDRESS);
 	memcpy(mac, addr, ETH_ALEN);
 }

 /**
  * iwl_get_max_txpower_avg - get the highest tx power from all chains.
  *     find the highest tx power from all chains for the channel
  */
 static s8 iwl_get_max_txpower_avg(struct iwl_priv *priv,
 		struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 		int element, s8 *max_txpower_in_half_dbm)
 {
 	s8 max_txpower_avg = 0; /* (dBm) */

 	IWL_DEBUG_INFO(priv, "%d - "
 			"chain_a: %d dB chain_b: %d dB "
 			"chain_c: %d dB mimo2: %d dB mimo3: %d dB\n",
 			element,
 			enhanced_txpower[element].chain_a_max >> 1,
 			enhanced_txpower[element].chain_b_max >> 1,
 			enhanced_txpower[element].chain_c_max >> 1,
 			enhanced_txpower[element].mimo2_max >> 1,
 			enhanced_txpower[element].mimo3_max >> 1);
 	/* Take the highest tx power from any valid chains */
 	if ((priv->cfg->valid_tx_ant & ANT_A) &&
 	    (enhanced_txpower[element].chain_a_max > max_txpower_avg))
 		max_txpower_avg = enhanced_txpower[element].chain_a_max;
 	if ((priv->cfg->valid_tx_ant & ANT_B) &&
 	    (enhanced_txpower[element].chain_b_max > max_txpower_avg))
 		max_txpower_avg = enhanced_txpower[element].chain_b_max;
 	if ((priv->cfg->valid_tx_ant & ANT_C) &&
 	    (enhanced_txpower[element].chain_c_max > max_txpower_avg))
 		max_txpower_avg = enhanced_txpower[element].chain_c_max;
 	if (((priv->cfg->valid_tx_ant == ANT_AB) |
 	    (priv->cfg->valid_tx_ant == ANT_BC) |
 	    (priv->cfg->valid_tx_ant == ANT_AC)) &&
 	    (enhanced_txpower[element].mimo2_max > max_txpower_avg))
 		max_txpower_avg =  enhanced_txpower[element].mimo2_max;
 	if ((priv->cfg->valid_tx_ant == ANT_ABC) &&
 	    (enhanced_txpower[element].mimo3_max > max_txpower_avg))
 		max_txpower_avg = enhanced_txpower[element].mimo3_max;

 	/*
 	 * max. tx power in EEPROM is in 1/2 dBm format
 	 * convert from 1/2 dBm to dBm (round-up convert)
 	 * but we also do not want to loss 1/2 dBm resolution which
 	 * will impact performance
 	 */
 	*max_txpower_in_half_dbm = max_txpower_avg;
 	return (max_txpower_avg & 0x01) + (max_txpower_avg >> 1);
 }

 /**
  * iwl_update_common_txpower: update channel tx power
  *     update tx power per band based on EEPROM enhanced tx power info.
  */
 static s8 iwl_update_common_txpower(struct iwl_priv *priv,
 		struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 		int section, int element, s8 *max_txpower_in_half_dbm)
 {
 	struct iwl_channel_info *ch_info;
 	int ch;
 	bool is_ht40 = false;
 	s8 max_txpower_avg; /* (dBm) */

 	/* it is common section, contain all type (Legacy, HT and HT40)
 	 * based on the element in the section to determine
 	 * is it HT 40 or not
 	 */
 	if (element == EEPROM_TXPOWER_COMMON_HT40_INDEX)
 		is_ht40 = true;
 	max_txpower_avg =
 		iwl_get_max_txpower_avg(priv, enhanced_txpower,
 					element, max_txpower_in_half_dbm);

 	ch_info = priv->channel_info;

 	for (ch = 0; ch < priv->channel_count; ch++) {
 		/* find matching band and update tx power if needed */
 		if ((ch_info->band == enhinfo[section].band) &&
 		    (ch_info->max_power_avg < max_txpower_avg) &&
 		    (!is_ht40)) {
 			/* Update regulatory-based run-time data */
 			ch_info->max_power_avg = ch_info->curr_txpow =
 				max_txpower_avg;
 			ch_info->scan_power = max_txpower_avg;
 		}
 		if ((ch_info->band == enhinfo[section].band) && is_ht40 &&
 		    (ch_info->ht40_max_power_avg < max_txpower_avg)) {
 			/* Update regulatory-based run-time data */
 			ch_info->ht40_max_power_avg = max_txpower_avg;
 		}
 		ch_info++;
 	}
 	return max_txpower_avg;
 }

 /**
  * iwl_update_channel_txpower: update channel tx power
  *      update channel tx power based on EEPROM enhanced tx power info.
  */
 static s8 iwl_update_channel_txpower(struct iwl_priv *priv,
 		struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 		int section, int element, s8 *max_txpower_in_half_dbm)
 {
 	struct iwl_channel_info *ch_info;
 	int ch;
 	u8 channel;
 	s8 max_txpower_avg; /* (dBm) */

 	channel = enhinfo[section].iwl_eeprom_section_channel[element];
 	max_txpower_avg =
 		iwl_get_max_txpower_avg(priv, enhanced_txpower,
 					element, max_txpower_in_half_dbm);

 	ch_info = priv->channel_info;
 	for (ch = 0; ch < priv->channel_count; ch++) {
 		/* find matching channel and update tx power if needed */
 		if (ch_info->channel == channel) {
 			if ((ch_info->max_power_avg < max_txpower_avg) &&
 			    (!enhinfo[section].is_ht40)) {
 				/* Update regulatory-based run-time data */
 				ch_info->max_power_avg = max_txpower_avg;
 				ch_info->curr_txpow = max_txpower_avg;
 				ch_info->scan_power = max_txpower_avg;
 			}
 			if ((enhinfo[section].is_ht40) &&
 			    (ch_info->ht40_max_power_avg < max_txpower_avg)) {
 				/* Update regulatory-based run-time data */
 				ch_info->ht40_max_power_avg = max_txpower_avg;
 			}
 			break;
 		}
 		ch_info++;
 	}
 	return max_txpower_avg;
 }

 /**
  * iwlcore_eeprom_enhanced_txpower: process enhanced tx power info
  */
 void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
 {
 	int eeprom_section_count = 0;
 	int section, element;
 	struct iwl_eeprom_enhanced_txpwr *enhanced_txpower;
 	u32 offset;
 	s8 max_txpower_avg; /* (dBm) */
 	s8 max_txpower_in_half_dbm; /* (half-dBm) */

 	/* Loop through all the sections
 	 * adjust bands and channel's max tx power
 	 * Set the tx_power_user_lmt to the highest power
 	 * supported by any channels and chains
 	 */
 	for (section = 0; section < ARRAY_SIZE(enhinfo); section++) {
 		eeprom_section_count = enhinfo[section].count;
 		offset = enhinfo[section].offset;
 		enhanced_txpower = (struct iwl_eeprom_enhanced_txpwr *)
 				iwl_eeprom_query_addr(priv, offset);

 		/*
 		 * check for valid entry -
 		 * different version of EEPROM might contain different set
 		 * of enhanced tx power table
 		 * always check for valid entry before process
 		 * the information
 		 */
 		if (!enhanced_txpower->common || enhanced_txpower->reserved)
 			continue;

 		for (element = 0; element < eeprom_section_count; element++) {
 			if (enhinfo[section].is_common)
 				max_txpower_avg =
 					iwl_update_common_txpower(priv,
 						enhanced_txpower, section,
 						element,
 						&max_txpower_in_half_dbm);
 			else
 				max_txpower_avg =
 					iwl_update_channel_txpower(priv,
 						enhanced_txpower, section,
 						element,
 						&max_txpower_in_half_dbm);

 			/* Update the tx_power_user_lmt to the highest power
 			 * supported by any channel */
 			if (max_txpower_avg > priv->tx_power_user_lmt)
 				priv->tx_power_user_lmt = max_txpower_avg;

 			/*
 			 * Update the tx_power_lmt_in_half_dbm to
 			 * the highest power supported by any channel
 			 */
 			if (max_txpower_in_half_dbm >
 			    priv->tx_power_lmt_in_half_dbm)
 				priv->tx_power_lmt_in_half_dbm =
 					max_txpower_in_half_dbm;
 		}
 	}
 }
	/******************************************************************************
	*
	* This file is provided under a dual BSD/GPLv2 license. When using or
	* redistributing this file, you may do so under either license.
	*
	* GPL LICENSE SUMMARY
	*
	* Copyright(c) 2008 - 2010 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:
	* Intel Linux Wireless <ilw@linux.intel.com>
	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	*
	* BSD LICENSE
	*
	* Copyright(c) 2005 - 2010 Intel Corporation. All rights reserved.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name Intel Corporation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*****************************************************************************/


	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/init.h>

	#include <net/mac80211.h>

	#include "iwl-commands.h"
	#include "iwl-dev.h"
	#include "iwl-core.h"
	#include "iwl-debug.h"
	#include "iwl-agn.h"
	#include "iwl-io.h"

	/************************ EEPROM BANDS **************************
	*
	* The iwl_eeprom_band definitions below provide the mapping from the
	* EEPROM contents to the specific channel number supported for each
	* band.
	*
	* For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
	* definition below maps to physical channel 42 in the 5.2GHz spectrum.
	* The specific geography and calibration information for that channel
	* is contained in the eeprom map itself.
	*
	* During init, we copy the eeprom information and channel map
	* information into priv->channel_info_24/52 and priv->channel_map_24/52
	*
	* channel_map_24/52 provides the index in the channel_info array for a
	* given channel. We have to have two separate maps as there is channel
	* overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
	* band_2
	*
	* A value of 0xff stored in the channel_map indicates that the channel
	* is not supported by the hardware at all.
	*
	* A value of 0xfe in the channel_map indicates that the channel is not
	* valid for Tx with the current hardware. This means that
	* while the system can tune and receive on a given channel, it may not
	* be able to associate or transmit any frames on that
	* channel. There is no corresponding channel information for that
	* entry.
	*
	*********************************************************************/

	/**
	* struct iwl_txpwr_section: eeprom section information
	* @offset: indirect address into eeprom image
	* @count: number of "struct iwl_eeprom_enhanced_txpwr" in this section
	* @band: band type for the section
	* @is_common - true: common section, false: channel section
	* @is_cck - true: cck section, false: not cck section
	* @is_ht_40 - true: all channel in the section are HT40 channel,
	* false: legacy or HT 20 MHz
	* ignore if it is common section
	* @iwl_eeprom_section_channel: channel array in the section,
	* ignore if common section
	*/
	struct iwl_txpwr_section {
	u32 offset;
	u8 count;
	enum ieee80211_band band;
	bool is_common;
	bool is_cck;
	bool is_ht40;
	u8 iwl_eeprom_section_channel[EEPROM_MAX_TXPOWER_SECTION_ELEMENTS];
	};

	/**
	* section 1 - 3 are regulatory tx power apply to all channels based on
	* modulation: CCK, OFDM
	* Band: 2.4GHz, 5.2GHz
	* section 4 - 10 are regulatory tx power apply to specified channels
	* For example:
	* 1L - Channel 1 Legacy
	* 1HT - Channel 1 HT
	* (1,+1) - Channel 1 HT40 "_above_"
	*
	* Section 1: all CCK channels
	* Section 2: all 2.4 GHz OFDM (Legacy, HT and HT40) channels
	* Section 3: all 5.2 GHz OFDM (Legacy, HT and HT40) channels
	* Section 4: 2.4 GHz 20MHz channels: 1L, 1HT, 2L, 2HT, 10L, 10HT, 11L, 11HT
	* Section 5: 2.4 GHz 40MHz channels: (1,+1) (2,+1) (6,+1) (7,+1) (9,+1)
	* Section 6: 5.2 GHz 20MHz channels: 36L, 64L, 100L, 36HT, 64HT, 100HT
	* Section 7: 5.2 GHz 40MHz channels: (36,+1) (60,+1) (100,+1)
	* Section 8: 2.4 GHz channel: 13L, 13HT
	* Section 9: 2.4 GHz channel: 140L, 140HT
	* Section 10: 2.4 GHz 40MHz channels: (132,+1) (44,+1)
	*
	*/
	static const struct iwl_txpwr_section enhinfo[] = {
	{ EEPROM_LB_CCK_20_COMMON, 1, IEEE80211_BAND_2GHZ, true, true, false },
	{ EEPROM_LB_OFDM_COMMON, 3, IEEE80211_BAND_2GHZ, true, false, false },
	{ EEPROM_HB_OFDM_COMMON, 3, IEEE80211_BAND_5GHZ, true, false, false },
	{ EEPROM_LB_OFDM_20_BAND, 8, IEEE80211_BAND_2GHZ,
	false, false, false,
	{1, 1, 2, 2, 10, 10, 11, 11 } },
	{ EEPROM_LB_OFDM_HT40_BAND, 5, IEEE80211_BAND_2GHZ,
	false, false, true,
	{ 1, 2, 6, 7, 9 } },
	{ EEPROM_HB_OFDM_20_BAND, 6, IEEE80211_BAND_5GHZ,
	false, false, false,
	{ 36, 64, 100, 36, 64, 100 } },
	{ EEPROM_HB_OFDM_HT40_BAND, 3, IEEE80211_BAND_5GHZ,
	false, false, true,
	{ 36, 60, 100 } },
	{ EEPROM_LB_OFDM_20_CHANNEL_13, 2, IEEE80211_BAND_2GHZ,
	false, false, false,
	{ 13, 13 } },
	{ EEPROM_HB_OFDM_20_CHANNEL_140, 2, IEEE80211_BAND_5GHZ,
	false, false, false,
	{ 140, 140 } },
	{ EEPROM_HB_OFDM_HT40_BAND_1, 2, IEEE80211_BAND_5GHZ,
	false, false, true,
	{ 132, 44 } },
	};

	/******************************************************************************
	*
	* EEPROM related functions
	*
	******************************************************************************/

	/*
	* The device's EEPROM semaphore prevents conflicts between driver and uCode
	* when accessing the EEPROM; each access is a series of pulses to/from the
	* EEPROM chip, not a single event, so even reads could conflict if they
	* weren't arbitrated by the semaphore.
	*/
	int iwlcore_eeprom_acquire_semaphore(struct iwl_priv *priv)
	{
	u16 count;
	int ret;

	for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
	/* Request semaphore */
	iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
	CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

	/* See if we got it */
	ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
	CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
	CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
	EEPROM_SEM_TIMEOUT);
	if (ret >= 0) {
	IWL_DEBUG_IO(priv,
	"Acquired semaphore after %d tries.\n",
	count+1);
	return ret;
	}
	}

	return ret;
	}

	void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
	{
	iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
	CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

	}

	int iwl_eeprom_check_version(struct iwl_priv *priv)
	{
	u16 eeprom_ver;
	u16 calib_ver;

	eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
	calib_ver = priv->cfg->ops->lib->eeprom_ops.calib_version(priv);

	if (eeprom_ver < priv->cfg->eeprom_ver \|\|
	calib_ver < priv->cfg->eeprom_calib_ver)
	goto err;

	IWL_INFO(priv, "device EEPROM VER=0x%x, CALIB=0x%x\n",
	eeprom_ver, calib_ver);

	return 0;
	err:
	IWL_ERR(priv, "Unsupported (too old) EEPROM VER=0x%x < 0x%x "
	"CALIB=0x%x < 0x%x\n",
	eeprom_ver, priv->cfg->eeprom_ver,
	calib_ver, priv->cfg->eeprom_calib_ver);
	return -EINVAL;

	}

	void iwl_eeprom_get_mac(const struct iwl_priv priv, u8 mac)
	{
	const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
	EEPROM_MAC_ADDRESS);
	memcpy(mac, addr, ETH_ALEN);
	}

	/**
	* iwl_get_max_txpower_avg - get the highest tx power from all chains.
	* find the highest tx power from all chains for the channel
	*/
	static s8 iwl_get_max_txpower_avg(struct iwl_priv *priv,
	struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
	int element, s8 *max_txpower_in_half_dbm)
	{
	s8 max_txpower_avg = 0; /* (dBm) */

	IWL_DEBUG_INFO(priv, "%d - "
	"chain_a: %d dB chain_b: %d dB "
	"chain_c: %d dB mimo2: %d dB mimo3: %d dB\n",
	element,
	enhanced_txpower[element].chain_a_max >> 1,
	enhanced_txpower[element].chain_b_max >> 1,
	enhanced_txpower[element].chain_c_max >> 1,
	enhanced_txpower[element].mimo2_max >> 1,
	enhanced_txpower[element].mimo3_max >> 1);
	/* Take the highest tx power from any valid chains */
	if ((priv->cfg->valid_tx_ant & ANT_A) &&
	(enhanced_txpower[element].chain_a_max > max_txpower_avg))
	max_txpower_avg = enhanced_txpower[element].chain_a_max;
	if ((priv->cfg->valid_tx_ant & ANT_B) &&
	(enhanced_txpower[element].chain_b_max > max_txpower_avg))
	max_txpower_avg = enhanced_txpower[element].chain_b_max;
	if ((priv->cfg->valid_tx_ant & ANT_C) &&
	(enhanced_txpower[element].chain_c_max > max_txpower_avg))
	max_txpower_avg = enhanced_txpower[element].chain_c_max;
	if (((priv->cfg->valid_tx_ant == ANT_AB) \|
	(priv->cfg->valid_tx_ant == ANT_BC) \|
	(priv->cfg->valid_tx_ant == ANT_AC)) &&
	(enhanced_txpower[element].mimo2_max > max_txpower_avg))
	max_txpower_avg = enhanced_txpower[element].mimo2_max;
	if ((priv->cfg->valid_tx_ant == ANT_ABC) &&
	(enhanced_txpower[element].mimo3_max > max_txpower_avg))
	max_txpower_avg = enhanced_txpower[element].mimo3_max;

	/*
	* max. tx power in EEPROM is in 1/2 dBm format
	* convert from 1/2 dBm to dBm (round-up convert)
	* but we also do not want to loss 1/2 dBm resolution which
	* will impact performance
	*/
	*max_txpower_in_half_dbm = max_txpower_avg;
	return (max_txpower_avg & 0x01) + (max_txpower_avg >> 1);
	}

	/**
	* iwl_update_common_txpower: update channel tx power
	* update tx power per band based on EEPROM enhanced tx power info.
	*/
	static s8 iwl_update_common_txpower(struct iwl_priv *priv,
	struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
	int section, int element, s8 *max_txpower_in_half_dbm)
	{
	struct iwl_channel_info *ch_info;
	int ch;
	bool is_ht40 = false;
	s8 max_txpower_avg; /* (dBm) */

	/* it is common section, contain all type (Legacy, HT and HT40)
	* based on the element in the section to determine
	* is it HT 40 or not
	*/
	if (element == EEPROM_TXPOWER_COMMON_HT40_INDEX)
	is_ht40 = true;
	max_txpower_avg =
	iwl_get_max_txpower_avg(priv, enhanced_txpower,
	element, max_txpower_in_half_dbm);

	ch_info = priv->channel_info;

	for (ch = 0; ch < priv->channel_count; ch++) {
	/* find matching band and update tx power if needed */
	if ((ch_info->band == enhinfo[section].band) &&
	(ch_info->max_power_avg < max_txpower_avg) &&
	(!is_ht40)) {
	/* Update regulatory-based run-time data */
	ch_info->max_power_avg = ch_info->curr_txpow =
	max_txpower_avg;
	ch_info->scan_power = max_txpower_avg;
	}
	if ((ch_info->band == enhinfo[section].band) && is_ht40 &&
	(ch_info->ht40_max_power_avg < max_txpower_avg)) {
	/* Update regulatory-based run-time data */
	ch_info->ht40_max_power_avg = max_txpower_avg;
	}
	ch_info++;
	}
	return max_txpower_avg;
	}

	/**
	* iwl_update_channel_txpower: update channel tx power
	* update channel tx power based on EEPROM enhanced tx power info.
	*/
	static s8 iwl_update_channel_txpower(struct iwl_priv *priv,
	struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
	int section, int element, s8 *max_txpower_in_half_dbm)
	{
	struct iwl_channel_info *ch_info;
	int ch;
	u8 channel;
	s8 max_txpower_avg; /* (dBm) */

	channel = enhinfo[section].iwl_eeprom_section_channel[element];
	max_txpower_avg =
	iwl_get_max_txpower_avg(priv, enhanced_txpower,
	element, max_txpower_in_half_dbm);

	ch_info = priv->channel_info;
	for (ch = 0; ch < priv->channel_count; ch++) {
	/* find matching channel and update tx power if needed */
	if (ch_info->channel == channel) {
	if ((ch_info->max_power_avg < max_txpower_avg) &&
	(!enhinfo[section].is_ht40)) {
	/* Update regulatory-based run-time data */
	ch_info->max_power_avg = max_txpower_avg;
	ch_info->curr_txpow = max_txpower_avg;
	ch_info->scan_power = max_txpower_avg;
	}
	if ((enhinfo[section].is_ht40) &&
	(ch_info->ht40_max_power_avg < max_txpower_avg)) {
	/* Update regulatory-based run-time data */
	ch_info->ht40_max_power_avg = max_txpower_avg;
	}
	break;
	}
	ch_info++;
	}
	return max_txpower_avg;
	}

	/**
	* iwlcore_eeprom_enhanced_txpower: process enhanced tx power info
	*/
	void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
	{
	int eeprom_section_count = 0;
	int section, element;
	struct iwl_eeprom_enhanced_txpwr *enhanced_txpower;
	u32 offset;
	s8 max_txpower_avg; /* (dBm) */
	s8 max_txpower_in_half_dbm; /* (half-dBm) */

	/* Loop through all the sections
	* adjust bands and channel's max tx power
	* Set the tx_power_user_lmt to the highest power
	* supported by any channels and chains
	*/
	for (section = 0; section < ARRAY_SIZE(enhinfo); section++) {
	eeprom_section_count = enhinfo[section].count;
	offset = enhinfo[section].offset;
	enhanced_txpower = (struct iwl_eeprom_enhanced_txpwr *)
	iwl_eeprom_query_addr(priv, offset);

	/*
	* check for valid entry -
	* different version of EEPROM might contain different set
	* of enhanced tx power table
	* always check for valid entry before process
	* the information
	*/
	if (!enhanced_txpower->common \|\| enhanced_txpower->reserved)
	continue;

	for (element = 0; element < eeprom_section_count; element++) {
	if (enhinfo[section].is_common)
	max_txpower_avg =
	iwl_update_common_txpower(priv,
	enhanced_txpower, section,
	element,
	&max_txpower_in_half_dbm);
	else
	max_txpower_avg =
	iwl_update_channel_txpower(priv,
	enhanced_txpower, section,
	element,
	&max_txpower_in_half_dbm);

	/* Update the tx_power_user_lmt to the highest power
	* supported by any channel */
	if (max_txpower_avg > priv->tx_power_user_lmt)
	priv->tx_power_user_lmt = max_txpower_avg;

	/*
	* Update the tx_power_lmt_in_half_dbm to
	* the highest power supported by any channel
	*/
	if (max_txpower_in_half_dbm >
	priv->tx_power_lmt_in_half_dbm)
	priv->tx_power_lmt_in_half_dbm =
	max_txpower_in_half_dbm;
	}
	}
	}