drivers/net/wireless/iwlwifi/mvm/tt.c - nest-cam/v366/kernel_backports - Git at Google

 /******************************************************************************
  *
  * 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) 2013 - 2014 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 COPYING.
  *
  * 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) 2012 - 2014 Intel Corporation. All rights reserved.
  * All rights reserved.
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  * modification, are permitted provided that the following conditions
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  *  * 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
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  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
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  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  *****************************************************************************/

 #include "mvm.h"
 #include "iwl-config.h"
 #include "iwl-io.h"
 #include "iwl-csr.h"
 #include "iwl-prph.h"

 #define OTP_DTS_DIODE_DEVIATION 96 /*in words*/
 /* VBG - Voltage Band Gap error data (temperature offset) */
 #define OTP_WP_DTS_VBG			(OTP_DTS_DIODE_DEVIATION + 2)
 #define MEAS_VBG_MIN_VAL		2300
 #define MEAS_VBG_MAX_VAL		3000
 #define MEAS_VBG_DEFAULT_VAL		2700
 #define DTS_DIODE_VALID(flags)		(flags & DTS_DIODE_REG_FLAGS_PASS_ONCE)
 #define MIN_TEMPERATURE			0
 #define MAX_TEMPERATURE			125
 #define TEMPERATURE_ERROR		(MAX_TEMPERATURE + 1)
 #define PTAT_DIGITAL_VALUE_MIN_VALUE	0
 #define PTAT_DIGITAL_VALUE_MAX_VALUE	0xFF
 #define DTS_VREFS_NUM			5
 static inline u32 DTS_DIODE_GET_VREFS_ID(u32 flags)
 {
 	return (flags & DTS_DIODE_REG_FLAGS_VREFS_ID) >>
 					DTS_DIODE_REG_FLAGS_VREFS_ID_POS;
 }

 #define CALC_VREFS_MIN_DIFF	43
 #define CALC_VREFS_MAX_DIFF	51
 #define CALC_LUT_SIZE		(1 + CALC_VREFS_MAX_DIFF - CALC_VREFS_MIN_DIFF)
 #define CALC_LUT_INDEX_OFFSET	CALC_VREFS_MIN_DIFF
 #define CALC_TEMPERATURE_RESULT_SHIFT_OFFSET	23

 /*
  * @digital_value: The diode's digital-value sampled (temperature/voltage)
  * @vref_low: The lower voltage-reference (the vref just below the diode's
  *	sampled digital-value)
  * @vref_high: The higher voltage-reference (the vref just above the diode's
  *	sampled digital-value)
  * @flags: bits[1:0]: The ID of the Vrefs pair (lowVref,highVref)
  *	bits[6:2]: Reserved.
  *	bits[7:7]: Indicates completion of at least 1 successful sample
  *	since last DTS reset.
  */
 struct iwl_mvm_dts_diode_bits {
 	u8 digital_value;
 	u8 vref_low;
 	u8 vref_high;
 	u8 flags;
 } __packed;

 union dts_diode_results {
 	u32 reg_value;
 	struct iwl_mvm_dts_diode_bits bits;
 } __packed;

 static s16 iwl_mvm_dts_get_volt_band_gap(struct iwl_mvm *mvm)
 {
 	struct iwl_nvm_section calib_sec;
 	const __le16 *calib;
 	u16 vbg;

 	/* TODO: move parsing to NVM code */
 	calib_sec = mvm->nvm_sections[NVM_SECTION_TYPE_CALIBRATION];
 	calib = (__le16 *)calib_sec.data;

 	vbg = le16_to_cpu(calib[OTP_WP_DTS_VBG]);

 	if (vbg < MEAS_VBG_MIN_VAL || vbg > MEAS_VBG_MAX_VAL)
 		vbg = MEAS_VBG_DEFAULT_VAL;

 	return vbg;
 }

 static u16 iwl_mvm_dts_get_ptat_deviation_offset(struct iwl_mvm *mvm)
 {
 	const u8 *calib;
 	u8 ptat, pa1, pa2, median;

 	/* TODO: move parsing to NVM code */
 	calib = mvm->nvm_sections[NVM_SECTION_TYPE_CALIBRATION].data;
 	ptat = calib[OTP_DTS_DIODE_DEVIATION];
 	pa1 = calib[OTP_DTS_DIODE_DEVIATION + 1];
 	pa2 = calib[OTP_DTS_DIODE_DEVIATION + 2];

 	/* get the median: */
 	if (ptat > pa1) {
 		if (ptat > pa2)
 			median = (pa1 > pa2) ? pa1 : pa2;
 		else
 			median = ptat;
 	} else {
 		if (pa1 > pa2)
 			median = (ptat > pa2) ? ptat : pa2;
 		else
 			median = pa1;
 	}

 	return ptat - median;
 }

 static u8 iwl_mvm_dts_calibrate_ptat_deviation(struct iwl_mvm *mvm, u8 value)
 {
 	/* Calibrate the PTAT digital value, based on PTAT deviation data: */
 	s16 new_val = value - iwl_mvm_dts_get_ptat_deviation_offset(mvm);

 	if (new_val > PTAT_DIGITAL_VALUE_MAX_VALUE)
 		new_val = PTAT_DIGITAL_VALUE_MAX_VALUE;
 	else if (new_val < PTAT_DIGITAL_VALUE_MIN_VALUE)
 		new_val = PTAT_DIGITAL_VALUE_MIN_VALUE;

 	return new_val;
 }

 static bool dts_get_adjacent_vrefs(struct iwl_mvm *mvm,
 				   union dts_diode_results *avg_ptat)
 {
 	u8 vrefs_results[DTS_VREFS_NUM];
 	u8 low_vref_index = 0, flags;
 	u32 reg;

 	reg = iwl_read_prph(mvm->trans, DTSC_VREF_AVG);
 	memcpy(vrefs_results, &reg, sizeof(reg));
 	reg = iwl_read_prph(mvm->trans, DTSC_VREF5_AVG);
 	vrefs_results[4] = reg & 0xff;

 	if (avg_ptat->bits.digital_value < vrefs_results[0] ||
 	    avg_ptat->bits.digital_value > vrefs_results[4])
 		return false;

 	if (avg_ptat->bits.digital_value > vrefs_results[3])
 		low_vref_index = 3;
 	else if (avg_ptat->bits.digital_value > vrefs_results[2])
 		low_vref_index = 2;
 	else if (avg_ptat->bits.digital_value > vrefs_results[1])
 		low_vref_index = 1;

 	avg_ptat->bits.vref_low  = vrefs_results[low_vref_index];
 	avg_ptat->bits.vref_high = vrefs_results[low_vref_index + 1];
 	flags = avg_ptat->bits.flags;
 	avg_ptat->bits.flags =
 		(flags & ~DTS_DIODE_REG_FLAGS_VREFS_ID) |
 		(low_vref_index & DTS_DIODE_REG_FLAGS_VREFS_ID);
 	return true;
 }

 /*
  * return true it the results are valid, and false otherwise.
  */
 static bool dts_read_ptat_avg_results(struct iwl_mvm *mvm,
 				      union dts_diode_results *avg_ptat)
 {
 	u32 reg;
 	u8 tmp;

 	/* fill the diode value and pass_once with avg-reg results */
 	reg = iwl_read_prph(mvm->trans, DTSC_PTAT_AVG);
 	reg &= DTS_DIODE_REG_DIG_VAL | DTS_DIODE_REG_PASS_ONCE;
 	avg_ptat->reg_value = reg;

 	/* calibrate the PTAT digital value */
 	tmp = avg_ptat->bits.digital_value;
 	tmp = iwl_mvm_dts_calibrate_ptat_deviation(mvm, tmp);
 	avg_ptat->bits.digital_value = tmp;

 	/*
 	 * fill vrefs fields, based on the avgVrefs results
 	 * and the diode value
 	 */
 	return dts_get_adjacent_vrefs(mvm, avg_ptat) &&
 		DTS_DIODE_VALID(avg_ptat->bits.flags);
 }

 static s32 calculate_nic_temperature(union dts_diode_results avg_ptat,
 				     u16 volt_band_gap)
 {
 	u32 tmp_result;
 	u8 vrefs_diff;
 	/*
 	 * For temperature calculation (at the end, shift right by 23)
 	 * LUT[(D2-D1)] = ROUND{ 2^23 / ((D2-D1)*9*10) }
 	 * (D2-D1) ==   43    44    45    46    47    48    49    50    51
 	 */
 	static const u16 calc_lut[CALC_LUT_SIZE] = {
 		2168, 2118, 2071, 2026, 1983, 1942, 1902, 1864, 1828,
 	};

 	/*
 	 * The diff between the high and low voltage-references is assumed
 	 * to be strictly be in range of [60,68]
 	 */
 	vrefs_diff = avg_ptat.bits.vref_high - avg_ptat.bits.vref_low;

 	if (vrefs_diff < CALC_VREFS_MIN_DIFF ||
 	    vrefs_diff > CALC_VREFS_MAX_DIFF)
 		return TEMPERATURE_ERROR;

 	/* calculate the result: */
 	tmp_result =
 		vrefs_diff * (DTS_DIODE_GET_VREFS_ID(avg_ptat.bits.flags) + 9);
 	tmp_result += avg_ptat.bits.digital_value;
 	tmp_result -= avg_ptat.bits.vref_high;

 	/* multiply by the LUT value (based on the diff) */
 	tmp_result *= calc_lut[vrefs_diff - CALC_LUT_INDEX_OFFSET];

 	/*
 	 * Get the BandGap (the voltage refereces source) error data
 	 * (temperature offset)
 	 */
 	tmp_result *= volt_band_gap;

 	/*
 	 * here, tmp_result value can be up to 32-bits. We want to right-shift
 	 * it *without* sign-extend.
 	 */
 	tmp_result = tmp_result >> CALC_TEMPERATURE_RESULT_SHIFT_OFFSET;

 	/*
 	 * at this point, tmp_result should be in the range:
 	 * 200 <= tmp_result <= 365
 	 */
 	return (s16)tmp_result - 240;
 }

 static s32 check_nic_temperature(struct iwl_mvm *mvm)
 {
 	u16 volt_band_gap;
 	union dts_diode_results avg_ptat;

 	volt_band_gap = iwl_mvm_dts_get_volt_band_gap(mvm);

 	/* disable DTS */
 	iwl_write_prph(mvm->trans, SHR_MISC_WFM_DTS_EN, 0);

 	/* SV initialization */
 	iwl_write_prph(mvm->trans, SHR_MISC_WFM_DTS_EN, 1);
 	iwl_write_prph(mvm->trans, DTSC_CFG_MODE,
 		       DTSC_CFG_MODE_PERIODIC);

 	/* wait for results */
 	msleep(100);
 	if (!dts_read_ptat_avg_results(mvm, &avg_ptat))
 		return TEMPERATURE_ERROR;

 	/* disable DTS */
 	iwl_write_prph(mvm->trans, SHR_MISC_WFM_DTS_EN, 0);

 	return calculate_nic_temperature(avg_ptat, volt_band_gap);
 }

 static void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
 {
 	u32 duration = mvm->thermal_throttle.params->ct_kill_duration;

 	IWL_ERR(mvm, "Enter CT Kill\n");
 	iwl_mvm_set_hw_ctkill_state(mvm, true);
 	schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
 			      round_jiffies_relative(duration * HZ));
 }

 static void iwl_mvm_exit_ctkill(struct iwl_mvm *mvm)
 {
 	IWL_ERR(mvm, "Exit CT Kill\n");
 	iwl_mvm_set_hw_ctkill_state(mvm, false);
 }

 static void check_exit_ctkill(struct work_struct *work)
 {
 	struct iwl_mvm_tt_mgmt *tt;
 	struct iwl_mvm *mvm;
 	u32 duration;
 	s32 temp;

 	tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
 	mvm = container_of(tt, struct iwl_mvm, thermal_throttle);

 	duration = tt->params->ct_kill_duration;

 	iwl_trans_start_hw(mvm->trans);
 	temp = check_nic_temperature(mvm);
 	iwl_trans_stop_device(mvm->trans);

 	if (temp < MIN_TEMPERATURE || temp > MAX_TEMPERATURE) {
 		IWL_DEBUG_TEMP(mvm, "Failed to measure NIC temperature\n");
 		goto reschedule;
 	}
 	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);

 	if (temp <= tt->params->ct_kill_exit) {
 		iwl_mvm_exit_ctkill(mvm);
 		return;
 	}

 reschedule:
 	schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
 			      round_jiffies(duration * HZ));
 }

 static void iwl_mvm_tt_smps_iterator(void *_data, u8 *mac,
 				     struct ieee80211_vif *vif)
 {
 	struct iwl_mvm *mvm = _data;
 	enum ieee80211_smps_mode smps_mode;

 	lockdep_assert_held(&mvm->mutex);

 	if (mvm->thermal_throttle.dynamic_smps)
 		smps_mode = IEEE80211_SMPS_DYNAMIC;
 	else
 		smps_mode = IEEE80211_SMPS_AUTOMATIC;

 	if (vif->type != NL80211_IFTYPE_STATION)
 		return;

 	iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
 }

 static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
 {
 	struct ieee80211_sta *sta;
 	struct iwl_mvm_sta *mvmsta;
 	int i, err;

 	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 						lockdep_is_held(&mvm->mutex));
 		if (IS_ERR_OR_NULL(sta))
 			continue;
 		mvmsta = iwl_mvm_sta_from_mac80211(sta);
 		if (enable == mvmsta->tt_tx_protection)
 			continue;
 		err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
 		if (err) {
 			IWL_ERR(mvm, "Failed to %s Tx protection\n",
 				enable ? "enable" : "disable");
 		} else {
 			IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
 				       enable ? "Enable" : "Disable");
 			mvmsta->tt_tx_protection = enable;
 		}
 	}
 }

 static void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
 {
 	struct iwl_host_cmd cmd = {
 		.id = REPLY_THERMAL_MNG_BACKOFF,
 		.len = { sizeof(u32), },
 		.data = { &backoff, },
 		.flags = CMD_SYNC,
 	};

 	if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
 		IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
 			       backoff);
 		mvm->thermal_throttle.tx_backoff = backoff;
 	} else {
 		IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
 	}
 }

 void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
 {
 	const struct iwl_tt_params *params = mvm->thermal_throttle.params;
 	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 	s32 temperature = mvm->temperature;
 	bool throttle_enable = false;
 	int i;
 	u32 tx_backoff;

 	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);

 	if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
 		iwl_mvm_enter_ctkill(mvm);
 		return;
 	}

 	if (params->support_dynamic_smps) {
 		if (!tt->dynamic_smps &&
 		    temperature >= params->dynamic_smps_entry) {
 			IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
 			tt->dynamic_smps = true;
 			ieee80211_iterate_active_interfaces_atomic(
 					mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 					iwl_mvm_tt_smps_iterator, mvm);
 			throttle_enable = true;
 		} else if (tt->dynamic_smps &&
 			   temperature <= params->dynamic_smps_exit) {
 			IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
 			tt->dynamic_smps = false;
 			ieee80211_iterate_active_interfaces_atomic(
 					mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 					iwl_mvm_tt_smps_iterator, mvm);
 		}
 	}

 	if (params->support_tx_protection) {
 		if (temperature >= params->tx_protection_entry) {
 			iwl_mvm_tt_tx_protection(mvm, true);
 			throttle_enable = true;
 		} else if (temperature <= params->tx_protection_exit) {
 			iwl_mvm_tt_tx_protection(mvm, false);
 		}
 	}

 	if (params->support_tx_backoff) {
 		tx_backoff = 0;
 		for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
 			if (temperature < params->tx_backoff[i].temperature)
 				break;
 			tx_backoff = params->tx_backoff[i].backoff;
 		}
 		if (tx_backoff != 0)
 			throttle_enable = true;
 		if (tt->tx_backoff != tx_backoff)
 			iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
 	}

 	if (!tt->throttle && throttle_enable) {
 		IWL_WARN(mvm,
 			 "Due to high temperature thermal throttling initiated\n");
 		tt->throttle = true;
 	} else if (tt->throttle && !tt->dynamic_smps && tt->tx_backoff == 0 &&
 		   temperature <= params->tx_protection_exit) {
 		IWL_WARN(mvm,
 			 "Temperature is back to normal thermal throttling stopped\n");
 		tt->throttle = false;
 	}
 }

 static const struct iwl_tt_params iwl7000_tt_params = {
 	.ct_kill_entry = 118,
 	.ct_kill_exit = 96,
 	.ct_kill_duration = 5,
 	.dynamic_smps_entry = 114,
 	.dynamic_smps_exit = 110,
 	.tx_protection_entry = 114,
 	.tx_protection_exit = 108,
 	.tx_backoff = {
 		{.temperature = 112, .backoff = 200},
 		{.temperature = 113, .backoff = 600},
 		{.temperature = 114, .backoff = 1200},
 		{.temperature = 115, .backoff = 2000},
 		{.temperature = 116, .backoff = 4000},
 		{.temperature = 117, .backoff = 10000},
 	},
 	.support_ct_kill = true,
 	.support_dynamic_smps = true,
 	.support_tx_protection = true,
 	.support_tx_backoff = true,
 };

 static const struct iwl_tt_params iwl7000_high_temp_tt_params = {
 	.ct_kill_entry = 118,
 	.ct_kill_exit = 96,
 	.ct_kill_duration = 5,
 	.dynamic_smps_entry = 114,
 	.dynamic_smps_exit = 110,
 	.tx_protection_entry = 114,
 	.tx_protection_exit = 108,
 	.tx_backoff = {
 		{.temperature = 112, .backoff = 300},
 		{.temperature = 113, .backoff = 800},
 		{.temperature = 114, .backoff = 1500},
 		{.temperature = 115, .backoff = 3000},
 		{.temperature = 116, .backoff = 5000},
 		{.temperature = 117, .backoff = 10000},
 	},
 	.support_ct_kill = true,
 	.support_dynamic_smps = true,
 	.support_tx_protection = true,
 	.support_tx_backoff = true,
 };

 void iwl_mvm_tt_initialize(struct iwl_mvm *mvm)
 {
 	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;

 	IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");

 	if (mvm->cfg->high_temp)
 		tt->params = &iwl7000_high_temp_tt_params;
 	else
 		tt->params = &iwl7000_tt_params;

 	tt->throttle = false;
 	INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);
 }

 void iwl_mvm_tt_exit(struct iwl_mvm *mvm)
 {
 	cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
 	IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");
 }
	/******************************************************************************
	*
	* 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) 2013 - 2014 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 COPYING.
	*
	* 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) 2012 - 2014 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 "mvm.h"
	#include "iwl-config.h"
	#include "iwl-io.h"
	#include "iwl-csr.h"
	#include "iwl-prph.h"

	#define OTP_DTS_DIODE_DEVIATION 96 /in words/
	/* VBG - Voltage Band Gap error data (temperature offset) */
	#define OTP_WP_DTS_VBG (OTP_DTS_DIODE_DEVIATION + 2)
	#define MEAS_VBG_MIN_VAL 2300
	#define MEAS_VBG_MAX_VAL 3000
	#define MEAS_VBG_DEFAULT_VAL 2700
	#define DTS_DIODE_VALID(flags) (flags & DTS_DIODE_REG_FLAGS_PASS_ONCE)
	#define MIN_TEMPERATURE 0
	#define MAX_TEMPERATURE 125
	#define TEMPERATURE_ERROR (MAX_TEMPERATURE + 1)
	#define PTAT_DIGITAL_VALUE_MIN_VALUE 0
	#define PTAT_DIGITAL_VALUE_MAX_VALUE 0xFF
	#define DTS_VREFS_NUM 5
	static inline u32 DTS_DIODE_GET_VREFS_ID(u32 flags)
	{
	return (flags & DTS_DIODE_REG_FLAGS_VREFS_ID) >>
	DTS_DIODE_REG_FLAGS_VREFS_ID_POS;
	}

	#define CALC_VREFS_MIN_DIFF 43
	#define CALC_VREFS_MAX_DIFF 51
	#define CALC_LUT_SIZE (1 + CALC_VREFS_MAX_DIFF - CALC_VREFS_MIN_DIFF)
	#define CALC_LUT_INDEX_OFFSET CALC_VREFS_MIN_DIFF
	#define CALC_TEMPERATURE_RESULT_SHIFT_OFFSET 23

	/*
	* @digital_value: The diode's digital-value sampled (temperature/voltage)
	* @vref_low: The lower voltage-reference (the vref just below the diode's
	* sampled digital-value)
	* @vref_high: The higher voltage-reference (the vref just above the diode's
	* sampled digital-value)
	* @flags: bits[1:0]: The ID of the Vrefs pair (lowVref,highVref)
	* bits[6:2]: Reserved.
	* bits[7:7]: Indicates completion of at least 1 successful sample
	* since last DTS reset.
	*/
	struct iwl_mvm_dts_diode_bits {
	u8 digital_value;
	u8 vref_low;
	u8 vref_high;
	u8 flags;
	} __packed;

	union dts_diode_results {
	u32 reg_value;
	struct iwl_mvm_dts_diode_bits bits;
	} __packed;

	static s16 iwl_mvm_dts_get_volt_band_gap(struct iwl_mvm *mvm)
	{
	struct iwl_nvm_section calib_sec;
	const __le16 *calib;
	u16 vbg;

	/* TODO: move parsing to NVM code */
	calib_sec = mvm->nvm_sections[NVM_SECTION_TYPE_CALIBRATION];
	calib = (__le16 *)calib_sec.data;

	vbg = le16_to_cpu(calib[OTP_WP_DTS_VBG]);

	if (vbg < MEAS_VBG_MIN_VAL \|\| vbg > MEAS_VBG_MAX_VAL)
	vbg = MEAS_VBG_DEFAULT_VAL;

	return vbg;
	}

	static u16 iwl_mvm_dts_get_ptat_deviation_offset(struct iwl_mvm *mvm)
	{
	const u8 *calib;
	u8 ptat, pa1, pa2, median;

	/* TODO: move parsing to NVM code */
	calib = mvm->nvm_sections[NVM_SECTION_TYPE_CALIBRATION].data;
	ptat = calib[OTP_DTS_DIODE_DEVIATION];
	pa1 = calib[OTP_DTS_DIODE_DEVIATION + 1];
	pa2 = calib[OTP_DTS_DIODE_DEVIATION + 2];

	/* get the median: */
	if (ptat > pa1) {
	if (ptat > pa2)
	median = (pa1 > pa2) ? pa1 : pa2;
	else
	median = ptat;
	} else {
	if (pa1 > pa2)
	median = (ptat > pa2) ? ptat : pa2;
	else
	median = pa1;
	}

	return ptat - median;
	}

	static u8 iwl_mvm_dts_calibrate_ptat_deviation(struct iwl_mvm *mvm, u8 value)
	{
	/* Calibrate the PTAT digital value, based on PTAT deviation data: */
	s16 new_val = value - iwl_mvm_dts_get_ptat_deviation_offset(mvm);

	if (new_val > PTAT_DIGITAL_VALUE_MAX_VALUE)
	new_val = PTAT_DIGITAL_VALUE_MAX_VALUE;
	else if (new_val < PTAT_DIGITAL_VALUE_MIN_VALUE)
	new_val = PTAT_DIGITAL_VALUE_MIN_VALUE;

	return new_val;
	}

	static bool dts_get_adjacent_vrefs(struct iwl_mvm *mvm,
	union dts_diode_results *avg_ptat)
	{
	u8 vrefs_results[DTS_VREFS_NUM];
	u8 low_vref_index = 0, flags;
	u32 reg;

	reg = iwl_read_prph(mvm->trans, DTSC_VREF_AVG);
	memcpy(vrefs_results, &reg, sizeof(reg));
	reg = iwl_read_prph(mvm->trans, DTSC_VREF5_AVG);
	vrefs_results[4] = reg & 0xff;

	if (avg_ptat->bits.digital_value < vrefs_results[0] \|\|
	avg_ptat->bits.digital_value > vrefs_results[4])
	return false;

	if (avg_ptat->bits.digital_value > vrefs_results[3])
	low_vref_index = 3;
	else if (avg_ptat->bits.digital_value > vrefs_results[2])
	low_vref_index = 2;
	else if (avg_ptat->bits.digital_value > vrefs_results[1])
	low_vref_index = 1;

	avg_ptat->bits.vref_low = vrefs_results[low_vref_index];
	avg_ptat->bits.vref_high = vrefs_results[low_vref_index + 1];
	flags = avg_ptat->bits.flags;
	avg_ptat->bits.flags =
	(flags & ~DTS_DIODE_REG_FLAGS_VREFS_ID) \|
	(low_vref_index & DTS_DIODE_REG_FLAGS_VREFS_ID);
	return true;
	}

	/*
	* return true it the results are valid, and false otherwise.
	*/
	static bool dts_read_ptat_avg_results(struct iwl_mvm *mvm,
	union dts_diode_results *avg_ptat)
	{
	u32 reg;
	u8 tmp;

	/* fill the diode value and pass_once with avg-reg results */
	reg = iwl_read_prph(mvm->trans, DTSC_PTAT_AVG);
	reg &= DTS_DIODE_REG_DIG_VAL \| DTS_DIODE_REG_PASS_ONCE;
	avg_ptat->reg_value = reg;

	/* calibrate the PTAT digital value */
	tmp = avg_ptat->bits.digital_value;
	tmp = iwl_mvm_dts_calibrate_ptat_deviation(mvm, tmp);
	avg_ptat->bits.digital_value = tmp;

	/*
	* fill vrefs fields, based on the avgVrefs results
	* and the diode value
	*/
	return dts_get_adjacent_vrefs(mvm, avg_ptat) &&
	DTS_DIODE_VALID(avg_ptat->bits.flags);
	}

	static s32 calculate_nic_temperature(union dts_diode_results avg_ptat,
	u16 volt_band_gap)
	{
	u32 tmp_result;
	u8 vrefs_diff;
	/*
	* For temperature calculation (at the end, shift right by 23)
	* LUT[(D2-D1)] = ROUND{ 2^23 / ((D2-D1)910) }
	* (D2-D1) == 43 44 45 46 47 48 49 50 51
	*/
	static const u16 calc_lut[CALC_LUT_SIZE] = {
	2168, 2118, 2071, 2026, 1983, 1942, 1902, 1864, 1828,
	};

	/*
	* The diff between the high and low voltage-references is assumed
	* to be strictly be in range of [60,68]
	*/
	vrefs_diff = avg_ptat.bits.vref_high - avg_ptat.bits.vref_low;

	if (vrefs_diff < CALC_VREFS_MIN_DIFF \|\|
	vrefs_diff > CALC_VREFS_MAX_DIFF)
	return TEMPERATURE_ERROR;

	/* calculate the result: */
	tmp_result =
	vrefs_diff * (DTS_DIODE_GET_VREFS_ID(avg_ptat.bits.flags) + 9);
	tmp_result += avg_ptat.bits.digital_value;
	tmp_result -= avg_ptat.bits.vref_high;

	/* multiply by the LUT value (based on the diff) */
	tmp_result *= calc_lut[vrefs_diff - CALC_LUT_INDEX_OFFSET];

	/*
	* Get the BandGap (the voltage refereces source) error data
	* (temperature offset)
	*/
	tmp_result *= volt_band_gap;

	/*
	* here, tmp_result value can be up to 32-bits. We want to right-shift
	* it without sign-extend.
	*/
	tmp_result = tmp_result >> CALC_TEMPERATURE_RESULT_SHIFT_OFFSET;

	/*
	* at this point, tmp_result should be in the range:
	* 200 <= tmp_result <= 365
	*/
	return (s16)tmp_result - 240;
	}

	static s32 check_nic_temperature(struct iwl_mvm *mvm)
	{
	u16 volt_band_gap;
	union dts_diode_results avg_ptat;

	volt_band_gap = iwl_mvm_dts_get_volt_band_gap(mvm);

	/* disable DTS */
	iwl_write_prph(mvm->trans, SHR_MISC_WFM_DTS_EN, 0);

	/* SV initialization */
	iwl_write_prph(mvm->trans, SHR_MISC_WFM_DTS_EN, 1);
	iwl_write_prph(mvm->trans, DTSC_CFG_MODE,
	DTSC_CFG_MODE_PERIODIC);

	/* wait for results */
	msleep(100);
	if (!dts_read_ptat_avg_results(mvm, &avg_ptat))
	return TEMPERATURE_ERROR;

	/* disable DTS */
	iwl_write_prph(mvm->trans, SHR_MISC_WFM_DTS_EN, 0);

	return calculate_nic_temperature(avg_ptat, volt_band_gap);
	}

	static void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
	{
	u32 duration = mvm->thermal_throttle.params->ct_kill_duration;

	IWL_ERR(mvm, "Enter CT Kill\n");
	iwl_mvm_set_hw_ctkill_state(mvm, true);
	schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
	round_jiffies_relative(duration * HZ));
	}

	static void iwl_mvm_exit_ctkill(struct iwl_mvm *mvm)
	{
	IWL_ERR(mvm, "Exit CT Kill\n");
	iwl_mvm_set_hw_ctkill_state(mvm, false);
	}

	static void check_exit_ctkill(struct work_struct *work)
	{
	struct iwl_mvm_tt_mgmt *tt;
	struct iwl_mvm *mvm;
	u32 duration;
	s32 temp;

	tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
	mvm = container_of(tt, struct iwl_mvm, thermal_throttle);

	duration = tt->params->ct_kill_duration;

	iwl_trans_start_hw(mvm->trans);
	temp = check_nic_temperature(mvm);
	iwl_trans_stop_device(mvm->trans);

	if (temp < MIN_TEMPERATURE \|\| temp > MAX_TEMPERATURE) {
	IWL_DEBUG_TEMP(mvm, "Failed to measure NIC temperature\n");
	goto reschedule;
	}
	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);

	if (temp <= tt->params->ct_kill_exit) {
	iwl_mvm_exit_ctkill(mvm);
	return;
	}

	reschedule:
	schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
	round_jiffies(duration * HZ));
	}

	static void iwl_mvm_tt_smps_iterator(void _data, u8 mac,
	struct ieee80211_vif *vif)
	{
	struct iwl_mvm *mvm = _data;
	enum ieee80211_smps_mode smps_mode;

	lockdep_assert_held(&mvm->mutex);

	if (mvm->thermal_throttle.dynamic_smps)
	smps_mode = IEEE80211_SMPS_DYNAMIC;
	else
	smps_mode = IEEE80211_SMPS_AUTOMATIC;

	if (vif->type != NL80211_IFTYPE_STATION)
	return;

	iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
	}

	static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
	{
	struct ieee80211_sta *sta;
	struct iwl_mvm_sta *mvmsta;
	int i, err;

	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
	sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
	lockdep_is_held(&mvm->mutex));
	if (IS_ERR_OR_NULL(sta))
	continue;
	mvmsta = iwl_mvm_sta_from_mac80211(sta);
	if (enable == mvmsta->tt_tx_protection)
	continue;
	err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
	if (err) {
	IWL_ERR(mvm, "Failed to %s Tx protection\n",
	enable ? "enable" : "disable");
	} else {
	IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
	enable ? "Enable" : "Disable");
	mvmsta->tt_tx_protection = enable;
	}
	}
	}

	static void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
	{
	struct iwl_host_cmd cmd = {
	.id = REPLY_THERMAL_MNG_BACKOFF,
	.len = { sizeof(u32), },
	.data = { &backoff, },
	.flags = CMD_SYNC,
	};

	if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
	IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
	backoff);
	mvm->thermal_throttle.tx_backoff = backoff;
	} else {
	IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
	}
	}

	void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
	{
	const struct iwl_tt_params *params = mvm->thermal_throttle.params;
	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
	s32 temperature = mvm->temperature;
	bool throttle_enable = false;
	int i;
	u32 tx_backoff;

	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);

	if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
	iwl_mvm_enter_ctkill(mvm);
	return;
	}

	if (params->support_dynamic_smps) {
	if (!tt->dynamic_smps &&
	temperature >= params->dynamic_smps_entry) {
	IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
	tt->dynamic_smps = true;
	ieee80211_iterate_active_interfaces_atomic(
	mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
	iwl_mvm_tt_smps_iterator, mvm);
	throttle_enable = true;
	} else if (tt->dynamic_smps &&
	temperature <= params->dynamic_smps_exit) {
	IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
	tt->dynamic_smps = false;
	ieee80211_iterate_active_interfaces_atomic(
	mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
	iwl_mvm_tt_smps_iterator, mvm);
	}
	}

	if (params->support_tx_protection) {
	if (temperature >= params->tx_protection_entry) {
	iwl_mvm_tt_tx_protection(mvm, true);
	throttle_enable = true;
	} else if (temperature <= params->tx_protection_exit) {
	iwl_mvm_tt_tx_protection(mvm, false);
	}
	}

	if (params->support_tx_backoff) {
	tx_backoff = 0;
	for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
	if (temperature < params->tx_backoff[i].temperature)
	break;
	tx_backoff = params->tx_backoff[i].backoff;
	}
	if (tx_backoff != 0)
	throttle_enable = true;
	if (tt->tx_backoff != tx_backoff)
	iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
	}

	if (!tt->throttle && throttle_enable) {
	IWL_WARN(mvm,
	"Due to high temperature thermal throttling initiated\n");
	tt->throttle = true;
	} else if (tt->throttle && !tt->dynamic_smps && tt->tx_backoff == 0 &&
	temperature <= params->tx_protection_exit) {
	IWL_WARN(mvm,
	"Temperature is back to normal thermal throttling stopped\n");
	tt->throttle = false;
	}
	}

	static const struct iwl_tt_params iwl7000_tt_params = {
	.ct_kill_entry = 118,
	.ct_kill_exit = 96,
	.ct_kill_duration = 5,
	.dynamic_smps_entry = 114,
	.dynamic_smps_exit = 110,
	.tx_protection_entry = 114,
	.tx_protection_exit = 108,
	.tx_backoff = {
	{.temperature = 112, .backoff = 200},
	{.temperature = 113, .backoff = 600},
	{.temperature = 114, .backoff = 1200},
	{.temperature = 115, .backoff = 2000},
	{.temperature = 116, .backoff = 4000},
	{.temperature = 117, .backoff = 10000},
	},
	.support_ct_kill = true,
	.support_dynamic_smps = true,
	.support_tx_protection = true,
	.support_tx_backoff = true,
	};

	static const struct iwl_tt_params iwl7000_high_temp_tt_params = {
	.ct_kill_entry = 118,
	.ct_kill_exit = 96,
	.ct_kill_duration = 5,
	.dynamic_smps_entry = 114,
	.dynamic_smps_exit = 110,
	.tx_protection_entry = 114,
	.tx_protection_exit = 108,
	.tx_backoff = {
	{.temperature = 112, .backoff = 300},
	{.temperature = 113, .backoff = 800},
	{.temperature = 114, .backoff = 1500},
	{.temperature = 115, .backoff = 3000},
	{.temperature = 116, .backoff = 5000},
	{.temperature = 117, .backoff = 10000},
	},
	.support_ct_kill = true,
	.support_dynamic_smps = true,
	.support_tx_protection = true,
	.support_tx_backoff = true,
	};

	void iwl_mvm_tt_initialize(struct iwl_mvm *mvm)
	{
	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;

	IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");

	if (mvm->cfg->high_temp)
	tt->params = &iwl7000_high_temp_tt_params;
	else
	tt->params = &iwl7000_tt_params;

	tt->throttle = false;
	INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);
	}

	void iwl_mvm_tt_exit(struct iwl_mvm *mvm)
	{
	cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
	IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");
	}