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1/******************************************************************************2 *3 * This file is provided under a dual BSD/GPLv2 license. When using or4 * redistributing this file, you may do so under either license.5 *6 * GPL LICENSE SUMMARY7 *8 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.9 *10 * This program is free software; you can redistribute it and/or modify11 * it under the terms of version 2 of the GNU General Public License as12 * published by the Free Software Foundation.13 *14 * This program is distributed in the hope that it will be useful, but15 * WITHOUT ANY WARRANTY; without even the implied warranty of16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU17 * General Public License for more details.18 *19 * You should have received a copy of the GNU General Public License20 * along with this program; if not, write to the Free Software21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,22 * USA23 *24 * The full GNU General Public License is included in this distribution25 * in the file called LICENSE.GPL.26 *27 * Contact Information:28 * Intel Linux Wireless <ilw@linux.intel.com>29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-649730 *31 * BSD LICENSE32 *33 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.34 * All rights reserved.35 *36 * Redistribution and use in source and binary forms, with or without37 * modification, are permitted provided that the following conditions38 * are met:39 *40 * * Redistributions of source code must retain the above copyright41 * notice, this list of conditions and the following disclaimer.42 * * Redistributions in binary form must reproduce the above copyright43 * notice, this list of conditions and the following disclaimer in44 * the documentation and/or other materials provided with the45 * distribution.46 * * Neither the name Intel Corporation nor the names of its47 * contributors may be used to endorse or promote products derived48 * from this software without specific prior written permission.49 *50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.61 *****************************************************************************/62 63#include <linux/slab.h>64#include <net/mac80211.h>65 66#include "common.h"67#include "4965.h"68 69/*****************************************************************************70 * INIT calibrations framework71 *****************************************************************************/72 73struct stats_general_data {74 u32 beacon_silence_rssi_a;75 u32 beacon_silence_rssi_b;76 u32 beacon_silence_rssi_c;77 u32 beacon_energy_a;78 u32 beacon_energy_b;79 u32 beacon_energy_c;80};81 82/*****************************************************************************83 * RUNTIME calibrations framework84 *****************************************************************************/85 86/* "false alarms" are signals that our DSP tries to lock onto,87 * but then determines that they are either noise, or transmissions88 * from a distant wireless network (also "noise", really) that get89 * "stepped on" by stronger transmissions within our own network.90 * This algorithm attempts to set a sensitivity level that is high91 * enough to receive all of our own network traffic, but not so92 * high that our DSP gets too busy trying to lock onto non-network93 * activity/noise. */94static int95il4965_sens_energy_cck(struct il_priv *il, u32 norm_fa, u32 rx_enable_time,96 struct stats_general_data *rx_info)97{98 u32 max_nrg_cck = 0;99 int i = 0;100 u8 max_silence_rssi = 0;101 u32 silence_ref = 0;102 u8 silence_rssi_a = 0;103 u8 silence_rssi_b = 0;104 u8 silence_rssi_c = 0;105 u32 val;106 107 /* "false_alarms" values below are cross-multiplications to assess the108 * numbers of false alarms within the measured period of actual Rx109 * (Rx is off when we're txing), vs the min/max expected false alarms110 * (some should be expected if rx is sensitive enough) in a111 * hypothetical listening period of 200 time units (TU), 204.8 msec:112 *113 * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time114 *115 * */116 u32 false_alarms = norm_fa * 200 * 1024;117 u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;118 u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;119 struct il_sensitivity_data *data = NULL;120 const struct il_sensitivity_ranges *ranges = il->hw_params.sens;121 122 data = &(il->sensitivity_data);123 124 data->nrg_auto_corr_silence_diff = 0;125 126 /* Find max silence rssi among all 3 receivers.127 * This is background noise, which may include transmissions from other128 * networks, measured during silence before our network's beacon */129 silence_rssi_a =130 (u8) ((rx_info->beacon_silence_rssi_a & ALL_BAND_FILTER) >> 8);131 silence_rssi_b =132 (u8) ((rx_info->beacon_silence_rssi_b & ALL_BAND_FILTER) >> 8);133 silence_rssi_c =134 (u8) ((rx_info->beacon_silence_rssi_c & ALL_BAND_FILTER) >> 8);135 136 val = max(silence_rssi_b, silence_rssi_c);137 max_silence_rssi = max(silence_rssi_a, (u8) val);138 139 /* Store silence rssi in 20-beacon history table */140 data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;141 data->nrg_silence_idx++;142 if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)143 data->nrg_silence_idx = 0;144 145 /* Find max silence rssi across 20 beacon history */146 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {147 val = data->nrg_silence_rssi[i];148 silence_ref = max(silence_ref, val);149 }150 D_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n", silence_rssi_a,151 silence_rssi_b, silence_rssi_c, silence_ref);152 153 /* Find max rx energy (min value!) among all 3 receivers,154 * measured during beacon frame.155 * Save it in 10-beacon history table. */156 i = data->nrg_energy_idx;157 val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);158 data->nrg_value[i] = min(rx_info->beacon_energy_a, val);159 160 data->nrg_energy_idx++;161 if (data->nrg_energy_idx >= 10)162 data->nrg_energy_idx = 0;163 164 /* Find min rx energy (max value) across 10 beacon history.165 * This is the minimum signal level that we want to receive well.166 * Add backoff (margin so we don't miss slightly lower energy frames).167 * This establishes an upper bound (min value) for energy threshold. */168 max_nrg_cck = data->nrg_value[0];169 for (i = 1; i < 10; i++)170 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));171 max_nrg_cck += 6;172 173 D_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",174 rx_info->beacon_energy_a, rx_info->beacon_energy_b,175 rx_info->beacon_energy_c, max_nrg_cck - 6);176 177 /* Count number of consecutive beacons with fewer-than-desired178 * false alarms. */179 if (false_alarms < min_false_alarms)180 data->num_in_cck_no_fa++;181 else182 data->num_in_cck_no_fa = 0;183 D_CALIB("consecutive bcns with few false alarms = %u\n",184 data->num_in_cck_no_fa);185 186 /* If we got too many false alarms this time, reduce sensitivity */187 if (false_alarms > max_false_alarms &&188 data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK) {189 D_CALIB("norm FA %u > max FA %u\n", false_alarms,190 max_false_alarms);191 D_CALIB("... reducing sensitivity\n");192 data->nrg_curr_state = IL_FA_TOO_MANY;193 /* Store for "fewer than desired" on later beacon */194 data->nrg_silence_ref = silence_ref;195 196 /* increase energy threshold (reduce nrg value)197 * to decrease sensitivity */198 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;199 /* Else if we got fewer than desired, increase sensitivity */200 } else if (false_alarms < min_false_alarms) {201 data->nrg_curr_state = IL_FA_TOO_FEW;202 203 /* Compare silence level with silence level for most recent204 * healthy number or too many false alarms */205 data->nrg_auto_corr_silence_diff =206 (s32) data->nrg_silence_ref - (s32) silence_ref;207 208 D_CALIB("norm FA %u < min FA %u, silence diff %d\n",209 false_alarms, min_false_alarms,210 data->nrg_auto_corr_silence_diff);211 212 /* Increase value to increase sensitivity, but only if:213 * 1a) previous beacon did *not* have *too many* false alarms214 * 1b) AND there's a significant difference in Rx levels215 * from a previous beacon with too many, or healthy # FAs216 * OR 2) We've seen a lot of beacons (100) with too few217 * false alarms */218 if (data->nrg_prev_state != IL_FA_TOO_MANY &&219 (data->nrg_auto_corr_silence_diff > NRG_DIFF ||220 data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA)) {221 222 D_CALIB("... increasing sensitivity\n");223 /* Increase nrg value to increase sensitivity */224 val = data->nrg_th_cck + NRG_STEP_CCK;225 data->nrg_th_cck = min((u32) ranges->min_nrg_cck, val);226 } else {227 D_CALIB("... but not changing sensitivity\n");228 }229 230 /* Else we got a healthy number of false alarms, keep status quo */231 } else {232 D_CALIB(" FA in safe zone\n");233 data->nrg_curr_state = IL_FA_GOOD_RANGE;234 235 /* Store for use in "fewer than desired" with later beacon */236 data->nrg_silence_ref = silence_ref;237 238 /* If previous beacon had too many false alarms,239 * give it some extra margin by reducing sensitivity again240 * (but don't go below measured energy of desired Rx) */241 if (IL_FA_TOO_MANY == data->nrg_prev_state) {242 D_CALIB("... increasing margin\n");243 if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))244 data->nrg_th_cck -= NRG_MARGIN;245 else246 data->nrg_th_cck = max_nrg_cck;247 }248 }249 250 /* Make sure the energy threshold does not go above the measured251 * energy of the desired Rx signals (reduced by backoff margin),252 * or else we might start missing Rx frames.253 * Lower value is higher energy, so we use max()!254 */255 data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);256 D_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck);257 258 data->nrg_prev_state = data->nrg_curr_state;259 260 /* Auto-correlation CCK algorithm */261 if (false_alarms > min_false_alarms) {262 263 /* increase auto_corr values to decrease sensitivity264 * so the DSP won't be disturbed by the noise265 */266 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)267 data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;268 else {269 val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;270 data->auto_corr_cck =271 min((u32) ranges->auto_corr_max_cck, val);272 }273 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;274 data->auto_corr_cck_mrc =275 min((u32) ranges->auto_corr_max_cck_mrc, val);276 } else if (false_alarms < min_false_alarms &&277 (data->nrg_auto_corr_silence_diff > NRG_DIFF ||278 data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA)) {279 280 /* Decrease auto_corr values to increase sensitivity */281 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;282 data->auto_corr_cck = max((u32) ranges->auto_corr_min_cck, val);283 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;284 data->auto_corr_cck_mrc =285 max((u32) ranges->auto_corr_min_cck_mrc, val);286 }287 288 return 0;289}290 291static int292il4965_sens_auto_corr_ofdm(struct il_priv *il, u32 norm_fa, u32 rx_enable_time)293{294 u32 val;295 u32 false_alarms = norm_fa * 200 * 1024;296 u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;297 u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;298 struct il_sensitivity_data *data = NULL;299 const struct il_sensitivity_ranges *ranges = il->hw_params.sens;300 301 data = &(il->sensitivity_data);302 303 /* If we got too many false alarms this time, reduce sensitivity */304 if (false_alarms > max_false_alarms) {305 306 D_CALIB("norm FA %u > max FA %u)\n", false_alarms,307 max_false_alarms);308 309 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;310 data->auto_corr_ofdm =311 min((u32) ranges->auto_corr_max_ofdm, val);312 313 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;314 data->auto_corr_ofdm_mrc =315 min((u32) ranges->auto_corr_max_ofdm_mrc, val);316 317 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;318 data->auto_corr_ofdm_x1 =319 min((u32) ranges->auto_corr_max_ofdm_x1, val);320 321 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;322 data->auto_corr_ofdm_mrc_x1 =323 min((u32) ranges->auto_corr_max_ofdm_mrc_x1, val);324 }325 326 /* Else if we got fewer than desired, increase sensitivity */327 else if (false_alarms < min_false_alarms) {328 329 D_CALIB("norm FA %u < min FA %u\n", false_alarms,330 min_false_alarms);331 332 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;333 data->auto_corr_ofdm =334 max((u32) ranges->auto_corr_min_ofdm, val);335 336 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;337 data->auto_corr_ofdm_mrc =338 max((u32) ranges->auto_corr_min_ofdm_mrc, val);339 340 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;341 data->auto_corr_ofdm_x1 =342 max((u32) ranges->auto_corr_min_ofdm_x1, val);343 344 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;345 data->auto_corr_ofdm_mrc_x1 =346 max((u32) ranges->auto_corr_min_ofdm_mrc_x1, val);347 } else {348 D_CALIB("min FA %u < norm FA %u < max FA %u OK\n",349 min_false_alarms, false_alarms, max_false_alarms);350 }351 return 0;352}353 354static void355il4965_prepare_legacy_sensitivity_tbl(struct il_priv *il,356 struct il_sensitivity_data *data,357 __le16 *tbl)358{359 tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_IDX] =360 cpu_to_le16((u16) data->auto_corr_ofdm);361 tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_IDX] =362 cpu_to_le16((u16) data->auto_corr_ofdm_mrc);363 tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_IDX] =364 cpu_to_le16((u16) data->auto_corr_ofdm_x1);365 tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_IDX] =366 cpu_to_le16((u16) data->auto_corr_ofdm_mrc_x1);367 368 tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_IDX] =369 cpu_to_le16((u16) data->auto_corr_cck);370 tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_IDX] =371 cpu_to_le16((u16) data->auto_corr_cck_mrc);372 373 tbl[HD_MIN_ENERGY_CCK_DET_IDX] = cpu_to_le16((u16) data->nrg_th_cck);374 tbl[HD_MIN_ENERGY_OFDM_DET_IDX] = cpu_to_le16((u16) data->nrg_th_ofdm);375 376 tbl[HD_BARKER_CORR_TH_ADD_MIN_IDX] =377 cpu_to_le16(data->barker_corr_th_min);378 tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_IDX] =379 cpu_to_le16(data->barker_corr_th_min_mrc);380 tbl[HD_OFDM_ENERGY_TH_IN_IDX] = cpu_to_le16(data->nrg_th_cca);381 382 D_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",383 data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,384 data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,385 data->nrg_th_ofdm);386 387 D_CALIB("cck: ac %u mrc %u thresh %u\n", data->auto_corr_cck,388 data->auto_corr_cck_mrc, data->nrg_th_cck);389}390 391/* Prepare a C_SENSITIVITY, send to uCode if values have changed */392static int393il4965_sensitivity_write(struct il_priv *il)394{395 struct il_sensitivity_cmd cmd;396 struct il_sensitivity_data *data = NULL;397 struct il_host_cmd cmd_out = {398 .id = C_SENSITIVITY,399 .len = sizeof(struct il_sensitivity_cmd),400 .flags = CMD_ASYNC,401 .data = &cmd,402 };403 404 data = &(il->sensitivity_data);405 406 memset(&cmd, 0, sizeof(cmd));407 408 il4965_prepare_legacy_sensitivity_tbl(il, data, &cmd.table[0]);409 410 /* Update uCode's "work" table, and copy it to DSP */411 cmd.control = C_SENSITIVITY_CONTROL_WORK_TBL;412 413 /* Don't send command to uCode if nothing has changed */414 if (!memcmp415 (&cmd.table[0], &(il->sensitivity_tbl[0]),416 sizeof(u16) * HD_TBL_SIZE)) {417 D_CALIB("No change in C_SENSITIVITY\n");418 return 0;419 }420 421 /* Copy table for comparison next time */422 memcpy(&(il->sensitivity_tbl[0]), &(cmd.table[0]),423 sizeof(u16) * HD_TBL_SIZE);424 425 return il_send_cmd(il, &cmd_out);426}427 428void429il4965_init_sensitivity(struct il_priv *il)430{431 int ret = 0;432 int i;433 struct il_sensitivity_data *data = NULL;434 const struct il_sensitivity_ranges *ranges = il->hw_params.sens;435 436 if (il->disable_sens_cal)437 return;438 439 D_CALIB("Start il4965_init_sensitivity\n");440 441 /* Clear driver's sensitivity algo data */442 data = &(il->sensitivity_data);443 444 if (ranges == NULL)445 return;446 447 memset(data, 0, sizeof(struct il_sensitivity_data));448 449 data->num_in_cck_no_fa = 0;450 data->nrg_curr_state = IL_FA_TOO_MANY;451 data->nrg_prev_state = IL_FA_TOO_MANY;452 data->nrg_silence_ref = 0;453 data->nrg_silence_idx = 0;454 data->nrg_energy_idx = 0;455 456 for (i = 0; i < 10; i++)457 data->nrg_value[i] = 0;458 459 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)460 data->nrg_silence_rssi[i] = 0;461 462 data->auto_corr_ofdm = ranges->auto_corr_min_ofdm;463 data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;464 data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1;465 data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;466 data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;467 data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;468 data->nrg_th_cck = ranges->nrg_th_cck;469 data->nrg_th_ofdm = ranges->nrg_th_ofdm;470 data->barker_corr_th_min = ranges->barker_corr_th_min;471 data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;472 data->nrg_th_cca = ranges->nrg_th_cca;473 474 data->last_bad_plcp_cnt_ofdm = 0;475 data->last_fa_cnt_ofdm = 0;476 data->last_bad_plcp_cnt_cck = 0;477 data->last_fa_cnt_cck = 0;478 479 ret |= il4965_sensitivity_write(il);480 D_CALIB("<<return 0x%X\n", ret);481}482 483void484il4965_sensitivity_calibration(struct il_priv *il, void *resp)485{486 u32 rx_enable_time;487 u32 fa_cck;488 u32 fa_ofdm;489 u32 bad_plcp_cck;490 u32 bad_plcp_ofdm;491 u32 norm_fa_ofdm;492 u32 norm_fa_cck;493 struct il_sensitivity_data *data = NULL;494 struct stats_rx_non_phy *rx_info;495 struct stats_rx_phy *ofdm, *cck;496 unsigned long flags;497 struct stats_general_data statis;498 499 if (il->disable_sens_cal)500 return;501 502 data = &(il->sensitivity_data);503 504 if (!il_is_any_associated(il)) {505 D_CALIB("<< - not associated\n");506 return;507 }508 509 spin_lock_irqsave(&il->lock, flags);510 511 rx_info = &(((struct il_notif_stats *)resp)->rx.general);512 ofdm = &(((struct il_notif_stats *)resp)->rx.ofdm);513 cck = &(((struct il_notif_stats *)resp)->rx.cck);514 515 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {516 D_CALIB("<< invalid data.\n");517 spin_unlock_irqrestore(&il->lock, flags);518 return;519 }520 521 /* Extract Statistics: */522 rx_enable_time = le32_to_cpu(rx_info->channel_load);523 fa_cck = le32_to_cpu(cck->false_alarm_cnt);524 fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);525 bad_plcp_cck = le32_to_cpu(cck->plcp_err);526 bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);527 528 statis.beacon_silence_rssi_a =529 le32_to_cpu(rx_info->beacon_silence_rssi_a);530 statis.beacon_silence_rssi_b =531 le32_to_cpu(rx_info->beacon_silence_rssi_b);532 statis.beacon_silence_rssi_c =533 le32_to_cpu(rx_info->beacon_silence_rssi_c);534 statis.beacon_energy_a = le32_to_cpu(rx_info->beacon_energy_a);535 statis.beacon_energy_b = le32_to_cpu(rx_info->beacon_energy_b);536 statis.beacon_energy_c = le32_to_cpu(rx_info->beacon_energy_c);537 538 spin_unlock_irqrestore(&il->lock, flags);539 540 D_CALIB("rx_enable_time = %u usecs\n", rx_enable_time);541 542 if (!rx_enable_time) {543 D_CALIB("<< RX Enable Time == 0!\n");544 return;545 }546 547 /* These stats increase monotonically, and do not reset548 * at each beacon. Calculate difference from last value, or just549 * use the new stats value if it has reset or wrapped around. */550 if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)551 data->last_bad_plcp_cnt_cck = bad_plcp_cck;552 else {553 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;554 data->last_bad_plcp_cnt_cck += bad_plcp_cck;555 }556 557 if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)558 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;559 else {560 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;561 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;562 }563 564 if (data->last_fa_cnt_ofdm > fa_ofdm)565 data->last_fa_cnt_ofdm = fa_ofdm;566 else {567 fa_ofdm -= data->last_fa_cnt_ofdm;568 data->last_fa_cnt_ofdm += fa_ofdm;569 }570 571 if (data->last_fa_cnt_cck > fa_cck)572 data->last_fa_cnt_cck = fa_cck;573 else {574 fa_cck -= data->last_fa_cnt_cck;575 data->last_fa_cnt_cck += fa_cck;576 }577 578 /* Total aborted signal locks */579 norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;580 norm_fa_cck = fa_cck + bad_plcp_cck;581 582 D_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck,583 bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);584 585 il4965_sens_auto_corr_ofdm(il, norm_fa_ofdm, rx_enable_time);586 il4965_sens_energy_cck(il, norm_fa_cck, rx_enable_time, &statis);587 588 il4965_sensitivity_write(il);589}590 591static inline u8592il4965_find_first_chain(u8 mask)593{594 if (mask & ANT_A)595 return CHAIN_A;596 if (mask & ANT_B)597 return CHAIN_B;598 return CHAIN_C;599}600 601/*602 * Run disconnected antenna algorithm to find out which antennas are603 * disconnected.604 */605static void606il4965_find_disconn_antenna(struct il_priv *il, u32 * average_sig,607 struct il_chain_noise_data *data)608{609 u32 active_chains = 0;610 u32 max_average_sig;611 u16 max_average_sig_antenna_i;612 u8 num_tx_chains;613 u8 first_chain;614 u16 i = 0;615 616 average_sig[0] =617 data->chain_signal_a /618 il->cfg->chain_noise_num_beacons;619 average_sig[1] =620 data->chain_signal_b /621 il->cfg->chain_noise_num_beacons;622 average_sig[2] =623 data->chain_signal_c /624 il->cfg->chain_noise_num_beacons;625 626 if (average_sig[0] >= average_sig[1]) {627 max_average_sig = average_sig[0];628 max_average_sig_antenna_i = 0;629 active_chains = (1 << max_average_sig_antenna_i);630 } else {631 max_average_sig = average_sig[1];632 max_average_sig_antenna_i = 1;633 active_chains = (1 << max_average_sig_antenna_i);634 }635 636 if (average_sig[2] >= max_average_sig) {637 max_average_sig = average_sig[2];638 max_average_sig_antenna_i = 2;639 active_chains = (1 << max_average_sig_antenna_i);640 }641 642 D_CALIB("average_sig: a %d b %d c %d\n", average_sig[0], average_sig[1],643 average_sig[2]);644 D_CALIB("max_average_sig = %d, antenna %d\n", max_average_sig,645 max_average_sig_antenna_i);646 647 /* Compare signal strengths for all 3 receivers. */648 for (i = 0; i < NUM_RX_CHAINS; i++) {649 if (i != max_average_sig_antenna_i) {650 s32 rssi_delta = (max_average_sig - average_sig[i]);651 652 /* If signal is very weak, compared with653 * strongest, mark it as disconnected. */654 if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)655 data->disconn_array[i] = 1;656 else657 active_chains |= (1 << i);658 D_CALIB("i = %d rssiDelta = %d "659 "disconn_array[i] = %d\n", i, rssi_delta,660 data->disconn_array[i]);661 }662 }663 664 /*665 * The above algorithm sometimes fails when the ucode666 * reports 0 for all chains. It's not clear why that667 * happens to start with, but it is then causing trouble668 * because this can make us enable more chains than the669 * hardware really has.670 *671 * To be safe, simply mask out any chains that we know672 * are not on the device.673 */674 active_chains &= il->hw_params.valid_rx_ant;675 676 num_tx_chains = 0;677 for (i = 0; i < NUM_RX_CHAINS; i++) {678 /* loops on all the bits of679 * il->hw_setting.valid_tx_ant */680 u8 ant_msk = (1 << i);681 if (!(il->hw_params.valid_tx_ant & ant_msk))682 continue;683 684 num_tx_chains++;685 if (data->disconn_array[i] == 0)686 /* there is a Tx antenna connected */687 break;688 if (num_tx_chains == il->hw_params.tx_chains_num &&689 data->disconn_array[i]) {690 /*691 * If all chains are disconnected692 * connect the first valid tx chain693 */694 first_chain =695 il4965_find_first_chain(il->cfg->valid_tx_ant);696 data->disconn_array[first_chain] = 0;697 active_chains |= BIT(first_chain);698 D_CALIB("All Tx chains are disconnected"699 "- declare %d as connected\n", first_chain);700 break;701 }702 }703 704 if (active_chains != il->hw_params.valid_rx_ant &&705 active_chains != il->chain_noise_data.active_chains)706 D_CALIB("Detected that not all antennas are connected! "707 "Connected: %#x, valid: %#x.\n", active_chains,708 il->hw_params.valid_rx_ant);709 710 /* Save for use within RXON, TX, SCAN commands, etc. */711 data->active_chains = active_chains;712 D_CALIB("active_chains (bitwise) = 0x%x\n", active_chains);713}714 715static void716il4965_gain_computation(struct il_priv *il, u32 * average_noise,717 u16 min_average_noise_antenna_i, u32 min_average_noise,718 u8 default_chain)719{720 int i, ret;721 struct il_chain_noise_data *data = &il->chain_noise_data;722 723 data->delta_gain_code[min_average_noise_antenna_i] = 0;724 725 for (i = default_chain; i < NUM_RX_CHAINS; i++) {726 s32 delta_g = 0;727 728 if (!data->disconn_array[i] &&729 data->delta_gain_code[i] ==730 CHAIN_NOISE_DELTA_GAIN_INIT_VAL) {731 delta_g = average_noise[i] - min_average_noise;732 data->delta_gain_code[i] = (u8) ((delta_g * 10) / 15);733 data->delta_gain_code[i] =734 min(data->delta_gain_code[i],735 (u8) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);736 737 data->delta_gain_code[i] =738 (data->delta_gain_code[i] | (1 << 2));739 } else {740 data->delta_gain_code[i] = 0;741 }742 }743 D_CALIB("delta_gain_codes: a %d b %d c %d\n", data->delta_gain_code[0],744 data->delta_gain_code[1], data->delta_gain_code[2]);745 746 /* Differential gain gets sent to uCode only once */747 if (!data->radio_write) {748 struct il_calib_diff_gain_cmd cmd;749 data->radio_write = 1;750 751 memset(&cmd, 0, sizeof(cmd));752 cmd.hdr.op_code = IL_PHY_CALIBRATE_DIFF_GAIN_CMD;753 cmd.diff_gain_a = data->delta_gain_code[0];754 cmd.diff_gain_b = data->delta_gain_code[1];755 cmd.diff_gain_c = data->delta_gain_code[2];756 ret = il_send_cmd_pdu(il, C_PHY_CALIBRATION, sizeof(cmd), &cmd);757 if (ret)758 D_CALIB("fail sending cmd " "C_PHY_CALIBRATION\n");759 760 /* TODO we might want recalculate761 * rx_chain in rxon cmd */762 763 /* Mark so we run this algo only once! */764 data->state = IL_CHAIN_NOISE_CALIBRATED;765 }766}767 768/*769 * Accumulate 16 beacons of signal and noise stats for each of770 * 3 receivers/antennas/rx-chains, then figure out:771 * 1) Which antennas are connected.772 * 2) Differential rx gain settings to balance the 3 receivers.773 */774void775il4965_chain_noise_calibration(struct il_priv *il, void *stat_resp)776{777 struct il_chain_noise_data *data = NULL;778 779 u32 chain_noise_a;780 u32 chain_noise_b;781 u32 chain_noise_c;782 u32 chain_sig_a;783 u32 chain_sig_b;784 u32 chain_sig_c;785 u32 average_sig[NUM_RX_CHAINS] = { INITIALIZATION_VALUE };786 u32 average_noise[NUM_RX_CHAINS] = { INITIALIZATION_VALUE };787 u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;788 u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;789 u16 i = 0;790 u16 rxon_chnum = INITIALIZATION_VALUE;791 u16 stat_chnum = INITIALIZATION_VALUE;792 u8 rxon_band24;793 u8 stat_band24;794 unsigned long flags;795 struct stats_rx_non_phy *rx_info;796 797 if (il->disable_chain_noise_cal)798 return;799 800 data = &(il->chain_noise_data);801 802 /*803 * Accumulate just the first "chain_noise_num_beacons" after804 * the first association, then we're done forever.805 */806 if (data->state != IL_CHAIN_NOISE_ACCUMULATE) {807 if (data->state == IL_CHAIN_NOISE_ALIVE)808 D_CALIB("Wait for noise calib reset\n");809 return;810 }811 812 spin_lock_irqsave(&il->lock, flags);813 814 rx_info = &(((struct il_notif_stats *)stat_resp)->rx.general);815 816 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {817 D_CALIB(" << Interference data unavailable\n");818 spin_unlock_irqrestore(&il->lock, flags);819 return;820 }821 822 rxon_band24 = !!(il->staging.flags & RXON_FLG_BAND_24G_MSK);823 rxon_chnum = le16_to_cpu(il->staging.channel);824 825 stat_band24 =826 !!(((struct il_notif_stats *)stat_resp)->827 flag & STATS_REPLY_FLG_BAND_24G_MSK);828 stat_chnum =829 le32_to_cpu(((struct il_notif_stats *)stat_resp)->flag) >> 16;830 831 /* Make sure we accumulate data for just the associated channel832 * (even if scanning). */833 if (rxon_chnum != stat_chnum || rxon_band24 != stat_band24) {834 D_CALIB("Stats not from chan=%d, band24=%d\n", rxon_chnum,835 rxon_band24);836 spin_unlock_irqrestore(&il->lock, flags);837 return;838 }839 840 /*841 * Accumulate beacon stats values across842 * "chain_noise_num_beacons"843 */844 chain_noise_a =845 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;846 chain_noise_b =847 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;848 chain_noise_c =849 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;850 851 chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;852 chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;853 chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;854 855 spin_unlock_irqrestore(&il->lock, flags);856 857 data->beacon_count++;858 859 data->chain_noise_a = (chain_noise_a + data->chain_noise_a);860 data->chain_noise_b = (chain_noise_b + data->chain_noise_b);861 data->chain_noise_c = (chain_noise_c + data->chain_noise_c);862 863 data->chain_signal_a = (chain_sig_a + data->chain_signal_a);864 data->chain_signal_b = (chain_sig_b + data->chain_signal_b);865 data->chain_signal_c = (chain_sig_c + data->chain_signal_c);866 867 D_CALIB("chan=%d, band24=%d, beacon=%d\n", rxon_chnum, rxon_band24,868 data->beacon_count);869 D_CALIB("chain_sig: a %d b %d c %d\n", chain_sig_a, chain_sig_b,870 chain_sig_c);871 D_CALIB("chain_noise: a %d b %d c %d\n", chain_noise_a, chain_noise_b,872 chain_noise_c);873 874 /* If this is the "chain_noise_num_beacons", determine:875 * 1) Disconnected antennas (using signal strengths)876 * 2) Differential gain (using silence noise) to balance receivers */877 if (data->beacon_count != il->cfg->chain_noise_num_beacons)878 return;879 880 /* Analyze signal for disconnected antenna */881 il4965_find_disconn_antenna(il, average_sig, data);882 883 /* Analyze noise for rx balance */884 average_noise[0] =885 data->chain_noise_a / il->cfg->chain_noise_num_beacons;886 average_noise[1] =887 data->chain_noise_b / il->cfg->chain_noise_num_beacons;888 average_noise[2] =889 data->chain_noise_c / il->cfg->chain_noise_num_beacons;890 891 for (i = 0; i < NUM_RX_CHAINS; i++) {892 if (!data->disconn_array[i] &&893 average_noise[i] <= min_average_noise) {894 /* This means that chain i is active and has895 * lower noise values so far: */896 min_average_noise = average_noise[i];897 min_average_noise_antenna_i = i;898 }899 }900 901 D_CALIB("average_noise: a %d b %d c %d\n", average_noise[0],902 average_noise[1], average_noise[2]);903 904 D_CALIB("min_average_noise = %d, antenna %d\n", min_average_noise,905 min_average_noise_antenna_i);906 907 il4965_gain_computation(il, average_noise, min_average_noise_antenna_i,908 min_average_noise,909 il4965_find_first_chain(il->cfg->valid_rx_ant));910 911 /* Some power changes may have been made during the calibration.912 * Update and commit the RXON913 */914 if (il->ops->update_chain_flags)915 il->ops->update_chain_flags(il);916 917 data->state = IL_CHAIN_NOISE_DONE;918 il_power_update_mode(il, false);919}920 921void922il4965_reset_run_time_calib(struct il_priv *il)923{924 int i;925 memset(&(il->sensitivity_data), 0, sizeof(struct il_sensitivity_data));926 memset(&(il->chain_noise_data), 0, sizeof(struct il_chain_noise_data));927 for (i = 0; i < NUM_RX_CHAINS; i++)928 il->chain_noise_data.delta_gain_code[i] =929 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;930 931 /* Ask for stats now, the uCode will send notification932 * periodically after association */933 il_send_stats_request(il, CMD_ASYNC, true);934}935