diff options
Diffstat (limited to 'drivers/net/wireless/intel/iwlegacy/4965-calib.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlegacy/4965-calib.c | 934 |
1 files changed, 934 insertions, 0 deletions
diff --git a/drivers/net/wireless/intel/iwlegacy/4965-calib.c b/drivers/net/wireless/intel/iwlegacy/4965-calib.c new file mode 100644 index 000000000..2f97cbd42 --- /dev/null +++ b/drivers/net/wireless/intel/iwlegacy/4965-calib.c @@ -0,0 +1,934 @@ +/****************************************************************************** + * + * 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 - 2011 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 - 2011 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/slab.h> +#include <net/mac80211.h> + +#include "common.h" +#include "4965.h" + +/***************************************************************************** + * INIT calibrations framework + *****************************************************************************/ + +struct stats_general_data { + u32 beacon_silence_rssi_a; + u32 beacon_silence_rssi_b; + u32 beacon_silence_rssi_c; + u32 beacon_energy_a; + u32 beacon_energy_b; + u32 beacon_energy_c; +}; + +/***************************************************************************** + * RUNTIME calibrations framework + *****************************************************************************/ + +/* "false alarms" are signals that our DSP tries to lock onto, + * but then determines that they are either noise, or transmissions + * from a distant wireless network (also "noise", really) that get + * "stepped on" by stronger transmissions within our own network. + * This algorithm attempts to set a sensitivity level that is high + * enough to receive all of our own network traffic, but not so + * high that our DSP gets too busy trying to lock onto non-network + * activity/noise. */ +static int +il4965_sens_energy_cck(struct il_priv *il, u32 norm_fa, u32 rx_enable_time, + struct stats_general_data *rx_info) +{ + u32 max_nrg_cck = 0; + int i = 0; + u8 max_silence_rssi = 0; + u32 silence_ref = 0; + u8 silence_rssi_a = 0; + u8 silence_rssi_b = 0; + u8 silence_rssi_c = 0; + u32 val; + + /* "false_alarms" values below are cross-multiplications to assess the + * numbers of false alarms within the measured period of actual Rx + * (Rx is off when we're txing), vs the min/max expected false alarms + * (some should be expected if rx is sensitive enough) in a + * hypothetical listening period of 200 time units (TU), 204.8 msec: + * + * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time + * + * */ + u32 false_alarms = norm_fa * 200 * 1024; + u32 max_false_alarms = MAX_FA_CCK * rx_enable_time; + u32 min_false_alarms = MIN_FA_CCK * rx_enable_time; + struct il_sensitivity_data *data = NULL; + const struct il_sensitivity_ranges *ranges = il->hw_params.sens; + + data = &(il->sensitivity_data); + + data->nrg_auto_corr_silence_diff = 0; + + /* Find max silence rssi among all 3 receivers. + * This is background noise, which may include transmissions from other + * networks, measured during silence before our network's beacon */ + silence_rssi_a = + (u8) ((rx_info->beacon_silence_rssi_a & ALL_BAND_FILTER) >> 8); + silence_rssi_b = + (u8) ((rx_info->beacon_silence_rssi_b & ALL_BAND_FILTER) >> 8); + silence_rssi_c = + (u8) ((rx_info->beacon_silence_rssi_c & ALL_BAND_FILTER) >> 8); + + val = max(silence_rssi_b, silence_rssi_c); + max_silence_rssi = max(silence_rssi_a, (u8) val); + + /* Store silence rssi in 20-beacon history table */ + data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi; + data->nrg_silence_idx++; + if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L) + data->nrg_silence_idx = 0; + + /* Find max silence rssi across 20 beacon history */ + for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) { + val = data->nrg_silence_rssi[i]; + silence_ref = max(silence_ref, val); + } + D_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n", silence_rssi_a, + silence_rssi_b, silence_rssi_c, silence_ref); + + /* Find max rx energy (min value!) among all 3 receivers, + * measured during beacon frame. + * Save it in 10-beacon history table. */ + i = data->nrg_energy_idx; + val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c); + data->nrg_value[i] = min(rx_info->beacon_energy_a, val); + + data->nrg_energy_idx++; + if (data->nrg_energy_idx >= 10) + data->nrg_energy_idx = 0; + + /* Find min rx energy (max value) across 10 beacon history. + * This is the minimum signal level that we want to receive well. + * Add backoff (margin so we don't miss slightly lower energy frames). + * This establishes an upper bound (min value) for energy threshold. */ + max_nrg_cck = data->nrg_value[0]; + for (i = 1; i < 10; i++) + max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i])); + max_nrg_cck += 6; + + D_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n", + rx_info->beacon_energy_a, rx_info->beacon_energy_b, + rx_info->beacon_energy_c, max_nrg_cck - 6); + + /* Count number of consecutive beacons with fewer-than-desired + * false alarms. */ + if (false_alarms < min_false_alarms) + data->num_in_cck_no_fa++; + else + data->num_in_cck_no_fa = 0; + D_CALIB("consecutive bcns with few false alarms = %u\n", + data->num_in_cck_no_fa); + + /* If we got too many false alarms this time, reduce sensitivity */ + if (false_alarms > max_false_alarms && + data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK) { + D_CALIB("norm FA %u > max FA %u\n", false_alarms, + max_false_alarms); + D_CALIB("... reducing sensitivity\n"); + data->nrg_curr_state = IL_FA_TOO_MANY; + /* Store for "fewer than desired" on later beacon */ + data->nrg_silence_ref = silence_ref; + + /* increase energy threshold (reduce nrg value) + * to decrease sensitivity */ + data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK; + /* Else if we got fewer than desired, increase sensitivity */ + } else if (false_alarms < min_false_alarms) { + data->nrg_curr_state = IL_FA_TOO_FEW; + + /* Compare silence level with silence level for most recent + * healthy number or too many false alarms */ + data->nrg_auto_corr_silence_diff = + (s32) data->nrg_silence_ref - (s32) silence_ref; + + D_CALIB("norm FA %u < min FA %u, silence diff %d\n", + false_alarms, min_false_alarms, + data->nrg_auto_corr_silence_diff); + + /* Increase value to increase sensitivity, but only if: + * 1a) previous beacon did *not* have *too many* false alarms + * 1b) AND there's a significant difference in Rx levels + * from a previous beacon with too many, or healthy # FAs + * OR 2) We've seen a lot of beacons (100) with too few + * false alarms */ + if (data->nrg_prev_state != IL_FA_TOO_MANY && + (data->nrg_auto_corr_silence_diff > NRG_DIFF || + data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA)) { + + D_CALIB("... increasing sensitivity\n"); + /* Increase nrg value to increase sensitivity */ + val = data->nrg_th_cck + NRG_STEP_CCK; + data->nrg_th_cck = min((u32) ranges->min_nrg_cck, val); + } else { + D_CALIB("... but not changing sensitivity\n"); + } + + /* Else we got a healthy number of false alarms, keep status quo */ + } else { + D_CALIB(" FA in safe zone\n"); + data->nrg_curr_state = IL_FA_GOOD_RANGE; + + /* Store for use in "fewer than desired" with later beacon */ + data->nrg_silence_ref = silence_ref; + + /* If previous beacon had too many false alarms, + * give it some extra margin by reducing sensitivity again + * (but don't go below measured energy of desired Rx) */ + if (IL_FA_TOO_MANY == data->nrg_prev_state) { + D_CALIB("... increasing margin\n"); + if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN)) + data->nrg_th_cck -= NRG_MARGIN; + else + data->nrg_th_cck = max_nrg_cck; + } + } + + /* Make sure the energy threshold does not go above the measured + * energy of the desired Rx signals (reduced by backoff margin), + * or else we might start missing Rx frames. + * Lower value is higher energy, so we use max()! + */ + data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck); + D_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck); + + data->nrg_prev_state = data->nrg_curr_state; + + /* Auto-correlation CCK algorithm */ + if (false_alarms > min_false_alarms) { + + /* increase auto_corr values to decrease sensitivity + * so the DSP won't be disturbed by the noise + */ + if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK) + data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1; + else { + val = data->auto_corr_cck + AUTO_CORR_STEP_CCK; + data->auto_corr_cck = + min((u32) ranges->auto_corr_max_cck, val); + } + val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK; + data->auto_corr_cck_mrc = + min((u32) ranges->auto_corr_max_cck_mrc, val); + } else if (false_alarms < min_false_alarms && + (data->nrg_auto_corr_silence_diff > NRG_DIFF || + data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA)) { + + /* Decrease auto_corr values to increase sensitivity */ + val = data->auto_corr_cck - AUTO_CORR_STEP_CCK; + data->auto_corr_cck = max((u32) ranges->auto_corr_min_cck, val); + val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK; + data->auto_corr_cck_mrc = + max((u32) ranges->auto_corr_min_cck_mrc, val); + } + + return 0; +} + +static int +il4965_sens_auto_corr_ofdm(struct il_priv *il, u32 norm_fa, u32 rx_enable_time) +{ + u32 val; + u32 false_alarms = norm_fa * 200 * 1024; + u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time; + u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time; + struct il_sensitivity_data *data = NULL; + const struct il_sensitivity_ranges *ranges = il->hw_params.sens; + + data = &(il->sensitivity_data); + + /* If we got too many false alarms this time, reduce sensitivity */ + if (false_alarms > max_false_alarms) { + + D_CALIB("norm FA %u > max FA %u)\n", false_alarms, + max_false_alarms); + + val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM; + data->auto_corr_ofdm = + min((u32) ranges->auto_corr_max_ofdm, val); + + val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM; + data->auto_corr_ofdm_mrc = + min((u32) ranges->auto_corr_max_ofdm_mrc, val); + + val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM; + data->auto_corr_ofdm_x1 = + min((u32) ranges->auto_corr_max_ofdm_x1, val); + + val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM; + data->auto_corr_ofdm_mrc_x1 = + min((u32) ranges->auto_corr_max_ofdm_mrc_x1, val); + } + + /* Else if we got fewer than desired, increase sensitivity */ + else if (false_alarms < min_false_alarms) { + + D_CALIB("norm FA %u < min FA %u\n", false_alarms, + min_false_alarms); + + val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM; + data->auto_corr_ofdm = + max((u32) ranges->auto_corr_min_ofdm, val); + + val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM; + data->auto_corr_ofdm_mrc = + max((u32) ranges->auto_corr_min_ofdm_mrc, val); + + val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM; + data->auto_corr_ofdm_x1 = + max((u32) ranges->auto_corr_min_ofdm_x1, val); + + val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM; + data->auto_corr_ofdm_mrc_x1 = + max((u32) ranges->auto_corr_min_ofdm_mrc_x1, val); + } else { + D_CALIB("min FA %u < norm FA %u < max FA %u OK\n", + min_false_alarms, false_alarms, max_false_alarms); + } + return 0; +} + +static void +il4965_prepare_legacy_sensitivity_tbl(struct il_priv *il, + struct il_sensitivity_data *data, + __le16 *tbl) +{ + tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_IDX] = + cpu_to_le16((u16) data->auto_corr_ofdm); + tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_IDX] = + cpu_to_le16((u16) data->auto_corr_ofdm_mrc); + tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_IDX] = + cpu_to_le16((u16) data->auto_corr_ofdm_x1); + tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_IDX] = + cpu_to_le16((u16) data->auto_corr_ofdm_mrc_x1); + + tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_IDX] = + cpu_to_le16((u16) data->auto_corr_cck); + tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_IDX] = + cpu_to_le16((u16) data->auto_corr_cck_mrc); + + tbl[HD_MIN_ENERGY_CCK_DET_IDX] = cpu_to_le16((u16) data->nrg_th_cck); + tbl[HD_MIN_ENERGY_OFDM_DET_IDX] = cpu_to_le16((u16) data->nrg_th_ofdm); + + tbl[HD_BARKER_CORR_TH_ADD_MIN_IDX] = + cpu_to_le16(data->barker_corr_th_min); + tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_IDX] = + cpu_to_le16(data->barker_corr_th_min_mrc); + tbl[HD_OFDM_ENERGY_TH_IN_IDX] = cpu_to_le16(data->nrg_th_cca); + + D_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n", + data->auto_corr_ofdm, data->auto_corr_ofdm_mrc, + data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1, + data->nrg_th_ofdm); + + D_CALIB("cck: ac %u mrc %u thresh %u\n", data->auto_corr_cck, + data->auto_corr_cck_mrc, data->nrg_th_cck); +} + +/* Prepare a C_SENSITIVITY, send to uCode if values have changed */ +static int +il4965_sensitivity_write(struct il_priv *il) +{ + struct il_sensitivity_cmd cmd; + struct il_sensitivity_data *data = NULL; + struct il_host_cmd cmd_out = { + .id = C_SENSITIVITY, + .len = sizeof(struct il_sensitivity_cmd), + .flags = CMD_ASYNC, + .data = &cmd, + }; + + data = &(il->sensitivity_data); + + memset(&cmd, 0, sizeof(cmd)); + + il4965_prepare_legacy_sensitivity_tbl(il, data, &cmd.table[0]); + + /* Update uCode's "work" table, and copy it to DSP */ + cmd.control = C_SENSITIVITY_CONTROL_WORK_TBL; + + /* Don't send command to uCode if nothing has changed */ + if (!memcmp + (&cmd.table[0], &(il->sensitivity_tbl[0]), + sizeof(u16) * HD_TBL_SIZE)) { + D_CALIB("No change in C_SENSITIVITY\n"); + return 0; + } + + /* Copy table for comparison next time */ + memcpy(&(il->sensitivity_tbl[0]), &(cmd.table[0]), + sizeof(u16) * HD_TBL_SIZE); + + return il_send_cmd(il, &cmd_out); +} + +void +il4965_init_sensitivity(struct il_priv *il) +{ + int ret = 0; + int i; + struct il_sensitivity_data *data = NULL; + const struct il_sensitivity_ranges *ranges = il->hw_params.sens; + + if (il->disable_sens_cal) + return; + + D_CALIB("Start il4965_init_sensitivity\n"); + + /* Clear driver's sensitivity algo data */ + data = &(il->sensitivity_data); + + if (ranges == NULL) + return; + + memset(data, 0, sizeof(struct il_sensitivity_data)); + + data->num_in_cck_no_fa = 0; + data->nrg_curr_state = IL_FA_TOO_MANY; + data->nrg_prev_state = IL_FA_TOO_MANY; + data->nrg_silence_ref = 0; + data->nrg_silence_idx = 0; + data->nrg_energy_idx = 0; + + for (i = 0; i < 10; i++) + data->nrg_value[i] = 0; + + for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) + data->nrg_silence_rssi[i] = 0; + + data->auto_corr_ofdm = ranges->auto_corr_min_ofdm; + data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc; + data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1; + data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1; + data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF; + data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc; + data->nrg_th_cck = ranges->nrg_th_cck; + data->nrg_th_ofdm = ranges->nrg_th_ofdm; + data->barker_corr_th_min = ranges->barker_corr_th_min; + data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc; + data->nrg_th_cca = ranges->nrg_th_cca; + + data->last_bad_plcp_cnt_ofdm = 0; + data->last_fa_cnt_ofdm = 0; + data->last_bad_plcp_cnt_cck = 0; + data->last_fa_cnt_cck = 0; + + ret |= il4965_sensitivity_write(il); + D_CALIB("<<return 0x%X\n", ret); +} + +void +il4965_sensitivity_calibration(struct il_priv *il, void *resp) +{ + u32 rx_enable_time; + u32 fa_cck; + u32 fa_ofdm; + u32 bad_plcp_cck; + u32 bad_plcp_ofdm; + u32 norm_fa_ofdm; + u32 norm_fa_cck; + struct il_sensitivity_data *data = NULL; + struct stats_rx_non_phy *rx_info; + struct stats_rx_phy *ofdm, *cck; + unsigned long flags; + struct stats_general_data statis; + + if (il->disable_sens_cal) + return; + + data = &(il->sensitivity_data); + + if (!il_is_any_associated(il)) { + D_CALIB("<< - not associated\n"); + return; + } + + spin_lock_irqsave(&il->lock, flags); + + rx_info = &(((struct il_notif_stats *)resp)->rx.general); + ofdm = &(((struct il_notif_stats *)resp)->rx.ofdm); + cck = &(((struct il_notif_stats *)resp)->rx.cck); + + if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { + D_CALIB("<< invalid data.\n"); + spin_unlock_irqrestore(&il->lock, flags); + return; + } + + /* Extract Statistics: */ + rx_enable_time = le32_to_cpu(rx_info->channel_load); + fa_cck = le32_to_cpu(cck->false_alarm_cnt); + fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt); + bad_plcp_cck = le32_to_cpu(cck->plcp_err); + bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err); + + statis.beacon_silence_rssi_a = + le32_to_cpu(rx_info->beacon_silence_rssi_a); + statis.beacon_silence_rssi_b = + le32_to_cpu(rx_info->beacon_silence_rssi_b); + statis.beacon_silence_rssi_c = + le32_to_cpu(rx_info->beacon_silence_rssi_c); + statis.beacon_energy_a = le32_to_cpu(rx_info->beacon_energy_a); + statis.beacon_energy_b = le32_to_cpu(rx_info->beacon_energy_b); + statis.beacon_energy_c = le32_to_cpu(rx_info->beacon_energy_c); + + spin_unlock_irqrestore(&il->lock, flags); + + D_CALIB("rx_enable_time = %u usecs\n", rx_enable_time); + + if (!rx_enable_time) { + D_CALIB("<< RX Enable Time == 0!\n"); + return; + } + + /* These stats increase monotonically, and do not reset + * at each beacon. Calculate difference from last value, or just + * use the new stats value if it has reset or wrapped around. */ + if (data->last_bad_plcp_cnt_cck > bad_plcp_cck) + data->last_bad_plcp_cnt_cck = bad_plcp_cck; + else { + bad_plcp_cck -= data->last_bad_plcp_cnt_cck; + data->last_bad_plcp_cnt_cck += bad_plcp_cck; + } + + if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm) + data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm; + else { + bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm; + data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm; + } + + if (data->last_fa_cnt_ofdm > fa_ofdm) + data->last_fa_cnt_ofdm = fa_ofdm; + else { + fa_ofdm -= data->last_fa_cnt_ofdm; + data->last_fa_cnt_ofdm += fa_ofdm; + } + + if (data->last_fa_cnt_cck > fa_cck) + data->last_fa_cnt_cck = fa_cck; + else { + fa_cck -= data->last_fa_cnt_cck; + data->last_fa_cnt_cck += fa_cck; + } + + /* Total aborted signal locks */ + norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm; + norm_fa_cck = fa_cck + bad_plcp_cck; + + D_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck, + bad_plcp_cck, fa_ofdm, bad_plcp_ofdm); + + il4965_sens_auto_corr_ofdm(il, norm_fa_ofdm, rx_enable_time); + il4965_sens_energy_cck(il, norm_fa_cck, rx_enable_time, &statis); + + il4965_sensitivity_write(il); +} + +static inline u8 +il4965_find_first_chain(u8 mask) +{ + if (mask & ANT_A) + return CHAIN_A; + if (mask & ANT_B) + return CHAIN_B; + return CHAIN_C; +} + +/* + * Run disconnected antenna algorithm to find out which antennas are + * disconnected. + */ +static void +il4965_find_disconn_antenna(struct il_priv *il, u32 * average_sig, + struct il_chain_noise_data *data) +{ + u32 active_chains = 0; + u32 max_average_sig; + u16 max_average_sig_antenna_i; + u8 num_tx_chains; + u8 first_chain; + u16 i = 0; + + average_sig[0] = + data->chain_signal_a / + il->cfg->chain_noise_num_beacons; + average_sig[1] = + data->chain_signal_b / + il->cfg->chain_noise_num_beacons; + average_sig[2] = + data->chain_signal_c / + il->cfg->chain_noise_num_beacons; + + if (average_sig[0] >= average_sig[1]) { + max_average_sig = average_sig[0]; + max_average_sig_antenna_i = 0; + active_chains = (1 << max_average_sig_antenna_i); + } else { + max_average_sig = average_sig[1]; + max_average_sig_antenna_i = 1; + active_chains = (1 << max_average_sig_antenna_i); + } + + if (average_sig[2] >= max_average_sig) { + max_average_sig = average_sig[2]; + max_average_sig_antenna_i = 2; + active_chains = (1 << max_average_sig_antenna_i); + } + + D_CALIB("average_sig: a %d b %d c %d\n", average_sig[0], average_sig[1], + average_sig[2]); + D_CALIB("max_average_sig = %d, antenna %d\n", max_average_sig, + max_average_sig_antenna_i); + + /* Compare signal strengths for all 3 receivers. */ + for (i = 0; i < NUM_RX_CHAINS; i++) { + if (i != max_average_sig_antenna_i) { + s32 rssi_delta = (max_average_sig - average_sig[i]); + + /* If signal is very weak, compared with + * strongest, mark it as disconnected. */ + if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS) + data->disconn_array[i] = 1; + else + active_chains |= (1 << i); + D_CALIB("i = %d rssiDelta = %d " + "disconn_array[i] = %d\n", i, rssi_delta, + data->disconn_array[i]); + } + } + + /* + * The above algorithm sometimes fails when the ucode + * reports 0 for all chains. It's not clear why that + * happens to start with, but it is then causing trouble + * because this can make us enable more chains than the + * hardware really has. + * + * To be safe, simply mask out any chains that we know + * are not on the device. + */ + active_chains &= il->hw_params.valid_rx_ant; + + num_tx_chains = 0; + for (i = 0; i < NUM_RX_CHAINS; i++) { + /* loops on all the bits of + * il->hw_setting.valid_tx_ant */ + u8 ant_msk = (1 << i); + if (!(il->hw_params.valid_tx_ant & ant_msk)) + continue; + + num_tx_chains++; + if (data->disconn_array[i] == 0) + /* there is a Tx antenna connected */ + break; + if (num_tx_chains == il->hw_params.tx_chains_num && + data->disconn_array[i]) { + /* + * If all chains are disconnected + * connect the first valid tx chain + */ + first_chain = + il4965_find_first_chain(il->cfg->valid_tx_ant); + data->disconn_array[first_chain] = 0; + active_chains |= BIT(first_chain); + D_CALIB("All Tx chains are disconnected" + "- declare %d as connected\n", first_chain); + break; + } + } + + if (active_chains != il->hw_params.valid_rx_ant && + active_chains != il->chain_noise_data.active_chains) + D_CALIB("Detected that not all antennas are connected! " + "Connected: %#x, valid: %#x.\n", active_chains, + il->hw_params.valid_rx_ant); + + /* Save for use within RXON, TX, SCAN commands, etc. */ + data->active_chains = active_chains; + D_CALIB("active_chains (bitwise) = 0x%x\n", active_chains); +} + +static void +il4965_gain_computation(struct il_priv *il, u32 * average_noise, + u16 min_average_noise_antenna_i, u32 min_average_noise, + u8 default_chain) +{ + int i, ret; + struct il_chain_noise_data *data = &il->chain_noise_data; + + data->delta_gain_code[min_average_noise_antenna_i] = 0; + + for (i = default_chain; i < NUM_RX_CHAINS; i++) { + s32 delta_g = 0; + + if (!data->disconn_array[i] && + data->delta_gain_code[i] == + CHAIN_NOISE_DELTA_GAIN_INIT_VAL) { + delta_g = average_noise[i] - min_average_noise; + data->delta_gain_code[i] = (u8) ((delta_g * 10) / 15); + data->delta_gain_code[i] = + min(data->delta_gain_code[i], + (u8) CHAIN_NOISE_MAX_DELTA_GAIN_CODE); + + data->delta_gain_code[i] = + (data->delta_gain_code[i] | (1 << 2)); + } else { + data->delta_gain_code[i] = 0; + } + } + D_CALIB("delta_gain_codes: a %d b %d c %d\n", data->delta_gain_code[0], + data->delta_gain_code[1], data->delta_gain_code[2]); + + /* Differential gain gets sent to uCode only once */ + if (!data->radio_write) { + struct il_calib_diff_gain_cmd cmd; + data->radio_write = 1; + + memset(&cmd, 0, sizeof(cmd)); + cmd.hdr.op_code = IL_PHY_CALIBRATE_DIFF_GAIN_CMD; + cmd.diff_gain_a = data->delta_gain_code[0]; + cmd.diff_gain_b = data->delta_gain_code[1]; + cmd.diff_gain_c = data->delta_gain_code[2]; + ret = il_send_cmd_pdu(il, C_PHY_CALIBRATION, sizeof(cmd), &cmd); + if (ret) + D_CALIB("fail sending cmd " "C_PHY_CALIBRATION\n"); + + /* TODO we might want recalculate + * rx_chain in rxon cmd */ + + /* Mark so we run this algo only once! */ + data->state = IL_CHAIN_NOISE_CALIBRATED; + } +} + +/* + * Accumulate 16 beacons of signal and noise stats for each of + * 3 receivers/antennas/rx-chains, then figure out: + * 1) Which antennas are connected. + * 2) Differential rx gain settings to balance the 3 receivers. + */ +void +il4965_chain_noise_calibration(struct il_priv *il, void *stat_resp) +{ + struct il_chain_noise_data *data = NULL; + + u32 chain_noise_a; + u32 chain_noise_b; + u32 chain_noise_c; + u32 chain_sig_a; + u32 chain_sig_b; + u32 chain_sig_c; + u32 average_sig[NUM_RX_CHAINS] = { INITIALIZATION_VALUE }; + u32 average_noise[NUM_RX_CHAINS] = { INITIALIZATION_VALUE }; + u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE; + u16 min_average_noise_antenna_i = INITIALIZATION_VALUE; + u16 i = 0; + u16 rxon_chnum = INITIALIZATION_VALUE; + u16 stat_chnum = INITIALIZATION_VALUE; + u8 rxon_band24; + u8 stat_band24; + unsigned long flags; + struct stats_rx_non_phy *rx_info; + + if (il->disable_chain_noise_cal) + return; + + data = &(il->chain_noise_data); + + /* + * Accumulate just the first "chain_noise_num_beacons" after + * the first association, then we're done forever. + */ + if (data->state != IL_CHAIN_NOISE_ACCUMULATE) { + if (data->state == IL_CHAIN_NOISE_ALIVE) + D_CALIB("Wait for noise calib reset\n"); + return; + } + + spin_lock_irqsave(&il->lock, flags); + + rx_info = &(((struct il_notif_stats *)stat_resp)->rx.general); + + if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { + D_CALIB(" << Interference data unavailable\n"); + spin_unlock_irqrestore(&il->lock, flags); + return; + } + + rxon_band24 = !!(il->staging.flags & RXON_FLG_BAND_24G_MSK); + rxon_chnum = le16_to_cpu(il->staging.channel); + + stat_band24 = + !!(((struct il_notif_stats *)stat_resp)-> + flag & STATS_REPLY_FLG_BAND_24G_MSK); + stat_chnum = + le32_to_cpu(((struct il_notif_stats *)stat_resp)->flag) >> 16; + + /* Make sure we accumulate data for just the associated channel + * (even if scanning). */ + if (rxon_chnum != stat_chnum || rxon_band24 != stat_band24) { + D_CALIB("Stats not from chan=%d, band24=%d\n", rxon_chnum, + rxon_band24); + spin_unlock_irqrestore(&il->lock, flags); + return; + } + + /* + * Accumulate beacon stats values across + * "chain_noise_num_beacons" + */ + chain_noise_a = + le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER; + chain_noise_b = + le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER; + chain_noise_c = + le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER; + + chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER; + chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER; + chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER; + + spin_unlock_irqrestore(&il->lock, flags); + + data->beacon_count++; + + data->chain_noise_a = (chain_noise_a + data->chain_noise_a); + data->chain_noise_b = (chain_noise_b + data->chain_noise_b); + data->chain_noise_c = (chain_noise_c + data->chain_noise_c); + + data->chain_signal_a = (chain_sig_a + data->chain_signal_a); + data->chain_signal_b = (chain_sig_b + data->chain_signal_b); + data->chain_signal_c = (chain_sig_c + data->chain_signal_c); + + D_CALIB("chan=%d, band24=%d, beacon=%d\n", rxon_chnum, rxon_band24, + data->beacon_count); + D_CALIB("chain_sig: a %d b %d c %d\n", chain_sig_a, chain_sig_b, + chain_sig_c); + D_CALIB("chain_noise: a %d b %d c %d\n", chain_noise_a, chain_noise_b, + chain_noise_c); + + /* If this is the "chain_noise_num_beacons", determine: + * 1) Disconnected antennas (using signal strengths) + * 2) Differential gain (using silence noise) to balance receivers */ + if (data->beacon_count != il->cfg->chain_noise_num_beacons) + return; + + /* Analyze signal for disconnected antenna */ + il4965_find_disconn_antenna(il, average_sig, data); + + /* Analyze noise for rx balance */ + average_noise[0] = + data->chain_noise_a / il->cfg->chain_noise_num_beacons; + average_noise[1] = + data->chain_noise_b / il->cfg->chain_noise_num_beacons; + average_noise[2] = + data->chain_noise_c / il->cfg->chain_noise_num_beacons; + + for (i = 0; i < NUM_RX_CHAINS; i++) { + if (!data->disconn_array[i] && + average_noise[i] <= min_average_noise) { + /* This means that chain i is active and has + * lower noise values so far: */ + min_average_noise = average_noise[i]; + min_average_noise_antenna_i = i; + } + } + + D_CALIB("average_noise: a %d b %d c %d\n", average_noise[0], + average_noise[1], average_noise[2]); + + D_CALIB("min_average_noise = %d, antenna %d\n", min_average_noise, + min_average_noise_antenna_i); + + il4965_gain_computation(il, average_noise, min_average_noise_antenna_i, + min_average_noise, + il4965_find_first_chain(il->cfg->valid_rx_ant)); + + /* Some power changes may have been made during the calibration. + * Update and commit the RXON + */ + if (il->ops->update_chain_flags) + il->ops->update_chain_flags(il); + + data->state = IL_CHAIN_NOISE_DONE; + il_power_update_mode(il, false); +} + +void +il4965_reset_run_time_calib(struct il_priv *il) +{ + int i; + memset(&(il->sensitivity_data), 0, sizeof(struct il_sensitivity_data)); + memset(&(il->chain_noise_data), 0, sizeof(struct il_chain_noise_data)); + for (i = 0; i < NUM_RX_CHAINS; i++) + il->chain_noise_data.delta_gain_code[i] = + CHAIN_NOISE_DELTA_GAIN_INIT_VAL; + + /* Ask for stats now, the uCode will send notification + * periodically after association */ + il_send_stats_request(il, CMD_ASYNC, true); +} |