drivers/net/wireless/iwlegacy/iwl-4965-rx.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/sched.h>
  34
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-4965-calib.h"
  38 #include "iwl-sta.h"
  39 #include "iwl-io.h"
  40 #include "iwl-helpers.h"
  41 #include "iwl-4965-hw.h"
  42 #include "iwl-4965.h"
  43
  44 void iwl4965_rx_missed_beacon_notif(struct iwl_priv *priv,
  45                                 struct iwl_rx_mem_buffer *rxb)
  46
  47 {
  48         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  49         struct iwl_missed_beacon_notif *missed_beacon;
  50
  51         missed_beacon = &pkt->u.missed_beacon;
  52         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
  53             priv->missed_beacon_threshold) {
  54                 IWL_DEBUG_CALIB(priv,
  55                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
  56                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
  57                     le32_to_cpu(missed_beacon->total_missed_becons),
  58                     le32_to_cpu(missed_beacon->num_recvd_beacons),
  59                     le32_to_cpu(missed_beacon->num_expected_beacons));
  60                 if (!test_bit(STATUS_SCANNING, &priv->status))
  61                         iwl4965_init_sensitivity(priv);
  62         }
  63 }
  64
  65 /* Calculate noise level, based on measurements during network silence just
  66  *   before arriving beacon.  This measurement can be done only if we know
  67  *   exactly when to expect beacons, therefore only when we're associated. */
  68 static void iwl4965_rx_calc_noise(struct iwl_priv *priv)
  69 {
  70         struct statistics_rx_non_phy *rx_info;
  71         int num_active_rx = 0;
  72         int total_silence = 0;
  73         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
  74         int last_rx_noise;
  75
  76         rx_info = &(priv->_4965.statistics.rx.general);
  77         bcn_silence_a =
  78                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
  79         bcn_silence_b =
  80                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
  81         bcn_silence_c =
  82                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
  83
  84         if (bcn_silence_a) {
  85                 total_silence += bcn_silence_a;
  86                 num_active_rx++;
  87         }
  88         if (bcn_silence_b) {
  89                 total_silence += bcn_silence_b;
  90                 num_active_rx++;
  91         }
  92         if (bcn_silence_c) {
  93                 total_silence += bcn_silence_c;
  94                 num_active_rx++;
  95         }
  96
  97         /* Average among active antennas */
  98         if (num_active_rx)
  99                 last_rx_noise = (total_silence / num_active_rx) - 107;
 100         else
 101                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 102
 103         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 104                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 105                         last_rx_noise);
 106 }
 107
 108 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUGFS
 109 /*
 110  *  based on the assumption of all statistics counter are in DWORD
 111  *  FIXME: This function is for debugging, do not deal with
 112  *  the case of counters roll-over.
 113  */
 114 static void iwl4965_accumulative_statistics(struct iwl_priv *priv,
 115                                         __le32 *stats)
 116 {
 117         int i, size;
 118         __le32 *prev_stats;
 119         u32 *accum_stats;
 120         u32 *delta, *max_delta;
 121         struct statistics_general_common *general, *accum_general;
 122         struct statistics_tx *tx, *accum_tx;
 123
 124         prev_stats = (__le32 *)&priv->_4965.statistics;
 125         accum_stats = (u32 *)&priv->_4965.accum_statistics;
 126         size = sizeof(struct iwl_notif_statistics);
 127         general = &priv->_4965.statistics.general.common;
 128         accum_general = &priv->_4965.accum_statistics.general.common;
 129         tx = &priv->_4965.statistics.tx;
 130         accum_tx = &priv->_4965.accum_statistics.tx;
 131         delta = (u32 *)&priv->_4965.delta_statistics;
 132         max_delta = (u32 *)&priv->_4965.max_delta;
 133
 134         for (i = sizeof(__le32); i < size;
 135              i += sizeof(__le32), stats++, prev_stats++, delta++,
 136              max_delta++, accum_stats++) {
 137                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 138                         *delta = (le32_to_cpu(*stats) -
 139                                 le32_to_cpu(*prev_stats));
 140                         *accum_stats += *delta;
 141                         if (*delta > *max_delta)
 142                                 *max_delta = *delta;
 143                 }
 144         }
 145
 146         /* reset accumulative statistics for "no-counter" type statistics */
 147         accum_general->temperature = general->temperature;
 148         accum_general->ttl_timestamp = general->ttl_timestamp;
 149 }
 150 #endif
 151
 152 #define REG_RECALIB_PERIOD (60)
 153
 154 /**
 155  * iwl4965_good_plcp_health - checks for plcp error.
 156  *
 157  * When the plcp error is exceeding the thresholds, reset the radio
 158  * to improve the throughput.
 159  */
 160 bool iwl4965_good_plcp_health(struct iwl_priv *priv,
 161                                 struct iwl_rx_packet *pkt)
 162 {
 163         bool rc = true;
 164         int combined_plcp_delta;
 165         unsigned int plcp_msec;
 166         unsigned long plcp_received_jiffies;
 167
 168         if (priv->cfg->base_params->plcp_delta_threshold ==
 169             IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 170                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 171                 return rc;
 172         }
 173
 174         /*
 175          * check for plcp_err and trigger radio reset if it exceeds
 176          * the plcp error threshold plcp_delta.
 177          */
 178         plcp_received_jiffies = jiffies;
 179         plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
 180                                         (long) priv->plcp_jiffies);
 181         priv->plcp_jiffies = plcp_received_jiffies;
 182         /*
 183          * check to make sure plcp_msec is not 0 to prevent division
 184          * by zero.
 185          */
 186         if (plcp_msec) {
 187                 struct statistics_rx_phy *ofdm;
 188                 struct statistics_rx_ht_phy *ofdm_ht;
 189
 190                 ofdm = &pkt->u.stats.rx.ofdm;
 191                 ofdm_ht = &pkt->u.stats.rx.ofdm_ht;
 192                 combined_plcp_delta =
 193                     (le32_to_cpu(ofdm->plcp_err) -
 194                     le32_to_cpu(priv->_4965.statistics.
 195                                 rx.ofdm.plcp_err)) +
 196                     (le32_to_cpu(ofdm_ht->plcp_err) -
 197                     le32_to_cpu(priv->_4965.statistics.
 198                                 rx.ofdm_ht.plcp_err));
 199
 200                 if ((combined_plcp_delta > 0) &&
 201                     ((combined_plcp_delta * 100) / plcp_msec) >
 202                         priv->cfg->base_params->plcp_delta_threshold) {
 203                         /*
 204                          * if plcp_err exceed the threshold,
 205                          * the following data is printed in csv format:
 206                          *    Text: plcp_err exceeded %d,
 207                          *    Received ofdm.plcp_err,
 208                          *    Current ofdm.plcp_err,
 209                          *    Received ofdm_ht.plcp_err,
 210                          *    Current ofdm_ht.plcp_err,
 211                          *    combined_plcp_delta,
 212                          *    plcp_msec
 213                          */
 214                         IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
 215                                 "%u, %u, %u, %u, %d, %u mSecs\n",
 216                                 priv->cfg->base_params->plcp_delta_threshold,
 217                                 le32_to_cpu(ofdm->plcp_err),
 218                                 le32_to_cpu(ofdm->plcp_err),
 219                                 le32_to_cpu(ofdm_ht->plcp_err),
 220                                 le32_to_cpu(ofdm_ht->plcp_err),
 221                                 combined_plcp_delta, plcp_msec);
 222
 223                         rc = false;
 224                 }
 225         }
 226         return rc;
 227 }
 228
 229 void iwl4965_rx_statistics(struct iwl_priv *priv,
 230                               struct iwl_rx_mem_buffer *rxb)
 231 {
 232         int change;
 233         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 234
 235         IWL_DEBUG_RX(priv,
 236                      "Statistics notification received (%d vs %d).\n",
 237                      (int)sizeof(struct iwl_notif_statistics),
 238                      le32_to_cpu(pkt->len_n_flags) &
 239                      FH_RSCSR_FRAME_SIZE_MSK);
 240
 241         change = ((priv->_4965.statistics.general.common.temperature !=
 242                    pkt->u.stats.general.common.temperature) ||
 243                    ((priv->_4965.statistics.flag &
 244                    STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 245                    (pkt->u.stats.flag &
 246                    STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 247 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUGFS
 248         iwl4965_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 249 #endif
 250
 251         iwl_legacy_recover_from_statistics(priv, pkt);
 252
 253         memcpy(&priv->_4965.statistics, &pkt->u.stats,
 254                 sizeof(priv->_4965.statistics));
 255
 256         set_bit(STATUS_STATISTICS, &priv->status);
 257
 258         /* Reschedule the statistics timer to occur in
 259          * REG_RECALIB_PERIOD seconds to ensure we get a
 260          * thermal update even if the uCode doesn't give
 261          * us one */
 262         mod_timer(&priv->statistics_periodic, jiffies +
 263                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 264
 265         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 266             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 267                 iwl4965_rx_calc_noise(priv);
 268                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 269         }
 270         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 271                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 272 }
 273
 274 void iwl4965_reply_statistics(struct iwl_priv *priv,
 275                               struct iwl_rx_mem_buffer *rxb)
 276 {
 277         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 278
 279         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 280 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUGFS
 281                 memset(&priv->_4965.accum_statistics, 0,
 282                         sizeof(struct iwl_notif_statistics));
 283                 memset(&priv->_4965.delta_statistics, 0,
 284                         sizeof(struct iwl_notif_statistics));
 285                 memset(&priv->_4965.max_delta, 0,
 286                         sizeof(struct iwl_notif_statistics));
 287 #endif
 288                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 289         }
 290         iwl4965_rx_statistics(priv, rxb);
 291 }