release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/wireless/iwlwifi/iwl-agn-rx.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2010 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-calib.h"
  38 #include "iwl-sta.h"
  39 #include "iwl-io.h"
  40 #include "iwl-helpers.h"
  41 #include "iwl-agn-hw.h"
  42 #include "iwl-agn.h"
  43
  44 void iwl_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                         iwl_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 iwl_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         if (priv->cfg->bt_statistics)
  77                 rx_info = &(priv->_agn.statistics_bt.rx.general.common);
  78         else
  79                 rx_info = &(priv->_agn.statistics.rx.general);
  80         bcn_silence_a =
  81                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
  82         bcn_silence_b =
  83                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
  84         bcn_silence_c =
  85                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
  86
  87         if (bcn_silence_a) {
  88                 total_silence += bcn_silence_a;
  89                 num_active_rx++;
  90         }
  91         if (bcn_silence_b) {
  92                 total_silence += bcn_silence_b;
  93                 num_active_rx++;
  94         }
  95         if (bcn_silence_c) {
  96                 total_silence += bcn_silence_c;
  97                 num_active_rx++;
  98         }
  99
 100         /* Average among active antennas */
 101         if (num_active_rx)
 102                 last_rx_noise = (total_silence / num_active_rx) - 107;
 103         else
 104                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 105
 106         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 107                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 108                         last_rx_noise);
 109 }
 110
 111 #ifdef CONFIG_IWLWIFI_DEBUGFS
 112 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 113                                         __le32 *stats)
 114 {
 115         int i, size;
 116         __le32 *prev_stats;
 117         u32 *accum_stats;
 118         u32 *delta, *max_delta;
 119         struct statistics_general_common *general, *accum_general;
 120         struct statistics_tx *tx, *accum_tx;
 121
 122         if (priv->cfg->bt_statistics) {
 123                 prev_stats = (__le32 *)&priv->_agn.statistics_bt;
 124                 accum_stats = (u32 *)&priv->_agn.accum_statistics_bt;
 125                 size = sizeof(struct iwl_bt_notif_statistics);
 126                 general = &priv->_agn.statistics_bt.general.common;
 127                 accum_general = &priv->_agn.accum_statistics_bt.general.common;
 128                 tx = &priv->_agn.statistics_bt.tx;
 129                 accum_tx = &priv->_agn.accum_statistics_bt.tx;
 130                 delta = (u32 *)&priv->_agn.delta_statistics_bt;
 131                 max_delta = (u32 *)&priv->_agn.max_delta_bt;
 132         } else {
 133                 prev_stats = (__le32 *)&priv->_agn.statistics;
 134                 accum_stats = (u32 *)&priv->_agn.accum_statistics;
 135                 size = sizeof(struct iwl_notif_statistics);
 136                 general = &priv->_agn.statistics.general.common;
 137                 accum_general = &priv->_agn.accum_statistics.general.common;
 138                 tx = &priv->_agn.statistics.tx;
 139                 accum_tx = &priv->_agn.accum_statistics.tx;
 140                 delta = (u32 *)&priv->_agn.delta_statistics;
 141                 max_delta = (u32 *)&priv->_agn.max_delta;
 142         }
 143         for (i = sizeof(__le32); i < size;
 144              i += sizeof(__le32), stats++, prev_stats++, delta++,
 145              max_delta++, accum_stats++) {
 146                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 147                         *delta = (le32_to_cpu(*stats) -
 148                                 le32_to_cpu(*prev_stats));
 149                         *accum_stats += *delta;
 150                         if (*delta > *max_delta)
 151                                 *max_delta = *delta;
 152                 }
 153         }
 154
 155         /* reset accumulative statistics for "no-counter" type statistics */
 156         accum_general->temperature = general->temperature;
 157         accum_general->temperature_m = general->temperature_m;
 158         accum_general->ttl_timestamp = general->ttl_timestamp;
 159         accum_tx->tx_power.ant_a = tx->tx_power.ant_a;
 160         accum_tx->tx_power.ant_b = tx->tx_power.ant_b;
 161         accum_tx->tx_power.ant_c = tx->tx_power.ant_c;
 162 }
 163 #endif
 164
 165 #define REG_RECALIB_PERIOD (60)
 166
 167 /**
 168  * iwl_good_plcp_health - checks for plcp error.
 169  *
 170  * When the plcp error is exceeding the thresholds, reset the radio
 171  * to improve the throughput.
 172  */
 173 bool iwl_good_plcp_health(struct iwl_priv *priv,
 174                                 struct iwl_rx_packet *pkt)
 175 {
 176         bool rc = true;
 177         int combined_plcp_delta;
 178         unsigned int plcp_msec;
 179         unsigned long plcp_received_jiffies;
 180
 181         if (priv->cfg->plcp_delta_threshold ==
 182             IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 183                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 184                 return rc;
 185         }
 186
 187         /*
 188          * check for plcp_err and trigger radio reset if it exceeds
 189          * the plcp error threshold plcp_delta.
 190          */
 191         plcp_received_jiffies = jiffies;
 192         plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
 193                                         (long) priv->plcp_jiffies);
 194         priv->plcp_jiffies = plcp_received_jiffies;
 195         /*
 196          * check to make sure plcp_msec is not 0 to prevent division
 197          * by zero.
 198          */
 199         if (plcp_msec) {
 200                 struct statistics_rx_phy *ofdm;
 201                 struct statistics_rx_ht_phy *ofdm_ht;
 202
 203                 if (priv->cfg->bt_statistics) {
 204                         ofdm = &pkt->u.stats_bt.rx.ofdm;
 205                         ofdm_ht = &pkt->u.stats_bt.rx.ofdm_ht;
 206                         combined_plcp_delta =
 207                            (le32_to_cpu(ofdm->plcp_err) -
 208                            le32_to_cpu(priv->_agn.statistics_bt.
 209                                        rx.ofdm.plcp_err)) +
 210                            (le32_to_cpu(ofdm_ht->plcp_err) -
 211                            le32_to_cpu(priv->_agn.statistics_bt.
 212                                        rx.ofdm_ht.plcp_err));
 213                 } else {
 214                         ofdm = &pkt->u.stats.rx.ofdm;
 215                         ofdm_ht = &pkt->u.stats.rx.ofdm_ht;
 216                         combined_plcp_delta =
 217                             (le32_to_cpu(ofdm->plcp_err) -
 218                             le32_to_cpu(priv->_agn.statistics.
 219                                         rx.ofdm.plcp_err)) +
 220                             (le32_to_cpu(ofdm_ht->plcp_err) -
 221                             le32_to_cpu(priv->_agn.statistics.
 222                                         rx.ofdm_ht.plcp_err));
 223                 }
 224
 225                 if ((combined_plcp_delta > 0) &&
 226                     ((combined_plcp_delta * 100) / plcp_msec) >
 227                         priv->cfg->plcp_delta_threshold) {
 228                         /*
 229                          * if plcp_err exceed the threshold,
 230                          * the following data is printed in csv format:
 231                          *    Text: plcp_err exceeded %d,
 232                          *    Received ofdm.plcp_err,
 233                          *    Current ofdm.plcp_err,
 234                          *    Received ofdm_ht.plcp_err,
 235                          *    Current ofdm_ht.plcp_err,
 236                          *    combined_plcp_delta,
 237                          *    plcp_msec
 238                          */
 239                         IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
 240                                     "%u, %u, %u, %u, %d, %u mSecs\n",
 241                                     priv->cfg->plcp_delta_threshold,
 242                                     le32_to_cpu(ofdm->plcp_err),
 243                                     le32_to_cpu(ofdm->plcp_err),
 244                                     le32_to_cpu(ofdm_ht->plcp_err),
 245                                     le32_to_cpu(ofdm_ht->plcp_err),
 246                                     combined_plcp_delta, plcp_msec);
 247
 248                         rc = false;
 249                 }
 250         }
 251         return rc;
 252 }
 253
 254 void iwl_rx_statistics(struct iwl_priv *priv,
 255                               struct iwl_rx_mem_buffer *rxb)
 256 {
 257         int change;
 258         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 259
 260         if (priv->cfg->bt_statistics) {
 261                 IWL_DEBUG_RX(priv,
 262                              "Statistics notification received (%d vs %d).\n",
 263                              (int)sizeof(struct iwl_bt_notif_statistics),
 264                              le32_to_cpu(pkt->len_n_flags) &
 265                              FH_RSCSR_FRAME_SIZE_MSK);
 266
 267                 change = ((priv->_agn.statistics_bt.general.common.temperature !=
 268                            pkt->u.stats_bt.general.common.temperature) ||
 269                            ((priv->_agn.statistics_bt.flag &
 270                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 271                            (pkt->u.stats_bt.flag &
 272                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 273 #ifdef CONFIG_IWLWIFI_DEBUGFS
 274                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats_bt);
 275 #endif
 276
 277         } else {
 278                 IWL_DEBUG_RX(priv,
 279                              "Statistics notification received (%d vs %d).\n",
 280                              (int)sizeof(struct iwl_notif_statistics),
 281                              le32_to_cpu(pkt->len_n_flags) &
 282                              FH_RSCSR_FRAME_SIZE_MSK);
 283
 284                 change = ((priv->_agn.statistics.general.common.temperature !=
 285                            pkt->u.stats.general.common.temperature) ||
 286                            ((priv->_agn.statistics.flag &
 287                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 288                            (pkt->u.stats.flag &
 289                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 290 #ifdef CONFIG_IWLWIFI_DEBUGFS
 291                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 292 #endif
 293
 294         }
 295
 296         iwl_recover_from_statistics(priv, pkt);
 297
 298         if (priv->cfg->bt_statistics)
 299                 memcpy(&priv->_agn.statistics_bt, &pkt->u.stats_bt,
 300                         sizeof(priv->_agn.statistics_bt));
 301         else
 302                 memcpy(&priv->_agn.statistics, &pkt->u.stats,
 303                         sizeof(priv->_agn.statistics));
 304
 305         set_bit(STATUS_STATISTICS, &priv->status);
 306
 307         /* Reschedule the statistics timer to occur in
 308          * REG_RECALIB_PERIOD seconds to ensure we get a
 309          * thermal update even if the uCode doesn't give
 310          * us one */
 311         mod_timer(&priv->statistics_periodic, jiffies +
 312                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 313
 314         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 315             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 316                 iwl_rx_calc_noise(priv);
 317                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 318         }
 319         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 320                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 321 }
 322
 323 void iwl_reply_statistics(struct iwl_priv *priv,
 324                               struct iwl_rx_mem_buffer *rxb)
 325 {
 326         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 327
 328         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 329 #ifdef CONFIG_IWLWIFI_DEBUGFS
 330                 memset(&priv->_agn.accum_statistics, 0,
 331                         sizeof(struct iwl_notif_statistics));
 332                 memset(&priv->_agn.delta_statistics, 0,
 333                         sizeof(struct iwl_notif_statistics));
 334                 memset(&priv->_agn.max_delta, 0,
 335                         sizeof(struct iwl_notif_statistics));
 336                 memset(&priv->_agn.accum_statistics_bt, 0,
 337                         sizeof(struct iwl_bt_notif_statistics));
 338                 memset(&priv->_agn.delta_statistics_bt, 0,
 339                         sizeof(struct iwl_bt_notif_statistics));
 340                 memset(&priv->_agn.max_delta_bt, 0,
 341                         sizeof(struct iwl_bt_notif_statistics));
 342 #endif
 343                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 344         }
 345         iwl_rx_statistics(priv, rxb);
 346 }