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-agn-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 (iwl_bt_statistics(priv))
  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 /*
 113  *  based on the assumption of all statistics counter are in DWORD
 114  *  FIXME: This function is for debugging, do not deal with
 115  *  the case of counters roll-over.
 116  */
 117 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 118                                         __le32 *stats)
 119 {
 120         int i, size;
 121         __le32 *prev_stats;
 122         u32 *accum_stats;
 123         u32 *delta, *max_delta;
 124         struct statistics_general_common *general, *accum_general;
 125         struct statistics_tx *tx, *accum_tx;
 126
 127         if (iwl_bt_statistics(priv)) {
 128                 prev_stats = (__le32 *)&priv->_agn.statistics_bt;
 129                 accum_stats = (u32 *)&priv->_agn.accum_statistics_bt;
 130                 size = sizeof(struct iwl_bt_notif_statistics);
 131                 general = &priv->_agn.statistics_bt.general.common;
 132                 accum_general = &priv->_agn.accum_statistics_bt.general.common;
 133                 tx = &priv->_agn.statistics_bt.tx;
 134                 accum_tx = &priv->_agn.accum_statistics_bt.tx;
 135                 delta = (u32 *)&priv->_agn.delta_statistics_bt;
 136                 max_delta = (u32 *)&priv->_agn.max_delta_bt;
 137         } else {
 138                 prev_stats = (__le32 *)&priv->_agn.statistics;
 139                 accum_stats = (u32 *)&priv->_agn.accum_statistics;
 140                 size = sizeof(struct iwl_notif_statistics);
 141                 general = &priv->_agn.statistics.general.common;
 142                 accum_general = &priv->_agn.accum_statistics.general.common;
 143                 tx = &priv->_agn.statistics.tx;
 144                 accum_tx = &priv->_agn.accum_statistics.tx;
 145                 delta = (u32 *)&priv->_agn.delta_statistics;
 146                 max_delta = (u32 *)&priv->_agn.max_delta;
 147         }
 148         for (i = sizeof(__le32); i < size;
 149              i += sizeof(__le32), stats++, prev_stats++, delta++,
 150              max_delta++, accum_stats++) {
 151                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 152                         *delta = (le32_to_cpu(*stats) -
 153                                 le32_to_cpu(*prev_stats));
 154                         *accum_stats += *delta;
 155                         if (*delta > *max_delta)
 156                                 *max_delta = *delta;
 157                 }
 158         }
 159
 160         /* reset accumulative statistics for "no-counter" type statistics */
 161         accum_general->temperature = general->temperature;
 162         accum_general->temperature_m = general->temperature_m;
 163         accum_general->ttl_timestamp = general->ttl_timestamp;
 164         accum_tx->tx_power.ant_a = tx->tx_power.ant_a;
 165         accum_tx->tx_power.ant_b = tx->tx_power.ant_b;
 166         accum_tx->tx_power.ant_c = tx->tx_power.ant_c;
 167 }
 168 #endif
 169
 170 #define REG_RECALIB_PERIOD (60)
 171
 172 void iwl_rx_statistics(struct iwl_priv *priv,
 173                               struct iwl_rx_mem_buffer *rxb)
 174 {
 175         int change;
 176         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 177
 178         if (iwl_bt_statistics(priv)) {
 179                 IWL_DEBUG_RX(priv,
 180                              "Statistics notification received (%d vs %d).\n",
 181                              (int)sizeof(struct iwl_bt_notif_statistics),
 182                              le32_to_cpu(pkt->len_n_flags) &
 183                              FH_RSCSR_FRAME_SIZE_MSK);
 184
 185                 change = ((priv->_agn.statistics_bt.general.common.temperature !=
 186                            pkt->u.stats_bt.general.common.temperature) ||
 187                            ((priv->_agn.statistics_bt.flag &
 188                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 189                            (pkt->u.stats_bt.flag &
 190                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 191 #ifdef CONFIG_IWLWIFI_DEBUGFS
 192                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats_bt);
 193 #endif
 194
 195         } else {
 196                 IWL_DEBUG_RX(priv,
 197                              "Statistics notification received (%d vs %d).\n",
 198                              (int)sizeof(struct iwl_notif_statistics),
 199                              le32_to_cpu(pkt->len_n_flags) &
 200                              FH_RSCSR_FRAME_SIZE_MSK);
 201
 202                 change = ((priv->_agn.statistics.general.common.temperature !=
 203                            pkt->u.stats.general.common.temperature) ||
 204                            ((priv->_agn.statistics.flag &
 205                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 206                            (pkt->u.stats.flag &
 207                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 208 #ifdef CONFIG_IWLWIFI_DEBUGFS
 209                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 210 #endif
 211
 212         }
 213
 214         iwl_recover_from_statistics(priv, pkt);
 215
 216         if (iwl_bt_statistics(priv))
 217                 memcpy(&priv->_agn.statistics_bt, &pkt->u.stats_bt,
 218                         sizeof(priv->_agn.statistics_bt));
 219         else
 220                 memcpy(&priv->_agn.statistics, &pkt->u.stats,
 221                         sizeof(priv->_agn.statistics));
 222
 223         set_bit(STATUS_STATISTICS, &priv->status);
 224
 225         /* Reschedule the statistics timer to occur in
 226          * REG_RECALIB_PERIOD seconds to ensure we get a
 227          * thermal update even if the uCode doesn't give
 228          * us one */
 229         mod_timer(&priv->statistics_periodic, jiffies +
 230                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 231
 232         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 233             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 234                 iwl_rx_calc_noise(priv);
 235                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 236         }
 237         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 238                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 239 }
 240
 241 void iwl_reply_statistics(struct iwl_priv *priv,
 242                               struct iwl_rx_mem_buffer *rxb)
 243 {
 244         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 245
 246         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 247 #ifdef CONFIG_IWLWIFI_DEBUGFS
 248                 memset(&priv->_agn.accum_statistics, 0,
 249                         sizeof(struct iwl_notif_statistics));
 250                 memset(&priv->_agn.delta_statistics, 0,
 251                         sizeof(struct iwl_notif_statistics));
 252                 memset(&priv->_agn.max_delta, 0,
 253                         sizeof(struct iwl_notif_statistics));
 254                 memset(&priv->_agn.accum_statistics_bt, 0,
 255                         sizeof(struct iwl_bt_notif_statistics));
 256                 memset(&priv->_agn.delta_statistics_bt, 0,
 257                         sizeof(struct iwl_bt_notif_statistics));
 258                 memset(&priv->_agn.max_delta_bt, 0,
 259                         sizeof(struct iwl_bt_notif_statistics));
 260 #endif
 261                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 262         }
 263         iwl_rx_statistics(priv, rxb);
 264 }