drivers/net/wireless/iwlwifi/iwl-agn-hcmd.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-io.h"
  38 #include "iwl-agn.h"
  39
  40 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv)
  41 {
  42         int ret = 0;
  43         struct iwl5000_rxon_assoc_cmd rxon_assoc;
  44         const struct iwl_rxon_cmd *rxon1 = &priv->staging_rxon;
  45         const struct iwl_rxon_cmd *rxon2 = &priv->active_rxon;
  46
  47         if ((rxon1->flags == rxon2->flags) &&
  48             (rxon1->filter_flags == rxon2->filter_flags) &&
  49             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
  50             (rxon1->ofdm_ht_single_stream_basic_rates ==
  51              rxon2->ofdm_ht_single_stream_basic_rates) &&
  52             (rxon1->ofdm_ht_dual_stream_basic_rates ==
  53              rxon2->ofdm_ht_dual_stream_basic_rates) &&
  54             (rxon1->ofdm_ht_triple_stream_basic_rates ==
  55              rxon2->ofdm_ht_triple_stream_basic_rates) &&
  56             (rxon1->acquisition_data == rxon2->acquisition_data) &&
  57             (rxon1->rx_chain == rxon2->rx_chain) &&
  58             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
  59                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
  60                 return 0;
  61         }
  62
  63         rxon_assoc.flags = priv->staging_rxon.flags;
  64         rxon_assoc.filter_flags = priv->staging_rxon.filter_flags;
  65         rxon_assoc.ofdm_basic_rates = priv->staging_rxon.ofdm_basic_rates;
  66         rxon_assoc.cck_basic_rates = priv->staging_rxon.cck_basic_rates;
  67         rxon_assoc.reserved1 = 0;
  68         rxon_assoc.reserved2 = 0;
  69         rxon_assoc.reserved3 = 0;
  70         rxon_assoc.ofdm_ht_single_stream_basic_rates =
  71             priv->staging_rxon.ofdm_ht_single_stream_basic_rates;
  72         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
  73             priv->staging_rxon.ofdm_ht_dual_stream_basic_rates;
  74         rxon_assoc.rx_chain_select_flags = priv->staging_rxon.rx_chain;
  75         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
  76                  priv->staging_rxon.ofdm_ht_triple_stream_basic_rates;
  77         rxon_assoc.acquisition_data = priv->staging_rxon.acquisition_data;
  78
  79         ret = iwl_send_cmd_pdu_async(priv, REPLY_RXON_ASSOC,
  80                                      sizeof(rxon_assoc), &rxon_assoc, NULL);
  81         if (ret)
  82                 return ret;
  83
  84         return ret;
  85 }
  86
  87 static int iwlagn_send_tx_ant_config(struct iwl_priv *priv, u8 valid_tx_ant)
  88 {
  89         struct iwl_tx_ant_config_cmd tx_ant_cmd = {
  90           .valid = cpu_to_le32(valid_tx_ant),
  91         };
  92
  93         if (IWL_UCODE_API(priv->ucode_ver) > 1) {
  94                 IWL_DEBUG_HC(priv, "select valid tx ant: %u\n", valid_tx_ant);
  95                 return iwl_send_cmd_pdu(priv, TX_ANT_CONFIGURATION_CMD,
  96                                         sizeof(struct iwl_tx_ant_config_cmd),
  97                                         &tx_ant_cmd);
  98         } else {
  99                 IWL_DEBUG_HC(priv, "TX_ANT_CONFIGURATION_CMD not supported\n");
 100                 return -EOPNOTSUPP;
 101         }
 102 }
 103
 104 /* Currently this is the superset of everything */
 105 static u16 iwlagn_get_hcmd_size(u8 cmd_id, u16 len)
 106 {
 107         return len;
 108 }
 109
 110 static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 111 {
 112         u16 size = (u16)sizeof(struct iwl_addsta_cmd);
 113         struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
 114         memcpy(addsta, cmd, size);
 115         /* resrved in 5000 */
 116         addsta->rate_n_flags = cpu_to_le16(0);
 117         return size;
 118 }
 119
 120 static void iwlagn_gain_computation(struct iwl_priv *priv,
 121                 u32 average_noise[NUM_RX_CHAINS],
 122                 u16 min_average_noise_antenna_i,
 123                 u32 min_average_noise,
 124                 u8 default_chain)
 125 {
 126         int i;
 127         s32 delta_g;
 128         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 129
 130         /*
 131          * Find Gain Code for the chains based on "default chain"
 132          */
 133         for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {
 134                 if ((data->disconn_array[i])) {
 135                         data->delta_gain_code[i] = 0;
 136                         continue;
 137                 }
 138
 139                 delta_g = (priv->cfg->chain_noise_scale *
 140                         ((s32)average_noise[default_chain] -
 141                         (s32)average_noise[i])) / 1500;
 142
 143                 /* bound gain by 2 bits value max, 3rd bit is sign */
 144                 data->delta_gain_code[i] =
 145                         min(abs(delta_g), (long) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
 146
 147                 if (delta_g < 0)
 148                         /*
 149                          * set negative sign ...
 150                          * note to Intel developers:  This is uCode API format,
 151                          *   not the format of any internal device registers.
 152                          *   Do not change this format for e.g. 6050 or similar
 153                          *   devices.  Change format only if more resolution
 154                          *   (i.e. more than 2 bits magnitude) is needed.
 155                          */
 156                         data->delta_gain_code[i] |= (1 << 2);
 157         }
 158
 159         IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d  ANT_C = %d\n",
 160                         data->delta_gain_code[1], data->delta_gain_code[2]);
 161
 162         if (!data->radio_write) {
 163                 struct iwl_calib_chain_noise_gain_cmd cmd;
 164
 165                 memset(&cmd, 0, sizeof(cmd));
 166
 167                 cmd.hdr.op_code = IWL_PHY_CALIBRATE_CHAIN_NOISE_GAIN_CMD;
 168                 cmd.hdr.first_group = 0;
 169                 cmd.hdr.groups_num = 1;
 170                 cmd.hdr.data_valid = 1;
 171                 cmd.delta_gain_1 = data->delta_gain_code[1];
 172                 cmd.delta_gain_2 = data->delta_gain_code[2];
 173                 iwl_send_cmd_pdu_async(priv, REPLY_PHY_CALIBRATION_CMD,
 174                         sizeof(cmd), &cmd, NULL);
 175
 176                 data->radio_write = 1;
 177                 data->state = IWL_CHAIN_NOISE_CALIBRATED;
 178         }
 179
 180         data->chain_noise_a = 0;
 181         data->chain_noise_b = 0;
 182         data->chain_noise_c = 0;
 183         data->chain_signal_a = 0;
 184         data->chain_signal_b = 0;
 185         data->chain_signal_c = 0;
 186         data->beacon_count = 0;
 187 }
 188
 189 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 190 {
 191         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 192         int ret;
 193
 194         if ((data->state == IWL_CHAIN_NOISE_ALIVE) && iwl_is_associated(priv)) {
 195                 struct iwl_calib_chain_noise_reset_cmd cmd;
 196                 memset(&cmd, 0, sizeof(cmd));
 197
 198                 cmd.hdr.op_code = IWL_PHY_CALIBRATE_CHAIN_NOISE_RESET_CMD;
 199                 cmd.hdr.first_group = 0;
 200                 cmd.hdr.groups_num = 1;
 201                 cmd.hdr.data_valid = 1;
 202                 ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
 203                                         sizeof(cmd), &cmd);
 204                 if (ret)
 205                         IWL_ERR(priv,
 206                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 207                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 208                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 209         }
 210 }
 211
 212 static void iwlagn_rts_tx_cmd_flag(struct ieee80211_tx_info *info,
 213                         __le32 *tx_flags)
 214 {
 215         if ((info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 216             (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 217                 *tx_flags |= TX_CMD_FLG_RTS_CTS_MSK;
 218         else
 219                 *tx_flags &= ~TX_CMD_FLG_RTS_CTS_MSK;
 220 }
 221
 222 /* Calc max signal level (dBm) among 3 possible receivers */
 223 static int iwlagn_calc_rssi(struct iwl_priv *priv,
 224                              struct iwl_rx_phy_res *rx_resp)
 225 {
 226         /* data from PHY/DSP regarding signal strength, etc.,
 227          *   contents are always there, not configurable by host
 228          */
 229         struct iwl5000_non_cfg_phy *ncphy =
 230                 (struct iwl5000_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
 231         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
 232         u8 agc;
 233
 234         val  = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_AGC_IDX]);
 235         agc = (val & IWL50_OFDM_AGC_MSK) >> IWL50_OFDM_AGC_BIT_POS;
 236
 237         /* Find max rssi among 3 possible receivers.
 238          * These values are measured by the digital signal processor (DSP).
 239          * They should stay fairly constant even as the signal strength varies,
 240          *   if the radio's automatic gain control (AGC) is working right.
 241          * AGC value (see below) will provide the "interesting" info.
 242          */
 243         val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_RSSI_AB_IDX]);
 244         rssi_a = (val & IWL50_OFDM_RSSI_A_MSK) >> IWL50_OFDM_RSSI_A_BIT_POS;
 245         rssi_b = (val & IWL50_OFDM_RSSI_B_MSK) >> IWL50_OFDM_RSSI_B_BIT_POS;
 246         val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_RSSI_C_IDX]);
 247         rssi_c = (val & IWL50_OFDM_RSSI_C_MSK) >> IWL50_OFDM_RSSI_C_BIT_POS;
 248
 249         max_rssi = max_t(u32, rssi_a, rssi_b);
 250         max_rssi = max_t(u32, max_rssi, rssi_c);
 251
 252         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
 253                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
 254
 255         /* dBm = max_rssi dB - agc dB - constant.
 256          * Higher AGC (higher radio gain) means lower signal. */
 257         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
 258 }
 259
 260 struct iwl_hcmd_ops iwlagn_hcmd = {
 261         .rxon_assoc = iwlagn_send_rxon_assoc,
 262         .commit_rxon = iwl_commit_rxon,
 263         .set_rxon_chain = iwl_set_rxon_chain,
 264         .set_tx_ant = iwlagn_send_tx_ant_config,
 265 };
 266
 267 struct iwl_hcmd_utils_ops iwlagn_hcmd_utils = {
 268         .get_hcmd_size = iwlagn_get_hcmd_size,
 269         .build_addsta_hcmd = iwlagn_build_addsta_hcmd,
 270         .gain_computation = iwlagn_gain_computation,
 271         .chain_noise_reset = iwlagn_chain_noise_reset,
 272         .rts_tx_cmd_flag = iwlagn_rts_tx_cmd_flag,
 273         .calc_rssi = iwlagn_calc_rssi,
 274         .request_scan = iwlagn_request_scan,
 275 };