drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c

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  10  * Copyright(c) 2017           Intel Deutschland GmbH
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  34  *
  35  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  36  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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  54  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  63  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  64  *
  65  *****************************************************************************/
  66
  67 #include <net/mac80211.h>
  68 #include "fw-api.h"
  69 #include "mvm.h"
  70
  71 /* Maps the driver specific channel width definition to the fw values */
  72 u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
  73 {
  74         switch (chandef->width) {
  75         case NL80211_CHAN_WIDTH_20_NOHT:
  76         case NL80211_CHAN_WIDTH_20:
  77                 return PHY_VHT_CHANNEL_MODE20;
  78         case NL80211_CHAN_WIDTH_40:
  79                 return PHY_VHT_CHANNEL_MODE40;
  80         case NL80211_CHAN_WIDTH_80:
  81                 return PHY_VHT_CHANNEL_MODE80;
  82         case NL80211_CHAN_WIDTH_160:
  83                 return PHY_VHT_CHANNEL_MODE160;
  84         default:
  85                 WARN(1, "Invalid channel width=%u", chandef->width);
  86                 return PHY_VHT_CHANNEL_MODE20;
  87         }
  88 }
  89
  90 /*
  91  * Maps the driver specific control channel position (relative to the center
  92  * freq) definitions to the the fw values
  93  */
  94 u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
  95 {
  96         switch (chandef->chan->center_freq - chandef->center_freq1) {
  97         case -70:
  98                 return PHY_VHT_CTRL_POS_4_BELOW;
  99         case -50:
 100                 return PHY_VHT_CTRL_POS_3_BELOW;
 101         case -30:
 102                 return PHY_VHT_CTRL_POS_2_BELOW;
 103         case -10:
 104                 return PHY_VHT_CTRL_POS_1_BELOW;
 105         case  10:
 106                 return PHY_VHT_CTRL_POS_1_ABOVE;
 107         case  30:
 108                 return PHY_VHT_CTRL_POS_2_ABOVE;
 109         case  50:
 110                 return PHY_VHT_CTRL_POS_3_ABOVE;
 111         case  70:
 112                 return PHY_VHT_CTRL_POS_4_ABOVE;
 113         default:
 114                 WARN(1, "Invalid channel definition");
 115         case 0:
 116                 /*
 117                  * The FW is expected to check the control channel position only
 118                  * when in HT/VHT and the channel width is not 20MHz. Return
 119                  * this value as the default one.
 120                  */
 121                 return PHY_VHT_CTRL_POS_1_BELOW;
 122         }
 123 }
 124
 125 /*
 126  * Construct the generic fields of the PHY context command
 127  */
 128 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
 129                                      struct iwl_phy_context_cmd *cmd,
 130                                      u32 action, u32 apply_time)
 131 {
 132         memset(cmd, 0, sizeof(struct iwl_phy_context_cmd));
 133
 134         cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
 135                                                             ctxt->color));
 136         cmd->action = cpu_to_le32(action);
 137         cmd->apply_time = cpu_to_le32(apply_time);
 138 }
 139
 140 /*
 141  * Add the phy configuration to the PHY context command
 142  */
 143 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
 144                                       struct iwl_phy_context_cmd *cmd,
 145                                       struct cfg80211_chan_def *chandef,
 146                                       u8 chains_static, u8 chains_dynamic)
 147 {
 148         u8 active_cnt, idle_cnt;
 149
 150         /* Set the channel info data */
 151         cmd->ci.band = (chandef->chan->band == NL80211_BAND_2GHZ ?
 152               PHY_BAND_24 : PHY_BAND_5);
 153
 154         cmd->ci.channel = chandef->chan->hw_value;
 155         cmd->ci.width = iwl_mvm_get_channel_width(chandef);
 156         cmd->ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);
 157
 158         /* Set rx the chains */
 159         idle_cnt = chains_static;
 160         active_cnt = chains_dynamic;
 161
 162         /* In scenarios where we only ever use a single-stream rates,
 163          * i.e. legacy 11b/g/a associations, single-stream APs or even
 164          * static SMPS, enable both chains to get diversity, improving
 165          * the case where we're far enough from the AP that attenuation
 166          * between the two antennas is sufficiently different to impact
 167          * performance.
 168          */
 169         if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm)) {
 170                 idle_cnt = 2;
 171                 active_cnt = 2;
 172         }
 173
 174         cmd->rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
 175                                         PHY_RX_CHAIN_VALID_POS);
 176         cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
 177         cmd->rxchain_info |= cpu_to_le32(active_cnt <<
 178                                          PHY_RX_CHAIN_MIMO_CNT_POS);
 179 #ifdef CONFIG_IWLWIFI_DEBUGFS
 180         if (unlikely(mvm->dbgfs_rx_phyinfo))
 181                 cmd->rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
 182 #endif
 183
 184         cmd->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
 185 }
 186
 187 /*
 188  * Send a command to apply the current phy configuration. The command is send
 189  * only if something in the configuration changed: in case that this is the
 190  * first time that the phy configuration is applied or in case that the phy
 191  * configuration changed from the previous apply.
 192  */
 193 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
 194                                   struct iwl_mvm_phy_ctxt *ctxt,
 195                                   struct cfg80211_chan_def *chandef,
 196                                   u8 chains_static, u8 chains_dynamic,
 197                                   u32 action, u32 apply_time)
 198 {
 199         struct iwl_phy_context_cmd cmd;
 200         int ret;
 201
 202         /* Set the command header fields */
 203         iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);
 204
 205         /* Set the command data */
 206         iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
 207                                   chains_static, chains_dynamic);
 208
 209         ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 0,
 210                                    sizeof(struct iwl_phy_context_cmd),
 211                                    &cmd);
 212         if (ret)
 213                 IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
 214         return ret;
 215 }
 216
 217 /*
 218  * Send a command to add a PHY context based on the current HW configuration.
 219  */
 220 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 221                          struct cfg80211_chan_def *chandef,
 222                          u8 chains_static, u8 chains_dynamic)
 223 {
 224         WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
 225                 ctxt->ref);
 226         lockdep_assert_held(&mvm->mutex);
 227
 228         ctxt->channel = chandef->chan;
 229
 230         return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 231                                       chains_static, chains_dynamic,
 232                                       FW_CTXT_ACTION_ADD, 0);
 233 }
 234
 235 /*
 236  * Update the number of references to the given PHY context. This is valid only
 237  * in case the PHY context was already created, i.e., its reference count > 0.
 238  */
 239 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 240 {
 241         lockdep_assert_held(&mvm->mutex);
 242         ctxt->ref++;
 243 }
 244
 245 /*
 246  * Send a command to modify the PHY context based on the current HW
 247  * configuration. Note that the function does not check that the configuration
 248  * changed.
 249  */
 250 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 251                              struct cfg80211_chan_def *chandef,
 252                              u8 chains_static, u8 chains_dynamic)
 253 {
 254         enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;
 255
 256         lockdep_assert_held(&mvm->mutex);
 257
 258         if (fw_has_capa(&mvm->fw->ucode_capa,
 259                         IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
 260             ctxt->channel->band != chandef->chan->band) {
 261                 int ret;
 262
 263                 /* ... remove it here ...*/
 264                 ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 265                                              chains_static, chains_dynamic,
 266                                              FW_CTXT_ACTION_REMOVE, 0);
 267                 if (ret)
 268                         return ret;
 269
 270                 /* ... and proceed to add it again */
 271                 action = FW_CTXT_ACTION_ADD;
 272         }
 273
 274         ctxt->channel = chandef->chan;
 275         return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 276                                       chains_static, chains_dynamic,
 277                                       action, 0);
 278 }
 279
 280 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 281 {
 282         lockdep_assert_held(&mvm->mutex);
 283
 284         if (WARN_ON_ONCE(!ctxt))
 285                 return;
 286
 287         ctxt->ref--;
 288 }
 289
 290 static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
 291                                      struct ieee80211_vif *vif)
 292 {
 293         unsigned long *data = _data;
 294         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 295
 296         if (!mvmvif->phy_ctxt)
 297                 return;
 298
 299         if (vif->type == NL80211_IFTYPE_STATION ||
 300             vif->type == NL80211_IFTYPE_AP)
 301                 __set_bit(mvmvif->phy_ctxt->id, data);
 302 }
 303
 304 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
 305 {
 306         unsigned long phy_ctxt_counter = 0;
 307
 308         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 309                                                    IEEE80211_IFACE_ITER_NORMAL,
 310                                                    iwl_mvm_binding_iterator,
 311                                                    &phy_ctxt_counter);
 312
 313         return hweight8(phy_ctxt_counter);
 314 }