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

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  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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  64  *****************************************************************************/
  65
  66 #include <net/mac80211.h>
  67 #include "fw-api.h"
  68 #include "mvm.h"
  69
  70 /* Maps the driver specific channel width definition to the the fw values */
  71 u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
  72 {
  73         switch (chandef->width) {
  74         case NL80211_CHAN_WIDTH_20_NOHT:
  75         case NL80211_CHAN_WIDTH_20:
  76                 return PHY_VHT_CHANNEL_MODE20;
  77         case NL80211_CHAN_WIDTH_40:
  78                 return PHY_VHT_CHANNEL_MODE40;
  79         case NL80211_CHAN_WIDTH_80:
  80                 return PHY_VHT_CHANNEL_MODE80;
  81         case NL80211_CHAN_WIDTH_160:
  82                 return PHY_VHT_CHANNEL_MODE160;
  83         default:
  84                 WARN(1, "Invalid channel width=%u", chandef->width);
  85                 return PHY_VHT_CHANNEL_MODE20;
  86         }
  87 }
  88
  89 /*
  90  * Maps the driver specific control channel position (relative to the center
  91  * freq) definitions to the the fw values
  92  */
  93 u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
  94 {
  95         switch (chandef->chan->center_freq - chandef->center_freq1) {
  96         case -70:
  97                 return PHY_VHT_CTRL_POS_4_BELOW;
  98         case -50:
  99                 return PHY_VHT_CTRL_POS_3_BELOW;
 100         case -30:
 101                 return PHY_VHT_CTRL_POS_2_BELOW;
 102         case -10:
 103                 return PHY_VHT_CTRL_POS_1_BELOW;
 104         case  10:
 105                 return PHY_VHT_CTRL_POS_1_ABOVE;
 106         case  30:
 107                 return PHY_VHT_CTRL_POS_2_ABOVE;
 108         case  50:
 109                 return PHY_VHT_CTRL_POS_3_ABOVE;
 110         case  70:
 111                 return PHY_VHT_CTRL_POS_4_ABOVE;
 112         default:
 113                 WARN(1, "Invalid channel definition");
 114         case 0:
 115                 /*
 116                  * The FW is expected to check the control channel position only
 117                  * when in HT/VHT and the channel width is not 20MHz. Return
 118                  * this value as the default one.
 119                  */
 120                 return PHY_VHT_CTRL_POS_1_BELOW;
 121         }
 122 }
 123
 124 /*
 125  * Construct the generic fields of the PHY context command
 126  */
 127 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
 128                                      struct iwl_phy_context_cmd *cmd,
 129                                      u32 action, u32 apply_time)
 130 {
 131         memset(cmd, 0, sizeof(struct iwl_phy_context_cmd));
 132
 133         cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
 134                                                             ctxt->color));
 135         cmd->action = cpu_to_le32(action);
 136         cmd->apply_time = cpu_to_le32(apply_time);
 137 }
 138
 139 /*
 140  * Add the phy configuration to the PHY context command
 141  */
 142 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
 143                                       struct iwl_phy_context_cmd *cmd,
 144                                       struct cfg80211_chan_def *chandef,
 145                                       u8 chains_static, u8 chains_dynamic)
 146 {
 147         u8 active_cnt, idle_cnt;
 148
 149         /* Set the channel info data */
 150         cmd->ci.band = (chandef->chan->band == IEEE80211_BAND_2GHZ ?
 151               PHY_BAND_24 : PHY_BAND_5);
 152
 153         cmd->ci.channel = chandef->chan->hw_value;
 154         cmd->ci.width = iwl_mvm_get_channel_width(chandef);
 155         cmd->ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);
 156
 157         /* Set rx the chains */
 158         idle_cnt = chains_static;
 159         active_cnt = chains_dynamic;
 160
 161         /* In scenarios where we only ever use a single-stream rates,
 162          * i.e. legacy 11b/g/a associations, single-stream APs or even
 163          * static SMPS, enable both chains to get diversity, improving
 164          * the case where we're far enough from the AP that attenuation
 165          * between the two antennas is sufficiently different to impact
 166          * performance.
 167          */
 168         if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm)) {
 169                 idle_cnt = 2;
 170                 active_cnt = 2;
 171         }
 172
 173         cmd->rxchain_info = cpu_to_le32(mvm->fw->valid_rx_ant <<
 174                                         PHY_RX_CHAIN_VALID_POS);
 175         cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
 176         cmd->rxchain_info |= cpu_to_le32(active_cnt <<
 177                                          PHY_RX_CHAIN_MIMO_CNT_POS);
 178
 179         cmd->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
 180 }
 181
 182 /*
 183  * Send a command to apply the current phy configuration. The command is send
 184  * only if something in the configuration changed: in case that this is the
 185  * first time that the phy configuration is applied or in case that the phy
 186  * configuration changed from the previous apply.
 187  */
 188 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
 189                                   struct iwl_mvm_phy_ctxt *ctxt,
 190                                   struct cfg80211_chan_def *chandef,
 191                                   u8 chains_static, u8 chains_dynamic,
 192                                   u32 action, u32 apply_time)
 193 {
 194         struct iwl_phy_context_cmd cmd;
 195         int ret;
 196
 197         /* Set the command header fields */
 198         iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);
 199
 200         /* Set the command data */
 201         iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
 202                                   chains_static, chains_dynamic);
 203
 204         ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 0,
 205                                    sizeof(struct iwl_phy_context_cmd),
 206                                    &cmd);
 207         if (ret)
 208                 IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
 209         return ret;
 210 }
 211
 212 /*
 213  * Send a command to add a PHY context based on the current HW configuration.
 214  */
 215 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 216                          struct cfg80211_chan_def *chandef,
 217                          u8 chains_static, u8 chains_dynamic)
 218 {
 219         WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
 220                 ctxt->ref);
 221         lockdep_assert_held(&mvm->mutex);
 222
 223         ctxt->channel = chandef->chan;
 224
 225         return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 226                                       chains_static, chains_dynamic,
 227                                       FW_CTXT_ACTION_ADD, 0);
 228 }
 229
 230 /*
 231  * Update the number of references to the given PHY context. This is valid only
 232  * in case the PHY context was already created, i.e., its reference count > 0.
 233  */
 234 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 235 {
 236         lockdep_assert_held(&mvm->mutex);
 237         ctxt->ref++;
 238 }
 239
 240 /*
 241  * Send a command to modify the PHY context based on the current HW
 242  * configuration. Note that the function does not check that the configuration
 243  * changed.
 244  */
 245 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 246                              struct cfg80211_chan_def *chandef,
 247                              u8 chains_static, u8 chains_dynamic)
 248 {
 249         lockdep_assert_held(&mvm->mutex);
 250
 251         ctxt->channel = chandef->chan;
 252         return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 253                                       chains_static, chains_dynamic,
 254                                       FW_CTXT_ACTION_MODIFY, 0);
 255 }
 256
 257 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 258 {
 259         lockdep_assert_held(&mvm->mutex);
 260
 261         if (WARN_ON_ONCE(!ctxt))
 262                 return;
 263
 264         ctxt->ref--;
 265 }
 266
 267 static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
 268                                      struct ieee80211_vif *vif)
 269 {
 270         unsigned long *data = _data;
 271         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 272
 273         if (!mvmvif->phy_ctxt)
 274                 return;
 275
 276         if (vif->type == NL80211_IFTYPE_STATION ||
 277             vif->type == NL80211_IFTYPE_AP)
 278                 __set_bit(mvmvif->phy_ctxt->id, data);
 279 }
 280
 281 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
 282 {
 283         unsigned long phy_ctxt_counter = 0;
 284
 285         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 286                                                    IEEE80211_IFACE_ITER_NORMAL,
 287                                                    iwl_mvm_binding_iterator,
 288                                                    &phy_ctxt_counter);
 289
 290         return hweight8(phy_ctxt_counter);
 291 }