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

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  62  *****************************************************************************/
  63
  64 #include <net/mac80211.h>
  65 #include "fw-api.h"
  66 #include "mvm.h"
  67
  68 /* Maps the driver specific channel width definition to the the fw values */
  69 static inline u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
  70 {
  71         switch (chandef->width) {
  72         case NL80211_CHAN_WIDTH_20_NOHT:
  73         case NL80211_CHAN_WIDTH_20:
  74                 return PHY_VHT_CHANNEL_MODE20;
  75         case NL80211_CHAN_WIDTH_40:
  76                 return PHY_VHT_CHANNEL_MODE40;
  77         case NL80211_CHAN_WIDTH_80:
  78                 return PHY_VHT_CHANNEL_MODE80;
  79         case NL80211_CHAN_WIDTH_160:
  80                 return PHY_VHT_CHANNEL_MODE160;
  81         default:
  82                 WARN(1, "Invalid channel width=%u", chandef->width);
  83                 return PHY_VHT_CHANNEL_MODE20;
  84         }
  85 }
  86
  87 /*
  88  * Maps the driver specific control channel position (relative to the center
  89  * freq) definitions to the the fw values
  90  */
  91 static inline u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
  92 {
  93         switch (chandef->chan->center_freq - chandef->center_freq1) {
  94         case -70:
  95                 return PHY_VHT_CTRL_POS_4_BELOW;
  96         case -50:
  97                 return PHY_VHT_CTRL_POS_3_BELOW;
  98         case -30:
  99                 return PHY_VHT_CTRL_POS_2_BELOW;
 100         case -10:
 101                 return PHY_VHT_CTRL_POS_1_BELOW;
 102         case  10:
 103                 return PHY_VHT_CTRL_POS_1_ABOVE;
 104         case  30:
 105                 return PHY_VHT_CTRL_POS_2_ABOVE;
 106         case  50:
 107                 return PHY_VHT_CTRL_POS_3_ABOVE;
 108         case  70:
 109                 return PHY_VHT_CTRL_POS_4_ABOVE;
 110         default:
 111                 WARN(1, "Invalid channel definition");
 112         case 0:
 113                 /*
 114                  * The FW is expected to check the control channel position only
 115                  * when in HT/VHT and the channel width is not 20MHz. Return
 116                  * this value as the default one.
 117                  */
 118                 return PHY_VHT_CTRL_POS_1_BELOW;
 119         }
 120 }
 121
 122 /*
 123  * Construct the generic fields of the PHY context command
 124  */
 125 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
 126                                      struct iwl_phy_context_cmd *cmd,
 127                                      u32 action, u32 apply_time)
 128 {
 129         memset(cmd, 0, sizeof(struct iwl_phy_context_cmd));
 130
 131         cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
 132                                                             ctxt->color));
 133         cmd->action = cpu_to_le32(action);
 134         cmd->apply_time = cpu_to_le32(apply_time);
 135 }
 136
 137 /*
 138  * Add the phy configuration to the PHY context command
 139  */
 140 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
 141                                       struct iwl_phy_context_cmd *cmd,
 142                                       struct cfg80211_chan_def *chandef,
 143                                       u8 chains_static, u8 chains_dynamic)
 144 {
 145         u8 active_cnt, idle_cnt;
 146
 147         /* Set the channel info data */
 148         cmd->ci.band = (chandef->chan->band == IEEE80211_BAND_2GHZ ?
 149               PHY_BAND_24 : PHY_BAND_5);
 150
 151         cmd->ci.channel = chandef->chan->hw_value;
 152         cmd->ci.width = iwl_mvm_get_channel_width(chandef);
 153         cmd->ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);
 154
 155         /* Set rx the chains */
 156
 157         /* TODO:
 158          * Need to add on chain noise calibration limitations, and
 159          * BT coex considerations.
 160          */
 161         idle_cnt = chains_static;
 162         active_cnt = chains_dynamic;
 163
 164         cmd->rxchain_info = cpu_to_le32(iwl_fw_valid_rx_ant(mvm->fw) <<
 165                                         PHY_RX_CHAIN_VALID_POS);
 166         cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
 167         cmd->rxchain_info |= cpu_to_le32(active_cnt <<
 168                                          PHY_RX_CHAIN_MIMO_CNT_POS);
 169
 170         cmd->txchain_info = cpu_to_le32(iwl_fw_valid_tx_ant(mvm->fw));
 171 }
 172
 173 /*
 174  * Send a command to apply the current phy configuration. The command is send
 175  * only if something in the configuration changed: in case that this is the
 176  * first time that the phy configuration is applied or in case that the phy
 177  * configuration changed from the previous apply.
 178  */
 179 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
 180                                   struct iwl_mvm_phy_ctxt *ctxt,
 181                                   struct cfg80211_chan_def *chandef,
 182                                   u8 chains_static, u8 chains_dynamic,
 183                                   u32 action, u32 apply_time)
 184 {
 185         struct iwl_phy_context_cmd cmd;
 186         int ret;
 187
 188         /* Set the command header fields */
 189         iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);
 190
 191         /* Set the command data */
 192         iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
 193                                   chains_static, chains_dynamic);
 194
 195         ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, CMD_SYNC,
 196                                    sizeof(struct iwl_phy_context_cmd),
 197                                    &cmd);
 198         if (ret)
 199                 IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
 200         return ret;
 201 }
 202
 203
 204 struct phy_ctx_used_data {
 205         unsigned long used[BITS_TO_LONGS(NUM_PHY_CTX)];
 206 };
 207
 208 static void iwl_mvm_phy_ctx_used_iter(struct ieee80211_hw *hw,
 209                                       struct ieee80211_chanctx_conf *ctx,
 210                                       void *_data)
 211 {
 212         struct phy_ctx_used_data *data = _data;
 213         struct iwl_mvm_phy_ctxt *phy_ctxt = (void *)ctx->drv_priv;
 214
 215         __set_bit(phy_ctxt->id, data->used);
 216 }
 217
 218 /*
 219  * Send a command to add a PHY context based on the current HW configuration.
 220  */
 221 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 222                          struct cfg80211_chan_def *chandef,
 223                          u8 chains_static, u8 chains_dynamic)
 224 {
 225         struct phy_ctx_used_data data = {
 226                 .used = { },
 227         };
 228
 229         /*
 230          * If this is a regular PHY context (not the ROC one)
 231          * skip the ROC PHY context's ID.
 232          */
 233         if (ctxt != &mvm->phy_ctxt_roc)
 234                 __set_bit(mvm->phy_ctxt_roc.id, data.used);
 235
 236         lockdep_assert_held(&mvm->mutex);
 237         ctxt->color++;
 238
 239         if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
 240                 ieee80211_iter_chan_contexts_atomic(
 241                         mvm->hw, iwl_mvm_phy_ctx_used_iter, &data);
 242
 243                 ctxt->id = find_first_zero_bit(data.used, NUM_PHY_CTX);
 244                 if (WARN_ONCE(ctxt->id == NUM_PHY_CTX,
 245                               "Failed to init PHY context - no free ID!\n"))
 246                         return -EIO;
 247         }
 248
 249         ctxt->channel = chandef->chan;
 250         return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 251                                       chains_static, chains_dynamic,
 252                                       FW_CTXT_ACTION_ADD, 0);
 253 }
 254
 255 /*
 256  * Send a command to modify the PHY context based on the current HW
 257  * configuration. Note that the function does not check that the configuration
 258  * changed.
 259  */
 260 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 261                              struct cfg80211_chan_def *chandef,
 262                              u8 chains_static, u8 chains_dynamic)
 263 {
 264         lockdep_assert_held(&mvm->mutex);
 265
 266         ctxt->channel = chandef->chan;
 267         return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 268                                       chains_static, chains_dynamic,
 269                                       FW_CTXT_ACTION_MODIFY, 0);
 270 }
 271
 272 /*
 273  * Send a command to the FW to remove the given phy context.
 274  * Once the command is sent, regardless of success or failure, the context is
 275  * marked as invalid
 276  */
 277 void iwl_mvm_phy_ctxt_remove(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 278 {
 279         struct iwl_phy_context_cmd cmd;
 280         int ret;
 281
 282         lockdep_assert_held(&mvm->mutex);
 283
 284         iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, FW_CTXT_ACTION_REMOVE, 0);
 285         ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, CMD_SYNC,
 286                                    sizeof(struct iwl_phy_context_cmd),
 287                                    &cmd);
 288         if (ret)
 289                 IWL_ERR(mvm, "Failed to send PHY remove: ctxt id=%d\n",
 290                         ctxt->id);
 291 }