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

   1 /******************************************************************************
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   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
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   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
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  33  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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  36  * Redistribution and use in source and binary forms, with or without
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  48  *    from this software without specific prior written permission.
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  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  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         idle_cnt = chains_static;
 157         active_cnt = chains_dynamic;
 158
 159         cmd->rxchain_info = cpu_to_le32(iwl_fw_valid_rx_ant(mvm->fw) <<
 160                                         PHY_RX_CHAIN_VALID_POS);
 161         cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
 162         cmd->rxchain_info |= cpu_to_le32(active_cnt <<
 163                                          PHY_RX_CHAIN_MIMO_CNT_POS);
 164
 165         cmd->txchain_info = cpu_to_le32(iwl_fw_valid_tx_ant(mvm->fw));
 166 }
 167
 168 /*
 169  * Send a command to apply the current phy configuration. The command is send
 170  * only if something in the configuration changed: in case that this is the
 171  * first time that the phy configuration is applied or in case that the phy
 172  * configuration changed from the previous apply.
 173  */
 174 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
 175                                   struct iwl_mvm_phy_ctxt *ctxt,
 176                                   struct cfg80211_chan_def *chandef,
 177                                   u8 chains_static, u8 chains_dynamic,
 178                                   u32 action, u32 apply_time)
 179 {
 180         struct iwl_phy_context_cmd cmd;
 181         int ret;
 182
 183         /* Set the command header fields */
 184         iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);
 185
 186         /* Set the command data */
 187         iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
 188                                   chains_static, chains_dynamic);
 189
 190         ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, CMD_SYNC,
 191                                    sizeof(struct iwl_phy_context_cmd),
 192                                    &cmd);
 193         if (ret)
 194                 IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
 195         return ret;
 196 }
 197
 198 /*
 199  * Send a command to add a PHY context based on the current HW configuration.
 200  */
 201 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 202                          struct cfg80211_chan_def *chandef,
 203                          u8 chains_static, u8 chains_dynamic)
 204 {
 205         int ret;
 206
 207         WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
 208                 ctxt->ref);
 209         lockdep_assert_held(&mvm->mutex);
 210
 211         ctxt->channel = chandef->chan;
 212         ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 213                                      chains_static, chains_dynamic,
 214                                      FW_CTXT_ACTION_ADD, 0);
 215
 216         return ret;
 217 }
 218
 219 /*
 220  * Update the number of references to the given PHY context. This is valid only
 221  * in case the PHY context was already created, i.e., its reference count > 0.
 222  */
 223 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 224 {
 225         lockdep_assert_held(&mvm->mutex);
 226         ctxt->ref++;
 227 }
 228
 229 /*
 230  * Send a command to modify the PHY context based on the current HW
 231  * configuration. Note that the function does not check that the configuration
 232  * changed.
 233  */
 234 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 235                              struct cfg80211_chan_def *chandef,
 236                              u8 chains_static, u8 chains_dynamic)
 237 {
 238         lockdep_assert_held(&mvm->mutex);
 239
 240         ctxt->channel = chandef->chan;
 241         return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 242                                       chains_static, chains_dynamic,
 243                                       FW_CTXT_ACTION_MODIFY, 0);
 244 }
 245
 246 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 247 {
 248         lockdep_assert_held(&mvm->mutex);
 249
 250         if (WARN_ON_ONCE(!ctxt))
 251                 return;
 252
 253         ctxt->ref--;
 254 }