1 /******************************************************************************
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.
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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.
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.
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,
24 * The full GNU General Public License is included in this distribution
25 * in the file called COPYING.
27 * Contact Information:
28 * Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
33 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
34 * All rights reserved.
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37 * modification, are permitted provided that the following conditions
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48 * from this software without specific prior written permission.
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60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 *****************************************************************************/
64 #include <net/mac80211.h>
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)
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;
82 WARN(1, "Invalid channel width=%u", chandef->width);
83 return PHY_VHT_CHANNEL_MODE20;
88 * Maps the driver specific control channel position (relative to the center
89 * freq) definitions to the the fw values
91 static inline u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
93 switch (chandef->chan->center_freq - chandef->center_freq1) {
95 return PHY_VHT_CTRL_POS_4_BELOW;
97 return PHY_VHT_CTRL_POS_3_BELOW;
99 return PHY_VHT_CTRL_POS_2_BELOW;
101 return PHY_VHT_CTRL_POS_1_BELOW;
103 return PHY_VHT_CTRL_POS_1_ABOVE;
105 return PHY_VHT_CTRL_POS_2_ABOVE;
107 return PHY_VHT_CTRL_POS_3_ABOVE;
109 return PHY_VHT_CTRL_POS_4_ABOVE;
111 WARN(1, "Invalid channel definition");
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.
118 return PHY_VHT_CTRL_POS_1_BELOW;
123 * Construct the generic fields of the PHY context command
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)
129 memset(cmd, 0, sizeof(struct iwl_phy_context_cmd));
131 cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
133 cmd->action = cpu_to_le32(action);
134 cmd->apply_time = cpu_to_le32(apply_time);
138 * Add the phy configuration to the PHY context command
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)
145 u8 active_cnt, idle_cnt;
147 /* Set the channel info data */
148 cmd->ci.band = (chandef->chan->band == IEEE80211_BAND_2GHZ ?
149 PHY_BAND_24 : PHY_BAND_5);
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);
155 /* Set rx the chains */
156 idle_cnt = chains_static;
157 active_cnt = chains_dynamic;
159 /* In scenarios where we only ever use a single-stream rates,
160 * i.e. legacy 11b/g/a associations, single-stream APs or even
161 * static SMPS, enable both chains to get diversity, improving
162 * the case where we're far enough from the AP that attenuation
163 * between the two antennas is sufficiently different to impact
166 if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm)) {
171 cmd->rxchain_info = cpu_to_le32(mvm->fw->valid_rx_ant <<
172 PHY_RX_CHAIN_VALID_POS);
173 cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
174 cmd->rxchain_info |= cpu_to_le32(active_cnt <<
175 PHY_RX_CHAIN_MIMO_CNT_POS);
177 cmd->txchain_info = cpu_to_le32(mvm->fw->valid_tx_ant);
181 * Send a command to apply the current phy configuration. The command is send
182 * only if something in the configuration changed: in case that this is the
183 * first time that the phy configuration is applied or in case that the phy
184 * configuration changed from the previous apply.
186 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
187 struct iwl_mvm_phy_ctxt *ctxt,
188 struct cfg80211_chan_def *chandef,
189 u8 chains_static, u8 chains_dynamic,
190 u32 action, u32 apply_time)
192 struct iwl_phy_context_cmd cmd;
195 /* Set the command header fields */
196 iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);
198 /* Set the command data */
199 iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
200 chains_static, chains_dynamic);
202 ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 0,
203 sizeof(struct iwl_phy_context_cmd),
206 IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
211 * Send a command to add a PHY context based on the current HW configuration.
213 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
214 struct cfg80211_chan_def *chandef,
215 u8 chains_static, u8 chains_dynamic)
217 WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
219 lockdep_assert_held(&mvm->mutex);
221 ctxt->channel = chandef->chan;
223 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
224 chains_static, chains_dynamic,
225 FW_CTXT_ACTION_ADD, 0);
229 * Update the number of references to the given PHY context. This is valid only
230 * in case the PHY context was already created, i.e., its reference count > 0.
232 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
234 lockdep_assert_held(&mvm->mutex);
239 * Send a command to modify the PHY context based on the current HW
240 * configuration. Note that the function does not check that the configuration
243 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
244 struct cfg80211_chan_def *chandef,
245 u8 chains_static, u8 chains_dynamic)
247 lockdep_assert_held(&mvm->mutex);
249 ctxt->channel = chandef->chan;
250 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
251 chains_static, chains_dynamic,
252 FW_CTXT_ACTION_MODIFY, 0);
255 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
257 lockdep_assert_held(&mvm->mutex);
259 if (WARN_ON_ONCE(!ctxt))