1 /******************************************************************************
2 *
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.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
10 * Copyright(c) 2017 Intel Deutschland GmbH
11 * Copyright(c) 2018 Intel Corporation
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of version 2 of the GNU General Public License as
15 * published by the Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * The full GNU General Public License is included in this distribution
23 * in the file called COPYING.
24 *
25 * Contact Information:
26 * Intel Linux Wireless <linuxwifi@intel.com>
27 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
28 *
29 * BSD LICENSE
30 *
31 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
32 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
33 * Copyright(c) 2018 Intel Corporation
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 *
40 * * Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * * Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
45 * distribution.
46 * * Neither the name Intel Corporation nor the names of its
47 * contributors may be used to endorse or promote products derived
48 * from this software without specific prior written permission.
49 *
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
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 fw values */
69 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 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 /* fall through */
113 case 0:
114 /*
115 * The FW is expected to check the control channel position only
116 * when in HT/VHT and the channel width is not 20MHz. Return
117 * this value as the default one.
118 */
119 return PHY_VHT_CTRL_POS_1_BELOW;
120 }
121 }
122
123 /*
124 * Construct the generic fields of the PHY context command
125 */
126 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
127 struct iwl_phy_context_cmd *cmd,
128 u32 action, u32 apply_time)
129 {
130 memset(cmd, 0, sizeof(struct iwl_phy_context_cmd));
131
132 cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
133 ctxt->color));
134 cmd->action = cpu_to_le32(action);
135 cmd->apply_time = cpu_to_le32(apply_time);
136 }
137
138 /*
139 * Add the phy configuration to the PHY context command
140 */
141 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
142 struct iwl_phy_context_cmd *cmd,
143 struct cfg80211_chan_def *chandef,
144 u8 chains_static, u8 chains_dynamic)
145 {
146 u8 active_cnt, idle_cnt;
147 struct iwl_phy_context_cmd_tail *tail =
148 iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);
149
150 /* Set the channel info data */
151 iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);
152
153 /* Set rx the chains */
154 idle_cnt = chains_static;
155 active_cnt = chains_dynamic;
156
157 /* In scenarios where we only ever use a single-stream rates,
158 * i.e. legacy 11b/g/a associations, single-stream APs or even
159 * static SMPS, enable both chains to get diversity, improving
160 * the case where we're far enough from the AP that attenuation
161 * between the two antennas is sufficiently different to impact
162 * performance.
163 */
164 if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm)) {
165 idle_cnt = 2;
166 active_cnt = 2;
167 }
168
169 tail->rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
170 PHY_RX_CHAIN_VALID_POS);
171 tail->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
172 tail->rxchain_info |= cpu_to_le32(active_cnt <<
173 PHY_RX_CHAIN_MIMO_CNT_POS);
174 #ifdef CONFIG_IWLWIFI_DEBUGFS
175 if (unlikely(mvm->dbgfs_rx_phyinfo))
176 tail->rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
177 #endif
178
179 tail->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 u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);
197
198 /* Set the command header fields */
199 iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);
200
201 /* Set the command data */
202 iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
203 chains_static, chains_dynamic);
204
205 ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 0, len, &cmd);
206 if (ret)
207 IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
208 return ret;
209 }
210
211 /*
212 * Send a command to add a PHY context based on the current HW configuration.
213 */
214 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
215 struct cfg80211_chan_def *chandef,
216 u8 chains_static, u8 chains_dynamic)
217 {
218 WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
219 ctxt->ref);
220 lockdep_assert_held(&mvm->mutex);
221
222 ctxt->channel = chandef->chan;
223
224 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
225 chains_static, chains_dynamic,
226 FW_CTXT_ACTION_ADD, 0);
227 }
228
229 /*
230 * Update the number of references to the given PHY context. This is valid only
231 * in case the PHY context was already created, i.e., its reference count > 0.
232 */
233 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
234 {
235 lockdep_assert_held(&mvm->mutex);
236 ctxt->ref++;
237 }
238
239 /*
240 * Send a command to modify the PHY context based on the current HW
241 * configuration. Note that the function does not check that the configuration
242 * changed.
243 */
244 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
245 struct cfg80211_chan_def *chandef,
246 u8 chains_static, u8 chains_dynamic)
247 {
248 enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;
249
250 lockdep_assert_held(&mvm->mutex);
251
252 if (fw_has_capa(&mvm->fw->ucode_capa,
253 IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
254 ctxt->channel->band != chandef->chan->band) {
255 int ret;
256
257 /* ... remove it here ...*/
258 ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
259 chains_static, chains_dynamic,
260 FW_CTXT_ACTION_REMOVE, 0);
261 if (ret)
262 return ret;
263
264 /* ... and proceed to add it again */
265 action = FW_CTXT_ACTION_ADD;
266 }
267
268 ctxt->channel = chandef->chan;
269 ctxt->width = chandef->width;
270 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
271 chains_static, chains_dynamic,
272 action, 0);
273 }
274
275 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
276 {
277 lockdep_assert_held(&mvm->mutex);
278
279 if (WARN_ON_ONCE(!ctxt))
280 return;
281
282 ctxt->ref--;
283
284 /*
285 * Move unused phy's to a default channel. When the phy is moved the,
286 * fw will cleanup immediate quiet bit if it was previously set,
287 * otherwise we might not be able to reuse this phy.
288 */
289 if (ctxt->ref == 0) {
290 struct ieee80211_channel *chan;
291 struct cfg80211_chan_def chandef;
292 struct ieee80211_supported_band *sband = NULL;
293 enum nl80211_band band = NL80211_BAND_2GHZ;
294
295 while (!sband && band < NUM_NL80211_BANDS)
296 sband = mvm->hw->wiphy->bands[band++];
297
298 if (WARN_ON(!sband))
299 return;
300
301 chan = &sband->channels[0];
302
303 cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
304 iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
305 }
306 }
307
308 static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
309 struct ieee80211_vif *vif)
310 {
311 unsigned long *data = _data;
312 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
313
314 if (!mvmvif->phy_ctxt)
315 return;
316
317 if (vif->type == NL80211_IFTYPE_STATION ||
318 vif->type == NL80211_IFTYPE_AP)
319 __set_bit(mvmvif->phy_ctxt->id, data);
320 }
321
322 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
323 {
324 unsigned long phy_ctxt_counter = 0;
325
326 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
327 IEEE80211_IFACE_ITER_NORMAL,
328 iwl_mvm_binding_iterator,
329 &phy_ctxt_counter);
330
331 return hweight8(phy_ctxt_counter);
332 }