drivers/net/wireless/mediatek/mt7601u/main.c

   1 /*
   2  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "mt7601u.h"
  16 #include "mac.h"
  17 #include <linux/etherdevice.h>
  18 #include <linux/version.h>
  19
  20 static int mt7601u_start(struct ieee80211_hw *hw)
  21 {
  22         struct mt7601u_dev *dev = hw->priv;
  23         int ret;
  24
  25         mutex_lock(&dev->mutex);
  26
  27         ret = mt7601u_mac_start(dev);
  28         if (ret)
  29                 goto out;
  30
  31         ieee80211_queue_delayed_work(dev->hw, &dev->mac_work,
  32                                      MT_CALIBRATE_INTERVAL);
  33         ieee80211_queue_delayed_work(dev->hw, &dev->cal_work,
  34                                      MT_CALIBRATE_INTERVAL);
  35 out:
  36         mutex_unlock(&dev->mutex);
  37         return ret;
  38 }
  39
  40 static void mt7601u_stop(struct ieee80211_hw *hw)
  41 {
  42         struct mt7601u_dev *dev = hw->priv;
  43
  44         mutex_lock(&dev->mutex);
  45
  46         cancel_delayed_work_sync(&dev->cal_work);
  47         cancel_delayed_work_sync(&dev->mac_work);
  48         mt7601u_mac_stop(dev);
  49
  50         mutex_unlock(&dev->mutex);
  51 }
  52
  53 static int mt7601u_add_interface(struct ieee80211_hw *hw,
  54                                  struct ieee80211_vif *vif)
  55 {
  56         struct mt7601u_dev *dev = hw->priv;
  57         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
  58         unsigned int idx = 0;
  59         unsigned int wcid = GROUP_WCID(idx);
  60
  61         /* Note: for AP do the AP-STA things mt76 does:
  62          *      - beacon offsets
  63          *      - do mac address tricks
  64          *      - shift vif idx
  65          */
  66         mvif->idx = idx;
  67
  68         if (dev->wcid_mask[wcid / BITS_PER_LONG] & BIT(wcid % BITS_PER_LONG))
  69                 return -ENOSPC;
  70         dev->wcid_mask[wcid / BITS_PER_LONG] |= BIT(wcid % BITS_PER_LONG);
  71         mvif->group_wcid.idx = wcid;
  72         mvif->group_wcid.hw_key_idx = -1;
  73
  74         return 0;
  75 }
  76
  77 static void mt7601u_remove_interface(struct ieee80211_hw *hw,
  78                                      struct ieee80211_vif *vif)
  79 {
  80         struct mt7601u_dev *dev = hw->priv;
  81         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
  82         unsigned int wcid = mvif->group_wcid.idx;
  83
  84         dev->wcid_mask[wcid / BITS_PER_LONG] &= ~BIT(wcid % BITS_PER_LONG);
  85 }
  86
  87 static int mt7601u_config(struct ieee80211_hw *hw, u32 changed)
  88 {
  89         struct mt7601u_dev *dev = hw->priv;
  90         int ret = 0;
  91
  92         mutex_lock(&dev->mutex);
  93
  94         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
  95                 ieee80211_stop_queues(hw);
  96                 ret = mt7601u_phy_set_channel(dev, &hw->conf.chandef);
  97                 ieee80211_wake_queues(hw);
  98         }
  99
 100         mutex_unlock(&dev->mutex);
 101
 102         return ret;
 103 }
 104
 105 static void
 106 mt76_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags,
 107                       unsigned int *total_flags, u64 multicast)
 108 {
 109         struct mt7601u_dev *dev = hw->priv;
 110         u32 flags = 0;
 111
 112 #define MT76_FILTER(_flag, _hw) do { \
 113                 flags |= *total_flags & FIF_##_flag;                    \
 114                 dev->rxfilter &= ~(_hw);                                \
 115                 dev->rxfilter |= !(flags & FIF_##_flag) * (_hw);        \
 116         } while (0)
 117
 118         mutex_lock(&dev->mutex);
 119
 120         dev->rxfilter &= ~MT_RX_FILTR_CFG_OTHER_BSS;
 121
 122         MT76_FILTER(OTHER_BSS, MT_RX_FILTR_CFG_PROMISC);
 123         MT76_FILTER(FCSFAIL, MT_RX_FILTR_CFG_CRC_ERR);
 124         MT76_FILTER(PLCPFAIL, MT_RX_FILTR_CFG_PHY_ERR);
 125         MT76_FILTER(CONTROL, MT_RX_FILTR_CFG_ACK |
 126                              MT_RX_FILTR_CFG_CTS |
 127                              MT_RX_FILTR_CFG_CFEND |
 128                              MT_RX_FILTR_CFG_CFACK |
 129                              MT_RX_FILTR_CFG_BA |
 130                              MT_RX_FILTR_CFG_CTRL_RSV);
 131         MT76_FILTER(PSPOLL, MT_RX_FILTR_CFG_PSPOLL);
 132
 133         *total_flags = flags;
 134         mt76_wr(dev, MT_RX_FILTR_CFG, dev->rxfilter);
 135
 136         mutex_unlock(&dev->mutex);
 137 }
 138
 139 static void
 140 mt7601u_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 141                          struct ieee80211_bss_conf *info, u32 changed)
 142 {
 143         struct mt7601u_dev *dev = hw->priv;
 144
 145         mutex_lock(&dev->mutex);
 146
 147         if (changed & BSS_CHANGED_ASSOC)
 148                 mt7601u_phy_con_cal_onoff(dev, info);
 149
 150         if (changed & BSS_CHANGED_BSSID) {
 151                 mt7601u_addr_wr(dev, MT_MAC_BSSID_DW0, info->bssid);
 152
 153                 /* Note: this is a hack because beacon_int is not changed
 154                  *       on leave nor is any more appropriate event generated.
 155                  *       rt2x00 doesn't seem to be bothered though.
 156                  */
 157                 if (is_zero_ether_addr(info->bssid))
 158                         mt7601u_mac_config_tsf(dev, false, 0);
 159         }
 160
 161         if (changed & BSS_CHANGED_BASIC_RATES) {
 162                 mt7601u_wr(dev, MT_LEGACY_BASIC_RATE, info->basic_rates);
 163                 mt7601u_wr(dev, MT_HT_FBK_CFG0, 0x65432100);
 164                 mt7601u_wr(dev, MT_HT_FBK_CFG1, 0xedcba980);
 165                 mt7601u_wr(dev, MT_LG_FBK_CFG0, 0xedcba988);
 166                 mt7601u_wr(dev, MT_LG_FBK_CFG1, 0x00002100);
 167         }
 168
 169         if (changed & BSS_CHANGED_BEACON_INT)
 170                 mt7601u_mac_config_tsf(dev, true, info->beacon_int);
 171
 172         if (changed & BSS_CHANGED_HT || changed & BSS_CHANGED_ERP_CTS_PROT)
 173                 mt7601u_mac_set_protection(dev, info->use_cts_prot,
 174                                            info->ht_operation_mode);
 175
 176         if (changed & BSS_CHANGED_ERP_PREAMBLE)
 177                 mt7601u_mac_set_short_preamble(dev, info->use_short_preamble);
 178
 179         if (changed & BSS_CHANGED_ERP_SLOT) {
 180                 int slottime = info->use_short_slot ? 9 : 20;
 181
 182                 mt76_rmw_field(dev, MT_BKOFF_SLOT_CFG,
 183                                MT_BKOFF_SLOT_CFG_SLOTTIME, slottime);
 184         }
 185
 186         if (changed & BSS_CHANGED_ASSOC)
 187                 mt7601u_phy_recalibrate_after_assoc(dev);
 188
 189         mutex_unlock(&dev->mutex);
 190 }
 191
 192 static int
 193 mt76_wcid_alloc(struct mt7601u_dev *dev)
 194 {
 195         int i, idx = 0;
 196
 197         for (i = 0; i < ARRAY_SIZE(dev->wcid_mask); i++) {
 198                 idx = ffs(~dev->wcid_mask[i]);
 199                 if (!idx)
 200                         continue;
 201
 202                 idx--;
 203                 dev->wcid_mask[i] |= BIT(idx);
 204                 break;
 205         }
 206
 207         idx = i * BITS_PER_LONG + idx;
 208         if (idx > 119)
 209                 return -1;
 210
 211         return idx;
 212 }
 213
 214 static int
 215 mt7601u_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 216                 struct ieee80211_sta *sta)
 217 {
 218         struct mt7601u_dev *dev = hw->priv;
 219         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 220         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
 221         int ret = 0;
 222         int idx = 0;
 223
 224         mutex_lock(&dev->mutex);
 225
 226         idx = mt76_wcid_alloc(dev);
 227         if (idx < 0) {
 228                 ret = -ENOSPC;
 229                 goto out;
 230         }
 231
 232         msta->wcid.idx = idx;
 233         msta->wcid.hw_key_idx = -1;
 234         mt7601u_mac_wcid_setup(dev, idx, mvif->idx, sta->addr);
 235         mt76_clear(dev, MT_WCID_DROP(idx), MT_WCID_DROP_MASK(idx));
 236         rcu_assign_pointer(dev->wcid[idx], &msta->wcid);
 237         mt7601u_mac_set_ampdu_factor(dev);
 238
 239 out:
 240         mutex_unlock(&dev->mutex);
 241
 242         return ret;
 243 }
 244
 245 static int
 246 mt7601u_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 247                    struct ieee80211_sta *sta)
 248 {
 249         struct mt7601u_dev *dev = hw->priv;
 250         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 251         int idx = msta->wcid.idx;
 252
 253         mutex_lock(&dev->mutex);
 254         rcu_assign_pointer(dev->wcid[idx], NULL);
 255         mt76_set(dev, MT_WCID_DROP(idx), MT_WCID_DROP_MASK(idx));
 256         dev->wcid_mask[idx / BITS_PER_LONG] &= ~BIT(idx % BITS_PER_LONG);
 257         mt7601u_mac_wcid_setup(dev, idx, 0, NULL);
 258         mt7601u_mac_set_ampdu_factor(dev);
 259         mutex_unlock(&dev->mutex);
 260
 261         return 0;
 262 }
 263
 264 static void
 265 mt7601u_sta_notify(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 266                    enum sta_notify_cmd cmd, struct ieee80211_sta *sta)
 267 {
 268 }
 269
 270 static void
 271 mt7601u_sw_scan(struct ieee80211_hw *hw,
 272                 struct ieee80211_vif *vif,
 273                 const u8 *mac_addr)
 274 {
 275         struct mt7601u_dev *dev = hw->priv;
 276
 277         mt7601u_agc_save(dev);
 278         set_bit(MT7601U_STATE_SCANNING, &dev->state);
 279 }
 280
 281 static void
 282 mt7601u_sw_scan_complete(struct ieee80211_hw *hw,
 283                          struct ieee80211_vif *vif)
 284 {
 285         struct mt7601u_dev *dev = hw->priv;
 286
 287         mt7601u_agc_restore(dev);
 288         clear_bit(MT7601U_STATE_SCANNING, &dev->state);
 289 }
 290
 291 static int
 292 mt7601u_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 293                 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 294                 struct ieee80211_key_conf *key)
 295 {
 296         struct mt7601u_dev *dev = hw->priv;
 297         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
 298         struct mt76_sta *msta = sta ? (struct mt76_sta *) sta->drv_priv : NULL;
 299         struct mt76_wcid *wcid = msta ? &msta->wcid : &mvif->group_wcid;
 300         int idx = key->keyidx;
 301         int ret;
 302
 303         if (cmd == SET_KEY) {
 304                 key->hw_key_idx = wcid->idx;
 305                 wcid->hw_key_idx = idx;
 306         } else {
 307                 if (idx == wcid->hw_key_idx)
 308                         wcid->hw_key_idx = -1;
 309
 310                 key = NULL;
 311         }
 312
 313         if (!msta) {
 314                 if (key || wcid->hw_key_idx == idx) {
 315                         ret = mt76_mac_wcid_set_key(dev, wcid->idx, key);
 316                         if (ret)
 317                                 return ret;
 318                 }
 319
 320                 return mt76_mac_shared_key_setup(dev, mvif->idx, idx, key);
 321         }
 322
 323         return mt76_mac_wcid_set_key(dev, msta->wcid.idx, key);
 324 }
 325
 326 static int mt7601u_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
 327 {
 328         struct mt7601u_dev *dev = hw->priv;
 329
 330         mt76_rmw_field(dev, MT_TX_RTS_CFG, MT_TX_RTS_CFG_THRESH, value);
 331
 332         return 0;
 333 }
 334
 335 static int
 336 mt76_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 337                   struct ieee80211_ampdu_params *params)
 338 {
 339         struct mt7601u_dev *dev = hw->priv;
 340         struct ieee80211_sta *sta = params->sta;
 341         enum ieee80211_ampdu_mlme_action action = params->action;
 342         u16 tid = params->tid;
 343         u16 *ssn = &params->ssn;
 344         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 345
 346         WARN_ON(msta->wcid.idx > GROUP_WCID(0));
 347
 348         switch (action) {
 349         case IEEE80211_AMPDU_RX_START:
 350                 mt76_set(dev, MT_WCID_ADDR(msta->wcid.idx) + 4, BIT(16 + tid));
 351                 break;
 352         case IEEE80211_AMPDU_RX_STOP:
 353                 mt76_clear(dev, MT_WCID_ADDR(msta->wcid.idx) + 4,
 354                            BIT(16 + tid));
 355                 break;
 356         case IEEE80211_AMPDU_TX_OPERATIONAL:
 357                 ieee80211_send_bar(vif, sta->addr, tid, msta->agg_ssn[tid]);
 358                 break;
 359         case IEEE80211_AMPDU_TX_STOP_FLUSH:
 360         case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
 361                 break;
 362         case IEEE80211_AMPDU_TX_START:
 363                 msta->agg_ssn[tid] = *ssn << 4;
 364                 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 365                 break;
 366         case IEEE80211_AMPDU_TX_STOP_CONT:
 367                 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 368                 break;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static void
 375 mt76_sta_rate_tbl_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 376                          struct ieee80211_sta *sta)
 377 {
 378         struct mt7601u_dev *dev = hw->priv;
 379         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 380         struct ieee80211_sta_rates *rates;
 381         struct ieee80211_tx_rate rate = {};
 382
 383         rcu_read_lock();
 384         rates = rcu_dereference(sta->rates);
 385
 386         if (!rates)
 387                 goto out;
 388
 389         rate.idx = rates->rate[0].idx;
 390         rate.flags = rates->rate[0].flags;
 391         mt76_mac_wcid_set_rate(dev, &msta->wcid, &rate);
 392
 393 out:
 394         rcu_read_unlock();
 395 }
 396
 397 const struct ieee80211_ops mt7601u_ops = {
 398         .tx = mt7601u_tx,
 399         .start = mt7601u_start,
 400         .stop = mt7601u_stop,
 401         .add_interface = mt7601u_add_interface,
 402         .remove_interface = mt7601u_remove_interface,
 403         .config = mt7601u_config,
 404         .configure_filter = mt76_configure_filter,
 405         .bss_info_changed = mt7601u_bss_info_changed,
 406         .sta_add = mt7601u_sta_add,
 407         .sta_remove = mt7601u_sta_remove,
 408         .sta_notify = mt7601u_sta_notify,
 409         .set_key = mt7601u_set_key,
 410         .conf_tx = mt7601u_conf_tx,
 411         .sw_scan_start = mt7601u_sw_scan,
 412         .sw_scan_complete = mt7601u_sw_scan_complete,
 413         .ampdu_action = mt76_ampdu_action,
 414         .sta_rate_tbl_update = mt76_sta_rate_tbl_update,
 415         .set_rts_threshold = mt7601u_set_rts_threshold,
 416 };