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(FCSFAIL, MT_RX_FILTR_CFG_CRC_ERR);
 123         MT76_FILTER(PLCPFAIL, MT_RX_FILTR_CFG_PHY_ERR);
 124         MT76_FILTER(CONTROL, MT_RX_FILTR_CFG_ACK |
 125                              MT_RX_FILTR_CFG_CTS |
 126                              MT_RX_FILTR_CFG_CFEND |
 127                              MT_RX_FILTR_CFG_CFACK |
 128                              MT_RX_FILTR_CFG_BA |
 129                              MT_RX_FILTR_CFG_CTRL_RSV);
 130         MT76_FILTER(PSPOLL, MT_RX_FILTR_CFG_PSPOLL);
 131
 132         *total_flags = flags;
 133         mt76_wr(dev, MT_RX_FILTR_CFG, dev->rxfilter);
 134
 135         mutex_unlock(&dev->mutex);
 136 }
 137
 138 static void
 139 mt7601u_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 140                          struct ieee80211_bss_conf *info, u32 changed)
 141 {
 142         struct mt7601u_dev *dev = hw->priv;
 143
 144         mutex_lock(&dev->mutex);
 145
 146         if (changed & BSS_CHANGED_ASSOC)
 147                 mt7601u_phy_con_cal_onoff(dev, info);
 148
 149         if (changed & BSS_CHANGED_BSSID) {
 150                 mt7601u_addr_wr(dev, MT_MAC_BSSID_DW0, info->bssid);
 151
 152                 /* Note: this is a hack because beacon_int is not changed
 153                  *       on leave nor is any more appropriate event generated.
 154                  *       rt2x00 doesn't seem to be bothered though.
 155                  */
 156                 if (is_zero_ether_addr(info->bssid))
 157                         mt7601u_mac_config_tsf(dev, false, 0);
 158         }
 159
 160         if (changed & BSS_CHANGED_BASIC_RATES) {
 161                 mt7601u_wr(dev, MT_LEGACY_BASIC_RATE, info->basic_rates);
 162                 mt7601u_wr(dev, MT_HT_FBK_CFG0, 0x65432100);
 163                 mt7601u_wr(dev, MT_HT_FBK_CFG1, 0xedcba980);
 164                 mt7601u_wr(dev, MT_LG_FBK_CFG0, 0xedcba988);
 165                 mt7601u_wr(dev, MT_LG_FBK_CFG1, 0x00002100);
 166         }
 167
 168         if (changed & BSS_CHANGED_BEACON_INT)
 169                 mt7601u_mac_config_tsf(dev, true, info->beacon_int);
 170
 171         if (changed & BSS_CHANGED_HT || changed & BSS_CHANGED_ERP_CTS_PROT)
 172                 mt7601u_mac_set_protection(dev, info->use_cts_prot,
 173                                            info->ht_operation_mode);
 174
 175         if (changed & BSS_CHANGED_ERP_PREAMBLE)
 176                 mt7601u_mac_set_short_preamble(dev, info->use_short_preamble);
 177
 178         if (changed & BSS_CHANGED_ERP_SLOT) {
 179                 int slottime = info->use_short_slot ? 9 : 20;
 180
 181                 mt76_rmw_field(dev, MT_BKOFF_SLOT_CFG,
 182                                MT_BKOFF_SLOT_CFG_SLOTTIME, slottime);
 183         }
 184
 185         if (changed & BSS_CHANGED_ASSOC)
 186                 mt7601u_phy_recalibrate_after_assoc(dev);
 187
 188         mutex_unlock(&dev->mutex);
 189 }
 190
 191 static int
 192 mt76_wcid_alloc(struct mt7601u_dev *dev)
 193 {
 194         int i, idx = 0;
 195
 196         for (i = 0; i < ARRAY_SIZE(dev->wcid_mask); i++) {
 197                 idx = ffs(~dev->wcid_mask[i]);
 198                 if (!idx)
 199                         continue;
 200
 201                 idx--;
 202                 dev->wcid_mask[i] |= BIT(idx);
 203                 break;
 204         }
 205
 206         idx = i * BITS_PER_LONG + idx;
 207         if (idx > 119)
 208                 return -1;
 209
 210         return idx;
 211 }
 212
 213 static int
 214 mt7601u_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 215                 struct ieee80211_sta *sta)
 216 {
 217         struct mt7601u_dev *dev = hw->priv;
 218         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 219         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
 220         int ret = 0;
 221         int idx = 0;
 222
 223         mutex_lock(&dev->mutex);
 224
 225         idx = mt76_wcid_alloc(dev);
 226         if (idx < 0) {
 227                 ret = -ENOSPC;
 228                 goto out;
 229         }
 230
 231         msta->wcid.idx = idx;
 232         msta->wcid.hw_key_idx = -1;
 233         mt7601u_mac_wcid_setup(dev, idx, mvif->idx, sta->addr);
 234         mt76_clear(dev, MT_WCID_DROP(idx), MT_WCID_DROP_MASK(idx));
 235         rcu_assign_pointer(dev->wcid[idx], &msta->wcid);
 236         mt7601u_mac_set_ampdu_factor(dev);
 237
 238 out:
 239         mutex_unlock(&dev->mutex);
 240
 241         return ret;
 242 }
 243
 244 static int
 245 mt7601u_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 246                    struct ieee80211_sta *sta)
 247 {
 248         struct mt7601u_dev *dev = hw->priv;
 249         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 250         int idx = msta->wcid.idx;
 251
 252         mutex_lock(&dev->mutex);
 253         rcu_assign_pointer(dev->wcid[idx], NULL);
 254         mt76_set(dev, MT_WCID_DROP(idx), MT_WCID_DROP_MASK(idx));
 255         dev->wcid_mask[idx / BITS_PER_LONG] &= ~BIT(idx % BITS_PER_LONG);
 256         mt7601u_mac_wcid_setup(dev, idx, 0, NULL);
 257         mt7601u_mac_set_ampdu_factor(dev);
 258         mutex_unlock(&dev->mutex);
 259
 260         return 0;
 261 }
 262
 263 static void
 264 mt7601u_sta_notify(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 265                    enum sta_notify_cmd cmd, struct ieee80211_sta *sta)
 266 {
 267 }
 268
 269 static void
 270 mt7601u_sw_scan(struct ieee80211_hw *hw,
 271                 struct ieee80211_vif *vif,
 272                 const u8 *mac_addr)
 273 {
 274         struct mt7601u_dev *dev = hw->priv;
 275
 276         mt7601u_agc_save(dev);
 277         set_bit(MT7601U_STATE_SCANNING, &dev->state);
 278 }
 279
 280 static void
 281 mt7601u_sw_scan_complete(struct ieee80211_hw *hw,
 282                          struct ieee80211_vif *vif)
 283 {
 284         struct mt7601u_dev *dev = hw->priv;
 285
 286         mt7601u_agc_restore(dev);
 287         clear_bit(MT7601U_STATE_SCANNING, &dev->state);
 288 }
 289
 290 static int
 291 mt7601u_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 292                 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 293                 struct ieee80211_key_conf *key)
 294 {
 295         struct mt7601u_dev *dev = hw->priv;
 296         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
 297         struct mt76_sta *msta = sta ? (struct mt76_sta *) sta->drv_priv : NULL;
 298         struct mt76_wcid *wcid = msta ? &msta->wcid : &mvif->group_wcid;
 299         int idx = key->keyidx;
 300         int ret;
 301
 302         if (cmd == SET_KEY) {
 303                 key->hw_key_idx = wcid->idx;
 304                 wcid->hw_key_idx = idx;
 305         } else {
 306                 if (idx == wcid->hw_key_idx)
 307                         wcid->hw_key_idx = -1;
 308
 309                 key = NULL;
 310         }
 311
 312         if (!msta) {
 313                 if (key || wcid->hw_key_idx == idx) {
 314                         ret = mt76_mac_wcid_set_key(dev, wcid->idx, key);
 315                         if (ret)
 316                                 return ret;
 317                 }
 318
 319                 return mt76_mac_shared_key_setup(dev, mvif->idx, idx, key);
 320         }
 321
 322         return mt76_mac_wcid_set_key(dev, msta->wcid.idx, key);
 323 }
 324
 325 static int mt7601u_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
 326 {
 327         struct mt7601u_dev *dev = hw->priv;
 328
 329         mt76_rmw_field(dev, MT_TX_RTS_CFG, MT_TX_RTS_CFG_THRESH, value);
 330
 331         return 0;
 332 }
 333
 334 static int
 335 mt76_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 336                   enum ieee80211_ampdu_mlme_action action,
 337                   struct ieee80211_sta *sta, u16 tid, u16 *ssn, u8 buf_size)
 338 {
 339         struct mt7601u_dev *dev = hw->priv;
 340         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 341
 342         WARN_ON(msta->wcid.idx > GROUP_WCID(0));
 343
 344         switch (action) {
 345         case IEEE80211_AMPDU_RX_START:
 346                 mt76_set(dev, MT_WCID_ADDR(msta->wcid.idx) + 4, BIT(16 + tid));
 347                 break;
 348         case IEEE80211_AMPDU_RX_STOP:
 349                 mt76_clear(dev, MT_WCID_ADDR(msta->wcid.idx) + 4,
 350                            BIT(16 + tid));
 351                 break;
 352         case IEEE80211_AMPDU_TX_OPERATIONAL:
 353                 ieee80211_send_bar(vif, sta->addr, tid, msta->agg_ssn[tid]);
 354                 break;
 355         case IEEE80211_AMPDU_TX_STOP_FLUSH:
 356         case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
 357                 break;
 358         case IEEE80211_AMPDU_TX_START:
 359                 msta->agg_ssn[tid] = *ssn << 4;
 360                 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 361                 break;
 362         case IEEE80211_AMPDU_TX_STOP_CONT:
 363                 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 364                 break;
 365         }
 366
 367         return 0;
 368 }
 369
 370 static void
 371 mt76_sta_rate_tbl_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 372                          struct ieee80211_sta *sta)
 373 {
 374         struct mt7601u_dev *dev = hw->priv;
 375         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 376         struct ieee80211_sta_rates *rates;
 377         struct ieee80211_tx_rate rate = {};
 378
 379         rcu_read_lock();
 380         rates = rcu_dereference(sta->rates);
 381
 382         if (!rates)
 383                 goto out;
 384
 385         rate.idx = rates->rate[0].idx;
 386         rate.flags = rates->rate[0].flags;
 387         mt76_mac_wcid_set_rate(dev, &msta->wcid, &rate);
 388
 389 out:
 390         rcu_read_unlock();
 391 }
 392
 393 const struct ieee80211_ops mt7601u_ops = {
 394         .tx = mt7601u_tx,
 395         .start = mt7601u_start,
 396         .stop = mt7601u_stop,
 397         .add_interface = mt7601u_add_interface,
 398         .remove_interface = mt7601u_remove_interface,
 399         .config = mt7601u_config,
 400         .configure_filter = mt76_configure_filter,
 401         .bss_info_changed = mt7601u_bss_info_changed,
 402         .sta_add = mt7601u_sta_add,
 403         .sta_remove = mt7601u_sta_remove,
 404         .sta_notify = mt7601u_sta_notify,
 405         .set_key = mt7601u_set_key,
 406         .conf_tx = mt7601u_conf_tx,
 407         .sw_scan_start = mt7601u_sw_scan,
 408         .sw_scan_complete = mt7601u_sw_scan_complete,
 409         .ampdu_action = mt76_ampdu_action,
 410         .sta_rate_tbl_update = mt76_sta_rate_tbl_update,
 411         .set_rts_threshold = mt7601u_set_rts_threshold,
 412 };