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
  19 static int mt7601u_start(struct ieee80211_hw *hw)
  20 {
  21         struct mt7601u_dev *dev = hw->priv;
  22         int ret;
  23
  24         mutex_lock(&dev->mutex);
  25
  26         ret = mt7601u_mac_start(dev);
  27         if (ret)
  28                 goto out;
  29
  30         ieee80211_queue_delayed_work(dev->hw, &dev->mac_work,
  31                                      MT_CALIBRATE_INTERVAL);
  32         ieee80211_queue_delayed_work(dev->hw, &dev->cal_work,
  33                                      MT_CALIBRATE_INTERVAL);
  34 out:
  35         mutex_unlock(&dev->mutex);
  36         return ret;
  37 }
  38
  39 static void mt7601u_stop(struct ieee80211_hw *hw)
  40 {
  41         struct mt7601u_dev *dev = hw->priv;
  42
  43         mutex_lock(&dev->mutex);
  44
  45         cancel_delayed_work_sync(&dev->cal_work);
  46         cancel_delayed_work_sync(&dev->mac_work);
  47         mt7601u_mac_stop(dev);
  48
  49         mutex_unlock(&dev->mutex);
  50 }
  51
  52 static int mt7601u_add_interface(struct ieee80211_hw *hw,
  53                                  struct ieee80211_vif *vif)
  54 {
  55         struct mt7601u_dev *dev = hw->priv;
  56         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
  57         unsigned int idx = 0;
  58         unsigned int wcid = GROUP_WCID(idx);
  59
  60         /* Note: for AP do the AP-STA things mt76 does:
  61          *      - beacon offsets
  62          *      - do mac address tricks
  63          *      - shift vif idx
  64          */
  65         mvif->idx = idx;
  66
  67         if (!ether_addr_equal(dev->macaddr, vif->addr))
  68                 mt7601u_set_macaddr(dev, vif->addr);
  69
  70         if (dev->wcid_mask[wcid / BITS_PER_LONG] & BIT(wcid % BITS_PER_LONG))
  71                 return -ENOSPC;
  72         dev->wcid_mask[wcid / BITS_PER_LONG] |= BIT(wcid % BITS_PER_LONG);
  73         mvif->group_wcid.idx = wcid;
  74         mvif->group_wcid.hw_key_idx = -1;
  75
  76         return 0;
  77 }
  78
  79 static void mt7601u_remove_interface(struct ieee80211_hw *hw,
  80                                      struct ieee80211_vif *vif)
  81 {
  82         struct mt7601u_dev *dev = hw->priv;
  83         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
  84         unsigned int wcid = mvif->group_wcid.idx;
  85
  86         dev->wcid_mask[wcid / BITS_PER_LONG] &= ~BIT(wcid % BITS_PER_LONG);
  87 }
  88
  89 static int mt7601u_config(struct ieee80211_hw *hw, u32 changed)
  90 {
  91         struct mt7601u_dev *dev = hw->priv;
  92         int ret = 0;
  93
  94         mutex_lock(&dev->mutex);
  95
  96         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
  97                 ieee80211_stop_queues(hw);
  98                 ret = mt7601u_phy_set_channel(dev, &hw->conf.chandef);
  99                 ieee80211_wake_queues(hw);
 100         }
 101
 102         mutex_unlock(&dev->mutex);
 103
 104         return ret;
 105 }
 106
 107 static void
 108 mt76_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags,
 109                       unsigned int *total_flags, u64 multicast)
 110 {
 111         struct mt7601u_dev *dev = hw->priv;
 112         u32 flags = 0;
 113
 114 #define MT76_FILTER(_flag, _hw) do { \
 115                 flags |= *total_flags & FIF_##_flag;                    \
 116                 dev->rxfilter &= ~(_hw);                                \
 117                 dev->rxfilter |= !(flags & FIF_##_flag) * (_hw);        \
 118         } while (0)
 119
 120         mutex_lock(&dev->mutex);
 121
 122         dev->rxfilter &= ~MT_RX_FILTR_CFG_OTHER_BSS;
 123
 124         MT76_FILTER(OTHER_BSS, MT_RX_FILTR_CFG_PROMISC);
 125         MT76_FILTER(FCSFAIL, MT_RX_FILTR_CFG_CRC_ERR);
 126         MT76_FILTER(PLCPFAIL, MT_RX_FILTR_CFG_PHY_ERR);
 127         MT76_FILTER(CONTROL, MT_RX_FILTR_CFG_ACK |
 128                              MT_RX_FILTR_CFG_CTS |
 129                              MT_RX_FILTR_CFG_CFEND |
 130                              MT_RX_FILTR_CFG_CFACK |
 131                              MT_RX_FILTR_CFG_BA |
 132                              MT_RX_FILTR_CFG_CTRL_RSV);
 133         MT76_FILTER(PSPOLL, MT_RX_FILTR_CFG_PSPOLL);
 134
 135         *total_flags = flags;
 136         mt76_wr(dev, MT_RX_FILTR_CFG, dev->rxfilter);
 137
 138         mutex_unlock(&dev->mutex);
 139 }
 140
 141 static void
 142 mt7601u_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 143                          struct ieee80211_bss_conf *info, u32 changed)
 144 {
 145         struct mt7601u_dev *dev = hw->priv;
 146
 147         mutex_lock(&dev->mutex);
 148
 149         if (changed & BSS_CHANGED_ASSOC)
 150                 mt7601u_phy_con_cal_onoff(dev, info);
 151
 152         if (changed & BSS_CHANGED_BSSID) {
 153                 mt7601u_addr_wr(dev, MT_MAC_BSSID_DW0, info->bssid);
 154
 155                 /* Note: this is a hack because beacon_int is not changed
 156                  *       on leave nor is any more appropriate event generated.
 157                  *       rt2x00 doesn't seem to be bothered though.
 158                  */
 159                 if (is_zero_ether_addr(info->bssid))
 160                         mt7601u_mac_config_tsf(dev, false, 0);
 161         }
 162
 163         if (changed & BSS_CHANGED_BASIC_RATES) {
 164                 mt7601u_wr(dev, MT_LEGACY_BASIC_RATE, info->basic_rates);
 165                 mt7601u_wr(dev, MT_HT_FBK_CFG0, 0x65432100);
 166                 mt7601u_wr(dev, MT_HT_FBK_CFG1, 0xedcba980);
 167                 mt7601u_wr(dev, MT_LG_FBK_CFG0, 0xedcba988);
 168                 mt7601u_wr(dev, MT_LG_FBK_CFG1, 0x00002100);
 169         }
 170
 171         if (changed & BSS_CHANGED_BEACON_INT)
 172                 mt7601u_mac_config_tsf(dev, true, info->beacon_int);
 173
 174         if (changed & BSS_CHANGED_HT || changed & BSS_CHANGED_ERP_CTS_PROT)
 175                 mt7601u_mac_set_protection(dev, info->use_cts_prot,
 176                                            info->ht_operation_mode);
 177
 178         if (changed & BSS_CHANGED_ERP_PREAMBLE)
 179                 mt7601u_mac_set_short_preamble(dev, info->use_short_preamble);
 180
 181         if (changed & BSS_CHANGED_ERP_SLOT) {
 182                 int slottime = info->use_short_slot ? 9 : 20;
 183
 184                 mt76_rmw_field(dev, MT_BKOFF_SLOT_CFG,
 185                                MT_BKOFF_SLOT_CFG_SLOTTIME, slottime);
 186         }
 187
 188         if (changed & BSS_CHANGED_ASSOC)
 189                 mt7601u_phy_recalibrate_after_assoc(dev);
 190
 191         mutex_unlock(&dev->mutex);
 192 }
 193
 194 static int
 195 mt76_wcid_alloc(struct mt7601u_dev *dev)
 196 {
 197         int i, idx = 0;
 198
 199         for (i = 0; i < ARRAY_SIZE(dev->wcid_mask); i++) {
 200                 idx = ffs(~dev->wcid_mask[i]);
 201                 if (!idx)
 202                         continue;
 203
 204                 idx--;
 205                 dev->wcid_mask[i] |= BIT(idx);
 206                 break;
 207         }
 208
 209         idx = i * BITS_PER_LONG + idx;
 210         if (idx > 119)
 211                 return -1;
 212
 213         return idx;
 214 }
 215
 216 static int
 217 mt7601u_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 218                 struct ieee80211_sta *sta)
 219 {
 220         struct mt7601u_dev *dev = hw->priv;
 221         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 222         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
 223         int ret = 0;
 224         int idx = 0;
 225
 226         mutex_lock(&dev->mutex);
 227
 228         idx = mt76_wcid_alloc(dev);
 229         if (idx < 0) {
 230                 ret = -ENOSPC;
 231                 goto out;
 232         }
 233
 234         msta->wcid.idx = idx;
 235         msta->wcid.hw_key_idx = -1;
 236         mt7601u_mac_wcid_setup(dev, idx, mvif->idx, sta->addr);
 237         mt76_clear(dev, MT_WCID_DROP(idx), MT_WCID_DROP_MASK(idx));
 238         rcu_assign_pointer(dev->wcid[idx], &msta->wcid);
 239         mt7601u_mac_set_ampdu_factor(dev);
 240
 241 out:
 242         mutex_unlock(&dev->mutex);
 243
 244         return ret;
 245 }
 246
 247 static int
 248 mt7601u_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 249                    struct ieee80211_sta *sta)
 250 {
 251         struct mt7601u_dev *dev = hw->priv;
 252         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 253         int idx = msta->wcid.idx;
 254
 255         mutex_lock(&dev->mutex);
 256         rcu_assign_pointer(dev->wcid[idx], NULL);
 257         mt76_set(dev, MT_WCID_DROP(idx), MT_WCID_DROP_MASK(idx));
 258         dev->wcid_mask[idx / BITS_PER_LONG] &= ~BIT(idx % BITS_PER_LONG);
 259         mt7601u_mac_wcid_setup(dev, idx, 0, NULL);
 260         mt7601u_mac_set_ampdu_factor(dev);
 261         mutex_unlock(&dev->mutex);
 262
 263         return 0;
 264 }
 265
 266 static void
 267 mt7601u_sta_notify(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 268                    enum sta_notify_cmd cmd, struct ieee80211_sta *sta)
 269 {
 270 }
 271
 272 static void
 273 mt7601u_sw_scan(struct ieee80211_hw *hw,
 274                 struct ieee80211_vif *vif,
 275                 const u8 *mac_addr)
 276 {
 277         struct mt7601u_dev *dev = hw->priv;
 278
 279         mt7601u_agc_save(dev);
 280         set_bit(MT7601U_STATE_SCANNING, &dev->state);
 281 }
 282
 283 static void
 284 mt7601u_sw_scan_complete(struct ieee80211_hw *hw,
 285                          struct ieee80211_vif *vif)
 286 {
 287         struct mt7601u_dev *dev = hw->priv;
 288
 289         mt7601u_agc_restore(dev);
 290         clear_bit(MT7601U_STATE_SCANNING, &dev->state);
 291
 292         ieee80211_queue_delayed_work(dev->hw, &dev->cal_work,
 293                                      MT_CALIBRATE_INTERVAL);
 294         if (dev->freq_cal.enabled)
 295                 ieee80211_queue_delayed_work(dev->hw, &dev->freq_cal.work,
 296                                              MT_FREQ_CAL_INIT_DELAY);
 297 }
 298
 299 static int
 300 mt7601u_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 301                 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 302                 struct ieee80211_key_conf *key)
 303 {
 304         struct mt7601u_dev *dev = hw->priv;
 305         struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
 306         struct mt76_sta *msta = sta ? (struct mt76_sta *) sta->drv_priv : NULL;
 307         struct mt76_wcid *wcid = msta ? &msta->wcid : &mvif->group_wcid;
 308         int idx = key->keyidx;
 309         int ret;
 310
 311         /* fall back to sw encryption for unsupported ciphers */
 312         switch (key->cipher) {
 313         case WLAN_CIPHER_SUITE_WEP40:
 314         case WLAN_CIPHER_SUITE_WEP104:
 315         case WLAN_CIPHER_SUITE_TKIP:
 316         case WLAN_CIPHER_SUITE_CCMP:
 317                 break;
 318         default:
 319                 return -EOPNOTSUPP;
 320         }
 321
 322         if (cmd == SET_KEY) {
 323                 key->hw_key_idx = wcid->idx;
 324                 wcid->hw_key_idx = idx;
 325         } else {
 326                 if (idx == wcid->hw_key_idx)
 327                         wcid->hw_key_idx = -1;
 328
 329                 key = NULL;
 330         }
 331
 332         if (!msta) {
 333                 if (key || wcid->hw_key_idx == idx) {
 334                         ret = mt76_mac_wcid_set_key(dev, wcid->idx, key);
 335                         if (ret)
 336                                 return ret;
 337                 }
 338
 339                 return mt76_mac_shared_key_setup(dev, mvif->idx, idx, key);
 340         }
 341
 342         return mt76_mac_wcid_set_key(dev, msta->wcid.idx, key);
 343 }
 344
 345 static int mt7601u_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
 346 {
 347         struct mt7601u_dev *dev = hw->priv;
 348
 349         mt76_rmw_field(dev, MT_TX_RTS_CFG, MT_TX_RTS_CFG_THRESH, value);
 350
 351         return 0;
 352 }
 353
 354 static int
 355 mt76_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 356                   struct ieee80211_ampdu_params *params)
 357 {
 358         struct mt7601u_dev *dev = hw->priv;
 359         struct ieee80211_sta *sta = params->sta;
 360         enum ieee80211_ampdu_mlme_action action = params->action;
 361         u16 tid = params->tid;
 362         u16 *ssn = &params->ssn;
 363         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 364
 365         WARN_ON(msta->wcid.idx > GROUP_WCID(0));
 366
 367         switch (action) {
 368         case IEEE80211_AMPDU_RX_START:
 369                 mt76_set(dev, MT_WCID_ADDR(msta->wcid.idx) + 4, BIT(16 + tid));
 370                 break;
 371         case IEEE80211_AMPDU_RX_STOP:
 372                 mt76_clear(dev, MT_WCID_ADDR(msta->wcid.idx) + 4,
 373                            BIT(16 + tid));
 374                 break;
 375         case IEEE80211_AMPDU_TX_OPERATIONAL:
 376                 ieee80211_send_bar(vif, sta->addr, tid, msta->agg_ssn[tid]);
 377                 break;
 378         case IEEE80211_AMPDU_TX_STOP_FLUSH:
 379         case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
 380                 break;
 381         case IEEE80211_AMPDU_TX_START:
 382                 msta->agg_ssn[tid] = *ssn << 4;
 383                 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 384                 break;
 385         case IEEE80211_AMPDU_TX_STOP_CONT:
 386                 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 387                 break;
 388         }
 389
 390         return 0;
 391 }
 392
 393 static void
 394 mt76_sta_rate_tbl_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 395                          struct ieee80211_sta *sta)
 396 {
 397         struct mt7601u_dev *dev = hw->priv;
 398         struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
 399         struct ieee80211_sta_rates *rates;
 400         struct ieee80211_tx_rate rate = {};
 401
 402         rcu_read_lock();
 403         rates = rcu_dereference(sta->rates);
 404
 405         if (!rates)
 406                 goto out;
 407
 408         rate.idx = rates->rate[0].idx;
 409         rate.flags = rates->rate[0].flags;
 410         mt76_mac_wcid_set_rate(dev, &msta->wcid, &rate);
 411
 412 out:
 413         rcu_read_unlock();
 414 }
 415
 416 const struct ieee80211_ops mt7601u_ops = {
 417         .tx = mt7601u_tx,
 418         .start = mt7601u_start,
 419         .stop = mt7601u_stop,
 420         .add_interface = mt7601u_add_interface,
 421         .remove_interface = mt7601u_remove_interface,
 422         .config = mt7601u_config,
 423         .configure_filter = mt76_configure_filter,
 424         .bss_info_changed = mt7601u_bss_info_changed,
 425         .sta_add = mt7601u_sta_add,
 426         .sta_remove = mt7601u_sta_remove,
 427         .sta_notify = mt7601u_sta_notify,
 428         .set_key = mt7601u_set_key,
 429         .conf_tx = mt7601u_conf_tx,
 430         .sw_scan_start = mt7601u_sw_scan,
 431         .sw_scan_complete = mt7601u_sw_scan_complete,
 432         .ampdu_action = mt76_ampdu_action,
 433         .sta_rate_tbl_update = mt76_sta_rate_tbl_update,
 434         .set_rts_threshold = mt7601u_set_rts_threshold,
 435 };