drivers/net/wireless/intersil/p54/main.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * mac80211 glue code for mac80211 Prism54 drivers
   4  *
   5  * Copyright (c) 2006, Michael Wu <[email protected]>
   6  * Copyright (c) 2007-2009, Christian Lamparter <[email protected]>
   7  * Copyright 2008, Johannes Berg <[email protected]>
   8  *
   9  * Based on:
  10  * - the islsm (softmac prism54) driver, which is:
  11  *   Copyright 2004-2006 Jean-Baptiste Note <[email protected]>, et al.
  12  * - stlc45xx driver
  13  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
  14  */
  15
  16 #include <linux/slab.h>
  17 #include <linux/firmware.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/module.h>
  20
  21 #include <net/mac80211.h>
  22
  23 #include "p54.h"
  24 #include "lmac.h"
  25
  26 static bool modparam_nohwcrypt;
  27 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, 0444);
  28 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  29 MODULE_AUTHOR("Michael Wu <[email protected]>");
  30 MODULE_DESCRIPTION("Softmac Prism54 common code");
  31 MODULE_LICENSE("GPL");
  32 MODULE_ALIAS("prism54common");
  33
  34 static int p54_sta_add_remove(struct ieee80211_hw *hw,
  35                               struct ieee80211_vif *vif,
  36                               struct ieee80211_sta *sta)
  37 {
  38         struct p54_common *priv = hw->priv;
  39
  40         /*
  41          * Notify the firmware that we don't want or we don't
  42          * need to buffer frames for this station anymore.
  43          */
  44
  45         p54_sta_unlock(priv, sta->addr);
  46
  47         return 0;
  48 }
  49
  50 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
  51                               enum sta_notify_cmd notify_cmd,
  52                               struct ieee80211_sta *sta)
  53 {
  54         struct p54_common *priv = dev->priv;
  55
  56         switch (notify_cmd) {
  57         case STA_NOTIFY_AWAKE:
  58                 /* update the firmware's filter table */
  59                 p54_sta_unlock(priv, sta->addr);
  60                 break;
  61         default:
  62                 break;
  63         }
  64 }
  65
  66 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
  67                         bool set)
  68 {
  69         struct p54_common *priv = dev->priv;
  70
  71         return p54_update_beacon_tim(priv, sta->aid, set);
  72 }
  73
  74 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
  75 {
  76         struct ieee80211_mgmt *mgmt = (void *)skb->data;
  77         u8 *pos, *end;
  78
  79         if (skb->len <= sizeof(mgmt))
  80                 return NULL;
  81
  82         pos = (u8 *)mgmt->u.beacon.variable;
  83         end = skb->data + skb->len;
  84         while (pos < end) {
  85                 if (pos + 2 + pos[1] > end)
  86                         return NULL;
  87
  88                 if (pos[0] == ie)
  89                         return pos;
  90
  91                 pos += 2 + pos[1];
  92         }
  93         return NULL;
  94 }
  95
  96 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
  97 {
  98         /*
  99          * the good excuse for this mess is ... the firmware.
 100          * The dummy TIM MUST be at the end of the beacon frame,
 101          * because it'll be overwritten!
 102          */
 103         u8 *tim;
 104         u8 dtim_len;
 105         u8 dtim_period;
 106         u8 *next;
 107
 108         tim = p54_find_ie(skb, WLAN_EID_TIM);
 109         if (!tim)
 110                 return 0;
 111
 112         dtim_len = tim[1];
 113         dtim_period = tim[3];
 114         next = tim + 2 + dtim_len;
 115
 116         if (dtim_len < 3)
 117                 return -EINVAL;
 118
 119         memmove(tim, next, skb_tail_pointer(skb) - next);
 120         tim = skb_tail_pointer(skb) - (dtim_len + 2);
 121
 122         /* add the dummy at the end */
 123         tim[0] = WLAN_EID_TIM;
 124         tim[1] = 3;
 125         tim[2] = 0;
 126         tim[3] = dtim_period;
 127         tim[4] = 0;
 128
 129         if (dtim_len > 3)
 130                 skb_trim(skb, skb->len - (dtim_len - 3));
 131
 132         return 0;
 133 }
 134
 135 static int p54_beacon_update(struct p54_common *priv,
 136                         struct ieee80211_vif *vif)
 137 {
 138         struct ieee80211_tx_control control = { };
 139         struct sk_buff *beacon;
 140         int ret;
 141
 142         beacon = ieee80211_beacon_get(priv->hw, vif, 0);
 143         if (!beacon)
 144                 return -ENOMEM;
 145         ret = p54_beacon_format_ie_tim(beacon);
 146         if (ret)
 147                 return ret;
 148
 149         /*
 150          * During operation, the firmware takes care of beaconing.
 151          * The driver only needs to upload a new beacon template, once
 152          * the template was changed by the stack or userspace.
 153          *
 154          * LMAC API 3.2.2 also specifies that the driver does not need
 155          * to cancel the old beacon template by hand, instead the firmware
 156          * will release the previous one through the feedback mechanism.
 157          */
 158         p54_tx_80211(priv->hw, &control, beacon);
 159         priv->tsf_high32 = 0;
 160         priv->tsf_low32 = 0;
 161
 162         return 0;
 163 }
 164
 165 static int p54_start(struct ieee80211_hw *dev)
 166 {
 167         struct p54_common *priv = dev->priv;
 168         int err;
 169
 170         mutex_lock(&priv->conf_mutex);
 171         err = priv->open(dev);
 172         if (err)
 173                 goto out;
 174         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
 175         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
 176         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
 177         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
 178         err = p54_set_edcf(priv);
 179         if (err)
 180                 goto out;
 181
 182         eth_broadcast_addr(priv->bssid);
 183         priv->mode = NL80211_IFTYPE_MONITOR;
 184         err = p54_setup_mac(priv);
 185         if (err) {
 186                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 187                 goto out;
 188         }
 189
 190         ieee80211_queue_delayed_work(dev, &priv->work, 0);
 191
 192         priv->softled_state = 0;
 193         err = p54_set_leds(priv);
 194
 195 out:
 196         mutex_unlock(&priv->conf_mutex);
 197         return err;
 198 }
 199
 200 static void p54_stop(struct ieee80211_hw *dev, bool suspend)
 201 {
 202         struct p54_common *priv = dev->priv;
 203         int i;
 204
 205         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 206         priv->softled_state = 0;
 207         cancel_delayed_work_sync(&priv->work);
 208         mutex_lock(&priv->conf_mutex);
 209         p54_set_leds(priv);
 210         priv->stop(dev);
 211         skb_queue_purge(&priv->tx_pending);
 212         skb_queue_purge(&priv->tx_queue);
 213         for (i = 0; i < P54_QUEUE_NUM; i++) {
 214                 priv->tx_stats[i].count = 0;
 215                 priv->tx_stats[i].len = 0;
 216         }
 217
 218         priv->beacon_req_id = cpu_to_le32(0);
 219         priv->tsf_high32 = priv->tsf_low32 = 0;
 220         mutex_unlock(&priv->conf_mutex);
 221 }
 222
 223 static int p54_add_interface(struct ieee80211_hw *dev,
 224                              struct ieee80211_vif *vif)
 225 {
 226         struct p54_common *priv = dev->priv;
 227         int err;
 228
 229         vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
 230
 231         mutex_lock(&priv->conf_mutex);
 232         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 233                 mutex_unlock(&priv->conf_mutex);
 234                 return -EOPNOTSUPP;
 235         }
 236
 237         priv->vif = vif;
 238
 239         switch (vif->type) {
 240         case NL80211_IFTYPE_STATION:
 241         case NL80211_IFTYPE_ADHOC:
 242         case NL80211_IFTYPE_AP:
 243         case NL80211_IFTYPE_MESH_POINT:
 244                 priv->mode = vif->type;
 245                 break;
 246         default:
 247                 mutex_unlock(&priv->conf_mutex);
 248                 return -EOPNOTSUPP;
 249         }
 250
 251         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 252         err = p54_setup_mac(priv);
 253         mutex_unlock(&priv->conf_mutex);
 254         return err;
 255 }
 256
 257 static void p54_remove_interface(struct ieee80211_hw *dev,
 258                                  struct ieee80211_vif *vif)
 259 {
 260         struct p54_common *priv = dev->priv;
 261
 262         mutex_lock(&priv->conf_mutex);
 263         priv->vif = NULL;
 264
 265         /*
 266          * LMAC API 3.2.2 states that any active beacon template must be
 267          * canceled by the driver before attempting a mode transition.
 268          */
 269         if (le32_to_cpu(priv->beacon_req_id) != 0) {
 270                 p54_tx_cancel(priv, priv->beacon_req_id);
 271                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
 272         }
 273         priv->mode = NL80211_IFTYPE_MONITOR;
 274         eth_zero_addr(priv->mac_addr);
 275         eth_zero_addr(priv->bssid);
 276         p54_setup_mac(priv);
 277         mutex_unlock(&priv->conf_mutex);
 278 }
 279
 280 static int p54_wait_for_stats(struct ieee80211_hw *dev)
 281 {
 282         struct p54_common *priv = dev->priv;
 283         int ret;
 284
 285         priv->update_stats = true;
 286         ret = p54_fetch_statistics(priv);
 287         if (ret)
 288                 return ret;
 289
 290         ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
 291         if (ret == 0)
 292                 return -ETIMEDOUT;
 293
 294         return 0;
 295 }
 296
 297 static void p54_reset_stats(struct p54_common *priv)
 298 {
 299         struct ieee80211_channel *chan = priv->curchan;
 300
 301         if (chan) {
 302                 struct survey_info *info = &priv->survey[chan->hw_value];
 303
 304                 /* only reset channel statistics, don't touch .filled, etc. */
 305                 info->time = 0;
 306                 info->time_busy = 0;
 307                 info->time_tx = 0;
 308         }
 309
 310         priv->update_stats = true;
 311         priv->survey_raw.active = 0;
 312         priv->survey_raw.cca = 0;
 313         priv->survey_raw.tx = 0;
 314 }
 315
 316 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 317 {
 318         int ret = 0;
 319         struct p54_common *priv = dev->priv;
 320         struct ieee80211_conf *conf = &dev->conf;
 321
 322         mutex_lock(&priv->conf_mutex);
 323         if (changed & IEEE80211_CONF_CHANGE_POWER)
 324                 priv->output_power = conf->power_level << 2;
 325         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 326                 struct ieee80211_channel *oldchan;
 327                 WARN_ON(p54_wait_for_stats(dev));
 328                 oldchan = priv->curchan;
 329                 priv->curchan = NULL;
 330                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 331                 if (ret) {
 332                         priv->curchan = oldchan;
 333                         goto out;
 334                 }
 335                 /*
 336                  * TODO: Use the LM_SCAN_TRAP to determine the current
 337                  * operating channel.
 338                  */
 339                 priv->curchan = priv->hw->conf.chandef.chan;
 340                 p54_reset_stats(priv);
 341                 WARN_ON(p54_fetch_statistics(priv));
 342         }
 343         if (changed & IEEE80211_CONF_CHANGE_PS) {
 344                 WARN_ON(p54_wait_for_stats(dev));
 345                 ret = p54_set_ps(priv);
 346                 if (ret)
 347                         goto out;
 348                 WARN_ON(p54_wait_for_stats(dev));
 349         }
 350         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
 351                 WARN_ON(p54_wait_for_stats(dev));
 352                 ret = p54_setup_mac(priv);
 353                 if (ret)
 354                         goto out;
 355                 WARN_ON(p54_wait_for_stats(dev));
 356         }
 357
 358 out:
 359         mutex_unlock(&priv->conf_mutex);
 360         return ret;
 361 }
 362
 363 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
 364                                  struct netdev_hw_addr_list *mc_list)
 365 {
 366         struct p54_common *priv = dev->priv;
 367         struct netdev_hw_addr *ha;
 368         int i;
 369
 370         BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
 371                 ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
 372         /*
 373          * The first entry is reserved for the global broadcast MAC.
 374          * Otherwise the firmware will drop it and ARP will no longer work.
 375          */
 376         i = 1;
 377         priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
 378         netdev_hw_addr_list_for_each(ha, mc_list) {
 379                 memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
 380                 i++;
 381                 if (i >= ARRAY_SIZE(priv->mc_maclist))
 382                         break;
 383         }
 384
 385         return 1; /* update */
 386 }
 387
 388 static void p54_configure_filter(struct ieee80211_hw *dev,
 389                                  unsigned int changed_flags,
 390                                  unsigned int *total_flags,
 391                                  u64 multicast)
 392 {
 393         struct p54_common *priv = dev->priv;
 394
 395         *total_flags &= FIF_ALLMULTI | FIF_OTHER_BSS;
 396
 397         priv->filter_flags = *total_flags;
 398
 399         if (changed_flags & FIF_OTHER_BSS)
 400                 p54_setup_mac(priv);
 401
 402         if (changed_flags & FIF_ALLMULTI || multicast)
 403                 p54_set_groupfilter(priv);
 404 }
 405
 406 static int p54_conf_tx(struct ieee80211_hw *dev,
 407                        struct ieee80211_vif *vif,
 408                        unsigned int link_id, u16 queue,
 409                        const struct ieee80211_tx_queue_params *params)
 410 {
 411         struct p54_common *priv = dev->priv;
 412         int ret;
 413
 414         mutex_lock(&priv->conf_mutex);
 415         P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 416                       params->cw_min, params->cw_max, params->txop);
 417         ret = p54_set_edcf(priv);
 418         mutex_unlock(&priv->conf_mutex);
 419         return ret;
 420 }
 421
 422 static void p54_work(struct work_struct *work)
 423 {
 424         struct p54_common *priv = container_of(work, struct p54_common,
 425                                                work.work);
 426
 427         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 428                 return ;
 429
 430         /*
 431          * TODO: walk through tx_queue and do the following tasks
 432          *      1. initiate bursts.
 433          *      2. cancel stuck frames / reset the device if necessary.
 434          */
 435
 436         mutex_lock(&priv->conf_mutex);
 437         WARN_ON_ONCE(p54_fetch_statistics(priv));
 438         mutex_unlock(&priv->conf_mutex);
 439 }
 440
 441 static int p54_get_stats(struct ieee80211_hw *dev,
 442                          struct ieee80211_low_level_stats *stats)
 443 {
 444         struct p54_common *priv = dev->priv;
 445
 446         memcpy(stats, &priv->stats, sizeof(*stats));
 447         return 0;
 448 }
 449
 450 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 451                                  struct ieee80211_vif *vif,
 452                                  struct ieee80211_bss_conf *info,
 453                                  u64 changed)
 454 {
 455         struct p54_common *priv = dev->priv;
 456
 457         mutex_lock(&priv->conf_mutex);
 458         if (changed & BSS_CHANGED_BSSID) {
 459                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 460                 p54_setup_mac(priv);
 461         }
 462
 463         if (changed & BSS_CHANGED_BEACON) {
 464                 p54_scan(priv, P54_SCAN_EXIT, 0);
 465                 p54_setup_mac(priv);
 466                 p54_beacon_update(priv, vif);
 467                 p54_set_edcf(priv);
 468         }
 469
 470         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 471                 priv->use_short_slot = info->use_short_slot;
 472                 p54_set_edcf(priv);
 473         }
 474         if (changed & BSS_CHANGED_BASIC_RATES) {
 475                 if (dev->conf.chandef.chan->band == NL80211_BAND_5GHZ)
 476                         priv->basic_rate_mask = (info->basic_rates << 4);
 477                 else
 478                         priv->basic_rate_mask = info->basic_rates;
 479                 p54_setup_mac(priv);
 480                 if (priv->fw_var >= 0x500)
 481                         p54_scan(priv, P54_SCAN_EXIT, 0);
 482         }
 483         if (changed & BSS_CHANGED_ASSOC) {
 484                 if (vif->cfg.assoc) {
 485                         priv->aid = vif->cfg.aid;
 486                         priv->wakeup_timer = info->beacon_int *
 487                                              info->dtim_period * 5;
 488                         p54_setup_mac(priv);
 489                 } else {
 490                         priv->wakeup_timer = 500;
 491                         priv->aid = 0;
 492                 }
 493         }
 494
 495         mutex_unlock(&priv->conf_mutex);
 496 }
 497
 498 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 499                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 500                        struct ieee80211_key_conf *key)
 501 {
 502         struct p54_common *priv = dev->priv;
 503         int slot, ret = 0;
 504         u8 algo = 0;
 505         u8 *addr = NULL;
 506
 507         if (modparam_nohwcrypt)
 508                 return -EOPNOTSUPP;
 509
 510         if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
 511                 /*
 512                  * Unfortunately most/all firmwares are trying to decrypt
 513                  * incoming management frames if a suitable key can be found.
 514                  * However, in doing so the data in these frames gets
 515                  * corrupted. So, we can't have firmware supported crypto
 516                  * offload in this case.
 517                  */
 518                 return -EOPNOTSUPP;
 519         }
 520
 521         mutex_lock(&priv->conf_mutex);
 522         if (cmd == SET_KEY) {
 523                 switch (key->cipher) {
 524                 case WLAN_CIPHER_SUITE_TKIP:
 525                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 526                               BR_DESC_PRIV_CAP_TKIP))) {
 527                                 ret = -EOPNOTSUPP;
 528                                 goto out_unlock;
 529                         }
 530                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 531                         algo = P54_CRYPTO_TKIPMICHAEL;
 532                         break;
 533                 case WLAN_CIPHER_SUITE_WEP40:
 534                 case WLAN_CIPHER_SUITE_WEP104:
 535                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 536                                 ret = -EOPNOTSUPP;
 537                                 goto out_unlock;
 538                         }
 539                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 540                         algo = P54_CRYPTO_WEP;
 541                         break;
 542                 case WLAN_CIPHER_SUITE_CCMP:
 543                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 544                                 ret = -EOPNOTSUPP;
 545                                 goto out_unlock;
 546                         }
 547                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 548                         algo = P54_CRYPTO_AESCCMP;
 549                         break;
 550                 default:
 551                         ret = -EOPNOTSUPP;
 552                         goto out_unlock;
 553                 }
 554                 slot = bitmap_find_free_region(priv->used_rxkeys,
 555                                                priv->rx_keycache_size, 0);
 556
 557                 if (slot < 0) {
 558                         /*
 559                          * The device supports the chosen algorithm, but the
 560                          * firmware does not provide enough key slots to store
 561                          * all of them.
 562                          * But encryption offload for outgoing frames is always
 563                          * possible, so we just pretend that the upload was
 564                          * successful and do the decryption in software.
 565                          */
 566
 567                         /* mark the key as invalid. */
 568                         key->hw_key_idx = 0xff;
 569                         goto out_unlock;
 570                 }
 571
 572                 key->flags |= IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
 573         } else {
 574                 slot = key->hw_key_idx;
 575
 576                 if (slot == 0xff) {
 577                         /* This key was not uploaded into the rx key cache. */
 578
 579                         goto out_unlock;
 580                 }
 581
 582                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 583                 algo = 0;
 584         }
 585
 586         if (sta)
 587                 addr = sta->addr;
 588
 589         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 590                              key->keylen, addr, key->key);
 591         if (ret) {
 592                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 593                 ret = -EOPNOTSUPP;
 594                 goto out_unlock;
 595         }
 596
 597         key->hw_key_idx = slot;
 598
 599 out_unlock:
 600         mutex_unlock(&priv->conf_mutex);
 601         return ret;
 602 }
 603
 604 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
 605                                 struct survey_info *survey)
 606 {
 607         struct p54_common *priv = dev->priv;
 608         struct ieee80211_channel *chan;
 609         int err, tries;
 610         bool in_use = false;
 611
 612         if (idx >= priv->chan_num)
 613                 return -ENOENT;
 614
 615 #define MAX_TRIES 1
 616         for (tries = 0; tries < MAX_TRIES; tries++) {
 617                 chan = priv->curchan;
 618                 if (chan && chan->hw_value == idx) {
 619                         mutex_lock(&priv->conf_mutex);
 620                         err = p54_wait_for_stats(dev);
 621                         mutex_unlock(&priv->conf_mutex);
 622                         if (err)
 623                                 return err;
 624
 625                         in_use = true;
 626                 }
 627
 628                 memcpy(survey, &priv->survey[idx], sizeof(*survey));
 629
 630                 if (in_use) {
 631                         /* test if the reported statistics are valid. */
 632                         if  (survey->time != 0) {
 633                                 survey->filled |= SURVEY_INFO_IN_USE;
 634                         } else {
 635                                 /*
 636                                  * hw/fw has not accumulated enough sample sets.
 637                                  * Wait for 100ms, this ought to be enough to
 638                                  * get at least one non-null set of channel
 639                                  * usage statistics.
 640                                  */
 641                                 msleep(100);
 642                                 continue;
 643                         }
 644                 }
 645                 return 0;
 646         }
 647         return -ETIMEDOUT;
 648 #undef MAX_TRIES
 649 }
 650
 651 static unsigned int p54_flush_count(struct p54_common *priv)
 652 {
 653         unsigned int total = 0, i;
 654
 655         BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
 656
 657         /*
 658          * Because the firmware has the sole control over any frames
 659          * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
 660          * don't really count as pending or active.
 661          */
 662         for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
 663                 total += priv->tx_stats[i].len;
 664         return total;
 665 }
 666
 667 static void p54_flush(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
 668                       u32 queues, bool drop)
 669 {
 670         struct p54_common *priv = dev->priv;
 671         unsigned int total, i;
 672
 673         /*
 674          * Currently, it wouldn't really matter if we wait for one second
 675          * or 15 minutes. But once someone gets around and completes the
 676          * TODOs [ancel stuck frames / reset device] in p54_work, it will
 677          * suddenly make sense to wait that long.
 678          */
 679         i = P54_STATISTICS_UPDATE * 2 / 20;
 680
 681         /*
 682          * In this case no locking is required because as we speak the
 683          * queues have already been stopped and no new frames can sneak
 684          * up from behind.
 685          */
 686         while ((total = p54_flush_count(priv)) && i--) {
 687                 /* waste time */
 688                 msleep(20);
 689         }
 690
 691         WARN(total, "tx flush timeout, unresponsive firmware");
 692 }
 693
 694 static void p54_set_coverage_class(struct ieee80211_hw *dev,
 695                                    s16 coverage_class)
 696 {
 697         struct p54_common *priv = dev->priv;
 698
 699         mutex_lock(&priv->conf_mutex);
 700         /* support all coverage class values as in 802.11-2007 Table 7-27 */
 701         priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
 702         p54_set_edcf(priv);
 703         mutex_unlock(&priv->conf_mutex);
 704 }
 705
 706 static const struct ieee80211_ops p54_ops = {
 707         .add_chanctx = ieee80211_emulate_add_chanctx,
 708         .remove_chanctx = ieee80211_emulate_remove_chanctx,
 709         .change_chanctx = ieee80211_emulate_change_chanctx,
 710         .switch_vif_chanctx = ieee80211_emulate_switch_vif_chanctx,
 711         .tx                     = p54_tx_80211,
 712         .wake_tx_queue          = ieee80211_handle_wake_tx_queue,
 713         .start                  = p54_start,
 714         .stop                   = p54_stop,
 715         .add_interface          = p54_add_interface,
 716         .remove_interface       = p54_remove_interface,
 717         .set_tim                = p54_set_tim,
 718         .sta_notify             = p54_sta_notify,
 719         .sta_add                = p54_sta_add_remove,
 720         .sta_remove             = p54_sta_add_remove,
 721         .set_key                = p54_set_key,
 722         .config                 = p54_config,
 723         .flush                  = p54_flush,
 724         .bss_info_changed       = p54_bss_info_changed,
 725         .prepare_multicast      = p54_prepare_multicast,
 726         .configure_filter       = p54_configure_filter,
 727         .conf_tx                = p54_conf_tx,
 728         .get_stats              = p54_get_stats,
 729         .get_survey             = p54_get_survey,
 730         .set_coverage_class     = p54_set_coverage_class,
 731 };
 732
 733 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 734 {
 735         struct ieee80211_hw *dev;
 736         struct p54_common *priv;
 737
 738         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 739         if (!dev)
 740                 return NULL;
 741
 742         priv = dev->priv;
 743         priv->hw = dev;
 744         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 745         priv->basic_rate_mask = 0x15f;
 746         spin_lock_init(&priv->tx_stats_lock);
 747         skb_queue_head_init(&priv->tx_queue);
 748         skb_queue_head_init(&priv->tx_pending);
 749         ieee80211_hw_set(dev, REPORTS_TX_ACK_STATUS);
 750         ieee80211_hw_set(dev, MFP_CAPABLE);
 751         ieee80211_hw_set(dev, PS_NULLFUNC_STACK);
 752         ieee80211_hw_set(dev, SUPPORTS_PS);
 753         ieee80211_hw_set(dev, RX_INCLUDES_FCS);
 754         ieee80211_hw_set(dev, SIGNAL_DBM);
 755
 756         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 757                                       BIT(NL80211_IFTYPE_ADHOC) |
 758                                       BIT(NL80211_IFTYPE_AP) |
 759                                       BIT(NL80211_IFTYPE_MESH_POINT);
 760
 761         priv->beacon_req_id = cpu_to_le32(0);
 762         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 763         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 764         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 765         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 766         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 767         dev->queues = 1;
 768         priv->noise = -94;
 769         /*
 770          * We support at most 8 tries no matter which rate they're at,
 771          * we cannot support max_rates * max_rate_tries as we set it
 772          * here, but setting it correctly to 4/2 or so would limit us
 773          * artificially if the RC algorithm wants just two rates, so
 774          * let's say 4/7, we'll redistribute it at TX time, see the
 775          * comments there.
 776          */
 777         dev->max_rates = 4;
 778         dev->max_rate_tries = 7;
 779         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 780                                  sizeof(struct p54_tx_data);
 781
 782         /*
 783          * For now, disable PS by default because it affects
 784          * link stability significantly.
 785          */
 786         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 787
 788         mutex_init(&priv->conf_mutex);
 789         mutex_init(&priv->eeprom_mutex);
 790         init_completion(&priv->stat_comp);
 791         init_completion(&priv->eeprom_comp);
 792         init_completion(&priv->beacon_comp);
 793         INIT_DELAYED_WORK(&priv->work, p54_work);
 794
 795         eth_broadcast_addr(priv->mc_maclist[0]);
 796         priv->curchan = NULL;
 797         p54_reset_stats(priv);
 798         return dev;
 799 }
 800 EXPORT_SYMBOL_GPL(p54_init_common);
 801
 802 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 803 {
 804         struct p54_common __maybe_unused *priv = dev->priv;
 805         int err;
 806
 807         err = ieee80211_register_hw(dev);
 808         if (err) {
 809                 dev_err(pdev, "Cannot register device (%d).\n", err);
 810                 return err;
 811         }
 812         priv->registered = true;
 813
 814 #ifdef CONFIG_P54_LEDS
 815         err = p54_init_leds(priv);
 816         if (err) {
 817                 p54_unregister_common(dev);
 818                 return err;
 819         }
 820 #endif /* CONFIG_P54_LEDS */
 821
 822         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 823         return 0;
 824 }
 825 EXPORT_SYMBOL_GPL(p54_register_common);
 826
 827 void p54_free_common(struct ieee80211_hw *dev)
 828 {
 829         struct p54_common *priv = dev->priv;
 830         unsigned int i;
 831
 832         for (i = 0; i < NUM_NL80211_BANDS; i++)
 833                 kfree(priv->band_table[i]);
 834
 835         kfree(priv->iq_autocal);
 836         kfree(priv->output_limit);
 837         kfree(priv->curve_data);
 838         kfree(priv->rssi_db);
 839         bitmap_free(priv->used_rxkeys);
 840         kfree(priv->survey);
 841         priv->iq_autocal = NULL;
 842         priv->output_limit = NULL;
 843         priv->curve_data = NULL;
 844         priv->rssi_db = NULL;
 845         priv->used_rxkeys = NULL;
 846         priv->survey = NULL;
 847         ieee80211_free_hw(dev);
 848 }
 849 EXPORT_SYMBOL_GPL(p54_free_common);
 850
 851 void p54_unregister_common(struct ieee80211_hw *dev)
 852 {
 853         struct p54_common *priv = dev->priv;
 854
 855         if (priv->registered) {
 856                 priv->registered = false;
 857 #ifdef CONFIG_P54_LEDS
 858                 p54_unregister_leds(priv);
 859 #endif /* CONFIG_P54_LEDS */
 860                 ieee80211_unregister_hw(dev);
 861         }
 862
 863         mutex_destroy(&priv->conf_mutex);
 864         mutex_destroy(&priv->eeprom_mutex);
 865 }
 866 EXPORT_SYMBOL_GPL(p54_unregister_common);