drivers/net/wireless/ralink/rt2x00/rt2x00dev.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   4         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   5         <http://rt2x00.serialmonkey.com>
   6
   7  */
   8
   9 /*
  10         Module: rt2x00lib
  11         Abstract: rt2x00 generic device routines.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/log2.h>
  18 #include <linux/of.h>
  19 #include <linux/of_net.h>
  20
  21 #include "rt2x00.h"
  22 #include "rt2x00lib.h"
  23
  24 /*
  25  * Utility functions.
  26  */
  27 u32 rt2x00lib_get_bssidx(struct rt2x00_dev *rt2x00dev,
  28                          struct ieee80211_vif *vif)
  29 {
  30         /*
  31          * When in STA mode, bssidx is always 0 otherwise local_address[5]
  32          * contains the bss number, see BSS_ID_MASK comments for details.
  33          */
  34         if (rt2x00dev->intf_sta_count)
  35                 return 0;
  36         return vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1);
  37 }
  38 EXPORT_SYMBOL_GPL(rt2x00lib_get_bssidx);
  39
  40 /*
  41  * Radio control handlers.
  42  */
  43 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  44 {
  45         int status;
  46
  47         /*
  48          * Don't enable the radio twice.
  49          * And check if the hardware button has been disabled.
  50          */
  51         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  52                 return 0;
  53
  54         /*
  55          * Initialize all data queues.
  56          */
  57         rt2x00queue_init_queues(rt2x00dev);
  58
  59         /*
  60          * Enable radio.
  61          */
  62         status =
  63             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  64         if (status)
  65                 return status;
  66
  67         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  68
  69         rt2x00leds_led_radio(rt2x00dev, true);
  70         rt2x00led_led_activity(rt2x00dev, true);
  71
  72         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  73
  74         /*
  75          * Enable queues.
  76          */
  77         rt2x00queue_start_queues(rt2x00dev);
  78         rt2x00link_start_tuner(rt2x00dev);
  79
  80         /*
  81          * Start watchdog monitoring.
  82          */
  83         rt2x00link_start_watchdog(rt2x00dev);
  84
  85         return 0;
  86 }
  87
  88 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  89 {
  90         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  91                 return;
  92
  93         /*
  94          * Stop watchdog monitoring.
  95          */
  96         rt2x00link_stop_watchdog(rt2x00dev);
  97
  98         /*
  99          * Stop all queues
 100          */
 101         rt2x00link_stop_tuner(rt2x00dev);
 102         rt2x00queue_stop_queues(rt2x00dev);
 103         rt2x00queue_flush_queues(rt2x00dev, true);
 104
 105         /*
 106          * Disable radio.
 107          */
 108         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 109         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 110         rt2x00led_led_activity(rt2x00dev, false);
 111         rt2x00leds_led_radio(rt2x00dev, false);
 112 }
 113
 114 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 115                                           struct ieee80211_vif *vif)
 116 {
 117         struct rt2x00_dev *rt2x00dev = data;
 118         struct rt2x00_intf *intf = vif_to_intf(vif);
 119
 120         /*
 121          * It is possible the radio was disabled while the work had been
 122          * scheduled. If that happens we should return here immediately,
 123          * note that in the spinlock protected area above the delayed_flags
 124          * have been cleared correctly.
 125          */
 126         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 127                 return;
 128
 129         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags)) {
 130                 mutex_lock(&intf->beacon_skb_mutex);
 131                 rt2x00queue_update_beacon(rt2x00dev, vif);
 132                 mutex_unlock(&intf->beacon_skb_mutex);
 133         }
 134 }
 135
 136 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 137 {
 138         struct rt2x00_dev *rt2x00dev =
 139             container_of(work, struct rt2x00_dev, intf_work);
 140
 141         /*
 142          * Iterate over each interface and perform the
 143          * requested configurations.
 144          */
 145         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 146                                             IEEE80211_IFACE_ITER_RESUME_ALL,
 147                                             rt2x00lib_intf_scheduled_iter,
 148                                             rt2x00dev);
 149 }
 150
 151 static void rt2x00lib_autowakeup(struct work_struct *work)
 152 {
 153         struct rt2x00_dev *rt2x00dev =
 154             container_of(work, struct rt2x00_dev, autowakeup_work.work);
 155
 156         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 157                 return;
 158
 159         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
 160                 rt2x00_err(rt2x00dev, "Device failed to wakeup\n");
 161         clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 162 }
 163
 164 /*
 165  * Interrupt context handlers.
 166  */
 167 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 168                                      struct ieee80211_vif *vif)
 169 {
 170         struct ieee80211_tx_control control = {};
 171         struct rt2x00_dev *rt2x00dev = data;
 172         struct sk_buff *skb;
 173
 174         /*
 175          * Only AP mode interfaces do broad- and multicast buffering
 176          */
 177         if (vif->type != NL80211_IFTYPE_AP)
 178                 return;
 179
 180         /*
 181          * Send out buffered broad- and multicast frames
 182          */
 183         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 184         while (skb) {
 185                 rt2x00mac_tx(rt2x00dev->hw, &control, skb);
 186                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 187         }
 188 }
 189
 190 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 191                                         struct ieee80211_vif *vif)
 192 {
 193         struct rt2x00_dev *rt2x00dev = data;
 194
 195         if (vif->type != NL80211_IFTYPE_AP &&
 196             vif->type != NL80211_IFTYPE_ADHOC &&
 197             vif->type != NL80211_IFTYPE_MESH_POINT &&
 198             vif->type != NL80211_IFTYPE_WDS)
 199                 return;
 200
 201         /*
 202          * Update the beacon without locking. This is safe on PCI devices
 203          * as they only update the beacon periodically here. This should
 204          * never be called for USB devices.
 205          */
 206         WARN_ON(rt2x00_is_usb(rt2x00dev));
 207         rt2x00queue_update_beacon(rt2x00dev, vif);
 208 }
 209
 210 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 211 {
 212         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 213                 return;
 214
 215         /* send buffered bc/mc frames out for every bssid */
 216         ieee80211_iterate_active_interfaces_atomic(
 217                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 218                 rt2x00lib_bc_buffer_iter, rt2x00dev);
 219         /*
 220          * Devices with pre tbtt interrupt don't need to update the beacon
 221          * here as they will fetch the next beacon directly prior to
 222          * transmission.
 223          */
 224         if (rt2x00_has_cap_pre_tbtt_interrupt(rt2x00dev))
 225                 return;
 226
 227         /* fetch next beacon */
 228         ieee80211_iterate_active_interfaces_atomic(
 229                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 230                 rt2x00lib_beaconupdate_iter, rt2x00dev);
 231 }
 232 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 233
 234 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 235 {
 236         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 237                 return;
 238
 239         /* fetch next beacon */
 240         ieee80211_iterate_active_interfaces_atomic(
 241                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 242                 rt2x00lib_beaconupdate_iter, rt2x00dev);
 243 }
 244 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 245
 246 void rt2x00lib_dmastart(struct queue_entry *entry)
 247 {
 248         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 249         rt2x00queue_index_inc(entry, Q_INDEX);
 250 }
 251 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 252
 253 void rt2x00lib_dmadone(struct queue_entry *entry)
 254 {
 255         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 256         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 257         rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
 258 }
 259 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 260
 261 static inline int rt2x00lib_txdone_bar_status(struct queue_entry *entry)
 262 {
 263         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 264         struct ieee80211_bar *bar = (void *) entry->skb->data;
 265         struct rt2x00_bar_list_entry *bar_entry;
 266         int ret;
 267
 268         if (likely(!ieee80211_is_back_req(bar->frame_control)))
 269                 return 0;
 270
 271         /*
 272          * Unlike all other frames, the status report for BARs does
 273          * not directly come from the hardware as it is incapable of
 274          * matching a BA to a previously send BAR. The hardware will
 275          * report all BARs as if they weren't acked at all.
 276          *
 277          * Instead the RX-path will scan for incoming BAs and set the
 278          * block_acked flag if it sees one that was likely caused by
 279          * a BAR from us.
 280          *
 281          * Remove remaining BARs here and return their status for
 282          * TX done processing.
 283          */
 284         ret = 0;
 285         rcu_read_lock();
 286         list_for_each_entry_rcu(bar_entry, &rt2x00dev->bar_list, list) {
 287                 if (bar_entry->entry != entry)
 288                         continue;
 289
 290                 spin_lock_bh(&rt2x00dev->bar_list_lock);
 291                 /* Return whether this BAR was blockacked or not */
 292                 ret = bar_entry->block_acked;
 293                 /* Remove the BAR from our checklist */
 294                 list_del_rcu(&bar_entry->list);
 295                 spin_unlock_bh(&rt2x00dev->bar_list_lock);
 296                 kfree_rcu(bar_entry, head);
 297
 298                 break;
 299         }
 300         rcu_read_unlock();
 301
 302         return ret;
 303 }
 304
 305 static void rt2x00lib_fill_tx_status(struct rt2x00_dev *rt2x00dev,
 306                                      struct ieee80211_tx_info *tx_info,
 307                                      struct skb_frame_desc *skbdesc,
 308                                      struct txdone_entry_desc *txdesc,
 309                                      bool success)
 310 {
 311         u8 rate_idx, rate_flags, retry_rates;
 312         int i;
 313
 314         rate_idx = skbdesc->tx_rate_idx;
 315         rate_flags = skbdesc->tx_rate_flags;
 316         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 317             (txdesc->retry + 1) : 1;
 318
 319         /*
 320          * Initialize TX status
 321          */
 322         memset(&tx_info->status, 0, sizeof(tx_info->status));
 323         tx_info->status.ack_signal = 0;
 324
 325         /*
 326          * Frame was send with retries, hardware tried
 327          * different rates to send out the frame, at each
 328          * retry it lowered the rate 1 step except when the
 329          * lowest rate was used.
 330          */
 331         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 332                 tx_info->status.rates[i].idx = rate_idx - i;
 333                 tx_info->status.rates[i].flags = rate_flags;
 334
 335                 if (rate_idx - i == 0) {
 336                         /*
 337                          * The lowest rate (index 0) was used until the
 338                          * number of max retries was reached.
 339                          */
 340                         tx_info->status.rates[i].count = retry_rates - i;
 341                         i++;
 342                         break;
 343                 }
 344                 tx_info->status.rates[i].count = 1;
 345         }
 346         if (i < (IEEE80211_TX_MAX_RATES - 1))
 347                 tx_info->status.rates[i].idx = -1; /* terminate */
 348
 349         if (test_bit(TXDONE_NO_ACK_REQ, &txdesc->flags))
 350                 tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
 351
 352         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 353                 if (success)
 354                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 355                 else
 356                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 357         }
 358
 359         /*
 360          * Every single frame has it's own tx status, hence report
 361          * every frame as ampdu of size 1.
 362          *
 363          * TODO: if we can find out how many frames were aggregated
 364          * by the hw we could provide the real ampdu_len to mac80211
 365          * which would allow the rc algorithm to better decide on
 366          * which rates are suitable.
 367          */
 368         if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
 369             tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 370                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU |
 371                                   IEEE80211_TX_CTL_AMPDU;
 372                 tx_info->status.ampdu_len = 1;
 373                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 374
 375                 if (!success)
 376                         tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 377         }
 378
 379         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 380                 if (success)
 381                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 382                 else
 383                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 384         }
 385 }
 386
 387 static void rt2x00lib_clear_entry(struct rt2x00_dev *rt2x00dev,
 388                                   struct queue_entry *entry)
 389 {
 390         /*
 391          * Make this entry available for reuse.
 392          */
 393         entry->skb = NULL;
 394         entry->flags = 0;
 395
 396         rt2x00dev->ops->lib->clear_entry(entry);
 397
 398         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 399
 400         /*
 401          * If the data queue was below the threshold before the txdone
 402          * handler we must make sure the packet queue in the mac80211 stack
 403          * is reenabled when the txdone handler has finished. This has to be
 404          * serialized with rt2x00mac_tx(), otherwise we can wake up queue
 405          * before it was stopped.
 406          */
 407         spin_lock_bh(&entry->queue->tx_lock);
 408         if (!rt2x00queue_threshold(entry->queue))
 409                 rt2x00queue_unpause_queue(entry->queue);
 410         spin_unlock_bh(&entry->queue->tx_lock);
 411 }
 412
 413 void rt2x00lib_txdone_nomatch(struct queue_entry *entry,
 414                               struct txdone_entry_desc *txdesc)
 415 {
 416         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 417         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 418         struct ieee80211_tx_info txinfo = {};
 419         bool success;
 420
 421         /*
 422          * Unmap the skb.
 423          */
 424         rt2x00queue_unmap_skb(entry);
 425
 426         /*
 427          * Signal that the TX descriptor is no longer in the skb.
 428          */
 429         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 430
 431         /*
 432          * Send frame to debugfs immediately, after this call is completed
 433          * we are going to overwrite the skb->cb array.
 434          */
 435         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry);
 436
 437         /*
 438          * Determine if the frame has been successfully transmitted and
 439          * remove BARs from our check list while checking for their
 440          * TX status.
 441          */
 442         success =
 443             rt2x00lib_txdone_bar_status(entry) ||
 444             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 445
 446         if (!test_bit(TXDONE_UNKNOWN, &txdesc->flags)) {
 447                 /*
 448                  * Update TX statistics.
 449                  */
 450                 rt2x00dev->link.qual.tx_success += success;
 451                 rt2x00dev->link.qual.tx_failed += !success;
 452
 453                 rt2x00lib_fill_tx_status(rt2x00dev, &txinfo, skbdesc, txdesc,
 454                                          success);
 455                 ieee80211_tx_status_noskb(rt2x00dev->hw, skbdesc->sta, &txinfo);
 456         }
 457
 458         dev_kfree_skb_any(entry->skb);
 459         rt2x00lib_clear_entry(rt2x00dev, entry);
 460 }
 461 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_nomatch);
 462
 463 void rt2x00lib_txdone(struct queue_entry *entry,
 464                       struct txdone_entry_desc *txdesc)
 465 {
 466         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 467         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 468         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 469         u8 skbdesc_flags = skbdesc->flags;
 470         unsigned int header_length;
 471         bool success;
 472
 473         /*
 474          * Unmap the skb.
 475          */
 476         rt2x00queue_unmap_skb(entry);
 477
 478         /*
 479          * Remove the extra tx headroom from the skb.
 480          */
 481         skb_pull(entry->skb, rt2x00dev->extra_tx_headroom);
 482
 483         /*
 484          * Signal that the TX descriptor is no longer in the skb.
 485          */
 486         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 487
 488         /*
 489          * Determine the length of 802.11 header.
 490          */
 491         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 492
 493         /*
 494          * Remove L2 padding which was added during
 495          */
 496         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
 497                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 498
 499         /*
 500          * If the IV/EIV data was stripped from the frame before it was
 501          * passed to the hardware, we should now reinsert it again because
 502          * mac80211 will expect the same data to be present it the
 503          * frame as it was passed to us.
 504          */
 505         if (rt2x00_has_cap_hw_crypto(rt2x00dev))
 506                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 507
 508         /*
 509          * Send frame to debugfs immediately, after this call is completed
 510          * we are going to overwrite the skb->cb array.
 511          */
 512         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry);
 513
 514         /*
 515          * Determine if the frame has been successfully transmitted and
 516          * remove BARs from our check list while checking for their
 517          * TX status.
 518          */
 519         success =
 520             rt2x00lib_txdone_bar_status(entry) ||
 521             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 522             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 523
 524         /*
 525          * Update TX statistics.
 526          */
 527         rt2x00dev->link.qual.tx_success += success;
 528         rt2x00dev->link.qual.tx_failed += !success;
 529
 530         rt2x00lib_fill_tx_status(rt2x00dev, tx_info, skbdesc, txdesc, success);
 531
 532         /*
 533          * Only send the status report to mac80211 when it's a frame
 534          * that originated in mac80211. If this was a extra frame coming
 535          * through a mac80211 library call (RTS/CTS) then we should not
 536          * send the status report back.
 537          */
 538         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 539                 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TASKLET_CONTEXT))
 540                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 541                 else
 542                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 543         } else {
 544                 dev_kfree_skb_any(entry->skb);
 545         }
 546
 547         rt2x00lib_clear_entry(rt2x00dev, entry);
 548 }
 549 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 550
 551 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 552 {
 553         struct txdone_entry_desc txdesc;
 554
 555         txdesc.flags = 0;
 556         __set_bit(status, &txdesc.flags);
 557         txdesc.retry = 0;
 558
 559         rt2x00lib_txdone(entry, &txdesc);
 560 }
 561 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 562
 563 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 564 {
 565         struct ieee80211_mgmt *mgmt = (void *)data;
 566         u8 *pos, *end;
 567
 568         pos = (u8 *)mgmt->u.beacon.variable;
 569         end = data + len;
 570         while (pos < end) {
 571                 if (pos + 2 + pos[1] > end)
 572                         return NULL;
 573
 574                 if (pos[0] == ie)
 575                         return pos;
 576
 577                 pos += 2 + pos[1];
 578         }
 579
 580         return NULL;
 581 }
 582
 583 static void rt2x00lib_sleep(struct work_struct *work)
 584 {
 585         struct rt2x00_dev *rt2x00dev =
 586             container_of(work, struct rt2x00_dev, sleep_work);
 587
 588         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 589                 return;
 590
 591         /*
 592          * Check again is powersaving is enabled, to prevent races from delayed
 593          * work execution.
 594          */
 595         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 596                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 597                                  IEEE80211_CONF_CHANGE_PS);
 598 }
 599
 600 static void rt2x00lib_rxdone_check_ba(struct rt2x00_dev *rt2x00dev,
 601                                       struct sk_buff *skb,
 602                                       struct rxdone_entry_desc *rxdesc)
 603 {
 604         struct rt2x00_bar_list_entry *entry;
 605         struct ieee80211_bar *ba = (void *)skb->data;
 606
 607         if (likely(!ieee80211_is_back(ba->frame_control)))
 608                 return;
 609
 610         if (rxdesc->size < sizeof(*ba) + FCS_LEN)
 611                 return;
 612
 613         rcu_read_lock();
 614         list_for_each_entry_rcu(entry, &rt2x00dev->bar_list, list) {
 615
 616                 if (ba->start_seq_num != entry->start_seq_num)
 617                         continue;
 618
 619 #define TID_CHECK(a, b) (                                               \
 620         ((a) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)) ==        \
 621         ((b) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)))          \
 622
 623                 if (!TID_CHECK(ba->control, entry->control))
 624                         continue;
 625
 626 #undef TID_CHECK
 627
 628                 if (!ether_addr_equal_64bits(ba->ra, entry->ta))
 629                         continue;
 630
 631                 if (!ether_addr_equal_64bits(ba->ta, entry->ra))
 632                         continue;
 633
 634                 /* Mark BAR since we received the according BA */
 635                 spin_lock_bh(&rt2x00dev->bar_list_lock);
 636                 entry->block_acked = 1;
 637                 spin_unlock_bh(&rt2x00dev->bar_list_lock);
 638                 break;
 639         }
 640         rcu_read_unlock();
 641
 642 }
 643
 644 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 645                                       struct sk_buff *skb,
 646                                       struct rxdone_entry_desc *rxdesc)
 647 {
 648         struct ieee80211_hdr *hdr = (void *) skb->data;
 649         struct ieee80211_tim_ie *tim_ie;
 650         u8 *tim;
 651         u8 tim_len;
 652         bool cam;
 653
 654         /* If this is not a beacon, or if mac80211 has no powersaving
 655          * configured, or if the device is already in powersaving mode
 656          * we can exit now. */
 657         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 658                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 659                 return;
 660
 661         /* min. beacon length + FCS_LEN */
 662         if (skb->len <= 40 + FCS_LEN)
 663                 return;
 664
 665         /* and only beacons from the associated BSSID, please */
 666         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 667             !rt2x00dev->aid)
 668                 return;
 669
 670         rt2x00dev->last_beacon = jiffies;
 671
 672         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 673         if (!tim)
 674                 return;
 675
 676         if (tim[1] < sizeof(*tim_ie))
 677                 return;
 678
 679         tim_len = tim[1];
 680         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 681
 682         /* Check whenever the PHY can be turned off again. */
 683
 684         /* 1. What about buffered unicast traffic for our AID? */
 685         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 686
 687         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 688         cam |= (tim_ie->bitmap_ctrl & 0x01);
 689
 690         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 691                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 692 }
 693
 694 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 695                                         struct rxdone_entry_desc *rxdesc)
 696 {
 697         struct ieee80211_supported_band *sband;
 698         const struct rt2x00_rate *rate;
 699         unsigned int i;
 700         int signal = rxdesc->signal;
 701         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 702
 703         switch (rxdesc->rate_mode) {
 704         case RATE_MODE_CCK:
 705         case RATE_MODE_OFDM:
 706                 /*
 707                  * For non-HT rates the MCS value needs to contain the
 708                  * actually used rate modulation (CCK or OFDM).
 709                  */
 710                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 711                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 712
 713                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 714                 for (i = 0; i < sband->n_bitrates; i++) {
 715                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 716                         if (((type == RXDONE_SIGNAL_PLCP) &&
 717                              (rate->plcp == signal)) ||
 718                             ((type == RXDONE_SIGNAL_BITRATE) &&
 719                               (rate->bitrate == signal)) ||
 720                             ((type == RXDONE_SIGNAL_MCS) &&
 721                               (rate->mcs == signal))) {
 722                                 return i;
 723                         }
 724                 }
 725                 break;
 726         case RATE_MODE_HT_MIX:
 727         case RATE_MODE_HT_GREENFIELD:
 728                 if (signal >= 0 && signal <= 76)
 729                         return signal;
 730                 break;
 731         default:
 732                 break;
 733         }
 734
 735         rt2x00_warn(rt2x00dev, "Frame received with unrecognized signal, mode=0x%.4x, signal=0x%.4x, type=%d\n",
 736                     rxdesc->rate_mode, signal, type);
 737         return 0;
 738 }
 739
 740 void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
 741 {
 742         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 743         struct rxdone_entry_desc rxdesc;
 744         struct sk_buff *skb;
 745         struct ieee80211_rx_status *rx_status;
 746         unsigned int header_length;
 747         int rate_idx;
 748
 749         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 750             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 751                 goto submit_entry;
 752
 753         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 754                 goto submit_entry;
 755
 756         /*
 757          * Allocate a new sk_buffer. If no new buffer available, drop the
 758          * received frame and reuse the existing buffer.
 759          */
 760         skb = rt2x00queue_alloc_rxskb(entry, gfp);
 761         if (!skb)
 762                 goto submit_entry;
 763
 764         /*
 765          * Unmap the skb.
 766          */
 767         rt2x00queue_unmap_skb(entry);
 768
 769         /*
 770          * Extract the RXD details.
 771          */
 772         memset(&rxdesc, 0, sizeof(rxdesc));
 773         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 774
 775         /*
 776          * Check for valid size in case we get corrupted descriptor from
 777          * hardware.
 778          */
 779         if (unlikely(rxdesc.size == 0 ||
 780                      rxdesc.size > entry->queue->data_size)) {
 781                 rt2x00_err(rt2x00dev, "Wrong frame size %d max %d\n",
 782                            rxdesc.size, entry->queue->data_size);
 783                 dev_kfree_skb(entry->skb);
 784                 goto renew_skb;
 785         }
 786
 787         /*
 788          * The data behind the ieee80211 header must be
 789          * aligned on a 4 byte boundary.
 790          */
 791         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 792
 793         /*
 794          * Hardware might have stripped the IV/EIV/ICV data,
 795          * in that case it is possible that the data was
 796          * provided separately (through hardware descriptor)
 797          * in which case we should reinsert the data into the frame.
 798          */
 799         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 800             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 801                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 802                                           &rxdesc);
 803         else if (header_length &&
 804                  (rxdesc.size > header_length) &&
 805                  (rxdesc.dev_flags & RXDONE_L2PAD))
 806                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 807
 808         /* Trim buffer to correct size */
 809         skb_trim(entry->skb, rxdesc.size);
 810
 811         /*
 812          * Translate the signal to the correct bitrate index.
 813          */
 814         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 815         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 816             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 817                 rxdesc.encoding = RX_ENC_HT;
 818
 819         /*
 820          * Check if this is a beacon, and more frames have been
 821          * buffered while we were in powersaving mode.
 822          */
 823         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 824
 825         /*
 826          * Check for incoming BlockAcks to match to the BlockAckReqs
 827          * we've send out.
 828          */
 829         rt2x00lib_rxdone_check_ba(rt2x00dev, entry->skb, &rxdesc);
 830
 831         /*
 832          * Update extra components
 833          */
 834         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 835         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 836         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry);
 837
 838         /*
 839          * Initialize RX status information, and send frame
 840          * to mac80211.
 841          */
 842         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 843
 844         /* Ensure that all fields of rx_status are initialized
 845          * properly. The skb->cb array was used for driver
 846          * specific informations, so rx_status might contain
 847          * garbage.
 848          */
 849         memset(rx_status, 0, sizeof(*rx_status));
 850
 851         rx_status->mactime = rxdesc.timestamp;
 852         rx_status->band = rt2x00dev->curr_band;
 853         rx_status->freq = rt2x00dev->curr_freq;
 854         rx_status->rate_idx = rate_idx;
 855         rx_status->signal = rxdesc.rssi;
 856         rx_status->flag = rxdesc.flags;
 857         rx_status->enc_flags = rxdesc.enc_flags;
 858         rx_status->encoding = rxdesc.encoding;
 859         rx_status->bw = rxdesc.bw;
 860         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 861
 862         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 863
 864 renew_skb:
 865         /*
 866          * Replace the skb with the freshly allocated one.
 867          */
 868         entry->skb = skb;
 869
 870 submit_entry:
 871         entry->flags = 0;
 872         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 873         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 874             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 875                 rt2x00dev->ops->lib->clear_entry(entry);
 876 }
 877 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 878
 879 /*
 880  * Driver initialization handlers.
 881  */
 882 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 883         {
 884                 .flags = DEV_RATE_CCK,
 885                 .bitrate = 10,
 886                 .ratemask = BIT(0),
 887                 .plcp = 0x00,
 888                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 889         },
 890         {
 891                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 892                 .bitrate = 20,
 893                 .ratemask = BIT(1),
 894                 .plcp = 0x01,
 895                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 896         },
 897         {
 898                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 899                 .bitrate = 55,
 900                 .ratemask = BIT(2),
 901                 .plcp = 0x02,
 902                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 903         },
 904         {
 905                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 906                 .bitrate = 110,
 907                 .ratemask = BIT(3),
 908                 .plcp = 0x03,
 909                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 910         },
 911         {
 912                 .flags = DEV_RATE_OFDM,
 913                 .bitrate = 60,
 914                 .ratemask = BIT(4),
 915                 .plcp = 0x0b,
 916                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 917         },
 918         {
 919                 .flags = DEV_RATE_OFDM,
 920                 .bitrate = 90,
 921                 .ratemask = BIT(5),
 922                 .plcp = 0x0f,
 923                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 924         },
 925         {
 926                 .flags = DEV_RATE_OFDM,
 927                 .bitrate = 120,
 928                 .ratemask = BIT(6),
 929                 .plcp = 0x0a,
 930                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 931         },
 932         {
 933                 .flags = DEV_RATE_OFDM,
 934                 .bitrate = 180,
 935                 .ratemask = BIT(7),
 936                 .plcp = 0x0e,
 937                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 938         },
 939         {
 940                 .flags = DEV_RATE_OFDM,
 941                 .bitrate = 240,
 942                 .ratemask = BIT(8),
 943                 .plcp = 0x09,
 944                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 945         },
 946         {
 947                 .flags = DEV_RATE_OFDM,
 948                 .bitrate = 360,
 949                 .ratemask = BIT(9),
 950                 .plcp = 0x0d,
 951                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 952         },
 953         {
 954                 .flags = DEV_RATE_OFDM,
 955                 .bitrate = 480,
 956                 .ratemask = BIT(10),
 957                 .plcp = 0x08,
 958                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 959         },
 960         {
 961                 .flags = DEV_RATE_OFDM,
 962                 .bitrate = 540,
 963                 .ratemask = BIT(11),
 964                 .plcp = 0x0c,
 965                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 966         },
 967 };
 968
 969 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 970                               const int channel, const int tx_power,
 971                               const int value)
 972 {
 973         /* XXX: this assumption about the band is wrong for 802.11j */
 974         entry->band = channel <= 14 ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 975         entry->center_freq = ieee80211_channel_to_frequency(channel,
 976                                                             entry->band);
 977         entry->hw_value = value;
 978         entry->max_power = tx_power;
 979         entry->max_antenna_gain = 0xff;
 980 }
 981
 982 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 983                            const u16 index, const struct rt2x00_rate *rate)
 984 {
 985         entry->flags = 0;
 986         entry->bitrate = rate->bitrate;
 987         entry->hw_value = index;
 988         entry->hw_value_short = index;
 989
 990         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 991                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 992 }
 993
 994 void rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr)
 995 {
 996         const char *mac_addr;
 997
 998         mac_addr = of_get_mac_address(rt2x00dev->dev->of_node);
 999         if (!IS_ERR(mac_addr))
1000                 ether_addr_copy(eeprom_mac_addr, mac_addr);
1001
1002         if (!is_valid_ether_addr(eeprom_mac_addr)) {
1003                 eth_random_addr(eeprom_mac_addr);
1004                 rt2x00_eeprom_dbg(rt2x00dev, "MAC: %pM\n", eeprom_mac_addr);
1005         }
1006 }
1007 EXPORT_SYMBOL_GPL(rt2x00lib_set_mac_address);
1008
1009 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
1010                                     struct hw_mode_spec *spec)
1011 {
1012         struct ieee80211_hw *hw = rt2x00dev->hw;
1013         struct ieee80211_channel *channels;
1014         struct ieee80211_rate *rates;
1015         unsigned int num_rates;
1016         unsigned int i;
1017
1018         num_rates = 0;
1019         if (spec->supported_rates & SUPPORT_RATE_CCK)
1020                 num_rates += 4;
1021         if (spec->supported_rates & SUPPORT_RATE_OFDM)
1022                 num_rates += 8;
1023
1024         channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
1025         if (!channels)
1026                 return -ENOMEM;
1027
1028         rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
1029         if (!rates)
1030                 goto exit_free_channels;
1031
1032         /*
1033          * Initialize Rate list.
1034          */
1035         for (i = 0; i < num_rates; i++)
1036                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
1037
1038         /*
1039          * Initialize Channel list.
1040          */
1041         for (i = 0; i < spec->num_channels; i++) {
1042                 rt2x00lib_channel(&channels[i],
1043                                   spec->channels[i].channel,
1044                                   spec->channels_info[i].max_power, i);
1045         }
1046
1047         /*
1048          * Intitialize 802.11b, 802.11g
1049          * Rates: CCK, OFDM.
1050          * Channels: 2.4 GHz
1051          */
1052         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
1053                 rt2x00dev->bands[NL80211_BAND_2GHZ].n_channels = 14;
1054                 rt2x00dev->bands[NL80211_BAND_2GHZ].n_bitrates = num_rates;
1055                 rt2x00dev->bands[NL80211_BAND_2GHZ].channels = channels;
1056                 rt2x00dev->bands[NL80211_BAND_2GHZ].bitrates = rates;
1057                 hw->wiphy->bands[NL80211_BAND_2GHZ] =
1058                     &rt2x00dev->bands[NL80211_BAND_2GHZ];
1059                 memcpy(&rt2x00dev->bands[NL80211_BAND_2GHZ].ht_cap,
1060                        &spec->ht, sizeof(spec->ht));
1061         }
1062
1063         /*
1064          * Intitialize 802.11a
1065          * Rates: OFDM.
1066          * Channels: OFDM, UNII, HiperLAN2.
1067          */
1068         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
1069                 rt2x00dev->bands[NL80211_BAND_5GHZ].n_channels =
1070                     spec->num_channels - 14;
1071                 rt2x00dev->bands[NL80211_BAND_5GHZ].n_bitrates =
1072                     num_rates - 4;
1073                 rt2x00dev->bands[NL80211_BAND_5GHZ].channels = &channels[14];
1074                 rt2x00dev->bands[NL80211_BAND_5GHZ].bitrates = &rates[4];
1075                 hw->wiphy->bands[NL80211_BAND_5GHZ] =
1076                     &rt2x00dev->bands[NL80211_BAND_5GHZ];
1077                 memcpy(&rt2x00dev->bands[NL80211_BAND_5GHZ].ht_cap,
1078                        &spec->ht, sizeof(spec->ht));
1079         }
1080
1081         return 0;
1082
1083  exit_free_channels:
1084         kfree(channels);
1085         rt2x00_err(rt2x00dev, "Allocation ieee80211 modes failed\n");
1086         return -ENOMEM;
1087 }
1088
1089 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
1090 {
1091         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1092                 ieee80211_unregister_hw(rt2x00dev->hw);
1093
1094         if (likely(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ])) {
1095                 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels);
1096                 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->bitrates);
1097                 rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ] = NULL;
1098                 rt2x00dev->hw->wiphy->bands[NL80211_BAND_5GHZ] = NULL;
1099         }
1100
1101         kfree(rt2x00dev->spec.channels_info);
1102 }
1103
1104 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
1105 {
1106         struct hw_mode_spec *spec = &rt2x00dev->spec;
1107         int status;
1108
1109         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1110                 return 0;
1111
1112         /*
1113          * Initialize HW modes.
1114          */
1115         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
1116         if (status)
1117                 return status;
1118
1119         /*
1120          * Initialize HW fields.
1121          */
1122         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
1123
1124         /*
1125          * Initialize extra TX headroom required.
1126          */
1127         rt2x00dev->hw->extra_tx_headroom =
1128                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
1129                       rt2x00dev->extra_tx_headroom);
1130
1131         /*
1132          * Take TX headroom required for alignment into account.
1133          */
1134         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
1135                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
1136         else if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DMA))
1137                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
1138
1139         /*
1140          * Tell mac80211 about the size of our private STA structure.
1141          */
1142         rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
1143
1144         /*
1145          * Allocate tx status FIFO for driver use.
1146          */
1147         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO)) {
1148                 /*
1149                  * Allocate the txstatus fifo. In the worst case the tx
1150                  * status fifo has to hold the tx status of all entries
1151                  * in all tx queues. Hence, calculate the kfifo size as
1152                  * tx_queues * entry_num and round up to the nearest
1153                  * power of 2.
1154                  */
1155                 int kfifo_size =
1156                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
1157                                            rt2x00dev->tx->limit *
1158                                            sizeof(u32));
1159
1160                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
1161                                      GFP_KERNEL);
1162                 if (status)
1163                         return status;
1164         }
1165
1166         /*
1167          * Initialize tasklets if used by the driver. Tasklets are
1168          * disabled until the interrupts are turned on. The driver
1169          * has to handle that.
1170          */
1171 #define RT2X00_TASKLET_INIT(taskletname) \
1172         if (rt2x00dev->ops->lib->taskletname) { \
1173                 tasklet_init(&rt2x00dev->taskletname, \
1174                              rt2x00dev->ops->lib->taskletname, \
1175                              (unsigned long)rt2x00dev); \
1176         }
1177
1178         RT2X00_TASKLET_INIT(txstatus_tasklet);
1179         RT2X00_TASKLET_INIT(pretbtt_tasklet);
1180         RT2X00_TASKLET_INIT(tbtt_tasklet);
1181         RT2X00_TASKLET_INIT(rxdone_tasklet);
1182         RT2X00_TASKLET_INIT(autowake_tasklet);
1183
1184 #undef RT2X00_TASKLET_INIT
1185
1186         /*
1187          * Register HW.
1188          */
1189         status = ieee80211_register_hw(rt2x00dev->hw);
1190         if (status)
1191                 return status;
1192
1193         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1194
1195         return 0;
1196 }
1197
1198 /*
1199  * Initialization/uninitialization handlers.
1200  */
1201 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1202 {
1203         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1204                 return;
1205
1206         /*
1207          * Stop rfkill polling.
1208          */
1209         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1210                 rt2x00rfkill_unregister(rt2x00dev);
1211
1212         /*
1213          * Allow the HW to uninitialize.
1214          */
1215         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1216
1217         /*
1218          * Free allocated queue entries.
1219          */
1220         rt2x00queue_uninitialize(rt2x00dev);
1221 }
1222
1223 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1224 {
1225         int status;
1226
1227         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1228                 return 0;
1229
1230         /*
1231          * Allocate all queue entries.
1232          */
1233         status = rt2x00queue_initialize(rt2x00dev);
1234         if (status)
1235                 return status;
1236
1237         /*
1238          * Initialize the device.
1239          */
1240         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1241         if (status) {
1242                 rt2x00queue_uninitialize(rt2x00dev);
1243                 return status;
1244         }
1245
1246         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1247
1248         /*
1249          * Start rfkill polling.
1250          */
1251         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1252                 rt2x00rfkill_register(rt2x00dev);
1253
1254         return 0;
1255 }
1256
1257 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1258 {
1259         int retval;
1260
1261         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) {
1262                 /*
1263                  * This is special case for ieee80211_restart_hw(), otherwise
1264                  * mac80211 never call start() two times in row without stop();
1265                  */
1266                 rt2x00dev->ops->lib->pre_reset_hw(rt2x00dev);
1267                 rt2x00lib_stop(rt2x00dev);
1268         }
1269
1270         /*
1271          * If this is the first interface which is added,
1272          * we should load the firmware now.
1273          */
1274         retval = rt2x00lib_load_firmware(rt2x00dev);
1275         if (retval)
1276                 return retval;
1277
1278         /*
1279          * Initialize the device.
1280          */
1281         retval = rt2x00lib_initialize(rt2x00dev);
1282         if (retval)
1283                 return retval;
1284
1285         rt2x00dev->intf_ap_count = 0;
1286         rt2x00dev->intf_sta_count = 0;
1287         rt2x00dev->intf_associated = 0;
1288
1289         /* Enable the radio */
1290         retval = rt2x00lib_enable_radio(rt2x00dev);
1291         if (retval)
1292                 return retval;
1293
1294         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1295
1296         return 0;
1297 }
1298
1299 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1300 {
1301         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1302                 return;
1303
1304         /*
1305          * Perhaps we can add something smarter here,
1306          * but for now just disabling the radio should do.
1307          */
1308         rt2x00lib_disable_radio(rt2x00dev);
1309
1310         rt2x00dev->intf_ap_count = 0;
1311         rt2x00dev->intf_sta_count = 0;
1312         rt2x00dev->intf_associated = 0;
1313 }
1314
1315 static inline void rt2x00lib_set_if_combinations(struct rt2x00_dev *rt2x00dev)
1316 {
1317         struct ieee80211_iface_limit *if_limit;
1318         struct ieee80211_iface_combination *if_combination;
1319
1320         if (rt2x00dev->ops->max_ap_intf < 2)
1321                 return;
1322
1323         /*
1324          * Build up AP interface limits structure.
1325          */
1326         if_limit = &rt2x00dev->if_limits_ap;
1327         if_limit->max = rt2x00dev->ops->max_ap_intf;
1328         if_limit->types = BIT(NL80211_IFTYPE_AP);
1329 #ifdef CONFIG_MAC80211_MESH
1330         if_limit->types |= BIT(NL80211_IFTYPE_MESH_POINT);
1331 #endif
1332
1333         /*
1334          * Build up AP interface combinations structure.
1335          */
1336         if_combination = &rt2x00dev->if_combinations[IF_COMB_AP];
1337         if_combination->limits = if_limit;
1338         if_combination->n_limits = 1;
1339         if_combination->max_interfaces = if_limit->max;
1340         if_combination->num_different_channels = 1;
1341
1342         /*
1343          * Finally, specify the possible combinations to mac80211.
1344          */
1345         rt2x00dev->hw->wiphy->iface_combinations = rt2x00dev->if_combinations;
1346         rt2x00dev->hw->wiphy->n_iface_combinations = 1;
1347 }
1348
1349 static unsigned int rt2x00dev_extra_tx_headroom(struct rt2x00_dev *rt2x00dev)
1350 {
1351         if (WARN_ON(!rt2x00dev->tx))
1352                 return 0;
1353
1354         if (rt2x00_is_usb(rt2x00dev))
1355                 return rt2x00dev->tx[0].winfo_size + rt2x00dev->tx[0].desc_size;
1356
1357         return rt2x00dev->tx[0].winfo_size;
1358 }
1359
1360 /*
1361  * driver allocation handlers.
1362  */
1363 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1364 {
1365         int retval = -ENOMEM;
1366
1367         /*
1368          * Set possible interface combinations.
1369          */
1370         rt2x00lib_set_if_combinations(rt2x00dev);
1371
1372         /*
1373          * Allocate the driver data memory, if necessary.
1374          */
1375         if (rt2x00dev->ops->drv_data_size > 0) {
1376                 rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size,
1377                                               GFP_KERNEL);
1378                 if (!rt2x00dev->drv_data) {
1379                         retval = -ENOMEM;
1380                         goto exit;
1381                 }
1382         }
1383
1384         spin_lock_init(&rt2x00dev->irqmask_lock);
1385         mutex_init(&rt2x00dev->csr_mutex);
1386         mutex_init(&rt2x00dev->conf_mutex);
1387         INIT_LIST_HEAD(&rt2x00dev->bar_list);
1388         spin_lock_init(&rt2x00dev->bar_list_lock);
1389         hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
1390                      HRTIMER_MODE_REL);
1391
1392         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1393
1394         /*
1395          * Make room for rt2x00_intf inside the per-interface
1396          * structure ieee80211_vif.
1397          */
1398         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1399
1400         /*
1401          * rt2x00 devices can only use the last n bits of the MAC address
1402          * for virtual interfaces.
1403          */
1404         rt2x00dev->hw->wiphy->addr_mask[ETH_ALEN - 1] =
1405                 (rt2x00dev->ops->max_ap_intf - 1);
1406
1407         /*
1408          * Initialize work.
1409          */
1410         rt2x00dev->workqueue =
1411             alloc_ordered_workqueue("%s", 0, wiphy_name(rt2x00dev->hw->wiphy));
1412         if (!rt2x00dev->workqueue) {
1413                 retval = -ENOMEM;
1414                 goto exit;
1415         }
1416
1417         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1418         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1419         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1420
1421         /*
1422          * Let the driver probe the device to detect the capabilities.
1423          */
1424         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1425         if (retval) {
1426                 rt2x00_err(rt2x00dev, "Failed to allocate device\n");
1427                 goto exit;
1428         }
1429
1430         /*
1431          * Allocate queue array.
1432          */
1433         retval = rt2x00queue_allocate(rt2x00dev);
1434         if (retval)
1435                 goto exit;
1436
1437         /* Cache TX headroom value */
1438         rt2x00dev->extra_tx_headroom = rt2x00dev_extra_tx_headroom(rt2x00dev);
1439
1440         /*
1441          * Determine which operating modes are supported, all modes
1442          * which require beaconing, depend on the availability of
1443          * beacon entries.
1444          */
1445         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1446         if (rt2x00dev->bcn->limit > 0)
1447                 rt2x00dev->hw->wiphy->interface_modes |=
1448                     BIT(NL80211_IFTYPE_ADHOC) |
1449 #ifdef CONFIG_MAC80211_MESH
1450                     BIT(NL80211_IFTYPE_MESH_POINT) |
1451 #endif
1452 #ifdef CONFIG_WIRELESS_WDS
1453                     BIT(NL80211_IFTYPE_WDS) |
1454 #endif
1455                     BIT(NL80211_IFTYPE_AP);
1456
1457         rt2x00dev->hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
1458
1459         wiphy_ext_feature_set(rt2x00dev->hw->wiphy,
1460                               NL80211_EXT_FEATURE_CQM_RSSI_LIST);
1461
1462         /*
1463          * Initialize ieee80211 structure.
1464          */
1465         retval = rt2x00lib_probe_hw(rt2x00dev);
1466         if (retval) {
1467                 rt2x00_err(rt2x00dev, "Failed to initialize hw\n");
1468                 goto exit;
1469         }
1470
1471         /*
1472          * Register extra components.
1473          */
1474         rt2x00link_register(rt2x00dev);
1475         rt2x00leds_register(rt2x00dev);
1476         rt2x00debug_register(rt2x00dev);
1477
1478         /*
1479          * Start rfkill polling.
1480          */
1481         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1482                 rt2x00rfkill_register(rt2x00dev);
1483
1484         return 0;
1485
1486 exit:
1487         rt2x00lib_remove_dev(rt2x00dev);
1488
1489         return retval;
1490 }
1491 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1492
1493 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1494 {
1495         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1496
1497         /*
1498          * Stop rfkill polling.
1499          */
1500         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1501                 rt2x00rfkill_unregister(rt2x00dev);
1502
1503         /*
1504          * Disable radio.
1505          */
1506         rt2x00lib_disable_radio(rt2x00dev);
1507
1508         /*
1509          * Stop all work.
1510          */
1511         cancel_work_sync(&rt2x00dev->intf_work);
1512         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1513         cancel_work_sync(&rt2x00dev->sleep_work);
1514
1515         hrtimer_cancel(&rt2x00dev->txstatus_timer);
1516
1517         /*
1518          * Kill the tx status tasklet.
1519          */
1520         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1521         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1522         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1523         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1524         tasklet_kill(&rt2x00dev->autowake_tasklet);
1525
1526         /*
1527          * Uninitialize device.
1528          */
1529         rt2x00lib_uninitialize(rt2x00dev);
1530
1531         if (rt2x00dev->workqueue)
1532                 destroy_workqueue(rt2x00dev->workqueue);
1533
1534         /*
1535          * Free the tx status fifo.
1536          */
1537         kfifo_free(&rt2x00dev->txstatus_fifo);
1538
1539         /*
1540          * Free extra components
1541          */
1542         rt2x00debug_deregister(rt2x00dev);
1543         rt2x00leds_unregister(rt2x00dev);
1544
1545         /*
1546          * Free ieee80211_hw memory.
1547          */
1548         rt2x00lib_remove_hw(rt2x00dev);
1549
1550         /*
1551          * Free firmware image.
1552          */
1553         rt2x00lib_free_firmware(rt2x00dev);
1554
1555         /*
1556          * Free queue structures.
1557          */
1558         rt2x00queue_free(rt2x00dev);
1559
1560         /*
1561          * Free the driver data.
1562          */
1563         kfree(rt2x00dev->drv_data);
1564 }
1565 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1566
1567 /*
1568  * Device state handlers
1569  */
1570 #ifdef CONFIG_PM
1571 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1572 {
1573         rt2x00_dbg(rt2x00dev, "Going to sleep\n");
1574
1575         /*
1576          * Prevent mac80211 from accessing driver while suspended.
1577          */
1578         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1579                 return 0;
1580
1581         /*
1582          * Cleanup as much as possible.
1583          */
1584         rt2x00lib_uninitialize(rt2x00dev);
1585
1586         /*
1587          * Suspend/disable extra components.
1588          */
1589         rt2x00leds_suspend(rt2x00dev);
1590         rt2x00debug_deregister(rt2x00dev);
1591
1592         /*
1593          * Set device mode to sleep for power management,
1594          * on some hardware this call seems to consistently fail.
1595          * From the specifications it is hard to tell why it fails,
1596          * and if this is a "bad thing".
1597          * Overall it is safe to just ignore the failure and
1598          * continue suspending. The only downside is that the
1599          * device will not be in optimal power save mode, but with
1600          * the radio and the other components already disabled the
1601          * device is as good as disabled.
1602          */
1603         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1604                 rt2x00_warn(rt2x00dev, "Device failed to enter sleep state, continue suspending\n");
1605
1606         return 0;
1607 }
1608 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1609
1610 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1611 {
1612         rt2x00_dbg(rt2x00dev, "Waking up\n");
1613
1614         /*
1615          * Restore/enable extra components.
1616          */
1617         rt2x00debug_register(rt2x00dev);
1618         rt2x00leds_resume(rt2x00dev);
1619
1620         /*
1621          * We are ready again to receive requests from mac80211.
1622          */
1623         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1624
1625         return 0;
1626 }
1627 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1628 #endif /* CONFIG_PM */
1629
1630 /*
1631  * rt2x00lib module information.
1632  */
1633 MODULE_AUTHOR(DRV_PROJECT);
1634 MODULE_VERSION(DRV_VERSION);
1635 MODULE_DESCRIPTION("rt2x00 library");
1636 MODULE_LICENSE("GPL");