1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * mac80211 glue code for mac80211 Prism54 drivers
4  *
5  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
6  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * Based on:
10  * - the islsm (softmac prism54) driver, which is:
11  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, 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 <flamingice@sourmilk.net>");
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);
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)
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, u16 queue,
408 		       const struct ieee80211_tx_queue_params *params)
409 {
410 	struct p54_common *priv = dev->priv;
411 	int ret;
412 
413 	mutex_lock(&priv->conf_mutex);
414 	P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
415 		      params->cw_min, params->cw_max, params->txop);
416 	ret = p54_set_edcf(priv);
417 	mutex_unlock(&priv->conf_mutex);
418 	return ret;
419 }
420 
421 static void p54_work(struct work_struct *work)
422 {
423 	struct p54_common *priv = container_of(work, struct p54_common,
424 					       work.work);
425 
426 	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
427 		return ;
428 
429 	/*
430 	 * TODO: walk through tx_queue and do the following tasks
431 	 * 	1. initiate bursts.
432 	 *      2. cancel stuck frames / reset the device if necessary.
433 	 */
434 
435 	mutex_lock(&priv->conf_mutex);
436 	WARN_ON_ONCE(p54_fetch_statistics(priv));
437 	mutex_unlock(&priv->conf_mutex);
438 }
439 
440 static int p54_get_stats(struct ieee80211_hw *dev,
441 			 struct ieee80211_low_level_stats *stats)
442 {
443 	struct p54_common *priv = dev->priv;
444 
445 	memcpy(stats, &priv->stats, sizeof(*stats));
446 	return 0;
447 }
448 
449 static void p54_bss_info_changed(struct ieee80211_hw *dev,
450 				 struct ieee80211_vif *vif,
451 				 struct ieee80211_bss_conf *info,
452 				 u32 changed)
453 {
454 	struct p54_common *priv = dev->priv;
455 
456 	mutex_lock(&priv->conf_mutex);
457 	if (changed & BSS_CHANGED_BSSID) {
458 		memcpy(priv->bssid, info->bssid, ETH_ALEN);
459 		p54_setup_mac(priv);
460 	}
461 
462 	if (changed & BSS_CHANGED_BEACON) {
463 		p54_scan(priv, P54_SCAN_EXIT, 0);
464 		p54_setup_mac(priv);
465 		p54_beacon_update(priv, vif);
466 		p54_set_edcf(priv);
467 	}
468 
469 	if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
470 		priv->use_short_slot = info->use_short_slot;
471 		p54_set_edcf(priv);
472 	}
473 	if (changed & BSS_CHANGED_BASIC_RATES) {
474 		if (dev->conf.chandef.chan->band == NL80211_BAND_5GHZ)
475 			priv->basic_rate_mask = (info->basic_rates << 4);
476 		else
477 			priv->basic_rate_mask = info->basic_rates;
478 		p54_setup_mac(priv);
479 		if (priv->fw_var >= 0x500)
480 			p54_scan(priv, P54_SCAN_EXIT, 0);
481 	}
482 	if (changed & BSS_CHANGED_ASSOC) {
483 		if (info->assoc) {
484 			priv->aid = info->aid;
485 			priv->wakeup_timer = info->beacon_int *
486 					     info->dtim_period * 5;
487 			p54_setup_mac(priv);
488 		} else {
489 			priv->wakeup_timer = 500;
490 			priv->aid = 0;
491 		}
492 	}
493 
494 	mutex_unlock(&priv->conf_mutex);
495 }
496 
497 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
498 		       struct ieee80211_vif *vif, struct ieee80211_sta *sta,
499 		       struct ieee80211_key_conf *key)
500 {
501 	struct p54_common *priv = dev->priv;
502 	int slot, ret = 0;
503 	u8 algo = 0;
504 	u8 *addr = NULL;
505 
506 	if (modparam_nohwcrypt)
507 		return -EOPNOTSUPP;
508 
509 	if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
510 		/*
511 		 * Unfortunately most/all firmwares are trying to decrypt
512 		 * incoming management frames if a suitable key can be found.
513 		 * However, in doing so the data in these frames gets
514 		 * corrupted. So, we can't have firmware supported crypto
515 		 * offload in this case.
516 		 */
517 		return -EOPNOTSUPP;
518 	}
519 
520 	mutex_lock(&priv->conf_mutex);
521 	if (cmd == SET_KEY) {
522 		switch (key->cipher) {
523 		case WLAN_CIPHER_SUITE_TKIP:
524 			if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
525 			      BR_DESC_PRIV_CAP_TKIP))) {
526 				ret = -EOPNOTSUPP;
527 				goto out_unlock;
528 			}
529 			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
530 			algo = P54_CRYPTO_TKIPMICHAEL;
531 			break;
532 		case WLAN_CIPHER_SUITE_WEP40:
533 		case WLAN_CIPHER_SUITE_WEP104:
534 			if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
535 				ret = -EOPNOTSUPP;
536 				goto out_unlock;
537 			}
538 			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
539 			algo = P54_CRYPTO_WEP;
540 			break;
541 		case WLAN_CIPHER_SUITE_CCMP:
542 			if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
543 				ret = -EOPNOTSUPP;
544 				goto out_unlock;
545 			}
546 			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
547 			algo = P54_CRYPTO_AESCCMP;
548 			break;
549 		default:
550 			ret = -EOPNOTSUPP;
551 			goto out_unlock;
552 		}
553 		slot = bitmap_find_free_region(priv->used_rxkeys,
554 					       priv->rx_keycache_size, 0);
555 
556 		if (slot < 0) {
557 			/*
558 			 * The device supports the chosen algorithm, but the
559 			 * firmware does not provide enough key slots to store
560 			 * all of them.
561 			 * But encryption offload for outgoing frames is always
562 			 * possible, so we just pretend that the upload was
563 			 * successful and do the decryption in software.
564 			 */
565 
566 			/* mark the key as invalid. */
567 			key->hw_key_idx = 0xff;
568 			goto out_unlock;
569 		}
570 
571 		key->flags |= IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
572 	} else {
573 		slot = key->hw_key_idx;
574 
575 		if (slot == 0xff) {
576 			/* This key was not uploaded into the rx key cache. */
577 
578 			goto out_unlock;
579 		}
580 
581 		bitmap_release_region(priv->used_rxkeys, slot, 0);
582 		algo = 0;
583 	}
584 
585 	if (sta)
586 		addr = sta->addr;
587 
588 	ret = p54_upload_key(priv, algo, slot, key->keyidx,
589 			     key->keylen, addr, key->key);
590 	if (ret) {
591 		bitmap_release_region(priv->used_rxkeys, slot, 0);
592 		ret = -EOPNOTSUPP;
593 		goto out_unlock;
594 	}
595 
596 	key->hw_key_idx = slot;
597 
598 out_unlock:
599 	mutex_unlock(&priv->conf_mutex);
600 	return ret;
601 }
602 
603 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
604 				struct survey_info *survey)
605 {
606 	struct p54_common *priv = dev->priv;
607 	struct ieee80211_channel *chan;
608 	int err, tries;
609 	bool in_use = false;
610 
611 	if (idx >= priv->chan_num)
612 		return -ENOENT;
613 
614 #define MAX_TRIES 1
615 	for (tries = 0; tries < MAX_TRIES; tries++) {
616 		chan = priv->curchan;
617 		if (chan && chan->hw_value == idx) {
618 			mutex_lock(&priv->conf_mutex);
619 			err = p54_wait_for_stats(dev);
620 			mutex_unlock(&priv->conf_mutex);
621 			if (err)
622 				return err;
623 
624 			in_use = true;
625 		}
626 
627 		memcpy(survey, &priv->survey[idx], sizeof(*survey));
628 
629 		if (in_use) {
630 			/* test if the reported statistics are valid. */
631 			if  (survey->time != 0) {
632 				survey->filled |= SURVEY_INFO_IN_USE;
633 			} else {
634 				/*
635 				 * hw/fw has not accumulated enough sample sets.
636 				 * Wait for 100ms, this ought to be enough to
637 				 * to get at least one non-null set of channel
638 				 * usage statistics.
639 				 */
640 				msleep(100);
641 				continue;
642 			}
643 		}
644 		return 0;
645 	}
646 	return -ETIMEDOUT;
647 #undef MAX_TRIES
648 }
649 
650 static unsigned int p54_flush_count(struct p54_common *priv)
651 {
652 	unsigned int total = 0, i;
653 
654 	BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
655 
656 	/*
657 	 * Because the firmware has the sole control over any frames
658 	 * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
659 	 * don't really count as pending or active.
660 	 */
661 	for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
662 		total += priv->tx_stats[i].len;
663 	return total;
664 }
665 
666 static void p54_flush(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
667 		      u32 queues, bool drop)
668 {
669 	struct p54_common *priv = dev->priv;
670 	unsigned int total, i;
671 
672 	/*
673 	 * Currently, it wouldn't really matter if we wait for one second
674 	 * or 15 minutes. But once someone gets around and completes the
675 	 * TODOs [ancel stuck frames / reset device] in p54_work, it will
676 	 * suddenly make sense to wait that long.
677 	 */
678 	i = P54_STATISTICS_UPDATE * 2 / 20;
679 
680 	/*
681 	 * In this case no locking is required because as we speak the
682 	 * queues have already been stopped and no new frames can sneak
683 	 * up from behind.
684 	 */
685 	while ((total = p54_flush_count(priv) && i--)) {
686 		/* waste time */
687 		msleep(20);
688 	}
689 
690 	WARN(total, "tx flush timeout, unresponsive firmware");
691 }
692 
693 static void p54_set_coverage_class(struct ieee80211_hw *dev,
694 				   s16 coverage_class)
695 {
696 	struct p54_common *priv = dev->priv;
697 
698 	mutex_lock(&priv->conf_mutex);
699 	/* support all coverage class values as in 802.11-2007 Table 7-27 */
700 	priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
701 	p54_set_edcf(priv);
702 	mutex_unlock(&priv->conf_mutex);
703 }
704 
705 static const struct ieee80211_ops p54_ops = {
706 	.tx			= p54_tx_80211,
707 	.start			= p54_start,
708 	.stop			= p54_stop,
709 	.add_interface		= p54_add_interface,
710 	.remove_interface	= p54_remove_interface,
711 	.set_tim		= p54_set_tim,
712 	.sta_notify		= p54_sta_notify,
713 	.sta_add		= p54_sta_add_remove,
714 	.sta_remove		= p54_sta_add_remove,
715 	.set_key		= p54_set_key,
716 	.config			= p54_config,
717 	.flush			= p54_flush,
718 	.bss_info_changed	= p54_bss_info_changed,
719 	.prepare_multicast	= p54_prepare_multicast,
720 	.configure_filter	= p54_configure_filter,
721 	.conf_tx		= p54_conf_tx,
722 	.get_stats		= p54_get_stats,
723 	.get_survey		= p54_get_survey,
724 	.set_coverage_class	= p54_set_coverage_class,
725 };
726 
727 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
728 {
729 	struct ieee80211_hw *dev;
730 	struct p54_common *priv;
731 
732 	dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
733 	if (!dev)
734 		return NULL;
735 
736 	priv = dev->priv;
737 	priv->hw = dev;
738 	priv->mode = NL80211_IFTYPE_UNSPECIFIED;
739 	priv->basic_rate_mask = 0x15f;
740 	spin_lock_init(&priv->tx_stats_lock);
741 	skb_queue_head_init(&priv->tx_queue);
742 	skb_queue_head_init(&priv->tx_pending);
743 	ieee80211_hw_set(dev, REPORTS_TX_ACK_STATUS);
744 	ieee80211_hw_set(dev, MFP_CAPABLE);
745 	ieee80211_hw_set(dev, PS_NULLFUNC_STACK);
746 	ieee80211_hw_set(dev, SUPPORTS_PS);
747 	ieee80211_hw_set(dev, RX_INCLUDES_FCS);
748 	ieee80211_hw_set(dev, SIGNAL_DBM);
749 
750 	dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
751 				      BIT(NL80211_IFTYPE_ADHOC) |
752 				      BIT(NL80211_IFTYPE_AP) |
753 				      BIT(NL80211_IFTYPE_MESH_POINT);
754 
755 	priv->beacon_req_id = cpu_to_le32(0);
756 	priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
757 	priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
758 	priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
759 	priv->tx_stats[P54_QUEUE_CAB].limit = 3;
760 	priv->tx_stats[P54_QUEUE_DATA].limit = 5;
761 	dev->queues = 1;
762 	priv->noise = -94;
763 	/*
764 	 * We support at most 8 tries no matter which rate they're at,
765 	 * we cannot support max_rates * max_rate_tries as we set it
766 	 * here, but setting it correctly to 4/2 or so would limit us
767 	 * artificially if the RC algorithm wants just two rates, so
768 	 * let's say 4/7, we'll redistribute it at TX time, see the
769 	 * comments there.
770 	 */
771 	dev->max_rates = 4;
772 	dev->max_rate_tries = 7;
773 	dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
774 				 sizeof(struct p54_tx_data);
775 
776 	/*
777 	 * For now, disable PS by default because it affects
778 	 * link stability significantly.
779 	 */
780 	dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
781 
782 	mutex_init(&priv->conf_mutex);
783 	mutex_init(&priv->eeprom_mutex);
784 	init_completion(&priv->stat_comp);
785 	init_completion(&priv->eeprom_comp);
786 	init_completion(&priv->beacon_comp);
787 	INIT_DELAYED_WORK(&priv->work, p54_work);
788 
789 	eth_broadcast_addr(priv->mc_maclist[0]);
790 	priv->curchan = NULL;
791 	p54_reset_stats(priv);
792 	return dev;
793 }
794 EXPORT_SYMBOL_GPL(p54_init_common);
795 
796 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
797 {
798 	struct p54_common __maybe_unused *priv = dev->priv;
799 	int err;
800 
801 	err = ieee80211_register_hw(dev);
802 	if (err) {
803 		dev_err(pdev, "Cannot register device (%d).\n", err);
804 		return err;
805 	}
806 	priv->registered = true;
807 
808 #ifdef CONFIG_P54_LEDS
809 	err = p54_init_leds(priv);
810 	if (err) {
811 		p54_unregister_common(dev);
812 		return err;
813 	}
814 #endif /* CONFIG_P54_LEDS */
815 
816 	dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
817 	return 0;
818 }
819 EXPORT_SYMBOL_GPL(p54_register_common);
820 
821 void p54_free_common(struct ieee80211_hw *dev)
822 {
823 	struct p54_common *priv = dev->priv;
824 	unsigned int i;
825 
826 	for (i = 0; i < NUM_NL80211_BANDS; i++)
827 		kfree(priv->band_table[i]);
828 
829 	kfree(priv->iq_autocal);
830 	kfree(priv->output_limit);
831 	kfree(priv->curve_data);
832 	kfree(priv->rssi_db);
833 	kfree(priv->used_rxkeys);
834 	kfree(priv->survey);
835 	priv->iq_autocal = NULL;
836 	priv->output_limit = NULL;
837 	priv->curve_data = NULL;
838 	priv->rssi_db = NULL;
839 	priv->used_rxkeys = NULL;
840 	priv->survey = NULL;
841 	ieee80211_free_hw(dev);
842 }
843 EXPORT_SYMBOL_GPL(p54_free_common);
844 
845 void p54_unregister_common(struct ieee80211_hw *dev)
846 {
847 	struct p54_common *priv = dev->priv;
848 
849 	if (priv->registered) {
850 		priv->registered = false;
851 #ifdef CONFIG_P54_LEDS
852 		p54_unregister_leds(priv);
853 #endif /* CONFIG_P54_LEDS */
854 		ieee80211_unregister_hw(dev);
855 	}
856 
857 	mutex_destroy(&priv->conf_mutex);
858 	mutex_destroy(&priv->eeprom_mutex);
859 }
860 EXPORT_SYMBOL_GPL(p54_unregister_common);
861