1 /*
2  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
3  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2
7  * as published by the Free Software Foundation
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  */
14 
15 #include "mt7601u.h"
16 #include "trace.h"
17 #include <linux/etherdevice.h>
18 
19 static void
20 mt76_mac_process_tx_rate(struct ieee80211_tx_rate *txrate, u16 rate)
21 {
22 	u8 idx = FIELD_GET(MT_TXWI_RATE_MCS, rate);
23 
24 	txrate->idx = 0;
25 	txrate->flags = 0;
26 	txrate->count = 1;
27 
28 	switch (FIELD_GET(MT_TXWI_RATE_PHY_MODE, rate)) {
29 	case MT_PHY_TYPE_OFDM:
30 		txrate->idx = idx + 4;
31 		return;
32 	case MT_PHY_TYPE_CCK:
33 		if (idx >= 8)
34 			idx -= 8;
35 
36 		txrate->idx = idx;
37 		return;
38 	case MT_PHY_TYPE_HT_GF:
39 		txrate->flags |= IEEE80211_TX_RC_GREEN_FIELD;
40 		/* fall through */
41 	case MT_PHY_TYPE_HT:
42 		txrate->flags |= IEEE80211_TX_RC_MCS;
43 		txrate->idx = idx;
44 		break;
45 	default:
46 		WARN_ON(1);
47 		return;
48 	}
49 
50 	if (FIELD_GET(MT_TXWI_RATE_BW, rate) == MT_PHY_BW_40)
51 		txrate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
52 
53 	if (rate & MT_TXWI_RATE_SGI)
54 		txrate->flags |= IEEE80211_TX_RC_SHORT_GI;
55 }
56 
57 static void
58 mt76_mac_fill_tx_status(struct mt7601u_dev *dev, struct ieee80211_tx_info *info,
59 			struct mt76_tx_status *st)
60 {
61 	struct ieee80211_tx_rate *rate = info->status.rates;
62 	int cur_idx, last_rate;
63 	int i;
64 
65 	last_rate = min_t(int, st->retry, IEEE80211_TX_MAX_RATES - 1);
66 	mt76_mac_process_tx_rate(&rate[last_rate], st->rate);
67 	if (last_rate < IEEE80211_TX_MAX_RATES - 1)
68 		rate[last_rate + 1].idx = -1;
69 
70 	cur_idx = rate[last_rate].idx + st->retry;
71 	for (i = 0; i <= last_rate; i++) {
72 		rate[i].flags = rate[last_rate].flags;
73 		rate[i].idx = max_t(int, 0, cur_idx - i);
74 		rate[i].count = 1;
75 	}
76 
77 	if (last_rate > 0)
78 		rate[last_rate - 1].count = st->retry + 1 - last_rate;
79 
80 	info->status.ampdu_len = 1;
81 	info->status.ampdu_ack_len = st->success;
82 
83 	if (st->is_probe)
84 		info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
85 
86 	if (st->aggr)
87 		info->flags |= IEEE80211_TX_CTL_AMPDU |
88 			       IEEE80211_TX_STAT_AMPDU;
89 
90 	if (!st->ack_req)
91 		info->flags |= IEEE80211_TX_CTL_NO_ACK;
92 	else if (st->success)
93 		info->flags |= IEEE80211_TX_STAT_ACK;
94 }
95 
96 u16 mt76_mac_tx_rate_val(struct mt7601u_dev *dev,
97 			 const struct ieee80211_tx_rate *rate, u8 *nss_val)
98 {
99 	u16 rateval;
100 	u8 phy, rate_idx;
101 	u8 nss = 1;
102 	u8 bw = 0;
103 
104 	if (rate->flags & IEEE80211_TX_RC_MCS) {
105 		rate_idx = rate->idx;
106 		nss = 1 + (rate->idx >> 3);
107 		phy = MT_PHY_TYPE_HT;
108 		if (rate->flags & IEEE80211_TX_RC_GREEN_FIELD)
109 			phy = MT_PHY_TYPE_HT_GF;
110 		if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
111 			bw = 1;
112 	} else {
113 		const struct ieee80211_rate *r;
114 		int band = dev->chandef.chan->band;
115 		u16 val;
116 
117 		r = &dev->hw->wiphy->bands[band]->bitrates[rate->idx];
118 		if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
119 			val = r->hw_value_short;
120 		else
121 			val = r->hw_value;
122 
123 		phy = val >> 8;
124 		rate_idx = val & 0xff;
125 		bw = 0;
126 	}
127 
128 	rateval = FIELD_PREP(MT_RXWI_RATE_MCS, rate_idx);
129 	rateval |= FIELD_PREP(MT_RXWI_RATE_PHY, phy);
130 	rateval |= FIELD_PREP(MT_RXWI_RATE_BW, bw);
131 	if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
132 		rateval |= MT_RXWI_RATE_SGI;
133 
134 	*nss_val = nss;
135 	return rateval;
136 }
137 
138 void mt76_mac_wcid_set_rate(struct mt7601u_dev *dev, struct mt76_wcid *wcid,
139 			    const struct ieee80211_tx_rate *rate)
140 {
141 	unsigned long flags;
142 
143 	spin_lock_irqsave(&dev->lock, flags);
144 	wcid->tx_rate = mt76_mac_tx_rate_val(dev, rate, &wcid->tx_rate_nss);
145 	wcid->tx_rate_set = true;
146 	spin_unlock_irqrestore(&dev->lock, flags);
147 }
148 
149 struct mt76_tx_status mt7601u_mac_fetch_tx_status(struct mt7601u_dev *dev)
150 {
151 	struct mt76_tx_status stat = {};
152 	u32 val;
153 
154 	val = mt7601u_rr(dev, MT_TX_STAT_FIFO);
155 	stat.valid = !!(val & MT_TX_STAT_FIFO_VALID);
156 	stat.success = !!(val & MT_TX_STAT_FIFO_SUCCESS);
157 	stat.aggr = !!(val & MT_TX_STAT_FIFO_AGGR);
158 	stat.ack_req = !!(val & MT_TX_STAT_FIFO_ACKREQ);
159 	stat.pktid = FIELD_GET(MT_TX_STAT_FIFO_PID_TYPE, val);
160 	stat.wcid = FIELD_GET(MT_TX_STAT_FIFO_WCID, val);
161 	stat.rate = FIELD_GET(MT_TX_STAT_FIFO_RATE, val);
162 
163 	return stat;
164 }
165 
166 void mt76_send_tx_status(struct mt7601u_dev *dev, struct mt76_tx_status *stat)
167 {
168 	struct ieee80211_tx_info info = {};
169 	struct ieee80211_sta *sta = NULL;
170 	struct mt76_wcid *wcid = NULL;
171 	void *msta;
172 
173 	rcu_read_lock();
174 	if (stat->wcid < ARRAY_SIZE(dev->wcid))
175 		wcid = rcu_dereference(dev->wcid[stat->wcid]);
176 
177 	if (wcid) {
178 		msta = container_of(wcid, struct mt76_sta, wcid);
179 		sta = container_of(msta, struct ieee80211_sta,
180 				   drv_priv);
181 	}
182 
183 	mt76_mac_fill_tx_status(dev, &info, stat);
184 
185 	spin_lock_bh(&dev->mac_lock);
186 	ieee80211_tx_status_noskb(dev->hw, sta, &info);
187 	spin_unlock_bh(&dev->mac_lock);
188 
189 	rcu_read_unlock();
190 }
191 
192 void mt7601u_mac_set_protection(struct mt7601u_dev *dev, bool legacy_prot,
193 				int ht_mode)
194 {
195 	int mode = ht_mode & IEEE80211_HT_OP_MODE_PROTECTION;
196 	bool non_gf = !!(ht_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
197 	u32 prot[6];
198 	bool ht_rts[4] = {};
199 	int i;
200 
201 	prot[0] = MT_PROT_NAV_SHORT |
202 		  MT_PROT_TXOP_ALLOW_ALL |
203 		  MT_PROT_RTS_THR_EN;
204 	prot[1] = prot[0];
205 	if (legacy_prot)
206 		prot[1] |= MT_PROT_CTRL_CTS2SELF;
207 
208 	prot[2] = prot[4] = MT_PROT_NAV_SHORT | MT_PROT_TXOP_ALLOW_BW20;
209 	prot[3] = prot[5] = MT_PROT_NAV_SHORT | MT_PROT_TXOP_ALLOW_ALL;
210 
211 	if (legacy_prot) {
212 		prot[2] |= MT_PROT_RATE_CCK_11;
213 		prot[3] |= MT_PROT_RATE_CCK_11;
214 		prot[4] |= MT_PROT_RATE_CCK_11;
215 		prot[5] |= MT_PROT_RATE_CCK_11;
216 	} else {
217 		prot[2] |= MT_PROT_RATE_OFDM_24;
218 		prot[3] |= MT_PROT_RATE_DUP_OFDM_24;
219 		prot[4] |= MT_PROT_RATE_OFDM_24;
220 		prot[5] |= MT_PROT_RATE_DUP_OFDM_24;
221 	}
222 
223 	switch (mode) {
224 	case IEEE80211_HT_OP_MODE_PROTECTION_NONE:
225 		break;
226 
227 	case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER:
228 		ht_rts[0] = ht_rts[1] = ht_rts[2] = ht_rts[3] = true;
229 		break;
230 
231 	case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ:
232 		ht_rts[1] = ht_rts[3] = true;
233 		break;
234 
235 	case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED:
236 		ht_rts[0] = ht_rts[1] = ht_rts[2] = ht_rts[3] = true;
237 		break;
238 	}
239 
240 	if (non_gf)
241 		ht_rts[2] = ht_rts[3] = true;
242 
243 	for (i = 0; i < 4; i++)
244 		if (ht_rts[i])
245 			prot[i + 2] |= MT_PROT_CTRL_RTS_CTS;
246 
247 	for (i = 0; i < 6; i++)
248 		mt7601u_wr(dev, MT_CCK_PROT_CFG + i * 4, prot[i]);
249 }
250 
251 void mt7601u_mac_set_short_preamble(struct mt7601u_dev *dev, bool short_preamb)
252 {
253 	if (short_preamb)
254 		mt76_set(dev, MT_AUTO_RSP_CFG, MT_AUTO_RSP_PREAMB_SHORT);
255 	else
256 		mt76_clear(dev, MT_AUTO_RSP_CFG, MT_AUTO_RSP_PREAMB_SHORT);
257 }
258 
259 void mt7601u_mac_config_tsf(struct mt7601u_dev *dev, bool enable, int interval)
260 {
261 	u32 val = mt7601u_rr(dev, MT_BEACON_TIME_CFG);
262 
263 	val &= ~(MT_BEACON_TIME_CFG_TIMER_EN |
264 		 MT_BEACON_TIME_CFG_SYNC_MODE |
265 		 MT_BEACON_TIME_CFG_TBTT_EN);
266 
267 	if (!enable) {
268 		mt7601u_wr(dev, MT_BEACON_TIME_CFG, val);
269 		return;
270 	}
271 
272 	val &= ~MT_BEACON_TIME_CFG_INTVAL;
273 	val |= FIELD_PREP(MT_BEACON_TIME_CFG_INTVAL, interval << 4) |
274 		MT_BEACON_TIME_CFG_TIMER_EN |
275 		MT_BEACON_TIME_CFG_SYNC_MODE |
276 		MT_BEACON_TIME_CFG_TBTT_EN;
277 }
278 
279 static void mt7601u_check_mac_err(struct mt7601u_dev *dev)
280 {
281 	u32 val = mt7601u_rr(dev, 0x10f4);
282 
283 	if (!(val & BIT(29)) || !(val & (BIT(7) | BIT(5))))
284 		return;
285 
286 	dev_err(dev->dev, "Error: MAC specific condition occurred\n");
287 
288 	mt76_set(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_RESET_CSR);
289 	udelay(10);
290 	mt76_clear(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_RESET_CSR);
291 }
292 
293 void mt7601u_mac_work(struct work_struct *work)
294 {
295 	struct mt7601u_dev *dev = container_of(work, struct mt7601u_dev,
296 					       mac_work.work);
297 	struct {
298 		u32 addr_base;
299 		u32 span;
300 		u64 *stat_base;
301 	} spans[] = {
302 		{ MT_RX_STA_CNT0,	3,	dev->stats.rx_stat },
303 		{ MT_TX_STA_CNT0,	3,	dev->stats.tx_stat },
304 		{ MT_TX_AGG_STAT,	1,	dev->stats.aggr_stat },
305 		{ MT_MPDU_DENSITY_CNT,	1,	dev->stats.zero_len_del },
306 		{ MT_TX_AGG_CNT_BASE0,	8,	&dev->stats.aggr_n[0] },
307 		{ MT_TX_AGG_CNT_BASE1,	8,	&dev->stats.aggr_n[16] },
308 	};
309 	u32 sum, n;
310 	int i, j, k;
311 
312 	/* Note: using MCU_RANDOM_READ is actually slower then reading all the
313 	 *	 registers by hand.  MCU takes ca. 20ms to complete read of 24
314 	 *	 registers while reading them one by one will takes roughly
315 	 *	 24*200us =~ 5ms.
316 	 */
317 
318 	k = 0;
319 	n = 0;
320 	sum = 0;
321 	for (i = 0; i < ARRAY_SIZE(spans); i++)
322 		for (j = 0; j < spans[i].span; j++) {
323 			u32 val = mt7601u_rr(dev, spans[i].addr_base + j * 4);
324 
325 			spans[i].stat_base[j * 2] += val & 0xffff;
326 			spans[i].stat_base[j * 2 + 1] += val >> 16;
327 
328 			/* Calculate average AMPDU length */
329 			if (spans[i].addr_base != MT_TX_AGG_CNT_BASE0 &&
330 			    spans[i].addr_base != MT_TX_AGG_CNT_BASE1)
331 				continue;
332 
333 			n += (val >> 16) + (val & 0xffff);
334 			sum += (val & 0xffff) * (1 + k * 2) +
335 				(val >> 16) * (2 + k * 2);
336 			k++;
337 		}
338 
339 	atomic_set(&dev->avg_ampdu_len, n ? DIV_ROUND_CLOSEST(sum, n) : 1);
340 
341 	mt7601u_check_mac_err(dev);
342 
343 	ieee80211_queue_delayed_work(dev->hw, &dev->mac_work, 10 * HZ);
344 }
345 
346 void
347 mt7601u_mac_wcid_setup(struct mt7601u_dev *dev, u8 idx, u8 vif_idx, u8 *mac)
348 {
349 	u8 zmac[ETH_ALEN] = {};
350 	u32 attr;
351 
352 	attr = FIELD_PREP(MT_WCID_ATTR_BSS_IDX, vif_idx & 7) |
353 	       FIELD_PREP(MT_WCID_ATTR_BSS_IDX_EXT, !!(vif_idx & 8));
354 
355 	mt76_wr(dev, MT_WCID_ATTR(idx), attr);
356 
357 	if (mac)
358 		memcpy(zmac, mac, sizeof(zmac));
359 
360 	mt7601u_addr_wr(dev, MT_WCID_ADDR(idx), zmac);
361 }
362 
363 void mt7601u_mac_set_ampdu_factor(struct mt7601u_dev *dev)
364 {
365 	struct ieee80211_sta *sta;
366 	struct mt76_wcid *wcid;
367 	void *msta;
368 	u8 min_factor = 3;
369 	int i;
370 
371 	rcu_read_lock();
372 	for (i = 0; i < ARRAY_SIZE(dev->wcid); i++) {
373 		wcid = rcu_dereference(dev->wcid[i]);
374 		if (!wcid)
375 			continue;
376 
377 		msta = container_of(wcid, struct mt76_sta, wcid);
378 		sta = container_of(msta, struct ieee80211_sta, drv_priv);
379 
380 		min_factor = min(min_factor, sta->ht_cap.ampdu_factor);
381 	}
382 	rcu_read_unlock();
383 
384 	mt7601u_wr(dev, MT_MAX_LEN_CFG, 0xa0fff |
385 		   FIELD_PREP(MT_MAX_LEN_CFG_AMPDU, min_factor));
386 }
387 
388 static void
389 mt76_mac_process_rate(struct ieee80211_rx_status *status, u16 rate)
390 {
391 	u8 idx = FIELD_GET(MT_RXWI_RATE_MCS, rate);
392 
393 	switch (FIELD_GET(MT_RXWI_RATE_PHY, rate)) {
394 	case MT_PHY_TYPE_OFDM:
395 		if (WARN_ON(idx >= 8))
396 			idx = 0;
397 		idx += 4;
398 
399 		status->rate_idx = idx;
400 		return;
401 	case MT_PHY_TYPE_CCK:
402 		if (idx >= 8) {
403 			idx -= 8;
404 			status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
405 		}
406 
407 		if (WARN_ON(idx >= 4))
408 			idx = 0;
409 
410 		status->rate_idx = idx;
411 		return;
412 	case MT_PHY_TYPE_HT_GF:
413 		status->enc_flags |= RX_ENC_FLAG_HT_GF;
414 		/* fall through */
415 	case MT_PHY_TYPE_HT:
416 		status->encoding = RX_ENC_HT;
417 		status->rate_idx = idx;
418 		break;
419 	default:
420 		WARN_ON(1);
421 		return;
422 	}
423 
424 	if (rate & MT_RXWI_RATE_SGI)
425 		status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
426 
427 	if (rate & MT_RXWI_RATE_STBC)
428 		status->enc_flags |= 1 << RX_ENC_FLAG_STBC_SHIFT;
429 
430 	if (rate & MT_RXWI_RATE_BW)
431 		status->bw = RATE_INFO_BW_40;
432 }
433 
434 static void
435 mt7601u_rx_monitor_beacon(struct mt7601u_dev *dev, struct mt7601u_rxwi *rxwi,
436 			  u16 rate, int rssi)
437 {
438 	dev->bcn_freq_off = rxwi->freq_off;
439 	dev->bcn_phy_mode = FIELD_GET(MT_RXWI_RATE_PHY, rate);
440 	dev->avg_rssi = (dev->avg_rssi * 15) / 16 + (rssi << 8);
441 }
442 
443 static int
444 mt7601u_rx_is_our_beacon(struct mt7601u_dev *dev, u8 *data)
445 {
446 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data;
447 
448 	return ieee80211_is_beacon(hdr->frame_control) &&
449 		ether_addr_equal(hdr->addr2, dev->ap_bssid);
450 }
451 
452 u32 mt76_mac_process_rx(struct mt7601u_dev *dev, struct sk_buff *skb,
453 			u8 *data, void *rxi)
454 {
455 	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
456 	struct mt7601u_rxwi *rxwi = rxi;
457 	u32 len, ctl = le32_to_cpu(rxwi->ctl);
458 	u16 rate = le16_to_cpu(rxwi->rate);
459 	int rssi;
460 
461 	len = FIELD_GET(MT_RXWI_CTL_MPDU_LEN, ctl);
462 	if (len < 10)
463 		return 0;
464 
465 	if (rxwi->rxinfo & cpu_to_le32(MT_RXINFO_DECRYPT)) {
466 		status->flag |= RX_FLAG_DECRYPTED;
467 		status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
468 	}
469 
470 	status->chains = BIT(0);
471 	rssi = mt7601u_phy_get_rssi(dev, rxwi, rate);
472 	status->chain_signal[0] = status->signal = rssi;
473 	status->freq = dev->chandef.chan->center_freq;
474 	status->band = dev->chandef.chan->band;
475 
476 	mt76_mac_process_rate(status, rate);
477 
478 	spin_lock_bh(&dev->con_mon_lock);
479 	if (mt7601u_rx_is_our_beacon(dev, data))
480 		mt7601u_rx_monitor_beacon(dev, rxwi, rate, rssi);
481 	else if (rxwi->rxinfo & cpu_to_le32(MT_RXINFO_U2M))
482 		dev->avg_rssi = (dev->avg_rssi * 15) / 16 + (rssi << 8);
483 	spin_unlock_bh(&dev->con_mon_lock);
484 
485 	return len;
486 }
487 
488 static enum mt76_cipher_type
489 mt76_mac_get_key_info(struct ieee80211_key_conf *key, u8 *key_data)
490 {
491 	memset(key_data, 0, 32);
492 	if (!key)
493 		return MT_CIPHER_NONE;
494 
495 	if (key->keylen > 32)
496 		return MT_CIPHER_NONE;
497 
498 	memcpy(key_data, key->key, key->keylen);
499 
500 	switch (key->cipher) {
501 	case WLAN_CIPHER_SUITE_WEP40:
502 		return MT_CIPHER_WEP40;
503 	case WLAN_CIPHER_SUITE_WEP104:
504 		return MT_CIPHER_WEP104;
505 	case WLAN_CIPHER_SUITE_TKIP:
506 		return MT_CIPHER_TKIP;
507 	case WLAN_CIPHER_SUITE_CCMP:
508 		return MT_CIPHER_AES_CCMP;
509 	default:
510 		return MT_CIPHER_NONE;
511 	}
512 }
513 
514 int mt76_mac_wcid_set_key(struct mt7601u_dev *dev, u8 idx,
515 			  struct ieee80211_key_conf *key)
516 {
517 	enum mt76_cipher_type cipher;
518 	u8 key_data[32];
519 	u8 iv_data[8];
520 	u32 val;
521 
522 	cipher = mt76_mac_get_key_info(key, key_data);
523 	if (cipher == MT_CIPHER_NONE && key)
524 		return -EINVAL;
525 
526 	trace_set_key(dev, idx);
527 
528 	mt7601u_wr_copy(dev, MT_WCID_KEY(idx), key_data, sizeof(key_data));
529 
530 	memset(iv_data, 0, sizeof(iv_data));
531 	if (key) {
532 		iv_data[3] = key->keyidx << 6;
533 		if (cipher >= MT_CIPHER_TKIP) {
534 			/* Note: start with 1 to comply with spec,
535 			 *	 (see comment on common/cmm_wpa.c:4291).
536 			 */
537 			iv_data[0] |= 1;
538 			iv_data[3] |= 0x20;
539 		}
540 	}
541 	mt7601u_wr_copy(dev, MT_WCID_IV(idx), iv_data, sizeof(iv_data));
542 
543 	val = mt7601u_rr(dev, MT_WCID_ATTR(idx));
544 	val &= ~MT_WCID_ATTR_PKEY_MODE & ~MT_WCID_ATTR_PKEY_MODE_EXT;
545 	val |= FIELD_PREP(MT_WCID_ATTR_PKEY_MODE, cipher & 7) |
546 	       FIELD_PREP(MT_WCID_ATTR_PKEY_MODE_EXT, cipher >> 3);
547 	val &= ~MT_WCID_ATTR_PAIRWISE;
548 	val |= MT_WCID_ATTR_PAIRWISE *
549 		!!(key && key->flags & IEEE80211_KEY_FLAG_PAIRWISE);
550 	mt7601u_wr(dev, MT_WCID_ATTR(idx), val);
551 
552 	return 0;
553 }
554 
555 int mt76_mac_shared_key_setup(struct mt7601u_dev *dev, u8 vif_idx, u8 key_idx,
556 			      struct ieee80211_key_conf *key)
557 {
558 	enum mt76_cipher_type cipher;
559 	u8 key_data[32];
560 	u32 val;
561 
562 	cipher = mt76_mac_get_key_info(key, key_data);
563 	if (cipher == MT_CIPHER_NONE && key)
564 		return -EINVAL;
565 
566 	trace_set_shared_key(dev, vif_idx, key_idx);
567 
568 	mt7601u_wr_copy(dev, MT_SKEY(vif_idx, key_idx),
569 			key_data, sizeof(key_data));
570 
571 	val = mt76_rr(dev, MT_SKEY_MODE(vif_idx));
572 	val &= ~(MT_SKEY_MODE_MASK << MT_SKEY_MODE_SHIFT(vif_idx, key_idx));
573 	val |= cipher << MT_SKEY_MODE_SHIFT(vif_idx, key_idx);
574 	mt76_wr(dev, MT_SKEY_MODE(vif_idx), val);
575 
576 	return 0;
577 }
578