1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
4  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
5  */
6 
7 #include "mt7601u.h"
8 #include "mac.h"
9 #include <linux/etherdevice.h>
10 
11 static int mt7601u_start(struct ieee80211_hw *hw)
12 {
13 	struct mt7601u_dev *dev = hw->priv;
14 	int ret;
15 
16 	mutex_lock(&dev->mutex);
17 
18 	ret = mt7601u_mac_start(dev);
19 	if (ret)
20 		goto out;
21 
22 	ieee80211_queue_delayed_work(dev->hw, &dev->mac_work,
23 				     MT_CALIBRATE_INTERVAL);
24 	ieee80211_queue_delayed_work(dev->hw, &dev->cal_work,
25 				     MT_CALIBRATE_INTERVAL);
26 out:
27 	mutex_unlock(&dev->mutex);
28 	return ret;
29 }
30 
31 static void mt7601u_stop(struct ieee80211_hw *hw)
32 {
33 	struct mt7601u_dev *dev = hw->priv;
34 
35 	mutex_lock(&dev->mutex);
36 
37 	cancel_delayed_work_sync(&dev->cal_work);
38 	cancel_delayed_work_sync(&dev->mac_work);
39 	mt7601u_mac_stop(dev);
40 
41 	mutex_unlock(&dev->mutex);
42 }
43 
44 static int mt7601u_add_interface(struct ieee80211_hw *hw,
45 				 struct ieee80211_vif *vif)
46 {
47 	struct mt7601u_dev *dev = hw->priv;
48 	struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
49 	unsigned int idx = 0;
50 	unsigned int wcid = GROUP_WCID(idx);
51 
52 	/* Note: for AP do the AP-STA things mt76 does:
53 	 *	- beacon offsets
54 	 *	- do mac address tricks
55 	 *	- shift vif idx
56 	 */
57 	mvif->idx = idx;
58 
59 	if (!ether_addr_equal(dev->macaddr, vif->addr))
60 		mt7601u_set_macaddr(dev, vif->addr);
61 
62 	if (dev->wcid_mask[wcid / BITS_PER_LONG] & BIT(wcid % BITS_PER_LONG))
63 		return -ENOSPC;
64 	dev->wcid_mask[wcid / BITS_PER_LONG] |= BIT(wcid % BITS_PER_LONG);
65 	mvif->group_wcid.idx = wcid;
66 	mvif->group_wcid.hw_key_idx = -1;
67 
68 	return 0;
69 }
70 
71 static void mt7601u_remove_interface(struct ieee80211_hw *hw,
72 				     struct ieee80211_vif *vif)
73 {
74 	struct mt7601u_dev *dev = hw->priv;
75 	struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
76 	unsigned int wcid = mvif->group_wcid.idx;
77 
78 	dev->wcid_mask[wcid / BITS_PER_LONG] &= ~BIT(wcid % BITS_PER_LONG);
79 }
80 
81 static int mt7601u_config(struct ieee80211_hw *hw, u32 changed)
82 {
83 	struct mt7601u_dev *dev = hw->priv;
84 	int ret = 0;
85 
86 	mutex_lock(&dev->mutex);
87 
88 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
89 		ieee80211_stop_queues(hw);
90 		ret = mt7601u_phy_set_channel(dev, &hw->conf.chandef);
91 		ieee80211_wake_queues(hw);
92 	}
93 
94 	mutex_unlock(&dev->mutex);
95 
96 	return ret;
97 }
98 
99 static void
100 mt76_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags,
101 		      unsigned int *total_flags, u64 multicast)
102 {
103 	struct mt7601u_dev *dev = hw->priv;
104 	u32 flags = 0;
105 
106 #define MT76_FILTER(_flag, _hw) do { \
107 		flags |= *total_flags & FIF_##_flag;			\
108 		dev->rxfilter &= ~(_hw);				\
109 		dev->rxfilter |= !(flags & FIF_##_flag) * (_hw);	\
110 	} while (0)
111 
112 	mutex_lock(&dev->mutex);
113 
114 	dev->rxfilter &= ~MT_RX_FILTR_CFG_OTHER_BSS;
115 
116 	MT76_FILTER(OTHER_BSS, MT_RX_FILTR_CFG_PROMISC);
117 	MT76_FILTER(FCSFAIL, MT_RX_FILTR_CFG_CRC_ERR);
118 	MT76_FILTER(PLCPFAIL, MT_RX_FILTR_CFG_PHY_ERR);
119 	MT76_FILTER(CONTROL, MT_RX_FILTR_CFG_ACK |
120 			     MT_RX_FILTR_CFG_CTS |
121 			     MT_RX_FILTR_CFG_CFEND |
122 			     MT_RX_FILTR_CFG_CFACK |
123 			     MT_RX_FILTR_CFG_BA |
124 			     MT_RX_FILTR_CFG_CTRL_RSV);
125 	MT76_FILTER(PSPOLL, MT_RX_FILTR_CFG_PSPOLL);
126 
127 	*total_flags = flags;
128 	mt76_wr(dev, MT_RX_FILTR_CFG, dev->rxfilter);
129 
130 	mutex_unlock(&dev->mutex);
131 }
132 
133 static void
134 mt7601u_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
135 			 struct ieee80211_bss_conf *info, u64 changed)
136 {
137 	struct mt7601u_dev *dev = hw->priv;
138 
139 	mutex_lock(&dev->mutex);
140 
141 	if (changed & BSS_CHANGED_ASSOC)
142 		mt7601u_phy_con_cal_onoff(dev, info);
143 
144 	if (changed & BSS_CHANGED_BSSID) {
145 		mt7601u_addr_wr(dev, MT_MAC_BSSID_DW0, info->bssid);
146 
147 		/* Note: this is a hack because beacon_int is not changed
148 		 *	 on leave nor is any more appropriate event generated.
149 		 *	 rt2x00 doesn't seem to be bothered though.
150 		 */
151 		if (is_zero_ether_addr(info->bssid))
152 			mt7601u_mac_config_tsf(dev, false, 0);
153 	}
154 
155 	if (changed & BSS_CHANGED_BASIC_RATES) {
156 		mt7601u_wr(dev, MT_LEGACY_BASIC_RATE, info->basic_rates);
157 		mt7601u_wr(dev, MT_HT_FBK_CFG0, 0x65432100);
158 		mt7601u_wr(dev, MT_HT_FBK_CFG1, 0xedcba980);
159 		mt7601u_wr(dev, MT_LG_FBK_CFG0, 0xedcba988);
160 		mt7601u_wr(dev, MT_LG_FBK_CFG1, 0x00002100);
161 	}
162 
163 	if (changed & BSS_CHANGED_BEACON_INT)
164 		mt7601u_mac_config_tsf(dev, true, info->beacon_int);
165 
166 	if (changed & BSS_CHANGED_HT || changed & BSS_CHANGED_ERP_CTS_PROT)
167 		mt7601u_mac_set_protection(dev, info->use_cts_prot,
168 					   info->ht_operation_mode);
169 
170 	if (changed & BSS_CHANGED_ERP_PREAMBLE)
171 		mt7601u_mac_set_short_preamble(dev, info->use_short_preamble);
172 
173 	if (changed & BSS_CHANGED_ERP_SLOT) {
174 		int slottime = info->use_short_slot ? 9 : 20;
175 
176 		mt76_rmw_field(dev, MT_BKOFF_SLOT_CFG,
177 			       MT_BKOFF_SLOT_CFG_SLOTTIME, slottime);
178 	}
179 
180 	if (changed & BSS_CHANGED_ASSOC)
181 		mt7601u_phy_recalibrate_after_assoc(dev);
182 
183 	mutex_unlock(&dev->mutex);
184 }
185 
186 static int
187 mt76_wcid_alloc(struct mt7601u_dev *dev)
188 {
189 	int i, idx = 0;
190 
191 	for (i = 0; i < ARRAY_SIZE(dev->wcid_mask); i++) {
192 		idx = ffs(~dev->wcid_mask[i]);
193 		if (!idx)
194 			continue;
195 
196 		idx--;
197 		dev->wcid_mask[i] |= BIT(idx);
198 		break;
199 	}
200 
201 	idx = i * BITS_PER_LONG + idx;
202 	if (idx > 119)
203 		return -1;
204 
205 	return idx;
206 }
207 
208 static int
209 mt7601u_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
210 		struct ieee80211_sta *sta)
211 {
212 	struct mt7601u_dev *dev = hw->priv;
213 	struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
214 	struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
215 	int ret = 0;
216 	int idx = 0;
217 
218 	mutex_lock(&dev->mutex);
219 
220 	idx = mt76_wcid_alloc(dev);
221 	if (idx < 0) {
222 		ret = -ENOSPC;
223 		goto out;
224 	}
225 
226 	msta->wcid.idx = idx;
227 	msta->wcid.hw_key_idx = -1;
228 	mt7601u_mac_wcid_setup(dev, idx, mvif->idx, sta->addr);
229 	mt76_clear(dev, MT_WCID_DROP(idx), MT_WCID_DROP_MASK(idx));
230 	rcu_assign_pointer(dev->wcid[idx], &msta->wcid);
231 	mt7601u_mac_set_ampdu_factor(dev);
232 
233 out:
234 	mutex_unlock(&dev->mutex);
235 
236 	return ret;
237 }
238 
239 static int
240 mt7601u_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
241 		   struct ieee80211_sta *sta)
242 {
243 	struct mt7601u_dev *dev = hw->priv;
244 	struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
245 	int idx = msta->wcid.idx;
246 
247 	mutex_lock(&dev->mutex);
248 	rcu_assign_pointer(dev->wcid[idx], NULL);
249 	mt76_set(dev, MT_WCID_DROP(idx), MT_WCID_DROP_MASK(idx));
250 	dev->wcid_mask[idx / BITS_PER_LONG] &= ~BIT(idx % BITS_PER_LONG);
251 	mt7601u_mac_wcid_setup(dev, idx, 0, NULL);
252 	mt7601u_mac_set_ampdu_factor(dev);
253 	mutex_unlock(&dev->mutex);
254 
255 	return 0;
256 }
257 
258 static void
259 mt7601u_sta_notify(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
260 		   enum sta_notify_cmd cmd, struct ieee80211_sta *sta)
261 {
262 }
263 
264 static void
265 mt7601u_sw_scan(struct ieee80211_hw *hw,
266 		struct ieee80211_vif *vif,
267 		const u8 *mac_addr)
268 {
269 	struct mt7601u_dev *dev = hw->priv;
270 
271 	mt7601u_agc_save(dev);
272 	set_bit(MT7601U_STATE_SCANNING, &dev->state);
273 }
274 
275 static void
276 mt7601u_sw_scan_complete(struct ieee80211_hw *hw,
277 			 struct ieee80211_vif *vif)
278 {
279 	struct mt7601u_dev *dev = hw->priv;
280 
281 	mt7601u_agc_restore(dev);
282 	clear_bit(MT7601U_STATE_SCANNING, &dev->state);
283 
284 	ieee80211_queue_delayed_work(dev->hw, &dev->cal_work,
285 				     MT_CALIBRATE_INTERVAL);
286 	if (dev->freq_cal.enabled)
287 		ieee80211_queue_delayed_work(dev->hw, &dev->freq_cal.work,
288 					     MT_FREQ_CAL_INIT_DELAY);
289 }
290 
291 static int
292 mt7601u_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
293 		struct ieee80211_vif *vif, struct ieee80211_sta *sta,
294 		struct ieee80211_key_conf *key)
295 {
296 	struct mt7601u_dev *dev = hw->priv;
297 	struct mt76_vif *mvif = (struct mt76_vif *) vif->drv_priv;
298 	struct mt76_sta *msta = sta ? (struct mt76_sta *) sta->drv_priv : NULL;
299 	struct mt76_wcid *wcid = msta ? &msta->wcid : &mvif->group_wcid;
300 	int idx = key->keyidx;
301 	int ret;
302 
303 	/* fall back to sw encryption for unsupported ciphers */
304 	switch (key->cipher) {
305 	case WLAN_CIPHER_SUITE_WEP40:
306 	case WLAN_CIPHER_SUITE_WEP104:
307 	case WLAN_CIPHER_SUITE_TKIP:
308 	case WLAN_CIPHER_SUITE_CCMP:
309 		break;
310 	default:
311 		return -EOPNOTSUPP;
312 	}
313 
314 	if (cmd == SET_KEY) {
315 		key->hw_key_idx = wcid->idx;
316 		wcid->hw_key_idx = idx;
317 	} else {
318 		if (idx == wcid->hw_key_idx)
319 			wcid->hw_key_idx = -1;
320 
321 		key = NULL;
322 	}
323 
324 	if (!msta) {
325 		if (key || wcid->hw_key_idx == idx) {
326 			ret = mt76_mac_wcid_set_key(dev, wcid->idx, key);
327 			if (ret)
328 				return ret;
329 		}
330 
331 		return mt76_mac_shared_key_setup(dev, mvif->idx, idx, key);
332 	}
333 
334 	return mt76_mac_wcid_set_key(dev, msta->wcid.idx, key);
335 }
336 
337 static int mt7601u_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
338 {
339 	struct mt7601u_dev *dev = hw->priv;
340 
341 	mt76_rmw_field(dev, MT_TX_RTS_CFG, MT_TX_RTS_CFG_THRESH, value);
342 
343 	return 0;
344 }
345 
346 static int
347 mt76_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
348 		  struct ieee80211_ampdu_params *params)
349 {
350 	struct mt7601u_dev *dev = hw->priv;
351 	struct ieee80211_sta *sta = params->sta;
352 	enum ieee80211_ampdu_mlme_action action = params->action;
353 	u16 tid = params->tid;
354 	u16 ssn = params->ssn;
355 	struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
356 
357 	WARN_ON(msta->wcid.idx > GROUP_WCID(0));
358 
359 	switch (action) {
360 	case IEEE80211_AMPDU_RX_START:
361 		mt76_set(dev, MT_WCID_ADDR(msta->wcid.idx) + 4, BIT(16 + tid));
362 		break;
363 	case IEEE80211_AMPDU_RX_STOP:
364 		mt76_clear(dev, MT_WCID_ADDR(msta->wcid.idx) + 4,
365 			   BIT(16 + tid));
366 		break;
367 	case IEEE80211_AMPDU_TX_OPERATIONAL:
368 		ieee80211_send_bar(vif, sta->addr, tid, msta->agg_ssn[tid]);
369 		break;
370 	case IEEE80211_AMPDU_TX_STOP_FLUSH:
371 	case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
372 		break;
373 	case IEEE80211_AMPDU_TX_START:
374 		msta->agg_ssn[tid] = ssn << 4;
375 		return IEEE80211_AMPDU_TX_START_IMMEDIATE;
376 	case IEEE80211_AMPDU_TX_STOP_CONT:
377 		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
378 		break;
379 	}
380 
381 	return 0;
382 }
383 
384 static void
385 mt76_sta_rate_tbl_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
386 			 struct ieee80211_sta *sta)
387 {
388 	struct mt7601u_dev *dev = hw->priv;
389 	struct mt76_sta *msta = (struct mt76_sta *) sta->drv_priv;
390 	struct ieee80211_sta_rates *rates;
391 	struct ieee80211_tx_rate rate = {};
392 
393 	rcu_read_lock();
394 	rates = rcu_dereference(sta->rates);
395 
396 	if (!rates)
397 		goto out;
398 
399 	rate.idx = rates->rate[0].idx;
400 	rate.flags = rates->rate[0].flags;
401 	mt76_mac_wcid_set_rate(dev, &msta->wcid, &rate);
402 
403 out:
404 	rcu_read_unlock();
405 }
406 
407 const struct ieee80211_ops mt7601u_ops = {
408 	.tx = mt7601u_tx,
409 	.wake_tx_queue = ieee80211_handle_wake_tx_queue,
410 	.start = mt7601u_start,
411 	.stop = mt7601u_stop,
412 	.add_interface = mt7601u_add_interface,
413 	.remove_interface = mt7601u_remove_interface,
414 	.config = mt7601u_config,
415 	.configure_filter = mt76_configure_filter,
416 	.bss_info_changed = mt7601u_bss_info_changed,
417 	.sta_add = mt7601u_sta_add,
418 	.sta_remove = mt7601u_sta_remove,
419 	.sta_notify = mt7601u_sta_notify,
420 	.set_key = mt7601u_set_key,
421 	.conf_tx = mt7601u_conf_tx,
422 	.sw_scan_start = mt7601u_sw_scan,
423 	.sw_scan_complete = mt7601u_sw_scan_complete,
424 	.ampdu_action = mt76_ampdu_action,
425 	.sta_rate_tbl_update = mt76_sta_rate_tbl_update,
426 	.set_rts_threshold = mt7601u_set_rts_threshold,
427 };
428