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
11static 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);
26out:
27	mutex_unlock(&dev->mutex);
28	return ret;
29}
30
31static 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
44static 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
71static 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
81static 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
99static void
100mt76_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
133static void
134mt7601u_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
186static int
187mt76_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
208static int
209mt7601u_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
233out:
234	mutex_unlock(&dev->mutex);
235
236	return ret;
237}
238
239static int
240mt7601u_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
258static void
259mt7601u_sta_notify(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
260		   enum sta_notify_cmd cmd, struct ieee80211_sta *sta)
261{
262}
263
264static void
265mt7601u_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
275static void
276mt7601u_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
291static int
292mt7601u_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
337static 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
346static int
347mt76_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
384static void
385mt76_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
403out:
404	rcu_read_unlock();
405}
406
407const struct ieee80211_ops mt7601u_ops = {
408	.add_chanctx = ieee80211_emulate_add_chanctx,
409	.remove_chanctx = ieee80211_emulate_remove_chanctx,
410	.change_chanctx = ieee80211_emulate_change_chanctx,
411	.switch_vif_chanctx = ieee80211_emulate_switch_vif_chanctx,
412	.tx = mt7601u_tx,
413	.wake_tx_queue = ieee80211_handle_wake_tx_queue,
414	.start = mt7601u_start,
415	.stop = mt7601u_stop,
416	.add_interface = mt7601u_add_interface,
417	.remove_interface = mt7601u_remove_interface,
418	.config = mt7601u_config,
419	.configure_filter = mt76_configure_filter,
420	.bss_info_changed = mt7601u_bss_info_changed,
421	.sta_add = mt7601u_sta_add,
422	.sta_remove = mt7601u_sta_remove,
423	.sta_notify = mt7601u_sta_notify,
424	.set_key = mt7601u_set_key,
425	.conf_tx = mt7601u_conf_tx,
426	.sw_scan_start = mt7601u_sw_scan,
427	.sw_scan_complete = mt7601u_sw_scan_complete,
428	.ampdu_action = mt76_ampdu_action,
429	.sta_rate_tbl_update = mt76_sta_rate_tbl_update,
430	.set_rts_threshold = mt7601u_set_rts_threshold,
431};
432