1 // SPDX-License-Identifier: ISC
2 /*
3  * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
4  * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
5  * Copyright (C) 2018 Stanislaw Gruszka <stf_xl@wp.pl>
6  */
7 
8 #include "mt76x02.h"
9 
mt76x02_set_beacon_offsets(struct mt76x02_dev * dev)10 static void mt76x02_set_beacon_offsets(struct mt76x02_dev *dev)
11 {
12 	u32 regs[4] = {};
13 	u16 val;
14 	int i;
15 
16 	for (i = 0; i < dev->beacon_ops->nslots; i++) {
17 		val = i * dev->beacon_ops->slot_size;
18 		regs[i / 4] |= (val / 64) << (8 * (i % 4));
19 	}
20 
21 	for (i = 0; i < 4; i++)
22 		mt76_wr(dev, MT_BCN_OFFSET(i), regs[i]);
23 }
24 
25 static int
mt76x02_write_beacon(struct mt76x02_dev * dev,int offset,struct sk_buff * skb)26 mt76x02_write_beacon(struct mt76x02_dev *dev, int offset, struct sk_buff *skb)
27 {
28 	int beacon_len = dev->beacon_ops->slot_size;
29 
30 	if (WARN_ON_ONCE(beacon_len < skb->len + sizeof(struct mt76x02_txwi)))
31 		return -ENOSPC;
32 
33 	/* USB devices already reserve enough skb headroom for txwi's. This
34 	 * helps to save slow copies over USB.
35 	 */
36 	if (mt76_is_usb(&dev->mt76)) {
37 		struct mt76x02_txwi *txwi;
38 
39 		txwi = (struct mt76x02_txwi *)(skb->data - sizeof(*txwi));
40 		mt76x02_mac_write_txwi(dev, txwi, skb, NULL, NULL, skb->len);
41 		skb_push(skb, sizeof(*txwi));
42 	} else {
43 		struct mt76x02_txwi txwi;
44 
45 		mt76x02_mac_write_txwi(dev, &txwi, skb, NULL, NULL, skb->len);
46 		mt76_wr_copy(dev, offset, &txwi, sizeof(txwi));
47 		offset += sizeof(txwi);
48 	}
49 
50 	mt76_wr_copy(dev, offset, skb->data, skb->len);
51 	return 0;
52 }
53 
mt76x02_mac_set_beacon(struct mt76x02_dev * dev,struct sk_buff * skb)54 void mt76x02_mac_set_beacon(struct mt76x02_dev *dev,
55 			    struct sk_buff *skb)
56 {
57 	int bcn_len = dev->beacon_ops->slot_size;
58 	int bcn_addr = MT_BEACON_BASE + (bcn_len * dev->beacon_data_count);
59 
60 	if (!mt76x02_write_beacon(dev, bcn_addr, skb)) {
61 		if (!dev->beacon_data_count)
62 			dev->beacon_hang_check++;
63 		dev->beacon_data_count++;
64 	}
65 	dev_kfree_skb(skb);
66 }
67 EXPORT_SYMBOL_GPL(mt76x02_mac_set_beacon);
68 
mt76x02_mac_set_beacon_enable(struct mt76x02_dev * dev,struct ieee80211_vif * vif,bool enable)69 void mt76x02_mac_set_beacon_enable(struct mt76x02_dev *dev,
70 				   struct ieee80211_vif *vif, bool enable)
71 {
72 	struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
73 	u8 old_mask = dev->mt76.beacon_mask;
74 
75 	mt76x02_pre_tbtt_enable(dev, false);
76 
77 	if (!dev->mt76.beacon_mask)
78 		dev->tbtt_count = 0;
79 
80 	dev->beacon_hang_check = 0;
81 	if (enable) {
82 		dev->mt76.beacon_mask |= BIT(mvif->idx);
83 	} else {
84 		dev->mt76.beacon_mask &= ~BIT(mvif->idx);
85 	}
86 
87 	if (!!old_mask == !!dev->mt76.beacon_mask)
88 		goto out;
89 
90 	if (dev->mt76.beacon_mask)
91 		mt76_set(dev, MT_BEACON_TIME_CFG,
92 			 MT_BEACON_TIME_CFG_BEACON_TX |
93 			 MT_BEACON_TIME_CFG_TBTT_EN |
94 			 MT_BEACON_TIME_CFG_TIMER_EN);
95 	else
96 		mt76_clear(dev, MT_BEACON_TIME_CFG,
97 			   MT_BEACON_TIME_CFG_BEACON_TX |
98 			   MT_BEACON_TIME_CFG_TBTT_EN |
99 			   MT_BEACON_TIME_CFG_TIMER_EN);
100 	mt76x02_beacon_enable(dev, !!dev->mt76.beacon_mask);
101 
102 out:
103 	mt76x02_pre_tbtt_enable(dev, true);
104 }
105 
106 void
mt76x02_resync_beacon_timer(struct mt76x02_dev * dev)107 mt76x02_resync_beacon_timer(struct mt76x02_dev *dev)
108 {
109 	u32 timer_val = dev->mt76.beacon_int << 4;
110 
111 	dev->tbtt_count++;
112 
113 	/*
114 	 * Beacon timer drifts by 1us every tick, the timer is configured
115 	 * in 1/16 TU (64us) units.
116 	 */
117 	if (dev->tbtt_count < 63)
118 		return;
119 
120 	/*
121 	 * The updated beacon interval takes effect after two TBTT, because
122 	 * at this point the original interval has already been loaded into
123 	 * the next TBTT_TIMER value
124 	 */
125 	if (dev->tbtt_count == 63)
126 		timer_val -= 1;
127 
128 	mt76_rmw_field(dev, MT_BEACON_TIME_CFG,
129 		       MT_BEACON_TIME_CFG_INTVAL, timer_val);
130 
131 	if (dev->tbtt_count >= 64)
132 		dev->tbtt_count = 0;
133 }
134 EXPORT_SYMBOL_GPL(mt76x02_resync_beacon_timer);
135 
136 void
mt76x02_update_beacon_iter(void * priv,u8 * mac,struct ieee80211_vif * vif)137 mt76x02_update_beacon_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
138 {
139 	struct mt76x02_dev *dev = (struct mt76x02_dev *)priv;
140 	struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
141 	struct sk_buff *skb = NULL;
142 
143 	if (!(dev->mt76.beacon_mask & BIT(mvif->idx)))
144 		return;
145 
146 	skb = ieee80211_beacon_get(mt76_hw(dev), vif, 0);
147 	if (!skb)
148 		return;
149 
150 	mt76x02_mac_set_beacon(dev, skb);
151 }
152 EXPORT_SYMBOL_GPL(mt76x02_update_beacon_iter);
153 
154 static void
mt76x02_add_buffered_bc(void * priv,u8 * mac,struct ieee80211_vif * vif)155 mt76x02_add_buffered_bc(void *priv, u8 *mac, struct ieee80211_vif *vif)
156 {
157 	struct beacon_bc_data *data = priv;
158 	struct mt76x02_dev *dev = data->dev;
159 	struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
160 	struct ieee80211_tx_info *info;
161 	struct sk_buff *skb;
162 
163 	if (!(dev->mt76.beacon_mask & BIT(mvif->idx)))
164 		return;
165 
166 	skb = ieee80211_get_buffered_bc(mt76_hw(dev), vif);
167 	if (!skb)
168 		return;
169 
170 	info = IEEE80211_SKB_CB(skb);
171 	info->control.vif = vif;
172 	info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
173 	mt76_skb_set_moredata(skb, true);
174 	__skb_queue_tail(&data->q, skb);
175 	data->tail[mvif->idx] = skb;
176 }
177 
178 void
mt76x02_enqueue_buffered_bc(struct mt76x02_dev * dev,struct beacon_bc_data * data,int max_nframes)179 mt76x02_enqueue_buffered_bc(struct mt76x02_dev *dev,
180 			    struct beacon_bc_data *data,
181 			    int max_nframes)
182 {
183 	int i, nframes;
184 
185 	data->dev = dev;
186 	__skb_queue_head_init(&data->q);
187 
188 	do {
189 		nframes = skb_queue_len(&data->q);
190 		ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
191 			IEEE80211_IFACE_ITER_RESUME_ALL,
192 			mt76x02_add_buffered_bc, data);
193 	} while (nframes != skb_queue_len(&data->q) &&
194 		 skb_queue_len(&data->q) < max_nframes);
195 
196 	if (!skb_queue_len(&data->q))
197 		return;
198 
199 	for (i = 0; i < ARRAY_SIZE(data->tail); i++) {
200 		if (!data->tail[i])
201 			continue;
202 		mt76_skb_set_moredata(data->tail[i], false);
203 	}
204 }
205 EXPORT_SYMBOL_GPL(mt76x02_enqueue_buffered_bc);
206 
mt76x02_init_beacon_config(struct mt76x02_dev * dev)207 void mt76x02_init_beacon_config(struct mt76x02_dev *dev)
208 {
209 	mt76_clear(dev, MT_BEACON_TIME_CFG, (MT_BEACON_TIME_CFG_TIMER_EN |
210 					     MT_BEACON_TIME_CFG_TBTT_EN |
211 					     MT_BEACON_TIME_CFG_BEACON_TX));
212 	mt76_set(dev, MT_BEACON_TIME_CFG, MT_BEACON_TIME_CFG_SYNC_MODE);
213 	mt76_wr(dev, MT_BCN_BYPASS_MASK, 0xffff);
214 	mt76x02_set_beacon_offsets(dev);
215 }
216 EXPORT_SYMBOL_GPL(mt76x02_init_beacon_config);
217 
218