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