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
10static 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
25static int
26mt76x02_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, len: skb->len);
41 skb_push(skb, len: sizeof(*txwi));
42 } else {
43 struct mt76x02_txwi txwi;
44
45 mt76x02_mac_write_txwi(dev, txwi: &txwi, skb, NULL, NULL, len: 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
54void 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, offset: 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}
67EXPORT_SYMBOL_GPL(mt76x02_mac_set_beacon);
68
69void 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
102out:
103 mt76x02_pre_tbtt_enable(dev, true);
104}
105
106void
107mt76x02_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}
134EXPORT_SYMBOL_GPL(mt76x02_resync_beacon_timer);
135
136void
137mt76x02_update_beacon_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
138{
139 struct beacon_bc_data *data = priv;
140 struct mt76x02_dev *dev = data->dev;
141 struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
142 struct sk_buff *skb = NULL;
143
144 if (!(dev->mt76.beacon_mask & BIT(mvif->idx)))
145 return;
146
147 skb = ieee80211_beacon_get(mt76_hw(dev), vif, link_id: 0);
148 if (!skb)
149 return;
150
151 __skb_queue_tail(list: &data->q, newsk: skb);
152}
153EXPORT_SYMBOL_GPL(mt76x02_update_beacon_iter);
154
155static void
156mt76x02_add_buffered_bc(void *priv, u8 *mac, struct ieee80211_vif *vif)
157{
158 struct beacon_bc_data *data = priv;
159 struct mt76x02_dev *dev = data->dev;
160 struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
161 struct ieee80211_tx_info *info;
162 struct sk_buff *skb;
163
164 if (!(dev->mt76.beacon_mask & BIT(mvif->idx)))
165 return;
166
167 skb = ieee80211_get_buffered_bc(mt76_hw(dev), vif);
168 if (!skb)
169 return;
170
171 info = IEEE80211_SKB_CB(skb);
172 info->control.vif = vif;
173 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
174 mt76_skb_set_moredata(skb, enable: true);
175 __skb_queue_tail(list: &data->q, newsk: skb);
176 data->tail[mvif->idx] = skb;
177}
178
179void
180mt76x02_enqueue_buffered_bc(struct mt76x02_dev *dev,
181 struct beacon_bc_data *data,
182 int max_nframes)
183{
184 int i, nframes;
185
186 do {
187 nframes = skb_queue_len(list_: &data->q);
188 ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
189 iter_flags: IEEE80211_IFACE_ITER_RESUME_ALL,
190 iterator: mt76x02_add_buffered_bc, data);
191 } while (nframes != skb_queue_len(list_: &data->q) &&
192 skb_queue_len(list_: &data->q) < max_nframes);
193
194 if (!skb_queue_len(list_: &data->q))
195 return;
196
197 for (i = 0; i < ARRAY_SIZE(data->tail); i++) {
198 if (!data->tail[i])
199 continue;
200 mt76_skb_set_moredata(skb: data->tail[i], enable: false);
201 }
202}
203EXPORT_SYMBOL_GPL(mt76x02_enqueue_buffered_bc);
204
205void mt76x02_init_beacon_config(struct mt76x02_dev *dev)
206{
207 mt76_clear(dev, MT_BEACON_TIME_CFG, (MT_BEACON_TIME_CFG_TIMER_EN |
208 MT_BEACON_TIME_CFG_TBTT_EN |
209 MT_BEACON_TIME_CFG_BEACON_TX));
210 mt76_set(dev, MT_BEACON_TIME_CFG, MT_BEACON_TIME_CFG_SYNC_MODE);
211 mt76_wr(dev, MT_BCN_BYPASS_MASK, 0xffff);
212 mt76x02_set_beacon_offsets(dev);
213}
214EXPORT_SYMBOL_GPL(mt76x02_init_beacon_config);
215
216

source code of linux/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c