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, 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
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, bcn_addr, skb))
61		dev->beacon_data_count++;
62	dev_kfree_skb(skb);
63}
64EXPORT_SYMBOL_GPL(mt76x02_mac_set_beacon);
65
66void mt76x02_mac_set_beacon_enable(struct mt76x02_dev *dev,
67				   struct ieee80211_vif *vif, bool enable)
68{
69	struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
70	u8 old_mask = dev->mt76.beacon_mask;
71
72	mt76x02_pre_tbtt_enable(dev, false);
73
74	if (!dev->mt76.beacon_mask)
75		dev->tbtt_count = 0;
76
77	if (enable) {
78		dev->mt76.beacon_mask |= BIT(mvif->idx);
79	} else {
80		dev->mt76.beacon_mask &= ~BIT(mvif->idx);
81	}
82
83	if (!!old_mask == !!dev->mt76.beacon_mask)
84		goto out;
85
86	if (dev->mt76.beacon_mask)
87		mt76_set(dev, MT_BEACON_TIME_CFG,
88			 MT_BEACON_TIME_CFG_BEACON_TX |
89			 MT_BEACON_TIME_CFG_TBTT_EN |
90			 MT_BEACON_TIME_CFG_TIMER_EN);
91	else
92		mt76_clear(dev, MT_BEACON_TIME_CFG,
93			   MT_BEACON_TIME_CFG_BEACON_TX |
94			   MT_BEACON_TIME_CFG_TBTT_EN |
95			   MT_BEACON_TIME_CFG_TIMER_EN);
96	mt76x02_beacon_enable(dev, !!dev->mt76.beacon_mask);
97
98out:
99	mt76x02_pre_tbtt_enable(dev, true);
100}
101
102void
103mt76x02_resync_beacon_timer(struct mt76x02_dev *dev)
104{
105	u32 timer_val = dev->mt76.beacon_int << 4;
106
107	dev->tbtt_count++;
108
109	/*
110	 * Beacon timer drifts by 1us every tick, the timer is configured
111	 * in 1/16 TU (64us) units.
112	 */
113	if (dev->tbtt_count < 63)
114		return;
115
116	/*
117	 * The updated beacon interval takes effect after two TBTT, because
118	 * at this point the original interval has already been loaded into
119	 * the next TBTT_TIMER value
120	 */
121	if (dev->tbtt_count == 63)
122		timer_val -= 1;
123
124	mt76_rmw_field(dev, MT_BEACON_TIME_CFG,
125		       MT_BEACON_TIME_CFG_INTVAL, timer_val);
126
127	if (dev->tbtt_count >= 64)
128		dev->tbtt_count = 0;
129}
130EXPORT_SYMBOL_GPL(mt76x02_resync_beacon_timer);
131
132void
133mt76x02_update_beacon_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
134{
135	struct mt76x02_dev *dev = (struct mt76x02_dev *)priv;
136	struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
137	struct sk_buff *skb = NULL;
138
139	if (!(dev->mt76.beacon_mask & BIT(mvif->idx)))
140		return;
141
142	skb = ieee80211_beacon_get(mt76_hw(dev), vif);
143	if (!skb)
144		return;
145
146	mt76x02_mac_set_beacon(dev, skb);
147}
148EXPORT_SYMBOL_GPL(mt76x02_update_beacon_iter);
149
150static void
151mt76x02_add_buffered_bc(void *priv, u8 *mac, struct ieee80211_vif *vif)
152{
153	struct beacon_bc_data *data = priv;
154	struct mt76x02_dev *dev = data->dev;
155	struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
156	struct ieee80211_tx_info *info;
157	struct sk_buff *skb;
158
159	if (!(dev->mt76.beacon_mask & BIT(mvif->idx)))
160		return;
161
162	skb = ieee80211_get_buffered_bc(mt76_hw(dev), vif);
163	if (!skb)
164		return;
165
166	info = IEEE80211_SKB_CB(skb);
167	info->control.vif = vif;
168	info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
169	mt76_skb_set_moredata(skb, true);
170	__skb_queue_tail(&data->q, skb);
171	data->tail[mvif->idx] = skb;
172}
173
174void
175mt76x02_enqueue_buffered_bc(struct mt76x02_dev *dev,
176			    struct beacon_bc_data *data,
177			    int max_nframes)
178{
179	int i, nframes;
180
181	data->dev = dev;
182	__skb_queue_head_init(&data->q);
183
184	do {
185		nframes = skb_queue_len(&data->q);
186		ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
187			IEEE80211_IFACE_ITER_RESUME_ALL,
188			mt76x02_add_buffered_bc, data);
189	} while (nframes != skb_queue_len(&data->q) &&
190		 skb_queue_len(&data->q) < max_nframes);
191
192	if (!skb_queue_len(&data->q))
193		return;
194
195	for (i = 0; i < ARRAY_SIZE(data->tail); i++) {
196		if (!data->tail[i])
197			continue;
198		mt76_skb_set_moredata(data->tail[i], false);
199	}
200}
201EXPORT_SYMBOL_GPL(mt76x02_enqueue_buffered_bc);
202
203void mt76x02_init_beacon_config(struct mt76x02_dev *dev)
204{
205	mt76_clear(dev, MT_BEACON_TIME_CFG, (MT_BEACON_TIME_CFG_TIMER_EN |
206					     MT_BEACON_TIME_CFG_TBTT_EN |
207					     MT_BEACON_TIME_CFG_BEACON_TX));
208	mt76_set(dev, MT_BEACON_TIME_CFG, MT_BEACON_TIME_CFG_SYNC_MODE);
209	mt76_wr(dev, MT_BCN_BYPASS_MASK, 0xffff);
210	mt76x02_set_beacon_offsets(dev);
211}
212EXPORT_SYMBOL_GPL(mt76x02_init_beacon_config);
213
214