mediatek/mt76/mt76x02_beacon.c

0001 // SPDX-License-Identifier: ISC
0002 /*
0003  * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
0004  * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
0005  * Copyright (C) 2018 Stanislaw Gruszka <stf_xl@wp.pl>
0006  */
0007
0008 #include "mt76x02.h"
0009
0010 static void mt76x02_set_beacon_offsets(struct mt76x02_dev *dev)
0011 {
0012     u32 regs[4] = {};
0013     u16 val;
0014     int i;
0015
0016     for (i = 0; i < dev->beacon_ops->nslots; i++) {
0017         val = i * dev->beacon_ops->slot_size;
0018         regs[i / 4] |= (val / 64) << (8 * (i % 4));
0019     }
0020
0021     for (i = 0; i < 4; i++)
0022         mt76_wr(dev, MT_BCN_OFFSET(i), regs[i]);
0023 }
0024
0025 static int
0026 mt76x02_write_beacon(struct mt76x02_dev *dev, int offset, struct sk_buff *skb)
0027 {
0028     int beacon_len = dev->beacon_ops->slot_size;
0029
0030     if (WARN_ON_ONCE(beacon_len < skb->len + sizeof(struct mt76x02_txwi)))
0031         return -ENOSPC;
0032
0033     /* USB devices already reserve enough skb headroom for txwi's. This
0034      * helps to save slow copies over USB.
0035      */
0036     if (mt76_is_usb(&dev->mt76)) {
0037         struct mt76x02_txwi *txwi;
0038
0039         txwi = (struct mt76x02_txwi *)(skb->data - sizeof(*txwi));
0040         mt76x02_mac_write_txwi(dev, txwi, skb, NULL, NULL, skb->len);
0041         skb_push(skb, sizeof(*txwi));
0042     } else {
0043         struct mt76x02_txwi txwi;
0044
0045         mt76x02_mac_write_txwi(dev, &txwi, skb, NULL, NULL, skb->len);
0046         mt76_wr_copy(dev, offset, &txwi, sizeof(txwi));
0047         offset += sizeof(txwi);
0048     }
0049
0050     mt76_wr_copy(dev, offset, skb->data, skb->len);
0051     return 0;
0052 }
0053
0054 void mt76x02_mac_set_beacon(struct mt76x02_dev *dev,
0055                 struct sk_buff *skb)
0056 {
0057     int bcn_len = dev->beacon_ops->slot_size;
0058     int bcn_addr = MT_BEACON_BASE + (bcn_len * dev->beacon_data_count);
0059
0060     if (!mt76x02_write_beacon(dev, bcn_addr, skb)) {
0061         if (!dev->beacon_data_count)
0062             dev->beacon_hang_check++;
0063         dev->beacon_data_count++;
0064     }
0065     dev_kfree_skb(skb);
0066 }
0067 EXPORT_SYMBOL_GPL(mt76x02_mac_set_beacon);
0068
0069 void mt76x02_mac_set_beacon_enable(struct mt76x02_dev *dev,
0070                    struct ieee80211_vif *vif, bool enable)
0071 {
0072     struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
0073     u8 old_mask = dev->mt76.beacon_mask;
0074
0075     mt76x02_pre_tbtt_enable(dev, false);
0076
0077     if (!dev->mt76.beacon_mask)
0078         dev->tbtt_count = 0;
0079
0080     dev->beacon_hang_check = 0;
0081     if (enable) {
0082         dev->mt76.beacon_mask |= BIT(mvif->idx);
0083     } else {
0084         dev->mt76.beacon_mask &= ~BIT(mvif->idx);
0085     }
0086
0087     if (!!old_mask == !!dev->mt76.beacon_mask)
0088         goto out;
0089
0090     if (dev->mt76.beacon_mask)
0091         mt76_set(dev, MT_BEACON_TIME_CFG,
0092              MT_BEACON_TIME_CFG_BEACON_TX |
0093              MT_BEACON_TIME_CFG_TBTT_EN |
0094              MT_BEACON_TIME_CFG_TIMER_EN);
0095     else
0096         mt76_clear(dev, MT_BEACON_TIME_CFG,
0097                MT_BEACON_TIME_CFG_BEACON_TX |
0098                MT_BEACON_TIME_CFG_TBTT_EN |
0099                MT_BEACON_TIME_CFG_TIMER_EN);
0100     mt76x02_beacon_enable(dev, !!dev->mt76.beacon_mask);
0101
0102 out:
0103     mt76x02_pre_tbtt_enable(dev, true);
0104 }
0105
0106 void
0107 mt76x02_resync_beacon_timer(struct mt76x02_dev *dev)
0108 {
0109     u32 timer_val = dev->mt76.beacon_int << 4;
0110
0111     dev->tbtt_count++;
0112
0113     /*
0114      * Beacon timer drifts by 1us every tick, the timer is configured
0115      * in 1/16 TU (64us) units.
0116      */
0117     if (dev->tbtt_count < 63)
0118         return;
0119
0120     /*
0121      * The updated beacon interval takes effect after two TBTT, because
0122      * at this point the original interval has already been loaded into
0123      * the next TBTT_TIMER value
0124      */
0125     if (dev->tbtt_count == 63)
0126         timer_val -= 1;
0127
0128     mt76_rmw_field(dev, MT_BEACON_TIME_CFG,
0129                MT_BEACON_TIME_CFG_INTVAL, timer_val);
0130
0131     if (dev->tbtt_count >= 64)
0132         dev->tbtt_count = 0;
0133 }
0134 EXPORT_SYMBOL_GPL(mt76x02_resync_beacon_timer);
0135
0136 void
0137 mt76x02_update_beacon_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
0138 {
0139     struct mt76x02_dev *dev = (struct mt76x02_dev *)priv;
0140     struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
0141     struct sk_buff *skb = NULL;
0142
0143     if (!(dev->mt76.beacon_mask & BIT(mvif->idx)))
0144         return;
0145
0146     skb = ieee80211_beacon_get(mt76_hw(dev), vif, 0);
0147     if (!skb)
0148         return;
0149
0150     mt76x02_mac_set_beacon(dev, skb);
0151 }
0152 EXPORT_SYMBOL_GPL(mt76x02_update_beacon_iter);
0153
0154 static void
0155 mt76x02_add_buffered_bc(void *priv, u8 *mac, struct ieee80211_vif *vif)
0156 {
0157     struct beacon_bc_data *data = priv;
0158     struct mt76x02_dev *dev = data->dev;
0159     struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
0160     struct ieee80211_tx_info *info;
0161     struct sk_buff *skb;
0162
0163     if (!(dev->mt76.beacon_mask & BIT(mvif->idx)))
0164         return;
0165
0166     skb = ieee80211_get_buffered_bc(mt76_hw(dev), vif);
0167     if (!skb)
0168         return;
0169
0170     info = IEEE80211_SKB_CB(skb);
0171     info->control.vif = vif;
0172     info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
0173     mt76_skb_set_moredata(skb, true);
0174     __skb_queue_tail(&data->q, skb);
0175     data->tail[mvif->idx] = skb;
0176 }
0177
0178 void
0179 mt76x02_enqueue_buffered_bc(struct mt76x02_dev *dev,
0180                 struct beacon_bc_data *data,
0181                 int max_nframes)
0182 {
0183     int i, nframes;
0184
0185     data->dev = dev;
0186     __skb_queue_head_init(&data->q);
0187
0188     do {
0189         nframes = skb_queue_len(&data->q);
0190         ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
0191             IEEE80211_IFACE_ITER_RESUME_ALL,
0192             mt76x02_add_buffered_bc, data);
0193     } while (nframes != skb_queue_len(&data->q) &&
0194          skb_queue_len(&data->q) < max_nframes);
0195
0196     if (!skb_queue_len(&data->q))
0197         return;
0198
0199     for (i = 0; i < ARRAY_SIZE(data->tail); i++) {
0200         if (!data->tail[i])
0201             continue;
0202         mt76_skb_set_moredata(data->tail[i], false);
0203     }
0204 }
0205 EXPORT_SYMBOL_GPL(mt76x02_enqueue_buffered_bc);
0206
0207 void mt76x02_init_beacon_config(struct mt76x02_dev *dev)
0208 {
0209     mt76_clear(dev, MT_BEACON_TIME_CFG, (MT_BEACON_TIME_CFG_TIMER_EN |
0210                          MT_BEACON_TIME_CFG_TBTT_EN |
0211                          MT_BEACON_TIME_CFG_BEACON_TX));
0212     mt76_set(dev, MT_BEACON_TIME_CFG, MT_BEACON_TIME_CFG_SYNC_MODE);
0213     mt76_wr(dev, MT_BCN_BYPASS_MASK, 0xffff);
0214     mt76x02_set_beacon_offsets(dev);
0215 }
0216 EXPORT_SYMBOL_GPL(mt76x02_init_beacon_config);
0217