drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c

   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
  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
  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
  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                 dev->beacon_data_count++;
  62         dev_kfree_skb(skb);
  63 }
  64 EXPORT_SYMBOL_GPL(mt76x02_mac_set_beacon);
  65
  66 void 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
  98 out:
  99         mt76x02_pre_tbtt_enable(dev, true);
 100 }
 101
 102 void
 103 mt76x02_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 }
 130 EXPORT_SYMBOL_GPL(mt76x02_resync_beacon_timer);
 131
 132 void
 133 mt76x02_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 }
 148 EXPORT_SYMBOL_GPL(mt76x02_update_beacon_iter);
 149
 150 static void
 151 mt76x02_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
 174 void
 175 mt76x02_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 }
 201 EXPORT_SYMBOL_GPL(mt76x02_enqueue_buffered_bc);
 202
 203 void 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 }
 212 EXPORT_SYMBOL_GPL(mt76x02_init_beacon_config);
 213