1 // SPDX-License-Identifier: ISC
3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
6 #include "mt76x02_usb.h"
8 static void mt76x02u_remove_dma_hdr(struct sk_buff *skb)
12 skb_pull(skb, sizeof(struct mt76x02_txwi) + MT_DMA_HDR_LEN);
13 hdr_len = ieee80211_get_hdrlen_from_skb(skb);
15 mt76x02_remove_hdr_pad(skb, 2);
18 void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, enum mt76_txq_id qid,
19 struct mt76_queue_entry *e)
21 mt76x02u_remove_dma_hdr(e->skb);
22 mt76_tx_complete_skb(mdev, e->skb);
24 EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb);
26 int mt76x02u_mac_start(struct mt76x02_dev *dev)
28 mt76x02_mac_reset_counters(dev);
30 mt76_wr(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_ENABLE_TX);
31 if (!mt76x02_wait_for_wpdma(&dev->mt76, 200000))
34 mt76_wr(dev, MT_RX_FILTR_CFG, dev->mt76.rxfilter);
36 mt76_wr(dev, MT_MAC_SYS_CTRL,
37 MT_MAC_SYS_CTRL_ENABLE_TX |
38 MT_MAC_SYS_CTRL_ENABLE_RX);
40 if (!mt76x02_wait_for_wpdma(&dev->mt76, 50))
45 EXPORT_SYMBOL_GPL(mt76x02u_mac_start);
47 int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags)
49 struct sk_buff *iter, *last = skb;
53 * | 4B | xfer len | pad | 4B |
54 * | TXINFO | pkt/cmd | zero pad to 4B | zero |
56 * length field of TXINFO should be set to 'xfer len'.
58 info = FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
59 FIELD_PREP(MT_TXD_INFO_DPORT, port) | flags;
60 put_unaligned_le32(info, skb_push(skb, sizeof(info)));
62 /* Add zero pad of 4 - 7 bytes */
63 pad = round_up(skb->len, 4) + 4 - skb->len;
65 /* First packet of a A-MSDU burst keeps track of the whole burst
66 * length, need to update length of it and the last packet.
68 skb_walk_frags(skb, iter) {
77 if (skb_pad(last, pad))
84 int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
85 enum mt76_txq_id qid, struct mt76_wcid *wcid,
86 struct ieee80211_sta *sta,
87 struct mt76_tx_info *tx_info)
89 struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76);
90 int pid, len = tx_info->skb->len, ep = q2ep(mdev->q_tx[qid].q->hw_idx);
91 struct mt76x02_txwi *txwi;
92 bool ampdu = IEEE80211_SKB_CB(tx_info->skb)->flags & IEEE80211_TX_CTL_AMPDU;
96 mt76_insert_hdr_pad(tx_info->skb);
98 txwi = (struct mt76x02_txwi *)(tx_info->skb->data - sizeof(*txwi));
99 mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len);
100 skb_push(tx_info->skb, sizeof(*txwi));
102 pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
104 /* encode packet rate for no-skb packet id to fix up status reporting */
105 if (pid == MT_PACKET_ID_NO_SKB)
106 pid = MT_PACKET_ID_HAS_RATE |
107 (le16_to_cpu(txwi->rate) & MT_PKTID_RATE) |
108 FIELD_PREP(MT_PKTID_AC,
109 skb_get_queue_mapping(tx_info->skb));
113 if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA)
118 flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
120 if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv)
121 flags |= MT_TXD_INFO_WIV;
124 struct mt76x02_sta *msta = (struct mt76x02_sta *)sta->drv_priv;
126 ewma_pktlen_add(&msta->pktlen, tx_info->skb->len);
129 return mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags);
131 EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb);
133 /* Trigger pre-TBTT event 8 ms before TBTT */
134 #define PRE_TBTT_USEC 8000
136 /* Beacon SRAM memory is limited to 8kB. We need to send PS buffered frames
137 * (which can be 1500 bytes big) via beacon memory. That make limit of number
138 * of slots to 5. TODO: dynamically calculate offsets in beacon SRAM.
140 #define N_BCN_SLOTS 5
142 static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev)
147 /* Get remaining TBTT in usec */
148 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
151 if (tbtt <= PRE_TBTT_USEC) {
152 queue_work(system_highpri_wq, &dev->pre_tbtt_work);
156 time = (tbtt - PRE_TBTT_USEC) * 1000ull;
157 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
160 static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev)
165 /* Get remaining TBTT in usec */
166 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
169 dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0);
170 dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1);
171 tsf = (u64)dw0 << 32 | dw1;
172 dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt);
174 /* Convert beacon interval in TU (1024 usec) to nsec */
175 time = ((1000000000ull * dev->mt76.beacon_int) >> 10);
177 /* Adjust time to trigger hrtimer 8ms before TBTT */
178 if (tbtt < PRE_TBTT_USEC)
179 time -= (PRE_TBTT_USEC - tbtt) * 1000ull;
181 time += (tbtt - PRE_TBTT_USEC) * 1000ull;
183 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
186 static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev)
189 hrtimer_cancel(&dev->pre_tbtt_timer);
190 cancel_work_sync(&dev->pre_tbtt_work);
191 /* Timer can be rearmed by work. */
192 } while (hrtimer_active(&dev->pre_tbtt_timer));
195 static void mt76x02u_pre_tbtt_work(struct work_struct *work)
197 struct mt76x02_dev *dev =
198 container_of(work, struct mt76x02_dev, pre_tbtt_work);
199 struct beacon_bc_data data = {};
203 if (!dev->mt76.beacon_mask)
206 if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL)
209 mt76x02_resync_beacon_timer(dev);
211 ieee80211_iterate_active_interfaces(mt76_hw(dev),
212 IEEE80211_IFACE_ITER_RESUME_ALL,
213 mt76x02_update_beacon_iter, dev);
215 nbeacons = hweight8(dev->mt76.beacon_mask);
216 mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons);
218 for (i = nbeacons; i < N_BCN_SLOTS; i++) {
219 skb = __skb_dequeue(&data.q);
220 mt76x02_mac_set_beacon(dev, i, skb);
223 mt76x02u_restart_pre_tbtt_timer(dev);
226 static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer)
228 struct mt76x02_dev *dev =
229 container_of(timer, struct mt76x02_dev, pre_tbtt_timer);
231 queue_work(system_highpri_wq, &dev->pre_tbtt_work);
233 return HRTIMER_NORESTART;
236 static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en)
238 if (en && dev->mt76.beacon_mask &&
239 !hrtimer_active(&dev->pre_tbtt_timer))
240 mt76x02u_start_pre_tbtt_timer(dev);
242 mt76x02u_stop_pre_tbtt_timer(dev);
245 static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en)
249 if (WARN_ON_ONCE(!dev->mt76.beacon_int))
253 mt76x02u_start_pre_tbtt_timer(dev);
255 /* Timer is already stopped, only clean up
256 * PS buffered frames if any.
258 for (i = 0; i < N_BCN_SLOTS; i++)
259 mt76x02_mac_set_beacon(dev, i, NULL);
263 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev)
265 static const struct mt76x02_beacon_ops beacon_ops = {
266 .nslots = N_BCN_SLOTS,
267 .slot_size = (8192 / N_BCN_SLOTS) & ~63,
268 .pre_tbtt_enable = mt76x02u_pre_tbtt_enable,
269 .beacon_enable = mt76x02u_beacon_enable,
271 dev->beacon_ops = &beacon_ops;
273 hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
274 dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt;
275 INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work);
277 mt76x02_init_beacon_config(dev);
279 EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config);
281 void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev)
283 if (!test_bit(MT76_REMOVED, &dev->mt76.state))
284 mt76_clear(dev, MT_BEACON_TIME_CFG,
285 MT_BEACON_TIME_CFG_TIMER_EN |
286 MT_BEACON_TIME_CFG_SYNC_MODE |
287 MT_BEACON_TIME_CFG_TBTT_EN |
288 MT_BEACON_TIME_CFG_BEACON_TX);
290 mt76x02u_stop_pre_tbtt_timer(dev);
292 EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config);