2 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 #include "mt76x02_usb.h"
19 static void mt76x02u_remove_dma_hdr(struct sk_buff *skb)
23 skb_pull(skb, sizeof(struct mt76x02_txwi) + MT_DMA_HDR_LEN);
24 hdr_len = ieee80211_get_hdrlen_from_skb(skb);
26 mt76x02_remove_hdr_pad(skb, 2);
29 void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, enum mt76_txq_id qid,
30 struct mt76_queue_entry *e)
32 mt76x02u_remove_dma_hdr(e->skb);
33 mt76_tx_complete_skb(mdev, e->skb);
35 EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb);
37 int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags)
39 struct sk_buff *iter, *last = skb;
43 * | 4B | xfer len | pad | 4B |
44 * | TXINFO | pkt/cmd | zero pad to 4B | zero |
46 * length field of TXINFO should be set to 'xfer len'.
48 info = FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
49 FIELD_PREP(MT_TXD_INFO_DPORT, port) | flags;
50 put_unaligned_le32(info, skb_push(skb, sizeof(info)));
52 /* Add zero pad of 4 - 7 bytes */
53 pad = round_up(skb->len, 4) + 4 - skb->len;
55 /* First packet of a A-MSDU burst keeps track of the whole burst
56 * length, need to update length of it and the last packet.
58 skb_walk_frags(skb, iter) {
67 if (skb_pad(last, pad))
74 int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
75 enum mt76_txq_id qid, struct mt76_wcid *wcid,
76 struct ieee80211_sta *sta,
77 struct mt76_tx_info *tx_info)
79 struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76);
80 int pid, len = tx_info->skb->len, ep = q2ep(mdev->q_tx[qid].q->hw_idx);
81 struct mt76x02_txwi *txwi;
82 bool ampdu = IEEE80211_SKB_CB(tx_info->skb)->flags & IEEE80211_TX_CTL_AMPDU;
86 mt76_insert_hdr_pad(tx_info->skb);
88 txwi = (struct mt76x02_txwi *)(tx_info->skb->data - sizeof(*txwi));
89 mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len);
90 skb_push(tx_info->skb, sizeof(*txwi));
92 pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
94 /* encode packet rate for no-skb packet id to fix up status reporting */
95 if (pid == MT_PACKET_ID_NO_SKB)
96 pid = MT_PACKET_ID_HAS_RATE |
97 (le16_to_cpu(txwi->rate) & MT_RXWI_RATE_INDEX);
101 if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA)
106 flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
108 if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv)
109 flags |= MT_TXD_INFO_WIV;
111 return mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags);
113 EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb);
115 /* Trigger pre-TBTT event 8 ms before TBTT */
116 #define PRE_TBTT_USEC 8000
118 /* Beacon SRAM memory is limited to 8kB. We need to send PS buffered frames
119 * (which can be 1500 bytes big) via beacon memory. That make limit of number
120 * of slots to 5. TODO: dynamically calculate offsets in beacon SRAM.
122 #define N_BCN_SLOTS 5
124 static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev)
129 /* Get remaining TBTT in usec */
130 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
133 if (tbtt <= PRE_TBTT_USEC) {
134 queue_work(system_highpri_wq, &dev->pre_tbtt_work);
138 time = (tbtt - PRE_TBTT_USEC) * 1000ull;
139 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
142 static void mt76x02u_restart_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 dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0);
152 dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1);
153 tsf = (u64)dw0 << 32 | dw1;
154 dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt);
156 /* Convert beacon interval in TU (1024 usec) to nsec */
157 time = ((1000000000ull * dev->mt76.beacon_int) >> 10);
159 /* Adjust time to trigger hrtimer 8ms before TBTT */
160 if (tbtt < PRE_TBTT_USEC)
161 time -= (PRE_TBTT_USEC - tbtt) * 1000ull;
163 time += (tbtt - PRE_TBTT_USEC) * 1000ull;
165 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
168 static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev)
171 hrtimer_cancel(&dev->pre_tbtt_timer);
172 cancel_work_sync(&dev->pre_tbtt_work);
173 /* Timer can be rearmed by work. */
174 } while (hrtimer_active(&dev->pre_tbtt_timer));
177 static void mt76x02u_pre_tbtt_work(struct work_struct *work)
179 struct mt76x02_dev *dev =
180 container_of(work, struct mt76x02_dev, pre_tbtt_work);
181 struct beacon_bc_data data = {};
185 if (!dev->mt76.beacon_mask)
188 if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL)
191 mt76x02_resync_beacon_timer(dev);
193 ieee80211_iterate_active_interfaces(mt76_hw(dev),
194 IEEE80211_IFACE_ITER_RESUME_ALL,
195 mt76x02_update_beacon_iter, dev);
197 nbeacons = hweight8(dev->mt76.beacon_mask);
198 mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons);
200 for (i = nbeacons; i < N_BCN_SLOTS; i++) {
201 skb = __skb_dequeue(&data.q);
202 mt76x02_mac_set_beacon(dev, i, skb);
205 mt76x02u_restart_pre_tbtt_timer(dev);
208 static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer)
210 struct mt76x02_dev *dev =
211 container_of(timer, struct mt76x02_dev, pre_tbtt_timer);
213 queue_work(system_highpri_wq, &dev->pre_tbtt_work);
215 return HRTIMER_NORESTART;
218 static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en)
220 if (en && dev->mt76.beacon_mask &&
221 !hrtimer_active(&dev->pre_tbtt_timer))
222 mt76x02u_start_pre_tbtt_timer(dev);
224 mt76x02u_stop_pre_tbtt_timer(dev);
227 static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en)
231 if (WARN_ON_ONCE(!dev->mt76.beacon_int))
235 mt76x02u_start_pre_tbtt_timer(dev);
237 /* Timer is already stopped, only clean up
238 * PS buffered frames if any.
240 for (i = 0; i < N_BCN_SLOTS; i++)
241 mt76x02_mac_set_beacon(dev, i, NULL);
245 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev)
247 static const struct mt76x02_beacon_ops beacon_ops = {
248 .nslots = N_BCN_SLOTS,
249 .slot_size = (8192 / N_BCN_SLOTS) & ~63,
250 .pre_tbtt_enable = mt76x02u_pre_tbtt_enable,
251 .beacon_enable = mt76x02u_beacon_enable,
253 dev->beacon_ops = &beacon_ops;
255 hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
256 dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt;
257 INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work);
259 mt76x02_init_beacon_config(dev);
261 EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config);
263 void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev)
265 if (!test_bit(MT76_REMOVED, &dev->mt76.state))
266 mt76_clear(dev, MT_BEACON_TIME_CFG,
267 MT_BEACON_TIME_CFG_TIMER_EN |
268 MT_BEACON_TIME_CFG_SYNC_MODE |
269 MT_BEACON_TIME_CFG_TBTT_EN |
270 MT_BEACON_TIME_CFG_BEACON_TX);
272 mt76x02u_stop_pre_tbtt_timer(dev);
274 EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config);