264 lines
7.0 KiB
C
264 lines
7.0 KiB
C
// SPDX-License-Identifier: ISC
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/*
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* Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
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*/
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#include "mt76x02_usb.h"
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static void mt76x02u_remove_dma_hdr(struct sk_buff *skb)
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{
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int hdr_len;
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skb_pull(skb, sizeof(struct mt76x02_txwi) + MT_DMA_HDR_LEN);
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hdr_len = ieee80211_get_hdrlen_from_skb(skb);
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if (hdr_len % 4)
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mt76x02_remove_hdr_pad(skb, 2);
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}
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void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, enum mt76_txq_id qid,
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struct mt76_queue_entry *e)
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{
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mt76x02u_remove_dma_hdr(e->skb);
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mt76_tx_complete_skb(mdev, e->skb);
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}
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EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb);
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int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags)
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{
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struct sk_buff *iter, *last = skb;
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u32 info, pad;
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/* Buffer layout:
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* | 4B | xfer len | pad | 4B |
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* | TXINFO | pkt/cmd | zero pad to 4B | zero |
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*
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* length field of TXINFO should be set to 'xfer len'.
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*/
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info = FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) |
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FIELD_PREP(MT_TXD_INFO_DPORT, port) | flags;
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put_unaligned_le32(info, skb_push(skb, sizeof(info)));
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/* Add zero pad of 4 - 7 bytes */
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pad = round_up(skb->len, 4) + 4 - skb->len;
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/* First packet of a A-MSDU burst keeps track of the whole burst
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* length, need to update length of it and the last packet.
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*/
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skb_walk_frags(skb, iter) {
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last = iter;
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if (!iter->next) {
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skb->data_len += pad;
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skb->len += pad;
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break;
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}
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}
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if (skb_pad(last, pad))
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return -ENOMEM;
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__skb_put(last, pad);
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return 0;
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}
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int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data,
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enum mt76_txq_id qid, struct mt76_wcid *wcid,
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struct ieee80211_sta *sta,
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struct mt76_tx_info *tx_info)
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{
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struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76);
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int pid, len = tx_info->skb->len, ep = q2ep(mdev->q_tx[qid].q->hw_idx);
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struct mt76x02_txwi *txwi;
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bool ampdu = IEEE80211_SKB_CB(tx_info->skb)->flags & IEEE80211_TX_CTL_AMPDU;
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enum mt76_qsel qsel;
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u32 flags;
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mt76_insert_hdr_pad(tx_info->skb);
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txwi = (struct mt76x02_txwi *)(tx_info->skb->data - sizeof(*txwi));
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mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len);
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skb_push(tx_info->skb, sizeof(*txwi));
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pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
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/* encode packet rate for no-skb packet id to fix up status reporting */
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if (pid == MT_PACKET_ID_NO_SKB)
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pid = MT_PACKET_ID_HAS_RATE |
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(le16_to_cpu(txwi->rate) & MT_RXWI_RATE_INDEX);
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txwi->pktid = pid;
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if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA)
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qsel = MT_QSEL_MGMT;
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else
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qsel = MT_QSEL_EDCA;
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flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
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MT_TXD_INFO_80211;
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if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv)
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flags |= MT_TXD_INFO_WIV;
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return mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags);
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}
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EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb);
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/* Trigger pre-TBTT event 8 ms before TBTT */
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#define PRE_TBTT_USEC 8000
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/* Beacon SRAM memory is limited to 8kB. We need to send PS buffered frames
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* (which can be 1500 bytes big) via beacon memory. That make limit of number
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* of slots to 5. TODO: dynamically calculate offsets in beacon SRAM.
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*/
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#define N_BCN_SLOTS 5
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static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev)
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{
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u64 time;
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u32 tbtt;
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/* Get remaining TBTT in usec */
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tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
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tbtt *= 32;
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if (tbtt <= PRE_TBTT_USEC) {
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queue_work(system_highpri_wq, &dev->pre_tbtt_work);
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return;
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}
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time = (tbtt - PRE_TBTT_USEC) * 1000ull;
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hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
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}
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static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev)
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{
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u32 tbtt, dw0, dw1;
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u64 tsf, time;
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/* Get remaining TBTT in usec */
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tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL);
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tbtt *= 32;
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dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0);
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dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1);
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tsf = (u64)dw0 << 32 | dw1;
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dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt);
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/* Convert beacon interval in TU (1024 usec) to nsec */
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time = ((1000000000ull * dev->mt76.beacon_int) >> 10);
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/* Adjust time to trigger hrtimer 8ms before TBTT */
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if (tbtt < PRE_TBTT_USEC)
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time -= (PRE_TBTT_USEC - tbtt) * 1000ull;
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else
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time += (tbtt - PRE_TBTT_USEC) * 1000ull;
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hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL);
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}
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static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev)
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{
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do {
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hrtimer_cancel(&dev->pre_tbtt_timer);
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cancel_work_sync(&dev->pre_tbtt_work);
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/* Timer can be rearmed by work. */
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} while (hrtimer_active(&dev->pre_tbtt_timer));
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}
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static void mt76x02u_pre_tbtt_work(struct work_struct *work)
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{
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struct mt76x02_dev *dev =
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container_of(work, struct mt76x02_dev, pre_tbtt_work);
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struct beacon_bc_data data = {};
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struct sk_buff *skb;
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int i, nbeacons;
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if (!dev->mt76.beacon_mask)
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return;
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if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL)
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return;
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mt76x02_resync_beacon_timer(dev);
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ieee80211_iterate_active_interfaces(mt76_hw(dev),
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IEEE80211_IFACE_ITER_RESUME_ALL,
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mt76x02_update_beacon_iter, dev);
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nbeacons = hweight8(dev->mt76.beacon_mask);
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mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons);
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for (i = nbeacons; i < N_BCN_SLOTS; i++) {
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skb = __skb_dequeue(&data.q);
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mt76x02_mac_set_beacon(dev, i, skb);
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}
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mt76x02u_restart_pre_tbtt_timer(dev);
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}
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static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer)
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{
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struct mt76x02_dev *dev =
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container_of(timer, struct mt76x02_dev, pre_tbtt_timer);
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queue_work(system_highpri_wq, &dev->pre_tbtt_work);
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return HRTIMER_NORESTART;
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}
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static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en)
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{
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if (en && dev->mt76.beacon_mask &&
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!hrtimer_active(&dev->pre_tbtt_timer))
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mt76x02u_start_pre_tbtt_timer(dev);
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if (!en)
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mt76x02u_stop_pre_tbtt_timer(dev);
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}
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static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en)
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{
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int i;
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if (WARN_ON_ONCE(!dev->mt76.beacon_int))
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return;
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if (en) {
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mt76x02u_start_pre_tbtt_timer(dev);
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} else {
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/* Timer is already stopped, only clean up
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* PS buffered frames if any.
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*/
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for (i = 0; i < N_BCN_SLOTS; i++)
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mt76x02_mac_set_beacon(dev, i, NULL);
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}
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}
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void mt76x02u_init_beacon_config(struct mt76x02_dev *dev)
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{
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static const struct mt76x02_beacon_ops beacon_ops = {
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.nslots = N_BCN_SLOTS,
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.slot_size = (8192 / N_BCN_SLOTS) & ~63,
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.pre_tbtt_enable = mt76x02u_pre_tbtt_enable,
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.beacon_enable = mt76x02u_beacon_enable,
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};
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dev->beacon_ops = &beacon_ops;
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hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt;
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INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work);
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mt76x02_init_beacon_config(dev);
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}
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EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config);
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void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev)
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{
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if (!test_bit(MT76_REMOVED, &dev->mt76.state))
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mt76_clear(dev, MT_BEACON_TIME_CFG,
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MT_BEACON_TIME_CFG_TIMER_EN |
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MT_BEACON_TIME_CFG_SYNC_MODE |
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MT_BEACON_TIME_CFG_TBTT_EN |
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MT_BEACON_TIME_CFG_BEACON_TX);
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mt76x02u_stop_pre_tbtt_timer(dev);
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}
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EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config);
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