| // SPDX-License-Identifier: ISC |
| /* |
| * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> |
| */ |
| |
| #include "mt76x02_usb.h" |
| |
| static void mt76x02u_remove_dma_hdr(struct sk_buff *skb) |
| { |
| int hdr_len; |
| |
| skb_pull(skb, sizeof(struct mt76x02_txwi) + MT_DMA_HDR_LEN); |
| hdr_len = ieee80211_get_hdrlen_from_skb(skb); |
| if (hdr_len % 4) |
| mt76x02_remove_hdr_pad(skb, 2); |
| } |
| |
| void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, struct mt76_queue_entry *e) |
| { |
| mt76x02u_remove_dma_hdr(e->skb); |
| mt76_tx_complete_skb(mdev, e->wcid, e->skb); |
| } |
| EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb); |
| |
| int mt76x02u_mac_start(struct mt76x02_dev *dev) |
| { |
| mt76x02_mac_reset_counters(dev); |
| |
| mt76_wr(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_ENABLE_TX); |
| if (!mt76x02_wait_for_wpdma(&dev->mt76, 200000)) |
| return -ETIMEDOUT; |
| |
| mt76_wr(dev, MT_RX_FILTR_CFG, dev->mt76.rxfilter); |
| |
| mt76_wr(dev, MT_MAC_SYS_CTRL, |
| MT_MAC_SYS_CTRL_ENABLE_TX | |
| MT_MAC_SYS_CTRL_ENABLE_RX); |
| |
| if (!mt76x02_wait_for_wpdma(&dev->mt76, 50)) |
| return -ETIMEDOUT; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(mt76x02u_mac_start); |
| |
| int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags) |
| { |
| u32 info, pad; |
| |
| /* Buffer layout: |
| * | 4B | xfer len | pad | 4B | |
| * | TXINFO | pkt/cmd | zero pad to 4B | zero | |
| * |
| * length field of TXINFO should be set to 'xfer len'. |
| */ |
| info = FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) | |
| FIELD_PREP(MT_TXD_INFO_DPORT, port) | flags; |
| put_unaligned_le32(info, skb_push(skb, sizeof(info))); |
| |
| pad = round_up(skb->len, 4) + 4 - skb->len; |
| return mt76_skb_adjust_pad(skb, pad); |
| } |
| |
| int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data, |
| enum mt76_txq_id qid, struct mt76_wcid *wcid, |
| struct ieee80211_sta *sta, |
| struct mt76_tx_info *tx_info) |
| { |
| struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76); |
| int pid, len = tx_info->skb->len, ep = q2ep(dev->mphy.q_tx[qid]->hw_idx); |
| struct mt76x02_txwi *txwi; |
| bool ampdu = IEEE80211_SKB_CB(tx_info->skb)->flags & IEEE80211_TX_CTL_AMPDU; |
| enum mt76_qsel qsel; |
| u32 flags; |
| |
| mt76_insert_hdr_pad(tx_info->skb); |
| |
| txwi = (struct mt76x02_txwi *)(tx_info->skb->data - sizeof(*txwi)); |
| mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len); |
| skb_push(tx_info->skb, sizeof(*txwi)); |
| |
| pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb); |
| |
| /* encode packet rate for no-skb packet id to fix up status reporting */ |
| if (pid == MT_PACKET_ID_NO_SKB) |
| pid = MT_PACKET_ID_HAS_RATE | |
| (le16_to_cpu(txwi->rate) & MT_PKTID_RATE) | |
| FIELD_PREP(MT_PKTID_AC, |
| skb_get_queue_mapping(tx_info->skb)); |
| |
| txwi->pktid = pid; |
| |
| if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA) |
| qsel = MT_QSEL_MGMT; |
| else |
| qsel = MT_QSEL_EDCA; |
| |
| flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) | |
| MT_TXD_INFO_80211; |
| if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv) |
| flags |= MT_TXD_INFO_WIV; |
| |
| if (sta) { |
| struct mt76x02_sta *msta = (struct mt76x02_sta *)sta->drv_priv; |
| |
| ewma_pktlen_add(&msta->pktlen, tx_info->skb->len); |
| } |
| |
| return mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags); |
| } |
| EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb); |
| |
| /* Trigger pre-TBTT event 8 ms before TBTT */ |
| #define PRE_TBTT_USEC 8000 |
| |
| /* Beacon SRAM memory is limited to 8kB. We need to send PS buffered frames |
| * (which can be 1500 bytes big) via beacon memory. That make limit of number |
| * of slots to 5. TODO: dynamically calculate offsets in beacon SRAM. |
| */ |
| #define N_BCN_SLOTS 5 |
| |
| static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev) |
| { |
| u64 time; |
| u32 tbtt; |
| |
| /* Get remaining TBTT in usec */ |
| tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); |
| tbtt *= 32; |
| |
| if (tbtt <= PRE_TBTT_USEC) { |
| queue_work(system_highpri_wq, &dev->pre_tbtt_work); |
| return; |
| } |
| |
| time = (tbtt - PRE_TBTT_USEC) * 1000ull; |
| hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); |
| } |
| |
| static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev) |
| { |
| u32 tbtt, dw0, dw1; |
| u64 tsf, time; |
| |
| /* Get remaining TBTT in usec */ |
| tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); |
| tbtt *= 32; |
| |
| dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0); |
| dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1); |
| tsf = (u64)dw0 << 32 | dw1; |
| dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt); |
| |
| /* Convert beacon interval in TU (1024 usec) to nsec */ |
| time = ((1000000000ull * dev->mt76.beacon_int) >> 10); |
| |
| /* Adjust time to trigger hrtimer 8ms before TBTT */ |
| if (tbtt < PRE_TBTT_USEC) |
| time -= (PRE_TBTT_USEC - tbtt) * 1000ull; |
| else |
| time += (tbtt - PRE_TBTT_USEC) * 1000ull; |
| |
| hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); |
| } |
| |
| static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev) |
| { |
| do { |
| hrtimer_cancel(&dev->pre_tbtt_timer); |
| cancel_work_sync(&dev->pre_tbtt_work); |
| /* Timer can be rearmed by work. */ |
| } while (hrtimer_active(&dev->pre_tbtt_timer)); |
| } |
| |
| static void mt76x02u_pre_tbtt_work(struct work_struct *work) |
| { |
| struct mt76x02_dev *dev = |
| container_of(work, struct mt76x02_dev, pre_tbtt_work); |
| struct beacon_bc_data data = {}; |
| struct sk_buff *skb; |
| int nbeacons; |
| |
| if (!dev->mt76.beacon_mask) |
| return; |
| |
| if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL) |
| return; |
| |
| mt76x02_resync_beacon_timer(dev); |
| |
| /* Prevent corrupt transmissions during update */ |
| mt76_set(dev, MT_BCN_BYPASS_MASK, 0xffff); |
| dev->beacon_data_count = 0; |
| |
| ieee80211_iterate_active_interfaces(mt76_hw(dev), |
| IEEE80211_IFACE_ITER_RESUME_ALL, |
| mt76x02_update_beacon_iter, dev); |
| |
| mt76_csa_check(&dev->mt76); |
| |
| if (dev->mt76.csa_complete) { |
| mt76_csa_finish(&dev->mt76); |
| goto out; |
| } |
| |
| nbeacons = hweight8(dev->mt76.beacon_mask); |
| mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons); |
| |
| while ((skb = __skb_dequeue(&data.q)) != NULL) |
| mt76x02_mac_set_beacon(dev, skb); |
| |
| out: |
| mt76_wr(dev, MT_BCN_BYPASS_MASK, |
| 0xff00 | ~(0xff00 >> dev->beacon_data_count)); |
| |
| mt76x02u_restart_pre_tbtt_timer(dev); |
| } |
| |
| static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer) |
| { |
| struct mt76x02_dev *dev = |
| container_of(timer, struct mt76x02_dev, pre_tbtt_timer); |
| |
| queue_work(system_highpri_wq, &dev->pre_tbtt_work); |
| |
| return HRTIMER_NORESTART; |
| } |
| |
| static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en) |
| { |
| if (en && dev->mt76.beacon_mask && |
| !hrtimer_active(&dev->pre_tbtt_timer)) |
| mt76x02u_start_pre_tbtt_timer(dev); |
| if (!en) |
| mt76x02u_stop_pre_tbtt_timer(dev); |
| } |
| |
| static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en) |
| { |
| if (WARN_ON_ONCE(!dev->mt76.beacon_int)) |
| return; |
| |
| if (en) |
| mt76x02u_start_pre_tbtt_timer(dev); |
| } |
| |
| void mt76x02u_init_beacon_config(struct mt76x02_dev *dev) |
| { |
| static const struct mt76x02_beacon_ops beacon_ops = { |
| .nslots = N_BCN_SLOTS, |
| .slot_size = (8192 / N_BCN_SLOTS) & ~63, |
| .pre_tbtt_enable = mt76x02u_pre_tbtt_enable, |
| .beacon_enable = mt76x02u_beacon_enable, |
| }; |
| dev->beacon_ops = &beacon_ops; |
| |
| hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt; |
| INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work); |
| |
| mt76x02_init_beacon_config(dev); |
| } |
| EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config); |
| |
| void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev) |
| { |
| if (!test_bit(MT76_REMOVED, &dev->mphy.state)) |
| mt76_clear(dev, MT_BEACON_TIME_CFG, |
| MT_BEACON_TIME_CFG_TIMER_EN | |
| MT_BEACON_TIME_CFG_SYNC_MODE | |
| MT_BEACON_TIME_CFG_TBTT_EN | |
| MT_BEACON_TIME_CFG_BEACON_TX); |
| |
| mt76x02u_stop_pre_tbtt_timer(dev); |
| } |
| EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config); |