1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> 4 */ 5 6 #include "mt76x02_usb.h" 7 8 static void mt76x02u_remove_dma_hdr(struct sk_buff *skb) 9 { 10 int hdr_len; 11 12 skb_pull(skb, sizeof(struct mt76x02_txwi) + MT_DMA_HDR_LEN); 13 hdr_len = ieee80211_get_hdrlen_from_skb(skb); 14 if (hdr_len % 4) 15 mt76x02_remove_hdr_pad(skb, 2); 16 } 17 18 void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, struct mt76_queue_entry *e) 19 { 20 mt76x02u_remove_dma_hdr(e->skb); 21 mt76_tx_complete_skb(mdev, e->wcid, e->skb); 22 } 23 EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb); 24 25 int mt76x02u_mac_start(struct mt76x02_dev *dev) 26 { 27 mt76x02_mac_reset_counters(dev); 28 29 mt76_wr(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_ENABLE_TX); 30 if (!mt76x02_wait_for_wpdma(&dev->mt76, 200000)) 31 return -ETIMEDOUT; 32 33 mt76_wr(dev, MT_RX_FILTR_CFG, dev->mt76.rxfilter); 34 35 mt76_wr(dev, MT_MAC_SYS_CTRL, 36 MT_MAC_SYS_CTRL_ENABLE_TX | 37 MT_MAC_SYS_CTRL_ENABLE_RX); 38 39 if (!mt76x02_wait_for_wpdma(&dev->mt76, 50)) 40 return -ETIMEDOUT; 41 42 return 0; 43 } 44 EXPORT_SYMBOL_GPL(mt76x02u_mac_start); 45 46 int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags) 47 { 48 u32 info, pad; 49 50 /* Buffer layout: 51 * | 4B | xfer len | pad | 4B | 52 * | TXINFO | pkt/cmd | zero pad to 4B | zero | 53 * 54 * length field of TXINFO should be set to 'xfer len'. 55 */ 56 info = FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) | 57 FIELD_PREP(MT_TXD_INFO_DPORT, port) | flags; 58 put_unaligned_le32(info, skb_push(skb, sizeof(info))); 59 60 pad = round_up(skb->len, 4) + 4 - skb->len; 61 return mt76_skb_adjust_pad(skb, pad); 62 } 63 64 int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data, 65 enum mt76_txq_id qid, struct mt76_wcid *wcid, 66 struct ieee80211_sta *sta, 67 struct mt76_tx_info *tx_info) 68 { 69 struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76); 70 int pid, len = tx_info->skb->len, ep = q2ep(dev->mphy.q_tx[qid]->hw_idx); 71 struct mt76x02_txwi *txwi; 72 bool ampdu = IEEE80211_SKB_CB(tx_info->skb)->flags & IEEE80211_TX_CTL_AMPDU; 73 enum mt76_qsel qsel; 74 u32 flags; 75 76 mt76_insert_hdr_pad(tx_info->skb); 77 78 txwi = (struct mt76x02_txwi *)(tx_info->skb->data - sizeof(*txwi)); 79 mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len); 80 skb_push(tx_info->skb, sizeof(*txwi)); 81 82 pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb); 83 84 /* encode packet rate for no-skb packet id to fix up status reporting */ 85 if (pid == MT_PACKET_ID_NO_SKB) 86 pid = MT_PACKET_ID_HAS_RATE | 87 (le16_to_cpu(txwi->rate) & MT_PKTID_RATE) | 88 FIELD_PREP(MT_PKTID_AC, 89 skb_get_queue_mapping(tx_info->skb)); 90 91 txwi->pktid = pid; 92 93 if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA) 94 qsel = MT_QSEL_MGMT; 95 else 96 qsel = MT_QSEL_EDCA; 97 98 flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) | 99 MT_TXD_INFO_80211; 100 if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv) 101 flags |= MT_TXD_INFO_WIV; 102 103 if (sta) { 104 struct mt76x02_sta *msta = (struct mt76x02_sta *)sta->drv_priv; 105 106 ewma_pktlen_add(&msta->pktlen, tx_info->skb->len); 107 } 108 109 return mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags); 110 } 111 EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb); 112 113 /* Trigger pre-TBTT event 8 ms before TBTT */ 114 #define PRE_TBTT_USEC 8000 115 116 /* Beacon SRAM memory is limited to 8kB. We need to send PS buffered frames 117 * (which can be 1500 bytes big) via beacon memory. That make limit of number 118 * of slots to 5. TODO: dynamically calculate offsets in beacon SRAM. 119 */ 120 #define N_BCN_SLOTS 5 121 122 static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev) 123 { 124 u64 time; 125 u32 tbtt; 126 127 /* Get remaining TBTT in usec */ 128 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); 129 tbtt *= 32; 130 131 if (tbtt <= PRE_TBTT_USEC) { 132 queue_work(system_highpri_wq, &dev->pre_tbtt_work); 133 return; 134 } 135 136 time = (tbtt - PRE_TBTT_USEC) * 1000ull; 137 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); 138 } 139 140 static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev) 141 { 142 u32 tbtt, dw0, dw1; 143 u64 tsf, time; 144 145 /* Get remaining TBTT in usec */ 146 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); 147 tbtt *= 32; 148 149 dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0); 150 dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1); 151 tsf = (u64)dw0 << 32 | dw1; 152 dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt); 153 154 /* Convert beacon interval in TU (1024 usec) to nsec */ 155 time = ((1000000000ull * dev->mt76.beacon_int) >> 10); 156 157 /* Adjust time to trigger hrtimer 8ms before TBTT */ 158 if (tbtt < PRE_TBTT_USEC) 159 time -= (PRE_TBTT_USEC - tbtt) * 1000ull; 160 else 161 time += (tbtt - PRE_TBTT_USEC) * 1000ull; 162 163 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); 164 } 165 166 static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev) 167 { 168 do { 169 hrtimer_cancel(&dev->pre_tbtt_timer); 170 cancel_work_sync(&dev->pre_tbtt_work); 171 /* Timer can be rearmed by work. */ 172 } while (hrtimer_active(&dev->pre_tbtt_timer)); 173 } 174 175 static void mt76x02u_pre_tbtt_work(struct work_struct *work) 176 { 177 struct mt76x02_dev *dev = 178 container_of(work, struct mt76x02_dev, pre_tbtt_work); 179 struct beacon_bc_data data = {}; 180 struct sk_buff *skb; 181 int nbeacons; 182 183 if (!dev->mt76.beacon_mask) 184 return; 185 186 if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL) 187 return; 188 189 mt76x02_resync_beacon_timer(dev); 190 191 /* Prevent corrupt transmissions during update */ 192 mt76_set(dev, MT_BCN_BYPASS_MASK, 0xffff); 193 dev->beacon_data_count = 0; 194 195 ieee80211_iterate_active_interfaces(mt76_hw(dev), 196 IEEE80211_IFACE_ITER_RESUME_ALL, 197 mt76x02_update_beacon_iter, dev); 198 199 mt76_csa_check(&dev->mt76); 200 201 if (dev->mt76.csa_complete) { 202 mt76_csa_finish(&dev->mt76); 203 goto out; 204 } 205 206 nbeacons = hweight8(dev->mt76.beacon_mask); 207 mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons); 208 209 while ((skb = __skb_dequeue(&data.q)) != NULL) 210 mt76x02_mac_set_beacon(dev, skb); 211 212 out: 213 mt76_wr(dev, MT_BCN_BYPASS_MASK, 214 0xff00 | ~(0xff00 >> dev->beacon_data_count)); 215 216 mt76x02u_restart_pre_tbtt_timer(dev); 217 } 218 219 static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer) 220 { 221 struct mt76x02_dev *dev = 222 container_of(timer, struct mt76x02_dev, pre_tbtt_timer); 223 224 queue_work(system_highpri_wq, &dev->pre_tbtt_work); 225 226 return HRTIMER_NORESTART; 227 } 228 229 static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en) 230 { 231 if (en && dev->mt76.beacon_mask && 232 !hrtimer_active(&dev->pre_tbtt_timer)) 233 mt76x02u_start_pre_tbtt_timer(dev); 234 if (!en) 235 mt76x02u_stop_pre_tbtt_timer(dev); 236 } 237 238 static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en) 239 { 240 if (WARN_ON_ONCE(!dev->mt76.beacon_int)) 241 return; 242 243 if (en) 244 mt76x02u_start_pre_tbtt_timer(dev); 245 } 246 247 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev) 248 { 249 static const struct mt76x02_beacon_ops beacon_ops = { 250 .nslots = N_BCN_SLOTS, 251 .slot_size = (8192 / N_BCN_SLOTS) & ~63, 252 .pre_tbtt_enable = mt76x02u_pre_tbtt_enable, 253 .beacon_enable = mt76x02u_beacon_enable, 254 }; 255 dev->beacon_ops = &beacon_ops; 256 257 hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 258 dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt; 259 INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work); 260 261 mt76x02_init_beacon_config(dev); 262 } 263 EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config); 264 265 void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev) 266 { 267 if (!test_bit(MT76_REMOVED, &dev->mphy.state)) 268 mt76_clear(dev, MT_BEACON_TIME_CFG, 269 MT_BEACON_TIME_CFG_TIMER_EN | 270 MT_BEACON_TIME_CFG_SYNC_MODE | 271 MT_BEACON_TIME_CFG_TBTT_EN | 272 MT_BEACON_TIME_CFG_BEACON_TX); 273 274 mt76x02u_stop_pre_tbtt_timer(dev); 275 } 276 EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config); 277