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, enum mt76_txq_id qid, 19 struct mt76_queue_entry *e) 20 { 21 mt76x02u_remove_dma_hdr(e->skb); 22 mt76_tx_complete_skb(mdev, e->skb); 23 } 24 EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb); 25 26 int mt76x02u_mac_start(struct mt76x02_dev *dev) 27 { 28 mt76x02_mac_reset_counters(dev); 29 30 mt76_wr(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_ENABLE_TX); 31 if (!mt76x02_wait_for_wpdma(&dev->mt76, 200000)) 32 return -ETIMEDOUT; 33 34 mt76_wr(dev, MT_RX_FILTR_CFG, dev->mt76.rxfilter); 35 36 mt76_wr(dev, MT_MAC_SYS_CTRL, 37 MT_MAC_SYS_CTRL_ENABLE_TX | 38 MT_MAC_SYS_CTRL_ENABLE_RX); 39 40 if (!mt76x02_wait_for_wpdma(&dev->mt76, 50)) 41 return -ETIMEDOUT; 42 43 return 0; 44 } 45 EXPORT_SYMBOL_GPL(mt76x02u_mac_start); 46 47 int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags) 48 { 49 struct sk_buff *iter, *last = skb; 50 u32 info, pad; 51 52 /* Buffer layout: 53 * | 4B | xfer len | pad | 4B | 54 * | TXINFO | pkt/cmd | zero pad to 4B | zero | 55 * 56 * length field of TXINFO should be set to 'xfer len'. 57 */ 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))); 61 62 /* Add zero pad of 4 - 7 bytes */ 63 pad = round_up(skb->len, 4) + 4 - skb->len; 64 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. 67 */ 68 skb_walk_frags(skb, iter) { 69 last = iter; 70 if (!iter->next) { 71 skb->data_len += pad; 72 skb->len += pad; 73 break; 74 } 75 } 76 77 if (skb_pad(last, pad)) 78 return -ENOMEM; 79 __skb_put(last, pad); 80 81 return 0; 82 } 83 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) 88 { 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; 93 enum mt76_qsel qsel; 94 u32 flags; 95 96 mt76_insert_hdr_pad(tx_info->skb); 97 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)); 101 102 pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb); 103 104 /* 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)); 110 111 txwi->pktid = pid; 112 113 if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA) 114 qsel = MT_QSEL_MGMT; 115 else 116 qsel = MT_QSEL_EDCA; 117 118 flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) | 119 MT_TXD_INFO_80211; 120 if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv) 121 flags |= MT_TXD_INFO_WIV; 122 123 if (sta) { 124 struct mt76x02_sta *msta = (struct mt76x02_sta *)sta->drv_priv; 125 126 ewma_pktlen_add(&msta->pktlen, tx_info->skb->len); 127 } 128 129 return mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags); 130 } 131 EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb); 132 133 /* Trigger pre-TBTT event 8 ms before TBTT */ 134 #define PRE_TBTT_USEC 8000 135 136 /* 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. 139 */ 140 #define N_BCN_SLOTS 5 141 142 static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev) 143 { 144 u64 time; 145 u32 tbtt; 146 147 /* Get remaining TBTT in usec */ 148 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); 149 tbtt *= 32; 150 151 if (tbtt <= PRE_TBTT_USEC) { 152 queue_work(system_highpri_wq, &dev->pre_tbtt_work); 153 return; 154 } 155 156 time = (tbtt - PRE_TBTT_USEC) * 1000ull; 157 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); 158 } 159 160 static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev) 161 { 162 u32 tbtt, dw0, dw1; 163 u64 tsf, time; 164 165 /* Get remaining TBTT in usec */ 166 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); 167 tbtt *= 32; 168 169 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); 173 174 /* Convert beacon interval in TU (1024 usec) to nsec */ 175 time = ((1000000000ull * dev->mt76.beacon_int) >> 10); 176 177 /* Adjust time to trigger hrtimer 8ms before TBTT */ 178 if (tbtt < PRE_TBTT_USEC) 179 time -= (PRE_TBTT_USEC - tbtt) * 1000ull; 180 else 181 time += (tbtt - PRE_TBTT_USEC) * 1000ull; 182 183 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); 184 } 185 186 static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev) 187 { 188 do { 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)); 193 } 194 195 static void mt76x02u_pre_tbtt_work(struct work_struct *work) 196 { 197 struct mt76x02_dev *dev = 198 container_of(work, struct mt76x02_dev, pre_tbtt_work); 199 struct beacon_bc_data data = {}; 200 struct sk_buff *skb; 201 int i, nbeacons; 202 203 if (!dev->mt76.beacon_mask) 204 return; 205 206 if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL) 207 return; 208 209 mt76x02_resync_beacon_timer(dev); 210 211 ieee80211_iterate_active_interfaces(mt76_hw(dev), 212 IEEE80211_IFACE_ITER_RESUME_ALL, 213 mt76x02_update_beacon_iter, dev); 214 215 nbeacons = hweight8(dev->mt76.beacon_mask); 216 mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons); 217 218 for (i = nbeacons; i < N_BCN_SLOTS; i++) { 219 skb = __skb_dequeue(&data.q); 220 mt76x02_mac_set_beacon(dev, i, skb); 221 } 222 223 mt76x02u_restart_pre_tbtt_timer(dev); 224 } 225 226 static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer) 227 { 228 struct mt76x02_dev *dev = 229 container_of(timer, struct mt76x02_dev, pre_tbtt_timer); 230 231 queue_work(system_highpri_wq, &dev->pre_tbtt_work); 232 233 return HRTIMER_NORESTART; 234 } 235 236 static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en) 237 { 238 if (en && dev->mt76.beacon_mask && 239 !hrtimer_active(&dev->pre_tbtt_timer)) 240 mt76x02u_start_pre_tbtt_timer(dev); 241 if (!en) 242 mt76x02u_stop_pre_tbtt_timer(dev); 243 } 244 245 static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en) 246 { 247 int i; 248 249 if (WARN_ON_ONCE(!dev->mt76.beacon_int)) 250 return; 251 252 if (en) { 253 mt76x02u_start_pre_tbtt_timer(dev); 254 } else { 255 /* Timer is already stopped, only clean up 256 * PS buffered frames if any. 257 */ 258 for (i = 0; i < N_BCN_SLOTS; i++) 259 mt76x02_mac_set_beacon(dev, i, NULL); 260 } 261 } 262 263 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev) 264 { 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, 270 }; 271 dev->beacon_ops = &beacon_ops; 272 273 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); 276 277 mt76x02_init_beacon_config(dev); 278 } 279 EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config); 280 281 void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev) 282 { 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); 289 290 mt76x02u_stop_pre_tbtt_timer(dev); 291 } 292 EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config); 293