1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name> 4 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/irq.h> 9 10 #include "mt76x02.h" 11 #include "mt76x02_mcu.h" 12 #include "trace.h" 13 14 static void mt76x02_pre_tbtt_tasklet(struct tasklet_struct *t) 15 { 16 struct mt76x02_dev *dev = from_tasklet(dev, t, mt76.pre_tbtt_tasklet); 17 struct mt76_dev *mdev = &dev->mt76; 18 struct mt76_queue *q = dev->mphy.q_tx[MT_TXQ_PSD]; 19 struct beacon_bc_data data = { 20 .dev = dev, 21 }; 22 struct sk_buff *skb; 23 int i; 24 25 if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL) 26 return; 27 28 __skb_queue_head_init(&data.q); 29 30 mt76x02_resync_beacon_timer(dev); 31 32 /* Prevent corrupt transmissions during update */ 33 mt76_set(dev, MT_BCN_BYPASS_MASK, 0xffff); 34 dev->beacon_data_count = 0; 35 36 ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev), 37 IEEE80211_IFACE_ITER_RESUME_ALL, 38 mt76x02_update_beacon_iter, &data); 39 40 while ((skb = __skb_dequeue(&data.q)) != NULL) 41 mt76x02_mac_set_beacon(dev, skb); 42 43 mt76_wr(dev, MT_BCN_BYPASS_MASK, 44 0xff00 | ~(0xff00 >> dev->beacon_data_count)); 45 46 mt76_csa_check(mdev); 47 48 if (mdev->csa_complete) 49 return; 50 51 mt76x02_enqueue_buffered_bc(dev, &data, 8); 52 53 if (!skb_queue_len(&data.q)) 54 return; 55 56 for (i = 0; i < ARRAY_SIZE(data.tail); i++) { 57 if (!data.tail[i]) 58 continue; 59 60 mt76_skb_set_moredata(data.tail[i], false); 61 } 62 63 spin_lock(&q->lock); 64 while ((skb = __skb_dequeue(&data.q)) != NULL) { 65 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 66 struct ieee80211_vif *vif = info->control.vif; 67 struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv; 68 69 mt76_tx_queue_skb(dev, q, MT_TXQ_PSD, skb, &mvif->group_wcid, 70 NULL); 71 } 72 spin_unlock(&q->lock); 73 } 74 75 static void mt76x02e_pre_tbtt_enable(struct mt76x02_dev *dev, bool en) 76 { 77 if (en) 78 tasklet_enable(&dev->mt76.pre_tbtt_tasklet); 79 else 80 tasklet_disable(&dev->mt76.pre_tbtt_tasklet); 81 } 82 83 static void mt76x02e_beacon_enable(struct mt76x02_dev *dev, bool en) 84 { 85 mt76_rmw_field(dev, MT_INT_TIMER_EN, MT_INT_TIMER_EN_PRE_TBTT_EN, en); 86 if (en) 87 mt76x02_irq_enable(dev, MT_INT_PRE_TBTT | MT_INT_TBTT); 88 else 89 mt76x02_irq_disable(dev, MT_INT_PRE_TBTT | MT_INT_TBTT); 90 } 91 92 void mt76x02e_init_beacon_config(struct mt76x02_dev *dev) 93 { 94 static const struct mt76x02_beacon_ops beacon_ops = { 95 .nslots = 8, 96 .slot_size = 1024, 97 .pre_tbtt_enable = mt76x02e_pre_tbtt_enable, 98 .beacon_enable = mt76x02e_beacon_enable, 99 }; 100 101 dev->beacon_ops = &beacon_ops; 102 103 /* Fire a pre-TBTT interrupt 8 ms before TBTT */ 104 mt76_rmw_field(dev, MT_INT_TIMER_CFG, MT_INT_TIMER_CFG_PRE_TBTT, 105 8 << 4); 106 mt76_rmw_field(dev, MT_INT_TIMER_CFG, MT_INT_TIMER_CFG_GP_TIMER, 107 MT_DFS_GP_INTERVAL); 108 mt76_wr(dev, MT_INT_TIMER_EN, 0); 109 110 mt76x02_init_beacon_config(dev); 111 } 112 EXPORT_SYMBOL_GPL(mt76x02e_init_beacon_config); 113 114 static int 115 mt76x02_init_rx_queue(struct mt76x02_dev *dev, struct mt76_queue *q, 116 int idx, int n_desc, int bufsize) 117 { 118 int err; 119 120 err = mt76_queue_alloc(dev, q, idx, n_desc, bufsize, 121 MT_RX_RING_BASE); 122 if (err < 0) 123 return err; 124 125 mt76x02_irq_enable(dev, MT_INT_RX_DONE(idx)); 126 127 return 0; 128 } 129 130 static void mt76x02_process_tx_status_fifo(struct mt76x02_dev *dev) 131 { 132 struct mt76x02_tx_status stat; 133 u8 update = 1; 134 135 while (kfifo_get(&dev->txstatus_fifo, &stat)) 136 mt76x02_send_tx_status(dev, &stat, &update); 137 } 138 139 static void mt76x02_tx_worker(struct mt76_worker *w) 140 { 141 struct mt76x02_dev *dev; 142 143 dev = container_of(w, struct mt76x02_dev, mt76.tx_worker); 144 145 mt76x02_mac_poll_tx_status(dev, false); 146 mt76x02_process_tx_status_fifo(dev); 147 148 mt76_txq_schedule_all(&dev->mphy); 149 } 150 151 static int mt76x02_poll_tx(struct napi_struct *napi, int budget) 152 { 153 struct mt76x02_dev *dev = container_of(napi, struct mt76x02_dev, 154 mt76.tx_napi); 155 int i; 156 157 mt76x02_mac_poll_tx_status(dev, false); 158 159 mt76_queue_tx_cleanup(dev, dev->mt76.q_mcu[MT_MCUQ_WM], false); 160 for (i = MT_TXQ_PSD; i >= 0; i--) 161 mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[i], false); 162 163 if (napi_complete_done(napi, 0)) 164 mt76x02_irq_enable(dev, MT_INT_TX_DONE_ALL); 165 166 mt76_queue_tx_cleanup(dev, dev->mt76.q_mcu[MT_MCUQ_WM], false); 167 for (i = MT_TXQ_PSD; i >= 0; i--) 168 mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[i], false); 169 170 mt76_worker_schedule(&dev->mt76.tx_worker); 171 172 return 0; 173 } 174 175 int mt76x02_dma_init(struct mt76x02_dev *dev) 176 { 177 struct mt76_txwi_cache __maybe_unused *t; 178 int i, ret, fifo_size; 179 struct mt76_queue *q; 180 void *status_fifo; 181 182 BUILD_BUG_ON(sizeof(struct mt76x02_rxwi) > MT_RX_HEADROOM); 183 184 fifo_size = roundup_pow_of_two(32 * sizeof(struct mt76x02_tx_status)); 185 status_fifo = devm_kzalloc(dev->mt76.dev, fifo_size, GFP_KERNEL); 186 if (!status_fifo) 187 return -ENOMEM; 188 189 dev->mt76.tx_worker.fn = mt76x02_tx_worker; 190 tasklet_setup(&dev->mt76.pre_tbtt_tasklet, mt76x02_pre_tbtt_tasklet); 191 192 spin_lock_init(&dev->txstatus_fifo_lock); 193 kfifo_init(&dev->txstatus_fifo, status_fifo, fifo_size); 194 195 mt76_dma_attach(&dev->mt76); 196 197 mt76_wr(dev, MT_WPDMA_RST_IDX, ~0); 198 199 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 200 ret = mt76_init_tx_queue(&dev->mphy, i, mt76_ac_to_hwq(i), 201 MT76x02_TX_RING_SIZE, 202 MT_TX_RING_BASE, NULL, 0); 203 if (ret) 204 return ret; 205 } 206 207 ret = mt76_init_tx_queue(&dev->mphy, MT_TXQ_PSD, MT_TX_HW_QUEUE_MGMT, 208 MT76x02_PSD_RING_SIZE, MT_TX_RING_BASE, 209 NULL, 0); 210 if (ret) 211 return ret; 212 213 ret = mt76_init_mcu_queue(&dev->mt76, MT_MCUQ_WM, MT_TX_HW_QUEUE_MCU, 214 MT_MCU_RING_SIZE, MT_TX_RING_BASE); 215 if (ret) 216 return ret; 217 218 mt76x02_irq_enable(dev, 219 MT_INT_TX_DONE(IEEE80211_AC_VO) | 220 MT_INT_TX_DONE(IEEE80211_AC_VI) | 221 MT_INT_TX_DONE(IEEE80211_AC_BE) | 222 MT_INT_TX_DONE(IEEE80211_AC_BK) | 223 MT_INT_TX_DONE(MT_TX_HW_QUEUE_MGMT) | 224 MT_INT_TX_DONE(MT_TX_HW_QUEUE_MCU)); 225 226 ret = mt76x02_init_rx_queue(dev, &dev->mt76.q_rx[MT_RXQ_MCU], 1, 227 MT_MCU_RING_SIZE, MT_RX_BUF_SIZE); 228 if (ret) 229 return ret; 230 231 q = &dev->mt76.q_rx[MT_RXQ_MAIN]; 232 q->buf_offset = MT_RX_HEADROOM - sizeof(struct mt76x02_rxwi); 233 ret = mt76x02_init_rx_queue(dev, q, 0, MT76X02_RX_RING_SIZE, 234 MT_RX_BUF_SIZE); 235 if (ret) 236 return ret; 237 238 ret = mt76_init_queues(dev, mt76_dma_rx_poll); 239 if (ret) 240 return ret; 241 242 netif_napi_add_tx(&dev->mt76.tx_napi_dev, &dev->mt76.tx_napi, 243 mt76x02_poll_tx); 244 napi_enable(&dev->mt76.tx_napi); 245 246 return 0; 247 } 248 EXPORT_SYMBOL_GPL(mt76x02_dma_init); 249 250 void mt76x02_rx_poll_complete(struct mt76_dev *mdev, enum mt76_rxq_id q) 251 { 252 struct mt76x02_dev *dev; 253 254 dev = container_of(mdev, struct mt76x02_dev, mt76); 255 mt76x02_irq_enable(dev, MT_INT_RX_DONE(q)); 256 } 257 EXPORT_SYMBOL_GPL(mt76x02_rx_poll_complete); 258 259 irqreturn_t mt76x02_irq_handler(int irq, void *dev_instance) 260 { 261 struct mt76x02_dev *dev = dev_instance; 262 u32 intr, mask; 263 264 intr = mt76_rr(dev, MT_INT_SOURCE_CSR); 265 intr &= dev->mt76.mmio.irqmask; 266 mt76_wr(dev, MT_INT_SOURCE_CSR, intr); 267 268 if (!test_bit(MT76_STATE_INITIALIZED, &dev->mphy.state)) 269 return IRQ_NONE; 270 271 trace_dev_irq(&dev->mt76, intr, dev->mt76.mmio.irqmask); 272 273 mask = intr & (MT_INT_RX_DONE_ALL | MT_INT_GPTIMER); 274 if (intr & (MT_INT_TX_DONE_ALL | MT_INT_TX_STAT)) 275 mask |= MT_INT_TX_DONE_ALL; 276 277 mt76x02_irq_disable(dev, mask); 278 279 if (intr & MT_INT_RX_DONE(0)) 280 napi_schedule(&dev->mt76.napi[0]); 281 282 if (intr & MT_INT_RX_DONE(1)) 283 napi_schedule(&dev->mt76.napi[1]); 284 285 if (intr & MT_INT_PRE_TBTT) 286 tasklet_schedule(&dev->mt76.pre_tbtt_tasklet); 287 288 /* send buffered multicast frames now */ 289 if (intr & MT_INT_TBTT) { 290 if (dev->mt76.csa_complete) 291 mt76_csa_finish(&dev->mt76); 292 else 293 mt76_queue_kick(dev, dev->mphy.q_tx[MT_TXQ_PSD]); 294 } 295 296 if (intr & MT_INT_TX_STAT) 297 mt76x02_mac_poll_tx_status(dev, true); 298 299 if (intr & (MT_INT_TX_STAT | MT_INT_TX_DONE_ALL)) 300 napi_schedule(&dev->mt76.tx_napi); 301 302 if (intr & MT_INT_GPTIMER) 303 tasklet_schedule(&dev->dfs_pd.dfs_tasklet); 304 305 return IRQ_HANDLED; 306 } 307 EXPORT_SYMBOL_GPL(mt76x02_irq_handler); 308 309 static void mt76x02_dma_enable(struct mt76x02_dev *dev) 310 { 311 u32 val; 312 313 mt76_wr(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_ENABLE_TX); 314 mt76x02_wait_for_wpdma(&dev->mt76, 1000); 315 usleep_range(50, 100); 316 317 val = FIELD_PREP(MT_WPDMA_GLO_CFG_DMA_BURST_SIZE, 3) | 318 MT_WPDMA_GLO_CFG_TX_DMA_EN | 319 MT_WPDMA_GLO_CFG_RX_DMA_EN; 320 mt76_set(dev, MT_WPDMA_GLO_CFG, val); 321 mt76_clear(dev, MT_WPDMA_GLO_CFG, 322 MT_WPDMA_GLO_CFG_TX_WRITEBACK_DONE); 323 } 324 325 void mt76x02_dma_disable(struct mt76x02_dev *dev) 326 { 327 u32 val = mt76_rr(dev, MT_WPDMA_GLO_CFG); 328 329 val &= MT_WPDMA_GLO_CFG_DMA_BURST_SIZE | 330 MT_WPDMA_GLO_CFG_BIG_ENDIAN | 331 MT_WPDMA_GLO_CFG_HDR_SEG_LEN; 332 val |= MT_WPDMA_GLO_CFG_TX_WRITEBACK_DONE; 333 mt76_wr(dev, MT_WPDMA_GLO_CFG, val); 334 } 335 EXPORT_SYMBOL_GPL(mt76x02_dma_disable); 336 337 void mt76x02_mac_start(struct mt76x02_dev *dev) 338 { 339 mt76x02_mac_reset_counters(dev); 340 mt76x02_dma_enable(dev); 341 mt76_wr(dev, MT_RX_FILTR_CFG, dev->mt76.rxfilter); 342 mt76_wr(dev, MT_MAC_SYS_CTRL, 343 MT_MAC_SYS_CTRL_ENABLE_TX | 344 MT_MAC_SYS_CTRL_ENABLE_RX); 345 mt76x02_irq_enable(dev, 346 MT_INT_RX_DONE_ALL | MT_INT_TX_DONE_ALL | 347 MT_INT_TX_STAT); 348 } 349 EXPORT_SYMBOL_GPL(mt76x02_mac_start); 350 351 static bool mt76x02_tx_hang(struct mt76x02_dev *dev) 352 { 353 u32 dma_idx, prev_dma_idx; 354 struct mt76_queue *q; 355 int i; 356 357 for (i = 0; i < 4; i++) { 358 q = dev->mphy.q_tx[i]; 359 360 prev_dma_idx = dev->mt76.tx_dma_idx[i]; 361 dma_idx = readl(&q->regs->dma_idx); 362 dev->mt76.tx_dma_idx[i] = dma_idx; 363 364 if (!q->queued || prev_dma_idx != dma_idx) { 365 dev->tx_hang_check[i] = 0; 366 continue; 367 } 368 369 if (++dev->tx_hang_check[i] >= MT_TX_HANG_TH) 370 return true; 371 } 372 373 return false; 374 } 375 376 static void mt76x02_key_sync(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 377 struct ieee80211_sta *sta, 378 struct ieee80211_key_conf *key, void *data) 379 { 380 struct mt76x02_dev *dev = hw->priv; 381 struct mt76_wcid *wcid; 382 383 if (!sta) 384 return; 385 386 wcid = (struct mt76_wcid *)sta->drv_priv; 387 388 if (wcid->hw_key_idx != key->keyidx || wcid->sw_iv) 389 return; 390 391 mt76x02_mac_wcid_sync_pn(dev, wcid->idx, key); 392 } 393 394 static void mt76x02_reset_state(struct mt76x02_dev *dev) 395 { 396 int i; 397 398 lockdep_assert_held(&dev->mt76.mutex); 399 400 clear_bit(MT76_STATE_RUNNING, &dev->mphy.state); 401 402 rcu_read_lock(); 403 ieee80211_iter_keys_rcu(dev->mt76.hw, NULL, mt76x02_key_sync, NULL); 404 rcu_read_unlock(); 405 406 for (i = 0; i < MT76x02_N_WCIDS; i++) { 407 struct ieee80211_sta *sta; 408 struct ieee80211_vif *vif; 409 struct mt76x02_sta *msta; 410 struct mt76_wcid *wcid; 411 void *priv; 412 413 wcid = rcu_dereference_protected(dev->mt76.wcid[i], 414 lockdep_is_held(&dev->mt76.mutex)); 415 if (!wcid) 416 continue; 417 418 rcu_assign_pointer(dev->mt76.wcid[i], NULL); 419 420 priv = msta = container_of(wcid, struct mt76x02_sta, wcid); 421 sta = container_of(priv, struct ieee80211_sta, drv_priv); 422 423 priv = msta->vif; 424 vif = container_of(priv, struct ieee80211_vif, drv_priv); 425 426 __mt76_sta_remove(&dev->mt76, vif, sta); 427 memset(msta, 0, sizeof(*msta)); 428 } 429 430 dev->mt76.vif_mask = 0; 431 dev->mt76.beacon_mask = 0; 432 } 433 434 static void mt76x02_watchdog_reset(struct mt76x02_dev *dev) 435 { 436 u32 mask = dev->mt76.mmio.irqmask; 437 bool restart = dev->mt76.mcu_ops->mcu_restart; 438 int i; 439 440 ieee80211_stop_queues(dev->mt76.hw); 441 set_bit(MT76_RESET, &dev->mphy.state); 442 443 tasklet_disable(&dev->mt76.pre_tbtt_tasklet); 444 mt76_worker_disable(&dev->mt76.tx_worker); 445 napi_disable(&dev->mt76.tx_napi); 446 447 mt76_for_each_q_rx(&dev->mt76, i) { 448 napi_disable(&dev->mt76.napi[i]); 449 } 450 451 mutex_lock(&dev->mt76.mutex); 452 453 dev->mcu_timeout = 0; 454 if (restart) 455 mt76x02_reset_state(dev); 456 457 if (dev->mt76.beacon_mask) 458 mt76_clear(dev, MT_BEACON_TIME_CFG, 459 MT_BEACON_TIME_CFG_BEACON_TX | 460 MT_BEACON_TIME_CFG_TBTT_EN); 461 462 mt76x02_irq_disable(dev, mask); 463 464 /* perform device reset */ 465 mt76_clear(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN); 466 mt76_wr(dev, MT_MAC_SYS_CTRL, 0); 467 mt76_clear(dev, MT_WPDMA_GLO_CFG, 468 MT_WPDMA_GLO_CFG_TX_DMA_EN | MT_WPDMA_GLO_CFG_RX_DMA_EN); 469 usleep_range(5000, 10000); 470 mt76_wr(dev, MT_INT_SOURCE_CSR, 0xffffffff); 471 472 /* let fw reset DMA */ 473 mt76_set(dev, 0x734, 0x3); 474 475 if (restart) 476 mt76_mcu_restart(dev); 477 478 mt76_queue_tx_cleanup(dev, dev->mt76.q_mcu[MT_MCUQ_WM], true); 479 for (i = 0; i < __MT_TXQ_MAX; i++) 480 mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[i], true); 481 482 mt76_for_each_q_rx(&dev->mt76, i) { 483 mt76_queue_rx_reset(dev, i); 484 } 485 486 mt76_tx_status_check(&dev->mt76, true); 487 488 mt76x02_mac_start(dev); 489 490 if (dev->ed_monitor) 491 mt76_set(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN); 492 493 if (dev->mt76.beacon_mask && !restart) 494 mt76_set(dev, MT_BEACON_TIME_CFG, 495 MT_BEACON_TIME_CFG_BEACON_TX | 496 MT_BEACON_TIME_CFG_TBTT_EN); 497 498 mt76x02_irq_enable(dev, mask); 499 500 mutex_unlock(&dev->mt76.mutex); 501 502 clear_bit(MT76_RESET, &dev->mphy.state); 503 504 mt76_worker_enable(&dev->mt76.tx_worker); 505 tasklet_enable(&dev->mt76.pre_tbtt_tasklet); 506 507 local_bh_disable(); 508 napi_enable(&dev->mt76.tx_napi); 509 napi_schedule(&dev->mt76.tx_napi); 510 511 mt76_for_each_q_rx(&dev->mt76, i) { 512 napi_enable(&dev->mt76.napi[i]); 513 napi_schedule(&dev->mt76.napi[i]); 514 } 515 local_bh_enable(); 516 517 if (restart) { 518 set_bit(MT76_RESTART, &dev->mphy.state); 519 mt76x02_mcu_function_select(dev, Q_SELECT, 1); 520 ieee80211_restart_hw(dev->mt76.hw); 521 } else { 522 ieee80211_wake_queues(dev->mt76.hw); 523 mt76_txq_schedule_all(&dev->mphy); 524 } 525 } 526 527 void mt76x02_reconfig_complete(struct ieee80211_hw *hw, 528 enum ieee80211_reconfig_type reconfig_type) 529 { 530 struct mt76x02_dev *dev = hw->priv; 531 532 if (reconfig_type != IEEE80211_RECONFIG_TYPE_RESTART) 533 return; 534 535 clear_bit(MT76_RESTART, &dev->mphy.state); 536 } 537 EXPORT_SYMBOL_GPL(mt76x02_reconfig_complete); 538 539 static void mt76x02_check_tx_hang(struct mt76x02_dev *dev) 540 { 541 if (test_bit(MT76_RESTART, &dev->mphy.state)) 542 return; 543 544 if (!mt76x02_tx_hang(dev) && !dev->mcu_timeout) 545 return; 546 547 mt76x02_watchdog_reset(dev); 548 549 dev->tx_hang_reset++; 550 memset(dev->tx_hang_check, 0, sizeof(dev->tx_hang_check)); 551 memset(dev->mt76.tx_dma_idx, 0xff, 552 sizeof(dev->mt76.tx_dma_idx)); 553 } 554 555 void mt76x02_wdt_work(struct work_struct *work) 556 { 557 struct mt76x02_dev *dev = container_of(work, struct mt76x02_dev, 558 wdt_work.work); 559 560 mt76x02_check_tx_hang(dev); 561 562 ieee80211_queue_delayed_work(mt76_hw(dev), &dev->wdt_work, 563 MT_WATCHDOG_TIME); 564 } 565