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