1 /* 2 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name> 3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/irq.h> 20 21 #include "mt76x02.h" 22 #include "mt76x02_mcu.h" 23 #include "mt76x02_trace.h" 24 25 static void mt76x02_pre_tbtt_tasklet(unsigned long arg) 26 { 27 struct mt76x02_dev *dev = (struct mt76x02_dev *)arg; 28 struct mt76_queue *q = dev->mt76.q_tx[MT_TXQ_PSD].q; 29 struct beacon_bc_data data = {}; 30 struct sk_buff *skb; 31 int i; 32 33 if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL) 34 return; 35 36 mt76x02_resync_beacon_timer(dev); 37 38 ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev), 39 IEEE80211_IFACE_ITER_RESUME_ALL, 40 mt76x02_update_beacon_iter, dev); 41 42 mt76_csa_check(&dev->mt76); 43 44 if (dev->mt76.csa_complete) 45 return; 46 47 mt76x02_enqueue_buffered_bc(dev, &data, 8); 48 49 if (!skb_queue_len(&data.q)) 50 return; 51 52 for (i = 0; i < ARRAY_SIZE(data.tail); i++) { 53 if (!data.tail[i]) 54 continue; 55 56 mt76_skb_set_moredata(data.tail[i], false); 57 } 58 59 spin_lock_bh(&q->lock); 60 while ((skb = __skb_dequeue(&data.q)) != NULL) { 61 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 62 struct ieee80211_vif *vif = info->control.vif; 63 struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv; 64 65 mt76_tx_queue_skb(dev, MT_TXQ_PSD, skb, &mvif->group_wcid, 66 NULL); 67 } 68 spin_unlock_bh(&q->lock); 69 } 70 71 static void mt76x02e_pre_tbtt_enable(struct mt76x02_dev *dev, bool en) 72 { 73 if (en) 74 tasklet_enable(&dev->mt76.pre_tbtt_tasklet); 75 else 76 tasklet_disable(&dev->mt76.pre_tbtt_tasklet); 77 } 78 79 static void mt76x02e_beacon_enable(struct mt76x02_dev *dev, bool en) 80 { 81 mt76_rmw_field(dev, MT_INT_TIMER_EN, MT_INT_TIMER_EN_PRE_TBTT_EN, en); 82 if (en) 83 mt76x02_irq_enable(dev, MT_INT_PRE_TBTT | MT_INT_TBTT); 84 else 85 mt76x02_irq_disable(dev, MT_INT_PRE_TBTT | MT_INT_TBTT); 86 } 87 88 void mt76x02e_init_beacon_config(struct mt76x02_dev *dev) 89 { 90 static const struct mt76x02_beacon_ops beacon_ops = { 91 .nslots = 8, 92 .slot_size = 1024, 93 .pre_tbtt_enable = mt76x02e_pre_tbtt_enable, 94 .beacon_enable = mt76x02e_beacon_enable, 95 }; 96 97 dev->beacon_ops = &beacon_ops; 98 99 /* Fire a pre-TBTT interrupt 8 ms before TBTT */ 100 mt76_rmw_field(dev, MT_INT_TIMER_CFG, MT_INT_TIMER_CFG_PRE_TBTT, 8 << 4); 101 mt76_rmw_field(dev, MT_INT_TIMER_CFG, MT_INT_TIMER_CFG_GP_TIMER, 102 MT_DFS_GP_INTERVAL); 103 mt76_wr(dev, MT_INT_TIMER_EN, 0); 104 105 mt76x02_init_beacon_config(dev); 106 } 107 EXPORT_SYMBOL_GPL(mt76x02e_init_beacon_config); 108 109 static int 110 mt76x02_init_tx_queue(struct mt76x02_dev *dev, struct mt76_sw_queue *q, 111 int idx, int n_desc) 112 { 113 struct mt76_queue *hwq; 114 int err; 115 116 hwq = devm_kzalloc(dev->mt76.dev, sizeof(*hwq), GFP_KERNEL); 117 if (!hwq) 118 return -ENOMEM; 119 120 err = mt76_queue_alloc(dev, hwq, idx, n_desc, 0, MT_TX_RING_BASE); 121 if (err < 0) 122 return err; 123 124 INIT_LIST_HEAD(&q->swq); 125 q->q = hwq; 126 127 mt76x02_irq_enable(dev, MT_INT_TX_DONE(idx)); 128 129 return 0; 130 } 131 132 static int 133 mt76x02_init_rx_queue(struct mt76x02_dev *dev, struct mt76_queue *q, 134 int idx, int n_desc, int bufsize) 135 { 136 int err; 137 138 err = mt76_queue_alloc(dev, q, idx, n_desc, bufsize, 139 MT_RX_RING_BASE); 140 if (err < 0) 141 return err; 142 143 mt76x02_irq_enable(dev, MT_INT_RX_DONE(idx)); 144 145 return 0; 146 } 147 148 static void mt76x02_process_tx_status_fifo(struct mt76x02_dev *dev) 149 { 150 struct mt76x02_tx_status stat; 151 u8 update = 1; 152 153 while (kfifo_get(&dev->txstatus_fifo, &stat)) 154 mt76x02_send_tx_status(dev, &stat, &update); 155 } 156 157 static void mt76x02_tx_tasklet(unsigned long data) 158 { 159 struct mt76x02_dev *dev = (struct mt76x02_dev *)data; 160 161 mt76x02_mac_poll_tx_status(dev, false); 162 mt76x02_process_tx_status_fifo(dev); 163 164 mt76_txq_schedule_all(&dev->mt76); 165 } 166 167 static int mt76x02_poll_tx(struct napi_struct *napi, int budget) 168 { 169 struct mt76x02_dev *dev = container_of(napi, struct mt76x02_dev, 170 mt76.tx_napi); 171 int i; 172 173 mt76x02_mac_poll_tx_status(dev, false); 174 175 for (i = MT_TXQ_MCU; i >= 0; i--) 176 mt76_queue_tx_cleanup(dev, i, false); 177 178 if (napi_complete_done(napi, 0)) 179 mt76x02_irq_enable(dev, MT_INT_TX_DONE_ALL); 180 181 for (i = MT_TXQ_MCU; i >= 0; i--) 182 mt76_queue_tx_cleanup(dev, i, false); 183 184 tasklet_schedule(&dev->mt76.tx_tasklet); 185 186 return 0; 187 } 188 189 int mt76x02_dma_init(struct mt76x02_dev *dev) 190 { 191 struct mt76_txwi_cache __maybe_unused *t; 192 int i, ret, fifo_size; 193 struct mt76_queue *q; 194 void *status_fifo; 195 196 BUILD_BUG_ON(sizeof(struct mt76x02_rxwi) > MT_RX_HEADROOM); 197 198 fifo_size = roundup_pow_of_two(32 * sizeof(struct mt76x02_tx_status)); 199 status_fifo = devm_kzalloc(dev->mt76.dev, fifo_size, GFP_KERNEL); 200 if (!status_fifo) 201 return -ENOMEM; 202 203 tasklet_init(&dev->mt76.tx_tasklet, mt76x02_tx_tasklet, 204 (unsigned long) dev); 205 tasklet_init(&dev->mt76.pre_tbtt_tasklet, mt76x02_pre_tbtt_tasklet, 206 (unsigned long)dev); 207 208 spin_lock_init(&dev->txstatus_fifo_lock); 209 kfifo_init(&dev->txstatus_fifo, status_fifo, fifo_size); 210 211 mt76_dma_attach(&dev->mt76); 212 213 mt76_wr(dev, MT_WPDMA_RST_IDX, ~0); 214 215 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 216 ret = mt76x02_init_tx_queue(dev, &dev->mt76.q_tx[i], 217 mt76_ac_to_hwq(i), 218 MT_TX_RING_SIZE); 219 if (ret) 220 return ret; 221 } 222 223 ret = mt76x02_init_tx_queue(dev, &dev->mt76.q_tx[MT_TXQ_PSD], 224 MT_TX_HW_QUEUE_MGMT, MT_TX_RING_SIZE); 225 if (ret) 226 return ret; 227 228 ret = mt76x02_init_tx_queue(dev, &dev->mt76.q_tx[MT_TXQ_MCU], 229 MT_TX_HW_QUEUE_MCU, MT_MCU_RING_SIZE); 230 if (ret) 231 return ret; 232 233 ret = mt76x02_init_rx_queue(dev, &dev->mt76.q_rx[MT_RXQ_MCU], 1, 234 MT_MCU_RING_SIZE, MT_RX_BUF_SIZE); 235 if (ret) 236 return ret; 237 238 q = &dev->mt76.q_rx[MT_RXQ_MAIN]; 239 q->buf_offset = MT_RX_HEADROOM - sizeof(struct mt76x02_rxwi); 240 ret = mt76x02_init_rx_queue(dev, q, 0, MT76X02_RX_RING_SIZE, 241 MT_RX_BUF_SIZE); 242 if (ret) 243 return ret; 244 245 ret = mt76_init_queues(dev); 246 if (ret) 247 return ret; 248 249 netif_tx_napi_add(&dev->mt76.napi_dev, &dev->mt76.tx_napi, 250 mt76x02_poll_tx, NAPI_POLL_WEIGHT); 251 napi_enable(&dev->mt76.tx_napi); 252 253 return 0; 254 } 255 EXPORT_SYMBOL_GPL(mt76x02_dma_init); 256 257 void mt76x02_rx_poll_complete(struct mt76_dev *mdev, enum mt76_rxq_id q) 258 { 259 struct mt76x02_dev *dev; 260 261 dev = container_of(mdev, struct mt76x02_dev, mt76); 262 mt76x02_irq_enable(dev, MT_INT_RX_DONE(q)); 263 } 264 EXPORT_SYMBOL_GPL(mt76x02_rx_poll_complete); 265 266 irqreturn_t mt76x02_irq_handler(int irq, void *dev_instance) 267 { 268 struct mt76x02_dev *dev = dev_instance; 269 u32 intr; 270 271 intr = mt76_rr(dev, MT_INT_SOURCE_CSR); 272 mt76_wr(dev, MT_INT_SOURCE_CSR, intr); 273 274 if (!test_bit(MT76_STATE_INITIALIZED, &dev->mt76.state)) 275 return IRQ_NONE; 276 277 trace_dev_irq(dev, intr, dev->mt76.mmio.irqmask); 278 279 intr &= dev->mt76.mmio.irqmask; 280 281 if (intr & MT_INT_RX_DONE(0)) { 282 mt76x02_irq_disable(dev, MT_INT_RX_DONE(0)); 283 napi_schedule(&dev->mt76.napi[0]); 284 } 285 286 if (intr & MT_INT_RX_DONE(1)) { 287 mt76x02_irq_disable(dev, MT_INT_RX_DONE(1)); 288 napi_schedule(&dev->mt76.napi[1]); 289 } 290 291 if (intr & MT_INT_PRE_TBTT) 292 tasklet_schedule(&dev->mt76.pre_tbtt_tasklet); 293 294 /* send buffered multicast frames now */ 295 if (intr & MT_INT_TBTT) { 296 if (dev->mt76.csa_complete) 297 mt76_csa_finish(&dev->mt76); 298 else 299 mt76_queue_kick(dev, dev->mt76.q_tx[MT_TXQ_PSD].q); 300 } 301 302 if (intr & MT_INT_TX_STAT) 303 mt76x02_mac_poll_tx_status(dev, true); 304 305 if (intr & (MT_INT_TX_STAT | MT_INT_TX_DONE_ALL)) { 306 mt76x02_irq_disable(dev, MT_INT_TX_DONE_ALL); 307 napi_schedule(&dev->mt76.tx_napi); 308 } 309 310 if (intr & MT_INT_GPTIMER) { 311 mt76x02_irq_disable(dev, MT_INT_GPTIMER); 312 tasklet_schedule(&dev->dfs_pd.dfs_tasklet); 313 } 314 315 return IRQ_HANDLED; 316 } 317 EXPORT_SYMBOL_GPL(mt76x02_irq_handler); 318 319 static void mt76x02_dma_enable(struct mt76x02_dev *dev) 320 { 321 u32 val; 322 323 mt76_wr(dev, MT_MAC_SYS_CTRL, MT_MAC_SYS_CTRL_ENABLE_TX); 324 mt76x02_wait_for_wpdma(&dev->mt76, 1000); 325 usleep_range(50, 100); 326 327 val = FIELD_PREP(MT_WPDMA_GLO_CFG_DMA_BURST_SIZE, 3) | 328 MT_WPDMA_GLO_CFG_TX_DMA_EN | 329 MT_WPDMA_GLO_CFG_RX_DMA_EN; 330 mt76_set(dev, MT_WPDMA_GLO_CFG, val); 331 mt76_clear(dev, MT_WPDMA_GLO_CFG, 332 MT_WPDMA_GLO_CFG_TX_WRITEBACK_DONE); 333 } 334 335 void mt76x02_dma_cleanup(struct mt76x02_dev *dev) 336 { 337 tasklet_kill(&dev->mt76.tx_tasklet); 338 mt76_dma_cleanup(&dev->mt76); 339 } 340 EXPORT_SYMBOL_GPL(mt76x02_dma_cleanup); 341 342 void mt76x02_dma_disable(struct mt76x02_dev *dev) 343 { 344 u32 val = mt76_rr(dev, MT_WPDMA_GLO_CFG); 345 346 val &= MT_WPDMA_GLO_CFG_DMA_BURST_SIZE | 347 MT_WPDMA_GLO_CFG_BIG_ENDIAN | 348 MT_WPDMA_GLO_CFG_HDR_SEG_LEN; 349 val |= MT_WPDMA_GLO_CFG_TX_WRITEBACK_DONE; 350 mt76_wr(dev, MT_WPDMA_GLO_CFG, val); 351 } 352 EXPORT_SYMBOL_GPL(mt76x02_dma_disable); 353 354 void mt76x02_mac_start(struct mt76x02_dev *dev) 355 { 356 mt76x02_dma_enable(dev); 357 mt76_wr(dev, MT_RX_FILTR_CFG, dev->mt76.rxfilter); 358 mt76_wr(dev, MT_MAC_SYS_CTRL, 359 MT_MAC_SYS_CTRL_ENABLE_TX | 360 MT_MAC_SYS_CTRL_ENABLE_RX); 361 mt76x02_irq_enable(dev, 362 MT_INT_RX_DONE_ALL | MT_INT_TX_DONE_ALL | 363 MT_INT_TX_STAT); 364 } 365 EXPORT_SYMBOL_GPL(mt76x02_mac_start); 366 367 static bool mt76x02_tx_hang(struct mt76x02_dev *dev) 368 { 369 u32 dma_idx, prev_dma_idx; 370 struct mt76_queue *q; 371 int i; 372 373 for (i = 0; i < 4; i++) { 374 q = dev->mt76.q_tx[i].q; 375 376 if (!q->queued) 377 continue; 378 379 prev_dma_idx = dev->mt76.tx_dma_idx[i]; 380 dma_idx = readl(&q->regs->dma_idx); 381 dev->mt76.tx_dma_idx[i] = dma_idx; 382 383 if (prev_dma_idx == dma_idx) 384 break; 385 } 386 387 return i < 4; 388 } 389 390 static void mt76x02_key_sync(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 391 struct ieee80211_sta *sta, 392 struct ieee80211_key_conf *key, void *data) 393 { 394 struct mt76x02_dev *dev = hw->priv; 395 struct mt76_wcid *wcid; 396 397 if (!sta) 398 return; 399 400 wcid = (struct mt76_wcid *) sta->drv_priv; 401 402 if (wcid->hw_key_idx != key->keyidx || wcid->sw_iv) 403 return; 404 405 mt76x02_mac_wcid_sync_pn(dev, wcid->idx, key); 406 } 407 408 static void mt76x02_reset_state(struct mt76x02_dev *dev) 409 { 410 int i; 411 412 lockdep_assert_held(&dev->mt76.mutex); 413 414 clear_bit(MT76_STATE_RUNNING, &dev->mt76.state); 415 416 rcu_read_lock(); 417 ieee80211_iter_keys_rcu(dev->mt76.hw, NULL, mt76x02_key_sync, NULL); 418 rcu_read_unlock(); 419 420 for (i = 0; i < ARRAY_SIZE(dev->mt76.wcid); i++) { 421 struct ieee80211_sta *sta; 422 struct ieee80211_vif *vif; 423 struct mt76x02_sta *msta; 424 struct mt76_wcid *wcid; 425 void *priv; 426 427 wcid = rcu_dereference_protected(dev->mt76.wcid[i], 428 lockdep_is_held(&dev->mt76.mutex)); 429 if (!wcid) 430 continue; 431 432 priv = msta = container_of(wcid, struct mt76x02_sta, wcid); 433 sta = container_of(priv, struct ieee80211_sta, drv_priv); 434 435 priv = msta->vif; 436 vif = container_of(priv, struct ieee80211_vif, drv_priv); 437 438 __mt76_sta_remove(&dev->mt76, vif, sta); 439 memset(msta, 0, sizeof(*msta)); 440 } 441 442 dev->vif_mask = 0; 443 dev->mt76.beacon_mask = 0; 444 } 445 446 static void mt76x02_watchdog_reset(struct mt76x02_dev *dev) 447 { 448 u32 mask = dev->mt76.mmio.irqmask; 449 bool restart = dev->mt76.mcu_ops->mcu_restart; 450 int i; 451 452 ieee80211_stop_queues(dev->mt76.hw); 453 set_bit(MT76_RESET, &dev->mt76.state); 454 455 tasklet_disable(&dev->mt76.pre_tbtt_tasklet); 456 tasklet_disable(&dev->mt76.tx_tasklet); 457 napi_disable(&dev->mt76.tx_napi); 458 459 for (i = 0; i < ARRAY_SIZE(dev->mt76.napi); i++) 460 napi_disable(&dev->mt76.napi[i]); 461 462 mutex_lock(&dev->mt76.mutex); 463 464 if (restart) 465 mt76x02_reset_state(dev); 466 467 if (dev->mt76.beacon_mask) 468 mt76_clear(dev, MT_BEACON_TIME_CFG, 469 MT_BEACON_TIME_CFG_BEACON_TX | 470 MT_BEACON_TIME_CFG_TBTT_EN); 471 472 mt76x02_irq_disable(dev, mask); 473 474 /* perform device reset */ 475 mt76_clear(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN); 476 mt76_wr(dev, MT_MAC_SYS_CTRL, 0); 477 mt76_clear(dev, MT_WPDMA_GLO_CFG, 478 MT_WPDMA_GLO_CFG_TX_DMA_EN | MT_WPDMA_GLO_CFG_RX_DMA_EN); 479 usleep_range(5000, 10000); 480 mt76_wr(dev, MT_INT_SOURCE_CSR, 0xffffffff); 481 482 /* let fw reset DMA */ 483 mt76_set(dev, 0x734, 0x3); 484 485 if (restart) 486 mt76_mcu_restart(dev); 487 488 for (i = 0; i < ARRAY_SIZE(dev->mt76.q_tx); i++) 489 mt76_queue_tx_cleanup(dev, i, true); 490 491 for (i = 0; i < ARRAY_SIZE(dev->mt76.q_rx); i++) 492 mt76_queue_rx_reset(dev, i); 493 494 mt76x02_mac_start(dev); 495 496 if (dev->ed_monitor) 497 mt76_set(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN); 498 499 if (dev->mt76.beacon_mask && !restart) 500 mt76_set(dev, MT_BEACON_TIME_CFG, 501 MT_BEACON_TIME_CFG_BEACON_TX | 502 MT_BEACON_TIME_CFG_TBTT_EN); 503 504 mt76x02_irq_enable(dev, mask); 505 506 mutex_unlock(&dev->mt76.mutex); 507 508 clear_bit(MT76_RESET, &dev->mt76.state); 509 510 tasklet_enable(&dev->mt76.tx_tasklet); 511 napi_enable(&dev->mt76.tx_napi); 512 napi_schedule(&dev->mt76.tx_napi); 513 514 tasklet_enable(&dev->mt76.pre_tbtt_tasklet); 515 516 for (i = 0; i < ARRAY_SIZE(dev->mt76.napi); i++) { 517 napi_enable(&dev->mt76.napi[i]); 518 napi_schedule(&dev->mt76.napi[i]); 519 } 520 521 if (restart) { 522 mt76x02_mcu_function_select(dev, Q_SELECT, 1); 523 ieee80211_restart_hw(dev->mt76.hw); 524 } else { 525 ieee80211_wake_queues(dev->mt76.hw); 526 mt76_txq_schedule_all(&dev->mt76); 527 } 528 } 529 530 static void mt76x02_check_tx_hang(struct mt76x02_dev *dev) 531 { 532 if (mt76x02_tx_hang(dev)) { 533 if (++dev->tx_hang_check >= MT_TX_HANG_TH) 534 goto restart; 535 } else { 536 dev->tx_hang_check = 0; 537 } 538 539 if (dev->mcu_timeout) 540 goto restart; 541 542 return; 543 544 restart: 545 mt76x02_watchdog_reset(dev); 546 547 mutex_lock(&dev->mt76.mmio.mcu.mutex); 548 dev->mcu_timeout = 0; 549 mutex_unlock(&dev->mt76.mmio.mcu.mutex); 550 551 dev->tx_hang_reset++; 552 dev->tx_hang_check = 0; 553 memset(dev->mt76.tx_dma_idx, 0xff, 554 sizeof(dev->mt76.tx_dma_idx)); 555 } 556 557 void mt76x02_wdt_work(struct work_struct *work) 558 { 559 struct mt76x02_dev *dev = container_of(work, struct mt76x02_dev, 560 wdt_work.work); 561 562 mt76x02_check_tx_hang(dev); 563 564 ieee80211_queue_delayed_work(mt76_hw(dev), &dev->wdt_work, 565 MT_WATCHDOG_TIME); 566 } 567