1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Bluetooth Software UART Qualcomm protocol 4 * 5 * HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management 6 * protocol extension to H4. 7 * 8 * Copyright (C) 2007 Texas Instruments, Inc. 9 * Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved. 10 * 11 * Acknowledgements: 12 * This file is based on hci_ll.c, which was... 13 * Written by Ohad Ben-Cohen <ohad@bencohen.org> 14 * which was in turn based on hci_h4.c, which was written 15 * by Maxim Krasnyansky and Marcel Holtmann. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/clk.h> 20 #include <linux/completion.h> 21 #include <linux/debugfs.h> 22 #include <linux/delay.h> 23 #include <linux/device.h> 24 #include <linux/gpio/consumer.h> 25 #include <linux/mod_devicetable.h> 26 #include <linux/module.h> 27 #include <linux/of_device.h> 28 #include <linux/platform_device.h> 29 #include <linux/regulator/consumer.h> 30 #include <linux/serdev.h> 31 #include <asm/unaligned.h> 32 33 #include <net/bluetooth/bluetooth.h> 34 #include <net/bluetooth/hci_core.h> 35 36 #include "hci_uart.h" 37 #include "btqca.h" 38 39 /* HCI_IBS protocol messages */ 40 #define HCI_IBS_SLEEP_IND 0xFE 41 #define HCI_IBS_WAKE_IND 0xFD 42 #define HCI_IBS_WAKE_ACK 0xFC 43 #define HCI_MAX_IBS_SIZE 10 44 45 #define IBS_WAKE_RETRANS_TIMEOUT_MS 100 46 #define IBS_BTSOC_TX_IDLE_TIMEOUT_MS 40 47 #define IBS_HOST_TX_IDLE_TIMEOUT_MS 2000 48 #define CMD_TRANS_TIMEOUT_MS 100 49 50 /* susclk rate */ 51 #define SUSCLK_RATE_32KHZ 32768 52 53 /* Controller debug log header */ 54 #define QCA_DEBUG_HANDLE 0x2EDC 55 56 enum qca_flags { 57 QCA_IBS_ENABLED, 58 QCA_DROP_VENDOR_EVENT, 59 QCA_SUSPENDING, 60 }; 61 62 /* HCI_IBS transmit side sleep protocol states */ 63 enum tx_ibs_states { 64 HCI_IBS_TX_ASLEEP, 65 HCI_IBS_TX_WAKING, 66 HCI_IBS_TX_AWAKE, 67 }; 68 69 /* HCI_IBS receive side sleep protocol states */ 70 enum rx_states { 71 HCI_IBS_RX_ASLEEP, 72 HCI_IBS_RX_AWAKE, 73 }; 74 75 /* HCI_IBS transmit and receive side clock state vote */ 76 enum hci_ibs_clock_state_vote { 77 HCI_IBS_VOTE_STATS_UPDATE, 78 HCI_IBS_TX_VOTE_CLOCK_ON, 79 HCI_IBS_TX_VOTE_CLOCK_OFF, 80 HCI_IBS_RX_VOTE_CLOCK_ON, 81 HCI_IBS_RX_VOTE_CLOCK_OFF, 82 }; 83 84 struct qca_data { 85 struct hci_uart *hu; 86 struct sk_buff *rx_skb; 87 struct sk_buff_head txq; 88 struct sk_buff_head tx_wait_q; /* HCI_IBS wait queue */ 89 spinlock_t hci_ibs_lock; /* HCI_IBS state lock */ 90 u8 tx_ibs_state; /* HCI_IBS transmit side power state*/ 91 u8 rx_ibs_state; /* HCI_IBS receive side power state */ 92 bool tx_vote; /* Clock must be on for TX */ 93 bool rx_vote; /* Clock must be on for RX */ 94 struct timer_list tx_idle_timer; 95 u32 tx_idle_delay; 96 struct timer_list wake_retrans_timer; 97 u32 wake_retrans; 98 struct workqueue_struct *workqueue; 99 struct work_struct ws_awake_rx; 100 struct work_struct ws_awake_device; 101 struct work_struct ws_rx_vote_off; 102 struct work_struct ws_tx_vote_off; 103 unsigned long flags; 104 struct completion drop_ev_comp; 105 wait_queue_head_t suspend_wait_q; 106 107 /* For debugging purpose */ 108 u64 ibs_sent_wacks; 109 u64 ibs_sent_slps; 110 u64 ibs_sent_wakes; 111 u64 ibs_recv_wacks; 112 u64 ibs_recv_slps; 113 u64 ibs_recv_wakes; 114 u64 vote_last_jif; 115 u32 vote_on_ms; 116 u32 vote_off_ms; 117 u64 tx_votes_on; 118 u64 rx_votes_on; 119 u64 tx_votes_off; 120 u64 rx_votes_off; 121 u64 votes_on; 122 u64 votes_off; 123 }; 124 125 enum qca_speed_type { 126 QCA_INIT_SPEED = 1, 127 QCA_OPER_SPEED 128 }; 129 130 /* 131 * Voltage regulator information required for configuring the 132 * QCA Bluetooth chipset 133 */ 134 struct qca_vreg { 135 const char *name; 136 unsigned int load_uA; 137 }; 138 139 struct qca_vreg_data { 140 enum qca_btsoc_type soc_type; 141 struct qca_vreg *vregs; 142 size_t num_vregs; 143 }; 144 145 /* 146 * Platform data for the QCA Bluetooth power driver. 147 */ 148 struct qca_power { 149 struct device *dev; 150 struct regulator_bulk_data *vreg_bulk; 151 int num_vregs; 152 bool vregs_on; 153 }; 154 155 struct qca_serdev { 156 struct hci_uart serdev_hu; 157 struct gpio_desc *bt_en; 158 struct clk *susclk; 159 enum qca_btsoc_type btsoc_type; 160 struct qca_power *bt_power; 161 u32 init_speed; 162 u32 oper_speed; 163 const char *firmware_name; 164 }; 165 166 static int qca_regulator_enable(struct qca_serdev *qcadev); 167 static void qca_regulator_disable(struct qca_serdev *qcadev); 168 static void qca_power_shutdown(struct hci_uart *hu); 169 static int qca_power_off(struct hci_dev *hdev); 170 171 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu) 172 { 173 enum qca_btsoc_type soc_type; 174 175 if (hu->serdev) { 176 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev); 177 178 soc_type = qsd->btsoc_type; 179 } else { 180 soc_type = QCA_ROME; 181 } 182 183 return soc_type; 184 } 185 186 static const char *qca_get_firmware_name(struct hci_uart *hu) 187 { 188 if (hu->serdev) { 189 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev); 190 191 return qsd->firmware_name; 192 } else { 193 return NULL; 194 } 195 } 196 197 static void __serial_clock_on(struct tty_struct *tty) 198 { 199 /* TODO: Some chipset requires to enable UART clock on client 200 * side to save power consumption or manual work is required. 201 * Please put your code to control UART clock here if needed 202 */ 203 } 204 205 static void __serial_clock_off(struct tty_struct *tty) 206 { 207 /* TODO: Some chipset requires to disable UART clock on client 208 * side to save power consumption or manual work is required. 209 * Please put your code to control UART clock off here if needed 210 */ 211 } 212 213 /* serial_clock_vote needs to be called with the ibs lock held */ 214 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu) 215 { 216 struct qca_data *qca = hu->priv; 217 unsigned int diff; 218 219 bool old_vote = (qca->tx_vote | qca->rx_vote); 220 bool new_vote; 221 222 switch (vote) { 223 case HCI_IBS_VOTE_STATS_UPDATE: 224 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif); 225 226 if (old_vote) 227 qca->vote_off_ms += diff; 228 else 229 qca->vote_on_ms += diff; 230 return; 231 232 case HCI_IBS_TX_VOTE_CLOCK_ON: 233 qca->tx_vote = true; 234 qca->tx_votes_on++; 235 new_vote = true; 236 break; 237 238 case HCI_IBS_RX_VOTE_CLOCK_ON: 239 qca->rx_vote = true; 240 qca->rx_votes_on++; 241 new_vote = true; 242 break; 243 244 case HCI_IBS_TX_VOTE_CLOCK_OFF: 245 qca->tx_vote = false; 246 qca->tx_votes_off++; 247 new_vote = qca->rx_vote | qca->tx_vote; 248 break; 249 250 case HCI_IBS_RX_VOTE_CLOCK_OFF: 251 qca->rx_vote = false; 252 qca->rx_votes_off++; 253 new_vote = qca->rx_vote | qca->tx_vote; 254 break; 255 256 default: 257 BT_ERR("Voting irregularity"); 258 return; 259 } 260 261 if (new_vote != old_vote) { 262 if (new_vote) 263 __serial_clock_on(hu->tty); 264 else 265 __serial_clock_off(hu->tty); 266 267 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false", 268 vote ? "true" : "false"); 269 270 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif); 271 272 if (new_vote) { 273 qca->votes_on++; 274 qca->vote_off_ms += diff; 275 } else { 276 qca->votes_off++; 277 qca->vote_on_ms += diff; 278 } 279 qca->vote_last_jif = jiffies; 280 } 281 } 282 283 /* Builds and sends an HCI_IBS command packet. 284 * These are very simple packets with only 1 cmd byte. 285 */ 286 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu) 287 { 288 int err = 0; 289 struct sk_buff *skb = NULL; 290 struct qca_data *qca = hu->priv; 291 292 BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd); 293 294 skb = bt_skb_alloc(1, GFP_ATOMIC); 295 if (!skb) { 296 BT_ERR("Failed to allocate memory for HCI_IBS packet"); 297 return -ENOMEM; 298 } 299 300 /* Assign HCI_IBS type */ 301 skb_put_u8(skb, cmd); 302 303 skb_queue_tail(&qca->txq, skb); 304 305 return err; 306 } 307 308 static void qca_wq_awake_device(struct work_struct *work) 309 { 310 struct qca_data *qca = container_of(work, struct qca_data, 311 ws_awake_device); 312 struct hci_uart *hu = qca->hu; 313 unsigned long retrans_delay; 314 unsigned long flags; 315 316 BT_DBG("hu %p wq awake device", hu); 317 318 /* Vote for serial clock */ 319 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu); 320 321 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 322 323 /* Send wake indication to device */ 324 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) 325 BT_ERR("Failed to send WAKE to device"); 326 327 qca->ibs_sent_wakes++; 328 329 /* Start retransmit timer */ 330 retrans_delay = msecs_to_jiffies(qca->wake_retrans); 331 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); 332 333 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 334 335 /* Actually send the packets */ 336 hci_uart_tx_wakeup(hu); 337 } 338 339 static void qca_wq_awake_rx(struct work_struct *work) 340 { 341 struct qca_data *qca = container_of(work, struct qca_data, 342 ws_awake_rx); 343 struct hci_uart *hu = qca->hu; 344 unsigned long flags; 345 346 BT_DBG("hu %p wq awake rx", hu); 347 348 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu); 349 350 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 351 qca->rx_ibs_state = HCI_IBS_RX_AWAKE; 352 353 /* Always acknowledge device wake up, 354 * sending IBS message doesn't count as TX ON. 355 */ 356 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) 357 BT_ERR("Failed to acknowledge device wake up"); 358 359 qca->ibs_sent_wacks++; 360 361 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 362 363 /* Actually send the packets */ 364 hci_uart_tx_wakeup(hu); 365 } 366 367 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work) 368 { 369 struct qca_data *qca = container_of(work, struct qca_data, 370 ws_rx_vote_off); 371 struct hci_uart *hu = qca->hu; 372 373 BT_DBG("hu %p rx clock vote off", hu); 374 375 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu); 376 } 377 378 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work) 379 { 380 struct qca_data *qca = container_of(work, struct qca_data, 381 ws_tx_vote_off); 382 struct hci_uart *hu = qca->hu; 383 384 BT_DBG("hu %p tx clock vote off", hu); 385 386 /* Run HCI tx handling unlocked */ 387 hci_uart_tx_wakeup(hu); 388 389 /* Now that message queued to tty driver, vote for tty clocks off. 390 * It is up to the tty driver to pend the clocks off until tx done. 391 */ 392 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu); 393 } 394 395 static void hci_ibs_tx_idle_timeout(struct timer_list *t) 396 { 397 struct qca_data *qca = from_timer(qca, t, tx_idle_timer); 398 struct hci_uart *hu = qca->hu; 399 unsigned long flags; 400 401 BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state); 402 403 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 404 flags, SINGLE_DEPTH_NESTING); 405 406 switch (qca->tx_ibs_state) { 407 case HCI_IBS_TX_AWAKE: 408 /* TX_IDLE, go to SLEEP */ 409 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) { 410 BT_ERR("Failed to send SLEEP to device"); 411 break; 412 } 413 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 414 qca->ibs_sent_slps++; 415 queue_work(qca->workqueue, &qca->ws_tx_vote_off); 416 break; 417 418 case HCI_IBS_TX_ASLEEP: 419 case HCI_IBS_TX_WAKING: 420 /* Fall through */ 421 422 default: 423 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state); 424 break; 425 } 426 427 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 428 } 429 430 static void hci_ibs_wake_retrans_timeout(struct timer_list *t) 431 { 432 struct qca_data *qca = from_timer(qca, t, wake_retrans_timer); 433 struct hci_uart *hu = qca->hu; 434 unsigned long flags, retrans_delay; 435 bool retransmit = false; 436 437 BT_DBG("hu %p wake retransmit timeout in %d state", 438 hu, qca->tx_ibs_state); 439 440 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 441 flags, SINGLE_DEPTH_NESTING); 442 443 /* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */ 444 if (test_bit(QCA_SUSPENDING, &qca->flags)) { 445 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 446 return; 447 } 448 449 switch (qca->tx_ibs_state) { 450 case HCI_IBS_TX_WAKING: 451 /* No WAKE_ACK, retransmit WAKE */ 452 retransmit = true; 453 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) { 454 BT_ERR("Failed to acknowledge device wake up"); 455 break; 456 } 457 qca->ibs_sent_wakes++; 458 retrans_delay = msecs_to_jiffies(qca->wake_retrans); 459 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); 460 break; 461 462 case HCI_IBS_TX_ASLEEP: 463 case HCI_IBS_TX_AWAKE: 464 /* Fall through */ 465 466 default: 467 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state); 468 break; 469 } 470 471 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 472 473 if (retransmit) 474 hci_uart_tx_wakeup(hu); 475 } 476 477 /* Initialize protocol */ 478 static int qca_open(struct hci_uart *hu) 479 { 480 struct qca_serdev *qcadev; 481 struct qca_data *qca; 482 int ret; 483 484 BT_DBG("hu %p qca_open", hu); 485 486 if (!hci_uart_has_flow_control(hu)) 487 return -EOPNOTSUPP; 488 489 qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL); 490 if (!qca) 491 return -ENOMEM; 492 493 skb_queue_head_init(&qca->txq); 494 skb_queue_head_init(&qca->tx_wait_q); 495 spin_lock_init(&qca->hci_ibs_lock); 496 qca->workqueue = alloc_ordered_workqueue("qca_wq", 0); 497 if (!qca->workqueue) { 498 BT_ERR("QCA Workqueue not initialized properly"); 499 kfree(qca); 500 return -ENOMEM; 501 } 502 503 INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx); 504 INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device); 505 INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off); 506 INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off); 507 508 init_waitqueue_head(&qca->suspend_wait_q); 509 510 qca->hu = hu; 511 init_completion(&qca->drop_ev_comp); 512 513 /* Assume we start with both sides asleep -- extra wakes OK */ 514 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 515 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; 516 517 qca->vote_last_jif = jiffies; 518 519 hu->priv = qca; 520 521 if (hu->serdev) { 522 523 qcadev = serdev_device_get_drvdata(hu->serdev); 524 if (!qca_is_wcn399x(qcadev->btsoc_type)) { 525 gpiod_set_value_cansleep(qcadev->bt_en, 1); 526 /* Controller needs time to bootup. */ 527 msleep(150); 528 } else { 529 hu->init_speed = qcadev->init_speed; 530 hu->oper_speed = qcadev->oper_speed; 531 ret = qca_regulator_enable(qcadev); 532 if (ret) { 533 destroy_workqueue(qca->workqueue); 534 kfree_skb(qca->rx_skb); 535 hu->priv = NULL; 536 kfree(qca); 537 return ret; 538 } 539 } 540 } 541 542 timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0); 543 qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS; 544 545 timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0); 546 qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS; 547 548 BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u", 549 qca->tx_idle_delay, qca->wake_retrans); 550 551 return 0; 552 } 553 554 static void qca_debugfs_init(struct hci_dev *hdev) 555 { 556 struct hci_uart *hu = hci_get_drvdata(hdev); 557 struct qca_data *qca = hu->priv; 558 struct dentry *ibs_dir; 559 umode_t mode; 560 561 if (!hdev->debugfs) 562 return; 563 564 ibs_dir = debugfs_create_dir("ibs", hdev->debugfs); 565 566 /* read only */ 567 mode = S_IRUGO; 568 debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state); 569 debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state); 570 debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir, 571 &qca->ibs_sent_slps); 572 debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir, 573 &qca->ibs_sent_wakes); 574 debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir, 575 &qca->ibs_sent_wacks); 576 debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir, 577 &qca->ibs_recv_slps); 578 debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir, 579 &qca->ibs_recv_wakes); 580 debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir, 581 &qca->ibs_recv_wacks); 582 debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote); 583 debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on); 584 debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off); 585 debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote); 586 debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on); 587 debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off); 588 debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on); 589 debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off); 590 debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms); 591 debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms); 592 593 /* read/write */ 594 mode = S_IRUGO | S_IWUSR; 595 debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans); 596 debugfs_create_u32("tx_idle_delay", mode, ibs_dir, 597 &qca->tx_idle_delay); 598 } 599 600 /* Flush protocol data */ 601 static int qca_flush(struct hci_uart *hu) 602 { 603 struct qca_data *qca = hu->priv; 604 605 BT_DBG("hu %p qca flush", hu); 606 607 skb_queue_purge(&qca->tx_wait_q); 608 skb_queue_purge(&qca->txq); 609 610 return 0; 611 } 612 613 /* Close protocol */ 614 static int qca_close(struct hci_uart *hu) 615 { 616 struct qca_serdev *qcadev; 617 struct qca_data *qca = hu->priv; 618 619 BT_DBG("hu %p qca close", hu); 620 621 serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu); 622 623 skb_queue_purge(&qca->tx_wait_q); 624 skb_queue_purge(&qca->txq); 625 del_timer(&qca->tx_idle_timer); 626 del_timer(&qca->wake_retrans_timer); 627 destroy_workqueue(qca->workqueue); 628 qca->hu = NULL; 629 630 if (hu->serdev) { 631 qcadev = serdev_device_get_drvdata(hu->serdev); 632 if (qca_is_wcn399x(qcadev->btsoc_type)) 633 qca_power_shutdown(hu); 634 else 635 gpiod_set_value_cansleep(qcadev->bt_en, 0); 636 637 } 638 639 kfree_skb(qca->rx_skb); 640 641 hu->priv = NULL; 642 643 kfree(qca); 644 645 return 0; 646 } 647 648 /* Called upon a wake-up-indication from the device. 649 */ 650 static void device_want_to_wakeup(struct hci_uart *hu) 651 { 652 unsigned long flags; 653 struct qca_data *qca = hu->priv; 654 655 BT_DBG("hu %p want to wake up", hu); 656 657 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 658 659 qca->ibs_recv_wakes++; 660 661 /* Don't wake the rx up when suspending. */ 662 if (test_bit(QCA_SUSPENDING, &qca->flags)) { 663 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 664 return; 665 } 666 667 switch (qca->rx_ibs_state) { 668 case HCI_IBS_RX_ASLEEP: 669 /* Make sure clock is on - we may have turned clock off since 670 * receiving the wake up indicator awake rx clock. 671 */ 672 queue_work(qca->workqueue, &qca->ws_awake_rx); 673 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 674 return; 675 676 case HCI_IBS_RX_AWAKE: 677 /* Always acknowledge device wake up, 678 * sending IBS message doesn't count as TX ON. 679 */ 680 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) { 681 BT_ERR("Failed to acknowledge device wake up"); 682 break; 683 } 684 qca->ibs_sent_wacks++; 685 break; 686 687 default: 688 /* Any other state is illegal */ 689 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d", 690 qca->rx_ibs_state); 691 break; 692 } 693 694 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 695 696 /* Actually send the packets */ 697 hci_uart_tx_wakeup(hu); 698 } 699 700 /* Called upon a sleep-indication from the device. 701 */ 702 static void device_want_to_sleep(struct hci_uart *hu) 703 { 704 unsigned long flags; 705 struct qca_data *qca = hu->priv; 706 707 BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state); 708 709 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 710 711 qca->ibs_recv_slps++; 712 713 switch (qca->rx_ibs_state) { 714 case HCI_IBS_RX_AWAKE: 715 /* Update state */ 716 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; 717 /* Vote off rx clock under workqueue */ 718 queue_work(qca->workqueue, &qca->ws_rx_vote_off); 719 break; 720 721 case HCI_IBS_RX_ASLEEP: 722 break; 723 724 default: 725 /* Any other state is illegal */ 726 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d", 727 qca->rx_ibs_state); 728 break; 729 } 730 731 wake_up_interruptible(&qca->suspend_wait_q); 732 733 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 734 } 735 736 /* Called upon wake-up-acknowledgement from the device 737 */ 738 static void device_woke_up(struct hci_uart *hu) 739 { 740 unsigned long flags, idle_delay; 741 struct qca_data *qca = hu->priv; 742 struct sk_buff *skb = NULL; 743 744 BT_DBG("hu %p woke up", hu); 745 746 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 747 748 qca->ibs_recv_wacks++; 749 750 /* Don't react to the wake-up-acknowledgment when suspending. */ 751 if (test_bit(QCA_SUSPENDING, &qca->flags)) { 752 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 753 return; 754 } 755 756 switch (qca->tx_ibs_state) { 757 case HCI_IBS_TX_AWAKE: 758 /* Expect one if we send 2 WAKEs */ 759 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d", 760 qca->tx_ibs_state); 761 break; 762 763 case HCI_IBS_TX_WAKING: 764 /* Send pending packets */ 765 while ((skb = skb_dequeue(&qca->tx_wait_q))) 766 skb_queue_tail(&qca->txq, skb); 767 768 /* Switch timers and change state to HCI_IBS_TX_AWAKE */ 769 del_timer(&qca->wake_retrans_timer); 770 idle_delay = msecs_to_jiffies(qca->tx_idle_delay); 771 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); 772 qca->tx_ibs_state = HCI_IBS_TX_AWAKE; 773 break; 774 775 case HCI_IBS_TX_ASLEEP: 776 /* Fall through */ 777 778 default: 779 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d", 780 qca->tx_ibs_state); 781 break; 782 } 783 784 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 785 786 /* Actually send the packets */ 787 hci_uart_tx_wakeup(hu); 788 } 789 790 /* Enqueue frame for transmittion (padding, crc, etc) may be called from 791 * two simultaneous tasklets. 792 */ 793 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb) 794 { 795 unsigned long flags = 0, idle_delay; 796 struct qca_data *qca = hu->priv; 797 798 BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb, 799 qca->tx_ibs_state); 800 801 /* Prepend skb with frame type */ 802 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 803 804 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 805 806 /* Don't go to sleep in middle of patch download or 807 * Out-Of-Band(GPIOs control) sleep is selected. 808 * Don't wake the device up when suspending. 809 */ 810 if (!test_bit(QCA_IBS_ENABLED, &qca->flags) || 811 test_bit(QCA_SUSPENDING, &qca->flags)) { 812 skb_queue_tail(&qca->txq, skb); 813 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 814 return 0; 815 } 816 817 /* Act according to current state */ 818 switch (qca->tx_ibs_state) { 819 case HCI_IBS_TX_AWAKE: 820 BT_DBG("Device awake, sending normally"); 821 skb_queue_tail(&qca->txq, skb); 822 idle_delay = msecs_to_jiffies(qca->tx_idle_delay); 823 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); 824 break; 825 826 case HCI_IBS_TX_ASLEEP: 827 BT_DBG("Device asleep, waking up and queueing packet"); 828 /* Save packet for later */ 829 skb_queue_tail(&qca->tx_wait_q, skb); 830 831 qca->tx_ibs_state = HCI_IBS_TX_WAKING; 832 /* Schedule a work queue to wake up device */ 833 queue_work(qca->workqueue, &qca->ws_awake_device); 834 break; 835 836 case HCI_IBS_TX_WAKING: 837 BT_DBG("Device waking up, queueing packet"); 838 /* Transient state; just keep packet for later */ 839 skb_queue_tail(&qca->tx_wait_q, skb); 840 break; 841 842 default: 843 BT_ERR("Illegal tx state: %d (losing packet)", 844 qca->tx_ibs_state); 845 kfree_skb(skb); 846 break; 847 } 848 849 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 850 851 return 0; 852 } 853 854 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb) 855 { 856 struct hci_uart *hu = hci_get_drvdata(hdev); 857 858 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND); 859 860 device_want_to_sleep(hu); 861 862 kfree_skb(skb); 863 return 0; 864 } 865 866 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb) 867 { 868 struct hci_uart *hu = hci_get_drvdata(hdev); 869 870 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND); 871 872 device_want_to_wakeup(hu); 873 874 kfree_skb(skb); 875 return 0; 876 } 877 878 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb) 879 { 880 struct hci_uart *hu = hci_get_drvdata(hdev); 881 882 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK); 883 884 device_woke_up(hu); 885 886 kfree_skb(skb); 887 return 0; 888 } 889 890 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb) 891 { 892 /* We receive debug logs from chip as an ACL packets. 893 * Instead of sending the data to ACL to decode the 894 * received data, we are pushing them to the above layers 895 * as a diagnostic packet. 896 */ 897 if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE) 898 return hci_recv_diag(hdev, skb); 899 900 return hci_recv_frame(hdev, skb); 901 } 902 903 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb) 904 { 905 struct hci_uart *hu = hci_get_drvdata(hdev); 906 struct qca_data *qca = hu->priv; 907 908 if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) { 909 struct hci_event_hdr *hdr = (void *)skb->data; 910 911 /* For the WCN3990 the vendor command for a baudrate change 912 * isn't sent as synchronous HCI command, because the 913 * controller sends the corresponding vendor event with the 914 * new baudrate. The event is received and properly decoded 915 * after changing the baudrate of the host port. It needs to 916 * be dropped, otherwise it can be misinterpreted as 917 * response to a later firmware download command (also a 918 * vendor command). 919 */ 920 921 if (hdr->evt == HCI_EV_VENDOR) 922 complete(&qca->drop_ev_comp); 923 924 kfree_skb(skb); 925 926 return 0; 927 } 928 929 return hci_recv_frame(hdev, skb); 930 } 931 932 #define QCA_IBS_SLEEP_IND_EVENT \ 933 .type = HCI_IBS_SLEEP_IND, \ 934 .hlen = 0, \ 935 .loff = 0, \ 936 .lsize = 0, \ 937 .maxlen = HCI_MAX_IBS_SIZE 938 939 #define QCA_IBS_WAKE_IND_EVENT \ 940 .type = HCI_IBS_WAKE_IND, \ 941 .hlen = 0, \ 942 .loff = 0, \ 943 .lsize = 0, \ 944 .maxlen = HCI_MAX_IBS_SIZE 945 946 #define QCA_IBS_WAKE_ACK_EVENT \ 947 .type = HCI_IBS_WAKE_ACK, \ 948 .hlen = 0, \ 949 .loff = 0, \ 950 .lsize = 0, \ 951 .maxlen = HCI_MAX_IBS_SIZE 952 953 static const struct h4_recv_pkt qca_recv_pkts[] = { 954 { H4_RECV_ACL, .recv = qca_recv_acl_data }, 955 { H4_RECV_SCO, .recv = hci_recv_frame }, 956 { H4_RECV_EVENT, .recv = qca_recv_event }, 957 { QCA_IBS_WAKE_IND_EVENT, .recv = qca_ibs_wake_ind }, 958 { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_wake_ack }, 959 { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind }, 960 }; 961 962 static int qca_recv(struct hci_uart *hu, const void *data, int count) 963 { 964 struct qca_data *qca = hu->priv; 965 966 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 967 return -EUNATCH; 968 969 qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count, 970 qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts)); 971 if (IS_ERR(qca->rx_skb)) { 972 int err = PTR_ERR(qca->rx_skb); 973 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 974 qca->rx_skb = NULL; 975 return err; 976 } 977 978 return count; 979 } 980 981 static struct sk_buff *qca_dequeue(struct hci_uart *hu) 982 { 983 struct qca_data *qca = hu->priv; 984 985 return skb_dequeue(&qca->txq); 986 } 987 988 static uint8_t qca_get_baudrate_value(int speed) 989 { 990 switch (speed) { 991 case 9600: 992 return QCA_BAUDRATE_9600; 993 case 19200: 994 return QCA_BAUDRATE_19200; 995 case 38400: 996 return QCA_BAUDRATE_38400; 997 case 57600: 998 return QCA_BAUDRATE_57600; 999 case 115200: 1000 return QCA_BAUDRATE_115200; 1001 case 230400: 1002 return QCA_BAUDRATE_230400; 1003 case 460800: 1004 return QCA_BAUDRATE_460800; 1005 case 500000: 1006 return QCA_BAUDRATE_500000; 1007 case 921600: 1008 return QCA_BAUDRATE_921600; 1009 case 1000000: 1010 return QCA_BAUDRATE_1000000; 1011 case 2000000: 1012 return QCA_BAUDRATE_2000000; 1013 case 3000000: 1014 return QCA_BAUDRATE_3000000; 1015 case 3200000: 1016 return QCA_BAUDRATE_3200000; 1017 case 3500000: 1018 return QCA_BAUDRATE_3500000; 1019 default: 1020 return QCA_BAUDRATE_115200; 1021 } 1022 } 1023 1024 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) 1025 { 1026 struct hci_uart *hu = hci_get_drvdata(hdev); 1027 struct qca_data *qca = hu->priv; 1028 struct sk_buff *skb; 1029 u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 }; 1030 1031 if (baudrate > QCA_BAUDRATE_3200000) 1032 return -EINVAL; 1033 1034 cmd[4] = baudrate; 1035 1036 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL); 1037 if (!skb) { 1038 bt_dev_err(hdev, "Failed to allocate baudrate packet"); 1039 return -ENOMEM; 1040 } 1041 1042 /* Assign commands to change baudrate and packet type. */ 1043 skb_put_data(skb, cmd, sizeof(cmd)); 1044 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT; 1045 1046 skb_queue_tail(&qca->txq, skb); 1047 hci_uart_tx_wakeup(hu); 1048 1049 /* Wait for the baudrate change request to be sent */ 1050 1051 while (!skb_queue_empty(&qca->txq)) 1052 usleep_range(100, 200); 1053 1054 if (hu->serdev) 1055 serdev_device_wait_until_sent(hu->serdev, 1056 msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS)); 1057 1058 /* Give the controller time to process the request */ 1059 if (qca_is_wcn399x(qca_soc_type(hu))) 1060 msleep(10); 1061 else 1062 msleep(300); 1063 1064 return 0; 1065 } 1066 1067 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) 1068 { 1069 if (hu->serdev) 1070 serdev_device_set_baudrate(hu->serdev, speed); 1071 else 1072 hci_uart_set_baudrate(hu, speed); 1073 } 1074 1075 static int qca_send_power_pulse(struct hci_uart *hu, bool on) 1076 { 1077 int ret; 1078 int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS); 1079 u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE; 1080 1081 /* These power pulses are single byte command which are sent 1082 * at required baudrate to wcn3990. On wcn3990, we have an external 1083 * circuit at Tx pin which decodes the pulse sent at specific baudrate. 1084 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT 1085 * and also we use the same power inputs to turn on and off for 1086 * Wi-Fi/BT. Powering up the power sources will not enable BT, until 1087 * we send a power on pulse at 115200 bps. This algorithm will help to 1088 * save power. Disabling hardware flow control is mandatory while 1089 * sending power pulses to SoC. 1090 */ 1091 bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd); 1092 1093 serdev_device_write_flush(hu->serdev); 1094 hci_uart_set_flow_control(hu, true); 1095 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd)); 1096 if (ret < 0) { 1097 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd); 1098 return ret; 1099 } 1100 1101 serdev_device_wait_until_sent(hu->serdev, timeout); 1102 hci_uart_set_flow_control(hu, false); 1103 1104 /* Give to controller time to boot/shutdown */ 1105 if (on) 1106 msleep(100); 1107 else 1108 msleep(10); 1109 1110 return 0; 1111 } 1112 1113 static unsigned int qca_get_speed(struct hci_uart *hu, 1114 enum qca_speed_type speed_type) 1115 { 1116 unsigned int speed = 0; 1117 1118 if (speed_type == QCA_INIT_SPEED) { 1119 if (hu->init_speed) 1120 speed = hu->init_speed; 1121 else if (hu->proto->init_speed) 1122 speed = hu->proto->init_speed; 1123 } else { 1124 if (hu->oper_speed) 1125 speed = hu->oper_speed; 1126 else if (hu->proto->oper_speed) 1127 speed = hu->proto->oper_speed; 1128 } 1129 1130 return speed; 1131 } 1132 1133 static int qca_check_speeds(struct hci_uart *hu) 1134 { 1135 if (qca_is_wcn399x(qca_soc_type(hu))) { 1136 if (!qca_get_speed(hu, QCA_INIT_SPEED) && 1137 !qca_get_speed(hu, QCA_OPER_SPEED)) 1138 return -EINVAL; 1139 } else { 1140 if (!qca_get_speed(hu, QCA_INIT_SPEED) || 1141 !qca_get_speed(hu, QCA_OPER_SPEED)) 1142 return -EINVAL; 1143 } 1144 1145 return 0; 1146 } 1147 1148 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type) 1149 { 1150 unsigned int speed, qca_baudrate; 1151 struct qca_data *qca = hu->priv; 1152 int ret = 0; 1153 1154 if (speed_type == QCA_INIT_SPEED) { 1155 speed = qca_get_speed(hu, QCA_INIT_SPEED); 1156 if (speed) 1157 host_set_baudrate(hu, speed); 1158 } else { 1159 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1160 1161 speed = qca_get_speed(hu, QCA_OPER_SPEED); 1162 if (!speed) 1163 return 0; 1164 1165 /* Disable flow control for wcn3990 to deassert RTS while 1166 * changing the baudrate of chip and host. 1167 */ 1168 if (qca_is_wcn399x(soc_type)) 1169 hci_uart_set_flow_control(hu, true); 1170 1171 if (soc_type == QCA_WCN3990) { 1172 reinit_completion(&qca->drop_ev_comp); 1173 set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags); 1174 } 1175 1176 qca_baudrate = qca_get_baudrate_value(speed); 1177 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed); 1178 ret = qca_set_baudrate(hu->hdev, qca_baudrate); 1179 if (ret) 1180 goto error; 1181 1182 host_set_baudrate(hu, speed); 1183 1184 error: 1185 if (qca_is_wcn399x(soc_type)) 1186 hci_uart_set_flow_control(hu, false); 1187 1188 if (soc_type == QCA_WCN3990) { 1189 /* Wait for the controller to send the vendor event 1190 * for the baudrate change command. 1191 */ 1192 if (!wait_for_completion_timeout(&qca->drop_ev_comp, 1193 msecs_to_jiffies(100))) { 1194 bt_dev_err(hu->hdev, 1195 "Failed to change controller baudrate\n"); 1196 ret = -ETIMEDOUT; 1197 } 1198 1199 clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags); 1200 } 1201 } 1202 1203 return ret; 1204 } 1205 1206 static int qca_wcn3990_init(struct hci_uart *hu) 1207 { 1208 struct qca_serdev *qcadev; 1209 int ret; 1210 1211 /* Check for vregs status, may be hci down has turned 1212 * off the voltage regulator. 1213 */ 1214 qcadev = serdev_device_get_drvdata(hu->serdev); 1215 if (!qcadev->bt_power->vregs_on) { 1216 serdev_device_close(hu->serdev); 1217 ret = qca_regulator_enable(qcadev); 1218 if (ret) 1219 return ret; 1220 1221 ret = serdev_device_open(hu->serdev); 1222 if (ret) { 1223 bt_dev_err(hu->hdev, "failed to open port"); 1224 return ret; 1225 } 1226 } 1227 1228 /* Forcefully enable wcn3990 to enter in to boot mode. */ 1229 host_set_baudrate(hu, 2400); 1230 ret = qca_send_power_pulse(hu, false); 1231 if (ret) 1232 return ret; 1233 1234 qca_set_speed(hu, QCA_INIT_SPEED); 1235 ret = qca_send_power_pulse(hu, true); 1236 if (ret) 1237 return ret; 1238 1239 /* Now the device is in ready state to communicate with host. 1240 * To sync host with device we need to reopen port. 1241 * Without this, we will have RTS and CTS synchronization 1242 * issues. 1243 */ 1244 serdev_device_close(hu->serdev); 1245 ret = serdev_device_open(hu->serdev); 1246 if (ret) { 1247 bt_dev_err(hu->hdev, "failed to open port"); 1248 return ret; 1249 } 1250 1251 hci_uart_set_flow_control(hu, false); 1252 1253 return 0; 1254 } 1255 1256 static int qca_setup(struct hci_uart *hu) 1257 { 1258 struct hci_dev *hdev = hu->hdev; 1259 struct qca_data *qca = hu->priv; 1260 unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200; 1261 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1262 const char *firmware_name = qca_get_firmware_name(hu); 1263 int ret; 1264 int soc_ver = 0; 1265 1266 ret = qca_check_speeds(hu); 1267 if (ret) 1268 return ret; 1269 1270 /* Patch downloading has to be done without IBS mode */ 1271 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1272 1273 /* Enable controller to do both LE scan and BR/EDR inquiry 1274 * simultaneously. 1275 */ 1276 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); 1277 1278 if (qca_is_wcn399x(soc_type)) { 1279 bt_dev_info(hdev, "setting up wcn3990"); 1280 1281 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute 1282 * setup for every hci up. 1283 */ 1284 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); 1285 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks); 1286 hu->hdev->shutdown = qca_power_off; 1287 ret = qca_wcn3990_init(hu); 1288 if (ret) 1289 return ret; 1290 1291 ret = qca_read_soc_version(hdev, &soc_ver, soc_type); 1292 if (ret) 1293 return ret; 1294 } else { 1295 bt_dev_info(hdev, "ROME setup"); 1296 qca_set_speed(hu, QCA_INIT_SPEED); 1297 } 1298 1299 /* Setup user speed if needed */ 1300 speed = qca_get_speed(hu, QCA_OPER_SPEED); 1301 if (speed) { 1302 ret = qca_set_speed(hu, QCA_OPER_SPEED); 1303 if (ret) 1304 return ret; 1305 1306 qca_baudrate = qca_get_baudrate_value(speed); 1307 } 1308 1309 if (!qca_is_wcn399x(soc_type)) { 1310 /* Get QCA version information */ 1311 ret = qca_read_soc_version(hdev, &soc_ver, soc_type); 1312 if (ret) 1313 return ret; 1314 } 1315 1316 bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver); 1317 /* Setup patch / NVM configurations */ 1318 ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver, 1319 firmware_name); 1320 if (!ret) { 1321 set_bit(QCA_IBS_ENABLED, &qca->flags); 1322 qca_debugfs_init(hdev); 1323 } else if (ret == -ENOENT) { 1324 /* No patch/nvm-config found, run with original fw/config */ 1325 ret = 0; 1326 } else if (ret == -EAGAIN) { 1327 /* 1328 * Userspace firmware loader will return -EAGAIN in case no 1329 * patch/nvm-config is found, so run with original fw/config. 1330 */ 1331 ret = 0; 1332 } 1333 1334 /* Setup bdaddr */ 1335 if (qca_is_wcn399x(soc_type)) 1336 hu->hdev->set_bdaddr = qca_set_bdaddr; 1337 else 1338 hu->hdev->set_bdaddr = qca_set_bdaddr_rome; 1339 1340 return ret; 1341 } 1342 1343 static const struct hci_uart_proto qca_proto = { 1344 .id = HCI_UART_QCA, 1345 .name = "QCA", 1346 .manufacturer = 29, 1347 .init_speed = 115200, 1348 .oper_speed = 3000000, 1349 .open = qca_open, 1350 .close = qca_close, 1351 .flush = qca_flush, 1352 .setup = qca_setup, 1353 .recv = qca_recv, 1354 .enqueue = qca_enqueue, 1355 .dequeue = qca_dequeue, 1356 }; 1357 1358 static const struct qca_vreg_data qca_soc_data_wcn3990 = { 1359 .soc_type = QCA_WCN3990, 1360 .vregs = (struct qca_vreg []) { 1361 { "vddio", 15000 }, 1362 { "vddxo", 80000 }, 1363 { "vddrf", 300000 }, 1364 { "vddch0", 450000 }, 1365 }, 1366 .num_vregs = 4, 1367 }; 1368 1369 static const struct qca_vreg_data qca_soc_data_wcn3991 = { 1370 .soc_type = QCA_WCN3991, 1371 .vregs = (struct qca_vreg []) { 1372 { "vddio", 15000 }, 1373 { "vddxo", 80000 }, 1374 { "vddrf", 300000 }, 1375 { "vddch0", 450000 }, 1376 }, 1377 .num_vregs = 4, 1378 }; 1379 1380 static const struct qca_vreg_data qca_soc_data_wcn3998 = { 1381 .soc_type = QCA_WCN3998, 1382 .vregs = (struct qca_vreg []) { 1383 { "vddio", 10000 }, 1384 { "vddxo", 80000 }, 1385 { "vddrf", 300000 }, 1386 { "vddch0", 450000 }, 1387 }, 1388 .num_vregs = 4, 1389 }; 1390 1391 static void qca_power_shutdown(struct hci_uart *hu) 1392 { 1393 struct qca_serdev *qcadev; 1394 struct qca_data *qca = hu->priv; 1395 unsigned long flags; 1396 1397 qcadev = serdev_device_get_drvdata(hu->serdev); 1398 1399 /* From this point we go into power off state. But serial port is 1400 * still open, stop queueing the IBS data and flush all the buffered 1401 * data in skb's. 1402 */ 1403 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 1404 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1405 qca_flush(hu); 1406 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 1407 1408 host_set_baudrate(hu, 2400); 1409 qca_send_power_pulse(hu, false); 1410 qca_regulator_disable(qcadev); 1411 } 1412 1413 static int qca_power_off(struct hci_dev *hdev) 1414 { 1415 struct hci_uart *hu = hci_get_drvdata(hdev); 1416 1417 /* Perform pre shutdown command */ 1418 qca_send_pre_shutdown_cmd(hdev); 1419 1420 usleep_range(8000, 10000); 1421 1422 qca_power_shutdown(hu); 1423 return 0; 1424 } 1425 1426 static int qca_regulator_enable(struct qca_serdev *qcadev) 1427 { 1428 struct qca_power *power = qcadev->bt_power; 1429 int ret; 1430 1431 /* Already enabled */ 1432 if (power->vregs_on) 1433 return 0; 1434 1435 BT_DBG("enabling %d regulators)", power->num_vregs); 1436 1437 ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk); 1438 if (ret) 1439 return ret; 1440 1441 power->vregs_on = true; 1442 1443 return 0; 1444 } 1445 1446 static void qca_regulator_disable(struct qca_serdev *qcadev) 1447 { 1448 struct qca_power *power; 1449 1450 if (!qcadev) 1451 return; 1452 1453 power = qcadev->bt_power; 1454 1455 /* Already disabled? */ 1456 if (!power->vregs_on) 1457 return; 1458 1459 regulator_bulk_disable(power->num_vregs, power->vreg_bulk); 1460 power->vregs_on = false; 1461 } 1462 1463 static int qca_init_regulators(struct qca_power *qca, 1464 const struct qca_vreg *vregs, size_t num_vregs) 1465 { 1466 struct regulator_bulk_data *bulk; 1467 int ret; 1468 int i; 1469 1470 bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL); 1471 if (!bulk) 1472 return -ENOMEM; 1473 1474 for (i = 0; i < num_vregs; i++) 1475 bulk[i].supply = vregs[i].name; 1476 1477 ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk); 1478 if (ret < 0) 1479 return ret; 1480 1481 for (i = 0; i < num_vregs; i++) { 1482 ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA); 1483 if (ret) 1484 return ret; 1485 } 1486 1487 qca->vreg_bulk = bulk; 1488 qca->num_vregs = num_vregs; 1489 1490 return 0; 1491 } 1492 1493 static int qca_serdev_probe(struct serdev_device *serdev) 1494 { 1495 struct qca_serdev *qcadev; 1496 const struct qca_vreg_data *data; 1497 int err; 1498 1499 qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL); 1500 if (!qcadev) 1501 return -ENOMEM; 1502 1503 qcadev->serdev_hu.serdev = serdev; 1504 data = of_device_get_match_data(&serdev->dev); 1505 serdev_device_set_drvdata(serdev, qcadev); 1506 device_property_read_string(&serdev->dev, "firmware-name", 1507 &qcadev->firmware_name); 1508 if (data && qca_is_wcn399x(data->soc_type)) { 1509 qcadev->btsoc_type = data->soc_type; 1510 qcadev->bt_power = devm_kzalloc(&serdev->dev, 1511 sizeof(struct qca_power), 1512 GFP_KERNEL); 1513 if (!qcadev->bt_power) 1514 return -ENOMEM; 1515 1516 qcadev->bt_power->dev = &serdev->dev; 1517 err = qca_init_regulators(qcadev->bt_power, data->vregs, 1518 data->num_vregs); 1519 if (err) { 1520 BT_ERR("Failed to init regulators:%d", err); 1521 goto out; 1522 } 1523 1524 qcadev->bt_power->vregs_on = false; 1525 1526 device_property_read_u32(&serdev->dev, "max-speed", 1527 &qcadev->oper_speed); 1528 if (!qcadev->oper_speed) 1529 BT_DBG("UART will pick default operating speed"); 1530 1531 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); 1532 if (err) { 1533 BT_ERR("wcn3990 serdev registration failed"); 1534 goto out; 1535 } 1536 } else { 1537 qcadev->btsoc_type = QCA_ROME; 1538 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable", 1539 GPIOD_OUT_LOW); 1540 if (IS_ERR(qcadev->bt_en)) { 1541 dev_err(&serdev->dev, "failed to acquire enable gpio\n"); 1542 return PTR_ERR(qcadev->bt_en); 1543 } 1544 1545 qcadev->susclk = devm_clk_get(&serdev->dev, NULL); 1546 if (IS_ERR(qcadev->susclk)) { 1547 dev_err(&serdev->dev, "failed to acquire clk\n"); 1548 return PTR_ERR(qcadev->susclk); 1549 } 1550 1551 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ); 1552 if (err) 1553 return err; 1554 1555 err = clk_prepare_enable(qcadev->susclk); 1556 if (err) 1557 return err; 1558 1559 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); 1560 if (err) 1561 clk_disable_unprepare(qcadev->susclk); 1562 } 1563 1564 out: return err; 1565 1566 } 1567 1568 static void qca_serdev_remove(struct serdev_device *serdev) 1569 { 1570 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); 1571 1572 if (qca_is_wcn399x(qcadev->btsoc_type)) 1573 qca_power_shutdown(&qcadev->serdev_hu); 1574 else 1575 clk_disable_unprepare(qcadev->susclk); 1576 1577 hci_uart_unregister_device(&qcadev->serdev_hu); 1578 } 1579 1580 static int __maybe_unused qca_suspend(struct device *dev) 1581 { 1582 struct hci_dev *hdev = container_of(dev, struct hci_dev, dev); 1583 struct hci_uart *hu = hci_get_drvdata(hdev); 1584 struct qca_data *qca = hu->priv; 1585 unsigned long flags; 1586 int ret = 0; 1587 u8 cmd; 1588 1589 set_bit(QCA_SUSPENDING, &qca->flags); 1590 1591 /* Device is downloading patch or doesn't support in-band sleep. */ 1592 if (!test_bit(QCA_IBS_ENABLED, &qca->flags)) 1593 return 0; 1594 1595 cancel_work_sync(&qca->ws_awake_device); 1596 cancel_work_sync(&qca->ws_awake_rx); 1597 1598 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 1599 flags, SINGLE_DEPTH_NESTING); 1600 1601 switch (qca->tx_ibs_state) { 1602 case HCI_IBS_TX_WAKING: 1603 del_timer(&qca->wake_retrans_timer); 1604 /* Fall through */ 1605 case HCI_IBS_TX_AWAKE: 1606 del_timer(&qca->tx_idle_timer); 1607 1608 serdev_device_write_flush(hu->serdev); 1609 cmd = HCI_IBS_SLEEP_IND; 1610 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd)); 1611 1612 if (ret < 0) { 1613 BT_ERR("Failed to send SLEEP to device"); 1614 break; 1615 } 1616 1617 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 1618 qca->ibs_sent_slps++; 1619 1620 qca_wq_serial_tx_clock_vote_off(&qca->ws_tx_vote_off); 1621 break; 1622 1623 case HCI_IBS_TX_ASLEEP: 1624 break; 1625 1626 default: 1627 BT_ERR("Spurious tx state %d", qca->tx_ibs_state); 1628 ret = -EINVAL; 1629 break; 1630 } 1631 1632 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 1633 1634 if (ret < 0) 1635 goto error; 1636 1637 serdev_device_wait_until_sent(hu->serdev, 1638 msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS)); 1639 1640 /* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going 1641 * to sleep, so that the packet does not wake the system later. 1642 */ 1643 1644 ret = wait_event_interruptible_timeout(qca->suspend_wait_q, 1645 qca->rx_ibs_state == HCI_IBS_RX_ASLEEP, 1646 msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS)); 1647 1648 if (ret > 0) 1649 return 0; 1650 1651 if (ret == 0) 1652 ret = -ETIMEDOUT; 1653 1654 error: 1655 clear_bit(QCA_SUSPENDING, &qca->flags); 1656 1657 return ret; 1658 } 1659 1660 static int __maybe_unused qca_resume(struct device *dev) 1661 { 1662 struct hci_dev *hdev = container_of(dev, struct hci_dev, dev); 1663 struct hci_uart *hu = hci_get_drvdata(hdev); 1664 struct qca_data *qca = hu->priv; 1665 1666 clear_bit(QCA_SUSPENDING, &qca->flags); 1667 1668 return 0; 1669 } 1670 1671 static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume); 1672 1673 static const struct of_device_id qca_bluetooth_of_match[] = { 1674 { .compatible = "qcom,qca6174-bt" }, 1675 { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990}, 1676 { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991}, 1677 { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998}, 1678 { /* sentinel */ } 1679 }; 1680 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match); 1681 1682 static struct serdev_device_driver qca_serdev_driver = { 1683 .probe = qca_serdev_probe, 1684 .remove = qca_serdev_remove, 1685 .driver = { 1686 .name = "hci_uart_qca", 1687 .of_match_table = qca_bluetooth_of_match, 1688 .pm = &qca_pm_ops, 1689 }, 1690 }; 1691 1692 int __init qca_init(void) 1693 { 1694 serdev_device_driver_register(&qca_serdev_driver); 1695 1696 return hci_uart_register_proto(&qca_proto); 1697 } 1698 1699 int __exit qca_deinit(void) 1700 { 1701 serdev_device_driver_unregister(&qca_serdev_driver); 1702 1703 return hci_uart_unregister_proto(&qca_proto); 1704 } 1705