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_TX_IDLE_TIMEOUT_MS 2000 47 #define CMD_TRANS_TIMEOUT_MS 100 48 49 /* susclk rate */ 50 #define SUSCLK_RATE_32KHZ 32768 51 52 /* Controller debug log header */ 53 #define QCA_DEBUG_HANDLE 0x2EDC 54 55 enum qca_flags { 56 QCA_IBS_ENABLED, 57 QCA_DROP_VENDOR_EVENT, 58 }; 59 60 /* HCI_IBS transmit side sleep protocol states */ 61 enum tx_ibs_states { 62 HCI_IBS_TX_ASLEEP, 63 HCI_IBS_TX_WAKING, 64 HCI_IBS_TX_AWAKE, 65 }; 66 67 /* HCI_IBS receive side sleep protocol states */ 68 enum rx_states { 69 HCI_IBS_RX_ASLEEP, 70 HCI_IBS_RX_AWAKE, 71 }; 72 73 /* HCI_IBS transmit and receive side clock state vote */ 74 enum hci_ibs_clock_state_vote { 75 HCI_IBS_VOTE_STATS_UPDATE, 76 HCI_IBS_TX_VOTE_CLOCK_ON, 77 HCI_IBS_TX_VOTE_CLOCK_OFF, 78 HCI_IBS_RX_VOTE_CLOCK_ON, 79 HCI_IBS_RX_VOTE_CLOCK_OFF, 80 }; 81 82 struct qca_data { 83 struct hci_uart *hu; 84 struct sk_buff *rx_skb; 85 struct sk_buff_head txq; 86 struct sk_buff_head tx_wait_q; /* HCI_IBS wait queue */ 87 spinlock_t hci_ibs_lock; /* HCI_IBS state lock */ 88 u8 tx_ibs_state; /* HCI_IBS transmit side power state*/ 89 u8 rx_ibs_state; /* HCI_IBS receive side power state */ 90 bool tx_vote; /* Clock must be on for TX */ 91 bool rx_vote; /* Clock must be on for RX */ 92 struct timer_list tx_idle_timer; 93 u32 tx_idle_delay; 94 struct timer_list wake_retrans_timer; 95 u32 wake_retrans; 96 struct workqueue_struct *workqueue; 97 struct work_struct ws_awake_rx; 98 struct work_struct ws_awake_device; 99 struct work_struct ws_rx_vote_off; 100 struct work_struct ws_tx_vote_off; 101 unsigned long flags; 102 struct completion drop_ev_comp; 103 104 /* For debugging purpose */ 105 u64 ibs_sent_wacks; 106 u64 ibs_sent_slps; 107 u64 ibs_sent_wakes; 108 u64 ibs_recv_wacks; 109 u64 ibs_recv_slps; 110 u64 ibs_recv_wakes; 111 u64 vote_last_jif; 112 u32 vote_on_ms; 113 u32 vote_off_ms; 114 u64 tx_votes_on; 115 u64 rx_votes_on; 116 u64 tx_votes_off; 117 u64 rx_votes_off; 118 u64 votes_on; 119 u64 votes_off; 120 }; 121 122 enum qca_speed_type { 123 QCA_INIT_SPEED = 1, 124 QCA_OPER_SPEED 125 }; 126 127 /* 128 * Voltage regulator information required for configuring the 129 * QCA Bluetooth chipset 130 */ 131 struct qca_vreg { 132 const char *name; 133 unsigned int min_uV; 134 unsigned int max_uV; 135 unsigned int load_uA; 136 }; 137 138 struct qca_vreg_data { 139 enum qca_btsoc_type soc_type; 140 struct qca_vreg *vregs; 141 size_t num_vregs; 142 }; 143 144 /* 145 * Platform data for the QCA Bluetooth power driver. 146 */ 147 struct qca_power { 148 struct device *dev; 149 const struct qca_vreg_data *vreg_data; 150 struct regulator_bulk_data *vreg_bulk; 151 bool vregs_on; 152 }; 153 154 struct qca_serdev { 155 struct hci_uart serdev_hu; 156 struct gpio_desc *bt_en; 157 struct clk *susclk; 158 enum qca_btsoc_type btsoc_type; 159 struct qca_power *bt_power; 160 u32 init_speed; 161 u32 oper_speed; 162 const char *firmware_name; 163 }; 164 165 static int qca_power_setup(struct hci_uart *hu, bool on); 166 static void qca_power_shutdown(struct hci_uart *hu); 167 static int qca_power_off(struct hci_dev *hdev); 168 169 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu) 170 { 171 enum qca_btsoc_type soc_type; 172 173 if (hu->serdev) { 174 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev); 175 176 soc_type = qsd->btsoc_type; 177 } else { 178 soc_type = QCA_ROME; 179 } 180 181 return soc_type; 182 } 183 184 static const char *qca_get_firmware_name(struct hci_uart *hu) 185 { 186 if (hu->serdev) { 187 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev); 188 189 return qsd->firmware_name; 190 } else { 191 return NULL; 192 } 193 } 194 195 static void __serial_clock_on(struct tty_struct *tty) 196 { 197 /* TODO: Some chipset requires to enable UART clock on client 198 * side to save power consumption or manual work is required. 199 * Please put your code to control UART clock here if needed 200 */ 201 } 202 203 static void __serial_clock_off(struct tty_struct *tty) 204 { 205 /* TODO: Some chipset requires to disable UART clock on client 206 * side to save power consumption or manual work is required. 207 * Please put your code to control UART clock off here if needed 208 */ 209 } 210 211 /* serial_clock_vote needs to be called with the ibs lock held */ 212 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu) 213 { 214 struct qca_data *qca = hu->priv; 215 unsigned int diff; 216 217 bool old_vote = (qca->tx_vote | qca->rx_vote); 218 bool new_vote; 219 220 switch (vote) { 221 case HCI_IBS_VOTE_STATS_UPDATE: 222 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif); 223 224 if (old_vote) 225 qca->vote_off_ms += diff; 226 else 227 qca->vote_on_ms += diff; 228 return; 229 230 case HCI_IBS_TX_VOTE_CLOCK_ON: 231 qca->tx_vote = true; 232 qca->tx_votes_on++; 233 new_vote = true; 234 break; 235 236 case HCI_IBS_RX_VOTE_CLOCK_ON: 237 qca->rx_vote = true; 238 qca->rx_votes_on++; 239 new_vote = true; 240 break; 241 242 case HCI_IBS_TX_VOTE_CLOCK_OFF: 243 qca->tx_vote = false; 244 qca->tx_votes_off++; 245 new_vote = qca->rx_vote | qca->tx_vote; 246 break; 247 248 case HCI_IBS_RX_VOTE_CLOCK_OFF: 249 qca->rx_vote = false; 250 qca->rx_votes_off++; 251 new_vote = qca->rx_vote | qca->tx_vote; 252 break; 253 254 default: 255 BT_ERR("Voting irregularity"); 256 return; 257 } 258 259 if (new_vote != old_vote) { 260 if (new_vote) 261 __serial_clock_on(hu->tty); 262 else 263 __serial_clock_off(hu->tty); 264 265 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false", 266 vote ? "true" : "false"); 267 268 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif); 269 270 if (new_vote) { 271 qca->votes_on++; 272 qca->vote_off_ms += diff; 273 } else { 274 qca->votes_off++; 275 qca->vote_on_ms += diff; 276 } 277 qca->vote_last_jif = jiffies; 278 } 279 } 280 281 /* Builds and sends an HCI_IBS command packet. 282 * These are very simple packets with only 1 cmd byte. 283 */ 284 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu) 285 { 286 int err = 0; 287 struct sk_buff *skb = NULL; 288 struct qca_data *qca = hu->priv; 289 290 BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd); 291 292 skb = bt_skb_alloc(1, GFP_ATOMIC); 293 if (!skb) { 294 BT_ERR("Failed to allocate memory for HCI_IBS packet"); 295 return -ENOMEM; 296 } 297 298 /* Assign HCI_IBS type */ 299 skb_put_u8(skb, cmd); 300 301 skb_queue_tail(&qca->txq, skb); 302 303 return err; 304 } 305 306 static void qca_wq_awake_device(struct work_struct *work) 307 { 308 struct qca_data *qca = container_of(work, struct qca_data, 309 ws_awake_device); 310 struct hci_uart *hu = qca->hu; 311 unsigned long retrans_delay; 312 unsigned long flags; 313 314 BT_DBG("hu %p wq awake device", hu); 315 316 /* Vote for serial clock */ 317 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu); 318 319 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 320 321 /* Send wake indication to device */ 322 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) 323 BT_ERR("Failed to send WAKE to device"); 324 325 qca->ibs_sent_wakes++; 326 327 /* Start retransmit timer */ 328 retrans_delay = msecs_to_jiffies(qca->wake_retrans); 329 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); 330 331 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 332 333 /* Actually send the packets */ 334 hci_uart_tx_wakeup(hu); 335 } 336 337 static void qca_wq_awake_rx(struct work_struct *work) 338 { 339 struct qca_data *qca = container_of(work, struct qca_data, 340 ws_awake_rx); 341 struct hci_uart *hu = qca->hu; 342 unsigned long flags; 343 344 BT_DBG("hu %p wq awake rx", hu); 345 346 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu); 347 348 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 349 qca->rx_ibs_state = HCI_IBS_RX_AWAKE; 350 351 /* Always acknowledge device wake up, 352 * sending IBS message doesn't count as TX ON. 353 */ 354 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) 355 BT_ERR("Failed to acknowledge device wake up"); 356 357 qca->ibs_sent_wacks++; 358 359 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 360 361 /* Actually send the packets */ 362 hci_uart_tx_wakeup(hu); 363 } 364 365 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work) 366 { 367 struct qca_data *qca = container_of(work, struct qca_data, 368 ws_rx_vote_off); 369 struct hci_uart *hu = qca->hu; 370 371 BT_DBG("hu %p rx clock vote off", hu); 372 373 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu); 374 } 375 376 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work) 377 { 378 struct qca_data *qca = container_of(work, struct qca_data, 379 ws_tx_vote_off); 380 struct hci_uart *hu = qca->hu; 381 382 BT_DBG("hu %p tx clock vote off", hu); 383 384 /* Run HCI tx handling unlocked */ 385 hci_uart_tx_wakeup(hu); 386 387 /* Now that message queued to tty driver, vote for tty clocks off. 388 * It is up to the tty driver to pend the clocks off until tx done. 389 */ 390 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu); 391 } 392 393 static void hci_ibs_tx_idle_timeout(struct timer_list *t) 394 { 395 struct qca_data *qca = from_timer(qca, t, tx_idle_timer); 396 struct hci_uart *hu = qca->hu; 397 unsigned long flags; 398 399 BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state); 400 401 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 402 flags, SINGLE_DEPTH_NESTING); 403 404 switch (qca->tx_ibs_state) { 405 case HCI_IBS_TX_AWAKE: 406 /* TX_IDLE, go to SLEEP */ 407 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) { 408 BT_ERR("Failed to send SLEEP to device"); 409 break; 410 } 411 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 412 qca->ibs_sent_slps++; 413 queue_work(qca->workqueue, &qca->ws_tx_vote_off); 414 break; 415 416 case HCI_IBS_TX_ASLEEP: 417 case HCI_IBS_TX_WAKING: 418 /* Fall through */ 419 420 default: 421 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state); 422 break; 423 } 424 425 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 426 } 427 428 static void hci_ibs_wake_retrans_timeout(struct timer_list *t) 429 { 430 struct qca_data *qca = from_timer(qca, t, wake_retrans_timer); 431 struct hci_uart *hu = qca->hu; 432 unsigned long flags, retrans_delay; 433 bool retransmit = false; 434 435 BT_DBG("hu %p wake retransmit timeout in %d state", 436 hu, qca->tx_ibs_state); 437 438 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 439 flags, SINGLE_DEPTH_NESTING); 440 441 switch (qca->tx_ibs_state) { 442 case HCI_IBS_TX_WAKING: 443 /* No WAKE_ACK, retransmit WAKE */ 444 retransmit = true; 445 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) { 446 BT_ERR("Failed to acknowledge device wake up"); 447 break; 448 } 449 qca->ibs_sent_wakes++; 450 retrans_delay = msecs_to_jiffies(qca->wake_retrans); 451 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); 452 break; 453 454 case HCI_IBS_TX_ASLEEP: 455 case HCI_IBS_TX_AWAKE: 456 /* Fall through */ 457 458 default: 459 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state); 460 break; 461 } 462 463 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 464 465 if (retransmit) 466 hci_uart_tx_wakeup(hu); 467 } 468 469 /* Initialize protocol */ 470 static int qca_open(struct hci_uart *hu) 471 { 472 struct qca_serdev *qcadev; 473 struct qca_data *qca; 474 int ret; 475 476 BT_DBG("hu %p qca_open", hu); 477 478 if (!hci_uart_has_flow_control(hu)) 479 return -EOPNOTSUPP; 480 481 qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL); 482 if (!qca) 483 return -ENOMEM; 484 485 skb_queue_head_init(&qca->txq); 486 skb_queue_head_init(&qca->tx_wait_q); 487 spin_lock_init(&qca->hci_ibs_lock); 488 qca->workqueue = alloc_ordered_workqueue("qca_wq", 0); 489 if (!qca->workqueue) { 490 BT_ERR("QCA Workqueue not initialized properly"); 491 kfree(qca); 492 return -ENOMEM; 493 } 494 495 INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx); 496 INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device); 497 INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off); 498 INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off); 499 500 qca->hu = hu; 501 init_completion(&qca->drop_ev_comp); 502 503 /* Assume we start with both sides asleep -- extra wakes OK */ 504 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 505 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; 506 507 qca->vote_last_jif = jiffies; 508 509 hu->priv = qca; 510 511 if (hu->serdev) { 512 513 qcadev = serdev_device_get_drvdata(hu->serdev); 514 if (!qca_is_wcn399x(qcadev->btsoc_type)) { 515 gpiod_set_value_cansleep(qcadev->bt_en, 1); 516 /* Controller needs time to bootup. */ 517 msleep(150); 518 } else { 519 hu->init_speed = qcadev->init_speed; 520 hu->oper_speed = qcadev->oper_speed; 521 ret = qca_power_setup(hu, true); 522 if (ret) { 523 destroy_workqueue(qca->workqueue); 524 kfree_skb(qca->rx_skb); 525 hu->priv = NULL; 526 kfree(qca); 527 return ret; 528 } 529 } 530 } 531 532 timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0); 533 qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS; 534 535 timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0); 536 qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS; 537 538 BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u", 539 qca->tx_idle_delay, qca->wake_retrans); 540 541 return 0; 542 } 543 544 static void qca_debugfs_init(struct hci_dev *hdev) 545 { 546 struct hci_uart *hu = hci_get_drvdata(hdev); 547 struct qca_data *qca = hu->priv; 548 struct dentry *ibs_dir; 549 umode_t mode; 550 551 if (!hdev->debugfs) 552 return; 553 554 ibs_dir = debugfs_create_dir("ibs", hdev->debugfs); 555 556 /* read only */ 557 mode = S_IRUGO; 558 debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state); 559 debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state); 560 debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir, 561 &qca->ibs_sent_slps); 562 debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir, 563 &qca->ibs_sent_wakes); 564 debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir, 565 &qca->ibs_sent_wacks); 566 debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir, 567 &qca->ibs_recv_slps); 568 debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir, 569 &qca->ibs_recv_wakes); 570 debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir, 571 &qca->ibs_recv_wacks); 572 debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote); 573 debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on); 574 debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off); 575 debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote); 576 debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on); 577 debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off); 578 debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on); 579 debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off); 580 debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms); 581 debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms); 582 583 /* read/write */ 584 mode = S_IRUGO | S_IWUSR; 585 debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans); 586 debugfs_create_u32("tx_idle_delay", mode, ibs_dir, 587 &qca->tx_idle_delay); 588 } 589 590 /* Flush protocol data */ 591 static int qca_flush(struct hci_uart *hu) 592 { 593 struct qca_data *qca = hu->priv; 594 595 BT_DBG("hu %p qca flush", hu); 596 597 skb_queue_purge(&qca->tx_wait_q); 598 skb_queue_purge(&qca->txq); 599 600 return 0; 601 } 602 603 /* Close protocol */ 604 static int qca_close(struct hci_uart *hu) 605 { 606 struct qca_serdev *qcadev; 607 struct qca_data *qca = hu->priv; 608 609 BT_DBG("hu %p qca close", hu); 610 611 serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu); 612 613 skb_queue_purge(&qca->tx_wait_q); 614 skb_queue_purge(&qca->txq); 615 del_timer(&qca->tx_idle_timer); 616 del_timer(&qca->wake_retrans_timer); 617 destroy_workqueue(qca->workqueue); 618 qca->hu = NULL; 619 620 if (hu->serdev) { 621 qcadev = serdev_device_get_drvdata(hu->serdev); 622 if (qca_is_wcn399x(qcadev->btsoc_type)) 623 qca_power_shutdown(hu); 624 else 625 gpiod_set_value_cansleep(qcadev->bt_en, 0); 626 627 } 628 629 kfree_skb(qca->rx_skb); 630 631 hu->priv = NULL; 632 633 kfree(qca); 634 635 return 0; 636 } 637 638 /* Called upon a wake-up-indication from the device. 639 */ 640 static void device_want_to_wakeup(struct hci_uart *hu) 641 { 642 unsigned long flags; 643 struct qca_data *qca = hu->priv; 644 645 BT_DBG("hu %p want to wake up", hu); 646 647 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 648 649 qca->ibs_recv_wakes++; 650 651 switch (qca->rx_ibs_state) { 652 case HCI_IBS_RX_ASLEEP: 653 /* Make sure clock is on - we may have turned clock off since 654 * receiving the wake up indicator awake rx clock. 655 */ 656 queue_work(qca->workqueue, &qca->ws_awake_rx); 657 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 658 return; 659 660 case HCI_IBS_RX_AWAKE: 661 /* Always acknowledge device wake up, 662 * sending IBS message doesn't count as TX ON. 663 */ 664 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) { 665 BT_ERR("Failed to acknowledge device wake up"); 666 break; 667 } 668 qca->ibs_sent_wacks++; 669 break; 670 671 default: 672 /* Any other state is illegal */ 673 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d", 674 qca->rx_ibs_state); 675 break; 676 } 677 678 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 679 680 /* Actually send the packets */ 681 hci_uart_tx_wakeup(hu); 682 } 683 684 /* Called upon a sleep-indication from the device. 685 */ 686 static void device_want_to_sleep(struct hci_uart *hu) 687 { 688 unsigned long flags; 689 struct qca_data *qca = hu->priv; 690 691 BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state); 692 693 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 694 695 qca->ibs_recv_slps++; 696 697 switch (qca->rx_ibs_state) { 698 case HCI_IBS_RX_AWAKE: 699 /* Update state */ 700 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; 701 /* Vote off rx clock under workqueue */ 702 queue_work(qca->workqueue, &qca->ws_rx_vote_off); 703 break; 704 705 case HCI_IBS_RX_ASLEEP: 706 break; 707 708 default: 709 /* Any other state is illegal */ 710 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d", 711 qca->rx_ibs_state); 712 break; 713 } 714 715 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 716 } 717 718 /* Called upon wake-up-acknowledgement from the device 719 */ 720 static void device_woke_up(struct hci_uart *hu) 721 { 722 unsigned long flags, idle_delay; 723 struct qca_data *qca = hu->priv; 724 struct sk_buff *skb = NULL; 725 726 BT_DBG("hu %p woke up", hu); 727 728 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 729 730 qca->ibs_recv_wacks++; 731 732 switch (qca->tx_ibs_state) { 733 case HCI_IBS_TX_AWAKE: 734 /* Expect one if we send 2 WAKEs */ 735 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d", 736 qca->tx_ibs_state); 737 break; 738 739 case HCI_IBS_TX_WAKING: 740 /* Send pending packets */ 741 while ((skb = skb_dequeue(&qca->tx_wait_q))) 742 skb_queue_tail(&qca->txq, skb); 743 744 /* Switch timers and change state to HCI_IBS_TX_AWAKE */ 745 del_timer(&qca->wake_retrans_timer); 746 idle_delay = msecs_to_jiffies(qca->tx_idle_delay); 747 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); 748 qca->tx_ibs_state = HCI_IBS_TX_AWAKE; 749 break; 750 751 case HCI_IBS_TX_ASLEEP: 752 /* Fall through */ 753 754 default: 755 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d", 756 qca->tx_ibs_state); 757 break; 758 } 759 760 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 761 762 /* Actually send the packets */ 763 hci_uart_tx_wakeup(hu); 764 } 765 766 /* Enqueue frame for transmittion (padding, crc, etc) may be called from 767 * two simultaneous tasklets. 768 */ 769 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb) 770 { 771 unsigned long flags = 0, idle_delay; 772 struct qca_data *qca = hu->priv; 773 774 BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb, 775 qca->tx_ibs_state); 776 777 /* Prepend skb with frame type */ 778 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 779 780 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 781 782 /* Don't go to sleep in middle of patch download or 783 * Out-Of-Band(GPIOs control) sleep is selected. 784 */ 785 if (!test_bit(QCA_IBS_ENABLED, &qca->flags)) { 786 skb_queue_tail(&qca->txq, skb); 787 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 788 return 0; 789 } 790 791 /* Act according to current state */ 792 switch (qca->tx_ibs_state) { 793 case HCI_IBS_TX_AWAKE: 794 BT_DBG("Device awake, sending normally"); 795 skb_queue_tail(&qca->txq, skb); 796 idle_delay = msecs_to_jiffies(qca->tx_idle_delay); 797 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); 798 break; 799 800 case HCI_IBS_TX_ASLEEP: 801 BT_DBG("Device asleep, waking up and queueing packet"); 802 /* Save packet for later */ 803 skb_queue_tail(&qca->tx_wait_q, skb); 804 805 qca->tx_ibs_state = HCI_IBS_TX_WAKING; 806 /* Schedule a work queue to wake up device */ 807 queue_work(qca->workqueue, &qca->ws_awake_device); 808 break; 809 810 case HCI_IBS_TX_WAKING: 811 BT_DBG("Device waking up, queueing packet"); 812 /* Transient state; just keep packet for later */ 813 skb_queue_tail(&qca->tx_wait_q, skb); 814 break; 815 816 default: 817 BT_ERR("Illegal tx state: %d (losing packet)", 818 qca->tx_ibs_state); 819 kfree_skb(skb); 820 break; 821 } 822 823 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 824 825 return 0; 826 } 827 828 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb) 829 { 830 struct hci_uart *hu = hci_get_drvdata(hdev); 831 832 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND); 833 834 device_want_to_sleep(hu); 835 836 kfree_skb(skb); 837 return 0; 838 } 839 840 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb) 841 { 842 struct hci_uart *hu = hci_get_drvdata(hdev); 843 844 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND); 845 846 device_want_to_wakeup(hu); 847 848 kfree_skb(skb); 849 return 0; 850 } 851 852 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb) 853 { 854 struct hci_uart *hu = hci_get_drvdata(hdev); 855 856 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK); 857 858 device_woke_up(hu); 859 860 kfree_skb(skb); 861 return 0; 862 } 863 864 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb) 865 { 866 /* We receive debug logs from chip as an ACL packets. 867 * Instead of sending the data to ACL to decode the 868 * received data, we are pushing them to the above layers 869 * as a diagnostic packet. 870 */ 871 if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE) 872 return hci_recv_diag(hdev, skb); 873 874 return hci_recv_frame(hdev, skb); 875 } 876 877 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb) 878 { 879 struct hci_uart *hu = hci_get_drvdata(hdev); 880 struct qca_data *qca = hu->priv; 881 882 if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) { 883 struct hci_event_hdr *hdr = (void *)skb->data; 884 885 /* For the WCN3990 the vendor command for a baudrate change 886 * isn't sent as synchronous HCI command, because the 887 * controller sends the corresponding vendor event with the 888 * new baudrate. The event is received and properly decoded 889 * after changing the baudrate of the host port. It needs to 890 * be dropped, otherwise it can be misinterpreted as 891 * response to a later firmware download command (also a 892 * vendor command). 893 */ 894 895 if (hdr->evt == HCI_EV_VENDOR) 896 complete(&qca->drop_ev_comp); 897 898 kfree_skb(skb); 899 900 return 0; 901 } 902 903 return hci_recv_frame(hdev, skb); 904 } 905 906 #define QCA_IBS_SLEEP_IND_EVENT \ 907 .type = HCI_IBS_SLEEP_IND, \ 908 .hlen = 0, \ 909 .loff = 0, \ 910 .lsize = 0, \ 911 .maxlen = HCI_MAX_IBS_SIZE 912 913 #define QCA_IBS_WAKE_IND_EVENT \ 914 .type = HCI_IBS_WAKE_IND, \ 915 .hlen = 0, \ 916 .loff = 0, \ 917 .lsize = 0, \ 918 .maxlen = HCI_MAX_IBS_SIZE 919 920 #define QCA_IBS_WAKE_ACK_EVENT \ 921 .type = HCI_IBS_WAKE_ACK, \ 922 .hlen = 0, \ 923 .loff = 0, \ 924 .lsize = 0, \ 925 .maxlen = HCI_MAX_IBS_SIZE 926 927 static const struct h4_recv_pkt qca_recv_pkts[] = { 928 { H4_RECV_ACL, .recv = qca_recv_acl_data }, 929 { H4_RECV_SCO, .recv = hci_recv_frame }, 930 { H4_RECV_EVENT, .recv = qca_recv_event }, 931 { QCA_IBS_WAKE_IND_EVENT, .recv = qca_ibs_wake_ind }, 932 { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_wake_ack }, 933 { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind }, 934 }; 935 936 static int qca_recv(struct hci_uart *hu, const void *data, int count) 937 { 938 struct qca_data *qca = hu->priv; 939 940 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 941 return -EUNATCH; 942 943 qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count, 944 qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts)); 945 if (IS_ERR(qca->rx_skb)) { 946 int err = PTR_ERR(qca->rx_skb); 947 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 948 qca->rx_skb = NULL; 949 return err; 950 } 951 952 return count; 953 } 954 955 static struct sk_buff *qca_dequeue(struct hci_uart *hu) 956 { 957 struct qca_data *qca = hu->priv; 958 959 return skb_dequeue(&qca->txq); 960 } 961 962 static uint8_t qca_get_baudrate_value(int speed) 963 { 964 switch (speed) { 965 case 9600: 966 return QCA_BAUDRATE_9600; 967 case 19200: 968 return QCA_BAUDRATE_19200; 969 case 38400: 970 return QCA_BAUDRATE_38400; 971 case 57600: 972 return QCA_BAUDRATE_57600; 973 case 115200: 974 return QCA_BAUDRATE_115200; 975 case 230400: 976 return QCA_BAUDRATE_230400; 977 case 460800: 978 return QCA_BAUDRATE_460800; 979 case 500000: 980 return QCA_BAUDRATE_500000; 981 case 921600: 982 return QCA_BAUDRATE_921600; 983 case 1000000: 984 return QCA_BAUDRATE_1000000; 985 case 2000000: 986 return QCA_BAUDRATE_2000000; 987 case 3000000: 988 return QCA_BAUDRATE_3000000; 989 case 3200000: 990 return QCA_BAUDRATE_3200000; 991 case 3500000: 992 return QCA_BAUDRATE_3500000; 993 default: 994 return QCA_BAUDRATE_115200; 995 } 996 } 997 998 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) 999 { 1000 struct hci_uart *hu = hci_get_drvdata(hdev); 1001 struct qca_data *qca = hu->priv; 1002 struct sk_buff *skb; 1003 u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 }; 1004 1005 if (baudrate > QCA_BAUDRATE_3200000) 1006 return -EINVAL; 1007 1008 cmd[4] = baudrate; 1009 1010 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL); 1011 if (!skb) { 1012 bt_dev_err(hdev, "Failed to allocate baudrate packet"); 1013 return -ENOMEM; 1014 } 1015 1016 /* Assign commands to change baudrate and packet type. */ 1017 skb_put_data(skb, cmd, sizeof(cmd)); 1018 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT; 1019 1020 skb_queue_tail(&qca->txq, skb); 1021 hci_uart_tx_wakeup(hu); 1022 1023 /* Wait for the baudrate change request to be sent */ 1024 1025 while (!skb_queue_empty(&qca->txq)) 1026 usleep_range(100, 200); 1027 1028 if (hu->serdev) 1029 serdev_device_wait_until_sent(hu->serdev, 1030 msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS)); 1031 1032 /* Give the controller time to process the request */ 1033 if (qca_is_wcn399x(qca_soc_type(hu))) 1034 msleep(10); 1035 else 1036 msleep(300); 1037 1038 return 0; 1039 } 1040 1041 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) 1042 { 1043 if (hu->serdev) 1044 serdev_device_set_baudrate(hu->serdev, speed); 1045 else 1046 hci_uart_set_baudrate(hu, speed); 1047 } 1048 1049 static int qca_send_power_pulse(struct hci_uart *hu, bool on) 1050 { 1051 int ret; 1052 int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS); 1053 u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE; 1054 1055 /* These power pulses are single byte command which are sent 1056 * at required baudrate to wcn3990. On wcn3990, we have an external 1057 * circuit at Tx pin which decodes the pulse sent at specific baudrate. 1058 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT 1059 * and also we use the same power inputs to turn on and off for 1060 * Wi-Fi/BT. Powering up the power sources will not enable BT, until 1061 * we send a power on pulse at 115200 bps. This algorithm will help to 1062 * save power. Disabling hardware flow control is mandatory while 1063 * sending power pulses to SoC. 1064 */ 1065 bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd); 1066 1067 serdev_device_write_flush(hu->serdev); 1068 hci_uart_set_flow_control(hu, true); 1069 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd)); 1070 if (ret < 0) { 1071 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd); 1072 return ret; 1073 } 1074 1075 serdev_device_wait_until_sent(hu->serdev, timeout); 1076 hci_uart_set_flow_control(hu, false); 1077 1078 /* Give to controller time to boot/shutdown */ 1079 if (on) 1080 msleep(100); 1081 else 1082 msleep(10); 1083 1084 return 0; 1085 } 1086 1087 static unsigned int qca_get_speed(struct hci_uart *hu, 1088 enum qca_speed_type speed_type) 1089 { 1090 unsigned int speed = 0; 1091 1092 if (speed_type == QCA_INIT_SPEED) { 1093 if (hu->init_speed) 1094 speed = hu->init_speed; 1095 else if (hu->proto->init_speed) 1096 speed = hu->proto->init_speed; 1097 } else { 1098 if (hu->oper_speed) 1099 speed = hu->oper_speed; 1100 else if (hu->proto->oper_speed) 1101 speed = hu->proto->oper_speed; 1102 } 1103 1104 return speed; 1105 } 1106 1107 static int qca_check_speeds(struct hci_uart *hu) 1108 { 1109 if (qca_is_wcn399x(qca_soc_type(hu))) { 1110 if (!qca_get_speed(hu, QCA_INIT_SPEED) && 1111 !qca_get_speed(hu, QCA_OPER_SPEED)) 1112 return -EINVAL; 1113 } else { 1114 if (!qca_get_speed(hu, QCA_INIT_SPEED) || 1115 !qca_get_speed(hu, QCA_OPER_SPEED)) 1116 return -EINVAL; 1117 } 1118 1119 return 0; 1120 } 1121 1122 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type) 1123 { 1124 unsigned int speed, qca_baudrate; 1125 struct qca_data *qca = hu->priv; 1126 int ret = 0; 1127 1128 if (speed_type == QCA_INIT_SPEED) { 1129 speed = qca_get_speed(hu, QCA_INIT_SPEED); 1130 if (speed) 1131 host_set_baudrate(hu, speed); 1132 } else { 1133 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1134 1135 speed = qca_get_speed(hu, QCA_OPER_SPEED); 1136 if (!speed) 1137 return 0; 1138 1139 /* Disable flow control for wcn3990 to deassert RTS while 1140 * changing the baudrate of chip and host. 1141 */ 1142 if (qca_is_wcn399x(soc_type)) 1143 hci_uart_set_flow_control(hu, true); 1144 1145 if (soc_type == QCA_WCN3990) { 1146 reinit_completion(&qca->drop_ev_comp); 1147 set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags); 1148 } 1149 1150 qca_baudrate = qca_get_baudrate_value(speed); 1151 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed); 1152 ret = qca_set_baudrate(hu->hdev, qca_baudrate); 1153 if (ret) 1154 goto error; 1155 1156 host_set_baudrate(hu, speed); 1157 1158 error: 1159 if (qca_is_wcn399x(soc_type)) 1160 hci_uart_set_flow_control(hu, false); 1161 1162 if (soc_type == QCA_WCN3990) { 1163 /* Wait for the controller to send the vendor event 1164 * for the baudrate change command. 1165 */ 1166 if (!wait_for_completion_timeout(&qca->drop_ev_comp, 1167 msecs_to_jiffies(100))) { 1168 bt_dev_err(hu->hdev, 1169 "Failed to change controller baudrate\n"); 1170 ret = -ETIMEDOUT; 1171 } 1172 1173 clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags); 1174 } 1175 } 1176 1177 return ret; 1178 } 1179 1180 static int qca_wcn3990_init(struct hci_uart *hu) 1181 { 1182 struct qca_serdev *qcadev; 1183 int ret; 1184 1185 /* Check for vregs status, may be hci down has turned 1186 * off the voltage regulator. 1187 */ 1188 qcadev = serdev_device_get_drvdata(hu->serdev); 1189 if (!qcadev->bt_power->vregs_on) { 1190 serdev_device_close(hu->serdev); 1191 ret = qca_power_setup(hu, true); 1192 if (ret) 1193 return ret; 1194 1195 ret = serdev_device_open(hu->serdev); 1196 if (ret) { 1197 bt_dev_err(hu->hdev, "failed to open port"); 1198 return ret; 1199 } 1200 } 1201 1202 /* Forcefully enable wcn3990 to enter in to boot mode. */ 1203 host_set_baudrate(hu, 2400); 1204 ret = qca_send_power_pulse(hu, false); 1205 if (ret) 1206 return ret; 1207 1208 qca_set_speed(hu, QCA_INIT_SPEED); 1209 ret = qca_send_power_pulse(hu, true); 1210 if (ret) 1211 return ret; 1212 1213 /* Now the device is in ready state to communicate with host. 1214 * To sync host with device we need to reopen port. 1215 * Without this, we will have RTS and CTS synchronization 1216 * issues. 1217 */ 1218 serdev_device_close(hu->serdev); 1219 ret = serdev_device_open(hu->serdev); 1220 if (ret) { 1221 bt_dev_err(hu->hdev, "failed to open port"); 1222 return ret; 1223 } 1224 1225 hci_uart_set_flow_control(hu, false); 1226 1227 return 0; 1228 } 1229 1230 static int qca_setup(struct hci_uart *hu) 1231 { 1232 struct hci_dev *hdev = hu->hdev; 1233 struct qca_data *qca = hu->priv; 1234 unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200; 1235 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1236 const char *firmware_name = qca_get_firmware_name(hu); 1237 int ret; 1238 int soc_ver = 0; 1239 1240 ret = qca_check_speeds(hu); 1241 if (ret) 1242 return ret; 1243 1244 /* Patch downloading has to be done without IBS mode */ 1245 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1246 1247 /* Enable controller to do both LE scan and BR/EDR inquiry 1248 * simultaneously. 1249 */ 1250 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); 1251 1252 if (qca_is_wcn399x(soc_type)) { 1253 bt_dev_info(hdev, "setting up wcn3990"); 1254 1255 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute 1256 * setup for every hci up. 1257 */ 1258 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); 1259 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks); 1260 hu->hdev->shutdown = qca_power_off; 1261 ret = qca_wcn3990_init(hu); 1262 if (ret) 1263 return ret; 1264 1265 ret = qca_read_soc_version(hdev, &soc_ver); 1266 if (ret) 1267 return ret; 1268 } else { 1269 bt_dev_info(hdev, "ROME setup"); 1270 qca_set_speed(hu, QCA_INIT_SPEED); 1271 } 1272 1273 /* Setup user speed if needed */ 1274 speed = qca_get_speed(hu, QCA_OPER_SPEED); 1275 if (speed) { 1276 ret = qca_set_speed(hu, QCA_OPER_SPEED); 1277 if (ret) 1278 return ret; 1279 1280 qca_baudrate = qca_get_baudrate_value(speed); 1281 } 1282 1283 if (!qca_is_wcn399x(soc_type)) { 1284 /* Get QCA version information */ 1285 ret = qca_read_soc_version(hdev, &soc_ver); 1286 if (ret) 1287 return ret; 1288 } 1289 1290 bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver); 1291 /* Setup patch / NVM configurations */ 1292 ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver, 1293 firmware_name); 1294 if (!ret) { 1295 set_bit(QCA_IBS_ENABLED, &qca->flags); 1296 qca_debugfs_init(hdev); 1297 } else if (ret == -ENOENT) { 1298 /* No patch/nvm-config found, run with original fw/config */ 1299 ret = 0; 1300 } else if (ret == -EAGAIN) { 1301 /* 1302 * Userspace firmware loader will return -EAGAIN in case no 1303 * patch/nvm-config is found, so run with original fw/config. 1304 */ 1305 ret = 0; 1306 } 1307 1308 /* Setup bdaddr */ 1309 if (qca_is_wcn399x(soc_type)) 1310 hu->hdev->set_bdaddr = qca_set_bdaddr; 1311 else 1312 hu->hdev->set_bdaddr = qca_set_bdaddr_rome; 1313 1314 return ret; 1315 } 1316 1317 static const struct hci_uart_proto qca_proto = { 1318 .id = HCI_UART_QCA, 1319 .name = "QCA", 1320 .manufacturer = 29, 1321 .init_speed = 115200, 1322 .oper_speed = 3000000, 1323 .open = qca_open, 1324 .close = qca_close, 1325 .flush = qca_flush, 1326 .setup = qca_setup, 1327 .recv = qca_recv, 1328 .enqueue = qca_enqueue, 1329 .dequeue = qca_dequeue, 1330 }; 1331 1332 static const struct qca_vreg_data qca_soc_data_wcn3990 = { 1333 .soc_type = QCA_WCN3990, 1334 .vregs = (struct qca_vreg []) { 1335 { "vddio", 1800000, 1900000, 15000 }, 1336 { "vddxo", 1800000, 1900000, 80000 }, 1337 { "vddrf", 1300000, 1350000, 300000 }, 1338 { "vddch0", 3300000, 3400000, 450000 }, 1339 }, 1340 .num_vregs = 4, 1341 }; 1342 1343 static const struct qca_vreg_data qca_soc_data_wcn3998 = { 1344 .soc_type = QCA_WCN3998, 1345 .vregs = (struct qca_vreg []) { 1346 { "vddio", 1800000, 1900000, 10000 }, 1347 { "vddxo", 1800000, 1900000, 80000 }, 1348 { "vddrf", 1300000, 1352000, 300000 }, 1349 { "vddch0", 3300000, 3300000, 450000 }, 1350 }, 1351 .num_vregs = 4, 1352 }; 1353 1354 static void qca_power_shutdown(struct hci_uart *hu) 1355 { 1356 struct qca_data *qca = hu->priv; 1357 unsigned long flags; 1358 1359 /* From this point we go into power off state. But serial port is 1360 * still open, stop queueing the IBS data and flush all the buffered 1361 * data in skb's. 1362 */ 1363 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 1364 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1365 qca_flush(hu); 1366 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 1367 1368 host_set_baudrate(hu, 2400); 1369 qca_send_power_pulse(hu, false); 1370 qca_power_setup(hu, false); 1371 } 1372 1373 static int qca_power_off(struct hci_dev *hdev) 1374 { 1375 struct hci_uart *hu = hci_get_drvdata(hdev); 1376 1377 /* Perform pre shutdown command */ 1378 qca_send_pre_shutdown_cmd(hdev); 1379 1380 usleep_range(8000, 10000); 1381 1382 qca_power_shutdown(hu); 1383 return 0; 1384 } 1385 1386 static int qca_enable_regulator(struct qca_vreg vregs, 1387 struct regulator *regulator) 1388 { 1389 int ret; 1390 1391 ret = regulator_set_voltage(regulator, vregs.min_uV, 1392 vregs.max_uV); 1393 if (ret) 1394 return ret; 1395 1396 if (vregs.load_uA) 1397 ret = regulator_set_load(regulator, 1398 vregs.load_uA); 1399 1400 if (ret) 1401 return ret; 1402 1403 return regulator_enable(regulator); 1404 1405 } 1406 1407 static void qca_disable_regulator(struct qca_vreg vregs, 1408 struct regulator *regulator) 1409 { 1410 regulator_disable(regulator); 1411 regulator_set_voltage(regulator, 0, vregs.max_uV); 1412 if (vregs.load_uA) 1413 regulator_set_load(regulator, 0); 1414 1415 } 1416 1417 static int qca_power_setup(struct hci_uart *hu, bool on) 1418 { 1419 struct qca_vreg *vregs; 1420 struct regulator_bulk_data *vreg_bulk; 1421 struct qca_serdev *qcadev; 1422 int i, num_vregs, ret = 0; 1423 1424 qcadev = serdev_device_get_drvdata(hu->serdev); 1425 if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data || 1426 !qcadev->bt_power->vreg_bulk) 1427 return -EINVAL; 1428 1429 vregs = qcadev->bt_power->vreg_data->vregs; 1430 vreg_bulk = qcadev->bt_power->vreg_bulk; 1431 num_vregs = qcadev->bt_power->vreg_data->num_vregs; 1432 BT_DBG("on: %d", on); 1433 if (on && !qcadev->bt_power->vregs_on) { 1434 for (i = 0; i < num_vregs; i++) { 1435 ret = qca_enable_regulator(vregs[i], 1436 vreg_bulk[i].consumer); 1437 if (ret) 1438 break; 1439 } 1440 1441 if (ret) { 1442 BT_ERR("failed to enable regulator:%s", vregs[i].name); 1443 /* turn off regulators which are enabled */ 1444 for (i = i - 1; i >= 0; i--) 1445 qca_disable_regulator(vregs[i], 1446 vreg_bulk[i].consumer); 1447 } else { 1448 qcadev->bt_power->vregs_on = true; 1449 } 1450 } else if (!on && qcadev->bt_power->vregs_on) { 1451 /* turn off regulator in reverse order */ 1452 i = qcadev->bt_power->vreg_data->num_vregs - 1; 1453 for ( ; i >= 0; i--) 1454 qca_disable_regulator(vregs[i], vreg_bulk[i].consumer); 1455 1456 qcadev->bt_power->vregs_on = false; 1457 } 1458 1459 return ret; 1460 } 1461 1462 static int qca_init_regulators(struct qca_power *qca, 1463 const struct qca_vreg *vregs, size_t num_vregs) 1464 { 1465 int i; 1466 1467 qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs, 1468 sizeof(struct regulator_bulk_data), 1469 GFP_KERNEL); 1470 if (!qca->vreg_bulk) 1471 return -ENOMEM; 1472 1473 for (i = 0; i < num_vregs; i++) 1474 qca->vreg_bulk[i].supply = vregs[i].name; 1475 1476 return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk); 1477 } 1478 1479 static int qca_serdev_probe(struct serdev_device *serdev) 1480 { 1481 struct qca_serdev *qcadev; 1482 const struct qca_vreg_data *data; 1483 int err; 1484 1485 qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL); 1486 if (!qcadev) 1487 return -ENOMEM; 1488 1489 qcadev->serdev_hu.serdev = serdev; 1490 data = of_device_get_match_data(&serdev->dev); 1491 serdev_device_set_drvdata(serdev, qcadev); 1492 device_property_read_string(&serdev->dev, "firmware-name", 1493 &qcadev->firmware_name); 1494 if (data && qca_is_wcn399x(data->soc_type)) { 1495 qcadev->btsoc_type = data->soc_type; 1496 qcadev->bt_power = devm_kzalloc(&serdev->dev, 1497 sizeof(struct qca_power), 1498 GFP_KERNEL); 1499 if (!qcadev->bt_power) 1500 return -ENOMEM; 1501 1502 qcadev->bt_power->dev = &serdev->dev; 1503 qcadev->bt_power->vreg_data = data; 1504 err = qca_init_regulators(qcadev->bt_power, data->vregs, 1505 data->num_vregs); 1506 if (err) { 1507 BT_ERR("Failed to init regulators:%d", err); 1508 goto out; 1509 } 1510 1511 qcadev->bt_power->vregs_on = false; 1512 1513 device_property_read_u32(&serdev->dev, "max-speed", 1514 &qcadev->oper_speed); 1515 if (!qcadev->oper_speed) 1516 BT_DBG("UART will pick default operating speed"); 1517 1518 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); 1519 if (err) { 1520 BT_ERR("wcn3990 serdev registration failed"); 1521 goto out; 1522 } 1523 } else { 1524 qcadev->btsoc_type = QCA_ROME; 1525 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable", 1526 GPIOD_OUT_LOW); 1527 if (IS_ERR(qcadev->bt_en)) { 1528 dev_err(&serdev->dev, "failed to acquire enable gpio\n"); 1529 return PTR_ERR(qcadev->bt_en); 1530 } 1531 1532 qcadev->susclk = devm_clk_get(&serdev->dev, NULL); 1533 if (IS_ERR(qcadev->susclk)) { 1534 dev_err(&serdev->dev, "failed to acquire clk\n"); 1535 return PTR_ERR(qcadev->susclk); 1536 } 1537 1538 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ); 1539 if (err) 1540 return err; 1541 1542 err = clk_prepare_enable(qcadev->susclk); 1543 if (err) 1544 return err; 1545 1546 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); 1547 if (err) 1548 clk_disable_unprepare(qcadev->susclk); 1549 } 1550 1551 out: return err; 1552 1553 } 1554 1555 static void qca_serdev_remove(struct serdev_device *serdev) 1556 { 1557 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); 1558 1559 if (qca_is_wcn399x(qcadev->btsoc_type)) 1560 qca_power_shutdown(&qcadev->serdev_hu); 1561 else 1562 clk_disable_unprepare(qcadev->susclk); 1563 1564 hci_uart_unregister_device(&qcadev->serdev_hu); 1565 } 1566 1567 static const struct of_device_id qca_bluetooth_of_match[] = { 1568 { .compatible = "qcom,qca6174-bt" }, 1569 { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990}, 1570 { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998}, 1571 { /* sentinel */ } 1572 }; 1573 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match); 1574 1575 static struct serdev_device_driver qca_serdev_driver = { 1576 .probe = qca_serdev_probe, 1577 .remove = qca_serdev_remove, 1578 .driver = { 1579 .name = "hci_uart_qca", 1580 .of_match_table = qca_bluetooth_of_match, 1581 }, 1582 }; 1583 1584 int __init qca_init(void) 1585 { 1586 serdev_device_driver_register(&qca_serdev_driver); 1587 1588 return hci_uart_register_proto(&qca_proto); 1589 } 1590 1591 int __exit qca_deinit(void) 1592 { 1593 serdev_device_driver_unregister(&qca_serdev_driver); 1594 1595 return hci_uart_unregister_proto(&qca_proto); 1596 } 1597