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; 312 313 BT_DBG("hu %p wq awake device", hu); 314 315 /* Vote for serial clock */ 316 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu); 317 318 spin_lock(&qca->hci_ibs_lock); 319 320 /* Send wake indication to device */ 321 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) 322 BT_ERR("Failed to send WAKE to device"); 323 324 qca->ibs_sent_wakes++; 325 326 /* Start retransmit timer */ 327 retrans_delay = msecs_to_jiffies(qca->wake_retrans); 328 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); 329 330 spin_unlock(&qca->hci_ibs_lock); 331 332 /* Actually send the packets */ 333 hci_uart_tx_wakeup(hu); 334 } 335 336 static void qca_wq_awake_rx(struct work_struct *work) 337 { 338 struct qca_data *qca = container_of(work, struct qca_data, 339 ws_awake_rx); 340 struct hci_uart *hu = qca->hu; 341 342 BT_DBG("hu %p wq awake rx", hu); 343 344 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu); 345 346 spin_lock(&qca->hci_ibs_lock); 347 qca->rx_ibs_state = HCI_IBS_RX_AWAKE; 348 349 /* Always acknowledge device wake up, 350 * sending IBS message doesn't count as TX ON. 351 */ 352 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) 353 BT_ERR("Failed to acknowledge device wake up"); 354 355 qca->ibs_sent_wacks++; 356 357 spin_unlock(&qca->hci_ibs_lock); 358 359 /* Actually send the packets */ 360 hci_uart_tx_wakeup(hu); 361 } 362 363 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work) 364 { 365 struct qca_data *qca = container_of(work, struct qca_data, 366 ws_rx_vote_off); 367 struct hci_uart *hu = qca->hu; 368 369 BT_DBG("hu %p rx clock vote off", hu); 370 371 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu); 372 } 373 374 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work) 375 { 376 struct qca_data *qca = container_of(work, struct qca_data, 377 ws_tx_vote_off); 378 struct hci_uart *hu = qca->hu; 379 380 BT_DBG("hu %p tx clock vote off", hu); 381 382 /* Run HCI tx handling unlocked */ 383 hci_uart_tx_wakeup(hu); 384 385 /* Now that message queued to tty driver, vote for tty clocks off. 386 * It is up to the tty driver to pend the clocks off until tx done. 387 */ 388 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu); 389 } 390 391 static void hci_ibs_tx_idle_timeout(struct timer_list *t) 392 { 393 struct qca_data *qca = from_timer(qca, t, tx_idle_timer); 394 struct hci_uart *hu = qca->hu; 395 unsigned long flags; 396 397 BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state); 398 399 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 400 flags, SINGLE_DEPTH_NESTING); 401 402 switch (qca->tx_ibs_state) { 403 case HCI_IBS_TX_AWAKE: 404 /* TX_IDLE, go to SLEEP */ 405 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) { 406 BT_ERR("Failed to send SLEEP to device"); 407 break; 408 } 409 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 410 qca->ibs_sent_slps++; 411 queue_work(qca->workqueue, &qca->ws_tx_vote_off); 412 break; 413 414 case HCI_IBS_TX_ASLEEP: 415 case HCI_IBS_TX_WAKING: 416 /* Fall through */ 417 418 default: 419 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state); 420 break; 421 } 422 423 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 424 } 425 426 static void hci_ibs_wake_retrans_timeout(struct timer_list *t) 427 { 428 struct qca_data *qca = from_timer(qca, t, wake_retrans_timer); 429 struct hci_uart *hu = qca->hu; 430 unsigned long flags, retrans_delay; 431 bool retransmit = false; 432 433 BT_DBG("hu %p wake retransmit timeout in %d state", 434 hu, qca->tx_ibs_state); 435 436 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 437 flags, SINGLE_DEPTH_NESTING); 438 439 switch (qca->tx_ibs_state) { 440 case HCI_IBS_TX_WAKING: 441 /* No WAKE_ACK, retransmit WAKE */ 442 retransmit = true; 443 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) { 444 BT_ERR("Failed to acknowledge device wake up"); 445 break; 446 } 447 qca->ibs_sent_wakes++; 448 retrans_delay = msecs_to_jiffies(qca->wake_retrans); 449 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); 450 break; 451 452 case HCI_IBS_TX_ASLEEP: 453 case HCI_IBS_TX_AWAKE: 454 /* Fall through */ 455 456 default: 457 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state); 458 break; 459 } 460 461 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 462 463 if (retransmit) 464 hci_uart_tx_wakeup(hu); 465 } 466 467 /* Initialize protocol */ 468 static int qca_open(struct hci_uart *hu) 469 { 470 struct qca_serdev *qcadev; 471 struct qca_data *qca; 472 int ret; 473 474 BT_DBG("hu %p qca_open", hu); 475 476 qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL); 477 if (!qca) 478 return -ENOMEM; 479 480 skb_queue_head_init(&qca->txq); 481 skb_queue_head_init(&qca->tx_wait_q); 482 spin_lock_init(&qca->hci_ibs_lock); 483 qca->workqueue = alloc_ordered_workqueue("qca_wq", 0); 484 if (!qca->workqueue) { 485 BT_ERR("QCA Workqueue not initialized properly"); 486 kfree(qca); 487 return -ENOMEM; 488 } 489 490 INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx); 491 INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device); 492 INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off); 493 INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off); 494 495 qca->hu = hu; 496 init_completion(&qca->drop_ev_comp); 497 498 /* Assume we start with both sides asleep -- extra wakes OK */ 499 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 500 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; 501 502 /* clocks actually on, but we start votes off */ 503 qca->tx_vote = false; 504 qca->rx_vote = false; 505 qca->flags = 0; 506 507 qca->ibs_sent_wacks = 0; 508 qca->ibs_sent_slps = 0; 509 qca->ibs_sent_wakes = 0; 510 qca->ibs_recv_wacks = 0; 511 qca->ibs_recv_slps = 0; 512 qca->ibs_recv_wakes = 0; 513 qca->vote_last_jif = jiffies; 514 qca->vote_on_ms = 0; 515 qca->vote_off_ms = 0; 516 qca->votes_on = 0; 517 qca->votes_off = 0; 518 qca->tx_votes_on = 0; 519 qca->tx_votes_off = 0; 520 qca->rx_votes_on = 0; 521 qca->rx_votes_off = 0; 522 523 hu->priv = qca; 524 525 if (hu->serdev) { 526 527 qcadev = serdev_device_get_drvdata(hu->serdev); 528 if (!qca_is_wcn399x(qcadev->btsoc_type)) { 529 gpiod_set_value_cansleep(qcadev->bt_en, 1); 530 /* Controller needs time to bootup. */ 531 msleep(150); 532 } else { 533 hu->init_speed = qcadev->init_speed; 534 hu->oper_speed = qcadev->oper_speed; 535 ret = qca_power_setup(hu, true); 536 if (ret) { 537 destroy_workqueue(qca->workqueue); 538 kfree_skb(qca->rx_skb); 539 hu->priv = NULL; 540 kfree(qca); 541 return ret; 542 } 543 } 544 } 545 546 timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0); 547 qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS; 548 549 timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0); 550 qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS; 551 552 BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u", 553 qca->tx_idle_delay, qca->wake_retrans); 554 555 return 0; 556 } 557 558 static void qca_debugfs_init(struct hci_dev *hdev) 559 { 560 struct hci_uart *hu = hci_get_drvdata(hdev); 561 struct qca_data *qca = hu->priv; 562 struct dentry *ibs_dir; 563 umode_t mode; 564 565 if (!hdev->debugfs) 566 return; 567 568 ibs_dir = debugfs_create_dir("ibs", hdev->debugfs); 569 570 /* read only */ 571 mode = S_IRUGO; 572 debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state); 573 debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state); 574 debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir, 575 &qca->ibs_sent_slps); 576 debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir, 577 &qca->ibs_sent_wakes); 578 debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir, 579 &qca->ibs_sent_wacks); 580 debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir, 581 &qca->ibs_recv_slps); 582 debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir, 583 &qca->ibs_recv_wakes); 584 debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir, 585 &qca->ibs_recv_wacks); 586 debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote); 587 debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on); 588 debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off); 589 debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote); 590 debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on); 591 debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off); 592 debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on); 593 debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off); 594 debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms); 595 debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms); 596 597 /* read/write */ 598 mode = S_IRUGO | S_IWUSR; 599 debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans); 600 debugfs_create_u32("tx_idle_delay", mode, ibs_dir, 601 &qca->tx_idle_delay); 602 } 603 604 /* Flush protocol data */ 605 static int qca_flush(struct hci_uart *hu) 606 { 607 struct qca_data *qca = hu->priv; 608 609 BT_DBG("hu %p qca flush", hu); 610 611 skb_queue_purge(&qca->tx_wait_q); 612 skb_queue_purge(&qca->txq); 613 614 return 0; 615 } 616 617 /* Close protocol */ 618 static int qca_close(struct hci_uart *hu) 619 { 620 struct qca_serdev *qcadev; 621 struct qca_data *qca = hu->priv; 622 623 BT_DBG("hu %p qca close", hu); 624 625 serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu); 626 627 skb_queue_purge(&qca->tx_wait_q); 628 skb_queue_purge(&qca->txq); 629 del_timer(&qca->tx_idle_timer); 630 del_timer(&qca->wake_retrans_timer); 631 destroy_workqueue(qca->workqueue); 632 qca->hu = NULL; 633 634 if (hu->serdev) { 635 qcadev = serdev_device_get_drvdata(hu->serdev); 636 if (qca_is_wcn399x(qcadev->btsoc_type)) 637 qca_power_shutdown(hu); 638 else 639 gpiod_set_value_cansleep(qcadev->bt_en, 0); 640 641 } 642 643 kfree_skb(qca->rx_skb); 644 645 hu->priv = NULL; 646 647 kfree(qca); 648 649 return 0; 650 } 651 652 /* Called upon a wake-up-indication from the device. 653 */ 654 static void device_want_to_wakeup(struct hci_uart *hu) 655 { 656 unsigned long flags; 657 struct qca_data *qca = hu->priv; 658 659 BT_DBG("hu %p want to wake up", hu); 660 661 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 662 663 qca->ibs_recv_wakes++; 664 665 switch (qca->rx_ibs_state) { 666 case HCI_IBS_RX_ASLEEP: 667 /* Make sure clock is on - we may have turned clock off since 668 * receiving the wake up indicator awake rx clock. 669 */ 670 queue_work(qca->workqueue, &qca->ws_awake_rx); 671 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 672 return; 673 674 case HCI_IBS_RX_AWAKE: 675 /* Always acknowledge device wake up, 676 * sending IBS message doesn't count as TX ON. 677 */ 678 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) { 679 BT_ERR("Failed to acknowledge device wake up"); 680 break; 681 } 682 qca->ibs_sent_wacks++; 683 break; 684 685 default: 686 /* Any other state is illegal */ 687 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d", 688 qca->rx_ibs_state); 689 break; 690 } 691 692 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 693 694 /* Actually send the packets */ 695 hci_uart_tx_wakeup(hu); 696 } 697 698 /* Called upon a sleep-indication from the device. 699 */ 700 static void device_want_to_sleep(struct hci_uart *hu) 701 { 702 unsigned long flags; 703 struct qca_data *qca = hu->priv; 704 705 BT_DBG("hu %p want to sleep", hu); 706 707 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 708 709 qca->ibs_recv_slps++; 710 711 switch (qca->rx_ibs_state) { 712 case HCI_IBS_RX_AWAKE: 713 /* Update state */ 714 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; 715 /* Vote off rx clock under workqueue */ 716 queue_work(qca->workqueue, &qca->ws_rx_vote_off); 717 break; 718 719 case HCI_IBS_RX_ASLEEP: 720 /* Fall through */ 721 722 default: 723 /* Any other state is illegal */ 724 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d", 725 qca->rx_ibs_state); 726 break; 727 } 728 729 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 730 } 731 732 /* Called upon wake-up-acknowledgement from the device 733 */ 734 static void device_woke_up(struct hci_uart *hu) 735 { 736 unsigned long flags, idle_delay; 737 struct qca_data *qca = hu->priv; 738 struct sk_buff *skb = NULL; 739 740 BT_DBG("hu %p woke up", hu); 741 742 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 743 744 qca->ibs_recv_wacks++; 745 746 switch (qca->tx_ibs_state) { 747 case HCI_IBS_TX_AWAKE: 748 /* Expect one if we send 2 WAKEs */ 749 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d", 750 qca->tx_ibs_state); 751 break; 752 753 case HCI_IBS_TX_WAKING: 754 /* Send pending packets */ 755 while ((skb = skb_dequeue(&qca->tx_wait_q))) 756 skb_queue_tail(&qca->txq, skb); 757 758 /* Switch timers and change state to HCI_IBS_TX_AWAKE */ 759 del_timer(&qca->wake_retrans_timer); 760 idle_delay = msecs_to_jiffies(qca->tx_idle_delay); 761 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); 762 qca->tx_ibs_state = HCI_IBS_TX_AWAKE; 763 break; 764 765 case HCI_IBS_TX_ASLEEP: 766 /* Fall through */ 767 768 default: 769 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d", 770 qca->tx_ibs_state); 771 break; 772 } 773 774 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 775 776 /* Actually send the packets */ 777 hci_uart_tx_wakeup(hu); 778 } 779 780 /* Enqueue frame for transmittion (padding, crc, etc) may be called from 781 * two simultaneous tasklets. 782 */ 783 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb) 784 { 785 unsigned long flags = 0, idle_delay; 786 struct qca_data *qca = hu->priv; 787 788 BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb, 789 qca->tx_ibs_state); 790 791 /* Prepend skb with frame type */ 792 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 793 794 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 795 796 /* Don't go to sleep in middle of patch download or 797 * Out-Of-Band(GPIOs control) sleep is selected. 798 */ 799 if (!test_bit(QCA_IBS_ENABLED, &qca->flags)) { 800 skb_queue_tail(&qca->txq, skb); 801 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 802 return 0; 803 } 804 805 /* Act according to current state */ 806 switch (qca->tx_ibs_state) { 807 case HCI_IBS_TX_AWAKE: 808 BT_DBG("Device awake, sending normally"); 809 skb_queue_tail(&qca->txq, skb); 810 idle_delay = msecs_to_jiffies(qca->tx_idle_delay); 811 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); 812 break; 813 814 case HCI_IBS_TX_ASLEEP: 815 BT_DBG("Device asleep, waking up and queueing packet"); 816 /* Save packet for later */ 817 skb_queue_tail(&qca->tx_wait_q, skb); 818 819 qca->tx_ibs_state = HCI_IBS_TX_WAKING; 820 /* Schedule a work queue to wake up device */ 821 queue_work(qca->workqueue, &qca->ws_awake_device); 822 break; 823 824 case HCI_IBS_TX_WAKING: 825 BT_DBG("Device waking up, queueing packet"); 826 /* Transient state; just keep packet for later */ 827 skb_queue_tail(&qca->tx_wait_q, skb); 828 break; 829 830 default: 831 BT_ERR("Illegal tx state: %d (losing packet)", 832 qca->tx_ibs_state); 833 kfree_skb(skb); 834 break; 835 } 836 837 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 838 839 return 0; 840 } 841 842 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb) 843 { 844 struct hci_uart *hu = hci_get_drvdata(hdev); 845 846 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND); 847 848 device_want_to_sleep(hu); 849 850 kfree_skb(skb); 851 return 0; 852 } 853 854 static int qca_ibs_wake_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_WAKE_IND); 859 860 device_want_to_wakeup(hu); 861 862 kfree_skb(skb); 863 return 0; 864 } 865 866 static int qca_ibs_wake_ack(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_ACK); 871 872 device_woke_up(hu); 873 874 kfree_skb(skb); 875 return 0; 876 } 877 878 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb) 879 { 880 /* We receive debug logs from chip as an ACL packets. 881 * Instead of sending the data to ACL to decode the 882 * received data, we are pushing them to the above layers 883 * as a diagnostic packet. 884 */ 885 if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE) 886 return hci_recv_diag(hdev, skb); 887 888 return hci_recv_frame(hdev, skb); 889 } 890 891 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb) 892 { 893 struct hci_uart *hu = hci_get_drvdata(hdev); 894 struct qca_data *qca = hu->priv; 895 896 if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) { 897 struct hci_event_hdr *hdr = (void *)skb->data; 898 899 /* For the WCN3990 the vendor command for a baudrate change 900 * isn't sent as synchronous HCI command, because the 901 * controller sends the corresponding vendor event with the 902 * new baudrate. The event is received and properly decoded 903 * after changing the baudrate of the host port. It needs to 904 * be dropped, otherwise it can be misinterpreted as 905 * response to a later firmware download command (also a 906 * vendor command). 907 */ 908 909 if (hdr->evt == HCI_EV_VENDOR) 910 complete(&qca->drop_ev_comp); 911 912 kfree(skb); 913 914 return 0; 915 } 916 917 return hci_recv_frame(hdev, skb); 918 } 919 920 #define QCA_IBS_SLEEP_IND_EVENT \ 921 .type = HCI_IBS_SLEEP_IND, \ 922 .hlen = 0, \ 923 .loff = 0, \ 924 .lsize = 0, \ 925 .maxlen = HCI_MAX_IBS_SIZE 926 927 #define QCA_IBS_WAKE_IND_EVENT \ 928 .type = HCI_IBS_WAKE_IND, \ 929 .hlen = 0, \ 930 .loff = 0, \ 931 .lsize = 0, \ 932 .maxlen = HCI_MAX_IBS_SIZE 933 934 #define QCA_IBS_WAKE_ACK_EVENT \ 935 .type = HCI_IBS_WAKE_ACK, \ 936 .hlen = 0, \ 937 .loff = 0, \ 938 .lsize = 0, \ 939 .maxlen = HCI_MAX_IBS_SIZE 940 941 static const struct h4_recv_pkt qca_recv_pkts[] = { 942 { H4_RECV_ACL, .recv = qca_recv_acl_data }, 943 { H4_RECV_SCO, .recv = hci_recv_frame }, 944 { H4_RECV_EVENT, .recv = qca_recv_event }, 945 { QCA_IBS_WAKE_IND_EVENT, .recv = qca_ibs_wake_ind }, 946 { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_wake_ack }, 947 { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind }, 948 }; 949 950 static int qca_recv(struct hci_uart *hu, const void *data, int count) 951 { 952 struct qca_data *qca = hu->priv; 953 954 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 955 return -EUNATCH; 956 957 qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count, 958 qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts)); 959 if (IS_ERR(qca->rx_skb)) { 960 int err = PTR_ERR(qca->rx_skb); 961 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 962 qca->rx_skb = NULL; 963 return err; 964 } 965 966 return count; 967 } 968 969 static struct sk_buff *qca_dequeue(struct hci_uart *hu) 970 { 971 struct qca_data *qca = hu->priv; 972 973 return skb_dequeue(&qca->txq); 974 } 975 976 static uint8_t qca_get_baudrate_value(int speed) 977 { 978 switch (speed) { 979 case 9600: 980 return QCA_BAUDRATE_9600; 981 case 19200: 982 return QCA_BAUDRATE_19200; 983 case 38400: 984 return QCA_BAUDRATE_38400; 985 case 57600: 986 return QCA_BAUDRATE_57600; 987 case 115200: 988 return QCA_BAUDRATE_115200; 989 case 230400: 990 return QCA_BAUDRATE_230400; 991 case 460800: 992 return QCA_BAUDRATE_460800; 993 case 500000: 994 return QCA_BAUDRATE_500000; 995 case 921600: 996 return QCA_BAUDRATE_921600; 997 case 1000000: 998 return QCA_BAUDRATE_1000000; 999 case 2000000: 1000 return QCA_BAUDRATE_2000000; 1001 case 3000000: 1002 return QCA_BAUDRATE_3000000; 1003 case 3200000: 1004 return QCA_BAUDRATE_3200000; 1005 case 3500000: 1006 return QCA_BAUDRATE_3500000; 1007 default: 1008 return QCA_BAUDRATE_115200; 1009 } 1010 } 1011 1012 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) 1013 { 1014 struct hci_uart *hu = hci_get_drvdata(hdev); 1015 struct qca_data *qca = hu->priv; 1016 struct sk_buff *skb; 1017 u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 }; 1018 1019 if (baudrate > QCA_BAUDRATE_3200000) 1020 return -EINVAL; 1021 1022 cmd[4] = baudrate; 1023 1024 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL); 1025 if (!skb) { 1026 bt_dev_err(hdev, "Failed to allocate baudrate packet"); 1027 return -ENOMEM; 1028 } 1029 1030 /* Assign commands to change baudrate and packet type. */ 1031 skb_put_data(skb, cmd, sizeof(cmd)); 1032 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT; 1033 1034 skb_queue_tail(&qca->txq, skb); 1035 hci_uart_tx_wakeup(hu); 1036 1037 /* Wait for the baudrate change request to be sent */ 1038 1039 while (!skb_queue_empty(&qca->txq)) 1040 usleep_range(100, 200); 1041 1042 if (hu->serdev) 1043 serdev_device_wait_until_sent(hu->serdev, 1044 msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS)); 1045 1046 /* Give the controller time to process the request */ 1047 if (qca_is_wcn399x(qca_soc_type(hu))) 1048 msleep(10); 1049 else 1050 msleep(300); 1051 1052 return 0; 1053 } 1054 1055 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) 1056 { 1057 if (hu->serdev) 1058 serdev_device_set_baudrate(hu->serdev, speed); 1059 else 1060 hci_uart_set_baudrate(hu, speed); 1061 } 1062 1063 static int qca_send_power_pulse(struct hci_uart *hu, bool on) 1064 { 1065 int ret; 1066 int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS); 1067 u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE; 1068 1069 /* These power pulses are single byte command which are sent 1070 * at required baudrate to wcn3990. On wcn3990, we have an external 1071 * circuit at Tx pin which decodes the pulse sent at specific baudrate. 1072 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT 1073 * and also we use the same power inputs to turn on and off for 1074 * Wi-Fi/BT. Powering up the power sources will not enable BT, until 1075 * we send a power on pulse at 115200 bps. This algorithm will help to 1076 * save power. Disabling hardware flow control is mandatory while 1077 * sending power pulses to SoC. 1078 */ 1079 bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd); 1080 1081 serdev_device_write_flush(hu->serdev); 1082 hci_uart_set_flow_control(hu, true); 1083 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd)); 1084 if (ret < 0) { 1085 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd); 1086 return ret; 1087 } 1088 1089 serdev_device_wait_until_sent(hu->serdev, timeout); 1090 hci_uart_set_flow_control(hu, false); 1091 1092 /* Give to controller time to boot/shutdown */ 1093 if (on) 1094 msleep(100); 1095 else 1096 msleep(10); 1097 1098 return 0; 1099 } 1100 1101 static unsigned int qca_get_speed(struct hci_uart *hu, 1102 enum qca_speed_type speed_type) 1103 { 1104 unsigned int speed = 0; 1105 1106 if (speed_type == QCA_INIT_SPEED) { 1107 if (hu->init_speed) 1108 speed = hu->init_speed; 1109 else if (hu->proto->init_speed) 1110 speed = hu->proto->init_speed; 1111 } else { 1112 if (hu->oper_speed) 1113 speed = hu->oper_speed; 1114 else if (hu->proto->oper_speed) 1115 speed = hu->proto->oper_speed; 1116 } 1117 1118 return speed; 1119 } 1120 1121 static int qca_check_speeds(struct hci_uart *hu) 1122 { 1123 if (qca_is_wcn399x(qca_soc_type(hu))) { 1124 if (!qca_get_speed(hu, QCA_INIT_SPEED) && 1125 !qca_get_speed(hu, QCA_OPER_SPEED)) 1126 return -EINVAL; 1127 } else { 1128 if (!qca_get_speed(hu, QCA_INIT_SPEED) || 1129 !qca_get_speed(hu, QCA_OPER_SPEED)) 1130 return -EINVAL; 1131 } 1132 1133 return 0; 1134 } 1135 1136 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type) 1137 { 1138 unsigned int speed, qca_baudrate; 1139 struct qca_data *qca = hu->priv; 1140 int ret = 0; 1141 1142 if (speed_type == QCA_INIT_SPEED) { 1143 speed = qca_get_speed(hu, QCA_INIT_SPEED); 1144 if (speed) 1145 host_set_baudrate(hu, speed); 1146 } else { 1147 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1148 1149 speed = qca_get_speed(hu, QCA_OPER_SPEED); 1150 if (!speed) 1151 return 0; 1152 1153 /* Disable flow control for wcn3990 to deassert RTS while 1154 * changing the baudrate of chip and host. 1155 */ 1156 if (qca_is_wcn399x(soc_type)) 1157 hci_uart_set_flow_control(hu, true); 1158 1159 if (soc_type == QCA_WCN3990) { 1160 reinit_completion(&qca->drop_ev_comp); 1161 set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags); 1162 } 1163 1164 qca_baudrate = qca_get_baudrate_value(speed); 1165 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed); 1166 ret = qca_set_baudrate(hu->hdev, qca_baudrate); 1167 if (ret) 1168 goto error; 1169 1170 host_set_baudrate(hu, speed); 1171 1172 error: 1173 if (qca_is_wcn399x(soc_type)) 1174 hci_uart_set_flow_control(hu, false); 1175 1176 if (soc_type == QCA_WCN3990) { 1177 /* Wait for the controller to send the vendor event 1178 * for the baudrate change command. 1179 */ 1180 if (!wait_for_completion_timeout(&qca->drop_ev_comp, 1181 msecs_to_jiffies(100))) { 1182 bt_dev_err(hu->hdev, 1183 "Failed to change controller baudrate\n"); 1184 ret = -ETIMEDOUT; 1185 } 1186 1187 clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags); 1188 } 1189 } 1190 1191 return ret; 1192 } 1193 1194 static int qca_wcn3990_init(struct hci_uart *hu) 1195 { 1196 struct qca_serdev *qcadev; 1197 int ret; 1198 1199 /* Check for vregs status, may be hci down has turned 1200 * off the voltage regulator. 1201 */ 1202 qcadev = serdev_device_get_drvdata(hu->serdev); 1203 if (!qcadev->bt_power->vregs_on) { 1204 serdev_device_close(hu->serdev); 1205 ret = qca_power_setup(hu, true); 1206 if (ret) 1207 return ret; 1208 1209 ret = serdev_device_open(hu->serdev); 1210 if (ret) { 1211 bt_dev_err(hu->hdev, "failed to open port"); 1212 return ret; 1213 } 1214 } 1215 1216 /* Forcefully enable wcn3990 to enter in to boot mode. */ 1217 host_set_baudrate(hu, 2400); 1218 ret = qca_send_power_pulse(hu, false); 1219 if (ret) 1220 return ret; 1221 1222 qca_set_speed(hu, QCA_INIT_SPEED); 1223 ret = qca_send_power_pulse(hu, true); 1224 if (ret) 1225 return ret; 1226 1227 /* Now the device is in ready state to communicate with host. 1228 * To sync host with device we need to reopen port. 1229 * Without this, we will have RTS and CTS synchronization 1230 * issues. 1231 */ 1232 serdev_device_close(hu->serdev); 1233 ret = serdev_device_open(hu->serdev); 1234 if (ret) { 1235 bt_dev_err(hu->hdev, "failed to open port"); 1236 return ret; 1237 } 1238 1239 hci_uart_set_flow_control(hu, false); 1240 1241 return 0; 1242 } 1243 1244 static int qca_setup(struct hci_uart *hu) 1245 { 1246 struct hci_dev *hdev = hu->hdev; 1247 struct qca_data *qca = hu->priv; 1248 unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200; 1249 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1250 const char *firmware_name = qca_get_firmware_name(hu); 1251 int ret; 1252 int soc_ver = 0; 1253 1254 ret = qca_check_speeds(hu); 1255 if (ret) 1256 return ret; 1257 1258 /* Patch downloading has to be done without IBS mode */ 1259 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1260 1261 if (qca_is_wcn399x(soc_type)) { 1262 bt_dev_info(hdev, "setting up wcn3990"); 1263 1264 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute 1265 * setup for every hci up. 1266 */ 1267 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); 1268 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks); 1269 hu->hdev->shutdown = qca_power_off; 1270 ret = qca_wcn3990_init(hu); 1271 if (ret) 1272 return ret; 1273 1274 ret = qca_read_soc_version(hdev, &soc_ver); 1275 if (ret) 1276 return ret; 1277 } else { 1278 bt_dev_info(hdev, "ROME setup"); 1279 qca_set_speed(hu, QCA_INIT_SPEED); 1280 } 1281 1282 /* Setup user speed if needed */ 1283 speed = qca_get_speed(hu, QCA_OPER_SPEED); 1284 if (speed) { 1285 ret = qca_set_speed(hu, QCA_OPER_SPEED); 1286 if (ret) 1287 return ret; 1288 1289 qca_baudrate = qca_get_baudrate_value(speed); 1290 } 1291 1292 if (!qca_is_wcn399x(soc_type)) { 1293 /* Get QCA version information */ 1294 ret = qca_read_soc_version(hdev, &soc_ver); 1295 if (ret) 1296 return ret; 1297 } 1298 1299 bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver); 1300 /* Setup patch / NVM configurations */ 1301 ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver, 1302 firmware_name); 1303 if (!ret) { 1304 set_bit(QCA_IBS_ENABLED, &qca->flags); 1305 qca_debugfs_init(hdev); 1306 } else if (ret == -ENOENT) { 1307 /* No patch/nvm-config found, run with original fw/config */ 1308 ret = 0; 1309 } else if (ret == -EAGAIN) { 1310 /* 1311 * Userspace firmware loader will return -EAGAIN in case no 1312 * patch/nvm-config is found, so run with original fw/config. 1313 */ 1314 ret = 0; 1315 } 1316 1317 /* Setup bdaddr */ 1318 if (qca_is_wcn399x(soc_type)) 1319 hu->hdev->set_bdaddr = qca_set_bdaddr; 1320 else 1321 hu->hdev->set_bdaddr = qca_set_bdaddr_rome; 1322 1323 return ret; 1324 } 1325 1326 static struct hci_uart_proto qca_proto = { 1327 .id = HCI_UART_QCA, 1328 .name = "QCA", 1329 .manufacturer = 29, 1330 .init_speed = 115200, 1331 .oper_speed = 3000000, 1332 .open = qca_open, 1333 .close = qca_close, 1334 .flush = qca_flush, 1335 .setup = qca_setup, 1336 .recv = qca_recv, 1337 .enqueue = qca_enqueue, 1338 .dequeue = qca_dequeue, 1339 }; 1340 1341 static const struct qca_vreg_data qca_soc_data_wcn3990 = { 1342 .soc_type = QCA_WCN3990, 1343 .vregs = (struct qca_vreg []) { 1344 { "vddio", 1800000, 1900000, 15000 }, 1345 { "vddxo", 1800000, 1900000, 80000 }, 1346 { "vddrf", 1300000, 1350000, 300000 }, 1347 { "vddch0", 3300000, 3400000, 450000 }, 1348 }, 1349 .num_vregs = 4, 1350 }; 1351 1352 static const struct qca_vreg_data qca_soc_data_wcn3998 = { 1353 .soc_type = QCA_WCN3998, 1354 .vregs = (struct qca_vreg []) { 1355 { "vddio", 1800000, 1900000, 10000 }, 1356 { "vddxo", 1800000, 1900000, 80000 }, 1357 { "vddrf", 1300000, 1352000, 300000 }, 1358 { "vddch0", 3300000, 3300000, 450000 }, 1359 }, 1360 .num_vregs = 4, 1361 }; 1362 1363 static void qca_power_shutdown(struct hci_uart *hu) 1364 { 1365 struct qca_data *qca = hu->priv; 1366 unsigned long flags; 1367 1368 /* From this point we go into power off state. But serial port is 1369 * still open, stop queueing the IBS data and flush all the buffered 1370 * data in skb's. 1371 */ 1372 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 1373 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1374 qca_flush(hu); 1375 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 1376 1377 host_set_baudrate(hu, 2400); 1378 qca_send_power_pulse(hu, false); 1379 qca_power_setup(hu, false); 1380 } 1381 1382 static int qca_power_off(struct hci_dev *hdev) 1383 { 1384 struct hci_uart *hu = hci_get_drvdata(hdev); 1385 1386 qca_power_shutdown(hu); 1387 return 0; 1388 } 1389 1390 static int qca_enable_regulator(struct qca_vreg vregs, 1391 struct regulator *regulator) 1392 { 1393 int ret; 1394 1395 ret = regulator_set_voltage(regulator, vregs.min_uV, 1396 vregs.max_uV); 1397 if (ret) 1398 return ret; 1399 1400 if (vregs.load_uA) 1401 ret = regulator_set_load(regulator, 1402 vregs.load_uA); 1403 1404 if (ret) 1405 return ret; 1406 1407 return regulator_enable(regulator); 1408 1409 } 1410 1411 static void qca_disable_regulator(struct qca_vreg vregs, 1412 struct regulator *regulator) 1413 { 1414 regulator_disable(regulator); 1415 regulator_set_voltage(regulator, 0, vregs.max_uV); 1416 if (vregs.load_uA) 1417 regulator_set_load(regulator, 0); 1418 1419 } 1420 1421 static int qca_power_setup(struct hci_uart *hu, bool on) 1422 { 1423 struct qca_vreg *vregs; 1424 struct regulator_bulk_data *vreg_bulk; 1425 struct qca_serdev *qcadev; 1426 int i, num_vregs, ret = 0; 1427 1428 qcadev = serdev_device_get_drvdata(hu->serdev); 1429 if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data || 1430 !qcadev->bt_power->vreg_bulk) 1431 return -EINVAL; 1432 1433 vregs = qcadev->bt_power->vreg_data->vregs; 1434 vreg_bulk = qcadev->bt_power->vreg_bulk; 1435 num_vregs = qcadev->bt_power->vreg_data->num_vregs; 1436 BT_DBG("on: %d", on); 1437 if (on && !qcadev->bt_power->vregs_on) { 1438 for (i = 0; i < num_vregs; i++) { 1439 ret = qca_enable_regulator(vregs[i], 1440 vreg_bulk[i].consumer); 1441 if (ret) 1442 break; 1443 } 1444 1445 if (ret) { 1446 BT_ERR("failed to enable regulator:%s", vregs[i].name); 1447 /* turn off regulators which are enabled */ 1448 for (i = i - 1; i >= 0; i--) 1449 qca_disable_regulator(vregs[i], 1450 vreg_bulk[i].consumer); 1451 } else { 1452 qcadev->bt_power->vregs_on = true; 1453 } 1454 } else if (!on && qcadev->bt_power->vregs_on) { 1455 /* turn off regulator in reverse order */ 1456 i = qcadev->bt_power->vreg_data->num_vregs - 1; 1457 for ( ; i >= 0; i--) 1458 qca_disable_regulator(vregs[i], vreg_bulk[i].consumer); 1459 1460 qcadev->bt_power->vregs_on = false; 1461 } 1462 1463 return ret; 1464 } 1465 1466 static int qca_init_regulators(struct qca_power *qca, 1467 const struct qca_vreg *vregs, size_t num_vregs) 1468 { 1469 int i; 1470 1471 qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs, 1472 sizeof(struct regulator_bulk_data), 1473 GFP_KERNEL); 1474 if (!qca->vreg_bulk) 1475 return -ENOMEM; 1476 1477 for (i = 0; i < num_vregs; i++) 1478 qca->vreg_bulk[i].supply = vregs[i].name; 1479 1480 return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk); 1481 } 1482 1483 static int qca_serdev_probe(struct serdev_device *serdev) 1484 { 1485 struct qca_serdev *qcadev; 1486 const struct qca_vreg_data *data; 1487 int err; 1488 1489 qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL); 1490 if (!qcadev) 1491 return -ENOMEM; 1492 1493 qcadev->serdev_hu.serdev = serdev; 1494 data = of_device_get_match_data(&serdev->dev); 1495 serdev_device_set_drvdata(serdev, qcadev); 1496 device_property_read_string(&serdev->dev, "firmware-name", 1497 &qcadev->firmware_name); 1498 if (data && qca_is_wcn399x(data->soc_type)) { 1499 qcadev->btsoc_type = data->soc_type; 1500 qcadev->bt_power = devm_kzalloc(&serdev->dev, 1501 sizeof(struct qca_power), 1502 GFP_KERNEL); 1503 if (!qcadev->bt_power) 1504 return -ENOMEM; 1505 1506 qcadev->bt_power->dev = &serdev->dev; 1507 qcadev->bt_power->vreg_data = data; 1508 err = qca_init_regulators(qcadev->bt_power, data->vregs, 1509 data->num_vregs); 1510 if (err) { 1511 BT_ERR("Failed to init regulators:%d", err); 1512 goto out; 1513 } 1514 1515 qcadev->bt_power->vregs_on = false; 1516 1517 device_property_read_u32(&serdev->dev, "max-speed", 1518 &qcadev->oper_speed); 1519 if (!qcadev->oper_speed) 1520 BT_DBG("UART will pick default operating speed"); 1521 1522 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); 1523 if (err) { 1524 BT_ERR("wcn3990 serdev registration failed"); 1525 goto out; 1526 } 1527 } else { 1528 qcadev->btsoc_type = QCA_ROME; 1529 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable", 1530 GPIOD_OUT_LOW); 1531 if (IS_ERR(qcadev->bt_en)) { 1532 dev_err(&serdev->dev, "failed to acquire enable gpio\n"); 1533 return PTR_ERR(qcadev->bt_en); 1534 } 1535 1536 qcadev->susclk = devm_clk_get(&serdev->dev, NULL); 1537 if (IS_ERR(qcadev->susclk)) { 1538 dev_err(&serdev->dev, "failed to acquire clk\n"); 1539 return PTR_ERR(qcadev->susclk); 1540 } 1541 1542 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ); 1543 if (err) 1544 return err; 1545 1546 err = clk_prepare_enable(qcadev->susclk); 1547 if (err) 1548 return err; 1549 1550 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); 1551 if (err) 1552 clk_disable_unprepare(qcadev->susclk); 1553 } 1554 1555 out: return err; 1556 1557 } 1558 1559 static void qca_serdev_remove(struct serdev_device *serdev) 1560 { 1561 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); 1562 1563 if (qca_is_wcn399x(qcadev->btsoc_type)) 1564 qca_power_shutdown(&qcadev->serdev_hu); 1565 else 1566 clk_disable_unprepare(qcadev->susclk); 1567 1568 hci_uart_unregister_device(&qcadev->serdev_hu); 1569 } 1570 1571 static const struct of_device_id qca_bluetooth_of_match[] = { 1572 { .compatible = "qcom,qca6174-bt" }, 1573 { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990}, 1574 { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998}, 1575 { /* sentinel */ } 1576 }; 1577 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match); 1578 1579 static struct serdev_device_driver qca_serdev_driver = { 1580 .probe = qca_serdev_probe, 1581 .remove = qca_serdev_remove, 1582 .driver = { 1583 .name = "hci_uart_qca", 1584 .of_match_table = qca_bluetooth_of_match, 1585 }, 1586 }; 1587 1588 int __init qca_init(void) 1589 { 1590 serdev_device_driver_register(&qca_serdev_driver); 1591 1592 return hci_uart_register_proto(&qca_proto); 1593 } 1594 1595 int __exit qca_deinit(void) 1596 { 1597 serdev_device_driver_unregister(&qca_serdev_driver); 1598 1599 return hci_uart_unregister_proto(&qca_proto); 1600 } 1601