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 *  Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
  11 *
  12 *  Acknowledgements:
  13 *  This file is based on hci_ll.c, which was...
  14 *  Written by Ohad Ben-Cohen <ohad@bencohen.org>
  15 *  which was in turn based on hci_h4.c, which was written
  16 *  by Maxim Krasnyansky and Marcel Holtmann.
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/clk.h>
  21#include <linux/completion.h>
  22#include <linux/debugfs.h>
  23#include <linux/delay.h>
  24#include <linux/devcoredump.h>
  25#include <linux/device.h>
  26#include <linux/gpio/consumer.h>
  27#include <linux/mod_devicetable.h>
  28#include <linux/module.h>
  29#include <linux/of.h>
  30#include <linux/acpi.h>
  31#include <linux/platform_device.h>
  32#include <linux/regulator/consumer.h>
  33#include <linux/serdev.h>
  34#include <linux/mutex.h>
  35#include <asm/unaligned.h>
  36
  37#include <net/bluetooth/bluetooth.h>
  38#include <net/bluetooth/hci_core.h>
  39
  40#include "hci_uart.h"
  41#include "btqca.h"
  42
  43/* HCI_IBS protocol messages */
  44#define HCI_IBS_SLEEP_IND	0xFE
  45#define HCI_IBS_WAKE_IND	0xFD
  46#define HCI_IBS_WAKE_ACK	0xFC
  47#define HCI_MAX_IBS_SIZE	10
  48
  49#define IBS_WAKE_RETRANS_TIMEOUT_MS	100
  50#define IBS_BTSOC_TX_IDLE_TIMEOUT_MS	200
  51#define IBS_HOST_TX_IDLE_TIMEOUT_MS	2000
  52#define CMD_TRANS_TIMEOUT_MS		100
  53#define MEMDUMP_TIMEOUT_MS		8000
  54#define IBS_DISABLE_SSR_TIMEOUT_MS \
  55	(MEMDUMP_TIMEOUT_MS + FW_DOWNLOAD_TIMEOUT_MS)
  56#define FW_DOWNLOAD_TIMEOUT_MS		3000
  57
  58/* susclk rate */
  59#define SUSCLK_RATE_32KHZ	32768
  60
  61/* Controller debug log header */
  62#define QCA_DEBUG_HANDLE	0x2EDC
  63
  64/* max retry count when init fails */
  65#define MAX_INIT_RETRIES 3
  66
  67/* Controller dump header */
  68#define QCA_SSR_DUMP_HANDLE		0x0108
  69#define QCA_DUMP_PACKET_SIZE		255
  70#define QCA_LAST_SEQUENCE_NUM		0xFFFF
  71#define QCA_CRASHBYTE_PACKET_LEN	1096
  72#define QCA_MEMDUMP_BYTE		0xFB
  73
  74enum qca_flags {
  75	QCA_IBS_DISABLED,
  76	QCA_DROP_VENDOR_EVENT,
  77	QCA_SUSPENDING,
  78	QCA_MEMDUMP_COLLECTION,
  79	QCA_HW_ERROR_EVENT,
  80	QCA_SSR_TRIGGERED,
  81	QCA_BT_OFF,
  82	QCA_ROM_FW,
  83	QCA_DEBUGFS_CREATED,
  84};
  85
  86enum qca_capabilities {
  87	QCA_CAP_WIDEBAND_SPEECH = BIT(0),
  88	QCA_CAP_VALID_LE_STATES = BIT(1),
  89};
  90
  91/* HCI_IBS transmit side sleep protocol states */
  92enum tx_ibs_states {
  93	HCI_IBS_TX_ASLEEP,
  94	HCI_IBS_TX_WAKING,
  95	HCI_IBS_TX_AWAKE,
  96};
  97
  98/* HCI_IBS receive side sleep protocol states */
  99enum rx_states {
 100	HCI_IBS_RX_ASLEEP,
 101	HCI_IBS_RX_AWAKE,
 102};
 103
 104/* HCI_IBS transmit and receive side clock state vote */
 105enum hci_ibs_clock_state_vote {
 106	HCI_IBS_VOTE_STATS_UPDATE,
 107	HCI_IBS_TX_VOTE_CLOCK_ON,
 108	HCI_IBS_TX_VOTE_CLOCK_OFF,
 109	HCI_IBS_RX_VOTE_CLOCK_ON,
 110	HCI_IBS_RX_VOTE_CLOCK_OFF,
 111};
 112
 113/* Controller memory dump states */
 114enum qca_memdump_states {
 115	QCA_MEMDUMP_IDLE,
 116	QCA_MEMDUMP_COLLECTING,
 117	QCA_MEMDUMP_COLLECTED,
 118	QCA_MEMDUMP_TIMEOUT,
 119};
 120
 121struct qca_memdump_info {
 
 
 122	u32 current_seq_no;
 123	u32 received_dump;
 124	u32 ram_dump_size;
 125};
 126
 127struct qca_memdump_event_hdr {
 128	__u8    evt;
 129	__u8    plen;
 130	__u16   opcode;
 131	__le16   seq_no;
 132	__u8    reserved;
 133} __packed;
 134
 135
 136struct qca_dump_size {
 137	__le32 dump_size;
 138} __packed;
 139
 140struct qca_data {
 141	struct hci_uart *hu;
 142	struct sk_buff *rx_skb;
 143	struct sk_buff_head txq;
 144	struct sk_buff_head tx_wait_q;	/* HCI_IBS wait queue	*/
 145	struct sk_buff_head rx_memdump_q;	/* Memdump wait queue	*/
 146	spinlock_t hci_ibs_lock;	/* HCI_IBS state lock	*/
 147	u8 tx_ibs_state;	/* HCI_IBS transmit side power state*/
 148	u8 rx_ibs_state;	/* HCI_IBS receive side power state */
 149	bool tx_vote;		/* Clock must be on for TX */
 150	bool rx_vote;		/* Clock must be on for RX */
 151	struct timer_list tx_idle_timer;
 152	u32 tx_idle_delay;
 153	struct timer_list wake_retrans_timer;
 154	u32 wake_retrans;
 155	struct workqueue_struct *workqueue;
 156	struct work_struct ws_awake_rx;
 157	struct work_struct ws_awake_device;
 158	struct work_struct ws_rx_vote_off;
 159	struct work_struct ws_tx_vote_off;
 160	struct work_struct ctrl_memdump_evt;
 161	struct delayed_work ctrl_memdump_timeout;
 162	struct qca_memdump_info *qca_memdump;
 163	unsigned long flags;
 164	struct completion drop_ev_comp;
 165	wait_queue_head_t suspend_wait_q;
 166	enum qca_memdump_states memdump_state;
 167	struct mutex hci_memdump_lock;
 168
 169	u16 fw_version;
 170	u16 controller_id;
 171	/* For debugging purpose */
 172	u64 ibs_sent_wacks;
 173	u64 ibs_sent_slps;
 174	u64 ibs_sent_wakes;
 175	u64 ibs_recv_wacks;
 176	u64 ibs_recv_slps;
 177	u64 ibs_recv_wakes;
 178	u64 vote_last_jif;
 179	u32 vote_on_ms;
 180	u32 vote_off_ms;
 181	u64 tx_votes_on;
 182	u64 rx_votes_on;
 183	u64 tx_votes_off;
 184	u64 rx_votes_off;
 185	u64 votes_on;
 186	u64 votes_off;
 187};
 188
 189enum qca_speed_type {
 190	QCA_INIT_SPEED = 1,
 191	QCA_OPER_SPEED
 192};
 193
 194/*
 195 * Voltage regulator information required for configuring the
 196 * QCA Bluetooth chipset
 197 */
 198struct qca_vreg {
 199	const char *name;
 200	unsigned int load_uA;
 201};
 202
 203struct qca_device_data {
 204	enum qca_btsoc_type soc_type;
 205	struct qca_vreg *vregs;
 206	size_t num_vregs;
 207	uint32_t capabilities;
 208};
 209
 210/*
 211 * Platform data for the QCA Bluetooth power driver.
 212 */
 213struct qca_power {
 214	struct device *dev;
 215	struct regulator_bulk_data *vreg_bulk;
 216	int num_vregs;
 217	bool vregs_on;
 218};
 219
 220struct qca_serdev {
 221	struct hci_uart	 serdev_hu;
 222	struct gpio_desc *bt_en;
 223	struct gpio_desc *sw_ctrl;
 224	struct clk	 *susclk;
 225	enum qca_btsoc_type btsoc_type;
 226	struct qca_power *bt_power;
 227	u32 init_speed;
 228	u32 oper_speed;
 229	const char *firmware_name;
 230};
 231
 232static int qca_regulator_enable(struct qca_serdev *qcadev);
 233static void qca_regulator_disable(struct qca_serdev *qcadev);
 234static void qca_power_shutdown(struct hci_uart *hu);
 235static int qca_power_off(struct hci_dev *hdev);
 236static void qca_controller_memdump(struct work_struct *work);
 237static void qca_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb);
 238
 239static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
 240{
 241	enum qca_btsoc_type soc_type;
 242
 243	if (hu->serdev) {
 244		struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 245
 246		soc_type = qsd->btsoc_type;
 247	} else {
 248		soc_type = QCA_ROME;
 249	}
 250
 251	return soc_type;
 252}
 253
 254static const char *qca_get_firmware_name(struct hci_uart *hu)
 255{
 256	if (hu->serdev) {
 257		struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 258
 259		return qsd->firmware_name;
 260	} else {
 261		return NULL;
 262	}
 263}
 264
 265static void __serial_clock_on(struct tty_struct *tty)
 266{
 267	/* TODO: Some chipset requires to enable UART clock on client
 268	 * side to save power consumption or manual work is required.
 269	 * Please put your code to control UART clock here if needed
 270	 */
 271}
 272
 273static void __serial_clock_off(struct tty_struct *tty)
 274{
 275	/* TODO: Some chipset requires to disable UART clock on client
 276	 * side to save power consumption or manual work is required.
 277	 * Please put your code to control UART clock off here if needed
 278	 */
 279}
 280
 281/* serial_clock_vote needs to be called with the ibs lock held */
 282static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
 283{
 284	struct qca_data *qca = hu->priv;
 285	unsigned int diff;
 286
 287	bool old_vote = (qca->tx_vote | qca->rx_vote);
 288	bool new_vote;
 289
 290	switch (vote) {
 291	case HCI_IBS_VOTE_STATS_UPDATE:
 292		diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 293
 294		if (old_vote)
 295			qca->vote_off_ms += diff;
 296		else
 297			qca->vote_on_ms += diff;
 298		return;
 299
 300	case HCI_IBS_TX_VOTE_CLOCK_ON:
 301		qca->tx_vote = true;
 302		qca->tx_votes_on++;
 303		break;
 304
 305	case HCI_IBS_RX_VOTE_CLOCK_ON:
 306		qca->rx_vote = true;
 307		qca->rx_votes_on++;
 308		break;
 309
 310	case HCI_IBS_TX_VOTE_CLOCK_OFF:
 311		qca->tx_vote = false;
 312		qca->tx_votes_off++;
 313		break;
 314
 315	case HCI_IBS_RX_VOTE_CLOCK_OFF:
 316		qca->rx_vote = false;
 317		qca->rx_votes_off++;
 318		break;
 319
 320	default:
 321		BT_ERR("Voting irregularity");
 322		return;
 323	}
 324
 325	new_vote = qca->rx_vote | qca->tx_vote;
 326
 327	if (new_vote != old_vote) {
 328		if (new_vote)
 329			__serial_clock_on(hu->tty);
 330		else
 331			__serial_clock_off(hu->tty);
 332
 333		BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
 334		       vote ? "true" : "false");
 335
 336		diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 337
 338		if (new_vote) {
 339			qca->votes_on++;
 340			qca->vote_off_ms += diff;
 341		} else {
 342			qca->votes_off++;
 343			qca->vote_on_ms += diff;
 344		}
 345		qca->vote_last_jif = jiffies;
 346	}
 347}
 348
 349/* Builds and sends an HCI_IBS command packet.
 350 * These are very simple packets with only 1 cmd byte.
 351 */
 352static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
 353{
 354	int err = 0;
 355	struct sk_buff *skb = NULL;
 356	struct qca_data *qca = hu->priv;
 357
 358	BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
 359
 360	skb = bt_skb_alloc(1, GFP_ATOMIC);
 361	if (!skb) {
 362		BT_ERR("Failed to allocate memory for HCI_IBS packet");
 363		return -ENOMEM;
 364	}
 365
 366	/* Assign HCI_IBS type */
 367	skb_put_u8(skb, cmd);
 368
 369	skb_queue_tail(&qca->txq, skb);
 370
 371	return err;
 372}
 373
 374static void qca_wq_awake_device(struct work_struct *work)
 375{
 376	struct qca_data *qca = container_of(work, struct qca_data,
 377					    ws_awake_device);
 378	struct hci_uart *hu = qca->hu;
 379	unsigned long retrans_delay;
 380	unsigned long flags;
 381
 382	BT_DBG("hu %p wq awake device", hu);
 383
 384	/* Vote for serial clock */
 385	serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
 386
 387	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 388
 389	/* Send wake indication to device */
 390	if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
 391		BT_ERR("Failed to send WAKE to device");
 392
 393	qca->ibs_sent_wakes++;
 394
 395	/* Start retransmit timer */
 396	retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 397	mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 398
 399	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 400
 401	/* Actually send the packets */
 402	hci_uart_tx_wakeup(hu);
 403}
 404
 405static void qca_wq_awake_rx(struct work_struct *work)
 406{
 407	struct qca_data *qca = container_of(work, struct qca_data,
 408					    ws_awake_rx);
 409	struct hci_uart *hu = qca->hu;
 410	unsigned long flags;
 411
 412	BT_DBG("hu %p wq awake rx", hu);
 413
 414	serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
 415
 416	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 417	qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
 418
 419	/* Always acknowledge device wake up,
 420	 * sending IBS message doesn't count as TX ON.
 421	 */
 422	if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
 423		BT_ERR("Failed to acknowledge device wake up");
 424
 425	qca->ibs_sent_wacks++;
 426
 427	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 428
 429	/* Actually send the packets */
 430	hci_uart_tx_wakeup(hu);
 431}
 432
 433static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
 434{
 435	struct qca_data *qca = container_of(work, struct qca_data,
 436					    ws_rx_vote_off);
 437	struct hci_uart *hu = qca->hu;
 438
 439	BT_DBG("hu %p rx clock vote off", hu);
 440
 441	serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
 442}
 443
 444static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
 445{
 446	struct qca_data *qca = container_of(work, struct qca_data,
 447					    ws_tx_vote_off);
 448	struct hci_uart *hu = qca->hu;
 449
 450	BT_DBG("hu %p tx clock vote off", hu);
 451
 452	/* Run HCI tx handling unlocked */
 453	hci_uart_tx_wakeup(hu);
 454
 455	/* Now that message queued to tty driver, vote for tty clocks off.
 456	 * It is up to the tty driver to pend the clocks off until tx done.
 457	 */
 458	serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
 459}
 460
 461static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 462{
 463	struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 464	struct hci_uart *hu = qca->hu;
 465	unsigned long flags;
 466
 467	BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
 468
 469	spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 470				 flags, SINGLE_DEPTH_NESTING);
 471
 472	switch (qca->tx_ibs_state) {
 473	case HCI_IBS_TX_AWAKE:
 474		/* TX_IDLE, go to SLEEP */
 475		if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
 476			BT_ERR("Failed to send SLEEP to device");
 477			break;
 478		}
 479		qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 480		qca->ibs_sent_slps++;
 481		queue_work(qca->workqueue, &qca->ws_tx_vote_off);
 482		break;
 483
 484	case HCI_IBS_TX_ASLEEP:
 485	case HCI_IBS_TX_WAKING:
 486	default:
 487		BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 488		break;
 489	}
 490
 491	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 492}
 493
 494static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 495{
 496	struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
 497	struct hci_uart *hu = qca->hu;
 498	unsigned long flags, retrans_delay;
 499	bool retransmit = false;
 500
 501	BT_DBG("hu %p wake retransmit timeout in %d state",
 502		hu, qca->tx_ibs_state);
 503
 504	spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 505				 flags, SINGLE_DEPTH_NESTING);
 506
 507	/* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */
 508	if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 509		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 510		return;
 511	}
 512
 513	switch (qca->tx_ibs_state) {
 514	case HCI_IBS_TX_WAKING:
 515		/* No WAKE_ACK, retransmit WAKE */
 516		retransmit = true;
 517		if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
 518			BT_ERR("Failed to acknowledge device wake up");
 519			break;
 520		}
 521		qca->ibs_sent_wakes++;
 522		retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 523		mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 524		break;
 525
 526	case HCI_IBS_TX_ASLEEP:
 527	case HCI_IBS_TX_AWAKE:
 528	default:
 529		BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 530		break;
 531	}
 532
 533	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 534
 535	if (retransmit)
 536		hci_uart_tx_wakeup(hu);
 537}
 538
 539
 540static void qca_controller_memdump_timeout(struct work_struct *work)
 541{
 542	struct qca_data *qca = container_of(work, struct qca_data,
 543					ctrl_memdump_timeout.work);
 544	struct hci_uart *hu = qca->hu;
 545
 546	mutex_lock(&qca->hci_memdump_lock);
 547	if (test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
 548		qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
 549		if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
 550			/* Inject hw error event to reset the device
 551			 * and driver.
 552			 */
 553			hci_reset_dev(hu->hdev);
 554		}
 555	}
 556
 557	mutex_unlock(&qca->hci_memdump_lock);
 558}
 559
 560
 561/* Initialize protocol */
 562static int qca_open(struct hci_uart *hu)
 563{
 564	struct qca_serdev *qcadev;
 565	struct qca_data *qca;
 566
 567	BT_DBG("hu %p qca_open", hu);
 568
 569	if (!hci_uart_has_flow_control(hu))
 570		return -EOPNOTSUPP;
 571
 572	qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 573	if (!qca)
 574		return -ENOMEM;
 575
 576	skb_queue_head_init(&qca->txq);
 577	skb_queue_head_init(&qca->tx_wait_q);
 578	skb_queue_head_init(&qca->rx_memdump_q);
 579	spin_lock_init(&qca->hci_ibs_lock);
 580	mutex_init(&qca->hci_memdump_lock);
 581	qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 582	if (!qca->workqueue) {
 583		BT_ERR("QCA Workqueue not initialized properly");
 584		kfree(qca);
 585		return -ENOMEM;
 586	}
 587
 588	INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 589	INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 590	INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 591	INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 592	INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
 593	INIT_DELAYED_WORK(&qca->ctrl_memdump_timeout,
 594			  qca_controller_memdump_timeout);
 595	init_waitqueue_head(&qca->suspend_wait_q);
 596
 597	qca->hu = hu;
 598	init_completion(&qca->drop_ev_comp);
 599
 600	/* Assume we start with both sides asleep -- extra wakes OK */
 601	qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 602	qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 603
 604	qca->vote_last_jif = jiffies;
 605
 606	hu->priv = qca;
 607
 608	if (hu->serdev) {
 609		qcadev = serdev_device_get_drvdata(hu->serdev);
 610
 611		switch (qcadev->btsoc_type) {
 612		case QCA_WCN3988:
 613		case QCA_WCN3990:
 614		case QCA_WCN3991:
 615		case QCA_WCN3998:
 616		case QCA_WCN6750:
 617			hu->init_speed = qcadev->init_speed;
 618			break;
 619
 620		default:
 621			break;
 622		}
 623
 624		if (qcadev->oper_speed)
 625			hu->oper_speed = qcadev->oper_speed;
 626	}
 627
 628	timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 629	qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 630
 631	timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 632	qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS;
 633
 634	BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 635	       qca->tx_idle_delay, qca->wake_retrans);
 636
 637	return 0;
 638}
 639
 640static void qca_debugfs_init(struct hci_dev *hdev)
 641{
 642	struct hci_uart *hu = hci_get_drvdata(hdev);
 643	struct qca_data *qca = hu->priv;
 644	struct dentry *ibs_dir;
 645	umode_t mode;
 646
 647	if (!hdev->debugfs)
 648		return;
 649
 650	if (test_and_set_bit(QCA_DEBUGFS_CREATED, &qca->flags))
 651		return;
 652
 653	ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 654
 655	/* read only */
 656	mode = 0444;
 657	debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 658	debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 659	debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 660			   &qca->ibs_sent_slps);
 661	debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 662			   &qca->ibs_sent_wakes);
 663	debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 664			   &qca->ibs_sent_wacks);
 665	debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 666			   &qca->ibs_recv_slps);
 667	debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 668			   &qca->ibs_recv_wakes);
 669	debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 670			   &qca->ibs_recv_wacks);
 671	debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 672	debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 673	debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 674	debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 675	debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 676	debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 677	debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 678	debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 679	debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 680	debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 681
 682	/* read/write */
 683	mode = 0644;
 684	debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 685	debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 686			   &qca->tx_idle_delay);
 687}
 688
 689/* Flush protocol data */
 690static int qca_flush(struct hci_uart *hu)
 691{
 692	struct qca_data *qca = hu->priv;
 693
 694	BT_DBG("hu %p qca flush", hu);
 695
 696	skb_queue_purge(&qca->tx_wait_q);
 697	skb_queue_purge(&qca->txq);
 698
 699	return 0;
 700}
 701
 702/* Close protocol */
 703static int qca_close(struct hci_uart *hu)
 704{
 705	struct qca_data *qca = hu->priv;
 706
 707	BT_DBG("hu %p qca close", hu);
 708
 709	serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 710
 711	skb_queue_purge(&qca->tx_wait_q);
 712	skb_queue_purge(&qca->txq);
 713	skb_queue_purge(&qca->rx_memdump_q);
 714	/*
 715	 * Shut the timers down so they can't be rearmed when
 716	 * destroy_workqueue() drains pending work which in turn might try
 717	 * to arm a timer.  After shutdown rearm attempts are silently
 718	 * ignored by the timer core code.
 719	 */
 720	timer_shutdown_sync(&qca->tx_idle_timer);
 721	timer_shutdown_sync(&qca->wake_retrans_timer);
 722	destroy_workqueue(qca->workqueue);
 723	qca->hu = NULL;
 724
 725	kfree_skb(qca->rx_skb);
 726
 727	hu->priv = NULL;
 728
 729	kfree(qca);
 730
 731	return 0;
 732}
 733
 734/* Called upon a wake-up-indication from the device.
 735 */
 736static void device_want_to_wakeup(struct hci_uart *hu)
 737{
 738	unsigned long flags;
 739	struct qca_data *qca = hu->priv;
 740
 741	BT_DBG("hu %p want to wake up", hu);
 742
 743	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 744
 745	qca->ibs_recv_wakes++;
 746
 747	/* Don't wake the rx up when suspending. */
 748	if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 749		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 750		return;
 751	}
 752
 753	switch (qca->rx_ibs_state) {
 754	case HCI_IBS_RX_ASLEEP:
 755		/* Make sure clock is on - we may have turned clock off since
 756		 * receiving the wake up indicator awake rx clock.
 757		 */
 758		queue_work(qca->workqueue, &qca->ws_awake_rx);
 759		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 760		return;
 761
 762	case HCI_IBS_RX_AWAKE:
 763		/* Always acknowledge device wake up,
 764		 * sending IBS message doesn't count as TX ON.
 765		 */
 766		if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 767			BT_ERR("Failed to acknowledge device wake up");
 768			break;
 769		}
 770		qca->ibs_sent_wacks++;
 771		break;
 772
 773	default:
 774		/* Any other state is illegal */
 775		BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 776		       qca->rx_ibs_state);
 777		break;
 778	}
 779
 780	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 781
 782	/* Actually send the packets */
 783	hci_uart_tx_wakeup(hu);
 784}
 785
 786/* Called upon a sleep-indication from the device.
 787 */
 788static void device_want_to_sleep(struct hci_uart *hu)
 789{
 790	unsigned long flags;
 791	struct qca_data *qca = hu->priv;
 792
 793	BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);
 794
 795	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 796
 797	qca->ibs_recv_slps++;
 798
 799	switch (qca->rx_ibs_state) {
 800	case HCI_IBS_RX_AWAKE:
 801		/* Update state */
 802		qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 803		/* Vote off rx clock under workqueue */
 804		queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 805		break;
 806
 807	case HCI_IBS_RX_ASLEEP:
 808		break;
 809
 810	default:
 811		/* Any other state is illegal */
 812		BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 813		       qca->rx_ibs_state);
 814		break;
 815	}
 816
 817	wake_up_interruptible(&qca->suspend_wait_q);
 818
 819	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 820}
 821
 822/* Called upon wake-up-acknowledgement from the device
 823 */
 824static void device_woke_up(struct hci_uart *hu)
 825{
 826	unsigned long flags, idle_delay;
 827	struct qca_data *qca = hu->priv;
 828	struct sk_buff *skb = NULL;
 829
 830	BT_DBG("hu %p woke up", hu);
 831
 832	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 833
 834	qca->ibs_recv_wacks++;
 835
 836	/* Don't react to the wake-up-acknowledgment when suspending. */
 837	if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 838		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 839		return;
 840	}
 841
 842	switch (qca->tx_ibs_state) {
 843	case HCI_IBS_TX_AWAKE:
 844		/* Expect one if we send 2 WAKEs */
 845		BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 846		       qca->tx_ibs_state);
 847		break;
 848
 849	case HCI_IBS_TX_WAKING:
 850		/* Send pending packets */
 851		while ((skb = skb_dequeue(&qca->tx_wait_q)))
 852			skb_queue_tail(&qca->txq, skb);
 853
 854		/* Switch timers and change state to HCI_IBS_TX_AWAKE */
 855		del_timer(&qca->wake_retrans_timer);
 856		idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 857		mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 858		qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 859		break;
 860
 861	case HCI_IBS_TX_ASLEEP:
 862	default:
 863		BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 864		       qca->tx_ibs_state);
 865		break;
 866	}
 867
 868	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 869
 870	/* Actually send the packets */
 871	hci_uart_tx_wakeup(hu);
 872}
 873
 874/* Enqueue frame for transmittion (padding, crc, etc) may be called from
 875 * two simultaneous tasklets.
 876 */
 877static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 878{
 879	unsigned long flags = 0, idle_delay;
 880	struct qca_data *qca = hu->priv;
 881
 882	BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 883	       qca->tx_ibs_state);
 884
 885	if (test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
 886		/* As SSR is in progress, ignore the packets */
 887		bt_dev_dbg(hu->hdev, "SSR is in progress");
 888		kfree_skb(skb);
 889		return 0;
 890	}
 891
 892	/* Prepend skb with frame type */
 893	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 894
 895	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 896
 897	/* Don't go to sleep in middle of patch download or
 898	 * Out-Of-Band(GPIOs control) sleep is selected.
 899	 * Don't wake the device up when suspending.
 900	 */
 901	if (test_bit(QCA_IBS_DISABLED, &qca->flags) ||
 902	    test_bit(QCA_SUSPENDING, &qca->flags)) {
 903		skb_queue_tail(&qca->txq, skb);
 904		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 905		return 0;
 906	}
 907
 908	/* Act according to current state */
 909	switch (qca->tx_ibs_state) {
 910	case HCI_IBS_TX_AWAKE:
 911		BT_DBG("Device awake, sending normally");
 912		skb_queue_tail(&qca->txq, skb);
 913		idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 914		mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 915		break;
 916
 917	case HCI_IBS_TX_ASLEEP:
 918		BT_DBG("Device asleep, waking up and queueing packet");
 919		/* Save packet for later */
 920		skb_queue_tail(&qca->tx_wait_q, skb);
 921
 922		qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 923		/* Schedule a work queue to wake up device */
 924		queue_work(qca->workqueue, &qca->ws_awake_device);
 925		break;
 926
 927	case HCI_IBS_TX_WAKING:
 928		BT_DBG("Device waking up, queueing packet");
 929		/* Transient state; just keep packet for later */
 930		skb_queue_tail(&qca->tx_wait_q, skb);
 931		break;
 932
 933	default:
 934		BT_ERR("Illegal tx state: %d (losing packet)",
 935		       qca->tx_ibs_state);
 936		dev_kfree_skb_irq(skb);
 937		break;
 938	}
 939
 940	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 941
 942	return 0;
 943}
 944
 945static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 946{
 947	struct hci_uart *hu = hci_get_drvdata(hdev);
 948
 949	BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 950
 951	device_want_to_sleep(hu);
 952
 953	kfree_skb(skb);
 954	return 0;
 955}
 956
 957static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 958{
 959	struct hci_uart *hu = hci_get_drvdata(hdev);
 960
 961	BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 962
 963	device_want_to_wakeup(hu);
 964
 965	kfree_skb(skb);
 966	return 0;
 967}
 968
 969static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 970{
 971	struct hci_uart *hu = hci_get_drvdata(hdev);
 972
 973	BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 974
 975	device_woke_up(hu);
 976
 977	kfree_skb(skb);
 978	return 0;
 979}
 980
 981static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 982{
 983	/* We receive debug logs from chip as an ACL packets.
 984	 * Instead of sending the data to ACL to decode the
 985	 * received data, we are pushing them to the above layers
 986	 * as a diagnostic packet.
 987	 */
 988	if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 989		return hci_recv_diag(hdev, skb);
 990
 991	return hci_recv_frame(hdev, skb);
 992}
 993
 994static void qca_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb)
 995{
 996	struct hci_uart *hu = hci_get_drvdata(hdev);
 997	struct qca_data *qca = hu->priv;
 998	char buf[80];
 999
1000	snprintf(buf, sizeof(buf), "Controller Name: 0x%x\n",
1001		qca->controller_id);
1002	skb_put_data(skb, buf, strlen(buf));
1003
1004	snprintf(buf, sizeof(buf), "Firmware Version: 0x%x\n",
1005		qca->fw_version);
1006	skb_put_data(skb, buf, strlen(buf));
1007
1008	snprintf(buf, sizeof(buf), "Vendor:Qualcomm\n");
1009	skb_put_data(skb, buf, strlen(buf));
1010
1011	snprintf(buf, sizeof(buf), "Driver: %s\n",
1012		hu->serdev->dev.driver->name);
1013	skb_put_data(skb, buf, strlen(buf));
1014}
1015
1016static void qca_controller_memdump(struct work_struct *work)
1017{
1018	struct qca_data *qca = container_of(work, struct qca_data,
1019					    ctrl_memdump_evt);
1020	struct hci_uart *hu = qca->hu;
1021	struct sk_buff *skb;
1022	struct qca_memdump_event_hdr *cmd_hdr;
1023	struct qca_memdump_info *qca_memdump = qca->qca_memdump;
1024	struct qca_dump_size *dump;
 
 
1025	u16 seq_no;
 
1026	u32 rx_size;
1027	int ret = 0;
1028	enum qca_btsoc_type soc_type = qca_soc_type(hu);
1029
1030	while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
1031
1032		mutex_lock(&qca->hci_memdump_lock);
1033		/* Skip processing the received packets if timeout detected
1034		 * or memdump collection completed.
1035		 */
1036		if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
1037		    qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
1038			mutex_unlock(&qca->hci_memdump_lock);
1039			return;
1040		}
1041
1042		if (!qca_memdump) {
1043			qca_memdump = kzalloc(sizeof(struct qca_memdump_info),
1044					      GFP_ATOMIC);
1045			if (!qca_memdump) {
1046				mutex_unlock(&qca->hci_memdump_lock);
1047				return;
1048			}
1049
1050			qca->qca_memdump = qca_memdump;
1051		}
1052
1053		qca->memdump_state = QCA_MEMDUMP_COLLECTING;
1054		cmd_hdr = (void *) skb->data;
1055		seq_no = __le16_to_cpu(cmd_hdr->seq_no);
1056		skb_pull(skb, sizeof(struct qca_memdump_event_hdr));
1057
1058		if (!seq_no) {
1059
1060			/* This is the first frame of memdump packet from
1061			 * the controller, Disable IBS to recevie dump
1062			 * with out any interruption, ideally time required for
1063			 * the controller to send the dump is 8 seconds. let us
1064			 * start timer to handle this asynchronous activity.
1065			 */
1066			set_bit(QCA_IBS_DISABLED, &qca->flags);
1067			set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1068			dump = (void *) skb->data;
1069			qca_memdump->ram_dump_size = __le32_to_cpu(dump->dump_size);
1070			if (!(qca_memdump->ram_dump_size)) {
1071				bt_dev_err(hu->hdev, "Rx invalid memdump size");
1072				kfree(qca_memdump);
1073				kfree_skb(skb);
1074				mutex_unlock(&qca->hci_memdump_lock);
1075				return;
1076			}
1077
1078			queue_delayed_work(qca->workqueue,
1079					   &qca->ctrl_memdump_timeout,
1080					   msecs_to_jiffies(MEMDUMP_TIMEOUT_MS));
1081			skb_pull(skb, sizeof(qca_memdump->ram_dump_size));
1082			qca_memdump->current_seq_no = 0;
1083			qca_memdump->received_dump = 0;
1084			ret = hci_devcd_init(hu->hdev, qca_memdump->ram_dump_size);
1085			bt_dev_info(hu->hdev, "hci_devcd_init Return:%d",
1086				    ret);
1087			if (ret < 0) {
1088				kfree(qca->qca_memdump);
1089				qca->qca_memdump = NULL;
1090				qca->memdump_state = QCA_MEMDUMP_COLLECTED;
1091				cancel_delayed_work(&qca->ctrl_memdump_timeout);
1092				clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1093				mutex_unlock(&qca->hci_memdump_lock);
1094				return;
1095			}
1096
1097			bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
1098				    qca_memdump->ram_dump_size);
 
 
 
 
1099
 
 
 
 
 
1100		}
1101
 
 
1102		/* If sequence no 0 is missed then there is no point in
1103		 * accepting the other sequences.
1104		 */
1105		if (!test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
1106			bt_dev_err(hu->hdev, "QCA: Discarding other packets");
1107			kfree(qca_memdump);
1108			kfree_skb(skb);
 
1109			mutex_unlock(&qca->hci_memdump_lock);
1110			return;
1111		}
 
1112		/* There could be chance of missing some packets from
1113		 * the controller. In such cases let us store the dummy
1114		 * packets in the buffer.
1115		 */
1116		/* For QCA6390, controller does not lost packets but
1117		 * sequence number field of packet sometimes has error
1118		 * bits, so skip this checking for missing packet.
1119		 */
1120		while ((seq_no > qca_memdump->current_seq_no + 1) &&
1121			(soc_type != QCA_QCA6390) &&
1122			seq_no != QCA_LAST_SEQUENCE_NUM) {
1123			bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
1124				   qca_memdump->current_seq_no);
1125			rx_size = qca_memdump->received_dump;
1126			rx_size += QCA_DUMP_PACKET_SIZE;
1127			if (rx_size > qca_memdump->ram_dump_size) {
1128				bt_dev_err(hu->hdev,
1129					   "QCA memdump received %d, no space for missed packet",
1130					   qca_memdump->received_dump);
1131				break;
1132			}
1133			hci_devcd_append_pattern(hu->hdev, 0x00,
1134				QCA_DUMP_PACKET_SIZE);
1135			qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
1136			qca_memdump->current_seq_no++;
1137		}
1138
1139		rx_size = qca_memdump->received_dump  + skb->len;
1140		if (rx_size <= qca_memdump->ram_dump_size) {
1141			if ((seq_no != QCA_LAST_SEQUENCE_NUM) &&
1142			    (seq_no != qca_memdump->current_seq_no)) {
1143				bt_dev_err(hu->hdev,
1144					   "QCA memdump unexpected packet %d",
1145					   seq_no);
1146			}
1147			bt_dev_dbg(hu->hdev,
1148				   "QCA memdump packet %d with length %d",
1149				   seq_no, skb->len);
1150			hci_devcd_append(hu->hdev, skb);
1151			qca_memdump->current_seq_no += 1;
1152			qca_memdump->received_dump = rx_size;
 
 
 
1153		} else {
1154			bt_dev_err(hu->hdev,
1155				   "QCA memdump received no space for packet %d",
1156				    qca_memdump->current_seq_no);
1157		}
1158
 
1159		if (seq_no == QCA_LAST_SEQUENCE_NUM) {
1160			bt_dev_info(hu->hdev,
1161				"QCA memdump Done, received %d, total %d",
1162				qca_memdump->received_dump,
1163				qca_memdump->ram_dump_size);
1164			hci_devcd_complete(hu->hdev);
 
 
1165			cancel_delayed_work(&qca->ctrl_memdump_timeout);
1166			kfree(qca->qca_memdump);
1167			qca->qca_memdump = NULL;
1168			qca->memdump_state = QCA_MEMDUMP_COLLECTED;
1169			clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1170		}
1171
1172		mutex_unlock(&qca->hci_memdump_lock);
1173	}
1174
1175}
1176
1177static int qca_controller_memdump_event(struct hci_dev *hdev,
1178					struct sk_buff *skb)
1179{
1180	struct hci_uart *hu = hci_get_drvdata(hdev);
1181	struct qca_data *qca = hu->priv;
1182
1183	set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1184	skb_queue_tail(&qca->rx_memdump_q, skb);
1185	queue_work(qca->workqueue, &qca->ctrl_memdump_evt);
1186
1187	return 0;
1188}
1189
1190static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
1191{
1192	struct hci_uart *hu = hci_get_drvdata(hdev);
1193	struct qca_data *qca = hu->priv;
1194
1195	if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
1196		struct hci_event_hdr *hdr = (void *)skb->data;
1197
1198		/* For the WCN3990 the vendor command for a baudrate change
1199		 * isn't sent as synchronous HCI command, because the
1200		 * controller sends the corresponding vendor event with the
1201		 * new baudrate. The event is received and properly decoded
1202		 * after changing the baudrate of the host port. It needs to
1203		 * be dropped, otherwise it can be misinterpreted as
1204		 * response to a later firmware download command (also a
1205		 * vendor command).
1206		 */
1207
1208		if (hdr->evt == HCI_EV_VENDOR)
1209			complete(&qca->drop_ev_comp);
1210
1211		kfree_skb(skb);
1212
1213		return 0;
1214	}
1215	/* We receive chip memory dump as an event packet, With a dedicated
1216	 * handler followed by a hardware error event. When this event is
1217	 * received we store dump into a file before closing hci. This
1218	 * dump will help in triaging the issues.
1219	 */
1220	if ((skb->data[0] == HCI_VENDOR_PKT) &&
1221	    (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
1222		return qca_controller_memdump_event(hdev, skb);
1223
1224	return hci_recv_frame(hdev, skb);
1225}
1226
1227#define QCA_IBS_SLEEP_IND_EVENT \
1228	.type = HCI_IBS_SLEEP_IND, \
1229	.hlen = 0, \
1230	.loff = 0, \
1231	.lsize = 0, \
1232	.maxlen = HCI_MAX_IBS_SIZE
1233
1234#define QCA_IBS_WAKE_IND_EVENT \
1235	.type = HCI_IBS_WAKE_IND, \
1236	.hlen = 0, \
1237	.loff = 0, \
1238	.lsize = 0, \
1239	.maxlen = HCI_MAX_IBS_SIZE
1240
1241#define QCA_IBS_WAKE_ACK_EVENT \
1242	.type = HCI_IBS_WAKE_ACK, \
1243	.hlen = 0, \
1244	.loff = 0, \
1245	.lsize = 0, \
1246	.maxlen = HCI_MAX_IBS_SIZE
1247
1248static const struct h4_recv_pkt qca_recv_pkts[] = {
1249	{ H4_RECV_ACL,             .recv = qca_recv_acl_data },
1250	{ H4_RECV_SCO,             .recv = hci_recv_frame    },
1251	{ H4_RECV_EVENT,           .recv = qca_recv_event    },
1252	{ QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
1253	{ QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
1254	{ QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
1255};
1256
1257static int qca_recv(struct hci_uart *hu, const void *data, int count)
1258{
1259	struct qca_data *qca = hu->priv;
1260
1261	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
1262		return -EUNATCH;
1263
1264	qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
1265				  qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
1266	if (IS_ERR(qca->rx_skb)) {
1267		int err = PTR_ERR(qca->rx_skb);
1268		bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
1269		qca->rx_skb = NULL;
1270		return err;
1271	}
1272
1273	return count;
1274}
1275
1276static struct sk_buff *qca_dequeue(struct hci_uart *hu)
1277{
1278	struct qca_data *qca = hu->priv;
1279
1280	return skb_dequeue(&qca->txq);
1281}
1282
1283static uint8_t qca_get_baudrate_value(int speed)
1284{
1285	switch (speed) {
1286	case 9600:
1287		return QCA_BAUDRATE_9600;
1288	case 19200:
1289		return QCA_BAUDRATE_19200;
1290	case 38400:
1291		return QCA_BAUDRATE_38400;
1292	case 57600:
1293		return QCA_BAUDRATE_57600;
1294	case 115200:
1295		return QCA_BAUDRATE_115200;
1296	case 230400:
1297		return QCA_BAUDRATE_230400;
1298	case 460800:
1299		return QCA_BAUDRATE_460800;
1300	case 500000:
1301		return QCA_BAUDRATE_500000;
1302	case 921600:
1303		return QCA_BAUDRATE_921600;
1304	case 1000000:
1305		return QCA_BAUDRATE_1000000;
1306	case 2000000:
1307		return QCA_BAUDRATE_2000000;
1308	case 3000000:
1309		return QCA_BAUDRATE_3000000;
1310	case 3200000:
1311		return QCA_BAUDRATE_3200000;
1312	case 3500000:
1313		return QCA_BAUDRATE_3500000;
1314	default:
1315		return QCA_BAUDRATE_115200;
1316	}
1317}
1318
1319static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
1320{
1321	struct hci_uart *hu = hci_get_drvdata(hdev);
1322	struct qca_data *qca = hu->priv;
1323	struct sk_buff *skb;
1324	u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
1325
1326	if (baudrate > QCA_BAUDRATE_3200000)
1327		return -EINVAL;
1328
1329	cmd[4] = baudrate;
1330
1331	skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1332	if (!skb) {
1333		bt_dev_err(hdev, "Failed to allocate baudrate packet");
1334		return -ENOMEM;
1335	}
1336
1337	/* Assign commands to change baudrate and packet type. */
1338	skb_put_data(skb, cmd, sizeof(cmd));
1339	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1340
1341	skb_queue_tail(&qca->txq, skb);
1342	hci_uart_tx_wakeup(hu);
1343
1344	/* Wait for the baudrate change request to be sent */
1345
1346	while (!skb_queue_empty(&qca->txq))
1347		usleep_range(100, 200);
1348
1349	if (hu->serdev)
1350		serdev_device_wait_until_sent(hu->serdev,
1351		      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1352
1353	/* Give the controller time to process the request */
1354	switch (qca_soc_type(hu)) {
1355	case QCA_WCN3988:
1356	case QCA_WCN3990:
1357	case QCA_WCN3991:
1358	case QCA_WCN3998:
1359	case QCA_WCN6750:
1360	case QCA_WCN6855:
1361	case QCA_WCN7850:
1362		usleep_range(1000, 10000);
1363		break;
1364
1365	default:
1366		msleep(300);
1367	}
1368
1369	return 0;
1370}
1371
1372static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1373{
1374	if (hu->serdev)
1375		serdev_device_set_baudrate(hu->serdev, speed);
1376	else
1377		hci_uart_set_baudrate(hu, speed);
1378}
1379
1380static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1381{
1382	int ret;
1383	int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1384	u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1385
1386	/* These power pulses are single byte command which are sent
1387	 * at required baudrate to wcn3990. On wcn3990, we have an external
1388	 * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1389	 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1390	 * and also we use the same power inputs to turn on and off for
1391	 * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1392	 * we send a power on pulse at 115200 bps. This algorithm will help to
1393	 * save power. Disabling hardware flow control is mandatory while
1394	 * sending power pulses to SoC.
1395	 */
1396	bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1397
1398	serdev_device_write_flush(hu->serdev);
1399	hci_uart_set_flow_control(hu, true);
1400	ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1401	if (ret < 0) {
1402		bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1403		return ret;
1404	}
1405
1406	serdev_device_wait_until_sent(hu->serdev, timeout);
1407	hci_uart_set_flow_control(hu, false);
1408
1409	/* Give to controller time to boot/shutdown */
1410	if (on)
1411		msleep(100);
1412	else
1413		usleep_range(1000, 10000);
1414
1415	return 0;
1416}
1417
1418static unsigned int qca_get_speed(struct hci_uart *hu,
1419				  enum qca_speed_type speed_type)
1420{
1421	unsigned int speed = 0;
1422
1423	if (speed_type == QCA_INIT_SPEED) {
1424		if (hu->init_speed)
1425			speed = hu->init_speed;
1426		else if (hu->proto->init_speed)
1427			speed = hu->proto->init_speed;
1428	} else {
1429		if (hu->oper_speed)
1430			speed = hu->oper_speed;
1431		else if (hu->proto->oper_speed)
1432			speed = hu->proto->oper_speed;
1433	}
1434
1435	return speed;
1436}
1437
1438static int qca_check_speeds(struct hci_uart *hu)
1439{
1440	switch (qca_soc_type(hu)) {
1441	case QCA_WCN3988:
1442	case QCA_WCN3990:
1443	case QCA_WCN3991:
1444	case QCA_WCN3998:
1445	case QCA_WCN6750:
1446	case QCA_WCN6855:
1447	case QCA_WCN7850:
1448		if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1449		    !qca_get_speed(hu, QCA_OPER_SPEED))
1450			return -EINVAL;
1451		break;
1452
1453	default:
1454		if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1455		    !qca_get_speed(hu, QCA_OPER_SPEED))
1456			return -EINVAL;
1457	}
1458
1459	return 0;
1460}
1461
1462static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1463{
1464	unsigned int speed, qca_baudrate;
1465	struct qca_data *qca = hu->priv;
1466	int ret = 0;
1467
1468	if (speed_type == QCA_INIT_SPEED) {
1469		speed = qca_get_speed(hu, QCA_INIT_SPEED);
1470		if (speed)
1471			host_set_baudrate(hu, speed);
1472	} else {
1473		enum qca_btsoc_type soc_type = qca_soc_type(hu);
1474
1475		speed = qca_get_speed(hu, QCA_OPER_SPEED);
1476		if (!speed)
1477			return 0;
1478
1479		/* Disable flow control for wcn3990 to deassert RTS while
1480		 * changing the baudrate of chip and host.
1481		 */
1482		switch (soc_type) {
1483		case QCA_WCN3988:
1484		case QCA_WCN3990:
1485		case QCA_WCN3991:
1486		case QCA_WCN3998:
1487		case QCA_WCN6750:
1488		case QCA_WCN6855:
1489		case QCA_WCN7850:
1490			hci_uart_set_flow_control(hu, true);
1491			break;
1492
1493		default:
1494			break;
1495		}
1496
1497		switch (soc_type) {
1498		case QCA_WCN3990:
1499			reinit_completion(&qca->drop_ev_comp);
1500			set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1501			break;
1502
1503		default:
1504			break;
1505		}
1506
1507		qca_baudrate = qca_get_baudrate_value(speed);
1508		bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1509		ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1510		if (ret)
1511			goto error;
1512
1513		host_set_baudrate(hu, speed);
1514
1515error:
1516		switch (soc_type) {
1517		case QCA_WCN3988:
1518		case QCA_WCN3990:
1519		case QCA_WCN3991:
1520		case QCA_WCN3998:
1521		case QCA_WCN6750:
1522		case QCA_WCN6855:
1523		case QCA_WCN7850:
1524			hci_uart_set_flow_control(hu, false);
1525			break;
1526
1527		default:
1528			break;
1529		}
1530
1531		switch (soc_type) {
1532		case QCA_WCN3990:
1533			/* Wait for the controller to send the vendor event
1534			 * for the baudrate change command.
1535			 */
1536			if (!wait_for_completion_timeout(&qca->drop_ev_comp,
1537						 msecs_to_jiffies(100))) {
1538				bt_dev_err(hu->hdev,
1539					   "Failed to change controller baudrate\n");
1540				ret = -ETIMEDOUT;
1541			}
1542
1543			clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1544			break;
1545
1546		default:
1547			break;
1548		}
1549	}
1550
1551	return ret;
1552}
1553
1554static int qca_send_crashbuffer(struct hci_uart *hu)
1555{
1556	struct qca_data *qca = hu->priv;
1557	struct sk_buff *skb;
1558
1559	skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
1560	if (!skb) {
1561		bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
1562		return -ENOMEM;
1563	}
1564
1565	/* We forcefully crash the controller, by sending 0xfb byte for
1566	 * 1024 times. We also might have chance of losing data, To be
1567	 * on safer side we send 1096 bytes to the SoC.
1568	 */
1569	memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
1570	       QCA_CRASHBYTE_PACKET_LEN);
1571	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1572	bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
1573	skb_queue_tail(&qca->txq, skb);
1574	hci_uart_tx_wakeup(hu);
1575
1576	return 0;
1577}
1578
1579static void qca_wait_for_dump_collection(struct hci_dev *hdev)
1580{
1581	struct hci_uart *hu = hci_get_drvdata(hdev);
1582	struct qca_data *qca = hu->priv;
1583
1584	wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
1585			    TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);
1586
1587	clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1588}
1589
1590static void qca_hw_error(struct hci_dev *hdev, u8 code)
1591{
1592	struct hci_uart *hu = hci_get_drvdata(hdev);
1593	struct qca_data *qca = hu->priv;
1594
1595	set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1596	set_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1597	bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);
1598
1599	if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1600		/* If hardware error event received for other than QCA
1601		 * soc memory dump event, then we need to crash the SOC
1602		 * and wait here for 8 seconds to get the dump packets.
1603		 * This will block main thread to be on hold until we
1604		 * collect dump.
1605		 */
1606		set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1607		qca_send_crashbuffer(hu);
1608		qca_wait_for_dump_collection(hdev);
1609	} else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1610		/* Let us wait here until memory dump collected or
1611		 * memory dump timer expired.
1612		 */
1613		bt_dev_info(hdev, "waiting for dump to complete");
1614		qca_wait_for_dump_collection(hdev);
1615	}
1616
1617	mutex_lock(&qca->hci_memdump_lock);
1618	if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1619		bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
1620		hci_devcd_abort(hu->hdev);
1621		if (qca->qca_memdump) {
 
1622			kfree(qca->qca_memdump);
1623			qca->qca_memdump = NULL;
1624		}
1625		qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1626		cancel_delayed_work(&qca->ctrl_memdump_timeout);
1627	}
1628	mutex_unlock(&qca->hci_memdump_lock);
1629
1630	if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
1631	    qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
1632		cancel_work_sync(&qca->ctrl_memdump_evt);
1633		skb_queue_purge(&qca->rx_memdump_q);
1634	}
1635
1636	clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1637}
1638
1639static void qca_cmd_timeout(struct hci_dev *hdev)
1640{
1641	struct hci_uart *hu = hci_get_drvdata(hdev);
1642	struct qca_data *qca = hu->priv;
1643
1644	set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1645	if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1646		set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1647		qca_send_crashbuffer(hu);
1648		qca_wait_for_dump_collection(hdev);
1649	} else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1650		/* Let us wait here until memory dump collected or
1651		 * memory dump timer expired.
1652		 */
1653		bt_dev_info(hdev, "waiting for dump to complete");
1654		qca_wait_for_dump_collection(hdev);
1655	}
1656
1657	mutex_lock(&qca->hci_memdump_lock);
1658	if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1659		qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1660		if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
1661			/* Inject hw error event to reset the device
1662			 * and driver.
1663			 */
1664			hci_reset_dev(hu->hdev);
1665		}
1666	}
1667	mutex_unlock(&qca->hci_memdump_lock);
1668}
1669
1670static bool qca_wakeup(struct hci_dev *hdev)
1671{
1672	struct hci_uart *hu = hci_get_drvdata(hdev);
1673	bool wakeup;
1674
1675	/* BT SoC attached through the serial bus is handled by the serdev driver.
1676	 * So we need to use the device handle of the serdev driver to get the
1677	 * status of device may wakeup.
1678	 */
1679	wakeup = device_may_wakeup(&hu->serdev->ctrl->dev);
1680	bt_dev_dbg(hu->hdev, "wakeup status : %d", wakeup);
1681
1682	return wakeup;
1683}
1684
1685static int qca_regulator_init(struct hci_uart *hu)
1686{
1687	enum qca_btsoc_type soc_type = qca_soc_type(hu);
1688	struct qca_serdev *qcadev;
1689	int ret;
1690	bool sw_ctrl_state;
1691
1692	/* Check for vregs status, may be hci down has turned
1693	 * off the voltage regulator.
1694	 */
1695	qcadev = serdev_device_get_drvdata(hu->serdev);
1696	if (!qcadev->bt_power->vregs_on) {
1697		serdev_device_close(hu->serdev);
1698		ret = qca_regulator_enable(qcadev);
1699		if (ret)
1700			return ret;
1701
1702		ret = serdev_device_open(hu->serdev);
1703		if (ret) {
1704			bt_dev_err(hu->hdev, "failed to open port");
1705			return ret;
1706		}
1707	}
1708
1709	switch (soc_type) {
1710	case QCA_WCN3988:
1711	case QCA_WCN3990:
1712	case QCA_WCN3991:
1713	case QCA_WCN3998:
1714		/* Forcefully enable wcn399x to enter in to boot mode. */
1715		host_set_baudrate(hu, 2400);
1716		ret = qca_send_power_pulse(hu, false);
1717		if (ret)
1718			return ret;
1719		break;
1720
1721	default:
1722		break;
1723	}
1724
1725	/* For wcn6750 need to enable gpio bt_en */
1726	if (qcadev->bt_en) {
1727		gpiod_set_value_cansleep(qcadev->bt_en, 0);
1728		msleep(50);
1729		gpiod_set_value_cansleep(qcadev->bt_en, 1);
1730		msleep(50);
1731		if (qcadev->sw_ctrl) {
1732			sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
1733			bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
1734		}
1735	}
1736
1737	qca_set_speed(hu, QCA_INIT_SPEED);
1738
1739	switch (soc_type) {
1740	case QCA_WCN3988:
1741	case QCA_WCN3990:
1742	case QCA_WCN3991:
1743	case QCA_WCN3998:
1744		ret = qca_send_power_pulse(hu, true);
1745		if (ret)
1746			return ret;
1747		break;
1748
1749	default:
1750		break;
1751	}
1752
1753	/* Now the device is in ready state to communicate with host.
1754	 * To sync host with device we need to reopen port.
1755	 * Without this, we will have RTS and CTS synchronization
1756	 * issues.
1757	 */
1758	serdev_device_close(hu->serdev);
1759	ret = serdev_device_open(hu->serdev);
1760	if (ret) {
1761		bt_dev_err(hu->hdev, "failed to open port");
1762		return ret;
1763	}
1764
1765	hci_uart_set_flow_control(hu, false);
1766
1767	return 0;
1768}
1769
1770static int qca_power_on(struct hci_dev *hdev)
1771{
1772	struct hci_uart *hu = hci_get_drvdata(hdev);
1773	enum qca_btsoc_type soc_type = qca_soc_type(hu);
1774	struct qca_serdev *qcadev;
1775	struct qca_data *qca = hu->priv;
1776	int ret = 0;
1777
1778	/* Non-serdev device usually is powered by external power
1779	 * and don't need additional action in driver for power on
1780	 */
1781	if (!hu->serdev)
1782		return 0;
1783
1784	switch (soc_type) {
1785	case QCA_WCN3988:
1786	case QCA_WCN3990:
1787	case QCA_WCN3991:
1788	case QCA_WCN3998:
1789	case QCA_WCN6750:
1790	case QCA_WCN6855:
1791	case QCA_WCN7850:
1792		ret = qca_regulator_init(hu);
1793		break;
1794
1795	default:
1796		qcadev = serdev_device_get_drvdata(hu->serdev);
1797		if (qcadev->bt_en) {
1798			gpiod_set_value_cansleep(qcadev->bt_en, 1);
1799			/* Controller needs time to bootup. */
1800			msleep(150);
1801		}
1802	}
1803
1804	clear_bit(QCA_BT_OFF, &qca->flags);
1805	return ret;
1806}
1807
1808static void hci_coredump_qca(struct hci_dev *hdev)
1809{
1810	int err;
1811	static const u8 param[] = { 0x26 };
1812
1813	err = __hci_cmd_send(hdev, 0xfc0c, 1, param);
1814	if (err < 0)
1815		bt_dev_err(hdev, "%s: trigger crash failed (%d)", __func__, err);
1816}
1817
1818static int qca_get_data_path_id(struct hci_dev *hdev, __u8 *data_path_id)
1819{
1820	/* QCA uses 1 as non-HCI data path id for HFP */
1821	*data_path_id = 1;
1822	return 0;
1823}
1824
1825static int qca_configure_hfp_offload(struct hci_dev *hdev)
1826{
1827	bt_dev_info(hdev, "HFP non-HCI data transport is supported");
1828	hdev->get_data_path_id = qca_get_data_path_id;
1829	/* Do not need to send HCI_Configure_Data_Path to configure non-HCI
1830	 * data transport path for QCA controllers, so set below field as NULL.
1831	 */
1832	hdev->get_codec_config_data = NULL;
1833	return 0;
1834}
1835
1836static int qca_setup(struct hci_uart *hu)
1837{
1838	struct hci_dev *hdev = hu->hdev;
1839	struct qca_data *qca = hu->priv;
1840	unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1841	unsigned int retries = 0;
1842	enum qca_btsoc_type soc_type = qca_soc_type(hu);
1843	const char *firmware_name = qca_get_firmware_name(hu);
1844	int ret;
1845	struct qca_btsoc_version ver;
1846	const char *soc_name;
1847
1848	ret = qca_check_speeds(hu);
1849	if (ret)
1850		return ret;
1851
1852	clear_bit(QCA_ROM_FW, &qca->flags);
1853	/* Patch downloading has to be done without IBS mode */
1854	set_bit(QCA_IBS_DISABLED, &qca->flags);
1855
1856	/* Enable controller to do both LE scan and BR/EDR inquiry
1857	 * simultaneously.
1858	 */
1859	set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
1860
1861	switch (soc_type) {
1862	case QCA_QCA2066:
1863		soc_name = "qca2066";
1864		break;
1865
1866	case QCA_WCN3988:
1867	case QCA_WCN3990:
1868	case QCA_WCN3991:
1869	case QCA_WCN3998:
1870		soc_name = "wcn399x";
1871		break;
1872
1873	case QCA_WCN6750:
1874		soc_name = "wcn6750";
1875		break;
1876
1877	case QCA_WCN6855:
1878		soc_name = "wcn6855";
1879		break;
1880
1881	case QCA_WCN7850:
1882		soc_name = "wcn7850";
1883		break;
1884
1885	default:
1886		soc_name = "ROME/QCA6390";
1887	}
1888	bt_dev_info(hdev, "setting up %s", soc_name);
1889
1890	qca->memdump_state = QCA_MEMDUMP_IDLE;
1891
1892retry:
1893	ret = qca_power_on(hdev);
1894	if (ret)
1895		goto out;
1896
1897	clear_bit(QCA_SSR_TRIGGERED, &qca->flags);
1898
1899	switch (soc_type) {
1900	case QCA_WCN3988:
1901	case QCA_WCN3990:
1902	case QCA_WCN3991:
1903	case QCA_WCN3998:
1904	case QCA_WCN6750:
1905	case QCA_WCN6855:
1906	case QCA_WCN7850:
1907
1908		/* Set BDA quirk bit for reading BDA value from fwnode property
1909		 * only if that property exist in DT.
1910		 */
1911		if (fwnode_property_present(dev_fwnode(hdev->dev.parent), "local-bd-address")) {
1912			set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1913			bt_dev_info(hdev, "setting quirk bit to read BDA from fwnode later");
1914		} else {
1915			bt_dev_dbg(hdev, "local-bd-address` is not present in the devicetree so not setting quirk bit for BDA");
1916		}
1917
1918		hci_set_aosp_capable(hdev);
1919
1920		ret = qca_read_soc_version(hdev, &ver, soc_type);
1921		if (ret)
1922			goto out;
1923		break;
1924
1925	default:
1926		qca_set_speed(hu, QCA_INIT_SPEED);
1927	}
1928
1929	/* Setup user speed if needed */
1930	speed = qca_get_speed(hu, QCA_OPER_SPEED);
1931	if (speed) {
1932		ret = qca_set_speed(hu, QCA_OPER_SPEED);
1933		if (ret)
1934			goto out;
1935
1936		qca_baudrate = qca_get_baudrate_value(speed);
1937	}
1938
1939	switch (soc_type) {
1940	case QCA_WCN3988:
1941	case QCA_WCN3990:
1942	case QCA_WCN3991:
1943	case QCA_WCN3998:
1944	case QCA_WCN6750:
1945	case QCA_WCN6855:
1946	case QCA_WCN7850:
1947		break;
1948
1949	default:
1950		/* Get QCA version information */
1951		ret = qca_read_soc_version(hdev, &ver, soc_type);
1952		if (ret)
1953			goto out;
1954	}
1955
1956	/* Setup patch / NVM configurations */
1957	ret = qca_uart_setup(hdev, qca_baudrate, soc_type, ver,
1958			firmware_name);
1959	if (!ret) {
1960		clear_bit(QCA_IBS_DISABLED, &qca->flags);
1961		qca_debugfs_init(hdev);
1962		hu->hdev->hw_error = qca_hw_error;
1963		hu->hdev->cmd_timeout = qca_cmd_timeout;
1964		if (device_can_wakeup(hu->serdev->ctrl->dev.parent))
1965			hu->hdev->wakeup = qca_wakeup;
1966	} else if (ret == -ENOENT) {
1967		/* No patch/nvm-config found, run with original fw/config */
1968		set_bit(QCA_ROM_FW, &qca->flags);
1969		ret = 0;
1970	} else if (ret == -EAGAIN) {
1971		/*
1972		 * Userspace firmware loader will return -EAGAIN in case no
1973		 * patch/nvm-config is found, so run with original fw/config.
1974		 */
1975		set_bit(QCA_ROM_FW, &qca->flags);
1976		ret = 0;
1977	}
1978
1979out:
1980	if (ret && retries < MAX_INIT_RETRIES) {
1981		bt_dev_warn(hdev, "Retry BT power ON:%d", retries);
1982		qca_power_shutdown(hu);
1983		if (hu->serdev) {
1984			serdev_device_close(hu->serdev);
1985			ret = serdev_device_open(hu->serdev);
1986			if (ret) {
1987				bt_dev_err(hdev, "failed to open port");
1988				return ret;
1989			}
1990		}
1991		retries++;
1992		goto retry;
1993	}
1994
1995	/* Setup bdaddr */
1996	if (soc_type == QCA_ROME)
1997		hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1998	else
1999		hu->hdev->set_bdaddr = qca_set_bdaddr;
2000
2001	if (soc_type == QCA_QCA2066)
2002		qca_configure_hfp_offload(hdev);
2003
2004	qca->fw_version = le16_to_cpu(ver.patch_ver);
2005	qca->controller_id = le16_to_cpu(ver.rom_ver);
2006	hci_devcd_register(hdev, hci_coredump_qca, qca_dmp_hdr, NULL);
2007
2008	return ret;
2009}
2010
2011static const struct hci_uart_proto qca_proto = {
2012	.id		= HCI_UART_QCA,
2013	.name		= "QCA",
2014	.manufacturer	= 29,
2015	.init_speed	= 115200,
2016	.oper_speed	= 3000000,
2017	.open		= qca_open,
2018	.close		= qca_close,
2019	.flush		= qca_flush,
2020	.setup		= qca_setup,
2021	.recv		= qca_recv,
2022	.enqueue	= qca_enqueue,
2023	.dequeue	= qca_dequeue,
2024};
2025
2026static const struct qca_device_data qca_soc_data_wcn3988 __maybe_unused = {
2027	.soc_type = QCA_WCN3988,
2028	.vregs = (struct qca_vreg []) {
2029		{ "vddio", 15000  },
2030		{ "vddxo", 80000  },
2031		{ "vddrf", 300000 },
2032		{ "vddch0", 450000 },
2033	},
2034	.num_vregs = 4,
2035};
2036
2037static const struct qca_device_data qca_soc_data_wcn3990 __maybe_unused = {
2038	.soc_type = QCA_WCN3990,
2039	.vregs = (struct qca_vreg []) {
2040		{ "vddio", 15000  },
2041		{ "vddxo", 80000  },
2042		{ "vddrf", 300000 },
2043		{ "vddch0", 450000 },
2044	},
2045	.num_vregs = 4,
2046};
2047
2048static const struct qca_device_data qca_soc_data_wcn3991 __maybe_unused = {
2049	.soc_type = QCA_WCN3991,
2050	.vregs = (struct qca_vreg []) {
2051		{ "vddio", 15000  },
2052		{ "vddxo", 80000  },
2053		{ "vddrf", 300000 },
2054		{ "vddch0", 450000 },
2055	},
2056	.num_vregs = 4,
2057	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
2058};
2059
2060static const struct qca_device_data qca_soc_data_wcn3998 __maybe_unused = {
2061	.soc_type = QCA_WCN3998,
2062	.vregs = (struct qca_vreg []) {
2063		{ "vddio", 10000  },
2064		{ "vddxo", 80000  },
2065		{ "vddrf", 300000 },
2066		{ "vddch0", 450000 },
2067	},
2068	.num_vregs = 4,
2069};
2070
2071static const struct qca_device_data qca_soc_data_qca2066 __maybe_unused = {
2072	.soc_type = QCA_QCA2066,
2073	.num_vregs = 0,
2074	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
2075};
2076
2077static const struct qca_device_data qca_soc_data_qca6390 __maybe_unused = {
2078	.soc_type = QCA_QCA6390,
2079	.num_vregs = 0,
2080};
2081
2082static const struct qca_device_data qca_soc_data_wcn6750 __maybe_unused = {
2083	.soc_type = QCA_WCN6750,
2084	.vregs = (struct qca_vreg []) {
2085		{ "vddio", 5000 },
2086		{ "vddaon", 26000 },
2087		{ "vddbtcxmx", 126000 },
2088		{ "vddrfacmn", 12500 },
2089		{ "vddrfa0p8", 102000 },
2090		{ "vddrfa1p7", 302000 },
2091		{ "vddrfa1p2", 257000 },
2092		{ "vddrfa2p2", 1700000 },
2093		{ "vddasd", 200 },
2094	},
2095	.num_vregs = 9,
2096	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
2097};
2098
2099static const struct qca_device_data qca_soc_data_wcn6855 __maybe_unused = {
2100	.soc_type = QCA_WCN6855,
2101	.vregs = (struct qca_vreg []) {
2102		{ "vddio", 5000 },
2103		{ "vddbtcxmx", 126000 },
2104		{ "vddrfacmn", 12500 },
2105		{ "vddrfa0p8", 102000 },
2106		{ "vddrfa1p7", 302000 },
2107		{ "vddrfa1p2", 257000 },
2108	},
2109	.num_vregs = 6,
2110	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
2111};
2112
2113static const struct qca_device_data qca_soc_data_wcn7850 __maybe_unused = {
2114	.soc_type = QCA_WCN7850,
2115	.vregs = (struct qca_vreg []) {
2116		{ "vddio", 5000 },
2117		{ "vddaon", 26000 },
2118		{ "vdddig", 126000 },
2119		{ "vddrfa0p8", 102000 },
2120		{ "vddrfa1p2", 257000 },
2121		{ "vddrfa1p9", 302000 },
2122	},
2123	.num_vregs = 6,
2124	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
2125};
2126
2127static void qca_power_shutdown(struct hci_uart *hu)
2128{
2129	struct qca_serdev *qcadev;
2130	struct qca_data *qca = hu->priv;
2131	unsigned long flags;
2132	enum qca_btsoc_type soc_type = qca_soc_type(hu);
2133	bool sw_ctrl_state;
2134
2135	/* From this point we go into power off state. But serial port is
2136	 * still open, stop queueing the IBS data and flush all the buffered
2137	 * data in skb's.
2138	 */
2139	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
2140	set_bit(QCA_IBS_DISABLED, &qca->flags);
2141	qca_flush(hu);
2142	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
2143
2144	/* Non-serdev device usually is powered by external power
2145	 * and don't need additional action in driver for power down
2146	 */
2147	if (!hu->serdev)
2148		return;
2149
2150	qcadev = serdev_device_get_drvdata(hu->serdev);
2151
2152	switch (soc_type) {
2153	case QCA_WCN3988:
2154	case QCA_WCN3990:
2155	case QCA_WCN3991:
2156	case QCA_WCN3998:
2157		host_set_baudrate(hu, 2400);
2158		qca_send_power_pulse(hu, false);
2159		qca_regulator_disable(qcadev);
2160		break;
2161
2162	case QCA_WCN6750:
2163	case QCA_WCN6855:
2164		gpiod_set_value_cansleep(qcadev->bt_en, 0);
2165		msleep(100);
2166		qca_regulator_disable(qcadev);
2167		if (qcadev->sw_ctrl) {
2168			sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
2169			bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
2170		}
2171		break;
2172
2173	default:
2174		gpiod_set_value_cansleep(qcadev->bt_en, 0);
2175	}
2176
2177	set_bit(QCA_BT_OFF, &qca->flags);
2178}
2179
2180static int qca_power_off(struct hci_dev *hdev)
2181{
2182	struct hci_uart *hu = hci_get_drvdata(hdev);
2183	struct qca_data *qca = hu->priv;
2184	enum qca_btsoc_type soc_type = qca_soc_type(hu);
2185
2186	hu->hdev->hw_error = NULL;
2187	hu->hdev->cmd_timeout = NULL;
2188
2189	del_timer_sync(&qca->wake_retrans_timer);
2190	del_timer_sync(&qca->tx_idle_timer);
2191
2192	/* Stop sending shutdown command if soc crashes. */
2193	if (soc_type != QCA_ROME
2194		&& qca->memdump_state == QCA_MEMDUMP_IDLE) {
2195		qca_send_pre_shutdown_cmd(hdev);
2196		usleep_range(8000, 10000);
2197	}
2198
2199	qca_power_shutdown(hu);
2200	return 0;
2201}
2202
2203static int qca_regulator_enable(struct qca_serdev *qcadev)
2204{
2205	struct qca_power *power = qcadev->bt_power;
2206	int ret;
2207
2208	/* Already enabled */
2209	if (power->vregs_on)
2210		return 0;
2211
2212	BT_DBG("enabling %d regulators)", power->num_vregs);
2213
2214	ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
2215	if (ret)
2216		return ret;
2217
2218	power->vregs_on = true;
2219
2220	ret = clk_prepare_enable(qcadev->susclk);
2221	if (ret)
2222		qca_regulator_disable(qcadev);
2223
2224	return ret;
2225}
2226
2227static void qca_regulator_disable(struct qca_serdev *qcadev)
2228{
2229	struct qca_power *power;
2230
2231	if (!qcadev)
2232		return;
2233
2234	power = qcadev->bt_power;
2235
2236	/* Already disabled? */
2237	if (!power->vregs_on)
2238		return;
2239
2240	regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
2241	power->vregs_on = false;
2242
2243	clk_disable_unprepare(qcadev->susclk);
2244}
2245
2246static int qca_init_regulators(struct qca_power *qca,
2247				const struct qca_vreg *vregs, size_t num_vregs)
2248{
2249	struct regulator_bulk_data *bulk;
2250	int ret;
2251	int i;
2252
2253	bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
2254	if (!bulk)
2255		return -ENOMEM;
2256
2257	for (i = 0; i < num_vregs; i++)
2258		bulk[i].supply = vregs[i].name;
2259
2260	ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
2261	if (ret < 0)
2262		return ret;
2263
2264	for (i = 0; i < num_vregs; i++) {
2265		ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
2266		if (ret)
2267			return ret;
2268	}
2269
2270	qca->vreg_bulk = bulk;
2271	qca->num_vregs = num_vregs;
2272
2273	return 0;
2274}
2275
2276static int qca_serdev_probe(struct serdev_device *serdev)
2277{
2278	struct qca_serdev *qcadev;
2279	struct hci_dev *hdev;
2280	const struct qca_device_data *data;
2281	int err;
2282	bool power_ctrl_enabled = true;
2283
2284	qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
2285	if (!qcadev)
2286		return -ENOMEM;
2287
2288	qcadev->serdev_hu.serdev = serdev;
2289	data = device_get_match_data(&serdev->dev);
2290	serdev_device_set_drvdata(serdev, qcadev);
2291	device_property_read_string(&serdev->dev, "firmware-name",
2292					 &qcadev->firmware_name);
2293	device_property_read_u32(&serdev->dev, "max-speed",
2294				 &qcadev->oper_speed);
2295	if (!qcadev->oper_speed)
2296		BT_DBG("UART will pick default operating speed");
2297
2298	if (data)
 
 
2299		qcadev->btsoc_type = data->soc_type;
2300	else
2301		qcadev->btsoc_type = QCA_ROME;
2302
2303	switch (qcadev->btsoc_type) {
2304	case QCA_WCN3988:
2305	case QCA_WCN3990:
2306	case QCA_WCN3991:
2307	case QCA_WCN3998:
2308	case QCA_WCN6750:
2309	case QCA_WCN6855:
2310	case QCA_WCN7850:
2311		qcadev->bt_power = devm_kzalloc(&serdev->dev,
2312						sizeof(struct qca_power),
2313						GFP_KERNEL);
2314		if (!qcadev->bt_power)
2315			return -ENOMEM;
2316
2317		qcadev->bt_power->dev = &serdev->dev;
2318		err = qca_init_regulators(qcadev->bt_power, data->vregs,
2319					  data->num_vregs);
2320		if (err) {
2321			BT_ERR("Failed to init regulators:%d", err);
2322			return err;
2323		}
2324
2325		qcadev->bt_power->vregs_on = false;
2326
2327		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
2328					       GPIOD_OUT_LOW);
2329		if (IS_ERR_OR_NULL(qcadev->bt_en) &&
2330		    (data->soc_type == QCA_WCN6750 ||
2331		     data->soc_type == QCA_WCN6855)) {
2332			dev_err(&serdev->dev, "failed to acquire BT_EN gpio\n");
2333			power_ctrl_enabled = false;
2334		}
2335
2336		qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
2337					       GPIOD_IN);
2338		if (IS_ERR_OR_NULL(qcadev->sw_ctrl) &&
2339		    (data->soc_type == QCA_WCN6750 ||
2340		     data->soc_type == QCA_WCN6855 ||
2341		     data->soc_type == QCA_WCN7850))
2342			dev_warn(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
2343
2344		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
2345		if (IS_ERR(qcadev->susclk)) {
2346			dev_err(&serdev->dev, "failed to acquire clk\n");
2347			return PTR_ERR(qcadev->susclk);
2348		}
2349
2350		err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
2351		if (err) {
2352			BT_ERR("wcn3990 serdev registration failed");
2353			return err;
2354		}
2355		break;
 
 
 
 
2356
2357	default:
2358		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
2359					       GPIOD_OUT_LOW);
2360		if (IS_ERR_OR_NULL(qcadev->bt_en)) {
2361			dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
2362			power_ctrl_enabled = false;
2363		}
2364
2365		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
2366		if (IS_ERR(qcadev->susclk)) {
2367			dev_warn(&serdev->dev, "failed to acquire clk\n");
2368			return PTR_ERR(qcadev->susclk);
2369		}
2370		err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
2371		if (err)
2372			return err;
2373
2374		err = clk_prepare_enable(qcadev->susclk);
2375		if (err)
2376			return err;
2377
2378		err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
2379		if (err) {
2380			BT_ERR("Rome serdev registration failed");
2381			clk_disable_unprepare(qcadev->susclk);
2382			return err;
2383		}
2384	}
2385
2386	hdev = qcadev->serdev_hu.hdev;
2387
2388	if (power_ctrl_enabled) {
2389		set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
2390		hdev->shutdown = qca_power_off;
2391	}
2392
2393	if (data) {
2394		/* Wideband speech support must be set per driver since it can't
2395		 * be queried via hci. Same with the valid le states quirk.
2396		 */
2397		if (data->capabilities & QCA_CAP_WIDEBAND_SPEECH)
2398			set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED,
2399				&hdev->quirks);
2400
2401		if (data->capabilities & QCA_CAP_VALID_LE_STATES)
2402			set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
2403	}
2404
2405	return 0;
2406}
2407
2408static void qca_serdev_remove(struct serdev_device *serdev)
2409{
2410	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2411	struct qca_power *power = qcadev->bt_power;
2412
2413	switch (qcadev->btsoc_type) {
2414	case QCA_WCN3988:
2415	case QCA_WCN3990:
2416	case QCA_WCN3991:
2417	case QCA_WCN3998:
2418	case QCA_WCN6750:
2419	case QCA_WCN6855:
2420	case QCA_WCN7850:
2421		if (power->vregs_on) {
2422			qca_power_shutdown(&qcadev->serdev_hu);
2423			break;
2424		}
2425		fallthrough;
2426
2427	default:
2428		if (qcadev->susclk)
2429			clk_disable_unprepare(qcadev->susclk);
2430	}
2431
2432	hci_uart_unregister_device(&qcadev->serdev_hu);
2433}
2434
2435static void qca_serdev_shutdown(struct device *dev)
2436{
2437	int ret;
2438	int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
2439	struct serdev_device *serdev = to_serdev_device(dev);
2440	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2441	struct hci_uart *hu = &qcadev->serdev_hu;
2442	struct hci_dev *hdev = hu->hdev;
2443	struct qca_data *qca = hu->priv;
2444	const u8 ibs_wake_cmd[] = { 0xFD };
2445	const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 };
2446
2447	if (qcadev->btsoc_type == QCA_QCA6390) {
2448		if (test_bit(QCA_BT_OFF, &qca->flags) ||
2449		    !test_bit(HCI_RUNNING, &hdev->flags))
2450			return;
2451
2452		serdev_device_write_flush(serdev);
2453		ret = serdev_device_write_buf(serdev, ibs_wake_cmd,
2454					      sizeof(ibs_wake_cmd));
2455		if (ret < 0) {
2456			BT_ERR("QCA send IBS_WAKE_IND error: %d", ret);
2457			return;
2458		}
2459		serdev_device_wait_until_sent(serdev, timeout);
2460		usleep_range(8000, 10000);
2461
2462		serdev_device_write_flush(serdev);
2463		ret = serdev_device_write_buf(serdev, edl_reset_soc_cmd,
2464					      sizeof(edl_reset_soc_cmd));
2465		if (ret < 0) {
2466			BT_ERR("QCA send EDL_RESET_REQ error: %d", ret);
2467			return;
2468		}
2469		serdev_device_wait_until_sent(serdev, timeout);
2470		usleep_range(8000, 10000);
2471	}
2472}
2473
2474static int __maybe_unused qca_suspend(struct device *dev)
2475{
2476	struct serdev_device *serdev = to_serdev_device(dev);
2477	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2478	struct hci_uart *hu = &qcadev->serdev_hu;
2479	struct qca_data *qca = hu->priv;
2480	unsigned long flags;
2481	bool tx_pending = false;
2482	int ret = 0;
2483	u8 cmd;
2484	u32 wait_timeout = 0;
2485
2486	set_bit(QCA_SUSPENDING, &qca->flags);
2487
2488	/* if BT SoC is running with default firmware then it does not
2489	 * support in-band sleep
2490	 */
2491	if (test_bit(QCA_ROM_FW, &qca->flags))
2492		return 0;
2493
2494	/* During SSR after memory dump collection, controller will be
2495	 * powered off and then powered on.If controller is powered off
2496	 * during SSR then we should wait until SSR is completed.
2497	 */
2498	if (test_bit(QCA_BT_OFF, &qca->flags) &&
2499	    !test_bit(QCA_SSR_TRIGGERED, &qca->flags))
2500		return 0;
2501
2502	if (test_bit(QCA_IBS_DISABLED, &qca->flags) ||
2503	    test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
2504		wait_timeout = test_bit(QCA_SSR_TRIGGERED, &qca->flags) ?
2505					IBS_DISABLE_SSR_TIMEOUT_MS :
2506					FW_DOWNLOAD_TIMEOUT_MS;
2507
2508		/* QCA_IBS_DISABLED flag is set to true, During FW download
2509		 * and during memory dump collection. It is reset to false,
2510		 * After FW download complete.
2511		 */
2512		wait_on_bit_timeout(&qca->flags, QCA_IBS_DISABLED,
2513			    TASK_UNINTERRUPTIBLE, msecs_to_jiffies(wait_timeout));
2514
2515		if (test_bit(QCA_IBS_DISABLED, &qca->flags)) {
2516			bt_dev_err(hu->hdev, "SSR or FW download time out");
2517			ret = -ETIMEDOUT;
2518			goto error;
2519		}
2520	}
2521
2522	cancel_work_sync(&qca->ws_awake_device);
2523	cancel_work_sync(&qca->ws_awake_rx);
2524
2525	spin_lock_irqsave_nested(&qca->hci_ibs_lock,
2526				 flags, SINGLE_DEPTH_NESTING);
2527
2528	switch (qca->tx_ibs_state) {
2529	case HCI_IBS_TX_WAKING:
2530		del_timer(&qca->wake_retrans_timer);
2531		fallthrough;
2532	case HCI_IBS_TX_AWAKE:
2533		del_timer(&qca->tx_idle_timer);
2534
2535		serdev_device_write_flush(hu->serdev);
2536		cmd = HCI_IBS_SLEEP_IND;
2537		ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
2538
2539		if (ret < 0) {
2540			BT_ERR("Failed to send SLEEP to device");
2541			break;
2542		}
2543
2544		qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
2545		qca->ibs_sent_slps++;
2546		tx_pending = true;
2547		break;
2548
2549	case HCI_IBS_TX_ASLEEP:
2550		break;
2551
2552	default:
2553		BT_ERR("Spurious tx state %d", qca->tx_ibs_state);
2554		ret = -EINVAL;
2555		break;
2556	}
2557
2558	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
2559
2560	if (ret < 0)
2561		goto error;
2562
2563	if (tx_pending) {
2564		serdev_device_wait_until_sent(hu->serdev,
2565					      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
2566		serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
2567	}
2568
2569	/* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going
2570	 * to sleep, so that the packet does not wake the system later.
2571	 */
2572	ret = wait_event_interruptible_timeout(qca->suspend_wait_q,
2573			qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
2574			msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
2575	if (ret == 0) {
2576		ret = -ETIMEDOUT;
2577		goto error;
2578	}
2579
2580	return 0;
2581
2582error:
2583	clear_bit(QCA_SUSPENDING, &qca->flags);
2584
2585	return ret;
2586}
2587
2588static int __maybe_unused qca_resume(struct device *dev)
2589{
2590	struct serdev_device *serdev = to_serdev_device(dev);
2591	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2592	struct hci_uart *hu = &qcadev->serdev_hu;
2593	struct qca_data *qca = hu->priv;
2594
2595	clear_bit(QCA_SUSPENDING, &qca->flags);
2596
2597	return 0;
2598}
2599
2600static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume);
2601
2602#ifdef CONFIG_OF
2603static const struct of_device_id qca_bluetooth_of_match[] = {
2604	{ .compatible = "qcom,qca2066-bt", .data = &qca_soc_data_qca2066},
2605	{ .compatible = "qcom,qca6174-bt" },
2606	{ .compatible = "qcom,qca6390-bt", .data = &qca_soc_data_qca6390},
2607	{ .compatible = "qcom,qca9377-bt" },
2608	{ .compatible = "qcom,wcn3988-bt", .data = &qca_soc_data_wcn3988},
2609	{ .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
2610	{ .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
2611	{ .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
2612	{ .compatible = "qcom,wcn6750-bt", .data = &qca_soc_data_wcn6750},
2613	{ .compatible = "qcom,wcn6855-bt", .data = &qca_soc_data_wcn6855},
2614	{ .compatible = "qcom,wcn7850-bt", .data = &qca_soc_data_wcn7850},
2615	{ /* sentinel */ }
2616};
2617MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
2618#endif
2619
2620#ifdef CONFIG_ACPI
2621static const struct acpi_device_id qca_bluetooth_acpi_match[] = {
2622	{ "QCOM2066", (kernel_ulong_t)&qca_soc_data_qca2066 },
2623	{ "QCOM6390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2624	{ "DLA16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2625	{ "DLB16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2626	{ "DLB26390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2627	{ },
2628};
2629MODULE_DEVICE_TABLE(acpi, qca_bluetooth_acpi_match);
2630#endif
2631
2632#ifdef CONFIG_DEV_COREDUMP
2633static void hciqca_coredump(struct device *dev)
2634{
2635	struct serdev_device *serdev = to_serdev_device(dev);
2636	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2637	struct hci_uart *hu = &qcadev->serdev_hu;
2638	struct hci_dev  *hdev = hu->hdev;
2639
2640	if (hdev->dump.coredump)
2641		hdev->dump.coredump(hdev);
2642}
2643#endif
2644
2645static struct serdev_device_driver qca_serdev_driver = {
2646	.probe = qca_serdev_probe,
2647	.remove = qca_serdev_remove,
2648	.driver = {
2649		.name = "hci_uart_qca",
2650		.of_match_table = of_match_ptr(qca_bluetooth_of_match),
2651		.acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
2652		.shutdown = qca_serdev_shutdown,
2653		.pm = &qca_pm_ops,
2654#ifdef CONFIG_DEV_COREDUMP
2655		.coredump = hciqca_coredump,
2656#endif
2657	},
2658};
2659
2660int __init qca_init(void)
2661{
2662	serdev_device_driver_register(&qca_serdev_driver);
2663
2664	return hci_uart_register_proto(&qca_proto);
2665}
2666
2667int __exit qca_deinit(void)
2668{
2669	serdev_device_driver_unregister(&qca_serdev_driver);
2670
2671	return hci_uart_unregister_proto(&qca_proto);
2672}