drivers/bluetooth/hci_qca.c

   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/devcoredump.h>
  24 #include <linux/device.h>
  25 #include <linux/gpio/consumer.h>
  26 #include <linux/mod_devicetable.h>
  27 #include <linux/module.h>
  28 #include <linux/of_device.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/regulator/consumer.h>
  31 #include <linux/serdev.h>
  32 #include <asm/unaligned.h>
  33
  34 #include <net/bluetooth/bluetooth.h>
  35 #include <net/bluetooth/hci_core.h>
  36
  37 #include "hci_uart.h"
  38 #include "btqca.h"
  39
  40 /* HCI_IBS protocol messages */
  41 #define HCI_IBS_SLEEP_IND       0xFE
  42 #define HCI_IBS_WAKE_IND        0xFD
  43 #define HCI_IBS_WAKE_ACK        0xFC
  44 #define HCI_MAX_IBS_SIZE        10
  45
  46 #define IBS_WAKE_RETRANS_TIMEOUT_MS     100
  47 #define IBS_BTSOC_TX_IDLE_TIMEOUT_MS    40
  48 #define IBS_HOST_TX_IDLE_TIMEOUT_MS     2000
  49 #define CMD_TRANS_TIMEOUT_MS            100
  50 #define MEMDUMP_TIMEOUT_MS              8000
  51
  52 /* susclk rate */
  53 #define SUSCLK_RATE_32KHZ       32768
  54
  55 /* Controller debug log header */
  56 #define QCA_DEBUG_HANDLE        0x2EDC
  57
  58 /* Controller dump header */
  59 #define QCA_SSR_DUMP_HANDLE             0x0108
  60 #define QCA_DUMP_PACKET_SIZE            255
  61 #define QCA_LAST_SEQUENCE_NUM           0xFFFF
  62 #define QCA_CRASHBYTE_PACKET_LEN        1096
  63 #define QCA_MEMDUMP_BYTE                0xFB
  64
  65 enum qca_flags {
  66         QCA_IBS_ENABLED,
  67         QCA_DROP_VENDOR_EVENT,
  68         QCA_SUSPENDING,
  69         QCA_MEMDUMP_COLLECTION
  70 };
  71
  72
  73 /* HCI_IBS transmit side sleep protocol states */
  74 enum tx_ibs_states {
  75         HCI_IBS_TX_ASLEEP,
  76         HCI_IBS_TX_WAKING,
  77         HCI_IBS_TX_AWAKE,
  78 };
  79
  80 /* HCI_IBS receive side sleep protocol states */
  81 enum rx_states {
  82         HCI_IBS_RX_ASLEEP,
  83         HCI_IBS_RX_AWAKE,
  84 };
  85
  86 /* HCI_IBS transmit and receive side clock state vote */
  87 enum hci_ibs_clock_state_vote {
  88         HCI_IBS_VOTE_STATS_UPDATE,
  89         HCI_IBS_TX_VOTE_CLOCK_ON,
  90         HCI_IBS_TX_VOTE_CLOCK_OFF,
  91         HCI_IBS_RX_VOTE_CLOCK_ON,
  92         HCI_IBS_RX_VOTE_CLOCK_OFF,
  93 };
  94
  95 /* Controller memory dump states */
  96 enum qca_memdump_states {
  97         QCA_MEMDUMP_IDLE,
  98         QCA_MEMDUMP_COLLECTING,
  99         QCA_MEMDUMP_COLLECTED,
 100         QCA_MEMDUMP_TIMEOUT,
 101 };
 102
 103 struct qca_memdump_data {
 104         char *memdump_buf_head;
 105         char *memdump_buf_tail;
 106         u32 current_seq_no;
 107         u32 received_dump;
 108 };
 109
 110 struct qca_memdump_event_hdr {
 111         __u8    evt;
 112         __u8    plen;
 113         __u16   opcode;
 114         __u16   seq_no;
 115         __u8    reserved;
 116 } __packed;
 117
 118
 119 struct qca_dump_size {
 120         u32 dump_size;
 121 } __packed;
 122
 123 struct qca_data {
 124         struct hci_uart *hu;
 125         struct sk_buff *rx_skb;
 126         struct sk_buff_head txq;
 127         struct sk_buff_head tx_wait_q;  /* HCI_IBS wait queue   */
 128         struct sk_buff_head rx_memdump_q;       /* Memdump wait queue   */
 129         spinlock_t hci_ibs_lock;        /* HCI_IBS state lock   */
 130         u8 tx_ibs_state;        /* HCI_IBS transmit side power state*/
 131         u8 rx_ibs_state;        /* HCI_IBS receive side power state */
 132         bool tx_vote;           /* Clock must be on for TX */
 133         bool rx_vote;           /* Clock must be on for RX */
 134         struct timer_list tx_idle_timer;
 135         u32 tx_idle_delay;
 136         struct timer_list wake_retrans_timer;
 137         u32 wake_retrans;
 138         struct timer_list memdump_timer;
 139         struct workqueue_struct *workqueue;
 140         struct work_struct ws_awake_rx;
 141         struct work_struct ws_awake_device;
 142         struct work_struct ws_rx_vote_off;
 143         struct work_struct ws_tx_vote_off;
 144         struct work_struct ctrl_memdump_evt;
 145         struct qca_memdump_data *qca_memdump;
 146         unsigned long flags;
 147         struct completion drop_ev_comp;
 148         wait_queue_head_t suspend_wait_q;
 149         enum qca_memdump_states memdump_state;
 150
 151         /* For debugging purpose */
 152         u64 ibs_sent_wacks;
 153         u64 ibs_sent_slps;
 154         u64 ibs_sent_wakes;
 155         u64 ibs_recv_wacks;
 156         u64 ibs_recv_slps;
 157         u64 ibs_recv_wakes;
 158         u64 vote_last_jif;
 159         u32 vote_on_ms;
 160         u32 vote_off_ms;
 161         u64 tx_votes_on;
 162         u64 rx_votes_on;
 163         u64 tx_votes_off;
 164         u64 rx_votes_off;
 165         u64 votes_on;
 166         u64 votes_off;
 167 };
 168
 169 enum qca_speed_type {
 170         QCA_INIT_SPEED = 1,
 171         QCA_OPER_SPEED
 172 };
 173
 174 /*
 175  * Voltage regulator information required for configuring the
 176  * QCA Bluetooth chipset
 177  */
 178 struct qca_vreg {
 179         const char *name;
 180         unsigned int load_uA;
 181 };
 182
 183 struct qca_vreg_data {
 184         enum qca_btsoc_type soc_type;
 185         struct qca_vreg *vregs;
 186         size_t num_vregs;
 187 };
 188
 189 /*
 190  * Platform data for the QCA Bluetooth power driver.
 191  */
 192 struct qca_power {
 193         struct device *dev;
 194         struct regulator_bulk_data *vreg_bulk;
 195         int num_vregs;
 196         bool vregs_on;
 197 };
 198
 199 struct qca_serdev {
 200         struct hci_uart  serdev_hu;
 201         struct gpio_desc *bt_en;
 202         struct clk       *susclk;
 203         enum qca_btsoc_type btsoc_type;
 204         struct qca_power *bt_power;
 205         u32 init_speed;
 206         u32 oper_speed;
 207         const char *firmware_name;
 208 };
 209
 210 static int qca_regulator_enable(struct qca_serdev *qcadev);
 211 static void qca_regulator_disable(struct qca_serdev *qcadev);
 212 static void qca_power_shutdown(struct hci_uart *hu);
 213 static int qca_power_off(struct hci_dev *hdev);
 214 static void qca_controller_memdump(struct work_struct *work);
 215
 216 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
 217 {
 218         enum qca_btsoc_type soc_type;
 219
 220         if (hu->serdev) {
 221                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 222
 223                 soc_type = qsd->btsoc_type;
 224         } else {
 225                 soc_type = QCA_ROME;
 226         }
 227
 228         return soc_type;
 229 }
 230
 231 static const char *qca_get_firmware_name(struct hci_uart *hu)
 232 {
 233         if (hu->serdev) {
 234                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 235
 236                 return qsd->firmware_name;
 237         } else {
 238                 return NULL;
 239         }
 240 }
 241
 242 static void __serial_clock_on(struct tty_struct *tty)
 243 {
 244         /* TODO: Some chipset requires to enable UART clock on client
 245          * side to save power consumption or manual work is required.
 246          * Please put your code to control UART clock here if needed
 247          */
 248 }
 249
 250 static void __serial_clock_off(struct tty_struct *tty)
 251 {
 252         /* TODO: Some chipset requires to disable UART clock on client
 253          * side to save power consumption or manual work is required.
 254          * Please put your code to control UART clock off here if needed
 255          */
 256 }
 257
 258 /* serial_clock_vote needs to be called with the ibs lock held */
 259 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
 260 {
 261         struct qca_data *qca = hu->priv;
 262         unsigned int diff;
 263
 264         bool old_vote = (qca->tx_vote | qca->rx_vote);
 265         bool new_vote;
 266
 267         switch (vote) {
 268         case HCI_IBS_VOTE_STATS_UPDATE:
 269                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 270
 271                 if (old_vote)
 272                         qca->vote_off_ms += diff;
 273                 else
 274                         qca->vote_on_ms += diff;
 275                 return;
 276
 277         case HCI_IBS_TX_VOTE_CLOCK_ON:
 278                 qca->tx_vote = true;
 279                 qca->tx_votes_on++;
 280                 new_vote = true;
 281                 break;
 282
 283         case HCI_IBS_RX_VOTE_CLOCK_ON:
 284                 qca->rx_vote = true;
 285                 qca->rx_votes_on++;
 286                 new_vote = true;
 287                 break;
 288
 289         case HCI_IBS_TX_VOTE_CLOCK_OFF:
 290                 qca->tx_vote = false;
 291                 qca->tx_votes_off++;
 292                 new_vote = qca->rx_vote | qca->tx_vote;
 293                 break;
 294
 295         case HCI_IBS_RX_VOTE_CLOCK_OFF:
 296                 qca->rx_vote = false;
 297                 qca->rx_votes_off++;
 298                 new_vote = qca->rx_vote | qca->tx_vote;
 299                 break;
 300
 301         default:
 302                 BT_ERR("Voting irregularity");
 303                 return;
 304         }
 305
 306         if (new_vote != old_vote) {
 307                 if (new_vote)
 308                         __serial_clock_on(hu->tty);
 309                 else
 310                         __serial_clock_off(hu->tty);
 311
 312                 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
 313                        vote ? "true" : "false");
 314
 315                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 316
 317                 if (new_vote) {
 318                         qca->votes_on++;
 319                         qca->vote_off_ms += diff;
 320                 } else {
 321                         qca->votes_off++;
 322                         qca->vote_on_ms += diff;
 323                 }
 324                 qca->vote_last_jif = jiffies;
 325         }
 326 }
 327
 328 /* Builds and sends an HCI_IBS command packet.
 329  * These are very simple packets with only 1 cmd byte.
 330  */
 331 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
 332 {
 333         int err = 0;
 334         struct sk_buff *skb = NULL;
 335         struct qca_data *qca = hu->priv;
 336
 337         BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
 338
 339         skb = bt_skb_alloc(1, GFP_ATOMIC);
 340         if (!skb) {
 341                 BT_ERR("Failed to allocate memory for HCI_IBS packet");
 342                 return -ENOMEM;
 343         }
 344
 345         /* Assign HCI_IBS type */
 346         skb_put_u8(skb, cmd);
 347
 348         skb_queue_tail(&qca->txq, skb);
 349
 350         return err;
 351 }
 352
 353 static void qca_wq_awake_device(struct work_struct *work)
 354 {
 355         struct qca_data *qca = container_of(work, struct qca_data,
 356                                             ws_awake_device);
 357         struct hci_uart *hu = qca->hu;
 358         unsigned long retrans_delay;
 359         unsigned long flags;
 360
 361         BT_DBG("hu %p wq awake device", hu);
 362
 363         /* Vote for serial clock */
 364         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
 365
 366         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 367
 368         /* Send wake indication to device */
 369         if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
 370                 BT_ERR("Failed to send WAKE to device");
 371
 372         qca->ibs_sent_wakes++;
 373
 374         /* Start retransmit timer */
 375         retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 376         mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 377
 378         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 379
 380         /* Actually send the packets */
 381         hci_uart_tx_wakeup(hu);
 382 }
 383
 384 static void qca_wq_awake_rx(struct work_struct *work)
 385 {
 386         struct qca_data *qca = container_of(work, struct qca_data,
 387                                             ws_awake_rx);
 388         struct hci_uart *hu = qca->hu;
 389         unsigned long flags;
 390
 391         BT_DBG("hu %p wq awake rx", hu);
 392
 393         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
 394
 395         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 396         qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
 397
 398         /* Always acknowledge device wake up,
 399          * sending IBS message doesn't count as TX ON.
 400          */
 401         if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
 402                 BT_ERR("Failed to acknowledge device wake up");
 403
 404         qca->ibs_sent_wacks++;
 405
 406         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 407
 408         /* Actually send the packets */
 409         hci_uart_tx_wakeup(hu);
 410 }
 411
 412 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
 413 {
 414         struct qca_data *qca = container_of(work, struct qca_data,
 415                                             ws_rx_vote_off);
 416         struct hci_uart *hu = qca->hu;
 417
 418         BT_DBG("hu %p rx clock vote off", hu);
 419
 420         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
 421 }
 422
 423 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
 424 {
 425         struct qca_data *qca = container_of(work, struct qca_data,
 426                                             ws_tx_vote_off);
 427         struct hci_uart *hu = qca->hu;
 428
 429         BT_DBG("hu %p tx clock vote off", hu);
 430
 431         /* Run HCI tx handling unlocked */
 432         hci_uart_tx_wakeup(hu);
 433
 434         /* Now that message queued to tty driver, vote for tty clocks off.
 435          * It is up to the tty driver to pend the clocks off until tx done.
 436          */
 437         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
 438 }
 439
 440 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 441 {
 442         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 443         struct hci_uart *hu = qca->hu;
 444         unsigned long flags;
 445
 446         BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
 447
 448         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 449                                  flags, SINGLE_DEPTH_NESTING);
 450
 451         switch (qca->tx_ibs_state) {
 452         case HCI_IBS_TX_AWAKE:
 453                 /* TX_IDLE, go to SLEEP */
 454                 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
 455                         BT_ERR("Failed to send SLEEP to device");
 456                         break;
 457                 }
 458                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 459                 qca->ibs_sent_slps++;
 460                 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
 461                 break;
 462
 463         case HCI_IBS_TX_ASLEEP:
 464         case HCI_IBS_TX_WAKING:
 465                 /* Fall through */
 466
 467         default:
 468                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 469                 break;
 470         }
 471
 472         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 473 }
 474
 475 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 476 {
 477         struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
 478         struct hci_uart *hu = qca->hu;
 479         unsigned long flags, retrans_delay;
 480         bool retransmit = false;
 481
 482         BT_DBG("hu %p wake retransmit timeout in %d state",
 483                 hu, qca->tx_ibs_state);
 484
 485         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 486                                  flags, SINGLE_DEPTH_NESTING);
 487
 488         /* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */
 489         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 490                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 491                 return;
 492         }
 493
 494         switch (qca->tx_ibs_state) {
 495         case HCI_IBS_TX_WAKING:
 496                 /* No WAKE_ACK, retransmit WAKE */
 497                 retransmit = true;
 498                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
 499                         BT_ERR("Failed to acknowledge device wake up");
 500                         break;
 501                 }
 502                 qca->ibs_sent_wakes++;
 503                 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 504                 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 505                 break;
 506
 507         case HCI_IBS_TX_ASLEEP:
 508         case HCI_IBS_TX_AWAKE:
 509                 /* Fall through */
 510
 511         default:
 512                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 513                 break;
 514         }
 515
 516         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 517
 518         if (retransmit)
 519                 hci_uart_tx_wakeup(hu);
 520 }
 521
 522 static void hci_memdump_timeout(struct timer_list *t)
 523 {
 524         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 525         struct hci_uart *hu = qca->hu;
 526         struct qca_memdump_data *qca_memdump = qca->qca_memdump;
 527         char *memdump_buf = qca_memdump->memdump_buf_tail;
 528
 529         bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
 530         /* Inject hw error event to reset the device and driver. */
 531         hci_reset_dev(hu->hdev);
 532         vfree(memdump_buf);
 533         kfree(qca_memdump);
 534         qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
 535         del_timer(&qca->memdump_timer);
 536         cancel_work_sync(&qca->ctrl_memdump_evt);
 537 }
 538
 539 /* Initialize protocol */
 540 static int qca_open(struct hci_uart *hu)
 541 {
 542         struct qca_serdev *qcadev;
 543         struct qca_data *qca;
 544
 545         BT_DBG("hu %p qca_open", hu);
 546
 547         if (!hci_uart_has_flow_control(hu))
 548                 return -EOPNOTSUPP;
 549
 550         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 551         if (!qca)
 552                 return -ENOMEM;
 553
 554         skb_queue_head_init(&qca->txq);
 555         skb_queue_head_init(&qca->tx_wait_q);
 556         skb_queue_head_init(&qca->rx_memdump_q);
 557         spin_lock_init(&qca->hci_ibs_lock);
 558         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 559         if (!qca->workqueue) {
 560                 BT_ERR("QCA Workqueue not initialized properly");
 561                 kfree(qca);
 562                 return -ENOMEM;
 563         }
 564
 565         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 566         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 567         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 568         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 569         INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
 570         init_waitqueue_head(&qca->suspend_wait_q);
 571
 572         qca->hu = hu;
 573         init_completion(&qca->drop_ev_comp);
 574
 575         /* Assume we start with both sides asleep -- extra wakes OK */
 576         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 577         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 578
 579         qca->vote_last_jif = jiffies;
 580
 581         hu->priv = qca;
 582
 583         if (hu->serdev) {
 584                 qcadev = serdev_device_get_drvdata(hu->serdev);
 585                 if (qca_is_wcn399x(qcadev->btsoc_type)) {
 586                         hu->init_speed = qcadev->init_speed;
 587                         hu->oper_speed = qcadev->oper_speed;
 588                 }
 589         }
 590
 591         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 592         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 593
 594         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 595         qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS;
 596         timer_setup(&qca->memdump_timer, hci_memdump_timeout, 0);
 597
 598         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 599                qca->tx_idle_delay, qca->wake_retrans);
 600
 601         return 0;
 602 }
 603
 604 static void qca_debugfs_init(struct hci_dev *hdev)
 605 {
 606         struct hci_uart *hu = hci_get_drvdata(hdev);
 607         struct qca_data *qca = hu->priv;
 608         struct dentry *ibs_dir;
 609         umode_t mode;
 610
 611         if (!hdev->debugfs)
 612                 return;
 613
 614         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 615
 616         /* read only */
 617         mode = S_IRUGO;
 618         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 619         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 620         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 621                            &qca->ibs_sent_slps);
 622         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 623                            &qca->ibs_sent_wakes);
 624         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 625                            &qca->ibs_sent_wacks);
 626         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 627                            &qca->ibs_recv_slps);
 628         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 629                            &qca->ibs_recv_wakes);
 630         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 631                            &qca->ibs_recv_wacks);
 632         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 633         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 634         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 635         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 636         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 637         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 638         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 639         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 640         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 641         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 642
 643         /* read/write */
 644         mode = S_IRUGO | S_IWUSR;
 645         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 646         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 647                            &qca->tx_idle_delay);
 648 }
 649
 650 /* Flush protocol data */
 651 static int qca_flush(struct hci_uart *hu)
 652 {
 653         struct qca_data *qca = hu->priv;
 654
 655         BT_DBG("hu %p qca flush", hu);
 656
 657         skb_queue_purge(&qca->tx_wait_q);
 658         skb_queue_purge(&qca->txq);
 659
 660         return 0;
 661 }
 662
 663 /* Close protocol */
 664 static int qca_close(struct hci_uart *hu)
 665 {
 666         struct qca_data *qca = hu->priv;
 667
 668         BT_DBG("hu %p qca close", hu);
 669
 670         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 671
 672         skb_queue_purge(&qca->tx_wait_q);
 673         skb_queue_purge(&qca->txq);
 674         skb_queue_purge(&qca->rx_memdump_q);
 675         del_timer(&qca->tx_idle_timer);
 676         del_timer(&qca->wake_retrans_timer);
 677         del_timer(&qca->memdump_timer);
 678         destroy_workqueue(qca->workqueue);
 679         qca->hu = NULL;
 680
 681         qca_power_shutdown(hu);
 682
 683         kfree_skb(qca->rx_skb);
 684
 685         hu->priv = NULL;
 686
 687         kfree(qca);
 688
 689         return 0;
 690 }
 691
 692 /* Called upon a wake-up-indication from the device.
 693  */
 694 static void device_want_to_wakeup(struct hci_uart *hu)
 695 {
 696         unsigned long flags;
 697         struct qca_data *qca = hu->priv;
 698
 699         BT_DBG("hu %p want to wake up", hu);
 700
 701         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 702
 703         qca->ibs_recv_wakes++;
 704
 705         /* Don't wake the rx up when suspending. */
 706         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 707                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 708                 return;
 709         }
 710
 711         switch (qca->rx_ibs_state) {
 712         case HCI_IBS_RX_ASLEEP:
 713                 /* Make sure clock is on - we may have turned clock off since
 714                  * receiving the wake up indicator awake rx clock.
 715                  */
 716                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 717                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 718                 return;
 719
 720         case HCI_IBS_RX_AWAKE:
 721                 /* Always acknowledge device wake up,
 722                  * sending IBS message doesn't count as TX ON.
 723                  */
 724                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 725                         BT_ERR("Failed to acknowledge device wake up");
 726                         break;
 727                 }
 728                 qca->ibs_sent_wacks++;
 729                 break;
 730
 731         default:
 732                 /* Any other state is illegal */
 733                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 734                        qca->rx_ibs_state);
 735                 break;
 736         }
 737
 738         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 739
 740         /* Actually send the packets */
 741         hci_uart_tx_wakeup(hu);
 742 }
 743
 744 /* Called upon a sleep-indication from the device.
 745  */
 746 static void device_want_to_sleep(struct hci_uart *hu)
 747 {
 748         unsigned long flags;
 749         struct qca_data *qca = hu->priv;
 750
 751         BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);
 752
 753         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 754
 755         qca->ibs_recv_slps++;
 756
 757         switch (qca->rx_ibs_state) {
 758         case HCI_IBS_RX_AWAKE:
 759                 /* Update state */
 760                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 761                 /* Vote off rx clock under workqueue */
 762                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 763                 break;
 764
 765         case HCI_IBS_RX_ASLEEP:
 766                 break;
 767
 768         default:
 769                 /* Any other state is illegal */
 770                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 771                        qca->rx_ibs_state);
 772                 break;
 773         }
 774
 775         wake_up_interruptible(&qca->suspend_wait_q);
 776
 777         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 778 }
 779
 780 /* Called upon wake-up-acknowledgement from the device
 781  */
 782 static void device_woke_up(struct hci_uart *hu)
 783 {
 784         unsigned long flags, idle_delay;
 785         struct qca_data *qca = hu->priv;
 786         struct sk_buff *skb = NULL;
 787
 788         BT_DBG("hu %p woke up", hu);
 789
 790         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 791
 792         qca->ibs_recv_wacks++;
 793
 794         /* Don't react to the wake-up-acknowledgment when suspending. */
 795         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 796                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 797                 return;
 798         }
 799
 800         switch (qca->tx_ibs_state) {
 801         case HCI_IBS_TX_AWAKE:
 802                 /* Expect one if we send 2 WAKEs */
 803                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 804                        qca->tx_ibs_state);
 805                 break;
 806
 807         case HCI_IBS_TX_WAKING:
 808                 /* Send pending packets */
 809                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 810                         skb_queue_tail(&qca->txq, skb);
 811
 812                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 813                 del_timer(&qca->wake_retrans_timer);
 814                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 815                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 816                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 817                 break;
 818
 819         case HCI_IBS_TX_ASLEEP:
 820                 /* Fall through */
 821
 822         default:
 823                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 824                        qca->tx_ibs_state);
 825                 break;
 826         }
 827
 828         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 829
 830         /* Actually send the packets */
 831         hci_uart_tx_wakeup(hu);
 832 }
 833
 834 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 835  * two simultaneous tasklets.
 836  */
 837 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 838 {
 839         unsigned long flags = 0, idle_delay;
 840         struct qca_data *qca = hu->priv;
 841
 842         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 843                qca->tx_ibs_state);
 844
 845         /* Prepend skb with frame type */
 846         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 847
 848         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 849
 850         /* Don't go to sleep in middle of patch download or
 851          * Out-Of-Band(GPIOs control) sleep is selected.
 852          * Don't wake the device up when suspending.
 853          */
 854         if (!test_bit(QCA_IBS_ENABLED, &qca->flags) ||
 855             test_bit(QCA_SUSPENDING, &qca->flags)) {
 856                 skb_queue_tail(&qca->txq, skb);
 857                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 858                 return 0;
 859         }
 860
 861         /* Act according to current state */
 862         switch (qca->tx_ibs_state) {
 863         case HCI_IBS_TX_AWAKE:
 864                 BT_DBG("Device awake, sending normally");
 865                 skb_queue_tail(&qca->txq, skb);
 866                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 867                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 868                 break;
 869
 870         case HCI_IBS_TX_ASLEEP:
 871                 BT_DBG("Device asleep, waking up and queueing packet");
 872                 /* Save packet for later */
 873                 skb_queue_tail(&qca->tx_wait_q, skb);
 874
 875                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 876                 /* Schedule a work queue to wake up device */
 877                 queue_work(qca->workqueue, &qca->ws_awake_device);
 878                 break;
 879
 880         case HCI_IBS_TX_WAKING:
 881                 BT_DBG("Device waking up, queueing packet");
 882                 /* Transient state; just keep packet for later */
 883                 skb_queue_tail(&qca->tx_wait_q, skb);
 884                 break;
 885
 886         default:
 887                 BT_ERR("Illegal tx state: %d (losing packet)",
 888                        qca->tx_ibs_state);
 889                 kfree_skb(skb);
 890                 break;
 891         }
 892
 893         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 894
 895         return 0;
 896 }
 897
 898 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 899 {
 900         struct hci_uart *hu = hci_get_drvdata(hdev);
 901
 902         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 903
 904         device_want_to_sleep(hu);
 905
 906         kfree_skb(skb);
 907         return 0;
 908 }
 909
 910 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 911 {
 912         struct hci_uart *hu = hci_get_drvdata(hdev);
 913
 914         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 915
 916         device_want_to_wakeup(hu);
 917
 918         kfree_skb(skb);
 919         return 0;
 920 }
 921
 922 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 923 {
 924         struct hci_uart *hu = hci_get_drvdata(hdev);
 925
 926         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 927
 928         device_woke_up(hu);
 929
 930         kfree_skb(skb);
 931         return 0;
 932 }
 933
 934 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 935 {
 936         /* We receive debug logs from chip as an ACL packets.
 937          * Instead of sending the data to ACL to decode the
 938          * received data, we are pushing them to the above layers
 939          * as a diagnostic packet.
 940          */
 941         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 942                 return hci_recv_diag(hdev, skb);
 943
 944         return hci_recv_frame(hdev, skb);
 945 }
 946
 947 static void qca_controller_memdump(struct work_struct *work)
 948 {
 949         struct qca_data *qca = container_of(work, struct qca_data,
 950                                             ctrl_memdump_evt);
 951         struct hci_uart *hu = qca->hu;
 952         struct sk_buff *skb;
 953         struct qca_memdump_event_hdr *cmd_hdr;
 954         struct qca_memdump_data *qca_memdump = qca->qca_memdump;
 955         struct qca_dump_size *dump;
 956         char *memdump_buf;
 957         char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
 958         u16 seq_no;
 959         u32 dump_size;
 960
 961         while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
 962
 963                 if (!qca_memdump) {
 964                         qca_memdump = kzalloc(sizeof(struct qca_memdump_data),
 965                                               GFP_ATOMIC);
 966                         if (!qca_memdump)
 967                                 return;
 968
 969                         qca->qca_memdump = qca_memdump;
 970                 }
 971
 972                 qca->memdump_state = QCA_MEMDUMP_COLLECTING;
 973                 cmd_hdr = (void *) skb->data;
 974                 seq_no = __le16_to_cpu(cmd_hdr->seq_no);
 975                 skb_pull(skb, sizeof(struct qca_memdump_event_hdr));
 976
 977                 if (!seq_no) {
 978
 979                         /* This is the first frame of memdump packet from
 980                          * the controller, Disable IBS to recevie dump
 981                          * with out any interruption, ideally time required for
 982                          * the controller to send the dump is 8 seconds. let us
 983                          * start timer to handle this asynchronous activity.
 984                          */
 985                         clear_bit(QCA_IBS_ENABLED, &qca->flags);
 986                         set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
 987                         dump = (void *) skb->data;
 988                         dump_size = __le32_to_cpu(dump->dump_size);
 989                         if (!(dump_size)) {
 990                                 bt_dev_err(hu->hdev, "Rx invalid memdump size");
 991                                 kfree_skb(skb);
 992                                 return;
 993                         }
 994
 995                         bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
 996                                     dump_size);
 997                         mod_timer(&qca->memdump_timer, (jiffies +
 998                                   msecs_to_jiffies(MEMDUMP_TIMEOUT_MS)));
 999
1000                         skb_pull(skb, sizeof(dump_size));
1001                         memdump_buf = vmalloc(dump_size);
1002                         qca_memdump->memdump_buf_head = memdump_buf;
1003                         qca_memdump->memdump_buf_tail = memdump_buf;
1004                 }
1005
1006                 memdump_buf = qca_memdump->memdump_buf_tail;
1007
1008                 /* If sequence no 0 is missed then there is no point in
1009                  * accepting the other sequences.
1010                  */
1011                 if (!memdump_buf) {
1012                         bt_dev_err(hu->hdev, "QCA: Discarding other packets");
1013                         kfree(qca_memdump);
1014                         kfree_skb(skb);
1015                         qca->qca_memdump = NULL;
1016                         return;
1017                 }
1018
1019                 /* There could be chance of missing some packets from
1020                  * the controller. In such cases let us store the dummy
1021                  * packets in the buffer.
1022                  */
1023                 while ((seq_no > qca_memdump->current_seq_no + 1) &&
1024                         seq_no != QCA_LAST_SEQUENCE_NUM) {
1025                         bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
1026                                    qca_memdump->current_seq_no);
1027                         memcpy(memdump_buf, nullBuff, QCA_DUMP_PACKET_SIZE);
1028                         memdump_buf = memdump_buf + QCA_DUMP_PACKET_SIZE;
1029                         qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
1030                         qca_memdump->current_seq_no++;
1031                 }
1032
1033                 memcpy(memdump_buf, (unsigned char *) skb->data, skb->len);
1034                 memdump_buf = memdump_buf + skb->len;
1035                 qca_memdump->memdump_buf_tail = memdump_buf;
1036                 qca_memdump->current_seq_no = seq_no + 1;
1037                 qca_memdump->received_dump += skb->len;
1038                 qca->qca_memdump = qca_memdump;
1039                 kfree_skb(skb);
1040                 if (seq_no == QCA_LAST_SEQUENCE_NUM) {
1041                         bt_dev_info(hu->hdev, "QCA writing crash dump of size %d bytes",
1042                                    qca_memdump->received_dump);
1043                         memdump_buf = qca_memdump->memdump_buf_head;
1044                         dev_coredumpv(&hu->serdev->dev, memdump_buf,
1045                                       qca_memdump->received_dump, GFP_KERNEL);
1046                         del_timer(&qca->memdump_timer);
1047                         kfree(qca->qca_memdump);
1048                         qca->qca_memdump = NULL;
1049                         qca->memdump_state = QCA_MEMDUMP_COLLECTED;
1050                 }
1051         }
1052
1053 }
1054
1055 int qca_controller_memdump_event(struct hci_dev *hdev, struct sk_buff *skb)
1056 {
1057         struct hci_uart *hu = hci_get_drvdata(hdev);
1058         struct qca_data *qca = hu->priv;
1059
1060         skb_queue_tail(&qca->rx_memdump_q, skb);
1061         queue_work(qca->workqueue, &qca->ctrl_memdump_evt);
1062
1063         return 0;
1064 }
1065
1066 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
1067 {
1068         struct hci_uart *hu = hci_get_drvdata(hdev);
1069         struct qca_data *qca = hu->priv;
1070
1071         if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
1072                 struct hci_event_hdr *hdr = (void *)skb->data;
1073
1074                 /* For the WCN3990 the vendor command for a baudrate change
1075                  * isn't sent as synchronous HCI command, because the
1076                  * controller sends the corresponding vendor event with the
1077                  * new baudrate. The event is received and properly decoded
1078                  * after changing the baudrate of the host port. It needs to
1079                  * be dropped, otherwise it can be misinterpreted as
1080                  * response to a later firmware download command (also a
1081                  * vendor command).
1082                  */
1083
1084                 if (hdr->evt == HCI_EV_VENDOR)
1085                         complete(&qca->drop_ev_comp);
1086
1087                 kfree_skb(skb);
1088
1089                 return 0;
1090         }
1091         /* We receive chip memory dump as an event packet, With a dedicated
1092          * handler followed by a hardware error event. When this event is
1093          * received we store dump into a file before closing hci. This
1094          * dump will help in triaging the issues.
1095          */
1096         if ((skb->data[0] == HCI_VENDOR_PKT) &&
1097             (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
1098                 return qca_controller_memdump_event(hdev, skb);
1099
1100         return hci_recv_frame(hdev, skb);
1101 }
1102
1103 #define QCA_IBS_SLEEP_IND_EVENT \
1104         .type = HCI_IBS_SLEEP_IND, \
1105         .hlen = 0, \
1106         .loff = 0, \
1107         .lsize = 0, \
1108         .maxlen = HCI_MAX_IBS_SIZE
1109
1110 #define QCA_IBS_WAKE_IND_EVENT \
1111         .type = HCI_IBS_WAKE_IND, \
1112         .hlen = 0, \
1113         .loff = 0, \
1114         .lsize = 0, \
1115         .maxlen = HCI_MAX_IBS_SIZE
1116
1117 #define QCA_IBS_WAKE_ACK_EVENT \
1118         .type = HCI_IBS_WAKE_ACK, \
1119         .hlen = 0, \
1120         .loff = 0, \
1121         .lsize = 0, \
1122         .maxlen = HCI_MAX_IBS_SIZE
1123
1124 static const struct h4_recv_pkt qca_recv_pkts[] = {
1125         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
1126         { H4_RECV_SCO,             .recv = hci_recv_frame    },
1127         { H4_RECV_EVENT,           .recv = qca_recv_event    },
1128         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
1129         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
1130         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
1131 };
1132
1133 static int qca_recv(struct hci_uart *hu, const void *data, int count)
1134 {
1135         struct qca_data *qca = hu->priv;
1136
1137         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
1138                 return -EUNATCH;
1139
1140         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
1141                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
1142         if (IS_ERR(qca->rx_skb)) {
1143                 int err = PTR_ERR(qca->rx_skb);
1144                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
1145                 qca->rx_skb = NULL;
1146                 return err;
1147         }
1148
1149         return count;
1150 }
1151
1152 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
1153 {
1154         struct qca_data *qca = hu->priv;
1155
1156         return skb_dequeue(&qca->txq);
1157 }
1158
1159 static uint8_t qca_get_baudrate_value(int speed)
1160 {
1161         switch (speed) {
1162         case 9600:
1163                 return QCA_BAUDRATE_9600;
1164         case 19200:
1165                 return QCA_BAUDRATE_19200;
1166         case 38400:
1167                 return QCA_BAUDRATE_38400;
1168         case 57600:
1169                 return QCA_BAUDRATE_57600;
1170         case 115200:
1171                 return QCA_BAUDRATE_115200;
1172         case 230400:
1173                 return QCA_BAUDRATE_230400;
1174         case 460800:
1175                 return QCA_BAUDRATE_460800;
1176         case 500000:
1177                 return QCA_BAUDRATE_500000;
1178         case 921600:
1179                 return QCA_BAUDRATE_921600;
1180         case 1000000:
1181                 return QCA_BAUDRATE_1000000;
1182         case 2000000:
1183                 return QCA_BAUDRATE_2000000;
1184         case 3000000:
1185                 return QCA_BAUDRATE_3000000;
1186         case 3200000:
1187                 return QCA_BAUDRATE_3200000;
1188         case 3500000:
1189                 return QCA_BAUDRATE_3500000;
1190         default:
1191                 return QCA_BAUDRATE_115200;
1192         }
1193 }
1194
1195 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
1196 {
1197         struct hci_uart *hu = hci_get_drvdata(hdev);
1198         struct qca_data *qca = hu->priv;
1199         struct sk_buff *skb;
1200         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
1201
1202         if (baudrate > QCA_BAUDRATE_3200000)
1203                 return -EINVAL;
1204
1205         cmd[4] = baudrate;
1206
1207         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1208         if (!skb) {
1209                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
1210                 return -ENOMEM;
1211         }
1212
1213         /* Assign commands to change baudrate and packet type. */
1214         skb_put_data(skb, cmd, sizeof(cmd));
1215         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1216
1217         skb_queue_tail(&qca->txq, skb);
1218         hci_uart_tx_wakeup(hu);
1219
1220         /* Wait for the baudrate change request to be sent */
1221
1222         while (!skb_queue_empty(&qca->txq))
1223                 usleep_range(100, 200);
1224
1225         if (hu->serdev)
1226                 serdev_device_wait_until_sent(hu->serdev,
1227                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1228
1229         /* Give the controller time to process the request */
1230         if (qca_is_wcn399x(qca_soc_type(hu)))
1231                 msleep(10);
1232         else
1233                 msleep(300);
1234
1235         return 0;
1236 }
1237
1238 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1239 {
1240         if (hu->serdev)
1241                 serdev_device_set_baudrate(hu->serdev, speed);
1242         else
1243                 hci_uart_set_baudrate(hu, speed);
1244 }
1245
1246 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1247 {
1248         int ret;
1249         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1250         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1251
1252         /* These power pulses are single byte command which are sent
1253          * at required baudrate to wcn3990. On wcn3990, we have an external
1254          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1255          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1256          * and also we use the same power inputs to turn on and off for
1257          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1258          * we send a power on pulse at 115200 bps. This algorithm will help to
1259          * save power. Disabling hardware flow control is mandatory while
1260          * sending power pulses to SoC.
1261          */
1262         bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1263
1264         serdev_device_write_flush(hu->serdev);
1265         hci_uart_set_flow_control(hu, true);
1266         ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1267         if (ret < 0) {
1268                 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1269                 return ret;
1270         }
1271
1272         serdev_device_wait_until_sent(hu->serdev, timeout);
1273         hci_uart_set_flow_control(hu, false);
1274
1275         /* Give to controller time to boot/shutdown */
1276         if (on)
1277                 msleep(100);
1278         else
1279                 msleep(10);
1280
1281         return 0;
1282 }
1283
1284 static unsigned int qca_get_speed(struct hci_uart *hu,
1285                                   enum qca_speed_type speed_type)
1286 {
1287         unsigned int speed = 0;
1288
1289         if (speed_type == QCA_INIT_SPEED) {
1290                 if (hu->init_speed)
1291                         speed = hu->init_speed;
1292                 else if (hu->proto->init_speed)
1293                         speed = hu->proto->init_speed;
1294         } else {
1295                 if (hu->oper_speed)
1296                         speed = hu->oper_speed;
1297                 else if (hu->proto->oper_speed)
1298                         speed = hu->proto->oper_speed;
1299         }
1300
1301         return speed;
1302 }
1303
1304 static int qca_check_speeds(struct hci_uart *hu)
1305 {
1306         if (qca_is_wcn399x(qca_soc_type(hu))) {
1307                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1308                     !qca_get_speed(hu, QCA_OPER_SPEED))
1309                         return -EINVAL;
1310         } else {
1311                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1312                     !qca_get_speed(hu, QCA_OPER_SPEED))
1313                         return -EINVAL;
1314         }
1315
1316         return 0;
1317 }
1318
1319 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1320 {
1321         unsigned int speed, qca_baudrate;
1322         struct qca_data *qca = hu->priv;
1323         int ret = 0;
1324
1325         if (speed_type == QCA_INIT_SPEED) {
1326                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1327                 if (speed)
1328                         host_set_baudrate(hu, speed);
1329         } else {
1330                 enum qca_btsoc_type soc_type = qca_soc_type(hu);
1331
1332                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1333                 if (!speed)
1334                         return 0;
1335
1336                 /* Disable flow control for wcn3990 to deassert RTS while
1337                  * changing the baudrate of chip and host.
1338                  */
1339                 if (qca_is_wcn399x(soc_type))
1340                         hci_uart_set_flow_control(hu, true);
1341
1342                 if (soc_type == QCA_WCN3990) {
1343                         reinit_completion(&qca->drop_ev_comp);
1344                         set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1345                 }
1346
1347                 qca_baudrate = qca_get_baudrate_value(speed);
1348                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1349                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1350                 if (ret)
1351                         goto error;
1352
1353                 host_set_baudrate(hu, speed);
1354
1355 error:
1356                 if (qca_is_wcn399x(soc_type))
1357                         hci_uart_set_flow_control(hu, false);
1358
1359                 if (soc_type == QCA_WCN3990) {
1360                         /* Wait for the controller to send the vendor event
1361                          * for the baudrate change command.
1362                          */
1363                         if (!wait_for_completion_timeout(&qca->drop_ev_comp,
1364                                                  msecs_to_jiffies(100))) {
1365                                 bt_dev_err(hu->hdev,
1366                                            "Failed to change controller baudrate\n");
1367                                 ret = -ETIMEDOUT;
1368                         }
1369
1370                         clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1371                 }
1372         }
1373
1374         return ret;
1375 }
1376
1377 static int qca_send_crashbuffer(struct hci_uart *hu)
1378 {
1379         struct qca_data *qca = hu->priv;
1380         struct sk_buff *skb;
1381
1382         skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
1383         if (!skb) {
1384                 bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
1385                 return -ENOMEM;
1386         }
1387
1388         /* We forcefully crash the controller, by sending 0xfb byte for
1389          * 1024 times. We also might have chance of losing data, To be
1390          * on safer side we send 1096 bytes to the SoC.
1391          */
1392         memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
1393                QCA_CRASHBYTE_PACKET_LEN);
1394         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1395         bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
1396         skb_queue_tail(&qca->txq, skb);
1397         hci_uart_tx_wakeup(hu);
1398
1399         return 0;
1400 }
1401
1402 static void qca_wait_for_dump_collection(struct hci_dev *hdev)
1403 {
1404         struct hci_uart *hu = hci_get_drvdata(hdev);
1405         struct qca_data *qca = hu->priv;
1406         struct qca_memdump_data *qca_memdump = qca->qca_memdump;
1407         char *memdump_buf = NULL;
1408
1409         wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
1410                             TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);
1411
1412         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1413         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1414                 bt_dev_err(hu->hdev, "Clearing the buffers due to timeout");
1415                 if (qca_memdump)
1416                         memdump_buf = qca_memdump->memdump_buf_tail;
1417                 vfree(memdump_buf);
1418                 kfree(qca_memdump);
1419                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1420                 del_timer(&qca->memdump_timer);
1421                 cancel_work_sync(&qca->ctrl_memdump_evt);
1422         }
1423 }
1424
1425 static void qca_hw_error(struct hci_dev *hdev, u8 code)
1426 {
1427         struct hci_uart *hu = hci_get_drvdata(hdev);
1428         struct qca_data *qca = hu->priv;
1429
1430         bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);
1431
1432         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1433                 /* If hardware error event received for other than QCA
1434                  * soc memory dump event, then we need to crash the SOC
1435                  * and wait here for 8 seconds to get the dump packets.
1436                  * This will block main thread to be on hold until we
1437                  * collect dump.
1438                  */
1439                 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1440                 qca_send_crashbuffer(hu);
1441                 qca_wait_for_dump_collection(hdev);
1442         } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1443                 /* Let us wait here until memory dump collected or
1444                  * memory dump timer expired.
1445                  */
1446                 bt_dev_info(hdev, "waiting for dump to complete");
1447                 qca_wait_for_dump_collection(hdev);
1448         }
1449 }
1450
1451 static void qca_cmd_timeout(struct hci_dev *hdev)
1452 {
1453         struct hci_uart *hu = hci_get_drvdata(hdev);
1454         struct qca_data *qca = hu->priv;
1455
1456         if (qca->memdump_state == QCA_MEMDUMP_IDLE)
1457                 qca_send_crashbuffer(hu);
1458         else
1459                 bt_dev_info(hdev, "Dump collection is in process");
1460 }
1461
1462 static int qca_wcn3990_init(struct hci_uart *hu)
1463 {
1464         struct qca_serdev *qcadev;
1465         int ret;
1466
1467         /* Check for vregs status, may be hci down has turned
1468          * off the voltage regulator.
1469          */
1470         qcadev = serdev_device_get_drvdata(hu->serdev);
1471         if (!qcadev->bt_power->vregs_on) {
1472                 serdev_device_close(hu->serdev);
1473                 ret = qca_regulator_enable(qcadev);
1474                 if (ret)
1475                         return ret;
1476
1477                 ret = serdev_device_open(hu->serdev);
1478                 if (ret) {
1479                         bt_dev_err(hu->hdev, "failed to open port");
1480                         return ret;
1481                 }
1482         }
1483
1484         /* Forcefully enable wcn3990 to enter in to boot mode. */
1485         host_set_baudrate(hu, 2400);
1486         ret = qca_send_power_pulse(hu, false);
1487         if (ret)
1488                 return ret;
1489
1490         qca_set_speed(hu, QCA_INIT_SPEED);
1491         ret = qca_send_power_pulse(hu, true);
1492         if (ret)
1493                 return ret;
1494
1495         /* Now the device is in ready state to communicate with host.
1496          * To sync host with device we need to reopen port.
1497          * Without this, we will have RTS and CTS synchronization
1498          * issues.
1499          */
1500         serdev_device_close(hu->serdev);
1501         ret = serdev_device_open(hu->serdev);
1502         if (ret) {
1503                 bt_dev_err(hu->hdev, "failed to open port");
1504                 return ret;
1505         }
1506
1507         hci_uart_set_flow_control(hu, false);
1508
1509         return 0;
1510 }
1511
1512 static int qca_power_on(struct hci_dev *hdev)
1513 {
1514         struct hci_uart *hu = hci_get_drvdata(hdev);
1515         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1516         struct qca_serdev *qcadev;
1517         int ret = 0;
1518
1519         /* Non-serdev device usually is powered by external power
1520          * and don't need additional action in driver for power on
1521          */
1522         if (!hu->serdev)
1523                 return 0;
1524
1525         if (qca_is_wcn399x(soc_type)) {
1526                 ret = qca_wcn3990_init(hu);
1527         } else {
1528                 qcadev = serdev_device_get_drvdata(hu->serdev);
1529                 gpiod_set_value_cansleep(qcadev->bt_en, 1);
1530                 /* Controller needs time to bootup. */
1531                 msleep(150);
1532         }
1533
1534         return ret;
1535 }
1536
1537 static int qca_setup(struct hci_uart *hu)
1538 {
1539         struct hci_dev *hdev = hu->hdev;
1540         struct qca_data *qca = hu->priv;
1541         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1542         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1543         const char *firmware_name = qca_get_firmware_name(hu);
1544         int ret;
1545         int soc_ver = 0;
1546
1547         ret = qca_check_speeds(hu);
1548         if (ret)
1549                 return ret;
1550
1551         /* Patch downloading has to be done without IBS mode */
1552         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1553
1554         /* Enable controller to do both LE scan and BR/EDR inquiry
1555          * simultaneously.
1556          */
1557         set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
1558
1559         bt_dev_info(hdev, "setting up %s",
1560                 qca_is_wcn399x(soc_type) ? "wcn399x" : "ROME");
1561
1562         ret = qca_power_on(hdev);
1563         if (ret)
1564                 return ret;
1565
1566         if (qca_is_wcn399x(soc_type)) {
1567                 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute
1568                  * setup for every hci up.
1569                  */
1570                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1571                 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1572                 hu->hdev->shutdown = qca_power_off;
1573
1574                 ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
1575                 if (ret)
1576                         return ret;
1577         } else {
1578                 qca_set_speed(hu, QCA_INIT_SPEED);
1579         }
1580
1581         /* Setup user speed if needed */
1582         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1583         if (speed) {
1584                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1585                 if (ret)
1586                         return ret;
1587
1588                 qca_baudrate = qca_get_baudrate_value(speed);
1589         }
1590
1591         if (!qca_is_wcn399x(soc_type)) {
1592                 /* Get QCA version information */
1593                 ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
1594                 if (ret)
1595                         return ret;
1596         }
1597
1598         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1599         /* Setup patch / NVM configurations */
1600         ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver,
1601                         firmware_name);
1602         if (!ret) {
1603                 set_bit(QCA_IBS_ENABLED, &qca->flags);
1604                 qca_debugfs_init(hdev);
1605                 hu->hdev->hw_error = qca_hw_error;
1606                 hu->hdev->cmd_timeout = qca_cmd_timeout;
1607         } else if (ret == -ENOENT) {
1608                 /* No patch/nvm-config found, run with original fw/config */
1609                 ret = 0;
1610         } else if (ret == -EAGAIN) {
1611                 /*
1612                  * Userspace firmware loader will return -EAGAIN in case no
1613                  * patch/nvm-config is found, so run with original fw/config.
1614                  */
1615                 ret = 0;
1616         }
1617
1618         /* Setup bdaddr */
1619         if (qca_is_wcn399x(soc_type))
1620                 hu->hdev->set_bdaddr = qca_set_bdaddr;
1621         else
1622                 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1623
1624         return ret;
1625 }
1626
1627 static const struct hci_uart_proto qca_proto = {
1628         .id             = HCI_UART_QCA,
1629         .name           = "QCA",
1630         .manufacturer   = 29,
1631         .init_speed     = 115200,
1632         .oper_speed     = 3000000,
1633         .open           = qca_open,
1634         .close          = qca_close,
1635         .flush          = qca_flush,
1636         .setup          = qca_setup,
1637         .recv           = qca_recv,
1638         .enqueue        = qca_enqueue,
1639         .dequeue        = qca_dequeue,
1640 };
1641
1642 static const struct qca_vreg_data qca_soc_data_wcn3990 = {
1643         .soc_type = QCA_WCN3990,
1644         .vregs = (struct qca_vreg []) {
1645                 { "vddio", 15000  },
1646                 { "vddxo", 80000  },
1647                 { "vddrf", 300000 },
1648                 { "vddch0", 450000 },
1649         },
1650         .num_vregs = 4,
1651 };
1652
1653 static const struct qca_vreg_data qca_soc_data_wcn3991 = {
1654         .soc_type = QCA_WCN3991,
1655         .vregs = (struct qca_vreg []) {
1656                 { "vddio", 15000  },
1657                 { "vddxo", 80000  },
1658                 { "vddrf", 300000 },
1659                 { "vddch0", 450000 },
1660         },
1661         .num_vregs = 4,
1662 };
1663
1664 static const struct qca_vreg_data qca_soc_data_wcn3998 = {
1665         .soc_type = QCA_WCN3998,
1666         .vregs = (struct qca_vreg []) {
1667                 { "vddio", 10000  },
1668                 { "vddxo", 80000  },
1669                 { "vddrf", 300000 },
1670                 { "vddch0", 450000 },
1671         },
1672         .num_vregs = 4,
1673 };
1674
1675 static void qca_power_shutdown(struct hci_uart *hu)
1676 {
1677         struct qca_serdev *qcadev;
1678         struct qca_data *qca = hu->priv;
1679         unsigned long flags;
1680         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1681
1682         qcadev = serdev_device_get_drvdata(hu->serdev);
1683
1684         /* From this point we go into power off state. But serial port is
1685          * still open, stop queueing the IBS data and flush all the buffered
1686          * data in skb's.
1687          */
1688         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1689         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1690         qca_flush(hu);
1691         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1692
1693         hu->hdev->hw_error = NULL;
1694         hu->hdev->cmd_timeout = NULL;
1695
1696         /* Non-serdev device usually is powered by external power
1697          * and don't need additional action in driver for power down
1698          */
1699         if (!hu->serdev)
1700                 return;
1701
1702         if (qca_is_wcn399x(soc_type)) {
1703                 host_set_baudrate(hu, 2400);
1704                 qca_send_power_pulse(hu, false);
1705                 qca_regulator_disable(qcadev);
1706         } else {
1707                 gpiod_set_value_cansleep(qcadev->bt_en, 0);
1708         }
1709 }
1710
1711 static int qca_power_off(struct hci_dev *hdev)
1712 {
1713         struct hci_uart *hu = hci_get_drvdata(hdev);
1714         struct qca_data *qca = hu->priv;
1715
1716         /* Stop sending shutdown command if soc crashes. */
1717         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1718                 qca_send_pre_shutdown_cmd(hdev);
1719                 usleep_range(8000, 10000);
1720         }
1721
1722         qca->memdump_state = QCA_MEMDUMP_IDLE;
1723         qca_power_shutdown(hu);
1724         return 0;
1725 }
1726
1727 static int qca_regulator_enable(struct qca_serdev *qcadev)
1728 {
1729         struct qca_power *power = qcadev->bt_power;
1730         int ret;
1731
1732         /* Already enabled */
1733         if (power->vregs_on)
1734                 return 0;
1735
1736         BT_DBG("enabling %d regulators)", power->num_vregs);
1737
1738         ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
1739         if (ret)
1740                 return ret;
1741
1742         power->vregs_on = true;
1743
1744         return 0;
1745 }
1746
1747 static void qca_regulator_disable(struct qca_serdev *qcadev)
1748 {
1749         struct qca_power *power;
1750
1751         if (!qcadev)
1752                 return;
1753
1754         power = qcadev->bt_power;
1755
1756         /* Already disabled? */
1757         if (!power->vregs_on)
1758                 return;
1759
1760         regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
1761         power->vregs_on = false;
1762 }
1763
1764 static int qca_init_regulators(struct qca_power *qca,
1765                                 const struct qca_vreg *vregs, size_t num_vregs)
1766 {
1767         struct regulator_bulk_data *bulk;
1768         int ret;
1769         int i;
1770
1771         bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
1772         if (!bulk)
1773                 return -ENOMEM;
1774
1775         for (i = 0; i < num_vregs; i++)
1776                 bulk[i].supply = vregs[i].name;
1777
1778         ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
1779         if (ret < 0)
1780                 return ret;
1781
1782         for (i = 0; i < num_vregs; i++) {
1783                 ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
1784                 if (ret)
1785                         return ret;
1786         }
1787
1788         qca->vreg_bulk = bulk;
1789         qca->num_vregs = num_vregs;
1790
1791         return 0;
1792 }
1793
1794 static int qca_serdev_probe(struct serdev_device *serdev)
1795 {
1796         struct qca_serdev *qcadev;
1797         const struct qca_vreg_data *data;
1798         int err;
1799
1800         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1801         if (!qcadev)
1802                 return -ENOMEM;
1803
1804         qcadev->serdev_hu.serdev = serdev;
1805         data = device_get_match_data(&serdev->dev);
1806         serdev_device_set_drvdata(serdev, qcadev);
1807         device_property_read_string(&serdev->dev, "firmware-name",
1808                                          &qcadev->firmware_name);
1809         if (data && qca_is_wcn399x(data->soc_type)) {
1810                 qcadev->btsoc_type = data->soc_type;
1811                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1812                                                 sizeof(struct qca_power),
1813                                                 GFP_KERNEL);
1814                 if (!qcadev->bt_power)
1815                         return -ENOMEM;
1816
1817                 qcadev->bt_power->dev = &serdev->dev;
1818                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1819                                           data->num_vregs);
1820                 if (err) {
1821                         BT_ERR("Failed to init regulators:%d", err);
1822                         goto out;
1823                 }
1824
1825                 qcadev->bt_power->vregs_on = false;
1826
1827                 device_property_read_u32(&serdev->dev, "max-speed",
1828                                          &qcadev->oper_speed);
1829                 if (!qcadev->oper_speed)
1830                         BT_DBG("UART will pick default operating speed");
1831
1832                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1833                 if (err) {
1834                         BT_ERR("wcn3990 serdev registration failed");
1835                         goto out;
1836                 }
1837         } else {
1838                 qcadev->btsoc_type = QCA_ROME;
1839                 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1840                                                GPIOD_OUT_LOW);
1841                 if (IS_ERR(qcadev->bt_en)) {
1842                         dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1843                         return PTR_ERR(qcadev->bt_en);
1844                 }
1845
1846                 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1847                 if (IS_ERR(qcadev->susclk)) {
1848                         dev_err(&serdev->dev, "failed to acquire clk\n");
1849                         return PTR_ERR(qcadev->susclk);
1850                 }
1851
1852                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1853                 if (err)
1854                         return err;
1855
1856                 err = clk_prepare_enable(qcadev->susclk);
1857                 if (err)
1858                         return err;
1859
1860                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1861                 if (err)
1862                         clk_disable_unprepare(qcadev->susclk);
1863         }
1864
1865 out:    return err;
1866
1867 }
1868
1869 static void qca_serdev_remove(struct serdev_device *serdev)
1870 {
1871         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1872
1873         if (qca_is_wcn399x(qcadev->btsoc_type))
1874                 qca_power_shutdown(&qcadev->serdev_hu);
1875         else
1876                 clk_disable_unprepare(qcadev->susclk);
1877
1878         hci_uart_unregister_device(&qcadev->serdev_hu);
1879 }
1880
1881 static int __maybe_unused qca_suspend(struct device *dev)
1882 {
1883         struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
1884         struct hci_uart *hu = hci_get_drvdata(hdev);
1885         struct qca_data *qca = hu->priv;
1886         unsigned long flags;
1887         int ret = 0;
1888         u8 cmd;
1889
1890         set_bit(QCA_SUSPENDING, &qca->flags);
1891
1892         /* Device is downloading patch or doesn't support in-band sleep. */
1893         if (!test_bit(QCA_IBS_ENABLED, &qca->flags))
1894                 return 0;
1895
1896         cancel_work_sync(&qca->ws_awake_device);
1897         cancel_work_sync(&qca->ws_awake_rx);
1898
1899         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
1900                                  flags, SINGLE_DEPTH_NESTING);
1901
1902         switch (qca->tx_ibs_state) {
1903         case HCI_IBS_TX_WAKING:
1904                 del_timer(&qca->wake_retrans_timer);
1905                 /* Fall through */
1906         case HCI_IBS_TX_AWAKE:
1907                 del_timer(&qca->tx_idle_timer);
1908
1909                 serdev_device_write_flush(hu->serdev);
1910                 cmd = HCI_IBS_SLEEP_IND;
1911                 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1912
1913                 if (ret < 0) {
1914                         BT_ERR("Failed to send SLEEP to device");
1915                         break;
1916                 }
1917
1918                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
1919                 qca->ibs_sent_slps++;
1920
1921                 qca_wq_serial_tx_clock_vote_off(&qca->ws_tx_vote_off);
1922                 break;
1923
1924         case HCI_IBS_TX_ASLEEP:
1925                 break;
1926
1927         default:
1928                 BT_ERR("Spurious tx state %d", qca->tx_ibs_state);
1929                 ret = -EINVAL;
1930                 break;
1931         }
1932
1933         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1934
1935         if (ret < 0)
1936                 goto error;
1937
1938         serdev_device_wait_until_sent(hu->serdev,
1939                                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1940
1941         /* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going
1942          * to sleep, so that the packet does not wake the system later.
1943          */
1944
1945         ret = wait_event_interruptible_timeout(qca->suspend_wait_q,
1946                         qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
1947                         msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
1948
1949         if (ret > 0)
1950                 return 0;
1951
1952         if (ret == 0)
1953                 ret = -ETIMEDOUT;
1954
1955 error:
1956         clear_bit(QCA_SUSPENDING, &qca->flags);
1957
1958         return ret;
1959 }
1960
1961 static int __maybe_unused qca_resume(struct device *dev)
1962 {
1963         struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
1964         struct hci_uart *hu = hci_get_drvdata(hdev);
1965         struct qca_data *qca = hu->priv;
1966
1967         clear_bit(QCA_SUSPENDING, &qca->flags);
1968
1969         return 0;
1970 }
1971
1972 static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume);
1973
1974 static const struct of_device_id qca_bluetooth_of_match[] = {
1975         { .compatible = "qcom,qca6174-bt" },
1976         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
1977         { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
1978         { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
1979         { /* sentinel */ }
1980 };
1981 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1982
1983 static struct serdev_device_driver qca_serdev_driver = {
1984         .probe = qca_serdev_probe,
1985         .remove = qca_serdev_remove,
1986         .driver = {
1987                 .name = "hci_uart_qca",
1988                 .of_match_table = qca_bluetooth_of_match,
1989                 .pm = &qca_pm_ops,
1990         },
1991 };
1992
1993 int __init qca_init(void)
1994 {
1995         serdev_device_driver_register(&qca_serdev_driver);
1996
1997         return hci_uart_register_proto(&qca_proto);
1998 }
1999
2000 int __exit qca_deinit(void)
2001 {
2002         serdev_device_driver_unregister(&qca_serdev_driver);
2003
2004         return hci_uart_unregister_proto(&qca_proto);
2005 }