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 <linux/mutex.h>
  33 #include <asm/unaligned.h>
  34
  35 #include <net/bluetooth/bluetooth.h>
  36 #include <net/bluetooth/hci_core.h>
  37
  38 #include "hci_uart.h"
  39 #include "btqca.h"
  40
  41 /* HCI_IBS protocol messages */
  42 #define HCI_IBS_SLEEP_IND       0xFE
  43 #define HCI_IBS_WAKE_IND        0xFD
  44 #define HCI_IBS_WAKE_ACK        0xFC
  45 #define HCI_MAX_IBS_SIZE        10
  46
  47 #define IBS_WAKE_RETRANS_TIMEOUT_MS     100
  48 #define IBS_BTSOC_TX_IDLE_TIMEOUT_MS    40
  49 #define IBS_HOST_TX_IDLE_TIMEOUT_MS     2000
  50 #define CMD_TRANS_TIMEOUT_MS            100
  51 #define MEMDUMP_TIMEOUT_MS              8000
  52
  53 /* susclk rate */
  54 #define SUSCLK_RATE_32KHZ       32768
  55
  56 /* Controller debug log header */
  57 #define QCA_DEBUG_HANDLE        0x2EDC
  58
  59 /* max retry count when init fails */
  60 #define MAX_INIT_RETRIES 3
  61
  62 /* Controller dump header */
  63 #define QCA_SSR_DUMP_HANDLE             0x0108
  64 #define QCA_DUMP_PACKET_SIZE            255
  65 #define QCA_LAST_SEQUENCE_NUM           0xFFFF
  66 #define QCA_CRASHBYTE_PACKET_LEN        1096
  67 #define QCA_MEMDUMP_BYTE                0xFB
  68
  69 enum qca_flags {
  70         QCA_IBS_ENABLED,
  71         QCA_DROP_VENDOR_EVENT,
  72         QCA_SUSPENDING,
  73         QCA_MEMDUMP_COLLECTION,
  74         QCA_HW_ERROR_EVENT
  75 };
  76
  77
  78 /* HCI_IBS transmit side sleep protocol states */
  79 enum tx_ibs_states {
  80         HCI_IBS_TX_ASLEEP,
  81         HCI_IBS_TX_WAKING,
  82         HCI_IBS_TX_AWAKE,
  83 };
  84
  85 /* HCI_IBS receive side sleep protocol states */
  86 enum rx_states {
  87         HCI_IBS_RX_ASLEEP,
  88         HCI_IBS_RX_AWAKE,
  89 };
  90
  91 /* HCI_IBS transmit and receive side clock state vote */
  92 enum hci_ibs_clock_state_vote {
  93         HCI_IBS_VOTE_STATS_UPDATE,
  94         HCI_IBS_TX_VOTE_CLOCK_ON,
  95         HCI_IBS_TX_VOTE_CLOCK_OFF,
  96         HCI_IBS_RX_VOTE_CLOCK_ON,
  97         HCI_IBS_RX_VOTE_CLOCK_OFF,
  98 };
  99
 100 /* Controller memory dump states */
 101 enum qca_memdump_states {
 102         QCA_MEMDUMP_IDLE,
 103         QCA_MEMDUMP_COLLECTING,
 104         QCA_MEMDUMP_COLLECTED,
 105         QCA_MEMDUMP_TIMEOUT,
 106 };
 107
 108 struct qca_memdump_data {
 109         char *memdump_buf_head;
 110         char *memdump_buf_tail;
 111         u32 current_seq_no;
 112         u32 received_dump;
 113 };
 114
 115 struct qca_memdump_event_hdr {
 116         __u8    evt;
 117         __u8    plen;
 118         __u16   opcode;
 119         __u16   seq_no;
 120         __u8    reserved;
 121 } __packed;
 122
 123
 124 struct qca_dump_size {
 125         u32 dump_size;
 126 } __packed;
 127
 128 struct qca_data {
 129         struct hci_uart *hu;
 130         struct sk_buff *rx_skb;
 131         struct sk_buff_head txq;
 132         struct sk_buff_head tx_wait_q;  /* HCI_IBS wait queue   */
 133         struct sk_buff_head rx_memdump_q;       /* Memdump wait queue   */
 134         spinlock_t hci_ibs_lock;        /* HCI_IBS state lock   */
 135         u8 tx_ibs_state;        /* HCI_IBS transmit side power state*/
 136         u8 rx_ibs_state;        /* HCI_IBS receive side power state */
 137         bool tx_vote;           /* Clock must be on for TX */
 138         bool rx_vote;           /* Clock must be on for RX */
 139         struct timer_list tx_idle_timer;
 140         u32 tx_idle_delay;
 141         struct timer_list wake_retrans_timer;
 142         u32 wake_retrans;
 143         struct workqueue_struct *workqueue;
 144         struct work_struct ws_awake_rx;
 145         struct work_struct ws_awake_device;
 146         struct work_struct ws_rx_vote_off;
 147         struct work_struct ws_tx_vote_off;
 148         struct work_struct ctrl_memdump_evt;
 149         struct delayed_work ctrl_memdump_timeout;
 150         struct qca_memdump_data *qca_memdump;
 151         unsigned long flags;
 152         struct completion drop_ev_comp;
 153         wait_queue_head_t suspend_wait_q;
 154         enum qca_memdump_states memdump_state;
 155         struct mutex hci_memdump_lock;
 156
 157         /* For debugging purpose */
 158         u64 ibs_sent_wacks;
 159         u64 ibs_sent_slps;
 160         u64 ibs_sent_wakes;
 161         u64 ibs_recv_wacks;
 162         u64 ibs_recv_slps;
 163         u64 ibs_recv_wakes;
 164         u64 vote_last_jif;
 165         u32 vote_on_ms;
 166         u32 vote_off_ms;
 167         u64 tx_votes_on;
 168         u64 rx_votes_on;
 169         u64 tx_votes_off;
 170         u64 rx_votes_off;
 171         u64 votes_on;
 172         u64 votes_off;
 173 };
 174
 175 enum qca_speed_type {
 176         QCA_INIT_SPEED = 1,
 177         QCA_OPER_SPEED
 178 };
 179
 180 /*
 181  * Voltage regulator information required for configuring the
 182  * QCA Bluetooth chipset
 183  */
 184 struct qca_vreg {
 185         const char *name;
 186         unsigned int load_uA;
 187 };
 188
 189 struct qca_vreg_data {
 190         enum qca_btsoc_type soc_type;
 191         struct qca_vreg *vregs;
 192         size_t num_vregs;
 193 };
 194
 195 /*
 196  * Platform data for the QCA Bluetooth power driver.
 197  */
 198 struct qca_power {
 199         struct device *dev;
 200         struct regulator_bulk_data *vreg_bulk;
 201         int num_vregs;
 202         bool vregs_on;
 203 };
 204
 205 struct qca_serdev {
 206         struct hci_uart  serdev_hu;
 207         struct gpio_desc *bt_en;
 208         struct clk       *susclk;
 209         enum qca_btsoc_type btsoc_type;
 210         struct qca_power *bt_power;
 211         u32 init_speed;
 212         u32 oper_speed;
 213         const char *firmware_name;
 214 };
 215
 216 static int qca_regulator_enable(struct qca_serdev *qcadev);
 217 static void qca_regulator_disable(struct qca_serdev *qcadev);
 218 static void qca_power_shutdown(struct hci_uart *hu);
 219 static int qca_power_off(struct hci_dev *hdev);
 220 static void qca_controller_memdump(struct work_struct *work);
 221
 222 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
 223 {
 224         enum qca_btsoc_type soc_type;
 225
 226         if (hu->serdev) {
 227                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 228
 229                 soc_type = qsd->btsoc_type;
 230         } else {
 231                 soc_type = QCA_ROME;
 232         }
 233
 234         return soc_type;
 235 }
 236
 237 static const char *qca_get_firmware_name(struct hci_uart *hu)
 238 {
 239         if (hu->serdev) {
 240                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 241
 242                 return qsd->firmware_name;
 243         } else {
 244                 return NULL;
 245         }
 246 }
 247
 248 static void __serial_clock_on(struct tty_struct *tty)
 249 {
 250         /* TODO: Some chipset requires to enable UART clock on client
 251          * side to save power consumption or manual work is required.
 252          * Please put your code to control UART clock here if needed
 253          */
 254 }
 255
 256 static void __serial_clock_off(struct tty_struct *tty)
 257 {
 258         /* TODO: Some chipset requires to disable UART clock on client
 259          * side to save power consumption or manual work is required.
 260          * Please put your code to control UART clock off here if needed
 261          */
 262 }
 263
 264 /* serial_clock_vote needs to be called with the ibs lock held */
 265 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
 266 {
 267         struct qca_data *qca = hu->priv;
 268         unsigned int diff;
 269
 270         bool old_vote = (qca->tx_vote | qca->rx_vote);
 271         bool new_vote;
 272
 273         switch (vote) {
 274         case HCI_IBS_VOTE_STATS_UPDATE:
 275                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 276
 277                 if (old_vote)
 278                         qca->vote_off_ms += diff;
 279                 else
 280                         qca->vote_on_ms += diff;
 281                 return;
 282
 283         case HCI_IBS_TX_VOTE_CLOCK_ON:
 284                 qca->tx_vote = true;
 285                 qca->tx_votes_on++;
 286                 new_vote = true;
 287                 break;
 288
 289         case HCI_IBS_RX_VOTE_CLOCK_ON:
 290                 qca->rx_vote = true;
 291                 qca->rx_votes_on++;
 292                 new_vote = true;
 293                 break;
 294
 295         case HCI_IBS_TX_VOTE_CLOCK_OFF:
 296                 qca->tx_vote = false;
 297                 qca->tx_votes_off++;
 298                 new_vote = qca->rx_vote | qca->tx_vote;
 299                 break;
 300
 301         case HCI_IBS_RX_VOTE_CLOCK_OFF:
 302                 qca->rx_vote = false;
 303                 qca->rx_votes_off++;
 304                 new_vote = qca->rx_vote | qca->tx_vote;
 305                 break;
 306
 307         default:
 308                 BT_ERR("Voting irregularity");
 309                 return;
 310         }
 311
 312         if (new_vote != old_vote) {
 313                 if (new_vote)
 314                         __serial_clock_on(hu->tty);
 315                 else
 316                         __serial_clock_off(hu->tty);
 317
 318                 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
 319                        vote ? "true" : "false");
 320
 321                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 322
 323                 if (new_vote) {
 324                         qca->votes_on++;
 325                         qca->vote_off_ms += diff;
 326                 } else {
 327                         qca->votes_off++;
 328                         qca->vote_on_ms += diff;
 329                 }
 330                 qca->vote_last_jif = jiffies;
 331         }
 332 }
 333
 334 /* Builds and sends an HCI_IBS command packet.
 335  * These are very simple packets with only 1 cmd byte.
 336  */
 337 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
 338 {
 339         int err = 0;
 340         struct sk_buff *skb = NULL;
 341         struct qca_data *qca = hu->priv;
 342
 343         BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
 344
 345         skb = bt_skb_alloc(1, GFP_ATOMIC);
 346         if (!skb) {
 347                 BT_ERR("Failed to allocate memory for HCI_IBS packet");
 348                 return -ENOMEM;
 349         }
 350
 351         /* Assign HCI_IBS type */
 352         skb_put_u8(skb, cmd);
 353
 354         skb_queue_tail(&qca->txq, skb);
 355
 356         return err;
 357 }
 358
 359 static void qca_wq_awake_device(struct work_struct *work)
 360 {
 361         struct qca_data *qca = container_of(work, struct qca_data,
 362                                             ws_awake_device);
 363         struct hci_uart *hu = qca->hu;
 364         unsigned long retrans_delay;
 365         unsigned long flags;
 366
 367         BT_DBG("hu %p wq awake device", hu);
 368
 369         /* Vote for serial clock */
 370         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
 371
 372         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 373
 374         /* Send wake indication to device */
 375         if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
 376                 BT_ERR("Failed to send WAKE to device");
 377
 378         qca->ibs_sent_wakes++;
 379
 380         /* Start retransmit timer */
 381         retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 382         mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 383
 384         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 385
 386         /* Actually send the packets */
 387         hci_uart_tx_wakeup(hu);
 388 }
 389
 390 static void qca_wq_awake_rx(struct work_struct *work)
 391 {
 392         struct qca_data *qca = container_of(work, struct qca_data,
 393                                             ws_awake_rx);
 394         struct hci_uart *hu = qca->hu;
 395         unsigned long flags;
 396
 397         BT_DBG("hu %p wq awake rx", hu);
 398
 399         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
 400
 401         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 402         qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
 403
 404         /* Always acknowledge device wake up,
 405          * sending IBS message doesn't count as TX ON.
 406          */
 407         if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
 408                 BT_ERR("Failed to acknowledge device wake up");
 409
 410         qca->ibs_sent_wacks++;
 411
 412         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 413
 414         /* Actually send the packets */
 415         hci_uart_tx_wakeup(hu);
 416 }
 417
 418 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
 419 {
 420         struct qca_data *qca = container_of(work, struct qca_data,
 421                                             ws_rx_vote_off);
 422         struct hci_uart *hu = qca->hu;
 423
 424         BT_DBG("hu %p rx clock vote off", hu);
 425
 426         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
 427 }
 428
 429 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
 430 {
 431         struct qca_data *qca = container_of(work, struct qca_data,
 432                                             ws_tx_vote_off);
 433         struct hci_uart *hu = qca->hu;
 434
 435         BT_DBG("hu %p tx clock vote off", hu);
 436
 437         /* Run HCI tx handling unlocked */
 438         hci_uart_tx_wakeup(hu);
 439
 440         /* Now that message queued to tty driver, vote for tty clocks off.
 441          * It is up to the tty driver to pend the clocks off until tx done.
 442          */
 443         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
 444 }
 445
 446 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 447 {
 448         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 449         struct hci_uart *hu = qca->hu;
 450         unsigned long flags;
 451
 452         BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
 453
 454         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 455                                  flags, SINGLE_DEPTH_NESTING);
 456
 457         switch (qca->tx_ibs_state) {
 458         case HCI_IBS_TX_AWAKE:
 459                 /* TX_IDLE, go to SLEEP */
 460                 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
 461                         BT_ERR("Failed to send SLEEP to device");
 462                         break;
 463                 }
 464                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 465                 qca->ibs_sent_slps++;
 466                 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
 467                 break;
 468
 469         case HCI_IBS_TX_ASLEEP:
 470         case HCI_IBS_TX_WAKING:
 471                 /* Fall through */
 472
 473         default:
 474                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 475                 break;
 476         }
 477
 478         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 479 }
 480
 481 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 482 {
 483         struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
 484         struct hci_uart *hu = qca->hu;
 485         unsigned long flags, retrans_delay;
 486         bool retransmit = false;
 487
 488         BT_DBG("hu %p wake retransmit timeout in %d state",
 489                 hu, qca->tx_ibs_state);
 490
 491         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 492                                  flags, SINGLE_DEPTH_NESTING);
 493
 494         /* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */
 495         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 496                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 497                 return;
 498         }
 499
 500         switch (qca->tx_ibs_state) {
 501         case HCI_IBS_TX_WAKING:
 502                 /* No WAKE_ACK, retransmit WAKE */
 503                 retransmit = true;
 504                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
 505                         BT_ERR("Failed to acknowledge device wake up");
 506                         break;
 507                 }
 508                 qca->ibs_sent_wakes++;
 509                 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 510                 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 511                 break;
 512
 513         case HCI_IBS_TX_ASLEEP:
 514         case HCI_IBS_TX_AWAKE:
 515                 /* Fall through */
 516
 517         default:
 518                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 519                 break;
 520         }
 521
 522         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 523
 524         if (retransmit)
 525                 hci_uart_tx_wakeup(hu);
 526 }
 527
 528
 529 static void qca_controller_memdump_timeout(struct work_struct *work)
 530 {
 531         struct qca_data *qca = container_of(work, struct qca_data,
 532                                         ctrl_memdump_timeout.work);
 533         struct hci_uart *hu = qca->hu;
 534
 535         mutex_lock(&qca->hci_memdump_lock);
 536         if (test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
 537                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
 538                 if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
 539                         /* Inject hw error event to reset the device
 540                          * and driver.
 541                          */
 542                         hci_reset_dev(hu->hdev);
 543                 }
 544         }
 545
 546         mutex_unlock(&qca->hci_memdump_lock);
 547 }
 548
 549
 550 /* Initialize protocol */
 551 static int qca_open(struct hci_uart *hu)
 552 {
 553         struct qca_serdev *qcadev;
 554         struct qca_data *qca;
 555
 556         BT_DBG("hu %p qca_open", hu);
 557
 558         if (!hci_uart_has_flow_control(hu))
 559                 return -EOPNOTSUPP;
 560
 561         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 562         if (!qca)
 563                 return -ENOMEM;
 564
 565         skb_queue_head_init(&qca->txq);
 566         skb_queue_head_init(&qca->tx_wait_q);
 567         skb_queue_head_init(&qca->rx_memdump_q);
 568         spin_lock_init(&qca->hci_ibs_lock);
 569         mutex_init(&qca->hci_memdump_lock);
 570         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 571         if (!qca->workqueue) {
 572                 BT_ERR("QCA Workqueue not initialized properly");
 573                 kfree(qca);
 574                 return -ENOMEM;
 575         }
 576
 577         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 578         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 579         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 580         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 581         INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
 582         INIT_DELAYED_WORK(&qca->ctrl_memdump_timeout,
 583                           qca_controller_memdump_timeout);
 584         init_waitqueue_head(&qca->suspend_wait_q);
 585
 586         qca->hu = hu;
 587         init_completion(&qca->drop_ev_comp);
 588
 589         /* Assume we start with both sides asleep -- extra wakes OK */
 590         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 591         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 592
 593         qca->vote_last_jif = jiffies;
 594
 595         hu->priv = qca;
 596
 597         if (hu->serdev) {
 598                 qcadev = serdev_device_get_drvdata(hu->serdev);
 599                 if (qca_is_wcn399x(qcadev->btsoc_type)) {
 600                         hu->init_speed = qcadev->init_speed;
 601                         hu->oper_speed = qcadev->oper_speed;
 602                 }
 603         }
 604
 605         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 606         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 607
 608         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 609         qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS;
 610
 611         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 612                qca->tx_idle_delay, qca->wake_retrans);
 613
 614         return 0;
 615 }
 616
 617 static void qca_debugfs_init(struct hci_dev *hdev)
 618 {
 619         struct hci_uart *hu = hci_get_drvdata(hdev);
 620         struct qca_data *qca = hu->priv;
 621         struct dentry *ibs_dir;
 622         umode_t mode;
 623
 624         if (!hdev->debugfs)
 625                 return;
 626
 627         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 628
 629         /* read only */
 630         mode = S_IRUGO;
 631         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 632         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 633         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 634                            &qca->ibs_sent_slps);
 635         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 636                            &qca->ibs_sent_wakes);
 637         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 638                            &qca->ibs_sent_wacks);
 639         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 640                            &qca->ibs_recv_slps);
 641         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 642                            &qca->ibs_recv_wakes);
 643         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 644                            &qca->ibs_recv_wacks);
 645         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 646         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 647         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 648         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 649         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 650         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 651         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 652         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 653         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 654         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 655
 656         /* read/write */
 657         mode = S_IRUGO | S_IWUSR;
 658         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 659         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 660                            &qca->tx_idle_delay);
 661 }
 662
 663 /* Flush protocol data */
 664 static int qca_flush(struct hci_uart *hu)
 665 {
 666         struct qca_data *qca = hu->priv;
 667
 668         BT_DBG("hu %p qca flush", hu);
 669
 670         skb_queue_purge(&qca->tx_wait_q);
 671         skb_queue_purge(&qca->txq);
 672
 673         return 0;
 674 }
 675
 676 /* Close protocol */
 677 static int qca_close(struct hci_uart *hu)
 678 {
 679         struct qca_data *qca = hu->priv;
 680
 681         BT_DBG("hu %p qca close", hu);
 682
 683         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 684
 685         skb_queue_purge(&qca->tx_wait_q);
 686         skb_queue_purge(&qca->txq);
 687         skb_queue_purge(&qca->rx_memdump_q);
 688         del_timer(&qca->tx_idle_timer);
 689         del_timer(&qca->wake_retrans_timer);
 690         destroy_workqueue(qca->workqueue);
 691         qca->hu = NULL;
 692
 693         qca_power_shutdown(hu);
 694
 695         kfree_skb(qca->rx_skb);
 696
 697         hu->priv = NULL;
 698
 699         kfree(qca);
 700
 701         return 0;
 702 }
 703
 704 /* Called upon a wake-up-indication from the device.
 705  */
 706 static void device_want_to_wakeup(struct hci_uart *hu)
 707 {
 708         unsigned long flags;
 709         struct qca_data *qca = hu->priv;
 710
 711         BT_DBG("hu %p want to wake up", hu);
 712
 713         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 714
 715         qca->ibs_recv_wakes++;
 716
 717         /* Don't wake the rx up when suspending. */
 718         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 719                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 720                 return;
 721         }
 722
 723         switch (qca->rx_ibs_state) {
 724         case HCI_IBS_RX_ASLEEP:
 725                 /* Make sure clock is on - we may have turned clock off since
 726                  * receiving the wake up indicator awake rx clock.
 727                  */
 728                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 729                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 730                 return;
 731
 732         case HCI_IBS_RX_AWAKE:
 733                 /* Always acknowledge device wake up,
 734                  * sending IBS message doesn't count as TX ON.
 735                  */
 736                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 737                         BT_ERR("Failed to acknowledge device wake up");
 738                         break;
 739                 }
 740                 qca->ibs_sent_wacks++;
 741                 break;
 742
 743         default:
 744                 /* Any other state is illegal */
 745                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 746                        qca->rx_ibs_state);
 747                 break;
 748         }
 749
 750         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 751
 752         /* Actually send the packets */
 753         hci_uart_tx_wakeup(hu);
 754 }
 755
 756 /* Called upon a sleep-indication from the device.
 757  */
 758 static void device_want_to_sleep(struct hci_uart *hu)
 759 {
 760         unsigned long flags;
 761         struct qca_data *qca = hu->priv;
 762
 763         BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);
 764
 765         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 766
 767         qca->ibs_recv_slps++;
 768
 769         switch (qca->rx_ibs_state) {
 770         case HCI_IBS_RX_AWAKE:
 771                 /* Update state */
 772                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 773                 /* Vote off rx clock under workqueue */
 774                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 775                 break;
 776
 777         case HCI_IBS_RX_ASLEEP:
 778                 break;
 779
 780         default:
 781                 /* Any other state is illegal */
 782                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 783                        qca->rx_ibs_state);
 784                 break;
 785         }
 786
 787         wake_up_interruptible(&qca->suspend_wait_q);
 788
 789         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 790 }
 791
 792 /* Called upon wake-up-acknowledgement from the device
 793  */
 794 static void device_woke_up(struct hci_uart *hu)
 795 {
 796         unsigned long flags, idle_delay;
 797         struct qca_data *qca = hu->priv;
 798         struct sk_buff *skb = NULL;
 799
 800         BT_DBG("hu %p woke up", hu);
 801
 802         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 803
 804         qca->ibs_recv_wacks++;
 805
 806         /* Don't react to the wake-up-acknowledgment when suspending. */
 807         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 808                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 809                 return;
 810         }
 811
 812         switch (qca->tx_ibs_state) {
 813         case HCI_IBS_TX_AWAKE:
 814                 /* Expect one if we send 2 WAKEs */
 815                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 816                        qca->tx_ibs_state);
 817                 break;
 818
 819         case HCI_IBS_TX_WAKING:
 820                 /* Send pending packets */
 821                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 822                         skb_queue_tail(&qca->txq, skb);
 823
 824                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 825                 del_timer(&qca->wake_retrans_timer);
 826                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 827                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 828                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 829                 break;
 830
 831         case HCI_IBS_TX_ASLEEP:
 832                 /* Fall through */
 833
 834         default:
 835                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 836                        qca->tx_ibs_state);
 837                 break;
 838         }
 839
 840         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 841
 842         /* Actually send the packets */
 843         hci_uart_tx_wakeup(hu);
 844 }
 845
 846 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 847  * two simultaneous tasklets.
 848  */
 849 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 850 {
 851         unsigned long flags = 0, idle_delay;
 852         struct qca_data *qca = hu->priv;
 853
 854         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 855                qca->tx_ibs_state);
 856
 857         /* Prepend skb with frame type */
 858         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 859
 860         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 861
 862         /* Don't go to sleep in middle of patch download or
 863          * Out-Of-Band(GPIOs control) sleep is selected.
 864          * Don't wake the device up when suspending.
 865          */
 866         if (!test_bit(QCA_IBS_ENABLED, &qca->flags) ||
 867             test_bit(QCA_SUSPENDING, &qca->flags)) {
 868                 skb_queue_tail(&qca->txq, skb);
 869                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 870                 return 0;
 871         }
 872
 873         /* Act according to current state */
 874         switch (qca->tx_ibs_state) {
 875         case HCI_IBS_TX_AWAKE:
 876                 BT_DBG("Device awake, sending normally");
 877                 skb_queue_tail(&qca->txq, skb);
 878                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 879                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 880                 break;
 881
 882         case HCI_IBS_TX_ASLEEP:
 883                 BT_DBG("Device asleep, waking up and queueing packet");
 884                 /* Save packet for later */
 885                 skb_queue_tail(&qca->tx_wait_q, skb);
 886
 887                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 888                 /* Schedule a work queue to wake up device */
 889                 queue_work(qca->workqueue, &qca->ws_awake_device);
 890                 break;
 891
 892         case HCI_IBS_TX_WAKING:
 893                 BT_DBG("Device waking up, queueing packet");
 894                 /* Transient state; just keep packet for later */
 895                 skb_queue_tail(&qca->tx_wait_q, skb);
 896                 break;
 897
 898         default:
 899                 BT_ERR("Illegal tx state: %d (losing packet)",
 900                        qca->tx_ibs_state);
 901                 kfree_skb(skb);
 902                 break;
 903         }
 904
 905         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 906
 907         return 0;
 908 }
 909
 910 static int qca_ibs_sleep_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_SLEEP_IND);
 915
 916         device_want_to_sleep(hu);
 917
 918         kfree_skb(skb);
 919         return 0;
 920 }
 921
 922 static int qca_ibs_wake_ind(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_IND);
 927
 928         device_want_to_wakeup(hu);
 929
 930         kfree_skb(skb);
 931         return 0;
 932 }
 933
 934 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 935 {
 936         struct hci_uart *hu = hci_get_drvdata(hdev);
 937
 938         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 939
 940         device_woke_up(hu);
 941
 942         kfree_skb(skb);
 943         return 0;
 944 }
 945
 946 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 947 {
 948         /* We receive debug logs from chip as an ACL packets.
 949          * Instead of sending the data to ACL to decode the
 950          * received data, we are pushing them to the above layers
 951          * as a diagnostic packet.
 952          */
 953         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 954                 return hci_recv_diag(hdev, skb);
 955
 956         return hci_recv_frame(hdev, skb);
 957 }
 958
 959 static void qca_controller_memdump(struct work_struct *work)
 960 {
 961         struct qca_data *qca = container_of(work, struct qca_data,
 962                                             ctrl_memdump_evt);
 963         struct hci_uart *hu = qca->hu;
 964         struct sk_buff *skb;
 965         struct qca_memdump_event_hdr *cmd_hdr;
 966         struct qca_memdump_data *qca_memdump = qca->qca_memdump;
 967         struct qca_dump_size *dump;
 968         char *memdump_buf;
 969         char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
 970         u16 seq_no;
 971         u32 dump_size;
 972
 973         while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
 974
 975                 mutex_lock(&qca->hci_memdump_lock);
 976                 /* Skip processing the received packets if timeout detected. */
 977                 if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT) {
 978                         mutex_unlock(&qca->hci_memdump_lock);
 979                         return;
 980                 }
 981
 982                 if (!qca_memdump) {
 983                         qca_memdump = kzalloc(sizeof(struct qca_memdump_data),
 984                                               GFP_ATOMIC);
 985                         if (!qca_memdump) {
 986                                 mutex_unlock(&qca->hci_memdump_lock);
 987                                 return;
 988                         }
 989
 990                         qca->qca_memdump = qca_memdump;
 991                 }
 992
 993                 qca->memdump_state = QCA_MEMDUMP_COLLECTING;
 994                 cmd_hdr = (void *) skb->data;
 995                 seq_no = __le16_to_cpu(cmd_hdr->seq_no);
 996                 skb_pull(skb, sizeof(struct qca_memdump_event_hdr));
 997
 998                 if (!seq_no) {
 999
1000                         /* This is the first frame of memdump packet from
1001                          * the controller, Disable IBS to recevie dump
1002                          * with out any interruption, ideally time required for
1003                          * the controller to send the dump is 8 seconds. let us
1004                          * start timer to handle this asynchronous activity.
1005                          */
1006                         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1007                         set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1008                         dump = (void *) skb->data;
1009                         dump_size = __le32_to_cpu(dump->dump_size);
1010                         if (!(dump_size)) {
1011                                 bt_dev_err(hu->hdev, "Rx invalid memdump size");
1012                                 kfree_skb(skb);
1013                                 mutex_unlock(&qca->hci_memdump_lock);
1014                                 return;
1015                         }
1016
1017                         bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
1018                                     dump_size);
1019                         queue_delayed_work(qca->workqueue,
1020                                            &qca->ctrl_memdump_timeout,
1021                                         msecs_to_jiffies(MEMDUMP_TIMEOUT_MS));
1022
1023                         skb_pull(skb, sizeof(dump_size));
1024                         memdump_buf = vmalloc(dump_size);
1025                         qca_memdump->memdump_buf_head = memdump_buf;
1026                         qca_memdump->memdump_buf_tail = memdump_buf;
1027                 }
1028
1029                 memdump_buf = qca_memdump->memdump_buf_tail;
1030
1031                 /* If sequence no 0 is missed then there is no point in
1032                  * accepting the other sequences.
1033                  */
1034                 if (!memdump_buf) {
1035                         bt_dev_err(hu->hdev, "QCA: Discarding other packets");
1036                         kfree(qca_memdump);
1037                         kfree_skb(skb);
1038                         qca->qca_memdump = NULL;
1039                         mutex_unlock(&qca->hci_memdump_lock);
1040                         return;
1041                 }
1042
1043                 /* There could be chance of missing some packets from
1044                  * the controller. In such cases let us store the dummy
1045                  * packets in the buffer.
1046                  */
1047                 while ((seq_no > qca_memdump->current_seq_no + 1) &&
1048                         seq_no != QCA_LAST_SEQUENCE_NUM) {
1049                         bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
1050                                    qca_memdump->current_seq_no);
1051                         memcpy(memdump_buf, nullBuff, QCA_DUMP_PACKET_SIZE);
1052                         memdump_buf = memdump_buf + QCA_DUMP_PACKET_SIZE;
1053                         qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
1054                         qca_memdump->current_seq_no++;
1055                 }
1056
1057                 memcpy(memdump_buf, (unsigned char *) skb->data, skb->len);
1058                 memdump_buf = memdump_buf + skb->len;
1059                 qca_memdump->memdump_buf_tail = memdump_buf;
1060                 qca_memdump->current_seq_no = seq_no + 1;
1061                 qca_memdump->received_dump += skb->len;
1062                 qca->qca_memdump = qca_memdump;
1063                 kfree_skb(skb);
1064                 if (seq_no == QCA_LAST_SEQUENCE_NUM) {
1065                         bt_dev_info(hu->hdev, "QCA writing crash dump of size %d bytes",
1066                                    qca_memdump->received_dump);
1067                         memdump_buf = qca_memdump->memdump_buf_head;
1068                         dev_coredumpv(&hu->serdev->dev, memdump_buf,
1069                                       qca_memdump->received_dump, GFP_KERNEL);
1070                         cancel_delayed_work(&qca->ctrl_memdump_timeout);
1071                         kfree(qca->qca_memdump);
1072                         qca->qca_memdump = NULL;
1073                         qca->memdump_state = QCA_MEMDUMP_COLLECTED;
1074                         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1075                 }
1076
1077                 mutex_unlock(&qca->hci_memdump_lock);
1078         }
1079
1080 }
1081
1082 static int qca_controller_memdump_event(struct hci_dev *hdev,
1083                                         struct sk_buff *skb)
1084 {
1085         struct hci_uart *hu = hci_get_drvdata(hdev);
1086         struct qca_data *qca = hu->priv;
1087
1088         skb_queue_tail(&qca->rx_memdump_q, skb);
1089         queue_work(qca->workqueue, &qca->ctrl_memdump_evt);
1090
1091         return 0;
1092 }
1093
1094 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
1095 {
1096         struct hci_uart *hu = hci_get_drvdata(hdev);
1097         struct qca_data *qca = hu->priv;
1098
1099         if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
1100                 struct hci_event_hdr *hdr = (void *)skb->data;
1101
1102                 /* For the WCN3990 the vendor command for a baudrate change
1103                  * isn't sent as synchronous HCI command, because the
1104                  * controller sends the corresponding vendor event with the
1105                  * new baudrate. The event is received and properly decoded
1106                  * after changing the baudrate of the host port. It needs to
1107                  * be dropped, otherwise it can be misinterpreted as
1108                  * response to a later firmware download command (also a
1109                  * vendor command).
1110                  */
1111
1112                 if (hdr->evt == HCI_EV_VENDOR)
1113                         complete(&qca->drop_ev_comp);
1114
1115                 kfree_skb(skb);
1116
1117                 return 0;
1118         }
1119         /* We receive chip memory dump as an event packet, With a dedicated
1120          * handler followed by a hardware error event. When this event is
1121          * received we store dump into a file before closing hci. This
1122          * dump will help in triaging the issues.
1123          */
1124         if ((skb->data[0] == HCI_VENDOR_PKT) &&
1125             (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
1126                 return qca_controller_memdump_event(hdev, skb);
1127
1128         return hci_recv_frame(hdev, skb);
1129 }
1130
1131 #define QCA_IBS_SLEEP_IND_EVENT \
1132         .type = HCI_IBS_SLEEP_IND, \
1133         .hlen = 0, \
1134         .loff = 0, \
1135         .lsize = 0, \
1136         .maxlen = HCI_MAX_IBS_SIZE
1137
1138 #define QCA_IBS_WAKE_IND_EVENT \
1139         .type = HCI_IBS_WAKE_IND, \
1140         .hlen = 0, \
1141         .loff = 0, \
1142         .lsize = 0, \
1143         .maxlen = HCI_MAX_IBS_SIZE
1144
1145 #define QCA_IBS_WAKE_ACK_EVENT \
1146         .type = HCI_IBS_WAKE_ACK, \
1147         .hlen = 0, \
1148         .loff = 0, \
1149         .lsize = 0, \
1150         .maxlen = HCI_MAX_IBS_SIZE
1151
1152 static const struct h4_recv_pkt qca_recv_pkts[] = {
1153         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
1154         { H4_RECV_SCO,             .recv = hci_recv_frame    },
1155         { H4_RECV_EVENT,           .recv = qca_recv_event    },
1156         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
1157         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
1158         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
1159 };
1160
1161 static int qca_recv(struct hci_uart *hu, const void *data, int count)
1162 {
1163         struct qca_data *qca = hu->priv;
1164
1165         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
1166                 return -EUNATCH;
1167
1168         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
1169                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
1170         if (IS_ERR(qca->rx_skb)) {
1171                 int err = PTR_ERR(qca->rx_skb);
1172                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
1173                 qca->rx_skb = NULL;
1174                 return err;
1175         }
1176
1177         return count;
1178 }
1179
1180 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
1181 {
1182         struct qca_data *qca = hu->priv;
1183
1184         return skb_dequeue(&qca->txq);
1185 }
1186
1187 static uint8_t qca_get_baudrate_value(int speed)
1188 {
1189         switch (speed) {
1190         case 9600:
1191                 return QCA_BAUDRATE_9600;
1192         case 19200:
1193                 return QCA_BAUDRATE_19200;
1194         case 38400:
1195                 return QCA_BAUDRATE_38400;
1196         case 57600:
1197                 return QCA_BAUDRATE_57600;
1198         case 115200:
1199                 return QCA_BAUDRATE_115200;
1200         case 230400:
1201                 return QCA_BAUDRATE_230400;
1202         case 460800:
1203                 return QCA_BAUDRATE_460800;
1204         case 500000:
1205                 return QCA_BAUDRATE_500000;
1206         case 921600:
1207                 return QCA_BAUDRATE_921600;
1208         case 1000000:
1209                 return QCA_BAUDRATE_1000000;
1210         case 2000000:
1211                 return QCA_BAUDRATE_2000000;
1212         case 3000000:
1213                 return QCA_BAUDRATE_3000000;
1214         case 3200000:
1215                 return QCA_BAUDRATE_3200000;
1216         case 3500000:
1217                 return QCA_BAUDRATE_3500000;
1218         default:
1219                 return QCA_BAUDRATE_115200;
1220         }
1221 }
1222
1223 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
1224 {
1225         struct hci_uart *hu = hci_get_drvdata(hdev);
1226         struct qca_data *qca = hu->priv;
1227         struct sk_buff *skb;
1228         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
1229
1230         if (baudrate > QCA_BAUDRATE_3200000)
1231                 return -EINVAL;
1232
1233         cmd[4] = baudrate;
1234
1235         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1236         if (!skb) {
1237                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
1238                 return -ENOMEM;
1239         }
1240
1241         /* Assign commands to change baudrate and packet type. */
1242         skb_put_data(skb, cmd, sizeof(cmd));
1243         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1244
1245         skb_queue_tail(&qca->txq, skb);
1246         hci_uart_tx_wakeup(hu);
1247
1248         /* Wait for the baudrate change request to be sent */
1249
1250         while (!skb_queue_empty(&qca->txq))
1251                 usleep_range(100, 200);
1252
1253         if (hu->serdev)
1254                 serdev_device_wait_until_sent(hu->serdev,
1255                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1256
1257         /* Give the controller time to process the request */
1258         if (qca_is_wcn399x(qca_soc_type(hu)))
1259                 msleep(10);
1260         else
1261                 msleep(300);
1262
1263         return 0;
1264 }
1265
1266 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1267 {
1268         if (hu->serdev)
1269                 serdev_device_set_baudrate(hu->serdev, speed);
1270         else
1271                 hci_uart_set_baudrate(hu, speed);
1272 }
1273
1274 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1275 {
1276         int ret;
1277         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1278         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1279
1280         /* These power pulses are single byte command which are sent
1281          * at required baudrate to wcn3990. On wcn3990, we have an external
1282          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1283          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1284          * and also we use the same power inputs to turn on and off for
1285          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1286          * we send a power on pulse at 115200 bps. This algorithm will help to
1287          * save power. Disabling hardware flow control is mandatory while
1288          * sending power pulses to SoC.
1289          */
1290         bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1291
1292         serdev_device_write_flush(hu->serdev);
1293         hci_uart_set_flow_control(hu, true);
1294         ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1295         if (ret < 0) {
1296                 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1297                 return ret;
1298         }
1299
1300         serdev_device_wait_until_sent(hu->serdev, timeout);
1301         hci_uart_set_flow_control(hu, false);
1302
1303         /* Give to controller time to boot/shutdown */
1304         if (on)
1305                 msleep(100);
1306         else
1307                 msleep(10);
1308
1309         return 0;
1310 }
1311
1312 static unsigned int qca_get_speed(struct hci_uart *hu,
1313                                   enum qca_speed_type speed_type)
1314 {
1315         unsigned int speed = 0;
1316
1317         if (speed_type == QCA_INIT_SPEED) {
1318                 if (hu->init_speed)
1319                         speed = hu->init_speed;
1320                 else if (hu->proto->init_speed)
1321                         speed = hu->proto->init_speed;
1322         } else {
1323                 if (hu->oper_speed)
1324                         speed = hu->oper_speed;
1325                 else if (hu->proto->oper_speed)
1326                         speed = hu->proto->oper_speed;
1327         }
1328
1329         return speed;
1330 }
1331
1332 static int qca_check_speeds(struct hci_uart *hu)
1333 {
1334         if (qca_is_wcn399x(qca_soc_type(hu))) {
1335                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1336                     !qca_get_speed(hu, QCA_OPER_SPEED))
1337                         return -EINVAL;
1338         } else {
1339                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1340                     !qca_get_speed(hu, QCA_OPER_SPEED))
1341                         return -EINVAL;
1342         }
1343
1344         return 0;
1345 }
1346
1347 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1348 {
1349         unsigned int speed, qca_baudrate;
1350         struct qca_data *qca = hu->priv;
1351         int ret = 0;
1352
1353         if (speed_type == QCA_INIT_SPEED) {
1354                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1355                 if (speed)
1356                         host_set_baudrate(hu, speed);
1357         } else {
1358                 enum qca_btsoc_type soc_type = qca_soc_type(hu);
1359
1360                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1361                 if (!speed)
1362                         return 0;
1363
1364                 /* Disable flow control for wcn3990 to deassert RTS while
1365                  * changing the baudrate of chip and host.
1366                  */
1367                 if (qca_is_wcn399x(soc_type))
1368                         hci_uart_set_flow_control(hu, true);
1369
1370                 if (soc_type == QCA_WCN3990) {
1371                         reinit_completion(&qca->drop_ev_comp);
1372                         set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1373                 }
1374
1375                 qca_baudrate = qca_get_baudrate_value(speed);
1376                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1377                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1378                 if (ret)
1379                         goto error;
1380
1381                 host_set_baudrate(hu, speed);
1382
1383 error:
1384                 if (qca_is_wcn399x(soc_type))
1385                         hci_uart_set_flow_control(hu, false);
1386
1387                 if (soc_type == QCA_WCN3990) {
1388                         /* Wait for the controller to send the vendor event
1389                          * for the baudrate change command.
1390                          */
1391                         if (!wait_for_completion_timeout(&qca->drop_ev_comp,
1392                                                  msecs_to_jiffies(100))) {
1393                                 bt_dev_err(hu->hdev,
1394                                            "Failed to change controller baudrate\n");
1395                                 ret = -ETIMEDOUT;
1396                         }
1397
1398                         clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1399                 }
1400         }
1401
1402         return ret;
1403 }
1404
1405 static int qca_send_crashbuffer(struct hci_uart *hu)
1406 {
1407         struct qca_data *qca = hu->priv;
1408         struct sk_buff *skb;
1409
1410         skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
1411         if (!skb) {
1412                 bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
1413                 return -ENOMEM;
1414         }
1415
1416         /* We forcefully crash the controller, by sending 0xfb byte for
1417          * 1024 times. We also might have chance of losing data, To be
1418          * on safer side we send 1096 bytes to the SoC.
1419          */
1420         memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
1421                QCA_CRASHBYTE_PACKET_LEN);
1422         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1423         bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
1424         skb_queue_tail(&qca->txq, skb);
1425         hci_uart_tx_wakeup(hu);
1426
1427         return 0;
1428 }
1429
1430 static void qca_wait_for_dump_collection(struct hci_dev *hdev)
1431 {
1432         struct hci_uart *hu = hci_get_drvdata(hdev);
1433         struct qca_data *qca = hu->priv;
1434
1435         wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
1436                             TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);
1437
1438         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1439 }
1440
1441 static void qca_hw_error(struct hci_dev *hdev, u8 code)
1442 {
1443         struct hci_uart *hu = hci_get_drvdata(hdev);
1444         struct qca_data *qca = hu->priv;
1445         struct qca_memdump_data *qca_memdump = qca->qca_memdump;
1446         char *memdump_buf = NULL;
1447
1448         set_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1449         bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);
1450
1451         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1452                 /* If hardware error event received for other than QCA
1453                  * soc memory dump event, then we need to crash the SOC
1454                  * and wait here for 8 seconds to get the dump packets.
1455                  * This will block main thread to be on hold until we
1456                  * collect dump.
1457                  */
1458                 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1459                 qca_send_crashbuffer(hu);
1460                 qca_wait_for_dump_collection(hdev);
1461         } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1462                 /* Let us wait here until memory dump collected or
1463                  * memory dump timer expired.
1464                  */
1465                 bt_dev_info(hdev, "waiting for dump to complete");
1466                 qca_wait_for_dump_collection(hdev);
1467         }
1468
1469         if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1470                 bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
1471                 mutex_lock(&qca->hci_memdump_lock);
1472                 if (qca_memdump)
1473                         memdump_buf = qca_memdump->memdump_buf_head;
1474                 vfree(memdump_buf);
1475                 kfree(qca_memdump);
1476                 qca->qca_memdump = NULL;
1477                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1478                 cancel_delayed_work(&qca->ctrl_memdump_timeout);
1479                 skb_queue_purge(&qca->rx_memdump_q);
1480                 mutex_unlock(&qca->hci_memdump_lock);
1481                 cancel_work_sync(&qca->ctrl_memdump_evt);
1482         }
1483
1484         clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1485 }
1486
1487 static void qca_cmd_timeout(struct hci_dev *hdev)
1488 {
1489         struct hci_uart *hu = hci_get_drvdata(hdev);
1490         struct qca_data *qca = hu->priv;
1491
1492         if (qca->memdump_state == QCA_MEMDUMP_IDLE)
1493                 qca_send_crashbuffer(hu);
1494         else
1495                 bt_dev_info(hdev, "Dump collection is in process");
1496 }
1497
1498 static int qca_wcn3990_init(struct hci_uart *hu)
1499 {
1500         struct qca_serdev *qcadev;
1501         int ret;
1502
1503         /* Check for vregs status, may be hci down has turned
1504          * off the voltage regulator.
1505          */
1506         qcadev = serdev_device_get_drvdata(hu->serdev);
1507         if (!qcadev->bt_power->vregs_on) {
1508                 serdev_device_close(hu->serdev);
1509                 ret = qca_regulator_enable(qcadev);
1510                 if (ret)
1511                         return ret;
1512
1513                 ret = serdev_device_open(hu->serdev);
1514                 if (ret) {
1515                         bt_dev_err(hu->hdev, "failed to open port");
1516                         return ret;
1517                 }
1518         }
1519
1520         /* Forcefully enable wcn3990 to enter in to boot mode. */
1521         host_set_baudrate(hu, 2400);
1522         ret = qca_send_power_pulse(hu, false);
1523         if (ret)
1524                 return ret;
1525
1526         qca_set_speed(hu, QCA_INIT_SPEED);
1527         ret = qca_send_power_pulse(hu, true);
1528         if (ret)
1529                 return ret;
1530
1531         /* Now the device is in ready state to communicate with host.
1532          * To sync host with device we need to reopen port.
1533          * Without this, we will have RTS and CTS synchronization
1534          * issues.
1535          */
1536         serdev_device_close(hu->serdev);
1537         ret = serdev_device_open(hu->serdev);
1538         if (ret) {
1539                 bt_dev_err(hu->hdev, "failed to open port");
1540                 return ret;
1541         }
1542
1543         hci_uart_set_flow_control(hu, false);
1544
1545         return 0;
1546 }
1547
1548 static int qca_power_on(struct hci_dev *hdev)
1549 {
1550         struct hci_uart *hu = hci_get_drvdata(hdev);
1551         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1552         struct qca_serdev *qcadev;
1553         int ret = 0;
1554
1555         /* Non-serdev device usually is powered by external power
1556          * and don't need additional action in driver for power on
1557          */
1558         if (!hu->serdev)
1559                 return 0;
1560
1561         if (qca_is_wcn399x(soc_type)) {
1562                 ret = qca_wcn3990_init(hu);
1563         } else {
1564                 qcadev = serdev_device_get_drvdata(hu->serdev);
1565                 if (qcadev->bt_en) {
1566                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
1567                         /* Controller needs time to bootup. */
1568                         msleep(150);
1569                 }
1570         }
1571
1572         return ret;
1573 }
1574
1575 static int qca_setup(struct hci_uart *hu)
1576 {
1577         struct hci_dev *hdev = hu->hdev;
1578         struct qca_data *qca = hu->priv;
1579         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1580         unsigned int retries = 0;
1581         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1582         const char *firmware_name = qca_get_firmware_name(hu);
1583         int ret;
1584         int soc_ver = 0;
1585
1586         ret = qca_check_speeds(hu);
1587         if (ret)
1588                 return ret;
1589
1590         /* Patch downloading has to be done without IBS mode */
1591         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1592
1593         /* Enable controller to do both LE scan and BR/EDR inquiry
1594          * simultaneously.
1595          */
1596         set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
1597
1598         bt_dev_info(hdev, "setting up %s",
1599                 qca_is_wcn399x(soc_type) ? "wcn399x" : "ROME");
1600
1601 retry:
1602         ret = qca_power_on(hdev);
1603         if (ret)
1604                 return ret;
1605
1606         if (qca_is_wcn399x(soc_type)) {
1607                 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1608
1609                 ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
1610                 if (ret)
1611                         return ret;
1612         } else {
1613                 qca_set_speed(hu, QCA_INIT_SPEED);
1614         }
1615
1616         /* Setup user speed if needed */
1617         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1618         if (speed) {
1619                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1620                 if (ret)
1621                         return ret;
1622
1623                 qca_baudrate = qca_get_baudrate_value(speed);
1624         }
1625
1626         if (!qca_is_wcn399x(soc_type)) {
1627                 /* Get QCA version information */
1628                 ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
1629                 if (ret)
1630                         return ret;
1631         }
1632
1633         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1634         /* Setup patch / NVM configurations */
1635         ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver,
1636                         firmware_name);
1637         if (!ret) {
1638                 set_bit(QCA_IBS_ENABLED, &qca->flags);
1639                 qca_debugfs_init(hdev);
1640                 hu->hdev->hw_error = qca_hw_error;
1641                 hu->hdev->cmd_timeout = qca_cmd_timeout;
1642         } else if (ret == -ENOENT) {
1643                 /* No patch/nvm-config found, run with original fw/config */
1644                 ret = 0;
1645         } else if (ret == -EAGAIN) {
1646                 /*
1647                  * Userspace firmware loader will return -EAGAIN in case no
1648                  * patch/nvm-config is found, so run with original fw/config.
1649                  */
1650                 ret = 0;
1651         } else {
1652                 if (retries < MAX_INIT_RETRIES) {
1653                         qca_power_shutdown(hu);
1654                         if (hu->serdev) {
1655                                 serdev_device_close(hu->serdev);
1656                                 ret = serdev_device_open(hu->serdev);
1657                                 if (ret) {
1658                                         bt_dev_err(hdev, "failed to open port");
1659                                         return ret;
1660                                 }
1661                         }
1662                         retries++;
1663                         goto retry;
1664                 }
1665         }
1666
1667         /* Setup bdaddr */
1668         if (qca_is_wcn399x(soc_type))
1669                 hu->hdev->set_bdaddr = qca_set_bdaddr;
1670         else
1671                 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1672
1673         return ret;
1674 }
1675
1676 static const struct hci_uart_proto qca_proto = {
1677         .id             = HCI_UART_QCA,
1678         .name           = "QCA",
1679         .manufacturer   = 29,
1680         .init_speed     = 115200,
1681         .oper_speed     = 3000000,
1682         .open           = qca_open,
1683         .close          = qca_close,
1684         .flush          = qca_flush,
1685         .setup          = qca_setup,
1686         .recv           = qca_recv,
1687         .enqueue        = qca_enqueue,
1688         .dequeue        = qca_dequeue,
1689 };
1690
1691 static const struct qca_vreg_data qca_soc_data_wcn3990 = {
1692         .soc_type = QCA_WCN3990,
1693         .vregs = (struct qca_vreg []) {
1694                 { "vddio", 15000  },
1695                 { "vddxo", 80000  },
1696                 { "vddrf", 300000 },
1697                 { "vddch0", 450000 },
1698         },
1699         .num_vregs = 4,
1700 };
1701
1702 static const struct qca_vreg_data qca_soc_data_wcn3991 = {
1703         .soc_type = QCA_WCN3991,
1704         .vregs = (struct qca_vreg []) {
1705                 { "vddio", 15000  },
1706                 { "vddxo", 80000  },
1707                 { "vddrf", 300000 },
1708                 { "vddch0", 450000 },
1709         },
1710         .num_vregs = 4,
1711 };
1712
1713 static const struct qca_vreg_data qca_soc_data_wcn3998 = {
1714         .soc_type = QCA_WCN3998,
1715         .vregs = (struct qca_vreg []) {
1716                 { "vddio", 10000  },
1717                 { "vddxo", 80000  },
1718                 { "vddrf", 300000 },
1719                 { "vddch0", 450000 },
1720         },
1721         .num_vregs = 4,
1722 };
1723
1724 static void qca_power_shutdown(struct hci_uart *hu)
1725 {
1726         struct qca_serdev *qcadev;
1727         struct qca_data *qca = hu->priv;
1728         unsigned long flags;
1729         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1730
1731         qcadev = serdev_device_get_drvdata(hu->serdev);
1732
1733         /* From this point we go into power off state. But serial port is
1734          * still open, stop queueing the IBS data and flush all the buffered
1735          * data in skb's.
1736          */
1737         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1738         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1739         qca_flush(hu);
1740         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1741
1742         hu->hdev->hw_error = NULL;
1743         hu->hdev->cmd_timeout = NULL;
1744
1745         /* Non-serdev device usually is powered by external power
1746          * and don't need additional action in driver for power down
1747          */
1748         if (!hu->serdev)
1749                 return;
1750
1751         if (qca_is_wcn399x(soc_type)) {
1752                 host_set_baudrate(hu, 2400);
1753                 qca_send_power_pulse(hu, false);
1754                 qca_regulator_disable(qcadev);
1755         } else if (qcadev->bt_en) {
1756                 gpiod_set_value_cansleep(qcadev->bt_en, 0);
1757         }
1758 }
1759
1760 static int qca_power_off(struct hci_dev *hdev)
1761 {
1762         struct hci_uart *hu = hci_get_drvdata(hdev);
1763         struct qca_data *qca = hu->priv;
1764         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1765
1766         /* Stop sending shutdown command if soc crashes. */
1767         if (qca_is_wcn399x(soc_type)
1768                 && qca->memdump_state == QCA_MEMDUMP_IDLE) {
1769                 qca_send_pre_shutdown_cmd(hdev);
1770                 usleep_range(8000, 10000);
1771         }
1772
1773         qca->memdump_state = QCA_MEMDUMP_IDLE;
1774         qca_power_shutdown(hu);
1775         return 0;
1776 }
1777
1778 static int qca_regulator_enable(struct qca_serdev *qcadev)
1779 {
1780         struct qca_power *power = qcadev->bt_power;
1781         int ret;
1782
1783         /* Already enabled */
1784         if (power->vregs_on)
1785                 return 0;
1786
1787         BT_DBG("enabling %d regulators)", power->num_vregs);
1788
1789         ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
1790         if (ret)
1791                 return ret;
1792
1793         power->vregs_on = true;
1794
1795         ret = clk_prepare_enable(qcadev->susclk);
1796         if (ret)
1797                 qca_regulator_disable(qcadev);
1798
1799         return ret;
1800 }
1801
1802 static void qca_regulator_disable(struct qca_serdev *qcadev)
1803 {
1804         struct qca_power *power;
1805
1806         if (!qcadev)
1807                 return;
1808
1809         power = qcadev->bt_power;
1810
1811         /* Already disabled? */
1812         if (!power->vregs_on)
1813                 return;
1814
1815         regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
1816         power->vregs_on = false;
1817
1818         clk_disable_unprepare(qcadev->susclk);
1819 }
1820
1821 static int qca_init_regulators(struct qca_power *qca,
1822                                 const struct qca_vreg *vregs, size_t num_vregs)
1823 {
1824         struct regulator_bulk_data *bulk;
1825         int ret;
1826         int i;
1827
1828         bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
1829         if (!bulk)
1830                 return -ENOMEM;
1831
1832         for (i = 0; i < num_vregs; i++)
1833                 bulk[i].supply = vregs[i].name;
1834
1835         ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
1836         if (ret < 0)
1837                 return ret;
1838
1839         for (i = 0; i < num_vregs; i++) {
1840                 ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
1841                 if (ret)
1842                         return ret;
1843         }
1844
1845         qca->vreg_bulk = bulk;
1846         qca->num_vregs = num_vregs;
1847
1848         return 0;
1849 }
1850
1851 static int qca_serdev_probe(struct serdev_device *serdev)
1852 {
1853         struct qca_serdev *qcadev;
1854         struct hci_dev *hdev;
1855         const struct qca_vreg_data *data;
1856         int err;
1857         bool power_ctrl_enabled = true;
1858
1859         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1860         if (!qcadev)
1861                 return -ENOMEM;
1862
1863         qcadev->serdev_hu.serdev = serdev;
1864         data = device_get_match_data(&serdev->dev);
1865         serdev_device_set_drvdata(serdev, qcadev);
1866         device_property_read_string(&serdev->dev, "firmware-name",
1867                                          &qcadev->firmware_name);
1868         if (data && qca_is_wcn399x(data->soc_type)) {
1869                 qcadev->btsoc_type = data->soc_type;
1870                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1871                                                 sizeof(struct qca_power),
1872                                                 GFP_KERNEL);
1873                 if (!qcadev->bt_power)
1874                         return -ENOMEM;
1875
1876                 qcadev->bt_power->dev = &serdev->dev;
1877                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1878                                           data->num_vregs);
1879                 if (err) {
1880                         BT_ERR("Failed to init regulators:%d", err);
1881                         return err;
1882                 }
1883
1884                 qcadev->bt_power->vregs_on = false;
1885
1886                 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
1887                 if (IS_ERR(qcadev->susclk)) {
1888                         dev_err(&serdev->dev, "failed to acquire clk\n");
1889                         return PTR_ERR(qcadev->susclk);
1890                 }
1891
1892                 device_property_read_u32(&serdev->dev, "max-speed",
1893                                          &qcadev->oper_speed);
1894                 if (!qcadev->oper_speed)
1895                         BT_DBG("UART will pick default operating speed");
1896
1897                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1898                 if (err) {
1899                         BT_ERR("wcn3990 serdev registration failed");
1900                         return err;
1901                 }
1902         } else {
1903                 qcadev->btsoc_type = QCA_ROME;
1904                 qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
1905                                                GPIOD_OUT_LOW);
1906                 if (!qcadev->bt_en) {
1907                         dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
1908                         power_ctrl_enabled = false;
1909                 }
1910
1911                 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
1912                 if (!qcadev->susclk) {
1913                         dev_warn(&serdev->dev, "failed to acquire clk\n");
1914                 } else {
1915                         err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1916                         if (err)
1917                                 return err;
1918
1919                         err = clk_prepare_enable(qcadev->susclk);
1920                         if (err)
1921                                 return err;
1922                 }
1923
1924                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1925                 if (err) {
1926                         BT_ERR("Rome serdev registration failed");
1927                         if (qcadev->susclk)
1928                                 clk_disable_unprepare(qcadev->susclk);
1929                         return err;
1930                 }
1931         }
1932
1933         if (power_ctrl_enabled) {
1934                 hdev = qcadev->serdev_hu.hdev;
1935                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1936                 hdev->shutdown = qca_power_off;
1937         }
1938
1939         return 0;
1940 }
1941
1942 static void qca_serdev_remove(struct serdev_device *serdev)
1943 {
1944         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1945
1946         if (qca_is_wcn399x(qcadev->btsoc_type))
1947                 qca_power_shutdown(&qcadev->serdev_hu);
1948         else if (qcadev->susclk)
1949                 clk_disable_unprepare(qcadev->susclk);
1950
1951         hci_uart_unregister_device(&qcadev->serdev_hu);
1952 }
1953
1954 static int __maybe_unused qca_suspend(struct device *dev)
1955 {
1956         struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
1957         struct hci_uart *hu = hci_get_drvdata(hdev);
1958         struct qca_data *qca = hu->priv;
1959         unsigned long flags;
1960         int ret = 0;
1961         u8 cmd;
1962
1963         set_bit(QCA_SUSPENDING, &qca->flags);
1964
1965         /* Device is downloading patch or doesn't support in-band sleep. */
1966         if (!test_bit(QCA_IBS_ENABLED, &qca->flags))
1967                 return 0;
1968
1969         cancel_work_sync(&qca->ws_awake_device);
1970         cancel_work_sync(&qca->ws_awake_rx);
1971
1972         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
1973                                  flags, SINGLE_DEPTH_NESTING);
1974
1975         switch (qca->tx_ibs_state) {
1976         case HCI_IBS_TX_WAKING:
1977                 del_timer(&qca->wake_retrans_timer);
1978                 /* Fall through */
1979         case HCI_IBS_TX_AWAKE:
1980                 del_timer(&qca->tx_idle_timer);
1981
1982                 serdev_device_write_flush(hu->serdev);
1983                 cmd = HCI_IBS_SLEEP_IND;
1984                 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1985
1986                 if (ret < 0) {
1987                         BT_ERR("Failed to send SLEEP to device");
1988                         break;
1989                 }
1990
1991                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
1992                 qca->ibs_sent_slps++;
1993
1994                 qca_wq_serial_tx_clock_vote_off(&qca->ws_tx_vote_off);
1995                 break;
1996
1997         case HCI_IBS_TX_ASLEEP:
1998                 break;
1999
2000         default:
2001                 BT_ERR("Spurious tx state %d", qca->tx_ibs_state);
2002                 ret = -EINVAL;
2003                 break;
2004         }
2005
2006         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
2007
2008         if (ret < 0)
2009                 goto error;
2010
2011         serdev_device_wait_until_sent(hu->serdev,
2012                                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
2013
2014         /* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going
2015          * to sleep, so that the packet does not wake the system later.
2016          */
2017
2018         ret = wait_event_interruptible_timeout(qca->suspend_wait_q,
2019                         qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
2020                         msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
2021
2022         if (ret > 0)
2023                 return 0;
2024
2025         if (ret == 0)
2026                 ret = -ETIMEDOUT;
2027
2028 error:
2029         clear_bit(QCA_SUSPENDING, &qca->flags);
2030
2031         return ret;
2032 }
2033
2034 static int __maybe_unused qca_resume(struct device *dev)
2035 {
2036         struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
2037         struct hci_uart *hu = hci_get_drvdata(hdev);
2038         struct qca_data *qca = hu->priv;
2039
2040         clear_bit(QCA_SUSPENDING, &qca->flags);
2041
2042         return 0;
2043 }
2044
2045 static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume);
2046
2047 static const struct of_device_id qca_bluetooth_of_match[] = {
2048         { .compatible = "qcom,qca6174-bt" },
2049         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
2050         { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
2051         { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
2052         { /* sentinel */ }
2053 };
2054 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
2055
2056 static struct serdev_device_driver qca_serdev_driver = {
2057         .probe = qca_serdev_probe,
2058         .remove = qca_serdev_remove,
2059         .driver = {
2060                 .name = "hci_uart_qca",
2061                 .of_match_table = qca_bluetooth_of_match,
2062                 .pm = &qca_pm_ops,
2063         },
2064 };
2065
2066 int __init qca_init(void)
2067 {
2068         serdev_device_driver_register(&qca_serdev_driver);
2069
2070         return hci_uart_register_proto(&qca_proto);
2071 }
2072
2073 int __exit qca_deinit(void)
2074 {
2075         serdev_device_driver_unregister(&qca_serdev_driver);
2076
2077         return hci_uart_unregister_proto(&qca_proto);
2078 }