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