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_TX_IDLE_TIMEOUT_MS          2000
  47 #define CMD_TRANS_TIMEOUT_MS            100
  48
  49 /* susclk rate */
  50 #define SUSCLK_RATE_32KHZ       32768
  51
  52 /* Controller debug log header */
  53 #define QCA_DEBUG_HANDLE        0x2EDC
  54
  55 enum qca_flags {
  56         QCA_IBS_ENABLED,
  57         QCA_DROP_VENDOR_EVENT,
  58 };
  59
  60 /* HCI_IBS transmit side sleep protocol states */
  61 enum tx_ibs_states {
  62         HCI_IBS_TX_ASLEEP,
  63         HCI_IBS_TX_WAKING,
  64         HCI_IBS_TX_AWAKE,
  65 };
  66
  67 /* HCI_IBS receive side sleep protocol states */
  68 enum rx_states {
  69         HCI_IBS_RX_ASLEEP,
  70         HCI_IBS_RX_AWAKE,
  71 };
  72
  73 /* HCI_IBS transmit and receive side clock state vote */
  74 enum hci_ibs_clock_state_vote {
  75         HCI_IBS_VOTE_STATS_UPDATE,
  76         HCI_IBS_TX_VOTE_CLOCK_ON,
  77         HCI_IBS_TX_VOTE_CLOCK_OFF,
  78         HCI_IBS_RX_VOTE_CLOCK_ON,
  79         HCI_IBS_RX_VOTE_CLOCK_OFF,
  80 };
  81
  82 struct qca_data {
  83         struct hci_uart *hu;
  84         struct sk_buff *rx_skb;
  85         struct sk_buff_head txq;
  86         struct sk_buff_head tx_wait_q;  /* HCI_IBS wait queue   */
  87         spinlock_t hci_ibs_lock;        /* HCI_IBS state lock   */
  88         u8 tx_ibs_state;        /* HCI_IBS transmit side power state*/
  89         u8 rx_ibs_state;        /* HCI_IBS receive side power state */
  90         bool tx_vote;           /* Clock must be on for TX */
  91         bool rx_vote;           /* Clock must be on for RX */
  92         struct timer_list tx_idle_timer;
  93         u32 tx_idle_delay;
  94         struct timer_list wake_retrans_timer;
  95         u32 wake_retrans;
  96         struct workqueue_struct *workqueue;
  97         struct work_struct ws_awake_rx;
  98         struct work_struct ws_awake_device;
  99         struct work_struct ws_rx_vote_off;
 100         struct work_struct ws_tx_vote_off;
 101         unsigned long flags;
 102         struct completion drop_ev_comp;
 103
 104         /* For debugging purpose */
 105         u64 ibs_sent_wacks;
 106         u64 ibs_sent_slps;
 107         u64 ibs_sent_wakes;
 108         u64 ibs_recv_wacks;
 109         u64 ibs_recv_slps;
 110         u64 ibs_recv_wakes;
 111         u64 vote_last_jif;
 112         u32 vote_on_ms;
 113         u32 vote_off_ms;
 114         u64 tx_votes_on;
 115         u64 rx_votes_on;
 116         u64 tx_votes_off;
 117         u64 rx_votes_off;
 118         u64 votes_on;
 119         u64 votes_off;
 120 };
 121
 122 enum qca_speed_type {
 123         QCA_INIT_SPEED = 1,
 124         QCA_OPER_SPEED
 125 };
 126
 127 /*
 128  * Voltage regulator information required for configuring the
 129  * QCA Bluetooth chipset
 130  */
 131 struct qca_vreg {
 132         const char *name;
 133         unsigned int min_uV;
 134         unsigned int max_uV;
 135         unsigned int load_uA;
 136 };
 137
 138 struct qca_vreg_data {
 139         enum qca_btsoc_type soc_type;
 140         struct qca_vreg *vregs;
 141         size_t num_vregs;
 142 };
 143
 144 /*
 145  * Platform data for the QCA Bluetooth power driver.
 146  */
 147 struct qca_power {
 148         struct device *dev;
 149         const struct qca_vreg_data *vreg_data;
 150         struct regulator_bulk_data *vreg_bulk;
 151         bool vregs_on;
 152 };
 153
 154 struct qca_serdev {
 155         struct hci_uart  serdev_hu;
 156         struct gpio_desc *bt_en;
 157         struct clk       *susclk;
 158         enum qca_btsoc_type btsoc_type;
 159         struct qca_power *bt_power;
 160         u32 init_speed;
 161         u32 oper_speed;
 162         const char *firmware_name;
 163 };
 164
 165 static int qca_power_setup(struct hci_uart *hu, bool on);
 166 static void qca_power_shutdown(struct hci_uart *hu);
 167 static int qca_power_off(struct hci_dev *hdev);
 168
 169 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
 170 {
 171         enum qca_btsoc_type soc_type;
 172
 173         if (hu->serdev) {
 174                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 175
 176                 soc_type = qsd->btsoc_type;
 177         } else {
 178                 soc_type = QCA_ROME;
 179         }
 180
 181         return soc_type;
 182 }
 183
 184 static const char *qca_get_firmware_name(struct hci_uart *hu)
 185 {
 186         if (hu->serdev) {
 187                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 188
 189                 return qsd->firmware_name;
 190         } else {
 191                 return NULL;
 192         }
 193 }
 194
 195 static void __serial_clock_on(struct tty_struct *tty)
 196 {
 197         /* TODO: Some chipset requires to enable UART clock on client
 198          * side to save power consumption or manual work is required.
 199          * Please put your code to control UART clock here if needed
 200          */
 201 }
 202
 203 static void __serial_clock_off(struct tty_struct *tty)
 204 {
 205         /* TODO: Some chipset requires to disable UART clock on client
 206          * side to save power consumption or manual work is required.
 207          * Please put your code to control UART clock off here if needed
 208          */
 209 }
 210
 211 /* serial_clock_vote needs to be called with the ibs lock held */
 212 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
 213 {
 214         struct qca_data *qca = hu->priv;
 215         unsigned int diff;
 216
 217         bool old_vote = (qca->tx_vote | qca->rx_vote);
 218         bool new_vote;
 219
 220         switch (vote) {
 221         case HCI_IBS_VOTE_STATS_UPDATE:
 222                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 223
 224                 if (old_vote)
 225                         qca->vote_off_ms += diff;
 226                 else
 227                         qca->vote_on_ms += diff;
 228                 return;
 229
 230         case HCI_IBS_TX_VOTE_CLOCK_ON:
 231                 qca->tx_vote = true;
 232                 qca->tx_votes_on++;
 233                 new_vote = true;
 234                 break;
 235
 236         case HCI_IBS_RX_VOTE_CLOCK_ON:
 237                 qca->rx_vote = true;
 238                 qca->rx_votes_on++;
 239                 new_vote = true;
 240                 break;
 241
 242         case HCI_IBS_TX_VOTE_CLOCK_OFF:
 243                 qca->tx_vote = false;
 244                 qca->tx_votes_off++;
 245                 new_vote = qca->rx_vote | qca->tx_vote;
 246                 break;
 247
 248         case HCI_IBS_RX_VOTE_CLOCK_OFF:
 249                 qca->rx_vote = false;
 250                 qca->rx_votes_off++;
 251                 new_vote = qca->rx_vote | qca->tx_vote;
 252                 break;
 253
 254         default:
 255                 BT_ERR("Voting irregularity");
 256                 return;
 257         }
 258
 259         if (new_vote != old_vote) {
 260                 if (new_vote)
 261                         __serial_clock_on(hu->tty);
 262                 else
 263                         __serial_clock_off(hu->tty);
 264
 265                 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
 266                        vote ? "true" : "false");
 267
 268                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 269
 270                 if (new_vote) {
 271                         qca->votes_on++;
 272                         qca->vote_off_ms += diff;
 273                 } else {
 274                         qca->votes_off++;
 275                         qca->vote_on_ms += diff;
 276                 }
 277                 qca->vote_last_jif = jiffies;
 278         }
 279 }
 280
 281 /* Builds and sends an HCI_IBS command packet.
 282  * These are very simple packets with only 1 cmd byte.
 283  */
 284 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
 285 {
 286         int err = 0;
 287         struct sk_buff *skb = NULL;
 288         struct qca_data *qca = hu->priv;
 289
 290         BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
 291
 292         skb = bt_skb_alloc(1, GFP_ATOMIC);
 293         if (!skb) {
 294                 BT_ERR("Failed to allocate memory for HCI_IBS packet");
 295                 return -ENOMEM;
 296         }
 297
 298         /* Assign HCI_IBS type */
 299         skb_put_u8(skb, cmd);
 300
 301         skb_queue_tail(&qca->txq, skb);
 302
 303         return err;
 304 }
 305
 306 static void qca_wq_awake_device(struct work_struct *work)
 307 {
 308         struct qca_data *qca = container_of(work, struct qca_data,
 309                                             ws_awake_device);
 310         struct hci_uart *hu = qca->hu;
 311         unsigned long retrans_delay;
 312         unsigned long flags;
 313
 314         BT_DBG("hu %p wq awake device", hu);
 315
 316         /* Vote for serial clock */
 317         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
 318
 319         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 320
 321         /* Send wake indication to device */
 322         if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
 323                 BT_ERR("Failed to send WAKE to device");
 324
 325         qca->ibs_sent_wakes++;
 326
 327         /* Start retransmit timer */
 328         retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 329         mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 330
 331         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 332
 333         /* Actually send the packets */
 334         hci_uart_tx_wakeup(hu);
 335 }
 336
 337 static void qca_wq_awake_rx(struct work_struct *work)
 338 {
 339         struct qca_data *qca = container_of(work, struct qca_data,
 340                                             ws_awake_rx);
 341         struct hci_uart *hu = qca->hu;
 342         unsigned long flags;
 343
 344         BT_DBG("hu %p wq awake rx", hu);
 345
 346         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
 347
 348         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 349         qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
 350
 351         /* Always acknowledge device wake up,
 352          * sending IBS message doesn't count as TX ON.
 353          */
 354         if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
 355                 BT_ERR("Failed to acknowledge device wake up");
 356
 357         qca->ibs_sent_wacks++;
 358
 359         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 360
 361         /* Actually send the packets */
 362         hci_uart_tx_wakeup(hu);
 363 }
 364
 365 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
 366 {
 367         struct qca_data *qca = container_of(work, struct qca_data,
 368                                             ws_rx_vote_off);
 369         struct hci_uart *hu = qca->hu;
 370
 371         BT_DBG("hu %p rx clock vote off", hu);
 372
 373         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
 374 }
 375
 376 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
 377 {
 378         struct qca_data *qca = container_of(work, struct qca_data,
 379                                             ws_tx_vote_off);
 380         struct hci_uart *hu = qca->hu;
 381
 382         BT_DBG("hu %p tx clock vote off", hu);
 383
 384         /* Run HCI tx handling unlocked */
 385         hci_uart_tx_wakeup(hu);
 386
 387         /* Now that message queued to tty driver, vote for tty clocks off.
 388          * It is up to the tty driver to pend the clocks off until tx done.
 389          */
 390         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
 391 }
 392
 393 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 394 {
 395         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 396         struct hci_uart *hu = qca->hu;
 397         unsigned long flags;
 398
 399         BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
 400
 401         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 402                                  flags, SINGLE_DEPTH_NESTING);
 403
 404         switch (qca->tx_ibs_state) {
 405         case HCI_IBS_TX_AWAKE:
 406                 /* TX_IDLE, go to SLEEP */
 407                 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
 408                         BT_ERR("Failed to send SLEEP to device");
 409                         break;
 410                 }
 411                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 412                 qca->ibs_sent_slps++;
 413                 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
 414                 break;
 415
 416         case HCI_IBS_TX_ASLEEP:
 417         case HCI_IBS_TX_WAKING:
 418                 /* Fall through */
 419
 420         default:
 421                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 422                 break;
 423         }
 424
 425         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 426 }
 427
 428 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 429 {
 430         struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
 431         struct hci_uart *hu = qca->hu;
 432         unsigned long flags, retrans_delay;
 433         bool retransmit = false;
 434
 435         BT_DBG("hu %p wake retransmit timeout in %d state",
 436                 hu, qca->tx_ibs_state);
 437
 438         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 439                                  flags, SINGLE_DEPTH_NESTING);
 440
 441         switch (qca->tx_ibs_state) {
 442         case HCI_IBS_TX_WAKING:
 443                 /* No WAKE_ACK, retransmit WAKE */
 444                 retransmit = true;
 445                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
 446                         BT_ERR("Failed to acknowledge device wake up");
 447                         break;
 448                 }
 449                 qca->ibs_sent_wakes++;
 450                 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 451                 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 452                 break;
 453
 454         case HCI_IBS_TX_ASLEEP:
 455         case HCI_IBS_TX_AWAKE:
 456                 /* Fall through */
 457
 458         default:
 459                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 460                 break;
 461         }
 462
 463         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 464
 465         if (retransmit)
 466                 hci_uart_tx_wakeup(hu);
 467 }
 468
 469 /* Initialize protocol */
 470 static int qca_open(struct hci_uart *hu)
 471 {
 472         struct qca_serdev *qcadev;
 473         struct qca_data *qca;
 474         int ret;
 475
 476         BT_DBG("hu %p qca_open", hu);
 477
 478         if (!hci_uart_has_flow_control(hu))
 479                 return -EOPNOTSUPP;
 480
 481         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 482         if (!qca)
 483                 return -ENOMEM;
 484
 485         skb_queue_head_init(&qca->txq);
 486         skb_queue_head_init(&qca->tx_wait_q);
 487         spin_lock_init(&qca->hci_ibs_lock);
 488         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 489         if (!qca->workqueue) {
 490                 BT_ERR("QCA Workqueue not initialized properly");
 491                 kfree(qca);
 492                 return -ENOMEM;
 493         }
 494
 495         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 496         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 497         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 498         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 499
 500         qca->hu = hu;
 501         init_completion(&qca->drop_ev_comp);
 502
 503         /* Assume we start with both sides asleep -- extra wakes OK */
 504         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 505         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 506
 507         /* clocks actually on, but we start votes off */
 508         qca->tx_vote = false;
 509         qca->rx_vote = false;
 510         qca->flags = 0;
 511
 512         qca->ibs_sent_wacks = 0;
 513         qca->ibs_sent_slps = 0;
 514         qca->ibs_sent_wakes = 0;
 515         qca->ibs_recv_wacks = 0;
 516         qca->ibs_recv_slps = 0;
 517         qca->ibs_recv_wakes = 0;
 518         qca->vote_last_jif = jiffies;
 519         qca->vote_on_ms = 0;
 520         qca->vote_off_ms = 0;
 521         qca->votes_on = 0;
 522         qca->votes_off = 0;
 523         qca->tx_votes_on = 0;
 524         qca->tx_votes_off = 0;
 525         qca->rx_votes_on = 0;
 526         qca->rx_votes_off = 0;
 527
 528         hu->priv = qca;
 529
 530         if (hu->serdev) {
 531
 532                 qcadev = serdev_device_get_drvdata(hu->serdev);
 533                 if (!qca_is_wcn399x(qcadev->btsoc_type)) {
 534                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
 535                         /* Controller needs time to bootup. */
 536                         msleep(150);
 537                 } else {
 538                         hu->init_speed = qcadev->init_speed;
 539                         hu->oper_speed = qcadev->oper_speed;
 540                         ret = qca_power_setup(hu, true);
 541                         if (ret) {
 542                                 destroy_workqueue(qca->workqueue);
 543                                 kfree_skb(qca->rx_skb);
 544                                 hu->priv = NULL;
 545                                 kfree(qca);
 546                                 return ret;
 547                         }
 548                 }
 549         }
 550
 551         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 552         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 553
 554         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 555         qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
 556
 557         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 558                qca->tx_idle_delay, qca->wake_retrans);
 559
 560         return 0;
 561 }
 562
 563 static void qca_debugfs_init(struct hci_dev *hdev)
 564 {
 565         struct hci_uart *hu = hci_get_drvdata(hdev);
 566         struct qca_data *qca = hu->priv;
 567         struct dentry *ibs_dir;
 568         umode_t mode;
 569
 570         if (!hdev->debugfs)
 571                 return;
 572
 573         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 574
 575         /* read only */
 576         mode = S_IRUGO;
 577         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 578         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 579         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 580                            &qca->ibs_sent_slps);
 581         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 582                            &qca->ibs_sent_wakes);
 583         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 584                            &qca->ibs_sent_wacks);
 585         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 586                            &qca->ibs_recv_slps);
 587         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 588                            &qca->ibs_recv_wakes);
 589         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 590                            &qca->ibs_recv_wacks);
 591         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 592         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 593         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 594         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 595         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 596         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 597         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 598         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 599         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 600         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 601
 602         /* read/write */
 603         mode = S_IRUGO | S_IWUSR;
 604         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 605         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 606                            &qca->tx_idle_delay);
 607 }
 608
 609 /* Flush protocol data */
 610 static int qca_flush(struct hci_uart *hu)
 611 {
 612         struct qca_data *qca = hu->priv;
 613
 614         BT_DBG("hu %p qca flush", hu);
 615
 616         skb_queue_purge(&qca->tx_wait_q);
 617         skb_queue_purge(&qca->txq);
 618
 619         return 0;
 620 }
 621
 622 /* Close protocol */
 623 static int qca_close(struct hci_uart *hu)
 624 {
 625         struct qca_serdev *qcadev;
 626         struct qca_data *qca = hu->priv;
 627
 628         BT_DBG("hu %p qca close", hu);
 629
 630         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 631
 632         skb_queue_purge(&qca->tx_wait_q);
 633         skb_queue_purge(&qca->txq);
 634         del_timer(&qca->tx_idle_timer);
 635         del_timer(&qca->wake_retrans_timer);
 636         destroy_workqueue(qca->workqueue);
 637         qca->hu = NULL;
 638
 639         if (hu->serdev) {
 640                 qcadev = serdev_device_get_drvdata(hu->serdev);
 641                 if (qca_is_wcn399x(qcadev->btsoc_type))
 642                         qca_power_shutdown(hu);
 643                 else
 644                         gpiod_set_value_cansleep(qcadev->bt_en, 0);
 645
 646         }
 647
 648         kfree_skb(qca->rx_skb);
 649
 650         hu->priv = NULL;
 651
 652         kfree(qca);
 653
 654         return 0;
 655 }
 656
 657 /* Called upon a wake-up-indication from the device.
 658  */
 659 static void device_want_to_wakeup(struct hci_uart *hu)
 660 {
 661         unsigned long flags;
 662         struct qca_data *qca = hu->priv;
 663
 664         BT_DBG("hu %p want to wake up", hu);
 665
 666         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 667
 668         qca->ibs_recv_wakes++;
 669
 670         switch (qca->rx_ibs_state) {
 671         case HCI_IBS_RX_ASLEEP:
 672                 /* Make sure clock is on - we may have turned clock off since
 673                  * receiving the wake up indicator awake rx clock.
 674                  */
 675                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 676                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 677                 return;
 678
 679         case HCI_IBS_RX_AWAKE:
 680                 /* Always acknowledge device wake up,
 681                  * sending IBS message doesn't count as TX ON.
 682                  */
 683                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 684                         BT_ERR("Failed to acknowledge device wake up");
 685                         break;
 686                 }
 687                 qca->ibs_sent_wacks++;
 688                 break;
 689
 690         default:
 691                 /* Any other state is illegal */
 692                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 693                        qca->rx_ibs_state);
 694                 break;
 695         }
 696
 697         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 698
 699         /* Actually send the packets */
 700         hci_uart_tx_wakeup(hu);
 701 }
 702
 703 /* Called upon a sleep-indication from the device.
 704  */
 705 static void device_want_to_sleep(struct hci_uart *hu)
 706 {
 707         unsigned long flags;
 708         struct qca_data *qca = hu->priv;
 709
 710         BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);
 711
 712         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 713
 714         qca->ibs_recv_slps++;
 715
 716         switch (qca->rx_ibs_state) {
 717         case HCI_IBS_RX_AWAKE:
 718                 /* Update state */
 719                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 720                 /* Vote off rx clock under workqueue */
 721                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 722                 break;
 723
 724         case HCI_IBS_RX_ASLEEP:
 725                 break;
 726
 727         default:
 728                 /* Any other state is illegal */
 729                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 730                        qca->rx_ibs_state);
 731                 break;
 732         }
 733
 734         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 735 }
 736
 737 /* Called upon wake-up-acknowledgement from the device
 738  */
 739 static void device_woke_up(struct hci_uart *hu)
 740 {
 741         unsigned long flags, idle_delay;
 742         struct qca_data *qca = hu->priv;
 743         struct sk_buff *skb = NULL;
 744
 745         BT_DBG("hu %p woke up", hu);
 746
 747         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 748
 749         qca->ibs_recv_wacks++;
 750
 751         switch (qca->tx_ibs_state) {
 752         case HCI_IBS_TX_AWAKE:
 753                 /* Expect one if we send 2 WAKEs */
 754                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 755                        qca->tx_ibs_state);
 756                 break;
 757
 758         case HCI_IBS_TX_WAKING:
 759                 /* Send pending packets */
 760                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 761                         skb_queue_tail(&qca->txq, skb);
 762
 763                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 764                 del_timer(&qca->wake_retrans_timer);
 765                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 766                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 767                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 768                 break;
 769
 770         case HCI_IBS_TX_ASLEEP:
 771                 /* Fall through */
 772
 773         default:
 774                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 775                        qca->tx_ibs_state);
 776                 break;
 777         }
 778
 779         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 780
 781         /* Actually send the packets */
 782         hci_uart_tx_wakeup(hu);
 783 }
 784
 785 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 786  * two simultaneous tasklets.
 787  */
 788 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 789 {
 790         unsigned long flags = 0, idle_delay;
 791         struct qca_data *qca = hu->priv;
 792
 793         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 794                qca->tx_ibs_state);
 795
 796         /* Prepend skb with frame type */
 797         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 798
 799         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 800
 801         /* Don't go to sleep in middle of patch download or
 802          * Out-Of-Band(GPIOs control) sleep is selected.
 803          */
 804         if (!test_bit(QCA_IBS_ENABLED, &qca->flags)) {
 805                 skb_queue_tail(&qca->txq, skb);
 806                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 807                 return 0;
 808         }
 809
 810         /* Act according to current state */
 811         switch (qca->tx_ibs_state) {
 812         case HCI_IBS_TX_AWAKE:
 813                 BT_DBG("Device awake, sending normally");
 814                 skb_queue_tail(&qca->txq, skb);
 815                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 816                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 817                 break;
 818
 819         case HCI_IBS_TX_ASLEEP:
 820                 BT_DBG("Device asleep, waking up and queueing packet");
 821                 /* Save packet for later */
 822                 skb_queue_tail(&qca->tx_wait_q, skb);
 823
 824                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 825                 /* Schedule a work queue to wake up device */
 826                 queue_work(qca->workqueue, &qca->ws_awake_device);
 827                 break;
 828
 829         case HCI_IBS_TX_WAKING:
 830                 BT_DBG("Device waking up, queueing packet");
 831                 /* Transient state; just keep packet for later */
 832                 skb_queue_tail(&qca->tx_wait_q, skb);
 833                 break;
 834
 835         default:
 836                 BT_ERR("Illegal tx state: %d (losing packet)",
 837                        qca->tx_ibs_state);
 838                 kfree_skb(skb);
 839                 break;
 840         }
 841
 842         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 843
 844         return 0;
 845 }
 846
 847 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 848 {
 849         struct hci_uart *hu = hci_get_drvdata(hdev);
 850
 851         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 852
 853         device_want_to_sleep(hu);
 854
 855         kfree_skb(skb);
 856         return 0;
 857 }
 858
 859 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 860 {
 861         struct hci_uart *hu = hci_get_drvdata(hdev);
 862
 863         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 864
 865         device_want_to_wakeup(hu);
 866
 867         kfree_skb(skb);
 868         return 0;
 869 }
 870
 871 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 872 {
 873         struct hci_uart *hu = hci_get_drvdata(hdev);
 874
 875         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 876
 877         device_woke_up(hu);
 878
 879         kfree_skb(skb);
 880         return 0;
 881 }
 882
 883 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 884 {
 885         /* We receive debug logs from chip as an ACL packets.
 886          * Instead of sending the data to ACL to decode the
 887          * received data, we are pushing them to the above layers
 888          * as a diagnostic packet.
 889          */
 890         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 891                 return hci_recv_diag(hdev, skb);
 892
 893         return hci_recv_frame(hdev, skb);
 894 }
 895
 896 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 897 {
 898         struct hci_uart *hu = hci_get_drvdata(hdev);
 899         struct qca_data *qca = hu->priv;
 900
 901         if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
 902                 struct hci_event_hdr *hdr = (void *)skb->data;
 903
 904                 /* For the WCN3990 the vendor command for a baudrate change
 905                  * isn't sent as synchronous HCI command, because the
 906                  * controller sends the corresponding vendor event with the
 907                  * new baudrate. The event is received and properly decoded
 908                  * after changing the baudrate of the host port. It needs to
 909                  * be dropped, otherwise it can be misinterpreted as
 910                  * response to a later firmware download command (also a
 911                  * vendor command).
 912                  */
 913
 914                 if (hdr->evt == HCI_EV_VENDOR)
 915                         complete(&qca->drop_ev_comp);
 916
 917                 kfree_skb(skb);
 918
 919                 return 0;
 920         }
 921
 922         return hci_recv_frame(hdev, skb);
 923 }
 924
 925 #define QCA_IBS_SLEEP_IND_EVENT \
 926         .type = HCI_IBS_SLEEP_IND, \
 927         .hlen = 0, \
 928         .loff = 0, \
 929         .lsize = 0, \
 930         .maxlen = HCI_MAX_IBS_SIZE
 931
 932 #define QCA_IBS_WAKE_IND_EVENT \
 933         .type = HCI_IBS_WAKE_IND, \
 934         .hlen = 0, \
 935         .loff = 0, \
 936         .lsize = 0, \
 937         .maxlen = HCI_MAX_IBS_SIZE
 938
 939 #define QCA_IBS_WAKE_ACK_EVENT \
 940         .type = HCI_IBS_WAKE_ACK, \
 941         .hlen = 0, \
 942         .loff = 0, \
 943         .lsize = 0, \
 944         .maxlen = HCI_MAX_IBS_SIZE
 945
 946 static const struct h4_recv_pkt qca_recv_pkts[] = {
 947         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
 948         { H4_RECV_SCO,             .recv = hci_recv_frame    },
 949         { H4_RECV_EVENT,           .recv = qca_recv_event    },
 950         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
 951         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
 952         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
 953 };
 954
 955 static int qca_recv(struct hci_uart *hu, const void *data, int count)
 956 {
 957         struct qca_data *qca = hu->priv;
 958
 959         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 960                 return -EUNATCH;
 961
 962         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
 963                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
 964         if (IS_ERR(qca->rx_skb)) {
 965                 int err = PTR_ERR(qca->rx_skb);
 966                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 967                 qca->rx_skb = NULL;
 968                 return err;
 969         }
 970
 971         return count;
 972 }
 973
 974 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
 975 {
 976         struct qca_data *qca = hu->priv;
 977
 978         return skb_dequeue(&qca->txq);
 979 }
 980
 981 static uint8_t qca_get_baudrate_value(int speed)
 982 {
 983         switch (speed) {
 984         case 9600:
 985                 return QCA_BAUDRATE_9600;
 986         case 19200:
 987                 return QCA_BAUDRATE_19200;
 988         case 38400:
 989                 return QCA_BAUDRATE_38400;
 990         case 57600:
 991                 return QCA_BAUDRATE_57600;
 992         case 115200:
 993                 return QCA_BAUDRATE_115200;
 994         case 230400:
 995                 return QCA_BAUDRATE_230400;
 996         case 460800:
 997                 return QCA_BAUDRATE_460800;
 998         case 500000:
 999                 return QCA_BAUDRATE_500000;
1000         case 921600:
1001                 return QCA_BAUDRATE_921600;
1002         case 1000000:
1003                 return QCA_BAUDRATE_1000000;
1004         case 2000000:
1005                 return QCA_BAUDRATE_2000000;
1006         case 3000000:
1007                 return QCA_BAUDRATE_3000000;
1008         case 3200000:
1009                 return QCA_BAUDRATE_3200000;
1010         case 3500000:
1011                 return QCA_BAUDRATE_3500000;
1012         default:
1013                 return QCA_BAUDRATE_115200;
1014         }
1015 }
1016
1017 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
1018 {
1019         struct hci_uart *hu = hci_get_drvdata(hdev);
1020         struct qca_data *qca = hu->priv;
1021         struct sk_buff *skb;
1022         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
1023
1024         if (baudrate > QCA_BAUDRATE_3200000)
1025                 return -EINVAL;
1026
1027         cmd[4] = baudrate;
1028
1029         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1030         if (!skb) {
1031                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
1032                 return -ENOMEM;
1033         }
1034
1035         /* Assign commands to change baudrate and packet type. */
1036         skb_put_data(skb, cmd, sizeof(cmd));
1037         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1038
1039         skb_queue_tail(&qca->txq, skb);
1040         hci_uart_tx_wakeup(hu);
1041
1042         /* Wait for the baudrate change request to be sent */
1043
1044         while (!skb_queue_empty(&qca->txq))
1045                 usleep_range(100, 200);
1046
1047         if (hu->serdev)
1048                 serdev_device_wait_until_sent(hu->serdev,
1049                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1050
1051         /* Give the controller time to process the request */
1052         if (qca_is_wcn399x(qca_soc_type(hu)))
1053                 msleep(10);
1054         else
1055                 msleep(300);
1056
1057         return 0;
1058 }
1059
1060 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1061 {
1062         if (hu->serdev)
1063                 serdev_device_set_baudrate(hu->serdev, speed);
1064         else
1065                 hci_uart_set_baudrate(hu, speed);
1066 }
1067
1068 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1069 {
1070         int ret;
1071         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1072         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1073
1074         /* These power pulses are single byte command which are sent
1075          * at required baudrate to wcn3990. On wcn3990, we have an external
1076          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1077          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1078          * and also we use the same power inputs to turn on and off for
1079          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1080          * we send a power on pulse at 115200 bps. This algorithm will help to
1081          * save power. Disabling hardware flow control is mandatory while
1082          * sending power pulses to SoC.
1083          */
1084         bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1085
1086         serdev_device_write_flush(hu->serdev);
1087         hci_uart_set_flow_control(hu, true);
1088         ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1089         if (ret < 0) {
1090                 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1091                 return ret;
1092         }
1093
1094         serdev_device_wait_until_sent(hu->serdev, timeout);
1095         hci_uart_set_flow_control(hu, false);
1096
1097         /* Give to controller time to boot/shutdown */
1098         if (on)
1099                 msleep(100);
1100         else
1101                 msleep(10);
1102
1103         return 0;
1104 }
1105
1106 static unsigned int qca_get_speed(struct hci_uart *hu,
1107                                   enum qca_speed_type speed_type)
1108 {
1109         unsigned int speed = 0;
1110
1111         if (speed_type == QCA_INIT_SPEED) {
1112                 if (hu->init_speed)
1113                         speed = hu->init_speed;
1114                 else if (hu->proto->init_speed)
1115                         speed = hu->proto->init_speed;
1116         } else {
1117                 if (hu->oper_speed)
1118                         speed = hu->oper_speed;
1119                 else if (hu->proto->oper_speed)
1120                         speed = hu->proto->oper_speed;
1121         }
1122
1123         return speed;
1124 }
1125
1126 static int qca_check_speeds(struct hci_uart *hu)
1127 {
1128         if (qca_is_wcn399x(qca_soc_type(hu))) {
1129                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1130                     !qca_get_speed(hu, QCA_OPER_SPEED))
1131                         return -EINVAL;
1132         } else {
1133                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1134                     !qca_get_speed(hu, QCA_OPER_SPEED))
1135                         return -EINVAL;
1136         }
1137
1138         return 0;
1139 }
1140
1141 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1142 {
1143         unsigned int speed, qca_baudrate;
1144         struct qca_data *qca = hu->priv;
1145         int ret = 0;
1146
1147         if (speed_type == QCA_INIT_SPEED) {
1148                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1149                 if (speed)
1150                         host_set_baudrate(hu, speed);
1151         } else {
1152                 enum qca_btsoc_type soc_type = qca_soc_type(hu);
1153
1154                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1155                 if (!speed)
1156                         return 0;
1157
1158                 /* Disable flow control for wcn3990 to deassert RTS while
1159                  * changing the baudrate of chip and host.
1160                  */
1161                 if (qca_is_wcn399x(soc_type))
1162                         hci_uart_set_flow_control(hu, true);
1163
1164                 if (soc_type == QCA_WCN3990) {
1165                         reinit_completion(&qca->drop_ev_comp);
1166                         set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1167                 }
1168
1169                 qca_baudrate = qca_get_baudrate_value(speed);
1170                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1171                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1172                 if (ret)
1173                         goto error;
1174
1175                 host_set_baudrate(hu, speed);
1176
1177 error:
1178                 if (qca_is_wcn399x(soc_type))
1179                         hci_uart_set_flow_control(hu, false);
1180
1181                 if (soc_type == QCA_WCN3990) {
1182                         /* Wait for the controller to send the vendor event
1183                          * for the baudrate change command.
1184                          */
1185                         if (!wait_for_completion_timeout(&qca->drop_ev_comp,
1186                                                  msecs_to_jiffies(100))) {
1187                                 bt_dev_err(hu->hdev,
1188                                            "Failed to change controller baudrate\n");
1189                                 ret = -ETIMEDOUT;
1190                         }
1191
1192                         clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1193                 }
1194         }
1195
1196         return ret;
1197 }
1198
1199 static int qca_wcn3990_init(struct hci_uart *hu)
1200 {
1201         struct qca_serdev *qcadev;
1202         int ret;
1203
1204         /* Check for vregs status, may be hci down has turned
1205          * off the voltage regulator.
1206          */
1207         qcadev = serdev_device_get_drvdata(hu->serdev);
1208         if (!qcadev->bt_power->vregs_on) {
1209                 serdev_device_close(hu->serdev);
1210                 ret = qca_power_setup(hu, true);
1211                 if (ret)
1212                         return ret;
1213
1214                 ret = serdev_device_open(hu->serdev);
1215                 if (ret) {
1216                         bt_dev_err(hu->hdev, "failed to open port");
1217                         return ret;
1218                 }
1219         }
1220
1221         /* Forcefully enable wcn3990 to enter in to boot mode. */
1222         host_set_baudrate(hu, 2400);
1223         ret = qca_send_power_pulse(hu, false);
1224         if (ret)
1225                 return ret;
1226
1227         qca_set_speed(hu, QCA_INIT_SPEED);
1228         ret = qca_send_power_pulse(hu, true);
1229         if (ret)
1230                 return ret;
1231
1232         /* Now the device is in ready state to communicate with host.
1233          * To sync host with device we need to reopen port.
1234          * Without this, we will have RTS and CTS synchronization
1235          * issues.
1236          */
1237         serdev_device_close(hu->serdev);
1238         ret = serdev_device_open(hu->serdev);
1239         if (ret) {
1240                 bt_dev_err(hu->hdev, "failed to open port");
1241                 return ret;
1242         }
1243
1244         hci_uart_set_flow_control(hu, false);
1245
1246         return 0;
1247 }
1248
1249 static int qca_setup(struct hci_uart *hu)
1250 {
1251         struct hci_dev *hdev = hu->hdev;
1252         struct qca_data *qca = hu->priv;
1253         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1254         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1255         const char *firmware_name = qca_get_firmware_name(hu);
1256         int ret;
1257         int soc_ver = 0;
1258
1259         ret = qca_check_speeds(hu);
1260         if (ret)
1261                 return ret;
1262
1263         /* Patch downloading has to be done without IBS mode */
1264         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1265
1266         if (qca_is_wcn399x(soc_type)) {
1267                 bt_dev_info(hdev, "setting up wcn3990");
1268
1269                 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute
1270                  * setup for every hci up.
1271                  */
1272                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1273                 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1274                 hu->hdev->shutdown = qca_power_off;
1275                 ret = qca_wcn3990_init(hu);
1276                 if (ret)
1277                         return ret;
1278
1279                 ret = qca_read_soc_version(hdev, &soc_ver);
1280                 if (ret)
1281                         return ret;
1282         } else {
1283                 bt_dev_info(hdev, "ROME setup");
1284                 qca_set_speed(hu, QCA_INIT_SPEED);
1285         }
1286
1287         /* Setup user speed if needed */
1288         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1289         if (speed) {
1290                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1291                 if (ret)
1292                         return ret;
1293
1294                 qca_baudrate = qca_get_baudrate_value(speed);
1295         }
1296
1297         if (!qca_is_wcn399x(soc_type)) {
1298                 /* Get QCA version information */
1299                 ret = qca_read_soc_version(hdev, &soc_ver);
1300                 if (ret)
1301                         return ret;
1302         }
1303
1304         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1305         /* Setup patch / NVM configurations */
1306         ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver,
1307                         firmware_name);
1308         if (!ret) {
1309                 set_bit(QCA_IBS_ENABLED, &qca->flags);
1310                 qca_debugfs_init(hdev);
1311         } else if (ret == -ENOENT) {
1312                 /* No patch/nvm-config found, run with original fw/config */
1313                 ret = 0;
1314         } else if (ret == -EAGAIN) {
1315                 /*
1316                  * Userspace firmware loader will return -EAGAIN in case no
1317                  * patch/nvm-config is found, so run with original fw/config.
1318                  */
1319                 ret = 0;
1320         }
1321
1322         /* Setup bdaddr */
1323         if (qca_is_wcn399x(soc_type))
1324                 hu->hdev->set_bdaddr = qca_set_bdaddr;
1325         else
1326                 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1327
1328         return ret;
1329 }
1330
1331 static struct hci_uart_proto qca_proto = {
1332         .id             = HCI_UART_QCA,
1333         .name           = "QCA",
1334         .manufacturer   = 29,
1335         .init_speed     = 115200,
1336         .oper_speed     = 3000000,
1337         .open           = qca_open,
1338         .close          = qca_close,
1339         .flush          = qca_flush,
1340         .setup          = qca_setup,
1341         .recv           = qca_recv,
1342         .enqueue        = qca_enqueue,
1343         .dequeue        = qca_dequeue,
1344 };
1345
1346 static const struct qca_vreg_data qca_soc_data_wcn3990 = {
1347         .soc_type = QCA_WCN3990,
1348         .vregs = (struct qca_vreg []) {
1349                 { "vddio",   1800000, 1900000,  15000  },
1350                 { "vddxo",   1800000, 1900000,  80000  },
1351                 { "vddrf",   1300000, 1350000,  300000 },
1352                 { "vddch0",  3300000, 3400000,  450000 },
1353         },
1354         .num_vregs = 4,
1355 };
1356
1357 static const struct qca_vreg_data qca_soc_data_wcn3998 = {
1358         .soc_type = QCA_WCN3998,
1359         .vregs = (struct qca_vreg []) {
1360                 { "vddio",   1800000, 1900000,  10000  },
1361                 { "vddxo",   1800000, 1900000,  80000  },
1362                 { "vddrf",   1300000, 1352000,  300000 },
1363                 { "vddch0",  3300000, 3300000,  450000 },
1364         },
1365         .num_vregs = 4,
1366 };
1367
1368 static void qca_power_shutdown(struct hci_uart *hu)
1369 {
1370         struct qca_data *qca = hu->priv;
1371         unsigned long flags;
1372
1373         /* From this point we go into power off state. But serial port is
1374          * still open, stop queueing the IBS data and flush all the buffered
1375          * data in skb's.
1376          */
1377         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1378         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1379         qca_flush(hu);
1380         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1381
1382         host_set_baudrate(hu, 2400);
1383         qca_send_power_pulse(hu, false);
1384         qca_power_setup(hu, false);
1385 }
1386
1387 static int qca_power_off(struct hci_dev *hdev)
1388 {
1389         struct hci_uart *hu = hci_get_drvdata(hdev);
1390
1391         /* Perform pre shutdown command */
1392         qca_send_pre_shutdown_cmd(hdev);
1393
1394         qca_power_shutdown(hu);
1395         return 0;
1396 }
1397
1398 static int qca_enable_regulator(struct qca_vreg vregs,
1399                                 struct regulator *regulator)
1400 {
1401         int ret;
1402
1403         ret = regulator_set_voltage(regulator, vregs.min_uV,
1404                                     vregs.max_uV);
1405         if (ret)
1406                 return ret;
1407
1408         if (vregs.load_uA)
1409                 ret = regulator_set_load(regulator,
1410                                          vregs.load_uA);
1411
1412         if (ret)
1413                 return ret;
1414
1415         return regulator_enable(regulator);
1416
1417 }
1418
1419 static void qca_disable_regulator(struct qca_vreg vregs,
1420                                   struct regulator *regulator)
1421 {
1422         regulator_disable(regulator);
1423         regulator_set_voltage(regulator, 0, vregs.max_uV);
1424         if (vregs.load_uA)
1425                 regulator_set_load(regulator, 0);
1426
1427 }
1428
1429 static int qca_power_setup(struct hci_uart *hu, bool on)
1430 {
1431         struct qca_vreg *vregs;
1432         struct regulator_bulk_data *vreg_bulk;
1433         struct qca_serdev *qcadev;
1434         int i, num_vregs, ret = 0;
1435
1436         qcadev = serdev_device_get_drvdata(hu->serdev);
1437         if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1438             !qcadev->bt_power->vreg_bulk)
1439                 return -EINVAL;
1440
1441         vregs = qcadev->bt_power->vreg_data->vregs;
1442         vreg_bulk = qcadev->bt_power->vreg_bulk;
1443         num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1444         BT_DBG("on: %d", on);
1445         if (on && !qcadev->bt_power->vregs_on) {
1446                 for (i = 0; i < num_vregs; i++) {
1447                         ret = qca_enable_regulator(vregs[i],
1448                                                    vreg_bulk[i].consumer);
1449                         if (ret)
1450                                 break;
1451                 }
1452
1453                 if (ret) {
1454                         BT_ERR("failed to enable regulator:%s", vregs[i].name);
1455                         /* turn off regulators which are enabled */
1456                         for (i = i - 1; i >= 0; i--)
1457                                 qca_disable_regulator(vregs[i],
1458                                                       vreg_bulk[i].consumer);
1459                 } else {
1460                         qcadev->bt_power->vregs_on = true;
1461                 }
1462         } else if (!on && qcadev->bt_power->vregs_on) {
1463                 /* turn off regulator in reverse order */
1464                 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1465                 for ( ; i >= 0; i--)
1466                         qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1467
1468                 qcadev->bt_power->vregs_on = false;
1469         }
1470
1471         return ret;
1472 }
1473
1474 static int qca_init_regulators(struct qca_power *qca,
1475                                 const struct qca_vreg *vregs, size_t num_vregs)
1476 {
1477         int i;
1478
1479         qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs,
1480                                       sizeof(struct regulator_bulk_data),
1481                                       GFP_KERNEL);
1482         if (!qca->vreg_bulk)
1483                 return -ENOMEM;
1484
1485         for (i = 0; i < num_vregs; i++)
1486                 qca->vreg_bulk[i].supply = vregs[i].name;
1487
1488         return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1489 }
1490
1491 static int qca_serdev_probe(struct serdev_device *serdev)
1492 {
1493         struct qca_serdev *qcadev;
1494         const struct qca_vreg_data *data;
1495         int err;
1496
1497         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1498         if (!qcadev)
1499                 return -ENOMEM;
1500
1501         qcadev->serdev_hu.serdev = serdev;
1502         data = of_device_get_match_data(&serdev->dev);
1503         serdev_device_set_drvdata(serdev, qcadev);
1504         device_property_read_string(&serdev->dev, "firmware-name",
1505                                          &qcadev->firmware_name);
1506         if (data && qca_is_wcn399x(data->soc_type)) {
1507                 qcadev->btsoc_type = data->soc_type;
1508                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1509                                                 sizeof(struct qca_power),
1510                                                 GFP_KERNEL);
1511                 if (!qcadev->bt_power)
1512                         return -ENOMEM;
1513
1514                 qcadev->bt_power->dev = &serdev->dev;
1515                 qcadev->bt_power->vreg_data = data;
1516                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1517                                           data->num_vregs);
1518                 if (err) {
1519                         BT_ERR("Failed to init regulators:%d", err);
1520                         goto out;
1521                 }
1522
1523                 qcadev->bt_power->vregs_on = false;
1524
1525                 device_property_read_u32(&serdev->dev, "max-speed",
1526                                          &qcadev->oper_speed);
1527                 if (!qcadev->oper_speed)
1528                         BT_DBG("UART will pick default operating speed");
1529
1530                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1531                 if (err) {
1532                         BT_ERR("wcn3990 serdev registration failed");
1533                         goto out;
1534                 }
1535         } else {
1536                 qcadev->btsoc_type = QCA_ROME;
1537                 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1538                                                GPIOD_OUT_LOW);
1539                 if (IS_ERR(qcadev->bt_en)) {
1540                         dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1541                         return PTR_ERR(qcadev->bt_en);
1542                 }
1543
1544                 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1545                 if (IS_ERR(qcadev->susclk)) {
1546                         dev_err(&serdev->dev, "failed to acquire clk\n");
1547                         return PTR_ERR(qcadev->susclk);
1548                 }
1549
1550                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1551                 if (err)
1552                         return err;
1553
1554                 err = clk_prepare_enable(qcadev->susclk);
1555                 if (err)
1556                         return err;
1557
1558                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1559                 if (err)
1560                         clk_disable_unprepare(qcadev->susclk);
1561         }
1562
1563 out:    return err;
1564
1565 }
1566
1567 static void qca_serdev_remove(struct serdev_device *serdev)
1568 {
1569         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1570
1571         if (qca_is_wcn399x(qcadev->btsoc_type))
1572                 qca_power_shutdown(&qcadev->serdev_hu);
1573         else
1574                 clk_disable_unprepare(qcadev->susclk);
1575
1576         hci_uart_unregister_device(&qcadev->serdev_hu);
1577 }
1578
1579 static const struct of_device_id qca_bluetooth_of_match[] = {
1580         { .compatible = "qcom,qca6174-bt" },
1581         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
1582         { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
1583         { /* sentinel */ }
1584 };
1585 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1586
1587 static struct serdev_device_driver qca_serdev_driver = {
1588         .probe = qca_serdev_probe,
1589         .remove = qca_serdev_remove,
1590         .driver = {
1591                 .name = "hci_uart_qca",
1592                 .of_match_table = qca_bluetooth_of_match,
1593         },
1594 };
1595
1596 int __init qca_init(void)
1597 {
1598         serdev_device_driver_register(&qca_serdev_driver);
1599
1600         return hci_uart_register_proto(&qca_proto);
1601 }
1602
1603 int __exit qca_deinit(void)
1604 {
1605         serdev_device_driver_unregister(&qca_serdev_driver);
1606
1607         return hci_uart_unregister_proto(&qca_proto);
1608 }