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