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/debugfs.h>
  21 #include <linux/delay.h>
  22 #include <linux/device.h>
  23 #include <linux/gpio/consumer.h>
  24 #include <linux/mod_devicetable.h>
  25 #include <linux/module.h>
  26 #include <linux/of_device.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/regulator/consumer.h>
  29 #include <linux/serdev.h>
  30 #include <asm/unaligned.h>
  31
  32 #include <net/bluetooth/bluetooth.h>
  33 #include <net/bluetooth/hci_core.h>
  34
  35 #include "hci_uart.h"
  36 #include "btqca.h"
  37
  38 /* HCI_IBS protocol messages */
  39 #define HCI_IBS_SLEEP_IND       0xFE
  40 #define HCI_IBS_WAKE_IND        0xFD
  41 #define HCI_IBS_WAKE_ACK        0xFC
  42 #define HCI_MAX_IBS_SIZE        10
  43
  44 #define IBS_WAKE_RETRANS_TIMEOUT_MS     100
  45 #define IBS_TX_IDLE_TIMEOUT_MS          2000
  46 #define CMD_TRANS_TIMEOUT_MS            100
  47
  48 /* susclk rate */
  49 #define SUSCLK_RATE_32KHZ       32768
  50
  51 /* Controller debug log header */
  52 #define QCA_DEBUG_HANDLE        0x2EDC
  53
  54 enum qca_flags {
  55         QCA_IBS_ENABLED,
  56 };
  57
  58 /* HCI_IBS transmit side sleep protocol states */
  59 enum tx_ibs_states {
  60         HCI_IBS_TX_ASLEEP,
  61         HCI_IBS_TX_WAKING,
  62         HCI_IBS_TX_AWAKE,
  63 };
  64
  65 /* HCI_IBS receive side sleep protocol states */
  66 enum rx_states {
  67         HCI_IBS_RX_ASLEEP,
  68         HCI_IBS_RX_AWAKE,
  69 };
  70
  71 /* HCI_IBS transmit and receive side clock state vote */
  72 enum hci_ibs_clock_state_vote {
  73         HCI_IBS_VOTE_STATS_UPDATE,
  74         HCI_IBS_TX_VOTE_CLOCK_ON,
  75         HCI_IBS_TX_VOTE_CLOCK_OFF,
  76         HCI_IBS_RX_VOTE_CLOCK_ON,
  77         HCI_IBS_RX_VOTE_CLOCK_OFF,
  78 };
  79
  80 struct qca_data {
  81         struct hci_uart *hu;
  82         struct sk_buff *rx_skb;
  83         struct sk_buff_head txq;
  84         struct sk_buff_head tx_wait_q;  /* HCI_IBS wait queue   */
  85         spinlock_t hci_ibs_lock;        /* HCI_IBS state lock   */
  86         u8 tx_ibs_state;        /* HCI_IBS transmit side power state*/
  87         u8 rx_ibs_state;        /* HCI_IBS receive side power state */
  88         bool tx_vote;           /* Clock must be on for TX */
  89         bool rx_vote;           /* Clock must be on for RX */
  90         struct timer_list tx_idle_timer;
  91         u32 tx_idle_delay;
  92         struct timer_list wake_retrans_timer;
  93         u32 wake_retrans;
  94         struct workqueue_struct *workqueue;
  95         struct work_struct ws_awake_rx;
  96         struct work_struct ws_awake_device;
  97         struct work_struct ws_rx_vote_off;
  98         struct work_struct ws_tx_vote_off;
  99         unsigned long flags;
 100
 101         /* For debugging purpose */
 102         u64 ibs_sent_wacks;
 103         u64 ibs_sent_slps;
 104         u64 ibs_sent_wakes;
 105         u64 ibs_recv_wacks;
 106         u64 ibs_recv_slps;
 107         u64 ibs_recv_wakes;
 108         u64 vote_last_jif;
 109         u32 vote_on_ms;
 110         u32 vote_off_ms;
 111         u64 tx_votes_on;
 112         u64 rx_votes_on;
 113         u64 tx_votes_off;
 114         u64 rx_votes_off;
 115         u64 votes_on;
 116         u64 votes_off;
 117 };
 118
 119 enum qca_speed_type {
 120         QCA_INIT_SPEED = 1,
 121         QCA_OPER_SPEED
 122 };
 123
 124 /*
 125  * Voltage regulator information required for configuring the
 126  * QCA Bluetooth chipset
 127  */
 128 struct qca_vreg {
 129         const char *name;
 130         unsigned int min_uV;
 131         unsigned int max_uV;
 132         unsigned int load_uA;
 133 };
 134
 135 struct qca_vreg_data {
 136         enum qca_btsoc_type soc_type;
 137         struct qca_vreg *vregs;
 138         size_t num_vregs;
 139 };
 140
 141 /*
 142  * Platform data for the QCA Bluetooth power driver.
 143  */
 144 struct qca_power {
 145         struct device *dev;
 146         const struct qca_vreg_data *vreg_data;
 147         struct regulator_bulk_data *vreg_bulk;
 148         bool vregs_on;
 149 };
 150
 151 struct qca_serdev {
 152         struct hci_uart  serdev_hu;
 153         struct gpio_desc *bt_en;
 154         struct clk       *susclk;
 155         enum qca_btsoc_type btsoc_type;
 156         struct qca_power *bt_power;
 157         u32 init_speed;
 158         u32 oper_speed;
 159 };
 160
 161 static int qca_power_setup(struct hci_uart *hu, bool on);
 162 static void qca_power_shutdown(struct hci_uart *hu);
 163 static int qca_power_off(struct hci_dev *hdev);
 164
 165 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
 166 {
 167         enum qca_btsoc_type soc_type;
 168
 169         if (hu->serdev) {
 170                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 171
 172                 soc_type = qsd->btsoc_type;
 173         } else {
 174                 soc_type = QCA_ROME;
 175         }
 176
 177         return soc_type;
 178 }
 179
 180 static void __serial_clock_on(struct tty_struct *tty)
 181 {
 182         /* TODO: Some chipset requires to enable UART clock on client
 183          * side to save power consumption or manual work is required.
 184          * Please put your code to control UART clock here if needed
 185          */
 186 }
 187
 188 static void __serial_clock_off(struct tty_struct *tty)
 189 {
 190         /* TODO: Some chipset requires to disable UART clock on client
 191          * side to save power consumption or manual work is required.
 192          * Please put your code to control UART clock off here if needed
 193          */
 194 }
 195
 196 /* serial_clock_vote needs to be called with the ibs lock held */
 197 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
 198 {
 199         struct qca_data *qca = hu->priv;
 200         unsigned int diff;
 201
 202         bool old_vote = (qca->tx_vote | qca->rx_vote);
 203         bool new_vote;
 204
 205         switch (vote) {
 206         case HCI_IBS_VOTE_STATS_UPDATE:
 207                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 208
 209                 if (old_vote)
 210                         qca->vote_off_ms += diff;
 211                 else
 212                         qca->vote_on_ms += diff;
 213                 return;
 214
 215         case HCI_IBS_TX_VOTE_CLOCK_ON:
 216                 qca->tx_vote = true;
 217                 qca->tx_votes_on++;
 218                 new_vote = true;
 219                 break;
 220
 221         case HCI_IBS_RX_VOTE_CLOCK_ON:
 222                 qca->rx_vote = true;
 223                 qca->rx_votes_on++;
 224                 new_vote = true;
 225                 break;
 226
 227         case HCI_IBS_TX_VOTE_CLOCK_OFF:
 228                 qca->tx_vote = false;
 229                 qca->tx_votes_off++;
 230                 new_vote = qca->rx_vote | qca->tx_vote;
 231                 break;
 232
 233         case HCI_IBS_RX_VOTE_CLOCK_OFF:
 234                 qca->rx_vote = false;
 235                 qca->rx_votes_off++;
 236                 new_vote = qca->rx_vote | qca->tx_vote;
 237                 break;
 238
 239         default:
 240                 BT_ERR("Voting irregularity");
 241                 return;
 242         }
 243
 244         if (new_vote != old_vote) {
 245                 if (new_vote)
 246                         __serial_clock_on(hu->tty);
 247                 else
 248                         __serial_clock_off(hu->tty);
 249
 250                 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
 251                        vote ? "true" : "false");
 252
 253                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 254
 255                 if (new_vote) {
 256                         qca->votes_on++;
 257                         qca->vote_off_ms += diff;
 258                 } else {
 259                         qca->votes_off++;
 260                         qca->vote_on_ms += diff;
 261                 }
 262                 qca->vote_last_jif = jiffies;
 263         }
 264 }
 265
 266 /* Builds and sends an HCI_IBS command packet.
 267  * These are very simple packets with only 1 cmd byte.
 268  */
 269 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
 270 {
 271         int err = 0;
 272         struct sk_buff *skb = NULL;
 273         struct qca_data *qca = hu->priv;
 274
 275         BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
 276
 277         skb = bt_skb_alloc(1, GFP_ATOMIC);
 278         if (!skb) {
 279                 BT_ERR("Failed to allocate memory for HCI_IBS packet");
 280                 return -ENOMEM;
 281         }
 282
 283         /* Assign HCI_IBS type */
 284         skb_put_u8(skb, cmd);
 285
 286         skb_queue_tail(&qca->txq, skb);
 287
 288         return err;
 289 }
 290
 291 static void qca_wq_awake_device(struct work_struct *work)
 292 {
 293         struct qca_data *qca = container_of(work, struct qca_data,
 294                                             ws_awake_device);
 295         struct hci_uart *hu = qca->hu;
 296         unsigned long retrans_delay;
 297
 298         BT_DBG("hu %p wq awake device", hu);
 299
 300         /* Vote for serial clock */
 301         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
 302
 303         spin_lock(&qca->hci_ibs_lock);
 304
 305         /* Send wake indication to device */
 306         if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
 307                 BT_ERR("Failed to send WAKE to device");
 308
 309         qca->ibs_sent_wakes++;
 310
 311         /* Start retransmit timer */
 312         retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 313         mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 314
 315         spin_unlock(&qca->hci_ibs_lock);
 316
 317         /* Actually send the packets */
 318         hci_uart_tx_wakeup(hu);
 319 }
 320
 321 static void qca_wq_awake_rx(struct work_struct *work)
 322 {
 323         struct qca_data *qca = container_of(work, struct qca_data,
 324                                             ws_awake_rx);
 325         struct hci_uart *hu = qca->hu;
 326
 327         BT_DBG("hu %p wq awake rx", hu);
 328
 329         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
 330
 331         spin_lock(&qca->hci_ibs_lock);
 332         qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
 333
 334         /* Always acknowledge device wake up,
 335          * sending IBS message doesn't count as TX ON.
 336          */
 337         if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
 338                 BT_ERR("Failed to acknowledge device wake up");
 339
 340         qca->ibs_sent_wacks++;
 341
 342         spin_unlock(&qca->hci_ibs_lock);
 343
 344         /* Actually send the packets */
 345         hci_uart_tx_wakeup(hu);
 346 }
 347
 348 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
 349 {
 350         struct qca_data *qca = container_of(work, struct qca_data,
 351                                             ws_rx_vote_off);
 352         struct hci_uart *hu = qca->hu;
 353
 354         BT_DBG("hu %p rx clock vote off", hu);
 355
 356         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
 357 }
 358
 359 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
 360 {
 361         struct qca_data *qca = container_of(work, struct qca_data,
 362                                             ws_tx_vote_off);
 363         struct hci_uart *hu = qca->hu;
 364
 365         BT_DBG("hu %p tx clock vote off", hu);
 366
 367         /* Run HCI tx handling unlocked */
 368         hci_uart_tx_wakeup(hu);
 369
 370         /* Now that message queued to tty driver, vote for tty clocks off.
 371          * It is up to the tty driver to pend the clocks off until tx done.
 372          */
 373         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
 374 }
 375
 376 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 377 {
 378         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 379         struct hci_uart *hu = qca->hu;
 380         unsigned long flags;
 381
 382         BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
 383
 384         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 385                                  flags, SINGLE_DEPTH_NESTING);
 386
 387         switch (qca->tx_ibs_state) {
 388         case HCI_IBS_TX_AWAKE:
 389                 /* TX_IDLE, go to SLEEP */
 390                 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
 391                         BT_ERR("Failed to send SLEEP to device");
 392                         break;
 393                 }
 394                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 395                 qca->ibs_sent_slps++;
 396                 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
 397                 break;
 398
 399         case HCI_IBS_TX_ASLEEP:
 400         case HCI_IBS_TX_WAKING:
 401                 /* Fall through */
 402
 403         default:
 404                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 405                 break;
 406         }
 407
 408         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 409 }
 410
 411 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 412 {
 413         struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
 414         struct hci_uart *hu = qca->hu;
 415         unsigned long flags, retrans_delay;
 416         bool retransmit = false;
 417
 418         BT_DBG("hu %p wake retransmit timeout in %d state",
 419                 hu, qca->tx_ibs_state);
 420
 421         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 422                                  flags, SINGLE_DEPTH_NESTING);
 423
 424         switch (qca->tx_ibs_state) {
 425         case HCI_IBS_TX_WAKING:
 426                 /* No WAKE_ACK, retransmit WAKE */
 427                 retransmit = true;
 428                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
 429                         BT_ERR("Failed to acknowledge device wake up");
 430                         break;
 431                 }
 432                 qca->ibs_sent_wakes++;
 433                 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 434                 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 435                 break;
 436
 437         case HCI_IBS_TX_ASLEEP:
 438         case HCI_IBS_TX_AWAKE:
 439                 /* Fall through */
 440
 441         default:
 442                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 443                 break;
 444         }
 445
 446         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 447
 448         if (retransmit)
 449                 hci_uart_tx_wakeup(hu);
 450 }
 451
 452 /* Initialize protocol */
 453 static int qca_open(struct hci_uart *hu)
 454 {
 455         struct qca_serdev *qcadev;
 456         struct qca_data *qca;
 457         int ret;
 458
 459         BT_DBG("hu %p qca_open", hu);
 460
 461         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 462         if (!qca)
 463                 return -ENOMEM;
 464
 465         skb_queue_head_init(&qca->txq);
 466         skb_queue_head_init(&qca->tx_wait_q);
 467         spin_lock_init(&qca->hci_ibs_lock);
 468         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 469         if (!qca->workqueue) {
 470                 BT_ERR("QCA Workqueue not initialized properly");
 471                 kfree(qca);
 472                 return -ENOMEM;
 473         }
 474
 475         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 476         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 477         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 478         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 479
 480         qca->hu = hu;
 481
 482         /* Assume we start with both sides asleep -- extra wakes OK */
 483         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 484         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 485
 486         /* clocks actually on, but we start votes off */
 487         qca->tx_vote = false;
 488         qca->rx_vote = false;
 489         qca->flags = 0;
 490
 491         qca->ibs_sent_wacks = 0;
 492         qca->ibs_sent_slps = 0;
 493         qca->ibs_sent_wakes = 0;
 494         qca->ibs_recv_wacks = 0;
 495         qca->ibs_recv_slps = 0;
 496         qca->ibs_recv_wakes = 0;
 497         qca->vote_last_jif = jiffies;
 498         qca->vote_on_ms = 0;
 499         qca->vote_off_ms = 0;
 500         qca->votes_on = 0;
 501         qca->votes_off = 0;
 502         qca->tx_votes_on = 0;
 503         qca->tx_votes_off = 0;
 504         qca->rx_votes_on = 0;
 505         qca->rx_votes_off = 0;
 506
 507         hu->priv = qca;
 508
 509         if (hu->serdev) {
 510
 511                 qcadev = serdev_device_get_drvdata(hu->serdev);
 512                 if (!qca_is_wcn399x(qcadev->btsoc_type)) {
 513                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
 514                         /* Controller needs time to bootup. */
 515                         msleep(150);
 516                 } else {
 517                         hu->init_speed = qcadev->init_speed;
 518                         hu->oper_speed = qcadev->oper_speed;
 519                         ret = qca_power_setup(hu, true);
 520                         if (ret) {
 521                                 destroy_workqueue(qca->workqueue);
 522                                 kfree_skb(qca->rx_skb);
 523                                 hu->priv = NULL;
 524                                 kfree(qca);
 525                                 return ret;
 526                         }
 527                 }
 528         }
 529
 530         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 531         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 532
 533         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 534         qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
 535
 536         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 537                qca->tx_idle_delay, qca->wake_retrans);
 538
 539         return 0;
 540 }
 541
 542 static void qca_debugfs_init(struct hci_dev *hdev)
 543 {
 544         struct hci_uart *hu = hci_get_drvdata(hdev);
 545         struct qca_data *qca = hu->priv;
 546         struct dentry *ibs_dir;
 547         umode_t mode;
 548
 549         if (!hdev->debugfs)
 550                 return;
 551
 552         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 553
 554         /* read only */
 555         mode = S_IRUGO;
 556         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 557         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 558         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 559                            &qca->ibs_sent_slps);
 560         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 561                            &qca->ibs_sent_wakes);
 562         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 563                            &qca->ibs_sent_wacks);
 564         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 565                            &qca->ibs_recv_slps);
 566         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 567                            &qca->ibs_recv_wakes);
 568         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 569                            &qca->ibs_recv_wacks);
 570         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 571         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 572         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 573         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 574         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 575         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 576         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 577         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 578         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 579         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 580
 581         /* read/write */
 582         mode = S_IRUGO | S_IWUSR;
 583         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 584         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 585                            &qca->tx_idle_delay);
 586 }
 587
 588 /* Flush protocol data */
 589 static int qca_flush(struct hci_uart *hu)
 590 {
 591         struct qca_data *qca = hu->priv;
 592
 593         BT_DBG("hu %p qca flush", hu);
 594
 595         skb_queue_purge(&qca->tx_wait_q);
 596         skb_queue_purge(&qca->txq);
 597
 598         return 0;
 599 }
 600
 601 /* Close protocol */
 602 static int qca_close(struct hci_uart *hu)
 603 {
 604         struct qca_serdev *qcadev;
 605         struct qca_data *qca = hu->priv;
 606
 607         BT_DBG("hu %p qca close", hu);
 608
 609         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 610
 611         skb_queue_purge(&qca->tx_wait_q);
 612         skb_queue_purge(&qca->txq);
 613         del_timer(&qca->tx_idle_timer);
 614         del_timer(&qca->wake_retrans_timer);
 615         destroy_workqueue(qca->workqueue);
 616         qca->hu = NULL;
 617
 618         if (hu->serdev) {
 619                 qcadev = serdev_device_get_drvdata(hu->serdev);
 620                 if (qca_is_wcn399x(qcadev->btsoc_type))
 621                         qca_power_shutdown(hu);
 622                 else
 623                         gpiod_set_value_cansleep(qcadev->bt_en, 0);
 624
 625         }
 626
 627         kfree_skb(qca->rx_skb);
 628
 629         hu->priv = NULL;
 630
 631         kfree(qca);
 632
 633         return 0;
 634 }
 635
 636 /* Called upon a wake-up-indication from the device.
 637  */
 638 static void device_want_to_wakeup(struct hci_uart *hu)
 639 {
 640         unsigned long flags;
 641         struct qca_data *qca = hu->priv;
 642
 643         BT_DBG("hu %p want to wake up", hu);
 644
 645         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 646
 647         qca->ibs_recv_wakes++;
 648
 649         switch (qca->rx_ibs_state) {
 650         case HCI_IBS_RX_ASLEEP:
 651                 /* Make sure clock is on - we may have turned clock off since
 652                  * receiving the wake up indicator awake rx clock.
 653                  */
 654                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 655                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 656                 return;
 657
 658         case HCI_IBS_RX_AWAKE:
 659                 /* Always acknowledge device wake up,
 660                  * sending IBS message doesn't count as TX ON.
 661                  */
 662                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 663                         BT_ERR("Failed to acknowledge device wake up");
 664                         break;
 665                 }
 666                 qca->ibs_sent_wacks++;
 667                 break;
 668
 669         default:
 670                 /* Any other state is illegal */
 671                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 672                        qca->rx_ibs_state);
 673                 break;
 674         }
 675
 676         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 677
 678         /* Actually send the packets */
 679         hci_uart_tx_wakeup(hu);
 680 }
 681
 682 /* Called upon a sleep-indication from the device.
 683  */
 684 static void device_want_to_sleep(struct hci_uart *hu)
 685 {
 686         unsigned long flags;
 687         struct qca_data *qca = hu->priv;
 688
 689         BT_DBG("hu %p want to sleep", hu);
 690
 691         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 692
 693         qca->ibs_recv_slps++;
 694
 695         switch (qca->rx_ibs_state) {
 696         case HCI_IBS_RX_AWAKE:
 697                 /* Update state */
 698                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 699                 /* Vote off rx clock under workqueue */
 700                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 701                 break;
 702
 703         case HCI_IBS_RX_ASLEEP:
 704                 /* Fall through */
 705
 706         default:
 707                 /* Any other state is illegal */
 708                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 709                        qca->rx_ibs_state);
 710                 break;
 711         }
 712
 713         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 714 }
 715
 716 /* Called upon wake-up-acknowledgement from the device
 717  */
 718 static void device_woke_up(struct hci_uart *hu)
 719 {
 720         unsigned long flags, idle_delay;
 721         struct qca_data *qca = hu->priv;
 722         struct sk_buff *skb = NULL;
 723
 724         BT_DBG("hu %p woke up", hu);
 725
 726         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 727
 728         qca->ibs_recv_wacks++;
 729
 730         switch (qca->tx_ibs_state) {
 731         case HCI_IBS_TX_AWAKE:
 732                 /* Expect one if we send 2 WAKEs */
 733                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 734                        qca->tx_ibs_state);
 735                 break;
 736
 737         case HCI_IBS_TX_WAKING:
 738                 /* Send pending packets */
 739                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 740                         skb_queue_tail(&qca->txq, skb);
 741
 742                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 743                 del_timer(&qca->wake_retrans_timer);
 744                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 745                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 746                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 747                 break;
 748
 749         case HCI_IBS_TX_ASLEEP:
 750                 /* Fall through */
 751
 752         default:
 753                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 754                        qca->tx_ibs_state);
 755                 break;
 756         }
 757
 758         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 759
 760         /* Actually send the packets */
 761         hci_uart_tx_wakeup(hu);
 762 }
 763
 764 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 765  * two simultaneous tasklets.
 766  */
 767 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 768 {
 769         unsigned long flags = 0, idle_delay;
 770         struct qca_data *qca = hu->priv;
 771
 772         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 773                qca->tx_ibs_state);
 774
 775         /* Prepend skb with frame type */
 776         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 777
 778         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 779
 780         /* Don't go to sleep in middle of patch download or
 781          * Out-Of-Band(GPIOs control) sleep is selected.
 782          */
 783         if (!test_bit(QCA_IBS_ENABLED, &qca->flags)) {
 784                 skb_queue_tail(&qca->txq, skb);
 785                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 786                 return 0;
 787         }
 788
 789         /* Act according to current state */
 790         switch (qca->tx_ibs_state) {
 791         case HCI_IBS_TX_AWAKE:
 792                 BT_DBG("Device awake, sending normally");
 793                 skb_queue_tail(&qca->txq, skb);
 794                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 795                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 796                 break;
 797
 798         case HCI_IBS_TX_ASLEEP:
 799                 BT_DBG("Device asleep, waking up and queueing packet");
 800                 /* Save packet for later */
 801                 skb_queue_tail(&qca->tx_wait_q, skb);
 802
 803                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 804                 /* Schedule a work queue to wake up device */
 805                 queue_work(qca->workqueue, &qca->ws_awake_device);
 806                 break;
 807
 808         case HCI_IBS_TX_WAKING:
 809                 BT_DBG("Device waking up, queueing packet");
 810                 /* Transient state; just keep packet for later */
 811                 skb_queue_tail(&qca->tx_wait_q, skb);
 812                 break;
 813
 814         default:
 815                 BT_ERR("Illegal tx state: %d (losing packet)",
 816                        qca->tx_ibs_state);
 817                 kfree_skb(skb);
 818                 break;
 819         }
 820
 821         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 822
 823         return 0;
 824 }
 825
 826 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 827 {
 828         struct hci_uart *hu = hci_get_drvdata(hdev);
 829
 830         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 831
 832         device_want_to_sleep(hu);
 833
 834         kfree_skb(skb);
 835         return 0;
 836 }
 837
 838 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 839 {
 840         struct hci_uart *hu = hci_get_drvdata(hdev);
 841
 842         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 843
 844         device_want_to_wakeup(hu);
 845
 846         kfree_skb(skb);
 847         return 0;
 848 }
 849
 850 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 851 {
 852         struct hci_uart *hu = hci_get_drvdata(hdev);
 853
 854         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 855
 856         device_woke_up(hu);
 857
 858         kfree_skb(skb);
 859         return 0;
 860 }
 861
 862 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 863 {
 864         /* We receive debug logs from chip as an ACL packets.
 865          * Instead of sending the data to ACL to decode the
 866          * received data, we are pushing them to the above layers
 867          * as a diagnostic packet.
 868          */
 869         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 870                 return hci_recv_diag(hdev, skb);
 871
 872         return hci_recv_frame(hdev, skb);
 873 }
 874
 875 #define QCA_IBS_SLEEP_IND_EVENT \
 876         .type = HCI_IBS_SLEEP_IND, \
 877         .hlen = 0, \
 878         .loff = 0, \
 879         .lsize = 0, \
 880         .maxlen = HCI_MAX_IBS_SIZE
 881
 882 #define QCA_IBS_WAKE_IND_EVENT \
 883         .type = HCI_IBS_WAKE_IND, \
 884         .hlen = 0, \
 885         .loff = 0, \
 886         .lsize = 0, \
 887         .maxlen = HCI_MAX_IBS_SIZE
 888
 889 #define QCA_IBS_WAKE_ACK_EVENT \
 890         .type = HCI_IBS_WAKE_ACK, \
 891         .hlen = 0, \
 892         .loff = 0, \
 893         .lsize = 0, \
 894         .maxlen = HCI_MAX_IBS_SIZE
 895
 896 static const struct h4_recv_pkt qca_recv_pkts[] = {
 897         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
 898         { H4_RECV_SCO,             .recv = hci_recv_frame    },
 899         { H4_RECV_EVENT,           .recv = hci_recv_frame    },
 900         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
 901         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
 902         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
 903 };
 904
 905 static int qca_recv(struct hci_uart *hu, const void *data, int count)
 906 {
 907         struct qca_data *qca = hu->priv;
 908
 909         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 910                 return -EUNATCH;
 911
 912         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
 913                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
 914         if (IS_ERR(qca->rx_skb)) {
 915                 int err = PTR_ERR(qca->rx_skb);
 916                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 917                 qca->rx_skb = NULL;
 918                 return err;
 919         }
 920
 921         return count;
 922 }
 923
 924 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
 925 {
 926         struct qca_data *qca = hu->priv;
 927
 928         return skb_dequeue(&qca->txq);
 929 }
 930
 931 static uint8_t qca_get_baudrate_value(int speed)
 932 {
 933         switch (speed) {
 934         case 9600:
 935                 return QCA_BAUDRATE_9600;
 936         case 19200:
 937                 return QCA_BAUDRATE_19200;
 938         case 38400:
 939                 return QCA_BAUDRATE_38400;
 940         case 57600:
 941                 return QCA_BAUDRATE_57600;
 942         case 115200:
 943                 return QCA_BAUDRATE_115200;
 944         case 230400:
 945                 return QCA_BAUDRATE_230400;
 946         case 460800:
 947                 return QCA_BAUDRATE_460800;
 948         case 500000:
 949                 return QCA_BAUDRATE_500000;
 950         case 921600:
 951                 return QCA_BAUDRATE_921600;
 952         case 1000000:
 953                 return QCA_BAUDRATE_1000000;
 954         case 2000000:
 955                 return QCA_BAUDRATE_2000000;
 956         case 3000000:
 957                 return QCA_BAUDRATE_3000000;
 958         case 3200000:
 959                 return QCA_BAUDRATE_3200000;
 960         case 3500000:
 961                 return QCA_BAUDRATE_3500000;
 962         default:
 963                 return QCA_BAUDRATE_115200;
 964         }
 965 }
 966
 967 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 968 {
 969         struct hci_uart *hu = hci_get_drvdata(hdev);
 970         struct qca_data *qca = hu->priv;
 971         struct sk_buff *skb;
 972         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
 973
 974         if (baudrate > QCA_BAUDRATE_3200000)
 975                 return -EINVAL;
 976
 977         cmd[4] = baudrate;
 978
 979         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
 980         if (!skb) {
 981                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
 982                 return -ENOMEM;
 983         }
 984
 985         /* Assign commands to change baudrate and packet type. */
 986         skb_put_data(skb, cmd, sizeof(cmd));
 987         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
 988
 989         skb_queue_tail(&qca->txq, skb);
 990         hci_uart_tx_wakeup(hu);
 991
 992         /* Wait for the baudrate change request to be sent */
 993
 994         while (!skb_queue_empty(&qca->txq))
 995                 usleep_range(100, 200);
 996
 997         if (hu->serdev)
 998                 serdev_device_wait_until_sent(hu->serdev,
 999                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1000
1001         /* Give the controller time to process the request */
1002         if (qca_is_wcn399x(qca_soc_type(hu)))
1003                 msleep(10);
1004         else
1005                 msleep(300);
1006
1007         return 0;
1008 }
1009
1010 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1011 {
1012         if (hu->serdev)
1013                 serdev_device_set_baudrate(hu->serdev, speed);
1014         else
1015                 hci_uart_set_baudrate(hu, speed);
1016 }
1017
1018 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1019 {
1020         int ret;
1021         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1022         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1023
1024         /* These power pulses are single byte command which are sent
1025          * at required baudrate to wcn3990. On wcn3990, we have an external
1026          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1027          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1028          * and also we use the same power inputs to turn on and off for
1029          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1030          * we send a power on pulse at 115200 bps. This algorithm will help to
1031          * save power. Disabling hardware flow control is mandatory while
1032          * sending power pulses to SoC.
1033          */
1034         bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1035
1036         serdev_device_write_flush(hu->serdev);
1037         hci_uart_set_flow_control(hu, true);
1038         ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1039         if (ret < 0) {
1040                 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1041                 return ret;
1042         }
1043
1044         serdev_device_wait_until_sent(hu->serdev, timeout);
1045         hci_uart_set_flow_control(hu, false);
1046
1047         /* Give to controller time to boot/shutdown */
1048         if (on)
1049                 msleep(100);
1050         else
1051                 msleep(10);
1052
1053         return 0;
1054 }
1055
1056 static unsigned int qca_get_speed(struct hci_uart *hu,
1057                                   enum qca_speed_type speed_type)
1058 {
1059         unsigned int speed = 0;
1060
1061         if (speed_type == QCA_INIT_SPEED) {
1062                 if (hu->init_speed)
1063                         speed = hu->init_speed;
1064                 else if (hu->proto->init_speed)
1065                         speed = hu->proto->init_speed;
1066         } else {
1067                 if (hu->oper_speed)
1068                         speed = hu->oper_speed;
1069                 else if (hu->proto->oper_speed)
1070                         speed = hu->proto->oper_speed;
1071         }
1072
1073         return speed;
1074 }
1075
1076 static int qca_check_speeds(struct hci_uart *hu)
1077 {
1078         if (qca_is_wcn399x(qca_soc_type(hu))) {
1079                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1080                     !qca_get_speed(hu, QCA_OPER_SPEED))
1081                         return -EINVAL;
1082         } else {
1083                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1084                     !qca_get_speed(hu, QCA_OPER_SPEED))
1085                         return -EINVAL;
1086         }
1087
1088         return 0;
1089 }
1090
1091 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1092 {
1093         unsigned int speed, qca_baudrate;
1094         int ret = 0;
1095
1096         if (speed_type == QCA_INIT_SPEED) {
1097                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1098                 if (speed)
1099                         host_set_baudrate(hu, speed);
1100         } else {
1101                 enum qca_btsoc_type soc_type = qca_soc_type(hu);
1102
1103                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1104                 if (!speed)
1105                         return 0;
1106
1107                 /* Disable flow control for wcn3990 to deassert RTS while
1108                  * changing the baudrate of chip and host.
1109                  */
1110                 if (qca_is_wcn399x(soc_type))
1111                         hci_uart_set_flow_control(hu, true);
1112
1113                 qca_baudrate = qca_get_baudrate_value(speed);
1114                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1115                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1116                 if (ret)
1117                         goto error;
1118
1119                 host_set_baudrate(hu, speed);
1120
1121 error:
1122                 if (qca_is_wcn399x(soc_type))
1123                         hci_uart_set_flow_control(hu, false);
1124         }
1125
1126         return ret;
1127 }
1128
1129 static int qca_wcn3990_init(struct hci_uart *hu)
1130 {
1131         struct qca_serdev *qcadev;
1132         int ret;
1133
1134         /* Check for vregs status, may be hci down has turned
1135          * off the voltage regulator.
1136          */
1137         qcadev = serdev_device_get_drvdata(hu->serdev);
1138         if (!qcadev->bt_power->vregs_on) {
1139                 serdev_device_close(hu->serdev);
1140                 ret = qca_power_setup(hu, true);
1141                 if (ret)
1142                         return ret;
1143
1144                 ret = serdev_device_open(hu->serdev);
1145                 if (ret) {
1146                         bt_dev_err(hu->hdev, "failed to open port");
1147                         return ret;
1148                 }
1149         }
1150
1151         /* Forcefully enable wcn3990 to enter in to boot mode. */
1152         host_set_baudrate(hu, 2400);
1153         ret = qca_send_power_pulse(hu, false);
1154         if (ret)
1155                 return ret;
1156
1157         qca_set_speed(hu, QCA_INIT_SPEED);
1158         ret = qca_send_power_pulse(hu, true);
1159         if (ret)
1160                 return ret;
1161
1162         /* Now the device is in ready state to communicate with host.
1163          * To sync host with device we need to reopen port.
1164          * Without this, we will have RTS and CTS synchronization
1165          * issues.
1166          */
1167         serdev_device_close(hu->serdev);
1168         ret = serdev_device_open(hu->serdev);
1169         if (ret) {
1170                 bt_dev_err(hu->hdev, "failed to open port");
1171                 return ret;
1172         }
1173
1174         hci_uart_set_flow_control(hu, false);
1175
1176         return 0;
1177 }
1178
1179 static int qca_setup(struct hci_uart *hu)
1180 {
1181         struct hci_dev *hdev = hu->hdev;
1182         struct qca_data *qca = hu->priv;
1183         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1184         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1185         int ret;
1186         int soc_ver = 0;
1187
1188         ret = qca_check_speeds(hu);
1189         if (ret)
1190                 return ret;
1191
1192         /* Patch downloading has to be done without IBS mode */
1193         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1194
1195         if (qca_is_wcn399x(soc_type)) {
1196                 bt_dev_info(hdev, "setting up wcn3990");
1197
1198                 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute
1199                  * setup for every hci up.
1200                  */
1201                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1202                 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1203                 hu->hdev->shutdown = qca_power_off;
1204                 ret = qca_wcn3990_init(hu);
1205                 if (ret)
1206                         return ret;
1207
1208                 ret = qca_read_soc_version(hdev, &soc_ver);
1209                 if (ret)
1210                         return ret;
1211         } else {
1212                 bt_dev_info(hdev, "ROME setup");
1213                 qca_set_speed(hu, QCA_INIT_SPEED);
1214         }
1215
1216         /* Setup user speed if needed */
1217         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1218         if (speed) {
1219                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1220                 if (ret)
1221                         return ret;
1222
1223                 qca_baudrate = qca_get_baudrate_value(speed);
1224         }
1225
1226         if (!qca_is_wcn399x(soc_type)) {
1227                 /* Get QCA version information */
1228                 ret = qca_read_soc_version(hdev, &soc_ver);
1229                 if (ret)
1230                         return ret;
1231         }
1232
1233         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1234         /* Setup patch / NVM configurations */
1235         ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver);
1236         if (!ret) {
1237                 set_bit(QCA_IBS_ENABLED, &qca->flags);
1238                 qca_debugfs_init(hdev);
1239         } else if (ret == -ENOENT) {
1240                 /* No patch/nvm-config found, run with original fw/config */
1241                 ret = 0;
1242         } else if (ret == -EAGAIN) {
1243                 /*
1244                  * Userspace firmware loader will return -EAGAIN in case no
1245                  * patch/nvm-config is found, so run with original fw/config.
1246                  */
1247                 ret = 0;
1248         }
1249
1250         /* Setup bdaddr */
1251         if (qca_is_wcn399x(soc_type))
1252                 hu->hdev->set_bdaddr = qca_set_bdaddr;
1253         else
1254                 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1255
1256         return ret;
1257 }
1258
1259 static struct hci_uart_proto qca_proto = {
1260         .id             = HCI_UART_QCA,
1261         .name           = "QCA",
1262         .manufacturer   = 29,
1263         .init_speed     = 115200,
1264         .oper_speed     = 3000000,
1265         .open           = qca_open,
1266         .close          = qca_close,
1267         .flush          = qca_flush,
1268         .setup          = qca_setup,
1269         .recv           = qca_recv,
1270         .enqueue        = qca_enqueue,
1271         .dequeue        = qca_dequeue,
1272 };
1273
1274 static const struct qca_vreg_data qca_soc_data_wcn3990 = {
1275         .soc_type = QCA_WCN3990,
1276         .vregs = (struct qca_vreg []) {
1277                 { "vddio",   1800000, 1900000,  15000  },
1278                 { "vddxo",   1800000, 1900000,  80000  },
1279                 { "vddrf",   1300000, 1350000,  300000 },
1280                 { "vddch0",  3300000, 3400000,  450000 },
1281         },
1282         .num_vregs = 4,
1283 };
1284
1285 static const struct qca_vreg_data qca_soc_data_wcn3998 = {
1286         .soc_type = QCA_WCN3998,
1287         .vregs = (struct qca_vreg []) {
1288                 { "vddio",   1800000, 1900000,  10000  },
1289                 { "vddxo",   1800000, 1900000,  80000  },
1290                 { "vddrf",   1300000, 1352000,  300000 },
1291                 { "vddch0",  3300000, 3300000,  450000 },
1292         },
1293         .num_vregs = 4,
1294 };
1295
1296 static void qca_power_shutdown(struct hci_uart *hu)
1297 {
1298         struct qca_data *qca = hu->priv;
1299         unsigned long flags;
1300
1301         /* From this point we go into power off state. But serial port is
1302          * still open, stop queueing the IBS data and flush all the buffered
1303          * data in skb's.
1304          */
1305         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1306         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1307         qca_flush(hu);
1308         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1309
1310         host_set_baudrate(hu, 2400);
1311         qca_send_power_pulse(hu, false);
1312         qca_power_setup(hu, false);
1313 }
1314
1315 static int qca_power_off(struct hci_dev *hdev)
1316 {
1317         struct hci_uart *hu = hci_get_drvdata(hdev);
1318
1319         qca_power_shutdown(hu);
1320         return 0;
1321 }
1322
1323 static int qca_enable_regulator(struct qca_vreg vregs,
1324                                 struct regulator *regulator)
1325 {
1326         int ret;
1327
1328         ret = regulator_set_voltage(regulator, vregs.min_uV,
1329                                     vregs.max_uV);
1330         if (ret)
1331                 return ret;
1332
1333         if (vregs.load_uA)
1334                 ret = regulator_set_load(regulator,
1335                                          vregs.load_uA);
1336
1337         if (ret)
1338                 return ret;
1339
1340         return regulator_enable(regulator);
1341
1342 }
1343
1344 static void qca_disable_regulator(struct qca_vreg vregs,
1345                                   struct regulator *regulator)
1346 {
1347         regulator_disable(regulator);
1348         regulator_set_voltage(regulator, 0, vregs.max_uV);
1349         if (vregs.load_uA)
1350                 regulator_set_load(regulator, 0);
1351
1352 }
1353
1354 static int qca_power_setup(struct hci_uart *hu, bool on)
1355 {
1356         struct qca_vreg *vregs;
1357         struct regulator_bulk_data *vreg_bulk;
1358         struct qca_serdev *qcadev;
1359         int i, num_vregs, ret = 0;
1360
1361         qcadev = serdev_device_get_drvdata(hu->serdev);
1362         if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1363             !qcadev->bt_power->vreg_bulk)
1364                 return -EINVAL;
1365
1366         vregs = qcadev->bt_power->vreg_data->vregs;
1367         vreg_bulk = qcadev->bt_power->vreg_bulk;
1368         num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1369         BT_DBG("on: %d", on);
1370         if (on && !qcadev->bt_power->vregs_on) {
1371                 for (i = 0; i < num_vregs; i++) {
1372                         ret = qca_enable_regulator(vregs[i],
1373                                                    vreg_bulk[i].consumer);
1374                         if (ret)
1375                                 break;
1376                 }
1377
1378                 if (ret) {
1379                         BT_ERR("failed to enable regulator:%s", vregs[i].name);
1380                         /* turn off regulators which are enabled */
1381                         for (i = i - 1; i >= 0; i--)
1382                                 qca_disable_regulator(vregs[i],
1383                                                       vreg_bulk[i].consumer);
1384                 } else {
1385                         qcadev->bt_power->vregs_on = true;
1386                 }
1387         } else if (!on && qcadev->bt_power->vregs_on) {
1388                 /* turn off regulator in reverse order */
1389                 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1390                 for ( ; i >= 0; i--)
1391                         qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1392
1393                 qcadev->bt_power->vregs_on = false;
1394         }
1395
1396         return ret;
1397 }
1398
1399 static int qca_init_regulators(struct qca_power *qca,
1400                                 const struct qca_vreg *vregs, size_t num_vregs)
1401 {
1402         int i;
1403
1404         qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs,
1405                                       sizeof(struct regulator_bulk_data),
1406                                       GFP_KERNEL);
1407         if (!qca->vreg_bulk)
1408                 return -ENOMEM;
1409
1410         for (i = 0; i < num_vregs; i++)
1411                 qca->vreg_bulk[i].supply = vregs[i].name;
1412
1413         return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1414 }
1415
1416 static int qca_serdev_probe(struct serdev_device *serdev)
1417 {
1418         struct qca_serdev *qcadev;
1419         const struct qca_vreg_data *data;
1420         int err;
1421
1422         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1423         if (!qcadev)
1424                 return -ENOMEM;
1425
1426         qcadev->serdev_hu.serdev = serdev;
1427         data = of_device_get_match_data(&serdev->dev);
1428         serdev_device_set_drvdata(serdev, qcadev);
1429         if (data && qca_is_wcn399x(data->soc_type)) {
1430                 qcadev->btsoc_type = data->soc_type;
1431                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1432                                                 sizeof(struct qca_power),
1433                                                 GFP_KERNEL);
1434                 if (!qcadev->bt_power)
1435                         return -ENOMEM;
1436
1437                 qcadev->bt_power->dev = &serdev->dev;
1438                 qcadev->bt_power->vreg_data = data;
1439                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1440                                           data->num_vregs);
1441                 if (err) {
1442                         BT_ERR("Failed to init regulators:%d", err);
1443                         goto out;
1444                 }
1445
1446                 qcadev->bt_power->vregs_on = false;
1447
1448                 device_property_read_u32(&serdev->dev, "max-speed",
1449                                          &qcadev->oper_speed);
1450                 if (!qcadev->oper_speed)
1451                         BT_DBG("UART will pick default operating speed");
1452
1453                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1454                 if (err) {
1455                         BT_ERR("wcn3990 serdev registration failed");
1456                         goto out;
1457                 }
1458         } else {
1459                 qcadev->btsoc_type = QCA_ROME;
1460                 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1461                                                GPIOD_OUT_LOW);
1462                 if (IS_ERR(qcadev->bt_en)) {
1463                         dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1464                         return PTR_ERR(qcadev->bt_en);
1465                 }
1466
1467                 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1468                 if (IS_ERR(qcadev->susclk)) {
1469                         dev_err(&serdev->dev, "failed to acquire clk\n");
1470                         return PTR_ERR(qcadev->susclk);
1471                 }
1472
1473                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1474                 if (err)
1475                         return err;
1476
1477                 err = clk_prepare_enable(qcadev->susclk);
1478                 if (err)
1479                         return err;
1480
1481                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1482                 if (err)
1483                         clk_disable_unprepare(qcadev->susclk);
1484         }
1485
1486 out:    return err;
1487
1488 }
1489
1490 static void qca_serdev_remove(struct serdev_device *serdev)
1491 {
1492         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1493
1494         if (qca_is_wcn399x(qcadev->btsoc_type))
1495                 qca_power_shutdown(&qcadev->serdev_hu);
1496         else
1497                 clk_disable_unprepare(qcadev->susclk);
1498
1499         hci_uart_unregister_device(&qcadev->serdev_hu);
1500 }
1501
1502 static const struct of_device_id qca_bluetooth_of_match[] = {
1503         { .compatible = "qcom,qca6174-bt" },
1504         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
1505         { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
1506         { /* sentinel */ }
1507 };
1508 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1509
1510 static struct serdev_device_driver qca_serdev_driver = {
1511         .probe = qca_serdev_probe,
1512         .remove = qca_serdev_remove,
1513         .driver = {
1514                 .name = "hci_uart_qca",
1515                 .of_match_table = qca_bluetooth_of_match,
1516         },
1517 };
1518
1519 int __init qca_init(void)
1520 {
1521         serdev_device_driver_register(&qca_serdev_driver);
1522
1523         return hci_uart_register_proto(&qca_proto);
1524 }
1525
1526 int __exit qca_deinit(void)
1527 {
1528         serdev_device_driver_unregister(&qca_serdev_driver);
1529
1530         return hci_uart_unregister_proto(&qca_proto);
1531 }