drivers/bluetooth/hci_qca.c

   1 /*
   2  *  Bluetooth Software UART Qualcomm protocol
   3  *
   4  *  HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management
   5  *  protocol extension to H4.
   6  *
   7  *  Copyright (C) 2007 Texas Instruments, Inc.
   8  *  Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved.
   9  *
  10  *  Acknowledgements:
  11  *  This file is based on hci_ll.c, which was...
  12  *  Written by Ohad Ben-Cohen <ohad@bencohen.org>
  13  *  which was in turn based on hci_h4.c, which was written
  14  *  by Maxim Krasnyansky and Marcel Holtmann.
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License version 2
  18  *  as published by the Free Software Foundation
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program; if not, write to the Free Software
  27  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  28  *
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/clk.h>
  33 #include <linux/debugfs.h>
  34 #include <linux/delay.h>
  35 #include <linux/device.h>
  36 #include <linux/gpio/consumer.h>
  37 #include <linux/mod_devicetable.h>
  38 #include <linux/module.h>
  39 #include <linux/of_device.h>
  40 #include <linux/platform_device.h>
  41 #include <linux/regulator/consumer.h>
  42 #include <linux/serdev.h>
  43 #include <asm/unaligned.h>
  44
  45 #include <net/bluetooth/bluetooth.h>
  46 #include <net/bluetooth/hci_core.h>
  47
  48 #include "hci_uart.h"
  49 #include "btqca.h"
  50
  51 /* HCI_IBS protocol messages */
  52 #define HCI_IBS_SLEEP_IND       0xFE
  53 #define HCI_IBS_WAKE_IND        0xFD
  54 #define HCI_IBS_WAKE_ACK        0xFC
  55 #define HCI_MAX_IBS_SIZE        10
  56
  57 #define IBS_WAKE_RETRANS_TIMEOUT_MS     100
  58 #define IBS_TX_IDLE_TIMEOUT_MS          2000
  59 #define CMD_TRANS_TIMEOUT_MS            100
  60
  61 /* susclk rate */
  62 #define SUSCLK_RATE_32KHZ       32768
  63
  64 /* Controller debug log header */
  65 #define QCA_DEBUG_HANDLE        0x2EDC
  66
  67 enum qca_flags {
  68         QCA_IBS_ENABLED,
  69 };
  70
  71 /* HCI_IBS transmit side sleep protocol states */
  72 enum tx_ibs_states {
  73         HCI_IBS_TX_ASLEEP,
  74         HCI_IBS_TX_WAKING,
  75         HCI_IBS_TX_AWAKE,
  76 };
  77
  78 /* HCI_IBS receive side sleep protocol states */
  79 enum rx_states {
  80         HCI_IBS_RX_ASLEEP,
  81         HCI_IBS_RX_AWAKE,
  82 };
  83
  84 /* HCI_IBS transmit and receive side clock state vote */
  85 enum hci_ibs_clock_state_vote {
  86         HCI_IBS_VOTE_STATS_UPDATE,
  87         HCI_IBS_TX_VOTE_CLOCK_ON,
  88         HCI_IBS_TX_VOTE_CLOCK_OFF,
  89         HCI_IBS_RX_VOTE_CLOCK_ON,
  90         HCI_IBS_RX_VOTE_CLOCK_OFF,
  91 };
  92
  93 struct qca_data {
  94         struct hci_uart *hu;
  95         struct sk_buff *rx_skb;
  96         struct sk_buff_head txq;
  97         struct sk_buff_head tx_wait_q;  /* HCI_IBS wait queue   */
  98         spinlock_t hci_ibs_lock;        /* HCI_IBS state lock   */
  99         u8 tx_ibs_state;        /* HCI_IBS transmit side power state*/
 100         u8 rx_ibs_state;        /* HCI_IBS receive side power state */
 101         bool tx_vote;           /* Clock must be on for TX */
 102         bool rx_vote;           /* Clock must be on for RX */
 103         struct timer_list tx_idle_timer;
 104         u32 tx_idle_delay;
 105         struct timer_list wake_retrans_timer;
 106         u32 wake_retrans;
 107         struct workqueue_struct *workqueue;
 108         struct work_struct ws_awake_rx;
 109         struct work_struct ws_awake_device;
 110         struct work_struct ws_rx_vote_off;
 111         struct work_struct ws_tx_vote_off;
 112         unsigned long flags;
 113
 114         /* For debugging purpose */
 115         u64 ibs_sent_wacks;
 116         u64 ibs_sent_slps;
 117         u64 ibs_sent_wakes;
 118         u64 ibs_recv_wacks;
 119         u64 ibs_recv_slps;
 120         u64 ibs_recv_wakes;
 121         u64 vote_last_jif;
 122         u32 vote_on_ms;
 123         u32 vote_off_ms;
 124         u64 tx_votes_on;
 125         u64 rx_votes_on;
 126         u64 tx_votes_off;
 127         u64 rx_votes_off;
 128         u64 votes_on;
 129         u64 votes_off;
 130 };
 131
 132 enum qca_speed_type {
 133         QCA_INIT_SPEED = 1,
 134         QCA_OPER_SPEED
 135 };
 136
 137 /*
 138  * Voltage regulator information required for configuring the
 139  * QCA Bluetooth chipset
 140  */
 141 struct qca_vreg {
 142         const char *name;
 143         unsigned int min_uV;
 144         unsigned int max_uV;
 145         unsigned int load_uA;
 146 };
 147
 148 struct qca_vreg_data {
 149         enum qca_btsoc_type soc_type;
 150         struct qca_vreg *vregs;
 151         size_t num_vregs;
 152 };
 153
 154 /*
 155  * Platform data for the QCA Bluetooth power driver.
 156  */
 157 struct qca_power {
 158         struct device *dev;
 159         const struct qca_vreg_data *vreg_data;
 160         struct regulator_bulk_data *vreg_bulk;
 161         bool vregs_on;
 162 };
 163
 164 struct qca_serdev {
 165         struct hci_uart  serdev_hu;
 166         struct gpio_desc *bt_en;
 167         struct clk       *susclk;
 168         enum qca_btsoc_type btsoc_type;
 169         struct qca_power *bt_power;
 170         u32 init_speed;
 171         u32 oper_speed;
 172 };
 173
 174 static int qca_power_setup(struct hci_uart *hu, bool on);
 175 static void qca_power_shutdown(struct hci_uart *hu);
 176 static int qca_power_off(struct hci_dev *hdev);
 177
 178 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
 179 {
 180         enum qca_btsoc_type soc_type;
 181
 182         if (hu->serdev) {
 183                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 184
 185                 soc_type = qsd->btsoc_type;
 186         } else {
 187                 soc_type = QCA_ROME;
 188         }
 189
 190         return soc_type;
 191 }
 192
 193 static void __serial_clock_on(struct tty_struct *tty)
 194 {
 195         /* TODO: Some chipset requires to enable UART clock on client
 196          * side to save power consumption or manual work is required.
 197          * Please put your code to control UART clock here if needed
 198          */
 199 }
 200
 201 static void __serial_clock_off(struct tty_struct *tty)
 202 {
 203         /* TODO: Some chipset requires to disable UART clock on client
 204          * side to save power consumption or manual work is required.
 205          * Please put your code to control UART clock off here if needed
 206          */
 207 }
 208
 209 /* serial_clock_vote needs to be called with the ibs lock held */
 210 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
 211 {
 212         struct qca_data *qca = hu->priv;
 213         unsigned int diff;
 214
 215         bool old_vote = (qca->tx_vote | qca->rx_vote);
 216         bool new_vote;
 217
 218         switch (vote) {
 219         case HCI_IBS_VOTE_STATS_UPDATE:
 220                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 221
 222                 if (old_vote)
 223                         qca->vote_off_ms += diff;
 224                 else
 225                         qca->vote_on_ms += diff;
 226                 return;
 227
 228         case HCI_IBS_TX_VOTE_CLOCK_ON:
 229                 qca->tx_vote = true;
 230                 qca->tx_votes_on++;
 231                 new_vote = true;
 232                 break;
 233
 234         case HCI_IBS_RX_VOTE_CLOCK_ON:
 235                 qca->rx_vote = true;
 236                 qca->rx_votes_on++;
 237                 new_vote = true;
 238                 break;
 239
 240         case HCI_IBS_TX_VOTE_CLOCK_OFF:
 241                 qca->tx_vote = false;
 242                 qca->tx_votes_off++;
 243                 new_vote = qca->rx_vote | qca->tx_vote;
 244                 break;
 245
 246         case HCI_IBS_RX_VOTE_CLOCK_OFF:
 247                 qca->rx_vote = false;
 248                 qca->rx_votes_off++;
 249                 new_vote = qca->rx_vote | qca->tx_vote;
 250                 break;
 251
 252         default:
 253                 BT_ERR("Voting irregularity");
 254                 return;
 255         }
 256
 257         if (new_vote != old_vote) {
 258                 if (new_vote)
 259                         __serial_clock_on(hu->tty);
 260                 else
 261                         __serial_clock_off(hu->tty);
 262
 263                 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
 264                        vote ? "true" : "false");
 265
 266                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 267
 268                 if (new_vote) {
 269                         qca->votes_on++;
 270                         qca->vote_off_ms += diff;
 271                 } else {
 272                         qca->votes_off++;
 273                         qca->vote_on_ms += diff;
 274                 }
 275                 qca->vote_last_jif = jiffies;
 276         }
 277 }
 278
 279 /* Builds and sends an HCI_IBS command packet.
 280  * These are very simple packets with only 1 cmd byte.
 281  */
 282 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
 283 {
 284         int err = 0;
 285         struct sk_buff *skb = NULL;
 286         struct qca_data *qca = hu->priv;
 287
 288         BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
 289
 290         skb = bt_skb_alloc(1, GFP_ATOMIC);
 291         if (!skb) {
 292                 BT_ERR("Failed to allocate memory for HCI_IBS packet");
 293                 return -ENOMEM;
 294         }
 295
 296         /* Assign HCI_IBS type */
 297         skb_put_u8(skb, cmd);
 298
 299         skb_queue_tail(&qca->txq, skb);
 300
 301         return err;
 302 }
 303
 304 static void qca_wq_awake_device(struct work_struct *work)
 305 {
 306         struct qca_data *qca = container_of(work, struct qca_data,
 307                                             ws_awake_device);
 308         struct hci_uart *hu = qca->hu;
 309         unsigned long retrans_delay;
 310
 311         BT_DBG("hu %p wq awake device", hu);
 312
 313         /* Vote for serial clock */
 314         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
 315
 316         spin_lock(&qca->hci_ibs_lock);
 317
 318         /* Send wake indication to device */
 319         if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
 320                 BT_ERR("Failed to send WAKE to device");
 321
 322         qca->ibs_sent_wakes++;
 323
 324         /* Start retransmit timer */
 325         retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 326         mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 327
 328         spin_unlock(&qca->hci_ibs_lock);
 329
 330         /* Actually send the packets */
 331         hci_uart_tx_wakeup(hu);
 332 }
 333
 334 static void qca_wq_awake_rx(struct work_struct *work)
 335 {
 336         struct qca_data *qca = container_of(work, struct qca_data,
 337                                             ws_awake_rx);
 338         struct hci_uart *hu = qca->hu;
 339
 340         BT_DBG("hu %p wq awake rx", hu);
 341
 342         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
 343
 344         spin_lock(&qca->hci_ibs_lock);
 345         qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
 346
 347         /* Always acknowledge device wake up,
 348          * sending IBS message doesn't count as TX ON.
 349          */
 350         if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
 351                 BT_ERR("Failed to acknowledge device wake up");
 352
 353         qca->ibs_sent_wacks++;
 354
 355         spin_unlock(&qca->hci_ibs_lock);
 356
 357         /* Actually send the packets */
 358         hci_uart_tx_wakeup(hu);
 359 }
 360
 361 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
 362 {
 363         struct qca_data *qca = container_of(work, struct qca_data,
 364                                             ws_rx_vote_off);
 365         struct hci_uart *hu = qca->hu;
 366
 367         BT_DBG("hu %p rx clock vote off", hu);
 368
 369         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
 370 }
 371
 372 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
 373 {
 374         struct qca_data *qca = container_of(work, struct qca_data,
 375                                             ws_tx_vote_off);
 376         struct hci_uart *hu = qca->hu;
 377
 378         BT_DBG("hu %p tx clock vote off", hu);
 379
 380         /* Run HCI tx handling unlocked */
 381         hci_uart_tx_wakeup(hu);
 382
 383         /* Now that message queued to tty driver, vote for tty clocks off.
 384          * It is up to the tty driver to pend the clocks off until tx done.
 385          */
 386         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
 387 }
 388
 389 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 390 {
 391         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 392         struct hci_uart *hu = qca->hu;
 393         unsigned long flags;
 394
 395         BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
 396
 397         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 398                                  flags, SINGLE_DEPTH_NESTING);
 399
 400         switch (qca->tx_ibs_state) {
 401         case HCI_IBS_TX_AWAKE:
 402                 /* TX_IDLE, go to SLEEP */
 403                 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
 404                         BT_ERR("Failed to send SLEEP to device");
 405                         break;
 406                 }
 407                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 408                 qca->ibs_sent_slps++;
 409                 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
 410                 break;
 411
 412         case HCI_IBS_TX_ASLEEP:
 413         case HCI_IBS_TX_WAKING:
 414                 /* Fall through */
 415
 416         default:
 417                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 418                 break;
 419         }
 420
 421         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 422 }
 423
 424 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 425 {
 426         struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
 427         struct hci_uart *hu = qca->hu;
 428         unsigned long flags, retrans_delay;
 429         bool retransmit = false;
 430
 431         BT_DBG("hu %p wake retransmit timeout in %d state",
 432                 hu, qca->tx_ibs_state);
 433
 434         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 435                                  flags, SINGLE_DEPTH_NESTING);
 436
 437         switch (qca->tx_ibs_state) {
 438         case HCI_IBS_TX_WAKING:
 439                 /* No WAKE_ACK, retransmit WAKE */
 440                 retransmit = true;
 441                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
 442                         BT_ERR("Failed to acknowledge device wake up");
 443                         break;
 444                 }
 445                 qca->ibs_sent_wakes++;
 446                 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 447                 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 448                 break;
 449
 450         case HCI_IBS_TX_ASLEEP:
 451         case HCI_IBS_TX_AWAKE:
 452                 /* Fall through */
 453
 454         default:
 455                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 456                 break;
 457         }
 458
 459         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 460
 461         if (retransmit)
 462                 hci_uart_tx_wakeup(hu);
 463 }
 464
 465 /* Initialize protocol */
 466 static int qca_open(struct hci_uart *hu)
 467 {
 468         struct qca_serdev *qcadev;
 469         struct qca_data *qca;
 470         int ret;
 471
 472         BT_DBG("hu %p qca_open", hu);
 473
 474         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 475         if (!qca)
 476                 return -ENOMEM;
 477
 478         skb_queue_head_init(&qca->txq);
 479         skb_queue_head_init(&qca->tx_wait_q);
 480         spin_lock_init(&qca->hci_ibs_lock);
 481         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 482         if (!qca->workqueue) {
 483                 BT_ERR("QCA Workqueue not initialized properly");
 484                 kfree(qca);
 485                 return -ENOMEM;
 486         }
 487
 488         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 489         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 490         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 491         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 492
 493         qca->hu = hu;
 494
 495         /* Assume we start with both sides asleep -- extra wakes OK */
 496         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 497         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 498
 499         /* clocks actually on, but we start votes off */
 500         qca->tx_vote = false;
 501         qca->rx_vote = false;
 502         qca->flags = 0;
 503
 504         qca->ibs_sent_wacks = 0;
 505         qca->ibs_sent_slps = 0;
 506         qca->ibs_sent_wakes = 0;
 507         qca->ibs_recv_wacks = 0;
 508         qca->ibs_recv_slps = 0;
 509         qca->ibs_recv_wakes = 0;
 510         qca->vote_last_jif = jiffies;
 511         qca->vote_on_ms = 0;
 512         qca->vote_off_ms = 0;
 513         qca->votes_on = 0;
 514         qca->votes_off = 0;
 515         qca->tx_votes_on = 0;
 516         qca->tx_votes_off = 0;
 517         qca->rx_votes_on = 0;
 518         qca->rx_votes_off = 0;
 519
 520         hu->priv = qca;
 521
 522         if (hu->serdev) {
 523
 524                 qcadev = serdev_device_get_drvdata(hu->serdev);
 525                 if (!qca_is_wcn399x(qcadev->btsoc_type)) {
 526                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
 527                         /* Controller needs time to bootup. */
 528                         msleep(150);
 529                 } else {
 530                         hu->init_speed = qcadev->init_speed;
 531                         hu->oper_speed = qcadev->oper_speed;
 532                         ret = qca_power_setup(hu, true);
 533                         if (ret) {
 534                                 destroy_workqueue(qca->workqueue);
 535                                 kfree_skb(qca->rx_skb);
 536                                 hu->priv = NULL;
 537                                 kfree(qca);
 538                                 return ret;
 539                         }
 540                 }
 541         }
 542
 543         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 544         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 545
 546         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 547         qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
 548
 549         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 550                qca->tx_idle_delay, qca->wake_retrans);
 551
 552         return 0;
 553 }
 554
 555 static void qca_debugfs_init(struct hci_dev *hdev)
 556 {
 557         struct hci_uart *hu = hci_get_drvdata(hdev);
 558         struct qca_data *qca = hu->priv;
 559         struct dentry *ibs_dir;
 560         umode_t mode;
 561
 562         if (!hdev->debugfs)
 563                 return;
 564
 565         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 566
 567         /* read only */
 568         mode = S_IRUGO;
 569         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 570         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 571         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 572                            &qca->ibs_sent_slps);
 573         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 574                            &qca->ibs_sent_wakes);
 575         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 576                            &qca->ibs_sent_wacks);
 577         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 578                            &qca->ibs_recv_slps);
 579         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 580                            &qca->ibs_recv_wakes);
 581         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 582                            &qca->ibs_recv_wacks);
 583         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 584         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 585         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 586         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 587         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 588         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 589         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 590         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 591         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 592         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 593
 594         /* read/write */
 595         mode = S_IRUGO | S_IWUSR;
 596         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 597         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 598                            &qca->tx_idle_delay);
 599 }
 600
 601 /* Flush protocol data */
 602 static int qca_flush(struct hci_uart *hu)
 603 {
 604         struct qca_data *qca = hu->priv;
 605
 606         BT_DBG("hu %p qca flush", hu);
 607
 608         skb_queue_purge(&qca->tx_wait_q);
 609         skb_queue_purge(&qca->txq);
 610
 611         return 0;
 612 }
 613
 614 /* Close protocol */
 615 static int qca_close(struct hci_uart *hu)
 616 {
 617         struct qca_serdev *qcadev;
 618         struct qca_data *qca = hu->priv;
 619
 620         BT_DBG("hu %p qca close", hu);
 621
 622         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 623
 624         skb_queue_purge(&qca->tx_wait_q);
 625         skb_queue_purge(&qca->txq);
 626         del_timer(&qca->tx_idle_timer);
 627         del_timer(&qca->wake_retrans_timer);
 628         destroy_workqueue(qca->workqueue);
 629         qca->hu = NULL;
 630
 631         if (hu->serdev) {
 632                 qcadev = serdev_device_get_drvdata(hu->serdev);
 633                 if (qca_is_wcn399x(qcadev->btsoc_type))
 634                         qca_power_shutdown(hu);
 635                 else
 636                         gpiod_set_value_cansleep(qcadev->bt_en, 0);
 637
 638         }
 639
 640         kfree_skb(qca->rx_skb);
 641
 642         hu->priv = NULL;
 643
 644         kfree(qca);
 645
 646         return 0;
 647 }
 648
 649 /* Called upon a wake-up-indication from the device.
 650  */
 651 static void device_want_to_wakeup(struct hci_uart *hu)
 652 {
 653         unsigned long flags;
 654         struct qca_data *qca = hu->priv;
 655
 656         BT_DBG("hu %p want to wake up", hu);
 657
 658         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 659
 660         qca->ibs_recv_wakes++;
 661
 662         switch (qca->rx_ibs_state) {
 663         case HCI_IBS_RX_ASLEEP:
 664                 /* Make sure clock is on - we may have turned clock off since
 665                  * receiving the wake up indicator awake rx clock.
 666                  */
 667                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 668                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 669                 return;
 670
 671         case HCI_IBS_RX_AWAKE:
 672                 /* Always acknowledge device wake up,
 673                  * sending IBS message doesn't count as TX ON.
 674                  */
 675                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 676                         BT_ERR("Failed to acknowledge device wake up");
 677                         break;
 678                 }
 679                 qca->ibs_sent_wacks++;
 680                 break;
 681
 682         default:
 683                 /* Any other state is illegal */
 684                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 685                        qca->rx_ibs_state);
 686                 break;
 687         }
 688
 689         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 690
 691         /* Actually send the packets */
 692         hci_uart_tx_wakeup(hu);
 693 }
 694
 695 /* Called upon a sleep-indication from the device.
 696  */
 697 static void device_want_to_sleep(struct hci_uart *hu)
 698 {
 699         unsigned long flags;
 700         struct qca_data *qca = hu->priv;
 701
 702         BT_DBG("hu %p want to sleep", hu);
 703
 704         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 705
 706         qca->ibs_recv_slps++;
 707
 708         switch (qca->rx_ibs_state) {
 709         case HCI_IBS_RX_AWAKE:
 710                 /* Update state */
 711                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 712                 /* Vote off rx clock under workqueue */
 713                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 714                 break;
 715
 716         case HCI_IBS_RX_ASLEEP:
 717                 /* Fall through */
 718
 719         default:
 720                 /* Any other state is illegal */
 721                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 722                        qca->rx_ibs_state);
 723                 break;
 724         }
 725
 726         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 727 }
 728
 729 /* Called upon wake-up-acknowledgement from the device
 730  */
 731 static void device_woke_up(struct hci_uart *hu)
 732 {
 733         unsigned long flags, idle_delay;
 734         struct qca_data *qca = hu->priv;
 735         struct sk_buff *skb = NULL;
 736
 737         BT_DBG("hu %p woke up", hu);
 738
 739         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 740
 741         qca->ibs_recv_wacks++;
 742
 743         switch (qca->tx_ibs_state) {
 744         case HCI_IBS_TX_AWAKE:
 745                 /* Expect one if we send 2 WAKEs */
 746                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 747                        qca->tx_ibs_state);
 748                 break;
 749
 750         case HCI_IBS_TX_WAKING:
 751                 /* Send pending packets */
 752                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 753                         skb_queue_tail(&qca->txq, skb);
 754
 755                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 756                 del_timer(&qca->wake_retrans_timer);
 757                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 758                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 759                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 760                 break;
 761
 762         case HCI_IBS_TX_ASLEEP:
 763                 /* Fall through */
 764
 765         default:
 766                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 767                        qca->tx_ibs_state);
 768                 break;
 769         }
 770
 771         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 772
 773         /* Actually send the packets */
 774         hci_uart_tx_wakeup(hu);
 775 }
 776
 777 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 778  * two simultaneous tasklets.
 779  */
 780 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 781 {
 782         unsigned long flags = 0, idle_delay;
 783         struct qca_data *qca = hu->priv;
 784
 785         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 786                qca->tx_ibs_state);
 787
 788         /* Prepend skb with frame type */
 789         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 790
 791         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 792
 793         /* Don't go to sleep in middle of patch download or
 794          * Out-Of-Band(GPIOs control) sleep is selected.
 795          */
 796         if (!test_bit(QCA_IBS_ENABLED, &qca->flags)) {
 797                 skb_queue_tail(&qca->txq, skb);
 798                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 799                 return 0;
 800         }
 801
 802         /* Act according to current state */
 803         switch (qca->tx_ibs_state) {
 804         case HCI_IBS_TX_AWAKE:
 805                 BT_DBG("Device awake, sending normally");
 806                 skb_queue_tail(&qca->txq, skb);
 807                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 808                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 809                 break;
 810
 811         case HCI_IBS_TX_ASLEEP:
 812                 BT_DBG("Device asleep, waking up and queueing packet");
 813                 /* Save packet for later */
 814                 skb_queue_tail(&qca->tx_wait_q, skb);
 815
 816                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 817                 /* Schedule a work queue to wake up device */
 818                 queue_work(qca->workqueue, &qca->ws_awake_device);
 819                 break;
 820
 821         case HCI_IBS_TX_WAKING:
 822                 BT_DBG("Device waking up, queueing packet");
 823                 /* Transient state; just keep packet for later */
 824                 skb_queue_tail(&qca->tx_wait_q, skb);
 825                 break;
 826
 827         default:
 828                 BT_ERR("Illegal tx state: %d (losing packet)",
 829                        qca->tx_ibs_state);
 830                 kfree_skb(skb);
 831                 break;
 832         }
 833
 834         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 835
 836         return 0;
 837 }
 838
 839 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 840 {
 841         struct hci_uart *hu = hci_get_drvdata(hdev);
 842
 843         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 844
 845         device_want_to_sleep(hu);
 846
 847         kfree_skb(skb);
 848         return 0;
 849 }
 850
 851 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 852 {
 853         struct hci_uart *hu = hci_get_drvdata(hdev);
 854
 855         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 856
 857         device_want_to_wakeup(hu);
 858
 859         kfree_skb(skb);
 860         return 0;
 861 }
 862
 863 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 864 {
 865         struct hci_uart *hu = hci_get_drvdata(hdev);
 866
 867         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 868
 869         device_woke_up(hu);
 870
 871         kfree_skb(skb);
 872         return 0;
 873 }
 874
 875 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 876 {
 877         /* We receive debug logs from chip as an ACL packets.
 878          * Instead of sending the data to ACL to decode the
 879          * received data, we are pushing them to the above layers
 880          * as a diagnostic packet.
 881          */
 882         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 883                 return hci_recv_diag(hdev, skb);
 884
 885         return hci_recv_frame(hdev, skb);
 886 }
 887
 888 #define QCA_IBS_SLEEP_IND_EVENT \
 889         .type = HCI_IBS_SLEEP_IND, \
 890         .hlen = 0, \
 891         .loff = 0, \
 892         .lsize = 0, \
 893         .maxlen = HCI_MAX_IBS_SIZE
 894
 895 #define QCA_IBS_WAKE_IND_EVENT \
 896         .type = HCI_IBS_WAKE_IND, \
 897         .hlen = 0, \
 898         .loff = 0, \
 899         .lsize = 0, \
 900         .maxlen = HCI_MAX_IBS_SIZE
 901
 902 #define QCA_IBS_WAKE_ACK_EVENT \
 903         .type = HCI_IBS_WAKE_ACK, \
 904         .hlen = 0, \
 905         .loff = 0, \
 906         .lsize = 0, \
 907         .maxlen = HCI_MAX_IBS_SIZE
 908
 909 static const struct h4_recv_pkt qca_recv_pkts[] = {
 910         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
 911         { H4_RECV_SCO,             .recv = hci_recv_frame    },
 912         { H4_RECV_EVENT,           .recv = hci_recv_frame    },
 913         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
 914         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
 915         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
 916 };
 917
 918 static int qca_recv(struct hci_uart *hu, const void *data, int count)
 919 {
 920         struct qca_data *qca = hu->priv;
 921
 922         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 923                 return -EUNATCH;
 924
 925         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
 926                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
 927         if (IS_ERR(qca->rx_skb)) {
 928                 int err = PTR_ERR(qca->rx_skb);
 929                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 930                 qca->rx_skb = NULL;
 931                 return err;
 932         }
 933
 934         return count;
 935 }
 936
 937 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
 938 {
 939         struct qca_data *qca = hu->priv;
 940
 941         return skb_dequeue(&qca->txq);
 942 }
 943
 944 static uint8_t qca_get_baudrate_value(int speed)
 945 {
 946         switch (speed) {
 947         case 9600:
 948                 return QCA_BAUDRATE_9600;
 949         case 19200:
 950                 return QCA_BAUDRATE_19200;
 951         case 38400:
 952                 return QCA_BAUDRATE_38400;
 953         case 57600:
 954                 return QCA_BAUDRATE_57600;
 955         case 115200:
 956                 return QCA_BAUDRATE_115200;
 957         case 230400:
 958                 return QCA_BAUDRATE_230400;
 959         case 460800:
 960                 return QCA_BAUDRATE_460800;
 961         case 500000:
 962                 return QCA_BAUDRATE_500000;
 963         case 921600:
 964                 return QCA_BAUDRATE_921600;
 965         case 1000000:
 966                 return QCA_BAUDRATE_1000000;
 967         case 2000000:
 968                 return QCA_BAUDRATE_2000000;
 969         case 3000000:
 970                 return QCA_BAUDRATE_3000000;
 971         case 3200000:
 972                 return QCA_BAUDRATE_3200000;
 973         case 3500000:
 974                 return QCA_BAUDRATE_3500000;
 975         default:
 976                 return QCA_BAUDRATE_115200;
 977         }
 978 }
 979
 980 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 981 {
 982         struct hci_uart *hu = hci_get_drvdata(hdev);
 983         struct qca_data *qca = hu->priv;
 984         struct sk_buff *skb;
 985         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
 986
 987         if (baudrate > QCA_BAUDRATE_3200000)
 988                 return -EINVAL;
 989
 990         cmd[4] = baudrate;
 991
 992         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
 993         if (!skb) {
 994                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
 995                 return -ENOMEM;
 996         }
 997
 998         /* Assign commands to change baudrate and packet type. */
 999         skb_put_data(skb, cmd, sizeof(cmd));
1000         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1001
1002         skb_queue_tail(&qca->txq, skb);
1003         hci_uart_tx_wakeup(hu);
1004
1005         /* Wait for the baudrate change request to be sent */
1006
1007         while (!skb_queue_empty(&qca->txq))
1008                 usleep_range(100, 200);
1009
1010         if (hu->serdev)
1011                 serdev_device_wait_until_sent(hu->serdev,
1012                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1013
1014         /* Give the controller time to process the request */
1015         if (qca_is_wcn399x(qca_soc_type(hu)))
1016                 msleep(10);
1017         else
1018                 msleep(300);
1019
1020         return 0;
1021 }
1022
1023 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1024 {
1025         if (hu->serdev)
1026                 serdev_device_set_baudrate(hu->serdev, speed);
1027         else
1028                 hci_uart_set_baudrate(hu, speed);
1029 }
1030
1031 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1032 {
1033         int ret;
1034         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1035         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1036
1037         /* These power pulses are single byte command which are sent
1038          * at required baudrate to wcn3990. On wcn3990, we have an external
1039          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1040          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1041          * and also we use the same power inputs to turn on and off for
1042          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1043          * we send a power on pulse at 115200 bps. This algorithm will help to
1044          * save power. Disabling hardware flow control is mandatory while
1045          * sending power pulses to SoC.
1046          */
1047         bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1048
1049         serdev_device_write_flush(hu->serdev);
1050         hci_uart_set_flow_control(hu, true);
1051         ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1052         if (ret < 0) {
1053                 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1054                 return ret;
1055         }
1056
1057         serdev_device_wait_until_sent(hu->serdev, timeout);
1058         hci_uart_set_flow_control(hu, false);
1059
1060         /* Give to controller time to boot/shutdown */
1061         if (on)
1062                 msleep(100);
1063         else
1064                 msleep(10);
1065
1066         return 0;
1067 }
1068
1069 static unsigned int qca_get_speed(struct hci_uart *hu,
1070                                   enum qca_speed_type speed_type)
1071 {
1072         unsigned int speed = 0;
1073
1074         if (speed_type == QCA_INIT_SPEED) {
1075                 if (hu->init_speed)
1076                         speed = hu->init_speed;
1077                 else if (hu->proto->init_speed)
1078                         speed = hu->proto->init_speed;
1079         } else {
1080                 if (hu->oper_speed)
1081                         speed = hu->oper_speed;
1082                 else if (hu->proto->oper_speed)
1083                         speed = hu->proto->oper_speed;
1084         }
1085
1086         return speed;
1087 }
1088
1089 static int qca_check_speeds(struct hci_uart *hu)
1090 {
1091         if (qca_is_wcn399x(qca_soc_type(hu))) {
1092                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1093                     !qca_get_speed(hu, QCA_OPER_SPEED))
1094                         return -EINVAL;
1095         } else {
1096                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1097                     !qca_get_speed(hu, QCA_OPER_SPEED))
1098                         return -EINVAL;
1099         }
1100
1101         return 0;
1102 }
1103
1104 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1105 {
1106         unsigned int speed, qca_baudrate;
1107         int ret = 0;
1108
1109         if (speed_type == QCA_INIT_SPEED) {
1110                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1111                 if (speed)
1112                         host_set_baudrate(hu, speed);
1113         } else {
1114                 enum qca_btsoc_type soc_type = qca_soc_type(hu);
1115
1116                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1117                 if (!speed)
1118                         return 0;
1119
1120                 /* Disable flow control for wcn3990 to deassert RTS while
1121                  * changing the baudrate of chip and host.
1122                  */
1123                 if (qca_is_wcn399x(soc_type))
1124                         hci_uart_set_flow_control(hu, true);
1125
1126                 qca_baudrate = qca_get_baudrate_value(speed);
1127                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1128                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1129                 if (ret)
1130                         goto error;
1131
1132                 host_set_baudrate(hu, speed);
1133
1134 error:
1135                 if (qca_is_wcn399x(soc_type))
1136                         hci_uart_set_flow_control(hu, false);
1137         }
1138
1139         return ret;
1140 }
1141
1142 static int qca_wcn3990_init(struct hci_uart *hu)
1143 {
1144         struct qca_serdev *qcadev;
1145         int ret;
1146
1147         /* Check for vregs status, may be hci down has turned
1148          * off the voltage regulator.
1149          */
1150         qcadev = serdev_device_get_drvdata(hu->serdev);
1151         if (!qcadev->bt_power->vregs_on) {
1152                 serdev_device_close(hu->serdev);
1153                 ret = qca_power_setup(hu, true);
1154                 if (ret)
1155                         return ret;
1156
1157                 ret = serdev_device_open(hu->serdev);
1158                 if (ret) {
1159                         bt_dev_err(hu->hdev, "failed to open port");
1160                         return ret;
1161                 }
1162         }
1163
1164         /* Forcefully enable wcn3990 to enter in to boot mode. */
1165         host_set_baudrate(hu, 2400);
1166         ret = qca_send_power_pulse(hu, false);
1167         if (ret)
1168                 return ret;
1169
1170         qca_set_speed(hu, QCA_INIT_SPEED);
1171         ret = qca_send_power_pulse(hu, true);
1172         if (ret)
1173                 return ret;
1174
1175         /* Now the device is in ready state to communicate with host.
1176          * To sync host with device we need to reopen port.
1177          * Without this, we will have RTS and CTS synchronization
1178          * issues.
1179          */
1180         serdev_device_close(hu->serdev);
1181         ret = serdev_device_open(hu->serdev);
1182         if (ret) {
1183                 bt_dev_err(hu->hdev, "failed to open port");
1184                 return ret;
1185         }
1186
1187         hci_uart_set_flow_control(hu, false);
1188
1189         return 0;
1190 }
1191
1192 static int qca_setup(struct hci_uart *hu)
1193 {
1194         struct hci_dev *hdev = hu->hdev;
1195         struct qca_data *qca = hu->priv;
1196         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1197         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1198         int ret;
1199         int soc_ver = 0;
1200
1201         ret = qca_check_speeds(hu);
1202         if (ret)
1203                 return ret;
1204
1205         /* Patch downloading has to be done without IBS mode */
1206         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1207
1208         if (qca_is_wcn399x(soc_type)) {
1209                 bt_dev_info(hdev, "setting up wcn3990");
1210
1211                 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute
1212                  * setup for every hci up.
1213                  */
1214                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1215                 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1216                 hu->hdev->shutdown = qca_power_off;
1217                 ret = qca_wcn3990_init(hu);
1218                 if (ret)
1219                         return ret;
1220
1221                 ret = qca_read_soc_version(hdev, &soc_ver);
1222                 if (ret)
1223                         return ret;
1224         } else {
1225                 bt_dev_info(hdev, "ROME setup");
1226                 qca_set_speed(hu, QCA_INIT_SPEED);
1227         }
1228
1229         /* Setup user speed if needed */
1230         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1231         if (speed) {
1232                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1233                 if (ret)
1234                         return ret;
1235
1236                 qca_baudrate = qca_get_baudrate_value(speed);
1237         }
1238
1239         if (!qca_is_wcn399x(soc_type)) {
1240                 /* Get QCA version information */
1241                 ret = qca_read_soc_version(hdev, &soc_ver);
1242                 if (ret)
1243                         return ret;
1244         }
1245
1246         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1247         /* Setup patch / NVM configurations */
1248         ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver);
1249         if (!ret) {
1250                 set_bit(QCA_IBS_ENABLED, &qca->flags);
1251                 qca_debugfs_init(hdev);
1252         } else if (ret == -ENOENT) {
1253                 /* No patch/nvm-config found, run with original fw/config */
1254                 ret = 0;
1255         } else if (ret == -EAGAIN) {
1256                 /*
1257                  * Userspace firmware loader will return -EAGAIN in case no
1258                  * patch/nvm-config is found, so run with original fw/config.
1259                  */
1260                 ret = 0;
1261         }
1262
1263         /* Setup bdaddr */
1264         if (qca_is_wcn399x(soc_type))
1265                 hu->hdev->set_bdaddr = qca_set_bdaddr;
1266         else
1267                 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1268
1269         return ret;
1270 }
1271
1272 static struct hci_uart_proto qca_proto = {
1273         .id             = HCI_UART_QCA,
1274         .name           = "QCA",
1275         .manufacturer   = 29,
1276         .init_speed     = 115200,
1277         .oper_speed     = 3000000,
1278         .open           = qca_open,
1279         .close          = qca_close,
1280         .flush          = qca_flush,
1281         .setup          = qca_setup,
1282         .recv           = qca_recv,
1283         .enqueue        = qca_enqueue,
1284         .dequeue        = qca_dequeue,
1285 };
1286
1287 static const struct qca_vreg_data qca_soc_data_wcn3990 = {
1288         .soc_type = QCA_WCN3990,
1289         .vregs = (struct qca_vreg []) {
1290                 { "vddio",   1800000, 1900000,  15000  },
1291                 { "vddxo",   1800000, 1900000,  80000  },
1292                 { "vddrf",   1300000, 1350000,  300000 },
1293                 { "vddch0",  3300000, 3400000,  450000 },
1294         },
1295         .num_vregs = 4,
1296 };
1297
1298 static const struct qca_vreg_data qca_soc_data_wcn3998 = {
1299         .soc_type = QCA_WCN3998,
1300         .vregs = (struct qca_vreg []) {
1301                 { "vddio",   1800000, 1900000,  10000  },
1302                 { "vddxo",   1800000, 1900000,  80000  },
1303                 { "vddrf",   1300000, 1352000,  300000 },
1304                 { "vddch0",  3300000, 3300000,  450000 },
1305         },
1306         .num_vregs = 4,
1307 };
1308
1309 static void qca_power_shutdown(struct hci_uart *hu)
1310 {
1311         struct qca_data *qca = hu->priv;
1312         unsigned long flags;
1313
1314         /* From this point we go into power off state. But serial port is
1315          * still open, stop queueing the IBS data and flush all the buffered
1316          * data in skb's.
1317          */
1318         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1319         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1320         qca_flush(hu);
1321         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1322
1323         host_set_baudrate(hu, 2400);
1324         qca_send_power_pulse(hu, false);
1325         qca_power_setup(hu, false);
1326 }
1327
1328 static int qca_power_off(struct hci_dev *hdev)
1329 {
1330         struct hci_uart *hu = hci_get_drvdata(hdev);
1331
1332         qca_power_shutdown(hu);
1333         return 0;
1334 }
1335
1336 static int qca_enable_regulator(struct qca_vreg vregs,
1337                                 struct regulator *regulator)
1338 {
1339         int ret;
1340
1341         ret = regulator_set_voltage(regulator, vregs.min_uV,
1342                                     vregs.max_uV);
1343         if (ret)
1344                 return ret;
1345
1346         if (vregs.load_uA)
1347                 ret = regulator_set_load(regulator,
1348                                          vregs.load_uA);
1349
1350         if (ret)
1351                 return ret;
1352
1353         return regulator_enable(regulator);
1354
1355 }
1356
1357 static void qca_disable_regulator(struct qca_vreg vregs,
1358                                   struct regulator *regulator)
1359 {
1360         regulator_disable(regulator);
1361         regulator_set_voltage(regulator, 0, vregs.max_uV);
1362         if (vregs.load_uA)
1363                 regulator_set_load(regulator, 0);
1364
1365 }
1366
1367 static int qca_power_setup(struct hci_uart *hu, bool on)
1368 {
1369         struct qca_vreg *vregs;
1370         struct regulator_bulk_data *vreg_bulk;
1371         struct qca_serdev *qcadev;
1372         int i, num_vregs, ret = 0;
1373
1374         qcadev = serdev_device_get_drvdata(hu->serdev);
1375         if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1376             !qcadev->bt_power->vreg_bulk)
1377                 return -EINVAL;
1378
1379         vregs = qcadev->bt_power->vreg_data->vregs;
1380         vreg_bulk = qcadev->bt_power->vreg_bulk;
1381         num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1382         BT_DBG("on: %d", on);
1383         if (on && !qcadev->bt_power->vregs_on) {
1384                 for (i = 0; i < num_vregs; i++) {
1385                         ret = qca_enable_regulator(vregs[i],
1386                                                    vreg_bulk[i].consumer);
1387                         if (ret)
1388                                 break;
1389                 }
1390
1391                 if (ret) {
1392                         BT_ERR("failed to enable regulator:%s", vregs[i].name);
1393                         /* turn off regulators which are enabled */
1394                         for (i = i - 1; i >= 0; i--)
1395                                 qca_disable_regulator(vregs[i],
1396                                                       vreg_bulk[i].consumer);
1397                 } else {
1398                         qcadev->bt_power->vregs_on = true;
1399                 }
1400         } else if (!on && qcadev->bt_power->vregs_on) {
1401                 /* turn off regulator in reverse order */
1402                 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1403                 for ( ; i >= 0; i--)
1404                         qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1405
1406                 qcadev->bt_power->vregs_on = false;
1407         }
1408
1409         return ret;
1410 }
1411
1412 static int qca_init_regulators(struct qca_power *qca,
1413                                 const struct qca_vreg *vregs, size_t num_vregs)
1414 {
1415         int i;
1416
1417         qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs,
1418                                       sizeof(struct regulator_bulk_data),
1419                                       GFP_KERNEL);
1420         if (!qca->vreg_bulk)
1421                 return -ENOMEM;
1422
1423         for (i = 0; i < num_vregs; i++)
1424                 qca->vreg_bulk[i].supply = vregs[i].name;
1425
1426         return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1427 }
1428
1429 static int qca_serdev_probe(struct serdev_device *serdev)
1430 {
1431         struct qca_serdev *qcadev;
1432         const struct qca_vreg_data *data;
1433         int err;
1434
1435         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1436         if (!qcadev)
1437                 return -ENOMEM;
1438
1439         qcadev->serdev_hu.serdev = serdev;
1440         data = of_device_get_match_data(&serdev->dev);
1441         serdev_device_set_drvdata(serdev, qcadev);
1442         if (data && qca_is_wcn399x(data->soc_type)) {
1443                 qcadev->btsoc_type = data->soc_type;
1444                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1445                                                 sizeof(struct qca_power),
1446                                                 GFP_KERNEL);
1447                 if (!qcadev->bt_power)
1448                         return -ENOMEM;
1449
1450                 qcadev->bt_power->dev = &serdev->dev;
1451                 qcadev->bt_power->vreg_data = data;
1452                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1453                                           data->num_vregs);
1454                 if (err) {
1455                         BT_ERR("Failed to init regulators:%d", err);
1456                         goto out;
1457                 }
1458
1459                 qcadev->bt_power->vregs_on = false;
1460
1461                 device_property_read_u32(&serdev->dev, "max-speed",
1462                                          &qcadev->oper_speed);
1463                 if (!qcadev->oper_speed)
1464                         BT_DBG("UART will pick default operating speed");
1465
1466                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1467                 if (err) {
1468                         BT_ERR("wcn3990 serdev registration failed");
1469                         goto out;
1470                 }
1471         } else {
1472                 qcadev->btsoc_type = QCA_ROME;
1473                 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1474                                                GPIOD_OUT_LOW);
1475                 if (IS_ERR(qcadev->bt_en)) {
1476                         dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1477                         return PTR_ERR(qcadev->bt_en);
1478                 }
1479
1480                 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1481                 if (IS_ERR(qcadev->susclk)) {
1482                         dev_err(&serdev->dev, "failed to acquire clk\n");
1483                         return PTR_ERR(qcadev->susclk);
1484                 }
1485
1486                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1487                 if (err)
1488                         return err;
1489
1490                 err = clk_prepare_enable(qcadev->susclk);
1491                 if (err)
1492                         return err;
1493
1494                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1495                 if (err)
1496                         clk_disable_unprepare(qcadev->susclk);
1497         }
1498
1499 out:    return err;
1500
1501 }
1502
1503 static void qca_serdev_remove(struct serdev_device *serdev)
1504 {
1505         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1506
1507         if (qca_is_wcn399x(qcadev->btsoc_type))
1508                 qca_power_shutdown(&qcadev->serdev_hu);
1509         else
1510                 clk_disable_unprepare(qcadev->susclk);
1511
1512         hci_uart_unregister_device(&qcadev->serdev_hu);
1513 }
1514
1515 static const struct of_device_id qca_bluetooth_of_match[] = {
1516         { .compatible = "qcom,qca6174-bt" },
1517         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
1518         { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
1519         { /* sentinel */ }
1520 };
1521 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1522
1523 static struct serdev_device_driver qca_serdev_driver = {
1524         .probe = qca_serdev_probe,
1525         .remove = qca_serdev_remove,
1526         .driver = {
1527                 .name = "hci_uart_qca",
1528                 .of_match_table = qca_bluetooth_of_match,
1529         },
1530 };
1531
1532 int __init qca_init(void)
1533 {
1534         serdev_device_driver_register(&qca_serdev_driver);
1535
1536         return hci_uart_register_proto(&qca_proto);
1537 }
1538
1539 int __exit qca_deinit(void)
1540 {
1541         serdev_device_driver_unregister(&qca_serdev_driver);
1542
1543         return hci_uart_unregister_proto(&qca_proto);
1544 }