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