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_uart *hu);
 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         if (!hci_uart_has_flow_control(hu))
 454                 return -EOPNOTSUPP;
 455
 456         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 457         if (!qca)
 458                 return -ENOMEM;
 459
 460         skb_queue_head_init(&qca->txq);
 461         skb_queue_head_init(&qca->tx_wait_q);
 462         spin_lock_init(&qca->hci_ibs_lock);
 463         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 464         if (!qca->workqueue) {
 465                 BT_ERR("QCA Workqueue not initialized properly");
 466                 kfree(qca);
 467                 return -ENOMEM;
 468         }
 469
 470         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 471         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 472         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 473         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 474
 475         qca->hu = hu;
 476
 477         /* Assume we start with both sides asleep -- extra wakes OK */
 478         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 479         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 480
 481         /* clocks actually on, but we start votes off */
 482         qca->tx_vote = false;
 483         qca->rx_vote = false;
 484         qca->flags = 0;
 485
 486         qca->ibs_sent_wacks = 0;
 487         qca->ibs_sent_slps = 0;
 488         qca->ibs_sent_wakes = 0;
 489         qca->ibs_recv_wacks = 0;
 490         qca->ibs_recv_slps = 0;
 491         qca->ibs_recv_wakes = 0;
 492         qca->vote_last_jif = jiffies;
 493         qca->vote_on_ms = 0;
 494         qca->vote_off_ms = 0;
 495         qca->votes_on = 0;
 496         qca->votes_off = 0;
 497         qca->tx_votes_on = 0;
 498         qca->tx_votes_off = 0;
 499         qca->rx_votes_on = 0;
 500         qca->rx_votes_off = 0;
 501
 502         hu->priv = qca;
 503
 504         if (hu->serdev) {
 505                 serdev_device_open(hu->serdev);
 506
 507                 qcadev = serdev_device_get_drvdata(hu->serdev);
 508                 if (qcadev->btsoc_type != QCA_WCN3990) {
 509                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
 510                         /* Controller needs time to bootup. */
 511                         msleep(150);
 512                 } else {
 513                         hu->init_speed = qcadev->init_speed;
 514                         hu->oper_speed = qcadev->oper_speed;
 515                         ret = qca_power_setup(hu, true);
 516                         if (ret) {
 517                                 destroy_workqueue(qca->workqueue);
 518                                 kfree_skb(qca->rx_skb);
 519                                 hu->priv = NULL;
 520                                 kfree(qca);
 521                                 return ret;
 522                         }
 523                 }
 524         }
 525
 526         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 527         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 528
 529         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 530         qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
 531
 532         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 533                qca->tx_idle_delay, qca->wake_retrans);
 534
 535         return 0;
 536 }
 537
 538 static void qca_debugfs_init(struct hci_dev *hdev)
 539 {
 540         struct hci_uart *hu = hci_get_drvdata(hdev);
 541         struct qca_data *qca = hu->priv;
 542         struct dentry *ibs_dir;
 543         umode_t mode;
 544
 545         if (!hdev->debugfs)
 546                 return;
 547
 548         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 549
 550         /* read only */
 551         mode = S_IRUGO;
 552         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 553         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 554         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 555                            &qca->ibs_sent_slps);
 556         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 557                            &qca->ibs_sent_wakes);
 558         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 559                            &qca->ibs_sent_wacks);
 560         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 561                            &qca->ibs_recv_slps);
 562         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 563                            &qca->ibs_recv_wakes);
 564         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 565                            &qca->ibs_recv_wacks);
 566         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 567         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 568         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 569         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 570         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 571         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 572         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 573         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 574         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 575         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 576
 577         /* read/write */
 578         mode = S_IRUGO | S_IWUSR;
 579         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 580         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 581                            &qca->tx_idle_delay);
 582 }
 583
 584 /* Flush protocol data */
 585 static int qca_flush(struct hci_uart *hu)
 586 {
 587         struct qca_data *qca = hu->priv;
 588
 589         BT_DBG("hu %p qca flush", hu);
 590
 591         skb_queue_purge(&qca->tx_wait_q);
 592         skb_queue_purge(&qca->txq);
 593
 594         return 0;
 595 }
 596
 597 /* Close protocol */
 598 static int qca_close(struct hci_uart *hu)
 599 {
 600         struct qca_serdev *qcadev;
 601         struct qca_data *qca = hu->priv;
 602
 603         BT_DBG("hu %p qca close", hu);
 604
 605         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 606
 607         skb_queue_purge(&qca->tx_wait_q);
 608         skb_queue_purge(&qca->txq);
 609         del_timer(&qca->tx_idle_timer);
 610         del_timer(&qca->wake_retrans_timer);
 611         destroy_workqueue(qca->workqueue);
 612         qca->hu = NULL;
 613
 614         if (hu->serdev) {
 615                 qcadev = serdev_device_get_drvdata(hu->serdev);
 616                 if (qcadev->btsoc_type == QCA_WCN3990)
 617                         qca_power_shutdown(hu);
 618                 else
 619                         gpiod_set_value_cansleep(qcadev->bt_en, 0);
 620
 621                 serdev_device_close(hu->serdev);
 622         }
 623
 624         kfree_skb(qca->rx_skb);
 625
 626         hu->priv = NULL;
 627
 628         kfree(qca);
 629
 630         return 0;
 631 }
 632
 633 /* Called upon a wake-up-indication from the device.
 634  */
 635 static void device_want_to_wakeup(struct hci_uart *hu)
 636 {
 637         unsigned long flags;
 638         struct qca_data *qca = hu->priv;
 639
 640         BT_DBG("hu %p want to wake up", hu);
 641
 642         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 643
 644         qca->ibs_recv_wakes++;
 645
 646         switch (qca->rx_ibs_state) {
 647         case HCI_IBS_RX_ASLEEP:
 648                 /* Make sure clock is on - we may have turned clock off since
 649                  * receiving the wake up indicator awake rx clock.
 650                  */
 651                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 652                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 653                 return;
 654
 655         case HCI_IBS_RX_AWAKE:
 656                 /* Always acknowledge device wake up,
 657                  * sending IBS message doesn't count as TX ON.
 658                  */
 659                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 660                         BT_ERR("Failed to acknowledge device wake up");
 661                         break;
 662                 }
 663                 qca->ibs_sent_wacks++;
 664                 break;
 665
 666         default:
 667                 /* Any other state is illegal */
 668                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 669                        qca->rx_ibs_state);
 670                 break;
 671         }
 672
 673         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 674
 675         /* Actually send the packets */
 676         hci_uart_tx_wakeup(hu);
 677 }
 678
 679 /* Called upon a sleep-indication from the device.
 680  */
 681 static void device_want_to_sleep(struct hci_uart *hu)
 682 {
 683         unsigned long flags;
 684         struct qca_data *qca = hu->priv;
 685
 686         BT_DBG("hu %p want to sleep", hu);
 687
 688         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 689
 690         qca->ibs_recv_slps++;
 691
 692         switch (qca->rx_ibs_state) {
 693         case HCI_IBS_RX_AWAKE:
 694                 /* Update state */
 695                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 696                 /* Vote off rx clock under workqueue */
 697                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 698                 break;
 699
 700         case HCI_IBS_RX_ASLEEP:
 701                 /* Fall through */
 702
 703         default:
 704                 /* Any other state is illegal */
 705                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 706                        qca->rx_ibs_state);
 707                 break;
 708         }
 709
 710         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 711 }
 712
 713 /* Called upon wake-up-acknowledgement from the device
 714  */
 715 static void device_woke_up(struct hci_uart *hu)
 716 {
 717         unsigned long flags, idle_delay;
 718         struct qca_data *qca = hu->priv;
 719         struct sk_buff *skb = NULL;
 720
 721         BT_DBG("hu %p woke up", hu);
 722
 723         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 724
 725         qca->ibs_recv_wacks++;
 726
 727         switch (qca->tx_ibs_state) {
 728         case HCI_IBS_TX_AWAKE:
 729                 /* Expect one if we send 2 WAKEs */
 730                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 731                        qca->tx_ibs_state);
 732                 break;
 733
 734         case HCI_IBS_TX_WAKING:
 735                 /* Send pending packets */
 736                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 737                         skb_queue_tail(&qca->txq, skb);
 738
 739                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 740                 del_timer(&qca->wake_retrans_timer);
 741                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 742                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 743                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 744                 break;
 745
 746         case HCI_IBS_TX_ASLEEP:
 747                 /* Fall through */
 748
 749         default:
 750                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 751                        qca->tx_ibs_state);
 752                 break;
 753         }
 754
 755         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 756
 757         /* Actually send the packets */
 758         hci_uart_tx_wakeup(hu);
 759 }
 760
 761 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 762  * two simultaneous tasklets.
 763  */
 764 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 765 {
 766         unsigned long flags = 0, idle_delay;
 767         struct qca_data *qca = hu->priv;
 768
 769         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 770                qca->tx_ibs_state);
 771
 772         /* Prepend skb with frame type */
 773         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 774
 775         /* Don't go to sleep in middle of patch download or
 776          * Out-Of-Band(GPIOs control) sleep is selected.
 777          */
 778         if (!test_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags)) {
 779                 skb_queue_tail(&qca->txq, skb);
 780                 return 0;
 781         }
 782
 783         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 784
 785         /* Act according to current state */
 786         switch (qca->tx_ibs_state) {
 787         case HCI_IBS_TX_AWAKE:
 788                 BT_DBG("Device awake, sending normally");
 789                 skb_queue_tail(&qca->txq, skb);
 790                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 791                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 792                 break;
 793
 794         case HCI_IBS_TX_ASLEEP:
 795                 BT_DBG("Device asleep, waking up and queueing packet");
 796                 /* Save packet for later */
 797                 skb_queue_tail(&qca->tx_wait_q, skb);
 798
 799                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 800                 /* Schedule a work queue to wake up device */
 801                 queue_work(qca->workqueue, &qca->ws_awake_device);
 802                 break;
 803
 804         case HCI_IBS_TX_WAKING:
 805                 BT_DBG("Device waking up, queueing packet");
 806                 /* Transient state; just keep packet for later */
 807                 skb_queue_tail(&qca->tx_wait_q, skb);
 808                 break;
 809
 810         default:
 811                 BT_ERR("Illegal tx state: %d (losing packet)",
 812                        qca->tx_ibs_state);
 813                 kfree_skb(skb);
 814                 break;
 815         }
 816
 817         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 818
 819         return 0;
 820 }
 821
 822 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 823 {
 824         struct hci_uart *hu = hci_get_drvdata(hdev);
 825
 826         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 827
 828         device_want_to_sleep(hu);
 829
 830         kfree_skb(skb);
 831         return 0;
 832 }
 833
 834 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 835 {
 836         struct hci_uart *hu = hci_get_drvdata(hdev);
 837
 838         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 839
 840         device_want_to_wakeup(hu);
 841
 842         kfree_skb(skb);
 843         return 0;
 844 }
 845
 846 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 847 {
 848         struct hci_uart *hu = hci_get_drvdata(hdev);
 849
 850         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 851
 852         device_woke_up(hu);
 853
 854         kfree_skb(skb);
 855         return 0;
 856 }
 857
 858 #define QCA_IBS_SLEEP_IND_EVENT \
 859         .type = HCI_IBS_SLEEP_IND, \
 860         .hlen = 0, \
 861         .loff = 0, \
 862         .lsize = 0, \
 863         .maxlen = HCI_MAX_IBS_SIZE
 864
 865 #define QCA_IBS_WAKE_IND_EVENT \
 866         .type = HCI_IBS_WAKE_IND, \
 867         .hlen = 0, \
 868         .loff = 0, \
 869         .lsize = 0, \
 870         .maxlen = HCI_MAX_IBS_SIZE
 871
 872 #define QCA_IBS_WAKE_ACK_EVENT \
 873         .type = HCI_IBS_WAKE_ACK, \
 874         .hlen = 0, \
 875         .loff = 0, \
 876         .lsize = 0, \
 877         .maxlen = HCI_MAX_IBS_SIZE
 878
 879 static const struct h4_recv_pkt qca_recv_pkts[] = {
 880         { H4_RECV_ACL,             .recv = hci_recv_frame    },
 881         { H4_RECV_SCO,             .recv = hci_recv_frame    },
 882         { H4_RECV_EVENT,           .recv = hci_recv_frame    },
 883         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
 884         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
 885         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
 886 };
 887
 888 static int qca_recv(struct hci_uart *hu, const void *data, int count)
 889 {
 890         struct qca_data *qca = hu->priv;
 891
 892         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 893                 return -EUNATCH;
 894
 895         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
 896                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
 897         if (IS_ERR(qca->rx_skb)) {
 898                 int err = PTR_ERR(qca->rx_skb);
 899                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 900                 qca->rx_skb = NULL;
 901                 return err;
 902         }
 903
 904         return count;
 905 }
 906
 907 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
 908 {
 909         struct qca_data *qca = hu->priv;
 910
 911         return skb_dequeue(&qca->txq);
 912 }
 913
 914 static uint8_t qca_get_baudrate_value(int speed)
 915 {
 916         switch (speed) {
 917         case 9600:
 918                 return QCA_BAUDRATE_9600;
 919         case 19200:
 920                 return QCA_BAUDRATE_19200;
 921         case 38400:
 922                 return QCA_BAUDRATE_38400;
 923         case 57600:
 924                 return QCA_BAUDRATE_57600;
 925         case 115200:
 926                 return QCA_BAUDRATE_115200;
 927         case 230400:
 928                 return QCA_BAUDRATE_230400;
 929         case 460800:
 930                 return QCA_BAUDRATE_460800;
 931         case 500000:
 932                 return QCA_BAUDRATE_500000;
 933         case 921600:
 934                 return QCA_BAUDRATE_921600;
 935         case 1000000:
 936                 return QCA_BAUDRATE_1000000;
 937         case 2000000:
 938                 return QCA_BAUDRATE_2000000;
 939         case 3000000:
 940                 return QCA_BAUDRATE_3000000;
 941         case 3200000:
 942                 return QCA_BAUDRATE_3200000;
 943         case 3500000:
 944                 return QCA_BAUDRATE_3500000;
 945         default:
 946                 return QCA_BAUDRATE_115200;
 947         }
 948 }
 949
 950 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 951 {
 952         struct hci_uart *hu = hci_get_drvdata(hdev);
 953         struct qca_data *qca = hu->priv;
 954         struct sk_buff *skb;
 955         struct qca_serdev *qcadev;
 956         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
 957
 958         if (baudrate > QCA_BAUDRATE_3200000)
 959                 return -EINVAL;
 960
 961         cmd[4] = baudrate;
 962
 963         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
 964         if (!skb) {
 965                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
 966                 return -ENOMEM;
 967         }
 968
 969         /* Disabling hardware flow control is mandatory while
 970          * sending change baudrate request to wcn3990 SoC.
 971          */
 972         qcadev = serdev_device_get_drvdata(hu->serdev);
 973         if (qcadev->btsoc_type == QCA_WCN3990)
 974                 hci_uart_set_flow_control(hu, true);
 975
 976         /* Assign commands to change baudrate and packet type. */
 977         skb_put_data(skb, cmd, sizeof(cmd));
 978         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
 979
 980         skb_queue_tail(&qca->txq, skb);
 981         hci_uart_tx_wakeup(hu);
 982
 983         /* wait 300ms to change new baudrate on controller side
 984          * controller will come back after they receive this HCI command
 985          * then host can communicate with new baudrate to controller
 986          */
 987         set_current_state(TASK_UNINTERRUPTIBLE);
 988         schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS));
 989         set_current_state(TASK_RUNNING);
 990
 991         if (qcadev->btsoc_type == QCA_WCN3990)
 992                 hci_uart_set_flow_control(hu, false);
 993
 994         return 0;
 995 }
 996
 997 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
 998 {
 999         if (hu->serdev)
1000                 serdev_device_set_baudrate(hu->serdev, speed);
1001         else
1002                 hci_uart_set_baudrate(hu, speed);
1003 }
1004
1005 static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd)
1006 {
1007         struct hci_uart *hu = hci_get_drvdata(hdev);
1008         struct qca_data *qca = hu->priv;
1009         struct sk_buff *skb;
1010
1011         /* These power pulses are single byte command which are sent
1012          * at required baudrate to wcn3990. On wcn3990, we have an external
1013          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1014          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1015          * and also we use the same power inputs to turn on and off for
1016          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1017          * we send a power on pulse at 115200 bps. This algorithm will help to
1018          * save power. Disabling hardware flow control is mandatory while
1019          * sending power pulses to SoC.
1020          */
1021         bt_dev_dbg(hdev, "sending power pulse %02x to SoC", cmd);
1022
1023         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1024         if (!skb)
1025                 return -ENOMEM;
1026
1027         hci_uart_set_flow_control(hu, true);
1028
1029         skb_put_u8(skb, cmd);
1030         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1031
1032         skb_queue_tail(&qca->txq, skb);
1033         hci_uart_tx_wakeup(hu);
1034
1035         /* Wait for 100 uS for SoC to settle down */
1036         usleep_range(100, 200);
1037         hci_uart_set_flow_control(hu, false);
1038
1039         return 0;
1040 }
1041
1042 static unsigned int qca_get_speed(struct hci_uart *hu,
1043                                   enum qca_speed_type speed_type)
1044 {
1045         unsigned int speed = 0;
1046
1047         if (speed_type == QCA_INIT_SPEED) {
1048                 if (hu->init_speed)
1049                         speed = hu->init_speed;
1050                 else if (hu->proto->init_speed)
1051                         speed = hu->proto->init_speed;
1052         } else {
1053                 if (hu->oper_speed)
1054                         speed = hu->oper_speed;
1055                 else if (hu->proto->oper_speed)
1056                         speed = hu->proto->oper_speed;
1057         }
1058
1059         return speed;
1060 }
1061
1062 static int qca_check_speeds(struct hci_uart *hu)
1063 {
1064         struct qca_serdev *qcadev;
1065
1066         qcadev = serdev_device_get_drvdata(hu->serdev);
1067         if (qcadev->btsoc_type == QCA_WCN3990) {
1068                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1069                     !qca_get_speed(hu, QCA_OPER_SPEED))
1070                         return -EINVAL;
1071         } else {
1072                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1073                     !qca_get_speed(hu, QCA_OPER_SPEED))
1074                         return -EINVAL;
1075         }
1076
1077         return 0;
1078 }
1079
1080 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1081 {
1082         unsigned int speed, qca_baudrate;
1083         int ret;
1084
1085         if (speed_type == QCA_INIT_SPEED) {
1086                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1087                 if (speed)
1088                         host_set_baudrate(hu, speed);
1089         } else {
1090                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1091                 if (!speed)
1092                         return 0;
1093
1094                 qca_baudrate = qca_get_baudrate_value(speed);
1095                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1096                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1097                 if (ret)
1098                         return ret;
1099
1100                 host_set_baudrate(hu, speed);
1101         }
1102
1103         return 0;
1104 }
1105
1106 static int qca_wcn3990_init(struct hci_uart *hu)
1107 {
1108         struct hci_dev *hdev = hu->hdev;
1109         int ret;
1110
1111         /* Forcefully enable wcn3990 to enter in to boot mode. */
1112         host_set_baudrate(hu, 2400);
1113         ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE);
1114         if (ret)
1115                 return ret;
1116
1117         qca_set_speed(hu, QCA_INIT_SPEED);
1118         ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWERON_PULSE);
1119         if (ret)
1120                 return ret;
1121
1122         /* Wait for 100 ms for SoC to boot */
1123         msleep(100);
1124
1125         /* Now the device is in ready state to communicate with host.
1126          * To sync host with device we need to reopen port.
1127          * Without this, we will have RTS and CTS synchronization
1128          * issues.
1129          */
1130         serdev_device_close(hu->serdev);
1131         ret = serdev_device_open(hu->serdev);
1132         if (ret) {
1133                 bt_dev_err(hu->hdev, "failed to open port");
1134                 return ret;
1135         }
1136
1137         hci_uart_set_flow_control(hu, false);
1138
1139         return 0;
1140 }
1141
1142 static int qca_setup(struct hci_uart *hu)
1143 {
1144         struct hci_dev *hdev = hu->hdev;
1145         struct qca_data *qca = hu->priv;
1146         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1147         struct qca_serdev *qcadev;
1148         int ret;
1149         int soc_ver = 0;
1150
1151         qcadev = serdev_device_get_drvdata(hu->serdev);
1152
1153         ret = qca_check_speeds(hu);
1154         if (ret)
1155                 return ret;
1156
1157         /* Patch downloading has to be done without IBS mode */
1158         clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1159
1160         if (qcadev->btsoc_type == QCA_WCN3990) {
1161                 bt_dev_info(hdev, "setting up wcn3990");
1162                 ret = qca_wcn3990_init(hu);
1163                 if (ret)
1164                         return ret;
1165
1166                 ret = qca_read_soc_version(hdev, &soc_ver);
1167                 if (ret)
1168                         return ret;
1169         } else {
1170                 bt_dev_info(hdev, "ROME setup");
1171                 qca_set_speed(hu, QCA_INIT_SPEED);
1172         }
1173
1174         /* Setup user speed if needed */
1175         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1176         if (speed) {
1177                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1178                 if (ret)
1179                         return ret;
1180
1181                 qca_baudrate = qca_get_baudrate_value(speed);
1182         }
1183
1184         if (qcadev->btsoc_type != QCA_WCN3990) {
1185                 /* Get QCA version information */
1186                 ret = qca_read_soc_version(hdev, &soc_ver);
1187                 if (ret)
1188                         return ret;
1189         }
1190
1191         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1192         /* Setup patch / NVM configurations */
1193         ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver);
1194         if (!ret) {
1195                 set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1196                 qca_debugfs_init(hdev);
1197         } else if (ret == -ENOENT) {
1198                 /* No patch/nvm-config found, run with original fw/config */
1199                 ret = 0;
1200         } else if (ret == -EAGAIN) {
1201                 /*
1202                  * Userspace firmware loader will return -EAGAIN in case no
1203                  * patch/nvm-config is found, so run with original fw/config.
1204                  */
1205                 ret = 0;
1206         }
1207
1208         /* Setup bdaddr */
1209         hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1210
1211         return ret;
1212 }
1213
1214 static struct hci_uart_proto qca_proto = {
1215         .id             = HCI_UART_QCA,
1216         .name           = "QCA",
1217         .manufacturer   = 29,
1218         .init_speed     = 115200,
1219         .oper_speed     = 3000000,
1220         .open           = qca_open,
1221         .close          = qca_close,
1222         .flush          = qca_flush,
1223         .setup          = qca_setup,
1224         .recv           = qca_recv,
1225         .enqueue        = qca_enqueue,
1226         .dequeue        = qca_dequeue,
1227 };
1228
1229 static const struct qca_vreg_data qca_soc_data = {
1230         .soc_type = QCA_WCN3990,
1231         .vregs = (struct qca_vreg []) {
1232                 { "vddio",   1800000, 1900000,  15000  },
1233                 { "vddxo",   1800000, 1900000,  80000  },
1234                 { "vddrf",   1300000, 1350000,  300000 },
1235                 { "vddch0",  3300000, 3400000,  450000 },
1236         },
1237         .num_vregs = 4,
1238 };
1239
1240 static void qca_power_shutdown(struct hci_uart *hu)
1241 {
1242         struct serdev_device *serdev = hu->serdev;
1243         unsigned char cmd = QCA_WCN3990_POWEROFF_PULSE;
1244
1245         host_set_baudrate(hu, 2400);
1246         hci_uart_set_flow_control(hu, true);
1247         serdev_device_write_buf(serdev, &cmd, sizeof(cmd));
1248         hci_uart_set_flow_control(hu, false);
1249         qca_power_setup(hu, false);
1250 }
1251
1252 static int qca_enable_regulator(struct qca_vreg vregs,
1253                                 struct regulator *regulator)
1254 {
1255         int ret;
1256
1257         ret = regulator_set_voltage(regulator, vregs.min_uV,
1258                                     vregs.max_uV);
1259         if (ret)
1260                 return ret;
1261
1262         if (vregs.load_uA)
1263                 ret = regulator_set_load(regulator,
1264                                          vregs.load_uA);
1265
1266         if (ret)
1267                 return ret;
1268
1269         return regulator_enable(regulator);
1270
1271 }
1272
1273 static void qca_disable_regulator(struct qca_vreg vregs,
1274                                   struct regulator *regulator)
1275 {
1276         regulator_disable(regulator);
1277         regulator_set_voltage(regulator, 0, vregs.max_uV);
1278         if (vregs.load_uA)
1279                 regulator_set_load(regulator, 0);
1280
1281 }
1282
1283 static int qca_power_setup(struct hci_uart *hu, bool on)
1284 {
1285         struct qca_vreg *vregs;
1286         struct regulator_bulk_data *vreg_bulk;
1287         struct qca_serdev *qcadev;
1288         int i, num_vregs, ret = 0;
1289
1290         qcadev = serdev_device_get_drvdata(hu->serdev);
1291         if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1292             !qcadev->bt_power->vreg_bulk)
1293                 return -EINVAL;
1294
1295         vregs = qcadev->bt_power->vreg_data->vregs;
1296         vreg_bulk = qcadev->bt_power->vreg_bulk;
1297         num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1298         BT_DBG("on: %d", on);
1299         if (on && !qcadev->bt_power->vregs_on) {
1300                 for (i = 0; i < num_vregs; i++) {
1301                         ret = qca_enable_regulator(vregs[i],
1302                                                    vreg_bulk[i].consumer);
1303                         if (ret)
1304                                 break;
1305                 }
1306
1307                 if (ret) {
1308                         BT_ERR("failed to enable regulator:%s", vregs[i].name);
1309                         /* turn off regulators which are enabled */
1310                         for (i = i - 1; i >= 0; i--)
1311                                 qca_disable_regulator(vregs[i],
1312                                                       vreg_bulk[i].consumer);
1313                 } else {
1314                         qcadev->bt_power->vregs_on = true;
1315                 }
1316         } else if (!on && qcadev->bt_power->vregs_on) {
1317                 /* turn off regulator in reverse order */
1318                 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1319                 for ( ; i >= 0; i--)
1320                         qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1321
1322                 qcadev->bt_power->vregs_on = false;
1323         }
1324
1325         return ret;
1326 }
1327
1328 static int qca_init_regulators(struct qca_power *qca,
1329                                 const struct qca_vreg *vregs, size_t num_vregs)
1330 {
1331         int i;
1332
1333         qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs,
1334                                       sizeof(struct regulator_bulk_data),
1335                                       GFP_KERNEL);
1336         if (!qca->vreg_bulk)
1337                 return -ENOMEM;
1338
1339         for (i = 0; i < num_vregs; i++)
1340                 qca->vreg_bulk[i].supply = vregs[i].name;
1341
1342         return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1343 }
1344
1345 static int qca_serdev_probe(struct serdev_device *serdev)
1346 {
1347         struct qca_serdev *qcadev;
1348         const struct qca_vreg_data *data;
1349         int err;
1350
1351         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1352         if (!qcadev)
1353                 return -ENOMEM;
1354
1355         qcadev->serdev_hu.serdev = serdev;
1356         data = of_device_get_match_data(&serdev->dev);
1357         serdev_device_set_drvdata(serdev, qcadev);
1358         if (data && data->soc_type == QCA_WCN3990) {
1359                 qcadev->btsoc_type = QCA_WCN3990;
1360                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1361                                                 sizeof(struct qca_power),
1362                                                 GFP_KERNEL);
1363                 if (!qcadev->bt_power)
1364                         return -ENOMEM;
1365
1366                 qcadev->bt_power->dev = &serdev->dev;
1367                 qcadev->bt_power->vreg_data = data;
1368                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1369                                           data->num_vregs);
1370                 if (err) {
1371                         BT_ERR("Failed to init regulators:%d", err);
1372                         goto out;
1373                 }
1374
1375                 qcadev->bt_power->vregs_on = false;
1376
1377                 device_property_read_u32(&serdev->dev, "max-speed",
1378                                          &qcadev->oper_speed);
1379                 if (!qcadev->oper_speed)
1380                         BT_DBG("UART will pick default operating speed");
1381
1382                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1383                 if (err) {
1384                         BT_ERR("wcn3990 serdev registration failed");
1385                         goto out;
1386                 }
1387         } else {
1388                 qcadev->btsoc_type = QCA_ROME;
1389                 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1390                                                GPIOD_OUT_LOW);
1391                 if (IS_ERR(qcadev->bt_en)) {
1392                         dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1393                         return PTR_ERR(qcadev->bt_en);
1394                 }
1395
1396                 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1397                 if (IS_ERR(qcadev->susclk)) {
1398                         dev_err(&serdev->dev, "failed to acquire clk\n");
1399                         return PTR_ERR(qcadev->susclk);
1400                 }
1401
1402                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1403                 if (err)
1404                         return err;
1405
1406                 err = clk_prepare_enable(qcadev->susclk);
1407                 if (err)
1408                         return err;
1409
1410                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1411                 if (err)
1412                         clk_disable_unprepare(qcadev->susclk);
1413         }
1414
1415 out:    return err;
1416
1417 }
1418
1419 static void qca_serdev_remove(struct serdev_device *serdev)
1420 {
1421         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1422
1423         if (qcadev->btsoc_type == QCA_WCN3990)
1424                 qca_power_shutdown(&qcadev->serdev_hu);
1425         else
1426                 clk_disable_unprepare(qcadev->susclk);
1427
1428         hci_uart_unregister_device(&qcadev->serdev_hu);
1429 }
1430
1431 static const struct of_device_id qca_bluetooth_of_match[] = {
1432         { .compatible = "qcom,qca6174-bt" },
1433         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data},
1434         { /* sentinel */ }
1435 };
1436 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1437
1438 static struct serdev_device_driver qca_serdev_driver = {
1439         .probe = qca_serdev_probe,
1440         .remove = qca_serdev_remove,
1441         .driver = {
1442                 .name = "hci_uart_qca",
1443                 .of_match_table = qca_bluetooth_of_match,
1444         },
1445 };
1446
1447 int __init qca_init(void)
1448 {
1449         serdev_device_driver_register(&qca_serdev_driver);
1450
1451         return hci_uart_register_proto(&qca_proto);
1452 }
1453
1454 int __exit qca_deinit(void)
1455 {
1456         serdev_device_driver_unregister(&qca_serdev_driver);
1457
1458         return hci_uart_unregister_proto(&qca_proto);
1459 }