drivers/bluetooth/hci_qca.c

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