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 BAUDRATE_SETTLE_TIMEOUT_MS      300
  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         /* Don't go to sleep in middle of patch download or
 774          * Out-Of-Band(GPIOs control) sleep is selected.
 775          */
 776         if (!test_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags)) {
 777                 skb_queue_tail(&qca->txq, skb);
 778                 return 0;
 779         }
 780
 781         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 782
 783         /* Act according to current state */
 784         switch (qca->tx_ibs_state) {
 785         case HCI_IBS_TX_AWAKE:
 786                 BT_DBG("Device awake, sending normally");
 787                 skb_queue_tail(&qca->txq, skb);
 788                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 789                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 790                 break;
 791
 792         case HCI_IBS_TX_ASLEEP:
 793                 BT_DBG("Device asleep, waking up and queueing packet");
 794                 /* Save packet for later */
 795                 skb_queue_tail(&qca->tx_wait_q, skb);
 796
 797                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 798                 /* Schedule a work queue to wake up device */
 799                 queue_work(qca->workqueue, &qca->ws_awake_device);
 800                 break;
 801
 802         case HCI_IBS_TX_WAKING:
 803                 BT_DBG("Device waking up, queueing packet");
 804                 /* Transient state; just keep packet for later */
 805                 skb_queue_tail(&qca->tx_wait_q, skb);
 806                 break;
 807
 808         default:
 809                 BT_ERR("Illegal tx state: %d (losing packet)",
 810                        qca->tx_ibs_state);
 811                 kfree_skb(skb);
 812                 break;
 813         }
 814
 815         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 816
 817         return 0;
 818 }
 819
 820 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 821 {
 822         struct hci_uart *hu = hci_get_drvdata(hdev);
 823
 824         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 825
 826         device_want_to_sleep(hu);
 827
 828         kfree_skb(skb);
 829         return 0;
 830 }
 831
 832 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 833 {
 834         struct hci_uart *hu = hci_get_drvdata(hdev);
 835
 836         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 837
 838         device_want_to_wakeup(hu);
 839
 840         kfree_skb(skb);
 841         return 0;
 842 }
 843
 844 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 845 {
 846         struct hci_uart *hu = hci_get_drvdata(hdev);
 847
 848         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 849
 850         device_woke_up(hu);
 851
 852         kfree_skb(skb);
 853         return 0;
 854 }
 855
 856 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 857 {
 858         /* We receive debug logs from chip as an ACL packets.
 859          * Instead of sending the data to ACL to decode the
 860          * received data, we are pushing them to the above layers
 861          * as a diagnostic packet.
 862          */
 863         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 864                 return hci_recv_diag(hdev, skb);
 865
 866         return hci_recv_frame(hdev, skb);
 867 }
 868
 869 #define QCA_IBS_SLEEP_IND_EVENT \
 870         .type = HCI_IBS_SLEEP_IND, \
 871         .hlen = 0, \
 872         .loff = 0, \
 873         .lsize = 0, \
 874         .maxlen = HCI_MAX_IBS_SIZE
 875
 876 #define QCA_IBS_WAKE_IND_EVENT \
 877         .type = HCI_IBS_WAKE_IND, \
 878         .hlen = 0, \
 879         .loff = 0, \
 880         .lsize = 0, \
 881         .maxlen = HCI_MAX_IBS_SIZE
 882
 883 #define QCA_IBS_WAKE_ACK_EVENT \
 884         .type = HCI_IBS_WAKE_ACK, \
 885         .hlen = 0, \
 886         .loff = 0, \
 887         .lsize = 0, \
 888         .maxlen = HCI_MAX_IBS_SIZE
 889
 890 static const struct h4_recv_pkt qca_recv_pkts[] = {
 891         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
 892         { H4_RECV_SCO,             .recv = hci_recv_frame    },
 893         { H4_RECV_EVENT,           .recv = hci_recv_frame    },
 894         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
 895         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
 896         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
 897 };
 898
 899 static int qca_recv(struct hci_uart *hu, const void *data, int count)
 900 {
 901         struct qca_data *qca = hu->priv;
 902
 903         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 904                 return -EUNATCH;
 905
 906         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
 907                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
 908         if (IS_ERR(qca->rx_skb)) {
 909                 int err = PTR_ERR(qca->rx_skb);
 910                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 911                 qca->rx_skb = NULL;
 912                 return err;
 913         }
 914
 915         return count;
 916 }
 917
 918 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
 919 {
 920         struct qca_data *qca = hu->priv;
 921
 922         return skb_dequeue(&qca->txq);
 923 }
 924
 925 static uint8_t qca_get_baudrate_value(int speed)
 926 {
 927         switch (speed) {
 928         case 9600:
 929                 return QCA_BAUDRATE_9600;
 930         case 19200:
 931                 return QCA_BAUDRATE_19200;
 932         case 38400:
 933                 return QCA_BAUDRATE_38400;
 934         case 57600:
 935                 return QCA_BAUDRATE_57600;
 936         case 115200:
 937                 return QCA_BAUDRATE_115200;
 938         case 230400:
 939                 return QCA_BAUDRATE_230400;
 940         case 460800:
 941                 return QCA_BAUDRATE_460800;
 942         case 500000:
 943                 return QCA_BAUDRATE_500000;
 944         case 921600:
 945                 return QCA_BAUDRATE_921600;
 946         case 1000000:
 947                 return QCA_BAUDRATE_1000000;
 948         case 2000000:
 949                 return QCA_BAUDRATE_2000000;
 950         case 3000000:
 951                 return QCA_BAUDRATE_3000000;
 952         case 3200000:
 953                 return QCA_BAUDRATE_3200000;
 954         case 3500000:
 955                 return QCA_BAUDRATE_3500000;
 956         default:
 957                 return QCA_BAUDRATE_115200;
 958         }
 959 }
 960
 961 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 962 {
 963         struct hci_uart *hu = hci_get_drvdata(hdev);
 964         struct qca_data *qca = hu->priv;
 965         struct sk_buff *skb;
 966         struct qca_serdev *qcadev;
 967         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
 968
 969         if (baudrate > QCA_BAUDRATE_3200000)
 970                 return -EINVAL;
 971
 972         cmd[4] = baudrate;
 973
 974         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
 975         if (!skb) {
 976                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
 977                 return -ENOMEM;
 978         }
 979
 980         /* Disabling hardware flow control is mandatory while
 981          * sending change baudrate request to wcn3990 SoC.
 982          */
 983         qcadev = serdev_device_get_drvdata(hu->serdev);
 984         if (qcadev->btsoc_type == QCA_WCN3990)
 985                 hci_uart_set_flow_control(hu, true);
 986
 987         /* Assign commands to change baudrate and packet type. */
 988         skb_put_data(skb, cmd, sizeof(cmd));
 989         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
 990
 991         skb_queue_tail(&qca->txq, skb);
 992         hci_uart_tx_wakeup(hu);
 993
 994         /* wait 300ms to change new baudrate on controller side
 995          * controller will come back after they receive this HCI command
 996          * then host can communicate with new baudrate to controller
 997          */
 998         set_current_state(TASK_UNINTERRUPTIBLE);
 999         schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS));
1000         set_current_state(TASK_RUNNING);
1001
1002         if (qcadev->btsoc_type == QCA_WCN3990)
1003                 hci_uart_set_flow_control(hu, false);
1004
1005         return 0;
1006 }
1007
1008 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1009 {
1010         if (hu->serdev)
1011                 serdev_device_set_baudrate(hu->serdev, speed);
1012         else
1013                 hci_uart_set_baudrate(hu, speed);
1014 }
1015
1016 static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd)
1017 {
1018         struct hci_uart *hu = hci_get_drvdata(hdev);
1019         struct qca_data *qca = hu->priv;
1020         struct sk_buff *skb;
1021
1022         /* These power pulses are single byte command which are sent
1023          * at required baudrate to wcn3990. On wcn3990, we have an external
1024          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1025          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1026          * and also we use the same power inputs to turn on and off for
1027          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1028          * we send a power on pulse at 115200 bps. This algorithm will help to
1029          * save power. Disabling hardware flow control is mandatory while
1030          * sending power pulses to SoC.
1031          */
1032         bt_dev_dbg(hdev, "sending power pulse %02x to SoC", cmd);
1033
1034         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1035         if (!skb)
1036                 return -ENOMEM;
1037
1038         hci_uart_set_flow_control(hu, true);
1039
1040         skb_put_u8(skb, cmd);
1041         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1042
1043         skb_queue_tail(&qca->txq, skb);
1044         hci_uart_tx_wakeup(hu);
1045
1046         /* Wait for 100 uS for SoC to settle down */
1047         usleep_range(100, 200);
1048         hci_uart_set_flow_control(hu, false);
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         int ret;
1095
1096         if (speed_type == QCA_INIT_SPEED) {
1097                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1098                 if (speed)
1099                         host_set_baudrate(hu, speed);
1100         } else {
1101                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1102                 if (!speed)
1103                         return 0;
1104
1105                 qca_baudrate = qca_get_baudrate_value(speed);
1106                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1107                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1108                 if (ret)
1109                         return ret;
1110
1111                 host_set_baudrate(hu, speed);
1112         }
1113
1114         return 0;
1115 }
1116
1117 static int qca_wcn3990_init(struct hci_uart *hu)
1118 {
1119         struct hci_dev *hdev = hu->hdev;
1120         struct qca_serdev *qcadev;
1121         int ret;
1122
1123         /* Check for vregs status, may be hci down has turned
1124          * off the voltage regulator.
1125          */
1126         qcadev = serdev_device_get_drvdata(hu->serdev);
1127         if (!qcadev->bt_power->vregs_on) {
1128                 serdev_device_close(hu->serdev);
1129                 ret = qca_power_setup(hu, true);
1130                 if (ret)
1131                         return ret;
1132
1133                 ret = serdev_device_open(hu->serdev);
1134                 if (ret) {
1135                         bt_dev_err(hu->hdev, "failed to open port");
1136                         return ret;
1137                 }
1138         }
1139
1140         /* Forcefully enable wcn3990 to enter in to boot mode. */
1141         host_set_baudrate(hu, 2400);
1142         ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE);
1143         if (ret)
1144                 return ret;
1145
1146         qca_set_speed(hu, QCA_INIT_SPEED);
1147         ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWERON_PULSE);
1148         if (ret)
1149                 return ret;
1150
1151         /* Wait for 100 ms for SoC to boot */
1152         msleep(100);
1153
1154         /* Now the device is in ready state to communicate with host.
1155          * To sync host with device we need to reopen port.
1156          * Without this, we will have RTS and CTS synchronization
1157          * issues.
1158          */
1159         serdev_device_close(hu->serdev);
1160         ret = serdev_device_open(hu->serdev);
1161         if (ret) {
1162                 bt_dev_err(hu->hdev, "failed to open port");
1163                 return ret;
1164         }
1165
1166         hci_uart_set_flow_control(hu, false);
1167
1168         return 0;
1169 }
1170
1171 static int qca_setup(struct hci_uart *hu)
1172 {
1173         struct hci_dev *hdev = hu->hdev;
1174         struct qca_data *qca = hu->priv;
1175         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1176         struct qca_serdev *qcadev;
1177         int ret;
1178         int soc_ver = 0;
1179
1180         qcadev = serdev_device_get_drvdata(hu->serdev);
1181
1182         ret = qca_check_speeds(hu);
1183         if (ret)
1184                 return ret;
1185
1186         /* Patch downloading has to be done without IBS mode */
1187         clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1188
1189         if (qcadev->btsoc_type == QCA_WCN3990) {
1190                 bt_dev_info(hdev, "setting up wcn3990");
1191
1192                 /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute
1193                  * setup for every hci up.
1194                  */
1195                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1196                 hu->hdev->shutdown = qca_power_off;
1197                 ret = qca_wcn3990_init(hu);
1198                 if (ret)
1199                         return ret;
1200
1201                 ret = qca_read_soc_version(hdev, &soc_ver);
1202                 if (ret)
1203                         return ret;
1204         } else {
1205                 bt_dev_info(hdev, "ROME setup");
1206                 qca_set_speed(hu, QCA_INIT_SPEED);
1207         }
1208
1209         /* Setup user speed if needed */
1210         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1211         if (speed) {
1212                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1213                 if (ret)
1214                         return ret;
1215
1216                 qca_baudrate = qca_get_baudrate_value(speed);
1217         }
1218
1219         if (qcadev->btsoc_type != QCA_WCN3990) {
1220                 /* Get QCA version information */
1221                 ret = qca_read_soc_version(hdev, &soc_ver);
1222                 if (ret)
1223                         return ret;
1224         }
1225
1226         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1227         /* Setup patch / NVM configurations */
1228         ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver);
1229         if (!ret) {
1230                 set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
1231                 qca_debugfs_init(hdev);
1232         } else if (ret == -ENOENT) {
1233                 /* No patch/nvm-config found, run with original fw/config */
1234                 ret = 0;
1235         } else if (ret == -EAGAIN) {
1236                 /*
1237                  * Userspace firmware loader will return -EAGAIN in case no
1238                  * patch/nvm-config is found, so run with original fw/config.
1239                  */
1240                 ret = 0;
1241         }
1242
1243         /* Setup bdaddr */
1244         hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1245
1246         return ret;
1247 }
1248
1249 static struct hci_uart_proto qca_proto = {
1250         .id             = HCI_UART_QCA,
1251         .name           = "QCA",
1252         .manufacturer   = 29,
1253         .init_speed     = 115200,
1254         .oper_speed     = 3000000,
1255         .open           = qca_open,
1256         .close          = qca_close,
1257         .flush          = qca_flush,
1258         .setup          = qca_setup,
1259         .recv           = qca_recv,
1260         .enqueue        = qca_enqueue,
1261         .dequeue        = qca_dequeue,
1262 };
1263
1264 static const struct qca_vreg_data qca_soc_data = {
1265         .soc_type = QCA_WCN3990,
1266         .vregs = (struct qca_vreg []) {
1267                 { "vddio",   1800000, 1900000,  15000  },
1268                 { "vddxo",   1800000, 1900000,  80000  },
1269                 { "vddrf",   1300000, 1350000,  300000 },
1270                 { "vddch0",  3300000, 3400000,  450000 },
1271         },
1272         .num_vregs = 4,
1273 };
1274
1275 static void qca_power_shutdown(struct hci_uart *hu)
1276 {
1277         struct serdev_device *serdev = hu->serdev;
1278         unsigned char cmd = QCA_WCN3990_POWEROFF_PULSE;
1279
1280         host_set_baudrate(hu, 2400);
1281         hci_uart_set_flow_control(hu, true);
1282         serdev_device_write_buf(serdev, &cmd, sizeof(cmd));
1283         hci_uart_set_flow_control(hu, false);
1284         qca_power_setup(hu, false);
1285 }
1286
1287 static int qca_power_off(struct hci_dev *hdev)
1288 {
1289         struct hci_uart *hu = hci_get_drvdata(hdev);
1290
1291         qca_power_shutdown(hu);
1292         return 0;
1293 }
1294
1295 static int qca_enable_regulator(struct qca_vreg vregs,
1296                                 struct regulator *regulator)
1297 {
1298         int ret;
1299
1300         ret = regulator_set_voltage(regulator, vregs.min_uV,
1301                                     vregs.max_uV);
1302         if (ret)
1303                 return ret;
1304
1305         if (vregs.load_uA)
1306                 ret = regulator_set_load(regulator,
1307                                          vregs.load_uA);
1308
1309         if (ret)
1310                 return ret;
1311
1312         return regulator_enable(regulator);
1313
1314 }
1315
1316 static void qca_disable_regulator(struct qca_vreg vregs,
1317                                   struct regulator *regulator)
1318 {
1319         regulator_disable(regulator);
1320         regulator_set_voltage(regulator, 0, vregs.max_uV);
1321         if (vregs.load_uA)
1322                 regulator_set_load(regulator, 0);
1323
1324 }
1325
1326 static int qca_power_setup(struct hci_uart *hu, bool on)
1327 {
1328         struct qca_vreg *vregs;
1329         struct regulator_bulk_data *vreg_bulk;
1330         struct qca_serdev *qcadev;
1331         int i, num_vregs, ret = 0;
1332
1333         qcadev = serdev_device_get_drvdata(hu->serdev);
1334         if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
1335             !qcadev->bt_power->vreg_bulk)
1336                 return -EINVAL;
1337
1338         vregs = qcadev->bt_power->vreg_data->vregs;
1339         vreg_bulk = qcadev->bt_power->vreg_bulk;
1340         num_vregs = qcadev->bt_power->vreg_data->num_vregs;
1341         BT_DBG("on: %d", on);
1342         if (on && !qcadev->bt_power->vregs_on) {
1343                 for (i = 0; i < num_vregs; i++) {
1344                         ret = qca_enable_regulator(vregs[i],
1345                                                    vreg_bulk[i].consumer);
1346                         if (ret)
1347                                 break;
1348                 }
1349
1350                 if (ret) {
1351                         BT_ERR("failed to enable regulator:%s", vregs[i].name);
1352                         /* turn off regulators which are enabled */
1353                         for (i = i - 1; i >= 0; i--)
1354                                 qca_disable_regulator(vregs[i],
1355                                                       vreg_bulk[i].consumer);
1356                 } else {
1357                         qcadev->bt_power->vregs_on = true;
1358                 }
1359         } else if (!on && qcadev->bt_power->vregs_on) {
1360                 /* turn off regulator in reverse order */
1361                 i = qcadev->bt_power->vreg_data->num_vregs - 1;
1362                 for ( ; i >= 0; i--)
1363                         qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
1364
1365                 qcadev->bt_power->vregs_on = false;
1366         }
1367
1368         return ret;
1369 }
1370
1371 static int qca_init_regulators(struct qca_power *qca,
1372                                 const struct qca_vreg *vregs, size_t num_vregs)
1373 {
1374         int i;
1375
1376         qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs,
1377                                       sizeof(struct regulator_bulk_data),
1378                                       GFP_KERNEL);
1379         if (!qca->vreg_bulk)
1380                 return -ENOMEM;
1381
1382         for (i = 0; i < num_vregs; i++)
1383                 qca->vreg_bulk[i].supply = vregs[i].name;
1384
1385         return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
1386 }
1387
1388 static int qca_serdev_probe(struct serdev_device *serdev)
1389 {
1390         struct qca_serdev *qcadev;
1391         const struct qca_vreg_data *data;
1392         int err;
1393
1394         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1395         if (!qcadev)
1396                 return -ENOMEM;
1397
1398         qcadev->serdev_hu.serdev = serdev;
1399         data = of_device_get_match_data(&serdev->dev);
1400         serdev_device_set_drvdata(serdev, qcadev);
1401         if (data && data->soc_type == QCA_WCN3990) {
1402                 qcadev->btsoc_type = QCA_WCN3990;
1403                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1404                                                 sizeof(struct qca_power),
1405                                                 GFP_KERNEL);
1406                 if (!qcadev->bt_power)
1407                         return -ENOMEM;
1408
1409                 qcadev->bt_power->dev = &serdev->dev;
1410                 qcadev->bt_power->vreg_data = data;
1411                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1412                                           data->num_vregs);
1413                 if (err) {
1414                         BT_ERR("Failed to init regulators:%d", err);
1415                         goto out;
1416                 }
1417
1418                 qcadev->bt_power->vregs_on = false;
1419
1420                 device_property_read_u32(&serdev->dev, "max-speed",
1421                                          &qcadev->oper_speed);
1422                 if (!qcadev->oper_speed)
1423                         BT_DBG("UART will pick default operating speed");
1424
1425                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1426                 if (err) {
1427                         BT_ERR("wcn3990 serdev registration failed");
1428                         goto out;
1429                 }
1430         } else {
1431                 qcadev->btsoc_type = QCA_ROME;
1432                 qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
1433                                                GPIOD_OUT_LOW);
1434                 if (IS_ERR(qcadev->bt_en)) {
1435                         dev_err(&serdev->dev, "failed to acquire enable gpio\n");
1436                         return PTR_ERR(qcadev->bt_en);
1437                 }
1438
1439                 qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
1440                 if (IS_ERR(qcadev->susclk)) {
1441                         dev_err(&serdev->dev, "failed to acquire clk\n");
1442                         return PTR_ERR(qcadev->susclk);
1443                 }
1444
1445                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1446                 if (err)
1447                         return err;
1448
1449                 err = clk_prepare_enable(qcadev->susclk);
1450                 if (err)
1451                         return err;
1452
1453                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1454                 if (err)
1455                         clk_disable_unprepare(qcadev->susclk);
1456         }
1457
1458 out:    return err;
1459
1460 }
1461
1462 static void qca_serdev_remove(struct serdev_device *serdev)
1463 {
1464         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
1465
1466         if (qcadev->btsoc_type == QCA_WCN3990)
1467                 qca_power_shutdown(&qcadev->serdev_hu);
1468         else
1469                 clk_disable_unprepare(qcadev->susclk);
1470
1471         hci_uart_unregister_device(&qcadev->serdev_hu);
1472 }
1473
1474 static const struct of_device_id qca_bluetooth_of_match[] = {
1475         { .compatible = "qcom,qca6174-bt" },
1476         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data},
1477         { /* sentinel */ }
1478 };
1479 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
1480
1481 static struct serdev_device_driver qca_serdev_driver = {
1482         .probe = qca_serdev_probe,
1483         .remove = qca_serdev_remove,
1484         .driver = {
1485                 .name = "hci_uart_qca",
1486                 .of_match_table = qca_bluetooth_of_match,
1487         },
1488 };
1489
1490 int __init qca_init(void)
1491 {
1492         serdev_device_driver_register(&qca_serdev_driver);
1493
1494         return hci_uart_register_proto(&qca_proto);
1495 }
1496
1497 int __exit qca_deinit(void)
1498 {
1499         serdev_device_driver_unregister(&qca_serdev_driver);
1500
1501         return hci_uart_unregister_proto(&qca_proto);
1502 }