drivers/bluetooth/hci_qca.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Bluetooth Software UART Qualcomm protocol
   4  *
   5  *  HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management
   6  *  protocol extension to H4.
   7  *
   8  *  Copyright (C) 2007 Texas Instruments, Inc.
   9  *  Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved.
  10  *
  11  *  Acknowledgements:
  12  *  This file is based on hci_ll.c, which was...
  13  *  Written by Ohad Ben-Cohen <ohad@bencohen.org>
  14  *  which was in turn based on hci_h4.c, which was written
  15  *  by Maxim Krasnyansky and Marcel Holtmann.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/clk.h>
  20 #include <linux/completion.h>
  21 #include <linux/debugfs.h>
  22 #include <linux/delay.h>
  23 #include <linux/devcoredump.h>
  24 #include <linux/device.h>
  25 #include <linux/gpio/consumer.h>
  26 #include <linux/mod_devicetable.h>
  27 #include <linux/module.h>
  28 #include <linux/of_device.h>
  29 #include <linux/acpi.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/regulator/consumer.h>
  32 #include <linux/serdev.h>
  33 #include <linux/mutex.h>
  34 #include <asm/unaligned.h>
  35
  36 #include <net/bluetooth/bluetooth.h>
  37 #include <net/bluetooth/hci_core.h>
  38
  39 #include "hci_uart.h"
  40 #include "btqca.h"
  41
  42 /* HCI_IBS protocol messages */
  43 #define HCI_IBS_SLEEP_IND       0xFE
  44 #define HCI_IBS_WAKE_IND        0xFD
  45 #define HCI_IBS_WAKE_ACK        0xFC
  46 #define HCI_MAX_IBS_SIZE        10
  47
  48 #define IBS_WAKE_RETRANS_TIMEOUT_MS     100
  49 #define IBS_BTSOC_TX_IDLE_TIMEOUT_MS    200
  50 #define IBS_HOST_TX_IDLE_TIMEOUT_MS     2000
  51 #define CMD_TRANS_TIMEOUT_MS            100
  52 #define MEMDUMP_TIMEOUT_MS              8000
  53
  54 /* susclk rate */
  55 #define SUSCLK_RATE_32KHZ       32768
  56
  57 /* Controller debug log header */
  58 #define QCA_DEBUG_HANDLE        0x2EDC
  59
  60 /* max retry count when init fails */
  61 #define MAX_INIT_RETRIES 3
  62
  63 /* Controller dump header */
  64 #define QCA_SSR_DUMP_HANDLE             0x0108
  65 #define QCA_DUMP_PACKET_SIZE            255
  66 #define QCA_LAST_SEQUENCE_NUM           0xFFFF
  67 #define QCA_CRASHBYTE_PACKET_LEN        1096
  68 #define QCA_MEMDUMP_BYTE                0xFB
  69
  70 enum qca_flags {
  71         QCA_IBS_ENABLED,
  72         QCA_DROP_VENDOR_EVENT,
  73         QCA_SUSPENDING,
  74         QCA_MEMDUMP_COLLECTION,
  75         QCA_HW_ERROR_EVENT,
  76         QCA_SSR_TRIGGERED
  77 };
  78
  79 enum qca_capabilities {
  80         QCA_CAP_WIDEBAND_SPEECH = BIT(0),
  81 };
  82
  83 /* HCI_IBS transmit side sleep protocol states */
  84 enum tx_ibs_states {
  85         HCI_IBS_TX_ASLEEP,
  86         HCI_IBS_TX_WAKING,
  87         HCI_IBS_TX_AWAKE,
  88 };
  89
  90 /* HCI_IBS receive side sleep protocol states */
  91 enum rx_states {
  92         HCI_IBS_RX_ASLEEP,
  93         HCI_IBS_RX_AWAKE,
  94 };
  95
  96 /* HCI_IBS transmit and receive side clock state vote */
  97 enum hci_ibs_clock_state_vote {
  98         HCI_IBS_VOTE_STATS_UPDATE,
  99         HCI_IBS_TX_VOTE_CLOCK_ON,
 100         HCI_IBS_TX_VOTE_CLOCK_OFF,
 101         HCI_IBS_RX_VOTE_CLOCK_ON,
 102         HCI_IBS_RX_VOTE_CLOCK_OFF,
 103 };
 104
 105 /* Controller memory dump states */
 106 enum qca_memdump_states {
 107         QCA_MEMDUMP_IDLE,
 108         QCA_MEMDUMP_COLLECTING,
 109         QCA_MEMDUMP_COLLECTED,
 110         QCA_MEMDUMP_TIMEOUT,
 111 };
 112
 113 struct qca_memdump_data {
 114         char *memdump_buf_head;
 115         char *memdump_buf_tail;
 116         u32 current_seq_no;
 117         u32 received_dump;
 118         u32 ram_dump_size;
 119 };
 120
 121 struct qca_memdump_event_hdr {
 122         __u8    evt;
 123         __u8    plen;
 124         __u16   opcode;
 125         __u16   seq_no;
 126         __u8    reserved;
 127 } __packed;
 128
 129
 130 struct qca_dump_size {
 131         u32 dump_size;
 132 } __packed;
 133
 134 struct qca_data {
 135         struct hci_uart *hu;
 136         struct sk_buff *rx_skb;
 137         struct sk_buff_head txq;
 138         struct sk_buff_head tx_wait_q;  /* HCI_IBS wait queue   */
 139         struct sk_buff_head rx_memdump_q;       /* Memdump wait queue   */
 140         spinlock_t hci_ibs_lock;        /* HCI_IBS state lock   */
 141         u8 tx_ibs_state;        /* HCI_IBS transmit side power state*/
 142         u8 rx_ibs_state;        /* HCI_IBS receive side power state */
 143         bool tx_vote;           /* Clock must be on for TX */
 144         bool rx_vote;           /* Clock must be on for RX */
 145         struct timer_list tx_idle_timer;
 146         u32 tx_idle_delay;
 147         struct timer_list wake_retrans_timer;
 148         u32 wake_retrans;
 149         struct workqueue_struct *workqueue;
 150         struct work_struct ws_awake_rx;
 151         struct work_struct ws_awake_device;
 152         struct work_struct ws_rx_vote_off;
 153         struct work_struct ws_tx_vote_off;
 154         struct work_struct ctrl_memdump_evt;
 155         struct delayed_work ctrl_memdump_timeout;
 156         struct qca_memdump_data *qca_memdump;
 157         unsigned long flags;
 158         struct completion drop_ev_comp;
 159         wait_queue_head_t suspend_wait_q;
 160         enum qca_memdump_states memdump_state;
 161         struct mutex hci_memdump_lock;
 162
 163         /* For debugging purpose */
 164         u64 ibs_sent_wacks;
 165         u64 ibs_sent_slps;
 166         u64 ibs_sent_wakes;
 167         u64 ibs_recv_wacks;
 168         u64 ibs_recv_slps;
 169         u64 ibs_recv_wakes;
 170         u64 vote_last_jif;
 171         u32 vote_on_ms;
 172         u32 vote_off_ms;
 173         u64 tx_votes_on;
 174         u64 rx_votes_on;
 175         u64 tx_votes_off;
 176         u64 rx_votes_off;
 177         u64 votes_on;
 178         u64 votes_off;
 179 };
 180
 181 enum qca_speed_type {
 182         QCA_INIT_SPEED = 1,
 183         QCA_OPER_SPEED
 184 };
 185
 186 /*
 187  * Voltage regulator information required for configuring the
 188  * QCA Bluetooth chipset
 189  */
 190 struct qca_vreg {
 191         const char *name;
 192         unsigned int load_uA;
 193 };
 194
 195 struct qca_device_data {
 196         enum qca_btsoc_type soc_type;
 197         struct qca_vreg *vregs;
 198         size_t num_vregs;
 199         uint32_t capabilities;
 200 };
 201
 202 /*
 203  * Platform data for the QCA Bluetooth power driver.
 204  */
 205 struct qca_power {
 206         struct device *dev;
 207         struct regulator_bulk_data *vreg_bulk;
 208         int num_vregs;
 209         bool vregs_on;
 210 };
 211
 212 struct qca_serdev {
 213         struct hci_uart  serdev_hu;
 214         struct gpio_desc *bt_en;
 215         struct clk       *susclk;
 216         enum qca_btsoc_type btsoc_type;
 217         struct qca_power *bt_power;
 218         u32 init_speed;
 219         u32 oper_speed;
 220         const char *firmware_name;
 221 };
 222
 223 static int qca_regulator_enable(struct qca_serdev *qcadev);
 224 static void qca_regulator_disable(struct qca_serdev *qcadev);
 225 static void qca_power_shutdown(struct hci_uart *hu);
 226 static int qca_power_off(struct hci_dev *hdev);
 227 static void qca_controller_memdump(struct work_struct *work);
 228
 229 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
 230 {
 231         enum qca_btsoc_type soc_type;
 232
 233         if (hu->serdev) {
 234                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 235
 236                 soc_type = qsd->btsoc_type;
 237         } else {
 238                 soc_type = QCA_ROME;
 239         }
 240
 241         return soc_type;
 242 }
 243
 244 static const char *qca_get_firmware_name(struct hci_uart *hu)
 245 {
 246         if (hu->serdev) {
 247                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 248
 249                 return qsd->firmware_name;
 250         } else {
 251                 return NULL;
 252         }
 253 }
 254
 255 static void __serial_clock_on(struct tty_struct *tty)
 256 {
 257         /* TODO: Some chipset requires to enable UART clock on client
 258          * side to save power consumption or manual work is required.
 259          * Please put your code to control UART clock here if needed
 260          */
 261 }
 262
 263 static void __serial_clock_off(struct tty_struct *tty)
 264 {
 265         /* TODO: Some chipset requires to disable UART clock on client
 266          * side to save power consumption or manual work is required.
 267          * Please put your code to control UART clock off here if needed
 268          */
 269 }
 270
 271 /* serial_clock_vote needs to be called with the ibs lock held */
 272 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
 273 {
 274         struct qca_data *qca = hu->priv;
 275         unsigned int diff;
 276
 277         bool old_vote = (qca->tx_vote | qca->rx_vote);
 278         bool new_vote;
 279
 280         switch (vote) {
 281         case HCI_IBS_VOTE_STATS_UPDATE:
 282                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 283
 284                 if (old_vote)
 285                         qca->vote_off_ms += diff;
 286                 else
 287                         qca->vote_on_ms += diff;
 288                 return;
 289
 290         case HCI_IBS_TX_VOTE_CLOCK_ON:
 291                 qca->tx_vote = true;
 292                 qca->tx_votes_on++;
 293                 break;
 294
 295         case HCI_IBS_RX_VOTE_CLOCK_ON:
 296                 qca->rx_vote = true;
 297                 qca->rx_votes_on++;
 298                 break;
 299
 300         case HCI_IBS_TX_VOTE_CLOCK_OFF:
 301                 qca->tx_vote = false;
 302                 qca->tx_votes_off++;
 303                 break;
 304
 305         case HCI_IBS_RX_VOTE_CLOCK_OFF:
 306                 qca->rx_vote = false;
 307                 qca->rx_votes_off++;
 308                 break;
 309
 310         default:
 311                 BT_ERR("Voting irregularity");
 312                 return;
 313         }
 314
 315         new_vote = qca->rx_vote | qca->tx_vote;
 316
 317         if (new_vote != old_vote) {
 318                 if (new_vote)
 319                         __serial_clock_on(hu->tty);
 320                 else
 321                         __serial_clock_off(hu->tty);
 322
 323                 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
 324                        vote ? "true" : "false");
 325
 326                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 327
 328                 if (new_vote) {
 329                         qca->votes_on++;
 330                         qca->vote_off_ms += diff;
 331                 } else {
 332                         qca->votes_off++;
 333                         qca->vote_on_ms += diff;
 334                 }
 335                 qca->vote_last_jif = jiffies;
 336         }
 337 }
 338
 339 /* Builds and sends an HCI_IBS command packet.
 340  * These are very simple packets with only 1 cmd byte.
 341  */
 342 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
 343 {
 344         int err = 0;
 345         struct sk_buff *skb = NULL;
 346         struct qca_data *qca = hu->priv;
 347
 348         BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
 349
 350         skb = bt_skb_alloc(1, GFP_ATOMIC);
 351         if (!skb) {
 352                 BT_ERR("Failed to allocate memory for HCI_IBS packet");
 353                 return -ENOMEM;
 354         }
 355
 356         /* Assign HCI_IBS type */
 357         skb_put_u8(skb, cmd);
 358
 359         skb_queue_tail(&qca->txq, skb);
 360
 361         return err;
 362 }
 363
 364 static void qca_wq_awake_device(struct work_struct *work)
 365 {
 366         struct qca_data *qca = container_of(work, struct qca_data,
 367                                             ws_awake_device);
 368         struct hci_uart *hu = qca->hu;
 369         unsigned long retrans_delay;
 370         unsigned long flags;
 371
 372         BT_DBG("hu %p wq awake device", hu);
 373
 374         /* Vote for serial clock */
 375         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
 376
 377         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 378
 379         /* Send wake indication to device */
 380         if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
 381                 BT_ERR("Failed to send WAKE to device");
 382
 383         qca->ibs_sent_wakes++;
 384
 385         /* Start retransmit timer */
 386         retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 387         mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 388
 389         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 390
 391         /* Actually send the packets */
 392         hci_uart_tx_wakeup(hu);
 393 }
 394
 395 static void qca_wq_awake_rx(struct work_struct *work)
 396 {
 397         struct qca_data *qca = container_of(work, struct qca_data,
 398                                             ws_awake_rx);
 399         struct hci_uart *hu = qca->hu;
 400         unsigned long flags;
 401
 402         BT_DBG("hu %p wq awake rx", hu);
 403
 404         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
 405
 406         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 407         qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
 408
 409         /* Always acknowledge device wake up,
 410          * sending IBS message doesn't count as TX ON.
 411          */
 412         if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
 413                 BT_ERR("Failed to acknowledge device wake up");
 414
 415         qca->ibs_sent_wacks++;
 416
 417         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 418
 419         /* Actually send the packets */
 420         hci_uart_tx_wakeup(hu);
 421 }
 422
 423 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
 424 {
 425         struct qca_data *qca = container_of(work, struct qca_data,
 426                                             ws_rx_vote_off);
 427         struct hci_uart *hu = qca->hu;
 428
 429         BT_DBG("hu %p rx clock vote off", hu);
 430
 431         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
 432 }
 433
 434 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
 435 {
 436         struct qca_data *qca = container_of(work, struct qca_data,
 437                                             ws_tx_vote_off);
 438         struct hci_uart *hu = qca->hu;
 439
 440         BT_DBG("hu %p tx clock vote off", hu);
 441
 442         /* Run HCI tx handling unlocked */
 443         hci_uart_tx_wakeup(hu);
 444
 445         /* Now that message queued to tty driver, vote for tty clocks off.
 446          * It is up to the tty driver to pend the clocks off until tx done.
 447          */
 448         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
 449 }
 450
 451 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 452 {
 453         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 454         struct hci_uart *hu = qca->hu;
 455         unsigned long flags;
 456
 457         BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
 458
 459         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 460                                  flags, SINGLE_DEPTH_NESTING);
 461
 462         switch (qca->tx_ibs_state) {
 463         case HCI_IBS_TX_AWAKE:
 464                 /* TX_IDLE, go to SLEEP */
 465                 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
 466                         BT_ERR("Failed to send SLEEP to device");
 467                         break;
 468                 }
 469                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 470                 qca->ibs_sent_slps++;
 471                 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
 472                 break;
 473
 474         case HCI_IBS_TX_ASLEEP:
 475         case HCI_IBS_TX_WAKING:
 476         default:
 477                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 478                 break;
 479         }
 480
 481         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 482 }
 483
 484 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 485 {
 486         struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
 487         struct hci_uart *hu = qca->hu;
 488         unsigned long flags, retrans_delay;
 489         bool retransmit = false;
 490
 491         BT_DBG("hu %p wake retransmit timeout in %d state",
 492                 hu, qca->tx_ibs_state);
 493
 494         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 495                                  flags, SINGLE_DEPTH_NESTING);
 496
 497         /* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */
 498         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 499                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 500                 return;
 501         }
 502
 503         switch (qca->tx_ibs_state) {
 504         case HCI_IBS_TX_WAKING:
 505                 /* No WAKE_ACK, retransmit WAKE */
 506                 retransmit = true;
 507                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
 508                         BT_ERR("Failed to acknowledge device wake up");
 509                         break;
 510                 }
 511                 qca->ibs_sent_wakes++;
 512                 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 513                 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 514                 break;
 515
 516         case HCI_IBS_TX_ASLEEP:
 517         case HCI_IBS_TX_AWAKE:
 518         default:
 519                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 520                 break;
 521         }
 522
 523         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 524
 525         if (retransmit)
 526                 hci_uart_tx_wakeup(hu);
 527 }
 528
 529
 530 static void qca_controller_memdump_timeout(struct work_struct *work)
 531 {
 532         struct qca_data *qca = container_of(work, struct qca_data,
 533                                         ctrl_memdump_timeout.work);
 534         struct hci_uart *hu = qca->hu;
 535
 536         mutex_lock(&qca->hci_memdump_lock);
 537         if (test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
 538                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
 539                 if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
 540                         /* Inject hw error event to reset the device
 541                          * and driver.
 542                          */
 543                         hci_reset_dev(hu->hdev);
 544                 }
 545         }
 546
 547         mutex_unlock(&qca->hci_memdump_lock);
 548 }
 549
 550
 551 /* Initialize protocol */
 552 static int qca_open(struct hci_uart *hu)
 553 {
 554         struct qca_serdev *qcadev;
 555         struct qca_data *qca;
 556
 557         BT_DBG("hu %p qca_open", hu);
 558
 559         if (!hci_uart_has_flow_control(hu))
 560                 return -EOPNOTSUPP;
 561
 562         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 563         if (!qca)
 564                 return -ENOMEM;
 565
 566         skb_queue_head_init(&qca->txq);
 567         skb_queue_head_init(&qca->tx_wait_q);
 568         skb_queue_head_init(&qca->rx_memdump_q);
 569         spin_lock_init(&qca->hci_ibs_lock);
 570         mutex_init(&qca->hci_memdump_lock);
 571         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 572         if (!qca->workqueue) {
 573                 BT_ERR("QCA Workqueue not initialized properly");
 574                 kfree(qca);
 575                 return -ENOMEM;
 576         }
 577
 578         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 579         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 580         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 581         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 582         INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
 583         INIT_DELAYED_WORK(&qca->ctrl_memdump_timeout,
 584                           qca_controller_memdump_timeout);
 585         init_waitqueue_head(&qca->suspend_wait_q);
 586
 587         qca->hu = hu;
 588         init_completion(&qca->drop_ev_comp);
 589
 590         /* Assume we start with both sides asleep -- extra wakes OK */
 591         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 592         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 593
 594         qca->vote_last_jif = jiffies;
 595
 596         hu->priv = qca;
 597
 598         if (hu->serdev) {
 599                 qcadev = serdev_device_get_drvdata(hu->serdev);
 600
 601                 if (qca_is_wcn399x(qcadev->btsoc_type))
 602                         hu->init_speed = qcadev->init_speed;
 603
 604                 if (qcadev->oper_speed)
 605                         hu->oper_speed = qcadev->oper_speed;
 606         }
 607
 608         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 609         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 610
 611         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 612         qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS;
 613
 614         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 615                qca->tx_idle_delay, qca->wake_retrans);
 616
 617         return 0;
 618 }
 619
 620 static void qca_debugfs_init(struct hci_dev *hdev)
 621 {
 622         struct hci_uart *hu = hci_get_drvdata(hdev);
 623         struct qca_data *qca = hu->priv;
 624         struct dentry *ibs_dir;
 625         umode_t mode;
 626
 627         if (!hdev->debugfs)
 628                 return;
 629
 630         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 631
 632         /* read only */
 633         mode = S_IRUGO;
 634         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 635         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 636         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 637                            &qca->ibs_sent_slps);
 638         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 639                            &qca->ibs_sent_wakes);
 640         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 641                            &qca->ibs_sent_wacks);
 642         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 643                            &qca->ibs_recv_slps);
 644         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 645                            &qca->ibs_recv_wakes);
 646         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 647                            &qca->ibs_recv_wacks);
 648         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 649         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 650         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 651         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 652         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 653         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 654         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 655         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 656         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 657         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 658
 659         /* read/write */
 660         mode = S_IRUGO | S_IWUSR;
 661         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 662         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 663                            &qca->tx_idle_delay);
 664 }
 665
 666 /* Flush protocol data */
 667 static int qca_flush(struct hci_uart *hu)
 668 {
 669         struct qca_data *qca = hu->priv;
 670
 671         BT_DBG("hu %p qca flush", hu);
 672
 673         skb_queue_purge(&qca->tx_wait_q);
 674         skb_queue_purge(&qca->txq);
 675
 676         return 0;
 677 }
 678
 679 /* Close protocol */
 680 static int qca_close(struct hci_uart *hu)
 681 {
 682         struct qca_data *qca = hu->priv;
 683
 684         BT_DBG("hu %p qca close", hu);
 685
 686         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 687
 688         skb_queue_purge(&qca->tx_wait_q);
 689         skb_queue_purge(&qca->txq);
 690         skb_queue_purge(&qca->rx_memdump_q);
 691         del_timer(&qca->tx_idle_timer);
 692         del_timer(&qca->wake_retrans_timer);
 693         destroy_workqueue(qca->workqueue);
 694         qca->hu = NULL;
 695
 696         qca_power_shutdown(hu);
 697
 698         kfree_skb(qca->rx_skb);
 699
 700         hu->priv = NULL;
 701
 702         kfree(qca);
 703
 704         return 0;
 705 }
 706
 707 /* Called upon a wake-up-indication from the device.
 708  */
 709 static void device_want_to_wakeup(struct hci_uart *hu)
 710 {
 711         unsigned long flags;
 712         struct qca_data *qca = hu->priv;
 713
 714         BT_DBG("hu %p want to wake up", hu);
 715
 716         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 717
 718         qca->ibs_recv_wakes++;
 719
 720         /* Don't wake the rx up when suspending. */
 721         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 722                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 723                 return;
 724         }
 725
 726         switch (qca->rx_ibs_state) {
 727         case HCI_IBS_RX_ASLEEP:
 728                 /* Make sure clock is on - we may have turned clock off since
 729                  * receiving the wake up indicator awake rx clock.
 730                  */
 731                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 732                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 733                 return;
 734
 735         case HCI_IBS_RX_AWAKE:
 736                 /* Always acknowledge device wake up,
 737                  * sending IBS message doesn't count as TX ON.
 738                  */
 739                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 740                         BT_ERR("Failed to acknowledge device wake up");
 741                         break;
 742                 }
 743                 qca->ibs_sent_wacks++;
 744                 break;
 745
 746         default:
 747                 /* Any other state is illegal */
 748                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 749                        qca->rx_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 /* Called upon a sleep-indication from the device.
 760  */
 761 static void device_want_to_sleep(struct hci_uart *hu)
 762 {
 763         unsigned long flags;
 764         struct qca_data *qca = hu->priv;
 765
 766         BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);
 767
 768         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 769
 770         qca->ibs_recv_slps++;
 771
 772         switch (qca->rx_ibs_state) {
 773         case HCI_IBS_RX_AWAKE:
 774                 /* Update state */
 775                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 776                 /* Vote off rx clock under workqueue */
 777                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 778                 break;
 779
 780         case HCI_IBS_RX_ASLEEP:
 781                 break;
 782
 783         default:
 784                 /* Any other state is illegal */
 785                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 786                        qca->rx_ibs_state);
 787                 break;
 788         }
 789
 790         wake_up_interruptible(&qca->suspend_wait_q);
 791
 792         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 793 }
 794
 795 /* Called upon wake-up-acknowledgement from the device
 796  */
 797 static void device_woke_up(struct hci_uart *hu)
 798 {
 799         unsigned long flags, idle_delay;
 800         struct qca_data *qca = hu->priv;
 801         struct sk_buff *skb = NULL;
 802
 803         BT_DBG("hu %p woke up", hu);
 804
 805         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 806
 807         qca->ibs_recv_wacks++;
 808
 809         /* Don't react to the wake-up-acknowledgment when suspending. */
 810         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 811                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 812                 return;
 813         }
 814
 815         switch (qca->tx_ibs_state) {
 816         case HCI_IBS_TX_AWAKE:
 817                 /* Expect one if we send 2 WAKEs */
 818                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 819                        qca->tx_ibs_state);
 820                 break;
 821
 822         case HCI_IBS_TX_WAKING:
 823                 /* Send pending packets */
 824                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 825                         skb_queue_tail(&qca->txq, skb);
 826
 827                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 828                 del_timer(&qca->wake_retrans_timer);
 829                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 830                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 831                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 832                 break;
 833
 834         case HCI_IBS_TX_ASLEEP:
 835         default:
 836                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 837                        qca->tx_ibs_state);
 838                 break;
 839         }
 840
 841         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 842
 843         /* Actually send the packets */
 844         hci_uart_tx_wakeup(hu);
 845 }
 846
 847 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 848  * two simultaneous tasklets.
 849  */
 850 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 851 {
 852         unsigned long flags = 0, idle_delay;
 853         struct qca_data *qca = hu->priv;
 854
 855         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 856                qca->tx_ibs_state);
 857
 858         if (test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
 859                 /* As SSR is in progress, ignore the packets */
 860                 bt_dev_dbg(hu->hdev, "SSR is in progress");
 861                 kfree_skb(skb);
 862                 return 0;
 863         }
 864
 865         /* Prepend skb with frame type */
 866         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 867
 868         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 869
 870         /* Don't go to sleep in middle of patch download or
 871          * Out-Of-Band(GPIOs control) sleep is selected.
 872          * Don't wake the device up when suspending.
 873          */
 874         if (!test_bit(QCA_IBS_ENABLED, &qca->flags) ||
 875             test_bit(QCA_SUSPENDING, &qca->flags)) {
 876                 skb_queue_tail(&qca->txq, skb);
 877                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 878                 return 0;
 879         }
 880
 881         /* Act according to current state */
 882         switch (qca->tx_ibs_state) {
 883         case HCI_IBS_TX_AWAKE:
 884                 BT_DBG("Device awake, sending normally");
 885                 skb_queue_tail(&qca->txq, skb);
 886                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 887                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 888                 break;
 889
 890         case HCI_IBS_TX_ASLEEP:
 891                 BT_DBG("Device asleep, waking up and queueing packet");
 892                 /* Save packet for later */
 893                 skb_queue_tail(&qca->tx_wait_q, skb);
 894
 895                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 896                 /* Schedule a work queue to wake up device */
 897                 queue_work(qca->workqueue, &qca->ws_awake_device);
 898                 break;
 899
 900         case HCI_IBS_TX_WAKING:
 901                 BT_DBG("Device waking up, queueing packet");
 902                 /* Transient state; just keep packet for later */
 903                 skb_queue_tail(&qca->tx_wait_q, skb);
 904                 break;
 905
 906         default:
 907                 BT_ERR("Illegal tx state: %d (losing packet)",
 908                        qca->tx_ibs_state);
 909                 kfree_skb(skb);
 910                 break;
 911         }
 912
 913         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 914
 915         return 0;
 916 }
 917
 918 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 919 {
 920         struct hci_uart *hu = hci_get_drvdata(hdev);
 921
 922         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 923
 924         device_want_to_sleep(hu);
 925
 926         kfree_skb(skb);
 927         return 0;
 928 }
 929
 930 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 931 {
 932         struct hci_uart *hu = hci_get_drvdata(hdev);
 933
 934         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 935
 936         device_want_to_wakeup(hu);
 937
 938         kfree_skb(skb);
 939         return 0;
 940 }
 941
 942 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 943 {
 944         struct hci_uart *hu = hci_get_drvdata(hdev);
 945
 946         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 947
 948         device_woke_up(hu);
 949
 950         kfree_skb(skb);
 951         return 0;
 952 }
 953
 954 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 955 {
 956         /* We receive debug logs from chip as an ACL packets.
 957          * Instead of sending the data to ACL to decode the
 958          * received data, we are pushing them to the above layers
 959          * as a diagnostic packet.
 960          */
 961         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 962                 return hci_recv_diag(hdev, skb);
 963
 964         return hci_recv_frame(hdev, skb);
 965 }
 966
 967 static void qca_controller_memdump(struct work_struct *work)
 968 {
 969         struct qca_data *qca = container_of(work, struct qca_data,
 970                                             ctrl_memdump_evt);
 971         struct hci_uart *hu = qca->hu;
 972         struct sk_buff *skb;
 973         struct qca_memdump_event_hdr *cmd_hdr;
 974         struct qca_memdump_data *qca_memdump = qca->qca_memdump;
 975         struct qca_dump_size *dump;
 976         char *memdump_buf;
 977         char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
 978         u16 seq_no;
 979         u32 dump_size;
 980         u32 rx_size;
 981         enum qca_btsoc_type soc_type = qca_soc_type(hu);
 982
 983         while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
 984
 985                 mutex_lock(&qca->hci_memdump_lock);
 986                 /* Skip processing the received packets if timeout detected
 987                  * or memdump collection completed.
 988                  */
 989                 if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
 990                     qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
 991                         mutex_unlock(&qca->hci_memdump_lock);
 992                         return;
 993                 }
 994
 995                 if (!qca_memdump) {
 996                         qca_memdump = kzalloc(sizeof(struct qca_memdump_data),
 997                                               GFP_ATOMIC);
 998                         if (!qca_memdump) {
 999                                 mutex_unlock(&qca->hci_memdump_lock);
1000                                 return;
1001                         }
1002
1003                         qca->qca_memdump = qca_memdump;
1004                 }
1005
1006                 qca->memdump_state = QCA_MEMDUMP_COLLECTING;
1007                 cmd_hdr = (void *) skb->data;
1008                 seq_no = __le16_to_cpu(cmd_hdr->seq_no);
1009                 skb_pull(skb, sizeof(struct qca_memdump_event_hdr));
1010
1011                 if (!seq_no) {
1012
1013                         /* This is the first frame of memdump packet from
1014                          * the controller, Disable IBS to recevie dump
1015                          * with out any interruption, ideally time required for
1016                          * the controller to send the dump is 8 seconds. let us
1017                          * start timer to handle this asynchronous activity.
1018                          */
1019                         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1020                         set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1021                         dump = (void *) skb->data;
1022                         dump_size = __le32_to_cpu(dump->dump_size);
1023                         if (!(dump_size)) {
1024                                 bt_dev_err(hu->hdev, "Rx invalid memdump size");
1025                                 kfree_skb(skb);
1026                                 mutex_unlock(&qca->hci_memdump_lock);
1027                                 return;
1028                         }
1029
1030                         bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
1031                                     dump_size);
1032                         queue_delayed_work(qca->workqueue,
1033                                            &qca->ctrl_memdump_timeout,
1034                                            msecs_to_jiffies(MEMDUMP_TIMEOUT_MS)
1035                                           );
1036
1037                         skb_pull(skb, sizeof(dump_size));
1038                         memdump_buf = vmalloc(dump_size);
1039                         qca_memdump->ram_dump_size = dump_size;
1040                         qca_memdump->memdump_buf_head = memdump_buf;
1041                         qca_memdump->memdump_buf_tail = memdump_buf;
1042                 }
1043
1044                 memdump_buf = qca_memdump->memdump_buf_tail;
1045
1046                 /* If sequence no 0 is missed then there is no point in
1047                  * accepting the other sequences.
1048                  */
1049                 if (!memdump_buf) {
1050                         bt_dev_err(hu->hdev, "QCA: Discarding other packets");
1051                         kfree(qca_memdump);
1052                         kfree_skb(skb);
1053                         qca->qca_memdump = NULL;
1054                         mutex_unlock(&qca->hci_memdump_lock);
1055                         return;
1056                 }
1057
1058                 /* There could be chance of missing some packets from
1059                  * the controller. In such cases let us store the dummy
1060                  * packets in the buffer.
1061                  */
1062                 /* For QCA6390, controller does not lost packets but
1063                  * sequence number field of packat sometimes has error
1064                  * bits, so skip this checking for missing packet.
1065                  */
1066                 while ((seq_no > qca_memdump->current_seq_no + 1) &&
1067                        (soc_type != QCA_QCA6390) &&
1068                        seq_no != QCA_LAST_SEQUENCE_NUM) {
1069                         bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
1070                                    qca_memdump->current_seq_no);
1071                         rx_size = qca_memdump->received_dump;
1072                         rx_size += QCA_DUMP_PACKET_SIZE;
1073                         if (rx_size > qca_memdump->ram_dump_size) {
1074                                 bt_dev_err(hu->hdev,
1075                                            "QCA memdump received %d, no space for missed packet",
1076                                            qca_memdump->received_dump);
1077                                 break;
1078                         }
1079                         memcpy(memdump_buf, nullBuff, QCA_DUMP_PACKET_SIZE);
1080                         memdump_buf = memdump_buf + QCA_DUMP_PACKET_SIZE;
1081                         qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
1082                         qca_memdump->current_seq_no++;
1083                 }
1084
1085                 rx_size = qca_memdump->received_dump + skb->len;
1086                 if (rx_size <= qca_memdump->ram_dump_size) {
1087                         if ((seq_no != QCA_LAST_SEQUENCE_NUM) &&
1088                             (seq_no != qca_memdump->current_seq_no))
1089                                 bt_dev_err(hu->hdev,
1090                                            "QCA memdump unexpected packet %d",
1091                                            seq_no);
1092                         bt_dev_dbg(hu->hdev,
1093                                    "QCA memdump packet %d with length %d",
1094                                    seq_no, skb->len);
1095                         memcpy(memdump_buf, (unsigned char *)skb->data,
1096                                skb->len);
1097                         memdump_buf = memdump_buf + skb->len;
1098                         qca_memdump->memdump_buf_tail = memdump_buf;
1099                         qca_memdump->current_seq_no = seq_no + 1;
1100                         qca_memdump->received_dump += skb->len;
1101                 } else {
1102                         bt_dev_err(hu->hdev,
1103                                    "QCA memdump received %d, no space for packet %d",
1104                                    qca_memdump->received_dump, seq_no);
1105                 }
1106                 qca->qca_memdump = qca_memdump;
1107                 kfree_skb(skb);
1108                 if (seq_no == QCA_LAST_SEQUENCE_NUM) {
1109                         bt_dev_info(hu->hdev,
1110                                     "QCA memdump Done, received %d, total %d",
1111                                     qca_memdump->received_dump,
1112                                     qca_memdump->ram_dump_size);
1113                         memdump_buf = qca_memdump->memdump_buf_head;
1114                         dev_coredumpv(&hu->serdev->dev, memdump_buf,
1115                                       qca_memdump->received_dump, GFP_KERNEL);
1116                         cancel_delayed_work(&qca->ctrl_memdump_timeout);
1117                         kfree(qca->qca_memdump);
1118                         qca->qca_memdump = NULL;
1119                         qca->memdump_state = QCA_MEMDUMP_COLLECTED;
1120                         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1121                 }
1122
1123                 mutex_unlock(&qca->hci_memdump_lock);
1124         }
1125
1126 }
1127
1128 static int qca_controller_memdump_event(struct hci_dev *hdev,
1129                                         struct sk_buff *skb)
1130 {
1131         struct hci_uart *hu = hci_get_drvdata(hdev);
1132         struct qca_data *qca = hu->priv;
1133
1134         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1135         skb_queue_tail(&qca->rx_memdump_q, skb);
1136         queue_work(qca->workqueue, &qca->ctrl_memdump_evt);
1137
1138         return 0;
1139 }
1140
1141 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
1142 {
1143         struct hci_uart *hu = hci_get_drvdata(hdev);
1144         struct qca_data *qca = hu->priv;
1145
1146         if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
1147                 struct hci_event_hdr *hdr = (void *)skb->data;
1148
1149                 /* For the WCN3990 the vendor command for a baudrate change
1150                  * isn't sent as synchronous HCI command, because the
1151                  * controller sends the corresponding vendor event with the
1152                  * new baudrate. The event is received and properly decoded
1153                  * after changing the baudrate of the host port. It needs to
1154                  * be dropped, otherwise it can be misinterpreted as
1155                  * response to a later firmware download command (also a
1156                  * vendor command).
1157                  */
1158
1159                 if (hdr->evt == HCI_EV_VENDOR)
1160                         complete(&qca->drop_ev_comp);
1161
1162                 kfree_skb(skb);
1163
1164                 return 0;
1165         }
1166         /* We receive chip memory dump as an event packet, With a dedicated
1167          * handler followed by a hardware error event. When this event is
1168          * received we store dump into a file before closing hci. This
1169          * dump will help in triaging the issues.
1170          */
1171         if ((skb->data[0] == HCI_VENDOR_PKT) &&
1172             (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
1173                 return qca_controller_memdump_event(hdev, skb);
1174
1175         return hci_recv_frame(hdev, skb);
1176 }
1177
1178 #define QCA_IBS_SLEEP_IND_EVENT \
1179         .type = HCI_IBS_SLEEP_IND, \
1180         .hlen = 0, \
1181         .loff = 0, \
1182         .lsize = 0, \
1183         .maxlen = HCI_MAX_IBS_SIZE
1184
1185 #define QCA_IBS_WAKE_IND_EVENT \
1186         .type = HCI_IBS_WAKE_IND, \
1187         .hlen = 0, \
1188         .loff = 0, \
1189         .lsize = 0, \
1190         .maxlen = HCI_MAX_IBS_SIZE
1191
1192 #define QCA_IBS_WAKE_ACK_EVENT \
1193         .type = HCI_IBS_WAKE_ACK, \
1194         .hlen = 0, \
1195         .loff = 0, \
1196         .lsize = 0, \
1197         .maxlen = HCI_MAX_IBS_SIZE
1198
1199 static const struct h4_recv_pkt qca_recv_pkts[] = {
1200         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
1201         { H4_RECV_SCO,             .recv = hci_recv_frame    },
1202         { H4_RECV_EVENT,           .recv = qca_recv_event    },
1203         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
1204         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
1205         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
1206 };
1207
1208 static int qca_recv(struct hci_uart *hu, const void *data, int count)
1209 {
1210         struct qca_data *qca = hu->priv;
1211
1212         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
1213                 return -EUNATCH;
1214
1215         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
1216                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
1217         if (IS_ERR(qca->rx_skb)) {
1218                 int err = PTR_ERR(qca->rx_skb);
1219                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
1220                 qca->rx_skb = NULL;
1221                 return err;
1222         }
1223
1224         return count;
1225 }
1226
1227 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
1228 {
1229         struct qca_data *qca = hu->priv;
1230
1231         return skb_dequeue(&qca->txq);
1232 }
1233
1234 static uint8_t qca_get_baudrate_value(int speed)
1235 {
1236         switch (speed) {
1237         case 9600:
1238                 return QCA_BAUDRATE_9600;
1239         case 19200:
1240                 return QCA_BAUDRATE_19200;
1241         case 38400:
1242                 return QCA_BAUDRATE_38400;
1243         case 57600:
1244                 return QCA_BAUDRATE_57600;
1245         case 115200:
1246                 return QCA_BAUDRATE_115200;
1247         case 230400:
1248                 return QCA_BAUDRATE_230400;
1249         case 460800:
1250                 return QCA_BAUDRATE_460800;
1251         case 500000:
1252                 return QCA_BAUDRATE_500000;
1253         case 921600:
1254                 return QCA_BAUDRATE_921600;
1255         case 1000000:
1256                 return QCA_BAUDRATE_1000000;
1257         case 2000000:
1258                 return QCA_BAUDRATE_2000000;
1259         case 3000000:
1260                 return QCA_BAUDRATE_3000000;
1261         case 3200000:
1262                 return QCA_BAUDRATE_3200000;
1263         case 3500000:
1264                 return QCA_BAUDRATE_3500000;
1265         default:
1266                 return QCA_BAUDRATE_115200;
1267         }
1268 }
1269
1270 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
1271 {
1272         struct hci_uart *hu = hci_get_drvdata(hdev);
1273         struct qca_data *qca = hu->priv;
1274         struct sk_buff *skb;
1275         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
1276
1277         if (baudrate > QCA_BAUDRATE_3200000)
1278                 return -EINVAL;
1279
1280         cmd[4] = baudrate;
1281
1282         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1283         if (!skb) {
1284                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
1285                 return -ENOMEM;
1286         }
1287
1288         /* Assign commands to change baudrate and packet type. */
1289         skb_put_data(skb, cmd, sizeof(cmd));
1290         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1291
1292         skb_queue_tail(&qca->txq, skb);
1293         hci_uart_tx_wakeup(hu);
1294
1295         /* Wait for the baudrate change request to be sent */
1296
1297         while (!skb_queue_empty(&qca->txq))
1298                 usleep_range(100, 200);
1299
1300         if (hu->serdev)
1301                 serdev_device_wait_until_sent(hu->serdev,
1302                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1303
1304         /* Give the controller time to process the request */
1305         if (qca_is_wcn399x(qca_soc_type(hu)))
1306                 msleep(10);
1307         else
1308                 msleep(300);
1309
1310         return 0;
1311 }
1312
1313 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1314 {
1315         if (hu->serdev)
1316                 serdev_device_set_baudrate(hu->serdev, speed);
1317         else
1318                 hci_uart_set_baudrate(hu, speed);
1319 }
1320
1321 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1322 {
1323         int ret;
1324         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1325         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1326
1327         /* These power pulses are single byte command which are sent
1328          * at required baudrate to wcn3990. On wcn3990, we have an external
1329          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1330          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1331          * and also we use the same power inputs to turn on and off for
1332          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1333          * we send a power on pulse at 115200 bps. This algorithm will help to
1334          * save power. Disabling hardware flow control is mandatory while
1335          * sending power pulses to SoC.
1336          */
1337         bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1338
1339         serdev_device_write_flush(hu->serdev);
1340         hci_uart_set_flow_control(hu, true);
1341         ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1342         if (ret < 0) {
1343                 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1344                 return ret;
1345         }
1346
1347         serdev_device_wait_until_sent(hu->serdev, timeout);
1348         hci_uart_set_flow_control(hu, false);
1349
1350         /* Give to controller time to boot/shutdown */
1351         if (on)
1352                 msleep(100);
1353         else
1354                 msleep(10);
1355
1356         return 0;
1357 }
1358
1359 static unsigned int qca_get_speed(struct hci_uart *hu,
1360                                   enum qca_speed_type speed_type)
1361 {
1362         unsigned int speed = 0;
1363
1364         if (speed_type == QCA_INIT_SPEED) {
1365                 if (hu->init_speed)
1366                         speed = hu->init_speed;
1367                 else if (hu->proto->init_speed)
1368                         speed = hu->proto->init_speed;
1369         } else {
1370                 if (hu->oper_speed)
1371                         speed = hu->oper_speed;
1372                 else if (hu->proto->oper_speed)
1373                         speed = hu->proto->oper_speed;
1374         }
1375
1376         return speed;
1377 }
1378
1379 static int qca_check_speeds(struct hci_uart *hu)
1380 {
1381         if (qca_is_wcn399x(qca_soc_type(hu))) {
1382                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1383                     !qca_get_speed(hu, QCA_OPER_SPEED))
1384                         return -EINVAL;
1385         } else {
1386                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1387                     !qca_get_speed(hu, QCA_OPER_SPEED))
1388                         return -EINVAL;
1389         }
1390
1391         return 0;
1392 }
1393
1394 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1395 {
1396         unsigned int speed, qca_baudrate;
1397         struct qca_data *qca = hu->priv;
1398         int ret = 0;
1399
1400         if (speed_type == QCA_INIT_SPEED) {
1401                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1402                 if (speed)
1403                         host_set_baudrate(hu, speed);
1404         } else {
1405                 enum qca_btsoc_type soc_type = qca_soc_type(hu);
1406
1407                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1408                 if (!speed)
1409                         return 0;
1410
1411                 /* Disable flow control for wcn3990 to deassert RTS while
1412                  * changing the baudrate of chip and host.
1413                  */
1414                 if (qca_is_wcn399x(soc_type))
1415                         hci_uart_set_flow_control(hu, true);
1416
1417                 if (soc_type == QCA_WCN3990) {
1418                         reinit_completion(&qca->drop_ev_comp);
1419                         set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1420                 }
1421
1422                 qca_baudrate = qca_get_baudrate_value(speed);
1423                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1424                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1425                 if (ret)
1426                         goto error;
1427
1428                 host_set_baudrate(hu, speed);
1429
1430 error:
1431                 if (qca_is_wcn399x(soc_type))
1432                         hci_uart_set_flow_control(hu, false);
1433
1434                 if (soc_type == QCA_WCN3990) {
1435                         /* Wait for the controller to send the vendor event
1436                          * for the baudrate change command.
1437                          */
1438                         if (!wait_for_completion_timeout(&qca->drop_ev_comp,
1439                                                  msecs_to_jiffies(100))) {
1440                                 bt_dev_err(hu->hdev,
1441                                            "Failed to change controller baudrate\n");
1442                                 ret = -ETIMEDOUT;
1443                         }
1444
1445                         clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1446                 }
1447         }
1448
1449         return ret;
1450 }
1451
1452 static int qca_send_crashbuffer(struct hci_uart *hu)
1453 {
1454         struct qca_data *qca = hu->priv;
1455         struct sk_buff *skb;
1456
1457         skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
1458         if (!skb) {
1459                 bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
1460                 return -ENOMEM;
1461         }
1462
1463         /* We forcefully crash the controller, by sending 0xfb byte for
1464          * 1024 times. We also might have chance of losing data, To be
1465          * on safer side we send 1096 bytes to the SoC.
1466          */
1467         memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
1468                QCA_CRASHBYTE_PACKET_LEN);
1469         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1470         bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
1471         skb_queue_tail(&qca->txq, skb);
1472         hci_uart_tx_wakeup(hu);
1473
1474         return 0;
1475 }
1476
1477 static void qca_wait_for_dump_collection(struct hci_dev *hdev)
1478 {
1479         struct hci_uart *hu = hci_get_drvdata(hdev);
1480         struct qca_data *qca = hu->priv;
1481
1482         wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
1483                             TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);
1484
1485         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1486 }
1487
1488 static void qca_hw_error(struct hci_dev *hdev, u8 code)
1489 {
1490         struct hci_uart *hu = hci_get_drvdata(hdev);
1491         struct qca_data *qca = hu->priv;
1492
1493         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1494         set_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1495         bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);
1496
1497         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1498                 /* If hardware error event received for other than QCA
1499                  * soc memory dump event, then we need to crash the SOC
1500                  * and wait here for 8 seconds to get the dump packets.
1501                  * This will block main thread to be on hold until we
1502                  * collect dump.
1503                  */
1504                 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1505                 qca_send_crashbuffer(hu);
1506                 qca_wait_for_dump_collection(hdev);
1507         } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1508                 /* Let us wait here until memory dump collected or
1509                  * memory dump timer expired.
1510                  */
1511                 bt_dev_info(hdev, "waiting for dump to complete");
1512                 qca_wait_for_dump_collection(hdev);
1513         }
1514
1515         mutex_lock(&qca->hci_memdump_lock);
1516         if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1517                 bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
1518                 if (qca->qca_memdump) {
1519                         vfree(qca->qca_memdump->memdump_buf_head);
1520                         kfree(qca->qca_memdump);
1521                         qca->qca_memdump = NULL;
1522                 }
1523                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1524                 cancel_delayed_work(&qca->ctrl_memdump_timeout);
1525         }
1526         mutex_unlock(&qca->hci_memdump_lock);
1527
1528         if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
1529             qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
1530                 cancel_work_sync(&qca->ctrl_memdump_evt);
1531                 skb_queue_purge(&qca->rx_memdump_q);
1532         }
1533
1534         clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1535 }
1536
1537 static void qca_cmd_timeout(struct hci_dev *hdev)
1538 {
1539         struct hci_uart *hu = hci_get_drvdata(hdev);
1540         struct qca_data *qca = hu->priv;
1541
1542         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1543         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1544                 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1545                 qca_send_crashbuffer(hu);
1546                 qca_wait_for_dump_collection(hdev);
1547         } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1548                 /* Let us wait here until memory dump collected or
1549                  * memory dump timer expired.
1550                  */
1551                 bt_dev_info(hdev, "waiting for dump to complete");
1552                 qca_wait_for_dump_collection(hdev);
1553         }
1554
1555         mutex_lock(&qca->hci_memdump_lock);
1556         if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1557                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1558                 if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
1559                         /* Inject hw error event to reset the device
1560                          * and driver.
1561                          */
1562                         hci_reset_dev(hu->hdev);
1563                 }
1564         }
1565         mutex_unlock(&qca->hci_memdump_lock);
1566 }
1567
1568 static int qca_wcn3990_init(struct hci_uart *hu)
1569 {
1570         struct qca_serdev *qcadev;
1571         int ret;
1572
1573         /* Check for vregs status, may be hci down has turned
1574          * off the voltage regulator.
1575          */
1576         qcadev = serdev_device_get_drvdata(hu->serdev);
1577         if (!qcadev->bt_power->vregs_on) {
1578                 serdev_device_close(hu->serdev);
1579                 ret = qca_regulator_enable(qcadev);
1580                 if (ret)
1581                         return ret;
1582
1583                 ret = serdev_device_open(hu->serdev);
1584                 if (ret) {
1585                         bt_dev_err(hu->hdev, "failed to open port");
1586                         return ret;
1587                 }
1588         }
1589
1590         /* Forcefully enable wcn3990 to enter in to boot mode. */
1591         host_set_baudrate(hu, 2400);
1592         ret = qca_send_power_pulse(hu, false);
1593         if (ret)
1594                 return ret;
1595
1596         qca_set_speed(hu, QCA_INIT_SPEED);
1597         ret = qca_send_power_pulse(hu, true);
1598         if (ret)
1599                 return ret;
1600
1601         /* Now the device is in ready state to communicate with host.
1602          * To sync host with device we need to reopen port.
1603          * Without this, we will have RTS and CTS synchronization
1604          * issues.
1605          */
1606         serdev_device_close(hu->serdev);
1607         ret = serdev_device_open(hu->serdev);
1608         if (ret) {
1609                 bt_dev_err(hu->hdev, "failed to open port");
1610                 return ret;
1611         }
1612
1613         hci_uart_set_flow_control(hu, false);
1614
1615         return 0;
1616 }
1617
1618 static int qca_power_on(struct hci_dev *hdev)
1619 {
1620         struct hci_uart *hu = hci_get_drvdata(hdev);
1621         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1622         struct qca_serdev *qcadev;
1623         int ret = 0;
1624
1625         /* Non-serdev device usually is powered by external power
1626          * and don't need additional action in driver for power on
1627          */
1628         if (!hu->serdev)
1629                 return 0;
1630
1631         if (qca_is_wcn399x(soc_type)) {
1632                 ret = qca_wcn3990_init(hu);
1633         } else {
1634                 qcadev = serdev_device_get_drvdata(hu->serdev);
1635                 if (qcadev->bt_en) {
1636                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
1637                         /* Controller needs time to bootup. */
1638                         msleep(150);
1639                 }
1640         }
1641
1642         return ret;
1643 }
1644
1645 static int qca_setup(struct hci_uart *hu)
1646 {
1647         struct hci_dev *hdev = hu->hdev;
1648         struct qca_data *qca = hu->priv;
1649         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1650         unsigned int retries = 0;
1651         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1652         const char *firmware_name = qca_get_firmware_name(hu);
1653         int ret;
1654         int soc_ver = 0;
1655
1656         ret = qca_check_speeds(hu);
1657         if (ret)
1658                 return ret;
1659
1660         /* Patch downloading has to be done without IBS mode */
1661         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1662
1663         /* Enable controller to do both LE scan and BR/EDR inquiry
1664          * simultaneously.
1665          */
1666         set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
1667
1668         bt_dev_info(hdev, "setting up %s",
1669                 qca_is_wcn399x(soc_type) ? "wcn399x" : "ROME/QCA6390");
1670
1671         qca->memdump_state = QCA_MEMDUMP_IDLE;
1672
1673 retry:
1674         ret = qca_power_on(hdev);
1675         if (ret)
1676                 return ret;
1677
1678         clear_bit(QCA_SSR_TRIGGERED, &qca->flags);
1679
1680         if (qca_is_wcn399x(soc_type)) {
1681                 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1682
1683                 ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
1684                 if (ret)
1685                         return ret;
1686         } else {
1687                 qca_set_speed(hu, QCA_INIT_SPEED);
1688         }
1689
1690         /* Setup user speed if needed */
1691         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1692         if (speed) {
1693                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1694                 if (ret)
1695                         return ret;
1696
1697                 qca_baudrate = qca_get_baudrate_value(speed);
1698         }
1699
1700         if (!qca_is_wcn399x(soc_type)) {
1701                 /* Get QCA version information */
1702                 ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
1703                 if (ret)
1704                         return ret;
1705         }
1706
1707         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1708         /* Setup patch / NVM configurations */
1709         ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver,
1710                         firmware_name);
1711         if (!ret) {
1712                 set_bit(QCA_IBS_ENABLED, &qca->flags);
1713                 qca_debugfs_init(hdev);
1714                 hu->hdev->hw_error = qca_hw_error;
1715                 hu->hdev->cmd_timeout = qca_cmd_timeout;
1716         } else if (ret == -ENOENT) {
1717                 /* No patch/nvm-config found, run with original fw/config */
1718                 ret = 0;
1719         } else if (ret == -EAGAIN) {
1720                 /*
1721                  * Userspace firmware loader will return -EAGAIN in case no
1722                  * patch/nvm-config is found, so run with original fw/config.
1723                  */
1724                 ret = 0;
1725         } else {
1726                 if (retries < MAX_INIT_RETRIES) {
1727                         qca_power_shutdown(hu);
1728                         if (hu->serdev) {
1729                                 serdev_device_close(hu->serdev);
1730                                 ret = serdev_device_open(hu->serdev);
1731                                 if (ret) {
1732                                         bt_dev_err(hdev, "failed to open port");
1733                                         return ret;
1734                                 }
1735                         }
1736                         retries++;
1737                         goto retry;
1738                 }
1739         }
1740
1741         /* Setup bdaddr */
1742         if (soc_type == QCA_ROME)
1743                 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1744         else
1745                 hu->hdev->set_bdaddr = qca_set_bdaddr;
1746
1747         return ret;
1748 }
1749
1750 static const struct hci_uart_proto qca_proto = {
1751         .id             = HCI_UART_QCA,
1752         .name           = "QCA",
1753         .manufacturer   = 29,
1754         .init_speed     = 115200,
1755         .oper_speed     = 3000000,
1756         .open           = qca_open,
1757         .close          = qca_close,
1758         .flush          = qca_flush,
1759         .setup          = qca_setup,
1760         .recv           = qca_recv,
1761         .enqueue        = qca_enqueue,
1762         .dequeue        = qca_dequeue,
1763 };
1764
1765 static const struct qca_device_data qca_soc_data_wcn3990 = {
1766         .soc_type = QCA_WCN3990,
1767         .vregs = (struct qca_vreg []) {
1768                 { "vddio", 15000  },
1769                 { "vddxo", 80000  },
1770                 { "vddrf", 300000 },
1771                 { "vddch0", 450000 },
1772         },
1773         .num_vregs = 4,
1774 };
1775
1776 static const struct qca_device_data qca_soc_data_wcn3991 = {
1777         .soc_type = QCA_WCN3991,
1778         .vregs = (struct qca_vreg []) {
1779                 { "vddio", 15000  },
1780                 { "vddxo", 80000  },
1781                 { "vddrf", 300000 },
1782                 { "vddch0", 450000 },
1783         },
1784         .num_vregs = 4,
1785         .capabilities = QCA_CAP_WIDEBAND_SPEECH,
1786 };
1787
1788 static const struct qca_device_data qca_soc_data_wcn3998 = {
1789         .soc_type = QCA_WCN3998,
1790         .vregs = (struct qca_vreg []) {
1791                 { "vddio", 10000  },
1792                 { "vddxo", 80000  },
1793                 { "vddrf", 300000 },
1794                 { "vddch0", 450000 },
1795         },
1796         .num_vregs = 4,
1797 };
1798
1799 static const struct qca_device_data qca_soc_data_qca6390 = {
1800         .soc_type = QCA_QCA6390,
1801         .num_vregs = 0,
1802 };
1803
1804 static void qca_power_shutdown(struct hci_uart *hu)
1805 {
1806         struct qca_serdev *qcadev;
1807         struct qca_data *qca = hu->priv;
1808         unsigned long flags;
1809         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1810
1811         qcadev = serdev_device_get_drvdata(hu->serdev);
1812
1813         /* From this point we go into power off state. But serial port is
1814          * still open, stop queueing the IBS data and flush all the buffered
1815          * data in skb's.
1816          */
1817         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1818         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1819         qca_flush(hu);
1820         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1821
1822         /* Non-serdev device usually is powered by external power
1823          * and don't need additional action in driver for power down
1824          */
1825         if (!hu->serdev)
1826                 return;
1827
1828         if (qca_is_wcn399x(soc_type)) {
1829                 host_set_baudrate(hu, 2400);
1830                 qca_send_power_pulse(hu, false);
1831                 qca_regulator_disable(qcadev);
1832         } else if (qcadev->bt_en) {
1833                 gpiod_set_value_cansleep(qcadev->bt_en, 0);
1834         }
1835 }
1836
1837 static int qca_power_off(struct hci_dev *hdev)
1838 {
1839         struct hci_uart *hu = hci_get_drvdata(hdev);
1840         struct qca_data *qca = hu->priv;
1841         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1842
1843         hu->hdev->hw_error = NULL;
1844         hu->hdev->cmd_timeout = NULL;
1845
1846         /* Stop sending shutdown command if soc crashes. */
1847         if (soc_type != QCA_ROME
1848                 && qca->memdump_state == QCA_MEMDUMP_IDLE) {
1849                 qca_send_pre_shutdown_cmd(hdev);
1850                 usleep_range(8000, 10000);
1851         }
1852
1853         qca_power_shutdown(hu);
1854         return 0;
1855 }
1856
1857 static int qca_regulator_enable(struct qca_serdev *qcadev)
1858 {
1859         struct qca_power *power = qcadev->bt_power;
1860         int ret;
1861
1862         /* Already enabled */
1863         if (power->vregs_on)
1864                 return 0;
1865
1866         BT_DBG("enabling %d regulators)", power->num_vregs);
1867
1868         ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
1869         if (ret)
1870                 return ret;
1871
1872         power->vregs_on = true;
1873
1874         ret = clk_prepare_enable(qcadev->susclk);
1875         if (ret)
1876                 qca_regulator_disable(qcadev);
1877
1878         return ret;
1879 }
1880
1881 static void qca_regulator_disable(struct qca_serdev *qcadev)
1882 {
1883         struct qca_power *power;
1884
1885         if (!qcadev)
1886                 return;
1887
1888         power = qcadev->bt_power;
1889
1890         /* Already disabled? */
1891         if (!power->vregs_on)
1892                 return;
1893
1894         regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
1895         power->vregs_on = false;
1896
1897         clk_disable_unprepare(qcadev->susclk);
1898 }
1899
1900 static int qca_init_regulators(struct qca_power *qca,
1901                                 const struct qca_vreg *vregs, size_t num_vregs)
1902 {
1903         struct regulator_bulk_data *bulk;
1904         int ret;
1905         int i;
1906
1907         bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
1908         if (!bulk)
1909                 return -ENOMEM;
1910
1911         for (i = 0; i < num_vregs; i++)
1912                 bulk[i].supply = vregs[i].name;
1913
1914         ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
1915         if (ret < 0)
1916                 return ret;
1917
1918         for (i = 0; i < num_vregs; i++) {
1919                 ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
1920                 if (ret)
1921                         return ret;
1922         }
1923
1924         qca->vreg_bulk = bulk;
1925         qca->num_vregs = num_vregs;
1926
1927         return 0;
1928 }
1929
1930 static int qca_serdev_probe(struct serdev_device *serdev)
1931 {
1932         struct qca_serdev *qcadev;
1933         struct hci_dev *hdev;
1934         const struct qca_device_data *data;
1935         int err;
1936         bool power_ctrl_enabled = true;
1937
1938         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1939         if (!qcadev)
1940                 return -ENOMEM;
1941
1942         qcadev->serdev_hu.serdev = serdev;
1943         data = device_get_match_data(&serdev->dev);
1944         serdev_device_set_drvdata(serdev, qcadev);
1945         device_property_read_string(&serdev->dev, "firmware-name",
1946                                          &qcadev->firmware_name);
1947         device_property_read_u32(&serdev->dev, "max-speed",
1948                                  &qcadev->oper_speed);
1949         if (!qcadev->oper_speed)
1950                 BT_DBG("UART will pick default operating speed");
1951
1952         if (data && qca_is_wcn399x(data->soc_type)) {
1953                 qcadev->btsoc_type = data->soc_type;
1954                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1955                                                 sizeof(struct qca_power),
1956                                                 GFP_KERNEL);
1957                 if (!qcadev->bt_power)
1958                         return -ENOMEM;
1959
1960                 qcadev->bt_power->dev = &serdev->dev;
1961                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1962                                           data->num_vregs);
1963                 if (err) {
1964                         BT_ERR("Failed to init regulators:%d", err);
1965                         return err;
1966                 }
1967
1968                 qcadev->bt_power->vregs_on = false;
1969
1970                 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
1971                 if (IS_ERR(qcadev->susclk)) {
1972                         dev_err(&serdev->dev, "failed to acquire clk\n");
1973                         return PTR_ERR(qcadev->susclk);
1974                 }
1975
1976                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1977                 if (err) {
1978                         BT_ERR("wcn3990 serdev registration failed");
1979                         return err;
1980                 }
1981         } else {
1982                 if (data)
1983                         qcadev->btsoc_type = data->soc_type;
1984                 else
1985                         qcadev->btsoc_type = QCA_ROME;
1986
1987                 qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
1988                                                GPIOD_OUT_LOW);
1989                 if (!qcadev->bt_en) {
1990                         dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
1991                         power_ctrl_enabled = false;
1992                 }
1993
1994                 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
1995                 if (IS_ERR(qcadev->susclk)) {
1996                         dev_warn(&serdev->dev, "failed to acquire clk\n");
1997                         return PTR_ERR(qcadev->susclk);
1998                 }
1999                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
2000                 if (err)
2001                         return err;
2002
2003                 err = clk_prepare_enable(qcadev->susclk);
2004                 if (err)
2005                         return err;
2006
2007                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
2008                 if (err) {
2009                         BT_ERR("Rome serdev registration failed");
2010                         if (qcadev->susclk)
2011                                 clk_disable_unprepare(qcadev->susclk);
2012                         return err;
2013                 }
2014         }
2015
2016         hdev = qcadev->serdev_hu.hdev;
2017
2018         if (power_ctrl_enabled) {
2019                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
2020                 hdev->shutdown = qca_power_off;
2021         }
2022
2023         /* Wideband speech support must be set per driver since it can't be
2024          * queried via hci.
2025          */
2026         if (data && (data->capabilities & QCA_CAP_WIDEBAND_SPEECH))
2027                 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
2028
2029         return 0;
2030 }
2031
2032 static void qca_serdev_remove(struct serdev_device *serdev)
2033 {
2034         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2035
2036         if (qca_is_wcn399x(qcadev->btsoc_type))
2037                 qca_power_shutdown(&qcadev->serdev_hu);
2038         else if (qcadev->susclk)
2039                 clk_disable_unprepare(qcadev->susclk);
2040
2041         hci_uart_unregister_device(&qcadev->serdev_hu);
2042 }
2043
2044 static void qca_serdev_shutdown(struct device *dev)
2045 {
2046         int ret;
2047         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
2048         struct serdev_device *serdev = to_serdev_device(dev);
2049         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2050         const u8 ibs_wake_cmd[] = { 0xFD };
2051         const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 };
2052
2053         if (qcadev->btsoc_type == QCA_QCA6390) {
2054                 serdev_device_write_flush(serdev);
2055                 ret = serdev_device_write_buf(serdev, ibs_wake_cmd,
2056                                               sizeof(ibs_wake_cmd));
2057                 if (ret < 0) {
2058                         BT_ERR("QCA send IBS_WAKE_IND error: %d", ret);
2059                         return;
2060                 }
2061                 serdev_device_wait_until_sent(serdev, timeout);
2062                 usleep_range(8000, 10000);
2063
2064                 serdev_device_write_flush(serdev);
2065                 ret = serdev_device_write_buf(serdev, edl_reset_soc_cmd,
2066                                               sizeof(edl_reset_soc_cmd));
2067                 if (ret < 0) {
2068                         BT_ERR("QCA send EDL_RESET_REQ error: %d", ret);
2069                         return;
2070                 }
2071                 serdev_device_wait_until_sent(serdev, timeout);
2072                 usleep_range(8000, 10000);
2073         }
2074 }
2075
2076 static int __maybe_unused qca_suspend(struct device *dev)
2077 {
2078         struct serdev_device *serdev = to_serdev_device(dev);
2079         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2080         struct hci_uart *hu = &qcadev->serdev_hu;
2081         struct qca_data *qca = hu->priv;
2082         unsigned long flags;
2083         bool tx_pending = false;
2084         int ret = 0;
2085         u8 cmd;
2086
2087         set_bit(QCA_SUSPENDING, &qca->flags);
2088
2089         /* Device is downloading patch or doesn't support in-band sleep. */
2090         if (!test_bit(QCA_IBS_ENABLED, &qca->flags))
2091                 return 0;
2092
2093         cancel_work_sync(&qca->ws_awake_device);
2094         cancel_work_sync(&qca->ws_awake_rx);
2095
2096         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
2097                                  flags, SINGLE_DEPTH_NESTING);
2098
2099         switch (qca->tx_ibs_state) {
2100         case HCI_IBS_TX_WAKING:
2101                 del_timer(&qca->wake_retrans_timer);
2102                 fallthrough;
2103         case HCI_IBS_TX_AWAKE:
2104                 del_timer(&qca->tx_idle_timer);
2105
2106                 serdev_device_write_flush(hu->serdev);
2107                 cmd = HCI_IBS_SLEEP_IND;
2108                 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
2109
2110                 if (ret < 0) {
2111                         BT_ERR("Failed to send SLEEP to device");
2112                         break;
2113                 }
2114
2115                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
2116                 qca->ibs_sent_slps++;
2117                 tx_pending = true;
2118                 break;
2119
2120         case HCI_IBS_TX_ASLEEP:
2121                 break;
2122
2123         default:
2124                 BT_ERR("Spurious tx state %d", qca->tx_ibs_state);
2125                 ret = -EINVAL;
2126                 break;
2127         }
2128
2129         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
2130
2131         if (ret < 0)
2132                 goto error;
2133
2134         if (tx_pending) {
2135                 serdev_device_wait_until_sent(hu->serdev,
2136                                               msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
2137                 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
2138         }
2139
2140         /* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going
2141          * to sleep, so that the packet does not wake the system later.
2142          */
2143         ret = wait_event_interruptible_timeout(qca->suspend_wait_q,
2144                         qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
2145                         msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
2146         if (ret == 0) {
2147                 ret = -ETIMEDOUT;
2148                 goto error;
2149         }
2150
2151         return 0;
2152
2153 error:
2154         clear_bit(QCA_SUSPENDING, &qca->flags);
2155
2156         return ret;
2157 }
2158
2159 static int __maybe_unused qca_resume(struct device *dev)
2160 {
2161         struct serdev_device *serdev = to_serdev_device(dev);
2162         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2163         struct hci_uart *hu = &qcadev->serdev_hu;
2164         struct qca_data *qca = hu->priv;
2165
2166         clear_bit(QCA_SUSPENDING, &qca->flags);
2167
2168         return 0;
2169 }
2170
2171 static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume);
2172
2173 #ifdef CONFIG_OF
2174 static const struct of_device_id qca_bluetooth_of_match[] = {
2175         { .compatible = "qcom,qca6174-bt" },
2176         { .compatible = "qcom,qca6390-bt", .data = &qca_soc_data_qca6390},
2177         { .compatible = "qcom,qca9377-bt" },
2178         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
2179         { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
2180         { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
2181         { /* sentinel */ }
2182 };
2183 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
2184 #endif
2185
2186 #ifdef CONFIG_ACPI
2187 static const struct acpi_device_id qca_bluetooth_acpi_match[] = {
2188         { "QCOM6390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2189         { "DLA16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2190         { "DLB16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2191         { "DLB26390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2192         { },
2193 };
2194 MODULE_DEVICE_TABLE(acpi, qca_bluetooth_acpi_match);
2195 #endif
2196
2197
2198 static struct serdev_device_driver qca_serdev_driver = {
2199         .probe = qca_serdev_probe,
2200         .remove = qca_serdev_remove,
2201         .driver = {
2202                 .name = "hci_uart_qca",
2203                 .of_match_table = of_match_ptr(qca_bluetooth_of_match),
2204                 .acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
2205                 .shutdown = qca_serdev_shutdown,
2206                 .pm = &qca_pm_ops,
2207         },
2208 };
2209
2210 int __init qca_init(void)
2211 {
2212         serdev_device_driver_register(&qca_serdev_driver);
2213
2214         return hci_uart_register_proto(&qca_proto);
2215 }
2216
2217 int __exit qca_deinit(void)
2218 {
2219         serdev_device_driver_unregister(&qca_serdev_driver);
2220
2221         return hci_uart_unregister_proto(&qca_proto);
2222 }