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         kfree_skb(qca->rx_skb);
 697
 698         hu->priv = NULL;
 699
 700         kfree(qca);
 701
 702         return 0;
 703 }
 704
 705 /* Called upon a wake-up-indication from the device.
 706  */
 707 static void device_want_to_wakeup(struct hci_uart *hu)
 708 {
 709         unsigned long flags;
 710         struct qca_data *qca = hu->priv;
 711
 712         BT_DBG("hu %p want to wake up", hu);
 713
 714         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 715
 716         qca->ibs_recv_wakes++;
 717
 718         /* Don't wake the rx up when suspending. */
 719         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 720                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 721                 return;
 722         }
 723
 724         switch (qca->rx_ibs_state) {
 725         case HCI_IBS_RX_ASLEEP:
 726                 /* Make sure clock is on - we may have turned clock off since
 727                  * receiving the wake up indicator awake rx clock.
 728                  */
 729                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 730                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 731                 return;
 732
 733         case HCI_IBS_RX_AWAKE:
 734                 /* Always acknowledge device wake up,
 735                  * sending IBS message doesn't count as TX ON.
 736                  */
 737                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 738                         BT_ERR("Failed to acknowledge device wake up");
 739                         break;
 740                 }
 741                 qca->ibs_sent_wacks++;
 742                 break;
 743
 744         default:
 745                 /* Any other state is illegal */
 746                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 747                        qca->rx_ibs_state);
 748                 break;
 749         }
 750
 751         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 752
 753         /* Actually send the packets */
 754         hci_uart_tx_wakeup(hu);
 755 }
 756
 757 /* Called upon a sleep-indication from the device.
 758  */
 759 static void device_want_to_sleep(struct hci_uart *hu)
 760 {
 761         unsigned long flags;
 762         struct qca_data *qca = hu->priv;
 763
 764         BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);
 765
 766         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 767
 768         qca->ibs_recv_slps++;
 769
 770         switch (qca->rx_ibs_state) {
 771         case HCI_IBS_RX_AWAKE:
 772                 /* Update state */
 773                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 774                 /* Vote off rx clock under workqueue */
 775                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 776                 break;
 777
 778         case HCI_IBS_RX_ASLEEP:
 779                 break;
 780
 781         default:
 782                 /* Any other state is illegal */
 783                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 784                        qca->rx_ibs_state);
 785                 break;
 786         }
 787
 788         wake_up_interruptible(&qca->suspend_wait_q);
 789
 790         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 791 }
 792
 793 /* Called upon wake-up-acknowledgement from the device
 794  */
 795 static void device_woke_up(struct hci_uart *hu)
 796 {
 797         unsigned long flags, idle_delay;
 798         struct qca_data *qca = hu->priv;
 799         struct sk_buff *skb = NULL;
 800
 801         BT_DBG("hu %p woke up", hu);
 802
 803         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 804
 805         qca->ibs_recv_wacks++;
 806
 807         /* Don't react to the wake-up-acknowledgment when suspending. */
 808         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 809                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 810                 return;
 811         }
 812
 813         switch (qca->tx_ibs_state) {
 814         case HCI_IBS_TX_AWAKE:
 815                 /* Expect one if we send 2 WAKEs */
 816                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 817                        qca->tx_ibs_state);
 818                 break;
 819
 820         case HCI_IBS_TX_WAKING:
 821                 /* Send pending packets */
 822                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 823                         skb_queue_tail(&qca->txq, skb);
 824
 825                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 826                 del_timer(&qca->wake_retrans_timer);
 827                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 828                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 829                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 830                 break;
 831
 832         case HCI_IBS_TX_ASLEEP:
 833         default:
 834                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 835                        qca->tx_ibs_state);
 836                 break;
 837         }
 838
 839         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 840
 841         /* Actually send the packets */
 842         hci_uart_tx_wakeup(hu);
 843 }
 844
 845 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 846  * two simultaneous tasklets.
 847  */
 848 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 849 {
 850         unsigned long flags = 0, idle_delay;
 851         struct qca_data *qca = hu->priv;
 852
 853         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 854                qca->tx_ibs_state);
 855
 856         if (test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
 857                 /* As SSR is in progress, ignore the packets */
 858                 bt_dev_dbg(hu->hdev, "SSR is in progress");
 859                 kfree_skb(skb);
 860                 return 0;
 861         }
 862
 863         /* Prepend skb with frame type */
 864         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 865
 866         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 867
 868         /* Don't go to sleep in middle of patch download or
 869          * Out-Of-Band(GPIOs control) sleep is selected.
 870          * Don't wake the device up when suspending.
 871          */
 872         if (!test_bit(QCA_IBS_ENABLED, &qca->flags) ||
 873             test_bit(QCA_SUSPENDING, &qca->flags)) {
 874                 skb_queue_tail(&qca->txq, skb);
 875                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 876                 return 0;
 877         }
 878
 879         /* Act according to current state */
 880         switch (qca->tx_ibs_state) {
 881         case HCI_IBS_TX_AWAKE:
 882                 BT_DBG("Device awake, sending normally");
 883                 skb_queue_tail(&qca->txq, skb);
 884                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 885                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 886                 break;
 887
 888         case HCI_IBS_TX_ASLEEP:
 889                 BT_DBG("Device asleep, waking up and queueing packet");
 890                 /* Save packet for later */
 891                 skb_queue_tail(&qca->tx_wait_q, skb);
 892
 893                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 894                 /* Schedule a work queue to wake up device */
 895                 queue_work(qca->workqueue, &qca->ws_awake_device);
 896                 break;
 897
 898         case HCI_IBS_TX_WAKING:
 899                 BT_DBG("Device waking up, queueing packet");
 900                 /* Transient state; just keep packet for later */
 901                 skb_queue_tail(&qca->tx_wait_q, skb);
 902                 break;
 903
 904         default:
 905                 BT_ERR("Illegal tx state: %d (losing packet)",
 906                        qca->tx_ibs_state);
 907                 kfree_skb(skb);
 908                 break;
 909         }
 910
 911         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 912
 913         return 0;
 914 }
 915
 916 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 917 {
 918         struct hci_uart *hu = hci_get_drvdata(hdev);
 919
 920         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 921
 922         device_want_to_sleep(hu);
 923
 924         kfree_skb(skb);
 925         return 0;
 926 }
 927
 928 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 929 {
 930         struct hci_uart *hu = hci_get_drvdata(hdev);
 931
 932         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 933
 934         device_want_to_wakeup(hu);
 935
 936         kfree_skb(skb);
 937         return 0;
 938 }
 939
 940 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 941 {
 942         struct hci_uart *hu = hci_get_drvdata(hdev);
 943
 944         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 945
 946         device_woke_up(hu);
 947
 948         kfree_skb(skb);
 949         return 0;
 950 }
 951
 952 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 953 {
 954         /* We receive debug logs from chip as an ACL packets.
 955          * Instead of sending the data to ACL to decode the
 956          * received data, we are pushing them to the above layers
 957          * as a diagnostic packet.
 958          */
 959         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 960                 return hci_recv_diag(hdev, skb);
 961
 962         return hci_recv_frame(hdev, skb);
 963 }
 964
 965 static void qca_controller_memdump(struct work_struct *work)
 966 {
 967         struct qca_data *qca = container_of(work, struct qca_data,
 968                                             ctrl_memdump_evt);
 969         struct hci_uart *hu = qca->hu;
 970         struct sk_buff *skb;
 971         struct qca_memdump_event_hdr *cmd_hdr;
 972         struct qca_memdump_data *qca_memdump = qca->qca_memdump;
 973         struct qca_dump_size *dump;
 974         char *memdump_buf;
 975         char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
 976         u16 seq_no;
 977         u32 dump_size;
 978         u32 rx_size;
 979         enum qca_btsoc_type soc_type = qca_soc_type(hu);
 980
 981         while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
 982
 983                 mutex_lock(&qca->hci_memdump_lock);
 984                 /* Skip processing the received packets if timeout detected
 985                  * or memdump collection completed.
 986                  */
 987                 if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
 988                     qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
 989                         mutex_unlock(&qca->hci_memdump_lock);
 990                         return;
 991                 }
 992
 993                 if (!qca_memdump) {
 994                         qca_memdump = kzalloc(sizeof(struct qca_memdump_data),
 995                                               GFP_ATOMIC);
 996                         if (!qca_memdump) {
 997                                 mutex_unlock(&qca->hci_memdump_lock);
 998                                 return;
 999                         }
1000
1001                         qca->qca_memdump = qca_memdump;
1002                 }
1003
1004                 qca->memdump_state = QCA_MEMDUMP_COLLECTING;
1005                 cmd_hdr = (void *) skb->data;
1006                 seq_no = __le16_to_cpu(cmd_hdr->seq_no);
1007                 skb_pull(skb, sizeof(struct qca_memdump_event_hdr));
1008
1009                 if (!seq_no) {
1010
1011                         /* This is the first frame of memdump packet from
1012                          * the controller, Disable IBS to recevie dump
1013                          * with out any interruption, ideally time required for
1014                          * the controller to send the dump is 8 seconds. let us
1015                          * start timer to handle this asynchronous activity.
1016                          */
1017                         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1018                         set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1019                         dump = (void *) skb->data;
1020                         dump_size = __le32_to_cpu(dump->dump_size);
1021                         if (!(dump_size)) {
1022                                 bt_dev_err(hu->hdev, "Rx invalid memdump size");
1023                                 kfree_skb(skb);
1024                                 mutex_unlock(&qca->hci_memdump_lock);
1025                                 return;
1026                         }
1027
1028                         bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
1029                                     dump_size);
1030                         queue_delayed_work(qca->workqueue,
1031                                            &qca->ctrl_memdump_timeout,
1032                                            msecs_to_jiffies(MEMDUMP_TIMEOUT_MS)
1033                                           );
1034
1035                         skb_pull(skb, sizeof(dump_size));
1036                         memdump_buf = vmalloc(dump_size);
1037                         qca_memdump->ram_dump_size = dump_size;
1038                         qca_memdump->memdump_buf_head = memdump_buf;
1039                         qca_memdump->memdump_buf_tail = memdump_buf;
1040                 }
1041
1042                 memdump_buf = qca_memdump->memdump_buf_tail;
1043
1044                 /* If sequence no 0 is missed then there is no point in
1045                  * accepting the other sequences.
1046                  */
1047                 if (!memdump_buf) {
1048                         bt_dev_err(hu->hdev, "QCA: Discarding other packets");
1049                         kfree(qca_memdump);
1050                         kfree_skb(skb);
1051                         qca->qca_memdump = NULL;
1052                         mutex_unlock(&qca->hci_memdump_lock);
1053                         return;
1054                 }
1055
1056                 /* There could be chance of missing some packets from
1057                  * the controller. In such cases let us store the dummy
1058                  * packets in the buffer.
1059                  */
1060                 /* For QCA6390, controller does not lost packets but
1061                  * sequence number field of packat sometimes has error
1062                  * bits, so skip this checking for missing packet.
1063                  */
1064                 while ((seq_no > qca_memdump->current_seq_no + 1) &&
1065                        (soc_type != QCA_QCA6390) &&
1066                        seq_no != QCA_LAST_SEQUENCE_NUM) {
1067                         bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
1068                                    qca_memdump->current_seq_no);
1069                         rx_size = qca_memdump->received_dump;
1070                         rx_size += QCA_DUMP_PACKET_SIZE;
1071                         if (rx_size > qca_memdump->ram_dump_size) {
1072                                 bt_dev_err(hu->hdev,
1073                                            "QCA memdump received %d, no space for missed packet",
1074                                            qca_memdump->received_dump);
1075                                 break;
1076                         }
1077                         memcpy(memdump_buf, nullBuff, QCA_DUMP_PACKET_SIZE);
1078                         memdump_buf = memdump_buf + QCA_DUMP_PACKET_SIZE;
1079                         qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
1080                         qca_memdump->current_seq_no++;
1081                 }
1082
1083                 rx_size = qca_memdump->received_dump + skb->len;
1084                 if (rx_size <= qca_memdump->ram_dump_size) {
1085                         if ((seq_no != QCA_LAST_SEQUENCE_NUM) &&
1086                             (seq_no != qca_memdump->current_seq_no))
1087                                 bt_dev_err(hu->hdev,
1088                                            "QCA memdump unexpected packet %d",
1089                                            seq_no);
1090                         bt_dev_dbg(hu->hdev,
1091                                    "QCA memdump packet %d with length %d",
1092                                    seq_no, skb->len);
1093                         memcpy(memdump_buf, (unsigned char *)skb->data,
1094                                skb->len);
1095                         memdump_buf = memdump_buf + skb->len;
1096                         qca_memdump->memdump_buf_tail = memdump_buf;
1097                         qca_memdump->current_seq_no = seq_no + 1;
1098                         qca_memdump->received_dump += skb->len;
1099                 } else {
1100                         bt_dev_err(hu->hdev,
1101                                    "QCA memdump received %d, no space for packet %d",
1102                                    qca_memdump->received_dump, seq_no);
1103                 }
1104                 qca->qca_memdump = qca_memdump;
1105                 kfree_skb(skb);
1106                 if (seq_no == QCA_LAST_SEQUENCE_NUM) {
1107                         bt_dev_info(hu->hdev,
1108                                     "QCA memdump Done, received %d, total %d",
1109                                     qca_memdump->received_dump,
1110                                     qca_memdump->ram_dump_size);
1111                         memdump_buf = qca_memdump->memdump_buf_head;
1112                         dev_coredumpv(&hu->serdev->dev, memdump_buf,
1113                                       qca_memdump->received_dump, GFP_KERNEL);
1114                         cancel_delayed_work(&qca->ctrl_memdump_timeout);
1115                         kfree(qca->qca_memdump);
1116                         qca->qca_memdump = NULL;
1117                         qca->memdump_state = QCA_MEMDUMP_COLLECTED;
1118                         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1119                 }
1120
1121                 mutex_unlock(&qca->hci_memdump_lock);
1122         }
1123
1124 }
1125
1126 static int qca_controller_memdump_event(struct hci_dev *hdev,
1127                                         struct sk_buff *skb)
1128 {
1129         struct hci_uart *hu = hci_get_drvdata(hdev);
1130         struct qca_data *qca = hu->priv;
1131
1132         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1133         skb_queue_tail(&qca->rx_memdump_q, skb);
1134         queue_work(qca->workqueue, &qca->ctrl_memdump_evt);
1135
1136         return 0;
1137 }
1138
1139 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
1140 {
1141         struct hci_uart *hu = hci_get_drvdata(hdev);
1142         struct qca_data *qca = hu->priv;
1143
1144         if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
1145                 struct hci_event_hdr *hdr = (void *)skb->data;
1146
1147                 /* For the WCN3990 the vendor command for a baudrate change
1148                  * isn't sent as synchronous HCI command, because the
1149                  * controller sends the corresponding vendor event with the
1150                  * new baudrate. The event is received and properly decoded
1151                  * after changing the baudrate of the host port. It needs to
1152                  * be dropped, otherwise it can be misinterpreted as
1153                  * response to a later firmware download command (also a
1154                  * vendor command).
1155                  */
1156
1157                 if (hdr->evt == HCI_EV_VENDOR)
1158                         complete(&qca->drop_ev_comp);
1159
1160                 kfree_skb(skb);
1161
1162                 return 0;
1163         }
1164         /* We receive chip memory dump as an event packet, With a dedicated
1165          * handler followed by a hardware error event. When this event is
1166          * received we store dump into a file before closing hci. This
1167          * dump will help in triaging the issues.
1168          */
1169         if ((skb->data[0] == HCI_VENDOR_PKT) &&
1170             (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
1171                 return qca_controller_memdump_event(hdev, skb);
1172
1173         return hci_recv_frame(hdev, skb);
1174 }
1175
1176 #define QCA_IBS_SLEEP_IND_EVENT \
1177         .type = HCI_IBS_SLEEP_IND, \
1178         .hlen = 0, \
1179         .loff = 0, \
1180         .lsize = 0, \
1181         .maxlen = HCI_MAX_IBS_SIZE
1182
1183 #define QCA_IBS_WAKE_IND_EVENT \
1184         .type = HCI_IBS_WAKE_IND, \
1185         .hlen = 0, \
1186         .loff = 0, \
1187         .lsize = 0, \
1188         .maxlen = HCI_MAX_IBS_SIZE
1189
1190 #define QCA_IBS_WAKE_ACK_EVENT \
1191         .type = HCI_IBS_WAKE_ACK, \
1192         .hlen = 0, \
1193         .loff = 0, \
1194         .lsize = 0, \
1195         .maxlen = HCI_MAX_IBS_SIZE
1196
1197 static const struct h4_recv_pkt qca_recv_pkts[] = {
1198         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
1199         { H4_RECV_SCO,             .recv = hci_recv_frame    },
1200         { H4_RECV_EVENT,           .recv = qca_recv_event    },
1201         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
1202         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
1203         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
1204 };
1205
1206 static int qca_recv(struct hci_uart *hu, const void *data, int count)
1207 {
1208         struct qca_data *qca = hu->priv;
1209
1210         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
1211                 return -EUNATCH;
1212
1213         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
1214                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
1215         if (IS_ERR(qca->rx_skb)) {
1216                 int err = PTR_ERR(qca->rx_skb);
1217                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
1218                 qca->rx_skb = NULL;
1219                 return err;
1220         }
1221
1222         return count;
1223 }
1224
1225 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
1226 {
1227         struct qca_data *qca = hu->priv;
1228
1229         return skb_dequeue(&qca->txq);
1230 }
1231
1232 static uint8_t qca_get_baudrate_value(int speed)
1233 {
1234         switch (speed) {
1235         case 9600:
1236                 return QCA_BAUDRATE_9600;
1237         case 19200:
1238                 return QCA_BAUDRATE_19200;
1239         case 38400:
1240                 return QCA_BAUDRATE_38400;
1241         case 57600:
1242                 return QCA_BAUDRATE_57600;
1243         case 115200:
1244                 return QCA_BAUDRATE_115200;
1245         case 230400:
1246                 return QCA_BAUDRATE_230400;
1247         case 460800:
1248                 return QCA_BAUDRATE_460800;
1249         case 500000:
1250                 return QCA_BAUDRATE_500000;
1251         case 921600:
1252                 return QCA_BAUDRATE_921600;
1253         case 1000000:
1254                 return QCA_BAUDRATE_1000000;
1255         case 2000000:
1256                 return QCA_BAUDRATE_2000000;
1257         case 3000000:
1258                 return QCA_BAUDRATE_3000000;
1259         case 3200000:
1260                 return QCA_BAUDRATE_3200000;
1261         case 3500000:
1262                 return QCA_BAUDRATE_3500000;
1263         default:
1264                 return QCA_BAUDRATE_115200;
1265         }
1266 }
1267
1268 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
1269 {
1270         struct hci_uart *hu = hci_get_drvdata(hdev);
1271         struct qca_data *qca = hu->priv;
1272         struct sk_buff *skb;
1273         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
1274
1275         if (baudrate > QCA_BAUDRATE_3200000)
1276                 return -EINVAL;
1277
1278         cmd[4] = baudrate;
1279
1280         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1281         if (!skb) {
1282                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
1283                 return -ENOMEM;
1284         }
1285
1286         /* Assign commands to change baudrate and packet type. */
1287         skb_put_data(skb, cmd, sizeof(cmd));
1288         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1289
1290         skb_queue_tail(&qca->txq, skb);
1291         hci_uart_tx_wakeup(hu);
1292
1293         /* Wait for the baudrate change request to be sent */
1294
1295         while (!skb_queue_empty(&qca->txq))
1296                 usleep_range(100, 200);
1297
1298         if (hu->serdev)
1299                 serdev_device_wait_until_sent(hu->serdev,
1300                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1301
1302         /* Give the controller time to process the request */
1303         if (qca_is_wcn399x(qca_soc_type(hu)))
1304                 msleep(10);
1305         else
1306                 msleep(300);
1307
1308         return 0;
1309 }
1310
1311 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1312 {
1313         if (hu->serdev)
1314                 serdev_device_set_baudrate(hu->serdev, speed);
1315         else
1316                 hci_uart_set_baudrate(hu, speed);
1317 }
1318
1319 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1320 {
1321         int ret;
1322         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1323         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1324
1325         /* These power pulses are single byte command which are sent
1326          * at required baudrate to wcn3990. On wcn3990, we have an external
1327          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1328          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1329          * and also we use the same power inputs to turn on and off for
1330          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1331          * we send a power on pulse at 115200 bps. This algorithm will help to
1332          * save power. Disabling hardware flow control is mandatory while
1333          * sending power pulses to SoC.
1334          */
1335         bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1336
1337         serdev_device_write_flush(hu->serdev);
1338         hci_uart_set_flow_control(hu, true);
1339         ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1340         if (ret < 0) {
1341                 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1342                 return ret;
1343         }
1344
1345         serdev_device_wait_until_sent(hu->serdev, timeout);
1346         hci_uart_set_flow_control(hu, false);
1347
1348         /* Give to controller time to boot/shutdown */
1349         if (on)
1350                 msleep(100);
1351         else
1352                 msleep(10);
1353
1354         return 0;
1355 }
1356
1357 static unsigned int qca_get_speed(struct hci_uart *hu,
1358                                   enum qca_speed_type speed_type)
1359 {
1360         unsigned int speed = 0;
1361
1362         if (speed_type == QCA_INIT_SPEED) {
1363                 if (hu->init_speed)
1364                         speed = hu->init_speed;
1365                 else if (hu->proto->init_speed)
1366                         speed = hu->proto->init_speed;
1367         } else {
1368                 if (hu->oper_speed)
1369                         speed = hu->oper_speed;
1370                 else if (hu->proto->oper_speed)
1371                         speed = hu->proto->oper_speed;
1372         }
1373
1374         return speed;
1375 }
1376
1377 static int qca_check_speeds(struct hci_uart *hu)
1378 {
1379         if (qca_is_wcn399x(qca_soc_type(hu))) {
1380                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1381                     !qca_get_speed(hu, QCA_OPER_SPEED))
1382                         return -EINVAL;
1383         } else {
1384                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1385                     !qca_get_speed(hu, QCA_OPER_SPEED))
1386                         return -EINVAL;
1387         }
1388
1389         return 0;
1390 }
1391
1392 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1393 {
1394         unsigned int speed, qca_baudrate;
1395         struct qca_data *qca = hu->priv;
1396         int ret = 0;
1397
1398         if (speed_type == QCA_INIT_SPEED) {
1399                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1400                 if (speed)
1401                         host_set_baudrate(hu, speed);
1402         } else {
1403                 enum qca_btsoc_type soc_type = qca_soc_type(hu);
1404
1405                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1406                 if (!speed)
1407                         return 0;
1408
1409                 /* Disable flow control for wcn3990 to deassert RTS while
1410                  * changing the baudrate of chip and host.
1411                  */
1412                 if (qca_is_wcn399x(soc_type))
1413                         hci_uart_set_flow_control(hu, true);
1414
1415                 if (soc_type == QCA_WCN3990) {
1416                         reinit_completion(&qca->drop_ev_comp);
1417                         set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1418                 }
1419
1420                 qca_baudrate = qca_get_baudrate_value(speed);
1421                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1422                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1423                 if (ret)
1424                         goto error;
1425
1426                 host_set_baudrate(hu, speed);
1427
1428 error:
1429                 if (qca_is_wcn399x(soc_type))
1430                         hci_uart_set_flow_control(hu, false);
1431
1432                 if (soc_type == QCA_WCN3990) {
1433                         /* Wait for the controller to send the vendor event
1434                          * for the baudrate change command.
1435                          */
1436                         if (!wait_for_completion_timeout(&qca->drop_ev_comp,
1437                                                  msecs_to_jiffies(100))) {
1438                                 bt_dev_err(hu->hdev,
1439                                            "Failed to change controller baudrate\n");
1440                                 ret = -ETIMEDOUT;
1441                         }
1442
1443                         clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1444                 }
1445         }
1446
1447         return ret;
1448 }
1449
1450 static int qca_send_crashbuffer(struct hci_uart *hu)
1451 {
1452         struct qca_data *qca = hu->priv;
1453         struct sk_buff *skb;
1454
1455         skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
1456         if (!skb) {
1457                 bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
1458                 return -ENOMEM;
1459         }
1460
1461         /* We forcefully crash the controller, by sending 0xfb byte for
1462          * 1024 times. We also might have chance of losing data, To be
1463          * on safer side we send 1096 bytes to the SoC.
1464          */
1465         memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
1466                QCA_CRASHBYTE_PACKET_LEN);
1467         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1468         bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
1469         skb_queue_tail(&qca->txq, skb);
1470         hci_uart_tx_wakeup(hu);
1471
1472         return 0;
1473 }
1474
1475 static void qca_wait_for_dump_collection(struct hci_dev *hdev)
1476 {
1477         struct hci_uart *hu = hci_get_drvdata(hdev);
1478         struct qca_data *qca = hu->priv;
1479
1480         wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
1481                             TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);
1482
1483         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1484 }
1485
1486 static void qca_hw_error(struct hci_dev *hdev, u8 code)
1487 {
1488         struct hci_uart *hu = hci_get_drvdata(hdev);
1489         struct qca_data *qca = hu->priv;
1490
1491         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1492         set_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1493         bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);
1494
1495         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1496                 /* If hardware error event received for other than QCA
1497                  * soc memory dump event, then we need to crash the SOC
1498                  * and wait here for 8 seconds to get the dump packets.
1499                  * This will block main thread to be on hold until we
1500                  * collect dump.
1501                  */
1502                 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1503                 qca_send_crashbuffer(hu);
1504                 qca_wait_for_dump_collection(hdev);
1505         } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1506                 /* Let us wait here until memory dump collected or
1507                  * memory dump timer expired.
1508                  */
1509                 bt_dev_info(hdev, "waiting for dump to complete");
1510                 qca_wait_for_dump_collection(hdev);
1511         }
1512
1513         mutex_lock(&qca->hci_memdump_lock);
1514         if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1515                 bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
1516                 if (qca->qca_memdump) {
1517                         vfree(qca->qca_memdump->memdump_buf_head);
1518                         kfree(qca->qca_memdump);
1519                         qca->qca_memdump = NULL;
1520                 }
1521                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1522                 cancel_delayed_work(&qca->ctrl_memdump_timeout);
1523         }
1524         mutex_unlock(&qca->hci_memdump_lock);
1525
1526         if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
1527             qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
1528                 cancel_work_sync(&qca->ctrl_memdump_evt);
1529                 skb_queue_purge(&qca->rx_memdump_q);
1530         }
1531
1532         clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1533 }
1534
1535 static void qca_cmd_timeout(struct hci_dev *hdev)
1536 {
1537         struct hci_uart *hu = hci_get_drvdata(hdev);
1538         struct qca_data *qca = hu->priv;
1539
1540         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1541         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1542                 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1543                 qca_send_crashbuffer(hu);
1544                 qca_wait_for_dump_collection(hdev);
1545         } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1546                 /* Let us wait here until memory dump collected or
1547                  * memory dump timer expired.
1548                  */
1549                 bt_dev_info(hdev, "waiting for dump to complete");
1550                 qca_wait_for_dump_collection(hdev);
1551         }
1552
1553         mutex_lock(&qca->hci_memdump_lock);
1554         if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1555                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1556                 if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
1557                         /* Inject hw error event to reset the device
1558                          * and driver.
1559                          */
1560                         hci_reset_dev(hu->hdev);
1561                 }
1562         }
1563         mutex_unlock(&qca->hci_memdump_lock);
1564 }
1565
1566 static int qca_wcn3990_init(struct hci_uart *hu)
1567 {
1568         struct qca_serdev *qcadev;
1569         int ret;
1570
1571         /* Check for vregs status, may be hci down has turned
1572          * off the voltage regulator.
1573          */
1574         qcadev = serdev_device_get_drvdata(hu->serdev);
1575         if (!qcadev->bt_power->vregs_on) {
1576                 serdev_device_close(hu->serdev);
1577                 ret = qca_regulator_enable(qcadev);
1578                 if (ret)
1579                         return ret;
1580
1581                 ret = serdev_device_open(hu->serdev);
1582                 if (ret) {
1583                         bt_dev_err(hu->hdev, "failed to open port");
1584                         return ret;
1585                 }
1586         }
1587
1588         /* Forcefully enable wcn3990 to enter in to boot mode. */
1589         host_set_baudrate(hu, 2400);
1590         ret = qca_send_power_pulse(hu, false);
1591         if (ret)
1592                 return ret;
1593
1594         qca_set_speed(hu, QCA_INIT_SPEED);
1595         ret = qca_send_power_pulse(hu, true);
1596         if (ret)
1597                 return ret;
1598
1599         /* Now the device is in ready state to communicate with host.
1600          * To sync host with device we need to reopen port.
1601          * Without this, we will have RTS and CTS synchronization
1602          * issues.
1603          */
1604         serdev_device_close(hu->serdev);
1605         ret = serdev_device_open(hu->serdev);
1606         if (ret) {
1607                 bt_dev_err(hu->hdev, "failed to open port");
1608                 return ret;
1609         }
1610
1611         hci_uart_set_flow_control(hu, false);
1612
1613         return 0;
1614 }
1615
1616 static int qca_power_on(struct hci_dev *hdev)
1617 {
1618         struct hci_uart *hu = hci_get_drvdata(hdev);
1619         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1620         struct qca_serdev *qcadev;
1621         int ret = 0;
1622
1623         /* Non-serdev device usually is powered by external power
1624          * and don't need additional action in driver for power on
1625          */
1626         if (!hu->serdev)
1627                 return 0;
1628
1629         if (qca_is_wcn399x(soc_type)) {
1630                 ret = qca_wcn3990_init(hu);
1631         } else {
1632                 qcadev = serdev_device_get_drvdata(hu->serdev);
1633                 if (qcadev->bt_en) {
1634                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
1635                         /* Controller needs time to bootup. */
1636                         msleep(150);
1637                 }
1638         }
1639
1640         return ret;
1641 }
1642
1643 static int qca_setup(struct hci_uart *hu)
1644 {
1645         struct hci_dev *hdev = hu->hdev;
1646         struct qca_data *qca = hu->priv;
1647         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1648         unsigned int retries = 0;
1649         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1650         const char *firmware_name = qca_get_firmware_name(hu);
1651         int ret;
1652         int soc_ver = 0;
1653
1654         ret = qca_check_speeds(hu);
1655         if (ret)
1656                 return ret;
1657
1658         /* Patch downloading has to be done without IBS mode */
1659         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1660
1661         /* Enable controller to do both LE scan and BR/EDR inquiry
1662          * simultaneously.
1663          */
1664         set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
1665
1666         bt_dev_info(hdev, "setting up %s",
1667                 qca_is_wcn399x(soc_type) ? "wcn399x" : "ROME/QCA6390");
1668
1669         qca->memdump_state = QCA_MEMDUMP_IDLE;
1670
1671 retry:
1672         ret = qca_power_on(hdev);
1673         if (ret)
1674                 return ret;
1675
1676         clear_bit(QCA_SSR_TRIGGERED, &qca->flags);
1677
1678         if (qca_is_wcn399x(soc_type)) {
1679                 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1680
1681                 ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
1682                 if (ret)
1683                         return ret;
1684         } else {
1685                 qca_set_speed(hu, QCA_INIT_SPEED);
1686         }
1687
1688         /* Setup user speed if needed */
1689         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1690         if (speed) {
1691                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1692                 if (ret)
1693                         return ret;
1694
1695                 qca_baudrate = qca_get_baudrate_value(speed);
1696         }
1697
1698         if (!qca_is_wcn399x(soc_type)) {
1699                 /* Get QCA version information */
1700                 ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
1701                 if (ret)
1702                         return ret;
1703         }
1704
1705         bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
1706         /* Setup patch / NVM configurations */
1707         ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver,
1708                         firmware_name);
1709         if (!ret) {
1710                 set_bit(QCA_IBS_ENABLED, &qca->flags);
1711                 qca_debugfs_init(hdev);
1712                 hu->hdev->hw_error = qca_hw_error;
1713                 hu->hdev->cmd_timeout = qca_cmd_timeout;
1714         } else if (ret == -ENOENT) {
1715                 /* No patch/nvm-config found, run with original fw/config */
1716                 ret = 0;
1717         } else if (ret == -EAGAIN) {
1718                 /*
1719                  * Userspace firmware loader will return -EAGAIN in case no
1720                  * patch/nvm-config is found, so run with original fw/config.
1721                  */
1722                 ret = 0;
1723         } else {
1724                 if (retries < MAX_INIT_RETRIES) {
1725                         qca_power_shutdown(hu);
1726                         if (hu->serdev) {
1727                                 serdev_device_close(hu->serdev);
1728                                 ret = serdev_device_open(hu->serdev);
1729                                 if (ret) {
1730                                         bt_dev_err(hdev, "failed to open port");
1731                                         return ret;
1732                                 }
1733                         }
1734                         retries++;
1735                         goto retry;
1736                 }
1737         }
1738
1739         /* Setup bdaddr */
1740         if (soc_type == QCA_ROME)
1741                 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1742         else
1743                 hu->hdev->set_bdaddr = qca_set_bdaddr;
1744
1745         return ret;
1746 }
1747
1748 static const struct hci_uart_proto qca_proto = {
1749         .id             = HCI_UART_QCA,
1750         .name           = "QCA",
1751         .manufacturer   = 29,
1752         .init_speed     = 115200,
1753         .oper_speed     = 3000000,
1754         .open           = qca_open,
1755         .close          = qca_close,
1756         .flush          = qca_flush,
1757         .setup          = qca_setup,
1758         .recv           = qca_recv,
1759         .enqueue        = qca_enqueue,
1760         .dequeue        = qca_dequeue,
1761 };
1762
1763 static const struct qca_device_data qca_soc_data_wcn3990 = {
1764         .soc_type = QCA_WCN3990,
1765         .vregs = (struct qca_vreg []) {
1766                 { "vddio", 15000  },
1767                 { "vddxo", 80000  },
1768                 { "vddrf", 300000 },
1769                 { "vddch0", 450000 },
1770         },
1771         .num_vregs = 4,
1772 };
1773
1774 static const struct qca_device_data qca_soc_data_wcn3991 = {
1775         .soc_type = QCA_WCN3991,
1776         .vregs = (struct qca_vreg []) {
1777                 { "vddio", 15000  },
1778                 { "vddxo", 80000  },
1779                 { "vddrf", 300000 },
1780                 { "vddch0", 450000 },
1781         },
1782         .num_vregs = 4,
1783         .capabilities = QCA_CAP_WIDEBAND_SPEECH,
1784 };
1785
1786 static const struct qca_device_data qca_soc_data_wcn3998 = {
1787         .soc_type = QCA_WCN3998,
1788         .vregs = (struct qca_vreg []) {
1789                 { "vddio", 10000  },
1790                 { "vddxo", 80000  },
1791                 { "vddrf", 300000 },
1792                 { "vddch0", 450000 },
1793         },
1794         .num_vregs = 4,
1795 };
1796
1797 static const struct qca_device_data qca_soc_data_qca6390 = {
1798         .soc_type = QCA_QCA6390,
1799         .num_vregs = 0,
1800 };
1801
1802 static void qca_power_shutdown(struct hci_uart *hu)
1803 {
1804         struct qca_serdev *qcadev;
1805         struct qca_data *qca = hu->priv;
1806         unsigned long flags;
1807         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1808
1809         qcadev = serdev_device_get_drvdata(hu->serdev);
1810
1811         /* From this point we go into power off state. But serial port is
1812          * still open, stop queueing the IBS data and flush all the buffered
1813          * data in skb's.
1814          */
1815         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1816         clear_bit(QCA_IBS_ENABLED, &qca->flags);
1817         qca_flush(hu);
1818         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1819
1820         /* Non-serdev device usually is powered by external power
1821          * and don't need additional action in driver for power down
1822          */
1823         if (!hu->serdev)
1824                 return;
1825
1826         if (qca_is_wcn399x(soc_type)) {
1827                 host_set_baudrate(hu, 2400);
1828                 qca_send_power_pulse(hu, false);
1829                 qca_regulator_disable(qcadev);
1830         } else if (qcadev->bt_en) {
1831                 gpiod_set_value_cansleep(qcadev->bt_en, 0);
1832         }
1833 }
1834
1835 static int qca_power_off(struct hci_dev *hdev)
1836 {
1837         struct hci_uart *hu = hci_get_drvdata(hdev);
1838         struct qca_data *qca = hu->priv;
1839         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1840
1841         hu->hdev->hw_error = NULL;
1842         hu->hdev->cmd_timeout = NULL;
1843
1844         /* Stop sending shutdown command if soc crashes. */
1845         if (soc_type != QCA_ROME
1846                 && qca->memdump_state == QCA_MEMDUMP_IDLE) {
1847                 qca_send_pre_shutdown_cmd(hdev);
1848                 usleep_range(8000, 10000);
1849         }
1850
1851         qca_power_shutdown(hu);
1852         return 0;
1853 }
1854
1855 static int qca_regulator_enable(struct qca_serdev *qcadev)
1856 {
1857         struct qca_power *power = qcadev->bt_power;
1858         int ret;
1859
1860         /* Already enabled */
1861         if (power->vregs_on)
1862                 return 0;
1863
1864         BT_DBG("enabling %d regulators)", power->num_vregs);
1865
1866         ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
1867         if (ret)
1868                 return ret;
1869
1870         power->vregs_on = true;
1871
1872         ret = clk_prepare_enable(qcadev->susclk);
1873         if (ret)
1874                 qca_regulator_disable(qcadev);
1875
1876         return ret;
1877 }
1878
1879 static void qca_regulator_disable(struct qca_serdev *qcadev)
1880 {
1881         struct qca_power *power;
1882
1883         if (!qcadev)
1884                 return;
1885
1886         power = qcadev->bt_power;
1887
1888         /* Already disabled? */
1889         if (!power->vregs_on)
1890                 return;
1891
1892         regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
1893         power->vregs_on = false;
1894
1895         clk_disable_unprepare(qcadev->susclk);
1896 }
1897
1898 static int qca_init_regulators(struct qca_power *qca,
1899                                 const struct qca_vreg *vregs, size_t num_vregs)
1900 {
1901         struct regulator_bulk_data *bulk;
1902         int ret;
1903         int i;
1904
1905         bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
1906         if (!bulk)
1907                 return -ENOMEM;
1908
1909         for (i = 0; i < num_vregs; i++)
1910                 bulk[i].supply = vregs[i].name;
1911
1912         ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
1913         if (ret < 0)
1914                 return ret;
1915
1916         for (i = 0; i < num_vregs; i++) {
1917                 ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
1918                 if (ret)
1919                         return ret;
1920         }
1921
1922         qca->vreg_bulk = bulk;
1923         qca->num_vregs = num_vregs;
1924
1925         return 0;
1926 }
1927
1928 static int qca_serdev_probe(struct serdev_device *serdev)
1929 {
1930         struct qca_serdev *qcadev;
1931         struct hci_dev *hdev;
1932         const struct qca_device_data *data;
1933         int err;
1934         bool power_ctrl_enabled = true;
1935
1936         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
1937         if (!qcadev)
1938                 return -ENOMEM;
1939
1940         qcadev->serdev_hu.serdev = serdev;
1941         data = device_get_match_data(&serdev->dev);
1942         serdev_device_set_drvdata(serdev, qcadev);
1943         device_property_read_string(&serdev->dev, "firmware-name",
1944                                          &qcadev->firmware_name);
1945         device_property_read_u32(&serdev->dev, "max-speed",
1946                                  &qcadev->oper_speed);
1947         if (!qcadev->oper_speed)
1948                 BT_DBG("UART will pick default operating speed");
1949
1950         if (data && qca_is_wcn399x(data->soc_type)) {
1951                 qcadev->btsoc_type = data->soc_type;
1952                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
1953                                                 sizeof(struct qca_power),
1954                                                 GFP_KERNEL);
1955                 if (!qcadev->bt_power)
1956                         return -ENOMEM;
1957
1958                 qcadev->bt_power->dev = &serdev->dev;
1959                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
1960                                           data->num_vregs);
1961                 if (err) {
1962                         BT_ERR("Failed to init regulators:%d", err);
1963                         return err;
1964                 }
1965
1966                 qcadev->bt_power->vregs_on = false;
1967
1968                 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
1969                 if (IS_ERR(qcadev->susclk)) {
1970                         dev_err(&serdev->dev, "failed to acquire clk\n");
1971                         return PTR_ERR(qcadev->susclk);
1972                 }
1973
1974                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
1975                 if (err) {
1976                         BT_ERR("wcn3990 serdev registration failed");
1977                         return err;
1978                 }
1979         } else {
1980                 if (data)
1981                         qcadev->btsoc_type = data->soc_type;
1982                 else
1983                         qcadev->btsoc_type = QCA_ROME;
1984
1985                 qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
1986                                                GPIOD_OUT_LOW);
1987                 if (!qcadev->bt_en) {
1988                         dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
1989                         power_ctrl_enabled = false;
1990                 }
1991
1992                 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
1993                 if (IS_ERR(qcadev->susclk)) {
1994                         dev_warn(&serdev->dev, "failed to acquire clk\n");
1995                         return PTR_ERR(qcadev->susclk);
1996                 }
1997                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
1998                 if (err)
1999                         return err;
2000
2001                 err = clk_prepare_enable(qcadev->susclk);
2002                 if (err)
2003                         return err;
2004
2005                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
2006                 if (err) {
2007                         BT_ERR("Rome serdev registration failed");
2008                         clk_disable_unprepare(qcadev->susclk);
2009                         return err;
2010                 }
2011         }
2012
2013         hdev = qcadev->serdev_hu.hdev;
2014
2015         if (power_ctrl_enabled) {
2016                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
2017                 hdev->shutdown = qca_power_off;
2018         }
2019
2020         /* Wideband speech support must be set per driver since it can't be
2021          * queried via hci.
2022          */
2023         if (data && (data->capabilities & QCA_CAP_WIDEBAND_SPEECH))
2024                 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
2025
2026         return 0;
2027 }
2028
2029 static void qca_serdev_remove(struct serdev_device *serdev)
2030 {
2031         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2032         struct qca_power *power = qcadev->bt_power;
2033
2034         if (qca_is_wcn399x(qcadev->btsoc_type) && power->vregs_on)
2035                 qca_power_shutdown(&qcadev->serdev_hu);
2036         else if (qcadev->susclk)
2037                 clk_disable_unprepare(qcadev->susclk);
2038
2039         hci_uart_unregister_device(&qcadev->serdev_hu);
2040 }
2041
2042 static void qca_serdev_shutdown(struct device *dev)
2043 {
2044         int ret;
2045         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
2046         struct serdev_device *serdev = to_serdev_device(dev);
2047         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2048         const u8 ibs_wake_cmd[] = { 0xFD };
2049         const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 };
2050
2051         if (qcadev->btsoc_type == QCA_QCA6390) {
2052                 serdev_device_write_flush(serdev);
2053                 ret = serdev_device_write_buf(serdev, ibs_wake_cmd,
2054                                               sizeof(ibs_wake_cmd));
2055                 if (ret < 0) {
2056                         BT_ERR("QCA send IBS_WAKE_IND error: %d", ret);
2057                         return;
2058                 }
2059                 serdev_device_wait_until_sent(serdev, timeout);
2060                 usleep_range(8000, 10000);
2061
2062                 serdev_device_write_flush(serdev);
2063                 ret = serdev_device_write_buf(serdev, edl_reset_soc_cmd,
2064                                               sizeof(edl_reset_soc_cmd));
2065                 if (ret < 0) {
2066                         BT_ERR("QCA send EDL_RESET_REQ error: %d", ret);
2067                         return;
2068                 }
2069                 serdev_device_wait_until_sent(serdev, timeout);
2070                 usleep_range(8000, 10000);
2071         }
2072 }
2073
2074 static int __maybe_unused qca_suspend(struct device *dev)
2075 {
2076         struct serdev_device *serdev = to_serdev_device(dev);
2077         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2078         struct hci_uart *hu = &qcadev->serdev_hu;
2079         struct qca_data *qca = hu->priv;
2080         unsigned long flags;
2081         bool tx_pending = false;
2082         int ret = 0;
2083         u8 cmd;
2084
2085         set_bit(QCA_SUSPENDING, &qca->flags);
2086
2087         /* Device is downloading patch or doesn't support in-band sleep. */
2088         if (!test_bit(QCA_IBS_ENABLED, &qca->flags))
2089                 return 0;
2090
2091         cancel_work_sync(&qca->ws_awake_device);
2092         cancel_work_sync(&qca->ws_awake_rx);
2093
2094         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
2095                                  flags, SINGLE_DEPTH_NESTING);
2096
2097         switch (qca->tx_ibs_state) {
2098         case HCI_IBS_TX_WAKING:
2099                 del_timer(&qca->wake_retrans_timer);
2100                 fallthrough;
2101         case HCI_IBS_TX_AWAKE:
2102                 del_timer(&qca->tx_idle_timer);
2103
2104                 serdev_device_write_flush(hu->serdev);
2105                 cmd = HCI_IBS_SLEEP_IND;
2106                 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
2107
2108                 if (ret < 0) {
2109                         BT_ERR("Failed to send SLEEP to device");
2110                         break;
2111                 }
2112
2113                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
2114                 qca->ibs_sent_slps++;
2115                 tx_pending = true;
2116                 break;
2117
2118         case HCI_IBS_TX_ASLEEP:
2119                 break;
2120
2121         default:
2122                 BT_ERR("Spurious tx state %d", qca->tx_ibs_state);
2123                 ret = -EINVAL;
2124                 break;
2125         }
2126
2127         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
2128
2129         if (ret < 0)
2130                 goto error;
2131
2132         if (tx_pending) {
2133                 serdev_device_wait_until_sent(hu->serdev,
2134                                               msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
2135                 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
2136         }
2137
2138         /* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going
2139          * to sleep, so that the packet does not wake the system later.
2140          */
2141         ret = wait_event_interruptible_timeout(qca->suspend_wait_q,
2142                         qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
2143                         msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
2144         if (ret == 0) {
2145                 ret = -ETIMEDOUT;
2146                 goto error;
2147         }
2148
2149         return 0;
2150
2151 error:
2152         clear_bit(QCA_SUSPENDING, &qca->flags);
2153
2154         return ret;
2155 }
2156
2157 static int __maybe_unused qca_resume(struct device *dev)
2158 {
2159         struct serdev_device *serdev = to_serdev_device(dev);
2160         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2161         struct hci_uart *hu = &qcadev->serdev_hu;
2162         struct qca_data *qca = hu->priv;
2163
2164         clear_bit(QCA_SUSPENDING, &qca->flags);
2165
2166         return 0;
2167 }
2168
2169 static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume);
2170
2171 #ifdef CONFIG_OF
2172 static const struct of_device_id qca_bluetooth_of_match[] = {
2173         { .compatible = "qcom,qca6174-bt" },
2174         { .compatible = "qcom,qca6390-bt", .data = &qca_soc_data_qca6390},
2175         { .compatible = "qcom,qca9377-bt" },
2176         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
2177         { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
2178         { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
2179         { /* sentinel */ }
2180 };
2181 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
2182 #endif
2183
2184 #ifdef CONFIG_ACPI
2185 static const struct acpi_device_id qca_bluetooth_acpi_match[] = {
2186         { "QCOM6390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2187         { "DLA16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2188         { "DLB16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2189         { "DLB26390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2190         { },
2191 };
2192 MODULE_DEVICE_TABLE(acpi, qca_bluetooth_acpi_match);
2193 #endif
2194
2195
2196 static struct serdev_device_driver qca_serdev_driver = {
2197         .probe = qca_serdev_probe,
2198         .remove = qca_serdev_remove,
2199         .driver = {
2200                 .name = "hci_uart_qca",
2201                 .of_match_table = of_match_ptr(qca_bluetooth_of_match),
2202                 .acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
2203                 .shutdown = qca_serdev_shutdown,
2204                 .pm = &qca_pm_ops,
2205         },
2206 };
2207
2208 int __init qca_init(void)
2209 {
2210         serdev_device_driver_register(&qca_serdev_driver);
2211
2212         return hci_uart_register_proto(&qca_proto);
2213 }
2214
2215 int __exit qca_deinit(void)
2216 {
2217         serdev_device_driver_unregister(&qca_serdev_driver);
2218
2219         return hci_uart_unregister_proto(&qca_proto);
2220 }