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 #define IBS_DISABLE_SSR_TIMEOUT_MS \
  54         (MEMDUMP_TIMEOUT_MS + FW_DOWNLOAD_TIMEOUT_MS)
  55 #define FW_DOWNLOAD_TIMEOUT_MS          3000
  56
  57 /* susclk rate */
  58 #define SUSCLK_RATE_32KHZ       32768
  59
  60 /* Controller debug log header */
  61 #define QCA_DEBUG_HANDLE        0x2EDC
  62
  63 /* max retry count when init fails */
  64 #define MAX_INIT_RETRIES 3
  65
  66 /* Controller dump header */
  67 #define QCA_SSR_DUMP_HANDLE             0x0108
  68 #define QCA_DUMP_PACKET_SIZE            255
  69 #define QCA_LAST_SEQUENCE_NUM           0xFFFF
  70 #define QCA_CRASHBYTE_PACKET_LEN        1096
  71 #define QCA_MEMDUMP_BYTE                0xFB
  72
  73 enum qca_flags {
  74         QCA_IBS_DISABLED,
  75         QCA_DROP_VENDOR_EVENT,
  76         QCA_SUSPENDING,
  77         QCA_MEMDUMP_COLLECTION,
  78         QCA_HW_ERROR_EVENT,
  79         QCA_SSR_TRIGGERED,
  80         QCA_BT_OFF,
  81         QCA_ROM_FW
  82 };
  83
  84 enum qca_capabilities {
  85         QCA_CAP_WIDEBAND_SPEECH = BIT(0),
  86         QCA_CAP_VALID_LE_STATES = BIT(1),
  87 };
  88
  89 /* HCI_IBS transmit side sleep protocol states */
  90 enum tx_ibs_states {
  91         HCI_IBS_TX_ASLEEP,
  92         HCI_IBS_TX_WAKING,
  93         HCI_IBS_TX_AWAKE,
  94 };
  95
  96 /* HCI_IBS receive side sleep protocol states */
  97 enum rx_states {
  98         HCI_IBS_RX_ASLEEP,
  99         HCI_IBS_RX_AWAKE,
 100 };
 101
 102 /* HCI_IBS transmit and receive side clock state vote */
 103 enum hci_ibs_clock_state_vote {
 104         HCI_IBS_VOTE_STATS_UPDATE,
 105         HCI_IBS_TX_VOTE_CLOCK_ON,
 106         HCI_IBS_TX_VOTE_CLOCK_OFF,
 107         HCI_IBS_RX_VOTE_CLOCK_ON,
 108         HCI_IBS_RX_VOTE_CLOCK_OFF,
 109 };
 110
 111 /* Controller memory dump states */
 112 enum qca_memdump_states {
 113         QCA_MEMDUMP_IDLE,
 114         QCA_MEMDUMP_COLLECTING,
 115         QCA_MEMDUMP_COLLECTED,
 116         QCA_MEMDUMP_TIMEOUT,
 117 };
 118
 119 struct qca_memdump_data {
 120         char *memdump_buf_head;
 121         char *memdump_buf_tail;
 122         u32 current_seq_no;
 123         u32 received_dump;
 124         u32 ram_dump_size;
 125 };
 126
 127 struct qca_memdump_event_hdr {
 128         __u8    evt;
 129         __u8    plen;
 130         __u16   opcode;
 131         __u16   seq_no;
 132         __u8    reserved;
 133 } __packed;
 134
 135
 136 struct qca_dump_size {
 137         u32 dump_size;
 138 } __packed;
 139
 140 struct qca_data {
 141         struct hci_uart *hu;
 142         struct sk_buff *rx_skb;
 143         struct sk_buff_head txq;
 144         struct sk_buff_head tx_wait_q;  /* HCI_IBS wait queue   */
 145         struct sk_buff_head rx_memdump_q;       /* Memdump wait queue   */
 146         spinlock_t hci_ibs_lock;        /* HCI_IBS state lock   */
 147         u8 tx_ibs_state;        /* HCI_IBS transmit side power state*/
 148         u8 rx_ibs_state;        /* HCI_IBS receive side power state */
 149         bool tx_vote;           /* Clock must be on for TX */
 150         bool rx_vote;           /* Clock must be on for RX */
 151         struct timer_list tx_idle_timer;
 152         u32 tx_idle_delay;
 153         struct timer_list wake_retrans_timer;
 154         u32 wake_retrans;
 155         struct workqueue_struct *workqueue;
 156         struct work_struct ws_awake_rx;
 157         struct work_struct ws_awake_device;
 158         struct work_struct ws_rx_vote_off;
 159         struct work_struct ws_tx_vote_off;
 160         struct work_struct ctrl_memdump_evt;
 161         struct delayed_work ctrl_memdump_timeout;
 162         struct qca_memdump_data *qca_memdump;
 163         unsigned long flags;
 164         struct completion drop_ev_comp;
 165         wait_queue_head_t suspend_wait_q;
 166         enum qca_memdump_states memdump_state;
 167         struct mutex hci_memdump_lock;
 168
 169         /* For debugging purpose */
 170         u64 ibs_sent_wacks;
 171         u64 ibs_sent_slps;
 172         u64 ibs_sent_wakes;
 173         u64 ibs_recv_wacks;
 174         u64 ibs_recv_slps;
 175         u64 ibs_recv_wakes;
 176         u64 vote_last_jif;
 177         u32 vote_on_ms;
 178         u32 vote_off_ms;
 179         u64 tx_votes_on;
 180         u64 rx_votes_on;
 181         u64 tx_votes_off;
 182         u64 rx_votes_off;
 183         u64 votes_on;
 184         u64 votes_off;
 185 };
 186
 187 enum qca_speed_type {
 188         QCA_INIT_SPEED = 1,
 189         QCA_OPER_SPEED
 190 };
 191
 192 /*
 193  * Voltage regulator information required for configuring the
 194  * QCA Bluetooth chipset
 195  */
 196 struct qca_vreg {
 197         const char *name;
 198         unsigned int load_uA;
 199 };
 200
 201 struct qca_device_data {
 202         enum qca_btsoc_type soc_type;
 203         struct qca_vreg *vregs;
 204         size_t num_vregs;
 205         uint32_t capabilities;
 206 };
 207
 208 /*
 209  * Platform data for the QCA Bluetooth power driver.
 210  */
 211 struct qca_power {
 212         struct device *dev;
 213         struct regulator_bulk_data *vreg_bulk;
 214         int num_vregs;
 215         bool vregs_on;
 216 };
 217
 218 struct qca_serdev {
 219         struct hci_uart  serdev_hu;
 220         struct gpio_desc *bt_en;
 221         struct gpio_desc *sw_ctrl;
 222         struct clk       *susclk;
 223         enum qca_btsoc_type btsoc_type;
 224         struct qca_power *bt_power;
 225         u32 init_speed;
 226         u32 oper_speed;
 227         const char *firmware_name;
 228 };
 229
 230 static int qca_regulator_enable(struct qca_serdev *qcadev);
 231 static void qca_regulator_disable(struct qca_serdev *qcadev);
 232 static void qca_power_shutdown(struct hci_uart *hu);
 233 static int qca_power_off(struct hci_dev *hdev);
 234 static void qca_controller_memdump(struct work_struct *work);
 235
 236 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
 237 {
 238         enum qca_btsoc_type soc_type;
 239
 240         if (hu->serdev) {
 241                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 242
 243                 soc_type = qsd->btsoc_type;
 244         } else {
 245                 soc_type = QCA_ROME;
 246         }
 247
 248         return soc_type;
 249 }
 250
 251 static const char *qca_get_firmware_name(struct hci_uart *hu)
 252 {
 253         if (hu->serdev) {
 254                 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);
 255
 256                 return qsd->firmware_name;
 257         } else {
 258                 return NULL;
 259         }
 260 }
 261
 262 static void __serial_clock_on(struct tty_struct *tty)
 263 {
 264         /* TODO: Some chipset requires to enable UART clock on client
 265          * side to save power consumption or manual work is required.
 266          * Please put your code to control UART clock here if needed
 267          */
 268 }
 269
 270 static void __serial_clock_off(struct tty_struct *tty)
 271 {
 272         /* TODO: Some chipset requires to disable UART clock on client
 273          * side to save power consumption or manual work is required.
 274          * Please put your code to control UART clock off here if needed
 275          */
 276 }
 277
 278 /* serial_clock_vote needs to be called with the ibs lock held */
 279 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu)
 280 {
 281         struct qca_data *qca = hu->priv;
 282         unsigned int diff;
 283
 284         bool old_vote = (qca->tx_vote | qca->rx_vote);
 285         bool new_vote;
 286
 287         switch (vote) {
 288         case HCI_IBS_VOTE_STATS_UPDATE:
 289                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 290
 291                 if (old_vote)
 292                         qca->vote_off_ms += diff;
 293                 else
 294                         qca->vote_on_ms += diff;
 295                 return;
 296
 297         case HCI_IBS_TX_VOTE_CLOCK_ON:
 298                 qca->tx_vote = true;
 299                 qca->tx_votes_on++;
 300                 break;
 301
 302         case HCI_IBS_RX_VOTE_CLOCK_ON:
 303                 qca->rx_vote = true;
 304                 qca->rx_votes_on++;
 305                 break;
 306
 307         case HCI_IBS_TX_VOTE_CLOCK_OFF:
 308                 qca->tx_vote = false;
 309                 qca->tx_votes_off++;
 310                 break;
 311
 312         case HCI_IBS_RX_VOTE_CLOCK_OFF:
 313                 qca->rx_vote = false;
 314                 qca->rx_votes_off++;
 315                 break;
 316
 317         default:
 318                 BT_ERR("Voting irregularity");
 319                 return;
 320         }
 321
 322         new_vote = qca->rx_vote | qca->tx_vote;
 323
 324         if (new_vote != old_vote) {
 325                 if (new_vote)
 326                         __serial_clock_on(hu->tty);
 327                 else
 328                         __serial_clock_off(hu->tty);
 329
 330                 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false",
 331                        vote ? "true" : "false");
 332
 333                 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif);
 334
 335                 if (new_vote) {
 336                         qca->votes_on++;
 337                         qca->vote_off_ms += diff;
 338                 } else {
 339                         qca->votes_off++;
 340                         qca->vote_on_ms += diff;
 341                 }
 342                 qca->vote_last_jif = jiffies;
 343         }
 344 }
 345
 346 /* Builds and sends an HCI_IBS command packet.
 347  * These are very simple packets with only 1 cmd byte.
 348  */
 349 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
 350 {
 351         int err = 0;
 352         struct sk_buff *skb = NULL;
 353         struct qca_data *qca = hu->priv;
 354
 355         BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd);
 356
 357         skb = bt_skb_alloc(1, GFP_ATOMIC);
 358         if (!skb) {
 359                 BT_ERR("Failed to allocate memory for HCI_IBS packet");
 360                 return -ENOMEM;
 361         }
 362
 363         /* Assign HCI_IBS type */
 364         skb_put_u8(skb, cmd);
 365
 366         skb_queue_tail(&qca->txq, skb);
 367
 368         return err;
 369 }
 370
 371 static void qca_wq_awake_device(struct work_struct *work)
 372 {
 373         struct qca_data *qca = container_of(work, struct qca_data,
 374                                             ws_awake_device);
 375         struct hci_uart *hu = qca->hu;
 376         unsigned long retrans_delay;
 377         unsigned long flags;
 378
 379         BT_DBG("hu %p wq awake device", hu);
 380
 381         /* Vote for serial clock */
 382         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
 383
 384         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 385
 386         /* Send wake indication to device */
 387         if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
 388                 BT_ERR("Failed to send WAKE to device");
 389
 390         qca->ibs_sent_wakes++;
 391
 392         /* Start retransmit timer */
 393         retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 394         mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 395
 396         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 397
 398         /* Actually send the packets */
 399         hci_uart_tx_wakeup(hu);
 400 }
 401
 402 static void qca_wq_awake_rx(struct work_struct *work)
 403 {
 404         struct qca_data *qca = container_of(work, struct qca_data,
 405                                             ws_awake_rx);
 406         struct hci_uart *hu = qca->hu;
 407         unsigned long flags;
 408
 409         BT_DBG("hu %p wq awake rx", hu);
 410
 411         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
 412
 413         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 414         qca->rx_ibs_state = HCI_IBS_RX_AWAKE;
 415
 416         /* Always acknowledge device wake up,
 417          * sending IBS message doesn't count as TX ON.
 418          */
 419         if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0)
 420                 BT_ERR("Failed to acknowledge device wake up");
 421
 422         qca->ibs_sent_wacks++;
 423
 424         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 425
 426         /* Actually send the packets */
 427         hci_uart_tx_wakeup(hu);
 428 }
 429
 430 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work)
 431 {
 432         struct qca_data *qca = container_of(work, struct qca_data,
 433                                             ws_rx_vote_off);
 434         struct hci_uart *hu = qca->hu;
 435
 436         BT_DBG("hu %p rx clock vote off", hu);
 437
 438         serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
 439 }
 440
 441 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work)
 442 {
 443         struct qca_data *qca = container_of(work, struct qca_data,
 444                                             ws_tx_vote_off);
 445         struct hci_uart *hu = qca->hu;
 446
 447         BT_DBG("hu %p tx clock vote off", hu);
 448
 449         /* Run HCI tx handling unlocked */
 450         hci_uart_tx_wakeup(hu);
 451
 452         /* Now that message queued to tty driver, vote for tty clocks off.
 453          * It is up to the tty driver to pend the clocks off until tx done.
 454          */
 455         serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
 456 }
 457
 458 static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 459 {
 460         struct qca_data *qca = from_timer(qca, t, tx_idle_timer);
 461         struct hci_uart *hu = qca->hu;
 462         unsigned long flags;
 463
 464         BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state);
 465
 466         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 467                                  flags, SINGLE_DEPTH_NESTING);
 468
 469         switch (qca->tx_ibs_state) {
 470         case HCI_IBS_TX_AWAKE:
 471                 /* TX_IDLE, go to SLEEP */
 472                 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
 473                         BT_ERR("Failed to send SLEEP to device");
 474                         break;
 475                 }
 476                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 477                 qca->ibs_sent_slps++;
 478                 queue_work(qca->workqueue, &qca->ws_tx_vote_off);
 479                 break;
 480
 481         case HCI_IBS_TX_ASLEEP:
 482         case HCI_IBS_TX_WAKING:
 483         default:
 484                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 485                 break;
 486         }
 487
 488         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 489 }
 490
 491 static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 492 {
 493         struct qca_data *qca = from_timer(qca, t, wake_retrans_timer);
 494         struct hci_uart *hu = qca->hu;
 495         unsigned long flags, retrans_delay;
 496         bool retransmit = false;
 497
 498         BT_DBG("hu %p wake retransmit timeout in %d state",
 499                 hu, qca->tx_ibs_state);
 500
 501         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
 502                                  flags, SINGLE_DEPTH_NESTING);
 503
 504         /* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */
 505         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 506                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 507                 return;
 508         }
 509
 510         switch (qca->tx_ibs_state) {
 511         case HCI_IBS_TX_WAKING:
 512                 /* No WAKE_ACK, retransmit WAKE */
 513                 retransmit = true;
 514                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
 515                         BT_ERR("Failed to acknowledge device wake up");
 516                         break;
 517                 }
 518                 qca->ibs_sent_wakes++;
 519                 retrans_delay = msecs_to_jiffies(qca->wake_retrans);
 520                 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
 521                 break;
 522
 523         case HCI_IBS_TX_ASLEEP:
 524         case HCI_IBS_TX_AWAKE:
 525         default:
 526                 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 527                 break;
 528         }
 529
 530         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 531
 532         if (retransmit)
 533                 hci_uart_tx_wakeup(hu);
 534 }
 535
 536
 537 static void qca_controller_memdump_timeout(struct work_struct *work)
 538 {
 539         struct qca_data *qca = container_of(work, struct qca_data,
 540                                         ctrl_memdump_timeout.work);
 541         struct hci_uart *hu = qca->hu;
 542
 543         mutex_lock(&qca->hci_memdump_lock);
 544         if (test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
 545                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
 546                 if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
 547                         /* Inject hw error event to reset the device
 548                          * and driver.
 549                          */
 550                         hci_reset_dev(hu->hdev);
 551                 }
 552         }
 553
 554         mutex_unlock(&qca->hci_memdump_lock);
 555 }
 556
 557
 558 /* Initialize protocol */
 559 static int qca_open(struct hci_uart *hu)
 560 {
 561         struct qca_serdev *qcadev;
 562         struct qca_data *qca;
 563
 564         BT_DBG("hu %p qca_open", hu);
 565
 566         if (!hci_uart_has_flow_control(hu))
 567                 return -EOPNOTSUPP;
 568
 569         qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL);
 570         if (!qca)
 571                 return -ENOMEM;
 572
 573         skb_queue_head_init(&qca->txq);
 574         skb_queue_head_init(&qca->tx_wait_q);
 575         skb_queue_head_init(&qca->rx_memdump_q);
 576         spin_lock_init(&qca->hci_ibs_lock);
 577         mutex_init(&qca->hci_memdump_lock);
 578         qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
 579         if (!qca->workqueue) {
 580                 BT_ERR("QCA Workqueue not initialized properly");
 581                 kfree(qca);
 582                 return -ENOMEM;
 583         }
 584
 585         INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx);
 586         INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device);
 587         INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off);
 588         INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off);
 589         INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
 590         INIT_DELAYED_WORK(&qca->ctrl_memdump_timeout,
 591                           qca_controller_memdump_timeout);
 592         init_waitqueue_head(&qca->suspend_wait_q);
 593
 594         qca->hu = hu;
 595         init_completion(&qca->drop_ev_comp);
 596
 597         /* Assume we start with both sides asleep -- extra wakes OK */
 598         qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
 599         qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 600
 601         qca->vote_last_jif = jiffies;
 602
 603         hu->priv = qca;
 604
 605         if (hu->serdev) {
 606                 qcadev = serdev_device_get_drvdata(hu->serdev);
 607
 608                 if (qca_is_wcn399x(qcadev->btsoc_type) ||
 609                     qca_is_wcn6750(qcadev->btsoc_type))
 610                         hu->init_speed = qcadev->init_speed;
 611
 612                 if (qcadev->oper_speed)
 613                         hu->oper_speed = qcadev->oper_speed;
 614         }
 615
 616         timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
 617         qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
 618
 619         timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
 620         qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS;
 621
 622         BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
 623                qca->tx_idle_delay, qca->wake_retrans);
 624
 625         return 0;
 626 }
 627
 628 static void qca_debugfs_init(struct hci_dev *hdev)
 629 {
 630         struct hci_uart *hu = hci_get_drvdata(hdev);
 631         struct qca_data *qca = hu->priv;
 632         struct dentry *ibs_dir;
 633         umode_t mode;
 634
 635         if (!hdev->debugfs)
 636                 return;
 637
 638         ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
 639
 640         /* read only */
 641         mode = 0444;
 642         debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
 643         debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
 644         debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
 645                            &qca->ibs_sent_slps);
 646         debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
 647                            &qca->ibs_sent_wakes);
 648         debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
 649                            &qca->ibs_sent_wacks);
 650         debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
 651                            &qca->ibs_recv_slps);
 652         debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
 653                            &qca->ibs_recv_wakes);
 654         debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
 655                            &qca->ibs_recv_wacks);
 656         debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote);
 657         debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
 658         debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
 659         debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote);
 660         debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
 661         debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
 662         debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
 663         debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
 664         debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
 665         debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
 666
 667         /* read/write */
 668         mode = 0644;
 669         debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
 670         debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
 671                            &qca->tx_idle_delay);
 672 }
 673
 674 /* Flush protocol data */
 675 static int qca_flush(struct hci_uart *hu)
 676 {
 677         struct qca_data *qca = hu->priv;
 678
 679         BT_DBG("hu %p qca flush", hu);
 680
 681         skb_queue_purge(&qca->tx_wait_q);
 682         skb_queue_purge(&qca->txq);
 683
 684         return 0;
 685 }
 686
 687 /* Close protocol */
 688 static int qca_close(struct hci_uart *hu)
 689 {
 690         struct qca_data *qca = hu->priv;
 691
 692         BT_DBG("hu %p qca close", hu);
 693
 694         serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
 695
 696         skb_queue_purge(&qca->tx_wait_q);
 697         skb_queue_purge(&qca->txq);
 698         skb_queue_purge(&qca->rx_memdump_q);
 699         destroy_workqueue(qca->workqueue);
 700         del_timer_sync(&qca->tx_idle_timer);
 701         del_timer_sync(&qca->wake_retrans_timer);
 702         qca->hu = NULL;
 703
 704         kfree_skb(qca->rx_skb);
 705
 706         hu->priv = NULL;
 707
 708         kfree(qca);
 709
 710         return 0;
 711 }
 712
 713 /* Called upon a wake-up-indication from the device.
 714  */
 715 static void device_want_to_wakeup(struct hci_uart *hu)
 716 {
 717         unsigned long flags;
 718         struct qca_data *qca = hu->priv;
 719
 720         BT_DBG("hu %p want to wake up", hu);
 721
 722         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 723
 724         qca->ibs_recv_wakes++;
 725
 726         /* Don't wake the rx up when suspending. */
 727         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 728                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 729                 return;
 730         }
 731
 732         switch (qca->rx_ibs_state) {
 733         case HCI_IBS_RX_ASLEEP:
 734                 /* Make sure clock is on - we may have turned clock off since
 735                  * receiving the wake up indicator awake rx clock.
 736                  */
 737                 queue_work(qca->workqueue, &qca->ws_awake_rx);
 738                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 739                 return;
 740
 741         case HCI_IBS_RX_AWAKE:
 742                 /* Always acknowledge device wake up,
 743                  * sending IBS message doesn't count as TX ON.
 744                  */
 745                 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
 746                         BT_ERR("Failed to acknowledge device wake up");
 747                         break;
 748                 }
 749                 qca->ibs_sent_wacks++;
 750                 break;
 751
 752         default:
 753                 /* Any other state is illegal */
 754                 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
 755                        qca->rx_ibs_state);
 756                 break;
 757         }
 758
 759         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 760
 761         /* Actually send the packets */
 762         hci_uart_tx_wakeup(hu);
 763 }
 764
 765 /* Called upon a sleep-indication from the device.
 766  */
 767 static void device_want_to_sleep(struct hci_uart *hu)
 768 {
 769         unsigned long flags;
 770         struct qca_data *qca = hu->priv;
 771
 772         BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state);
 773
 774         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 775
 776         qca->ibs_recv_slps++;
 777
 778         switch (qca->rx_ibs_state) {
 779         case HCI_IBS_RX_AWAKE:
 780                 /* Update state */
 781                 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP;
 782                 /* Vote off rx clock under workqueue */
 783                 queue_work(qca->workqueue, &qca->ws_rx_vote_off);
 784                 break;
 785
 786         case HCI_IBS_RX_ASLEEP:
 787                 break;
 788
 789         default:
 790                 /* Any other state is illegal */
 791                 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
 792                        qca->rx_ibs_state);
 793                 break;
 794         }
 795
 796         wake_up_interruptible(&qca->suspend_wait_q);
 797
 798         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 799 }
 800
 801 /* Called upon wake-up-acknowledgement from the device
 802  */
 803 static void device_woke_up(struct hci_uart *hu)
 804 {
 805         unsigned long flags, idle_delay;
 806         struct qca_data *qca = hu->priv;
 807         struct sk_buff *skb = NULL;
 808
 809         BT_DBG("hu %p woke up", hu);
 810
 811         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 812
 813         qca->ibs_recv_wacks++;
 814
 815         /* Don't react to the wake-up-acknowledgment when suspending. */
 816         if (test_bit(QCA_SUSPENDING, &qca->flags)) {
 817                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 818                 return;
 819         }
 820
 821         switch (qca->tx_ibs_state) {
 822         case HCI_IBS_TX_AWAKE:
 823                 /* Expect one if we send 2 WAKEs */
 824                 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d",
 825                        qca->tx_ibs_state);
 826                 break;
 827
 828         case HCI_IBS_TX_WAKING:
 829                 /* Send pending packets */
 830                 while ((skb = skb_dequeue(&qca->tx_wait_q)))
 831                         skb_queue_tail(&qca->txq, skb);
 832
 833                 /* Switch timers and change state to HCI_IBS_TX_AWAKE */
 834                 del_timer(&qca->wake_retrans_timer);
 835                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 836                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 837                 qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
 838                 break;
 839
 840         case HCI_IBS_TX_ASLEEP:
 841         default:
 842                 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 843                        qca->tx_ibs_state);
 844                 break;
 845         }
 846
 847         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 848
 849         /* Actually send the packets */
 850         hci_uart_tx_wakeup(hu);
 851 }
 852
 853 /* Enqueue frame for transmittion (padding, crc, etc) may be called from
 854  * two simultaneous tasklets.
 855  */
 856 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 857 {
 858         unsigned long flags = 0, idle_delay;
 859         struct qca_data *qca = hu->priv;
 860
 861         BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb,
 862                qca->tx_ibs_state);
 863
 864         if (test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
 865                 /* As SSR is in progress, ignore the packets */
 866                 bt_dev_dbg(hu->hdev, "SSR is in progress");
 867                 kfree_skb(skb);
 868                 return 0;
 869         }
 870
 871         /* Prepend skb with frame type */
 872         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 873
 874         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 875
 876         /* Don't go to sleep in middle of patch download or
 877          * Out-Of-Band(GPIOs control) sleep is selected.
 878          * Don't wake the device up when suspending.
 879          */
 880         if (test_bit(QCA_IBS_DISABLED, &qca->flags) ||
 881             test_bit(QCA_SUSPENDING, &qca->flags)) {
 882                 skb_queue_tail(&qca->txq, skb);
 883                 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 884                 return 0;
 885         }
 886
 887         /* Act according to current state */
 888         switch (qca->tx_ibs_state) {
 889         case HCI_IBS_TX_AWAKE:
 890                 BT_DBG("Device awake, sending normally");
 891                 skb_queue_tail(&qca->txq, skb);
 892                 idle_delay = msecs_to_jiffies(qca->tx_idle_delay);
 893                 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay);
 894                 break;
 895
 896         case HCI_IBS_TX_ASLEEP:
 897                 BT_DBG("Device asleep, waking up and queueing packet");
 898                 /* Save packet for later */
 899                 skb_queue_tail(&qca->tx_wait_q, skb);
 900
 901                 qca->tx_ibs_state = HCI_IBS_TX_WAKING;
 902                 /* Schedule a work queue to wake up device */
 903                 queue_work(qca->workqueue, &qca->ws_awake_device);
 904                 break;
 905
 906         case HCI_IBS_TX_WAKING:
 907                 BT_DBG("Device waking up, queueing packet");
 908                 /* Transient state; just keep packet for later */
 909                 skb_queue_tail(&qca->tx_wait_q, skb);
 910                 break;
 911
 912         default:
 913                 BT_ERR("Illegal tx state: %d (losing packet)",
 914                        qca->tx_ibs_state);
 915                 kfree_skb(skb);
 916                 break;
 917         }
 918
 919         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 920
 921         return 0;
 922 }
 923
 924 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
 925 {
 926         struct hci_uart *hu = hci_get_drvdata(hdev);
 927
 928         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
 929
 930         device_want_to_sleep(hu);
 931
 932         kfree_skb(skb);
 933         return 0;
 934 }
 935
 936 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
 937 {
 938         struct hci_uart *hu = hci_get_drvdata(hdev);
 939
 940         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
 941
 942         device_want_to_wakeup(hu);
 943
 944         kfree_skb(skb);
 945         return 0;
 946 }
 947
 948 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
 949 {
 950         struct hci_uart *hu = hci_get_drvdata(hdev);
 951
 952         BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
 953
 954         device_woke_up(hu);
 955
 956         kfree_skb(skb);
 957         return 0;
 958 }
 959
 960 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
 961 {
 962         /* We receive debug logs from chip as an ACL packets.
 963          * Instead of sending the data to ACL to decode the
 964          * received data, we are pushing them to the above layers
 965          * as a diagnostic packet.
 966          */
 967         if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
 968                 return hci_recv_diag(hdev, skb);
 969
 970         return hci_recv_frame(hdev, skb);
 971 }
 972
 973 static void qca_controller_memdump(struct work_struct *work)
 974 {
 975         struct qca_data *qca = container_of(work, struct qca_data,
 976                                             ctrl_memdump_evt);
 977         struct hci_uart *hu = qca->hu;
 978         struct sk_buff *skb;
 979         struct qca_memdump_event_hdr *cmd_hdr;
 980         struct qca_memdump_data *qca_memdump = qca->qca_memdump;
 981         struct qca_dump_size *dump;
 982         char *memdump_buf;
 983         char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 };
 984         u16 seq_no;
 985         u32 dump_size;
 986         u32 rx_size;
 987         enum qca_btsoc_type soc_type = qca_soc_type(hu);
 988
 989         while ((skb = skb_dequeue(&qca->rx_memdump_q))) {
 990
 991                 mutex_lock(&qca->hci_memdump_lock);
 992                 /* Skip processing the received packets if timeout detected
 993                  * or memdump collection completed.
 994                  */
 995                 if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
 996                     qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
 997                         mutex_unlock(&qca->hci_memdump_lock);
 998                         return;
 999                 }
1000
1001                 if (!qca_memdump) {
1002                         qca_memdump = kzalloc(sizeof(struct qca_memdump_data),
1003                                               GFP_ATOMIC);
1004                         if (!qca_memdump) {
1005                                 mutex_unlock(&qca->hci_memdump_lock);
1006                                 return;
1007                         }
1008
1009                         qca->qca_memdump = qca_memdump;
1010                 }
1011
1012                 qca->memdump_state = QCA_MEMDUMP_COLLECTING;
1013                 cmd_hdr = (void *) skb->data;
1014                 seq_no = __le16_to_cpu(cmd_hdr->seq_no);
1015                 skb_pull(skb, sizeof(struct qca_memdump_event_hdr));
1016
1017                 if (!seq_no) {
1018
1019                         /* This is the first frame of memdump packet from
1020                          * the controller, Disable IBS to recevie dump
1021                          * with out any interruption, ideally time required for
1022                          * the controller to send the dump is 8 seconds. let us
1023                          * start timer to handle this asynchronous activity.
1024                          */
1025                         set_bit(QCA_IBS_DISABLED, &qca->flags);
1026                         set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1027                         dump = (void *) skb->data;
1028                         dump_size = __le32_to_cpu(dump->dump_size);
1029                         if (!(dump_size)) {
1030                                 bt_dev_err(hu->hdev, "Rx invalid memdump size");
1031                                 kfree(qca_memdump);
1032                                 kfree_skb(skb);
1033                                 qca->qca_memdump = NULL;
1034                                 mutex_unlock(&qca->hci_memdump_lock);
1035                                 return;
1036                         }
1037
1038                         bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
1039                                     dump_size);
1040                         queue_delayed_work(qca->workqueue,
1041                                            &qca->ctrl_memdump_timeout,
1042                                            msecs_to_jiffies(MEMDUMP_TIMEOUT_MS)
1043                                           );
1044
1045                         skb_pull(skb, sizeof(dump_size));
1046                         memdump_buf = vmalloc(dump_size);
1047                         qca_memdump->ram_dump_size = dump_size;
1048                         qca_memdump->memdump_buf_head = memdump_buf;
1049                         qca_memdump->memdump_buf_tail = memdump_buf;
1050                 }
1051
1052                 memdump_buf = qca_memdump->memdump_buf_tail;
1053
1054                 /* If sequence no 0 is missed then there is no point in
1055                  * accepting the other sequences.
1056                  */
1057                 if (!memdump_buf) {
1058                         bt_dev_err(hu->hdev, "QCA: Discarding other packets");
1059                         kfree(qca_memdump);
1060                         kfree_skb(skb);
1061                         qca->qca_memdump = NULL;
1062                         mutex_unlock(&qca->hci_memdump_lock);
1063                         return;
1064                 }
1065
1066                 /* There could be chance of missing some packets from
1067                  * the controller. In such cases let us store the dummy
1068                  * packets in the buffer.
1069                  */
1070                 /* For QCA6390, controller does not lost packets but
1071                  * sequence number field of packet sometimes has error
1072                  * bits, so skip this checking for missing packet.
1073                  */
1074                 while ((seq_no > qca_memdump->current_seq_no + 1) &&
1075                        (soc_type != QCA_QCA6390) &&
1076                        seq_no != QCA_LAST_SEQUENCE_NUM) {
1077                         bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
1078                                    qca_memdump->current_seq_no);
1079                         rx_size = qca_memdump->received_dump;
1080                         rx_size += QCA_DUMP_PACKET_SIZE;
1081                         if (rx_size > qca_memdump->ram_dump_size) {
1082                                 bt_dev_err(hu->hdev,
1083                                            "QCA memdump received %d, no space for missed packet",
1084                                            qca_memdump->received_dump);
1085                                 break;
1086                         }
1087                         memcpy(memdump_buf, nullBuff, QCA_DUMP_PACKET_SIZE);
1088                         memdump_buf = memdump_buf + QCA_DUMP_PACKET_SIZE;
1089                         qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
1090                         qca_memdump->current_seq_no++;
1091                 }
1092
1093                 rx_size = qca_memdump->received_dump + skb->len;
1094                 if (rx_size <= qca_memdump->ram_dump_size) {
1095                         if ((seq_no != QCA_LAST_SEQUENCE_NUM) &&
1096                             (seq_no != qca_memdump->current_seq_no))
1097                                 bt_dev_err(hu->hdev,
1098                                            "QCA memdump unexpected packet %d",
1099                                            seq_no);
1100                         bt_dev_dbg(hu->hdev,
1101                                    "QCA memdump packet %d with length %d",
1102                                    seq_no, skb->len);
1103                         memcpy(memdump_buf, (unsigned char *)skb->data,
1104                                skb->len);
1105                         memdump_buf = memdump_buf + skb->len;
1106                         qca_memdump->memdump_buf_tail = memdump_buf;
1107                         qca_memdump->current_seq_no = seq_no + 1;
1108                         qca_memdump->received_dump += skb->len;
1109                 } else {
1110                         bt_dev_err(hu->hdev,
1111                                    "QCA memdump received %d, no space for packet %d",
1112                                    qca_memdump->received_dump, seq_no);
1113                 }
1114                 qca->qca_memdump = qca_memdump;
1115                 kfree_skb(skb);
1116                 if (seq_no == QCA_LAST_SEQUENCE_NUM) {
1117                         bt_dev_info(hu->hdev,
1118                                     "QCA memdump Done, received %d, total %d",
1119                                     qca_memdump->received_dump,
1120                                     qca_memdump->ram_dump_size);
1121                         memdump_buf = qca_memdump->memdump_buf_head;
1122                         dev_coredumpv(&hu->serdev->dev, memdump_buf,
1123                                       qca_memdump->received_dump, GFP_KERNEL);
1124                         cancel_delayed_work(&qca->ctrl_memdump_timeout);
1125                         kfree(qca->qca_memdump);
1126                         qca->qca_memdump = NULL;
1127                         qca->memdump_state = QCA_MEMDUMP_COLLECTED;
1128                         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1129                 }
1130
1131                 mutex_unlock(&qca->hci_memdump_lock);
1132         }
1133
1134 }
1135
1136 static int qca_controller_memdump_event(struct hci_dev *hdev,
1137                                         struct sk_buff *skb)
1138 {
1139         struct hci_uart *hu = hci_get_drvdata(hdev);
1140         struct qca_data *qca = hu->priv;
1141
1142         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1143         skb_queue_tail(&qca->rx_memdump_q, skb);
1144         queue_work(qca->workqueue, &qca->ctrl_memdump_evt);
1145
1146         return 0;
1147 }
1148
1149 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
1150 {
1151         struct hci_uart *hu = hci_get_drvdata(hdev);
1152         struct qca_data *qca = hu->priv;
1153
1154         if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
1155                 struct hci_event_hdr *hdr = (void *)skb->data;
1156
1157                 /* For the WCN3990 the vendor command for a baudrate change
1158                  * isn't sent as synchronous HCI command, because the
1159                  * controller sends the corresponding vendor event with the
1160                  * new baudrate. The event is received and properly decoded
1161                  * after changing the baudrate of the host port. It needs to
1162                  * be dropped, otherwise it can be misinterpreted as
1163                  * response to a later firmware download command (also a
1164                  * vendor command).
1165                  */
1166
1167                 if (hdr->evt == HCI_EV_VENDOR)
1168                         complete(&qca->drop_ev_comp);
1169
1170                 kfree_skb(skb);
1171
1172                 return 0;
1173         }
1174         /* We receive chip memory dump as an event packet, With a dedicated
1175          * handler followed by a hardware error event. When this event is
1176          * received we store dump into a file before closing hci. This
1177          * dump will help in triaging the issues.
1178          */
1179         if ((skb->data[0] == HCI_VENDOR_PKT) &&
1180             (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
1181                 return qca_controller_memdump_event(hdev, skb);
1182
1183         return hci_recv_frame(hdev, skb);
1184 }
1185
1186 #define QCA_IBS_SLEEP_IND_EVENT \
1187         .type = HCI_IBS_SLEEP_IND, \
1188         .hlen = 0, \
1189         .loff = 0, \
1190         .lsize = 0, \
1191         .maxlen = HCI_MAX_IBS_SIZE
1192
1193 #define QCA_IBS_WAKE_IND_EVENT \
1194         .type = HCI_IBS_WAKE_IND, \
1195         .hlen = 0, \
1196         .loff = 0, \
1197         .lsize = 0, \
1198         .maxlen = HCI_MAX_IBS_SIZE
1199
1200 #define QCA_IBS_WAKE_ACK_EVENT \
1201         .type = HCI_IBS_WAKE_ACK, \
1202         .hlen = 0, \
1203         .loff = 0, \
1204         .lsize = 0, \
1205         .maxlen = HCI_MAX_IBS_SIZE
1206
1207 static const struct h4_recv_pkt qca_recv_pkts[] = {
1208         { H4_RECV_ACL,             .recv = qca_recv_acl_data },
1209         { H4_RECV_SCO,             .recv = hci_recv_frame    },
1210         { H4_RECV_EVENT,           .recv = qca_recv_event    },
1211         { QCA_IBS_WAKE_IND_EVENT,  .recv = qca_ibs_wake_ind  },
1212         { QCA_IBS_WAKE_ACK_EVENT,  .recv = qca_ibs_wake_ack  },
1213         { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
1214 };
1215
1216 static int qca_recv(struct hci_uart *hu, const void *data, int count)
1217 {
1218         struct qca_data *qca = hu->priv;
1219
1220         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
1221                 return -EUNATCH;
1222
1223         qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count,
1224                                   qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts));
1225         if (IS_ERR(qca->rx_skb)) {
1226                 int err = PTR_ERR(qca->rx_skb);
1227                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
1228                 qca->rx_skb = NULL;
1229                 return err;
1230         }
1231
1232         return count;
1233 }
1234
1235 static struct sk_buff *qca_dequeue(struct hci_uart *hu)
1236 {
1237         struct qca_data *qca = hu->priv;
1238
1239         return skb_dequeue(&qca->txq);
1240 }
1241
1242 static uint8_t qca_get_baudrate_value(int speed)
1243 {
1244         switch (speed) {
1245         case 9600:
1246                 return QCA_BAUDRATE_9600;
1247         case 19200:
1248                 return QCA_BAUDRATE_19200;
1249         case 38400:
1250                 return QCA_BAUDRATE_38400;
1251         case 57600:
1252                 return QCA_BAUDRATE_57600;
1253         case 115200:
1254                 return QCA_BAUDRATE_115200;
1255         case 230400:
1256                 return QCA_BAUDRATE_230400;
1257         case 460800:
1258                 return QCA_BAUDRATE_460800;
1259         case 500000:
1260                 return QCA_BAUDRATE_500000;
1261         case 921600:
1262                 return QCA_BAUDRATE_921600;
1263         case 1000000:
1264                 return QCA_BAUDRATE_1000000;
1265         case 2000000:
1266                 return QCA_BAUDRATE_2000000;
1267         case 3000000:
1268                 return QCA_BAUDRATE_3000000;
1269         case 3200000:
1270                 return QCA_BAUDRATE_3200000;
1271         case 3500000:
1272                 return QCA_BAUDRATE_3500000;
1273         default:
1274                 return QCA_BAUDRATE_115200;
1275         }
1276 }
1277
1278 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
1279 {
1280         struct hci_uart *hu = hci_get_drvdata(hdev);
1281         struct qca_data *qca = hu->priv;
1282         struct sk_buff *skb;
1283         u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
1284
1285         if (baudrate > QCA_BAUDRATE_3200000)
1286                 return -EINVAL;
1287
1288         cmd[4] = baudrate;
1289
1290         skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
1291         if (!skb) {
1292                 bt_dev_err(hdev, "Failed to allocate baudrate packet");
1293                 return -ENOMEM;
1294         }
1295
1296         /* Assign commands to change baudrate and packet type. */
1297         skb_put_data(skb, cmd, sizeof(cmd));
1298         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1299
1300         skb_queue_tail(&qca->txq, skb);
1301         hci_uart_tx_wakeup(hu);
1302
1303         /* Wait for the baudrate change request to be sent */
1304
1305         while (!skb_queue_empty(&qca->txq))
1306                 usleep_range(100, 200);
1307
1308         if (hu->serdev)
1309                 serdev_device_wait_until_sent(hu->serdev,
1310                       msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
1311
1312         /* Give the controller time to process the request */
1313         if (qca_is_wcn399x(qca_soc_type(hu)) ||
1314             qca_is_wcn6750(qca_soc_type(hu)))
1315                 usleep_range(1000, 10000);
1316         else
1317                 msleep(300);
1318
1319         return 0;
1320 }
1321
1322 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
1323 {
1324         if (hu->serdev)
1325                 serdev_device_set_baudrate(hu->serdev, speed);
1326         else
1327                 hci_uart_set_baudrate(hu, speed);
1328 }
1329
1330 static int qca_send_power_pulse(struct hci_uart *hu, bool on)
1331 {
1332         int ret;
1333         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
1334         u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;
1335
1336         /* These power pulses are single byte command which are sent
1337          * at required baudrate to wcn3990. On wcn3990, we have an external
1338          * circuit at Tx pin which decodes the pulse sent at specific baudrate.
1339          * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
1340          * and also we use the same power inputs to turn on and off for
1341          * Wi-Fi/BT. Powering up the power sources will not enable BT, until
1342          * we send a power on pulse at 115200 bps. This algorithm will help to
1343          * save power. Disabling hardware flow control is mandatory while
1344          * sending power pulses to SoC.
1345          */
1346         bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
1347
1348         serdev_device_write_flush(hu->serdev);
1349         hci_uart_set_flow_control(hu, true);
1350         ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
1351         if (ret < 0) {
1352                 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
1353                 return ret;
1354         }
1355
1356         serdev_device_wait_until_sent(hu->serdev, timeout);
1357         hci_uart_set_flow_control(hu, false);
1358
1359         /* Give to controller time to boot/shutdown */
1360         if (on)
1361                 msleep(100);
1362         else
1363                 usleep_range(1000, 10000);
1364
1365         return 0;
1366 }
1367
1368 static unsigned int qca_get_speed(struct hci_uart *hu,
1369                                   enum qca_speed_type speed_type)
1370 {
1371         unsigned int speed = 0;
1372
1373         if (speed_type == QCA_INIT_SPEED) {
1374                 if (hu->init_speed)
1375                         speed = hu->init_speed;
1376                 else if (hu->proto->init_speed)
1377                         speed = hu->proto->init_speed;
1378         } else {
1379                 if (hu->oper_speed)
1380                         speed = hu->oper_speed;
1381                 else if (hu->proto->oper_speed)
1382                         speed = hu->proto->oper_speed;
1383         }
1384
1385         return speed;
1386 }
1387
1388 static int qca_check_speeds(struct hci_uart *hu)
1389 {
1390         if (qca_is_wcn399x(qca_soc_type(hu)) ||
1391             qca_is_wcn6750(qca_soc_type(hu))) {
1392                 if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
1393                     !qca_get_speed(hu, QCA_OPER_SPEED))
1394                         return -EINVAL;
1395         } else {
1396                 if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
1397                     !qca_get_speed(hu, QCA_OPER_SPEED))
1398                         return -EINVAL;
1399         }
1400
1401         return 0;
1402 }
1403
1404 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
1405 {
1406         unsigned int speed, qca_baudrate;
1407         struct qca_data *qca = hu->priv;
1408         int ret = 0;
1409
1410         if (speed_type == QCA_INIT_SPEED) {
1411                 speed = qca_get_speed(hu, QCA_INIT_SPEED);
1412                 if (speed)
1413                         host_set_baudrate(hu, speed);
1414         } else {
1415                 enum qca_btsoc_type soc_type = qca_soc_type(hu);
1416
1417                 speed = qca_get_speed(hu, QCA_OPER_SPEED);
1418                 if (!speed)
1419                         return 0;
1420
1421                 /* Disable flow control for wcn3990 to deassert RTS while
1422                  * changing the baudrate of chip and host.
1423                  */
1424                 if (qca_is_wcn399x(soc_type) ||
1425                     qca_is_wcn6750(soc_type))
1426                         hci_uart_set_flow_control(hu, true);
1427
1428                 if (soc_type == QCA_WCN3990) {
1429                         reinit_completion(&qca->drop_ev_comp);
1430                         set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1431                 }
1432
1433                 qca_baudrate = qca_get_baudrate_value(speed);
1434                 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
1435                 ret = qca_set_baudrate(hu->hdev, qca_baudrate);
1436                 if (ret)
1437                         goto error;
1438
1439                 host_set_baudrate(hu, speed);
1440
1441 error:
1442                 if (qca_is_wcn399x(soc_type) ||
1443                     qca_is_wcn6750(soc_type))
1444                         hci_uart_set_flow_control(hu, false);
1445
1446                 if (soc_type == QCA_WCN3990) {
1447                         /* Wait for the controller to send the vendor event
1448                          * for the baudrate change command.
1449                          */
1450                         if (!wait_for_completion_timeout(&qca->drop_ev_comp,
1451                                                  msecs_to_jiffies(100))) {
1452                                 bt_dev_err(hu->hdev,
1453                                            "Failed to change controller baudrate\n");
1454                                 ret = -ETIMEDOUT;
1455                         }
1456
1457                         clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
1458                 }
1459         }
1460
1461         return ret;
1462 }
1463
1464 static int qca_send_crashbuffer(struct hci_uart *hu)
1465 {
1466         struct qca_data *qca = hu->priv;
1467         struct sk_buff *skb;
1468
1469         skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
1470         if (!skb) {
1471                 bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
1472                 return -ENOMEM;
1473         }
1474
1475         /* We forcefully crash the controller, by sending 0xfb byte for
1476          * 1024 times. We also might have chance of losing data, To be
1477          * on safer side we send 1096 bytes to the SoC.
1478          */
1479         memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
1480                QCA_CRASHBYTE_PACKET_LEN);
1481         hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
1482         bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
1483         skb_queue_tail(&qca->txq, skb);
1484         hci_uart_tx_wakeup(hu);
1485
1486         return 0;
1487 }
1488
1489 static void qca_wait_for_dump_collection(struct hci_dev *hdev)
1490 {
1491         struct hci_uart *hu = hci_get_drvdata(hdev);
1492         struct qca_data *qca = hu->priv;
1493
1494         wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
1495                             TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);
1496
1497         clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1498 }
1499
1500 static void qca_hw_error(struct hci_dev *hdev, u8 code)
1501 {
1502         struct hci_uart *hu = hci_get_drvdata(hdev);
1503         struct qca_data *qca = hu->priv;
1504
1505         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1506         set_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1507         bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);
1508
1509         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1510                 /* If hardware error event received for other than QCA
1511                  * soc memory dump event, then we need to crash the SOC
1512                  * and wait here for 8 seconds to get the dump packets.
1513                  * This will block main thread to be on hold until we
1514                  * collect dump.
1515                  */
1516                 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1517                 qca_send_crashbuffer(hu);
1518                 qca_wait_for_dump_collection(hdev);
1519         } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1520                 /* Let us wait here until memory dump collected or
1521                  * memory dump timer expired.
1522                  */
1523                 bt_dev_info(hdev, "waiting for dump to complete");
1524                 qca_wait_for_dump_collection(hdev);
1525         }
1526
1527         mutex_lock(&qca->hci_memdump_lock);
1528         if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1529                 bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
1530                 if (qca->qca_memdump) {
1531                         vfree(qca->qca_memdump->memdump_buf_head);
1532                         kfree(qca->qca_memdump);
1533                         qca->qca_memdump = NULL;
1534                 }
1535                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1536                 cancel_delayed_work(&qca->ctrl_memdump_timeout);
1537         }
1538         mutex_unlock(&qca->hci_memdump_lock);
1539
1540         if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
1541             qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
1542                 cancel_work_sync(&qca->ctrl_memdump_evt);
1543                 skb_queue_purge(&qca->rx_memdump_q);
1544         }
1545
1546         clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);
1547 }
1548
1549 static void qca_cmd_timeout(struct hci_dev *hdev)
1550 {
1551         struct hci_uart *hu = hci_get_drvdata(hdev);
1552         struct qca_data *qca = hu->priv;
1553
1554         set_bit(QCA_SSR_TRIGGERED, &qca->flags);
1555         if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
1556                 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
1557                 qca_send_crashbuffer(hu);
1558                 qca_wait_for_dump_collection(hdev);
1559         } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
1560                 /* Let us wait here until memory dump collected or
1561                  * memory dump timer expired.
1562                  */
1563                 bt_dev_info(hdev, "waiting for dump to complete");
1564                 qca_wait_for_dump_collection(hdev);
1565         }
1566
1567         mutex_lock(&qca->hci_memdump_lock);
1568         if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
1569                 qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
1570                 if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
1571                         /* Inject hw error event to reset the device
1572                          * and driver.
1573                          */
1574                         hci_reset_dev(hu->hdev);
1575                 }
1576         }
1577         mutex_unlock(&qca->hci_memdump_lock);
1578 }
1579
1580 static bool qca_wakeup(struct hci_dev *hdev)
1581 {
1582         struct hci_uart *hu = hci_get_drvdata(hdev);
1583         bool wakeup;
1584
1585         /* UART driver handles the interrupt from BT SoC.So we need to use
1586          * device handle of UART driver to get the status of device may wakeup.
1587          */
1588         wakeup = device_may_wakeup(hu->serdev->ctrl->dev.parent);
1589         bt_dev_dbg(hu->hdev, "wakeup status : %d", wakeup);
1590
1591         return wakeup;
1592 }
1593
1594 static int qca_regulator_init(struct hci_uart *hu)
1595 {
1596         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1597         struct qca_serdev *qcadev;
1598         int ret;
1599         bool sw_ctrl_state;
1600
1601         /* Check for vregs status, may be hci down has turned
1602          * off the voltage regulator.
1603          */
1604         qcadev = serdev_device_get_drvdata(hu->serdev);
1605         if (!qcadev->bt_power->vregs_on) {
1606                 serdev_device_close(hu->serdev);
1607                 ret = qca_regulator_enable(qcadev);
1608                 if (ret)
1609                         return ret;
1610
1611                 ret = serdev_device_open(hu->serdev);
1612                 if (ret) {
1613                         bt_dev_err(hu->hdev, "failed to open port");
1614                         return ret;
1615                 }
1616         }
1617
1618         if (qca_is_wcn399x(soc_type)) {
1619                 /* Forcefully enable wcn399x to enter in to boot mode. */
1620                 host_set_baudrate(hu, 2400);
1621                 ret = qca_send_power_pulse(hu, false);
1622                 if (ret)
1623                         return ret;
1624         }
1625
1626         /* For wcn6750 need to enable gpio bt_en */
1627         if (qcadev->bt_en) {
1628                 gpiod_set_value_cansleep(qcadev->bt_en, 0);
1629                 msleep(50);
1630                 gpiod_set_value_cansleep(qcadev->bt_en, 1);
1631                 msleep(50);
1632                 if (qcadev->sw_ctrl) {
1633                         sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
1634                         bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
1635                 }
1636         }
1637
1638         qca_set_speed(hu, QCA_INIT_SPEED);
1639
1640         if (qca_is_wcn399x(soc_type)) {
1641                 ret = qca_send_power_pulse(hu, true);
1642                 if (ret)
1643                         return ret;
1644         }
1645
1646         /* Now the device is in ready state to communicate with host.
1647          * To sync host with device we need to reopen port.
1648          * Without this, we will have RTS and CTS synchronization
1649          * issues.
1650          */
1651         serdev_device_close(hu->serdev);
1652         ret = serdev_device_open(hu->serdev);
1653         if (ret) {
1654                 bt_dev_err(hu->hdev, "failed to open port");
1655                 return ret;
1656         }
1657
1658         hci_uart_set_flow_control(hu, false);
1659
1660         return 0;
1661 }
1662
1663 static int qca_power_on(struct hci_dev *hdev)
1664 {
1665         struct hci_uart *hu = hci_get_drvdata(hdev);
1666         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1667         struct qca_serdev *qcadev;
1668         struct qca_data *qca = hu->priv;
1669         int ret = 0;
1670
1671         /* Non-serdev device usually is powered by external power
1672          * and don't need additional action in driver for power on
1673          */
1674         if (!hu->serdev)
1675                 return 0;
1676
1677         if (qca_is_wcn399x(soc_type) ||
1678             qca_is_wcn6750(soc_type)) {
1679                 ret = qca_regulator_init(hu);
1680         } else {
1681                 qcadev = serdev_device_get_drvdata(hu->serdev);
1682                 if (qcadev->bt_en) {
1683                         gpiod_set_value_cansleep(qcadev->bt_en, 1);
1684                         /* Controller needs time to bootup. */
1685                         msleep(150);
1686                 }
1687         }
1688
1689         clear_bit(QCA_BT_OFF, &qca->flags);
1690         return ret;
1691 }
1692
1693 static int qca_setup(struct hci_uart *hu)
1694 {
1695         struct hci_dev *hdev = hu->hdev;
1696         struct qca_data *qca = hu->priv;
1697         unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
1698         unsigned int retries = 0;
1699         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1700         const char *firmware_name = qca_get_firmware_name(hu);
1701         int ret;
1702         struct qca_btsoc_version ver;
1703
1704         ret = qca_check_speeds(hu);
1705         if (ret)
1706                 return ret;
1707
1708         clear_bit(QCA_ROM_FW, &qca->flags);
1709         /* Patch downloading has to be done without IBS mode */
1710         set_bit(QCA_IBS_DISABLED, &qca->flags);
1711
1712         /* Enable controller to do both LE scan and BR/EDR inquiry
1713          * simultaneously.
1714          */
1715         set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
1716
1717         bt_dev_info(hdev, "setting up %s",
1718                 qca_is_wcn399x(soc_type) ? "wcn399x" :
1719                 (soc_type == QCA_WCN6750) ? "wcn6750" : "ROME/QCA6390");
1720
1721         qca->memdump_state = QCA_MEMDUMP_IDLE;
1722
1723 retry:
1724         ret = qca_power_on(hdev);
1725         if (ret)
1726                 goto out;
1727
1728         clear_bit(QCA_SSR_TRIGGERED, &qca->flags);
1729
1730         if (qca_is_wcn399x(soc_type) ||
1731             qca_is_wcn6750(soc_type)) {
1732                 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
1733                 hci_set_aosp_capable(hdev);
1734
1735                 ret = qca_read_soc_version(hdev, &ver, soc_type);
1736                 if (ret)
1737                         goto out;
1738         } else {
1739                 qca_set_speed(hu, QCA_INIT_SPEED);
1740         }
1741
1742         /* Setup user speed if needed */
1743         speed = qca_get_speed(hu, QCA_OPER_SPEED);
1744         if (speed) {
1745                 ret = qca_set_speed(hu, QCA_OPER_SPEED);
1746                 if (ret)
1747                         goto out;
1748
1749                 qca_baudrate = qca_get_baudrate_value(speed);
1750         }
1751
1752         if (!(qca_is_wcn399x(soc_type) ||
1753              qca_is_wcn6750(soc_type))) {
1754                 /* Get QCA version information */
1755                 ret = qca_read_soc_version(hdev, &ver, soc_type);
1756                 if (ret)
1757                         goto out;
1758         }
1759
1760         /* Setup patch / NVM configurations */
1761         ret = qca_uart_setup(hdev, qca_baudrate, soc_type, ver,
1762                         firmware_name);
1763         if (!ret) {
1764                 clear_bit(QCA_IBS_DISABLED, &qca->flags);
1765                 qca_debugfs_init(hdev);
1766                 hu->hdev->hw_error = qca_hw_error;
1767                 hu->hdev->cmd_timeout = qca_cmd_timeout;
1768                 hu->hdev->wakeup = qca_wakeup;
1769         } else if (ret == -ENOENT) {
1770                 /* No patch/nvm-config found, run with original fw/config */
1771                 set_bit(QCA_ROM_FW, &qca->flags);
1772                 ret = 0;
1773         } else if (ret == -EAGAIN) {
1774                 /*
1775                  * Userspace firmware loader will return -EAGAIN in case no
1776                  * patch/nvm-config is found, so run with original fw/config.
1777                  */
1778                 set_bit(QCA_ROM_FW, &qca->flags);
1779                 ret = 0;
1780         }
1781
1782 out:
1783         if (ret && retries < MAX_INIT_RETRIES) {
1784                 bt_dev_warn(hdev, "Retry BT power ON:%d", retries);
1785                 qca_power_shutdown(hu);
1786                 if (hu->serdev) {
1787                         serdev_device_close(hu->serdev);
1788                         ret = serdev_device_open(hu->serdev);
1789                         if (ret) {
1790                                 bt_dev_err(hdev, "failed to open port");
1791                                 return ret;
1792                         }
1793                 }
1794                 retries++;
1795                 goto retry;
1796         }
1797
1798         /* Setup bdaddr */
1799         if (soc_type == QCA_ROME)
1800                 hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
1801         else
1802                 hu->hdev->set_bdaddr = qca_set_bdaddr;
1803
1804         return ret;
1805 }
1806
1807 static const struct hci_uart_proto qca_proto = {
1808         .id             = HCI_UART_QCA,
1809         .name           = "QCA",
1810         .manufacturer   = 29,
1811         .init_speed     = 115200,
1812         .oper_speed     = 3000000,
1813         .open           = qca_open,
1814         .close          = qca_close,
1815         .flush          = qca_flush,
1816         .setup          = qca_setup,
1817         .recv           = qca_recv,
1818         .enqueue        = qca_enqueue,
1819         .dequeue        = qca_dequeue,
1820 };
1821
1822 static const struct qca_device_data qca_soc_data_wcn3990 = {
1823         .soc_type = QCA_WCN3990,
1824         .vregs = (struct qca_vreg []) {
1825                 { "vddio", 15000  },
1826                 { "vddxo", 80000  },
1827                 { "vddrf", 300000 },
1828                 { "vddch0", 450000 },
1829         },
1830         .num_vregs = 4,
1831 };
1832
1833 static const struct qca_device_data qca_soc_data_wcn3991 = {
1834         .soc_type = QCA_WCN3991,
1835         .vregs = (struct qca_vreg []) {
1836                 { "vddio", 15000  },
1837                 { "vddxo", 80000  },
1838                 { "vddrf", 300000 },
1839                 { "vddch0", 450000 },
1840         },
1841         .num_vregs = 4,
1842         .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
1843 };
1844
1845 static const struct qca_device_data qca_soc_data_wcn3998 = {
1846         .soc_type = QCA_WCN3998,
1847         .vregs = (struct qca_vreg []) {
1848                 { "vddio", 10000  },
1849                 { "vddxo", 80000  },
1850                 { "vddrf", 300000 },
1851                 { "vddch0", 450000 },
1852         },
1853         .num_vregs = 4,
1854 };
1855
1856 static const struct qca_device_data qca_soc_data_qca6390 = {
1857         .soc_type = QCA_QCA6390,
1858         .num_vregs = 0,
1859 };
1860
1861 static const struct qca_device_data qca_soc_data_wcn6750 = {
1862         .soc_type = QCA_WCN6750,
1863         .vregs = (struct qca_vreg []) {
1864                 { "vddio", 5000 },
1865                 { "vddaon", 26000 },
1866                 { "vddbtcxmx", 126000 },
1867                 { "vddrfacmn", 12500 },
1868                 { "vddrfa0p8", 102000 },
1869                 { "vddrfa1p7", 302000 },
1870                 { "vddrfa1p2", 257000 },
1871                 { "vddrfa2p2", 1700000 },
1872                 { "vddasd", 200 },
1873         },
1874         .num_vregs = 9,
1875         .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
1876 };
1877
1878 static void qca_power_shutdown(struct hci_uart *hu)
1879 {
1880         struct qca_serdev *qcadev;
1881         struct qca_data *qca = hu->priv;
1882         unsigned long flags;
1883         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1884         bool sw_ctrl_state;
1885
1886         /* From this point we go into power off state. But serial port is
1887          * still open, stop queueing the IBS data and flush all the buffered
1888          * data in skb's.
1889          */
1890         spin_lock_irqsave(&qca->hci_ibs_lock, flags);
1891         set_bit(QCA_IBS_DISABLED, &qca->flags);
1892         qca_flush(hu);
1893         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
1894
1895         /* Non-serdev device usually is powered by external power
1896          * and don't need additional action in driver for power down
1897          */
1898         if (!hu->serdev)
1899                 return;
1900
1901         qcadev = serdev_device_get_drvdata(hu->serdev);
1902
1903         if (qca_is_wcn399x(soc_type)) {
1904                 host_set_baudrate(hu, 2400);
1905                 qca_send_power_pulse(hu, false);
1906                 qca_regulator_disable(qcadev);
1907         } else if (soc_type == QCA_WCN6750) {
1908                 gpiod_set_value_cansleep(qcadev->bt_en, 0);
1909                 msleep(100);
1910                 qca_regulator_disable(qcadev);
1911                 if (qcadev->sw_ctrl) {
1912                         sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
1913                         bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
1914                 }
1915         } else if (qcadev->bt_en) {
1916                 gpiod_set_value_cansleep(qcadev->bt_en, 0);
1917         }
1918
1919         set_bit(QCA_BT_OFF, &qca->flags);
1920 }
1921
1922 static int qca_power_off(struct hci_dev *hdev)
1923 {
1924         struct hci_uart *hu = hci_get_drvdata(hdev);
1925         struct qca_data *qca = hu->priv;
1926         enum qca_btsoc_type soc_type = qca_soc_type(hu);
1927
1928         hu->hdev->hw_error = NULL;
1929         hu->hdev->cmd_timeout = NULL;
1930
1931         del_timer_sync(&qca->wake_retrans_timer);
1932         del_timer_sync(&qca->tx_idle_timer);
1933
1934         /* Stop sending shutdown command if soc crashes. */
1935         if (soc_type != QCA_ROME
1936                 && qca->memdump_state == QCA_MEMDUMP_IDLE) {
1937                 qca_send_pre_shutdown_cmd(hdev);
1938                 usleep_range(8000, 10000);
1939         }
1940
1941         qca_power_shutdown(hu);
1942         return 0;
1943 }
1944
1945 static int qca_regulator_enable(struct qca_serdev *qcadev)
1946 {
1947         struct qca_power *power = qcadev->bt_power;
1948         int ret;
1949
1950         /* Already enabled */
1951         if (power->vregs_on)
1952                 return 0;
1953
1954         BT_DBG("enabling %d regulators)", power->num_vregs);
1955
1956         ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
1957         if (ret)
1958                 return ret;
1959
1960         power->vregs_on = true;
1961
1962         ret = clk_prepare_enable(qcadev->susclk);
1963         if (ret)
1964                 qca_regulator_disable(qcadev);
1965
1966         return ret;
1967 }
1968
1969 static void qca_regulator_disable(struct qca_serdev *qcadev)
1970 {
1971         struct qca_power *power;
1972
1973         if (!qcadev)
1974                 return;
1975
1976         power = qcadev->bt_power;
1977
1978         /* Already disabled? */
1979         if (!power->vregs_on)
1980                 return;
1981
1982         regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
1983         power->vregs_on = false;
1984
1985         clk_disable_unprepare(qcadev->susclk);
1986 }
1987
1988 static int qca_init_regulators(struct qca_power *qca,
1989                                 const struct qca_vreg *vregs, size_t num_vregs)
1990 {
1991         struct regulator_bulk_data *bulk;
1992         int ret;
1993         int i;
1994
1995         bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
1996         if (!bulk)
1997                 return -ENOMEM;
1998
1999         for (i = 0; i < num_vregs; i++)
2000                 bulk[i].supply = vregs[i].name;
2001
2002         ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
2003         if (ret < 0)
2004                 return ret;
2005
2006         for (i = 0; i < num_vregs; i++) {
2007                 ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
2008                 if (ret)
2009                         return ret;
2010         }
2011
2012         qca->vreg_bulk = bulk;
2013         qca->num_vregs = num_vregs;
2014
2015         return 0;
2016 }
2017
2018 static int qca_serdev_probe(struct serdev_device *serdev)
2019 {
2020         struct qca_serdev *qcadev;
2021         struct hci_dev *hdev;
2022         const struct qca_device_data *data;
2023         int err;
2024         bool power_ctrl_enabled = true;
2025
2026         qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
2027         if (!qcadev)
2028                 return -ENOMEM;
2029
2030         qcadev->serdev_hu.serdev = serdev;
2031         data = device_get_match_data(&serdev->dev);
2032         serdev_device_set_drvdata(serdev, qcadev);
2033         device_property_read_string(&serdev->dev, "firmware-name",
2034                                          &qcadev->firmware_name);
2035         device_property_read_u32(&serdev->dev, "max-speed",
2036                                  &qcadev->oper_speed);
2037         if (!qcadev->oper_speed)
2038                 BT_DBG("UART will pick default operating speed");
2039
2040         if (data &&
2041             (qca_is_wcn399x(data->soc_type) ||
2042             qca_is_wcn6750(data->soc_type))) {
2043                 qcadev->btsoc_type = data->soc_type;
2044                 qcadev->bt_power = devm_kzalloc(&serdev->dev,
2045                                                 sizeof(struct qca_power),
2046                                                 GFP_KERNEL);
2047                 if (!qcadev->bt_power)
2048                         return -ENOMEM;
2049
2050                 qcadev->bt_power->dev = &serdev->dev;
2051                 err = qca_init_regulators(qcadev->bt_power, data->vregs,
2052                                           data->num_vregs);
2053                 if (err) {
2054                         BT_ERR("Failed to init regulators:%d", err);
2055                         return err;
2056                 }
2057
2058                 qcadev->bt_power->vregs_on = false;
2059
2060                 qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
2061                                                GPIOD_OUT_LOW);
2062                 if (IS_ERR_OR_NULL(qcadev->bt_en) && data->soc_type == QCA_WCN6750) {
2063                         dev_err(&serdev->dev, "failed to acquire BT_EN gpio\n");
2064                         power_ctrl_enabled = false;
2065                 }
2066
2067                 qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
2068                                                GPIOD_IN);
2069                 if (IS_ERR_OR_NULL(qcadev->sw_ctrl) && data->soc_type == QCA_WCN6750)
2070                         dev_warn(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
2071
2072                 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
2073                 if (IS_ERR(qcadev->susclk)) {
2074                         dev_err(&serdev->dev, "failed to acquire clk\n");
2075                         return PTR_ERR(qcadev->susclk);
2076                 }
2077
2078                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
2079                 if (err) {
2080                         BT_ERR("wcn3990 serdev registration failed");
2081                         return err;
2082                 }
2083         } else {
2084                 if (data)
2085                         qcadev->btsoc_type = data->soc_type;
2086                 else
2087                         qcadev->btsoc_type = QCA_ROME;
2088
2089                 qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
2090                                                GPIOD_OUT_LOW);
2091                 if (IS_ERR_OR_NULL(qcadev->bt_en)) {
2092                         dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
2093                         power_ctrl_enabled = false;
2094                 }
2095
2096                 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
2097                 if (IS_ERR(qcadev->susclk)) {
2098                         dev_warn(&serdev->dev, "failed to acquire clk\n");
2099                         return PTR_ERR(qcadev->susclk);
2100                 }
2101                 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
2102                 if (err)
2103                         return err;
2104
2105                 err = clk_prepare_enable(qcadev->susclk);
2106                 if (err)
2107                         return err;
2108
2109                 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
2110                 if (err) {
2111                         BT_ERR("Rome serdev registration failed");
2112                         clk_disable_unprepare(qcadev->susclk);
2113                         return err;
2114                 }
2115         }
2116
2117         hdev = qcadev->serdev_hu.hdev;
2118
2119         if (power_ctrl_enabled) {
2120                 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
2121                 hdev->shutdown = qca_power_off;
2122         }
2123
2124         if (data) {
2125                 /* Wideband speech support must be set per driver since it can't
2126                  * be queried via hci. Same with the valid le states quirk.
2127                  */
2128                 if (data->capabilities & QCA_CAP_WIDEBAND_SPEECH)
2129                         set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED,
2130                                 &hdev->quirks);
2131
2132                 if (data->capabilities & QCA_CAP_VALID_LE_STATES)
2133                         set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
2134         }
2135
2136         return 0;
2137 }
2138
2139 static void qca_serdev_remove(struct serdev_device *serdev)
2140 {
2141         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2142         struct qca_power *power = qcadev->bt_power;
2143
2144         if ((qca_is_wcn399x(qcadev->btsoc_type) ||
2145              qca_is_wcn6750(qcadev->btsoc_type)) &&
2146              power->vregs_on)
2147                 qca_power_shutdown(&qcadev->serdev_hu);
2148         else if (qcadev->susclk)
2149                 clk_disable_unprepare(qcadev->susclk);
2150
2151         hci_uart_unregister_device(&qcadev->serdev_hu);
2152 }
2153
2154 static void qca_serdev_shutdown(struct device *dev)
2155 {
2156         int ret;
2157         int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
2158         struct serdev_device *serdev = to_serdev_device(dev);
2159         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2160         const u8 ibs_wake_cmd[] = { 0xFD };
2161         const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 };
2162
2163         if (qcadev->btsoc_type == QCA_QCA6390) {
2164                 serdev_device_write_flush(serdev);
2165                 ret = serdev_device_write_buf(serdev, ibs_wake_cmd,
2166                                               sizeof(ibs_wake_cmd));
2167                 if (ret < 0) {
2168                         BT_ERR("QCA send IBS_WAKE_IND error: %d", ret);
2169                         return;
2170                 }
2171                 serdev_device_wait_until_sent(serdev, timeout);
2172                 usleep_range(8000, 10000);
2173
2174                 serdev_device_write_flush(serdev);
2175                 ret = serdev_device_write_buf(serdev, edl_reset_soc_cmd,
2176                                               sizeof(edl_reset_soc_cmd));
2177                 if (ret < 0) {
2178                         BT_ERR("QCA send EDL_RESET_REQ error: %d", ret);
2179                         return;
2180                 }
2181                 serdev_device_wait_until_sent(serdev, timeout);
2182                 usleep_range(8000, 10000);
2183         }
2184 }
2185
2186 static int __maybe_unused qca_suspend(struct device *dev)
2187 {
2188         struct serdev_device *serdev = to_serdev_device(dev);
2189         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2190         struct hci_uart *hu = &qcadev->serdev_hu;
2191         struct qca_data *qca = hu->priv;
2192         unsigned long flags;
2193         bool tx_pending = false;
2194         int ret = 0;
2195         u8 cmd;
2196         u32 wait_timeout = 0;
2197
2198         set_bit(QCA_SUSPENDING, &qca->flags);
2199
2200         /* if BT SoC is running with default firmware then it does not
2201          * support in-band sleep
2202          */
2203         if (test_bit(QCA_ROM_FW, &qca->flags))
2204                 return 0;
2205
2206         /* During SSR after memory dump collection, controller will be
2207          * powered off and then powered on.If controller is powered off
2208          * during SSR then we should wait until SSR is completed.
2209          */
2210         if (test_bit(QCA_BT_OFF, &qca->flags) &&
2211             !test_bit(QCA_SSR_TRIGGERED, &qca->flags))
2212                 return 0;
2213
2214         if (test_bit(QCA_IBS_DISABLED, &qca->flags) ||
2215             test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
2216                 wait_timeout = test_bit(QCA_SSR_TRIGGERED, &qca->flags) ?
2217                                         IBS_DISABLE_SSR_TIMEOUT_MS :
2218                                         FW_DOWNLOAD_TIMEOUT_MS;
2219
2220                 /* QCA_IBS_DISABLED flag is set to true, During FW download
2221                  * and during memory dump collection. It is reset to false,
2222                  * After FW download complete.
2223                  */
2224                 wait_on_bit_timeout(&qca->flags, QCA_IBS_DISABLED,
2225                             TASK_UNINTERRUPTIBLE, msecs_to_jiffies(wait_timeout));
2226
2227                 if (test_bit(QCA_IBS_DISABLED, &qca->flags)) {
2228                         bt_dev_err(hu->hdev, "SSR or FW download time out");
2229                         ret = -ETIMEDOUT;
2230                         goto error;
2231                 }
2232         }
2233
2234         cancel_work_sync(&qca->ws_awake_device);
2235         cancel_work_sync(&qca->ws_awake_rx);
2236
2237         spin_lock_irqsave_nested(&qca->hci_ibs_lock,
2238                                  flags, SINGLE_DEPTH_NESTING);
2239
2240         switch (qca->tx_ibs_state) {
2241         case HCI_IBS_TX_WAKING:
2242                 del_timer(&qca->wake_retrans_timer);
2243                 fallthrough;
2244         case HCI_IBS_TX_AWAKE:
2245                 del_timer(&qca->tx_idle_timer);
2246
2247                 serdev_device_write_flush(hu->serdev);
2248                 cmd = HCI_IBS_SLEEP_IND;
2249                 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
2250
2251                 if (ret < 0) {
2252                         BT_ERR("Failed to send SLEEP to device");
2253                         break;
2254                 }
2255
2256                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
2257                 qca->ibs_sent_slps++;
2258                 tx_pending = true;
2259                 break;
2260
2261         case HCI_IBS_TX_ASLEEP:
2262                 break;
2263
2264         default:
2265                 BT_ERR("Spurious tx state %d", qca->tx_ibs_state);
2266                 ret = -EINVAL;
2267                 break;
2268         }
2269
2270         spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
2271
2272         if (ret < 0)
2273                 goto error;
2274
2275         if (tx_pending) {
2276                 serdev_device_wait_until_sent(hu->serdev,
2277                                               msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
2278                 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
2279         }
2280
2281         /* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going
2282          * to sleep, so that the packet does not wake the system later.
2283          */
2284         ret = wait_event_interruptible_timeout(qca->suspend_wait_q,
2285                         qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
2286                         msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
2287         if (ret == 0) {
2288                 ret = -ETIMEDOUT;
2289                 goto error;
2290         }
2291
2292         return 0;
2293
2294 error:
2295         clear_bit(QCA_SUSPENDING, &qca->flags);
2296
2297         return ret;
2298 }
2299
2300 static int __maybe_unused qca_resume(struct device *dev)
2301 {
2302         struct serdev_device *serdev = to_serdev_device(dev);
2303         struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
2304         struct hci_uart *hu = &qcadev->serdev_hu;
2305         struct qca_data *qca = hu->priv;
2306
2307         clear_bit(QCA_SUSPENDING, &qca->flags);
2308
2309         return 0;
2310 }
2311
2312 static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume);
2313
2314 #ifdef CONFIG_OF
2315 static const struct of_device_id qca_bluetooth_of_match[] = {
2316         { .compatible = "qcom,qca6174-bt" },
2317         { .compatible = "qcom,qca6390-bt", .data = &qca_soc_data_qca6390},
2318         { .compatible = "qcom,qca9377-bt" },
2319         { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
2320         { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
2321         { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
2322         { .compatible = "qcom,wcn6750-bt", .data = &qca_soc_data_wcn6750},
2323         { /* sentinel */ }
2324 };
2325 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
2326 #endif
2327
2328 #ifdef CONFIG_ACPI
2329 static const struct acpi_device_id qca_bluetooth_acpi_match[] = {
2330         { "QCOM6390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2331         { "DLA16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2332         { "DLB16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2333         { "DLB26390", (kernel_ulong_t)&qca_soc_data_qca6390 },
2334         { },
2335 };
2336 MODULE_DEVICE_TABLE(acpi, qca_bluetooth_acpi_match);
2337 #endif
2338
2339
2340 static struct serdev_device_driver qca_serdev_driver = {
2341         .probe = qca_serdev_probe,
2342         .remove = qca_serdev_remove,
2343         .driver = {
2344                 .name = "hci_uart_qca",
2345                 .of_match_table = of_match_ptr(qca_bluetooth_of_match),
2346                 .acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
2347                 .shutdown = qca_serdev_shutdown,
2348                 .pm = &qca_pm_ops,
2349         },
2350 };
2351
2352 int __init qca_init(void)
2353 {
2354         serdev_device_driver_register(&qca_serdev_driver);
2355
2356         return hci_uart_register_proto(&qca_proto);
2357 }
2358
2359 int __exit qca_deinit(void)
2360 {
2361         serdev_device_driver_unregister(&qca_serdev_driver);
2362
2363         return hci_uart_unregister_proto(&qca_proto);
2364 }