1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Bluetooth Software UART Qualcomm protocol 4 * 5 * HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management 6 * protocol extension to H4. 7 * 8 * Copyright (C) 2007 Texas Instruments, Inc. 9 * Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved. 10 * 11 * Acknowledgements: 12 * This file is based on hci_ll.c, which was... 13 * Written by Ohad Ben-Cohen <ohad@bencohen.org> 14 * which was in turn based on hci_h4.c, which was written 15 * by Maxim Krasnyansky and Marcel Holtmann. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/clk.h> 20 #include <linux/completion.h> 21 #include <linux/debugfs.h> 22 #include <linux/delay.h> 23 #include <linux/devcoredump.h> 24 #include <linux/device.h> 25 #include <linux/gpio/consumer.h> 26 #include <linux/mod_devicetable.h> 27 #include <linux/module.h> 28 #include <linux/of_device.h> 29 #include <linux/acpi.h> 30 #include <linux/platform_device.h> 31 #include <linux/regulator/consumer.h> 32 #include <linux/serdev.h> 33 #include <linux/mutex.h> 34 #include <asm/unaligned.h> 35 36 #include <net/bluetooth/bluetooth.h> 37 #include <net/bluetooth/hci_core.h> 38 39 #include "hci_uart.h" 40 #include "btqca.h" 41 42 /* HCI_IBS protocol messages */ 43 #define HCI_IBS_SLEEP_IND 0xFE 44 #define HCI_IBS_WAKE_IND 0xFD 45 #define HCI_IBS_WAKE_ACK 0xFC 46 #define HCI_MAX_IBS_SIZE 10 47 48 #define IBS_WAKE_RETRANS_TIMEOUT_MS 100 49 #define IBS_BTSOC_TX_IDLE_TIMEOUT_MS 200 50 #define IBS_HOST_TX_IDLE_TIMEOUT_MS 2000 51 #define CMD_TRANS_TIMEOUT_MS 100 52 #define MEMDUMP_TIMEOUT_MS 8000 53 54 /* susclk rate */ 55 #define SUSCLK_RATE_32KHZ 32768 56 57 /* Controller debug log header */ 58 #define QCA_DEBUG_HANDLE 0x2EDC 59 60 /* max retry count when init fails */ 61 #define MAX_INIT_RETRIES 3 62 63 /* Controller dump header */ 64 #define QCA_SSR_DUMP_HANDLE 0x0108 65 #define QCA_DUMP_PACKET_SIZE 255 66 #define QCA_LAST_SEQUENCE_NUM 0xFFFF 67 #define QCA_CRASHBYTE_PACKET_LEN 1096 68 #define QCA_MEMDUMP_BYTE 0xFB 69 70 enum qca_flags { 71 QCA_IBS_ENABLED, 72 QCA_DROP_VENDOR_EVENT, 73 QCA_SUSPENDING, 74 QCA_MEMDUMP_COLLECTION, 75 QCA_HW_ERROR_EVENT, 76 QCA_SSR_TRIGGERED 77 }; 78 79 enum qca_capabilities { 80 QCA_CAP_WIDEBAND_SPEECH = BIT(0), 81 }; 82 83 /* HCI_IBS transmit side sleep protocol states */ 84 enum tx_ibs_states { 85 HCI_IBS_TX_ASLEEP, 86 HCI_IBS_TX_WAKING, 87 HCI_IBS_TX_AWAKE, 88 }; 89 90 /* HCI_IBS receive side sleep protocol states */ 91 enum rx_states { 92 HCI_IBS_RX_ASLEEP, 93 HCI_IBS_RX_AWAKE, 94 }; 95 96 /* HCI_IBS transmit and receive side clock state vote */ 97 enum hci_ibs_clock_state_vote { 98 HCI_IBS_VOTE_STATS_UPDATE, 99 HCI_IBS_TX_VOTE_CLOCK_ON, 100 HCI_IBS_TX_VOTE_CLOCK_OFF, 101 HCI_IBS_RX_VOTE_CLOCK_ON, 102 HCI_IBS_RX_VOTE_CLOCK_OFF, 103 }; 104 105 /* Controller memory dump states */ 106 enum qca_memdump_states { 107 QCA_MEMDUMP_IDLE, 108 QCA_MEMDUMP_COLLECTING, 109 QCA_MEMDUMP_COLLECTED, 110 QCA_MEMDUMP_TIMEOUT, 111 }; 112 113 struct qca_memdump_data { 114 char *memdump_buf_head; 115 char *memdump_buf_tail; 116 u32 current_seq_no; 117 u32 received_dump; 118 u32 ram_dump_size; 119 }; 120 121 struct qca_memdump_event_hdr { 122 __u8 evt; 123 __u8 plen; 124 __u16 opcode; 125 __u16 seq_no; 126 __u8 reserved; 127 } __packed; 128 129 130 struct qca_dump_size { 131 u32 dump_size; 132 } __packed; 133 134 struct qca_data { 135 struct hci_uart *hu; 136 struct sk_buff *rx_skb; 137 struct sk_buff_head txq; 138 struct sk_buff_head tx_wait_q; /* HCI_IBS wait queue */ 139 struct sk_buff_head rx_memdump_q; /* Memdump wait queue */ 140 spinlock_t hci_ibs_lock; /* HCI_IBS state lock */ 141 u8 tx_ibs_state; /* HCI_IBS transmit side power state*/ 142 u8 rx_ibs_state; /* HCI_IBS receive side power state */ 143 bool tx_vote; /* Clock must be on for TX */ 144 bool rx_vote; /* Clock must be on for RX */ 145 struct timer_list tx_idle_timer; 146 u32 tx_idle_delay; 147 struct timer_list wake_retrans_timer; 148 u32 wake_retrans; 149 struct workqueue_struct *workqueue; 150 struct work_struct ws_awake_rx; 151 struct work_struct ws_awake_device; 152 struct work_struct ws_rx_vote_off; 153 struct work_struct ws_tx_vote_off; 154 struct work_struct ctrl_memdump_evt; 155 struct delayed_work ctrl_memdump_timeout; 156 struct qca_memdump_data *qca_memdump; 157 unsigned long flags; 158 struct completion drop_ev_comp; 159 wait_queue_head_t suspend_wait_q; 160 enum qca_memdump_states memdump_state; 161 struct mutex hci_memdump_lock; 162 163 /* For debugging purpose */ 164 u64 ibs_sent_wacks; 165 u64 ibs_sent_slps; 166 u64 ibs_sent_wakes; 167 u64 ibs_recv_wacks; 168 u64 ibs_recv_slps; 169 u64 ibs_recv_wakes; 170 u64 vote_last_jif; 171 u32 vote_on_ms; 172 u32 vote_off_ms; 173 u64 tx_votes_on; 174 u64 rx_votes_on; 175 u64 tx_votes_off; 176 u64 rx_votes_off; 177 u64 votes_on; 178 u64 votes_off; 179 }; 180 181 enum qca_speed_type { 182 QCA_INIT_SPEED = 1, 183 QCA_OPER_SPEED 184 }; 185 186 /* 187 * Voltage regulator information required for configuring the 188 * QCA Bluetooth chipset 189 */ 190 struct qca_vreg { 191 const char *name; 192 unsigned int load_uA; 193 }; 194 195 struct qca_device_data { 196 enum qca_btsoc_type soc_type; 197 struct qca_vreg *vregs; 198 size_t num_vregs; 199 uint32_t capabilities; 200 }; 201 202 /* 203 * Platform data for the QCA Bluetooth power driver. 204 */ 205 struct qca_power { 206 struct device *dev; 207 struct regulator_bulk_data *vreg_bulk; 208 int num_vregs; 209 bool vregs_on; 210 }; 211 212 struct qca_serdev { 213 struct hci_uart serdev_hu; 214 struct gpio_desc *bt_en; 215 struct clk *susclk; 216 enum qca_btsoc_type btsoc_type; 217 struct qca_power *bt_power; 218 u32 init_speed; 219 u32 oper_speed; 220 const char *firmware_name; 221 }; 222 223 static int qca_regulator_enable(struct qca_serdev *qcadev); 224 static void qca_regulator_disable(struct qca_serdev *qcadev); 225 static void qca_power_shutdown(struct hci_uart *hu); 226 static int qca_power_off(struct hci_dev *hdev); 227 static void qca_controller_memdump(struct work_struct *work); 228 qca_soc_type(struct hci_uart * hu)229 static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu) 230 { 231 enum qca_btsoc_type soc_type; 232 233 if (hu->serdev) { 234 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev); 235 236 soc_type = qsd->btsoc_type; 237 } else { 238 soc_type = QCA_ROME; 239 } 240 241 return soc_type; 242 } 243 qca_get_firmware_name(struct hci_uart * hu)244 static const char *qca_get_firmware_name(struct hci_uart *hu) 245 { 246 if (hu->serdev) { 247 struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev); 248 249 return qsd->firmware_name; 250 } else { 251 return NULL; 252 } 253 } 254 __serial_clock_on(struct tty_struct * tty)255 static void __serial_clock_on(struct tty_struct *tty) 256 { 257 /* TODO: Some chipset requires to enable UART clock on client 258 * side to save power consumption or manual work is required. 259 * Please put your code to control UART clock here if needed 260 */ 261 } 262 __serial_clock_off(struct tty_struct * tty)263 static void __serial_clock_off(struct tty_struct *tty) 264 { 265 /* TODO: Some chipset requires to disable UART clock on client 266 * side to save power consumption or manual work is required. 267 * Please put your code to control UART clock off here if needed 268 */ 269 } 270 271 /* serial_clock_vote needs to be called with the ibs lock held */ serial_clock_vote(unsigned long vote,struct hci_uart * hu)272 static void serial_clock_vote(unsigned long vote, struct hci_uart *hu) 273 { 274 struct qca_data *qca = hu->priv; 275 unsigned int diff; 276 277 bool old_vote = (qca->tx_vote | qca->rx_vote); 278 bool new_vote; 279 280 switch (vote) { 281 case HCI_IBS_VOTE_STATS_UPDATE: 282 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif); 283 284 if (old_vote) 285 qca->vote_off_ms += diff; 286 else 287 qca->vote_on_ms += diff; 288 return; 289 290 case HCI_IBS_TX_VOTE_CLOCK_ON: 291 qca->tx_vote = true; 292 qca->tx_votes_on++; 293 break; 294 295 case HCI_IBS_RX_VOTE_CLOCK_ON: 296 qca->rx_vote = true; 297 qca->rx_votes_on++; 298 break; 299 300 case HCI_IBS_TX_VOTE_CLOCK_OFF: 301 qca->tx_vote = false; 302 qca->tx_votes_off++; 303 break; 304 305 case HCI_IBS_RX_VOTE_CLOCK_OFF: 306 qca->rx_vote = false; 307 qca->rx_votes_off++; 308 break; 309 310 default: 311 BT_ERR("Voting irregularity"); 312 return; 313 } 314 315 new_vote = qca->rx_vote | qca->tx_vote; 316 317 if (new_vote != old_vote) { 318 if (new_vote) 319 __serial_clock_on(hu->tty); 320 else 321 __serial_clock_off(hu->tty); 322 323 BT_DBG("Vote serial clock %s(%s)", new_vote ? "true" : "false", 324 vote ? "true" : "false"); 325 326 diff = jiffies_to_msecs(jiffies - qca->vote_last_jif); 327 328 if (new_vote) { 329 qca->votes_on++; 330 qca->vote_off_ms += diff; 331 } else { 332 qca->votes_off++; 333 qca->vote_on_ms += diff; 334 } 335 qca->vote_last_jif = jiffies; 336 } 337 } 338 339 /* Builds and sends an HCI_IBS command packet. 340 * These are very simple packets with only 1 cmd byte. 341 */ send_hci_ibs_cmd(u8 cmd,struct hci_uart * hu)342 static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu) 343 { 344 int err = 0; 345 struct sk_buff *skb = NULL; 346 struct qca_data *qca = hu->priv; 347 348 BT_DBG("hu %p send hci ibs cmd 0x%x", hu, cmd); 349 350 skb = bt_skb_alloc(1, GFP_ATOMIC); 351 if (!skb) { 352 BT_ERR("Failed to allocate memory for HCI_IBS packet"); 353 return -ENOMEM; 354 } 355 356 /* Assign HCI_IBS type */ 357 skb_put_u8(skb, cmd); 358 359 skb_queue_tail(&qca->txq, skb); 360 361 return err; 362 } 363 qca_wq_awake_device(struct work_struct * work)364 static void qca_wq_awake_device(struct work_struct *work) 365 { 366 struct qca_data *qca = container_of(work, struct qca_data, 367 ws_awake_device); 368 struct hci_uart *hu = qca->hu; 369 unsigned long retrans_delay; 370 unsigned long flags; 371 372 BT_DBG("hu %p wq awake device", hu); 373 374 /* Vote for serial clock */ 375 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu); 376 377 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 378 379 /* Send wake indication to device */ 380 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) 381 BT_ERR("Failed to send WAKE to device"); 382 383 qca->ibs_sent_wakes++; 384 385 /* Start retransmit timer */ 386 retrans_delay = msecs_to_jiffies(qca->wake_retrans); 387 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); 388 389 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 390 391 /* Actually send the packets */ 392 hci_uart_tx_wakeup(hu); 393 } 394 qca_wq_awake_rx(struct work_struct * work)395 static void qca_wq_awake_rx(struct work_struct *work) 396 { 397 struct qca_data *qca = container_of(work, struct qca_data, 398 ws_awake_rx); 399 struct hci_uart *hu = qca->hu; 400 unsigned long flags; 401 402 BT_DBG("hu %p wq awake rx", hu); 403 404 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu); 405 406 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 407 qca->rx_ibs_state = HCI_IBS_RX_AWAKE; 408 409 /* Always acknowledge device wake up, 410 * sending IBS message doesn't count as TX ON. 411 */ 412 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) 413 BT_ERR("Failed to acknowledge device wake up"); 414 415 qca->ibs_sent_wacks++; 416 417 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 418 419 /* Actually send the packets */ 420 hci_uart_tx_wakeup(hu); 421 } 422 qca_wq_serial_rx_clock_vote_off(struct work_struct * work)423 static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work) 424 { 425 struct qca_data *qca = container_of(work, struct qca_data, 426 ws_rx_vote_off); 427 struct hci_uart *hu = qca->hu; 428 429 BT_DBG("hu %p rx clock vote off", hu); 430 431 serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu); 432 } 433 qca_wq_serial_tx_clock_vote_off(struct work_struct * work)434 static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work) 435 { 436 struct qca_data *qca = container_of(work, struct qca_data, 437 ws_tx_vote_off); 438 struct hci_uart *hu = qca->hu; 439 440 BT_DBG("hu %p tx clock vote off", hu); 441 442 /* Run HCI tx handling unlocked */ 443 hci_uart_tx_wakeup(hu); 444 445 /* Now that message queued to tty driver, vote for tty clocks off. 446 * It is up to the tty driver to pend the clocks off until tx done. 447 */ 448 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu); 449 } 450 hci_ibs_tx_idle_timeout(struct timer_list * t)451 static void hci_ibs_tx_idle_timeout(struct timer_list *t) 452 { 453 struct qca_data *qca = from_timer(qca, t, tx_idle_timer); 454 struct hci_uart *hu = qca->hu; 455 unsigned long flags; 456 457 BT_DBG("hu %p idle timeout in %d state", hu, qca->tx_ibs_state); 458 459 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 460 flags, SINGLE_DEPTH_NESTING); 461 462 switch (qca->tx_ibs_state) { 463 case HCI_IBS_TX_AWAKE: 464 /* TX_IDLE, go to SLEEP */ 465 if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) { 466 BT_ERR("Failed to send SLEEP to device"); 467 break; 468 } 469 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 470 qca->ibs_sent_slps++; 471 queue_work(qca->workqueue, &qca->ws_tx_vote_off); 472 break; 473 474 case HCI_IBS_TX_ASLEEP: 475 case HCI_IBS_TX_WAKING: 476 default: 477 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state); 478 break; 479 } 480 481 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 482 } 483 hci_ibs_wake_retrans_timeout(struct timer_list * t)484 static void hci_ibs_wake_retrans_timeout(struct timer_list *t) 485 { 486 struct qca_data *qca = from_timer(qca, t, wake_retrans_timer); 487 struct hci_uart *hu = qca->hu; 488 unsigned long flags, retrans_delay; 489 bool retransmit = false; 490 491 BT_DBG("hu %p wake retransmit timeout in %d state", 492 hu, qca->tx_ibs_state); 493 494 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 495 flags, SINGLE_DEPTH_NESTING); 496 497 /* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */ 498 if (test_bit(QCA_SUSPENDING, &qca->flags)) { 499 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 500 return; 501 } 502 503 switch (qca->tx_ibs_state) { 504 case HCI_IBS_TX_WAKING: 505 /* No WAKE_ACK, retransmit WAKE */ 506 retransmit = true; 507 if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) { 508 BT_ERR("Failed to acknowledge device wake up"); 509 break; 510 } 511 qca->ibs_sent_wakes++; 512 retrans_delay = msecs_to_jiffies(qca->wake_retrans); 513 mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); 514 break; 515 516 case HCI_IBS_TX_ASLEEP: 517 case HCI_IBS_TX_AWAKE: 518 default: 519 BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state); 520 break; 521 } 522 523 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 524 525 if (retransmit) 526 hci_uart_tx_wakeup(hu); 527 } 528 529 qca_controller_memdump_timeout(struct work_struct * work)530 static void qca_controller_memdump_timeout(struct work_struct *work) 531 { 532 struct qca_data *qca = container_of(work, struct qca_data, 533 ctrl_memdump_timeout.work); 534 struct hci_uart *hu = qca->hu; 535 536 mutex_lock(&qca->hci_memdump_lock); 537 if (test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) { 538 qca->memdump_state = QCA_MEMDUMP_TIMEOUT; 539 if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) { 540 /* Inject hw error event to reset the device 541 * and driver. 542 */ 543 hci_reset_dev(hu->hdev); 544 } 545 } 546 547 mutex_unlock(&qca->hci_memdump_lock); 548 } 549 550 551 /* Initialize protocol */ qca_open(struct hci_uart * hu)552 static int qca_open(struct hci_uart *hu) 553 { 554 struct qca_serdev *qcadev; 555 struct qca_data *qca; 556 557 BT_DBG("hu %p qca_open", hu); 558 559 if (!hci_uart_has_flow_control(hu)) 560 return -EOPNOTSUPP; 561 562 qca = kzalloc(sizeof(struct qca_data), GFP_KERNEL); 563 if (!qca) 564 return -ENOMEM; 565 566 skb_queue_head_init(&qca->txq); 567 skb_queue_head_init(&qca->tx_wait_q); 568 skb_queue_head_init(&qca->rx_memdump_q); 569 spin_lock_init(&qca->hci_ibs_lock); 570 mutex_init(&qca->hci_memdump_lock); 571 qca->workqueue = alloc_ordered_workqueue("qca_wq", 0); 572 if (!qca->workqueue) { 573 BT_ERR("QCA Workqueue not initialized properly"); 574 kfree(qca); 575 return -ENOMEM; 576 } 577 578 INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx); 579 INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device); 580 INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off); 581 INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off); 582 INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump); 583 INIT_DELAYED_WORK(&qca->ctrl_memdump_timeout, 584 qca_controller_memdump_timeout); 585 init_waitqueue_head(&qca->suspend_wait_q); 586 587 qca->hu = hu; 588 init_completion(&qca->drop_ev_comp); 589 590 /* Assume we start with both sides asleep -- extra wakes OK */ 591 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 592 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; 593 594 qca->vote_last_jif = jiffies; 595 596 hu->priv = qca; 597 598 if (hu->serdev) { 599 qcadev = serdev_device_get_drvdata(hu->serdev); 600 601 if (qca_is_wcn399x(qcadev->btsoc_type)) 602 hu->init_speed = qcadev->init_speed; 603 604 if (qcadev->oper_speed) 605 hu->oper_speed = qcadev->oper_speed; 606 } 607 608 timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0); 609 qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS; 610 611 timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0); 612 qca->tx_idle_delay = IBS_HOST_TX_IDLE_TIMEOUT_MS; 613 614 BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u", 615 qca->tx_idle_delay, qca->wake_retrans); 616 617 return 0; 618 } 619 qca_debugfs_init(struct hci_dev * hdev)620 static void qca_debugfs_init(struct hci_dev *hdev) 621 { 622 struct hci_uart *hu = hci_get_drvdata(hdev); 623 struct qca_data *qca = hu->priv; 624 struct dentry *ibs_dir; 625 umode_t mode; 626 627 if (!hdev->debugfs) 628 return; 629 630 ibs_dir = debugfs_create_dir("ibs", hdev->debugfs); 631 632 /* read only */ 633 mode = S_IRUGO; 634 debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state); 635 debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state); 636 debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir, 637 &qca->ibs_sent_slps); 638 debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir, 639 &qca->ibs_sent_wakes); 640 debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir, 641 &qca->ibs_sent_wacks); 642 debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir, 643 &qca->ibs_recv_slps); 644 debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir, 645 &qca->ibs_recv_wakes); 646 debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir, 647 &qca->ibs_recv_wacks); 648 debugfs_create_bool("tx_vote", mode, ibs_dir, &qca->tx_vote); 649 debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on); 650 debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off); 651 debugfs_create_bool("rx_vote", mode, ibs_dir, &qca->rx_vote); 652 debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on); 653 debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off); 654 debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on); 655 debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off); 656 debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms); 657 debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms); 658 659 /* read/write */ 660 mode = S_IRUGO | S_IWUSR; 661 debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans); 662 debugfs_create_u32("tx_idle_delay", mode, ibs_dir, 663 &qca->tx_idle_delay); 664 } 665 666 /* Flush protocol data */ qca_flush(struct hci_uart * hu)667 static int qca_flush(struct hci_uart *hu) 668 { 669 struct qca_data *qca = hu->priv; 670 671 BT_DBG("hu %p qca flush", hu); 672 673 skb_queue_purge(&qca->tx_wait_q); 674 skb_queue_purge(&qca->txq); 675 676 return 0; 677 } 678 679 /* Close protocol */ qca_close(struct hci_uart * hu)680 static int qca_close(struct hci_uart *hu) 681 { 682 struct qca_data *qca = hu->priv; 683 684 BT_DBG("hu %p qca close", hu); 685 686 serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu); 687 688 skb_queue_purge(&qca->tx_wait_q); 689 skb_queue_purge(&qca->txq); 690 skb_queue_purge(&qca->rx_memdump_q); 691 del_timer(&qca->tx_idle_timer); 692 del_timer(&qca->wake_retrans_timer); 693 destroy_workqueue(qca->workqueue); 694 qca->hu = NULL; 695 696 kfree_skb(qca->rx_skb); 697 698 hu->priv = NULL; 699 700 kfree(qca); 701 702 return 0; 703 } 704 705 /* Called upon a wake-up-indication from the device. 706 */ device_want_to_wakeup(struct hci_uart * hu)707 static void device_want_to_wakeup(struct hci_uart *hu) 708 { 709 unsigned long flags; 710 struct qca_data *qca = hu->priv; 711 712 BT_DBG("hu %p want to wake up", hu); 713 714 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 715 716 qca->ibs_recv_wakes++; 717 718 /* Don't wake the rx up when suspending. */ 719 if (test_bit(QCA_SUSPENDING, &qca->flags)) { 720 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 721 return; 722 } 723 724 switch (qca->rx_ibs_state) { 725 case HCI_IBS_RX_ASLEEP: 726 /* Make sure clock is on - we may have turned clock off since 727 * receiving the wake up indicator awake rx clock. 728 */ 729 queue_work(qca->workqueue, &qca->ws_awake_rx); 730 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 731 return; 732 733 case HCI_IBS_RX_AWAKE: 734 /* Always acknowledge device wake up, 735 * sending IBS message doesn't count as TX ON. 736 */ 737 if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) { 738 BT_ERR("Failed to acknowledge device wake up"); 739 break; 740 } 741 qca->ibs_sent_wacks++; 742 break; 743 744 default: 745 /* Any other state is illegal */ 746 BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d", 747 qca->rx_ibs_state); 748 break; 749 } 750 751 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 752 753 /* Actually send the packets */ 754 hci_uart_tx_wakeup(hu); 755 } 756 757 /* Called upon a sleep-indication from the device. 758 */ device_want_to_sleep(struct hci_uart * hu)759 static void device_want_to_sleep(struct hci_uart *hu) 760 { 761 unsigned long flags; 762 struct qca_data *qca = hu->priv; 763 764 BT_DBG("hu %p want to sleep in %d state", hu, qca->rx_ibs_state); 765 766 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 767 768 qca->ibs_recv_slps++; 769 770 switch (qca->rx_ibs_state) { 771 case HCI_IBS_RX_AWAKE: 772 /* Update state */ 773 qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; 774 /* Vote off rx clock under workqueue */ 775 queue_work(qca->workqueue, &qca->ws_rx_vote_off); 776 break; 777 778 case HCI_IBS_RX_ASLEEP: 779 break; 780 781 default: 782 /* Any other state is illegal */ 783 BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d", 784 qca->rx_ibs_state); 785 break; 786 } 787 788 wake_up_interruptible(&qca->suspend_wait_q); 789 790 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 791 } 792 793 /* Called upon wake-up-acknowledgement from the device 794 */ device_woke_up(struct hci_uart * hu)795 static void device_woke_up(struct hci_uart *hu) 796 { 797 unsigned long flags, idle_delay; 798 struct qca_data *qca = hu->priv; 799 struct sk_buff *skb = NULL; 800 801 BT_DBG("hu %p woke up", hu); 802 803 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 804 805 qca->ibs_recv_wacks++; 806 807 /* Don't react to the wake-up-acknowledgment when suspending. */ 808 if (test_bit(QCA_SUSPENDING, &qca->flags)) { 809 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 810 return; 811 } 812 813 switch (qca->tx_ibs_state) { 814 case HCI_IBS_TX_AWAKE: 815 /* Expect one if we send 2 WAKEs */ 816 BT_DBG("Received HCI_IBS_WAKE_ACK in tx state %d", 817 qca->tx_ibs_state); 818 break; 819 820 case HCI_IBS_TX_WAKING: 821 /* Send pending packets */ 822 while ((skb = skb_dequeue(&qca->tx_wait_q))) 823 skb_queue_tail(&qca->txq, skb); 824 825 /* Switch timers and change state to HCI_IBS_TX_AWAKE */ 826 del_timer(&qca->wake_retrans_timer); 827 idle_delay = msecs_to_jiffies(qca->tx_idle_delay); 828 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); 829 qca->tx_ibs_state = HCI_IBS_TX_AWAKE; 830 break; 831 832 case HCI_IBS_TX_ASLEEP: 833 default: 834 BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d", 835 qca->tx_ibs_state); 836 break; 837 } 838 839 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 840 841 /* Actually send the packets */ 842 hci_uart_tx_wakeup(hu); 843 } 844 845 /* Enqueue frame for transmittion (padding, crc, etc) may be called from 846 * two simultaneous tasklets. 847 */ qca_enqueue(struct hci_uart * hu,struct sk_buff * skb)848 static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb) 849 { 850 unsigned long flags = 0, idle_delay; 851 struct qca_data *qca = hu->priv; 852 853 BT_DBG("hu %p qca enq skb %p tx_ibs_state %d", hu, skb, 854 qca->tx_ibs_state); 855 856 if (test_bit(QCA_SSR_TRIGGERED, &qca->flags)) { 857 /* As SSR is in progress, ignore the packets */ 858 bt_dev_dbg(hu->hdev, "SSR is in progress"); 859 kfree_skb(skb); 860 return 0; 861 } 862 863 /* Prepend skb with frame type */ 864 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 865 866 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 867 868 /* Don't go to sleep in middle of patch download or 869 * Out-Of-Band(GPIOs control) sleep is selected. 870 * Don't wake the device up when suspending. 871 */ 872 if (!test_bit(QCA_IBS_ENABLED, &qca->flags) || 873 test_bit(QCA_SUSPENDING, &qca->flags)) { 874 skb_queue_tail(&qca->txq, skb); 875 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 876 return 0; 877 } 878 879 /* Act according to current state */ 880 switch (qca->tx_ibs_state) { 881 case HCI_IBS_TX_AWAKE: 882 BT_DBG("Device awake, sending normally"); 883 skb_queue_tail(&qca->txq, skb); 884 idle_delay = msecs_to_jiffies(qca->tx_idle_delay); 885 mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); 886 break; 887 888 case HCI_IBS_TX_ASLEEP: 889 BT_DBG("Device asleep, waking up and queueing packet"); 890 /* Save packet for later */ 891 skb_queue_tail(&qca->tx_wait_q, skb); 892 893 qca->tx_ibs_state = HCI_IBS_TX_WAKING; 894 /* Schedule a work queue to wake up device */ 895 queue_work(qca->workqueue, &qca->ws_awake_device); 896 break; 897 898 case HCI_IBS_TX_WAKING: 899 BT_DBG("Device waking up, queueing packet"); 900 /* Transient state; just keep packet for later */ 901 skb_queue_tail(&qca->tx_wait_q, skb); 902 break; 903 904 default: 905 BT_ERR("Illegal tx state: %d (losing packet)", 906 qca->tx_ibs_state); 907 kfree_skb(skb); 908 break; 909 } 910 911 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 912 913 return 0; 914 } 915 qca_ibs_sleep_ind(struct hci_dev * hdev,struct sk_buff * skb)916 static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb) 917 { 918 struct hci_uart *hu = hci_get_drvdata(hdev); 919 920 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND); 921 922 device_want_to_sleep(hu); 923 924 kfree_skb(skb); 925 return 0; 926 } 927 qca_ibs_wake_ind(struct hci_dev * hdev,struct sk_buff * skb)928 static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb) 929 { 930 struct hci_uart *hu = hci_get_drvdata(hdev); 931 932 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND); 933 934 device_want_to_wakeup(hu); 935 936 kfree_skb(skb); 937 return 0; 938 } 939 qca_ibs_wake_ack(struct hci_dev * hdev,struct sk_buff * skb)940 static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb) 941 { 942 struct hci_uart *hu = hci_get_drvdata(hdev); 943 944 BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK); 945 946 device_woke_up(hu); 947 948 kfree_skb(skb); 949 return 0; 950 } 951 qca_recv_acl_data(struct hci_dev * hdev,struct sk_buff * skb)952 static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb) 953 { 954 /* We receive debug logs from chip as an ACL packets. 955 * Instead of sending the data to ACL to decode the 956 * received data, we are pushing them to the above layers 957 * as a diagnostic packet. 958 */ 959 if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE) 960 return hci_recv_diag(hdev, skb); 961 962 return hci_recv_frame(hdev, skb); 963 } 964 qca_controller_memdump(struct work_struct * work)965 static void qca_controller_memdump(struct work_struct *work) 966 { 967 struct qca_data *qca = container_of(work, struct qca_data, 968 ctrl_memdump_evt); 969 struct hci_uart *hu = qca->hu; 970 struct sk_buff *skb; 971 struct qca_memdump_event_hdr *cmd_hdr; 972 struct qca_memdump_data *qca_memdump = qca->qca_memdump; 973 struct qca_dump_size *dump; 974 char *memdump_buf; 975 char nullBuff[QCA_DUMP_PACKET_SIZE] = { 0 }; 976 u16 seq_no; 977 u32 dump_size; 978 u32 rx_size; 979 enum qca_btsoc_type soc_type = qca_soc_type(hu); 980 981 while ((skb = skb_dequeue(&qca->rx_memdump_q))) { 982 983 mutex_lock(&qca->hci_memdump_lock); 984 /* Skip processing the received packets if timeout detected 985 * or memdump collection completed. 986 */ 987 if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT || 988 qca->memdump_state == QCA_MEMDUMP_COLLECTED) { 989 mutex_unlock(&qca->hci_memdump_lock); 990 return; 991 } 992 993 if (!qca_memdump) { 994 qca_memdump = kzalloc(sizeof(struct qca_memdump_data), 995 GFP_ATOMIC); 996 if (!qca_memdump) { 997 mutex_unlock(&qca->hci_memdump_lock); 998 return; 999 } 1000 1001 qca->qca_memdump = qca_memdump; 1002 } 1003 1004 qca->memdump_state = QCA_MEMDUMP_COLLECTING; 1005 cmd_hdr = (void *) skb->data; 1006 seq_no = __le16_to_cpu(cmd_hdr->seq_no); 1007 skb_pull(skb, sizeof(struct qca_memdump_event_hdr)); 1008 1009 if (!seq_no) { 1010 1011 /* This is the first frame of memdump packet from 1012 * the controller, Disable IBS to recevie dump 1013 * with out any interruption, ideally time required for 1014 * the controller to send the dump is 8 seconds. let us 1015 * start timer to handle this asynchronous activity. 1016 */ 1017 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1018 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags); 1019 dump = (void *) skb->data; 1020 dump_size = __le32_to_cpu(dump->dump_size); 1021 if (!(dump_size)) { 1022 bt_dev_err(hu->hdev, "Rx invalid memdump size"); 1023 kfree_skb(skb); 1024 mutex_unlock(&qca->hci_memdump_lock); 1025 return; 1026 } 1027 1028 bt_dev_info(hu->hdev, "QCA collecting dump of size:%u", 1029 dump_size); 1030 queue_delayed_work(qca->workqueue, 1031 &qca->ctrl_memdump_timeout, 1032 msecs_to_jiffies(MEMDUMP_TIMEOUT_MS) 1033 ); 1034 1035 skb_pull(skb, sizeof(dump_size)); 1036 memdump_buf = vmalloc(dump_size); 1037 qca_memdump->ram_dump_size = dump_size; 1038 qca_memdump->memdump_buf_head = memdump_buf; 1039 qca_memdump->memdump_buf_tail = memdump_buf; 1040 } 1041 1042 memdump_buf = qca_memdump->memdump_buf_tail; 1043 1044 /* If sequence no 0 is missed then there is no point in 1045 * accepting the other sequences. 1046 */ 1047 if (!memdump_buf) { 1048 bt_dev_err(hu->hdev, "QCA: Discarding other packets"); 1049 kfree(qca_memdump); 1050 kfree_skb(skb); 1051 qca->qca_memdump = NULL; 1052 mutex_unlock(&qca->hci_memdump_lock); 1053 return; 1054 } 1055 1056 /* There could be chance of missing some packets from 1057 * the controller. In such cases let us store the dummy 1058 * packets in the buffer. 1059 */ 1060 /* For QCA6390, controller does not lost packets but 1061 * sequence number field of packat sometimes has error 1062 * bits, so skip this checking for missing packet. 1063 */ 1064 while ((seq_no > qca_memdump->current_seq_no + 1) && 1065 (soc_type != QCA_QCA6390) && 1066 seq_no != QCA_LAST_SEQUENCE_NUM) { 1067 bt_dev_err(hu->hdev, "QCA controller missed packet:%d", 1068 qca_memdump->current_seq_no); 1069 rx_size = qca_memdump->received_dump; 1070 rx_size += QCA_DUMP_PACKET_SIZE; 1071 if (rx_size > qca_memdump->ram_dump_size) { 1072 bt_dev_err(hu->hdev, 1073 "QCA memdump received %d, no space for missed packet", 1074 qca_memdump->received_dump); 1075 break; 1076 } 1077 memcpy(memdump_buf, nullBuff, QCA_DUMP_PACKET_SIZE); 1078 memdump_buf = memdump_buf + QCA_DUMP_PACKET_SIZE; 1079 qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE; 1080 qca_memdump->current_seq_no++; 1081 } 1082 1083 rx_size = qca_memdump->received_dump + skb->len; 1084 if (rx_size <= qca_memdump->ram_dump_size) { 1085 if ((seq_no != QCA_LAST_SEQUENCE_NUM) && 1086 (seq_no != qca_memdump->current_seq_no)) 1087 bt_dev_err(hu->hdev, 1088 "QCA memdump unexpected packet %d", 1089 seq_no); 1090 bt_dev_dbg(hu->hdev, 1091 "QCA memdump packet %d with length %d", 1092 seq_no, skb->len); 1093 memcpy(memdump_buf, (unsigned char *)skb->data, 1094 skb->len); 1095 memdump_buf = memdump_buf + skb->len; 1096 qca_memdump->memdump_buf_tail = memdump_buf; 1097 qca_memdump->current_seq_no = seq_no + 1; 1098 qca_memdump->received_dump += skb->len; 1099 } else { 1100 bt_dev_err(hu->hdev, 1101 "QCA memdump received %d, no space for packet %d", 1102 qca_memdump->received_dump, seq_no); 1103 } 1104 qca->qca_memdump = qca_memdump; 1105 kfree_skb(skb); 1106 if (seq_no == QCA_LAST_SEQUENCE_NUM) { 1107 bt_dev_info(hu->hdev, 1108 "QCA memdump Done, received %d, total %d", 1109 qca_memdump->received_dump, 1110 qca_memdump->ram_dump_size); 1111 memdump_buf = qca_memdump->memdump_buf_head; 1112 dev_coredumpv(&hu->serdev->dev, memdump_buf, 1113 qca_memdump->received_dump, GFP_KERNEL); 1114 cancel_delayed_work(&qca->ctrl_memdump_timeout); 1115 kfree(qca->qca_memdump); 1116 qca->qca_memdump = NULL; 1117 qca->memdump_state = QCA_MEMDUMP_COLLECTED; 1118 clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags); 1119 } 1120 1121 mutex_unlock(&qca->hci_memdump_lock); 1122 } 1123 1124 } 1125 qca_controller_memdump_event(struct hci_dev * hdev,struct sk_buff * skb)1126 static int qca_controller_memdump_event(struct hci_dev *hdev, 1127 struct sk_buff *skb) 1128 { 1129 struct hci_uart *hu = hci_get_drvdata(hdev); 1130 struct qca_data *qca = hu->priv; 1131 1132 set_bit(QCA_SSR_TRIGGERED, &qca->flags); 1133 skb_queue_tail(&qca->rx_memdump_q, skb); 1134 queue_work(qca->workqueue, &qca->ctrl_memdump_evt); 1135 1136 return 0; 1137 } 1138 qca_recv_event(struct hci_dev * hdev,struct sk_buff * skb)1139 static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb) 1140 { 1141 struct hci_uart *hu = hci_get_drvdata(hdev); 1142 struct qca_data *qca = hu->priv; 1143 1144 if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) { 1145 struct hci_event_hdr *hdr = (void *)skb->data; 1146 1147 /* For the WCN3990 the vendor command for a baudrate change 1148 * isn't sent as synchronous HCI command, because the 1149 * controller sends the corresponding vendor event with the 1150 * new baudrate. The event is received and properly decoded 1151 * after changing the baudrate of the host port. It needs to 1152 * be dropped, otherwise it can be misinterpreted as 1153 * response to a later firmware download command (also a 1154 * vendor command). 1155 */ 1156 1157 if (hdr->evt == HCI_EV_VENDOR) 1158 complete(&qca->drop_ev_comp); 1159 1160 kfree_skb(skb); 1161 1162 return 0; 1163 } 1164 /* We receive chip memory dump as an event packet, With a dedicated 1165 * handler followed by a hardware error event. When this event is 1166 * received we store dump into a file before closing hci. This 1167 * dump will help in triaging the issues. 1168 */ 1169 if ((skb->data[0] == HCI_VENDOR_PKT) && 1170 (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE)) 1171 return qca_controller_memdump_event(hdev, skb); 1172 1173 return hci_recv_frame(hdev, skb); 1174 } 1175 1176 #define QCA_IBS_SLEEP_IND_EVENT \ 1177 .type = HCI_IBS_SLEEP_IND, \ 1178 .hlen = 0, \ 1179 .loff = 0, \ 1180 .lsize = 0, \ 1181 .maxlen = HCI_MAX_IBS_SIZE 1182 1183 #define QCA_IBS_WAKE_IND_EVENT \ 1184 .type = HCI_IBS_WAKE_IND, \ 1185 .hlen = 0, \ 1186 .loff = 0, \ 1187 .lsize = 0, \ 1188 .maxlen = HCI_MAX_IBS_SIZE 1189 1190 #define QCA_IBS_WAKE_ACK_EVENT \ 1191 .type = HCI_IBS_WAKE_ACK, \ 1192 .hlen = 0, \ 1193 .loff = 0, \ 1194 .lsize = 0, \ 1195 .maxlen = HCI_MAX_IBS_SIZE 1196 1197 static const struct h4_recv_pkt qca_recv_pkts[] = { 1198 { H4_RECV_ACL, .recv = qca_recv_acl_data }, 1199 { H4_RECV_SCO, .recv = hci_recv_frame }, 1200 { H4_RECV_EVENT, .recv = qca_recv_event }, 1201 { QCA_IBS_WAKE_IND_EVENT, .recv = qca_ibs_wake_ind }, 1202 { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_wake_ack }, 1203 { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind }, 1204 }; 1205 qca_recv(struct hci_uart * hu,const void * data,int count)1206 static int qca_recv(struct hci_uart *hu, const void *data, int count) 1207 { 1208 struct qca_data *qca = hu->priv; 1209 1210 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 1211 return -EUNATCH; 1212 1213 qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count, 1214 qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts)); 1215 if (IS_ERR(qca->rx_skb)) { 1216 int err = PTR_ERR(qca->rx_skb); 1217 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 1218 qca->rx_skb = NULL; 1219 return err; 1220 } 1221 1222 return count; 1223 } 1224 qca_dequeue(struct hci_uart * hu)1225 static struct sk_buff *qca_dequeue(struct hci_uart *hu) 1226 { 1227 struct qca_data *qca = hu->priv; 1228 1229 return skb_dequeue(&qca->txq); 1230 } 1231 qca_get_baudrate_value(int speed)1232 static uint8_t qca_get_baudrate_value(int speed) 1233 { 1234 switch (speed) { 1235 case 9600: 1236 return QCA_BAUDRATE_9600; 1237 case 19200: 1238 return QCA_BAUDRATE_19200; 1239 case 38400: 1240 return QCA_BAUDRATE_38400; 1241 case 57600: 1242 return QCA_BAUDRATE_57600; 1243 case 115200: 1244 return QCA_BAUDRATE_115200; 1245 case 230400: 1246 return QCA_BAUDRATE_230400; 1247 case 460800: 1248 return QCA_BAUDRATE_460800; 1249 case 500000: 1250 return QCA_BAUDRATE_500000; 1251 case 921600: 1252 return QCA_BAUDRATE_921600; 1253 case 1000000: 1254 return QCA_BAUDRATE_1000000; 1255 case 2000000: 1256 return QCA_BAUDRATE_2000000; 1257 case 3000000: 1258 return QCA_BAUDRATE_3000000; 1259 case 3200000: 1260 return QCA_BAUDRATE_3200000; 1261 case 3500000: 1262 return QCA_BAUDRATE_3500000; 1263 default: 1264 return QCA_BAUDRATE_115200; 1265 } 1266 } 1267 qca_set_baudrate(struct hci_dev * hdev,uint8_t baudrate)1268 static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) 1269 { 1270 struct hci_uart *hu = hci_get_drvdata(hdev); 1271 struct qca_data *qca = hu->priv; 1272 struct sk_buff *skb; 1273 u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 }; 1274 1275 if (baudrate > QCA_BAUDRATE_3200000) 1276 return -EINVAL; 1277 1278 cmd[4] = baudrate; 1279 1280 skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL); 1281 if (!skb) { 1282 bt_dev_err(hdev, "Failed to allocate baudrate packet"); 1283 return -ENOMEM; 1284 } 1285 1286 /* Assign commands to change baudrate and packet type. */ 1287 skb_put_data(skb, cmd, sizeof(cmd)); 1288 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT; 1289 1290 skb_queue_tail(&qca->txq, skb); 1291 hci_uart_tx_wakeup(hu); 1292 1293 /* Wait for the baudrate change request to be sent */ 1294 1295 while (!skb_queue_empty(&qca->txq)) 1296 usleep_range(100, 200); 1297 1298 if (hu->serdev) 1299 serdev_device_wait_until_sent(hu->serdev, 1300 msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS)); 1301 1302 /* Give the controller time to process the request */ 1303 if (qca_is_wcn399x(qca_soc_type(hu))) 1304 msleep(10); 1305 else 1306 msleep(300); 1307 1308 return 0; 1309 } 1310 host_set_baudrate(struct hci_uart * hu,unsigned int speed)1311 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) 1312 { 1313 if (hu->serdev) 1314 serdev_device_set_baudrate(hu->serdev, speed); 1315 else 1316 hci_uart_set_baudrate(hu, speed); 1317 } 1318 qca_send_power_pulse(struct hci_uart * hu,bool on)1319 static int qca_send_power_pulse(struct hci_uart *hu, bool on) 1320 { 1321 int ret; 1322 int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS); 1323 u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE; 1324 1325 /* These power pulses are single byte command which are sent 1326 * at required baudrate to wcn3990. On wcn3990, we have an external 1327 * circuit at Tx pin which decodes the pulse sent at specific baudrate. 1328 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT 1329 * and also we use the same power inputs to turn on and off for 1330 * Wi-Fi/BT. Powering up the power sources will not enable BT, until 1331 * we send a power on pulse at 115200 bps. This algorithm will help to 1332 * save power. Disabling hardware flow control is mandatory while 1333 * sending power pulses to SoC. 1334 */ 1335 bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd); 1336 1337 serdev_device_write_flush(hu->serdev); 1338 hci_uart_set_flow_control(hu, true); 1339 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd)); 1340 if (ret < 0) { 1341 bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd); 1342 return ret; 1343 } 1344 1345 serdev_device_wait_until_sent(hu->serdev, timeout); 1346 hci_uart_set_flow_control(hu, false); 1347 1348 /* Give to controller time to boot/shutdown */ 1349 if (on) 1350 msleep(100); 1351 else 1352 msleep(10); 1353 1354 return 0; 1355 } 1356 qca_get_speed(struct hci_uart * hu,enum qca_speed_type speed_type)1357 static unsigned int qca_get_speed(struct hci_uart *hu, 1358 enum qca_speed_type speed_type) 1359 { 1360 unsigned int speed = 0; 1361 1362 if (speed_type == QCA_INIT_SPEED) { 1363 if (hu->init_speed) 1364 speed = hu->init_speed; 1365 else if (hu->proto->init_speed) 1366 speed = hu->proto->init_speed; 1367 } else { 1368 if (hu->oper_speed) 1369 speed = hu->oper_speed; 1370 else if (hu->proto->oper_speed) 1371 speed = hu->proto->oper_speed; 1372 } 1373 1374 return speed; 1375 } 1376 qca_check_speeds(struct hci_uart * hu)1377 static int qca_check_speeds(struct hci_uart *hu) 1378 { 1379 if (qca_is_wcn399x(qca_soc_type(hu))) { 1380 if (!qca_get_speed(hu, QCA_INIT_SPEED) && 1381 !qca_get_speed(hu, QCA_OPER_SPEED)) 1382 return -EINVAL; 1383 } else { 1384 if (!qca_get_speed(hu, QCA_INIT_SPEED) || 1385 !qca_get_speed(hu, QCA_OPER_SPEED)) 1386 return -EINVAL; 1387 } 1388 1389 return 0; 1390 } 1391 qca_set_speed(struct hci_uart * hu,enum qca_speed_type speed_type)1392 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type) 1393 { 1394 unsigned int speed, qca_baudrate; 1395 struct qca_data *qca = hu->priv; 1396 int ret = 0; 1397 1398 if (speed_type == QCA_INIT_SPEED) { 1399 speed = qca_get_speed(hu, QCA_INIT_SPEED); 1400 if (speed) 1401 host_set_baudrate(hu, speed); 1402 } else { 1403 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1404 1405 speed = qca_get_speed(hu, QCA_OPER_SPEED); 1406 if (!speed) 1407 return 0; 1408 1409 /* Disable flow control for wcn3990 to deassert RTS while 1410 * changing the baudrate of chip and host. 1411 */ 1412 if (qca_is_wcn399x(soc_type)) 1413 hci_uart_set_flow_control(hu, true); 1414 1415 if (soc_type == QCA_WCN3990) { 1416 reinit_completion(&qca->drop_ev_comp); 1417 set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags); 1418 } 1419 1420 qca_baudrate = qca_get_baudrate_value(speed); 1421 bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed); 1422 ret = qca_set_baudrate(hu->hdev, qca_baudrate); 1423 if (ret) 1424 goto error; 1425 1426 host_set_baudrate(hu, speed); 1427 1428 error: 1429 if (qca_is_wcn399x(soc_type)) 1430 hci_uart_set_flow_control(hu, false); 1431 1432 if (soc_type == QCA_WCN3990) { 1433 /* Wait for the controller to send the vendor event 1434 * for the baudrate change command. 1435 */ 1436 if (!wait_for_completion_timeout(&qca->drop_ev_comp, 1437 msecs_to_jiffies(100))) { 1438 bt_dev_err(hu->hdev, 1439 "Failed to change controller baudrate\n"); 1440 ret = -ETIMEDOUT; 1441 } 1442 1443 clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags); 1444 } 1445 } 1446 1447 return ret; 1448 } 1449 qca_send_crashbuffer(struct hci_uart * hu)1450 static int qca_send_crashbuffer(struct hci_uart *hu) 1451 { 1452 struct qca_data *qca = hu->priv; 1453 struct sk_buff *skb; 1454 1455 skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL); 1456 if (!skb) { 1457 bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet"); 1458 return -ENOMEM; 1459 } 1460 1461 /* We forcefully crash the controller, by sending 0xfb byte for 1462 * 1024 times. We also might have chance of losing data, To be 1463 * on safer side we send 1096 bytes to the SoC. 1464 */ 1465 memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE, 1466 QCA_CRASHBYTE_PACKET_LEN); 1467 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT; 1468 bt_dev_info(hu->hdev, "crash the soc to collect controller dump"); 1469 skb_queue_tail(&qca->txq, skb); 1470 hci_uart_tx_wakeup(hu); 1471 1472 return 0; 1473 } 1474 qca_wait_for_dump_collection(struct hci_dev * hdev)1475 static void qca_wait_for_dump_collection(struct hci_dev *hdev) 1476 { 1477 struct hci_uart *hu = hci_get_drvdata(hdev); 1478 struct qca_data *qca = hu->priv; 1479 1480 wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION, 1481 TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS); 1482 1483 clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags); 1484 } 1485 qca_hw_error(struct hci_dev * hdev,u8 code)1486 static void qca_hw_error(struct hci_dev *hdev, u8 code) 1487 { 1488 struct hci_uart *hu = hci_get_drvdata(hdev); 1489 struct qca_data *qca = hu->priv; 1490 1491 set_bit(QCA_SSR_TRIGGERED, &qca->flags); 1492 set_bit(QCA_HW_ERROR_EVENT, &qca->flags); 1493 bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state); 1494 1495 if (qca->memdump_state == QCA_MEMDUMP_IDLE) { 1496 /* If hardware error event received for other than QCA 1497 * soc memory dump event, then we need to crash the SOC 1498 * and wait here for 8 seconds to get the dump packets. 1499 * This will block main thread to be on hold until we 1500 * collect dump. 1501 */ 1502 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags); 1503 qca_send_crashbuffer(hu); 1504 qca_wait_for_dump_collection(hdev); 1505 } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) { 1506 /* Let us wait here until memory dump collected or 1507 * memory dump timer expired. 1508 */ 1509 bt_dev_info(hdev, "waiting for dump to complete"); 1510 qca_wait_for_dump_collection(hdev); 1511 } 1512 1513 mutex_lock(&qca->hci_memdump_lock); 1514 if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) { 1515 bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout"); 1516 if (qca->qca_memdump) { 1517 vfree(qca->qca_memdump->memdump_buf_head); 1518 kfree(qca->qca_memdump); 1519 qca->qca_memdump = NULL; 1520 } 1521 qca->memdump_state = QCA_MEMDUMP_TIMEOUT; 1522 cancel_delayed_work(&qca->ctrl_memdump_timeout); 1523 } 1524 mutex_unlock(&qca->hci_memdump_lock); 1525 1526 if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT || 1527 qca->memdump_state == QCA_MEMDUMP_COLLECTED) { 1528 cancel_work_sync(&qca->ctrl_memdump_evt); 1529 skb_queue_purge(&qca->rx_memdump_q); 1530 } 1531 1532 clear_bit(QCA_HW_ERROR_EVENT, &qca->flags); 1533 } 1534 qca_cmd_timeout(struct hci_dev * hdev)1535 static void qca_cmd_timeout(struct hci_dev *hdev) 1536 { 1537 struct hci_uart *hu = hci_get_drvdata(hdev); 1538 struct qca_data *qca = hu->priv; 1539 1540 set_bit(QCA_SSR_TRIGGERED, &qca->flags); 1541 if (qca->memdump_state == QCA_MEMDUMP_IDLE) { 1542 set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags); 1543 qca_send_crashbuffer(hu); 1544 qca_wait_for_dump_collection(hdev); 1545 } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) { 1546 /* Let us wait here until memory dump collected or 1547 * memory dump timer expired. 1548 */ 1549 bt_dev_info(hdev, "waiting for dump to complete"); 1550 qca_wait_for_dump_collection(hdev); 1551 } 1552 1553 mutex_lock(&qca->hci_memdump_lock); 1554 if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) { 1555 qca->memdump_state = QCA_MEMDUMP_TIMEOUT; 1556 if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) { 1557 /* Inject hw error event to reset the device 1558 * and driver. 1559 */ 1560 hci_reset_dev(hu->hdev); 1561 } 1562 } 1563 mutex_unlock(&qca->hci_memdump_lock); 1564 } 1565 qca_wcn3990_init(struct hci_uart * hu)1566 static int qca_wcn3990_init(struct hci_uart *hu) 1567 { 1568 struct qca_serdev *qcadev; 1569 int ret; 1570 1571 /* Check for vregs status, may be hci down has turned 1572 * off the voltage regulator. 1573 */ 1574 qcadev = serdev_device_get_drvdata(hu->serdev); 1575 if (!qcadev->bt_power->vregs_on) { 1576 serdev_device_close(hu->serdev); 1577 ret = qca_regulator_enable(qcadev); 1578 if (ret) 1579 return ret; 1580 1581 ret = serdev_device_open(hu->serdev); 1582 if (ret) { 1583 bt_dev_err(hu->hdev, "failed to open port"); 1584 return ret; 1585 } 1586 } 1587 1588 /* Forcefully enable wcn3990 to enter in to boot mode. */ 1589 host_set_baudrate(hu, 2400); 1590 ret = qca_send_power_pulse(hu, false); 1591 if (ret) 1592 return ret; 1593 1594 qca_set_speed(hu, QCA_INIT_SPEED); 1595 ret = qca_send_power_pulse(hu, true); 1596 if (ret) 1597 return ret; 1598 1599 /* Now the device is in ready state to communicate with host. 1600 * To sync host with device we need to reopen port. 1601 * Without this, we will have RTS and CTS synchronization 1602 * issues. 1603 */ 1604 serdev_device_close(hu->serdev); 1605 ret = serdev_device_open(hu->serdev); 1606 if (ret) { 1607 bt_dev_err(hu->hdev, "failed to open port"); 1608 return ret; 1609 } 1610 1611 hci_uart_set_flow_control(hu, false); 1612 1613 return 0; 1614 } 1615 qca_power_on(struct hci_dev * hdev)1616 static int qca_power_on(struct hci_dev *hdev) 1617 { 1618 struct hci_uart *hu = hci_get_drvdata(hdev); 1619 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1620 struct qca_serdev *qcadev; 1621 int ret = 0; 1622 1623 /* Non-serdev device usually is powered by external power 1624 * and don't need additional action in driver for power on 1625 */ 1626 if (!hu->serdev) 1627 return 0; 1628 1629 if (qca_is_wcn399x(soc_type)) { 1630 ret = qca_wcn3990_init(hu); 1631 } else { 1632 qcadev = serdev_device_get_drvdata(hu->serdev); 1633 if (qcadev->bt_en) { 1634 gpiod_set_value_cansleep(qcadev->bt_en, 1); 1635 /* Controller needs time to bootup. */ 1636 msleep(150); 1637 } 1638 } 1639 1640 return ret; 1641 } 1642 qca_setup(struct hci_uart * hu)1643 static int qca_setup(struct hci_uart *hu) 1644 { 1645 struct hci_dev *hdev = hu->hdev; 1646 struct qca_data *qca = hu->priv; 1647 unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200; 1648 unsigned int retries = 0; 1649 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1650 const char *firmware_name = qca_get_firmware_name(hu); 1651 int ret; 1652 int soc_ver = 0; 1653 1654 ret = qca_check_speeds(hu); 1655 if (ret) 1656 return ret; 1657 1658 /* Patch downloading has to be done without IBS mode */ 1659 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1660 1661 /* Enable controller to do both LE scan and BR/EDR inquiry 1662 * simultaneously. 1663 */ 1664 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); 1665 1666 bt_dev_info(hdev, "setting up %s", 1667 qca_is_wcn399x(soc_type) ? "wcn399x" : "ROME/QCA6390"); 1668 1669 qca->memdump_state = QCA_MEMDUMP_IDLE; 1670 1671 retry: 1672 ret = qca_power_on(hdev); 1673 if (ret) 1674 return ret; 1675 1676 clear_bit(QCA_SSR_TRIGGERED, &qca->flags); 1677 1678 if (qca_is_wcn399x(soc_type)) { 1679 set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks); 1680 1681 ret = qca_read_soc_version(hdev, &soc_ver, soc_type); 1682 if (ret) 1683 return ret; 1684 } else { 1685 qca_set_speed(hu, QCA_INIT_SPEED); 1686 } 1687 1688 /* Setup user speed if needed */ 1689 speed = qca_get_speed(hu, QCA_OPER_SPEED); 1690 if (speed) { 1691 ret = qca_set_speed(hu, QCA_OPER_SPEED); 1692 if (ret) 1693 return ret; 1694 1695 qca_baudrate = qca_get_baudrate_value(speed); 1696 } 1697 1698 if (!qca_is_wcn399x(soc_type)) { 1699 /* Get QCA version information */ 1700 ret = qca_read_soc_version(hdev, &soc_ver, soc_type); 1701 if (ret) 1702 return ret; 1703 } 1704 1705 bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver); 1706 /* Setup patch / NVM configurations */ 1707 ret = qca_uart_setup(hdev, qca_baudrate, soc_type, soc_ver, 1708 firmware_name); 1709 if (!ret) { 1710 set_bit(QCA_IBS_ENABLED, &qca->flags); 1711 qca_debugfs_init(hdev); 1712 hu->hdev->hw_error = qca_hw_error; 1713 hu->hdev->cmd_timeout = qca_cmd_timeout; 1714 } else if (ret == -ENOENT) { 1715 /* No patch/nvm-config found, run with original fw/config */ 1716 ret = 0; 1717 } else if (ret == -EAGAIN) { 1718 /* 1719 * Userspace firmware loader will return -EAGAIN in case no 1720 * patch/nvm-config is found, so run with original fw/config. 1721 */ 1722 ret = 0; 1723 } else { 1724 if (retries < MAX_INIT_RETRIES) { 1725 qca_power_shutdown(hu); 1726 if (hu->serdev) { 1727 serdev_device_close(hu->serdev); 1728 ret = serdev_device_open(hu->serdev); 1729 if (ret) { 1730 bt_dev_err(hdev, "failed to open port"); 1731 return ret; 1732 } 1733 } 1734 retries++; 1735 goto retry; 1736 } 1737 } 1738 1739 /* Setup bdaddr */ 1740 if (soc_type == QCA_ROME) 1741 hu->hdev->set_bdaddr = qca_set_bdaddr_rome; 1742 else 1743 hu->hdev->set_bdaddr = qca_set_bdaddr; 1744 1745 return ret; 1746 } 1747 1748 static const struct hci_uart_proto qca_proto = { 1749 .id = HCI_UART_QCA, 1750 .name = "QCA", 1751 .manufacturer = 29, 1752 .init_speed = 115200, 1753 .oper_speed = 3000000, 1754 .open = qca_open, 1755 .close = qca_close, 1756 .flush = qca_flush, 1757 .setup = qca_setup, 1758 .recv = qca_recv, 1759 .enqueue = qca_enqueue, 1760 .dequeue = qca_dequeue, 1761 }; 1762 1763 static const struct qca_device_data qca_soc_data_wcn3990 = { 1764 .soc_type = QCA_WCN3990, 1765 .vregs = (struct qca_vreg []) { 1766 { "vddio", 15000 }, 1767 { "vddxo", 80000 }, 1768 { "vddrf", 300000 }, 1769 { "vddch0", 450000 }, 1770 }, 1771 .num_vregs = 4, 1772 }; 1773 1774 static const struct qca_device_data qca_soc_data_wcn3991 = { 1775 .soc_type = QCA_WCN3991, 1776 .vregs = (struct qca_vreg []) { 1777 { "vddio", 15000 }, 1778 { "vddxo", 80000 }, 1779 { "vddrf", 300000 }, 1780 { "vddch0", 450000 }, 1781 }, 1782 .num_vregs = 4, 1783 .capabilities = QCA_CAP_WIDEBAND_SPEECH, 1784 }; 1785 1786 static const struct qca_device_data qca_soc_data_wcn3998 = { 1787 .soc_type = QCA_WCN3998, 1788 .vregs = (struct qca_vreg []) { 1789 { "vddio", 10000 }, 1790 { "vddxo", 80000 }, 1791 { "vddrf", 300000 }, 1792 { "vddch0", 450000 }, 1793 }, 1794 .num_vregs = 4, 1795 }; 1796 1797 static const struct qca_device_data qca_soc_data_qca6390 = { 1798 .soc_type = QCA_QCA6390, 1799 .num_vregs = 0, 1800 }; 1801 qca_power_shutdown(struct hci_uart * hu)1802 static void qca_power_shutdown(struct hci_uart *hu) 1803 { 1804 struct qca_serdev *qcadev; 1805 struct qca_data *qca = hu->priv; 1806 unsigned long flags; 1807 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1808 1809 qcadev = serdev_device_get_drvdata(hu->serdev); 1810 1811 /* From this point we go into power off state. But serial port is 1812 * still open, stop queueing the IBS data and flush all the buffered 1813 * data in skb's. 1814 */ 1815 spin_lock_irqsave(&qca->hci_ibs_lock, flags); 1816 clear_bit(QCA_IBS_ENABLED, &qca->flags); 1817 qca_flush(hu); 1818 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 1819 1820 /* Non-serdev device usually is powered by external power 1821 * and don't need additional action in driver for power down 1822 */ 1823 if (!hu->serdev) 1824 return; 1825 1826 if (qca_is_wcn399x(soc_type)) { 1827 host_set_baudrate(hu, 2400); 1828 qca_send_power_pulse(hu, false); 1829 qca_regulator_disable(qcadev); 1830 } else if (qcadev->bt_en) { 1831 gpiod_set_value_cansleep(qcadev->bt_en, 0); 1832 } 1833 } 1834 qca_power_off(struct hci_dev * hdev)1835 static int qca_power_off(struct hci_dev *hdev) 1836 { 1837 struct hci_uart *hu = hci_get_drvdata(hdev); 1838 struct qca_data *qca = hu->priv; 1839 enum qca_btsoc_type soc_type = qca_soc_type(hu); 1840 1841 hu->hdev->hw_error = NULL; 1842 hu->hdev->cmd_timeout = NULL; 1843 1844 /* Stop sending shutdown command if soc crashes. */ 1845 if (soc_type != QCA_ROME 1846 && qca->memdump_state == QCA_MEMDUMP_IDLE) { 1847 qca_send_pre_shutdown_cmd(hdev); 1848 usleep_range(8000, 10000); 1849 } 1850 1851 qca_power_shutdown(hu); 1852 return 0; 1853 } 1854 qca_regulator_enable(struct qca_serdev * qcadev)1855 static int qca_regulator_enable(struct qca_serdev *qcadev) 1856 { 1857 struct qca_power *power = qcadev->bt_power; 1858 int ret; 1859 1860 /* Already enabled */ 1861 if (power->vregs_on) 1862 return 0; 1863 1864 BT_DBG("enabling %d regulators)", power->num_vregs); 1865 1866 ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk); 1867 if (ret) 1868 return ret; 1869 1870 power->vregs_on = true; 1871 1872 ret = clk_prepare_enable(qcadev->susclk); 1873 if (ret) 1874 qca_regulator_disable(qcadev); 1875 1876 return ret; 1877 } 1878 qca_regulator_disable(struct qca_serdev * qcadev)1879 static void qca_regulator_disable(struct qca_serdev *qcadev) 1880 { 1881 struct qca_power *power; 1882 1883 if (!qcadev) 1884 return; 1885 1886 power = qcadev->bt_power; 1887 1888 /* Already disabled? */ 1889 if (!power->vregs_on) 1890 return; 1891 1892 regulator_bulk_disable(power->num_vregs, power->vreg_bulk); 1893 power->vregs_on = false; 1894 1895 clk_disable_unprepare(qcadev->susclk); 1896 } 1897 qca_init_regulators(struct qca_power * qca,const struct qca_vreg * vregs,size_t num_vregs)1898 static int qca_init_regulators(struct qca_power *qca, 1899 const struct qca_vreg *vregs, size_t num_vregs) 1900 { 1901 struct regulator_bulk_data *bulk; 1902 int ret; 1903 int i; 1904 1905 bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL); 1906 if (!bulk) 1907 return -ENOMEM; 1908 1909 for (i = 0; i < num_vregs; i++) 1910 bulk[i].supply = vregs[i].name; 1911 1912 ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk); 1913 if (ret < 0) 1914 return ret; 1915 1916 for (i = 0; i < num_vregs; i++) { 1917 ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA); 1918 if (ret) 1919 return ret; 1920 } 1921 1922 qca->vreg_bulk = bulk; 1923 qca->num_vregs = num_vregs; 1924 1925 return 0; 1926 } 1927 qca_serdev_probe(struct serdev_device * serdev)1928 static int qca_serdev_probe(struct serdev_device *serdev) 1929 { 1930 struct qca_serdev *qcadev; 1931 struct hci_dev *hdev; 1932 const struct qca_device_data *data; 1933 int err; 1934 bool power_ctrl_enabled = true; 1935 1936 qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL); 1937 if (!qcadev) 1938 return -ENOMEM; 1939 1940 qcadev->serdev_hu.serdev = serdev; 1941 data = device_get_match_data(&serdev->dev); 1942 serdev_device_set_drvdata(serdev, qcadev); 1943 device_property_read_string(&serdev->dev, "firmware-name", 1944 &qcadev->firmware_name); 1945 device_property_read_u32(&serdev->dev, "max-speed", 1946 &qcadev->oper_speed); 1947 if (!qcadev->oper_speed) 1948 BT_DBG("UART will pick default operating speed"); 1949 1950 if (data && qca_is_wcn399x(data->soc_type)) { 1951 qcadev->btsoc_type = data->soc_type; 1952 qcadev->bt_power = devm_kzalloc(&serdev->dev, 1953 sizeof(struct qca_power), 1954 GFP_KERNEL); 1955 if (!qcadev->bt_power) 1956 return -ENOMEM; 1957 1958 qcadev->bt_power->dev = &serdev->dev; 1959 err = qca_init_regulators(qcadev->bt_power, data->vregs, 1960 data->num_vregs); 1961 if (err) { 1962 BT_ERR("Failed to init regulators:%d", err); 1963 return err; 1964 } 1965 1966 qcadev->bt_power->vregs_on = false; 1967 1968 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL); 1969 if (IS_ERR(qcadev->susclk)) { 1970 dev_err(&serdev->dev, "failed to acquire clk\n"); 1971 return PTR_ERR(qcadev->susclk); 1972 } 1973 1974 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); 1975 if (err) { 1976 BT_ERR("wcn3990 serdev registration failed"); 1977 return err; 1978 } 1979 } else { 1980 if (data) 1981 qcadev->btsoc_type = data->soc_type; 1982 else 1983 qcadev->btsoc_type = QCA_ROME; 1984 1985 qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable", 1986 GPIOD_OUT_LOW); 1987 if (!qcadev->bt_en) { 1988 dev_warn(&serdev->dev, "failed to acquire enable gpio\n"); 1989 power_ctrl_enabled = false; 1990 } 1991 1992 qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL); 1993 if (IS_ERR(qcadev->susclk)) { 1994 dev_warn(&serdev->dev, "failed to acquire clk\n"); 1995 return PTR_ERR(qcadev->susclk); 1996 } 1997 err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ); 1998 if (err) 1999 return err; 2000 2001 err = clk_prepare_enable(qcadev->susclk); 2002 if (err) 2003 return err; 2004 2005 err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto); 2006 if (err) { 2007 BT_ERR("Rome serdev registration failed"); 2008 clk_disable_unprepare(qcadev->susclk); 2009 return err; 2010 } 2011 } 2012 2013 hdev = qcadev->serdev_hu.hdev; 2014 2015 if (power_ctrl_enabled) { 2016 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); 2017 hdev->shutdown = qca_power_off; 2018 } 2019 2020 /* Wideband speech support must be set per driver since it can't be 2021 * queried via hci. 2022 */ 2023 if (data && (data->capabilities & QCA_CAP_WIDEBAND_SPEECH)) 2024 set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks); 2025 2026 return 0; 2027 } 2028 qca_serdev_remove(struct serdev_device * serdev)2029 static void qca_serdev_remove(struct serdev_device *serdev) 2030 { 2031 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); 2032 struct qca_power *power = qcadev->bt_power; 2033 2034 if (qca_is_wcn399x(qcadev->btsoc_type) && power->vregs_on) 2035 qca_power_shutdown(&qcadev->serdev_hu); 2036 else if (qcadev->susclk) 2037 clk_disable_unprepare(qcadev->susclk); 2038 2039 hci_uart_unregister_device(&qcadev->serdev_hu); 2040 } 2041 qca_serdev_shutdown(struct device * dev)2042 static void qca_serdev_shutdown(struct device *dev) 2043 { 2044 int ret; 2045 int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS); 2046 struct serdev_device *serdev = to_serdev_device(dev); 2047 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); 2048 const u8 ibs_wake_cmd[] = { 0xFD }; 2049 const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 }; 2050 2051 if (qcadev->btsoc_type == QCA_QCA6390) { 2052 serdev_device_write_flush(serdev); 2053 ret = serdev_device_write_buf(serdev, ibs_wake_cmd, 2054 sizeof(ibs_wake_cmd)); 2055 if (ret < 0) { 2056 BT_ERR("QCA send IBS_WAKE_IND error: %d", ret); 2057 return; 2058 } 2059 serdev_device_wait_until_sent(serdev, timeout); 2060 usleep_range(8000, 10000); 2061 2062 serdev_device_write_flush(serdev); 2063 ret = serdev_device_write_buf(serdev, edl_reset_soc_cmd, 2064 sizeof(edl_reset_soc_cmd)); 2065 if (ret < 0) { 2066 BT_ERR("QCA send EDL_RESET_REQ error: %d", ret); 2067 return; 2068 } 2069 serdev_device_wait_until_sent(serdev, timeout); 2070 usleep_range(8000, 10000); 2071 } 2072 } 2073 qca_suspend(struct device * dev)2074 static int __maybe_unused qca_suspend(struct device *dev) 2075 { 2076 struct serdev_device *serdev = to_serdev_device(dev); 2077 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); 2078 struct hci_uart *hu = &qcadev->serdev_hu; 2079 struct qca_data *qca = hu->priv; 2080 unsigned long flags; 2081 bool tx_pending = false; 2082 int ret = 0; 2083 u8 cmd; 2084 2085 set_bit(QCA_SUSPENDING, &qca->flags); 2086 2087 /* Device is downloading patch or doesn't support in-band sleep. */ 2088 if (!test_bit(QCA_IBS_ENABLED, &qca->flags)) 2089 return 0; 2090 2091 cancel_work_sync(&qca->ws_awake_device); 2092 cancel_work_sync(&qca->ws_awake_rx); 2093 2094 spin_lock_irqsave_nested(&qca->hci_ibs_lock, 2095 flags, SINGLE_DEPTH_NESTING); 2096 2097 switch (qca->tx_ibs_state) { 2098 case HCI_IBS_TX_WAKING: 2099 del_timer(&qca->wake_retrans_timer); 2100 fallthrough; 2101 case HCI_IBS_TX_AWAKE: 2102 del_timer(&qca->tx_idle_timer); 2103 2104 serdev_device_write_flush(hu->serdev); 2105 cmd = HCI_IBS_SLEEP_IND; 2106 ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd)); 2107 2108 if (ret < 0) { 2109 BT_ERR("Failed to send SLEEP to device"); 2110 break; 2111 } 2112 2113 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; 2114 qca->ibs_sent_slps++; 2115 tx_pending = true; 2116 break; 2117 2118 case HCI_IBS_TX_ASLEEP: 2119 break; 2120 2121 default: 2122 BT_ERR("Spurious tx state %d", qca->tx_ibs_state); 2123 ret = -EINVAL; 2124 break; 2125 } 2126 2127 spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); 2128 2129 if (ret < 0) 2130 goto error; 2131 2132 if (tx_pending) { 2133 serdev_device_wait_until_sent(hu->serdev, 2134 msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS)); 2135 serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu); 2136 } 2137 2138 /* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going 2139 * to sleep, so that the packet does not wake the system later. 2140 */ 2141 ret = wait_event_interruptible_timeout(qca->suspend_wait_q, 2142 qca->rx_ibs_state == HCI_IBS_RX_ASLEEP, 2143 msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS)); 2144 if (ret == 0) { 2145 ret = -ETIMEDOUT; 2146 goto error; 2147 } 2148 2149 return 0; 2150 2151 error: 2152 clear_bit(QCA_SUSPENDING, &qca->flags); 2153 2154 return ret; 2155 } 2156 qca_resume(struct device * dev)2157 static int __maybe_unused qca_resume(struct device *dev) 2158 { 2159 struct serdev_device *serdev = to_serdev_device(dev); 2160 struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); 2161 struct hci_uart *hu = &qcadev->serdev_hu; 2162 struct qca_data *qca = hu->priv; 2163 2164 clear_bit(QCA_SUSPENDING, &qca->flags); 2165 2166 return 0; 2167 } 2168 2169 static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume); 2170 2171 #ifdef CONFIG_OF 2172 static const struct of_device_id qca_bluetooth_of_match[] = { 2173 { .compatible = "qcom,qca6174-bt" }, 2174 { .compatible = "qcom,qca6390-bt", .data = &qca_soc_data_qca6390}, 2175 { .compatible = "qcom,qca9377-bt" }, 2176 { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990}, 2177 { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991}, 2178 { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998}, 2179 { /* sentinel */ } 2180 }; 2181 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match); 2182 #endif 2183 2184 #ifdef CONFIG_ACPI 2185 static const struct acpi_device_id qca_bluetooth_acpi_match[] = { 2186 { "QCOM6390", (kernel_ulong_t)&qca_soc_data_qca6390 }, 2187 { "DLA16390", (kernel_ulong_t)&qca_soc_data_qca6390 }, 2188 { "DLB16390", (kernel_ulong_t)&qca_soc_data_qca6390 }, 2189 { "DLB26390", (kernel_ulong_t)&qca_soc_data_qca6390 }, 2190 { }, 2191 }; 2192 MODULE_DEVICE_TABLE(acpi, qca_bluetooth_acpi_match); 2193 #endif 2194 2195 2196 static struct serdev_device_driver qca_serdev_driver = { 2197 .probe = qca_serdev_probe, 2198 .remove = qca_serdev_remove, 2199 .driver = { 2200 .name = "hci_uart_qca", 2201 .of_match_table = of_match_ptr(qca_bluetooth_of_match), 2202 .acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match), 2203 .shutdown = qca_serdev_shutdown, 2204 .pm = &qca_pm_ops, 2205 }, 2206 }; 2207 qca_init(void)2208 int __init qca_init(void) 2209 { 2210 serdev_device_driver_register(&qca_serdev_driver); 2211 2212 return hci_uart_register_proto(&qca_proto); 2213 } 2214 qca_deinit(void)2215 int __exit qca_deinit(void) 2216 { 2217 serdev_device_driver_unregister(&qca_serdev_driver); 2218 2219 return hci_uart_unregister_proto(&qca_proto); 2220 } 2221
