1// SPDX-License-Identifier: GPL-2.0 2// Copyright (c) 2018 MediaTek Inc. 3 4/* 5 * Bluetooth support for MediaTek serial devices 6 * 7 * Author: Sean Wang <sean.wang@mediatek.com> 8 * 9 */ 10 11#include <asm/unaligned.h> 12#include <linux/atomic.h> 13#include <linux/clk.h> 14#include <linux/firmware.h> 15#include <linux/gpio/consumer.h> 16#include <linux/iopoll.h> 17#include <linux/kernel.h> 18#include <linux/module.h> 19#include <linux/of.h> 20#include <linux/pinctrl/consumer.h> 21#include <linux/pm_runtime.h> 22#include <linux/regulator/consumer.h> 23#include <linux/serdev.h> 24#include <linux/skbuff.h> 25 26#include <net/bluetooth/bluetooth.h> 27#include <net/bluetooth/hci_core.h> 28 29#include "h4_recv.h" 30#include "btmtk.h" 31 32#define VERSION "0.2" 33 34#define MTK_STP_TLR_SIZE 2 35 36#define BTMTKUART_TX_STATE_ACTIVE 1 37#define BTMTKUART_TX_STATE_WAKEUP 2 38#define BTMTKUART_TX_WAIT_VND_EVT 3 39#define BTMTKUART_REQUIRED_WAKEUP 4 40 41#define BTMTKUART_FLAG_STANDALONE_HW BIT(0) 42 43struct mtk_stp_hdr { 44 u8 prefix; 45 __be16 dlen; 46 u8 cs; 47} __packed; 48 49struct btmtkuart_data { 50 unsigned int flags; 51 const char *fwname; 52}; 53 54struct btmtkuart_dev { 55 struct hci_dev *hdev; 56 struct serdev_device *serdev; 57 58 struct clk *clk; 59 struct clk *osc; 60 struct regulator *vcc; 61 struct gpio_desc *reset; 62 struct gpio_desc *boot; 63 struct pinctrl *pinctrl; 64 struct pinctrl_state *pins_runtime; 65 struct pinctrl_state *pins_boot; 66 speed_t desired_speed; 67 speed_t curr_speed; 68 69 struct work_struct tx_work; 70 unsigned long tx_state; 71 struct sk_buff_head txq; 72 73 struct sk_buff *rx_skb; 74 struct sk_buff *evt_skb; 75 76 u8 stp_pad[6]; 77 u8 stp_cursor; 78 u16 stp_dlen; 79 80 const struct btmtkuart_data *data; 81}; 82 83#define btmtkuart_is_standalone(bdev) \ 84 ((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW) 85#define btmtkuart_is_builtin_soc(bdev) \ 86 !((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW) 87 88static int mtk_hci_wmt_sync(struct hci_dev *hdev, 89 struct btmtk_hci_wmt_params *wmt_params) 90{ 91 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 92 struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc; 93 u32 hlen, status = BTMTK_WMT_INVALID; 94 struct btmtk_hci_wmt_evt *wmt_evt; 95 struct btmtk_hci_wmt_cmd *wc; 96 struct btmtk_wmt_hdr *hdr; 97 int err; 98 99 /* Send the WMT command and wait until the WMT event returns */ 100 hlen = sizeof(*hdr) + wmt_params->dlen; 101 if (hlen > 255) { 102 err = -EINVAL; 103 goto err_free_skb; 104 } 105 106 wc = kzalloc(hlen, GFP_KERNEL); 107 if (!wc) { 108 err = -ENOMEM; 109 goto err_free_skb; 110 } 111 112 hdr = &wc->hdr; 113 hdr->dir = 1; 114 hdr->op = wmt_params->op; 115 hdr->dlen = cpu_to_le16(wmt_params->dlen + 1); 116 hdr->flag = wmt_params->flag; 117 memcpy(wc->data, wmt_params->data, wmt_params->dlen); 118 119 set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 120 121 err = __hci_cmd_send(hdev, 0xfc6f, hlen, wc); 122 if (err < 0) { 123 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 124 goto err_free_wc; 125 } 126 127 /* The vendor specific WMT commands are all answered by a vendor 128 * specific event and will not have the Command Status or Command 129 * Complete as with usual HCI command flow control. 130 * 131 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT 132 * state to be cleared. The driver specific event receive routine 133 * will clear that state and with that indicate completion of the 134 * WMT command. 135 */ 136 err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT, 137 TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT); 138 if (err == -EINTR) { 139 bt_dev_err(hdev, "Execution of wmt command interrupted"); 140 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 141 goto err_free_wc; 142 } 143 144 if (err) { 145 bt_dev_err(hdev, "Execution of wmt command timed out"); 146 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 147 err = -ETIMEDOUT; 148 goto err_free_wc; 149 } 150 151 /* Parse and handle the return WMT event */ 152 wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data; 153 if (wmt_evt->whdr.op != hdr->op) { 154 bt_dev_err(hdev, "Wrong op received %d expected %d", 155 wmt_evt->whdr.op, hdr->op); 156 err = -EIO; 157 goto err_free_wc; 158 } 159 160 switch (wmt_evt->whdr.op) { 161 case BTMTK_WMT_SEMAPHORE: 162 if (wmt_evt->whdr.flag == 2) 163 status = BTMTK_WMT_PATCH_UNDONE; 164 else 165 status = BTMTK_WMT_PATCH_DONE; 166 break; 167 case BTMTK_WMT_FUNC_CTRL: 168 wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt; 169 if (be16_to_cpu(wmt_evt_funcc->status) == 0x404) 170 status = BTMTK_WMT_ON_DONE; 171 else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420) 172 status = BTMTK_WMT_ON_PROGRESS; 173 else 174 status = BTMTK_WMT_ON_UNDONE; 175 break; 176 } 177 178 if (wmt_params->status) 179 *wmt_params->status = status; 180 181err_free_wc: 182 kfree(wc); 183err_free_skb: 184 kfree_skb(bdev->evt_skb); 185 bdev->evt_skb = NULL; 186 187 return err; 188} 189 190static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb) 191{ 192 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 193 struct hci_event_hdr *hdr = (void *)skb->data; 194 int err; 195 196 /* When someone waits for the WMT event, the skb is being cloned 197 * and being processed the events from there then. 198 */ 199 if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) { 200 bdev->evt_skb = skb_clone(skb, GFP_KERNEL); 201 if (!bdev->evt_skb) { 202 err = -ENOMEM; 203 goto err_out; 204 } 205 } 206 207 err = hci_recv_frame(hdev, skb); 208 if (err < 0) 209 goto err_free_skb; 210 211 if (hdr->evt == HCI_EV_WMT) { 212 if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT, 213 &bdev->tx_state)) { 214 /* Barrier to sync with other CPUs */ 215 smp_mb__after_atomic(); 216 wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT); 217 } 218 } 219 220 return 0; 221 222err_free_skb: 223 kfree_skb(bdev->evt_skb); 224 bdev->evt_skb = NULL; 225 226err_out: 227 return err; 228} 229 230static const struct h4_recv_pkt mtk_recv_pkts[] = { 231 { H4_RECV_ACL, .recv = hci_recv_frame }, 232 { H4_RECV_SCO, .recv = hci_recv_frame }, 233 { H4_RECV_EVENT, .recv = btmtkuart_recv_event }, 234}; 235 236static void btmtkuart_tx_work(struct work_struct *work) 237{ 238 struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev, 239 tx_work); 240 struct serdev_device *serdev = bdev->serdev; 241 struct hci_dev *hdev = bdev->hdev; 242 243 while (1) { 244 clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state); 245 246 while (1) { 247 struct sk_buff *skb = skb_dequeue(&bdev->txq); 248 int len; 249 250 if (!skb) 251 break; 252 253 len = serdev_device_write_buf(serdev, skb->data, 254 skb->len); 255 hdev->stat.byte_tx += len; 256 257 skb_pull(skb, len); 258 if (skb->len > 0) { 259 skb_queue_head(&bdev->txq, skb); 260 break; 261 } 262 263 switch (hci_skb_pkt_type(skb)) { 264 case HCI_COMMAND_PKT: 265 hdev->stat.cmd_tx++; 266 break; 267 case HCI_ACLDATA_PKT: 268 hdev->stat.acl_tx++; 269 break; 270 case HCI_SCODATA_PKT: 271 hdev->stat.sco_tx++; 272 break; 273 } 274 275 kfree_skb(skb); 276 } 277 278 if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state)) 279 break; 280 } 281 282 clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state); 283} 284 285static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev) 286{ 287 if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state)) 288 set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state); 289 290 schedule_work(&bdev->tx_work); 291} 292 293static const unsigned char * 294mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count, 295 int *sz_h4) 296{ 297 struct mtk_stp_hdr *shdr; 298 299 /* The cursor is reset when all the data of STP is consumed out */ 300 if (!bdev->stp_dlen && bdev->stp_cursor >= 6) 301 bdev->stp_cursor = 0; 302 303 /* Filling pad until all STP info is obtained */ 304 while (bdev->stp_cursor < 6 && count > 0) { 305 bdev->stp_pad[bdev->stp_cursor] = *data; 306 bdev->stp_cursor++; 307 data++; 308 count--; 309 } 310 311 /* Retrieve STP info and have a sanity check */ 312 if (!bdev->stp_dlen && bdev->stp_cursor >= 6) { 313 shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2]; 314 bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff; 315 316 /* Resync STP when unexpected data is being read */ 317 if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) { 318 bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)", 319 shdr->prefix, bdev->stp_dlen); 320 bdev->stp_cursor = 2; 321 bdev->stp_dlen = 0; 322 } 323 } 324 325 /* Directly quit when there's no data found for H4 can process */ 326 if (count <= 0) 327 return NULL; 328 329 /* Tranlate to how much the size of data H4 can handle so far */ 330 *sz_h4 = min_t(int, count, bdev->stp_dlen); 331 332 /* Update the remaining size of STP packet */ 333 bdev->stp_dlen -= *sz_h4; 334 335 /* Data points to STP payload which can be handled by H4 */ 336 return data; 337} 338 339static void btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count) 340{ 341 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 342 const unsigned char *p_left = data, *p_h4; 343 int sz_left = count, sz_h4, adv; 344 int err; 345 346 while (sz_left > 0) { 347 /* The serial data received from MT7622 BT controller is 348 * at all time padded around with the STP header and tailer. 349 * 350 * A full STP packet is looking like 351 * ----------------------------------- 352 * | STP header | H:4 | STP tailer | 353 * ----------------------------------- 354 * but it doesn't guarantee to contain a full H:4 packet which 355 * means that it's possible for multiple STP packets forms a 356 * full H:4 packet that means extra STP header + length doesn't 357 * indicate a full H:4 frame, things can fragment. Whose length 358 * recorded in STP header just shows up the most length the 359 * H:4 engine can handle currently. 360 */ 361 362 p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4); 363 if (!p_h4) 364 break; 365 366 adv = p_h4 - p_left; 367 sz_left -= adv; 368 p_left += adv; 369 370 bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4, 371 sz_h4, mtk_recv_pkts, 372 ARRAY_SIZE(mtk_recv_pkts)); 373 if (IS_ERR(bdev->rx_skb)) { 374 err = PTR_ERR(bdev->rx_skb); 375 bt_dev_err(bdev->hdev, 376 "Frame reassembly failed (%d)", err); 377 bdev->rx_skb = NULL; 378 return; 379 } 380 381 sz_left -= sz_h4; 382 p_left += sz_h4; 383 } 384} 385 386static size_t btmtkuart_receive_buf(struct serdev_device *serdev, 387 const u8 *data, size_t count) 388{ 389 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 390 391 btmtkuart_recv(bdev->hdev, data, count); 392 393 bdev->hdev->stat.byte_rx += count; 394 395 return count; 396} 397 398static void btmtkuart_write_wakeup(struct serdev_device *serdev) 399{ 400 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 401 402 btmtkuart_tx_wakeup(bdev); 403} 404 405static const struct serdev_device_ops btmtkuart_client_ops = { 406 .receive_buf = btmtkuart_receive_buf, 407 .write_wakeup = btmtkuart_write_wakeup, 408}; 409 410static int btmtkuart_open(struct hci_dev *hdev) 411{ 412 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 413 struct device *dev; 414 int err; 415 416 err = serdev_device_open(bdev->serdev); 417 if (err) { 418 bt_dev_err(hdev, "Unable to open UART device %s", 419 dev_name(&bdev->serdev->dev)); 420 goto err_open; 421 } 422 423 if (btmtkuart_is_standalone(bdev)) { 424 if (bdev->curr_speed != bdev->desired_speed) 425 err = serdev_device_set_baudrate(bdev->serdev, 426 115200); 427 else 428 err = serdev_device_set_baudrate(bdev->serdev, 429 bdev->desired_speed); 430 431 if (err < 0) { 432 bt_dev_err(hdev, "Unable to set baudrate UART device %s", 433 dev_name(&bdev->serdev->dev)); 434 goto err_serdev_close; 435 } 436 437 serdev_device_set_flow_control(bdev->serdev, false); 438 } 439 440 bdev->stp_cursor = 2; 441 bdev->stp_dlen = 0; 442 443 dev = &bdev->serdev->dev; 444 445 /* Enable the power domain and clock the device requires */ 446 pm_runtime_enable(dev); 447 err = pm_runtime_resume_and_get(dev); 448 if (err < 0) 449 goto err_disable_rpm; 450 451 err = clk_prepare_enable(bdev->clk); 452 if (err < 0) 453 goto err_put_rpm; 454 455 return 0; 456 457err_put_rpm: 458 pm_runtime_put_sync(dev); 459err_disable_rpm: 460 pm_runtime_disable(dev); 461err_serdev_close: 462 serdev_device_close(bdev->serdev); 463err_open: 464 return err; 465} 466 467static int btmtkuart_close(struct hci_dev *hdev) 468{ 469 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 470 struct device *dev = &bdev->serdev->dev; 471 472 /* Shutdown the clock and power domain the device requires */ 473 clk_disable_unprepare(bdev->clk); 474 pm_runtime_put_sync(dev); 475 pm_runtime_disable(dev); 476 477 serdev_device_close(bdev->serdev); 478 479 return 0; 480} 481 482static int btmtkuart_flush(struct hci_dev *hdev) 483{ 484 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 485 486 /* Flush any pending characters */ 487 serdev_device_write_flush(bdev->serdev); 488 skb_queue_purge(&bdev->txq); 489 490 cancel_work_sync(&bdev->tx_work); 491 492 kfree_skb(bdev->rx_skb); 493 bdev->rx_skb = NULL; 494 495 bdev->stp_cursor = 2; 496 bdev->stp_dlen = 0; 497 498 return 0; 499} 500 501static int btmtkuart_func_query(struct hci_dev *hdev) 502{ 503 struct btmtk_hci_wmt_params wmt_params; 504 int status, err; 505 u8 param = 0; 506 507 /* Query whether the function is enabled */ 508 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 509 wmt_params.flag = 4; 510 wmt_params.dlen = sizeof(param); 511 wmt_params.data = ¶m; 512 wmt_params.status = &status; 513 514 err = mtk_hci_wmt_sync(hdev, &wmt_params); 515 if (err < 0) { 516 bt_dev_err(hdev, "Failed to query function status (%d)", err); 517 return err; 518 } 519 520 return status; 521} 522 523static int btmtkuart_change_baudrate(struct hci_dev *hdev) 524{ 525 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 526 struct btmtk_hci_wmt_params wmt_params; 527 __le32 baudrate; 528 u8 param; 529 int err; 530 531 /* Indicate the device to enter the probe state the host is 532 * ready to change a new baudrate. 533 */ 534 baudrate = cpu_to_le32(bdev->desired_speed); 535 wmt_params.op = BTMTK_WMT_HIF; 536 wmt_params.flag = 1; 537 wmt_params.dlen = 4; 538 wmt_params.data = &baudrate; 539 wmt_params.status = NULL; 540 541 err = mtk_hci_wmt_sync(hdev, &wmt_params); 542 if (err < 0) { 543 bt_dev_err(hdev, "Failed to device baudrate (%d)", err); 544 return err; 545 } 546 547 err = serdev_device_set_baudrate(bdev->serdev, 548 bdev->desired_speed); 549 if (err < 0) { 550 bt_dev_err(hdev, "Failed to set up host baudrate (%d)", 551 err); 552 return err; 553 } 554 555 serdev_device_set_flow_control(bdev->serdev, false); 556 557 /* Send a dummy byte 0xff to activate the new baudrate */ 558 param = 0xff; 559 err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param)); 560 if (err < 0 || err < sizeof(param)) 561 return err; 562 563 serdev_device_wait_until_sent(bdev->serdev, 0); 564 565 /* Wait some time for the device changing baudrate done */ 566 usleep_range(20000, 22000); 567 568 /* Test the new baudrate */ 569 wmt_params.op = BTMTK_WMT_TEST; 570 wmt_params.flag = 7; 571 wmt_params.dlen = 0; 572 wmt_params.data = NULL; 573 wmt_params.status = NULL; 574 575 err = mtk_hci_wmt_sync(hdev, &wmt_params); 576 if (err < 0) { 577 bt_dev_err(hdev, "Failed to test new baudrate (%d)", 578 err); 579 return err; 580 } 581 582 bdev->curr_speed = bdev->desired_speed; 583 584 return 0; 585} 586 587static int btmtkuart_setup(struct hci_dev *hdev) 588{ 589 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 590 struct btmtk_hci_wmt_params wmt_params; 591 ktime_t calltime, delta, rettime; 592 struct btmtk_tci_sleep tci_sleep; 593 unsigned long long duration; 594 struct sk_buff *skb; 595 int err, status; 596 u8 param = 0x1; 597 598 calltime = ktime_get(); 599 600 /* Wakeup MCUSYS is required for certain devices before we start to 601 * do any setups. 602 */ 603 if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) { 604 wmt_params.op = BTMTK_WMT_WAKEUP; 605 wmt_params.flag = 3; 606 wmt_params.dlen = 0; 607 wmt_params.data = NULL; 608 wmt_params.status = NULL; 609 610 err = mtk_hci_wmt_sync(hdev, &wmt_params); 611 if (err < 0) { 612 bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err); 613 return err; 614 } 615 616 clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 617 } 618 619 if (btmtkuart_is_standalone(bdev)) 620 btmtkuart_change_baudrate(hdev); 621 622 /* Query whether the firmware is already download */ 623 wmt_params.op = BTMTK_WMT_SEMAPHORE; 624 wmt_params.flag = 1; 625 wmt_params.dlen = 0; 626 wmt_params.data = NULL; 627 wmt_params.status = &status; 628 629 err = mtk_hci_wmt_sync(hdev, &wmt_params); 630 if (err < 0) { 631 bt_dev_err(hdev, "Failed to query firmware status (%d)", err); 632 return err; 633 } 634 635 if (status == BTMTK_WMT_PATCH_DONE) { 636 bt_dev_info(hdev, "Firmware already downloaded"); 637 goto ignore_setup_fw; 638 } 639 640 /* Setup a firmware which the device definitely requires */ 641 err = btmtk_setup_firmware(hdev, bdev->data->fwname, mtk_hci_wmt_sync); 642 if (err < 0) 643 return err; 644 645ignore_setup_fw: 646 /* Query whether the device is already enabled */ 647 err = readx_poll_timeout(btmtkuart_func_query, hdev, status, 648 status < 0 || status != BTMTK_WMT_ON_PROGRESS, 649 2000, 5000000); 650 /* -ETIMEDOUT happens */ 651 if (err < 0) 652 return err; 653 654 /* The other errors happen in btusb_mtk_func_query */ 655 if (status < 0) 656 return status; 657 658 if (status == BTMTK_WMT_ON_DONE) { 659 bt_dev_info(hdev, "function already on"); 660 goto ignore_func_on; 661 } 662 663 /* Enable Bluetooth protocol */ 664 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 665 wmt_params.flag = 0; 666 wmt_params.dlen = sizeof(param); 667 wmt_params.data = ¶m; 668 wmt_params.status = NULL; 669 670 err = mtk_hci_wmt_sync(hdev, &wmt_params); 671 if (err < 0) { 672 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 673 return err; 674 } 675 676ignore_func_on: 677 /* Apply the low power environment setup */ 678 tci_sleep.mode = 0x5; 679 tci_sleep.duration = cpu_to_le16(0x640); 680 tci_sleep.host_duration = cpu_to_le16(0x640); 681 tci_sleep.host_wakeup_pin = 0; 682 tci_sleep.time_compensation = 0; 683 684 skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep, 685 HCI_INIT_TIMEOUT); 686 if (IS_ERR(skb)) { 687 err = PTR_ERR(skb); 688 bt_dev_err(hdev, "Failed to apply low power setting (%d)", err); 689 return err; 690 } 691 kfree_skb(skb); 692 693 rettime = ktime_get(); 694 delta = ktime_sub(rettime, calltime); 695 duration = (unsigned long long)ktime_to_ns(delta) >> 10; 696 697 bt_dev_info(hdev, "Device setup in %llu usecs", duration); 698 699 return 0; 700} 701 702static int btmtkuart_shutdown(struct hci_dev *hdev) 703{ 704 struct btmtk_hci_wmt_params wmt_params; 705 u8 param = 0x0; 706 int err; 707 708 /* Disable the device */ 709 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 710 wmt_params.flag = 0; 711 wmt_params.dlen = sizeof(param); 712 wmt_params.data = ¶m; 713 wmt_params.status = NULL; 714 715 err = mtk_hci_wmt_sync(hdev, &wmt_params); 716 if (err < 0) { 717 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 718 return err; 719 } 720 721 return 0; 722} 723 724static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 725{ 726 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 727 struct mtk_stp_hdr *shdr; 728 int err, dlen, type = 0; 729 730 /* Prepend skb with frame type */ 731 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 732 733 /* Make sure that there is enough rooms for STP header and trailer */ 734 if (unlikely(skb_headroom(skb) < sizeof(*shdr)) || 735 (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) { 736 err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE, 737 GFP_ATOMIC); 738 if (err < 0) 739 return err; 740 } 741 742 /* Add the STP header */ 743 dlen = skb->len; 744 shdr = skb_push(skb, sizeof(*shdr)); 745 shdr->prefix = 0x80; 746 shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12)); 747 shdr->cs = 0; /* MT7622 doesn't care about checksum value */ 748 749 /* Add the STP trailer */ 750 skb_put_zero(skb, MTK_STP_TLR_SIZE); 751 752 skb_queue_tail(&bdev->txq, skb); 753 754 btmtkuart_tx_wakeup(bdev); 755 return 0; 756} 757 758static int btmtkuart_parse_dt(struct serdev_device *serdev) 759{ 760 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 761 struct device_node *node = serdev->dev.of_node; 762 u32 speed = 921600; 763 int err; 764 765 if (btmtkuart_is_standalone(bdev)) { 766 of_property_read_u32(node, "current-speed", &speed); 767 768 bdev->desired_speed = speed; 769 770 bdev->vcc = devm_regulator_get(&serdev->dev, "vcc"); 771 if (IS_ERR(bdev->vcc)) { 772 err = PTR_ERR(bdev->vcc); 773 return err; 774 } 775 776 bdev->osc = devm_clk_get_optional(&serdev->dev, "osc"); 777 if (IS_ERR(bdev->osc)) { 778 err = PTR_ERR(bdev->osc); 779 return err; 780 } 781 782 bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot", 783 GPIOD_OUT_LOW); 784 if (IS_ERR(bdev->boot)) { 785 err = PTR_ERR(bdev->boot); 786 return err; 787 } 788 789 bdev->pinctrl = devm_pinctrl_get(&serdev->dev); 790 if (IS_ERR(bdev->pinctrl)) { 791 err = PTR_ERR(bdev->pinctrl); 792 return err; 793 } 794 795 bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl, 796 "default"); 797 if (IS_ERR(bdev->pins_boot) && !bdev->boot) { 798 err = PTR_ERR(bdev->pins_boot); 799 dev_err(&serdev->dev, 800 "Should assign RXD to LOW at boot stage\n"); 801 return err; 802 } 803 804 bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl, 805 "runtime"); 806 if (IS_ERR(bdev->pins_runtime)) { 807 err = PTR_ERR(bdev->pins_runtime); 808 return err; 809 } 810 811 bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset", 812 GPIOD_OUT_LOW); 813 if (IS_ERR(bdev->reset)) { 814 err = PTR_ERR(bdev->reset); 815 return err; 816 } 817 } else if (btmtkuart_is_builtin_soc(bdev)) { 818 bdev->clk = devm_clk_get(&serdev->dev, "ref"); 819 if (IS_ERR(bdev->clk)) 820 return PTR_ERR(bdev->clk); 821 } 822 823 return 0; 824} 825 826static int btmtkuart_probe(struct serdev_device *serdev) 827{ 828 struct btmtkuart_dev *bdev; 829 struct hci_dev *hdev; 830 int err; 831 832 bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL); 833 if (!bdev) 834 return -ENOMEM; 835 836 bdev->data = of_device_get_match_data(&serdev->dev); 837 if (!bdev->data) 838 return -ENODEV; 839 840 bdev->serdev = serdev; 841 serdev_device_set_drvdata(serdev, bdev); 842 843 serdev_device_set_client_ops(serdev, &btmtkuart_client_ops); 844 845 err = btmtkuart_parse_dt(serdev); 846 if (err < 0) 847 return err; 848 849 INIT_WORK(&bdev->tx_work, btmtkuart_tx_work); 850 skb_queue_head_init(&bdev->txq); 851 852 /* Initialize and register HCI device */ 853 hdev = hci_alloc_dev(); 854 if (!hdev) { 855 dev_err(&serdev->dev, "Can't allocate HCI device\n"); 856 return -ENOMEM; 857 } 858 859 bdev->hdev = hdev; 860 861 hdev->bus = HCI_UART; 862 hci_set_drvdata(hdev, bdev); 863 864 hdev->open = btmtkuart_open; 865 hdev->close = btmtkuart_close; 866 hdev->flush = btmtkuart_flush; 867 hdev->setup = btmtkuart_setup; 868 hdev->shutdown = btmtkuart_shutdown; 869 hdev->send = btmtkuart_send_frame; 870 hdev->set_bdaddr = btmtk_set_bdaddr; 871 SET_HCIDEV_DEV(hdev, &serdev->dev); 872 873 hdev->manufacturer = 70; 874 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); 875 876 if (btmtkuart_is_standalone(bdev)) { 877 err = clk_prepare_enable(bdev->osc); 878 if (err < 0) 879 goto err_hci_free_dev; 880 881 if (bdev->boot) { 882 gpiod_set_value_cansleep(bdev->boot, 1); 883 } else { 884 /* Switch to the specific pin state for the booting 885 * requires. 886 */ 887 pinctrl_select_state(bdev->pinctrl, bdev->pins_boot); 888 } 889 890 /* Power on */ 891 err = regulator_enable(bdev->vcc); 892 if (err < 0) 893 goto err_clk_disable_unprepare; 894 895 /* Reset if the reset-gpios is available otherwise the board 896 * -level design should be guaranteed. 897 */ 898 if (bdev->reset) { 899 gpiod_set_value_cansleep(bdev->reset, 1); 900 usleep_range(1000, 2000); 901 gpiod_set_value_cansleep(bdev->reset, 0); 902 } 903 904 /* Wait some time until device got ready and switch to the pin 905 * mode the device requires for UART transfers. 906 */ 907 msleep(50); 908 909 if (bdev->boot) 910 devm_gpiod_put(&serdev->dev, bdev->boot); 911 912 pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime); 913 914 /* A standalone device doesn't depends on power domain on SoC, 915 * so mark it as no callbacks. 916 */ 917 pm_runtime_no_callbacks(&serdev->dev); 918 919 set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 920 } 921 922 err = hci_register_dev(hdev); 923 if (err < 0) { 924 dev_err(&serdev->dev, "Can't register HCI device\n"); 925 goto err_regulator_disable; 926 } 927 928 return 0; 929 930err_regulator_disable: 931 if (btmtkuart_is_standalone(bdev)) 932 regulator_disable(bdev->vcc); 933err_clk_disable_unprepare: 934 if (btmtkuart_is_standalone(bdev)) 935 clk_disable_unprepare(bdev->osc); 936err_hci_free_dev: 937 hci_free_dev(hdev); 938 939 return err; 940} 941 942static void btmtkuart_remove(struct serdev_device *serdev) 943{ 944 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 945 struct hci_dev *hdev = bdev->hdev; 946 947 if (btmtkuart_is_standalone(bdev)) { 948 regulator_disable(bdev->vcc); 949 clk_disable_unprepare(bdev->osc); 950 } 951 952 hci_unregister_dev(hdev); 953 hci_free_dev(hdev); 954} 955 956static const struct btmtkuart_data mt7622_data __maybe_unused = { 957 .fwname = FIRMWARE_MT7622, 958}; 959 960static const struct btmtkuart_data mt7663_data __maybe_unused = { 961 .flags = BTMTKUART_FLAG_STANDALONE_HW, 962 .fwname = FIRMWARE_MT7663, 963}; 964 965static const struct btmtkuart_data mt7668_data __maybe_unused = { 966 .flags = BTMTKUART_FLAG_STANDALONE_HW, 967 .fwname = FIRMWARE_MT7668, 968}; 969 970#ifdef CONFIG_OF 971static const struct of_device_id mtk_of_match_table[] = { 972 { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data}, 973 { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data}, 974 { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data}, 975 { } 976}; 977MODULE_DEVICE_TABLE(of, mtk_of_match_table); 978#endif 979 980static struct serdev_device_driver btmtkuart_driver = { 981 .probe = btmtkuart_probe, 982 .remove = btmtkuart_remove, 983 .driver = { 984 .name = "btmtkuart", 985 .of_match_table = of_match_ptr(mtk_of_match_table), 986 }, 987}; 988 989module_serdev_device_driver(btmtkuart_driver); 990 991MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); 992MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION); 993MODULE_VERSION(VERSION); 994MODULE_LICENSE("GPL"); 995