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 <linux/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 #include <linux/usb.h> 26 27 #include <net/bluetooth/bluetooth.h> 28 #include <net/bluetooth/hci_core.h> 29 30 #include "hci_uart.h" 31 #include "btmtk.h" 32 33 #define VERSION "0.2" 34 35 #define MTK_STP_TLR_SIZE 2 36 37 #define BTMTKUART_TX_STATE_ACTIVE 1 38 #define BTMTKUART_TX_STATE_WAKEUP 2 39 #define BTMTKUART_TX_WAIT_VND_EVT 3 40 #define BTMTKUART_REQUIRED_WAKEUP 4 41 42 #define BTMTKUART_FLAG_STANDALONE_HW BIT(0) 43 44 struct mtk_stp_hdr { 45 u8 prefix; 46 __be16 dlen; 47 u8 cs; 48 } __packed; 49 50 struct btmtkuart_data { 51 unsigned int flags; 52 const char *fwname; 53 }; 54 55 struct btmtkuart_dev { 56 struct hci_dev *hdev; 57 struct serdev_device *serdev; 58 59 struct clk *clk; 60 struct clk *osc; 61 struct regulator *vcc; 62 struct gpio_desc *reset; 63 struct gpio_desc *boot; 64 struct pinctrl *pinctrl; 65 struct pinctrl_state *pins_runtime; 66 struct pinctrl_state *pins_boot; 67 speed_t desired_speed; 68 speed_t curr_speed; 69 70 struct work_struct tx_work; 71 unsigned long tx_state; 72 struct sk_buff_head txq; 73 74 struct sk_buff *rx_skb; 75 struct sk_buff *evt_skb; 76 77 u8 stp_pad[6]; 78 u8 stp_cursor; 79 u16 stp_dlen; 80 81 const struct btmtkuart_data *data; 82 struct hci_uart hu; 83 }; 84 85 #define btmtkuart_is_standalone(bdev) \ 86 ((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW) 87 #define btmtkuart_is_builtin_soc(bdev) \ 88 !((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW) 89 90 static int mtk_hci_wmt_sync(struct hci_dev *hdev, 91 struct btmtk_hci_wmt_params *wmt_params) 92 { 93 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 94 struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc; 95 u32 hlen, status = BTMTK_WMT_INVALID; 96 struct btmtk_hci_wmt_evt *wmt_evt; 97 struct btmtk_hci_wmt_cmd *wc; 98 struct btmtk_wmt_hdr *hdr; 99 int err; 100 101 /* Send the WMT command and wait until the WMT event returns */ 102 hlen = sizeof(*hdr) + wmt_params->dlen; 103 if (hlen > 255) { 104 err = -EINVAL; 105 goto err_free_skb; 106 } 107 108 wc = kzalloc(hlen, GFP_KERNEL); 109 if (!wc) { 110 err = -ENOMEM; 111 goto err_free_skb; 112 } 113 114 hdr = &wc->hdr; 115 hdr->dir = 1; 116 hdr->op = wmt_params->op; 117 hdr->dlen = cpu_to_le16(wmt_params->dlen + 1); 118 hdr->flag = wmt_params->flag; 119 memcpy(wc->data, wmt_params->data, wmt_params->dlen); 120 121 set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 122 123 err = __hci_cmd_send(hdev, 0xfc6f, hlen, wc); 124 if (err < 0) { 125 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 126 goto err_free_wc; 127 } 128 129 /* The vendor specific WMT commands are all answered by a vendor 130 * specific event and will not have the Command Status or Command 131 * Complete as with usual HCI command flow control. 132 * 133 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT 134 * state to be cleared. The driver specific event receive routine 135 * will clear that state and with that indicate completion of the 136 * WMT command. 137 */ 138 err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT, 139 TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT); 140 if (err == -EINTR) { 141 bt_dev_err(hdev, "Execution of wmt command interrupted"); 142 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 143 goto err_free_wc; 144 } 145 146 if (err) { 147 bt_dev_err(hdev, "Execution of wmt command timed out"); 148 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 149 err = -ETIMEDOUT; 150 goto err_free_wc; 151 } 152 153 /* Parse and handle the return WMT event */ 154 wmt_evt = skb_pull_data(bdev->evt_skb, sizeof(*wmt_evt)); 155 if (!wmt_evt) { 156 bt_dev_err(hdev, "WMT event too short (%u bytes)", 157 bdev->evt_skb->len); 158 err = -EINVAL; 159 goto err_free_wc; 160 } 161 162 if (wmt_evt->whdr.op != hdr->op) { 163 bt_dev_err(hdev, "Wrong op received %d expected %d", 164 wmt_evt->whdr.op, hdr->op); 165 err = -EIO; 166 goto err_free_wc; 167 } 168 169 switch (wmt_evt->whdr.op) { 170 case BTMTK_WMT_SEMAPHORE: 171 if (wmt_evt->whdr.flag == 2) 172 status = BTMTK_WMT_PATCH_UNDONE; 173 else 174 status = BTMTK_WMT_PATCH_DONE; 175 break; 176 case BTMTK_WMT_FUNC_CTRL: 177 if (!skb_pull_data(bdev->evt_skb, 178 sizeof(wmt_evt_funcc->status))) { 179 /* A plain enable/disable request is acked with just 180 * the WMT header and no trailing status word; the 181 * result is carried in the header's own flag byte. 182 */ 183 status = wmt_evt->whdr.flag ? BTMTK_WMT_ON_UNDONE : 184 BTMTK_WMT_ON_DONE; 185 break; 186 } 187 188 wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt; 189 if (be16_to_cpu(wmt_evt_funcc->status) == 0x404) 190 status = BTMTK_WMT_ON_DONE; 191 else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420) 192 status = BTMTK_WMT_ON_PROGRESS; 193 else 194 status = BTMTK_WMT_ON_UNDONE; 195 break; 196 } 197 198 if (wmt_params->status) 199 *wmt_params->status = status; 200 201 err_free_wc: 202 kfree(wc); 203 err_free_skb: 204 kfree_skb(bdev->evt_skb); 205 bdev->evt_skb = NULL; 206 207 return err; 208 } 209 210 static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb) 211 { 212 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 213 struct hci_event_hdr *hdr = (void *)skb->data; 214 int err; 215 216 /* When someone waits for the WMT event, the skb is being cloned 217 * and being processed the events from there then. 218 */ 219 if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) { 220 bdev->evt_skb = skb_clone(skb, GFP_KERNEL); 221 if (!bdev->evt_skb) { 222 err = -ENOMEM; 223 goto err_out; 224 } 225 } 226 227 err = hci_recv_frame(hdev, skb); 228 if (err < 0) 229 goto err_free_skb; 230 231 if (hdr->evt == HCI_EV_WMT) { 232 if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT, 233 &bdev->tx_state)) { 234 /* Barrier to sync with other CPUs */ 235 smp_mb__after_atomic(); 236 wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT); 237 } 238 } 239 240 return 0; 241 242 err_free_skb: 243 kfree_skb(bdev->evt_skb); 244 bdev->evt_skb = NULL; 245 246 err_out: 247 return err; 248 } 249 250 static const struct h4_recv_pkt mtk_recv_pkts[] = { 251 { H4_RECV_ACL, .recv = hci_recv_frame }, 252 { H4_RECV_SCO, .recv = hci_recv_frame }, 253 { H4_RECV_EVENT, .recv = btmtkuart_recv_event }, 254 }; 255 256 static void btmtkuart_tx_work(struct work_struct *work) 257 { 258 struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev, 259 tx_work); 260 struct serdev_device *serdev = bdev->serdev; 261 struct hci_dev *hdev = bdev->hdev; 262 263 while (1) { 264 clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state); 265 266 while (1) { 267 struct sk_buff *skb = skb_dequeue(&bdev->txq); 268 int len; 269 270 if (!skb) 271 break; 272 273 len = serdev_device_write_buf(serdev, skb->data, 274 skb->len); 275 hdev->stat.byte_tx += len; 276 277 skb_pull(skb, len); 278 if (skb->len > 0) { 279 skb_queue_head(&bdev->txq, skb); 280 break; 281 } 282 283 switch (hci_skb_pkt_type(skb)) { 284 case HCI_COMMAND_PKT: 285 hdev->stat.cmd_tx++; 286 break; 287 case HCI_ACLDATA_PKT: 288 hdev->stat.acl_tx++; 289 break; 290 case HCI_SCODATA_PKT: 291 hdev->stat.sco_tx++; 292 break; 293 } 294 295 kfree_skb(skb); 296 } 297 298 if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state)) 299 break; 300 } 301 302 clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state); 303 } 304 305 static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev) 306 { 307 if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state)) 308 set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state); 309 310 schedule_work(&bdev->tx_work); 311 } 312 313 static const unsigned char * 314 mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count, 315 int *sz_h4) 316 { 317 struct mtk_stp_hdr *shdr; 318 319 /* The cursor is reset when all the data of STP is consumed out */ 320 if (!bdev->stp_dlen && bdev->stp_cursor >= 6) 321 bdev->stp_cursor = 0; 322 323 /* Filling pad until all STP info is obtained */ 324 while (bdev->stp_cursor < 6 && count > 0) { 325 bdev->stp_pad[bdev->stp_cursor] = *data; 326 bdev->stp_cursor++; 327 data++; 328 count--; 329 } 330 331 /* Retrieve STP info and have a sanity check */ 332 if (!bdev->stp_dlen && bdev->stp_cursor >= 6) { 333 shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2]; 334 bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff; 335 336 /* Resync STP when unexpected data is being read */ 337 if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) { 338 bt_dev_err(bdev->hdev, "stp format unexpected (%d, %d)", 339 shdr->prefix, bdev->stp_dlen); 340 bdev->stp_cursor = 2; 341 bdev->stp_dlen = 0; 342 } 343 } 344 345 /* Directly quit when there's no data found for H4 can process */ 346 if (count <= 0) 347 return NULL; 348 349 /* Translate to how much the size of data H4 can handle so far */ 350 *sz_h4 = min_t(int, count, bdev->stp_dlen); 351 352 /* Update the remaining size of STP packet */ 353 bdev->stp_dlen -= *sz_h4; 354 355 /* Data points to STP payload which can be handled by H4 */ 356 return data; 357 } 358 359 static void btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count) 360 { 361 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 362 const unsigned char *p_left = data, *p_h4; 363 int sz_left = count, sz_h4, adv; 364 int err; 365 366 while (sz_left > 0) { 367 /* The serial data received from MT7622 BT controller is 368 * at all time padded around with the STP header and tailer. 369 * 370 * A full STP packet is looking like 371 * ----------------------------------- 372 * | STP header | H:4 | STP tailer | 373 * ----------------------------------- 374 * but it doesn't guarantee to contain a full H:4 packet which 375 * means that it's possible for multiple STP packets forms a 376 * full H:4 packet that means extra STP header + length doesn't 377 * indicate a full H:4 frame, things can fragment. Whose length 378 * recorded in STP header just shows up the most length the 379 * H:4 engine can handle currently. 380 */ 381 382 p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4); 383 if (!p_h4) 384 break; 385 386 adv = p_h4 - p_left; 387 sz_left -= adv; 388 p_left += adv; 389 390 bdev->rx_skb = h4_recv_buf(&bdev->hu, bdev->rx_skb, p_h4, 391 sz_h4, mtk_recv_pkts, 392 ARRAY_SIZE(mtk_recv_pkts)); 393 if (IS_ERR(bdev->rx_skb)) { 394 err = PTR_ERR(bdev->rx_skb); 395 bt_dev_err(bdev->hdev, 396 "Frame reassembly failed (%d)", err); 397 bdev->rx_skb = NULL; 398 return; 399 } 400 401 sz_left -= sz_h4; 402 p_left += sz_h4; 403 } 404 } 405 406 static size_t btmtkuart_receive_buf(struct serdev_device *serdev, 407 const u8 *data, size_t count) 408 { 409 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 410 411 btmtkuart_recv(bdev->hdev, data, count); 412 413 bdev->hdev->stat.byte_rx += count; 414 415 return count; 416 } 417 418 static void btmtkuart_write_wakeup(struct serdev_device *serdev) 419 { 420 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 421 422 btmtkuart_tx_wakeup(bdev); 423 } 424 425 static const struct serdev_device_ops btmtkuart_client_ops = { 426 .receive_buf = btmtkuart_receive_buf, 427 .write_wakeup = btmtkuart_write_wakeup, 428 }; 429 430 static int btmtkuart_open(struct hci_dev *hdev) 431 { 432 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 433 struct device *dev; 434 int err; 435 436 err = serdev_device_open(bdev->serdev); 437 if (err) { 438 bt_dev_err(hdev, "Unable to open UART device %s", 439 dev_name(&bdev->serdev->dev)); 440 goto err_open; 441 } 442 443 if (btmtkuart_is_standalone(bdev)) { 444 if (bdev->curr_speed != bdev->desired_speed) 445 err = serdev_device_set_baudrate(bdev->serdev, 446 115200); 447 else 448 err = serdev_device_set_baudrate(bdev->serdev, 449 bdev->desired_speed); 450 451 if (err < 0) { 452 bt_dev_err(hdev, "Unable to set baudrate UART device %s", 453 dev_name(&bdev->serdev->dev)); 454 goto err_serdev_close; 455 } 456 457 serdev_device_set_flow_control(bdev->serdev, false); 458 } 459 460 bdev->stp_cursor = 2; 461 bdev->stp_dlen = 0; 462 463 dev = &bdev->serdev->dev; 464 465 /* Enable the power domain and clock the device requires */ 466 pm_runtime_enable(dev); 467 err = pm_runtime_resume_and_get(dev); 468 if (err < 0) 469 goto err_disable_rpm; 470 471 err = clk_prepare_enable(bdev->clk); 472 if (err < 0) 473 goto err_put_rpm; 474 475 return 0; 476 477 err_put_rpm: 478 pm_runtime_put_sync(dev); 479 err_disable_rpm: 480 pm_runtime_disable(dev); 481 err_serdev_close: 482 serdev_device_close(bdev->serdev); 483 err_open: 484 return err; 485 } 486 487 static int btmtkuart_close(struct hci_dev *hdev) 488 { 489 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 490 struct device *dev = &bdev->serdev->dev; 491 492 /* Shutdown the clock and power domain the device requires */ 493 clk_disable_unprepare(bdev->clk); 494 pm_runtime_put_sync(dev); 495 pm_runtime_disable(dev); 496 497 serdev_device_close(bdev->serdev); 498 499 return 0; 500 } 501 502 static int btmtkuart_flush(struct hci_dev *hdev) 503 { 504 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 505 506 /* Flush any pending characters */ 507 serdev_device_write_flush(bdev->serdev); 508 skb_queue_purge(&bdev->txq); 509 510 cancel_work_sync(&bdev->tx_work); 511 512 kfree_skb(bdev->rx_skb); 513 bdev->rx_skb = NULL; 514 515 bdev->stp_cursor = 2; 516 bdev->stp_dlen = 0; 517 518 return 0; 519 } 520 521 static int btmtkuart_func_query(struct hci_dev *hdev) 522 { 523 struct btmtk_hci_wmt_params wmt_params; 524 int status, err; 525 u8 param = 0; 526 527 /* Query whether the function is enabled */ 528 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 529 wmt_params.flag = 4; 530 wmt_params.dlen = sizeof(param); 531 wmt_params.data = ¶m; 532 wmt_params.status = &status; 533 534 err = mtk_hci_wmt_sync(hdev, &wmt_params); 535 if (err < 0) { 536 bt_dev_err(hdev, "Failed to query function status (%d)", err); 537 return err; 538 } 539 540 return status; 541 } 542 543 static int btmtkuart_change_baudrate(struct hci_dev *hdev) 544 { 545 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 546 struct btmtk_hci_wmt_params wmt_params; 547 __le32 baudrate; 548 u8 param; 549 int err; 550 551 /* Indicate the device to enter the probe state the host is 552 * ready to change a new baudrate. 553 */ 554 baudrate = cpu_to_le32(bdev->desired_speed); 555 wmt_params.op = BTMTK_WMT_HIF; 556 wmt_params.flag = 1; 557 wmt_params.dlen = 4; 558 wmt_params.data = &baudrate; 559 wmt_params.status = NULL; 560 561 err = mtk_hci_wmt_sync(hdev, &wmt_params); 562 if (err < 0) { 563 bt_dev_err(hdev, "Failed to device baudrate (%d)", err); 564 return err; 565 } 566 567 err = serdev_device_set_baudrate(bdev->serdev, 568 bdev->desired_speed); 569 if (err < 0) { 570 bt_dev_err(hdev, "Failed to set up host baudrate (%d)", 571 err); 572 return err; 573 } 574 575 serdev_device_set_flow_control(bdev->serdev, false); 576 577 /* Send a dummy byte 0xff to activate the new baudrate */ 578 param = 0xff; 579 err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param)); 580 if (err < 0 || err < sizeof(param)) 581 return err; 582 583 serdev_device_wait_until_sent(bdev->serdev, 0); 584 585 /* Wait some time for the device changing baudrate done */ 586 usleep_range(20000, 22000); 587 588 /* Test the new baudrate */ 589 wmt_params.op = BTMTK_WMT_TEST; 590 wmt_params.flag = 7; 591 wmt_params.dlen = 0; 592 wmt_params.data = NULL; 593 wmt_params.status = NULL; 594 595 err = mtk_hci_wmt_sync(hdev, &wmt_params); 596 if (err < 0) { 597 bt_dev_err(hdev, "Failed to test new baudrate (%d)", 598 err); 599 return err; 600 } 601 602 bdev->curr_speed = bdev->desired_speed; 603 604 return 0; 605 } 606 607 static int btmtkuart_setup(struct hci_dev *hdev) 608 { 609 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 610 struct btmtk_hci_wmt_params wmt_params; 611 ktime_t calltime, delta, rettime; 612 struct btmtk_tci_sleep tci_sleep; 613 unsigned long long duration; 614 struct sk_buff *skb; 615 int err, status; 616 u8 param = 0x1; 617 618 calltime = ktime_get(); 619 620 /* Wakeup MCUSYS is required for certain devices before we start to 621 * do any setups. 622 */ 623 if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) { 624 wmt_params.op = BTMTK_WMT_WAKEUP; 625 wmt_params.flag = 3; 626 wmt_params.dlen = 0; 627 wmt_params.data = NULL; 628 wmt_params.status = NULL; 629 630 err = mtk_hci_wmt_sync(hdev, &wmt_params); 631 if (err < 0) { 632 bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err); 633 return err; 634 } 635 636 clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 637 } 638 639 if (btmtkuart_is_standalone(bdev)) 640 btmtkuart_change_baudrate(hdev); 641 642 /* Query whether the firmware is already download */ 643 wmt_params.op = BTMTK_WMT_SEMAPHORE; 644 wmt_params.flag = 1; 645 wmt_params.dlen = 0; 646 wmt_params.data = NULL; 647 wmt_params.status = &status; 648 649 err = mtk_hci_wmt_sync(hdev, &wmt_params); 650 if (err < 0) { 651 bt_dev_err(hdev, "Failed to query firmware status (%d)", err); 652 return err; 653 } 654 655 if (status == BTMTK_WMT_PATCH_DONE) { 656 bt_dev_info(hdev, "Firmware already downloaded"); 657 goto ignore_setup_fw; 658 } 659 660 /* Setup a firmware which the device definitely requires */ 661 err = btmtk_setup_firmware(hdev, bdev->data->fwname, mtk_hci_wmt_sync); 662 if (err < 0) 663 return err; 664 665 ignore_setup_fw: 666 /* Query whether the device is already enabled */ 667 err = readx_poll_timeout(btmtkuart_func_query, hdev, status, 668 status < 0 || status != BTMTK_WMT_ON_PROGRESS, 669 2000, 5000000); 670 /* -ETIMEDOUT happens */ 671 if (err < 0) 672 return err; 673 674 /* The other errors happen in btusb_mtk_func_query */ 675 if (status < 0) 676 return status; 677 678 if (status == BTMTK_WMT_ON_DONE) { 679 bt_dev_info(hdev, "function already on"); 680 goto ignore_func_on; 681 } 682 683 /* Enable Bluetooth protocol */ 684 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 685 wmt_params.flag = 0; 686 wmt_params.dlen = sizeof(param); 687 wmt_params.data = ¶m; 688 wmt_params.status = NULL; 689 690 err = mtk_hci_wmt_sync(hdev, &wmt_params); 691 if (err < 0) { 692 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 693 return err; 694 } 695 696 ignore_func_on: 697 /* Apply the low power environment setup */ 698 tci_sleep.mode = 0x5; 699 tci_sleep.duration = cpu_to_le16(0x640); 700 tci_sleep.host_duration = cpu_to_le16(0x640); 701 tci_sleep.host_wakeup_pin = 0; 702 tci_sleep.time_compensation = 0; 703 704 skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep, 705 HCI_INIT_TIMEOUT); 706 if (IS_ERR(skb)) { 707 err = PTR_ERR(skb); 708 bt_dev_err(hdev, "Failed to apply low power setting (%d)", err); 709 return err; 710 } 711 kfree_skb(skb); 712 713 rettime = ktime_get(); 714 delta = ktime_sub(rettime, calltime); 715 duration = (unsigned long long)ktime_to_ns(delta) >> 10; 716 717 bt_dev_info(hdev, "Device setup in %llu usecs", duration); 718 719 return 0; 720 } 721 722 static int btmtkuart_shutdown(struct hci_dev *hdev) 723 { 724 struct btmtk_hci_wmt_params wmt_params; 725 u8 param = 0x0; 726 int err; 727 728 /* Disable the device */ 729 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 730 wmt_params.flag = 0; 731 wmt_params.dlen = sizeof(param); 732 wmt_params.data = ¶m; 733 wmt_params.status = NULL; 734 735 err = mtk_hci_wmt_sync(hdev, &wmt_params); 736 if (err < 0) { 737 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 738 return err; 739 } 740 741 return 0; 742 } 743 744 static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 745 { 746 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 747 struct mtk_stp_hdr *shdr; 748 int err, dlen, type = 0; 749 750 /* Prepend skb with frame type */ 751 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 752 753 /* Make sure that there is enough rooms for STP header and trailer */ 754 if (unlikely(skb_headroom(skb) < sizeof(*shdr)) || 755 (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) { 756 err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE, 757 GFP_ATOMIC); 758 if (err < 0) 759 return err; 760 } 761 762 /* Add the STP header */ 763 dlen = skb->len; 764 shdr = skb_push(skb, sizeof(*shdr)); 765 shdr->prefix = 0x80; 766 shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12)); 767 shdr->cs = 0; /* MT7622 doesn't care about checksum value */ 768 769 /* Add the STP trailer */ 770 skb_put_zero(skb, MTK_STP_TLR_SIZE); 771 772 skb_queue_tail(&bdev->txq, skb); 773 774 btmtkuart_tx_wakeup(bdev); 775 return 0; 776 } 777 778 static int btmtkuart_parse_dt(struct serdev_device *serdev) 779 { 780 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 781 struct device_node *node = serdev->dev.of_node; 782 u32 speed = 921600; 783 int err; 784 785 if (btmtkuart_is_standalone(bdev)) { 786 of_property_read_u32(node, "current-speed", &speed); 787 788 bdev->desired_speed = speed; 789 790 bdev->vcc = devm_regulator_get(&serdev->dev, "vcc"); 791 if (IS_ERR(bdev->vcc)) { 792 err = PTR_ERR(bdev->vcc); 793 return err; 794 } 795 796 bdev->osc = devm_clk_get_optional(&serdev->dev, "osc"); 797 if (IS_ERR(bdev->osc)) { 798 err = PTR_ERR(bdev->osc); 799 return err; 800 } 801 802 bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot", 803 GPIOD_OUT_LOW); 804 if (IS_ERR(bdev->boot)) { 805 err = PTR_ERR(bdev->boot); 806 return err; 807 } 808 809 bdev->pinctrl = devm_pinctrl_get(&serdev->dev); 810 if (IS_ERR(bdev->pinctrl)) { 811 err = PTR_ERR(bdev->pinctrl); 812 return err; 813 } 814 815 bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl, 816 "default"); 817 if (IS_ERR(bdev->pins_boot) && !bdev->boot) { 818 err = PTR_ERR(bdev->pins_boot); 819 dev_err(&serdev->dev, 820 "Should assign RXD to LOW at boot stage\n"); 821 return err; 822 } 823 824 bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl, 825 "runtime"); 826 if (IS_ERR(bdev->pins_runtime)) { 827 err = PTR_ERR(bdev->pins_runtime); 828 return err; 829 } 830 831 bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset", 832 GPIOD_OUT_LOW); 833 if (IS_ERR(bdev->reset)) { 834 err = PTR_ERR(bdev->reset); 835 return err; 836 } 837 } else if (btmtkuart_is_builtin_soc(bdev)) { 838 bdev->clk = devm_clk_get(&serdev->dev, "ref"); 839 if (IS_ERR(bdev->clk)) 840 return PTR_ERR(bdev->clk); 841 } 842 843 return 0; 844 } 845 846 static int btmtkuart_probe(struct serdev_device *serdev) 847 { 848 struct btmtkuart_dev *bdev; 849 struct hci_dev *hdev; 850 int err; 851 852 bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL); 853 if (!bdev) 854 return -ENOMEM; 855 856 bdev->data = of_device_get_match_data(&serdev->dev); 857 if (!bdev->data) 858 return -ENODEV; 859 860 bdev->serdev = serdev; 861 serdev_device_set_drvdata(serdev, bdev); 862 863 serdev_device_set_client_ops(serdev, &btmtkuart_client_ops); 864 865 err = btmtkuart_parse_dt(serdev); 866 if (err < 0) 867 return err; 868 869 INIT_WORK(&bdev->tx_work, btmtkuart_tx_work); 870 skb_queue_head_init(&bdev->txq); 871 872 /* Initialize and register HCI device */ 873 hdev = hci_alloc_dev(); 874 if (!hdev) { 875 dev_err(&serdev->dev, "Can't allocate HCI device\n"); 876 return -ENOMEM; 877 } 878 879 bdev->hdev = hdev; 880 bdev->hu.hdev = hdev; 881 882 hdev->bus = HCI_UART; 883 hci_set_drvdata(hdev, bdev); 884 885 hdev->open = btmtkuart_open; 886 hdev->close = btmtkuart_close; 887 hdev->flush = btmtkuart_flush; 888 hdev->setup = btmtkuart_setup; 889 hdev->shutdown = btmtkuart_shutdown; 890 hdev->send = btmtkuart_send_frame; 891 hdev->set_bdaddr = btmtk_set_bdaddr; 892 SET_HCIDEV_DEV(hdev, &serdev->dev); 893 894 hdev->manufacturer = 70; 895 hci_set_quirk(hdev, HCI_QUIRK_NON_PERSISTENT_SETUP); 896 897 if (btmtkuart_is_standalone(bdev)) { 898 err = clk_prepare_enable(bdev->osc); 899 if (err < 0) 900 goto err_hci_free_dev; 901 902 if (bdev->boot) { 903 gpiod_set_value_cansleep(bdev->boot, 1); 904 } else { 905 /* Switch to the specific pin state for the booting 906 * requires. 907 */ 908 pinctrl_select_state(bdev->pinctrl, bdev->pins_boot); 909 } 910 911 /* Power on */ 912 err = regulator_enable(bdev->vcc); 913 if (err < 0) 914 goto err_clk_disable_unprepare; 915 916 /* Reset if the reset-gpios is available otherwise the board 917 * -level design should be guaranteed. 918 */ 919 if (bdev->reset) { 920 gpiod_set_value_cansleep(bdev->reset, 1); 921 usleep_range(1000, 2000); 922 gpiod_set_value_cansleep(bdev->reset, 0); 923 } 924 925 /* Wait some time until device got ready and switch to the pin 926 * mode the device requires for UART transfers. 927 */ 928 msleep(50); 929 930 if (bdev->boot) 931 devm_gpiod_put(&serdev->dev, bdev->boot); 932 933 pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime); 934 935 /* A standalone device doesn't depends on power domain on SoC, 936 * so mark it as no callbacks. 937 */ 938 pm_runtime_no_callbacks(&serdev->dev); 939 940 set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 941 } 942 943 err = hci_register_dev(hdev); 944 if (err < 0) { 945 dev_err(&serdev->dev, "Can't register HCI device\n"); 946 goto err_regulator_disable; 947 } 948 949 return 0; 950 951 err_regulator_disable: 952 if (btmtkuart_is_standalone(bdev)) 953 regulator_disable(bdev->vcc); 954 err_clk_disable_unprepare: 955 if (btmtkuart_is_standalone(bdev)) 956 clk_disable_unprepare(bdev->osc); 957 err_hci_free_dev: 958 hci_free_dev(hdev); 959 960 return err; 961 } 962 963 static void btmtkuart_remove(struct serdev_device *serdev) 964 { 965 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 966 struct hci_dev *hdev = bdev->hdev; 967 968 if (btmtkuart_is_standalone(bdev)) { 969 regulator_disable(bdev->vcc); 970 clk_disable_unprepare(bdev->osc); 971 } 972 973 hci_unregister_dev(hdev); 974 hci_free_dev(hdev); 975 } 976 977 static const struct btmtkuart_data mt7622_data __maybe_unused = { 978 .fwname = FIRMWARE_MT7622, 979 }; 980 981 static const struct btmtkuart_data mt7663_data __maybe_unused = { 982 .flags = BTMTKUART_FLAG_STANDALONE_HW, 983 .fwname = FIRMWARE_MT7663, 984 }; 985 986 static const struct btmtkuart_data mt7668_data __maybe_unused = { 987 .flags = BTMTKUART_FLAG_STANDALONE_HW, 988 .fwname = FIRMWARE_MT7668, 989 }; 990 991 #ifdef CONFIG_OF 992 static const struct of_device_id mtk_of_match_table[] = { 993 { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data}, 994 { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data}, 995 { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data}, 996 { } 997 }; 998 MODULE_DEVICE_TABLE(of, mtk_of_match_table); 999 #endif 1000 1001 static struct serdev_device_driver btmtkuart_driver = { 1002 .probe = btmtkuart_probe, 1003 .remove = btmtkuart_remove, 1004 .driver = { 1005 .name = "btmtkuart", 1006 .of_match_table = of_match_ptr(mtk_of_match_table), 1007 }, 1008 }; 1009 1010 module_serdev_device_driver(btmtkuart_driver); 1011 1012 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); 1013 MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION); 1014 MODULE_VERSION(VERSION); 1015 MODULE_LICENSE("GPL"); 1016