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 #include <linux/usb.h> 26 27 #include <net/bluetooth/bluetooth.h> 28 #include <net/bluetooth/hci_core.h> 29 30 #include "h4_recv.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 }; 83 84 #define btmtkuart_is_standalone(bdev) \ 85 ((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW) 86 #define btmtkuart_is_builtin_soc(bdev) \ 87 !((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW) 88 89 static int mtk_hci_wmt_sync(struct hci_dev *hdev, 90 struct btmtk_hci_wmt_params *wmt_params) 91 { 92 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 93 struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc; 94 u32 hlen, status = BTMTK_WMT_INVALID; 95 struct btmtk_hci_wmt_evt *wmt_evt; 96 struct btmtk_hci_wmt_cmd *wc; 97 struct btmtk_wmt_hdr *hdr; 98 int err; 99 100 /* Send the WMT command and wait until the WMT event returns */ 101 hlen = sizeof(*hdr) + wmt_params->dlen; 102 if (hlen > 255) { 103 err = -EINVAL; 104 goto err_free_skb; 105 } 106 107 wc = kzalloc(hlen, GFP_KERNEL); 108 if (!wc) { 109 err = -ENOMEM; 110 goto err_free_skb; 111 } 112 113 hdr = &wc->hdr; 114 hdr->dir = 1; 115 hdr->op = wmt_params->op; 116 hdr->dlen = cpu_to_le16(wmt_params->dlen + 1); 117 hdr->flag = wmt_params->flag; 118 memcpy(wc->data, wmt_params->data, wmt_params->dlen); 119 120 set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 121 122 err = __hci_cmd_send(hdev, 0xfc6f, hlen, wc); 123 if (err < 0) { 124 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 125 goto err_free_wc; 126 } 127 128 /* The vendor specific WMT commands are all answered by a vendor 129 * specific event and will not have the Command Status or Command 130 * Complete as with usual HCI command flow control. 131 * 132 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT 133 * state to be cleared. The driver specific event receive routine 134 * will clear that state and with that indicate completion of the 135 * WMT command. 136 */ 137 err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT, 138 TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT); 139 if (err == -EINTR) { 140 bt_dev_err(hdev, "Execution of wmt command interrupted"); 141 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 142 goto err_free_wc; 143 } 144 145 if (err) { 146 bt_dev_err(hdev, "Execution of wmt command timed out"); 147 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state); 148 err = -ETIMEDOUT; 149 goto err_free_wc; 150 } 151 152 /* Parse and handle the return WMT event */ 153 wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data; 154 if (wmt_evt->whdr.op != hdr->op) { 155 bt_dev_err(hdev, "Wrong op received %d expected %d", 156 wmt_evt->whdr.op, hdr->op); 157 err = -EIO; 158 goto err_free_wc; 159 } 160 161 switch (wmt_evt->whdr.op) { 162 case BTMTK_WMT_SEMAPHORE: 163 if (wmt_evt->whdr.flag == 2) 164 status = BTMTK_WMT_PATCH_UNDONE; 165 else 166 status = BTMTK_WMT_PATCH_DONE; 167 break; 168 case BTMTK_WMT_FUNC_CTRL: 169 wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt; 170 if (be16_to_cpu(wmt_evt_funcc->status) == 0x404) 171 status = BTMTK_WMT_ON_DONE; 172 else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420) 173 status = BTMTK_WMT_ON_PROGRESS; 174 else 175 status = BTMTK_WMT_ON_UNDONE; 176 break; 177 } 178 179 if (wmt_params->status) 180 *wmt_params->status = status; 181 182 err_free_wc: 183 kfree(wc); 184 err_free_skb: 185 kfree_skb(bdev->evt_skb); 186 bdev->evt_skb = NULL; 187 188 return err; 189 } 190 191 static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb) 192 { 193 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 194 struct hci_event_hdr *hdr = (void *)skb->data; 195 int err; 196 197 /* When someone waits for the WMT event, the skb is being cloned 198 * and being processed the events from there then. 199 */ 200 if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) { 201 bdev->evt_skb = skb_clone(skb, GFP_KERNEL); 202 if (!bdev->evt_skb) { 203 err = -ENOMEM; 204 goto err_out; 205 } 206 } 207 208 err = hci_recv_frame(hdev, skb); 209 if (err < 0) 210 goto err_free_skb; 211 212 if (hdr->evt == HCI_EV_WMT) { 213 if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT, 214 &bdev->tx_state)) { 215 /* Barrier to sync with other CPUs */ 216 smp_mb__after_atomic(); 217 wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT); 218 } 219 } 220 221 return 0; 222 223 err_free_skb: 224 kfree_skb(bdev->evt_skb); 225 bdev->evt_skb = NULL; 226 227 err_out: 228 return err; 229 } 230 231 static const struct h4_recv_pkt mtk_recv_pkts[] = { 232 { H4_RECV_ACL, .recv = hci_recv_frame }, 233 { H4_RECV_SCO, .recv = hci_recv_frame }, 234 { H4_RECV_EVENT, .recv = btmtkuart_recv_event }, 235 }; 236 237 static void btmtkuart_tx_work(struct work_struct *work) 238 { 239 struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev, 240 tx_work); 241 struct serdev_device *serdev = bdev->serdev; 242 struct hci_dev *hdev = bdev->hdev; 243 244 while (1) { 245 clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state); 246 247 while (1) { 248 struct sk_buff *skb = skb_dequeue(&bdev->txq); 249 int len; 250 251 if (!skb) 252 break; 253 254 len = serdev_device_write_buf(serdev, skb->data, 255 skb->len); 256 hdev->stat.byte_tx += len; 257 258 skb_pull(skb, len); 259 if (skb->len > 0) { 260 skb_queue_head(&bdev->txq, skb); 261 break; 262 } 263 264 switch (hci_skb_pkt_type(skb)) { 265 case HCI_COMMAND_PKT: 266 hdev->stat.cmd_tx++; 267 break; 268 case HCI_ACLDATA_PKT: 269 hdev->stat.acl_tx++; 270 break; 271 case HCI_SCODATA_PKT: 272 hdev->stat.sco_tx++; 273 break; 274 } 275 276 kfree_skb(skb); 277 } 278 279 if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state)) 280 break; 281 } 282 283 clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state); 284 } 285 286 static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev) 287 { 288 if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state)) 289 set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state); 290 291 schedule_work(&bdev->tx_work); 292 } 293 294 static const unsigned char * 295 mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count, 296 int *sz_h4) 297 { 298 struct mtk_stp_hdr *shdr; 299 300 /* The cursor is reset when all the data of STP is consumed out */ 301 if (!bdev->stp_dlen && bdev->stp_cursor >= 6) 302 bdev->stp_cursor = 0; 303 304 /* Filling pad until all STP info is obtained */ 305 while (bdev->stp_cursor < 6 && count > 0) { 306 bdev->stp_pad[bdev->stp_cursor] = *data; 307 bdev->stp_cursor++; 308 data++; 309 count--; 310 } 311 312 /* Retrieve STP info and have a sanity check */ 313 if (!bdev->stp_dlen && bdev->stp_cursor >= 6) { 314 shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2]; 315 bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff; 316 317 /* Resync STP when unexpected data is being read */ 318 if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) { 319 bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)", 320 shdr->prefix, bdev->stp_dlen); 321 bdev->stp_cursor = 2; 322 bdev->stp_dlen = 0; 323 } 324 } 325 326 /* Directly quit when there's no data found for H4 can process */ 327 if (count <= 0) 328 return NULL; 329 330 /* Tranlate to how much the size of data H4 can handle so far */ 331 *sz_h4 = min_t(int, count, bdev->stp_dlen); 332 333 /* Update the remaining size of STP packet */ 334 bdev->stp_dlen -= *sz_h4; 335 336 /* Data points to STP payload which can be handled by H4 */ 337 return data; 338 } 339 340 static void btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count) 341 { 342 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 343 const unsigned char *p_left = data, *p_h4; 344 int sz_left = count, sz_h4, adv; 345 int err; 346 347 while (sz_left > 0) { 348 /* The serial data received from MT7622 BT controller is 349 * at all time padded around with the STP header and tailer. 350 * 351 * A full STP packet is looking like 352 * ----------------------------------- 353 * | STP header | H:4 | STP tailer | 354 * ----------------------------------- 355 * but it doesn't guarantee to contain a full H:4 packet which 356 * means that it's possible for multiple STP packets forms a 357 * full H:4 packet that means extra STP header + length doesn't 358 * indicate a full H:4 frame, things can fragment. Whose length 359 * recorded in STP header just shows up the most length the 360 * H:4 engine can handle currently. 361 */ 362 363 p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4); 364 if (!p_h4) 365 break; 366 367 adv = p_h4 - p_left; 368 sz_left -= adv; 369 p_left += adv; 370 371 bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4, 372 sz_h4, mtk_recv_pkts, 373 ARRAY_SIZE(mtk_recv_pkts)); 374 if (IS_ERR(bdev->rx_skb)) { 375 err = PTR_ERR(bdev->rx_skb); 376 bt_dev_err(bdev->hdev, 377 "Frame reassembly failed (%d)", err); 378 bdev->rx_skb = NULL; 379 return; 380 } 381 382 sz_left -= sz_h4; 383 p_left += sz_h4; 384 } 385 } 386 387 static size_t btmtkuart_receive_buf(struct serdev_device *serdev, 388 const u8 *data, size_t count) 389 { 390 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 391 392 btmtkuart_recv(bdev->hdev, data, count); 393 394 bdev->hdev->stat.byte_rx += count; 395 396 return count; 397 } 398 399 static void btmtkuart_write_wakeup(struct serdev_device *serdev) 400 { 401 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 402 403 btmtkuart_tx_wakeup(bdev); 404 } 405 406 static const struct serdev_device_ops btmtkuart_client_ops = { 407 .receive_buf = btmtkuart_receive_buf, 408 .write_wakeup = btmtkuart_write_wakeup, 409 }; 410 411 static int btmtkuart_open(struct hci_dev *hdev) 412 { 413 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 414 struct device *dev; 415 int err; 416 417 err = serdev_device_open(bdev->serdev); 418 if (err) { 419 bt_dev_err(hdev, "Unable to open UART device %s", 420 dev_name(&bdev->serdev->dev)); 421 goto err_open; 422 } 423 424 if (btmtkuart_is_standalone(bdev)) { 425 if (bdev->curr_speed != bdev->desired_speed) 426 err = serdev_device_set_baudrate(bdev->serdev, 427 115200); 428 else 429 err = serdev_device_set_baudrate(bdev->serdev, 430 bdev->desired_speed); 431 432 if (err < 0) { 433 bt_dev_err(hdev, "Unable to set baudrate UART device %s", 434 dev_name(&bdev->serdev->dev)); 435 goto err_serdev_close; 436 } 437 438 serdev_device_set_flow_control(bdev->serdev, false); 439 } 440 441 bdev->stp_cursor = 2; 442 bdev->stp_dlen = 0; 443 444 dev = &bdev->serdev->dev; 445 446 /* Enable the power domain and clock the device requires */ 447 pm_runtime_enable(dev); 448 err = pm_runtime_resume_and_get(dev); 449 if (err < 0) 450 goto err_disable_rpm; 451 452 err = clk_prepare_enable(bdev->clk); 453 if (err < 0) 454 goto err_put_rpm; 455 456 return 0; 457 458 err_put_rpm: 459 pm_runtime_put_sync(dev); 460 err_disable_rpm: 461 pm_runtime_disable(dev); 462 err_serdev_close: 463 serdev_device_close(bdev->serdev); 464 err_open: 465 return err; 466 } 467 468 static int btmtkuart_close(struct hci_dev *hdev) 469 { 470 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 471 struct device *dev = &bdev->serdev->dev; 472 473 /* Shutdown the clock and power domain the device requires */ 474 clk_disable_unprepare(bdev->clk); 475 pm_runtime_put_sync(dev); 476 pm_runtime_disable(dev); 477 478 serdev_device_close(bdev->serdev); 479 480 return 0; 481 } 482 483 static int btmtkuart_flush(struct hci_dev *hdev) 484 { 485 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 486 487 /* Flush any pending characters */ 488 serdev_device_write_flush(bdev->serdev); 489 skb_queue_purge(&bdev->txq); 490 491 cancel_work_sync(&bdev->tx_work); 492 493 kfree_skb(bdev->rx_skb); 494 bdev->rx_skb = NULL; 495 496 bdev->stp_cursor = 2; 497 bdev->stp_dlen = 0; 498 499 return 0; 500 } 501 502 static int btmtkuart_func_query(struct hci_dev *hdev) 503 { 504 struct btmtk_hci_wmt_params wmt_params; 505 int status, err; 506 u8 param = 0; 507 508 /* Query whether the function is enabled */ 509 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 510 wmt_params.flag = 4; 511 wmt_params.dlen = sizeof(param); 512 wmt_params.data = ¶m; 513 wmt_params.status = &status; 514 515 err = mtk_hci_wmt_sync(hdev, &wmt_params); 516 if (err < 0) { 517 bt_dev_err(hdev, "Failed to query function status (%d)", err); 518 return err; 519 } 520 521 return status; 522 } 523 524 static int btmtkuart_change_baudrate(struct hci_dev *hdev) 525 { 526 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 527 struct btmtk_hci_wmt_params wmt_params; 528 __le32 baudrate; 529 u8 param; 530 int err; 531 532 /* Indicate the device to enter the probe state the host is 533 * ready to change a new baudrate. 534 */ 535 baudrate = cpu_to_le32(bdev->desired_speed); 536 wmt_params.op = BTMTK_WMT_HIF; 537 wmt_params.flag = 1; 538 wmt_params.dlen = 4; 539 wmt_params.data = &baudrate; 540 wmt_params.status = NULL; 541 542 err = mtk_hci_wmt_sync(hdev, &wmt_params); 543 if (err < 0) { 544 bt_dev_err(hdev, "Failed to device baudrate (%d)", err); 545 return err; 546 } 547 548 err = serdev_device_set_baudrate(bdev->serdev, 549 bdev->desired_speed); 550 if (err < 0) { 551 bt_dev_err(hdev, "Failed to set up host baudrate (%d)", 552 err); 553 return err; 554 } 555 556 serdev_device_set_flow_control(bdev->serdev, false); 557 558 /* Send a dummy byte 0xff to activate the new baudrate */ 559 param = 0xff; 560 err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param)); 561 if (err < 0 || err < sizeof(param)) 562 return err; 563 564 serdev_device_wait_until_sent(bdev->serdev, 0); 565 566 /* Wait some time for the device changing baudrate done */ 567 usleep_range(20000, 22000); 568 569 /* Test the new baudrate */ 570 wmt_params.op = BTMTK_WMT_TEST; 571 wmt_params.flag = 7; 572 wmt_params.dlen = 0; 573 wmt_params.data = NULL; 574 wmt_params.status = NULL; 575 576 err = mtk_hci_wmt_sync(hdev, &wmt_params); 577 if (err < 0) { 578 bt_dev_err(hdev, "Failed to test new baudrate (%d)", 579 err); 580 return err; 581 } 582 583 bdev->curr_speed = bdev->desired_speed; 584 585 return 0; 586 } 587 588 static int btmtkuart_setup(struct hci_dev *hdev) 589 { 590 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 591 struct btmtk_hci_wmt_params wmt_params; 592 ktime_t calltime, delta, rettime; 593 struct btmtk_tci_sleep tci_sleep; 594 unsigned long long duration; 595 struct sk_buff *skb; 596 int err, status; 597 u8 param = 0x1; 598 599 calltime = ktime_get(); 600 601 /* Wakeup MCUSYS is required for certain devices before we start to 602 * do any setups. 603 */ 604 if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) { 605 wmt_params.op = BTMTK_WMT_WAKEUP; 606 wmt_params.flag = 3; 607 wmt_params.dlen = 0; 608 wmt_params.data = NULL; 609 wmt_params.status = NULL; 610 611 err = mtk_hci_wmt_sync(hdev, &wmt_params); 612 if (err < 0) { 613 bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err); 614 return err; 615 } 616 617 clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 618 } 619 620 if (btmtkuart_is_standalone(bdev)) 621 btmtkuart_change_baudrate(hdev); 622 623 /* Query whether the firmware is already download */ 624 wmt_params.op = BTMTK_WMT_SEMAPHORE; 625 wmt_params.flag = 1; 626 wmt_params.dlen = 0; 627 wmt_params.data = NULL; 628 wmt_params.status = &status; 629 630 err = mtk_hci_wmt_sync(hdev, &wmt_params); 631 if (err < 0) { 632 bt_dev_err(hdev, "Failed to query firmware status (%d)", err); 633 return err; 634 } 635 636 if (status == BTMTK_WMT_PATCH_DONE) { 637 bt_dev_info(hdev, "Firmware already downloaded"); 638 goto ignore_setup_fw; 639 } 640 641 /* Setup a firmware which the device definitely requires */ 642 err = btmtk_setup_firmware(hdev, bdev->data->fwname, mtk_hci_wmt_sync); 643 if (err < 0) 644 return err; 645 646 ignore_setup_fw: 647 /* Query whether the device is already enabled */ 648 err = readx_poll_timeout(btmtkuart_func_query, hdev, status, 649 status < 0 || status != BTMTK_WMT_ON_PROGRESS, 650 2000, 5000000); 651 /* -ETIMEDOUT happens */ 652 if (err < 0) 653 return err; 654 655 /* The other errors happen in btusb_mtk_func_query */ 656 if (status < 0) 657 return status; 658 659 if (status == BTMTK_WMT_ON_DONE) { 660 bt_dev_info(hdev, "function already on"); 661 goto ignore_func_on; 662 } 663 664 /* Enable Bluetooth protocol */ 665 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 666 wmt_params.flag = 0; 667 wmt_params.dlen = sizeof(param); 668 wmt_params.data = ¶m; 669 wmt_params.status = NULL; 670 671 err = mtk_hci_wmt_sync(hdev, &wmt_params); 672 if (err < 0) { 673 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 674 return err; 675 } 676 677 ignore_func_on: 678 /* Apply the low power environment setup */ 679 tci_sleep.mode = 0x5; 680 tci_sleep.duration = cpu_to_le16(0x640); 681 tci_sleep.host_duration = cpu_to_le16(0x640); 682 tci_sleep.host_wakeup_pin = 0; 683 tci_sleep.time_compensation = 0; 684 685 skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep, 686 HCI_INIT_TIMEOUT); 687 if (IS_ERR(skb)) { 688 err = PTR_ERR(skb); 689 bt_dev_err(hdev, "Failed to apply low power setting (%d)", err); 690 return err; 691 } 692 kfree_skb(skb); 693 694 rettime = ktime_get(); 695 delta = ktime_sub(rettime, calltime); 696 duration = (unsigned long long)ktime_to_ns(delta) >> 10; 697 698 bt_dev_info(hdev, "Device setup in %llu usecs", duration); 699 700 return 0; 701 } 702 703 static int btmtkuart_shutdown(struct hci_dev *hdev) 704 { 705 struct btmtk_hci_wmt_params wmt_params; 706 u8 param = 0x0; 707 int err; 708 709 /* Disable the device */ 710 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 711 wmt_params.flag = 0; 712 wmt_params.dlen = sizeof(param); 713 wmt_params.data = ¶m; 714 wmt_params.status = NULL; 715 716 err = mtk_hci_wmt_sync(hdev, &wmt_params); 717 if (err < 0) { 718 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 719 return err; 720 } 721 722 return 0; 723 } 724 725 static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 726 { 727 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 728 struct mtk_stp_hdr *shdr; 729 int err, dlen, type = 0; 730 731 /* Prepend skb with frame type */ 732 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 733 734 /* Make sure that there is enough rooms for STP header and trailer */ 735 if (unlikely(skb_headroom(skb) < sizeof(*shdr)) || 736 (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) { 737 err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE, 738 GFP_ATOMIC); 739 if (err < 0) 740 return err; 741 } 742 743 /* Add the STP header */ 744 dlen = skb->len; 745 shdr = skb_push(skb, sizeof(*shdr)); 746 shdr->prefix = 0x80; 747 shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12)); 748 shdr->cs = 0; /* MT7622 doesn't care about checksum value */ 749 750 /* Add the STP trailer */ 751 skb_put_zero(skb, MTK_STP_TLR_SIZE); 752 753 skb_queue_tail(&bdev->txq, skb); 754 755 btmtkuart_tx_wakeup(bdev); 756 return 0; 757 } 758 759 static int btmtkuart_parse_dt(struct serdev_device *serdev) 760 { 761 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 762 struct device_node *node = serdev->dev.of_node; 763 u32 speed = 921600; 764 int err; 765 766 if (btmtkuart_is_standalone(bdev)) { 767 of_property_read_u32(node, "current-speed", &speed); 768 769 bdev->desired_speed = speed; 770 771 bdev->vcc = devm_regulator_get(&serdev->dev, "vcc"); 772 if (IS_ERR(bdev->vcc)) { 773 err = PTR_ERR(bdev->vcc); 774 return err; 775 } 776 777 bdev->osc = devm_clk_get_optional(&serdev->dev, "osc"); 778 if (IS_ERR(bdev->osc)) { 779 err = PTR_ERR(bdev->osc); 780 return err; 781 } 782 783 bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot", 784 GPIOD_OUT_LOW); 785 if (IS_ERR(bdev->boot)) { 786 err = PTR_ERR(bdev->boot); 787 return err; 788 } 789 790 bdev->pinctrl = devm_pinctrl_get(&serdev->dev); 791 if (IS_ERR(bdev->pinctrl)) { 792 err = PTR_ERR(bdev->pinctrl); 793 return err; 794 } 795 796 bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl, 797 "default"); 798 if (IS_ERR(bdev->pins_boot) && !bdev->boot) { 799 err = PTR_ERR(bdev->pins_boot); 800 dev_err(&serdev->dev, 801 "Should assign RXD to LOW at boot stage\n"); 802 return err; 803 } 804 805 bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl, 806 "runtime"); 807 if (IS_ERR(bdev->pins_runtime)) { 808 err = PTR_ERR(bdev->pins_runtime); 809 return err; 810 } 811 812 bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset", 813 GPIOD_OUT_LOW); 814 if (IS_ERR(bdev->reset)) { 815 err = PTR_ERR(bdev->reset); 816 return err; 817 } 818 } else if (btmtkuart_is_builtin_soc(bdev)) { 819 bdev->clk = devm_clk_get(&serdev->dev, "ref"); 820 if (IS_ERR(bdev->clk)) 821 return PTR_ERR(bdev->clk); 822 } 823 824 return 0; 825 } 826 827 static int btmtkuart_probe(struct serdev_device *serdev) 828 { 829 struct btmtkuart_dev *bdev; 830 struct hci_dev *hdev; 831 int err; 832 833 bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL); 834 if (!bdev) 835 return -ENOMEM; 836 837 bdev->data = of_device_get_match_data(&serdev->dev); 838 if (!bdev->data) 839 return -ENODEV; 840 841 bdev->serdev = serdev; 842 serdev_device_set_drvdata(serdev, bdev); 843 844 serdev_device_set_client_ops(serdev, &btmtkuart_client_ops); 845 846 err = btmtkuart_parse_dt(serdev); 847 if (err < 0) 848 return err; 849 850 INIT_WORK(&bdev->tx_work, btmtkuart_tx_work); 851 skb_queue_head_init(&bdev->txq); 852 853 /* Initialize and register HCI device */ 854 hdev = hci_alloc_dev(); 855 if (!hdev) { 856 dev_err(&serdev->dev, "Can't allocate HCI device\n"); 857 return -ENOMEM; 858 } 859 860 bdev->hdev = hdev; 861 862 hdev->bus = HCI_UART; 863 hci_set_drvdata(hdev, bdev); 864 865 hdev->open = btmtkuart_open; 866 hdev->close = btmtkuart_close; 867 hdev->flush = btmtkuart_flush; 868 hdev->setup = btmtkuart_setup; 869 hdev->shutdown = btmtkuart_shutdown; 870 hdev->send = btmtkuart_send_frame; 871 hdev->set_bdaddr = btmtk_set_bdaddr; 872 SET_HCIDEV_DEV(hdev, &serdev->dev); 873 874 hdev->manufacturer = 70; 875 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); 876 877 if (btmtkuart_is_standalone(bdev)) { 878 err = clk_prepare_enable(bdev->osc); 879 if (err < 0) 880 goto err_hci_free_dev; 881 882 if (bdev->boot) { 883 gpiod_set_value_cansleep(bdev->boot, 1); 884 } else { 885 /* Switch to the specific pin state for the booting 886 * requires. 887 */ 888 pinctrl_select_state(bdev->pinctrl, bdev->pins_boot); 889 } 890 891 /* Power on */ 892 err = regulator_enable(bdev->vcc); 893 if (err < 0) 894 goto err_clk_disable_unprepare; 895 896 /* Reset if the reset-gpios is available otherwise the board 897 * -level design should be guaranteed. 898 */ 899 if (bdev->reset) { 900 gpiod_set_value_cansleep(bdev->reset, 1); 901 usleep_range(1000, 2000); 902 gpiod_set_value_cansleep(bdev->reset, 0); 903 } 904 905 /* Wait some time until device got ready and switch to the pin 906 * mode the device requires for UART transfers. 907 */ 908 msleep(50); 909 910 if (bdev->boot) 911 devm_gpiod_put(&serdev->dev, bdev->boot); 912 913 pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime); 914 915 /* A standalone device doesn't depends on power domain on SoC, 916 * so mark it as no callbacks. 917 */ 918 pm_runtime_no_callbacks(&serdev->dev); 919 920 set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 921 } 922 923 err = hci_register_dev(hdev); 924 if (err < 0) { 925 dev_err(&serdev->dev, "Can't register HCI device\n"); 926 goto err_regulator_disable; 927 } 928 929 return 0; 930 931 err_regulator_disable: 932 if (btmtkuart_is_standalone(bdev)) 933 regulator_disable(bdev->vcc); 934 err_clk_disable_unprepare: 935 if (btmtkuart_is_standalone(bdev)) 936 clk_disable_unprepare(bdev->osc); 937 err_hci_free_dev: 938 hci_free_dev(hdev); 939 940 return err; 941 } 942 943 static void btmtkuart_remove(struct serdev_device *serdev) 944 { 945 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 946 struct hci_dev *hdev = bdev->hdev; 947 948 if (btmtkuart_is_standalone(bdev)) { 949 regulator_disable(bdev->vcc); 950 clk_disable_unprepare(bdev->osc); 951 } 952 953 hci_unregister_dev(hdev); 954 hci_free_dev(hdev); 955 } 956 957 static const struct btmtkuart_data mt7622_data __maybe_unused = { 958 .fwname = FIRMWARE_MT7622, 959 }; 960 961 static const struct btmtkuart_data mt7663_data __maybe_unused = { 962 .flags = BTMTKUART_FLAG_STANDALONE_HW, 963 .fwname = FIRMWARE_MT7663, 964 }; 965 966 static const struct btmtkuart_data mt7668_data __maybe_unused = { 967 .flags = BTMTKUART_FLAG_STANDALONE_HW, 968 .fwname = FIRMWARE_MT7668, 969 }; 970 971 #ifdef CONFIG_OF 972 static const struct of_device_id mtk_of_match_table[] = { 973 { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data}, 974 { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data}, 975 { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data}, 976 { } 977 }; 978 MODULE_DEVICE_TABLE(of, mtk_of_match_table); 979 #endif 980 981 static struct serdev_device_driver btmtkuart_driver = { 982 .probe = btmtkuart_probe, 983 .remove = btmtkuart_remove, 984 .driver = { 985 .name = "btmtkuart", 986 .of_match_table = of_match_ptr(mtk_of_match_table), 987 }, 988 }; 989 990 module_serdev_device_driver(btmtkuart_driver); 991 992 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); 993 MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION); 994 MODULE_VERSION(VERSION); 995 MODULE_LICENSE("GPL"); 996