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/of_device.h> 21 #include <linux/pinctrl/consumer.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/regulator/consumer.h> 24 #include <linux/serdev.h> 25 #include <linux/skbuff.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 int 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 err; 380 } 381 382 sz_left -= sz_h4; 383 p_left += sz_h4; 384 } 385 386 return 0; 387 } 388 389 static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data, 390 size_t count) 391 { 392 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 393 int err; 394 395 err = btmtkuart_recv(bdev->hdev, data, count); 396 if (err < 0) 397 return err; 398 399 bdev->hdev->stat.byte_rx += count; 400 401 return count; 402 } 403 404 static void btmtkuart_write_wakeup(struct serdev_device *serdev) 405 { 406 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 407 408 btmtkuart_tx_wakeup(bdev); 409 } 410 411 static const struct serdev_device_ops btmtkuart_client_ops = { 412 .receive_buf = btmtkuart_receive_buf, 413 .write_wakeup = btmtkuart_write_wakeup, 414 }; 415 416 static int btmtkuart_open(struct hci_dev *hdev) 417 { 418 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 419 struct device *dev; 420 int err; 421 422 err = serdev_device_open(bdev->serdev); 423 if (err) { 424 bt_dev_err(hdev, "Unable to open UART device %s", 425 dev_name(&bdev->serdev->dev)); 426 goto err_open; 427 } 428 429 if (btmtkuart_is_standalone(bdev)) { 430 if (bdev->curr_speed != bdev->desired_speed) 431 err = serdev_device_set_baudrate(bdev->serdev, 432 115200); 433 else 434 err = serdev_device_set_baudrate(bdev->serdev, 435 bdev->desired_speed); 436 437 if (err < 0) { 438 bt_dev_err(hdev, "Unable to set baudrate UART device %s", 439 dev_name(&bdev->serdev->dev)); 440 goto err_serdev_close; 441 } 442 443 serdev_device_set_flow_control(bdev->serdev, false); 444 } 445 446 bdev->stp_cursor = 2; 447 bdev->stp_dlen = 0; 448 449 dev = &bdev->serdev->dev; 450 451 /* Enable the power domain and clock the device requires */ 452 pm_runtime_enable(dev); 453 err = pm_runtime_resume_and_get(dev); 454 if (err < 0) 455 goto err_disable_rpm; 456 457 err = clk_prepare_enable(bdev->clk); 458 if (err < 0) 459 goto err_put_rpm; 460 461 return 0; 462 463 err_put_rpm: 464 pm_runtime_put_sync(dev); 465 err_disable_rpm: 466 pm_runtime_disable(dev); 467 err_serdev_close: 468 serdev_device_close(bdev->serdev); 469 err_open: 470 return err; 471 } 472 473 static int btmtkuart_close(struct hci_dev *hdev) 474 { 475 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 476 struct device *dev = &bdev->serdev->dev; 477 478 /* Shutdown the clock and power domain the device requires */ 479 clk_disable_unprepare(bdev->clk); 480 pm_runtime_put_sync(dev); 481 pm_runtime_disable(dev); 482 483 serdev_device_close(bdev->serdev); 484 485 return 0; 486 } 487 488 static int btmtkuart_flush(struct hci_dev *hdev) 489 { 490 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 491 492 /* Flush any pending characters */ 493 serdev_device_write_flush(bdev->serdev); 494 skb_queue_purge(&bdev->txq); 495 496 cancel_work_sync(&bdev->tx_work); 497 498 kfree_skb(bdev->rx_skb); 499 bdev->rx_skb = NULL; 500 501 bdev->stp_cursor = 2; 502 bdev->stp_dlen = 0; 503 504 return 0; 505 } 506 507 static int btmtkuart_func_query(struct hci_dev *hdev) 508 { 509 struct btmtk_hci_wmt_params wmt_params; 510 int status, err; 511 u8 param = 0; 512 513 /* Query whether the function is enabled */ 514 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 515 wmt_params.flag = 4; 516 wmt_params.dlen = sizeof(param); 517 wmt_params.data = ¶m; 518 wmt_params.status = &status; 519 520 err = mtk_hci_wmt_sync(hdev, &wmt_params); 521 if (err < 0) { 522 bt_dev_err(hdev, "Failed to query function status (%d)", err); 523 return err; 524 } 525 526 return status; 527 } 528 529 static int btmtkuart_change_baudrate(struct hci_dev *hdev) 530 { 531 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 532 struct btmtk_hci_wmt_params wmt_params; 533 __le32 baudrate; 534 u8 param; 535 int err; 536 537 /* Indicate the device to enter the probe state the host is 538 * ready to change a new baudrate. 539 */ 540 baudrate = cpu_to_le32(bdev->desired_speed); 541 wmt_params.op = BTMTK_WMT_HIF; 542 wmt_params.flag = 1; 543 wmt_params.dlen = 4; 544 wmt_params.data = &baudrate; 545 wmt_params.status = NULL; 546 547 err = mtk_hci_wmt_sync(hdev, &wmt_params); 548 if (err < 0) { 549 bt_dev_err(hdev, "Failed to device baudrate (%d)", err); 550 return err; 551 } 552 553 err = serdev_device_set_baudrate(bdev->serdev, 554 bdev->desired_speed); 555 if (err < 0) { 556 bt_dev_err(hdev, "Failed to set up host baudrate (%d)", 557 err); 558 return err; 559 } 560 561 serdev_device_set_flow_control(bdev->serdev, false); 562 563 /* Send a dummy byte 0xff to activate the new baudrate */ 564 param = 0xff; 565 err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param)); 566 if (err < 0 || err < sizeof(param)) 567 return err; 568 569 serdev_device_wait_until_sent(bdev->serdev, 0); 570 571 /* Wait some time for the device changing baudrate done */ 572 usleep_range(20000, 22000); 573 574 /* Test the new baudrate */ 575 wmt_params.op = BTMTK_WMT_TEST; 576 wmt_params.flag = 7; 577 wmt_params.dlen = 0; 578 wmt_params.data = NULL; 579 wmt_params.status = NULL; 580 581 err = mtk_hci_wmt_sync(hdev, &wmt_params); 582 if (err < 0) { 583 bt_dev_err(hdev, "Failed to test new baudrate (%d)", 584 err); 585 return err; 586 } 587 588 bdev->curr_speed = bdev->desired_speed; 589 590 return 0; 591 } 592 593 static int btmtkuart_setup(struct hci_dev *hdev) 594 { 595 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 596 struct btmtk_hci_wmt_params wmt_params; 597 ktime_t calltime, delta, rettime; 598 struct btmtk_tci_sleep tci_sleep; 599 unsigned long long duration; 600 struct sk_buff *skb; 601 int err, status; 602 u8 param = 0x1; 603 604 calltime = ktime_get(); 605 606 /* Wakeup MCUSYS is required for certain devices before we start to 607 * do any setups. 608 */ 609 if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) { 610 wmt_params.op = BTMTK_WMT_WAKEUP; 611 wmt_params.flag = 3; 612 wmt_params.dlen = 0; 613 wmt_params.data = NULL; 614 wmt_params.status = NULL; 615 616 err = mtk_hci_wmt_sync(hdev, &wmt_params); 617 if (err < 0) { 618 bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err); 619 return err; 620 } 621 622 clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 623 } 624 625 if (btmtkuart_is_standalone(bdev)) 626 btmtkuart_change_baudrate(hdev); 627 628 /* Query whether the firmware is already download */ 629 wmt_params.op = BTMTK_WMT_SEMAPHORE; 630 wmt_params.flag = 1; 631 wmt_params.dlen = 0; 632 wmt_params.data = NULL; 633 wmt_params.status = &status; 634 635 err = mtk_hci_wmt_sync(hdev, &wmt_params); 636 if (err < 0) { 637 bt_dev_err(hdev, "Failed to query firmware status (%d)", err); 638 return err; 639 } 640 641 if (status == BTMTK_WMT_PATCH_DONE) { 642 bt_dev_info(hdev, "Firmware already downloaded"); 643 goto ignore_setup_fw; 644 } 645 646 /* Setup a firmware which the device definitely requires */ 647 err = btmtk_setup_firmware(hdev, bdev->data->fwname, mtk_hci_wmt_sync); 648 if (err < 0) 649 return err; 650 651 ignore_setup_fw: 652 /* Query whether the device is already enabled */ 653 err = readx_poll_timeout(btmtkuart_func_query, hdev, status, 654 status < 0 || status != BTMTK_WMT_ON_PROGRESS, 655 2000, 5000000); 656 /* -ETIMEDOUT happens */ 657 if (err < 0) 658 return err; 659 660 /* The other errors happen in btusb_mtk_func_query */ 661 if (status < 0) 662 return status; 663 664 if (status == BTMTK_WMT_ON_DONE) { 665 bt_dev_info(hdev, "function already on"); 666 goto ignore_func_on; 667 } 668 669 /* Enable Bluetooth protocol */ 670 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 671 wmt_params.flag = 0; 672 wmt_params.dlen = sizeof(param); 673 wmt_params.data = ¶m; 674 wmt_params.status = NULL; 675 676 err = mtk_hci_wmt_sync(hdev, &wmt_params); 677 if (err < 0) { 678 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 679 return err; 680 } 681 682 ignore_func_on: 683 /* Apply the low power environment setup */ 684 tci_sleep.mode = 0x5; 685 tci_sleep.duration = cpu_to_le16(0x640); 686 tci_sleep.host_duration = cpu_to_le16(0x640); 687 tci_sleep.host_wakeup_pin = 0; 688 tci_sleep.time_compensation = 0; 689 690 skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep, 691 HCI_INIT_TIMEOUT); 692 if (IS_ERR(skb)) { 693 err = PTR_ERR(skb); 694 bt_dev_err(hdev, "Failed to apply low power setting (%d)", err); 695 return err; 696 } 697 kfree_skb(skb); 698 699 rettime = ktime_get(); 700 delta = ktime_sub(rettime, calltime); 701 duration = (unsigned long long)ktime_to_ns(delta) >> 10; 702 703 bt_dev_info(hdev, "Device setup in %llu usecs", duration); 704 705 return 0; 706 } 707 708 static int btmtkuart_shutdown(struct hci_dev *hdev) 709 { 710 struct btmtk_hci_wmt_params wmt_params; 711 u8 param = 0x0; 712 int err; 713 714 /* Disable the device */ 715 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 716 wmt_params.flag = 0; 717 wmt_params.dlen = sizeof(param); 718 wmt_params.data = ¶m; 719 wmt_params.status = NULL; 720 721 err = mtk_hci_wmt_sync(hdev, &wmt_params); 722 if (err < 0) { 723 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 724 return err; 725 } 726 727 return 0; 728 } 729 730 static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 731 { 732 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 733 struct mtk_stp_hdr *shdr; 734 int err, dlen, type = 0; 735 736 /* Prepend skb with frame type */ 737 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 738 739 /* Make sure that there is enough rooms for STP header and trailer */ 740 if (unlikely(skb_headroom(skb) < sizeof(*shdr)) || 741 (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) { 742 err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE, 743 GFP_ATOMIC); 744 if (err < 0) 745 return err; 746 } 747 748 /* Add the STP header */ 749 dlen = skb->len; 750 shdr = skb_push(skb, sizeof(*shdr)); 751 shdr->prefix = 0x80; 752 shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12)); 753 shdr->cs = 0; /* MT7622 doesn't care about checksum value */ 754 755 /* Add the STP trailer */ 756 skb_put_zero(skb, MTK_STP_TLR_SIZE); 757 758 skb_queue_tail(&bdev->txq, skb); 759 760 btmtkuart_tx_wakeup(bdev); 761 return 0; 762 } 763 764 static int btmtkuart_parse_dt(struct serdev_device *serdev) 765 { 766 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 767 struct device_node *node = serdev->dev.of_node; 768 u32 speed = 921600; 769 int err; 770 771 if (btmtkuart_is_standalone(bdev)) { 772 of_property_read_u32(node, "current-speed", &speed); 773 774 bdev->desired_speed = speed; 775 776 bdev->vcc = devm_regulator_get(&serdev->dev, "vcc"); 777 if (IS_ERR(bdev->vcc)) { 778 err = PTR_ERR(bdev->vcc); 779 return err; 780 } 781 782 bdev->osc = devm_clk_get_optional(&serdev->dev, "osc"); 783 if (IS_ERR(bdev->osc)) { 784 err = PTR_ERR(bdev->osc); 785 return err; 786 } 787 788 bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot", 789 GPIOD_OUT_LOW); 790 if (IS_ERR(bdev->boot)) { 791 err = PTR_ERR(bdev->boot); 792 return err; 793 } 794 795 bdev->pinctrl = devm_pinctrl_get(&serdev->dev); 796 if (IS_ERR(bdev->pinctrl)) { 797 err = PTR_ERR(bdev->pinctrl); 798 return err; 799 } 800 801 bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl, 802 "default"); 803 if (IS_ERR(bdev->pins_boot) && !bdev->boot) { 804 err = PTR_ERR(bdev->pins_boot); 805 dev_err(&serdev->dev, 806 "Should assign RXD to LOW at boot stage\n"); 807 return err; 808 } 809 810 bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl, 811 "runtime"); 812 if (IS_ERR(bdev->pins_runtime)) { 813 err = PTR_ERR(bdev->pins_runtime); 814 return err; 815 } 816 817 bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset", 818 GPIOD_OUT_LOW); 819 if (IS_ERR(bdev->reset)) { 820 err = PTR_ERR(bdev->reset); 821 return err; 822 } 823 } else if (btmtkuart_is_builtin_soc(bdev)) { 824 bdev->clk = devm_clk_get(&serdev->dev, "ref"); 825 if (IS_ERR(bdev->clk)) 826 return PTR_ERR(bdev->clk); 827 } 828 829 return 0; 830 } 831 832 static int btmtkuart_probe(struct serdev_device *serdev) 833 { 834 struct btmtkuart_dev *bdev; 835 struct hci_dev *hdev; 836 int err; 837 838 bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL); 839 if (!bdev) 840 return -ENOMEM; 841 842 bdev->data = of_device_get_match_data(&serdev->dev); 843 if (!bdev->data) 844 return -ENODEV; 845 846 bdev->serdev = serdev; 847 serdev_device_set_drvdata(serdev, bdev); 848 849 serdev_device_set_client_ops(serdev, &btmtkuart_client_ops); 850 851 err = btmtkuart_parse_dt(serdev); 852 if (err < 0) 853 return err; 854 855 INIT_WORK(&bdev->tx_work, btmtkuart_tx_work); 856 skb_queue_head_init(&bdev->txq); 857 858 /* Initialize and register HCI device */ 859 hdev = hci_alloc_dev(); 860 if (!hdev) { 861 dev_err(&serdev->dev, "Can't allocate HCI device\n"); 862 return -ENOMEM; 863 } 864 865 bdev->hdev = hdev; 866 867 hdev->bus = HCI_UART; 868 hci_set_drvdata(hdev, bdev); 869 870 hdev->open = btmtkuart_open; 871 hdev->close = btmtkuart_close; 872 hdev->flush = btmtkuart_flush; 873 hdev->setup = btmtkuart_setup; 874 hdev->shutdown = btmtkuart_shutdown; 875 hdev->send = btmtkuart_send_frame; 876 hdev->set_bdaddr = btmtk_set_bdaddr; 877 SET_HCIDEV_DEV(hdev, &serdev->dev); 878 879 hdev->manufacturer = 70; 880 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); 881 882 if (btmtkuart_is_standalone(bdev)) { 883 err = clk_prepare_enable(bdev->osc); 884 if (err < 0) 885 goto err_hci_free_dev; 886 887 if (bdev->boot) { 888 gpiod_set_value_cansleep(bdev->boot, 1); 889 } else { 890 /* Switch to the specific pin state for the booting 891 * requires. 892 */ 893 pinctrl_select_state(bdev->pinctrl, bdev->pins_boot); 894 } 895 896 /* Power on */ 897 err = regulator_enable(bdev->vcc); 898 if (err < 0) 899 goto err_clk_disable_unprepare; 900 901 /* Reset if the reset-gpios is available otherwise the board 902 * -level design should be guaranteed. 903 */ 904 if (bdev->reset) { 905 gpiod_set_value_cansleep(bdev->reset, 1); 906 usleep_range(1000, 2000); 907 gpiod_set_value_cansleep(bdev->reset, 0); 908 } 909 910 /* Wait some time until device got ready and switch to the pin 911 * mode the device requires for UART transfers. 912 */ 913 msleep(50); 914 915 if (bdev->boot) 916 devm_gpiod_put(&serdev->dev, bdev->boot); 917 918 pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime); 919 920 /* A standalone device doesn't depends on power domain on SoC, 921 * so mark it as no callbacks. 922 */ 923 pm_runtime_no_callbacks(&serdev->dev); 924 925 set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 926 } 927 928 err = hci_register_dev(hdev); 929 if (err < 0) { 930 dev_err(&serdev->dev, "Can't register HCI device\n"); 931 goto err_regulator_disable; 932 } 933 934 return 0; 935 936 err_regulator_disable: 937 if (btmtkuart_is_standalone(bdev)) 938 regulator_disable(bdev->vcc); 939 err_clk_disable_unprepare: 940 if (btmtkuart_is_standalone(bdev)) 941 clk_disable_unprepare(bdev->osc); 942 err_hci_free_dev: 943 hci_free_dev(hdev); 944 945 return err; 946 } 947 948 static void btmtkuart_remove(struct serdev_device *serdev) 949 { 950 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 951 struct hci_dev *hdev = bdev->hdev; 952 953 if (btmtkuart_is_standalone(bdev)) { 954 regulator_disable(bdev->vcc); 955 clk_disable_unprepare(bdev->osc); 956 } 957 958 hci_unregister_dev(hdev); 959 hci_free_dev(hdev); 960 } 961 962 static const struct btmtkuart_data mt7622_data = { 963 .fwname = FIRMWARE_MT7622, 964 }; 965 966 static const struct btmtkuart_data mt7663_data = { 967 .flags = BTMTKUART_FLAG_STANDALONE_HW, 968 .fwname = FIRMWARE_MT7663, 969 }; 970 971 static const struct btmtkuart_data mt7668_data = { 972 .flags = BTMTKUART_FLAG_STANDALONE_HW, 973 .fwname = FIRMWARE_MT7668, 974 }; 975 976 #ifdef CONFIG_OF 977 static const struct of_device_id mtk_of_match_table[] = { 978 { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data}, 979 { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data}, 980 { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data}, 981 { } 982 }; 983 MODULE_DEVICE_TABLE(of, mtk_of_match_table); 984 #endif 985 986 static struct serdev_device_driver btmtkuart_driver = { 987 .probe = btmtkuart_probe, 988 .remove = btmtkuart_remove, 989 .driver = { 990 .name = "btmtkuart", 991 .of_match_table = of_match_ptr(mtk_of_match_table), 992 }, 993 }; 994 995 module_serdev_device_driver(btmtkuart_driver); 996 997 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); 998 MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION); 999 MODULE_VERSION(VERSION); 1000 MODULE_LICENSE("GPL"); 1001