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 43 struct mtk_stp_hdr { 44 u8 prefix; 45 __be16 dlen; 46 u8 cs; 47 } __packed; 48 49 struct btmtkuart_data { 50 unsigned int flags; 51 const char *fwname; 52 }; 53 54 struct 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 88 static 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; 180 181 err_free_wc: 182 kfree(wc); 183 err_free_skb: 184 kfree_skb(bdev->evt_skb); 185 bdev->evt_skb = NULL; 186 187 return err; 188 } 189 190 static 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; 221 222 err_free_skb: 223 kfree_skb(bdev->evt_skb); 224 bdev->evt_skb = NULL; 225 226 err_out: 227 return err; 228 } 229 230 static 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 }; 235 236 static 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 } 284 285 static 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 } 292 293 static const unsigned char * 294 mtk_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 } 338 339 static int 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 err; 379 } 380 381 sz_left -= sz_h4; 382 p_left += sz_h4; 383 } 384 385 return 0; 386 } 387 388 static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data, 389 size_t count) 390 { 391 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 392 int err; 393 394 err = btmtkuart_recv(bdev->hdev, data, count); 395 if (err < 0) 396 return err; 397 398 bdev->hdev->stat.byte_rx += count; 399 400 return count; 401 } 402 403 static void btmtkuart_write_wakeup(struct serdev_device *serdev) 404 { 405 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 406 407 btmtkuart_tx_wakeup(bdev); 408 } 409 410 static const struct serdev_device_ops btmtkuart_client_ops = { 411 .receive_buf = btmtkuart_receive_buf, 412 .write_wakeup = btmtkuart_write_wakeup, 413 }; 414 415 static int btmtkuart_open(struct hci_dev *hdev) 416 { 417 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 418 struct device *dev; 419 int err; 420 421 err = serdev_device_open(bdev->serdev); 422 if (err) { 423 bt_dev_err(hdev, "Unable to open UART device %s", 424 dev_name(&bdev->serdev->dev)); 425 goto err_open; 426 } 427 428 if (btmtkuart_is_standalone(bdev)) { 429 if (bdev->curr_speed != bdev->desired_speed) 430 err = serdev_device_set_baudrate(bdev->serdev, 431 115200); 432 else 433 err = serdev_device_set_baudrate(bdev->serdev, 434 bdev->desired_speed); 435 436 if (err < 0) { 437 bt_dev_err(hdev, "Unable to set baudrate UART device %s", 438 dev_name(&bdev->serdev->dev)); 439 goto err_serdev_close; 440 } 441 442 serdev_device_set_flow_control(bdev->serdev, false); 443 } 444 445 bdev->stp_cursor = 2; 446 bdev->stp_dlen = 0; 447 448 dev = &bdev->serdev->dev; 449 450 /* Enable the power domain and clock the device requires */ 451 pm_runtime_enable(dev); 452 err = pm_runtime_resume_and_get(dev); 453 if (err < 0) 454 goto err_disable_rpm; 455 456 err = clk_prepare_enable(bdev->clk); 457 if (err < 0) 458 goto err_put_rpm; 459 460 return 0; 461 462 err_put_rpm: 463 pm_runtime_put_sync(dev); 464 err_disable_rpm: 465 pm_runtime_disable(dev); 466 err_serdev_close: 467 serdev_device_close(bdev->serdev); 468 err_open: 469 return err; 470 } 471 472 static int btmtkuart_close(struct hci_dev *hdev) 473 { 474 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 475 struct device *dev = &bdev->serdev->dev; 476 477 /* Shutdown the clock and power domain the device requires */ 478 clk_disable_unprepare(bdev->clk); 479 pm_runtime_put_sync(dev); 480 pm_runtime_disable(dev); 481 482 serdev_device_close(bdev->serdev); 483 484 return 0; 485 } 486 487 static int btmtkuart_flush(struct hci_dev *hdev) 488 { 489 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 490 491 /* Flush any pending characters */ 492 serdev_device_write_flush(bdev->serdev); 493 skb_queue_purge(&bdev->txq); 494 495 cancel_work_sync(&bdev->tx_work); 496 497 kfree_skb(bdev->rx_skb); 498 bdev->rx_skb = NULL; 499 500 bdev->stp_cursor = 2; 501 bdev->stp_dlen = 0; 502 503 return 0; 504 } 505 506 static int btmtkuart_func_query(struct hci_dev *hdev) 507 { 508 struct btmtk_hci_wmt_params wmt_params; 509 int status, err; 510 u8 param = 0; 511 512 /* Query whether the function is enabled */ 513 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 514 wmt_params.flag = 4; 515 wmt_params.dlen = sizeof(param); 516 wmt_params.data = ¶m; 517 wmt_params.status = &status; 518 519 err = mtk_hci_wmt_sync(hdev, &wmt_params); 520 if (err < 0) { 521 bt_dev_err(hdev, "Failed to query function status (%d)", err); 522 return err; 523 } 524 525 return status; 526 } 527 528 static int btmtkuart_change_baudrate(struct hci_dev *hdev) 529 { 530 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 531 struct btmtk_hci_wmt_params wmt_params; 532 __le32 baudrate; 533 u8 param; 534 int err; 535 536 /* Indicate the device to enter the probe state the host is 537 * ready to change a new baudrate. 538 */ 539 baudrate = cpu_to_le32(bdev->desired_speed); 540 wmt_params.op = BTMTK_WMT_HIF; 541 wmt_params.flag = 1; 542 wmt_params.dlen = 4; 543 wmt_params.data = &baudrate; 544 wmt_params.status = NULL; 545 546 err = mtk_hci_wmt_sync(hdev, &wmt_params); 547 if (err < 0) { 548 bt_dev_err(hdev, "Failed to device baudrate (%d)", err); 549 return err; 550 } 551 552 err = serdev_device_set_baudrate(bdev->serdev, 553 bdev->desired_speed); 554 if (err < 0) { 555 bt_dev_err(hdev, "Failed to set up host baudrate (%d)", 556 err); 557 return err; 558 } 559 560 serdev_device_set_flow_control(bdev->serdev, false); 561 562 /* Send a dummy byte 0xff to activate the new baudrate */ 563 param = 0xff; 564 err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param)); 565 if (err < 0 || err < sizeof(param)) 566 return err; 567 568 serdev_device_wait_until_sent(bdev->serdev, 0); 569 570 /* Wait some time for the device changing baudrate done */ 571 usleep_range(20000, 22000); 572 573 /* Test the new baudrate */ 574 wmt_params.op = BTMTK_WMT_TEST; 575 wmt_params.flag = 7; 576 wmt_params.dlen = 0; 577 wmt_params.data = NULL; 578 wmt_params.status = NULL; 579 580 err = mtk_hci_wmt_sync(hdev, &wmt_params); 581 if (err < 0) { 582 bt_dev_err(hdev, "Failed to test new baudrate (%d)", 583 err); 584 return err; 585 } 586 587 bdev->curr_speed = bdev->desired_speed; 588 589 return 0; 590 } 591 592 static int btmtkuart_setup(struct hci_dev *hdev) 593 { 594 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 595 struct btmtk_hci_wmt_params wmt_params; 596 ktime_t calltime, delta, rettime; 597 struct btmtk_tci_sleep tci_sleep; 598 unsigned long long duration; 599 struct sk_buff *skb; 600 int err, status; 601 u8 param = 0x1; 602 603 calltime = ktime_get(); 604 605 /* Wakeup MCUSYS is required for certain devices before we start to 606 * do any setups. 607 */ 608 if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) { 609 wmt_params.op = BTMTK_WMT_WAKEUP; 610 wmt_params.flag = 3; 611 wmt_params.dlen = 0; 612 wmt_params.data = NULL; 613 wmt_params.status = NULL; 614 615 err = mtk_hci_wmt_sync(hdev, &wmt_params); 616 if (err < 0) { 617 bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err); 618 return err; 619 } 620 621 clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 622 } 623 624 if (btmtkuart_is_standalone(bdev)) 625 btmtkuart_change_baudrate(hdev); 626 627 /* Query whether the firmware is already download */ 628 wmt_params.op = BTMTK_WMT_SEMAPHORE; 629 wmt_params.flag = 1; 630 wmt_params.dlen = 0; 631 wmt_params.data = NULL; 632 wmt_params.status = &status; 633 634 err = mtk_hci_wmt_sync(hdev, &wmt_params); 635 if (err < 0) { 636 bt_dev_err(hdev, "Failed to query firmware status (%d)", err); 637 return err; 638 } 639 640 if (status == BTMTK_WMT_PATCH_DONE) { 641 bt_dev_info(hdev, "Firmware already downloaded"); 642 goto ignore_setup_fw; 643 } 644 645 /* Setup a firmware which the device definitely requires */ 646 err = btmtk_setup_firmware(hdev, bdev->data->fwname, mtk_hci_wmt_sync); 647 if (err < 0) 648 return err; 649 650 ignore_setup_fw: 651 /* Query whether the device is already enabled */ 652 err = readx_poll_timeout(btmtkuart_func_query, hdev, status, 653 status < 0 || status != BTMTK_WMT_ON_PROGRESS, 654 2000, 5000000); 655 /* -ETIMEDOUT happens */ 656 if (err < 0) 657 return err; 658 659 /* The other errors happen in btusb_mtk_func_query */ 660 if (status < 0) 661 return status; 662 663 if (status == BTMTK_WMT_ON_DONE) { 664 bt_dev_info(hdev, "function already on"); 665 goto ignore_func_on; 666 } 667 668 /* Enable Bluetooth protocol */ 669 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 670 wmt_params.flag = 0; 671 wmt_params.dlen = sizeof(param); 672 wmt_params.data = ¶m; 673 wmt_params.status = NULL; 674 675 err = mtk_hci_wmt_sync(hdev, &wmt_params); 676 if (err < 0) { 677 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 678 return err; 679 } 680 681 ignore_func_on: 682 /* Apply the low power environment setup */ 683 tci_sleep.mode = 0x5; 684 tci_sleep.duration = cpu_to_le16(0x640); 685 tci_sleep.host_duration = cpu_to_le16(0x640); 686 tci_sleep.host_wakeup_pin = 0; 687 tci_sleep.time_compensation = 0; 688 689 skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep, 690 HCI_INIT_TIMEOUT); 691 if (IS_ERR(skb)) { 692 err = PTR_ERR(skb); 693 bt_dev_err(hdev, "Failed to apply low power setting (%d)", err); 694 return err; 695 } 696 kfree_skb(skb); 697 698 rettime = ktime_get(); 699 delta = ktime_sub(rettime, calltime); 700 duration = (unsigned long long)ktime_to_ns(delta) >> 10; 701 702 bt_dev_info(hdev, "Device setup in %llu usecs", duration); 703 704 return 0; 705 } 706 707 static int btmtkuart_shutdown(struct hci_dev *hdev) 708 { 709 struct btmtk_hci_wmt_params wmt_params; 710 u8 param = 0x0; 711 int err; 712 713 /* Disable the device */ 714 wmt_params.op = BTMTK_WMT_FUNC_CTRL; 715 wmt_params.flag = 0; 716 wmt_params.dlen = sizeof(param); 717 wmt_params.data = ¶m; 718 wmt_params.status = NULL; 719 720 err = mtk_hci_wmt_sync(hdev, &wmt_params); 721 if (err < 0) { 722 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err); 723 return err; 724 } 725 726 return 0; 727 } 728 729 static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 730 { 731 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev); 732 struct mtk_stp_hdr *shdr; 733 int err, dlen, type = 0; 734 735 /* Prepend skb with frame type */ 736 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 737 738 /* Make sure that there is enough rooms for STP header and trailer */ 739 if (unlikely(skb_headroom(skb) < sizeof(*shdr)) || 740 (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) { 741 err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE, 742 GFP_ATOMIC); 743 if (err < 0) 744 return err; 745 } 746 747 /* Add the STP header */ 748 dlen = skb->len; 749 shdr = skb_push(skb, sizeof(*shdr)); 750 shdr->prefix = 0x80; 751 shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12)); 752 shdr->cs = 0; /* MT7622 doesn't care about checksum value */ 753 754 /* Add the STP trailer */ 755 skb_put_zero(skb, MTK_STP_TLR_SIZE); 756 757 skb_queue_tail(&bdev->txq, skb); 758 759 btmtkuart_tx_wakeup(bdev); 760 return 0; 761 } 762 763 static int btmtkuart_parse_dt(struct serdev_device *serdev) 764 { 765 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 766 struct device_node *node = serdev->dev.of_node; 767 u32 speed = 921600; 768 int err; 769 770 if (btmtkuart_is_standalone(bdev)) { 771 of_property_read_u32(node, "current-speed", &speed); 772 773 bdev->desired_speed = speed; 774 775 bdev->vcc = devm_regulator_get(&serdev->dev, "vcc"); 776 if (IS_ERR(bdev->vcc)) { 777 err = PTR_ERR(bdev->vcc); 778 return err; 779 } 780 781 bdev->osc = devm_clk_get_optional(&serdev->dev, "osc"); 782 if (IS_ERR(bdev->osc)) { 783 err = PTR_ERR(bdev->osc); 784 return err; 785 } 786 787 bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot", 788 GPIOD_OUT_LOW); 789 if (IS_ERR(bdev->boot)) { 790 err = PTR_ERR(bdev->boot); 791 return err; 792 } 793 794 bdev->pinctrl = devm_pinctrl_get(&serdev->dev); 795 if (IS_ERR(bdev->pinctrl)) { 796 err = PTR_ERR(bdev->pinctrl); 797 return err; 798 } 799 800 bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl, 801 "default"); 802 if (IS_ERR(bdev->pins_boot) && !bdev->boot) { 803 err = PTR_ERR(bdev->pins_boot); 804 dev_err(&serdev->dev, 805 "Should assign RXD to LOW at boot stage\n"); 806 return err; 807 } 808 809 bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl, 810 "runtime"); 811 if (IS_ERR(bdev->pins_runtime)) { 812 err = PTR_ERR(bdev->pins_runtime); 813 return err; 814 } 815 816 bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset", 817 GPIOD_OUT_LOW); 818 if (IS_ERR(bdev->reset)) { 819 err = PTR_ERR(bdev->reset); 820 return err; 821 } 822 } else if (btmtkuart_is_builtin_soc(bdev)) { 823 bdev->clk = devm_clk_get(&serdev->dev, "ref"); 824 if (IS_ERR(bdev->clk)) 825 return PTR_ERR(bdev->clk); 826 } 827 828 return 0; 829 } 830 831 static int btmtkuart_probe(struct serdev_device *serdev) 832 { 833 struct btmtkuart_dev *bdev; 834 struct hci_dev *hdev; 835 int err; 836 837 bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL); 838 if (!bdev) 839 return -ENOMEM; 840 841 bdev->data = of_device_get_match_data(&serdev->dev); 842 if (!bdev->data) 843 return -ENODEV; 844 845 bdev->serdev = serdev; 846 serdev_device_set_drvdata(serdev, bdev); 847 848 serdev_device_set_client_ops(serdev, &btmtkuart_client_ops); 849 850 err = btmtkuart_parse_dt(serdev); 851 if (err < 0) 852 return err; 853 854 INIT_WORK(&bdev->tx_work, btmtkuart_tx_work); 855 skb_queue_head_init(&bdev->txq); 856 857 /* Initialize and register HCI device */ 858 hdev = hci_alloc_dev(); 859 if (!hdev) { 860 dev_err(&serdev->dev, "Can't allocate HCI device\n"); 861 return -ENOMEM; 862 } 863 864 bdev->hdev = hdev; 865 866 hdev->bus = HCI_UART; 867 hci_set_drvdata(hdev, bdev); 868 869 hdev->open = btmtkuart_open; 870 hdev->close = btmtkuart_close; 871 hdev->flush = btmtkuart_flush; 872 hdev->setup = btmtkuart_setup; 873 hdev->shutdown = btmtkuart_shutdown; 874 hdev->send = btmtkuart_send_frame; 875 hdev->set_bdaddr = btmtk_set_bdaddr; 876 SET_HCIDEV_DEV(hdev, &serdev->dev); 877 878 hdev->manufacturer = 70; 879 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks); 880 881 if (btmtkuart_is_standalone(bdev)) { 882 err = clk_prepare_enable(bdev->osc); 883 if (err < 0) 884 goto err_hci_free_dev; 885 886 if (bdev->boot) { 887 gpiod_set_value_cansleep(bdev->boot, 1); 888 } else { 889 /* Switch to the specific pin state for the booting 890 * requires. 891 */ 892 pinctrl_select_state(bdev->pinctrl, bdev->pins_boot); 893 } 894 895 /* Power on */ 896 err = regulator_enable(bdev->vcc); 897 if (err < 0) 898 goto err_clk_disable_unprepare; 899 900 /* Reset if the reset-gpios is available otherwise the board 901 * -level design should be guaranteed. 902 */ 903 if (bdev->reset) { 904 gpiod_set_value_cansleep(bdev->reset, 1); 905 usleep_range(1000, 2000); 906 gpiod_set_value_cansleep(bdev->reset, 0); 907 } 908 909 /* Wait some time until device got ready and switch to the pin 910 * mode the device requires for UART transfers. 911 */ 912 msleep(50); 913 914 if (bdev->boot) 915 devm_gpiod_put(&serdev->dev, bdev->boot); 916 917 pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime); 918 919 /* A standalone device doesn't depends on power domain on SoC, 920 * so mark it as no callbacks. 921 */ 922 pm_runtime_no_callbacks(&serdev->dev); 923 924 set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state); 925 } 926 927 err = hci_register_dev(hdev); 928 if (err < 0) { 929 dev_err(&serdev->dev, "Can't register HCI device\n"); 930 goto err_regulator_disable; 931 } 932 933 return 0; 934 935 err_regulator_disable: 936 if (btmtkuart_is_standalone(bdev)) 937 regulator_disable(bdev->vcc); 938 err_clk_disable_unprepare: 939 if (btmtkuart_is_standalone(bdev)) 940 clk_disable_unprepare(bdev->osc); 941 err_hci_free_dev: 942 hci_free_dev(hdev); 943 944 return err; 945 } 946 947 static void btmtkuart_remove(struct serdev_device *serdev) 948 { 949 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev); 950 struct hci_dev *hdev = bdev->hdev; 951 952 if (btmtkuart_is_standalone(bdev)) { 953 regulator_disable(bdev->vcc); 954 clk_disable_unprepare(bdev->osc); 955 } 956 957 hci_unregister_dev(hdev); 958 hci_free_dev(hdev); 959 } 960 961 static const struct btmtkuart_data mt7622_data __maybe_unused = { 962 .fwname = FIRMWARE_MT7622, 963 }; 964 965 static const struct btmtkuart_data mt7663_data __maybe_unused = { 966 .flags = BTMTKUART_FLAG_STANDALONE_HW, 967 .fwname = FIRMWARE_MT7663, 968 }; 969 970 static const struct btmtkuart_data mt7668_data __maybe_unused = { 971 .flags = BTMTKUART_FLAG_STANDALONE_HW, 972 .fwname = FIRMWARE_MT7668, 973 }; 974 975 #ifdef CONFIG_OF 976 static const struct of_device_id mtk_of_match_table[] = { 977 { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data}, 978 { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data}, 979 { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data}, 980 { } 981 }; 982 MODULE_DEVICE_TABLE(of, mtk_of_match_table); 983 #endif 984 985 static struct serdev_device_driver btmtkuart_driver = { 986 .probe = btmtkuart_probe, 987 .remove = btmtkuart_remove, 988 .driver = { 989 .name = "btmtkuart", 990 .of_match_table = of_match_ptr(mtk_of_match_table), 991 }, 992 }; 993 994 module_serdev_device_driver(btmtkuart_driver); 995 996 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); 997 MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION); 998 MODULE_VERSION(VERSION); 999 MODULE_LICENSE("GPL"); 1000