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1// SPDX-License-Identifier: GPL-2.02// Copyright (c) 2018 MediaTek Inc.3 4/*5 * Bluetooth support for MediaTek serial devices6 *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 "h4_recv.h"31#include "btmtk.h"32 33#define VERSION "0.2"34 35#define MTK_STP_TLR_SIZE 236 37#define BTMTKUART_TX_STATE_ACTIVE 138#define BTMTKUART_TX_STATE_WAKEUP 239#define BTMTKUART_TX_WAIT_VND_EVT 340#define BTMTKUART_REQUIRED_WAKEUP 441 42#define BTMTKUART_FLAG_STANDALONE_HW BIT(0)43 44struct mtk_stp_hdr {45 u8 prefix;46 __be16 dlen;47 u8 cs;48} __packed;49 50struct btmtkuart_data {51 unsigned int flags;52 const char *fwname;53};54 55struct 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 89static 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 vendor129 * specific event and will not have the Command Status or Command130 * Complete as with usual HCI command flow control.131 *132 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT133 * state to be cleared. The driver specific event receive routine134 * will clear that state and with that indicate completion of the135 * 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 else166 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 else175 status = BTMTK_WMT_ON_UNDONE;176 break;177 }178 179 if (wmt_params->status)180 *wmt_params->status = status;181 182err_free_wc:183 kfree(wc);184err_free_skb:185 kfree_skb(bdev->evt_skb);186 bdev->evt_skb = NULL;187 188 return err;189}190 191static 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 cloned198 * 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 223err_free_skb:224 kfree_skb(bdev->evt_skb);225 bdev->evt_skb = NULL;226 227err_out:228 return err;229}230 231static 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 237static 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 286static 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 294static const unsigned char *295mtk_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 340static 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 is349 * at all time padded around with the STP header and tailer.350 *351 * A full STP packet is looking like352 * -----------------------------------353 * | STP header | H:4 | STP tailer |354 * -----------------------------------355 * but it doesn't guarantee to contain a full H:4 packet which356 * means that it's possible for multiple STP packets forms a357 * full H:4 packet that means extra STP header + length doesn't358 * indicate a full H:4 frame, things can fragment. Whose length359 * recorded in STP header just shows up the most length the360 * 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 387static 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 399static 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 406static const struct serdev_device_ops btmtkuart_client_ops = {407 .receive_buf = btmtkuart_receive_buf,408 .write_wakeup = btmtkuart_write_wakeup,409};410 411static 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 else429 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 458err_put_rpm:459 pm_runtime_put_sync(dev);460err_disable_rpm:461 pm_runtime_disable(dev);462err_serdev_close:463 serdev_device_close(bdev->serdev);464err_open:465 return err;466}467 468static 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 483static 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 502static 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 524static 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 is533 * 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 588static 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 to602 * 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 646ignore_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 677ignore_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 703static 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 725static 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 759static 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 827static 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 booting886 * 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 board897 * -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 pin906 * 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 931err_regulator_disable:932 if (btmtkuart_is_standalone(bdev))933 regulator_disable(bdev->vcc);934err_clk_disable_unprepare:935 if (btmtkuart_is_standalone(bdev))936 clk_disable_unprepare(bdev->osc);937err_hci_free_dev:938 hci_free_dev(hdev);939 940 return err;941}942 943static 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 957static const struct btmtkuart_data mt7622_data __maybe_unused = {958 .fwname = FIRMWARE_MT7622,959};960 961static const struct btmtkuart_data mt7663_data __maybe_unused = {962 .flags = BTMTKUART_FLAG_STANDALONE_HW,963 .fwname = FIRMWARE_MT7663,964};965 966static const struct btmtkuart_data mt7668_data __maybe_unused = {967 .flags = BTMTKUART_FLAG_STANDALONE_HW,968 .fwname = FIRMWARE_MT7668,969};970 971#ifdef CONFIG_OF972static 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};978MODULE_DEVICE_TABLE(of, mtk_of_match_table);979#endif980 981static 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 990module_serdev_device_driver(btmtkuart_driver);991 992MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");993MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION);994MODULE_VERSION(VERSION);995MODULE_LICENSE("GPL");996