1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2018 MediaTek Inc.
5 * Bluetooth support for MediaTek serial devices
7 * Author: Sean Wang <sean.wang@mediatek.com>
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>
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>
27 #include <net/bluetooth/bluetooth.h>
28 #include <net/bluetooth/hci_core.h>
34 #define FIRMWARE_MT7622 "/*(DEBLOBBED)*/"
35 #define FIRMWARE_MT7663 "/*(DEBLOBBED)*/"
36 #define FIRMWARE_MT7668 "/*(DEBLOBBED)*/"
38 #define MTK_STP_TLR_SIZE 2
40 #define BTMTKUART_TX_STATE_ACTIVE 1
41 #define BTMTKUART_TX_STATE_WAKEUP 2
42 #define BTMTKUART_TX_WAIT_VND_EVT 3
43 #define BTMTKUART_REQUIRED_WAKEUP 4
45 #define BTMTKUART_FLAG_STANDALONE_HW BIT(0)
48 MTK_WMT_PATCH_DWNLD = 0x1,
52 MTK_WMT_FUNC_CTRL = 0x6,
54 MTK_WMT_SEMAPHORE = 0x17,
59 BTMTK_WMT_PATCH_UNDONE,
63 BTMTK_WMT_ON_PROGRESS,
72 struct btmtkuart_data {
84 struct mtk_hci_wmt_cmd {
85 struct mtk_wmt_hdr hdr;
89 struct btmtk_hci_wmt_evt {
90 struct hci_event_hdr hhdr;
91 struct mtk_wmt_hdr whdr;
94 struct btmtk_hci_wmt_evt_funcc {
95 struct btmtk_hci_wmt_evt hwhdr;
99 struct btmtk_tci_sleep {
102 __le16 host_duration;
104 u8 time_compensation;
107 struct btmtk_hci_wmt_params {
115 struct btmtkuart_dev {
116 struct hci_dev *hdev;
117 struct serdev_device *serdev;
121 struct regulator *vcc;
122 struct gpio_desc *reset;
123 struct gpio_desc *boot;
124 struct pinctrl *pinctrl;
125 struct pinctrl_state *pins_runtime;
126 struct pinctrl_state *pins_boot;
127 speed_t desired_speed;
130 struct work_struct tx_work;
131 unsigned long tx_state;
132 struct sk_buff_head txq;
134 struct sk_buff *rx_skb;
135 struct sk_buff *evt_skb;
141 const struct btmtkuart_data *data;
144 #define btmtkuart_is_standalone(bdev) \
145 ((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
146 #define btmtkuart_is_builtin_soc(bdev) \
147 !((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
149 static int mtk_hci_wmt_sync(struct hci_dev *hdev,
150 struct btmtk_hci_wmt_params *wmt_params)
152 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
153 struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
154 u32 hlen, status = BTMTK_WMT_INVALID;
155 struct btmtk_hci_wmt_evt *wmt_evt;
156 struct mtk_hci_wmt_cmd wc;
157 struct mtk_wmt_hdr *hdr;
160 hlen = sizeof(*hdr) + wmt_params->dlen;
166 hdr = (struct mtk_wmt_hdr *)&wc;
168 hdr->op = wmt_params->op;
169 hdr->dlen = cpu_to_le16(wmt_params->dlen + 1);
170 hdr->flag = wmt_params->flag;
171 memcpy(wc.data, wmt_params->data, wmt_params->dlen);
173 set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
175 err = __hci_cmd_send(hdev, 0xfc6f, hlen, &wc);
177 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
181 /* The vendor specific WMT commands are all answered by a vendor
182 * specific event and will not have the Command Status or Command
183 * Complete as with usual HCI command flow control.
185 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT
186 * state to be cleared. The driver specific event receive routine
187 * will clear that state and with that indicate completion of the
190 err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT,
191 TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
193 bt_dev_err(hdev, "Execution of wmt command interrupted");
194 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
199 bt_dev_err(hdev, "Execution of wmt command timed out");
200 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
205 /* Parse and handle the return WMT event */
206 wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data;
207 if (wmt_evt->whdr.op != hdr->op) {
208 bt_dev_err(hdev, "Wrong op received %d expected %d",
209 wmt_evt->whdr.op, hdr->op);
214 switch (wmt_evt->whdr.op) {
215 case MTK_WMT_SEMAPHORE:
216 if (wmt_evt->whdr.flag == 2)
217 status = BTMTK_WMT_PATCH_UNDONE;
219 status = BTMTK_WMT_PATCH_DONE;
221 case MTK_WMT_FUNC_CTRL:
222 wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt;
223 if (be16_to_cpu(wmt_evt_funcc->status) == 0x404)
224 status = BTMTK_WMT_ON_DONE;
225 else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420)
226 status = BTMTK_WMT_ON_PROGRESS;
228 status = BTMTK_WMT_ON_UNDONE;
232 if (wmt_params->status)
233 *wmt_params->status = status;
236 kfree_skb(bdev->evt_skb);
237 bdev->evt_skb = NULL;
242 static int mtk_setup_firmware(struct hci_dev *hdev, const char *fwname)
244 struct btmtk_hci_wmt_params wmt_params;
245 const struct firmware *fw;
251 err = reject_firmware(&fw, fwname, &hdev->dev);
253 bt_dev_err(hdev, "Failed to load firmware file (%d)", err);
260 /* The size of patch header is 30 bytes, should be skip */
270 wmt_params.op = MTK_WMT_PATCH_DWNLD;
271 wmt_params.status = NULL;
273 while (fw_size > 0) {
274 dlen = min_t(int, 250, fw_size);
276 /* Tell device the position in sequence */
277 if (fw_size - dlen <= 0)
279 else if (fw_size < fw->size - 30)
282 wmt_params.flag = flag;
283 wmt_params.dlen = dlen;
284 wmt_params.data = fw_ptr;
286 err = mtk_hci_wmt_sync(hdev, &wmt_params);
288 bt_dev_err(hdev, "Failed to send wmt patch dwnld (%d)",
297 wmt_params.op = MTK_WMT_RST;
300 wmt_params.data = NULL;
301 wmt_params.status = NULL;
303 /* Activate funciton the firmware providing to */
304 err = mtk_hci_wmt_sync(hdev, &wmt_params);
306 bt_dev_err(hdev, "Failed to send wmt rst (%d)", err);
310 /* Wait a few moments for firmware activation done */
311 usleep_range(10000, 12000);
314 release_firmware(fw);
318 static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
320 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
321 struct hci_event_hdr *hdr = (void *)skb->data;
324 /* Fix up the vendor event id with 0xff for vendor specific instead
325 * of 0xe4 so that event send via monitoring socket can be parsed
328 if (hdr->evt == 0xe4)
329 hdr->evt = HCI_EV_VENDOR;
331 /* When someone waits for the WMT event, the skb is being cloned
332 * and being processed the events from there then.
334 if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) {
335 bdev->evt_skb = skb_clone(skb, GFP_KERNEL);
336 if (!bdev->evt_skb) {
342 err = hci_recv_frame(hdev, skb);
346 if (hdr->evt == HCI_EV_VENDOR) {
347 if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT,
349 /* Barrier to sync with other CPUs */
350 smp_mb__after_atomic();
351 wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT);
358 kfree_skb(bdev->evt_skb);
359 bdev->evt_skb = NULL;
365 static const struct h4_recv_pkt mtk_recv_pkts[] = {
366 { H4_RECV_ACL, .recv = hci_recv_frame },
367 { H4_RECV_SCO, .recv = hci_recv_frame },
368 { H4_RECV_EVENT, .recv = btmtkuart_recv_event },
371 static void btmtkuart_tx_work(struct work_struct *work)
373 struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev,
375 struct serdev_device *serdev = bdev->serdev;
376 struct hci_dev *hdev = bdev->hdev;
379 clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
382 struct sk_buff *skb = skb_dequeue(&bdev->txq);
388 len = serdev_device_write_buf(serdev, skb->data,
390 hdev->stat.byte_tx += len;
394 skb_queue_head(&bdev->txq, skb);
398 switch (hci_skb_pkt_type(skb)) {
399 case HCI_COMMAND_PKT:
402 case HCI_ACLDATA_PKT:
405 case HCI_SCODATA_PKT:
413 if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state))
417 clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state);
420 static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev)
422 if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state))
423 set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
425 schedule_work(&bdev->tx_work);
428 static const unsigned char *
429 mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count,
432 struct mtk_stp_hdr *shdr;
434 /* The cursor is reset when all the data of STP is consumed out */
435 if (!bdev->stp_dlen && bdev->stp_cursor >= 6)
436 bdev->stp_cursor = 0;
438 /* Filling pad until all STP info is obtained */
439 while (bdev->stp_cursor < 6 && count > 0) {
440 bdev->stp_pad[bdev->stp_cursor] = *data;
446 /* Retrieve STP info and have a sanity check */
447 if (!bdev->stp_dlen && bdev->stp_cursor >= 6) {
448 shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2];
449 bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff;
451 /* Resync STP when unexpected data is being read */
452 if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) {
453 bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)",
454 shdr->prefix, bdev->stp_dlen);
455 bdev->stp_cursor = 2;
460 /* Directly quit when there's no data found for H4 can process */
464 /* Tranlate to how much the size of data H4 can handle so far */
465 *sz_h4 = min_t(int, count, bdev->stp_dlen);
467 /* Update the remaining size of STP packet */
468 bdev->stp_dlen -= *sz_h4;
470 /* Data points to STP payload which can be handled by H4 */
474 static int btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count)
476 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
477 const unsigned char *p_left = data, *p_h4;
478 int sz_left = count, sz_h4, adv;
481 while (sz_left > 0) {
482 /* The serial data received from MT7622 BT controller is
483 * at all time padded around with the STP header and tailer.
485 * A full STP packet is looking like
486 * -----------------------------------
487 * | STP header | H:4 | STP tailer |
488 * -----------------------------------
489 * but it doesn't guarantee to contain a full H:4 packet which
490 * means that it's possible for multiple STP packets forms a
491 * full H:4 packet that means extra STP header + length doesn't
492 * indicate a full H:4 frame, things can fragment. Whose length
493 * recorded in STP header just shows up the most length the
494 * H:4 engine can handle currently.
497 p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4);
505 bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4,
506 sz_h4, mtk_recv_pkts,
507 ARRAY_SIZE(mtk_recv_pkts));
508 if (IS_ERR(bdev->rx_skb)) {
509 err = PTR_ERR(bdev->rx_skb);
510 bt_dev_err(bdev->hdev,
511 "Frame reassembly failed (%d)", err);
523 static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data,
526 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
529 err = btmtkuart_recv(bdev->hdev, data, count);
533 bdev->hdev->stat.byte_rx += count;
538 static void btmtkuart_write_wakeup(struct serdev_device *serdev)
540 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
542 btmtkuart_tx_wakeup(bdev);
545 static const struct serdev_device_ops btmtkuart_client_ops = {
546 .receive_buf = btmtkuart_receive_buf,
547 .write_wakeup = btmtkuart_write_wakeup,
550 static int btmtkuart_open(struct hci_dev *hdev)
552 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
556 err = serdev_device_open(bdev->serdev);
558 bt_dev_err(hdev, "Unable to open UART device %s",
559 dev_name(&bdev->serdev->dev));
563 if (btmtkuart_is_standalone(bdev)) {
564 if (bdev->curr_speed != bdev->desired_speed)
565 err = serdev_device_set_baudrate(bdev->serdev,
568 err = serdev_device_set_baudrate(bdev->serdev,
569 bdev->desired_speed);
572 bt_dev_err(hdev, "Unable to set baudrate UART device %s",
573 dev_name(&bdev->serdev->dev));
574 goto err_serdev_close;
577 serdev_device_set_flow_control(bdev->serdev, false);
580 bdev->stp_cursor = 2;
583 dev = &bdev->serdev->dev;
585 /* Enable the power domain and clock the device requires */
586 pm_runtime_enable(dev);
587 err = pm_runtime_get_sync(dev);
589 pm_runtime_put_noidle(dev);
590 goto err_disable_rpm;
593 err = clk_prepare_enable(bdev->clk);
600 pm_runtime_put_sync(dev);
602 pm_runtime_disable(dev);
604 serdev_device_close(bdev->serdev);
609 static int btmtkuart_close(struct hci_dev *hdev)
611 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
612 struct device *dev = &bdev->serdev->dev;
614 /* Shutdown the clock and power domain the device requires */
615 clk_disable_unprepare(bdev->clk);
616 pm_runtime_put_sync(dev);
617 pm_runtime_disable(dev);
619 serdev_device_close(bdev->serdev);
624 static int btmtkuart_flush(struct hci_dev *hdev)
626 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
628 /* Flush any pending characters */
629 serdev_device_write_flush(bdev->serdev);
630 skb_queue_purge(&bdev->txq);
632 cancel_work_sync(&bdev->tx_work);
634 kfree_skb(bdev->rx_skb);
637 bdev->stp_cursor = 2;
643 static int btmtkuart_func_query(struct hci_dev *hdev)
645 struct btmtk_hci_wmt_params wmt_params;
649 /* Query whether the function is enabled */
650 wmt_params.op = MTK_WMT_FUNC_CTRL;
652 wmt_params.dlen = sizeof(param);
653 wmt_params.data = ¶m;
654 wmt_params.status = &status;
656 err = mtk_hci_wmt_sync(hdev, &wmt_params);
658 bt_dev_err(hdev, "Failed to query function status (%d)", err);
665 static int btmtkuart_change_baudrate(struct hci_dev *hdev)
667 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
668 struct btmtk_hci_wmt_params wmt_params;
673 /* Indicate the device to enter the probe state the host is
674 * ready to change a new baudrate.
676 baudrate = cpu_to_le32(bdev->desired_speed);
677 wmt_params.op = MTK_WMT_HIF;
680 wmt_params.data = &baudrate;
681 wmt_params.status = NULL;
683 err = mtk_hci_wmt_sync(hdev, &wmt_params);
685 bt_dev_err(hdev, "Failed to device baudrate (%d)", err);
689 err = serdev_device_set_baudrate(bdev->serdev,
690 bdev->desired_speed);
692 bt_dev_err(hdev, "Failed to set up host baudrate (%d)",
697 serdev_device_set_flow_control(bdev->serdev, false);
699 /* Send a dummy byte 0xff to activate the new baudrate */
701 err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param));
702 if (err < 0 || err < sizeof(param))
705 serdev_device_wait_until_sent(bdev->serdev, 0);
707 /* Wait some time for the device changing baudrate done */
708 usleep_range(20000, 22000);
710 /* Test the new baudrate */
711 wmt_params.op = MTK_WMT_TEST;
714 wmt_params.data = NULL;
715 wmt_params.status = NULL;
717 err = mtk_hci_wmt_sync(hdev, &wmt_params);
719 bt_dev_err(hdev, "Failed to test new baudrate (%d)",
724 bdev->curr_speed = bdev->desired_speed;
729 static int btmtkuart_setup(struct hci_dev *hdev)
731 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
732 struct btmtk_hci_wmt_params wmt_params;
733 ktime_t calltime, delta, rettime;
734 struct btmtk_tci_sleep tci_sleep;
735 unsigned long long duration;
740 calltime = ktime_get();
742 /* Wakeup MCUSYS is required for certain devices before we start to
745 if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) {
746 wmt_params.op = MTK_WMT_WAKEUP;
749 wmt_params.data = NULL;
750 wmt_params.status = NULL;
752 err = mtk_hci_wmt_sync(hdev, &wmt_params);
754 bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err);
758 clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
761 if (btmtkuart_is_standalone(bdev))
762 btmtkuart_change_baudrate(hdev);
764 /* Query whether the firmware is already download */
765 wmt_params.op = MTK_WMT_SEMAPHORE;
768 wmt_params.data = NULL;
769 wmt_params.status = &status;
771 err = mtk_hci_wmt_sync(hdev, &wmt_params);
773 bt_dev_err(hdev, "Failed to query firmware status (%d)", err);
777 if (status == BTMTK_WMT_PATCH_DONE) {
778 bt_dev_info(hdev, "Firmware already downloaded");
779 goto ignore_setup_fw;
782 /* Setup a firmware which the device definitely requires */
783 err = mtk_setup_firmware(hdev, bdev->data->fwname);
788 /* Query whether the device is already enabled */
789 err = readx_poll_timeout(btmtkuart_func_query, hdev, status,
790 status < 0 || status != BTMTK_WMT_ON_PROGRESS,
792 /* -ETIMEDOUT happens */
796 /* The other errors happen in btusb_mtk_func_query */
800 if (status == BTMTK_WMT_ON_DONE) {
801 bt_dev_info(hdev, "function already on");
805 /* Enable Bluetooth protocol */
806 wmt_params.op = MTK_WMT_FUNC_CTRL;
808 wmt_params.dlen = sizeof(param);
809 wmt_params.data = ¶m;
810 wmt_params.status = NULL;
812 err = mtk_hci_wmt_sync(hdev, &wmt_params);
814 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
819 /* Apply the low power environment setup */
820 tci_sleep.mode = 0x5;
821 tci_sleep.duration = cpu_to_le16(0x640);
822 tci_sleep.host_duration = cpu_to_le16(0x640);
823 tci_sleep.host_wakeup_pin = 0;
824 tci_sleep.time_compensation = 0;
826 skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep,
830 bt_dev_err(hdev, "Failed to apply low power setting (%d)", err);
835 rettime = ktime_get();
836 delta = ktime_sub(rettime, calltime);
837 duration = (unsigned long long)ktime_to_ns(delta) >> 10;
839 bt_dev_info(hdev, "Device setup in %llu usecs", duration);
844 static int btmtkuart_shutdown(struct hci_dev *hdev)
846 struct btmtk_hci_wmt_params wmt_params;
850 /* Disable the device */
851 wmt_params.op = MTK_WMT_FUNC_CTRL;
853 wmt_params.dlen = sizeof(param);
854 wmt_params.data = ¶m;
855 wmt_params.status = NULL;
857 err = mtk_hci_wmt_sync(hdev, &wmt_params);
859 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
866 static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
868 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
869 struct mtk_stp_hdr *shdr;
870 int err, dlen, type = 0;
872 /* Prepend skb with frame type */
873 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
875 /* Make sure that there is enough rooms for STP header and trailer */
876 if (unlikely(skb_headroom(skb) < sizeof(*shdr)) ||
877 (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) {
878 err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE,
884 /* Add the STP header */
886 shdr = skb_push(skb, sizeof(*shdr));
888 shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12));
889 shdr->cs = 0; /* MT7622 doesn't care about checksum value */
891 /* Add the STP trailer */
892 skb_put_zero(skb, MTK_STP_TLR_SIZE);
894 skb_queue_tail(&bdev->txq, skb);
896 btmtkuart_tx_wakeup(bdev);
900 static int btmtkuart_parse_dt(struct serdev_device *serdev)
902 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
903 struct device_node *node = serdev->dev.of_node;
907 if (btmtkuart_is_standalone(bdev)) {
908 of_property_read_u32(node, "current-speed", &speed);
910 bdev->desired_speed = speed;
912 bdev->vcc = devm_regulator_get(&serdev->dev, "vcc");
913 if (IS_ERR(bdev->vcc)) {
914 err = PTR_ERR(bdev->vcc);
918 bdev->osc = devm_clk_get_optional(&serdev->dev, "osc");
919 if (IS_ERR(bdev->osc)) {
920 err = PTR_ERR(bdev->osc);
924 bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot",
926 if (IS_ERR(bdev->boot)) {
927 err = PTR_ERR(bdev->boot);
931 bdev->pinctrl = devm_pinctrl_get(&serdev->dev);
932 if (IS_ERR(bdev->pinctrl)) {
933 err = PTR_ERR(bdev->pinctrl);
937 bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl,
939 if (IS_ERR(bdev->pins_boot) && !bdev->boot) {
940 err = PTR_ERR(bdev->pins_boot);
941 dev_err(&serdev->dev,
942 "Should assign RXD to LOW at boot stage\n");
946 bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl,
948 if (IS_ERR(bdev->pins_runtime)) {
949 err = PTR_ERR(bdev->pins_runtime);
953 bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset",
955 if (IS_ERR(bdev->reset)) {
956 err = PTR_ERR(bdev->reset);
959 } else if (btmtkuart_is_builtin_soc(bdev)) {
960 bdev->clk = devm_clk_get(&serdev->dev, "ref");
961 if (IS_ERR(bdev->clk))
962 return PTR_ERR(bdev->clk);
968 static int btmtkuart_probe(struct serdev_device *serdev)
970 struct btmtkuart_dev *bdev;
971 struct hci_dev *hdev;
974 bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL);
978 bdev->data = of_device_get_match_data(&serdev->dev);
982 bdev->serdev = serdev;
983 serdev_device_set_drvdata(serdev, bdev);
985 serdev_device_set_client_ops(serdev, &btmtkuart_client_ops);
987 err = btmtkuart_parse_dt(serdev);
991 INIT_WORK(&bdev->tx_work, btmtkuart_tx_work);
992 skb_queue_head_init(&bdev->txq);
994 /* Initialize and register HCI device */
995 hdev = hci_alloc_dev();
997 dev_err(&serdev->dev, "Can't allocate HCI device\n");
1003 hdev->bus = HCI_UART;
1004 hci_set_drvdata(hdev, bdev);
1006 hdev->open = btmtkuart_open;
1007 hdev->close = btmtkuart_close;
1008 hdev->flush = btmtkuart_flush;
1009 hdev->setup = btmtkuart_setup;
1010 hdev->shutdown = btmtkuart_shutdown;
1011 hdev->send = btmtkuart_send_frame;
1012 SET_HCIDEV_DEV(hdev, &serdev->dev);
1014 hdev->manufacturer = 70;
1015 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
1017 if (btmtkuart_is_standalone(bdev)) {
1018 err = clk_prepare_enable(bdev->osc);
1020 goto err_hci_free_dev;
1023 gpiod_set_value_cansleep(bdev->boot, 1);
1025 /* Switch to the specific pin state for the booting
1028 pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);
1032 err = regulator_enable(bdev->vcc);
1034 goto err_clk_disable_unprepare;
1036 /* Reset if the reset-gpios is available otherwise the board
1037 * -level design should be guaranteed.
1040 gpiod_set_value_cansleep(bdev->reset, 1);
1041 usleep_range(1000, 2000);
1042 gpiod_set_value_cansleep(bdev->reset, 0);
1045 /* Wait some time until device got ready and switch to the pin
1046 * mode the device requires for UART transfers.
1051 devm_gpiod_put(&serdev->dev, bdev->boot);
1053 pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime);
1055 /* A standalone device doesn't depends on power domain on SoC,
1056 * so mark it as no callbacks.
1058 pm_runtime_no_callbacks(&serdev->dev);
1060 set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
1063 err = hci_register_dev(hdev);
1065 dev_err(&serdev->dev, "Can't register HCI device\n");
1066 goto err_regulator_disable;
1071 err_regulator_disable:
1072 if (btmtkuart_is_standalone(bdev))
1073 regulator_disable(bdev->vcc);
1074 err_clk_disable_unprepare:
1075 if (btmtkuart_is_standalone(bdev))
1076 clk_disable_unprepare(bdev->osc);
1083 static void btmtkuart_remove(struct serdev_device *serdev)
1085 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
1086 struct hci_dev *hdev = bdev->hdev;
1088 if (btmtkuart_is_standalone(bdev)) {
1089 regulator_disable(bdev->vcc);
1090 clk_disable_unprepare(bdev->osc);
1093 hci_unregister_dev(hdev);
1097 static const struct btmtkuart_data mt7622_data = {
1098 .fwname = FIRMWARE_MT7622,
1101 static const struct btmtkuart_data mt7663_data = {
1102 .flags = BTMTKUART_FLAG_STANDALONE_HW,
1103 .fwname = FIRMWARE_MT7663,
1106 static const struct btmtkuart_data mt7668_data = {
1107 .flags = BTMTKUART_FLAG_STANDALONE_HW,
1108 .fwname = FIRMWARE_MT7668,
1112 static const struct of_device_id mtk_of_match_table[] = {
1113 { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data},
1114 { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data},
1115 { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data},
1118 MODULE_DEVICE_TABLE(of, mtk_of_match_table);
1121 static struct serdev_device_driver btmtkuart_driver = {
1122 .probe = btmtkuart_probe,
1123 .remove = btmtkuart_remove,
1125 .name = "btmtkuart",
1126 .of_match_table = of_match_ptr(mtk_of_match_table),
1130 module_serdev_device_driver(btmtkuart_driver);
1132 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
1133 MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION);
1134 MODULE_VERSION(VERSION);
1135 MODULE_LICENSE("GPL");