drivers/bluetooth/hci_mrvl.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *
  *  Bluetooth HCI UART driver for marvell devices
  *
  *  Copyright (C) 2016  Marvell International Ltd.
  *  Copyright (C) 2016  Intel Corporation
  */

 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/skbuff.h>
 #include <linux/firmware.h>
 #include <linux/module.h>
 #include <linux/tty.h>
 #include <linux/of.h>
 #include <linux/serdev.h>

 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>

 #include "hci_uart.h"

 #define HCI_FW_REQ_PKT 0xA5
 #define HCI_CHIP_VER_PKT 0xAA

 #define MRVL_ACK 0x5A
 #define MRVL_NAK 0xBF
 #define MRVL_RAW_DATA 0x1F

 enum {
 	STATE_CHIP_VER_PENDING,
 	STATE_FW_REQ_PENDING,
 };

 struct mrvl_data {
 	struct sk_buff *rx_skb;
 	struct sk_buff_head txq;
 	struct sk_buff_head rawq;
 	unsigned long flags;
 	unsigned int tx_len;
 	u8 id, rev;
 };

 struct mrvl_serdev {
 	struct hci_uart hu;
 };

 struct hci_mrvl_pkt {
 	__le16 lhs;
 	__le16 rhs;
 } __packed;
 #define HCI_MRVL_PKT_SIZE 4

 static int mrvl_open(struct hci_uart *hu)
 {
 	struct mrvl_data *mrvl;
 	int ret;

 	BT_DBG("hu %p", hu);

 	mrvl = kzalloc(sizeof(*mrvl), GFP_KERNEL);
 	if (!mrvl)
 		return -ENOMEM;

 	skb_queue_head_init(&mrvl->txq);
 	skb_queue_head_init(&mrvl->rawq);

 	set_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);

 	hu->priv = mrvl;

 	if (hu->serdev) {
 		ret = serdev_device_open(hu->serdev);
 		if (ret)
 			goto err;
 	}

 	return 0;
 err:
 	kfree(mrvl);

 	return ret;
 }

 static int mrvl_close(struct hci_uart *hu)
 {
 	struct mrvl_data *mrvl = hu->priv;

 	BT_DBG("hu %p", hu);

 	if (hu->serdev)
 		serdev_device_close(hu->serdev);

 	skb_queue_purge(&mrvl->txq);
 	skb_queue_purge(&mrvl->rawq);
 	kfree_skb(mrvl->rx_skb);
 	kfree(mrvl);

 	hu->priv = NULL;
 	return 0;
 }

 static int mrvl_flush(struct hci_uart *hu)
 {
 	struct mrvl_data *mrvl = hu->priv;

 	BT_DBG("hu %p", hu);

 	skb_queue_purge(&mrvl->txq);
 	skb_queue_purge(&mrvl->rawq);

 	return 0;
 }

 static struct sk_buff *mrvl_dequeue(struct hci_uart *hu)
 {
 	struct mrvl_data *mrvl = hu->priv;
 	struct sk_buff *skb;

 	skb = skb_dequeue(&mrvl->txq);
 	if (!skb) {
 		/* Any raw data ? */
 		skb = skb_dequeue(&mrvl->rawq);
 	} else {
 		/* Prepend skb with frame type */
 		memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 	}

 	return skb;
 }

 static int mrvl_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 {
 	struct mrvl_data *mrvl = hu->priv;

 	skb_queue_tail(&mrvl->txq, skb);
 	return 0;
 }

 static void mrvl_send_ack(struct hci_uart *hu, unsigned char type)
 {
 	struct mrvl_data *mrvl = hu->priv;
 	struct sk_buff *skb;

 	/* No H4 payload, only 1 byte header */
 	skb = bt_skb_alloc(0, GFP_ATOMIC);
 	if (!skb) {
 		bt_dev_err(hu->hdev, "Unable to alloc ack/nak packet");
 		return;
 	}
 	hci_skb_pkt_type(skb) = type;

 	skb_queue_tail(&mrvl->txq, skb);
 	hci_uart_tx_wakeup(hu);
 }

 static int mrvl_recv_fw_req(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_mrvl_pkt *pkt = (void *)skb->data;
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 	struct mrvl_data *mrvl = hu->priv;
 	int ret = 0;

 	if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
 		bt_dev_err(hdev, "Corrupted mrvl header");
 		mrvl_send_ack(hu, MRVL_NAK);
 		ret = -EINVAL;
 		goto done;
 	}
 	mrvl_send_ack(hu, MRVL_ACK);

 	if (!test_bit(STATE_FW_REQ_PENDING, &mrvl->flags)) {
 		bt_dev_err(hdev, "Received unexpected firmware request");
 		ret = -EINVAL;
 		goto done;
 	}

 	mrvl->tx_len = le16_to_cpu(pkt->lhs);

 	clear_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
 	smp_mb__after_atomic();
 	wake_up_bit(&mrvl->flags, STATE_FW_REQ_PENDING);

 done:
 	kfree_skb(skb);
 	return ret;
 }

 static int mrvl_recv_chip_ver(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct hci_mrvl_pkt *pkt = (void *)skb->data;
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 	struct mrvl_data *mrvl = hu->priv;
 	u16 version = le16_to_cpu(pkt->lhs);
 	int ret = 0;

 	if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
 		bt_dev_err(hdev, "Corrupted mrvl header");
 		mrvl_send_ack(hu, MRVL_NAK);
 		ret = -EINVAL;
 		goto done;
 	}
 	mrvl_send_ack(hu, MRVL_ACK);

 	if (!test_bit(STATE_CHIP_VER_PENDING, &mrvl->flags)) {
 		bt_dev_err(hdev, "Received unexpected chip version");
 		goto done;
 	}

 	mrvl->id = version;
 	mrvl->rev = version >> 8;

 	bt_dev_info(hdev, "Controller id = %x, rev = %x", mrvl->id, mrvl->rev);

 	clear_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
 	smp_mb__after_atomic();
 	wake_up_bit(&mrvl->flags, STATE_CHIP_VER_PENDING);

 done:
 	kfree_skb(skb);
 	return ret;
 }

 #define HCI_RECV_CHIP_VER \
 	.type = HCI_CHIP_VER_PKT, \
 	.hlen = HCI_MRVL_PKT_SIZE, \
 	.loff = 0, \
 	.lsize = 0, \
 	.maxlen = HCI_MRVL_PKT_SIZE

 #define HCI_RECV_FW_REQ \
 	.type = HCI_FW_REQ_PKT, \
 	.hlen = HCI_MRVL_PKT_SIZE, \
 	.loff = 0, \
 	.lsize = 0, \
 	.maxlen = HCI_MRVL_PKT_SIZE

 static const struct h4_recv_pkt mrvl_recv_pkts[] = {
 	{ H4_RECV_ACL,       .recv = hci_recv_frame     },
 	{ H4_RECV_SCO,       .recv = hci_recv_frame     },
 	{ H4_RECV_EVENT,     .recv = hci_recv_frame     },
 	{ HCI_RECV_FW_REQ,   .recv = mrvl_recv_fw_req   },
 	{ HCI_RECV_CHIP_VER, .recv = mrvl_recv_chip_ver },
 };

 static int mrvl_recv(struct hci_uart *hu, const void *data, int count)
 {
 	struct mrvl_data *mrvl = hu->priv;

 	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 		return -EUNATCH;

 	mrvl->rx_skb = h4_recv_buf(hu->hdev, mrvl->rx_skb, data, count,
 				    mrvl_recv_pkts,
 				    ARRAY_SIZE(mrvl_recv_pkts));
 	if (IS_ERR(mrvl->rx_skb)) {
 		int err = PTR_ERR(mrvl->rx_skb);
 		bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 		mrvl->rx_skb = NULL;
 		return err;
 	}

 	return count;
 }

 static int mrvl_load_firmware(struct hci_dev *hdev, const char *name)
 {
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 	struct mrvl_data *mrvl = hu->priv;
 	const struct firmware *fw = NULL;
 	const u8 *fw_ptr, *fw_max;
 	int err;

 	err = request_firmware(&fw, name, &hdev->dev);
 	if (err < 0) {
 		bt_dev_err(hdev, "Failed to load firmware file %s", name);
 		return err;
 	}

 	fw_ptr = fw->data;
 	fw_max = fw->data + fw->size;

 	bt_dev_info(hdev, "Loading %s", name);

 	set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);

 	while (fw_ptr <= fw_max) {
 		struct sk_buff *skb;

 		/* Controller drives the firmware load by sending firmware
 		 * request packets containing the expected fragment size.
 		 */
 		err = wait_on_bit_timeout(&mrvl->flags, STATE_FW_REQ_PENDING,
 					  TASK_INTERRUPTIBLE,
 					  msecs_to_jiffies(2000));
 		if (err == 1) {
 			bt_dev_err(hdev, "Firmware load interrupted");
 			err = -EINTR;
 			break;
 		} else if (err) {
 			bt_dev_err(hdev, "Firmware request timeout");
 			err = -ETIMEDOUT;
 			break;
 		}

 		bt_dev_dbg(hdev, "Firmware request, expecting %d bytes",
 			   mrvl->tx_len);

 		if (fw_ptr == fw_max) {
 			/* Controller requests a null size once firmware is
 			 * fully loaded. If controller expects more data, there
 			 * is an issue.
 			 */
 			if (!mrvl->tx_len) {
 				bt_dev_info(hdev, "Firmware loading complete");
 			} else {
 				bt_dev_err(hdev, "Firmware loading failure");
 				err = -EINVAL;
 			}
 			break;
 		}

 		if (fw_ptr + mrvl->tx_len > fw_max) {
 			mrvl->tx_len = fw_max - fw_ptr;
 			bt_dev_dbg(hdev, "Adjusting tx_len to %d",
 				   mrvl->tx_len);
 		}

 		skb = bt_skb_alloc(mrvl->tx_len, GFP_KERNEL);
 		if (!skb) {
 			bt_dev_err(hdev, "Failed to alloc mem for FW packet");
 			err = -ENOMEM;
 			break;
 		}
 		bt_cb(skb)->pkt_type = MRVL_RAW_DATA;

 		skb_put_data(skb, fw_ptr, mrvl->tx_len);
 		fw_ptr += mrvl->tx_len;

 		set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);

 		skb_queue_tail(&mrvl->rawq, skb);
 		hci_uart_tx_wakeup(hu);
 	}

 	release_firmware(fw);
 	return err;
 }

 static int mrvl_setup(struct hci_uart *hu)
 {
 	int err;

 	hci_uart_set_flow_control(hu, true);

 	err = mrvl_load_firmware(hu->hdev, "mrvl/helper_uart_3000000.bin");
 	if (err) {
 		bt_dev_err(hu->hdev, "Unable to download firmware helper");
 		return -EINVAL;
 	}

 	/* Let the final ack go out before switching the baudrate */
 	hci_uart_wait_until_sent(hu);

 	if (hu->serdev)
 		serdev_device_set_baudrate(hu->serdev, 3000000);
 	else
 		hci_uart_set_baudrate(hu, 3000000);

 	hci_uart_set_flow_control(hu, false);

 	err = mrvl_load_firmware(hu->hdev, "mrvl/uart8897_bt.bin");
 	if (err)
 		return err;

 	return 0;
 }

 static const struct hci_uart_proto mrvl_proto = {
 	.id		= HCI_UART_MRVL,
 	.name		= "Marvell",
 	.init_speed	= 115200,
 	.open		= mrvl_open,
 	.close		= mrvl_close,
 	.flush		= mrvl_flush,
 	.setup		= mrvl_setup,
 	.recv		= mrvl_recv,
 	.enqueue	= mrvl_enqueue,
 	.dequeue	= mrvl_dequeue,
 };

 static int mrvl_serdev_probe(struct serdev_device *serdev)
 {
 	struct mrvl_serdev *mrvldev;

 	mrvldev = devm_kzalloc(&serdev->dev, sizeof(*mrvldev), GFP_KERNEL);
 	if (!mrvldev)
 		return -ENOMEM;

 	mrvldev->hu.serdev = serdev;
 	serdev_device_set_drvdata(serdev, mrvldev);

 	return hci_uart_register_device(&mrvldev->hu, &mrvl_proto);
 }

 static void mrvl_serdev_remove(struct serdev_device *serdev)
 {
 	struct mrvl_serdev *mrvldev = serdev_device_get_drvdata(serdev);

 	hci_uart_unregister_device(&mrvldev->hu);
 }

 #ifdef CONFIG_OF
 static const struct of_device_id mrvl_bluetooth_of_match[] = {
 	{ .compatible = "mrvl,88w8897" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, mrvl_bluetooth_of_match);
 #endif

 static struct serdev_device_driver mrvl_serdev_driver = {
 	.probe = mrvl_serdev_probe,
 	.remove = mrvl_serdev_remove,
 	.driver = {
 		.name = "hci_uart_mrvl",
 		.of_match_table = of_match_ptr(mrvl_bluetooth_of_match),
 	},
 };

 int __init mrvl_init(void)
 {
 	serdev_device_driver_register(&mrvl_serdev_driver);

 	return hci_uart_register_proto(&mrvl_proto);
 }

 int __exit mrvl_deinit(void)
 {
 	serdev_device_driver_unregister(&mrvl_serdev_driver);

 	return hci_uart_unregister_proto(&mrvl_proto);
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	*
	* Bluetooth HCI UART driver for marvell devices
	*
	* Copyright (C) 2016 Marvell International Ltd.
	* Copyright (C) 2016 Intel Corporation
	*/

	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/skbuff.h>
	#include <linux/firmware.h>
	#include <linux/module.h>
	#include <linux/tty.h>
	#include <linux/of.h>
	#include <linux/serdev.h>

	#include <net/bluetooth/bluetooth.h>
	#include <net/bluetooth/hci_core.h>

	#include "hci_uart.h"

	#define HCI_FW_REQ_PKT 0xA5
	#define HCI_CHIP_VER_PKT 0xAA

	#define MRVL_ACK 0x5A
	#define MRVL_NAK 0xBF
	#define MRVL_RAW_DATA 0x1F

	enum {
	STATE_CHIP_VER_PENDING,
	STATE_FW_REQ_PENDING,
	};

	struct mrvl_data {
	struct sk_buff *rx_skb;
	struct sk_buff_head txq;
	struct sk_buff_head rawq;
	unsigned long flags;
	unsigned int tx_len;
	u8 id, rev;
	};

	struct mrvl_serdev {
	struct hci_uart hu;
	};

	struct hci_mrvl_pkt {
	__le16 lhs;
	__le16 rhs;
	} __packed;
	#define HCI_MRVL_PKT_SIZE 4

	static int mrvl_open(struct hci_uart *hu)
	{
	struct mrvl_data *mrvl;
	int ret;

	BT_DBG("hu %p", hu);

	mrvl = kzalloc(sizeof(*mrvl), GFP_KERNEL);
	if (!mrvl)
	return -ENOMEM;

	skb_queue_head_init(&mrvl->txq);
	skb_queue_head_init(&mrvl->rawq);

	set_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);

	hu->priv = mrvl;

	if (hu->serdev) {
	ret = serdev_device_open(hu->serdev);
	if (ret)
	goto err;
	}

	return 0;
	err:
	kfree(mrvl);

	return ret;
	}

	static int mrvl_close(struct hci_uart *hu)
	{
	struct mrvl_data *mrvl = hu->priv;

	BT_DBG("hu %p", hu);

	if (hu->serdev)
	serdev_device_close(hu->serdev);

	skb_queue_purge(&mrvl->txq);
	skb_queue_purge(&mrvl->rawq);
	kfree_skb(mrvl->rx_skb);
	kfree(mrvl);

	hu->priv = NULL;
	return 0;
	}

	static int mrvl_flush(struct hci_uart *hu)
	{
	struct mrvl_data *mrvl = hu->priv;

	BT_DBG("hu %p", hu);

	skb_queue_purge(&mrvl->txq);
	skb_queue_purge(&mrvl->rawq);

	return 0;
	}

	static struct sk_buff mrvl_dequeue(struct hci_uart hu)
	{
	struct mrvl_data *mrvl = hu->priv;
	struct sk_buff *skb;

	skb = skb_dequeue(&mrvl->txq);
	if (!skb) {
	/* Any raw data ? */
	skb = skb_dequeue(&mrvl->rawq);
	} else {
	/* Prepend skb with frame type */
	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
	}

	return skb;
	}

	static int mrvl_enqueue(struct hci_uart hu, struct sk_buff skb)
	{
	struct mrvl_data *mrvl = hu->priv;

	skb_queue_tail(&mrvl->txq, skb);
	return 0;
	}

	static void mrvl_send_ack(struct hci_uart *hu, unsigned char type)
	{
	struct mrvl_data *mrvl = hu->priv;
	struct sk_buff *skb;

	/* No H4 payload, only 1 byte header */
	skb = bt_skb_alloc(0, GFP_ATOMIC);
	if (!skb) {
	bt_dev_err(hu->hdev, "Unable to alloc ack/nak packet");
	return;
	}
	hci_skb_pkt_type(skb) = type;

	skb_queue_tail(&mrvl->txq, skb);
	hci_uart_tx_wakeup(hu);
	}

	static int mrvl_recv_fw_req(struct hci_dev hdev, struct sk_buff skb)
	{
	struct hci_mrvl_pkt pkt = (void )skb->data;
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct mrvl_data *mrvl = hu->priv;
	int ret = 0;

	if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
	bt_dev_err(hdev, "Corrupted mrvl header");
	mrvl_send_ack(hu, MRVL_NAK);
	ret = -EINVAL;
	goto done;
	}
	mrvl_send_ack(hu, MRVL_ACK);

	if (!test_bit(STATE_FW_REQ_PENDING, &mrvl->flags)) {
	bt_dev_err(hdev, "Received unexpected firmware request");
	ret = -EINVAL;
	goto done;
	}

	mrvl->tx_len = le16_to_cpu(pkt->lhs);

	clear_bit(STATE_FW_REQ_PENDING, &mrvl->flags);
	smp_mb__after_atomic();
	wake_up_bit(&mrvl->flags, STATE_FW_REQ_PENDING);

	done:
	kfree_skb(skb);
	return ret;
	}

	static int mrvl_recv_chip_ver(struct hci_dev hdev, struct sk_buff skb)
	{
	struct hci_mrvl_pkt pkt = (void )skb->data;
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct mrvl_data *mrvl = hu->priv;
	u16 version = le16_to_cpu(pkt->lhs);
	int ret = 0;

	if ((pkt->lhs ^ pkt->rhs) != 0xffff) {
	bt_dev_err(hdev, "Corrupted mrvl header");
	mrvl_send_ack(hu, MRVL_NAK);
	ret = -EINVAL;
	goto done;
	}
	mrvl_send_ack(hu, MRVL_ACK);

	if (!test_bit(STATE_CHIP_VER_PENDING, &mrvl->flags)) {
	bt_dev_err(hdev, "Received unexpected chip version");
	goto done;
	}

	mrvl->id = version;
	mrvl->rev = version >> 8;

	bt_dev_info(hdev, "Controller id = %x, rev = %x", mrvl->id, mrvl->rev);

	clear_bit(STATE_CHIP_VER_PENDING, &mrvl->flags);
	smp_mb__after_atomic();
	wake_up_bit(&mrvl->flags, STATE_CHIP_VER_PENDING);

	done:
	kfree_skb(skb);
	return ret;
	}

	#define HCI_RECV_CHIP_VER \
	.type = HCI_CHIP_VER_PKT, \
	.hlen = HCI_MRVL_PKT_SIZE, \
	.loff = 0, \
	.lsize = 0, \
	.maxlen = HCI_MRVL_PKT_SIZE

	#define HCI_RECV_FW_REQ \
	.type = HCI_FW_REQ_PKT, \
	.hlen = HCI_MRVL_PKT_SIZE, \
	.loff = 0, \
	.lsize = 0, \
	.maxlen = HCI_MRVL_PKT_SIZE

	static const struct h4_recv_pkt mrvl_recv_pkts[] = {
	{ H4_RECV_ACL, .recv = hci_recv_frame },
	{ H4_RECV_SCO, .recv = hci_recv_frame },
	{ H4_RECV_EVENT, .recv = hci_recv_frame },
	{ HCI_RECV_FW_REQ, .recv = mrvl_recv_fw_req },
	{ HCI_RECV_CHIP_VER, .recv = mrvl_recv_chip_ver },
	};

	static int mrvl_recv(struct hci_uart hu, const void data, int count)
	{
	struct mrvl_data *mrvl = hu->priv;

	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
	return -EUNATCH;

	mrvl->rx_skb = h4_recv_buf(hu->hdev, mrvl->rx_skb, data, count,
	mrvl_recv_pkts,
	ARRAY_SIZE(mrvl_recv_pkts));
	if (IS_ERR(mrvl->rx_skb)) {
	int err = PTR_ERR(mrvl->rx_skb);
	bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
	mrvl->rx_skb = NULL;
	return err;
	}

	return count;
	}

	static int mrvl_load_firmware(struct hci_dev hdev, const char name)
	{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct mrvl_data *mrvl = hu->priv;
	const struct firmware *fw = NULL;
	const u8 fw_ptr, fw_max;
	int err;

	err = request_firmware(&fw, name, &hdev->dev);
	if (err < 0) {
	bt_dev_err(hdev, "Failed to load firmware file %s", name);
	return err;
	}

	fw_ptr = fw->data;
	fw_max = fw->data + fw->size;

	bt_dev_info(hdev, "Loading %s", name);

	set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);

	while (fw_ptr <= fw_max) {
	struct sk_buff *skb;

	/* Controller drives the firmware load by sending firmware
	* request packets containing the expected fragment size.
	*/
	err = wait_on_bit_timeout(&mrvl->flags, STATE_FW_REQ_PENDING,
	TASK_INTERRUPTIBLE,
	msecs_to_jiffies(2000));
	if (err == 1) {
	bt_dev_err(hdev, "Firmware load interrupted");
	err = -EINTR;
	break;
	} else if (err) {
	bt_dev_err(hdev, "Firmware request timeout");
	err = -ETIMEDOUT;
	break;
	}

	bt_dev_dbg(hdev, "Firmware request, expecting %d bytes",
	mrvl->tx_len);

	if (fw_ptr == fw_max) {
	/* Controller requests a null size once firmware is
	* fully loaded. If controller expects more data, there
	* is an issue.
	*/
	if (!mrvl->tx_len) {
	bt_dev_info(hdev, "Firmware loading complete");
	} else {
	bt_dev_err(hdev, "Firmware loading failure");
	err = -EINVAL;
	}
	break;
	}

	if (fw_ptr + mrvl->tx_len > fw_max) {
	mrvl->tx_len = fw_max - fw_ptr;
	bt_dev_dbg(hdev, "Adjusting tx_len to %d",
	mrvl->tx_len);
	}

	skb = bt_skb_alloc(mrvl->tx_len, GFP_KERNEL);
	if (!skb) {
	bt_dev_err(hdev, "Failed to alloc mem for FW packet");
	err = -ENOMEM;
	break;
	}
	bt_cb(skb)->pkt_type = MRVL_RAW_DATA;

	skb_put_data(skb, fw_ptr, mrvl->tx_len);
	fw_ptr += mrvl->tx_len;

	set_bit(STATE_FW_REQ_PENDING, &mrvl->flags);

	skb_queue_tail(&mrvl->rawq, skb);
	hci_uart_tx_wakeup(hu);
	}

	release_firmware(fw);
	return err;
	}

	static int mrvl_setup(struct hci_uart *hu)
	{
	int err;

	hci_uart_set_flow_control(hu, true);

	err = mrvl_load_firmware(hu->hdev, "mrvl/helper_uart_3000000.bin");
	if (err) {
	bt_dev_err(hu->hdev, "Unable to download firmware helper");
	return -EINVAL;
	}

	/* Let the final ack go out before switching the baudrate */
	hci_uart_wait_until_sent(hu);

	if (hu->serdev)
	serdev_device_set_baudrate(hu->serdev, 3000000);
	else
	hci_uart_set_baudrate(hu, 3000000);

	hci_uart_set_flow_control(hu, false);

	err = mrvl_load_firmware(hu->hdev, "mrvl/uart8897_bt.bin");
	if (err)
	return err;

	return 0;
	}

	static const struct hci_uart_proto mrvl_proto = {
	.id = HCI_UART_MRVL,
	.name = "Marvell",
	.init_speed = 115200,
	.open = mrvl_open,
	.close = mrvl_close,
	.flush = mrvl_flush,
	.setup = mrvl_setup,
	.recv = mrvl_recv,
	.enqueue = mrvl_enqueue,
	.dequeue = mrvl_dequeue,
	};

	static int mrvl_serdev_probe(struct serdev_device *serdev)
	{
	struct mrvl_serdev *mrvldev;

	mrvldev = devm_kzalloc(&serdev->dev, sizeof(*mrvldev), GFP_KERNEL);
	if (!mrvldev)
	return -ENOMEM;

	mrvldev->hu.serdev = serdev;
	serdev_device_set_drvdata(serdev, mrvldev);

	return hci_uart_register_device(&mrvldev->hu, &mrvl_proto);
	}

	static void mrvl_serdev_remove(struct serdev_device *serdev)
	{
	struct mrvl_serdev *mrvldev = serdev_device_get_drvdata(serdev);

	hci_uart_unregister_device(&mrvldev->hu);
	}

	#ifdef CONFIG_OF
	static const struct of_device_id mrvl_bluetooth_of_match[] = {
	{ .compatible = "mrvl,88w8897" },
	{ },
	};
	MODULE_DEVICE_TABLE(of, mrvl_bluetooth_of_match);
	#endif

	static struct serdev_device_driver mrvl_serdev_driver = {
	.probe = mrvl_serdev_probe,
	.remove = mrvl_serdev_remove,
	.driver = {
	.name = "hci_uart_mrvl",
	.of_match_table = of_match_ptr(mrvl_bluetooth_of_match),
	},
	};

	int __init mrvl_init(void)
	{
	serdev_device_driver_register(&mrvl_serdev_driver);

	return hci_uart_register_proto(&mrvl_proto);
	}

	int __exit mrvl_deinit(void)
	{
	serdev_device_driver_unregister(&mrvl_serdev_driver);

	return hci_uart_unregister_proto(&mrvl_proto);
	}