Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1412 insertions, 0 deletions

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
new file mode 100644
index 0000000000..951fe3014a
--- /dev/null
+++ b/drivers/bluetooth/btnxpuart.c
@@ -0,0 +1,1412 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  NXP Bluetooth driver
+ *  Copyright 2023 NXP
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include <linux/serdev.h>
+#include <linux/of.h>
+#include <linux/skbuff.h>
+#include <asm/unaligned.h>
+#include <linux/firmware.h>
+#include <linux/string.h>
+#include <linux/crc8.h>
+#include <linux/crc32.h>
+#include <linux/string_helpers.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "h4_recv.h"
+
+#define MANUFACTURER_NXP		37
+
+#define BTNXPUART_TX_STATE_ACTIVE	1
+#define BTNXPUART_FW_DOWNLOADING	2
+#define BTNXPUART_CHECK_BOOT_SIGNATURE	3
+#define BTNXPUART_SERDEV_OPEN		4
+#define BTNXPUART_IR_IN_PROGRESS	5
+
+/* NXP HW err codes */
+#define BTNXPUART_IR_HW_ERR		0xb0
+
+#define FIRMWARE_W8987		"nxp/uartuart8987_bt.bin"
+#define FIRMWARE_W8997		"nxp/uartuart8997_bt_v4.bin"
+#define FIRMWARE_W9098		"nxp/uartuart9098_bt_v1.bin"
+#define FIRMWARE_IW416		"nxp/uartiw416_bt_v0.bin"
+#define FIRMWARE_IW612		"nxp/uartspi_n61x_v1.bin.se"
+#define FIRMWARE_IW624		"nxp/uartiw624_bt.bin"
+#define FIRMWARE_SECURE_IW624	"nxp/uartiw624_bt.bin.se"
+#define FIRMWARE_AW693		"nxp/uartaw693_bt.bin"
+#define FIRMWARE_SECURE_AW693	"nxp/uartaw693_bt.bin.se"
+#define FIRMWARE_HELPER		"nxp/helper_uart_3000000.bin"
+
+#define CHIP_ID_W9098		0x5c03
+#define CHIP_ID_IW416		0x7201
+#define CHIP_ID_IW612		0x7601
+#define CHIP_ID_IW624a		0x8000
+#define CHIP_ID_IW624c		0x8001
+#define CHIP_ID_AW693		0x8200
+
+#define FW_SECURE_MASK		0xc0
+#define FW_OPEN			0x00
+#define FW_AUTH_ILLEGAL		0x40
+#define FW_AUTH_PLAIN		0x80
+#define FW_AUTH_ENC		0xc0
+
+#define HCI_NXP_PRI_BAUDRATE	115200
+#define HCI_NXP_SEC_BAUDRATE	3000000
+
+#define MAX_FW_FILE_NAME_LEN    50
+
+/* Default ps timeout period in milliseconds */
+#define PS_DEFAULT_TIMEOUT_PERIOD_MS     2000
+
+/* wakeup methods */
+#define WAKEUP_METHOD_DTR       0
+#define WAKEUP_METHOD_BREAK     1
+#define WAKEUP_METHOD_EXT_BREAK 2
+#define WAKEUP_METHOD_RTS       3
+#define WAKEUP_METHOD_INVALID   0xff
+
+/* power save mode status */
+#define PS_MODE_DISABLE         0
+#define PS_MODE_ENABLE          1
+
+/* Power Save Commands to ps_work_func  */
+#define PS_CMD_EXIT_PS          1
+#define PS_CMD_ENTER_PS         2
+
+/* power save state */
+#define PS_STATE_AWAKE          0
+#define PS_STATE_SLEEP          1
+
+/* Bluetooth vendor command : Sleep mode */
+#define HCI_NXP_AUTO_SLEEP_MODE	0xfc23
+/* Bluetooth vendor command : Wakeup method */
+#define HCI_NXP_WAKEUP_METHOD	0xfc53
+/* Bluetooth vendor command : Set operational baudrate */
+#define HCI_NXP_SET_OPER_SPEED	0xfc09
+/* Bluetooth vendor command: Independent Reset */
+#define HCI_NXP_IND_RESET	0xfcfc
+
+/* Bluetooth Power State : Vendor cmd params */
+#define BT_PS_ENABLE			0x02
+#define BT_PS_DISABLE			0x03
+
+/* Bluetooth Host Wakeup Methods */
+#define BT_HOST_WAKEUP_METHOD_NONE      0x00
+#define BT_HOST_WAKEUP_METHOD_DTR       0x01
+#define BT_HOST_WAKEUP_METHOD_BREAK     0x02
+#define BT_HOST_WAKEUP_METHOD_GPIO      0x03
+
+/* Bluetooth Chip Wakeup Methods */
+#define BT_CTRL_WAKEUP_METHOD_DSR       0x00
+#define BT_CTRL_WAKEUP_METHOD_BREAK     0x01
+#define BT_CTRL_WAKEUP_METHOD_GPIO      0x02
+#define BT_CTRL_WAKEUP_METHOD_EXT_BREAK 0x04
+#define BT_CTRL_WAKEUP_METHOD_RTS       0x05
+
+struct ps_data {
+	u8    target_ps_mode;	/* ps mode to be set */
+	u8    cur_psmode;	/* current ps_mode */
+	u8    ps_state;		/* controller's power save state */
+	u8    ps_cmd;
+	u8    h2c_wakeupmode;
+	u8    cur_h2c_wakeupmode;
+	u8    c2h_wakeupmode;
+	u8    c2h_wakeup_gpio;
+	u8    h2c_wakeup_gpio;
+	bool  driver_sent_cmd;
+	u16   h2c_ps_interval;
+	u16   c2h_ps_interval;
+	struct hci_dev *hdev;
+	struct work_struct work;
+	struct timer_list ps_timer;
+};
+
+struct wakeup_cmd_payload {
+	u8 c2h_wakeupmode;
+	u8 c2h_wakeup_gpio;
+	u8 h2c_wakeupmode;
+	u8 h2c_wakeup_gpio;
+} __packed;
+
+struct psmode_cmd_payload {
+	u8 ps_cmd;
+	__le16 c2h_ps_interval;
+} __packed;
+
+struct btnxpuart_data {
+	const char *helper_fw_name;
+	const char *fw_name;
+};
+
+struct btnxpuart_dev {
+	struct hci_dev *hdev;
+	struct serdev_device *serdev;
+
+	struct work_struct tx_work;
+	unsigned long tx_state;
+	struct sk_buff_head txq;
+	struct sk_buff *rx_skb;
+
+	const struct firmware *fw;
+	u8 fw_name[MAX_FW_FILE_NAME_LEN];
+	u32 fw_dnld_v1_offset;
+	u32 fw_v1_sent_bytes;
+	u32 fw_v3_offset_correction;
+	u32 fw_v1_expected_len;
+	u32 boot_reg_offset;
+	wait_queue_head_t fw_dnld_done_wait_q;
+	wait_queue_head_t check_boot_sign_wait_q;
+
+	u32 new_baudrate;
+	u32 current_baudrate;
+	u32 fw_init_baudrate;
+	bool timeout_changed;
+	bool baudrate_changed;
+	bool helper_downloaded;
+
+	struct ps_data psdata;
+	struct btnxpuart_data *nxp_data;
+};
+
+#define NXP_V1_FW_REQ_PKT	0xa5
+#define NXP_V1_CHIP_VER_PKT	0xaa
+#define NXP_V3_FW_REQ_PKT	0xa7
+#define NXP_V3_CHIP_VER_PKT	0xab
+
+#define NXP_ACK_V1		0x5a
+#define NXP_NAK_V1		0xbf
+#define NXP_ACK_V3		0x7a
+#define NXP_NAK_V3		0x7b
+#define NXP_CRC_ERROR_V3	0x7c
+
+#define HDR_LEN			16
+
+#define NXP_RECV_CHIP_VER_V1 \
+	.type = NXP_V1_CHIP_VER_PKT, \
+	.hlen = 4, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = 4
+
+#define NXP_RECV_FW_REQ_V1 \
+	.type = NXP_V1_FW_REQ_PKT, \
+	.hlen = 4, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = 4
+
+#define NXP_RECV_CHIP_VER_V3 \
+	.type = NXP_V3_CHIP_VER_PKT, \
+	.hlen = 4, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = 4
+
+#define NXP_RECV_FW_REQ_V3 \
+	.type = NXP_V3_FW_REQ_PKT, \
+	.hlen = 9, \
+	.loff = 0, \
+	.lsize = 0, \
+	.maxlen = 9
+
+struct v1_data_req {
+	__le16 len;
+	__le16 len_comp;
+} __packed;
+
+struct v1_start_ind {
+	__le16 chip_id;
+	__le16 chip_id_comp;
+} __packed;
+
+struct v3_data_req {
+	__le16 len;
+	__le32 offset;
+	__le16 error;
+	u8 crc;
+} __packed;
+
+struct v3_start_ind {
+	__le16 chip_id;
+	u8 loader_ver;
+	u8 crc;
+} __packed;
+
+/* UART register addresses of BT chip */
+#define CLKDIVADDR	0x7f00008f
+#define UARTDIVADDR	0x7f000090
+#define UARTMCRADDR	0x7f000091
+#define UARTREINITADDR	0x7f000092
+#define UARTICRADDR	0x7f000093
+#define UARTFCRADDR	0x7f000094
+
+#define MCR		0x00000022
+#define INIT		0x00000001
+#define ICR		0x000000c7
+#define FCR		0x000000c7
+
+#define POLYNOMIAL8	0x07
+
+struct uart_reg {
+	__le32 address;
+	__le32 value;
+} __packed;
+
+struct uart_config {
+	struct uart_reg clkdiv;
+	struct uart_reg uartdiv;
+	struct uart_reg mcr;
+	struct uart_reg re_init;
+	struct uart_reg icr;
+	struct uart_reg fcr;
+	__be32 crc;
+} __packed;
+
+struct nxp_bootloader_cmd {
+	__le32 header;
+	__le32 arg;
+	__le32 payload_len;
+	__be32 crc;
+} __packed;
+
+static u8 crc8_table[CRC8_TABLE_SIZE];
+
+/* Default configurations */
+#define DEFAULT_H2C_WAKEUP_MODE	WAKEUP_METHOD_BREAK
+#define DEFAULT_PS_MODE		PS_MODE_DISABLE
+#define FW_INIT_BAUDRATE	HCI_NXP_PRI_BAUDRATE
+
+static struct sk_buff *nxp_drv_send_cmd(struct hci_dev *hdev, u16 opcode,
+					u32 plen,
+					void *param)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct ps_data *psdata = &nxpdev->psdata;
+	struct sk_buff *skb;
+
+	/* set flag to prevent nxp_enqueue from parsing values from this command and
+	 * calling hci_cmd_sync_queue() again.
+	 */
+	psdata->driver_sent_cmd = true;
+	skb = __hci_cmd_sync(hdev, opcode, plen, param, HCI_CMD_TIMEOUT);
+	psdata->driver_sent_cmd = false;
+
+	return skb;
+}
+
+static void btnxpuart_tx_wakeup(struct btnxpuart_dev *nxpdev)
+{
+	if (schedule_work(&nxpdev->tx_work))
+		set_bit(BTNXPUART_TX_STATE_ACTIVE, &nxpdev->tx_state);
+}
+
+/* NXP Power Save Feature */
+static void ps_start_timer(struct btnxpuart_dev *nxpdev)
+{
+	struct ps_data *psdata = &nxpdev->psdata;
+
+	if (!psdata)
+		return;
+
+	if (psdata->cur_psmode == PS_MODE_ENABLE)
+		mod_timer(&psdata->ps_timer, jiffies + msecs_to_jiffies(psdata->h2c_ps_interval));
+}
+
+static void ps_cancel_timer(struct btnxpuart_dev *nxpdev)
+{
+	struct ps_data *psdata = &nxpdev->psdata;
+
+	flush_work(&psdata->work);
+	del_timer_sync(&psdata->ps_timer);
+}
+
+static void ps_control(struct hci_dev *hdev, u8 ps_state)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct ps_data *psdata = &nxpdev->psdata;
+	int status;
+
+	if (psdata->ps_state == ps_state ||
+	    !test_bit(BTNXPUART_SERDEV_OPEN, &nxpdev->tx_state))
+		return;
+
+	switch (psdata->cur_h2c_wakeupmode) {
+	case WAKEUP_METHOD_DTR:
+		if (ps_state == PS_STATE_AWAKE)
+			status = serdev_device_set_tiocm(nxpdev->serdev, TIOCM_DTR, 0);
+		else
+			status = serdev_device_set_tiocm(nxpdev->serdev, 0, TIOCM_DTR);
+		break;
+	case WAKEUP_METHOD_BREAK:
+	default:
+		if (ps_state == PS_STATE_AWAKE)
+			status = serdev_device_break_ctl(nxpdev->serdev, 0);
+		else
+			status = serdev_device_break_ctl(nxpdev->serdev, -1);
+		bt_dev_dbg(hdev, "Set UART break: %s, status=%d",
+			   str_on_off(ps_state == PS_STATE_SLEEP), status);
+		break;
+	}
+	if (!status)
+		psdata->ps_state = ps_state;
+	if (ps_state == PS_STATE_AWAKE)
+		btnxpuart_tx_wakeup(nxpdev);
+}
+
+static void ps_work_func(struct work_struct *work)
+{
+	struct ps_data *data = container_of(work, struct ps_data, work);
+
+	if (data->ps_cmd == PS_CMD_ENTER_PS && data->cur_psmode == PS_MODE_ENABLE)
+		ps_control(data->hdev, PS_STATE_SLEEP);
+	else if (data->ps_cmd == PS_CMD_EXIT_PS)
+		ps_control(data->hdev, PS_STATE_AWAKE);
+}
+
+static void ps_timeout_func(struct timer_list *t)
+{
+	struct ps_data *data = from_timer(data, t, ps_timer);
+	struct hci_dev *hdev = data->hdev;
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+
+	if (test_bit(BTNXPUART_TX_STATE_ACTIVE, &nxpdev->tx_state)) {
+		ps_start_timer(nxpdev);
+	} else {
+		data->ps_cmd = PS_CMD_ENTER_PS;
+		schedule_work(&data->work);
+	}
+}
+
+static void ps_setup(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct ps_data *psdata = &nxpdev->psdata;
+
+	psdata->hdev = hdev;
+	INIT_WORK(&psdata->work, ps_work_func);
+	timer_setup(&psdata->ps_timer, ps_timeout_func, 0);
+}
+
+static void ps_wakeup(struct btnxpuart_dev *nxpdev)
+{
+	struct ps_data *psdata = &nxpdev->psdata;
+
+	if (psdata->ps_state != PS_STATE_AWAKE) {
+		psdata->ps_cmd = PS_CMD_EXIT_PS;
+		schedule_work(&psdata->work);
+	}
+}
+
+static int send_ps_cmd(struct hci_dev *hdev, void *data)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct ps_data *psdata = &nxpdev->psdata;
+	struct psmode_cmd_payload pcmd;
+	struct sk_buff *skb;
+	u8 *status;
+
+	if (psdata->target_ps_mode == PS_MODE_ENABLE)
+		pcmd.ps_cmd = BT_PS_ENABLE;
+	else
+		pcmd.ps_cmd = BT_PS_DISABLE;
+	pcmd.c2h_ps_interval = __cpu_to_le16(psdata->c2h_ps_interval);
+
+	skb = nxp_drv_send_cmd(hdev, HCI_NXP_AUTO_SLEEP_MODE, sizeof(pcmd), &pcmd);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Setting Power Save mode failed (%ld)", PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	status = skb_pull_data(skb, 1);
+	if (status) {
+		if (!*status)
+			psdata->cur_psmode = psdata->target_ps_mode;
+		else
+			psdata->target_ps_mode = psdata->cur_psmode;
+		if (psdata->cur_psmode == PS_MODE_ENABLE)
+			ps_start_timer(nxpdev);
+		else
+			ps_wakeup(nxpdev);
+		bt_dev_dbg(hdev, "Power Save mode response: status=%d, ps_mode=%d",
+			   *status, psdata->cur_psmode);
+	}
+	kfree_skb(skb);
+
+	return 0;
+}
+
+static int send_wakeup_method_cmd(struct hci_dev *hdev, void *data)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct ps_data *psdata = &nxpdev->psdata;
+	struct wakeup_cmd_payload pcmd;
+	struct sk_buff *skb;
+	u8 *status;
+
+	pcmd.c2h_wakeupmode = psdata->c2h_wakeupmode;
+	pcmd.c2h_wakeup_gpio = psdata->c2h_wakeup_gpio;
+	switch (psdata->h2c_wakeupmode) {
+	case WAKEUP_METHOD_DTR:
+		pcmd.h2c_wakeupmode = BT_CTRL_WAKEUP_METHOD_DSR;
+		break;
+	case WAKEUP_METHOD_BREAK:
+	default:
+		pcmd.h2c_wakeupmode = BT_CTRL_WAKEUP_METHOD_BREAK;
+		break;
+	}
+	pcmd.h2c_wakeup_gpio = 0xff;
+
+	skb = nxp_drv_send_cmd(hdev, HCI_NXP_WAKEUP_METHOD, sizeof(pcmd), &pcmd);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Setting wake-up method failed (%ld)", PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	status = skb_pull_data(skb, 1);
+	if (status) {
+		if (*status == 0)
+			psdata->cur_h2c_wakeupmode = psdata->h2c_wakeupmode;
+		else
+			psdata->h2c_wakeupmode = psdata->cur_h2c_wakeupmode;
+		bt_dev_dbg(hdev, "Set Wakeup Method response: status=%d, h2c_wakeupmode=%d",
+			   *status, psdata->cur_h2c_wakeupmode);
+	}
+	kfree_skb(skb);
+
+	return 0;
+}
+
+static void ps_init(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct ps_data *psdata = &nxpdev->psdata;
+
+	serdev_device_set_tiocm(nxpdev->serdev, 0, TIOCM_RTS);
+	usleep_range(5000, 10000);
+	serdev_device_set_tiocm(nxpdev->serdev, TIOCM_RTS, 0);
+	usleep_range(5000, 10000);
+
+	psdata->ps_state = PS_STATE_AWAKE;
+	psdata->c2h_wakeupmode = BT_HOST_WAKEUP_METHOD_NONE;
+	psdata->c2h_wakeup_gpio = 0xff;
+
+	psdata->cur_h2c_wakeupmode = WAKEUP_METHOD_INVALID;
+	psdata->h2c_ps_interval = PS_DEFAULT_TIMEOUT_PERIOD_MS;
+	switch (DEFAULT_H2C_WAKEUP_MODE) {
+	case WAKEUP_METHOD_DTR:
+		psdata->h2c_wakeupmode = WAKEUP_METHOD_DTR;
+		serdev_device_set_tiocm(nxpdev->serdev, 0, TIOCM_DTR);
+		serdev_device_set_tiocm(nxpdev->serdev, TIOCM_DTR, 0);
+		break;
+	case WAKEUP_METHOD_BREAK:
+	default:
+		psdata->h2c_wakeupmode = WAKEUP_METHOD_BREAK;
+		serdev_device_break_ctl(nxpdev->serdev, -1);
+		usleep_range(5000, 10000);
+		serdev_device_break_ctl(nxpdev->serdev, 0);
+		usleep_range(5000, 10000);
+		break;
+	}
+
+	psdata->cur_psmode = PS_MODE_DISABLE;
+	psdata->target_ps_mode = DEFAULT_PS_MODE;
+
+	if (psdata->cur_h2c_wakeupmode != psdata->h2c_wakeupmode)
+		hci_cmd_sync_queue(hdev, send_wakeup_method_cmd, NULL, NULL);
+	if (psdata->cur_psmode != psdata->target_ps_mode)
+		hci_cmd_sync_queue(hdev, send_ps_cmd, NULL, NULL);
+}
+
+/* NXP Firmware Download Feature */
+static int nxp_download_firmware(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	int err = 0;
+
+	nxpdev->fw_dnld_v1_offset = 0;
+	nxpdev->fw_v1_sent_bytes = 0;
+	nxpdev->fw_v1_expected_len = HDR_LEN;
+	nxpdev->boot_reg_offset = 0;
+	nxpdev->fw_v3_offset_correction = 0;
+	nxpdev->baudrate_changed = false;
+	nxpdev->timeout_changed = false;
+	nxpdev->helper_downloaded = false;
+
+	serdev_device_set_baudrate(nxpdev->serdev, HCI_NXP_PRI_BAUDRATE);
+	serdev_device_set_flow_control(nxpdev->serdev, false);
+	nxpdev->current_baudrate = HCI_NXP_PRI_BAUDRATE;
+
+	/* Wait till FW is downloaded */
+	err = wait_event_interruptible_timeout(nxpdev->fw_dnld_done_wait_q,
+					       !test_bit(BTNXPUART_FW_DOWNLOADING,
+							 &nxpdev->tx_state),
+					       msecs_to_jiffies(60000));
+	if (err == 0) {
+		bt_dev_err(hdev, "FW Download Timeout.");
+		return -ETIMEDOUT;
+	}
+
+	serdev_device_set_flow_control(nxpdev->serdev, true);
+	release_firmware(nxpdev->fw);
+	memset(nxpdev->fw_name, 0, sizeof(nxpdev->fw_name));
+
+	/* Allow the downloaded FW to initialize */
+	msleep(1200);
+
+	return 0;
+}
+
+static void nxp_send_ack(u8 ack, struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	u8 ack_nak[2];
+	int len = 1;
+
+	ack_nak[0] = ack;
+	if (ack == NXP_ACK_V3) {
+		ack_nak[1] = crc8(crc8_table, ack_nak, 1, 0xff);
+		len = 2;
+	}
+	serdev_device_write_buf(nxpdev->serdev, ack_nak, len);
+}
+
+static bool nxp_fw_change_baudrate(struct hci_dev *hdev, u16 req_len)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct nxp_bootloader_cmd nxp_cmd5;
+	struct uart_config uart_config;
+	u32 clkdivaddr = CLKDIVADDR - nxpdev->boot_reg_offset;
+	u32 uartdivaddr = UARTDIVADDR - nxpdev->boot_reg_offset;
+	u32 uartmcraddr = UARTMCRADDR - nxpdev->boot_reg_offset;
+	u32 uartreinitaddr = UARTREINITADDR - nxpdev->boot_reg_offset;
+	u32 uarticraddr = UARTICRADDR - nxpdev->boot_reg_offset;
+	u32 uartfcraddr = UARTFCRADDR - nxpdev->boot_reg_offset;
+
+	if (req_len == sizeof(nxp_cmd5)) {
+		nxp_cmd5.header = __cpu_to_le32(5);
+		nxp_cmd5.arg = 0;
+		nxp_cmd5.payload_len = __cpu_to_le32(sizeof(uart_config));
+		/* FW expects swapped CRC bytes */
+		nxp_cmd5.crc = __cpu_to_be32(crc32_be(0UL, (char *)&nxp_cmd5,
+						      sizeof(nxp_cmd5) - 4));
+
+		serdev_device_write_buf(nxpdev->serdev, (u8 *)&nxp_cmd5, sizeof(nxp_cmd5));
+		nxpdev->fw_v3_offset_correction += req_len;
+	} else if (req_len == sizeof(uart_config)) {
+		uart_config.clkdiv.address = __cpu_to_le32(clkdivaddr);
+		uart_config.clkdiv.value = __cpu_to_le32(0x00c00000);
+		uart_config.uartdiv.address = __cpu_to_le32(uartdivaddr);
+		uart_config.uartdiv.value = __cpu_to_le32(1);
+		uart_config.mcr.address = __cpu_to_le32(uartmcraddr);
+		uart_config.mcr.value = __cpu_to_le32(MCR);
+		uart_config.re_init.address = __cpu_to_le32(uartreinitaddr);
+		uart_config.re_init.value = __cpu_to_le32(INIT);
+		uart_config.icr.address = __cpu_to_le32(uarticraddr);
+		uart_config.icr.value = __cpu_to_le32(ICR);
+		uart_config.fcr.address = __cpu_to_le32(uartfcraddr);
+		uart_config.fcr.value = __cpu_to_le32(FCR);
+		/* FW expects swapped CRC bytes */
+		uart_config.crc = __cpu_to_be32(crc32_be(0UL, (char *)&uart_config,
+							 sizeof(uart_config) - 4));
+
+		serdev_device_write_buf(nxpdev->serdev, (u8 *)&uart_config, sizeof(uart_config));
+		serdev_device_wait_until_sent(nxpdev->serdev, 0);
+		nxpdev->fw_v3_offset_correction += req_len;
+		return true;
+	}
+	return false;
+}
+
+static bool nxp_fw_change_timeout(struct hci_dev *hdev, u16 req_len)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct nxp_bootloader_cmd nxp_cmd7;
+
+	if (req_len != sizeof(nxp_cmd7))
+		return false;
+
+	nxp_cmd7.header = __cpu_to_le32(7);
+	nxp_cmd7.arg = __cpu_to_le32(0x70);
+	nxp_cmd7.payload_len = 0;
+	/* FW expects swapped CRC bytes */
+	nxp_cmd7.crc = __cpu_to_be32(crc32_be(0UL, (char *)&nxp_cmd7,
+					      sizeof(nxp_cmd7) - 4));
+	serdev_device_write_buf(nxpdev->serdev, (u8 *)&nxp_cmd7, sizeof(nxp_cmd7));
+	serdev_device_wait_until_sent(nxpdev->serdev, 0);
+	nxpdev->fw_v3_offset_correction += req_len;
+	return true;
+}
+
+static u32 nxp_get_data_len(const u8 *buf)
+{
+	struct nxp_bootloader_cmd *hdr = (struct nxp_bootloader_cmd *)buf;
+
+	return __le32_to_cpu(hdr->payload_len);
+}
+
+static bool is_fw_downloading(struct btnxpuart_dev *nxpdev)
+{
+	return test_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
+}
+
+static bool process_boot_signature(struct btnxpuart_dev *nxpdev)
+{
+	if (test_bit(BTNXPUART_CHECK_BOOT_SIGNATURE, &nxpdev->tx_state)) {
+		clear_bit(BTNXPUART_CHECK_BOOT_SIGNATURE, &nxpdev->tx_state);
+		wake_up_interruptible(&nxpdev->check_boot_sign_wait_q);
+		return false;
+	}
+	return is_fw_downloading(nxpdev);
+}
+
+static int nxp_request_firmware(struct hci_dev *hdev, const char *fw_name)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	int err = 0;
+
+	if (!fw_name)
+		return -ENOENT;
+
+	if (!strlen(nxpdev->fw_name)) {
+		snprintf(nxpdev->fw_name, MAX_FW_FILE_NAME_LEN, "%s", fw_name);
+
+		bt_dev_dbg(hdev, "Request Firmware: %s", nxpdev->fw_name);
+		err = request_firmware(&nxpdev->fw, nxpdev->fw_name, &hdev->dev);
+		if (err < 0) {
+			bt_dev_err(hdev, "Firmware file %s not found", nxpdev->fw_name);
+			clear_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
+		}
+	}
+	return err;
+}
+
+/* for legacy chipsets with V1 bootloader */
+static int nxp_recv_chip_ver_v1(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct v1_start_ind *req;
+	__u16 chip_id;
+
+	req = skb_pull_data(skb, sizeof(*req));
+	if (!req)
+		goto free_skb;
+
+	chip_id = le16_to_cpu(req->chip_id ^ req->chip_id_comp);
+	if (chip_id == 0xffff && nxpdev->fw_dnld_v1_offset) {
+		nxpdev->fw_dnld_v1_offset = 0;
+		nxpdev->fw_v1_sent_bytes = 0;
+		nxpdev->fw_v1_expected_len = HDR_LEN;
+		release_firmware(nxpdev->fw);
+		memset(nxpdev->fw_name, 0, sizeof(nxpdev->fw_name));
+		nxp_send_ack(NXP_ACK_V1, hdev);
+	}
+
+free_skb:
+	kfree_skb(skb);
+	return 0;
+}
+
+static int nxp_recv_fw_req_v1(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct btnxpuart_data *nxp_data = nxpdev->nxp_data;
+	struct v1_data_req *req;
+	__u16 len;
+
+	if (!process_boot_signature(nxpdev))
+		goto free_skb;
+
+	req = skb_pull_data(skb, sizeof(*req));
+	if (!req)
+		goto free_skb;
+
+	len = __le16_to_cpu(req->len ^ req->len_comp);
+	if (len != 0xffff) {
+		bt_dev_dbg(hdev, "ERR: Send NAK");
+		nxp_send_ack(NXP_NAK_V1, hdev);
+		goto free_skb;
+	}
+	nxp_send_ack(NXP_ACK_V1, hdev);
+
+	len = __le16_to_cpu(req->len);
+
+	if (!nxp_data->helper_fw_name) {
+		if (!nxpdev->timeout_changed) {
+			nxpdev->timeout_changed = nxp_fw_change_timeout(hdev,
+									len);
+			goto free_skb;
+		}
+		if (!nxpdev->baudrate_changed) {
+			nxpdev->baudrate_changed = nxp_fw_change_baudrate(hdev,
+									  len);
+			if (nxpdev->baudrate_changed) {
+				serdev_device_set_baudrate(nxpdev->serdev,
+							   HCI_NXP_SEC_BAUDRATE);
+				serdev_device_set_flow_control(nxpdev->serdev, true);
+				nxpdev->current_baudrate = HCI_NXP_SEC_BAUDRATE;
+			}
+			goto free_skb;
+		}
+	}
+
+	if (!nxp_data->helper_fw_name || nxpdev->helper_downloaded) {
+		if (nxp_request_firmware(hdev, nxp_data->fw_name))
+			goto free_skb;
+	} else if (nxp_data->helper_fw_name && !nxpdev->helper_downloaded) {
+		if (nxp_request_firmware(hdev, nxp_data->helper_fw_name))
+			goto free_skb;
+	}
+
+	if (!len) {
+		bt_dev_dbg(hdev, "FW Downloaded Successfully: %zu bytes",
+			   nxpdev->fw->size);
+		if (nxp_data->helper_fw_name && !nxpdev->helper_downloaded) {
+			nxpdev->helper_downloaded = true;
+			serdev_device_wait_until_sent(nxpdev->serdev, 0);
+			serdev_device_set_baudrate(nxpdev->serdev,
+						   HCI_NXP_SEC_BAUDRATE);
+			serdev_device_set_flow_control(nxpdev->serdev, true);
+		} else {
+			clear_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
+			wake_up_interruptible(&nxpdev->fw_dnld_done_wait_q);
+		}
+		goto free_skb;
+	}
+	if (len & 0x01) {
+		/* The CRC did not match at the other end.
+		 * Simply send the same bytes again.
+		 */
+		len = nxpdev->fw_v1_sent_bytes;
+		bt_dev_dbg(hdev, "CRC error. Resend %d bytes of FW.", len);
+	} else {
+		nxpdev->fw_dnld_v1_offset += nxpdev->fw_v1_sent_bytes;
+
+		/* The FW bin file is made up of many blocks of
+		 * 16 byte header and payload data chunks. If the
+		 * FW has requested a header, read the payload length
+		 * info from the header, before sending the header.
+		 * In the next iteration, the FW should request the
+		 * payload data chunk, which should be equal to the
+		 * payload length read from header. If there is a
+		 * mismatch, clearly the driver and FW are out of sync,
+		 * and we need to re-send the previous header again.
+		 */
+		if (len == nxpdev->fw_v1_expected_len) {
+			if (len == HDR_LEN)
+				nxpdev->fw_v1_expected_len = nxp_get_data_len(nxpdev->fw->data +
+									nxpdev->fw_dnld_v1_offset);
+			else
+				nxpdev->fw_v1_expected_len = HDR_LEN;
+		} else if (len == HDR_LEN) {
+			/* FW download out of sync. Send previous chunk again */
+			nxpdev->fw_dnld_v1_offset -= nxpdev->fw_v1_sent_bytes;
+			nxpdev->fw_v1_expected_len = HDR_LEN;
+		}
+	}
+
+	if (nxpdev->fw_dnld_v1_offset + len <= nxpdev->fw->size)
+		serdev_device_write_buf(nxpdev->serdev, nxpdev->fw->data +
+					nxpdev->fw_dnld_v1_offset, len);
+	nxpdev->fw_v1_sent_bytes = len;
+
+free_skb:
+	kfree_skb(skb);
+	return 0;
+}
+
+static char *nxp_get_fw_name_from_chipid(struct hci_dev *hdev, u16 chipid,
+					 u8 loader_ver)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	char *fw_name = NULL;
+
+	switch (chipid) {
+	case CHIP_ID_W9098:
+		fw_name = FIRMWARE_W9098;
+		break;
+	case CHIP_ID_IW416:
+		fw_name = FIRMWARE_IW416;
+		break;
+	case CHIP_ID_IW612:
+		fw_name = FIRMWARE_IW612;
+		break;
+	case CHIP_ID_IW624a:
+	case CHIP_ID_IW624c:
+		nxpdev->boot_reg_offset = 1;
+		if ((loader_ver & FW_SECURE_MASK) == FW_OPEN)
+			fw_name = FIRMWARE_IW624;
+		else if ((loader_ver & FW_SECURE_MASK) != FW_AUTH_ILLEGAL)
+			fw_name = FIRMWARE_SECURE_IW624;
+		else
+			bt_dev_err(hdev, "Illegal loader version %02x", loader_ver);
+		break;
+	case CHIP_ID_AW693:
+		if ((loader_ver & FW_SECURE_MASK) == FW_OPEN)
+			fw_name = FIRMWARE_AW693;
+		else if ((loader_ver & FW_SECURE_MASK) != FW_AUTH_ILLEGAL)
+			fw_name = FIRMWARE_SECURE_AW693;
+		else
+			bt_dev_err(hdev, "Illegal loader version %02x", loader_ver);
+		break;
+	default:
+		bt_dev_err(hdev, "Unknown chip signature %04x", chipid);
+		break;
+	}
+	return fw_name;
+}
+
+static int nxp_recv_chip_ver_v3(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct v3_start_ind *req = skb_pull_data(skb, sizeof(*req));
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	u16 chip_id;
+	u8 loader_ver;
+
+	if (!process_boot_signature(nxpdev))
+		goto free_skb;
+
+	chip_id = le16_to_cpu(req->chip_id);
+	loader_ver = req->loader_ver;
+	if (!nxp_request_firmware(hdev, nxp_get_fw_name_from_chipid(hdev,
+								    chip_id, loader_ver)))
+		nxp_send_ack(NXP_ACK_V3, hdev);
+
+free_skb:
+	kfree_skb(skb);
+	return 0;
+}
+
+static int nxp_recv_fw_req_v3(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct v3_data_req *req;
+	__u16 len;
+	__u32 offset;
+
+	if (!process_boot_signature(nxpdev))
+		goto free_skb;
+
+	req = skb_pull_data(skb, sizeof(*req));
+	if (!req || !nxpdev->fw)
+		goto free_skb;
+
+	nxp_send_ack(NXP_ACK_V3, hdev);
+
+	len = __le16_to_cpu(req->len);
+
+	if (!nxpdev->timeout_changed) {
+		nxpdev->timeout_changed = nxp_fw_change_timeout(hdev, len);
+		goto free_skb;
+	}
+
+	if (!nxpdev->baudrate_changed) {
+		nxpdev->baudrate_changed = nxp_fw_change_baudrate(hdev, len);
+		if (nxpdev->baudrate_changed) {
+			serdev_device_set_baudrate(nxpdev->serdev,
+						   HCI_NXP_SEC_BAUDRATE);
+			serdev_device_set_flow_control(nxpdev->serdev, true);
+			nxpdev->current_baudrate = HCI_NXP_SEC_BAUDRATE;
+		}
+		goto free_skb;
+	}
+
+	if (req->len == 0) {
+		bt_dev_dbg(hdev, "FW Downloaded Successfully: %zu bytes",
+			   nxpdev->fw->size);
+		clear_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
+		wake_up_interruptible(&nxpdev->fw_dnld_done_wait_q);
+		goto free_skb;
+	}
+	if (req->error)
+		bt_dev_dbg(hdev, "FW Download received err 0x%02x from chip",
+			   req->error);
+
+	offset = __le32_to_cpu(req->offset);
+	if (offset < nxpdev->fw_v3_offset_correction) {
+		/* This scenario should ideally never occur. But if it ever does,
+		 * FW is out of sync and needs a power cycle.
+		 */
+		bt_dev_err(hdev, "Something went wrong during FW download");
+		bt_dev_err(hdev, "Please power cycle and try again");
+		goto free_skb;
+	}
+
+	serdev_device_write_buf(nxpdev->serdev, nxpdev->fw->data + offset -
+				nxpdev->fw_v3_offset_correction, len);
+
+free_skb:
+	kfree_skb(skb);
+	return 0;
+}
+
+static int nxp_set_baudrate_cmd(struct hci_dev *hdev, void *data)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	__le32 new_baudrate = __cpu_to_le32(nxpdev->new_baudrate);
+	struct ps_data *psdata = &nxpdev->psdata;
+	struct sk_buff *skb;
+	u8 *status;
+
+	if (!psdata)
+		return 0;
+
+	skb = nxp_drv_send_cmd(hdev, HCI_NXP_SET_OPER_SPEED, 4, (u8 *)&new_baudrate);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "Setting baudrate failed (%ld)", PTR_ERR(skb));
+		return PTR_ERR(skb);
+	}
+
+	status = (u8 *)skb_pull_data(skb, 1);
+	if (status) {
+		if (*status == 0) {
+			serdev_device_set_baudrate(nxpdev->serdev, nxpdev->new_baudrate);
+			nxpdev->current_baudrate = nxpdev->new_baudrate;
+		}
+		bt_dev_dbg(hdev, "Set baudrate response: status=%d, baudrate=%d",
+			   *status, nxpdev->new_baudrate);
+	}
+	kfree_skb(skb);
+
+	return 0;
+}
+
+static int nxp_check_boot_sign(struct btnxpuart_dev *nxpdev)
+{
+	serdev_device_set_baudrate(nxpdev->serdev, HCI_NXP_PRI_BAUDRATE);
+	if (test_bit(BTNXPUART_IR_IN_PROGRESS, &nxpdev->tx_state))
+		serdev_device_set_flow_control(nxpdev->serdev, false);
+	else
+		serdev_device_set_flow_control(nxpdev->serdev, true);
+	set_bit(BTNXPUART_CHECK_BOOT_SIGNATURE, &nxpdev->tx_state);
+
+	return wait_event_interruptible_timeout(nxpdev->check_boot_sign_wait_q,
+					       !test_bit(BTNXPUART_CHECK_BOOT_SIGNATURE,
+							 &nxpdev->tx_state),
+					       msecs_to_jiffies(1000));
+}
+
+static int nxp_set_ind_reset(struct hci_dev *hdev, void *data)
+{
+	static const u8 ir_hw_err[] = { HCI_EV_HARDWARE_ERROR,
+					0x01, BTNXPUART_IR_HW_ERR };
+	struct sk_buff *skb;
+
+	skb = bt_skb_alloc(3, GFP_ATOMIC);
+	if (!skb)
+		return -ENOMEM;
+
+	hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
+	skb_put_data(skb, ir_hw_err, 3);
+
+	/* Inject Hardware Error to upper stack */
+	return hci_recv_frame(hdev, skb);
+}
+
+/* NXP protocol */
+static int nxp_setup(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	int err = 0;
+
+	if (nxp_check_boot_sign(nxpdev)) {
+		bt_dev_dbg(hdev, "Need FW Download.");
+		err = nxp_download_firmware(hdev);
+		if (err < 0)
+			return err;
+	} else {
+		bt_dev_dbg(hdev, "FW already running.");
+		clear_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
+	}
+
+	serdev_device_set_baudrate(nxpdev->serdev, nxpdev->fw_init_baudrate);
+	nxpdev->current_baudrate = nxpdev->fw_init_baudrate;
+
+	if (nxpdev->current_baudrate != HCI_NXP_SEC_BAUDRATE) {
+		nxpdev->new_baudrate = HCI_NXP_SEC_BAUDRATE;
+		hci_cmd_sync_queue(hdev, nxp_set_baudrate_cmd, NULL, NULL);
+	}
+
+	ps_init(hdev);
+
+	if (test_and_clear_bit(BTNXPUART_IR_IN_PROGRESS, &nxpdev->tx_state))
+		hci_dev_clear_flag(hdev, HCI_SETUP);
+
+	return 0;
+}
+
+static void nxp_hw_err(struct hci_dev *hdev, u8 code)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+
+	switch (code) {
+	case BTNXPUART_IR_HW_ERR:
+		set_bit(BTNXPUART_IR_IN_PROGRESS, &nxpdev->tx_state);
+		hci_dev_set_flag(hdev, HCI_SETUP);
+		break;
+	default:
+		break;
+	}
+}
+
+static int nxp_shutdown(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct sk_buff *skb;
+	u8 *status;
+	u8 pcmd = 0;
+
+	if (test_bit(BTNXPUART_IR_IN_PROGRESS, &nxpdev->tx_state)) {
+		skb = nxp_drv_send_cmd(hdev, HCI_NXP_IND_RESET, 1, &pcmd);
+		if (IS_ERR(skb))
+			return PTR_ERR(skb);
+
+		status = skb_pull_data(skb, 1);
+		if (status) {
+			serdev_device_set_flow_control(nxpdev->serdev, false);
+			set_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
+		}
+		kfree_skb(skb);
+	}
+
+	return 0;
+}
+
+static int btnxpuart_queue_skb(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+
+	/* Prepend skb with frame type */
+	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
+	skb_queue_tail(&nxpdev->txq, skb);
+	btnxpuart_tx_wakeup(nxpdev);
+	return 0;
+}
+
+static int nxp_enqueue(struct hci_dev *hdev, struct sk_buff *skb)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	struct ps_data *psdata = &nxpdev->psdata;
+	struct hci_command_hdr *hdr;
+	struct psmode_cmd_payload ps_parm;
+	struct wakeup_cmd_payload wakeup_parm;
+	__le32 baudrate_parm;
+
+	/* if vendor commands are received from user space (e.g. hcitool), update
+	 * driver flags accordingly and ask driver to re-send the command to FW.
+	 * In case the payload for any command does not match expected payload
+	 * length, let the firmware and user space program handle it, or throw
+	 * an error.
+	 */
+	if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT && !psdata->driver_sent_cmd) {
+		hdr = (struct hci_command_hdr *)skb->data;
+		if (hdr->plen != (skb->len - HCI_COMMAND_HDR_SIZE))
+			return btnxpuart_queue_skb(hdev, skb);
+
+		switch (__le16_to_cpu(hdr->opcode)) {
+		case HCI_NXP_AUTO_SLEEP_MODE:
+			if (hdr->plen == sizeof(ps_parm)) {
+				memcpy(&ps_parm, skb->data + HCI_COMMAND_HDR_SIZE, hdr->plen);
+				if (ps_parm.ps_cmd == BT_PS_ENABLE)
+					psdata->target_ps_mode = PS_MODE_ENABLE;
+				else if (ps_parm.ps_cmd == BT_PS_DISABLE)
+					psdata->target_ps_mode = PS_MODE_DISABLE;
+				psdata->c2h_ps_interval = __le16_to_cpu(ps_parm.c2h_ps_interval);
+				hci_cmd_sync_queue(hdev, send_ps_cmd, NULL, NULL);
+				goto free_skb;
+			}
+			break;
+		case HCI_NXP_WAKEUP_METHOD:
+			if (hdr->plen == sizeof(wakeup_parm)) {
+				memcpy(&wakeup_parm, skb->data + HCI_COMMAND_HDR_SIZE, hdr->plen);
+				psdata->c2h_wakeupmode = wakeup_parm.c2h_wakeupmode;
+				psdata->c2h_wakeup_gpio = wakeup_parm.c2h_wakeup_gpio;
+				psdata->h2c_wakeup_gpio = wakeup_parm.h2c_wakeup_gpio;
+				switch (wakeup_parm.h2c_wakeupmode) {
+				case BT_CTRL_WAKEUP_METHOD_DSR:
+					psdata->h2c_wakeupmode = WAKEUP_METHOD_DTR;
+					break;
+				case BT_CTRL_WAKEUP_METHOD_BREAK:
+				default:
+					psdata->h2c_wakeupmode = WAKEUP_METHOD_BREAK;
+					break;
+				}
+				hci_cmd_sync_queue(hdev, send_wakeup_method_cmd, NULL, NULL);
+				goto free_skb;
+			}
+			break;
+		case HCI_NXP_SET_OPER_SPEED:
+			if (hdr->plen == sizeof(baudrate_parm)) {
+				memcpy(&baudrate_parm, skb->data + HCI_COMMAND_HDR_SIZE, hdr->plen);
+				nxpdev->new_baudrate = __le32_to_cpu(baudrate_parm);
+				hci_cmd_sync_queue(hdev, nxp_set_baudrate_cmd, NULL, NULL);
+				goto free_skb;
+			}
+			break;
+		case HCI_NXP_IND_RESET:
+			if (hdr->plen == 1) {
+				hci_cmd_sync_queue(hdev, nxp_set_ind_reset, NULL, NULL);
+				goto free_skb;
+			}
+			break;
+		default:
+			break;
+		}
+	}
+
+	return btnxpuart_queue_skb(hdev, skb);
+
+free_skb:
+	kfree_skb(skb);
+	return 0;
+}
+
+static struct sk_buff *nxp_dequeue(void *data)
+{
+	struct btnxpuart_dev *nxpdev = (struct btnxpuart_dev *)data;
+
+	ps_wakeup(nxpdev);
+	ps_start_timer(nxpdev);
+	return skb_dequeue(&nxpdev->txq);
+}
+
+/* btnxpuart based on serdev */
+static void btnxpuart_tx_work(struct work_struct *work)
+{
+	struct btnxpuart_dev *nxpdev = container_of(work, struct btnxpuart_dev,
+						   tx_work);
+	struct serdev_device *serdev = nxpdev->serdev;
+	struct hci_dev *hdev = nxpdev->hdev;
+	struct sk_buff *skb;
+	int len;
+
+	while ((skb = nxp_dequeue(nxpdev))) {
+		len = serdev_device_write_buf(serdev, skb->data, skb->len);
+		hdev->stat.byte_tx += len;
+
+		skb_pull(skb, len);
+		if (skb->len > 0) {
+			skb_queue_head(&nxpdev->txq, skb);
+			break;
+		}
+
+		switch (hci_skb_pkt_type(skb)) {
+		case HCI_COMMAND_PKT:
+			hdev->stat.cmd_tx++;
+			break;
+		case HCI_ACLDATA_PKT:
+			hdev->stat.acl_tx++;
+			break;
+		case HCI_SCODATA_PKT:
+			hdev->stat.sco_tx++;
+			break;
+		}
+
+		kfree_skb(skb);
+	}
+	clear_bit(BTNXPUART_TX_STATE_ACTIVE, &nxpdev->tx_state);
+}
+
+static int btnxpuart_open(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+	int err = 0;
+
+	err = serdev_device_open(nxpdev->serdev);
+	if (err) {
+		bt_dev_err(hdev, "Unable to open UART device %s",
+			   dev_name(&nxpdev->serdev->dev));
+	} else {
+		set_bit(BTNXPUART_SERDEV_OPEN, &nxpdev->tx_state);
+	}
+	return err;
+}
+
+static int btnxpuart_close(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+
+	ps_wakeup(nxpdev);
+	serdev_device_close(nxpdev->serdev);
+	clear_bit(BTNXPUART_SERDEV_OPEN, &nxpdev->tx_state);
+	return 0;
+}
+
+static int btnxpuart_flush(struct hci_dev *hdev)
+{
+	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
+
+	/* Flush any pending characters */
+	serdev_device_write_flush(nxpdev->serdev);
+	skb_queue_purge(&nxpdev->txq);
+
+	cancel_work_sync(&nxpdev->tx_work);
+
+	kfree_skb(nxpdev->rx_skb);
+	nxpdev->rx_skb = NULL;
+
+	return 0;
+}
+
+static const struct h4_recv_pkt nxp_recv_pkts[] = {
+	{ H4_RECV_ACL,          .recv = hci_recv_frame },
+	{ H4_RECV_SCO,          .recv = hci_recv_frame },
+	{ H4_RECV_EVENT,        .recv = hci_recv_frame },
+	{ NXP_RECV_CHIP_VER_V1, .recv = nxp_recv_chip_ver_v1 },
+	{ NXP_RECV_FW_REQ_V1,   .recv = nxp_recv_fw_req_v1 },
+	{ NXP_RECV_CHIP_VER_V3, .recv = nxp_recv_chip_ver_v3 },
+	{ NXP_RECV_FW_REQ_V3,   .recv = nxp_recv_fw_req_v3 },
+};
+
+static int btnxpuart_receive_buf(struct serdev_device *serdev, const u8 *data,
+				 size_t count)
+{
+	struct btnxpuart_dev *nxpdev = serdev_device_get_drvdata(serdev);
+
+	ps_start_timer(nxpdev);
+
+	nxpdev->rx_skb = h4_recv_buf(nxpdev->hdev, nxpdev->rx_skb, data, count,
+				     nxp_recv_pkts, ARRAY_SIZE(nxp_recv_pkts));
+	if (IS_ERR(nxpdev->rx_skb)) {
+		int err = PTR_ERR(nxpdev->rx_skb);
+		/* Safe to ignore out-of-sync bootloader signatures */
+		if (!is_fw_downloading(nxpdev))
+			bt_dev_err(nxpdev->hdev, "Frame reassembly failed (%d)", err);
+		nxpdev->rx_skb = NULL;
+		return count;
+	}
+	if (!is_fw_downloading(nxpdev))
+		nxpdev->hdev->stat.byte_rx += count;
+	return count;
+}
+
+static void btnxpuart_write_wakeup(struct serdev_device *serdev)
+{
+	serdev_device_write_wakeup(serdev);
+}
+
+static const struct serdev_device_ops btnxpuart_client_ops = {
+	.receive_buf = btnxpuart_receive_buf,
+	.write_wakeup = btnxpuart_write_wakeup,
+};
+
+static int nxp_serdev_probe(struct serdev_device *serdev)
+{
+	struct hci_dev *hdev;
+	struct btnxpuart_dev *nxpdev;
+
+	nxpdev = devm_kzalloc(&serdev->dev, sizeof(*nxpdev), GFP_KERNEL);
+	if (!nxpdev)
+		return -ENOMEM;
+
+	nxpdev->nxp_data = (struct btnxpuart_data *)device_get_match_data(&serdev->dev);
+
+	nxpdev->serdev = serdev;
+	serdev_device_set_drvdata(serdev, nxpdev);
+
+	serdev_device_set_client_ops(serdev, &btnxpuart_client_ops);
+
+	INIT_WORK(&nxpdev->tx_work, btnxpuart_tx_work);
+	skb_queue_head_init(&nxpdev->txq);
+
+	init_waitqueue_head(&nxpdev->fw_dnld_done_wait_q);
+	init_waitqueue_head(&nxpdev->check_boot_sign_wait_q);
+
+	device_property_read_u32(&nxpdev->serdev->dev, "fw-init-baudrate",
+				 &nxpdev->fw_init_baudrate);
+	if (!nxpdev->fw_init_baudrate)
+		nxpdev->fw_init_baudrate = FW_INIT_BAUDRATE;
+
+	set_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
+
+	crc8_populate_msb(crc8_table, POLYNOMIAL8);
+
+	/* Initialize and register HCI device */
+	hdev = hci_alloc_dev();
+	if (!hdev) {
+		dev_err(&serdev->dev, "Can't allocate HCI device\n");
+		return -ENOMEM;
+	}
+
+	nxpdev->hdev = hdev;
+
+	hdev->bus = HCI_UART;
+	hci_set_drvdata(hdev, nxpdev);
+
+	hdev->manufacturer = MANUFACTURER_NXP;
+	hdev->open  = btnxpuart_open;
+	hdev->close = btnxpuart_close;
+	hdev->flush = btnxpuart_flush;
+	hdev->setup = nxp_setup;
+	hdev->send  = nxp_enqueue;
+	hdev->hw_error = nxp_hw_err;
+	hdev->shutdown = nxp_shutdown;
+	SET_HCIDEV_DEV(hdev, &serdev->dev);
+
+	if (hci_register_dev(hdev) < 0) {
+		dev_err(&serdev->dev, "Can't register HCI device\n");
+		hci_free_dev(hdev);
+		return -ENODEV;
+	}
+
+	ps_setup(hdev);
+
+	return 0;
+}
+
+static void nxp_serdev_remove(struct serdev_device *serdev)
+{
+	struct btnxpuart_dev *nxpdev = serdev_device_get_drvdata(serdev);
+	struct hci_dev *hdev = nxpdev->hdev;
+
+	/* Restore FW baudrate to fw_init_baudrate if changed.
+	 * This will ensure FW baudrate is in sync with
+	 * driver baudrate in case this driver is re-inserted.
+	 */
+	if (nxpdev->current_baudrate != nxpdev->fw_init_baudrate) {
+		nxpdev->new_baudrate = nxpdev->fw_init_baudrate;
+		nxp_set_baudrate_cmd(hdev, NULL);
+	}
+
+	ps_cancel_timer(nxpdev);
+	hci_unregister_dev(hdev);
+	hci_free_dev(hdev);
+}
+
+static struct btnxpuart_data w8987_data __maybe_unused = {
+	.helper_fw_name = NULL,
+	.fw_name = FIRMWARE_W8987,
+};
+
+static struct btnxpuart_data w8997_data __maybe_unused = {
+	.helper_fw_name = FIRMWARE_HELPER,
+	.fw_name = FIRMWARE_W8997,
+};
+
+static const struct of_device_id nxpuart_of_match_table[] __maybe_unused = {
+	{ .compatible = "nxp,88w8987-bt", .data = &w8987_data },
+	{ .compatible = "nxp,88w8997-bt", .data = &w8997_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, nxpuart_of_match_table);
+
+static struct serdev_device_driver nxp_serdev_driver = {
+	.probe = nxp_serdev_probe,
+	.remove = nxp_serdev_remove,
+	.driver = {
+		.name = "btnxpuart",
+		.of_match_table = of_match_ptr(nxpuart_of_match_table),
+	},
+};
+
+module_serdev_device_driver(nxp_serdev_driver);
+
+MODULE_AUTHOR("Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>");
+MODULE_DESCRIPTION("NXP Bluetooth Serial driver");
+MODULE_LICENSE("GPL");