[v1,1/2] Bluetooth: hci_qca: Add support for QTI Bluetooth chip wcn6750

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index 25114f0..00ce0e9 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -182,7 +182,8 @@  int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
 }
 EXPORT_SYMBOL_GPL(qca_send_pre_shutdown_cmd);
 
-static void qca_tlv_check_data(struct qca_fw_config *config,
+static void qca_tlv_check_data(struct hci_dev *hdev,
+			       struct qca_fw_config *config,
 		const struct firmware *fw, enum qca_btsoc_type soc_type)
 {
 	const u8 *data;
@@ -194,19 +195,21 @@  static void qca_tlv_check_data(struct qca_fw_config *config,
 	struct tlv_type_nvm *tlv_nvm;
 	uint8_t nvm_baud_rate = config->user_baud_rate;
 
-	tlv = (struct tlv_type_hdr *)fw->data;
-
-	type_len = le32_to_cpu(tlv->type_len);
-	length = (type_len >> 8) & 0x00ffffff;
-
-	BT_DBG("TLV Type\t\t : 0x%x", type_len & 0x000000ff);
-	BT_DBG("Length\t\t : %d bytes", length);
-
 	config->dnld_mode = QCA_SKIP_EVT_NONE;
 	config->dnld_type = QCA_SKIP_EVT_NONE;
 
 	switch (config->type) {
+	case ELF_TYPE_PATCH:
+		config->dnld_mode = QCA_SKIP_EVT_VSE_CC;
+		config->dnld_type = QCA_SKIP_EVT_VSE_CC;
+
+		bt_dev_dbg(hdev, "File Class        : 0x%x", fw->data[4]);
+		bt_dev_dbg(hdev, "Data Encoding     : 0x%x", fw->data[5]);
+		bt_dev_dbg(hdev, "File version      : 0x%x", fw->data[6]);
+		break;
 	case TLV_TYPE_PATCH:
+		tlv = (struct tlv_type_hdr *)fw->data;
+		type_len = le32_to_cpu(tlv->type_len);
 		tlv_patch = (struct tlv_type_patch *)tlv->data;
 
 		/* For Rome version 1.1 to 3.1, all segment commands
@@ -218,6 +221,7 @@  static void qca_tlv_check_data(struct qca_fw_config *config,
 		config->dnld_mode = tlv_patch->download_mode;
 		config->dnld_type = config->dnld_mode;
 
+		BT_DBG("TLV Type\t\t : 0x%x", type_len & 0x000000ff);
 		BT_DBG("Total Length           : %d bytes",
 		       le32_to_cpu(tlv_patch->total_size));
 		BT_DBG("Patch Data Length      : %d bytes",
@@ -243,6 +247,14 @@  static void qca_tlv_check_data(struct qca_fw_config *config,
 		break;
 
 	case TLV_TYPE_NVM:
+		tlv = (struct tlv_type_hdr *)fw->data;
+
+		type_len = le32_to_cpu(tlv->type_len);
+		length = (type_len >> 8) & 0x00ffffff;
+
+		BT_DBG("TLV Type\t\t : 0x%x", type_len & 0x000000ff);
+		BT_DBG("Length\t\t : %d bytes", length);
+
 		idx = 0;
 		data = tlv->data;
 		while (idx < length) {
@@ -387,7 +399,8 @@  static int qca_inject_cmd_complete_event(struct hci_dev *hdev)
 
 static int qca_download_firmware(struct hci_dev *hdev,
 				 struct qca_fw_config *config,
-				 enum qca_btsoc_type soc_type)
+				 enum qca_btsoc_type soc_type,
+				 u8 rom_ver)
 {
 	const struct firmware *fw;
 	const u8 *segment;
@@ -397,12 +410,29 @@  static int qca_download_firmware(struct hci_dev *hdev,
 
 	ret = request_firmware(&fw, config->fwname, &hdev->dev);
 	if (ret) {
-		bt_dev_err(hdev, "QCA Failed to request file: %s (%d)",
-			   config->fwname, ret);
-		return ret;
+		/* For WCN6750, if mbn file is not present then check for
+		 * tlv file.
+		 */
+		if (soc_type == QCA_WCN6750 && config->type == ELF_TYPE_PATCH) {
+			bt_dev_dbg(hdev, "QCA Failed to request file: %s (%d)",
+				   config->fwname, ret);
+			config->type = TLV_TYPE_PATCH;
+			snprintf(config->fwname, sizeof(config->fwname),
+				 "qca/msbtfw%02x.tlv", rom_ver);
+			ret = request_firmware(&fw, config->fwname, &hdev->dev);
+			if (ret) {
+				bt_dev_err(hdev, "QCA Failed to request file: %s (%d)",
+					   config->fwname, ret);
+				return ret;
+			}
+		} else {
+			bt_dev_err(hdev, "QCA Failed to request file: %s (%d)",
+				   config->fwname, ret);
+			return ret;
+		}
 	}
 
-	qca_tlv_check_data(config, fw, soc_type);
+	qca_tlv_check_data(hdev, config, fw, soc_type);
 
 	segment = fw->data;
 	remain = fw->size;
@@ -502,27 +532,33 @@  int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
 
 	config.user_baud_rate = baudrate;
 
+	/* Firmware files to download are based on ROM version.
+	 * ROM version is derived from last two bytes of soc_ver.
+	 */
+	rom_ver = ((soc_ver & 0x00000f00) >> 0x04) |
+		    (soc_ver & 0x0000000f);
+
 	/* Download rampatch file */
 	config.type = TLV_TYPE_PATCH;
 	if (qca_is_wcn399x(soc_type)) {
-		/* Firmware files to download are based on ROM version.
-		 * ROM version is derived from last two bytes of soc_ver.
-		 */
-		rom_ver = ((soc_ver & 0x00000f00) >> 0x04) |
-			    (soc_ver & 0x0000000f);
 		snprintf(config.fwname, sizeof(config.fwname),
 			 "qca/crbtfw%02x.tlv", rom_ver);
 	} else if (soc_type == QCA_QCA6390) {
-		rom_ver = ((soc_ver & 0x00000f00) >> 0x04) |
-			    (soc_ver & 0x0000000f);
 		snprintf(config.fwname, sizeof(config.fwname),
 			 "qca/htbtfw%02x.tlv", rom_ver);
+	} else if (soc_type == QCA_WCN6750) {
+		/* Choose mbn file by default.If mbn file is not found
+		 * then choose tlv file
+		 */
+		config.type = ELF_TYPE_PATCH;
+		snprintf(config.fwname, sizeof(config.fwname),
+			 "qca/msbtfw%02x.mbn", rom_ver);
 	} else {
 		snprintf(config.fwname, sizeof(config.fwname),
 			 "qca/rampatch_%08x.bin", soc_ver);
 	}
 
-	err = qca_download_firmware(hdev, &config, soc_type);
+	err = qca_download_firmware(hdev, &config, soc_type, rom_ver);
 	if (err < 0) {
 		bt_dev_err(hdev, "QCA Failed to download patch (%d)", err);
 		return err;
@@ -548,11 +584,14 @@  int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
 	else if (soc_type == QCA_QCA6390)
 		snprintf(config.fwname, sizeof(config.fwname),
 			 "qca/htnv%02x.bin", rom_ver);
+	else if (soc_type == QCA_WCN6750)
+		snprintf(config.fwname, sizeof(config.fwname),
+			 "qca/msnv%02x.bin", rom_ver);
 	else
 		snprintf(config.fwname, sizeof(config.fwname),
 			 "qca/nvm_%08x.bin", soc_ver);
 
-	err = qca_download_firmware(hdev, &config, soc_type);
+	err = qca_download_firmware(hdev, &config, soc_type, rom_ver);
 	if (err < 0) {
 		bt_dev_err(hdev, "QCA Failed to download NVM (%d)", err);
 		return err;
diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
index b19add7..3057bf8 100644
--- a/drivers/bluetooth/btqca.h
+++ b/drivers/bluetooth/btqca.h
@@ -80,7 +80,8 @@  enum qca_tlv_dnld_mode {
 
 enum qca_tlv_type {
 	TLV_TYPE_PATCH = 1,
-	TLV_TYPE_NVM
+	TLV_TYPE_NVM,
+	ELF_TYPE_PATCH
 };
 
 struct qca_fw_config {
@@ -143,6 +144,7 @@  enum qca_btsoc_type {
 	QCA_WCN3998,
 	QCA_WCN3991,
 	QCA_QCA6390,
+	QCA_WCN6750
 };
 
 #if IS_ENABLED(CONFIG_BT_QCA)
@@ -160,6 +162,12 @@  static inline bool qca_is_wcn399x(enum qca_btsoc_type soc_type)
 	return soc_type == QCA_WCN3990 || soc_type == QCA_WCN3991 ||
 	       soc_type == QCA_WCN3998;
 }
+static inline bool qca_is_wcn399x_wcn6750(enum qca_btsoc_type soc_type)
+{
+	return soc_type == QCA_WCN3990 || soc_type == QCA_WCN3991 ||
+	       soc_type == QCA_WCN3998 || soc_type == QCA_WCN6750;
+}
+
 #else
 
 static inline int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr)
@@ -192,6 +200,11 @@  static inline bool qca_is_wcn399x(enum qca_btsoc_type soc_type)
 	return false;
 }
 
+static inline bool qca_is_wcn399x_wcn6750(enum qca_btsoc_type soc_type)
+{
+	return false;
+}
+
 static inline int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
 {
 	return -EOPNOTSUPP;
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 73af901..8959a6d 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -70,6 +70,10 @@ 
 #define QCA_CRASHBYTE_PACKET_LEN	1096
 #define QCA_MEMDUMP_BYTE		0xFB
 
+/* BT_EN GPIO enable/disable */
+#define BT_ON		1
+#define BT_OFF		0
+
 enum qca_flags {
 	QCA_IBS_DISABLED,
 	QCA_DROP_VENDOR_EVENT,
@@ -218,6 +222,7 @@  struct qca_power {
 struct qca_serdev {
 	struct hci_uart	 serdev_hu;
 	struct gpio_desc *bt_en;
+	struct gpio_desc *sw_ctrl;
 	struct clk	 *susclk;
 	enum qca_btsoc_type btsoc_type;
 	struct qca_power *bt_power;
@@ -604,7 +609,7 @@  static int qca_open(struct hci_uart *hu)
 	if (hu->serdev) {
 		qcadev = serdev_device_get_drvdata(hu->serdev);
 
-		if (qca_is_wcn399x(qcadev->btsoc_type))
+		if (qca_is_wcn399x_wcn6750(qcadev->btsoc_type))
 			hu->init_speed = qcadev->init_speed;
 
 		if (qcadev->oper_speed)
@@ -1308,7 +1313,7 @@  static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 		      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
 
 	/* Give the controller time to process the request */
-	if (qca_is_wcn399x(qca_soc_type(hu)))
+	if (qca_is_wcn399x_wcn6750(qca_soc_type(hu)))
 		usleep_range(1000, 10000);
 	else
 		msleep(300);
@@ -1384,7 +1389,7 @@  static unsigned int qca_get_speed(struct hci_uart *hu,
 
 static int qca_check_speeds(struct hci_uart *hu)
 {
-	if (qca_is_wcn399x(qca_soc_type(hu))) {
+	if (qca_is_wcn399x_wcn6750(qca_soc_type(hu))) {
 		if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
 		    !qca_get_speed(hu, QCA_OPER_SPEED))
 			return -EINVAL;
@@ -1417,7 +1422,7 @@  static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
 		/* Disable flow control for wcn3990 to deassert RTS while
 		 * changing the baudrate of chip and host.
 		 */
-		if (qca_is_wcn399x(soc_type))
+		if (qca_is_wcn399x_wcn6750(soc_type))
 			hci_uart_set_flow_control(hu, true);
 
 		if (soc_type == QCA_WCN3990) {
@@ -1434,7 +1439,7 @@  static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
 		host_set_baudrate(hu, speed);
 
 error:
-		if (qca_is_wcn399x(soc_type))
+		if (qca_is_wcn399x_wcn6750(soc_type))
 			hci_uart_set_flow_control(hu, false);
 
 		if (soc_type == QCA_WCN3990) {
@@ -1585,10 +1590,12 @@  static bool qca_prevent_wake(struct hci_dev *hdev)
 	return !wakeup;
 }
 
-static int qca_wcn3990_init(struct hci_uart *hu)
+static int qca_regulator_init(struct hci_uart *hu)
 {
+	enum qca_btsoc_type soc_type = qca_soc_type(hu);
 	struct qca_serdev *qcadev;
 	int ret;
+	bool sw_ctrl_state;
 
 	/* Check for vregs status, may be hci down has turned
 	 * off the voltage regulator.
@@ -1607,16 +1614,31 @@  static int qca_wcn3990_init(struct hci_uart *hu)
 		}
 	}
 
-	/* Forcefully enable wcn3990 to enter in to boot mode. */
-	host_set_baudrate(hu, 2400);
-	ret = qca_send_power_pulse(hu, false);
-	if (ret)
-		return ret;
+	if (qca_is_wcn399x(soc_type)) {
+		/* Forcefully enable wcn3990 to enter in to boot mode. */
+		host_set_baudrate(hu, 2400);
+		ret = qca_send_power_pulse(hu, false);
+		if (ret)
+			return ret;
+	}
+
+	/* For wcn6750 need to enable gpio bt_en */
+	if (qcadev->bt_en) {
+		gpiod_set_value_cansleep(qcadev->bt_en, BT_OFF);
+		msleep(50);
+		gpiod_set_value_cansleep(qcadev->bt_en, BT_ON);
+		msleep(50);
+		sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
+		bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
+	}
 
 	qca_set_speed(hu, QCA_INIT_SPEED);
-	ret = qca_send_power_pulse(hu, true);
-	if (ret)
-		return ret;
+
+	if (qca_is_wcn399x(soc_type)) {
+		ret = qca_send_power_pulse(hu, true);
+		if (ret)
+			return ret;
+	}
 
 	/* Now the device is in ready state to communicate with host.
 	 * To sync host with device we need to reopen port.
@@ -1649,12 +1671,12 @@  static int qca_power_on(struct hci_dev *hdev)
 	if (!hu->serdev)
 		return 0;
 
-	if (qca_is_wcn399x(soc_type)) {
-		ret = qca_wcn3990_init(hu);
+	if (qca_is_wcn399x_wcn6750(soc_type)) {
+		ret = qca_regulator_init(hu);
 	} else {
 		qcadev = serdev_device_get_drvdata(hu->serdev);
 		if (qcadev->bt_en) {
-			gpiod_set_value_cansleep(qcadev->bt_en, 1);
+			gpiod_set_value_cansleep(qcadev->bt_en, BT_ON);
 			/* Controller needs time to bootup. */
 			msleep(150);
 		}
@@ -1689,7 +1711,8 @@  static int qca_setup(struct hci_uart *hu)
 	set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
 
 	bt_dev_info(hdev, "setting up %s",
-		qca_is_wcn399x(soc_type) ? "wcn399x" : "ROME/QCA6390");
+		qca_is_wcn399x(soc_type) ? "wcn399x" :
+		(soc_type == QCA_WCN6750) ? "wcn6750" : "ROME/QCA6390");
 
 	qca->memdump_state = QCA_MEMDUMP_IDLE;
 
@@ -1700,7 +1723,7 @@  static int qca_setup(struct hci_uart *hu)
 
 	clear_bit(QCA_SSR_TRIGGERED, &qca->flags);
 
-	if (qca_is_wcn399x(soc_type)) {
+	if (qca_is_wcn399x_wcn6750(soc_type)) {
 		set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
 
 		ret = qca_read_soc_version(hdev, &ver, soc_type);
@@ -1720,7 +1743,7 @@  static int qca_setup(struct hci_uart *hu)
 		qca_baudrate = qca_get_baudrate_value(speed);
 	}
 
-	if (!qca_is_wcn399x(soc_type)) {
+	if (!qca_is_wcn399x_wcn6750(soc_type)) {
 		/* Get QCA version information */
 		ret = qca_read_soc_version(hdev, &ver, soc_type);
 		if (ret)
@@ -1828,12 +1851,30 @@  static const struct qca_device_data qca_soc_data_qca6390 = {
 	.num_vregs = 0,
 };
 
+static const struct qca_device_data qca_soc_data_wcn6750 = {
+	.soc_type = QCA_WCN6750,
+	.vregs = (struct qca_vreg []) {
+		{ "vddio", 5000 },
+		{ "vddaon", 26000 },
+		{ "vddbtcxmx", 126000 },
+		{ "vddrfacmn", 12500 },
+		{ "vddrfa0p8", 102000 },
+		{ "vddrfa1p7", 302000 },
+		{ "vddrfa1p2", 257000 },
+		{ "vddrfa2p2", 1700000 },
+		{ "vddasd", 200 },
+	},
+	.num_vregs = 9,
+	.capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
+};
+
 static void qca_power_shutdown(struct hci_uart *hu)
 {
 	struct qca_serdev *qcadev;
 	struct qca_data *qca = hu->priv;
 	unsigned long flags;
 	enum qca_btsoc_type soc_type = qca_soc_type(hu);
+	bool sw_ctrl_state;
 
 	qcadev = serdev_device_get_drvdata(hu->serdev);
 
@@ -1856,8 +1897,14 @@  static void qca_power_shutdown(struct hci_uart *hu)
 		host_set_baudrate(hu, 2400);
 		qca_send_power_pulse(hu, false);
 		qca_regulator_disable(qcadev);
+	} else if (soc_type == QCA_WCN6750) {
+		gpiod_set_value_cansleep(qcadev->bt_en, BT_OFF);
+		msleep(100);
+		qca_regulator_disable(qcadev);
+		sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
+		bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
 	} else if (qcadev->bt_en) {
-		gpiod_set_value_cansleep(qcadev->bt_en, 0);
+		gpiod_set_value_cansleep(qcadev->bt_en, BT_OFF);
 	}
 
 	set_bit(QCA_BT_OFF, &qca->flags);
@@ -1978,7 +2025,7 @@  static int qca_serdev_probe(struct serdev_device *serdev)
 	if (!qcadev->oper_speed)
 		BT_DBG("UART will pick default operating speed");
 
-	if (data && qca_is_wcn399x(data->soc_type)) {
+	if (data && qca_is_wcn399x_wcn6750(data->soc_type)) {
 		qcadev->btsoc_type = data->soc_type;
 		qcadev->bt_power = devm_kzalloc(&serdev->dev,
 						sizeof(struct qca_power),
@@ -1996,6 +2043,18 @@  static int qca_serdev_probe(struct serdev_device *serdev)
 
 		qcadev->bt_power->vregs_on = false;
 
+		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
+					       GPIOD_OUT_LOW);
+		if (!qcadev->bt_en && data->soc_type == QCA_WCN6750) {
+			dev_err(&serdev->dev, "failed to acquire BT_EN gpio\n");
+			power_ctrl_enabled = false;
+		}
+
+		qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
+					       GPIOD_IN);
+		if (!qcadev->sw_ctrl && data->soc_type == QCA_WCN6750)
+			dev_warn(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
+
 		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
 		if (IS_ERR(qcadev->susclk)) {
 			dev_err(&serdev->dev, "failed to acquire clk\n");
@@ -2068,7 +2127,7 @@  static void qca_serdev_remove(struct serdev_device *serdev)
 	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
 	struct qca_power *power = qcadev->bt_power;
 
-	if (qca_is_wcn399x(qcadev->btsoc_type) && power->vregs_on)
+	if (qca_is_wcn399x_wcn6750(qcadev->btsoc_type) && power->vregs_on)
 		qca_power_shutdown(&qcadev->serdev_hu);
 	else if (qcadev->susclk)
 		clk_disable_unprepare(qcadev->susclk);
@@ -2244,6 +2303,7 @@  static const struct of_device_id qca_bluetooth_of_match[] = {
 	{ .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
 	{ .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
 	{ .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
+	{ .compatible = "qcom,wcn6750-bt", .data = &qca_soc_data_wcn6750},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);