1 files changed, 271 insertions, 10 deletions

diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c
index e73b1013ba73..b0b680dd69f4 100644
--- a/drivers/bluetooth/btmtkuart.c
+++ b/drivers/bluetooth/btmtkuart.c
@@ -12,11 +12,15 @@
 #include <linux/atomic.h>
 #include <linux/clk.h>
 #include <linux/firmware.h>
+#include <linux/gpio/consumer.h>
 #include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 #include <linux/serdev.h>
 #include <linux/skbuff.h>
 
@@ -25,18 +29,26 @@
 
 #include "h4_recv.h"
 
-#define VERSION "0.1"
+#define VERSION "0.2"
 
 #define FIRMWARE_MT7622		"mediatek/mt7622pr2h.bin"
+#define FIRMWARE_MT7663		"mediatek/mt7663pr2h.bin"
+#define FIRMWARE_MT7668		"mediatek/mt7668pr2h.bin"
 
 #define MTK_STP_TLR_SIZE	2
 
 #define BTMTKUART_TX_STATE_ACTIVE	1
 #define BTMTKUART_TX_STATE_WAKEUP	2
 #define BTMTKUART_TX_WAIT_VND_EVT	3
+#define BTMTKUART_REQUIRED_WAKEUP	4
+
+#define BTMTKUART_FLAG_STANDALONE_HW	 BIT(0)
 
 enum {
 	MTK_WMT_PATCH_DWNLD = 0x1,
+	MTK_WMT_TEST = 0x2,
+	MTK_WMT_WAKEUP = 0x3,
+	MTK_WMT_HIF = 0x4,
 	MTK_WMT_FUNC_CTRL = 0x6,
 	MTK_WMT_RST = 0x7,
 	MTK_WMT_SEMAPHORE = 0x17,
@@ -57,6 +69,11 @@ struct mtk_stp_hdr {
 	u8	cs;
 } __packed;
 
+struct btmtkuart_data {
+	unsigned int flags;
+	const char *fwname;
+};
+
 struct mtk_wmt_hdr {
 	u8	dir;
 	u8	op;
@@ -100,6 +117,14 @@ struct btmtkuart_dev {
 	struct serdev_device *serdev;
 	struct clk *clk;
 
+	struct regulator *vcc;
+	struct gpio_desc *reset;
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pins_runtime;
+	struct pinctrl_state *pins_boot;
+	speed_t	desired_speed;
+	speed_t	curr_speed;
+
 	struct work_struct tx_work;
 	unsigned long tx_state;
 	struct sk_buff_head txq;
@@ -110,8 +135,15 @@ struct btmtkuart_dev {
 	u8	stp_pad[6];
 	u8	stp_cursor;
 	u16	stp_dlen;
+
+	const struct btmtkuart_data *data;
 };
 
+#define btmtkuart_is_standalone(bdev)	\
+	((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
+#define btmtkuart_is_builtin_soc(bdev)	\
+	!((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
+
 static int mtk_hci_wmt_sync(struct hci_dev *hdev,
 			    struct btmtk_hci_wmt_params *wmt_params)
 {
@@ -202,7 +234,7 @@ err_free_skb:
 	return err;
 }
 
-static int mtk_setup_fw(struct hci_dev *hdev)
+static int mtk_setup_firmware(struct hci_dev *hdev, const char *fwname)
 {
 	struct btmtk_hci_wmt_params wmt_params;
 	const struct firmware *fw;
@@ -211,7 +243,7 @@ static int mtk_setup_fw(struct hci_dev *hdev)
 	int err, dlen;
 	u8 flag;
 
-	err = request_firmware(&fw, FIRMWARE_MT7622, &hdev->dev);
+	err = request_firmware(&fw, fwname, &hdev->dev);
 	if (err < 0) {
 		bt_dev_err(hdev, "Failed to load firmware file (%d)", err);
 		return err;
@@ -523,6 +555,23 @@ static int btmtkuart_open(struct hci_dev *hdev)
 		goto err_open;
 	}
 
+	if (btmtkuart_is_standalone(bdev)) {
+		if (bdev->curr_speed != bdev->desired_speed)
+			err = serdev_device_set_baudrate(bdev->serdev,
+							 115200);
+		else
+			err = serdev_device_set_baudrate(bdev->serdev,
+							 bdev->desired_speed);
+
+		if (err < 0) {
+			bt_dev_err(hdev, "Unable to set baudrate UART device %s",
+				   dev_name(&bdev->serdev->dev));
+			goto  err_serdev_close;
+		}
+
+		serdev_device_set_flow_control(bdev->serdev, false);
+	}
+
 	bdev->stp_cursor = 2;
 	bdev->stp_dlen = 0;
 
@@ -546,6 +595,8 @@ err_put_rpm:
 	pm_runtime_put_sync(dev);
 err_disable_rpm:
 	pm_runtime_disable(dev);
+err_serdev_close:
+	serdev_device_close(bdev->serdev);
 err_open:
 	return err;
 }
@@ -606,8 +657,74 @@ static int btmtkuart_func_query(struct hci_dev *hdev)
 	return status;
 }
 
+static int btmtkuart_change_baudrate(struct hci_dev *hdev)
+{
+	struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
+	struct btmtk_hci_wmt_params wmt_params;
+	u32 baudrate;
+	u8 param;
+	int err;
+
+	/* Indicate the device to enter the probe state the host is
+	 * ready to change a new baudrate.
+	 */
+	baudrate = cpu_to_le32(bdev->desired_speed);
+	wmt_params.op = MTK_WMT_HIF;
+	wmt_params.flag = 1;
+	wmt_params.dlen = 4;
+	wmt_params.data = &baudrate;
+	wmt_params.status = NULL;
+
+	err = mtk_hci_wmt_sync(hdev, &wmt_params);
+	if (err < 0) {
+		bt_dev_err(hdev, "Failed to device baudrate (%d)", err);
+		return err;
+	}
+
+	err = serdev_device_set_baudrate(bdev->serdev,
+					 bdev->desired_speed);
+	if (err < 0) {
+		bt_dev_err(hdev, "Failed to set up host baudrate (%d)",
+			   err);
+		return err;
+	}
+
+	serdev_device_set_flow_control(bdev->serdev, false);
+
+	/* Send a dummy byte 0xff to activate the new baudrate */
+	param = 0xff;
+	err = serdev_device_write(bdev->serdev, &param, sizeof(param),
+				  MAX_SCHEDULE_TIMEOUT);
+	if (err < 0 || err < sizeof(param))
+		return err;
+
+	serdev_device_wait_until_sent(bdev->serdev, 0);
+
+	/* Wait some time for the device changing baudrate done */
+	usleep_range(20000, 22000);
+
+	/* Test the new baudrate */
+	wmt_params.op = MTK_WMT_TEST;
+	wmt_params.flag = 7;
+	wmt_params.dlen = 0;
+	wmt_params.data = NULL;
+	wmt_params.status = NULL;
+
+	err = mtk_hci_wmt_sync(hdev, &wmt_params);
+	if (err < 0) {
+		bt_dev_err(hdev, "Failed to test new baudrate (%d)",
+			   err);
+		return err;
+	}
+
+	bdev->curr_speed = bdev->desired_speed;
+
+	return 0;
+}
+
 static int btmtkuart_setup(struct hci_dev *hdev)
 {
+	struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
 	struct btmtk_hci_wmt_params wmt_params;
 	ktime_t calltime, delta, rettime;
 	struct btmtk_tci_sleep tci_sleep;
@@ -618,6 +735,28 @@ static int btmtkuart_setup(struct hci_dev *hdev)
 
 	calltime = ktime_get();
 
+	/* Wakeup MCUSYS is required for certain devices before we start to
+	 * do any setups.
+	 */
+	if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) {
+		wmt_params.op = MTK_WMT_WAKEUP;
+		wmt_params.flag = 3;
+		wmt_params.dlen = 0;
+		wmt_params.data = NULL;
+		wmt_params.status = NULL;
+
+		err = mtk_hci_wmt_sync(hdev, &wmt_params);
+		if (err < 0) {
+			bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err);
+			return err;
+		}
+
+		clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
+	}
+
+	if (btmtkuart_is_standalone(bdev))
+		btmtkuart_change_baudrate(hdev);
+
 	/* Query whether the firmware is already download */
 	wmt_params.op = MTK_WMT_SEMAPHORE;
 	wmt_params.flag = 1;
@@ -637,7 +776,7 @@ static int btmtkuart_setup(struct hci_dev *hdev)
 	}
 
 	/* Setup a firmware which the device definitely requires */
-	err = mtk_setup_fw(hdev);
+	err = mtk_setup_firmware(hdev, bdev->data->fwname);
 	if (err < 0)
 		return err;
 
@@ -754,24 +893,82 @@ static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 	return 0;
 }
 
+static int btmtkuart_parse_dt(struct serdev_device *serdev)
+{
+	struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
+	struct device_node *node = serdev->dev.of_node;
+	u32 speed = 921600;
+	int err;
+
+	if (btmtkuart_is_standalone(bdev)) {
+		of_property_read_u32(node, "current-speed", &speed);
+
+		bdev->desired_speed = speed;
+
+		bdev->vcc = devm_regulator_get(&serdev->dev, "vcc");
+		if (IS_ERR(bdev->vcc)) {
+			err = PTR_ERR(bdev->vcc);
+			return err;
+		}
+
+		bdev->pinctrl = devm_pinctrl_get(&serdev->dev);
+		if (IS_ERR(bdev->pinctrl)) {
+			err = PTR_ERR(bdev->pinctrl);
+			return err;
+		}
+
+		bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl,
+						       "default");
+		if (IS_ERR(bdev->pins_boot)) {
+			err = PTR_ERR(bdev->pins_boot);
+			return err;
+		}
+
+		bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl,
+							  "runtime");
+		if (IS_ERR(bdev->pins_runtime)) {
+			err = PTR_ERR(bdev->pins_runtime);
+			return err;
+		}
+
+		bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset",
+						      GPIOD_OUT_LOW);
+		if (IS_ERR(bdev->reset)) {
+			err = PTR_ERR(bdev->reset);
+			return err;
+		}
+	} else if (btmtkuart_is_builtin_soc(bdev)) {
+		bdev->clk = devm_clk_get(&serdev->dev, "ref");
+		if (IS_ERR(bdev->clk))
+			return PTR_ERR(bdev->clk);
+	}
+
+	return 0;
+}
+
 static int btmtkuart_probe(struct serdev_device *serdev)
 {
 	struct btmtkuart_dev *bdev;
 	struct hci_dev *hdev;
+	int err;
 
 	bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL);
 	if (!bdev)
 		return -ENOMEM;
 
-	bdev->clk = devm_clk_get(&serdev->dev, "ref");
-	if (IS_ERR(bdev->clk))
-		return PTR_ERR(bdev->clk);
+	bdev->data = of_device_get_match_data(&serdev->dev);
+	if (!bdev->data)
+		return -ENODEV;
 
 	bdev->serdev = serdev;
 	serdev_device_set_drvdata(serdev, bdev);
 
 	serdev_device_set_client_ops(serdev, &btmtkuart_client_ops);
 
+	err = btmtkuart_parse_dt(serdev);
+	if (err < 0)
+		return err;
+
 	INIT_WORK(&bdev->tx_work, btmtkuart_tx_work);
 	skb_queue_head_init(&bdev->txq);
 
@@ -798,13 +995,54 @@ static int btmtkuart_probe(struct serdev_device *serdev)
 	hdev->manufacturer = 70;
 	set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
 
-	if (hci_register_dev(hdev) < 0) {
+	if (btmtkuart_is_standalone(bdev)) {
+		/* Switch to the specific pin state for the booting requires */
+		pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);
+
+		/* Power on */
+		err = regulator_enable(bdev->vcc);
+		if (err < 0)
+			return err;
+
+		/* Reset if the reset-gpios is available otherwise the board
+		 * -level design should be guaranteed.
+		 */
+		if (bdev->reset) {
+			gpiod_set_value_cansleep(bdev->reset, 1);
+			usleep_range(1000, 2000);
+			gpiod_set_value_cansleep(bdev->reset, 0);
+		}
+
+		/* Wait some time until device got ready and switch to the pin
+		 * mode the device requires for UART transfers.
+		 */
+		msleep(50);
+		pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime);
+
+		/* A standalone device doesn't depends on power domain on SoC,
+		 * so mark it as no callbacks.
+		 */
+		pm_runtime_no_callbacks(&serdev->dev);
+
+		set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
+	}
+
+	err = hci_register_dev(hdev);
+	if (err < 0) {
 		dev_err(&serdev->dev, "Can't register HCI device\n");
 		hci_free_dev(hdev);
-		return -ENODEV;
+		goto err_regulator_disable;
 	}
 
 	return 0;
+
+err_regulator_disable:
+	if (btmtkuart_is_standalone(bdev))  {
+		pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);
+		regulator_disable(bdev->vcc);
+	}
+
+	return err;
 }
 
 static void btmtkuart_remove(struct serdev_device *serdev)
@@ -812,13 +1050,34 @@ static void btmtkuart_remove(struct serdev_device *serdev)
 	struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
 	struct hci_dev *hdev = bdev->hdev;
 
+	if (btmtkuart_is_standalone(bdev))  {
+		pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);
+		regulator_disable(bdev->vcc);
+	}
+
 	hci_unregister_dev(hdev);
 	hci_free_dev(hdev);
 }
 
+static const struct btmtkuart_data mt7622_data = {
+	.fwname = FIRMWARE_MT7622,
+};
+
+static const struct btmtkuart_data mt7663_data = {
+	.flags = BTMTKUART_FLAG_STANDALONE_HW,
+	.fwname = FIRMWARE_MT7663,
+};
+
+static const struct btmtkuart_data mt7668_data = {
+	.flags = BTMTKUART_FLAG_STANDALONE_HW,
+	.fwname = FIRMWARE_MT7668,
+};
+
 #ifdef CONFIG_OF
 static const struct of_device_id mtk_of_match_table[] = {
-	{ .compatible = "mediatek,mt7622-bluetooth"},
+	{ .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data},
+	{ .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data},
+	{ .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mtk_of_match_table);
@@ -840,3 +1099,5 @@ MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION);
 MODULE_VERSION(VERSION);
 MODULE_LICENSE("GPL");
 MODULE_FIRMWARE(FIRMWARE_MT7622);
+MODULE_FIRMWARE(FIRMWARE_MT7663);
+MODULE_FIRMWARE(FIRMWARE_MT7668);