[PATCH v8 7/7] Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990

From: Balakrishna Godavarthi
Date: Mon Jun 25 2018 - 09:40:57 EST

Add support to set voltage/current of various regulators
to power up/down Bluetooth chip wcn3990.

Signed-off-by: Balakrishna Godavarthi <bgodavar@xxxxxxxxxxxxxx>
---
changes in v8:
* closing qca buffer, if qca_power_setup fails
* chnaged ibs start timer function call location.
* updated review comments.

changes in v7:
* addressed review comments.

changes in v6:
* Hooked up qca_power to qca_serdev.
* renamed all the naming inconsistency functions with qca_*
* leveraged common code of ROME for wcn3990.
* created wrapper functions for re-usable blocks.
* updated function of _*regulator_enable and _*regualtor_disable.
* removed redundant comments and functions.
* addressed review comments.

Changes in v5:
* updated regulator vddpa min_uV to 1304000.
* addressed review comments.

Changes in v4:
* Segregated the changes of btqca from hci_qca
* rebased all changes on top of bluetooth-next.
* addressed review comments.

---
drivers/bluetooth/btqca.h | 3 +
drivers/bluetooth/hci_qca.c | 346 ++++++++++++++++++++++++++++++++----
2 files changed, 312 insertions(+), 37 deletions(-)

diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
index 24d6667eecf1..ba6bdbef9869 100644
--- a/drivers/bluetooth/btqca.h
+++ b/drivers/bluetooth/btqca.h
@@ -37,6 +37,9 @@
#define EDL_TAG_ID_HCI (17)
#define EDL_TAG_ID_DEEP_SLEEP (27)

+#define QCA_WCN3990_POWERON_PULSE 0xFC
+#define QCA_WCN3990_POWEROFF_PULSE 0xC0
+
enum qca_bardrate {
QCA_BAUDRATE_115200 = 0,
QCA_BAUDRATE_57600,
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 28187a89b850..bd4c9a78716f 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -5,7 +5,7 @@
* protocol extension to H4.
*
* Copyright (C) 2007 Texas Instruments, Inc.
- * Copyright (c) 2010, 2012 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights reserved.
*
* Acknowledgements:
* This file is based on hci_ll.c, which was...
@@ -31,9 +31,14 @@
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
#include <linux/serdev.h>

#include <net/bluetooth/bluetooth.h>
@@ -124,12 +129,46 @@ enum qca_speed_type {
QCA_OPER_SPEED
};

+/*
+ * Voltage regulator information required for configuring the
+ * QCA Bluetooth chipset
+ */
+struct qca_vreg {
+ const char *name;
+ unsigned int min_uV;
+ unsigned int max_uV;
+ unsigned int load_uA;
+};
+
+struct qca_vreg_data {
+ enum qca_btsoc_type soc_type;
+ struct qca_vreg *vregs;
+ size_t num_vregs;
+};
+
+/*
+ * Platform data for the QCA Bluetooth power driver.
+ */
+struct qca_power {
+ struct device *dev;
+ const struct qca_vreg_data *vreg_data;
+ struct regulator_bulk_data *vreg_bulk;
+ bool vregs_on;
+};
+
struct qca_serdev {
struct hci_uart serdev_hu;
struct gpio_desc *bt_en;
struct clk *susclk;
+ enum qca_btsoc_type btsoc_type;
+ struct qca_power *bt_power;
+ u32 init_speed;
+ u32 oper_speed;
};

+static int qca_power_setup(struct hci_uart *hu, bool on);
+static void qca_power_shutdown(struct hci_uart *hu);
+
static void __serial_clock_on(struct tty_struct *tty)
{
/* TODO: Some chipset requires to enable UART clock on client
@@ -407,6 +446,7 @@ static int qca_open(struct hci_uart *hu)
{
struct qca_serdev *qcadev;
struct qca_data *qca;
+ int ret;

BT_DBG("hu %p qca_open", hu);

@@ -458,19 +498,32 @@ static int qca_open(struct hci_uart *hu)

hu->priv = qca;

- timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
- qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
-
- timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
- qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
-
if (hu->serdev) {
serdev_device_open(hu->serdev);

qcadev = serdev_device_get_drvdata(hu->serdev);
- gpiod_set_value_cansleep(qcadev->bt_en, 1);
+ if (qcadev->btsoc_type != QCA_WCN3990) {
+ gpiod_set_value_cansleep(qcadev->bt_en, 1);
+ } else {
+ hu->init_speed = qcadev->init_speed;
+ hu->oper_speed = qcadev->oper_speed;
+ ret = qca_power_setup(hu, true);
+ if (ret) {
+ destroy_workqueue(qca->workqueue);
+ kfree_skb(qca->rx_skb);
+ hu->priv = NULL;
+ kfree(qca);
+ return ret;
+ }
+ }
}

+ timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
+ qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
+
+ timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
+ qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
+
BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
qca->tx_idle_delay, qca->wake_retrans);

@@ -554,10 +607,13 @@ static int qca_close(struct hci_uart *hu)
qca->hu = NULL;

if (hu->serdev) {
- serdev_device_close(hu->serdev);
-
qcadev = serdev_device_get_drvdata(hu->serdev);
- gpiod_set_value_cansleep(qcadev->bt_en, 0);
+ if (qcadev->btsoc_type == QCA_WCN3990)
+ qca_power_shutdown(hu);
+ else
+ gpiod_set_value_cansleep(qcadev->bt_en, 0);
+
+ serdev_device_close(hu->serdev);
}

kfree_skb(qca->rx_skb);
@@ -930,6 +986,32 @@ static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
hci_uart_set_baudrate(hu, speed);
}

+static int qca_send_vendor_cmd(struct hci_dev *hdev, u8 cmd)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+ struct qca_data *qca = hu->priv;
+ struct sk_buff *skb;
+
+ bt_dev_dbg(hdev, "sending command %02x to SoC", cmd);
+
+ skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
+ if (!skb) {
+ bt_dev_err(hdev, "Failed to allocate memory for vendor packet");
+ return -ENOMEM;
+ }
+
+ skb_put_u8(skb, cmd);
+ hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
+
+ skb_queue_tail(&qca->txq, skb);
+ hci_uart_tx_wakeup(hu);
+
+ /* Wait for 100 uS for SoC to settle down */
+ usleep_range(100, 200);
+
+ return 0;
+}
+
static unsigned int qca_get_speed(struct hci_uart *hu,
enum qca_speed_type speed_type)
{
@@ -952,6 +1034,7 @@ static unsigned int qca_get_speed(struct hci_uart *hu,

static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
{
+ struct qca_serdev *qcadev;
unsigned int speed, qca_baudrate;
int ret;

@@ -971,6 +1054,13 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
return 0;
}

+ qcadev = serdev_device_get_drvdata(hu->serdev);
+ /* Disabling hardware flow control is preferred while
+ * sending change baud rate command to SoC.
+ */
+ if (qcadev->btsoc_type == QCA_WCN3990)
+ hci_uart_set_flow_control(hu, true);
+
qca_baudrate = qca_get_baudrate_value(speed);
bt_dev_info(hu->hdev, "Set UART speed to %d", speed);
ret = qca_set_baudrate(hu->hdev, qca_baudrate);
@@ -980,8 +1070,10 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
}

host_set_baudrate(hu, speed);
+ if (qcadev->btsoc_type == QCA_WCN3990)
+ hci_uart_set_flow_control(hu, false);

- return ret;
+ return 0;
}

static int qca_setup(struct hci_uart *hu)
@@ -989,10 +1081,11 @@ static int qca_setup(struct hci_uart *hu)
struct hci_dev *hdev = hu->hdev;
struct qca_data *qca = hu->priv;
unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
+ struct qca_serdev *qcadev;
int ret;
int soc_ver = 0;

- bt_dev_info(hdev, "ROME setup");
+ qcadev = serdev_device_get_drvdata(hu->serdev);

/* Patch downloading has to be done without IBS mode */
clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
@@ -1000,6 +1093,35 @@ static int qca_setup(struct hci_uart *hu)
/* Setup initial baudrate */
qca_set_speed(hu, QCA_INIT_SPEED);

+ if (qcadev->btsoc_type == QCA_WCN3990) {
+ bt_dev_dbg(hdev, "setting up wcn3990");
+ hci_uart_set_flow_control(hu, true);
+ ret = qca_send_vendor_cmd(hdev, QCA_WCN3990_POWERON_PULSE);
+ if (ret)
+ return ret;
+
+ hci_uart_set_flow_control(hu, false);
+ serdev_device_close(hu->serdev);
+ ret = serdev_device_open(hu->serdev);
+ if (ret) {
+ bt_dev_err(hdev, "failed to open port");
+ return ret;
+ }
+
+ msleep(100);
+ /* Setup initial baudrate */
+ qca_set_speed(hu, QCA_INIT_SPEED);
+ hci_uart_set_flow_control(hu, false);
+ ret = qca_read_soc_version(hdev, &soc_ver);
+ if (ret < 0 || soc_ver == 0) {
+ bt_dev_err(hdev, "Failed to get version %d", ret);
+ return ret;
+ }
+ bt_dev_info(hdev, "wcn3990 controller version 0x%08x", soc_ver);
+ } else {
+ bt_dev_info(hdev, "ROME setup");
+ }
+
/* Setup user speed if needed */
ret = qca_set_speed(hu, QCA_OPER_SPEED);
if (ret)
@@ -1010,7 +1132,7 @@ static int qca_setup(struct hci_uart *hu)
qca_baudrate = qca_get_baudrate_value(speed);

/* Setup patch / NVM configurations */
- ret = qca_uart_setup(hdev, qca_baudrate, QCA_ROME, soc_ver);
+ ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver);
if (!ret) {
set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
qca_debugfs_init(hdev);
@@ -1046,9 +1168,124 @@ static struct hci_uart_proto qca_proto = {
.dequeue = qca_dequeue,
};

+static const struct qca_vreg_data qca_soc_data = {
+ .soc_type = QCA_WCN3990,
+ .vregs = (struct qca_vreg []) {
+ { "vddio", 1352000, 1352000, 0 },
+ { "vddxtal", 1904000, 2040000, 0 },
+ { "vddcore", 1800000, 1800000, 1 },
+ { "vddpa", 1304000, 1304000, 1 },
+ { "vddldo", 3000000, 3312000, 1 },
+ },
+ .num_vregs = 5,
+};
+
+static void qca_power_shutdown(struct hci_uart *hu)
+{
+ struct hci_dev *hdev = hu->hdev;
+
+ host_set_baudrate(hu, 2400);
+ qca_send_vendor_cmd(hdev, QCA_WCN3990_POWEROFF_PULSE);
+ qca_power_setup(hu, false);
+}
+
+static int qca_enable_regulator(struct qca_vreg vregs,
+ struct regulator *regulator)
+{
+ int ret;
+
+ ret = regulator_set_voltage(regulator, vregs.min_uV,
+ vregs.max_uV);
+ if (ret)
+ return ret;
+
+ if (vregs.load_uA)
+ ret = regulator_set_load(regulator,
+ vregs.load_uA);
+
+ if (ret)
+ return ret;
+
+ return regulator_enable(regulator);
+
+}
+
+static void qca_disable_regulator(struct qca_vreg vregs,
+ struct regulator *regulator)
+{
+ regulator_disable(regulator);
+ regulator_set_voltage(regulator, 0, vregs.max_uV);
+ if (vregs.load_uA)
+ regulator_set_load(regulator, 0);
+
+}
+
+static int qca_power_setup(struct hci_uart *hu, bool on)
+{
+ struct qca_vreg *vregs;
+ struct regulator_bulk_data *vreg_bulk;
+ struct qca_serdev *qcadev;
+ int i, num_vregs, ret = 0;
+
+ qcadev = serdev_device_get_drvdata(hu->serdev);
+ if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
+ !qcadev->bt_power->vreg_bulk)
+ return -EINVAL;
+
+ vregs = qcadev->bt_power->vreg_data->vregs;
+ vreg_bulk = qcadev->bt_power->vreg_bulk;
+ num_vregs = qcadev->bt_power->vreg_data->num_vregs;
+ BT_DBG("on: %d", on);
+ if (on && !qcadev->bt_power->vregs_on) {
+ for (i = 0; i < num_vregs; i++) {
+ ret = qca_enable_regulator(vregs[i],
+ vreg_bulk[i].consumer);
+ if (ret)
+ break;
+ }
+
+ if (ret) {
+ BT_ERR("failed to enable regulator:%s", vregs[i].name);
+ /* turn off regulators which are enabled */
+ for (i = i - 1; i >= 0; i--)
+ qca_disable_regulator(vregs[i],
+ vreg_bulk[i].consumer);
+ } else {
+ qcadev->bt_power->vregs_on = true;
+ }
+ } else if (!on && qcadev->bt_power->vregs_on) {
+ /* turn off regulator in reverse order */
+ i = qcadev->bt_power->vreg_data->num_vregs - 1;
+ for ( ; i >= 0; i--)
+ qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
+
+ qcadev->bt_power->vregs_on = false;
+ }
+
+ return ret;
+}
+
+static int qca_init_regulators(struct qca_power *qca,
+ const struct qca_vreg *vregs, size_t num_vregs)
+{
+ int i;
+
+ qca->vreg_bulk = devm_kzalloc(qca->dev, num_vregs *
+ sizeof(struct regulator_bulk_data),
+ GFP_KERNEL);
+ if (!qca->vreg_bulk)
+ return -ENOMEM;
+
+ for (i = 0; i < num_vregs; i++)
+ qca->vreg_bulk[i].supply = vregs[i].name;
+
+ return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
+}
+
static int qca_serdev_probe(struct serdev_device *serdev)
{
struct qca_serdev *qcadev;
+ const struct qca_vreg_data *data;
int err;

qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
@@ -1056,47 +1293,82 @@ static int qca_serdev_probe(struct serdev_device *serdev)
return -ENOMEM;

qcadev->serdev_hu.serdev = serdev;
+ data = of_device_get_match_data(&serdev->dev);
serdev_device_set_drvdata(serdev, qcadev);
+ if (data && data->soc_type == QCA_WCN3990) {
+ qcadev->btsoc_type = QCA_WCN3990;
+ qcadev->bt_power = devm_kzalloc(&serdev->dev,
+ sizeof(struct qca_power),
+ GFP_KERNEL);
+ if (!qcadev->bt_power)
+ return -ENOMEM;
+
+ qcadev->bt_power->dev = &serdev->dev;
+ qcadev->bt_power->vreg_data = data;
+ err = qca_init_regulators(qcadev->bt_power, data->vregs,
+ data->num_vregs);
+ if (err) {
+ BT_ERR("Failed to init regulators:%d", err);
+ goto out;
+ }

- qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
- GPIOD_OUT_LOW);
- if (IS_ERR(qcadev->bt_en)) {
- dev_err(&serdev->dev, "failed to acquire enable gpio\n");
- return PTR_ERR(qcadev->bt_en);
- }
+ qcadev->bt_power->vregs_on = false;
+ device_property_read_u32(&serdev->dev, "max-speed",
+ &qcadev->oper_speed);
+ if (!qcadev->oper_speed)
+ BT_INFO("UART will pick default operating speed");
+ err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
+ if (err) {
+ BT_ERR("wcn3990 serdev registration failed");
+ goto out;
+ }
+ } else {
+ qcadev->btsoc_type = QCA_ROME;
+ qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(qcadev->bt_en)) {
+ dev_err(&serdev->dev, "failed to acquire enable gpio\n");
+ return PTR_ERR(qcadev->bt_en);
+ }

- qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
- if (IS_ERR(qcadev->susclk)) {
- dev_err(&serdev->dev, "failed to acquire clk\n");
- return PTR_ERR(qcadev->susclk);
- }
+ qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
+ if (IS_ERR(qcadev->susclk)) {
+ dev_err(&serdev->dev, "failed to acquire clk\n");
+ return PTR_ERR(qcadev->susclk);
+ }

- err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
- if (err)
- return err;
+ err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
+ if (err)
+ return err;

- err = clk_prepare_enable(qcadev->susclk);
- if (err)
- return err;
+ err = clk_prepare_enable(qcadev->susclk);
+ if (err)
+ return err;

- err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
- if (err)
- clk_disable_unprepare(qcadev->susclk);
+ err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
+ if (err)
+ clk_disable_unprepare(qcadev->susclk);
+ }
+
+out: return err;

- return err;
}

static void qca_serdev_remove(struct serdev_device *serdev)
{
struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);

- hci_uart_unregister_device(&qcadev->serdev_hu);
+ if (qcadev->btsoc_type == QCA_WCN3990)
+ qca_power_shutdown(&qcadev->serdev_hu);
+ else
+ clk_disable_unprepare(qcadev->susclk);

- clk_disable_unprepare(qcadev->susclk);
+ hci_uart_unregister_device(&qcadev->serdev_hu);
}

static const struct of_device_id qca_bluetooth_of_match[] = {
{ .compatible = "qcom,qca6174-bt" },
+ { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project