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 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 | 6 +
drivers/bluetooth/hci_qca.c | 419 ++++++++++++++++++++++++++++++++----
2 files changed, 381 insertions(+), 44 deletions(-)
diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
index e93e0660cf6c..2e551b029970 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 CHEROKEE_POWERON_PULSE 0xFC
+#define CHEROKEE_POWEROFF_PULSE 0xC0
+
enum qca_bardrate {
QCA_BAUDRATE_115200 = 0,
QCA_BAUDRATE_57600,
@@ -124,6 +127,9 @@ struct tlv_type_hdr {
__u8 data[0];
} __packed;
+int qca_btsoc_power_setup(struct hci_uart *hu, bool on);
+int qca_btsoc_shutdown(struct hci_dev *hdev);
+
#if IS_ENABLED(CONFIG_BT_QCA)
int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr);
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index cb1034998040..e235be0e5202 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>
@@ -119,10 +124,48 @@ struct qca_data {
u64 votes_off;
};
+enum qca_btsoc_type {
+ BTQCA_INVALID = -1,
+ BTQCA_AR3002,
+ BTQCA_ROME,
+ BTQCA_CHEROKEE
+};
+
+/*
+ * 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 void __serial_clock_on(struct tty_struct *tty)
@@ -402,6 +445,7 @@ static int qca_open(struct hci_uart *hu)
{
struct qca_serdev *qcadev;
struct qca_data *qca;
+ int ret = 0;
BT_DBG("hu %p qca_open", hu);
@@ -463,13 +507,19 @@ static int qca_open(struct hci_uart *hu)
serdev_device_open(hu->serdev);
qcadev = serdev_device_get_drvdata(hu->serdev);
- gpiod_set_value_cansleep(qcadev->bt_en, 1);
+ if (qcadev->btsoc_type == BTQCA_CHEROKEE) {
+ hu->init_speed = qcadev->init_speed;
+ hu->oper_speed = qcadev->oper_speed;
+ ret = qca_btsoc_power_setup(hu, true);
+ } else {
+ gpiod_set_value_cansleep(qcadev->bt_en, 1);
+ }
}
BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
qca->tx_idle_delay, qca->wake_retrans);
- return 0;
+ return ret;
}
static void qca_debugfs_init(struct hci_dev *hdev)
@@ -552,7 +602,10 @@ static int qca_close(struct hci_uart *hu)
serdev_device_close(hu->serdev);
qcadev = serdev_device_get_drvdata(hu->serdev);
- gpiod_set_value_cansleep(qcadev->bt_en, 0);
+ if (qcadev->btsoc_type == BTQCA_CHEROKEE)
+ qca_btsoc_shutdown(hu->hdev);
+ else
+ gpiod_set_value_cansleep(qcadev->bt_en, 0);
}
kfree_skb(qca->rx_skb);
@@ -925,20 +978,36 @@ static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
hci_uart_set_baudrate(hu, speed);
}
-static int qca_setup(struct hci_uart *hu)
+static int qca_send_vendor_cmd(struct hci_dev *hdev, u8 cmd)
{
- struct hci_dev *hdev = hu->hdev;
+ struct hci_uart *hu = hci_get_drvdata(hdev);
struct qca_data *qca = hu->priv;
- unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
- int ret;
+ struct sk_buff *skb;
- bt_dev_info(hdev, "ROME setup");
+ bt_dev_dbg(hdev, "sending command %02x to SoC", cmd);
- /* Patch downloading has to be done without IBS mode */
- clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
+ skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
+ if (!skb) {
+ bt_dev_err(hdev, "Failed to allocate memory for skb packet");
+ return -ENOMEM;
+ }
+
+ skb_put_data(skb, &cmd, sizeof(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 void qca_set_init_speed(struct hci_uart *hu)
+{
+ unsigned int speed = 0;
- /* Setup initial baudrate */
- speed = 0;
if (hu->init_speed)
speed = hu->init_speed;
else if (hu->proto->init_speed)
@@ -946,29 +1015,136 @@ static int qca_setup(struct hci_uart *hu)
if (speed)
host_set_baudrate(hu, speed);
+}
+
+static int qca_set_operating_speed(struct hci_uart *hu, u32 *qca_baudrate)
+{
+ unsigned int speed = 0;
+ int ret;
- /* Setup user speed if needed */
- speed = 0;
if (hu->oper_speed)
speed = hu->oper_speed;
else if (hu->proto->oper_speed)
speed = hu->proto->oper_speed;
if (speed) {
- qca_baudrate = qca_get_baudrate_value(speed);
-
- bt_dev_info(hdev, "Set UART speed to %d", speed);
- ret = qca_set_baudrate(hdev, qca_baudrate);
+ *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);
if (ret) {
- bt_dev_err(hdev, "Failed to change the baud rate (%d)",
+ bt_dev_err(hu->hdev, "Failed to change the baud rate (%d)",
ret);
return ret;
}
host_set_baudrate(hu, speed);
}
- /* Setup patch / NVM configurations */
- ret = qca_uart_setup_rome(hdev, qca_baudrate);
+ return ret;
+}
+
+int qca_btsoc_shutdown(struct hci_dev *hdev)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+
+ /* change host baud rate before sending power off command */
+ host_set_baudrate(hu, 2400);
+ qca_send_vendor_cmd(hdev, CHEROKEE_POWEROFF_PULSE);
+ /* turn off btsoc */
+ return qca_btsoc_power_setup(hu, false);
+}
+
+static int qca_setup(struct hci_uart *hu)
+{
+ struct hci_dev *hdev = hu->hdev;
+ struct qca_data *qca = hu->priv;
+ struct qca_serdev *qcadev;
+ unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
+ int ret;
+ int soc_ver;
+
+ qcadev = serdev_device_get_drvdata(hu->serdev);
+
+ switch (qcadev->btsoc_type) {
+ case BTQCA_CHEROKEE:
+ bt_dev_dbg(hdev, "setting up wcn3990");
+ /* Patch downloading has to be done without IBS mode */
+ clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
+ qca_set_init_speed(hu);
+ hci_uart_set_flow_control(hu, true);
+ ret = qca_send_vendor_cmd(hdev, CHEROKEE_POWERON_PULSE);
+ if (ret) {
+ bt_dev_err(hdev, "failed to send power on command");
+ return ret;
+ }
+
+ /* Close and re-open the port */
+ serdev_device_close(hu->serdev);
+ ret = serdev_device_open(hu->serdev);
+ if (ret) {
+ bt_dev_err(hdev, "failed to open port");
+ return ret;
+ }
+
+ qca_set_init_speed(hu);
+ hci_uart_set_flow_control(hu, false);
+ msleep(100);
+ ret = qca_patch_ver_req(hdev, &soc_ver);
+ if (ret < 0 || soc_ver == 0) {
+ bt_dev_err(hdev, "Failed to get version 0x%x", ret);
+ return ret;
+ }
+
+ bt_dev_info(hdev, "wcn3990 controller version 0x%08x", soc_ver);
+ hci_uart_set_flow_control(hu, true);
+ ret = qca_set_operating_speed(hu, &qca_baudrate);
+ if (ret)
+ return ret;
+ hci_uart_set_flow_control(hu, false);
+ /* Setup patch and NVM configurations */
+ ret = qca_uart_setup_cherokee(hdev, qca_baudrate, &soc_ver);
+
+ break;
+
+ default:
+ bt_dev_info(hdev, "ROME setup");
+
+ /* Patch downloading has to be done without IBS mode */
+ clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
+
+ /* Setup initial baudrate */
+ speed = 0;
+ if (hu->init_speed)
+ speed = hu->init_speed;
+ else if (hu->proto->init_speed)
+ speed = hu->proto->init_speed;
+
+ if (speed)
+ host_set_baudrate(hu, speed);
+
+ /* Setup user speed if needed */
+ speed = 0;
+ if (hu->oper_speed)
+ speed = hu->oper_speed;
+ else if (hu->proto->oper_speed)
+ speed = hu->proto->oper_speed;
+
+ if (speed) {
+ qca_baudrate = qca_get_baudrate_value(speed);
+
+ bt_dev_info(hdev, "Set UART speed to %d", speed);
+ ret = qca_set_baudrate(hdev, qca_baudrate);
+ if (ret) {
+ bt_dev_err(hdev, "Failed to change the baud rate (%d)",
+ ret);
+ return ret;
+ }
+ host_set_baudrate(hu, speed);
+ }
+
+ /* Setup patch / NVM configurations */
+ ret = qca_uart_setup_rome(hdev, qca_baudrate);
+ }
+
if (!ret) {
set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
qca_debugfs_init(hdev);
@@ -1004,9 +1180,120 @@ static struct hci_uart_proto qca_proto = {
.dequeue = qca_dequeue,
};
+static const struct qca_vreg_data qca_cherokee_data = {
+ .soc_type = BTQCA_CHEROKEE,
+ .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 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)
+ goto out;
+
+ if (vregs.load_uA)
+ ret = regulator_set_load(regulator,
+ vregs.load_uA);
+
+ if (ret)
+ goto out;
+
+ ret = regulator_enable(regulator);
+
+out:
+ return ret;
+
+}
+
+static void qca_disable_regulator(struct qca_vreg vregs,
+ struct regulator *regulator)
+{
+ /* Disable the regulator if requested by user
+ * or when fault to enable any regulator.
+ */
+ regulator_disable(regulator);
+ regulator_set_voltage(regulator, 0, vregs.max_uV);
+ if (vregs.load_uA)
+ regulator_set_load(regulator, 0);
+
+}
+
+int qca_btsoc_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;
+ }
+ /* regulators failed */
+ 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);
@@ -1014,34 +1301,72 @@ static int qca_serdev_probe(struct serdev_device *serdev)
return -ENOMEM;
qcadev->serdev_hu.serdev = serdev;
+ data = of_device_get_match_data(&serdev->dev);
+ if (data && data->soc_type == BTQCA_CHEROKEE)
+ qcadev->btsoc_type = BTQCA_CHEROKEE;
+ else
+ qcadev->btsoc_type = BTQCA_ROME;
+
serdev_device_set_drvdata(serdev, qcadev);
+ if (qcadev->btsoc_type == BTQCA_CHEROKEE) {
+ 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);
+ devm_kfree(&serdev->dev, qcadev->bt_power->vreg_bulk);
+ devm_kfree(&serdev->dev, qcadev->bt_power);
+ 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");
+ devm_kfree(&serdev->dev, qcadev->bt_power->vreg_bulk);
+ devm_kfree(&serdev->dev, qcadev->bt_power);
+ goto out;
+ }
+ } else {
+ 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)
@@ -1050,11 +1375,17 @@ static void qca_serdev_remove(struct serdev_device *serdev)
hci_uart_unregister_device(&qcadev->serdev_hu);
- clk_disable_unprepare(qcadev->susclk);
+ if (qcadev->btsoc_type == BTQCA_CHEROKEE) {
+ devm_kfree(&serdev->dev, qcadev->bt_power->vreg_bulk);
+ devm_kfree(&serdev->dev, qcadev->bt_power);
+ } else {
+ clk_disable_unprepare(qcadev->susclk);
+ }
}
static const struct of_device_id qca_bluetooth_of_match[] = {
{ .compatible = "qcom,qca6174-bt" },
+ { .compatible = "qcom,wcn3990-bt", .data = &qca_cherokee_data},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
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