Bluetooth: hci_qca: Add serdev support
Add support for Qualcomm serial slave devices. Probe the serial device, retrieve its maximum speed and register a new hci uart device. Signed-off-by: Thierry Escande <thierry.escande@linaro.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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@ -197,6 +197,7 @@ config BT_HCIUART_BCM
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config BT_HCIUART_QCA
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bool "Qualcomm Atheros protocol support"
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depends on BT_HCIUART
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depends on BT_HCIUART_SERDEV
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select BT_HCIUART_H4
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select BT_QCA
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help
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@ -29,7 +29,12 @@
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*/
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/debugfs.h>
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#include <linux/gpio/consumer.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/serdev.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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@ -50,6 +55,9 @@
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#define IBS_TX_IDLE_TIMEOUT_MS 2000
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#define BAUDRATE_SETTLE_TIMEOUT_MS 300
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/* susclk rate */
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#define SUSCLK_RATE_32KHZ 32768
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/* HCI_IBS transmit side sleep protocol states */
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enum tx_ibs_states {
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HCI_IBS_TX_ASLEEP,
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@ -111,6 +119,12 @@ struct qca_data {
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u64 votes_off;
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};
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struct qca_serdev {
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struct hci_uart serdev_hu;
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struct gpio_desc *bt_en;
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struct clk *susclk;
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};
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static void __serial_clock_on(struct tty_struct *tty)
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{
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/* TODO: Some chipset requires to enable UART clock on client
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@ -386,6 +400,7 @@ static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
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/* Initialize protocol */
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static int qca_open(struct hci_uart *hu)
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{
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struct qca_serdev *qcadev;
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struct qca_data *qca;
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BT_DBG("hu %p qca_open", hu);
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@ -444,6 +459,13 @@ static int qca_open(struct hci_uart *hu)
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timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
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qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
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if (hu->serdev) {
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serdev_device_open(hu->serdev);
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qcadev = serdev_device_get_drvdata(hu->serdev);
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gpiod_set_value_cansleep(qcadev->bt_en, 1);
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}
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BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
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qca->tx_idle_delay, qca->wake_retrans);
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@ -512,6 +534,7 @@ static int qca_flush(struct hci_uart *hu)
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/* Close protocol */
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static int qca_close(struct hci_uart *hu)
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{
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struct qca_serdev *qcadev;
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struct qca_data *qca = hu->priv;
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BT_DBG("hu %p qca close", hu);
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@ -525,6 +548,13 @@ static int qca_close(struct hci_uart *hu)
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destroy_workqueue(qca->workqueue);
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qca->hu = NULL;
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if (hu->serdev) {
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serdev_device_close(hu->serdev);
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qcadev = serdev_device_get_drvdata(hu->serdev);
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gpiod_set_value_cansleep(qcadev->bt_en, 0);
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}
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kfree_skb(qca->rx_skb);
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hu->priv = NULL;
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@ -885,6 +915,14 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
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return 0;
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}
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static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
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{
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if (hu->serdev)
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serdev_device_set_baudrate(hu->serdev, speed);
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else
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hci_uart_set_baudrate(hu, speed);
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}
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static int qca_setup(struct hci_uart *hu)
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{
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struct hci_dev *hdev = hu->hdev;
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@ -905,7 +943,7 @@ static int qca_setup(struct hci_uart *hu)
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speed = hu->proto->init_speed;
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if (speed)
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hci_uart_set_baudrate(hu, speed);
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host_set_baudrate(hu, speed);
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/* Setup user speed if needed */
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speed = 0;
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@ -924,7 +962,7 @@ static int qca_setup(struct hci_uart *hu)
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ret);
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return ret;
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}
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hci_uart_set_baudrate(hu, speed);
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host_set_baudrate(hu, speed);
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}
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/* Setup patch / NVM configurations */
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@ -964,12 +1002,80 @@ static struct hci_uart_proto qca_proto = {
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.dequeue = qca_dequeue,
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};
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static int qca_serdev_probe(struct serdev_device *serdev)
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{
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struct qca_serdev *qcadev;
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int err;
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qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
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if (!qcadev)
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return -ENOMEM;
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qcadev->serdev_hu.serdev = serdev;
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serdev_device_set_drvdata(serdev, qcadev);
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qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
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GPIOD_OUT_LOW);
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if (IS_ERR(qcadev->bt_en)) {
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dev_err(&serdev->dev, "failed to acquire enable gpio\n");
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return PTR_ERR(qcadev->bt_en);
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}
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qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
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if (IS_ERR(qcadev->susclk)) {
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dev_err(&serdev->dev, "failed to acquire clk\n");
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return PTR_ERR(qcadev->susclk);
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}
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err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
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if (err)
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return err;
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err = clk_prepare_enable(qcadev->susclk);
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if (err)
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return err;
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err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
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if (err)
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clk_disable_unprepare(qcadev->susclk);
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return err;
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}
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static void qca_serdev_remove(struct serdev_device *serdev)
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{
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struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
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hci_uart_unregister_device(&qcadev->serdev_hu);
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clk_disable_unprepare(qcadev->susclk);
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}
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static const struct of_device_id qca_bluetooth_of_match[] = {
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{ .compatible = "qcom,qca6174-bt" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
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static struct serdev_device_driver qca_serdev_driver = {
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.probe = qca_serdev_probe,
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.remove = qca_serdev_remove,
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.driver = {
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.name = "hci_uart_qca",
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.of_match_table = qca_bluetooth_of_match,
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},
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};
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int __init qca_init(void)
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{
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serdev_device_driver_register(&qca_serdev_driver);
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return hci_uart_register_proto(&qca_proto);
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}
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int __exit qca_deinit(void)
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{
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serdev_device_driver_unregister(&qca_serdev_driver);
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return hci_uart_unregister_proto(&qca_proto);
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}
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