From patchwork Tue Mar 20 03:23:31 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Escande X-Patchwork-Id: 10296235 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5A50E602B3 for ; Tue, 20 Mar 2018 03:24:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 48D631FF3E for ; Tue, 20 Mar 2018 03:24:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3B92E294F7; Tue, 20 Mar 2018 03:24:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 608AE1FF3E for ; Tue, 20 Mar 2018 03:24:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751788AbeCTDY2 (ORCPT ); Mon, 19 Mar 2018 23:24:28 -0400 Received: from mail-pf0-f194.google.com ([209.85.192.194]:38894 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751833AbeCTDYJ (ORCPT ); Mon, 19 Mar 2018 23:24:09 -0400 Received: by mail-pf0-f194.google.com with SMTP id d26so123203pfn.5 for ; Mon, 19 Mar 2018 20:24:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfert-encoding; bh=sp7MnEk79VJgbeNKgDH7pX5kXv0w+e7jYJSPeoCE2XU=; b=SxOSI9YMQ4EQYcJDwT3Kb+ksVb6hOs5UlLvv7qi7IEafQm5LPyOKVYvThhodWFUGof UHxPKz5vjQoE4goezla5NjRX48hq6n+hHIYJ1bAfq/XyOq/CYoTeYh6hg4NVE8GVkhFe M3MHuGFoqbQ345AxO5NkSfA9K5du2fRt35ZDo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfert-encoding; bh=sp7MnEk79VJgbeNKgDH7pX5kXv0w+e7jYJSPeoCE2XU=; b=BonHAMbdJCWEYqLLbdhl25E0jyKqfNWcnWMJ/qkxg+adq64+aEo1OflXUJGuStxUM7 wnm5cFv62j/7bC069C2eaemMQN9F/5PgkAMMEeMN5S7R/KLvdHSoCPCJMhDLjDrbbdlS FP4PJXia8RUEJH08mBylbXkvGE7wDRAaITdMjHaU9OwMIbbTONSgciMNYvY33R7jTaMl mBbp3xmLiXcCK4Is9yMWkKnLzMJnIxDfxc+4FnuyJ4pUI86ara7XgsFHuSs0fcHO04gF zElr55Jq5dB5XBE8V9Kuy1bY4RBrpkKpB33OKihI0btteLF5F5ChAaakRQRLzIqaruK6 Nb6A== X-Gm-Message-State: AElRT7EJERMB2kjHcxxkdGiZ3kb5uluj+q/7LFafCbetfjyweAITcWup czcJnqOwd2EMDe/9MCPoQOxkog== X-Google-Smtp-Source: AG47ELsOwE1tP4t+XJzbilDrN+VbSDnoV0hle6qhhWfDqQhTzxu674NPKfSPhuMZDKvVppoidKwdvA== X-Received: by 10.101.96.205 with SMTP id r13mr1764455pgv.427.1521516249220; Mon, 19 Mar 2018 20:24:09 -0700 (PDT) Received: from localhost.localdomain ([218.255.99.6]) by smtp.gmail.com with ESMTPSA id c14sm741286pfn.185.2018.03.19.20.24.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 19 Mar 2018 20:24:08 -0700 (PDT) From: Thierry Escande To: Rob Herring , Andy Gross , Marcel Holtmann , Johan Hedberg , David Brown , Mark Rutland Cc: Andy Shevchenko , Loic Poulain , Bjorn Andersson , Srinivas Kandagatla , linux-bluetooth@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 3/3] Bluetooth: hci_qca: Add serdev support Date: Tue, 20 Mar 2018 04:23:31 +0100 Message-Id: <20180320032331.29865-4-thierry.escande@linaro.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20180320032331.29865-1-thierry.escande@linaro.org> References: <20180320032331.29865-1-thierry.escande@linaro.org> MIME-Version: 1.0 Content-Transfert-Encoding: 8bit Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Andy Shevchenko --- v5: - Use gpio new name 'enable' v4: - Rename divclk4 as susclk (its name in the bt chip) - Use gpiod_set_value_cansleep() - Replace #include with - Restore dependency on BT_HCIUART v3: - Remove redundant call to gpiod_set_value() after devm_gpiod_get() - Check returned values for clk_set_rate() and clk_prepare_enable() - Use clk_disable_unprepare() v2: - Fix author email drivers/bluetooth/Kconfig | 1 + drivers/bluetooth/hci_qca.c | 109 +++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 108 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig index 07e55cd8f8c8..e0f1a6609b68 100644 --- a/drivers/bluetooth/Kconfig +++ b/drivers/bluetooth/Kconfig @@ -196,6 +196,7 @@ config BT_HCIUART_BCM config BT_HCIUART_QCA bool "Qualcomm Atheros protocol support" depends on BT_HCIUART + depends on BT_HCIUART_SERDEV select BT_HCIUART_H4 select BT_QCA help diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index 05ec530b8a3a..6e6042f77784 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -29,7 +29,11 @@ */ #include +#include #include +#include +#include +#include #include #include @@ -50,6 +54,9 @@ #define IBS_TX_IDLE_TIMEOUT_MS 2000 #define BAUDRATE_SETTLE_TIMEOUT_MS 300 +/* susclk rate */ +#define SUSCLK_RATE_32KHZ 32768 + /* HCI_IBS transmit side sleep protocol states */ enum tx_ibs_states { HCI_IBS_TX_ASLEEP, @@ -111,6 +118,12 @@ struct qca_data { u64 votes_off; }; +struct qca_serdev { + struct hci_uart serdev_hu; + struct gpio_desc *bt_en; + struct clk *susclk; +}; + static void __serial_clock_on(struct tty_struct *tty) { /* TODO: Some chipset requires to enable UART clock on client @@ -386,6 +399,7 @@ static void hci_ibs_wake_retrans_timeout(struct timer_list *t) /* Initialize protocol */ static int qca_open(struct hci_uart *hu) { + struct qca_serdev *qcadev; struct qca_data *qca; BT_DBG("hu %p qca_open", hu); @@ -444,6 +458,13 @@ static int qca_open(struct hci_uart *hu) 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); + } + BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u", qca->tx_idle_delay, qca->wake_retrans); @@ -512,6 +533,7 @@ static int qca_flush(struct hci_uart *hu) /* Close protocol */ static int qca_close(struct hci_uart *hu) { + struct qca_serdev *qcadev; struct qca_data *qca = hu->priv; BT_DBG("hu %p qca close", hu); @@ -525,6 +547,13 @@ static int qca_close(struct hci_uart *hu) destroy_workqueue(qca->workqueue); 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); + } + kfree_skb(qca->rx_skb); hu->priv = NULL; @@ -885,6 +914,14 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) return 0; } +static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) +{ + if (hu->serdev) + serdev_device_set_baudrate(hu->serdev, speed); + else + hci_uart_set_baudrate(hu, speed); +} + static int qca_setup(struct hci_uart *hu) { struct hci_dev *hdev = hu->hdev; @@ -905,7 +942,7 @@ static int qca_setup(struct hci_uart *hu) speed = hu->proto->init_speed; if (speed) - hci_uart_set_baudrate(hu, speed); + host_set_baudrate(hu, speed); /* Setup user speed if needed */ speed = 0; @@ -924,7 +961,7 @@ static int qca_setup(struct hci_uart *hu) ret); return ret; } - hci_uart_set_baudrate(hu, speed); + host_set_baudrate(hu, speed); } /* Setup patch / NVM configurations */ @@ -958,12 +995,80 @@ static struct hci_uart_proto qca_proto = { .dequeue = qca_dequeue, }; +static int qca_serdev_probe(struct serdev_device *serdev) +{ + struct qca_serdev *qcadev; + int err; + + qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL); + if (!qcadev) + return -ENOMEM; + + qcadev->serdev_hu.serdev = serdev; + serdev_device_set_drvdata(serdev, qcadev); + + 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 bt-disable-n 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); + } + + err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ); + 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); + + 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); + + clk_disable_unprepare(qcadev->susclk); +} + +static const struct of_device_id qca_bluetooth_of_match[] = { + { .compatible = "qcom,qca6174-bt" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match); + +static struct serdev_device_driver qca_serdev_driver = { + .probe = qca_serdev_probe, + .remove = qca_serdev_remove, + .driver = { + .name = "hci_uart_qca", + .of_match_table = qca_bluetooth_of_match, + }, +}; + int __init qca_init(void) { + serdev_device_driver_register(&qca_serdev_driver); + return hci_uart_register_proto(&qca_proto); } int __exit qca_deinit(void) { + serdev_device_driver_unregister(&qca_serdev_driver); + return hci_uart_unregister_proto(&qca_proto); }