From patchwork Wed Dec 13 13:00:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manikanta Guntupalli X-Patchwork-Id: 755394 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="4/4JaJIv" Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2064.outbound.protection.outlook.com [40.107.243.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88C8310A; Wed, 13 Dec 2023 05:00:52 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=SmNRtL+dBEh9ZTtnmZEGMvXJt5qrP/wttLS97izRe5pd1cSGNOjDdsWTxDzhqJv4JfdonaM3DGdO/isTrwNJLiillAdVRkNdE7yCO5Zm2To+xXQCVv8b6k3dCQAsCMlfRR3v6N5GpbmFcvfiz0JcmndkevaLGaQMemjLJeiBkXVj4Agul7X451UVO+8Jzkruuax98d2QyaIUrNRU3eqiYqgvwlnINM+PP34TNiQdXp/QxQuJSsMcTRKvIzoBtC6HSEh8+GUnjgf0veDhyGSCneAPy1AniUSsXVeeGys86d6JrAHTcDyrdMfe82cfBDLDceKcsPxN3fC8eIPzZtZDdg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=jfipSkX2ShXVH2nLxMrS4KxI3KEEX1macjPlZrRk+rs=; b=JGb41g+44l8wukCFQj0m9kQW7EgXq6ZznBDmaZUNtt7OOXW+fEzqkko3u57MP3yt2dx4N+dQVsxuKqvyUra24Ow/pz+jTPMyWQYP6XcqnJjL28auQ34JE57SQhwyhhV2G4OYqGxx+QyVuwdSVrtBxAeWDJjOfJRZ4qvShfu9sp5Als4fO7YipY+rBcc0jHZ4MqEKPkHKk6D2ClP0nOEoL70gp066tWlyv+0Q1DnrP6R6Ods34XBq0VfErAz8jhXF36OuSn0L5/T2QFPJgB56SfWusaN1MfcaPnZ3pIV5F3oLrRo8SgyDDiNT5T7R68H+EkAPBOx5t8Mxvfm+e76ZlA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=linuxfoundation.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=jfipSkX2ShXVH2nLxMrS4KxI3KEEX1macjPlZrRk+rs=; b=4/4JaJIv4lJtUF3sJaUlsfJCQVFyrAxAX4ljI0ebxZwxgMbKZikYTNuoLuAq+zsPTXp4yLdWUIaJLdcY3MhRN/GUKfDITVOrhJUUzNq0UppqpXIPm/ozKsFDD4ZzCHYGnDJjD1CQM44XXi4/xhTpLTc5DjDfK/V+1DYzmvx+McU= Received: from CY5PR15CA0225.namprd15.prod.outlook.com (2603:10b6:930:88::26) by SA1PR12MB8162.namprd12.prod.outlook.com (2603:10b6:806:33a::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7068.33; Wed, 13 Dec 2023 13:00:48 +0000 Received: from CY4PEPF0000E9D4.namprd03.prod.outlook.com (2603:10b6:930:88:cafe::ea) by CY5PR15CA0225.outlook.office365.com (2603:10b6:930:88::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7091.26 via Frontend Transport; Wed, 13 Dec 2023 13:00:48 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CY4PEPF0000E9D4.mail.protection.outlook.com (10.167.241.147) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7091.26 via Frontend Transport; Wed, 13 Dec 2023 13:00:47 +0000 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.34; Wed, 13 Dec 2023 07:00:46 -0600 Received: from xhdsgoud40.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2507.34 via Frontend Transport; Wed, 13 Dec 2023 07:00:42 -0600 From: Manikanta Guntupalli To: , , , , , , , , , , CC: , , , , Manikanta Guntupalli Subject: [PATCH V5 3/3] tty: serial: uartps: Add rs485 support to uartps driver Date: Wed, 13 Dec 2023 18:30:23 +0530 Message-ID: <20231213130023.606486-4-manikanta.guntupalli@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231213130023.606486-1-manikanta.guntupalli@amd.com> References: <20231213130023.606486-1-manikanta.guntupalli@amd.com> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9D4:EE_|SA1PR12MB8162:EE_ X-MS-Office365-Filtering-Correlation-Id: a530651e-1f2d-4e48-00fa-08dbfbdb86b7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230031)(4636009)(39860400002)(396003)(136003)(376002)(346002)(230922051799003)(451199024)(1800799012)(82310400011)(64100799003)(186009)(40470700004)(36840700001)(46966006)(426003)(40460700003)(336012)(83380400001)(26005)(1076003)(2616005)(36860700001)(44832011)(47076005)(8936002)(5660300002)(4326008)(41300700001)(7416002)(2906002)(8676002)(6666004)(316002)(30864003)(478600001)(54906003)(70206006)(110136005)(70586007)(36756003)(86362001)(356005)(81166007)(921008)(82740400003)(40480700001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Dec 2023 13:00:47.8513 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a530651e-1f2d-4e48-00fa-08dbfbdb86b7 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9D4.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB8162 Add rs485 support to uartps driver. Use either rts-gpios or RTS to control RS485 phy as driver or a receiver. Signed-off-by: Manikanta Guntupalli --- Changes for V2: Modify optional gpio name to xlnx,phy-ctrl-gpios. Update commit description. Add support for RTS, delay_rts_before_send and delay_rts_after_send in RS485 mode. Changes for V3: Modify optional gpio name to rts-gpios. Update commit description. Move cdns_uart_tx_empty function to avoid prototype statement. Remove assignment of struct serial_rs485 to port->rs485 as serial core performs that. Switch to native RTS in non GPIO case. Handle rs485 during stop tx. Remove explicit calls to configure gpio direction and value, as devm_gpiod_get_optional performs that by using GPIOD_OUT_LOW argument. Update implementation to support configuration of GPIO/RTS value based on user configuration of SER_RS485_RTS_ON_SEND and SER_RS485_RTS_AFTER_SEND. Move implementation to start_tx from handle_tx. Changes for V4: Create separate patch for cdns_uart_tx_empty relocation. Call cdns_rs485_rx_setup() before uart_add_one_port() in probe. Update gpio descriptor name to gpiod_rts. Instead of cdns_rs485_config_gpio_rts_high() and cdns_rs485_config_gpio_rts_low() functions for RTS/GPIO value configuration implement cdns_rts_gpio_enable(). Disable auto rts and call cdns_uart_stop_tx() from cdns_rs485_config. Use timer instead of mdelay for delay_rts_before_send and delay_rts_after_send. Update cdns_uart_set_mctrl to support GPIO/RTS. Changes for V5: None. --- drivers/tty/serial/xilinx_uartps.c | 214 +++++++++++++++++++++++++++-- 1 file changed, 205 insertions(+), 9 deletions(-) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index aafcc2179e0e..3e1045896812 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -22,7 +22,9 @@ #include #include #include -#include +#include +#include +#include #define CDNS_UART_TTY_NAME "ttyPS" #define CDNS_UART_NAME "xuartps" @@ -193,6 +195,10 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); * @clk_rate_change_nb: Notifier block for clock changes * @quirks: Flags for RXBS support. * @cts_override: Modem control state override + * @gpiod_rts: Pointer to the gpio descriptor + * @rs485_tx_started: RS485 tx state + * @timer: Timer for tx and rx + * @stop_tx_timer: Timer for stop tx */ struct cdns_uart { struct uart_port *port; @@ -203,10 +209,22 @@ struct cdns_uart { struct notifier_block clk_rate_change_nb; u32 quirks; bool cts_override; + struct gpio_desc *gpiod_rts; + bool rs485_tx_started; + struct timer_list timer; + struct timer_list stop_tx_timer; }; struct cdns_platform_data { u32 quirks; }; + +struct serial_rs485 cdns_rs485_supported = { + .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | + SER_RS485_RTS_AFTER_SEND, + .delay_rts_before_send = 1, + .delay_rts_after_send = 1, +}; + #define to_cdns_uart(_nb) container_of(_nb, struct cdns_uart, \ clk_rate_change_nb) @@ -305,6 +323,55 @@ static void cdns_uart_handle_rx(void *dev_id, unsigned int isrstatus) tty_flip_buffer_push(&port->state->port); } +/** + * cdns_rts_gpio_enable - Configure RTS/GPIO to high/low + * @cdns_uart: Handle to the cdns_uart + * @enable: Value to be set to RTS/GPIO + */ +static void cdns_rts_gpio_enable(struct cdns_uart *cdns_uart, bool enable) +{ + u32 val; + + if (cdns_uart->gpiod_rts) { + gpiod_set_value(cdns_uart->gpiod_rts, enable); + } else { + val = readl(cdns_uart->port->membase + CDNS_UART_MODEMCR); + if (enable) + val &= ~CDNS_UART_MODEMCR_RTS; + else + val |= CDNS_UART_MODEMCR_RTS; + writel(val, cdns_uart->port->membase + CDNS_UART_MODEMCR); + } +} + +/** + * cdns_rs485_tx_setup - Tx setup specific to rs485 + * @cdns_uart: Handle to the cdns_uart + */ +static void cdns_rs485_tx_setup(struct cdns_uart *cdns_uart) +{ + if (cdns_uart->port->rs485.flags & SER_RS485_RTS_ON_SEND) + cdns_rts_gpio_enable(cdns_uart, 1); + else + cdns_rts_gpio_enable(cdns_uart, 0); + + cdns_uart->rs485_tx_started = true; +} + +/** + * cdns_rs485_rx_setup - Rx setup specific to rs485 + * @cdns_uart: Handle to the cdns_uart + */ +static void cdns_rs485_rx_setup(struct cdns_uart *cdns_uart) +{ + if (cdns_uart->port->rs485.flags & SER_RS485_RTS_AFTER_SEND) + cdns_rts_gpio_enable(cdns_uart, 1); + else + cdns_rts_gpio_enable(cdns_uart, 0); + + cdns_uart->rs485_tx_started = false; +} + /** * cdns_uart_tx_empty - Check whether TX is empty * @port: Handle to the uart port structure @@ -579,6 +646,42 @@ static int cdns_uart_clk_notifier_cb(struct notifier_block *nb, } #endif +/** + * cdns_rs485_rx_callback - Timer rx callback handler for rs485. + * @t: Handle to the timer list structure + */ +static void cdns_rs485_rx_callback(struct timer_list *t) +{ + struct cdns_uart *cdns_uart = from_timer(cdns_uart, t, timer); + + /* + * Default Rx should be setup, because Rx signaling path + * need to enable to receive data. + */ + cdns_rs485_rx_setup(cdns_uart); +} + +/** + * cdns_rs485_tx_callback - Timer tx callback handler for rs485. + * @t: Handle to the timer list structure + */ +static void cdns_rs485_tx_callback(struct timer_list *t) +{ + struct cdns_uart *cdns_uart = from_timer(cdns_uart, t, timer); + + cdns_uart_handle_tx(cdns_uart->port); + + /* Enable the TX Empty interrupt */ + writel(CDNS_UART_IXR_TXEMPTY, cdns_uart->port->membase + CDNS_UART_IER); + + if (uart_circ_empty(&cdns_uart->port->state->xmit) || + uart_tx_stopped(cdns_uart->port)) { + timer_setup(&cdns_uart->timer, cdns_rs485_rx_callback, 0); + mod_timer(&cdns_uart->timer, jiffies + + msecs_to_jiffies(cdns_uart->port->rs485.delay_rts_after_send)); + } +} + /** * cdns_uart_start_tx - Start transmitting bytes * @port: Handle to the uart port structure @@ -586,6 +689,7 @@ static int cdns_uart_clk_notifier_cb(struct notifier_block *nb, static void cdns_uart_start_tx(struct uart_port *port) { unsigned int status; + struct cdns_uart *cdns_uart = port->private_data; if (uart_tx_stopped(port)) return; @@ -604,10 +708,40 @@ static void cdns_uart_start_tx(struct uart_port *port) writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_ISR); - cdns_uart_handle_tx(port); + if (cdns_uart->port->rs485.flags & SER_RS485_ENABLED) { + if (!cdns_uart->rs485_tx_started) { + timer_setup(&cdns_uart->timer, + cdns_rs485_tx_callback, 0); + cdns_rs485_tx_setup(cdns_uart); + mod_timer(&cdns_uart->timer, jiffies + + msecs_to_jiffies(port->rs485.delay_rts_before_send)); + } else { + if (!timer_pending(&cdns_uart->timer)) + mod_timer(&cdns_uart->timer, jiffies); + } + } else { + cdns_uart_handle_tx(port); - /* Enable the TX Empty interrupt */ - writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IER); + /* Enable the TX Empty interrupt */ + writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IER); + } +} + +/** + * cdns_rs485_stop_tx_callback - Timer stop tx callback handler for rs485. + * @t: Handle to the timer list structure + */ +static void cdns_rs485_stop_tx_callback(struct timer_list *t) +{ + unsigned int regval; + struct cdns_uart *cdns_uart = from_timer(cdns_uart, t, stop_tx_timer); + + cdns_rs485_rx_setup(cdns_uart); + + regval = readl(cdns_uart->port->membase + CDNS_UART_CR); + regval |= CDNS_UART_CR_TX_DIS; + /* Disable the transmitter */ + writel(regval, cdns_uart->port->membase + CDNS_UART_CR); } /** @@ -617,11 +751,19 @@ static void cdns_uart_start_tx(struct uart_port *port) static void cdns_uart_stop_tx(struct uart_port *port) { unsigned int regval; + struct cdns_uart *cdns_uart = port->private_data; - regval = readl(port->membase + CDNS_UART_CR); - regval |= CDNS_UART_CR_TX_DIS; - /* Disable the transmitter */ - writel(regval, port->membase + CDNS_UART_CR); + if ((cdns_uart->port->rs485.flags & SER_RS485_ENABLED) && + !timer_pending(&cdns_uart->stop_tx_timer) && + cdns_uart->rs485_tx_started) { + mod_timer(&cdns_uart->stop_tx_timer, jiffies + + msecs_to_jiffies(cdns_uart->port->rs485.delay_rts_after_send)); + } else { + regval = readl(port->membase + CDNS_UART_CR); + regval |= CDNS_UART_CR_TX_DIS; + /* Disable the transmitter */ + writel(regval, port->membase + CDNS_UART_CR); + } } /** @@ -829,6 +971,12 @@ static int cdns_uart_startup(struct uart_port *port) (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST)) cpu_relax(); + if (cdns_uart->port->rs485.flags & SER_RS485_ENABLED) { + timer_setup(&cdns_uart->stop_tx_timer, + cdns_rs485_stop_tx_callback, 0); + cdns_rs485_rx_setup(cdns_uart); + } + /* * Clear the RX disable bit and then set the RX enable bit to enable * the receiver. @@ -888,6 +1036,7 @@ static void cdns_uart_shutdown(struct uart_port *port) { int status; unsigned long flags; + struct cdns_uart *cdns_uart = port->private_data; uart_port_lock_irqsave(port, &flags); @@ -903,6 +1052,11 @@ static void cdns_uart_shutdown(struct uart_port *port) uart_port_unlock_irqrestore(port, flags); free_irq(port->irq, port); + + if (cdns_uart->port->rs485.flags & SER_RS485_ENABLED) { + del_timer_sync(&cdns_uart->timer); + del_timer_sync(&cdns_uart->stop_tx_timer); + } } /** @@ -1032,7 +1186,7 @@ static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) mode_reg &= ~CDNS_UART_MR_CHMODE_MASK; if (mctrl & TIOCM_RTS) - val |= CDNS_UART_MODEMCR_RTS; + cdns_rts_gpio_enable(cdns_uart_data, 1); if (mctrl & TIOCM_DTR) val |= CDNS_UART_MODEMCR_DTR; if (mctrl & TIOCM_LOOP) @@ -1455,6 +1609,31 @@ MODULE_DEVICE_TABLE(of, cdns_uart_of_match); /* Temporary variable for storing number of instances */ static int instances; +/** + * cdns_rs485_config - Called when an application calls TIOCSRS485 ioctl. + * @port: Pointer to the uart_port structure + * @termios: Pointer to the ktermios structure + * @rs485: Pointer to the serial_rs485 structure + * + * Return: 0 + */ +static int cdns_rs485_config(struct uart_port *port, struct ktermios *termios, + struct serial_rs485 *rs485) +{ + u32 val; + + if (rs485->flags & SER_RS485_ENABLED) { + dev_dbg(port->dev, "Setting UART to RS485\n"); + /* Make sure auto RTS is disabled */ + val = readl(port->membase + CDNS_UART_MODEMCR); + val &= ~CDNS_UART_MODEMCR_FCM; + writel(val, port->membase + CDNS_UART_MODEMCR); + /* Disable transmitter and make Rx setup*/ + cdns_uart_stop_tx(port); + } + return 0; +} + /** * cdns_uart_probe - Platform driver probe * @pdev: Pointer to the platform device structure @@ -1597,9 +1776,23 @@ static int cdns_uart_probe(struct platform_device *pdev) port->private_data = cdns_uart_data; port->read_status_mask = CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_OVERRUN | CDNS_UART_IXR_TOUT; + port->rs485_config = cdns_rs485_config; + port->rs485_supported = cdns_rs485_supported; cdns_uart_data->port = port; platform_set_drvdata(pdev, port); + rc = uart_get_rs485_mode(port); + if (rc) + goto err_out_clk_notifier; + + cdns_uart_data->gpiod_rts = devm_gpiod_get_optional(&pdev->dev, "rts", + GPIOD_OUT_LOW); + if (IS_ERR(cdns_uart_data->gpiod_rts)) { + rc = PTR_ERR(cdns_uart_data->gpiod_rts); + dev_err(port->dev, "xuartps: devm_gpiod_get_optional failed\n"); + goto err_out_clk_notifier; + } + pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT); pm_runtime_set_active(&pdev->dev); @@ -1618,6 +1811,8 @@ static int cdns_uart_probe(struct platform_device *pdev) console_port = port; } #endif + if (cdns_uart_data->port->rs485.flags & SER_RS485_ENABLED) + cdns_rs485_rx_setup(cdns_uart_data); rc = uart_add_one_port(&cdns_uart_uart_driver, port); if (rc) { @@ -1646,6 +1841,7 @@ static int cdns_uart_probe(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); pm_runtime_dont_use_autosuspend(&pdev->dev); +err_out_clk_notifier: #ifdef CONFIG_COMMON_CLK clk_notifier_unregister(cdns_uart_data->uartclk, &cdns_uart_data->clk_rate_change_nb);