From patchwork Wed Jan 10 17:52:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 186978 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:2411:b0:101:2151:f287 with SMTP id m17csp955851dyi; Wed, 10 Jan 2024 09:58:54 -0800 (PST) X-Google-Smtp-Source: AGHT+IEOJ9LH2wOgiKbRTvOt75mFVAe9ovIrcxm/A0SVYBv+Cnq+T+hpACTGoh3Aiu1rP1zCocv9 X-Received: by 2002:a17:902:9690:b0:1d4:c27d:8428 with SMTP id n16-20020a170902969000b001d4c27d8428mr1037311plp.60.1704909534140; Wed, 10 Jan 2024 09:58:54 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1704909534; cv=pass; d=google.com; s=arc-20160816; b=I/7a48SfNpkol64zNhY77MrzCh4Iq/FBti25/gZOKynDGY6E30oV7DwnkPlJBN1gHi t7HB8ctg3oVkVLRnL5quWr83mmkUrzQiBU4/00nkSvG/BU+AXWHh23JuhhoE3tGGMFbz 8vdP81WCpLsx1iUfBWgmUUu2N/VHyIm2hcyjhftCCjCmJHE+MX5Gbu+jG6z7pH1+PyJB 0hMmJxWy4FIo8w25OYJxCpawxEQQnPhPChb0nxXmD4NWcTQu6zRFG83mRKcTj7rtzu4E GjyoO4X2ZijNFlDteL8SiVuyd8AS8X7pii9azxJsk4sorscUBUAHOwXUNNEPjtiZZ2Iw X1hw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:list-unsubscribe:list-subscribe:list-id:precedence :content-transfer-encoding:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature; bh=/9ibCah//y7mPmevD/ktMv3Kp/63ZSS5kxU8AH8LwAM=; fh=PTWCgKFpWkHSWDb5OB7dY1CHILd7kMZvHvPDuwGEgOI=; b=Jv0kvd9c9A87sX/6z7AFwd9JZLiVUkHMc4H9z74ZWTkaa+X+S9CUwUH3i7ajytMYcB 0kxDfHYVSWlNZ1Grap8O5xo8usZ++ntcswPwf6IihJ26gyleOTfeeYqULKdISK0/8V43 1hGSbLDOVTUvKy54e9ds3U/hpOMyggOnNqYwNBgrrFLP72aidUR+VYg6/BtifGROXqIy OHgGJGaZxsQ9qIP4Y88MmAQY9MHSvwqI3Wh5ZsHksiRCEqFbCBtVALgb77ortuElBZLT nM1OEUekp0HF6OBdGjgARQB4B4P4ZtwQ2w9sm+k65D3OTHgmnLFlEvB7hUnHTOt6HXzf wYgg== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@nxp.com header.s=selector2 header.b=KGK0TBFz; arc=pass (i=1 spf=pass spfdomain=nxp.com dkim=pass dkdomain=nxp.com dmarc=pass fromdomain=nxp.com); spf=pass (google.com: domain of linux-kernel+bounces-22570-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) smtp.mailfrom="linux-kernel+bounces-22570-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nxp.com Received: from sy.mirrors.kernel.org (sy.mirrors.kernel.org. [147.75.48.161]) by mx.google.com with ESMTPS id l6-20020a170902ec0600b001d510c1285bsi3987680pld.325.2024.01.10.09.58.53 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Jan 2024 09:58:54 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-22570-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) client-ip=147.75.48.161; Authentication-Results: mx.google.com; dkim=pass header.i=@nxp.com header.s=selector2 header.b=KGK0TBFz; arc=pass (i=1 spf=pass spfdomain=nxp.com dkim=pass dkdomain=nxp.com dmarc=pass fromdomain=nxp.com); spf=pass (google.com: domain of linux-kernel+bounces-22570-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) smtp.mailfrom="linux-kernel+bounces-22570-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nxp.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sy.mirrors.kernel.org (Postfix) with ESMTPS id 630C4B24D19 for ; Wed, 10 Jan 2024 17:54:48 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3BEA04D58E; Wed, 10 Jan 2024 17:53:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=nxp.com header.i=@nxp.com header.b="KGK0TBFz" Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05on2069.outbound.protection.outlook.com [40.107.20.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0EF704E1CB; Wed, 10 Jan 2024 17:53:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nxp.com ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=EGutTUreXUfr1nBGohjGmOTb7k7PIH0jt+4xdDwCGg42hBYh3iob16fB33EIZ9IDGhBHNjTEcHKUaW0c4EK1XdCsJSH7OHfvaegF1Hzy0KjTO7IG0caEIzqkad+qM1C0MEy5oAGaxGYJRWrIC0EcC9doIJnFAr8eWyRzhzrBT2L31yldwRnehnBUEDFoW5nHpRjMOvK0LN8NlLyGLKaCa0s+tn3Was31KL3WwGT0Gpi0ebxQ7WwqYRTRLUVXi7reOdd9z/rRIUjDG5GQML5/nl3bLS+B3YQu0FAB6QAYU29Fbzt9XQwWwFxyTslDW/zQiyQDT5uBFXgnGmRnXoPhEA== 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=/9ibCah//y7mPmevD/ktMv3Kp/63ZSS5kxU8AH8LwAM=; b=aAF/Tf+ltyug0LVNTL58TdCyoPBigdRqmLGF9+X6XQL40j7V2/XlxZrFCtVVC3lxz0kGn9fk20HwrA4wKIF17eoKeA7N8FmQgX2hpDKQ9zN/i3F8ZtUldrC5z0qmMinJ106N3mbODVUhcbkFBfq8+GeLqtd2F30LTzp1N7wscDiwkJKxaalanl68e6pvsCupBoe3UiMG6p5uCpZPxACPIXbMGG2HPfI43huV1okMG/uv/5wEcHdJgFVtwMWHzhctqkYiOAw1KvqdTJcyiJhx3Y6vkYz1931+siIRfI2Kcs7szu+qVjtqd8yrgaSv02Yb5WaQ6z4xnBoY5WspW0SYSw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nxp.com; dmarc=pass action=none header.from=nxp.com; dkim=pass header.d=nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=/9ibCah//y7mPmevD/ktMv3Kp/63ZSS5kxU8AH8LwAM=; b=KGK0TBFzXAVC9xLmPJlE5qBEP4fUJcNkJe3zK1T/24MKDJR2rzRQkPRrUsnKnZXO6nMODCkSlg3f26TMjj7fapA0G71kdSzqMtCYM0Af3cThWSba09bHswmTVQMw/h90Ex2I6QtxJ0b+CfSK19cftDXRyUQuXa7lL7W1oFNVhrI= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Received: from AS8PR04MB7511.eurprd04.prod.outlook.com (2603:10a6:20b:23f::5) by DB9PR04MB9332.eurprd04.prod.outlook.com (2603:10a6:10:36c::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7181.17; Wed, 10 Jan 2024 17:53:00 +0000 Received: from AS8PR04MB7511.eurprd04.prod.outlook.com ([fe80::8ee3:bac5:a2da:d469]) by AS8PR04MB7511.eurprd04.prod.outlook.com ([fe80::8ee3:bac5:a2da:d469%4]) with mapi id 15.20.7159.020; Wed, 10 Jan 2024 17:53:00 +0000 From: Frank Li To: frank.li@nxp.com, robh@kernel.org Cc: alexandre.belloni@bootlin.com, conor.culhane@silvaco.com, gregkh@linuxfoundation.org, imx@lists.linux.dev, jirislaby@kernel.org, joe@perches.com, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, miquel.raynal@bootlin.com, zbigniew.lukwinski@linux.intel.com, devicetree@vger.kernel.org, krzysztof.kozlowski+dt@linaro.org, krzysztof.kozlowski@linaro.org Subject: [PATCH v2 5/7] i3c: target: func: add tty driver Date: Wed, 10 Jan 2024 12:52:19 -0500 Message-Id: <20240110175221.2335480-6-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240110175221.2335480-1-Frank.Li@nxp.com> References: <20240110175221.2335480-1-Frank.Li@nxp.com> X-ClientProxiedBy: SJ0PR05CA0145.namprd05.prod.outlook.com (2603:10b6:a03:33d::30) To AS8PR04MB7511.eurprd04.prod.outlook.com (2603:10a6:20b:23f::5) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR04MB7511:EE_|DB9PR04MB9332:EE_ X-MS-Office365-Filtering-Correlation-Id: 503505dd-dbb6-4b4d-7d39-08dc1204fc87 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AS8PR04MB7511.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(39860400002)(366004)(346002)(396003)(136003)(376002)(230922051799003)(64100799003)(186009)(451199024)(1800799012)(6486002)(8676002)(8936002)(86362001)(5660300002)(4326008)(66556008)(30864003)(66476007)(316002)(66946007)(7416002)(38350700005)(36756003)(2906002)(41300700001)(38100700002)(6512007)(52116002)(6666004)(83380400001)(6506007)(1076003)(26005)(2616005)(478600001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 503505dd-dbb6-4b4d-7d39-08dc1204fc87 X-MS-Exchange-CrossTenant-AuthSource: AS8PR04MB7511.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2024 17:53:00.7510 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Rk9hhklvHRE6wVzpuBm29SvI3MF2+TmJHWEPwcVIlW2Ah4KhOZjEst/xOjDfDFGB1BLUqxU53LVKvUWXHAAB/g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR04MB9332 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1787727219262220577 X-GMAIL-MSGID: 1787727219262220577 Add tty over I3C target function driver. Signed-off-by: Frank Li --- drivers/i3c/Kconfig | 1 + drivers/i3c/Makefile | 1 + drivers/i3c/func/Kconfig | 9 + drivers/i3c/func/Makefile | 3 + drivers/i3c/func/tty.c | 475 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 489 insertions(+) create mode 100644 drivers/i3c/func/Kconfig create mode 100644 drivers/i3c/func/Makefile create mode 100644 drivers/i3c/func/tty.c diff --git a/drivers/i3c/Kconfig b/drivers/i3c/Kconfig index 08ceef313f831..e524a8777e182 100644 --- a/drivers/i3c/Kconfig +++ b/drivers/i3c/Kconfig @@ -50,4 +50,5 @@ config I3C_TARGET_CONFIGFS if I3C_TARGET source "drivers/i3c/target/Kconfig" +source "drivers/i3c/func/Kconfig" endif # I3C_TARGET diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile index c36455cb852ea..1f7e5fa9d25c2 100644 --- a/drivers/i3c/Makefile +++ b/drivers/i3c/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_I3C) += master/ obj-$(CONFIG_I3C_TARGET) += target.o obj-$(CONFIG_I3C_TARGET_CONFIGFS) += i3c-cfs.o obj-$(CONFIG_I3C_TARGET) += target/ +obj-$(CONFIG_I3C_TARGET) += func/ diff --git a/drivers/i3c/func/Kconfig b/drivers/i3c/func/Kconfig new file mode 100644 index 0000000000000..6302061e02279 --- /dev/null +++ b/drivers/i3c/func/Kconfig @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 + +config I3C_TARGET_FUNC_TTY + tristate "PCI Endpoint Test driver" + depends on I3C_TARGET + help + I3C Target TTY Function Driver. + + General TTY over I3C target controller function drivers. diff --git a/drivers/i3c/func/Makefile b/drivers/i3c/func/Makefile new file mode 100644 index 0000000000000..16b3b9301496b --- /dev/null +++ b/drivers/i3c/func/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_I3C_TARGET_FUNC_TTY) += tty.o diff --git a/drivers/i3c/func/tty.c b/drivers/i3c/func/tty.c new file mode 100644 index 0000000000000..bad99c08be0ac --- /dev/null +++ b/drivers/i3c/func/tty.c @@ -0,0 +1,475 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2023 NXP + * Author: Frank Li + */ + +#include +#include +#include +#include +#include + +static DEFINE_IDR(i3c_tty_minors); + +static struct tty_driver *i3c_tty_driver; + +#define I3C_TTY_MINORS 8 + +#define I3C_TX_NOEMPTY BIT(0) +#define I3C_TTY_TRANS_SIZE 16 +#define I3C_TTY_IBI_TX BIT(0) + +struct ttyi3c_port { + struct tty_port port; + int minor; + struct i3c_target_func *i3cdev; + struct completion txcomplete; + spinlock_t xlock; + void *buffer; + struct work_struct work; + u16 status; + struct i3c_request *req; +}; + +static void i3c_target_tty_rx_complete(struct i3c_request *req) +{ + struct ttyi3c_port *port = req->context; + + if (req->status == I3C_REQUEST_CANCEL) { + i3c_target_ctrl_free_request(req); + return; + } + + tty_insert_flip_string(&port->port, req->buf, req->actual); + tty_flip_buffer_push(&port->port); + + req->actual = 0; + req->status = 0; + i3c_target_ctrl_queue(req, GFP_KERNEL); +} + +static void i3c_target_tty_tx_complete(struct i3c_request *req) +{ + struct ttyi3c_port *sport = req->context; + unsigned long flags; + + if (req->status == I3C_REQUEST_CANCEL) { + i3c_target_ctrl_free_request(req); + return; + } + + spin_lock_irqsave(&sport->xlock, flags); + kfifo_dma_out_finish(&sport->port.xmit_fifo, req->actual); + sport->req = NULL; + + if (kfifo_is_empty(&sport->port.xmit_fifo)) + complete(&sport->txcomplete); + else + queue_work(system_unbound_wq, &sport->work); + + if (kfifo_len(&sport->port.xmit_fifo) < WAKEUP_CHARS) + tty_port_tty_wakeup(&sport->port); + spin_unlock_irqrestore(&sport->xlock, flags); + + i3c_target_ctrl_free_request(req); +} + +static void i3c_target_tty_i3c_work(struct work_struct *work) +{ + struct ttyi3c_port *sport = container_of(work, struct ttyi3c_port, work); + struct i3c_request *req = sport->req; + struct scatterlist sg[1]; + unsigned int nents; + u8 ibi; + + if (kfifo_is_empty(&sport->port.xmit_fifo)) + return; + + if (!req) { + req = i3c_target_ctrl_alloc_request(sport->i3cdev->ctrl, GFP_KERNEL); + if (!req) + return; + + sg_init_table(sg, ARRAY_SIZE(sg)); + nents = kfifo_dma_out_prepare(&sport->port.xmit_fifo, sg, ARRAY_SIZE(sg), + UART_XMIT_SIZE); + if (!nents) + goto err; + + req->length = sg->length; + req->buf = sg_virt(sg); + + req->complete = i3c_target_tty_tx_complete; + req->context = sport; + req->tx = true; + + if (i3c_target_ctrl_queue(req, GFP_KERNEL)) + goto err; + + sport->req = req; + } + + ibi = I3C_TTY_IBI_TX; + i3c_target_ctrl_raise_ibi(sport->i3cdev->ctrl, &ibi, 1); + + return; + +err: + i3c_target_ctrl_free_request(req); +} + +static int i3c_port_activate(struct tty_port *port, struct tty_struct *tty) +{ + struct ttyi3c_port *sport = container_of(port, struct ttyi3c_port, port); + const struct i3c_target_ctrl_features *feature; + struct i3c_target_func *func = sport->i3cdev; + struct i3c_request *req; + int rxfifo_size; + int offset = 0; + int ret; + + feature = i3c_target_ctrl_get_features(func->ctrl); + if (!feature) + return -EINVAL; + + ret = tty_port_alloc_xmit_buf(port); + if (ret) + return ret; + + sport->buffer = (void *)get_zeroed_page(GFP_KERNEL); + if (!sport->buffer) + goto err_alloc_rx_buf; + + rxfifo_size = feature->rx_fifo_sz; + + if (!rxfifo_size) + rxfifo_size = I3C_TTY_TRANS_SIZE; + + do { + req = i3c_target_ctrl_alloc_request(func->ctrl, GFP_KERNEL); + if (!req) + goto err_alloc_req; + + req->buf = (void *) (sport->buffer + offset); + req->length = rxfifo_size; + req->context = sport; + req->complete = i3c_target_tty_rx_complete; + offset += rxfifo_size; + + if (i3c_target_ctrl_queue(req, GFP_KERNEL)) + goto err_alloc_req; + } while (req && (offset + rxfifo_size) < UART_XMIT_SIZE); + + reinit_completion(&sport->txcomplete); + + return 0; + +err_alloc_req: + i3c_target_ctrl_cancel_all_reqs(func->ctrl, false); + free_page((unsigned long)sport->buffer); +err_alloc_rx_buf: + tty_port_free_xmit_buf(port); + return -ENOMEM; +} + +static void i3c_port_shutdown(struct tty_port *port) +{ + struct ttyi3c_port *sport = + container_of(port, struct ttyi3c_port, port); + + cancel_work_sync(&sport->work); + + i3c_target_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, true); + i3c_target_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, false); + + i3c_target_ctrl_fifo_flush(sport->i3cdev->ctrl, true); + i3c_target_ctrl_fifo_flush(sport->i3cdev->ctrl, false); + + tty_port_free_xmit_buf(port); + free_page((unsigned long)sport->buffer); +} + +static void i3c_port_destruct(struct tty_port *port) +{ + struct ttyi3c_port *sport = + container_of(port, struct ttyi3c_port, port); + + idr_remove(&i3c_tty_minors, sport->minor); +} + +static const struct tty_port_operations i3c_port_ops = { + .shutdown = i3c_port_shutdown, + .activate = i3c_port_activate, + .destruct = i3c_port_destruct, +}; + +static int i3c_target_tty_bind(struct i3c_target_func *func) +{ + struct ttyi3c_port *sport; + struct device *tty_dev; + int minor; + int ret; + + sport = dev_get_drvdata(&func->dev); + + if (i3c_target_ctrl_set_config(func->ctrl, func)) { + dev_err(&func->dev, "failure set i3c config\n"); + return -EINVAL; + } + + spin_lock_init(&sport->xlock); + init_completion(&sport->txcomplete); + + ret = minor = idr_alloc(&i3c_tty_minors, sport, 0, I3C_TTY_MINORS, GFP_KERNEL); + + if (minor < 0) + goto err_idr_alloc; + + tty_port_init(&sport->port); + sport->port.ops = &i3c_port_ops; + + tty_dev = tty_port_register_device(&sport->port, i3c_tty_driver, minor, + &func->dev); + if (IS_ERR(tty_dev)) { + ret = PTR_ERR(tty_dev); + goto err_register_port; + } + + sport->minor = minor; + ret = i3c_target_ctrl_enable(func->ctrl); + if (ret) + goto err_ctrl_enable; + + return 0; + +err_ctrl_enable: + tty_port_unregister_device(&sport->port, i3c_tty_driver, sport->minor); +err_register_port: + idr_remove(&i3c_tty_minors, sport->minor); +err_idr_alloc: + i3c_target_ctrl_cancel_all_reqs(func->ctrl, false); + dev_err(&func->dev, "bind failure\n"); + + return ret; +} + +static void i3c_target_tty_unbind(struct i3c_target_func *func) +{ + struct ttyi3c_port *sport; + + sport = dev_get_drvdata(&func->dev); + + cancel_work_sync(&sport->work); + + i3c_target_ctrl_disable(func->ctrl); + i3c_target_ctrl_cancel_all_reqs(func->ctrl, 0); + i3c_target_ctrl_cancel_all_reqs(func->ctrl, 1); + + tty_port_unregister_device(&sport->port, i3c_tty_driver, sport->minor); + + free_page((unsigned long)sport->buffer); +} + +static struct i3c_target_func_ops i3c_func_ops = { + .bind = i3c_target_tty_bind, + .unbind = i3c_target_tty_unbind, +}; + +static int i3c_tty_probe(struct i3c_target_func *func) +{ + struct device *dev = &func->dev; + struct ttyi3c_port *port; + + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + port->i3cdev = func; + dev_set_drvdata(&func->dev, port); + + INIT_WORK(&port->work, i3c_target_tty_i3c_work); + + return 0; +} + +static ssize_t i3c_write(struct tty_struct *tty, const unsigned char *buf, size_t count) +{ + struct ttyi3c_port *sport = tty->driver_data; + unsigned long flags; + bool is_empty; + int ret = 0; + + spin_lock_irqsave(&sport->xlock, flags); + ret = kfifo_in(&sport->port.xmit_fifo, buf, count); + is_empty = kfifo_is_empty(&sport->port.xmit_fifo); + i3c_target_ctrl_set_status_format1(sport->i3cdev->ctrl, sport->status | I3C_TX_NOEMPTY); + spin_unlock_irqrestore(&sport->xlock, flags); + + if (!is_empty) + queue_work(system_unbound_wq, &sport->work); + + return ret; +} + +static int i3c_put_char(struct tty_struct *tty, unsigned char ch) +{ + struct ttyi3c_port *sport = tty->driver_data; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&sport->xlock, flags); + ret = kfifo_put(&sport->port.xmit_fifo, ch); + spin_unlock_irqrestore(&sport->xlock, flags); + + return ret; +} + +static void i3c_flush_chars(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + unsigned long flags; + + spin_lock_irqsave(&sport->xlock, flags); + if (!kfifo_is_empty(&sport->port.xmit_fifo)) + queue_work(system_unbound_wq, &sport->work); + spin_unlock_irqrestore(&sport->xlock, flags); +} + +static unsigned int i3c_write_room(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + + return kfifo_avail(&sport->port.xmit_fifo); +} + +static void i3c_throttle(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + + i3c_target_ctrl_cancel_all_reqs(sport->i3cdev->ctrl, false); +} + +static void i3c_unthrottle(struct tty_struct *tty) +{ + struct ttyi3c_port *sport = tty->driver_data; + + i3c_port_activate(&sport->port, tty); +} + +static int i3c_open(struct tty_struct *tty, struct file *filp) +{ + struct ttyi3c_port *sport = container_of(tty->port, struct ttyi3c_port, port); + int ret; + + tty->driver_data = sport; + + if (!i3c_target_ctrl_get_addr(sport->i3cdev->ctrl)) { + dev_dbg(&sport->i3cdev->dev, "No target addr assigned, try hotjoin"); + ret = i3c_target_ctrl_hotjoin(sport->i3cdev->ctrl); + if (ret) { + dev_err(&sport->i3cdev->dev, "Hotjoin failure, check connection"); + return ret; + } + } + + return tty_port_open(&sport->port, tty, filp); +} + +static void i3c_close(struct tty_struct *tty, struct file *filp) +{ + tty_port_close(tty->port, tty, filp); +} + +static void i3c_wait_until_sent(struct tty_struct *tty, int timeout) +{ + struct ttyi3c_port *sport = tty->driver_data; + int val; + int ret; + u8 ibi = I3C_TTY_IBI_TX; + int retry = 100; + + if (!kfifo_is_empty(&sport->port.xmit_fifo)) { + do { + ret = wait_for_completion_timeout(&sport->txcomplete, timeout / 100); + if (ret) + break; + i3c_target_ctrl_raise_ibi(sport->i3cdev->ctrl, &ibi, 1); + } while (retry--); + + reinit_completion(&sport->txcomplete); + } + + read_poll_timeout(i3c_target_ctrl_fifo_status, val, !val, 100, timeout, false, + sport->i3cdev->ctrl, true); + + i3c_target_ctrl_set_status_format1(sport->i3cdev->ctrl, sport->status & (~I3C_TX_NOEMPTY)); +} + +static const struct tty_operations i3c_tty_ops = { + .open = i3c_open, + .close = i3c_close, + .write = i3c_write, + .put_char = i3c_put_char, + .flush_chars = i3c_flush_chars, + .write_room = i3c_write_room, + .throttle = i3c_throttle, + .unthrottle = i3c_unthrottle, + .wait_until_sent = i3c_wait_until_sent, +}; + +DECLARE_I3C_TARGET_FUNC(tty, i3c_tty_probe, NULL, &i3c_func_ops); + +static int __init i3c_tty_init(void) +{ + int ret; + + i3c_tty_driver = tty_alloc_driver( + I3C_TTY_MINORS, TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV); + + if (IS_ERR(i3c_tty_driver)) + return PTR_ERR(i3c_tty_driver); + + i3c_tty_driver->driver_name = "ttySI3C", i3c_tty_driver->name = "ttySI3C", + i3c_tty_driver->minor_start = 0, + i3c_tty_driver->type = TTY_DRIVER_TYPE_SERIAL, + i3c_tty_driver->subtype = SERIAL_TYPE_NORMAL, + i3c_tty_driver->init_termios = tty_std_termios; + i3c_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | + CLOCAL; + i3c_tty_driver->init_termios.c_lflag = 0; + + tty_set_operations(i3c_tty_driver, &i3c_tty_ops); + + ret = tty_register_driver(i3c_tty_driver); + if (ret) + goto err_register_tty_driver; + + ret = i3c_target_func_register_driver(&ttyi3c_func); + if (ret) + goto err_register_i3c_driver; + + return 0; + +err_register_i3c_driver: + tty_unregister_driver(i3c_tty_driver); + +err_register_tty_driver: + tty_driver_kref_put(i3c_tty_driver); + + return ret; +} + +static void __exit i3c_tty_exit(void) +{ + i3c_target_func_unregister_driver(&ttyi3c_func); + tty_unregister_driver(i3c_tty_driver); + tty_driver_kref_put(i3c_tty_driver); + idr_destroy(&i3c_tty_minors); +} + +module_init(i3c_tty_init); +module_exit(i3c_tty_exit); + +MODULE_LICENSE("GPL"); +