From patchwork Thu Feb 8 17:01:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Li X-Patchwork-Id: 771523 Received: from EUR03-VI1-obe.outbound.protection.outlook.com (mail-vi1eur03on2081.outbound.protection.outlook.com [40.107.103.81]) (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 6B0DB85C73; Thu, 8 Feb 2024 17:02:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.103.81 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707411726; cv=fail; b=sNqRlEAE3Z6kNgyrjSAdSvCN2Byr6hHN3/hhl0PaykMtv7fKDNfUSF+oixnPPndLJRc8pUuETOn4X2Nj/trBgFqOsDQb+ec4jtOqXCgM1ea+CCT7ePTwnO/v+EM7l9trcbamDYM7e1R5G4mYGWYYSOrg9CT07tT/cKxi7O1zzvo= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707411726; c=relaxed/simple; bh=cwbo1GKMkabi0KyHCZXugYVNbZjoWzK11emt0jqwWJ4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=siOdJuJxKDc+w1Ny1AMpH7GtUWfhd6Nj63izjWJl1b0FDtPzs+BQemn1ovjT/3tJCtjXuKwwrx1JVNULIc5WTCLqOWLSeV48eP5G4xl41RGi9sMopbQQg9Wixwk8dWj7cvulVZCGDZ7409ltXZ1qLa1aqkF400LLzRlyZeoRu28= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com; spf=pass smtp.mailfrom=nxp.com; dkim=pass (1024-bit key) header.d=nxp.com header.i=@nxp.com header.b=TAV1rP/G; arc=fail smtp.client-ip=40.107.103.81 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=nxp.com header.i=@nxp.com header.b="TAV1rP/G" ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=TDya8lvlR2nvh1VKRsQ+FkbVQtlp36b1flXBwifUMqh4neBzJ94NR5sSKKUt8ACz8Qvf96a4h/3klg7AcsNwd+Xq5rWhI5TswQ0/eRCoagbSTsvOKvAW4jjlWg/xCtLI3ellXJDbRFAikvqw0LzTx/duyLUn02kYu9Qfdx4WHV+ahcjzYux4D/2gHVxBl0gJxhvZoRGYcembkNu+nrfcxgpGPItxnMVoToSDRZIAV+I2a2qkJpGvLMCsebRY598gfB+uMdIPq5a5U6JnnAM8j3MWzML7Q6IqsIGAwDsW3vC3ig+ahc2nXATaKOtZBh+9wzpSfMxSZIa41pmxq7yBZQ== 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=04xqZBjF8Z1MoZTW2zREKB6wmaZdVutdhyYJgIV1Fgc=; b=KaxRbniqv6hsxpWxSWctRX2g4s2bJQsJFOacUcc1NtUFyANPNjAkFJ40oo2r8hJ7sw+6lxWFjC1pCngwvhIKEYDo6nDnkwp8zjz6IbrhjfADBy77YYG8hI4yIMw1yiIxl4wREV3PD5RfTcG/llUngPJ13unyB0lNOmasa8uD/yXEOkSK4hSUdFxQfql4/b2hOo6hRRzT+8YYUqIdCeIBkd/rjQgxFsu2dbBQrA7Hk+KztxizvHxZfEw0kbUI7vSc0a9U0hYasqH62sh23m/oFQU7SXecS1EoJlxdjK1vEwd+GwpXiLYagBErZ5d8AuTkQ2C0andlVne4meJkGuVOPA== 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=04xqZBjF8Z1MoZTW2zREKB6wmaZdVutdhyYJgIV1Fgc=; b=TAV1rP/GtcUeFdu4jayNsgMNGk9OWumBar+oIRNEB7Y8MB/YpRmYiOrYfREY7WspnjK/4goAxY4+3450GdrQEX5dtD9mMSS3l562Bwqxw+JXm+2iW3bFn8iAj3og7/uJSHjf8NEpmCoTaDuA6E+KbrBnBt4d0LLQQ/WL1+4e+eQ= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Received: from PAXPR04MB9642.eurprd04.prod.outlook.com (2603:10a6:102:240::14) by PA4PR04MB9248.eurprd04.prod.outlook.com (2603:10a6:102:2a3::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7249.36; Thu, 8 Feb 2024 17:02:02 +0000 Received: from PAXPR04MB9642.eurprd04.prod.outlook.com ([fe80::c8b4:5648:8948:e85c]) by PAXPR04MB9642.eurprd04.prod.outlook.com ([fe80::c8b4:5648:8948:e85c%3]) with mapi id 15.20.7249.035; Thu, 8 Feb 2024 17:02:02 +0000 From: Frank Li To: frank.li@nxp.com Cc: alexandre.belloni@bootlin.com, conor.culhane@silvaco.com, devicetree@vger.kernel.org, gregkh@linuxfoundation.org, ilpo.jarvinen@linux.intel.com, imx@lists.linux.dev, jirislaby@kernel.org, joe@perches.com, krzysztof.kozlowski+dt@linaro.org, krzysztof.kozlowski@linaro.org, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, miquel.raynal@bootlin.com, robh@kernel.org, zbigniew.lukwinski@linux.intel.com Subject: [PATCH v8 6/8] i3c: target: func: add tty driver Date: Thu, 8 Feb 2024 12:01:15 -0500 Message-Id: <20240208170117.798357-7-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240208170117.798357-1-Frank.Li@nxp.com> References: <20240208170117.798357-1-Frank.Li@nxp.com> X-ClientProxiedBy: SJ0PR03CA0245.namprd03.prod.outlook.com (2603:10b6:a03:3a0::10) To PAXPR04MB9642.eurprd04.prod.outlook.com (2603:10a6:102:240::14) Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB9642:EE_|PA4PR04MB9248:EE_ X-MS-Office365-Filtering-Correlation-Id: f1103997-bb95-4dfc-3834-08dc28c7ab51 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:PAXPR04MB9642.eurprd04.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230031)(39860400002)(346002)(396003)(366004)(376002)(136003)(230922051799003)(186009)(64100799003)(1800799012)(451199024)(38100700002)(6666004)(52116002)(6506007)(83380400001)(37006003)(86362001)(7416002)(41300700001)(1076003)(2616005)(26005)(34206002)(6512007)(36756003)(8676002)(8936002)(4326008)(6486002)(478600001)(2906002)(30864003)(5660300002)(66476007)(66946007)(316002)(66556008)(38350700005); 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: f1103997-bb95-4dfc-3834-08dc28c7ab51 X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB9642.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Feb 2024 17:02:01.9296 (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: 2wchm8ERBtZuq9Gmj+cpj52dW7E3E5YGXOGRFcICHEwSO5q/vXA9UDL01j1FvU8SUxtzhUYSRpMq0STLOHgnsg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA4PR04MB9248 Add tty over I3C target function driver. Signed-off-by: Frank Li --- Notes: Change from v7 to v8 - reorder header file - add missed header files Change from v5 to v7 - none Change from v4 to v5 - remove void* - include bitfield.h - remove extra () - oneline for struct ttyi3c_port *sport drivers/i3c/Kconfig | 3 + drivers/i3c/Makefile | 1 + drivers/i3c/func/Kconfig | 9 + drivers/i3c/func/Makefile | 3 + drivers/i3c/func/tty.c | 481 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 497 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 d59a7eb83d13a..fca808cda87b3 100644 --- a/drivers/i3c/Kconfig +++ b/drivers/i3c/Kconfig @@ -48,3 +48,6 @@ config I3C_TARGET_CONFIGFS the target function and used to bind the function with a target controller. +if I3C_TARGET +source "drivers/i3c/func/Kconfig" +endif # I3C_TARGET diff --git a/drivers/i3c/Makefile b/drivers/i3c/Makefile index c275aeae8970c..11f026d6876fe 100644 --- a/drivers/i3c/Makefile +++ b/drivers/i3c/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_I3C) += i3c.o obj-$(CONFIG_I3C_TARGET) += target.o obj-$(CONFIG_I3C_TARGET_CONFIGFS) += i3c-cfs.o obj-$(CONFIG_I3C) += master/ +obj-$(CONFIG_I3C_TARGET) += func/ diff --git a/drivers/i3c/func/Kconfig b/drivers/i3c/func/Kconfig new file mode 100644 index 0000000000000..7115129eb7d5a --- /dev/null +++ b/drivers/i3c/func/Kconfig @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 + +config I3C_TARGET_FUNC_TTY + tristate "I3C target tty driver" + depends on I3C_TARGET + help + I3C Target TTY Function Driver. + + General TTY over I3C target controller function drivers. diff --git a/drivers/i3c/func/Makefile b/drivers/i3c/func/Makefile new file mode 100644 index 0000000000000..16b3b9301496b --- /dev/null +++ b/drivers/i3c/func/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(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..2cf25c8d49f2b --- /dev/null +++ b/drivers/i3c/func/tty.c @@ -0,0 +1,481 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2023 NXP + * Author: Frank Li + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#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 = 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, "failed to 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"); +