serial: 8250_it8768e: Create iTE IT8768E specific 8250 driver

Message ID	41B1320691916DE6+20250109120808.559950-1-wangyuli@uniontech.com
State	New
Headers	show Received: from smtpbgbr1.qq.com (smtpbgbr1.qq.com [54.207.19.206]) (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 239C5216E12 for <linux-serial@vger.kernel.org>; Thu, 9 Jan 2025 12:09:20 +0000 (UTC) From: WangYuli <wangyuli@uniontech.com> To: gregkh@linuxfoundation.org, jirislaby@kernel.org, wangyuli@uniontech.com Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, andriy.shevchenko@linux.intel.com, arnd@kernel.org, schnelle@linux.ibm.com, pnewman@connecttech.com, sunilvl@ventanamicro.com, paulmck@kernel.org, arnd@arndb.de, zhanjun@uniontech.com, guanwentao@uniontech.com, Zhuozhen He <hezhuozhen@uniontech.com>, Guowei Chen <chenguowei@uniontech.com> Subject: [PATCH] serial: 8250_it8768e: Create iTE IT8768E specific 8250 driver Date: Thu, 9 Jan 2025 20:08:08 +0800 Message-ID: <41B1320691916DE6+20250109120808.559950-1-wangyuli@uniontech.com> Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Feedback-ID: bizesmtpip:uniontech.com:qybglogicsvrgz:qybglogicsvrgz8a-1
Series	serial: 8250_it8768e: Create iTE IT8768E specific 8250 driver \| expand serial: 8250_it8768e: Create iTE IT8768E specific 8250 driver

diff --git a/drivers/tty/serial/8250/8250_it8768e.c b/drivers/tty/serial/8250/8250_it8768e.c new file mode 100644 index 000000000000..c2c0aeed3918 --- /dev/null +++ b/drivers/tty/serial/8250/8250_it8768e.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Probe for 8250/16550-type iTE IT8768E serial ports. + * + * Based on drivers/char/serial.c which is in the history, by Linus Torvalds, Theodore Ts'o. + * + * Copyright (C) 2025 Uniontech Ltd. + * Author: WangYuli <wangyuli@uniontech.com> + */ +#include <linux/bitops.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/pnp.h> +#include <linux/serial_core.h> +#include <linux/string.h> + +#include <asm/byteorder.h> + +#include "8250.h" + +struct it8768e_data { + struct uart_8250_port uart; + int line; +}; + +static int it8768e_probe(struct platform_device *pdev) +{ + struct it8768e_data *data; + struct resource *res; + void *__iomem sio_base; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "memory resource not found\n"); + return -EINVAL; + } + + sio_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (!sio_base) { + dev_err(&pdev->dev, "devm_ioremap error\n"); + return -ENOMEM; + } + + data = devm_kcalloc(&pdev->dev, 1, + sizeof(struct it8768e_data), + GFP_KERNEL); + if (!data) { + dev_err(&pdev->dev, "Failed to alloc private mem struct.\n"); + return -ENOMEM; + } + + spin_lock_init(&data->uart.port.lock); + data->uart.port.dev = &pdev->dev; + data->uart.port.regshift = 0; + data->uart.port.iotype = UPIO_MEM; + data->uart.port.type = PORT_16550A; + data->uart.port.membase = sio_base; + data->uart.port.mapbase = res->start; + data->uart.port.uartclk = 1843200; + data->uart.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SKIP_TEST; + + data->line = serial8250_register_8250_port(&data->uart); + if (data->line < 0) { + dev_err(&pdev->dev, + "unable to resigter 8250 port (MEM%llx): %d\n", + (unsigned long long)res->start, 0); + return data->line; + } + + dev_set_drvdata(&pdev->dev, data); + return 0; +} + +static void it8768e_remove(struct platform_device *pdev) +{ + struct it8768e_data *data = dev_get_drvdata(&pdev->dev); + + if (!data) + return; + + del_timer(&data->uart.timer); + serial8250_unregister_port(data->line); +} + +#ifdef CONFIG_PM +static int it8768e_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct it8768e_data *data = dev_get_drvdata(&pdev->dev); + + if (!data) + return -ENODEV; + + serial8250_suspend_port(data->line); + return 0; +} + +static int it8768e_resume(struct platform_device *pdev) +{ + struct it8768e_data *data = dev_get_drvdata(&pdev->dev); + + if (!data) + return -ENODEV; + + serial8250_resume_port(data->line); + + return 0; +} +#else +#define it8768e_suspend NULL +#define it8768e_resume NULL +#endif /* PM */ + +#ifdef CONFIG_ACPI +static const struct acpi_device_id it8768e_acpi_ids[] = { + { .id = "ITES0001" }, + {} +}; +MODULE_DEVICE_TABLE(acpi, it8768e_acpi_ids); +#else +#define it8768e_acpi_ids NULL +#endif /* ACPI */ + +static struct platform_driver it8768e_driver = { + .probe = it8768e_probe, + .remove = it8768e_remove, + .suspend = it8768e_suspend, + .resume = it8768e_resume, + .driver = { + .name = "it8768e", + .acpi_match_table = it8768e_acpi_ids, + }, +}; +module_platform_driver(it8768e_driver); + +MODULE_AUTHOR("WangYuli"); +MODULE_DESCRIPTION("8250 uart driver for iTE IT8768E"); +MODULE_LICENSE("GPL"); diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig index 55d26d16df9b..72e7f33d61d6 100644 --- a/drivers/tty/serial/8250/Kconfig +++ b/drivers/tty/serial/8250/Kconfig @@ -569,6 +569,12 @@ config SERIAL_8250_BCM7271 including DMA support and high accuracy BAUD rates, say Y to this option. If unsure, say N. +config SERIAL_8250_IT8768E + tristate "8250 support for iTE IT8768E uart" + depends on SERIAL_8250 + help + This option is used for iTE IT8768E serial ports. + config SERIAL_OF_PLATFORM tristate "Devicetree based probing for 8250 ports" depends on SERIAL_8250 && OF diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile index 1516de629b61..97bbf05a49bd 100644 --- a/drivers/tty/serial/8250/Makefile +++ b/drivers/tty/serial/8250/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_SERIAL_8250_HP300) += 8250_hp300.o obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o obj-$(CONFIG_SERIAL_8250_INGENIC) += 8250_ingenic.o obj-$(CONFIG_SERIAL_8250_IOC3) += 8250_ioc3.o +obj-$(CONFIG_SERIAL_8250_IT8768E) += 8250_it8768e.o obj-$(CONFIG_SERIAL_8250_LPC18XX) += 8250_lpc18xx.o obj-$(CONFIG_SERIAL_8250_LPSS) += 8250_lpss.o obj-$(CONFIG_SERIAL_8250_MEN_MCB) += 8250_men_mcb.o

serial: 8250_it8768e: Create iTE IT8768E specific 8250 driver

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