99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* SGI IOC3 8250 UART driver
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*
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* Copyright (C) 2019 Thomas Bogendoerfer <tbogendoerfer@suse.de>
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*
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* based on code Copyright (C) 2005 Stanislaw Skowronek <skylark@unaligned.org>
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* Copyright (C) 2014 Joshua Kinard <kumba@gentoo.org>
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include "8250.h"
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#define IOC3_UARTCLK (22000000 / 3)
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struct ioc3_8250_data {
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int line;
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};
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static unsigned int ioc3_serial_in(struct uart_port *p, int offset)
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{
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return readb(p->membase + (offset ^ 3));
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}
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static void ioc3_serial_out(struct uart_port *p, int offset, int value)
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{
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writeb(value, p->membase + (offset ^ 3));
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}
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static int serial8250_ioc3_probe(struct platform_device *pdev)
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{
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struct ioc3_8250_data *data;
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struct uart_8250_port up;
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struct resource *r;
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void __iomem *membase;
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int irq, line;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r)
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return -ENODEV;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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membase = devm_ioremap(&pdev->dev, r->start, resource_size(r));
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if (!membase)
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return -ENOMEM;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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irq = 0; /* no interrupt -> use polling */
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/* Register serial ports with 8250.c */
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memset(&up, 0, sizeof(struct uart_8250_port));
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up.port.iotype = UPIO_MEM;
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up.port.uartclk = IOC3_UARTCLK;
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up.port.type = PORT_16550A;
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up.port.irq = irq;
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up.port.flags = (UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ);
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up.port.dev = &pdev->dev;
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up.port.membase = membase;
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up.port.mapbase = r->start;
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up.port.serial_in = ioc3_serial_in;
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up.port.serial_out = ioc3_serial_out;
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line = serial8250_register_8250_port(&up);
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if (line < 0)
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return line;
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platform_set_drvdata(pdev, data);
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return 0;
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}
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static int serial8250_ioc3_remove(struct platform_device *pdev)
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{
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struct ioc3_8250_data *data = platform_get_drvdata(pdev);
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serial8250_unregister_port(data->line);
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return 0;
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}
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static struct platform_driver serial8250_ioc3_driver = {
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.probe = serial8250_ioc3_probe,
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.remove = serial8250_ioc3_remove,
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.driver = {
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.name = "ioc3-serial8250",
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}
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};
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module_platform_driver(serial8250_ioc3_driver);
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MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
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MODULE_DESCRIPTION("SGI IOC3 8250 UART driver");
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MODULE_LICENSE("GPL");
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