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98 lines
2.3 KiB
98 lines
2.3 KiB
// 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 <[email protected]> |
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* |
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* based on code Copyright (C) 2005 Stanislaw Skowronek <[email protected]> |
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* Copyright (C) 2014 Joshua Kinard <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("SGI IOC3 8250 UART driver"); |
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MODULE_LICENSE("GPL");
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