forked from Minki/linux
1558f9b44e
Current of_serial driver assumes unknown serial port to be 8250. But this behavior may cause fatal problems when the serial port is not 8250. This corrects probe routine to ignore unknown serial port. Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/*
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* Serial Port driver for Open Firmware platform devices
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*
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* Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/serial_core.h>
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#include <linux/serial_8250.h>
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#include <asm/of_platform.h>
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#include <asm/prom.h>
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/*
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* Fill a struct uart_port for a given device node
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*/
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static int __devinit of_platform_serial_setup(struct of_device *ofdev,
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int type, struct uart_port *port)
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{
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struct resource resource;
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struct device_node *np = ofdev->node;
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const unsigned int *clk, *spd;
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int ret;
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memset(port, 0, sizeof *port);
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spd = of_get_property(np, "current-speed", NULL);
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clk = of_get_property(np, "clock-frequency", NULL);
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if (!clk) {
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dev_warn(&ofdev->dev, "no clock-frequency property set\n");
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return -ENODEV;
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}
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ret = of_address_to_resource(np, 0, &resource);
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if (ret) {
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dev_warn(&ofdev->dev, "invalid address\n");
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return ret;
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}
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spin_lock_init(&port->lock);
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port->mapbase = resource.start;
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port->irq = irq_of_parse_and_map(np, 0);
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port->iotype = UPIO_MEM;
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port->type = type;
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port->uartclk = *clk;
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port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
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| UPF_FIXED_PORT;
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port->dev = &ofdev->dev;
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port->custom_divisor = *clk / (16 * (*spd));
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return 0;
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}
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/*
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* Try to register a serial port
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*/
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static int __devinit of_platform_serial_probe(struct of_device *ofdev,
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const struct of_device_id *id)
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{
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struct uart_port port;
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int port_type;
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int ret;
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if (of_find_property(ofdev->node, "used-by-rtas", NULL))
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return -EBUSY;
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port_type = (unsigned long)id->data;
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ret = of_platform_serial_setup(ofdev, port_type, &port);
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if (ret)
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goto out;
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switch (port_type) {
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case PORT_8250 ... PORT_MAX_8250:
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ret = serial8250_register_port(&port);
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break;
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default:
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/* need to add code for these */
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case PORT_UNKNOWN:
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dev_info(&ofdev->dev, "Unknown serial port found, ignored\n");
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ret = -ENODEV;
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break;
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}
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if (ret < 0)
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goto out;
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ofdev->dev.driver_data = (void *)(unsigned long)ret;
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return 0;
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out:
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irq_dispose_mapping(port.irq);
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return ret;
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}
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/*
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* Release a line
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*/
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static int of_platform_serial_remove(struct of_device *ofdev)
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{
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int line = (unsigned long)ofdev->dev.driver_data;
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serial8250_unregister_port(line);
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return 0;
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}
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/*
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* A few common types, add more as needed.
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*/
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static struct of_device_id __devinitdata of_platform_serial_table[] = {
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{ .type = "serial", .compatible = "ns8250", .data = (void *)PORT_8250, },
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{ .type = "serial", .compatible = "ns16450", .data = (void *)PORT_16450, },
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{ .type = "serial", .compatible = "ns16550", .data = (void *)PORT_16550, },
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{ .type = "serial", .compatible = "ns16750", .data = (void *)PORT_16750, },
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{ .type = "serial", .data = (void *)PORT_UNKNOWN, },
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{ /* end of list */ },
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};
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static struct of_platform_driver __devinitdata of_platform_serial_driver = {
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.owner = THIS_MODULE,
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.name = "of_serial",
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.probe = of_platform_serial_probe,
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.remove = of_platform_serial_remove,
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.match_table = of_platform_serial_table,
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};
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static int __init of_platform_serial_init(void)
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{
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return of_register_platform_driver(&of_platform_serial_driver);
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}
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module_init(of_platform_serial_init);
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static void __exit of_platform_serial_exit(void)
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{
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return of_unregister_platform_driver(&of_platform_serial_driver);
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};
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module_exit(of_platform_serial_exit);
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MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices");
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