Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / arch / i386 / kernel / legacy_serial.c
1 /*
2  * Legacy COM port devices for x86 platforms without PNPBIOS or ACPI.
3  * Data taken from include/asm-i386/serial.h.
4  *
5  * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
6  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/pnp.h>
15 #include <linux/serial_8250.h>
16
17 /* Standard COM flags (except for COM4, because of the 8514 problem) */
18 #ifdef CONFIG_SERIAL_DETECT_IRQ
19 #define COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_AUTO_IRQ)
20 #define COM4_FLAGS (UPF_BOOT_AUTOCONF | UPF_AUTO_IRQ)
21 #else
22 #define COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST)
23 #define COM4_FLAGS UPF_BOOT_AUTOCONF
24 #endif
25
26 #define PORT(_base,_irq,_flags)                         \
27         {                                               \
28                 .iobase         = _base,                \
29                 .irq            = _irq,                 \
30                 .uartclk        = 1843200,              \
31                 .iotype         = UPIO_PORT,            \
32                 .flags          = _flags,               \
33         }
34
35 static struct plat_serial8250_port x86_com_data[] = {
36         PORT(0x3F8, 4, COM_FLAGS),
37         PORT(0x2F8, 3, COM_FLAGS),
38         PORT(0x3E8, 4, COM_FLAGS),
39         PORT(0x2E8, 3, COM4_FLAGS),
40         { },
41 };
42
43 static struct platform_device x86_com_device = {
44         .name                   = "serial8250",
45         .id                     = PLAT8250_DEV_PLATFORM,
46         .dev                    = {
47                 .platform_data  = x86_com_data,
48         },
49 };
50
51 static int force_legacy_probe;
52 module_param_named(force, force_legacy_probe, bool, 0);
53 MODULE_PARM_DESC(force, "Force legacy serial port probe");
54
55 static int __init serial8250_x86_com_init(void)
56 {
57         if (pnp_platform_devices && !force_legacy_probe)
58                 return -ENODEV;
59
60         return platform_device_register(&x86_com_device);
61 }
62
63 module_init(serial8250_x86_com_init);
64
65 MODULE_AUTHOR("Bjorn Helgaas");
66 MODULE_LICENSE("GPL");
67 MODULE_DESCRIPTION("Generic 8250/16x50 legacy probe module");