2005-04-17 05:20:36 +07:00
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/*
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* linux/include/linux/serial_8250.h
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*
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* Copyright (C) 2004 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef _LINUX_SERIAL_8250_H
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#define _LINUX_SERIAL_8250_H
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#include <linux/serial_core.h>
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2005-10-30 01:07:23 +07:00
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#include <linux/platform_device.h>
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2005-04-17 05:20:36 +07:00
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2005-09-01 21:56:26 +07:00
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/*
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* This is the platform device platform_data structure
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*/
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2005-04-17 05:20:36 +07:00
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struct plat_serial8250_port {
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unsigned long iobase; /* io base address */
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void __iomem *membase; /* ioremap cookie or NULL */
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unsigned long mapbase; /* resource base */
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unsigned int irq; /* interrupt number */
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unsigned int uartclk; /* UART clock rate */
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unsigned char regshift; /* register shift */
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unsigned char iotype; /* UPIO_* */
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2005-06-27 17:12:54 +07:00
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unsigned char hub6;
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2006-01-22 06:03:28 +07:00
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upf_t flags; /* UPF_* flags */
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2005-04-17 05:20:36 +07:00
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};
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2005-09-08 22:04:41 +07:00
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/*
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* Allocate 8250 platform device IDs. Nothing is implied by
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* the numbering here, except for the legacy entry being -1.
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*/
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enum {
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PLAT8250_DEV_LEGACY = -1,
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PLAT8250_DEV_PLATFORM,
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PLAT8250_DEV_PLATFORM1,
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2006-03-26 06:03:13 +07:00
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PLAT8250_DEV_PLATFORM2,
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2005-09-08 22:04:41 +07:00
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PLAT8250_DEV_FOURPORT,
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PLAT8250_DEV_ACCENT,
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PLAT8250_DEV_BOCA,
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2006-12-07 11:37:03 +07:00
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PLAT8250_DEV_EXAR_ST16C554,
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2005-09-08 22:04:41 +07:00
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PLAT8250_DEV_HUB6,
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PLAT8250_DEV_MCA,
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2005-11-06 16:07:03 +07:00
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PLAT8250_DEV_AU1X00,
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2005-09-08 22:04:41 +07:00
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};
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2005-09-01 21:56:26 +07:00
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/*
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* This should be used by drivers which want to register
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* their own 8250 ports without registering their own
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* platform device. Using these will make your driver
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* dependent on the 8250 driver.
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*/
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struct uart_port;
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int serial8250_register_port(struct uart_port *);
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void serial8250_unregister_port(int line);
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void serial8250_suspend_port(int line);
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void serial8250_resume_port(int line);
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2007-07-18 14:49:10 +07:00
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extern int early_serial_setup(struct uart_port *port);
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serial: convert early_uart to earlycon for 8250
Beacuse SERIAL_PORT_DFNS is removed from include/asm-i386/serial.h and
include/asm-x86_64/serial.h. the serial8250_ports need to be probed late in
serial initializing stage. the console_init=>serial8250_console_init=>
register_console=>serial8250_console_setup will return -ENDEV, and console
ttyS0 can not be enabled at that time. need to wait till uart_add_one_port in
drivers/serial/serial_core.c to call register_console to get console ttyS0.
that is too late.
Make early_uart to use early_param, so uart console can be used earlier. Make
it to be bootconsole with CON_BOOT flag, so can use console handover feature.
and it will switch to corresponding normal serial console automatically.
new command line will be:
console=uart8250,io,0x3f8,9600n8
console=uart8250,mmio,0xff5e0000,115200n8
or
earlycon=uart8250,io,0x3f8,9600n8
earlycon=uart8250,mmio,0xff5e0000,115200n8
it will print in very early stage:
Early serial console at I/O port 0x3f8 (options '9600n8')
console [uart0] enabled
later for console it will print:
console handover: boot [uart0] -> real [ttyS0]
Signed-off-by: <yinghai.lu@sun.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Gerd Hoffmann <kraxel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-16 13:37:59 +07:00
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extern int serial8250_find_port(struct uart_port *p);
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extern int serial8250_find_port_for_earlycon(void);
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extern int setup_early_serial8250_console(char *cmdline);
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2005-04-17 05:20:36 +07:00
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#endif
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