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/*
* xen/drivers/char/dt-uart.c
*
* Generic uart retrieved via the device tree
*
* Julien Grall <julien.grall@linaro.org>
* Copyright (c) 2013 Linaro Limited.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <asm/device.h>
#include <asm/early_printk.h>
#include <asm/types.h>
#include <xen/console.h>
#include <xen/device_tree.h>
#include <xen/serial.h>
/*
* Configure UART port with a string:
* path,options
*
* @path: full path used in the device tree for the UART. If the path
* doesn't start with '/', we assuming that it's an alias.
* @options: UART speficic options (see in each UART driver)
*/
static char __initdata opt_dtuart[30] = "";
string_param("dtuart", opt_dtuart);
void __init dt_uart_init(void)
{
struct dt_device_node *dev;
int ret;
const char *devpath = opt_dtuart;
char *options;
if ( !console_has("dtuart") || !strcmp(opt_dtuart, "") )
{
early_printk("No console\n");
return;
}
options = strchr(opt_dtuart, ',');
if ( options != NULL )
*(options++) = '\0';
else
options = "";
early_printk("Looking for UART console %s\n", devpath);
if ( *devpath == '/' )
dev = dt_find_node_by_path(devpath);
else
dev = dt_find_node_by_alias(devpath);
if ( !dev )
{
early_printk("Unable to find device \"%s\"\n", devpath);
return;
}
ret = device_init(dev, DEVICE_SERIAL, options);
if ( ret )
early_printk("Unable to initialize serial: %d\n", ret);
}
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