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/*
* Copyright (C) 2025 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <string.h>
#include <ipxe/serial.h>
#include <ipxe/devtree.h>
#include <ipxe/fdt.h>
/** @file
*
* Flattened Device Tree serial console
*
*/
#ifdef SERIAL_FDT
#define SERIAL_PREFIX_fdt
#else
#define SERIAL_PREFIX_fdt __fdt_
#endif
/** FDT console parent device */
static struct device fdtcon_parent = {
.name = "fdtcon",
.siblings = LIST_HEAD_INIT ( fdtcon_parent.siblings ),
.children = LIST_HEAD_INIT ( fdtcon_parent.children ),
};
/** Colour for debug messages */
#define colour &fdtcon_parent
/**
* Identify default serial console
*
* @ret uart Default serial console UART, or NULL
*/
static struct uart * fdtcon_default ( void ) {
unsigned int chosen;
unsigned int stdout;
const char *path;
struct uart *prev;
struct uart *uart;
int rc;
/* Record existing UART, if any */
prev = list_last_entry ( &uarts, struct uart, list );
/* Locate "/chosen" node */
if ( ( rc = fdt_path ( &sysfdt, "/chosen", &chosen ) ) != 0 ) {
DBGC ( colour, "FDTCON could not locate \"/chosen\": %s\n",
strerror ( rc ) );
return NULL;
}
/* Get console device path (or alias) */
path = fdt_string ( &sysfdt, chosen, "stdout-path" );
if ( ! path ) {
DBGC ( colour, "FDTCON has no console device\n" );
return NULL;
}
DBGC ( colour, "FDTCON console device is \"%s\"\n", path );
/* Locate device */
if ( ( ( rc = fdt_path ( &sysfdt, path, &stdout ) ) != 0 ) &&
( ( rc = fdt_alias ( &sysfdt, path, &stdout ) ) != 0 ) ) {
DBGC ( colour, "FDTCON could not locate \"/%s\": %s\n",
path, strerror ( rc ) );
return NULL;
}
/* Probe device */
if ( ( rc = dt_probe_node ( &fdtcon_parent, stdout ) ) != 0 ) {
DBGC ( colour, "FDTCON could not probe \"%s\": %s\n",
path, strerror ( rc ) );
return NULL;
}
/* Use newly added UART, if any */
uart = list_last_entry ( &uarts, struct uart, list );
if ( uart == prev )
return NULL;
DBGC ( colour, "FDTCON using UART %s\n", uart->name );
return uart;
}
PROVIDE_SERIAL ( fdt, default_serial_console, fdtcon_default );
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