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[POWERPC] Autodetect serial console on efika 

Efika boards have to be booted with console=ttyPSC0 unless there is a
graphics card plugged in. Detect if the firmware stdout is the serial
connector.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olaf Hering 2007-03-31 17:08:23 +02:00 committed by Paul Mackerras
parent 02cc51149f
commit 9414715a7b
1 changed files with 26 additions and 0 deletions
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26
arch/powerpc/platforms/52xx/efika.c
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@ -21,6 +21,7 @@
#include <linux/initrd.h>
#include <linux/timer.h>
#include <linux/pci.h>
#include <linux/console.h>
#include <asm/io.h>
#include <asm/irq.h>
@ -221,12 +222,37 @@ static int __init efika_probe(void)
return 1;
}
static void __init efika_init_early(void)
{
#ifdef CONFIG_SERIAL_MPC52xx
struct device_node *stdout_node;
const char *device_type;
if (strstr(cmd_line, "console="))
return;
/* find the boot console from /chosen/stdout */
if (!of_chosen)
return;
device_type = get_property(of_chosen, "linux,stdout-path", NULL);
if (!device_type)
return;
stdout_node = of_find_node_by_path(device_type);
if (stdout_node) {
device_type = get_property(stdout_node, "device_type", NULL);
if (device_type && strcmp(device_type, "serial") == 0)
add_preferred_console("ttyPSC", 0, NULL);
of_node_put(stdout_node);
}
#endif
}
define_machine(efika)
{
.name = EFIKA_PLATFORM_NAME,
.probe = efika_probe,
.setup_arch = efika_setup_arch,
.init = mpc52xx_declare_of_platform_devices,
.init_early = efika_init_early,
.show_cpuinfo = efika_show_cpuinfo,
.init_IRQ = mpc52xx_init_irq,
.get_irq = mpc52xx_get_irq,