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sh: allow earlyprintk baud rate to be set via command line

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This allows the baud rate for earlyprintk for sh4 without the
standard BIOS to be set via the command line. This uses the same
format as i386 and x86_64, which is:

	earlyprintk=serial,ttySC1,38400

The second parameter (ttySC1 above) is usually the console device
name or the io address of the serial port. I allow that to be
specified but ignore it in order to keep the format the same as
i386/x86_64.

Signed-off-by: Jamie Lenehan <lenehan@twibble.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Jamie Lenehan 2006-12-19 12:16:06 +09:00 committed by Paul Mundt
parent 106dac130d
commit 703404ea44
1 changed files with 22 additions and 2 deletions
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24
arch/sh/kernel/early_printk.c
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@ -106,12 +106,32 @@ static struct console scif_console = {
};
#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_STANDARD_BIOS)
#define DEFAULT_BAUD 115200
/*
* Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
* devices that aren't using sh-ipl+g.
*/
static void scif_sercon_init(int baud)
static void scif_sercon_init(char *s)
{
unsigned baud = DEFAULT_BAUD;
char *e;
if (*s == ',')
++s;
if (*s) {
/* ignore ioport/device name */
s += strcspn(s, ",");
if (*s == ',')
s++;
}
if (*s) {
baud = simple_strtoul(s, &e, 0);
if (baud == 0 || s == e)
baud = DEFAULT_BAUD;
}
ctrl_outw(0, scif_port.mapbase + 8);
ctrl_outw(0, scif_port.mapbase);
@ -167,7 +187,7 @@ int __init setup_early_printk(char *buf)
early_console = &scif_console;
#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_STANDARD_BIOS)
scif_sercon_init(115200);
scif_sercon_init(buf + 6);
#endif
}
#endif