mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-11 21:14:07 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
/*
|
|
* arch/sh/kernel/early_printk.c
|
|
*
|
|
* Copyright (C) 1999, 2000 Niibe Yutaka
|
|
* Copyright (C) 2002 M. R. Brown
|
|
* Copyright (C) 2004 Paul Mundt
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#include <linux/console.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/init.h>
|
|
#include <asm/io.h>
|
|
|
|
#ifdef CONFIG_SH_STANDARD_BIOS
|
|
#include <asm/sh_bios.h>
|
|
|
|
/*
|
|
* Print a string through the BIOS
|
|
*/
|
|
static void sh_console_write(struct console *co, const char *s,
|
|
unsigned count)
|
|
{
|
|
sh_bios_console_write(s, count);
|
|
}
|
|
|
|
/*
|
|
* Setup initial baud/bits/parity. We do two things here:
|
|
* - construct a cflag setting for the first rs_open()
|
|
* - initialize the serial port
|
|
* Return non-zero if we didn't find a serial port.
|
|
*/
|
|
static int __init sh_console_setup(struct console *co, char *options)
|
|
{
|
|
int cflag = CREAD | HUPCL | CLOCAL;
|
|
|
|
/*
|
|
* Now construct a cflag setting.
|
|
* TODO: this is a totally bogus cflag, as we have
|
|
* no idea what serial settings the BIOS is using, or
|
|
* even if its using the serial port at all.
|
|
*/
|
|
cflag |= B115200 | CS8 | /*no parity*/0;
|
|
|
|
co->cflag = cflag;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct console early_console = {
|
|
.name = "bios",
|
|
.write = sh_console_write,
|
|
.setup = sh_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_EARLY_SCIF_CONSOLE
|
|
#define SCIF_REG 0xffe80000
|
|
|
|
static void scif_sercon_putc(int c)
|
|
{
|
|
while (!(ctrl_inw(SCIF_REG + 0x10) & 0x20)) ;
|
|
|
|
ctrl_outb(c, SCIF_REG + 12);
|
|
ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0x9f), SCIF_REG + 0x10);
|
|
|
|
if (c == '\n')
|
|
scif_sercon_putc('\r');
|
|
}
|
|
|
|
static void scif_sercon_flush(void)
|
|
{
|
|
ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0xbf), SCIF_REG + 0x10);
|
|
|
|
while (!(ctrl_inw(SCIF_REG + 0x10) & 0x40)) ;
|
|
|
|
ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0xbf), SCIF_REG + 0x10);
|
|
}
|
|
|
|
static void scif_sercon_write(struct console *con, const char *s, unsigned count)
|
|
{
|
|
while (count-- > 0)
|
|
scif_sercon_putc(*s++);
|
|
|
|
scif_sercon_flush();
|
|
}
|
|
|
|
static int __init scif_sercon_setup(struct console *con, char *options)
|
|
{
|
|
con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct console early_console = {
|
|
.name = "sercon",
|
|
.write = scif_sercon_write,
|
|
.setup = scif_sercon_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
void scif_sercon_init(int baud)
|
|
{
|
|
ctrl_outw(0, SCIF_REG + 8);
|
|
ctrl_outw(0, SCIF_REG);
|
|
|
|
/* Set baud rate */
|
|
ctrl_outb((CONFIG_SH_PCLK_FREQ + 16 * baud) /
|
|
(32 * baud) - 1, SCIF_REG + 4);
|
|
|
|
ctrl_outw(12, SCIF_REG + 24);
|
|
ctrl_outw(8, SCIF_REG + 24);
|
|
ctrl_outw(0, SCIF_REG + 32);
|
|
ctrl_outw(0x60, SCIF_REG + 16);
|
|
ctrl_outw(0, SCIF_REG + 36);
|
|
ctrl_outw(0x30, SCIF_REG + 8);
|
|
}
|
|
#endif
|
|
|
|
void __init enable_early_printk(void)
|
|
{
|
|
#ifdef CONFIG_EARLY_SCIF_CONSOLE
|
|
scif_sercon_init(115200);
|
|
#endif
|
|
register_console(&early_console);
|
|
}
|
|
|
|
void disable_early_printk(void)
|
|
{
|
|
unregister_console(&early_console);
|
|
}
|
|
|