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/*
* arch/h8300/kernel/early_printk.c
*
* Copyright (C) 2009 Yoshinori Sato <ysato@users.sourceforge.jp>
*
* 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 <linux/io.h>
#include <linux/platform_device.h>
static void sim_write(struct console *co, const char *ptr,
unsigned len)
{
register const int fd __asm__("er0") = 1; /* stdout */
register const char *_ptr __asm__("er1") = ptr;
register const unsigned _len __asm__("er2") = len;
__asm__(".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */
: : "g"(fd), "g"(_ptr), "g"(_len));
}
static struct console sim_console = {
.name = "sim_console",
.write = sim_write,
.setup = NULL,
.flags = CON_PRINTBUFFER,
.index = -1,
};
static char sim_console_buf[32];
static int sim_probe(struct platform_device *pdev)
{
if (sim_console.data)
return -EEXIST;
if (!strstr(sim_console_buf, "keep"))
sim_console.flags |= CON_BOOT;
register_console(&sim_console);
return 0;
}
static int sim_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver sim_driver = {
.probe = sim_probe,
.remove = sim_remove,
.driver = {
.name = "h8300-sim",
.owner = THIS_MODULE,
},
};
early_platform_init_buffer("earlyprintk", &sim_driver,
sim_console_buf, ARRAY_SIZE(sim_console_buf));
static struct platform_device sim_console_device = {
.name = "h8300-sim",
.id = 0,
};
static struct platform_device *devices[] __initdata = {
&sim_console_device,
};
void __init sim_console_register(void)
{
early_platform_add_devices(devices,
ARRAY_SIZE(devices));
}
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