134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/*
|
|
* IBM RTAS driver interface to hvc_console.c
|
|
*
|
|
* (C) Copyright IBM Corporation 2001-2005
|
|
* (C) Copyright Red Hat, Inc. 2005
|
|
*
|
|
* Author(s): Maximino Augilar <IBM STI Design Center>
|
|
* : Ryan S. Arnold <rsa@us.ibm.com>
|
|
* : Utz Bacher <utz.bacher@de.ibm.com>
|
|
* : David Woodhouse <dwmw2@infradead.org>
|
|
*
|
|
* inspired by drivers/char/hvc_console.c
|
|
* written by Anton Blanchard and Paul Mackerras
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/console.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/irq.h>
|
|
#include <asm/rtas.h>
|
|
#include "hvc_console.h"
|
|
|
|
#define hvc_rtas_cookie 0x67781e15
|
|
struct hvc_struct *hvc_rtas_dev;
|
|
|
|
static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
|
|
static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
|
|
|
|
static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf,
|
|
int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i]))
|
|
break;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
|
|
{
|
|
int i, c;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (rtas_call(rtascons_get_char_token, 0, 2, &c))
|
|
break;
|
|
|
|
buf[i] = c;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
static struct hv_ops hvc_rtas_get_put_ops = {
|
|
.get_chars = hvc_rtas_read_console,
|
|
.put_chars = hvc_rtas_write_console,
|
|
};
|
|
|
|
static int hvc_rtas_init(void)
|
|
{
|
|
struct hvc_struct *hp;
|
|
|
|
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
|
|
rtascons_put_char_token = rtas_token("put-term-char");
|
|
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
|
|
return -EIO;
|
|
|
|
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
|
|
rtascons_get_char_token = rtas_token("get-term-char");
|
|
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
|
|
return -EIO;
|
|
|
|
BUG_ON(hvc_rtas_dev);
|
|
|
|
/* Allocate an hvc_struct for the console device we instantiated
|
|
* earlier. Save off hp so that we can return it on exit */
|
|
hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops);
|
|
if (IS_ERR(hp))
|
|
return PTR_ERR(hp);
|
|
|
|
hvc_rtas_dev = hp;
|
|
|
|
return 0;
|
|
}
|
|
module_init(hvc_rtas_init);
|
|
|
|
/* This will tear down the tty portion of the driver */
|
|
static void __exit hvc_rtas_exit(void)
|
|
{
|
|
/* Really the fun isn't over until the worker thread breaks down and
|
|
* the tty cleans up */
|
|
if (hvc_rtas_dev)
|
|
hvc_remove(hvc_rtas_dev);
|
|
}
|
|
module_exit(hvc_rtas_exit);
|
|
|
|
/* This will happen prior to module init. There is no tty at this time? */
|
|
static int hvc_rtas_console_init(void)
|
|
{
|
|
rtascons_put_char_token = rtas_token("put-term-char");
|
|
if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
|
|
return -EIO;
|
|
|
|
rtascons_get_char_token = rtas_token("get-term-char");
|
|
if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
|
|
return -EIO;
|
|
|
|
hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops);
|
|
add_preferred_console("hvc", 0, NULL);
|
|
|
|
return 0;
|
|
}
|
|
console_initcall(hvc_rtas_console_init);
|