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/*
* 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;
#define RTASCONS_PUT_ATTEMPTS 16
static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
static int rtascons_put_delay = 100;
module_param_named(put_delay, rtascons_put_delay, int, 0644);
static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf, int count)
{
int done;
/* if there is more than one character to be displayed, wait a bit */
for (done = 0; done < count; done++) {
int result;
result = rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[done]);
if (result)
break;
}
/* the calling routine expects to receive the number of bytes sent */
return done;
}
static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
{
int i;
for (i = 0; i < count; i++) {
int c, err;
err = rtas_call(rtascons_get_char_token, 0, 2, &c);
if (err)
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);
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