[linux-2.6-block.git] / drivers / tty / hvc / hvc_rtas.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * 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 const struct hv_ops hvc_rtas_get_put_ops = {
	.get_chars = hvc_rtas_read_console,
	.put_chars = hvc_rtas_write_console,
};

static int __init 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, 0, &hvc_rtas_get_put_ops, 16);
	if (IS_ERR(hp))
		return PTR_ERR(hp);

	hvc_rtas_dev = hp;

	return 0;
}
device_initcall(hvc_rtas_init);

/* This will happen prior to module init.  There is no tty at this time? */
static int __init 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);
Commit	Line	Data
e3b3d0f5	1	// SPDX-License-Identifier: GPL-2.0+
f4d1749e AB	2	/*
	3	* IBM RTAS driver interface to hvc_console.c
	4	*
	5	* (C) Copyright IBM Corporation 2001-2005
	6	* (C) Copyright Red Hat, Inc. 2005
	7	*
	8	* Author(s): Maximino Augilar <IBM STI Design Center>
	9	* : Ryan S. Arnold <rsa@us.ibm.com>
	10	* : Utz Bacher <utz.bacher@de.ibm.com>
	11	* : David Woodhouse <dwmw2@infradead.org>
	12	*
	13	* inspired by drivers/char/hvc_console.c
	14	* written by Anton Blanchard and Paul Mackerras
	15	*
	16	* This program is free software; you can redistribute it and/or modify
	17	* it under the terms of the GNU General Public License as published by
	18	* the Free Software Foundation; either version 2 of the License, or
	19	* (at your option) any later version.
	20	*
	21	* This program is distributed in the hope that it will be useful,
	22	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	23	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	24	* GNU General Public License for more details.
	25	*
	26	* You should have received a copy of the GNU General Public License
	27	* along with this program; if not, write to the Free Software
	28	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	29	*/
	30
	31	#include <linux/console.h>
	32	#include <linux/delay.h>
	33	#include <linux/err.h>
	34	#include <linux/init.h>
	35	#include <linux/moduleparam.h>
	36	#include <linux/types.h>
	37
	38	#include <asm/irq.h>
	39	#include <asm/rtas.h>
	40	#include "hvc_console.h"
	41
	42	#define hvc_rtas_cookie 0x67781e15
	43	struct hvc_struct *hvc_rtas_dev;
	44
f4d1749e AB	45	static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
f4d1749e AB	46	static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
f4d1749e	47
6b81e800 ME	48	static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf,
6b81e800 ME	49	int count)
f4d1749e	50	{
6b81e800	51	int i;
f4d1749e	52
6b81e800 ME	53	for (i = 0; i < count; i++) {
6b81e800 ME	54	if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i]))
f4d1749e AB	55	break;
f4d1749e AB	56	}
6b81e800 ME	57
6b81e800 ME	58	return i;
f4d1749e AB	59	}
	60
	61	static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
	62	{
6b81e800	63	int i, c;
f4d1749e AB	64
f4d1749e AB	65	for (i = 0; i < count; i++) {
6b81e800	66	if (rtas_call(rtascons_get_char_token, 0, 2, &c))
f4d1749e AB	67	break;
	68
	69	buf[i] = c;
	70	}
	71
	72	return i;
	73	}
	74
1dff3996	75	static const struct hv_ops hvc_rtas_get_put_ops = {
f4d1749e AB	76	.get_chars = hvc_rtas_read_console,
	77	.put_chars = hvc_rtas_write_console,
	78	};
	79
1407b3d1	80	static int __init hvc_rtas_init(void)
f4d1749e AB	81	{
	82	struct hvc_struct *hp;
	83
	84	if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
	85	rtascons_put_char_token = rtas_token("put-term-char");
	86	if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
	87	return -EIO;
	88
	89	if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
	90	rtascons_get_char_token = rtas_token("get-term-char");
	91	if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
	92	return -EIO;
	93
	94	BUG_ON(hvc_rtas_dev);
	95
	96	/* Allocate an hvc_struct for the console device we instantiated
	97	* earlier. Save off hp so that we can return it on exit */
d4e33fac	98	hp = hvc_alloc(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops, 16);
f4d1749e AB	99	if (IS_ERR(hp))
f4d1749e AB	100	return PTR_ERR(hp);
6b81e800	101
f4d1749e	102	hvc_rtas_dev = hp;
6b81e800	103
f4d1749e AB	104	return 0;
f4d1749e AB	105	}
4fedd0bf	106	device_initcall(hvc_rtas_init);
f4d1749e AB	107
f4d1749e AB	108	/* This will happen prior to module init. There is no tty at this time? */
a6dfe1dc	109	static int __init hvc_rtas_console_init(void)
f4d1749e AB	110	{
	111	rtascons_put_char_token = rtas_token("put-term-char");
	112	if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
	113	return -EIO;
6b81e800	114
f4d1749e AB	115	rtascons_get_char_token = rtas_token("get-term-char");
	116	if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
	117	return -EIO;
	118
6b81e800	119	hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops);
f4d1749e	120	add_preferred_console("hvc", 0, NULL);
6b81e800	121
f4d1749e AB	122	return 0;
	123	}
	124	console_initcall(hvc_rtas_console_init);