[net-next-2.6.git] / drivers / char / hvc_udbg.c

/*
 * udbg interface to hvc_console.c
 *
 * (C) Copyright David Gibson, IBM Corporation 2008.
 *
 * 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 <linux/irq.h>

#include <asm/udbg.h>

#include "hvc_console.h"

struct hvc_struct *hvc_udbg_dev;

static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
{
	int i;

	for (i = 0; i < count; i++)
		udbg_putc(buf[i]);

	return i;
}

static int hvc_udbg_get(uint32_t vtermno, char *buf, int count)
{
	int i, c;

	if (!udbg_getc_poll)
		return 0;

	for (i = 0; i < count; i++) {
		if ((c = udbg_getc_poll()) == -1)
			break;
		buf[i] = c;
	}

	return i;
}

static const struct hv_ops hvc_udbg_ops = {
	.get_chars = hvc_udbg_get,
	.put_chars = hvc_udbg_put,
};

static int __init hvc_udbg_init(void)
{
	struct hvc_struct *hp;

	BUG_ON(hvc_udbg_dev);

	hp = hvc_alloc(0, NO_IRQ, &hvc_udbg_ops, 16);
	if (IS_ERR(hp))
		return PTR_ERR(hp);

	hvc_udbg_dev = hp;

	return 0;
}
module_init(hvc_udbg_init);

static void __exit hvc_udbg_exit(void)
{
	if (hvc_udbg_dev)
		hvc_remove(hvc_udbg_dev);
}
module_exit(hvc_udbg_exit);

static int __init hvc_udbg_console_init(void)
{
	hvc_instantiate(0, 0, &hvc_udbg_ops);
	add_preferred_console("hvc", 0, NULL);

	return 0;
}
console_initcall(hvc_udbg_console_init);
Commit	Line	Data
d5e54913 DG	1	/*
	2	* udbg interface to hvc_console.c
	3	*
	4	* (C) Copyright David Gibson, IBM Corporation 2008.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/console.h>
	22	#include <linux/delay.h>
	23	#include <linux/err.h>
	24	#include <linux/init.h>
	25	#include <linux/moduleparam.h>
	26	#include <linux/types.h>
	27	#include <linux/irq.h>
	28
	29	#include <asm/udbg.h>
	30
	31	#include "hvc_console.h"
	32
	33	struct hvc_struct *hvc_udbg_dev;
	34
	35	static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
	36	{
	37	int i;
	38
	39	for (i = 0; i < count; i++)
	40	udbg_putc(buf[i]);
	41
	42	return i;
	43	}
	44
	45	static int hvc_udbg_get(uint32_t vtermno, char *buf, int count)
	46	{
	47	int i, c;
	48
	49	if (!udbg_getc_poll)
	50	return 0;
	51
	52	for (i = 0; i < count; i++) {
	53	if ((c = udbg_getc_poll()) == -1)
	54	break;
	55	buf[i] = c;
	56	}
	57
	58	return i;
	59	}
	60
1dff3996	61	static const struct hv_ops hvc_udbg_ops = {
d5e54913 DG	62	.get_chars = hvc_udbg_get,
	63	.put_chars = hvc_udbg_put,
	64	};
	65
	66	static int __init hvc_udbg_init(void)
	67	{
	68	struct hvc_struct *hp;
	69
	70	BUG_ON(hvc_udbg_dev);
	71
	72	hp = hvc_alloc(0, NO_IRQ, &hvc_udbg_ops, 16);
	73	if (IS_ERR(hp))
	74	return PTR_ERR(hp);
	75
	76	hvc_udbg_dev = hp;
	77
	78	return 0;
	79	}
	80	module_init(hvc_udbg_init);
	81
	82	static void __exit hvc_udbg_exit(void)
	83	{
	84	if (hvc_udbg_dev)
	85	hvc_remove(hvc_udbg_dev);
	86	}
	87	module_exit(hvc_udbg_exit);
	88
	89	static int __init hvc_udbg_console_init(void)
	90	{
	91	hvc_instantiate(0, 0, &hvc_udbg_ops);
	92	add_preferred_console("hvc", 0, NULL);
	93
	94	return 0;
	95	}
	96	console_initcall(hvc_udbg_console_init);